2ad4fa99ed
This is not the same as the one in https://notabug.org/diogo/gnu-social-activitypub-plugin Differences to the first "release" -> Doesn't use guzzle nor has any composer dependencies -> Supports HTTP Signatures -> Has basic l10n/i18n -> Some minor bug fixes
140 lines
5.0 KiB
PHP
140 lines
5.0 KiB
PHP
<?php
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/**
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* @category Network
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* @package Nautilus
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* @author Aaron Parecki <aaron@parecki.com>
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* @license http://www.apache.org/licenses/LICENSE-2.0 Apache License 2.0
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* @link https://github.com/aaronpk/Nautilus/blob/master/app/ActivityPub/HTTPSignature.php
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*/
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class HttpSignature
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{
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public static function sign($user, $url, $body = false, $addlHeaders = [])
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{
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$digest = false;
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if ($body) {
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$digest = self::_digest($body);
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}
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$headers = self::_headersToSign($url, $digest);
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$headers = array_merge($headers, $addlHeaders);
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$stringToSign = self::_headersToSigningString($headers);
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$signedHeaders = implode(' ', array_map('strtolower', array_keys($headers)));
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$actor_private_key = new Activitypub_rsa();
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$actor_private_key = $actor_private_key->get_private_key($user);
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$key = openssl_pkey_get_private($actor_private_key);
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openssl_sign($stringToSign, $signature, $key, OPENSSL_ALGO_SHA256);
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$signature = base64_encode($signature);
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$signatureHeader = 'keyId="' . ActivityPubPlugin::actor_uri($user).'#public-key' . '",headers="' . $signedHeaders . '",algorithm="rsa-sha256",signature="' . $signature . '"';
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unset($headers['(request-target)']);
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$headers['Signature'] = $signatureHeader;
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return self::_headersToCurlArray($headers);
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}
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private static function _digest($body)
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{
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if (is_array($body)) {
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$body = json_encode($body);
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}
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return base64_encode(hash('sha256', $body, true));
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}
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protected static function _headersToSign($url, $digest = false)
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{
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$date = new DateTime('UTC');
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$headers = [
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'(request-target)' => 'post ' . parse_url($url, PHP_URL_PATH),
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'Date' => $date->format('D, d M Y H:i:s \G\M\T'),
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'Host' => parse_url($url, PHP_URL_HOST),
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'Accept' => 'application/ld+json; profile="https://www.w3.org/ns/activitystreams", application/activity+json, application/json',
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'User-Agent' => 'GNU social ActivityPub Plugin - https://gnu.io/social',
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'Content-Type' => 'application/activity+json'
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];
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if ($digest) {
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$headers['Digest'] = 'SHA-256=' . $digest;
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}
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return $headers;
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}
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private static function _headersToSigningString($headers)
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{
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return implode("\n", array_map(function ($k, $v) {
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return strtolower($k) . ': ' . $v;
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}, array_keys($headers), $headers));
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}
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private static function _headersToCurlArray($headers)
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{
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return array_map(function ($k, $v) {
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return "$k: $v";
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}, array_keys($headers), $headers);
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}
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public static function parseSignatureHeader($signature)
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{
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$parts = explode(',', $signature);
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$signatureData = [];
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foreach ($parts as $part) {
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if (preg_match('/(.+)="(.+)"/', $part, $match)) {
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$signatureData[$match[1]] = $match[2];
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}
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}
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if (!isset($signatureData['keyId'])) {
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return [
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'error' => 'No keyId was found in the signature header. Found: ' . implode(', ', array_keys($signatureData))
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];
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}
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if (!filter_var($signatureData['keyId'], FILTER_VALIDATE_URL)) {
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return [
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'error' => 'keyId is not a URL: ' . $signatureData['keyId']
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];
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}
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if (!isset($signatureData['headers']) || !isset($signatureData['signature'])) {
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return [
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'error' => 'Signature is missing headers or signature parts'
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];
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}
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return $signatureData;
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}
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public static function verify($publicKey, $signatureData, $inputHeaders, $path, $body)
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{
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$digest = 'SHA-256=' . base64_encode(hash('sha256', $body, true));
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$headersToSign = [];
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foreach (explode(' ', $signatureData['headers']) as $h) {
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if ($h == '(request-target)') {
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$headersToSign[$h] = 'post ' . $path;
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} elseif ($h == 'digest') {
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$headersToSign[$h] = $digest;
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} elseif (isset($inputHeaders[$h][0])) {
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$headersToSign[$h] = $inputHeaders[$h];
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}
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}
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$signingString = self::_headersToSigningString($headersToSign);
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$verified = openssl_verify($signingString, base64_decode($signatureData['signature']), $publicKey, OPENSSL_ALGO_SHA256);
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return [$verified, $signingString];
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}
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}
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