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Add a PAM module that records sessions in utmp/wtmp/lastlog.

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Sponsored by:	DARPA, NAI Labs
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Dag-Erling Smørgrav 2002-01-24 09:45:17 +00:00
parent c2d5249eaf
commit 16e058b5d6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=89728
3 changed files with 369 additions and 0 deletions
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32
lib/libpam/modules/pam_lastlog/Makefile Normal file
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# Copyright 2001 Mark R V Murray
# 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, 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.
#
# 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.
#
# $FreeBSD$
LIB= pam_lastlog
SHLIB_NAME= pam_lastlog.so
SRCS= pam_lastlog.c
MAN= pam_lastlog.8
.include <bsd.lib.mk>

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lib/libpam/modules/pam_lastlog/pam_lastlog.8 Normal file
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.\" Copyright (c) 2001 Mark R V Murray
.\" All rights reserved.
.\" Copyright (c) 2001 Networks Associates Technologies, 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.
.\"
.\" 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.
.\"
.\" $FreeBSD$
.\"
.Dd January 24, 2002
.Dt PAM_LASTLOG 8
.Os
.Sh NAME
.Nm pam_lastlog
.Nd login accounting PAM module
.Sh SYNOPSIS
.Op Ar service-name
.Ar module-type
.Ar control-flag
.Pa pam_lastlog
.Op Ar options
.Sh DESCRIPTION
The login accounting service module for PAM,
.Nm
provides functionality for only one PAM category:
session management.
In terms of the
.Ar module-type
parameter, this is the
.Dq Li session
feature.
.Ss Login Accounting Session Management Module
The login accounting session management component provides functions
to initiate
.Pq Fn pam_sm_open_session
and terminate
.Pq Fn pam_sm_close_session
sessions.
The
.Fn pam_sm_open_session
function records the session in the
.Xr utmp 5 ,
.Xr wtmp 5
and
.Xr lastlog 5
databases.
The
.Fn pam_sm_close_session
records the end of the session in the
.Xr utmp 5
and
.Xr wtmp 5
databases.
.Sh SEE ALSO
.Xr last 1 ,
.Xr lastlogin 1 ,
.Xr login 3 ,
.Xr logout 3 ,
.Xr utmp 5 ,
.Xr w 1 ,
.Xr pam.conf 5 ,
.Xr pam 8
.Sh AUTHORS
The
.Nm
module and this manual page 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
.Pq Dq CBOSS ,
as part of the DARPA CHATS research program.

240
lib/libpam/modules/pam_lastlog/pam_lastlog.c Normal file
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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 Technologies, 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 <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_AUTH
#define PAM_SM_ACCOUNT
#define PAM_SM_SESSION
#define PAM_SM_PASSWORD
#include <security/pam_modules.h>
#include <pam_mod_misc.h>
extern int login_access(const char *, const char *);
PAM_EXTERN int
pam_sm_authenticate(pam_handle_t *pamh, int flags, int argc, const char **argv)
{
struct options options;
pam_std_option(&options, NULL, argc, argv);
PAM_LOG("Options processed");
PAM_RETURN(PAM_IGNORE);
}
PAM_EXTERN int
pam_sm_setcred(pam_handle_t *pamh, int flags, int argc, const char **argv)
{
struct options options;
pam_std_option(&options, NULL, argc, argv);
PAM_LOG("Options processed");
PAM_RETURN(PAM_IGNORE);
}
PAM_EXTERN int
pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc ,const char **argv)
{
struct options options;
pam_std_option(&options, NULL, argc, argv);
PAM_LOG("Options processed");
PAM_RETURN(PAM_IGNORE);
}
PAM_EXTERN int
pam_sm_chauthtok(pam_handle_t *pamh, int flags, int argc, const char **argv)
{
struct options options;
pam_std_option(&options, NULL, argc, argv);
PAM_LOG("Options processed");
PAM_RETURN(PAM_IGNORE);
}
PAM_EXTERN int
pam_sm_open_session(pam_handle_t *pamh, int flags, int argc, const char **argv)
{
struct options options;
struct passwd *pwd;
struct utmp utmp;
struct lastlog ll;
const char *rhost, *user, *tty;
char *buf;
off_t llpos;
int fd, pam_err;
pam_std_option(&options, NULL, argc, argv);
PAM_LOG("Options processed");
pam_err = pam_get_item(pamh, PAM_USER, (const void **)&user);
if (pam_err != PAM_SUCCESS)
PAM_RETURN(pam_err);
if (user == NULL || (pwd = getpwnam(user)) == NULL)
PAM_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)
PAM_RETURN(pam_err);
pam_err = pam_get_item(pamh, PAM_TTY, (const void **)&tty);
if (pam_err != PAM_SUCCESS)
PAM_RETURN(pam_err);
if (tty == NULL)
PAM_RETURN(PAM_SERVICE_ERR);
fd = open(_PATH_LASTLOG, O_RDWR, 0);
if (fd == -1) {
syslog(LOG_ERR, "cannot open %s: %m", _PATH_LASTLOG);
PAM_RETURN(PAM_SERVICE_ERR);
}
/*
* Record session in utmp(5) and wtmp(5).
*/
bzero(&utmp, sizeof(utmp));
time(&utmp.ut_time);
/* note: does not need to be NUL-terminated */
strncpy(utmp.ut_name, user, sizeof(utmp.ut_name));
if (rhost)
strncpy(utmp.ut_host, rhost, sizeof(utmp.ut_host));
(void)strncpy(utmp.ut_line, tty, sizeof(utmp.ut_line));
login(&utmp);
/*
* 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) {
asprintf(&buf, "Last login: %.*s ", 24 - 5,
ctime(&ll.ll_time));
if (buf != NULL) {
pam_prompt(pamh, PAM_TEXT_INFO, buf, NULL);
free(buf);
}
if (*ll.ll_host != '\0')
asprintf(&buf, "from %.*s\n",
(int)sizeof(ll.ll_host), ll.ll_host);
else
asprintf(&buf, "on %.*s\n",
(int)sizeof(ll.ll_line), ll.ll_line);
if (buf != NULL) {
pam_prompt(pamh, PAM_TEXT_INFO, buf, NULL);
free(buf);
}
}
if (lseek(fd, llpos, L_SET) != llpos)
goto file_err;
}
bzero(&ll, sizeof(ll));
time(&ll.ll_time);
/* note: does not need to be NUL-terminated */
strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
if (rhost)
/* 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);
PAM_RETURN(PAM_IGNORE);
file_err:
syslog(LOG_ERR, "%s: %m", _PATH_LASTLOG);
close(fd);
PAM_RETURN(PAM_SERVICE_ERR);
}
PAM_EXTERN int
pam_sm_close_session(pam_handle_t *pamh, int flags, int argc, const char **argv)
{
struct options options;
const char *tty;
int pam_err;
pam_std_option(&options, NULL, argc, argv);
PAM_LOG("Options processed");
pam_err = pam_get_item(pamh, PAM_TTY, (const void **)&tty);
if (pam_err != PAM_SUCCESS)
PAM_RETURN(pam_err);
if (tty != NULL)
logout(tty);
PAM_RETURN(PAM_SUCCESS);
}
PAM_MODULE_ENTRY("pam_lastlog");