This document outlines the security improvements made to the Health Companion application.

1. Set up environment variables

   cp .env.example .env
   # Edit .env with your actual Supabase credentials

2. Run database migrations

   # Connect to your Supabase project
   # Go to SQL Editor and run migrations in order:
   # - 001_create_healthcare_schema.sql
   # - 002_create_audit_logs.sql

3. Install dependencies

   npm install

4. Enable HIPAA mode in Supabase

   • Upgrade to Supabase Pro plan (required for BAA)
   • Request HIPAA BAA from Supabase
   • Enable encryption at rest
   • Configure SSL enforcement

All sensitive configuration now uses environment variables:

• VITE_SUPABASE_URL - Supabase project URL
• VITE_SUPABASE_ANON_KEY - Public anonymous key
• SUPABASE_SERVICE_ROLE_KEY - Service role key (server only)

Never commit .env files to version control.

All tables have RLS policies ensuring users can only access their own data:

-- Example policy
CREATE POLICY "Users can view their own data"
  ON medications FOR SELECT
  USING (auth.uid() = user_id);

Replaced KV store pattern with proper normalized tables for:

• Better data integrity
• Improved query performance
• Easier backup and recovery
• HIPAA compliance

All user input is validated using Zod schemas before processing:

import { validateData, medicationSchema } from '@/lib/validations';

const result = validateData(medicationSchema, formData);
if (!result.success) {
  // Handle validation errors
  console.error(result.errors);
  return;
}
// Use validated data
const medication = result.data;

Available schemas:

• profileSchema
• medicationSchema
• healthcareProviderSchema
• emergencyContactSchema
• appointmentSchema
• labResultSchema
• vitalSignsSchema
• symptomSchema
• messageSchema
• healthGoalSchema
• insurancePolicySchema
• medicalDocumentSchema

Input sanitization prevents Cross-Site Scripting attacks:

import { sanitizeString } from '@/lib/validations';

const safeName = sanitizeString(userInput);

For HTML content, use DOMPurify:

import DOMPurify from 'dompurify';

const safeHTML = DOMPurify.sanitize(userHTML);

React error boundaries catch and handle errors gracefully:

import { ErrorBoundary } from '@/components/ErrorBoundary';

<ErrorBoundary>
  <YourComponent />
</ErrorBoundary>

Features:

• Prevents app crashes
• User-friendly error messages
• No PHI in error logs (HIPAA compliant)
• Automatic error reporting in production

HIPAA-compliant audit logging tracks all PHI access:

import { audit, AuditAction, ResourceType } from '@/lib/auditLog';

// Log profile view
await audit.accessPHI(
  userId,
  ResourceType.PROFILE,
  profileId
);

// Log data modification
await audit.modifyPHI(
  userId,
  ResourceType.MEDICATION,
  medicationId,
  'update'
);

// Log unauthorized access attempt
await audit.unauthorizedAccess(
  userId,
  ResourceType.DOCUMENT,
  documentId
);

Important: Never pass PHI to audit functions. Only log metadata (IDs, types, timestamps).

See HIPAA_COMPLIANCE.md for full details.

1. Encryption

   • ✅ In transit: HTTPS/TLS
   • ✅ At rest: PostgreSQL encryption
   • ✅ Passwords: bcrypt hashing

2. Access Controls

   • ✅ Authentication required
   • ✅ RLS policies enforced
   • ✅ Session timeouts
   • ⚠️ MFA recommended (configure via Supabase)

3. Audit Logs

   • ✅ All PHI access logged
   • ✅ 7-year retention
   • ✅ Immutable logs

4. Business Associates

   • ⚠️ Obtain BAA from Supabase (Pro plan)
   • ⚠️ Sign BAAs with any other vendors

import { audit, ResourceType } from '@/lib/auditLog';

async function fetchPatientData(userId: string, patientId: string) {
  try {
    // Fetch data
    const response = await fetch(`/api/patients/${patientId}`, {
      headers: { Authorization: `Bearer ${token}` }
    });

    if (!response.ok) {
      await audit.unauthorizedAccess(userId, ResourceType.PROFILE, patientId);
      throw new Error('Unauthorized access');
    }

    // Log successful access
    await audit.accessPHI(userId, ResourceType.PROFILE, patientId);

    const data = await response.json();
    return data;
  } catch (error) {
    // Log error without PHI
    console.error('Failed to fetch patient data');
    throw error;
  }
}

import { useForm } from 'react-hook-form';
import { zodResolver } from '@hookform/resolvers/zod';
import { medicationSchema } from '@/lib/validations';

function MedicationForm() {
  const form = useForm({
    resolver: zodResolver(medicationSchema),
    defaultValues: {
      name: '',
      dosage: '',
      frequency: ''
    }
  });

  const onSubmit = async (data: z.infer<typeof medicationSchema>) => {
    // Data is automatically validated
    await saveMedication(data);
  };

  return (
    <form onSubmit={form.handleSubmit(onSubmit)}>
      {/* Form fields */}
    </form>
  );
}

const MAX_FILE_SIZE = 10 * 1024 * 1024; // 10MB
const ALLOWED_TYPES = [
  'image/jpeg',
  'image/png',
  'application/pdf',
  'text/plain'
];

function validateFile(file: File): boolean {
  // Check file size
  if (file.size > MAX_FILE_SIZE) {
    throw new Error('File too large (max 10MB)');
  }

  // Check file type
  if (!ALLOWED_TYPES.includes(file.type)) {
    throw new Error('Invalid file type');
  }

  // Additional: scan for malware in production
  return true;
}

• All environment variables configured
• Database migrations applied
• RLS policies tested
• Supabase BAA obtained
• Audit logging verified
• Session timeout configured (30 min)
• HTTPS/SSL enforced
• Error boundaries in place
• Input validation on all forms
• File upload restrictions configured
• Rate limiting enabled
• CORS properly configured
• Security headers configured

• Review audit logs monthly
• Rotate API keys quarterly
• Update dependencies monthly
• Security audit annually
• Penetration testing annually
• Staff HIPAA training annually
• Review BAAs annually
• Test backup/recovery quarterly

If you suspect a security breach:

1. Immediate (< 1 hour)

   • Isolate affected systems
   • Preserve evidence
   • Notify Security Officer

2. Assessment (< 24 hours)

   • Review audit logs
   • Identify affected data
   • Determine scope

3. Notification (< 60 days)

   • Notify affected individuals
   • Report to authorities if required
   • Document incident

# Install security audit tools
npm install -g snyk
npm install -g npm-audit

# Run security scans
npm audit
snyk test

# Check for vulnerable dependencies
npm audit fix

Consider hiring professional penetration testers annually:

• OWASP Top 10 testing
• SQL injection testing
• XSS vulnerability testing
• Authentication bypass attempts
• Authorization testing

• HIPAA Compliance Guide
• Supabase Security
• OWASP Top 10

• Supabase Dashboard
• Snyk - Dependency scanning
• OWASP ZAP - Penetration testing

• Security Officer: [DESIGNATE]
• Privacy Officer: [DESIGNATE]
• Incident Response: [SETUP HOTLINE]

Last Updated: 2025-10-03 Version: 1.0