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/*-
* 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.
*
* 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("$FreeBSD$");
#define _BSD_SOURCE
#include <sys/param.h>
#include <fcntl.h>
#include <libutil.h>
#include <paths.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
#include <utmp.h>
#define PAM_SM_SESSION
#include <security/pam_appl.h>
#include <security/pam_modules.h>
#include <security/pam_mod_misc.h>
PAM_EXTERN int
pam_sm_open_session(pam_handle_t *pamh, int flags,
int argc __unused, const char *argv[] __unused)
{
struct passwd *pwd;
struct utmp utmp;
struct lastlog ll;
time_t t;
const char *rhost, *user, *tty;
off_t llpos;
int fd, pam_err;
pam_err = pam_get_user(pamh, &user, NULL);
if (pam_err != PAM_SUCCESS)
return (pam_err);
if (user == NULL || (pwd = getpwnam(user)) == NULL)
return (PAM_SERVICE_ERR);
PAM_LOG("Got user: %s", user);
pam_err = pam_get_item(pamh, PAM_RHOST, (const void **)&rhost);
if (pam_err != PAM_SUCCESS)
goto err;
pam_err = pam_get_item(pamh, PAM_TTY, (const void **)&tty);
if (pam_err != PAM_SUCCESS)
goto err;
if (tty == NULL) {
pam_err = PAM_SERVICE_ERR;
goto err;
}
if (strncmp(tty, _PATH_DEV, strlen(_PATH_DEV)) == 0)
tty += strlen(_PATH_DEV);
if (*tty == '\0')
return (PAM_SERVICE_ERR);
fd = open(_PATH_LASTLOG, O_RDWR|O_CREAT, 0644);
if (fd == -1)
goto file_err;
/*
* Record session in lastlog(5).
*/
llpos = (off_t)(pwd->pw_uid * sizeof(ll));
if (lseek(fd, llpos, L_SET) != llpos)
goto file_err;
if ((flags & PAM_SILENT) == 0) {
if (read(fd, &ll, sizeof ll) == sizeof ll && ll.ll_time != 0) {
t = ll.ll_time;
if (*ll.ll_host != '\0')
pam_info(pamh, "Last login: %.*s from %.*s",
24 - 5, ctime(&t),
(int)sizeof(ll.ll_host), ll.ll_host);
else
pam_info(pamh, "Last login: %.*s on %.*s",
24 - 5, ctime(&t),
(int)sizeof(ll.ll_line), ll.ll_line);
}
if (lseek(fd, llpos, L_SET) != llpos)
goto file_err;
}
bzero(&ll, sizeof(ll));
ll.ll_time = time(NULL);
/* note: does not need to be NUL-terminated */
strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
if (rhost != NULL)
/* note: does not need to be NUL-terminated */
strncpy(ll.ll_host, rhost, sizeof(ll.ll_host));
if (write(fd, (char *)&ll, sizeof(ll)) != sizeof(ll) || close(fd) != 0)
goto file_err;
PAM_LOG("Login recorded in %s", _PATH_LASTLOG);
/*
* Record session in utmp(5) and wtmp(5).
*/
bzero(&utmp, sizeof(utmp));
utmp.ut_time = time(NULL);
/* note: does not need to be NUL-terminated */
strncpy(utmp.ut_name, user, sizeof(utmp.ut_name));
if (rhost != NULL)
strncpy(utmp.ut_host, rhost, sizeof(utmp.ut_host));
(void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line));
login(&utmp);
return (PAM_SUCCESS);
file_err:
syslog(LOG_ERR, "%s: %m", _PATH_LASTLOG);
if (fd != -1)
close(fd);
pam_err = PAM_SYSTEM_ERR;
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 __unused, int flags __unused,
int argc __unused, const char *argv[] __unused)
{
return (PAM_SUCCESS);
}
PAM_MODULE_ENTRY("pam_lastlog");
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