1 /*- 2 * Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994 3 * The Regents of the University of California. 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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if 0 35 static char copyright[] = 36 "@(#) Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif 39 40 #ifndef lint 41 static char sccsid[] = "@(#)login.c 8.4 (Berkeley) 4/2/94"; 42 #endif /* not lint */ 43 44 /* 45 * login [ name ] 46 * login -h hostname (for telnetd, etc.) 47 * login -f name (for pre-authenticated login: datakit, xterm, etc.) 48 */ 49 50 #include <sys/copyright.h> 51 #include <sys/param.h> 52 #include <sys/stat.h> 53 #include <sys/time.h> 54 #include <sys/resource.h> 55 #include <sys/file.h> 56 #include <netinet/in.h> 57 #include <arpa/inet.h> 58 59 #include <err.h> 60 #include <errno.h> 61 #include <grp.h> 62 #include <netdb.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 <ttyent.h> 71 #include <unistd.h> 72 #include <utmp.h> 73 74 #ifdef LOGIN_CAP 75 #include <login_cap.h> 76 #else /* Undef AUTH as well */ 77 #undef LOGIN_CAP_AUTH 78 #endif 79 80 /* 81 * If LOGIN_CAP_AUTH is activated: 82 * kerberose & skey logins are runtime selected via login 83 * login_getstyle() and authentication types for login classes 84 * The actual login itself is handled via /usr/libexec/login_<style> 85 * Valid styles are determined by the auth-type=style,style entries 86 * in the login class. 87 */ 88 #ifdef LOGIN_CAP_AUTH 89 #undef KERBEROS 90 #undef SKEY 91 #endif /* LOGIN_CAP_AUTH */ 92 93 #ifdef SKEY 94 #include <skey.h> 95 #endif /* SKEY */ 96 97 #include "pathnames.h" 98 99 void badlogin __P((char *)); 100 void checknologin __P((void)); 101 void dolastlog __P((int)); 102 void getloginname __P((void)); 103 void motd __P((char *)); 104 int rootterm __P((char *)); 105 void sigint __P((int)); 106 void sleepexit __P((int)); 107 void refused __P((char *,char *,int)); 108 char *stypeof __P((char *)); 109 void timedout __P((int)); 110 void login_fbtab __P((char *, uid_t, gid_t)); 111 #ifdef KERBEROS 112 int klogin __P((struct passwd *, char *, char *, char *)); 113 #endif 114 115 extern void login __P((struct utmp *)); 116 117 #define TTYGRPNAME "tty" /* name of group to own ttys */ 118 #define DEFAULT_BACKOFF 3 119 #define DEFAULT_RETRIES 10 120 121 /* 122 * This bounds the time given to login. Not a define so it can 123 * be patched on machines where it's too small. 124 */ 125 u_int timeout = 300; 126 127 #ifdef KERBEROS 128 int notickets = 1; 129 int noticketsdontcomplain = 1; 130 char *instance; 131 char *krbtkfile_env; 132 int authok; 133 #endif 134 135 struct passwd *pwd; 136 int failures; 137 char *term, *envinit[1], *hostname, *username, *tty; 138 char full_hostname[MAXHOSTNAMELEN]; 139 140 int 141 main(argc, argv) 142 int argc; 143 char *argv[]; 144 { 145 extern char **environ; 146 struct group *gr; 147 struct stat st; 148 struct timeval tp; 149 struct utmp utmp; 150 int rootok, retries, backoff; 151 int ask, ch, cnt, fflag, hflag, pflag, quietlog, rootlogin, rval; 152 int changepass; 153 time_t warntime; 154 uid_t uid; 155 char *domain, *p, *ep, *salt, *ttyn; 156 char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10]; 157 char localhost[MAXHOSTNAMELEN]; 158 char *shell = NULL; 159 #ifdef LOGIN_CAP 160 login_cap_t *lc = NULL; 161 #ifdef LOGIN_CAP_AUTH 162 char *style, *authtype; 163 char *auth_method = NULL; 164 char *instance = NULL; 165 int authok; 166 #endif /* LOGIN_CAP_AUTH */ 167 #endif /* LOGIN_CAP */ 168 #ifdef SKEY 169 int permit_passwd = 0; 170 #endif /* SKEY */ 171 172 (void)signal(SIGALRM, timedout); 173 (void)alarm(timeout); 174 (void)signal(SIGQUIT, SIG_IGN); 175 (void)signal(SIGINT, SIG_IGN); 176 (void)setpriority(PRIO_PROCESS, 0, 0); 177 178 openlog("login", LOG_ODELAY, LOG_AUTH); 179 180 /* 181 * -p is used by getty to tell login not to destroy the environment 182 * -f is used to skip a second login authentication 183 * -h is used by other servers to pass the name of the remote 184 * host to login so that it may be placed in utmp and wtmp 185 */ 186 *full_hostname = '\0'; 187 domain = NULL; 188 term = NULL; 189 if (gethostname(localhost, sizeof(localhost)) < 0) 190 syslog(LOG_ERR, "couldn't get local hostname: %m"); 191 else 192 domain = strchr(localhost, '.'); 193 194 fflag = hflag = pflag = 0; 195 uid = getuid(); 196 while ((ch = getopt(argc, argv, "fh:p")) != EOF) 197 switch (ch) { 198 case 'f': 199 fflag = 1; 200 break; 201 case 'h': 202 if (uid) 203 errx(1, "-h option: %s", strerror(EPERM)); 204 hflag = 1; 205 strncpy(full_hostname, optarg, sizeof(full_hostname)-1); 206 if (domain && (p = strchr(optarg, '.')) && 207 strcasecmp(p, domain) == 0) 208 *p = 0; 209 if (strlen(optarg) > UT_HOSTSIZE) { 210 struct hostent *hp = gethostbyname(optarg); 211 212 if (hp != NULL) { 213 struct in_addr in; 214 215 memmove(&in, hp->h_addr, sizeof(in)); 216 optarg = strdup(inet_ntoa(in)); 217 } else 218 optarg = "invalid hostname"; 219 } 220 hostname = optarg; 221 break; 222 case 'p': 223 pflag = 1; 224 break; 225 case '?': 226 default: 227 if (!uid) 228 syslog(LOG_ERR, "invalid flag %c", ch); 229 (void)fprintf(stderr, 230 "usage: login [-fp] [-h hostname] [username]\n"); 231 exit(1); 232 } 233 argc -= optind; 234 argv += optind; 235 236 if (*argv) { 237 username = *argv; 238 ask = 0; 239 } else 240 ask = 1; 241 242 for (cnt = getdtablesize(); cnt > 2; cnt--) 243 (void)close(cnt); 244 245 ttyn = ttyname(STDIN_FILENO); 246 if (ttyn == NULL || *ttyn == '\0') { 247 (void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY); 248 ttyn = tname; 249 } 250 if ((tty = strrchr(ttyn, '/')) != NULL) 251 ++tty; 252 else 253 tty = ttyn; 254 255 #ifdef LOGIN_CAP_AUTH 256 authtype = hostname ? "rlogin" : "login"; 257 #endif 258 #ifdef LOGIN_CAP 259 /* 260 * Get "login-retries" & "login-backoff" from default class 261 */ 262 lc = login_getclass(NULL); 263 retries = login_getcapnum(lc, "login-retries", DEFAULT_RETRIES, DEFAULT_RETRIES); 264 backoff = login_getcapnum(lc, "login-backoff", DEFAULT_BACKOFF, DEFAULT_BACKOFF); 265 login_close(lc); 266 lc = NULL; 267 #else 268 retries = DEFAULT_RETRIES; 269 backoff = DEFAULT_BACKOFF; 270 #endif 271 272 for (cnt = 0;; ask = 1) { 273 if (ask) { 274 fflag = 0; 275 getloginname(); 276 } 277 rootlogin = 0; 278 rootok = rootterm(tty); /* Default (auth may change) */ 279 #ifdef LOGIN_CAP_AUTH 280 authok = 0; 281 if (auth_method = strchr(username, ':')) { 282 *auth_method = '\0'; 283 auth_method++; 284 if (*auth_method == '\0') 285 auth_method = NULL; 286 } 287 /* 288 * We need to do this regardless of whether 289 * kerberos is available. 290 */ 291 if ((instance = strchr(username, '.')) != NULL) { 292 if (strncmp(instance, ".root", 5) == 0) 293 rootlogin = 1; 294 *instance++ = '\0'; 295 } else 296 instance = ""; 297 #else /* !LOGIN_CAP_AUTH */ 298 #ifdef KERBEROS 299 if ((instance = strchr(username, '.')) != NULL) { 300 if (strncmp(instance, ".root", 5) == 0) 301 rootlogin = 1; 302 *instance++ = '\0'; 303 } else 304 instance = ""; 305 #endif /* KERBEROS */ 306 #endif /* LOGIN_CAP_AUTH */ 307 308 if (strlen(username) > UT_NAMESIZE) 309 username[UT_NAMESIZE] = '\0'; 310 311 /* 312 * Note if trying multiple user names; log failures for 313 * previous user name, but don't bother logging one failure 314 * for nonexistent name (mistyped username). 315 */ 316 if (failures && strcmp(tbuf, username)) { 317 if (failures > (pwd ? 0 : 1)) 318 badlogin(tbuf); 319 failures = 0; 320 } 321 (void)strcpy(tbuf, username); 322 323 if ((pwd = getpwnam(username)) != NULL) 324 salt = pwd->pw_passwd; 325 else 326 salt = "xx"; 327 328 #ifdef LOGIN_CAP 329 /* 330 * Establish the class now, before we might goto 331 * within the next block. pwd can be NULL since it 332 * falls back to the "default" class if it is. 333 */ 334 lc = login_getclass(pwd); 335 #endif /* LOGIN_CAP */ 336 337 /* 338 * if we have a valid account name, and it doesn't have a 339 * password, or the -f option was specified and the caller 340 * is root or the caller isn't changing their uid, don't 341 * authenticate. 342 */ 343 rval = 1; 344 if (pwd != NULL) { 345 if (pwd->pw_uid == 0) 346 rootlogin = 1; 347 348 if (fflag && (uid == (uid_t)0 || 349 uid == (uid_t)pwd->pw_uid)) { 350 /* already authenticated */ 351 break; 352 } else if (pwd->pw_passwd[0] == '\0') { 353 if (!rootlogin || rootok) { 354 /* pretend password okay */ 355 rval = 0; 356 goto ttycheck; 357 } 358 } 359 } 360 361 fflag = 0; 362 363 (void)setpriority(PRIO_PROCESS, 0, -4); 364 365 #ifdef LOGIN_CAP_AUTH 366 /* 367 * This hands off authorization to an authorization program, 368 * depending on the styles available for the "auth-login", 369 * auth-rlogin (or default) authorization styles. 370 * We do this regardless of whether an account exists so that 371 * the remote user cannot tell a "real" from an invented 372 * account name. If we don't have an account we just fall 373 * back to the first method for the "default" class. 374 */ 375 if (!(style = login_getstyle(lc, auth_method, authtype))) { 376 377 /* 378 * No available authorization method 379 */ 380 rval = 1; 381 (void)printf("No auth method available for %s.\n", 382 authtype); 383 } else { 384 385 /* 386 * Put back the kerberos instance, if any was given. 387 * Don't worry about the non-kerberos case here, since 388 * if kerberos is not available or not selected and an 389 * instance is given at the login prompt, su or rlogin -l, 390 * then anything else should fail as well. 391 */ 392 if (*instance) 393 *(instance - 1) = '.'; 394 395 rval = authenticate(username, 396 lc ? lc->lc_class : "default", 397 style, authtype); 398 /* Junk it again */ 399 if (*instance) 400 *(instance - 1) = '\0'; 401 } 402 403 if (!rval) { 404 char * approvp; 405 406 /* 407 * If authentication succeeds, run any approval 408 * program, if applicable for this class. 409 */ 410 approvep = login_getcapstr(lc, "approve", NULL, NULL); 411 rval = 1; /* Assume bad login again */ 412 413 if (approvep==NULL || 414 auth_script(approvep, approvep, username, 415 lc->lc_class, 0) == 0) { 416 int r; 417 418 r = auth_scan(AUTH_OKAY); 419 /* 420 * See what the authorize program says 421 */ 422 if (r != AUTH_NONE) { 423 rval = 0; 424 425 if (!rootok && (r & AUTH_ROOTOKAY)) 426 rootok = 1; /* root approved */ 427 else 428 rootlogin = 0; 429 430 if (!authok && (r & AUTH_SECURE)) 431 authok = 1; /* secure */ 432 } 433 } 434 } 435 #else /* !LOGIN_CAP_AUTH */ 436 #ifdef SKEY 437 permit_passwd = skeyaccess(username, tty, 438 hostname ? full_hostname : NULL, 439 NULL); 440 p = skey_getpass("Password:", pwd, permit_passwd); 441 ep = skey_crypt(p, salt, pwd, permit_passwd); 442 #else /* !SKEY */ 443 p = getpass("Password:"); 444 ep = crypt(p, salt); 445 #endif/* SKEY */ 446 447 if (pwd) { 448 #ifdef KERBEROS 449 #ifdef SKEY 450 /* 451 * Do not allow user to type in kerberos password 452 * over the net (actually, this is ok for encrypted 453 * links, but we have no way of determining if the 454 * link is encrypted. 455 */ 456 if (!permit_passwd) { 457 rval = 1; /* failed */ 458 } else 459 #endif /* SKEY */ 460 rval = klogin(pwd, instance, localhost, p); 461 if (rval != 0 && rootlogin && pwd->pw_uid != 0) 462 rootlogin = 0; 463 if (rval == 0) 464 authok = 1; /* kerberos authenticated ok */ 465 else if (rval == 1) /* fallback to unix passwd */ 466 rval = strcmp(ep, pwd->pw_passwd); 467 #else /* !KERBEROS */ 468 rval = strcmp(ep, pwd->pw_passwd); 469 #endif /* KERBEROS */ 470 } 471 472 /* clear entered password */ 473 memset(p, 0, strlen(p)); 474 #endif /* LOGIN_CAP_AUTH */ 475 476 (void)setpriority(PRIO_PROCESS, 0, 0); 477 478 #ifdef LOGIN_CAP 479 if (rval) 480 auth_rmfiles(); 481 #endif 482 ttycheck: 483 /* 484 * If trying to log in as root without Kerberos, 485 * but with insecure terminal, refuse the login attempt. 486 */ 487 if (pwd && !rval) { 488 #if defined(KERBEROS) || defined(LOGIN_CAP_AUTH) 489 if (authok == 0 && rootlogin && !rootok) 490 #else 491 if (rootlogin && !rootok) 492 #endif 493 refused(NULL, "NOROOT", 0); 494 else /* valid password & authenticated */ 495 break; 496 } 497 498 (void)printf("Login incorrect\n"); 499 failures++; 500 501 /* 502 * we allow up to 'retry' (10) tries, 503 * but after 'backoff' (3) we start backing off 504 */ 505 if (++cnt > backoff) { 506 if (cnt >= retries) { 507 badlogin(username); 508 sleepexit(1); 509 } 510 sleep((u_int)((cnt - 3) * 5)); 511 } 512 } 513 514 /* committed to login -- turn off timeout */ 515 (void)alarm((u_int)0); 516 517 endpwent(); 518 519 /* if user not super-user, check for disabled logins */ 520 #ifdef LOGIN_CAP 521 if (!rootlogin) 522 auth_checknologin(lc); 523 #else 524 if (!rootlogin) 525 checknologin(); 526 #endif 527 528 #ifdef LOGIN_CAP 529 quietlog = login_getcapbool(lc, "hushlogin", 0); 530 #else 531 quietlog = 0; 532 #endif 533 if (!*pwd->pw_dir || chdir(pwd->pw_dir) < 0) { 534 #ifdef LOGIN_CAP 535 if (login_getcapbool(lc, "requirehome", !rootlogin)) 536 refused("Home directory not available", "HOMEDIR", 1); 537 #endif 538 if (chdir("/") < 0) { 539 refused("Cannot find root directory", "ROOTDIR", 1); 540 pwd->pw_dir = "/"; 541 if (!quietlog || *pwd->pw_dir) 542 printf("No home directory.\nLogging in with home = \"/\".\n"); 543 } 544 if (!quietlog) 545 quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0; 546 547 if (pwd->pw_change || pwd->pw_expire) 548 (void)gettimeofday(&tp, (struct timezone *)NULL); 549 550 #define DEFAULT_WARN (2L * 7L & 86400L) /* Two weeks */ 551 552 #ifdef LOGIN_CAP 553 warntime = login_getcaptime(lc, "warnpassword", 554 DEFAULT_WARN, DEFAULT_WARN); 555 #else 556 warntime = DEFAULT_WARN; 557 #endif 558 559 changepass=0; 560 if (pwd->pw_change) { 561 if (tp.tv_sec >= pwd->pw_change) { 562 (void)printf("Sorry -- your password has expired.\n"); 563 changepass=1; 564 syslog(LOG_INFO, 565 "%s Password expired - forcing change", 566 pwd->pw_name); 567 } else if (pwd->pw_change - tp.tv_sec < warntime && !quietlog) 568 (void)printf("Warning: your password expires on %s", 569 ctime(&pwd->pw_change)); 570 } 571 } 572 573 #ifdef LOGIN_CAP 574 warntime = login_getcaptime(lc, "warnexpire", 575 DEFAULT_WARN, DEFAULT_WARN); 576 #else 577 warntime = DEFAULT_WARN; 578 #endif 579 580 if (pwd->pw_expire) { 581 if (tp.tv_sec >= pwd->pw_expire) { 582 refused("Sorry -- your account has expired", 583 "EXPIRED", 1); 584 } else if (pwd->pw_expire - tp.tv_sec < warntime && !quietlog) 585 (void)printf("Warning: your account expires on %s", 586 ctime(&pwd->pw_expire)); 587 } 588 589 #ifdef LOGIN_CAP 590 if (lc != NULL) { 591 if (hostname) { 592 struct hostent *hp = gethostbyname(full_hostname); 593 594 if (hp == NULL) 595 optarg = NULL; 596 else { 597 struct in_addr in; 598 memmove(&in, hp->h_addr, sizeof(in)); 599 optarg = strdup(inet_ntoa(in)); 600 } 601 if (!auth_hostok(lc, full_hostname, optarg)) 602 refused("Permission denied", "HOST", 1); 603 } 604 605 if (!auth_ttyok(lc, tty)) 606 refused("Permission denied", "TTY", 1); 607 608 if (!auth_timeok(lc, time(NULL))) 609 refused("Logins not available right now", "TIME", 1); 610 } 611 shell=login_getcapstr(lc, "shell", pwd->pw_shell, pwd->pw_shell); 612 #else /* !LOGIN_CAP */ 613 shell=pwd->pw_shell; 614 #endif /* LOGIN_CAP */ 615 if (*pwd->pw_shell == '\0') 616 pwd->pw_shell = _PATH_BSHELL; 617 if (*shell == '\0') /* Not overridden */ 618 shell = pwd->pw_shell; 619 if ((shell = strdup(shell)) == NULL) { 620 syslog(LOG_NOTICE, "memory allocation error"); 621 sleepexit(1); 622 } 623 624 #ifdef LOGIN_ACCESS 625 if (login_access(pwd->pw_name, hostname ? full_hostname : tty) == 0) 626 refused("Permission denied", "ACCESS", 1); 627 #endif /* LOGIN_ACCESS */ 628 629 /* Nothing else left to fail -- really log in. */ 630 memset((void *)&utmp, 0, sizeof(utmp)); 631 (void)time(&utmp.ut_time); 632 (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name)); 633 if (hostname) 634 (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host)); 635 (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line)); 636 login(&utmp); 637 638 dolastlog(quietlog); 639 640 /* 641 * Set device protections, depending on what terminal the 642 * user is logged in. This feature is used on Suns to give 643 * console users better privacy. 644 */ 645 login_fbtab(tty, pwd->pw_uid, pwd->pw_gid); 646 647 (void)chown(ttyn, pwd->pw_uid, 648 (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid); 649 650 /* 651 * Preserve TERM if it happens to be already set. 652 */ 653 if ((term = getenv("TERM")) != NULL) 654 term = strdup(term); 655 656 /* 657 * Exclude cons/vt/ptys only, assume dialup otherwise 658 * TODO: Make dialup tty determination a library call 659 * for consistency (finger etc.) 660 */ 661 if (hostname==NULL && strchr("vpqstPQST", tty[sizeof("tty")-1]) == NULL) 662 syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name); 663 664 #ifdef KERBEROS 665 if (!quietlog && notickets == 1 && !noticketsdontcomplain) 666 (void)printf("Warning: no Kerberos tickets issued.\n"); 667 #endif 668 669 #ifdef LOGALL 670 /* 671 * Syslog each successful login, so we don't have to watch hundreds 672 * of wtmp or lastlogin files. 673 */ 674 if (hostname) 675 syslog(LOG_INFO, "login from %s on %s as %s", 676 full_hostname, tty, pwd->pw_name); 677 else 678 syslog(LOG_INFO, "login on %s as %s", 679 tty, pwd->pw_name); 680 #endif 681 682 /* 683 * If fflag is on, assume caller/authenticator has logged root login. 684 */ 685 if (rootlogin && fflag == 0) 686 { 687 if (hostname) 688 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s", 689 username, tty, full_hostname); 690 else 691 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", 692 username, tty); 693 } 694 695 /* 696 * Destroy environment unless user has requested its preservation. 697 * We need to do this before setusercontext() because that may 698 * set or reset some environment variables. 699 */ 700 if (!pflag) 701 environ = envinit; 702 703 /* 704 * We don't need to be root anymore, so 705 * set the user and session context 706 */ 707 #ifdef LOGIN_CAP 708 if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETALL) != 0) { 709 syslog(LOG_ERR, "setusercontext() failed - exiting"); 710 exit(1); 711 } 712 #else 713 if (setlogin(pwd->pw_name) < 0) 714 syslog(LOG_ERR, "setlogin() failure: %m"); 715 716 (void)setgid(pwd->pw_gid); 717 initgroups(username, pwd->pw_gid); 718 (void)setuid(rootlogin ? 0 : pwd->pw_uid); 719 #endif 720 721 (void)setenv("SHELL", pwd->pw_shell, 1); 722 (void)setenv("HOME", pwd->pw_dir, 1); 723 if (term != NULL && *term != '\0') 724 (void)setenv("TERM", term, 1); /* Preset overrides */ 725 else { 726 (void)setenv("TERM", stypeof(tty), 0); /* Fallback doesn't */ 727 } 728 (void)setenv("LOGNAME", pwd->pw_name, 1); 729 (void)setenv("USER", pwd->pw_name, 1); 730 (void)setenv("PATH", rootlogin ? _PATH_STDPATH : _PATH_DEFPATH, 0); 731 #ifdef KERBEROS 732 if (krbtkfile_env) 733 (void)setenv("KRBTKFILE", krbtkfile_env, 1); 734 #endif 735 #if LOGIN_CAP_AUTH 736 auth_env(); 737 #endif 738 739 #ifdef LOGIN_CAP 740 if (!quietlog) { 741 char *cw; 742 743 cw = login_getcapstr(lc, "copyright", NULL, NULL); 744 if (cw != NULL && access(cw, F_OK) == 0) 745 motd(cw); 746 else 747 (void)printf("%s\n\t%s %s\n", 748 "Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994", 749 "The Regents of the University of California. ", 750 "All rights reserved."); 751 752 (void)printf("\n"); 753 754 cw = login_getcapstr(lc, "welcome", NULL, NULL); 755 if (cw == NULL || access(cw, F_OK) != 0) 756 cw = _PATH_MOTDFILE; 757 motd(cw); 758 759 cw = getenv("MAIL"); /* $MAIL may have been set by class */ 760 if (cw != NULL) { 761 strncpy(tbuf, cw, sizeof(tbuf)); 762 tbuf[sizeof(tbuf)-1] = '\0'; 763 } else 764 snprintf(tbuf, sizeof(tbuf), "%s/%s", 765 _PATH_MAILDIR, pwd->pw_name); 766 #else 767 if (!quietlog) { 768 (void)printf("%s\n\t%s %s\n", 769 "Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994", 770 "The Regents of the University of California. ", 771 "All rights reserved."); 772 motd(_PATH_MOTDFILE); 773 snprintf(tbuf, sizeof(tbuf), "%s/%s", 774 _PATH_MAILDIR, pwd->pw_name); 775 #endif 776 if (stat(tbuf, &st) == 0 && st.st_size != 0) 777 (void)printf("You have %smail.\n", 778 (st.st_mtime > st.st_atime) ? "new " : ""); 779 } 780 781 #ifdef LOGIN_CAP 782 login_close(lc); 783 #endif 784 785 (void)signal(SIGALRM, SIG_DFL); 786 (void)signal(SIGQUIT, SIG_DFL); 787 (void)signal(SIGINT, SIG_DFL); 788 (void)signal(SIGTSTP, SIG_IGN); 789 790 if (changepass) { 791 if (system(_PATH_CHPASS) != 0) 792 sleepexit(1); 793 } 794 795 /* 796 * Login shells have a leading '-' in front of argv[0] 797 */ 798 tbuf[0] = '-'; 799 (void)strcpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ? p + 1 : pwd->pw_shell); 800 801 execlp(shell, tbuf, 0); 802 err(1, "%s", shell); 803 } 804 805 806 /* 807 * Allow for authentication style and/or kerberos instance 808 * */ 809 810 #define NBUFSIZ UT_NAMESIZE + 64 811 812 void 813 getloginname() 814 { 815 int ch; 816 char *p; 817 static char nbuf[NBUFSIZ]; 818 819 for (;;) { 820 (void)printf("login: "); 821 for (p = nbuf; (ch = getchar()) != '\n'; ) { 822 if (ch == EOF) { 823 badlogin(username); 824 exit(0); 825 } 826 if (p < nbuf + (NBUFSIZ - 1)) 827 *p++ = ch; 828 } 829 if (p > nbuf) 830 if (nbuf[0] == '-') 831 (void)fprintf(stderr, 832 "login names may not start with '-'.\n"); 833 else { 834 *p = '\0'; 835 username = nbuf; 836 break; 837 } 838 } 839 } 840 841 int 842 rootterm(ttyn) 843 char *ttyn; 844 { 845 struct ttyent *t; 846 847 return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE); 848 } 849 850 volatile int motdinterrupt; 851 852 /* ARGSUSED */ 853 void 854 sigint(signo) 855 int signo; 856 { 857 motdinterrupt = 1; 858 } 859 860 void 861 motd(motdfile) 862 char *motdfile; 863 { 864 int fd, nchars; 865 sig_t oldint; 866 char tbuf[256]; 867 868 if ((fd = open(motdfile, O_RDONLY, 0)) < 0) 869 return; 870 motdinterrupt = 0; 871 oldint = signal(SIGINT, sigint); 872 while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0 && !motdinterrupt) 873 (void)write(fileno(stdout), tbuf, nchars); 874 (void)signal(SIGINT, oldint); 875 (void)close(fd); 876 } 877 878 /* ARGSUSED */ 879 void 880 timedout(signo) 881 int signo; 882 { 883 (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout); 884 exit(0); 885 } 886 887 #ifndef LOGIN_CAP 888 void 889 checknologin() 890 { 891 int fd, nchars; 892 char tbuf[8192]; 893 894 if ((fd = open(_PATH_NOLOGIN, O_RDONLY, 0)) >= 0) { 895 while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0) 896 (void)write(fileno(stdout), tbuf, nchars); 897 sleepexit(0); 898 } 899 } 900 #endif 901 902 void 903 dolastlog(quiet) 904 int quiet; 905 { 906 struct lastlog ll; 907 int fd; 908 909 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) { 910 (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET); 911 if (!quiet) { 912 if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) && 913 ll.ll_time != 0) { 914 (void)printf("Last login: %.*s ", 915 24-5, (char *)ctime(&ll.ll_time)); 916 if (*ll.ll_host != '\0') 917 (void)printf("from %.*s\n", 918 (int)sizeof(ll.ll_host), 919 ll.ll_host); 920 else 921 (void)printf("on %.*s\n", 922 (int)sizeof(ll.ll_line), 923 ll.ll_line); 924 } 925 (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET); 926 } 927 memset((void *)&ll, 0, sizeof(ll)); 928 (void)time(&ll.ll_time); 929 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 930 if (hostname) 931 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 932 (void)write(fd, (char *)&ll, sizeof(ll)); 933 (void)close(fd); 934 } 935 } 936 937 void 938 badlogin(name) 939 char *name; 940 { 941 942 if (failures == 0) 943 return; 944 if (hostname) { 945 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s", 946 failures, failures > 1 ? "S" : "", full_hostname); 947 syslog(LOG_AUTHPRIV|LOG_NOTICE, 948 "%d LOGIN FAILURE%s FROM %s, %s", 949 failures, failures > 1 ? "S" : "", full_hostname, name); 950 } else { 951 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s", 952 failures, failures > 1 ? "S" : "", tty); 953 syslog(LOG_AUTHPRIV|LOG_NOTICE, 954 "%d LOGIN FAILURE%s ON %s, %s", 955 failures, failures > 1 ? "S" : "", tty, name); 956 } 957 } 958 959 #undef UNKNOWN 960 #define UNKNOWN "su" 961 962 char * 963 stypeof(ttyid) 964 char *ttyid; 965 { 966 967 struct ttyent *t; 968 969 return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : UNKNOWN); 970 } 971 972 void 973 refused(msg, rtype, lout) 974 char *msg; 975 char *rtype; 976 int lout; 977 { 978 979 if (msg != NULL) 980 printf("%s.\n", msg); 981 if (hostname) 982 syslog(LOG_NOTICE, "LOGIN %s REFUSED (%s) FROM %s ON TTY %s", 983 pwd->pw_name, rtype, full_hostname, tty); 984 else 985 syslog(LOG_NOTICE, "LOGIN %s REFUSED (%s) ON TTY %s", 986 pwd->pw_name, rtype, tty); 987 if (lout) 988 sleepexit(1); 989 } 990 991 void 992 sleepexit(eval) 993 int eval; 994 { 995 996 (void)sleep(5); 997 exit(eval); 998 } 999