login_pam.c revision 1.3
1 /* $NetBSD: login_pam.c,v 1.3 2005/02/28 16:11:36 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( 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 1.3 2005/02/28 16:11:36 christos 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; 110 struct group *gr; 111 int failures, have_ss; 112 char term[64], *envinit[1], *hostname, *username, *tty, *nested; 113 struct timeval now; 114 struct sockaddr_storage ss; 115 116 extern const char copyrightstr[]; 117 118 int 119 main(int argc, char *argv[]) 120 { 121 extern char **environ; 122 struct stat st; 123 int ask, ch, cnt, fflag, hflag, pflag, sflag, quietlog, rootlogin; 124 int auth_passed; 125 int Fflag; 126 uid_t uid, saved_uid; 127 gid_t saved_gid, saved_gids[NGROUPS_MAX]; 128 int nsaved_gids; 129 char *domain, *p, *ttyn, *pwprompt; 130 char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10]; 131 char localhost[MAXHOSTNAMELEN + 1]; 132 int need_chpass, require_chpass; 133 int login_retries = DEFAULT_RETRIES, 134 login_backoff = DEFAULT_BACKOFF; 135 char *shell = NULL; 136 login_cap_t *lc = NULL; 137 pam_handle_t *pamh = NULL; 138 int pam_err; 139 void *oint; 140 void *oabrt; 141 const void *newuser; 142 int pam_silent = PAM_SILENT; 143 pid_t xpid, pid; 144 int status; 145 char *saved_term; 146 char **pamenv; 147 148 tbuf[0] = '\0'; 149 pwprompt = NULL; 150 nested = NULL; 151 need_chpass = require_chpass = 0; 152 153 (void)signal(SIGALRM, timedout); 154 (void)alarm(timeout); 155 (void)signal(SIGQUIT, SIG_IGN); 156 (void)signal(SIGINT, SIG_IGN); 157 (void)setpriority(PRIO_PROCESS, 0, 0); 158 159 openlog("login", 0, LOG_AUTH); 160 161 /* 162 * -p is used by getty to tell login not to destroy the environment 163 * -f is used to skip a second login authentication 164 * -h is used by other servers to pass the name of the remote host to 165 * login so that it may be placed in utmp/utmpx and wtmp/wtmpx 166 * -a in addition to -h, a server my supply -a to pass the actual 167 * server address. 168 * -s is used to force use of S/Key or equivalent. 169 */ 170 domain = NULL; 171 if (gethostname(localhost, sizeof(localhost)) < 0) 172 syslog(LOG_ERR, "couldn't get local hostname: %m"); 173 else 174 domain = strchr(localhost, '.'); 175 localhost[sizeof(localhost) - 1] = '\0'; 176 177 Fflag = fflag = hflag = pflag = sflag = 0; 178 have_ss = 0; 179 uid = getuid(); 180 while ((ch = getopt(argc, argv, "a:Ffh:ps")) != -1) 181 switch (ch) { 182 case 'a': 183 if (uid) 184 errx(1, "-a option: %s", strerror(EPERM)); 185 decode_ss(optarg); 186 #ifdef notdef 187 (void)sockaddr_snprintf(optarg, 188 sizeof(struct sockaddr_storage), "%a", (void *)&ss); 189 #endif 190 break; 191 case 'F': 192 Fflag = 1; 193 /* FALLTHROUGH */ 194 case 'f': 195 fflag = 1; 196 break; 197 case 'h': 198 if (uid) 199 errx(1, "-h option: %s", strerror(EPERM)); 200 hflag = 1; 201 if (domain && (p = strchr(optarg, '.')) != NULL && 202 strcasecmp(p, domain) == 0) 203 *p = '\0'; 204 hostname = optarg; 205 break; 206 case 'p': 207 pflag = 1; 208 break; 209 case 's': 210 sflag = 1; 211 break; 212 default: 213 case '?': 214 usage(); 215 break; 216 } 217 218 setproctitle(NULL); 219 argc -= optind; 220 argv += optind; 221 222 if (*argv) { 223 username = *argv; 224 ask = 0; 225 } else 226 ask = 1; 227 228 #ifdef F_CLOSEM 229 (void)fcntl(3, F_CLOSEM, 0); 230 #else 231 for (cnt = getdtablesize(); cnt > 2; cnt--) 232 (void)close(cnt); 233 #endif 234 235 ttyn = ttyname(STDIN_FILENO); 236 if (ttyn == NULL || *ttyn == '\0') { 237 (void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY); 238 ttyn = tname; 239 } 240 if ((tty = strstr(ttyn, "/pts/")) != NULL) 241 ++tty; 242 else if ((tty = strrchr(ttyn, '/')) != NULL) 243 ++tty; 244 else 245 tty = ttyn; 246 247 if (issetugid()) { 248 nested = strdup(user_from_uid(getuid(), 0)); 249 if (nested == NULL) { 250 syslog(LOG_ERR, "strdup: %m"); 251 sleepexit(1); 252 } 253 } 254 255 /* Get "login-retries" and "login-backoff" from default class */ 256 if ((lc = login_getclass(NULL)) != NULL) { 257 login_retries = (int)login_getcapnum(lc, "login-retries", 258 DEFAULT_RETRIES, DEFAULT_RETRIES); 259 login_backoff = (int)login_getcapnum(lc, "login-backoff", 260 DEFAULT_BACKOFF, DEFAULT_BACKOFF); 261 login_close(lc); 262 lc = NULL; 263 } 264 265 266 for (cnt = 0;; ask = 1) { 267 if (ask) { 268 fflag = 0; 269 getloginname(); 270 } 271 rootlogin = 0; 272 auth_passed = 0; 273 if (strlen(username) > MAXLOGNAME) 274 username[MAXLOGNAME] = '\0'; 275 276 /* 277 * Note if trying multiple user names; log failures for 278 * previous user name, but don't bother logging one failure 279 * for nonexistent name (mistyped username). 280 */ 281 if (failures && strcmp(tbuf, username)) { 282 if (failures > (pwd ? 0 : 1)) 283 badlogin(tbuf); 284 failures = 0; 285 } 286 287 #define PAM_END(msg) do { \ 288 syslog(LOG_ERR, "%s: %s", msg, pam_strerror(pamh, pam_err)); \ 289 warnx("%s: %s", msg, pam_strerror(pamh, pam_err)); \ 290 pam_end(pamh, pam_err); \ 291 sleepexit(1); \ 292 } while (/*CONSTCOND*/0) 293 294 pam_err = pam_start("login", username, &pamc, &pamh); 295 if (pam_err != PAM_SUCCESS) { 296 if (pamh != NULL) 297 PAM_END("pam_start"); 298 /* Things went really bad... */ 299 syslog(LOG_ERR, "pam_start failed: %s", 300 pam_strerror(pamh, pam_err)); 301 errx(1, "pam_start failed"); 302 } 303 304 #define PAM_SET_ITEM(item, var) do { \ 305 pam_err = pam_set_item(pamh, (item), (var)); \ 306 if (pam_err != PAM_SUCCESS) \ 307 PAM_END("pam_set_item(" # item ")"); \ 308 } while (/*CONSTCOND*/0) 309 310 /* 311 * Fill hostname and tty 312 */ 313 PAM_SET_ITEM(PAM_RHOST, hostname); 314 PAM_SET_ITEM(PAM_TTY, tty); 315 if (have_ss) 316 PAM_SET_ITEM(PAM_SOCKADDR, &ss); 317 318 pwd = getpwnam(username); 319 320 /* 321 * Establish the class now, before we might goto 322 * within the next block. pwd can be NULL since it 323 * falls back to the "default" class if it is. 324 */ 325 lc = login_getclass(pwd ? pwd->pw_class : NULL); 326 327 /* 328 * if we have a valid account name, and it doesn't have a 329 * password, or the -f option was specified and the caller 330 * is root or the caller isn't changing their uid, don't 331 * authenticate. 332 */ 333 if (pwd) { 334 if (pwd->pw_uid == 0) 335 rootlogin = 1; 336 337 if (fflag && (uid == 0 || uid == pwd->pw_uid)) { 338 /* already authenticated */ 339 auth_passed = 1; 340 goto skip_auth; 341 } 342 } 343 344 (void)setpriority(PRIO_PROCESS, 0, -4); 345 346 switch(pam_err = pam_authenticate(pamh, pam_silent)) { 347 case PAM_SUCCESS: 348 /* 349 * PAM can change the user, refresh 350 * username, pwd, and lc. 351 */ 352 pam_err = pam_get_item(pamh, PAM_USER, &newuser); 353 if (pam_err != PAM_SUCCESS) 354 PAM_END("pam_get_item(PAM_USER)"); 355 356 username = (char *)newuser; 357 pwd = getpwnam(username); 358 lc = login_getpwclass(pwd); 359 auth_passed = 1; 360 361 switch (pam_err = pam_acct_mgmt(pamh, pam_silent)) { 362 case PAM_SUCCESS: 363 break; 364 365 case PAM_NEW_AUTHTOK_REQD: 366 pam_err = pam_chauthtok(pamh, 367 pam_silent|PAM_CHANGE_EXPIRED_AUTHTOK); 368 369 if (pam_err != PAM_SUCCESS) 370 PAM_END("pam_chauthtok"); 371 break; 372 373 default: 374 PAM_END("pam_acct_mgmt"); 375 break; 376 } 377 break; 378 379 case PAM_AUTH_ERR: 380 case PAM_USER_UNKNOWN: 381 case PAM_MAXTRIES: 382 auth_passed = 0; 383 break; 384 385 default: 386 PAM_END("pam_authenticate"); 387 break; 388 } 389 390 (void)setpriority(PRIO_PROCESS, 0, 0); 391 392 skip_auth: 393 /* 394 * If the user exists and authentication passed, 395 * get out of the loop and login the user. 396 */ 397 if (pwd && auth_passed) 398 break; 399 400 (void)printf("Login incorrect\n"); 401 failures++; 402 cnt++; 403 /* we allow 10 tries, but after 3 we start backing off */ 404 if (cnt > login_backoff) { 405 if (cnt >= login_retries) { 406 badlogin(username); 407 pam_end(pamh, PAM_SUCCESS); 408 sleepexit(1); 409 } 410 sleep((u_int)((cnt - 3) * 5)); 411 } 412 } 413 414 /* committed to login -- turn off timeout */ 415 (void)alarm((u_int)0); 416 417 endpwent(); 418 419 quietlog = login_getcapbool(lc, "hushlogin", 0); 420 421 /* 422 * Temporarily give up special privileges so we can change 423 * into NFS-mounted homes that are exported for non-root 424 * access and have mode 7x0 425 */ 426 saved_uid = geteuid(); 427 saved_gid = getegid(); 428 nsaved_gids = getgroups(NGROUPS_MAX, saved_gids); 429 430 (void)setegid(pwd->pw_gid); 431 initgroups(username, pwd->pw_gid); 432 (void)seteuid(pwd->pw_uid); 433 434 if (chdir(pwd->pw_dir) != 0) { 435 if (login_getcapbool(lc, "requirehome", 0)) { 436 (void)printf("Home directory %s required\n", 437 pwd->pw_dir); 438 pam_end(pamh, PAM_SUCCESS); 439 exit(1); 440 } 441 442 (void)printf("No home directory %s!\n", pwd->pw_dir); 443 if (chdir("/")) { 444 pam_end(pamh, PAM_SUCCESS); 445 exit(0); 446 } 447 pwd->pw_dir = "/"; 448 (void)printf("Logging in with home = \"/\".\n"); 449 } 450 451 if (!quietlog) { 452 quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0; 453 pam_silent = 0; 454 } 455 456 /* regain special privileges */ 457 setegid(saved_gid); 458 setgroups(nsaved_gids, saved_gids); 459 seteuid(saved_uid); 460 461 (void)chown(ttyn, pwd->pw_uid, 462 (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid); 463 464 /* Nothing else left to fail -- really log in. */ 465 update_db(quietlog); 466 467 if (nested == NULL && setusercontext(lc, pwd, pwd->pw_uid, 468 LOGIN_SETLOGIN) != 0) { 469 syslog(LOG_ERR, "setusercontext failed"); 470 pam_end(pamh, PAM_SUCCESS); 471 exit(1); 472 } 473 474 if (tty[sizeof("tty")-1] == 'd') 475 syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name); 476 477 /* If fflag is on, assume caller/authenticator has logged root login. */ 478 if (rootlogin && fflag == 0) { 479 if (hostname) 480 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s", 481 username, tty, hostname); 482 else 483 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", 484 username, tty); 485 } 486 487 /* 488 * Establish groups 489 */ 490 if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETGROUP) != 0) { 491 syslog(LOG_ERR, "setusercontext failed"); 492 pam_end(pamh, PAM_SUCCESS); 493 exit(1); 494 } 495 496 pam_err = pam_setcred(pamh, pam_silent|PAM_ESTABLISH_CRED); 497 if (pam_err != PAM_SUCCESS) 498 PAM_END("pam_setcred"); 499 500 pam_err = pam_open_session(pamh, pam_silent); 501 if (pam_err != PAM_SUCCESS) 502 PAM_END("pam_open_session"); 503 504 /* 505 * Fork because we need to call pam_closesession as root. 506 * Make sure signals cannot kill the parent. 507 * This is copied from crontab(8), which has to 508 * cope with a similar situation. 509 */ 510 oint = signal(SIGINT, SIG_IGN); 511 oabrt = signal(SIGABRT, SIG_IGN); 512 513 switch(pid = fork()) { 514 case -1: 515 pam_err = pam_close_session(pamh, 0); 516 if (pam_err != PAM_SUCCESS) { 517 syslog(LOG_ERR, "pam_close_session: %s", 518 pam_strerror(pamh, pam_err)); 519 warnx("pam_close_session: %s", 520 pam_strerror(pamh, pam_err)); 521 } 522 syslog(LOG_ERR, "fork failed: %m"); 523 warn("fork failed"); 524 pam_end(pamh, pam_err); 525 exit(1); 526 break; 527 528 case 0: /* Child */ 529 break; 530 531 default: 532 /* 533 * Parent: wait for the child to terminate 534 * and call pam_close_session. 535 */ 536 if ((xpid = waitpid(pid, &status, 0)) != pid) { 537 pam_err = pam_close_session(pamh, 0); 538 if (pam_err != PAM_SUCCESS) { 539 syslog(LOG_ERR, 540 "pam_close_session: %s", 541 pam_strerror(pamh, pam_err)); 542 warnx("pam_close_session: %s", 543 pam_strerror(pamh, pam_err)); 544 } 545 pam_end(pamh, pam_err); 546 if (xpid != -1) 547 warnx("wrong PID: %d != %d", pid, xpid); 548 else 549 warn("wait for pid %d failed", pid); 550 exit(1); 551 } 552 553 (void)signal(SIGINT, oint); 554 (void)signal(SIGABRT, oabrt); 555 if ((pam_err = pam_close_session(pamh, 0)) != PAM_SUCCESS) { 556 syslog(LOG_ERR, "pam_close_session: %s", 557 pam_strerror(pamh, pam_err)); 558 warnx("pam_close_session: %s", 559 pam_strerror(pamh, pam_err)); 560 } 561 pam_end(pamh, PAM_SUCCESS); 562 exit(0); 563 break; 564 } 565 566 /* 567 * The child: starting here, we don't have to care about 568 * handling PAM issues if we exit, the parent will do the 569 * job when we exit. 570 * 571 * Destroy environment unless user has requested its preservation. 572 * Try to preserve TERM anyway. 573 */ 574 saved_term = getenv("TERM"); 575 if (!pflag) { 576 environ = envinit; 577 if (saved_term) 578 setenv("TERM", saved_term, 0); 579 } 580 581 if (*pwd->pw_shell == '\0') 582 pwd->pw_shell = _PATH_BSHELL; 583 584 shell = login_getcapstr(lc, "shell", pwd->pw_shell, pwd->pw_shell); 585 if (*shell == '\0') 586 shell = pwd->pw_shell; 587 588 if ((pwd->pw_shell = strdup(shell)) == NULL) { 589 syslog(LOG_ERR, "Cannot alloc mem"); 590 exit(1); 591 } 592 593 (void)setenv("HOME", pwd->pw_dir, 1); 594 (void)setenv("SHELL", pwd->pw_shell, 1); 595 if (term[0] == '\0') { 596 char *tt = (char *)stypeof(tty); 597 598 if (tt == NULL) 599 tt = login_getcapstr(lc, "term", NULL, NULL); 600 601 /* unknown term -> "su" */ 602 (void)strlcpy(term, tt != NULL ? tt : "su", sizeof(term)); 603 } 604 (void)setenv("TERM", term, 0); 605 (void)setenv("LOGNAME", pwd->pw_name, 1); 606 (void)setenv("USER", pwd->pw_name, 1); 607 608 /* 609 * Add PAM environement 610 */ 611 if ((pamenv = pam_getenvlist(pamh)) != NULL) { 612 char **envitem; 613 614 for (envitem = pamenv; *envitem; envitem++) { 615 putenv(*envitem); 616 free(*envitem); 617 } 618 619 free(pamenv); 620 } 621 622 /* This drops root privs */ 623 if (setusercontext(lc, pwd, pwd->pw_uid, 624 (LOGIN_SETALL & ~LOGIN_SETLOGIN)) != 0) { 625 syslog(LOG_ERR, "setusercontext failed"); 626 exit(1); 627 } 628 629 if (!quietlog) { 630 char *fname; 631 632 fname = login_getcapstr(lc, "copyright", NULL, NULL); 633 if (fname != NULL && access(fname, F_OK) == 0) 634 motd(fname); 635 else 636 (void)printf("%s", copyrightstr); 637 638 fname = login_getcapstr(lc, "welcome", NULL, NULL); 639 if (fname == NULL || access(fname, F_OK) != 0) 640 fname = _PATH_MOTDFILE; 641 motd(fname); 642 643 (void)snprintf(tbuf, 644 sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pwd->pw_name); 645 if (stat(tbuf, &st) == 0 && st.st_size != 0) 646 (void)printf("You have %smail.\n", 647 (st.st_mtime > st.st_atime) ? "new " : ""); 648 } 649 650 login_close(lc); 651 652 (void)signal(SIGALRM, SIG_DFL); 653 (void)signal(SIGQUIT, SIG_DFL); 654 (void)signal(SIGINT, SIG_DFL); 655 (void)signal(SIGTSTP, SIG_IGN); 656 657 tbuf[0] = '-'; 658 (void)strlcpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ? 659 p + 1 : pwd->pw_shell, sizeof(tbuf) - 1); 660 661 execlp(pwd->pw_shell, tbuf, 0); 662 err(1, "%s", pwd->pw_shell); 663 } 664 665 #define NBUFSIZ (MAXLOGNAME + 1) 666 667 668 void 669 getloginname(void) 670 { 671 int ch; 672 char *p; 673 static char nbuf[NBUFSIZ]; 674 675 for (;;) { 676 (void)printf("login: "); 677 for (p = nbuf; (ch = getchar()) != '\n'; ) { 678 if (ch == EOF) { 679 badlogin(username); 680 exit(0); 681 } 682 if (p < nbuf + (NBUFSIZ - 1)) 683 *p++ = ch; 684 } 685 if (p > nbuf) { 686 if (nbuf[0] == '-') 687 (void)fprintf(stderr, 688 "login names may not start with '-'.\n"); 689 else { 690 *p = '\0'; 691 username = nbuf; 692 break; 693 } 694 } 695 } 696 } 697 698 int 699 rootterm(char *ttyn) 700 { 701 struct ttyent *t; 702 703 return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE); 704 } 705 706 jmp_buf motdinterrupt; 707 708 void 709 motd(char *fname) 710 { 711 int fd, nchars; 712 sig_t oldint; 713 char tbuf[8192]; 714 715 if ((fd = open(fname ? fname : _PATH_MOTDFILE, O_RDONLY, 0)) < 0) 716 return; 717 oldint = signal(SIGINT, sigint); 718 if (setjmp(motdinterrupt) == 0) 719 while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0) 720 (void)write(fileno(stdout), tbuf, nchars); 721 (void)signal(SIGINT, oldint); 722 (void)close(fd); 723 } 724 725 /* ARGSUSED */ 726 void 727 sigint(int signo) 728 { 729 730 longjmp(motdinterrupt, 1); 731 } 732 733 /* ARGSUSED */ 734 void 735 timedout(int signo) 736 { 737 738 (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout); 739 exit(0); 740 } 741 742 static void 743 update_db(int quietlog) 744 { 745 if (nested != NULL) { 746 if (hostname != NULL) 747 syslog(LOG_NOTICE, "%s to %s on tty %s from %s", 748 nested, pwd->pw_name, tty, hostname); 749 else 750 syslog(LOG_NOTICE, "%s to %s on tty %s", nested, 751 pwd->pw_name, tty); 752 753 return; 754 } 755 if (hostname != NULL && have_ss == 0) { 756 socklen_t len = sizeof(ss); 757 (void)getpeername(STDIN_FILENO, (struct sockaddr *)&ss, &len); 758 } 759 (void)gettimeofday(&now, NULL); 760 } 761 762 void 763 badlogin(char *name) 764 { 765 766 if (failures == 0) 767 return; 768 if (hostname) { 769 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s", 770 failures, failures > 1 ? "S" : "", hostname); 771 syslog(LOG_AUTHPRIV|LOG_NOTICE, 772 "%d LOGIN FAILURE%s FROM %s, %s", 773 failures, failures > 1 ? "S" : "", hostname, name); 774 } else { 775 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s", 776 failures, failures > 1 ? "S" : "", tty); 777 syslog(LOG_AUTHPRIV|LOG_NOTICE, 778 "%d LOGIN FAILURE%s ON %s, %s", 779 failures, failures > 1 ? "S" : "", tty, name); 780 } 781 } 782 783 const char * 784 stypeof(const char *ttyid) 785 { 786 struct ttyent *t; 787 788 return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : NULL); 789 } 790 791 void 792 sleepexit(int eval) 793 { 794 795 (void)sleep(5); 796 exit(eval); 797 } 798 799 void 800 decode_ss(const char *arg) 801 { 802 struct sockaddr_storage *ssp; 803 size_t len = strlen(arg); 804 805 if (len > sizeof(*ssp) * 4 + 1 || len < sizeof(*ssp)) 806 errx(1, "Bad argument"); 807 808 if ((ssp = malloc(len)) == NULL) 809 err(1, NULL); 810 811 if (strunvis((char *)ssp, arg) != sizeof(*ssp)) 812 errx(1, "Decoding error"); 813 814 (void)memcpy(&ss, ssp, sizeof(ss)); 815 have_ss = 1; 816 } 817 818 void 819 usage(void) 820 { 821 (void)fprintf(stderr, 822 "Usage: %s [-Ffps] [-a address] [-h hostname] [username]\n", 823 getprogname()); 824 exit(1); 825 } 826
Indexes created Tue Sep 30 11:09:46 GMT 2025