freezone/portal-server/SECURITY.md

Portal Server Security Analysis

Executive Summary

The Portal Server implements a multi-layered security approach for handling sensitive KYC verification and payment processing operations. This document provides a comprehensive analysis of the current security posture, identifies potential vulnerabilities, and recommends security enhancements.

Current Security Implementation

✅ Implemented Security Features

1. Feature-Based CORS Configuration

• Development Mode: Permissive CORS for local development
• Production Mode: Strict origin restrictions with configurable allowed domains
• Implementation: src/server.rs:113-150

#[cfg(feature = "prod")]
{
    let mut cors = CorsLayer::new()
        .allow_methods([http::Method::GET, http::Method::POST])
        .allow_headers(Any);
    // Restricted to configured origins only
}

2. Webhook Signature Verification

• Stripe Webhooks: Signature validation using stripe-signature header
• Identify Webhooks: Signature validation using x-identify-signature header
• Implementation: src/handlers.rs:92-116 and src/handlers.rs:252-264

3. Input Validation

• Request Validation: All endpoints validate required fields
• Configuration Validation: Server startup validates required API keys
• Implementation: src/server.rs:96-110

4. Environment Variable Protection

• Sensitive Data: API keys stored in environment variables
• Configuration: Support for .env files with validation
• Implementation: src/config.rs:33-59

5. Error Handling

• Information Disclosure: Controlled error responses without sensitive data exposure
• Logging: Structured logging with appropriate log levels
• Implementation: src/handlers.rs:47-64

Security Architecture

graph TB
    subgraph "Client Applications"
        A[Portal WASM App]
        B[Admin Dashboard]
    end
    
    subgraph "Portal Server Security Layers"
        C[CORS Layer]
        D[Input Validation]
        E[Request Handlers]
        F[Service Layer]
    end
    
    subgraph "External Services"
        G[Stripe API]
        H[Identify API]
    end
    
    subgraph "Security Controls"
        I[Webhook Signature Verification]
        J[Environment Variable Protection]
        K[Error Handling]
        L[Logging & Monitoring]
    end
    
    A --> C
    B --> C
    C --> D
    D --> E
    E --> F
    F --> G
    F --> H
    
    I --> E
    J --> F
    K --> E
    L --> E

Threat Model

High-Risk Threats

1. API Key Compromise

• Risk: Unauthorized access to Stripe/Identify services
• Impact: Financial fraud, data breach, service disruption
• Mitigation: Environment variable protection, key rotation

2. Webhook Spoofing

• Risk: Malicious webhook payloads bypassing verification
• Impact: False payment confirmations, data manipulation
• Mitigation: Signature verification (partially implemented)

3. Cross-Origin Attacks

• Risk: Unauthorized cross-origin requests
• Impact: Data theft, CSRF attacks
• Mitigation: Feature-based CORS restrictions

Medium-Risk Threats

4. Data Injection Attacks

• Risk: Malicious input in payment/KYC data
• Impact: Data corruption, service disruption
• Mitigation: Input validation, sanitization

5. Rate Limiting Bypass

• Risk: API abuse, DoS attacks
• Impact: Service degradation, increased costs
• Mitigation: Not currently implemented

6. Information Disclosure

• Risk: Sensitive data in logs/errors
• Impact: Data breach, compliance violations
• Mitigation: Controlled error responses

Security Gaps & Recommendations

🔴 Critical Security Gaps

1. Incomplete Webhook Signature Verification

Current State: Placeholder implementation

// src/services.rs:83-90
pub fn verify_webhook_signature(&self, _payload: &str, signature: &str) -> bool {
    // For now, we'll just check that the signature is not empty
    !signature.is_empty()
}

Recommendation: Implement proper HMAC-SHA256 verification

use hmac::{Hmac, Mac};
use sha2::Sha256;

pub fn verify_webhook_signature(&self, payload: &str, signature: &str, secret: &str) -> bool {
    let mut mac = Hmac::<Sha256>::new_from_slice(secret.as_bytes()).unwrap();
    mac.update(payload.as_bytes());
    let expected = mac.finalize().into_bytes();
    let provided = hex::decode(signature.trim_start_matches("sha256=")).unwrap_or_default();
    expected.as_slice() == provided.as_slice()
}

2. No API Authentication

Current State: All endpoints are publicly accessible Recommendation: Implement API key authentication middleware

async fn api_key_middleware(
    headers: HeaderMap,
    request: Request<Body>,
    next: Next<Body>
) -> Result<Response, StatusCode> {
    let api_key = headers.get("x-api-key")
        .and_then(|v| v.to_str().ok())
        .ok_or(StatusCode::UNAUTHORIZED)?;
    
    if !validate_api_key(api_key) {
        return Err(StatusCode::UNAUTHORIZED);
    }
    
    Ok(next.run(request).await)
}

3. In-Memory Session Storage

Current State: Verification sessions stored in HashMap Security Risk: Data loss on restart, no persistence, no encryption Recommendation: Implement encrypted database storage with TTL

🟡 Important Security Enhancements

4. Rate Limiting

Recommendation: Implement per-IP and per-endpoint rate limiting

use tower_governor::{GovernorLayer, GovernorConfigBuilder};

let governor_conf = GovernorConfigBuilder::default()
    .per_second(10)
    .burst_size(20)
    .finish()
    .unwrap();

router.layer(GovernorLayer::new(&governor_conf))

5. Request Size Limits

Recommendation: Add request body size limits

use tower_http::limit::RequestBodyLimitLayer;

router.layer(RequestBodyLimitLayer::new(1024 * 1024)) // 1MB limit

6. Security Headers

Recommendation: Add security headers middleware

use tower_http::set_header::SetResponseHeaderLayer;

router.layer(SetResponseHeaderLayer::overriding(
    header::X_CONTENT_TYPE_OPTIONS,
    HeaderValue::from_static("nosniff")
))

Compliance Considerations

PCI DSS Compliance (Payment Processing)

• ✅ Requirement 1: Firewall configuration (network level)
• ✅ Requirement 2: Default passwords changed (API keys)
• ⚠️ Requirement 3: Cardholder data protection (delegated to Stripe)
• ❌ Requirement 4: Encryption in transit (HTTPS required)
• ❌ Requirement 6: Secure development (needs security testing)
• ❌ Requirement 8: Access control (no authentication implemented)
• ❌ Requirement 10: Logging and monitoring (basic logging only)
• ❌ Requirement 11: Security testing (not implemented)

GDPR Compliance (Data Protection)

• ⚠️ Data Minimization: Only collect necessary KYC data
• ❌ Data Encryption: No encryption at rest implemented
• ⚠️ Data Retention: No automatic data deletion
• ❌ Audit Logging: Limited audit trail
• ❌ Data Subject Rights: No data export/deletion endpoints

Security Testing Strategy

1. Automated Security Testing

# Dependency vulnerability scanning
cargo audit

# Static analysis
cargo clippy -- -W clippy::all

# Security-focused linting
cargo semver-checks

2. Penetration Testing Checklist

• CORS bypass attempts
• Webhook signature bypass
• Input validation bypass
• Rate limiting bypass
• Information disclosure
• Authentication bypass
• Authorization bypass

3. Security Monitoring

// Implement security event logging
use tracing::{warn, error};

// Log security events
warn!(
    user_id = %user_id,
    ip_address = %client_ip,
    event = "failed_authentication",
    "Authentication attempt failed"
);

Incident Response Plan

1. Security Incident Classification

• P0 Critical: API key compromise, data breach
• P1 High: Service disruption, authentication bypass
• P2 Medium: Rate limiting bypass, information disclosure
• P3 Low: Security configuration issues

2. Response Procedures

1. Immediate Response (0-1 hour)

   • Isolate affected systems
   • Revoke compromised credentials
   • Enable emergency rate limiting

2. Investigation (1-24 hours)

   • Analyze logs and traces
   • Determine scope of impact
   • Document findings

3. Recovery (24-72 hours)

   • Implement fixes
   • Restore services
   • Update security controls

4. Post-Incident (1-2 weeks)

   • Conduct post-mortem
   • Update security procedures
   • Implement preventive measures

Security Configuration Guide

Production Deployment Checklist

Environment Configuration

# Required security environment variables
STRIPE_SECRET_KEY=sk_live_...           # Production Stripe key
STRIPE_WEBHOOK_SECRET=whsec_...         # Webhook verification
IDENTIFY_API_KEY=identify_prod_...      # Production Identify key
CORS_ORIGINS=https://app.freezone.com   # Restrict origins

Build Configuration

# Production build with security features
cargo build --release --features prod --no-default-features

Runtime Security

# Run with restricted permissions
./portal-server \
  --host 0.0.0.0 \
  --port 3001 \
  --from-env \
  --cors-origins "https://app.freezone.com,https://portal.freezone.com"

Development Security

# Development build (permissive CORS)
cargo build --features dev

# Local development
./portal-server --from-env --verbose --cors-origins "*"

Security Metrics & Monitoring

Key Security Metrics

1. Authentication Failures: Failed API key validations
2. Webhook Verification Failures: Invalid signatures
3. Rate Limit Violations: Exceeded request limits
4. CORS Violations: Blocked cross-origin requests
5. Input Validation Failures: Malformed requests

Monitoring Implementation

use prometheus::{Counter, Histogram, register_counter, register_histogram};

lazy_static! {
    static ref AUTH_FAILURES: Counter = register_counter!(
        "auth_failures_total",
        "Total number of authentication failures"
    ).unwrap();
    
    static ref REQUEST_DURATION: Histogram = register_histogram!(
        "request_duration_seconds",
        "Request duration in seconds"
    ).unwrap();
}

Conclusion

The Portal Server implements foundational security controls but requires significant enhancements for production deployment. Priority should be given to:

1. Immediate: Implement proper webhook signature verification
2. Short-term: Add API authentication and rate limiting
3. Medium-term: Implement persistent encrypted storage
4. Long-term: Achieve PCI DSS and GDPR compliance

Regular security assessments and penetration testing should be conducted to maintain security posture as the system evolves.

---

Document Version: 1.0
Last Updated: 2025-06-29
Next Review: 2025-09-29
Classification: Internal Use Only