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 #ifndef lint 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 /* not lint */ 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/param.h> 51 #include <sys/stat.h> 52 #include <sys/time.h> 53 #include <sys/resource.h> 54 #include <sys/file.h> 55 #include <netinet/in.h> 56 #include <arpa/inet.h> 57 58 #include <err.h> 59 #include <errno.h> 60 #include <grp.h> 61 #include <netdb.h> 62 #include <pwd.h> 63 #include <setjmp.h> 64 #include <signal.h> 65 #include <stdio.h> 66 #include <stdlib.h> 67 #include <string.h> 68 #include <syslog.h> 69 #include <ttyent.h> 70 #include <unistd.h> 71 #include <utmp.h> 72 73 #ifdef LOGIN_CAP 74 #include <login_cap.h> 75 #else /* Undef AUTH as well */ 76 #undef LOGIN_CAP_AUTH 77 #endif 78 79 /* If LOGIN_CAP_AUTH is activated: 80 * kerberose & skey logins are runtime selected via login 81 * login_getstyle() and authentication types for login classes 82 * The actual login itself is handled via /usr/libexec/login_<style> 83 * Valid styles are determined by the auth-type=style,style entries 84 * in the login class. 85 */ 86 #ifdef LOGIN_CAP_AUTH 87 #undef KERBEROS 88 #undef SKEY 89 #else 90 #ifdef SKEY 91 #include <skey.h> 92 #endif /* SKEY */ 93 #endif /* LOGIN_CAP_AUTH */ 94 95 #include "pathnames.h" 96 97 void badlogin __P((char *)); 98 void checknologin __P((void)); 99 void dolastlog __P((int)); 100 void getloginname __P((void)); 101 void motd __P((char *)); 102 int rootterm __P((char *)); 103 void sigint __P((int)); 104 void sleepexit __P((int)); 105 char *stypeof __P((char *)); 106 void timedout __P((int)); 107 void login_fbtab __P((char *, uid_t, gid_t)); 108 #ifdef KERBEROS 109 int klogin __P((struct passwd *, char *, char *, char *)); 110 #endif 111 112 extern void login __P((struct utmp *)); 113 114 #define TTYGRPNAME "tty" /* name of group to own ttys */ 115 116 /* 117 * This bounds the time given to login. Not a define so it can 118 * be patched on machines where it's too small. 119 */ 120 u_int timeout = 300; 121 122 #ifdef KERBEROS 123 int notickets = 1; 124 int noticketsdontcomplain = 1; 125 char *instance; 126 char *krbtkfile_env; 127 int authok; 128 #endif 129 130 struct passwd *pwd; 131 int failures; 132 char term[64], *envinit[1], *hostname, *username, *tty; 133 char full_hostname[MAXHOSTNAMELEN]; 134 135 int 136 main(argc, argv) 137 int argc; 138 char *argv[]; 139 { 140 extern char **environ; 141 struct group *gr; 142 struct stat st; 143 struct timeval tp; 144 struct utmp utmp; 145 int rootok; 146 int ask, ch, cnt, fflag, hflag, pflag, quietlog, rootlogin, rval; 147 int changepass; 148 uid_t uid; 149 char *domain, *p, *ep, *salt, *ttyn; 150 char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10]; 151 char localhost[MAXHOSTNAMELEN]; 152 char shell[MAXPATHLEN]; 153 #ifdef LOGIN_CAP 154 login_cap_t *lc = NULL; 155 #ifdef LOGIN_CAP_AUTH 156 char *style, *authtype; 157 char *auth_method = NULL; 158 char *instance = NULL; 159 int authok; 160 #else /* !LOGIN_CAP_AUTH */ 161 #ifdef SKEY 162 int permit_passwd = 0; 163 #endif /* SKEY */ 164 #endif /* LOGIN_CAP_AUTH */ 165 #endif /* LOGIN_CAP */ 166 167 (void)signal(SIGALRM, timedout); 168 (void)alarm(timeout); 169 (void)signal(SIGQUIT, SIG_IGN); 170 (void)signal(SIGINT, SIG_IGN); 171 (void)setpriority(PRIO_PROCESS, 0, 0); 172 173 openlog("login", LOG_ODELAY, LOG_AUTH); 174 175 /* 176 * -p is used by getty to tell login not to destroy the environment 177 * -f is used to skip a second login authentication 178 * -h is used by other servers to pass the name of the remote 179 * host to login so that it may be placed in utmp and wtmp 180 */ 181 *full_hostname = '\0'; 182 domain = NULL; 183 if (gethostname(localhost, sizeof(localhost)) < 0) 184 syslog(LOG_ERR, "couldn't get local hostname: %m"); 185 else 186 domain = strchr(localhost, '.'); 187 188 fflag = hflag = pflag = 0; 189 uid = getuid(); 190 while ((ch = getopt(argc, argv, "fh:p")) != EOF) 191 switch (ch) { 192 case 'f': 193 fflag = 1; 194 break; 195 case 'h': 196 if (uid) 197 errx(1, "-h option: %s", strerror(EPERM)); 198 hflag = 1; 199 strncpy(full_hostname, optarg, sizeof(full_hostname)-1); 200 if (domain && (p = strchr(optarg, '.')) && 201 strcasecmp(p, domain) == 0) 202 *p = 0; 203 if (strlen(optarg) > UT_HOSTSIZE) { 204 struct hostent *hp = gethostbyname(optarg); 205 206 if (hp != NULL) { 207 struct in_addr in; 208 209 memmove(&in, hp->h_addr, sizeof(in)); 210 optarg = strdup(inet_ntoa(in)); 211 } else 212 optarg = "invalid hostname"; 213 } 214 hostname = optarg; 215 break; 216 case 'p': 217 pflag = 1; 218 break; 219 case '?': 220 default: 221 if (!uid) 222 syslog(LOG_ERR, "invalid flag %c", ch); 223 (void)fprintf(stderr, 224 "usage: login [-fp] [-h hostname] [username]\n"); 225 exit(1); 226 } 227 argc -= optind; 228 argv += optind; 229 230 if (*argv) { 231 username = *argv; 232 ask = 0; 233 } else 234 ask = 1; 235 236 for (cnt = getdtablesize(); cnt > 2; cnt--) 237 (void)close(cnt); 238 239 ttyn = ttyname(STDIN_FILENO); 240 if (ttyn == NULL || *ttyn == '\0') { 241 (void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY); 242 ttyn = tname; 243 } 244 if (tty = strrchr(ttyn, '/')) 245 ++tty; 246 else 247 tty = ttyn; 248 249 #ifdef LOGIN_CAP_AUTH 250 authtype = hostname ? "rlogin" : "login"; 251 #endif 252 253 for (cnt = 0;; ask = 1) { 254 if (ask) { 255 fflag = 0; 256 getloginname(); 257 } 258 rootlogin = 0; 259 rootok = rootterm(tty); /* Default (auth may change) */ 260 #ifdef LOGIN_CAP_AUTH 261 authok = 0; 262 if (auth_method = strchr(username, ':')) { 263 *auth_method = '\0'; 264 auth_method++; 265 if (*auth_method == '\0') 266 auth_method = NULL; 267 } 268 /* 269 * We need to do this regardless of whether 270 * kerberos is available. 271 */ 272 if ((instance = strchr(username, '.')) != NULL) { 273 if (strncmp(instance, ".root", 5) == 0) 274 rootlogin = 1; 275 *instance++ = '\0'; 276 } else 277 instance = ""; 278 #else /* !LOGIN_CAP_AUTH */ 279 #ifdef KERBEROS 280 if ((instance = strchr(username, '.')) != NULL) { 281 if (strncmp(instance, ".root", 5) == 0) 282 rootlogin = 1; 283 *instance++ = '\0'; 284 } else 285 instance = ""; 286 #endif /* KERBEROS */ 287 #endif /* LOGIN_CAP_AUTH */ 288 289 if (strlen(username) > UT_NAMESIZE) 290 username[UT_NAMESIZE] = '\0'; 291 292 /* 293 * Note if trying multiple user names; log failures for 294 * previous user name, but don't bother logging one failure 295 * for nonexistent name (mistyped username). 296 */ 297 if (failures && strcmp(tbuf, username)) { 298 if (failures > (pwd ? 0 : 1)) 299 badlogin(tbuf); 300 failures = 0; 301 } 302 (void)strcpy(tbuf, username); 303 304 pwd = getpwnam(username); 305 #ifdef LOGIN_CAP 306 /* Establish the class now, before we might goto 307 * within the next block. pwd can be NULL since it 308 * falls back to the "default" class if it is. 309 */ 310 lc = login_getclass(pwd); 311 #endif /* LOGIN_CAP */ 312 313 /* 314 * if we have a valid account name, and it doesn't have a 315 * password, or the -f option was specified and the caller 316 * is root or the caller isn't changing their uid, don't 317 * authenticate. 318 */ 319 if (pwd != NULL) { 320 salt = pwd->pw_passwd; 321 if (pwd->pw_uid == 0) 322 rootlogin = 1; 323 324 if (fflag && (uid == 0 || uid == pwd->pw_uid)) { 325 /* already authenticated */ 326 break; 327 } else if (pwd->pw_passwd[0] == '\0') { 328 /* pretend password okay */ 329 rval = 0; 330 goto ttycheck; 331 } 332 } 333 else 334 salt = "xx"; 335 336 fflag = 0; 337 338 (void)setpriority(PRIO_PROCESS, 0, -4); 339 340 #ifdef LOGIN_CAP_AUTH 341 /* 342 * This hands off authorisation to an authorisation program, 343 * depending on the styles available for the "auth-login", 344 * auth-rlogin (or default) authorisation styles. 345 * We do this regardless of whether an account exists so that 346 * the remote user cannot tell a "real" from an invented 347 * account name. If we don't have an account we just fall 348 * back to the first method for the "default" class. 349 */ 350 if ((style = login_getstyle(lc, auth_method, authtype)) == NULL) { 351 rval = 1; /* No available authorisation method */ 352 (void)printf("No auth method available for %s.\n", authtype); 353 } else { 354 /* Put back the kerberos instance, if any was given. 355 * Don't worry about the non-kerberos case here, since 356 * if kerberos is not available or not selected and an 357 * instance is given at the login prompt, su or rlogin -l, 358 * then anything else should fail as well. 359 */ 360 if (*instance) 361 *(instance - 1) = '.'; 362 rval = authenticate(username, lc ? lc->lc_class : "default", style, authtype); 363 /* Junk it again */ 364 if (*instance) 365 *(instance - 1) = '\0'; 366 } 367 368 if (!rval) { 369 /* 370 * If authentication succeeds, run any approval 371 * program, if applicable for this class. 372 */ 373 char *approvep = login_getcapstr(lc, "approve", NULL, NULL); 374 rval = 1; /* Assume bad login again */ 375 if (approvep==NULL || auth_script(approvep, approvep, username, lc->lc_class, 0) == 0) { 376 int r = auth_scan(AUTH_OKAY); 377 /* See what the authorise program says */ 378 if (r != AUTH_NONE) { 379 rval = 0; 380 if (!rootok && (r & AUTH_ROOTOKAY)) 381 rootok = 1; /* root approved */ 382 else rootlogin = 0; 383 if (!authok && (r & AUTH_SECURE)) 384 authok = 1; /* secure */ 385 } 386 } 387 } 388 #else /* !LOGIN_CAP_AUTH */ 389 #ifdef SKEY 390 permit_passwd = skeyaccess(username, tty, hostname ? full_hostname : NULL, NULL); 391 p = skey_getpass("Password:", pwd, permit_passwd); 392 ep = skey_crypt(p, salt, pwd, permit_passwd); 393 #else /* !SKEY */ 394 p = getpass("Password:"); 395 ep = crypt(p, salt); 396 #endif/* SKEY */ 397 #ifdef KERBEROS 398 #ifdef SKEY 399 if (pwd) { 400 /* Do not allow user to type in kerberos password 401 * over the net (actually, this is ok for encrypted 402 * links, but we have no way of determining if the 403 * link is encrypted. 404 */ 405 if (!permit_passwd) { 406 rval = 1; /* force failure */ 407 } else 408 #endif /* SKEY */ 409 rval = klogin(pwd, instance, localhost, p); 410 if (rval != 0 && rootlogin && pwd->pw_uid != 0) 411 rootlogin = 0; 412 if (rval == 0) 413 authok = 1; /* kerberos authenticated ok */ 414 else if (rval == 1) /* fallback to unix passwd */ 415 rval = strcmp(ep, pwd->pw_passwd); 416 #ifdef SKEY 417 } 418 #endif /* SKEY */ 419 #else /* !KERBEROS */ 420 rval = strcmp(ep, pwd->pw_passwd); 421 #endif /* KERBEROS */ 422 /* clear entered password */ 423 memset(p, 0, strlen(p)); 424 #endif /* LOGIN_CAP_AUTH */ 425 426 (void)setpriority(PRIO_PROCESS, 0, 0); 427 #ifdef LOGIN_CAP 428 if (rval) 429 auth_rmfiles(); 430 #endif 431 ttycheck: 432 /* 433 * If trying to log in as root without Kerberos, 434 * but with insecure terminal, refuse the login attempt. 435 */ 436 #if defined(KERBEROS) || defined(LOGIN_CAP_AUTH) 437 if (authok == 0) 438 #endif 439 if (pwd && !rval && rootlogin && !rootok) { 440 (void)fprintf(stderr, "%s login refused on this terminal.\n", pwd->pw_name); 441 if (hostname) 442 syslog(LOG_NOTICE, "LOGIN %s REFUSED FROM %s ON TTY %s", pwd->pw_name, full_hostname, tty); 443 else 444 syslog(LOG_NOTICE, "LOGIN %s REFUSED ON TTY %s", pwd->pw_name, tty); 445 continue; 446 } 447 448 if (pwd && !rval) /* valid password & authenticated */ 449 break; 450 451 (void)printf("Login incorrect\n"); 452 failures++; 453 /* we allow 10 tries, but after 3 we start backing off */ 454 if (++cnt > 3) { 455 if (cnt >= 10) { 456 badlogin(username); 457 sleepexit(1); 458 } 459 sleep((u_int)((cnt - 3) * 5)); 460 } 461 } 462 463 /* committed to login -- turn off timeout */ 464 (void)alarm((u_int)0); 465 466 endpwent(); 467 468 /* if user not super-user, check for disabled logins */ 469 #ifdef LOGIN_CAP 470 if (!rootlogin) 471 auth_checknologin(lc); 472 #else 473 if (!rootlogin) 474 checknologin(); 475 #endif 476 477 #ifdef LOGIN_CAP 478 quietlog = login_getcapbool(lc, "hushlogin", 0); 479 #else 480 quietlog = 0; 481 #endif 482 if (!*pwd->pw_dir || chdir(pwd->pw_dir) < 0) { 483 #ifdef LOGIN_CAP 484 if (login_getcapbool(lc, "requirehome", !rootlogin) || chdir("/") < 0) { 485 (void)printf("No home directory %s!\n", pwd->pw_dir); 486 sleepexit(1); 487 } 488 #else 489 if (chdir("/") < 0) { 490 (void)printf("No home directory %s!\n", pwd->pw_dir); 491 sleepexit(1); 492 } 493 #endif 494 pwd->pw_dir = "/"; 495 if (!quietlog) 496 (void)printf("No home directory.\nLogging in with home = \"/\".\n"); 497 } 498 if (!quietlog) 499 quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0; 500 501 if (pwd->pw_change || pwd->pw_expire) 502 (void)gettimeofday(&tp, (struct timezone *)NULL); 503 504 #define DEFAULT_WARN (2L * 7L & 86400L) /* Two weeks */ 505 506 changepass=0; 507 if (pwd->pw_change) { 508 if (tp.tv_sec >= pwd->pw_change) { 509 (void)printf("Sorry -- your password has expired.\n"); 510 syslog(LOG_NOTICE, "%s Password expired - forcing change", pwd->pw_name); 511 changepass=1; 512 #ifdef LOGIN_CAP 513 } else { 514 time_t warntime = (time_t)login_getcaptime(lc, "warnpassword", DEFAULT_WARN, DEFAULT_WARN); 515 if (pwd->pw_change - tp.tv_sec < warntime && !quietlog) 516 (void)printf("Warning: your password expires on %s", ctime(&pwd->pw_change)); 517 } 518 #else 519 } else if (pwd->pw_change - tp.tv_sec < DEFAULT_WARN && !quietlog) { 520 (void)printf("Warning: your password expires on %s", ctime(&pwd->pw_change)); 521 } 522 #endif 523 } 524 if (pwd->pw_expire) { 525 if (tp.tv_sec >= pwd->pw_expire) { 526 (void)printf("Sorry -- your account has expired.\n"); 527 syslog(LOG_NOTICE, "%s Account expired - login refused", pwd->pw_name); 528 sleepexit(1); 529 #ifdef LOGIN_CAP 530 } else { 531 time_t warntime = (time_t)login_getcaptime(lc, "warnexpire", DEFAULT_WARN, DEFAULT_WARN); 532 if (pwd->pw_expire - tp.tv_sec < warntime && !quietlog) 533 (void)printf("Warning: your account expires on %s", 534 ctime(&pwd->pw_expire)); 535 } 536 #else 537 } else if (pwd->pw_expire - tp.tv_sec < DEFAULT_WARN && !quietlog) { 538 (void)printf("Warning: your account expires on %s", 539 ctime(&pwd->pw_expire)); 540 } 541 #endif 542 } 543 544 #ifdef LOGIN_CAP 545 if (lc != NULL) { 546 char *msg = NULL; 547 548 if (hostname) { 549 struct hostent *hp = gethostbyname(full_hostname); 550 551 if (hp == NULL) 552 optarg = NULL; 553 else { 554 struct in_addr in; 555 memmove(&in, hp->h_addr, sizeof(in)); 556 optarg = strdup(inet_ntoa(in)); 557 } 558 if (!auth_hostok(lc, full_hostname, optarg)) { 559 syslog(LOG_NOTICE, "%s LOGIN REFUSED (HOST) FROM %s", pwd->pw_name, full_hostname); 560 msg = "Permission denied"; 561 } 562 } 563 564 if (msg == NULL && !auth_ttyok(lc, tty)) { 565 syslog(LOG_NOTICE, "%s LOGIN REFUSED (TTY) ON %s", pwd->pw_name, tty); 566 msg = "Permission denied"; 567 } 568 569 if (msg == NULL && !auth_timeok(lc, time(NULL))) { 570 syslog(LOG_NOTICE, "%s LOGIN REFUSED (TIME) %s %s", pwd->pw_name, hostname?"FROM":"ON", hostname?full_hostname:tty); 571 msg = "Logins not available right now"; 572 } 573 574 if (msg != NULL) { 575 printf("%s.\n", msg); 576 sleepexit(1); 577 } 578 } 579 strncpy(shell, login_getcapstr(lc, "shell", pwd->pw_shell, pwd->pw_shell), sizeof shell); 580 #else /* !LOGIN_CAP */ 581 strncpy(shell, pwd->pw_shell, sizeof shell); 582 #endif /* LOGIN_CAP */ 583 shell[sizeof shell - 1] = '\0'; 584 585 #ifdef LOGIN_ACCESS 586 if (login_access(pwd->pw_name, hostname ? full_hostname : tty) == 0) { 587 printf("Permission denied\n"); 588 syslog(LOG_NOTICE, "%s LOGIN REFUSED (ACCESS) %s %s", pwd->pw_name, hostname?"FROM":"ON", hostname?full_hostname:tty); 589 sleepexit(1); 590 } 591 #endif /* LOGIN_ACCESS */ 592 593 /* Nothing else left to fail -- really log in. */ 594 memset((void *)&utmp, 0, sizeof(utmp)); 595 (void)time(&utmp.ut_time); 596 (void)strncpy(utmp.ut_name, username, sizeof(utmp.ut_name)); 597 if (hostname) 598 (void)strncpy(utmp.ut_host, hostname, sizeof(utmp.ut_host)); 599 (void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line)); 600 login(&utmp); 601 602 dolastlog(quietlog); 603 604 /* 605 * Set device protections, depending on what terminal the 606 * user is logged in. This feature is used on Suns to give 607 * console users better privacy. 608 */ 609 login_fbtab(tty, pwd->pw_uid, pwd->pw_gid); 610 611 (void)chown(ttyn, pwd->pw_uid, (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid); 612 613 /* Preserve TERM if it happens to be already set */ 614 if ((p = getenv("TERM")) != NULL) { 615 (void)strncpy(term, p, sizeof(term)); 616 term[sizeof(term)-1] = '\0'; 617 } 618 619 /* Exclude cons/vt/ptys only, assume dialup otherwise */ 620 if (hostname==NULL && strchr("vpqstPQST", tty[sizeof("tty")-1]) == NULL) 621 syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name); 622 623 /* If fflag is on, assume caller/authenticator has logged root login. */ 624 if (rootlogin && fflag == 0) 625 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s%s%s", username, tty, hostname?" FROM ":"", hostname?full_hostname:""); 626 627 #ifdef KERBEROS 628 if (!quietlog && notickets == 1 && !noticketsdontcomplain) 629 (void)printf("Warning: no Kerberos tickets issued.\n"); 630 #endif 631 632 #ifdef LOGALL 633 /* 634 * Syslog each successful login, so we don't have to watch hundreds 635 * of wtmp or lastlogin files. 636 */ 637 syslog(LOG_INFO, "login %s %s as %s", hostname?"from":"on", hostname?full_hostname:tty, pwd->pw_name); 638 #endif 639 640 /* Destroy environment unless user has requested its preservation. */ 641 if (!pflag) 642 environ = envinit; 643 644 /* We don't need to be root anymore, so 645 * set the user and session context 646 */ 647 #ifdef LOGIN_CAP 648 if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETALL) != 0) { 649 syslog(LOG_ERR, "setusercontext() failed - exiting"); 650 exit(1); 651 } 652 #else 653 if (setlogin(pwd->pw_name) < 0) 654 syslog(LOG_ERR, "setlogin() failure: %m"); 655 656 (void)setgid(pwd->pw_gid); 657 initgroups(username, pwd->pw_gid); 658 (void)setuid(rootlogin ? 0 : pwd->pw_uid); 659 #endif 660 661 if (*pwd->pw_shell == '\0') 662 pwd->pw_shell = _PATH_BSHELL; 663 (void)setenv("SHELL", pwd->pw_shell, 1); 664 (void)setenv("HOME", pwd->pw_dir, 1); 665 if (term[0] != '\0') 666 (void)setenv("TERM", term, 1); /* Preset overrides */ 667 else { 668 (void)strncpy(term, stypeof(tty), sizeof(term)); 669 term[sizeof(term)-1] = '\0'; 670 (void)setenv("TERM", term, 0); /* Fallback doesn't */ 671 } 672 (void)setenv("LOGNAME", pwd->pw_name, 1); 673 (void)setenv("USER", pwd->pw_name, 1); 674 (void)setenv("PATH", rootlogin ? _PATH_STDPATH : _PATH_DEFPATH, 0); 675 #if LOGIN_CAP_AUTH 676 auth_env(); 677 #else 678 #ifdef KERBEROS 679 if (krbtkfile_env) 680 (void)setenv("KRBTKFILE", krbtkfile_env, 1); 681 #endif 682 #endif 683 684 if (!quietlog) { 685 #ifdef LOGIN_CAP 686 char *cw = login_getcapstr(lc, "copyright", NULL, NULL); 687 if (cw != NULL && access(cw, F_OK) == 0) 688 motd(cw); 689 else 690 #endif 691 (void)printf("Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994\n" 692 "\tThe Regents of the University of California. All rights reserved.\n"); 693 (void)printf("\n"); 694 #ifdef LOGIN_CAP 695 cw = login_getcapstr(lc, "welcome", NULL, NULL); 696 if (cw == NULL || access(cw, F_OK) != 0) 697 cw = _PATH_MOTDFILE; 698 motd(cw); 699 cw = getenv("MAIL"); /* $MAIL may have been set by class */ 700 if (cw != NULL) { 701 strncpy(tbuf, cw, sizeof(tbuf)); 702 tbuf[sizeof(tbuf)-1] = '\0'; 703 } else 704 snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pwd->pw_name); 705 #else 706 motd(_PATH_MOTDFILE); 707 snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pwd->pw_name); 708 #endif 709 if (stat(tbuf, &st) == 0 && st.st_size != 0) 710 (void)printf("You have %smail.\n", (st.st_mtime > st.st_atime) ? "new " : ""); 711 } 712 713 /* Login shells have a leading '-' in front of argv[0] */ 714 tbuf[0] = '-'; 715 (void)strcpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ? p + 1 : pwd->pw_shell); 716 717 #ifdef LOGIN_CAP 718 login_close(lc); 719 #endif 720 721 (void)signal(SIGALRM, SIG_DFL); 722 (void)signal(SIGQUIT, SIG_DFL); 723 (void)signal(SIGINT, SIG_DFL); 724 (void)signal(SIGTSTP, SIG_IGN); 725 726 if (changepass) { 727 if (system(_PATH_CHPASS) != 0) 728 sleepexit(1); 729 } 730 731 execlp(shell, tbuf, 0); 732 err(1, "%s", shell); 733 } 734 735 736 /* Allow for authentication style and/or kerberos instance */ 737 738 #define NBUFSIZ UT_NAMESIZE + 64 739 740 void 741 getloginname() 742 { 743 int ch; 744 char *p; 745 static char nbuf[NBUFSIZ]; 746 747 for (;;) { 748 (void)printf("login: "); 749 for (p = nbuf; (ch = getchar()) != '\n'; ) { 750 if (ch == EOF) { 751 badlogin(username); 752 exit(0); 753 } 754 if (p < nbuf + (NBUFSIZ - 1)) 755 *p++ = ch; 756 } 757 if (p > nbuf) 758 if (nbuf[0] == '-') 759 (void)fprintf(stderr, 760 "login names may not start with '-'.\n"); 761 else { 762 *p = '\0'; 763 username = nbuf; 764 break; 765 } 766 } 767 } 768 769 int 770 rootterm(ttyn) 771 char *ttyn; 772 { 773 struct ttyent *t; 774 return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE); 775 } 776 777 volatile int motdinterrupt; 778 779 /* ARGSUSED */ 780 void 781 sigint(signo) 782 int signo; 783 { 784 motdinterrupt = 1; 785 } 786 787 void 788 motd(motdfile) 789 char *motdfile; 790 { 791 int fd, nchars; 792 sig_t oldint; 793 char tbuf[256]; 794 795 if ((fd = open(motdfile, O_RDONLY, 0)) < 0) 796 return; 797 motdinterrupt = 0; 798 oldint = signal(SIGINT, sigint); 799 while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0 && !motdinterrupt) 800 (void)write(fileno(stdout), tbuf, nchars); 801 (void)signal(SIGINT, oldint); 802 (void)close(fd); 803 } 804 805 /* ARGSUSED */ 806 void 807 timedout(signo) 808 int signo; 809 { 810 (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout); 811 exit(0); 812 } 813 814 #ifndef LOGIN_CAP 815 void 816 checknologin() 817 { 818 int fd, nchars; 819 char tbuf[8192]; 820 821 if ((fd = open(_PATH_NOLOGIN, O_RDONLY, 0)) >= 0) { 822 while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0) 823 (void)write(fileno(stdout), tbuf, nchars); 824 sleepexit(0); 825 } 826 } 827 #endif 828 829 void 830 dolastlog(quiet) 831 int quiet; 832 { 833 struct lastlog ll; 834 int fd; 835 836 if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) { 837 (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET); 838 if (!quiet) { 839 if (read(fd, (char *)&ll, sizeof(ll)) == sizeof(ll) && 840 ll.ll_time != 0) { 841 (void)printf("Last login: %.*s ", 842 24-5, (char *)ctime(&ll.ll_time)); 843 if (*ll.ll_host != '\0') 844 (void)printf("from %.*s\n", 845 (int)sizeof(ll.ll_host), 846 ll.ll_host); 847 else 848 (void)printf("on %.*s\n", 849 (int)sizeof(ll.ll_line), 850 ll.ll_line); 851 } 852 (void)lseek(fd, (off_t)pwd->pw_uid * sizeof(ll), L_SET); 853 } 854 memset((void *)&ll, 0, sizeof(ll)); 855 (void)time(&ll.ll_time); 856 (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line)); 857 if (hostname) 858 (void)strncpy(ll.ll_host, hostname, sizeof(ll.ll_host)); 859 (void)write(fd, (char *)&ll, sizeof(ll)); 860 (void)close(fd); 861 } 862 } 863 864 void 865 badlogin(name) 866 char *name; 867 { 868 869 if (failures == 0) 870 return; 871 if (hostname) { 872 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s", 873 failures, failures > 1 ? "S" : "", full_hostname); 874 syslog(LOG_AUTHPRIV|LOG_NOTICE, 875 "%d LOGIN FAILURE%s FROM %s, %s", 876 failures, failures > 1 ? "S" : "", full_hostname, name); 877 } else { 878 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s", 879 failures, failures > 1 ? "S" : "", tty); 880 syslog(LOG_AUTHPRIV|LOG_NOTICE, 881 "%d LOGIN FAILURE%s ON %s, %s", 882 failures, failures > 1 ? "S" : "", tty, name); 883 } 884 } 885 886 #undef UNKNOWN 887 #define UNKNOWN "su" 888 889 char * 890 stypeof(ttyid) 891 char *ttyid; 892 { 893 struct ttyent *t; 894 return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : UNKNOWN); 895 } 896 897 void 898 sleepexit(eval) 899 int eval; 900 { 901 (void)sleep(5); 902 exit(eval); 903 } 904 905 906