1 /* $NetBSD: auth.c,v 1.15 2015/08/21 08:20:59 christos Exp $ */ 2 /* $OpenBSD: auth.c,v 1.113 2015/08/21 03:42:19 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: auth.c,v 1.15 2015/08/21 08:20:59 christos Exp $"); 29 #include <sys/types.h> 30 #include <sys/stat.h> 31 32 #include <errno.h> 33 #include <fcntl.h> 34 #include <libgen.h> 35 #include <login_cap.h> 36 #include <paths.h> 37 #include <pwd.h> 38 #include <stdarg.h> 39 #include <stdio.h> 40 #include <string.h> 41 #include <unistd.h> 42 #include <limits.h> 43 44 #include "xmalloc.h" 45 #include "match.h" 46 #include "groupaccess.h" 47 #include "log.h" 48 #include "buffer.h" 49 #include "misc.h" 50 #include "servconf.h" 51 #include "key.h" 52 #include "hostfile.h" 53 #include "auth.h" 54 #include "auth-options.h" 55 #include "canohost.h" 56 #include "uidswap.h" 57 #include "packet.h" 58 #ifdef GSSAPI 59 #include "ssh-gss.h" 60 #endif 61 #include "authfile.h" 62 #include "monitor_wrap.h" 63 #include "authfile.h" 64 #include "ssherr.h" 65 #include "compat.h" 66 #include "pfilter.h" 67 68 #ifdef HAVE_LOGIN_CAP 69 #include <login_cap.h> 70 #endif 71 72 /* import */ 73 extern ServerOptions options; 74 extern int use_privsep; 75 76 /* Debugging messages */ 77 Buffer auth_debug; 78 int auth_debug_init; 79 80 /* 81 * Check if the user is allowed to log in via ssh. If user is listed 82 * in DenyUsers or one of user's groups is listed in DenyGroups, false 83 * will be returned. If AllowUsers isn't empty and user isn't listed 84 * there, or if AllowGroups isn't empty and one of user's groups isn't 85 * listed there, false will be returned. 86 * If the user's shell is not executable, false will be returned. 87 * Otherwise true is returned. 88 */ 89 int 90 allowed_user(struct passwd * pw) 91 { 92 #ifdef HAVE_LOGIN_CAP 93 extern login_cap_t *lc; 94 int match_name, match_ip; 95 char *cap_hlist, *hp; 96 #endif 97 struct stat st; 98 const char *hostname = NULL, *ipaddr = NULL; 99 u_int i; 100 101 /* Shouldn't be called if pw is NULL, but better safe than sorry... */ 102 if (!pw || !pw->pw_name) 103 return 0; 104 105 #ifdef HAVE_LOGIN_CAP 106 hostname = get_canonical_hostname(options.use_dns); 107 ipaddr = get_remote_ipaddr(); 108 109 lc = login_getclass(pw->pw_class); 110 111 /* 112 * Check the deny list. 113 */ 114 cap_hlist = login_getcapstr(lc, "host.deny", NULL, NULL); 115 if (cap_hlist != NULL) { 116 hp = strtok(cap_hlist, ","); 117 while (hp != NULL) { 118 match_name = match_hostname(hostname, hp); 119 match_ip = match_hostname(ipaddr, hp); 120 /* 121 * Only a positive match here causes a "deny". 122 */ 123 if (match_name > 0 || match_ip > 0) { 124 free(cap_hlist); 125 login_close(lc); 126 return 0; 127 } 128 hp = strtok(NULL, ","); 129 } 130 free(cap_hlist); 131 } 132 133 /* 134 * Check the allow list. If the allow list exists, and the 135 * remote host is not in it, the user is implicitly denied. 136 */ 137 cap_hlist = login_getcapstr(lc, "host.allow", NULL, NULL); 138 if (cap_hlist != NULL) { 139 hp = strtok(cap_hlist, ","); 140 if (hp == NULL) { 141 /* Just in case there's an empty string... */ 142 free(cap_hlist); 143 login_close(lc); 144 return 0; 145 } 146 while (hp != NULL) { 147 match_name = match_hostname(hostname, hp); 148 match_ip = match_hostname(ipaddr, hp); 149 /* 150 * Negative match causes an immediate "deny". 151 * Positive match causes us to break out 152 * of the loop (allowing a fallthrough). 153 */ 154 if (match_name < 0 || match_ip < 0) { 155 free(cap_hlist); 156 login_close(lc); 157 return 0; 158 } 159 if (match_name > 0 || match_ip > 0) 160 break; 161 hp = strtok(NULL, ","); 162 } 163 free(cap_hlist); 164 if (hp == NULL) { 165 login_close(lc); 166 return 0; 167 } 168 } 169 170 login_close(lc); 171 #endif 172 173 #ifdef USE_PAM 174 if (!options.use_pam) { 175 #endif 176 /* 177 * password/account expiration. 178 */ 179 if (pw->pw_change || pw->pw_expire) { 180 struct timeval tv; 181 182 (void)gettimeofday(&tv, (struct timezone *)NULL); 183 if (pw->pw_expire) { 184 if (tv.tv_sec >= pw->pw_expire) { 185 logit("User %.100s not allowed because account has expired", 186 pw->pw_name); 187 return 0; /* expired */ 188 } 189 } 190 #ifdef _PASSWORD_CHGNOW 191 if (pw->pw_change == _PASSWORD_CHGNOW) { 192 logit("User %.100s not allowed because password needs to be changed", 193 pw->pw_name); 194 195 return 0; /* can't force password change (yet) */ 196 } 197 #endif 198 if (pw->pw_change) { 199 if (tv.tv_sec >= pw->pw_change) { 200 logit("User %.100s not allowed because password has expired", 201 pw->pw_name); 202 return 0; /* expired */ 203 } 204 } 205 } 206 #ifdef USE_PAM 207 } 208 #endif 209 210 /* 211 * Deny if shell does not exist or is not executable unless we 212 * are chrooting. 213 */ 214 /* 215 * XXX Should check to see if it is executable by the 216 * XXX requesting user. --thorpej 217 */ 218 if (options.chroot_directory == NULL || 219 strcasecmp(options.chroot_directory, "none") == 0) { 220 char *shell = xstrdup((pw->pw_shell[0] == '\0') ? 221 _PATH_BSHELL : pw->pw_shell); /* empty = /bin/sh */ 222 223 if (stat(shell, &st) != 0) { 224 logit("User %.100s not allowed because shell %.100s " 225 "does not exist", pw->pw_name, shell); 226 free(shell); 227 return 0; 228 } 229 if (S_ISREG(st.st_mode) == 0 || 230 (st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP)) == 0) { 231 logit("User %.100s not allowed because shell %.100s " 232 "is not executable", pw->pw_name, shell); 233 free(shell); 234 return 0; 235 } 236 free(shell); 237 } 238 /* 239 * XXX Consider nuking {Allow,Deny}{Users,Groups}. We have the 240 * XXX login_cap(3) mechanism which covers all other types of 241 * XXX logins, too. 242 */ 243 244 if (options.num_deny_users > 0 || options.num_allow_users > 0 || 245 options.num_deny_groups > 0 || options.num_allow_groups > 0) { 246 hostname = get_canonical_hostname(options.use_dns); 247 ipaddr = get_remote_ipaddr(); 248 } 249 250 /* Return false if user is listed in DenyUsers */ 251 if (options.num_deny_users > 0) { 252 for (i = 0; i < options.num_deny_users; i++) 253 if (match_user(pw->pw_name, hostname, ipaddr, 254 options.deny_users[i])) { 255 logit("User %.100s from %.100s not allowed " 256 "because listed in DenyUsers", 257 pw->pw_name, hostname); 258 return 0; 259 } 260 } 261 /* Return false if AllowUsers isn't empty and user isn't listed there */ 262 if (options.num_allow_users > 0) { 263 for (i = 0; i < options.num_allow_users; i++) 264 if (match_user(pw->pw_name, hostname, ipaddr, 265 options.allow_users[i])) 266 break; 267 /* i < options.num_allow_users iff we break for loop */ 268 if (i >= options.num_allow_users) { 269 logit("User %.100s from %.100s not allowed because " 270 "not listed in AllowUsers", pw->pw_name, hostname); 271 return 0; 272 } 273 } 274 if (options.num_deny_groups > 0 || options.num_allow_groups > 0) { 275 /* Get the user's group access list (primary and supplementary) */ 276 if (ga_init(pw->pw_name, pw->pw_gid) == 0) { 277 logit("User %.100s from %.100s not allowed because " 278 "not in any group", pw->pw_name, hostname); 279 return 0; 280 } 281 282 /* Return false if one of user's groups is listed in DenyGroups */ 283 if (options.num_deny_groups > 0) 284 if (ga_match(options.deny_groups, 285 options.num_deny_groups)) { 286 ga_free(); 287 logit("User %.100s from %.100s not allowed " 288 "because a group is listed in DenyGroups", 289 pw->pw_name, hostname); 290 return 0; 291 } 292 /* 293 * Return false if AllowGroups isn't empty and one of user's groups 294 * isn't listed there 295 */ 296 if (options.num_allow_groups > 0) 297 if (!ga_match(options.allow_groups, 298 options.num_allow_groups)) { 299 ga_free(); 300 logit("User %.100s from %.100s not allowed " 301 "because none of user's groups are listed " 302 "in AllowGroups", pw->pw_name, hostname); 303 return 0; 304 } 305 ga_free(); 306 } 307 /* We found no reason not to let this user try to log on... */ 308 return 1; 309 } 310 311 void 312 auth_info(Authctxt *authctxt, const char *fmt, ...) 313 { 314 va_list ap; 315 int i; 316 317 free(authctxt->info); 318 authctxt->info = NULL; 319 320 va_start(ap, fmt); 321 i = vasprintf(&authctxt->info, fmt, ap); 322 va_end(ap); 323 324 if (i < 0 || authctxt->info == NULL) 325 fatal("vasprintf failed"); 326 } 327 328 void 329 auth_log(Authctxt *authctxt, int authenticated, int partial, 330 const char *method, const char *submethod) 331 { 332 void (*authlog) (const char *fmt,...) = verbose; 333 const char *authmsg; 334 335 if (use_privsep && !mm_is_monitor() && !authctxt->postponed) 336 return; 337 338 /* Raise logging level */ 339 if (authenticated == 1 || 340 !authctxt->valid || 341 authctxt->failures >= options.max_authtries / 2 || 342 strcmp(method, "password") == 0) 343 authlog = logit; 344 345 if (authctxt->postponed) 346 authmsg = "Postponed"; 347 else if (partial) 348 authmsg = "Partial"; 349 else 350 authmsg = authenticated ? "Accepted" : "Failed"; 351 352 authlog("%s %s%s%s for %s%.100s from %.200s port %d %s%s%s", 353 authmsg, 354 method, 355 submethod != NULL ? "/" : "", submethod == NULL ? "" : submethod, 356 authctxt->valid ? "" : "invalid user ", 357 authctxt->user, 358 get_remote_ipaddr(), 359 get_remote_port(), 360 compat20 ? "ssh2" : "ssh1", 361 authctxt->info != NULL ? ": " : "", 362 authctxt->info != NULL ? authctxt->info : ""); 363 if (!authctxt->postponed) 364 pfilter_notify(!authenticated); 365 free(authctxt->info); 366 authctxt->info = NULL; 367 } 368 369 void 370 auth_maxtries_exceeded(Authctxt *authctxt) 371 { 372 error("maximum authentication attempts exceeded for " 373 "%s%.100s from %.200s port %d %s", 374 authctxt->valid ? "" : "invalid user ", 375 authctxt->user, 376 get_remote_ipaddr(), 377 get_remote_port(), 378 compat20 ? "ssh2" : "ssh1"); 379 packet_disconnect("Too many authentication failures"); 380 /* NOTREACHED */ 381 } 382 383 /* 384 * Check whether root logins are disallowed. 385 */ 386 int 387 auth_root_allowed(const char *method) 388 { 389 switch (options.permit_root_login) { 390 case PERMIT_YES: 391 return 1; 392 case PERMIT_NO_PASSWD: 393 if (strcmp(method, "publickey") == 0 || 394 strcmp(method, "hostbased") == 0 || 395 strcmp(method, "gssapi-with-mic") == 0) 396 return 1; 397 break; 398 case PERMIT_FORCED_ONLY: 399 if (forced_command) { 400 logit("Root login accepted for forced command."); 401 return 1; 402 } 403 break; 404 } 405 logit("ROOT LOGIN REFUSED FROM %.200s", get_remote_ipaddr()); 406 return 0; 407 } 408 409 410 /* 411 * Given a template and a passwd structure, build a filename 412 * by substituting % tokenised options. Currently, %% becomes '%', 413 * %h becomes the home directory and %u the username. 414 * 415 * This returns a buffer allocated by xmalloc. 416 */ 417 char * 418 expand_authorized_keys(const char *filename, struct passwd *pw) 419 { 420 char *file, ret[PATH_MAX]; 421 int i; 422 423 file = percent_expand(filename, "h", pw->pw_dir, 424 "u", pw->pw_name, (char *)NULL); 425 426 /* 427 * Ensure that filename starts anchored. If not, be backward 428 * compatible and prepend the '%h/' 429 */ 430 if (*file == '/') 431 return (file); 432 433 i = snprintf(ret, sizeof(ret), "%s/%s", pw->pw_dir, file); 434 if (i < 0 || (size_t)i >= sizeof(ret)) 435 fatal("expand_authorized_keys: path too long"); 436 free(file); 437 return (xstrdup(ret)); 438 } 439 440 char * 441 authorized_principals_file(struct passwd *pw) 442 { 443 if (options.authorized_principals_file == NULL) 444 return NULL; 445 return expand_authorized_keys(options.authorized_principals_file, pw); 446 } 447 448 /* return ok if key exists in sysfile or userfile */ 449 HostStatus 450 check_key_in_hostfiles(struct passwd *pw, Key *key, const char *host, 451 const char *sysfile, const char *userfile) 452 { 453 char *user_hostfile; 454 struct stat st; 455 HostStatus host_status; 456 struct hostkeys *hostkeys; 457 const struct hostkey_entry *found; 458 459 hostkeys = init_hostkeys(); 460 load_hostkeys(hostkeys, host, sysfile); 461 if (userfile != NULL) { 462 user_hostfile = tilde_expand_filename(userfile, pw->pw_uid); 463 if (options.strict_modes && 464 (stat(user_hostfile, &st) == 0) && 465 ((st.st_uid != 0 && st.st_uid != pw->pw_uid) || 466 (st.st_mode & 022) != 0)) { 467 logit("Authentication refused for %.100s: " 468 "bad owner or modes for %.200s", 469 pw->pw_name, user_hostfile); 470 auth_debug_add("Ignored %.200s: bad ownership or modes", 471 user_hostfile); 472 } else { 473 temporarily_use_uid(pw); 474 load_hostkeys(hostkeys, host, user_hostfile); 475 restore_uid(); 476 } 477 free(user_hostfile); 478 } 479 host_status = check_key_in_hostkeys(hostkeys, key, &found); 480 if (host_status == HOST_REVOKED) 481 error("WARNING: revoked key for %s attempted authentication", 482 found->host); 483 else if (host_status == HOST_OK) 484 debug("%s: key for %s found at %s:%ld", __func__, 485 found->host, found->file, found->line); 486 else 487 debug("%s: key for host %s not found", __func__, host); 488 489 free_hostkeys(hostkeys); 490 491 return host_status; 492 } 493 494 /* 495 * Check a given path for security. This is defined as all components 496 * of the path to the file must be owned by either the owner of 497 * of the file or root and no directories must be group or world writable. 498 * 499 * XXX Should any specific check be done for sym links ? 500 * 501 * Takes a file name, its stat information (preferably from fstat() to 502 * avoid races), the uid of the expected owner, their home directory and an 503 * error buffer plus max size as arguments. 504 * 505 * Returns 0 on success and -1 on failure 506 */ 507 int 508 auth_secure_path(const char *name, struct stat *stp, const char *pw_dir, 509 uid_t uid, char *err, size_t errlen) 510 { 511 char buf[PATH_MAX], homedir[PATH_MAX]; 512 char *cp; 513 int comparehome = 0; 514 struct stat st; 515 516 if (realpath(name, buf) == NULL) { 517 snprintf(err, errlen, "realpath %s failed: %s", name, 518 strerror(errno)); 519 return -1; 520 } 521 if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL) 522 comparehome = 1; 523 524 if (!S_ISREG(stp->st_mode)) { 525 snprintf(err, errlen, "%s is not a regular file", buf); 526 return -1; 527 } 528 if ((stp->st_uid != 0 && stp->st_uid != uid) || 529 (stp->st_mode & 022) != 0) { 530 snprintf(err, errlen, "bad ownership or modes for file %s", 531 buf); 532 return -1; 533 } 534 535 /* for each component of the canonical path, walking upwards */ 536 for (;;) { 537 if ((cp = dirname(buf)) == NULL) { 538 snprintf(err, errlen, "dirname() failed"); 539 return -1; 540 } 541 strlcpy(buf, cp, sizeof(buf)); 542 543 if (stat(buf, &st) < 0 || 544 (st.st_uid != 0 && st.st_uid != uid) || 545 (st.st_mode & 022) != 0) { 546 snprintf(err, errlen, 547 "bad ownership or modes for directory %s", buf); 548 return -1; 549 } 550 551 /* If are past the homedir then we can stop */ 552 if (comparehome && strcmp(homedir, buf) == 0) 553 break; 554 555 /* 556 * dirname should always complete with a "/" path, 557 * but we can be paranoid and check for "." too 558 */ 559 if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0)) 560 break; 561 } 562 return 0; 563 } 564 565 /* 566 * Version of secure_path() that accepts an open file descriptor to 567 * avoid races. 568 * 569 * Returns 0 on success and -1 on failure 570 */ 571 static int 572 secure_filename(FILE *f, const char *file, struct passwd *pw, 573 char *err, size_t errlen) 574 { 575 struct stat st; 576 577 /* check the open file to avoid races */ 578 if (fstat(fileno(f), &st) < 0) { 579 snprintf(err, errlen, "cannot stat file %s: %s", 580 file, strerror(errno)); 581 return -1; 582 } 583 return auth_secure_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen); 584 } 585 586 static FILE * 587 auth_openfile(const char *file, struct passwd *pw, int strict_modes, 588 int log_missing, const char *file_type) 589 { 590 char line[1024]; 591 struct stat st; 592 int fd; 593 FILE *f; 594 595 if ((fd = open(file, O_RDONLY|O_NONBLOCK)) == -1) { 596 if (log_missing || errno != ENOENT) 597 debug("Could not open %s '%s': %s", file_type, file, 598 strerror(errno)); 599 return NULL; 600 } 601 602 if (fstat(fd, &st) < 0) { 603 close(fd); 604 return NULL; 605 } 606 if (!S_ISREG(st.st_mode)) { 607 logit("User %s %s %s is not a regular file", 608 pw->pw_name, file_type, file); 609 close(fd); 610 return NULL; 611 } 612 unset_nonblock(fd); 613 if ((f = fdopen(fd, "r")) == NULL) { 614 close(fd); 615 return NULL; 616 } 617 if (strict_modes && 618 secure_filename(f, file, pw, line, sizeof(line)) != 0) { 619 fclose(f); 620 logit("Authentication refused: %s", line); 621 auth_debug_add("Ignored %s: %s", file_type, line); 622 return NULL; 623 } 624 625 return f; 626 } 627 628 629 FILE * 630 auth_openkeyfile(const char *file, struct passwd *pw, int strict_modes) 631 { 632 return auth_openfile(file, pw, strict_modes, 1, "authorized keys"); 633 } 634 635 FILE * 636 auth_openprincipals(const char *file, struct passwd *pw, int strict_modes) 637 { 638 return auth_openfile(file, pw, strict_modes, 0, 639 "authorized principals"); 640 } 641 642 struct passwd * 643 getpwnamallow(const char *user) 644 { 645 #ifdef HAVE_LOGIN_CAP 646 extern login_cap_t *lc; 647 #ifdef BSD_AUTH 648 auth_session_t *as; 649 #endif 650 #endif 651 struct passwd *pw; 652 struct connection_info *ci = get_connection_info(1, options.use_dns); 653 654 ci->user = user; 655 parse_server_match_config(&options, ci); 656 657 pw = getpwnam(user); 658 if (pw == NULL) { 659 logit("Invalid user %.100s from %.100s", 660 user, get_remote_ipaddr()); 661 return (NULL); 662 } 663 if (!allowed_user(pw)) 664 return (NULL); 665 #ifdef HAVE_LOGIN_CAP 666 if ((lc = login_getclass(pw->pw_class)) == NULL) { 667 debug("unable to get login class: %s", user); 668 return (NULL); 669 } 670 #ifdef BSD_AUTH 671 if ((as = auth_open()) == NULL || auth_setpwd(as, pw) != 0 || 672 auth_approval(as, lc, pw->pw_name, "ssh") <= 0) { 673 debug("Approval failure for %s", user); 674 pw = NULL; 675 } 676 if (as != NULL) 677 auth_close(as); 678 #endif 679 #endif 680 if (pw != NULL) 681 return (pwcopy(pw)); 682 return (NULL); 683 } 684 685 /* Returns 1 if key is revoked by revoked_keys_file, 0 otherwise */ 686 int 687 auth_key_is_revoked(Key *key) 688 { 689 char *fp = NULL; 690 int r; 691 692 if (options.revoked_keys_file == NULL) 693 return 0; 694 if ((fp = sshkey_fingerprint(key, options.fingerprint_hash, 695 SSH_FP_DEFAULT)) == NULL) { 696 r = SSH_ERR_ALLOC_FAIL; 697 error("%s: fingerprint key: %s", __func__, ssh_err(r)); 698 goto out; 699 } 700 701 r = sshkey_check_revoked(key, options.revoked_keys_file); 702 switch (r) { 703 case 0: 704 break; /* not revoked */ 705 case SSH_ERR_KEY_REVOKED: 706 error("Authentication key %s %s revoked by file %s", 707 sshkey_type(key), fp, options.revoked_keys_file); 708 goto out; 709 default: 710 error("Error checking authentication key %s %s in " 711 "revoked keys file %s: %s", sshkey_type(key), fp, 712 options.revoked_keys_file, ssh_err(r)); 713 goto out; 714 } 715 716 /* Success */ 717 r = 0; 718 719 out: 720 free(fp); 721 return r == 0 ? 0 : 1; 722 } 723 724 void 725 auth_debug_add(const char *fmt,...) 726 { 727 char buf[1024]; 728 va_list args; 729 730 if (!auth_debug_init) 731 return; 732 733 va_start(args, fmt); 734 vsnprintf(buf, sizeof(buf), fmt, args); 735 va_end(args); 736 buffer_put_cstring(&auth_debug, buf); 737 } 738 739 void 740 auth_debug_send(void) 741 { 742 char *msg; 743 744 if (!auth_debug_init) 745 return; 746 while (buffer_len(&auth_debug)) { 747 msg = buffer_get_string(&auth_debug, NULL); 748 packet_send_debug("%s", msg); 749 free(msg); 750 } 751 } 752 753 void 754 auth_debug_reset(void) 755 { 756 if (auth_debug_init) 757 buffer_clear(&auth_debug); 758 else { 759 buffer_init(&auth_debug); 760 auth_debug_init = 1; 761 } 762 } 763 764 struct passwd * 765 fakepw(void) 766 { 767 static struct passwd fake; 768 static char nouser[] = "NOUSER"; 769 static char nonexist[] = "/nonexist"; 770 771 memset(&fake, 0, sizeof(fake)); 772 fake.pw_name = nouser; 773 fake.pw_passwd = __UNCONST( 774 "$2a$06$r3.juUaHZDlIbQaO2dS9FuYxL1W9M81R1Tc92PoSNmzvpEqLkLGrK"); 775 fake.pw_gecos = nouser; 776 fake.pw_uid = (uid_t)-1; 777 fake.pw_gid = (gid_t)-1; 778 fake.pw_class = __UNCONST(""); 779 fake.pw_dir = nonexist; 780 fake.pw_shell = nonexist; 781 782 return (&fake); 783 } 784