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Index: contrib/capsicum-test/.gitignore
===================================================================
--- /dev/null
+++ contrib/capsicum-test/.gitignore
@@ -0,0 +1,19 @@
+capsicum-test
+mini-me
+mini-me.noexec
+mini-me.setuid
+mini-me.32
+mini-me.x32
+mini-me.64
+libgtest.a
+smoketest
+*.o
+libcap*.deb
+libcap*.dsc
+libcap*.tar.gz
+libcap*.changes
+casper*.deb
+casper*.dsc
+casper*.tar.gz
+casper*.changes
+libcaprights.a
\ No newline at end of file
Index: contrib/capsicum-test/CONTRIBUTING.md
===================================================================
--- /dev/null
+++ contrib/capsicum-test/CONTRIBUTING.md
@@ -0,0 +1,20 @@
+## Contributor License Agreement ##
+
+Contributions to any Google project must be accompanied by a Contributor
+License Agreement. This is not a copyright **assignment**, it simply gives
+Google permission to use and redistribute your contributions as part of the
+project.
+
+ * If you are an individual writing original source code and you're sure you
+ own the intellectual property, then you'll need to sign an [individual
+ CLA][].
+
+ * If you work for a company that wants to allow you to contribute your work,
+ then you'll need to sign a [corporate CLA][].
+
+You generally only need to submit a CLA once, so if you've already submitted
+one (even if it was for a different project), you probably don't need to do it
+again.
+
+[individual CLA]: https://developers.google.com/open-source/cla/individual
+[corporate CLA]: https://developers.google.com/open-source/cla/corporate
Index: contrib/capsicum-test/GNUmakefile
===================================================================
--- /dev/null
+++ contrib/capsicum-test/GNUmakefile
@@ -0,0 +1,78 @@
+OS:=$(shell uname)
+
+# Set ARCH to 32 or x32 for i386/x32 ABIs
+ARCH?=64
+ARCHFLAG=-m$(ARCH)
+
+ifeq ($(OS),Linux)
+PROCESSOR:=$(shell uname -p)
+
+ifneq ($(wildcard /usr/lib/$(PROCESSOR)-linux-gnu),)
+# Can use standard Debian location for static libraries.
+PLATFORM_LIBDIR=/usr/lib/$(PROCESSOR)-linux-gnu
+else
+# Attempt to determine library location from gcc configuration.
+PLATFORM_LIBDIR=$(shell gcc -v 2>&1 | grep "Configured with:" | sed 's/.*--libdir=\(\/usr\/[^ ]*\).*/\1/g')
+endif
+
+# Override for explicitly specified ARCHFLAG.
+# Use locally compiled libcaprights in this case, on the
+# assumption that any installed version is 64-bit.
+ifeq ($(ARCHFLAG),-m32)
+PROCESSOR=i386
+PLATFORM_LIBDIR=/usr/lib32
+LIBCAPRIGHTS=./libcaprights.a
+endif
+ifeq ($(ARCHFLAG),-mx32)
+PROCESSOR=x32
+PLATFORM_LIBDIR=/usr/libx32
+LIBCAPRIGHTS=./libcaprights.a
+endif
+
+# Detect presence of libsctp in normal Debian location
+ifneq ($(wildcard $(PLATFORM_LIBDIR)/libsctp.a),)
+LIBSCTP=-lsctp
+CXXFLAGS=-DHAVE_SCTP
+endif
+
+ifneq ($(LIBCAPRIGHTS),)
+# Build local libcaprights.a (assuming ./configure
+# has already been done in libcaprights/)
+LOCAL_LIBS=$(LIBCAPRIGHTS)
+LIBCAPRIGHTS_OBJS=libcaprights/capsicum.o libcaprights/linux-bpf-capmode.o libcaprights/procdesc.o libcaprights/signal.o
+LOCAL_CLEAN=$(LOCAL_LIBS) $(LIBCAPRIGHTS_OBJS)
+else
+# Detect installed libcaprights static library.
+ifneq ($(wildcard $(PLATFORM_LIBDIR)/libcaprights.a),)
+LIBCAPRIGHTS=$(PLATFORM_LIBDIR)/libcaprights.a
+else
+ifneq ($(wildcard /usr/lib/libcaprights.a),)
+LIBCAPRIGHTS=/usr/lib/libcaprights.a
+endif
+endif
+endif
+
+endif
+
+# Extra test programs for arch-transition tests
+EXTRA_PROGS = mini-me.32 mini-me.64
+ifneq ($(wildcard /usr/include/gnu/stubs-x32.h),)
+EXTRA_PROGS += mini-me.x32
+endif
+
+# Chain on to the master makefile
+include makefile
+
+./libcaprights.a: $(LIBCAPRIGHTS_OBJS)
+ ar cr $@ $^
+
+# Small static programs of known architectures
+# These may require additional packages to be installed; for example, for Debian:
+# - libc6-dev-i386 provides 32-bit headers for a 64-bit system
+# - libc6-dev-x32 provides headers for the x32 ABI.
+mini-me.32: mini-me.c
+ $(CC) $(CFLAGS) -m32 -static -o $@ $<
+mini-me.x32: mini-me.c
+ $(CC) $(CFLAGS) -mx32 -static -o $@ $<
+mini-me.64: mini-me.c
+ $(CC) $(CFLAGS) -m64 -static -o $@ $<
Index: contrib/capsicum-test/LICENSE
===================================================================
--- /dev/null
+++ contrib/capsicum-test/LICENSE
@@ -0,0 +1,26 @@
+Copyright (c) 2009-2011 Robert N. M. Watson
+Copyright (c) 2011 Jonathan Anderson
+Copyright (C) 2012 The Chromium OS Authors <chromium-os-dev@chromium.org>
+Copyright (c) 2013-2014 Google Inc.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGE.
Index: contrib/capsicum-test/README.md
===================================================================
--- /dev/null
+++ contrib/capsicum-test/README.md
@@ -0,0 +1,62 @@
+# Capsicum User Space Tests
+
+This directory holds unit tests for [Capsicum](http://www.cl.cam.ac.uk/research/security/capsicum/)
+object-capabilities. The tests exercise the syscall interface to a Capsicum-enabled operating system,
+currently either [FreeBSD >=10.x](http://www.freebsd.org) or a modified Linux kernel (the
+[capsicum-linux](http://github.com/google/capsicum-linux) project).
+
+The tests are written in C++98, and use the [Google Test](https://code.google.com/p/googletest/)
+framework, with some additions to fork off particular tests (because a process that enters capability
+mode cannot leave it again).
+
+## Provenance
+
+The original basis for these tests was:
+
+ - [unit tests](https://github.com/freebsd/freebsd/tree/master/tools/regression/security/cap_test)
+ written by Robert Watson and Jonathan Anderson for the original FreeBSD 9.x Capsicum implementation
+ - [unit tests](http://git.chromium.org/gitweb/?p=chromiumos/third_party/kernel-capsicum.git;a=tree;f=tools/testing/capsicum_tests;hb=refs/heads/capsicum) written by Meredydd Luff for the original Capsicum-Linux port.
+
+These tests were coalesced and moved into an independent repository to enable
+comparative testing across multiple OSes, and then substantially extended.
+
+## OS Configuration
+
+### Linux
+
+The following kernel configuration options are needed to run the tests:
+
+ - `CONFIG_SECURITY_CAPSICUM`: enable the Capsicum framework
+ - `CONFIG_PROCDESC`: enable Capsicum process-descriptor functionality
+ - `CONFIG_DEBUG_FS`: enable debug filesystem
+ - `CONFIG_IP_SCTP`: enable SCTP support
+
+### FreeBSD (>= 10.x)
+
+The following kernel configuration options are needed so that all tests can run:
+
+ - `options P1003_1B_MQUEUE`: Enable POSIX message queues (or `kldload mqueuefs`)
+
+## Other Dependencies
+
+### Linux
+
+The following additional development packages are needed to build the full test suite on Linux.
+
+ - `libcaprights`: See below
+ - `libcap-dev`: Provides headers for POSIX.1e capabilities.
+ - `libsctp1`: Provides SCTP library functions.
+ - `libsctp-dev`: Provides headers for SCTP library functions.
+
+
+## Linux libcaprights
+
+The Capsicum userspace library is held in the `libcaprights/` subdirectory. Ideally, this
+library should be built (with `./configure; make` or `dpkg-buildpackage -uc -us`) and
+installed (with `make install` or `dpkg -i libcaprights*.deb`) so that the tests will
+use behave like a normal Capsicum-aware application.
+
+However, if no installed copy of the library is found, the `GNUmakefile` will attempt
+to use the local `libcaprights/*.c` source; this requires `./configure` to have been
+performed in the `libcaprights` subdirectory. The local code is also used for
+cross-compiled builds of the test suite (e.g. `make ARCH=32` or `make ARCH=x32`).
Index: contrib/capsicum-test/capability-fd-pair.cc
===================================================================
--- /dev/null
+++ contrib/capsicum-test/capability-fd-pair.cc
@@ -0,0 +1,188 @@
+// Tests involving 2 capability file descriptors.
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <fcntl.h>
+
+#include "capsicum.h"
+#include "syscalls.h"
+#include "capsicum-test.h"
+
+TEST(CapabilityPair, sendfile) {
+ int in_fd = open(TmpFile("cap_sendfile_in"), O_CREAT|O_RDWR, 0644);
+ EXPECT_OK(write(in_fd, "1234", 4));
+ // Output fd for sendfile must be a stream socket in FreeBSD.
+ int sock_fds[2];
+ EXPECT_OK(socketpair(AF_UNIX, SOCK_STREAM, 0, sock_fds));
+
+ cap_rights_t r_rs;
+ cap_rights_init(&r_rs, CAP_READ, CAP_SEEK);
+ cap_rights_t r_ws;
+ cap_rights_init(&r_ws, CAP_WRITE, CAP_SEEK);
+
+ int cap_in_ro = dup(in_fd);
+ EXPECT_OK(cap_in_ro);
+ EXPECT_OK(cap_rights_limit(cap_in_ro, &r_rs));
+ int cap_in_wo = dup(in_fd);
+ EXPECT_OK(cap_in_wo);
+ EXPECT_OK(cap_rights_limit(cap_in_wo, &r_ws));
+ int cap_out_ro = dup(sock_fds[0]);
+ EXPECT_OK(cap_out_ro);
+ EXPECT_OK(cap_rights_limit(cap_out_ro, &r_rs));
+ int cap_out_wo = dup(sock_fds[0]);
+ EXPECT_OK(cap_out_wo);
+ EXPECT_OK(cap_rights_limit(cap_out_wo, &r_ws));
+
+ off_t offset = 0;
+ EXPECT_NOTCAPABLE(sendfile_(cap_out_ro, cap_in_ro, &offset, 4));
+ EXPECT_NOTCAPABLE(sendfile_(cap_out_wo, cap_in_wo, &offset, 4));
+ EXPECT_OK(sendfile_(cap_out_wo, cap_in_ro, &offset, 4));
+
+ close(cap_in_ro);
+ close(cap_in_wo);
+ close(cap_out_ro);
+ close(cap_out_wo);
+ close(in_fd);
+ close(sock_fds[0]);
+ close(sock_fds[1]);
+ unlink(TmpFile("cap_sendfile_in"));
+}
+
+#ifdef HAVE_TEE
+TEST(CapabilityPair, tee) {
+ int pipe1_fds[2];
+ EXPECT_OK(pipe2(pipe1_fds, O_NONBLOCK));
+ int pipe2_fds[2];
+ EXPECT_OK(pipe2(pipe2_fds, O_NONBLOCK));
+
+ // Put some data into pipe1.
+ unsigned char buffer[4] = {1, 2, 3, 4};
+ EXPECT_OK(write(pipe1_fds[1], buffer, 4));
+
+ cap_rights_t r_ro;
+ cap_rights_init(&r_ro, CAP_READ);
+ cap_rights_t r_wo;
+ cap_rights_init(&r_wo, CAP_WRITE);
+ cap_rights_t r_rw;
+ cap_rights_init(&r_rw, CAP_READ, CAP_WRITE);
+
+ // Various attempts to tee into pipe2.
+ int cap_in_wo = dup(pipe1_fds[0]);
+ EXPECT_OK(cap_in_wo);
+ EXPECT_OK(cap_rights_limit(cap_in_wo, &r_wo));
+ int cap_in_rw = dup(pipe1_fds[0]);
+ EXPECT_OK(cap_in_rw);
+ EXPECT_OK(cap_rights_limit(cap_in_rw, &r_rw));
+ int cap_out_ro = dup(pipe2_fds[1]);
+ EXPECT_OK(cap_out_ro);
+ EXPECT_OK(cap_rights_limit(cap_out_ro, &r_ro));
+ int cap_out_rw = dup(pipe2_fds[1]);
+ EXPECT_OK(cap_out_rw);
+ EXPECT_OK(cap_rights_limit(cap_out_rw, &r_rw));
+
+ EXPECT_NOTCAPABLE(tee(cap_in_wo, cap_out_rw, 4, SPLICE_F_NONBLOCK));
+ EXPECT_NOTCAPABLE(tee(cap_in_rw, cap_out_ro, 4, SPLICE_F_NONBLOCK));
+ EXPECT_OK(tee(cap_in_rw, cap_out_rw, 4, SPLICE_F_NONBLOCK));
+
+ close(cap_in_wo);
+ close(cap_in_rw);
+ close(cap_out_ro);
+ close(cap_out_rw);
+ close(pipe1_fds[0]);
+ close(pipe1_fds[1]);
+ close(pipe2_fds[0]);
+ close(pipe2_fds[1]);
+}
+#endif
+
+#ifdef HAVE_SPLICE
+TEST(CapabilityPair, splice) {
+ int pipe1_fds[2];
+ EXPECT_OK(pipe2(pipe1_fds, O_NONBLOCK));
+ int pipe2_fds[2];
+ EXPECT_OK(pipe2(pipe2_fds, O_NONBLOCK));
+
+ // Put some data into pipe1.
+ unsigned char buffer[4] = {1, 2, 3, 4};
+ EXPECT_OK(write(pipe1_fds[1], buffer, 4));
+
+ cap_rights_t r_ro;
+ cap_rights_init(&r_ro, CAP_READ);
+ cap_rights_t r_wo;
+ cap_rights_init(&r_wo, CAP_WRITE);
+ cap_rights_t r_rs;
+ cap_rights_init(&r_rs, CAP_READ, CAP_SEEK);
+ cap_rights_t r_ws;
+ cap_rights_init(&r_ws, CAP_WRITE, CAP_SEEK);
+
+ // Various attempts to splice.
+ int cap_in_wo = dup(pipe1_fds[0]);
+ EXPECT_OK(cap_in_wo);
+ EXPECT_OK(cap_rights_limit(cap_in_wo, &r_wo));
+ int cap_in_ro = dup(pipe1_fds[0]);
+ EXPECT_OK(cap_in_ro);
+ EXPECT_OK(cap_rights_limit(cap_in_ro, &r_ro));
+ int cap_in_ro_seek = dup(pipe1_fds[0]);
+ EXPECT_OK(cap_in_ro_seek);
+ EXPECT_OK(cap_rights_limit(cap_in_ro_seek, &r_rs));
+ int cap_out_wo = dup(pipe2_fds[1]);
+ EXPECT_OK(cap_out_wo);
+ EXPECT_OK(cap_rights_limit(cap_out_wo, &r_wo));
+ int cap_out_ro = dup(pipe2_fds[1]);
+ EXPECT_OK(cap_out_ro);
+ EXPECT_OK(cap_rights_limit(cap_out_ro, &r_ro));
+ int cap_out_wo_seek = dup(pipe2_fds[1]);
+ EXPECT_OK(cap_out_wo_seek);
+ EXPECT_OK(cap_rights_limit(cap_out_wo_seek, &r_ws));
+
+ EXPECT_NOTCAPABLE(splice(cap_in_ro, NULL, cap_out_wo_seek, NULL, 4, SPLICE_F_NONBLOCK));
+ EXPECT_NOTCAPABLE(splice(cap_in_wo, NULL, cap_out_wo_seek, NULL, 4, SPLICE_F_NONBLOCK));
+ EXPECT_NOTCAPABLE(splice(cap_in_ro_seek, NULL, cap_out_ro, NULL, 4, SPLICE_F_NONBLOCK));
+ EXPECT_NOTCAPABLE(splice(cap_in_ro_seek, NULL, cap_out_wo, NULL, 4, SPLICE_F_NONBLOCK));
+ EXPECT_OK(splice(cap_in_ro_seek, NULL, cap_out_wo_seek, NULL, 4, SPLICE_F_NONBLOCK));
+
+ close(cap_in_wo);
+ close(cap_in_ro);
+ close(cap_in_ro_seek);
+ close(cap_out_wo);
+ close(cap_out_ro);
+ close(cap_out_wo_seek);
+ close(pipe1_fds[0]);
+ close(pipe1_fds[1]);
+ close(pipe2_fds[0]);
+ close(pipe2_fds[1]);
+}
+#endif
+
+#ifdef HAVE_VMSPLICE
+// Although it only involves a single file descriptor, test vmsplice(2) here too.
+TEST(CapabilityPair, vmsplice) {
+ int pipe_fds[2];
+ EXPECT_OK(pipe2(pipe_fds, O_NONBLOCK));
+
+ cap_rights_t r_ro;
+ cap_rights_init(&r_ro, CAP_READ);
+ cap_rights_t r_rw;
+ cap_rights_init(&r_rw, CAP_READ, CAP_WRITE);
+
+ int cap_ro = dup(pipe_fds[1]);
+ EXPECT_OK(cap_ro);
+ EXPECT_OK(cap_rights_limit(cap_ro, &r_ro));
+ int cap_rw = dup(pipe_fds[1]);
+ EXPECT_OK(cap_rw);
+ EXPECT_OK(cap_rights_limit(cap_rw, &r_rw));
+
+ unsigned char buffer[4] = {1, 2, 3, 4};
+ struct iovec iov;
+ memset(&iov, 0, sizeof(iov));
+ iov.iov_base = buffer;
+ iov.iov_len = sizeof(buffer);
+
+ EXPECT_NOTCAPABLE(vmsplice(cap_ro, &iov, 1, SPLICE_F_NONBLOCK));
+ EXPECT_OK(vmsplice(cap_rw, &iov, 1, SPLICE_F_NONBLOCK));
+
+ close(cap_ro);
+ close(cap_rw);
+ close(pipe_fds[0]);
+ close(pipe_fds[1]);
+}
+#endif
Index: contrib/capsicum-test/capability-fd.cc
===================================================================
--- /dev/null
+++ contrib/capsicum-test/capability-fd.cc
@@ -0,0 +1,1309 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/file.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <sys/select.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <stdint.h>
+
+#include "capsicum.h"
+#include "syscalls.h"
+#include "capsicum-test.h"
+
+/* Utilities for printing rights information */
+/* Written in C style to allow for: */
+/* TODO(drysdale): migrate these to somewhere in libcaprights/ */
+#define RIGHTS_INFO(RR) { (RR), #RR}
+typedef struct {
+ uint64_t right;
+ const char* name;
+} right_info;
+static right_info known_rights[] = {
+ /* Rights that are common to all versions of Capsicum */
+ RIGHTS_INFO(CAP_READ),
+ RIGHTS_INFO(CAP_WRITE),
+ RIGHTS_INFO(CAP_SEEK_TELL),
+ RIGHTS_INFO(CAP_SEEK),
+ RIGHTS_INFO(CAP_PREAD),
+ RIGHTS_INFO(CAP_PWRITE),
+ RIGHTS_INFO(CAP_MMAP),
+ RIGHTS_INFO(CAP_MMAP_R),
+ RIGHTS_INFO(CAP_MMAP_W),
+ RIGHTS_INFO(CAP_MMAP_X),
+ RIGHTS_INFO(CAP_MMAP_RW),
+ RIGHTS_INFO(CAP_MMAP_RX),
+ RIGHTS_INFO(CAP_MMAP_WX),
+ RIGHTS_INFO(CAP_MMAP_RWX),
+ RIGHTS_INFO(CAP_CREATE),
+ RIGHTS_INFO(CAP_FEXECVE),
+ RIGHTS_INFO(CAP_FSYNC),
+ RIGHTS_INFO(CAP_FTRUNCATE),
+ RIGHTS_INFO(CAP_LOOKUP),
+ RIGHTS_INFO(CAP_FCHDIR),
+ RIGHTS_INFO(CAP_FCHFLAGS),
+ RIGHTS_INFO(CAP_CHFLAGSAT),
+ RIGHTS_INFO(CAP_FCHMOD),
+ RIGHTS_INFO(CAP_FCHMODAT),
+ RIGHTS_INFO(CAP_FCHOWN),
+ RIGHTS_INFO(CAP_FCHOWNAT),
+ RIGHTS_INFO(CAP_FCNTL),
+ RIGHTS_INFO(CAP_FLOCK),
+ RIGHTS_INFO(CAP_FPATHCONF),
+ RIGHTS_INFO(CAP_FSCK),
+ RIGHTS_INFO(CAP_FSTAT),
+ RIGHTS_INFO(CAP_FSTATAT),
+ RIGHTS_INFO(CAP_FSTATFS),
+ RIGHTS_INFO(CAP_FUTIMES),
+ RIGHTS_INFO(CAP_FUTIMESAT),
+ RIGHTS_INFO(CAP_MKDIRAT),
+ RIGHTS_INFO(CAP_MKFIFOAT),
+ RIGHTS_INFO(CAP_MKNODAT),
+ RIGHTS_INFO(CAP_RENAMEAT_SOURCE),
+ RIGHTS_INFO(CAP_SYMLINKAT),
+ RIGHTS_INFO(CAP_UNLINKAT),
+ RIGHTS_INFO(CAP_ACCEPT),
+ RIGHTS_INFO(CAP_BIND),
+ RIGHTS_INFO(CAP_CONNECT),
+ RIGHTS_INFO(CAP_GETPEERNAME),
+ RIGHTS_INFO(CAP_GETSOCKNAME),
+ RIGHTS_INFO(CAP_GETSOCKOPT),
+ RIGHTS_INFO(CAP_LISTEN),
+ RIGHTS_INFO(CAP_PEELOFF),
+ RIGHTS_INFO(CAP_RECV),
+ RIGHTS_INFO(CAP_SEND),
+ RIGHTS_INFO(CAP_SETSOCKOPT),
+ RIGHTS_INFO(CAP_SHUTDOWN),
+ RIGHTS_INFO(CAP_BINDAT),
+ RIGHTS_INFO(CAP_CONNECTAT),
+ RIGHTS_INFO(CAP_LINKAT_SOURCE),
+ RIGHTS_INFO(CAP_RENAMEAT_TARGET),
+ RIGHTS_INFO(CAP_SOCK_CLIENT),
+ RIGHTS_INFO(CAP_SOCK_SERVER),
+ RIGHTS_INFO(CAP_MAC_GET),
+ RIGHTS_INFO(CAP_MAC_SET),
+ RIGHTS_INFO(CAP_SEM_GETVALUE),
+ RIGHTS_INFO(CAP_SEM_POST),
+ RIGHTS_INFO(CAP_SEM_WAIT),
+ RIGHTS_INFO(CAP_EVENT),
+ RIGHTS_INFO(CAP_KQUEUE_EVENT),
+ RIGHTS_INFO(CAP_IOCTL),
+ RIGHTS_INFO(CAP_TTYHOOK),
+ RIGHTS_INFO(CAP_PDWAIT),
+ RIGHTS_INFO(CAP_PDGETPID),
+ RIGHTS_INFO(CAP_PDKILL),
+ RIGHTS_INFO(CAP_EXTATTR_DELETE),
+ RIGHTS_INFO(CAP_EXTATTR_GET),
+ RIGHTS_INFO(CAP_EXTATTR_LIST),
+ RIGHTS_INFO(CAP_EXTATTR_SET),
+ RIGHTS_INFO(CAP_ACL_CHECK),
+ RIGHTS_INFO(CAP_ACL_DELETE),
+ RIGHTS_INFO(CAP_ACL_GET),
+ RIGHTS_INFO(CAP_ACL_SET),
+ RIGHTS_INFO(CAP_KQUEUE_CHANGE),
+ RIGHTS_INFO(CAP_KQUEUE),
+ /* Rights that are only present in some version or some OS, and so are #ifdef'ed */
+ /* LINKAT got split */
+#ifdef CAP_LINKAT
+ RIGHTS_INFO(CAP_LINKAT),
+#endif
+#ifdef CAP_LINKAT_SOURCE
+ RIGHTS_INFO(CAP_LINKAT_SOURCE),
+#endif
+#ifdef CAP_LINKAT_TARGET
+ RIGHTS_INFO(CAP_LINKAT_TARGET),
+#endif
+ /* Linux aliased some FD operations for pdgetpid/pdkill */
+#ifdef CAP_PDGETPID_FREEBSD
+ RIGHTS_INFO(CAP_PDGETPID_FREEBSD),
+#endif
+#ifdef CAP_PDKILL_FREEBSD
+ RIGHTS_INFO(CAP_PDKILL_FREEBSD),
+#endif
+ /* Linux-specific rights */
+#ifdef CAP_FSIGNAL
+ RIGHTS_INFO(CAP_FSIGNAL),
+#endif
+#ifdef CAP_EPOLL_CTL
+ RIGHTS_INFO(CAP_EPOLL_CTL),
+#endif
+#ifdef CAP_NOTIFY
+ RIGHTS_INFO(CAP_NOTIFY),
+#endif
+#ifdef CAP_SETNS
+ RIGHTS_INFO(CAP_SETNS),
+#endif
+#ifdef CAP_PERFMON
+ RIGHTS_INFO(CAP_PERFMON),
+#endif
+#ifdef CAP_BPF
+ RIGHTS_INFO(CAP_BPF),
+#endif
+ /* Rights in later versions of FreeBSD (>10.0) */
+};
+
+void ShowCapRights(FILE *out, int fd) {
+ size_t ii;
+ bool first = true;
+ cap_rights_t rights;
+ CAP_SET_NONE(&rights);
+ if (cap_rights_get(fd, &rights) < 0) {
+ fprintf(out, "Failed to get rights for fd %d: errno %d\n", fd, errno);
+ return;
+ }
+
+ /* First print out all known rights */
+ size_t num_known = (sizeof(known_rights)/sizeof(known_rights[0]));
+ for (ii = 0; ii < num_known; ii++) {
+ if (cap_rights_is_set(&rights, known_rights[ii].right)) {
+ if (!first) fprintf(out, ",");
+ first = false;
+ fprintf(out, "%s", known_rights[ii].name);
+ }
+ }
+ /* Now repeat the loop, clearing rights we know of; this needs to be
+ * a separate loop because some named rights overlap.
+ */
+ for (ii = 0; ii < num_known; ii++) {
+ cap_rights_clear(&rights, known_rights[ii].right);
+ }
+ /* The following relies on the internal structure of cap_rights_t to
+ * try to show rights we don't know about. */
+ for (ii = 0; ii < (size_t)CAPARSIZE(&rights); ii++) {
+ uint64_t bits = (rights.cr_rights[0] & 0x01ffffffffffffffULL);
+ if (bits != 0) {
+ uint64_t which = 1;
+ for (which = 1; which < 0x0200000000000000 ; which <<= 1) {
+ if (bits & which) {
+ if (!first) fprintf(out, ",");
+ fprintf(out, "CAP_RIGHT(%d, 0x%016llxULL)", (int)ii, (long long unsigned)which);
+ }
+ }
+ }
+ }
+ fprintf(out, "\n");
+}
+
+void ShowAllCapRights(FILE *out) {
+ int fd;
+ struct rlimit limits;
+ if (getrlimit(RLIMIT_NOFILE, &limits) != 0) {
+ fprintf(out, "Failed to getrlimit for max FDs: errno %d\n", errno);
+ return;
+ }
+ for (fd = 0; fd < (int)limits.rlim_cur; fd++) {
+ if (fcntl(fd, F_GETFD, 0) != 0) {
+ continue;
+ }
+ fprintf(out, "fd %d: ", fd);
+ ShowCapRights(out, fd);
+ }
+}
+
+FORK_TEST(Capability, CapNew) {
+ cap_rights_t r_rws;
+ cap_rights_init(&r_rws, CAP_READ, CAP_WRITE, CAP_SEEK);
+ cap_rights_t r_all;
+ CAP_SET_ALL(&r_all);
+
+ int cap_fd = dup(STDOUT_FILENO);
+ cap_rights_t rights;
+ CAP_SET_NONE(&rights);
+ EXPECT_OK(cap_rights_get(cap_fd, &rights));
+ EXPECT_RIGHTS_EQ(&r_all, &rights);
+
+ EXPECT_OK(cap_fd);
+ EXPECT_OK(cap_rights_limit(cap_fd, &r_rws));
+ if (cap_fd < 0) return;
+ int rc = write(cap_fd, "OK!\n", 4);
+ EXPECT_OK(rc);
+ EXPECT_EQ(4, rc);
+ EXPECT_OK(cap_rights_get(cap_fd, &rights));
+ EXPECT_RIGHTS_EQ(&r_rws, &rights);
+
+ // dup/dup2 should preserve rights.
+ int cap_dup = dup(cap_fd);
+ EXPECT_OK(cap_dup);
+ EXPECT_OK(cap_rights_get(cap_dup, &rights));
+ EXPECT_RIGHTS_EQ(&r_rws, &rights);
+ close(cap_dup);
+ EXPECT_OK(dup2(cap_fd, cap_dup));
+ EXPECT_OK(cap_rights_get(cap_dup, &rights));
+ EXPECT_RIGHTS_EQ(&r_rws, &rights);
+ close(cap_dup);
+#ifdef HAVE_DUP3
+ EXPECT_OK(dup3(cap_fd, cap_dup, 0));
+ EXPECT_OK(cap_rights_get(cap_dup, &rights));
+ EXPECT_RIGHTS_EQ(&r_rws, &rights);
+ close(cap_dup);
+#endif
+
+ // Try to get a disjoint set of rights in a sub-capability.
+ cap_rights_t r_rs;
+ cap_rights_init(&r_rs, CAP_READ, CAP_SEEK);
+ cap_rights_t r_rsmapchmod;
+ cap_rights_init(&r_rsmapchmod, CAP_READ, CAP_SEEK, CAP_MMAP, CAP_FCHMOD);
+ int cap_cap_fd = dup(cap_fd);
+ EXPECT_OK(cap_cap_fd);
+ EXPECT_NOTCAPABLE(cap_rights_limit(cap_cap_fd, &r_rsmapchmod));
+
+ // Dump rights info to stderr (mostly to ensure that Show[All]CapRights()
+ // is working.
+ ShowAllCapRights(stderr);
+
+ EXPECT_OK(close(cap_fd));
+}
+
+FORK_TEST(Capability, CapEnter) {
+ EXPECT_EQ(0, cap_enter());
+}
+
+FORK_TEST(Capability, BasicInterception) {
+ cap_rights_t r_0;
+ cap_rights_init(&r_0, 0);
+ int cap_fd = dup(1);
+ EXPECT_OK(cap_fd);
+ EXPECT_OK(cap_rights_limit(cap_fd, &r_0));
+
+ EXPECT_NOTCAPABLE(write(cap_fd, "", 0));
+
+ EXPECT_OK(cap_enter()); // Enter capability mode
+
+ EXPECT_NOTCAPABLE(write(cap_fd, "", 0));
+
+ // Create a new capability which does have write permission
+ cap_rights_t r_ws;
+ cap_rights_init(&r_ws, CAP_WRITE, CAP_SEEK);
+ int cap_fd2 = dup(1);
+ EXPECT_OK(cap_fd2);
+ EXPECT_OK(cap_rights_limit(cap_fd2, &r_ws));
+ EXPECT_OK(write(cap_fd2, "", 0));
+
+ // Tidy up.
+ if (cap_fd >= 0) close(cap_fd);
+ if (cap_fd2 >= 0) close(cap_fd2);
+}
+
+FORK_TEST_ON(Capability, OpenAtDirectoryTraversal, TmpFile("cap_openat_testfile")) {
+ int dir = open(tmpdir.c_str(), O_RDONLY);
+ EXPECT_OK(dir);
+
+ cap_enter();
+
+ int file = openat(dir, "cap_openat_testfile", O_RDONLY|O_CREAT, 0644);
+ EXPECT_OK(file);
+
+ // Test that we are confined to /tmp, and cannot
+ // escape using absolute paths or ../.
+ int new_file = openat(dir, "../dev/null", O_RDONLY);
+ EXPECT_EQ(-1, new_file);
+
+ new_file = openat(dir, "..", O_RDONLY);
+ EXPECT_EQ(-1, new_file);
+
+ new_file = openat(dir, "/dev/null", O_RDONLY);
+ EXPECT_EQ(-1, new_file);
+
+ new_file = openat(dir, "/", O_RDONLY);
+ EXPECT_EQ(-1, new_file);
+
+ // Tidy up.
+ close(file);
+ close(dir);
+}
+
+FORK_TEST_ON(Capability, FileInSync, TmpFile("cap_file_sync")) {
+ int fd = open(TmpFile("cap_file_sync"), O_RDWR|O_CREAT, 0644);
+ EXPECT_OK(fd);
+ const char* message = "Hello capability world";
+ EXPECT_OK(write(fd, message, strlen(message)));
+
+ cap_rights_t r_rsstat;
+ cap_rights_init(&r_rsstat, CAP_READ, CAP_SEEK, CAP_FSTAT);
+
+ int cap_fd = dup(fd);
+ EXPECT_OK(cap_fd);
+ EXPECT_OK(cap_rights_limit(cap_fd, &r_rsstat));
+ int cap_cap_fd = dup(cap_fd);
+ EXPECT_OK(cap_cap_fd);
+ EXPECT_OK(cap_rights_limit(cap_cap_fd, &r_rsstat));
+
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+
+ // Changes to one file descriptor affect the others.
+ EXPECT_EQ(1, lseek(fd, 1, SEEK_SET));
+ EXPECT_EQ(1, lseek(fd, 0, SEEK_CUR));
+ EXPECT_EQ(1, lseek(cap_fd, 0, SEEK_CUR));
+ EXPECT_EQ(1, lseek(cap_cap_fd, 0, SEEK_CUR));
+ EXPECT_EQ(3, lseek(cap_fd, 3, SEEK_SET));
+ EXPECT_EQ(3, lseek(fd, 0, SEEK_CUR));
+ EXPECT_EQ(3, lseek(cap_fd, 0, SEEK_CUR));
+ EXPECT_EQ(3, lseek(cap_cap_fd, 0, SEEK_CUR));
+ EXPECT_EQ(5, lseek(cap_cap_fd, 5, SEEK_SET));
+ EXPECT_EQ(5, lseek(fd, 0, SEEK_CUR));
+ EXPECT_EQ(5, lseek(cap_fd, 0, SEEK_CUR));
+ EXPECT_EQ(5, lseek(cap_cap_fd, 0, SEEK_CUR));
+
+ close(cap_cap_fd);
+ close(cap_fd);
+ close(fd);
+}
+
+// Create a capability on /tmp that does not allow CAP_WRITE,
+// and check that this restriction is inherited through openat().
+FORK_TEST_ON(Capability, Inheritance, TmpFile("cap_openat_write_testfile")) {
+ int dir = open(tmpdir.c_str(), O_RDONLY);
+ EXPECT_OK(dir);
+
+ cap_rights_t r_rl;
+ cap_rights_init(&r_rl, CAP_READ, CAP_LOOKUP);
+
+ int cap_dir = dup(dir);
+ EXPECT_OK(cap_dir);
+ EXPECT_OK(cap_rights_limit(cap_dir, &r_rl));
+
+ const char *filename = "cap_openat_write_testfile";
+ int file = openat(dir, filename, O_WRONLY|O_CREAT, 0644);
+ EXPECT_OK(file);
+ EXPECT_EQ(5, write(file, "TEST\n", 5));
+ if (file >= 0) close(file);
+
+ EXPECT_OK(cap_enter());
+ file = openat(cap_dir, filename, O_RDONLY);
+ EXPECT_OK(file);
+
+ cap_rights_t rights;
+ cap_rights_init(&rights, 0);
+ EXPECT_OK(cap_rights_get(file, &rights));
+ EXPECT_RIGHTS_EQ(&r_rl, &rights);
+ if (file >= 0) close(file);
+
+ file = openat(cap_dir, filename, O_WRONLY|O_APPEND);
+ EXPECT_NOTCAPABLE(file);
+ if (file > 0) close(file);
+
+ if (dir > 0) close(dir);
+ if (cap_dir > 0) close(cap_dir);
+}
+
+
+// Ensure that, if the capability had enough rights for the system call to
+// pass, then it did. Otherwise, ensure that the errno is ENOTCAPABLE;
+// capability restrictions should kick in before any other error logic.
+#define CHECK_RIGHT_RESULT(result, rights, ...) do { \
+ cap_rights_t rights_needed; \
+ cap_rights_init(&rights_needed, __VA_ARGS__); \
+ if (cap_rights_contains(&rights, &rights_needed)) { \
+ EXPECT_OK(result) << std::endl \
+ << " need: " << rights_needed \
+ << std::endl \
+ << " got: " << rights; \
+ } else { \
+ EXPECT_EQ(-1, result) << " need: " << rights_needed \
+ << std::endl \
+ << " got: "<< rights; \
+ EXPECT_EQ(ENOTCAPABLE, errno); \
+ } \
+} while (0)
+
+#define EXPECT_MMAP_NOTCAPABLE(result) do { \
+ void *rv = result; \
+ EXPECT_EQ(MAP_FAILED, rv); \
+ EXPECT_EQ(ENOTCAPABLE, errno); \
+ if (rv != MAP_FAILED) munmap(rv, getpagesize()); \
+} while (0)
+
+#define EXPECT_MMAP_OK(result) do { \
+ void *rv = result; \
+ EXPECT_NE(MAP_FAILED, rv) << " with errno " << errno; \
+ if (rv != MAP_FAILED) munmap(rv, getpagesize()); \
+} while (0)
+
+
+// As above, but for the special mmap() case: unmap after successful mmap().
+#define CHECK_RIGHT_MMAP_RESULT(result, rights, ...) do { \
+ cap_rights_t rights_needed; \
+ cap_rights_init(&rights_needed, __VA_ARGS__); \
+ if (cap_rights_contains(&rights, &rights_needed)) { \
+ EXPECT_MMAP_OK(result); \
+ } else { \
+ EXPECT_MMAP_NOTCAPABLE(result); \
+ } \
+} while (0)
+
+FORK_TEST_ON(Capability, Mmap, TmpFile("cap_mmap_operations")) {
+ int fd = open(TmpFile("cap_mmap_operations"), O_RDWR | O_CREAT, 0644);
+ EXPECT_OK(fd);
+ if (fd < 0) return;
+
+ cap_rights_t r_0;
+ cap_rights_init(&r_0, 0);
+ cap_rights_t r_mmap;
+ cap_rights_init(&r_mmap, CAP_MMAP);
+ cap_rights_t r_r;
+ cap_rights_init(&r_r, CAP_PREAD);
+ cap_rights_t r_rmmap;
+ cap_rights_init(&r_rmmap, CAP_PREAD, CAP_MMAP);
+
+ // If we're missing a capability, it will fail.
+ int cap_none = dup(fd);
+ EXPECT_OK(cap_none);
+ EXPECT_OK(cap_rights_limit(cap_none, &r_0));
+ int cap_mmap = dup(fd);
+ EXPECT_OK(cap_mmap);
+ EXPECT_OK(cap_rights_limit(cap_mmap, &r_mmap));
+ int cap_read = dup(fd);
+ EXPECT_OK(cap_read);
+ EXPECT_OK(cap_rights_limit(cap_read, &r_r));
+ int cap_both = dup(fd);
+ EXPECT_OK(cap_both);
+ EXPECT_OK(cap_rights_limit(cap_both, &r_rmmap));
+
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+
+ EXPECT_MMAP_NOTCAPABLE(mmap(NULL, getpagesize(), PROT_READ, MAP_PRIVATE, cap_none, 0));
+ EXPECT_MMAP_NOTCAPABLE(mmap(NULL, getpagesize(), PROT_READ, MAP_PRIVATE, cap_mmap, 0));
+ EXPECT_MMAP_NOTCAPABLE(mmap(NULL, getpagesize(), PROT_READ, MAP_PRIVATE, cap_read, 0));
+
+ EXPECT_MMAP_OK(mmap(NULL, getpagesize(), PROT_READ, MAP_PRIVATE, cap_both, 0));
+
+ // A call with MAP_ANONYMOUS should succeed without any capability requirements.
+ EXPECT_MMAP_OK(mmap(NULL, getpagesize(), PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0));
+
+ EXPECT_OK(close(cap_both));
+ EXPECT_OK(close(cap_read));
+ EXPECT_OK(close(cap_mmap));
+ EXPECT_OK(close(cap_none));
+ EXPECT_OK(close(fd));
+}
+
+// Given a file descriptor, create a capability with specific rights and
+// make sure only those rights work.
+#define TRY_FILE_OPS(fd, ...) do { \
+ cap_rights_t rights; \
+ cap_rights_init(&rights, __VA_ARGS__); \
+ TryFileOps((fd), rights); \
+} while (0)
+
+static void TryFileOps(int fd, cap_rights_t rights) {
+ int cap_fd = dup(fd);
+ EXPECT_OK(cap_fd);
+ EXPECT_OK(cap_rights_limit(cap_fd, &rights));
+ if (cap_fd < 0) return;
+ cap_rights_t erights;
+ EXPECT_OK(cap_rights_get(cap_fd, &erights));
+ EXPECT_RIGHTS_EQ(&rights, &erights);
+
+ // Check creation of a capability from a capability.
+ int cap_cap_fd = dup(cap_fd);
+ EXPECT_OK(cap_cap_fd);
+ EXPECT_OK(cap_rights_limit(cap_cap_fd, &rights));
+ EXPECT_NE(cap_fd, cap_cap_fd);
+ EXPECT_OK(cap_rights_get(cap_cap_fd, &erights));
+ EXPECT_RIGHTS_EQ(&rights, &erights);
+ close(cap_cap_fd);
+
+ char ch;
+ CHECK_RIGHT_RESULT(read(cap_fd, &ch, sizeof(ch)), rights, CAP_READ, CAP_SEEK_ASWAS);
+
+ ssize_t len1 = pread(cap_fd, &ch, sizeof(ch), 0);
+ CHECK_RIGHT_RESULT(len1, rights, CAP_PREAD);
+ ssize_t len2 = pread(cap_fd, &ch, sizeof(ch), 0);
+ CHECK_RIGHT_RESULT(len2, rights, CAP_PREAD);
+ EXPECT_EQ(len1, len2);
+
+ CHECK_RIGHT_RESULT(write(cap_fd, &ch, sizeof(ch)), rights, CAP_WRITE, CAP_SEEK_ASWAS);
+ CHECK_RIGHT_RESULT(pwrite(cap_fd, &ch, sizeof(ch), 0), rights, CAP_PWRITE);
+ CHECK_RIGHT_RESULT(lseek(cap_fd, 0, SEEK_SET), rights, CAP_SEEK);
+
+#ifdef HAVE_CHFLAGS
+ // Note: this is not expected to work over NFS.
+ struct statfs sf;
+ EXPECT_OK(fstatfs(fd, &sf));
+ bool is_nfs = (strncmp("nfs", sf.f_fstypename, sizeof(sf.f_fstypename)) == 0);
+ if (!is_nfs) {
+ CHECK_RIGHT_RESULT(fchflags(cap_fd, UF_NODUMP), rights, CAP_FCHFLAGS);
+ }
+#endif
+
+ CHECK_RIGHT_MMAP_RESULT(mmap(NULL, getpagesize(), PROT_NONE, MAP_SHARED, cap_fd, 0),
+ rights, CAP_MMAP);
+ CHECK_RIGHT_MMAP_RESULT(mmap(NULL, getpagesize(), PROT_READ, MAP_SHARED, cap_fd, 0),
+ rights, CAP_MMAP_R);
+ CHECK_RIGHT_MMAP_RESULT(mmap(NULL, getpagesize(), PROT_WRITE, MAP_SHARED, cap_fd, 0),
+ rights, CAP_MMAP_W);
+ CHECK_RIGHT_MMAP_RESULT(mmap(NULL, getpagesize(), PROT_EXEC, MAP_SHARED, cap_fd, 0),
+ rights, CAP_MMAP_X);
+ CHECK_RIGHT_MMAP_RESULT(mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE, MAP_SHARED, cap_fd, 0),
+ rights, CAP_MMAP_RW);
+ CHECK_RIGHT_MMAP_RESULT(mmap(NULL, getpagesize(), PROT_READ | PROT_EXEC, MAP_SHARED, cap_fd, 0),
+ rights, CAP_MMAP_RX);
+ CHECK_RIGHT_MMAP_RESULT(mmap(NULL, getpagesize(), PROT_EXEC | PROT_WRITE, MAP_SHARED, cap_fd, 0),
+ rights, CAP_MMAP_WX);
+ CHECK_RIGHT_MMAP_RESULT(mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE | PROT_EXEC, MAP_SHARED, cap_fd, 0),
+ rights, CAP_MMAP_RWX);
+
+ CHECK_RIGHT_RESULT(fsync(cap_fd), rights, CAP_FSYNC);
+#ifdef HAVE_SYNC_FILE_RANGE
+ CHECK_RIGHT_RESULT(sync_file_range(cap_fd, 0, 1, 0), rights, CAP_FSYNC, CAP_SEEK);
+#endif
+
+ int rc = fcntl(cap_fd, F_GETFL);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_FCNTL);
+ rc = fcntl(cap_fd, F_SETFL, rc);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_FCNTL);
+
+ CHECK_RIGHT_RESULT(fchown(cap_fd, -1, -1), rights, CAP_FCHOWN);
+
+ CHECK_RIGHT_RESULT(fchmod(cap_fd, 0644), rights, CAP_FCHMOD);
+
+ CHECK_RIGHT_RESULT(flock(cap_fd, LOCK_SH), rights, CAP_FLOCK);
+ CHECK_RIGHT_RESULT(flock(cap_fd, LOCK_UN), rights, CAP_FLOCK);
+
+ CHECK_RIGHT_RESULT(ftruncate(cap_fd, 0), rights, CAP_FTRUNCATE);
+
+ struct stat sb;
+ CHECK_RIGHT_RESULT(fstat(cap_fd, &sb), rights, CAP_FSTAT);
+
+ struct statfs cap_sf;
+ CHECK_RIGHT_RESULT(fstatfs(cap_fd, &cap_sf), rights, CAP_FSTATFS);
+
+#ifdef HAVE_FPATHCONF
+ CHECK_RIGHT_RESULT(fpathconf(cap_fd, _PC_NAME_MAX), rights, CAP_FPATHCONF);
+#endif
+
+ CHECK_RIGHT_RESULT(futimes(cap_fd, NULL), rights, CAP_FUTIMES);
+
+ struct pollfd pollfd;
+ pollfd.fd = cap_fd;
+ pollfd.events = POLLIN | POLLERR | POLLHUP;
+ pollfd.revents = 0;
+ int ret = poll(&pollfd, 1, 0);
+ if (cap_rights_is_set(&rights, CAP_EVENT)) {
+ EXPECT_OK(ret);
+ } else {
+ EXPECT_NE(0, (pollfd.revents & POLLNVAL));
+ }
+
+ struct timeval tv;
+ tv.tv_sec = 0;
+ tv.tv_usec = 100;
+ fd_set rset;
+ FD_ZERO(&rset);
+ FD_SET(cap_fd, &rset);
+ fd_set wset;
+ FD_ZERO(&wset);
+ FD_SET(cap_fd, &wset);
+ ret = select(cap_fd+1, &rset, &wset, NULL, &tv);
+ if (cap_rights_is_set(&rights, CAP_EVENT)) {
+ EXPECT_OK(ret);
+ } else {
+ EXPECT_NOTCAPABLE(ret);
+ }
+
+ // TODO(FreeBSD): kqueue
+
+ EXPECT_OK(close(cap_fd));
+}
+
+FORK_TEST_ON(Capability, Operations, TmpFile("cap_fd_operations")) {
+ int fd = open(TmpFile("cap_fd_operations"), O_RDWR | O_CREAT, 0644);
+ EXPECT_OK(fd);
+ if (fd < 0) return;
+
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+
+ // Try a variety of different combinations of rights - a full
+ // enumeration is too large (2^N with N~30+) to perform.
+ TRY_FILE_OPS(fd, CAP_READ);
+ TRY_FILE_OPS(fd, CAP_PREAD);
+ TRY_FILE_OPS(fd, CAP_WRITE);
+ TRY_FILE_OPS(fd, CAP_PWRITE);
+ TRY_FILE_OPS(fd, CAP_READ, CAP_WRITE);
+ TRY_FILE_OPS(fd, CAP_PREAD, CAP_PWRITE);
+ TRY_FILE_OPS(fd, CAP_SEEK);
+ TRY_FILE_OPS(fd, CAP_FCHFLAGS);
+ TRY_FILE_OPS(fd, CAP_IOCTL);
+ TRY_FILE_OPS(fd, CAP_FSTAT);
+ TRY_FILE_OPS(fd, CAP_MMAP);
+ TRY_FILE_OPS(fd, CAP_MMAP_R);
+ TRY_FILE_OPS(fd, CAP_MMAP_W);
+ TRY_FILE_OPS(fd, CAP_MMAP_X);
+ TRY_FILE_OPS(fd, CAP_MMAP_RW);
+ TRY_FILE_OPS(fd, CAP_MMAP_RX);
+ TRY_FILE_OPS(fd, CAP_MMAP_WX);
+ TRY_FILE_OPS(fd, CAP_MMAP_RWX);
+ TRY_FILE_OPS(fd, CAP_FCNTL);
+ TRY_FILE_OPS(fd, CAP_EVENT);
+ TRY_FILE_OPS(fd, CAP_FSYNC);
+ TRY_FILE_OPS(fd, CAP_FCHOWN);
+ TRY_FILE_OPS(fd, CAP_FCHMOD);
+ TRY_FILE_OPS(fd, CAP_FTRUNCATE);
+ TRY_FILE_OPS(fd, CAP_FLOCK);
+ TRY_FILE_OPS(fd, CAP_FSTATFS);
+ TRY_FILE_OPS(fd, CAP_FPATHCONF);
+ TRY_FILE_OPS(fd, CAP_FUTIMES);
+ TRY_FILE_OPS(fd, CAP_ACL_GET);
+ TRY_FILE_OPS(fd, CAP_ACL_SET);
+ TRY_FILE_OPS(fd, CAP_ACL_DELETE);
+ TRY_FILE_OPS(fd, CAP_ACL_CHECK);
+ TRY_FILE_OPS(fd, CAP_EXTATTR_GET);
+ TRY_FILE_OPS(fd, CAP_EXTATTR_SET);
+ TRY_FILE_OPS(fd, CAP_EXTATTR_DELETE);
+ TRY_FILE_OPS(fd, CAP_EXTATTR_LIST);
+ TRY_FILE_OPS(fd, CAP_MAC_GET);
+ TRY_FILE_OPS(fd, CAP_MAC_SET);
+
+ // Socket-specific.
+ TRY_FILE_OPS(fd, CAP_GETPEERNAME);
+ TRY_FILE_OPS(fd, CAP_GETSOCKNAME);
+ TRY_FILE_OPS(fd, CAP_ACCEPT);
+
+ close(fd);
+}
+
+#define TRY_DIR_OPS(dfd, ...) do { \
+ cap_rights_t rights; \
+ cap_rights_init(&rights, __VA_ARGS__); \
+ TryDirOps((dfd), rights); \
+} while (0)
+
+static void TryDirOps(int dirfd, cap_rights_t rights) {
+ cap_rights_t erights;
+ int dfd_cap = dup(dirfd);
+ EXPECT_OK(dfd_cap);
+ EXPECT_OK(cap_rights_limit(dfd_cap, &rights));
+ EXPECT_OK(cap_rights_get(dfd_cap, &erights));
+ EXPECT_RIGHTS_EQ(&rights, &erights);
+
+ int rc = openat(dfd_cap, "cap_create", O_CREAT | O_RDONLY, 0600);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_CREATE, CAP_READ, CAP_LOOKUP);
+ if (rc >= 0) {
+ EXPECT_OK(close(rc));
+ EXPECT_OK(unlinkat(dirfd, "cap_create", 0));
+ }
+ rc = openat(dfd_cap, "cap_create", O_CREAT | O_WRONLY | O_APPEND, 0600);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_CREATE, CAP_WRITE, CAP_LOOKUP);
+ if (rc >= 0) {
+ EXPECT_OK(close(rc));
+ EXPECT_OK(unlinkat(dirfd, "cap_create", 0));
+ }
+ rc = openat(dfd_cap, "cap_create", O_CREAT | O_RDWR | O_APPEND, 0600);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_CREATE, CAP_READ, CAP_WRITE, CAP_LOOKUP);
+ if (rc >= 0) {
+ EXPECT_OK(close(rc));
+ EXPECT_OK(unlinkat(dirfd, "cap_create", 0));
+ }
+
+ rc = openat(dirfd, "cap_faccess", O_CREAT, 0600);
+ EXPECT_OK(rc);
+ EXPECT_OK(close(rc));
+ rc = faccessat(dfd_cap, "cap_faccess", F_OK, 0);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_FSTAT, CAP_LOOKUP);
+ EXPECT_OK(unlinkat(dirfd, "cap_faccess", 0));
+
+ rc = openat(dirfd, "cap_fsync", O_CREAT, 0600);
+ EXPECT_OK(rc);
+ EXPECT_OK(close(rc));
+ rc = openat(dfd_cap, "cap_fsync", O_FSYNC | O_RDONLY);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_FSYNC, CAP_READ, CAP_LOOKUP);
+ if (rc >= 0) {
+ EXPECT_OK(close(rc));
+ }
+ rc = openat(dfd_cap, "cap_fsync", O_FSYNC | O_WRONLY | O_APPEND);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_FSYNC, CAP_WRITE, CAP_LOOKUP);
+ if (rc >= 0) {
+ EXPECT_OK(close(rc));
+ }
+ rc = openat(dfd_cap, "cap_fsync", O_FSYNC | O_RDWR | O_APPEND);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_FSYNC, CAP_READ, CAP_WRITE, CAP_LOOKUP);
+ if (rc >= 0) {
+ EXPECT_OK(close(rc));
+ }
+ rc = openat(dfd_cap, "cap_fsync", O_SYNC | O_RDONLY);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_FSYNC, CAP_READ, CAP_LOOKUP);
+ if (rc >= 0) {
+ EXPECT_OK(close(rc));
+ }
+ rc = openat(dfd_cap, "cap_fsync", O_SYNC | O_WRONLY | O_APPEND);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_FSYNC, CAP_WRITE, CAP_LOOKUP);
+ if (rc >= 0) {
+ EXPECT_OK(close(rc));
+ }
+ rc = openat(dfd_cap, "cap_fsync", O_SYNC | O_RDWR | O_APPEND);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_FSYNC, CAP_READ, CAP_WRITE, CAP_LOOKUP);
+ if (rc >= 0) {
+ EXPECT_OK(close(rc));
+ }
+ EXPECT_OK(unlinkat(dirfd, "cap_fsync", 0));
+
+ rc = openat(dirfd, "cap_ftruncate", O_CREAT, 0600);
+ EXPECT_OK(rc);
+ EXPECT_OK(close(rc));
+ rc = openat(dfd_cap, "cap_ftruncate", O_TRUNC | O_RDONLY);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_FTRUNCATE, CAP_READ, CAP_LOOKUP);
+ if (rc >= 0) {
+ EXPECT_OK(close(rc));
+ }
+ rc = openat(dfd_cap, "cap_ftruncate", O_TRUNC | O_WRONLY);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_FTRUNCATE, CAP_WRITE, CAP_LOOKUP);
+ if (rc >= 0) {
+ EXPECT_OK(close(rc));
+ }
+ rc = openat(dfd_cap, "cap_ftruncate", O_TRUNC | O_RDWR);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_FTRUNCATE, CAP_READ, CAP_WRITE, CAP_LOOKUP);
+ if (rc >= 0) {
+ EXPECT_OK(close(rc));
+ }
+ EXPECT_OK(unlinkat(dirfd, "cap_ftruncate", 0));
+
+ rc = openat(dfd_cap, "cap_create", O_CREAT | O_WRONLY, 0600);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_CREATE, CAP_WRITE, CAP_SEEK, CAP_LOOKUP);
+ if (rc >= 0) {
+ EXPECT_OK(close(rc));
+ EXPECT_OK(unlinkat(dirfd, "cap_create", 0));
+ }
+ rc = openat(dfd_cap, "cap_create", O_CREAT | O_RDWR, 0600);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_CREATE, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_LOOKUP);
+ if (rc >= 0) {
+ EXPECT_OK(close(rc));
+ EXPECT_OK(unlinkat(dirfd, "cap_create", 0));
+ }
+
+ rc = openat(dirfd, "cap_fsync", O_CREAT, 0600);
+ EXPECT_OK(rc);
+ EXPECT_OK(close(rc));
+ rc = openat(dfd_cap, "cap_fsync", O_FSYNC | O_WRONLY);
+ CHECK_RIGHT_RESULT(rc,
+ rights, CAP_FSYNC, CAP_WRITE, CAP_SEEK, CAP_LOOKUP);
+ if (rc >= 0) {
+ EXPECT_OK(close(rc));
+ }
+ rc = openat(dfd_cap, "cap_fsync", O_FSYNC | O_RDWR);
+ CHECK_RIGHT_RESULT(rc,
+ rights, CAP_FSYNC, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_LOOKUP);
+ if (rc >= 0) {
+ EXPECT_OK(close(rc));
+ }
+ rc = openat(dfd_cap, "cap_fsync", O_SYNC | O_WRONLY);
+ CHECK_RIGHT_RESULT(rc,
+ rights, CAP_FSYNC, CAP_WRITE, CAP_SEEK, CAP_LOOKUP);
+ if (rc >= 0) {
+ EXPECT_OK(close(rc));
+ }
+ rc = openat(dfd_cap, "cap_fsync", O_SYNC | O_RDWR);
+ CHECK_RIGHT_RESULT(rc,
+ rights, CAP_FSYNC, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_LOOKUP);
+ if (rc >= 0) {
+ EXPECT_OK(close(rc));
+ }
+ EXPECT_OK(unlinkat(dirfd, "cap_fsync", 0));
+
+#ifdef HAVE_CHFLAGSAT
+ rc = openat(dirfd, "cap_chflagsat", O_CREAT, 0600);
+ EXPECT_OK(rc);
+ EXPECT_OK(close(rc));
+ rc = chflagsat(dfd_cap, "cap_chflagsat", UF_NODUMP, 0);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_CHFLAGSAT, CAP_LOOKUP);
+ EXPECT_OK(unlinkat(dirfd, "cap_chflagsat", 0));
+#endif
+
+ rc = openat(dirfd, "cap_fchownat", O_CREAT, 0600);
+ EXPECT_OK(rc);
+ EXPECT_OK(close(rc));
+ rc = fchownat(dfd_cap, "cap_fchownat", -1, -1, 0);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_FCHOWN, CAP_LOOKUP);
+ EXPECT_OK(unlinkat(dirfd, "cap_fchownat", 0));
+
+ rc = openat(dirfd, "cap_fchmodat", O_CREAT, 0600);
+ EXPECT_OK(rc);
+ EXPECT_OK(close(rc));
+ rc = fchmodat(dfd_cap, "cap_fchmodat", 0600, 0);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_FCHMOD, CAP_LOOKUP);
+ EXPECT_OK(unlinkat(dirfd, "cap_fchmodat", 0));
+
+ rc = openat(dirfd, "cap_fstatat", O_CREAT, 0600);
+ EXPECT_OK(rc);
+ EXPECT_OK(close(rc));
+ struct stat sb;
+ rc = fstatat(dfd_cap, "cap_fstatat", &sb, 0);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_FSTAT, CAP_LOOKUP);
+ EXPECT_OK(unlinkat(dirfd, "cap_fstatat", 0));
+
+ rc = openat(dirfd, "cap_futimesat", O_CREAT, 0600);
+ EXPECT_OK(rc);
+ EXPECT_OK(close(rc));
+ rc = futimesat(dfd_cap, "cap_futimesat", NULL);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_FUTIMES, CAP_LOOKUP);
+ EXPECT_OK(unlinkat(dirfd, "cap_futimesat", 0));
+
+ // For linkat(2), need:
+ // - CAP_LINKAT_SOURCE on source
+ // - CAP_LINKAT_TARGET on destination.
+ rc = openat(dirfd, "cap_linkat_src", O_CREAT, 0600);
+ EXPECT_OK(rc);
+ EXPECT_OK(close(rc));
+
+ rc = linkat(dirfd, "cap_linkat_src", dfd_cap, "cap_linkat_dst", 0);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_LINKAT_TARGET);
+ if (rc >= 0) {
+ EXPECT_OK(unlinkat(dirfd, "cap_linkat_dst", 0));
+ }
+
+ rc = linkat(dfd_cap, "cap_linkat_src", dirfd, "cap_linkat_dst", 0);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_LINKAT_SOURCE);
+ if (rc >= 0) {
+ EXPECT_OK(unlinkat(dirfd, "cap_linkat_dst", 0));
+ }
+
+ EXPECT_OK(unlinkat(dirfd, "cap_linkat_src", 0));
+
+ rc = mkdirat(dfd_cap, "cap_mkdirat", 0700);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_MKDIRAT, CAP_LOOKUP);
+ if (rc >= 0) {
+ EXPECT_OK(unlinkat(dirfd, "cap_mkdirat", AT_REMOVEDIR));
+ }
+
+#ifdef HAVE_MKFIFOAT
+ rc = mkfifoat(dfd_cap, "cap_mkfifoat", 0600);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_MKFIFOAT, CAP_LOOKUP);
+ if (rc >= 0) {
+ EXPECT_OK(unlinkat(dirfd, "cap_mkfifoat", 0));
+ }
+#endif
+
+ if (getuid() == 0) {
+ rc = mknodat(dfd_cap, "cap_mknodat", S_IFCHR | 0600, 0);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_MKNODAT, CAP_LOOKUP);
+ if (rc >= 0) {
+ EXPECT_OK(unlinkat(dirfd, "cap_mknodat", 0));
+ }
+ }
+
+ // For renameat(2), need:
+ // - CAP_RENAMEAT_SOURCE on source
+ // - CAP_RENAMEAT_TARGET on destination.
+ rc = openat(dirfd, "cap_renameat_src", O_CREAT, 0600);
+ EXPECT_OK(rc);
+ EXPECT_OK(close(rc));
+
+ rc = renameat(dirfd, "cap_renameat_src", dfd_cap, "cap_renameat_dst");
+ CHECK_RIGHT_RESULT(rc, rights, CAP_RENAMEAT_TARGET);
+ if (rc >= 0) {
+ EXPECT_OK(unlinkat(dirfd, "cap_renameat_dst", 0));
+ } else {
+ EXPECT_OK(unlinkat(dirfd, "cap_renameat_src", 0));
+ }
+
+ rc = openat(dirfd, "cap_renameat_src", O_CREAT, 0600);
+ EXPECT_OK(rc);
+ EXPECT_OK(close(rc));
+
+ rc = renameat(dfd_cap, "cap_renameat_src", dirfd, "cap_renameat_dst");
+ CHECK_RIGHT_RESULT(rc, rights, CAP_RENAMEAT_SOURCE);
+
+ if (rc >= 0) {
+ EXPECT_OK(unlinkat(dirfd, "cap_renameat_dst", 0));
+ } else {
+ EXPECT_OK(unlinkat(dirfd, "cap_renameat_src", 0));
+ }
+
+ rc = symlinkat("test", dfd_cap, "cap_symlinkat");
+ CHECK_RIGHT_RESULT(rc, rights, CAP_SYMLINKAT, CAP_LOOKUP);
+ if (rc >= 0) {
+ EXPECT_OK(unlinkat(dirfd, "cap_symlinkat", 0));
+ }
+
+ rc = openat(dirfd, "cap_unlinkat", O_CREAT, 0600);
+ EXPECT_OK(rc);
+ EXPECT_OK(close(rc));
+ rc = unlinkat(dfd_cap, "cap_unlinkat", 0);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_UNLINKAT, CAP_LOOKUP);
+ unlinkat(dirfd, "cap_unlinkat", 0);
+ EXPECT_OK(mkdirat(dirfd, "cap_unlinkat", 0700));
+ rc = unlinkat(dfd_cap, "cap_unlinkat", AT_REMOVEDIR);
+ CHECK_RIGHT_RESULT(rc, rights, CAP_UNLINKAT, CAP_LOOKUP);
+ unlinkat(dirfd, "cap_unlinkat", AT_REMOVEDIR);
+
+ EXPECT_OK(close(dfd_cap));
+}
+
+void DirOperationsTest(int extra) {
+ int rc = mkdir(TmpFile("cap_dirops"), 0755);
+ EXPECT_OK(rc);
+ if (rc < 0 && errno != EEXIST) return;
+ int dfd = open(TmpFile("cap_dirops"), O_RDONLY | O_DIRECTORY | extra);
+ EXPECT_OK(dfd);
+ int tmpfd = open(tmpdir.c_str(), O_RDONLY | O_DIRECTORY);
+ EXPECT_OK(tmpfd);
+
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+
+ TRY_DIR_OPS(dfd, CAP_LINKAT_SOURCE);
+ TRY_DIR_OPS(dfd, CAP_LINKAT_TARGET);
+ TRY_DIR_OPS(dfd, CAP_CREATE, CAP_READ, CAP_LOOKUP);
+ TRY_DIR_OPS(dfd, CAP_CREATE, CAP_WRITE, CAP_LOOKUP);
+ TRY_DIR_OPS(dfd, CAP_CREATE, CAP_READ, CAP_WRITE, CAP_LOOKUP);
+ TRY_DIR_OPS(dfd, CAP_FSYNC, CAP_READ, CAP_LOOKUP);
+ TRY_DIR_OPS(dfd, CAP_FSYNC, CAP_WRITE, CAP_LOOKUP);
+ TRY_DIR_OPS(dfd, CAP_FSYNC, CAP_READ, CAP_WRITE, CAP_LOOKUP);
+ TRY_DIR_OPS(dfd, CAP_FTRUNCATE, CAP_READ, CAP_LOOKUP);
+ TRY_DIR_OPS(dfd, CAP_FTRUNCATE, CAP_WRITE, CAP_LOOKUP);
+ TRY_DIR_OPS(dfd, CAP_FTRUNCATE, CAP_READ, CAP_WRITE, CAP_LOOKUP);
+ TRY_DIR_OPS(dfd, CAP_FCHOWN, CAP_LOOKUP);
+ TRY_DIR_OPS(dfd, CAP_FCHMOD, CAP_LOOKUP);
+ TRY_DIR_OPS(dfd, CAP_FSTAT, CAP_LOOKUP);
+ TRY_DIR_OPS(dfd, CAP_FUTIMES, CAP_LOOKUP);
+ TRY_DIR_OPS(dfd, CAP_MKDIRAT, CAP_LOOKUP);
+ TRY_DIR_OPS(dfd, CAP_MKFIFOAT, CAP_LOOKUP);
+ TRY_DIR_OPS(dfd, CAP_MKNODAT, CAP_LOOKUP);
+ TRY_DIR_OPS(dfd, CAP_SYMLINKAT, CAP_LOOKUP);
+ TRY_DIR_OPS(dfd, CAP_UNLINKAT, CAP_LOOKUP);
+ // Rename needs CAP_RENAMEAT_SOURCE on source directory and
+ // CAP_RENAMEAT_TARGET on destination directory.
+ TRY_DIR_OPS(dfd, CAP_RENAMEAT_SOURCE, CAP_UNLINKAT, CAP_LOOKUP);
+ TRY_DIR_OPS(dfd, CAP_RENAMEAT_TARGET, CAP_UNLINKAT, CAP_LOOKUP);
+
+ EXPECT_OK(unlinkat(tmpfd, "cap_dirops", AT_REMOVEDIR));
+ EXPECT_OK(close(tmpfd));
+ EXPECT_OK(close(dfd));
+}
+
+FORK_TEST(Capability, DirOperations) {
+ DirOperationsTest(0);
+}
+
+#ifdef O_PATH
+FORK_TEST(Capability, PathDirOperations) {
+ // Make the dfd in the test a path-only file descriptor.
+ DirOperationsTest(O_PATH);
+}
+#endif
+
+static void TryReadWrite(int cap_fd) {
+ char buffer[64];
+ EXPECT_OK(read(cap_fd, buffer, sizeof(buffer)));
+ int rc = write(cap_fd, "", 0);
+ EXPECT_EQ(-1, rc);
+ EXPECT_EQ(ENOTCAPABLE, errno);
+}
+
+FORK_TEST_ON(Capability, SocketTransfer, TmpFile("cap_fd_transfer")) {
+ int sock_fds[2];
+ EXPECT_OK(socketpair(AF_UNIX, SOCK_STREAM, 0, sock_fds));
+
+ struct msghdr mh;
+ mh.msg_name = NULL; // No address needed
+ mh.msg_namelen = 0;
+ char buffer1[1024];
+ struct iovec iov[1];
+ iov[0].iov_base = buffer1;
+ iov[0].iov_len = sizeof(buffer1);
+ mh.msg_iov = iov;
+ mh.msg_iovlen = 1;
+ char buffer2[1024];
+ mh.msg_control = buffer2;
+ mh.msg_controllen = sizeof(buffer2);
+ struct cmsghdr *cmptr;
+
+ cap_rights_t r_rs;
+ cap_rights_init(&r_rs, CAP_READ, CAP_SEEK);
+
+ pid_t child = fork();
+ if (child == 0) {
+ // Child: enter cap mode
+ EXPECT_OK(cap_enter());
+
+ // Child: wait to receive FD over socket
+ int rc = recvmsg(sock_fds[0], &mh, 0);
+ EXPECT_OK(rc);
+ EXPECT_LE(CMSG_LEN(sizeof(int)), mh.msg_controllen);
+ cmptr = CMSG_FIRSTHDR(&mh);
+ int cap_fd = *(int*)CMSG_DATA(cmptr);
+ EXPECT_EQ(CMSG_LEN(sizeof(int)), cmptr->cmsg_len);
+ cmptr = CMSG_NXTHDR(&mh, cmptr);
+ EXPECT_TRUE(cmptr == NULL);
+
+ // Child: confirm we can do the right operations on the capability
+ cap_rights_t rights;
+ EXPECT_OK(cap_rights_get(cap_fd, &rights));
+ EXPECT_RIGHTS_EQ(&r_rs, &rights);
+ TryReadWrite(cap_fd);
+
+ // Child: wait for a normal read
+ int val;
+ read(sock_fds[0], &val, sizeof(val));
+ exit(0);
+ }
+
+ int fd = open(TmpFile("cap_fd_transfer"), O_RDWR | O_CREAT, 0644);
+ EXPECT_OK(fd);
+ if (fd < 0) return;
+ int cap_fd = dup(fd);
+ EXPECT_OK(cap_fd);
+ EXPECT_OK(cap_rights_limit(cap_fd, &r_rs));
+
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+
+ // Confirm we can do the right operations on the capability
+ TryReadWrite(cap_fd);
+
+ // Send the file descriptor over the pipe to the sub-process
+ mh.msg_controllen = CMSG_LEN(sizeof(int));
+ cmptr = CMSG_FIRSTHDR(&mh);
+ cmptr->cmsg_level = SOL_SOCKET;
+ cmptr->cmsg_type = SCM_RIGHTS;
+ cmptr->cmsg_len = CMSG_LEN(sizeof(int));
+ *(int *)CMSG_DATA(cmptr) = cap_fd;
+ buffer1[0] = 0;
+ iov[0].iov_len = 1;
+ sleep(3);
+ int rc = sendmsg(sock_fds[1], &mh, 0);
+ EXPECT_OK(rc);
+
+ sleep(1); // Ensure subprocess runs
+ int zero = 0;
+ write(sock_fds[1], &zero, sizeof(zero));
+}
+
+TEST(Capability, SyscallAt) {
+ int rc = mkdir(TmpFile("cap_at_topdir"), 0755);
+ EXPECT_OK(rc);
+ if (rc < 0 && errno != EEXIST) return;
+
+ cap_rights_t r_all;
+ cap_rights_init(&r_all, CAP_READ, CAP_LOOKUP, CAP_MKNODAT, CAP_UNLINKAT, CAP_MKDIRAT, CAP_MKFIFOAT);
+ cap_rights_t r_no_unlink;
+ cap_rights_init(&r_no_unlink, CAP_READ, CAP_LOOKUP, CAP_MKDIRAT, CAP_MKFIFOAT);
+ cap_rights_t r_no_mkdir;
+ cap_rights_init(&r_no_mkdir, CAP_READ, CAP_LOOKUP, CAP_UNLINKAT, CAP_MKFIFOAT);
+ cap_rights_t r_no_mkfifo;
+ cap_rights_init(&r_no_mkfifo, CAP_READ, CAP_LOOKUP, CAP_UNLINKAT, CAP_MKDIRAT);
+ cap_rights_t r_no_mknod;
+ cap_rights_init(&r_no_mknod, CAP_READ, CAP_LOOKUP, CAP_UNLINKAT, CAP_MKDIRAT);
+ cap_rights_t r_create;
+ cap_rights_init(&r_create, CAP_READ, CAP_LOOKUP, CAP_CREATE);
+ cap_rights_t r_bind;
+ cap_rights_init(&r_bind, CAP_READ, CAP_LOOKUP, CAP_BIND);
+
+ int dfd = open(TmpFile("cap_at_topdir"), O_RDONLY);
+ EXPECT_OK(dfd);
+ int cap_dfd_all = dup(dfd);
+ EXPECT_OK(cap_dfd_all);
+ EXPECT_OK(cap_rights_limit(cap_dfd_all, &r_all));
+ int cap_dfd_no_unlink = dup(dfd);
+ EXPECT_OK(cap_dfd_no_unlink);
+ EXPECT_OK(cap_rights_limit(cap_dfd_no_unlink, &r_no_unlink));
+ int cap_dfd_no_mkdir = dup(dfd);
+ EXPECT_OK(cap_dfd_no_mkdir);
+ EXPECT_OK(cap_rights_limit(cap_dfd_no_mkdir, &r_no_mkdir));
+ int cap_dfd_no_mkfifo = dup(dfd);
+ EXPECT_OK(cap_dfd_no_mkfifo);
+ EXPECT_OK(cap_rights_limit(cap_dfd_no_mkfifo, &r_no_mkfifo));
+ int cap_dfd_no_mknod = dup(dfd);
+ EXPECT_OK(cap_dfd_no_mknod);
+ EXPECT_OK(cap_rights_limit(cap_dfd_no_mknod, &r_no_mknod));
+ int cap_dfd_create = dup(dfd);
+ EXPECT_OK(cap_dfd_create);
+ EXPECT_OK(cap_rights_limit(cap_dfd_create, &r_create));
+ int cap_dfd_bind = dup(dfd);
+ EXPECT_OK(cap_dfd_bind);
+ EXPECT_OK(cap_rights_limit(cap_dfd_bind, &r_bind));
+
+ // Need CAP_MKDIRAT to mkdirat(2).
+ EXPECT_NOTCAPABLE(mkdirat(cap_dfd_no_mkdir, "cap_subdir", 0755));
+ rmdir(TmpFile("cap_at_topdir/cap_subdir"));
+ EXPECT_OK(mkdirat(cap_dfd_all, "cap_subdir", 0755));
+
+ // Need CAP_UNLINKAT to unlinkat(dfd, name, AT_REMOVEDIR).
+ EXPECT_NOTCAPABLE(unlinkat(cap_dfd_no_unlink, "cap_subdir", AT_REMOVEDIR));
+ EXPECT_OK(unlinkat(cap_dfd_all, "cap_subdir", AT_REMOVEDIR));
+ rmdir(TmpFile("cap_at_topdir/cap_subdir"));
+
+ // Need CAP_MKFIFOAT to mkfifoat(2).
+ EXPECT_NOTCAPABLE(mkfifoat(cap_dfd_no_mkfifo, "cap_fifo", 0755));
+ unlink(TmpFile("cap_at_topdir/cap_fifo"));
+ EXPECT_OK(mkfifoat(cap_dfd_all, "cap_fifo", 0755));
+ unlink(TmpFile("cap_at_topdir/cap_fifo"));
+
+#ifdef HAVE_MKNOD_REG
+ // Need CAP_CREATE to create a regular file with mknodat(2).
+ EXPECT_NOTCAPABLE(mknodat(cap_dfd_all, "cap_regular", S_IFREG|0755, 0));
+ unlink(TmpFile("cap_at_topdir/cap_regular"));
+ EXPECT_OK(mknodat(cap_dfd_create, "cap_regular", S_IFREG|0755, 0));
+ unlink(TmpFile("cap_at_topdir/cap_regular"));
+#endif
+
+#ifdef HAVE_MKNOD_SOCKET
+ // Need CAP_BIND to create a UNIX domain socket with mknodat(2).
+ EXPECT_NOTCAPABLE(mknodat(cap_dfd_all, "cap_socket", S_IFSOCK|0755, 0));
+ unlink(TmpFile("cap_at_topdir/cap_socket"));
+ EXPECT_OK(mknodat(cap_dfd_bind, "cap_socket", S_IFSOCK|0755, 0));
+ unlink(TmpFile("cap_at_topdir/cap_socket"));
+#endif
+
+ if (getuid() == 0) {
+ // Need CAP_MKNODAT to mknodat(2) a device
+ EXPECT_NOTCAPABLE(mknodat(cap_dfd_no_mknod, "cap_device", S_IFCHR|0755, makedev(99, 123)));
+ unlink(TmpFile("cap_at_topdir/cap_device"));
+ EXPECT_OK(mknodat(cap_dfd_all, "cap_device", S_IFCHR|0755, makedev(99, 123)));
+ unlink(TmpFile("cap_at_topdir/cap_device"));
+
+ // Need CAP_MKFIFOAT to mknodat(2) for a FIFO.
+ EXPECT_NOTCAPABLE(mknodat(cap_dfd_no_mkfifo, "cap_fifo", S_IFIFO|0755, 0));
+ unlink(TmpFile("cap_at_topdir/cap_fifo"));
+ EXPECT_OK(mknodat(cap_dfd_all, "cap_fifo", S_IFIFO|0755, 0));
+ unlink(TmpFile("cap_at_topdir/cap_fifo"));
+ } else {
+ TEST_SKIPPED("requires root (partial)");
+ }
+
+ close(cap_dfd_all);
+ close(cap_dfd_no_mknod);
+ close(cap_dfd_no_mkfifo);
+ close(cap_dfd_no_mkdir);
+ close(cap_dfd_no_unlink);
+ close(cap_dfd_create);
+ close(cap_dfd_bind);
+ close(dfd);
+
+ // Tidy up.
+ rmdir(TmpFile("cap_at_topdir"));
+}
+
+FORK_TEST_ON(Capability, ExtendedAttributes, TmpFile("cap_extattr")) {
+ int fd = open(TmpFile("cap_extattr"), O_RDONLY|O_CREAT, 0644);
+ EXPECT_OK(fd);
+
+ char buffer[1024];
+ int rc = fgetxattr_(fd, "user.capsicumtest", buffer, sizeof(buffer));
+ if (rc < 0 && errno == ENOTSUP) {
+ // Need user_xattr mount option for non-root users on Linux
+ TEST_SKIPPED("/tmp doesn't support extended attributes");
+ close(fd);
+ return;
+ }
+
+ cap_rights_t r_rws;
+ cap_rights_init(&r_rws, CAP_READ, CAP_WRITE, CAP_SEEK);
+ cap_rights_t r_xlist;
+ cap_rights_init(&r_xlist, CAP_EXTATTR_LIST);
+ cap_rights_t r_xget;
+ cap_rights_init(&r_xget, CAP_EXTATTR_GET);
+ cap_rights_t r_xset;
+ cap_rights_init(&r_xset, CAP_EXTATTR_SET);
+ cap_rights_t r_xdel;
+ cap_rights_init(&r_xdel, CAP_EXTATTR_DELETE);
+
+ int cap = dup(fd);
+ EXPECT_OK(cap);
+ EXPECT_OK(cap_rights_limit(cap, &r_rws));
+ int cap_xlist = dup(fd);
+ EXPECT_OK(cap_xlist);
+ EXPECT_OK(cap_rights_limit(cap_xlist, &r_xlist));
+ int cap_xget = dup(fd);
+ EXPECT_OK(cap_xget);
+ EXPECT_OK(cap_rights_limit(cap_xget, &r_xget));
+ int cap_xset = dup(fd);
+ EXPECT_OK(cap_xset);
+ EXPECT_OK(cap_rights_limit(cap_xset, &r_xset));
+ int cap_xdel = dup(fd);
+ EXPECT_OK(cap_xdel);
+ EXPECT_OK(cap_rights_limit(cap_xdel, &r_xdel));
+
+ const char* value = "capsicum";
+ int len = strlen(value) + 1;
+ EXPECT_NOTCAPABLE(fsetxattr_(cap, "user.capsicumtest", value, len, 0));
+ EXPECT_NOTCAPABLE(fsetxattr_(cap_xlist, "user.capsicumtest", value, len, 0));
+ EXPECT_NOTCAPABLE(fsetxattr_(cap_xget, "user.capsicumtest", value, len, 0));
+ EXPECT_NOTCAPABLE(fsetxattr_(cap_xdel, "user.capsicumtest", value, len, 0));
+ EXPECT_OK(fsetxattr_(cap_xset, "user.capsicumtest", value, len, 0));
+
+ EXPECT_NOTCAPABLE(flistxattr_(cap, buffer, sizeof(buffer)));
+ EXPECT_NOTCAPABLE(flistxattr_(cap_xget, buffer, sizeof(buffer)));
+ EXPECT_NOTCAPABLE(flistxattr_(cap_xset, buffer, sizeof(buffer)));
+ EXPECT_NOTCAPABLE(flistxattr_(cap_xdel, buffer, sizeof(buffer)));
+ EXPECT_OK(flistxattr_(cap_xlist, buffer, sizeof(buffer)));
+
+ EXPECT_NOTCAPABLE(fgetxattr_(cap, "user.capsicumtest", buffer, sizeof(buffer)));
+ EXPECT_NOTCAPABLE(fgetxattr_(cap_xlist, "user.capsicumtest", buffer, sizeof(buffer)));
+ EXPECT_NOTCAPABLE(fgetxattr_(cap_xset, "user.capsicumtest", buffer, sizeof(buffer)));
+ EXPECT_NOTCAPABLE(fgetxattr_(cap_xdel, "user.capsicumtest", buffer, sizeof(buffer)));
+ EXPECT_OK(fgetxattr_(cap_xget, "user.capsicumtest", buffer, sizeof(buffer)));
+
+ EXPECT_NOTCAPABLE(fremovexattr_(cap, "user.capsicumtest"));
+ EXPECT_NOTCAPABLE(fremovexattr_(cap_xlist, "user.capsicumtest"));
+ EXPECT_NOTCAPABLE(fremovexattr_(cap_xget, "user.capsicumtest"));
+ EXPECT_NOTCAPABLE(fremovexattr_(cap_xset, "user.capsicumtest"));
+ EXPECT_OK(fremovexattr_(cap_xdel, "user.capsicumtest"));
+
+ close(cap_xdel);
+ close(cap_xset);
+ close(cap_xget);
+ close(cap_xlist);
+ close(cap);
+ close(fd);
+}
+
+TEST(Capability, PipeUnseekable) {
+ int fds[2];
+ EXPECT_OK(pipe(fds));
+
+ // Some programs detect pipes by calling seek() and getting ESPIPE.
+ EXPECT_EQ(-1, lseek(fds[0], 0, SEEK_SET));
+ EXPECT_EQ(ESPIPE, errno);
+
+ cap_rights_t rights;
+ cap_rights_init(&rights, CAP_READ, CAP_WRITE, CAP_SEEK);
+ EXPECT_OK(cap_rights_limit(fds[0], &rights));
+
+ EXPECT_EQ(-1, lseek(fds[0], 0, SEEK_SET));
+ EXPECT_EQ(ESPIPE, errno);
+
+ // Remove CAP_SEEK and see if ENOTCAPABLE trumps ESPIPE.
+ cap_rights_init(&rights, CAP_READ, CAP_WRITE);
+ EXPECT_OK(cap_rights_limit(fds[0], &rights));
+ EXPECT_EQ(-1, lseek(fds[0], 0, SEEK_SET));
+ EXPECT_EQ(ENOTCAPABLE, errno);
+ // TODO(drysdale): in practical terms it might be nice if ESPIPE trumped ENOTCAPABLE.
+ // EXPECT_EQ(ESPIPE, errno);
+
+ close(fds[0]);
+ close(fds[1]);
+}
+
+TEST(Capability, NoBypassDAC) {
+ REQUIRE_ROOT();
+ int fd = open(TmpFile("cap_root_owned"), O_RDONLY|O_CREAT, 0644);
+ EXPECT_OK(fd);
+ cap_rights_t rights;
+ cap_rights_init(&rights, CAP_READ, CAP_WRITE, CAP_FCHMOD, CAP_FSTAT);
+ EXPECT_OK(cap_rights_limit(fd, &rights));
+
+ pid_t child = fork();
+ if (child == 0) {
+ // Child: change uid to a lesser being
+ setuid(other_uid);
+ // Attempt to fchmod the file, and fail.
+ // Having CAP_FCHMOD doesn't bypass the need to comply with DAC policy.
+ int rc = fchmod(fd, 0666);
+ EXPECT_EQ(-1, rc);
+ EXPECT_EQ(EPERM, errno);
+ exit(HasFailure());
+ }
+ int status;
+ EXPECT_EQ(child, waitpid(child, &status, 0));
+ EXPECT_TRUE(WIFEXITED(status)) << "0x" << std::hex << status;
+ EXPECT_EQ(0, WEXITSTATUS(status));
+ struct stat info;
+ EXPECT_OK(fstat(fd, &info));
+ EXPECT_EQ((mode_t)(S_IFREG|0644), info.st_mode);
+ close(fd);
+ unlink(TmpFile("cap_root_owned"));
+}
Index: contrib/capsicum-test/capmode.cc
===================================================================
--- /dev/null
+++ contrib/capsicum-test/capmode.cc
@@ -0,0 +1,654 @@
+// Test routines to make sure a variety of system calls are or are not
+// available in capability mode. The goal is not to see if they work, just
+// whether or not they return the expected ECAPMODE.
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/mount.h>
+#include <sys/mman.h>
+#include <sys/wait.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/ptrace.h>
+#include <dirent.h>
+#include <netinet/in.h>
+#include <fcntl.h>
+#include <sched.h>
+#include <time.h>
+#include <unistd.h>
+#include <pthread.h>
+
+#include "capsicum.h"
+#include "syscalls.h"
+#include "capsicum-test.h"
+
+// Test fixture that opens (and closes) a bunch of files.
+class WithFiles : public ::testing::Test {
+ public:
+ WithFiles() :
+ fd_file_(open(TmpFile("cap_capmode"), O_RDWR|O_CREAT, 0644)),
+ fd_close_(open("/dev/null", O_RDWR)),
+ fd_dir_(open(tmpdir.c_str(), O_RDONLY)),
+ fd_socket_(socket(PF_INET, SOCK_DGRAM, 0)),
+ fd_tcp_socket_(socket(PF_INET, SOCK_STREAM, 0)) {
+ EXPECT_OK(fd_file_);
+ EXPECT_OK(fd_close_);
+ EXPECT_OK(fd_dir_);
+ EXPECT_OK(fd_socket_);
+ EXPECT_OK(fd_tcp_socket_);
+ }
+ ~WithFiles() {
+ if (fd_tcp_socket_ >= 0) close(fd_tcp_socket_);
+ if (fd_socket_ >= 0) close(fd_socket_);
+ if (fd_dir_ >= 0) close(fd_dir_);
+ if (fd_close_ >= 0) close(fd_close_);
+ if (fd_file_ >= 0) close(fd_file_);
+ unlink(TmpFile("cap_capmode"));
+ }
+ protected:
+ int fd_file_;
+ int fd_close_;
+ int fd_dir_;
+ int fd_socket_;
+ int fd_tcp_socket_;
+};
+
+FORK_TEST_F(WithFiles, DisallowedFileSyscalls) {
+ unsigned int mode = -1;
+ EXPECT_OK(cap_getmode(&mode));
+ EXPECT_EQ(0, (int)mode);
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+ EXPECT_OK(cap_getmode(&mode));
+ EXPECT_EQ(1, (int)mode);
+
+ // System calls that are not permitted in capability mode.
+ EXPECT_CAPMODE(access(TmpFile("cap_capmode_access"), F_OK));
+ EXPECT_CAPMODE(acct(TmpFile("cap_capmode_acct")));
+ EXPECT_CAPMODE(chdir(TmpFile("cap_capmode_chdir")));
+#ifdef HAVE_CHFLAGS
+ EXPECT_CAPMODE(chflags(TmpFile("cap_capmode_chflags"), UF_NODUMP));
+#endif
+ EXPECT_CAPMODE(chmod(TmpFile("cap_capmode_chmod"), 0644));
+ EXPECT_CAPMODE(chown(TmpFile("cap_capmode_chown"), -1, -1));
+ EXPECT_CAPMODE(chroot(TmpFile("cap_capmode_chroot")));
+ EXPECT_CAPMODE(creat(TmpFile("cap_capmode_creat"), 0644));
+ EXPECT_CAPMODE(fchdir(fd_dir_));
+#ifdef HAVE_GETFSSTAT
+ struct statfs statfs;
+ EXPECT_CAPMODE(getfsstat(&statfs, sizeof(statfs), MNT_NOWAIT));
+#endif
+ EXPECT_CAPMODE(link(TmpFile("foo"), TmpFile("bar")));
+ struct stat sb;
+ EXPECT_CAPMODE(lstat(TmpFile("cap_capmode_lstat"), &sb));
+ EXPECT_CAPMODE(mknod(TmpFile("capmode_mknod"), 0644 | S_IFIFO, 0));
+ EXPECT_CAPMODE(bogus_mount_());
+ EXPECT_CAPMODE(open("/dev/null", O_RDWR));
+ char buf[64];
+ EXPECT_CAPMODE(readlink(TmpFile("cap_capmode_readlink"), buf, sizeof(buf)));
+#ifdef HAVE_REVOKE
+ EXPECT_CAPMODE(revoke(TmpFile("cap_capmode_revoke")));
+#endif
+ EXPECT_CAPMODE(stat(TmpFile("cap_capmode_stat"), &sb));
+ EXPECT_CAPMODE(symlink(TmpFile("cap_capmode_symlink_from"), TmpFile("cap_capmode_symlink_to")));
+ EXPECT_CAPMODE(unlink(TmpFile("cap_capmode_unlink")));
+ EXPECT_CAPMODE(umount2("/not_mounted", 0));
+}
+
+FORK_TEST_F(WithFiles, DisallowedSocketSyscalls) {
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+
+ // System calls that are not permitted in capability mode.
+ struct sockaddr_in addr;
+ addr.sin_family = AF_INET;
+ addr.sin_port = 0;
+ addr.sin_addr.s_addr = htonl(INADDR_ANY);
+ EXPECT_CAPMODE(bind_(fd_socket_, (sockaddr*)&addr, sizeof(addr)));
+ addr.sin_family = AF_INET;
+ addr.sin_port = 53;
+ addr.sin_addr.s_addr = htonl(0x08080808);
+ EXPECT_CAPMODE(connect_(fd_tcp_socket_, (sockaddr*)&addr, sizeof(addr)));
+}
+
+FORK_TEST_F(WithFiles, AllowedFileSyscalls) {
+ int rc;
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+
+ EXPECT_OK(close(fd_close_));
+ fd_close_ = -1;
+ int fd_dup = dup(fd_file_);
+ EXPECT_OK(fd_dup);
+ EXPECT_OK(dup2(fd_file_, fd_dup));
+#ifdef HAVE_DUP3
+ EXPECT_OK(dup3(fd_file_, fd_dup, 0));
+#endif
+ if (fd_dup >= 0) close(fd_dup);
+
+ struct stat sb;
+ EXPECT_OK(fstat(fd_file_, &sb));
+ EXPECT_OK(lseek(fd_file_, 0, SEEK_SET));
+ char ch;
+ EXPECT_OK(read(fd_file_, &ch, sizeof(ch)));
+ EXPECT_OK(write(fd_file_, &ch, sizeof(ch)));
+
+#ifdef HAVE_CHFLAGS
+ rc = fchflags(fd_file_, UF_NODUMP);
+ if (rc < 0) {
+ EXPECT_NE(ECAPMODE, errno);
+ }
+#endif
+
+ char buf[1024];
+ rc = getdents_(fd_dir_, (void*)buf, sizeof(buf));
+ EXPECT_OK(rc);
+
+ char data[] = "123";
+ EXPECT_OK(pwrite(fd_file_, data, 1, 0));
+ EXPECT_OK(pread(fd_file_, data, 1, 0));
+
+ struct iovec io;
+ io.iov_base = data;
+ io.iov_len = 2;
+#if !defined(__i386__) && !defined(__linux__)
+ // TODO(drysdale): reinstate these tests for 32-bit runs when possible
+ // libc bug is fixed.
+ EXPECT_OK(pwritev(fd_file_, &io, 1, 0));
+ EXPECT_OK(preadv(fd_file_, &io, 1, 0));
+#endif
+ EXPECT_OK(writev(fd_file_, &io, 1));
+ EXPECT_OK(readv(fd_file_, &io, 1));
+
+#ifdef HAVE_SYNCFS
+ EXPECT_OK(syncfs(fd_file_));
+#endif
+#ifdef HAVE_SYNC_FILE_RANGE
+ EXPECT_OK(sync_file_range(fd_file_, 0, 1, 0));
+#endif
+#ifdef HAVE_READAHEAD
+ if (!tmpdir_on_tmpfs) { // tmpfs doesn't support readahead(2)
+ EXPECT_OK(readahead(fd_file_, 0, 1));
+ }
+#endif
+}
+
+FORK_TEST_F(WithFiles, AllowedSocketSyscalls) {
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+
+ // recvfrom() either returns -1 with EAGAIN, or 0.
+ int rc = recvfrom(fd_socket_, NULL, 0, MSG_DONTWAIT, NULL, NULL);
+ if (rc < 0) {
+ EXPECT_EQ(EAGAIN, errno);
+ }
+ char ch;
+ EXPECT_OK(write(fd_file_, &ch, sizeof(ch)));
+
+ // These calls will fail for lack of e.g. a proper name to send to,
+ // but they are allowed in capability mode, so errno != ECAPMODE.
+ EXPECT_FAIL_NOT_CAPMODE(accept(fd_socket_, NULL, NULL));
+ EXPECT_FAIL_NOT_CAPMODE(getpeername(fd_socket_, NULL, NULL));
+ EXPECT_FAIL_NOT_CAPMODE(getsockname(fd_socket_, NULL, NULL));
+ EXPECT_FAIL_NOT_CAPMODE(recvmsg(fd_socket_, NULL, 0));
+ EXPECT_FAIL_NOT_CAPMODE(sendmsg(fd_socket_, NULL, 0));
+ EXPECT_FAIL_NOT_CAPMODE(sendto(fd_socket_, NULL, 0, 0, NULL, 0));
+ off_t offset = 0;
+ EXPECT_FAIL_NOT_CAPMODE(sendfile_(fd_socket_, fd_file_, &offset, 1));
+
+ // The socket/socketpair syscalls are allowed, but they don't give
+ // anything externally useful (can't call bind/connect on them).
+ int fd_socket2 = socket(PF_INET, SOCK_DGRAM, 0);
+ EXPECT_OK(fd_socket2);
+ if (fd_socket2 >= 0) close(fd_socket2);
+ int fd_pair[2] = {-1, -1};
+ EXPECT_OK(socketpair(AF_UNIX, SOCK_STREAM, 0, fd_pair));
+ if (fd_pair[0] >= 0) close(fd_pair[0]);
+ if (fd_pair[1] >= 0) close(fd_pair[1]);
+}
+
+#ifdef HAVE_SEND_RECV_MMSG
+FORK_TEST(Capmode, AllowedMmsgSendRecv) {
+ int fd_socket = socket(PF_INET, SOCK_DGRAM, 0);
+
+ struct sockaddr_in addr;
+ addr.sin_family = AF_INET;
+ addr.sin_port = htons(0);
+ addr.sin_addr.s_addr = htonl(INADDR_ANY);
+ EXPECT_OK(bind(fd_socket, (sockaddr*)&addr, sizeof(addr)));
+
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+
+ char buffer[256] = {0};
+ struct iovec iov;
+ iov.iov_base = buffer;
+ iov.iov_len = sizeof(buffer);
+ struct mmsghdr mm;
+ memset(&mm, 0, sizeof(mm));
+ mm.msg_hdr.msg_iov = &iov;
+ mm.msg_hdr.msg_iovlen = 1;
+ struct timespec ts;
+ ts.tv_sec = 1;
+ ts.tv_nsec = 100;
+ EXPECT_FAIL_NOT_CAPMODE(recvmmsg(fd_socket, &mm, 1, MSG_DONTWAIT, &ts));
+ EXPECT_FAIL_NOT_CAPMODE(sendmmsg(fd_socket, &mm, 1, 0));
+ close(fd_socket);
+}
+#endif
+
+FORK_TEST(Capmode, AllowedIdentifierSyscalls) {
+ // Record some identifiers
+ gid_t my_gid = getgid();
+ pid_t my_pid = getpid();
+ pid_t my_ppid = getppid();
+ uid_t my_uid = getuid();
+ pid_t my_sid = getsid(my_pid);
+
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+
+ EXPECT_EQ(my_gid, getegid_());
+ EXPECT_EQ(my_uid, geteuid_());
+ EXPECT_EQ(my_gid, getgid_());
+ EXPECT_EQ(my_pid, getpid());
+ EXPECT_EQ(my_ppid, getppid());
+ EXPECT_EQ(my_uid, getuid_());
+ EXPECT_EQ(my_sid, getsid(my_pid));
+ gid_t grps[128];
+ EXPECT_OK(getgroups_(128, grps));
+ uid_t ruid;
+ uid_t euid;
+ uid_t suid;
+ EXPECT_OK(getresuid(&ruid, &euid, &suid));
+ gid_t rgid;
+ gid_t egid;
+ gid_t sgid;
+ EXPECT_OK(getresgid(&rgid, &egid, &sgid));
+#ifdef HAVE_GETLOGIN
+ EXPECT_TRUE(getlogin() != NULL);
+#endif
+
+ // Set various identifiers (to their existing values).
+ EXPECT_OK(setgid(my_gid));
+#ifdef HAVE_SETFSGID
+ EXPECT_OK(setfsgid(my_gid));
+#endif
+ EXPECT_OK(setuid(my_uid));
+#ifdef HAVE_SETFSUID
+ EXPECT_OK(setfsuid(my_uid));
+#endif
+ EXPECT_OK(setregid(my_gid, my_gid));
+ EXPECT_OK(setresgid(my_gid, my_gid, my_gid));
+ EXPECT_OK(setreuid(my_uid, my_uid));
+ EXPECT_OK(setresuid(my_uid, my_uid, my_uid));
+ EXPECT_OK(setsid());
+}
+
+FORK_TEST(Capmode, AllowedSchedSyscalls) {
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+ int policy = sched_getscheduler(0);
+ EXPECT_OK(policy);
+ struct sched_param sp;
+ EXPECT_OK(sched_getparam(0, &sp));
+ if (policy >= 0 && (!SCHED_SETSCHEDULER_REQUIRES_ROOT || getuid() == 0)) {
+ EXPECT_OK(sched_setscheduler(0, policy, &sp));
+ }
+ EXPECT_OK(sched_setparam(0, &sp));
+ EXPECT_OK(sched_get_priority_max(policy));
+ EXPECT_OK(sched_get_priority_min(policy));
+ struct timespec ts;
+ EXPECT_OK(sched_rr_get_interval(0, &ts));
+ EXPECT_OK(sched_yield());
+}
+
+
+FORK_TEST(Capmode, AllowedTimerSyscalls) {
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+ struct timespec ts;
+ EXPECT_OK(clock_getres(CLOCK_REALTIME, &ts));
+ EXPECT_OK(clock_gettime(CLOCK_REALTIME, &ts));
+ struct itimerval itv;
+ EXPECT_OK(getitimer(ITIMER_REAL, &itv));
+ EXPECT_OK(setitimer(ITIMER_REAL, &itv, NULL));
+ struct timeval tv;
+ struct timezone tz;
+ EXPECT_OK(gettimeofday(&tv, &tz));
+ ts.tv_sec = 0;
+ ts.tv_nsec = 1;
+ EXPECT_OK(nanosleep(&ts, NULL));
+}
+
+
+FORK_TEST(Capmode, AllowedProfilSyscall) {
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+ char sbuf[32];
+ EXPECT_OK(profil((profil_arg1_t*)sbuf, sizeof(sbuf), 0, 1));
+}
+
+
+FORK_TEST(Capmode, AllowedResourceSyscalls) {
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+ errno = 0;
+ int rc = getpriority(PRIO_PROCESS, 0);
+ EXPECT_EQ(0, errno);
+ EXPECT_OK(setpriority(PRIO_PROCESS, 0, rc));
+ struct rlimit rlim;
+ EXPECT_OK(getrlimit_(RLIMIT_CORE, &rlim));
+ EXPECT_OK(setrlimit(RLIMIT_CORE, &rlim));
+ struct rusage ruse;
+ EXPECT_OK(getrusage(RUSAGE_SELF, &ruse));
+}
+
+FORK_TEST(CapMode, AllowedMmapSyscalls) {
+ // mmap() some memory.
+ size_t mem_size = getpagesize();
+ void *mem = mmap(NULL, mem_size, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
+ EXPECT_TRUE(mem != NULL);
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+
+ EXPECT_OK(msync(mem, mem_size, MS_ASYNC));
+ EXPECT_OK(madvise(mem, mem_size, MADV_NORMAL));
+ unsigned char vec[2];
+ EXPECT_OK(mincore_(mem, mem_size, vec));
+ EXPECT_OK(mprotect(mem, mem_size, PROT_READ|PROT_WRITE));
+
+ if (!MLOCK_REQUIRES_ROOT || getuid() == 0) {
+ EXPECT_OK(mlock(mem, mem_size));
+ EXPECT_OK(munlock(mem, mem_size));
+ int rc = mlockall(MCL_CURRENT);
+ if (rc != 0) {
+ // mlockall may well fail with ENOMEM for non-root users, as the
+ // default RLIMIT_MEMLOCK value isn't that big.
+ EXPECT_NE(ECAPMODE, errno);
+ }
+ EXPECT_OK(munlockall());
+ }
+ // Unmap the memory.
+ EXPECT_OK(munmap(mem, mem_size));
+}
+
+FORK_TEST(Capmode, AllowedPipeSyscalls) {
+ EXPECT_OK(cap_enter()); // Enter capability mode
+ int fd2[2];
+ int rc = pipe(fd2);
+ EXPECT_EQ(0, rc);
+
+#ifdef HAVE_VMSPLICE
+ char buf[11] = "0123456789";
+ struct iovec iov;
+ iov.iov_base = buf;
+ iov.iov_len = sizeof(buf);
+ EXPECT_FAIL_NOT_CAPMODE(vmsplice(fd2[0], &iov, 1, SPLICE_F_NONBLOCK));
+#endif
+
+ if (rc == 0) {
+ close(fd2[0]);
+ close(fd2[1]);
+ };
+#ifdef HAVE_PIPE2
+ rc = pipe2(fd2, 0);
+ EXPECT_EQ(0, rc);
+ if (rc == 0) {
+ close(fd2[0]);
+ close(fd2[1]);
+ };
+#endif
+}
+
+TEST(Capmode, AllowedAtSyscalls) {
+ int rc = mkdir(TmpFile("cap_at_syscalls"), 0755);
+ EXPECT_OK(rc);
+ if (rc < 0 && errno != EEXIST) return;
+ int dfd = open(TmpFile("cap_at_syscalls"), O_RDONLY);
+ EXPECT_OK(dfd);
+
+ int file = openat(dfd, "testfile", O_RDONLY|O_CREAT, 0644);
+ EXPECT_OK(file);
+ EXPECT_OK(close(file));
+
+
+ pid_t child = fork();
+ if (child == 0) {
+ // Child: enter cap mode and run tests
+ EXPECT_OK(cap_enter()); // Enter capability mode
+
+ struct stat fs;
+ EXPECT_OK(fstatat(dfd, "testfile", &fs, 0));
+ EXPECT_OK(mkdirat(dfd, "subdir", 0600));
+ EXPECT_OK(fchmodat(dfd, "subdir", 0644, 0));
+ EXPECT_OK(faccessat(dfd, "subdir", F_OK, 0));
+ EXPECT_OK(renameat(dfd, "subdir", dfd, "subdir2"));
+ EXPECT_OK(renameat(dfd, "subdir2", dfd, "subdir"));
+ struct timeval tv[2];
+ struct timezone tz;
+ EXPECT_OK(gettimeofday(&tv[0], &tz));
+ EXPECT_OK(gettimeofday(&tv[1], &tz));
+ EXPECT_OK(futimesat(dfd, "testfile", tv));
+
+ EXPECT_OK(fchownat(dfd, "testfile", fs.st_uid, fs.st_gid, 0));
+ EXPECT_OK(linkat(dfd, "testfile", dfd, "linky", 0));
+ EXPECT_OK(symlinkat("testfile", dfd, "symlink"));
+ char buffer[256];
+ EXPECT_OK(readlinkat(dfd, "symlink", buffer, sizeof(buffer)));
+ EXPECT_OK(unlinkat(dfd, "linky", 0));
+ EXPECT_OK(unlinkat(dfd, "subdir", AT_REMOVEDIR));
+
+ // Check that invalid requests get a non-Capsicum errno.
+ errno = 0;
+ rc = readlinkat(-1, "symlink", buffer, sizeof(buffer));
+ EXPECT_GE(0, rc);
+ EXPECT_NE(ECAPMODE, errno);
+
+ exit(HasFailure());
+ }
+
+ // Wait for the child.
+ int status;
+ EXPECT_EQ(child, waitpid(child, &status, 0));
+ rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
+ EXPECT_EQ(0, rc);
+
+ // Tidy up.
+ close(dfd);
+ rmdir(TmpFile("cap_at_syscalls/subdir"));
+ unlink(TmpFile("cap_at_syscalls/symlink"));
+ unlink(TmpFile("cap_at_syscalls/linky"));
+ unlink(TmpFile("cap_at_syscalls/testfile"));
+ rmdir(TmpFile("cap_at_syscalls"));
+}
+
+TEST(Capmode, AllowedAtSyscallsCwd) {
+ int rc = mkdir(TmpFile("cap_at_syscalls_cwd"), 0755);
+ EXPECT_OK(rc);
+ if (rc < 0 && errno != EEXIST) return;
+ int dfd = open(TmpFile("cap_at_syscalls_cwd"), O_RDONLY);
+ EXPECT_OK(dfd);
+
+ int file = openat(dfd, "testfile", O_RDONLY|O_CREAT, 0644);
+ EXPECT_OK(file);
+ EXPECT_OK(close(file));
+
+ pid_t child = fork();
+ if (child == 0) {
+ // Child: move into temp dir, enter cap mode and run tests
+ EXPECT_OK(fchdir(dfd));
+ EXPECT_OK(cap_enter()); // Enter capability mode
+
+ // Test that *at(AT_FDCWD, path,...) is policed with ECAPMODE.
+ EXPECT_CAPMODE(openat(AT_FDCWD, "testfile", O_RDONLY));
+ struct stat fs;
+ EXPECT_CAPMODE(fstatat(AT_FDCWD, "testfile", &fs, 0));
+ EXPECT_CAPMODE(mkdirat(AT_FDCWD, "subdir", 0600));
+ EXPECT_CAPMODE(fchmodat(AT_FDCWD, "subdir", 0644, 0));
+ EXPECT_CAPMODE(faccessat(AT_FDCWD, "subdir", F_OK, 0));
+ EXPECT_CAPMODE(renameat(AT_FDCWD, "subdir", AT_FDCWD, "subdir2"));
+ EXPECT_CAPMODE(renameat(AT_FDCWD, "subdir2", AT_FDCWD, "subdir"));
+ struct timeval tv[2];
+ struct timezone tz;
+ EXPECT_OK(gettimeofday(&tv[0], &tz));
+ EXPECT_OK(gettimeofday(&tv[1], &tz));
+ EXPECT_CAPMODE(futimesat(AT_FDCWD, "testfile", tv));
+
+ EXPECT_CAPMODE(fchownat(AT_FDCWD, "testfile", fs.st_uid, fs.st_gid, 0));
+ EXPECT_CAPMODE(linkat(AT_FDCWD, "testfile", AT_FDCWD, "linky", 0));
+ EXPECT_CAPMODE(symlinkat("testfile", AT_FDCWD, "symlink"));
+ char buffer[256];
+ EXPECT_CAPMODE(readlinkat(AT_FDCWD, "symlink", buffer, sizeof(buffer)));
+ EXPECT_CAPMODE(unlinkat(AT_FDCWD, "linky", 0));
+
+ exit(HasFailure());
+ }
+
+ // Wait for the child.
+ int status;
+ EXPECT_EQ(child, waitpid(child, &status, 0));
+ rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
+ EXPECT_EQ(0, rc);
+
+ // Tidy up.
+ close(dfd);
+ rmdir(TmpFile("cap_at_syscalls_cwd/subdir"));
+ unlink(TmpFile("cap_at_syscalls_cwd/symlink"));
+ unlink(TmpFile("cap_at_syscalls_cwd/linky"));
+ unlink(TmpFile("cap_at_syscalls_cwd/testfile"));
+ rmdir(TmpFile("cap_at_syscalls_cwd"));
+}
+
+TEST(Capmode, Abort) {
+ // Check that abort(3) works even in capability mode.
+ pid_t child = fork();
+ if (child == 0) {
+ // Child: enter capability mode and call abort(3).
+ // Triggers something like kill(getpid(), SIGABRT).
+ cap_enter(); // Enter capability mode.
+ abort();
+ exit(99);
+ }
+ int status;
+ EXPECT_EQ(child, waitpid(child, &status, 0));
+ EXPECT_TRUE(WIFSIGNALED(status)) << " status = " << std::hex << status;
+ EXPECT_EQ(SIGABRT, WTERMSIG(status)) << " status = " << std::hex << status;
+}
+
+FORK_TEST_F(WithFiles, AllowedMiscSyscalls) {
+ umask(022);
+ mode_t um_before = umask(022);
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+
+ mode_t um = umask(022);
+ EXPECT_NE(-ECAPMODE, (int)um);
+ EXPECT_EQ(um_before, um);
+ stack_t ss;
+ EXPECT_OK(sigaltstack(NULL, &ss));
+
+ // Finally, tests for system calls that don't fit the pattern very well.
+ pid_t pid = fork();
+ EXPECT_OK(pid);
+ if (pid == 0) {
+ // Child: almost immediately exit.
+ sleep(1);
+ exit(0);
+ } else if (pid > 0) {
+ errno = 0;
+ EXPECT_CAPMODE(ptrace_(PTRACE_PEEKDATA_, pid, &pid, NULL));
+ EXPECT_CAPMODE(waitpid(pid, NULL, 0));
+ }
+
+ // No error return from sync(2) to test, but check errno remains unset.
+ errno = 0;
+ sync();
+ EXPECT_EQ(0, errno);
+
+ // TODO(FreeBSD): ktrace
+
+#ifdef HAVE_SYSARCH
+ // sysarch() is, by definition, architecture-dependent
+#if defined (__amd64__) || defined (__i386__)
+ long sysarch_arg = 0;
+ EXPECT_CAPMODE(sysarch(I386_SET_IOPERM, &sysarch_arg));
+#else
+ // TOOD(jra): write a test for other architectures, like arm
+#endif
+#endif
+}
+
+void *thread_fn(void *p) {
+ int delay = *(int *)p;
+ sleep(delay);
+ EXPECT_OK(getpid_());
+ EXPECT_CAPMODE(open("/dev/null", O_RDWR));
+ return NULL;
+}
+
+// Check that restrictions are the same in subprocesses and threads
+FORK_TEST(Capmode, NewThread) {
+ // Fire off a new thread before entering capability mode
+ pthread_t early_thread;
+ int one = 1; // second
+ EXPECT_OK(pthread_create(&early_thread, NULL, thread_fn, &one));
+
+ // Fire off a new process before entering capability mode.
+ int early_child = fork();
+ EXPECT_OK(early_child);
+ if (early_child == 0) {
+ // Child: wait and then confirm this process is unaffect by capability mode in the parent.
+ sleep(1);
+ int fd = open("/dev/null", O_RDWR);
+ EXPECT_OK(fd);
+ close(fd);
+ exit(0);
+ }
+
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+ // Do an allowed syscall.
+ EXPECT_OK(getpid_());
+ int child = fork();
+ EXPECT_OK(child);
+ if (child == 0) {
+ // Child: do an allowed and a disallowed syscall.
+ EXPECT_OK(getpid_());
+ EXPECT_CAPMODE(open("/dev/null", O_RDWR));
+ exit(0);
+ }
+ // Don't (can't) wait for either child.
+
+ // Wait for the early-started thread.
+ EXPECT_OK(pthread_join(early_thread, NULL));
+
+ // Fire off a new thread.
+ pthread_t child_thread;
+ int zero = 0; // seconds
+ EXPECT_OK(pthread_create(&child_thread, NULL, thread_fn, &zero));
+ EXPECT_OK(pthread_join(child_thread, NULL));
+
+ // Fork a subprocess which fires off a new thread.
+ child = fork();
+ EXPECT_OK(child);
+ if (child == 0) {
+ pthread_t child_thread2;
+ EXPECT_OK(pthread_create(&child_thread2, NULL, thread_fn, &zero));
+ EXPECT_OK(pthread_join(child_thread2, NULL));
+ exit(0);
+ }
+ // Sleep for a bit to allow the subprocess to finish.
+ sleep(2);
+}
+
+static int had_signal = 0;
+static void handle_signal(int) { had_signal = 1; }
+
+FORK_TEST(Capmode, SelfKill) {
+ pid_t me = getpid();
+ sighandler_t original = signal(SIGUSR1, handle_signal);
+
+ pid_t child = fork();
+ if (child == 0) {
+ // Child: sleep and exit
+ sleep(1);
+ exit(0);
+ }
+
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+
+ // Can only kill(2) to own pid.
+ EXPECT_CAPMODE(kill(child, SIGUSR1));
+ EXPECT_OK(kill(me, SIGUSR1));
+ EXPECT_EQ(1, had_signal);
+
+ signal(SIGUSR1, original);
+}
Index: contrib/capsicum-test/capsicum-freebsd.h
===================================================================
--- /dev/null
+++ contrib/capsicum-test/capsicum-freebsd.h
@@ -0,0 +1,73 @@
+#ifndef __CAPSICUM_FREEBSD_H__
+#define __CAPSICUM_FREEBSD_H__
+#ifdef __FreeBSD__
+/************************************************************
+ * FreeBSD Capsicum Functionality.
+ ************************************************************/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* FreeBSD definitions. */
+#include <errno.h>
+#include <sys/param.h>
+#if __FreeBSD_version >= 1100014 || \
+ (__FreeBSD_version >= 1001511 && __FreeBSD_version < 1100000)
+#include <sys/capsicum.h>
+#else
+#include <sys/capability.h>
+#endif
+#include <sys/procdesc.h>
+
+#if __FreeBSD_version >= 1000000
+#define AT_SYSCALLS_IN_CAPMODE
+#define HAVE_CAP_RIGHTS_GET
+#define HAVE_CAP_RIGHTS_LIMIT
+#define HAVE_PROCDESC_FSTAT
+#define HAVE_CAP_FCNTLS_LIMIT
+// fcntl(2) takes int, cap_fcntls_limit(2) takes uint32_t.
+typedef uint32_t cap_fcntl_t;
+#define HAVE_CAP_IOCTLS_LIMIT
+// ioctl(2) and cap_ioctls_limit(2) take unsigned long.
+typedef unsigned long cap_ioctl_t;
+
+#if __FreeBSD_version >= 1101000
+#define HAVE_OPENAT_INTERMEDIATE_DOTDOT
+#endif
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+// Use fexecve_() in tests to allow Linux variant to bypass glibc version.
+#define fexecve_(F, A, E) fexecve(F, A, E)
+
+#ifdef ENOTBENEATH
+#define E_NO_TRAVERSE_CAPABILITY ENOTBENEATH
+#define E_NO_TRAVERSE_O_BENEATH ENOTBENEATH
+#else
+#define E_NO_TRAVERSE_CAPABILITY ENOTCAPABLE
+#define E_NO_TRAVERSE_O_BENEATH ENOTCAPABLE
+#endif
+
+// FreeBSD limits the number of ioctls in cap_ioctls_limit to 256
+#define CAP_IOCTLS_LIMIT_MAX 256
+
+// Too many links
+#define E_TOO_MANY_LINKS EMLINK
+
+// TODO(FreeBSD): uncomment if/when FreeBSD propagates rights on accept.
+// FreeBSD does not generate a capability from accept(cap_fd,...).
+// https://bugs.freebsd.org/201052
+// #define CAP_FROM_ACCEPT
+// TODO(FreeBSD): uncomment if/when FreeBSD propagates rights on sctp_peeloff.
+// FreeBSD does not generate a capability from sctp_peeloff(cap_fd,...).
+// https://bugs.freebsd.org/201052
+// #define CAP_FROM_PEELOFF
+
+#endif /* __FreeBSD__ */
+
+#endif /*__CAPSICUM_FREEBSD_H__*/
Index: contrib/capsicum-test/capsicum-linux.h
===================================================================
--- /dev/null
+++ contrib/capsicum-test/capsicum-linux.h
@@ -0,0 +1,40 @@
+#ifndef __CAPSICUM_LINUX_H__
+#define __CAPSICUM_LINUX_H__
+
+#ifdef __linux__
+/************************************************************
+ * Linux Capsicum Functionality.
+ ************************************************************/
+#include <errno.h>
+#include <sys/procdesc.h>
+#include <sys/capsicum.h>
+
+#define HAVE_CAP_RIGHTS_LIMIT
+#define HAVE_CAP_RIGHTS_GET
+#define HAVE_CAP_FCNTLS_LIMIT
+#define HAVE_CAP_IOCTLS_LIMIT
+#define HAVE_PROC_FDINFO
+#define HAVE_PDWAIT4
+#define CAP_FROM_ACCEPT
+// TODO(drysdale): uncomment if/when Linux propagates rights on sctp_peeloff.
+// Linux does not generate a capability from sctp_peeloff(cap_fd,...).
+// #define CAP_FROM_PEELOFF
+// TODO(drysdale): uncomment if/when Linux allows intermediate .. path segments
+// for openat()-like operations.
+// #define HAVE_OPENAT_INTERMEDIATE_DOTDOT
+
+// Failure to open file due to path traversal generates EPERM
+#ifdef ENOTBENEATH
+#define E_NO_TRAVERSE_CAPABILITY ENOTBENEATH
+#define E_NO_TRAVERSE_O_BENEATH ENOTBENEATH
+#else
+#define E_NO_TRAVERSE_CAPABILITY EPERM
+#define E_NO_TRAVERSE_O_BENEATH EPERM
+#endif
+
+// Too many links
+#define E_TOO_MANY_LINKS ELOOP
+
+#endif /* __linux__ */
+
+#endif /*__CAPSICUM_LINUX_H__*/
Index: contrib/capsicum-test/capsicum-rights.h
===================================================================
--- /dev/null
+++ contrib/capsicum-test/capsicum-rights.h
@@ -0,0 +1,118 @@
+#ifndef __CAPSICUM_RIGHTS_H__
+#define __CAPSICUM_RIGHTS_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __FreeBSD__
+#include <sys/param.h>
+#if __FreeBSD_version >= 1100014 || \
+ (__FreeBSD_version >= 1001511 && __FreeBSD_version < 1100000)
+#include <sys/capsicum.h>
+#else
+#include <sys/capability.h>
+#endif
+#endif
+
+#ifdef __linux__
+#include <linux/capsicum.h>
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#ifndef CAP_RIGHTS_VERSION
+/************************************************************
+ * Capsicum compatibility layer: implement new (FreeBSD10.x)
+ * rights manipulation API in terms of original (FreeBSD9.x)
+ * functionality.
+ ************************************************************/
+#include <stdarg.h>
+#include <stdbool.h>
+
+/* Rights manipulation macros/functions.
+ * Note that these use variadic macros, available in C99 / C++11 (and
+ * also in earlier gcc versions).
+ */
+#define cap_rights_init(rights, ...) _cap_rights_init((rights), __VA_ARGS__, 0ULL)
+#define cap_rights_set(rights, ...) _cap_rights_set((rights), __VA_ARGS__, 0ULL)
+#define cap_rights_clear(rights, ...) _cap_rights_clear((rights), __VA_ARGS__, 0ULL)
+#define cap_rights_is_set(rights, ...) _cap_rights_is_set((rights), __VA_ARGS__, 0ULL)
+
+inline cap_rights_t* _cap_rights_init(cap_rights_t *rights, ...) {
+ va_list ap;
+ cap_rights_t right;
+ *rights = 0;
+ va_start(ap, rights);
+ while (true) {
+ right = va_arg(ap, cap_rights_t);
+ *rights |= right;
+ if (right == 0) break;
+ }
+ va_end(ap);
+ return rights;
+}
+
+inline cap_rights_t* _cap_rights_set(cap_rights_t *rights, ...) {
+ va_list ap;
+ cap_rights_t right;
+ va_start(ap, rights);
+ while (true) {
+ right = va_arg(ap, cap_rights_t);
+ *rights |= right;
+ if (right == 0) break;
+ }
+ va_end(ap);
+ return rights;
+}
+
+inline cap_rights_t* _cap_rights_clear(cap_rights_t *rights, ...) {
+ va_list ap;
+ cap_rights_t right;
+ va_start(ap, rights);
+ while (true) {
+ right = va_arg(ap, cap_rights_t);
+ *rights &= ~right;
+ if (right == 0) break;
+ }
+ va_end(ap);
+ return rights;
+}
+
+inline bool _cap_rights_is_set(const cap_rights_t *rights, ...) {
+ va_list ap;
+ cap_rights_t right;
+ cap_rights_t accumulated = 0;
+ va_start(ap, rights);
+ while (true) {
+ right = va_arg(ap, cap_rights_t);
+ accumulated |= right;
+ if (right == 0) break;
+ }
+ va_end(ap);
+ return (accumulated & *rights) == accumulated;
+}
+
+inline bool _cap_rights_is_valid(const cap_rights_t *rights) {
+ return true;
+}
+
+inline cap_rights_t* cap_rights_merge(cap_rights_t *dst, const cap_rights_t *src) {
+ *dst |= *src;
+ return dst;
+}
+
+inline cap_rights_t* cap_rights_remove(cap_rights_t *dst, const cap_rights_t *src) {
+ *dst &= ~(*src);
+ return dst;
+}
+
+inline bool cap_rights_contains(const cap_rights_t *big, const cap_rights_t *little) {
+ return ((*big) & (*little)) == (*little);
+}
+
+#endif /* old/new style rights manipulation */
+
+#endif /*__CAPSICUM_RIGHTS_H__*/
Index: contrib/capsicum-test/capsicum-test-main.cc
===================================================================
--- /dev/null
+++ contrib/capsicum-test/capsicum-test-main.cc
@@ -0,0 +1,164 @@
+#include <sys/types.h>
+#ifdef __linux__
+#include <sys/vfs.h>
+#include <linux/magic.h>
+#elif defined(__FreeBSD__)
+#include <sys/sysctl.h>
+#endif
+#include <ctype.h>
+#include <errno.h>
+#include <libgen.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <iostream>
+#include "gtest/gtest.h"
+#include "capsicum-test.h"
+
+std::string tmpdir;
+
+class SetupEnvironment : public ::testing::Environment
+{
+public:
+ SetupEnvironment() : teardown_tmpdir_(false) {}
+ void SetUp() override {
+ CheckCapsicumSupport();
+ if (tmpdir.empty()) {
+ std::cerr << "Generating temporary directory root: ";
+ CreateTemporaryRoot();
+ } else {
+ std::cerr << "User provided temporary directory root: ";
+ }
+ std::cerr << tmpdir << std::endl;
+ }
+ void CheckCapsicumSupport() {
+ // For versions of googletest that lack GTEST_SKIP.
+#ifndef GTEST_SKIP
+#define GTEST_SKIP GTEST_FAIL
+#define GTEST_SKIP_defined
+#endif
+
+#ifdef __FreeBSD__
+ size_t trap_enotcap_enabled_len;
+ int rc;
+ bool trap_enotcap_enabled;
+
+ trap_enotcap_enabled_len = sizeof(trap_enotcap_enabled);
+
+ if (feature_present("security_capabilities") == 0) {
+ GTEST_SKIP() << "Tests require a CAPABILITIES enabled kernel";
+ } else {
+ std::cerr << "Running on a CAPABILITIES enabled kernel - OK!"
+ << std::endl;
+ }
+ const char *oid = "kern.trap_enotcap";
+ rc = sysctlbyname(oid, &trap_enotcap_enabled, &trap_enotcap_enabled_len,
+ nullptr, 0);
+ if (rc != 0) {
+ GTEST_FAIL() << "sysctlbyname failed: " << strerror(errno);
+ }
+ if (trap_enotcap_enabled) {
+ GTEST_SKIP() << "Sysctl " << oid << " enabled. "
+ << "Skipping tests to avoid non-determinism with results";
+ } else {
+ std::cerr << "Sysctl " << oid << " not enabled - OK!" << std::endl;
+ }
+#endif /* FreeBSD */
+
+#ifdef GTEST_SKIP_defined
+#undef GTEST_SKIP
+#endif
+ }
+ void CreateTemporaryRoot() {
+ char *tmpdir_name = tempnam(nullptr, "cptst");
+
+ ASSERT_NE(tmpdir_name, nullptr);
+ ASSERT_EQ(mkdir(tmpdir_name, 0700), 0) <<
+ "Could not create temp directory, " << tmpdir_name << ": " <<
+ strerror(errno);
+ tmpdir = std::string(tmpdir_name);
+ free(tmpdir_name);
+ teardown_tmpdir_ = true;
+ }
+ void TearDown() override {
+ if (teardown_tmpdir_) {
+ rmdir(tmpdir.c_str());
+ }
+ }
+private:
+ bool teardown_tmpdir_;
+};
+
+std::string capsicum_test_bindir;
+
+int main(int argc, char* argv[]) {
+ // Set up the test program path, so capsicum-test can find programs, like
+ // mini-me* when executed from an absolute path.
+ {
+ char *new_path, *old_path, *program_name;
+
+ program_name = strdup(argv[0]);
+ assert(program_name);
+ capsicum_test_bindir = std::string(dirname(program_name));
+ free(program_name);
+
+ old_path = getenv("PATH");
+ assert(old_path);
+
+ assert(asprintf(&new_path, "%s:%s", capsicum_test_bindir.c_str(),
+ old_path) > 0);
+ assert(setenv("PATH", new_path, 1) == 0);
+ }
+
+ ::testing::InitGoogleTest(&argc, argv);
+ for (int ii = 1; ii < argc; ii++) {
+ if (strcmp(argv[ii], "-v") == 0) {
+ verbose = true;
+ } else if (strcmp(argv[ii], "-T") == 0) {
+ ii++;
+ assert(ii < argc);
+ tmpdir = argv[ii];
+ struct stat info;
+ stat(tmpdir.c_str(), &info);
+ assert(S_ISDIR(info.st_mode));
+ } else if (strcmp(argv[ii], "-t") == 0) {
+ force_mt = true;
+ } else if (strcmp(argv[ii], "-F") == 0) {
+ force_nofork = true;
+ } else if (strcmp(argv[ii], "-u") == 0) {
+ if (++ii >= argc) {
+ std::cerr << "-u needs argument" << std::endl;
+ exit(1);
+ }
+ if (isdigit(argv[ii][0])) {
+ other_uid = atoi(argv[ii]);
+ } else {
+ struct passwd *p = getpwnam(argv[ii]);
+ if (!p) {
+ std::cerr << "Failed to get entry for " << argv[ii] << ", errno=" << errno << std::endl;
+ exit(1);
+ }
+ other_uid = p->pw_uid;
+ }
+ }
+ }
+ if (other_uid == 0) {
+ struct stat info;
+ if (stat(argv[0], &info) == 0) {
+ other_uid = info.st_uid;
+ }
+ }
+
+#ifdef __linux__
+ // Check whether our temporary directory is on a tmpfs volume.
+ struct statfs fsinfo;
+ statfs(tmpdir.c_str(), &fsinfo);
+ tmpdir_on_tmpfs = (fsinfo.f_type == TMPFS_MAGIC);
+#endif
+
+ testing::AddGlobalTestEnvironment(new SetupEnvironment());
+ int rc = RUN_ALL_TESTS();
+ ShowSkippedTests(std::cerr);
+ return rc;
+}
Index: contrib/capsicum-test/capsicum-test.h
===================================================================
--- /dev/null
+++ contrib/capsicum-test/capsicum-test.h
@@ -0,0 +1,260 @@
+/* -*- C++ -*- */
+#ifndef CAPSICUM_TEST_H
+#define CAPSICUM_TEST_H
+
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/resource.h>
+#include <signal.h>
+
+#include <ios>
+#include <ostream>
+
+#include "gtest/gtest.h"
+
+extern bool verbose;
+extern std::string tmpdir;
+extern bool tmpdir_on_tmpfs;
+extern bool force_mt;
+extern bool force_nofork;
+extern uid_t other_uid;
+
+static inline void *WaitingThreadFn(void *) {
+ // Loop until cancelled
+ while (true) {
+ usleep(10000);
+ pthread_testcancel();
+ }
+ return NULL;
+}
+
+// If force_mt is set, run another thread in parallel with the test. This forces
+// the kernel into multi-threaded mode.
+template <typename T, typename Function>
+void MaybeRunWithThread(T *self, Function fn) {
+ pthread_t subthread;
+ if (force_mt) {
+ pthread_create(&subthread, NULL, WaitingThreadFn, NULL);
+ }
+ (self->*fn)();
+ if (force_mt) {
+ pthread_cancel(subthread);
+ pthread_join(subthread, NULL);
+ }
+}
+template <typename Function>
+void MaybeRunWithThread(Function fn) {
+ pthread_t subthread;
+ if (force_mt) {
+ pthread_create(&subthread, NULL, WaitingThreadFn, NULL);
+ }
+ (fn)();
+ if (force_mt) {
+ pthread_cancel(subthread);
+ pthread_join(subthread, NULL);
+ }
+}
+
+// Return the absolute path of a filename in the temp directory, `tmpdir`,
+// with the given pathname, e.g., "/tmp/<pathname>", if `tmpdir` was set to
+// "/tmp".
+const char *TmpFile(const char *pathname);
+
+// Run the given test function in a forked process, so that trapdoor
+// entry doesn't affect other tests, and watch out for hung processes.
+// Implemented as a macro to allow access to the test case instance's
+// HasFailure() method, which is reported as the forked process's
+// exit status.
+#define _RUN_FORKED(INNERCODE, TESTCASENAME, TESTNAME) \
+ pid_t pid = force_nofork ? 0 : fork(); \
+ if (pid == 0) { \
+ INNERCODE; \
+ if (!force_nofork) { \
+ exit(HasFailure()); \
+ } \
+ } else if (pid > 0) { \
+ int rc, status; \
+ int remaining_us = 10000000; \
+ while (remaining_us > 0) { \
+ status = 0; \
+ rc = waitpid(pid, &status, WNOHANG); \
+ if (rc != 0) break; \
+ remaining_us -= 10000; \
+ usleep(10000); \
+ } \
+ if (remaining_us <= 0) { \
+ fprintf(stderr, "Warning: killing unresponsive test " \
+ "%s.%s (pid %d)\n", \
+ TESTCASENAME, TESTNAME, pid); \
+ kill(pid, SIGKILL); \
+ ADD_FAILURE() << "Test hung"; \
+ } else if (rc < 0) { \
+ fprintf(stderr, "Warning: waitpid error %s (%d)\n", \
+ strerror(errno), errno); \
+ ADD_FAILURE() << "Failed to wait for child"; \
+ } else { \
+ int rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1; \
+ EXPECT_EQ(0, rc); \
+ } \
+ }
+#define _RUN_FORKED_MEM(THIS, TESTFN, TESTCASENAME, TESTNAME) \
+ _RUN_FORKED(MaybeRunWithThread(THIS, &TESTFN), TESTCASENAME, TESTNAME);
+#define _RUN_FORKED_FN(TESTFN, TESTCASENAME, TESTNAME) \
+ _RUN_FORKED(MaybeRunWithThread(&TESTFN), TESTCASENAME, TESTNAME);
+
+// Run a test case in a forked process, possibly cleaning up a
+// test file after completion
+#define FORK_TEST_ON(test_case_name, test_name, test_file) \
+ static void test_case_name##_##test_name##_ForkTest(); \
+ TEST(test_case_name, test_name ## Forked) { \
+ _RUN_FORKED_FN(test_case_name##_##test_name##_ForkTest, \
+ #test_case_name, #test_name); \
+ const char *filename = test_file; \
+ if (filename) unlink(filename); \
+ } \
+ static void test_case_name##_##test_name##_ForkTest()
+
+#define FORK_TEST(test_case_name, test_name) FORK_TEST_ON(test_case_name, test_name, NULL)
+
+// Run a test case fixture in a forked process, so that trapdoors don't
+// affect other tests.
+#define ICLASS_NAME(test_case_name, test_name) Forked##test_case_name##_##test_name
+#define FORK_TEST_F(test_case_name, test_name) \
+ class ICLASS_NAME(test_case_name, test_name) : public test_case_name { \
+ public: \
+ ICLASS_NAME(test_case_name, test_name)() {} \
+ void InnerTestBody(); \
+ }; \
+ TEST_F(ICLASS_NAME(test_case_name, test_name), _) { \
+ _RUN_FORKED_MEM(this, \
+ ICLASS_NAME(test_case_name, test_name)::InnerTestBody, \
+ #test_case_name, #test_name); \
+ } \
+ void ICLASS_NAME(test_case_name, test_name)::InnerTestBody()
+
+// Emit errno information on failure
+#define EXPECT_OK(v) EXPECT_LE(0, v) << " errno " << errno << " " << strerror(errno)
+
+// Expect a syscall to fail with the given error.
+#define EXPECT_SYSCALL_FAIL(E, C) \
+ do { \
+ EXPECT_GT(0, C); \
+ EXPECT_EQ(E, errno); \
+ } while (0)
+
+// Expect a syscall to fail with anything other than the given error.
+#define EXPECT_SYSCALL_FAIL_NOT(E, C) \
+ do { \
+ EXPECT_GT(0, C); \
+ EXPECT_NE(E, errno); \
+ } while (0)
+
+// Expect a void syscall to fail with anything other than the given error.
+#define EXPECT_VOID_SYSCALL_FAIL_NOT(E, C) \
+ do { \
+ errno = 0; \
+ C; \
+ EXPECT_NE(E, errno) << #C << " failed with ECAPMODE"; \
+ } while (0)
+
+// Expect a system call to fail due to path traversal; exact error
+// code is OS-specific.
+#ifdef O_BENEATH
+#define EXPECT_OPENAT_FAIL_TRAVERSAL(fd, path, flags) \
+ do { \
+ const int result = openat((fd), (path), (flags)); \
+ if (((flags) & O_BENEATH) == O_BENEATH) { \
+ EXPECT_SYSCALL_FAIL(E_NO_TRAVERSE_O_BENEATH, result); \
+ } else { \
+ EXPECT_SYSCALL_FAIL(E_NO_TRAVERSE_CAPABILITY, result); \
+ } \
+ } while (0)
+#else
+#define EXPECT_OPENAT_FAIL_TRAVERSAL(fd, path, flags) \
+ do { \
+ const int result = openat((fd), (path), (flags)); \
+ EXPECT_SYSCALL_FAIL(E_NO_TRAVERSE_CAPABILITY, result); \
+ } while (0)
+#endif
+
+// Expect a system call to fail with ECAPMODE.
+#define EXPECT_CAPMODE(C) EXPECT_SYSCALL_FAIL(ECAPMODE, C)
+
+// Expect a system call to fail, but not with ECAPMODE.
+#define EXPECT_FAIL_NOT_CAPMODE(C) EXPECT_SYSCALL_FAIL_NOT(ECAPMODE, C)
+#define EXPECT_FAIL_VOID_NOT_CAPMODE(C) EXPECT_VOID_SYSCALL_FAIL_NOT(ECAPMODE, C)
+
+// Expect a system call to fail with ENOTCAPABLE.
+#define EXPECT_NOTCAPABLE(C) EXPECT_SYSCALL_FAIL(ENOTCAPABLE, C)
+
+// Expect a system call to fail, but not with ENOTCAPABLE.
+#define EXPECT_FAIL_NOT_NOTCAPABLE(C) EXPECT_SYSCALL_FAIL_NOT(ENOTCAPABLE, C)
+
+// Expect a system call to fail with either ENOTCAPABLE or ECAPMODE.
+#define EXPECT_CAPFAIL(C) \
+ do { \
+ int rc = C; \
+ EXPECT_GT(0, rc); \
+ EXPECT_TRUE(errno == ECAPMODE || errno == ENOTCAPABLE) \
+ << #C << " did not fail with ECAPMODE/ENOTCAPABLE but " << errno; \
+ } while (0)
+
+// Ensure that 'rights' are a subset of 'max'.
+#define EXPECT_RIGHTS_IN(rights, max) \
+ EXPECT_TRUE(cap_rights_contains((max), (rights))) \
+ << "rights " << std::hex << *(rights) \
+ << " not a subset of " << std::hex << *(max)
+
+// Ensure rights are identical
+#define EXPECT_RIGHTS_EQ(a, b) \
+ do { \
+ EXPECT_RIGHTS_IN((a), (b)); \
+ EXPECT_RIGHTS_IN((b), (a)); \
+ } while (0)
+
+// Get the state of a process as a single character.
+// - 'D': disk wait
+// - 'R': runnable
+// - 'S': sleeping/idle
+// - 'T': stopped
+// - 'Z': zombie
+// On error, return either '?' or '\0'.
+char ProcessState(int pid);
+
+// Check process state reaches a particular expected state (or two).
+// Retries a few times to allow for timing issues.
+#define EXPECT_PID_REACHES_STATES(pid, expected1, expected2) { \
+ int counter = 5; \
+ char state; \
+ do { \
+ state = ProcessState(pid); \
+ if (state == expected1 || state == expected2) break; \
+ usleep(100000); \
+ } while (--counter > 0); \
+ EXPECT_TRUE(state == expected1 || state == expected2) \
+ << " pid " << pid << " in state " << state; \
+}
+
+#define EXPECT_PID_ALIVE(pid) EXPECT_PID_REACHES_STATES(pid, 'R', 'S')
+#define EXPECT_PID_DEAD(pid) EXPECT_PID_REACHES_STATES(pid, 'Z', '\0')
+#define EXPECT_PID_ZOMBIE(pid) EXPECT_PID_REACHES_STATES(pid, 'Z', 'Z');
+#define EXPECT_PID_GONE(pid) EXPECT_PID_REACHES_STATES(pid, '\0', '\0');
+
+void ShowSkippedTests(std::ostream& os);
+void TestSkipped(const char *testcase, const char *test, const std::string& reason);
+#define TEST_SKIPPED(reason) \
+ do { \
+ const ::testing::TestInfo* const info = ::testing::UnitTest::GetInstance()->current_test_info(); \
+ std::cerr << "Skipping " << info->test_case_name() << "::" << info->name() << " because: " << reason << std::endl; \
+ TestSkipped(info->test_case_name(), info->name(), reason); \
+ } while (0)
+
+// Mark a test that can only be run as root.
+#define REQUIRE_ROOT() \
+ if (getuid() != 0) { \
+ TEST_SKIPPED("requires root"); \
+ return; \
+ }
+
+#endif // CAPSICUM_TEST_H
Index: contrib/capsicum-test/capsicum-test.cc
===================================================================
--- /dev/null
+++ contrib/capsicum-test/capsicum-test.cc
@@ -0,0 +1,102 @@
+#include "capsicum-test.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <signal.h>
+
+#include <map>
+#include <vector>
+#include <string>
+
+bool verbose = false;
+bool tmpdir_on_tmpfs = false;
+bool force_mt = false;
+bool force_nofork = false;
+uid_t other_uid = 0;
+
+namespace {
+std::map<std::string, std::string> tmp_paths;
+}
+
+const char *TmpFile(const char *p) {
+ std::string pathname(p);
+ if (tmp_paths.find(pathname) == tmp_paths.end()) {
+ std::string fullname = tmpdir + "/" + pathname;
+ tmp_paths[pathname] = fullname;
+ }
+ return tmp_paths[pathname].c_str();
+}
+
+char ProcessState(int pid) {
+#ifdef __linux__
+ // Open the process status file.
+ char s[1024];
+ snprintf(s, sizeof(s), "/proc/%d/status", pid);
+ FILE *f = fopen(s, "r");
+ if (f == NULL) return '\0';
+
+ // Read the file line by line looking for the state line.
+ const char *prompt = "State:\t";
+ while (!feof(f)) {
+ fgets(s, sizeof(s), f);
+ if (!strncmp(s, prompt, strlen(prompt))) {
+ fclose(f);
+ return s[strlen(prompt)];
+ }
+ }
+ fclose(f);
+ return '?';
+#endif
+#ifdef __FreeBSD__
+ char buffer[1024];
+ snprintf(buffer, sizeof(buffer), "ps -p %d -o state | grep -v STAT", pid);
+ sig_t original = signal(SIGCHLD, SIG_IGN);
+ FILE* cmd = popen(buffer, "r");
+ usleep(50000); // allow any pending SIGCHLD signals to arrive
+ signal(SIGCHLD, original);
+ int result = fgetc(cmd);
+ fclose(cmd);
+ // Map FreeBSD codes to Linux codes.
+ switch (result) {
+ case EOF:
+ return '\0';
+ case 'D': // disk wait
+ case 'R': // runnable
+ case 'S': // sleeping
+ case 'T': // stopped
+ case 'Z': // zombie
+ return result;
+ case 'W': // idle interrupt thread
+ return 'S';
+ case 'I': // idle
+ return 'S';
+ case 'L': // waiting to acquire lock
+ default:
+ return '?';
+ }
+#endif
+}
+
+typedef std::vector<std::string> TestList;
+typedef std::map<std::string, TestList*> SkippedTestMap;
+static SkippedTestMap skipped_tests;
+void TestSkipped(const char *testcase, const char *test, const std::string& reason) {
+ if (skipped_tests.find(reason) == skipped_tests.end()) {
+ skipped_tests[reason] = new TestList;
+ }
+ std::string testname(testcase);
+ testname += ".";
+ testname += test;
+ skipped_tests[reason]->push_back(testname);
+}
+
+void ShowSkippedTests(std::ostream& os) {
+ for (SkippedTestMap::iterator skiplist = skipped_tests.begin();
+ skiplist != skipped_tests.end(); ++skiplist) {
+ os << "Following tests were skipped because: " << skiplist->first << std::endl;
+ for (size_t ii = 0; ii < skiplist->second->size(); ++ii) {
+ const std::string& testname((*skiplist->second)[ii]);
+ os << " " << testname << std::endl;
+ }
+ }
+}
Index: contrib/capsicum-test/capsicum.h
===================================================================
--- /dev/null
+++ contrib/capsicum-test/capsicum.h
@@ -0,0 +1,175 @@
+/*
+ * Minimal portability layer for Capsicum-related features.
+ */
+#ifndef __CAPSICUM_H__
+#define __CAPSICUM_H__
+
+#ifdef __FreeBSD__
+#include "capsicum-freebsd.h"
+#endif
+
+#ifdef __linux__
+#include "capsicum-linux.h"
+#endif
+
+/*
+ * CAP_ALL/CAP_NONE is a value in FreeBSD9.x Capsicum, but a functional macro
+ * in FreeBSD10.x Capsicum. Always use CAP_SET_ALL/CAP_SET_NONE instead.
+ */
+#ifndef CAP_SET_ALL
+#ifdef CAP_RIGHTS_VERSION
+#define CAP_SET_ALL(rights) CAP_ALL(rights)
+#else
+#define CAP_SET_ALL(rights) *(rights) = CAP_MASK_VALID
+#endif
+#endif
+
+#ifndef CAP_SET_NONE
+#ifdef CAP_RIGHTS_VERSION
+#define CAP_SET_NONE(rights) CAP_NONE(rights)
+#else
+#define CAP_SET_NONE(rights) *(rights) = 0
+#endif
+#endif
+
+
+/************************************************************
+ * Define new-style rights in terms of old-style rights if
+ * absent.
+ ************************************************************/
+#include "capsicum-rights.h"
+
+/*
+ * Cope with systems (e.g. FreeBSD 10.x) where CAP_RENAMEAT hasn't been split out.
+ * (src, dest): RENAMEAT, LINKAT => RENAMEAT_SOURCE, RENAMEAT_TARGET
+ */
+#ifndef CAP_RENAMEAT_SOURCE
+#define CAP_RENAMEAT_SOURCE CAP_RENAMEAT
+#endif
+#ifndef CAP_RENAMEAT_TARGET
+#define CAP_RENAMEAT_TARGET CAP_LINKAT
+#endif
+/*
+ * Cope with systems (e.g. FreeBSD 10.x) where CAP_RENAMEAT hasn't been split out.
+ * (src, dest): 0, LINKAT => LINKAT_SOURCE, LINKAT_TARGET
+ */
+#ifndef CAP_LINKAT_SOURCE
+#define CAP_LINKAT_SOURCE CAP_LOOKUP
+#endif
+#ifndef CAP_LINKAT_TARGET
+#define CAP_LINKAT_TARGET CAP_LINKAT
+#endif
+
+#ifdef CAP_PREAD
+/* Existence of CAP_PREAD implies new-style CAP_SEEK semantics */
+#define CAP_SEEK_ASWAS 0
+#else
+/* Old-style CAP_SEEK semantics */
+#define CAP_SEEK_ASWAS CAP_SEEK
+#define CAP_PREAD CAP_READ
+#define CAP_PWRITE CAP_WRITE
+#endif
+
+#ifndef CAP_MMAP_R
+#define CAP_MMAP_R (CAP_READ|CAP_MMAP)
+#define CAP_MMAP_W (CAP_WRITE|CAP_MMAP)
+#define CAP_MMAP_X (CAP_MAPEXEC|CAP_MMAP)
+#define CAP_MMAP_RW (CAP_MMAP_R|CAP_MMAP_W)
+#define CAP_MMAP_RX (CAP_MMAP_R|CAP_MMAP_X)
+#define CAP_MMAP_WX (CAP_MMAP_W|CAP_MMAP_X)
+#define CAP_MMAP_RWX (CAP_MMAP_R|CAP_MMAP_W|CAP_MMAP_X)
+#endif
+
+#ifndef CAP_MKFIFOAT
+#define CAP_MKFIFOAT CAP_MKFIFO
+#endif
+
+#ifndef CAP_MKNODAT
+#define CAP_MKNODAT CAP_MKFIFOAT
+#endif
+
+#ifndef CAP_MKDIRAT
+#define CAP_MKDIRAT CAP_MKDIR
+#endif
+
+#ifndef CAP_UNLINKAT
+#define CAP_UNLINKAT CAP_RMDIR
+#endif
+
+#ifndef CAP_SOCK_CLIENT
+#define CAP_SOCK_CLIENT \
+ (CAP_CONNECT | CAP_GETPEERNAME | CAP_GETSOCKNAME | CAP_GETSOCKOPT | \
+ CAP_PEELOFF | CAP_READ | CAP_WRITE | CAP_SETSOCKOPT | CAP_SHUTDOWN)
+#endif
+
+#ifndef CAP_SOCK_SERVER
+#define CAP_SOCK_SERVER \
+ (CAP_ACCEPT | CAP_BIND | CAP_GETPEERNAME | CAP_GETSOCKNAME | \
+ CAP_GETSOCKOPT | CAP_LISTEN | CAP_PEELOFF | CAP_READ | CAP_WRITE | \
+ CAP_SETSOCKOPT | CAP_SHUTDOWN)
+#endif
+
+#ifndef CAP_EVENT
+#define CAP_EVENT CAP_POLL_EVENT
+#endif
+
+/************************************************************
+ * Define new-style API functions in terms of old-style API
+ * functions if absent.
+ ************************************************************/
+#ifndef HAVE_CAP_RIGHTS_GET
+/* Define cap_rights_get() in terms of old-style cap_getrights() */
+inline int cap_rights_get(int fd, cap_rights_t *rights) {
+ return cap_getrights(fd, rights);
+}
+#endif
+
+#ifndef HAVE_CAP_RIGHTS_LIMIT
+/* Define cap_rights_limit() in terms of old-style cap_new() and dup2() */
+#include <unistd.h>
+inline int cap_rights_limit(int fd, const cap_rights_t *rights) {
+ int cap = cap_new(fd, *rights);
+ if (cap < 0) return cap;
+ int rc = dup2(cap, fd);
+ if (rc < 0) return rc;
+ close(cap);
+ return rc;
+}
+#endif
+
+#include <stdio.h>
+#ifdef CAP_RIGHTS_VERSION
+/* New-style Capsicum API extras for debugging */
+static inline void cap_rights_describe(const cap_rights_t *rights, char *buffer) {
+ int ii;
+ for (ii = 0; ii < (CAP_RIGHTS_VERSION+2); ii++) {
+ int len = sprintf(buffer, "0x%016llx ", (unsigned long long)rights->cr_rights[ii]);
+ buffer += len;
+ }
+}
+
+#ifdef __cplusplus
+#include <iostream>
+#include <iomanip>
+inline std::ostream& operator<<(std::ostream& os, cap_rights_t rights) {
+ for (int ii = 0; ii < (CAP_RIGHTS_VERSION+2); ii++) {
+ os << std::hex << std::setw(16) << std::setfill('0') << (unsigned long long)rights.cr_rights[ii] << " ";
+ }
+ return os;
+}
+#endif
+
+#else
+
+static inline void cap_rights_describe(const cap_rights_t *rights, char *buffer) {
+ sprintf(buffer, "0x%016llx", (*rights));
+}
+
+#endif /* new/old style rights manipulation */
+
+#ifdef __cplusplus
+#include <string>
+extern std::string capsicum_test_bindir;
+#endif
+
+#endif /*__CAPSICUM_H__*/
Index: contrib/capsicum-test/fcntl.cc
===================================================================
--- /dev/null
+++ contrib/capsicum-test/fcntl.cc
@@ -0,0 +1,411 @@
+// Test that fcntl works in capability mode.
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdint.h>
+
+#include <string>
+#include <map>
+
+#include "capsicum.h"
+#include "capsicum-test.h"
+#include "syscalls.h"
+
+// Ensure that fcntl() works consistently for both regular file descriptors and
+// capability-wrapped ones.
+FORK_TEST(Fcntl, Basic) {
+ cap_rights_t rights;
+ cap_rights_init(&rights, CAP_READ, CAP_FCNTL);
+
+ typedef std::map<std::string, int> FileMap;
+
+ // Open some files of different types, and wrap them in capabilities.
+ FileMap files;
+ files["file"] = open("/etc/passwd", O_RDONLY);
+ EXPECT_OK(files["file"]);
+ files["socket"] = socket(PF_LOCAL, SOCK_STREAM, 0);
+ EXPECT_OK(files["socket"]);
+ char shm_name[128];
+ sprintf(shm_name, "/capsicum-test-%d", getuid());
+ files["SHM"] = shm_open(shm_name, (O_CREAT|O_RDWR), 0600);
+ if ((files["SHM"] == -1) && errno == ENOSYS) {
+ // shm_open() is not implemented in user-mode Linux.
+ files.erase("SHM");
+ } else {
+ EXPECT_OK(files["SHM"]);
+ }
+
+ FileMap caps;
+ for (FileMap::iterator ii = files.begin(); ii != files.end(); ++ii) {
+ std::string key = ii->first + " cap";
+ caps[key] = dup(ii->second);
+ EXPECT_OK(cap_rights_limit(caps[key], &rights));
+ EXPECT_OK(caps[key]) << " on " << ii->first;
+ }
+
+ FileMap all(files);
+ all.insert(files.begin(), files.end());
+
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+
+ // Ensure that we can fcntl() all the files that we opened above.
+ cap_rights_t r_ro;
+ cap_rights_init(&r_ro, CAP_READ);
+ for (FileMap::iterator ii = all.begin(); ii != all.end(); ++ii) {
+ EXPECT_OK(fcntl(ii->second, F_GETFL, 0)) << " on " << ii->first;
+ int cap = dup(ii->second);
+ EXPECT_OK(cap) << " on " << ii->first;
+ EXPECT_OK(cap_rights_limit(cap, &r_ro)) << " on " << ii->first;
+ EXPECT_EQ(-1, fcntl(cap, F_GETFL, 0)) << " on " << ii->first;
+ EXPECT_EQ(ENOTCAPABLE, errno) << " on " << ii->first;
+ close(cap);
+ }
+ for (FileMap::iterator ii = all.begin(); ii != all.end(); ++ii) {
+ close(ii->second);
+ }
+ shm_unlink(shm_name);
+}
+
+// Supported fcntl(2) operations:
+// FreeBSD10 FreeBSD9.1: Linux: Rights: Summary:
+// F_DUPFD F_DUPFD F_DUPFD NONE as dup(2)
+// F_DUPFD_CLOEXEC F_DUPFD_CLOEXEC NONE as dup(2) with close-on-exec
+// F_DUP2FD F_DUP2FD NONE as dup2(2)
+// F_DUP2FD_CLOEXEC NONE as dup2(2) with close-on-exec
+// F_GETFD F_GETFD F_GETFD NONE get close-on-exec flag
+// F_SETFD F_SETFD F_SETFD NONE set close-on-exec flag
+// * F_GETFL F_GETFL F_GETFL FCNTL get file status flag
+// * F_SETFL F_SETFL F_SETFL FCNTL set file status flag
+// * F_GETOWN F_GETOWN F_GETOWN FCNTL get pid receiving SIGIO/SIGURG
+// * F_SETOWN F_SETOWN F_SETOWN FCNTL set pid receiving SIGIO/SIGURG
+// * F_GETOWN_EX FCNTL get pid/thread receiving SIGIO/SIGURG
+// * F_SETOWN_EX FCNTL set pid/thread receiving SIGIO/SIGURG
+// F_GETLK F_GETLK F_GETLK FLOCK get lock info
+// F_SETLK F_SETLK F_SETLK FLOCK set lock info
+// F_SETLK_REMOTE FLOCK set lock info
+// F_SETLKW F_SETLKW F_SETLKW FLOCK set lock info (blocking)
+// F_READAHEAD F_READAHEAD NONE set or clear readahead amount
+// F_RDAHEAD F_RDAHEAD NONE set or clear readahead amount to 128KB
+// F_GETSIG POLL_EVENT+FSIGNAL get signal sent when I/O possible
+// F_SETSIG POLL_EVENT+FSIGNAL set signal sent when I/O possible
+// F_GETLEASE FLOCK+FSIGNAL get lease on file descriptor
+// F_SETLEASE FLOCK+FSIGNAL set new lease on file descriptor
+// F_NOTIFY NOTIFY generate signal on changes (dnotify)
+// F_GETPIPE_SZ GETSOCKOPT get pipe size
+// F_SETPIPE_SZ SETSOCKOPT set pipe size
+// F_GET_SEAL FSTAT get memfd seals
+// F_ADD_SEAL FCHMOD set memfd seal
+// If HAVE_CAP_FCNTLS_LIMIT is defined, then fcntl(2) operations that require
+// CAP_FCNTL (marked with * above) can be further limited with cap_fcntls_limit(2).
+namespace {
+#define FCNTL_NUM_RIGHTS 9
+cap_rights_t fcntl_rights[FCNTL_NUM_RIGHTS];
+void InitRights() {
+ cap_rights_init(&(fcntl_rights[0]), 0); // Later code assumes this is at [0]
+ cap_rights_init(&(fcntl_rights[1]), CAP_READ, CAP_WRITE);
+ cap_rights_init(&(fcntl_rights[2]), CAP_FCNTL);
+ cap_rights_init(&(fcntl_rights[3]), CAP_FLOCK);
+#ifdef CAP_FSIGNAL
+ cap_rights_init(&(fcntl_rights[4]), CAP_EVENT, CAP_FSIGNAL);
+ cap_rights_init(&(fcntl_rights[5]), CAP_FLOCK, CAP_FSIGNAL);
+#else
+ cap_rights_init(&(fcntl_rights[4]), 0);
+ cap_rights_init(&(fcntl_rights[5]), 0);
+#endif
+#ifdef CAP_NOTIFY
+ cap_rights_init(&(fcntl_rights[6]), CAP_NOTIFY);
+#else
+ cap_rights_init(&(fcntl_rights[6]), 0);
+#endif
+ cap_rights_init(&(fcntl_rights[7]), CAP_SETSOCKOPT);
+ cap_rights_init(&(fcntl_rights[8]), CAP_GETSOCKOPT);
+}
+
+int CheckFcntl(unsigned long long right, int caps[FCNTL_NUM_RIGHTS], int cmd, long arg, const char* context) {
+ SCOPED_TRACE(context);
+ cap_rights_t rights;
+ cap_rights_init(&rights, right);
+ int ok_index = -1;
+ for (int ii = 0; ii < FCNTL_NUM_RIGHTS; ++ii) {
+ if (cap_rights_contains(&(fcntl_rights[ii]), &rights)) {
+ if (ok_index == -1) ok_index = ii;
+ continue;
+ }
+ EXPECT_NOTCAPABLE(fcntl(caps[ii], cmd, arg));
+ }
+ EXPECT_NE(-1, ok_index);
+ int rc = fcntl(caps[ok_index], cmd, arg);
+ EXPECT_OK(rc);
+ return rc;
+}
+} // namespace
+
+#define CHECK_FCNTL(right, caps, cmd, arg) \
+ CheckFcntl(right, caps, cmd, arg, "fcntl(" #cmd ") expect " #right)
+
+TEST(Fcntl, Commands) {
+ InitRights();
+ int fd = open(TmpFile("cap_fcntl_cmds"), O_RDWR|O_CREAT, 0644);
+ EXPECT_OK(fd);
+ write(fd, "TEST", 4);
+ int sock = socket(PF_LOCAL, SOCK_STREAM, 0);
+ EXPECT_OK(sock);
+ int caps[FCNTL_NUM_RIGHTS];
+ int sock_caps[FCNTL_NUM_RIGHTS];
+ for (int ii = 0; ii < FCNTL_NUM_RIGHTS; ++ii) {
+ caps[ii] = dup(fd);
+ EXPECT_OK(caps[ii]);
+ EXPECT_OK(cap_rights_limit(caps[ii], &(fcntl_rights[ii])));
+ sock_caps[ii] = dup(sock);
+ EXPECT_OK(sock_caps[ii]);
+ EXPECT_OK(cap_rights_limit(sock_caps[ii], &(fcntl_rights[ii])));
+ }
+
+ // Check the things that need no rights against caps[0].
+ int newfd = fcntl(caps[0], F_DUPFD, 0);
+ EXPECT_OK(newfd);
+ // dup()'ed FD should have same rights.
+ cap_rights_t rights;
+ cap_rights_init(&rights, 0);
+ EXPECT_OK(cap_rights_get(newfd, &rights));
+ EXPECT_RIGHTS_EQ(&(fcntl_rights[0]), &rights);
+ close(newfd);
+#ifdef HAVE_F_DUP2FD
+ EXPECT_OK(fcntl(caps[0], F_DUP2FD, newfd));
+ // dup2()'ed FD should have same rights.
+ EXPECT_OK(cap_rights_get(newfd, &rights));
+ EXPECT_RIGHTS_EQ(&(fcntl_rights[0]), &rights);
+ close(newfd);
+#endif
+
+ EXPECT_OK(fcntl(caps[0], F_GETFD, 0));
+ EXPECT_OK(fcntl(caps[0], F_SETFD, 0));
+
+ // Check operations that need CAP_FCNTL.
+ int fd_flag = CHECK_FCNTL(CAP_FCNTL, caps, F_GETFL, 0);
+ EXPECT_EQ(0, CHECK_FCNTL(CAP_FCNTL, caps, F_SETFL, fd_flag));
+ int owner = CHECK_FCNTL(CAP_FCNTL, sock_caps, F_GETOWN, 0);
+ EXPECT_EQ(0, CHECK_FCNTL(CAP_FCNTL, sock_caps, F_SETOWN, owner));
+
+ // Check an operation needing CAP_FLOCK.
+ struct flock fl;
+ memset(&fl, 0, sizeof(fl));
+ fl.l_type = F_RDLCK;
+ fl.l_whence = SEEK_SET;
+ fl.l_start = 0;
+ fl.l_len = 1;
+ EXPECT_EQ(0, CHECK_FCNTL(CAP_FLOCK, caps, F_GETLK, (long)&fl));
+
+ for (int ii = 0; ii < FCNTL_NUM_RIGHTS; ++ii) {
+ close(sock_caps[ii]);
+ close(caps[ii]);
+ }
+ close(sock);
+ close(fd);
+ unlink(TmpFile("cap_fcntl_cmds"));
+}
+
+TEST(Fcntl, WriteLock) {
+ int fd = open(TmpFile("cap_fcntl_readlock"), O_RDWR|O_CREAT, 0644);
+ EXPECT_OK(fd);
+ write(fd, "TEST", 4);
+
+ int cap = dup(fd);
+ cap_rights_t rights;
+ cap_rights_init(&rights, CAP_FCNTL, CAP_READ, CAP_WRITE, CAP_FLOCK);
+ EXPECT_OK(cap_rights_limit(cap, &rights));
+
+ struct flock fl;
+ memset(&fl, 0, sizeof(fl));
+ fl.l_type = F_WRLCK;
+ fl.l_whence = SEEK_SET;
+ fl.l_start = 0;
+ fl.l_len = 1;
+ // Write-Lock
+ EXPECT_OK(fcntl(cap, F_SETLK, (long)&fl));
+
+ // Check write-locked (from another process).
+ pid_t child = fork();
+ if (child == 0) {
+ fl.l_type = F_WRLCK;
+ fl.l_whence = SEEK_SET;
+ fl.l_start = 0;
+ fl.l_len = 1;
+ EXPECT_OK(fcntl(fd, F_GETLK, (long)&fl));
+ EXPECT_NE(F_UNLCK, fl.l_type);
+ exit(HasFailure());
+ }
+ int status;
+ EXPECT_EQ(child, waitpid(child, &status, 0));
+ int rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
+ EXPECT_EQ(0, rc);
+
+ // Unlock
+ fl.l_type = F_UNLCK;
+ fl.l_whence = SEEK_SET;
+ fl.l_start = 0;
+ fl.l_len = 1;
+ EXPECT_OK(fcntl(cap, F_SETLK, (long)&fl));
+
+ close(cap);
+ close(fd);
+ unlink(TmpFile("cap_fcntl_readlock"));
+}
+
+#ifdef HAVE_CAP_FCNTLS_LIMIT
+TEST(Fcntl, SubRightNormalFD) {
+ int fd = open(TmpFile("cap_fcntl_subrightnorm"), O_RDWR|O_CREAT, 0644);
+ EXPECT_OK(fd);
+
+ // Restrict the fcntl(2) subrights of a normal FD.
+ EXPECT_OK(cap_fcntls_limit(fd, CAP_FCNTL_GETFL));
+ int fd_flag = fcntl(fd, F_GETFL, 0);
+ EXPECT_OK(fd_flag);
+ EXPECT_NOTCAPABLE(fcntl(fd, F_SETFL, fd_flag));
+
+ // Expect to have all capabilities.
+ cap_rights_t rights;
+ EXPECT_OK(cap_rights_get(fd, &rights));
+ cap_rights_t all;
+ CAP_SET_ALL(&all);
+ EXPECT_RIGHTS_EQ(&all, &rights);
+ cap_fcntl_t fcntls;
+ EXPECT_OK(cap_fcntls_get(fd, &fcntls));
+ EXPECT_EQ((cap_fcntl_t)CAP_FCNTL_GETFL, fcntls);
+
+ // Can't widen the subrights.
+ EXPECT_NOTCAPABLE(cap_fcntls_limit(fd, CAP_FCNTL_GETFL|CAP_FCNTL_SETFL));
+
+ close(fd);
+ unlink(TmpFile("cap_fcntl_subrightnorm"));
+}
+
+TEST(Fcntl, PreserveSubRights) {
+ int fd = open(TmpFile("cap_fcntl_subrightpreserve"), O_RDWR|O_CREAT, 0644);
+ EXPECT_OK(fd);
+
+ cap_rights_t rights;
+ cap_rights_init(&rights, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_FCNTL);
+ EXPECT_OK(cap_rights_limit(fd, &rights));
+ EXPECT_OK(cap_fcntls_limit(fd, CAP_FCNTL_GETFL));
+
+ cap_rights_t cur_rights;
+ cap_fcntl_t fcntls;
+ EXPECT_OK(cap_rights_get(fd, &cur_rights));
+ EXPECT_RIGHTS_EQ(&rights, &cur_rights);
+ EXPECT_OK(cap_fcntls_get(fd, &fcntls));
+ EXPECT_EQ((cap_fcntl_t)CAP_FCNTL_GETFL, fcntls);
+
+ // Limiting the top-level rights leaves the subrights unaffected...
+ cap_rights_clear(&rights, CAP_READ);
+ EXPECT_OK(cap_rights_limit(fd, &rights));
+ EXPECT_OK(cap_fcntls_get(fd, &fcntls));
+ EXPECT_EQ((cap_fcntl_t)CAP_FCNTL_GETFL, fcntls);
+
+ // ... until we remove CAP_FCNTL.
+ cap_rights_clear(&rights, CAP_FCNTL);
+ EXPECT_OK(cap_rights_limit(fd, &rights));
+ EXPECT_OK(cap_fcntls_get(fd, &fcntls));
+ EXPECT_EQ((cap_fcntl_t)0, fcntls);
+ EXPECT_EQ(-1, cap_fcntls_limit(fd, CAP_FCNTL_GETFL));
+
+ close(fd);
+ unlink(TmpFile("cap_fcntl_subrightpreserve"));
+}
+
+TEST(Fcntl, FLSubRights) {
+ int fd = open(TmpFile("cap_fcntl_subrights"), O_RDWR|O_CREAT, 0644);
+ EXPECT_OK(fd);
+ write(fd, "TEST", 4);
+ cap_rights_t rights;
+ cap_rights_init(&rights, CAP_FCNTL);
+ EXPECT_OK(cap_rights_limit(fd, &rights));
+
+ // Check operations that need CAP_FCNTL with subrights pristine => OK.
+ int fd_flag = fcntl(fd, F_GETFL, 0);
+ EXPECT_OK(fd_flag);
+ EXPECT_OK(fcntl(fd, F_SETFL, fd_flag));
+
+ // Check operations that need CAP_FCNTL with all subrights => OK.
+ EXPECT_OK(cap_fcntls_limit(fd, CAP_FCNTL_ALL));
+ fd_flag = fcntl(fd, F_GETFL, 0);
+ EXPECT_OK(fd_flag);
+ EXPECT_OK(fcntl(fd, F_SETFL, fd_flag));
+
+ // Check operations that need CAP_FCNTL with specific subrights.
+ int fd_get = dup(fd);
+ int fd_set = dup(fd);
+ EXPECT_OK(cap_fcntls_limit(fd_get, CAP_FCNTL_GETFL));
+ EXPECT_OK(cap_fcntls_limit(fd_set, CAP_FCNTL_SETFL));
+
+ fd_flag = fcntl(fd_get, F_GETFL, 0);
+ EXPECT_OK(fd_flag);
+ EXPECT_NOTCAPABLE(fcntl(fd_set, F_GETFL, 0));
+ EXPECT_OK(fcntl(fd_set, F_SETFL, fd_flag));
+ EXPECT_NOTCAPABLE(fcntl(fd_get, F_SETFL, fd_flag));
+ close(fd_get);
+ close(fd_set);
+
+ // Check operations that need CAP_FCNTL with no subrights => ENOTCAPABLE.
+ EXPECT_OK(cap_fcntls_limit(fd, 0));
+ EXPECT_NOTCAPABLE(fcntl(fd, F_GETFL, 0));
+ EXPECT_NOTCAPABLE(fcntl(fd, F_SETFL, fd_flag));
+
+ close(fd);
+ unlink(TmpFile("cap_fcntl_subrights"));
+}
+
+TEST(Fcntl, OWNSubRights) {
+ int sock = socket(PF_LOCAL, SOCK_STREAM, 0);
+ EXPECT_OK(sock);
+ cap_rights_t rights;
+ cap_rights_init(&rights, CAP_FCNTL);
+ EXPECT_OK(cap_rights_limit(sock, &rights));
+
+ // Check operations that need CAP_FCNTL with no subrights => OK.
+ int owner = fcntl(sock, F_GETOWN, 0);
+ EXPECT_OK(owner);
+ EXPECT_OK(fcntl(sock, F_SETOWN, owner));
+
+ // Check operations that need CAP_FCNTL with all subrights => OK.
+ EXPECT_OK(cap_fcntls_limit(sock, CAP_FCNTL_ALL));
+ owner = fcntl(sock, F_GETOWN, 0);
+ EXPECT_OK(owner);
+ EXPECT_OK(fcntl(sock, F_SETOWN, owner));
+
+ // Check operations that need CAP_FCNTL with specific subrights.
+ int sock_get = dup(sock);
+ int sock_set = dup(sock);
+ EXPECT_OK(cap_fcntls_limit(sock_get, CAP_FCNTL_GETOWN));
+ EXPECT_OK(cap_fcntls_limit(sock_set, CAP_FCNTL_SETOWN));
+ owner = fcntl(sock_get, F_GETOWN, 0);
+ EXPECT_OK(owner);
+ EXPECT_NOTCAPABLE(fcntl(sock_set, F_GETOWN, 0));
+ EXPECT_OK(fcntl(sock_set, F_SETOWN, owner));
+ EXPECT_NOTCAPABLE(fcntl(sock_get, F_SETOWN, owner));
+ // Also check we can retrieve the subrights.
+ cap_fcntl_t fcntls;
+ EXPECT_OK(cap_fcntls_get(sock_get, &fcntls));
+ EXPECT_EQ((cap_fcntl_t)CAP_FCNTL_GETOWN, fcntls);
+ EXPECT_OK(cap_fcntls_get(sock_set, &fcntls));
+ EXPECT_EQ((cap_fcntl_t)CAP_FCNTL_SETOWN, fcntls);
+ // And that we can't widen the subrights.
+ EXPECT_NOTCAPABLE(cap_fcntls_limit(sock_get, CAP_FCNTL_GETOWN|CAP_FCNTL_SETOWN));
+ EXPECT_NOTCAPABLE(cap_fcntls_limit(sock_set, CAP_FCNTL_GETOWN|CAP_FCNTL_SETOWN));
+ close(sock_get);
+ close(sock_set);
+
+ // Check operations that need CAP_FCNTL with no subrights => ENOTCAPABLE.
+ EXPECT_OK(cap_fcntls_limit(sock, 0));
+ EXPECT_NOTCAPABLE(fcntl(sock, F_GETOWN, 0));
+ EXPECT_NOTCAPABLE(fcntl(sock, F_SETOWN, owner));
+
+ close(sock);
+}
+#endif
Index: contrib/capsicum-test/fexecve.cc
===================================================================
--- /dev/null
+++ contrib/capsicum-test/fexecve.cc
@@ -0,0 +1,203 @@
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <sstream>
+
+#include "syscalls.h"
+#include "capsicum.h"
+#include "capsicum-test.h"
+
+// Arguments to use in execve() calls.
+static char* null_envp[] = {NULL};
+
+class Execve : public ::testing::Test {
+ public:
+ Execve() : exec_fd_(-1) {
+ // We need a program to exec(), but for fexecve() to work in capability
+ // mode that program needs to be statically linked (otherwise ld.so will
+ // attempt to traverse the filesystem to load (e.g.) /lib/libc.so and
+ // fail).
+ exec_prog_ = capsicum_test_bindir + "/mini-me";
+ exec_prog_noexec_ = capsicum_test_bindir + "/mini-me.noexec";
+ exec_prog_setuid_ = capsicum_test_bindir + "/mini-me.setuid";
+
+ exec_fd_ = open(exec_prog_.c_str(), O_RDONLY);
+ if (exec_fd_ < 0) {
+ fprintf(stderr, "Error! Failed to open %s\n", exec_prog_.c_str());
+ }
+ argv_checkroot_[0] = (char*)exec_prog_.c_str();
+ argv_fail_[0] = (char*)exec_prog_.c_str();
+ argv_pass_[0] = (char*)exec_prog_.c_str();
+ }
+ ~Execve() {
+ if (exec_fd_ >= 0) {
+ close(exec_fd_);
+ exec_fd_ = -1;
+ }
+ }
+protected:
+ char* argv_checkroot_[3] = {nullptr, (char*)"--checkroot", nullptr};
+ char* argv_fail_[3] = {nullptr, (char*)"--fail", nullptr};
+ char* argv_pass_[3] = {nullptr, (char*)"--pass", nullptr};
+ std::string exec_prog_, exec_prog_noexec_, exec_prog_setuid_;
+ int exec_fd_;
+};
+
+class Fexecve : public Execve {
+ public:
+ Fexecve() : Execve() {}
+};
+
+class FexecveWithScript : public Fexecve {
+ public:
+ FexecveWithScript() :
+ Fexecve(), temp_script_filename_(TmpFile("cap_sh_script")) {}
+
+ void SetUp() override {
+ // First, build an executable shell script
+ int fd = open(temp_script_filename_, O_RDWR|O_CREAT, 0755);
+ EXPECT_OK(fd);
+ const char* contents = "#!/bin/sh\nexit 99\n";
+ EXPECT_OK(write(fd, contents, strlen(contents)));
+ close(fd);
+ }
+ void TearDown() override {
+ (void)::unlink(temp_script_filename_);
+ }
+
+ const char *temp_script_filename_;
+};
+
+FORK_TEST_F(Execve, BasicFexecve) {
+ EXPECT_OK(fexecve_(exec_fd_, argv_pass_, null_envp));
+ // Should not reach here, exec() takes over.
+ EXPECT_TRUE(!"fexecve() should never return");
+}
+
+FORK_TEST_F(Execve, InCapMode) {
+ EXPECT_OK(cap_enter());
+ EXPECT_OK(fexecve_(exec_fd_, argv_pass_, null_envp));
+ // Should not reach here, exec() takes over.
+ EXPECT_TRUE(!"fexecve() should never return");
+}
+
+FORK_TEST_F(Execve, FailWithoutCap) {
+ EXPECT_OK(cap_enter());
+ int cap_fd = dup(exec_fd_);
+ EXPECT_OK(cap_fd);
+ cap_rights_t rights;
+ cap_rights_init(&rights, 0);
+ EXPECT_OK(cap_rights_limit(cap_fd, &rights));
+ EXPECT_EQ(-1, fexecve_(cap_fd, argv_fail_, null_envp));
+ EXPECT_EQ(ENOTCAPABLE, errno);
+}
+
+FORK_TEST_F(Execve, SucceedWithCap) {
+ EXPECT_OK(cap_enter());
+ int cap_fd = dup(exec_fd_);
+ EXPECT_OK(cap_fd);
+ cap_rights_t rights;
+ // TODO(drysdale): would prefer that Linux Capsicum not need all of these
+ // rights -- just CAP_FEXECVE|CAP_READ or CAP_FEXECVE would be preferable.
+ cap_rights_init(&rights, CAP_FEXECVE, CAP_LOOKUP, CAP_READ);
+ EXPECT_OK(cap_rights_limit(cap_fd, &rights));
+ EXPECT_OK(fexecve_(cap_fd, argv_pass_, null_envp));
+ // Should not reach here, exec() takes over.
+ EXPECT_TRUE(!"fexecve() should have succeeded");
+}
+
+FORK_TEST_F(Fexecve, ExecutePermissionCheck) {
+ int fd = open(exec_prog_noexec_.c_str(), O_RDONLY);
+ EXPECT_OK(fd);
+ if (fd >= 0) {
+ struct stat data;
+ EXPECT_OK(fstat(fd, &data));
+ EXPECT_EQ((mode_t)0, data.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH));
+ EXPECT_EQ(-1, fexecve_(fd, argv_fail_, null_envp));
+ EXPECT_EQ(EACCES, errno);
+ close(fd);
+ }
+}
+
+FORK_TEST_F(Fexecve, SetuidIgnored) {
+ if (geteuid() == 0) {
+ TEST_SKIPPED("requires non-root");
+ return;
+ }
+ int fd = open(exec_prog_setuid_.c_str(), O_RDONLY);
+ EXPECT_OK(fd);
+ EXPECT_OK(cap_enter());
+ if (fd >= 0) {
+ struct stat data;
+ EXPECT_OK(fstat(fd, &data));
+ EXPECT_EQ((mode_t)S_ISUID, data.st_mode & S_ISUID);
+ EXPECT_OK(fexecve_(fd, argv_checkroot_, null_envp));
+ // Should not reach here, exec() takes over.
+ EXPECT_TRUE(!"fexecve() should have succeeded");
+ close(fd);
+ }
+}
+
+FORK_TEST_F(Fexecve, ExecveFailure) {
+ EXPECT_OK(cap_enter());
+ EXPECT_EQ(-1, execve(argv_fail_[0], argv_fail_, null_envp));
+ EXPECT_EQ(ECAPMODE, errno);
+}
+
+FORK_TEST_F(FexecveWithScript, CapModeScriptFail) {
+ int fd;
+
+ // Open the script file, with CAP_FEXECVE rights.
+ fd = open(temp_script_filename_, O_RDONLY);
+ cap_rights_t rights;
+ cap_rights_init(&rights, CAP_FEXECVE, CAP_READ, CAP_SEEK);
+ EXPECT_OK(cap_rights_limit(fd, &rights));
+
+ EXPECT_OK(cap_enter()); // Enter capability mode
+
+ // Attempt fexecve; should fail, because "/bin/sh" is inaccessible.
+ EXPECT_EQ(-1, fexecve_(fd, argv_pass_, null_envp));
+}
+
+#ifdef HAVE_EXECVEAT
+TEST(Execveat, NoUpwardTraversal) {
+ char *abspath = realpath(exec_prog_, NULL);
+ char cwd[1024];
+ getcwd(cwd, sizeof(cwd));
+
+ int dfd = open(".", O_DIRECTORY|O_RDONLY);
+ pid_t child = fork();
+ if (child == 0) {
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+ // Can't execveat() an absolute path, even relative to a dfd.
+ EXPECT_SYSCALL_FAIL(ECAPMODE,
+ execveat(AT_FDCWD, abspath, argv_pass_, null_envp, 0));
+ EXPECT_SYSCALL_FAIL(E_NO_TRAVERSE_CAPABILITY,
+ execveat(dfd, abspath, argv_pass_, null_envp, 0));
+
+ // Can't execveat() a relative path ("../<dir>/./<exe>").
+ char *p = cwd + strlen(cwd);
+ while (*p != '/') p--;
+ char buffer[1024] = "../";
+ strcat(buffer, ++p);
+ strcat(buffer, "/");
+ strcat(buffer, exec_prog_);
+ EXPECT_SYSCALL_FAIL(E_NO_TRAVERSE_CAPABILITY,
+ execveat(dfd, buffer, argv_pass_, null_envp, 0));
+ exit(HasFailure() ? 99 : 123);
+ }
+ int status;
+ EXPECT_EQ(child, waitpid(child, &status, 0));
+ EXPECT_TRUE(WIFEXITED(status)) << "0x" << std::hex << status;
+ EXPECT_EQ(123, WEXITSTATUS(status));
+ free(abspath);
+ close(dfd);
+}
+#endif
Index: contrib/capsicum-test/ioctl.cc
===================================================================
--- /dev/null
+++ contrib/capsicum-test/ioctl.cc
@@ -0,0 +1,234 @@
+// Test that ioctl works in capability mode.
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+#include "capsicum.h"
+#include "capsicum-test.h"
+
+// Ensure that ioctl() works consistently for both regular file descriptors and
+// capability-wrapped ones.
+TEST(Ioctl, Basic) {
+ cap_rights_t rights_ioctl;
+ cap_rights_init(&rights_ioctl, CAP_IOCTL);
+ cap_rights_t rights_many;
+ cap_rights_init(&rights_many, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_FSTAT, CAP_FSYNC);
+
+ int fd = open("/etc/passwd", O_RDONLY);
+ EXPECT_OK(fd);
+ int fd_no = dup(fd);
+ EXPECT_OK(fd_no);
+ EXPECT_OK(cap_rights_limit(fd, &rights_ioctl));
+ EXPECT_OK(cap_rights_limit(fd_no, &rights_many));
+
+ // Check that CAP_IOCTL is required.
+ int bytes;
+ EXPECT_OK(ioctl(fd, FIONREAD, &bytes));
+ EXPECT_NOTCAPABLE(ioctl(fd_no, FIONREAD, &bytes));
+
+ int one = 1;
+ EXPECT_OK(ioctl(fd, FIOCLEX, &one));
+ EXPECT_NOTCAPABLE(ioctl(fd_no, FIOCLEX, &one));
+
+ close(fd);
+ close(fd_no);
+}
+
+#ifdef HAVE_CAP_IOCTLS_LIMIT
+TEST(Ioctl, SubRightNormalFD) {
+ int fd = open("/etc/passwd", O_RDONLY);
+ EXPECT_OK(fd);
+
+ // Restrict the ioctl(2) subrights of a normal FD.
+ cap_ioctl_t ioctl_nread = FIONREAD;
+ EXPECT_OK(cap_ioctls_limit(fd, &ioctl_nread, 1));
+ int bytes;
+ EXPECT_OK(ioctl(fd, FIONREAD, &bytes));
+ int one = 1;
+ EXPECT_NOTCAPABLE(ioctl(fd, FIOCLEX, &one));
+
+ // Expect to have all primary rights.
+ cap_rights_t rights;
+ EXPECT_OK(cap_rights_get(fd, &rights));
+ cap_rights_t all;
+ CAP_SET_ALL(&all);
+ EXPECT_RIGHTS_EQ(&all, &rights);
+ cap_ioctl_t ioctls[16];
+ memset(ioctls, 0, sizeof(ioctls));
+ ssize_t nioctls = cap_ioctls_get(fd, ioctls, 16);
+ EXPECT_OK(nioctls);
+ EXPECT_EQ(1, nioctls);
+ EXPECT_EQ((cap_ioctl_t)FIONREAD, ioctls[0]);
+
+ // Can't widen the subrights.
+ cap_ioctl_t both_ioctls[2] = {FIONREAD, FIOCLEX};
+ EXPECT_NOTCAPABLE(cap_ioctls_limit(fd, both_ioctls, 2));
+
+ close(fd);
+}
+
+TEST(Ioctl, PreserveSubRights) {
+ int fd = open("/etc/passwd", O_RDONLY);
+ EXPECT_OK(fd);
+ cap_rights_t rights;
+ cap_rights_init(&rights, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_IOCTL);
+ EXPECT_OK(cap_rights_limit(fd, &rights));
+ cap_ioctl_t ioctl_nread = FIONREAD;
+ EXPECT_OK(cap_ioctls_limit(fd, &ioctl_nread, 1));
+
+ cap_rights_t cur_rights;
+ cap_ioctl_t ioctls[16];
+ ssize_t nioctls;
+ EXPECT_OK(cap_rights_get(fd, &cur_rights));
+ EXPECT_RIGHTS_EQ(&rights, &cur_rights);
+ nioctls = cap_ioctls_get(fd, ioctls, 16);
+ EXPECT_OK(nioctls);
+ EXPECT_EQ(1, nioctls);
+ EXPECT_EQ((cap_ioctl_t)FIONREAD, ioctls[0]);
+
+ // Limiting the top-level rights leaves the subrights unaffected...
+ cap_rights_clear(&rights, CAP_READ);
+ EXPECT_OK(cap_rights_limit(fd, &rights));
+ nioctls = cap_ioctls_get(fd, ioctls, 16);
+ EXPECT_OK(nioctls);
+ EXPECT_EQ(1, nioctls);
+ EXPECT_EQ((cap_ioctl_t)FIONREAD, ioctls[0]);
+
+ // ... until we remove CAP_IOCTL
+ cap_rights_clear(&rights, CAP_IOCTL);
+ EXPECT_OK(cap_rights_limit(fd, &rights));
+ nioctls = cap_ioctls_get(fd, ioctls, 16);
+ EXPECT_OK(nioctls);
+ EXPECT_EQ(0, nioctls);
+ EXPECT_EQ(-1, cap_ioctls_limit(fd, &ioctl_nread, 1));
+
+ close(fd);
+}
+
+TEST(Ioctl, SubRights) {
+ int fd = open("/etc/passwd", O_RDONLY);
+ EXPECT_OK(fd);
+
+ cap_ioctl_t ioctls[16];
+ ssize_t nioctls;
+ memset(ioctls, 0, sizeof(ioctls));
+ nioctls = cap_ioctls_get(fd, ioctls, 16);
+ EXPECT_OK(nioctls);
+ EXPECT_EQ(CAP_IOCTLS_ALL, nioctls);
+
+ cap_rights_t rights_ioctl;
+ cap_rights_init(&rights_ioctl, CAP_IOCTL);
+ EXPECT_OK(cap_rights_limit(fd, &rights_ioctl));
+
+ nioctls = cap_ioctls_get(fd, ioctls, 16);
+ EXPECT_OK(nioctls);
+ EXPECT_EQ(CAP_IOCTLS_ALL, nioctls);
+
+ // Check operations that need CAP_IOCTL with subrights pristine => OK.
+ int bytes;
+ EXPECT_OK(ioctl(fd, FIONREAD, &bytes));
+ int one = 1;
+ EXPECT_OK(ioctl(fd, FIOCLEX, &one));
+
+ // Check operations that need CAP_IOCTL with all relevant subrights => OK.
+ cap_ioctl_t both_ioctls[2] = {FIONREAD, FIOCLEX};
+ EXPECT_OK(cap_ioctls_limit(fd, both_ioctls, 2));
+ EXPECT_OK(ioctl(fd, FIONREAD, &bytes));
+ EXPECT_OK(ioctl(fd, FIOCLEX, &one));
+
+
+ // Check what happens if we ask for subrights but don't have the space for them.
+ cap_ioctl_t before = 0xBBBBBBBB;
+ cap_ioctl_t one_ioctl = 0;
+ cap_ioctl_t after = 0xAAAAAAAA;
+ nioctls = cap_ioctls_get(fd, &one_ioctl, 1);
+ EXPECT_EQ(2, nioctls);
+ EXPECT_EQ(0xBBBBBBBB, before);
+ EXPECT_TRUE(one_ioctl == FIONREAD || one_ioctl == FIOCLEX);
+ EXPECT_EQ(0xAAAAAAAA, after);
+
+ // Check operations that need CAP_IOCTL with particular subrights.
+ int fd_nread = dup(fd);
+ int fd_clex = dup(fd);
+ cap_ioctl_t ioctl_nread = FIONREAD;
+ cap_ioctl_t ioctl_clex = FIOCLEX;
+ EXPECT_OK(cap_ioctls_limit(fd_nread, &ioctl_nread, 1));
+ EXPECT_OK(cap_ioctls_limit(fd_clex, &ioctl_clex, 1));
+ EXPECT_OK(ioctl(fd_nread, FIONREAD, &bytes));
+ EXPECT_NOTCAPABLE(ioctl(fd_clex, FIONREAD, &bytes));
+ EXPECT_OK(ioctl(fd_clex, FIOCLEX, &one));
+ EXPECT_NOTCAPABLE(ioctl(fd_nread, FIOCLEX, &one));
+
+ // Also check we can retrieve the subrights.
+ memset(ioctls, 0, sizeof(ioctls));
+ nioctls = cap_ioctls_get(fd_nread, ioctls, 16);
+ EXPECT_OK(nioctls);
+ EXPECT_EQ(1, nioctls);
+ EXPECT_EQ((cap_ioctl_t)FIONREAD, ioctls[0]);
+ memset(ioctls, 0, sizeof(ioctls));
+ nioctls = cap_ioctls_get(fd_clex, ioctls, 16);
+ EXPECT_OK(nioctls);
+ EXPECT_EQ(1, nioctls);
+ EXPECT_EQ((cap_ioctl_t)FIOCLEX, ioctls[0]);
+ // And that we can't widen the subrights.
+ EXPECT_NOTCAPABLE(cap_ioctls_limit(fd_nread, both_ioctls, 2));
+ EXPECT_NOTCAPABLE(cap_ioctls_limit(fd_clex, both_ioctls, 2));
+ close(fd_nread);
+ close(fd_clex);
+
+ // Check operations that need CAP_IOCTL with no subrights => ENOTCAPABLE.
+ EXPECT_OK(cap_ioctls_limit(fd, NULL, 0));
+ EXPECT_NOTCAPABLE(ioctl(fd, FIONREAD, &bytes));
+ EXPECT_NOTCAPABLE(ioctl(fd, FIOCLEX, &one));
+
+ close(fd);
+}
+
+#ifdef CAP_IOCTLS_LIMIT_MAX
+TEST(Ioctl, TooManySubRights) {
+ int fd = open("/etc/passwd", O_RDONLY);
+ EXPECT_OK(fd);
+
+ cap_ioctl_t ioctls[CAP_IOCTLS_LIMIT_MAX + 1];
+ for (int ii = 0; ii <= CAP_IOCTLS_LIMIT_MAX; ii++) {
+ ioctls[ii] = ii + 1;
+ }
+
+ cap_rights_t rights_ioctl;
+ cap_rights_init(&rights_ioctl, CAP_IOCTL);
+ EXPECT_OK(cap_rights_limit(fd, &rights_ioctl));
+
+ // Can only limit to a certain number of ioctls
+ EXPECT_EQ(-1, cap_ioctls_limit(fd, ioctls, CAP_IOCTLS_LIMIT_MAX + 1));
+ EXPECT_EQ(EINVAL, errno);
+ EXPECT_OK(cap_ioctls_limit(fd, ioctls, CAP_IOCTLS_LIMIT_MAX));
+
+ close(fd);
+}
+#else
+TEST(Ioctl, ManySubRights) {
+ int fd = open("/etc/passwd", O_RDONLY);
+ EXPECT_OK(fd);
+
+ const int nioctls = 150000;
+ cap_ioctl_t* ioctls = (cap_ioctl_t*)calloc(nioctls, sizeof(cap_ioctl_t));
+ for (int ii = 0; ii < nioctls; ii++) {
+ ioctls[ii] = ii + 1;
+ }
+
+ cap_rights_t rights_ioctl;
+ cap_rights_init(&rights_ioctl, CAP_IOCTL);
+ EXPECT_OK(cap_rights_limit(fd, &rights_ioctl));
+
+ EXPECT_OK(cap_ioctls_limit(fd, ioctls, nioctls));
+ // Limit to a subset; if this takes a long time then there's an
+ // O(N^2) implementation of the ioctl list comparison.
+ EXPECT_OK(cap_ioctls_limit(fd, ioctls, nioctls - 1));
+
+ close(fd);
+}
+#endif
+
+#endif
Index: contrib/capsicum-test/linux.cc
===================================================================
--- /dev/null
+++ contrib/capsicum-test/linux.cc
@@ -0,0 +1,1503 @@
+// Tests of Linux-specific functionality
+#ifdef __linux__
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/timerfd.h>
+#include <sys/signalfd.h>
+#include <sys/eventfd.h>
+#include <sys/epoll.h>
+#include <sys/inotify.h>
+#include <sys/fanotify.h>
+#include <sys/mman.h>
+#include <sys/capability.h> // Requires e.g. libcap-dev package for POSIX.1e capabilities headers
+#include <linux/aio_abi.h>
+#include <linux/filter.h>
+#include <linux/seccomp.h>
+#include <linux/version.h>
+#include <poll.h>
+#include <sched.h>
+#include <signal.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include <string>
+
+#include "capsicum.h"
+#include "syscalls.h"
+#include "capsicum-test.h"
+
+TEST(Linux, TimerFD) {
+ int fd = timerfd_create(CLOCK_MONOTONIC, 0);
+
+ cap_rights_t r_ro;
+ cap_rights_init(&r_ro, CAP_READ);
+ cap_rights_t r_wo;
+ cap_rights_init(&r_wo, CAP_WRITE);
+ cap_rights_t r_rw;
+ cap_rights_init(&r_rw, CAP_READ, CAP_WRITE);
+ cap_rights_t r_rwpoll;
+ cap_rights_init(&r_rwpoll, CAP_READ, CAP_WRITE, CAP_EVENT);
+
+ int cap_fd_ro = dup(fd);
+ EXPECT_OK(cap_fd_ro);
+ EXPECT_OK(cap_rights_limit(cap_fd_ro, &r_ro));
+ int cap_fd_wo = dup(fd);
+ EXPECT_OK(cap_fd_wo);
+ EXPECT_OK(cap_rights_limit(cap_fd_wo, &r_wo));
+ int cap_fd_rw = dup(fd);
+ EXPECT_OK(cap_fd_rw);
+ EXPECT_OK(cap_rights_limit(cap_fd_rw, &r_rw));
+ int cap_fd_all = dup(fd);
+ EXPECT_OK(cap_fd_all);
+ EXPECT_OK(cap_rights_limit(cap_fd_all, &r_rwpoll));
+
+ struct itimerspec old_ispec;
+ struct itimerspec ispec;
+ ispec.it_interval.tv_sec = 0;
+ ispec.it_interval.tv_nsec = 0;
+ ispec.it_value.tv_sec = 0;
+ ispec.it_value.tv_nsec = 100000000; // 100ms
+ EXPECT_NOTCAPABLE(timerfd_settime(cap_fd_ro, 0, &ispec, NULL));
+ EXPECT_NOTCAPABLE(timerfd_settime(cap_fd_wo, 0, &ispec, &old_ispec));
+ EXPECT_OK(timerfd_settime(cap_fd_wo, 0, &ispec, NULL));
+ EXPECT_OK(timerfd_settime(cap_fd_rw, 0, &ispec, NULL));
+ EXPECT_OK(timerfd_settime(cap_fd_all, 0, &ispec, NULL));
+
+ EXPECT_NOTCAPABLE(timerfd_gettime(cap_fd_wo, &old_ispec));
+ EXPECT_OK(timerfd_gettime(cap_fd_ro, &old_ispec));
+ EXPECT_OK(timerfd_gettime(cap_fd_rw, &old_ispec));
+ EXPECT_OK(timerfd_gettime(cap_fd_all, &old_ispec));
+
+ // To be able to poll() for the timer pop, still need CAP_EVENT.
+ struct pollfd poll_fd;
+ for (int ii = 0; ii < 3; ii++) {
+ poll_fd.revents = 0;
+ poll_fd.events = POLLIN;
+ switch (ii) {
+ case 0: poll_fd.fd = cap_fd_ro; break;
+ case 1: poll_fd.fd = cap_fd_wo; break;
+ case 2: poll_fd.fd = cap_fd_rw; break;
+ }
+ // Poll immediately returns with POLLNVAL
+ EXPECT_OK(poll(&poll_fd, 1, 400));
+ EXPECT_EQ(0, (poll_fd.revents & POLLIN));
+ EXPECT_NE(0, (poll_fd.revents & POLLNVAL));
+ }
+
+ poll_fd.fd = cap_fd_all;
+ EXPECT_OK(poll(&poll_fd, 1, 400));
+ EXPECT_NE(0, (poll_fd.revents & POLLIN));
+ EXPECT_EQ(0, (poll_fd.revents & POLLNVAL));
+
+ EXPECT_OK(timerfd_gettime(cap_fd_all, &old_ispec));
+ EXPECT_EQ(0, old_ispec.it_value.tv_sec);
+ EXPECT_EQ(0, old_ispec.it_value.tv_nsec);
+ EXPECT_EQ(0, old_ispec.it_interval.tv_sec);
+ EXPECT_EQ(0, old_ispec.it_interval.tv_nsec);
+
+ close(cap_fd_all);
+ close(cap_fd_rw);
+ close(cap_fd_wo);
+ close(cap_fd_ro);
+ close(fd);
+}
+
+FORK_TEST(Linux, SignalFD) {
+ if (force_mt) {
+ TEST_SKIPPED("multi-threaded run clashes with signals");
+ return;
+ }
+ pid_t me = getpid();
+ sigset_t mask;
+ sigemptyset(&mask);
+ sigaddset(&mask, SIGUSR1);
+
+ // Block signals before registering against a new signal FD.
+ EXPECT_OK(sigprocmask(SIG_BLOCK, &mask, NULL));
+ int fd = signalfd(-1, &mask, 0);
+ EXPECT_OK(fd);
+
+ cap_rights_t r_rs;
+ cap_rights_init(&r_rs, CAP_READ, CAP_SEEK);
+ cap_rights_t r_ws;
+ cap_rights_init(&r_ws, CAP_WRITE, CAP_SEEK);
+ cap_rights_t r_sig;
+ cap_rights_init(&r_sig, CAP_FSIGNAL);
+ cap_rights_t r_rssig;
+ cap_rights_init(&r_rssig, CAP_FSIGNAL, CAP_READ, CAP_SEEK);
+ cap_rights_t r_rssig_poll;
+ cap_rights_init(&r_rssig_poll, CAP_FSIGNAL, CAP_READ, CAP_SEEK, CAP_EVENT);
+
+ // Various capability variants.
+ int cap_fd_none = dup(fd);
+ EXPECT_OK(cap_fd_none);
+ EXPECT_OK(cap_rights_limit(cap_fd_none, &r_ws));
+ int cap_fd_read = dup(fd);
+ EXPECT_OK(cap_fd_read);
+ EXPECT_OK(cap_rights_limit(cap_fd_read, &r_rs));
+ int cap_fd_sig = dup(fd);
+ EXPECT_OK(cap_fd_sig);
+ EXPECT_OK(cap_rights_limit(cap_fd_sig, &r_sig));
+ int cap_fd_sig_read = dup(fd);
+ EXPECT_OK(cap_fd_sig_read);
+ EXPECT_OK(cap_rights_limit(cap_fd_sig_read, &r_rssig));
+ int cap_fd_all = dup(fd);
+ EXPECT_OK(cap_fd_all);
+ EXPECT_OK(cap_rights_limit(cap_fd_all, &r_rssig_poll));
+
+ struct signalfd_siginfo fdsi;
+
+ // Need CAP_READ to read the signal information
+ kill(me, SIGUSR1);
+ EXPECT_NOTCAPABLE(read(cap_fd_none, &fdsi, sizeof(struct signalfd_siginfo)));
+ EXPECT_NOTCAPABLE(read(cap_fd_sig, &fdsi, sizeof(struct signalfd_siginfo)));
+ int len = read(cap_fd_read, &fdsi, sizeof(struct signalfd_siginfo));
+ EXPECT_OK(len);
+ EXPECT_EQ(sizeof(struct signalfd_siginfo), (size_t)len);
+ EXPECT_EQ(SIGUSR1, (int)fdsi.ssi_signo);
+
+ // Need CAP_FSIGNAL to modify the signal mask.
+ sigemptyset(&mask);
+ sigaddset(&mask, SIGUSR1);
+ sigaddset(&mask, SIGUSR2);
+ EXPECT_OK(sigprocmask(SIG_BLOCK, &mask, NULL));
+ EXPECT_NOTCAPABLE(signalfd(cap_fd_none, &mask, 0));
+ EXPECT_NOTCAPABLE(signalfd(cap_fd_read, &mask, 0));
+ EXPECT_EQ(cap_fd_sig, signalfd(cap_fd_sig, &mask, 0));
+
+ // Need CAP_EVENT to get notification of a signal in poll(2).
+ kill(me, SIGUSR2);
+
+ struct pollfd poll_fd;
+ poll_fd.revents = 0;
+ poll_fd.events = POLLIN;
+ poll_fd.fd = cap_fd_sig_read;
+ EXPECT_OK(poll(&poll_fd, 1, 400));
+ EXPECT_EQ(0, (poll_fd.revents & POLLIN));
+ EXPECT_NE(0, (poll_fd.revents & POLLNVAL));
+
+ poll_fd.fd = cap_fd_all;
+ EXPECT_OK(poll(&poll_fd, 1, 400));
+ EXPECT_NE(0, (poll_fd.revents & POLLIN));
+ EXPECT_EQ(0, (poll_fd.revents & POLLNVAL));
+}
+
+TEST(Linux, EventFD) {
+ int fd = eventfd(0, 0);
+ EXPECT_OK(fd);
+
+ cap_rights_t r_rs;
+ cap_rights_init(&r_rs, CAP_READ, CAP_SEEK);
+ cap_rights_t r_ws;
+ cap_rights_init(&r_ws, CAP_WRITE, CAP_SEEK);
+ cap_rights_t r_rws;
+ cap_rights_init(&r_rws, CAP_READ, CAP_WRITE, CAP_SEEK);
+ cap_rights_t r_rwspoll;
+ cap_rights_init(&r_rwspoll, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_EVENT);
+
+ int cap_ro = dup(fd);
+ EXPECT_OK(cap_ro);
+ EXPECT_OK(cap_rights_limit(cap_ro, &r_rs));
+ int cap_wo = dup(fd);
+ EXPECT_OK(cap_wo);
+ EXPECT_OK(cap_rights_limit(cap_wo, &r_ws));
+ int cap_rw = dup(fd);
+ EXPECT_OK(cap_rw);
+ EXPECT_OK(cap_rights_limit(cap_rw, &r_rws));
+ int cap_all = dup(fd);
+ EXPECT_OK(cap_all);
+ EXPECT_OK(cap_rights_limit(cap_all, &r_rwspoll));
+
+ pid_t child = fork();
+ if (child == 0) {
+ // Child: write counter to eventfd
+ uint64_t u = 42;
+ EXPECT_NOTCAPABLE(write(cap_ro, &u, sizeof(u)));
+ EXPECT_OK(write(cap_wo, &u, sizeof(u)));
+ exit(HasFailure());
+ }
+
+ sleep(1); // Allow child to write
+
+ struct pollfd poll_fd;
+ poll_fd.revents = 0;
+ poll_fd.events = POLLIN;
+ poll_fd.fd = cap_rw;
+ EXPECT_OK(poll(&poll_fd, 1, 400));
+ EXPECT_EQ(0, (poll_fd.revents & POLLIN));
+ EXPECT_NE(0, (poll_fd.revents & POLLNVAL));
+
+ poll_fd.fd = cap_all;
+ EXPECT_OK(poll(&poll_fd, 1, 400));
+ EXPECT_NE(0, (poll_fd.revents & POLLIN));
+ EXPECT_EQ(0, (poll_fd.revents & POLLNVAL));
+
+ uint64_t u;
+ EXPECT_NOTCAPABLE(read(cap_wo, &u, sizeof(u)));
+ EXPECT_OK(read(cap_ro, &u, sizeof(u)));
+ EXPECT_EQ(42, (int)u);
+
+ // Wait for the child.
+ int status;
+ EXPECT_EQ(child, waitpid(child, &status, 0));
+ int rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
+ EXPECT_EQ(0, rc);
+
+ close(cap_all);
+ close(cap_rw);
+ close(cap_wo);
+ close(cap_ro);
+ close(fd);
+}
+
+FORK_TEST(Linux, epoll) {
+ int sock_fds[2];
+ EXPECT_OK(socketpair(AF_UNIX, SOCK_STREAM, 0, sock_fds));
+ // Queue some data.
+ char buffer[4] = {1, 2, 3, 4};
+ EXPECT_OK(write(sock_fds[1], buffer, sizeof(buffer)));
+
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+
+ int epoll_fd = epoll_create(1);
+ EXPECT_OK(epoll_fd);
+
+ cap_rights_t r_rs;
+ cap_rights_init(&r_rs, CAP_READ, CAP_SEEK);
+ cap_rights_t r_ws;
+ cap_rights_init(&r_ws, CAP_WRITE, CAP_SEEK);
+ cap_rights_t r_rws;
+ cap_rights_init(&r_rws, CAP_READ, CAP_WRITE, CAP_SEEK);
+ cap_rights_t r_rwspoll;
+ cap_rights_init(&r_rwspoll, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_EVENT);
+ cap_rights_t r_epoll;
+ cap_rights_init(&r_epoll, CAP_EPOLL_CTL);
+
+ int cap_epoll_wo = dup(epoll_fd);
+ EXPECT_OK(cap_epoll_wo);
+ EXPECT_OK(cap_rights_limit(cap_epoll_wo, &r_ws));
+ int cap_epoll_ro = dup(epoll_fd);
+ EXPECT_OK(cap_epoll_ro);
+ EXPECT_OK(cap_rights_limit(cap_epoll_ro, &r_rs));
+ int cap_epoll_rw = dup(epoll_fd);
+ EXPECT_OK(cap_epoll_rw);
+ EXPECT_OK(cap_rights_limit(cap_epoll_rw, &r_rws));
+ int cap_epoll_poll = dup(epoll_fd);
+ EXPECT_OK(cap_epoll_poll);
+ EXPECT_OK(cap_rights_limit(cap_epoll_poll, &r_rwspoll));
+ int cap_epoll_ctl = dup(epoll_fd);
+ EXPECT_OK(cap_epoll_ctl);
+ EXPECT_OK(cap_rights_limit(cap_epoll_ctl, &r_epoll));
+
+ // Can only modify the FDs being monitored if the CAP_EPOLL_CTL right is present.
+ struct epoll_event eev;
+ memset(&eev, 0, sizeof(eev));
+ eev.events = EPOLLIN|EPOLLOUT|EPOLLPRI;
+ EXPECT_NOTCAPABLE(epoll_ctl(cap_epoll_ro, EPOLL_CTL_ADD, sock_fds[0], &eev));
+ EXPECT_NOTCAPABLE(epoll_ctl(cap_epoll_wo, EPOLL_CTL_ADD, sock_fds[0], &eev));
+ EXPECT_NOTCAPABLE(epoll_ctl(cap_epoll_rw, EPOLL_CTL_ADD, sock_fds[0], &eev));
+ EXPECT_OK(epoll_ctl(cap_epoll_ctl, EPOLL_CTL_ADD, sock_fds[0], &eev));
+ eev.events = EPOLLIN|EPOLLOUT;
+ EXPECT_NOTCAPABLE(epoll_ctl(cap_epoll_ro, EPOLL_CTL_MOD, sock_fds[0], &eev));
+ EXPECT_NOTCAPABLE(epoll_ctl(cap_epoll_wo, EPOLL_CTL_MOD, sock_fds[0], &eev));
+ EXPECT_NOTCAPABLE(epoll_ctl(cap_epoll_rw, EPOLL_CTL_MOD, sock_fds[0], &eev));
+ EXPECT_OK(epoll_ctl(cap_epoll_ctl, EPOLL_CTL_MOD, sock_fds[0], &eev));
+
+ // Running epoll_pwait(2) requires CAP_EVENT.
+ eev.events = 0;
+ EXPECT_NOTCAPABLE(epoll_pwait(cap_epoll_ro, &eev, 1, 100, NULL));
+ EXPECT_NOTCAPABLE(epoll_pwait(cap_epoll_wo, &eev, 1, 100, NULL));
+ EXPECT_NOTCAPABLE(epoll_pwait(cap_epoll_rw, &eev, 1, 100, NULL));
+ EXPECT_OK(epoll_pwait(cap_epoll_poll, &eev, 1, 100, NULL));
+ EXPECT_EQ(EPOLLIN, eev.events & EPOLLIN);
+
+ EXPECT_NOTCAPABLE(epoll_ctl(cap_epoll_ro, EPOLL_CTL_DEL, sock_fds[0], &eev));
+ EXPECT_NOTCAPABLE(epoll_ctl(cap_epoll_wo, EPOLL_CTL_DEL, sock_fds[0], &eev));
+ EXPECT_NOTCAPABLE(epoll_ctl(cap_epoll_rw, EPOLL_CTL_DEL, sock_fds[0], &eev));
+ EXPECT_OK(epoll_ctl(epoll_fd, EPOLL_CTL_DEL, sock_fds[0], &eev));
+
+ close(cap_epoll_ctl);
+ close(cap_epoll_poll);
+ close(cap_epoll_rw);
+ close(cap_epoll_ro);
+ close(cap_epoll_wo);
+ close(epoll_fd);
+ close(sock_fds[1]);
+ close(sock_fds[0]);
+}
+
+TEST(Linux, fstatat) {
+ int fd = open(TmpFile("cap_fstatat"), O_CREAT|O_RDWR, 0644);
+ EXPECT_OK(fd);
+ unsigned char buffer[] = {1, 2, 3, 4};
+ EXPECT_OK(write(fd, buffer, sizeof(buffer)));
+ cap_rights_t rights;
+ int cap_rf = dup(fd);
+ EXPECT_OK(cap_rf);
+ EXPECT_OK(cap_rights_limit(cap_rf, cap_rights_init(&rights, CAP_READ, CAP_FSTAT)));
+ int cap_ro = dup(fd);
+ EXPECT_OK(cap_ro);
+ EXPECT_OK(cap_rights_limit(cap_ro, cap_rights_init(&rights, CAP_READ)));
+
+ struct stat info;
+ EXPECT_OK(fstatat(fd, "", &info, AT_EMPTY_PATH));
+ EXPECT_NOTCAPABLE(fstatat(cap_ro, "", &info, AT_EMPTY_PATH));
+ EXPECT_OK(fstatat(cap_rf, "", &info, AT_EMPTY_PATH));
+
+ close(cap_ro);
+ close(cap_rf);
+ close(fd);
+
+ int dir = open(tmpdir.c_str(), O_RDONLY);
+ EXPECT_OK(dir);
+ int dir_rf = dup(dir);
+ EXPECT_OK(dir_rf);
+ EXPECT_OK(cap_rights_limit(dir_rf, cap_rights_init(&rights, CAP_READ, CAP_FSTAT)));
+ int dir_ro = dup(fd);
+ EXPECT_OK(dir_ro);
+ EXPECT_OK(cap_rights_limit(dir_ro, cap_rights_init(&rights, CAP_READ)));
+
+ EXPECT_OK(fstatat(dir, "cap_fstatat", &info, AT_EMPTY_PATH));
+ EXPECT_NOTCAPABLE(fstatat(dir_ro, "cap_fstatat", &info, AT_EMPTY_PATH));
+ EXPECT_OK(fstatat(dir_rf, "cap_fstatat", &info, AT_EMPTY_PATH));
+
+ close(dir_ro);
+ close(dir_rf);
+ close(dir);
+
+ unlink(TmpFile("cap_fstatat"));
+}
+
+// fanotify support may not be available at compile-time
+#ifdef __NR_fanotify_init
+TEST(Linux, fanotify) {
+ REQUIRE_ROOT();
+ int fa_fd = fanotify_init(FAN_CLASS_NOTIF, O_RDWR);
+ EXPECT_OK(fa_fd);
+ if (fa_fd < 0) return; // May not be enabled
+
+ cap_rights_t r_rs;
+ cap_rights_init(&r_rs, CAP_READ, CAP_SEEK);
+ cap_rights_t r_ws;
+ cap_rights_init(&r_ws, CAP_WRITE, CAP_SEEK);
+ cap_rights_t r_rws;
+ cap_rights_init(&r_rws, CAP_READ, CAP_WRITE, CAP_SEEK);
+ cap_rights_t r_rwspoll;
+ cap_rights_init(&r_rwspoll, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_EVENT);
+ cap_rights_t r_rwsnotify;
+ cap_rights_init(&r_rwsnotify, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_NOTIFY);
+ cap_rights_t r_rsl;
+ cap_rights_init(&r_rsl, CAP_READ, CAP_SEEK, CAP_LOOKUP);
+ cap_rights_t r_rslstat;
+ cap_rights_init(&r_rslstat, CAP_READ, CAP_SEEK, CAP_LOOKUP, CAP_FSTAT);
+ cap_rights_t r_rsstat;
+ cap_rights_init(&r_rsstat, CAP_READ, CAP_SEEK, CAP_FSTAT);
+
+ int cap_fd_ro = dup(fa_fd);
+ EXPECT_OK(cap_fd_ro);
+ EXPECT_OK(cap_rights_limit(cap_fd_ro, &r_rs));
+ int cap_fd_wo = dup(fa_fd);
+ EXPECT_OK(cap_fd_wo);
+ EXPECT_OK(cap_rights_limit(cap_fd_wo, &r_ws));
+ int cap_fd_rw = dup(fa_fd);
+ EXPECT_OK(cap_fd_rw);
+ EXPECT_OK(cap_rights_limit(cap_fd_rw, &r_rws));
+ int cap_fd_poll = dup(fa_fd);
+ EXPECT_OK(cap_fd_poll);
+ EXPECT_OK(cap_rights_limit(cap_fd_poll, &r_rwspoll));
+ int cap_fd_not = dup(fa_fd);
+ EXPECT_OK(cap_fd_not);
+ EXPECT_OK(cap_rights_limit(cap_fd_not, &r_rwsnotify));
+
+ int rc = mkdir(TmpFile("cap_notify"), 0755);
+ EXPECT_TRUE(rc == 0 || errno == EEXIST);
+ int dfd = open(TmpFile("cap_notify"), O_RDONLY);
+ EXPECT_OK(dfd);
+ int fd = open(TmpFile("cap_notify/file"), O_CREAT|O_RDWR, 0644);
+ close(fd);
+ int cap_dfd = dup(dfd);
+ EXPECT_OK(cap_dfd);
+ EXPECT_OK(cap_rights_limit(cap_dfd, &r_rslstat));
+ EXPECT_OK(cap_dfd);
+ int cap_dfd_rs = dup(dfd);
+ EXPECT_OK(cap_dfd_rs);
+ EXPECT_OK(cap_rights_limit(cap_dfd_rs, &r_rs));
+ EXPECT_OK(cap_dfd_rs);
+ int cap_dfd_rsstat = dup(dfd);
+ EXPECT_OK(cap_dfd_rsstat);
+ EXPECT_OK(cap_rights_limit(cap_dfd_rsstat, &r_rsstat));
+ EXPECT_OK(cap_dfd_rsstat);
+ int cap_dfd_rsl = dup(dfd);
+ EXPECT_OK(cap_dfd_rsl);
+ EXPECT_OK(cap_rights_limit(cap_dfd_rsl, &r_rsl));
+ EXPECT_OK(cap_dfd_rsl);
+
+ // Need CAP_NOTIFY to change what's monitored.
+ EXPECT_NOTCAPABLE(fanotify_mark(cap_fd_ro, FAN_MARK_ADD, FAN_OPEN|FAN_MODIFY|FAN_EVENT_ON_CHILD, cap_dfd, NULL));
+ EXPECT_NOTCAPABLE(fanotify_mark(cap_fd_wo, FAN_MARK_ADD, FAN_OPEN|FAN_MODIFY|FAN_EVENT_ON_CHILD, cap_dfd, NULL));
+ EXPECT_NOTCAPABLE(fanotify_mark(cap_fd_rw, FAN_MARK_ADD, FAN_OPEN|FAN_MODIFY|FAN_EVENT_ON_CHILD, cap_dfd, NULL));
+ EXPECT_OK(fanotify_mark(cap_fd_not, FAN_MARK_ADD, FAN_OPEN|FAN_MODIFY|FAN_EVENT_ON_CHILD, cap_dfd, NULL));
+
+ // Need CAP_FSTAT on the thing monitored.
+ EXPECT_NOTCAPABLE(fanotify_mark(cap_fd_not, FAN_MARK_ADD, FAN_OPEN|FAN_MODIFY|FAN_EVENT_ON_CHILD, cap_dfd_rs, NULL));
+ EXPECT_OK(fanotify_mark(cap_fd_not, FAN_MARK_ADD, FAN_OPEN|FAN_MODIFY|FAN_EVENT_ON_CHILD, cap_dfd_rsstat, NULL));
+
+ // Too add monitoring of a file under a dfd, need CAP_LOOKUP|CAP_FSTAT on the dfd.
+ EXPECT_NOTCAPABLE(fanotify_mark(cap_fd_not, FAN_MARK_ADD, FAN_OPEN|FAN_MODIFY, cap_dfd_rsstat, "file"));
+ EXPECT_NOTCAPABLE(fanotify_mark(cap_fd_not, FAN_MARK_ADD, FAN_OPEN|FAN_MODIFY, cap_dfd_rsl, "file"));
+ EXPECT_OK(fanotify_mark(cap_fd_not, FAN_MARK_ADD, FAN_OPEN|FAN_MODIFY, cap_dfd, "file"));
+
+ pid_t child = fork();
+ if (child == 0) {
+ // Child: Perform activity in the directory under notify.
+ sleep(1);
+ unlink(TmpFile("cap_notify/temp"));
+ int fd = open(TmpFile("cap_notify/temp"), O_CREAT|O_RDWR, 0644);
+ close(fd);
+ exit(0);
+ }
+
+ // Need CAP_EVENT to poll.
+ struct pollfd poll_fd;
+ poll_fd.revents = 0;
+ poll_fd.events = POLLIN;
+ poll_fd.fd = cap_fd_rw;
+ EXPECT_OK(poll(&poll_fd, 1, 1400));
+ EXPECT_EQ(0, (poll_fd.revents & POLLIN));
+ EXPECT_NE(0, (poll_fd.revents & POLLNVAL));
+
+ poll_fd.fd = cap_fd_not;
+ EXPECT_OK(poll(&poll_fd, 1, 1400));
+ EXPECT_EQ(0, (poll_fd.revents & POLLIN));
+ EXPECT_NE(0, (poll_fd.revents & POLLNVAL));
+
+ poll_fd.fd = cap_fd_poll;
+ EXPECT_OK(poll(&poll_fd, 1, 1400));
+ EXPECT_NE(0, (poll_fd.revents & POLLIN));
+ EXPECT_EQ(0, (poll_fd.revents & POLLNVAL));
+
+ // Need CAP_READ to read.
+ struct fanotify_event_metadata ev;
+ memset(&ev, 0, sizeof(ev));
+ EXPECT_NOTCAPABLE(read(cap_fd_wo, &ev, sizeof(ev)));
+ rc = read(fa_fd, &ev, sizeof(ev));
+ EXPECT_OK(rc);
+ EXPECT_EQ((int)sizeof(struct fanotify_event_metadata), rc);
+ EXPECT_EQ(child, ev.pid);
+ EXPECT_NE(0, ev.fd);
+
+ // TODO(drysdale): reinstate if/when capsicum-linux propagates rights
+ // to fanotify-generated FDs.
+#ifdef OMIT
+ // fanotify(7) gives us a FD for the changed file. This should
+ // only have rights that are a subset of those for the original
+ // monitored directory file descriptor.
+ cap_rights_t rights;
+ CAP_SET_ALL(&rights);
+ EXPECT_OK(cap_rights_get(ev.fd, &rights));
+ EXPECT_RIGHTS_IN(&rights, &r_rslstat);
+#endif
+
+ // Wait for the child.
+ int status;
+ EXPECT_EQ(child, waitpid(child, &status, 0));
+ rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
+ EXPECT_EQ(0, rc);
+
+ close(cap_dfd_rsstat);
+ close(cap_dfd_rsl);
+ close(cap_dfd_rs);
+ close(cap_dfd);
+ close(dfd);
+ unlink(TmpFile("cap_notify/file"));
+ unlink(TmpFile("cap_notify/temp"));
+ rmdir(TmpFile("cap_notify"));
+ close(cap_fd_not);
+ close(cap_fd_poll);
+ close(cap_fd_rw);
+ close(cap_fd_wo);
+ close(cap_fd_ro);
+ close(fa_fd);
+}
+#endif
+
+TEST(Linux, inotify) {
+ int i_fd = inotify_init();
+ EXPECT_OK(i_fd);
+
+ cap_rights_t r_rs;
+ cap_rights_init(&r_rs, CAP_READ, CAP_SEEK);
+ cap_rights_t r_ws;
+ cap_rights_init(&r_ws, CAP_WRITE, CAP_SEEK);
+ cap_rights_t r_rws;
+ cap_rights_init(&r_rws, CAP_READ, CAP_WRITE, CAP_SEEK);
+ cap_rights_t r_rwsnotify;
+ cap_rights_init(&r_rwsnotify, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_NOTIFY);
+
+ int cap_fd_ro = dup(i_fd);
+ EXPECT_OK(cap_fd_ro);
+ EXPECT_OK(cap_rights_limit(cap_fd_ro, &r_rs));
+ int cap_fd_wo = dup(i_fd);
+ EXPECT_OK(cap_fd_wo);
+ EXPECT_OK(cap_rights_limit(cap_fd_wo, &r_ws));
+ int cap_fd_rw = dup(i_fd);
+ EXPECT_OK(cap_fd_rw);
+ EXPECT_OK(cap_rights_limit(cap_fd_rw, &r_rws));
+ int cap_fd_all = dup(i_fd);
+ EXPECT_OK(cap_fd_all);
+ EXPECT_OK(cap_rights_limit(cap_fd_all, &r_rwsnotify));
+
+ int fd = open(TmpFile("cap_inotify"), O_CREAT|O_RDWR, 0644);
+ EXPECT_NOTCAPABLE(inotify_add_watch(cap_fd_rw, TmpFile("cap_inotify"), IN_ACCESS|IN_MODIFY));
+ int wd = inotify_add_watch(i_fd, TmpFile("cap_inotify"), IN_ACCESS|IN_MODIFY);
+ EXPECT_OK(wd);
+
+ unsigned char buffer[] = {1, 2, 3, 4};
+ EXPECT_OK(write(fd, buffer, sizeof(buffer)));
+
+ struct inotify_event iev;
+ memset(&iev, 0, sizeof(iev));
+ EXPECT_NOTCAPABLE(read(cap_fd_wo, &iev, sizeof(iev)));
+ int rc = read(cap_fd_ro, &iev, sizeof(iev));
+ EXPECT_OK(rc);
+ EXPECT_EQ((int)sizeof(iev), rc);
+ EXPECT_EQ(wd, iev.wd);
+
+ EXPECT_NOTCAPABLE(inotify_rm_watch(cap_fd_wo, wd));
+ EXPECT_OK(inotify_rm_watch(cap_fd_all, wd));
+
+ close(fd);
+ close(cap_fd_all);
+ close(cap_fd_rw);
+ close(cap_fd_wo);
+ close(cap_fd_ro);
+ close(i_fd);
+ unlink(TmpFile("cap_inotify"));
+}
+
+TEST(Linux, ArchChange) {
+ const char* prog_candidates[] = {"./mini-me.32", "./mini-me.x32", "./mini-me.64"};
+ const char* progs[] = {NULL, NULL, NULL};
+ char* argv_pass[] = {(char*)"to-come", (char*)"--capmode", NULL};
+ char* null_envp[] = {NULL};
+ int fds[3];
+ int count = 0;
+
+ for (int ii = 0; ii < 3; ii++) {
+ fds[count] = open(prog_candidates[ii], O_RDONLY);
+ if (fds[count] >= 0) {
+ progs[count] = prog_candidates[ii];
+ count++;
+ }
+ }
+ if (count == 0) {
+ TEST_SKIPPED("no different-architecture programs available");
+ return;
+ }
+
+ for (int ii = 0; ii < count; ii++) {
+ // Fork-and-exec a binary of this architecture.
+ pid_t child = fork();
+ if (child == 0) {
+ EXPECT_OK(cap_enter()); // Enter capability mode
+ if (verbose) fprintf(stderr, "[%d] call fexecve(%s, %s)\n",
+ getpid_(), progs[ii], argv_pass[1]);
+ argv_pass[0] = (char *)progs[ii];
+ int rc = fexecve_(fds[ii], argv_pass, null_envp);
+ fprintf(stderr, "fexecve(%s) returned %d errno %d\n", progs[ii], rc, errno);
+ exit(99); // Should not reach here.
+ }
+ int status;
+ EXPECT_EQ(child, waitpid(child, &status, 0));
+ int rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
+ EXPECT_EQ(0, rc);
+ close(fds[ii]);
+ }
+}
+
+FORK_TEST(Linux, Namespace) {
+ REQUIRE_ROOT();
+ pid_t me = getpid_();
+
+ // Create a new UTS namespace.
+ EXPECT_OK(unshare(CLONE_NEWUTS));
+ // Open an FD to its symlink.
+ char buffer[256];
+ sprintf(buffer, "/proc/%d/ns/uts", me);
+ int ns_fd = open(buffer, O_RDONLY);
+
+ cap_rights_t r_rwlstat;
+ cap_rights_init(&r_rwlstat, CAP_READ, CAP_WRITE, CAP_LOOKUP, CAP_FSTAT);
+ cap_rights_t r_rwlstatns;
+ cap_rights_init(&r_rwlstatns, CAP_READ, CAP_WRITE, CAP_LOOKUP, CAP_FSTAT, CAP_SETNS);
+
+ int cap_fd = dup(ns_fd);
+ EXPECT_OK(cap_fd);
+ EXPECT_OK(cap_rights_limit(cap_fd, &r_rwlstat));
+ int cap_fd_setns = dup(ns_fd);
+ EXPECT_OK(cap_fd_setns);
+ EXPECT_OK(cap_rights_limit(cap_fd_setns, &r_rwlstatns));
+ EXPECT_NOTCAPABLE(setns(cap_fd, CLONE_NEWUTS));
+ EXPECT_OK(setns(cap_fd_setns, CLONE_NEWUTS));
+
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+
+ // No setns(2) but unshare(2) is allowed.
+ EXPECT_CAPMODE(setns(ns_fd, CLONE_NEWUTS));
+ EXPECT_OK(unshare(CLONE_NEWUTS));
+}
+
+static void SendFD(int fd, int over) {
+ struct msghdr mh;
+ mh.msg_name = NULL; // No address needed
+ mh.msg_namelen = 0;
+ char buffer1[1024];
+ struct iovec iov[1];
+ iov[0].iov_base = buffer1;
+ iov[0].iov_len = sizeof(buffer1);
+ mh.msg_iov = iov;
+ mh.msg_iovlen = 1;
+ char buffer2[1024];
+ mh.msg_control = buffer2;
+ mh.msg_controllen = CMSG_LEN(sizeof(int));
+ struct cmsghdr *cmptr = CMSG_FIRSTHDR(&mh);
+ cmptr->cmsg_level = SOL_SOCKET;
+ cmptr->cmsg_type = SCM_RIGHTS;
+ cmptr->cmsg_len = CMSG_LEN(sizeof(int));
+ *(int *)CMSG_DATA(cmptr) = fd;
+ buffer1[0] = 0;
+ iov[0].iov_len = 1;
+ int rc = sendmsg(over, &mh, 0);
+ EXPECT_OK(rc);
+}
+
+static int ReceiveFD(int over) {
+ struct msghdr mh;
+ mh.msg_name = NULL; // No address needed
+ mh.msg_namelen = 0;
+ char buffer1[1024];
+ struct iovec iov[1];
+ iov[0].iov_base = buffer1;
+ iov[0].iov_len = sizeof(buffer1);
+ mh.msg_iov = iov;
+ mh.msg_iovlen = 1;
+ char buffer2[1024];
+ mh.msg_control = buffer2;
+ mh.msg_controllen = sizeof(buffer2);
+ int rc = recvmsg(over, &mh, 0);
+ EXPECT_OK(rc);
+ EXPECT_LE(CMSG_LEN(sizeof(int)), mh.msg_controllen);
+ struct cmsghdr *cmptr = CMSG_FIRSTHDR(&mh);
+ int fd = *(int*)CMSG_DATA(cmptr);
+ EXPECT_EQ(CMSG_LEN(sizeof(int)), cmptr->cmsg_len);
+ cmptr = CMSG_NXTHDR(&mh, cmptr);
+ EXPECT_TRUE(cmptr == NULL);
+ return fd;
+}
+
+static int shared_pd = -1;
+static int shared_sock_fds[2];
+
+static int ChildFunc(void *arg) {
+ // This function is running in a new PID namespace, and so is pid 1.
+ if (verbose) fprintf(stderr, " ChildFunc: pid=%d, ppid=%d\n", getpid_(), getppid());
+ EXPECT_EQ(1, getpid_());
+ EXPECT_EQ(0, getppid());
+
+ // The shared process descriptor is outside our namespace, so we cannot
+ // get its pid.
+ if (verbose) fprintf(stderr, " ChildFunc: shared_pd=%d\n", shared_pd);
+ pid_t shared_child = -1;
+ EXPECT_OK(pdgetpid(shared_pd, &shared_child));
+ if (verbose) fprintf(stderr, " ChildFunc: corresponding pid=%d\n", shared_child);
+ EXPECT_EQ(0, shared_child);
+
+ // But we can pdkill() it even so.
+ if (verbose) fprintf(stderr, " ChildFunc: call pdkill(pd=%d)\n", shared_pd);
+ EXPECT_OK(pdkill(shared_pd, SIGINT));
+
+ int pd;
+ pid_t child = pdfork(&pd, 0);
+ EXPECT_OK(child);
+ if (child == 0) {
+ // Child: expect pid 2.
+ if (verbose) fprintf(stderr, " child of ChildFunc: pid=%d, ppid=%d\n", getpid_(), getppid());
+ EXPECT_EQ(2, getpid_());
+ EXPECT_EQ(1, getppid());
+ while (true) {
+ if (verbose) fprintf(stderr, " child of ChildFunc: \"I aten't dead\"\n");
+ sleep(1);
+ }
+ exit(0);
+ }
+ EXPECT_EQ(2, child);
+ EXPECT_PID_ALIVE(child);
+ if (verbose) fprintf(stderr, " ChildFunc: pdfork() -> pd=%d, corresponding pid=%d state='%c'\n",
+ pd, child, ProcessState(child));
+
+ pid_t pid;
+ EXPECT_OK(pdgetpid(pd, &pid));
+ EXPECT_EQ(child, pid);
+
+ sleep(2);
+
+ // Send the process descriptor over UNIX domain socket back to parent.
+ SendFD(pd, shared_sock_fds[1]);
+
+ // Wait for death of (grand)child, killed by our parent.
+ if (verbose) fprintf(stderr, " ChildFunc: wait on pid=%d\n", child);
+ int status;
+ EXPECT_EQ(child, wait4(child, &status, __WALL, NULL));
+
+ if (verbose) fprintf(stderr, " ChildFunc: return 0\n");
+ return 0;
+}
+
+#define STACK_SIZE (1024 * 1024)
+static char child_stack[STACK_SIZE];
+
+// TODO(drysdale): fork into a user namespace first so REQUIRE_ROOT can be removed.
+TEST(Linux, PidNamespacePdFork) {
+ REQUIRE_ROOT();
+ // Pass process descriptors in both directions across a PID namespace boundary.
+ // pdfork() off a child before we start, holding its process descriptor in a global
+ // variable that's accessible to children.
+ pid_t firstborn = pdfork(&shared_pd, 0);
+ EXPECT_OK(firstborn);
+ if (firstborn == 0) {
+ while (true) {
+ if (verbose) fprintf(stderr, " Firstborn: \"I aten't dead\"\n");
+ sleep(1);
+ }
+ exit(0);
+ }
+ EXPECT_PID_ALIVE(firstborn);
+ if (verbose) fprintf(stderr, "Parent: pre-pdfork()ed pd=%d, pid=%d state='%c'\n",
+ shared_pd, firstborn, ProcessState(firstborn));
+ sleep(2);
+
+ // Prepare sockets to communicate with child process.
+ EXPECT_OK(socketpair(AF_UNIX, SOCK_STREAM, 0, shared_sock_fds));
+
+ // Clone into a child process with a new pid namespace.
+ pid_t child = clone(ChildFunc, child_stack + STACK_SIZE,
+ CLONE_FILES|CLONE_NEWPID|SIGCHLD, NULL);
+ EXPECT_OK(child);
+ EXPECT_PID_ALIVE(child);
+ if (verbose) fprintf(stderr, "Parent: child is %d state='%c'\n", child, ProcessState(child));
+
+ // Ensure the child runs. First thing it does is to kill our firstborn, using shared_pd.
+ sleep(1);
+ EXPECT_PID_DEAD(firstborn);
+
+ // But we can still retrieve firstborn's PID, as it's not been reaped yet.
+ pid_t child0;
+ EXPECT_OK(pdgetpid(shared_pd, &child0));
+ EXPECT_EQ(firstborn, child0);
+ if (verbose) fprintf(stderr, "Parent: check on firstborn: pdgetpid(pd=%d) -> child=%d state='%c'\n",
+ shared_pd, child0, ProcessState(child0));
+
+ // Now reap it.
+ int status;
+ EXPECT_EQ(firstborn, waitpid(firstborn, &status, __WALL));
+
+ // Get the process descriptor of the child-of-child via socket transfer.
+ int grandchild_pd = ReceiveFD(shared_sock_fds[0]);
+
+ // Our notion of the pid associated with the grandchild is in the main PID namespace.
+ pid_t grandchild;
+ EXPECT_OK(pdgetpid(grandchild_pd, &grandchild));
+ EXPECT_NE(2, grandchild);
+ if (verbose) fprintf(stderr, "Parent: pre-pdkill: pdgetpid(grandchild_pd=%d) -> grandchild=%d state='%c'\n",
+ grandchild_pd, grandchild, ProcessState(grandchild));
+ EXPECT_PID_ALIVE(grandchild);
+
+ // Kill the grandchild via the process descriptor.
+ EXPECT_OK(pdkill(grandchild_pd, SIGINT));
+ usleep(10000);
+ if (verbose) fprintf(stderr, "Parent: post-pdkill: pdgetpid(grandchild_pd=%d) -> grandchild=%d state='%c'\n",
+ grandchild_pd, grandchild, ProcessState(grandchild));
+ EXPECT_PID_DEAD(grandchild);
+
+ sleep(2);
+
+ // Wait for the child.
+ EXPECT_EQ(child, waitpid(child, &status, WNOHANG));
+ int rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
+ EXPECT_EQ(0, rc);
+
+ close(shared_sock_fds[0]);
+ close(shared_sock_fds[1]);
+ close(shared_pd);
+ close(grandchild_pd);
+}
+
+int NSInit(void *data) {
+ // This function is running in a new PID namespace, and so is pid 1.
+ if (verbose) fprintf(stderr, " NSInit: pid=%d, ppid=%d\n", getpid_(), getppid());
+ EXPECT_EQ(1, getpid_());
+ EXPECT_EQ(0, getppid());
+
+ int pd;
+ pid_t child = pdfork(&pd, 0);
+ EXPECT_OK(child);
+ if (child == 0) {
+ // Child: loop forever until terminated.
+ if (verbose) fprintf(stderr, " child of NSInit: pid=%d, ppid=%d\n", getpid_(), getppid());
+ while (true) {
+ if (verbose) fprintf(stderr, " child of NSInit: \"I aten't dead\"\n");
+ usleep(100000);
+ }
+ exit(0);
+ }
+ EXPECT_EQ(2, child);
+ EXPECT_PID_ALIVE(child);
+ if (verbose) fprintf(stderr, " NSInit: pdfork() -> pd=%d, corresponding pid=%d state='%c'\n",
+ pd, child, ProcessState(child));
+ sleep(1);
+
+ // Send the process descriptor over UNIX domain socket back to parent.
+ SendFD(pd, shared_sock_fds[1]);
+ close(pd);
+
+ // Wait for a byte back in the other direction.
+ int value;
+ if (verbose) fprintf(stderr, " NSInit: block waiting for value\n");
+ read(shared_sock_fds[1], &value, sizeof(value));
+
+ if (verbose) fprintf(stderr, " NSInit: return 0\n");
+ return 0;
+}
+
+TEST(Linux, DeadNSInit) {
+ REQUIRE_ROOT();
+
+ // Prepare sockets to communicate with child process.
+ EXPECT_OK(socketpair(AF_UNIX, SOCK_STREAM, 0, shared_sock_fds));
+
+ // Clone into a child process with a new pid namespace.
+ pid_t child = clone(NSInit, child_stack + STACK_SIZE,
+ CLONE_FILES|CLONE_NEWPID|SIGCHLD, NULL);
+ usleep(10000);
+ EXPECT_OK(child);
+ EXPECT_PID_ALIVE(child);
+ if (verbose) fprintf(stderr, "Parent: child is %d state='%c'\n", child, ProcessState(child));
+
+ // Get the process descriptor of the child-of-child via socket transfer.
+ int grandchild_pd = ReceiveFD(shared_sock_fds[0]);
+ pid_t grandchild;
+ EXPECT_OK(pdgetpid(grandchild_pd, &grandchild));
+ if (verbose) fprintf(stderr, "Parent: grandchild is %d state='%c'\n", grandchild, ProcessState(grandchild));
+
+ // Send an int to the child to trigger its termination. Grandchild should also
+ // go, as its init process is gone.
+ int zero = 0;
+ if (verbose) fprintf(stderr, "Parent: write 0 to pipe\n");
+ write(shared_sock_fds[0], &zero, sizeof(zero));
+ EXPECT_PID_ZOMBIE(child);
+ EXPECT_PID_GONE(grandchild);
+
+ // Wait for the child.
+ int status;
+ EXPECT_EQ(child, waitpid(child, &status, WNOHANG));
+ int rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
+ EXPECT_EQ(0, rc);
+ EXPECT_PID_GONE(child);
+
+ close(shared_sock_fds[0]);
+ close(shared_sock_fds[1]);
+ close(grandchild_pd);
+
+ if (verbose) {
+ fprintf(stderr, "Parent: child %d in state='%c'\n", child, ProcessState(child));
+ fprintf(stderr, "Parent: grandchild %d in state='%c'\n", grandchild, ProcessState(grandchild));
+ }
+}
+
+TEST(Linux, DeadNSInit2) {
+ REQUIRE_ROOT();
+
+ // Prepare sockets to communicate with child process.
+ EXPECT_OK(socketpair(AF_UNIX, SOCK_STREAM, 0, shared_sock_fds));
+
+ // Clone into a child process with a new pid namespace.
+ pid_t child = clone(NSInit, child_stack + STACK_SIZE,
+ CLONE_FILES|CLONE_NEWPID|SIGCHLD, NULL);
+ usleep(10000);
+ EXPECT_OK(child);
+ EXPECT_PID_ALIVE(child);
+ if (verbose) fprintf(stderr, "Parent: child is %d state='%c'\n", child, ProcessState(child));
+
+ // Get the process descriptor of the child-of-child via socket transfer.
+ int grandchild_pd = ReceiveFD(shared_sock_fds[0]);
+ pid_t grandchild;
+ EXPECT_OK(pdgetpid(grandchild_pd, &grandchild));
+ if (verbose) fprintf(stderr, "Parent: grandchild is %d state='%c'\n", grandchild, ProcessState(grandchild));
+
+ // Kill the grandchild
+ EXPECT_OK(pdkill(grandchild_pd, SIGINT));
+ usleep(10000);
+ EXPECT_PID_ZOMBIE(grandchild);
+ // Close the process descriptor, so there are now no procdesc references to grandchild.
+ close(grandchild_pd);
+
+ // Send an int to the child to trigger its termination. Grandchild should also
+ // go, as its init process is gone.
+ int zero = 0;
+ if (verbose) fprintf(stderr, "Parent: write 0 to pipe\n");
+ write(shared_sock_fds[0], &zero, sizeof(zero));
+ EXPECT_PID_ZOMBIE(child);
+ EXPECT_PID_GONE(grandchild);
+
+ // Wait for the child.
+ int status;
+ EXPECT_EQ(child, waitpid(child, &status, WNOHANG));
+ int rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
+ EXPECT_EQ(0, rc);
+
+ close(shared_sock_fds[0]);
+ close(shared_sock_fds[1]);
+
+ if (verbose) {
+ fprintf(stderr, "Parent: child %d in state='%c'\n", child, ProcessState(child));
+ fprintf(stderr, "Parent: grandchild %d in state='%c'\n", grandchild, ProcessState(grandchild));
+ }
+}
+
+#ifdef __x86_64__
+FORK_TEST(Linux, CheckHighWord) {
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+
+ int rc = prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0);
+ EXPECT_OK(rc);
+ EXPECT_EQ(1, rc); // no_new_privs = 1
+
+ // Set some of the high 32-bits of argument zero.
+ uint64_t big_cmd = PR_GET_NO_NEW_PRIVS | 0x100000000LL;
+ EXPECT_CAPMODE(syscall(__NR_prctl, big_cmd, 0, 0, 0, 0));
+}
+#endif
+
+FORK_TEST(Linux, PrctlOpenatBeneath) {
+ // Set no_new_privs = 1
+ EXPECT_OK(prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0));
+ int rc = prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0);
+ EXPECT_OK(rc);
+ EXPECT_EQ(1, rc); // no_new_privs = 1
+
+ // Set openat-beneath mode
+ EXPECT_OK(prctl(PR_SET_OPENAT_BENEATH, 1, 0, 0, 0));
+ rc = prctl(PR_GET_OPENAT_BENEATH, 0, 0, 0, 0);
+ EXPECT_OK(rc);
+ EXPECT_EQ(1, rc); // openat_beneath = 1
+
+ // Clear openat-beneath mode
+ EXPECT_OK(prctl(PR_SET_OPENAT_BENEATH, 0, 0, 0, 0));
+ rc = prctl(PR_GET_OPENAT_BENEATH, 0, 0, 0, 0);
+ EXPECT_OK(rc);
+ EXPECT_EQ(0, rc); // openat_beneath = 0
+
+ EXPECT_OK(cap_enter()); // Enter capability mode
+
+ // Expect to be in openat_beneath mode
+ rc = prctl(PR_GET_OPENAT_BENEATH, 0, 0, 0, 0);
+ EXPECT_OK(rc);
+ EXPECT_EQ(1, rc); // openat_beneath = 1
+
+ // Expect this to be immutable.
+ EXPECT_CAPMODE(prctl(PR_SET_OPENAT_BENEATH, 0, 0, 0, 0));
+ rc = prctl(PR_GET_OPENAT_BENEATH, 0, 0, 0, 0);
+ EXPECT_OK(rc);
+ EXPECT_EQ(1, rc); // openat_beneath = 1
+
+}
+
+FORK_TEST(Linux, NoNewPrivs) {
+ if (getuid() == 0) {
+ // If root, drop CAP_SYS_ADMIN POSIX.1e capability.
+ struct __user_cap_header_struct hdr;
+ hdr.version = _LINUX_CAPABILITY_VERSION_3;
+ hdr.pid = getpid_();
+ struct __user_cap_data_struct data[3];
+ EXPECT_OK(capget(&hdr, &data[0]));
+ data[0].effective &= ~(1 << CAP_SYS_ADMIN);
+ data[0].permitted &= ~(1 << CAP_SYS_ADMIN);
+ data[0].inheritable &= ~(1 << CAP_SYS_ADMIN);
+ EXPECT_OK(capset(&hdr, &data[0]));
+ }
+ int rc = prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0);
+ EXPECT_OK(rc);
+ EXPECT_EQ(0, rc); // no_new_privs == 0
+
+ // Can't enter seccomp-bpf mode with no_new_privs == 0
+ struct sock_filter filter[] = {
+ BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW)
+ };
+ struct sock_fprog bpf;
+ bpf.len = (sizeof(filter) / sizeof(filter[0]));
+ bpf.filter = filter;
+ rc = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &bpf, 0, 0);
+ EXPECT_EQ(-1, rc);
+ EXPECT_EQ(EACCES, errno);
+
+ // Set no_new_privs = 1
+ EXPECT_OK(prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0));
+ rc = prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0);
+ EXPECT_OK(rc);
+ EXPECT_EQ(1, rc); // no_new_privs = 1
+
+ // Can now turn on seccomp mode
+ EXPECT_OK(prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &bpf, 0, 0));
+}
+
+/* Macros for BPF generation */
+#define BPF_RETURN_ERRNO(err) \
+ BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ERRNO | (err & 0xFFFF))
+#define BPF_KILL_PROCESS \
+ BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_KILL)
+#define BPF_ALLOW \
+ BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW)
+#define EXAMINE_SYSCALL \
+ BPF_STMT(BPF_LD+BPF_W+BPF_ABS, offsetof(struct seccomp_data, nr))
+#define ALLOW_SYSCALL(name) \
+ BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, __NR_##name, 0, 1), \
+ BPF_ALLOW
+#define KILL_SYSCALL(name) \
+ BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, __NR_##name, 0, 1), \
+ BPF_KILL_PROCESS
+#define FAIL_SYSCALL(name, err) \
+ BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, __NR_##name, 0, 1), \
+ BPF_RETURN_ERRNO(err)
+
+TEST(Linux, CapModeWithBPF) {
+ pid_t child = fork();
+ EXPECT_OK(child);
+ if (child == 0) {
+ int fd = open(TmpFile("cap_bpf_capmode"), O_CREAT|O_RDWR, 0644);
+ cap_rights_t rights;
+ cap_rights_init(&rights, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_FSYNC);
+ EXPECT_OK(cap_rights_limit(fd, &rights));
+
+ struct sock_filter filter[] = { EXAMINE_SYSCALL,
+ FAIL_SYSCALL(fchmod, ENOMEM),
+ FAIL_SYSCALL(fstat, ENOEXEC),
+ ALLOW_SYSCALL(close),
+ KILL_SYSCALL(fsync),
+ BPF_ALLOW };
+ struct sock_fprog bpf = {.len = (sizeof(filter) / sizeof(filter[0])),
+ .filter = filter};
+ // Set up seccomp-bpf first.
+ EXPECT_OK(prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0));
+ EXPECT_OK(prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &bpf, 0, 0));
+
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+
+ // fchmod is allowed by Capsicum, but failed by BPF.
+ EXPECT_SYSCALL_FAIL(ENOMEM, fchmod(fd, 0644));
+ // open is allowed by BPF, but failed by Capsicum
+ EXPECT_SYSCALL_FAIL(ECAPMODE, open(TmpFile("cap_bpf_capmode"), O_RDONLY));
+ // fstat is failed by both BPF and Capsicum; tie-break is on errno
+ struct stat buf;
+ EXPECT_SYSCALL_FAIL(ENOEXEC, fstat(fd, &buf));
+ // fsync is allowed by Capsicum, but BPF's SIGSYS generation take precedence
+ fsync(fd); // terminate with unhandled SIGSYS
+ exit(0);
+ }
+ int status;
+ EXPECT_EQ(child, waitpid(child, &status, 0));
+ EXPECT_TRUE(WIFSIGNALED(status));
+ EXPECT_EQ(SIGSYS, WTERMSIG(status));
+ unlink(TmpFile("cap_bpf_capmode"));
+}
+
+TEST(Linux, AIO) {
+ int fd = open(TmpFile("cap_aio"), O_CREAT|O_RDWR, 0644);
+ EXPECT_OK(fd);
+
+ cap_rights_t r_rs;
+ cap_rights_init(&r_rs, CAP_READ, CAP_SEEK);
+ cap_rights_t r_ws;
+ cap_rights_init(&r_ws, CAP_WRITE, CAP_SEEK);
+ cap_rights_t r_rwssync;
+ cap_rights_init(&r_rwssync, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_FSYNC);
+
+ int cap_ro = dup(fd);
+ EXPECT_OK(cap_ro);
+ EXPECT_OK(cap_rights_limit(cap_ro, &r_rs));
+ EXPECT_OK(cap_ro);
+ int cap_wo = dup(fd);
+ EXPECT_OK(cap_wo);
+ EXPECT_OK(cap_rights_limit(cap_wo, &r_ws));
+ EXPECT_OK(cap_wo);
+ int cap_all = dup(fd);
+ EXPECT_OK(cap_all);
+ EXPECT_OK(cap_rights_limit(cap_all, &r_rwssync));
+ EXPECT_OK(cap_all);
+
+ // Linux: io_setup, io_submit, io_getevents, io_cancel, io_destroy
+ aio_context_t ctx = 0;
+ EXPECT_OK(syscall(__NR_io_setup, 10, &ctx));
+
+ unsigned char buffer[32] = {1, 2, 3, 4};
+ struct iocb req;
+ memset(&req, 0, sizeof(req));
+ req.aio_reqprio = 0;
+ req.aio_fildes = fd;
+ uintptr_t bufaddr = (uintptr_t)buffer;
+ req.aio_buf = (__u64)bufaddr;
+ req.aio_nbytes = 4;
+ req.aio_offset = 0;
+ struct iocb* reqs[1] = {&req};
+
+ // Write operation
+ req.aio_lio_opcode = IOCB_CMD_PWRITE;
+ req.aio_fildes = cap_ro;
+ EXPECT_NOTCAPABLE(syscall(__NR_io_submit, ctx, 1, reqs));
+ req.aio_fildes = cap_wo;
+ EXPECT_OK(syscall(__NR_io_submit, ctx, 1, reqs));
+
+ // Sync operation
+ req.aio_lio_opcode = IOCB_CMD_FSYNC;
+ EXPECT_NOTCAPABLE(syscall(__NR_io_submit, ctx, 1, reqs));
+ req.aio_lio_opcode = IOCB_CMD_FDSYNC;
+ EXPECT_NOTCAPABLE(syscall(__NR_io_submit, ctx, 1, reqs));
+ // Even with CAP_FSYNC, turns out fsync/fdsync aren't implemented
+ req.aio_fildes = cap_all;
+ EXPECT_FAIL_NOT_NOTCAPABLE(syscall(__NR_io_submit, ctx, 1, reqs));
+ req.aio_lio_opcode = IOCB_CMD_FSYNC;
+ EXPECT_FAIL_NOT_NOTCAPABLE(syscall(__NR_io_submit, ctx, 1, reqs));
+
+ // Read operation
+ req.aio_lio_opcode = IOCB_CMD_PREAD;
+ req.aio_fildes = cap_wo;
+ EXPECT_NOTCAPABLE(syscall(__NR_io_submit, ctx, 1, reqs));
+ req.aio_fildes = cap_ro;
+ EXPECT_OK(syscall(__NR_io_submit, ctx, 1, reqs));
+
+ EXPECT_OK(syscall(__NR_io_destroy, ctx));
+
+ close(cap_all);
+ close(cap_wo);
+ close(cap_ro);
+ close(fd);
+ unlink(TmpFile("cap_aio"));
+}
+
+#ifndef KCMP_FILE
+#define KCMP_FILE 0
+#endif
+TEST(Linux, Kcmp) {
+ // This requires CONFIG_CHECKPOINT_RESTORE in kernel config.
+ int fd = open("/etc/passwd", O_RDONLY);
+ EXPECT_OK(fd);
+ pid_t parent = getpid_();
+
+ errno = 0;
+ int rc = syscall(__NR_kcmp, parent, parent, KCMP_FILE, fd, fd);
+ if (rc == -1 && errno == ENOSYS) {
+ TEST_SKIPPED("kcmp(2) gives -ENOSYS");
+ return;
+ }
+
+ pid_t child = fork();
+ if (child == 0) {
+ // Child: limit rights on FD.
+ child = getpid_();
+ EXPECT_OK(syscall(__NR_kcmp, parent, child, KCMP_FILE, fd, fd));
+ cap_rights_t rights;
+ cap_rights_init(&rights, CAP_READ, CAP_WRITE);
+ EXPECT_OK(cap_rights_limit(fd, &rights));
+ // A capability wrapping a normal FD is different (from a kcmp(2) perspective)
+ // than the original file.
+ EXPECT_NE(0, syscall(__NR_kcmp, parent, child, KCMP_FILE, fd, fd));
+ exit(HasFailure());
+ }
+ // Wait for the child.
+ int status;
+ EXPECT_EQ(child, waitpid(child, &status, 0));
+ rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
+ EXPECT_EQ(0, rc);
+
+ close(fd);
+}
+
+TEST(Linux, ProcFS) {
+ cap_rights_t rights;
+ cap_rights_init(&rights, CAP_READ, CAP_SEEK);
+ int fd = open("/etc/passwd", O_RDONLY);
+ EXPECT_OK(fd);
+ lseek(fd, 4, SEEK_SET);
+ int cap = dup(fd);
+ EXPECT_OK(cap);
+ EXPECT_OK(cap_rights_limit(cap, &rights));
+ pid_t me = getpid_();
+
+ char buffer[1024];
+ sprintf(buffer, "/proc/%d/fdinfo/%d", me, cap);
+ int procfd = open(buffer, O_RDONLY);
+ EXPECT_OK(procfd) << " failed to open " << buffer;
+ if (procfd < 0) return;
+ int proccap = dup(procfd);
+ EXPECT_OK(proccap);
+ EXPECT_OK(cap_rights_limit(proccap, &rights));
+
+ EXPECT_OK(read(proccap, buffer, sizeof(buffer)));
+ // The fdinfo should include the file pos of the underlying file
+ EXPECT_NE((char*)NULL, strstr(buffer, "pos:\t4"));
+ // ...and the rights of the Capsicum capability.
+ EXPECT_NE((char*)NULL, strstr(buffer, "rights:\t0x"));
+
+ close(procfd);
+ close(proccap);
+ close(cap);
+ close(fd);
+}
+
+FORK_TEST(Linux, ProcessClocks) {
+ pid_t self = getpid_();
+ pid_t child = fork();
+ EXPECT_OK(child);
+ if (child == 0) {
+ child = getpid_();
+ usleep(100000);
+ exit(0);
+ }
+
+ EXPECT_OK(cap_enter()); // Enter capability mode.
+
+ // Nefariously build a clock ID for the child's CPU time.
+ // This relies on knowledge of the internal layout of clock IDs.
+ clockid_t child_clock;
+ child_clock = ((~child) << 3) | 0x0;
+ struct timespec ts;
+ memset(&ts, 0, sizeof(ts));
+
+ // TODO(drysdale): Should not be possible to retrieve info about a
+ // different process, as the PID global namespace should be locked
+ // down.
+ EXPECT_OK(clock_gettime(child_clock, &ts));
+ if (verbose) fprintf(stderr, "[parent: %d] clock_gettime(child=%d->0x%08x) is %ld.%09ld \n",
+ self, child, child_clock, (long)ts.tv_sec, (long)ts.tv_nsec);
+
+ child_clock = ((~1) << 3) | 0x0;
+ memset(&ts, 0, sizeof(ts));
+ EXPECT_OK(clock_gettime(child_clock, &ts));
+ if (verbose) fprintf(stderr, "[parent: %d] clock_gettime(init=1->0x%08x) is %ld.%09ld \n",
+ self, child_clock, (long)ts.tv_sec, (long)ts.tv_nsec);
+
+ // Orphan the child.
+}
+
+TEST(Linux, SetLease) {
+ int fd_all = open(TmpFile("cap_lease"), O_CREAT|O_RDWR, 0644);
+ EXPECT_OK(fd_all);
+ int fd_rw = dup(fd_all);
+ EXPECT_OK(fd_rw);
+
+ cap_rights_t r_all;
+ cap_rights_init(&r_all, CAP_READ, CAP_WRITE, CAP_FLOCK, CAP_FSIGNAL);
+ EXPECT_OK(cap_rights_limit(fd_all, &r_all));
+
+ cap_rights_t r_rw;
+ cap_rights_init(&r_rw, CAP_READ, CAP_WRITE);
+ EXPECT_OK(cap_rights_limit(fd_rw, &r_rw));
+
+ EXPECT_NOTCAPABLE(fcntl(fd_rw, F_SETLEASE, F_WRLCK));
+ EXPECT_NOTCAPABLE(fcntl(fd_rw, F_GETLEASE));
+
+ if (!tmpdir_on_tmpfs) { // tmpfs doesn't support leases
+ EXPECT_OK(fcntl(fd_all, F_SETLEASE, F_WRLCK));
+ EXPECT_EQ(F_WRLCK, fcntl(fd_all, F_GETLEASE));
+
+ EXPECT_OK(fcntl(fd_all, F_SETLEASE, F_UNLCK, 0));
+ EXPECT_EQ(F_UNLCK, fcntl(fd_all, F_GETLEASE));
+ }
+ close(fd_all);
+ close(fd_rw);
+ unlink(TmpFile("cap_lease"));
+}
+
+TEST(Linux, InvalidRightsSyscall) {
+ int fd = open(TmpFile("cap_invalid_rights"), O_RDONLY|O_CREAT, 0644);
+ EXPECT_OK(fd);
+
+ cap_rights_t rights;
+ cap_rights_init(&rights, CAP_READ, CAP_WRITE, CAP_FCHMOD, CAP_FSTAT);
+
+ // Use the raw syscall throughout.
+ EXPECT_EQ(0, syscall(__NR_cap_rights_limit, fd, &rights, 0, 0, NULL, 0));
+
+ // Directly access the syscall, and find all unseemly manner of use for it.
+ // - Invalid flags
+ EXPECT_EQ(-1, syscall(__NR_cap_rights_limit, fd, &rights, 0, 0, NULL, 1));
+ EXPECT_EQ(EINVAL, errno);
+ // - Specify an fcntl subright, but no CAP_FCNTL set
+ EXPECT_EQ(-1, syscall(__NR_cap_rights_limit, fd, &rights, CAP_FCNTL_GETFL, 0, NULL, 0));
+ EXPECT_EQ(EINVAL, errno);
+ // - Specify an ioctl subright, but no CAP_IOCTL set
+ unsigned int ioctl1 = 1;
+ EXPECT_EQ(-1, syscall(__NR_cap_rights_limit, fd, &rights, 0, 1, &ioctl1, 0));
+ EXPECT_EQ(EINVAL, errno);
+ // - N ioctls, but null pointer passed
+ EXPECT_EQ(-1, syscall(__NR_cap_rights_limit, fd, &rights, 0, 1, NULL, 0));
+ EXPECT_EQ(EINVAL, errno);
+ // - Invalid nioctls
+ EXPECT_EQ(-1, syscall(__NR_cap_rights_limit, fd, &rights, 0, -2, NULL, 0));
+ EXPECT_EQ(EINVAL, errno);
+ // - Null primary rights
+ EXPECT_EQ(-1, syscall(__NR_cap_rights_limit, fd, NULL, 0, 0, NULL, 0));
+ EXPECT_EQ(EFAULT, errno);
+ // - Invalid index bitmask
+ rights.cr_rights[0] |= 3ULL << 57;
+ EXPECT_EQ(-1, syscall(__NR_cap_rights_limit, fd, &rights, 0, 0, NULL, 0));
+ EXPECT_EQ(EINVAL, errno);
+ // - Invalid version
+ rights.cr_rights[0] |= 2ULL << 62;
+ EXPECT_EQ(-1, syscall(__NR_cap_rights_limit, fd, &rights, 0, 0, NULL, 0));
+ EXPECT_EQ(EINVAL, errno);
+
+ close(fd);
+ unlink(TmpFile("cap_invalid_rights"));
+}
+
+FORK_TEST_ON(Linux, OpenByHandleAt, TmpFile("cap_openbyhandle_testfile")) {
+ REQUIRE_ROOT();
+ int dir = open(tmpdir.c_str(), O_RDONLY);
+ EXPECT_OK(dir);
+ int fd = openat(dir, "cap_openbyhandle_testfile", O_RDWR|O_CREAT, 0644);
+ EXPECT_OK(fd);
+ const char* message = "Saved text";
+ EXPECT_OK(write(fd, message, strlen(message)));
+ close(fd);
+
+ struct file_handle* fhandle = (struct file_handle*)malloc(sizeof(struct file_handle) + MAX_HANDLE_SZ);
+ fhandle->handle_bytes = MAX_HANDLE_SZ;
+ int mount_id;
+ EXPECT_OK(name_to_handle_at(dir, "cap_openbyhandle_testfile", fhandle, &mount_id, 0));
+
+ fd = open_by_handle_at(dir, fhandle, O_RDONLY);
+ EXPECT_OK(fd);
+ char buffer[200];
+ EXPECT_OK(read(fd, buffer, 199));
+ EXPECT_EQ(std::string(message), std::string(buffer));
+ close(fd);
+
+ // Cannot issue open_by_handle_at after entering capability mode.
+ cap_enter();
+ EXPECT_CAPMODE(open_by_handle_at(dir, fhandle, O_RDONLY));
+
+ close(dir);
+}
+
+int getrandom_(void *buf, size_t buflen, unsigned int flags) {
+#ifdef __NR_getrandom
+ return syscall(__NR_getrandom, buf, buflen, flags);
+#else
+ errno = ENOSYS;
+ return -1;
+#endif
+}
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 17, 0)
+#include <linux/random.h> // Requires 3.17 kernel
+FORK_TEST(Linux, GetRandom) {
+ EXPECT_OK(cap_enter());
+ unsigned char buffer[1024];
+ unsigned char buffer2[1024];
+ EXPECT_OK(getrandom_(buffer, sizeof(buffer), GRND_NONBLOCK));
+ EXPECT_OK(getrandom_(buffer2, sizeof(buffer2), GRND_NONBLOCK));
+ EXPECT_NE(0, memcmp(buffer, buffer2, sizeof(buffer)));
+}
+#endif
+
+int memfd_create_(const char *name, unsigned int flags) {
+#ifdef __NR_memfd_create
+ return syscall(__NR_memfd_create, name, flags);
+#else
+ errno = ENOSYS;
+ return -1;
+#endif
+}
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 17, 0)
+#include <linux/memfd.h> // Requires 3.17 kernel
+TEST(Linux, MemFDDeathTest) {
+ int memfd = memfd_create_("capsicum-test", MFD_ALLOW_SEALING);
+ if (memfd == -1 && errno == ENOSYS) {
+ TEST_SKIPPED("memfd_create(2) gives -ENOSYS");
+ return;
+ }
+ const int LEN = 16;
+ EXPECT_OK(ftruncate(memfd, LEN));
+ int memfd_ro = dup(memfd);
+ int memfd_rw = dup(memfd);
+ EXPECT_OK(memfd_ro);
+ EXPECT_OK(memfd_rw);
+ cap_rights_t rights;
+ EXPECT_OK(cap_rights_limit(memfd_ro, cap_rights_init(&rights, CAP_MMAP_R, CAP_FSTAT)));
+ EXPECT_OK(cap_rights_limit(memfd_rw, cap_rights_init(&rights, CAP_MMAP_RW, CAP_FCHMOD)));
+
+ unsigned char *p_ro = (unsigned char *)mmap(NULL, LEN, PROT_READ, MAP_SHARED, memfd_ro, 0);
+ EXPECT_NE((unsigned char *)MAP_FAILED, p_ro);
+ unsigned char *p_rw = (unsigned char *)mmap(NULL, LEN, PROT_READ|PROT_WRITE, MAP_SHARED, memfd_rw, 0);
+ EXPECT_NE((unsigned char *)MAP_FAILED, p_rw);
+ EXPECT_EQ(MAP_FAILED,
+ mmap(NULL, LEN, PROT_READ|PROT_WRITE, MAP_SHARED, memfd_ro, 0));
+
+ *p_rw = 42;
+ EXPECT_EQ(42, *p_ro);
+ EXPECT_DEATH(*p_ro = 42, "");
+
+#ifndef F_ADD_SEALS
+ // Hack for when libc6 does not yet include the updated linux/fcntl.h from kernel 3.17
+#define _F_LINUX_SPECIFIC_BASE F_SETLEASE
+#define F_ADD_SEALS (_F_LINUX_SPECIFIC_BASE + 9)
+#define F_GET_SEALS (_F_LINUX_SPECIFIC_BASE + 10)
+#define F_SEAL_SEAL 0x0001 /* prevent further seals from being set */
+#define F_SEAL_SHRINK 0x0002 /* prevent file from shrinking */
+#define F_SEAL_GROW 0x0004 /* prevent file from growing */
+#define F_SEAL_WRITE 0x0008 /* prevent writes */
+#endif
+
+ // Reading the seal information requires CAP_FSTAT.
+ int seals = fcntl(memfd, F_GET_SEALS);
+ EXPECT_OK(seals);
+ if (verbose) fprintf(stderr, "seals are %08x on base fd\n", seals);
+ int seals_ro = fcntl(memfd_ro, F_GET_SEALS);
+ EXPECT_EQ(seals, seals_ro);
+ if (verbose) fprintf(stderr, "seals are %08x on read-only fd\n", seals_ro);
+ int seals_rw = fcntl(memfd_rw, F_GET_SEALS);
+ EXPECT_NOTCAPABLE(seals_rw);
+
+ // Fail to seal as a writable mapping exists.
+ EXPECT_EQ(-1, fcntl(memfd_rw, F_ADD_SEALS, F_SEAL_WRITE));
+ EXPECT_EQ(EBUSY, errno);
+ *p_rw = 42;
+
+ // Seal the rw version; need to unmap first.
+ munmap(p_rw, LEN);
+ munmap(p_ro, LEN);
+ EXPECT_OK(fcntl(memfd_rw, F_ADD_SEALS, F_SEAL_WRITE));
+
+ seals = fcntl(memfd, F_GET_SEALS);
+ EXPECT_OK(seals);
+ if (verbose) fprintf(stderr, "seals are %08x on base fd\n", seals);
+ seals_ro = fcntl(memfd_ro, F_GET_SEALS);
+ EXPECT_EQ(seals, seals_ro);
+ if (verbose) fprintf(stderr, "seals are %08x on read-only fd\n", seals_ro);
+
+ // Remove the CAP_FCHMOD right, can no longer add seals.
+ EXPECT_OK(cap_rights_limit(memfd_rw, cap_rights_init(&rights, CAP_MMAP_RW)));
+ EXPECT_NOTCAPABLE(fcntl(memfd_rw, F_ADD_SEALS, F_SEAL_WRITE));
+
+ close(memfd);
+ close(memfd_ro);
+ close(memfd_rw);
+}
+#endif
+
+#else
+void noop() {}
+#endif
Index: contrib/capsicum-test/makefile
===================================================================
--- /dev/null
+++ contrib/capsicum-test/makefile
@@ -0,0 +1,36 @@
+all: capsicum-test smoketest mini-me mini-me.noexec mini-me.setuid $(EXTRA_PROGS)
+OBJECTS=capsicum-test-main.o capsicum-test.o capability-fd.o fexecve.o procdesc.o capmode.o fcntl.o ioctl.o openat.o sysctl.o select.o mqueue.o socket.o sctp.o capability-fd-pair.o linux.o overhead.o rename.o
+
+GTEST_DIR=gtest-1.8.1
+GTEST_INCS=-I$(GTEST_DIR)/include -I$(GTEST_DIR)
+GTEST_FLAGS=-DGTEST_USE_OWN_TR1_TUPLE=1 -DGTEST_HAS_TR1_TUPLE=1
+CXXFLAGS+=$(ARCHFLAG) -Wall -g $(GTEST_INCS) $(GTEST_FLAGS) --std=c++11
+CFLAGS+=$(ARCHFLAG) -Wall -g
+
+capsicum-test: $(OBJECTS) libgtest.a $(LOCAL_LIBS)
+ $(CXX) $(CXXFLAGS) -g -o $@ $(OBJECTS) libgtest.a -lpthread -lrt $(LIBSCTP) $(LIBCAPRIGHTS)
+
+# Small statically-linked program for fexecve tests
+# (needs to be statically linked so that execve()ing it
+# doesn't involve ld.so traversing the filesystem).
+mini-me: mini-me.c
+ $(CC) $(CFLAGS) -static -o $@ $<
+mini-me.noexec: mini-me
+ cp mini-me $@ && chmod -x $@
+mini-me.setuid: mini-me
+ rm -f $@ && cp mini-me $@&& sudo chown root $@ && sudo chmod u+s $@
+
+# Simple C test of Capsicum syscalls
+SMOKETEST_OBJECTS=smoketest.o
+smoketest: $(SMOKETEST_OBJECTS) $(LOCAL_LIBS)
+ $(CC) $(CFLAGS) -o $@ $(SMOKETEST_OBJECTS) $(LIBCAPRIGHTS)
+
+test: capsicum-test mini-me mini-me.noexec mini-me.setuid $(EXTRA_PROGS)
+ ./capsicum-test
+gtest-all.o:
+ $(CXX) $(ARCHFLAG) -I$(GTEST_DIR)/include -I$(GTEST_DIR) $(GTEST_FLAGS) -c ${GTEST_DIR}/src/gtest-all.cc
+libgtest.a: gtest-all.o
+ $(AR) -rv libgtest.a gtest-all.o
+
+clean:
+ rm -rf gtest-all.o libgtest.a capsicum-test mini-me mini-me.noexec smoketest $(SMOKETEST_OBJECTS) $(OBJECTS) $(LOCAL_CLEAN) $(EXTRA_PROGS)
Index: contrib/capsicum-test/mini-me.c
===================================================================
--- /dev/null
+++ contrib/capsicum-test/mini-me.c
@@ -0,0 +1,38 @@
+#include <sys/types.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+int main(int argc, char* argv[]) {
+ if (argc == 2 && !strcmp(argv[1], "--pass")) {
+ fprintf(stderr,"[%d] %s immediately returning 0\n", getpid(), argv[0]);
+ return 0;
+ }
+
+ if (argc == 2 && !strcmp(argv[1], "--fail")) {
+ fprintf(stderr,"[%d] %s immediately returning 1\n", getpid(), argv[0]);
+ return 1;
+ }
+
+ if (argc == 2 && !strcmp(argv[1], "--checkroot")) {
+ int rc = (geteuid() == 0);
+ fprintf(stderr,"[uid:%d] %s immediately returning (geteuid() == 0) = %d\n", geteuid(), argv[0], rc);
+ return rc;
+ }
+
+ if (argc == 2 && !strcmp(argv[1], "--capmode")) {
+ /* Expect to already be in capability mode: check we can't open a file */
+ int rc = 0;
+
+ int fd = open("/etc/passwd", O_RDONLY);
+ if (fd > 0) {
+ fprintf(stderr,"[%d] %s unexpectedly able to open file\n", getpid(), argv[0]);
+ rc = 1;
+ }
+ fprintf(stderr,"[%d] %s --capmode returning %d\n", getpid(), argv[0], rc);
+ return rc;
+ }
+
+ return -1;
+}
Index: contrib/capsicum-test/mqueue.cc
===================================================================
--- /dev/null
+++ contrib/capsicum-test/mqueue.cc
@@ -0,0 +1,100 @@
+// Tests for POSIX message queue functionality.
+
+#include <time.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <mqueue.h>
+
+#include <string>
+
+#include "capsicum.h"
+#include "syscalls.h"
+#include "capsicum-test.h"
+
+// Run a test case in a forked process, possibly cleaning up a
+// message after completion
+#define FORK_TEST_ON_MQ(test_case_name, test_name, test_mq) \
+ static void test_case_name##_##test_name##_ForkTest(); \
+ TEST(test_case_name, test_name ## Forked) { \
+ _RUN_FORKED_FN(test_case_name##_##test_name##_ForkTest, \
+ #test_case_name, #test_name); \
+ const char *mqname = test_mq; \
+ if (mqname) mq_unlink_(mqname); \
+ } \
+ static void test_case_name##_##test_name##_ForkTest()
+
+static bool invoked;
+void seen_it_done_it(int) {
+ invoked = true;
+}
+
+FORK_TEST_ON_MQ(PosixMqueue, CapMode, "/cap_mq") {
+ int mq = mq_open_("/cap_mq", O_RDWR|O_CREAT, 0644, NULL);
+ // On FreeBSD, turn on message queue support with:
+ // - 'kldload mqueuefs'
+ // - 'options P1003_1B_MQUEUE' in kernel build config.
+ if (mq < 0 && errno == ENOSYS) {
+ TEST_SKIPPED("mq_open -> -ENOSYS");
+ return;
+ }
+ EXPECT_OK(mq);
+ cap_rights_t r_read;
+ cap_rights_init(&r_read, CAP_READ);
+ cap_rights_t r_write;
+ cap_rights_init(&r_write, CAP_WRITE);
+ cap_rights_t r_poll;
+ cap_rights_init(&r_poll, CAP_EVENT);
+
+ int cap_read_mq = dup(mq);
+ EXPECT_OK(cap_read_mq);
+ EXPECT_OK(cap_rights_limit(cap_read_mq, &r_read));
+ int cap_write_mq = dup(mq);
+ EXPECT_OK(cap_write_mq);
+ EXPECT_OK(cap_rights_limit(cap_write_mq, &r_write));
+ int cap_poll_mq = dup(mq);
+ EXPECT_OK(cap_poll_mq);
+ EXPECT_OK(cap_rights_limit(cap_poll_mq, &r_poll));
+ EXPECT_OK(mq_close_(mq));
+
+ signal(SIGUSR2, seen_it_done_it);
+
+ EXPECT_OK(cap_enter()); // Enter capability mode
+
+ // Can no longer access the message queue via the POSIX IPC namespace.
+ EXPECT_CAPMODE(mq_open_("/cap_mw", O_RDWR|O_CREAT, 0644, NULL));
+
+ struct sigevent se;
+ se.sigev_notify = SIGEV_SIGNAL;
+ se.sigev_signo = SIGUSR2;
+ EXPECT_OK(mq_notify_(cap_poll_mq, &se));
+ EXPECT_NOTCAPABLE(mq_notify_(cap_read_mq, &se));
+ EXPECT_NOTCAPABLE(mq_notify_(cap_write_mq, &se));
+
+ const unsigned int kPriority = 10;
+ const char* message = "xyzzy";
+ struct timespec ts;
+ ts.tv_sec = 1;
+ ts.tv_nsec = 0;
+ EXPECT_OK(mq_timedsend_(cap_write_mq, message, strlen(message) + 1, kPriority, &ts));
+ EXPECT_NOTCAPABLE(mq_timedsend_(cap_read_mq, message, strlen(message) + 1, kPriority, &ts));
+
+ sleep(1); // Give the notification a chance to arrive.
+ EXPECT_TRUE(invoked);
+
+ struct mq_attr mqa;
+ EXPECT_OK(mq_getattr_(cap_poll_mq, &mqa));
+ EXPECT_OK(mq_setattr_(cap_poll_mq, &mqa, NULL));
+ EXPECT_NOTCAPABLE(mq_getattr_(cap_write_mq, &mqa));
+
+ char* buffer = (char *)malloc(mqa.mq_msgsize);
+ unsigned int priority;
+ EXPECT_NOTCAPABLE(mq_timedreceive_(cap_write_mq, buffer, mqa.mq_msgsize, &priority, &ts));
+ EXPECT_OK(mq_timedreceive_(cap_read_mq, buffer, mqa.mq_msgsize, &priority, &ts));
+ EXPECT_EQ(std::string(message), std::string(buffer));
+ EXPECT_EQ(kPriority, priority);
+ free(buffer);
+
+ close(cap_read_mq);
+ close(cap_write_mq);
+ close(cap_poll_mq);
+}
Index: contrib/capsicum-test/openat.cc
===================================================================
--- /dev/null
+++ contrib/capsicum-test/openat.cc
@@ -0,0 +1,361 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+#include <string>
+
+#include "capsicum.h"
+#include "capsicum-test.h"
+#include "syscalls.h"
+
+// Check an open call works and close the resulting fd.
+#define EXPECT_OPEN_OK(f) do { \
+ int _fd = f; \
+ EXPECT_OK(_fd); \
+ close(_fd); \
+ } while (0)
+
+static void CreateFile(const char *filename, const char *contents) {
+ int fd = open(filename, O_CREAT|O_RDWR, 0644);
+ EXPECT_OK(fd);
+ EXPECT_OK(write(fd, contents, strlen(contents)));
+ close(fd);
+}
+
+// Test openat(2) in a variety of sitations to ensure that it obeys Capsicum
+// "strict relative" rules:
+//
+// 1. Use strict relative lookups in capability mode or when operating
+// relative to a capability.
+// 2. When performing strict relative lookups, absolute paths (including
+// symlinks to absolute paths) are not allowed, nor are paths containing
+// '..' components.
+//
+// These rules apply when:
+// - the directory FD is a Capsicum capability
+// - the process is in capability mode
+// - the openat(2) operation includes the O_BENEATH flag.
+FORK_TEST(Openat, Relative) {
+ int etc = open("/etc/", O_RDONLY);
+ EXPECT_OK(etc);
+
+ cap_rights_t r_base;
+ cap_rights_init(&r_base, CAP_READ, CAP_WRITE, CAP_SEEK, CAP_LOOKUP, CAP_FCNTL, CAP_IOCTL);
+ cap_rights_t r_ro;
+ cap_rights_init(&r_ro, CAP_READ);
+ cap_rights_t r_rl;
+ cap_rights_init(&r_rl, CAP_READ, CAP_LOOKUP);
+
+ int etc_cap = dup(etc);
+ EXPECT_OK(etc_cap);
+ EXPECT_OK(cap_rights_limit(etc_cap, &r_ro));
+ int etc_cap_ro = dup(etc);
+ EXPECT_OK(etc_cap_ro);
+ EXPECT_OK(cap_rights_limit(etc_cap_ro, &r_rl));
+ int etc_cap_base = dup(etc);
+ EXPECT_OK(etc_cap_base);
+ EXPECT_OK(cap_rights_limit(etc_cap_base, &r_base));
+#ifdef HAVE_CAP_FCNTLS_LIMIT
+ // Also limit fcntl(2) subrights.
+ EXPECT_OK(cap_fcntls_limit(etc_cap_base, CAP_FCNTL_GETFL));
+#endif
+#ifdef HAVE_CAP_IOCTLS_LIMIT
+ // Also limit ioctl(2) subrights.
+ cap_ioctl_t ioctl_nread = FIONREAD;
+ EXPECT_OK(cap_ioctls_limit(etc_cap_base, &ioctl_nread, 1));
+#endif
+
+ // openat(2) with regular file descriptors in non-capability mode
+ // Should Just Work (tm).
+ EXPECT_OPEN_OK(openat(etc, "/etc/passwd", O_RDONLY));
+ EXPECT_OPEN_OK(openat(AT_FDCWD, "/etc/passwd", O_RDONLY));
+ EXPECT_OPEN_OK(openat(etc, "passwd", O_RDONLY));
+ EXPECT_OPEN_OK(openat(etc, "../etc/passwd", O_RDONLY));
+
+ // Lookups relative to capabilities should be strictly relative.
+ // When not in capability mode, we don't actually require CAP_LOOKUP.
+ EXPECT_OPEN_OK(openat(etc_cap_ro, "passwd", O_RDONLY));
+ EXPECT_OPEN_OK(openat(etc_cap_base, "passwd", O_RDONLY));
+
+ // Performing openat(2) on a path with leading slash ignores
+ // the provided directory FD.
+ EXPECT_OPEN_OK(openat(etc_cap_ro, "/etc/passwd", O_RDONLY));
+ EXPECT_OPEN_OK(openat(etc_cap_base, "/etc/passwd", O_RDONLY));
+ // Relative lookups that go upward are not allowed.
+ EXPECT_OPENAT_FAIL_TRAVERSAL(etc_cap_ro, "../etc/passwd", O_RDONLY);
+ EXPECT_OPENAT_FAIL_TRAVERSAL(etc_cap_base, "../etc/passwd", O_RDONLY);
+
+ // A file opened relative to a capability should itself be a capability.
+ int fd = openat(etc_cap_base, "passwd", O_RDONLY);
+ EXPECT_OK(fd);
+ cap_rights_t rights;
+ EXPECT_OK(cap_rights_get(fd, &rights));
+ EXPECT_RIGHTS_IN(&rights, &r_base);
+#ifdef HAVE_CAP_FCNTLS_LIMIT
+ cap_fcntl_t fcntls;
+ EXPECT_OK(cap_fcntls_get(fd, &fcntls));
+ EXPECT_EQ((cap_fcntl_t)CAP_FCNTL_GETFL, fcntls);
+#endif
+#ifdef HAVE_CAP_IOCTLS_LIMIT
+ cap_ioctl_t ioctls[16];
+ ssize_t nioctls;
+ memset(ioctls, 0, sizeof(ioctls));
+ nioctls = cap_ioctls_get(fd, ioctls, 16);
+ EXPECT_OK(nioctls);
+ EXPECT_EQ(1, nioctls);
+ EXPECT_EQ((cap_ioctl_t)FIONREAD, ioctls[0]);
+#endif
+ close(fd);
+
+ // Enter capability mode; now ALL lookups are strictly relative.
+ EXPECT_OK(cap_enter());
+
+ // Relative lookups on regular files or capabilities with CAP_LOOKUP
+ // ought to succeed.
+ EXPECT_OPEN_OK(openat(etc, "passwd", O_RDONLY));
+ EXPECT_OPEN_OK(openat(etc_cap_ro, "passwd", O_RDONLY));
+ EXPECT_OPEN_OK(openat(etc_cap_base, "passwd", O_RDONLY));
+
+ // Lookup relative to capabilities without CAP_LOOKUP should fail.
+ EXPECT_NOTCAPABLE(openat(etc_cap, "passwd", O_RDONLY));
+
+ // Absolute lookups should fail.
+ EXPECT_CAPMODE(openat(AT_FDCWD, "/etc/passwd", O_RDONLY));
+ EXPECT_OPENAT_FAIL_TRAVERSAL(etc, "/etc/passwd", O_RDONLY);
+ EXPECT_OPENAT_FAIL_TRAVERSAL(etc_cap_ro, "/etc/passwd", O_RDONLY);
+
+ // Lookups containing '..' should fail in capability mode.
+ EXPECT_OPENAT_FAIL_TRAVERSAL(etc, "../etc/passwd", O_RDONLY);
+ EXPECT_OPENAT_FAIL_TRAVERSAL(etc_cap_ro, "../etc/passwd", O_RDONLY);
+ EXPECT_OPENAT_FAIL_TRAVERSAL(etc_cap_base, "../etc/passwd", O_RDONLY);
+
+ fd = openat(etc, "passwd", O_RDONLY);
+ EXPECT_OK(fd);
+
+ // A file opened relative to a capability should itself be a capability.
+ fd = openat(etc_cap_base, "passwd", O_RDONLY);
+ EXPECT_OK(fd);
+ EXPECT_OK(cap_rights_get(fd, &rights));
+ EXPECT_RIGHTS_IN(&rights, &r_base);
+ close(fd);
+
+ fd = openat(etc_cap_ro, "passwd", O_RDONLY);
+ EXPECT_OK(fd);
+ EXPECT_OK(cap_rights_get(fd, &rights));
+ EXPECT_RIGHTS_IN(&rights, &r_rl);
+ close(fd);
+}
+
+#define TOPDIR "cap_topdir"
+#define SUBDIR TOPDIR "/subdir"
+class OpenatTest : public ::testing::Test {
+ public:
+ // Build a collection of files, subdirs and symlinks:
+ // /tmp/cap_topdir/
+ // /topfile
+ // /subdir/
+ // /subdir/bottomfile
+ // /symlink.samedir -> topfile
+ // /dsymlink.samedir -> ./
+ // /symlink.down -> subdir/bottomfile
+ // /dsymlink.down -> subdir/
+ // /symlink.absolute_out -> /etc/passwd
+ // /dsymlink.absolute_out -> /etc/
+ // /symlink.relative_in -> ../../tmp/cap_topdir/topfile
+ // /dsymlink.relative_in -> ../../tmp/cap_topdir/
+ // /symlink.relative_out -> ../../etc/passwd
+ // /dsymlink.relative_out -> ../../etc/
+ // /subdir/dsymlink.absolute_in -> /tmp/cap_topdir/
+ // /subdir/dsymlink.up -> ../
+ // /subdir/symlink.absolute_in -> /tmp/cap_topdir/topfile
+ // /subdir/symlink.up -> ../topfile
+ // (In practice, this is a little more complicated because tmpdir might
+ // not be "/tmp".)
+ OpenatTest() {
+ // Create a couple of nested directories
+ int rc = mkdir(TmpFile(TOPDIR), 0755);
+ EXPECT_OK(rc);
+ if (rc < 0) {
+ EXPECT_EQ(EEXIST, errno);
+ }
+ rc = mkdir(TmpFile(SUBDIR), 0755);
+ EXPECT_OK(rc);
+ if (rc < 0) {
+ EXPECT_EQ(EEXIST, errno);
+ }
+
+ // Figure out a path prefix (like "../..") that gets us to the root
+ // directory from TmpFile(TOPDIR).
+ const char *p = TmpFile(TOPDIR); // maybe "/tmp/somewhere/cap_topdir"
+ std::string dots2root = "..";
+ while (*p++ != '\0') {
+ if (*p == '/') {
+ dots2root += "/..";
+ }
+ }
+
+ // Create normal files in each.
+ CreateFile(TmpFile(TOPDIR "/topfile"), "Top-level file");
+ CreateFile(TmpFile(SUBDIR "/bottomfile"), "File in subdirectory");
+
+ // Create various symlinks to files.
+ EXPECT_OK(symlink("topfile", TmpFile(TOPDIR "/symlink.samedir")));
+ EXPECT_OK(symlink("subdir/bottomfile", TmpFile(TOPDIR "/symlink.down")));
+ EXPECT_OK(symlink(TmpFile(TOPDIR "/topfile"), TmpFile(SUBDIR "/symlink.absolute_in")));
+ EXPECT_OK(symlink("/etc/passwd", TmpFile(TOPDIR "/symlink.absolute_out")));
+ std::string dots2top = dots2root + TmpFile(TOPDIR "/topfile");
+ EXPECT_OK(symlink(dots2top.c_str(), TmpFile(TOPDIR "/symlink.relative_in")));
+ std::string dots2passwd = dots2root + "/etc/passwd";
+ EXPECT_OK(symlink(dots2passwd.c_str(), TmpFile(TOPDIR "/symlink.relative_out")));
+ EXPECT_OK(symlink("../topfile", TmpFile(SUBDIR "/symlink.up")));
+
+ // Create various symlinks to directories.
+ EXPECT_OK(symlink("./", TmpFile(TOPDIR "/dsymlink.samedir")));
+ EXPECT_OK(symlink("subdir/", TmpFile(TOPDIR "/dsymlink.down")));
+ EXPECT_OK(symlink(TmpFile(TOPDIR "/"), TmpFile(SUBDIR "/dsymlink.absolute_in")));
+ EXPECT_OK(symlink("/etc/", TmpFile(TOPDIR "/dsymlink.absolute_out")));
+ std::string dots2cwd = dots2root + tmpdir + "/";
+ EXPECT_OK(symlink(dots2cwd.c_str(), TmpFile(TOPDIR "/dsymlink.relative_in")));
+ std::string dots2etc = dots2root + "/etc/";
+ EXPECT_OK(symlink(dots2etc.c_str(), TmpFile(TOPDIR "/dsymlink.relative_out")));
+ EXPECT_OK(symlink("../", TmpFile(SUBDIR "/dsymlink.up")));
+
+ // Open directory FDs for those directories and for cwd.
+ dir_fd_ = open(TmpFile(TOPDIR), O_RDONLY);
+ EXPECT_OK(dir_fd_);
+ sub_fd_ = open(TmpFile(SUBDIR), O_RDONLY);
+ EXPECT_OK(sub_fd_);
+ cwd_ = openat(AT_FDCWD, ".", O_RDONLY);
+ EXPECT_OK(cwd_);
+ // Move into the directory for the test.
+ EXPECT_OK(fchdir(dir_fd_));
+ }
+ ~OpenatTest() {
+ fchdir(cwd_);
+ close(cwd_);
+ close(sub_fd_);
+ close(dir_fd_);
+ unlink(TmpFile(SUBDIR "/symlink.up"));
+ unlink(TmpFile(SUBDIR "/symlink.absolute_in"));
+ unlink(TmpFile(TOPDIR "/symlink.absolute_out"));
+ unlink(TmpFile(TOPDIR "/symlink.relative_in"));
+ unlink(TmpFile(TOPDIR "/symlink.relative_out"));
+ unlink(TmpFile(TOPDIR "/symlink.down"));
+ unlink(TmpFile(TOPDIR "/symlink.samedir"));
+ unlink(TmpFile(SUBDIR "/dsymlink.up"));
+ unlink(TmpFile(SUBDIR "/dsymlink.absolute_in"));
+ unlink(TmpFile(TOPDIR "/dsymlink.absolute_out"));
+ unlink(TmpFile(TOPDIR "/dsymlink.relative_in"));
+ unlink(TmpFile(TOPDIR "/dsymlink.relative_out"));
+ unlink(TmpFile(TOPDIR "/dsymlink.down"));
+ unlink(TmpFile(TOPDIR "/dsymlink.samedir"));
+ unlink(TmpFile(SUBDIR "/bottomfile"));
+ unlink(TmpFile(TOPDIR "/topfile"));
+ rmdir(TmpFile(SUBDIR));
+ rmdir(TmpFile(TOPDIR));
+ }
+
+ // Check openat(2) policing that is common across capabilities, capability mode and O_BENEATH.
+ void CheckPolicing(int oflag) {
+ // OK for normal access.
+ EXPECT_OPEN_OK(openat(dir_fd_, "topfile", O_RDONLY|oflag));
+ EXPECT_OPEN_OK(openat(dir_fd_, "subdir/bottomfile", O_RDONLY|oflag));
+ EXPECT_OPEN_OK(openat(sub_fd_, "bottomfile", O_RDONLY|oflag));
+ EXPECT_OPEN_OK(openat(sub_fd_, ".", O_RDONLY|oflag));
+
+ // Can't open paths with ".." in them.
+ EXPECT_OPENAT_FAIL_TRAVERSAL(sub_fd_, "../topfile", O_RDONLY|oflag);
+ EXPECT_OPENAT_FAIL_TRAVERSAL(sub_fd_, "../subdir/bottomfile", O_RDONLY|oflag);
+ EXPECT_OPENAT_FAIL_TRAVERSAL(sub_fd_, "..", O_RDONLY|oflag);
+
+#ifdef HAVE_OPENAT_INTERMEDIATE_DOTDOT
+ // OK for dotdot lookups that don't escape the top directory
+ EXPECT_OPEN_OK(openat(dir_fd_, "subdir/../topfile", O_RDONLY|oflag));
+#endif
+
+ // Check that we can't escape the top directory by the cunning
+ // ruse of going via a subdirectory.
+ EXPECT_OPENAT_FAIL_TRAVERSAL(dir_fd_, "subdir/../../etc/passwd", O_RDONLY|oflag);
+
+ // Should only be able to open symlinks that stay within the directory.
+ EXPECT_OPEN_OK(openat(dir_fd_, "symlink.samedir", O_RDONLY|oflag));
+ EXPECT_OPEN_OK(openat(dir_fd_, "symlink.down", O_RDONLY|oflag));
+ EXPECT_OPENAT_FAIL_TRAVERSAL(dir_fd_, "symlink.absolute_out", O_RDONLY|oflag);
+ EXPECT_OPENAT_FAIL_TRAVERSAL(dir_fd_, "symlink.relative_in", O_RDONLY|oflag);
+ EXPECT_OPENAT_FAIL_TRAVERSAL(dir_fd_, "symlink.relative_out", O_RDONLY|oflag);
+ EXPECT_OPENAT_FAIL_TRAVERSAL(sub_fd_, "symlink.absolute_in", O_RDONLY|oflag);
+ EXPECT_OPENAT_FAIL_TRAVERSAL(sub_fd_, "symlink.up", O_RDONLY|oflag);
+
+ EXPECT_OPEN_OK(openat(dir_fd_, "dsymlink.samedir/topfile", O_RDONLY|oflag));
+ EXPECT_OPEN_OK(openat(dir_fd_, "dsymlink.down/bottomfile", O_RDONLY|oflag));
+ EXPECT_OPENAT_FAIL_TRAVERSAL(dir_fd_, "dsymlink.absolute_out/passwd", O_RDONLY|oflag);
+ EXPECT_OPENAT_FAIL_TRAVERSAL(dir_fd_, "dsymlink.relative_in/topfile", O_RDONLY|oflag);
+ EXPECT_OPENAT_FAIL_TRAVERSAL(dir_fd_, "dsymlink.relative_out/passwd", O_RDONLY|oflag);
+ EXPECT_OPENAT_FAIL_TRAVERSAL(sub_fd_, "dsymlink.absolute_in/topfile", O_RDONLY|oflag);
+ EXPECT_OPENAT_FAIL_TRAVERSAL(sub_fd_, "dsymlink.up/topfile", O_RDONLY|oflag);
+
+ // Although recall that O_NOFOLLOW prevents symlink following in final component.
+ EXPECT_SYSCALL_FAIL(E_TOO_MANY_LINKS, openat(dir_fd_, "symlink.samedir", O_RDONLY|O_NOFOLLOW|oflag));
+ EXPECT_SYSCALL_FAIL(E_TOO_MANY_LINKS, openat(dir_fd_, "symlink.down", O_RDONLY|O_NOFOLLOW|oflag));
+ }
+
+ protected:
+ int dir_fd_;
+ int sub_fd_;
+ int cwd_;
+};
+
+TEST_F(OpenatTest, WithCapability) {
+ // Any kind of symlink can be opened relative to an ordinary directory FD.
+ EXPECT_OPEN_OK(openat(dir_fd_, "symlink.samedir", O_RDONLY));
+ EXPECT_OPEN_OK(openat(dir_fd_, "symlink.down", O_RDONLY));
+ EXPECT_OPEN_OK(openat(dir_fd_, "symlink.absolute_out", O_RDONLY));
+ EXPECT_OPEN_OK(openat(dir_fd_, "symlink.relative_in", O_RDONLY));
+ EXPECT_OPEN_OK(openat(dir_fd_, "symlink.relative_out", O_RDONLY));
+ EXPECT_OPEN_OK(openat(sub_fd_, "symlink.absolute_in", O_RDONLY));
+ EXPECT_OPEN_OK(openat(sub_fd_, "symlink.up", O_RDONLY));
+
+ // Now make both DFDs into Capsicum capabilities.
+ cap_rights_t r_rl;
+ cap_rights_init(&r_rl, CAP_READ, CAP_LOOKUP, CAP_FCHDIR);
+ EXPECT_OK(cap_rights_limit(dir_fd_, &r_rl));
+ EXPECT_OK(cap_rights_limit(sub_fd_, &r_rl));
+ CheckPolicing(0);
+ // Use of AT_FDCWD is independent of use of a capability.
+ // Can open paths starting with "/" against a capability dfd, because the dfd is ignored.
+}
+
+FORK_TEST_F(OpenatTest, InCapabilityMode) {
+ EXPECT_OK(cap_enter()); // Enter capability mode
+ CheckPolicing(0);
+
+ // Use of AT_FDCWD is banned in capability mode.
+ EXPECT_CAPMODE(openat(AT_FDCWD, "topfile", O_RDONLY));
+ EXPECT_CAPMODE(openat(AT_FDCWD, "subdir/bottomfile", O_RDONLY));
+ EXPECT_CAPMODE(openat(AT_FDCWD, "/etc/passwd", O_RDONLY));
+
+ // Can't open paths starting with "/" in capability mode.
+ EXPECT_OPENAT_FAIL_TRAVERSAL(dir_fd_, "/etc/passwd", O_RDONLY);
+ EXPECT_OPENAT_FAIL_TRAVERSAL(sub_fd_, "/etc/passwd", O_RDONLY);
+}
+
+#ifdef O_BENEATH
+TEST_F(OpenatTest, WithFlag) {
+ CheckPolicing(O_BENEATH);
+
+ // Check with AT_FDCWD.
+ EXPECT_OPEN_OK(openat(AT_FDCWD, "topfile", O_RDONLY|O_BENEATH));
+ EXPECT_OPEN_OK(openat(AT_FDCWD, "subdir/bottomfile", O_RDONLY|O_BENEATH));
+
+ // Can't open paths starting with "/" with O_BENEATH specified.
+ EXPECT_OPENAT_FAIL_TRAVERSAL(AT_FDCWD, "/etc/passwd", O_RDONLY|O_BENEATH);
+ EXPECT_OPENAT_FAIL_TRAVERSAL(dir_fd_, "/etc/passwd", O_RDONLY|O_BENEATH);
+ EXPECT_OPENAT_FAIL_TRAVERSAL(sub_fd_, "/etc/passwd", O_RDONLY|O_BENEATH);
+}
+
+FORK_TEST_F(OpenatTest, WithFlagInCapabilityMode) {
+ EXPECT_OK(cap_enter()); // Enter capability mode
+ CheckPolicing(O_BENEATH);
+}
+#endif
Index: contrib/capsicum-test/overhead.cc
===================================================================
--- /dev/null
+++ contrib/capsicum-test/overhead.cc
@@ -0,0 +1,45 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "capsicum.h"
+#include "syscalls.h"
+#include "capsicum-test.h"
+
+#ifdef HAVE_SYSCALL
+double RepeatSyscall(int count, int nr, long arg1, long arg2, long arg3) {
+ const clock_t t0 = clock(); // or gettimeofday or whatever
+ for (int ii = 0; ii < count; ii++) {
+ syscall(nr, arg1, arg2, arg3);
+ }
+ const clock_t t1 = clock();
+ return (t1 - t0) / (double)CLOCKS_PER_SEC;
+}
+
+typedef int (*EntryFn)(void);
+
+double CompareSyscall(EntryFn entry_fn, int count, int nr,
+ long arg1, long arg2, long arg3) {
+ double bare = RepeatSyscall(count, nr, arg1, arg2, arg3);
+ EXPECT_OK(entry_fn());
+ double capmode = RepeatSyscall(count, nr, arg1, arg2, arg3);
+ if (verbose) fprintf(stderr, "%d iterations bare=%fs capmode=%fs ratio=%.2f%%\n",
+ count, bare, capmode, 100.0*capmode/bare);
+ if (bare==0.0) {
+ if (capmode==0.0) return 1.0;
+ return 999.0;
+ }
+ return capmode/bare;
+}
+
+FORK_TEST(Overhead, GetTid) {
+ EXPECT_GT(10, CompareSyscall(&cap_enter, 10000, __NR_gettid, 0, 0, 0));
+}
+FORK_TEST(Overhead, Seek) {
+ int fd = open("/etc/passwd", O_RDONLY);
+ EXPECT_GT(50, CompareSyscall(&cap_enter, 10000, __NR_lseek, fd, 0, SEEK_SET));
+ close(fd);
+}
+#endif
Index: contrib/capsicum-test/procdesc.cc
===================================================================
--- /dev/null
+++ contrib/capsicum-test/procdesc.cc
@@ -0,0 +1,977 @@
+// Tests for the process descriptor API for Linux.
+#include <sys/types.h>
+#include <sys/resource.h>
+#include <sys/select.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <pthread.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <iomanip>
+#include <map>
+
+#include "capsicum.h"
+#include "syscalls.h"
+#include "capsicum-test.h"
+
+#ifndef __WALL
+// Linux requires __WALL in order for waitpid(specific_pid,...) to
+// see and reap any specific pid. Define this to nothing for platforms
+// (FreeBSD) where it doesn't exist, to reduce macroing.
+#define __WALL 0
+#endif
+
+// TODO(drysdale): it would be nice to use proper synchronization between
+// processes, rather than synchronization-via-sleep; faster too.
+
+
+//------------------------------------------------
+// Utilities for the tests.
+
+static pid_t pdwait4_(int pd, int *status, int options, struct rusage *ru) {
+#ifdef HAVE_PDWAIT4
+ return pdwait4(pd, status, options, ru);
+#else
+ // Simulate pdwait4() with wait4(pdgetpid()); this won't work in capability mode.
+ pid_t pid = -1;
+ int rc = pdgetpid(pd, &pid);
+ if (rc < 0) {
+ return rc;
+ }
+ options |= __WALL;
+ return wait4(pid, status, options, ru);
+#endif
+}
+
+static void print_rusage(FILE *f, struct rusage *ru) {
+ fprintf(f, " User CPU time=%ld.%06ld\n", (long)ru->ru_utime.tv_sec, (long)ru->ru_utime.tv_usec);
+ fprintf(f, " System CPU time=%ld.%06ld\n", (long)ru->ru_stime.tv_sec, (long)ru->ru_stime.tv_usec);
+ fprintf(f, " Max RSS=%ld\n", ru->ru_maxrss);
+}
+
+static void print_stat(FILE *f, const struct stat *stat) {
+ fprintf(f,
+ "{ .st_dev=%ld, st_ino=%ld, st_mode=%04o, st_nlink=%ld, st_uid=%d, st_gid=%d,\n"
+ " .st_rdev=%ld, .st_size=%ld, st_blksize=%ld, .st_block=%ld,\n "
+#ifdef HAVE_STAT_BIRTHTIME
+ ".st_birthtime=%ld, "
+#endif
+ ".st_atime=%ld, .st_mtime=%ld, .st_ctime=%ld}\n",
+ (long)stat->st_dev, (long)stat->st_ino, stat->st_mode,
+ (long)stat->st_nlink, stat->st_uid, stat->st_gid,
+ (long)stat->st_rdev, (long)stat->st_size, (long)stat->st_blksize,
+ (long)stat->st_blocks,
+#ifdef HAVE_STAT_BIRTHTIME
+ (long)stat->st_birthtime,
+#endif
+ (long)stat->st_atime, (long)stat->st_mtime, (long)stat->st_ctime);
+}
+
+static std::map<int,bool> had_signal;
+static void handle_signal(int x) {
+ had_signal[x] = true;
+}
+
+// Check that the given child process terminates as expected.
+void CheckChildFinished(pid_t pid, bool signaled=false) {
+ // Wait for the child to finish.
+ int rc;
+ int status = 0;
+ do {
+ rc = waitpid(pid, &status, __WALL);
+ if (rc < 0) {
+ fprintf(stderr, "Warning: waitpid error %s (%d)\n", strerror(errno), errno);
+ ADD_FAILURE() << "Failed to wait for child";
+ break;
+ } else if (rc == pid) {
+ break;
+ }
+ } while (true);
+ EXPECT_EQ(pid, rc);
+ if (rc == pid) {
+ if (signaled) {
+ EXPECT_TRUE(WIFSIGNALED(status));
+ } else {
+ EXPECT_TRUE(WIFEXITED(status)) << std::hex << status;
+ EXPECT_EQ(0, WEXITSTATUS(status));
+ }
+ }
+}
+
+//------------------------------------------------
+// Basic tests of process descriptor functionality
+
+TEST(Pdfork, Simple) {
+ int pd = -1;
+ pid_t parent = getpid_();
+ int pid = pdfork(&pd, 0);
+ EXPECT_OK(pid);
+ if (pid == 0) {
+ // Child: check pid values.
+ EXPECT_EQ(-1, pd);
+ EXPECT_NE(parent, getpid_());
+ EXPECT_EQ(parent, getppid());
+ sleep(1);
+ exit(0);
+ }
+ usleep(100); // ensure the child has a chance to run
+ EXPECT_NE(-1, pd);
+ EXPECT_PID_ALIVE(pid);
+ int pid_got;
+ EXPECT_OK(pdgetpid(pd, &pid_got));
+ EXPECT_EQ(pid, pid_got);
+
+ // Wait long enough for the child to exit().
+ sleep(2);
+ EXPECT_PID_ZOMBIE(pid);
+
+ // Wait for the the child.
+ int status;
+ struct rusage ru;
+ memset(&ru, 0, sizeof(ru));
+ int waitrc = pdwait4_(pd, &status, 0, &ru);
+ EXPECT_EQ(pid, waitrc);
+ if (verbose) {
+ fprintf(stderr, "For pd %d pid %d:\n", pd, pid);
+ print_rusage(stderr, &ru);
+ }
+ EXPECT_PID_GONE(pid);
+
+ // Can only pdwait4(pd) once (as initial call reaps zombie).
+ memset(&ru, 0, sizeof(ru));
+ EXPECT_EQ(-1, pdwait4_(pd, &status, 0, &ru));
+ EXPECT_EQ(ECHILD, errno);
+
+ EXPECT_OK(close(pd));
+}
+
+TEST(Pdfork, InvalidFlag) {
+ int pd = -1;
+ int pid = pdfork(&pd, PD_DAEMON<<5);
+ if (pid == 0) {
+ exit(1);
+ }
+ EXPECT_EQ(-1, pid);
+ EXPECT_EQ(EINVAL, errno);
+ if (pid > 0) waitpid(pid, NULL, __WALL);
+}
+
+TEST(Pdfork, TimeCheck) {
+ time_t now = time(NULL); // seconds since epoch
+ EXPECT_NE(-1, now);
+ if (verbose) fprintf(stderr, "Calling pdfork around %ld\n", (long)(long)now);
+
+ int pd = -1;
+ pid_t pid = pdfork(&pd, 0);
+ EXPECT_OK(pid);
+ if (pid == 0) {
+ // Child: check we didn't get a valid process descriptor then exit.
+ EXPECT_EQ(-1, pdgetpid(pd, &pid));
+ EXPECT_EQ(EBADF, errno);
+ exit(HasFailure());
+ }
+
+#ifdef HAVE_PROCDESC_FSTAT
+ // Parent process. Ensure that [acm]times have been set correctly.
+ struct stat stat;
+ memset(&stat, 0, sizeof(stat));
+ EXPECT_OK(fstat(pd, &stat));
+ if (verbose) print_stat(stderr, &stat);
+
+#ifdef HAVE_STAT_BIRTHTIME
+ EXPECT_GE(now, stat.st_birthtime);
+ EXPECT_EQ(stat.st_birthtime, stat.st_atime);
+#endif
+ EXPECT_LT((now - stat.st_atime), 2);
+ EXPECT_EQ(stat.st_atime, stat.st_ctime);
+ EXPECT_EQ(stat.st_ctime, stat.st_mtime);
+#endif
+
+ // Wait for the child to finish.
+ pid_t pd_pid = -1;
+ EXPECT_OK(pdgetpid(pd, &pd_pid));
+ EXPECT_EQ(pid, pd_pid);
+ CheckChildFinished(pid);
+}
+
+TEST(Pdfork, UseDescriptor) {
+ int pd = -1;
+ pid_t pid = pdfork(&pd, 0);
+ EXPECT_OK(pid);
+ if (pid == 0) {
+ // Child: immediately exit
+ exit(0);
+ }
+ CheckChildFinished(pid);
+}
+
+TEST(Pdfork, NonProcessDescriptor) {
+ int fd = open("/etc/passwd", O_RDONLY);
+ EXPECT_OK(fd);
+ // pd*() operations should fail on a non-process descriptor.
+ EXPECT_EQ(-1, pdkill(fd, SIGUSR1));
+ int status;
+ EXPECT_EQ(-1, pdwait4_(fd, &status, 0, NULL));
+ pid_t pid;
+ EXPECT_EQ(-1, pdgetpid(fd, &pid));
+ close(fd);
+}
+
+static void *SubThreadMain(void *) {
+ while (true) {
+ if (verbose) fprintf(stderr, " subthread: \"I aten't dead\"\n");
+ usleep(100000);
+ }
+ return NULL;
+}
+
+static void *ThreadMain(void *) {
+ int pd;
+ pid_t child = pdfork(&pd, 0);
+ if (child == 0) {
+ // Child: start a subthread then loop
+ pthread_t child_subthread;
+ EXPECT_OK(pthread_create(&child_subthread, NULL, SubThreadMain, NULL));
+ while (true) {
+ if (verbose) fprintf(stderr, " pdforked process %d: \"I aten't dead\"\n", getpid());
+ usleep(100000);
+ }
+ exit(0);
+ }
+ if (verbose) fprintf(stderr, " thread generated pd %d\n", pd);
+ sleep(2);
+
+ // Pass the process descriptor back to the main thread.
+ return reinterpret_cast<void *>(pd);
+}
+
+TEST(Pdfork, FromThread) {
+ // Fire off a new thread to do all of the creation work.
+ pthread_t child_thread;
+ EXPECT_OK(pthread_create(&child_thread, NULL, ThreadMain, NULL));
+ void *data;
+ EXPECT_OK(pthread_join(child_thread, &data));
+ int pd = reinterpret_cast<intptr_t>(data);
+ if (verbose) fprintf(stderr, "retrieved pd %d from terminated thread\n", pd);
+
+ // Kill and reap.
+ pid_t pid;
+ EXPECT_OK(pdgetpid(pd, &pid));
+ EXPECT_OK(pdkill(pd, SIGKILL));
+ int status;
+ EXPECT_EQ(pid, pdwait4_(pd, &status, 0, NULL));
+ EXPECT_TRUE(WIFSIGNALED(status));
+}
+
+//------------------------------------------------
+// More complicated tests.
+
+
+// Test fixture that pdfork()s off a child process, which terminates
+// when it receives anything on a pipe.
+class PipePdforkBase : public ::testing::Test {
+ public:
+ PipePdforkBase(int pdfork_flags) : pd_(-1), pid_(-1) {
+ had_signal.clear();
+ int pipes[2];
+ EXPECT_OK(pipe(pipes));
+ pipe_ = pipes[1];
+ int parent = getpid_();
+ if (verbose) fprintf(stderr, "[%d] about to pdfork()\n", getpid_());
+ int rc = pdfork(&pd_, pdfork_flags);
+ EXPECT_OK(rc);
+ if (rc == 0) {
+ // Child process: blocking-read an int from the pipe then exit with that value.
+ EXPECT_NE(parent, getpid_());
+ EXPECT_EQ(parent, getppid());
+ if (verbose) fprintf(stderr, " [%d] child of %d waiting for value on pipe\n", getpid_(), getppid());
+ read(pipes[0], &rc, sizeof(rc));
+ if (verbose) fprintf(stderr, " [%d] got value %d on pipe, exiting\n", getpid_(), rc);
+ exit(rc);
+ }
+ pid_ = rc;
+ usleep(100); // ensure the child has a chance to run
+ }
+ ~PipePdforkBase() {
+ // Terminate by any means necessary.
+ if (pd_ > 0) {
+ pdkill(pd_, SIGKILL);
+ close(pd_);
+ }
+ if (pid_ > 0) {
+ kill(pid_, SIGKILL);
+ waitpid(pid_, NULL, __WALL|WNOHANG);
+ }
+ // Check signal expectations.
+ EXPECT_FALSE(had_signal[SIGCHLD]);
+ }
+ int TerminateChild() {
+ // Tell the child to exit.
+ int zero = 0;
+ if (verbose) fprintf(stderr, "[%d] write 0 to pipe\n", getpid_());
+ return write(pipe_, &zero, sizeof(zero));
+ }
+ protected:
+ int pd_;
+ int pipe_;
+ pid_t pid_;
+};
+
+class PipePdfork : public PipePdforkBase {
+ public:
+ PipePdfork() : PipePdforkBase(0) {}
+};
+
+class PipePdforkDaemon : public PipePdforkBase {
+ public:
+ PipePdforkDaemon() : PipePdforkBase(PD_DAEMON) {}
+};
+
+// Can we poll a process descriptor?
+TEST_F(PipePdfork, Poll) {
+ // Poll the process descriptor, nothing happening.
+ struct pollfd fdp;
+ fdp.fd = pd_;
+ fdp.events = POLLIN | POLLERR | POLLHUP;
+ fdp.revents = 0;
+ EXPECT_EQ(0, poll(&fdp, 1, 0));
+
+ TerminateChild();
+
+ // Poll again, should have activity on the process descriptor.
+ EXPECT_EQ(1, poll(&fdp, 1, 2000));
+ EXPECT_TRUE(fdp.revents & POLLHUP);
+
+ // Poll a third time, still have POLLHUP.
+ fdp.revents = 0;
+ EXPECT_EQ(1, poll(&fdp, 1, 0));
+ EXPECT_TRUE(fdp.revents & POLLHUP);
+}
+
+// Can multiple processes poll on the same descriptor?
+TEST_F(PipePdfork, PollMultiple) {
+ int child = fork();
+ EXPECT_OK(child);
+ if (child == 0) {
+ // Child: wait to give time for setup, then write to the pipe (which will
+ // induce exit of the pdfork()ed process) and exit.
+ sleep(1);
+ TerminateChild();
+ exit(0);
+ }
+ usleep(100); // ensure the child has a chance to run
+
+ // Fork again
+ int doppel = fork();
+ EXPECT_OK(doppel);
+ // We now have:
+ // pid A: main process, here
+ // |--pid B: pdfork()ed process, blocked on read()
+ // |--pid C: fork()ed process, in sleep(1) above
+ // +--pid D: doppel process, here
+
+ // Both A and D execute the following code.
+ // First, check no activity on the process descriptor yet.
+ struct pollfd fdp;
+ fdp.fd = pd_;
+ fdp.events = POLLIN | POLLERR | POLLHUP;
+ fdp.revents = 0;
+ EXPECT_EQ(0, poll(&fdp, 1, 0));
+
+ // Now, wait (indefinitely) for activity on the process descriptor.
+ // We expect:
+ // - pid C will finish its sleep, write to the pipe and exit
+ // - pid B will unblock from read(), and exit
+ // - this will generate an event on the process descriptor...
+ // - ...in both process A and process D.
+ EXPECT_EQ(1, poll(&fdp, 1, 2000));
+ EXPECT_TRUE(fdp.revents & POLLHUP);
+
+ if (doppel == 0) {
+ // Child: process D exits.
+ exit(0);
+ } else {
+ // Parent: wait on process D.
+ int rc = 0;
+ waitpid(doppel, &rc, __WALL);
+ EXPECT_TRUE(WIFEXITED(rc));
+ EXPECT_EQ(0, WEXITSTATUS(rc));
+ // Also wait on process B.
+ CheckChildFinished(child);
+ }
+}
+
+// Check that exit status/rusage for a dead pdfork()ed child can be retrieved
+// via any process descriptor, multiple times.
+TEST_F(PipePdfork, MultipleRetrieveExitStatus) {
+ EXPECT_PID_ALIVE(pid_);
+ int pd_copy = dup(pd_);
+ EXPECT_LT(0, TerminateChild());
+
+ int status;
+ struct rusage ru;
+ memset(&ru, 0, sizeof(ru));
+ int waitrc = pdwait4_(pd_copy, &status, 0, &ru);
+ EXPECT_EQ(pid_, waitrc);
+ if (verbose) {
+ fprintf(stderr, "For pd %d -> pid %d:\n", pd_, pid_);
+ print_rusage(stderr, &ru);
+ }
+ EXPECT_PID_GONE(pid_);
+
+#ifdef NOTYET
+ // Child has been reaped, so original process descriptor dangles but
+ // still has access to rusage information.
+ memset(&ru, 0, sizeof(ru));
+ EXPECT_EQ(0, pdwait4_(pd_, &status, 0, &ru));
+#endif
+ close(pd_copy);
+}
+
+TEST_F(PipePdfork, ChildExit) {
+ EXPECT_PID_ALIVE(pid_);
+ EXPECT_LT(0, TerminateChild());
+ EXPECT_PID_DEAD(pid_);
+
+ int status;
+ int rc = pdwait4_(pd_, &status, 0, NULL);
+ EXPECT_OK(rc);
+ EXPECT_EQ(pid_, rc);
+ pid_ = 0;
+}
+
+#ifdef HAVE_PROC_FDINFO
+TEST_F(PipePdfork, FdInfo) {
+ char buffer[1024];
+ sprintf(buffer, "/proc/%d/fdinfo/%d", getpid_(), pd_);
+ int procfd = open(buffer, O_RDONLY);
+ EXPECT_OK(procfd);
+
+ EXPECT_OK(read(procfd, buffer, sizeof(buffer)));
+ // The fdinfo should include the file pos of the underlying file
+ EXPECT_NE((char*)NULL, strstr(buffer, "pos:\t0")) << buffer;
+ // ...and the underlying pid
+ char pidline[256];
+ sprintf(pidline, "pid:\t%d", pid_);
+ EXPECT_NE((char*)NULL, strstr(buffer, pidline)) << buffer;
+ close(procfd);
+}
+#endif
+
+// Closing a normal process descriptor terminates the underlying process.
+TEST_F(PipePdfork, Close) {
+ sighandler_t original = signal(SIGCHLD, handle_signal);
+ EXPECT_PID_ALIVE(pid_);
+ int status;
+ EXPECT_EQ(0, waitpid(pid_, &status, __WALL|WNOHANG));
+
+ EXPECT_OK(close(pd_));
+ pd_ = -1;
+ EXPECT_FALSE(had_signal[SIGCHLD]);
+ EXPECT_PID_DEAD(pid_);
+
+#ifdef __FreeBSD__
+ EXPECT_EQ(-1, waitpid(pid_, NULL, __WALL));
+ EXPECT_EQ(errno, ECHILD);
+#else
+ // Having closed the process descriptor means that pdwait4(pd) now doesn't work.
+ int rc = pdwait4_(pd_, &status, 0, NULL);
+ EXPECT_EQ(-1, rc);
+ EXPECT_EQ(EBADF, errno);
+
+ // Closing all process descriptors means the the child can only be reaped via pid.
+ EXPECT_EQ(pid_, waitpid(pid_, &status, __WALL|WNOHANG));
+#endif
+ signal(SIGCHLD, original);
+}
+
+TEST_F(PipePdfork, CloseLast) {
+ sighandler_t original = signal(SIGCHLD, handle_signal);
+ // Child should only die when last process descriptor is closed.
+ EXPECT_PID_ALIVE(pid_);
+ int pd_other = dup(pd_);
+
+ EXPECT_OK(close(pd_));
+ pd_ = -1;
+
+ EXPECT_PID_ALIVE(pid_);
+ int status;
+ EXPECT_EQ(0, waitpid(pid_, &status, __WALL|WNOHANG));
+
+ // Can no longer pdwait4() the closed process descriptor...
+ EXPECT_EQ(-1, pdwait4_(pd_, &status, WNOHANG, NULL));
+ EXPECT_EQ(EBADF, errno);
+ // ...but can pdwait4() the still-open process descriptor.
+ errno = 0;
+ EXPECT_EQ(0, pdwait4_(pd_other, &status, WNOHANG, NULL));
+ EXPECT_EQ(0, errno);
+
+ EXPECT_OK(close(pd_other));
+ EXPECT_PID_DEAD(pid_);
+
+ EXPECT_FALSE(had_signal[SIGCHLD]);
+ signal(SIGCHLD, original);
+}
+
+FORK_TEST(Pdfork, OtherUser) {
+ REQUIRE_ROOT();
+ int pd;
+ pid_t pid = pdfork(&pd, 0);
+ EXPECT_OK(pid);
+ if (pid == 0) {
+ // Child process: loop forever.
+ while (true) usleep(100000);
+ }
+ usleep(100);
+
+ // Now that the second process has been pdfork()ed, change euid.
+ setuid(other_uid);
+ if (verbose) fprintf(stderr, "uid=%d euid=%d\n", getuid(), geteuid());
+
+ // Fail to kill child with normal PID operation.
+ EXPECT_EQ(-1, kill(pid, SIGKILL));
+ EXPECT_EQ(EPERM, errno);
+ EXPECT_PID_ALIVE(pid);
+
+ // Succeed with pdkill though.
+ EXPECT_OK(pdkill(pd, SIGKILL));
+ EXPECT_PID_ZOMBIE(pid);
+
+ int status;
+ int rc = pdwait4_(pd, &status, WNOHANG, NULL);
+ EXPECT_OK(rc);
+ EXPECT_EQ(pid, rc);
+ EXPECT_TRUE(WIFSIGNALED(status));
+}
+
+TEST_F(PipePdfork, WaitPidThenPd) {
+ TerminateChild();
+ int status;
+ // If we waitpid(pid) first...
+ int rc = waitpid(pid_, &status, __WALL);
+ EXPECT_OK(rc);
+ EXPECT_EQ(pid_, rc);
+
+#ifdef NOTYET
+ // ...the zombie is reaped but we can still subsequently pdwait4(pd).
+ EXPECT_EQ(0, pdwait4_(pd_, &status, 0, NULL));
+#endif
+}
+
+TEST_F(PipePdfork, WaitPdThenPid) {
+ TerminateChild();
+ int status;
+ // If we pdwait4(pd) first...
+ int rc = pdwait4_(pd_, &status, 0, NULL);
+ EXPECT_OK(rc);
+ EXPECT_EQ(pid_, rc);
+
+ // ...the zombie is reaped and cannot subsequently waitpid(pid).
+ EXPECT_EQ(-1, waitpid(pid_, &status, __WALL));
+ EXPECT_EQ(ECHILD, errno);
+}
+
+// Setting PD_DAEMON prevents close() from killing the child.
+TEST_F(PipePdforkDaemon, Close) {
+ EXPECT_OK(close(pd_));
+ pd_ = -1;
+ EXPECT_PID_ALIVE(pid_);
+
+ // Can still explicitly kill it via the pid.
+ if (pid_ > 0) {
+ EXPECT_OK(kill(pid_, SIGKILL));
+ EXPECT_PID_DEAD(pid_);
+ }
+}
+
+static void TestPdkill(pid_t pid, int pd) {
+ EXPECT_PID_ALIVE(pid);
+ // SIGCONT is ignored by default.
+ EXPECT_OK(pdkill(pd, SIGCONT));
+ EXPECT_PID_ALIVE(pid);
+
+ // SIGINT isn't
+ EXPECT_OK(pdkill(pd, SIGINT));
+ EXPECT_PID_DEAD(pid);
+
+ // pdkill() on zombie is no-op.
+ errno = 0;
+ EXPECT_EQ(0, pdkill(pd, SIGINT));
+ EXPECT_EQ(0, errno);
+
+ // pdkill() on reaped process gives -ESRCH.
+ CheckChildFinished(pid, true);
+ EXPECT_EQ(-1, pdkill(pd, SIGINT));
+ EXPECT_EQ(ESRCH, errno);
+}
+
+TEST_F(PipePdfork, Pdkill) {
+ TestPdkill(pid_, pd_);
+}
+
+TEST_F(PipePdforkDaemon, Pdkill) {
+ TestPdkill(pid_, pd_);
+}
+
+TEST(Pdfork, PdkillOtherSignal) {
+ int pd = -1;
+ int pid = pdfork(&pd, 0);
+ EXPECT_OK(pid);
+ if (pid == 0) {
+ // Child: watch for SIGUSR1 forever.
+ had_signal.clear();
+ signal(SIGUSR1, handle_signal);
+ while (!had_signal[SIGUSR1]) {
+ usleep(100000);
+ }
+ exit(123);
+ }
+ sleep(1);
+
+ // Send an invalid signal.
+ EXPECT_EQ(-1, pdkill(pd, 0xFFFF));
+ EXPECT_EQ(EINVAL, errno);
+
+ // Send an expected SIGUSR1 to the pdfork()ed child.
+ EXPECT_PID_ALIVE(pid);
+ pdkill(pd, SIGUSR1);
+ EXPECT_PID_DEAD(pid);
+
+ // Child's exit status confirms whether it received the signal.
+ int status;
+ int rc = waitpid(pid, &status, __WALL);
+ EXPECT_OK(rc);
+ EXPECT_EQ(pid, rc);
+ EXPECT_TRUE(WIFEXITED(status)) << "0x" << std::hex << rc;
+ EXPECT_EQ(123, WEXITSTATUS(status));
+}
+
+pid_t PdforkParentDeath(int pdfork_flags) {
+ // Set up:
+ // pid A: main process, here
+ // +--pid B: fork()ed process, sleep(4)s then exits
+ // +--pid C: pdfork()ed process, looping forever
+ int sock_fds[2];
+ EXPECT_OK(socketpair(AF_UNIX, SOCK_STREAM, 0, sock_fds));
+ if (verbose) fprintf(stderr, "[%d] parent about to fork()...\n", getpid_());
+ pid_t child = fork();
+ EXPECT_OK(child);
+ if (child == 0) {
+ int pd;
+ if (verbose) fprintf(stderr, " [%d] child about to pdfork()...\n", getpid_());
+ pid_t grandchild = pdfork(&pd, pdfork_flags);
+ if (grandchild == 0) {
+ while (true) {
+ if (verbose) fprintf(stderr, " [%d] grandchild: \"I aten't dead\"\n", getpid_());
+ sleep(1);
+ }
+ }
+ if (verbose) fprintf(stderr, " [%d] pdfork()ed grandchild %d, sending ID to parent\n", getpid_(), grandchild);
+ // send grandchild pid to parent
+ write(sock_fds[1], &grandchild, sizeof(grandchild));
+ sleep(4);
+ if (verbose) fprintf(stderr, " [%d] child terminating\n", getpid_());
+ exit(0);
+ }
+ if (verbose) fprintf(stderr, "[%d] fork()ed child is %d\n", getpid_(), child);
+ pid_t grandchild;
+ read(sock_fds[0], &grandchild, sizeof(grandchild));
+ if (verbose) fprintf(stderr, "[%d] receive grandchild id %d\n", getpid_(), grandchild);
+ EXPECT_PID_ALIVE(child);
+ EXPECT_PID_ALIVE(grandchild);
+ sleep(6);
+ // Child dies, closing its process descriptor for the grandchild.
+ EXPECT_PID_DEAD(child);
+ CheckChildFinished(child);
+ return grandchild;
+}
+
+TEST(Pdfork, Bagpuss) {
+ // "And of course when Bagpuss goes to sleep, all his friends go to sleep too"
+ pid_t grandchild = PdforkParentDeath(0);
+ // By default: child death => closed process descriptor => grandchild death.
+ EXPECT_PID_DEAD(grandchild);
+}
+
+TEST(Pdfork, BagpussDaemon) {
+ pid_t grandchild = PdforkParentDeath(PD_DAEMON);
+ // With PD_DAEMON: child death => closed process descriptor => no effect on grandchild.
+ EXPECT_PID_ALIVE(grandchild);
+ if (grandchild > 0) {
+ EXPECT_OK(kill(grandchild, SIGKILL));
+ }
+}
+
+// The exit of a pdfork()ed process should not generate SIGCHLD.
+TEST_F(PipePdfork, NoSigchld) {
+ had_signal.clear();
+ sighandler_t original = signal(SIGCHLD, handle_signal);
+ TerminateChild();
+ int rc = 0;
+ // Can waitpid() for the specific pid of the pdfork()ed child.
+ EXPECT_EQ(pid_, waitpid(pid_, &rc, __WALL));
+ EXPECT_TRUE(WIFEXITED(rc)) << "0x" << std::hex << rc;
+ EXPECT_FALSE(had_signal[SIGCHLD]);
+ signal(SIGCHLD, original);
+}
+
+// The exit of a pdfork()ed process whose process descriptors have
+// all been closed should generate SIGCHLD. The child process needs
+// PD_DAEMON to survive the closure of the process descriptors.
+TEST_F(PipePdforkDaemon, NoPDSigchld) {
+ had_signal.clear();
+ sighandler_t original = signal(SIGCHLD, handle_signal);
+
+ EXPECT_OK(close(pd_));
+ TerminateChild();
+#ifdef __FreeBSD__
+ EXPECT_EQ(-1, waitpid(pid_, NULL, __WALL));
+ EXPECT_EQ(errno, ECHILD);
+#else
+ int rc = 0;
+ // Can waitpid() for the specific pid of the pdfork()ed child.
+ EXPECT_EQ(pid_, waitpid(pid_, &rc, __WALL));
+ EXPECT_TRUE(WIFEXITED(rc)) << "0x" << std::hex << rc;
+#endif
+ EXPECT_FALSE(had_signal[SIGCHLD]);
+ signal(SIGCHLD, original);
+}
+
+#ifdef HAVE_PROCDESC_FSTAT
+TEST_F(PipePdfork, ModeBits) {
+ // Owner rwx bits indicate liveness of child
+ struct stat stat;
+ memset(&stat, 0, sizeof(stat));
+ EXPECT_OK(fstat(pd_, &stat));
+ if (verbose) print_stat(stderr, &stat);
+ EXPECT_EQ(S_IRWXU, (long)(stat.st_mode & S_IRWXU));
+
+ TerminateChild();
+ usleep(100000);
+
+ memset(&stat, 0, sizeof(stat));
+ EXPECT_OK(fstat(pd_, &stat));
+ if (verbose) print_stat(stderr, &stat);
+ EXPECT_EQ(0, (int)(stat.st_mode & S_IRWXU));
+}
+#endif
+
+TEST_F(PipePdfork, WildcardWait) {
+ // TODO(FreeBSD): make wildcard wait ignore pdfork()ed children
+ // https://bugs.freebsd.org/201054
+ TerminateChild();
+ sleep(1); // Ensure child is truly dead.
+
+ // Wildcard waitpid(-1) should not see the pdfork()ed child because
+ // there is still a process descriptor for it.
+ int rc;
+ EXPECT_EQ(-1, waitpid(-1, &rc, WNOHANG));
+ EXPECT_EQ(ECHILD, errno);
+
+ EXPECT_OK(close(pd_));
+ pd_ = -1;
+}
+
+FORK_TEST(Pdfork, Pdkill) {
+ had_signal.clear();
+ int pd;
+ pid_t pid = pdfork(&pd, 0);
+ EXPECT_OK(pid);
+
+ if (pid == 0) {
+ // Child: set a SIGINT handler and sleep.
+ had_signal.clear();
+ signal(SIGINT, handle_signal);
+ if (verbose) fprintf(stderr, "[%d] child about to sleep(10)\n", getpid_());
+ int left = sleep(10);
+ if (verbose) fprintf(stderr, "[%d] child slept, %d sec left, had[SIGINT]=%d\n",
+ getpid_(), left, had_signal[SIGINT]);
+ // Expect this sleep to be interrupted by the signal (and so left > 0).
+ exit(left == 0);
+ }
+
+ // Parent: get child's PID.
+ pid_t pd_pid;
+ EXPECT_OK(pdgetpid(pd, &pd_pid));
+ EXPECT_EQ(pid, pd_pid);
+
+ // Interrupt the child after a second.
+ sleep(1);
+ EXPECT_OK(pdkill(pd, SIGINT));
+
+ // Make sure the child finished properly (caught signal then exited).
+ CheckChildFinished(pid);
+}
+
+FORK_TEST(Pdfork, PdkillSignal) {
+ int pd;
+ pid_t pid = pdfork(&pd, 0);
+ EXPECT_OK(pid);
+
+ if (pid == 0) {
+ // Child: sleep. No SIGINT handler.
+ if (verbose) fprintf(stderr, "[%d] child about to sleep(10)\n", getpid_());
+ int left = sleep(10);
+ if (verbose) fprintf(stderr, "[%d] child slept, %d sec left\n", getpid_(), left);
+ exit(99);
+ }
+
+ // Kill the child (as it doesn't handle SIGINT).
+ sleep(1);
+ EXPECT_OK(pdkill(pd, SIGINT));
+
+ // Make sure the child finished properly (terminated by signal).
+ CheckChildFinished(pid, true);
+}
+
+//------------------------------------------------
+// Test interactions with other parts of Capsicum:
+// - capability mode
+// - capabilities
+
+FORK_TEST(Pdfork, DaemonUnrestricted) {
+ EXPECT_OK(cap_enter());
+ int fd;
+
+ // Capability mode leaves pdfork() available, with and without flag.
+ int rc;
+ rc = pdfork(&fd, PD_DAEMON);
+ EXPECT_OK(rc);
+ if (rc == 0) {
+ // Child: immediately terminate.
+ exit(0);
+ }
+
+ rc = pdfork(&fd, 0);
+ EXPECT_OK(rc);
+ if (rc == 0) {
+ // Child: immediately terminate.
+ exit(0);
+ }
+}
+
+TEST(Pdfork, MissingRights) {
+ pid_t parent = getpid_();
+ int pd = -1;
+ pid_t pid = pdfork(&pd, 0);
+ EXPECT_OK(pid);
+ if (pid == 0) {
+ // Child: loop forever.
+ EXPECT_NE(parent, getpid_());
+ while (true) sleep(1);
+ }
+ // Create two capabilities from the process descriptor.
+ cap_rights_t r_ro;
+ cap_rights_init(&r_ro, CAP_READ, CAP_LOOKUP);
+ int cap_incapable = dup(pd);
+ EXPECT_OK(cap_incapable);
+ EXPECT_OK(cap_rights_limit(cap_incapable, &r_ro));
+ cap_rights_t r_pdall;
+ cap_rights_init(&r_pdall, CAP_PDGETPID, CAP_PDWAIT, CAP_PDKILL);
+ int cap_capable = dup(pd);
+ EXPECT_OK(cap_capable);
+ EXPECT_OK(cap_rights_limit(cap_capable, &r_pdall));
+
+ pid_t other_pid;
+ EXPECT_NOTCAPABLE(pdgetpid(cap_incapable, &other_pid));
+ EXPECT_NOTCAPABLE(pdkill(cap_incapable, SIGINT));
+ int status;
+ EXPECT_NOTCAPABLE(pdwait4_(cap_incapable, &status, 0, NULL));
+
+ EXPECT_OK(pdgetpid(cap_capable, &other_pid));
+ EXPECT_EQ(pid, other_pid);
+ EXPECT_OK(pdkill(cap_capable, SIGINT));
+ int rc = pdwait4_(pd, &status, 0, NULL);
+ EXPECT_OK(rc);
+ EXPECT_EQ(pid, rc);
+}
+
+
+//------------------------------------------------
+// Passing process descriptors between processes.
+
+TEST_F(PipePdfork, PassProcessDescriptor) {
+ int sock_fds[2];
+ EXPECT_OK(socketpair(AF_UNIX, SOCK_STREAM, 0, sock_fds));
+
+ struct msghdr mh;
+ mh.msg_name = NULL; // No address needed
+ mh.msg_namelen = 0;
+ char buffer1[1024];
+ struct iovec iov[1];
+ iov[0].iov_base = buffer1;
+ iov[0].iov_len = sizeof(buffer1);
+ mh.msg_iov = iov;
+ mh.msg_iovlen = 1;
+ char buffer2[1024];
+ mh.msg_control = buffer2;
+ mh.msg_controllen = sizeof(buffer2);
+ struct cmsghdr *cmptr;
+
+ if (verbose) fprintf(stderr, "[%d] about to fork()\n", getpid_());
+ pid_t child2 = fork();
+ if (child2 == 0) {
+ // Child: close our copy of the original process descriptor.
+ close(pd_);
+
+ // Child: wait to receive process descriptor over socket
+ if (verbose) fprintf(stderr, " [%d] child of %d waiting for process descriptor on socket\n", getpid_(), getppid());
+ int rc = recvmsg(sock_fds[0], &mh, 0);
+ EXPECT_OK(rc);
+ EXPECT_LE(CMSG_LEN(sizeof(int)), mh.msg_controllen);
+ cmptr = CMSG_FIRSTHDR(&mh);
+ int pd = *(int*)CMSG_DATA(cmptr);
+ EXPECT_EQ(CMSG_LEN(sizeof(int)), cmptr->cmsg_len);
+ cmptr = CMSG_NXTHDR(&mh, cmptr);
+ EXPECT_TRUE(cmptr == NULL);
+ if (verbose) fprintf(stderr, " [%d] got process descriptor %d on socket\n", getpid_(), pd);
+
+ // Child: confirm we can do pd*() operations on the process descriptor
+ pid_t other;
+ EXPECT_OK(pdgetpid(pd, &other));
+ if (verbose) fprintf(stderr, " [%d] process descriptor %d is pid %d\n", getpid_(), pd, other);
+
+ sleep(2);
+ if (verbose) fprintf(stderr, " [%d] close process descriptor %d\n", getpid_(), pd);
+ close(pd);
+
+ // Last process descriptor closed, expect death
+ EXPECT_PID_DEAD(other);
+
+ exit(HasFailure());
+ }
+ usleep(1000); // Ensure subprocess runs
+
+ // Send the process descriptor over the pipe to the sub-process
+ mh.msg_controllen = CMSG_LEN(sizeof(int));
+ cmptr = CMSG_FIRSTHDR(&mh);
+ cmptr->cmsg_level = SOL_SOCKET;
+ cmptr->cmsg_type = SCM_RIGHTS;
+ cmptr->cmsg_len = CMSG_LEN(sizeof(int));
+ *(int *)CMSG_DATA(cmptr) = pd_;
+ buffer1[0] = 0;
+ iov[0].iov_len = 1;
+ sleep(1);
+ if (verbose) fprintf(stderr, "[%d] send process descriptor %d on socket\n", getpid_(), pd_);
+ int rc = sendmsg(sock_fds[1], &mh, 0);
+ EXPECT_OK(rc);
+
+ if (verbose) fprintf(stderr, "[%d] close process descriptor %d\n", getpid_(), pd_);
+ close(pd_); // Not last open process descriptor
+
+ // wait for child2
+ int status;
+ EXPECT_EQ(child2, waitpid(child2, &status, __WALL));
+ rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
+ EXPECT_EQ(0, rc);
+
+ // confirm death all round
+ EXPECT_PID_DEAD(child2);
+ EXPECT_PID_DEAD(pid_);
+}
Index: contrib/capsicum-test/rename.cc
===================================================================
--- /dev/null
+++ contrib/capsicum-test/rename.cc
@@ -0,0 +1,49 @@
+#include <fcntl.h>
+#include <sys/stat.h>
+
+#include "./capsicum-test.h"
+
+// There was a Capsicum-related regression in FreeBSD renameat,
+// which affects certain cases independent of Capsicum or capability mode
+//
+// added to test the renameat syscall for the case that
+// - the "to" file already exists
+// - the "to" file is specified by an absolute path
+// - the "to" file descriptor is used
+// (this descriptor should be ignored if absolute path is provided)
+//
+// details at: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222258
+
+
+const char * create_tmp_src(const char* filename) {
+ const char *src_path = TmpFile(filename);
+ int src_fd = open(src_path, O_CREAT|O_RDWR, 0644);
+ close(src_fd);
+ return src_path;
+}
+
+TEST(Rename, AbsDesignationSame) {
+ const char *src_path = create_tmp_src("rename_test");
+ EXPECT_OK(rename(src_path, src_path));
+ unlink(src_path);
+}
+
+TEST(RenameAt, AbsDesignationSame) {
+ const char *src_path = create_tmp_src("renameat_test");
+ const char *dir_path = TmpFile("renameat_test_dir");
+
+ EXPECT_OK(mkdir(dir_path, 0755));
+ // random temporary directory descriptor
+ int dfd = open(dir_path, O_DIRECTORY);
+
+ // Various rename from/to the same absolute path; in each case the source
+ // and dest directory FDs should be irrelevant.
+ EXPECT_OK(renameat(AT_FDCWD, src_path, AT_FDCWD, src_path));
+ EXPECT_OK(renameat(AT_FDCWD, src_path, dfd, src_path));
+ EXPECT_OK(renameat(dfd, src_path, AT_FDCWD, src_path));
+ EXPECT_OK(renameat(dfd, src_path, dfd, src_path));
+
+ close(dfd);
+ rmdir(dir_path);
+ unlink(src_path);
+}
Index: contrib/capsicum-test/sctp.cc
===================================================================
--- /dev/null
+++ contrib/capsicum-test/sctp.cc
@@ -0,0 +1,212 @@
+// Tests of SCTP functionality
+// Requires: libsctp-dev package on Debian Linux, CONFIG_IP_SCTP in kernel config
+#ifdef HAVE_SCTP
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/sctp.h>
+#include <arpa/inet.h>
+#include <stdio.h>
+
+#include "syscalls.h"
+#include "capsicum.h"
+#include "capsicum-test.h"
+
+static cap_rights_t r_ro;
+static cap_rights_t r_wo;
+static cap_rights_t r_rw;
+static cap_rights_t r_all;
+static cap_rights_t r_all_nopeel;
+#define DO_PEELOFF 0x1A
+#define DO_TERM 0x1B
+
+static int SctpClient(int port, unsigned char byte) {
+ // Create sockets
+ int sock = socket(AF_INET, SOCK_SEQPACKET, IPPROTO_SCTP);
+ EXPECT_OK(sock);
+ if (sock < 0) return sock;
+ int cap_sock_ro = dup(sock);
+ EXPECT_OK(cap_sock_ro);
+ EXPECT_OK(cap_rights_limit(cap_sock_ro, &r_rw));
+ int cap_sock_rw = dup(sock);
+ EXPECT_OK(cap_sock_rw);
+ EXPECT_OK(cap_rights_limit(cap_sock_rw, &r_rw));
+ int cap_sock_all = dup(sock);
+ EXPECT_OK(cap_sock_all);
+ EXPECT_OK(cap_rights_limit(cap_sock_all, &r_all));
+ close(sock);
+
+ // Send a message. Requires CAP_WRITE and CAP_CONNECT.
+ struct sockaddr_in serv_addr;
+ memset(&serv_addr, 0, sizeof(serv_addr));
+ serv_addr.sin_family = AF_INET;
+ serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
+ serv_addr.sin_port = htons(port);
+
+ EXPECT_NOTCAPABLE(sctp_sendmsg(cap_sock_ro, &byte, 1,
+ (struct sockaddr*)&serv_addr, sizeof(serv_addr),
+ 0, 0, 1, 0, 0));
+ EXPECT_NOTCAPABLE(sctp_sendmsg(cap_sock_rw, &byte, 1,
+ (struct sockaddr*)&serv_addr, sizeof(serv_addr),
+ 0, 0, 1, 0, 0));
+ if (verbose) fprintf(stderr, " [%d]sctp_sendmsg(%02x)\n", getpid_(), byte);
+ EXPECT_OK(sctp_sendmsg(cap_sock_all, &byte, 1,
+ (struct sockaddr*)&serv_addr, sizeof(serv_addr),
+ 0, 0, 1, 0, 0));
+ close(cap_sock_ro);
+ close(cap_sock_rw);
+ return cap_sock_all;
+}
+
+
+TEST(Sctp, Socket) {
+ int sock = socket(AF_INET, SOCK_SEQPACKET, IPPROTO_SCTP);
+ EXPECT_OK(sock);
+ if (sock < 0) return;
+
+ cap_rights_init(&r_ro, CAP_READ);
+ cap_rights_init(&r_wo, CAP_WRITE);
+ cap_rights_init(&r_rw, CAP_READ, CAP_WRITE);
+ cap_rights_init(&r_all, CAP_READ, CAP_WRITE, CAP_SOCK_CLIENT, CAP_SOCK_SERVER);
+ cap_rights_init(&r_all_nopeel, CAP_READ, CAP_WRITE, CAP_SOCK_CLIENT, CAP_SOCK_SERVER);
+ cap_rights_clear(&r_all_nopeel, CAP_PEELOFF);
+
+ int cap_sock_wo = dup(sock);
+ EXPECT_OK(cap_sock_wo);
+ EXPECT_OK(cap_rights_limit(cap_sock_wo, &r_wo));
+ int cap_sock_rw = dup(sock);
+ EXPECT_OK(cap_sock_rw);
+ EXPECT_OK(cap_rights_limit(cap_sock_rw, &r_rw));
+ int cap_sock_all = dup(sock);
+ EXPECT_OK(cap_sock_all);
+ EXPECT_OK(cap_rights_limit(cap_sock_all, &r_all));
+ int cap_sock_all_nopeel = dup(sock);
+ EXPECT_OK(cap_sock_all_nopeel);
+ EXPECT_OK(cap_rights_limit(cap_sock_all_nopeel, &r_all_nopeel));
+ close(sock);
+
+ struct sockaddr_in addr;
+ memset(&addr, 0, sizeof(addr));
+ addr.sin_family = AF_INET;
+ addr.sin_port = htons(0);
+ addr.sin_addr.s_addr = htonl(INADDR_ANY);
+ socklen_t len = sizeof(addr);
+
+ // Can only bind the fully-capable socket.
+ EXPECT_NOTCAPABLE(bind(cap_sock_rw, (struct sockaddr *)&addr, len));
+ EXPECT_OK(bind(cap_sock_all, (struct sockaddr *)&addr, len));
+
+ EXPECT_OK(getsockname(cap_sock_all, (struct sockaddr *)&addr, &len));
+ int port = ntohs(addr.sin_port);
+
+ // Now we know the port involved, fork off children to run clients.
+ pid_t child1 = fork();
+ if (child1 == 0) {
+ // Child process 1: wait for server setup
+ sleep(1);
+ // Send a message that triggers peeloff
+ int client_sock = SctpClient(port, DO_PEELOFF);
+ sleep(1);
+ close(client_sock);
+ exit(HasFailure());
+ }
+
+ pid_t child2 = fork();
+ if (child2 == 0) {
+ // Child process 2: wait for server setup
+ sleep(2);
+ // Send a message that triggers server exit
+ int client_sock = SctpClient(port, DO_TERM);
+ close(client_sock);
+ exit(HasFailure());
+ }
+
+ // Can only listen on the fully-capable socket.
+ EXPECT_NOTCAPABLE(listen(cap_sock_rw, 3));
+ EXPECT_OK(listen(cap_sock_all, 3));
+
+ // Can only do socket operations on the fully-capable socket.
+ len = sizeof(addr);
+ EXPECT_NOTCAPABLE(getsockname(cap_sock_rw, (struct sockaddr*)&addr, &len));
+
+ struct sctp_event_subscribe events;
+ memset(&events, 0, sizeof(events));
+ events.sctp_association_event = 1;
+ events.sctp_data_io_event = 1;
+ EXPECT_NOTCAPABLE(setsockopt(cap_sock_rw, IPPROTO_SCTP, SCTP_EVENTS, &events, sizeof(events)));
+ len = sizeof(events);
+ EXPECT_NOTCAPABLE(getsockopt(cap_sock_rw, IPPROTO_SCTP, SCTP_EVENTS, &events, &len));
+ memset(&events, 0, sizeof(events));
+ events.sctp_association_event = 1;
+ events.sctp_data_io_event = 1;
+ EXPECT_OK(setsockopt(cap_sock_all, IPPROTO_SCTP, SCTP_EVENTS, &events, sizeof(events)));
+ len = sizeof(events);
+ EXPECT_OK(getsockopt(cap_sock_all, IPPROTO_SCTP, SCTP_EVENTS, &events, &len));
+
+ len = sizeof(addr);
+ memset(&addr, 0, sizeof(addr));
+ EXPECT_OK(getsockname(cap_sock_all, (struct sockaddr*)&addr, &len));
+ EXPECT_EQ(AF_INET, addr.sin_family);
+ EXPECT_EQ(htons(port), addr.sin_port);
+
+ struct sockaddr_in client_addr;
+ socklen_t addr_len = sizeof(client_addr);
+ unsigned char buffer[1024];
+ struct sctp_sndrcvinfo sri;
+ memset(&sri, 0, sizeof(sri));
+ int flags = 0;
+ EXPECT_NOTCAPABLE(sctp_recvmsg(cap_sock_wo, buffer, sizeof(buffer),
+ (struct sockaddr*)&client_addr, &addr_len,
+ &sri, &flags));
+ while (true) {
+ retry:
+ memset(&sri, 0, sizeof(sri));
+ int len = sctp_recvmsg(cap_sock_rw, buffer, sizeof(buffer),
+ (struct sockaddr*)&client_addr, &addr_len,
+ &sri, &flags);
+ if (len < 0 && errno == EAGAIN) goto retry;
+ EXPECT_OK(len);
+ if (len > 0) {
+ if (verbose) fprintf(stderr, "[%d]sctp_recvmsg(%02x..)", getpid_(), (unsigned)buffer[0]);
+ if (buffer[0] == DO_PEELOFF) {
+ if (verbose) fprintf(stderr, "..peeling off association %08lx\n", (long)sri.sinfo_assoc_id);
+ // Peel off the association. Needs CAP_PEELOFF.
+ int rc1 = sctp_peeloff(cap_sock_all_nopeel, sri.sinfo_assoc_id);
+ EXPECT_NOTCAPABLE(rc1);
+ int rc2 = sctp_peeloff(cap_sock_all, sri.sinfo_assoc_id);
+ EXPECT_OK(rc2);
+ int peeled = std::max(rc1, rc2);
+ if (peeled > 0) {
+#ifdef CAP_FROM_PEELOFF
+ // Peeled off FD should have same rights as original socket.
+ cap_rights_t rights;
+ EXPECT_OK(cap_rights_get(peeled, &rights));
+ EXPECT_RIGHTS_EQ(&r_all, &rights);
+#endif
+ close(peeled);
+ }
+ } else if (buffer[0] == DO_TERM) {
+ if (verbose) fprintf(stderr, "..terminating server\n");
+ break;
+ }
+ } else if (len < 0) {
+ break;
+ }
+ }
+
+ // Wait for the children.
+ int status;
+ int rc;
+ EXPECT_EQ(child1, waitpid(child1, &status, 0));
+ rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
+ EXPECT_EQ(0, rc);
+ EXPECT_EQ(child2, waitpid(child2, &status, 0));
+ rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
+ EXPECT_EQ(0, rc);
+
+ close(cap_sock_wo);
+ close(cap_sock_rw);
+ close(cap_sock_all);
+ close(cap_sock_all_nopeel);
+}
+#endif
Index: contrib/capsicum-test/select.cc
===================================================================
--- /dev/null
+++ contrib/capsicum-test/select.cc
@@ -0,0 +1,142 @@
+#include <sys/select.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <poll.h>
+
+#include "capsicum.h"
+#include "syscalls.h"
+#include "capsicum-test.h"
+
+namespace {
+
+int AddFDToSet(fd_set* fset, int fd, int maxfd) {
+ FD_SET(fd, fset);
+ if (fd > maxfd) maxfd = fd;
+ return maxfd;
+}
+
+int InitFDSet(fd_set* fset, int *fds, int fdcount) {
+ FD_ZERO(fset);
+ int maxfd = -1;
+ for (int ii = 0; ii < fdcount; ii++) {
+ maxfd = AddFDToSet(fset, fds[ii], maxfd);
+ }
+ return maxfd;
+}
+
+} // namespace
+
+FORK_TEST_ON(Select, LotsOFileDescriptors, TmpFile("cap_select")) {
+ int fd = open(TmpFile("cap_select"), O_RDWR | O_CREAT, 0644);
+ EXPECT_OK(fd);
+ if (fd < 0) return;
+
+ // Create many POLL_EVENT capabilities.
+ const int kCapCount = 64;
+ int cap_fd[kCapCount];
+ cap_rights_t r_poll;
+ cap_rights_init(&r_poll, CAP_EVENT);
+ for (int ii = 0; ii < kCapCount; ii++) {
+ cap_fd[ii] = dup(fd);
+ EXPECT_OK(cap_fd[ii]);
+ EXPECT_OK(cap_rights_limit(cap_fd[ii], &r_poll));
+ }
+ cap_rights_t r_rw;
+ cap_rights_init(&r_rw, CAP_READ, CAP_WRITE, CAP_SEEK);
+ int cap_rw = dup(fd);
+ EXPECT_OK(cap_rw);
+ EXPECT_OK(cap_rights_limit(cap_rw, &r_rw));
+
+ EXPECT_OK(cap_enter()); // Enter capability mode
+
+ struct timeval tv;
+ tv.tv_sec = 0;
+ tv.tv_usec = 100;
+ // Add normal file descriptor and all CAP_EVENT capabilities
+ fd_set rset;
+ fd_set wset;
+ int maxfd = InitFDSet(&rset, cap_fd, kCapCount);
+ maxfd = AddFDToSet(&rset, fd, maxfd);
+ InitFDSet(&wset, cap_fd, kCapCount);
+ AddFDToSet(&rset, fd, 0);
+ int ret = select(maxfd+1, &rset, &wset, NULL, &tv);
+ EXPECT_OK(ret);
+
+ // Now also include the capability with no CAP_EVENT.
+ InitFDSet(&rset, cap_fd, kCapCount);
+ AddFDToSet(&rset, fd, maxfd);
+ maxfd = AddFDToSet(&rset, cap_rw, maxfd);
+ InitFDSet(&wset, cap_fd, kCapCount);
+ AddFDToSet(&wset, fd, maxfd);
+ AddFDToSet(&wset, cap_rw, maxfd);
+ ret = select(maxfd+1, &rset, &wset, NULL, &tv);
+ EXPECT_NOTCAPABLE(ret);
+
+#ifdef HAVE_PSELECT
+ // And again with pselect
+ struct timespec ts;
+ ts.tv_sec = 0;
+ ts.tv_nsec = 100000;
+ maxfd = InitFDSet(&rset, cap_fd, kCapCount);
+ maxfd = AddFDToSet(&rset, fd, maxfd);
+ InitFDSet(&wset, cap_fd, kCapCount);
+ AddFDToSet(&rset, fd, 0);
+ ret = pselect(maxfd+1, &rset, &wset, NULL, &ts, NULL);
+ EXPECT_OK(ret);
+
+ InitFDSet(&rset, cap_fd, kCapCount);
+ AddFDToSet(&rset, fd, maxfd);
+ maxfd = AddFDToSet(&rset, cap_rw, maxfd);
+ InitFDSet(&wset, cap_fd, kCapCount);
+ AddFDToSet(&wset, fd, maxfd);
+ AddFDToSet(&wset, cap_rw, maxfd);
+ ret = pselect(maxfd+1, &rset, &wset, NULL, &ts, NULL);
+ EXPECT_NOTCAPABLE(ret);
+#endif
+}
+
+FORK_TEST_ON(Poll, LotsOFileDescriptors, TmpFile("cap_poll")) {
+ int fd = open(TmpFile("cap_poll"), O_RDWR | O_CREAT, 0644);
+ EXPECT_OK(fd);
+ if (fd < 0) return;
+
+ // Create many POLL_EVENT capabilities.
+ const int kCapCount = 64;
+ struct pollfd cap_fd[kCapCount + 2];
+ cap_rights_t r_poll;
+ cap_rights_init(&r_poll, CAP_EVENT);
+ for (int ii = 0; ii < kCapCount; ii++) {
+ cap_fd[ii].fd = dup(fd);
+ EXPECT_OK(cap_fd[ii].fd);
+ EXPECT_OK(cap_rights_limit(cap_fd[ii].fd, &r_poll));
+ cap_fd[ii].events = POLLIN|POLLOUT;
+ }
+ cap_fd[kCapCount].fd = fd;
+ cap_fd[kCapCount].events = POLLIN|POLLOUT;
+ cap_rights_t r_rw;
+ cap_rights_init(&r_rw, CAP_READ, CAP_WRITE, CAP_SEEK);
+ int cap_rw = dup(fd);
+ EXPECT_OK(cap_rw);
+ EXPECT_OK(cap_rights_limit(cap_rw, &r_rw));
+ cap_fd[kCapCount + 1].fd = cap_rw;
+ cap_fd[kCapCount + 1].events = POLLIN|POLLOUT;
+
+ EXPECT_OK(cap_enter()); // Enter capability mode
+
+ EXPECT_OK(poll(cap_fd, kCapCount + 1, 10));
+ // Now also include the capability with no CAP_EVENT.
+ EXPECT_OK(poll(cap_fd, kCapCount + 2, 10));
+ EXPECT_NE(0, (cap_fd[kCapCount + 1].revents & POLLNVAL));
+
+#ifdef HAVE_PPOLL
+ // And again with ppoll
+ struct timespec ts;
+ ts.tv_sec = 0;
+ ts.tv_nsec = 100000;
+ EXPECT_OK(ppoll(cap_fd, kCapCount + 1, &ts, NULL));
+ // Now also include the capability with no CAP_EVENT.
+ EXPECT_OK(ppoll(cap_fd, kCapCount + 2, &ts, NULL));
+ EXPECT_NE(0, (cap_fd[kCapCount + 1].revents & POLLNVAL));
+#endif
+}
Index: contrib/capsicum-test/showrights
===================================================================
--- /dev/null
+++ contrib/capsicum-test/showrights
@@ -0,0 +1,99 @@
+#!/usr/bin/env python
+import sys
+import re
+
+_values = { # 2-tuple => name
+ (0x0000000000000000, 0x0000000000000100) : 'TTYHOOK',
+ (0x0000000000000040, 0x0000000000000000) : 'CREATE',
+ (0x0000000200000000, 0x0000000000000000) : 'GETSOCKNAME',
+ (0x0000000000000000, 0x0000000000100000) : 'KQUEUE_CHANGE',
+ (0x0000000000000000, 0x0000000000004000) : 'EXTATTR_LIST',
+ (0x0000000000000080, 0x0000000000000000) : 'FEXECVE',
+ (0x0000001000000000, 0x0000000000000000) : 'PEELOFF',
+ (0x0000000000000000, 0x0000000000800000) : 'NOTIFY',
+ (0x0000000000000000, 0x0000000000001000) : 'EXTATTR_DELETE',
+ (0x0000000040000000, 0x0000000000000000) : 'BIND',
+ (0x0000000000000000, 0x0000000000002000) : 'EXTATTR_GET',
+ (0x0000000000008000, 0x0000000000000000) : 'FCNTL',
+ (0x0000000000000000, 0x0000000000400000) : 'EPOLL_CTL',
+ (0x0000000000000004, 0x0000000000000000) : 'SEEK_TELL',
+ (0x000000000000000c, 0x0000000000000000) : 'SEEK',
+ (0x0000004000000000, 0x0000000000000000) : 'SHUTDOWN',
+ (0x0000000000000000, 0x0000000000000080) : 'IOCTL',
+ (0x0000000000000000, 0x0000000000000020) : 'EVENT',
+ (0x0000000400000000, 0x0000000000000000) : 'GETSOCKOPT',
+ (0x0000000080000000, 0x0000000000000000) : 'CONNECT',
+ (0x0000000000000000, 0x0000000000200000) : 'FSIGNAL',
+ (0x0000000000000000, 0x0000000000008000) : 'EXTATTR_SET',
+ (0x0000000000100000, 0x0000000000000000) : 'FSTATFS',
+ (0x0000000000040000, 0x0000000000000000) : 'FSCK',
+ (0x0000000000000000, 0x0000000000000800) : 'PDKILL_FREEBSD',
+ (0x0000000000000000, 0x0000000000000004) : 'SEM_GETVALUE',
+ (0x0000000000000000, 0x0000000000080000) : 'ACL_SET',
+ (0x0000000000200000, 0x0000000000000000) : 'FUTIMES',
+ (0x0000000000000200, 0x0000000000000000) : 'FTRUNCATE',
+ (0x0000000000000000, 0x0000000000000001) : 'MAC_GET',
+ (0x0000000000020000, 0x0000000000000000) : 'FPATHCONF',
+ (0x0000002000000000, 0x0000000000000000) : 'SETSOCKOPT',
+ (0x0000000000002000, 0x0000000000000000) : 'FCHMOD',
+ (0x0000000000000000, 0x0000000002000000) : 'PERFMON',
+ (0x0000000000004000, 0x0000000000000000) : 'FCHOWN',
+ (0x0000000000000400, 0x0000000000000000) : 'LOOKUP',
+ (0x0000000000400400, 0x0000000000000000) : 'LINKAT_TARGET',
+ (0x0000000000800400, 0x0000000000000000) : 'MKDIRAT',
+ (0x0000000001000400, 0x0000000000000000) : 'MKFIFOAT',
+ (0x0000000002000400, 0x0000000000000000) : 'MKNODAT',
+ (0x0000000004000400, 0x0000000000000000) : 'RENAMEAT_SOURCE',
+ (0x0000000008000400, 0x0000000000000000) : 'SYMLINKAT',
+ (0x0000000010000400, 0x0000000000000000) : 'UNLINKAT',
+ (0x0000008000000400, 0x0000000000000000) : 'BINDAT',
+ (0x0000010000000400, 0x0000000000000000) : 'CONNECTAT',
+ (0x0000020000000400, 0x0000000000000000) : 'LINKAT_SOURCE',
+ (0x0000040000000400, 0x0000000000000000) : 'RENAMEAT_TARGET',
+ (0x0000000000000010, 0x0000000000000000) : 'MMAP',
+ (0x000000000000003c, 0x0000000000000000) : 'MMAP_X',
+ (0x0000000000000000, 0x0000000001000000) : 'SETNS',
+ (0x0000000000080000, 0x0000000000000000) : 'FSTAT',
+ (0x0000000000000001, 0x0000000000000000) : 'READ',
+ (0x0000000000000000, 0x0000000000000008) : 'SEM_POST',
+ (0x0000000000000000, 0x0000000000020000) : 'ACL_DELETE',
+ (0x0000000000001000, 0x0000000000000000) : 'FCHFLAGS',
+ (0x0000000800000000, 0x0000000000000000) : 'LISTEN',
+ (0x0000000100000000, 0x0000000000000000) : 'GETPEERNAME',
+ (0x0000000000000100, 0x0000000000000000) : 'FSYNC',
+ (0x0000000000000000, 0x0000000004000000) : 'BPF',
+ (0x0000000020000000, 0x0000000000000000) : 'ACCEPT',
+ (0x0000000000000800, 0x0000000000000000) : 'FCHDIR',
+ (0x0000000000000002, 0x0000000000000000) : 'WRITE',
+ (0x0000000000000000, 0x0000000000000010) : 'SEM_WAIT',
+ (0x0000000000000000, 0x0000000000000040) : 'KQUEUE_EVENT',
+ (0x0000000000000000, 0x0000000000000400) : 'PDWAIT',
+ (0x0000000000000000, 0x0000000000040000) : 'ACL_GET',
+ (0x0000000000010000, 0x0000000000000000) : 'FLOCK',
+ (0x0000000000000000, 0x0000000000010000) : 'ACL_CHECK',
+ (0x0000000000000000, 0x0000000000000002) : 'MAC_SET',
+ (0x0000000000000000, 0x0000000000000200) : 'PDGETPID_FREEBSD',
+}
+
+
+def _map_fdinfo(line):
+ RIGHTS_RE = re.compile(r'(?P<prefix>.*)rights:(?P<ws>\s+)0x(?P<v0>[0-9a-fA-F]+)\s+0x(?P<v1>[0-9a-fA-F]+)$')
+ m = RIGHTS_RE.match(line)
+ if m:
+ val0 = long(m.group('v0'), 16)
+ val0 = (val0 & ~(0x0200000000000000L))
+ val1 = long(m.group('v1'), 16)
+ val1 = (val1 & ~(0x0400000000000000L))
+ rights = []
+ for (right, name) in _values.items():
+ if ((right[0] == 0 or (val0 & right[0])) and
+ (right[1] == 0 or (val1 & right[1]))):
+ rights.append(name)
+ return "%srights:%s%s" % (m.group('prefix'), m.group('ws'), '|'.join(rights))
+ else:
+ return line.rstrip()
+
+if __name__ == "__main__":
+ infile = open(sys.argv[1], 'r') if len(sys.argv) > 1 else sys.stdin
+ for line in infile.readlines():
+ print _map_fdinfo(line)
Index: contrib/capsicum-test/smoketest.c
===================================================================
--- /dev/null
+++ contrib/capsicum-test/smoketest.c
@@ -0,0 +1,135 @@
+/* Small standalone test program to check the existence of Capsicum syscalls */
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <signal.h>
+
+#include "capsicum.h"
+
+#ifdef __linux__
+// glibc on Linux caches getpid() return value.
+int getpid_(void) { return syscall(__NR_getpid); }
+#else
+#define getpid_ getpid
+#endif
+
+static int seen_sigchld = 0;
+static void handle_signal(int x) {
+ fprintf(stderr, "[%d] received SIGCHLD\n", getpid_());
+ seen_sigchld = 1;
+}
+
+int main(int argc, char *argv[]) {
+ signal(SIGCHLD, handle_signal);
+ int lifetime = 4; /* seconds */
+ if (1 < argc) {
+ lifetime = atoi(argv[1]);
+ }
+
+ /* cap_rights_limit() available? */
+ cap_rights_t r_rws;
+ cap_rights_init(&r_rws, CAP_READ, CAP_WRITE, CAP_SEEK);
+ int cap_fd = dup(STDOUT_FILENO);
+ int rc = cap_rights_limit(cap_fd, &r_rws);
+ fprintf(stderr, "[%d] cap_fd=%d\n", getpid_(), cap_fd);
+ if (rc < 0) fprintf(stderr, "*** cap_rights_limit() failed: errno=%d %s\n", errno, strerror(errno));
+
+ /* cap_rights_get() available? */
+ cap_rights_t rights;
+ cap_rights_init(&rights, 0);
+ rc = cap_rights_get(cap_fd, &rights);
+ char buffer[256];
+ cap_rights_describe(&rights, buffer);
+ fprintf(stderr, "[%d] cap_rights_get(cap_fd=%d) rc=%d rights=%s\n", getpid_(), cap_fd, rc, buffer);
+ if (rc < 0) fprintf(stderr, "*** cap_rights_get() failed: errno=%d %s\n", errno, strerror(errno));
+
+ /* fstat() policed? */
+ struct stat buf;
+ rc = fstat(cap_fd, &buf);
+ fprintf(stderr, "[%d] fstat(cap_fd=%d) rc=%d errno=%d\n", getpid_(), cap_fd, rc, errno);
+ if (rc != -1) fprintf(stderr, "*** fstat() unexpectedly succeeded\n");
+
+ /* pdfork() available? */
+ int pd = -1;
+ rc = pdfork(&pd, 0);
+ if (rc < 0) fprintf(stderr, "*** pdfork() failed: errno=%d %s\n", errno, strerror(errno));
+
+ if (rc == 0) { /* child */
+ int count = 0;
+ while (count < 20) {
+ fprintf(stderr, " [%d] child alive, parent is ppid=%d\n", getpid_(), getppid());
+ sleep(1);
+ }
+ fprintf(stderr, " [%d] child exit(0)\n", getpid_());
+ exit(0);
+ }
+ fprintf(stderr, "[%d] pdfork() rc=%d pd=%d\n", getpid_(), rc, pd);
+
+ /* pdgetpid() available? */
+ pid_t actual_pid = rc;
+ pid_t got_pid = -1;
+ rc = pdgetpid(pd, &got_pid);
+ if (rc < 0) fprintf(stderr, "*** pdgetpid(pd=%d) failed: errno=%d %s\n", pd, errno, strerror(errno));
+ fprintf(stderr, "[%d] pdgetpid(pd=%d)=%d, pdfork returned %d\n", getpid_(), pd, got_pid, actual_pid);
+
+ sleep(lifetime);
+
+ /* pdkill() available? */
+ rc = pdkill(pd, SIGKILL);
+ fprintf(stderr, "[%d] pdkill(pd=%d, SIGKILL) -> rc=%d\n", getpid_(), pd, rc);
+ if (rc < 0) fprintf(stderr, "*** pdkill() failed: errno=%d %s\n", errno, strerror(errno));
+ usleep(50000); /* Allow time for death and signals */
+
+ /* Death of a pdforked child should be invisible */
+ if (seen_sigchld) fprintf(stderr, "*** SIGCHLD emitted\n");
+ int status;
+ rc = wait4(-1, &status, WNOHANG, NULL);
+ if (rc > 0) fprintf(stderr, "*** wait4(-1, ...) unexpectedly found child %d\n", rc);
+
+ fprintf(stderr, "[%d] forking off a child process to check cap_enter()\n", getpid_());
+ pid_t child = fork();
+ if (child == 0) { /* child */
+ /* cap_getmode() / cap_enter() available? */
+ unsigned int cap_mode = -1;
+ rc = cap_getmode(&cap_mode);
+ fprintf(stderr, " [%d] cap_getmode() -> rc=%d, cap_mode=%d\n", getpid_(), rc, cap_mode);
+ if (rc < 0) fprintf(stderr, "*** cap_getmode() failed: errno=%d %s\n", errno, strerror(errno));
+
+ rc = cap_enter();
+ fprintf(stderr, " [%d] cap_enter() -> rc=%d\n", getpid_(), rc);
+ if (rc < 0) fprintf(stderr, "*** cap_enter() failed: errno=%d %s\n", errno, strerror(errno));
+
+ rc = cap_getmode(&cap_mode);
+ fprintf(stderr, " [%d] cap_getmode() -> rc=%d, cap_mode=%d\n", getpid_(), rc, cap_mode);
+ if (rc < 0) fprintf(stderr, "*** cap_getmode() failed: errno=%d %s\n", errno, strerror(errno));
+
+ /* open disallowed? */
+ rc = open("/etc/passwd", O_RDONLY);
+ fprintf(stderr, " [%d] open('/etc/passwd') -> rc=%d, errno=%d\n", getpid_(), rc, errno);
+ if (rc != -1) fprintf(stderr, "*** open() unexpectedly succeeded\n");
+#ifdef ECAPMODE
+ if (errno != ECAPMODE) fprintf(stderr, "*** open() failed with errno %d not ECAPMODE\n", errno);
+#endif
+ exit(0);
+ }
+ rc = wait4(child, &status, 0, NULL);
+ fprintf(stderr, "[%d] child %d exited with status %x\n", getpid_(), child, status);
+
+ /* fexecve() available? */
+ char* argv_pass[] = {(char*)"/bin/ls", "-l", "smoketest", NULL};
+ char* null_envp[] = {NULL};
+ int ls_bin = open("/bin/ls", O_RDONLY);
+ fprintf(stderr, "[%d] about to fexecve('/bin/ls', '-l', 'smoketest')\n", getpid_());
+ rc = fexecve(ls_bin, argv_pass, null_envp);
+ /* should never reach here */
+ fprintf(stderr, "*** fexecve(fd=%d) failed: rc=%d errno=%d %s\n", ls_bin, rc, errno, strerror(errno));
+
+ return 0;
+}
Index: contrib/capsicum-test/socket.cc
===================================================================
--- /dev/null
+++ contrib/capsicum-test/socket.cc
@@ -0,0 +1,340 @@
+// Tests for socket functionality.
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+
+#include <string>
+
+#include "capsicum.h"
+#include "syscalls.h"
+#include "capsicum-test.h"
+
+TEST(Socket, UnixDomain) {
+ const char* socketName = TmpFile("capsicum-test.socket");
+ unlink(socketName);
+ cap_rights_t r_rw;
+ cap_rights_init(&r_rw, CAP_READ, CAP_WRITE);
+ cap_rights_t r_all;
+ cap_rights_init(&r_all, CAP_READ, CAP_WRITE, CAP_SOCK_CLIENT, CAP_SOCK_SERVER);
+
+ pid_t child = fork();
+ if (child == 0) {
+ // Child process: wait for server setup
+ sleep(1);
+
+ // Create sockets
+ int sock = socket(AF_UNIX, SOCK_STREAM, 0);
+ EXPECT_OK(sock);
+ if (sock < 0) return;
+
+ int cap_sock_rw = dup(sock);
+ EXPECT_OK(cap_sock_rw);
+ EXPECT_OK(cap_rights_limit(cap_sock_rw, &r_rw));
+ int cap_sock_all = dup(sock);
+ EXPECT_OK(cap_sock_all);
+ EXPECT_OK(cap_rights_limit(cap_sock_all, &r_all));
+ EXPECT_OK(close(sock));
+
+ // Connect socket
+ struct sockaddr_un un;
+ memset(&un, 0, sizeof(un));
+ un.sun_family = AF_UNIX;
+ strcpy(un.sun_path, socketName);
+ socklen_t len = sizeof(un);
+ EXPECT_NOTCAPABLE(connect_(cap_sock_rw, (struct sockaddr *)&un, len));
+ EXPECT_OK(connect_(cap_sock_all, (struct sockaddr *)&un, len));
+
+ exit(HasFailure());
+ }
+
+ int sock = socket(AF_UNIX, SOCK_STREAM, 0);
+ EXPECT_OK(sock);
+ if (sock < 0) return;
+
+ int cap_sock_rw = dup(sock);
+ EXPECT_OK(cap_sock_rw);
+ EXPECT_OK(cap_rights_limit(cap_sock_rw, &r_rw));
+ int cap_sock_all = dup(sock);
+ EXPECT_OK(cap_sock_all);
+ EXPECT_OK(cap_rights_limit(cap_sock_all, &r_all));
+ EXPECT_OK(close(sock));
+
+ struct sockaddr_un un;
+ memset(&un, 0, sizeof(un));
+ un.sun_family = AF_UNIX;
+ strcpy(un.sun_path, socketName);
+ socklen_t len = (sizeof(un) - sizeof(un.sun_path) + strlen(un.sun_path));
+
+ // Can only bind the fully-capable socket.
+ EXPECT_NOTCAPABLE(bind_(cap_sock_rw, (struct sockaddr *)&un, len));
+ EXPECT_OK(bind_(cap_sock_all, (struct sockaddr *)&un, len));
+
+ // Can only listen on the fully-capable socket.
+ EXPECT_NOTCAPABLE(listen(cap_sock_rw, 3));
+ EXPECT_OK(listen(cap_sock_all, 3));
+
+ // Can only do socket operations on the fully-capable socket.
+ len = sizeof(un);
+ EXPECT_NOTCAPABLE(getsockname(cap_sock_rw, (struct sockaddr*)&un, &len));
+ int value = 0;
+ EXPECT_NOTCAPABLE(setsockopt(cap_sock_rw, SOL_SOCKET, SO_DEBUG, &value, sizeof(value)));
+ len = sizeof(value);
+ EXPECT_NOTCAPABLE(getsockopt(cap_sock_rw, SOL_SOCKET, SO_DEBUG, &value, &len));
+
+ len = sizeof(un);
+ memset(&un, 0, sizeof(un));
+ EXPECT_OK(getsockname(cap_sock_all, (struct sockaddr*)&un, &len));
+ EXPECT_EQ(AF_UNIX, un.sun_family);
+ EXPECT_EQ(std::string(socketName), std::string(un.sun_path));
+ value = 0;
+ EXPECT_OK(setsockopt(cap_sock_all, SOL_SOCKET, SO_DEBUG, &value, sizeof(value)));
+ len = sizeof(value);
+ EXPECT_OK(getsockopt(cap_sock_all, SOL_SOCKET, SO_DEBUG, &value, &len));
+
+ // Accept the incoming connection
+ len = sizeof(un);
+ memset(&un, 0, sizeof(un));
+ EXPECT_NOTCAPABLE(accept(cap_sock_rw, (struct sockaddr *)&un, &len));
+ int conn_fd = accept(cap_sock_all, (struct sockaddr *)&un, &len);
+ EXPECT_OK(conn_fd);
+
+#ifdef CAP_FROM_ACCEPT
+ // New connection should also be a capability.
+ cap_rights_t rights;
+ cap_rights_init(&rights, 0);
+ EXPECT_OK(cap_rights_get(conn_fd, &rights));
+ EXPECT_RIGHTS_IN(&rights, &r_all);
+#endif
+
+ // Wait for the child.
+ int status;
+ EXPECT_EQ(child, waitpid(child, &status, 0));
+ int rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
+ EXPECT_EQ(0, rc);
+
+ close(conn_fd);
+ close(cap_sock_rw);
+ close(cap_sock_all);
+ unlink(socketName);
+}
+
+TEST(Socket, TCP) {
+ int sock = socket(AF_INET, SOCK_STREAM, 0);
+ EXPECT_OK(sock);
+ if (sock < 0) return;
+
+ cap_rights_t r_rw;
+ cap_rights_init(&r_rw, CAP_READ, CAP_WRITE);
+ cap_rights_t r_all;
+ cap_rights_init(&r_all, CAP_READ, CAP_WRITE, CAP_SOCK_CLIENT, CAP_SOCK_SERVER);
+
+ int cap_sock_rw = dup(sock);
+ EXPECT_OK(cap_sock_rw);
+ EXPECT_OK(cap_rights_limit(cap_sock_rw, &r_rw));
+ int cap_sock_all = dup(sock);
+ EXPECT_OK(cap_sock_all);
+ EXPECT_OK(cap_rights_limit(cap_sock_all, &r_all));
+ close(sock);
+
+ struct sockaddr_in addr;
+ memset(&addr, 0, sizeof(addr));
+ addr.sin_family = AF_INET;
+ addr.sin_port = htons(0);
+ addr.sin_addr.s_addr = htonl(INADDR_ANY);
+ socklen_t len = sizeof(addr);
+
+ // Can only bind the fully-capable socket.
+ EXPECT_NOTCAPABLE(bind_(cap_sock_rw, (struct sockaddr *)&addr, len));
+ EXPECT_OK(bind_(cap_sock_all, (struct sockaddr *)&addr, len));
+
+ getsockname(cap_sock_all, (struct sockaddr *)&addr, &len);
+ int port = ntohs(addr.sin_port);
+
+ // Now we know the port involved, fork off a child.
+ pid_t child = fork();
+ if (child == 0) {
+ // Child process: wait for server setup
+ sleep(1);
+
+ // Create sockets
+ int sock = socket(AF_INET, SOCK_STREAM, 0);
+ EXPECT_OK(sock);
+ if (sock < 0) return;
+ int cap_sock_rw = dup(sock);
+ EXPECT_OK(cap_sock_rw);
+ EXPECT_OK(cap_rights_limit(cap_sock_rw, &r_rw));
+ int cap_sock_all = dup(sock);
+ EXPECT_OK(cap_sock_all);
+ EXPECT_OK(cap_rights_limit(cap_sock_all, &r_all));
+ close(sock);
+
+ // Connect socket
+ struct sockaddr_in addr;
+ memset(&addr, 0, sizeof(addr));
+ addr.sin_family = AF_INET;
+ addr.sin_port = htons(port); // Pick unused port
+ addr.sin_addr.s_addr = inet_addr("127.0.0.1");
+ socklen_t len = sizeof(addr);
+ EXPECT_NOTCAPABLE(connect_(cap_sock_rw, (struct sockaddr *)&addr, len));
+ EXPECT_OK(connect_(cap_sock_all, (struct sockaddr *)&addr, len));
+
+ exit(HasFailure());
+ }
+
+ // Can only listen on the fully-capable socket.
+ EXPECT_NOTCAPABLE(listen(cap_sock_rw, 3));
+ EXPECT_OK(listen(cap_sock_all, 3));
+
+ // Can only do socket operations on the fully-capable socket.
+ len = sizeof(addr);
+ EXPECT_NOTCAPABLE(getsockname(cap_sock_rw, (struct sockaddr*)&addr, &len));
+ int value = 1;
+ EXPECT_NOTCAPABLE(setsockopt(cap_sock_rw, SOL_SOCKET, SO_REUSEPORT, &value, sizeof(value)));
+ len = sizeof(value);
+ EXPECT_NOTCAPABLE(getsockopt(cap_sock_rw, SOL_SOCKET, SO_REUSEPORT, &value, &len));
+
+ len = sizeof(addr);
+ memset(&addr, 0, sizeof(addr));
+ EXPECT_OK(getsockname(cap_sock_all, (struct sockaddr*)&addr, &len));
+ EXPECT_EQ(AF_INET, addr.sin_family);
+ EXPECT_EQ(htons(port), addr.sin_port);
+ value = 0;
+ EXPECT_OK(setsockopt(cap_sock_all, SOL_SOCKET, SO_REUSEPORT, &value, sizeof(value)));
+ len = sizeof(value);
+ EXPECT_OK(getsockopt(cap_sock_all, SOL_SOCKET, SO_REUSEPORT, &value, &len));
+
+ // Accept the incoming connection
+ len = sizeof(addr);
+ memset(&addr, 0, sizeof(addr));
+ EXPECT_NOTCAPABLE(accept(cap_sock_rw, (struct sockaddr *)&addr, &len));
+ int conn_fd = accept(cap_sock_all, (struct sockaddr *)&addr, &len);
+ EXPECT_OK(conn_fd);
+
+#ifdef CAP_FROM_ACCEPT
+ // New connection should also be a capability.
+ cap_rights_t rights;
+ cap_rights_init(&rights, 0);
+ EXPECT_OK(cap_rights_get(conn_fd, &rights));
+ EXPECT_RIGHTS_IN(&rights, &r_all);
+#endif
+
+ // Wait for the child.
+ int status;
+ EXPECT_EQ(child, waitpid(child, &status, 0));
+ int rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
+ EXPECT_EQ(0, rc);
+
+ close(conn_fd);
+ close(cap_sock_rw);
+ close(cap_sock_all);
+}
+
+TEST(Socket, UDP) {
+ int sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+ EXPECT_OK(sock);
+ if (sock < 0) return;
+
+ cap_rights_t r_rw;
+ cap_rights_init(&r_rw, CAP_READ, CAP_WRITE);
+ cap_rights_t r_all;
+ cap_rights_init(&r_all, CAP_READ, CAP_WRITE, CAP_SOCK_CLIENT, CAP_SOCK_SERVER);
+ cap_rights_t r_connect;
+ cap_rights_init(&r_connect, CAP_READ, CAP_WRITE, CAP_CONNECT);
+
+ int cap_sock_rw = dup(sock);
+ EXPECT_OK(cap_sock_rw);
+ EXPECT_OK(cap_rights_limit(cap_sock_rw, &r_rw));
+ int cap_sock_all = dup(sock);
+ EXPECT_OK(cap_sock_all);
+ EXPECT_OK(cap_rights_limit(cap_sock_all, &r_all));
+ close(sock);
+
+ struct sockaddr_in addr;
+ memset(&addr, 0, sizeof(addr));
+ addr.sin_family = AF_INET;
+ addr.sin_port = htons(0);
+ addr.sin_addr.s_addr = htonl(INADDR_ANY);
+ socklen_t len = sizeof(addr);
+
+ // Can only bind the fully-capable socket.
+ EXPECT_NOTCAPABLE(bind_(cap_sock_rw, (struct sockaddr *)&addr, len));
+ EXPECT_OK(bind_(cap_sock_all, (struct sockaddr *)&addr, len));
+ getsockname(cap_sock_all, (struct sockaddr *)&addr, &len);
+ int port = ntohs(addr.sin_port);
+
+ // Can only do socket operations on the fully-capable socket.
+ len = sizeof(addr);
+ EXPECT_NOTCAPABLE(getsockname(cap_sock_rw, (struct sockaddr*)&addr, &len));
+ int value = 1;
+ EXPECT_NOTCAPABLE(setsockopt(cap_sock_rw, SOL_SOCKET, SO_REUSEPORT, &value, sizeof(value)));
+ len = sizeof(value);
+ EXPECT_NOTCAPABLE(getsockopt(cap_sock_rw, SOL_SOCKET, SO_REUSEPORT, &value, &len));
+
+ len = sizeof(addr);
+ memset(&addr, 0, sizeof(addr));
+ EXPECT_OK(getsockname(cap_sock_all, (struct sockaddr*)&addr, &len));
+ EXPECT_EQ(AF_INET, addr.sin_family);
+ EXPECT_EQ(htons(port), addr.sin_port);
+ value = 1;
+ EXPECT_OK(setsockopt(cap_sock_all, SOL_SOCKET, SO_REUSEPORT, &value, sizeof(value)));
+ len = sizeof(value);
+ EXPECT_OK(getsockopt(cap_sock_all, SOL_SOCKET, SO_REUSEPORT, &value, &len));
+
+ pid_t child = fork();
+ if (child == 0) {
+ int sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+ EXPECT_OK(sock);
+ int cap_sock_rw = dup(sock);
+ EXPECT_OK(cap_sock_rw);
+ EXPECT_OK(cap_rights_limit(cap_sock_rw, &r_rw));
+ int cap_sock_connect = dup(sock);
+ EXPECT_OK(cap_sock_connect);
+ EXPECT_OK(cap_rights_limit(cap_sock_connect, &r_connect));
+ close(sock);
+
+ // Can only sendmsg(2) to an address over a socket with CAP_CONNECT.
+ unsigned char buffer[256];
+ struct iovec iov;
+ memset(&iov, 0, sizeof(iov));
+ iov.iov_base = buffer;
+ iov.iov_len = sizeof(buffer);
+
+ struct msghdr mh;
+ memset(&mh, 0, sizeof(mh));
+ mh.msg_iov = &iov;
+ mh.msg_iovlen = 1;
+
+ struct sockaddr_in addr;
+ memset(&addr, 0, sizeof(addr));
+ addr.sin_family = AF_INET;
+ addr.sin_port = htons(port);
+ addr.sin_addr.s_addr = inet_addr("127.0.0.1");
+ mh.msg_name = &addr;
+ mh.msg_namelen = sizeof(addr);
+
+ EXPECT_NOTCAPABLE(sendmsg(cap_sock_rw, &mh, 0));
+ EXPECT_OK(sendmsg(cap_sock_connect, &mh, 0));
+
+#ifdef HAVE_SEND_RECV_MMSG
+ struct mmsghdr mv;
+ memset(&mv, 0, sizeof(mv));
+ memcpy(&mv.msg_hdr, &mh, sizeof(struct msghdr));
+ EXPECT_NOTCAPABLE(sendmmsg(cap_sock_rw, &mv, 1, 0));
+ EXPECT_OK(sendmmsg(cap_sock_connect, &mv, 1, 0));
+#endif
+ close(cap_sock_rw);
+ close(cap_sock_connect);
+ exit(HasFailure());
+ }
+ // Wait for the child.
+ int status;
+ EXPECT_EQ(child, waitpid(child, &status, 0));
+ int rc = WIFEXITED(status) ? WEXITSTATUS(status) : -1;
+ EXPECT_EQ(0, rc);
+
+ close(cap_sock_rw);
+ close(cap_sock_all);
+}
Index: contrib/capsicum-test/syscalls.h
===================================================================
--- /dev/null
+++ contrib/capsicum-test/syscalls.h
@@ -0,0 +1,259 @@
+/*
+ * Minimal portability layer for system call differences between
+ * Capsicum OSes.
+ */
+#ifndef __SYSCALLS_H__
+#define __SYSCALLS_H__
+
+/************************************************************
+ * FreeBSD
+ ************************************************************/
+#ifdef __FreeBSD__
+
+/* Map umount2 (Linux) syscall to unmount (FreeBSD) syscall */
+#define umount2(T, F) unmount(T, F)
+
+/* Map sighandler_y (Linux) to sig_t (FreeBSD) */
+#define sighandler_t sig_t
+
+/* profil(2) has a first argument of char* */
+#define profil_arg1_t char
+
+/* FreeBSD has getdents(2) available */
+#include <sys/types.h>
+#include <dirent.h>
+inline int getdents_(unsigned int fd, void *dirp, unsigned int count) {
+ return getdents(fd, (char*)dirp, count);
+}
+#include <sys/mman.h>
+inline int mincore_(void *addr, size_t length, unsigned char *vec) {
+ return mincore(addr, length, (char*)vec);
+}
+#define getpid_ getpid
+
+/* Map Linux-style sendfile to FreeBSD sendfile */
+#include <sys/socket.h>
+#include <sys/uio.h>
+inline ssize_t sendfile_(int out_fd, int in_fd, off_t *offset, size_t count) {
+ return sendfile(in_fd, out_fd, *offset, count, NULL, offset, 0);
+}
+
+/* A sample mount(2) call */
+#include <sys/param.h>
+#include <sys/mount.h>
+inline int bogus_mount_() {
+ return mount("procfs", "/not_mounted", 0, NULL);
+}
+
+/* Mappings for extended attribute functions */
+#include <sys/extattr.h>
+inline ssize_t flistxattr_(int fd, char *list, size_t size) {
+ return extattr_list_fd(fd, EXTATTR_NAMESPACE_USER, list, size);
+}
+inline ssize_t fgetxattr_(int fd, const char *name, void *value, size_t size) {
+ return extattr_get_fd(fd, EXTATTR_NAMESPACE_USER, name, value, size);
+}
+inline int fsetxattr_(int fd, const char *name, const void *value, size_t size, int) {
+ return extattr_set_fd(fd, EXTATTR_NAMESPACE_USER, name, value, size);
+}
+inline int fremovexattr_(int fd, const char *name) {
+ return extattr_delete_fd(fd, EXTATTR_NAMESPACE_USER, name);
+}
+
+/* mq_* functions are wrappers in FreeBSD so go through to underlying syscalls */
+#include <sys/syscall.h>
+extern "C" {
+extern int __sys_kmq_notify(int, const struct sigevent *);
+extern int __sys_kmq_open(const char *, int, mode_t, const struct mq_attr *);
+extern int __sys_kmq_setattr(int, const struct mq_attr *__restrict, struct mq_attr *__restrict);
+extern ssize_t __sys_kmq_timedreceive(int, char *__restrict, size_t,
+ unsigned *__restrict, const struct timespec *__restrict);
+extern int __sys_kmq_timedsend(int, const char *, size_t, unsigned,
+ const struct timespec *);
+extern int __sys_kmq_unlink(const char *);
+}
+#define mq_notify_ __sys_kmq_notify
+#define mq_open_ __sys_kmq_open
+#define mq_setattr_ __sys_kmq_setattr
+#define mq_getattr_(A, B) __sys_kmq_setattr(A, NULL, B)
+#define mq_timedreceive_ __sys_kmq_timedreceive
+#define mq_timedsend_ __sys_kmq_timedsend
+#define mq_unlink_ __sys_kmq_unlink
+#define mq_close_ close
+#include <sys/ptrace.h>
+inline long ptrace_(int request, pid_t pid, void *addr, void *data) {
+ return ptrace(request, pid, (caddr_t)addr, static_cast<int>((long)data));
+}
+#define PTRACE_PEEKDATA_ PT_READ_D
+#define getegid_ getegid
+#define getgid_ getgid
+#define geteuid_ geteuid
+#define getuid_ getuid
+#define getgroups_ getgroups
+#define getrlimit_ getrlimit
+#define bind_ bind
+#define connect_ connect
+
+/* Features available */
+#if __FreeBSD_version >= 1000000
+#define HAVE_CHFLAGSAT
+#define HAVE_BINDAT
+#define HAVE_CONNECTAT
+#endif
+#define HAVE_CHFLAGS
+#define HAVE_GETFSSTAT
+#define HAVE_REVOKE
+#define HAVE_GETLOGIN
+#define HAVE_MKFIFOAT
+#define HAVE_SYSARCH
+#include <machine/sysarch.h>
+#define HAVE_STAT_BIRTHTIME
+#define HAVE_SYSCTL
+#define HAVE_FPATHCONF
+#define HAVE_F_DUP2FD
+#define HAVE_PSELECT
+#define HAVE_SCTP
+
+/* FreeBSD only allows root to call mlock[all]/munlock[all] */
+#define MLOCK_REQUIRES_ROOT 1
+/* FreeBSD effectively only allows root to call sched_setscheduler */
+#define SCHED_SETSCHEDULER_REQUIRES_ROOT 1
+
+#endif /* FreeBSD */
+
+/************************************************************
+ * Linux
+ ************************************************************/
+#ifdef __linux__
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/prctl.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/wait.h>
+#include <sys/sendfile.h>
+#include <sys/statfs.h>
+#include <sys/xattr.h>
+#include <sys/mount.h>
+#include <linux/net.h>
+
+/* profil(2) has a first argument of unsigned short* */
+#define profil_arg1_t unsigned short
+
+static inline int getdents_(unsigned int fd, void *dirp, unsigned int count) {
+ return syscall(__NR_getdents, fd, dirp, count);
+}
+/* A sample mount(2) call */
+static inline int bogus_mount_() {
+ return mount("/dev/bogus", "/bogus", "debugfs", MS_RDONLY, "");
+}
+
+/* libc's getpid() wrapper caches the pid value, and doesn't invalidate
+ * the cached value on pdfork(), so directly syscall. */
+static inline pid_t getpid_() {
+ return syscall(__NR_getpid);
+}
+static inline int execveat(int fd, const char *path,
+ char *const argv[], char *const envp[], int flags) {
+ return syscall(__NR_execveat, fd, path, argv, envp, flags);
+}
+
+/*
+ * Linux glibc includes an fexecve() function, implemented via the /proc
+ * filesystem. Bypass this and go directly to the execveat(2) syscall.
+ */
+static inline int fexecve_(int fd, char *const argv[], char *const envp[]) {
+ return execveat(fd, "", argv, envp, AT_EMPTY_PATH);
+}
+/*
+ * Linux glibc attempts to be clever and intercepts various uid/gid functions.
+ * Bypass by calling the syscalls directly.
+ */
+static inline gid_t getegid_(void) { return syscall(__NR_getegid); }
+static inline gid_t getgid_(void) { return syscall(__NR_getgid); }
+static inline uid_t geteuid_(void) { return syscall(__NR_geteuid); }
+static inline uid_t getuid_(void) { return syscall(__NR_getuid); }
+static inline int getgroups_(int size, gid_t list[]) { return syscall(__NR_getgroups, size, list); }
+static inline int getrlimit_(int resource, struct rlimit *rlim) {
+ return syscall(__NR_getrlimit, resource, rlim);
+}
+
+/*
+ * Linux glibc for i386 consumes the errno returned from the raw socketcall(2) operation,
+ * so use the raw syscall for those operations that are disallowed in capability mode.
+ */
+#ifdef __NR_bind
+#define bind_ bind
+#else
+static inline int bind_(int sockfd, const struct sockaddr *addr, socklen_t addrlen) {
+ unsigned long args[3] = {(unsigned long)sockfd, (unsigned long)(intptr_t)addr, (unsigned long)addrlen};
+ return syscall(__NR_socketcall, SYS_BIND, args);
+}
+#endif
+#ifdef __NR_connect
+#define connect_ connect
+#else
+static inline int connect_(int sockfd, const struct sockaddr *addr, socklen_t addrlen) {
+ unsigned long args[3] = {(unsigned long)sockfd, (unsigned long)(intptr_t)addr, (unsigned long)addrlen};
+ return syscall(__NR_socketcall, SYS_CONNECT, args);
+}
+#endif
+
+#define mincore_ mincore
+#define sendfile_ sendfile
+#define flistxattr_ flistxattr
+#define fgetxattr_ fgetxattr
+#define fsetxattr_ fsetxattr
+#define fremovexattr_ fremovexattr
+#define mq_notify_ mq_notify
+#define mq_open_ mq_open
+#define mq_setattr_ mq_setattr
+#define mq_getattr_ mq_getattr
+#define mq_timedreceive_ mq_timedreceive
+#define mq_timedsend_ mq_timedsend
+#define mq_unlink_ mq_unlink
+#define mq_close_ mq_close
+#define ptrace_ ptrace
+#define PTRACE_PEEKDATA_ PTRACE_PEEKDATA
+
+/* Features available */
+#define HAVE_DUP3
+#define HAVE_PIPE2
+#include <sys/fsuid.h> /* for setfsgid()/setfsuid() */
+#define HAVE_SETFSUID
+#define HAVE_SETFSGID
+#define HAVE_READAHEAD
+#define HAVE_SEND_RECV_MMSG
+#define HAVE_SYNCFS
+#define HAVE_SYNC_FILE_RANGE
+#include <sys/uio.h> /* for vmsplice */
+#define HAVE_TEE
+#define HAVE_SPLICE
+#define HAVE_VMSPLICE
+#define HAVE_PSELECT
+#define HAVE_PPOLL
+#define HAVE_EXECVEAT
+#define HAVE_SYSCALL
+#define HAVE_MKNOD_REG
+#define HAVE_MKNOD_SOCKET
+/*
+ * O_BENEATH is arch-specific, via <asm/fcntl.h>; however we cannot include both that file
+ * and the normal <fcntl.h> as they have some clashing definitions. Bypass by directly
+ * defining O_BENEATH, using the current proposed x86 value. (This will therefore not
+ * work for non-x86, and may need changing in future if a different value gets merged.)
+ */
+#ifndef O_BENEATH
+#define O_BENEATH 040000000 /* no / or .. in openat path */
+#endif
+
+
+/* Linux allows anyone to call mlock[all]/munlock[all] */
+#define MLOCK_REQUIRES_ROOT 0
+/* Linux allows anyone to call sched_setscheduler */
+#define SCHED_SETSCHEDULER_REQUIRES_ROOT 1
+
+#endif /* Linux */
+
+#endif /*__SYSCALLS_H__*/
Index: contrib/capsicum-test/sysctl.cc
===================================================================
--- /dev/null
+++ contrib/capsicum-test/sysctl.cc
@@ -0,0 +1,15 @@
+#include "capsicum.h"
+#include "capsicum-test.h"
+
+#ifdef HAVE_SYSCTL
+#include <sys/sysctl.h>
+
+// Certain sysctls are permitted in capability mode, but most are not. Test
+// for the ones that should be, and try one or two that shouldn't.
+TEST(Sysctl, Capability) {
+ int oid[2] = {CTL_KERN, KERN_OSRELDATE};
+ int ii;
+ size_t len = sizeof(ii);
+ EXPECT_OK(sysctl(oid, 2, &ii, &len, NULL, 0));
+}
+#endif
Index: contrib/capsicum-test/waittest.c
===================================================================
--- /dev/null
+++ contrib/capsicum-test/waittest.c
@@ -0,0 +1,42 @@
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#ifdef __FreeBSD__
+#include <sys/procdesc.h>
+#endif
+
+#ifdef __linux__
+#include <sys/syscall.h>
+int pdfork(int *fd, int flags) {
+ return syscall(__NR_pdfork, fd, flags);
+}
+#endif
+
+int main() {
+ int procfd;
+ int rc = pdfork(&procfd, 0);
+ if (rc < 0) {
+ fprintf(stderr, "pdfork() failed rc=%d errno=%d %s\n", rc, errno, strerror(errno));
+ exit(1);
+ }
+ if (rc == 0) { // Child process
+ sleep(1);
+ exit(123);
+ }
+ fprintf(stderr, "pdfork()ed child pid=%ld procfd=%d\n", (long)rc, procfd);
+ sleep(2); // Allow child to complete
+ pid_t child = waitpid(-1, &rc, WNOHANG);
+ if (child == 0) {
+ fprintf(stderr, "waitpid(): no completed child found\n");
+ } else if (child < 0) {
+ fprintf(stderr, "waitpid(): failed errno=%d %s\n", errno, strerror(errno));
+ } else {
+ fprintf(stderr, "waitpid(): found completed child %ld\n", (long)child);
+ }
+ return 0;
+}
Index: tests/sys/capsicum/Makefile
===================================================================
--- tests/sys/capsicum/Makefile
+++ tests/sys/capsicum/Makefile
@@ -1,5 +1,7 @@
# $FreeBSD$
+.include <src.opts.mk>
+
TESTSDIR= ${TESTSBASE}/sys/capsicum
ATF_TESTS_C+= bindat_connectat
@@ -7,6 +9,49 @@
CFLAGS+= -I${SRCTOP}/tests
+.if ${MK_GOOGLETEST} != no
+
+.PATH: ${SRCTOP}/contrib/capsicum-test
+
+GTESTS+= capsicum-test
+
+SRCS.capsicum-test+= \
+ capsicum-test-main.cc \
+ capsicum-test.cc \
+ capability-fd.cc \
+ fexecve.cc \
+ procdesc.cc \
+ capmode.cc \
+ fcntl.cc \
+ ioctl.cc \
+ openat.cc \
+ sysctl.cc \
+ select.cc \
+ mqueue.cc \
+ socket.cc \
+ sctp.cc \
+ capability-fd-pair.cc \
+ overhead.cc \
+ rename.cc
+
+LIBADD.capsicum-test+= gtest pthread
+TEST_METADATA.capsicum-test= required_user="unprivileged"
+
+.for p in mini-me mini-me.noexec mini-me.setuid
+PROGS+= $p
+NO_SHARED.$p=
+SRCS.$p= mini-me.c
+.endfor
+
+BINDIR= ${TESTSDIR}
+
+BINMODE.mini-me.noexec= ${NOBINMODE}
+BINMODE.mini-me.setuid= 4555
+
+WARNS.capsicum-test= 3
+
+.endif
+
WARNS?= 6
.include <bsd.test.mk>

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