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relayhub protection

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This commit is contained in:
Alexey 2019-09-26 18:46:49 +03:00
parent dee1c6140a
commit 926a4d7298
4 changed files with 15 additions and 7 deletions
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7
contracts/ETHMixer.sol
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@ -34,9 +34,12 @@ contract ETHMixer is GSNMixer {
require(msg.value == mixDenomination, "Please send `mixDenomination` ETH along with transaction");
}
event Debug(uint actualCharge, bytes context, address recipient);
// this func is called by RelayerHub right after calling a target func
function postRelayedCall(bytes memory context, bool /*success*/, uint actualCharge, bytes32 /*preRetVal*/) public onlyHub {
// this require allows to protect againt malicious relay hub that can drain the mixer
require(couldBeWithdrawn, "could be called only after withdrawViaRelayer");
couldBeWithdrawn = false;
IRelayHub relayHub = IRelayHub(getHubAddr());
address payable recipient;
uint256 nullifierHash;
@ -44,10 +47,10 @@ contract ETHMixer is GSNMixer {
recipient := mload(add(context, 32))
nullifierHash := mload(add(context, 64))
}
emit Debug(actualCharge, context, recipient);
recipient.transfer(mixDenomination - actualCharge);
relayHub.depositFor.value(actualCharge)(address(this));
emit Withdraw(recipient, nullifierHash, tx.origin, actualCharge);
}
}