Added build/core/TreeToken
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xdrm-brackets
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0cbb21ece8
commit
4f2144f64b
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<?php
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namespace token\core;
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class TreeToken{
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private static $DEBUG = false;
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private $secret = null;
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private $step = 0;
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private $max_step = 0;
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private static $salt = '_9284 we;\'sa';
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private static $pepper = 'dasklj3948\'3=2';
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private $sync = null;
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/* (1) Constructs a new TreeToken
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*
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* @max_step<int> Max. number of children tokens
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*
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---------------------------------------------------------*/
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public function __construct($max_step=100){
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/* (1) Check argument */
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if( abs(intval($max_step)) !== $max_step || $max_step < 0 )
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throw new \Exception('Invalid argument type.');
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/* (2) Manage session */
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if( session_status() != PHP_SESSION_ACTIVE )
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\session_start();
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/* (3) Set attributes */
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$this->max_step = $max_step+1;
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}
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/* (2) Gets the existing parent
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*
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* @return status<bool> TRUE: right parent + token
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* FALSE: Invalid token
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* NULL: No parent found
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*
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---------------------------------------------------------*/
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private function check_parent(){
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/* (1) Check system state
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---------------------------------------------------------*/
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$has_token = isset($_COOKIE['_PUBLIC_']) && preg_match( '/^[a-z0-9]{128}$/i', $_COOKIE['_PUBLIC_'] );
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$has_parent = isset($_SESSION['_PRIVATE_']) && preg_match( '/^([a-z0-9]{128})\.(\d+)$/i', $_SESSION['_PRIVATE_'], $p_match );
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/* (1) If no parent -> NULL */
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if( !$has_parent )
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return null;
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/* (2) But if no token -> FALSE */
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if( !$has_token )
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return false;
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if( self::$DEBUG ){
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echo "* PARENT RECEIVED *\n";
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echo 'sess_id: '.session_id()."\n";
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echo 'pub: '.$_COOKIE['_PUBLIC_']."\n";
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echo 'priv: '.$_SESSION['_PRIVATE_']."\n";
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}
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/* (2) Check parent token
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---------------------------------------------------------*/
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/* (1) Check public token */
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if( self::tgen($p_match[1], $this->max_step) !== $_COOKIE['_PUBLIC_'] ){
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if( self::$DEBUG )
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echo "<b>/!\ invalid parent pub (token)</b>\n";
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return false;
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}
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/* (2) Inherit parent properties */
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$this->secret = $p_match[1];
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$this->step = $p_match[2];
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/* (3) If valid token */
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if( self::$DEBUG )
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echo "[ <b>Valid parent pub (token)</b> ]\n";
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return true;
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}
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/* (3) Create or regenerate a parent
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*
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* @inName<inType> inDesc
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*
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* @return outName<outType> outDesc
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*
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---------------------------------------------------------*/
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public function init_parent(){
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/* (1) Check parent
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---------------------------------------------------------*/
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/* (1) Process check */
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$valid_parent = $this->check_parent();
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/* (2) If invalid parent -> destroy session */
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if( $valid_parent === false ){
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if( self::$DEBUG )
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echo "-> new session <-\n";
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\session_regenerate_id(true); // true: delete old session
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\session_unset();
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\session_destroy();
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\session_start();
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}
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/* (2) Init new parent
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---------------------------------------------------------*/
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/* (1) Choose new secret */
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$this->secret = self::tgen(uniqid());
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/* (2) Set step = max */
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$this->step = $this->max_step;
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/* (3) Generate PRIVATE */
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$_SESSION['_PRIVATE_'] = $this->secret.'.'.$this->max_step;
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/* (4) Generate PUBLIC */
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$_COOKIE['_PUBLIC_'] = self::tgen($this->secret, $this->max_step);
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setcookie('_PUBLIC_', $_COOKIE['_PUBLIC_'], time()+30*60, '/');
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if( self::$DEBUG ){
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echo "\n* PARENT UPDATED *\n";
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echo 'sess_id: '.session_id()."\n";
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echo 'pub: '.$_COOKIE['_PUBLIC_']."\n";
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echo 'priv: '.$_SESSION['_PRIVATE_']."\n";
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}
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/* (5) Granted */
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return $valid_parent !== false;
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}
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/* (4) Checks a child
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*
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* @return status<bool> TRUE: Valid child
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* FALSE: Invalid token
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*
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---------------------------------------------------------*/
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private function check_child(){
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/* (1) Check the parent
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---------------------------------------------------------*/
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/* (1) Process parent check */
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$valid_parent = $this->check_parent();
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/* (2) Manage missing OR invalid parent */
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if( $valid_parent !== true )
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return false;
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/* (2) Check system state
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---------------------------------------------------------*/
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$has_token = !is_null(self::getTreeToken()) && preg_match( '/^[a-z0-9]{128}$/i', self::getTreeToken() );
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/* (1) If no token -> false */
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if( !$has_token )
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return false;
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/* (3) Check child token
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---------------------------------------------------------*/
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/* (1) If no more steps -> false */
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if( $this->step <= 1 ){
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if( self::$DEBUG )
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echo "<b>/!\ no more token available</b>\n";
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return false;
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}
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if( self::$DEBUG ){
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echo "* CHILD RECEIVED *\n";
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echo 'sess_id: '.session_id()."\n";
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echo 'token: '.self::getTreeToken()."\n";
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echo 'priv: '.$this->secret.'.'.$this->step."\n";
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}
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/* (2) Check child token */
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if( self::tgen($this->secret, $this->step) !== self::getTreeToken() ){
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if( self::$DEBUG )
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echo "<b>/!\ invalid child token</b>\n";
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return false;
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}
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/* (3) If valid token */
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if( self::$DEBUG )
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echo "[ <b>Valid child token</b> ]\n";
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return true;
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}
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/* (5) Updates a child
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*
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* @inName<inType> inDesc
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*
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* @return outName<outType> outDesc
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*
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---------------------------------------------------------*/
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public function init_child(){
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/* (1) Check child
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---------------------------------------------------------*/
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/* (1) Process check */
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$valid_child = $this->check_child();
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/* (2) If invalid child -> destroy session */
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if( $valid_child !== true )
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return false;
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/* (2) Update parent for other children
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---------------------------------------------------------*/
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/* (1) Decrement step */
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$this->step--;
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if( $this->step > 1 ){ // only if it is not the last step
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/* (2) Update step in session */
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$_SESSION['_PRIVATE_'] = $this->secret.'.'.$this->step;
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/* (3) Generate child-specific PUBLIC */
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header('X-Tree-Token: '.self::tgen($this->secret, $this->step));
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if( self::$DEBUG ){
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echo "\n* CHILD UPDATED *\n";
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echo 'sess_id: '.session_id()."\n";
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echo 'token: '.self::getTreeToken()."\n";
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echo 'priv: '.$_SESSION['_PRIVATE_']."\n";
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}
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}
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/* (2) Granted */
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return true;
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}
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/* (6) Get custom TreeToken header
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*
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* @return token<String> TreeToken fetched from header list
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* NULL on error
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*
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---------------------------------------------------------*/
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private static function getTreeToken(){
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/* (1) Check if exsits */
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if( !isset($_SERVER['HTTP_X_TREE_TOKEN']))
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return null;
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/* (2) Return result */
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return $_SERVER['HTTP_X_TREE_TOKEN'];
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}
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/* (x) Generates a pseudo-rdm token
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*
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* @data<String> Seed to use
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* @depth<int> Token depth
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*
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* @return token<String> @data hashed @depth times
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*
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---------------------------------------------------------*/
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private static function tgen($data, $depth=1){
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/* (0) If depth < 1 -> depth=1 */
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$depth = ( $depth < 1 ) ? 1 : $depth;
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/* (1) Apply salt */
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$hash = self::$salt.$data;
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/* (2) Hash @depth times */
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for( $d = 0 ; $d < $depth ; $d++ )
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$hash = ( $d == $depth-1 ) ? hash('sha512', $hash.self::$pepper) : hash('sha512', $hash);
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/* (3) Return hash */
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return $hash;
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}
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}
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