1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1987, 1988, 1991, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 * Copyright (c) 2001 Mark R V Murray
7 * All rights reserved.
8 * Copyright (c) 2001 Networks Associates Technology, Inc.
9 * All rights reserved.
10 * Copyright (c) 2004 Joe R. Doupnik
11 * All rights reserved.
12 *
13 * Portions of this software were developed for the FreeBSD Project by
14 * ThinkSec AS and NAI Labs, the Security Research Division of Network
15 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
16 * ("CBOSS"), as part of the DARPA CHATS research program.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
20 * are met:
21 * 1. Redistributions of source code must retain the above copyright
22 * notice, this list of conditions and the following disclaimer.
23 * 2. Redistributions in binary form must reproduce the above copyright
24 * notice, this list of conditions and the following disclaimer in the
25 * documentation and/or other materials provided with the distribution.
26 * 3. The name of the author may not be used to endorse or promote
27 * products derived from this software without specific prior written
28 * permission.
29 * 4. Neither the name of the University nor the names of its contributors
30 * may be used to endorse or promote products derived from this software
31 * without specific prior written permission.
32 *
33 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
34 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
35 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
36 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
37 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
38 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
39 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
41 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
42 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
43 * SUCH DAMAGE.
44 */
45
46 #include <sys/cdefs.h>
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
66 PAM_EXTERN int
pam_sm_open_session(pam_handle_t * pamh,int flags,int argc __unused,const char * argv[]__unused)67 pam_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
147 err:
148 if (openpam_get_option(pamh, "no_fail"))
149 return (PAM_SUCCESS);
150 return (pam_err);
151 }
152
153 PAM_EXTERN int
pam_sm_close_session(pam_handle_t * pamh,int flags __unused,int argc __unused,const char * argv[]__unused)154 pam_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
180 PAM_MODULE_ENTRY("pam_lastlog");
181