pam_lastlog.c revision 200413 
1/*-
2 * Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 * Copyright (c) 2001 Mark R V Murray
5 * All rights reserved.
6 * Copyright (c) 2001 Networks Associates Technology, Inc.
7 * All rights reserved.
8 * Copyright (c) 2004 Joe R. Doupnik
9 * All rights reserved.
10 *
11 * Portions of this software were developed for the FreeBSD Project by
12 * ThinkSec AS and NAI Labs, the Security Research Division of Network
13 * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
14 * ("CBOSS"), as part of the DARPA CHATS research program.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 *    notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 *    notice, this list of conditions and the following disclaimer in the
23 *    documentation and/or other materials provided with the distribution.
24 * 3. The name of the author may not be used to endorse or promote
25 *    products derived from this software without specific prior written
26 *    permission.
27 * 4. Neither the name of the University nor the names of its contributors
28 *    may be used to endorse or promote products derived from this software
29 *    without specific prior written permission.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
34 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 * SUCH DAMAGE.
42 */
43
44#include <sys/cdefs.h>
45__FBSDID("$FreeBSD: head/lib/libpam/modules/pam_lastlog/pam_lastlog.c 200413 2009-12-11 14:15:55Z ed $");
46
47#define _BSD_SOURCE
48
49#include <pwd.h>
50#include <time.h>
51#include <ulog.h>
52
53#define PAM_SM_SESSION
54
55#include <security/pam_appl.h>
56#include <security/pam_modules.h>
57#include <security/pam_mod_misc.h>
58
59PAM_EXTERN int
60pam_sm_open_session(pam_handle_t *pamh, int flags,
61    int argc __unused, const char *argv[] __unused)
62{
63	struct passwd *pwd;
64	struct ulog_utmpx *utx;
65	time_t t;
66	const char *user;
67	const void *rhost, *tty;
68	int pam_err;
69
70	pam_err = pam_get_user(pamh, &user, NULL);
71	if (pam_err != PAM_SUCCESS)
72		return (pam_err);
73	if (user == NULL || (pwd = getpwnam(user)) == NULL)
74		return (PAM_SERVICE_ERR);
75	PAM_LOG("Got user: %s", user);
76
77	pam_err = pam_get_item(pamh, PAM_RHOST, &rhost);
78	if (pam_err != PAM_SUCCESS) {
79		PAM_LOG("No PAM_RHOST");
80		goto err;
81	}
82	pam_err = pam_get_item(pamh, PAM_TTY, &tty);
83	if (pam_err != PAM_SUCCESS) {
84		PAM_LOG("No PAM_TTY");
85		goto err;
86	}
87	if (tty == NULL) {
88		PAM_LOG("No PAM_TTY");
89		pam_err = PAM_SERVICE_ERR;
90		goto err;
91	}
92
93	if ((flags & PAM_SILENT) == 0) {
94		if (ulog_setutxfile(UTXF_LASTLOG, NULL) != 0) {
95			PAM_LOG("Failed to open lastlog database");
96		} else {
97			utx = ulog_getutxuser(user);
98			if (utx != NULL && utx->ut_type == USER_PROCESS) {
99				t = utx->ut_tv.tv_sec;
100				if (*utx->ut_host != '\0')
101					pam_info(pamh, "Last login: %.*s from %s",
102					    24 - 5, ctime(&t), utx->ut_host);
103				else
104					pam_info(pamh, "Last login: %.*s on %s",
105					    24 - 5, ctime(&t), utx->ut_line);
106			}
107			ulog_endutxent();
108		}
109	}
110
111	ulog_login(tty, user, rhost);
112
113	return (PAM_SUCCESS);
114
115err:
116	if (openpam_get_option(pamh, "no_fail"))
117		return (PAM_SUCCESS);
118	return (pam_err);
119}
120
121PAM_EXTERN int
122pam_sm_close_session(pam_handle_t *pamh, int flags __unused,
123    int argc __unused, const char *argv[] __unused)
124{
125	const void *tty;
126	int pam_err;
127
128	pam_err = pam_get_item(pamh, PAM_TTY, (const void **)&tty);
129	if (pam_err != PAM_SUCCESS)
130		goto err;
131	if (tty == NULL) {
132		PAM_LOG("No PAM_TTY");
133		pam_err = PAM_SERVICE_ERR;
134		goto err;
135	}
136	ulog_logout(tty);
137	return (PAM_SUCCESS);
138
139 err:
140	if (openpam_get_option(pamh, "no_fail"))
141		return (PAM_SUCCESS);
142	return (pam_err);
143}
144
145PAM_MODULE_ENTRY("pam_lastlog");
146