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dirty proxy contract function injection hack

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This commit is contained in:
julian 2023-03-01 14:03:23 -06:00
parent e3548c5ecc
commit 508fc48462
1 changed files with 80 additions and 39 deletions
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119
lib/services/ethereum/ethereum_token_service.dart
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@ -1,4 +1,5 @@
import 'dart:async';
import 'dart:convert';
import 'package:decimal/decimal.dart';
import 'package:ethereum_addresses/ethereum_addresses.dart';
@ -109,37 +110,24 @@ class EthereumTokenService extends ChangeNotifier with EthTokenCache {
return await EthereumAPI.getFees();
}
Future<void> initializeExisting() async {
_tokenAbi = (await _secureStore.read(
key: '${_contractAddress.toString()}_tokenAbi'))!;
Future<void> initialize() async {
final storedABI =
await _secureStore.read(key: '${_contractAddress.toString()}_tokenAbi');
String? mnemonicString = await ethWallet.mnemonicString;
//Get private key for given mnemonic
String privateKey = getPrivateKey(
mnemonicString!, (await ethWallet.mnemonicPassphrase) ?? "");
_credentials = web3dart.EthPrivateKey.fromHex(privateKey);
_contract = web3dart.DeployedContract(
web3dart.ContractAbi.fromJson(_tokenAbi, token.name), _contractAddress);
_balanceFunction = _contract.function('balanceOf');
_sendFunction = _contract.function('transfer');
_client = await getEthClient();
unawaited(refresh());
}
Future<void> initializeNew() async {
AbiRequestResponse abi =
await EthereumAPI.fetchTokenAbi(_contractAddress.hex);
//Fetch token ABI so we can call token functions
if (abi.message == "OK") {
_tokenAbi = abi.result;
//Store abi in secure store
await _secureStore.write(
key: '${_contractAddress.hex}_tokenAbi', value: _tokenAbi);
if (storedABI == null) {
AbiRequestResponse abi =
await EthereumAPI.fetchTokenAbi(_contractAddress.hex);
//Fetch token ABI so we can call token functions
if (abi.message == "OK") {
_tokenAbi = abi.result;
//Store abi in secure store
await _secureStore.write(
key: '${_contractAddress.hex}_tokenAbi', value: _tokenAbi);
} else {
throw Exception('Failed to load token abi');
}
} else {
throw Exception('Failed to load token abi');
_tokenAbi = storedABI;
}
String? mnemonicString = await ethWallet.mnemonicString;
@ -151,8 +139,63 @@ class EthereumTokenService extends ChangeNotifier with EthTokenCache {
_contract = web3dart.DeployedContract(
web3dart.ContractAbi.fromJson(_tokenAbi, token.name), _contractAddress);
_balanceFunction = _contract.function('balanceOf');
_sendFunction = _contract.function('transfer');
bool hackInBalanceOf = false, hackInTransfer = false;
try {
_balanceFunction = _contract.function('balanceOf');
} catch (_) {
// function not found so likely a proxy so we need to hack the function in
hackInBalanceOf = true;
}
try {
_sendFunction = _contract.function('transfer');
} catch (_) {
// function not found so likely a proxy so we need to hack the function in
hackInTransfer = true;
}
if (hackInBalanceOf || hackInTransfer) {
final json = jsonDecode(_tokenAbi) as List;
if (hackInBalanceOf) {
json.add({
"constant": true,
"inputs": [
{"name": "", "type": "address"}
],
"name": "balanceOf",
"outputs": [
{"name": "", "type": "uint256"}
],
"payable": false,
"type": "function"
});
}
if (hackInTransfer) {
json.add({
"constant": false,
"inputs": [
{"name": "_to", "type": "address"},
{"name": "_value", "type": "uint256"}
],
"name": "transfer",
"outputs": <dynamic>[],
"payable": false,
"type": "function"
});
}
_tokenAbi = jsonEncode(json);
await _secureStore.write(
key: '${_contractAddress.hex}_tokenAbi', value: _tokenAbi);
_contract = web3dart.DeployedContract(
web3dart.ContractAbi.fromJson(_tokenAbi, token.name),
_contractAddress);
_balanceFunction = _contract.function('balanceOf');
_sendFunction = _contract.function('transfer');
}
_client = await getEthClient();
unawaited(refresh());
@ -228,13 +271,10 @@ class EthereumTokenService extends ChangeNotifier with EthTokenCache {
Future<void> refreshCachedBalance() async {
final balanceRequest = await _client.call(
contract: _contract,
function: _balanceFunction,
params: [_credentials.address]);
print("==========================================");
print("${token.name} balanceRequest: $balanceRequest");
print("==========================================");
contract: _contract,
function: _balanceFunction,
params: [_credentials.address],
);
String _balance = balanceRequest.first.toString();
@ -266,7 +306,8 @@ class EthereumTokenService extends ChangeNotifier with EthTokenCache {
);
if (response.value == null) {
throw Exception("Failed to fetch token transactions");
throw response.exception ??
Exception("Failed to fetch token transactions");
}
final List<Tuple2<Transaction, Address?>> txnsData = [];