<?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);
}
projects / friendica.git / blobdiff