geturl.lib.php

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<?php
/* Copyright (C) 2008-2020  Laurent Destailleur     <eldy@users.sourceforge.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 * or see https://www.gnu.org/
 */
 
function getURLContent($url, $postorget = 'GET', $param = '', $followlocation = 1, $addheaders = array(), $allowedschemes = array('http', 'https'), $localurl = 0, $ssl_verifypeer = -1)
{
  //declaring of global variables
  global $conf;
  $USE_PROXY = empty($conf->global->MAIN_PROXY_USE) ? 0 : $conf->global->MAIN_PROXY_USE;
  $PROXY_HOST = empty($conf->global->MAIN_PROXY_HOST) ? 0 : $conf->global->MAIN_PROXY_HOST;
  $PROXY_PORT = empty($conf->global->MAIN_PROXY_PORT) ? 0 : $conf->global->MAIN_PROXY_PORT;
  $PROXY_USER = empty($conf->global->MAIN_PROXY_USER) ? 0 : $conf->global->MAIN_PROXY_USER;
  $PROXY_PASS = empty($conf->global->MAIN_PROXY_PASS) ? 0 : $conf->global->MAIN_PROXY_PASS;
 
  dol_syslog("getURLContent postorget=".$postorget." URL=".$url." param=".$param);
 
  //setting the curl parameters.
  $ch = curl_init();
 
  /*print $API_Endpoint."-".$API_version."-".$PAYPAL_API_USER."-".$PAYPAL_API_PASSWORD."-".$PAYPAL_API_SIGNATURE."<br>";
   print $USE_PROXY."-".$gv_ApiErrorURL."<br>";
   print $nvpStr;
   exit;*/
  curl_setopt($ch, CURLOPT_VERBOSE, 1);
  curl_setopt($ch, CURLOPT_USERAGENT, 'Dolibarr geturl function');
 
  // We use @ here because this may return warning if safe mode is on or open_basedir is on (following location is forbidden when safe mode is on).
  // We force value to false so we will manage redirection ourself later.
  @curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false);
 
  if (is_array($addheaders) && count($addheaders)) {
    curl_setopt($ch, CURLOPT_HTTPHEADER, $addheaders);
  }
  curl_setopt($ch, CURLINFO_HEADER_OUT, true); // To be able to retrieve request header and log it
 
  // By default use tls decied by PHP.
  // You can force, if supported a version like TLSv1 or TLSv1.2
  if (!empty($conf->global->MAIN_CURL_SSLVERSION)) {
    curl_setopt($ch, CURLOPT_SSLVERSION, $conf->global->MAIN_CURL_SSLVERSION);
  }
  //curl_setopt($ch, CURLOPT_SSLVERSION, 6); for tls 1.2
 
  // Turning on or off the ssl target certificate
  if ($ssl_verifypeer < 0) {
    global $dolibarr_main_prod;
    $ssl_verifypeer =  ($dolibarr_main_prod ? true : false);
  }
  if (!empty($conf->global->MAIN_CURL_DISABLE_VERIFYPEER)) {
    $ssl_verifypeer = 0;
  }
 
  // Turning off the server and peer verification(TrustManager Concept).
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, ($ssl_verifypeer ? true : false));
  curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, ($ssl_verifypeer ? true : false));
 
  // Restrict use to some protocols only
  $protocols = 0;
  if (is_array($allowedschemes)) {
    foreach ($allowedschemes as $allowedscheme) {
      if ($allowedscheme == 'http') {
        $protocols |= CURLPROTO_HTTP;
      }
      if ($allowedscheme == 'https') {
        $protocols |= CURLPROTO_HTTPS;
      }
    }
    curl_setopt($ch, CURLOPT_PROTOCOLS, $protocols);
    curl_setopt($ch, CURLOPT_REDIR_PROTOCOLS, $protocols);
  }
 
  curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, empty($conf->global->MAIN_USE_CONNECT_TIMEOUT) ? 5 : $conf->global->MAIN_USE_CONNECT_TIMEOUT);
  curl_setopt($ch, CURLOPT_TIMEOUT, empty($conf->global->MAIN_USE_RESPONSE_TIMEOUT) ? 30 : $conf->global->MAIN_USE_RESPONSE_TIMEOUT);
 
  // limit size of downloaded files. TODO Add MAIN_SECURITY_MAXFILESIZE_DOWNLOADED
  $maxsize = getDolGlobalInt('MAIN_SECURITY_MAXFILESIZE_DOWNLOADED');
  if ($maxsize && defined('CURLOPT_MAXFILESIZE_LARGE')) {
    curl_setopt($ch, CURLOPT_MAXFILESIZE_LARGE, $maxsize);
  }
  if ($maxsize && defined('CURLOPT_MAXFILESIZE')) {
    curl_setopt($ch, CURLOPT_MAXFILESIZE, $maxsize);
  }
 
  //curl_setopt($ch, CURLOPT_SAFE_UPLOAD, true);  // PHP 5.5
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); // We want response
  if ($postorget == 'POST') {
    curl_setopt($ch, CURLOPT_POST, 1); // POST
    curl_setopt($ch, CURLOPT_POSTFIELDS, $param); // Setting param x=a&y=z as POST fields
  } elseif ($postorget == 'POSTALREADYFORMATED') {
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST'); // HTTP request is 'POST' but param string is taken as it is
    curl_setopt($ch, CURLOPT_POSTFIELDS, $param); // param = content of post, like a xml string
  } elseif ($postorget == 'PUT') {
    $array_param = null;
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT'); // HTTP request is 'PUT'
    if (!is_array($param)) {
      parse_str($param, $array_param);
    } else {
      dol_syslog("parameter param must be a string", LOG_WARNING);
      $array_param = $param;
    }
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($array_param)); // Setting param x=a&y=z as PUT fields
  } elseif ($postorget == 'PUTALREADYFORMATED') {
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT'); // HTTP request is 'PUT'
    curl_setopt($ch, CURLOPT_POSTFIELDS, $param); // param = content of post, like a xml string
  } elseif ($postorget == 'HEAD') {
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'HEAD'); // HTTP request is 'HEAD'
    curl_setopt($ch, CURLOPT_NOBODY, true);
  } elseif ($postorget == 'DELETE') {
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'DELETE'); // POST
  } else {
    curl_setopt($ch, CURLOPT_POST, 0); // GET
  }
 
  //if USE_PROXY constant set at begin of this method.
  if ($USE_PROXY) {
    dol_syslog("getURLContent set proxy to ".$PROXY_HOST.":".$PROXY_PORT." - ".$PROXY_USER.":".$PROXY_PASS);
    //curl_setopt ($ch, CURLOPT_PROXYTYPE, CURLPROXY_HTTP); // Curl 7.10
    curl_setopt($ch, CURLOPT_PROXY, $PROXY_HOST.":".$PROXY_PORT);
    if ($PROXY_USER) {
      curl_setopt($ch, CURLOPT_PROXYUSERPWD, $PROXY_USER.":".$PROXY_PASS);
    }
  }
 
  $newUrl = $url;
  $maxRedirection = 5;
  $info = array();
  $response = '';
 
  do {
    if ($maxRedirection < 1) {
      break;
    }
 
    curl_setopt($ch, CURLOPT_URL, $newUrl);
 
    // Parse $newUrl
    $newUrlArray = parse_url($newUrl);
    $hosttocheck = $newUrlArray['host'];
    $hosttocheck = str_replace(array('[', ']'), '', $hosttocheck); // Remove brackets of IPv6
 
    // Deny some reserved host names
    if (in_array($hosttocheck, array('metadata.google.internal'))) {
      $info['http_code'] = 400;
      $info['content'] = 'Error bad hostname '.$hosttocheck.' (Used by Google metadata). This value for hostname is not allowed.';
      break;
    }
 
    // Clean host name $hosttocheck to convert it into an IP $iptocheck
    if (in_array($hosttocheck, array('localhost', 'localhost.domain'))) {
      $iptocheck = '127.0.0.1';
    } elseif (in_array($hosttocheck, array('ip6-localhost', 'ip6-loopback'))) {
      $iptocheck = '::1';
    } else {
      // Resolve $hosttocheck to get the IP $iptocheck
      if (function_exists('gethostbyname')) {
        $iptocheck = gethostbyname($hosttocheck);
      } else {
        $iptocheck = $hosttocheck;
      }
      // TODO Resolve ip v6
    }
 
    // Check $iptocheck is an IP (v4 or v6), if not clear value.
    if (!filter_var($iptocheck, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 | FILTER_FLAG_IPV6)) { // This is not an IP, we clean data
      $iptocheck = '0'; //
    }
 
    if ($iptocheck) {
      $tmpresult = isIPAllowed($iptocheck, $localurl);
      if ($tmpresult) {
        $info['http_code'] = 400;
        $info['content'] = $tmpresult;
        break;
      }
    }
 
    if ($iptocheck) {
      // Set CURLOPT_CONNECT_TO so curl will not try another resolution that may give a different result. Possible only on PHP v7+
      if (defined('CURLOPT_CONNECT_TO')) {
        $connect_to = array(sprintf("%s:%d:%s:%d", $newUrlArray['host'], empty($newUrlArray['port'])?'':$newUrlArray['port'], $iptocheck, empty($newUrlArray['port'])?'':$newUrlArray['port']));
        //var_dump($newUrlArray);
        //var_dump($connect_to);
        curl_setopt($ch, CURLOPT_CONNECT_TO, $connect_to);
      }
    }
 
    // Getting response from server
    $response = curl_exec($ch);
 
    $info = curl_getinfo($ch); // Reading of request must be done after sending request
    $http_code = $info['http_code'];
 
    if ($followlocation && ($http_code == 301 || $http_code == 302 || $http_code == 303 || $http_code == 307)) {
      $newUrl = $info['redirect_url'];
      $maxRedirection--;
      // TODO Use $info['local_ip'] and $info['primary_ip'] ?
      continue;
    }
 
    $http_code = 0;
  } while ($http_code);
 
  $request = curl_getinfo($ch, CURLINFO_HEADER_OUT); // Reading of request must be done after sending request
 
  dol_syslog("getURLContent request=".$request);
  if (getDolGlobalInt('MAIN_CURL_DEBUG')) {
    // This may contains binary data, so we dont output reponse by default.
    dol_syslog("getURLContent request=".$request, LOG_DEBUG, 0, '_curl');
    dol_syslog("getURLContent response =".$response, LOG_DEBUG, 0, '_curl');
  }
  dol_syslog("getURLContent response size=".strlen($response)); // This may contains binary data, so we dont output it
 
  $rep = array();
  if (curl_errno($ch)) {
    // Add keys to $rep
    $rep['content'] = $response;
 
    // moving to display page to display curl errors
    $rep['curl_error_no'] = curl_errno($ch);
    $rep['curl_error_msg'] = curl_error($ch);
 
    dol_syslog("getURLContent response array is ".join(',', $rep));
  } else {
    //$info = curl_getinfo($ch);
 
    // Add keys to $rep
    $rep = $info;
    //$rep['header_size']=$info['header_size'];
    //$rep['http_code']=$info['http_code'];
    dol_syslog("getURLContent http_code=".$rep['http_code']);
 
    // Add more keys to $rep
    if ($response) {
      $rep['content'] = $response;
    }
    $rep['curl_error_no'] = '';
    $rep['curl_error_msg'] = '';
  }
 
  //closing the curl
  curl_close($ch);
 
  return $rep;
}
 
function isIPAllowed($iptocheck, $localurl)
{
  global $conf;
 
  if ($localurl == 0) { // Only external url allowed (dangerous, may allow to get malware)
    if (!filter_var($iptocheck, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE)) {
      // Deny ips like 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, 0.0.0.0/8, 169.254.0.0/16, 127.0.0.0/8 et 240.0.0.0/4, ::1/128, ::/128, ::ffff:0:0/96, fe80::/10...
      $errormsg = 'Error bad hostname IP (private or reserved range). Must be an external URL.';
      return $errormsg;
    }
    if (!empty($_SERVER["SERVER_ADDR"]) && $iptocheck == $_SERVER["SERVER_ADDR"]) {
      $errormsg = 'Error bad hostname IP (IP is a local IP). Must be an external URL.';
      return $errormsg;
    }
    if (!empty($conf->global->MAIN_SECURITY_ANTI_SSRF_SERVER_IP) && in_array($iptocheck, explode(',', $conf->global->MAIN_SECURITY_ANTI_SSRF_SERVER_IP))) {
      $errormsg = 'Error bad hostname IP (IP is a local IP defined into MAIN_SECURITY_SERVER_IP). Must be an external URL.';
      return $errormsg;
    }
  }
  if ($localurl == 1) { // Only local url allowed (dangerous, may allow to get metadata on server or make internal port scanning)
    // Deny ips NOT like 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, 0.0.0.0/8, 169.254.0.0/16, 127.0.0.0/8 et 240.0.0.0/4, ::1/128, ::/128, ::ffff:0:0/96, fe80::/10...
    if (filter_var($iptocheck, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE)) {
      $errormsg = 'Error bad hostname '.$iptocheck.'. Must be a local URL.';
      return $errormsg;
    }
    if (!empty($conf->global->MAIN_SECURITY_ANTI_SSRF_SERVER_IP) && !in_array($iptocheck, explode(',', $conf->global->MAIN_SECURITY_ANTI_SSRF_SERVER_IP))) {
      $errormsg = 'Error bad hostname IP (IP is not a local IP defined into list MAIN_SECURITY_SERVER_IP). Must be a local URL in allowed list.';
      return $errormsg;
    }
  }
 
  // Common check on ip (local and external)
  // See list on https://tagmerge.com/gist/a7b9d57ff8ec11d63642f8778609a0b8
  // Not evasive url that ar enot IP are excluded by test on IP v4/v6 validity.
  $arrayofmetadataserver = array(
    '100.100.100.200' => 'Alibaba',
    '192.0.0.192' => 'Oracle',
    '192.80.8.124' => 'Packet',
    '100.88.222.5' => 'Tencent cloud',
  );
  foreach ($arrayofmetadataserver as $ipofmetadataserver => $nameofmetadataserver) {
    if ($iptocheck == $ipofmetadataserver) {
      $errormsg = 'Error bad hostname IP (Used by '.$nameofmetadataserver.' metadata server). This IP is forbidden.';
      return $errormsg;
    }
  }
 
  return '';
}
 
function getDomainFromURL($url, $mode = 0)
{
  $tmpdomain = preg_replace('/^https?:\/\//i', '', $url); // Remove http(s)://
  $tmpdomain = preg_replace('/\/.*$/i', '', $tmpdomain); // Remove part after domain
  if ($mode == 2) {
    $tmpdomain = preg_replace('/^.*\.([^\.]+)\.([^\.]+)\.([^\.]+)$/', '\1.\2.\3', $tmpdomain); // Remove part 'www.' before 'abc.mydomain.com'
  } else {
    $tmpdomain = preg_replace('/^.*\.([^\.]+)\.([^\.]+)$/', '\1.\2', $tmpdomain); // Remove part 'www.abc.' before 'mydomain.com'
  }
  if (empty($mode)) {
    $tmpdomain = preg_replace('/\.[^\.]+$/', '', $tmpdomain); // Remove first level domain (.com, .net, ...)
  }
 
  return $tmpdomain;
}
 
function getRootURLFromURL($url)
{
  $prefix = '';
  $tmpurl = $url;
  $reg = null;
  if (preg_match('/^(https?:\/\/)/i', $tmpurl, $reg)) {
    $prefix = $reg[1];
  }
  $tmpurl = preg_replace('/^https?:\/\//i', '', $tmpurl); // Remove http(s)://
  $tmpurl = preg_replace('/\/.*$/i', '', $tmpurl); // Remove part after domain
 
  return $prefix.$tmpurl;
}
 
function removeHtmlComment($content)
{
  $content = preg_replace('/<!--[^\-]+-->/', '', $content);
  return $content;
}