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pam_rhosts.c revision 1.1 
      1 /*-
      2  * Copyright (c) 2002 Danny Braniss
      3  * All rights reserved.
      4  * Copyright (c) 2001,2002 Networks Associates Technology, Inc.
      5  * All rights reserved.
      6  *
      7  * Portions of this software were developed for the FreeBSD Project by
      8  * ThinkSec AS and NAI Labs, the Security Research Division of Network
      9  * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
     10  * ("CBOSS"), as part of the DARPA CHATS research program.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 3. The name of the author may not be used to endorse or promote
     21  *    products derived from this software without specific prior written
     22  *    permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 
     37 #include <sys/cdefs.h>
     38 __FBSDID("$FreeBSD: src/lib/libpam/modules/pam_rhosts/pam_rhosts.c,v 1.3 2003/12/11 13:55:16 des Exp $");
     39 
     40 #include <pwd.h>
     41 #include <stddef.h>
     42 #include <string.h>
     43 #include <unistd.h>
     44 
     45 #define PAM_SM_AUTH
     46 #include <security/pam_appl.h>
     47 #include <security/pam_modules.h>
     48 #include <security/pam_mod_misc.h>
     49 
     50 #define OPT_ALLOW_ROOT "allow_root"
     51 
     52 PAM_EXTERN int
     53 pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
     54     int argc __unused, const char *argv[] __unused)
     55 {
     56 	struct passwd *pw;
     57 	const char *user;
     58 	const void *ruser, *rhost;
     59 	int err, superuser;
     60 
     61 	err = pam_get_user(pamh, &user, NULL);
     62 	if (err != PAM_SUCCESS)
     63 		return (err);
     64 
     65 	if ((pw = getpwnam(user)) == NULL)
     66 		return (PAM_USER_UNKNOWN);
     67 	if (pw->pw_uid == 0 &&
     68 	    openpam_get_option(pamh, OPT_ALLOW_ROOT) == NULL)
     69 		return (PAM_AUTH_ERR);
     70 
     71 	err = pam_get_item(pamh, PAM_RUSER, &ruser);
     72 	if (err != PAM_SUCCESS)
     73 		return (PAM_AUTH_ERR);
     74 
     75 	err = pam_get_item(pamh, PAM_RHOST, &rhost);
     76 	if (err != PAM_SUCCESS)
     77 		return (PAM_AUTH_ERR);
     78 
     79 	superuser = (strcmp(user, "root") == 0);
     80 	err = ruserok(rhost, superuser, ruser, user);
     81 	if (err != 0)
     82 		return (PAM_AUTH_ERR);
     83 
     84 	return (PAM_SUCCESS);
     85 }
     86 
     87 PAM_EXTERN int
     88 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
     89     int argc __unused, const char *argv[] __unused)
     90 {
     91 
     92 	return (PAM_SUCCESS);
     93 }
     94 
     95 PAM_MODULE_ENTRY("pam_rhosts");
     96