lib/pam_module/pam_rhosts/pam_rhosts.c

   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  * $FreeBSD: src/lib/libpam/modules/pam_rhosts/pam_rhosts.c,v 1.3 2003/12/11 13:55:16 des Exp $
  37  */
  38
  39 #include <pwd.h>
  40 #include <stddef.h>
  41 #include <string.h>
  42 #include <unistd.h>
  43
  44 #define PAM_SM_AUTH
  45 #include <security/pam_appl.h>
  46 #include <security/pam_modules.h>
  47 #include <security/pam_mod_misc.h>
  48
  49 #define OPT_ALLOW_ROOT "allow_root"
  50
  51 PAM_EXTERN int
  52 pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
  53                     int argc __unused, const char *argv[] __unused)
  54 {
  55         struct passwd *pw;
  56         const char *user;
  57         const void *ruser, *rhost;
  58         int err, superuser;
  59
  60         err = pam_get_user(pamh, &user, NULL);
  61         if (err != PAM_SUCCESS)
  62                 return (err);
  63
  64         if ((pw = getpwnam(user)) == NULL)
  65                 return (PAM_USER_UNKNOWN);
  66         if (pw->pw_uid == 0 &&
  67             openpam_get_option(pamh, OPT_ALLOW_ROOT) == NULL)
  68                 return (PAM_AUTH_ERR);
  69
  70         err = pam_get_item(pamh, PAM_RUSER, &ruser);
  71         if (err != PAM_SUCCESS)
  72                 return (PAM_AUTH_ERR);
  73
  74         err = pam_get_item(pamh, PAM_RHOST, &rhost);
  75         if (err != PAM_SUCCESS)
  76                 return (PAM_AUTH_ERR);
  77
  78         superuser = (strcmp(user, "root") == 0);
  79         err = ruserok(rhost, superuser, ruser, user);
  80         if (err != 0)
  81                 return (PAM_AUTH_ERR);
  82
  83         return (PAM_SUCCESS);
  84 }
  85
  86 PAM_EXTERN int
  87 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
  88                int argc __unused, const char *argv[] __unused)
  89 {
  90
  91         return (PAM_SUCCESS);
  92 }
  93
  94 PAM_MODULE_ENTRY("pam_rhosts");