1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2008 Isilon Inc http://www.isilon.com/ 5 * Authors: Doug Rabson <dfr@rabson.org> 6 * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org> 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 /* 31 * Extensively modified from /usr/src/usr.sbin/gssd.c r344402 for 32 * the server side of kernel RPC-over-TLS by Rick Macklem. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/param.h> 39 #include <sys/types.h> 40 #include <sys/linker.h> 41 #include <sys/module.h> 42 #include <sys/queue.h> 43 #include <sys/stat.h> 44 #include <sys/sysctl.h> 45 #include <sys/syslog.h> 46 #include <sys/time.h> 47 #include <err.h> 48 #include <getopt.h> 49 #include <libutil.h> 50 #include <netdb.h> 51 #include <pwd.h> 52 #include <signal.h> 53 #include <stdarg.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <stdbool.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 #include <rpc/rpc.h> 61 #include <rpc/rpc_com.h> 62 #include <rpc/rpcsec_tls.h> 63 64 #include <openssl/opensslconf.h> 65 #include <openssl/bio.h> 66 #include <openssl/ssl.h> 67 #include <openssl/err.h> 68 #include <openssl/x509v3.h> 69 70 #include "rpctlssd.h" 71 #include "rpc.tlscommon.h" 72 73 #ifndef _PATH_RPCTLSSDSOCK 74 #define _PATH_RPCTLSSDSOCK "/var/run/rpc.tlsservd.sock" 75 #endif 76 #ifndef _PATH_CERTANDKEY 77 #define _PATH_CERTANDKEY "/etc/rpc.tlsservd/" 78 #endif 79 #ifndef _PATH_RPCTLSSDPID 80 #define _PATH_RPCTLSSDPID "/var/run/rpc.tlsservd.pid" 81 #endif 82 #ifndef _PREFERRED_CIPHERS 83 #define _PREFERRED_CIPHERS "AES128-GCM-SHA256" 84 #endif 85 86 /* Global variables also used by rpc.tlscommon.c. */ 87 int rpctls_debug_level; 88 bool rpctls_verbose; 89 SSL_CTX *rpctls_ctx = NULL; 90 const char *rpctls_verify_cafile = NULL; 91 const char *rpctls_verify_capath = NULL; 92 char *rpctls_crlfile = NULL; 93 bool rpctls_gothup = false; 94 struct ssl_list rpctls_ssllist; 95 96 static struct pidfh *rpctls_pfh = NULL; 97 static bool rpctls_do_mutual = false; 98 static const char *rpctls_certdir = _PATH_CERTANDKEY; 99 static bool rpctls_comparehost = false; 100 static unsigned int rpctls_wildcard = X509_CHECK_FLAG_NO_WILDCARDS; 101 static uint64_t rpctls_ssl_refno = 0; 102 static uint64_t rpctls_ssl_sec = 0; 103 static uint64_t rpctls_ssl_usec = 0; 104 static bool rpctls_cnuser = false; 105 static char *rpctls_dnsname; 106 static const char *rpctls_cnuseroid = "1.3.6.1.4.1.2238.1.1.1"; 107 108 static void rpctlssd_terminate(int); 109 static SSL_CTX *rpctls_setup_ssl(const char *certdir); 110 static SSL *rpctls_server(SSL_CTX *ctx, int s, 111 uint32_t *flags, uint32_t *uidp, 112 int *ngrps, uint32_t *gidp, X509 **certp); 113 static int rpctls_cnname(X509 *cert, uint32_t *uidp, 114 int *ngrps, uint32_t *gidp); 115 static char *rpctls_getdnsname(char *dnsname); 116 static void rpctls_huphandler(int sig __unused); 117 118 extern void rpctlssd_1(struct svc_req *rqstp, SVCXPRT *transp); 119 120 static struct option longopts[] = { 121 { "certdir", required_argument, NULL, 'D' }, 122 { "debuglevel", no_argument, NULL, 'd' }, 123 { "checkhost", no_argument, NULL, 'h' }, 124 { "verifylocs", required_argument, NULL, 'l' }, 125 { "mutualverf", no_argument, NULL, 'm' }, 126 { "domain", required_argument, NULL, 'n' }, 127 { "verifydir", required_argument, NULL, 'p' }, 128 { "crl", required_argument, NULL, 'r' }, 129 { "certuser", no_argument, NULL, 'u' }, 130 { "verbose", no_argument, NULL, 'v' }, 131 { "multiwild", no_argument, NULL, 'W' }, 132 { "singlewild", no_argument, NULL, 'w' }, 133 { NULL, 0, NULL, 0 } 134 }; 135 136 int 137 main(int argc, char **argv) 138 { 139 /* 140 * We provide an RPC service on a local-domain socket. The 141 * kernel rpctls code will upcall to this daemon to do the initial 142 * TLS handshake. 143 */ 144 struct sockaddr_un sun; 145 int ch, debug, fd, oldmask; 146 SVCXPRT *xprt; 147 struct timeval tm; 148 struct timezone tz; 149 char hostname[MAXHOSTNAMELEN + 2]; 150 pid_t otherpid; 151 bool tls_enable; 152 size_t tls_enable_len; 153 154 /* Check that another rpctlssd isn't already running. */ 155 rpctls_pfh = pidfile_open(_PATH_RPCTLSSDPID, 0600, &otherpid); 156 if (rpctls_pfh == NULL) { 157 if (errno == EEXIST) 158 errx(1, "rpctlssd already running, pid: %d.", otherpid); 159 warn("cannot open or create pidfile"); 160 } 161 162 /* Check to see that the ktls is enabled. */ 163 tls_enable_len = sizeof(tls_enable); 164 if (sysctlbyname("kern.ipc.tls.enable", &tls_enable, &tls_enable_len, 165 NULL, 0) != 0 || !tls_enable) 166 errx(1, "Kernel TLS not enabled"); 167 168 /* Get the time when this daemon is started. */ 169 gettimeofday(&tm, &tz); 170 rpctls_ssl_sec = tm.tv_sec; 171 rpctls_ssl_usec = tm.tv_usec; 172 173 /* Set the dns name for the server. */ 174 rpctls_dnsname = rpctls_getdnsname(hostname); 175 if (rpctls_dnsname == NULL) { 176 strcpy(hostname, "@default.domain"); 177 rpctls_dnsname = hostname; 178 } 179 180 debug = 0; 181 rpctls_verbose = false; 182 while ((ch = getopt_long(argc, argv, "D:dhl:n:mp:r:uvWw", longopts, 183 NULL)) != -1) { 184 switch (ch) { 185 case 'D': 186 rpctls_certdir = optarg; 187 break; 188 case 'd': 189 rpctls_debug_level++; 190 break; 191 case 'h': 192 rpctls_comparehost = true; 193 break; 194 case 'l': 195 rpctls_verify_cafile = optarg; 196 break; 197 case 'm': 198 rpctls_do_mutual = true; 199 break; 200 case 'n': 201 hostname[0] = '@'; 202 strlcpy(&hostname[1], optarg, MAXHOSTNAMELEN + 1); 203 rpctls_dnsname = hostname; 204 break; 205 case 'p': 206 rpctls_verify_capath = optarg; 207 break; 208 case 'r': 209 rpctls_crlfile = optarg; 210 break; 211 case 'u': 212 rpctls_cnuser = true; 213 break; 214 case 'v': 215 rpctls_verbose = true; 216 break; 217 case 'W': 218 if (rpctls_wildcard != X509_CHECK_FLAG_NO_WILDCARDS) 219 errx(1, "options -w and -W are mutually " 220 "exclusive"); 221 rpctls_wildcard = X509_CHECK_FLAG_MULTI_LABEL_WILDCARDS; 222 break; 223 case 'w': 224 if (rpctls_wildcard != X509_CHECK_FLAG_NO_WILDCARDS) 225 errx(1, "options -w and -W are mutually " 226 "exclusive"); 227 rpctls_wildcard = 0; 228 break; 229 default: 230 fprintf(stderr, "usage: %s " 231 "[-D/--certdir certdir] [-d/--debuglevel] " 232 "[-h/--checkhost] " 233 "[-l/--verifylocs CAfile] [-m/--mutualverf] " 234 "[-n/--domain domain_name] " 235 "[-p/--verifydir CApath] [-r/--crl CRLfile] " 236 "[-u/--certuser] [-v/--verbose] [-W/--multiwild] " 237 "[-w/--singlewild]\n", argv[0]); 238 exit(1); 239 } 240 } 241 if (rpctls_do_mutual && rpctls_verify_cafile == NULL && 242 rpctls_verify_capath == NULL) 243 errx(1, "-m requires the -l <CAfile> and/or " 244 "-p <CApath> options"); 245 if (rpctls_comparehost && (!rpctls_do_mutual || 246 (rpctls_verify_cafile == NULL && rpctls_verify_capath == NULL))) 247 errx(1, "-h requires the -m plus the " 248 "-l <CAfile> and/or -p <CApath> options"); 249 if (!rpctls_comparehost && rpctls_wildcard != 250 X509_CHECK_FLAG_NO_WILDCARDS) 251 errx(1, "The -w or -W options require the -h option"); 252 if (rpctls_cnuser && (!rpctls_do_mutual || 253 (rpctls_verify_cafile == NULL && rpctls_verify_capath == NULL))) 254 errx(1, "-u requires the -m plus the " 255 "-l <CAfile> and/or -p <CApath> options"); 256 257 if (modfind("krpc") < 0) { 258 /* Not present in kernel, try loading it */ 259 if (kldload("krpc") < 0 || modfind("krpc") < 0) 260 errx(1, "Kernel RPC is not available"); 261 } 262 263 if (rpctls_debug_level == 0) { 264 if (daemon(0, 0) != 0) 265 err(1, "Can't daemonize"); 266 signal(SIGINT, SIG_IGN); 267 signal(SIGQUIT, SIG_IGN); 268 signal(SIGHUP, SIG_IGN); 269 } 270 signal(SIGTERM, rpctlssd_terminate); 271 signal(SIGPIPE, SIG_IGN); 272 signal(SIGHUP, rpctls_huphandler); 273 274 pidfile_write(rpctls_pfh); 275 276 memset(&sun, 0, sizeof sun); 277 sun.sun_family = AF_LOCAL; 278 unlink(_PATH_RPCTLSSDSOCK); 279 strcpy(sun.sun_path, _PATH_RPCTLSSDSOCK); 280 sun.sun_len = SUN_LEN(&sun); 281 fd = socket(AF_LOCAL, SOCK_STREAM, 0); 282 if (fd < 0) { 283 if (rpctls_debug_level == 0) { 284 syslog(LOG_ERR, "Can't create local rpctlssd socket"); 285 exit(1); 286 } 287 err(1, "Can't create local rpctlssd socket"); 288 } 289 oldmask = umask(S_IXUSR|S_IRWXG|S_IRWXO); 290 if (bind(fd, (struct sockaddr *)&sun, sun.sun_len) < 0) { 291 if (rpctls_debug_level == 0) { 292 syslog(LOG_ERR, "Can't bind local rpctlssd socket"); 293 exit(1); 294 } 295 err(1, "Can't bind local rpctlssd socket"); 296 } 297 umask(oldmask); 298 if (listen(fd, SOMAXCONN) < 0) { 299 if (rpctls_debug_level == 0) { 300 syslog(LOG_ERR, 301 "Can't listen on local rpctlssd socket"); 302 exit(1); 303 } 304 err(1, "Can't listen on local rpctlssd socket"); 305 } 306 xprt = svc_vc_create(fd, RPC_MAXDATASIZE, RPC_MAXDATASIZE); 307 if (!xprt) { 308 if (rpctls_debug_level == 0) { 309 syslog(LOG_ERR, 310 "Can't create transport for local rpctlssd socket"); 311 exit(1); 312 } 313 err(1, "Can't create transport for local rpctlssd socket"); 314 } 315 if (!svc_reg(xprt, RPCTLSSD, RPCTLSSDVERS, rpctlssd_1, NULL)) { 316 if (rpctls_debug_level == 0) { 317 syslog(LOG_ERR, 318 "Can't register service for local rpctlssd socket"); 319 exit(1); 320 } 321 err(1, "Can't register service for local rpctlssd socket"); 322 } 323 324 rpctls_ctx = rpctls_setup_ssl(rpctls_certdir); 325 if (rpctls_ctx == NULL) { 326 if (rpctls_debug_level == 0) { 327 syslog(LOG_ERR, "Can't create SSL context"); 328 exit(1); 329 } 330 err(1, "Can't create SSL context"); 331 } 332 rpctls_gothup = false; 333 LIST_INIT(&rpctls_ssllist); 334 335 rpctls_syscall(RPCTLS_SYSC_SRVSETPATH, _PATH_RPCTLSSDSOCK); 336 337 rpctls_svc_run(); 338 339 rpctls_syscall(RPCTLS_SYSC_SRVSHUTDOWN, ""); 340 341 SSL_CTX_free(rpctls_ctx); 342 EVP_cleanup(); 343 return (0); 344 } 345 346 bool_t 347 rpctlssd_null_1_svc(__unused void *argp, __unused void *result, 348 __unused struct svc_req *rqstp) 349 { 350 351 rpctls_verbose_out("rpctlssd_null_svc: done\n"); 352 return (TRUE); 353 } 354 355 bool_t 356 rpctlssd_connect_1_svc(__unused void *argp, 357 struct rpctlssd_connect_res *result, __unused struct svc_req *rqstp) 358 { 359 int ngrps, s; 360 SSL *ssl; 361 uint32_t flags; 362 struct ssl_entry *newslp; 363 uint32_t uid; 364 uint32_t *gidp; 365 X509 *cert; 366 367 rpctls_verbose_out("rpctlsd_connect_svc: started\n"); 368 memset(result, 0, sizeof(*result)); 369 /* Get the socket fd from the kernel. */ 370 s = rpctls_syscall(RPCTLS_SYSC_SRVSOCKET, ""); 371 if (s < 0) 372 return (FALSE); 373 374 /* Do the server side of a TLS handshake. */ 375 gidp = calloc(NGROUPS, sizeof(*gidp)); 376 ssl = rpctls_server(rpctls_ctx, s, &flags, &uid, &ngrps, gidp, &cert); 377 if (ssl == NULL) { 378 free(gidp); 379 rpctls_verbose_out("rpctlssd_connect_svc: ssl " 380 "accept failed\n"); 381 /* 382 * For RPC-over-TLS, this upcall is expected 383 * to close off the socket upon handshake failure. 384 */ 385 close(s); 386 return (FALSE); 387 } else { 388 rpctls_verbose_out("rpctlssd_connect_svc: " 389 "succeeded flags=0x%x\n", flags); 390 result->flags = flags; 391 result->sec = rpctls_ssl_sec; 392 result->usec = rpctls_ssl_usec; 393 result->ssl = ++rpctls_ssl_refno; 394 /* Hard to believe this could ever wrap around.. */ 395 if (rpctls_ssl_refno == 0) 396 result->ssl = ++rpctls_ssl_refno; 397 if ((flags & RPCTLS_FLAGS_CERTUSER) != 0) { 398 result->uid = uid; 399 result->gid.gid_len = ngrps; 400 result->gid.gid_val = gidp; 401 } else { 402 result->uid = 0; 403 result->gid.gid_len = 0; 404 result->gid.gid_val = gidp; 405 } 406 } 407 408 /* Maintain list of all current SSL *'s */ 409 newslp = malloc(sizeof(*newslp)); 410 newslp->ssl = ssl; 411 newslp->s = s; 412 newslp->shutoff = false; 413 newslp->refno = rpctls_ssl_refno; 414 newslp->cert = cert; 415 LIST_INSERT_HEAD(&rpctls_ssllist, newslp, next); 416 return (TRUE); 417 } 418 419 bool_t 420 rpctlssd_handlerecord_1_svc(struct rpctlssd_handlerecord_arg *argp, 421 struct rpctlssd_handlerecord_res *result, __unused struct svc_req *rqstp) 422 { 423 struct ssl_entry *slp; 424 int ret; 425 char junk; 426 427 slp = NULL; 428 if (argp->sec == rpctls_ssl_sec && argp->usec == 429 rpctls_ssl_usec) { 430 LIST_FOREACH(slp, &rpctls_ssllist, next) { 431 if (slp->refno == argp->ssl) 432 break; 433 } 434 } 435 436 if (slp != NULL) { 437 rpctls_verbose_out("rpctlssd_handlerecord fd=%d\n", 438 slp->s); 439 /* 440 * An SSL_read() of 0 bytes should fail, but it should 441 * handle the non-application data record before doing so. 442 */ 443 ret = SSL_read(slp->ssl, &junk, 0); 444 if (ret <= 0) { 445 /* Check to see if this was a close alert. */ 446 ret = SSL_get_shutdown(slp->ssl); 447 if ((ret & (SSL_SENT_SHUTDOWN | 448 SSL_RECEIVED_SHUTDOWN)) == SSL_RECEIVED_SHUTDOWN) 449 SSL_shutdown(slp->ssl); 450 } else { 451 if (rpctls_debug_level == 0) 452 syslog(LOG_ERR, "SSL_read returned %d", ret); 453 else 454 fprintf(stderr, "SSL_read returned %d\n", ret); 455 } 456 result->reterr = RPCTLSERR_OK; 457 } else 458 result->reterr = RPCTLSERR_NOSSL; 459 return (TRUE); 460 } 461 462 bool_t 463 rpctlssd_disconnect_1_svc(struct rpctlssd_disconnect_arg *argp, 464 struct rpctlssd_disconnect_res *result, __unused struct svc_req *rqstp) 465 { 466 struct ssl_entry *slp; 467 int ret; 468 469 slp = NULL; 470 if (argp->sec == rpctls_ssl_sec && argp->usec == 471 rpctls_ssl_usec) { 472 LIST_FOREACH(slp, &rpctls_ssllist, next) { 473 if (slp->refno == argp->ssl) 474 break; 475 } 476 } 477 478 if (slp != NULL) { 479 rpctls_verbose_out("rpctlssd_disconnect fd=%d closed\n", 480 slp->s); 481 LIST_REMOVE(slp, next); 482 if (!slp->shutoff) { 483 ret = SSL_get_shutdown(slp->ssl); 484 /* 485 * Do an SSL_shutdown() unless a close alert has 486 * already been sent. 487 */ 488 if ((ret & SSL_SENT_SHUTDOWN) == 0) 489 SSL_shutdown(slp->ssl); 490 } 491 SSL_free(slp->ssl); 492 if (slp->cert != NULL) 493 X509_free(slp->cert); 494 /* 495 * For RPC-over-TLS, this upcall is expected 496 * to close off the socket. 497 */ 498 if (!slp->shutoff) 499 shutdown(slp->s, SHUT_WR); 500 close(slp->s); 501 free(slp); 502 result->reterr = RPCTLSERR_OK; 503 } else 504 result->reterr = RPCTLSERR_NOCLOSE; 505 return (TRUE); 506 } 507 508 int 509 rpctlssd_1_freeresult(__unused SVCXPRT *transp, xdrproc_t xdr_result, 510 caddr_t result) 511 { 512 rpctlssd_connect_res *res; 513 514 if (xdr_result == (xdrproc_t)xdr_rpctlssd_connect_res) { 515 res = (rpctlssd_connect_res *)(void *)result; 516 free(res->gid.gid_val); 517 } 518 return (TRUE); 519 } 520 521 static void 522 rpctlssd_terminate(int sig __unused) 523 { 524 struct ssl_entry *slp; 525 526 rpctls_syscall(RPCTLS_SYSC_SRVSHUTDOWN, ""); 527 pidfile_remove(rpctls_pfh); 528 529 LIST_FOREACH(slp, &rpctls_ssllist, next) 530 shutdown(slp->s, SHUT_RD); 531 exit(0); 532 } 533 534 /* Allow the handshake to proceed. */ 535 static int 536 rpctls_verify_callback(__unused int preverify_ok, 537 __unused X509_STORE_CTX *x509_ctx) 538 { 539 540 return (1); 541 } 542 543 static SSL_CTX * 544 rpctls_setup_ssl(const char *certdir) 545 { 546 SSL_CTX *ctx; 547 char path[PATH_MAX]; 548 size_t len, rlen; 549 int ret; 550 551 SSL_library_init(); 552 SSL_load_error_strings(); 553 OpenSSL_add_all_algorithms(); 554 555 ctx = SSL_CTX_new(TLS_server_method()); 556 if (ctx == NULL) { 557 rpctls_verbose_out("rpctls_setup_ssl: SSL_CTX_new failed\n"); 558 return (NULL); 559 } 560 SSL_CTX_set_ecdh_auto(ctx, 1); 561 562 /* 563 * Set preferred ciphers, since KERN_TLS only supports a 564 * few of them. 565 */ 566 ret = SSL_CTX_set_cipher_list(ctx, _PREFERRED_CIPHERS); 567 if (ret == 0) { 568 rpctls_verbose_out("rpctls_setup_ssl: " 569 "SSL_CTX_set_cipher_list failed to set any ciphers\n"); 570 SSL_CTX_free(ctx); 571 return (NULL); 572 } 573 574 /* Get the cert.pem and certkey.pem files from the directory certdir. */ 575 len = strlcpy(path, certdir, sizeof(path)); 576 rlen = sizeof(path) - len; 577 if (strlcpy(&path[len], "cert.pem", rlen) != 8) { 578 SSL_CTX_free(ctx); 579 return (NULL); 580 } 581 ret = SSL_CTX_use_certificate_file(ctx, path, SSL_FILETYPE_PEM); 582 if (ret != 1) { 583 rpctls_verbose_out("rpctls_setup_ssl: can't use certificate " 584 "file path=%s ret=%d\n", path, ret); 585 SSL_CTX_free(ctx); 586 return (NULL); 587 } 588 if (strlcpy(&path[len], "certkey.pem", rlen) != 11) { 589 SSL_CTX_free(ctx); 590 return (NULL); 591 } 592 ret = SSL_CTX_use_PrivateKey_file(ctx, path, SSL_FILETYPE_PEM); 593 if (ret != 1) { 594 rpctls_verbose_out("rpctls_setup_ssl: Can't use private " 595 "key path=%s ret=%d\n", path, ret); 596 SSL_CTX_free(ctx); 597 return (NULL); 598 } 599 600 /* Set Mutual authentication, as required. */ 601 if (rpctls_do_mutual) { 602 if (rpctls_verify_cafile != NULL || 603 rpctls_verify_capath != NULL) { 604 if (rpctls_crlfile != NULL) { 605 ret = rpctls_loadcrlfile(ctx); 606 if (ret == 0) { 607 rpctls_verbose_out("rpctls_setup_ssl:" 608 " Load CRLfile failed\n"); 609 SSL_CTX_free(ctx); 610 return (NULL); 611 } 612 } 613 #if OPENSSL_VERSION_NUMBER >= 0x30000000 614 ret = 1; 615 if (rpctls_verify_cafile != NULL) 616 ret = SSL_CTX_load_verify_file(ctx, 617 rpctls_verify_cafile); 618 if (ret != 0 && rpctls_verify_capath != NULL) 619 ret = SSL_CTX_load_verify_dir(ctx, 620 rpctls_verify_capath); 621 #else 622 ret = SSL_CTX_load_verify_locations(ctx, 623 rpctls_verify_cafile, rpctls_verify_capath); 624 #endif 625 if (ret == 0) { 626 rpctls_verbose_out("rpctls_setup_ssl: " 627 "Can't load verify locations\n"); 628 SSL_CTX_free(ctx); 629 return (NULL); 630 } 631 if (rpctls_verify_cafile != NULL) 632 SSL_CTX_set_client_CA_list(ctx, 633 SSL_load_client_CA_file( 634 rpctls_verify_cafile)); 635 } 636 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, 637 rpctls_verify_callback); 638 } 639 #ifdef SSL_OP_ENABLE_KTLS 640 SSL_CTX_set_options(ctx, SSL_OP_ENABLE_KTLS); 641 #endif 642 #ifdef SSL_MODE_NO_KTLS_TX 643 SSL_CTX_clear_mode(ctx, SSL_MODE_NO_KTLS_TX | SSL_MODE_NO_KTLS_RX); 644 #endif 645 return (ctx); 646 } 647 648 static SSL * 649 rpctls_server(SSL_CTX *ctx, int s, uint32_t *flags, uint32_t *uidp, 650 int *ngrps, uint32_t *gidp, X509 **certp) 651 { 652 SSL *ssl; 653 X509 *cert; 654 struct sockaddr *sad; 655 struct sockaddr_storage ad; 656 char hostnam[NI_MAXHOST]; 657 int gethostret, ret; 658 char *cp, *cp2; 659 long verfret; 660 661 *flags = 0; 662 *certp = NULL; 663 sad = (struct sockaddr *)&ad; 664 ssl = SSL_new(ctx); 665 if (ssl == NULL) { 666 rpctls_verbose_out("rpctls_server: SSL_new failed\n"); 667 return (NULL); 668 } 669 if (SSL_set_fd(ssl, s) != 1) { 670 rpctls_verbose_out("rpctls_server: SSL_set_fd failed\n"); 671 SSL_free(ssl); 672 return (NULL); 673 } 674 ret = SSL_accept(ssl); 675 if (ret != 1) { 676 rpctls_verbose_out("rpctls_server: SSL_accept " 677 "failed ret=%d\n", ret); 678 SSL_free(ssl); 679 return (NULL); 680 } 681 *flags |= RPCTLS_FLAGS_HANDSHAKE; 682 if (rpctls_do_mutual) { 683 cert = SSL_get_peer_certificate(ssl); 684 if (cert != NULL) { 685 gethostret = rpctls_gethost(s, sad, hostnam, 686 sizeof(hostnam)); 687 if (gethostret == 0) 688 hostnam[0] = '\0'; 689 cp2 = X509_NAME_oneline( 690 X509_get_subject_name(cert), NULL, 0); 691 *flags |= RPCTLS_FLAGS_GOTCERT; 692 verfret = SSL_get_verify_result(ssl); 693 if (verfret != X509_V_OK) { 694 cp = X509_NAME_oneline( 695 X509_get_issuer_name(cert), NULL, 0); 696 if (rpctls_debug_level == 0) 697 syslog(LOG_INFO | LOG_DAEMON, 698 "rpctls_server: client IP %s " 699 "issuerName=%s subjectName=%s" 700 " verify failed %s\n", hostnam, 701 cp, cp2, 702 X509_verify_cert_error_string( 703 verfret)); 704 else 705 fprintf(stderr, 706 "rpctls_server: client IP %s " 707 "issuerName=%s subjectName=%s" 708 " verify failed %s\n", hostnam, 709 cp, cp2, 710 X509_verify_cert_error_string( 711 verfret)); 712 } 713 if (verfret == 714 X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT || 715 verfret == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN) 716 *flags |= RPCTLS_FLAGS_SELFSIGNED; 717 else if (verfret == X509_V_OK) { 718 if (rpctls_comparehost) { 719 ret = 0; 720 if (gethostret != 0) 721 ret = rpctls_checkhost(sad, 722 cert, rpctls_wildcard); 723 if (ret != 1) { 724 *flags |= 725 RPCTLS_FLAGS_DISABLED; 726 rpctls_verbose_out( 727 "rpctls_server: " 728 "checkhost " 729 "failed\n"); 730 } 731 } 732 if (rpctls_cnuser) { 733 ret = rpctls_cnname(cert, uidp, 734 ngrps, gidp); 735 if (ret != 0) 736 *flags |= RPCTLS_FLAGS_CERTUSER; 737 } 738 *flags |= RPCTLS_FLAGS_VERIFIED; 739 *certp = cert; 740 cert = NULL; 741 } 742 if (cert != NULL) 743 X509_free(cert); 744 } else 745 rpctls_verbose_out("rpctls_server: " 746 "No peer certificate\n"); 747 } 748 749 /* Check to see that ktls is working for the connection. */ 750 ret = BIO_get_ktls_send(SSL_get_wbio(ssl)); 751 rpctls_verbose_out("rpctls_server: BIO_get_ktls_send=%d\n", ret); 752 if (ret != 0) { 753 ret = BIO_get_ktls_recv(SSL_get_rbio(ssl)); 754 rpctls_verbose_out("rpctls_server: BIO_get_ktls_recv=%d\n", 755 ret); 756 } 757 if (ret == 0) { 758 if (rpctls_debug_level == 0) 759 syslog(LOG_ERR, "ktls not working"); 760 else 761 fprintf(stderr, "ktls not working\n"); 762 /* 763 * The handshake has completed, so all that can be 764 * done is disable the connection. 765 */ 766 *flags |= RPCTLS_FLAGS_DISABLED; 767 } 768 769 return (ssl); 770 } 771 772 /* 773 * Acquire the dnsname for this server. 774 */ 775 static char * 776 rpctls_getdnsname(char *hostname) 777 { 778 char *cp, *dnsname; 779 struct addrinfo *aip, hints; 780 int error; 781 782 dnsname = NULL; 783 if (gethostname(hostname, MAXHOSTNAMELEN) == 0) { 784 if ((cp = strchr(hostname, '.')) != NULL && 785 *(cp + 1) != '\0') { 786 *cp = '@'; 787 dnsname = cp; 788 } else { 789 memset((void *)&hints, 0, sizeof (hints)); 790 hints.ai_flags = AI_CANONNAME; 791 error = getaddrinfo(hostname, NULL, &hints, &aip); 792 if (error == 0) { 793 if (aip->ai_canonname != NULL && 794 (cp = strchr(aip->ai_canonname, '.')) != 795 NULL && *(cp + 1) != '\0') { 796 hostname[0] = '@'; 797 strlcpy(&hostname[1], cp + 1, 798 MAXHOSTNAMELEN + 1); 799 dnsname = hostname; 800 } 801 freeaddrinfo(aip); 802 } 803 } 804 } 805 return (dnsname); 806 } 807 808 /* 809 * Check for an otherName component of subjectAltName where the OID 810 * matches and the "domain" matches that of this server. 811 * If found, map "user" to a <uid, gidlist> for it. 812 */ 813 static int 814 rpctls_cnname(X509 *cert, uint32_t *uidp, int *ngrps, uint32_t *gidp) 815 { 816 char *cp, usern[1024 + 1]; 817 struct passwd *pwd; 818 gid_t gids[NGROUPS]; 819 int i, j; 820 GENERAL_NAMES *genlist; 821 GENERAL_NAME *genname; 822 OTHERNAME *val; 823 size_t slen; 824 825 /* First, find the otherName in the subjectAltName. */ 826 genlist = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL); 827 if (genlist == NULL) 828 return (0); 829 cp = NULL; 830 for (i = 0; i < sk_GENERAL_NAME_num(genlist); i++) { 831 genname = sk_GENERAL_NAME_value(genlist, i); 832 if (genname->type != GEN_OTHERNAME) 833 continue; 834 val = genname->d.otherName; 835 836 /* Check to see that it is the correct OID. */ 837 slen = i2t_ASN1_OBJECT(usern, sizeof(usern), val->type_id); 838 if (slen != strlen(rpctls_cnuseroid) || memcmp(usern, 839 rpctls_cnuseroid, slen) != 0) 840 continue; 841 842 /* Sanity check the otherName. */ 843 if (val->value->type != V_ASN1_UTF8STRING || 844 val->value->value.utf8string->length < 3 || 845 (size_t)val->value->value.utf8string->length > sizeof(usern) 846 - 1) { 847 rpctls_verbose_out("rpctls_cnname: invalid cnuser " 848 "type=%d\n", val->value->type); 849 continue; 850 } 851 852 /* Look for a "user" in the otherName */ 853 memcpy(usern, val->value->value.utf8string->data, 854 val->value->value.utf8string->length); 855 usern[val->value->value.utf8string->length] = '\0'; 856 857 /* Now, look for the @dnsname suffix in the commonName. */ 858 cp = strcasestr(usern, rpctls_dnsname); 859 if (cp == NULL) 860 continue; 861 if (*(cp + strlen(rpctls_dnsname)) != '\0') { 862 cp = NULL; 863 continue; 864 } 865 *cp = '\0'; 866 break; 867 } 868 if (cp == NULL) 869 return (0); 870 871 /* See if the "user" is in the passwd database. */ 872 pwd = getpwnam(usern); 873 if (pwd == NULL) 874 return (0); 875 *uidp = pwd->pw_uid; 876 *ngrps = NGROUPS; 877 if (getgrouplist(pwd->pw_name, pwd->pw_gid, gids, ngrps) < 0) 878 return (0); 879 rpctls_verbose_out("mapped user=%s ngrps=%d uid=%d\n", pwd->pw_name, 880 *ngrps, pwd->pw_uid); 881 for (j = 0; j < *ngrps; j++) 882 gidp[j] = gids[j]; 883 return (1); 884 } 885 886 static void 887 rpctls_huphandler(int sig __unused) 888 { 889 890 rpctls_gothup = true; 891 } 892