235 lines
6.8 KiB
PHP
235 lines
6.8 KiB
PHP
<?php
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/**
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* @copyright Copyright (C) 2020, Friendica
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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namespace Friendica\Protocol;
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use Friendica\Core\Logger;
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use Friendica\Network\Probe;
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use Friendica\Util\Crypto;
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use Friendica\Util\Network;
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use Friendica\Util\Strings;
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use Friendica\Util\XML;
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/**
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* Salmon Protocol class
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*
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* The Salmon Protocol is a message exchange protocol running over HTTP designed to decentralize commentary
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* and annotations made against newsfeed articles such as blog posts.
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*/
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class Salmon
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{
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/**
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* @param string $uri Uniform Resource Identifier
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* @param string $keyhash encoded key
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* @return mixed
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
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public static function getKey($uri, $keyhash)
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{
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$ret = [];
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Logger::log('Fetching salmon key for '.$uri);
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$arr = Probe::lrdd($uri);
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if (is_array($arr)) {
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foreach ($arr as $a) {
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if ($a['@attributes']['rel'] === 'magic-public-key') {
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$ret[] = $a['@attributes']['href'];
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}
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}
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} else {
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return '';
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}
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// We have found at least one key URL
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// If it's inline, parse it - otherwise get the key
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if (count($ret) > 0) {
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for ($x = 0; $x < count($ret); $x ++) {
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if (substr($ret[$x], 0, 5) === 'data:') {
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if (strstr($ret[$x], ',')) {
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$ret[$x] = substr($ret[$x], strpos($ret[$x], ',') + 1);
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} else {
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$ret[$x] = substr($ret[$x], 5);
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}
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} elseif (Strings::normaliseLink($ret[$x]) == 'http://') {
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$ret[$x] = Network::fetchUrl($ret[$x]);
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}
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}
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}
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Logger::notice('Key located', ['ret' => $ret]);
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if (count($ret) == 1) {
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// We only found one one key so we don't care if the hash matches.
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// If it's the wrong key we'll find out soon enough because
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// message verification will fail. This also covers some older
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// software which don't supply a keyhash. As long as they only
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// have one key we'll be right.
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return $ret[0];
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} else {
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foreach ($ret as $a) {
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$hash = Strings::base64UrlEncode(hash('sha256', $a));
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if ($hash == $keyhash) {
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return $a;
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}
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}
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}
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return '';
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}
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/**
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* @param array $owner owner
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* @param string $url url
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* @param string $slap slap
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* @return integer
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* @throws \Friendica\Network\HTTPException\InternalServerErrorException
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*/
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public static function slapper($owner, $url, $slap)
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{
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// does contact have a salmon endpoint?
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if (!strlen($url)) {
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return;
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}
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if (!$owner['sprvkey']) {
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Logger::log(sprintf("user '%s' (%d) does not have a salmon private key. Send failed.",
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$owner['name'], $owner['uid']));
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return;
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}
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Logger::log('slapper called for '.$url.'. Data: ' . $slap);
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// create a magic envelope
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$data = Strings::base64UrlEncode($slap);
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$data_type = 'application/atom+xml';
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$encoding = 'base64url';
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$algorithm = 'RSA-SHA256';
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$keyhash = Strings::base64UrlEncode(hash('sha256', self::salmonKey($owner['spubkey'])), true);
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$precomputed = '.' . Strings::base64UrlEncode($data_type) . '.' . Strings::base64UrlEncode($encoding) . '.' . Strings::base64UrlEncode($algorithm);
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// GNU Social format
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$signature = Strings::base64UrlEncode(Crypto::rsaSign($data . $precomputed, $owner['sprvkey']));
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// Compliant format
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$signature2 = Strings::base64UrlEncode(Crypto::rsaSign(str_replace('=', '', $data . $precomputed), $owner['sprvkey']));
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// Old Status.net format
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$signature3 = Strings::base64UrlEncode(Crypto::rsaSign($data, $owner['sprvkey']));
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// At first try the non compliant method that works for GNU Social
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$xmldata = ["me:env" => ["me:data" => $data,
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"@attributes" => ["type" => $data_type],
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"me:encoding" => $encoding,
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"me:alg" => $algorithm,
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"me:sig" => $signature,
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"@attributes2" => ["key_id" => $keyhash]]];
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$namespaces = ["me" => "http://salmon-protocol.org/ns/magic-env"];
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$salmon = XML::fromArray($xmldata, $xml, false, $namespaces);
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// slap them
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$postResult = Network::post($url, $salmon, [
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'Content-type: application/magic-envelope+xml',
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'Content-length: ' . strlen($salmon)
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]);
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$return_code = $postResult->getReturnCode();
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// check for success, e.g. 2xx
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if ($return_code > 299) {
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Logger::log('GNU Social salmon failed. Falling back to compliant mode');
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// Now try the compliant mode that normally isn't used for GNU Social
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$xmldata = ["me:env" => ["me:data" => $data,
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"@attributes" => ["type" => $data_type],
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"me:encoding" => $encoding,
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"me:alg" => $algorithm,
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"me:sig" => $signature2,
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"@attributes2" => ["key_id" => $keyhash]]];
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$namespaces = ["me" => "http://salmon-protocol.org/ns/magic-env"];
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$salmon = XML::fromArray($xmldata, $xml, false, $namespaces);
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// slap them
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$postResult = Network::post($url, $salmon, [
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'Content-type: application/magic-envelope+xml',
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'Content-length: ' . strlen($salmon)
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]);
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$return_code = $postResult->getReturnCode();
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}
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if ($return_code > 299) {
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Logger::log('compliant salmon failed. Falling back to old status.net');
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// Last try. This will most likely fail as well.
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$xmldata = ["me:env" => ["me:data" => $data,
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"@attributes" => ["type" => $data_type],
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"me:encoding" => $encoding,
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"me:alg" => $algorithm,
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"me:sig" => $signature3,
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"@attributes2" => ["key_id" => $keyhash]]];
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$namespaces = ["me" => "http://salmon-protocol.org/ns/magic-env"];
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$salmon = XML::fromArray($xmldata, $xml, false, $namespaces);
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// slap them
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$postResult = Network::post($url, $salmon, [
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'Content-type: application/magic-envelope+xml',
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'Content-length: ' . strlen($salmon)]);
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$return_code = $postResult->getReturnCode();
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}
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Logger::log('slapper for '.$url.' returned ' . $return_code);
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if (! $return_code) {
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return -1;
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}
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if (($return_code == 503) && (stristr($postResult->getHeader(), 'retry-after'))) {
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return -1;
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}
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return (($return_code >= 200) && ($return_code < 300)) ? 0 : 1;
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}
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/**
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* @param string $pubkey public key
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* @return string
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* @throws \Exception
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*/
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public static function salmonKey($pubkey)
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{
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Crypto::pemToMe($pubkey, $m, $e);
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return 'RSA' . '.' . Strings::base64UrlEncode($m, true) . '.' . Strings::base64UrlEncode($e, true);
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}
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}
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