1 /* $NetBSD: auth2-pubkey.c,v 1.8 2013/03/29 16:19:44 christos Exp $ */ 2 /* $OpenBSD: auth2-pubkey.c,v 1.34 2013/02/14 21:35:59 djm Exp $ */ 3 /* 4 * Copyright (c) 2000 Markus Friedl. All rights reserved. 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 ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include "includes.h" 28 __RCSID("$NetBSD: auth2-pubkey.c,v 1.8 2013/03/29 16:19:44 christos Exp $"); 29 #include <sys/types.h> 30 #include <sys/stat.h> 31 #include <sys/wait.h> 32 33 #include <errno.h> 34 #include <fcntl.h> 35 #include <paths.h> 36 #include <pwd.h> 37 #include <signal.h> 38 #include <stdio.h> 39 #include <stdarg.h> 40 #include <string.h> 41 #include <time.h> 42 #include <unistd.h> 43 44 #include "xmalloc.h" 45 #include "ssh.h" 46 #include "ssh2.h" 47 #include "packet.h" 48 #include "buffer.h" 49 #include "log.h" 50 #include "servconf.h" 51 #include "compat.h" 52 #include "key.h" 53 #include "hostfile.h" 54 #include "auth.h" 55 #include "pathnames.h" 56 #include "uidswap.h" 57 #include "auth-options.h" 58 #include "canohost.h" 59 #ifdef GSSAPI 60 #include "ssh-gss.h" 61 #endif 62 #include "monitor_wrap.h" 63 #include "misc.h" 64 #include "authfile.h" 65 #include "match.h" 66 67 #ifdef WITH_LDAP_PUBKEY 68 #include "ldapauth.h" 69 #endif 70 71 /* import */ 72 extern ServerOptions options; 73 extern u_char *session_id2; 74 extern u_int session_id2_len; 75 76 static int 77 userauth_pubkey(Authctxt *authctxt) 78 { 79 Buffer b; 80 Key *key = NULL; 81 char *pkalg; 82 u_char *pkblob, *sig; 83 u_int alen, blen, slen; 84 int have_sig, pktype; 85 int authenticated = 0; 86 87 if (!authctxt->valid) { 88 debug2("userauth_pubkey: disabled because of invalid user"); 89 return 0; 90 } 91 have_sig = packet_get_char(); 92 if (datafellows & SSH_BUG_PKAUTH) { 93 debug2("userauth_pubkey: SSH_BUG_PKAUTH"); 94 /* no explicit pkalg given */ 95 pkblob = packet_get_string(&blen); 96 buffer_init(&b); 97 buffer_append(&b, pkblob, blen); 98 /* so we have to extract the pkalg from the pkblob */ 99 pkalg = buffer_get_string(&b, &alen); 100 buffer_free(&b); 101 } else { 102 pkalg = packet_get_string(&alen); 103 pkblob = packet_get_string(&blen); 104 } 105 pktype = key_type_from_name(pkalg); 106 if (pktype == KEY_UNSPEC) { 107 /* this is perfectly legal */ 108 logit("userauth_pubkey: unsupported public key algorithm: %s", 109 pkalg); 110 goto done; 111 } 112 key = key_from_blob(pkblob, blen); 113 if (key == NULL) { 114 error("userauth_pubkey: cannot decode key: %s", pkalg); 115 goto done; 116 } 117 if (key->type != pktype) { 118 error("userauth_pubkey: type mismatch for decoded key " 119 "(received %d, expected %d)", key->type, pktype); 120 goto done; 121 } 122 if (have_sig) { 123 sig = packet_get_string(&slen); 124 packet_check_eom(); 125 buffer_init(&b); 126 if (datafellows & SSH_OLD_SESSIONID) { 127 buffer_append(&b, session_id2, session_id2_len); 128 } else { 129 buffer_put_string(&b, session_id2, session_id2_len); 130 } 131 /* reconstruct packet */ 132 buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); 133 buffer_put_cstring(&b, authctxt->user); 134 buffer_put_cstring(&b, 135 datafellows & SSH_BUG_PKSERVICE ? 136 "ssh-userauth" : 137 authctxt->service); 138 if (datafellows & SSH_BUG_PKAUTH) { 139 buffer_put_char(&b, have_sig); 140 } else { 141 buffer_put_cstring(&b, "publickey"); 142 buffer_put_char(&b, have_sig); 143 buffer_put_cstring(&b, pkalg); 144 } 145 buffer_put_string(&b, pkblob, blen); 146 #ifdef DEBUG_PK 147 buffer_dump(&b); 148 #endif 149 /* test for correct signature */ 150 authenticated = 0; 151 if (PRIVSEP(user_key_allowed(authctxt->pw, key)) && 152 PRIVSEP(key_verify(key, sig, slen, buffer_ptr(&b), 153 buffer_len(&b))) == 1) 154 authenticated = 1; 155 buffer_free(&b); 156 xfree(sig); 157 } else { 158 debug("test whether pkalg/pkblob are acceptable"); 159 packet_check_eom(); 160 161 /* XXX fake reply and always send PK_OK ? */ 162 /* 163 * XXX this allows testing whether a user is allowed 164 * to login: if you happen to have a valid pubkey this 165 * message is sent. the message is NEVER sent at all 166 * if a user is not allowed to login. is this an 167 * issue? -markus 168 */ 169 if (PRIVSEP(user_key_allowed(authctxt->pw, key))) { 170 packet_start(SSH2_MSG_USERAUTH_PK_OK); 171 packet_put_string(pkalg, alen); 172 packet_put_string(pkblob, blen); 173 packet_send(); 174 packet_write_wait(); 175 authctxt->postponed = 1; 176 } 177 } 178 if (authenticated != 1) 179 auth_clear_options(); 180 done: 181 debug2("userauth_pubkey: authenticated %d pkalg %s", authenticated, pkalg); 182 if (key != NULL) 183 key_free(key); 184 xfree(pkalg); 185 xfree(pkblob); 186 return authenticated; 187 } 188 189 static int 190 match_principals_option(const char *principal_list, struct KeyCert *cert) 191 { 192 char *result; 193 u_int i; 194 195 /* XXX percent_expand() sequences for authorized_principals? */ 196 197 for (i = 0; i < cert->nprincipals; i++) { 198 if ((result = match_list(cert->principals[i], 199 principal_list, NULL)) != NULL) { 200 debug3("matched principal from key options \"%.100s\"", 201 result); 202 xfree(result); 203 return 1; 204 } 205 } 206 return 0; 207 } 208 209 static int 210 match_principals_file(char *file, struct passwd *pw, struct KeyCert *cert) 211 { 212 FILE *f; 213 char line[SSH_MAX_PUBKEY_BYTES], *cp, *ep, *line_opts; 214 u_long linenum = 0; 215 u_int i; 216 217 temporarily_use_uid(pw); 218 debug("trying authorized principals file %s", file); 219 if ((f = auth_openprincipals(file, pw, options.strict_modes)) == NULL) { 220 restore_uid(); 221 return 0; 222 } 223 while (read_keyfile_line(f, file, line, sizeof(line), &linenum) != -1) { 224 /* Skip leading whitespace. */ 225 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 226 ; 227 /* Skip blank and comment lines. */ 228 if ((ep = strchr(cp, '#')) != NULL) 229 *ep = '\0'; 230 if (!*cp || *cp == '\n') 231 continue; 232 /* Trim trailing whitespace. */ 233 ep = cp + strlen(cp) - 1; 234 while (ep > cp && (*ep == '\n' || *ep == ' ' || *ep == '\t')) 235 *ep-- = '\0'; 236 /* 237 * If the line has internal whitespace then assume it has 238 * key options. 239 */ 240 line_opts = NULL; 241 if ((ep = strrchr(cp, ' ')) != NULL || 242 (ep = strrchr(cp, '\t')) != NULL) { 243 for (; *ep == ' ' || *ep == '\t'; ep++) 244 ; 245 line_opts = cp; 246 cp = ep; 247 } 248 for (i = 0; i < cert->nprincipals; i++) { 249 if (strcmp(cp, cert->principals[i]) == 0) { 250 debug3("matched principal \"%.100s\" " 251 "from file \"%s\" on line %lu", 252 cert->principals[i], file, linenum); 253 if (auth_parse_options(pw, line_opts, 254 file, linenum) != 1) 255 continue; 256 fclose(f); 257 restore_uid(); 258 return 1; 259 } 260 } 261 } 262 fclose(f); 263 restore_uid(); 264 return 0; 265 } 266 267 /* 268 * Checks whether key is allowed in authorized_keys-format file, 269 * returns 1 if the key is allowed or 0 otherwise. 270 */ 271 static int 272 check_authkeys_file(FILE *f, char *file, Key* key, struct passwd *pw) 273 { 274 char line[SSH_MAX_PUBKEY_BYTES]; 275 const char *reason; 276 int found_key = 0; 277 u_long linenum = 0; 278 Key *found; 279 char *fp; 280 #ifdef WITH_LDAP_PUBKEY 281 ldap_key_t * k; 282 unsigned int i = 0; 283 #endif 284 285 #ifdef WITH_LDAP_PUBKEY 286 found_key = 0; 287 /* allocate a new key type */ 288 found = key_new(key->type); 289 290 /* first check if the options is enabled, then try.. */ 291 if (options.lpk.on) { 292 debug("[LDAP] trying LDAP first uid=%s",pw->pw_name); 293 if (ldap_ismember(&options.lpk, pw->pw_name) > 0) { 294 if ((k = ldap_getuserkey(&options.lpk, pw->pw_name)) != NULL) { 295 /* Skip leading whitespace, empty and comment lines. */ 296 for (i = 0 ; i < k->num ; i++) { 297 /* dont forget if multiple keys to reset options */ 298 char *cp, *xoptions = NULL; 299 300 for (cp = (char *)k->keys[i]->bv_val; *cp == ' ' || *cp == '\t'; cp++) 301 ; 302 if (!*cp || *cp == '\n' || *cp == '#') 303 continue; 304 305 if (key_read(found, &cp) != 1) { 306 /* no key? check if there are options for this key */ 307 int quoted = 0; 308 debug2("[LDAP] user_key_allowed: check options: '%s'", cp); 309 xoptions = cp; 310 for (; *cp && (quoted || (*cp != ' ' && *cp != '\t')); cp++) { 311 if (*cp == '\\' && cp[1] == '"') 312 cp++; /* Skip both */ 313 else if (*cp == '"') 314 quoted = !quoted; 315 } 316 /* Skip remaining whitespace. */ 317 for (; *cp == ' ' || *cp == '\t'; cp++) 318 ; 319 if (key_read(found, &cp) != 1) { 320 debug2("[LDAP] user_key_allowed: advance: '%s'", cp); 321 /* still no key? advance to next line*/ 322 continue; 323 } 324 } 325 326 if (key_equal(found, key) && 327 auth_parse_options(pw, xoptions, file, linenum) == 1) { 328 found_key = 1; 329 debug("[LDAP] matching key found"); 330 fp = key_fingerprint(found, SSH_FP_MD5, SSH_FP_HEX); 331 verbose("[LDAP] Found matching %s key: %s", key_type(found), fp); 332 333 /* restoring memory */ 334 ldap_keys_free(k); 335 xfree(fp); 336 restore_uid(); 337 key_free(found); 338 return found_key; 339 break; 340 } 341 }/* end of LDAP for() */ 342 } else { 343 logit("[LDAP] no keys found for '%s'!", pw->pw_name); 344 } 345 } else { 346 logit("[LDAP] '%s' is not in '%s'", pw->pw_name, options.lpk.sgroup); 347 } 348 } 349 #endif 350 debug("trying public key file %s", file); 351 f = auth_openkeyfile(file, pw, options.strict_modes); 352 353 if (!f) { 354 restore_uid(); 355 return 0; 356 } 357 358 found_key = 0; 359 found = key_new(key_is_cert(key) ? KEY_UNSPEC : key->type); 360 361 while (read_keyfile_line(f, file, line, sizeof(line), &linenum) != -1) { 362 char *cp, *key_options = NULL; 363 364 auth_clear_options(); 365 366 /* Skip leading whitespace, empty and comment lines. */ 367 for (cp = line; *cp == ' ' || *cp == '\t'; cp++) 368 ; 369 if (!*cp || *cp == '\n' || *cp == '#') 370 continue; 371 372 if (key_read(found, &cp) != 1) { 373 /* no key? check if there are options for this key */ 374 int quoted = 0; 375 debug2("user_key_allowed: check options: '%s'", cp); 376 key_options = cp; 377 for (; *cp && (quoted || (*cp != ' ' && *cp != '\t')); cp++) { 378 if (*cp == '\\' && cp[1] == '"') 379 cp++; /* Skip both */ 380 else if (*cp == '"') 381 quoted = !quoted; 382 } 383 /* Skip remaining whitespace. */ 384 for (; *cp == ' ' || *cp == '\t'; cp++) 385 ; 386 if (key_read(found, &cp) != 1) { 387 debug2("user_key_allowed: advance: '%s'", cp); 388 /* still no key? advance to next line*/ 389 continue; 390 } 391 } 392 if (key_is_cert(key)) { 393 if (!key_equal(found, key->cert->signature_key)) 394 continue; 395 if (auth_parse_options(pw, key_options, file, 396 linenum) != 1) 397 continue; 398 if (!key_is_cert_authority) 399 continue; 400 fp = key_fingerprint(found, SSH_FP_MD5, 401 SSH_FP_HEX); 402 debug("matching CA found: file %s, line %lu, %s %s", 403 file, linenum, key_type(found), fp); 404 /* 405 * If the user has specified a list of principals as 406 * a key option, then prefer that list to matching 407 * their username in the certificate principals list. 408 */ 409 if (authorized_principals != NULL && 410 !match_principals_option(authorized_principals, 411 key->cert)) { 412 reason = "Certificate does not contain an " 413 "authorized principal"; 414 fail_reason: 415 xfree(fp); 416 error("%s", reason); 417 auth_debug_add("%s", reason); 418 continue; 419 } 420 if (key_cert_check_authority(key, 0, 0, 421 authorized_principals == NULL ? pw->pw_name : NULL, 422 &reason) != 0) 423 goto fail_reason; 424 if (auth_cert_options(key, pw) != 0) { 425 xfree(fp); 426 continue; 427 } 428 verbose("Accepted certificate ID \"%s\" " 429 "signed by %s CA %s via %s", key->cert->key_id, 430 key_type(found), fp, file); 431 xfree(fp); 432 found_key = 1; 433 break; 434 } else if (key_equal(found, key)) { 435 if (auth_parse_options(pw, key_options, file, 436 linenum) != 1) 437 continue; 438 if (key_is_cert_authority) 439 continue; 440 found_key = 1; 441 debug("matching key found: file %s, line %lu", 442 file, linenum); 443 fp = key_fingerprint(found, SSH_FP_MD5, SSH_FP_HEX); 444 verbose("Found matching %s key: %s", 445 key_type(found), fp); 446 xfree(fp); 447 break; 448 } 449 } 450 key_free(found); 451 if (!found_key) 452 debug2("key not found"); 453 return found_key; 454 } 455 456 /* Authenticate a certificate key against TrustedUserCAKeys */ 457 static int 458 user_cert_trusted_ca(struct passwd *pw, Key *key) 459 { 460 char *ca_fp, *principals_file = NULL; 461 const char *reason; 462 int ret = 0; 463 464 if (!key_is_cert(key) || options.trusted_user_ca_keys == NULL) 465 return 0; 466 467 ca_fp = key_fingerprint(key->cert->signature_key, 468 SSH_FP_MD5, SSH_FP_HEX); 469 470 if (key_in_file(key->cert->signature_key, 471 options.trusted_user_ca_keys, 1) != 1) { 472 debug2("%s: CA %s %s is not listed in %s", __func__, 473 key_type(key->cert->signature_key), ca_fp, 474 options.trusted_user_ca_keys); 475 goto out; 476 } 477 /* 478 * If AuthorizedPrincipals is in use, then compare the certificate 479 * principals against the names in that file rather than matching 480 * against the username. 481 */ 482 if ((principals_file = authorized_principals_file(pw)) != NULL) { 483 if (!match_principals_file(principals_file, pw, key->cert)) { 484 reason = "Certificate does not contain an " 485 "authorized principal"; 486 fail_reason: 487 error("%s", reason); 488 auth_debug_add("%s", reason); 489 goto out; 490 } 491 } 492 if (key_cert_check_authority(key, 0, 1, 493 principals_file == NULL ? pw->pw_name : NULL, &reason) != 0) 494 goto fail_reason; 495 if (auth_cert_options(key, pw) != 0) 496 goto out; 497 498 verbose("Accepted certificate ID \"%s\" signed by %s CA %s via %s", 499 key->cert->key_id, key_type(key->cert->signature_key), ca_fp, 500 options.trusted_user_ca_keys); 501 ret = 1; 502 503 out: 504 if (principals_file != NULL) 505 xfree(principals_file); 506 if (ca_fp != NULL) 507 xfree(ca_fp); 508 return ret; 509 } 510 511 /* 512 * Checks whether key is allowed in file. 513 * returns 1 if the key is allowed or 0 otherwise. 514 */ 515 static int 516 user_key_allowed2(struct passwd *pw, Key *key, char *file) 517 { 518 FILE *f; 519 int found_key = 0; 520 521 /* Temporarily use the user's uid. */ 522 temporarily_use_uid(pw); 523 524 debug("trying public key file %s", file); 525 if ((f = auth_openkeyfile(file, pw, options.strict_modes)) != NULL) { 526 found_key = check_authkeys_file(f, file, key, pw); 527 fclose(f); 528 } 529 530 restore_uid(); 531 return found_key; 532 } 533 534 /* 535 * Checks whether key is allowed in output of command. 536 * returns 1 if the key is allowed or 0 otherwise. 537 */ 538 static int 539 user_key_command_allowed2(struct passwd *user_pw, Key *key) 540 { 541 FILE *f; 542 int ok, found_key = 0; 543 struct passwd *pw; 544 struct stat st; 545 int status, devnull, p[2], i; 546 pid_t pid; 547 char *username, errmsg[512]; 548 549 if (options.authorized_keys_command == NULL || 550 options.authorized_keys_command[0] != '/') 551 return 0; 552 553 if (options.authorized_keys_command_user == NULL) { 554 error("No user for AuthorizedKeysCommand specified, skipping"); 555 return 0; 556 } 557 558 username = percent_expand(options.authorized_keys_command_user, 559 "u", user_pw->pw_name, (char *)NULL); 560 pw = getpwnam(username); 561 if (pw == NULL) { 562 error("AuthorizedKeysCommandUser \"%s\" not found: %s", 563 username, strerror(errno)); 564 free(username); 565 return 0; 566 } 567 free(username); 568 569 temporarily_use_uid(pw); 570 571 if (stat(options.authorized_keys_command, &st) < 0) { 572 error("Could not stat AuthorizedKeysCommand \"%s\": %s", 573 options.authorized_keys_command, strerror(errno)); 574 goto out; 575 } 576 if (auth_secure_path(options.authorized_keys_command, &st, NULL, 0, 577 errmsg, sizeof(errmsg)) != 0) { 578 error("Unsafe AuthorizedKeysCommand: %s", errmsg); 579 goto out; 580 } 581 582 if (pipe(p) != 0) { 583 error("%s: pipe: %s", __func__, strerror(errno)); 584 goto out; 585 } 586 587 debug3("Running AuthorizedKeysCommand: \"%s %s\" as \"%s\"", 588 options.authorized_keys_command, user_pw->pw_name, pw->pw_name); 589 590 /* 591 * Don't want to call this in the child, where it can fatal() and 592 * run cleanup_exit() code. 593 */ 594 restore_uid(); 595 596 switch ((pid = fork())) { 597 case -1: /* error */ 598 error("%s: fork: %s", __func__, strerror(errno)); 599 close(p[0]); 600 close(p[1]); 601 return 0; 602 case 0: /* child */ 603 for (i = 0; i < NSIG; i++) 604 signal(i, SIG_DFL); 605 606 if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) { 607 error("%s: open %s: %s", __func__, _PATH_DEVNULL, 608 strerror(errno)); 609 _exit(1); 610 } 611 /* Keep stderr around a while longer to catch errors */ 612 if (dup2(devnull, STDIN_FILENO) == -1 || 613 dup2(p[1], STDOUT_FILENO) == -1) { 614 error("%s: dup2: %s", __func__, strerror(errno)); 615 _exit(1); 616 } 617 closefrom(STDERR_FILENO + 1); 618 619 /* Don't use permanently_set_uid() here to avoid fatal() */ 620 if (setgid(pw->pw_gid) != 0) { 621 error("setgid %u: %s", (u_int)pw->pw_gid, 622 strerror(errno)); 623 _exit(1); 624 } 625 if (setuid(pw->pw_uid) != 0) { 626 error("setuid %u: %s", (u_int)pw->pw_uid, 627 strerror(errno)); 628 _exit(1); 629 } 630 /* stdin is pointed to /dev/null at this point */ 631 if (dup2(STDIN_FILENO, STDERR_FILENO) == -1) { 632 error("%s: dup2: %s", __func__, strerror(errno)); 633 _exit(1); 634 } 635 636 execl(options.authorized_keys_command, 637 options.authorized_keys_command, user_pw->pw_name, NULL); 638 639 error("AuthorizedKeysCommand %s exec failed: %s", 640 options.authorized_keys_command, strerror(errno)); 641 _exit(127); 642 default: /* parent */ 643 break; 644 } 645 646 temporarily_use_uid(pw); 647 648 close(p[1]); 649 if ((f = fdopen(p[0], "r")) == NULL) { 650 error("%s: fdopen: %s", __func__, strerror(errno)); 651 close(p[0]); 652 /* Don't leave zombie child */ 653 kill(pid, SIGTERM); 654 while (waitpid(pid, NULL, 0) == -1 && errno == EINTR) 655 ; 656 goto out; 657 } 658 ok = check_authkeys_file(f, options.authorized_keys_command, key, pw); 659 fclose(f); 660 661 while (waitpid(pid, &status, 0) == -1) { 662 if (errno != EINTR) { 663 error("%s: waitpid: %s", __func__, strerror(errno)); 664 goto out; 665 } 666 } 667 if (WIFSIGNALED(status)) { 668 error("AuthorizedKeysCommand %s exited on signal %d", 669 options.authorized_keys_command, WTERMSIG(status)); 670 goto out; 671 } else if (WEXITSTATUS(status) != 0) { 672 error("AuthorizedKeysCommand %s returned status %d", 673 options.authorized_keys_command, WEXITSTATUS(status)); 674 goto out; 675 } 676 found_key = ok; 677 out: 678 restore_uid(); 679 return found_key; 680 } 681 682 /* 683 * Check whether key authenticates and authorises the user. 684 */ 685 int 686 user_key_allowed(struct passwd *pw, Key *key) 687 { 688 u_int success, i; 689 char *file; 690 691 if (auth_key_is_revoked(key)) 692 return 0; 693 if (key_is_cert(key) && auth_key_is_revoked(key->cert->signature_key)) 694 return 0; 695 696 success = user_cert_trusted_ca(pw, key); 697 if (success) 698 return success; 699 700 success = user_key_command_allowed2(pw, key); 701 if (success > 0) 702 return success; 703 704 for (i = 0; !success && i < options.num_authkeys_files; i++) { 705 706 if (strcasecmp(options.authorized_keys_files[i], "none") == 0) 707 continue; 708 file = expand_authorized_keys( 709 options.authorized_keys_files[i], pw); 710 711 success = user_key_allowed2(pw, key, file); 712 xfree(file); 713 } 714 715 return success; 716 } 717 718 Authmethod method_pubkey = { 719 "publickey", 720 userauth_pubkey, 721 &options.pubkey_authentication 722 }; 723