2 * Copyright 2001 Mark R V Murray
4 * Copyright (c) 2001 Networks Associates Technology, Inc.
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.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
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
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
36 * $FreeBSD: src/lib/libpam/modules/pam_nologin/pam_nologin.c,v 1.13 2007/06/14 13:07:06 yar Exp $
39 #include <sys/types.h>
42 #include <login_cap.h>
48 #define PAM_SM_ACCOUNT
50 #include <security/pam_appl.h>
51 #include <security/pam_modules.h>
52 #include <security/pam_mod_misc.h>
54 #define _PATH_NOLOGIN "/var/run/nologin"
56 static char nologin_def[] = _PATH_NOLOGIN;
59 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
60 int argc __unused, const char *argv[] __unused)
67 const char *user, *nologin;
70 retval = pam_get_user(pamh, &user, NULL);
71 if (retval != PAM_SUCCESS)
74 PAM_LOG("Got user: %s", user);
78 return (PAM_USER_UNKNOWN);
81 * login_getpwclass(3) will select the "root" class by default
82 * if pwd->pw_uid is 0. That class should have "ignorenologin"
83 * capability so that super-user can bypass nologin.
85 lc = login_getpwclass(pwd);
87 PAM_LOG("Unable to get login class for user %s", user);
88 return (PAM_SERVICE_ERR);
91 if (login_getcapbool(lc, "ignorenologin", 0)) {
96 nologin = login_getcapstr(lc, "nologin", nologin_def, nologin_def);
98 fd = open(nologin, O_RDONLY, 0);
101 return (PAM_SUCCESS);
104 PAM_LOG("Opened %s file", nologin);
106 if (fstat(fd, &st) == 0) {
107 mtmp = malloc(st.st_size + 1);
109 ss = read(fd, mtmp, st.st_size);
112 pam_error(pamh, "%s", mtmp);
118 PAM_VERBOSE_ERROR("Administrator refusing you: %s", nologin);
123 return (PAM_AUTH_ERR);
126 PAM_MODULE_ENTRY("pam_nologin");