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

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2008 Isilon Inc http://www.isilon.com/
* Authors: Doug Rabson <dfr@rabson.org>
* Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
*
* 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.
*/
/*
* Extensively modified from /usr/src/usr.sbin/gssd.c r344402 for
* the server side of kernel RPC-over-TLS by Rick Macklem.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/types.h>
#include <sys/linker.h>
#include <sys/module.h>
#include <sys/queue.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <sys/time.h>
#include <err.h>
#include <getopt.h>
#include <libutil.h>
#include <netdb.h>
#include <pwd.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <rpc/rpc.h>
#include <rpc/rpc_com.h>
#include <rpc/rpcsec_tls.h>
#include <openssl/opensslconf.h>
#include <openssl/bio.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/x509v3.h>
#include "rpctlssd.h"
#include "rpc.tlscommon.h"
#ifndef _PATH_RPCTLSSDSOCK
#define _PATH_RPCTLSSDSOCK "/var/run/rpc.tlsservd.sock"
#endif
#ifndef _PATH_CERTANDKEY
#define _PATH_CERTANDKEY "/etc/rpc.tlsservd/"
#endif
#ifndef _PATH_RPCTLSSDPID
#define _PATH_RPCTLSSDPID "/var/run/rpc.tlsservd.pid"
#endif
#ifndef _PREFERRED_CIPHERS
#define _PREFERRED_CIPHERS "AES128-GCM-SHA256"
#endif
/* Global variables also used by rpc.tlscommon.c. */
int rpctls_debug_level;
bool rpctls_verbose;
SSL_CTX *rpctls_ctx = NULL;
const char *rpctls_verify_cafile = NULL;
const char *rpctls_verify_capath = NULL;
char *rpctls_crlfile = NULL;
bool rpctls_gothup = false;
struct ssl_list rpctls_ssllist;
static struct pidfh *rpctls_pfh = NULL;
static bool rpctls_do_mutual = false;
static const char *rpctls_certdir = _PATH_CERTANDKEY;
static bool rpctls_comparehost = false;
static unsigned int rpctls_wildcard = X509_CHECK_FLAG_NO_WILDCARDS;
static uint64_t rpctls_ssl_refno = 0;
static uint64_t rpctls_ssl_sec = 0;
static uint64_t rpctls_ssl_usec = 0;
static bool rpctls_cnuser = false;
static char *rpctls_dnsname;
static const char *rpctls_cnuseroid = "1.3.6.1.4.1.2238.1.1.1";
static void rpctlssd_terminate(int);
static SSL_CTX *rpctls_setup_ssl(const char *certdir);
static SSL *rpctls_server(SSL_CTX *ctx, int s,
uint32_t *flags, uint32_t *uidp,
int *ngrps, uint32_t *gidp, X509 **certp);
static int rpctls_cnname(X509 *cert, uint32_t *uidp,
int *ngrps, uint32_t *gidp);
static char *rpctls_getdnsname(char *dnsname);
static void rpctls_huphandler(int sig __unused);
extern void rpctlssd_1(struct svc_req *rqstp, SVCXPRT *transp);
static struct option longopts[] = {
{ "certdir", required_argument, NULL, 'D' },
{ "debuglevel", no_argument, NULL, 'd' },
{ "checkhost", no_argument, NULL, 'h' },
{ "verifylocs", required_argument, NULL, 'l' },
{ "mutualverf", no_argument, NULL, 'm' },
{ "domain", required_argument, NULL, 'n' },
{ "verifydir", required_argument, NULL, 'p' },
{ "crl", required_argument, NULL, 'r' },
{ "certuser", no_argument, NULL, 'u' },
{ "verbose", no_argument, NULL, 'v' },
{ "multiwild", no_argument, NULL, 'W' },
{ "singlewild", no_argument, NULL, 'w' },
{ NULL, 0, NULL, 0 }
};
int
main(int argc, char **argv)
{
/*
* We provide an RPC service on a local-domain socket. The
* kernel rpctls code will upcall to this daemon to do the initial
* TLS handshake.
*/
struct sockaddr_un sun;
int ch, debug, fd, oldmask;
SVCXPRT *xprt;
struct timeval tm;
struct timezone tz;
char hostname[MAXHOSTNAMELEN + 2];
pid_t otherpid;
bool tls_enable;
size_t tls_enable_len;
/* Check that another rpctlssd isn't already running. */
rpctls_pfh = pidfile_open(_PATH_RPCTLSSDPID, 0600, &otherpid);
jhbUnsubmitted
Done
Inline Actions

I suspect what would be better here is to just make this be a compile error instead by removing these #ifdef's here and elsewhere and assume the KTLS API is present.

jhb: I suspect what would be better here is to just make this be a compile error instead by removing…
rmacklemAuthorUnsubmitted
Done
Inline Actions

I did it this way because the ports guys wanted it
to always build for the port.

However I agree that for src, it seems better to
just have it fail to compile.
Maintaining a slightly different version for the
port should be ok.

rmacklem: I did it this way because the ports guys wanted it to always build for the port. However I…
if (rpctls_pfh == NULL) {
if (errno == EEXIST)
errx(1, "rpctlssd already running, pid: %d.", otherpid);
warn("cannot open or create pidfile");
}
/* Check to see that the ktls is enabled. */
tls_enable_len = sizeof(tls_enable);
if (sysctlbyname("kern.ipc.tls.enable", &tls_enable, &tls_enable_len,
NULL, 0) != 0 || !tls_enable)
errx(1, "Kernel TLS not enabled");
/* Get the time when this daemon is started. */
gettimeofday(&tm, &tz);
rpctls_ssl_sec = tm.tv_sec;
rpctls_ssl_usec = tm.tv_usec;
/* Set the dns name for the server. */
rpctls_dnsname = rpctls_getdnsname(hostname);
if (rpctls_dnsname == NULL) {
strcpy(hostname, "@default.domain");
rpctls_dnsname = hostname;
}
debug = 0;
rpctls_verbose = false;
while ((ch = getopt_long(argc, argv, "D:dhl:n:mp:r:uvWw", longopts,
NULL)) != -1) {
switch (ch) {
case 'D':
rpctls_certdir = optarg;
break;
case 'd':
rpctls_debug_level++;
break;
case 'h':
rpctls_comparehost = true;
break;
case 'l':
rpctls_verify_cafile = optarg;
break;
case 'm':
rpctls_do_mutual = true;
break;
case 'n':
hostname[0] = '@';
strlcpy(&hostname[1], optarg, MAXHOSTNAMELEN + 1);
rpctls_dnsname = hostname;
break;
case 'p':
rpctls_verify_capath = optarg;
break;
case 'r':
rpctls_crlfile = optarg;
break;
case 'u':
rpctls_cnuser = true;
break;
case 'v':
rpctls_verbose = true;
break;
case 'W':
if (rpctls_wildcard != X509_CHECK_FLAG_NO_WILDCARDS)
errx(1, "options -w and -W are mutually "
"exclusive");
rpctls_wildcard = X509_CHECK_FLAG_MULTI_LABEL_WILDCARDS;
break;
case 'w':
if (rpctls_wildcard != X509_CHECK_FLAG_NO_WILDCARDS)
errx(1, "options -w and -W are mutually "
"exclusive");
rpctls_wildcard = 0;
break;
default:
fprintf(stderr, "usage: %s "
"[-D/--certdir certdir] [-d/--debuglevel] "
"[-h/--checkhost] "
"[-l/--verifylocs CAfile] [-m/--mutualverf] "
"[-n/--domain domain_name] "
"[-p/--verifydir CApath] [-r/--crl CRLfile] "
"[-u/--certuser] [-v/--verbose] [-W/--multiwild] "
"[-w/--singlewild]\n", argv[0]);
exit(1);
}
}
if (rpctls_do_mutual && rpctls_verify_cafile == NULL &&
rpctls_verify_capath == NULL)
errx(1, "-m requires the -l <CAfile> and/or "
"-p <CApath> options");
if (rpctls_comparehost && (!rpctls_do_mutual ||
(rpctls_verify_cafile == NULL && rpctls_verify_capath == NULL)))
errx(1, "-h requires the -m plus the "
"-l <CAfile> and/or -p <CApath> options");
if (!rpctls_comparehost && rpctls_wildcard !=
X509_CHECK_FLAG_NO_WILDCARDS)
errx(1, "The -w or -W options require the -h option");
if (rpctls_cnuser && (!rpctls_do_mutual ||
(rpctls_verify_cafile == NULL && rpctls_verify_capath == NULL)))
errx(1, "-u requires the -m plus the "
"-l <CAfile> and/or -p <CApath> options");
if (modfind("krpc") < 0) {
/* Not present in kernel, try loading it */
if (kldload("krpc") < 0 || modfind("krpc") < 0)
errx(1, "Kernel RPC is not available");
}
if (rpctls_debug_level == 0) {
if (daemon(0, 0) != 0)
err(1, "Can't daemonize");
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
signal(SIGHUP, SIG_IGN);
}
signal(SIGTERM, rpctlssd_terminate);
signal(SIGPIPE, SIG_IGN);
signal(SIGHUP, rpctls_huphandler);
pidfile_write(rpctls_pfh);
memset(&sun, 0, sizeof sun);
sun.sun_family = AF_LOCAL;
unlink(_PATH_RPCTLSSDSOCK);
strcpy(sun.sun_path, _PATH_RPCTLSSDSOCK);
sun.sun_len = SUN_LEN(&sun);
fd = socket(AF_LOCAL, SOCK_STREAM, 0);
if (fd < 0) {
if (rpctls_debug_level == 0) {
syslog(LOG_ERR, "Can't create local rpctlssd socket");
exit(1);
}
err(1, "Can't create local rpctlssd socket");
}
oldmask = umask(S_IXUSR|S_IRWXG|S_IRWXO);
if (bind(fd, (struct sockaddr *)&sun, sun.sun_len) < 0) {
if (rpctls_debug_level == 0) {
syslog(LOG_ERR, "Can't bind local rpctlssd socket");
exit(1);
}
err(1, "Can't bind local rpctlssd socket");
}
umask(oldmask);
if (listen(fd, SOMAXCONN) < 0) {
if (rpctls_debug_level == 0) {
syslog(LOG_ERR,
"Can't listen on local rpctlssd socket");
exit(1);
}
err(1, "Can't listen on local rpctlssd socket");
}
xprt = svc_vc_create(fd, RPC_MAXDATASIZE, RPC_MAXDATASIZE);
if (!xprt) {
if (rpctls_debug_level == 0) {
syslog(LOG_ERR,
"Can't create transport for local rpctlssd socket");
exit(1);
}
err(1, "Can't create transport for local rpctlssd socket");
}
if (!svc_reg(xprt, RPCTLSSD, RPCTLSSDVERS, rpctlssd_1, NULL)) {
if (rpctls_debug_level == 0) {
syslog(LOG_ERR,
"Can't register service for local rpctlssd socket");
exit(1);
}
err(1, "Can't register service for local rpctlssd socket");
}
rpctls_ctx = rpctls_setup_ssl(rpctls_certdir);
if (rpctls_ctx == NULL) {
if (rpctls_debug_level == 0) {
syslog(LOG_ERR, "Can't create SSL context");
exit(1);
}
err(1, "Can't create SSL context");
}
rpctls_gothup = false;
LIST_INIT(&rpctls_ssllist);
rpctls_syscall(RPCTLS_SYSC_SRVSETPATH, _PATH_RPCTLSSDSOCK);
rpctls_svc_run();
rpctls_syscall(RPCTLS_SYSC_SRVSHUTDOWN, "");
SSL_CTX_free(rpctls_ctx);
EVP_cleanup();
return (0);
}
bool_t
rpctlssd_null_1_svc(__unused void *argp, __unused void *result,
__unused struct svc_req *rqstp)
{
rpctls_verbose_out("rpctlssd_null_svc: done\n");
return (TRUE);
}
bool_t
rpctlssd_connect_1_svc(__unused void *argp,
struct rpctlssd_connect_res *result, __unused struct svc_req *rqstp)
{
int ngrps, s;
SSL *ssl;
uint32_t flags;
struct ssl_entry *newslp;
uint32_t uid;
uint32_t *gidp;
X509 *cert;
rpctls_verbose_out("rpctlsd_connect_svc: started\n");
memset(result, 0, sizeof(*result));
/* Get the socket fd from the kernel. */
s = rpctls_syscall(RPCTLS_SYSC_SRVSOCKET, "");
if (s < 0)
return (FALSE);
/* Do the server side of a TLS handshake. */
gidp = calloc(NGROUPS, sizeof(*gidp));
ssl = rpctls_server(rpctls_ctx, s, &flags, &uid, &ngrps, gidp, &cert);
if (ssl == NULL) {
free(gidp);
rpctls_verbose_out("rpctlssd_connect_svc: ssl "
"accept failed\n");
/*
* For RPC-over-TLS, this upcall is expected
* to close off the socket upon handshake failure.
*/
close(s);
return (FALSE);
} else {
rpctls_verbose_out("rpctlssd_connect_svc: "
"succeeded flags=0x%x\n", flags);
result->flags = flags;
result->sec = rpctls_ssl_sec;
result->usec = rpctls_ssl_usec;
result->ssl = ++rpctls_ssl_refno;
/* Hard to believe this could ever wrap around.. */
if (rpctls_ssl_refno == 0)
result->ssl = ++rpctls_ssl_refno;
if ((flags & RPCTLS_FLAGS_CERTUSER) != 0) {
result->uid = uid;
result->gid.gid_len = ngrps;
result->gid.gid_val = gidp;
} else {
result->uid = 0;
result->gid.gid_len = 0;
result->gid.gid_val = gidp;
}
}
/* Maintain list of all current SSL *'s */
newslp = malloc(sizeof(*newslp));
newslp->ssl = ssl;
newslp->s = s;
newslp->shutoff = false;
newslp->refno = rpctls_ssl_refno;
newslp->cert = cert;
LIST_INSERT_HEAD(&rpctls_ssllist, newslp, next);
return (TRUE);
}
bool_t
rpctlssd_handlerecord_1_svc(struct rpctlssd_handlerecord_arg *argp,
struct rpctlssd_handlerecord_res *result, __unused struct svc_req *rqstp)
{
struct ssl_entry *slp;
int ret;
char junk;
slp = NULL;
if (argp->sec == rpctls_ssl_sec && argp->usec ==
rpctls_ssl_usec) {
LIST_FOREACH(slp, &rpctls_ssllist, next) {
if (slp->refno == argp->ssl)
break;
}
}
if (slp != NULL) {
rpctls_verbose_out("rpctlssd_handlerecord fd=%d\n",
slp->s);
/*
* An SSL_read() of 0 bytes should fail, but it should
* handle the non-application data record before doing so.
*/
ret = SSL_read(slp->ssl, &junk, 0);
if (ret <= 0) {
/* Check to see if this was a close alert. */
ret = SSL_get_shutdown(slp->ssl);
if ((ret & (SSL_SENT_SHUTDOWN |
SSL_RECEIVED_SHUTDOWN)) == SSL_RECEIVED_SHUTDOWN)
SSL_shutdown(slp->ssl);
} else {
if (rpctls_debug_level == 0)
syslog(LOG_ERR, "SSL_read returned %d", ret);
else
fprintf(stderr, "SSL_read returned %d\n", ret);
}
result->reterr = RPCTLSERR_OK;
} else
result->reterr = RPCTLSERR_NOSSL;
return (TRUE);
}
bool_t
rpctlssd_disconnect_1_svc(struct rpctlssd_disconnect_arg *argp,
struct rpctlssd_disconnect_res *result, __unused struct svc_req *rqstp)
{
struct ssl_entry *slp;
int ret;
slp = NULL;
if (argp->sec == rpctls_ssl_sec && argp->usec ==
rpctls_ssl_usec) {
LIST_FOREACH(slp, &rpctls_ssllist, next) {
if (slp->refno == argp->ssl)
break;
}
}
if (slp != NULL) {
rpctls_verbose_out("rpctlssd_disconnect fd=%d closed\n",
slp->s);
LIST_REMOVE(slp, next);
if (!slp->shutoff) {
ret = SSL_get_shutdown(slp->ssl);
/*
* Do an SSL_shutdown() unless a close alert has
* already been sent.
*/
if ((ret & SSL_SENT_SHUTDOWN) == 0)
SSL_shutdown(slp->ssl);
}
SSL_free(slp->ssl);
if (slp->cert != NULL)
X509_free(slp->cert);
/*
* For RPC-over-TLS, this upcall is expected
* to close off the socket.
*/
if (!slp->shutoff)
shutdown(slp->s, SHUT_WR);
close(slp->s);
free(slp);
result->reterr = RPCTLSERR_OK;
} else
result->reterr = RPCTLSERR_NOCLOSE;
return (TRUE);
}
int
rpctlssd_1_freeresult(__unused SVCXPRT *transp, xdrproc_t xdr_result,
caddr_t result)
{
rpctlssd_connect_res *res;
if (xdr_result == (xdrproc_t)xdr_rpctlssd_connect_res) {
res = (rpctlssd_connect_res *)(void *)result;
free(res->gid.gid_val);
}
return (TRUE);
}
static void
rpctlssd_terminate(int sig __unused)
{
struct ssl_entry *slp;
rpctls_syscall(RPCTLS_SYSC_SRVSHUTDOWN, "");
pidfile_remove(rpctls_pfh);
LIST_FOREACH(slp, &rpctls_ssllist, next)
shutdown(slp->s, SHUT_RD);
exit(0);
}
/* Allow the handshake to proceed. */
static int
rpctls_verify_callback(__unused int preverify_ok,
__unused X509_STORE_CTX *x509_ctx)
{
return (1);
}
static SSL_CTX *
rpctls_setup_ssl(const char *certdir)
{
SSL_CTX *ctx;
char path[PATH_MAX];
size_t len, rlen;
int ret;
SSL_library_init();
SSL_load_error_strings();
OpenSSL_add_all_algorithms();
ctx = SSL_CTX_new(TLS_server_method());
if (ctx == NULL) {
rpctls_verbose_out("rpctls_setup_ssl: SSL_CTX_new failed\n");
return (NULL);
}
SSL_CTX_set_ecdh_auto(ctx, 1);
/*
* Set preferred ciphers, since KERN_TLS only supports a
* few of them.
*/
ret = SSL_CTX_set_cipher_list(ctx, _PREFERRED_CIPHERS);
if (ret == 0) {
rpctls_verbose_out("rpctls_setup_ssl: "
"SSL_CTX_set_cipher_list failed to set any ciphers\n");
SSL_CTX_free(ctx);
return (NULL);
}
/* Get the cert.pem and certkey.pem files from the directory certdir. */
len = strlcpy(path, certdir, sizeof(path));
rlen = sizeof(path) - len;
if (strlcpy(&path[len], "cert.pem", rlen) != 8) {
SSL_CTX_free(ctx);
return (NULL);
}
ret = SSL_CTX_use_certificate_file(ctx, path, SSL_FILETYPE_PEM);
if (ret != 1) {
rpctls_verbose_out("rpctls_setup_ssl: can't use certificate "
"file path=%s ret=%d\n", path, ret);
SSL_CTX_free(ctx);
return (NULL);
}
if (strlcpy(&path[len], "certkey.pem", rlen) != 11) {
SSL_CTX_free(ctx);
return (NULL);
}
ret = SSL_CTX_use_PrivateKey_file(ctx, path, SSL_FILETYPE_PEM);
if (ret != 1) {
rpctls_verbose_out("rpctls_setup_ssl: Can't use private "
"key path=%s ret=%d\n", path, ret);
SSL_CTX_free(ctx);
return (NULL);
}
/* Set Mutual authentication, as required. */
if (rpctls_do_mutual) {
if (rpctls_verify_cafile != NULL ||
rpctls_verify_capath != NULL) {
if (rpctls_crlfile != NULL) {
ret = rpctls_loadcrlfile(ctx);
if (ret == 0) {
rpctls_verbose_out("rpctls_setup_ssl:"
" Load CRLfile failed\n");
SSL_CTX_free(ctx);
return (NULL);
}
}
#if OPENSSL_VERSION_NUMBER >= 0x30000000
ret = 1;
if (rpctls_verify_cafile != NULL)
ret = SSL_CTX_load_verify_file(ctx,
rpctls_verify_cafile);
if (ret != 0 && rpctls_verify_capath != NULL)
ret = SSL_CTX_load_verify_dir(ctx,
rpctls_verify_capath);
#else
ret = SSL_CTX_load_verify_locations(ctx,
rpctls_verify_cafile, rpctls_verify_capath);
#endif
if (ret == 0) {
rpctls_verbose_out("rpctls_setup_ssl: "
"Can't load verify locations\n");
SSL_CTX_free(ctx);
return (NULL);
}
if (rpctls_verify_cafile != NULL)
SSL_CTX_set_client_CA_list(ctx,
SSL_load_client_CA_file(
rpctls_verify_cafile));
}
SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER,
rpctls_verify_callback);
}
SSL_CTX_clear_mode(ctx, SSL_MODE_NO_KTLS_TX | SSL_MODE_NO_KTLS_RX);
return (ctx);
}
static SSL *
rpctls_server(SSL_CTX *ctx, int s, uint32_t *flags, uint32_t *uidp,
int *ngrps, uint32_t *gidp, X509 **certp)
{
SSL *ssl;
X509 *cert;
struct sockaddr *sad;
struct sockaddr_storage ad;
char hostnam[NI_MAXHOST];
int gethostret, ret;
char *cp, *cp2;
long verfret;
*flags = 0;
*certp = NULL;
sad = (struct sockaddr *)&ad;
ssl = SSL_new(ctx);
if (ssl == NULL) {
rpctls_verbose_out("rpctls_server: SSL_new failed\n");
return (NULL);
}
if (SSL_set_fd(ssl, s) != 1) {
rpctls_verbose_out("rpctls_server: SSL_set_fd failed\n");
SSL_free(ssl);
return (NULL);
}
ret = SSL_accept(ssl);
if (ret != 1) {
rpctls_verbose_out("rpctls_server: SSL_accept "
"failed ret=%d\n", ret);
SSL_free(ssl);
return (NULL);
}
*flags |= RPCTLS_FLAGS_HANDSHAKE;
if (rpctls_do_mutual) {
cert = SSL_get_peer_certificate(ssl);
if (cert != NULL) {
gethostret = rpctls_gethost(s, sad, hostnam,
sizeof(hostnam));
if (gethostret == 0)
hostnam[0] = '\0';
cp2 = X509_NAME_oneline(
X509_get_subject_name(cert), NULL, 0);
*flags |= RPCTLS_FLAGS_GOTCERT;
verfret = SSL_get_verify_result(ssl);
if (verfret != X509_V_OK) {
cp = X509_NAME_oneline(
X509_get_issuer_name(cert), NULL, 0);
if (rpctls_debug_level == 0)
syslog(LOG_INFO | LOG_DAEMON,
"rpctls_server: client IP %s "
"issuerName=%s subjectName=%s"
" verify failed %s\n", hostnam,
cp, cp2,
X509_verify_cert_error_string(
verfret));
else
fprintf(stderr,
"rpctls_server: client IP %s "
"issuerName=%s subjectName=%s"
" verify failed %s\n", hostnam,
cp, cp2,
X509_verify_cert_error_string(
verfret));
}
if (verfret ==
X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT ||
verfret == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN)
*flags |= RPCTLS_FLAGS_SELFSIGNED;
else if (verfret == X509_V_OK) {
if (rpctls_comparehost) {
ret = 0;
if (gethostret != 0)
ret = rpctls_checkhost(sad,
cert, rpctls_wildcard);
if (ret != 1) {
*flags |=
RPCTLS_FLAGS_DISABLED;
rpctls_verbose_out(
"rpctls_server: "
"checkhost "
"failed\n");
}
}
if (rpctls_cnuser) {
ret = rpctls_cnname(cert, uidp,
ngrps, gidp);
if (ret != 0)
*flags |= RPCTLS_FLAGS_CERTUSER;
}
*flags |= RPCTLS_FLAGS_VERIFIED;
*certp = cert;
cert = NULL;
}
if (cert != NULL)
X509_free(cert);
} else
rpctls_verbose_out("rpctls_server: "
"No peer certificate\n");
}
/* Check to see that ktls is working for the connection. */
ret = BIO_get_ktls_send(SSL_get_wbio(ssl));
rpctls_verbose_out("rpctls_server: BIO_get_ktls_send=%d\n", ret);
if (ret != 0) {
ret = BIO_get_ktls_recv(SSL_get_rbio(ssl));
rpctls_verbose_out("rpctls_server: BIO_get_ktls_recv=%d\n",
ret);
}
if (ret == 0) {
if (rpctls_debug_level == 0)
syslog(LOG_ERR, "ktls not working");
else
fprintf(stderr, "ktls not working\n");
/*
* The handshake has completed, so all that can be
* done is disable the connection.
*/
*flags |= RPCTLS_FLAGS_DISABLED;
}
return (ssl);
}
/*
* Acquire the dnsname for this server.
*/
static char *
rpctls_getdnsname(char *hostname)
{
char *cp, *dnsname;
struct addrinfo *aip, hints;
int error;
dnsname = NULL;
if (gethostname(hostname, MAXHOSTNAMELEN) == 0) {
if ((cp = strchr(hostname, '.')) != NULL &&
*(cp + 1) != '\0') {
*cp = '@';
dnsname = cp;
} else {
memset((void *)&hints, 0, sizeof (hints));
hints.ai_flags = AI_CANONNAME;
error = getaddrinfo(hostname, NULL, &hints, &aip);
if (error == 0) {
if (aip->ai_canonname != NULL &&
(cp = strchr(aip->ai_canonname, '.')) !=
NULL && *(cp + 1) != '\0') {
hostname[0] = '@';
strlcpy(&hostname[1], cp + 1,
MAXHOSTNAMELEN + 1);
dnsname = hostname;
}
freeaddrinfo(aip);
}
}
}
return (dnsname);
}
/*
* Check for an otherName component of subjectAltName where the OID
* matches and the "domain" matches that of this server.
* If found, map "user" to a <uid, gidlist> for it.
*/
static int
rpctls_cnname(X509 *cert, uint32_t *uidp, int *ngrps, uint32_t *gidp)
{
char *cp, usern[1024 + 1];
struct passwd *pwd;
gid_t gids[NGROUPS];
int i, j;
GENERAL_NAMES *genlist;
GENERAL_NAME *genname;
OTHERNAME *val;
size_t slen;
/* First, find the otherName in the subjectAltName. */
genlist = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);
if (genlist == NULL)
return (0);
cp = NULL;
for (i = 0; i < sk_GENERAL_NAME_num(genlist); i++) {
genname = sk_GENERAL_NAME_value(genlist, i);
if (genname->type != GEN_OTHERNAME)
continue;
val = genname->d.otherName;
/* Check to see that it is the correct OID. */
slen = i2t_ASN1_OBJECT(usern, sizeof(usern), val->type_id);
if (slen != strlen(rpctls_cnuseroid) || memcmp(usern,
rpctls_cnuseroid, slen) != 0)
continue;
/* Sanity check the otherName. */
if (val->value->type != V_ASN1_UTF8STRING ||
val->value->value.utf8string->length < 3 ||
(size_t)val->value->value.utf8string->length > sizeof(usern)
- 1) {
rpctls_verbose_out("rpctls_cnname: invalid cnuser "
"type=%d\n", val->value->type);
continue;
}
/* Look for a "user" in the otherName */
memcpy(usern, val->value->value.utf8string->data,
val->value->value.utf8string->length);
usern[val->value->value.utf8string->length] = '\0';
/* Now, look for the @dnsname suffix in the commonName. */
cp = strcasestr(usern, rpctls_dnsname);
if (cp == NULL)
continue;
if (*(cp + strlen(rpctls_dnsname)) != '\0') {
cp = NULL;
continue;
}
*cp = '\0';
break;
}
if (cp == NULL)
return (0);
/* See if the "user" is in the passwd database. */
pwd = getpwnam(usern);
if (pwd == NULL)
return (0);
*uidp = pwd->pw_uid;
*ngrps = NGROUPS;
if (getgrouplist(pwd->pw_name, pwd->pw_gid, gids, ngrps) < 0)
return (0);
rpctls_verbose_out("mapped user=%s ngrps=%d uid=%d\n", pwd->pw_name,
*ngrps, pwd->pw_uid);
for (j = 0; j < *ngrps; j++)
gidp[j] = gids[j];
return (1);
}
static void
rpctls_huphandler(int sig __unused)
{
rpctls_gothup = true;
}