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Diffstat (limited to 'packages/contracts/src/2.0.0/protocol/Exchange/MixinSignatureValidator.sol')
| -rw-r--r-- | packages/contracts/src/2.0.0/protocol/Exchange/MixinSignatureValidator.sol | 324 |
1 files changed, 0 insertions, 324 deletions
diff --git a/packages/contracts/src/2.0.0/protocol/Exchange/MixinSignatureValidator.sol b/packages/contracts/src/2.0.0/protocol/Exchange/MixinSignatureValidator.sol deleted file mode 100644 index 176e28351..000000000 --- a/packages/contracts/src/2.0.0/protocol/Exchange/MixinSignatureValidator.sol +++ /dev/null @@ -1,324 +0,0 @@ -/* - - Copyright 2018 ZeroEx Intl. - - Licensed under the Apache License, Version 2.0 (the "License"); - you may not use this file except in compliance with the License. - You may obtain a copy of the License at - - http://www.apache.org/licenses/LICENSE-2.0 - - Unless required by applicable law or agreed to in writing, software - distributed under the License is distributed on an "AS IS" BASIS, - WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - See the License for the specific language governing permissions and - limitations under the License. - -*/ - -pragma solidity 0.4.24; - -import "../../utils/LibBytes/LibBytes.sol"; -import "../../utils/ReentrancyGuard/ReentrancyGuard.sol"; -import "./mixins/MSignatureValidator.sol"; -import "./mixins/MTransactions.sol"; -import "./interfaces/IWallet.sol"; -import "./interfaces/IValidator.sol"; - - -contract MixinSignatureValidator is - ReentrancyGuard, - MSignatureValidator, - MTransactions -{ - using LibBytes for bytes; - - // Mapping of hash => signer => signed - mapping (bytes32 => mapping (address => bool)) public preSigned; - - // Mapping of signer => validator => approved - mapping (address => mapping (address => bool)) public allowedValidators; - - /// @dev Approves a hash on-chain using any valid signature type. - /// After presigning a hash, the preSign signature type will become valid for that hash and signer. - /// @param signerAddress Address that should have signed the given hash. - /// @param signature Proof that the hash has been signed by signer. - function preSign( - bytes32 hash, - address signerAddress, - bytes signature - ) - external - { - if (signerAddress != msg.sender) { - require( - isValidSignature( - hash, - signerAddress, - signature - ), - "INVALID_SIGNATURE" - ); - } - preSigned[hash][signerAddress] = true; - } - - /// @dev Approves/unnapproves a Validator contract to verify signatures on signer's behalf. - /// @param validatorAddress Address of Validator contract. - /// @param approval Approval or disapproval of Validator contract. - function setSignatureValidatorApproval( - address validatorAddress, - bool approval - ) - external - nonReentrant - { - address signerAddress = getCurrentContextAddress(); - allowedValidators[signerAddress][validatorAddress] = approval; - emit SignatureValidatorApproval( - signerAddress, - validatorAddress, - approval - ); - } - - /// @dev Verifies that a hash has been signed by the given signer. - /// @param hash Any 32 byte hash. - /// @param signerAddress Address that should have signed the given hash. - /// @param signature Proof that the hash has been signed by signer. - /// @return True if the address recovered from the provided signature matches the input signer address. - function isValidSignature( - bytes32 hash, - address signerAddress, - bytes memory signature - ) - public - view - returns (bool isValid) - { - require( - signature.length > 0, - "LENGTH_GREATER_THAN_0_REQUIRED" - ); - - // Pop last byte off of signature byte array. - uint8 signatureTypeRaw = uint8(signature.popLastByte()); - - // Ensure signature is supported - require( - signatureTypeRaw < uint8(SignatureType.NSignatureTypes), - "SIGNATURE_UNSUPPORTED" - ); - - SignatureType signatureType = SignatureType(signatureTypeRaw); - - // Variables are not scoped in Solidity. - uint8 v; - bytes32 r; - bytes32 s; - address recovered; - - // Always illegal signature. - // This is always an implicit option since a signer can create a - // signature array with invalid type or length. We may as well make - // it an explicit option. This aids testing and analysis. It is - // also the initialization value for the enum type. - if (signatureType == SignatureType.Illegal) { - revert("SIGNATURE_ILLEGAL"); - - // Always invalid signature. - // Like Illegal, this is always implicitly available and therefore - // offered explicitly. It can be implicitly created by providing - // a correctly formatted but incorrect signature. - } else if (signatureType == SignatureType.Invalid) { - require( - signature.length == 0, - "LENGTH_0_REQUIRED" - ); - isValid = false; - return isValid; - - // Signature using EIP712 - } else if (signatureType == SignatureType.EIP712) { - require( - signature.length == 65, - "LENGTH_65_REQUIRED" - ); - v = uint8(signature[0]); - r = signature.readBytes32(1); - s = signature.readBytes32(33); - recovered = ecrecover( - hash, - v, - r, - s - ); - isValid = signerAddress == recovered; - return isValid; - - // Signed using web3.eth_sign - } else if (signatureType == SignatureType.EthSign) { - require( - signature.length == 65, - "LENGTH_65_REQUIRED" - ); - v = uint8(signature[0]); - r = signature.readBytes32(1); - s = signature.readBytes32(33); - recovered = ecrecover( - keccak256(abi.encodePacked( - "\x19Ethereum Signed Message:\n32", - hash - )), - v, - r, - s - ); - isValid = signerAddress == recovered; - return isValid; - - // Signature verified by wallet contract. - // If used with an order, the maker of the order is the wallet contract. - } else if (signatureType == SignatureType.Wallet) { - isValid = isValidWalletSignature( - hash, - signerAddress, - signature - ); - return isValid; - - // Signature verified by validator contract. - // If used with an order, the maker of the order can still be an EOA. - // A signature using this type should be encoded as: - // | Offset | Length | Contents | - // | 0x00 | x | Signature to validate | - // | 0x00 + x | 20 | Address of validator contract | - // | 0x14 + x | 1 | Signature type is always "\x06" | - } else if (signatureType == SignatureType.Validator) { - // Pop last 20 bytes off of signature byte array. - address validatorAddress = signature.popLast20Bytes(); - - // Ensure signer has approved validator. - if (!allowedValidators[signerAddress][validatorAddress]) { - return false; - } - isValid = isValidValidatorSignature( - validatorAddress, - hash, - signerAddress, - signature - ); - return isValid; - - // Signer signed hash previously using the preSign function. - } else if (signatureType == SignatureType.PreSigned) { - isValid = preSigned[hash][signerAddress]; - return isValid; - } - - // Anything else is illegal (We do not return false because - // the signature may actually be valid, just not in a format - // that we currently support. In this case returning false - // may lead the caller to incorrectly believe that the - // signature was invalid.) - revert("SIGNATURE_UNSUPPORTED"); - } - - /// @dev Verifies signature using logic defined by Wallet contract. - /// @param hash Any 32 byte hash. - /// @param walletAddress Address that should have signed the given hash - /// and defines its own signature verification method. - /// @param signature Proof that the hash has been signed by signer. - /// @return True if signature is valid for given wallet.. - function isValidWalletSignature( - bytes32 hash, - address walletAddress, - bytes signature - ) - internal - view - returns (bool isValid) - { - bytes memory calldata = abi.encodeWithSelector( - IWallet(walletAddress).isValidSignature.selector, - hash, - signature - ); - assembly { - let cdStart := add(calldata, 32) - let success := staticcall( - gas, // forward all gas - walletAddress, // address of Wallet contract - cdStart, // pointer to start of input - mload(calldata), // length of input - cdStart, // write output over input - 32 // output size is 32 bytes - ) - - switch success - case 0 { - // Revert with `Error("WALLET_ERROR")` - mstore(0, 0x08c379a000000000000000000000000000000000000000000000000000000000) - mstore(32, 0x0000002000000000000000000000000000000000000000000000000000000000) - mstore(64, 0x0000000c57414c4c45545f4552524f5200000000000000000000000000000000) - mstore(96, 0) - revert(0, 100) - } - case 1 { - // Signature is valid if call did not revert and returned true - isValid := mload(cdStart) - } - } - return isValid; - } - - /// @dev Verifies signature using logic defined by Validator contract. - /// @param validatorAddress Address of validator contract. - /// @param hash Any 32 byte hash. - /// @param signerAddress Address that should have signed the given hash. - /// @param signature Proof that the hash has been signed by signer. - /// @return True if the address recovered from the provided signature matches the input signer address. - function isValidValidatorSignature( - address validatorAddress, - bytes32 hash, - address signerAddress, - bytes signature - ) - internal - view - returns (bool isValid) - { - bytes memory calldata = abi.encodeWithSelector( - IValidator(signerAddress).isValidSignature.selector, - hash, - signerAddress, - signature - ); - assembly { - let cdStart := add(calldata, 32) - let success := staticcall( - gas, // forward all gas - validatorAddress, // address of Validator contract - cdStart, // pointer to start of input - mload(calldata), // length of input - cdStart, // write output over input - 32 // output size is 32 bytes - ) - - switch success - case 0 { - // Revert with `Error("VALIDATOR_ERROR")` - mstore(0, 0x08c379a000000000000000000000000000000000000000000000000000000000) - mstore(32, 0x0000002000000000000000000000000000000000000000000000000000000000) - mstore(64, 0x0000000f56414c494441544f525f4552524f5200000000000000000000000000) - mstore(96, 0) - revert(0, 100) - } - case 1 { - // Signature is valid if call did not revert and returned true - isValid := mload(cdStart) - } - } - return isValid; - } -} |