1 /* $OpenBSD: auth.c,v 1.110 2015/02/25 17:29:38 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 28 #include <sys/types.h> 29 #include <sys/stat.h> 30 31 #include <netinet/in.h> 32 33 #include <errno.h> 34 #include <fcntl.h> 35 #ifdef HAVE_PATHS_H 36 # include <paths.h> 37 #endif 38 #include <pwd.h> 39 #ifdef HAVE_LOGIN_H 40 #include <login.h> 41 #endif 42 #ifdef USE_SHADOW 43 #include <shadow.h> 44 #endif 45 #ifdef HAVE_LIBGEN_H 46 #include <libgen.h> 47 #endif 48 #include <stdarg.h> 49 #include <stdio.h> 50 #include <string.h> 51 #include <unistd.h> 52 #include <limits.h> 53 54 #include "xmalloc.h" 55 #include "match.h" 56 #include "groupaccess.h" 57 #include "log.h" 58 #include "buffer.h" 59 #include "misc.h" 60 #include "servconf.h" 61 #include "key.h" 62 #include "hostfile.h" 63 #include "auth.h" 64 #include "auth-options.h" 65 #include "canohost.h" 66 #include "uidswap.h" 67 #include "packet.h" 68 #include "loginrec.h" 69 #ifdef GSSAPI 70 #include "ssh-gss.h" 71 #endif 72 #include "authfile.h" 73 #include "monitor_wrap.h" 74 #include "authfile.h" 75 #include "ssherr.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 error("maximum authentication attempts exceeded 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 packet_disconnect("Too many authentication failures"); 342 /* NOTREACHED */ 343 } 344 345 /* 346 * Check whether root logins are disallowed. 347 */ 348 int 349 auth_root_allowed(const char *method) 350 { 351 switch (options.permit_root_login) { 352 case PERMIT_YES: 353 return 1; 354 case PERMIT_NO_PASSWD: 355 if (strcmp(method, "password") != 0) 356 return 1; 357 break; 358 case PERMIT_FORCED_ONLY: 359 if (forced_command) { 360 logit("Root login accepted for forced command."); 361 return 1; 362 } 363 break; 364 } 365 logit("ROOT LOGIN REFUSED FROM %.200s", get_remote_ipaddr()); 366 return 0; 367 } 368 369 370 /* 371 * Given a template and a passwd structure, build a filename 372 * by substituting % tokenised options. Currently, %% becomes '%', 373 * %h becomes the home directory and %u the username. 374 * 375 * This returns a buffer allocated by xmalloc. 376 */ 377 char * 378 expand_authorized_keys(const char *filename, struct passwd *pw) 379 { 380 char *file, ret[PATH_MAX]; 381 int i; 382 383 file = percent_expand(filename, "h", pw->pw_dir, 384 "u", pw->pw_name, (char *)NULL); 385 386 /* 387 * Ensure that filename starts anchored. If not, be backward 388 * compatible and prepend the '%h/' 389 */ 390 if (*file == '/') 391 return (file); 392 393 i = snprintf(ret, sizeof(ret), "%s/%s", pw->pw_dir, file); 394 if (i < 0 || (size_t)i >= sizeof(ret)) 395 fatal("expand_authorized_keys: path too long"); 396 free(file); 397 return (xstrdup(ret)); 398 } 399 400 char * 401 authorized_principals_file(struct passwd *pw) 402 { 403 if (options.authorized_principals_file == NULL || 404 strcasecmp(options.authorized_principals_file, "none") == 0) 405 return NULL; 406 return expand_authorized_keys(options.authorized_principals_file, pw); 407 } 408 409 /* return ok if key exists in sysfile or userfile */ 410 HostStatus 411 check_key_in_hostfiles(struct passwd *pw, Key *key, const char *host, 412 const char *sysfile, const char *userfile) 413 { 414 char *user_hostfile; 415 struct stat st; 416 HostStatus host_status; 417 struct hostkeys *hostkeys; 418 const struct hostkey_entry *found; 419 420 hostkeys = init_hostkeys(); 421 load_hostkeys(hostkeys, host, sysfile); 422 if (userfile != NULL) { 423 user_hostfile = tilde_expand_filename(userfile, pw->pw_uid); 424 if (options.strict_modes && 425 (stat(user_hostfile, &st) == 0) && 426 ((st.st_uid != 0 && st.st_uid != pw->pw_uid) || 427 (st.st_mode & 022) != 0)) { 428 logit("Authentication refused for %.100s: " 429 "bad owner or modes for %.200s", 430 pw->pw_name, user_hostfile); 431 auth_debug_add("Ignored %.200s: bad ownership or modes", 432 user_hostfile); 433 } else { 434 temporarily_use_uid(pw); 435 load_hostkeys(hostkeys, host, user_hostfile); 436 restore_uid(); 437 } 438 free(user_hostfile); 439 } 440 host_status = check_key_in_hostkeys(hostkeys, key, &found); 441 if (host_status == HOST_REVOKED) 442 error("WARNING: revoked key for %s attempted authentication", 443 found->host); 444 else if (host_status == HOST_OK) 445 debug("%s: key for %s found at %s:%ld", __func__, 446 found->host, found->file, found->line); 447 else 448 debug("%s: key for host %s not found", __func__, host); 449 450 free_hostkeys(hostkeys); 451 452 return host_status; 453 } 454 455 /* 456 * Check a given path for security. This is defined as all components 457 * of the path to the file must be owned by either the owner of 458 * of the file or root and no directories must be group or world writable. 459 * 460 * XXX Should any specific check be done for sym links ? 461 * 462 * Takes a file name, its stat information (preferably from fstat() to 463 * avoid races), the uid of the expected owner, their home directory and an 464 * error buffer plus max size as arguments. 465 * 466 * Returns 0 on success and -1 on failure 467 */ 468 int 469 auth_secure_path(const char *name, struct stat *stp, const char *pw_dir, 470 uid_t uid, char *err, size_t errlen) 471 { 472 char buf[PATH_MAX], homedir[PATH_MAX]; 473 char *cp; 474 int comparehome = 0; 475 struct stat st; 476 477 if (realpath(name, buf) == NULL) { 478 snprintf(err, errlen, "realpath %s failed: %s", name, 479 strerror(errno)); 480 return -1; 481 } 482 if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL) 483 comparehome = 1; 484 485 if (!S_ISREG(stp->st_mode)) { 486 snprintf(err, errlen, "%s is not a regular file", buf); 487 return -1; 488 } 489 if ((!platform_sys_dir_uid(stp->st_uid) && stp->st_uid != uid) || 490 (stp->st_mode & 022) != 0) { 491 #if defined(ANDROID) 492 /* needed to allow root login on Android. */ 493 if (getuid() != 0) 494 #endif 495 { 496 snprintf(err, errlen, "bad ownership or modes for file %s", 497 buf); 498 return -1; 499 } 500 } 501 502 /* for each component of the canonical path, walking upwards */ 503 for (;;) { 504 if ((cp = dirname(buf)) == NULL) { 505 snprintf(err, errlen, "dirname() failed"); 506 return -1; 507 } 508 strlcpy(buf, cp, sizeof(buf)); 509 510 #if !defined(ANDROID) 511 /* /data is owned by system user, which causes this check to fail */ 512 if (stat(buf, &st) < 0 || 513 (!platform_sys_dir_uid(st.st_uid) && st.st_uid != uid) || 514 (st.st_mode & 022) != 0) { 515 snprintf(err, errlen, 516 "bad ownership or modes for directory %s", buf); 517 return -1; 518 } 519 #endif 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 logit("Invalid user %.100s from %.100s", 651 user, get_remote_ipaddr()); 652 #ifdef CUSTOM_FAILED_LOGIN 653 record_failed_login(user, 654 get_canonical_hostname(options.use_dns), "ssh"); 655 #endif 656 #ifdef SSH_AUDIT_EVENTS 657 audit_event(SSH_INVALID_USER); 658 #endif /* SSH_AUDIT_EVENTS */ 659 return (NULL); 660 } 661 if (!allowed_user(pw)) 662 return (NULL); 663 #ifdef HAVE_LOGIN_CAP 664 if ((lc = login_getclass(pw->pw_class)) == NULL) { 665 debug("unable to get login class: %s", user); 666 return (NULL); 667 } 668 #ifdef BSD_AUTH 669 if ((as = auth_open()) == NULL || auth_setpwd(as, pw) != 0 || 670 auth_approval(as, lc, pw->pw_name, "ssh") <= 0) { 671 debug("Approval failure for %s", user); 672 pw = NULL; 673 } 674 if (as != NULL) 675 auth_close(as); 676 #endif 677 #endif 678 if (pw != NULL) 679 return (pwcopy(pw)); 680 return (NULL); 681 } 682 683 /* Returns 1 if key is revoked by revoked_keys_file, 0 otherwise */ 684 int 685 auth_key_is_revoked(Key *key) 686 { 687 char *fp = NULL; 688 int r; 689 690 if (options.revoked_keys_file == NULL) 691 return 0; 692 if ((fp = sshkey_fingerprint(key, options.fingerprint_hash, 693 SSH_FP_DEFAULT)) == NULL) { 694 r = SSH_ERR_ALLOC_FAIL; 695 error("%s: fingerprint key: %s", __func__, ssh_err(r)); 696 goto out; 697 } 698 699 r = sshkey_check_revoked(key, options.revoked_keys_file); 700 switch (r) { 701 case 0: 702 break; /* not revoked */ 703 case SSH_ERR_KEY_REVOKED: 704 error("Authentication key %s %s revoked by file %s", 705 sshkey_type(key), fp, options.revoked_keys_file); 706 goto out; 707 default: 708 error("Error checking authentication key %s %s in " 709 "revoked keys file %s: %s", sshkey_type(key), fp, 710 options.revoked_keys_file, ssh_err(r)); 711 goto out; 712 } 713 714 /* Success */ 715 r = 0; 716 717 out: 718 free(fp); 719 return r == 0 ? 0 : 1; 720 } 721 722 void 723 auth_debug_add(const char *fmt,...) 724 { 725 char buf[1024]; 726 va_list args; 727 728 if (!auth_debug_init) 729 return; 730 731 va_start(args, fmt); 732 vsnprintf(buf, sizeof(buf), fmt, args); 733 va_end(args); 734 buffer_put_cstring(&auth_debug, buf); 735 } 736 737 void 738 auth_debug_send(void) 739 { 740 char *msg; 741 742 if (!auth_debug_init) 743 return; 744 while (buffer_len(&auth_debug)) { 745 msg = buffer_get_string(&auth_debug, NULL); 746 packet_send_debug("%s", msg); 747 free(msg); 748 } 749 } 750 751 void 752 auth_debug_reset(void) 753 { 754 if (auth_debug_init) 755 buffer_clear(&auth_debug); 756 else { 757 buffer_init(&auth_debug); 758 auth_debug_init = 1; 759 } 760 } 761 762 struct passwd * 763 fakepw(void) 764 { 765 static struct passwd fake; 766 767 memset(&fake, 0, sizeof(fake)); 768 fake.pw_name = "NOUSER"; 769 fake.pw_passwd = 770 "$2a$06$r3.juUaHZDlIbQaO2dS9FuYxL1W9M81R1Tc92PoSNmzvpEqLkLGrK"; 771 #ifdef HAVE_STRUCT_PASSWD_PW_GECOS 772 fake.pw_gecos = "NOUSER"; 773 #endif 774 fake.pw_uid = privsep_pw == NULL ? (uid_t)-1 : privsep_pw->pw_uid; 775 fake.pw_gid = privsep_pw == NULL ? (gid_t)-1 : privsep_pw->pw_gid; 776 #ifdef HAVE_STRUCT_PASSWD_PW_CLASS 777 fake.pw_class = ""; 778 #endif 779 fake.pw_dir = "/nonexist"; 780 fake.pw_shell = "/nonexist"; 781 782 return (&fake); 783 } 784
