1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 <sys/wait.h> 48 #include <err.h> 49 #include <getopt.h> 50 #include <libutil.h> 51 #include <netdb.h> 52 #include <pwd.h> 53 #include <signal.h> 54 #include <stdarg.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <stdbool.h> 58 #include <string.h> 59 #include <unistd.h> 60 61 #include <rpc/rpc.h> 62 #include <rpc/rpc_com.h> 63 #include <rpc/rpcsec_tls.h> 64 65 #include <openssl/opensslconf.h> 66 #include <openssl/bio.h> 67 #include <openssl/ssl.h> 68 #include <openssl/err.h> 69 #include <openssl/x509v3.h> 70 71 #include "rpctlssd.h" 72 #include "rpc.tlscommon.h" 73 74 #ifndef _PATH_RPCTLSSDSOCK 75 #define _PATH_RPCTLSSDSOCK "/var/run/rpc.tlsservd.sock" 76 #endif 77 #ifndef _PATH_CERTANDKEY 78 #define _PATH_CERTANDKEY "/etc/rpc.tlsservd/" 79 #endif 80 #ifndef _PATH_RPCTLSSDPID 81 #define _PATH_RPCTLSSDPID "/var/run/rpc.tlsservd.pid" 82 #endif 83 #ifndef _PREFERRED_CIPHERS 84 #define _PREFERRED_CIPHERS "AES128-GCM-SHA256" 85 #endif 86 87 /* Global variables also used by rpc.tlscommon.c. */ 88 int rpctls_debug_level; 89 bool rpctls_verbose; 90 SSL_CTX *rpctls_ctx = NULL; 91 const char *rpctls_verify_cafile = NULL; 92 const char *rpctls_verify_capath = NULL; 93 char *rpctls_crlfile = NULL; 94 bool rpctls_gothup = false; 95 struct ssl_list rpctls_ssllist; 96 97 static struct pidfh *rpctls_pfh = NULL; 98 static bool rpctls_do_mutual = false; 99 static const char *rpctls_certdir = _PATH_CERTANDKEY; 100 static bool rpctls_comparehost = false; 101 static unsigned int rpctls_wildcard = X509_CHECK_FLAG_NO_WILDCARDS; 102 static uint64_t rpctls_ssl_refno = 0; 103 static uint64_t rpctls_ssl_sec = 0; 104 static uint64_t rpctls_ssl_usec = 0; 105 static bool rpctls_cnuser = false; 106 static char *rpctls_dnsname; 107 static const char *rpctls_cnuseroid = "1.3.6.1.4.1.2238.1.1.1"; 108 static const char *rpctls_ciphers = NULL; 109 static int rpctls_mintls = TLS1_3_VERSION; 110 static int rpctls_procs = 1; 111 static char *rpctls_sockname[RPCTLS_SRV_MAXNPROCS]; 112 static pid_t rpctls_workers[RPCTLS_SRV_MAXNPROCS - 1]; 113 static bool rpctls_im_a_worker = false; 114 115 static void rpctls_cleanup_term(int sig); 116 static SSL_CTX *rpctls_setup_ssl(const char *certdir); 117 static SSL *rpctls_server(SSL_CTX *ctx, int s, 118 uint32_t *flags, uint32_t *uidp, 119 int *ngrps, uint32_t *gidp, X509 **certp); 120 static int rpctls_cnname(X509 *cert, uint32_t *uidp, 121 int *ngrps, uint32_t *gidp); 122 static char *rpctls_getdnsname(char *dnsname); 123 static void rpctls_huphandler(int sig __unused); 124 125 extern void rpctlssd_1(struct svc_req *rqstp, SVCXPRT *transp); 126 127 static struct option longopts[] = { 128 { "allowtls1_2", no_argument, NULL, '2' }, 129 { "ciphers", required_argument, NULL, 'C' }, 130 { "certdir", required_argument, NULL, 'D' }, 131 { "debuglevel", no_argument, NULL, 'd' }, 132 { "checkhost", no_argument, NULL, 'h' }, 133 { "verifylocs", required_argument, NULL, 'l' }, 134 { "mutualverf", no_argument, NULL, 'm' }, 135 { "numdaemons", required_argument, NULL, 'N' }, 136 { "domain", required_argument, NULL, 'n' }, 137 { "verifydir", required_argument, NULL, 'p' }, 138 { "crl", required_argument, NULL, 'r' }, 139 { "certuser", no_argument, NULL, 'u' }, 140 { "verbose", no_argument, NULL, 'v' }, 141 { "multiwild", no_argument, NULL, 'W' }, 142 { "singlewild", no_argument, NULL, 'w' }, 143 { NULL, 0, NULL, 0 } 144 }; 145 146 int 147 main(int argc, char **argv) 148 { 149 /* 150 * We provide an RPC service on a local-domain socket. The 151 * kernel rpctls code will upcall to this daemon to do the initial 152 * TLS handshake. 153 */ 154 struct sockaddr_un sun; 155 int ch, fd, i, mypos, oldmask; 156 SVCXPRT *xprt; 157 struct timeval tm; 158 struct timezone tz; 159 char hostname[MAXHOSTNAMELEN + 2]; 160 pid_t otherpid; 161 bool tls_enable; 162 size_t tls_enable_len; 163 sigset_t signew; 164 165 /* Check that another rpctlssd isn't already running. */ 166 rpctls_pfh = pidfile_open(_PATH_RPCTLSSDPID, 0600, &otherpid); 167 if (rpctls_pfh == NULL) { 168 if (errno == EEXIST) 169 errx(1, "rpctlssd already running, pid: %d.", otherpid); 170 warn("cannot open or create pidfile"); 171 } 172 173 /* Check to see that the ktls is enabled. */ 174 tls_enable_len = sizeof(tls_enable); 175 if (sysctlbyname("kern.ipc.tls.enable", &tls_enable, &tls_enable_len, 176 NULL, 0) != 0 || !tls_enable) 177 errx(1, "Kernel TLS not enabled"); 178 179 /* Get the time when this daemon is started. */ 180 gettimeofday(&tm, &tz); 181 rpctls_ssl_sec = tm.tv_sec; 182 rpctls_ssl_usec = tm.tv_usec; 183 184 /* Set the dns name for the server. */ 185 rpctls_dnsname = rpctls_getdnsname(hostname); 186 if (rpctls_dnsname == NULL) { 187 strcpy(hostname, "@default.domain"); 188 rpctls_dnsname = hostname; 189 } 190 191 /* Initialize socket names. */ 192 for (i = 0; i < RPCTLS_SRV_MAXNPROCS; i++) { 193 asprintf(&rpctls_sockname[i], "%s.%d", _PATH_RPCTLSSDSOCK, i); 194 if (rpctls_sockname[i] == NULL) 195 errx(1, "Cannot malloc socknames"); 196 } 197 198 rpctls_verbose = false; 199 while ((ch = getopt_long(argc, argv, "2C:D:dhl:N:n:mp:r:uvWw", longopts, 200 NULL)) != -1) { 201 switch (ch) { 202 case '2': 203 rpctls_mintls = TLS1_2_VERSION; 204 break; 205 case 'C': 206 rpctls_ciphers = optarg; 207 break; 208 case 'D': 209 rpctls_certdir = optarg; 210 break; 211 case 'd': 212 rpctls_debug_level++; 213 break; 214 case 'h': 215 rpctls_comparehost = true; 216 break; 217 case 'l': 218 rpctls_verify_cafile = optarg; 219 break; 220 case 'm': 221 rpctls_do_mutual = true; 222 break; 223 case 'N': 224 rpctls_procs = atoi(optarg); 225 if (rpctls_procs < 1 || 226 rpctls_procs > RPCTLS_SRV_MAXNPROCS) 227 errx(1, "numdaemons/-N must be between 1 and " 228 "%d", RPCTLS_SRV_MAXNPROCS); 229 break; 230 case 'n': 231 hostname[0] = '@'; 232 strlcpy(&hostname[1], optarg, MAXHOSTNAMELEN + 1); 233 rpctls_dnsname = hostname; 234 break; 235 case 'p': 236 rpctls_verify_capath = optarg; 237 break; 238 case 'r': 239 rpctls_crlfile = optarg; 240 break; 241 case 'u': 242 rpctls_cnuser = true; 243 break; 244 case 'v': 245 rpctls_verbose = true; 246 break; 247 case 'W': 248 if (rpctls_wildcard != X509_CHECK_FLAG_NO_WILDCARDS) 249 errx(1, "options -w and -W are mutually " 250 "exclusive"); 251 rpctls_wildcard = X509_CHECK_FLAG_MULTI_LABEL_WILDCARDS; 252 break; 253 case 'w': 254 if (rpctls_wildcard != X509_CHECK_FLAG_NO_WILDCARDS) 255 errx(1, "options -w and -W are mutually " 256 "exclusive"); 257 rpctls_wildcard = 0; 258 break; 259 default: 260 fprintf(stderr, "usage: %s " 261 "[-2/--allowtls1_2] " 262 "[-C/--ciphers available_ciphers] " 263 "[-D/--certdir certdir] [-d/--debuglevel] " 264 "[-h/--checkhost] " 265 "[-l/--verifylocs CAfile] [-m/--mutualverf] " 266 "[-N/--numdaemons num] " 267 "[-n/--domain domain_name] " 268 "[-p/--verifydir CApath] [-r/--crl CRLfile] " 269 "[-u/--certuser] [-v/--verbose] [-W/--multiwild] " 270 "[-w/--singlewild]\n", argv[0]); 271 exit(1); 272 } 273 } 274 if (rpctls_do_mutual && rpctls_verify_cafile == NULL && 275 rpctls_verify_capath == NULL) 276 errx(1, "-m requires the -l <CAfile> and/or " 277 "-p <CApath> options"); 278 if (rpctls_comparehost && (!rpctls_do_mutual || 279 (rpctls_verify_cafile == NULL && rpctls_verify_capath == NULL))) 280 errx(1, "-h requires the -m plus the " 281 "-l <CAfile> and/or -p <CApath> options"); 282 if (!rpctls_comparehost && rpctls_wildcard != 283 X509_CHECK_FLAG_NO_WILDCARDS) 284 errx(1, "The -w or -W options require the -h option"); 285 if (rpctls_cnuser && (!rpctls_do_mutual || 286 (rpctls_verify_cafile == NULL && rpctls_verify_capath == NULL))) 287 errx(1, "-u requires the -m plus the " 288 "-l <CAfile> and/or -p <CApath> options"); 289 290 if (modfind("krpc") < 0) { 291 /* Not present in kernel, try loading it */ 292 if (kldload("krpc") < 0 || modfind("krpc") < 0) 293 errx(1, "Kernel RPC is not available"); 294 } 295 296 for (i = 0; i < rpctls_procs - 1; i++) 297 rpctls_workers[i] = -1; 298 mypos = 0; 299 300 if (rpctls_debug_level == 0) { 301 /* 302 * Temporarily block SIGTERM and SIGCHLD, so workers[] can't 303 * end up bogus. 304 */ 305 sigemptyset(&signew); 306 sigaddset(&signew, SIGTERM); 307 sigaddset(&signew, SIGCHLD); 308 sigprocmask(SIG_BLOCK, &signew, NULL); 309 310 if (daemon(0, 0) != 0) 311 err(1, "Can't daemonize"); 312 signal(SIGINT, SIG_IGN); 313 signal(SIGQUIT, SIG_IGN); 314 } 315 signal(SIGPIPE, SIG_IGN); 316 signal(SIGHUP, rpctls_huphandler); 317 signal(SIGTERM, rpctls_cleanup_term); 318 signal(SIGCHLD, rpctls_cleanup_term); 319 320 pidfile_write(rpctls_pfh); 321 322 rpctls_syscall(RPCTLS_SYSC_SRVSTARTUP, ""); 323 324 if (rpctls_debug_level == 0) { 325 /* Fork off the worker daemons. */ 326 for (i = 0; i < rpctls_procs - 1; i++) { 327 rpctls_workers[i] = fork(); 328 if (rpctls_workers[i] == 0) { 329 rpctls_im_a_worker = true; 330 mypos = i + 1; 331 setproctitle("server"); 332 break; 333 } else if (rpctls_workers[i] < 0) { 334 syslog(LOG_ERR, "fork: %m"); 335 } 336 } 337 338 if (!rpctls_im_a_worker && rpctls_procs > 1) 339 setproctitle("master"); 340 } 341 sigemptyset(&signew); 342 sigaddset(&signew, SIGTERM); 343 sigaddset(&signew, SIGCHLD); 344 sigprocmask(SIG_UNBLOCK, &signew, NULL); 345 346 memset(&sun, 0, sizeof sun); 347 sun.sun_family = AF_LOCAL; 348 unlink(rpctls_sockname[mypos]); 349 strcpy(sun.sun_path, rpctls_sockname[mypos]); 350 sun.sun_len = SUN_LEN(&sun); 351 fd = socket(AF_LOCAL, SOCK_STREAM, 0); 352 if (fd < 0) { 353 if (rpctls_debug_level == 0) { 354 syslog(LOG_ERR, "Can't create local rpctlssd socket"); 355 exit(1); 356 } 357 err(1, "Can't create local rpctlssd socket"); 358 } 359 oldmask = umask(S_IXUSR|S_IRWXG|S_IRWXO); 360 if (bind(fd, (struct sockaddr *)&sun, sun.sun_len) < 0) { 361 if (rpctls_debug_level == 0) { 362 syslog(LOG_ERR, "Can't bind local rpctlssd socket"); 363 exit(1); 364 } 365 err(1, "Can't bind local rpctlssd socket"); 366 } 367 umask(oldmask); 368 if (listen(fd, SOMAXCONN) < 0) { 369 if (rpctls_debug_level == 0) { 370 syslog(LOG_ERR, 371 "Can't listen on local rpctlssd socket"); 372 exit(1); 373 } 374 err(1, "Can't listen on local rpctlssd socket"); 375 } 376 xprt = svc_vc_create(fd, RPC_MAXDATASIZE, RPC_MAXDATASIZE); 377 if (!xprt) { 378 if (rpctls_debug_level == 0) { 379 syslog(LOG_ERR, 380 "Can't create transport for local rpctlssd socket"); 381 exit(1); 382 } 383 err(1, "Can't create transport for local rpctlssd socket"); 384 } 385 if (!svc_reg(xprt, RPCTLSSD, RPCTLSSDVERS, rpctlssd_1, NULL)) { 386 if (rpctls_debug_level == 0) { 387 syslog(LOG_ERR, 388 "Can't register service for local rpctlssd socket"); 389 exit(1); 390 } 391 err(1, "Can't register service for local rpctlssd socket"); 392 } 393 394 rpctls_ctx = rpctls_setup_ssl(rpctls_certdir); 395 if (rpctls_ctx == NULL) { 396 if (rpctls_debug_level == 0) { 397 syslog(LOG_ERR, "Can't create SSL context"); 398 exit(1); 399 } 400 err(1, "Can't create SSL context"); 401 } 402 rpctls_gothup = false; 403 LIST_INIT(&rpctls_ssllist); 404 405 if (rpctls_syscall(RPCTLS_SYSC_SRVSETPATH, rpctls_sockname[mypos]) < 0){ 406 if (rpctls_debug_level == 0) { 407 syslog(LOG_ERR, 408 "Can't set upcall socket path=%s errno=%d", 409 rpctls_sockname[mypos], errno); 410 exit(1); 411 } 412 err(1, "Can't set upcall socket path=%s", 413 rpctls_sockname[mypos]); 414 } 415 416 rpctls_svc_run(); 417 418 SSL_CTX_free(rpctls_ctx); 419 return (0); 420 } 421 422 bool_t 423 rpctlssd_null_1_svc(__unused void *argp, __unused void *result, 424 __unused struct svc_req *rqstp) 425 { 426 427 rpctls_verbose_out("rpctlssd_null_svc: done\n"); 428 return (TRUE); 429 } 430 431 bool_t 432 rpctlssd_connect_1_svc(__unused void *argp, 433 struct rpctlssd_connect_res *result, __unused struct svc_req *rqstp) 434 { 435 int ngrps, s; 436 SSL *ssl; 437 uint32_t flags; 438 struct ssl_entry *newslp; 439 uint32_t uid; 440 uint32_t *gidp; 441 X509 *cert; 442 443 rpctls_verbose_out("rpctlsd_connect_svc: started\n"); 444 memset(result, 0, sizeof(*result)); 445 /* Get the socket fd from the kernel. */ 446 s = rpctls_syscall(RPCTLS_SYSC_SRVSOCKET, ""); 447 if (s < 0) 448 return (FALSE); 449 450 /* Do the server side of a TLS handshake. */ 451 gidp = calloc(NGROUPS, sizeof(*gidp)); 452 ssl = rpctls_server(rpctls_ctx, s, &flags, &uid, &ngrps, gidp, &cert); 453 if (ssl == NULL) { 454 free(gidp); 455 rpctls_verbose_out("rpctlssd_connect_svc: ssl " 456 "accept failed\n"); 457 /* 458 * For RPC-over-TLS, this upcall is expected 459 * to close off the socket upon handshake failure. 460 */ 461 close(s); 462 return (FALSE); 463 } else { 464 rpctls_verbose_out("rpctlssd_connect_svc: " 465 "succeeded flags=0x%x\n", flags); 466 result->flags = flags; 467 result->sec = rpctls_ssl_sec; 468 result->usec = rpctls_ssl_usec; 469 result->ssl = ++rpctls_ssl_refno; 470 /* Hard to believe this could ever wrap around.. */ 471 if (rpctls_ssl_refno == 0) 472 result->ssl = ++rpctls_ssl_refno; 473 if ((flags & RPCTLS_FLAGS_CERTUSER) != 0) { 474 result->uid = uid; 475 result->gid.gid_len = ngrps; 476 result->gid.gid_val = gidp; 477 } else { 478 result->uid = 0; 479 result->gid.gid_len = 0; 480 result->gid.gid_val = gidp; 481 } 482 } 483 484 /* Maintain list of all current SSL *'s */ 485 newslp = malloc(sizeof(*newslp)); 486 newslp->ssl = ssl; 487 newslp->s = s; 488 newslp->shutoff = false; 489 newslp->refno = rpctls_ssl_refno; 490 newslp->cert = cert; 491 LIST_INSERT_HEAD(&rpctls_ssllist, newslp, next); 492 return (TRUE); 493 } 494 495 bool_t 496 rpctlssd_handlerecord_1_svc(struct rpctlssd_handlerecord_arg *argp, 497 struct rpctlssd_handlerecord_res *result, __unused struct svc_req *rqstp) 498 { 499 struct ssl_entry *slp; 500 int ret; 501 char junk; 502 503 slp = NULL; 504 if (argp->sec == rpctls_ssl_sec && argp->usec == 505 rpctls_ssl_usec) { 506 LIST_FOREACH(slp, &rpctls_ssllist, next) { 507 if (slp->refno == argp->ssl) 508 break; 509 } 510 } 511 512 if (slp != NULL) { 513 rpctls_verbose_out("rpctlssd_handlerecord fd=%d\n", 514 slp->s); 515 /* 516 * An SSL_read() of 0 bytes should fail, but it should 517 * handle the non-application data record before doing so. 518 */ 519 ret = SSL_read(slp->ssl, &junk, 0); 520 if (ret <= 0) { 521 /* Check to see if this was a close alert. */ 522 ret = SSL_get_shutdown(slp->ssl); 523 if ((ret & (SSL_SENT_SHUTDOWN | 524 SSL_RECEIVED_SHUTDOWN)) == SSL_RECEIVED_SHUTDOWN) 525 SSL_shutdown(slp->ssl); 526 } else { 527 if (rpctls_debug_level == 0) 528 syslog(LOG_ERR, "SSL_read returned %d", ret); 529 else 530 fprintf(stderr, "SSL_read returned %d\n", ret); 531 } 532 result->reterr = RPCTLSERR_OK; 533 } else 534 result->reterr = RPCTLSERR_NOSSL; 535 return (TRUE); 536 } 537 538 bool_t 539 rpctlssd_disconnect_1_svc(struct rpctlssd_disconnect_arg *argp, 540 struct rpctlssd_disconnect_res *result, __unused struct svc_req *rqstp) 541 { 542 struct ssl_entry *slp; 543 int ret; 544 545 slp = NULL; 546 if (argp->sec == rpctls_ssl_sec && argp->usec == 547 rpctls_ssl_usec) { 548 LIST_FOREACH(slp, &rpctls_ssllist, next) { 549 if (slp->refno == argp->ssl) 550 break; 551 } 552 } 553 554 if (slp != NULL) { 555 rpctls_verbose_out("rpctlssd_disconnect fd=%d closed\n", 556 slp->s); 557 LIST_REMOVE(slp, next); 558 if (!slp->shutoff) { 559 ret = SSL_get_shutdown(slp->ssl); 560 /* 561 * Do an SSL_shutdown() unless a close alert has 562 * already been sent. 563 */ 564 if ((ret & SSL_SENT_SHUTDOWN) == 0) 565 SSL_shutdown(slp->ssl); 566 } 567 SSL_free(slp->ssl); 568 if (slp->cert != NULL) 569 X509_free(slp->cert); 570 /* 571 * For RPC-over-TLS, this upcall is expected 572 * to close off the socket. 573 */ 574 if (!slp->shutoff) 575 shutdown(slp->s, SHUT_WR); 576 close(slp->s); 577 free(slp); 578 result->reterr = RPCTLSERR_OK; 579 } else 580 result->reterr = RPCTLSERR_NOCLOSE; 581 return (TRUE); 582 } 583 584 int 585 rpctlssd_1_freeresult(__unused SVCXPRT *transp, xdrproc_t xdr_result, 586 caddr_t result) 587 { 588 rpctlssd_connect_res *res; 589 590 if (xdr_result == (xdrproc_t)xdr_rpctlssd_connect_res) { 591 res = (rpctlssd_connect_res *)(void *)result; 592 free(res->gid.gid_val); 593 } 594 return (TRUE); 595 } 596 597 /* 598 * cleanup_term() called via SIGTERM (or SIGCHLD if a child dies). 599 */ 600 static void 601 rpctls_cleanup_term(int sig) 602 { 603 struct ssl_entry *slp; 604 int i, cnt; 605 606 if (rpctls_im_a_worker && sig == SIGCHLD) 607 return; 608 LIST_FOREACH(slp, &rpctls_ssllist, next) 609 shutdown(slp->s, SHUT_RD); 610 SSL_CTX_free(rpctls_ctx); 611 EVP_cleanup(); 612 613 if (rpctls_im_a_worker) 614 exit(0); 615 616 /* I'm the server, so terminate the workers. */ 617 cnt = 0; 618 for (i = 0; i < rpctls_procs - 1; i++) { 619 if (rpctls_workers[i] != -1) { 620 cnt++; 621 kill(rpctls_workers[i], SIGTERM); 622 } 623 } 624 625 /* 626 * Wait for them to die. 627 */ 628 for (i = 0; i < cnt; i++) 629 wait3(NULL, 0, NULL); 630 631 rpctls_syscall(RPCTLS_SYSC_SRVSHUTDOWN, ""); 632 pidfile_remove(rpctls_pfh); 633 634 exit(0); 635 } 636 637 /* Allow the handshake to proceed. */ 638 static int 639 rpctls_verify_callback(__unused int preverify_ok, 640 __unused X509_STORE_CTX *x509_ctx) 641 { 642 643 return (1); 644 } 645 646 static SSL_CTX * 647 rpctls_setup_ssl(const char *certdir) 648 { 649 SSL_CTX *ctx; 650 char path[PATH_MAX]; 651 size_t len, rlen; 652 int ret; 653 654 ctx = SSL_CTX_new(TLS_server_method()); 655 if (ctx == NULL) { 656 rpctls_verbose_out("rpctls_setup_ssl: SSL_CTX_new failed\n"); 657 return (NULL); 658 } 659 660 if (rpctls_ciphers != NULL) { 661 /* 662 * Set available ciphers, since KERN_TLS only supports a 663 * few of them. Normally, not doing this should be ok, 664 * since the library defaults will work. 665 */ 666 ret = SSL_CTX_set_ciphersuites(ctx, rpctls_ciphers); 667 if (ret == 0) { 668 rpctls_verbose_out("rpctls_setup_ssl: " 669 "SSL_CTX_set_ciphersuites failed: %s\n", 670 rpctls_ciphers); 671 SSL_CTX_free(ctx); 672 return (NULL); 673 } 674 } 675 676 ret = SSL_CTX_set_min_proto_version(ctx, rpctls_mintls); 677 if (ret == 0) { 678 rpctls_verbose_out("rpctls_setup_ssl: " 679 "SSL_CTX_set_min_proto_version failed\n"); 680 SSL_CTX_free(ctx); 681 return (NULL); 682 } 683 ret = SSL_CTX_set_max_proto_version(ctx, TLS1_3_VERSION); 684 if (ret == 0) { 685 rpctls_verbose_out("rpctls_setup_ssl: " 686 "SSL_CTX_set_max_proto_version failed\n"); 687 SSL_CTX_free(ctx); 688 return (NULL); 689 } 690 691 /* Get the cert.pem and certkey.pem files from the directory certdir. */ 692 len = strlcpy(path, certdir, sizeof(path)); 693 rlen = sizeof(path) - len; 694 if (strlcpy(&path[len], "cert.pem", rlen) != 8) { 695 SSL_CTX_free(ctx); 696 return (NULL); 697 } 698 ret = SSL_CTX_use_certificate_file(ctx, path, SSL_FILETYPE_PEM); 699 if (ret != 1) { 700 rpctls_verbose_out("rpctls_setup_ssl: can't use certificate " 701 "file path=%s ret=%d\n", path, ret); 702 SSL_CTX_free(ctx); 703 return (NULL); 704 } 705 if (strlcpy(&path[len], "certkey.pem", rlen) != 11) { 706 SSL_CTX_free(ctx); 707 return (NULL); 708 } 709 ret = SSL_CTX_use_PrivateKey_file(ctx, path, SSL_FILETYPE_PEM); 710 if (ret != 1) { 711 rpctls_verbose_out("rpctls_setup_ssl: Can't use private " 712 "key path=%s ret=%d\n", path, ret); 713 SSL_CTX_free(ctx); 714 return (NULL); 715 } 716 717 /* Set Mutual authentication, as required. */ 718 if (rpctls_do_mutual) { 719 if (rpctls_verify_cafile != NULL || 720 rpctls_verify_capath != NULL) { 721 if (rpctls_crlfile != NULL) { 722 ret = rpctls_loadcrlfile(ctx); 723 if (ret == 0) { 724 rpctls_verbose_out("rpctls_setup_ssl:" 725 " Load CRLfile failed\n"); 726 SSL_CTX_free(ctx); 727 return (NULL); 728 } 729 } 730 #if OPENSSL_VERSION_NUMBER >= 0x30000000 731 ret = 1; 732 if (rpctls_verify_cafile != NULL) 733 ret = SSL_CTX_load_verify_file(ctx, 734 rpctls_verify_cafile); 735 if (ret != 0 && rpctls_verify_capath != NULL) 736 ret = SSL_CTX_load_verify_dir(ctx, 737 rpctls_verify_capath); 738 #else 739 ret = SSL_CTX_load_verify_locations(ctx, 740 rpctls_verify_cafile, rpctls_verify_capath); 741 #endif 742 if (ret == 0) { 743 rpctls_verbose_out("rpctls_setup_ssl: " 744 "Can't load verify locations\n"); 745 SSL_CTX_free(ctx); 746 return (NULL); 747 } 748 if (rpctls_verify_cafile != NULL) 749 SSL_CTX_set_client_CA_list(ctx, 750 SSL_load_client_CA_file( 751 rpctls_verify_cafile)); 752 } 753 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, 754 rpctls_verify_callback); 755 } 756 #ifdef SSL_OP_ENABLE_KTLS 757 SSL_CTX_set_options(ctx, SSL_OP_ENABLE_KTLS); 758 #endif 759 #ifdef SSL_MODE_NO_KTLS_TX 760 SSL_CTX_clear_mode(ctx, SSL_MODE_NO_KTLS_TX | SSL_MODE_NO_KTLS_RX); 761 #endif 762 return (ctx); 763 } 764 765 static SSL * 766 rpctls_server(SSL_CTX *ctx, int s, uint32_t *flags, uint32_t *uidp, 767 int *ngrps, uint32_t *gidp, X509 **certp) 768 { 769 SSL *ssl; 770 X509 *cert; 771 struct sockaddr *sad; 772 struct sockaddr_storage ad; 773 char hostnam[NI_MAXHOST]; 774 int gethostret, ret; 775 char *cp, *cp2; 776 long verfret; 777 778 *flags = 0; 779 *certp = NULL; 780 sad = (struct sockaddr *)&ad; 781 ssl = SSL_new(ctx); 782 if (ssl == NULL) { 783 rpctls_verbose_out("rpctls_server: SSL_new failed\n"); 784 return (NULL); 785 } 786 if (SSL_set_fd(ssl, s) != 1) { 787 rpctls_verbose_out("rpctls_server: SSL_set_fd failed\n"); 788 SSL_free(ssl); 789 return (NULL); 790 } 791 ret = SSL_accept(ssl); 792 if (ret != 1) { 793 rpctls_verbose_out("rpctls_server: SSL_accept " 794 "failed ret=%d\n", ret); 795 SSL_free(ssl); 796 return (NULL); 797 } 798 *flags |= RPCTLS_FLAGS_HANDSHAKE; 799 if (rpctls_verbose) { 800 gethostret = rpctls_gethost(s, sad, hostnam, sizeof(hostnam)); 801 if (gethostret == 0) 802 hostnam[0] = '\0'; 803 rpctls_verbose_out("rpctls_server: SSL handshake ok for host %s" 804 " <%s %s>\n", hostnam, SSL_get_version(ssl), 805 SSL_get_cipher(ssl)); 806 } 807 if (rpctls_do_mutual) { 808 #if OPENSSL_VERSION_NUMBER >= 0x30000000 809 cert = SSL_get1_peer_certificate(ssl); 810 #else 811 cert = SSL_get_peer_certificate(ssl); 812 #endif 813 if (cert != NULL) { 814 if (!rpctls_verbose) { 815 gethostret = rpctls_gethost(s, sad, hostnam, 816 sizeof(hostnam)); 817 if (gethostret == 0) 818 hostnam[0] = '\0'; 819 } 820 cp2 = X509_NAME_oneline( 821 X509_get_subject_name(cert), NULL, 0); 822 *flags |= RPCTLS_FLAGS_GOTCERT; 823 verfret = SSL_get_verify_result(ssl); 824 if (verfret != X509_V_OK) { 825 cp = X509_NAME_oneline( 826 X509_get_issuer_name(cert), NULL, 0); 827 if (rpctls_debug_level == 0) 828 syslog(LOG_INFO | LOG_DAEMON, 829 "rpctls_server: client IP %s " 830 "issuerName=%s subjectName=%s" 831 " verify failed %s\n", hostnam, 832 cp, cp2, 833 X509_verify_cert_error_string( 834 verfret)); 835 else 836 fprintf(stderr, 837 "rpctls_server: client IP %s " 838 "issuerName=%s subjectName=%s" 839 " verify failed %s\n", hostnam, 840 cp, cp2, 841 X509_verify_cert_error_string( 842 verfret)); 843 } 844 if (verfret == 845 X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT || 846 verfret == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN) 847 *flags |= RPCTLS_FLAGS_SELFSIGNED; 848 else if (verfret == X509_V_OK) { 849 if (rpctls_comparehost) { 850 ret = 0; 851 if (gethostret != 0) 852 ret = rpctls_checkhost(sad, 853 cert, rpctls_wildcard); 854 if (ret != 1) { 855 *flags |= 856 RPCTLS_FLAGS_DISABLED; 857 rpctls_verbose_out( 858 "rpctls_server: " 859 "checkhost " 860 "failed\n"); 861 } 862 } 863 if (rpctls_cnuser) { 864 ret = rpctls_cnname(cert, uidp, 865 ngrps, gidp); 866 if (ret != 0) 867 *flags |= RPCTLS_FLAGS_CERTUSER; 868 } 869 *flags |= RPCTLS_FLAGS_VERIFIED; 870 *certp = cert; 871 cert = NULL; 872 } 873 if (cert != NULL) 874 X509_free(cert); 875 } else 876 rpctls_verbose_out("rpctls_server: " 877 "No peer certificate\n"); 878 } 879 880 /* Check to see that ktls is working for the connection. */ 881 ret = BIO_get_ktls_send(SSL_get_wbio(ssl)); 882 rpctls_verbose_out("rpctls_server: BIO_get_ktls_send=%d\n", ret); 883 if (ret != 0) { 884 ret = BIO_get_ktls_recv(SSL_get_rbio(ssl)); 885 rpctls_verbose_out("rpctls_server: BIO_get_ktls_recv=%d\n", 886 ret); 887 } 888 if (ret == 0) { 889 if (rpctls_debug_level == 0) 890 syslog(LOG_ERR, "ktls not working"); 891 else 892 fprintf(stderr, "ktls not working\n"); 893 /* 894 * The handshake has completed, so all that can be 895 * done is disable the connection. 896 */ 897 *flags |= RPCTLS_FLAGS_DISABLED; 898 } 899 900 return (ssl); 901 } 902 903 /* 904 * Acquire the dnsname for this server. 905 */ 906 static char * 907 rpctls_getdnsname(char *hostname) 908 { 909 char *cp, *dnsname; 910 struct addrinfo *aip, hints; 911 int error; 912 913 dnsname = NULL; 914 if (gethostname(hostname, MAXHOSTNAMELEN) == 0) { 915 if ((cp = strchr(hostname, '.')) != NULL && 916 *(cp + 1) != '\0') { 917 *cp = '@'; 918 dnsname = cp; 919 } else { 920 memset((void *)&hints, 0, sizeof (hints)); 921 hints.ai_flags = AI_CANONNAME; 922 error = getaddrinfo(hostname, NULL, &hints, &aip); 923 if (error == 0) { 924 if (aip->ai_canonname != NULL && 925 (cp = strchr(aip->ai_canonname, '.')) != 926 NULL && *(cp + 1) != '\0') { 927 hostname[0] = '@'; 928 strlcpy(&hostname[1], cp + 1, 929 MAXHOSTNAMELEN + 1); 930 dnsname = hostname; 931 } 932 freeaddrinfo(aip); 933 } 934 } 935 } 936 return (dnsname); 937 } 938 939 /* 940 * Check for an otherName component of subjectAltName where the OID 941 * matches and the "domain" matches that of this server. 942 * If found, map "user" to a <uid, gidlist> for it. 943 */ 944 static int 945 rpctls_cnname(X509 *cert, uint32_t *uidp, int *ngrps, uint32_t *gidp) 946 { 947 char *cp, usern[1024 + 1]; 948 struct passwd *pwd; 949 gid_t gids[NGROUPS]; 950 int i, j; 951 GENERAL_NAMES *genlist; 952 GENERAL_NAME *genname; 953 OTHERNAME *val; 954 size_t slen; 955 956 /* First, find the otherName in the subjectAltName. */ 957 genlist = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL); 958 if (genlist == NULL) 959 return (0); 960 cp = NULL; 961 for (i = 0; i < sk_GENERAL_NAME_num(genlist); i++) { 962 genname = sk_GENERAL_NAME_value(genlist, i); 963 if (genname->type != GEN_OTHERNAME) 964 continue; 965 val = genname->d.otherName; 966 967 /* Check to see that it is the correct OID. */ 968 slen = i2t_ASN1_OBJECT(usern, sizeof(usern), val->type_id); 969 if (slen != strlen(rpctls_cnuseroid) || memcmp(usern, 970 rpctls_cnuseroid, slen) != 0) 971 continue; 972 973 /* Sanity check the otherName. */ 974 if (val->value->type != V_ASN1_UTF8STRING || 975 val->value->value.utf8string->length < 3 || 976 (size_t)val->value->value.utf8string->length > sizeof(usern) 977 - 1) { 978 rpctls_verbose_out("rpctls_cnname: invalid cnuser " 979 "type=%d\n", val->value->type); 980 continue; 981 } 982 983 /* Look for a "user" in the otherName */ 984 memcpy(usern, val->value->value.utf8string->data, 985 val->value->value.utf8string->length); 986 usern[val->value->value.utf8string->length] = '\0'; 987 988 /* Now, look for the @dnsname suffix in the commonName. */ 989 cp = strcasestr(usern, rpctls_dnsname); 990 if (cp == NULL) 991 continue; 992 if (*(cp + strlen(rpctls_dnsname)) != '\0') { 993 cp = NULL; 994 continue; 995 } 996 *cp = '\0'; 997 break; 998 } 999 if (cp == NULL) 1000 return (0); 1001 1002 /* See if the "user" is in the passwd database. */ 1003 pwd = getpwnam(usern); 1004 if (pwd == NULL) 1005 return (0); 1006 *uidp = pwd->pw_uid; 1007 *ngrps = NGROUPS; 1008 if (getgrouplist(pwd->pw_name, pwd->pw_gid, gids, ngrps) < 0) 1009 return (0); 1010 rpctls_verbose_out("mapped user=%s ngrps=%d uid=%d\n", pwd->pw_name, 1011 *ngrps, pwd->pw_uid); 1012 for (j = 0; j < *ngrps; j++) 1013 gidp[j] = gids[j]; 1014 return (1); 1015 } 1016 1017 static void 1018 rpctls_huphandler(int sig __unused) 1019 { 1020 1021 rpctls_gothup = true; 1022 } 1023