/*      $NetBSD: pam_rhosts.c,v 1.4 2005/04/19 03:15:36 christos Exp $  */

/*-
* Copyright (c) 2002 Danny Braniss
* All rights reserved.
* Copyright (c) 2001,2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* Portions of this software were 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>
#ifdef __FreeBSD__
__FBSDID("$FreeBSD: src/lib/libpam/modules/pam_rhosts/pam_rhosts.c,v 1.3 2003/12/11 13:55:16 des Exp $");
#else
__RCSID("$NetBSD: pam_rhosts.c,v 1.4 2005/04/19 03:15:36 christos Exp $");
#endif

#include <pwd.h>
#include <stddef.h>
#include <string.h>
#include <unistd.h>

#define PAM_SM_AUTH
#include <security/pam_appl.h>
#include <security/pam_modules.h>
#include <security/pam_mod_misc.h>

#define OPT_ALLOW_ROOT "allow_root"

PAM_EXTERN int
pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
   int argc __unused, const char *argv[] __unused)
{
       struct passwd *pwd, pwres;
       const char *user;
       const void *ruser, *rhost;
       int err, superuser;
       char pwbuf[1024];

       err = pam_get_user(pamh, &user, NULL);
       if (err != PAM_SUCCESS)
               return (err);

       if (getpwnam_r(user, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 ||
           pwd == NULL)
               return (PAM_USER_UNKNOWN);
       if (pwd->pw_uid == 0 &&
           openpam_get_option(pamh, OPT_ALLOW_ROOT) == NULL)
               return (PAM_AUTH_ERR);

       err = pam_get_item(pamh, PAM_RUSER, &ruser);
       if (err != PAM_SUCCESS)
               return (PAM_AUTH_ERR);

       err = pam_get_item(pamh, PAM_RHOST, &rhost);
       if (err != PAM_SUCCESS)
               return (PAM_AUTH_ERR);

       superuser = (strcmp(user, "root") == 0);
       err = ruserok(rhost, superuser, ruser, user);
       if (err != 0)
               return (PAM_AUTH_ERR);

       return (PAM_SUCCESS);
}

PAM_EXTERN int
pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
   int argc __unused, const char *argv[] __unused)
{

       return (PAM_SUCCESS);
}

PAM_MODULE_ENTRY("pam_rhosts");