mirror of
https://github.com/pixelfed/pixelfed.git
synced 2024-11-24 07:21:27 +00:00
122 lines
3.7 KiB
PHP
122 lines
3.7 KiB
PHP
<?php
|
|
|
|
namespace App\Util\ActivityPub;
|
|
|
|
use Log;
|
|
use App\Profile;
|
|
use \DateTime;
|
|
|
|
class HttpSignature {
|
|
|
|
/*
|
|
* source: https://github.com/aaronpk/Nautilus/blob/master/app/ActivityPub/HTTPSignature.php
|
|
* thanks aaronpk!
|
|
*/
|
|
|
|
public static function sign(Profile $profile, $url, $body = false, $addlHeaders = []) {
|
|
if($body) {
|
|
$digest = self::_digest($body);
|
|
}
|
|
$user = $profile;
|
|
$headers = self::_headersToSign($url, $body ? $digest : false);
|
|
$headers = array_merge($headers, $addlHeaders);
|
|
$stringToSign = self::_headersToSigningString($headers);
|
|
$signedHeaders = implode(' ', array_map('strtolower', array_keys($headers)));
|
|
$key = openssl_pkey_get_private($user->private_key);
|
|
openssl_sign($stringToSign, $signature, $key, OPENSSL_ALGO_SHA256);
|
|
$signature = base64_encode($signature);
|
|
$signatureHeader = 'keyId="'.$user->keyId().'",headers="'.$signedHeaders.'",algorithm="rsa-sha256",signature="'.$signature.'"';
|
|
unset($headers['(request-target)']);
|
|
$headers['Signature'] = $signatureHeader;
|
|
|
|
return self::_headersToCurlArray($headers);
|
|
}
|
|
|
|
public static function parseSignatureHeader($signature) {
|
|
$parts = explode(',', $signature);
|
|
$signatureData = [];
|
|
|
|
foreach($parts as $part) {
|
|
if(preg_match('/(.+)="(.+)"/', $part, $match)) {
|
|
$signatureData[$match[1]] = $match[2];
|
|
}
|
|
}
|
|
|
|
if(!isset($signatureData['keyId'])) {
|
|
return [
|
|
'error' => 'No keyId was found in the signature header. Found: '.implode(', ', array_keys($signatureData))
|
|
];
|
|
}
|
|
|
|
if(!filter_var($signatureData['keyId'], FILTER_VALIDATE_URL)) {
|
|
return [
|
|
'error' => 'keyId is not a URL: '.$signatureData['keyId']
|
|
];
|
|
}
|
|
|
|
if(!isset($signatureData['headers']) || !isset($signatureData['signature'])) {
|
|
return [
|
|
'error' => 'Signature is missing headers or signature parts'
|
|
];
|
|
}
|
|
|
|
return $signatureData;
|
|
}
|
|
|
|
public static function verify($publicKey, $signatureData, $inputHeaders, $path, $body) {
|
|
$digest = 'SHA-256='.base64_encode(hash('sha256', $body, true));
|
|
$headersToSign = [];
|
|
foreach(explode(' ',$signatureData['headers']) as $h) {
|
|
if($h == '(request-target)') {
|
|
$headersToSign[$h] = 'post '.$path;
|
|
} elseif($h == 'digest') {
|
|
$headersToSign[$h] = $digest;
|
|
} elseif(isset($inputHeaders[$h][0])) {
|
|
$headersToSign[$h] = $inputHeaders[$h][0];
|
|
}
|
|
}
|
|
$signingString = self::_headersToSigningString($headersToSign);
|
|
|
|
$verified = openssl_verify($signingString, base64_decode($signatureData['signature']), $publicKey, OPENSSL_ALGO_SHA256);
|
|
|
|
return [$verified, $signingString];
|
|
}
|
|
|
|
private static function _headersToSigningString($headers) {
|
|
return implode("\n", array_map(function($k, $v){
|
|
return strtolower($k).': '.$v;
|
|
}, array_keys($headers), $headers));
|
|
}
|
|
|
|
private static function _headersToCurlArray($headers) {
|
|
return array_map(function($k, $v){
|
|
return "$k: $v";
|
|
}, array_keys($headers), $headers);
|
|
}
|
|
|
|
private static function _digest($body) {
|
|
if(is_array($body)) {
|
|
$body = json_encode($body);
|
|
}
|
|
return base64_encode(hash('sha256', $body, true));
|
|
}
|
|
|
|
protected static function _headersToSign($url, $digest = false) {
|
|
$date = new DateTime('UTC');
|
|
|
|
$headers = [
|
|
'(request-target)' => 'post '.parse_url($url, PHP_URL_PATH),
|
|
'Date' => $date->format('D, d M Y H:i:s \G\M\T'),
|
|
'Host' => parse_url($url, PHP_URL_HOST),
|
|
'Accept' => 'application/activity+json, application/json',
|
|
'Content-Type' => 'application/activity+json'
|
|
];
|
|
|
|
if($digest) {
|
|
$headers['Digest'] = 'SHA-256='.$digest;
|
|
}
|
|
|
|
return $headers;
|
|
}
|
|
|
|
}
|