130 lines
3.7 KiB
PHP
130 lines
3.7 KiB
PHP
<?php
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// $Header: /cvsroot/phpldapadmin/phpldapadmin/lib/session_functions.php,v 1.18 2007/12/15 07:50:33 wurley Exp $
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/**
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* A collection of functions to handle sessions throughout phpLDAPadmin.
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* @author The phpLDAPadmin development team
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* @package phpLDAPadmin
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*/
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/** The session ID that phpLDAPadmin will use for all sessions */
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define('PLA_SESSION_ID','PLASESSID');
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/** Enables session paranoia, which causes SIDs to change each page load (EXPERIMENTAL!) */
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define('pla_session_id_paranoid', false);
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/** Flag to indicate whether the session has already been initialized (this constant gets stored in $_SESSION) */
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define('pla_session_id_init', 'pla_initialized');
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/** The minimum first char value IP in hex for IP hashing. */
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define('pla_session_id_ip_min', 8);
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/** The maximum first char value of the IP in hex for IP hashing. */
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define('pla_session_id_ses_max', 36);
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/**
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* Creates a new session id, which includes an IP hash.
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*
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* @return string the new session ID string
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*/
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function pla_session_get_id() {
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if (DEBUG_ENABLED)
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debug_log('pla_session_get_id(): Entered with ()',1);
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$id_md5 = md5(rand(1,1000000));
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$ip_md5 = md5($_SERVER['REMOTE_ADDR']);
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$id_hex = hexdec($id_md5[0]) + 1;
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$ip_hex = hexdec($ip_md5[0]);
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if ($ip_hex <= pla_session_id_ip_min)
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$ip_len = pla_session_id_ip_min;
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else
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$ip_len = $ip_hex - 1;
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$new_id = substr($id_md5, 0, $id_hex) .
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substr($ip_md5, $ip_hex, $ip_len) .
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substr($id_md5, $id_hex, pla_session_id_ses_max - ($id_hex + $ip_len));
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return $new_id;
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}
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/**
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* Checks if the session belongs to an IP
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*
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* @return bool True, if the session is valid
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*/
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function pla_session_verify_id() {
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if (DEBUG_ENABLED)
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debug_log('pla_session_verify_id(): Entered with ()',1);
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$check_id = session_id();
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$ip_md5 = md5($_SERVER['REMOTE_ADDR']);
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$id_hex = hexdec($check_id[0]) + 1;
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$ip_hex = hexdec($ip_md5[0]);
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if ($ip_hex <= pla_session_id_ip_min)
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$ip_len = pla_session_id_ip_min;
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else
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$ip_len = $ip_hex - 1;
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$ip_ses = substr($check_id, $id_hex, $ip_len);
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$ip_ver = substr($ip_md5, $ip_hex, $ip_len);
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return ($ip_ses == $ip_ver);
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}
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function pla_session_param() {
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/* If cookies were disabled, build the url parameter for the session id.
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It will be append to the url to be redirect */
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return (SID != '') ? sprintf('&%s=%s',session_name(),session_id()) : '';
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}
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/**
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* The only function which should be called by a user
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*
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* @see common.php
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* @see PLA_SESSION_ID
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* @return bool Returns true if the session was started the first time
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*/
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function pla_session_start() {
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/* If session.auto_start is on in the server's PHP configuration (php.ini), then
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* we will have problems loading our schema cache since the session will have started
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* prior to loading the SchemaItem (and descedants) class. Destroy the auto-started
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* session to prevent this problem.
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*/
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if (ini_get('session.auto_start'))
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@session_destroy();
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# Do we already have a session?
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if (@session_id())
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die;
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@session_name(PLA_SESSION_ID);
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@session_start();
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# Do we have a valid session?
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$is_initialized = is_array($_SESSION) && array_key_exists(pla_session_id_init,$_SESSION);
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if (! $is_initialized) {
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if (pla_session_id_paranoid) {
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ini_set('session.use_trans_sid',0);
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@session_destroy();
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@session_id(pla_session_get_id());
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@session_start();
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ini_set('session.use_trans_sid',1);
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}
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$_SESSION[pla_session_id_init]['version'] = pla_version();
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$_SESSION[pla_session_id_init]['config'] = filemtime(CONFDIR.'config.php');
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}
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@header('Cache-control: private'); // IE 6 Fix
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if (pla_session_id_paranoid && ! pla_session_verify_id())
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pla_error('Session inconsistent or session timeout');
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return (! $is_initialized) ? true : false;
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}
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/**
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* Stops the current session.
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*/
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function pla_session_close() {
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@session_write_close();
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}
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?>
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