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 client 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/queue.h> 41 #include <sys/linker.h> 42 #include <sys/module.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 <signal.h> 52 #include <stdarg.h> 53 #include <stdbool.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <unistd.h> 58 59 #include <rpc/rpc.h> 60 #include <rpc/rpc_com.h> 61 #include <rpc/rpcsec_tls.h> 62 63 #include <openssl/opensslconf.h> 64 #include <openssl/bio.h> 65 #include <openssl/ssl.h> 66 #include <openssl/err.h> 67 #include <openssl/x509v3.h> 68 69 #include "rpctlscd.h" 70 #include "rpc.tlscommon.h" 71 72 #ifndef _PATH_RPCTLSCDSOCK 73 #define _PATH_RPCTLSCDSOCK "/var/run/rpc.tlsclntd.sock" 74 #endif 75 #ifndef _PATH_CERTANDKEY 76 #define _PATH_CERTANDKEY "/etc/rpc.tlsclntd/" 77 #endif 78 #ifndef _PATH_RPCTLSCDPID 79 #define _PATH_RPCTLSCDPID "/var/run/rpc.tlsclntd.pid" 80 #endif 81 82 /* Global variables also used by rpc.tlscommon.c. */ 83 int rpctls_debug_level; 84 bool rpctls_verbose; 85 SSL_CTX *rpctls_ctx = NULL; 86 const char *rpctls_verify_cafile = NULL; 87 const char *rpctls_verify_capath = NULL; 88 char *rpctls_crlfile = NULL; 89 bool rpctls_cert = false; 90 bool rpctls_gothup = false; 91 struct ssl_list rpctls_ssllist; 92 93 static struct pidfh *rpctls_pfh = NULL; 94 static const char *rpctls_certdir = _PATH_CERTANDKEY; 95 static const char *rpctls_ciphers = NULL; 96 static uint64_t rpctls_ssl_refno = 0; 97 static uint64_t rpctls_ssl_sec = 0; 98 static uint64_t rpctls_ssl_usec = 0; 99 static int rpctls_tlsvers = TLS1_3_VERSION; 100 101 static void rpctlscd_terminate(int); 102 static SSL_CTX *rpctls_setupcl_ssl(void); 103 static SSL *rpctls_connect(SSL_CTX *ctx, int s, char *certname, 104 u_int certlen, X509 **certp); 105 static void rpctls_huphandler(int sig __unused); 106 107 extern void rpctlscd_1(struct svc_req *rqstp, SVCXPRT *transp); 108 109 static struct option longopts[] = { 110 { "usetls1_2", no_argument, NULL, '2' }, 111 { "certdir", required_argument, NULL, 'D' }, 112 { "ciphers", required_argument, NULL, 'C' }, 113 { "debuglevel", no_argument, NULL, 'd' }, 114 { "verifylocs", required_argument, NULL, 'l' }, 115 { "mutualverf", no_argument, NULL, 'm' }, 116 { "verifydir", required_argument, NULL, 'p' }, 117 { "crl", required_argument, NULL, 'r' }, 118 { "verbose", no_argument, NULL, 'v' }, 119 { NULL, 0, NULL, 0 } 120 }; 121 122 int 123 main(int argc, char **argv) 124 { 125 /* 126 * We provide an RPC service on a local-domain socket. The 127 * kernel rpctls code will upcall to this daemon to do the initial 128 * TLS handshake. 129 */ 130 struct sockaddr_un sun; 131 int ch, fd, oldmask; 132 SVCXPRT *xprt; 133 bool tls_enable; 134 struct timeval tm; 135 struct timezone tz; 136 pid_t otherpid; 137 size_t tls_enable_len; 138 139 /* Check that another rpctlscd isn't already running. */ 140 rpctls_pfh = pidfile_open(_PATH_RPCTLSCDPID, 0600, &otherpid); 141 if (rpctls_pfh == NULL) { 142 if (errno == EEXIST) 143 errx(1, "rpctlscd already running, pid: %d.", otherpid); 144 warn("cannot open or create pidfile"); 145 } 146 147 /* Check to see that the ktls is enabled. */ 148 tls_enable_len = sizeof(tls_enable); 149 if (sysctlbyname("kern.ipc.tls.enable", &tls_enable, &tls_enable_len, 150 NULL, 0) != 0 || !tls_enable) 151 errx(1, "Kernel TLS not enabled"); 152 153 /* Get the time when this daemon is started. */ 154 gettimeofday(&tm, &tz); 155 rpctls_ssl_sec = tm.tv_sec; 156 rpctls_ssl_usec = tm.tv_usec; 157 158 rpctls_verbose = false; 159 while ((ch = getopt_long(argc, argv, "2C:D:dl:mp:r:v", longopts, 160 NULL)) != -1) { 161 switch (ch) { 162 case '2': 163 rpctls_tlsvers = TLS1_2_VERSION; 164 break; 165 case 'C': 166 rpctls_ciphers = optarg; 167 break; 168 case 'D': 169 rpctls_certdir = optarg; 170 break; 171 case 'd': 172 rpctls_debug_level++; 173 break; 174 case 'l': 175 rpctls_verify_cafile = optarg; 176 break; 177 case 'm': 178 rpctls_cert = true; 179 break; 180 case 'p': 181 rpctls_verify_capath = optarg; 182 break; 183 case 'r': 184 rpctls_crlfile = optarg; 185 break; 186 case 'v': 187 rpctls_verbose = true; 188 break; 189 default: 190 fprintf(stderr, "usage: %s " 191 "[-2/--usetls1_2] " 192 "[-C/--ciphers available_ciphers] " 193 "[-D/--certdir certdir] [-d/--debuglevel] " 194 "[-l/--verifylocs CAfile] [-m/--mutualverf] " 195 "[-p/--verifydir CApath] [-r/--crl CRLfile] " 196 "[-v/--verbose]\n", argv[0]); 197 exit(1); 198 break; 199 } 200 } 201 if (rpctls_crlfile != NULL && rpctls_verify_cafile == NULL && 202 rpctls_verify_capath == NULL) 203 errx(1, "-r requires the -l <CAfile> and/or " 204 "-p <CApath> options"); 205 206 if (modfind("krpc") < 0) { 207 /* Not present in kernel, try loading it */ 208 if (kldload("krpc") < 0 || modfind("krpc") < 0) 209 errx(1, "Kernel RPC is not available"); 210 } 211 212 /* 213 * Set up the SSL_CTX *. 214 * Do it now, before daemonizing, in case the private key 215 * is encrypted and requires a passphrase to be entered. 216 */ 217 rpctls_ctx = rpctls_setupcl_ssl(); 218 if (rpctls_ctx == NULL) { 219 if (rpctls_debug_level == 0) { 220 syslog(LOG_ERR, "Can't set up TLS context"); 221 exit(1); 222 } 223 err(1, "Can't set up TLS context"); 224 } 225 LIST_INIT(&rpctls_ssllist); 226 227 if (!rpctls_debug_level) { 228 if (daemon(0, 0) != 0) 229 err(1, "Can't daemonize"); 230 signal(SIGINT, SIG_IGN); 231 signal(SIGQUIT, SIG_IGN); 232 signal(SIGHUP, SIG_IGN); 233 } 234 signal(SIGTERM, rpctlscd_terminate); 235 signal(SIGPIPE, SIG_IGN); 236 signal(SIGHUP, rpctls_huphandler); 237 238 pidfile_write(rpctls_pfh); 239 240 memset(&sun, 0, sizeof sun); 241 sun.sun_family = AF_LOCAL; 242 unlink(_PATH_RPCTLSCDSOCK); 243 strcpy(sun.sun_path, _PATH_RPCTLSCDSOCK); 244 sun.sun_len = SUN_LEN(&sun); 245 fd = socket(AF_LOCAL, SOCK_STREAM, 0); 246 if (fd < 0) { 247 if (rpctls_debug_level == 0) { 248 syslog(LOG_ERR, "Can't create local rpctlscd socket"); 249 exit(1); 250 } 251 err(1, "Can't create local rpctlscd socket"); 252 } 253 oldmask = umask(S_IXUSR|S_IRWXG|S_IRWXO); 254 if (bind(fd, (struct sockaddr *)&sun, sun.sun_len) < 0) { 255 if (rpctls_debug_level == 0) { 256 syslog(LOG_ERR, "Can't bind local rpctlscd socket"); 257 exit(1); 258 } 259 err(1, "Can't bind local rpctlscd socket"); 260 } 261 umask(oldmask); 262 if (listen(fd, SOMAXCONN) < 0) { 263 if (rpctls_debug_level == 0) { 264 syslog(LOG_ERR, 265 "Can't listen on local rpctlscd socket"); 266 exit(1); 267 } 268 err(1, "Can't listen on local rpctlscd socket"); 269 } 270 xprt = svc_vc_create(fd, RPC_MAXDATASIZE, RPC_MAXDATASIZE); 271 if (!xprt) { 272 if (rpctls_debug_level == 0) { 273 syslog(LOG_ERR, 274 "Can't create transport for local rpctlscd socket"); 275 exit(1); 276 } 277 err(1, "Can't create transport for local rpctlscd socket"); 278 } 279 if (!svc_reg(xprt, RPCTLSCD, RPCTLSCDVERS, rpctlscd_1, NULL)) { 280 if (rpctls_debug_level == 0) { 281 syslog(LOG_ERR, 282 "Can't register service for local rpctlscd socket"); 283 exit(1); 284 } 285 err(1, "Can't register service for local rpctlscd socket"); 286 } 287 288 rpctls_syscall(RPCTLS_SYSC_CLSETPATH, _PATH_RPCTLSCDSOCK); 289 290 rpctls_svc_run(); 291 292 rpctls_syscall(RPCTLS_SYSC_CLSHUTDOWN, ""); 293 294 SSL_CTX_free(rpctls_ctx); 295 EVP_cleanup(); 296 return (0); 297 } 298 299 bool_t 300 rpctlscd_null_1_svc(__unused void *argp, __unused void *result, 301 __unused struct svc_req *rqstp) 302 { 303 304 rpctls_verbose_out("rpctlscd_null: done\n"); 305 return (TRUE); 306 } 307 308 bool_t 309 rpctlscd_connect_1_svc(struct rpctlscd_connect_arg *argp, 310 struct rpctlscd_connect_res *result, __unused struct svc_req *rqstp) 311 { 312 int s; 313 SSL *ssl; 314 struct ssl_entry *newslp; 315 X509 *cert; 316 317 rpctls_verbose_out("rpctlsd_connect: started\n"); 318 /* Get the socket fd from the kernel. */ 319 s = rpctls_syscall(RPCTLS_SYSC_CLSOCKET, ""); 320 if (s < 0) { 321 result->reterr = RPCTLSERR_NOSOCKET; 322 return (TRUE); 323 } 324 325 /* Do a TLS connect handshake. */ 326 ssl = rpctls_connect(rpctls_ctx, s, argp->certname.certname_val, 327 argp->certname.certname_len, &cert); 328 if (ssl == NULL) { 329 rpctls_verbose_out("rpctlsd_connect: can't do TLS " 330 "handshake\n"); 331 result->reterr = RPCTLSERR_NOSSL; 332 } else { 333 result->reterr = RPCTLSERR_OK; 334 result->sec = rpctls_ssl_sec; 335 result->usec = rpctls_ssl_usec; 336 result->ssl = ++rpctls_ssl_refno; 337 /* Hard to believe this will ever wrap around.. */ 338 if (rpctls_ssl_refno == 0) 339 result->ssl = ++rpctls_ssl_refno; 340 } 341 342 if (ssl == NULL) { 343 /* 344 * For RPC-over-TLS, this upcall is expected 345 * to close off the socket. 346 */ 347 close(s); 348 return (TRUE); 349 } 350 351 /* Maintain list of all current SSL *'s */ 352 newslp = malloc(sizeof(*newslp)); 353 newslp->refno = rpctls_ssl_refno; 354 newslp->s = s; 355 newslp->shutoff = false; 356 newslp->ssl = ssl; 357 newslp->cert = cert; 358 LIST_INSERT_HEAD(&rpctls_ssllist, newslp, next); 359 return (TRUE); 360 } 361 362 bool_t 363 rpctlscd_handlerecord_1_svc(struct rpctlscd_handlerecord_arg *argp, 364 struct rpctlscd_handlerecord_res *result, __unused struct svc_req *rqstp) 365 { 366 struct ssl_entry *slp; 367 int ret; 368 char junk; 369 370 slp = NULL; 371 if (argp->sec == rpctls_ssl_sec && argp->usec == 372 rpctls_ssl_usec) { 373 LIST_FOREACH(slp, &rpctls_ssllist, next) { 374 if (slp->refno == argp->ssl) 375 break; 376 } 377 } 378 379 if (slp != NULL) { 380 rpctls_verbose_out("rpctlscd_handlerecord fd=%d\n", 381 slp->s); 382 /* 383 * An SSL_read() of 0 bytes should fail, but it should 384 * handle the non-application data record before doing so. 385 */ 386 ret = SSL_read(slp->ssl, &junk, 0); 387 if (ret <= 0) { 388 /* Check to see if this was a close alert. */ 389 ret = SSL_get_shutdown(slp->ssl); 390 if ((ret & (SSL_SENT_SHUTDOWN | 391 SSL_RECEIVED_SHUTDOWN)) == SSL_RECEIVED_SHUTDOWN) 392 SSL_shutdown(slp->ssl); 393 } else { 394 if (rpctls_debug_level == 0) 395 syslog(LOG_ERR, "SSL_read returned %d", ret); 396 else 397 fprintf(stderr, "SSL_read returned %d\n", ret); 398 } 399 result->reterr = RPCTLSERR_OK; 400 } else 401 result->reterr = RPCTLSERR_NOSSL; 402 return (TRUE); 403 } 404 405 bool_t 406 rpctlscd_disconnect_1_svc(struct rpctlscd_disconnect_arg *argp, 407 struct rpctlscd_disconnect_res *result, __unused struct svc_req *rqstp) 408 { 409 struct ssl_entry *slp; 410 int ret; 411 412 slp = NULL; 413 if (argp->sec == rpctls_ssl_sec && argp->usec == 414 rpctls_ssl_usec) { 415 LIST_FOREACH(slp, &rpctls_ssllist, next) { 416 if (slp->refno == argp->ssl) 417 break; 418 } 419 } 420 421 if (slp != NULL) { 422 rpctls_verbose_out("rpctlscd_disconnect: fd=%d closed\n", 423 slp->s); 424 LIST_REMOVE(slp, next); 425 if (!slp->shutoff) { 426 ret = SSL_get_shutdown(slp->ssl); 427 /* 428 * Do an SSL_shutdown() unless a close alert has 429 * already been sent. 430 */ 431 if ((ret & SSL_SENT_SHUTDOWN) == 0) 432 SSL_shutdown(slp->ssl); 433 } 434 SSL_free(slp->ssl); 435 if (slp->cert != NULL) 436 X509_free(slp->cert); 437 /* 438 * For RPC-over-TLS, this upcall is expected 439 * to close off the socket. 440 */ 441 if (!slp->shutoff) 442 shutdown(slp->s, SHUT_WR); 443 close(slp->s); 444 free(slp); 445 result->reterr = RPCTLSERR_OK; 446 } else 447 result->reterr = RPCTLSERR_NOCLOSE; 448 return (TRUE); 449 } 450 451 int 452 rpctlscd_1_freeresult(__unused SVCXPRT *transp, __unused xdrproc_t xdr_result, 453 __unused caddr_t result) 454 { 455 456 return (TRUE); 457 } 458 459 static void 460 rpctlscd_terminate(int sig __unused) 461 { 462 463 rpctls_syscall(RPCTLS_SYSC_CLSHUTDOWN, ""); 464 pidfile_remove(rpctls_pfh); 465 exit(0); 466 } 467 468 static SSL_CTX * 469 rpctls_setupcl_ssl(void) 470 { 471 SSL_CTX *ctx; 472 char path[PATH_MAX]; 473 size_t len, rlen; 474 int ret; 475 476 SSL_library_init(); 477 SSL_load_error_strings(); 478 OpenSSL_add_all_algorithms(); 479 480 ctx = SSL_CTX_new(TLS_client_method()); 481 if (ctx == NULL) { 482 rpctls_verbose_out("rpctls_setupcl_ssl: SSL_CTX_new " 483 "failed\n"); 484 return (NULL); 485 } 486 SSL_CTX_set_ecdh_auto(ctx, 1); 487 488 if (rpctls_ciphers != NULL) { 489 /* 490 * Set available ciphers, since KERN_TLS only supports a 491 * few of them. 492 */ 493 ret = SSL_CTX_set_ciphersuites(ctx, rpctls_ciphers); 494 if (ret == 0) { 495 rpctls_verbose_out("rpctls_setupcl_ssl: " 496 "SSL_CTX_set_ciphersuites failed: %s\n", 497 rpctls_ciphers); 498 SSL_CTX_free(ctx); 499 return (NULL); 500 } 501 } 502 503 /* 504 * If rpctls_cert is true, a certificate and key exists in 505 * rpctls_certdir, so that it can do mutual authentication. 506 */ 507 if (rpctls_cert) { 508 /* Get the cert.pem and certkey.pem files. */ 509 len = strlcpy(path, rpctls_certdir, sizeof(path)); 510 rlen = sizeof(path) - len; 511 if (strlcpy(&path[len], "cert.pem", rlen) != 8) { 512 SSL_CTX_free(ctx); 513 return (NULL); 514 } 515 ret = SSL_CTX_use_certificate_file(ctx, path, 516 SSL_FILETYPE_PEM); 517 if (ret != 1) { 518 rpctls_verbose_out("rpctls_setupcl_ssl: can't use " 519 "certificate file path=%s ret=%d\n", path, ret); 520 SSL_CTX_free(ctx); 521 return (NULL); 522 } 523 if (strlcpy(&path[len], "certkey.pem", rlen) != 11) { 524 SSL_CTX_free(ctx); 525 return (NULL); 526 } 527 ret = SSL_CTX_use_PrivateKey_file(ctx, path, 528 SSL_FILETYPE_PEM); 529 if (ret != 1) { 530 rpctls_verbose_out("rpctls_setupcl_ssl: Can't use " 531 "private key path=%s ret=%d\n", path, ret); 532 SSL_CTX_free(ctx); 533 return (NULL); 534 } 535 } 536 537 if (rpctls_verify_cafile != NULL || rpctls_verify_capath != NULL) { 538 if (rpctls_crlfile != NULL) { 539 ret = rpctls_loadcrlfile(ctx); 540 if (ret == 0) { 541 rpctls_verbose_out("rpctls_setupcl_ssl: " 542 "Load CRLfile failed\n"); 543 SSL_CTX_free(ctx); 544 return (NULL); 545 } 546 } 547 #if OPENSSL_VERSION_NUMBER >= 0x30000000 548 ret = 1; 549 if (rpctls_verify_cafile != NULL) 550 ret = SSL_CTX_load_verify_file(ctx, 551 rpctls_verify_cafile); 552 if (ret != 0 && rpctls_verify_capath != NULL) 553 ret = SSL_CTX_load_verify_dir(ctx, 554 rpctls_verify_capath); 555 #else 556 ret = SSL_CTX_load_verify_locations(ctx, 557 rpctls_verify_cafile, rpctls_verify_capath); 558 #endif 559 if (ret == 0) { 560 rpctls_verbose_out("rpctls_setupcl_ssl: " 561 "Can't load verify locations\n"); 562 SSL_CTX_free(ctx); 563 return (NULL); 564 } 565 /* 566 * The man page says that the 567 * SSL_CTX_set0_CA_list() call is not normally 568 * needed, but I believe it is harmless. 569 */ 570 if (rpctls_verify_cafile != NULL) 571 SSL_CTX_set0_CA_list(ctx, 572 SSL_load_client_CA_file(rpctls_verify_cafile)); 573 } 574 575 /* 576 * The RFC specifies that RPC-over-TLS must use TLS1.3. 577 * However, early FreeBSD versions (13.0, 13.1) did not 578 * support RX for KTLS1.3, so TLS1.2 needs to be used for 579 * these servers. 580 */ 581 ret = SSL_CTX_set_min_proto_version(ctx, rpctls_tlsvers); 582 if (ret == 0) { 583 rpctls_verbose_out("rpctls_setupcl_ssl: " 584 "SSL_CTX_set_min_proto_version failed\n"); 585 SSL_CTX_free(ctx); 586 return (NULL); 587 } 588 ret = SSL_CTX_set_max_proto_version(ctx, rpctls_tlsvers); 589 if (ret == 0) { 590 rpctls_verbose_out("rpctls_setupcl_ssl: " 591 "SSL_CTX_set_max_proto_version failed\n"); 592 SSL_CTX_free(ctx); 593 return (NULL); 594 } 595 596 #ifdef SSL_OP_ENABLE_KTLS 597 SSL_CTX_set_options(ctx, SSL_OP_ENABLE_KTLS); 598 #endif 599 #ifdef SSL_MODE_NO_KTLS_TX 600 SSL_CTX_clear_mode(ctx, SSL_MODE_NO_KTLS_TX | SSL_MODE_NO_KTLS_RX); 601 #endif 602 return (ctx); 603 } 604 605 static SSL * 606 rpctls_connect(SSL_CTX *ctx, int s, char *certname, u_int certlen, X509 **certp) 607 { 608 SSL *ssl; 609 X509 *cert; 610 struct sockaddr_storage ad; 611 struct sockaddr *sad; 612 char hostnam[NI_MAXHOST], path[PATH_MAX]; 613 int gethostret, ret; 614 char *cp, *cp2; 615 size_t len, rlen; 616 long verfret; 617 618 *certp = NULL; 619 sad = (struct sockaddr *)&ad; 620 ssl = SSL_new(ctx); 621 if (ssl == NULL) { 622 rpctls_verbose_out("rpctls_connect: " 623 "SSL_new failed\n"); 624 return (NULL); 625 } 626 if (SSL_set_fd(ssl, s) != 1) { 627 rpctls_verbose_out("rpctls_connect: " 628 "SSL_set_fd failed\n"); 629 SSL_free(ssl); 630 return (NULL); 631 } 632 633 /* 634 * If rpctls_cert is true and certname is set, a alternate certificate 635 * and key exists in files named <certname>.pem and <certname>key.pem 636 * in rpctls_certdir that is to be used for mutual authentication. 637 */ 638 if (rpctls_cert && certlen > 0) { 639 len = strlcpy(path, rpctls_certdir, sizeof(path)); 640 rlen = sizeof(path) - len; 641 if (rlen <= certlen) { 642 SSL_free(ssl); 643 return (NULL); 644 } 645 memcpy(&path[len], certname, certlen); 646 rlen -= certlen; 647 len += certlen; 648 path[len] = '\0'; 649 if (strlcpy(&path[len], ".pem", rlen) != 4) { 650 SSL_free(ssl); 651 return (NULL); 652 } 653 ret = SSL_use_certificate_file(ssl, path, SSL_FILETYPE_PEM); 654 if (ret != 1) { 655 rpctls_verbose_out("rpctls_connect: can't use " 656 "certificate file path=%s ret=%d\n", path, ret); 657 SSL_free(ssl); 658 return (NULL); 659 } 660 if (strlcpy(&path[len], "key.pem", rlen) != 7) { 661 SSL_free(ssl); 662 return (NULL); 663 } 664 ret = SSL_use_PrivateKey_file(ssl, path, SSL_FILETYPE_PEM); 665 if (ret != 1) { 666 rpctls_verbose_out("rpctls_connect: Can't use " 667 "private key path=%s ret=%d\n", path, ret); 668 SSL_free(ssl); 669 return (NULL); 670 } 671 } 672 673 ret = SSL_connect(ssl); 674 if (ret != 1) { 675 rpctls_verbose_out("rpctls_connect: " 676 "SSL_connect failed %d\n", 677 ret); 678 SSL_free(ssl); 679 return (NULL); 680 } 681 682 cert = SSL_get_peer_certificate(ssl); 683 if (cert == NULL) { 684 rpctls_verbose_out("rpctls_connect: get peer" 685 " certificate failed\n"); 686 SSL_free(ssl); 687 return (NULL); 688 } 689 gethostret = rpctls_gethost(s, sad, hostnam, sizeof(hostnam)); 690 if (gethostret == 0) 691 hostnam[0] = '\0'; 692 verfret = SSL_get_verify_result(ssl); 693 if (verfret == X509_V_OK && (rpctls_verify_cafile != NULL || 694 rpctls_verify_capath != NULL) && (gethostret == 0 || 695 rpctls_checkhost(sad, cert, X509_CHECK_FLAG_NO_WILDCARDS) != 1)) 696 verfret = X509_V_ERR_HOSTNAME_MISMATCH; 697 if (verfret != X509_V_OK && (rpctls_verify_cafile != NULL || 698 rpctls_verify_capath != NULL)) { 699 if (verfret != X509_V_OK) { 700 cp = X509_NAME_oneline(X509_get_issuer_name(cert), 701 NULL, 0); 702 cp2 = X509_NAME_oneline(X509_get_subject_name(cert), 703 NULL, 0); 704 if (rpctls_debug_level == 0) 705 syslog(LOG_INFO | LOG_DAEMON, 706 "rpctls_connect: client IP %s " 707 "issuerName=%s subjectName=%s verify " 708 "failed %s\n", hostnam, cp, cp2, 709 X509_verify_cert_error_string(verfret)); 710 else 711 fprintf(stderr, 712 "rpctls_connect: client IP %s " 713 "issuerName=%s subjectName=%s verify " 714 "failed %s\n", hostnam, cp, cp2, 715 X509_verify_cert_error_string(verfret)); 716 } 717 X509_free(cert); 718 SSL_free(ssl); 719 return (NULL); 720 } 721 722 /* Check to see if ktls is enabled on the connection. */ 723 ret = BIO_get_ktls_send(SSL_get_wbio(ssl)); 724 rpctls_verbose_out("rpctls_connect: BIO_get_ktls_send=%d\n", ret); 725 if (ret != 0) { 726 ret = BIO_get_ktls_recv(SSL_get_rbio(ssl)); 727 rpctls_verbose_out("rpctls_connect: BIO_get_ktls_recv=%d\n", 728 ret); 729 } 730 if (ret == 0) { 731 if (rpctls_debug_level == 0) 732 syslog(LOG_ERR, "ktls not working\n"); 733 else 734 fprintf(stderr, "ktls not working\n"); 735 X509_free(cert); 736 SSL_free(ssl); 737 return (NULL); 738 } 739 if (ret == X509_V_OK && (rpctls_verify_cafile != NULL || 740 rpctls_verify_capath != NULL) && rpctls_crlfile != NULL) 741 *certp = cert; 742 else 743 X509_free(cert); 744 745 return (ssl); 746 } 747 748 static void 749 rpctls_huphandler(int sig __unused) 750 { 751 752 rpctls_gothup = true; 753 } 754