pam_nologin.c revision 87398 
1/*-
2 * Copyright 2001 Mark R V Murray
3 * All rights reserved.
4 * Copyright (c) 2001 Networks Associates Technologies, Inc.
5 * All rights reserved.
6 *
7 * Portions of this software were developed for the FreeBSD Project by
8 * ThinkSec AS and NAI Labs, the Security Research Division of Network
9 * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
10 * ("CBOSS"), as part of the DARPA CHATS research program.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. The name of the author may not be used to endorse or promote
21 *    products derived from this software without specific prior written
22 *    permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: head/lib/libpam/modules/pam_nologin/pam_nologin.c 87398 2001-12-05 16:06:35Z des $");
39
40#include <sys/types.h>
41#include <sys/stat.h>
42#include <fcntl.h>
43#include <login_cap.h>
44#include <pwd.h>
45#include <stdio.h>
46#include <stdlib.h>
47#include <unistd.h>
48
49#define PAM_SM_AUTH
50#define PAM_SM_ACCOUNT
51#define PAM_SM_SESSION
52#define PAM_SM_PASSWORD
53
54#include <security/_pam_macros.h>
55#include <security/pam_modules.h>
56#include "pam_mod_misc.h"
57
58#define	NOLOGIN	"/var/run/nologin"
59
60PAM_EXTERN int
61pam_sm_authenticate(pam_handle_t *pamh, int flags, int argc, const char **argv)
62{
63	login_cap_t *lc;
64	struct options options;
65	struct passwd *pwd;
66	struct stat st;
67	int retval, fd;
68	const char *user, *nologin;
69	char *mtmp;
70
71	pam_std_option(&options, NULL, argc, argv);
72
73	PAM_LOG("Options processed");
74
75	retval = pam_get_user(pamh, &user, NULL);
76	if (retval != PAM_SUCCESS)
77		PAM_RETURN(retval);
78
79	PAM_LOG("Got user: %s", user);
80
81	lc = login_getclass(NULL);
82	nologin = login_getcapstr(lc, "nologin", NOLOGIN, NOLOGIN);
83	login_close(lc);
84	lc = NULL;
85
86	fd = open(nologin, O_RDONLY, 0);
87	if (fd < 0)
88		PAM_RETURN(PAM_SUCCESS);
89
90	PAM_LOG("Opened %s file", NOLOGIN);
91
92	pwd = getpwnam(user);
93	if (pwd && pwd->pw_uid == 0)
94		retval = PAM_SUCCESS;
95	else {
96		if (!pwd)
97			retval = PAM_USER_UNKNOWN;
98		else
99			retval = PAM_AUTH_ERR;
100	}
101
102	if (fstat(fd, &st) < 0)
103		PAM_RETURN(retval);
104
105	mtmp = malloc(st.st_size + 1);
106	if (mtmp != NULL) {
107		read(fd, mtmp, st.st_size);
108		mtmp[st.st_size] = '\0';
109		pam_prompt(pamh, PAM_ERROR_MSG, mtmp, NULL);
110		free(mtmp);
111	}
112
113	if (retval != PAM_SUCCESS)
114		PAM_VERBOSE_ERROR("Administrator refusing you: %s", NOLOGIN);
115
116	PAM_RETURN(retval);
117}
118
119PAM_EXTERN int
120pam_sm_setcred(pam_handle_t *pamh, int flags, int argc, const char **argv)
121{
122	struct options options;
123
124	pam_std_option(&options, NULL, argc, argv);
125
126	PAM_LOG("Options processed");
127
128	PAM_RETURN(PAM_SUCCESS);
129}
130
131PAM_EXTERN int
132pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc ,const char **argv)
133{
134	struct options options;
135
136	pam_std_option(&options, NULL, argc, argv);
137
138	PAM_LOG("Options processed");
139
140	PAM_RETURN(PAM_IGNORE);
141}
142
143PAM_EXTERN int
144pam_sm_chauthtok(pam_handle_t *pamh, int flags, int argc, const char **argv)
145{
146	struct options options;
147
148	pam_std_option(&options, NULL, argc, argv);
149
150	PAM_LOG("Options processed");
151
152	PAM_RETURN(PAM_IGNORE);
153}
154
155PAM_EXTERN int
156pam_sm_open_session(pam_handle_t *pamh, int flags, int argc, const char **argv)
157{
158	struct options options;
159
160	pam_std_option(&options, NULL, argc, argv);
161
162	PAM_LOG("Options processed");
163
164	PAM_RETURN(PAM_IGNORE);
165}
166
167PAM_EXTERN int
168pam_sm_close_session(pam_handle_t *pamh, int flags, int argc, const char **argv)
169{
170	struct options options;
171
172	pam_std_option(&options, NULL, argc, argv);
173
174	PAM_LOG("Options processed");
175
176	PAM_RETURN(PAM_IGNORE);
177}
178
179PAM_MODULE_ENTRY("pam_nologin");
180