1 /* $OpenBSD: auth.c,v 1.113 2015/08/21 03:42:19 djm Exp $ */ 2 /* 3 * Copyright (c) 2000 Markus Friedl. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include "includes.h" 27 __RCSID("$FreeBSD$"); 28 29 #include <sys/types.h> 30 #include <sys/stat.h> 31 32 #include <netinet/in.h> 33 34 #include <errno.h> 35 #include <fcntl.h> 36 #ifdef HAVE_PATHS_H 37 # include <paths.h> 38 #endif 39 #include <pwd.h> 40 #ifdef HAVE_LOGIN_H 41 #include <login.h> 42 #endif 43 #ifdef USE_SHADOW 44 #include <shadow.h> 45 #endif 46 #ifdef HAVE_LIBGEN_H 47 #include <libgen.h> 48 #endif 49 #include <stdarg.h> 50 #include <stdio.h> 51 #include <string.h> 52 #include <unistd.h> 53 #include <limits.h> 54 55 #include "xmalloc.h" 56 #include "match.h" 57 #include "groupaccess.h" 58 #include "log.h" 59 #include "buffer.h" 60 #include "misc.h" 61 #include "servconf.h" 62 #include "key.h" 63 #include "hostfile.h" 64 #include "auth.h" 65 #include "auth-options.h" 66 #include "canohost.h" 67 #include "uidswap.h" 68 #include "packet.h" 69 #include "loginrec.h" 70 #ifdef GSSAPI 71 #include "ssh-gss.h" 72 #endif 73 #include "authfile.h" 74 #include "monitor_wrap.h" 75 #include "authfile.h" 76 #include "ssherr.h" 77 #include "compat.h" 78 #ifdef USE_BLACKLIST 79 #include "blacklist_client.h" 80 #endif 81 82 /* import */ 83 extern ServerOptions options; 84 extern int use_privsep; 85 extern Buffer loginmsg; 86 extern struct passwd *privsep_pw; 87 88 /* Debugging messages */ 89 Buffer auth_debug; 90 int auth_debug_init; 91 92 /* 93 * Check if the user is allowed to log in via ssh. If user is listed 94 * in DenyUsers or one of user's groups is listed in DenyGroups, false 95 * will be returned. If AllowUsers isn't empty and user isn't listed 96 * there, or if AllowGroups isn't empty and one of user's groups isn't 97 * listed there, false will be returned. 98 * If the user's shell is not executable, false will be returned. 99 * Otherwise true is returned. 100 */ 101 int 102 allowed_user(struct passwd * pw) 103 { 104 struct stat st; 105 const char *hostname = NULL, *ipaddr = NULL, *passwd = NULL; 106 u_int i; 107 #ifdef USE_SHADOW 108 struct spwd *spw = NULL; 109 #endif 110 111 /* Shouldn't be called if pw is NULL, but better safe than sorry... */ 112 if (!pw || !pw->pw_name) 113 return 0; 114 115 #ifdef USE_SHADOW 116 if (!options.use_pam) 117 spw = getspnam(pw->pw_name); 118 #ifdef HAS_SHADOW_EXPIRE 119 if (!options.use_pam && spw != NULL && auth_shadow_acctexpired(spw)) 120 return 0; 121 #endif /* HAS_SHADOW_EXPIRE */ 122 #endif /* USE_SHADOW */ 123 124 /* grab passwd field for locked account check */ 125 passwd = pw->pw_passwd; 126 #ifdef USE_SHADOW 127 if (spw != NULL) 128 #ifdef USE_LIBIAF 129 passwd = get_iaf_password(pw); 130 #else 131 passwd = spw->sp_pwdp; 132 #endif /* USE_LIBIAF */ 133 #endif 134 135 /* check for locked account */ 136 if (!options.use_pam && passwd && *passwd) { 137 int locked = 0; 138 139 #ifdef LOCKED_PASSWD_STRING 140 if (strcmp(passwd, LOCKED_PASSWD_STRING) == 0) 141 locked = 1; 142 #endif 143 #ifdef LOCKED_PASSWD_PREFIX 144 if (strncmp(passwd, LOCKED_PASSWD_PREFIX, 145 strlen(LOCKED_PASSWD_PREFIX)) == 0) 146 locked = 1; 147 #endif 148 #ifdef LOCKED_PASSWD_SUBSTR 149 if (strstr(passwd, LOCKED_PASSWD_SUBSTR)) 150 locked = 1; 151 #endif 152 #ifdef USE_LIBIAF 153 free((void *) passwd); 154 #endif /* USE_LIBIAF */ 155 if (locked) { 156 logit("User %.100s not allowed because account is locked", 157 pw->pw_name); 158 return 0; 159 } 160 } 161 162 /* 163 * Deny if shell does not exist or is not executable unless we 164 * are chrooting. 165 */ 166 if (options.chroot_directory == NULL || 167 strcasecmp(options.chroot_directory, "none") == 0) { 168 char *shell = xstrdup((pw->pw_shell[0] == '\0') ? 169 _PATH_BSHELL : pw->pw_shell); /* empty = /bin/sh */ 170 171 if (stat(shell, &st) != 0) { 172 logit("User %.100s not allowed because shell %.100s " 173 "does not exist", pw->pw_name, shell); 174 free(shell); 175 return 0; 176 } 177 if (S_ISREG(st.st_mode) == 0 || 178 (st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP)) == 0) { 179 logit("User %.100s not allowed because shell %.100s " 180 "is not executable", pw->pw_name, shell); 181 free(shell); 182 return 0; 183 } 184 free(shell); 185 } 186 187 if (options.num_deny_users > 0 || options.num_allow_users > 0 || 188 options.num_deny_groups > 0 || options.num_allow_groups > 0) { 189 hostname = get_canonical_hostname(options.use_dns); 190 ipaddr = get_remote_ipaddr(); 191 } 192 193 /* Return false if user is listed in DenyUsers */ 194 if (options.num_deny_users > 0) { 195 for (i = 0; i < options.num_deny_users; i++) 196 if (match_user(pw->pw_name, hostname, ipaddr, 197 options.deny_users[i])) { 198 logit("User %.100s from %.100s not allowed " 199 "because listed in DenyUsers", 200 pw->pw_name, hostname); 201 return 0; 202 } 203 } 204 /* Return false if AllowUsers isn't empty and user isn't listed there */ 205 if (options.num_allow_users > 0) { 206 for (i = 0; i < options.num_allow_users; i++) 207 if (match_user(pw->pw_name, hostname, ipaddr, 208 options.allow_users[i])) 209 break; 210 /* i < options.num_allow_users iff we break for loop */ 211 if (i >= options.num_allow_users) { 212 logit("User %.100s from %.100s not allowed because " 213 "not listed in AllowUsers", pw->pw_name, hostname); 214 return 0; 215 } 216 } 217 if (options.num_deny_groups > 0 || options.num_allow_groups > 0) { 218 /* Get the user's group access list (primary and supplementary) */ 219 if (ga_init(pw->pw_name, pw->pw_gid) == 0) { 220 logit("User %.100s from %.100s not allowed because " 221 "not in any group", pw->pw_name, hostname); 222 return 0; 223 } 224 225 /* Return false if one of user's groups is listed in DenyGroups */ 226 if (options.num_deny_groups > 0) 227 if (ga_match(options.deny_groups, 228 options.num_deny_groups)) { 229 ga_free(); 230 logit("User %.100s from %.100s not allowed " 231 "because a group is listed in DenyGroups", 232 pw->pw_name, hostname); 233 return 0; 234 } 235 /* 236 * Return false if AllowGroups isn't empty and one of user's groups 237 * isn't listed there 238 */ 239 if (options.num_allow_groups > 0) 240 if (!ga_match(options.allow_groups, 241 options.num_allow_groups)) { 242 ga_free(); 243 logit("User %.100s from %.100s not allowed " 244 "because none of user's groups are listed " 245 "in AllowGroups", pw->pw_name, hostname); 246 return 0; 247 } 248 ga_free(); 249 } 250 251 #ifdef CUSTOM_SYS_AUTH_ALLOWED_USER 252 if (!sys_auth_allowed_user(pw, &loginmsg)) 253 return 0; 254 #endif 255 256 /* We found no reason not to let this user try to log on... */ 257 return 1; 258 } 259 260 void 261 auth_info(Authctxt *authctxt, const char *fmt, ...) 262 { 263 va_list ap; 264 int i; 265 266 free(authctxt->info); 267 authctxt->info = NULL; 268 269 va_start(ap, fmt); 270 i = vasprintf(&authctxt->info, fmt, ap); 271 va_end(ap); 272 273 if (i < 0 || authctxt->info == NULL) 274 fatal("vasprintf failed"); 275 } 276 277 void 278 auth_log(Authctxt *authctxt, int authenticated, int partial, 279 const char *method, const char *submethod) 280 { 281 void (*authlog) (const char *fmt,...) = verbose; 282 char *authmsg; 283 284 if (use_privsep && !mm_is_monitor() && !authctxt->postponed) 285 return; 286 287 /* Raise logging level */ 288 if (authenticated == 1 || 289 !authctxt->valid || 290 authctxt->failures >= options.max_authtries / 2 || 291 strcmp(method, "password") == 0) 292 authlog = logit; 293 294 if (authctxt->postponed) 295 authmsg = "Postponed"; 296 else if (partial) 297 authmsg = "Partial"; 298 else 299 authmsg = authenticated ? "Accepted" : "Failed"; 300 301 authlog("%s %s%s%s for %s%.100s from %.200s port %d %s%s%s", 302 authmsg, 303 method, 304 submethod != NULL ? "/" : "", submethod == NULL ? "" : submethod, 305 authctxt->valid ? "" : "invalid user ", 306 authctxt->user, 307 get_remote_ipaddr(), 308 get_remote_port(), 309 compat20 ? "ssh2" : "ssh1", 310 authctxt->info != NULL ? ": " : "", 311 authctxt->info != NULL ? authctxt->info : ""); 312 #ifdef USE_BLACKLIST 313 if (!authctxt->postponed) 314 blacklist_notify(!authenticated); 315 #endif 316 free(authctxt->info); 317 authctxt->info = NULL; 318 319 #ifdef CUSTOM_FAILED_LOGIN 320 if (authenticated == 0 && !authctxt->postponed && 321 (strcmp(method, "password") == 0 || 322 strncmp(method, "keyboard-interactive", 20) == 0 || 323 strcmp(method, "challenge-response") == 0)) 324 record_failed_login(authctxt->user, 325 get_canonical_hostname(options.use_dns), "ssh"); 326 # ifdef WITH_AIXAUTHENTICATE 327 if (authenticated) 328 sys_auth_record_login(authctxt->user, 329 get_canonical_hostname(options.use_dns), "ssh", &loginmsg); 330 # endif 331 #endif 332 #ifdef SSH_AUDIT_EVENTS 333 if (authenticated == 0 && !authctxt->postponed) 334 audit_event(audit_classify_auth(method)); 335 #endif 336 } 337 338 339 void 340 auth_maxtries_exceeded(Authctxt *authctxt) 341 { 342 error("maximum authentication attempts exceeded for " 343 "%s%.100s from %.200s port %d %s", 344 authctxt->valid ? "" : "invalid user ", 345 authctxt->user, 346 get_remote_ipaddr(), 347 get_remote_port(), 348 compat20 ? "ssh2" : "ssh1"); 349 packet_disconnect("Too many authentication failures"); 350 /* NOTREACHED */ 351 } 352 353 /* 354 * Check whether root logins are disallowed. 355 */ 356 int 357 auth_root_allowed(const char *method) 358 { 359 switch (options.permit_root_login) { 360 case PERMIT_YES: 361 return 1; 362 case PERMIT_NO_PASSWD: 363 if (strcmp(method, "publickey") == 0 || 364 strcmp(method, "hostbased") == 0 || 365 strcmp(method, "gssapi-with-mic") == 0) 366 return 1; 367 break; 368 case PERMIT_FORCED_ONLY: 369 if (forced_command) { 370 logit("Root login accepted for forced command."); 371 return 1; 372 } 373 break; 374 } 375 logit("ROOT LOGIN REFUSED FROM %.200s", get_remote_ipaddr()); 376 return 0; 377 } 378 379 380 /* 381 * Given a template and a passwd structure, build a filename 382 * by substituting % tokenised options. Currently, %% becomes '%', 383 * %h becomes the home directory and %u the username. 384 * 385 * This returns a buffer allocated by xmalloc. 386 */ 387 char * 388 expand_authorized_keys(const char *filename, struct passwd *pw) 389 { 390 char *file, ret[PATH_MAX]; 391 int i; 392 393 file = percent_expand(filename, "h", pw->pw_dir, 394 "u", pw->pw_name, (char *)NULL); 395 396 /* 397 * Ensure that filename starts anchored. If not, be backward 398 * compatible and prepend the '%h/' 399 */ 400 if (*file == '/') 401 return (file); 402 403 i = snprintf(ret, sizeof(ret), "%s/%s", pw->pw_dir, file); 404 if (i < 0 || (size_t)i >= sizeof(ret)) 405 fatal("expand_authorized_keys: path too long"); 406 free(file); 407 return (xstrdup(ret)); 408 } 409 410 char * 411 authorized_principals_file(struct passwd *pw) 412 { 413 if (options.authorized_principals_file == NULL) 414 return NULL; 415 return expand_authorized_keys(options.authorized_principals_file, pw); 416 } 417 418 /* return ok if key exists in sysfile or userfile */ 419 HostStatus 420 check_key_in_hostfiles(struct passwd *pw, Key *key, const char *host, 421 const char *sysfile, const char *userfile) 422 { 423 char *user_hostfile; 424 struct stat st; 425 HostStatus host_status; 426 struct hostkeys *hostkeys; 427 const struct hostkey_entry *found; 428 429 hostkeys = init_hostkeys(); 430 load_hostkeys(hostkeys, host, sysfile); 431 if (userfile != NULL) { 432 user_hostfile = tilde_expand_filename(userfile, pw->pw_uid); 433 if (options.strict_modes && 434 (stat(user_hostfile, &st) == 0) && 435 ((st.st_uid != 0 && st.st_uid != pw->pw_uid) || 436 (st.st_mode & 022) != 0)) { 437 logit("Authentication refused for %.100s: " 438 "bad owner or modes for %.200s", 439 pw->pw_name, user_hostfile); 440 auth_debug_add("Ignored %.200s: bad ownership or modes", 441 user_hostfile); 442 } else { 443 temporarily_use_uid(pw); 444 load_hostkeys(hostkeys, host, user_hostfile); 445 restore_uid(); 446 } 447 free(user_hostfile); 448 } 449 host_status = check_key_in_hostkeys(hostkeys, key, &found); 450 if (host_status == HOST_REVOKED) 451 error("WARNING: revoked key for %s attempted authentication", 452 found->host); 453 else if (host_status == HOST_OK) 454 debug("%s: key for %s found at %s:%ld", __func__, 455 found->host, found->file, found->line); 456 else 457 debug("%s: key for host %s not found", __func__, host); 458 459 free_hostkeys(hostkeys); 460 461 return host_status; 462 } 463 464 /* 465 * Check a given path for security. This is defined as all components 466 * of the path to the file must be owned by either the owner of 467 * of the file or root and no directories must be group or world writable. 468 * 469 * XXX Should any specific check be done for sym links ? 470 * 471 * Takes a file name, its stat information (preferably from fstat() to 472 * avoid races), the uid of the expected owner, their home directory and an 473 * error buffer plus max size as arguments. 474 * 475 * Returns 0 on success and -1 on failure 476 */ 477 int 478 auth_secure_path(const char *name, struct stat *stp, const char *pw_dir, 479 uid_t uid, char *err, size_t errlen) 480 { 481 char buf[PATH_MAX], homedir[PATH_MAX]; 482 char *cp; 483 int comparehome = 0; 484 struct stat st; 485 486 if (realpath(name, buf) == NULL) { 487 snprintf(err, errlen, "realpath %s failed: %s", name, 488 strerror(errno)); 489 return -1; 490 } 491 if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL) 492 comparehome = 1; 493 494 if (!S_ISREG(stp->st_mode)) { 495 snprintf(err, errlen, "%s is not a regular file", buf); 496 return -1; 497 } 498 if ((!platform_sys_dir_uid(stp->st_uid) && stp->st_uid != uid) || 499 (stp->st_mode & 022) != 0) { 500 snprintf(err, errlen, "bad ownership or modes for file %s", 501 buf); 502 return -1; 503 } 504 505 /* for each component of the canonical path, walking upwards */ 506 for (;;) { 507 if ((cp = dirname(buf)) == NULL) { 508 snprintf(err, errlen, "dirname() failed"); 509 return -1; 510 } 511 strlcpy(buf, cp, sizeof(buf)); 512 513 if (stat(buf, &st) < 0 || 514 (!platform_sys_dir_uid(st.st_uid) && st.st_uid != uid) || 515 (st.st_mode & 022) != 0) { 516 snprintf(err, errlen, 517 "bad ownership or modes for directory %s", buf); 518 return -1; 519 } 520 521 /* If are past the homedir then we can stop */ 522 if (comparehome && strcmp(homedir, buf) == 0) 523 break; 524 525 /* 526 * dirname should always complete with a "/" path, 527 * but we can be paranoid and check for "." too 528 */ 529 if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0)) 530 break; 531 } 532 return 0; 533 } 534 535 /* 536 * Version of secure_path() that accepts an open file descriptor to 537 * avoid races. 538 * 539 * Returns 0 on success and -1 on failure 540 */ 541 static int 542 secure_filename(FILE *f, const char *file, struct passwd *pw, 543 char *err, size_t errlen) 544 { 545 struct stat st; 546 547 /* check the open file to avoid races */ 548 if (fstat(fileno(f), &st) < 0) { 549 snprintf(err, errlen, "cannot stat file %s: %s", 550 file, strerror(errno)); 551 return -1; 552 } 553 return auth_secure_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen); 554 } 555 556 static FILE * 557 auth_openfile(const char *file, struct passwd *pw, int strict_modes, 558 int log_missing, char *file_type) 559 { 560 char line[1024]; 561 struct stat st; 562 int fd; 563 FILE *f; 564 565 if ((fd = open(file, O_RDONLY|O_NONBLOCK)) == -1) { 566 if (log_missing || errno != ENOENT) 567 debug("Could not open %s '%s': %s", file_type, file, 568 strerror(errno)); 569 return NULL; 570 } 571 572 if (fstat(fd, &st) < 0) { 573 close(fd); 574 return NULL; 575 } 576 if (!S_ISREG(st.st_mode)) { 577 logit("User %s %s %s is not a regular file", 578 pw->pw_name, file_type, file); 579 close(fd); 580 return NULL; 581 } 582 unset_nonblock(fd); 583 if ((f = fdopen(fd, "r")) == NULL) { 584 close(fd); 585 return NULL; 586 } 587 if (strict_modes && 588 secure_filename(f, file, pw, line, sizeof(line)) != 0) { 589 fclose(f); 590 logit("Authentication refused: %s", line); 591 auth_debug_add("Ignored %s: %s", file_type, line); 592 return NULL; 593 } 594 595 return f; 596 } 597 598 599 FILE * 600 auth_openkeyfile(const char *file, struct passwd *pw, int strict_modes) 601 { 602 return auth_openfile(file, pw, strict_modes, 1, "authorized keys"); 603 } 604 605 FILE * 606 auth_openprincipals(const char *file, struct passwd *pw, int strict_modes) 607 { 608 return auth_openfile(file, pw, strict_modes, 0, 609 "authorized principals"); 610 } 611 612 struct passwd * 613 getpwnamallow(const char *user) 614 { 615 #ifdef HAVE_LOGIN_CAP 616 extern login_cap_t *lc; 617 #ifdef BSD_AUTH 618 auth_session_t *as; 619 #endif 620 #endif 621 struct passwd *pw; 622 struct connection_info *ci = get_connection_info(1, options.use_dns); 623 624 ci->user = user; 625 parse_server_match_config(&options, ci); 626 627 #if defined(_AIX) && defined(HAVE_SETAUTHDB) 628 aix_setauthdb(user); 629 #endif 630 631 pw = getpwnam(user); 632 633 #if defined(_AIX) && defined(HAVE_SETAUTHDB) 634 aix_restoreauthdb(); 635 #endif 636 #ifdef HAVE_CYGWIN 637 /* 638 * Windows usernames are case-insensitive. To avoid later problems 639 * when trying to match the username, the user is only allowed to 640 * login if the username is given in the same case as stored in the 641 * user database. 642 */ 643 if (pw != NULL && strcmp(user, pw->pw_name) != 0) { 644 logit("Login name %.100s does not match stored username %.100s", 645 user, pw->pw_name); 646 pw = NULL; 647 } 648 #endif 649 if (pw == NULL) { 650 #ifdef USE_BLACKLIST 651 blacklist_notify(1); 652 #endif 653 logit("Invalid user %.100s from %.100s", 654 user, get_remote_ipaddr()); 655 #ifdef CUSTOM_FAILED_LOGIN 656 record_failed_login(user, 657 get_canonical_hostname(options.use_dns), "ssh"); 658 #endif 659 #ifdef SSH_AUDIT_EVENTS 660 audit_event(SSH_INVALID_USER); 661 #endif /* SSH_AUDIT_EVENTS */ 662 return (NULL); 663 } 664 if (!allowed_user(pw)) 665 return (NULL); 666 #ifdef HAVE_LOGIN_CAP 667 if ((lc = login_getpwclass(pw)) == NULL) { 668 debug("unable to get login class: %s", user); 669 return (NULL); 670 } 671 #ifdef BSD_AUTH 672 if ((as = auth_open()) == NULL || auth_setpwd(as, pw) != 0 || 673 auth_approval(as, lc, pw->pw_name, "ssh") <= 0) { 674 debug("Approval failure for %s", user); 675 pw = NULL; 676 } 677 if (as != NULL) 678 auth_close(as); 679 #endif 680 #endif 681 if (pw != NULL) 682 return (pwcopy(pw)); 683 return (NULL); 684 } 685 686 /* Returns 1 if key is revoked by revoked_keys_file, 0 otherwise */ 687 int 688 auth_key_is_revoked(Key *key) 689 { 690 char *fp = NULL; 691 int r; 692 693 if (options.revoked_keys_file == NULL) 694 return 0; 695 if ((fp = sshkey_fingerprint(key, options.fingerprint_hash, 696 SSH_FP_DEFAULT)) == NULL) { 697 r = SSH_ERR_ALLOC_FAIL; 698 error("%s: fingerprint key: %s", __func__, ssh_err(r)); 699 goto out; 700 } 701 702 r = sshkey_check_revoked(key, options.revoked_keys_file); 703 switch (r) { 704 case 0: 705 break; /* not revoked */ 706 case SSH_ERR_KEY_REVOKED: 707 error("Authentication key %s %s revoked by file %s", 708 sshkey_type(key), fp, options.revoked_keys_file); 709 goto out; 710 default: 711 error("Error checking authentication key %s %s in " 712 "revoked keys file %s: %s", sshkey_type(key), fp, 713 options.revoked_keys_file, ssh_err(r)); 714 goto out; 715 } 716 717 /* Success */ 718 r = 0; 719 720 out: 721 free(fp); 722 return r == 0 ? 0 : 1; 723 } 724 725 void 726 auth_debug_add(const char *fmt,...) 727 { 728 char buf[1024]; 729 va_list args; 730 731 if (!auth_debug_init) 732 return; 733 734 va_start(args, fmt); 735 vsnprintf(buf, sizeof(buf), fmt, args); 736 va_end(args); 737 buffer_put_cstring(&auth_debug, buf); 738 } 739 740 void 741 auth_debug_send(void) 742 { 743 char *msg; 744 745 if (!auth_debug_init) 746 return; 747 while (buffer_len(&auth_debug)) { 748 msg = buffer_get_string(&auth_debug, NULL); 749 packet_send_debug("%s", msg); 750 free(msg); 751 } 752 } 753 754 void 755 auth_debug_reset(void) 756 { 757 if (auth_debug_init) 758 buffer_clear(&auth_debug); 759 else { 760 buffer_init(&auth_debug); 761 auth_debug_init = 1; 762 } 763 } 764 765 struct passwd * 766 fakepw(void) 767 { 768 static struct passwd fake; 769 770 memset(&fake, 0, sizeof(fake)); 771 fake.pw_name = "NOUSER"; 772 fake.pw_passwd = 773 "$2a$06$r3.juUaHZDlIbQaO2dS9FuYxL1W9M81R1Tc92PoSNmzvpEqLkLGrK"; 774 #ifdef HAVE_STRUCT_PASSWD_PW_GECOS 775 fake.pw_gecos = "NOUSER"; 776 #endif 777 fake.pw_uid = privsep_pw == NULL ? (uid_t)-1 : privsep_pw->pw_uid; 778 fake.pw_gid = privsep_pw == NULL ? (gid_t)-1 : privsep_pw->pw_gid; 779 #ifdef HAVE_STRUCT_PASSWD_PW_CLASS 780 fake.pw_class = ""; 781 #endif 782 fake.pw_dir = "/nonexist"; 783 fake.pw_shell = "/nonexist"; 784 785 return (&fake); 786 } 787