# LifeTimer Security Audit Report

**Date:** 2026-01-03  
**Auditor:** Cascade  
**Version:** 1.0.0

## Executive Summary

The LifeTimer application demonstrates good security practices overall. The codebase follows Supabase security best practices with proper environment variable management, Row Level Security (RLS) policies, and secure authentication flows. No critical vulnerabilities were found.

## Security Findings

### ✅ Passed Checks

#### 1. Secrets Management
- **Status:** PASS
- **Details:** All sensitive configuration uses `String.fromEnvironment()` for build-time injection
- **Location:** `lib/bootstrap/env.dart`
- **Evidence:** 
  - `SUPABASE_URL`, `SUPABASE_ANON_KEY`, `UNSPLASH_ACCESS_KEY`, `PEXELS_API_KEY` all use environment variables
  - No hardcoded secrets found in the codebase
  - Only public anon key is used (not service role key)

#### 2. Authentication & Authorization
- **Status:** PASS
- **Details:** Proper OAuth implementation through Supabase Auth
- **Location:** `lib/data/repositories/auth_repository.dart`
- **Evidence:**
  - Email/password authentication properly handled
  - Google OAuth using `google_sign_in` package with proper token flow
  - Apple OAuth using `sign_in_with_apple` package
  - Session validation and refresh implemented
  - User ID properly extracted from authenticated session

#### 3. Database Security (SQL Injection Prevention)
- **Status:** PASS
- **Details:** All database queries use Supabase's parameterized query builder
- **Location:** All repository files in `lib/data/repositories/`
- **Evidence:**
  - No raw SQL queries found
  - All queries use `.eq()`, `.select()`, `.insert()`, `.update()`, `.delete()` methods
  - User input is properly escaped by Supabase client
  - RLS policies configured on database side (see migration files)

#### 4. Input Validation
- **Status:** PASS
- **Details:** Comprehensive input validation implemented
- **Location:** `lib/core/utils/validators.dart`
- **Evidence:**
  - Email validation with regex
  - Password length validation (min 6 characters)
  - Username validation (3-20 chars, alphanumeric + underscore)
  - Goal title and description length limits
  - Progress range validation (0-100)

#### 5. HTTPS/TLS
- **Status:** PASS
- **Details:** All external API calls use HTTPS
- **Location:** `lib/data/services/image_search_service.dart`, `lib/data/services/pexels_image_search_service.dart`
- **Evidence:**
  - `Uri.https()` used for Unsplash API
  - `Uri.https()` used for Pexels API
  - No HTTP URLs found in codebase

#### 6. Data Access Control
- **Status:** PASS
- **Details:** Proper user isolation in data access
- **Evidence:**
  - All queries include `.eq('owner_id', userId)` or `.eq('id', userId)`
  - Public profile visibility properly checked before exposing data
  - Social features only show public profiles

#### 7. No Code Injection Risks
- **Status:** PASS
- **Details:** No dangerous code execution patterns found
- **Evidence:**
  - No `eval()`, `exec()`, or `runJavascript()` calls
  - No dynamic code generation
  - Function types used only for callbacks (not execution)

### ⚠️ Medium Priority Issues

#### 1. Logging with print() Statements
- **Severity:** Medium
- **Location:** 
  - `lib/core/services/analytics_service.dart` (lines 23, 34)
  - `lib/data/services/offline_mutation_queue.dart` (line 69)
- **Issue:** Using `print()` for logging in production code
- **Recommendation:** Replace with proper logging framework (e.g., `logger` package) with configurable log levels
- **Impact:** Minimal - current logs don't expose sensitive data

#### 2. Analytics Service Placeholder
- **Severity:** Low
- **Location:** `lib/core/services/analytics_service.dart`
- **Issue:** Analytics service is a placeholder implementation
- **Recommendation:** Integrate with proper analytics service (e.g., Firebase Analytics, Mixpanel) before production
- **Impact:** No analytics data collection currently

### ℹ️ Recommendations

#### Security Best Practices
1. **Implement Proper Logging Framework**
   - Add `logger` package to `pubspec.yaml`
   - Replace all `print()` statements with logger calls
   - Configure log levels for debug/release builds

2. **Add Certificate Pinning (Optional)**
   - Consider implementing certificate pinning for critical API calls
   - Mitigates man-in-the-middle attacks

3. **Add Rate Limiting (Server-Side)**
   - Implement rate limiting on Supabase Edge Functions
   - Prevent abuse of API endpoints

4. **Add Security Headers**
   - Configure CORS headers in Supabase
   - Add CSP headers if using web views

5. **Regular Security Audits**
   - Schedule quarterly security audits
   - Update dependencies regularly
   - Monitor security advisories

#### Privacy Considerations
1. **Data Minimization**
   - Review collected data and ensure only necessary data is stored
   - Implement data retention policies

2. **User Consent**
   - Ensure proper consent mechanisms for analytics
   - Provide opt-out options

3. **Account Deletion**
   - Account deletion already implemented in `UserRepository`
   - Ensure all user data is properly deleted (cascade deletes)

## Compliance Checklist

- [x] No hardcoded secrets
- [x] Proper authentication implementation
- [x] SQL injection prevention
- [x] Input validation
- [x] HTTPS/TLS encryption
- [x] User data isolation
- [x] No code injection risks
- [x] RLS policies configured (database level)
- [x] Account deletion implemented
- [ ] Proper logging framework (recommended)
- [ ] Analytics integration (recommended)

## Conclusion

The LifeTimer application demonstrates strong security fundamentals. The use of Supabase with RLS policies, proper environment variable management, and parameterized queries provides a solid security foundation. The medium-priority issues are minor and can be addressed before production deployment.

**Overall Security Rating:** A- (Good)

**Recommendation:** Address logging framework integration before production launch. All other security practices are sound.

---

**Next Steps:**
1. Integrate logging framework
2. Complete code review
3. Perform penetration testing (optional)
4. Finalize app store submission
