* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
- *
+ *
* ALTERNATIVELY, this product may be distributed under the terms of
* the GNU Public License, in which case the provisions of the GPL are
* required INSTEAD OF the above restrictions. (This clause is
* necessary due to a potential bad interaction between the GPL and
* the restrictions contained in a BSD-style copyright.)
- *
+ *
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
-#include <security/_pam_aconf.h>
+#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <pwd.h>
#include <shadow.h>
#include <time.h> /* for time() */
+#include <errno.h>
+#include <sys/wait.h>
#include <security/_pam_macros.h>
#define PAM_SM_ACCOUNT
#include <security/pam_modules.h>
-#include <security/_pam_modutil.h>
-
-#ifndef LINUX_PAM
-#include <security/pam_appl.h>
-#endif /* LINUX_PAM */
+#include <security/pam_ext.h>
+#include <security/pam_modutil.h>
#include "support.h"
-
+#include "passverify.h"
+
+int _unix_run_verify_binary(pam_handle_t *pamh, unsigned int ctrl,
+ const char *user, int *daysleft)
+{
+ int retval=0, child, fds[2];
+ struct sigaction newsa, oldsa;
+ D(("running verify_binary"));
+
+ /* create a pipe for the messages */
+ if (pipe(fds) != 0) {
+ D(("could not make pipe"));
+ pam_syslog(pamh, LOG_ERR, "Could not make pipe: %m");
+ return PAM_AUTH_ERR;
+ }
+ D(("called."));
+
+ if (off(UNIX_NOREAP, ctrl)) {
+ /*
+ * This code arranges that the demise of the child does not cause
+ * the application to receive a signal it is not expecting - which
+ * may kill the application or worse.
+ *
+ * The "noreap" module argument is provided so that the admin can
+ * override this behavior.
+ */
+ memset(&newsa, '\0', sizeof(newsa));
+ newsa.sa_handler = SIG_DFL;
+ sigaction(SIGCHLD, &newsa, &oldsa);
+ }
+
+ /* fork */
+ child = fork();
+ if (child == 0) {
+ int i=0;
+ struct rlimit rlim;
+ static char *envp[] = { NULL };
+ char *args[] = { NULL, NULL, NULL, NULL };
+
+ /* reopen stdout as pipe */
+ dup2(fds[1], STDOUT_FILENO);
+
+ /* XXX - should really tidy up PAM here too */
+
+ if (getrlimit(RLIMIT_NOFILE,&rlim)==0) {
+ if (rlim.rlim_max >= MAX_FD_NO)
+ rlim.rlim_max = MAX_FD_NO;
+ for (i=0; i < (int)rlim.rlim_max; i++) {
+ if (i != STDOUT_FILENO) {
+ close(i);
+ }
+ }
+ }
+
+ if (geteuid() == 0) {
+ /* must set the real uid to 0 so the helper will not error
+ out if pam is called from setuid binary (su, sudo...) */
+ setuid(0);
+ }
+
+ /* exec binary helper */
+ args[0] = x_strdup(CHKPWD_HELPER);
+ args[1] = x_strdup(user);
+ args[2] = x_strdup("chkexpiry");
+
+ execve(CHKPWD_HELPER, args, envp);
+
+ pam_syslog(pamh, LOG_ERR, "helper binary execve failed: %m");
+ /* should not get here: exit with error */
+ D(("helper binary is not available"));
+ printf("-1\n");
+ exit(PAM_AUTHINFO_UNAVAIL);
+ } else {
+ close(fds[1]);
+ if (child > 0) {
+ char buf[32];
+ int rc=0;
+ rc=waitpid(child, &retval, 0); /* wait for helper to complete */
+ if (rc<0) {
+ pam_syslog(pamh, LOG_ERR, "unix_chkpwd waitpid returned %d: %m", rc);
+ retval = PAM_AUTH_ERR;
+ } else if (!WIFEXITED(retval)) {
+ pam_syslog(pamh, LOG_ERR, "unix_chkpwd abnormal exit: %d", retval);
+ retval = PAM_AUTH_ERR;
+ } else {
+ retval = WEXITSTATUS(retval);
+ rc = pam_modutil_read(fds[0], buf, sizeof(buf) - 1);
+ if(rc > 0) {
+ buf[rc] = '\0';
+ if (sscanf(buf,"%d", daysleft) != 1 )
+ retval = PAM_AUTH_ERR;
+ }
+ else {
+ pam_syslog(pamh, LOG_ERR, "read unix_chkpwd output error %d: %m", rc);
+ retval = PAM_AUTH_ERR;
+ }
+ }
+ } else {
+ pam_syslog(pamh, LOG_ERR, "Fork failed: %m");
+ D(("fork failed"));
+ retval = PAM_AUTH_ERR;
+ }
+ close(fds[0]);
+ }
+
+ if (off(UNIX_NOREAP, ctrl)) {
+ sigaction(SIGCHLD, &oldsa, NULL); /* restore old signal handler */
+ }
+
+ D(("Returning %d",retval));
+ return retval;
+}
+
/*
* PAM framework looks for this entry-point to pass control to the
* account management module.
int argc, const char **argv)
{
unsigned int ctrl;
+ const void *void_uname;
const char *uname;
int retval, daysleft;
- time_t curdays;
struct spwd *spent;
struct passwd *pwent;
- char buf[80];
+ char buf[256];
D(("called."));
- ctrl = _set_ctrl(pamh, flags, NULL, argc, argv);
+ ctrl = _set_ctrl(pamh, flags, NULL, NULL, argc, argv);
- retval = pam_get_item(pamh, PAM_USER, (const void **) &uname);
+ retval = pam_get_item(pamh, PAM_USER, &void_uname);
+ uname = void_uname;
D(("user = `%s'", uname));
if (retval != PAM_SUCCESS || uname == NULL) {
- _log_err(LOG_ALERT, pamh
- ,"could not identify user (from uid=%d)"
- ,getuid());
+ pam_syslog(pamh, LOG_ALERT,
+ "could not identify user (from uid=%lu)",
+ (unsigned long int)getuid());
return PAM_USER_UNKNOWN;
}
- pwent = _pammodutil_getpwnam(pamh, uname);
- if (!pwent) {
- _log_err(LOG_ALERT, pamh
- ,"could not identify user (from getpwnam(%s))"
- ,uname);
- return PAM_USER_UNKNOWN;
+ retval = get_account_info(pamh, uname, &pwent, &spent);
+ if (retval == PAM_USER_UNKNOWN) {
+ pam_syslog(pamh, LOG_ALERT,
+ "could not identify user (from getpwnam(%s))",
+ uname);
+ return retval;
}
- if (!strcmp( pwent->pw_passwd, "*NP*" )) { /* NIS+ */
- uid_t save_euid, save_uid;
-
- save_euid = geteuid();
- save_uid = getuid();
- if (save_uid == pwent->pw_uid)
- setreuid( save_euid, save_uid );
- else {
- setreuid( 0, -1 );
- if (setreuid( -1, pwent->pw_uid ) == -1) {
- setreuid( -1, 0 );
- setreuid( 0, -1 );
- if(setreuid( -1, pwent->pw_uid ) == -1)
- return PAM_CRED_INSUFFICIENT;
- }
- }
- spent = _pammodutil_getspnam (pamh, uname);
- if (save_uid == pwent->pw_uid)
- setreuid( save_uid, save_euid );
- else {
- if (setreuid( -1, 0 ) == -1)
- setreuid( save_uid, -1 );
- setreuid( -1, save_euid );
- }
-
- } else if (!strcmp( pwent->pw_passwd, "x" )) {
- spent = _pammodutil_getspnam (pamh, uname);
- } else {
+ if (retval == PAM_SUCCESS && spent == NULL)
return PAM_SUCCESS;
- }
- if (!spent)
+ if (retval == PAM_UNIX_RUN_HELPER) {
+ retval = _unix_run_verify_binary(pamh, ctrl, uname, &daysleft);
+ if (retval == PAM_AUTHINFO_UNAVAIL &&
+ on(UNIX_BROKEN_SHADOW, ctrl))
+ return PAM_SUCCESS;
+ } else if (retval != PAM_SUCCESS) {
if (on(UNIX_BROKEN_SHADOW,ctrl))
return PAM_SUCCESS;
+ else
+ return retval;
+ } else
+ retval = check_shadow_expiry(pamh, spent, &daysleft);
- if (!spent)
- return PAM_AUTHINFO_UNAVAIL; /* Couldn't get username from shadow */
-
- curdays = time(NULL) / (60 * 60 * 24);
- D(("today is %d, last change %d", curdays, spent->sp_lstchg));
- if ((curdays > spent->sp_expire) && (spent->sp_expire != -1)
- && (spent->sp_lstchg != 0)) {
- _log_err(LOG_NOTICE, pamh
- ,"account %s has expired (account expired)"
- ,uname);
+ switch (retval) {
+ case PAM_ACCT_EXPIRED:
+ pam_syslog(pamh, LOG_NOTICE,
+ "account %s has expired (account expired)",
+ uname);
_make_remark(pamh, ctrl, PAM_ERROR_MSG,
- "Your account has expired; please contact your system administrator");
- D(("account expired"));
- return PAM_ACCT_EXPIRED;
- }
- if ((curdays > (spent->sp_lstchg + spent->sp_max + spent->sp_inact))
- && (spent->sp_max != -1) && (spent->sp_inact != -1)
- && (spent->sp_lstchg != 0)) {
- _log_err(LOG_NOTICE, pamh
- ,"account %s has expired (failed to change password)"
- ,uname);
- _make_remark(pamh, ctrl, PAM_ERROR_MSG,
- "Your account has expired; please contact your system administrator");
- D(("account expired 2"));
- return PAM_ACCT_EXPIRED;
- }
- D(("when was the last change"));
- if (spent->sp_lstchg == 0) {
- _log_err(LOG_NOTICE, pamh
- ,"expired password for user %s (root enforced)"
- ,uname);
- _make_remark(pamh, ctrl, PAM_ERROR_MSG,
- "You are required to change your password immediately (root enforced)");
- D(("need a new password"));
- return PAM_NEW_AUTHTOK_REQD;
- }
- if (((spent->sp_lstchg + spent->sp_max) < curdays) && (spent->sp_max != -1)) {
- _log_err(LOG_DEBUG, pamh
- ,"expired password for user %s (password aged)"
- ,uname);
+ _("Your account has expired; please contact your system administrator"));
+ break;
+ case PAM_NEW_AUTHTOK_REQD:
+ if (daysleft == 0) {
+ pam_syslog(pamh, LOG_NOTICE,
+ "expired password for user %s (root enforced)",
+ uname);
+ _make_remark(pamh, ctrl, PAM_ERROR_MSG,
+ _("You are required to change your password immediately (root enforced)"));
+ } else {
+ pam_syslog(pamh, LOG_DEBUG,
+ "expired password for user %s (password aged)",
+ uname);
+ _make_remark(pamh, ctrl, PAM_ERROR_MSG,
+ _("You are required to change your password immediately (password aged)"));
+ }
+ break;
+ case PAM_AUTHTOK_EXPIRED:
+ pam_syslog(pamh, LOG_NOTICE,
+ "account %s has expired (failed to change password)",
+ uname);
_make_remark(pamh, ctrl, PAM_ERROR_MSG,
- "You are required to change your password immediately (password aged)");
- D(("need a new password 2"));
- return PAM_NEW_AUTHTOK_REQD;
- }
- if ((curdays > (spent->sp_lstchg + spent->sp_max - spent->sp_warn))
- && (spent->sp_max != -1) && (spent->sp_warn != -1)) {
- daysleft = (spent->sp_lstchg + spent->sp_max) - curdays;
- _log_err(LOG_DEBUG, pamh
- ,"password for user %s will expire in %d days"
- ,uname, daysleft);
- snprintf(buf, 80, "Warning: your password will expire in %d day%.2s",
- daysleft, daysleft == 1 ? "" : "s");
- _make_remark(pamh, ctrl, PAM_TEXT_INFO, buf);
+ _("Your account has expired; please contact your system administrator"));
+ break;
+ case PAM_AUTHTOK_ERR:
+ retval = PAM_SUCCESS;
+ /* fallthrough */
+ case PAM_SUCCESS:
+ if (daysleft >= 0) {
+ pam_syslog(pamh, LOG_DEBUG,
+ "password for user %s will expire in %d days",
+ uname, daysleft);
+#if defined HAVE_DNGETTEXT && defined ENABLE_NLS
+ snprintf (buf, sizeof (buf),
+ dngettext(PACKAGE,
+ "Warning: your password will expire in %d day",
+ "Warning: your password will expire in %d days",
+ daysleft),
+ daysleft);
+#else
+ if (daysleft == 1)
+ snprintf(buf, sizeof (buf),
+ _("Warning: your password will expire in %d day"),
+ daysleft);
+ else
+ snprintf(buf, sizeof (buf),
+ /* TRANSLATORS: only used if dngettext is not supported */
+ _("Warning: your password will expire in %d days"),
+ daysleft);
+#endif
+ _make_remark(pamh, ctrl, PAM_TEXT_INFO, buf);
+ }
}
D(("all done"));
- return PAM_SUCCESS;
+ return retval;
}
projects / linux-pam / blobdiff