147 lines
4.4 KiB
C
147 lines
4.4 KiB
C
/*-
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* Copyright (c) 2003 Networks Associates Technology, Inc.
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* Copyright (c) 2004-2011 Dag-Erling Smørgrav
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* All rights reserved.
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*
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* Portions of this software were developed for the FreeBSD Project by
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* ThinkSec AS and NAI Labs, the Security Research Division of Network
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* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
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* ("CBOSS"), as part of the 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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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <grp.h>
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#include <pwd.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#define PAM_SM_AUTH
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#define PAM_SM_ACCOUNT
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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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static int
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pam_group(pam_handle_t *pamh)
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{
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int local, remote;
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const char *group, *user;
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const void *ruser;
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char *const *list;
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struct passwd *pwd;
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struct group *grp;
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/* get target account */
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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_AUTH_ERR);
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if (pwd->pw_uid != 0 && openpam_get_option(pamh, "root_only"))
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return (PAM_IGNORE);
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/* check local / remote */
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local = openpam_get_option(pamh, "luser") ? 1 : 0;
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remote = openpam_get_option(pamh, "ruser") ? 1 : 0;
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if (local && remote) {
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openpam_log(PAM_LOG_ERROR, "(pam_group) "
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"the luser and ruser options are mutually exclusive");
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return (PAM_SERVICE_ERR);
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} else if (local) {
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/* we already have the correct struct passwd */
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} else {
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if (!remote)
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openpam_log(PAM_LOG_NOTICE, "(pam_group) "
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"neither luser nor ruser specified, assuming ruser");
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/* default / historical behavior */
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if (pam_get_item(pamh, PAM_RUSER, &ruser) != PAM_SUCCESS ||
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ruser == NULL || (pwd = getpwnam(ruser)) == NULL)
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return (PAM_AUTH_ERR);
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}
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/* get regulating group */
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if ((group = openpam_get_option(pamh, "group")) == NULL)
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group = "wheel";
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if ((grp = getgrnam(group)) == NULL || grp->gr_mem == NULL)
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goto failed;
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/* check if user's own primary group */
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if (pwd->pw_gid == grp->gr_gid)
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goto found;
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/* iterate over members */
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for (list = grp->gr_mem; list != NULL && *list != NULL; ++list)
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if (strcmp(*list, pwd->pw_name) == 0)
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goto found;
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not_found:
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if (openpam_get_option(pamh, "deny"))
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return (PAM_SUCCESS);
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return (PAM_AUTH_ERR);
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found:
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if (openpam_get_option(pamh, "deny"))
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return (PAM_AUTH_ERR);
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return (PAM_SUCCESS);
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failed:
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if (openpam_get_option(pamh, "fail_safe"))
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goto found;
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else
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goto not_found;
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}
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PAM_EXTERN int
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pam_sm_authenticate(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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return (pam_group(pamh));
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}
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PAM_EXTERN int
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pam_sm_setcred(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_EXTERN int
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pam_sm_acct_mgmt(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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return (pam_group(pamh));
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}
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PAM_MODULE_ENTRY("pam_group");
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