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Harden login EC key validation

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This commit is contained in:
Dylan K. Taylor 2023-07-14 11:55:47 +01:00
parent 2a11762e61
commit 4e646d19a4
No known key found for this signature in database
GPG Key ID: 8927471A91CAFD3D
3 changed files with 34 additions and 2 deletions
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12
src/network/mcpe/JwtUtils.php
View File

@ -61,6 +61,7 @@ use const OPENSSL_ALGO_SHA384;
use const STR_PAD_LEFT;
final class JwtUtils{
public const BEDROCK_SIGNING_KEY_CURVE_NAME = "secp384r1";
/**
* @return string[]
@ -203,6 +204,17 @@ final class JwtUtils{
if($signingKeyOpenSSL === false){
throw new JwtException("OpenSSL failed to parse key: " . openssl_error_string());
}
$details = openssl_pkey_get_details($signingKeyOpenSSL);
if($details === false){
throw new JwtException("OpenSSL failed to get details from key: " . openssl_error_string());
}
if(!isset($details['ec']['curve_name'])){
throw new JwtException("Expected an EC key");
}
$curve = $details['ec']['curve_name'];
if($curve !== self::BEDROCK_SIGNING_KEY_CURVE_NAME){
throw new JwtException("Key must belong to curve " . self::BEDROCK_SIGNING_KEY_CURVE_NAME . ", got $curve");
}
return $signingKeyOpenSSL;
}
}

10
src/network/mcpe/auth/ProcessLoginTask.php
View File

@ -32,7 +32,6 @@ use pocketmine\scheduler\AsyncTask;
use function base64_decode;
use function igbinary_serialize;
use function igbinary_unserialize;
use function openssl_error_string;
use function time;
class ProcessLoginTask extends AsyncTask{
@ -156,7 +155,8 @@ class ProcessLoginTask extends AsyncTask{
try{
$signingKeyOpenSSL = JwtUtils::parseDerPublicKey($headerDerKey);
}catch(JwtException $e){
throw new VerifyLoginException("Invalid JWT public key: " . openssl_error_string());
//TODO: we shouldn't be showing this internal information to the client
throw new VerifyLoginException("Invalid JWT public key: " . $e->getMessage(), null, 0, $e);
}
try{
if(!JwtUtils::verify($jwt, $signingKeyOpenSSL)){
@ -196,6 +196,12 @@ class ProcessLoginTask extends AsyncTask{
if($identityPublicKey === false){
throw new VerifyLoginException("Invalid identityPublicKey: base64 error decoding");
}
try{
//verify key format and parameters
JwtUtils::parseDerPublicKey($identityPublicKey);
}catch(JwtException $e){
throw new VerifyLoginException("Invalid identityPublicKey: " . $e->getMessage(), null, 0, $e);
}
$currentPublicKey = $identityPublicKey; //if there are further links, the next link should be signed with this
}
}

14
src/network/mcpe/encryption/EncryptionUtils.php
View File

@ -33,6 +33,7 @@ use function hex2bin;
use function openssl_digest;
use function openssl_error_string;
use function openssl_pkey_derive;
use function openssl_pkey_get_details;
use function str_pad;
use const STR_PAD_LEFT;
@ -42,7 +43,20 @@ final class EncryptionUtils{
//NOOP
}
private static function validateKey(\OpenSSLAsymmetricKey $key) : void{
$keyDetails = Utils::assumeNotFalse(openssl_pkey_get_details($key));
if(!isset($keyDetails["ec"]["curve_name"])){
throw new \InvalidArgumentException("Key must be an EC key");
}
$curveName = $keyDetails["ec"]["curve_name"];
if($curveName !== JwtUtils::BEDROCK_SIGNING_KEY_CURVE_NAME){
throw new \InvalidArgumentException("Key must belong to the " . JwtUtils::BEDROCK_SIGNING_KEY_CURVE_NAME . " elliptic curve, got $curveName");
}
}
public static function generateSharedSecret(\OpenSSLAsymmetricKey $localPriv, \OpenSSLAsymmetricKey $remotePub) : \GMP{
self::validateKey($localPriv);
self::validateKey($remotePub);
$hexSecret = openssl_pkey_derive($remotePub, $localPriv, 48);
if($hexSecret === false){
throw new \InvalidArgumentException("Failed to derive shared secret: " . openssl_error_string());