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<?php
namespace CloudflareBypass;
use \CloudflareBypass\Util\Logger;
use \CloudflareBypass\Util\StringFormatter;
/**
* CF Bypass Logic
* @author Kyran Rana
*/
class CFBypasser {
public static function exec( $cf_request_method, $type, $config )
{
// -- 1. Request the original page and confirm its protected.
/* If caching is enabled
* Then check if clearance cookies exist in cache for site.
*/
if (isset( $config['cache'] ) && $config['cache']) {
$components = parse_url( $cf_request_method->getUrl() );
/*
* If clearance cookies exist for site.
* Then assign clearance cookies to request handle.
*/
if (($cached_cookies = $config['cache']->fetch( $components['host'] )) !== false) {
// Debug
if ($config['verbose_mode'])
Logger::info(sprintf( "Found clearance cookies in cache for host: %s", $components['host'] ));
foreach ($cached_cookies as $cookie_name => $cookie_value) {
$cf_request_method->setCookie( $cookie_name, $cookie_value );
}
}
}
// Request original page.
$response = $cf_request_method->getPage();
$http_code = $cf_request_method->getHttpCode();
/* If original page is not protected by CF
* Then return original page / context
*/
if (!CFBypass::isBypassable( $response, $http_code )) {
if (method_exists( $cf_request_method, 'getContext' )) {
$response = $cf_request_method->getContext();
}
return $response;
}
// Debug
if ($config['verbose_mode'])
Logger::info(sprintf( "%s 1. handle checked and validated as protected.", $type ));
// -- 2. Setup a copy of the handle and set the required options (aka CF handle).
// Get CF handle.
$cf_request_method_copy = $cf_request_method->getCFResource();
// Debug
if ($config['verbose_mode'])
Logger::info(sprintf( "%s 2. got cloudflare handle.", $type ));
try {
// -- 3. Attempt to bypass the CF UAM page.
$first_attempt = true; // TRUE if its the first time trying to bypass CF.
$try_counter = 0; // How many times the bypass process has been tried.
while ( $try_counter < $config['max_retries'] ) {
// -- 3.1. Request UAM page again with new handle.
$uam_response = $cf_request_method_copy->getPage();
$uam_http_code = $cf_request_method_copy->getHttpCode();
$uam_url = $cf_request_method_copy->getUrl();
/* If original page is not protected by CF.
* Then return original page / context.
*/
if (!CFBypass::isBypassable( $uam_response, $uam_http_code )) {
if (method_exists( $cf_request_method, 'getContext' )) {
$uam_response = $cf_request_method_copy->getContext();
}
// close copy of cURL handle
$cf_request_method_copy->close();
return $uam_response;
}
// Debug
if ($config['verbose_mode']) {
Logger::info(sprintf(
"%s 3.1. (try: %s first_attempt: %s) uam page requested with new cURL handle.\n"
. "\trequest headers:\n\t%s\n"
. "\tresponse headers:\n\t%s\n",
$type, $try_counter, $first_attempt, implode( "\n\t", $cf_request_method_copy->getRequestHeaders() ), implode( "\n\t", $cf_request_method_copy->getResponseHeaders() ) ));
}
// -- 3.2. Validate handle has user agent and "__cfduid" cookie set. (only on first attempt)
/* If its the first attempt at trying to bypass CF.
* And handle has NO user agent set.
* Then throw exception.
*/
if ($first_attempt && !$cf_request_method_copy->getRequestHeader('User-Agent')) {
throw new \ErrorException('You need to set a user agent!');
}
/* If handle has NO cookie named "__cfduid".
* Then throw exception.
*/
if (!($cfduid_cookie = $cf_request_method_copy->getCookie('__cfduid'))) {
throw new \ErrorException('The cookie named "__cfduid" does not exist!');
}
// Debug
if ($config['verbose_mode']) {
Logger::info(sprintf( "%s 3.2. (try: %s first_attempt: %s) __cfduid cookie is: %s", $type, $try_counter, $first_attempt, $cfduid_cookie ));
}
// -- 3.3. Solve the JS challenge on the CF UAM page.
// Solve JS challange.
list( $s, $jschl_vc, $pass, $jschl_answer ) = CFBypass::bypass( $uam_response, $uam_url, $config['verbose_mode'] );
// Get clearance link.
$clearance_link = CFBypass::assemble( parse_url( $uam_url ), $s, $jschl_vc, $pass, $jschl_answer );
// Access clearance link.
$cf_request_method_copy->setUrl( $clearance_link );
$cf_request_method_copy->setFollowLocation( true );
$cf_request_method_copy->setRequestMethod( "GET" );
$cf_request_method_copy->getPage();
// Debug
if ($config['verbose_mode']) {
Logger::info(sprintf(
"%s 3.3. Requesting clearance link: %s\n"
. "\trequest headers:\n\t%s\n"
. "\tresponse headers:\n\t%s\n",
$type, $clearance_link, implode( "\n\t", $cf_request_method_copy->getRequestHeaders() ), implode( "\n\t", $cf_request_method_copy->getResponseHeaders() ) ));
}
// Check if we are successful in bypassing cloudflare.
if ($cfclearance_cookie = $cf_request_method_copy->getCookie('cf_clearance')) {
// Debug
if ($config['verbose_mode']) {
Logger::info(sprintf( "%s 3.3. (try: %s first_attempt: %s) cf_clearance cookie is: %s", $type, $try_counter, $first_attempt, $cfclearance_cookie ));
}
break;
}
// Set request url back to uam page.
$cf_request_method_copy->setUrl( $uam_url );
// No longer the first attempt.
$first_attempt = false;
$try_counter++;
}
/* If number of times we have tried to bypass CF has exceeded the maximum number of retries.
* Then throw exception.
*/
if ($try_counter === $config['max_retries']) {
throw new Exception('Exceeded maximum number of retries at getting cookie "cf_clearance".');
}
// 4. Apply clearance cookies to original handle.
$cookies = []; // For caching cookies (if enabled).
// Debug
if ($config['verbose_mode'])
Logger::info(sprintf( "%s 4. Setting cookies on original handle:", $type ));
foreach ( $cf_request_method_copy->getCookies() as $cookie_name => $cookie_value ) {
$cf_request_method->setCookie( $cookie_name, $cookie_value );
// Debug
if ($config['verbose_mode'])
Logger::info(sprintf( "\t\t%s", $cookie_value ));
$cookies[$cookie_name] = $cookie_value;
}
}
finally {
// close copy of cURL handle
$cf_request_method_copy->close();
}
/* If caching is enabled
* Then store clearance cookies in cache for site
*/
if (isset( $config['cache'] ) && $config['cache']) {
$components = parse_url( $cf_request_method->getUrl() );
// Debug
if ($config['verbose_mode'])
Logger::info(sprintf( "%s 4. Stored clearance cookies in cache for site: %s", $type, $uam_url ));
$config['cache']->store( $components['host'], $cookies );
}
// 5. Request actual website.
if (method_exists( $cf_request_method, 'getContext' )) {
// Debug
if (isset($config['verbose_mode'])) {
Logger::info(sprintf( "%s 5. Returned context", $type ));
}
return $cf_request_method->getContext();
}
$success = $cf_request_method->getPage();
// Debug
if ($config['verbose_mode']) {
Logger::info(sprintf(
"%s 5. Requested original page using clearance cookies.\n"
. "\trequest headers:\n\t%s\n"
. "\tresponse headers:\n\t%s\n",
$type, implode( "\n\t", $cf_request_method->getRequestHeaders() ), implode( "\n\t", $cf_request_method->getResponseHeaders() ) ));
}
return $success;
}
}