usr.bin/login/login.c

   1 /*      $NetBSD: login.c,v 1.97 2009/12/29 19:26:13 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. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 __COPYRIGHT("@(#) Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994\
  35  The Regents of the University of California.  All rights reserved.");
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)login.c     8.4 (Berkeley) 4/2/94";
  41 #endif
  42 __RCSID("$NetBSD: login.c,v 1.97 2009/12/29 19:26:13 christos Exp $");
  43 #endif /* not lint */
  44
  45 /*
  46  * login [ name ]
  47  * login -h hostname    (for telnetd, etc.)
  48  * login -f name        (for pre-authenticated login: datakit, xterm, etc.)
  49  */
  50
  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 <sys/wait.h>
  57 #include <sys/socket.h>
  58
  59 #include <err.h>
  60 #include <errno.h>
  61 #include <grp.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 <time.h>
  70 #include <ttyent.h>
  71 #include <tzfile.h>
  72 #include <unistd.h>
  73 #include <sysexits.h>
  74 #ifdef SUPPORT_UTMP
  75 #include <utmp.h>
  76 #endif
  77 #ifdef SUPPORT_UTMPX
  78 #include <utmpx.h>
  79 #endif
  80 #include <util.h>
  81 #ifdef SKEY
  82 #include <skey.h>
  83 #endif
  84 #ifdef KERBEROS5
  85 #include <krb5/krb5.h>
  86 #include <com_err.h>
  87 #endif
  88 #ifdef LOGIN_CAP
  89 #include <login_cap.h>
  90 #endif
  91 #include <vis.h>
  92
  93 #include "pathnames.h"
  94 #include "common.h"
  95
  96 #ifdef KERBEROS5
  97 int login_krb5_forwardable_tgt = 0;
  98 static int login_krb5_get_tickets = 1;
  99 static int login_krb5_retain_ccache = 0;
 100 #endif
 101
 102 static void      checknologin(char *);
 103 #ifdef KERBEROS5
 104 int      k5login(struct passwd *, char *, char *, char *);
 105 void     k5destroy(void);
 106 int      k5_read_creds(char*);
 107 int      k5_write_creds(void);
 108 #endif
 109 #if defined(KERBEROS5)
 110 static void      dofork(void);
 111 #endif
 112 static void      usage(void);
 113
 114 #define TTYGRPNAME      "tty"           /* name of group to own ttys */
 115
 116 #define DEFAULT_BACKOFF 3
 117 #define DEFAULT_RETRIES 10
 118
 119 #if defined(KERBEROS5)
 120 int     has_ccache = 0;
 121 static int      notickets = 1;
 122 static char     *instance;
 123 extern krb5_context kcontext;
 124 extern int      have_forward;
 125 extern char     *krb5tkfile_env;
 126 extern int      krb5_configured;
 127 #endif
 128
 129 #if defined(KERBEROS5)
 130 #define KERBEROS_CONFIGURED     krb5_configured
 131 #endif
 132
 133 extern char **environ;
 134
 135 int
 136 main(int argc, char *argv[])
 137 {
 138         struct group *gr;
 139         struct stat st;
 140         int ask, ch, cnt, fflag, hflag, pflag, sflag, quietlog, rootlogin, rval;
 141         int Fflag;
 142         uid_t uid, saved_uid;
 143         gid_t saved_gid, saved_gids[NGROUPS_MAX];
 144         int nsaved_gids;
 145         char *domain, *p, *ttyn, *pwprompt;
 146         char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10];
 147         char localhost[MAXHOSTNAMELEN + 1];
 148         int need_chpass, require_chpass;
 149         int login_retries = DEFAULT_RETRIES,
 150             login_backoff = DEFAULT_BACKOFF;
 151         time_t pw_warntime = _PASSWORD_WARNDAYS * SECSPERDAY;
 152 #ifdef KERBEROS5
 153         krb5_error_code kerror;
 154 #endif
 155 #if defined(KERBEROS5)
 156         int got_tickets = 0;
 157 #endif
 158 #ifdef LOGIN_CAP
 159         char *shell = NULL;
 160         login_cap_t *lc = NULL;
 161 #endif
 162
 163         tbuf[0] = '\0';
 164         rval = 0;
 165         pwprompt = NULL;
 166         nested = NULL;
 167         need_chpass = require_chpass = 0;
 168
 169         (void)signal(SIGALRM, timedout);
 170         (void)alarm(timeout);
 171         (void)signal(SIGQUIT, SIG_IGN);
 172         (void)signal(SIGINT, SIG_IGN);
 173         (void)setpriority(PRIO_PROCESS, 0, 0);
 174
 175         openlog("login", 0, LOG_AUTH);
 176
 177         /*
 178          * -p is used by getty to tell login not to destroy the environment
 179          * -f is used to skip a second login authentication
 180          * -h is used by other servers to pass the name of the remote host to
 181          *    login so that it may be placed in utmp/utmpx and wtmp/wtmpx
 182          * -a in addition to -h, a server may supply -a to pass the actual
 183          *    server address.
 184          * -s is used to force use of S/Key or equivalent.
 185          */
 186         domain = NULL;
 187         if (gethostname(localhost, sizeof(localhost)) < 0)
 188                 syslog(LOG_ERR, "couldn't get local hostname: %m");
 189         else
 190                 domain = strchr(localhost, '.');
 191         localhost[sizeof(localhost) - 1] = '\0';
 192
 193         Fflag = fflag = hflag = pflag = sflag = 0;
 194         have_ss = 0;
 195 #ifdef KERBEROS5
 196         have_forward = 0;
 197 #endif
 198         uid = getuid();
 199         while ((ch = getopt(argc, argv, "a:Ffh:ps")) != -1)
 200                 switch (ch) {
 201                 case 'a':
 202                         if (uid)
 203                                 errx(EXIT_FAILURE, "-a option: %s", strerror(EPERM));
 204                         decode_ss(optarg);
 205 #ifdef notdef
 206                         (void)sockaddr_snprintf(optarg,
 207                             sizeof(struct sockaddr_storage), "%a", (void *)&ss);
 208 #endif
 209                         break;
 210                 case 'F':
 211                         Fflag = 1;
 212                         /* FALLTHROUGH */
 213                 case 'f':
 214                         fflag = 1;
 215                         break;
 216                 case 'h':
 217                         if (uid)
 218                                 errx(EXIT_FAILURE, "-h option: %s", strerror(EPERM));
 219                         hflag = 1;
 220 #ifdef notdef
 221                         if (domain && (p = strchr(optarg, '.')) != NULL &&
 222                             strcasecmp(p, domain) == 0)
 223                                 *p = '\0';
 224 #endif
 225                         hostname = optarg;
 226                         break;
 227                 case 'p':
 228                         pflag = 1;
 229                         break;
 230                 case 's':
 231                         sflag = 1;
 232                         break;
 233                 default:
 234                 case '?':
 235                         usage();
 236                         break;
 237                 }
 238
 239 #ifndef __minix
 240         setproctitle(NULL);
 241 #endif
 242         argc -= optind;
 243         argv += optind;
 244
 245         if (*argv) {
 246                 username = *argv;
 247                 ask = 0;
 248         } else
 249                 ask = 1;
 250
 251 #ifdef F_CLOSEM
 252         (void)fcntl(3, F_CLOSEM, 0);
 253 #else
 254         for (cnt = getdtablesize(); cnt > 2; cnt--)
 255                 (void)close(cnt);
 256 #endif
 257
 258         ttyn = ttyname(STDIN_FILENO);
 259         if (ttyn == NULL || *ttyn == '\0') {
 260                 (void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY);
 261                 ttyn = tname;
 262         }
 263         if ((tty = strstr(ttyn, "/pts/")) != NULL)
 264                 ++tty;
 265         else if ((tty = strrchr(ttyn, '/')) != NULL)
 266                 ++tty;
 267         else
 268                 tty = ttyn;
 269
 270         if (issetugid()) {
 271                 nested = strdup(user_from_uid(getuid(), 0));
 272                 if (nested == NULL) {
 273                         syslog(LOG_ERR, "strdup: %m");
 274                         sleepexit(EXIT_FAILURE);
 275                 }
 276         }
 277
 278 #ifdef LOGIN_CAP
 279         /* Get "login-retries" and "login-backoff" from default class */
 280         if ((lc = login_getclass(NULL)) != NULL) {
 281                 login_retries = (int)login_getcapnum(lc, "login-retries",
 282                     DEFAULT_RETRIES, DEFAULT_RETRIES);
 283                 login_backoff = (int)login_getcapnum(lc, "login-backoff",
 284                     DEFAULT_BACKOFF, DEFAULT_BACKOFF);
 285                 login_close(lc);
 286                 lc = NULL;
 287         }
 288 #endif
 289
 290 #ifdef KERBEROS5
 291         kerror = krb5_init_context(&kcontext);
 292         if (kerror) {
 293                 /*
 294                  * If Kerberos is not configured, that is, we are
 295                  * not using Kerberos, do not log the error message.
 296                  * However, if Kerberos is configured,  and the
 297                  * context init fails for some other reason, we need
 298                  * to issue a no tickets warning to the user when the
 299                  * login succeeds.
 300                  */
 301                 if (kerror != ENXIO) {  /* XXX NetBSD-local Heimdal hack */
 302                         syslog(LOG_NOTICE,
 303                             "%s when initializing Kerberos context",
 304                             error_message(kerror));
 305                         krb5_configured = 1;
 306                 }
 307                 login_krb5_get_tickets = 0;
 308         }
 309 #endif /* KERBEROS5 */
 310
 311         for (cnt = 0;; ask = 1) {
 312 #if defined(KERBEROS5)
 313                 if (login_krb5_get_tickets)
 314                         k5destroy();
 315 #endif
 316                 if (ask) {
 317                         fflag = 0;
 318                         getloginname();
 319                 }
 320                 rootlogin = 0;
 321 #ifdef KERBEROS5
 322                 if ((instance = strchr(username, '/')) != NULL)
 323                         *instance++ = '\0';
 324                 else
 325                         instance = "";
 326 #endif
 327                 if (strlen(username) > MAXLOGNAME)
 328                         username[MAXLOGNAME] = '\0';
 329
 330                 /*
 331                  * Note if trying multiple user names; log failures for
 332                  * previous user name, but don't bother logging one failure
 333                  * for nonexistent name (mistyped username).
 334                  */
 335                 if (failures && strcmp(tbuf, username)) {
 336                         if (failures > (pwd ? 0 : 1))
 337                                 badlogin(tbuf);
 338                         failures = 0;
 339                 }
 340                 (void)strlcpy(tbuf, username, sizeof(tbuf));
 341
 342                 pwd = getpwnam(username);
 343
 344 #ifdef LOGIN_CAP
 345                 /*
 346                  * Establish the class now, before we might goto
 347                  * within the next block. pwd can be NULL since it
 348                  * falls back to the "default" class if it is.
 349                  */
 350                 lc = login_getclass(pwd ? pwd->pw_class : NULL);
 351 #endif
 352                 /*
 353                  * if we have a valid account name, and it doesn't have a
 354                  * password, or the -f option was specified and the caller
 355                  * is root or the caller isn't changing their uid, don't
 356                  * authenticate.
 357                  */
 358                 if (pwd) {
 359                         if (pwd->pw_uid == 0)
 360                                 rootlogin = 1;
 361
 362                         if (fflag && (uid == 0 || uid == pwd->pw_uid)) {
 363                                 /* already authenticated */
 364 #ifdef KERBEROS5
 365                                 if (login_krb5_get_tickets && Fflag)
 366                                         k5_read_creds(username);
 367 #endif
 368                                 break;
 369                         } else if (pwd->pw_passwd[0] == '\0') {
 370                                 /* pretend password okay */
 371                                 rval = 0;
 372                                 goto ttycheck;
 373                         }
 374                 }
 375
 376                 fflag = 0;
 377
 378                 (void)setpriority(PRIO_PROCESS, 0, -4);
 379
 380 #ifdef SKEY
 381                 if (skey_haskey(username) == 0) {
 382                         static char skprompt[80];
 383                         const char *skinfo = skey_keyinfo(username);
 384
 385                         (void)snprintf(skprompt, sizeof(skprompt),
 386                             "Password [ %s ]:",
 387                             skinfo ? skinfo : "error getting challenge");
 388                         pwprompt = skprompt;
 389                 } else
 390 #endif
 391                         pwprompt = "Password:";
 392
 393                 p = getpass(pwprompt);
 394
 395                 if (pwd == NULL) {
 396                         rval = 1;
 397                         goto skip;
 398                 }
 399 #ifdef KERBEROS5
 400                 if (login_krb5_get_tickets &&
 401                     k5login(pwd, instance, localhost, p) == 0) {
 402                         rval = 0;
 403                         got_tickets = 1;
 404                 }
 405 #endif
 406 #if defined(KERBEROS5)
 407                 if (got_tickets)
 408                         goto skip;
 409 #endif
 410 #ifdef SKEY
 411                 if (skey_haskey(username) == 0 &&
 412                     skey_passcheck(username, p) != -1) {
 413                         rval = 0;
 414                         goto skip;
 415                 }
 416 #endif
 417                 if (!sflag && *pwd->pw_passwd != '\0' &&
 418                     !strcmp(crypt(p, pwd->pw_passwd), pwd->pw_passwd)) {
 419                         rval = 0;
 420                         require_chpass = 1;
 421                         goto skip;
 422                 }
 423                 rval = 1;
 424
 425         skip:
 426                 memset(p, 0, strlen(p));
 427
 428                 (void)setpriority(PRIO_PROCESS, 0, 0);
 429
 430         ttycheck:
 431                 /*
 432                  * If trying to log in as root without Kerberos,
 433                  * but with insecure terminal, refuse the login attempt.
 434                  */
 435                 if (pwd && !rval && rootlogin && !rootterm(tty)) {
 436                         (void)printf("Login incorrect or refused on this "
 437                             "terminal.\n");
 438                         if (hostname)
 439                                 syslog(LOG_NOTICE,
 440                                     "LOGIN %s REFUSED FROM %s ON TTY %s",
 441                                     pwd->pw_name, hostname, tty);
 442                         else
 443                                 syslog(LOG_NOTICE,
 444                                     "LOGIN %s REFUSED ON TTY %s",
 445                                      pwd->pw_name, tty);
 446                         continue;
 447                 }
 448
 449                 if (pwd && !rval)
 450                         break;
 451
 452                 (void)printf("Login incorrect or refused on this "
 453                     "terminal.\n");
 454                 failures++;
 455                 cnt++;
 456                 /*
 457                  * We allow login_retries tries, but after login_backoff
 458                  * we start backing off.  These default to 10 and 3
 459                  * respectively.
 460                  */
 461                 if (cnt > login_backoff) {
 462                         if (cnt >= login_retries) {
 463                                 badlogin(username);
 464                                 sleepexit(EXIT_FAILURE);
 465                         }
 466                         sleep((u_int)((cnt - login_backoff) * 5));
 467                 }
 468         }
 469
 470         /* committed to login -- turn off timeout */
 471         (void)alarm((u_int)0);
 472
 473         endpwent();
 474
 475         /* if user not super-user, check for disabled logins */
 476 #ifdef LOGIN_CAP
 477         if (!login_getcapbool(lc, "ignorenologin", rootlogin))
 478                 checknologin(login_getcapstr(lc, "nologin", NULL, NULL));
 479 #else
 480         if (!rootlogin)
 481                 checknologin(NULL);
 482 #endif
 483
 484 #ifdef LOGIN_CAP
 485         quietlog = login_getcapbool(lc, "hushlogin", 0);
 486 #else
 487         quietlog = 0;
 488 #endif
 489         /* Temporarily give up special privileges so we can change */
 490         /* into NFS-mounted homes that are exported for non-root */
 491         /* access and have mode 7x0 */
 492         saved_uid = geteuid();
 493         saved_gid = getegid();
 494         nsaved_gids = getgroups(NGROUPS_MAX, saved_gids);
 495
 496         (void)setegid(pwd->pw_gid);
 497         initgroups(username, pwd->pw_gid);
 498         (void)seteuid(pwd->pw_uid);
 499
 500         if (chdir(pwd->pw_dir) < 0) {
 501 #ifdef LOGIN_CAP
 502                 if (login_getcapbool(lc, "requirehome", 0)) {
 503                         (void)printf("Home directory %s required\n",
 504                             pwd->pw_dir);
 505                         sleepexit(EXIT_FAILURE);
 506                 }
 507 #endif
 508                 (void)printf("No home directory %s!\n", pwd->pw_dir);
 509                 if (chdir("/") == -1)
 510                         exit(EXIT_FAILURE);
 511                 pwd->pw_dir = "/";
 512                 (void)printf("Logging in with home = \"/\".\n");
 513         }
 514
 515         if (!quietlog)
 516                 quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0;
 517
 518         /* regain special privileges */
 519         (void)seteuid(saved_uid);
 520         setgroups(nsaved_gids, saved_gids);
 521         (void)setegid(saved_gid);
 522
 523 #ifdef LOGIN_CAP
 524         pw_warntime = login_getcaptime(lc, "password-warn",
 525                 _PASSWORD_WARNDAYS * SECSPERDAY,
 526                 _PASSWORD_WARNDAYS * SECSPERDAY);
 527 #endif
 528
 529         (void)gettimeofday(&now, (struct timezone *)NULL);
 530         if (pwd->pw_expire) {
 531                 if (now.tv_sec >= pwd->pw_expire) {
 532                         (void)printf("Sorry -- your account has expired.\n");
 533                         sleepexit(EXIT_FAILURE);
 534                 } else if (pwd->pw_expire - now.tv_sec < pw_warntime &&
 535                     !quietlog)
 536                         (void)printf("Warning: your account expires on %s",
 537                             ctime(&pwd->pw_expire));
 538         }
 539         if (pwd->pw_change) {
 540                 if (pwd->pw_change == _PASSWORD_CHGNOW)
 541                         need_chpass = 1;
 542                 else if (now.tv_sec >= pwd->pw_change) {
 543                         (void)printf("Sorry -- your password has expired.\n");
 544                         sleepexit(EXIT_FAILURE);
 545                 } else if (pwd->pw_change - now.tv_sec < pw_warntime &&
 546                     !quietlog)
 547                         (void)printf("Warning: your password expires on %s",
 548                             ctime(&pwd->pw_change));
 549
 550         }
 551         /* Nothing else left to fail -- really log in. */
 552         update_db(quietlog, rootlogin, fflag);
 553
 554         (void)chown(ttyn, pwd->pw_uid,
 555             (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid);
 556
 557         if (ttyaction(ttyn, "login", pwd->pw_name))
 558                 (void)printf("Warning: ttyaction failed.\n");
 559
 560 #if defined(KERBEROS5)
 561         /* Fork so that we can call kdestroy */
 562         if (! login_krb5_retain_ccache && has_ccache)
 563                 dofork();
 564 #endif
 565
 566         /* Destroy environment unless user has requested its preservation. */
 567         if (!pflag)
 568                 environ = envinit;
 569
 570 #ifdef LOGIN_CAP
 571         if (nested == NULL && setusercontext(lc, pwd, pwd->pw_uid,
 572             LOGIN_SETLOGIN) != 0) {
 573                 syslog(LOG_ERR, "setusercontext failed");
 574                 exit(EXIT_FAILURE);
 575         }
 576         if (setusercontext(lc, pwd, pwd->pw_uid,
 577             (LOGIN_SETALL & ~(LOGIN_SETPATH|LOGIN_SETLOGIN))) != 0) {
 578                 syslog(LOG_ERR, "setusercontext failed");
 579                 exit(EXIT_FAILURE);
 580         }
 581 #else
 582         (void)setgid(pwd->pw_gid);
 583
 584         initgroups(username, pwd->pw_gid);
 585
 586 #ifndef __minix
 587         if (nested == NULL && setlogin(pwd->pw_name) < 0)
 588                 syslog(LOG_ERR, "setlogin() failure: %m");
 589 #endif
 590
 591         /* Discard permissions last so can't get killed and drop core. */
 592         if (rootlogin)
 593                 (void)setuid(0);
 594         else
 595                 (void)setuid(pwd->pw_uid);
 596 #endif
 597
 598         if (*pwd->pw_shell == '\0')
 599                 pwd->pw_shell = _PATH_BSHELL;
 600 #ifdef LOGIN_CAP
 601         if ((shell = login_getcapstr(lc, "shell", NULL, NULL)) != NULL) {
 602                 if ((shell = strdup(shell)) == NULL) {
 603                         syslog(LOG_ERR, "Cannot alloc mem");
 604                         sleepexit(EXIT_FAILURE);
 605                 }
 606                 pwd->pw_shell = shell;
 607         }
 608 #endif
 609
 610         (void)setenv("HOME", pwd->pw_dir, 1);
 611         (void)setenv("SHELL", pwd->pw_shell, 1);
 612         if (term[0] == '\0') {
 613                 char *tt = (char *)stypeof(tty);
 614 #ifdef LOGIN_CAP
 615                 if (tt == NULL)
 616                         tt = login_getcapstr(lc, "term", NULL, NULL);
 617 #endif
 618                 /* unknown term -> "su" */
 619                 (void)strlcpy(term, tt != NULL ? tt : "su", sizeof(term));
 620         }
 621         (void)setenv("TERM", term, 0);
 622         (void)setenv("LOGNAME", pwd->pw_name, 1);
 623         (void)setenv("USER", pwd->pw_name, 1);
 624
 625 #ifdef LOGIN_CAP
 626         setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETPATH);
 627 #else
 628         (void)setenv("PATH", _PATH_DEFPATH, 0);
 629 #endif
 630
 631 #ifdef KERBEROS5
 632         if (krb5tkfile_env)
 633                 (void)setenv("KRB5CCNAME", krb5tkfile_env, 1);
 634 #endif
 635
 636         if (tty[sizeof("tty")-1] == 'd')
 637                 syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name);
 638
 639         /* If fflag is on, assume caller/authenticator has logged root login. */
 640         if (rootlogin && fflag == 0) {
 641                 if (hostname)
 642                         syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s",
 643                             username, tty, hostname);
 644                 else
 645                         syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s",
 646                             username, tty);
 647         }
 648
 649 #if defined(KERBEROS5)
 650         if (KERBEROS_CONFIGURED && !quietlog && notickets == 1)
 651                 (void)printf("Warning: no Kerberos tickets issued.\n");
 652 #endif
 653
 654         if (!quietlog) {
 655                 char *fname;
 656 #ifdef LOGIN_CAP
 657                 fname = login_getcapstr(lc, "copyright", NULL, NULL);
 658                 if (fname != NULL && access(fname, F_OK) == 0)
 659                         motd(fname);
 660                 else
 661 #endif
 662                         (void)printf("%s", copyrightstr);
 663
 664 #ifdef LOGIN_CAP
 665                 fname = login_getcapstr(lc, "welcome", NULL, NULL);
 666                 if (fname == NULL || access(fname, F_OK) != 0)
 667 #endif
 668                         fname = _PATH_MOTDFILE;
 669                 motd(fname);
 670
 671                 (void)snprintf(tbuf,
 672                     sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pwd->pw_name);
 673                 if (stat(tbuf, &st) == 0 && st.st_size != 0)
 674                         (void)printf("You have %smail.\n",
 675                             (st.st_mtime > st.st_atime) ? "new " : "");
 676         }
 677
 678 #ifdef LOGIN_CAP
 679         login_close(lc);
 680 #endif
 681
 682         (void)signal(SIGALRM, SIG_DFL);
 683         (void)signal(SIGQUIT, SIG_DFL);
 684         (void)signal(SIGINT, SIG_DFL);
 685         (void)signal(SIGTSTP, SIG_IGN);
 686
 687         tbuf[0] = '-';
 688         (void)strlcpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ?
 689             p + 1 : pwd->pw_shell, sizeof(tbuf) - 1);
 690
 691         /* Wait to change password until we're unprivileged */
 692         if (need_chpass) {
 693                 if (!require_chpass)
 694                         (void)printf(
 695 "Warning: your password has expired. Please change it as soon as possible.\n");
 696                 else {
 697                         int     status;
 698
 699                         (void)printf(
 700                     "Your password has expired. Please choose a new one.\n");
 701                         switch (fork()) {
 702                         case -1:
 703                                 warn("fork");
 704                                 sleepexit(EXIT_FAILURE);
 705                         case 0:
 706                                 execl(_PATH_BINPASSWD, "passwd", NULL);
 707                                 _exit(EXIT_FAILURE);
 708                         default:
 709                                 if (wait(&status) == -1 ||
 710                                     WEXITSTATUS(status))
 711                                         sleepexit(EXIT_FAILURE);
 712                         }
 713                 }
 714         }
 715
 716 #ifdef KERBEROS5
 717         if (login_krb5_get_tickets)
 718                 k5_write_creds();
 719 #endif
 720         execlp(pwd->pw_shell, tbuf, NULL);
 721         err(EXIT_FAILURE, "%s", pwd->pw_shell);
 722 }
 723
 724 #if defined(KERBEROS5)
 725 /*
 726  * This routine handles cleanup stuff, and the like.
 727  * It exists only in the child process.
 728  */
 729 static void
 730 dofork(void)
 731 {
 732         pid_t child, wchild;
 733
 734         switch (child = fork()) {
 735         case 0:
 736                 return; /* Child process */
 737         case -1:
 738                 err(EXIT_FAILURE, "Can't fork");
 739                 /*NOTREACHED*/
 740         default:
 741                 break;
 742         }
 743
 744         /*
 745          * Setup stuff?  This would be things we could do in parallel
 746          * with login
 747          */
 748         if (chdir("/") == -1)   /* Let's not keep the fs busy... */
 749                 err(EXIT_FAILURE, "Can't chdir to `/'");
 750
 751         /* If we're the parent, watch the child until it dies */
 752         while ((wchild = wait(NULL)) != child)
 753                 if (wchild == -1)
 754                         err(EXIT_FAILURE, "Can't wait");
 755
 756         /* Cleanup stuff */
 757         /* Run kdestroy to destroy tickets */
 758         if (login_krb5_get_tickets)
 759                 k5destroy();
 760
 761         /* Leave */
 762         exit(EXIT_SUCCESS);
 763 }
 764 #endif
 765
 766 static void
 767 checknologin(char *fname)
 768 {
 769         int fd, nchars;
 770         char tbuf[8192];
 771
 772         if ((fd = open(fname ? fname : _PATH_NOLOGIN, O_RDONLY, 0)) >= 0) {
 773                 while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0)
 774                         (void)write(fileno(stdout), tbuf, nchars);
 775                 sleepexit(EXIT_SUCCESS);
 776         }
 777 }
 778
 779 static void
 780 usage(void)
 781 {
 782         (void)fprintf(stderr,
 783             "Usage: %s [-Ffps] [-a address] [-h hostname] [username]\n",
 784             getprogname());
 785         exit(EXIT_FAILURE);
 786 }