login_pam.c revision 1.4.2.4.2.1
1 /* $NetBSD: login_pam.c,v 1.4.2.4.2.1 2006/03/09 16:54:20 tron 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( 35 "@(#) Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994\n\ 36 The Regents of the University of California. All rights reserved.\n"); 37 #endif /* not lint */ 38 39 #ifndef lint 40 #if 0 41 static char sccsid[] = "@(#)login.c 8.4 (Berkeley) 4/2/94"; 42 #endif 43 __RCSID("$NetBSD: login_pam.c,v 1.4.2.4.2.1 2006/03/09 16:54:20 tron Exp $"); 44 #endif /* not lint */ 45 46 /* 47 * login [ name ] 48 * login -h hostname (for telnetd, etc.) 49 * login -f name (for pre-authenticated login: datakit, xterm, etc.) 50 */ 51 52 #include <sys/param.h> 53 #include <sys/stat.h> 54 #include <sys/time.h> 55 #include <sys/resource.h> 56 #include <sys/file.h> 57 #include <sys/wait.h> 58 #include <sys/socket.h> 59 60 #include <err.h> 61 #include <errno.h> 62 #include <grp.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 <time.h> 71 #include <ttyent.h> 72 #include <tzfile.h> 73 #include <unistd.h> 74 #include <util.h> 75 #include <login_cap.h> 76 #include <vis.h> 77 78 #include <security/pam_appl.h> 79 #include <security/openpam.h> 80 81 #include "pathnames.h" 82 83 void badlogin (char *); 84 static void update_db (int); 85 void getloginname (void); 86 int main (int, char *[]); 87 void motd (char *); 88 int rootterm (char *); 89 void sigint (int); 90 void sleepexit (int); 91 const char *stypeof (const char *); 92 void timedout (int); 93 void decode_ss (const char *); 94 void usage (void); 95 96 static struct pam_conv pamc = { openpam_ttyconv, NULL }; 97 98 #define TTYGRPNAME "tty" /* name of group to own ttys */ 99 100 #define DEFAULT_BACKOFF 3 101 #define DEFAULT_RETRIES 10 102 103 /* 104 * This bounds the time given to login. Not a define so it can 105 * be patched on machines where it's too small. 106 */ 107 u_int timeout = 300; 108 109 struct passwd *pwd, pwres; 110 char pwbuf[1024]; 111 struct group *gr; 112 int failures, have_ss; 113 char term[64], *envinit[1], *hostname, *username, *tty, *nested; 114 struct timeval now; 115 struct sockaddr_storage ss; 116 117 extern const char copyrightstr[]; 118 119 int 120 main(int argc, char *argv[]) 121 { 122 extern char **environ; 123 struct stat st; 124 int ask, ch, cnt, fflag, hflag, pflag, sflag, quietlog, rootlogin; 125 int auth_passed; 126 int Fflag; 127 uid_t uid, saved_uid; 128 gid_t saved_gid, saved_gids[NGROUPS_MAX]; 129 int nsaved_gids; 130 char *domain, *p, *ttyn, *pwprompt; 131 char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10]; 132 char localhost[MAXHOSTNAMELEN + 1]; 133 int need_chpass, require_chpass; 134 int login_retries = DEFAULT_RETRIES, 135 login_backoff = DEFAULT_BACKOFF; 136 char *shell = NULL; 137 login_cap_t *lc = NULL; 138 pam_handle_t *pamh = NULL; 139 int pam_err; 140 void *oint; 141 void *oabrt; 142 const void *newuser; 143 int pam_silent = PAM_SILENT; 144 pid_t xpid, pid; 145 int status; 146 char *saved_term; 147 char **pamenv; 148 149 tbuf[0] = '\0'; 150 pwprompt = NULL; 151 nested = NULL; 152 need_chpass = require_chpass = 0; 153 154 (void)signal(SIGALRM, timedout); 155 (void)alarm(timeout); 156 (void)signal(SIGQUIT, SIG_IGN); 157 (void)signal(SIGINT, SIG_IGN); 158 (void)setpriority(PRIO_PROCESS, 0, 0); 159 160 openlog("login", 0, LOG_AUTH); 161 162 /* 163 * -p is used by getty to tell login not to destroy the environment 164 * -f is used to skip a second login authentication 165 * -h is used by other servers to pass the name of the remote host to 166 * login so that it may be placed in utmp/utmpx and wtmp/wtmpx 167 * -a in addition to -h, a server my supply -a to pass the actual 168 * server address. 169 * -s is used to force use of S/Key or equivalent. 170 */ 171 domain = NULL; 172 if (gethostname(localhost, sizeof(localhost)) < 0) 173 syslog(LOG_ERR, "couldn't get local hostname: %m"); 174 else 175 domain = strchr(localhost, '.'); 176 localhost[sizeof(localhost) - 1] = '\0'; 177 178 Fflag = fflag = hflag = pflag = sflag = 0; 179 have_ss = 0; 180 uid = getuid(); 181 while ((ch = getopt(argc, argv, "a:Ffh:ps")) != -1) 182 switch (ch) { 183 case 'a': 184 if (uid) { 185 errno = EPERM; 186 err(EXIT_FAILURE, "-a option"); 187 } 188 decode_ss(optarg); 189 #ifdef notdef 190 (void)sockaddr_snprintf(optarg, 191 sizeof(struct sockaddr_storage), "%a", (void *)&ss); 192 #endif 193 break; 194 case 'F': 195 Fflag = 1; 196 /* FALLTHROUGH */ 197 case 'f': 198 fflag = 1; 199 break; 200 case 'h': 201 if (uid) { 202 errno = EPERM; 203 err(EXIT_FAILURE, "-h option"); 204 } 205 hflag = 1; 206 if (domain && (p = strchr(optarg, '.')) != NULL && 207 strcasecmp(p, domain) == 0) 208 *p = '\0'; 209 hostname = optarg; 210 break; 211 case 'p': 212 pflag = 1; 213 break; 214 case 's': 215 sflag = 1; 216 break; 217 default: 218 case '?': 219 usage(); 220 break; 221 } 222 223 setproctitle(NULL); 224 argc -= optind; 225 argv += optind; 226 227 if (*argv) { 228 username = *argv; 229 ask = 0; 230 } else 231 ask = 1; 232 233 #ifdef F_CLOSEM 234 (void)fcntl(3, F_CLOSEM, 0); 235 #else 236 for (cnt = getdtablesize(); cnt > 2; cnt--) 237 (void)close(cnt); 238 #endif 239 240 ttyn = ttyname(STDIN_FILENO); 241 if (ttyn == NULL || *ttyn == '\0') { 242 (void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY); 243 ttyn = tname; 244 } 245 if ((tty = strstr(ttyn, "/pts/")) != NULL) 246 ++tty; 247 else if ((tty = strrchr(ttyn, '/')) != NULL) 248 ++tty; 249 else 250 tty = ttyn; 251 252 if (issetugid()) { 253 nested = strdup(user_from_uid(getuid(), 0)); 254 if (nested == NULL) { 255 syslog(LOG_ERR, "strdup: %m"); 256 sleepexit(EXIT_FAILURE); 257 } 258 } 259 260 /* Get "login-retries" and "login-backoff" from default class */ 261 if ((lc = login_getclass(NULL)) != NULL) { 262 login_retries = (int)login_getcapnum(lc, "login-retries", 263 DEFAULT_RETRIES, DEFAULT_RETRIES); 264 login_backoff = (int)login_getcapnum(lc, "login-backoff", 265 DEFAULT_BACKOFF, DEFAULT_BACKOFF); 266 login_close(lc); 267 lc = NULL; 268 } 269 270 271 for (cnt = 0;; ask = 1) { 272 if (ask) { 273 fflag = 0; 274 getloginname(); 275 } 276 rootlogin = 0; 277 auth_passed = 0; 278 if (strlen(username) > MAXLOGNAME) 279 username[MAXLOGNAME] = '\0'; 280 281 /* 282 * Note if trying multiple user names; log failures for 283 * previous user name, but don't bother logging one failure 284 * for nonexistent name (mistyped username). 285 */ 286 if (failures && strcmp(tbuf, username)) { 287 if (failures > (pwd ? 0 : 1)) 288 badlogin(tbuf); 289 failures = 0; 290 } 291 292 #define PAM_END(msg) do { \ 293 syslog(LOG_ERR, "%s: %s", msg, pam_strerror(pamh, pam_err)); \ 294 warnx("%s: %s", msg, pam_strerror(pamh, pam_err)); \ 295 pam_end(pamh, pam_err); \ 296 sleepexit(EXIT_FAILURE); \ 297 } while (/*CONSTCOND*/0) 298 299 pam_err = pam_start("login", username, &pamc, &pamh); 300 if (pam_err != PAM_SUCCESS) { 301 if (pamh != NULL) 302 PAM_END("pam_start"); 303 /* Things went really bad... */ 304 syslog(LOG_ERR, "pam_start failed: %s", 305 pam_strerror(pamh, pam_err)); 306 errx(EXIT_FAILURE, "pam_start failed"); 307 } 308 309 #define PAM_SET_ITEM(item, var) do { \ 310 pam_err = pam_set_item(pamh, (item), (var)); \ 311 if (pam_err != PAM_SUCCESS) \ 312 PAM_END("pam_set_item(" # item ")"); \ 313 } while (/*CONSTCOND*/0) 314 315 /* 316 * Fill hostname tty, and nested user 317 */ 318 PAM_SET_ITEM(PAM_RHOST, hostname); 319 PAM_SET_ITEM(PAM_TTY, tty); 320 if (nested) 321 PAM_SET_ITEM(PAM_NUSER, nested); 322 if (have_ss) 323 PAM_SET_ITEM(PAM_SOCKADDR, &ss); 324 325 /* 326 * Don't check for errors, because we don't want to give 327 * out any information. 328 */ 329 pwd = NULL; 330 (void)getpwnam_r(username, &pwres, pwbuf, sizeof(pwbuf), &pwd); 331 332 /* 333 * Establish the class now, before we might goto 334 * within the next block. pwd can be NULL since it 335 * falls back to the "default" class if it is. 336 */ 337 lc = login_getclass(pwd ? pwd->pw_class : NULL); 338 339 /* 340 * if we have a valid account name, and it doesn't have a 341 * password, or the -f option was specified and the caller 342 * is root or the caller isn't changing their uid, don't 343 * authenticate. 344 */ 345 if (pwd) { 346 if (pwd->pw_uid == 0) 347 rootlogin = 1; 348 349 if (fflag && (uid == 0 || uid == pwd->pw_uid)) { 350 /* already authenticated */ 351 auth_passed = 1; 352 goto skip_auth; 353 } 354 } 355 356 (void)setpriority(PRIO_PROCESS, 0, -4); 357 358 switch(pam_err = pam_authenticate(pamh, pam_silent)) { 359 case PAM_SUCCESS: 360 /* 361 * PAM can change the user, refresh 362 * username, pwd, and lc. 363 */ 364 pam_err = pam_get_item(pamh, PAM_USER, &newuser); 365 if (pam_err != PAM_SUCCESS) 366 PAM_END("pam_get_item(PAM_USER)"); 367 368 username = (char *)newuser; 369 /* 370 * Don't check for errors, because we don't want to give 371 * out any information. 372 */ 373 pwd = NULL; 374 (void)getpwnam_r(username, &pwres, pwbuf, sizeof(pwbuf), 375 &pwd); 376 lc = login_getpwclass(pwd); 377 auth_passed = 1; 378 379 switch (pam_err = pam_acct_mgmt(pamh, pam_silent)) { 380 case PAM_SUCCESS: 381 break; 382 383 case PAM_NEW_AUTHTOK_REQD: 384 pam_err = pam_chauthtok(pamh, 385 pam_silent|PAM_CHANGE_EXPIRED_AUTHTOK); 386 387 if (pam_err != PAM_SUCCESS) 388 PAM_END("pam_chauthtok"); 389 break; 390 391 case PAM_AUTH_ERR: 392 case PAM_USER_UNKNOWN: 393 case PAM_MAXTRIES: 394 auth_passed = 0; 395 break; 396 397 default: 398 PAM_END("pam_acct_mgmt"); 399 break; 400 } 401 break; 402 403 case PAM_AUTH_ERR: 404 case PAM_USER_UNKNOWN: 405 case PAM_MAXTRIES: 406 auth_passed = 0; 407 break; 408 409 default: 410 PAM_END("pam_authenticate"); 411 break; 412 } 413 414 (void)setpriority(PRIO_PROCESS, 0, 0); 415 416 skip_auth: 417 /* 418 * If the user exists and authentication passed, 419 * get out of the loop and login the user. 420 */ 421 if (pwd && auth_passed) 422 break; 423 424 (void)printf("Login incorrect or refused on this terminal.\n"); 425 failures++; 426 cnt++; 427 /* we allow 10 tries, but after 3 we start backing off */ 428 if (cnt > login_backoff) { 429 if (cnt >= login_retries) { 430 badlogin(username); 431 pam_end(pamh, PAM_SUCCESS); 432 sleepexit(EXIT_FAILURE); 433 } 434 sleep((u_int)((cnt - 3) * 5)); 435 } 436 } 437 438 /* committed to login -- turn off timeout */ 439 (void)alarm((u_int)0); 440 441 endpwent(); 442 443 quietlog = login_getcapbool(lc, "hushlogin", 0); 444 445 /* 446 * Temporarily give up special privileges so we can change 447 * into NFS-mounted homes that are exported for non-root 448 * access and have mode 7x0 449 */ 450 saved_uid = geteuid(); 451 saved_gid = getegid(); 452 nsaved_gids = getgroups(NGROUPS_MAX, saved_gids); 453 454 (void)setegid(pwd->pw_gid); 455 initgroups(username, pwd->pw_gid); 456 (void)seteuid(pwd->pw_uid); 457 458 if (chdir(pwd->pw_dir) != 0) { 459 if (login_getcapbool(lc, "requirehome", 0)) { 460 (void)printf("Home directory %s required\n", 461 pwd->pw_dir); 462 pam_end(pamh, PAM_SUCCESS); 463 exit(EXIT_FAILURE); 464 } 465 466 (void)printf("No home directory %s!\n", pwd->pw_dir); 467 if (chdir("/")) { 468 pam_end(pamh, PAM_SUCCESS); 469 exit(EXIT_SUCCESS); 470 } 471 pwd->pw_dir = "/"; 472 (void)printf("Logging in with home = \"/\".\n"); 473 } 474 475 if (!quietlog) { 476 quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0; 477 pam_silent = 0; 478 } 479 480 /* regain special privileges */ 481 setegid(saved_gid); 482 setgroups(nsaved_gids, saved_gids); 483 seteuid(saved_uid); 484 485 (void)chown(ttyn, pwd->pw_uid, 486 (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid); 487 488 if (ttyaction(ttyn, "login", pwd->pw_name)) 489 (void)printf("Warning: ttyaction failed.\n"); 490 491 /* Nothing else left to fail -- really log in. */ 492 update_db(quietlog); 493 494 if (nested == NULL && setusercontext(lc, pwd, pwd->pw_uid, 495 LOGIN_SETLOGIN) != 0) { 496 syslog(LOG_ERR, "setusercontext failed"); 497 pam_end(pamh, PAM_SUCCESS); 498 exit(EXIT_FAILURE); 499 } 500 501 if (tty[sizeof("tty")-1] == 'd') 502 syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name); 503 504 /* If fflag is on, assume caller/authenticator has logged root login. */ 505 if (rootlogin && fflag == 0) { 506 if (hostname) 507 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s", 508 username, tty, hostname); 509 else 510 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", 511 username, tty); 512 } 513 514 /* 515 * Establish groups 516 */ 517 if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETGROUP) != 0) { 518 syslog(LOG_ERR, "setusercontext failed"); 519 pam_end(pamh, PAM_SUCCESS); 520 exit(EXIT_FAILURE); 521 } 522 523 pam_err = pam_setcred(pamh, pam_silent|PAM_ESTABLISH_CRED); 524 if (pam_err != PAM_SUCCESS) 525 PAM_END("pam_setcred"); 526 527 pam_err = pam_open_session(pamh, pam_silent); 528 if (pam_err != PAM_SUCCESS) 529 PAM_END("pam_open_session"); 530 531 /* 532 * Fork because we need to call pam_closesession as root. 533 * Make sure signals cannot kill the parent. 534 * This is copied from crontab(8), which has to 535 * cope with a similar situation. 536 */ 537 oint = signal(SIGINT, SIG_IGN); 538 oabrt = signal(SIGABRT, SIG_IGN); 539 540 switch(pid = fork()) { 541 case -1: 542 pam_err = pam_close_session(pamh, 0); 543 if (pam_err != PAM_SUCCESS) { 544 syslog(LOG_ERR, "pam_close_session: %s", 545 pam_strerror(pamh, pam_err)); 546 warnx("pam_close_session: %s", 547 pam_strerror(pamh, pam_err)); 548 } 549 syslog(LOG_ERR, "fork failed: %m"); 550 warn("fork failed"); 551 pam_end(pamh, pam_err); 552 exit(EXIT_FAILURE); 553 break; 554 555 case 0: /* Child */ 556 break; 557 558 default: 559 /* 560 * Parent: wait for the child to terminate 561 * and call pam_close_session. 562 */ 563 if ((xpid = waitpid(pid, &status, 0)) != pid) { 564 pam_err = pam_close_session(pamh, 0); 565 if (pam_err != PAM_SUCCESS) { 566 syslog(LOG_ERR, 567 "pam_close_session: %s", 568 pam_strerror(pamh, pam_err)); 569 warnx("pam_close_session: %s", 570 pam_strerror(pamh, pam_err)); 571 } 572 pam_end(pamh, pam_err); 573 if (xpid != -1) 574 warnx("wrong PID: %d != %d", pid, xpid); 575 else 576 warn("wait for pid %d failed", pid); 577 exit(EXIT_FAILURE); 578 } 579 580 (void)signal(SIGINT, oint); 581 (void)signal(SIGABRT, oabrt); 582 if ((pam_err = pam_close_session(pamh, 0)) != PAM_SUCCESS) { 583 syslog(LOG_ERR, "pam_close_session: %s", 584 pam_strerror(pamh, pam_err)); 585 warnx("pam_close_session: %s", 586 pam_strerror(pamh, pam_err)); 587 } 588 pam_end(pamh, PAM_SUCCESS); 589 exit(EXIT_SUCCESS); 590 break; 591 } 592 593 /* 594 * The child: starting here, we don't have to care about 595 * handling PAM issues if we exit, the parent will do the 596 * job when we exit. 597 * 598 * Destroy environment unless user has requested its preservation. 599 * Try to preserve TERM anyway. 600 */ 601 saved_term = getenv("TERM"); 602 if (!pflag) { 603 environ = envinit; 604 if (saved_term) 605 setenv("TERM", saved_term, 0); 606 } 607 608 if (*pwd->pw_shell == '\0') 609 pwd->pw_shell = _PATH_BSHELL; 610 611 shell = login_getcapstr(lc, "shell", pwd->pw_shell, pwd->pw_shell); 612 if (*shell == '\0') 613 shell = pwd->pw_shell; 614 615 if ((pwd->pw_shell = strdup(shell)) == NULL) { 616 syslog(LOG_ERR, "Cannot alloc mem"); 617 exit(EXIT_FAILURE); 618 } 619 620 (void)setenv("HOME", pwd->pw_dir, 1); 621 (void)setenv("SHELL", pwd->pw_shell, 1); 622 if (term[0] == '\0') { 623 char *tt = (char *)stypeof(tty); 624 625 if (tt == NULL) 626 tt = login_getcapstr(lc, "term", NULL, NULL); 627 628 /* unknown term -> "su" */ 629 (void)strlcpy(term, tt != NULL ? tt : "su", sizeof(term)); 630 } 631 (void)setenv("TERM", term, 0); 632 (void)setenv("LOGNAME", pwd->pw_name, 1); 633 (void)setenv("USER", pwd->pw_name, 1); 634 635 /* 636 * Add PAM environement 637 */ 638 if ((pamenv = pam_getenvlist(pamh)) != NULL) { 639 char **envitem; 640 641 for (envitem = pamenv; *envitem; envitem++) { 642 putenv(*envitem); 643 free(*envitem); 644 } 645 646 free(pamenv); 647 } 648 649 /* This drops root privs */ 650 if (setusercontext(lc, pwd, pwd->pw_uid, 651 (LOGIN_SETALL & ~LOGIN_SETLOGIN)) != 0) { 652 syslog(LOG_ERR, "setusercontext failed"); 653 exit(EXIT_FAILURE); 654 } 655 656 if (!quietlog) { 657 char *fname; 658 659 fname = login_getcapstr(lc, "copyright", NULL, NULL); 660 if (fname != NULL && access(fname, F_OK) == 0) 661 motd(fname); 662 else 663 (void)printf("%s", copyrightstr); 664 665 fname = login_getcapstr(lc, "welcome", NULL, NULL); 666 if (fname == NULL || access(fname, F_OK) != 0) 667 fname = _PATH_MOTDFILE; 668 motd(fname); 669 670 (void)snprintf(tbuf, 671 sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pwd->pw_name); 672 if (stat(tbuf, &st) == 0 && st.st_size != 0) 673 (void)printf("You have %smail.\n", 674 (st.st_mtime > st.st_atime) ? "new " : ""); 675 } 676 677 login_close(lc); 678 679 (void)signal(SIGALRM, SIG_DFL); 680 (void)signal(SIGQUIT, SIG_DFL); 681 (void)signal(SIGINT, SIG_DFL); 682 (void)signal(SIGTSTP, SIG_IGN); 683 684 tbuf[0] = '-'; 685 (void)strlcpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ? 686 p + 1 : pwd->pw_shell, sizeof(tbuf) - 1); 687 688 execlp(pwd->pw_shell, tbuf, NULL); 689 err(EXIT_FAILURE, "%s", pwd->pw_shell); 690 } 691 692 #define NBUFSIZ (MAXLOGNAME + 1) 693 694 695 void 696 getloginname(void) 697 { 698 int ch; 699 char *p; 700 static char nbuf[NBUFSIZ]; 701 702 for (;;) { 703 (void)printf("login: "); 704 for (p = nbuf; (ch = getchar()) != '\n'; ) { 705 if (ch == EOF) { 706 badlogin(username); 707 exit(EXIT_SUCCESS); 708 } 709 if (p < nbuf + (NBUFSIZ - 1)) 710 *p++ = ch; 711 } 712 if (p > nbuf) { 713 if (nbuf[0] == '-') 714 (void)fprintf(stderr, 715 "login names may not start with '-'.\n"); 716 else { 717 *p = '\0'; 718 username = nbuf; 719 break; 720 } 721 } 722 } 723 } 724 725 int 726 rootterm(char *ttyn) 727 { 728 struct ttyent *t; 729 730 return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE); 731 } 732 733 jmp_buf motdinterrupt; 734 735 void 736 motd(char *fname) 737 { 738 int fd, nchars; 739 sig_t oldint; 740 char tbuf[8192]; 741 742 if ((fd = open(fname ? fname : _PATH_MOTDFILE, O_RDONLY, 0)) < 0) 743 return; 744 oldint = signal(SIGINT, sigint); 745 if (setjmp(motdinterrupt) == 0) 746 while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0) 747 (void)write(fileno(stdout), tbuf, nchars); 748 (void)signal(SIGINT, oldint); 749 (void)close(fd); 750 } 751 752 /* ARGSUSED */ 753 void 754 sigint(int signo) 755 { 756 757 longjmp(motdinterrupt, 1); 758 } 759 760 /* ARGSUSED */ 761 void 762 timedout(int signo) 763 { 764 765 (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout); 766 exit(EXIT_SUCCESS); 767 } 768 769 static void 770 update_db(int quietlog) 771 { 772 if (nested != NULL) { 773 if (hostname != NULL) 774 syslog(LOG_NOTICE, "%s to %s on tty %s from %s", 775 nested, pwd->pw_name, tty, hostname); 776 else 777 syslog(LOG_NOTICE, "%s to %s on tty %s", nested, 778 pwd->pw_name, tty); 779 780 } 781 if (hostname != NULL && have_ss == 0) { 782 socklen_t len = sizeof(ss); 783 (void)getpeername(STDIN_FILENO, (struct sockaddr *)&ss, &len); 784 } 785 (void)gettimeofday(&now, NULL); 786 } 787 788 void 789 badlogin(char *name) 790 { 791 792 if (failures == 0) 793 return; 794 if (hostname) { 795 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s", 796 failures, failures > 1 ? "S" : "", hostname); 797 syslog(LOG_AUTHPRIV|LOG_NOTICE, 798 "%d LOGIN FAILURE%s FROM %s, %s", 799 failures, failures > 1 ? "S" : "", hostname, name); 800 } else { 801 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s", 802 failures, failures > 1 ? "S" : "", tty); 803 syslog(LOG_AUTHPRIV|LOG_NOTICE, 804 "%d LOGIN FAILURE%s ON %s, %s", 805 failures, failures > 1 ? "S" : "", tty, name); 806 } 807 } 808 809 const char * 810 stypeof(const char *ttyid) 811 { 812 struct ttyent *t; 813 814 return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : NULL); 815 } 816 817 void 818 sleepexit(int eval) 819 { 820 821 (void)sleep(5); 822 exit(eval); 823 } 824 825 void 826 decode_ss(const char *arg) 827 { 828 struct sockaddr_storage *ssp; 829 size_t len = strlen(arg); 830 831 if (len > sizeof(*ssp) * 4 + 1 || len < sizeof(*ssp)) 832 errx(EXIT_FAILURE, "Bad argument"); 833 834 if ((ssp = malloc(len)) == NULL) 835 err(EXIT_FAILURE, NULL); 836 837 if (strunvis((char *)ssp, arg) != sizeof(*ssp)) 838 errx(EXIT_FAILURE, "Decoding error"); 839 840 (void)memcpy(&ss, ssp, sizeof(ss)); 841 have_ss = 1; 842 } 843 844 void 845 usage(void) 846 { 847 (void)fprintf(stderr, 848 "Usage: %s [-Ffps] [-a address] [-h hostname] [username]\n", 849 getprogname()); 850 exit(EXIT_FAILURE); 851 } 852
Indexes created Wed Oct 22 13:09:56 GMT 2025