2 * Copyright Elliot Lee, 1996. All rights reserved.
3 * Copyright Jan Rêkorajski, 1999. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, and the entire permission notice in its entirety,
10 * including the disclaimer of warranties.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote
15 * products derived from this software without specific prior
18 * ALTERNATIVELY, this product may be distributed under the terms of
19 * the GNU Public License, in which case the provisions of the GPL are
20 * required INSTEAD OF the above restrictions. (This clause is
21 * necessary due to a potential bad interaction between the GPL and
22 * the restrictions contained in a BSD-style copyright.)
24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
28 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
29 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
30 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
32 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
34 * OF THE POSSIBILITY OF SUCH DAMAGE.
43 #include <sys/types.h>
47 #include <time.h> /* for time() */
51 #include <selinux/selinux.h>
52 #define SELINUX_ENABLED is_selinux_enabled()>0
55 #include <security/_pam_macros.h>
57 /* indicate that the following groups are defined */
59 #define PAM_SM_ACCOUNT
61 #include <security/pam_modules.h>
62 #include <security/pam_ext.h>
63 #include <security/pam_modutil.h>
71 struct spwd *_unix_run_verify_binary(pam_handle_t *pamh, unsigned int ctrl, const char *user)
73 int retval=0, child, fds[2];
74 void (*sighandler)(int) = NULL;
75 D(("running verify_binary"));
77 /* create a pipe for the messages */
79 D(("could not make pipe"));
80 pam_syslog(pamh, LOG_ERR, "Could not make pipe: %m");
85 if (off(UNIX_NOREAP, ctrl)) {
87 * This code arranges that the demise of the child does not cause
88 * the application to receive a signal it is not expecting - which
89 * may kill the application or worse.
91 * The "noreap" module argument is provided so that the admin can
92 * override this behavior.
94 sighandler = signal(SIGCHLD, SIG_DFL);
102 static char *envp[] = { NULL };
103 char *args[] = { NULL, NULL, NULL, NULL };
106 /* reopen stdin as pipe */
108 dup2(fds[1], STDOUT_FILENO);
110 /* XXX - should really tidy up PAM here too */
112 if (getrlimit(RLIMIT_NOFILE,&rlim)==0) {
113 for (i=2; i < rlim.rlim_max; i++) {
114 if ((unsigned int)fds[1] != i) {
120 if (SELINUX_ENABLED && geteuid() == 0) {
121 /* must set the real uid to 0 so the helper will not error
122 out if pam is called from setuid binary (su, sudo...) */
126 /* exec binary helper */
127 args[0] = x_strdup(CHKPWD_HELPER);
128 args[1] = x_strdup(user);
129 args[2] = x_strdup("verify");
131 execve(CHKPWD_HELPER, args, envp);
133 pam_syslog(pamh, LOG_ERR, "helper binary execve failed: %m");
134 /* should not get here: exit with error */
136 D(("helper binary is not available"));
137 exit(PAM_AUTHINFO_UNAVAIL);
143 rc=waitpid(child, &retval, 0); /* wait for helper to complete */
145 pam_syslog(pamh, LOG_ERR, "unix_chkpwd waitpid returned %d: %m", rc);
146 retval = PAM_AUTH_ERR;
148 retval = WEXITSTATUS(retval);
149 if (retval != PAM_AUTHINFO_UNAVAIL) {
150 rc = pam_modutil_read(fds[0], buf, sizeof(buf) - 1);
153 if (sscanf(buf,"%ld:%ld:%ld:%ld:%ld:%ld",
154 &spwd.sp_lstchg, /* last password change */
155 &spwd.sp_min, /* days until change allowed. */
156 &spwd.sp_max, /* days before change required */
157 &spwd.sp_warn, /* days warning for expiration */
158 &spwd.sp_inact, /* days before account inactive */
159 &spwd.sp_expire) /* date when account expires */ != 6 ) retval = PAM_AUTH_ERR;
162 pam_syslog(pamh, LOG_ERR, " ERROR %d: %m", rc); retval = PAM_AUTH_ERR;
167 pam_syslog(pamh, LOG_ERR, "Fork failed: %m");
169 retval = PAM_AUTH_ERR;
173 if (sighandler != NULL) {
174 (void) signal(SIGCHLD, sighandler); /* restore old signal handler */
176 D(("Returning %d",retval));
177 if (retval != PAM_SUCCESS) {
187 * PAM framework looks for this entry-point to pass control to the
188 * account management module.
191 PAM_EXTERN int pam_sm_acct_mgmt(pam_handle_t * pamh, int flags,
192 int argc, const char **argv)
195 const void *void_uname;
197 int retval, daysleft;
200 struct passwd *pwent;
205 ctrl = _set_ctrl(pamh, flags, NULL, argc, argv);
207 retval = pam_get_item(pamh, PAM_USER, &void_uname);
209 D(("user = `%s'", uname));
210 if (retval != PAM_SUCCESS || uname == NULL) {
211 pam_syslog(pamh, LOG_ALERT,
212 "could not identify user (from uid=%d)",
214 return PAM_USER_UNKNOWN;
217 pwent = pam_modutil_getpwnam(pamh, uname);
219 pam_syslog(pamh, LOG_ALERT,
220 "could not identify user (from getpwnam(%s))",
222 return PAM_USER_UNKNOWN;
225 if (!strcmp( pwent->pw_passwd, "*NP*" )) { /* NIS+ */
226 uid_t save_euid, save_uid;
228 save_euid = geteuid();
230 if (save_uid == pwent->pw_uid)
231 setreuid( save_euid, save_uid );
234 if (setreuid( -1, pwent->pw_uid ) == -1) {
237 if(setreuid( -1, pwent->pw_uid ) == -1)
238 return PAM_CRED_INSUFFICIENT;
241 spent = pam_modutil_getspnam (pamh, uname);
242 if (save_uid == pwent->pw_uid)
243 setreuid( save_uid, save_euid );
245 if (setreuid( -1, 0 ) == -1)
246 setreuid( save_uid, -1 );
247 setreuid( -1, save_euid );
250 } else if (_unix_shadowed (pwent))
251 spent = pam_modutil_getspnam (pamh, uname);
256 if (!spent && SELINUX_ENABLED )
257 spent = _unix_run_verify_binary(pamh, ctrl, uname);
261 if (on(UNIX_BROKEN_SHADOW,ctrl))
265 return PAM_AUTHINFO_UNAVAIL; /* Couldn't get username from shadow */
267 curdays = time(NULL) / (60 * 60 * 24);
268 D(("today is %d, last change %d", curdays, spent->sp_lstchg));
269 if ((curdays > spent->sp_expire) && (spent->sp_expire != -1)) {
270 pam_syslog(pamh, LOG_NOTICE,
271 "account %s has expired (account expired)",
273 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
274 _("Your account has expired; please contact your system administrator"));
275 D(("account expired"));
276 return PAM_ACCT_EXPIRED;
278 if (spent->sp_lstchg == 0) {
279 pam_syslog(pamh, LOG_NOTICE,
280 "expired password for user %s (root enforced)",
282 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
283 _("You are required to change your password immediately (root enforced)"));
284 D(("need a new password"));
285 return PAM_NEW_AUTHTOK_REQD;
287 if (curdays < spent->sp_lstchg) {
288 pam_syslog(pamh, LOG_DEBUG,
289 "account %s has password changed in future",
293 if ((curdays - spent->sp_lstchg > spent->sp_max)
294 && (curdays - spent->sp_lstchg > spent->sp_inact)
295 && (curdays - spent->sp_lstchg > spent->sp_max + spent->sp_inact)
296 && (spent->sp_max != -1) && (spent->sp_inact != -1)) {
297 pam_syslog(pamh, LOG_NOTICE,
298 "account %s has expired (failed to change password)",
300 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
301 _("Your account has expired; please contact your system administrator"));
302 D(("account expired 2"));
303 return PAM_ACCT_EXPIRED;
305 if ((curdays - spent->sp_lstchg > spent->sp_max) && (spent->sp_max != -1)) {
306 pam_syslog(pamh, LOG_DEBUG,
307 "expired password for user %s (password aged)",
309 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
310 _("You are required to change your password immediately (password aged)"));
311 D(("need a new password 2"));
312 return PAM_NEW_AUTHTOK_REQD;
314 if ((curdays - spent->sp_lstchg > spent->sp_max - spent->sp_warn)
315 && (spent->sp_max != -1) && (spent->sp_warn != -1)) {
316 daysleft = (spent->sp_lstchg + spent->sp_max) - curdays;
317 pam_syslog(pamh, LOG_DEBUG,
318 "password for user %s will expire in %d days",
320 snprintf(buf, sizeof (buf), _("Warning: your password will expire in %d day%.2s"),
321 daysleft, daysleft == 1 ? "" : "s");
322 _make_remark(pamh, ctrl, PAM_TEXT_INFO, buf);
331 /* static module data */
333 struct pam_module _pam_unix_acct_modstruct = {