1 /* $OpenBSD: auth.c,v 1.106 2014/07/15 15:54:14 millert 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 #include <sys/param.h> 32 33 #include <netinet/in.h> 34 35 #include <errno.h> 36 #include <fcntl.h> 37 #ifdef HAVE_PATHS_H 38 # include <paths.h> 39 #endif 40 #include <pwd.h> 41 #ifdef HAVE_LOGIN_H 42 #include <login.h> 43 #endif 44 #ifdef USE_SHADOW 45 #include <shadow.h> 46 #endif 47 #ifdef HAVE_LIBGEN_H 48 #include <libgen.h> 49 #endif 50 #include <stdarg.h> 51 #include <stdio.h> 52 #include <string.h> 53 #include <unistd.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 "krl.h" 76 #include "compat.h" 77 78 /* import */ 79 extern ServerOptions options; 80 extern int use_privsep; 81 extern Buffer loginmsg; 82 extern struct passwd *privsep_pw; 83 84 /* Debugging messages */ 85 Buffer auth_debug; 86 int auth_debug_init; 87 88 /* 89 * Check if the user is allowed to log in via ssh. If user is listed 90 * in DenyUsers or one of user's groups is listed in DenyGroups, false 91 * will be returned. If AllowUsers isn't empty and user isn't listed 92 * there, or if AllowGroups isn't empty and one of user's groups isn't 93 * listed there, false will be returned. 94 * If the user's shell is not executable, false will be returned. 95 * Otherwise true is returned. 96 */ 97 int 98 allowed_user(struct passwd * pw) 99 { 100 struct stat st; 101 const char *hostname = NULL, *ipaddr = NULL, *passwd = NULL; 102 u_int i; 103 #ifdef USE_SHADOW 104 struct spwd *spw = NULL; 105 #endif 106 107 /* Shouldn't be called if pw is NULL, but better safe than sorry... */ 108 if (!pw || !pw->pw_name) 109 return 0; 110 111 #ifdef USE_SHADOW 112 if (!options.use_pam) 113 spw = getspnam(pw->pw_name); 114 #ifdef HAS_SHADOW_EXPIRE 115 if (!options.use_pam && spw != NULL && auth_shadow_acctexpired(spw)) 116 return 0; 117 #endif /* HAS_SHADOW_EXPIRE */ 118 #endif /* USE_SHADOW */ 119 120 /* grab passwd field for locked account check */ 121 passwd = pw->pw_passwd; 122 #ifdef USE_SHADOW 123 if (spw != NULL) 124 #ifdef USE_LIBIAF 125 passwd = get_iaf_password(pw); 126 #else 127 passwd = spw->sp_pwdp; 128 #endif /* USE_LIBIAF */ 129 #endif 130 131 /* check for locked account */ 132 if (!options.use_pam && passwd && *passwd) { 133 int locked = 0; 134 135 #ifdef LOCKED_PASSWD_STRING 136 if (strcmp(passwd, LOCKED_PASSWD_STRING) == 0) 137 locked = 1; 138 #endif 139 #ifdef LOCKED_PASSWD_PREFIX 140 if (strncmp(passwd, LOCKED_PASSWD_PREFIX, 141 strlen(LOCKED_PASSWD_PREFIX)) == 0) 142 locked = 1; 143 #endif 144 #ifdef LOCKED_PASSWD_SUBSTR 145 if (strstr(passwd, LOCKED_PASSWD_SUBSTR)) 146 locked = 1; 147 #endif 148 #ifdef USE_LIBIAF 149 free((void *) passwd); 150 #endif /* USE_LIBIAF */ 151 if (locked) { 152 logit("User %.100s not allowed because account is locked", 153 pw->pw_name); 154 return 0; 155 } 156 } 157 158 /* 159 * Deny if shell does not exist or is not executable unless we 160 * are chrooting. 161 */ 162 if (options.chroot_directory == NULL || 163 strcasecmp(options.chroot_directory, "none") == 0) { 164 char *shell = xstrdup((pw->pw_shell[0] == '\0') ? 165 _PATH_BSHELL : pw->pw_shell); /* empty = /bin/sh */ 166 167 if (stat(shell, &st) != 0) { 168 logit("User %.100s not allowed because shell %.100s " 169 "does not exist", pw->pw_name, shell); 170 free(shell); 171 return 0; 172 } 173 if (S_ISREG(st.st_mode) == 0 || 174 (st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP)) == 0) { 175 logit("User %.100s not allowed because shell %.100s " 176 "is not executable", pw->pw_name, shell); 177 free(shell); 178 return 0; 179 } 180 free(shell); 181 } 182 183 if (options.num_deny_users > 0 || options.num_allow_users > 0 || 184 options.num_deny_groups > 0 || options.num_allow_groups > 0) { 185 hostname = get_canonical_hostname(options.use_dns); 186 ipaddr = get_remote_ipaddr(); 187 } 188 189 /* Return false if user is listed in DenyUsers */ 190 if (options.num_deny_users > 0) { 191 for (i = 0; i < options.num_deny_users; i++) 192 if (match_user(pw->pw_name, hostname, ipaddr, 193 options.deny_users[i])) { 194 logit("User %.100s from %.100s not allowed " 195 "because listed in DenyUsers", 196 pw->pw_name, hostname); 197 return 0; 198 } 199 } 200 /* Return false if AllowUsers isn't empty and user isn't listed there */ 201 if (options.num_allow_users > 0) { 202 for (i = 0; i < options.num_allow_users; i++) 203 if (match_user(pw->pw_name, hostname, ipaddr, 204 options.allow_users[i])) 205 break; 206 /* i < options.num_allow_users iff we break for loop */ 207 if (i >= options.num_allow_users) { 208 logit("User %.100s from %.100s not allowed because " 209 "not listed in AllowUsers", pw->pw_name, hostname); 210 return 0; 211 } 212 } 213 if (options.num_deny_groups > 0 || options.num_allow_groups > 0) { 214 /* Get the user's group access list (primary and supplementary) */ 215 if (ga_init(pw->pw_name, pw->pw_gid) == 0) { 216 logit("User %.100s from %.100s not allowed because " 217 "not in any group", pw->pw_name, hostname); 218 return 0; 219 } 220 221 /* Return false if one of user's groups is listed in DenyGroups */ 222 if (options.num_deny_groups > 0) 223 if (ga_match(options.deny_groups, 224 options.num_deny_groups)) { 225 ga_free(); 226 logit("User %.100s from %.100s not allowed " 227 "because a group is listed in DenyGroups", 228 pw->pw_name, hostname); 229 return 0; 230 } 231 /* 232 * Return false if AllowGroups isn't empty and one of user's groups 233 * isn't listed there 234 */ 235 if (options.num_allow_groups > 0) 236 if (!ga_match(options.allow_groups, 237 options.num_allow_groups)) { 238 ga_free(); 239 logit("User %.100s from %.100s not allowed " 240 "because none of user's groups are listed " 241 "in AllowGroups", pw->pw_name, hostname); 242 return 0; 243 } 244 ga_free(); 245 } 246 247 #ifdef CUSTOM_SYS_AUTH_ALLOWED_USER 248 if (!sys_auth_allowed_user(pw, &loginmsg)) 249 return 0; 250 #endif 251 252 /* We found no reason not to let this user try to log on... */ 253 return 1; 254 } 255 256 void 257 auth_info(Authctxt *authctxt, const char *fmt, ...) 258 { 259 va_list ap; 260 int i; 261 262 free(authctxt->info); 263 authctxt->info = NULL; 264 265 va_start(ap, fmt); 266 i = vasprintf(&authctxt->info, fmt, ap); 267 va_end(ap); 268 269 if (i < 0 || authctxt->info == NULL) 270 fatal("vasprintf failed"); 271 } 272 273 void 274 auth_log(Authctxt *authctxt, int authenticated, int partial, 275 const char *method, const char *submethod) 276 { 277 void (*authlog) (const char *fmt,...) = verbose; 278 char *authmsg; 279 280 if (use_privsep && !mm_is_monitor() && !authctxt->postponed) 281 return; 282 283 /* Raise logging level */ 284 if (authenticated == 1 || 285 !authctxt->valid || 286 authctxt->failures >= options.max_authtries / 2 || 287 strcmp(method, "password") == 0) 288 authlog = logit; 289 290 if (authctxt->postponed) 291 authmsg = "Postponed"; 292 else if (partial) 293 authmsg = "Partial"; 294 else 295 authmsg = authenticated ? "Accepted" : "Failed"; 296 297 authlog("%s %s%s%s for %s%.100s from %.200s port %d %s%s%s", 298 authmsg, 299 method, 300 submethod != NULL ? "/" : "", submethod == NULL ? "" : submethod, 301 authctxt->valid ? "" : "invalid user ", 302 authctxt->user, 303 get_remote_ipaddr(), 304 get_remote_port(), 305 compat20 ? "ssh2" : "ssh1", 306 authctxt->info != NULL ? ": " : "", 307 authctxt->info != NULL ? authctxt->info : ""); 308 free(authctxt->info); 309 authctxt->info = NULL; 310 311 #ifdef CUSTOM_FAILED_LOGIN 312 if (authenticated == 0 && !authctxt->postponed && 313 (strcmp(method, "password") == 0 || 314 strncmp(method, "keyboard-interactive", 20) == 0 || 315 strcmp(method, "challenge-response") == 0)) 316 record_failed_login(authctxt->user, 317 get_canonical_hostname(options.use_dns), "ssh"); 318 # ifdef WITH_AIXAUTHENTICATE 319 if (authenticated) 320 sys_auth_record_login(authctxt->user, 321 get_canonical_hostname(options.use_dns), "ssh", &loginmsg); 322 # endif 323 #endif 324 #ifdef SSH_AUDIT_EVENTS 325 if (authenticated == 0 && !authctxt->postponed) 326 audit_event(audit_classify_auth(method)); 327 #endif 328 } 329 330 331 void 332 auth_maxtries_exceeded(Authctxt *authctxt) 333 { 334 packet_disconnect("Too many authentication failures for " 335 "%s%.100s from %.200s port %d %s", 336 authctxt->valid ? "" : "invalid user ", 337 authctxt->user, 338 get_remote_ipaddr(), 339 get_remote_port(), 340 compat20 ? "ssh2" : "ssh1"); 341 /* NOTREACHED */ 342 } 343 344 /* 345 * Check whether root logins are disallowed. 346 */ 347 int 348 auth_root_allowed(const char *method) 349 { 350 switch (options.permit_root_login) { 351 case PERMIT_YES: 352 return 1; 353 case PERMIT_NO_PASSWD: 354 if (strcmp(method, "password") != 0) 355 return 1; 356 break; 357 case PERMIT_FORCED_ONLY: 358 if (forced_command) { 359 logit("Root login accepted for forced command."); 360 return 1; 361 } 362 break; 363 } 364 logit("ROOT LOGIN REFUSED FROM %.200s", get_remote_ipaddr()); 365 return 0; 366 } 367 368 369 /* 370 * Given a template and a passwd structure, build a filename 371 * by substituting % tokenised options. Currently, %% becomes '%', 372 * %h becomes the home directory and %u the username. 373 * 374 * This returns a buffer allocated by xmalloc. 375 */ 376 char * 377 expand_authorized_keys(const char *filename, struct passwd *pw) 378 { 379 char *file, ret[MAXPATHLEN]; 380 int i; 381 382 file = percent_expand(filename, "h", pw->pw_dir, 383 "u", pw->pw_name, (char *)NULL); 384 385 /* 386 * Ensure that filename starts anchored. If not, be backward 387 * compatible and prepend the '%h/' 388 */ 389 if (*file == '/') 390 return (file); 391 392 i = snprintf(ret, sizeof(ret), "%s/%s", pw->pw_dir, file); 393 if (i < 0 || (size_t)i >= sizeof(ret)) 394 fatal("expand_authorized_keys: path too long"); 395 free(file); 396 return (xstrdup(ret)); 397 } 398 399 char * 400 authorized_principals_file(struct passwd *pw) 401 { 402 if (options.authorized_principals_file == NULL || 403 strcasecmp(options.authorized_principals_file, "none") == 0) 404 return NULL; 405 return expand_authorized_keys(options.authorized_principals_file, pw); 406 } 407 408 /* return ok if key exists in sysfile or userfile */ 409 HostStatus 410 check_key_in_hostfiles(struct passwd *pw, Key *key, const char *host, 411 const char *sysfile, const char *userfile) 412 { 413 char *user_hostfile; 414 struct stat st; 415 HostStatus host_status; 416 struct hostkeys *hostkeys; 417 const struct hostkey_entry *found; 418 419 hostkeys = init_hostkeys(); 420 load_hostkeys(hostkeys, host, sysfile); 421 if (userfile != NULL) { 422 user_hostfile = tilde_expand_filename(userfile, pw->pw_uid); 423 if (options.strict_modes && 424 (stat(user_hostfile, &st) == 0) && 425 ((st.st_uid != 0 && st.st_uid != pw->pw_uid) || 426 (st.st_mode & 022) != 0)) { 427 logit("Authentication refused for %.100s: " 428 "bad owner or modes for %.200s", 429 pw->pw_name, user_hostfile); 430 auth_debug_add("Ignored %.200s: bad ownership or modes", 431 user_hostfile); 432 } else { 433 temporarily_use_uid(pw); 434 load_hostkeys(hostkeys, host, user_hostfile); 435 restore_uid(); 436 } 437 free(user_hostfile); 438 } 439 host_status = check_key_in_hostkeys(hostkeys, key, &found); 440 if (host_status == HOST_REVOKED) 441 error("WARNING: revoked key for %s attempted authentication", 442 found->host); 443 else if (host_status == HOST_OK) 444 debug("%s: key for %s found at %s:%ld", __func__, 445 found->host, found->file, found->line); 446 else 447 debug("%s: key for host %s not found", __func__, host); 448 449 free_hostkeys(hostkeys); 450 451 return host_status; 452 } 453 454 /* 455 * Check a given path for security. This is defined as all components 456 * of the path to the file must be owned by either the owner of 457 * of the file or root and no directories must be group or world writable. 458 * 459 * XXX Should any specific check be done for sym links ? 460 * 461 * Takes a file name, its stat information (preferably from fstat() to 462 * avoid races), the uid of the expected owner, their home directory and an 463 * error buffer plus max size as arguments. 464 * 465 * Returns 0 on success and -1 on failure 466 */ 467 int 468 auth_secure_path(const char *name, struct stat *stp, const char *pw_dir, 469 uid_t uid, char *err, size_t errlen) 470 { 471 char buf[MAXPATHLEN], homedir[MAXPATHLEN]; 472 char *cp; 473 int comparehome = 0; 474 struct stat st; 475 476 if (realpath(name, buf) == NULL) { 477 snprintf(err, errlen, "realpath %s failed: %s", name, 478 strerror(errno)); 479 return -1; 480 } 481 if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL) 482 comparehome = 1; 483 484 if (!S_ISREG(stp->st_mode)) { 485 snprintf(err, errlen, "%s is not a regular file", buf); 486 return -1; 487 } 488 if ((!platform_sys_dir_uid(stp->st_uid) && stp->st_uid != uid) || 489 (stp->st_mode & 022) != 0) { 490 snprintf(err, errlen, "bad ownership or modes for file %s", 491 buf); 492 return -1; 493 } 494 495 /* for each component of the canonical path, walking upwards */ 496 for (;;) { 497 if ((cp = dirname(buf)) == NULL) { 498 snprintf(err, errlen, "dirname() failed"); 499 return -1; 500 } 501 strlcpy(buf, cp, sizeof(buf)); 502 503 if (stat(buf, &st) < 0 || 504 (!platform_sys_dir_uid(st.st_uid) && st.st_uid != uid) || 505 (st.st_mode & 022) != 0) { 506 snprintf(err, errlen, 507 "bad ownership or modes for directory %s", buf); 508 return -1; 509 } 510 511 /* If are past the homedir then we can stop */ 512 if (comparehome && strcmp(homedir, buf) == 0) 513 break; 514 515 /* 516 * dirname should always complete with a "/" path, 517 * but we can be paranoid and check for "." too 518 */ 519 if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0)) 520 break; 521 } 522 return 0; 523 } 524 525 /* 526 * Version of secure_path() that accepts an open file descriptor to 527 * avoid races. 528 * 529 * Returns 0 on success and -1 on failure 530 */ 531 static int 532 secure_filename(FILE *f, const char *file, struct passwd *pw, 533 char *err, size_t errlen) 534 { 535 struct stat st; 536 537 /* check the open file to avoid races */ 538 if (fstat(fileno(f), &st) < 0) { 539 snprintf(err, errlen, "cannot stat file %s: %s", 540 file, strerror(errno)); 541 return -1; 542 } 543 return auth_secure_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen); 544 } 545 546 static FILE * 547 auth_openfile(const char *file, struct passwd *pw, int strict_modes, 548 int log_missing, char *file_type) 549 { 550 char line[1024]; 551 struct stat st; 552 int fd; 553 FILE *f; 554 555 if ((fd = open(file, O_RDONLY|O_NONBLOCK)) == -1) { 556 if (log_missing || errno != ENOENT) 557 debug("Could not open %s '%s': %s", file_type, file, 558 strerror(errno)); 559 return NULL; 560 } 561 562 if (fstat(fd, &st) < 0) { 563 close(fd); 564 return NULL; 565 } 566 if (!S_ISREG(st.st_mode)) { 567 logit("User %s %s %s is not a regular file", 568 pw->pw_name, file_type, file); 569 close(fd); 570 return NULL; 571 } 572 unset_nonblock(fd); 573 if ((f = fdopen(fd, "r")) == NULL) { 574 close(fd); 575 return NULL; 576 } 577 if (strict_modes && 578 secure_filename(f, file, pw, line, sizeof(line)) != 0) { 579 fclose(f); 580 logit("Authentication refused: %s", line); 581 auth_debug_add("Ignored %s: %s", file_type, line); 582 return NULL; 583 } 584 585 return f; 586 } 587 588 589 FILE * 590 auth_openkeyfile(const char *file, struct passwd *pw, int strict_modes) 591 { 592 return auth_openfile(file, pw, strict_modes, 1, "authorized keys"); 593 } 594 595 FILE * 596 auth_openprincipals(const char *file, struct passwd *pw, int strict_modes) 597 { 598 return auth_openfile(file, pw, strict_modes, 0, 599 "authorized principals"); 600 } 601 602 struct passwd * 603 getpwnamallow(const char *user) 604 { 605 #ifdef HAVE_LOGIN_CAP 606 extern login_cap_t *lc; 607 #ifdef BSD_AUTH 608 auth_session_t *as; 609 #endif 610 #endif 611 struct passwd *pw; 612 struct connection_info *ci = get_connection_info(1, options.use_dns); 613 614 ci->user = user; 615 parse_server_match_config(&options, ci); 616 617 #if defined(_AIX) && defined(HAVE_SETAUTHDB) 618 aix_setauthdb(user); 619 #endif 620 621 pw = getpwnam(user); 622 623 #if defined(_AIX) && defined(HAVE_SETAUTHDB) 624 aix_restoreauthdb(); 625 #endif 626 #ifdef HAVE_CYGWIN 627 /* 628 * Windows usernames are case-insensitive. To avoid later problems 629 * when trying to match the username, the user is only allowed to 630 * login if the username is given in the same case as stored in the 631 * user database. 632 */ 633 if (pw != NULL && strcmp(user, pw->pw_name) != 0) { 634 logit("Login name %.100s does not match stored username %.100s", 635 user, pw->pw_name); 636 pw = NULL; 637 } 638 #endif 639 if (pw == NULL) { 640 logit("Invalid user %.100s from %.100s", 641 user, get_remote_ipaddr()); 642 #ifdef CUSTOM_FAILED_LOGIN 643 record_failed_login(user, 644 get_canonical_hostname(options.use_dns), "ssh"); 645 #endif 646 #ifdef SSH_AUDIT_EVENTS 647 audit_event(SSH_INVALID_USER); 648 #endif /* SSH_AUDIT_EVENTS */ 649 return (NULL); 650 } 651 if (!allowed_user(pw)) 652 return (NULL); 653 #ifdef HAVE_LOGIN_CAP 654 if ((lc = login_getpwclass(pw)) == NULL) { 655 debug("unable to get login class: %s", user); 656 return (NULL); 657 } 658 #ifdef BSD_AUTH 659 if ((as = auth_open()) == NULL || auth_setpwd(as, pw) != 0 || 660 auth_approval(as, lc, pw->pw_name, "ssh") <= 0) { 661 debug("Approval failure for %s", user); 662 pw = NULL; 663 } 664 if (as != NULL) 665 auth_close(as); 666 #endif 667 #endif 668 if (pw != NULL) 669 return (pwcopy(pw)); 670 return (NULL); 671 } 672 673 /* Returns 1 if key is revoked by revoked_keys_file, 0 otherwise */ 674 int 675 auth_key_is_revoked(Key *key) 676 { 677 #ifdef WITH_OPENSSL 678 char *key_fp; 679 680 if (options.revoked_keys_file == NULL) 681 return 0; 682 switch (ssh_krl_file_contains_key(options.revoked_keys_file, key)) { 683 case 0: 684 return 0; /* Not revoked */ 685 case -2: 686 break; /* Not a KRL */ 687 default: 688 goto revoked; 689 } 690 #endif 691 debug3("%s: treating %s as a key list", __func__, 692 options.revoked_keys_file); 693 switch (key_in_file(key, options.revoked_keys_file, 0)) { 694 case 0: 695 /* key not revoked */ 696 return 0; 697 case -1: 698 /* Error opening revoked_keys_file: refuse all keys */ 699 error("Revoked keys file is unreadable: refusing public key " 700 "authentication"); 701 return 1; 702 #ifdef WITH_OPENSSL 703 case 1: 704 revoked: 705 /* Key revoked */ 706 key_fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); 707 error("WARNING: authentication attempt with a revoked " 708 "%s key %s ", key_type(key), key_fp); 709 free(key_fp); 710 return 1; 711 #endif 712 } 713 fatal("key_in_file returned junk"); 714 } 715 716 void 717 auth_debug_add(const char *fmt,...) 718 { 719 char buf[1024]; 720 va_list args; 721 722 if (!auth_debug_init) 723 return; 724 725 va_start(args, fmt); 726 vsnprintf(buf, sizeof(buf), fmt, args); 727 va_end(args); 728 buffer_put_cstring(&auth_debug, buf); 729 } 730 731 void 732 auth_debug_send(void) 733 { 734 char *msg; 735 736 if (!auth_debug_init) 737 return; 738 while (buffer_len(&auth_debug)) { 739 msg = buffer_get_string(&auth_debug, NULL); 740 packet_send_debug("%s", msg); 741 free(msg); 742 } 743 } 744 745 void 746 auth_debug_reset(void) 747 { 748 if (auth_debug_init) 749 buffer_clear(&auth_debug); 750 else { 751 buffer_init(&auth_debug); 752 auth_debug_init = 1; 753 } 754 } 755 756 struct passwd * 757 fakepw(void) 758 { 759 static struct passwd fake; 760 761 memset(&fake, 0, sizeof(fake)); 762 fake.pw_name = "NOUSER"; 763 fake.pw_passwd = 764 "$2a$06$r3.juUaHZDlIbQaO2dS9FuYxL1W9M81R1Tc92PoSNmzvpEqLkLGrK"; 765 #ifdef HAVE_STRUCT_PASSWD_PW_GECOS 766 fake.pw_gecos = "NOUSER"; 767 #endif 768 fake.pw_uid = privsep_pw == NULL ? (uid_t)-1 : privsep_pw->pw_uid; 769 fake.pw_gid = privsep_pw == NULL ? (gid_t)-1 : privsep_pw->pw_gid; 770 #ifdef HAVE_STRUCT_PASSWD_PW_CLASS 771 fake.pw_class = ""; 772 #endif 773 fake.pw_dir = "/nonexist"; 774 fake.pw_shell = "/nonexist"; 775 776 return (&fake); 777 } 778