X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=include%2Fsalmon.php;h=8a56882adb6f16ef6671b8b431cb38428e482c91;hb=9f1f9da89bb98d768b7a41b388e9c5c0d28ec946;hp=7198f07c60a681923131dd9ea333dc0a85792866;hpb=013d2604f886bc7cbd2c5263d3577e8cf40f9fcc;p=friendica.git

diff --git a/include/salmon.php b/include/salmon.php
index 7198f07c60..8a56882adb 100644
--- a/include/salmon.php
+++ b/include/salmon.php
@@ -16,3 +16,197 @@ function salmon_key($pubkey) {
 
 	return 'RSA' . '.' . $m . '.' . $e ;
 }
+
+
+function base64url_encode($s, $strip_padding = false) {
+
+	$s = strtr(base64_encode($s),'+/','-_');
+
+	if($strip_padding)
+		$s = str_replace('=','',$s);
+
+	return $s;
+}
+
+function base64url_decode($s) {
+
+/*
+ *  // Placeholder for new rev of salmon which strips base64 padding.
+ *  // PHP base64_decode handles the un-padded input without requiring this step
+ *  // Uncomment if you find you need it.
+ *
+ *	$l = strlen($s);
+ *	if(! strpos($s,'=')) {
+ *		$m = $l % 4;
+ *		if($m == 2)
+ *			$s .= '==';
+ *		if($m == 3)
+ *			$s .= '=';
+ *	}
+ *
+ */
+
+	return base64_decode(strtr($s,'-_','+/'));
+}
+
+function get_salmon_key($uri,$keyhash) {
+	$ret = array();
+
+	logger('Fetching salmon key');
+
+	$arr = lrdd($uri);
+
+	if(is_array($arr)) {
+		foreach($arr as $a) {
+			if($a['@attributes']['rel'] === 'magic-public-key') {
+				$ret[] = $a['@attributes']['href'];
+			}
+		}
+	}
+	else {
+		return '';
+	}
+
+	// We have found at least one key URL
+	// If it's inline, parse it - otherwise get the key
+
+	if(count($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]);
+		}
+	}
+
+
+	logger('Key located: ' . print_r($ret,true));
+
+	if(count($ret) == 1) {
+
+		// 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 $a;
+		}
+	}
+
+	return '';
+}
+
+	
+		
+function slapper($owner,$url,$slap) {
+
+	logger('slapper called. Data: ' . $slap);
+
+	// does contact have a salmon endpoint? 
+
+	if(! strlen($url))
+		return;
+
+	// add all namespaces to item
+
+$namespaces = <<< EOT
+<entry xmlns="http://www.w3.org/2005/Atom"
+      xmlns:thr="http://purl.org/syndication/thread/1.0"
+      xmlns:at="http://purl.org/atompub/tombstones/1.0"
+      xmlns:media="http://purl.org/syndication/atommedia"
+      xmlns:dfrn="http://purl.org/macgirvin/dfrn/1.0" 
+      xmlns:as="http://activitystrea.ms/spec/1.0/"
+      xmlns:georss="http://www.georss.org/georss" 
+      xmlns:poco="http://portablecontacts.net/spec/1.0" >
+EOT;
+
+	$slap = str_replace('<entry>',$namespaces,$slap);
+	
+	// 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'])));
+
+	// Setup RSA stuff to PKCS#1 sign the data
+
+	set_include_path(get_include_path() . PATH_SEPARATOR . 'phpsec');
+
+	require_once('phpsec/Crypt/RSA.php');
+
+    $rsa = new CRYPT_RSA();
+    $rsa->signatureMode = CRYPT_RSA_SIGNATURE_PKCS1;
+    $rsa->setHash('sha256');
+	$rsa->loadKey($owner['sprvkey']);
+
+	// precomputed base64url encoding of data_type, encoding, algorithm concatenated with periods
+
+	$precomputed = '.YXBwbGljYXRpb24vYXRvbSt4bWw=.YmFzZTY0dXJs.UlNBLVNIQTI1Ng==';
+
+	$signature  = base64url_encode($rsa->sign($data . $precomputed));
+
+	$signature2  = base64url_encode($rsa->sign($data));
+
+	$salmon_tpl = load_view_file('view/magicsig.tpl');
+	$salmon = replace_macros($salmon_tpl,array(
+		'$data'      => $data,
+		'$encoding'  => $encoding,
+		'$algorithm' => $algorithm,
+		'$keyhash'   => $keyhash,
+		'$signature' => $signature
+	));
+
+	// slap them 
+	post_url($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('slapper: compliant salmon failed. Falling back to status.net hack');
+
+		// Entirely likely that their salmon implementation is
+		// non-compliant. Let's try once more, this time only signing
+		// the data, without the precomputed blob 
+
+		$salmon = replace_macros($salmon_tpl,array(
+			'$data'      => $data,
+			'$encoding'  => $encoding,
+			'$algorithm' => $algorithm,
+			'$keyhash'   => $keyhash,
+			'$signature' => $signature2
+		));
+
+		// slap them 
+		post_url($url,$salmon, array(
+			'Content-type: application/magic-envelope+xml',
+			'Content-length: ' . strlen($salmon)
+		));
+		$return_code = $a->get_curl_code();
+
+	}
+	logger('slapper returned ' . $return_code); 
+	if(! $return_code)
+		return(-1);
+	return ((($return_code >= 200) && ($return_code < 300)) ? 0 : 1);
+}
+