login_pam.c revision 1.4.2.4.2.2
1 /* $NetBSD: login_pam.c,v 1.4.2.4.2.2 2006/03/10 13:28:24 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 1.4.2.4.2.2 2006/03/10 13:28:24 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 /* 428 * We allow login_retries tries, but after login_backoff 429 * we start backing off. These default to 10 and 3 430 * respectively. 431 */ 432 if (cnt > login_backoff) { 433 if (cnt >= login_retries) { 434 badlogin(username); 435 pam_end(pamh, PAM_SUCCESS); 436 sleepexit(EXIT_FAILURE); 437 } 438 sleep((u_int)((cnt - login_backoff) * 5)); 439 } 440 } 441 442 /* committed to login -- turn off timeout */ 443 (void)alarm((u_int)0); 444 445 endpwent(); 446 447 quietlog = login_getcapbool(lc, "hushlogin", 0); 448 449 /* 450 * Temporarily give up special privileges so we can change 451 * into NFS-mounted homes that are exported for non-root 452 * access and have mode 7x0 453 */ 454 saved_uid = geteuid(); 455 saved_gid = getegid(); 456 nsaved_gids = getgroups(NGROUPS_MAX, saved_gids); 457 458 (void)setegid(pwd->pw_gid); 459 initgroups(username, pwd->pw_gid); 460 (void)seteuid(pwd->pw_uid); 461 462 if (chdir(pwd->pw_dir) != 0) { 463 if (login_getcapbool(lc, "requirehome", 0)) { 464 (void)printf("Home directory %s required\n", 465 pwd->pw_dir); 466 pam_end(pamh, PAM_SUCCESS); 467 exit(EXIT_FAILURE); 468 } 469 470 (void)printf("No home directory %s!\n", pwd->pw_dir); 471 if (chdir("/")) { 472 pam_end(pamh, PAM_SUCCESS); 473 exit(EXIT_SUCCESS); 474 } 475 pwd->pw_dir = "/"; 476 (void)printf("Logging in with home = \"/\".\n"); 477 } 478 479 if (!quietlog) { 480 quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0; 481 pam_silent = 0; 482 } 483 484 /* regain special privileges */ 485 setegid(saved_gid); 486 setgroups(nsaved_gids, saved_gids); 487 seteuid(saved_uid); 488 489 (void)chown(ttyn, pwd->pw_uid, 490 (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid); 491 492 if (ttyaction(ttyn, "login", pwd->pw_name)) 493 (void)printf("Warning: ttyaction failed.\n"); 494 495 /* Nothing else left to fail -- really log in. */ 496 update_db(quietlog); 497 498 if (nested == NULL && setusercontext(lc, pwd, pwd->pw_uid, 499 LOGIN_SETLOGIN) != 0) { 500 syslog(LOG_ERR, "setusercontext failed"); 501 pam_end(pamh, PAM_SUCCESS); 502 exit(EXIT_FAILURE); 503 } 504 505 if (tty[sizeof("tty")-1] == 'd') 506 syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name); 507 508 /* If fflag is on, assume caller/authenticator has logged root login. */ 509 if (rootlogin && fflag == 0) { 510 if (hostname) 511 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s", 512 username, tty, hostname); 513 else 514 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", 515 username, tty); 516 } 517 518 /* 519 * Establish groups 520 */ 521 if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETGROUP) != 0) { 522 syslog(LOG_ERR, "setusercontext failed"); 523 pam_end(pamh, PAM_SUCCESS); 524 exit(EXIT_FAILURE); 525 } 526 527 pam_err = pam_setcred(pamh, pam_silent|PAM_ESTABLISH_CRED); 528 if (pam_err != PAM_SUCCESS) 529 PAM_END("pam_setcred"); 530 531 pam_err = pam_open_session(pamh, pam_silent); 532 if (pam_err != PAM_SUCCESS) 533 PAM_END("pam_open_session"); 534 535 /* 536 * Fork because we need to call pam_closesession as root. 537 * Make sure signals cannot kill the parent. 538 * This is copied from crontab(8), which has to 539 * cope with a similar situation. 540 */ 541 oint = signal(SIGINT, SIG_IGN); 542 oabrt = signal(SIGABRT, SIG_IGN); 543 544 switch(pid = fork()) { 545 case -1: 546 pam_err = pam_close_session(pamh, 0); 547 if (pam_err != PAM_SUCCESS) { 548 syslog(LOG_ERR, "pam_close_session: %s", 549 pam_strerror(pamh, pam_err)); 550 warnx("pam_close_session: %s", 551 pam_strerror(pamh, pam_err)); 552 } 553 syslog(LOG_ERR, "fork failed: %m"); 554 warn("fork failed"); 555 pam_end(pamh, pam_err); 556 exit(EXIT_FAILURE); 557 break; 558 559 case 0: /* Child */ 560 break; 561 562 default: 563 /* 564 * Parent: wait for the child to terminate 565 * and call pam_close_session. 566 */ 567 if ((xpid = waitpid(pid, &status, 0)) != pid) { 568 pam_err = pam_close_session(pamh, 0); 569 if (pam_err != PAM_SUCCESS) { 570 syslog(LOG_ERR, 571 "pam_close_session: %s", 572 pam_strerror(pamh, pam_err)); 573 warnx("pam_close_session: %s", 574 pam_strerror(pamh, pam_err)); 575 } 576 pam_end(pamh, pam_err); 577 if (xpid != -1) 578 warnx("wrong PID: %d != %d", pid, xpid); 579 else 580 warn("wait for pid %d failed", pid); 581 exit(EXIT_FAILURE); 582 } 583 584 (void)signal(SIGINT, oint); 585 (void)signal(SIGABRT, oabrt); 586 if ((pam_err = pam_close_session(pamh, 0)) != PAM_SUCCESS) { 587 syslog(LOG_ERR, "pam_close_session: %s", 588 pam_strerror(pamh, pam_err)); 589 warnx("pam_close_session: %s", 590 pam_strerror(pamh, pam_err)); 591 } 592 pam_end(pamh, PAM_SUCCESS); 593 exit(EXIT_SUCCESS); 594 break; 595 } 596 597 /* 598 * The child: starting here, we don't have to care about 599 * handling PAM issues if we exit, the parent will do the 600 * job when we exit. 601 * 602 * Destroy environment unless user has requested its preservation. 603 * Try to preserve TERM anyway. 604 */ 605 saved_term = getenv("TERM"); 606 if (!pflag) { 607 environ = envinit; 608 if (saved_term) 609 setenv("TERM", saved_term, 0); 610 } 611 612 if (*pwd->pw_shell == '\0') 613 pwd->pw_shell = _PATH_BSHELL; 614 615 shell = login_getcapstr(lc, "shell", pwd->pw_shell, pwd->pw_shell); 616 if (*shell == '\0') 617 shell = pwd->pw_shell; 618 619 if ((pwd->pw_shell = strdup(shell)) == NULL) { 620 syslog(LOG_ERR, "Cannot alloc mem"); 621 exit(EXIT_FAILURE); 622 } 623 624 (void)setenv("HOME", pwd->pw_dir, 1); 625 (void)setenv("SHELL", pwd->pw_shell, 1); 626 if (term[0] == '\0') { 627 char *tt = (char *)stypeof(tty); 628 629 if (tt == NULL) 630 tt = login_getcapstr(lc, "term", NULL, NULL); 631 632 /* unknown term -> "su" */ 633 (void)strlcpy(term, tt != NULL ? tt : "su", sizeof(term)); 634 } 635 (void)setenv("TERM", term, 0); 636 (void)setenv("LOGNAME", pwd->pw_name, 1); 637 (void)setenv("USER", pwd->pw_name, 1); 638 639 /* 640 * Add PAM environement 641 */ 642 if ((pamenv = pam_getenvlist(pamh)) != NULL) { 643 char **envitem; 644 645 for (envitem = pamenv; *envitem; envitem++) { 646 putenv(*envitem); 647 free(*envitem); 648 } 649 650 free(pamenv); 651 } 652 653 /* This drops root privs */ 654 if (setusercontext(lc, pwd, pwd->pw_uid, 655 (LOGIN_SETALL & ~LOGIN_SETLOGIN)) != 0) { 656 syslog(LOG_ERR, "setusercontext failed"); 657 exit(EXIT_FAILURE); 658 } 659 660 if (!quietlog) { 661 char *fname; 662 663 fname = login_getcapstr(lc, "copyright", NULL, NULL); 664 if (fname != NULL && access(fname, F_OK) == 0) 665 motd(fname); 666 else 667 (void)printf("%s", copyrightstr); 668 669 fname = login_getcapstr(lc, "welcome", NULL, NULL); 670 if (fname == NULL || access(fname, F_OK) != 0) 671 fname = _PATH_MOTDFILE; 672 motd(fname); 673 674 (void)snprintf(tbuf, 675 sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pwd->pw_name); 676 if (stat(tbuf, &st) == 0 && st.st_size != 0) 677 (void)printf("You have %smail.\n", 678 (st.st_mtime > st.st_atime) ? "new " : ""); 679 } 680 681 login_close(lc); 682 683 (void)signal(SIGALRM, SIG_DFL); 684 (void)signal(SIGQUIT, SIG_DFL); 685 (void)signal(SIGINT, SIG_DFL); 686 (void)signal(SIGTSTP, SIG_IGN); 687 688 tbuf[0] = '-'; 689 (void)strlcpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ? 690 p + 1 : pwd->pw_shell, sizeof(tbuf) - 1); 691 692 execlp(pwd->pw_shell, tbuf, NULL); 693 err(EXIT_FAILURE, "%s", pwd->pw_shell); 694 } 695 696 #define NBUFSIZ (MAXLOGNAME + 1) 697 698 699 void 700 getloginname(void) 701 { 702 int ch; 703 char *p; 704 static char nbuf[NBUFSIZ]; 705 706 for (;;) { 707 (void)printf("login: "); 708 for (p = nbuf; (ch = getchar()) != '\n'; ) { 709 if (ch == EOF) { 710 badlogin(username); 711 exit(EXIT_SUCCESS); 712 } 713 if (p < nbuf + (NBUFSIZ - 1)) 714 *p++ = ch; 715 } 716 if (p > nbuf) { 717 if (nbuf[0] == '-') 718 (void)fprintf(stderr, 719 "login names may not start with '-'.\n"); 720 else { 721 *p = '\0'; 722 username = nbuf; 723 break; 724 } 725 } 726 } 727 } 728 729 int 730 rootterm(char *ttyn) 731 { 732 struct ttyent *t; 733 734 return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE); 735 } 736 737 jmp_buf motdinterrupt; 738 739 void 740 motd(char *fname) 741 { 742 int fd, nchars; 743 sig_t oldint; 744 char tbuf[8192]; 745 746 if ((fd = open(fname ? fname : _PATH_MOTDFILE, O_RDONLY, 0)) < 0) 747 return; 748 oldint = signal(SIGINT, sigint); 749 if (setjmp(motdinterrupt) == 0) 750 while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0) 751 (void)write(fileno(stdout), tbuf, nchars); 752 (void)signal(SIGINT, oldint); 753 (void)close(fd); 754 } 755 756 /* ARGSUSED */ 757 void 758 sigint(int signo) 759 { 760 761 longjmp(motdinterrupt, 1); 762 } 763 764 /* ARGSUSED */ 765 void 766 timedout(int signo) 767 { 768 769 (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout); 770 exit(EXIT_SUCCESS); 771 } 772 773 static void 774 update_db(int quietlog) 775 { 776 if (nested != NULL) { 777 if (hostname != NULL) 778 syslog(LOG_NOTICE, "%s to %s on tty %s from %s", 779 nested, pwd->pw_name, tty, hostname); 780 else 781 syslog(LOG_NOTICE, "%s to %s on tty %s", nested, 782 pwd->pw_name, tty); 783 784 } 785 if (hostname != NULL && have_ss == 0) { 786 socklen_t len = sizeof(ss); 787 (void)getpeername(STDIN_FILENO, (struct sockaddr *)&ss, &len); 788 } 789 (void)gettimeofday(&now, NULL); 790 } 791 792 void 793 badlogin(char *name) 794 { 795 796 if (failures == 0) 797 return; 798 if (hostname) { 799 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s", 800 failures, failures > 1 ? "S" : "", hostname); 801 syslog(LOG_AUTHPRIV|LOG_NOTICE, 802 "%d LOGIN FAILURE%s FROM %s, %s", 803 failures, failures > 1 ? "S" : "", hostname, name); 804 } else { 805 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s", 806 failures, failures > 1 ? "S" : "", tty); 807 syslog(LOG_AUTHPRIV|LOG_NOTICE, 808 "%d LOGIN FAILURE%s ON %s, %s", 809 failures, failures > 1 ? "S" : "", tty, name); 810 } 811 } 812 813 const char * 814 stypeof(const char *ttyid) 815 { 816 struct ttyent *t; 817 818 return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : NULL); 819 } 820 821 void 822 sleepexit(int eval) 823 { 824 825 (void)sleep(5); 826 exit(eval); 827 } 828 829 void 830 decode_ss(const char *arg) 831 { 832 struct sockaddr_storage *ssp; 833 size_t len = strlen(arg); 834 835 if (len > sizeof(*ssp) * 4 + 1 || len < sizeof(*ssp)) 836 errx(EXIT_FAILURE, "Bad argument"); 837 838 if ((ssp = malloc(len)) == NULL) 839 err(EXIT_FAILURE, NULL); 840 841 if (strunvis((char *)ssp, arg) != sizeof(*ssp)) 842 errx(EXIT_FAILURE, "Decoding error"); 843 844 (void)memcpy(&ss, ssp, sizeof(ss)); 845 have_ss = 1; 846 } 847 848 void 849 usage(void) 850 { 851 (void)fprintf(stderr, 852 "Usage: %s [-Ffps] [-a address] [-h hostname] [username]\n", 853 getprogname()); 854 exit(EXIT_FAILURE); 855 } 856
Indexes created Wed Oct 22 13:09:56 GMT 2025