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 /* pretend password okay */ 354 rval = 0; 355 goto ttycheck; 356 } 357 } 358 359 fflag = 0; 360 361 (void)setpriority(PRIO_PROCESS, 0, -4); 362 363 #ifdef LOGIN_CAP_AUTH 364 /* 365 * This hands off authorization to an authorization program, 366 * depending on the styles available for the "auth-login", 367 * auth-rlogin (or default) authorization styles. 368 * We do this regardless of whether an account exists so that 369 * the remote user cannot tell a "real" from an invented 370 * account name. If we don't have an account we just fall 371 * back to the first method for the "default" class. 372 */ 373 if (!(style = login_getstyle(lc, auth_method, authtype))) { 374 375 /* 376 * No available authorization method 377 */ 378 rval = 1; 379 (void)printf("No auth method available for %s.\n", 380 authtype); 381 } else { 382 383 /* 384 * Put back the kerberos instance, if any was given. 385 * Don't worry about the non-kerberos case here, since 386 * if kerberos is not available or not selected and an 387 * instance is given at the login prompt, su or rlogin -l, 388 * then anything else should fail as well. 389 */ 390 if (*instance) 391 *(instance - 1) = '.'; 392 393 rval = authenticate(username, 394 lc ? lc->lc_class : "default", 395 style, authtype); 396 /* Junk it again */ 397 if (*instance) 398 *(instance - 1) = '\0'; 399 } 400 401 if (!rval) { 402 char * approvp; 403 404 /* 405 * If authentication succeeds, run any approval 406 * program, if applicable for this class. 407 */ 408 approvep = login_getcapstr(lc, "approve", NULL, NULL); 409 rval = 1; /* Assume bad login again */ 410 411 if (approvep==NULL || 412 auth_script(approvep, approvep, username, 413 lc->lc_class, 0) == 0) { 414 int r; 415 416 r = auth_scan(AUTH_OKAY); 417 /* 418 * See what the authorize program says 419 */ 420 if (r != AUTH_NONE) { 421 rval = 0; 422 423 if (!rootok && (r & AUTH_ROOTOKAY)) 424 rootok = 1; /* root approved */ 425 else 426 rootlogin = 0; 427 428 if (!authok && (r & AUTH_SECURE)) 429 authok = 1; /* secure */ 430 } 431 } 432 } 433 #else /* !LOGIN_CAP_AUTH */ 434 #ifdef SKEY 435 permit_passwd = skeyaccess(username, tty, 436 hostname ? full_hostname : NULL, 437 NULL); 438 p = skey_getpass("Password:", pwd, permit_passwd); 439 ep = skey_crypt(p, salt, pwd, permit_passwd); 440 #else /* !SKEY */ 441 p = getpass("Password:"); 442 ep = crypt(p, salt); 443 #endif/* SKEY */ 444 445 if (pwd) { 446 #ifdef KERBEROS 447 #ifdef SKEY 448 /* 449 * Do not allow user to type in kerberos password 450 * over the net (actually, this is ok for encrypted 451 * links, but we have no way of determining if the 452 * link is encrypted. 453 */ 454 if (!permit_passwd) { 455 rval = 1; /* failed */ 456 } else 457 #endif /* SKEY */ 458 rval = klogin(pwd, instance, localhost, p); 459 if (rval != 0 && rootlogin && pwd->pw_uid != 0) 460 rootlogin = 0; 461 if (rval == 0) 462 authok = 1; /* kerberos authenticated ok */ 463 else if (rval == 1) /* fallback to unix passwd */ 464 rval = strcmp(ep, pwd->pw_passwd); 465 #else /* !KERBEROS */ 466 rval = strcmp(ep, pwd->pw_passwd); 467 #endif /* KERBEROS */ 468 } 469 470 /* clear entered password */ 471 memset(p, 0, strlen(p)); 472 #endif /* LOGIN_CAP_AUTH */ 473 474 (void)setpriority(PRIO_PROCESS, 0, 0); 475 476 #ifdef LOGIN_CAP 477 if (rval) 478 auth_rmfiles(); 479 #endif 480 ttycheck: 481 /* 482 * If trying to log in as root without Kerberos, 483 * but with insecure terminal, refuse the login attempt. 484 */ 485 if (pwd && !rval) { 486 #if defined(KERBEROS) || defined(LOGIN_CAP_AUTH) 487 if (authok == 0 && rootlogin && !rootok) 488 #else 489 if (rootlogin && !rootok) 490 #endif 491 refused(NULL, "NOROOT", 0); 492 else /* valid password & authenticated */ 493 break; 494 } 495 496 (void)printf("Login incorrect\n"); 497 failures++; 498 499 /* 500 * we allow up to 'retry' (10) tries, 501 * but after 'backoff' (3) we start backing off 502 */ 503 if (++cnt > backoff) { 504 if (cnt >= retries) { 505 badlogin(username); 506 sleepexit(1); 507 } 508 sleep((u_int)((cnt - 3) * 5)); 509 } 510 } 511 512 /* committed to login -- turn off timeout */ 513 (void)alarm((u_int)0); 514 515 endpwent(); 516 517 /* if user not super-user, check for disabled logins */ 518 #ifdef LOGIN_CAP 519 if (!rootlogin) 520 auth_checknologin(lc); 521 #else 522 if (!rootlogin) 523 checknologin(); 524 #endif 525 526 #ifdef LOGIN_CAP 527 quietlog = login_getcapbool(lc, "hushlogin", 0); 528 #else 529 quietlog = 0; 530 #endif 531 if (!*pwd->pw_dir || chdir(pwd->pw_dir) < 0) { 532 #ifdef LOGIN_CAP 533 if (login_getcapbool(lc, "requirehome", !rootlogin)) 534 refused("Home directory not available", "HOMEDIR", 1); 535 #endif 536 if (chdir("/") < 0) { 537 refused("Cannot find root directory", "ROOTDIR", 1); 538 pwd->pw_dir = "/"; 539 if (!quietlog || *pwd->pw_dir) 540 printf("No home directory.\nLogging in with home = \"/\".\n"); 541 } 542 if (!quietlog) 543 quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0; 544 545 if (pwd->pw_change || pwd->pw_expire) 546 (void)gettimeofday(&tp, (struct timezone *)NULL); 547 548 #define DEFAULT_WARN (2L * 7L & 86400L) /* Two weeks */ 549 550 #ifdef LOGIN_CAP 551 warntime = login_getcaptime(lc, "warnpassword", 552 DEFAULT_WARN, DEFAULT_WARN); 553 #else 554 warntime = DEFAULT_WARN; 555 #endif 556 557 changepass=0; 558 if (pwd->pw_change) { 559 if (tp.tv_sec >= pwd->pw_change) { 560 (void)printf("Sorry -- your password has expired.\n"); 561 changepass=1; 562 syslog(LOG_INFO, 563 "%s Password expired - forcing change", 564 pwd->pw_name); 565 } else if (pwd->pw_change - tp.tv_sec < warntime && !quietlog) 566 (void)printf("Warning: your password expires on %s", 567 ctime(&pwd->pw_change)); 568 } 569 } 570 571 #ifdef LOGIN_CAP 572 warntime = login_getcaptime(lc, "warnexpire", 573 DEFAULT_WARN, DEFAULT_WARN); 574 #else 575 warntime = DEFAULT_WARN; 576 #endif 577 578 if (pwd->pw_expire) { 579 if (tp.tv_sec >= pwd->pw_expire) { 580 refused("Sorry -- your account has expired", 581 "EXPIRED", 1); 582 } else if (pwd->pw_expire - tp.tv_sec < warntime && !quietlog) 583 (void)printf("Warning: your account expires on %s", 584 ctime(&pwd->pw_expire)); 585 } 586 587 #ifdef LOGIN_CAP 588 if (lc != NULL) { 589 if (hostname) { 590 struct hostent *hp = gethostbyname(full_hostname); 591 592 if (hp == NULL) 593 optarg = NULL; 594 else { 595 struct in_addr in; 596 memmove(&in, hp->h_addr, sizeof(in)); 597 optarg = strdup(inet_ntoa(in)); 598 } 599 if (!auth_hostok(lc, full_hostname, optarg)) 600 refused("Permission denied", "HOST", 1); 601 } 602 603 if (!auth_ttyok(lc, tty)) 604 refused("Permission denied", "TTY", 1); 605 606 if (!auth_timeok(lc, time(NULL))) 607 refused("Logins not available right now", "TIME", 1); 608 } 609 shell=login_getcapstr(lc, "shell", pwd->pw_shell, pwd->pw_shell); 610 #else /* !LOGIN_CAP */ 611 shell=pwd->pw_shell; 612 #endif /* LOGIN_CAP */ 613 if (*pwd->pw_shell == '\0') 614 pwd->pw_shell = _PATH_BSHELL; 615 if (*shell == '\0') /* Not overridden */ 616 shell = pwd->pw_shell; 617 if ((shell = strdup(shell)) == NULL) { 618 syslog(LOG_NOTICE, "memory allocation error"); 619 sleepexit(1); 620 } 621 622 #ifdef LOGIN_ACCESS 623 if (login_access(pwd->pw_name, hostname ? full_hostname : tty) == 0) 624 refused("Permission denied", "ACCESS", 1); 625 #endif /* LOGIN_ACCESS */ 626 627 /* Nothing else left to fail -- really log in. */ 628 memset((void *)&utmp, 0, sizeof(utmp)); 629 (void)time(&utmp.ut_time); 630 (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name)); 631 if (hostname) 632 (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host)); 633 (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line)); 634 login(&utmp); 635 636 dolastlog(quietlog); 637 638 /* 639 * Set device protections, depending on what terminal the 640 * user is logged in. This feature is used on Suns to give 641 * console users better privacy. 642 */ 643 login_fbtab(tty, pwd->pw_uid, pwd->pw_gid); 644 645 (void)chown(ttyn, pwd->pw_uid, 646 (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid); 647 648 /* 649 * Preserve TERM if it happens to be already set. 650 */ 651 if ((term = getenv("TERM")) != NULL) 652 term = strdup(term); 653 654 /* 655 * Exclude cons/vt/ptys only, assume dialup otherwise 656 * TODO: Make dialup tty determination a library call 657 * for consistency (finger etc.) 658 */ 659 if (hostname==NULL && strchr("vpqstPQST", tty[sizeof("tty")-1]) == NULL) 660 syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name); 661 662 #ifdef KERBEROS 663 if (!quietlog && notickets == 1 && !noticketsdontcomplain) 664 (void)printf("Warning: no Kerberos tickets issued.\n"); 665 #endif 666 667 #ifdef LOGALL 668 /* 669 * Syslog each successful login, so we don't have to watch hundreds 670 * of wtmp or lastlogin files. 671 */ 672 if (hostname) 673 syslog(LOG_INFO, "login from %s on %s as %s", 674 full_hostname, tty, pwd->pw_name); 675 else 676 syslog(LOG_INFO, "login on %s as %s", 677 tty, pwd->pw_name); 678 #endif 679 680 /* 681 * If fflag is on, assume caller/authenticator has logged root login. 682 */ 683 if (rootlogin && fflag == 0) 684 { 685 if (hostname) 686 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s", 687 username, tty, full_hostname); 688 else 689 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", 690 username, tty); 691 } 692 693 /* 694 * Destroy environment unless user has requested its preservation. 695 * We need to do this before setusercontext() because that may 696 * set or reset some environment variables. 697 */ 698 if (!pflag) 699 environ = envinit; 700 701 /* 702 * We don't need to be root anymore, so 703 * set the user and session context 704 */ 705 #ifdef LOGIN_CAP 706 if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETALL) != 0) { 707 syslog(LOG_ERR, "setusercontext() failed - exiting"); 708 exit(1); 709 } 710 #else 711 if (setlogin(pwd->pw_name) < 0) 712 syslog(LOG_ERR, "setlogin() failure: %m"); 713 714 (void)setgid(pwd->pw_gid); 715 initgroups(username, pwd->pw_gid); 716 (void)setuid(rootlogin ? 0 : pwd->pw_uid); 717 #endif 718 719 (void)setenv("SHELL", pwd->pw_shell, 1); 720 (void)setenv("HOME", pwd->pw_dir, 1); 721 if (term != NULL && *term != '\0') 722 (void)setenv("TERM", term, 1); /* Preset overrides */ 723 else { 724 (void)setenv("TERM", stypeof(tty), 0); /* Fallback doesn't */ 725 } 726 (void)setenv("LOGNAME", pwd->pw_name, 1); 727 (void)setenv("USER", pwd->pw_name, 1); 728 (void)setenv("PATH", rootlogin ? _PATH_STDPATH : _PATH_DEFPATH, 0); 729 #ifdef KERBEROS 730 if (krbtkfile_env) 731 (void)setenv("KRBTKFILE", krbtkfile_env, 1); 732 #endif 733 #if LOGIN_CAP_AUTH 734 auth_env(); 735 #endif 736 737 #ifdef LOGIN_CAP 738 if (!quietlog) { 739 char *cw; 740 741 cw = login_getcapstr(lc, "copyright", NULL, NULL); 742 if (cw != NULL && access(cw, F_OK) == 0) 743 motd(cw); 744 else 745 (void)printf("%s\n\t%s %s\n", 746 "Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994", 747 "The Regents of the University of California. ", 748 "All rights reserved."); 749 750 (void)printf("\n"); 751 752 cw = login_getcapstr(lc, "welcome", NULL, NULL); 753 if (cw == NULL || access(cw, F_OK) != 0) 754 cw = _PATH_MOTDFILE; 755 motd(cw); 756 757 cw = getenv("MAIL"); /* $MAIL may have been set by class */ 758 if (cw != NULL) { 759 strncpy(tbuf, cw, sizeof(tbuf)); 760 tbuf[sizeof(tbuf)-1] = '\0'; 761 } else 762 snprintf(tbuf, sizeof(tbuf), "%s/%s", 763 _PATH_MAILDIR, pwd->pw_name); 764 #else 765 if (!quietlog) { 766 (void)printf("%s\n\t%s %s\n", 767 "Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994", 768 "The Regents of the University of California. ", 769 "All rights reserved."); 770 motd(_PATH_MOTDFILE); 771 snprintf(tbuf, sizeof(tbuf), "%s/%s", 772 _PATH_MAILDIR, pwd->pw_name); 773 #endif 774 if (stat(tbuf, &st) == 0 && st.st_size != 0) 775 (void)printf("You have %smail.\n", 776 (st.st_mtime > st.st_atime) ? "new " : ""); 777 } 778 779 #ifdef LOGIN_CAP 780 login_close(lc); 781 #endif 782 783 (void)signal(SIGALRM, SIG_DFL); 784 (void)signal(SIGQUIT, SIG_DFL); 785 (void)signal(SIGINT, SIG_DFL); 786 (void)signal(SIGTSTP, SIG_IGN); 787 788 if (changepass) { 789 if (system(_PATH_CHPASS) != 0) 790 sleepexit(1); 791 } 792 793 /* 794 * Login shells have a leading '-' in front of argv[0] 795 */ 796 tbuf[0] = '-'; 797 (void)strcpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ? p + 1 : pwd->pw_shell); 798 799 execlp(shell, tbuf, 0); 800 err(1, "%s", shell); 801 } 802 803 804 /* 805 * Allow for authentication style and/or kerberos instance 806 * */ 807 808 #define NBUFSIZ UT_NAMESIZE + 64 809 810 void 811 getloginname() 812 { 813 int ch; 814 char *p; 815 static char nbuf[NBUFSIZ]; 816 817 for (;;) { 818 (void)printf("login: "); 819 for (p = nbuf; (ch = getchar()) != '\n'; ) { 820 if (ch == EOF) { 821 badlogin(username); 822 exit(0); 823 } 824 if (p < nbuf + (NBUFSIZ - 1)) 825 *p++ = ch; 826 } 827 if (p > nbuf) 828 if (nbuf[0] == '-') 829 (void)fprintf(stderr, 830 "login names may not start with '-'.\n"); 831 else { 832 *p = '\0'; 833 username = nbuf; 834 break; 835 } 836 } 837 } 838 839 int 840 rootterm(ttyn) 841 char *ttyn; 842 { 843 struct ttyent *t; 844 845 return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE); 846 } 847 848 volatile int motdinterrupt; 849 850 /* ARGSUSED */ 851 void 852 sigint(signo) 853 int signo; 854 { 855 motdinterrupt = 1; 856 } 857 858 void 859 motd(motdfile) 860 char *motdfile; 861 { 862 int fd, nchars; 863 sig_t oldint; 864 char tbuf[256]; 865 866 if ((fd = open(motdfile, O_RDONLY, 0)) < 0) 867 return; 868 motdinterrupt = 0; 869 oldint = signal(SIGINT, sigint); 870 while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0 && !motdinterrupt) 871 (void)write(fileno(stdout), tbuf, nchars); 872 (void)signal(SIGINT, oldint); 873 (void)close(fd); 874 } 875 876 /* ARGSUSED */ 877 void 878 timedout(signo) 879 int signo; 880 { 881 (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout); 882 exit(0); 883 } 884 885 #ifndef LOGIN_CAP 886 void 887 checknologin() 888 { 889 int fd, nchars; 890 char tbuf[8192]; 891 892 if ((fd = open(_PATH_NOLOGIN, O_RDONLY, 0)) >= 0) { 893 while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0) 894 (void)write(fileno(stdout), tbuf, nchars); 895 sleepexit(0); 896 } 897 } 898 #endif 899 900 void 901 dolastlog(quiet) 902 int quiet; 903 { 904 struct lastlog ll; 905 int fd; 906 907 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) { 908 (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET); 909 if (!quiet) { 910 if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) && 911 ll.ll_time != 0) { 912 (void)printf("Last login: %.*s ", 913 24-5, (char *)ctime(&ll.ll_time)); 914 if (*ll.ll_host != '\0') 915 (void)printf("from %.*s\n", 916 (int)sizeof(ll.ll_host), 917 ll.ll_host); 918 else 919 (void)printf("on %.*s\n", 920 (int)sizeof(ll.ll_line), 921 ll.ll_line); 922 } 923 (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET); 924 } 925 memset((void *)&ll, 0, sizeof(ll)); 926 (void)time(&ll.ll_time); 927 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 928 if (hostname) 929 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 930 (void)write(fd, (char *)&ll, sizeof(ll)); 931 (void)close(fd); 932 } 933 } 934 935 void 936 badlogin(name) 937 char *name; 938 { 939 940 if (failures == 0) 941 return; 942 if (hostname) { 943 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s", 944 failures, failures > 1 ? "S" : "", full_hostname); 945 syslog(LOG_AUTHPRIV|LOG_NOTICE, 946 "%d LOGIN FAILURE%s FROM %s, %s", 947 failures, failures > 1 ? "S" : "", full_hostname, name); 948 } else { 949 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s", 950 failures, failures > 1 ? "S" : "", tty); 951 syslog(LOG_AUTHPRIV|LOG_NOTICE, 952 "%d LOGIN FAILURE%s ON %s, %s", 953 failures, failures > 1 ? "S" : "", tty, name); 954 } 955 } 956 957 #undef UNKNOWN 958 #define UNKNOWN "su" 959 960 char * 961 stypeof(ttyid) 962 char *ttyid; 963 { 964 965 struct ttyent *t; 966 967 return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : UNKNOWN); 968 } 969 970 void 971 refused(msg, rtype, lout) 972 char *msg; 973 char *rtype; 974 int lout; 975 { 976 977 if (msg != NULL) 978 printf("%s.\n", msg); 979 if (hostname) 980 syslog(LOG_NOTICE, "LOGIN %s REFUSED (%s) FROM %s ON TTY %s", 981 pwd->pw_name, rtype, full_hostname, tty); 982 else 983 syslog(LOG_NOTICE, "LOGIN %s REFUSED (%s) ON TTY %s", 984 pwd->pw_name, rtype, tty); 985 if (lout) 986 sleepexit(1); 987 } 988 989 void 990 sleepexit(eval) 991 int eval; 992 { 993 994 (void)sleep(5); 995 exit(eval); 996 } 997