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ProcessLoginTask: properly cater for key parsing errors

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This commit is contained in:
Dylan K. Taylor 2020-05-13 19:23:01 +01:00
parent bbc249ff0d
commit 161ac468f3
1 changed files with 14 additions and 2 deletions
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16
src/network/mcpe/auth/ProcessLoginTask.php
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@ -23,6 +23,7 @@ declare(strict_types=1);
namespace pocketmine\network\mcpe\auth;
use FG\ASN1\Exception\ParserException;
use Mdanter\Ecc\Crypto\Key\PublicKeyInterface;
use Mdanter\Ecc\Crypto\Signature\Signature;
use Mdanter\Ecc\Serializer\PublicKey\DerPublicKeySerializer;
@ -34,6 +35,7 @@ use pocketmine\scheduler\AsyncTask;
use pocketmine\utils\AssumptionFailedError;
use function base64_decode;
use function bin2hex;
use function count;
use function explode;
use function gmp_init;
use function openssl_verify;
@ -136,13 +138,23 @@ class ProcessLoginTask extends AsyncTask{
[$rString, $sString] = str_split($plainSignature, 48);
$sig = new Signature(gmp_init(bin2hex($rString), 16), gmp_init(bin2hex($sString), 16));
$derPublicKeySerializer = new DerPublicKeySerializer();
$rawPublicKey = base64_decode($currentPublicKey, true);
if($rawPublicKey === false){
throw new VerifyLoginException("Failed to decode base64'd public key");
}
try{
$signingKey = $derPublicKeySerializer->parse($rawPublicKey);
}catch(\RuntimeException | ParserException $e){
throw new VerifyLoginException("Failed to parse DER public key: " . $e->getMessage(), 0, $e);
}
$rawParts = explode('.', $jwt);
if(count($rawParts) !== 3) throw new AssumptionFailedError("Parts count should be 3 as verified by JwtUtils::parse()");
$derSerializer = new DerPublicKeySerializer();
$v = openssl_verify(
$rawParts[0] . '.' . $rawParts[1],
(new DerSignatureSerializer())->serialize($sig),
(new PemPublicKeySerializer($derSerializer))->serialize($derSerializer->parse(base64_decode($currentPublicKey, true))),
(new PemPublicKeySerializer($derPublicKeySerializer))->serialize($signingKey),
OPENSSL_ALGO_SHA384
);