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      1 /*	$NetBSD: pam_rhosts.c,v 1.4 2005/04/19 03:15:36 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2002 Danny Braniss
      5  * All rights reserved.
      6  * Copyright (c) 2001,2002 Networks Associates Technology, Inc.
      7  * All rights reserved.
      8  *
      9  * Portions of this software were developed for the FreeBSD Project by
     10  * ThinkSec AS and NAI Labs, the Security Research Division of Network
     11  * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
     12  * ("CBOSS"), as part of the DARPA CHATS research program.
     13  *
     14  * Redistribution and use in source and binary forms, with or without
     15  * modification, are permitted provided that the following conditions
     16  * are met:
     17  * 1. Redistributions of source code must retain the above copyright
     18  *    notice, this list of conditions and the following disclaimer.
     19  * 2. Redistributions in binary form must reproduce the above copyright
     20  *    notice, this list of conditions and the following disclaimer in the
     21  *    documentation and/or other materials provided with the distribution.
     22  * 3. The name of the author may not be used to endorse or promote
     23  *    products derived from this software without specific prior written
     24  *    permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 #ifdef __FreeBSD__
     41 __FBSDID("$FreeBSD: src/lib/libpam/modules/pam_rhosts/pam_rhosts.c,v 1.3 2003/12/11 13:55:16 des Exp $");
     42 #else
     43 __RCSID("$NetBSD: pam_rhosts.c,v 1.4 2005/04/19 03:15:36 christos Exp $");
     44 #endif
     45 
     46 #include <pwd.h>
     47 #include <stddef.h>
     48 #include <string.h>
     49 #include <unistd.h>
     50 
     51 #define PAM_SM_AUTH
     52 #include <security/pam_appl.h>
     53 #include <security/pam_modules.h>
     54 #include <security/pam_mod_misc.h>
     55 
     56 #define OPT_ALLOW_ROOT "allow_root"
     57 
     58 PAM_EXTERN int
     59 pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
     60     int argc __unused, const char *argv[] __unused)
     61 {
     62 	struct passwd *pwd, pwres;
     63 	const char *user;
     64 	const void *ruser, *rhost;
     65 	int err, superuser;
     66 	char pwbuf[1024];
     67 
     68 	err = pam_get_user(pamh, &user, NULL);
     69 	if (err != PAM_SUCCESS)
     70 		return (err);
     71 
     72 	if (getpwnam_r(user, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 ||
     73 	    pwd == NULL)
     74 		return (PAM_USER_UNKNOWN);
     75 	if (pwd->pw_uid == 0 &&
     76 	    openpam_get_option(pamh, OPT_ALLOW_ROOT) == NULL)
     77 		return (PAM_AUTH_ERR);
     78 
     79 	err = pam_get_item(pamh, PAM_RUSER, &ruser);
     80 	if (err != PAM_SUCCESS)
     81 		return (PAM_AUTH_ERR);
     82 
     83 	err = pam_get_item(pamh, PAM_RHOST, &rhost);
     84 	if (err != PAM_SUCCESS)
     85 		return (PAM_AUTH_ERR);
     86 
     87 	superuser = (strcmp(user, "root") == 0);
     88 	err = ruserok(rhost, superuser, ruser, user);
     89 	if (err != 0)
     90 		return (PAM_AUTH_ERR);
     91 
     92 	return (PAM_SUCCESS);
     93 }
     94 
     95 PAM_EXTERN int
     96 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
     97     int argc __unused, const char *argv[] __unused)
     98 {
     99 
    100 	return (PAM_SUCCESS);
    101 }
    102 
    103 PAM_MODULE_ENTRY("pam_rhosts");
    104