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 <security/_pam_macros.h>
53 /* indicate that the following groups are defined */
55 #define PAM_SM_ACCOUNT
57 #include <security/pam_modules.h>
58 #include <security/pam_ext.h>
59 #include <security/pam_modutil.h>
62 #include "passverify.h"
64 int _unix_run_verify_binary(pam_handle_t *pamh, unsigned int ctrl,
65 const char *user, int *daysleft)
67 int retval=0, child, fds[2];
68 void (*sighandler)(int) = NULL;
69 D(("running verify_binary"));
71 /* create a pipe for the messages */
73 D(("could not make pipe"));
74 pam_syslog(pamh, LOG_ERR, "Could not make pipe: %m");
79 if (off(UNIX_NOREAP, ctrl)) {
81 * This code arranges that the demise of the child does not cause
82 * the application to receive a signal it is not expecting - which
83 * may kill the application or worse.
85 * The "noreap" module argument is provided so that the admin can
86 * override this behavior.
88 sighandler = signal(SIGCHLD, SIG_DFL);
96 static char *envp[] = { NULL };
97 char *args[] = { NULL, NULL, NULL, NULL };
100 /* reopen stdin as pipe */
102 dup2(fds[1], STDOUT_FILENO);
104 /* XXX - should really tidy up PAM here too */
106 if (getrlimit(RLIMIT_NOFILE,&rlim)==0) {
107 for (i=2; i < rlim.rlim_max; i++) {
108 if ((unsigned int)fds[1] != i) {
114 if (geteuid() == 0) {
115 /* must set the real uid to 0 so the helper will not error
116 out if pam is called from setuid binary (su, sudo...) */
120 /* exec binary helper */
121 args[0] = x_strdup(CHKPWD_HELPER);
122 args[1] = x_strdup(user);
123 args[2] = x_strdup("chkexpiry");
125 execve(CHKPWD_HELPER, args, envp);
127 pam_syslog(pamh, LOG_ERR, "helper binary execve failed: %m");
128 /* should not get here: exit with error */
130 D(("helper binary is not available"));
132 exit(PAM_AUTHINFO_UNAVAIL);
138 rc=waitpid(child, &retval, 0); /* wait for helper to complete */
140 pam_syslog(pamh, LOG_ERR, "unix_chkpwd waitpid returned %d: %m", rc);
141 retval = PAM_AUTH_ERR;
143 retval = WEXITSTATUS(retval);
144 rc = pam_modutil_read(fds[0], buf, sizeof(buf) - 1);
147 if (sscanf(buf,"%d", daysleft) != 1 )
148 retval = PAM_AUTH_ERR;
151 pam_syslog(pamh, LOG_ERR, "read unix_chkpwd output error %d: %m", rc);
152 retval = PAM_AUTH_ERR;
156 pam_syslog(pamh, LOG_ERR, "Fork failed: %m");
158 retval = PAM_AUTH_ERR;
162 if (sighandler != SIG_ERR) {
163 (void) signal(SIGCHLD, sighandler); /* restore old signal handler */
165 D(("Returning %d",retval));
170 * PAM framework looks for this entry-point to pass control to the
171 * account management module.
174 PAM_EXTERN int pam_sm_acct_mgmt(pam_handle_t * pamh, int flags,
175 int argc, const char **argv)
178 const void *void_uname;
180 int retval, daysleft;
182 struct passwd *pwent;
187 ctrl = _set_ctrl(pamh, flags, NULL, NULL, argc, argv);
189 retval = pam_get_item(pamh, PAM_USER, &void_uname);
191 D(("user = `%s'", uname));
192 if (retval != PAM_SUCCESS || uname == NULL) {
193 pam_syslog(pamh, LOG_ALERT,
194 "could not identify user (from uid=%lu)",
195 (unsigned long int)getuid());
196 return PAM_USER_UNKNOWN;
199 retval = get_account_info(pamh, uname, &pwent, &spent);
200 if (retval == PAM_USER_UNKNOWN) {
201 pam_syslog(pamh, LOG_ALERT,
202 "could not identify user (from getpwnam(%s))",
207 if (retval == PAM_SUCCESS && spent == NULL)
210 if (retval == PAM_UNIX_RUN_HELPER) {
211 retval = _unix_run_verify_binary(pamh, ctrl, uname, &daysleft);
212 if (retval == PAM_AUTHINFO_UNAVAIL &&
213 on(UNIX_BROKEN_SHADOW, ctrl))
215 } else if (retval != PAM_SUCCESS) {
216 if (on(UNIX_BROKEN_SHADOW,ctrl))
221 retval = check_shadow_expiry(pamh, spent, &daysleft);
224 case PAM_ACCT_EXPIRED:
225 pam_syslog(pamh, LOG_NOTICE,
226 "account %s has expired (account expired)",
228 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
229 _("Your account has expired; please contact your system administrator"));
231 case PAM_NEW_AUTHTOK_REQD:
233 pam_syslog(pamh, LOG_NOTICE,
234 "expired password for user %s (root enforced)",
236 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
237 _("You are required to change your password immediately (root enforced)"));
239 pam_syslog(pamh, LOG_DEBUG,
240 "expired password for user %s (password aged)",
242 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
243 _("You are required to change your password immediately (password aged)"));
246 case PAM_AUTHTOK_EXPIRED:
247 pam_syslog(pamh, LOG_NOTICE,
248 "account %s has expired (failed to change password)",
250 _make_remark(pamh, ctrl, PAM_ERROR_MSG,
251 _("Your account has expired; please contact your system administrator"));
255 pam_syslog(pamh, LOG_DEBUG,
256 "password for user %s will expire in %d days",
258 #if defined HAVE_DNGETTEXT && defined ENABLE_NLS
259 snprintf (buf, sizeof (buf),
261 "Warning: your password will expire in %d day",
262 "Warning: your password will expire in %d days",
267 snprintf(buf, sizeof (buf),
268 _("Warning: your password will expire in %d day"),
271 snprintf(buf, sizeof (buf),
272 /* TRANSLATORS: only used if dngettext is not supported */
273 _("Warning: your password will expire in %d days"),
276 _make_remark(pamh, ctrl, PAM_TEXT_INFO, buf);
286 /* static module data */
288 struct pam_module _pam_unix_acct_modstruct = {