lib/pam_module/pam_login_access/pam_login_access.c

   1 /*-
   2  * Copyright (c) 2001 Mark R V Murray
   3  * All rights reserved.
   4  * Copyright (c) 2001 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_login_access/pam_login_access.c,v 1.11 2004/02/10 10:13:21 des Exp $
  37  */
  38
  39 #define _BSD_SOURCE
  40
  41 #include <sys/param.h>
  42
  43 #include <syslog.h>
  44 #include <unistd.h>
  45
  46 #define PAM_SM_ACCOUNT
  47
  48 #include <security/pam_appl.h>
  49 #include <security/pam_modules.h>
  50 #include <security/pam_mod_misc.h>
  51
  52 #include "pam_login_access.h"
  53
  54 PAM_EXTERN int
  55 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused,
  56                  int argc __unused, const char *argv[] __unused)
  57 {
  58         const void *rhost, *tty, *user;
  59         char hostname[MAXHOSTNAMELEN];
  60         int pam_err;
  61
  62         pam_err = pam_get_item(pamh, PAM_USER, &user);
  63         if (pam_err != PAM_SUCCESS)
  64                 return (pam_err);
  65
  66         if (user == NULL)
  67                 return (PAM_SERVICE_ERR);
  68
  69         PAM_LOG("Got user: %s", (const char *)user);
  70
  71         pam_err = pam_get_item(pamh, PAM_RHOST, &rhost);
  72         if (pam_err != PAM_SUCCESS)
  73                 return (pam_err);
  74
  75         pam_err = pam_get_item(pamh, PAM_TTY, &tty);
  76         if (pam_err != PAM_SUCCESS)
  77                 return (pam_err);
  78
  79         gethostname(hostname, sizeof hostname);
  80
  81         if (rhost == NULL || *(const char *)rhost == '\0') {
  82                 PAM_LOG("Checking login.access for user %s on tty %s",
  83                     (const char *)user, (const char *)tty);
  84                 if (login_access(user, tty) != 0)
  85                         return (PAM_SUCCESS);
  86                 PAM_VERBOSE_ERROR("%s is not allowed to log in on %s",
  87                     user, tty);
  88         } else {
  89                 PAM_LOG("Checking login.access for user %s from host %s",
  90                     (const char *)user, (const char *)rhost);
  91                 if (login_access(user, rhost) != 0)
  92                         return (PAM_SUCCESS);
  93                 PAM_VERBOSE_ERROR("%s is not allowed to log in from %s",
  94                     user, rhost);
  95         }
  96
  97         return (PAM_AUTH_ERR);
  98 }
  99
 100 PAM_MODULE_ENTRY("pam_login_access");