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/* $MidnightBSD$ */ |
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/*- |
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* Copyright (c) 2003 Networks Associates Technology, Inc. |
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* All rights reserved. |
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* |
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* This software was developed for the FreeBSD Project by ThinkSec AS and |
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* NAI Labs, the Security Research Division of Network Associates, Inc. |
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* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the |
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* DARPA CHATS research program. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. The name of the author may not be used to endorse or promote |
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* products derived from this software without specific prior written |
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* permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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|
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#include <sys/cdefs.h> |
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__FBSDID("$FreeBSD: stable/10/lib/libpam/modules/pam_chroot/pam_chroot.c 114262 2003-04-30 00:40:24Z des $"); |
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|
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#include <sys/param.h> |
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|
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#include <pwd.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <unistd.h> |
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|
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#define PAM_SM_SESSION |
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|
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#include <security/pam_appl.h> |
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#include <security/pam_modules.h> |
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#include <security/openpam.h> |
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|
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PAM_EXTERN int |
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pam_sm_open_session(pam_handle_t *pamh, int flags __unused, |
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int argc __unused, const char *argv[] __unused) |
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{ |
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const char *dir, *end, *cwd, *user; |
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struct passwd *pwd; |
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char buf[PATH_MAX]; |
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|
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if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || |
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user == NULL || (pwd = getpwnam(user)) == NULL) |
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return (PAM_SESSION_ERR); |
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if (pwd->pw_uid == 0 && !openpam_get_option(pamh, "also_root")) |
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return (PAM_SUCCESS); |
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if (pwd->pw_dir == NULL) |
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return (PAM_SESSION_ERR); |
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if ((end = strstr(pwd->pw_dir, "/./")) != NULL) { |
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if (snprintf(buf, sizeof(buf), "%.*s", |
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(int)(end - pwd->pw_dir), pwd->pw_dir) > (int)sizeof(buf)) { |
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openpam_log(PAM_LOG_ERROR, |
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"%s's home directory is too long", user); |
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return (PAM_SESSION_ERR); |
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} |
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dir = buf; |
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cwd = end + 2; |
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} else if ((dir = openpam_get_option(pamh, "dir")) != NULL) { |
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if ((cwd = openpam_get_option(pamh, "cwd")) == NULL) |
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cwd = "/"; |
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} else { |
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if (openpam_get_option(pamh, "always")) { |
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openpam_log(PAM_LOG_ERROR, |
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"%s has no chroot directory", user); |
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return (PAM_SESSION_ERR); |
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} |
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return (PAM_SUCCESS); |
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} |
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|
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openpam_log(PAM_LOG_DEBUG, "chrooting %s to %s", dir, user); |
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|
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if (chroot(dir) == -1) { |
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openpam_log(PAM_LOG_ERROR, "chroot(): %m"); |
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return (PAM_SESSION_ERR); |
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} |
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if (chdir(cwd) == -1) { |
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openpam_log(PAM_LOG_ERROR, "chdir(): %m"); |
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return (PAM_SESSION_ERR); |
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} |
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pam_setenv(pamh, "HOME", cwd, 1); |
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return (PAM_SUCCESS); |
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} |
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|
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PAM_EXTERN int |
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pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, |
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int argc __unused, const char *argv[] __unused) |
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{ |
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|
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return (PAM_SUCCESS); |
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} |
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|
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PAM_MODULE_ENTRY("pam_chroot"); |
