172613Skris/*- 272613Skris * Copyright (c) 2003 Networks Associates Technology, Inc. 372613Skris * All rights reserved. 472613Skris * 572613Skris * This software was developed for the FreeBSD Project by ThinkSec AS and 672613Skris * NAI Labs, the Security Research Division of Network Associates, Inc. 772613Skris * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 872613Skris * DARPA CHATS research program. 972613Skris * 1072613Skris * Redistribution and use in source and binary forms, with or without 1172613Skris * modification, are permitted provided that the following conditions 1272613Skris * are met: 1372613Skris * 1. Redistributions of source code must retain the above copyright 1472613Skris * notice, this list of conditions and the following disclaimer. 1572613Skris * 2. Redistributions in binary form must reproduce the above copyright 1672613Skris * notice, this list of conditions and the following disclaimer in the 1772613Skris * documentation and/or other materials provided with the distribution. 1872613Skris * 3. The name of the author may not be used to endorse or promote 1972613Skris * products derived from this software without specific prior written 2072613Skris * permission. 2172613Skris * 2272613Skris * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 2372613Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2472613Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2572613Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 2672613Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2772613Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2872613Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2972613Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3072613Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3172613Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3272613Skris * SUCH DAMAGE. 3372613Skris */ 3472613Skris 3572613Skris#include <sys/cdefs.h> 3672613Skris__FBSDID("$FreeBSD$"); 3772613Skris 3872613Skris#include <sys/param.h> 3972613Skris 4072613Skris#include <pwd.h> 4172613Skris#include <stdio.h> 4272613Skris#include <string.h> 4372613Skris#include <unistd.h> 4472613Skris 4572613Skris#define PAM_SM_SESSION 4672613Skris 4772613Skris#include <security/pam_appl.h> 4872613Skris#include <security/pam_modules.h> 4972613Skris#include <security/openpam.h> 5072613Skris 5172613SkrisPAM_EXTERN int 5272613Skrispam_sm_open_session(pam_handle_t *pamh, int flags __unused, 5372613Skris int argc __unused, const char *argv[] __unused) 5472613Skris{ 5572613Skris const char *dir, *end, *cwd, *user; 5672613Skris struct passwd *pwd; 5772613Skris char buf[PATH_MAX]; 5879998Skris 5979998Skris if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || 6079998Skris user == NULL || (pwd = getpwnam(user)) == NULL) 6189837Skris return (PAM_SESSION_ERR); 6279998Skris if (pwd->pw_uid == 0 && !openpam_get_option(pamh, "also_root")) 6379998Skris return (PAM_SUCCESS); 6479998Skris if (pwd->pw_dir == NULL) 6572613Skris return (PAM_SESSION_ERR); 6672613Skris if ((end = strstr(pwd->pw_dir, "/./")) != NULL) { 6776866Skris if (snprintf(buf, sizeof(buf), "%.*s", 6872613Skris (int)(end - pwd->pw_dir), pwd->pw_dir) > (int)sizeof(buf)) { 6972613Skris openpam_log(PAM_LOG_ERROR, 7072613Skris "%s's home directory is too long", user); 7172613Skris return (PAM_SESSION_ERR); 7272613Skris } 7372613Skris dir = buf; 7472613Skris cwd = end + 2; 7572613Skris } else if ((dir = openpam_get_option(pamh, "dir")) != NULL) { 7672613Skris if ((cwd = openpam_get_option(pamh, "cwd")) == NULL) 7772613Skris cwd = "/"; 7872613Skris } else { 7972613Skris if (openpam_get_option(pamh, "always")) { 8072613Skris openpam_log(PAM_LOG_ERROR, 8172613Skris "%s has no chroot directory", user); 8272613Skris return (PAM_SESSION_ERR); 8372613Skris } 8472613Skris return (PAM_SUCCESS); 8572613Skris } 8672613Skris 8772613Skris openpam_log(PAM_LOG_DEBUG, "chrooting %s to %s", dir, user); 8872613Skris 8972613Skris if (chroot(dir) == -1) { 9072613Skris openpam_log(PAM_LOG_ERROR, "chroot(): %m"); 9172613Skris return (PAM_SESSION_ERR); 9272613Skris } 9372613Skris if (chdir(cwd) == -1) { 9472613Skris openpam_log(PAM_LOG_ERROR, "chdir(): %m"); 9572613Skris return (PAM_SESSION_ERR); 9672613Skris } 9772613Skris pam_setenv(pamh, "HOME", cwd, 1); 9872613Skris return (PAM_SUCCESS); 9972613Skris} 10072613Skris 10172613SkrisPAM_EXTERN int 10272613Skrispam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, 103264331Sjkim int argc __unused, const char *argv[] __unused) 10472613Skris{ 10572613Skris 10672613Skris return (PAM_SUCCESS); 10772613Skris} 10872613Skris 109264331SjkimPAM_MODULE_ENTRY("pam_chroot"); 11072613Skris