1268896Sbapt/*-
2268896Sbapt * Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994
3268896Sbapt *	The Regents of the University of California.  All rights reserved.
4268896Sbapt * 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("$FreeBSD$");
46
47#define _BSD_SOURCE
48
49#include <sys/time.h>
50
51#include <paths.h>
52#include <stdlib.h>
53#include <string.h>
54#include <time.h>
55#include <unistd.h>
56#include <utmpx.h>
57
58#define PAM_SM_SESSION
59
60#include <security/pam_appl.h>
61#include <security/pam_modules.h>
62#include <security/pam_mod_misc.h>
63
64#define	PAM_UTMPX_ID	"utmpx_id"
65
66PAM_EXTERN int
67pam_sm_open_session(pam_handle_t *pamh, int flags,
68    int argc __unused, const char *argv[] __unused)
69{
70	struct utmpx *utx, utl;
71	time_t t;
72	const char *user;
73	const void *rhost, *tty;
74	char *id;
75	int pam_err;
76
77	pam_err = pam_get_user(pamh, &user, NULL);
78	if (pam_err != PAM_SUCCESS)
79		return (pam_err);
80	if (user == NULL)
81		return (PAM_SERVICE_ERR);
82	PAM_LOG("Got user: %s", user);
83
84	pam_err = pam_get_item(pamh, PAM_RHOST, &rhost);
85	if (pam_err != PAM_SUCCESS) {
86		PAM_LOG("No PAM_RHOST");
87		goto err;
88	}
89	pam_err = pam_get_item(pamh, PAM_TTY, &tty);
90	if (pam_err != PAM_SUCCESS) {
91		PAM_LOG("No PAM_TTY");
92		goto err;
93	}
94	if (tty == NULL) {
95		PAM_LOG("No PAM_TTY");
96		pam_err = PAM_SERVICE_ERR;
97		goto err;
98	}
99	/* Strip /dev/ component. */
100	if (strncmp(tty, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
101		tty = (const char *)tty + sizeof(_PATH_DEV) - 1;
102
103	if ((flags & PAM_SILENT) == 0) {
104		if (setutxdb(UTXDB_LASTLOGIN, NULL) != 0) {
105			PAM_LOG("Failed to open lastlogin database");
106		} else {
107			utx = getutxuser(user);
108			if (utx != NULL && utx->ut_type == USER_PROCESS) {
109				t = utx->ut_tv.tv_sec;
110				if (*utx->ut_host != '\0')
111					pam_info(pamh, "Last login: %.*s from %s",
112					    24 - 5, ctime(&t), utx->ut_host);
113				else
114					pam_info(pamh, "Last login: %.*s on %s",
115					    24 - 5, ctime(&t), utx->ut_line);
116			}
117			endutxent();
118		}
119	}
120
121	id = malloc(sizeof utl.ut_id);
122	if (id == NULL) {
123		pam_err = PAM_SERVICE_ERR;
124		goto err;
125	}
126	arc4random_buf(id, sizeof utl.ut_id);
127
128	pam_err = pam_set_data(pamh, PAM_UTMPX_ID, id, openpam_free_data);
129	if (pam_err != PAM_SUCCESS) {
130		free(id);
131		goto err;
132	}
133
134	memset(&utl, 0, sizeof utl);
135	utl.ut_type = USER_PROCESS;
136	memcpy(utl.ut_id, id, sizeof utl.ut_id);
137	strncpy(utl.ut_user, user, sizeof utl.ut_user);
138	strncpy(utl.ut_line, tty, sizeof utl.ut_line);
139	if (rhost != NULL)
140		strncpy(utl.ut_host, rhost, sizeof utl.ut_host);
141	utl.ut_pid = getpid();
142	gettimeofday(&utl.ut_tv, NULL);
143	pututxline(&utl);
144
145	return (PAM_SUCCESS);
146
147err:
148	if (openpam_get_option(pamh, "no_fail"))
149		return (PAM_SUCCESS);
150	return (pam_err);
151}
152
153PAM_EXTERN int
154pam_sm_close_session(pam_handle_t *pamh, int flags __unused,
155    int argc __unused, const char *argv[] __unused)
156{
157	struct utmpx utl;
158	const void *id;
159	int pam_err;
160
161	pam_err = pam_get_data(pamh, PAM_UTMPX_ID, (const void **)&id);
162	if (pam_err != PAM_SUCCESS)
163		goto err;
164
165	memset(&utl, 0, sizeof utl);
166	utl.ut_type = DEAD_PROCESS;
167	memcpy(utl.ut_id, id, sizeof utl.ut_id);
168	utl.ut_pid = getpid();
169	gettimeofday(&utl.ut_tv, NULL);
170	pututxline(&utl);
171
172	return (PAM_SUCCESS);
173
174 err:
175	if (openpam_get_option(pamh, "no_fail"))
176		return (PAM_SUCCESS);
177	return (pam_err);
178}
179
180PAM_MODULE_ENTRY("pam_lastlog");
181