{ "contractName": "Penalizer", "abi": [ { "inputs": [], "name": "versionPenalizer", "outputs": [ { "internalType": "string", "name": "", "type": "string" } ], "stateMutability": "view", "type": "function" }, { "inputs": [ { "internalType": "bytes", "name": "unsignedTx1", "type": "bytes" }, { "internalType": "bytes", "name": "signature1", "type": "bytes" }, { "internalType": "bytes", "name": "unsignedTx2", "type": "bytes" }, { "internalType": "bytes", "name": "signature2", "type": "bytes" }, { "internalType": "contract IRelayHub", "name": "hub", "type": "address" } ], "name": "penalizeRepeatedNonce", "outputs": [], "stateMutability": "nonpayable", "type": "function" }, { "inputs": [ { "internalType": "bytes", "name": "unsignedTx", "type": "bytes" }, { "internalType": "bytes", "name": "signature", "type": "bytes" }, { "internalType": "contract IRelayHub", "name": "hub", "type": "address" } ], "name": "penalizeIllegalTransaction", "outputs": [], "stateMutability": "nonpayable", "type": "function" } ], "metadata": "{\"compiler\":{\"version\":\"0.6.10+commit.00c0fcaf\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[{\"internalType\":\"bytes\",\"name\":\"unsignedTx\",\"type\":\"bytes\"},{\"internalType\":\"bytes\",\"name\":\"signature\",\"type\":\"bytes\"},{\"internalType\":\"contract IRelayHub\",\"name\":\"hub\",\"type\":\"address\"}],\"name\":\"penalizeIllegalTransaction\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"bytes\",\"name\":\"unsignedTx1\",\"type\":\"bytes\"},{\"internalType\":\"bytes\",\"name\":\"signature1\",\"type\":\"bytes\"},{\"internalType\":\"bytes\",\"name\":\"unsignedTx2\",\"type\":\"bytes\"},{\"internalType\":\"bytes\",\"name\":\"signature2\",\"type\":\"bytes\"},{\"internalType\":\"contract 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"source": "// SPDX-License-Identifier:MIT\npragma solidity ^0.6.2;\npragma experimental ABIEncoderV2;\n\nimport \"@openzeppelin/contracts/cryptography/ECDSA.sol\";\n\nimport \"./utils/RLPReader.sol\";\nimport \"./utils/GsnUtils.sol\";\nimport \"./interfaces/IRelayHub.sol\";\nimport \"./interfaces/IPenalizer.sol\";\n\ncontract Penalizer is IPenalizer{\n\n string public override versionPenalizer = \"2.0.0+opengsn.penalizer.ipenalizer\";\n\n using ECDSA for bytes32;\n\n function decodeTransaction(bytes memory rawTransaction) private pure returns (Transaction memory transaction) {\n (transaction.nonce,\n transaction.gasPrice,\n transaction.gasLimit,\n transaction.to,\n transaction.value,\n transaction.data) = RLPReader.decodeTransaction(rawTransaction);\n return transaction;\n\n }\n\n modifier relayManagerOnly(IRelayHub hub) {\n require(hub.isRelayManagerStaked(msg.sender), \"Unknown relay manager\");\n _;\n }\n\n function penalizeRepeatedNonce(\n bytes memory unsignedTx1,\n bytes memory signature1,\n bytes memory unsignedTx2,\n bytes memory signature2,\n IRelayHub hub\n )\n public\n override\n relayManagerOnly(hub)\n {\n // Can be called by a relay manager only.\n // If a relay attacked the system by signing multiple transactions with the same nonce\n // (so only one is accepted), anyone can grab both transactions from the blockchain and submit them here.\n // Check whether unsignedTx1 != unsignedTx2, that both are signed by the same address,\n // and that unsignedTx1.nonce == unsignedTx2.nonce.\n // If all conditions are met, relay is considered an \"offending relay\".\n // The offending relay will be unregistered immediately, its stake will be forfeited and given\n // to the address who reported it (msg.sender), thus incentivizing anyone to report offending relays.\n // If reported via a relay, the forfeited stake is split between\n // msg.sender (the relay used for reporting) and the address that reported it.\n\n address addr1 = keccak256(abi.encodePacked(unsignedTx1)).recover(signature1);\n address addr2 = keccak256(abi.encodePacked(unsignedTx2)).recover(signature2);\n\n require(addr1 == addr2, \"Different signer\");\n require(addr1 != address(0), \"ecrecover failed\");\n\n Transaction memory decodedTx1 = decodeTransaction(unsignedTx1);\n Transaction memory decodedTx2 = decodeTransaction(unsignedTx2);\n\n // checking that the same nonce is used in both transaction, with both signed by the same address\n // and the actual data is different\n // note: we compare the hash of the tx to save gas over iterating both byte arrays\n require(decodedTx1.nonce == decodedTx2.nonce, \"Different nonce\");\n\n bytes memory dataToCheck1 =\n abi.encodePacked(decodedTx1.data, decodedTx1.gasLimit, decodedTx1.to, decodedTx1.value);\n\n bytes memory dataToCheck2 =\n abi.encodePacked(decodedTx2.data, decodedTx2.gasLimit, decodedTx2.to, decodedTx2.value);\n\n require(keccak256(dataToCheck1) != keccak256(dataToCheck2), \"tx is 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