X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=include%2Fsalmon.php;h=3d525f51ad36d0a2d55349937c140e404f8b56ea;hb=ea88e15a8cc10f99621720ca0e5a9598d0e64e0f;hp=bd2d620a815132b4087c3d1e52d73a323180cc3f;hpb=5edee3c4d1f84c07c1c54775072601188075a542;p=friendica.git

diff --git a/include/salmon.php b/include/salmon.php
index bd2d620a81..6675849ce4 100644
--- a/include/salmon.php
+++ b/include/salmon.php
@@ -1,127 +1,183 @@
 <?php
 
-require_once('library/asn1.php');
+use Friendica\Network\Probe;
 
-function salmon_key($pubkey) {
-	$lines = explode("\n",$pubkey);
-	unset($lines[0]);
-	unset($lines[count($lines)]);
-	$x = base64_decode(implode('',$lines));
+require_once 'include/crypto.php';
 
-	$r = ASN_BASE::parseASNString($x);
+function get_salmon_key($uri, $keyhash) {
+	$ret = array();
 
-	$m = $r[0]->asnData[1]->asnData[0]->asnData[0]->asnData;
-	$e = $r[0]->asnData[1]->asnData[0]->asnData[1]->asnData;
+	logger('Fetching salmon key for '.$uri);
 
+	$arr = Probe::lrdd($uri);
 
-	return 'RSA' . '.' . $m . '.' . $e ;
-}
+	if (is_array($arr)) {
+		foreach ($arr as $a) {
+			if ($a['@attributes']['rel'] === 'magic-public-key') {
+				$ret[] = $a['@attributes']['href'];
+			}
+		}
+	} else {
+		return '';
+	}
 
+	// We have found at least one key URL
+	// If it's inline, parse it - otherwise get the key
 
-function base64url_encode($s) {
-	return strtr(base64_encode($s),'+/','-_');
-}
+	if (count($ret) > 0) {
+		for ($x = 0; $x < count($ret); $x ++) {
+			if (substr($ret[$x], 0, 5) === 'data:') {
+				if (strstr($ret[$x], ',')) {
+					$ret[$x] = substr($ret[$x], strpos($ret[$x], ',') + 1);
+				} else {
+					$ret[$x] = substr($ret[$x], 5);
+				}
+			} elseif (normalise_link($ret[$x]) == 'http://') {
+				$ret[$x] = fetch_url($ret[$x]);
+			}
+		}
+	}
 
-function base64url_decode($s) {
-	return base64_decode(strtr($s,'-_','+/'));
-}
 
-function get_salmon_key($uri,$keyhash) {
-	$ret = array();
+	logger('Key located: ' . print_r($ret, true));
 
-	$debugging = get_config('system','debugging');
-	if($debugging)		
-		file_put_contents('salmon.out', "\n" . 'Fetch key' . "\n", FILE_APPEND);
+	if (count($ret) == 1) {
 
-	if(strstr($uri,'@')) {	
-		$arr = webfinger($uri);
-		if($debugging)
-			file_put_contents('salmon.out', "\n" . 'Fetch key from webfinger' . "\n", FILE_APPEND);
-	}
-	else {
-		$html = fetch_url($uri);
-		$a = get_app();
-		$h = $a->get_curl_headers();
-		if($debugging)
-			file_put_contents('salmon.out', "\n" . 'Fetch key via HTML header: ' . $h . "\n", FILE_APPEND);
-
-		$l = explode("\n",$h);
-		if(count($l)) {
-			foreach($l as $line) {
-				
-				if($debugging)
-					file_put_contents('salmon.out', "\n" . $line . "\n", FILE_APPEND);
-				if((stristr($line,'link:')) && preg_match('/<([^>].*)>.*rel\=[\'\"]lrdd[\'\"]/',$line,$matches)) {
-					$link = $matches[1];
-					if($debugging)
-						file_put_contents('salmon.out', "\n" . 'Fetch key via Link from header: ' . $link . "\n", FILE_APPEND);
-					break;
-				}
+		// We only found one one key so we don't care if the hash matches.
+		// If it's the wrong key we'll find out soon enough because
+		// message verification will fail. This also covers some older
+		// software which don't supply a keyhash. As long as they only
+		// have one key we'll be right.
+
+		return $ret[0];
+	} else {
+		foreach ($ret as $a) {
+			$hash = base64url_encode(hash('sha256', $a));
+			if ($hash == $keyhash) {
+				return $a;
 			}
 		}
 	}
 
-	if(! isset($link)) {
-		require_once('library/HTML5/Parser.php');
-		$dom = HTML5_Parser::parse($html);
+	return '';
+}
 
-		if(! $dom)
-			return '';
 
-		$items = $dom->getElementsByTagName('link');
 
-		foreach($items as $item) {
-			$x = $item->getAttribute('rel');
-			if($x == "lrdd") {
-				$link = $item->getAttribute('href');
-				if($debugging)
-					file_put_contents('salmon.out', "\n" . 'Fetch key via HTML body' . $link . "\n", FILE_APPEND);
-				break;
-			}
-		}
+function slapper($owner, $url, $slap) {
+
+	// does contact have a salmon endpoint?
+
+	if (! strlen($url)) {
+		return;
 	}
 
-	if(! isset($link))
-		return '';
+	if (! $owner['sprvkey']) {
+		logger(sprintf("user '%s' (%d) does not have a salmon private key. Send failed.",
+		$owner['username'], $owner['uid']));
+		return;
+	}
 
-	$arr = fetch_xrd_links($link);
+	logger('slapper called for '.$url.'. Data: ' . $slap);
 
-	if($arr) {
-		foreach($arr as $a) {
-			if($a['@attributes']['rel'] === 'magic-public-key') {
-				$ret[] = $a['@attributes']['href'];
-			}
-		}
+	// create a magic envelope
+
+	$data      = base64url_encode($slap);
+	$data_type = 'application/atom+xml';
+	$encoding  = 'base64url';
+	$algorithm = 'RSA-SHA256';
+	$keyhash   = base64url_encode(hash('sha256', salmon_key($owner['spubkey'])), true);
+
+	$precomputed = '.' . base64url_encode($data_type) . '.' . base64url_encode($encoding) . '.' . base64url_encode($algorithm);
+
+	// GNU Social format
+	$signature   = base64url_encode(rsa_sign($data . $precomputed, $owner['sprvkey']));
+
+	// Compliant format
+	$signature2  = base64url_encode(rsa_sign(str_replace('=', '', $data . $precomputed), $owner['sprvkey']));
+
+	// Old Status.net format
+	$signature3  = base64url_encode(rsa_sign($data, $owner['sprvkey']));
+
+	// At first try the non compliant method that works for GNU Social
+	$xmldata = array("me:env" => array("me:data" => $data,
+			"@attributes" => array("type" => $data_type),
+			"me:encoding" => $encoding,
+			"me:alg" => $algorithm,
+			"me:sig" => $signature,
+			"@attributes2" => array("key_id" => $keyhash)));
+
+	$namespaces = array("me" => "http://salmon-protocol.org/ns/magic-env");
+
+	$salmon = xml::from_array($xmldata, $xml, false, $namespaces);
+
+	// slap them
+	post_url($url, $salmon, array(
+		'Content-type: application/magic-envelope+xml',
+		'Content-length: ' . strlen($salmon)
+	));
+
+	$a = get_app();
+	$return_code = $a->get_curl_code();
+
+	// check for success, e.g. 2xx
+
+	if ($return_code > 299) {
+
+		logger('GNU Social salmon failed. Falling back to compliant mode');
+
+		// Now try the compliant mode that normally isn't used for GNU Social
+		$xmldata = array("me:env" => array("me:data" => $data,
+				"@attributes" => array("type" => $data_type),
+				"me:encoding" => $encoding,
+				"me:alg" => $algorithm,
+				"me:sig" => $signature2,
+				"@attributes2" => array("key_id" => $keyhash)));
+
+		$namespaces = array("me" => "http://salmon-protocol.org/ns/magic-env");
+
+		$salmon = xml::from_array($xmldata, $xml, false, $namespaces);
+
+		// slap them
+		post_url($url, $salmon, array(
+			'Content-type: application/magic-envelope+xml',
+			'Content-length: ' . strlen($salmon)
+		));
+		$return_code = $a->get_curl_code();
 	}
-	if(count($ret)) {
-		for($x = 0; $x < count($ret); $x ++) {
-			if(substr($ret[$x],0,5) === 'data:') {
-				if(strstr($ret[$x],','))
-					$ret[$x] = substr($ret[$x],strpos($ret[$x],',')+1);
-				else
-					$ret[$x] = substr($ret[$x],5);
-			}
-			else
-				$ret[$x] = fetch_url($ret[$x]);
-		}
+
+	if ($return_code > 299) {
+		logger('compliant salmon failed. Falling back to old status.net');
+
+		// Last try. This will most likely fail as well.
+		$xmldata = array("me:env" => array("me:data" => $data,
+				"@attributes" => array("type" => $data_type),
+				"me:encoding" => $encoding,
+				"me:alg" => $algorithm,
+				"me:sig" => $signature3,
+				"@attributes2" => array("key_id" => $keyhash)));
+
+		$namespaces = array("me" => "http://salmon-protocol.org/ns/magic-env");
+
+		$salmon = xml::from_array($xmldata, $xml, false, $namespaces);
+
+		// slap them
+		post_url($url, $salmon, array(
+			'Content-type: application/magic-envelope+xml',
+			'Content-length: ' . strlen($salmon)
+		));
+		$return_code = $a->get_curl_code();
 	}
-	if($debugging)
-		file_put_contents('salmon.out', "\n" . 'Key located: ' . print_r($ret,true) . "\n", FILE_APPEND);
 
-	if(count($ret) == 1) {
-		return $ret[0];
+	logger('slapper for '.$url.' returned ' . $return_code);
+
+	if (! $return_code) {
+		return -1;
 	}
-	else {
-		foreach($ret as $a) {
-			$hash = base64url_encode(hash('sha256',$a));
-			if($hash == $keyhash)
-				return $a;
-		}
+
+	if (($return_code == 503) && (stristr($a->get_curl_headers(), 'retry-after'))) {
+		return -1;
 	}
 
-	return '';
+	return ((($return_code >= 200) && ($return_code < 300)) ? 0 : 1);
 }
-
-	
-		
-				
\ No newline at end of file