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-rw-r--r--modules/pam_unix/pam_unix_acct.c291
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diff --git a/modules/pam_unix/pam_unix_acct.c b/modules/pam_unix/pam_unix_acct.c
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+/*
+ * pam_unix account management
+ *
+ * Copyright Elliot Lee, 1996. All rights reserved.
+ * Copyright Jan Rękorajski, 1999. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, and the entire permission notice in its entirety,
+ * including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 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
+ * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/resource.h>
+#include <syslog.h>
+#include <pwd.h>
+#include <shadow.h>
+#include <time.h> /* for time() */
+#include <errno.h>
+#include <sys/wait.h>
+
+#include <security/_pam_macros.h>
+
+#include <security/pam_modules.h>
+#include <security/pam_ext.h>
+#include <security/pam_modutil.h>
+
+#include "pam_cc_compat.h"
+#include "support.h"
+#include "passverify.h"
+
+int _unix_run_verify_binary(pam_handle_t *pamh, unsigned long long 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) {
+ static char *envp[] = { NULL };
+ const char *args[] = { NULL, NULL, NULL, NULL };
+
+ /* XXX - should really tidy up PAM here too */
+
+ /* reopen stdout as pipe */
+ if (dup2(fds[1], STDOUT_FILENO) != STDOUT_FILENO) {
+ pam_syslog(pamh, LOG_ERR, "dup2 of %s failed: %m", "stdout");
+ _exit(PAM_AUTHINFO_UNAVAIL);
+ }
+
+ if (pam_modutil_sanitize_helper_fds(pamh, PAM_MODUTIL_PIPE_FD,
+ PAM_MODUTIL_IGNORE_FD,
+ PAM_MODUTIL_PIPE_FD) < 0) {
+ _exit(PAM_AUTHINFO_UNAVAIL);
+ }
+
+ 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...) */
+ if (setuid(0) == -1) {
+ pam_syslog(pamh, LOG_ERR, "setuid failed: %m");
+ printf("-1\n");
+ fflush(stdout);
+ _exit(PAM_AUTHINFO_UNAVAIL);
+ }
+ }
+
+ /* exec binary helper */
+ args[0] = CHKPWD_HELPER;
+ args[1] = user;
+ args[2] = "chkexpiry";
+
+ DIAG_PUSH_IGNORE_CAST_QUAL;
+ execve(CHKPWD_HELPER, (char *const *) args, envp);
+ DIAG_POP_IGNORE_CAST_QUAL;
+
+ 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");
+ fflush(stdout);
+ _exit(PAM_AUTHINFO_UNAVAIL);
+ } else {
+ close(fds[1]);
+ if (child > 0) {
+ char buf[32];
+ int rc=0;
+ /* wait for helper to complete: */
+ while ((rc=waitpid(child, &retval, 0)) < 0 && errno == EINTR);
+ 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
+pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc, const char **argv)
+{
+ unsigned long long ctrl;
+ const void *void_uname;
+ const char *uname;
+ int retval, daysleft = -1;
+ char buf[256];
+
+ D(("called."));
+
+ ctrl = _set_ctrl(pamh, flags, NULL, NULL, NULL, argc, argv);
+
+ retval = pam_get_item(pamh, PAM_USER, &void_uname);
+ uname = void_uname;
+ D(("user = `%s'", uname));
+ if (retval != PAM_SUCCESS || uname == NULL) {
+ pam_syslog(pamh, LOG_ERR,
+ "could not identify user (from uid=%lu)",
+ (unsigned long int)getuid());
+ return PAM_USER_UNKNOWN;
+ }
+
+ retval = _unix_verify_user(pamh, ctrl, uname, &daysleft);
+
+ if (on(UNIX_NO_PASS_EXPIRY, ctrl)) {
+ const void *pretval = NULL;
+ int authrv = PAM_AUTHINFO_UNAVAIL; /* authentication not called */
+
+ if (pam_get_data(pamh, "unix_setcred_return", &pretval) == PAM_SUCCESS
+ && pretval)
+ authrv = *(const int *)pretval;
+
+ if (authrv != PAM_SUCCESS
+ && (retval == PAM_NEW_AUTHTOK_REQD || retval == PAM_AUTHTOK_EXPIRED))
+ retval = PAM_SUCCESS;
+ }
+
+ 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."));
+ 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 (administrator 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 expired)."));
+ }
+ 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,
+ _("Your account has expired; please contact your system administrator."));
+ break;
+ case PAM_AUTHTOK_ERR:
+ /*
+ * We ignore "password changed too early" error
+ * as it is relevant only for password change.
+ */
+ 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 retval;
+}
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