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<?php
namespace CloudflareBypass;
use \CloudflareBypass\Util\Logger;
/**
* CF Bypass utility.
* Bypasses CF (solves JS challenge)
* @author Kyran Rana
*/
class CFBypass
{
/**
* Given page content and headers, will check if page is protected by CF.
* (This method is NOT accurate and may fail in rare cases)
*
* @access public
* @param string $content Response body
* @param array $http_code Response http code
* @return bool
*/
public static function isBypassable( $content, $http_code )
{
// IUAM page should have a 503 error code.
if ((int)$http_code !== 503)
return false;
/* IUAM page should have the following strings:
* - jschl_vc, jschl_answer, pass, /cdn-cgi/l/chk_jschl
*/
$required_fields = [ "s", "jschl_vc", "jschl_answer", "pass"];
foreach ( $required_fields as $field ) {
if ( strpos( $content, $field ) === false )
return false;
}
return true;
}
/**
* Assembles clearance link.
*
* @access public
* @param string $uri URL components
* @param string $s S code.
* @param string $jschl_vc JSCHL VC value
* @param string $pass Pass value
* @param string $jschl_answer JSCHL answer value
*/
public static function assemble( $uri, $s, $jschl_vc, $pass, $jschl_answer ) {
$query = [];
if (isset( $uri['query'] ))
parse_str( $uri['query'], $query );
return sprintf("%s://%s/cdn-cgi/l/chk_jschl?%s",
$uri['scheme'],
$uri['host'],
// add user params and cf params.
http_build_query(array_merge(
[
's' => $s,
'jschl_vc' => $jschl_vc,
'pass' => $pass,
'jschl_answer' => $jschl_answer
],
$query )));;
}
/**
* Solves JS challenge on the IUAM page and returns the following fields:
* - jschl_vc
* - pass
* - jschl_answer.
*
* @access public
* @param string $iuam CF IUAM page.
* @param string $url Request URL
* @param boolean $verbose_mode TRUE to enable verbose mode.
* @throws \ErrorException if "jschl_vc" and "pass" input values CAN NOT be extracted.
* @throws \ErrorException if JS challenge code CAN NOT be extracted
* @throws \ErrorException if PHP evaluation of JS challenge code FAILS
* @return array jschl_vc, pass, jschl_answer
*/
public static function bypass( $iuam, $url, $verbose_mode=false )
{
// -- 1. Wait for 5 seconds.
sleep(5);
// Debug
if ($verbose_mode)
Logger::info("CFBypass 1. Waiting for 4 seconds...");
try {
// -- 2. Extract "s", "jschl_vc" and "pass" input values.
$s = self::getSCode( $iuam );
$jschl_vc = self::getJschlVC( $iuam );
$pass = self::getJschlPass( $iuam );
if ($jschl_vc === null || $pass === null) {
throw new \ErrorException("Unable to fetch \"jschl_vc\" and \"pass\" parameters!");
}
// Debug
if ($verbose_mode) {
Logger::info("CFBypass 2. Fetching parameters...");
Logger::info(sprintf( "\t\ts:\t%s", $s ));
Logger::info(sprintf( "\t\tjschl_vc:\t%s", $jschl_vc ));
Logger::info(sprintf( "\t\tpass:\t\t%s", $pass ));
}
// -- 3. Calculate JS challenge answer.
$uri = parse_url( $url );
$jschl_answer = self::getJschlAnswer( $iuam ) + mb_strlen( $uri['host'] );
// Debug
if ($verbose_mode) {
Logger::info("CFBypass 3. Calculating JS challenge answer...");
Logger::info(sprintf( "\t\tjschl_answer:\t%s", $jschl_answer ));
}
return array( $s, $jschl_vc, $pass, $jschl_answer );
} catch( Exception $ex ) {
// Debug
if ($verbose_mode)
Logger::error(sprintf( "CFBypass ERROR: %s", $ex->getMessage() ));
throw new \ErrorException( $ex );
}
}
// {{{ Getters
/**
* Gets s code
*
* @access public
* @param string $iuam CF IUAM page.
* @return string s code.
*/
public static function getSCode( $iuam )
{
preg_match( '/name="s" +value="(.+?)"/', $iuam, $matches );
return isset( $matches[1] ) ? $matches[1] : null;
}
/**
* Gets jschl verification code.
*
* @access public
* @param string $iuam CF IUAM page.
* @return string jschl verification code.
*/
public static function getJschlVC( $iuam )
{
preg_match( '/name="jschl_vc" +value="(.+?)"/', $iuam, $matches );
return isset( $matches[1] ) ? $matches[1] : null;
}
/**
* Gets jschl pass.
*
* @access public
* @param string $iuam CF IUAM page.
* @return string jschl pass.
*/
public static function getJschlPass( $iuam )
{
preg_match( '/name="pass" +value="(.+?)"/', $iuam, $matches );
return isset( $matches[1] ) ? $matches[1] : null;
}
/**
* Gets jschl answer.
*
* @access public
* @param string $iuam CF IUAM page.
* @return float jschl answer.
*/
public static function getJschlAnswer( $iuam )
{
// -- 1. Extract JavaScript challenge from IUAM page.
$iuam_jschl = "";
preg_match( '/(?<=s,t,o,p,b,r,e,a,k,i,n,g,f,\s)(\w+)={"(\w+)":(.+?)(?=})/', $iuam, $iuam_jschl_def_matches );
list( $_, $var1, $var2, $code ) = $iuam_jschl_def_matches;
preg_match_all( '/' . $var1 . '\.' . $var2 . '[+\-*\/]?=.+?;/', $iuam, $iuam_jschl_matches );
$iuam_jschl .= "\$jschl_answer=$code;\n";
foreach ( $iuam_jschl_matches[0] as $jschl_match ) {
$iuam_jschl .= str_replace( "$var1.$var2", '$jschl_answer', $jschl_match ) . "\n";
}
// -- 2. Solve JavaScript challenge.
$iuam_jschl = str_replace( ']+[]', '].""', $iuam_jschl );
$iuam_jschl = str_replace( array( '![]', '+[]' ), 0, $iuam_jschl );
while( preg_match_all( '/\([^()]+\)/', $iuam_jschl, $iuam_jschl_eq_matches ) ) {
foreach ( $iuam_jschl_eq_matches[0] as $eq_match ) {
if ( strpos( $eq_match, '.""' ) !== false ) {
$eq_answer = '"' . implode( "", array_map( function($match){
// Calculate equation and return as string.
return eval('return ' . str_replace( array( '(', ')' ), "", $match ) . ';');
}, array_filter( explode( '.""', $eq_match ), function($elem){
// Remove empty strings resulting from split.
return trim(str_replace( array( '(', ')' ), "", $elem )) !== "";
} ) ) ) . '"';
$iuam_jschl = str_replace( $eq_match, $eq_answer, $iuam_jschl );
} else {
if (strpos( $eq_match, '"' ) !== false) {
$eq_answer = implode( '.', array_map( function($match){
return strpos( $match, '"' ) !== false ? $match : '"' . $match . '"';
}, explode( '+', $eq_match ) ) );
} else {
$eq_answer = $eq_match;
}
// Calculate equation.
$eq_answer = eval('return ' . str_replace( array( '(', ')' ), "", $eq_answer ) . ';');
$iuam_jschl = str_replace( $eq_match, $eq_answer, $iuam_jschl );
}
}
}
// -- 3. Get JavaScript answer.
eval( $iuam_jschl );
return round( $jschl_answer, 10 );
}
// }}}
}