lib/libpam/modules/pam_rhosts/pam_rhosts.c

   1 /*      $NetBSD: pam_rhosts.c,v 1.3 2005/03/31 15:11:54 thorpej 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 1.3 2005/03/31 15:11:54 thorpej 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");