119 lines
3.9 KiB
C
119 lines
3.9 KiB
C
/* $NetBSD: pam_chroot.c,v 1.4 2005/04/19 03:15:34 christos Exp $ */
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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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#include <sys/cdefs.h>
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#ifdef __FreeBSD__
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__FBSDID("$FreeBSD: src/lib/libpam/modules/pam_chroot/pam_chroot.c,v 1.3 2003/04/30 00:40:24 des Exp $");
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#else
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__RCSID("$NetBSD: pam_chroot.c,v 1.4 2005/04/19 03:15:34 christos Exp $");
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#endif
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#include <sys/param.h>
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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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#define PAM_SM_SESSION
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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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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, pwres;
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char buf[PATH_MAX];
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char pwbuf[1024];
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if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS ||
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user == NULL ||
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getpwnam_r(user, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 ||
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pwd == 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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openpam_log(PAM_LOG_DEBUG, "chrooting %s to %s", dir, user);
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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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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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return (PAM_SUCCESS);
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}
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PAM_MODULE_ENTRY("pam_chroot");
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