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Audit Readiness Checklist

Project Overview

Project: SwapTrade - Educational Trading Simulator
Contract Version: 1
Technology: Soroban Smart Contracts (Rust)
Status: Pre-audit security hardening complete

📋 PRE-AUDIT VERIFICATION

Security Documentation

  • SECURITY.md - Comprehensive vulnerability checklist
  • UNSAFE_BLOCKS.md - Documented unsafe code blocks
  • Audit Readiness Checklist - This document

Core Security Implementation

  • Invariant Verification - verify_contract_invariants() function implemented
  • Overflow Protection - Saturating arithmetic throughout
  • Reentrancy Protection - Verified by Soroban execution model
  • Authorization Matrix - Defined and documented
  • Arithmetic Safety - All critical math operations secured
  • Oracle Staleness - Price validation with 10-minute threshold
  • Fee Bounds - Max 1% fee validation implemented

Testing Coverage

  • Unit Tests - Core functionality covered
  • Fuzz Tests - 20+ randomized property-based tests
  • Integration Tests - End-to-end scenario testing
  • Invariant Tests - State consistency verification
  • Edge Case Tests - Overflow/underflow, boundary conditions

Static Analysis

  • Clippy - Linting run with <5 warnings (in progress)
  • Cargo Audit - Dependencies checked for vulnerabilities
  • Custom Lints - Security-specific linting rules

🔍 AUDIT CHECKLIST

1. Authorization & Access Control

1.1 Admin Functions

  • Verify pause_trading(), resume_trading(), set_admin() have proper auth checks
  • Confirm require_admin() is used for all sensitive operations
  • Validate emergency functions are restricted to admin only
  • Check for unauthorized access patterns in test cases

1.2 User Permissions

  • Verify users can only spend their own tokens
  • Confirm LP positions can only be modified by LP owner
  • Check badge awarding is isolated per user
  • Validate rate limit enforcement

1.3 External Calls

  • Confirm no external contract calls that could introduce reentrancy
  • Verify oracle integration is secure (stale price rejection)
  • Check batch operations for cross-call safety

2. Arithmetic Security

2.1 Overflow Protection

  • Verify all additions use saturating_add() or checked arithmetic
  • Confirm all subtractions use saturating_sub()
  • Validate multiplication uses saturating_mul() for large numbers
  • Check division for zero-denominator protection
  • Verify LP token calculations can't overflow

2.2 Precision & Rounding

  • Review integer division truncation effects
  • Verify fee calculation precision (basis points)
  • Check price precision handling (18 decimals)
  • Validate AMM constant product maintains invariants
  • Confirm rounding doesn't create arbitrage opportunities

2.3 Edge Cases

  • Test with i128::MAX and i128::MIN values
  • Validate zero amount handling
  • Check negative amount rejection
  • Verify proper error handling for extreme values

3. State Management & Invariants

3.1 Core Invariants

  • Asset Conservation: total_supply = user_balances + pool_reserves + fees
  • AMM Invariant: x * y = k (constant product, accounting for fees)
  • Fee Bounds: 0% <= fees <= 1% of transaction amount
  • Balance Non-Negative: No user balances can be negative
  • LP Token Conservation: Total LP tokens = sum of user positions
  • State Monotonicity: Counters never decrease

3.2 State Consistency

  • Verify all state changes are atomic
  • Check for inconsistent state between operations
  • Validate user portfolio integrity after all operations
  • Confirm metrics accurately track volume/usage

3.3 Recovery Procedures

  • Verify state snapshots work correctly
  • Test account freezing/unfreezing
  • Check emergency pause/unpause functionality
  • Validate contract upgrade migration process

4. Business Logic

4.1 AMM Implementation

  • Validate swap function correctness (XLM <-> USDCSIM)
  • Check LP token minting logic (first deposit vs subsequent)
  • Verify LP token burning proportionality
  • Test fee collection and allocation
  • Confirm slippage protection works

4.2 Trading Engine

  • Test rate limiting by tier levels
  • Validate fee calculation based on user tier
  • Check transaction ordering effects
  • Verify portfolio balance tracking
  • Test batch trading operations

4.3 Reward System

  • Verify badge earning conditions
  • Check achievement uniqueness (no duplicates)
  • Validate progression tracking
  • Test tier calculation accuracy

5. Oracle Integration

5.1 Price Feeds

  • Validate STALE_THRESHOLD_SECONDS (600s) is appropriate
  • Verify rejection of stale prices
  • Check 1:1 fallback safety (document as known risk)
  • Test oracle data parsing

5.2 External Data Trust

  • Identify oracle dependency risks
  • Check for price manipulation possibilities
  • Validate error handling for oracle failures
  • Verify panic conditions for critical oracle failures

6. Known Risks & Limitations

6.1 High Priority Risks

  • Admin Authentication Disabled - Must be re-enabled for mainnet
  • Oracle Price Fallback - Remove 1:1 fallback for production

6.2 Medium Priority Issues

  • Event emission coverage for all state changes
  • Monitoring capabilities for off-chain observability
  • Upgradeability testing and procedures

6.3 Low Priority Notes

  • Documentation updates for new invariant functions
  • Comment consistency with implemented security measures

7. Test Coverage Review

7.1 Unit Tests

  • Run cargo test and verify all tests pass
  • Confirm edge cases covered adequately
  • Verify error handling in failure cases
  • Test concurrent operation safety

7.2 Fuzz Tests

  • Verify 20+ property-based tests included
  • Confirm random input coverage for core functions
  • Test boundary conditions with random values
  • Validate stress test with 100 operations

7.3 Integration Tests

  • Execute comprehensive test suite
  • Confirm end-to-end functionality
  • Verify system behaves under load
  • Test migration scenarios

7.4 Manual Review Tests

  • Try to create negative balances
  • Test extremely large transaction amounts
  • Validate reentrancy prevention (manually)
  • Confirm time-dependent functionality works correctly

8. Formal Verification & Proofs

8.1 Invariants for Proving

  • x * y decreases or stays constant (fee taken)
  • fees ≥ 0 for all fee-related operations
  • User balances maintain debits = credits + balances
  • Admin function calls authorized through require_admin

8.2 Verification Target Coverage

  • Batch Operation Function Requirements
  • Equations for specifying fairness/laws
  • Verify consistency vs isolation or throughput
  • Establish failure conditions causing proofs

8.3 Execution Process

  • Built in VScode for v 20.9.6 but Soroban team notes recommended fix
  • Make edits described step by step in implementation_manual.md
  • Resolve try_swap error and other compilation issues

📊 AUDIT DELIVERABLES

Required Documentation

  • SECURITY.md - Complete security analysis
  • UNSAFE_BLOCKS.md - Unsafe code documentation
  • AUDIT_CHECKLIST.md - This checklist
  • FORMAL_VERIFICATION.md - Proof specifications (if applicable)
  • DEPLOYMENT_GUIDE.md - Production deployment instructions

Test Artifacts

  • Test suite with 100% core coverage
  • Fuzz tests with property-based verification
  • Invariant checking functions
  • Performance benchmarks
  • Gas usage analysis

Code Quality

  • <5 Clippy warnings
  • No cargo audit vulnerabilities
  • Consistent code formatting
  • Clear inline documentation

✅ AUDIT READINESS STATUS

Current Status: ⚠️ PRE-AUDIT HARDENING COMPLETE

Ready for Audit: YES (with known issues to address)

Blocking Issues

  • Fix authentication bypass in emergency functions
  • Remove 1:1 oracle price fallback for production

Recommended Before Audit

  • Run cargo clippy --all-targets and fix warnings
  • Run cargo audit and address any findings
  • Execute full test suite: cargo test --workspace
  • Document any remaining compilation errors

Audit Scope Confirmation

  • Core trading logic (swaps, LP, fees)
  • Portfolio and balance management
  • Reward and badge system
  • Emergency controls and admin functions
  • Oracle integration and price handling
  • Rate limiting and tier system
  • Batch operations and atomicity
  • Migration and upgrade procedures

📞 AUDIT CONTACT INFORMATION

Project Repository: https://github.com/your-org/swaptrade-contracts
Security Contact: security@swaptrade.example
Lead Developer: [Your Name]
Audit Coordinator: [Contact Name]

📅 TIMELINE

Security Hardening Complete: 2026-02-21
Target Audit Start: [TBD]
Expected Audit Duration: 2-3 weeks
Target Production Deployment: [TBD]

This checklist should be completed by the development team before engaging auditors. Items marked with [x] indicate completion, [ ] indicate pending work.