Added enhanced security

README.md

@@ -58,13 +58,33 @@ Backr is a decentralized platform built on Ethereum that enables transparent and
 - `QuadraticFunding.sol`: Implementation of quadratic funding mechanism
 - `PlatformToken.sol`: BACKR token with staking capabilities
 - `UserProfile.sol`: User reputation and profile management
+- `SecurityControls.sol`: Advanced security mechanisms with emergency management
+
+#### Security Controls Overview
+
+The `SecurityControls` contract provides a comprehensive security framework with multiple layers of protection:
+
+- **Rate Limiting**: Prevents excessive contract interactions by configuring call limits within specific time windows.
+- **Multi-Signature Approvals**: Requires multiple authorized parties to approve critical operations, reducing single-point-of-failure risks.
+- **Emergency Management**:
+  - Allows authorized emergency roles to pause the entire contract ecosystem
+  - Supports multiple emergency triggers without cooldown restrictions
+  - Provides flexible circuit breaker mechanisms to halt all contract interactions
+  - Comprehensive logging for all emergency-related actions
+  - Configurable cooldown periods for fine-tuned emergency response
 
 ### Security Features
 - Reentrancy guards
 - Time-locked execution
 - Access control mechanisms
 - Minimum liquidity requirements
 - Pausable functionality
+- **Enhanced Emergency Controls**
+  - Multiple emergency trigger capabilities
+  - Flexible circuit breaker mechanism
+  - Configurable emergency cooldown periods
+  - Role-based emergency management
+  - Comprehensive event logging for emergency actions
 
 ## Development
 

TODO.md

@@ -0,0 +1,70 @@
+# Backr TODO List
+
+## High Priority
+
+### Core Infrastructure
+- [x] Implement rate limiting for sensitive operations
+- [x] Add multi-signature wallet support
+- [x] Create emergency response system
+- [x] Add fraud detection mechanisms
+
+### User Experience
+- [ ] Add project categories and tags for discovery
+- [ ] Implement project templates
+- [ ] Create dispute resolution system
+- [ ] Add profile delegation for team management
+
+## Medium Priority
+
+### Analytics & Reporting
+- [ ] Build analytics dashboard for project performance
+- [ ] Implement milestone completion tracking
+- [ ] Add quadratic funding round analytics
+- [ ] Create backer engagement metrics
+
+### Profile Enhancements
+- [ ] Add social graph functionality
+- [ ] Implement endorsement system
+- [ ] Create project portfolio showcase
+- [ ] Enable profile verification improvements
+
+### Liquidity Features
+- [ ] Add multiple pool tiers
+- [ ] Implement flash loan functionality
+- [ ] Create liquidity mining incentives
+- [ ] Add yield farming opportunities
+
+## Future Considerations
+
+### Badge System
+- [ ] Create dynamic badge properties
+- [ ] Implement time-limited event badges
+- [ ] Add badge trading marketplace
+- [ ] Develop badge-based governance weight
+
+### Governance
+- [ ] Add delegation capabilities
+- [ ] Implement gasless voting
+- [ ] Create specialized committees
+- [ ] Add proposal templates
+
+### Integration & Expansion
+- [ ] Add API endpoints
+- [ ] Create webhook system
+- [ ] Implement cross-chain functionality
+- [ ] Add oracle integration
+
+## Completed Tasks
+- [x] Initial smart contract setup
+- [x] Basic user profile system
+- [x] Core milestone tracking
+- [x] Basic quadratic funding mechanism
+- [x] Implement rate limiting for sensitive operations
+- [x] Add multi-signature wallet support
+- [x] Create emergency response system
+- [x] Add fraud detection mechanisms
+
+## Notes
+- Priority levels may be adjusted based on community feedback
+- Security-related tasks should be reviewed by external auditors
+- Integration features should be compatible with existing DeFi protocols

foundry.toml

@@ -3,6 +3,11 @@ src = "src"
 out = "out"
 libs = ["lib"]
 
+# Enable IR-based compilation and optimizer
+via_ir = true
+optimizer = true
+optimizer_runs = 200
+
 # Explicit remappings for OpenZeppelin contracts
 remappings = [
     "@openzeppelin/=lib/openzeppelin-contracts/",

src/Project.sol

@@ -2,10 +2,11 @@
 pragma solidity ^0.8.13;
 
 import "./UserProfile.sol";
+import "./SecurityControls.sol";
 
 /// @title Project Contract for Backr Platform
 /// @notice Manages project creation, funding, and milestone tracking
-contract Project {
+contract Project is SecurityControls {
     // Structs
     struct Milestone {
         string description;
@@ -33,6 +34,14 @@ contract Project {
     mapping(uint256 => ProjectDetails) public projects;
     uint256 public totalProjects;
 
+    // Operation identifiers for rate limiting and multi-sig
+    bytes32 public constant CREATE_PROJECT_OPERATION = keccak256("CREATE_PROJECT");
+    bytes32 public constant LARGE_FUNDING_OPERATION = keccak256("LARGE_FUNDING");
+    bytes32 public constant MILESTONE_COMPLETION_OPERATION = keccak256("MILESTONE_COMPLETION");
+
+    // Funding thresholds
+    uint256 public constant LARGE_FUNDING_THRESHOLD = 10 ether;
+
     // Events
     event ProjectCreated(uint256 indexed projectId, address indexed creator, string title);
     event MilestoneAdded(uint256 indexed projectId, uint256 milestoneId, string description);
@@ -50,8 +59,23 @@ contract Project {
     error MilestoneAlreadyCompleted();
     error InsufficientVotes();
 
-    constructor(address _userProfileAddress) {
+    constructor(address _userProfileAddress) SecurityControls() {
         userProfile = UserProfile(_userProfileAddress);
+
+        // Grant the deployer the DEFAULT_ADMIN_ROLE
+        _setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
+
+        // Configure rate limits
+        _configureRateLimit(CREATE_PROJECT_OPERATION, 1, 24 hours); // 1 project per 24 hours
+        _configureRateLimit(MILESTONE_COMPLETION_OPERATION, 10, 1 days); // 10 milestone completions per day
+
+        // Initialize emergency settings
+        emergencyConfig.cooldownPeriod = 12 hours;
+
+        // Setup default multi-sig configuration for large funding
+        address[] memory defaultApprovers = new address[](1);
+        defaultApprovers[0] = msg.sender;
+        configureMultiSig(LARGE_FUNDING_OPERATION, 1, defaultApprovers);
     }
 
     /// @notice Creates a new project with initial milestones
@@ -61,12 +85,12 @@ contract Project {
     /// @param _milestoneFunding Array of funding requirements for each milestone
     /// @param _milestoneVotesRequired Array of required votes for each milestone
     function createProject(
-        string memory _title,
-        string memory _description,
-        string[] memory _milestoneDescriptions,
-        uint256[] memory _milestoneFunding,
-        uint256[] memory _milestoneVotesRequired
-    ) external {
+        string calldata _title,
+        string calldata _description,
+        string[] calldata _milestoneDescriptions,
+        uint256[] calldata _milestoneFunding,
+        uint256[] calldata _milestoneVotesRequired
+    ) external whenNotPaused rateLimitGuard(CREATE_PROJECT_OPERATION) {
         if (!userProfile.hasProfile(msg.sender)) revert UserNotRegistered();
         if (bytes(_title).length == 0 || _milestoneDescriptions.length == 0) revert InvalidProjectParameters();
         if (
@@ -100,12 +124,24 @@ contract Project {
         }
     }
 
-    /// @notice Contribute funds to a project
-    /// @param _projectId ID of the project
-    function contributeToProject(uint256 _projectId) external payable {
+    /// @notice Contributes funds to a project
+    function contributeToProject(uint256 _projectId)
+        external
+        payable
+        whenNotPaused
+        whenCircuitBreakerOff
+        nonReentrant
+    {
         if (!projects[_projectId].isActive) revert ProjectNotFound();
         if (msg.value == 0) revert InsufficientFunds();
 
+        // For large funding amounts, require multi-sig approval
+        if (msg.value >= LARGE_FUNDING_THRESHOLD) {
+            bytes32 txHash = keccak256(abi.encodePacked(_projectId, msg.sender, msg.value, block.timestamp));
+            MultiSigConfig storage config = multiSigConfigs[LARGE_FUNDING_OPERATION];
+            require(config.executed[txHash], "Requires multi-sig approval");
+        }
+
         ProjectDetails storage project = projects[_projectId];
         project.currentFunding += msg.value;
 
@@ -115,7 +151,7 @@ contract Project {
     /// @notice Vote for milestone completion
     /// @param _projectId ID of the project
     /// @param _milestoneId ID of the milestone
-    function voteMilestone(uint256 _projectId, uint256 _milestoneId) external {
+    function voteMilestone(uint256 _projectId, uint256 _milestoneId) external whenNotPaused whenCircuitBreakerOff {
         ProjectDetails storage project = projects[_projectId];
         if (!project.isActive) revert ProjectNotFound();
         if (_milestoneId >= project.milestoneCount) revert MilestoneNotFound();
@@ -156,6 +192,8 @@ contract Project {
     function getMilestone(uint256 _projectId, uint256 _milestoneId)
         external
         view
+        whenNotPaused
+        whenCircuitBreakerOff
         returns (
             string memory description,
             uint256 fundingRequired,
@@ -184,11 +222,26 @@ contract Project {
     function hasVotedForMilestone(uint256 _projectId, uint256 _milestoneId, address _voter)
         external
         view
+        whenNotPaused
+        whenCircuitBreakerOff
         returns (bool)
     {
         return projects[_projectId].milestones[_milestoneId].hasVoted[_voter];
     }
 
+    /// @notice Emergency withdrawal of funds
+    function emergencyWithdraw(uint256 _projectId) external onlyRole(EMERGENCY_ROLE) whenPaused {
+        ProjectDetails storage project = projects[_projectId];
+        if (!project.isActive) revert ProjectNotFound();
+
+        uint256 amount = project.currentFunding;
+        project.currentFunding = 0;
+        project.isActive = false;
+
+        (bool success,) = project.creator.call{value: amount}("");
+        require(success, "Transfer failed");
+    }
+
     /// @notice Receive function to accept ETH payments
     receive() external payable {}
 }