2 * Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (c) 2002 Networks Associates Technologies, Inc.
7 * Portions of this software were developed for the FreeBSD Project by
8 * ThinkSec AS and NAI Labs, the Security Research Division of Network
9 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
10 * ("CBOSS"), as part of the DARPA CHATS research program.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by the University of
23 * California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
43 static char sccsid[] = "@(#)login.c 8.4 (Berkeley) 4/2/94";
47 #include <sys/cdefs.h>
48 __FBSDID("$FreeBSD$");
52 * login -h hostname (for telnetd, etc.)
53 * login -f name (for pre-authenticated login: datakit, xterm, etc.)
56 #include <sys/param.h>
60 #include <sys/resource.h>
67 #include <login_cap.h>
78 #include <security/pam_appl.h>
79 #include <security/openpam.h>
82 #include "pathnames.h"
84 static int auth_pam(void);
85 static void bail(int, int);
86 static void bail_internal(int, int, int);
87 static int export(const char *);
88 static void export_pam_environment(void);
89 static int motd(const char *);
90 static void badlogin(char *);
91 static char *getloginname(void);
92 static void pam_syslog(const char *);
93 static void pam_cleanup(void);
94 static void refused(const char *, const char *, int);
95 static const char *stypeof(char *);
96 static void sigint(int);
97 static void timedout(int);
98 static void bail_sig(int);
99 static void usage(void);
101 #define TTYGRPNAME "tty" /* group to own ttys */
102 #define DEFAULT_BACKOFF 3
103 #define DEFAULT_RETRIES 10
104 #define DEFAULT_PROMPT "login: "
105 #define DEFAULT_PASSWD_PROMPT "Password:"
106 #define TERM_UNKNOWN "su"
107 #define DEFAULT_WARN (2L * 7L * 86400L) /* Two weeks */
108 #define NO_SLEEP_EXIT 0
112 * This bounds the time given to login. Not a define so it can
113 * be patched on machines where it's too small.
115 static u_int timeout = 300;
117 /* Buffer for signal handling of timeout */
118 static jmp_buf timeout_buf;
123 static char *envinit[1]; /* empty environment list */
126 * Command line flags and arguments
128 static int fflag; /* -f: do not perform authentication */
129 static int hflag; /* -h: login from remote host */
130 static char *hostname; /* hostname from command line */
131 static int pflag; /* -p: preserve environment */
136 static char *username; /* user name */
137 static char *olduser; /* previous user name */
142 static char default_prompt[] = DEFAULT_PROMPT;
143 static const char *prompt;
144 static char default_passwd_prompt[] = DEFAULT_PASSWD_PROMPT;
145 static const char *passwd_prompt;
152 static pam_handle_t *pamh = NULL;
153 static struct pam_conv pamc = { openpam_ttyconv, NULL };
155 static int pam_silent = PAM_SILENT;
156 static int pam_cred_established;
157 static int pam_session_established;
160 main(int argc, char *argv[])
164 int retries, backoff;
165 int ask, ch, cnt, quietlog, rootlogin, rval;
170 char tname[sizeof(_PATH_TTY) + 10];
173 const char *shell = NULL;
174 login_cap_t *lc = NULL;
175 login_cap_t *lc_user = NULL;
177 sigset_t mask, omask;
180 char auditsuccess = 1;
183 sa.sa_flags = SA_RESTART;
184 (void)sigfillset(&sa.sa_mask);
185 sa.sa_handler = SIG_IGN;
186 (void)sigaction(SIGQUIT, &sa, NULL);
187 (void)sigaction(SIGINT, &sa, NULL);
188 (void)sigaction(SIGHUP, &sa, NULL);
189 if (setjmp(timeout_buf)) {
192 (void)fprintf(stderr, "Login timed out after %d seconds\n",
194 bail(NO_SLEEP_EXIT, 0);
196 sa.sa_handler = timedout;
197 (void)sigaction(SIGALRM, &sa, NULL);
198 (void)alarm(timeout);
199 (void)setpriority(PRIO_PROCESS, 0, 0);
201 openlog("login", 0, LOG_AUTH);
207 while ((ch = getopt(argc, argv, "fh:p")) != -1)
214 errx(1, "-h option: %s", strerror(EPERM));
215 if (strlen(optarg) >= MAXHOSTNAMELEN)
216 errx(1, "-h option: %s: exceeds maximum "
217 "hostname size", optarg);
227 syslog(LOG_ERR, "invalid flag %c", ch);
234 username = strdup(*argv);
235 if (username == NULL)
242 setproctitle("-%s", getprogname());
249 ttyn = ttyname(STDIN_FILENO);
250 if (ttyn == NULL || *ttyn == '\0') {
251 (void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY);
254 if (strncmp(ttyn, _PATH_DEV, sizeof _PATH_DEV - 1) == 0)
255 tty = ttyn + sizeof _PATH_DEV - 1;
260 * Get "login-retries" & "login-backoff" from default class
262 lc = login_getclass(NULL);
263 prompt = login_getcapstr(lc, "login_prompt",
264 default_prompt, default_prompt);
265 passwd_prompt = login_getcapstr(lc, "passwd_prompt",
266 default_passwd_prompt, default_passwd_prompt);
267 retries = login_getcapnum(lc, "login-retries",
268 DEFAULT_RETRIES, DEFAULT_RETRIES);
269 backoff = login_getcapnum(lc, "login-backoff",
270 DEFAULT_BACKOFF, DEFAULT_BACKOFF);
275 * Try to authenticate the user until we succeed or time out.
277 for (cnt = 0;; ask = 1) {
283 username = getloginname();
288 * Note if trying multiple user names; log failures for
289 * previous user name, but don't bother logging one failure
290 * for nonexistent name (mistyped username).
292 if (failures && strcmp(olduser, username) != 0) {
293 if (failures > (pwd ? 0 : 1))
298 * Load the PAM policy and set some variables
300 pam_err = pam_start("login", username, &pamc, &pamh);
301 if (pam_err != PAM_SUCCESS) {
302 pam_syslog("pam_start()");
304 au_login_fail("PAM Error", 1);
306 bail(NO_SLEEP_EXIT, 1);
308 pam_err = pam_set_item(pamh, PAM_TTY, tty);
309 if (pam_err != PAM_SUCCESS) {
310 pam_syslog("pam_set_item(PAM_TTY)");
312 au_login_fail("PAM Error", 1);
314 bail(NO_SLEEP_EXIT, 1);
316 pam_err = pam_set_item(pamh, PAM_RHOST, hostname);
317 if (pam_err != PAM_SUCCESS) {
318 pam_syslog("pam_set_item(PAM_RHOST)");
320 au_login_fail("PAM Error", 1);
322 bail(NO_SLEEP_EXIT, 1);
325 pwd = getpwnam(username);
326 if (pwd != NULL && pwd->pw_uid == 0)
330 * If the -f option was specified and the caller is
331 * root or the caller isn't changing their uid, don't
334 if (pwd != NULL && fflag &&
335 (uid == (uid_t)0 || uid == (uid_t)pwd->pw_uid)) {
336 /* already authenticated */
339 auditsuccess = 0; /* opened a terminal window only */
343 (void)setpriority(PRIO_PROCESS, 0, -4);
345 (void)setpriority(PRIO_PROCESS, 0, 0);
348 if (pwd && rval == 0)
354 * We are not exiting here, but this corresponds to a failed
355 * login event, so set exitstatus to 1.
358 au_login_fail("Login incorrect", 1);
361 (void)printf("Login incorrect\n");
367 * Allow up to 'retry' (10) attempts, but start
368 * backing off after 'backoff' (3) attempts.
370 if (++cnt > backoff) {
371 if (cnt >= retries) {
375 sleep((u_int)((cnt - backoff) * 5));
379 /* committed to login -- turn off timeout */
380 (void)alarm((u_int)0);
382 (void)sigemptyset(&mask);
383 (void)sigaddset(&mask, SIGHUP);
384 (void)sigaddset(&mask, SIGTERM);
385 (void)sigprocmask(SIG_BLOCK, &mask, &omask);
386 sa.sa_handler = bail_sig;
387 (void)sigaction(SIGHUP, &sa, NULL);
388 (void)sigaction(SIGTERM, &sa, NULL);
393 /* Audit successful login. */
399 * This needs to happen before login_getpwclass to support
400 * home directories on GSS-API authenticated NFS where the
401 * kerberos credentials need to be saved so that the kernel
402 * can authenticate to the NFS server.
404 pam_err = pam_setcred(pamh, pam_silent|PAM_ESTABLISH_CRED);
405 if (pam_err != PAM_SUCCESS) {
406 pam_syslog("pam_setcred()");
407 bail(NO_SLEEP_EXIT, 1);
409 pam_cred_established = 1;
412 * Establish the login class.
414 lc = login_getpwclass(pwd);
415 lc_user = login_getuserclass(pwd);
417 if (!(quietlog = login_getcapbool(lc_user, "hushlogin", 0)))
418 quietlog = login_getcapbool(lc, "hushlogin", 0);
421 * Switching needed for NFS with root access disabled.
423 * XXX: This change fails to modify the additional groups for the
424 * process, and as such, may restrict rights normally granted
425 * through those groups.
427 (void)setegid(pwd->pw_gid);
428 (void)seteuid(rootlogin ? 0 : pwd->pw_uid);
429 if (!*pwd->pw_dir || chdir(pwd->pw_dir) < 0) {
430 if (login_getcapbool(lc, "requirehome", 0))
431 refused("Home directory not available", "HOMEDIR", 1);
433 refused("Cannot find root directory", "ROOTDIR", 1);
434 if (!quietlog || *pwd->pw_dir)
435 printf("No home directory.\nLogging in with home = \"/\".\n");
436 pwd->pw_dir = strdup("/");
437 if (pwd->pw_dir == NULL) {
438 syslog(LOG_NOTICE, "strdup(): %m");
445 quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0;
450 shell = login_getcapstr(lc, "shell", pwd->pw_shell, pwd->pw_shell);
451 if (*pwd->pw_shell == '\0')
452 pwd->pw_shell = strdup(_PATH_BSHELL);
453 if (pwd->pw_shell == NULL) {
454 syslog(LOG_NOTICE, "strdup(): %m");
457 if (*shell == '\0') /* Not overridden */
458 shell = pwd->pw_shell;
459 if ((shell = strdup(shell)) == NULL) {
460 syslog(LOG_NOTICE, "strdup(): %m");
465 * Set device protections, depending on what terminal the
466 * user is logged in. This feature is used on Suns to give
467 * console users better privacy.
469 login_fbtab(tty, pwd->pw_uid, pwd->pw_gid);
472 * Clear flags of the tty. None should be set, and when the
473 * user sets them otherwise, this can cause the chown to fail.
474 * Since it isn't clear that flags are useful on character
475 * devices, we just clear them.
477 * We don't log in the case of EOPNOTSUPP because dev might be
478 * on NFS, which doesn't support chflags.
480 * We don't log in the EROFS because that means that /dev is on
481 * a read only file system and we assume that the permissions there
484 if (ttyn != tname && chflags(ttyn, 0))
485 if (errno != EOPNOTSUPP && errno != EROFS)
486 syslog(LOG_ERR, "chflags(%s): %m", ttyn);
487 if (ttyn != tname && chown(ttyn, pwd->pw_uid,
488 (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid))
490 syslog(LOG_ERR, "chown(%s): %m", ttyn);
494 * Syslog each successful login, so we don't have to watch
495 * hundreds of wtmp or lastlogin files.
498 syslog(LOG_INFO, "login from %s on %s as %s",
499 hostname, tty, pwd->pw_name);
501 syslog(LOG_INFO, "login on %s as %s",
506 * If fflag is on, assume caller/authenticator has logged root
509 if (rootlogin && fflag == 0) {
511 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s",
512 username, tty, hostname);
514 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s",
519 * Destroy environment unless user has requested its
520 * preservation - but preserve TERM in all cases
522 term = getenv("TERM");
526 setenv("TERM", term, 0);
529 * PAM modules might add supplementary groups during pam_setcred().
531 if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETGROUP) != 0) {
532 syslog(LOG_ERR, "setusercontext() failed - exiting");
533 bail(NO_SLEEP_EXIT, 1);
536 pam_err = pam_setcred(pamh, pam_silent|PAM_REINITIALIZE_CRED);
537 if (pam_err != PAM_SUCCESS) {
538 pam_syslog("pam_setcred()");
539 bail(NO_SLEEP_EXIT, 1);
542 pam_err = pam_open_session(pamh, pam_silent);
543 if (pam_err != PAM_SUCCESS) {
544 pam_syslog("pam_open_session()");
545 bail(NO_SLEEP_EXIT, 1);
547 pam_session_established = 1;
550 * We must fork() before setuid() because we need to call
551 * pam_close_session() as root.
556 } else if (pid != 0) {
558 * Parent: wait for child to finish, then clean up
561 * If we get SIGHUP or SIGTERM, clean up the session
562 * and exit right away. This will make the terminal
563 * inaccessible and send SIGHUP to the foreground
567 setproctitle("-%s [pam]", getprogname());
568 (void)sigprocmask(SIG_SETMASK, &omask, NULL);
569 waitpid(pid, &status, 0);
570 (void)sigprocmask(SIG_BLOCK, &mask, NULL);
571 bail(NO_SLEEP_EXIT, 0);
575 * NOTICE: We are now in the child process!
579 * Add any environment variables the PAM modules may have set.
581 export_pam_environment();
584 * We're done with PAM now; our parent will deal with the rest.
590 * We don't need to be root anymore, so set the login name and
593 if (setlogin(username) != 0) {
594 syslog(LOG_ERR, "setlogin(%s): %m - exiting", username);
595 bail(NO_SLEEP_EXIT, 1);
597 if (setusercontext(lc, pwd, pwd->pw_uid,
598 LOGIN_SETALL & ~(LOGIN_SETLOGIN|LOGIN_SETGROUP)) != 0) {
599 syslog(LOG_ERR, "setusercontext() failed - exiting");
603 (void)setenv("SHELL", pwd->pw_shell, 1);
604 (void)setenv("HOME", pwd->pw_dir, 1);
605 /* Overwrite "term" from login.conf(5) for any known TERM */
606 if (term == NULL && (tp = stypeof(tty)) != NULL)
607 (void)setenv("TERM", tp, 1);
609 (void)setenv("TERM", TERM_UNKNOWN, 0);
610 (void)setenv("LOGNAME", username, 1);
611 (void)setenv("USER", username, 1);
612 (void)setenv("PATH", rootlogin ? _PATH_STDPATH : _PATH_DEFPATH, 0);
617 cw = login_getcapstr(lc, "welcome", NULL, NULL);
618 if (cw != NULL && access(cw, F_OK) == 0)
621 motd(_PATH_MOTDFILE);
623 if (login_getcapbool(lc_user, "nocheckmail", 0) == 0 &&
624 login_getcapbool(lc, "nocheckmail", 0) == 0) {
627 /* $MAIL may have been set by class. */
630 asprintf(&cx, "%s/%s",
631 _PATH_MAILDIR, pwd->pw_name);
633 if (cx && stat(cx, &st) == 0 && st.st_size != 0)
634 (void)printf("You have %smail.\n",
635 (st.st_mtime > st.st_atime) ? "new " : "");
636 if (getenv("MAIL") == NULL)
641 login_close(lc_user);
644 sa.sa_handler = SIG_DFL;
645 (void)sigaction(SIGALRM, &sa, NULL);
646 (void)sigaction(SIGQUIT, &sa, NULL);
647 (void)sigaction(SIGINT, &sa, NULL);
648 (void)sigaction(SIGTERM, &sa, NULL);
649 (void)sigaction(SIGHUP, &sa, NULL);
650 sa.sa_handler = SIG_IGN;
651 (void)sigaction(SIGTSTP, &sa, NULL);
652 (void)sigprocmask(SIG_SETMASK, &omask, NULL);
655 * Login shells have a leading '-' in front of argv[0]
657 p = strrchr(pwd->pw_shell, '/');
658 if (asprintf(&arg0, "-%s", p ? p + 1 : pwd->pw_shell) >= MAXPATHLEN) {
659 syslog(LOG_ERR, "user: %s: shell exceeds maximum pathname size",
661 errx(1, "shell exceeds maximum pathname size");
662 } else if (arg0 == NULL) {
663 err(1, "asprintf()");
666 execlp(shell, arg0, (char *)0);
675 * Attempt to authenticate the user using PAM. Returns 0 if the user is
676 * authenticated, or 1 if not authenticated. If some sort of PAM system
677 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this
678 * function returns -1. This can be used as an indication that we should
679 * fall back to a different authentication mechanism.
684 const char *tmpl_user;
688 pam_err = pam_authenticate(pamh, pam_silent);
693 * With PAM we support the concept of a "template"
694 * user. The user enters a login name which is
695 * authenticated by PAM, usually via a remote service
696 * such as RADIUS or TACACS+. If authentication
697 * succeeds, a different but related "template" name
698 * is used for setting the credentials, shell, and
699 * home directory. The name the user enters need only
700 * exist on the remote authentication server, but the
701 * template name must be present in the local password
704 * This is supported by two various mechanisms in the
705 * individual modules. However, from the application's
706 * point of view, the template user is always passed
707 * back as a changed value of the PAM_USER item.
709 pam_err = pam_get_item(pamh, PAM_USER, &item);
710 if (pam_err == PAM_SUCCESS) {
711 tmpl_user = (const char *)item;
712 if (strcmp(username, tmpl_user) != 0)
713 pwd = getpwnam(tmpl_user);
715 pam_syslog("pam_get_item(PAM_USER)");
721 case PAM_USER_UNKNOWN:
727 pam_syslog("pam_authenticate()");
733 pam_err = pam_acct_mgmt(pamh, pam_silent);
737 case PAM_NEW_AUTHTOK_REQD:
738 pam_err = pam_chauthtok(pamh,
739 pam_silent|PAM_CHANGE_EXPIRED_AUTHTOK);
740 if (pam_err != PAM_SUCCESS) {
741 pam_syslog("pam_chauthtok()");
746 pam_syslog("pam_acct_mgmt()");
753 pam_end(pamh, pam_err);
760 * Export any environment variables PAM modules may have set
763 export_pam_environment(void)
768 pam_env = pam_getenvlist(pamh);
769 if (pam_env != NULL) {
770 for (pp = pam_env; *pp != NULL; pp++) {
778 * Perform sanity checks on an environment variable:
779 * - Make sure there is an '=' in the string.
780 * - Make sure the string doesn't run on too long.
781 * - Do not export certain variables. This list was taken from the
782 * Solaris pam_putenv(3) man page.
786 export(const char *s)
788 static const char *noexport[] = {
789 "SHELL", "HOME", "LOGNAME", "MAIL", "CDPATH",
796 if (strlen(s) > 1024 || (p = strchr(s, '=')) == NULL)
798 if (strncmp(s, "LD_", 3) == 0)
800 for (pp = noexport; *pp != NULL; pp++) {
802 if (s[n] == '=' && strncmp(s, *pp, n) == 0)
806 (void)setenv(s, p + 1, 1);
815 (void)fprintf(stderr, "usage: login [-fp] [-h hostname] [username]\n");
820 * Prompt user and read login name from stdin.
828 nbuf = malloc(MAXLOGNAME);
832 (void)printf("%s", prompt);
833 for (p = nbuf; (ch = getchar()) != '\n'; ) {
836 bail(NO_SLEEP_EXIT, 0);
838 if (p < nbuf + MAXLOGNAME - 1)
844 if (nbuf[0] == '-') {
846 memmove(nbuf, nbuf + 1, strlen(nbuf));
848 pam_silent = PAM_SILENT;
854 * SIGINT handler for motd().
856 static volatile int motdinterrupt;
858 sigint(int signo __unused)
864 * Display the contents of a file (such as /etc/motd).
867 motd(const char *motdfile)
869 struct sigaction newint, oldint;
873 if ((f = fopen(motdfile, "r")) == NULL)
876 newint.sa_handler = sigint;
878 sigfillset(&newint.sa_mask);
879 sigaction(SIGINT, &newint, &oldint);
880 while ((ch = fgetc(f)) != EOF && !motdinterrupt)
882 sigaction(SIGINT, &oldint, NULL);
883 if (ch != EOF || ferror(f)) {
892 * SIGALRM handler, to enforce login prompt timeout.
894 * XXX This can potentially confuse the hell out of PAM. We should
895 * XXX instead implement a conversation function that returns
896 * XXX PAM_CONV_ERR when interrupted by a signal, and have the signal
897 * XXX handler just set a flag.
900 timedout(int signo __unused)
903 longjmp(timeout_buf, signo);
913 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s",
914 failures, failures > 1 ? "S" : "", hostname);
915 syslog(LOG_AUTHPRIV|LOG_NOTICE,
916 "%d LOGIN FAILURE%s FROM %s, %s",
917 failures, failures > 1 ? "S" : "", hostname, name);
919 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s",
920 failures, failures > 1 ? "S" : "", tty);
921 syslog(LOG_AUTHPRIV|LOG_NOTICE,
922 "%d LOGIN FAILURE%s ON %s, %s",
923 failures, failures > 1 ? "S" : "", tty, name);
933 if (ttyid != NULL && *ttyid != '\0') {
934 t = getttynam(ttyid);
935 if (t != NULL && t->ty_type != NULL)
942 refused(const char *msg, const char *rtype, int lout)
946 printf("%s.\n", msg);
948 syslog(LOG_NOTICE, "LOGIN %s REFUSED (%s) FROM %s ON TTY %s",
949 pwd->pw_name, rtype, hostname, tty);
951 syslog(LOG_NOTICE, "LOGIN %s REFUSED (%s) ON TTY %s",
952 pwd->pw_name, rtype, tty);
961 pam_syslog(const char *msg)
963 syslog(LOG_ERR, "%s: %s", msg, pam_strerror(pamh, pam_err));
974 if (pam_session_established) {
975 pam_err = pam_close_session(pamh, 0);
976 if (pam_err != PAM_SUCCESS)
977 pam_syslog("pam_close_session()");
979 pam_session_established = 0;
980 if (pam_cred_established) {
981 pam_err = pam_setcred(pamh, pam_silent|PAM_DELETE_CRED);
982 if (pam_err != PAM_SUCCESS)
983 pam_syslog("pam_setcred()");
985 pam_cred_established = 0;
986 pam_end(pamh, pam_err);
992 bail_internal(int sec, int eval, int signo)
1005 sa.sa_handler = SIG_DFL;
1007 (void)sigemptyset(&sa.sa_mask);
1008 (void)sigaction(signo, &sa, NULL);
1009 (void)sigaddset(&sa.sa_mask, signo);
1010 (void)sigprocmask(SIG_UNBLOCK, &sa.sa_mask, NULL);
1017 * Exit, optionally after sleeping a few seconds
1020 bail(int sec, int eval)
1022 bail_internal(sec, eval, 0);
1026 * Exit because of a signal.
1027 * This is not async-signal safe, so only call async-signal safe functions
1028 * while the signal is unmasked.
1033 bail_internal(NO_SLEEP_EXIT, 0, signo);