security-testing-verification

What this skill does

# Security Testing & Verification

## Built-In Security Tests

This project includes automated tests and verification scripts for all security features.

## Testing Rate Limiting

### Automated Test Script

```bash
# Run the provided test script
node scripts/test-rate-limit.js
```

**What it tests:**
- Makes 10 consecutive requests to rate-limited endpoint
- Verifies first 5 succeed (HTTP 200)
- Verifies requests 6-10 are blocked (HTTP 429)
- Tests rate limit reset after 60 seconds

**Expected output:**
```
Testing Rate Limiting (5 requests/minute per IP)
Request  1: ✓ 200 - Success
Request  2: ✓ 200 - Success
Request  3: ✓ 200 - Success
Request  4: ✓ 200 - Success
Request  5: ✓ 200 - Success
Request  6: ✗ 429 - Too many requests
Request  7: ✗ 429 - Too many requests
Request  8: ✗ 429 - Too many requests
Request  9: ✗ 429 - Too many requests
Request 10: ✗ 429 - Too many requests

✓ Rate limiting is working correctly!
```

### Manual Testing

```bash
# Test rate limiting manually
for i in {1..10}; do
  echo "Request $i:"
  curl -s -o /dev/null -w "%{http_code}\n" \
    http://localhost:3000/api/test-rate-limit
  sleep 0.1
done

# Expected:
# Requests 1-5: 200
# Requests 6-10: 429
```

### Test Reset After Window

```bash
# Make 5 requests
for i in {1..5}; do
  curl http://localhost:3000/api/test-rate-limit
done

# Wait 61 seconds (rate limit window = 60 seconds)
sleep 61

# Try again - should succeed
curl http://localhost:3000/api/test-rate-limit

# Expected: 200 OK (limit reset)
```

## Testing CSRF Protection

### Test 1: Request Without Token (Should Fail)

```bash
curl -X POST http://localhost:3000/api/example-protected \
  -H "Content-Type: application/json" \
  -d '{"title": "test"}'

# Expected: 403 Forbidden
# {
#   "error": "CSRF token missing"
# }
```

### Test 2: Request With Valid Token (Should Succeed)

```bash
# Step 1: Get CSRF token
TOKEN=$(curl -s http://localhost:3000/api/csrf \
  -c cookies.txt | jq -r '.csrfToken')

# Step 2: Use token in request
curl -X POST http://localhost:3000/api/example-protected \
  -b cookies.txt \
  -H "Content-Type: application/json" \
  -H "X-CSRF-Token: $TOKEN" \
  -d '{"title": "test"}'

# Expected: 200 OK
```

### Test 3: Token Reuse (Should Fail)

```bash
# Get token
TOKEN=$(curl -s http://localhost:3000/api/csrf \
  -c cookies.txt | jq -r '.csrfToken')

# Use once (succeeds)
curl -X POST http://localhost:3000/api/example-protected \
  -b cookies.txt \
  -H "X-CSRF-Token: $TOKEN" \
  -d '{"title": "test"}'

# Try to reuse same token (should fail)
curl -X POST http://localhost:3000/api/example-protected \
  -b cookies.txt \
  -H "X-CSRF-Token: $TOKEN" \
  -d '{"title": "test2"}'

# Expected: 403 Forbidden - Token already used
```

### Test 4: Invalid Token (Should Fail)

```bash
curl -X POST http://localhost:3000/api/example-protected \
  -H "Content-Type: application/json" \
  -H "X-CSRF-Token: fake-token-12345" \
  -d '{"title": "test"}'

# Expected: 403 Forbidden
# {
#   "error": "CSRF token invalid"
# }
```

## Testing Input Validation

### Test XSS Sanitization

```bash
# Test script tags removal
curl -X POST http://localhost:3000/api/example-protected \
  -H "Content-Type: application/json" \
  -H "X-CSRF-Token: <get-token-first>" \
  -d '{"title": "<script>alert(1)</script>"}'

# Expected: 200 OK
# Title sanitized to: "alert(1)"
# < and > removed
```

### Test Length Validation

```bash
# Test too-long input
curl -X POST http://localhost:3000/api/example-protected \
  -H "Content-Type: application/json" \
  -H "X-CSRF-Token: <token>" \
  -d "{\"title\": \"$(printf 'A%.0s' {1..200})\"}"

# Expected: 400 Bad Request
# {
#   "error": "Validation failed",
#   "details": {
#     "title": "String must contain at most 100 character(s)"
#   }
# }
```

### Test Email Validation

```bash
curl -X POST http://localhost:3000/api/contact \
  -H "Content-Type: application/json" \
  -d '{
    "name": "Test User",
    "email": "not-an-email",
    "subject": "Test",
    "message": "Test message"
  }'

# Expected: 400 Bad Request
# {
#   "error": "Validation failed",
#   "details": {
#     "email": "Invalid email"
#   }
# }
```

### Test Required Fields

```bash
curl -X POST http://localhost:3000/api/contact \
  -H "Content-Type: application/json" \
  -d '{
    "name": "Test User"
  }'

# Expected: 400 Bad Request with missing field errors
```

## Testing Security Headers

### Test All Headers

```bash
curl -I http://localhost:3000

# Expected headers:
# Content-Security-Policy: default-src 'self'; ...
# X-Frame-Options: DENY
# X-Content-Type-Options: nosniff
# (HSTS only in production)
```

### Test CSP

```bash
# Check CSP includes required domains
curl -I http://localhost:3000 | grep "Content-Security-Policy"

# Should include:
# - script-src with Clerk domain
# - connect-src with Convex domain
# - frame-src with Stripe domain
```

### Test HSTS (Production Only)

```bash
# In production environment
curl -I https://yourapp.com | grep "Strict-Transport-Security"

# Should return:
# Strict-Transport-Security: max-age=31536000; includeSubDomains
```

### Test Protected Route Headers

```bash
curl -I http://localhost:3000/dashboard

# Should include:
# X-Robots-Tag: noindex, nofollow
```

## Testing Authentication

### Test Unauthenticated Access

```bash
# Try to access protected API without auth
curl http://localhost:3000/api/protected-endpoint

# Expected: 401 Unauthorized
# {
#   "error": "Unauthorized",
#   "message": "Authentication required"
# }
```

### Test Authenticated Access

```bash
# With valid Clerk session cookie
curl http://localhost:3000/api/protected-endpoint \
  -H "Cookie: __session=<clerk-session-token>"

# Expected: 200 OK (with authorized response)
```

### Test Authorization (Resource Ownership)

```bash
# Try to access another user's resource
curl http://localhost:3000/api/posts/user-abc-post-123 \
  -H "Cookie: __session=<different-user-token>"

# Expected: 403 Forbidden
# {
#   "error": "Forbidden",
#   "message": "You do not have access to this resource"
# }
```

### Test Subscription Gating

```bash
# Try premium feature with free account
curl http://localhost:3000/api/premium/generate \
  -H "Cookie: __session=<free-user-token>"

# Expected: 403 Forbidden
# {
#   "error": "Forbidden",
#   "message": "Premium subscription required"
# }
```

## Testing Error Handling

### Test Production Error Messages

```bash
# Set NODE_ENV=production temporarily
export NODE_ENV=production

# Trigger error in API
curl http://localhost:3000/api/error-test

# Expected: Generic message (no stack trace)
# {
#   "error": "Internal server error",
#   "message": "An unexpected error occurred"
# }
```

### Test Development Error Messages

```bash
# In development (NODE_ENV=development)
curl http://localhost:3000/api/error-test

# Expected: Detailed error with stack trace
# {
#   "error": "Internal server error",
#   "message": "Specific error message",
#   "stack": "Error: ...\n    at ...",
#   "context": "error-test"
# }
```

## Testing Dependency Security

### Run npm Audit

```bash
# Check for vulnerabilities
npm audit

# Expected: 0 vulnerabilities
# found 0 vulnerabilities
```

### Run Production Audit

```bash
# Only check production dependencies
npm audit --production

# Expected: 0 vulnerabilities
```

### Check Outdated Packages

```bash
npm outdated

# Expected: All packages up-to-date
# (or list of safe minor/patch updates available)
```

### Run Security Check Script

```bash
bash scripts/security-check.sh

# Expected:
# - 0 vulnerabilities
# - Minimal outdated packages
# - Fix commands if needed
```

## Online Security Testing Tools

### Security Headers Scanner

**Tool:** https://securityheaders.com/

**How to use:**
1. Deploy your app
2. Enter URL in Security Headers scanner
3. Check for A+ rating

**What it checks:**
- Content-Security-Policy
- X-Frame-Options
- X-Content-Type-Options
- Strict-Transport-Security
- Referrer-Policy
- Permissions-Policy

### Mozilla Observatory

**Tool:** htt