268 lines
5.1 KiB
Markdown
268 lines
5.1 KiB
Markdown
# Security Audit Preparation - Smart Accounts
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**Date**: 2026-01-26
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**Network**: ChainID 138 (SMOM-DBIS-138)
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---
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## Overview
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This document outlines the security audit preparation for Smart Accounts Kit integration contracts.
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---
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## Contracts to Audit
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### 1. AccountWalletRegistryExtended
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**File**: `contracts/smart-accounts/AccountWalletRegistryExtended.sol`
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**Key Functions**:
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- `linkSmartAccount()` - Links smart account to fiat account
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- `isSmartAccount()` - Checks if wallet is smart account
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- `setSmartAccountFactory()` - Updates factory address
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- `setEntryPoint()` - Updates EntryPoint address
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**Security Concerns**:
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- Access control (role-based)
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- Input validation
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- Smart account verification
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- Reentrancy protection
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---
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### 2. Smart Accounts Kit Contracts (External)
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**Contracts**:
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- EntryPoint (ERC-4337)
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- AccountFactory
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- Paymaster (optional)
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**Note**: These are external contracts from MetaMask Smart Accounts Kit. Review their security audits.
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---
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## Audit Checklist
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### Access Control
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- [ ] Role-based access control implemented correctly
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- [ ] Admin functions protected
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- [ ] Role assignment verified
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- [ ] Role revocation works correctly
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### Input Validation
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- [ ] Zero address checks
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- [ ] Parameter validation
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- [ ] Array bounds checking
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- [ ] Type validation
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### Smart Account Verification
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- [ ] Contract detection works correctly
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- [ ] Smart account validation
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- [ ] Address format validation
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- [ ] Duplicate prevention
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### Reentrancy Protection
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- [ ] Reentrancy guards in place
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- [ ] State changes before external calls
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- [ ] Checks-Effects-Interactions pattern
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### Gas Optimization
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- [ ] Gas-efficient storage patterns
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- [ ] Loop optimization
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- [ ] Unnecessary operations removed
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### Event Emission
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- [ ] All state changes emit events
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- [ ] Event parameters complete
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- [ ] Indexed parameters for filtering
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---
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## Known Security Considerations
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### 1. Smart Account Verification
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**Risk**: EOA could be mistaken for smart account
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**Mitigation**:
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- Check `extcodesize` > 0
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- Verify contract has code
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### 2. Factory Address Updates
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**Risk**: Malicious factory address
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**Mitigation**:
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- Admin-only function
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- Verify factory address before update
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- Consider timelock for critical updates
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### 3. EntryPoint Address Updates
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**Risk**: Malicious EntryPoint address
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**Mitigation**:
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- Admin-only function
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- Verify EntryPoint address
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- Consider timelock for critical updates
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---
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## Testing Requirements
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### Unit Tests
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- [ ] Access control tests
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- [ ] Input validation tests
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- [ ] Smart account detection tests
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- [ ] Edge case tests
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### Integration Tests
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- [ ] End-to-end flow tests
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- [ ] Multi-contract interaction tests
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- [ ] Failure mode tests
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### Fuzz Tests
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- [ ] Fuzz input parameters
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- [ ] Fuzz state transitions
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- [ ] Fuzz edge cases
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### Invariant Tests
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- [ ] State invariants
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- [ ] Access control invariants
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- [ ] Data consistency invariants
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---
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## Audit Deliverables
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### 1. Code Documentation
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- [ ] NatSpec comments on all functions
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- [ ] Architecture documentation
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- [ ] Security considerations documented
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### 2. Test Coverage
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- [ ] Unit test coverage > 90%
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- [ ] Integration test coverage > 80%
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- [ ] Fuzz test coverage
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- [ ] Invariant test coverage
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### 3. Security Documentation
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- [ ] Threat model
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- [ ] Security assumptions
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- [ ] Known limitations
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- [ ] Risk assessment
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---
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## Recommended Audit Firms
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### Smart Contract Auditors
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1. **Trail of Bits**
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- Experience with account abstraction
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- ERC-4337 expertise
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2. **OpenZeppelin**
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- Smart account experience
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- Access control expertise
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3. **Consensys Diligence**
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- MetaMask integration experience
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- Security best practices
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4. **CertiK**
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- Comprehensive audits
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- Formal verification
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---
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## Audit Scope
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### In Scope
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- AccountWalletRegistryExtended contract
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- Integration with existing AccountWalletRegistry
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- Smart account linking logic
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- Access control implementation
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### Out of Scope
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- MetaMask Smart Accounts Kit contracts (external)
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- EntryPoint contract (external, already audited)
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- AccountFactory contract (external, already audited)
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- Paymaster contract (external, optional)
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---
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## Pre-Audit Checklist
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### Code Quality
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- [ ] Code formatted (forge fmt)
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- [ ] No compiler warnings
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- [ ] All tests passing
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- [ ] Documentation complete
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### Security
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- [ ] Slither analysis run
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- [ ] Mythril analysis run
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- [ ] Manual security review
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- [ ] Known issues documented
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### Testing
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- [ ] Unit tests complete
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- [ ] Integration tests complete
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- [ ] Fuzz tests complete
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- [ ] Coverage > 90%
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---
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## Post-Audit Actions
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### 1. Address Findings
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- [ ] Review audit report
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- [ ] Prioritize findings
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- [ ] Fix critical issues
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- [ ] Fix high-priority issues
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- [ ] Document medium/low issues
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### 2. Re-testing
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- [ ] Re-run all tests
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- [ ] Verify fixes
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- [ ] Update documentation
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### 3. Re-audit (if needed)
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- [ ] Schedule re-audit for critical fixes
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- [ ] Verify all issues resolved
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---
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## Resources
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- [OpenZeppelin Security Best Practices](https://docs.openzeppelin.com/contracts/security)
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- [Consensys Best Practices](https://consensys.github.io/smart-contract-best-practices/)
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- [Trail of Bits Security Guide](https://github.com/crytic/building-secure-contracts)
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---
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**Last Updated**: 2026-01-26
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