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 28 #include <sys/types.h> 29 #include <sys/stat.h> 30 #include <sys/param.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 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 "krl.h" 75 #include "compat.h" 76 77 /* import */ 78 extern ServerOptions options; 79 extern int use_privsep; 80 extern Buffer loginmsg; 81 extern struct passwd *privsep_pw; 82 83 /* Debugging messages */ 84 Buffer auth_debug; 85 int auth_debug_init; 86 87 /* 88 * Check if the user is allowed to log in via ssh. If user is listed 89 * in DenyUsers or one of user's groups is listed in DenyGroups, false 90 * will be returned. If AllowUsers isn't empty and user isn't listed 91 * there, or if AllowGroups isn't empty and one of user's groups isn't 92 * listed there, false will be returned. 93 * If the user's shell is not executable, false will be returned. 94 * Otherwise true is returned. 95 */ 96 int 97 allowed_user(struct passwd * pw) 98 { 99 struct stat st; 100 const char *hostname = NULL, *ipaddr = NULL, *passwd = NULL; 101 u_int i; 102 #ifdef USE_SHADOW 103 struct spwd *spw = NULL; 104 #endif 105 106 /* Shouldn't be called if pw is NULL, but better safe than sorry... */ 107 if (!pw || !pw->pw_name) 108 return 0; 109 110 #ifdef USE_SHADOW 111 if (!options.use_pam) 112 spw = getspnam(pw->pw_name); 113 #ifdef HAS_SHADOW_EXPIRE 114 if (!options.use_pam && spw != NULL && auth_shadow_acctexpired(spw)) 115 return 0; 116 #endif /* HAS_SHADOW_EXPIRE */ 117 #endif /* USE_SHADOW */ 118 119 /* grab passwd field for locked account check */ 120 passwd = pw->pw_passwd; 121 #ifdef USE_SHADOW 122 if (spw != NULL) 123 #ifdef USE_LIBIAF 124 passwd = get_iaf_password(pw); 125 #else 126 passwd = spw->sp_pwdp; 127 #endif /* USE_LIBIAF */ 128 #endif 129 130 /* check for locked account */ 131 if (!options.use_pam && passwd && *passwd) { 132 int locked = 0; 133 134 #ifdef LOCKED_PASSWD_STRING 135 if (strcmp(passwd, LOCKED_PASSWD_STRING) == 0) 136 locked = 1; 137 #endif 138 #ifdef LOCKED_PASSWD_PREFIX 139 if (strncmp(passwd, LOCKED_PASSWD_PREFIX, 140 strlen(LOCKED_PASSWD_PREFIX)) == 0) 141 locked = 1; 142 #endif 143 #ifdef LOCKED_PASSWD_SUBSTR 144 if (strstr(passwd, LOCKED_PASSWD_SUBSTR)) 145 locked = 1; 146 #endif 147 #ifdef USE_LIBIAF 148 free((void *) passwd); 149 #endif /* USE_LIBIAF */ 150 if (locked) { 151 logit("User %.100s not allowed because account is locked", 152 pw->pw_name); 153 return 0; 154 } 155 } 156 157 /* 158 * Deny if shell does not exist or is not executable unless we 159 * are chrooting. 160 */ 161 if (options.chroot_directory == NULL || 162 strcasecmp(options.chroot_directory, "none") == 0) { 163 char *shell = xstrdup((pw->pw_shell[0] == '\0') ? 164 _PATH_BSHELL : pw->pw_shell); /* empty = /bin/sh */ 165 166 if (stat(shell, &st) != 0) { 167 logit("User %.100s not allowed because shell %.100s " 168 "does not exist", pw->pw_name, shell); 169 free(shell); 170 return 0; 171 } 172 if (S_ISREG(st.st_mode) == 0 || 173 (st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP)) == 0) { 174 logit("User %.100s not allowed because shell %.100s " 175 "is not executable", pw->pw_name, shell); 176 free(shell); 177 return 0; 178 } 179 free(shell); 180 } 181 182 if (options.num_deny_users > 0 || options.num_allow_users > 0 || 183 options.num_deny_groups > 0 || options.num_allow_groups > 0) { 184 hostname = get_canonical_hostname(options.use_dns); 185 ipaddr = get_remote_ipaddr(); 186 } 187 188 /* Return false if user is listed in DenyUsers */ 189 if (options.num_deny_users > 0) { 190 for (i = 0; i < options.num_deny_users; i++) 191 if (match_user(pw->pw_name, hostname, ipaddr, 192 options.deny_users[i])) { 193 logit("User %.100s from %.100s not allowed " 194 "because listed in DenyUsers", 195 pw->pw_name, hostname); 196 return 0; 197 } 198 } 199 /* Return false if AllowUsers isn't empty and user isn't listed there */ 200 if (options.num_allow_users > 0) { 201 for (i = 0; i < options.num_allow_users; i++) 202 if (match_user(pw->pw_name, hostname, ipaddr, 203 options.allow_users[i])) 204 break; 205 /* i < options.num_allow_users iff we break for loop */ 206 if (i >= options.num_allow_users) { 207 logit("User %.100s from %.100s not allowed because " 208 "not listed in AllowUsers", pw->pw_name, hostname); 209 return 0; 210 } 211 } 212 if (options.num_deny_groups > 0 || options.num_allow_groups > 0) { 213 /* Get the user's group access list (primary and supplementary) */ 214 if (ga_init(pw->pw_name, pw->pw_gid) == 0) { 215 logit("User %.100s from %.100s not allowed because " 216 "not in any group", pw->pw_name, hostname); 217 return 0; 218 } 219 220 /* Return false if one of user's groups is listed in DenyGroups */ 221 if (options.num_deny_groups > 0) 222 if (ga_match(options.deny_groups, 223 options.num_deny_groups)) { 224 ga_free(); 225 logit("User %.100s from %.100s not allowed " 226 "because a group is listed in DenyGroups", 227 pw->pw_name, hostname); 228 return 0; 229 } 230 /* 231 * Return false if AllowGroups isn't empty and one of user's groups 232 * isn't listed there 233 */ 234 if (options.num_allow_groups > 0) 235 if (!ga_match(options.allow_groups, 236 options.num_allow_groups)) { 237 ga_free(); 238 logit("User %.100s from %.100s not allowed " 239 "because none of user's groups are listed " 240 "in AllowGroups", pw->pw_name, hostname); 241 return 0; 242 } 243 ga_free(); 244 } 245 246 #ifdef CUSTOM_SYS_AUTH_ALLOWED_USER 247 if (!sys_auth_allowed_user(pw, &loginmsg)) 248 return 0; 249 #endif 250 251 /* We found no reason not to let this user try to log on... */ 252 return 1; 253 } 254 255 void 256 auth_info(Authctxt *authctxt, const char *fmt, ...) 257 { 258 va_list ap; 259 int i; 260 261 free(authctxt->info); 262 authctxt->info = NULL; 263 264 va_start(ap, fmt); 265 i = vasprintf(&authctxt->info, fmt, ap); 266 va_end(ap); 267 268 if (i < 0 || authctxt->info == NULL) 269 fatal("vasprintf failed"); 270 } 271 272 void 273 auth_log(Authctxt *authctxt, int authenticated, int partial, 274 const char *method, const char *submethod) 275 { 276 void (*authlog) (const char *fmt,...) = verbose; 277 char *authmsg; 278 279 if (use_privsep && !mm_is_monitor() && !authctxt->postponed) 280 return; 281 282 /* Raise logging level */ 283 if (authenticated == 1 || 284 !authctxt->valid || 285 authctxt->failures >= options.max_authtries / 2 || 286 strcmp(method, "password") == 0) 287 authlog = logit; 288 289 if (authctxt->postponed) 290 authmsg = "Postponed"; 291 else if (partial) 292 authmsg = "Partial"; 293 else 294 authmsg = authenticated ? "Accepted" : "Failed"; 295 296 authlog("%s %s%s%s for %s%.100s from %.200s port %d %s%s%s", 297 authmsg, 298 method, 299 submethod != NULL ? "/" : "", submethod == NULL ? "" : submethod, 300 authctxt->valid ? "" : "invalid user ", 301 authctxt->user, 302 get_remote_ipaddr(), 303 get_remote_port(), 304 compat20 ? "ssh2" : "ssh1", 305 authctxt->info != NULL ? ": " : "", 306 authctxt->info != NULL ? authctxt->info : ""); 307 free(authctxt->info); 308 authctxt->info = NULL; 309 310 #ifdef CUSTOM_FAILED_LOGIN 311 if (authenticated == 0 && !authctxt->postponed && 312 (strcmp(method, "password") == 0 || 313 strncmp(method, "keyboard-interactive", 20) == 0 || 314 strcmp(method, "challenge-response") == 0)) 315 record_failed_login(authctxt->user, 316 get_canonical_hostname(options.use_dns), "ssh"); 317 # ifdef WITH_AIXAUTHENTICATE 318 if (authenticated) 319 sys_auth_record_login(authctxt->user, 320 get_canonical_hostname(options.use_dns), "ssh", &loginmsg); 321 # endif 322 #endif 323 #ifdef SSH_AUDIT_EVENTS 324 if (authenticated == 0 && !authctxt->postponed) 325 audit_event(audit_classify_auth(method)); 326 #endif 327 } 328 329 330 void 331 auth_maxtries_exceeded(Authctxt *authctxt) 332 { 333 packet_disconnect("Too many authentication failures for " 334 "%s%.100s from %.200s port %d %s", 335 authctxt->valid ? "" : "invalid user ", 336 authctxt->user, 337 get_remote_ipaddr(), 338 get_remote_port(), 339 compat20 ? "ssh2" : "ssh1"); 340 /* NOTREACHED */ 341 } 342 343 /* 344 * Check whether root logins are disallowed. 345 */ 346 int 347 auth_root_allowed(const char *method) 348 { 349 switch (options.permit_root_login) { 350 case PERMIT_YES: 351 return 1; 352 case PERMIT_NO_PASSWD: 353 if (strcmp(method, "password") != 0) 354 return 1; 355 break; 356 case PERMIT_FORCED_ONLY: 357 if (forced_command) { 358 logit("Root login accepted for forced command."); 359 return 1; 360 } 361 break; 362 } 363 logit("ROOT LOGIN REFUSED FROM %.200s", get_remote_ipaddr()); 364 return 0; 365 } 366 367 368 /* 369 * Given a template and a passwd structure, build a filename 370 * by substituting % tokenised options. Currently, %% becomes '%', 371 * %h becomes the home directory and %u the username. 372 * 373 * This returns a buffer allocated by xmalloc. 374 */ 375 char * 376 expand_authorized_keys(const char *filename, struct passwd *pw) 377 { 378 char *file, ret[MAXPATHLEN]; 379 int i; 380 381 file = percent_expand(filename, "h", pw->pw_dir, 382 "u", pw->pw_name, (char *)NULL); 383 384 /* 385 * Ensure that filename starts anchored. If not, be backward 386 * compatible and prepend the '%h/' 387 */ 388 if (*file == '/') 389 return (file); 390 391 i = snprintf(ret, sizeof(ret), "%s/%s", pw->pw_dir, file); 392 if (i < 0 || (size_t)i >= sizeof(ret)) 393 fatal("expand_authorized_keys: path too long"); 394 free(file); 395 return (xstrdup(ret)); 396 } 397 398 char * 399 authorized_principals_file(struct passwd *pw) 400 { 401 if (options.authorized_principals_file == NULL || 402 strcasecmp(options.authorized_principals_file, "none") == 0) 403 return NULL; 404 return expand_authorized_keys(options.authorized_principals_file, pw); 405 } 406 407 /* return ok if key exists in sysfile or userfile */ 408 HostStatus 409 check_key_in_hostfiles(struct passwd *pw, Key *key, const char *host, 410 const char *sysfile, const char *userfile) 411 { 412 char *user_hostfile; 413 struct stat st; 414 HostStatus host_status; 415 struct hostkeys *hostkeys; 416 const struct hostkey_entry *found; 417 418 hostkeys = init_hostkeys(); 419 load_hostkeys(hostkeys, host, sysfile); 420 if (userfile != NULL) { 421 user_hostfile = tilde_expand_filename(userfile, pw->pw_uid); 422 if (options.strict_modes && 423 (stat(user_hostfile, &st) == 0) && 424 ((st.st_uid != 0 && st.st_uid != pw->pw_uid) || 425 (st.st_mode & 022) != 0)) { 426 logit("Authentication refused for %.100s: " 427 "bad owner or modes for %.200s", 428 pw->pw_name, user_hostfile); 429 auth_debug_add("Ignored %.200s: bad ownership or modes", 430 user_hostfile); 431 } else { 432 temporarily_use_uid(pw); 433 load_hostkeys(hostkeys, host, user_hostfile); 434 restore_uid(); 435 } 436 free(user_hostfile); 437 } 438 host_status = check_key_in_hostkeys(hostkeys, key, &found); 439 if (host_status == HOST_REVOKED) 440 error("WARNING: revoked key for %s attempted authentication", 441 found->host); 442 else if (host_status == HOST_OK) 443 debug("%s: key for %s found at %s:%ld", __func__, 444 found->host, found->file, found->line); 445 else 446 debug("%s: key for host %s not found", __func__, host); 447 448 free_hostkeys(hostkeys); 449 450 return host_status; 451 } 452 453 /* 454 * Check a given path for security. This is defined as all components 455 * of the path to the file must be owned by either the owner of 456 * of the file or root and no directories must be group or world writable. 457 * 458 * XXX Should any specific check be done for sym links ? 459 * 460 * Takes a file name, its stat information (preferably from fstat() to 461 * avoid races), the uid of the expected owner, their home directory and an 462 * error buffer plus max size as arguments. 463 * 464 * Returns 0 on success and -1 on failure 465 */ 466 int 467 auth_secure_path(const char *name, struct stat *stp, const char *pw_dir, 468 uid_t uid, char *err, size_t errlen) 469 { 470 char buf[MAXPATHLEN], homedir[MAXPATHLEN]; 471 char *cp; 472 int comparehome = 0; 473 struct stat st; 474 475 if (realpath(name, buf) == NULL) { 476 snprintf(err, errlen, "realpath %s failed: %s", name, 477 strerror(errno)); 478 return -1; 479 } 480 if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL) 481 comparehome = 1; 482 483 if (!S_ISREG(stp->st_mode)) { 484 snprintf(err, errlen, "%s is not a regular file", buf); 485 return -1; 486 } 487 if ((!platform_sys_dir_uid(stp->st_uid) && stp->st_uid != uid) || 488 (stp->st_mode & 022) != 0) { 489 snprintf(err, errlen, "bad ownership or modes for file %s", 490 buf); 491 return -1; 492 } 493 494 /* for each component of the canonical path, walking upwards */ 495 for (;;) { 496 if ((cp = dirname(buf)) == NULL) { 497 snprintf(err, errlen, "dirname() failed"); 498 return -1; 499 } 500 strlcpy(buf, cp, sizeof(buf)); 501 502 if (stat(buf, &st) < 0 || 503 (!platform_sys_dir_uid(st.st_uid) && st.st_uid != uid) || 504 (st.st_mode & 022) != 0) { 505 snprintf(err, errlen, 506 "bad ownership or modes for directory %s", buf); 507 return -1; 508 } 509 510 /* If are past the homedir then we can stop */ 511 if (comparehome && strcmp(homedir, buf) == 0) 512 break; 513 514 /* 515 * dirname should always complete with a "/" path, 516 * but we can be paranoid and check for "." too 517 */ 518 if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0)) 519 break; 520 } 521 return 0; 522 } 523 524 /* 525 * Version of secure_path() that accepts an open file descriptor to 526 * avoid races. 527 * 528 * Returns 0 on success and -1 on failure 529 */ 530 static int 531 secure_filename(FILE *f, const char *file, struct passwd *pw, 532 char *err, size_t errlen) 533 { 534 struct stat st; 535 536 /* check the open file to avoid races */ 537 if (fstat(fileno(f), &st) < 0) { 538 snprintf(err, errlen, "cannot stat file %s: %s", 539 file, strerror(errno)); 540 return -1; 541 } 542 return auth_secure_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen); 543 } 544 545 static FILE * 546 auth_openfile(const char *file, struct passwd *pw, int strict_modes, 547 int log_missing, char *file_type) 548 { 549 char line[1024]; 550 struct stat st; 551 int fd; 552 FILE *f; 553 554 if ((fd = open(file, O_RDONLY|O_NONBLOCK)) == -1) { 555 if (log_missing || errno != ENOENT) 556 debug("Could not open %s '%s': %s", file_type, file, 557 strerror(errno)); 558 return NULL; 559 } 560 561 if (fstat(fd, &st) < 0) { 562 close(fd); 563 return NULL; 564 } 565 if (!S_ISREG(st.st_mode)) { 566 logit("User %s %s %s is not a regular file", 567 pw->pw_name, file_type, file); 568 close(fd); 569 return NULL; 570 } 571 unset_nonblock(fd); 572 if ((f = fdopen(fd, "r")) == NULL) { 573 close(fd); 574 return NULL; 575 } 576 if (strict_modes && 577 secure_filename(f, file, pw, line, sizeof(line)) != 0) { 578 fclose(f); 579 logit("Authentication refused: %s", line); 580 auth_debug_add("Ignored %s: %s", file_type, line); 581 return NULL; 582 } 583 584 return f; 585 } 586 587 588 FILE * 589 auth_openkeyfile(const char *file, struct passwd *pw, int strict_modes) 590 { 591 return auth_openfile(file, pw, strict_modes, 1, "authorized keys"); 592 } 593 594 FILE * 595 auth_openprincipals(const char *file, struct passwd *pw, int strict_modes) 596 { 597 return auth_openfile(file, pw, strict_modes, 0, 598 "authorized principals"); 599 } 600 601 struct passwd * 602 getpwnamallow(const char *user) 603 { 604 #ifdef HAVE_LOGIN_CAP 605 extern login_cap_t *lc; 606 #ifdef BSD_AUTH 607 auth_session_t *as; 608 #endif 609 #endif 610 struct passwd *pw; 611 struct connection_info *ci = get_connection_info(1, options.use_dns); 612 613 ci->user = user; 614 parse_server_match_config(&options, ci); 615 616 #if defined(_AIX) && defined(HAVE_SETAUTHDB) 617 aix_setauthdb(user); 618 #endif 619 620 pw = getpwnam(user); 621 622 #if defined(_AIX) && defined(HAVE_SETAUTHDB) 623 aix_restoreauthdb(); 624 #endif 625 #ifdef HAVE_CYGWIN 626 /* 627 * Windows usernames are case-insensitive. To avoid later problems 628 * when trying to match the username, the user is only allowed to 629 * login if the username is given in the same case as stored in the 630 * user database. 631 */ 632 if (pw != NULL && strcmp(user, pw->pw_name) != 0) { 633 logit("Login name %.100s does not match stored username %.100s", 634 user, pw->pw_name); 635 pw = NULL; 636 } 637 #endif 638 if (pw == NULL) { 639 logit("Invalid user %.100s from %.100s", 640 user, get_remote_ipaddr()); 641 #ifdef CUSTOM_FAILED_LOGIN 642 record_failed_login(user, 643 get_canonical_hostname(options.use_dns), "ssh"); 644 #endif 645 #ifdef SSH_AUDIT_EVENTS 646 audit_event(SSH_INVALID_USER); 647 #endif /* SSH_AUDIT_EVENTS */ 648 return (NULL); 649 } 650 if (!allowed_user(pw)) 651 return (NULL); 652 #ifdef HAVE_LOGIN_CAP 653 if ((lc = login_getclass(pw->pw_class)) == NULL) { 654 debug("unable to get login class: %s", user); 655 return (NULL); 656 } 657 #ifdef BSD_AUTH 658 if ((as = auth_open()) == NULL || auth_setpwd(as, pw) != 0 || 659 auth_approval(as, lc, pw->pw_name, "ssh") <= 0) { 660 debug("Approval failure for %s", user); 661 pw = NULL; 662 } 663 if (as != NULL) 664 auth_close(as); 665 #endif 666 #endif 667 if (pw != NULL) 668 return (pwcopy(pw)); 669 return (NULL); 670 } 671 672 /* Returns 1 if key is revoked by revoked_keys_file, 0 otherwise */ 673 int 674 auth_key_is_revoked(Key *key) 675 { 676 #ifdef WITH_OPENSSL 677 char *key_fp; 678 679 if (options.revoked_keys_file == NULL) 680 return 0; 681 switch (ssh_krl_file_contains_key(options.revoked_keys_file, key)) { 682 case 0: 683 return 0; /* Not revoked */ 684 case -2: 685 break; /* Not a KRL */ 686 default: 687 goto revoked; 688 } 689 #endif 690 debug3("%s: treating %s as a key list", __func__, 691 options.revoked_keys_file); 692 switch (key_in_file(key, options.revoked_keys_file, 0)) { 693 case 0: 694 /* key not revoked */ 695 return 0; 696 case -1: 697 /* Error opening revoked_keys_file: refuse all keys */ 698 error("Revoked keys file is unreadable: refusing public key " 699 "authentication"); 700 return 1; 701 #ifdef WITH_OPENSSL 702 case 1: 703 revoked: 704 /* Key revoked */ 705 key_fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); 706 error("WARNING: authentication attempt with a revoked " 707 "%s key %s ", key_type(key), key_fp); 708 free(key_fp); 709 return 1; 710 #endif 711 } 712 fatal("key_in_file returned junk"); 713 } 714 715 void 716 auth_debug_add(const char *fmt,...) 717 { 718 char buf[1024]; 719 va_list args; 720 721 if (!auth_debug_init) 722 return; 723 724 va_start(args, fmt); 725 vsnprintf(buf, sizeof(buf), fmt, args); 726 va_end(args); 727 buffer_put_cstring(&auth_debug, buf); 728 } 729 730 void 731 auth_debug_send(void) 732 { 733 char *msg; 734 735 if (!auth_debug_init) 736 return; 737 while (buffer_len(&auth_debug)) { 738 msg = buffer_get_string(&auth_debug, NULL); 739 packet_send_debug("%s", msg); 740 free(msg); 741 } 742 } 743 744 void 745 auth_debug_reset(void) 746 { 747 if (auth_debug_init) 748 buffer_clear(&auth_debug); 749 else { 750 buffer_init(&auth_debug); 751 auth_debug_init = 1; 752 } 753 } 754 755 struct passwd * 756 fakepw(void) 757 { 758 static struct passwd fake; 759 760 memset(&fake, 0, sizeof(fake)); 761 fake.pw_name = "NOUSER"; 762 fake.pw_passwd = 763 "$2a$06$r3.juUaHZDlIbQaO2dS9FuYxL1W9M81R1Tc92PoSNmzvpEqLkLGrK"; 764 #ifdef HAVE_STRUCT_PASSWD_PW_GECOS 765 fake.pw_gecos = "NOUSER"; 766 #endif 767 fake.pw_uid = privsep_pw == NULL ? (uid_t)-1 : privsep_pw->pw_uid; 768 fake.pw_gid = privsep_pw == NULL ? (gid_t)-1 : privsep_pw->pw_gid; 769 #ifdef HAVE_STRUCT_PASSWD_PW_CLASS 770 fake.pw_class = ""; 771 #endif 772 fake.pw_dir = "/nonexist"; 773 fake.pw_shell = "/nonexist"; 774 775 return (&fake); 776 } 777