1/* $OpenBSD: auth.c,v 1.101 2013/02/06 00:22:21 dtucker 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 "servconf.h" 60#include "key.h" 61#include "hostfile.h" 62#include "auth.h" 63#include "auth-options.h" 64#include "canohost.h" 65#include "uidswap.h" 66#include "misc.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 76/* import */ 77extern ServerOptions options; 78extern int use_privsep; 79extern Buffer loginmsg; 80extern struct passwd *privsep_pw; 81 82/* Debugging messages */ 83Buffer auth_debug; 84int auth_debug_init; 85 86/* 87 * Check if the user is allowed to log in via ssh. If user is listed 88 * in DenyUsers or one of user's groups is listed in DenyGroups, false 89 * will be returned. If AllowUsers isn't empty and user isn't listed 90 * there, or if AllowGroups isn't empty and one of user's groups isn't 91 * listed there, false will be returned. 92 * If the user's shell is not executable, false will be returned. 93 * Otherwise true is returned. 94 */ 95int 96allowed_user(struct passwd * pw) 97{ 98 struct stat st; 99 const char *hostname = NULL, *ipaddr = NULL, *passwd = NULL; 100 u_int i; 101#ifdef USE_SHADOW 102 struct spwd *spw = NULL; 103#endif 104 105 /* Shouldn't be called if pw is NULL, but better safe than sorry... */ 106 if (!pw || !pw->pw_name) 107 return 0; 108 109#ifdef USE_SHADOW 110 if (!options.use_pam) 111 spw = getspnam(pw->pw_name); 112#ifdef HAS_SHADOW_EXPIRE 113 if (!options.use_pam && spw != NULL && auth_shadow_acctexpired(spw)) 114 return 0; 115#endif /* HAS_SHADOW_EXPIRE */ 116#endif /* USE_SHADOW */ 117 118 /* grab passwd field for locked account check */ 119 passwd = pw->pw_passwd; 120#ifdef USE_SHADOW 121 if (spw != NULL) 122#ifdef USE_LIBIAF 123 passwd = get_iaf_password(pw); 124#else 125 passwd = spw->sp_pwdp; 126#endif /* USE_LIBIAF */ 127#endif 128 129 /* check for locked account */ 130 if (!options.use_pam && passwd && *passwd) { 131 int locked = 0; 132 133#ifdef LOCKED_PASSWD_STRING 134 if (strcmp(passwd, LOCKED_PASSWD_STRING) == 0) 135 locked = 1; 136#endif 137#ifdef LOCKED_PASSWD_PREFIX 138 if (strncmp(passwd, LOCKED_PASSWD_PREFIX, 139 strlen(LOCKED_PASSWD_PREFIX)) == 0) 140 locked = 1; 141#endif 142#ifdef LOCKED_PASSWD_SUBSTR 143 if (strstr(passwd, LOCKED_PASSWD_SUBSTR)) 144 locked = 1; 145#endif 146#ifdef USE_LIBIAF 147 free((void *) passwd); 148#endif /* USE_LIBIAF */ 149 if (locked) { 150 logit("User %.100s not allowed because account is locked", 151 pw->pw_name); 152 return 0; 153 } 154 } 155 156 /* 157 * Deny if shell does not exist or is not executable unless we 158 * are chrooting. 159 */ 160 if (options.chroot_directory == NULL || 161 strcasecmp(options.chroot_directory, "none") == 0) { 162 char *shell = xstrdup((pw->pw_shell[0] == '\0') ? 163 _PATH_BSHELL : pw->pw_shell); /* empty = /bin/sh */ 164 165 if (stat(shell, &st) != 0) { 166 logit("User %.100s not allowed because shell %.100s " 167 "does not exist", pw->pw_name, shell); 168 xfree(shell); 169 return 0; 170 } 171 if (S_ISREG(st.st_mode) == 0 || 172 (st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP)) == 0) { 173 logit("User %.100s not allowed because shell %.100s " 174 "is not executable", pw->pw_name, shell); 175 xfree(shell); 176 return 0; 177 } 178 xfree(shell); 179 } 180 181 if (options.num_deny_users > 0 || options.num_allow_users > 0 || 182 options.num_deny_groups > 0 || options.num_allow_groups > 0) { 183 hostname = get_canonical_hostname(options.use_dns); 184 ipaddr = get_remote_ipaddr(); 185 } 186 187 /* Return false if user is listed in DenyUsers */ 188 if (options.num_deny_users > 0) { 189 for (i = 0; i < options.num_deny_users; i++) 190 if (match_user(pw->pw_name, hostname, ipaddr, 191 options.deny_users[i])) { 192 logit("User %.100s from %.100s not allowed " 193 "because listed in DenyUsers", 194 pw->pw_name, hostname); 195 return 0; 196 } 197 } 198 /* Return false if AllowUsers isn't empty and user isn't listed there */ 199 if (options.num_allow_users > 0) { 200 for (i = 0; i < options.num_allow_users; i++) 201 if (match_user(pw->pw_name, hostname, ipaddr, 202 options.allow_users[i])) 203 break; 204 /* i < options.num_allow_users iff we break for loop */ 205 if (i >= options.num_allow_users) { 206 logit("User %.100s from %.100s not allowed because " 207 "not listed in AllowUsers", pw->pw_name, hostname); 208 return 0; 209 } 210 } 211 if (options.num_deny_groups > 0 || options.num_allow_groups > 0) { 212 /* Get the user's group access list (primary and supplementary) */ 213 if (ga_init(pw) == 0) { 214 logit("User %.100s from %.100s not allowed because " 215 "not in any group", pw->pw_name, hostname); 216 return 0; 217 } 218 219 /* Return false if one of user's groups is listed in DenyGroups */ 220 if (options.num_deny_groups > 0) 221 if (ga_match(options.deny_groups, 222 options.num_deny_groups)) { 223 ga_free(); 224 logit("User %.100s from %.100s not allowed " 225 "because a group is listed in DenyGroups", 226 pw->pw_name, hostname); 227 return 0; 228 } 229 /* 230 * Return false if AllowGroups isn't empty and one of user's groups 231 * isn't listed there 232 */ 233 if (options.num_allow_groups > 0) 234 if (!ga_match(options.allow_groups, 235 options.num_allow_groups)) { 236 ga_free(); 237 logit("User %.100s from %.100s not allowed " 238 "because none of user's groups are listed " 239 "in AllowGroups", pw->pw_name, hostname); 240 return 0; 241 } 242 ga_free(); 243 } 244 245#ifdef CUSTOM_SYS_AUTH_ALLOWED_USER 246 if (!sys_auth_allowed_user(pw, &loginmsg)) 247 return 0; 248#endif 249 250 /* We found no reason not to let this user try to log on... */ 251 return 1; 252} 253 254void 255auth_log(Authctxt *authctxt, int authenticated, int partial, 256 const char *method, const char *submethod, const char *info) 257{ 258 void (*authlog) (const char *fmt,...) = verbose; 259 char *authmsg; 260 261 if (use_privsep && !mm_is_monitor() && !authctxt->postponed) 262 return; 263 264 /* Raise logging level */ 265 if (authenticated == 1 || 266 !authctxt->valid || 267 authctxt->failures >= options.max_authtries / 2 || 268 strcmp(method, "password") == 0) 269 authlog = logit; 270 271 if (authctxt->postponed) 272 authmsg = "Postponed"; 273 else if (partial) 274 authmsg = "Partial"; 275 else 276 authmsg = authenticated ? "Accepted" : "Failed"; 277 278 authlog("%s %s%s%s for %s%.100s from %.200s port %d%s", 279 authmsg, 280 method, 281 submethod != NULL ? "/" : "", submethod == NULL ? "" : submethod, 282 authctxt->valid ? "" : "invalid user ", 283 authctxt->user, 284 get_remote_ipaddr(), 285 get_remote_port(), 286 info); 287 288#ifdef CUSTOM_FAILED_LOGIN 289 if (authenticated == 0 && !authctxt->postponed && 290 (strcmp(method, "password") == 0 || 291 strncmp(method, "keyboard-interactive", 20) == 0 || 292 strcmp(method, "challenge-response") == 0)) 293 record_failed_login(authctxt->user, 294 get_canonical_hostname(options.use_dns), "ssh"); 295# ifdef WITH_AIXAUTHENTICATE 296 if (authenticated) 297 sys_auth_record_login(authctxt->user, 298 get_canonical_hostname(options.use_dns), "ssh", &loginmsg); 299# endif 300#endif 301#ifdef SSH_AUDIT_EVENTS 302 if (authenticated == 0 && !authctxt->postponed) 303 audit_event(audit_classify_auth(method)); 304#endif 305} 306 307/* 308 * Check whether root logins are disallowed. 309 */ 310int 311auth_root_allowed(const char *method) 312{ 313 switch (options.permit_root_login) { 314 case PERMIT_YES: 315 return 1; 316 case PERMIT_NO_PASSWD: 317 if (strcmp(method, "password") != 0) 318 return 1; 319 break; 320 case PERMIT_FORCED_ONLY: 321 if (forced_command) { 322 logit("Root login accepted for forced command."); 323 return 1; 324 } 325 break; 326 } 327 logit("ROOT LOGIN REFUSED FROM %.200s", get_remote_ipaddr()); 328 return 0; 329} 330 331 332/* 333 * Given a template and a passwd structure, build a filename 334 * by substituting % tokenised options. Currently, %% becomes '%', 335 * %h becomes the home directory and %u the username. 336 * 337 * This returns a buffer allocated by xmalloc. 338 */ 339char * 340expand_authorized_keys(const char *filename, struct passwd *pw) 341{ 342 char *file, ret[MAXPATHLEN]; 343 int i; 344 345 file = percent_expand(filename, "h", pw->pw_dir, 346 "u", pw->pw_name, (char *)NULL); 347 348 /* 349 * Ensure that filename starts anchored. If not, be backward 350 * compatible and prepend the '%h/' 351 */ 352 if (*file == '/') 353 return (file); 354 355 i = snprintf(ret, sizeof(ret), "%s/%s", pw->pw_dir, file); 356 if (i < 0 || (size_t)i >= sizeof(ret)) 357 fatal("expand_authorized_keys: path too long"); 358 xfree(file); 359 return (xstrdup(ret)); 360} 361 362char * 363authorized_principals_file(struct passwd *pw) 364{ 365 if (options.authorized_principals_file == NULL || 366 strcasecmp(options.authorized_principals_file, "none") == 0) 367 return NULL; 368 return expand_authorized_keys(options.authorized_principals_file, pw); 369} 370 371/* return ok if key exists in sysfile or userfile */ 372HostStatus 373check_key_in_hostfiles(struct passwd *pw, Key *key, const char *host, 374 const char *sysfile, const char *userfile) 375{ 376 char *user_hostfile; 377 struct stat st; 378 HostStatus host_status; 379 struct hostkeys *hostkeys; 380 const struct hostkey_entry *found; 381 382 hostkeys = init_hostkeys(); 383 load_hostkeys(hostkeys, host, sysfile); 384 if (userfile != NULL) { 385 user_hostfile = tilde_expand_filename(userfile, pw->pw_uid); 386 if (options.strict_modes && 387 (stat(user_hostfile, &st) == 0) && 388 ((st.st_uid != 0 && st.st_uid != pw->pw_uid) || 389 (st.st_mode & 022) != 0)) { 390 logit("Authentication refused for %.100s: " 391 "bad owner or modes for %.200s", 392 pw->pw_name, user_hostfile); 393 auth_debug_add("Ignored %.200s: bad ownership or modes", 394 user_hostfile); 395 } else { 396 temporarily_use_uid(pw); 397 load_hostkeys(hostkeys, host, user_hostfile); 398 restore_uid(); 399 } 400 xfree(user_hostfile); 401 } 402 host_status = check_key_in_hostkeys(hostkeys, key, &found); 403 if (host_status == HOST_REVOKED) 404 error("WARNING: revoked key for %s attempted authentication", 405 found->host); 406 else if (host_status == HOST_OK) 407 debug("%s: key for %s found at %s:%ld", __func__, 408 found->host, found->file, found->line); 409 else 410 debug("%s: key for host %s not found", __func__, host); 411 412 free_hostkeys(hostkeys); 413 414 return host_status; 415} 416 417/* 418 * Check a given path for security. This is defined as all components 419 * of the path to the file must be owned by either the owner of 420 * of the file or root and no directories must be group or world writable. 421 * 422 * XXX Should any specific check be done for sym links ? 423 * 424 * Takes a file name, its stat information (preferably from fstat() to 425 * avoid races), the uid of the expected owner, their home directory and an 426 * error buffer plus max size as arguments. 427 * 428 * Returns 0 on success and -1 on failure 429 */ 430int 431auth_secure_path(const char *name, struct stat *stp, const char *pw_dir, 432 uid_t uid, char *err, size_t errlen) 433{ 434 char buf[MAXPATHLEN], homedir[MAXPATHLEN]; 435 char *cp; 436 int comparehome = 0; 437 struct stat st; 438 439 if (realpath(name, buf) == NULL) { 440 snprintf(err, errlen, "realpath %s failed: %s", name, 441 strerror(errno)); 442 return -1; 443 } 444 if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL) 445 comparehome = 1; 446 447 if (!S_ISREG(stp->st_mode)) { 448 snprintf(err, errlen, "%s is not a regular file", buf); 449 return -1; 450 } 451 if ((!platform_sys_dir_uid(stp->st_uid) && stp->st_uid != uid) || 452 (stp->st_mode & 022) != 0) { 453 snprintf(err, errlen, "bad ownership or modes for file %s", 454 buf); 455 return -1; 456 } 457 458 /* for each component of the canonical path, walking upwards */ 459 for (;;) { 460 if ((cp = dirname(buf)) == NULL) { 461 snprintf(err, errlen, "dirname() failed"); 462 return -1; 463 } 464 strlcpy(buf, cp, sizeof(buf)); 465 466 if (stat(buf, &st) < 0 || 467 (!platform_sys_dir_uid(st.st_uid) && st.st_uid != uid) || 468 (st.st_mode & 022) != 0) { 469 snprintf(err, errlen, 470 "bad ownership or modes for directory %s", buf); 471 return -1; 472 } 473 474 /* If are past the homedir then we can stop */ 475 if (comparehome && strcmp(homedir, buf) == 0) 476 break; 477 478 /* 479 * dirname should always complete with a "/" path, 480 * but we can be paranoid and check for "." too 481 */ 482 if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0)) 483 break; 484 } 485 return 0; 486} 487 488/* 489 * Version of secure_path() that accepts an open file descriptor to 490 * avoid races. 491 * 492 * Returns 0 on success and -1 on failure 493 */ 494static int 495secure_filename(FILE *f, const char *file, struct passwd *pw, 496 char *err, size_t errlen) 497{ 498 struct stat st; 499 500 /* check the open file to avoid races */ 501 if (fstat(fileno(f), &st) < 0) { 502 snprintf(err, errlen, "cannot stat file %s: %s", 503 file, strerror(errno)); 504 return -1; 505 } 506 return auth_secure_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen); 507} 508 509static FILE * 510auth_openfile(const char *file, struct passwd *pw, int strict_modes, 511 int log_missing, char *file_type) 512{ 513 char line[1024]; 514 struct stat st; 515 int fd; 516 FILE *f; 517 518 if ((fd = open(file, O_RDONLY|O_NONBLOCK)) == -1) { 519 if (log_missing || errno != ENOENT) 520 debug("Could not open %s '%s': %s", file_type, file, 521 strerror(errno)); 522 return NULL; 523 } 524 525 if (fstat(fd, &st) < 0) { 526 close(fd); 527 return NULL; 528 } 529 if (!S_ISREG(st.st_mode)) { 530 logit("User %s %s %s is not a regular file", 531 pw->pw_name, file_type, file); 532 close(fd); 533 return NULL; 534 } 535 unset_nonblock(fd); 536 if ((f = fdopen(fd, "r")) == NULL) { 537 close(fd); 538 return NULL; 539 } 540 if (strict_modes && 541 secure_filename(f, file, pw, line, sizeof(line)) != 0) { 542 fclose(f); 543 logit("Authentication refused: %s", line); 544 auth_debug_add("Ignored %s: %s", file_type, line); 545 return NULL; 546 } 547 548 return f; 549} 550 551 552FILE * 553auth_openkeyfile(const char *file, struct passwd *pw, int strict_modes) 554{ 555 return auth_openfile(file, pw, strict_modes, 1, "authorized keys"); 556} 557 558FILE * 559auth_openprincipals(const char *file, struct passwd *pw, int strict_modes) 560{ 561 return auth_openfile(file, pw, strict_modes, 0, 562 "authorized principals"); 563} 564 565struct passwd * 566getpwnamallow(const char *user) 567{ 568#ifdef HAVE_LOGIN_CAP 569 extern login_cap_t *lc; 570#ifdef BSD_AUTH 571 auth_session_t *as; 572#endif 573#endif 574 struct passwd *pw; 575 struct connection_info *ci = get_connection_info(1, options.use_dns); 576 577 ci->user = user; 578 parse_server_match_config(&options, ci); 579 580#if defined(_AIX) && defined(HAVE_SETAUTHDB) 581 aix_setauthdb(user); 582#endif 583 584 pw = getpwnam(user); 585 586#if defined(_AIX) && defined(HAVE_SETAUTHDB) 587 aix_restoreauthdb(); 588#endif 589#ifdef HAVE_CYGWIN 590 /* 591 * Windows usernames are case-insensitive. To avoid later problems 592 * when trying to match the username, the user is only allowed to 593 * login if the username is given in the same case as stored in the 594 * user database. 595 */ 596 if (pw != NULL && strcmp(user, pw->pw_name) != 0) { 597 logit("Login name %.100s does not match stored username %.100s", 598 user, pw->pw_name); 599 pw = NULL; 600 } 601#endif 602 if (pw == NULL) { 603 logit("Invalid user %.100s from %.100s", 604 user, get_remote_ipaddr()); 605#ifdef CUSTOM_FAILED_LOGIN 606 record_failed_login(user, 607 get_canonical_hostname(options.use_dns), "ssh"); 608#endif 609#ifdef SSH_AUDIT_EVENTS 610 audit_event(SSH_INVALID_USER); 611#endif /* SSH_AUDIT_EVENTS */ 612 return (NULL); 613 } 614 if (!allowed_user(pw)) 615 return (NULL); 616#ifdef HAVE_LOGIN_CAP 617 if ((lc = login_getclass(pw->pw_class)) == NULL) { 618 debug("unable to get login class: %s", user); 619 return (NULL); 620 } 621#ifdef BSD_AUTH 622 if ((as = auth_open()) == NULL || auth_setpwd(as, pw) != 0 || 623 auth_approval(as, lc, pw->pw_name, "ssh") <= 0) { 624 debug("Approval failure for %s", user); 625 pw = NULL; 626 } 627 if (as != NULL) 628 auth_close(as); 629#endif 630#endif 631 if (pw != NULL) 632 return (pwcopy(pw)); 633 return (NULL); 634} 635 636/* Returns 1 if key is revoked by revoked_keys_file, 0 otherwise */ 637int 638auth_key_is_revoked(Key *key) 639{ 640 char *key_fp; 641 642 if (options.revoked_keys_file == NULL) 643 return 0; 644 switch (ssh_krl_file_contains_key(options.revoked_keys_file, key)) { 645 case 0: 646 return 0; /* Not revoked */ 647 case -2: 648 break; /* Not a KRL */ 649 default: 650 goto revoked; 651 } 652 debug3("%s: treating %s as a key list", __func__, 653 options.revoked_keys_file); 654 switch (key_in_file(key, options.revoked_keys_file, 0)) { 655 case 0: 656 /* key not revoked */ 657 return 0; 658 case -1: 659 /* Error opening revoked_keys_file: refuse all keys */ 660 error("Revoked keys file is unreadable: refusing public key " 661 "authentication"); 662 return 1; 663 case 1: 664 revoked: 665 /* Key revoked */ 666 key_fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); 667 error("WARNING: authentication attempt with a revoked " 668 "%s key %s ", key_type(key), key_fp); 669 xfree(key_fp); 670 return 1; 671 } 672 fatal("key_in_file returned junk"); 673} 674 675void 676auth_debug_add(const char *fmt,...) 677{ 678 char buf[1024]; 679 va_list args; 680 681 if (!auth_debug_init) 682 return; 683 684 va_start(args, fmt); 685 vsnprintf(buf, sizeof(buf), fmt, args); 686 va_end(args); 687 buffer_put_cstring(&auth_debug, buf); 688} 689 690void 691auth_debug_send(void) 692{ 693 char *msg; 694 695 if (!auth_debug_init) 696 return; 697 while (buffer_len(&auth_debug)) { 698 msg = buffer_get_string(&auth_debug, NULL); 699 packet_send_debug("%s", msg); 700 xfree(msg); 701 } 702} 703 704void 705auth_debug_reset(void) 706{ 707 if (auth_debug_init) 708 buffer_clear(&auth_debug); 709 else { 710 buffer_init(&auth_debug); 711 auth_debug_init = 1; 712 } 713} 714 715struct passwd * 716fakepw(void) 717{ 718 static struct passwd fake; 719 720 memset(&fake, 0, sizeof(fake)); 721 fake.pw_name = "NOUSER"; 722 fake.pw_passwd = 723 "$2a$06$r3.juUaHZDlIbQaO2dS9FuYxL1W9M81R1Tc92PoSNmzvpEqLkLGrK"; 724 fake.pw_gecos = "NOUSER"; 725 fake.pw_uid = privsep_pw == NULL ? (uid_t)-1 : privsep_pw->pw_uid; 726 fake.pw_gid = privsep_pw == NULL ? (gid_t)-1 : privsep_pw->pw_gid; 727#ifdef HAVE_PW_CLASS_IN_PASSWD 728 fake.pw_class = ""; 729#endif 730 fake.pw_dir = "/nonexist"; 731 fake.pw_shell = "/nonexist"; 732 733 return (&fake); 734} 735