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Use HTTP-Signature to authenticate when fetching photos.

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This commit is contained in:
Michael 2019-03-18 22:33:20 +00:00
parent d32105aa8b
commit a876c20850
3 changed files with 82 additions and 47 deletions
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3
src/Module/Photo.php
View file

@ -45,6 +45,9 @@ class Photo extends BaseModule
exit;
}
/// @todo Add Authentication to enable fetching of non public content
// $requester = HTTPSignature::getSigner('', $_SERVER);
$customsize = 0;
$photo = false;
switch($a->argc) {

42
src/Module/Proxy.php
View file

@ -10,8 +10,9 @@ use Friendica\Core\L10n;
use Friendica\Core\System;
use Friendica\Model\Photo;
use Friendica\Object\Image;
use Friendica\Util\Network;
use Friendica\Util\HTTPSignature;
use Friendica\Util\Proxy as ProxyUtils;
use Friendica\Core\Logger;
/**
* @brief Module Proxy
@ -81,38 +82,35 @@ class Proxy extends BaseModule
// Try to use photo from db
self::responseFromDB($request);
//
// If script is here, the requested url has never cached before.
// Let's fetch it, scale it if required, then save it in cache.
//
// It shouldn't happen but it does - spaces in URL
$request['url'] = str_replace(' ', '+', $request['url']);
$redirects = 0;
$fetchResult = Network::fetchUrlFull($request['url'], true, $redirects, 10);
$fetchResult = HTTPSignature::fetchRaw($request['url'], local_user(), true, ['timeout' => 10]);
$img_str = $fetchResult->getBody();
$tempfile = tempnam(get_temppath(), 'cache');
file_put_contents($tempfile, $img_str);
$mime = mime_content_type($tempfile);
unlink($tempfile);
// If there is an error then return a blank image
if ((substr($fetchResult->getReturnCode(), 0, 1) == '4') || (!$img_str)) {
self::responseError();
// stop.
}
$tempfile = tempnam(get_temppath(), 'cache');
file_put_contents($tempfile, $img_str);
$mime = mime_content_type($tempfile);
unlink($tempfile);
$image = new Image($img_str, $mime);
if (!$image->isValid()) {
self::responseError();
// stop.
}
$basepath = $a->getBasePath();
// Store original image
if ($direct_cache) {
// direct cache , store under ./proxy/
@ -159,8 +157,7 @@ class Proxy extends BaseModule
$a = self::getApp();
$size = 1024;
$sizetype = '';
// Look for filename in the arguments
if (($a->argc > 1) && !isset($_REQUEST['url'])) {
if (isset($a->argv[3])) {
@ -211,7 +208,7 @@ class Proxy extends BaseModule
} else {
$url = defaults($_REQUEST, 'url', '');
}
return [
'url' => $url,
'urlhash' => 'pic:' . sha1($url),
@ -239,9 +236,9 @@ class Proxy extends BaseModule
// Checking if caching into a folder in the webroot is activated and working
$direct_cache = (is_dir($basepath . '/proxy') && is_writable($basepath . '/proxy'));
// we don't use direct cache if image url is passed in args and not in querystring
// we don't use direct cache if image url is passed in args and not in querystring
$direct_cache = $direct_cache && ($a->argc > 1) && !isset($_REQUEST['url']);
return $direct_cache;
}
@ -277,8 +274,8 @@ class Proxy extends BaseModule
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
* @throws \ImagickException
*/
private static function responseFromDB(&$request) {
private static function responseFromDB(&$request)
{
$photo = Photo::getPhoto($request['urlhash']);
if ($photo !== false) {
@ -287,12 +284,13 @@ class Proxy extends BaseModule
// stop.
}
}
/**
* @brief Output a blank image, without cache headers, in case of errors
*
*/
private static function responseError() {
private static function responseError()
{
header('Content-type: image/png');
echo file_get_contents('images/blank.png');
exit();
@ -319,5 +317,3 @@ class Proxy extends BaseModule
exit();
}
}

84
src/Util/HTTPSignature.php
View file

@ -328,38 +328,18 @@ class HTTPSignature
*/
public static function fetch($request, $uid)
{
$owner = User::getOwnerDataById($uid);
$opts = ['accept_content' => 'application/activity+json, application/ld+json'];
$curlResult = self::fetchRaw($request, $uid, false, $opts);
if (!$owner) {
return;
if (empty($curlResult)) {
return false;
}
// Header data that is about to be signed.
$host = parse_url($request, PHP_URL_HOST);
$path = parse_url($request, PHP_URL_PATH);
$date = DateTimeFormat::utcNow(DateTimeFormat::HTTP);
$headers = ['Date: ' . $date, 'Host: ' . $host];
$signed_data = "(request-target): get " . $path . "\ndate: ". $date . "\nhost: " . $host;
$signature = base64_encode(Crypto::rsaSign($signed_data, $owner['uprvkey'], 'sha256'));
$headers[] = 'Signature: keyId="' . $owner['url'] . '#main-key' . '",algorithm="rsa-sha256",headers="(request-target) date host",signature="' . $signature . '"';
$headers[] = 'Accept: application/activity+json, application/ld+json';
$curlResult = Network::curl($request, false, $redirects, ['header' => $headers]);
$return_code = $curlResult->getReturnCode();
Logger::log('Fetched for user ' . $uid . ' from ' . $request . ' returned ' . $return_code, Logger::DEBUG);
if (!$curlResult->isSuccess() || empty($curlResult->getBody())) {
return false;
}
$content = json_decode($curlResult->getBody(), true);
if (empty($content) || !is_array($content)) {
return false;
}
@ -367,6 +347,62 @@ class HTTPSignature
return $content;
}
/**
* @brief Fetches raw data for a user
*
* @param string $request request url
* @param integer $uid User id of the requester
* @param boolean $binary TRUE if asked to return binary results (file download) (default is "false")
* @param array $opts (optional parameters) assoziative array with:
* 'accept_content' => supply Accept: header with 'accept_content' as the value
* 'timeout' => int Timeout in seconds, default system config value or 60 seconds
* 'http_auth' => username:password
* 'novalidate' => do not validate SSL certs, default is to validate using our CA list
* 'nobody' => only return the header
* 'cookiejar' => path to cookie jar file
*
* @return object CurlResult
* @throws \Friendica\Network\HTTPException\InternalServerErrorException
*/
public static function fetchRaw($request, $uid = 0, $binary = false, $opts = [])
{
if (!empty($uid)) {
$owner = User::getOwnerDataById($uid);
if (!$owner) {
return;
}
// Header data that is about to be signed.
$host = parse_url($request, PHP_URL_HOST);
$path = parse_url($request, PHP_URL_PATH);
$date = DateTimeFormat::utcNow(DateTimeFormat::HTTP);
$headers = ['Date: ' . $date, 'Host: ' . $host];
$signed_data = "(request-target): get " . $path . "\ndate: ". $date . "\nhost: " . $host;
$signature = base64_encode(Crypto::rsaSign($signed_data, $owner['uprvkey'], 'sha256'));
$headers[] = 'Signature: keyId="' . $owner['url'] . '#main-key' . '",algorithm="rsa-sha256",headers="(request-target) date host",signature="' . $signature . '"';
} else {
$headers = [];
}
if (!empty($opts['accept_content'])) {
$headers[] = 'Accept: ' . $opts['accept_content'];
}
$curl_opts = $opts;
$curl_opts['header'] = $headers;
$curlResult = Network::curl($request, false, $redirects, $curl_opts);
$return_code = $curlResult->getReturnCode();
Logger::log('Fetched for user ' . $uid . ' from ' . $request . ' returned ' . $return_code, Logger::DEBUG);
return $curlResult;
}
/**
* @brief Gets a signer from a given HTTP request
*