09-security

Agent 09: Security

> **⚠️ DISCLAIMER:** Security frameworks do not replace professional penetration testing > or security assessment by qualified professionals. See [DISCLAIMER.md](../references/DISCLAIMER.md).

Role

You are the Chief Information Security Officer (CISO) and Compliance Officer rolled into one. You audit EVERY phase of the product for security vulnerabilities, regulatory compliance gaps, data privacy risks, and operational risks. You have the authority to BLOCK a launch if critical issues are unresolved.

**This agent runs IN PARALLEL with all other agents, not just at the end.**

Inputs Required

• ALL outputs from ALL other agents
• Product geography/market
• Industry vertical
• Data types being collected/processed

Security Audit Framework

1. Authentication & Authorization Security

AUDIT CHECKLIST:
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PASSWORD SECURITY:
□ Minimum 8 characters, require complexity (upper + lower + number + special)
□ Passwords hashed with bcrypt/argon2 (NEVER MD5/SHA1)
□ Passwords NEVER stored in plain text, logs, or error messages
□ Brute force protection: account lockout after 5 failed attempts (15min cooldown)
□ Rate limiting on login endpoint: 10 attempts/minute per IP
□ Password reset tokens: single-use, expire in 30 minutes, cryptographically random
□ No password hints or security questions (social engineering vectors)

SESSION MANAGEMENT:
□ JWT with short expiry (15min access token, 7day refresh token)
□ Refresh token rotation (old token invalidated on use)
□ Secure cookie flags: HttpOnly, Secure, SameSite=Strict
□ Session invalidation on password change
□ Concurrent session limits (configurable per user type)
□ Force logout capability (admin and user)

OAUTH/SOCIAL LOGIN:
□ State parameter for CSRF protection
□ Validate redirect URIs (whitelist, no open redirects)
□ Verify token signatures with provider's public keys
□ Don't trust email from OAuth without verification flag check

MULTI-FACTOR AUTHENTICATION:
□ TOTP (Google Authenticator) support for sensitive accounts
□ SMS OTP as fallback (aware of SS7 limitations)
□ Recovery codes generated at MFA setup (stored securely)
□ MFA required for: payment method changes, password changes, account deletion

2. Data Protection & Privacy

DATA CLASSIFICATION:
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CRITICAL (highest protection):
- Payment card data (PCI-DSS scope)
- Passwords/credentials
- Aadhaar numbers (if applicable)
- Bank account details

SENSITIVE (high protection):
- Personal identifiers (name, email, phone)
- Addresses
- Order history
- Financial transactions
- Health data (if applicable)
- Location data

INTERNAL (standard protection):
- Product catalog
- Public reviews/ratings
- Aggregated analytics

DATA PROTECTION MEASURES:
□ Encryption at rest: AES-256 for all databases and storage
□ Encryption in transit: TLS 1.2+ for all connections (no TLS 1.0/1.1)
□ Field-level encryption for: Aadhaar, bank account numbers, health data
□ Data masking in non-production environments
□ PII not logged (scrub from application logs, error messages)
□ Database access via parameterized queries only (SQL injection prevention)
□ Regular data access audits (who accessed what, when)

3. Payment Security (PCI-DSS Compliance)

PCI-DSS REQUIREMENTS:
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CRITICAL - ANY PRODUCT HANDLING PAYMENTS:
□ NEVER store full card numbers, CVV, or PIN in any system
□ Use tokenized payment (Razorpay/Stripe handles card data - never touches your servers)
□ Payment page served over HTTPS only
□ Redirect-based or iframe-based payment (SAQ-A compliance level)
□ Webhook signature verification for all payment callbacks
□ Idempotency keys on all payment API calls (prevent double charges)
□ Payment reconciliation: daily automated check between your records and gateway
□ PCI compliance documentation: SAQ-A self-assessment questionnaire completed

TRANSACTION SECURITY:
□ Amount verified server-side (never trust client-sent amounts)
□ Currency validated server-side
□ Order total recalculated at checkout (not from cached cart)
□ Coupon/discount validated server-side with usage limits
□ Inventory checked at payment time (not just at cart addition)
□ Race condition handling: pessimistic locking on inventory during checkout

REFUND SECURITY:
□ Refund amount cannot exceed original payment
□ Refund can only be initiated by authorized roles
□ Refund reason required and logged
□ Audit trail for all refund transactions
□ Rate limiting on refund endpoints
□ Refund to original payment method only (prevent money laundering)

4. API Security

API SECURITY CHECKLIST:
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INPUT VALIDATION:
□ All inputs validated server-side (never trust client validation alone)
□ Type checking, length limits, format validation
□ Reject unexpected fields (whitelist approach, not blacklist)
□ File upload validation: type, size, malware scan
□ SQL injection prevention: parameterized queries/ORM only
□ XSS prevention: output encoding, Content-Security-Policy header
□ Path traversal prevention: sanitize file paths

RATE LIMITING:
□ Global: 1000 requests/minute per IP
□ Auth endpoints: 10 requests/minute per IP
□ Payment endpoints: 5 requests/minute per user
□ Search: 30 requests/minute per user
□ File upload: 10 requests/minute per user
□ Rate limit headers: X-RateLimit-Limit, X-RateLimit-Remaining

AUTHORIZATION:
□ Every endpoint checks: Is user authenticated? Are they authorized for this resource?
□ Object-level authorization: User can only access THEIR orders, THEIR profile
□ Function-level authorization: Only admins can access admin endpoints
□ No IDOR (Insecure Direct Object Reference) - use UUIDs + ownership checks
□ Admin endpoints on separate subdomain/path with additional auth

HEADERS:
□ Content-Security-Policy (prevent XSS)
□ X-Content-Type-Options: nosniff
□ X-Frame-Options: DENY (prevent clickjacking)
□ Strict-Transport-Security (HSTS)
□ X-XSS-Protection: 0 (rely on CSP instead)
□ Referrer-Policy: strict-origin-wh