Use HTTP-Signature to authenticate when fetching photos.

src/Module/Photo.php

@@ -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) {

src/Module/Proxy.php

@@ -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;
+		$fetchResult = HTTPSignature::fetchRaw($request['url'], local_user(), true, ['timeout' => 10]);
-		$fetchResult = Network::fetchUrlFull($request['url'], true, $redirects, 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();
 	}
 }
-
-

src/Util/HTTPSignature.php

@@ -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 (!$owner) {
+		if (empty($curlResult)) {
-			return;
+			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
 	 *