1 /*- 2 * Copyright (c) 2008 Isilon Inc http://www.isilon.com/ 3 * Authors: Doug Rabson <dfr@rabson.org> 4 * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/stat.h> 33 #include <sys/linker.h> 34 #include <sys/module.h> 35 #include <sys/queue.h> 36 #include <sys/syslog.h> 37 #include <ctype.h> 38 #include <dirent.h> 39 #include <err.h> 40 #include <errno.h> 41 #ifndef WITHOUT_KERBEROS 42 #include <krb5.h> 43 #endif 44 #include <pwd.h> 45 #include <signal.h> 46 #include <stdarg.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <unistd.h> 51 #include <gssapi/gssapi.h> 52 #include <rpc/rpc.h> 53 #include <rpc/rpc_com.h> 54 55 #include "gssd.h" 56 57 #ifndef _PATH_GSS_MECH 58 #define _PATH_GSS_MECH "/etc/gss/mech" 59 #endif 60 #ifndef _PATH_GSSDSOCK 61 #define _PATH_GSSDSOCK "/var/run/gssd.sock" 62 #endif 63 #define GSSD_CREDENTIAL_CACHE_FILE "/tmp/krb5cc_gssd" 64 65 struct gss_resource { 66 LIST_ENTRY(gss_resource) gr_link; 67 uint64_t gr_id; /* indentifier exported to kernel */ 68 void* gr_res; /* GSS-API resource pointer */ 69 }; 70 LIST_HEAD(gss_resource_list, gss_resource) gss_resources; 71 int gss_resource_count; 72 uint32_t gss_next_id; 73 uint32_t gss_start_time; 74 int debug_level; 75 static char ccfile_dirlist[PATH_MAX + 1], ccfile_substring[NAME_MAX + 1]; 76 static char pref_realm[1024]; 77 static int verbose; 78 static int use_old_des; 79 static int hostbased_initiator_cred; 80 #ifndef WITHOUT_KERBEROS 81 /* 1.2.752.43.13.14 */ 82 static gss_OID_desc gss_krb5_set_allowable_enctypes_x_desc = 83 {6, (void *) "\x2a\x85\x70\x2b\x0d\x0e"}; 84 static gss_OID GSS_KRB5_SET_ALLOWABLE_ENCTYPES_X = 85 &gss_krb5_set_allowable_enctypes_x_desc; 86 static gss_OID_desc gss_krb5_mech_oid_x_desc = 87 {9, (void *) "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02" }; 88 static gss_OID GSS_KRB5_MECH_OID_X = 89 &gss_krb5_mech_oid_x_desc; 90 #endif 91 92 static void gssd_load_mech(void); 93 static int find_ccache_file(const char *, uid_t, char *); 94 static int is_a_valid_tgt_cache(const char *, uid_t, int *, time_t *); 95 static void gssd_verbose_out(const char *, ...); 96 #ifndef WITHOUT_KERBEROS 97 static krb5_error_code gssd_get_cc_from_keytab(const char *); 98 static OM_uint32 gssd_get_user_cred(OM_uint32 *, uid_t, gss_cred_id_t *); 99 #endif 100 void gssd_terminate(int); 101 102 extern void gssd_1(struct svc_req *rqstp, SVCXPRT *transp); 103 extern int gssd_syscall(char *path); 104 105 int 106 main(int argc, char **argv) 107 { 108 /* 109 * We provide an RPC service on a local-domain socket. The 110 * kernel's GSS-API code will pass what it can't handle 111 * directly to us. 112 */ 113 struct sockaddr_un sun; 114 int fd, oldmask, ch, debug; 115 SVCXPRT *xprt; 116 117 /* 118 * Initialize the credential cache file name substring and the 119 * search directory list. 120 */ 121 strlcpy(ccfile_substring, "krb5cc_", sizeof(ccfile_substring)); 122 ccfile_dirlist[0] = '\0'; 123 pref_realm[0] = '\0'; 124 debug = 0; 125 verbose = 0; 126 while ((ch = getopt(argc, argv, "dhovs:c:r:")) != -1) { 127 switch (ch) { 128 case 'd': 129 debug_level++; 130 break; 131 case 'h': 132 #ifndef WITHOUT_KERBEROS 133 /* 134 * Enable use of a host based initiator credential 135 * in the default keytab file. 136 */ 137 hostbased_initiator_cred = 1; 138 #else 139 errx(1, "This option not available when built" 140 " without MK_KERBEROS\n"); 141 #endif 142 break; 143 case 'o': 144 #ifndef WITHOUT_KERBEROS 145 /* 146 * Force use of DES and the old type of GSSAPI token. 147 */ 148 use_old_des = 1; 149 #else 150 errx(1, "This option not available when built" 151 " without MK_KERBEROS\n"); 152 #endif 153 break; 154 case 'v': 155 verbose = 1; 156 break; 157 case 's': 158 #ifndef WITHOUT_KERBEROS 159 /* 160 * Set the directory search list. This enables use of 161 * find_ccache_file() to search the directories for a 162 * suitable credentials cache file. 163 */ 164 strlcpy(ccfile_dirlist, optarg, sizeof(ccfile_dirlist)); 165 #else 166 errx(1, "This option not available when built" 167 " without MK_KERBEROS\n"); 168 #endif 169 break; 170 case 'c': 171 /* 172 * Specify a non-default credential cache file 173 * substring. 174 */ 175 strlcpy(ccfile_substring, optarg, 176 sizeof(ccfile_substring)); 177 break; 178 case 'r': 179 /* 180 * Set the preferred realm for the credential cache tgt. 181 */ 182 strlcpy(pref_realm, optarg, sizeof(pref_realm)); 183 break; 184 default: 185 fprintf(stderr, 186 "usage: %s [-d] [-s dir-list] [-c file-substring]" 187 " [-r preferred-realm]\n", argv[0]); 188 exit(1); 189 break; 190 } 191 } 192 193 gssd_load_mech(); 194 195 if (!debug_level) { 196 if (daemon(0, 0) != 0) 197 err(1, "Can't daemonize"); 198 signal(SIGINT, SIG_IGN); 199 signal(SIGQUIT, SIG_IGN); 200 signal(SIGHUP, SIG_IGN); 201 } 202 signal(SIGTERM, gssd_terminate); 203 204 memset(&sun, 0, sizeof sun); 205 sun.sun_family = AF_LOCAL; 206 unlink(_PATH_GSSDSOCK); 207 strcpy(sun.sun_path, _PATH_GSSDSOCK); 208 sun.sun_len = SUN_LEN(&sun); 209 fd = socket(AF_LOCAL, SOCK_STREAM, 0); 210 if (fd < 0) { 211 if (debug_level == 0) { 212 syslog(LOG_ERR, "Can't create local gssd socket"); 213 exit(1); 214 } 215 err(1, "Can't create local gssd socket"); 216 } 217 oldmask = umask(S_IXUSR|S_IRWXG|S_IRWXO); 218 if (bind(fd, (struct sockaddr *) &sun, sun.sun_len) < 0) { 219 if (debug_level == 0) { 220 syslog(LOG_ERR, "Can't bind local gssd socket"); 221 exit(1); 222 } 223 err(1, "Can't bind local gssd socket"); 224 } 225 umask(oldmask); 226 if (listen(fd, SOMAXCONN) < 0) { 227 if (debug_level == 0) { 228 syslog(LOG_ERR, "Can't listen on local gssd socket"); 229 exit(1); 230 } 231 err(1, "Can't listen on local gssd socket"); 232 } 233 xprt = svc_vc_create(fd, RPC_MAXDATASIZE, RPC_MAXDATASIZE); 234 if (!xprt) { 235 if (debug_level == 0) { 236 syslog(LOG_ERR, 237 "Can't create transport for local gssd socket"); 238 exit(1); 239 } 240 err(1, "Can't create transport for local gssd socket"); 241 } 242 if (!svc_reg(xprt, GSSD, GSSDVERS, gssd_1, NULL)) { 243 if (debug_level == 0) { 244 syslog(LOG_ERR, 245 "Can't register service for local gssd socket"); 246 exit(1); 247 } 248 err(1, "Can't register service for local gssd socket"); 249 } 250 251 LIST_INIT(&gss_resources); 252 gss_next_id = 1; 253 gss_start_time = time(0); 254 255 gssd_syscall(_PATH_GSSDSOCK); 256 svc_run(); 257 258 return (0); 259 } 260 261 static void 262 gssd_load_mech(void) 263 { 264 FILE *fp; 265 char buf[256]; 266 char *p; 267 char *name, *oid, *lib, *kobj; 268 269 fp = fopen(_PATH_GSS_MECH, "r"); 270 if (!fp) 271 return; 272 273 while (fgets(buf, sizeof(buf), fp)) { 274 if (*buf == '#') 275 continue; 276 p = buf; 277 name = strsep(&p, "\t\n "); 278 if (p) while (isspace(*p)) p++; 279 oid = strsep(&p, "\t\n "); 280 if (p) while (isspace(*p)) p++; 281 lib = strsep(&p, "\t\n "); 282 if (p) while (isspace(*p)) p++; 283 kobj = strsep(&p, "\t\n "); 284 if (!name || !oid || !lib || !kobj) 285 continue; 286 287 if (strcmp(kobj, "-")) { 288 /* 289 * Attempt to load the kernel module if its 290 * not already present. 291 */ 292 if (modfind(kobj) < 0) { 293 if (kldload(kobj) < 0) { 294 fprintf(stderr, 295 "%s: can't find or load kernel module %s for %s\n", 296 getprogname(), kobj, name); 297 } 298 } 299 } 300 } 301 fclose(fp); 302 } 303 304 static void * 305 gssd_find_resource(uint64_t id) 306 { 307 struct gss_resource *gr; 308 309 if (!id) 310 return (NULL); 311 312 LIST_FOREACH(gr, &gss_resources, gr_link) 313 if (gr->gr_id == id) 314 return (gr->gr_res); 315 316 return (NULL); 317 } 318 319 static uint64_t 320 gssd_make_resource(void *res) 321 { 322 struct gss_resource *gr; 323 324 if (!res) 325 return (0); 326 327 gr = malloc(sizeof(struct gss_resource)); 328 if (!gr) 329 return (0); 330 gr->gr_id = (gss_next_id++) + ((uint64_t) gss_start_time << 32); 331 gr->gr_res = res; 332 LIST_INSERT_HEAD(&gss_resources, gr, gr_link); 333 gss_resource_count++; 334 if (debug_level > 1) 335 printf("%d resources allocated\n", gss_resource_count); 336 337 return (gr->gr_id); 338 } 339 340 static void 341 gssd_delete_resource(uint64_t id) 342 { 343 struct gss_resource *gr; 344 345 LIST_FOREACH(gr, &gss_resources, gr_link) { 346 if (gr->gr_id == id) { 347 LIST_REMOVE(gr, gr_link); 348 free(gr); 349 gss_resource_count--; 350 if (debug_level > 1) 351 printf("%d resources allocated\n", 352 gss_resource_count); 353 return; 354 } 355 } 356 } 357 358 static void 359 gssd_verbose_out(const char *fmt, ...) 360 { 361 va_list ap; 362 363 if (verbose != 0) { 364 va_start(ap, fmt); 365 if (debug_level == 0) 366 vsyslog(LOG_INFO | LOG_DAEMON, fmt, ap); 367 else 368 vfprintf(stderr, fmt, ap); 369 va_end(ap); 370 } 371 } 372 373 bool_t 374 gssd_null_1_svc(void *argp, void *result, struct svc_req *rqstp) 375 { 376 377 gssd_verbose_out("gssd_null: done\n"); 378 return (TRUE); 379 } 380 381 bool_t 382 gssd_init_sec_context_1_svc(init_sec_context_args *argp, init_sec_context_res *result, struct svc_req *rqstp) 383 { 384 gss_cred_id_t cred = GSS_C_NO_CREDENTIAL; 385 gss_ctx_id_t ctx = GSS_C_NO_CONTEXT; 386 gss_name_t name = GSS_C_NO_NAME; 387 char ccname[PATH_MAX + 5 + 1], *cp, *cp2; 388 int gotone, gotcred; 389 OM_uint32 min_stat; 390 #ifndef WITHOUT_KERBEROS 391 gss_buffer_desc principal_desc; 392 char enctype[sizeof(uint32_t)]; 393 int key_enctype; 394 OM_uint32 maj_stat; 395 #endif 396 397 memset(result, 0, sizeof(*result)); 398 if (hostbased_initiator_cred != 0 && argp->cred != 0 && 399 argp->uid == 0) { 400 /* 401 * These credentials are for a host based initiator name 402 * in a keytab file, which should now have credentials 403 * in /tmp/krb5cc_gssd, because gss_acquire_cred() did 404 * the equivalent of "kinit -k". 405 */ 406 snprintf(ccname, sizeof(ccname), "FILE:%s", 407 GSSD_CREDENTIAL_CACHE_FILE); 408 } else if (ccfile_dirlist[0] != '\0' && argp->cred == 0) { 409 /* 410 * For the "-s" case and no credentials provided as an 411 * argument, search the directory list for an appropriate 412 * credential cache file. If the search fails, return failure. 413 */ 414 gotone = 0; 415 cp = ccfile_dirlist; 416 do { 417 cp2 = strchr(cp, ':'); 418 if (cp2 != NULL) 419 *cp2 = '\0'; 420 gotone = find_ccache_file(cp, argp->uid, ccname); 421 if (gotone != 0) 422 break; 423 if (cp2 != NULL) 424 *cp2++ = ':'; 425 cp = cp2; 426 } while (cp != NULL && *cp != '\0'); 427 if (gotone == 0) { 428 result->major_status = GSS_S_CREDENTIALS_EXPIRED; 429 gssd_verbose_out("gssd_init_sec_context: -s no" 430 " credential cache file found for uid=%d\n", 431 (int)argp->uid); 432 return (TRUE); 433 } 434 } else { 435 /* 436 * If there wasn't a "-s" option or the credentials have 437 * been provided as an argument, do it the old way. 438 * When credentials are provided, the uid should be root. 439 */ 440 if (argp->cred != 0 && argp->uid != 0) { 441 if (debug_level == 0) 442 syslog(LOG_ERR, "gss_init_sec_context:" 443 " cred for non-root"); 444 else 445 fprintf(stderr, "gss_init_sec_context:" 446 " cred for non-root\n"); 447 } 448 snprintf(ccname, sizeof(ccname), "FILE:/tmp/krb5cc_%d", 449 (int) argp->uid); 450 } 451 setenv("KRB5CCNAME", ccname, TRUE); 452 453 if (argp->cred) { 454 cred = gssd_find_resource(argp->cred); 455 if (!cred) { 456 result->major_status = GSS_S_CREDENTIALS_EXPIRED; 457 gssd_verbose_out("gssd_init_sec_context: cred" 458 " resource not found\n"); 459 return (TRUE); 460 } 461 } 462 if (argp->ctx) { 463 ctx = gssd_find_resource(argp->ctx); 464 if (!ctx) { 465 result->major_status = GSS_S_CONTEXT_EXPIRED; 466 gssd_verbose_out("gssd_init_sec_context: context" 467 " resource not found\n"); 468 return (TRUE); 469 } 470 } 471 if (argp->name) { 472 name = gssd_find_resource(argp->name); 473 if (!name) { 474 result->major_status = GSS_S_BAD_NAME; 475 gssd_verbose_out("gssd_init_sec_context: name" 476 " resource not found\n"); 477 return (TRUE); 478 } 479 } 480 gotcred = 0; 481 482 #ifndef WITHOUT_KERBEROS 483 if (use_old_des != 0) { 484 if (cred == GSS_C_NO_CREDENTIAL) { 485 /* Acquire a credential for the uid. */ 486 maj_stat = gssd_get_user_cred(&min_stat, argp->uid, 487 &cred); 488 if (maj_stat == GSS_S_COMPLETE) 489 gotcred = 1; 490 else 491 gssd_verbose_out("gssd_init_sec_context: " 492 "get user cred failed uid=%d major=0x%x " 493 "minor=%d\n", (int)argp->uid, 494 (unsigned int)maj_stat, (int)min_stat); 495 } 496 if (cred != GSS_C_NO_CREDENTIAL) { 497 key_enctype = ETYPE_DES_CBC_CRC; 498 enctype[0] = (key_enctype >> 24) & 0xff; 499 enctype[1] = (key_enctype >> 16) & 0xff; 500 enctype[2] = (key_enctype >> 8) & 0xff; 501 enctype[3] = key_enctype & 0xff; 502 principal_desc.length = sizeof(enctype); 503 principal_desc.value = enctype; 504 result->major_status = gss_set_cred_option( 505 &result->minor_status, &cred, 506 GSS_KRB5_SET_ALLOWABLE_ENCTYPES_X, 507 &principal_desc); 508 gssd_verbose_out("gssd_init_sec_context: set allowable " 509 "enctype major=0x%x minor=%d\n", 510 (unsigned int)result->major_status, 511 (int)result->minor_status); 512 if (result->major_status != GSS_S_COMPLETE) { 513 if (gotcred != 0) 514 gss_release_cred(&min_stat, &cred); 515 return (TRUE); 516 } 517 } 518 } 519 #endif 520 result->major_status = gss_init_sec_context(&result->minor_status, 521 cred, &ctx, name, argp->mech_type, 522 argp->req_flags, argp->time_req, argp->input_chan_bindings, 523 &argp->input_token, &result->actual_mech_type, 524 &result->output_token, &result->ret_flags, &result->time_rec); 525 gssd_verbose_out("gssd_init_sec_context: done major=0x%x minor=%d" 526 " uid=%d\n", (unsigned int)result->major_status, 527 (int)result->minor_status, (int)argp->uid); 528 if (gotcred != 0) 529 gss_release_cred(&min_stat, &cred); 530 531 if (result->major_status == GSS_S_COMPLETE 532 || result->major_status == GSS_S_CONTINUE_NEEDED) { 533 if (argp->ctx) 534 result->ctx = argp->ctx; 535 else 536 result->ctx = gssd_make_resource(ctx); 537 } 538 539 return (TRUE); 540 } 541 542 bool_t 543 gssd_accept_sec_context_1_svc(accept_sec_context_args *argp, accept_sec_context_res *result, struct svc_req *rqstp) 544 { 545 gss_ctx_id_t ctx = GSS_C_NO_CONTEXT; 546 gss_cred_id_t cred = GSS_C_NO_CREDENTIAL; 547 gss_name_t src_name; 548 gss_cred_id_t delegated_cred_handle; 549 550 memset(result, 0, sizeof(*result)); 551 if (argp->ctx) { 552 ctx = gssd_find_resource(argp->ctx); 553 if (!ctx) { 554 result->major_status = GSS_S_CONTEXT_EXPIRED; 555 gssd_verbose_out("gssd_accept_sec_context: ctx" 556 " resource not found\n"); 557 return (TRUE); 558 } 559 } 560 if (argp->cred) { 561 cred = gssd_find_resource(argp->cred); 562 if (!cred) { 563 result->major_status = GSS_S_CREDENTIALS_EXPIRED; 564 gssd_verbose_out("gssd_accept_sec_context: cred" 565 " resource not found\n"); 566 return (TRUE); 567 } 568 } 569 570 memset(result, 0, sizeof(*result)); 571 result->major_status = gss_accept_sec_context(&result->minor_status, 572 &ctx, cred, &argp->input_token, argp->input_chan_bindings, 573 &src_name, &result->mech_type, &result->output_token, 574 &result->ret_flags, &result->time_rec, 575 &delegated_cred_handle); 576 gssd_verbose_out("gssd_accept_sec_context: done major=0x%x minor=%d\n", 577 (unsigned int)result->major_status, (int)result->minor_status); 578 579 if (result->major_status == GSS_S_COMPLETE 580 || result->major_status == GSS_S_CONTINUE_NEEDED) { 581 if (argp->ctx) 582 result->ctx = argp->ctx; 583 else 584 result->ctx = gssd_make_resource(ctx); 585 result->src_name = gssd_make_resource(src_name); 586 result->delegated_cred_handle = 587 gssd_make_resource(delegated_cred_handle); 588 } 589 590 return (TRUE); 591 } 592 593 bool_t 594 gssd_delete_sec_context_1_svc(delete_sec_context_args *argp, delete_sec_context_res *result, struct svc_req *rqstp) 595 { 596 gss_ctx_id_t ctx = gssd_find_resource(argp->ctx); 597 598 if (ctx) { 599 result->major_status = gss_delete_sec_context( 600 &result->minor_status, &ctx, &result->output_token); 601 gssd_delete_resource(argp->ctx); 602 } else { 603 result->major_status = GSS_S_COMPLETE; 604 result->minor_status = 0; 605 } 606 gssd_verbose_out("gssd_delete_sec_context: done major=0x%x minor=%d\n", 607 (unsigned int)result->major_status, (int)result->minor_status); 608 609 return (TRUE); 610 } 611 612 bool_t 613 gssd_export_sec_context_1_svc(export_sec_context_args *argp, export_sec_context_res *result, struct svc_req *rqstp) 614 { 615 gss_ctx_id_t ctx = gssd_find_resource(argp->ctx); 616 617 if (ctx) { 618 result->major_status = gss_export_sec_context( 619 &result->minor_status, &ctx, 620 &result->interprocess_token); 621 result->format = KGSS_HEIMDAL_1_1; 622 gssd_delete_resource(argp->ctx); 623 } else { 624 result->major_status = GSS_S_FAILURE; 625 result->minor_status = 0; 626 result->interprocess_token.length = 0; 627 result->interprocess_token.value = NULL; 628 } 629 gssd_verbose_out("gssd_export_sec_context: done major=0x%x minor=%d\n", 630 (unsigned int)result->major_status, (int)result->minor_status); 631 632 return (TRUE); 633 } 634 635 bool_t 636 gssd_import_name_1_svc(import_name_args *argp, import_name_res *result, struct svc_req *rqstp) 637 { 638 gss_name_t name; 639 640 result->major_status = gss_import_name(&result->minor_status, 641 &argp->input_name_buffer, argp->input_name_type, &name); 642 gssd_verbose_out("gssd_import_name: done major=0x%x minor=%d\n", 643 (unsigned int)result->major_status, (int)result->minor_status); 644 645 if (result->major_status == GSS_S_COMPLETE) 646 result->output_name = gssd_make_resource(name); 647 else 648 result->output_name = 0; 649 650 return (TRUE); 651 } 652 653 bool_t 654 gssd_canonicalize_name_1_svc(canonicalize_name_args *argp, canonicalize_name_res *result, struct svc_req *rqstp) 655 { 656 gss_name_t name = gssd_find_resource(argp->input_name); 657 gss_name_t output_name; 658 659 memset(result, 0, sizeof(*result)); 660 if (!name) { 661 result->major_status = GSS_S_BAD_NAME; 662 return (TRUE); 663 } 664 665 result->major_status = gss_canonicalize_name(&result->minor_status, 666 name, argp->mech_type, &output_name); 667 gssd_verbose_out("gssd_canonicalize_name: done major=0x%x minor=%d\n", 668 (unsigned int)result->major_status, (int)result->minor_status); 669 670 if (result->major_status == GSS_S_COMPLETE) 671 result->output_name = gssd_make_resource(output_name); 672 else 673 result->output_name = 0; 674 675 return (TRUE); 676 } 677 678 bool_t 679 gssd_export_name_1_svc(export_name_args *argp, export_name_res *result, struct svc_req *rqstp) 680 { 681 gss_name_t name = gssd_find_resource(argp->input_name); 682 683 memset(result, 0, sizeof(*result)); 684 if (!name) { 685 result->major_status = GSS_S_BAD_NAME; 686 gssd_verbose_out("gssd_export_name: name resource not found\n"); 687 return (TRUE); 688 } 689 690 result->major_status = gss_export_name(&result->minor_status, 691 name, &result->exported_name); 692 gssd_verbose_out("gssd_export_name: done major=0x%x minor=%d\n", 693 (unsigned int)result->major_status, (int)result->minor_status); 694 695 return (TRUE); 696 } 697 698 bool_t 699 gssd_release_name_1_svc(release_name_args *argp, release_name_res *result, struct svc_req *rqstp) 700 { 701 gss_name_t name = gssd_find_resource(argp->input_name); 702 703 if (name) { 704 result->major_status = gss_release_name(&result->minor_status, 705 &name); 706 gssd_delete_resource(argp->input_name); 707 } else { 708 result->major_status = GSS_S_COMPLETE; 709 result->minor_status = 0; 710 } 711 gssd_verbose_out("gssd_release_name: done major=0x%x minor=%d\n", 712 (unsigned int)result->major_status, (int)result->minor_status); 713 714 return (TRUE); 715 } 716 717 bool_t 718 gssd_pname_to_uid_1_svc(pname_to_uid_args *argp, pname_to_uid_res *result, struct svc_req *rqstp) 719 { 720 gss_name_t name = gssd_find_resource(argp->pname); 721 uid_t uid; 722 char buf[1024], *bufp; 723 struct passwd pwd, *pw; 724 size_t buflen; 725 int error; 726 static size_t buflen_hint = 1024; 727 728 memset(result, 0, sizeof(*result)); 729 if (name) { 730 result->major_status = 731 gss_pname_to_uid(&result->minor_status, 732 name, argp->mech, &uid); 733 if (result->major_status == GSS_S_COMPLETE) { 734 result->uid = uid; 735 buflen = buflen_hint; 736 for (;;) { 737 pw = NULL; 738 bufp = buf; 739 if (buflen > sizeof(buf)) 740 bufp = malloc(buflen); 741 if (bufp == NULL) 742 break; 743 error = getpwuid_r(uid, &pwd, bufp, buflen, 744 &pw); 745 if (error != ERANGE) 746 break; 747 if (buflen > sizeof(buf)) 748 free(bufp); 749 buflen += 1024; 750 if (buflen > buflen_hint) 751 buflen_hint = buflen; 752 } 753 if (pw) { 754 int len = NGROUPS; 755 int groups[NGROUPS]; 756 result->gid = pw->pw_gid; 757 getgrouplist(pw->pw_name, pw->pw_gid, 758 groups, &len); 759 result->gidlist.gidlist_len = len; 760 result->gidlist.gidlist_val = 761 mem_alloc(len * sizeof(int)); 762 memcpy(result->gidlist.gidlist_val, groups, 763 len * sizeof(int)); 764 gssd_verbose_out("gssd_pname_to_uid: mapped" 765 " to uid=%d, gid=%d\n", (int)result->uid, 766 (int)result->gid); 767 } else { 768 result->gid = 65534; 769 result->gidlist.gidlist_len = 0; 770 result->gidlist.gidlist_val = NULL; 771 gssd_verbose_out("gssd_pname_to_uid: mapped" 772 " to uid=%d, but no groups\n", 773 (int)result->uid); 774 } 775 if (bufp != NULL && buflen > sizeof(buf)) 776 free(bufp); 777 } else 778 gssd_verbose_out("gssd_pname_to_uid: failed major=0x%x" 779 " minor=%d\n", (unsigned int)result->major_status, 780 (int)result->minor_status); 781 } else { 782 result->major_status = GSS_S_BAD_NAME; 783 result->minor_status = 0; 784 gssd_verbose_out("gssd_pname_to_uid: no name\n"); 785 } 786 787 return (TRUE); 788 } 789 790 bool_t 791 gssd_acquire_cred_1_svc(acquire_cred_args *argp, acquire_cred_res *result, struct svc_req *rqstp) 792 { 793 gss_name_t desired_name = GSS_C_NO_NAME; 794 gss_cred_id_t cred; 795 char ccname[PATH_MAX + 5 + 1], *cp, *cp2; 796 int gotone; 797 #ifndef WITHOUT_KERBEROS 798 gss_buffer_desc namebuf; 799 uint32_t minstat; 800 krb5_error_code kret; 801 #endif 802 803 memset(result, 0, sizeof(*result)); 804 if (argp->desired_name) { 805 desired_name = gssd_find_resource(argp->desired_name); 806 if (!desired_name) { 807 result->major_status = GSS_S_BAD_NAME; 808 gssd_verbose_out("gssd_acquire_cred: no desired name" 809 " found\n"); 810 return (TRUE); 811 } 812 } 813 814 #ifndef WITHOUT_KERBEROS 815 if (hostbased_initiator_cred != 0 && argp->desired_name != 0 && 816 argp->uid == 0 && argp->cred_usage == GSS_C_INITIATE) { 817 /* This is a host based initiator name in the keytab file. */ 818 snprintf(ccname, sizeof(ccname), "FILE:%s", 819 GSSD_CREDENTIAL_CACHE_FILE); 820 setenv("KRB5CCNAME", ccname, TRUE); 821 result->major_status = gss_display_name(&result->minor_status, 822 desired_name, &namebuf, NULL); 823 gssd_verbose_out("gssd_acquire_cred: desired name for host " 824 "based initiator cred major=0x%x minor=%d\n", 825 (unsigned int)result->major_status, 826 (int)result->minor_status); 827 if (result->major_status != GSS_S_COMPLETE) 828 return (TRUE); 829 if (namebuf.length > PATH_MAX + 5) { 830 result->minor_status = 0; 831 result->major_status = GSS_S_FAILURE; 832 return (TRUE); 833 } 834 memcpy(ccname, namebuf.value, namebuf.length); 835 ccname[namebuf.length] = '\0'; 836 if ((cp = strchr(ccname, '@')) != NULL) 837 *cp = '/'; 838 kret = gssd_get_cc_from_keytab(ccname); 839 gssd_verbose_out("gssd_acquire_cred: using keytab entry for " 840 "%s, kerberos ret=%d\n", ccname, (int)kret); 841 gss_release_buffer(&minstat, &namebuf); 842 if (kret != 0) { 843 result->minor_status = kret; 844 result->major_status = GSS_S_FAILURE; 845 return (TRUE); 846 } 847 } else 848 #endif /* !WITHOUT_KERBEROS */ 849 if (ccfile_dirlist[0] != '\0' && argp->desired_name == 0) { 850 /* 851 * For the "-s" case and no name provided as an 852 * argument, search the directory list for an appropriate 853 * credential cache file. If the search fails, return failure. 854 */ 855 gotone = 0; 856 cp = ccfile_dirlist; 857 do { 858 cp2 = strchr(cp, ':'); 859 if (cp2 != NULL) 860 *cp2 = '\0'; 861 gotone = find_ccache_file(cp, argp->uid, ccname); 862 if (gotone != 0) 863 break; 864 if (cp2 != NULL) 865 *cp2++ = ':'; 866 cp = cp2; 867 } while (cp != NULL && *cp != '\0'); 868 if (gotone == 0) { 869 result->major_status = GSS_S_CREDENTIALS_EXPIRED; 870 gssd_verbose_out("gssd_acquire_cred: no cred cache" 871 " file found\n"); 872 return (TRUE); 873 } 874 setenv("KRB5CCNAME", ccname, TRUE); 875 } else { 876 /* 877 * If there wasn't a "-s" option or the name has 878 * been provided as an argument, do it the old way. 879 * When a name is provided, it will normally exist in the 880 * default keytab file and the uid will be root. 881 */ 882 if (argp->desired_name != 0 && argp->uid != 0) { 883 if (debug_level == 0) 884 syslog(LOG_ERR, "gss_acquire_cred:" 885 " principal_name for non-root"); 886 else 887 fprintf(stderr, "gss_acquire_cred:" 888 " principal_name for non-root\n"); 889 } 890 snprintf(ccname, sizeof(ccname), "FILE:/tmp/krb5cc_%d", 891 (int) argp->uid); 892 setenv("KRB5CCNAME", ccname, TRUE); 893 } 894 895 result->major_status = gss_acquire_cred(&result->minor_status, 896 desired_name, argp->time_req, argp->desired_mechs, 897 argp->cred_usage, &cred, &result->actual_mechs, &result->time_rec); 898 gssd_verbose_out("gssd_acquire_cred: done major=0x%x minor=%d\n", 899 (unsigned int)result->major_status, (int)result->minor_status); 900 901 if (result->major_status == GSS_S_COMPLETE) 902 result->output_cred = gssd_make_resource(cred); 903 else 904 result->output_cred = 0; 905 906 return (TRUE); 907 } 908 909 bool_t 910 gssd_set_cred_option_1_svc(set_cred_option_args *argp, set_cred_option_res *result, struct svc_req *rqstp) 911 { 912 gss_cred_id_t cred = gssd_find_resource(argp->cred); 913 914 memset(result, 0, sizeof(*result)); 915 if (!cred) { 916 result->major_status = GSS_S_CREDENTIALS_EXPIRED; 917 gssd_verbose_out("gssd_set_cred: no credentials\n"); 918 return (TRUE); 919 } 920 921 result->major_status = gss_set_cred_option(&result->minor_status, 922 &cred, argp->option_name, &argp->option_value); 923 gssd_verbose_out("gssd_set_cred: done major=0x%x minor=%d\n", 924 (unsigned int)result->major_status, (int)result->minor_status); 925 926 return (TRUE); 927 } 928 929 bool_t 930 gssd_release_cred_1_svc(release_cred_args *argp, release_cred_res *result, struct svc_req *rqstp) 931 { 932 gss_cred_id_t cred = gssd_find_resource(argp->cred); 933 934 if (cred) { 935 result->major_status = gss_release_cred(&result->minor_status, 936 &cred); 937 gssd_delete_resource(argp->cred); 938 } else { 939 result->major_status = GSS_S_COMPLETE; 940 result->minor_status = 0; 941 } 942 gssd_verbose_out("gssd_release_cred: done major=0x%x minor=%d\n", 943 (unsigned int)result->major_status, (int)result->minor_status); 944 945 return (TRUE); 946 } 947 948 bool_t 949 gssd_display_status_1_svc(display_status_args *argp, display_status_res *result, struct svc_req *rqstp) 950 { 951 952 result->message_context = argp->message_context; 953 result->major_status = gss_display_status(&result->minor_status, 954 argp->status_value, argp->status_type, argp->mech_type, 955 &result->message_context, &result->status_string); 956 gssd_verbose_out("gssd_display_status: done major=0x%x minor=%d\n", 957 (unsigned int)result->major_status, (int)result->minor_status); 958 959 return (TRUE); 960 } 961 962 int 963 gssd_1_freeresult(SVCXPRT *transp, xdrproc_t xdr_result, caddr_t result) 964 { 965 /* 966 * We don't use XDR to free the results - anything which was 967 * allocated came from GSS-API. We use xdr_result to figure 968 * out what to do. 969 */ 970 OM_uint32 junk; 971 972 if (xdr_result == (xdrproc_t) xdr_init_sec_context_res) { 973 init_sec_context_res *p = (init_sec_context_res *) result; 974 gss_release_buffer(&junk, &p->output_token); 975 } else if (xdr_result == (xdrproc_t) xdr_accept_sec_context_res) { 976 accept_sec_context_res *p = (accept_sec_context_res *) result; 977 gss_release_buffer(&junk, &p->output_token); 978 } else if (xdr_result == (xdrproc_t) xdr_delete_sec_context_res) { 979 delete_sec_context_res *p = (delete_sec_context_res *) result; 980 gss_release_buffer(&junk, &p->output_token); 981 } else if (xdr_result == (xdrproc_t) xdr_export_sec_context_res) { 982 export_sec_context_res *p = (export_sec_context_res *) result; 983 if (p->interprocess_token.length) 984 memset(p->interprocess_token.value, 0, 985 p->interprocess_token.length); 986 gss_release_buffer(&junk, &p->interprocess_token); 987 } else if (xdr_result == (xdrproc_t) xdr_export_name_res) { 988 export_name_res *p = (export_name_res *) result; 989 gss_release_buffer(&junk, &p->exported_name); 990 } else if (xdr_result == (xdrproc_t) xdr_acquire_cred_res) { 991 acquire_cred_res *p = (acquire_cred_res *) result; 992 gss_release_oid_set(&junk, &p->actual_mechs); 993 } else if (xdr_result == (xdrproc_t) xdr_pname_to_uid_res) { 994 pname_to_uid_res *p = (pname_to_uid_res *) result; 995 if (p->gidlist.gidlist_val) 996 free(p->gidlist.gidlist_val); 997 } else if (xdr_result == (xdrproc_t) xdr_display_status_res) { 998 display_status_res *p = (display_status_res *) result; 999 gss_release_buffer(&junk, &p->status_string); 1000 } 1001 1002 return (TRUE); 1003 } 1004 1005 /* 1006 * Search a directory for the most likely candidate to be used as the 1007 * credential cache for a uid. If successful, return 1 and fill the 1008 * file's path id into "rpath". Otherwise, return 0. 1009 */ 1010 static int 1011 find_ccache_file(const char *dirpath, uid_t uid, char *rpath) 1012 { 1013 DIR *dirp; 1014 struct dirent *dp; 1015 struct stat sb; 1016 time_t exptime, oexptime; 1017 int gotone, len, rating, orating; 1018 char namepath[PATH_MAX + 5 + 1]; 1019 char retpath[PATH_MAX + 5 + 1]; 1020 1021 dirp = opendir(dirpath); 1022 if (dirp == NULL) 1023 return (0); 1024 gotone = 0; 1025 orating = 0; 1026 oexptime = 0; 1027 while ((dp = readdir(dirp)) != NULL) { 1028 len = snprintf(namepath, sizeof(namepath), "%s/%s", dirpath, 1029 dp->d_name); 1030 if (len < sizeof(namepath) && 1031 (hostbased_initiator_cred == 0 || strcmp(namepath, 1032 GSSD_CREDENTIAL_CACHE_FILE) != 0) && 1033 strstr(dp->d_name, ccfile_substring) != NULL && 1034 lstat(namepath, &sb) >= 0 && 1035 sb.st_uid == uid && 1036 S_ISREG(sb.st_mode)) { 1037 len = snprintf(namepath, sizeof(namepath), "FILE:%s/%s", 1038 dirpath, dp->d_name); 1039 if (len < sizeof(namepath) && 1040 is_a_valid_tgt_cache(namepath, uid, &rating, 1041 &exptime) != 0) { 1042 if (gotone == 0 || rating > orating || 1043 (rating == orating && exptime > oexptime)) { 1044 orating = rating; 1045 oexptime = exptime; 1046 strcpy(retpath, namepath); 1047 gotone = 1; 1048 } 1049 } 1050 } 1051 } 1052 closedir(dirp); 1053 if (gotone != 0) { 1054 strcpy(rpath, retpath); 1055 return (1); 1056 } 1057 return (0); 1058 } 1059 1060 /* 1061 * Try to determine if the file is a valid tgt cache file. 1062 * Check that the file has a valid tgt for a principal. 1063 * If it does, return 1, otherwise return 0. 1064 * It also returns a "rating" and the expiry time for the TGT, when found. 1065 * This "rating" is higher based on heuristics that make it more 1066 * likely to be the correct credential cache file to use. It can 1067 * be used by the caller, along with expiry time, to select from 1068 * multiple credential cache files. 1069 */ 1070 static int 1071 is_a_valid_tgt_cache(const char *filepath, uid_t uid, int *retrating, 1072 time_t *retexptime) 1073 { 1074 #ifndef WITHOUT_KERBEROS 1075 krb5_context context; 1076 krb5_principal princ; 1077 krb5_ccache ccache; 1078 krb5_error_code retval; 1079 krb5_cc_cursor curse; 1080 krb5_creds krbcred; 1081 int gotone, orating, rating, ret; 1082 struct passwd *pw; 1083 char *cp, *cp2, *pname; 1084 time_t exptime; 1085 1086 /* Find a likely name for the uid principal. */ 1087 pw = getpwuid(uid); 1088 1089 /* 1090 * Do a bunch of krb5 library stuff to try and determine if 1091 * this file is a credentials cache with an appropriate TGT 1092 * in it. 1093 */ 1094 retval = krb5_init_context(&context); 1095 if (retval != 0) 1096 return (0); 1097 retval = krb5_cc_resolve(context, filepath, &ccache); 1098 if (retval != 0) { 1099 krb5_free_context(context); 1100 return (0); 1101 } 1102 ret = 0; 1103 orating = 0; 1104 exptime = 0; 1105 retval = krb5_cc_start_seq_get(context, ccache, &curse); 1106 if (retval == 0) { 1107 while ((retval = krb5_cc_next_cred(context, ccache, &curse, 1108 &krbcred)) == 0) { 1109 gotone = 0; 1110 rating = 0; 1111 retval = krb5_unparse_name(context, krbcred.server, 1112 &pname); 1113 if (retval == 0) { 1114 cp = strchr(pname, '/'); 1115 if (cp != NULL) { 1116 *cp++ = '\0'; 1117 if (strcmp(pname, "krbtgt") == 0 && 1118 krbcred.times.endtime > time(NULL) 1119 ) { 1120 gotone = 1; 1121 /* 1122 * Test to see if this is a 1123 * tgt for cross-realm auth. 1124 * Rate it higher, if it is not. 1125 */ 1126 cp2 = strchr(cp, '@'); 1127 if (cp2 != NULL) { 1128 *cp2++ = '\0'; 1129 if (strcmp(cp, cp2) == 1130 0) 1131 rating++; 1132 } 1133 } 1134 } 1135 free(pname); 1136 } 1137 if (gotone != 0) { 1138 retval = krb5_unparse_name(context, 1139 krbcred.client, &pname); 1140 if (retval == 0) { 1141 cp = strchr(pname, '@'); 1142 if (cp != NULL) { 1143 *cp++ = '\0'; 1144 if (pw != NULL && strcmp(pname, 1145 pw->pw_name) == 0) 1146 rating++; 1147 if (strchr(pname, '/') == NULL) 1148 rating++; 1149 if (pref_realm[0] != '\0' && 1150 strcmp(cp, pref_realm) == 0) 1151 rating++; 1152 } 1153 } 1154 free(pname); 1155 if (rating > orating) { 1156 orating = rating; 1157 exptime = krbcred.times.endtime; 1158 } else if (rating == orating && 1159 krbcred.times.endtime > exptime) 1160 exptime = krbcred.times.endtime; 1161 ret = 1; 1162 } 1163 krb5_free_cred_contents(context, &krbcred); 1164 } 1165 krb5_cc_end_seq_get(context, ccache, &curse); 1166 } 1167 krb5_cc_close(context, ccache); 1168 krb5_free_context(context); 1169 if (ret != 0) { 1170 *retrating = orating; 1171 *retexptime = exptime; 1172 } 1173 return (ret); 1174 #else /* WITHOUT_KERBEROS */ 1175 return (0); 1176 #endif /* !WITHOUT_KERBEROS */ 1177 } 1178 1179 #ifndef WITHOUT_KERBEROS 1180 /* 1181 * This function attempts to do essentially a "kinit -k" for the principal 1182 * name provided as the argument, so that there will be a TGT in the 1183 * credential cache. 1184 */ 1185 static krb5_error_code 1186 gssd_get_cc_from_keytab(const char *name) 1187 { 1188 krb5_error_code ret, opt_ret, princ_ret, cc_ret, kt_ret, cred_ret; 1189 krb5_context context; 1190 krb5_principal principal; 1191 krb5_keytab kt; 1192 krb5_creds cred; 1193 krb5_get_init_creds_opt *opt; 1194 krb5_deltat start_time = 0; 1195 krb5_ccache ccache; 1196 1197 ret = krb5_init_context(&context); 1198 if (ret != 0) 1199 return (ret); 1200 opt_ret = cc_ret = kt_ret = cred_ret = 1; /* anything non-zero */ 1201 princ_ret = ret = krb5_parse_name(context, name, &principal); 1202 if (ret == 0) 1203 opt_ret = ret = krb5_get_init_creds_opt_alloc(context, &opt); 1204 if (ret == 0) 1205 cc_ret = ret = krb5_cc_default(context, &ccache); 1206 if (ret == 0) 1207 ret = krb5_cc_initialize(context, ccache, principal); 1208 if (ret == 0) { 1209 krb5_get_init_creds_opt_set_default_flags(context, "gssd", 1210 krb5_principal_get_realm(context, principal), opt); 1211 kt_ret = ret = krb5_kt_default(context, &kt); 1212 } 1213 if (ret == 0) 1214 cred_ret = ret = krb5_get_init_creds_keytab(context, &cred, 1215 principal, kt, start_time, NULL, opt); 1216 if (ret == 0) 1217 ret = krb5_cc_store_cred(context, ccache, &cred); 1218 if (kt_ret == 0) 1219 krb5_kt_close(context, kt); 1220 if (cc_ret == 0) 1221 krb5_cc_close(context, ccache); 1222 if (opt_ret == 0) 1223 krb5_get_init_creds_opt_free(context, opt); 1224 if (princ_ret == 0) 1225 krb5_free_principal(context, principal); 1226 if (cred_ret == 0) 1227 krb5_free_cred_contents(context, &cred); 1228 krb5_free_context(context); 1229 return (ret); 1230 } 1231 1232 /* 1233 * Acquire a gss credential for a uid. 1234 */ 1235 static OM_uint32 1236 gssd_get_user_cred(OM_uint32 *min_statp, uid_t uid, gss_cred_id_t *credp) 1237 { 1238 gss_buffer_desc principal_desc; 1239 gss_name_t name; 1240 OM_uint32 maj_stat, min_stat; 1241 gss_OID_set mechlist; 1242 struct passwd *pw; 1243 1244 pw = getpwuid(uid); 1245 if (pw == NULL) { 1246 *min_statp = 0; 1247 return (GSS_S_FAILURE); 1248 } 1249 1250 /* 1251 * The mechanism must be set to KerberosV for acquisition 1252 * of credentials to work reliably. 1253 */ 1254 maj_stat = gss_create_empty_oid_set(min_statp, &mechlist); 1255 if (maj_stat != GSS_S_COMPLETE) 1256 return (maj_stat); 1257 maj_stat = gss_add_oid_set_member(min_statp, GSS_KRB5_MECH_OID_X, 1258 &mechlist); 1259 if (maj_stat != GSS_S_COMPLETE) { 1260 gss_release_oid_set(&min_stat, &mechlist); 1261 return (maj_stat); 1262 } 1263 1264 principal_desc.value = (void *)pw->pw_name; 1265 principal_desc.length = strlen(pw->pw_name); 1266 maj_stat = gss_import_name(min_statp, &principal_desc, 1267 GSS_C_NT_USER_NAME, &name); 1268 if (maj_stat != GSS_S_COMPLETE) { 1269 gss_release_oid_set(&min_stat, &mechlist); 1270 return (maj_stat); 1271 } 1272 /* Acquire the credentials. */ 1273 maj_stat = gss_acquire_cred(min_statp, name, 0, mechlist, 1274 GSS_C_INITIATE, credp, NULL, NULL); 1275 gss_release_name(&min_stat, &name); 1276 gss_release_oid_set(&min_stat, &mechlist); 1277 return (maj_stat); 1278 } 1279 #endif /* !WITHOUT_KERBEROS */ 1280 1281 void gssd_terminate(int sig __unused) 1282 { 1283 1284 #ifndef WITHOUT_KERBEROS 1285 if (hostbased_initiator_cred != 0) 1286 unlink(GSSD_CREDENTIAL_CACHE_FILE); 1287 #endif 1288 exit(0); 1289 } 1290 1291