X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=include%2Fsalmon.php;h=3d525f51ad36d0a2d55349937c140e404f8b56ea;hb=ea88e15a8cc10f99621720ca0e5a9598d0e64e0f;hp=7198f07c60a681923131dd9ea333dc0a85792866;hpb=013d2604f886bc7cbd2c5263d3577e8cf40f9fcc;p=friendica.git

diff --git a/include/salmon.php b/include/salmon.php
index 7198f07c60..6675849ce4 100644
--- a/include/salmon.php
+++ b/include/salmon.php
@@ -1,18 +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[] = $a['@attributes']['href'];
+			}
+		}
+	} else {
+		return '';
+	}
+
+	// We have found at least one key URL
+	// If it's inline, parse it - otherwise get the key
+
+	if (count($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]);
+			}
+		}
+	}
+
+
+	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, $slap) {
+
+	// does contact have a salmon endpoint?
+
+	if (! strlen($url)) {
+		return;
+	}
+
+	if (! $owner['sprvkey']) {
+		logger(sprintf("user '%s' (%d) does not have a salmon private key. Send failed.",
+		$owner['username'], $owner['uid']));
+		return;
+	}
+
+	logger('slapper called for '.$url.'. Data: ' . $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'])), 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 = $a->get_curl_code();
+	}
+
+	if ($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 = $a->get_curl_code();
+	}
+
+	logger('slapper for '.$url.' returned ' . $return_code);
+
+	if (! $return_code) {
+		return -1;
+	}
+
+	if (($return_code == 503) && (stristr($a->get_curl_headers(), 'retry-after'))) {
+		return -1;
+	}
+
+	return ((($return_code >= 200) && ($return_code < 300)) ? 0 : 1);
 }