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<?php
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/* $Id$ */
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/*
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Copyright (C) 2005 Bill Marquette <bill.marquette@gmail.com>
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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require_once("config.inc");
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require_once("globals.inc");
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/* We only support file backed HTTP Basic auth right now */
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$auth_method="htpasswd_backed_basic_auth";
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/* Authenticate user - exit if failed (we should have a callback for this maybe) */
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if (!$auth_method())
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exit;
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function basic_auth_prompt(){
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header("WWW-Authenticate: Basic realm=\".\"");
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header("HTTP/1.0 401 Unauthorized");
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echo "You must enter valid credentials to access this resource.";
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exit;
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}
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function passwd_backed_basic_auth() {
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global $HTTP_SERVER_VARS;
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$authfile = file("/etc/master.passwd");
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/* Prompt three times and give up */
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for($attempt = 0; $attempt <= 3; basic_auth_prompt()){
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$attempt++;
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/* Check for AUTH_USER */
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if ($HTTP_SERVER_VARS['PHP_AUTH_USER'] <> "") {
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$HTTP_SERVER_VARS['AUTH_USER'] = $HTTP_SERVER_VARS['PHP_AUTH_USER'];
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$HTTP_SERVER_VARS['AUTH_PW'] = $HTTP_SERVER_VARS['PHP_AUTH_PW'];
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}
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if (!isset($HTTP_SERVER_VARS['AUTH_USER']))
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continue;
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/* Check to see if user even exists */
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$username = $HTTP_SERVER_VARS['AUTH_USER'];
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if(!($line = array_shift(preg_grep("/^$username:.*$/", $authfile))))
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continue;
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/* Get crypted password */
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preg_match("/^$username:((\\$1\\$[.\d\w_\/]{8}\\$)[.\d\w_\/]{22})$/", $line, $matches);
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$pass = $matches[1];
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$salt = $matches[2];
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/* Encrypt entered password with salt */
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$authpass = crypt($HTTP_SERVER_VARS['AUTH_PW'], $salt);
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/* And finally validate password */
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if($authpass == $pass)
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return true;
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else
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continue;
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}
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/* Should only get here if user fails login three times */
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return false;
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}
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function htpasswd_backed_basic_auth() {
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global $HTTP_SERVER_VARS;
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$authfile = file("/var/run/htpasswd");
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/* sanity check to ensure that /usr/local/www/.htpasswd doesn't exist */
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unlink_if_exists("/usr/local/www/.htpasswd");
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/* Prompt three times and give up */
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for($attempt = 0; $attempt <= 3; basic_auth_prompt()){
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$attempt++;
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/* Check for AUTH_USER */
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if ($HTTP_SERVER_VARS['PHP_AUTH_USER'] <> "") {
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$HTTP_SERVER_VARS['AUTH_USER'] = $HTTP_SERVER_VARS['PHP_AUTH_USER'];
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$HTTP_SERVER_VARS['AUTH_PW'] = $HTTP_SERVER_VARS['PHP_AUTH_PW'];
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}
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if (!isset($HTTP_SERVER_VARS['AUTH_USER']))
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continue;
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/* Check to see if user even exists */
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$username = $HTTP_SERVER_VARS['AUTH_USER'];
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if(!($line = array_shift(preg_grep("/^$username:.*$/", $authfile))))
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continue;
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/* Get crypted password */
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preg_match("/^$username:((\\$1\\$[.\d\w_\/]{8}\\$)[.\d\w_\/]{22})$/", $line, $matches);
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$pass = $matches[1];
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$salt = $matches[2];
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/* Encrypt entered password with salt */
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$authpass = crypt($HTTP_SERVER_VARS['AUTH_PW'], $salt);
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/* And finally validate password */
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if($authpass == $pass)
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return true;
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else
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continue;
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}
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/* Should only get here if user fails login three times */
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return false;
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}
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?>
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