login.c revision 1.89
1 /* $NetBSD: login.c,v 1.89 2006/03/23 23:33:28 wiz Exp $ */ 2 3 /*- 4 * Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT( 35 "@(#) Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994\n\ 36 The Regents of the University of California. All rights reserved.\n"); 37 #endif /* not lint */ 38 39 #ifndef lint 40 #if 0 41 static char sccsid[] = "@(#)login.c 8.4 (Berkeley) 4/2/94"; 42 #endif 43 __RCSID("$NetBSD: login.c,v 1.89 2006/03/23 23:33:28 wiz Exp $"); 44 #endif /* not lint */ 45 46 /* 47 * login [ name ] 48 * login -h hostname (for telnetd, etc.) 49 * login -f name (for pre-authenticated login: datakit, xterm, etc.) 50 */ 51 52 #include <sys/param.h> 53 #include <sys/stat.h> 54 #include <sys/time.h> 55 #include <sys/resource.h> 56 #include <sys/file.h> 57 #include <sys/wait.h> 58 #include <sys/socket.h> 59 60 #include <err.h> 61 #include <errno.h> 62 #include <grp.h> 63 #include <pwd.h> 64 #include <setjmp.h> 65 #include <signal.h> 66 #include <stdio.h> 67 #include <stdlib.h> 68 #include <string.h> 69 #include <syslog.h> 70 #include <time.h> 71 #include <ttyent.h> 72 #include <tzfile.h> 73 #include <unistd.h> 74 #ifdef SUPPORT_UTMP 75 #include <utmp.h> 76 #endif 77 #ifdef SUPPORT_UTMPX 78 #include <utmpx.h> 79 #endif 80 #include <util.h> 81 #ifdef SKEY 82 #include <skey.h> 83 #endif 84 #ifdef KERBEROS5 85 #include <krb5/krb5.h> 86 #include <com_err.h> 87 #endif 88 #ifdef LOGIN_CAP 89 #include <login_cap.h> 90 #endif 91 #include <vis.h> 92 93 #include "pathnames.h" 94 95 #ifdef KERBEROS5 96 int login_krb5_get_tickets = 1; 97 int login_krb5_forwardable_tgt = 0; 98 int login_krb5_retain_ccache = 0; 99 #endif 100 101 void badlogin(char *); 102 void checknologin(char *); 103 #ifdef SUPPORT_UTMP 104 static void doutmp(void); 105 static void dolastlog(int); 106 #endif 107 #ifdef SUPPORT_UTMPX 108 static void doutmpx(void); 109 static void dolastlogx(int); 110 #endif 111 static void update_db(int); 112 void getloginname(void); 113 void motd(char *); 114 int rootterm(char *); 115 void sigint(int); 116 void sleepexit(int); 117 const char *stypeof(const char *); 118 void timedout(int); 119 #ifdef KERBEROS5 120 int k5login(struct passwd *, char *, char *, char *); 121 void k5destroy(void); 122 int k5_read_creds(char*); 123 int k5_write_creds(void); 124 #endif 125 #if defined(KERBEROS5) 126 void dofork(void); 127 #endif 128 void decode_ss(const char *); 129 void usage(void); 130 131 #define TTYGRPNAME "tty" /* name of group to own ttys */ 132 133 #define DEFAULT_BACKOFF 3 134 #define DEFAULT_RETRIES 10 135 136 /* 137 * This bounds the time given to login. Not a define so it can 138 * be patched on machines where it's too small. 139 */ 140 u_int timeout = 300; 141 142 #if defined(KERBEROS5) 143 int notickets = 1; 144 char *instance; 145 int has_ccache = 0; 146 extern krb5_context kcontext; 147 extern int have_forward; 148 extern char *krb5tkfile_env; 149 extern int krb5_configured; 150 #endif 151 152 #if defined(KERBEROS5) 153 #define KERBEROS_CONFIGURED krb5_configured 154 #endif 155 156 struct passwd *pwd; 157 int failures, have_ss; 158 char term[64], *envinit[1], *hostname, *username, *tty, *nested; 159 struct timeval now; 160 struct sockaddr_storage ss; 161 162 extern const char copyrightstr[]; 163 164 int 165 main(int argc, char *argv[]) 166 { 167 extern char **environ; 168 struct group *gr; 169 struct stat st; 170 int ask, ch, cnt, fflag, hflag, pflag, sflag, quietlog, rootlogin, rval; 171 int Fflag; 172 uid_t uid, saved_uid; 173 gid_t saved_gid, saved_gids[NGROUPS_MAX]; 174 int nsaved_gids; 175 char *domain, *p, *ttyn, *pwprompt; 176 const char *salt; 177 char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10]; 178 char localhost[MAXHOSTNAMELEN + 1]; 179 int need_chpass, require_chpass; 180 int login_retries = DEFAULT_RETRIES, 181 login_backoff = DEFAULT_BACKOFF; 182 time_t pw_warntime = _PASSWORD_WARNDAYS * SECSPERDAY; 183 #ifdef KERBEROS5 184 krb5_error_code kerror; 185 #endif 186 #if defined(KERBEROS5) 187 int got_tickets = 0; 188 #endif 189 #ifdef LOGIN_CAP 190 char *shell = NULL; 191 login_cap_t *lc = NULL; 192 #endif 193 194 tbuf[0] = '\0'; 195 rval = 0; 196 pwprompt = NULL; 197 nested = NULL; 198 need_chpass = require_chpass = 0; 199 200 (void)signal(SIGALRM, timedout); 201 (void)alarm(timeout); 202 (void)signal(SIGQUIT, SIG_IGN); 203 (void)signal(SIGINT, SIG_IGN); 204 (void)setpriority(PRIO_PROCESS, 0, 0); 205 206 openlog("login", 0, LOG_AUTH); 207 208 /* 209 * -p is used by getty to tell login not to destroy the environment 210 * -f is used to skip a second login authentication 211 * -h is used by other servers to pass the name of the remote host to 212 * login so that it may be placed in utmp/utmpx and wtmp/wtmpx 213 * -a in addition to -h, a server may supply -a to pass the actual 214 * server address. 215 * -s is used to force use of S/Key or equivalent. 216 */ 217 domain = NULL; 218 if (gethostname(localhost, sizeof(localhost)) < 0) 219 syslog(LOG_ERR, "couldn't get local hostname: %m"); 220 else 221 domain = strchr(localhost, '.'); 222 localhost[sizeof(localhost) - 1] = '\0'; 223 224 Fflag = fflag = hflag = pflag = sflag = 0; 225 have_ss = 0; 226 #ifdef KERBEROS5 227 have_forward = 0; 228 #endif 229 uid = getuid(); 230 while ((ch = getopt(argc, argv, "a:Ffh:ps")) != -1) 231 switch (ch) { 232 case 'a': 233 if (uid) 234 errx(1, "-a option: %s", strerror(EPERM)); 235 decode_ss(optarg); 236 #ifdef notdef 237 (void)sockaddr_snprintf(optarg, 238 sizeof(struct sockaddr_storage), "%a", (void *)&ss); 239 #endif 240 break; 241 case 'F': 242 Fflag = 1; 243 /* FALLTHROUGH */ 244 case 'f': 245 fflag = 1; 246 break; 247 case 'h': 248 if (uid) 249 errx(1, "-h option: %s", strerror(EPERM)); 250 hflag = 1; 251 #ifdef notdef 252 if (domain && (p = strchr(optarg, '.')) != NULL && 253 strcasecmp(p, domain) == 0) 254 *p = '\0'; 255 #endif 256 hostname = optarg; 257 break; 258 case 'p': 259 pflag = 1; 260 break; 261 case 's': 262 sflag = 1; 263 break; 264 default: 265 case '?': 266 usage(); 267 break; 268 } 269 270 setproctitle(NULL); 271 argc -= optind; 272 argv += optind; 273 274 if (*argv) { 275 username = *argv; 276 ask = 0; 277 } else 278 ask = 1; 279 280 #ifdef F_CLOSEM 281 (void)fcntl(3, F_CLOSEM, 0); 282 #else 283 for (cnt = getdtablesize(); cnt > 2; cnt--) 284 (void)close(cnt); 285 #endif 286 287 ttyn = ttyname(STDIN_FILENO); 288 if (ttyn == NULL || *ttyn == '\0') { 289 (void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY); 290 ttyn = tname; 291 } 292 if ((tty = strstr(ttyn, "/pts/")) != NULL) 293 ++tty; 294 else if ((tty = strrchr(ttyn, '/')) != NULL) 295 ++tty; 296 else 297 tty = ttyn; 298 299 if (issetugid()) { 300 nested = strdup(user_from_uid(getuid(), 0)); 301 if (nested == NULL) { 302 syslog(LOG_ERR, "strdup: %m"); 303 sleepexit(1); 304 } 305 } 306 307 #ifdef LOGIN_CAP 308 /* Get "login-retries" and "login-backoff" from default class */ 309 if ((lc = login_getclass(NULL)) != NULL) { 310 login_retries = (int)login_getcapnum(lc, "login-retries", 311 DEFAULT_RETRIES, DEFAULT_RETRIES); 312 login_backoff = (int)login_getcapnum(lc, "login-backoff", 313 DEFAULT_BACKOFF, DEFAULT_BACKOFF); 314 login_close(lc); 315 lc = NULL; 316 } 317 #endif 318 319 #ifdef KERBEROS5 320 kerror = krb5_init_context(&kcontext); 321 if (kerror) { 322 /* 323 * If Kerberos is not configured, that is, we are 324 * not using Kerberos, do not log the error message. 325 * However, if Kerberos is configured, and the 326 * context init fails for some other reason, we need 327 * to issue a no tickets warning to the user when the 328 * login succeeds. 329 */ 330 if (kerror != ENXIO) { /* XXX NetBSD-local Heimdal hack */ 331 syslog(LOG_NOTICE, 332 "%s when initializing Kerberos context", 333 error_message(kerror)); 334 krb5_configured = 1; 335 } 336 login_krb5_get_tickets = 0; 337 } 338 #endif /* KERBEROS5 */ 339 340 for (cnt = 0;; ask = 1) { 341 #if defined(KERBEROS5) 342 if (login_krb5_get_tickets) 343 k5destroy(); 344 #endif 345 if (ask) { 346 fflag = 0; 347 getloginname(); 348 } 349 rootlogin = 0; 350 #ifdef KERBEROS5 351 if ((instance = strchr(username, '/')) != NULL) 352 *instance++ = '\0'; 353 else 354 instance = ""; 355 #endif 356 if (strlen(username) > MAXLOGNAME) 357 username[MAXLOGNAME] = '\0'; 358 359 /* 360 * Note if trying multiple user names; log failures for 361 * previous user name, but don't bother logging one failure 362 * for nonexistent name (mistyped username). 363 */ 364 if (failures && strcmp(tbuf, username)) { 365 if (failures > (pwd ? 0 : 1)) 366 badlogin(tbuf); 367 failures = 0; 368 } 369 (void)strlcpy(tbuf, username, sizeof(tbuf)); 370 371 if ((pwd = getpwnam(username)) != NULL) 372 salt = pwd->pw_passwd; 373 else 374 salt = "xx"; 375 376 #ifdef LOGIN_CAP 377 /* 378 * Establish the class now, before we might goto 379 * within the next block. pwd can be NULL since it 380 * falls back to the "default" class if it is. 381 */ 382 lc = login_getclass(pwd ? pwd->pw_class : NULL); 383 #endif 384 /* 385 * if we have a valid account name, and it doesn't have a 386 * password, or the -f option was specified and the caller 387 * is root or the caller isn't changing their uid, don't 388 * authenticate. 389 */ 390 if (pwd) { 391 if (pwd->pw_uid == 0) 392 rootlogin = 1; 393 394 if (fflag && (uid == 0 || uid == pwd->pw_uid)) { 395 /* already authenticated */ 396 #ifdef KERBEROS5 397 if (login_krb5_get_tickets && Fflag) 398 k5_read_creds(username); 399 #endif 400 break; 401 } else if (pwd->pw_passwd[0] == '\0') { 402 /* pretend password okay */ 403 rval = 0; 404 goto ttycheck; 405 } 406 } 407 408 fflag = 0; 409 410 (void)setpriority(PRIO_PROCESS, 0, -4); 411 412 #ifdef SKEY 413 if (skey_haskey(username) == 0) { 414 static char skprompt[80]; 415 const char *skinfo = skey_keyinfo(username); 416 417 (void)snprintf(skprompt, sizeof(skprompt), 418 "Password [ %s ]:", 419 skinfo ? skinfo : "error getting challenge"); 420 pwprompt = skprompt; 421 } else 422 #endif 423 pwprompt = "Password:"; 424 425 p = getpass(pwprompt); 426 427 if (pwd == NULL) { 428 rval = 1; 429 goto skip; 430 } 431 #ifdef KERBEROS5 432 if (login_krb5_get_tickets && 433 k5login(pwd, instance, localhost, p) == 0) { 434 rval = 0; 435 got_tickets = 1; 436 } 437 #endif 438 #if defined(KERBEROS5) 439 if (got_tickets) 440 goto skip; 441 #endif 442 #ifdef SKEY 443 if (skey_haskey(username) == 0 && 444 skey_passcheck(username, p) != -1) { 445 rval = 0; 446 goto skip; 447 } 448 #endif 449 if (!sflag && *pwd->pw_passwd != '\0' && 450 !strcmp(crypt(p, pwd->pw_passwd), pwd->pw_passwd)) { 451 rval = 0; 452 require_chpass = 1; 453 goto skip; 454 } 455 rval = 1; 456 457 skip: 458 memset(p, 0, strlen(p)); 459 460 (void)setpriority(PRIO_PROCESS, 0, 0); 461 462 ttycheck: 463 /* 464 * If trying to log in as root without Kerberos, 465 * but with insecure terminal, refuse the login attempt. 466 */ 467 if (pwd && !rval && rootlogin && !rootterm(tty)) { 468 (void)printf("Login incorrect or refused on this " 469 "terminal.\n"); 470 if (hostname) 471 syslog(LOG_NOTICE, 472 "LOGIN %s REFUSED FROM %s ON TTY %s", 473 pwd->pw_name, hostname, tty); 474 else 475 syslog(LOG_NOTICE, 476 "LOGIN %s REFUSED ON TTY %s", 477 pwd->pw_name, tty); 478 continue; 479 } 480 481 if (pwd && !rval) 482 break; 483 484 (void)printf("Login incorrect or refused on this " 485 "terminal.\n"); 486 failures++; 487 cnt++; 488 /* 489 * We allow login_retries tries, but after login_backoff 490 * we start backing off. These default to 10 and 3 491 * respectively. 492 */ 493 if (cnt > login_backoff) { 494 if (cnt >= login_retries) { 495 badlogin(username); 496 sleepexit(1); 497 } 498 sleep((u_int)((cnt - login_backoff) * 5)); 499 } 500 } 501 502 /* committed to login -- turn off timeout */ 503 (void)alarm((u_int)0); 504 505 endpwent(); 506 507 /* if user not super-user, check for disabled logins */ 508 #ifdef LOGIN_CAP 509 if (!login_getcapbool(lc, "ignorenologin", rootlogin)) 510 checknologin(login_getcapstr(lc, "nologin", NULL, NULL)); 511 #else 512 if (!rootlogin) 513 checknologin(NULL); 514 #endif 515 516 #ifdef LOGIN_CAP 517 quietlog = login_getcapbool(lc, "hushlogin", 0); 518 #else 519 quietlog = 0; 520 #endif 521 /* Temporarily give up special privileges so we can change */ 522 /* into NFS-mounted homes that are exported for non-root */ 523 /* access and have mode 7x0 */ 524 saved_uid = geteuid(); 525 saved_gid = getegid(); 526 nsaved_gids = getgroups(NGROUPS_MAX, saved_gids); 527 528 (void)setegid(pwd->pw_gid); 529 initgroups(username, pwd->pw_gid); 530 (void)seteuid(pwd->pw_uid); 531 532 if (chdir(pwd->pw_dir) < 0) { 533 #ifdef LOGIN_CAP 534 if (login_getcapbool(lc, "requirehome", 0)) { 535 (void)printf("Home directory %s required\n", 536 pwd->pw_dir); 537 sleepexit(1); 538 } 539 #endif 540 (void)printf("No home directory %s!\n", pwd->pw_dir); 541 if (chdir("/")) 542 exit(0); 543 pwd->pw_dir = "/"; 544 (void)printf("Logging in with home = \"/\".\n"); 545 } 546 547 if (!quietlog) 548 quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0; 549 550 /* regain special privileges */ 551 (void)seteuid(saved_uid); 552 setgroups(nsaved_gids, saved_gids); 553 (void)setegid(saved_gid); 554 555 #ifdef LOGIN_CAP 556 pw_warntime = login_getcaptime(lc, "password-warn", 557 _PASSWORD_WARNDAYS * SECSPERDAY, 558 _PASSWORD_WARNDAYS * SECSPERDAY); 559 #endif 560 561 (void)gettimeofday(&now, (struct timezone *)NULL); 562 if (pwd->pw_expire) { 563 if (now.tv_sec >= pwd->pw_expire) { 564 (void)printf("Sorry -- your account has expired.\n"); 565 sleepexit(1); 566 } else if (pwd->pw_expire - now.tv_sec < pw_warntime && 567 !quietlog) 568 (void)printf("Warning: your account expires on %s", 569 ctime(&pwd->pw_expire)); 570 } 571 if (pwd->pw_change) { 572 if (pwd->pw_change == _PASSWORD_CHGNOW) 573 need_chpass = 1; 574 else if (now.tv_sec >= pwd->pw_change) { 575 (void)printf("Sorry -- your password has expired.\n"); 576 sleepexit(1); 577 } else if (pwd->pw_change - now.tv_sec < pw_warntime && 578 !quietlog) 579 (void)printf("Warning: your password expires on %s", 580 ctime(&pwd->pw_change)); 581 582 } 583 /* Nothing else left to fail -- really log in. */ 584 update_db(quietlog); 585 586 (void)chown(ttyn, pwd->pw_uid, 587 (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid); 588 589 if (ttyaction(ttyn, "login", pwd->pw_name)) 590 (void)printf("Warning: ttyaction failed.\n"); 591 592 #if defined(KERBEROS5) 593 /* Fork so that we can call kdestroy */ 594 if (! login_krb5_retain_ccache && has_ccache) 595 dofork(); 596 #endif 597 598 /* Destroy environment unless user has requested its preservation. */ 599 if (!pflag) 600 environ = envinit; 601 602 #ifdef LOGIN_CAP 603 if (nested == NULL && setusercontext(lc, pwd, pwd->pw_uid, 604 LOGIN_SETLOGIN) != 0) { 605 syslog(LOG_ERR, "setusercontext failed"); 606 exit(1); 607 } 608 if (setusercontext(lc, pwd, pwd->pw_uid, 609 (LOGIN_SETALL & ~(LOGIN_SETPATH|LOGIN_SETLOGIN))) != 0) { 610 syslog(LOG_ERR, "setusercontext failed"); 611 exit(1); 612 } 613 #else 614 (void)setgid(pwd->pw_gid); 615 616 initgroups(username, pwd->pw_gid); 617 618 if (nested == NULL && setlogin(pwd->pw_name) < 0) 619 syslog(LOG_ERR, "setlogin() failure: %m"); 620 621 /* Discard permissions last so can't get killed and drop core. */ 622 if (rootlogin) 623 (void)setuid(0); 624 else 625 (void)setuid(pwd->pw_uid); 626 #endif 627 628 if (*pwd->pw_shell == '\0') 629 pwd->pw_shell = _PATH_BSHELL; 630 #ifdef LOGIN_CAP 631 if ((shell = login_getcapstr(lc, "shell", NULL, NULL)) != NULL) { 632 if ((shell = strdup(shell)) == NULL) { 633 syslog(LOG_ERR, "Cannot alloc mem"); 634 sleepexit(1); 635 } 636 pwd->pw_shell = shell; 637 } 638 #endif 639 640 (void)setenv("HOME", pwd->pw_dir, 1); 641 (void)setenv("SHELL", pwd->pw_shell, 1); 642 if (term[0] == '\0') { 643 char *tt = (char *)stypeof(tty); 644 #ifdef LOGIN_CAP 645 if (tt == NULL) 646 tt = login_getcapstr(lc, "term", NULL, NULL); 647 #endif 648 /* unknown term -> "su" */ 649 (void)strlcpy(term, tt != NULL ? tt : "su", sizeof(term)); 650 } 651 (void)setenv("TERM", term, 0); 652 (void)setenv("LOGNAME", pwd->pw_name, 1); 653 (void)setenv("USER", pwd->pw_name, 1); 654 655 #ifdef LOGIN_CAP 656 setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETPATH); 657 #else 658 (void)setenv("PATH", _PATH_DEFPATH, 0); 659 #endif 660 661 #ifdef KERBEROS5 662 if (krb5tkfile_env) 663 (void)setenv("KRB5CCNAME", krb5tkfile_env, 1); 664 #endif 665 666 if (tty[sizeof("tty")-1] == 'd') 667 syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name); 668 669 /* If fflag is on, assume caller/authenticator has logged root login. */ 670 if (rootlogin && fflag == 0) { 671 if (hostname) 672 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s", 673 username, tty, hostname); 674 else 675 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", 676 username, tty); 677 } 678 679 #if defined(KERBEROS5) 680 if (KERBEROS_CONFIGURED && !quietlog && notickets == 1) 681 (void)printf("Warning: no Kerberos tickets issued.\n"); 682 #endif 683 684 if (!quietlog) { 685 char *fname; 686 #ifdef LOGIN_CAP 687 fname = login_getcapstr(lc, "copyright", NULL, NULL); 688 if (fname != NULL && access(fname, F_OK) == 0) 689 motd(fname); 690 else 691 #endif 692 (void)printf("%s", copyrightstr); 693 694 #ifdef LOGIN_CAP 695 fname = login_getcapstr(lc, "welcome", NULL, NULL); 696 if (fname == NULL || access(fname, F_OK) != 0) 697 #endif 698 fname = _PATH_MOTDFILE; 699 motd(fname); 700 701 (void)snprintf(tbuf, 702 sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pwd->pw_name); 703 if (stat(tbuf, &st) == 0 && st.st_size != 0) 704 (void)printf("You have %smail.\n", 705 (st.st_mtime > st.st_atime) ? "new " : ""); 706 } 707 708 #ifdef LOGIN_CAP 709 login_close(lc); 710 #endif 711 712 (void)signal(SIGALRM, SIG_DFL); 713 (void)signal(SIGQUIT, SIG_DFL); 714 (void)signal(SIGINT, SIG_DFL); 715 (void)signal(SIGTSTP, SIG_IGN); 716 717 tbuf[0] = '-'; 718 (void)strlcpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ? 719 p + 1 : pwd->pw_shell, sizeof(tbuf) - 1); 720 721 /* Wait to change password until we're unprivileged */ 722 if (need_chpass) { 723 if (!require_chpass) 724 (void)printf( 725 "Warning: your password has expired. Please change it as soon as possible.\n"); 726 else { 727 int status; 728 729 (void)printf( 730 "Your password has expired. Please choose a new one.\n"); 731 switch (fork()) { 732 case -1: 733 warn("fork"); 734 sleepexit(1); 735 case 0: 736 execl(_PATH_BINPASSWD, "passwd", 0); 737 _exit(1); 738 default: 739 if (wait(&status) == -1 || 740 WEXITSTATUS(status)) 741 sleepexit(1); 742 } 743 } 744 } 745 746 #ifdef KERBEROS5 747 if (login_krb5_get_tickets) 748 k5_write_creds(); 749 #endif 750 execlp(pwd->pw_shell, tbuf, 0); 751 err(1, "%s", pwd->pw_shell); 752 } 753 754 #if defined(KERBEROS5) 755 #define NBUFSIZ (MAXLOGNAME + 1 + 5) /* .root suffix */ 756 #else 757 #define NBUFSIZ (MAXLOGNAME + 1) 758 #endif 759 760 #if defined(KERBEROS5) 761 /* 762 * This routine handles cleanup stuff, and the like. 763 * It exists only in the child process. 764 */ 765 #include <sys/wait.h> 766 void 767 dofork(void) 768 { 769 int child; 770 771 if (!(child = fork())) 772 return; /* Child process */ 773 774 /* 775 * Setup stuff? This would be things we could do in parallel 776 * with login 777 */ 778 (void)chdir("/"); /* Let's not keep the fs busy... */ 779 780 /* If we're the parent, watch the child until it dies */ 781 while (wait(0) != child) 782 ; 783 784 /* Cleanup stuff */ 785 /* Run kdestroy to destroy tickets */ 786 if (login_krb5_get_tickets) 787 k5destroy(); 788 789 /* Leave */ 790 exit(0); 791 } 792 #endif 793 794 void 795 getloginname(void) 796 { 797 int ch; 798 char *p; 799 static char nbuf[NBUFSIZ]; 800 801 for (;;) { 802 (void)printf("login: "); 803 for (p = nbuf; (ch = getchar()) != '\n'; ) { 804 if (ch == EOF) { 805 badlogin(username); 806 exit(0); 807 } 808 if (p < nbuf + (NBUFSIZ - 1)) 809 *p++ = ch; 810 } 811 if (p > nbuf) { 812 if (nbuf[0] == '-') 813 (void)fprintf(stderr, 814 "login names may not start with '-'.\n"); 815 else { 816 *p = '\0'; 817 username = nbuf; 818 break; 819 } 820 } 821 } 822 } 823 824 int 825 rootterm(char *ttyn) 826 { 827 struct ttyent *t; 828 829 return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE); 830 } 831 832 jmp_buf motdinterrupt; 833 834 void 835 motd(char *fname) 836 { 837 int fd, nchars; 838 sig_t oldint; 839 char tbuf[8192]; 840 841 if ((fd = open(fname ? fname : _PATH_MOTDFILE, O_RDONLY, 0)) < 0) 842 return; 843 oldint = signal(SIGINT, sigint); 844 if (setjmp(motdinterrupt) == 0) 845 while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0) 846 (void)write(fileno(stdout), tbuf, nchars); 847 (void)signal(SIGINT, oldint); 848 (void)close(fd); 849 } 850 851 /* ARGSUSED */ 852 void 853 sigint(int signo) 854 { 855 856 longjmp(motdinterrupt, 1); 857 } 858 859 /* ARGSUSED */ 860 void 861 timedout(int signo) 862 { 863 864 (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout); 865 exit(0); 866 } 867 868 void 869 checknologin(char *fname) 870 { 871 int fd, nchars; 872 char tbuf[8192]; 873 874 if ((fd = open(fname ? fname : _PATH_NOLOGIN, O_RDONLY, 0)) >= 0) { 875 while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0) 876 (void)write(fileno(stdout), tbuf, nchars); 877 sleepexit(0); 878 } 879 } 880 881 static void 882 update_db(int quietlog) 883 { 884 if (nested != NULL) { 885 if (hostname != NULL) 886 syslog(LOG_NOTICE, "%s to %s on tty %s from %s", 887 nested, pwd->pw_name, tty, hostname); 888 else 889 syslog(LOG_NOTICE, "%s to %s on tty %s", nested, 890 pwd->pw_name, tty); 891 892 return; 893 } 894 if (hostname != NULL && have_ss == 0) { 895 socklen_t len = sizeof(ss); 896 have_ss = getpeername(STDIN_FILENO, (struct sockaddr *)&ss, 897 &len) != -1; 898 } 899 (void)gettimeofday(&now, NULL); 900 #ifdef SUPPORT_UTMPX 901 doutmpx(); 902 dolastlogx(quietlog); 903 quietlog = 1; 904 #endif 905 #ifdef SUPPORT_UTMP 906 doutmp(); 907 dolastlog(quietlog); 908 #endif 909 } 910 911 #ifdef SUPPORT_UTMPX 912 static void 913 doutmpx(void) 914 { 915 struct utmpx utmpx; 916 char *t; 917 918 memset((void *)&utmpx, 0, sizeof(utmpx)); 919 utmpx.ut_tv = now; 920 (void)strncpy(utmpx.ut_name, username, sizeof(utmpx.ut_name)); 921 if (hostname) { 922 (void)strncpy(utmpx.ut_host, hostname, sizeof(utmpx.ut_host)); 923 utmpx.ut_ss = ss; 924 } 925 (void)strncpy(utmpx.ut_line, tty, sizeof(utmpx.ut_line)); 926 utmpx.ut_type = USER_PROCESS; 927 utmpx.ut_pid = getpid(); 928 t = tty + strlen(tty); 929 if (t - tty >= sizeof(utmpx.ut_id)) { 930 (void)strncpy(utmpx.ut_id, t - sizeof(utmpx.ut_id), 931 sizeof(utmpx.ut_id)); 932 } else { 933 (void)strncpy(utmpx.ut_id, tty, sizeof(utmpx.ut_id)); 934 } 935 if (pututxline(&utmpx) == NULL) 936 syslog(LOG_NOTICE, "Cannot update utmpx: %m"); 937 endutxent(); 938 if (updwtmpx(_PATH_WTMPX, &utmpx) != 0) 939 syslog(LOG_NOTICE, "Cannot update wtmpx: %m"); 940 } 941 942 static void 943 dolastlogx(int quiet) 944 { 945 struct lastlogx ll; 946 if (!quiet && getlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != NULL) { 947 time_t t = (time_t)ll.ll_tv.tv_sec; 948 (void)printf("Last login: %.24s ", ctime(&t)); 949 if (*ll.ll_host != '\0') 950 (void)printf("from %.*s ", 951 (int)sizeof(ll.ll_host), 952 ll.ll_host); 953 (void)printf("on %.*s\n", 954 (int)sizeof(ll.ll_line), 955 ll.ll_line); 956 } 957 ll.ll_tv = now; 958 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 959 if (hostname) 960 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 961 else 962 (void)memset(ll.ll_host, '\0', sizeof(ll.ll_host)); 963 if (have_ss) 964 ll.ll_ss = ss; 965 else 966 (void)memset(&ll.ll_ss, 0, sizeof(ll.ll_ss)); 967 if (updlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != 0) 968 syslog(LOG_NOTICE, "Cannot update lastlogx: %m"); 969 } 970 #endif 971 972 #ifdef SUPPORT_UTMP 973 static void 974 doutmp(void) 975 { 976 struct utmp utmp; 977 978 (void)memset((void *)&utmp, 0, sizeof(utmp)); 979 utmp.ut_time = now.tv_sec; 980 (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name)); 981 if (hostname) 982 (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host)); 983 (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line)); 984 login(&utmp); 985 } 986 987 static void 988 dolastlog(int quiet) 989 { 990 struct lastlog ll; 991 int fd; 992 993 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) { 994 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), SEEK_SET); 995 if (!quiet) { 996 if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) && 997 ll.ll_time != 0) { 998 (void)printf("Last login: %.24s ", 999 ctime(&ll.ll_time)); 1000 if (*ll.ll_host != '\0') 1001 (void)printf("from %.*s ", 1002 (int)sizeof(ll.ll_host), 1003 ll.ll_host); 1004 (void)printf("on %.*s\n", 1005 (int)sizeof(ll.ll_line), ll.ll_line); 1006 } 1007 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), 1008 SEEK_SET); 1009 } 1010 memset((void *)&ll, 0, sizeof(ll)); 1011 ll.ll_time = now.tv_sec; 1012 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 1013 if (hostname) 1014 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 1015 (void)write(fd, (char *)&ll, sizeof(ll)); 1016 (void)close(fd); 1017 } 1018 } 1019 #endif 1020 1021 void 1022 badlogin(char *name) 1023 { 1024 1025 if (failures == 0) 1026 return; 1027 if (hostname) { 1028 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s", 1029 failures, failures > 1 ? "S" : "", hostname); 1030 syslog(LOG_AUTHPRIV|LOG_NOTICE, 1031 "%d LOGIN FAILURE%s FROM %s, %s", 1032 failures, failures > 1 ? "S" : "", hostname, name); 1033 } else { 1034 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s", 1035 failures, failures > 1 ? "S" : "", tty); 1036 syslog(LOG_AUTHPRIV|LOG_NOTICE, 1037 "%d LOGIN FAILURE%s ON %s, %s", 1038 failures, failures > 1 ? "S" : "", tty, name); 1039 } 1040 } 1041 1042 const char * 1043 stypeof(const char *ttyid) 1044 { 1045 struct ttyent *t; 1046 1047 return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : NULL); 1048 } 1049 1050 void 1051 sleepexit(int eval) 1052 { 1053 1054 (void)sleep(5); 1055 exit(eval); 1056 } 1057 1058 void 1059 decode_ss(const char *arg) 1060 { 1061 struct sockaddr_storage *ssp; 1062 size_t len = strlen(arg); 1063 1064 if (len > sizeof(*ssp) * 4 + 1 || len < sizeof(*ssp)) 1065 errx(1, "Bad argument"); 1066 1067 if ((ssp = malloc(len)) == NULL) 1068 err(1, NULL); 1069 1070 if (strunvis((char *)ssp, arg) != sizeof(*ssp)) 1071 errx(1, "Decoding error"); 1072 1073 (void)memcpy(&ss, ssp, sizeof(ss)); 1074 have_ss = 1; 1075 } 1076 1077 void 1078 usage(void) 1079 { 1080 (void)fprintf(stderr, 1081 "Usage: %s [-Ffps] [-a address] [-h hostname] [username]\n", 1082 getprogname()); 1083 exit(1); 1084 } 1085
Indexes created Wed Oct 01 07:09:59 GMT 2025