login_pam.c revision 1.9
1 /* $NetBSD: login_pam.c,v 1.9 2005/09/21 12:24:11 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 1.9 2005/09/21 12:24:11 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, pwres; 110 char pwbuf[1024]; 111 struct group grs, *grp; 112 char grbuf[1024]; 113 int failures, have_ss; 114 char term[64], *envinit[1], *hostname, *username, *tty, *nested; 115 struct timeval now; 116 struct sockaddr_storage ss; 117 118 extern const char copyrightstr[]; 119 120 int 121 main(int argc, char *argv[]) 122 { 123 extern char **environ; 124 struct stat st; 125 int ask, ch, cnt, fflag, hflag, pflag, sflag, quietlog, rootlogin; 126 int auth_passed; 127 int Fflag; 128 uid_t uid, saved_uid; 129 gid_t saved_gid, saved_gids[NGROUPS_MAX]; 130 int nsaved_gids; 131 char *domain, *p, *ttyn, *pwprompt; 132 char tbuf[MAXPATHLEN + 2], tname[sizeof(_PATH_TTY) + 10]; 133 char localhost[MAXHOSTNAMELEN + 1]; 134 int need_chpass, require_chpass; 135 int login_retries = DEFAULT_RETRIES, 136 login_backoff = DEFAULT_BACKOFF; 137 char *shell = NULL; 138 login_cap_t *lc = NULL; 139 pam_handle_t *pamh = NULL; 140 int pam_err; 141 void *oint; 142 void *oabrt; 143 const void *newuser; 144 int pam_silent = PAM_SILENT; 145 pid_t xpid, pid; 146 int status; 147 char *saved_term; 148 char **pamenv; 149 150 tbuf[0] = '\0'; 151 pwprompt = NULL; 152 nested = NULL; 153 need_chpass = require_chpass = 0; 154 155 (void)signal(SIGALRM, timedout); 156 (void)alarm(timeout); 157 (void)signal(SIGQUIT, SIG_IGN); 158 (void)signal(SIGINT, SIG_IGN); 159 (void)setpriority(PRIO_PROCESS, 0, 0); 160 161 openlog("login", 0, LOG_AUTH); 162 163 /* 164 * -p is used by getty to tell login not to destroy the environment 165 * -f is used to skip a second login authentication 166 * -h is used by other servers to pass the name of the remote host to 167 * login so that it may be placed in utmp/utmpx and wtmp/wtmpx 168 * -a in addition to -h, a server my supply -a to pass the actual 169 * server address. 170 * -s is used to force use of S/Key or equivalent. 171 */ 172 domain = NULL; 173 if (gethostname(localhost, sizeof(localhost)) < 0) 174 syslog(LOG_ERR, "couldn't get local hostname: %m"); 175 else 176 domain = strchr(localhost, '.'); 177 localhost[sizeof(localhost) - 1] = '\0'; 178 179 Fflag = fflag = hflag = pflag = sflag = 0; 180 have_ss = 0; 181 uid = getuid(); 182 while ((ch = getopt(argc, argv, "a:Ffh:ps")) != -1) 183 switch (ch) { 184 case 'a': 185 if (uid) { 186 errno = EPERM; 187 err(EXIT_FAILURE, "-a option"); 188 } 189 decode_ss(optarg); 190 #ifdef notdef 191 (void)sockaddr_snprintf(optarg, 192 sizeof(struct sockaddr_storage), "%a", (void *)&ss); 193 #endif 194 break; 195 case 'F': 196 Fflag = 1; 197 /* FALLTHROUGH */ 198 case 'f': 199 fflag = 1; 200 break; 201 case 'h': 202 if (uid) { 203 errno = EPERM; 204 err(EXIT_FAILURE, "-h option"); 205 } 206 hflag = 1; 207 if (domain && (p = strchr(optarg, '.')) != NULL && 208 strcasecmp(p, domain) == 0) 209 *p = '\0'; 210 hostname = optarg; 211 break; 212 case 'p': 213 pflag = 1; 214 break; 215 case 's': 216 sflag = 1; 217 break; 218 default: 219 case '?': 220 usage(); 221 break; 222 } 223 224 setproctitle(NULL); 225 argc -= optind; 226 argv += optind; 227 228 if (*argv) { 229 username = *argv; 230 ask = 0; 231 } else 232 ask = 1; 233 234 #ifdef F_CLOSEM 235 (void)fcntl(3, F_CLOSEM, 0); 236 #else 237 for (cnt = getdtablesize(); cnt > 2; cnt--) 238 (void)close(cnt); 239 #endif 240 241 ttyn = ttyname(STDIN_FILENO); 242 if (ttyn == NULL || *ttyn == '\0') { 243 (void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY); 244 ttyn = tname; 245 } 246 if ((tty = strstr(ttyn, "/pts/")) != NULL) 247 ++tty; 248 else if ((tty = strrchr(ttyn, '/')) != NULL) 249 ++tty; 250 else 251 tty = ttyn; 252 253 if (issetugid()) { 254 nested = strdup(user_from_uid(getuid(), 0)); 255 if (nested == NULL) { 256 syslog(LOG_ERR, "strdup: %m"); 257 sleepexit(EXIT_FAILURE); 258 } 259 } 260 261 /* Get "login-retries" and "login-backoff" from default class */ 262 if ((lc = login_getclass(NULL)) != NULL) { 263 login_retries = (int)login_getcapnum(lc, "login-retries", 264 DEFAULT_RETRIES, DEFAULT_RETRIES); 265 login_backoff = (int)login_getcapnum(lc, "login-backoff", 266 DEFAULT_BACKOFF, DEFAULT_BACKOFF); 267 login_close(lc); 268 lc = NULL; 269 } 270 271 272 for (cnt = 0;; ask = 1) { 273 if (ask) { 274 fflag = 0; 275 getloginname(); 276 } 277 rootlogin = 0; 278 auth_passed = 0; 279 if (strlen(username) > MAXLOGNAME) 280 username[MAXLOGNAME] = '\0'; 281 282 /* 283 * Note if trying multiple user names; log failures for 284 * previous user name, but don't bother logging one failure 285 * for nonexistent name (mistyped username). 286 */ 287 if (failures && strcmp(tbuf, username)) { 288 if (failures > (pwd ? 0 : 1)) 289 badlogin(tbuf); 290 failures = 0; 291 } 292 293 #define PAM_END(msg) do { \ 294 syslog(LOG_ERR, "%s: %s", msg, pam_strerror(pamh, pam_err)); \ 295 warnx("%s: %s", msg, pam_strerror(pamh, pam_err)); \ 296 pam_end(pamh, pam_err); \ 297 sleepexit(EXIT_FAILURE); \ 298 } while (/*CONSTCOND*/0) 299 300 pam_err = pam_start("login", username, &pamc, &pamh); 301 if (pam_err != PAM_SUCCESS) { 302 if (pamh != NULL) 303 PAM_END("pam_start"); 304 /* Things went really bad... */ 305 syslog(LOG_ERR, "pam_start failed: %s", 306 pam_strerror(pamh, pam_err)); 307 errx(EXIT_FAILURE, "pam_start failed"); 308 } 309 310 #define PAM_SET_ITEM(item, var) do { \ 311 pam_err = pam_set_item(pamh, (item), (var)); \ 312 if (pam_err != PAM_SUCCESS) \ 313 PAM_END("pam_set_item(" # item ")"); \ 314 } while (/*CONSTCOND*/0) 315 316 /* 317 * Fill hostname tty, and nested user 318 */ 319 PAM_SET_ITEM(PAM_RHOST, hostname); 320 PAM_SET_ITEM(PAM_TTY, tty); 321 if (nested) 322 PAM_SET_ITEM(PAM_NUSER, nested); 323 if (have_ss) 324 PAM_SET_ITEM(PAM_SOCKADDR, &ss); 325 326 /* 327 * Don't check for errors, because we don't want to give 328 * out any information. 329 */ 330 pwd = NULL; 331 (void)getpwnam_r(username, &pwres, pwbuf, sizeof(pwbuf), &pwd); 332 333 /* 334 * Establish the class now, before we might goto 335 * within the next block. pwd can be NULL since it 336 * falls back to the "default" class if it is. 337 */ 338 lc = login_getclass(pwd ? pwd->pw_class : NULL); 339 340 /* 341 * if we have a valid account name, and it doesn't have a 342 * password, or the -f option was specified and the caller 343 * is root or the caller isn't changing their uid, don't 344 * authenticate. 345 */ 346 if (pwd) { 347 if (pwd->pw_uid == 0) 348 rootlogin = 1; 349 350 if (fflag && (uid == 0 || uid == pwd->pw_uid)) { 351 /* already authenticated */ 352 auth_passed = 1; 353 goto skip_auth; 354 } 355 } 356 357 (void)setpriority(PRIO_PROCESS, 0, -4); 358 359 switch(pam_err = pam_authenticate(pamh, pam_silent)) { 360 case PAM_SUCCESS: 361 /* 362 * PAM can change the user, refresh 363 * username, pwd, and lc. 364 */ 365 pam_err = pam_get_item(pamh, PAM_USER, &newuser); 366 if (pam_err != PAM_SUCCESS) 367 PAM_END("pam_get_item(PAM_USER)"); 368 369 username = (char *)newuser; 370 /* 371 * Don't check for errors, because we don't want to give 372 * out any information. 373 */ 374 pwd = NULL; 375 (void)getpwnam_r(username, &pwres, pwbuf, sizeof(pwbuf), 376 &pwd); 377 lc = login_getpwclass(pwd); 378 auth_passed = 1; 379 380 switch (pam_err = pam_acct_mgmt(pamh, pam_silent)) { 381 case PAM_SUCCESS: 382 break; 383 384 case PAM_NEW_AUTHTOK_REQD: 385 pam_err = pam_chauthtok(pamh, 386 pam_silent|PAM_CHANGE_EXPIRED_AUTHTOK); 387 388 if (pam_err != PAM_SUCCESS) 389 PAM_END("pam_chauthtok"); 390 break; 391 392 default: 393 PAM_END("pam_acct_mgmt"); 394 break; 395 } 396 break; 397 398 case PAM_AUTH_ERR: 399 case PAM_USER_UNKNOWN: 400 case PAM_MAXTRIES: 401 auth_passed = 0; 402 break; 403 404 default: 405 PAM_END("pam_authenticate"); 406 break; 407 } 408 409 (void)setpriority(PRIO_PROCESS, 0, 0); 410 411 skip_auth: 412 /* 413 * If the user exists and authentication passed, 414 * get out of the loop and login the user. 415 */ 416 if (pwd && auth_passed) 417 break; 418 419 (void)printf("Login incorrect\n"); 420 failures++; 421 cnt++; 422 /* we allow 10 tries, but after 3 we start backing off */ 423 if (cnt > login_backoff) { 424 if (cnt >= login_retries) { 425 badlogin(username); 426 pam_end(pamh, PAM_SUCCESS); 427 sleepexit(EXIT_FAILURE); 428 } 429 sleep((u_int)((cnt - 3) * 5)); 430 } 431 } 432 433 /* committed to login -- turn off timeout */ 434 (void)alarm((u_int)0); 435 436 endpwent(); 437 438 quietlog = login_getcapbool(lc, "hushlogin", 0); 439 440 /* 441 * Temporarily give up special privileges so we can change 442 * into NFS-mounted homes that are exported for non-root 443 * access and have mode 7x0 444 */ 445 saved_uid = geteuid(); 446 saved_gid = getegid(); 447 nsaved_gids = getgroups(NGROUPS_MAX, saved_gids); 448 449 (void)setegid(pwd->pw_gid); 450 initgroups(username, pwd->pw_gid); 451 (void)seteuid(pwd->pw_uid); 452 453 if (chdir(pwd->pw_dir) != 0) { 454 if (login_getcapbool(lc, "requirehome", 0)) { 455 (void)printf("Home directory %s required\n", 456 pwd->pw_dir); 457 pam_end(pamh, PAM_SUCCESS); 458 exit(EXIT_FAILURE); 459 } 460 461 (void)printf("No home directory %s!\n", pwd->pw_dir); 462 if (chdir("/")) { 463 pam_end(pamh, PAM_SUCCESS); 464 exit(EXIT_SUCCESS); 465 } 466 pwd->pw_dir = "/"; 467 (void)printf("Logging in with home = \"/\".\n"); 468 } 469 470 if (!quietlog) { 471 quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0; 472 pam_silent = 0; 473 } 474 475 /* regain special privileges */ 476 setegid(saved_gid); 477 setgroups(nsaved_gids, saved_gids); 478 seteuid(saved_uid); 479 480 (void)getgrnam_r(TTYGRPNAME, &grs, grbuf, sizeof(grbuf), &grp); 481 (void)chown(ttyn, pwd->pw_uid, 482 (grp != NULL) ? grp->gr_gid : pwd->pw_gid); 483 484 if (ttyaction(ttyn, "login", pwd->pw_name)) 485 (void)printf("Warning: ttyaction failed.\n"); 486 487 /* Nothing else left to fail -- really log in. */ 488 update_db(quietlog); 489 490 if (nested == NULL && setusercontext(lc, pwd, pwd->pw_uid, 491 LOGIN_SETLOGIN) != 0) { 492 syslog(LOG_ERR, "setusercontext failed"); 493 pam_end(pamh, PAM_SUCCESS); 494 exit(EXIT_FAILURE); 495 } 496 497 if (tty[sizeof("tty")-1] == 'd') 498 syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name); 499 500 /* If fflag is on, assume caller/authenticator has logged root login. */ 501 if (rootlogin && fflag == 0) { 502 if (hostname) 503 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s", 504 username, tty, hostname); 505 else 506 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", 507 username, tty); 508 } 509 510 /* 511 * Establish groups 512 */ 513 if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETGROUP) != 0) { 514 syslog(LOG_ERR, "setusercontext failed"); 515 pam_end(pamh, PAM_SUCCESS); 516 exit(EXIT_FAILURE); 517 } 518 519 pam_err = pam_setcred(pamh, pam_silent|PAM_ESTABLISH_CRED); 520 if (pam_err != PAM_SUCCESS) 521 PAM_END("pam_setcred"); 522 523 pam_err = pam_open_session(pamh, pam_silent); 524 if (pam_err != PAM_SUCCESS) 525 PAM_END("pam_open_session"); 526 527 /* 528 * Fork because we need to call pam_closesession as root. 529 * Make sure signals cannot kill the parent. 530 * This is copied from crontab(8), which has to 531 * cope with a similar situation. 532 */ 533 oint = signal(SIGINT, SIG_IGN); 534 oabrt = signal(SIGABRT, SIG_IGN); 535 536 switch(pid = fork()) { 537 case -1: 538 pam_err = pam_close_session(pamh, 0); 539 if (pam_err != PAM_SUCCESS) { 540 syslog(LOG_ERR, "pam_close_session: %s", 541 pam_strerror(pamh, pam_err)); 542 warnx("pam_close_session: %s", 543 pam_strerror(pamh, pam_err)); 544 } 545 syslog(LOG_ERR, "fork failed: %m"); 546 warn("fork failed"); 547 pam_end(pamh, pam_err); 548 exit(EXIT_FAILURE); 549 break; 550 551 case 0: /* Child */ 552 break; 553 554 default: 555 /* 556 * Parent: wait for the child to terminate 557 * and call pam_close_session. 558 */ 559 if ((xpid = waitpid(pid, &status, 0)) != pid) { 560 pam_err = pam_close_session(pamh, 0); 561 if (pam_err != PAM_SUCCESS) { 562 syslog(LOG_ERR, 563 "pam_close_session: %s", 564 pam_strerror(pamh, pam_err)); 565 warnx("pam_close_session: %s", 566 pam_strerror(pamh, pam_err)); 567 } 568 pam_end(pamh, pam_err); 569 if (xpid != -1) 570 warnx("wrong PID: %d != %d", pid, xpid); 571 else 572 warn("wait for pid %d failed", pid); 573 exit(EXIT_FAILURE); 574 } 575 576 (void)signal(SIGINT, oint); 577 (void)signal(SIGABRT, oabrt); 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 (void)signal(SIGALRM, SIG_DFL); 676 (void)signal(SIGQUIT, SIG_DFL); 677 (void)signal(SIGINT, SIG_DFL); 678 (void)signal(SIGTSTP, SIG_IGN); 679 680 tbuf[0] = '-'; 681 (void)strlcpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ? 682 p + 1 : pwd->pw_shell, sizeof(tbuf) - 1); 683 684 execlp(pwd->pw_shell, tbuf, NULL); 685 err(EXIT_FAILURE, "%s", pwd->pw_shell); 686 } 687 688 #define NBUFSIZ (MAXLOGNAME + 1) 689 690 691 void 692 getloginname(void) 693 { 694 int ch; 695 char *p; 696 static char nbuf[NBUFSIZ]; 697 698 for (;;) { 699 (void)printf("login: "); 700 for (p = nbuf; (ch = getchar()) != '\n'; ) { 701 if (ch == EOF) { 702 badlogin(username); 703 exit(EXIT_SUCCESS); 704 } 705 if (p < nbuf + (NBUFSIZ - 1)) 706 *p++ = ch; 707 } 708 if (p > nbuf) { 709 if (nbuf[0] == '-') 710 (void)fprintf(stderr, 711 "login names may not start with '-'.\n"); 712 else { 713 *p = '\0'; 714 username = nbuf; 715 break; 716 } 717 } 718 } 719 } 720 721 int 722 rootterm(char *ttyn) 723 { 724 struct ttyent *t; 725 726 return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE); 727 } 728 729 jmp_buf motdinterrupt; 730 731 void 732 motd(char *fname) 733 { 734 int fd, nchars; 735 sig_t oldint; 736 char tbuf[8192]; 737 738 if ((fd = open(fname ? fname : _PATH_MOTDFILE, O_RDONLY, 0)) < 0) 739 return; 740 oldint = signal(SIGINT, sigint); 741 if (setjmp(motdinterrupt) == 0) 742 while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0) 743 (void)write(fileno(stdout), tbuf, nchars); 744 (void)signal(SIGINT, oldint); 745 (void)close(fd); 746 } 747 748 /* ARGSUSED */ 749 void 750 sigint(int signo) 751 { 752 753 longjmp(motdinterrupt, 1); 754 } 755 756 /* ARGSUSED */ 757 void 758 timedout(int signo) 759 { 760 761 (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout); 762 exit(EXIT_SUCCESS); 763 } 764 765 static void 766 update_db(int quietlog) 767 { 768 if (nested != NULL) { 769 if (hostname != NULL) 770 syslog(LOG_NOTICE, "%s to %s on tty %s from %s", 771 nested, pwd->pw_name, tty, hostname); 772 else 773 syslog(LOG_NOTICE, "%s to %s on tty %s", nested, 774 pwd->pw_name, tty); 775 776 } 777 if (hostname != NULL && have_ss == 0) { 778 socklen_t len = sizeof(ss); 779 (void)getpeername(STDIN_FILENO, (struct sockaddr *)&ss, &len); 780 } 781 (void)gettimeofday(&now, NULL); 782 } 783 784 void 785 badlogin(char *name) 786 { 787 788 if (failures == 0) 789 return; 790 if (hostname) { 791 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s", 792 failures, failures > 1 ? "S" : "", hostname); 793 syslog(LOG_AUTHPRIV|LOG_NOTICE, 794 "%d LOGIN FAILURE%s FROM %s, %s", 795 failures, failures > 1 ? "S" : "", hostname, name); 796 } else { 797 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s", 798 failures, failures > 1 ? "S" : "", tty); 799 syslog(LOG_AUTHPRIV|LOG_NOTICE, 800 "%d LOGIN FAILURE%s ON %s, %s", 801 failures, failures > 1 ? "S" : "", tty, name); 802 } 803 } 804 805 const char * 806 stypeof(const char *ttyid) 807 { 808 struct ttyent *t; 809 810 return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : NULL); 811 } 812 813 void 814 sleepexit(int eval) 815 { 816 817 (void)sleep(5); 818 exit(eval); 819 } 820 821 void 822 decode_ss(const char *arg) 823 { 824 struct sockaddr_storage *ssp; 825 size_t len = strlen(arg); 826 827 if (len > sizeof(*ssp) * 4 + 1 || len < sizeof(*ssp)) 828 errx(EXIT_FAILURE, "Bad argument"); 829 830 if ((ssp = malloc(len)) == NULL) 831 err(EXIT_FAILURE, NULL); 832 833 if (strunvis((char *)ssp, arg) != sizeof(*ssp)) 834 errx(EXIT_FAILURE, "Decoding error"); 835 836 (void)memcpy(&ss, ssp, sizeof(ss)); 837 have_ss = 1; 838 } 839 840 void 841 usage(void) 842 { 843 (void)fprintf(stderr, 844 "Usage: %s [-Ffps] [-a address] [-h hostname] [username]\n", 845 getprogname()); 846 exit(EXIT_FAILURE); 847 } 848
Indexes created Tue Sep 30 20:09:53 GMT 2025