text: /*-
   * Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994
   *	The Regents of the University of California.  All rights reserved.
   * Copyright (c) 2001 Mark R V Murray
   * All rights reserved.
   * Copyright (c) 2001 Networks Associates Technology, Inc.
   * All rights reserved.
   * Copyright (c) 2004 Joe R. Doupnik
   * All rights reserved.
   *
   * Portions of this software were developed for the FreeBSD Project by
   * ThinkSec AS and NAI Labs, the Security Research Division of Network
   * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
   * ("CBOSS"), as part of the DARPA CHATS research program.
   *
   * 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, this list of conditions and the following disclaimer.
   * 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.
   * 4. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 <sys/cdefs.h>
  __FBSDID("$FreeBSD: releng/11.0/lib/libpam/modules/pam_lastlog/pam_lastlog.c 269115 2014-07-26 07:40:31Z des $");
  
  #define _BSD_SOURCE
  
  #include <sys/time.h>
  
  #include <paths.h>
  #include <stdlib.h>
  #include <string.h>
  #include <time.h>
  #include <unistd.h>
  #include <utmpx.h>
  
  #define PAM_SM_SESSION
  
  #include <security/pam_appl.h>
  #include <security/pam_modules.h>
  #include <security/pam_mod_misc.h>
  
  #define	PAM_UTMPX_ID	"utmpx_id"
  
  PAM_EXTERN int
  pam_sm_open_session(pam_handle_t *pamh, int flags,
      int argc __unused, const char *argv[] __unused)
  {
  	struct utmpx *utx, utl;
  	time_t t;
  	const char *user;
  	const void *rhost, *tty;
  	char *id;
  	int pam_err;
  
  	pam_err = pam_get_user(pamh, &user, NULL);
  	if (pam_err != PAM_SUCCESS)
  		return (pam_err);
  	if (user == NULL)
  		return (PAM_SERVICE_ERR);
  	PAM_LOG("Got user: %s", user);
  
  	pam_err = pam_get_item(pamh, PAM_RHOST, &rhost);
  	if (pam_err != PAM_SUCCESS) {
  		PAM_LOG("No PAM_RHOST");
  		goto err;
  	}
  	pam_err = pam_get_item(pamh, PAM_TTY, &tty);
  	if (pam_err != PAM_SUCCESS) {
  		PAM_LOG("No PAM_TTY");
  		goto err;
  	}
  	if (tty == NULL) {
  		PAM_LOG("No PAM_TTY");
  		pam_err = PAM_SERVICE_ERR;
  		goto err;
  	}
  	/* Strip /dev/ component. */
  	if (strncmp(tty, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
  		tty = (const char *)tty + sizeof(_PATH_DEV) - 1;
  
  	if ((flags & PAM_SILENT) == 0) {
  		if (setutxdb(UTXDB_LASTLOGIN, NULL) != 0) {
  			PAM_LOG("Failed to open lastlogin database");
  		} else {
  			utx = getutxuser(user);
  			if (utx != NULL && utx->ut_type == USER_PROCESS) {
  				t = utx->ut_tv.tv_sec;
  				if (*utx->ut_host != '\0')
  					pam_info(pamh, "Last login: %.*s from %s",
  					    24 - 5, ctime(&t), utx->ut_host);
  				else
  					pam_info(pamh, "Last login: %.*s on %s",
  					    24 - 5, ctime(&t), utx->ut_line);
  			}
  			endutxent();
  		}
  	}
  
  	id = malloc(sizeof utl.ut_id);
  	if (id == NULL) {
  		pam_err = PAM_SERVICE_ERR;
  		goto err;
  	}
  	arc4random_buf(id, sizeof utl.ut_id);
  
  	pam_err = pam_set_data(pamh, PAM_UTMPX_ID, id, openpam_free_data);
  	if (pam_err != PAM_SUCCESS) {
  		free(id);
  		goto err;
  	}
  
  	memset(&utl, 0, sizeof utl);
  	utl.ut_type = USER_PROCESS;
  	memcpy(utl.ut_id, id, sizeof utl.ut_id);
  	strncpy(utl.ut_user, user, sizeof utl.ut_user);
  	strncpy(utl.ut_line, tty, sizeof utl.ut_line);
  	if (rhost != NULL)
  		strncpy(utl.ut_host, rhost, sizeof utl.ut_host);
  	utl.ut_pid = getpid();
  	gettimeofday(&utl.ut_tv, NULL);
  	pututxline(&utl);
  
  	return (PAM_SUCCESS);
  
  err:
  	if (openpam_get_option(pamh, "no_fail"))
  		return (PAM_SUCCESS);
  	return (pam_err);
  }
  
  PAM_EXTERN int
  pam_sm_close_session(pam_handle_t *pamh, int flags __unused,
      int argc __unused, const char *argv[] __unused)
  {
  	struct utmpx utl;
  	const void *id;
  	int pam_err;
  
  	pam_err = pam_get_data(pamh, PAM_UTMPX_ID, (const void **)&id);
  	if (pam_err != PAM_SUCCESS)
  		goto err;
  
  	memset(&utl, 0, sizeof utl);
  	utl.ut_type = DEAD_PROCESS;
  	memcpy(utl.ut_id, id, sizeof utl.ut_id);
  	utl.ut_pid = getpid();
  	gettimeofday(&utl.ut_tv, NULL);
  	pututxline(&utl);
  
  	return (PAM_SUCCESS);
  
   err:
  	if (openpam_get_option(pamh, "no_fail"))
  		return (PAM_SUCCESS);
  	return (pam_err);
  }
  
  PAM_MODULE_ENTRY("pam_lastlog");
  