Feat/session key owned (#6)

* session key owned validator

* named variable for mapping

* deployed to goerli

Author: leekt

broadcast/DeployKernel.s.sol/5/run-1686212610.json

@@ -3,9 +3,10 @@ src = 'src'
 out = 'out'
 libs = ['lib']
 remappings = ['account-abstraction/=lib/account-abstraction/contracts/']
+solc_version = '0.8.19'
 bytecode_hash = "none"
 cbor_metadata = false
 optimize = true
 runs = 1000000
 
-# See more config options https://github.com/foundry-rs/foundry/tree/master/config
+# See more config options https://github.com/foundry-rs/foundry/tree/master/config

broadcast/DeployKernel.s.sol/5/run-1686212623.json

@@ -42,7 +42,7 @@ contract KillSwitchValidator is IKernelValidator {
         address signer;
         bytes calldata signature;
         KillSwitchValidatorStorage storage validatorStorage = killSwitchValidatorStorage[_userOp.sender];
-        if (_userOp.signature.length == 6 + 20 + 65) {
+        if (_userOp.signature.length == 6 + 65) {
             require(bytes4(_userOp.callData[0:4]) != KernelStorage.disableMode.selector);
             signer = validatorStorage.guardian;
             uint48 pausedUntil = uint48(bytes6(_userOp.signature[0:6]));

broadcast/DeployKernel.s.sol/5/run-latest.json

@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.0;
+
+import "./IValidator.sol";
+import "openzeppelin-contracts/contracts/utils/cryptography/EIP712.sol";
+import "src/utils/KernelHelper.sol";
+import "account-abstraction/core/Helpers.sol";
+
+struct SessionKeyStorage {
+    uint48 validUntil;
+    uint48 validAfter;
+}
+
+contract SessionKeyOwnedValidator is IKernelValidator {
+    event OwnerChanged(address indexed kernel, address indexed oldOwner, address indexed newOwner);
+
+    mapping(address sessionKey => mapping(address kernel => SessionKeyStorage)) public sessionKeyStorage;
+
+    function disable(bytes calldata _data) external override {
+        address sessionKey = address(bytes20(_data[0:20]));
+        delete sessionKeyStorage[sessionKey][msg.sender];
+    }
+
+    function enable(bytes calldata _data) external override {
+        address sessionKey = address(bytes20(_data[0:20]));
+        uint48 validUntil = uint48(bytes6(_data[20:26]));
+        uint48 validAfter = uint48(bytes6(_data[26:32]));
+        require(validUntil > validAfter, "SessionKeyOwnedValidator: invalid validUntil/validAfter"); // we do not allow validUntil == 0 here use validUntil == 2**48-1 instead
+        sessionKeyStorage[sessionKey][msg.sender] = SessionKeyStorage(validUntil, validAfter);
+    }
+
+    function validateUserOp(UserOperation calldata _userOp, bytes32 _userOpHash, uint256)
+        external
+        view
+        override
+        returns (uint256 validationData)
+    {
+        bytes32 hash = ECDSA.toEthSignedMessageHash(_userOpHash);
+        address recovered = ECDSA.recover(hash, _userOp.signature);
+
+        SessionKeyStorage storage sessionKey = sessionKeyStorage[recovered][msg.sender];
+        if (sessionKey.validUntil == 0 ) { // we do not allow validUntil == 0 here
+            return SIG_VALIDATION_FAILED;
+        }
+        return _packValidationData(false, sessionKey.validUntil, sessionKey.validAfter);
+    }
+
+    function validateSignature(bytes32 hash, bytes calldata signature) public view override returns (uint256) {
+        bytes32 ethhash = ECDSA.toEthSignedMessageHash(hash);
+        address recovered = ECDSA.recover(ethhash, signature);
+
+        SessionKeyStorage storage sessionKey = sessionKeyStorage[recovered][msg.sender];
+        if (sessionKey.validUntil == 0 ) { // we do not allow validUntil == 0 here
+            return SIG_VALIDATION_FAILED;
+        }
+        return _packValidationData(false, sessionKey.validUntil, sessionKey.validAfter);
+    }
+}