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[PLUGIN][ActivityPub][HTTPSignatures] Validate draft-cavage-http-signatures-11

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Diogo Peralta Cordeiro 2022-02-18 15:11:20 +00:00
parent 52ae5fa690
commit 7a59d5a002
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1 changed files with 15 additions and 2 deletions
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17
plugins/ActivityPub/Util/HTTPSignature.php
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@ -19,6 +19,7 @@ declare(strict_types = 1);
* @package Nautilus
*
* @author Aaron Parecki <aaron@parecki.com>
* @author Diogo Peralta Cordeiro <@diogo.site>
* @license http://www.apache.org/licenses/LICENSE-2.0 Apache License 2.0
*
* @see https://github.com/aaronpk/Nautilus/blob/master/app/ActivityPub/HTTPSignature.php
@ -142,11 +143,19 @@ class HTTPSignature
{
// We need this because the used Request headers fields specified by Signature are in lower case.
$headersContent = array_change_key_case($inputHeaders, \CASE_LOWER);
$digest = 'SHA-256=' . base64_encode(hash('sha256', $body, true));
if ($signatureData['algorithm'] == 'hs2019') {
$digest = 'SHA-512=' . base64_encode(hash('sha512', $body, true));
} else {
$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 == '(created)') {
$headersToSign[$h] = $signatureData['created'];
} elseif ($h == '(expires)') {
$headersToSign[$h] = $signatureData['expires'];
} elseif ($h == 'digest') {
$headersToSign[$h] = $digest;
} elseif (\array_key_exists($h, $headersContent)) {
@ -155,7 +164,11 @@ class HTTPSignature
}
$signingString = self::_headersToSigningString($headersToSign);
$verified = openssl_verify($signingString, base64_decode($signatureData['signature']), $publicKey, \OPENSSL_ALGO_SHA256);
if ($signatureData['algorithm'] == 'hs2019') {
$verified = openssl_verify($signingString, base64_decode($signatureData['signature']), $publicKey, \OPENSSL_ALGO_SHA512);
} else {
$verified = openssl_verify($signingString, base64_decode($signatureData['signature']), $publicKey, \OPENSSL_ALGO_SHA256);
}
return [$verified, $signingString];
}