lib/libpam/modules/pam_login_access/pam_login_access.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   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  * $FreeBSD: head/lib/libpam/modules/pam_login_access/pam_login_access.c 326219 2017-11-26 02:00:33Z pfg $
  39  */
  40
  41 #define _BSD_SOURCE
  42
  43 #include <sys/param.h>
  44
  45 #include <syslog.h>
  46 #include <unistd.h>
  47
  48 #define PAM_SM_ACCOUNT
  49
  50 #include <security/pam_appl.h>
  51 #include <security/pam_modules.h>
  52 #include <security/pam_mod_misc.h>
  53
  54 #include "pam_login_access.h"
  55
  56 PAM_EXTERN int
  57 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags __unused,
  58     int argc __unused, const char *argv[] __unused)
  59 {
  60         const void *rhost, *tty, *user;
  61         char hostname[MAXHOSTNAMELEN];
  62         int pam_err;
  63
  64         pam_err = pam_get_item(pamh, PAM_USER, &user);
  65         if (pam_err != PAM_SUCCESS)
  66                 return (pam_err);
  67
  68         if (user == NULL)
  69                 return (PAM_SERVICE_ERR);
  70
  71         PAM_LOG("Got user: %s", (const char *)user);
  72
  73         pam_err = pam_get_item(pamh, PAM_RHOST, &rhost);
  74         if (pam_err != PAM_SUCCESS)
  75                 return (pam_err);
  76
  77         pam_err = pam_get_item(pamh, PAM_TTY, &tty);
  78         if (pam_err != PAM_SUCCESS)
  79                 return (pam_err);
  80
  81         gethostname(hostname, sizeof hostname);
  82
  83         if (rhost != NULL && *(const char *)rhost != '\0') {
  84                 PAM_LOG("Checking login.access for user %s from host %s",
  85                     (const char *)user, (const char *)rhost);
  86                 if (login_access(user, rhost) != 0)
  87                         return (PAM_SUCCESS);
  88                 PAM_VERBOSE_ERROR("%s is not allowed to log in from %s",
  89                     (const char *)user, (const char *)rhost);
  90         } else if (tty != NULL && *(const char *)tty != '\0') {
  91                 PAM_LOG("Checking login.access for user %s on tty %s",
  92                     (const char *)user, (const char *)tty);
  93                 if (login_access(user, tty) != 0)
  94                         return (PAM_SUCCESS);
  95                 PAM_VERBOSE_ERROR("%s is not allowed to log in on %s",
  96                     (const char *)user, (const char *)tty);
  97         } else {
  98                 PAM_LOG("Checking login.access for user %s",
  99                     (const char *)user);
 100                 if (login_access(user, "***unknown***") != 0)
 101                         return (PAM_SUCCESS);
 102                 PAM_VERBOSE_ERROR("%s is not allowed to log in",
 103                     (const char *)user);
 104         }
 105
 106         return (PAM_AUTH_ERR);
 107 }
 108
 109 PAM_MODULE_ENTRY("pam_login_access");