2 * Copyright (c) 2003 Networks Associates Technology, Inc.
5 * This software was developed for the FreeBSD Project by ThinkSec AS and
6 * NAI Labs, the Security Research Division of Network Associates, Inc.
7 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
8 * DARPA CHATS research program.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote
19 * products derived from this software without specific prior written
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
38 #include <sys/param.h>
45 #define PAM_SM_SESSION
47 #include <security/pam_appl.h>
48 #include <security/pam_modules.h>
49 #include <security/openpam.h>
52 pam_sm_open_session(pam_handle_t *pamh, int flags __unused,
53 int argc __unused, const char *argv[] __unused)
55 const char *dir, *end, *cwd, *user;
59 if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS ||
60 user == NULL || (pwd = getpwnam(user)) == NULL)
61 return (PAM_SESSION_ERR);
62 if (pwd->pw_uid == 0 && !openpam_get_option(pamh, "also_root"))
64 if (pwd->pw_dir == NULL)
65 return (PAM_SESSION_ERR);
66 if ((end = strstr(pwd->pw_dir, "/./")) != NULL) {
67 if (snprintf(buf, sizeof(buf), "%.*s",
68 (int)(end - pwd->pw_dir), pwd->pw_dir) > (int)sizeof(buf)) {
69 openpam_log(PAM_LOG_ERROR,
70 "%s's home directory is too long", user);
71 return (PAM_SESSION_ERR);
75 } else if ((dir = openpam_get_option(pamh, "dir")) != NULL) {
76 if ((cwd = openpam_get_option(pamh, "cwd")) == NULL)
79 if (openpam_get_option(pamh, "always")) {
80 openpam_log(PAM_LOG_ERROR,
81 "%s has no chroot directory", user);
82 return (PAM_SESSION_ERR);
87 openpam_log(PAM_LOG_DEBUG, "chrooting %s to %s", dir, user);
89 if (chroot(dir) == -1) {
90 openpam_log(PAM_LOG_ERROR, "chroot(): %m");
91 return (PAM_SESSION_ERR);
93 if (chdir(cwd) == -1) {
94 openpam_log(PAM_LOG_ERROR, "chdir(): %m");
95 return (PAM_SESSION_ERR);
97 pam_setenv(pamh, "HOME", cwd, 1);
102 pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused,
103 int argc __unused, const char *argv[] __unused)
106 return (PAM_SUCCESS);
109 PAM_MODULE_ENTRY("pam_chroot");