# Security Best Practices

## Smart Contract Security

### Executor Contract

1. **Multi-Sig Ownership**: Always use multi-sig for executor ownership
   - Minimum 3-of-5 signers
   - Separate signers for different functions
   - Regular key rotation

2. **Allow-List Management**: Strictly control allowed targets
   - Only add verified protocol addresses
   - Regularly review and update
   - Remove unused addresses
   - Document all additions

3. **Flash Loan Security**: 
   - Only allow verified Aave Pools
   - Verify initiator in callback
   - Test flash loan scenarios thoroughly

4. **Pausability**: 
   - Keep pause functionality accessible
   - Test emergency pause procedures
   - Document pause/unpause process

## Strategy Security

### Input Validation

1. **Blind Values**: Never hardcode sensitive values
   - Use blinds for amounts, addresses
   - Validate blind values before use
   - Sanitize user inputs

2. **Address Validation**: 
   - Verify all addresses are valid
   - Check addresses match target chain
   - Validate protocol addresses

3. **Amount Validation**: 
   - Check for zero amounts
   - Verify amount precision
   - Validate against limits

### Guard Usage

1. **Always Use Guards**: 
   - Health factor checks for lending
   - Slippage protection for swaps
   - Gas limits for all strategies
   - Oracle sanity checks

2. **Guard Thresholds**: 
   - Set conservative thresholds
   - Review and adjust based on market conditions
   - Test guard behavior

3. **Guard Failure Actions**: 
   - Use "revert" for critical checks
   - Use "warn" for informational checks
   - Document guard behavior

## Operational Security

### Key Management

1. **Never Store Private Keys**: 
   - Use hardware wallets
   - Use key management services (KMS)
   - Rotate keys regularly
   - Never commit keys to git

2. **Access Control**: 
   - Limit access to production systems
   - Use separate keys for different environments
   - Implement least privilege

### Monitoring

1. **Transaction Monitoring**: 
   - Monitor all executions
   - Alert on failures
   - Track gas usage
   - Review unusual patterns

2. **Guard Monitoring**: 
   - Log all guard evaluations
   - Alert on guard failures
   - Track guard effectiveness

3. **Price Monitoring**: 
   - Monitor oracle health
   - Alert on stale prices
   - Track price deviations

### Incident Response

1. **Emergency Procedures**: 
   - Pause executor immediately if needed
   - Document incident response plan
   - Test emergency procedures
   - Have rollback plan ready

2. **Communication**: 
   - Notify stakeholders promptly
   - Document incidents
   - Post-mortem analysis
   - Update procedures based on learnings

## Development Security

### Code Review

1. **Review All Changes**: 
   - Require code review
   - Security-focused reviews
   - Test coverage requirements

2. **Dependency Management**: 
   - Keep dependencies updated
   - Review dependency changes
   - Use dependency scanning

### Testing

1. **Comprehensive Testing**: 
   - Unit tests for all components
   - Integration tests for flows
   - Security-focused tests
   - Fork testing before deployment

2. **Penetration Testing**: 
   - Regular security audits
   - Test attack vectors
   - Review access controls

## Best Practices Summary

✅ **Do**:
- Use multi-sig for ownership
- Validate all inputs
- Use guards extensively
- Monitor all operations
- Test thoroughly
- Document everything
- Keep dependencies updated
- Use hardware wallets

❌ **Don't**:
- Hardcode sensitive values
- Skip validation
- Ignore guard failures
- Deploy without testing
- Store private keys in code
- Skip security reviews
- Use untested strategies
- Ignore monitoring alerts

## Security Checklist

Before deployment:
- [ ] Security audit completed
- [ ] Multi-sig configured
- [ ] Allow-list verified
- [ ] Guards tested
- [ ] Monitoring configured
- [ ] Emergency procedures documented
- [ ] Incident response plan ready
- [ ] Dependencies updated
- [ ] Tests passing
- [ ] Documentation complete