diff options
Diffstat (limited to 'lib/libpam/modules/pam_chroot/pam_chroot.c')
-rw-r--r-- | lib/libpam/modules/pam_chroot/pam_chroot.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/lib/libpam/modules/pam_chroot/pam_chroot.c b/lib/libpam/modules/pam_chroot/pam_chroot.c new file mode 100644 index 0000000..447e5f7 --- /dev/null +++ b/lib/libpam/modules/pam_chroot/pam_chroot.c @@ -0,0 +1,109 @@ +/*- + * Copyright (c) 2003 Networks Associates Technology, Inc. + * All rights reserved. + * + * This software was developed for the FreeBSD Project by ThinkSec AS and + * NAI Labs, the Security Research Division of Network Associates, Inc. + * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the + * DARPA CHATS research program. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior written + * permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> + +#include <pwd.h> +#include <stdio.h> +#include <string.h> +#include <unistd.h> + +#define PAM_SM_SESSION + +#include <security/pam_appl.h> +#include <security/pam_modules.h> +#include <security/openpam.h> + +PAM_EXTERN int +pam_sm_open_session(pam_handle_t *pamh, int flags __unused, + int argc __unused, const char *argv[] __unused) +{ + const char *dir, *end, *cwd, *user; + struct passwd *pwd; + char buf[PATH_MAX]; + + if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || + user == NULL || (pwd = getpwnam(user)) == NULL) + return (PAM_SESSION_ERR); + if (pwd->pw_uid == 0 && !openpam_get_option(pamh, "also_root")) + return (PAM_SUCCESS); + if (pwd->pw_dir == NULL) + return (PAM_SESSION_ERR); + if ((end = strstr(pwd->pw_dir, "/./")) != NULL) { + if (snprintf(buf, sizeof(buf), "%.*s", + (int)(end - pwd->pw_dir), pwd->pw_dir) > (int)sizeof(buf)) { + openpam_log(PAM_LOG_ERROR, + "%s's home directory is too long", user); + return (PAM_SESSION_ERR); + } + dir = buf; + cwd = end + 2; + } else if ((dir = openpam_get_option(pamh, "dir")) != NULL) { + if ((cwd = openpam_get_option(pamh, "cwd")) == NULL) + cwd = "/"; + } else { + if (openpam_get_option(pamh, "always")) { + openpam_log(PAM_LOG_ERROR, + "%s has no chroot directory", user); + return (PAM_SESSION_ERR); + } + return (PAM_SUCCESS); + } + + openpam_log(PAM_LOG_DEBUG, "chrooting %s to %s", dir, user); + + if (chroot(dir) == -1) { + openpam_log(PAM_LOG_ERROR, "chroot(): %m"); + return (PAM_SESSION_ERR); + } + if (chdir(cwd) == -1) { + openpam_log(PAM_LOG_ERROR, "chdir(): %m"); + return (PAM_SESSION_ERR); + } + pam_setenv(pamh, "HOME", cwd, 1); + return (PAM_SUCCESS); +} + +PAM_EXTERN int +pam_sm_close_session(pam_handle_t *pamh __unused, int flags __unused, + int argc __unused, const char *argv[] __unused) +{ + + return (PAM_SUCCESS); +} + +PAM_MODULE_ENTRY("pam_chroot"); |