pii-policy-enforcement

PII Policy Enforcement

Overview

Policy และ mechanisms สำหรับ detect, classify และ protect PII (Personally Identifiable Information) ใน data platform

Why This Matters

• Compliance: GDPR, CCPA requirements
• Privacy: Protect user data
• Security: Prevent data leaks
• Trust: Build customer confidence

PII Classification

Levels

Level 1 - Public: Name, job title
Level 2 - Internal: Employee ID, department
Level 3 - Confidential: Email, phone, address
Level 4 - Restricted: SSN, credit card, health data

Auto-Detection

from presidio_analyzer import AnalyzerEngine

analyzer = AnalyzerEngine()

# Detect PII
text = "John's email is john@example.com and SSN is 123-45-6789"
results = analyzer.analyze(text, language='en')

for result in results:
    print(f"{result.entity_type}: {result.score}")
# Output:
# EMAIL_ADDRESS: 0.95
# US_SSN: 0.85

Enforcement Mechanisms

1. Column-Level Encryption

-- Encrypt PII columns
CREATE TABLE users (
  id UUID PRIMARY KEY,
  email VARCHAR ENCRYPTED,  -- Auto-encrypt
  ssn VARCHAR ENCRYPTED,
  name VARCHAR  -- Not encrypted
);

2. Row-Level Security

-- Only show PII to authorized users
CREATE POLICY pii_access ON users
  USING (
    current_user IN (SELECT user_id FROM pii_authorized_users)
    OR is_admin(current_user)
  );

3. Data Masking

def mask_pii(data: dict) -> dict:
    """Mask PII fields"""
    masked = data.copy()
    
    if 'email' in masked:
        masked['email'] = mask_email(masked['email'])
        # john@example.com → j***@example.com
    
    if 'ssn' in masked:
        masked['ssn'] = mask_ssn(masked['ssn'])
        # 123-45-6789 → ***-**-6789
    
    return masked

Access Control

# pii-policy.yaml
policies:
  - name: email_access
    resource: users.email
    allowed_roles:
      - admin
      - customer_support
    audit: true
  
  - name: ssn_access
    resource: users.ssn
    allowed_roles:
      - admin
    require_mfa: true
    audit: true
    alert: true

Audit Logging

# Log all PII access
def log_pii_access(user_id: str, resource: str, action: str):
    audit_log.write({
        'timestamp': datetime.now(),
        'user_id': user_id,
        'resource': resource,
        'action': action,
        'ip_address': request.ip,
        'success': True
    })

# Example
@require_pii_access('users.email')
def get_user_email(user_id: str):
    log_pii_access(current_user.id, f'users.{user_id}.email', 'read')
    return db.query('SELECT email FROM users WHERE id = ?', user_id)

Summary

PII Policy: Protect sensitive personal data

Classification:

• Level 1-4 (Public → Restricted)
• Auto-detection (Presidio)

Enforcement:

• Column encryption
• Row-level security
• Data masking
• Access control

Compliance:

• Audit logging
• Access reviews
• Data retention
• Right to deletion