login_pam.c revision 1.13
1 /* $NetBSD: login_pam.c,v 1.13 2006/03/06 23:06:18 jnemeth 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 1.13 2006/03/06 23:06:18 jnemeth 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, pflag, quietlog, rootlogin; 126 int auth_passed; 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 */ 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 /* we allow 10 tries, but after 3 we start backing off */ 420 if (cnt > login_backoff) { 421 if (cnt >= login_retries) { 422 badlogin(username); 423 pam_end(pamh, PAM_SUCCESS); 424 sleepexit(EXIT_FAILURE); 425 } 426 sleep((u_int)((cnt - 3) * 5)); 427 } 428 } 429 430 /* committed to login -- turn off timeout */ 431 (void)alarm((u_int)0); 432 433 endpwent(); 434 435 quietlog = login_getcapbool(lc, "hushlogin", 0); 436 437 /* 438 * Temporarily give up special privileges so we can change 439 * into NFS-mounted homes that are exported for non-root 440 * access and have mode 7x0 441 */ 442 saved_uid = geteuid(); 443 saved_gid = getegid(); 444 nsaved_gids = getgroups(NGROUPS_MAX, saved_gids); 445 446 (void)setegid(pwd->pw_gid); 447 initgroups(username, pwd->pw_gid); 448 (void)seteuid(pwd->pw_uid); 449 450 if (chdir(pwd->pw_dir) != 0) { 451 if (login_getcapbool(lc, "requirehome", 0)) { 452 (void)printf("Home directory %s required\n", 453 pwd->pw_dir); 454 pam_end(pamh, PAM_SUCCESS); 455 exit(EXIT_FAILURE); 456 } 457 458 (void)printf("No home directory %s!\n", pwd->pw_dir); 459 if (chdir("/")) { 460 pam_end(pamh, PAM_SUCCESS); 461 exit(EXIT_SUCCESS); 462 } 463 pwd->pw_dir = "/"; 464 (void)printf("Logging in with home = \"/\".\n"); 465 } 466 467 if (!quietlog) { 468 quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0; 469 pam_silent = quietlog ? PAM_SILENT : 0; 470 } 471 472 /* regain special privileges */ 473 setegid(saved_gid); 474 setgroups(nsaved_gids, saved_gids); 475 seteuid(saved_uid); 476 477 (void)getgrnam_r(TTYGRPNAME, &grs, grbuf, sizeof(grbuf), &grp); 478 (void)chown(ttyn, pwd->pw_uid, 479 (grp != NULL) ? grp->gr_gid : pwd->pw_gid); 480 481 if (ttyaction(ttyn, "login", pwd->pw_name)) 482 (void)printf("Warning: ttyaction failed.\n"); 483 484 /* Nothing else left to fail -- really log in. */ 485 update_db(quietlog); 486 487 if (nested == NULL && setusercontext(lc, pwd, pwd->pw_uid, 488 LOGIN_SETLOGIN) != 0) { 489 syslog(LOG_ERR, "setusercontext failed"); 490 pam_end(pamh, PAM_SUCCESS); 491 exit(EXIT_FAILURE); 492 } 493 494 if (tty[sizeof("tty")-1] == 'd') 495 syslog(LOG_INFO, "DIALUP %s, %s", tty, pwd->pw_name); 496 497 /* If fflag is on, assume caller/authenticator has logged root login. */ 498 if (rootlogin && fflag == 0) { 499 if (hostname) 500 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s", 501 username, tty, hostname); 502 else 503 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s", 504 username, tty); 505 } 506 507 /* 508 * Establish groups 509 */ 510 if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETGROUP) != 0) { 511 syslog(LOG_ERR, "setusercontext failed"); 512 pam_end(pamh, PAM_SUCCESS); 513 exit(EXIT_FAILURE); 514 } 515 516 pam_err = pam_setcred(pamh, pam_silent|PAM_ESTABLISH_CRED); 517 if (pam_err != PAM_SUCCESS) 518 PAM_END("pam_setcred"); 519 520 pam_err = pam_open_session(pamh, pam_silent); 521 if (pam_err != PAM_SUCCESS) 522 PAM_END("pam_open_session"); 523 524 /* 525 * Fork because we need to call pam_closesession as root. 526 * Make sure signals cannot kill the parent. 527 * This is copied from crontab(8), which has to 528 * cope with a similar situation. 529 */ 530 oint = signal(SIGINT, SIG_IGN); 531 oabrt = signal(SIGABRT, SIG_IGN); 532 533 switch(pid = fork()) { 534 case -1: 535 pam_err = pam_close_session(pamh, 0); 536 if (pam_err != PAM_SUCCESS) { 537 syslog(LOG_ERR, "pam_close_session: %s", 538 pam_strerror(pamh, pam_err)); 539 warnx("pam_close_session: %s", 540 pam_strerror(pamh, pam_err)); 541 } 542 syslog(LOG_ERR, "fork failed: %m"); 543 warn("fork failed"); 544 pam_end(pamh, pam_err); 545 exit(EXIT_FAILURE); 546 break; 547 548 case 0: /* Child */ 549 break; 550 551 default: 552 /* 553 * Parent: wait for the child to terminate 554 * and call pam_close_session. 555 */ 556 if ((xpid = waitpid(pid, &status, 0)) != pid) { 557 pam_err = pam_close_session(pamh, 0); 558 if (pam_err != PAM_SUCCESS) { 559 syslog(LOG_ERR, 560 "pam_close_session: %s", 561 pam_strerror(pamh, pam_err)); 562 warnx("pam_close_session: %s", 563 pam_strerror(pamh, pam_err)); 564 } 565 pam_end(pamh, pam_err); 566 if (xpid != -1) 567 warnx("wrong PID: %d != %d", pid, xpid); 568 else 569 warn("wait for pid %d failed", pid); 570 exit(EXIT_FAILURE); 571 } 572 573 (void)signal(SIGINT, oint); 574 (void)signal(SIGABRT, oabrt); 575 if ((pam_err = pam_close_session(pamh, 0)) != PAM_SUCCESS) { 576 syslog(LOG_ERR, "pam_close_session: %s", 577 pam_strerror(pamh, pam_err)); 578 warnx("pam_close_session: %s", 579 pam_strerror(pamh, pam_err)); 580 } 581 pam_end(pamh, PAM_SUCCESS); 582 exit(EXIT_SUCCESS); 583 break; 584 } 585 586 /* 587 * The child: starting here, we don't have to care about 588 * handling PAM issues if we exit, the parent will do the 589 * job when we exit. 590 * 591 * Destroy environment unless user has requested its preservation. 592 * Try to preserve TERM anyway. 593 */ 594 saved_term = getenv("TERM"); 595 if (!pflag) { 596 environ = envinit; 597 if (saved_term) 598 setenv("TERM", saved_term, 0); 599 } 600 601 if (*pwd->pw_shell == '\0') 602 pwd->pw_shell = _PATH_BSHELL; 603 604 shell = login_getcapstr(lc, "shell", pwd->pw_shell, pwd->pw_shell); 605 if (*shell == '\0') 606 shell = pwd->pw_shell; 607 608 if ((pwd->pw_shell = strdup(shell)) == NULL) { 609 syslog(LOG_ERR, "Cannot alloc mem"); 610 exit(EXIT_FAILURE); 611 } 612 613 (void)setenv("HOME", pwd->pw_dir, 1); 614 (void)setenv("SHELL", pwd->pw_shell, 1); 615 if (term[0] == '\0') { 616 char *tt = (char *)stypeof(tty); 617 618 if (tt == NULL) 619 tt = login_getcapstr(lc, "term", NULL, NULL); 620 621 /* unknown term -> "su" */ 622 (void)strlcpy(term, tt != NULL ? tt : "su", sizeof(term)); 623 } 624 (void)setenv("TERM", term, 0); 625 (void)setenv("LOGNAME", pwd->pw_name, 1); 626 (void)setenv("USER", pwd->pw_name, 1); 627 628 /* 629 * Add PAM environement 630 */ 631 if ((pamenv = pam_getenvlist(pamh)) != NULL) { 632 char **envitem; 633 634 for (envitem = pamenv; *envitem; envitem++) { 635 putenv(*envitem); 636 free(*envitem); 637 } 638 639 free(pamenv); 640 } 641 642 /* This drops root privs */ 643 if (setusercontext(lc, pwd, pwd->pw_uid, 644 (LOGIN_SETALL & ~LOGIN_SETLOGIN)) != 0) { 645 syslog(LOG_ERR, "setusercontext failed"); 646 exit(EXIT_FAILURE); 647 } 648 649 if (!quietlog) { 650 char *fname; 651 652 fname = login_getcapstr(lc, "copyright", NULL, NULL); 653 if (fname != NULL && access(fname, F_OK) == 0) 654 motd(fname); 655 else 656 (void)printf("%s", copyrightstr); 657 658 fname = login_getcapstr(lc, "welcome", NULL, NULL); 659 if (fname == NULL || access(fname, F_OK) != 0) 660 fname = _PATH_MOTDFILE; 661 motd(fname); 662 663 (void)snprintf(tbuf, 664 sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pwd->pw_name); 665 if (stat(tbuf, &st) == 0 && st.st_size != 0) 666 (void)printf("You have %smail.\n", 667 (st.st_mtime > st.st_atime) ? "new " : ""); 668 } 669 670 login_close(lc); 671 672 (void)signal(SIGALRM, SIG_DFL); 673 (void)signal(SIGQUIT, SIG_DFL); 674 (void)signal(SIGINT, SIG_DFL); 675 (void)signal(SIGTSTP, SIG_IGN); 676 677 tbuf[0] = '-'; 678 (void)strlcpy(tbuf + 1, (p = strrchr(pwd->pw_shell, '/')) ? 679 p + 1 : pwd->pw_shell, sizeof(tbuf) - 1); 680 681 execlp(pwd->pw_shell, tbuf, NULL); 682 err(EXIT_FAILURE, "%s", pwd->pw_shell); 683 } 684 685 #define NBUFSIZ (MAXLOGNAME + 1) 686 687 688 void 689 getloginname(void) 690 { 691 int ch; 692 char *p; 693 static char nbuf[NBUFSIZ]; 694 695 for (;;) { 696 (void)printf("login: "); 697 for (p = nbuf; (ch = getchar()) != '\n'; ) { 698 if (ch == EOF) { 699 badlogin(username); 700 exit(EXIT_SUCCESS); 701 } 702 if (p < nbuf + (NBUFSIZ - 1)) 703 *p++ = ch; 704 } 705 if (p > nbuf) { 706 if (nbuf[0] == '-') 707 (void)fprintf(stderr, 708 "login names may not start with '-'.\n"); 709 else { 710 *p = '\0'; 711 username = nbuf; 712 break; 713 } 714 } 715 } 716 } 717 718 int 719 rootterm(char *ttyn) 720 { 721 struct ttyent *t; 722 723 return ((t = getttynam(ttyn)) && t->ty_status & TTY_SECURE); 724 } 725 726 jmp_buf motdinterrupt; 727 728 void 729 motd(char *fname) 730 { 731 int fd, nchars; 732 sig_t oldint; 733 char tbuf[8192]; 734 735 if ((fd = open(fname ? fname : _PATH_MOTDFILE, O_RDONLY, 0)) < 0) 736 return; 737 oldint = signal(SIGINT, sigint); 738 if (setjmp(motdinterrupt) == 0) 739 while ((nchars = read(fd, tbuf, sizeof(tbuf))) > 0) 740 (void)write(fileno(stdout), tbuf, nchars); 741 (void)signal(SIGINT, oldint); 742 (void)close(fd); 743 } 744 745 /* ARGSUSED */ 746 void 747 sigint(int signo) 748 { 749 750 longjmp(motdinterrupt, 1); 751 } 752 753 /* ARGSUSED */ 754 void 755 timedout(int signo) 756 { 757 758 (void)fprintf(stderr, "Login timed out after %d seconds\n", timeout); 759 exit(EXIT_SUCCESS); 760 } 761 762 static void 763 update_db(int quietlog) 764 { 765 if (nested != NULL) { 766 if (hostname != NULL) 767 syslog(LOG_NOTICE, "%s to %s on tty %s from %s", 768 nested, pwd->pw_name, tty, hostname); 769 else 770 syslog(LOG_NOTICE, "%s to %s on tty %s", nested, 771 pwd->pw_name, tty); 772 773 } 774 if (hostname != NULL && have_ss == 0) { 775 socklen_t len = sizeof(ss); 776 have_ss = getpeername(STDIN_FILENO, (struct sockaddr *)&ss, 777 &len) != -1; 778 } 779 (void)gettimeofday(&now, NULL); 780 } 781 782 void 783 badlogin(char *name) 784 { 785 786 if (failures == 0) 787 return; 788 if (hostname) { 789 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s", 790 failures, failures > 1 ? "S" : "", hostname); 791 syslog(LOG_AUTHPRIV|LOG_NOTICE, 792 "%d LOGIN FAILURE%s FROM %s, %s", 793 failures, failures > 1 ? "S" : "", hostname, name); 794 } else { 795 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s", 796 failures, failures > 1 ? "S" : "", tty); 797 syslog(LOG_AUTHPRIV|LOG_NOTICE, 798 "%d LOGIN FAILURE%s ON %s, %s", 799 failures, failures > 1 ? "S" : "", tty, name); 800 } 801 } 802 803 const char * 804 stypeof(const char *ttyid) 805 { 806 struct ttyent *t; 807 808 return (ttyid && (t = getttynam(ttyid)) ? t->ty_type : NULL); 809 } 810 811 void 812 sleepexit(int eval) 813 { 814 815 (void)sleep(5); 816 exit(eval); 817 } 818 819 void 820 decode_ss(const char *arg) 821 { 822 struct sockaddr_storage *ssp; 823 size_t len = strlen(arg); 824 825 if (len > sizeof(*ssp) * 4 + 1 || len < sizeof(*ssp)) 826 errx(EXIT_FAILURE, "Bad argument"); 827 828 if ((ssp = malloc(len)) == NULL) 829 err(EXIT_FAILURE, NULL); 830 831 if (strunvis((char *)ssp, arg) != sizeof(*ssp)) 832 errx(EXIT_FAILURE, "Decoding error"); 833 834 (void)memcpy(&ss, ssp, sizeof(ss)); 835 have_ss = 1; 836 } 837 838 void 839 usage(void) 840 { 841 (void)fprintf(stderr, 842 "Usage: %s [-fp] [-a address] [-h hostname] [username]\n", 843 getprogname()); 844 exit(EXIT_FAILURE); 845 } 846
Indexes created Tue Sep 30 11:09:46 GMT 2025