login_pam.c revision 1.19
1 /* $NetBSD: login_pam.c,v 1.19 2008/07/21 14:19:23 lukem 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_pam.c,v 1.19 2008/07/21 14:19:23 lukem 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 <util.h> 74 #include <login_cap.h> 75 #include <vis.h> 76 77 #include <security/pam_appl.h> 78 #include <security/openpam.h> 79 80 #include "pathnames.h" 81 82 void badlogin (char *); 83 static void update_db (int); 84 void getloginname (void); 85 int main (int, char *[]); 86 void motd (char *); 87 int rootterm (char *); 88 void sigint (int); 89 void sleepexit (int); 90 const char *stypeof (const char *); 91 void timedout (int); 92 void decode_ss (const char *); 93 void usage (void); 94 95 static struct pam_conv pamc = { openpam_ttyconv, NULL }; 96 97 #define TTYGRPNAME "tty" /* name of group to own ttys */ 98 99 #define DEFAULT_BACKOFF 3 100 #define DEFAULT_RETRIES 10 101 102 /* 103 * This bounds the time given to login. Not a define so it can 104 * be patched on machines where it's too small. 105 */ 106 u_int timeout = 300; 107 108 struct passwd *pwd, pwres; 109 char pwbuf[1024]; 110 struct group grs, *grp; 111 char grbuf[1024]; 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, pflag, quietlog, rootlogin; 125 int auth_passed; 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 sig_t oint, oabrt, oquit, oalrm; 140 const void *newuser; 141 int pam_silent = PAM_SILENT; 142 pid_t xpid, pid; 143 int status; 144 char *saved_term; 145 char **pamenv; 146 147 tbuf[0] = '\0'; 148 pwprompt = NULL; 149 nested = NULL; 150 need_chpass = require_chpass = 0; 151 152 oabrt = signal(SIGABRT, SIG_IGN); 153 oalrm = signal(SIGALRM, timedout); 154 oint = signal(SIGINT, SIG_IGN); 155 oquit = signal(SIGQUIT, SIG_IGN); 156 157 (void)alarm(timeout); 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 */ 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 = pflag = 0; 178 have_ss = 0; 179 uid = getuid(); 180 while ((ch = getopt(argc, argv, "a:fh:p")) != -1) 181 switch (ch) { 182 case 'a': 183 if (uid) { 184 errno = EPERM; 185 err(EXIT_FAILURE, "-a option"); 186 } 187 decode_ss(optarg); 188 #ifdef notdef 189 (void)sockaddr_snprintf(optarg, 190 sizeof(struct sockaddr_storage), "%a", (void *)&ss); 191 #endif 192 break; 193 case 'f': 194 fflag = 1; 195 break; 196 case 'h': 197 if (uid) { 198 errno = EPERM; 199 err(EXIT_FAILURE, "-h option"); 200 } 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 default: 210 case '?': 211 usage(); 212 break; 213 } 214 215 setproctitle(NULL); 216 argc -= optind; 217 argv += optind; 218 219 if (*argv) { 220 username = *argv; 221 ask = 0; 222 } else 223 ask = 1; 224 225 #ifdef F_CLOSEM 226 (void)fcntl(3, F_CLOSEM, 0); 227 #else 228 for (cnt = getdtablesize(); cnt > 2; cnt--) 229 (void)close(cnt); 230 #endif 231 232 ttyn = ttyname(STDIN_FILENO); 233 if (ttyn == NULL || *ttyn == '\0') { 234 (void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY); 235 ttyn = tname; 236 } 237 if ((tty = strstr(ttyn, "/pts/")) != NULL) 238 ++tty; 239 else if ((tty = strrchr(ttyn, '/')) != NULL) 240 ++tty; 241 else 242 tty = ttyn; 243 244 if (issetugid()) { 245 nested = strdup(user_from_uid(getuid(), 0)); 246 if (nested == NULL) { 247 syslog(LOG_ERR, "strdup: %m"); 248 sleepexit(EXIT_FAILURE); 249 } 250 } 251 252 /* Get "login-retries" and "login-backoff" from default class */ 253 if ((lc = login_getclass(NULL)) != NULL) { 254 login_retries = (int)login_getcapnum(lc, "login-retries", 255 DEFAULT_RETRIES, DEFAULT_RETRIES); 256 login_backoff = (int)login_getcapnum(lc, "login-backoff", 257 DEFAULT_BACKOFF, DEFAULT_BACKOFF); 258 login_close(lc); 259 lc = NULL; 260 } 261 262 263 for (cnt = 0;; ask = 1) { 264 if (ask) { 265 fflag = 0; 266 getloginname(); 267 } 268 rootlogin = 0; 269 auth_passed = 0; 270 if (strlen(username) > MAXLOGNAME) 271 username[MAXLOGNAME] = '\0'; 272 273 /* 274 * Note if trying multiple user names; log failures for 275 * previous user name, but don't bother logging one failure 276 * for nonexistent name (mistyped username). 277 */ 278 if (failures && strcmp(tbuf, username)) { 279 if (failures > (pwd ? 0 : 1)) 280 badlogin(tbuf); 281 failures = 0; 282 } 283 284 #define PAM_END(msg) do { \ 285 syslog(LOG_ERR, "%s: %s", msg, pam_strerror(pamh, pam_err)); \ 286 warnx("%s: %s", msg, pam_strerror(pamh, pam_err)); \ 287 pam_end(pamh, pam_err); \ 288 sleepexit(EXIT_FAILURE); \ 289 } while (/*CONSTCOND*/0) 290 291 pam_err = pam_start("login", username, &pamc, &pamh); 292 if (pam_err != PAM_SUCCESS) { 293 if (pamh != NULL) 294 PAM_END("pam_start"); 295 /* Things went really bad... */ 296 syslog(LOG_ERR, "pam_start failed: %s", 297 pam_strerror(pamh, pam_err)); 298 errx(EXIT_FAILURE, "pam_start failed"); 299 } 300 301 #define PAM_SET_ITEM(item, var) do { \ 302 pam_err = pam_set_item(pamh, (item), (var)); \ 303 if (pam_err != PAM_SUCCESS) \ 304 PAM_END("pam_set_item(" # item ")"); \ 305 } while (/*CONSTCOND*/0) 306 307 /* 308 * Fill hostname tty, and nested user 309 */ 310 PAM_SET_ITEM(PAM_RHOST, hostname); 311 PAM_SET_ITEM(PAM_TTY, tty); 312 if (nested) 313 PAM_SET_ITEM(PAM_NUSER, nested); 314 if (have_ss) 315 PAM_SET_ITEM(PAM_SOCKADDR, &ss); 316 317 /* 318 * Don't check for errors, because we don't want to give 319 * out any information. 320 */ 321 pwd = NULL; 322 (void)getpwnam_r(username, &pwres, pwbuf, sizeof(pwbuf), &pwd); 323 324 /* 325 * Establish the class now, before we might goto 326 * within the next block. pwd can be NULL since it 327 * falls back to the "default" class if it is. 328 */ 329 lc = login_getclass(pwd ? pwd->pw_class : NULL); 330 331 /* 332 * if we have a valid account name, and it doesn't have a 333 * password, or the -f option was specified and the caller 334 * is root or the caller isn't changing their uid, don't 335 * authenticate. 336 */ 337 if (pwd) { 338 if (pwd->pw_uid == 0) 339 rootlogin = 1; 340 341 if (fflag && (uid == 0 || uid == pwd->pw_uid)) { 342 /* already authenticated */ 343 auth_passed = 1; 344 goto skip_auth; 345 } 346 } 347 348 (void)setpriority(PRIO_PROCESS, 0, -4); 349 350 switch(pam_err = pam_authenticate(pamh, pam_silent)) { 351 case PAM_SUCCESS: 352 /* 353 * PAM can change the user, refresh 354 * username, pwd, and lc. 355 */ 356 pam_err = pam_get_item(pamh, PAM_USER, &newuser); 357 if (pam_err != PAM_SUCCESS) 358 PAM_END("pam_get_item(PAM_USER)"); 359 360 username = (char *)newuser; 361 /* 362 * Don't check for errors, because we don't want to give 363 * out any information. 364 */ 365 pwd = NULL; 366 (void)getpwnam_r(username, &pwres, pwbuf, sizeof(pwbuf), 367 &pwd); 368 lc = login_getpwclass(pwd); 369 auth_passed = 1; 370 371 switch (pam_err = pam_acct_mgmt(pamh, pam_silent)) { 372 case PAM_SUCCESS: 373 break; 374 375 case PAM_NEW_AUTHTOK_REQD: 376 pam_err = pam_chauthtok(pamh, 377 pam_silent|PAM_CHANGE_EXPIRED_AUTHTOK); 378 379 if (pam_err != PAM_SUCCESS) 380 PAM_END("pam_chauthtok"); 381 break; 382 383 case PAM_AUTH_ERR: 384 case PAM_USER_UNKNOWN: 385 case PAM_MAXTRIES: 386 auth_passed = 0; 387 break; 388 389 default: 390 PAM_END("pam_acct_mgmt"); 391 break; 392 } 393 break; 394 395 case PAM_AUTH_ERR: 396 case PAM_USER_UNKNOWN: 397 case PAM_MAXTRIES: 398 auth_passed = 0; 399 break; 400 401 default: 402 PAM_END("pam_authenticate"); 403 break; 404 } 405 406 (void)setpriority(PRIO_PROCESS, 0, 0); 407 408 skip_auth: 409 /* 410 * If the user exists and authentication passed, 411 * get out of the loop and login the user. 412 */ 413 if (pwd && auth_passed) 414 break; 415 416 (void)printf("Login incorrect or refused on this terminal.\n"); 417 failures++; 418 cnt++; 419 /* 420 * We allow login_retries tries, but after login_backoff 421 * we start backing off. These default to 10 and 3 422 * respectively. 423 */ 424 if (cnt > login_backoff) { 425 if (cnt >= login_retries) { 426 badlogin(username); 427 pam_end(pamh, PAM_SUCCESS); 428 sleepexit(EXIT_FAILURE); 429 } 430 sleep((u_int)((cnt - login_backoff) * 5)); 431 } 432 } 433 434 /* committed to login -- turn off timeout */ 435 (void)alarm((u_int)0); 436 437 endpwent(); 438 439 quietlog = login_getcapbool(lc, "hushlogin", 0); 440 441 /* 442 * Temporarily give up special privileges so we can change 443 * into NFS-mounted homes that are exported for non-root 444 * access and have mode 7x0 445 */ 446 saved_uid = geteuid(); 447 saved_gid = getegid(); 448 nsaved_gids = getgroups(NGROUPS_MAX, saved_gids); 449 450 (void)setegid(pwd->pw_gid); 451 initgroups(username, pwd->pw_gid); 452 (void)seteuid(pwd->pw_uid); 453 454 if (chdir(pwd->pw_dir) != 0) { 455 if (login_getcapbool(lc, "requirehome", 0)) { 456 (void)printf("Home directory %s required\n", 457 pwd->pw_dir); 458 pam_end(pamh, PAM_SUCCESS); 459 exit(EXIT_FAILURE); 460 } 461 462 (void)printf("No home directory %s!\n", pwd->pw_dir); 463 if (chdir("/") == -1) { 464 pam_end(pamh, PAM_SUCCESS); 465 exit(EXIT_FAILURE); 466 } 467 pwd->pw_dir = "/"; 468 (void)printf("Logging in with home = \"/\".\n"); 469 } 470 471 if (!quietlog) { 472 quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0; 473 pam_silent = quietlog ? PAM_SILENT : 0; 474 } 475 476 /* regain special privileges */ 477 setegid(saved_gid); 478 setgroups(nsaved_gids, saved_gids); 479 seteuid(saved_uid); 480 481 (void)getgrnam_r(TTYGRPNAME, &grs, grbuf, sizeof(grbuf), &grp); 482 (void)chown(ttyn, pwd->pw_uid, 483 (grp != NULL) ? grp->gr_gid : pwd->pw_gid); 484 485 if (ttyaction(ttyn, "login", pwd->pw_name)) 486 (void)printf("Warning: ttyaction failed.\n"); 487 488 /* Nothing else left to fail -- really log in. */ 489 update_db(quietlog); 490 491 if (nested == NULL && setusercontext(lc, pwd, pwd->pw_uid, 492 LOGIN_SETLOGIN) != 0) { 493 syslog(LOG_ERR, "setusercontext failed"); 494 pam_end(pamh, PAM_SUCCESS); 495 exit(EXIT_FAILURE); 496 } 497 498 if (tty[sizeof("tty")-1] == 'd') 499 syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name); 500 501 /* If fflag is on, assume caller/authenticator has logged root login. */ 502 if (rootlogin && fflag == 0) { 503 if (hostname) 504 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s", 505 username, tty, hostname); 506 else 507 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", 508 username, tty); 509 } 510 511 /* 512 * Establish groups 513 */ 514 if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETGROUP) != 0) { 515 syslog(LOG_ERR, "setusercontext failed"); 516 pam_end(pamh, PAM_SUCCESS); 517 exit(EXIT_FAILURE); 518 } 519 520 pam_err = pam_setcred(pamh, pam_silent|PAM_ESTABLISH_CRED); 521 if (pam_err != PAM_SUCCESS) 522 PAM_END("pam_setcred"); 523 524 pam_err = pam_open_session(pamh, pam_silent); 525 if (pam_err != PAM_SUCCESS) 526 PAM_END("pam_open_session"); 527 528 /* 529 * Fork because we need to call pam_closesession as root. 530 * Make sure signals cannot kill the parent. 531 * This has been handled in the begining of main. 532 */ 533 534 switch(pid = fork()) { 535 case -1: 536 pam_err = pam_close_session(pamh, 0); 537 if (pam_err != PAM_SUCCESS) { 538 syslog(LOG_ERR, "pam_close_session: %s", 539 pam_strerror(pamh, pam_err)); 540 warnx("pam_close_session: %s", 541 pam_strerror(pamh, pam_err)); 542 } 543 syslog(LOG_ERR, "fork failed: %m"); 544 warn("fork failed"); 545 pam_end(pamh, pam_err); 546 exit(EXIT_FAILURE); 547 break; 548 549 case 0: /* Child */ 550 break; 551 552 default: 553 /* 554 * Parent: wait for the child to terminate 555 * and call pam_close_session. 556 */ 557 if ((xpid = waitpid(pid, &status, 0)) != pid) { 558 pam_err = pam_close_session(pamh, 0); 559 if (pam_err != PAM_SUCCESS) { 560 syslog(LOG_ERR, 561 "pam_close_session: %s", 562 pam_strerror(pamh, pam_err)); 563 warnx("pam_close_session: %s", 564 pam_strerror(pamh, pam_err)); 565 } 566 pam_end(pamh, pam_err); 567 if (xpid != -1) 568 warnx("wrong PID: %d != %d", pid, xpid); 569 else 570 warn("wait for pid %d failed", pid); 571 exit(EXIT_FAILURE); 572 } 573 574 (void)signal(SIGABRT, oabrt); 575 (void)signal(SIGALRM, oalrm); 576 (void)signal(SIGINT, oint); 577 (void)signal(SIGQUIT, oquit); 578 if ((pam_err = pam_close_session(pamh, 0)) != PAM_SUCCESS) { 579 syslog(LOG_ERR, "pam_close_session: %s", 580 pam_strerror(pamh, pam_err)); 581 warnx("pam_close_session: %s", 582 pam_strerror(pamh, pam_err)); 583 } 584 pam_end(pamh, PAM_SUCCESS); 585 exit(EXIT_SUCCESS); 586 break; 587 } 588 589 /* 590 * The child: starting here, we don't have to care about 591 * handling PAM issues if we exit, the parent will do the 592 * job when we exit. 593 * 594 * Destroy environment unless user has requested its preservation. 595 * Try to preserve TERM anyway. 596 */ 597 saved_term = getenv("TERM"); 598 if (!pflag) { 599 environ = envinit; 600 if (saved_term) 601 setenv("TERM", saved_term, 0); 602 } 603 604 if (*pwd->pw_shell == '\0') 605 pwd->pw_shell = _PATH_BSHELL; 606 607 shell = login_getcapstr(lc, "shell", pwd->pw_shell, pwd->pw_shell); 608 if (*shell == '\0') 609 shell = pwd->pw_shell; 610 611 if ((pwd->pw_shell = strdup(shell)) == NULL) { 612 syslog(LOG_ERR, "Cannot alloc mem"); 613 exit(EXIT_FAILURE); 614 } 615 616 (void)setenv("HOME", pwd->pw_dir, 1); 617 (void)setenv("SHELL", pwd->pw_shell, 1); 618 if (term[0] == '\0') { 619 char *tt = (char *)stypeof(tty); 620 621 if (tt == NULL) 622 tt = login_getcapstr(lc, "term", NULL, NULL); 623 624 /* unknown term -> "su" */ 625 (void)strlcpy(term, tt != NULL ? tt : "su", sizeof(term)); 626 } 627 (void)setenv("TERM", term, 0); 628 (void)setenv("LOGNAME", pwd->pw_name, 1); 629 (void)setenv("USER", pwd->pw_name, 1); 630 631 /* 632 * Add PAM environement 633 */ 634 if ((pamenv = pam_getenvlist(pamh)) != NULL) { 635 char **envitem; 636 637 for (envitem = pamenv; *envitem; envitem++) { 638 putenv(*envitem); 639 free(*envitem); 640 } 641 642 free(pamenv); 643 } 644 645 /* This drops root privs */ 646 if (setusercontext(lc, pwd, pwd->pw_uid, 647 (LOGIN_SETALL & ~LOGIN_SETLOGIN)) != 0) { 648 syslog(LOG_ERR, "setusercontext failed"); 649 exit(EXIT_FAILURE); 650 } 651 652 if (!quietlog) { 653 char *fname; 654 655 fname = login_getcapstr(lc, "copyright", NULL, NULL); 656 if (fname != NULL && access(fname, F_OK) == 0) 657 motd(fname); 658 else 659 (void)printf("%s", copyrightstr); 660 661 fname = login_getcapstr(lc, "welcome", NULL, NULL); 662 if (fname == NULL || access(fname, F_OK) != 0) 663 fname = _PATH_MOTDFILE; 664 motd(fname); 665 666 (void)snprintf(tbuf, 667 sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pwd->pw_name); 668 if (stat(tbuf, &st) == 0 && st.st_size != 0) 669 (void)printf("You have %smail.\n", 670 (st.st_mtime > st.st_atime) ? "new " : ""); 671 } 672 673 login_close(lc); 674 675 676 tbuf[0] = '-'; 677 (void)strlcpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ? 678 p + 1 : pwd->pw_shell, sizeof(tbuf) - 1); 679 680 (void)signal(SIGABRT, oabrt); 681 (void)signal(SIGALRM, oalrm); 682 (void)signal(SIGINT, oint); 683 (void)signal(SIGQUIT, oquit); 684 (void)signal(SIGTSTP, SIG_IGN); 685 686 execlp(pwd->pw_shell, tbuf, NULL); 687 err(EXIT_FAILURE, "%s", pwd->pw_shell); 688 } 689 690 #define NBUFSIZ (MAXLOGNAME + 1) 691 692 693 void 694 getloginname(void) 695 { 696 int ch; 697 char *p; 698 static char nbuf[NBUFSIZ]; 699 700 for (;;) { 701 (void)printf("login: "); 702 for (p = nbuf; (ch = getchar()) != '\n'; ) { 703 if (ch == EOF) { 704 badlogin(username); 705 exit(EXIT_FAILURE); 706 } 707 if (p < nbuf + (NBUFSIZ - 1)) 708 *p++ = ch; 709 } 710 if (p > nbuf) { 711 if (nbuf[0] == '-') 712 (void)fprintf(stderr, 713 "login names may not start with '-'.\n"); 714 else { 715 *p = '\0'; 716 username = nbuf; 717 break; 718 } 719 } 720 } 721 } 722 723 int 724 rootterm(char *ttyn) 725 { 726 struct ttyent *t; 727 728 return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE); 729 } 730 731 jmp_buf motdinterrupt; 732 733 void 734 motd(char *fname) 735 { 736 int fd, nchars; 737 sig_t oldint; 738 char tbuf[8192]; 739 740 if ((fd = open(fname ? fname : _PATH_MOTDFILE, O_RDONLY, 0)) < 0) 741 return; 742 oldint = signal(SIGINT, sigint); 743 if (setjmp(motdinterrupt) == 0) 744 while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0) 745 (void)write(fileno(stdout), tbuf, nchars); 746 (void)signal(SIGINT, oldint); 747 (void)close(fd); 748 } 749 750 /* ARGSUSED */ 751 void 752 sigint(int signo) 753 { 754 755 longjmp(motdinterrupt, 1); 756 } 757 758 /* ARGSUSED */ 759 void 760 timedout(int signo) 761 { 762 763 (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout); 764 exit(EXIT_FAILURE); 765 } 766 767 static void 768 update_db(int quietlog) 769 { 770 if (nested != NULL) { 771 if (hostname != NULL) 772 syslog(LOG_NOTICE, "%s to %s on tty %s from %s", 773 nested, pwd->pw_name, tty, hostname); 774 else 775 syslog(LOG_NOTICE, "%s to %s on tty %s", nested, 776 pwd->pw_name, tty); 777 778 } 779 if (hostname != NULL && have_ss == 0) { 780 socklen_t len = sizeof(ss); 781 have_ss = getpeername(STDIN_FILENO, (struct sockaddr *)&ss, 782 &len) != -1; 783 } 784 (void)gettimeofday(&now, NULL); 785 } 786 787 void 788 badlogin(char *name) 789 { 790 791 if (failures == 0) 792 return; 793 if (hostname) { 794 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s", 795 failures, failures > 1 ? "S" : "", hostname); 796 syslog(LOG_AUTHPRIV|LOG_NOTICE, 797 "%d LOGIN FAILURE%s FROM %s, %s", 798 failures, failures > 1 ? "S" : "", hostname, name); 799 } else { 800 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s", 801 failures, failures > 1 ? "S" : "", tty); 802 syslog(LOG_AUTHPRIV|LOG_NOTICE, 803 "%d LOGIN FAILURE%s ON %s, %s", 804 failures, failures > 1 ? "S" : "", tty, name); 805 } 806 } 807 808 const char * 809 stypeof(const char *ttyid) 810 { 811 struct ttyent *t; 812 813 return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : NULL); 814 } 815 816 void 817 sleepexit(int eval) 818 { 819 820 (void)sleep(5); 821 exit(eval); 822 } 823 824 void 825 decode_ss(const char *arg) 826 { 827 struct sockaddr_storage *ssp; 828 size_t len = strlen(arg); 829 830 if (len > sizeof(*ssp) * 4 + 1 || len < sizeof(*ssp)) 831 errx(EXIT_FAILURE, "Bad argument"); 832 833 if ((ssp = malloc(len)) == NULL) 834 err(EXIT_FAILURE, NULL); 835 836 if (strunvis((char *)ssp, arg) != sizeof(*ssp)) 837 errx(EXIT_FAILURE, "Decoding error"); 838 839 (void)memcpy(&ss, ssp, sizeof(ss)); 840 have_ss = 1; 841 free(ssp); 842 } 843 844 void 845 usage(void) 846 { 847 (void)fprintf(stderr, 848 "Usage: %s [-fp] [-a address] [-h hostname] [username]\n", 849 getprogname()); 850 exit(EXIT_FAILURE); 851 } 852
Indexes created Tue Sep 30 17:09:57 GMT 2025