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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,21 +1,15 @@ | ||
| // SPDX-License-Identifier: LGPL-3.0-only | ||
| /* solhint-disable one-contract-per-file */ | ||
| pragma solidity >=0.8.0; | ||
|
|
||
| import {SignatureValidatorConstants} from "./SignatureValidatorConstants.sol"; | ||
| import {ICustom256BitECSignerFactory} from "./interfaces/ICustomSignerFactory.sol"; | ||
| import {SignatureValidator} from "./SignatureValidator.sol"; | ||
| import {IWebAuthnVerifier, WebAuthnConstants} from "./verifiers/WebAuthnVerifier.sol"; | ||
|
|
||
| struct SignatureData { | ||
| bytes authenticatorData; | ||
| bytes clientDataFields; | ||
| uint256[2] rs; | ||
| } | ||
| import {SignatureValidator} from "./base/SignatureValidator.sol"; | ||
| import {IWebAuthnVerifier} from "./interfaces/IWebAuthnVerifier.sol"; | ||
| import {WebAuthnFlags} from "./libraries/WebAuthnFlags.sol"; | ||
| import {WebAuthnSignature} from "./libraries/WebAuthnSignature.sol"; | ||
|
|
||
| /** | ||
| * @title WebAuthnSigner | ||
| * @title WebAuthn Safe Signature Validator | ||
| * @dev A contract that represents a WebAuthn signer. | ||
| * @custom:security-contact [email protected] | ||
| */ | ||
| contract WebAuthnSigner is SignatureValidator { | ||
| uint256 public immutable X; | ||
|
|
@@ -38,114 +32,18 @@ contract WebAuthnSigner is SignatureValidator { | |
| * @inheritdoc SignatureValidator | ||
| */ | ||
| function _verifySignature(bytes32 message, bytes calldata signature) internal view virtual override returns (bool isValid) { | ||
| SignatureData calldata signaturePointer; | ||
| // solhint-disable-next-line no-inline-assembly | ||
| assembly ("memory-safe") { | ||
| signaturePointer := signature.offset | ||
| } | ||
| WebAuthnSignature.Data calldata data = WebAuthnSignature.cast(signature); | ||
|
|
||
| return | ||
| WEBAUTHN_SIG_VERIFIER.verifyWebAuthnSignatureAllowMalleability( | ||
| signaturePointer.authenticatorData, | ||
| WebAuthnConstants.AUTH_DATA_FLAGS_UV, | ||
| data.authenticatorData, | ||
| WebAuthnFlags.USER_VERIFICATION, | ||
| message, | ||
| signaturePointer.clientDataFields, | ||
| signaturePointer.rs, | ||
| data.clientDataFields, | ||
| data.r, | ||
| data.s, | ||
| X, | ||
| Y | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * @title WebAuthnSignerFactory | ||
| * @dev A factory contract for creating and managing WebAuthn signers. | ||
| */ | ||
| contract WebAuthnSignerFactory is ICustom256BitECSignerFactory, SignatureValidatorConstants { | ||
| // @inheritdoc ICustom256BitECSignerFactory | ||
| function getSigner(uint256 qx, uint256 qy, address verifier) public view override returns (address signer) { | ||
| bytes32 codeHash = keccak256(abi.encodePacked(type(WebAuthnSigner).creationCode, qx, qy, uint256(uint160(verifier)))); | ||
| signer = address(uint160(uint256(keccak256(abi.encodePacked(hex"ff", address(this), bytes32(0), codeHash))))); | ||
| } | ||
|
|
||
| // @inheritdoc ICustom256BitECSignerFactory | ||
| function createSigner(uint256 qx, uint256 qy, address verifier) external returns (address signer) { | ||
| signer = getSigner(qx, qy, verifier); | ||
|
|
||
| if (_hasNoCode(signer) && _validVerifier(verifier)) { | ||
| WebAuthnSigner created = new WebAuthnSigner{salt: bytes32(0)}(qx, qy, verifier); | ||
| require(address(created) == signer); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * @dev Checks if the given verifier address contains code. | ||
| * @param verifier The address of the verifier to check. | ||
| * @return A boolean indicating whether the verifier contains code or not. | ||
| */ | ||
| function _validVerifier(address verifier) internal view returns (bool) { | ||
| // The verifier should contain code (The only way to implement a webauthn verifier is with a smart contract) | ||
| return !_hasNoCode(verifier); | ||
| } | ||
|
|
||
| // @inheritdoc ICustom256BitECSignerFactory | ||
| function isValidSignatureForSigner( | ||
| uint256 qx, | ||
| uint256 qy, | ||
| address verifier, | ||
| bytes32 message, | ||
| bytes calldata signature | ||
| ) external view override returns (bytes4 magicValue) { | ||
| if (checkSignature(verifier, message, signature, qx, qy)) { | ||
| magicValue = EIP1271_MAGIC_VALUE; | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * @dev Checks if the provided account has no code. | ||
| * @param account The address of the account to check. | ||
| * @return True if the account has no code, false otherwise. | ||
| */ | ||
| function _hasNoCode(address account) internal view returns (bool) { | ||
| uint256 size; | ||
| // solhint-disable-next-line no-inline-assembly | ||
| assembly ("memory-safe") { | ||
| size := extcodesize(account) | ||
| } | ||
| return size == 0; | ||
| } | ||
|
|
||
| /** | ||
| * @dev Checks the validity of a signature using WebAuthnVerifier. | ||
| * @param verifier The address of the WebAuthnVerifier contract. | ||
| * @param dataHash The hash of the data being signed. | ||
| * @param signature The signature to be verified. | ||
| * @param qx The x-coordinate of the public key. | ||
| * @param qy The y-coordinate of the public key. | ||
| * @return A boolean indicating whether the signature is valid or not. | ||
| */ | ||
| function checkSignature( | ||
| address verifier, | ||
| bytes32 dataHash, | ||
| bytes calldata signature, | ||
| uint256 qx, | ||
| uint256 qy | ||
| ) internal view returns (bool) { | ||
| SignatureData calldata signaturePointer; | ||
| // solhint-disable-next-line no-inline-assembly | ||
| assembly ("memory-safe") { | ||
| signaturePointer := signature.offset | ||
| } | ||
|
|
||
| return | ||
| IWebAuthnVerifier(verifier).verifyWebAuthnSignatureAllowMalleability( | ||
| signaturePointer.authenticatorData, | ||
| WebAuthnConstants.AUTH_DATA_FLAGS_UV, | ||
| dataHash, | ||
| signaturePointer.clientDataFields, | ||
| signaturePointer.rs, | ||
| qx, | ||
| qy | ||
| ); | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| // SPDX-License-Identifier: LGPL-3.0-only | ||
| pragma solidity >=0.8.0; | ||
|
|
||
| import {ICustom256BitECSignerFactory} from "./interfaces/ICustomSignerFactory.sol"; | ||
| import {IWebAuthnVerifier} from "./interfaces/IWebAuthnVerifier.sol"; | ||
| import {ERC1271} from "./libraries/ERC1271.sol"; | ||
| import {WebAuthnFlags} from "./libraries/WebAuthnFlags.sol"; | ||
| import {WebAuthnSignature} from "./libraries/WebAuthnSignature.sol"; | ||
| import {WebAuthnSigner} from "./WebAuthnSigner.sol"; | ||
|
|
||
| /** | ||
| * @title WebAuthnSignerFactory | ||
| * @dev A factory contract for creating and managing WebAuthn signers. | ||
| */ | ||
| contract WebAuthnSignerFactory is ICustom256BitECSignerFactory { | ||
| // @inheritdoc ICustom256BitECSignerFactory | ||
| function getSigner(uint256 qx, uint256 qy, address verifier) public view override returns (address signer) { | ||
| bytes32 codeHash = keccak256(abi.encodePacked(type(WebAuthnSigner).creationCode, qx, qy, uint256(uint160(verifier)))); | ||
| signer = address(uint160(uint256(keccak256(abi.encodePacked(hex"ff", address(this), bytes32(0), codeHash))))); | ||
| } | ||
|
|
||
| // @inheritdoc ICustom256BitECSignerFactory | ||
| function createSigner(uint256 qx, uint256 qy, address verifier) external returns (address signer) { | ||
| signer = getSigner(qx, qy, verifier); | ||
|
|
||
| if (_hasNoCode(signer) && _validVerifier(verifier)) { | ||
| WebAuthnSigner created = new WebAuthnSigner{salt: bytes32(0)}(qx, qy, verifier); | ||
| require(address(created) == signer); | ||
| } | ||
| } | ||
|
|
||
| // @inheritdoc ICustom256BitECSignerFactory | ||
| function isValidSignatureForSigner( | ||
| uint256 qx, | ||
| uint256 qy, | ||
| address verifier, | ||
| bytes32 message, | ||
| bytes calldata signature | ||
| ) external view override returns (bytes4 magicValue) { | ||
| WebAuthnSignature.Data calldata data = WebAuthnSignature.cast(signature); | ||
|
|
||
| // Work around stack-too-deep issues by helping out the compiler figure out how to re-order | ||
| // the stack. | ||
| uint256 x = qx; | ||
| uint256 y = qy; | ||
|
|
||
| if ( | ||
| IWebAuthnVerifier(verifier).verifyWebAuthnSignatureAllowMalleability( | ||
| data.authenticatorData, | ||
| WebAuthnFlags.USER_VERIFICATION, | ||
| message, | ||
| data.clientDataFields, | ||
| data.r, | ||
| data.s, | ||
| x, | ||
| y | ||
| ) | ||
| ) { | ||
| magicValue = ERC1271.MAGIC_VALUE; | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * @dev Checks if the given verifier address contains code. | ||
| * @param verifier The address of the verifier to check. | ||
| * @return A boolean indicating whether the verifier contains code or not. | ||
| */ | ||
| function _validVerifier(address verifier) internal view returns (bool) { | ||
| // The verifier should contain code (The only way to implement a webauthn verifier is with a smart contract) | ||
| return !_hasNoCode(verifier); | ||
| } | ||
|
|
||
| /** | ||
| * @dev Checks if the provided account has no code. | ||
| * @param account The address of the account to check. | ||
| * @return True if the account has no code, false otherwise. | ||
| */ | ||
| function _hasNoCode(address account) internal view returns (bool) { | ||
| uint256 size; | ||
| // solhint-disable-next-line no-inline-assembly | ||
| assembly ("memory-safe") { | ||
| size := extcodesize(account) | ||
| } | ||
| return size == 0; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,13 +1,14 @@ | ||
| // SPDX-License-Identifier: LGPL-3.0-only | ||
| pragma solidity >=0.8.0; | ||
|
|
||
| import {SignatureValidatorConstants} from "./SignatureValidatorConstants.sol"; | ||
| import {ERC1271} from "../libraries/ERC1271.sol"; | ||
|
|
||
| /** | ||
| * @title ISafeSigner | ||
| * @dev A interface for smart contract Safe owners that supports multiple `isValidSignature` versions. | ||
| * @title Signature Validator Base Contract | ||
| * @dev A interface for smart contract Safe owners that supports multiple ERC-1271 `isValidSignature` versions. | ||
| * @custom:security-contact [email protected] | ||
| */ | ||
| abstract contract SignatureValidator is SignatureValidatorConstants { | ||
| abstract contract SignatureValidator { | ||
| /** | ||
| * @dev Validates the signature for the given data. | ||
| * @param data The signed data bytes. | ||
|
|
@@ -16,7 +17,7 @@ abstract contract SignatureValidator is SignatureValidatorConstants { | |
| */ | ||
| function isValidSignature(bytes memory data, bytes calldata signature) external view returns (bytes4 magicValue) { | ||
| if (_verifySignature(keccak256(data), signature)) { | ||
| magicValue = LEGACY_EIP1271_MAGIC_VALUE; | ||
| magicValue = ERC1271.LEGACY_MAGIC_VALUE; | ||
| } | ||
| } | ||
|
|
||
|
|
@@ -28,7 +29,7 @@ abstract contract SignatureValidator is SignatureValidatorConstants { | |
| */ | ||
| function isValidSignature(bytes32 message, bytes calldata signature) external view returns (bytes4 magicValue) { | ||
| if (_verifySignature(message, signature)) { | ||
| magicValue = EIP1271_MAGIC_VALUE; | ||
| magicValue = ERC1271.MAGIC_VALUE; | ||
| } | ||
| } | ||
|
|
||
|
|
||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -4,7 +4,8 @@ pragma solidity >=0.8.0 <0.9.0; | |
| /** | ||
| * @title ICustomECSignerFactory | ||
| * @dev Interface for creating and verifying ECDSA signers. This is a generalized interface that should be | ||
| * compatible with curves of any order size. Currently not used in the project and exists here for reference. | ||
| * compatible with curves of any order size. Currently not used in the project and exists here for reference. | ||
| * @custom:security-contact [email protected] | ||
| */ | ||
| interface ICustomECSignerFactory { | ||
| /** | ||
|
|
@@ -42,6 +43,7 @@ interface ICustomECSignerFactory { | |
| /** | ||
| * @title ICustom256BitECSignerFactory | ||
| * @dev Interface for creating and verifying ECDSA signers using 256-bit elliptic curves. | ||
| * @custom:security-contact [email protected] | ||
| */ | ||
| interface ICustom256BitECSignerFactory { | ||
| /** | ||
|
|
||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,34 @@ | ||
| // SPDX-License-Identifier: LGPL-3.0-only | ||
| /* solhint-disable payable-fallback */ | ||
| pragma solidity ^0.8.0; | ||
|
|
||
| /** | ||
| * @title P-256 Elliptic Curve Verifier. | ||
| * @dev P-256 verifier contract that follows the EIP-7212 EC verify precompile interface. For more | ||
| * details, refer to the EIP-7212 specification: <https://eips.ethereum.org/EIPS/eip-7212> | ||
| * @custom:security-contact [email protected] | ||
| */ | ||
| interface IP256Verifier { | ||
| /** | ||
| * @notice A fallback function that takes the following input format and returns a result | ||
| * indicating whether the signature is valid or not: | ||
| * - `input[ 0: 32]`: message | ||
| * - `input[ 32: 64]`: signature r | ||
| * - `input[ 64: 96]`: signature s | ||
| * - `input[ 96:128]`: public key x | ||
| * - `input[128:160]`: public key y | ||
| * | ||
| * The output is a Solidity ABI encoded boolean value indicating whether or not the signature is | ||
| * valid. Specifically, it returns 32 bytes with a value of `0x00..00` or `0x00..01` for an | ||
| * invalid or valid signature respectively. | ||
| * | ||
| * Note that this function does not follow the Solidity ABI format (in particular, it does not | ||
| * have a 4-byte selector), which is why it requires a fallback function and not regular | ||
| * Solidity function. Additionally, it has `view` function semantics, and is expected to be | ||
| * called with `STATICCALL` opcode. | ||
| * | ||
| * @param input The encoded input parameters. | ||
| * @return output The encoded signature verification result. | ||
| */ | ||
| fallback(bytes calldata input) external returns (bytes memory output); | ||
| } |
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