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>
66 #include "passverify.h"
72 struct spwd *_unix_run_verify_binary(pam_handle_t *pamh, unsigned int ctrl, const char *user)
74 int retval=0, child, fds[2];
75 void (*sighandler)(int) = NULL;
76 D(("running verify_binary"));
78 /* create a pipe for the messages */
80 D(("could not make pipe"));
81 pam_syslog(pamh, LOG_ERR, "Could not make pipe: %m");
86 if (off(UNIX_NOREAP, ctrl)) {
88 * This code arranges that the demise of the child does not cause
89 * the application to receive a signal it is not expecting - which
90 * may kill the application or worse.
92 * The "noreap" module argument is provided so that the admin can
93 * override this behavior.
95 sighandler = signal(SIGCHLD, SIG_DFL);
103 static char *envp[] = { NULL };
104 char *args[] = { NULL, NULL, NULL, NULL };
107 /* reopen stdin as pipe */
109 dup2(fds[1], STDOUT_FILENO);
111 /* XXX - should really tidy up PAM here too */
113 if (getrlimit(RLIMIT_NOFILE,&rlim)==0) {
114 for (i=2; i < rlim.rlim_max; i++) {
115 if ((unsigned int)fds[1] != i) {
121 if (SELINUX_ENABLED && geteuid() == 0) {
122 /* must set the real uid to 0 so the helper will not error
123 out if pam is called from setuid binary (su, sudo...) */
127 /* exec binary helper */
128 args[0] = x_strdup(CHKPWD_HELPER);
129 args[1] = x_strdup(user);
130 args[2] = x_strdup("verify");
132 execve(CHKPWD_HELPER, args, envp);
134 pam_syslog(pamh, LOG_ERR, "helper binary execve failed: %m");
135 /* should not get here: exit with error */
137 D(("helper binary is not available"));
138 exit(PAM_AUTHINFO_UNAVAIL);
144 rc=waitpid(child, &retval, 0); /* wait for helper to complete */
146 pam_syslog(pamh, LOG_ERR, "unix_chkpwd waitpid returned %d: %m", rc);
147 retval = PAM_AUTH_ERR;
149 retval = WEXITSTATUS(retval);
150 if (retval != PAM_AUTHINFO_UNAVAIL) {
151 rc = pam_modutil_read(fds[0], buf, sizeof(buf) - 1);
154 if (sscanf(buf,"%ld:%ld:%ld:%ld:%ld:%ld",
155 &spwd.sp_lstchg, /* last password change */
156 &spwd.sp_min, /* days until change allowed. */
157 &spwd.sp_max, /* days before change required */
158 &spwd.sp_warn, /* days warning for expiration */
159 &spwd.sp_inact, /* days before account inactive */
160 &spwd.sp_expire) /* date when account expires */ != 6 ) retval = PAM_AUTH_ERR;
163 pam_syslog(pamh, LOG_ERR, " ERROR %d: %m", rc); retval = PAM_AUTH_ERR;
168 pam_syslog(pamh, LOG_ERR, "Fork failed: %m");
170 retval = PAM_AUTH_ERR;
174 if (sighandler != SIG_ERR) {
175 (void) signal(SIGCHLD, sighandler); /* restore old signal handler */
177 D(("Returning %d",retval));
178 if (retval != PAM_SUCCESS) {
188 * PAM framework looks for this entry-point to pass control to the
189 * account management module.
192 PAM_EXTERN int pam_sm_acct_mgmt(pam_handle_t * pamh, int flags,
193 int argc, const char **argv)
196 const void *void_uname;
198 int retval, daysleft;
201 struct passwd *pwent;
206 ctrl = _set_ctrl(pamh, flags, NULL, argc, argv);
208 retval = pam_get_item(pamh, PAM_USER, &void_uname);
210 D(("user = `%s'", uname));
211 if (retval != PAM_SUCCESS || uname == NULL) {
212 pam_syslog(pamh, LOG_ALERT,
213 "could not identify user (from uid=%lu)",
214 (unsigned long int)getuid());
215 return PAM_USER_UNKNOWN;
218 pwent = pam_modutil_getpwnam(pamh, uname);
220 pam_syslog(pamh, LOG_ALERT,
221 "could not identify user (from getpwnam(%s))",
223 return PAM_USER_UNKNOWN;
226 if (!strcmp( pwent->pw_passwd, "*NP*" )) { /* NIS+ */
227 uid_t save_euid, save_uid;
229 save_euid = geteuid();
231 if (save_uid == pwent->pw_uid)
232 setreuid( save_euid, save_uid );
235 if (setreuid( -1, pwent->pw_uid ) == -1) {
238 if(setreuid( -1, pwent->pw_uid ) == -1)
239 return PAM_CRED_INSUFFICIENT;
242 spent = pam_modutil_getspnam (pamh, uname);
243 if (save_uid == pwent->pw_uid)
244 setreuid( save_uid, save_euid );
246 if (setreuid( -1, 0 ) == -1)
247 setreuid( save_uid, -1 );
248 setreuid( -1, save_euid );
251 } else if (_unix_shadowed (pwent))
252 spent = pam_modutil_getspnam (pamh, uname);
257 if (!spent && SELINUX_ENABLED )
258 spent = _unix_run_verify_binary(pamh, ctrl, uname);
262 if (on(UNIX_BROKEN_SHADOW,ctrl))
266 return PAM_AUTHINFO_UNAVAIL; /* Couldn't get username from shadow */
268 curdays = time(NULL) / (60 * 60 * 24);
269 D(("today is %d, last change %d", curdays, spent->sp_lstchg));
270 if ((curdays > spent->sp_expire) && (spent->sp_expire != -1)) {
271 pam_syslog(pamh, LOG_NOTICE,
272 "account %s has expired (account expired)",
274 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
275 _("Your account has expired; please contact your system administrator"));
276 D(("account expired"));
277 return PAM_ACCT_EXPIRED;
279 if (spent->sp_lstchg == 0) {
280 pam_syslog(pamh, LOG_NOTICE,
281 "expired password for user %s (root enforced)",
283 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
284 _("You are required to change your password immediately (root enforced)"));
285 D(("need a new password"));
286 return PAM_NEW_AUTHTOK_REQD;
288 if (curdays < spent->sp_lstchg) {
289 pam_syslog(pamh, LOG_DEBUG,
290 "account %s has password changed in future",
294 if ((curdays - spent->sp_lstchg > spent->sp_max)
295 && (curdays - spent->sp_lstchg > spent->sp_inact)
296 && (curdays - spent->sp_lstchg > spent->sp_max + spent->sp_inact)
297 && (spent->sp_max != -1) && (spent->sp_inact != -1)) {
298 pam_syslog(pamh, LOG_NOTICE,
299 "account %s has expired (failed to change password)",
301 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
302 _("Your account has expired; please contact your system administrator"));
303 D(("account expired 2"));
304 return PAM_ACCT_EXPIRED;
306 if ((curdays - spent->sp_lstchg > spent->sp_max) && (spent->sp_max != -1)) {
307 pam_syslog(pamh, LOG_DEBUG,
308 "expired password for user %s (password aged)",
310 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
311 _("You are required to change your password immediately (password aged)"));
312 D(("need a new password 2"));
313 return PAM_NEW_AUTHTOK_REQD;
315 if ((curdays - spent->sp_lstchg > spent->sp_max - spent->sp_warn)
316 && (spent->sp_max != -1) && (spent->sp_warn != -1)) {
317 daysleft = (spent->sp_lstchg + spent->sp_max) - curdays;
318 pam_syslog(pamh, LOG_DEBUG,
319 "password for user %s will expire in %d days",
321 #if defined HAVE_DNGETTEXT && defined ENABLE_NLS
322 snprintf (buf, sizeof (buf),
324 "Warning: your password will expire in %d day",
325 "Warning: your password will expire in %d days",
330 snprintf(buf, sizeof (buf),
331 _("Warning: your password will expire in %d day"),
334 snprintf(buf, sizeof (buf),
335 /* TRANSLATORS: only used if dngettext is not support
337 _("Warning: your password will expire in %d days"),
340 _make_remark(pamh, ctrl, PAM_TEXT_INFO, buf);
349 /* static module data */
351 struct pam_module _pam_unix_acct_modstruct = {