UmbraCore XPC Implementation Plan¶

Overview¶

Document Version: 1.0.0 Date: 2025-02-17 Status: In Progress

1. Architecture Changes¶

Current Architecture¶

UmbraCore/
├── CryptoTypes/
│   └── Services/
│       ├── CryptoService.swift       # Direct crypto operations
│       └── CredentialManager.swift    # Direct credential management
└── SecurityTypes/
    └── Protocols/
        └── SecurityProvider.swift     # Direct security operations

Target Architecture¶

UmbraCore/
├── XPC/
│   ├── Core/                         # XPC infrastructure
│   │   ├── XPCError.swift
│   │   ├── XPCServiceProtocols.swift
│   │   └── XPCConnectionManager.swift
│   ├── CryptoService/               # Crypto XPC service
│   │   ├── CryptoXPCService.swift
│   │   └── Info.plist
│   └── SecurityService/             # Security XPC service
│       ├── SecurityXPCService.swift
│       └── Info.plist
└── [existing modules remain]

2. Migration Strategy¶

Phase 1: Infrastructure (Current)¶

[x] Create XPC Core module
[x] Define XPC protocols
[x] Implement connection management
[x] Add error handling

Phase 2: Service Implementation¶

[ ] Create CryptoXPCService
[ ] Implement service bundle
[ ] Add privilege separation
[ ] Set up entitlements
[ ] Configure sandbox
[ ] Create SecurityXPCService
[ ] Implement service bundle
[ ] Add privilege separation
[ ] Set up entitlements
[ ] Configure sandbox

Phase 3: Client Updates¶

[ ] Update CredentialManager
[ ] Add XPC client implementation
[ ] Implement fallback mechanism
[ ] Add connection recovery
[ ] Update SecurityProvider clients
[ ] Add XPC client implementation
[ ] Implement fallback mechanism
[ ] Add connection recovery

Phase 4: Testing & Validation¶

[ ] Create XPCTests target
[ ] Implement service tests
[ ] Add connection tests
[ ] Test error scenarios
[ ] Validate security boundaries

3. Security Considerations¶

Privilege Separation¶

// Example service configuration
let connection = NSXPCConnection(serviceName: "com.umbracore.cryptoservice")
connection.remoteObjectInterface = NSXPCInterface(with: CryptoXPCServiceProtocol.self)
connection.auditSessionIdentifier = au_session_self()

Entitlements¶

<!-- Required entitlements -->
<key>com.apple.security.app-sandbox</key>
<true/>
<key>com.apple.security.temporary-exception.files.home-relative-path.read-write</key>
<string>Library/Application Support/UmbraCore/</string>

4. Error Handling Strategy¶

Error Categories¶

Connection Errors
Service Errors
Security Validation Errors
Resource Errors

Recovery Strategy¶

public protocol XPCErrorRecoverable {
    var isRecoverable: Bool { get }
    var retryCount: Int { get }
    var retryDelay: TimeInterval { get }
}

5. Performance Considerations¶

Connection Management¶

Connection pooling
Request batching
Async operations
Resource cleanup

Monitoring¶

Connection status
Operation latency
Error rates
Resource usage

6. Testing Strategy¶

Unit Tests¶

func testCryptoXPCService() async throws {
    let service = CryptoXPCService()
    let data = Data([1, 2, 3])
    let key = try await service.generateSecureRandomKey(length: 32)
    let encrypted = try await service.encrypt(data, using: key)
    XCTAssertNotEqual(data, encrypted)
}

Integration Tests¶

Service lifecycle
Error propagation
Recovery mechanisms
Security boundaries

7. Rollback Plan¶

Trigger Conditions¶

Critical security issues
Performance degradation
Stability problems
Data integrity issues

Rollback Steps¶

Revert to pre-XPC commits
Restore original service implementations
Update client code
Run validation tests

8. Success Criteria¶

Functional¶

All operations work through XPC
Error handling works correctly
Recovery mechanisms function
Performance meets targets

Security¶

Process isolation verified
Privilege separation effective
Sandbox rules working
Entitlements correct

Performance¶

Latency within bounds
Resource usage acceptable
Connection management efficient
Error recovery timely

9. Documentation Requirements¶

API Documentation¶

XPC protocol documentation
Error handling guidance
Security considerations
Best practices

Operational Documentation¶

Deployment guide
Monitoring guide
Troubleshooting guide
Recovery procedures

10. Future Enhancements¶

Planned Features¶

[ ] Enhanced monitoring
[ ] Performance metrics
[ ] Automatic recovery
[ ] Load balancing

Security Improvements¶

[ ] Additional sandbox rules
[ ] Enhanced audit logging
[ ] Security event monitoring
[ ] Threat detection

unction - Performance meets targets

Security¶

Process isolation verified
Privilege separation effective
Sandbox rules working
Entitlements correct

Performance¶

Latency within bounds
Resource usage acceptable
Connection management efficient
Error recovery timely

9. Documentation Requirements¶

API Documentation¶

XPC protocol documentation
Error handling guidance
Security considerations
Best practices

Operational Documentation¶

Deployment guide
Monitoring guide
Troubleshooting guide
Recovery procedures

10. Future Enhancements¶

Planned Features¶

[ ] Enhanced monitoring
[ ] Performance metrics
[ ] Automatic recovery
[ ] Load balancing

Security Improvements¶

[ ] Additional sandbox rules
[ ] Enhanced audit logging
[ ] Security event monitoring
[ ] Threat detection

Version History¶

Version	Date	Changes
1.0.0	2025-02-17	Initial XPC implementation plan document