121 lines
3.5 KiB
PHP
121 lines
3.5 KiB
PHP
<?php
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// $Header: /cvsroot/phpldapadmin/phpldapadmin/session_functions.php,v 1.14 2005/07/16 03:13:54 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 $_SESSION) */
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define('pla_session_id_init', 'pla_initialized');
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/** The minimum first char value IP in hex for IP hashing. */
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define('pla_session_id_ip_min', 8);
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/** The maximum first char value of the IP in hex for IP hashing. */
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define('pla_session_id_ses_max', 36);
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/**
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* Creates a new session id, which includes an IP hash.
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*
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* @return string the new session ID string
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*/
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function pla_session_get_id() {
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debug_log(sprintf('pla_session_get_id(): Entered with ()'),2);
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$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 $new_id;
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}
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/**
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* Checks if the session belongs to an IP
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*
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* @return bool True, if the session is valid
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*/
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function pla_session_verify_id() {
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debug_log(sprintf('pla_session_verify_id(): Entered with ()'),2);
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$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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/**
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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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debug_log(sprintf('pla_session_start(): Entered with ()'),2);
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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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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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return;
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}
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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] = true;
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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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