7.2 KiB
Example Output
When I complete the workflow, you'll get a comprehensive security report:
=== SECURE DEVELOPMENT WORKFLOW REPORT ===
Project: DeFi Staking Contract
Platform: Solidity 0.8.19
Workflow Date: March 15, 2024
---
## STEP 1: KNOWN SECURITY ISSUES
### Slither Security Scan
Command: slither . --exclude-dependencies
Status: ✓ CLEAN (after fixes)
**Issues Found & Resolved:**
✓ HIGH: Reentrancy in withdraw() - FIXED (added ReentrancyGuard)
✓ MEDIUM: Unprotected selfdestruct - FIXED (removed function)
✓ LOW: Missing zero-address checks - FIXED (added require statements)
✓ INFO: 5 optimization suggestions - DOCUMENTED
**Current Status:** All high/medium issues resolved. Ready for next steps.
---
## STEP 2: SPECIAL FEATURES
### Upgradeability Check
Pattern Detected: UUPS Proxy (ERC1967)
**slither-check-upgradeability Results:**
✓ Storage layout compatible
✓ No function collisions
✓ Initialize function protected
✓ _authorizeUpgrade restricted to owner
⚠ No timelock on upgrades
**Recommendation:** Add 48-hour timelock before Step 3 (Critical)
### ERC20 Conformance
**slither-check-erc Results:**
✓ All required functions present
✓ transfer/transferFrom return bool
✓ decimals returns uint8
✓ approve race condition mitigated (increaseAllowance/decreaseAllowance)
✓ No external calls in transfer functions
**Status:** FULLY COMPLIANT with ERC20 standard
---
## STEP 3: VISUAL SECURITY INSPECTION
### Inheritance Graph
File: inheritance-graph.png
**Analysis:**
StakingToken ├─ ERC20Upgradeable │ ├─ IERC20 │ └─ Context ├─ OwnableUpgradeable └─ UUPSUpgradeable
✓ Shallow hierarchy (depth: 3)
✓ No shadowing detected
✓ C3 linearization correct
✓ No diamond inheritance issues
### Function Summary
| Function | Visibility | Modifiers | Mutability | Risk |
|--------------------|------------|--------------------|-------------|-------|
| stake() | external | nonReentrant | non-payable | Low |
| withdraw() | external | nonReentrant | non-payable | Low |
| claimRewards() | external | nonReentrant | non-payable | Low |
| setRewardRate() | external | onlyOwner | non-payable | Med |
| pause() | external | onlyOwner | non-payable | Med |
| _authorizeUpgrade()| internal | onlyOwner | view | High |
✓ All privileged functions have access controls
✓ External functions have reentrancy protection
⚠ setRewardRate() allows owner to set arbitrary rate (no bounds)
**Recommendation:** Add min/max bounds to setRewardRate()
### Variables and Authorization
**State Variable Access:**
totalStaked (uint256)
├─ Written by: stake() [external, nonReentrant]
├─ Written by: withdraw() [external, nonReentrant]
└─ Read by: calculateRewards() [internal]
rewardRate (uint256)
├─ Written by: setRewardRate() [external, onlyOwner]
└─ Read by: calculateRewards() [internal]
⚠ No bounds checking - can be set to extreme values
userStakes (mapping)
├─ Written by: stake() [external, nonReentrant]
├─ Written by: withdraw() [external, nonReentrant]
└─ Protected by access controls ✓
**Critical Finding:** rewardRate modification needs validation
---
## STEP 4: SECURITY PROPERTIES DOCUMENTED
### Properties Defined
**State Machine Invariants:**
1. totalStaked == sum of all userStakes[user]
2. contract balance >= totalStaked + totalRewards
3. User cannot withdraw more than staked
**Access Control Properties:**
4. Only owner can modify rewardRate
5. Only owner can pause/unpause
6. Only owner can authorize upgrades
**Arithmetic Properties:**
7. calculateRewards() cannot overflow
8. Staking amount must be > 0
9. Reward calculation precision loss < 0.01%
### Testing Setup
**Echidna Configuration Created:**
File: echidna.yaml
```yaml
testMode: assertion
testLimit: 50000
deployer: "0x10000"
sender: ["0x10000", "0x20000", "0x30000"]
Invariants Implemented: File: test/echidna/StakingInvariants.sol
contract StakingInvariants {
function echidna_total_staked_matches_sum() public returns (bool) {
return staking.totalStaked() == calculateExpectedTotal();
}
function echidna_balance_sufficient() public returns (bool) {
return address(staking).balance >= staking.totalStaked();
}
}
Fuzzing Results: ✓ All 3 invariants hold after 50,000 runs ✓ No violations found ✓ Coverage: 94% of contract code
Next Step: Run Manticore for formal verification (optional, 2-3 days)
STEP 5: MANUAL REVIEW AREAS
Privacy Analysis
✓ No secrets stored on-chain ✓ All state variables appropriately public/internal ✓ No commit-reveal needed for current design ⚠ User staking amounts are publicly visible
Note: Public visibility of stakes is acceptable for this use case.
Front-Running Risks
Identified Risks: ⚠ setRewardRate() can be front-run by users to claim before rate decrease
Scenario:
- Owner submits tx to decrease rewardRate from 10% to 5%
- Users see pending tx in mempool
- Users front-run with claimRewards() at old 10% rate
Mitigation:
- Add timelock to rewardRate changes (48-hour delay)
- Implement gradual rate transitions
Cryptography Review
✓ No custom cryptography used ✓ No randomness requirements ✓ No signature verification N/A - Contract doesn't use cryptographic operations
DeFi Interaction Risks
External Dependencies:
- None (self-contained staking contract)
✓ No oracle dependencies ✓ No flash loan risks (uses snapshots) ✓ No external protocol calls
Assessment: Low DeFi interaction risk
ACTION PLAN
Critical (Fix Before Deployment - Week 1)
-
✅ Add timelock to upgrades [COMPLETED]
- Deployed TimelockController
- 48-hour delay configured
- Owner transferred to timelock
-
⚠ Add bounds to setRewardRate() [IN PROGRESS]
- Add MIN_REWARD_RATE = 1%
- Add MAX_REWARD_RATE = 50%
- Estimated completion: 1 day
-
⚠ Add timelock to rewardRate changes [PENDING]
- Use same timelock as upgrades
- Estimated effort: 2 days
High Priority (Before Audit - Week 2)
-
Document all security properties [80% COMPLETE]
- 9/12 properties documented
- Need to document upgrade invariants
- Estimated completion: 2 days
-
Increase test coverage to 95% [CURRENT: 89%]
- Add pause state tests
- Add edge case tests (zero amounts, etc.)
- Estimated effort: 3 days
Medium Priority (Nice to Have)
- Add Manticore formal verification
- Verify critical properties formally
- Estimated effort: 1 week
- Impact: High confidence
WORKFLOW CHECKLIST
✅ Step 1: Slither scan clean ✅ Step 2: Special features validated (upgradeability, ERC20) ✅ Step 3: Visual inspection complete (diagrams generated) ✅ Step 4: Properties documented, Echidna configured ✅ Step 5: Manual review complete
🎯 WORKFLOW STATUS: 95% COMPLETE
Remaining Tasks:
- Add setRewardRate() bounds validation
- Complete timelock integration
- Document 3 remaining properties
Estimated Time to Full Completion: 3-4 days
Ready for external audit after critical tasks completed.
Trail of Bits Secure Development Workflow - v0.1.0