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pam_group.c revision 1.1 
      1 /*-
      2  * Copyright (c) 2003 Networks Associates Technology, Inc.
      3  * All rights reserved.
      4  *
      5  * Portions of this software were developed for the FreeBSD Project by
      6  * ThinkSec AS and NAI Labs, the Security Research Division of Network
      7  * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
      8  * ("CBOSS"), as part of the DARPA CHATS research program.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. The name of the author may not be used to endorse or promote
     19  *    products derived from this software without specific prior written
     20  *    permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #include <sys/cdefs.h>
     36 __FBSDID("$FreeBSD: src/lib/libpam/modules/pam_group/pam_group.c,v 1.4 2003/12/11 13:55:15 des Exp $");
     37 
     38 #include <sys/types.h>
     39 
     40 #include <grp.h>
     41 #include <pwd.h>
     42 #include <stdarg.h>
     43 #include <stdio.h>
     44 #include <string.h>
     45 #include <syslog.h>
     46 #include <unistd.h>
     47 
     48 #define PAM_SM_AUTH
     49 
     50 #include <security/pam_appl.h>
     51 #include <security/pam_modules.h>
     52 #include <security/openpam.h>
     53 
     54 
     55 PAM_EXTERN int
     56 pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
     57     int argc __unused, const char *argv[] __unused)
     58 {
     59 	const char *group, *user;
     60 	const void *ruser;
     61 	char *const *list;
     62 	struct passwd *pwd;
     63 	struct group *grp;
     64 
     65 	/* get target account */
     66 	if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS ||
     67 	    user == NULL || (pwd = getpwnam(user)) == NULL)
     68 		return (PAM_AUTH_ERR);
     69 	if (pwd->pw_uid != 0 && openpam_get_option(pamh, "root_only"))
     70 		return (PAM_IGNORE);
     71 
     72 	/* get applicant */
     73 	if (pam_get_item(pamh, PAM_RUSER, &ruser) != PAM_SUCCESS
     74 	    || ruser == NULL || (pwd = getpwnam(ruser)) == NULL)
     75 		return (PAM_AUTH_ERR);
     76 
     77 	/* get regulating group */
     78 	if ((group = openpam_get_option(pamh, "group")) == NULL)
     79 		group = "wheel";
     80 	if ((grp = getgrnam(group)) == NULL || grp->gr_mem == NULL)
     81 		goto failed;
     82 
     83 	/* check if the group is empty */
     84 	if (*grp->gr_mem == NULL)
     85 		goto failed;
     86 
     87 	/* check membership */
     88 	if (pwd->pw_gid == grp->gr_gid)
     89 		goto found;
     90 	for (list = grp->gr_mem; *list != NULL; ++list)
     91 		if (strcmp(*list, pwd->pw_name) == 0)
     92 			goto found;
     93 
     94  not_found:
     95 	if (openpam_get_option(pamh, "deny"))
     96 		return (PAM_SUCCESS);
     97 	return (PAM_AUTH_ERR);
     98  found:
     99 	if (openpam_get_option(pamh, "deny"))
    100 		return (PAM_AUTH_ERR);
    101 	return (PAM_SUCCESS);
    102  failed:
    103 	if (openpam_get_option(pamh, "fail_safe"))
    104 		goto found;
    105 	else
    106 		goto not_found;
    107 }
    108 
    109 PAM_EXTERN int
    110 pam_sm_setcred(pam_handle_t * pamh __unused, int flags __unused,
    111     int argc __unused, const char *argv[] __unused)
    112 {
    113 
    114 	return (PAM_SUCCESS);
    115 }
    116 
    117 PAM_MODULE_ENTRY("pam_group");
    118