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>
66 #include <login_cap.h>
77 #include <security/pam_appl.h>
78 #include <security/openpam.h>
81 #include "pathnames.h"
83 static int auth_pam(void);
84 static void bail(int, int);
85 static void bail_internal(int, int, int);
86 static int export(const char *);
87 static void export_pam_environment(void);
88 static int motd(const char *);
89 static void badlogin(char *);
90 static char *getloginname(void);
91 static void pam_syslog(const char *);
92 static void pam_cleanup(void);
93 static void refused(const char *, const char *, int);
94 static const char *stypeof(char *);
95 static void sigint(int);
96 static void timedout(int);
97 static void bail_sig(int);
98 static void usage(void);
100 #define TTYGRPNAME "tty" /* group to own ttys */
101 #define DEFAULT_BACKOFF 3
102 #define DEFAULT_RETRIES 10
103 #define DEFAULT_PROMPT "login: "
104 #define DEFAULT_PASSWD_PROMPT "Password:"
105 #define TERM_UNKNOWN "su"
106 #define DEFAULT_WARN (2L * 7L * 86400L) /* Two weeks */
107 #define NO_SLEEP_EXIT 0
111 * This bounds the time given to login. Not a define so it can
112 * be patched on machines where it's too small.
114 static u_int timeout = 300;
116 /* Buffer for signal handling of timeout */
117 static jmp_buf timeout_buf;
122 static char *envinit[1]; /* empty environment list */
125 * Command line flags and arguments
127 static int fflag; /* -f: do not perform authentication */
128 static int hflag; /* -h: login from remote host */
129 static char *hostname; /* hostname from command line */
130 static int pflag; /* -p: preserve environment */
135 static char *username; /* user name */
136 static char *olduser; /* previous user name */
141 static char default_prompt[] = DEFAULT_PROMPT;
142 static const char *prompt;
143 static char default_passwd_prompt[] = DEFAULT_PASSWD_PROMPT;
144 static const char *passwd_prompt;
151 static pam_handle_t *pamh = NULL;
152 static struct pam_conv pamc = { openpam_ttyconv, NULL };
154 static int pam_silent = PAM_SILENT;
155 static int pam_cred_established;
156 static int pam_session_established;
159 main(int argc, char *argv[])
163 int retries, backoff;
164 int ask, ch, cnt, quietlog, rootlogin, rval;
169 char tname[sizeof(_PATH_TTY) + 10];
172 const char *shell = NULL;
173 login_cap_t *lc = NULL;
174 login_cap_t *lc_user = NULL;
176 sigset_t mask, omask;
179 char auditsuccess = 1;
182 sa.sa_flags = SA_RESTART;
183 (void)sigfillset(&sa.sa_mask);
184 sa.sa_handler = SIG_IGN;
185 (void)sigaction(SIGQUIT, &sa, NULL);
186 (void)sigaction(SIGINT, &sa, NULL);
187 (void)sigaction(SIGHUP, &sa, NULL);
188 if (setjmp(timeout_buf)) {
191 (void)fprintf(stderr, "Login timed out after %d seconds\n",
193 bail(NO_SLEEP_EXIT, 0);
195 sa.sa_handler = timedout;
196 (void)sigaction(SIGALRM, &sa, NULL);
197 (void)alarm(timeout);
198 (void)setpriority(PRIO_PROCESS, 0, 0);
200 openlog("login", 0, LOG_AUTH);
206 while ((ch = getopt(argc, argv, "fh:p")) != -1)
213 errx(1, "-h option: %s", strerror(EPERM));
214 if (strlen(optarg) >= MAXHOSTNAMELEN)
215 errx(1, "-h option: %s: exceeds maximum "
216 "hostname size", optarg);
226 syslog(LOG_ERR, "invalid flag %c", ch);
233 username = strdup(*argv);
234 if (username == NULL)
241 setproctitle("-%s", getprogname());
248 ttyn = ttyname(STDIN_FILENO);
249 if (ttyn == NULL || *ttyn == '\0') {
250 (void)snprintf(tname, sizeof(tname), "%s??", _PATH_TTY);
253 if (strncmp(ttyn, _PATH_DEV, sizeof _PATH_DEV - 1) == 0)
254 tty = ttyn + sizeof _PATH_DEV - 1;
259 * Get "login-retries" & "login-backoff" from default class
261 lc = login_getclass(NULL);
262 prompt = login_getcapstr(lc, "login_prompt",
263 default_prompt, default_prompt);
264 passwd_prompt = login_getcapstr(lc, "passwd_prompt",
265 default_passwd_prompt, default_passwd_prompt);
266 retries = login_getcapnum(lc, "login-retries",
267 DEFAULT_RETRIES, DEFAULT_RETRIES);
268 backoff = login_getcapnum(lc, "login-backoff",
269 DEFAULT_BACKOFF, DEFAULT_BACKOFF);
274 * Try to authenticate the user until we succeed or time out.
276 for (cnt = 0;; ask = 1) {
282 username = getloginname();
287 * Note if trying multiple user names; log failures for
288 * previous user name, but don't bother logging one failure
289 * for nonexistent name (mistyped username).
291 if (failures && strcmp(olduser, username) != 0) {
292 if (failures > (pwd ? 0 : 1))
297 * Load the PAM policy and set some variables
299 pam_err = pam_start("login", username, &pamc, &pamh);
300 if (pam_err != PAM_SUCCESS) {
301 pam_syslog("pam_start()");
303 au_login_fail("PAM Error", 1);
305 bail(NO_SLEEP_EXIT, 1);
307 pam_err = pam_set_item(pamh, PAM_TTY, tty);
308 if (pam_err != PAM_SUCCESS) {
309 pam_syslog("pam_set_item(PAM_TTY)");
311 au_login_fail("PAM Error", 1);
313 bail(NO_SLEEP_EXIT, 1);
315 pam_err = pam_set_item(pamh, PAM_RHOST, hostname);
316 if (pam_err != PAM_SUCCESS) {
317 pam_syslog("pam_set_item(PAM_RHOST)");
319 au_login_fail("PAM Error", 1);
321 bail(NO_SLEEP_EXIT, 1);
324 pwd = getpwnam(username);
325 if (pwd != NULL && pwd->pw_uid == 0)
329 * If the -f option was specified and the caller is
330 * root or the caller isn't changing their uid, don't
333 if (pwd != NULL && fflag &&
334 (uid == (uid_t)0 || uid == (uid_t)pwd->pw_uid)) {
335 /* already authenticated */
338 auditsuccess = 0; /* opened a terminal window only */
342 (void)setpriority(PRIO_PROCESS, 0, -4);
344 (void)setpriority(PRIO_PROCESS, 0, 0);
347 if (pwd && rval == 0)
353 * We are not exiting here, but this corresponds to a failed
354 * login event, so set exitstatus to 1.
357 au_login_fail("Login incorrect", 1);
360 (void)printf("Login incorrect\n");
366 * Allow up to 'retry' (10) attempts, but start
367 * backing off after 'backoff' (3) attempts.
369 if (++cnt > backoff) {
370 if (cnt >= retries) {
374 sleep((u_int)((cnt - backoff) * 5));
378 /* committed to login -- turn off timeout */
379 (void)alarm((u_int)0);
381 (void)sigemptyset(&mask);
382 (void)sigaddset(&mask, SIGHUP);
383 (void)sigaddset(&mask, SIGTERM);
384 (void)sigprocmask(SIG_BLOCK, &mask, &omask);
385 sa.sa_handler = bail_sig;
386 (void)sigaction(SIGHUP, &sa, NULL);
387 (void)sigaction(SIGTERM, &sa, NULL);
392 /* Audit successful login. */
398 * This needs to happen before login_getpwclass to support
399 * home directories on GSS-API authenticated NFS where the
400 * kerberos credentials need to be saved so that the kernel
401 * can authenticate to the NFS server.
403 pam_err = pam_setcred(pamh, pam_silent|PAM_ESTABLISH_CRED);
404 if (pam_err != PAM_SUCCESS) {
405 pam_syslog("pam_setcred()");
406 bail(NO_SLEEP_EXIT, 1);
408 pam_cred_established = 1;
411 * Establish the login class.
413 lc = login_getpwclass(pwd);
414 lc_user = login_getuserclass(pwd);
416 if (!(quietlog = login_getcapbool(lc_user, "hushlogin", 0)))
417 quietlog = login_getcapbool(lc, "hushlogin", 0);
420 * Switching needed for NFS with root access disabled.
422 * XXX: This change fails to modify the additional groups for the
423 * process, and as such, may restrict rights normally granted
424 * through those groups.
426 (void)setegid(pwd->pw_gid);
427 (void)seteuid(rootlogin ? 0 : pwd->pw_uid);
428 if (!*pwd->pw_dir || chdir(pwd->pw_dir) < 0) {
429 if (login_getcapbool(lc, "requirehome", 0))
430 refused("Home directory not available", "HOMEDIR", 1);
432 refused("Cannot find root directory", "ROOTDIR", 1);
433 if (!quietlog || *pwd->pw_dir)
434 printf("No home directory.\nLogging in with home = \"/\".\n");
435 pwd->pw_dir = strdup("/");
436 if (pwd->pw_dir == NULL) {
437 syslog(LOG_NOTICE, "strdup(): %m");
444 quietlog = access(_PATH_HUSHLOGIN, F_OK) == 0;
449 shell = login_getcapstr(lc, "shell", pwd->pw_shell, pwd->pw_shell);
450 if (*pwd->pw_shell == '\0')
451 pwd->pw_shell = strdup(_PATH_BSHELL);
452 if (pwd->pw_shell == NULL) {
453 syslog(LOG_NOTICE, "strdup(): %m");
456 if (*shell == '\0') /* Not overridden */
457 shell = pwd->pw_shell;
458 if ((shell = strdup(shell)) == NULL) {
459 syslog(LOG_NOTICE, "strdup(): %m");
464 * Set device protections, depending on what terminal the
465 * user is logged in. This feature is used on Suns to give
466 * console users better privacy.
468 login_fbtab(tty, pwd->pw_uid, pwd->pw_gid);
471 * Clear flags of the tty. None should be set, and when the
472 * user sets them otherwise, this can cause the chown to fail.
473 * Since it isn't clear that flags are useful on character
474 * devices, we just clear them.
476 * We don't log in the case of EOPNOTSUPP because dev might be
477 * on NFS, which doesn't support chflags.
479 * We don't log in the EROFS because that means that /dev is on
480 * a read only file system and we assume that the permissions there
483 if (ttyn != tname && chflags(ttyn, 0))
484 if (errno != EOPNOTSUPP && errno != EROFS)
485 syslog(LOG_ERR, "chflags(%s): %m", ttyn);
486 if (ttyn != tname && chown(ttyn, pwd->pw_uid,
487 (gr = getgrnam(TTYGRPNAME)) ? gr->gr_gid : pwd->pw_gid))
489 syslog(LOG_ERR, "chown(%s): %m", ttyn);
493 * Syslog each successful login, so we don't have to watch
494 * hundreds of wtmp or lastlogin files.
497 syslog(LOG_INFO, "login from %s on %s as %s",
498 hostname, tty, pwd->pw_name);
500 syslog(LOG_INFO, "login on %s as %s",
505 * If fflag is on, assume caller/authenticator has logged root
508 if (rootlogin && fflag == 0) {
510 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s FROM %s",
511 username, tty, hostname);
513 syslog(LOG_NOTICE, "ROOT LOGIN (%s) ON %s",
518 * Destroy environment unless user has requested its
519 * preservation - but preserve TERM in all cases
521 term = getenv("TERM");
525 setenv("TERM", term, 0);
528 * PAM modules might add supplementary groups during pam_setcred().
530 if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETGROUP) != 0) {
531 syslog(LOG_ERR, "setusercontext() failed - exiting");
532 bail(NO_SLEEP_EXIT, 1);
535 pam_err = pam_setcred(pamh, pam_silent|PAM_REINITIALIZE_CRED);
536 if (pam_err != PAM_SUCCESS) {
537 pam_syslog("pam_setcred()");
538 bail(NO_SLEEP_EXIT, 1);
541 pam_err = pam_open_session(pamh, pam_silent);
542 if (pam_err != PAM_SUCCESS) {
543 pam_syslog("pam_open_session()");
544 bail(NO_SLEEP_EXIT, 1);
546 pam_session_established = 1;
549 * We must fork() before setuid() because we need to call
550 * pam_close_session() as root.
555 } else if (pid != 0) {
557 * Parent: wait for child to finish, then clean up
560 * If we get SIGHUP or SIGTERM, clean up the session
561 * and exit right away. This will make the terminal
562 * inaccessible and send SIGHUP to the foreground
566 setproctitle("-%s [pam]", getprogname());
567 (void)sigprocmask(SIG_SETMASK, &omask, NULL);
568 waitpid(pid, &status, 0);
569 (void)sigprocmask(SIG_BLOCK, &mask, NULL);
570 bail(NO_SLEEP_EXIT, 0);
574 * NOTICE: We are now in the child process!
578 * Add any environment variables the PAM modules may have set.
580 export_pam_environment();
583 * We're done with PAM now; our parent will deal with the rest.
589 * We don't need to be root anymore, so set the login name and
592 if (setlogin(username) != 0) {
593 syslog(LOG_ERR, "setlogin(%s): %m - exiting", username);
594 bail(NO_SLEEP_EXIT, 1);
596 if (setusercontext(lc, pwd, pwd->pw_uid,
597 LOGIN_SETALL & ~(LOGIN_SETLOGIN|LOGIN_SETGROUP)) != 0) {
598 syslog(LOG_ERR, "setusercontext() failed - exiting");
602 (void)setenv("SHELL", pwd->pw_shell, 1);
603 (void)setenv("HOME", pwd->pw_dir, 1);
604 /* Overwrite "term" from login.conf(5) for any known TERM */
605 if (term == NULL && (tp = stypeof(tty)) != NULL)
606 (void)setenv("TERM", tp, 1);
608 (void)setenv("TERM", TERM_UNKNOWN, 0);
609 (void)setenv("LOGNAME", username, 1);
610 (void)setenv("USER", username, 1);
611 (void)setenv("PATH", rootlogin ? _PATH_STDPATH : _PATH_DEFPATH, 0);
616 cw = login_getcapstr(lc, "welcome", NULL, NULL);
617 if (cw != NULL && access(cw, F_OK) == 0)
620 motd(_PATH_MOTDFILE);
622 if (login_getcapbool(lc_user, "nocheckmail", 0) == 0 &&
623 login_getcapbool(lc, "nocheckmail", 0) == 0) {
626 /* $MAIL may have been set by class. */
629 asprintf(&cx, "%s/%s",
630 _PATH_MAILDIR, pwd->pw_name);
632 if (cx && stat(cx, &st) == 0 && st.st_size != 0)
633 (void)printf("You have %smail.\n",
634 (st.st_mtime > st.st_atime) ? "new " : "");
635 if (getenv("MAIL") == NULL)
640 login_close(lc_user);
643 sa.sa_handler = SIG_DFL;
644 (void)sigaction(SIGALRM, &sa, NULL);
645 (void)sigaction(SIGQUIT, &sa, NULL);
646 (void)sigaction(SIGINT, &sa, NULL);
647 (void)sigaction(SIGTERM, &sa, NULL);
648 (void)sigaction(SIGHUP, &sa, NULL);
649 sa.sa_handler = SIG_IGN;
650 (void)sigaction(SIGTSTP, &sa, NULL);
651 (void)sigprocmask(SIG_SETMASK, &omask, NULL);
654 * Login shells have a leading '-' in front of argv[0]
656 p = strrchr(pwd->pw_shell, '/');
657 if (asprintf(&arg0, "-%s", p ? p + 1 : pwd->pw_shell) >= MAXPATHLEN) {
658 syslog(LOG_ERR, "user: %s: shell exceeds maximum pathname size",
660 errx(1, "shell exceeds maximum pathname size");
661 } else if (arg0 == NULL) {
662 err(1, "asprintf()");
665 execlp(shell, arg0, (char *)0);
674 * Attempt to authenticate the user using PAM. Returns 0 if the user is
675 * authenticated, or 1 if not authenticated. If some sort of PAM system
676 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this
677 * function returns -1. This can be used as an indication that we should
678 * fall back to a different authentication mechanism.
683 const char *tmpl_user;
687 pam_err = pam_authenticate(pamh, pam_silent);
692 * With PAM we support the concept of a "template"
693 * user. The user enters a login name which is
694 * authenticated by PAM, usually via a remote service
695 * such as RADIUS or TACACS+. If authentication
696 * succeeds, a different but related "template" name
697 * is used for setting the credentials, shell, and
698 * home directory. The name the user enters need only
699 * exist on the remote authentication server, but the
700 * template name must be present in the local password
703 * This is supported by two various mechanisms in the
704 * individual modules. However, from the application's
705 * point of view, the template user is always passed
706 * back as a changed value of the PAM_USER item.
708 pam_err = pam_get_item(pamh, PAM_USER, &item);
709 if (pam_err == PAM_SUCCESS) {
710 tmpl_user = (const char *)item;
711 if (strcmp(username, tmpl_user) != 0)
712 pwd = getpwnam(tmpl_user);
714 pam_syslog("pam_get_item(PAM_USER)");
720 case PAM_USER_UNKNOWN:
726 pam_syslog("pam_authenticate()");
732 pam_err = pam_acct_mgmt(pamh, pam_silent);
736 case PAM_NEW_AUTHTOK_REQD:
737 pam_err = pam_chauthtok(pamh,
738 pam_silent|PAM_CHANGE_EXPIRED_AUTHTOK);
739 if (pam_err != PAM_SUCCESS) {
740 pam_syslog("pam_chauthtok()");
745 pam_syslog("pam_acct_mgmt()");
752 pam_end(pamh, pam_err);
759 * Export any environment variables PAM modules may have set
762 export_pam_environment(void)
767 pam_env = pam_getenvlist(pamh);
768 if (pam_env != NULL) {
769 for (pp = pam_env; *pp != NULL; pp++) {
777 * Perform sanity checks on an environment variable:
778 * - Make sure there is an '=' in the string.
779 * - Make sure the string doesn't run on too long.
780 * - Do not export certain variables. This list was taken from the
781 * Solaris pam_putenv(3) man page.
785 export(const char *s)
787 static const char *noexport[] = {
788 "SHELL", "HOME", "LOGNAME", "MAIL", "CDPATH",
795 if (strlen(s) > 1024 || (p = strchr(s, '=')) == NULL)
797 if (strncmp(s, "LD_", 3) == 0)
799 for (pp = noexport; *pp != NULL; pp++) {
801 if (s[n] == '=' && strncmp(s, *pp, n) == 0)
805 (void)setenv(s, p + 1, 1);
814 (void)fprintf(stderr, "usage: login [-fp] [-h hostname] [username]\n");
819 * Prompt user and read login name from stdin.
827 nbuf = malloc(MAXLOGNAME);
831 (void)printf("%s", prompt);
832 for (p = nbuf; (ch = getchar()) != '\n'; ) {
835 bail(NO_SLEEP_EXIT, 0);
837 if (p < nbuf + MAXLOGNAME - 1)
843 if (nbuf[0] == '-') {
845 memmove(nbuf, nbuf + 1, strlen(nbuf));
847 pam_silent = PAM_SILENT;
853 * SIGINT handler for motd().
855 static volatile int motdinterrupt;
857 sigint(int signo __unused)
863 * Display the contents of a file (such as /etc/motd).
866 motd(const char *motdfile)
868 struct sigaction newint, oldint;
872 if ((f = fopen(motdfile, "r")) == NULL)
875 newint.sa_handler = sigint;
877 sigfillset(&newint.sa_mask);
878 sigaction(SIGINT, &newint, &oldint);
879 while ((ch = fgetc(f)) != EOF && !motdinterrupt)
881 sigaction(SIGINT, &oldint, NULL);
882 if (ch != EOF || ferror(f)) {
891 * SIGALRM handler, to enforce login prompt timeout.
893 * XXX This can potentially confuse the hell out of PAM. We should
894 * XXX instead implement a conversation function that returns
895 * XXX PAM_CONV_ERR when interrupted by a signal, and have the signal
896 * XXX handler just set a flag.
899 timedout(int signo __unused)
902 longjmp(timeout_buf, signo);
912 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s FROM %s",
913 failures, failures > 1 ? "S" : "", hostname);
914 syslog(LOG_AUTHPRIV|LOG_NOTICE,
915 "%d LOGIN FAILURE%s FROM %s, %s",
916 failures, failures > 1 ? "S" : "", hostname, name);
918 syslog(LOG_NOTICE, "%d LOGIN FAILURE%s ON %s",
919 failures, failures > 1 ? "S" : "", tty);
920 syslog(LOG_AUTHPRIV|LOG_NOTICE,
921 "%d LOGIN FAILURE%s ON %s, %s",
922 failures, failures > 1 ? "S" : "", tty, name);
932 if (ttyid != NULL && *ttyid != '\0') {
933 t = getttynam(ttyid);
934 if (t != NULL && t->ty_type != NULL)
941 refused(const char *msg, const char *rtype, int lout)
945 printf("%s.\n", msg);
947 syslog(LOG_NOTICE, "LOGIN %s REFUSED (%s) FROM %s ON TTY %s",
948 pwd->pw_name, rtype, hostname, tty);
950 syslog(LOG_NOTICE, "LOGIN %s REFUSED (%s) ON TTY %s",
951 pwd->pw_name, rtype, tty);
960 pam_syslog(const char *msg)
962 syslog(LOG_ERR, "%s: %s", msg, pam_strerror(pamh, pam_err));
973 if (pam_session_established) {
974 pam_err = pam_close_session(pamh, 0);
975 if (pam_err != PAM_SUCCESS)
976 pam_syslog("pam_close_session()");
978 pam_session_established = 0;
979 if (pam_cred_established) {
980 pam_err = pam_setcred(pamh, pam_silent|PAM_DELETE_CRED);
981 if (pam_err != PAM_SUCCESS)
982 pam_syslog("pam_setcred()");
984 pam_cred_established = 0;
985 pam_end(pamh, pam_err);
991 bail_internal(int sec, int eval, int signo)
1004 sa.sa_handler = SIG_DFL;
1006 (void)sigemptyset(&sa.sa_mask);
1007 (void)sigaction(signo, &sa, NULL);
1008 (void)sigaddset(&sa.sa_mask, signo);
1009 (void)sigprocmask(SIG_UNBLOCK, &sa.sa_mask, NULL);
1016 * Exit, optionally after sleeping a few seconds
1019 bail(int sec, int eval)
1021 bail_internal(sec, eval, 0);
1025 * Exit because of a signal.
1026 * This is not async-signal safe, so only call async-signal safe functions
1027 * while the signal is unmasked.
1032 bail_internal(NO_SLEEP_EXIT, 0, signo);