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usr.sbin/rpc.tlsservd/rpc.tlscommon.c

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2021 Rick Macklem
*
* 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.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/queue.h>
#include <sys/syslog.h>
#include <sys/select.h>
#include <sys/time.h>
#include <netdb.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <string.h>
#include <rpc/rpc.h>
#include <openssl/opensslconf.h>
#include <openssl/bio.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/x509v3.h>
#include "rpc.tlscommon.h"
/*
* How long to delay a reload of the CRL when there are RPC request(s)
* to process, in usec. Must be less than 1second.
*/
#define RELOADDELAY 250000
void
rpctls_svc_run(void)
{
int ret;
struct timeval tv;
fd_set readfds;
uint64_t curtime, nexttime;
struct timespec tp;
sigset_t sighup_mask;
/* Expand svc_run() here so that we can call rpctls_loadcrlfile(). */
curtime = nexttime = 0;
sigemptyset(&sighup_mask);
sigaddset(&sighup_mask, SIGHUP);
for (;;) {
clock_gettime(CLOCK_MONOTONIC, &tp);
curtime = tp.tv_sec;
curtime = curtime * 1000000 + tp.tv_nsec / 1000;
sigprocmask(SIG_BLOCK, &sighup_mask, NULL);
if (rpctls_gothup && curtime >= nexttime) {
rpctls_gothup = false;
sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
ret = rpctls_loadcrlfile(rpctls_ctx);
if (ret != 0)
rpctls_checkcrl();
else
rpctls_verbose_out("rpc.tlsservd: Can't "
"reload CRLfile\n");
clock_gettime(CLOCK_MONOTONIC, &tp);
nexttime = tp.tv_sec;
nexttime = nexttime * 1000000 + tp.tv_nsec / 1000 +
RELOADDELAY;
} else
sigprocmask(SIG_UNBLOCK, &sighup_mask, NULL);
/*
* If a reload is pending, poll for received request(s),
* otherwise set a RELOADDELAY timeout, since a SIGHUP
* could be processed between the got_sighup test and
* the select() system call.
*/
tv.tv_sec = 0;
if (rpctls_gothup)
tv.tv_usec = 0;
else
tv.tv_usec = RELOADDELAY;
readfds = svc_fdset;
switch (select(svc_maxfd + 1, &readfds, NULL, NULL, &tv)) {
case -1:
if (errno == EINTR) {
/* Allow a reload now. */
nexttime = 0;
continue;
}
syslog(LOG_ERR, "rpc.tls daemon died: select: %m");
exit(1);
case 0:
/* Allow a reload now. */
nexttime = 0;
continue;
default:
svc_getreqset(&readfds);
}
}
}
/*
* (re)load the CRLfile into the certificate verification store.
*/
int
rpctls_loadcrlfile(SSL_CTX *ctx)
{
X509_STORE *certstore;
X509_LOOKUP *certlookup;
int ret;
if ((rpctls_verify_cafile != NULL ||
rpctls_verify_capath != NULL) &&
rpctls_crlfile != NULL) {
certstore = SSL_CTX_get_cert_store(ctx);
certlookup = X509_STORE_add_lookup(
certstore, X509_LOOKUP_file());
ret = 0;
if (certlookup != NULL)
ret = X509_load_crl_file(certlookup,
rpctls_crlfile, X509_FILETYPE_PEM);
if (ret != 0)
ret = X509_STORE_set_flags(certstore,
X509_V_FLAG_CRL_CHECK |
X509_V_FLAG_CRL_CHECK_ALL);
if (ret == 0) {
rpctls_verbose_out(
"rpctls_loadcrlfile: Can't"
" load CRLfile=%s\n",
rpctls_crlfile);
return (ret);
}
}
return (1);
}
/*
* Read the CRL file and check for any extant connections
* that might now be revoked.
*/
void
rpctls_checkcrl(void)
{
struct ssl_entry *slp;
BIO *infile;
X509_CRL *crl;
X509_REVOKED *revoked;
char *cp, *cp2, nullstr[1];
int ret;
if (rpctls_crlfile == NULL || (rpctls_verify_cafile == NULL &&
rpctls_verify_capath == NULL))
return;
infile = BIO_new(BIO_s_file());
if (infile == NULL) {
rpctls_verbose_out("rpctls_checkcrl: Cannot BIO_new\n");
return;
}
ret = BIO_read_filename(infile, rpctls_crlfile);
if (ret != 1) {
rpctls_verbose_out("rpctls_checkcrl: Cannot read CRL file\n");
BIO_free(infile);
return;
}
nullstr[0] = '\0';
for (crl = PEM_read_bio_X509_CRL(infile, NULL, NULL, nullstr);
crl != NULL; crl = PEM_read_bio_X509_CRL(infile, NULL, NULL,
nullstr)) {
LIST_FOREACH(slp, &rpctls_ssllist, next) {
if (slp->cert != NULL) {
ret = X509_CRL_get0_by_cert(crl, &revoked,
slp->cert);
/*
* Do a shutdown on the socket, so that it
* can no longer be used. The kernel RPC
* code will notice the socket is disabled
* and will do a disconnect upcall, which will
* close the socket.
*/
if (ret == 1) {
cp2 = X509_NAME_oneline(
X509_get_subject_name(slp->cert),
NULL, 0);
cp = X509_NAME_oneline(
X509_get_issuer_name(slp->cert),
NULL, 0);
if (rpctls_debug_level == 0)
syslog(LOG_INFO | LOG_DAEMON,
"rpctls_daemon: Certificate"
" Revoked "
"issuerName=%s "
"subjectName=%s: "
"TCP connection closed",
cp, cp2);
else
fprintf(stderr,
"rpctls_daemon: Certificate"
" Revoked "
"issuerName=%s "
"subjectName=%s: "
"TCP connection closed",
cp, cp2);
shutdown(slp->s, SHUT_WR);
slp->shutoff = true;
}
}
}
X509_CRL_free(crl);
}
BIO_free(infile);
}
void
rpctls_verbose_out(const char *fmt, ...)
{
va_list ap;
if (rpctls_verbose) {
va_start(ap, fmt);
if (rpctls_debug_level == 0)
vsyslog(LOG_INFO | LOG_DAEMON, fmt, ap);
else
vfprintf(stderr, fmt, ap);
va_end(ap);
}
}
/*
* Check a IP address against any host address in the
* certificate. Basically getnameinfo(3) and
* X509_check_host().
*/
int
rpctls_checkhost(struct sockaddr *sad, X509 *cert, unsigned int wildcard)
{
char hostnam[NI_MAXHOST];
int ret;
if (getnameinfo((const struct sockaddr *)sad,
sad->sa_len, hostnam, sizeof(hostnam),
NULL, 0, NI_NAMEREQD) != 0)
return (0);
rpctls_verbose_out("rpctls_checkhost: DNS %s\n",
hostnam);
ret = X509_check_host(cert, hostnam, strlen(hostnam),
wildcard, NULL);
return (ret);
}
/*
* Get the peer's IP address.
*/
int
rpctls_gethost(int s, struct sockaddr *sad, char *hostip, size_t hostlen)
{
socklen_t slen;
int ret;
slen = sizeof(struct sockaddr_storage);
if (getpeername(s, sad, &slen) < 0)
return (0);
ret = 0;
if (getnameinfo((const struct sockaddr *)sad,
sad->sa_len, hostip, hostlen,
NULL, 0, NI_NUMERICHOST) == 0) {
rpctls_verbose_out("rpctls_gethost: %s\n",
hostip);
ret = 1;
}
return (ret);
}