source: admin/csp_report.php @ 3453:0dab0a0d4621

<?php
// From: https://github.com/nico3333fr/CSP-useful
//
// Note: this script requires PHP ≥ 5.4.
// Inspired from https://mathiasbynens.be/notes/csp-reports

// Dareboost wants it? Not a problem.
header('X-Content-Type-Options: "nosniff"');

require dirname(__FILE__).'/../inc/admin/prepend.php';

// Specify admin CSP log file if necessary
if (!defined('LOGFILE')) {
     define('LOGFILE',path::real(DC_VAR).'/csp/csp_report.json');
}

// Get the raw POST data
$data = file_get_contents('php://input');

// Only continue if it’s valid JSON that is not just `null`, `0`, `false` or an
// empty string, i.e. if it could be a CSP violation report.
if ($data = json_decode($data,true)) {

     // get source-file and blocked-URI to perform some tests
     $source_file = $data['csp-report']['source-file'];
     $blocked_uri = $data['csp-report']['blocked-uri'];

     if (
          // avoid false positives notifications coming from Chrome extensions (Wappalyzer, MuteTab, etc.)
          // bug here https://code.google.com/p/chromium/issues/detail?id=524356
          strpos($source_file, 'chrome-extension://') === false

          // avoid false positives notifications coming from Safari extensions (diigo, evernote, etc.)
          && strpos($source_file, 'safari-extension://') === false
          && strpos($blocked_uri, 'safari-extension://') === false

          // search engine extensions ?
          && strpos($source_file, 'se-extension://') === false

          // added by browsers in webviews
          && strpos($blocked_uri, 'webviewprogressproxy://') === false

          // Google Search App see for details https://github.com/nico3333fr/CSP-useful/commit/ecc8f9b0b379ae643bc754d2db33c8b47e185fd1
          && strpos($blocked_uri, 'gsa://onpageload') === false

     ) {
          // Prepare report data (hash => info)
          $hash = hash('md5',
               $data['csp-report']['blocked-uri'].
               $data['csp-report']['document-uri'].
               $data['csp-report']['source-file'].
               $data['csp-report']['line-number'].
               $data['csp-report']['violated-directive']);

          try {
               // Check report dir (create it if necessary)
               files::makeDir(dirname(LOGFILE),true);

               // Check if report is not already stored in log file
               $contents = '';
               if (file_exists(LOGFILE)) {
                    $contents = file_get_contents(LOGFILE);
                    if ($contents && $contents != '') {
                         if (substr($contents,-1) == ',') {
                              // Remove final comma if present
                              $contents = substr($contents,0,-1);
                         }
                         if ($contents != '') {
                              $list = json_decode('['.$contents.']',true);
                              if (is_array($list)) {
                                   foreach ($list as $idx => $value) {
                                        if (isset($value['hash']) && $value['hash'] == $hash) {
                                             // Already stored, ignore
                                             return;
                                        }
                                   }
                              }
                         }
                    }
               }

               // Add report to the file
               if (!($fp = @fopen(LOGFILE,'a'))) {
                    // Unable to open file, ignore
                    return;
               }

               // Prettify the JSON-formatted data
               $violation = array_merge(array('hash' => $hash),$data['csp-report']);
               $output = json_encode($violation,JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);

               // The file content will have to be enclosed in brackets [] before
               // beeing decoded with json_decoded(<content>,true);
               fprintf($fp,($contents != '' ? ',' : '').'%s',$output);

          }  catch (Exception $e) {
               return;
          }
     }
}