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121 lines
3.6 KiB
PHP
121 lines
3.6 KiB
PHP
<?php
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namespace App\Util\ActivityPub;
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use Log;
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use App\Profile;
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use DateTime;
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class HttpSignature {
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/*
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* source: https://github.com/aaronpk/Nautilus/blob/master/app/ActivityPub/HTTPSignature.php
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* thanks aaronpk!
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*/
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public static function sign(Profile $profile, $url, $body = false, $addlHeaders = []) {
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if($body) {
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$digest = self::_digest($body);
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}
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$user = $profile;
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$headers = self::_headersToSign($url, $body ? $digest : false);
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$headers = array_merge($headers, $addlHeaders);
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$stringToSign = self::_headersToSigningString($headers);
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$signedHeaders = implode(' ', array_map('strtolower', array_keys($headers)));
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$key = openssl_pkey_get_private($user->private_key);
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openssl_sign($stringToSign, $signature, $key, OPENSSL_ALGO_SHA256);
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$signature = base64_encode($signature);
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$signatureHeader = 'keyId="'.$user->keyId().'",headers="'.$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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public static function parseSignatureHeader($signature) {
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$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, $body) {
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$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][0];
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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, $signingString];
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}
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private static function _headersToSigningString($headers) {
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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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return array_map(function($k, $v){
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return "$k: $v";
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}, array_keys($headers), $headers);
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}
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private static function _digest($body) {
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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, $digest = false) {
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$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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'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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}
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