lib/libpam/modules/pam_login_access/pam_login_access.c

   1 /*      $NetBSD: pam_login_access.c,v 1.2 2004/12/12 08:18:46 christos Exp $    */
   2
   3 /*-
   4  * Copyright (c) 2001 Mark R V Murray
   5  * All rights reserved.
   6  * Copyright (c) 2001 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_login_access/pam_login_access.c,v 1.11 2004/02/10 10:13:21 des Exp $");
  42 #else
  43 __RCSID("$NetBSD: pam_login_access.c,v 1.2 2004/12/12 08:18:46 christos Exp $");
  44 #endif
  45
  46 #define _BSD_SOURCE
  47
  48 #include <sys/param.h>
  49
  50 #include <unistd.h>
  51
  52 #define PAM_SM_ACCOUNT
  53
  54 #include <security/pam_appl.h>
  55 #include <security/pam_modules.h>
  56 #include <security/pam_mod_misc.h>
  57
  58 #include "pam_login_access.h"
  59
  60 PAM_EXTERN int
  61 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused,
  62     int argc __unused, const char *argv[] __unused)
  63 {
  64         const void *rhost, *tty, *user;
  65         char hostname[MAXHOSTNAMELEN];
  66         int pam_err;
  67
  68         pam_err = pam_get_item(pamh, PAM_USER, &user);
  69         if (pam_err != PAM_SUCCESS)
  70                 return (pam_err);
  71
  72         if (user == NULL)
  73                 return (PAM_SERVICE_ERR);
  74
  75         PAM_LOG("Got user: %s", (const char *)user);
  76
  77         pam_err = pam_get_item(pamh, PAM_RHOST, &rhost);
  78         if (pam_err != PAM_SUCCESS)
  79                 return (pam_err);
  80
  81         pam_err = pam_get_item(pamh, PAM_TTY, &tty);
  82         if (pam_err != PAM_SUCCESS)
  83                 return (pam_err);
  84
  85         gethostname(hostname, sizeof hostname);
  86
  87         if (rhost == NULL || *(const char *)rhost == '\0') {
  88                 PAM_LOG("Checking login.access for user %s on tty %s",
  89                     (const char *)user, (const char *)tty);
  90                 if (login_access(user, tty) != 0)
  91                         return (PAM_SUCCESS);
  92                 PAM_VERBOSE_ERROR("%s is not allowed to log in on %s",
  93                     user, tty);
  94         } else {
  95                 PAM_LOG("Checking login.access for user %s from host %s",
  96                     (const char *)user, (const char *)rhost);
  97                 if (login_access(user, rhost) != 0)
  98                         return (PAM_SUCCESS);
  99                 PAM_VERBOSE_ERROR("%s is not allowed to log in from %s",
 100                     user, rhost);
 101         }
 102
 103         return (PAM_AUTH_ERR);
 104 }
 105
 106 PAM_MODULE_ENTRY("pam_login_access");