login.c revision 1.67
1 /* $NetBSD: login.c,v 1.67 2002/07/27 22:58:07 christos 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT( 39 "@(#) Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994\n\ 40 The Regents of the University of California. All rights reserved.\n"); 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)login.c 8.4 (Berkeley) 4/2/94"; 46 #endif 47 __RCSID("$NetBSD: login.c,v 1.67 2002/07/27 22:58:07 christos Exp $"); 48 #endif /* not lint */ 49 50 /* 51 * login [ name ] 52 * login -h hostname (for telnetd, etc.) 53 * login -f name (for pre-authenticated login: datakit, xterm, etc.) 54 */ 55 56 #include <sys/param.h> 57 #include <sys/stat.h> 58 #include <sys/time.h> 59 #include <sys/resource.h> 60 #include <sys/file.h> 61 #include <sys/wait.h> 62 #include <sys/socket.h> 63 64 #include <err.h> 65 #include <errno.h> 66 #include <grp.h> 67 #include <pwd.h> 68 #include <setjmp.h> 69 #include <signal.h> 70 #include <stdio.h> 71 #include <stdlib.h> 72 #include <string.h> 73 #include <syslog.h> 74 #include <time.h> 75 #include <ttyent.h> 76 #include <tzfile.h> 77 #include <unistd.h> 78 #ifdef SUPPORT_UTMP 79 #include <utmp.h> 80 #endif 81 #ifdef SUPPORT_UTMPX 82 #include <utmpx.h> 83 #endif 84 #include <util.h> 85 #ifdef SKEY 86 #include <skey.h> 87 #endif 88 #ifdef KERBEROS5 89 #include <krb5/krb5.h> 90 #include <com_err.h> 91 #endif 92 #ifdef LOGIN_CAP 93 #include <login_cap.h> 94 #endif 95 96 #include "pathnames.h" 97 98 #ifdef KERBEROS5 99 int login_krb5_get_tickets = 1; 100 int login_krb4_get_tickets = 0; 101 int login_krb5_forwardable_tgt = 0; 102 int login_krb5_retain_ccache = 0; 103 #endif 104 105 void badlogin __P((char *)); 106 void checknologin __P((char *)); 107 #ifdef SUPPORT_UTMP 108 static void doutmp __P((void)); 109 static void dolastlog __P((int)); 110 #endif 111 #ifdef SUPPORT_UTMPX 112 static void doutmpx __P((void)); 113 static void dolastlogx __P((int)); 114 #endif 115 static void update_db __P((int)); 116 void getloginname __P((void)); 117 int main __P((int, char *[])); 118 void motd __P((char *)); 119 int rootterm __P((char *)); 120 void sigint __P((int)); 121 void sleepexit __P((int)); 122 const char *stypeof __P((const char *)); 123 void timedout __P((int)); 124 #if defined(KERBEROS) 125 int klogin __P((struct passwd *, char *, char *, char *)); 126 void kdestroy __P((void)); 127 #endif 128 #ifdef KERBEROS5 129 int k5login __P((struct passwd *, char *, char *, char *)); 130 void k5destroy __P((void)); 131 int k5_read_creds __P((char*)); 132 int k5_write_creds __P((void)); 133 #endif 134 #if defined(KERBEROS) || defined(KERBEROS5) 135 void dofork __P((void)); 136 #endif 137 138 #define TTYGRPNAME "tty" /* name of group to own ttys */ 139 140 #define DEFAULT_BACKOFF 3 141 #define DEFAULT_RETRIES 10 142 143 /* 144 * This bounds the time given to login. Not a define so it can 145 * be patched on machines where it's too small. 146 */ 147 u_int timeout = 300; 148 149 #if defined(KERBEROS) || defined(KERBEROS5) 150 int notickets = 1; 151 char *instance; 152 int has_ccache = 0; 153 #endif 154 #ifdef KERBEROS 155 extern char *krbtkfile_env; 156 extern int krb_configured; 157 #endif 158 #ifdef KERBEROS5 159 extern krb5_context kcontext; 160 extern int have_forward; 161 extern char *krb5tkfile_env; 162 extern int krb5_configured; 163 #endif 164 165 #if defined(KERBEROS) && defined(KERBEROS5) 166 #define KERBEROS_CONFIGURED (krb_configured || krb5_configured) 167 #elif defined(KERBEROS) 168 #define KERBEROS_CONFIGURED krb_configured 169 #elif defined(KERBEROS5) 170 #define KERBEROS_CONFIGURED krb5_configured 171 #endif 172 173 struct passwd *pwd; 174 int failures; 175 char term[64], *envinit[1], *hostname, *username, *tty; 176 struct timeval now; 177 struct sockaddr_storage ss; 178 179 static const char copyrightstr[] = "\ 180 Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002\n\ 181 \tThe NetBSD Foundation, Inc. All rights reserved.\n\ 182 Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994\n\ 183 \tThe Regents of the University of California. All rights reserved.\n\n"; 184 185 int 186 main(argc, argv) 187 int argc; 188 char *argv[]; 189 { 190 extern char **environ; 191 struct group *gr; 192 struct stat st; 193 int ask, ch, cnt, fflag, hflag, pflag, sflag, quietlog, rootlogin, rval; 194 int Fflag; 195 uid_t uid, saved_uid; 196 gid_t saved_gid, saved_gids[NGROUPS_MAX]; 197 int nsaved_gids; 198 char *domain, *p, *ttyn, *pwprompt; 199 const char *salt; 200 char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10]; 201 char localhost[MAXHOSTNAMELEN + 1]; 202 int need_chpass, require_chpass; 203 int login_retries = DEFAULT_RETRIES, 204 login_backoff = DEFAULT_BACKOFF; 205 time_t pw_warntime = _PASSWORD_WARNDAYS * SECSPERDAY; 206 #ifdef KERBEROS5 207 krb5_error_code kerror; 208 #endif 209 #if defined(KERBEROS) || defined(KERBEROS5) 210 int got_tickets = 0; 211 #endif 212 #ifdef LOGIN_CAP 213 char *shell = NULL; 214 login_cap_t *lc = NULL; 215 #endif 216 217 tbuf[0] = '\0'; 218 rval = 0; 219 pwprompt = NULL; 220 need_chpass = require_chpass = 0; 221 222 (void)signal(SIGALRM, timedout); 223 (void)alarm(timeout); 224 (void)signal(SIGQUIT, SIG_IGN); 225 (void)signal(SIGINT, SIG_IGN); 226 (void)setpriority(PRIO_PROCESS, 0, 0); 227 228 openlog("login", 0, LOG_AUTH); 229 230 /* 231 * -p is used by getty to tell login not to destroy the environment 232 * -f is used to skip a second login authentication 233 * -h is used by other servers to pass the name of the remote host to 234 * login so that it may be placed in utmp/utmpx and wtmp/wtmpx 235 * -s is used to force use of S/Key or equivalent. 236 */ 237 domain = NULL; 238 if (gethostname(localhost, sizeof(localhost)) < 0) 239 syslog(LOG_ERR, "couldn't get local hostname: %m"); 240 else 241 domain = strchr(localhost, '.'); 242 localhost[sizeof(localhost) - 1] = '\0'; 243 244 Fflag = fflag = hflag = pflag = sflag = 0; 245 #ifdef KERBEROS5 246 have_forward = 0; 247 #endif 248 uid = getuid(); 249 while ((ch = getopt(argc, argv, "Ffh:ps")) != -1) 250 switch (ch) { 251 case 'F': 252 Fflag = 1; 253 /* FALLTHROUGH */ 254 case 'f': 255 fflag = 1; 256 break; 257 case 'h': 258 if (uid) 259 errx(1, "-h option: %s", strerror(EPERM)); 260 hflag = 1; 261 if (domain && (p = strchr(optarg, '.')) != NULL && 262 strcasecmp(p, domain) == 0) 263 *p = 0; 264 hostname = optarg; 265 break; 266 case 'p': 267 pflag = 1; 268 break; 269 case 's': 270 sflag = 1; 271 break; 272 default: 273 case '?': 274 (void)fprintf(stderr, 275 "usage: login [-fps] [-h hostname] [username]\n"); 276 exit(1); 277 } 278 argc -= optind; 279 argv += optind; 280 281 if (*argv) { 282 username = *argv; 283 ask = 0; 284 } else 285 ask = 1; 286 287 for (cnt = getdtablesize(); cnt > 2; cnt--) 288 (void)close(cnt); 289 290 ttyn = ttyname(STDIN_FILENO); 291 if (ttyn == NULL || *ttyn == '\0') { 292 (void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY); 293 ttyn = tname; 294 } 295 if ((tty = strrchr(ttyn, '/')) != NULL) 296 ++tty; 297 else 298 tty = ttyn; 299 300 #ifdef LOGIN_CAP 301 /* Get "login-retries" and "login-backoff" from default class */ 302 if ((lc = login_getclass(NULL)) != NULL) { 303 login_retries = (int)login_getcapnum(lc, "login-retries", 304 DEFAULT_RETRIES, DEFAULT_RETRIES); 305 login_backoff = (int)login_getcapnum(lc, "login-backoff", 306 DEFAULT_BACKOFF, DEFAULT_BACKOFF); 307 login_close(lc); 308 lc = NULL; 309 } 310 #endif 311 312 #ifdef KERBEROS5 313 kerror = krb5_init_context(&kcontext); 314 if (kerror) { 315 /* 316 * If Kerberos is not configured, that is, we are 317 * not using Kerberos, do not log the error message. 318 * However, if Kerberos is configured, and the 319 * context init fails for some other reason, we need 320 * to issue a no tickets warning to the user when the 321 * login succeeds. 322 */ 323 if (kerror != ENXIO) { /* XXX NetBSD-local Heimdal hack */ 324 syslog(LOG_NOTICE, 325 "%s when initializing Kerberos context", 326 error_message(kerror)); 327 krb5_configured = 1; 328 } 329 login_krb5_get_tickets = 0; 330 } 331 #endif /* KERBEROS5 */ 332 333 for (cnt = 0;; ask = 1) { 334 #if defined(KERBEROS) 335 kdestroy(); 336 #endif 337 #if defined(KERBEROS5) 338 if (login_krb5_get_tickets) 339 k5destroy(); 340 #endif 341 if (ask) { 342 fflag = 0; 343 getloginname(); 344 } 345 rootlogin = 0; 346 #ifdef KERBEROS 347 if ((instance = strchr(username, '.')) != NULL) 348 *instance++ = '\0'; 349 else 350 instance = ""; 351 #endif 352 #ifdef KERBEROS5 353 if ((instance = strchr(username, '/')) != NULL) 354 *instance++ = '\0'; 355 else 356 instance = ""; 357 #endif 358 if (strlen(username) > MAXLOGNAME) 359 username[MAXLOGNAME] = '\0'; 360 361 /* 362 * Note if trying multiple user names; log failures for 363 * previous user name, but don't bother logging one failure 364 * for nonexistent name (mistyped username). 365 */ 366 if (failures && strcmp(tbuf, username)) { 367 if (failures > (pwd ? 0 : 1)) 368 badlogin(tbuf); 369 failures = 0; 370 } 371 (void)strncpy(tbuf, username, sizeof(tbuf) - 1); 372 tbuf[sizeof(tbuf) - 1] = '\0'; 373 374 if ((pwd = getpwnam(username)) != NULL) 375 salt = pwd->pw_passwd; 376 else 377 salt = "xx"; 378 379 #ifdef LOGIN_CAP 380 /* 381 * Establish the class now, before we might goto 382 * within the next block. pwd can be NULL since it 383 * falls back to the "default" class if it is. 384 */ 385 lc = login_getclass(pwd ? pwd->pw_class : NULL); 386 #endif 387 /* 388 * if we have a valid account name, and it doesn't have a 389 * password, or the -f option was specified and the caller 390 * is root or the caller isn't changing their uid, don't 391 * authenticate. 392 */ 393 if (pwd) { 394 if (pwd->pw_uid == 0) 395 rootlogin = 1; 396 397 if (fflag && (uid == 0 || uid == pwd->pw_uid)) { 398 /* already authenticated */ 399 #ifdef KERBEROS5 400 if (login_krb5_get_tickets && Fflag) 401 k5_read_creds(username); 402 #endif 403 break; 404 } else if (pwd->pw_passwd[0] == '\0') { 405 /* pretend password okay */ 406 rval = 0; 407 goto ttycheck; 408 } 409 } 410 411 fflag = 0; 412 413 (void)setpriority(PRIO_PROCESS, 0, -4); 414 415 #ifdef SKEY 416 if (skey_haskey(username) == 0) { 417 static char skprompt[80]; 418 const char *skinfo = skey_keyinfo(username); 419 420 (void)snprintf(skprompt, sizeof(skprompt)-1, 421 "Password [%s]:", 422 skinfo ? skinfo : "error getting challenge"); 423 pwprompt = skprompt; 424 } else 425 #endif 426 pwprompt = "Password:"; 427 428 p = getpass(pwprompt); 429 430 if (pwd == NULL) { 431 rval = 1; 432 goto skip; 433 } 434 #ifdef KERBEROS 435 if ( 436 #ifdef KERBEROS5 437 /* allow a user to get both krb4 and krb5 tickets, if 438 * desired. If krb5 is compiled in, the default action 439 * is to ignore krb4 and get krb5 tickets, but the user 440 * can override this in the krb5.conf. */ 441 login_krb4_get_tickets && 442 #endif 443 klogin(pwd, instance, localhost, p) == 0) { 444 rval = 0; 445 got_tickets = 1; 446 } 447 #endif 448 #ifdef KERBEROS5 449 if (login_krb5_get_tickets && 450 k5login(pwd, instance, localhost, p) == 0) { 451 rval = 0; 452 got_tickets = 1; 453 } 454 #endif 455 #if defined(KERBEROS) || defined(KERBEROS5) 456 if (got_tickets) 457 goto skip; 458 #endif 459 #ifdef SKEY 460 if (skey_haskey(username) == 0 && 461 skey_passcheck(username, p) != -1) { 462 rval = 0; 463 goto skip; 464 } 465 #endif 466 if (!sflag && *pwd->pw_passwd != '\0' && 467 !strcmp(crypt(p, pwd->pw_passwd), pwd->pw_passwd)) { 468 rval = 0; 469 require_chpass = 1; 470 goto skip; 471 } 472 rval = 1; 473 474 skip: 475 memset(p, 0, strlen(p)); 476 477 (void)setpriority(PRIO_PROCESS, 0, 0); 478 479 ttycheck: 480 /* 481 * If trying to log in as root without Kerberos, 482 * but with insecure terminal, refuse the login attempt. 483 */ 484 if (pwd && !rval && rootlogin && !rootterm(tty)) { 485 (void)fprintf(stderr, 486 "%s login refused on this terminal.\n", 487 pwd->pw_name); 488 if (hostname) 489 syslog(LOG_NOTICE, 490 "LOGIN %s REFUSED FROM %s ON TTY %s", 491 pwd->pw_name, hostname, tty); 492 else 493 syslog(LOG_NOTICE, 494 "LOGIN %s REFUSED ON TTY %s", 495 pwd->pw_name, tty); 496 continue; 497 } 498 499 if (pwd && !rval) 500 break; 501 502 (void)printf("Login incorrect\n"); 503 failures++; 504 cnt++; 505 /* we allow 10 tries, but after 3 we start backing off */ 506 if (cnt > login_backoff) { 507 if (cnt >= login_retries) { 508 badlogin(username); 509 sleepexit(1); 510 } 511 sleep((u_int)((cnt - 3) * 5)); 512 } 513 } 514 515 /* committed to login -- turn off timeout */ 516 (void)alarm((u_int)0); 517 518 endpwent(); 519 520 /* if user not super-user, check for disabled logins */ 521 #ifdef LOGIN_CAP 522 if (!login_getcapbool(lc, "ignorenologin", rootlogin)) 523 checknologin(login_getcapstr(lc, "nologin", NULL, NULL)); 524 #else 525 if (!rootlogin) 526 checknologin(NULL); 527 #endif 528 529 #ifdef LOGIN_CAP 530 quietlog = login_getcapbool(lc, "hushlogin", 0); 531 #else 532 quietlog = 0; 533 #endif 534 /* Temporarily give up special privileges so we can change */ 535 /* into NFS-mounted homes that are exported for non-root */ 536 /* access and have mode 7x0 */ 537 saved_uid = geteuid(); 538 saved_gid = getegid(); 539 nsaved_gids = getgroups(NGROUPS_MAX, saved_gids); 540 541 (void)setegid(pwd->pw_gid); 542 initgroups(username, pwd->pw_gid); 543 (void)seteuid(pwd->pw_uid); 544 545 if (chdir(pwd->pw_dir) < 0) { 546 #ifdef LOGIN_CAP 547 if (login_getcapbool(lc, "requirehome", 0)) { 548 (void)printf("Home directory %s required\n", 549 pwd->pw_dir); 550 sleepexit(1); 551 } 552 #endif 553 (void)printf("No home directory %s!\n", pwd->pw_dir); 554 if (chdir("/")) 555 exit(0); 556 pwd->pw_dir = "/"; 557 (void)printf("Logging in with home = \"/\".\n"); 558 } 559 560 if (!quietlog) 561 quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0; 562 563 /* regain special privileges */ 564 (void)seteuid(saved_uid); 565 setgroups(nsaved_gids, saved_gids); 566 (void)setegid(saved_gid); 567 568 #ifdef LOGIN_CAP 569 pw_warntime = login_getcaptime(lc, "password-warn", 570 _PASSWORD_WARNDAYS * SECSPERDAY, 571 _PASSWORD_WARNDAYS * SECSPERDAY); 572 #endif 573 574 (void)gettimeofday(&now, (struct timezone *)NULL); 575 if (pwd->pw_expire) { 576 if (now.tv_sec >= pwd->pw_expire) { 577 (void)printf("Sorry -- your account has expired.\n"); 578 sleepexit(1); 579 } else if (pwd->pw_expire - now.tv_sec < pw_warntime && 580 !quietlog) 581 (void)printf("Warning: your account expires on %s", 582 ctime(&pwd->pw_expire)); 583 } 584 if (pwd->pw_change) { 585 if (pwd->pw_change == _PASSWORD_CHGNOW) 586 need_chpass = 1; 587 else if (now.tv_sec >= pwd->pw_change) { 588 (void)printf("Sorry -- your password has expired.\n"); 589 sleepexit(1); 590 } else if (pwd->pw_change - now.tv_sec < pw_warntime && 591 !quietlog) 592 (void)printf("Warning: your password expires on %s", 593 ctime(&pwd->pw_change)); 594 595 } 596 /* Nothing else left to fail -- really log in. */ 597 update_db(quietlog); 598 599 (void)chown(ttyn, pwd->pw_uid, 600 (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid); 601 602 if (ttyaction(ttyn, "login", pwd->pw_name)) 603 (void)printf("Warning: ttyaction failed.\n"); 604 605 #if defined(KERBEROS) || defined(KERBEROS5) 606 /* Fork so that we can call kdestroy */ 607 if ( 608 #ifdef KERBEROS5 609 ! login_krb5_retain_ccache && 610 #endif 611 has_ccache) 612 dofork(); 613 #endif 614 615 /* Destroy environment unless user has requested its preservation. */ 616 if (!pflag) 617 environ = envinit; 618 619 #ifdef LOGIN_CAP 620 if (setusercontext(lc, pwd, pwd->pw_uid, 621 LOGIN_SETALL & ~LOGIN_SETPATH) != 0) { 622 syslog(LOG_ERR, "setusercontext failed"); 623 exit(1); 624 } 625 #else 626 (void)setgid(pwd->pw_gid); 627 628 initgroups(username, pwd->pw_gid); 629 630 if (setlogin(pwd->pw_name) < 0) 631 syslog(LOG_ERR, "setlogin() failure: %m"); 632 633 /* Discard permissions last so can't get killed and drop core. */ 634 if (rootlogin) 635 (void)setuid(0); 636 else 637 (void)setuid(pwd->pw_uid); 638 #endif 639 640 if (*pwd->pw_shell == '\0') 641 pwd->pw_shell = _PATH_BSHELL; 642 #ifdef LOGIN_CAP 643 if ((shell = login_getcapstr(lc, "shell", NULL, NULL)) != NULL) { 644 if ((shell = strdup(shell)) == NULL) { 645 syslog(LOG_ERR, "Cannot alloc mem"); 646 sleepexit(1); 647 } 648 pwd->pw_shell = shell; 649 } 650 #endif 651 652 (void)setenv("HOME", pwd->pw_dir, 1); 653 (void)setenv("SHELL", pwd->pw_shell, 1); 654 if (term[0] == '\0') { 655 char *tt = (char *)stypeof(tty); 656 #ifdef LOGIN_CAP 657 if (tt == NULL) 658 tt = login_getcapstr(lc, "term", NULL, NULL); 659 #endif 660 /* unknown term -> "su" */ 661 (void)strncpy(term, tt != NULL ? tt : "su", sizeof(term)); 662 } 663 (void)setenv("TERM", term, 0); 664 (void)setenv("LOGNAME", pwd->pw_name, 1); 665 (void)setenv("USER", pwd->pw_name, 1); 666 667 #ifdef LOGIN_CAP 668 setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETPATH); 669 #else 670 (void)setenv("PATH", _PATH_DEFPATH, 0); 671 #endif 672 673 #ifdef KERBEROS 674 if (krbtkfile_env) 675 (void)setenv("KRBTKFILE", krbtkfile_env, 1); 676 #endif 677 #ifdef KERBEROS5 678 if (krb5tkfile_env) 679 (void)setenv("KRB5CCNAME", krb5tkfile_env, 1); 680 #endif 681 682 if (tty[sizeof("tty")-1] == 'd') 683 syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name); 684 685 /* If fflag is on, assume caller/authenticator has logged root login. */ 686 if (rootlogin && fflag == 0) { 687 if (hostname) 688 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s", 689 username, tty, hostname); 690 else 691 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", 692 username, tty); 693 } 694 695 #if defined(KERBEROS) || defined(KERBEROS5) 696 if (KERBEROS_CONFIGURED && !quietlog && notickets == 1) 697 (void)printf("Warning: no Kerberos tickets issued.\n"); 698 #endif 699 700 if (!quietlog) { 701 char *fname; 702 #ifdef LOGIN_CAP 703 fname = login_getcapstr(lc, "copyright", NULL, NULL); 704 if (fname != NULL && access(fname, F_OK) == 0) 705 motd(fname); 706 else 707 #endif 708 (void)printf(copyrightstr); 709 710 #ifdef LOGIN_CAP 711 fname = login_getcapstr(lc, "welcome", NULL, NULL); 712 if (fname == NULL || access(fname, F_OK) != 0) 713 #endif 714 fname = _PATH_MOTDFILE; 715 motd(fname); 716 717 (void)snprintf(tbuf, 718 sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pwd->pw_name); 719 if (stat(tbuf, &st) == 0 && st.st_size != 0) 720 (void)printf("You have %smail.\n", 721 (st.st_mtime > st.st_atime) ? "new " : ""); 722 } 723 724 #ifdef LOGIN_CAP 725 login_close(lc); 726 #endif 727 728 (void)signal(SIGALRM, SIG_DFL); 729 (void)signal(SIGQUIT, SIG_DFL); 730 (void)signal(SIGINT, SIG_DFL); 731 (void)signal(SIGTSTP, SIG_IGN); 732 733 tbuf[0] = '-'; 734 (void)strncpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ? 735 p + 1 : pwd->pw_shell, sizeof(tbuf) - 2); 736 737 /* Wait to change password until we're unprivileged */ 738 if (need_chpass) { 739 if (!require_chpass) 740 (void)printf( 741 "Warning: your password has expired. Please change it as soon as possible.\n"); 742 else { 743 int status; 744 745 (void)printf( 746 "Your password has expired. Please choose a new one.\n"); 747 switch (fork()) { 748 case -1: 749 warn("fork"); 750 sleepexit(1); 751 case 0: 752 execl(_PATH_BINPASSWD, "passwd", 0); 753 _exit(1); 754 default: 755 if (wait(&status) == -1 || 756 WEXITSTATUS(status)) 757 sleepexit(1); 758 } 759 } 760 } 761 762 #ifdef KERBEROS5 763 if (login_krb5_get_tickets) 764 k5_write_creds(); 765 #endif 766 execlp(pwd->pw_shell, tbuf, 0); 767 err(1, "%s", pwd->pw_shell); 768 } 769 770 #if defined(KERBEROS) || defined(KERBEROS5) 771 #define NBUFSIZ (MAXLOGNAME + 1 + 5) /* .root suffix */ 772 #else 773 #define NBUFSIZ (MAXLOGNAME + 1) 774 #endif 775 776 #if defined(KERBEROS) || defined(KERBEROS5) 777 /* 778 * This routine handles cleanup stuff, and the like. 779 * It exists only in the child process. 780 */ 781 #include <sys/wait.h> 782 void 783 dofork() 784 { 785 int child; 786 787 if (!(child = fork())) 788 return; /* Child process */ 789 790 /* 791 * Setup stuff? This would be things we could do in parallel 792 * with login 793 */ 794 (void)chdir("/"); /* Let's not keep the fs busy... */ 795 796 /* If we're the parent, watch the child until it dies */ 797 while (wait(0) != child) 798 ; 799 800 /* Cleanup stuff */ 801 /* Run kdestroy to destroy tickets */ 802 #ifdef KERBEROS 803 kdestroy(); 804 #endif 805 #ifdef KERBEROS5 806 if (login_krb5_get_tickets) 807 k5destroy(); 808 #endif 809 810 /* Leave */ 811 exit(0); 812 } 813 #endif 814 815 void 816 getloginname() 817 { 818 int ch; 819 char *p; 820 static char nbuf[NBUFSIZ]; 821 822 for (;;) { 823 (void)printf("login: "); 824 for (p = nbuf; (ch = getchar()) != '\n'; ) { 825 if (ch == EOF) { 826 badlogin(username); 827 exit(0); 828 } 829 if (p < nbuf + (NBUFSIZ - 1)) 830 *p++ = ch; 831 } 832 if (p > nbuf) { 833 if (nbuf[0] == '-') 834 (void)fprintf(stderr, 835 "login names may not start with '-'.\n"); 836 else { 837 *p = '\0'; 838 username = nbuf; 839 break; 840 } 841 } 842 } 843 } 844 845 int 846 rootterm(ttyn) 847 char *ttyn; 848 { 849 struct ttyent *t; 850 851 return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE); 852 } 853 854 jmp_buf motdinterrupt; 855 856 void 857 motd(fname) 858 char *fname; 859 { 860 int fd, nchars; 861 sig_t oldint; 862 char tbuf[8192]; 863 864 if ((fd = open(fname ? fname : _PATH_MOTDFILE, O_RDONLY, 0)) < 0) 865 return; 866 oldint = signal(SIGINT, sigint); 867 if (setjmp(motdinterrupt) == 0) 868 while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0) 869 (void)write(fileno(stdout), tbuf, nchars); 870 (void)signal(SIGINT, oldint); 871 (void)close(fd); 872 } 873 874 /* ARGSUSED */ 875 void 876 sigint(signo) 877 int signo; 878 { 879 880 longjmp(motdinterrupt, 1); 881 } 882 883 /* ARGSUSED */ 884 void 885 timedout(signo) 886 int signo; 887 { 888 889 (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout); 890 exit(0); 891 } 892 893 void 894 checknologin(fname) 895 char *fname; 896 { 897 int fd, nchars; 898 char tbuf[8192]; 899 900 if ((fd = open(fname ? fname : _PATH_NOLOGIN, O_RDONLY, 0)) >= 0) { 901 while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0) 902 (void)write(fileno(stdout), tbuf, nchars); 903 sleepexit(0); 904 } 905 } 906 907 static void 908 update_db(int quietlog) 909 { 910 if (hostname != NULL) { 911 socklen_t len = sizeof(ss); 912 (void)getpeername(STDIN_FILENO, (struct sockaddr *)&ss, &len); 913 } 914 printf("from host %s\n", hostname); 915 (void)gettimeofday(&now, NULL); 916 #ifdef SUPPORT_UTMPX 917 doutmpx(); 918 dolastlogx(quietlog); 919 quietlog = 1; 920 #endif 921 #ifdef SUPPORT_UTMP 922 doutmp(); 923 dolastlog(quietlog); 924 #endif 925 } 926 927 #ifdef SUPPORT_UTMPX 928 static void 929 doutmpx() 930 { 931 struct utmpx utmpx; 932 char *t; 933 934 memset((void *)&utmpx, 0, sizeof(utmpx)); 935 utmpx.ut_tv = now; 936 (void)strncpy(utmpx.ut_name, username, sizeof(utmpx.ut_name)); 937 if (hostname) { 938 (void)strncpy(utmpx.ut_host, hostname, sizeof(utmpx.ut_host)); 939 utmpx.ut_ss = ss; 940 } 941 (void)strncpy(utmpx.ut_line, tty, sizeof(utmpx.ut_line)); 942 utmpx.ut_type = USER_PROCESS; 943 utmpx.ut_pid = getpid(); 944 t = tty + strlen(tty); 945 if (t - tty >= sizeof(utmpx.ut_id)) { 946 (void)strncpy(utmpx.ut_id, t - sizeof(utmpx.ut_id), 947 sizeof(utmpx.ut_id)); 948 } else { 949 (void)strncpy(utmpx.ut_id, tty, sizeof(utmpx.ut_id)); 950 } 951 if (pututxline(&utmpx) == NULL) 952 syslog(LOG_NOTICE, "Cannot update utmpx %m"); 953 endutxent(); 954 if (updwtmpx(_PATH_WTMPX, &utmpx) != 0) 955 syslog(LOG_NOTICE, "Cannot update wtmpx %m"); 956 } 957 958 static void 959 dolastlogx(quiet) 960 int quiet; 961 { 962 struct lastlogx ll; 963 if (getlastlogx(pwd->pw_uid, &ll) != NULL) { 964 time_t t = (time_t)ll.ll_tv.tv_sec; 965 (void)printf("Last login: %.24s ", ctime(&t)); 966 if (*ll.ll_host != '\0') 967 (void)printf("from %.*s ", 968 (int)sizeof(ll.ll_host), 969 ll.ll_host); 970 (void)printf("on %.*s\n", 971 (int)sizeof(ll.ll_line), 972 ll.ll_line); 973 } 974 ll.ll_tv = now; 975 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 976 if (hostname) { 977 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 978 ll.ll_ss = ss; 979 } 980 if (updlastlogx(_PATH_LASTLOGX, pwd->pw_uid, &ll) != 0) 981 syslog(LOG_NOTICE, "Cannot update lastlogx %m"); 982 } 983 #endif 984 985 #ifdef SUPPORT_UTMP 986 static void 987 doutmp() 988 { 989 struct utmp utmp; 990 991 (void)memset((void *)&utmp, 0, sizeof(utmp)); 992 utmp.ut_time = now.tv_sec; 993 (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name)); 994 if (hostname) 995 (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host)); 996 (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line)); 997 login(&utmp); 998 } 999 1000 static void 1001 dolastlog(quiet) 1002 int quiet; 1003 { 1004 struct lastlog ll; 1005 int fd; 1006 1007 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) { 1008 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), SEEK_SET); 1009 if (!quiet) { 1010 if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) && 1011 ll.ll_time != 0) { 1012 (void)printf("Last login: %.24s ", 1013 ctime(&ll.ll_time)); 1014 if (*ll.ll_host != '\0') 1015 (void)printf("from %.*s ", 1016 (int)sizeof(ll.ll_host), 1017 ll.ll_host); 1018 (void)printf("on %.*s\n", 1019 (int)sizeof(ll.ll_line), ll.ll_line); 1020 } 1021 (void)lseek(fd, (off_t)(pwd->pw_uid * sizeof(ll)), 1022 SEEK_SET); 1023 } 1024 memset((void *)&ll, 0, sizeof(ll)); 1025 ll.ll_time = now.tv_sec; 1026 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 1027 if (hostname) 1028 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 1029 (void)write(fd, (char *)&ll, sizeof(ll)); 1030 (void)close(fd); 1031 } 1032 } 1033 #endif 1034 1035 void 1036 badlogin(name) 1037 char *name; 1038 { 1039 1040 if (failures == 0) 1041 return; 1042 if (hostname) { 1043 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s", 1044 failures, failures > 1 ? "S" : "", hostname); 1045 syslog(LOG_AUTHPRIV|LOG_NOTICE, 1046 "%d LOGIN FAILURE%s FROM %s, %s", 1047 failures, failures > 1 ? "S" : "", hostname, name); 1048 } else { 1049 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s", 1050 failures, failures > 1 ? "S" : "", tty); 1051 syslog(LOG_AUTHPRIV|LOG_NOTICE, 1052 "%d LOGIN FAILURE%s ON %s, %s", 1053 failures, failures > 1 ? "S" : "", tty, name); 1054 } 1055 } 1056 1057 const char * 1058 stypeof(ttyid) 1059 const char *ttyid; 1060 { 1061 struct ttyent *t; 1062 1063 return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : NULL); 1064 } 1065 1066 void 1067 sleepexit(eval) 1068 int eval; 1069 { 1070 1071 (void)sleep(5); 1072 exit(eval); 1073 } 1074
Indexes created Tue Sep 30 20:09:53 GMT 2025