# Security Policy
## Overview
This MCP server is designed with security as a top priority. This document outlines the security measures implemented and best practices for deployment.
## Security Features
### Container Security
1. **Non-Root User Execution**
- Container runs as UID 1000 (non-root)
- User and group `mcp` created specifically for the application
- Prevents privilege escalation attacks
2. **Read-Only Root Filesystem**
- Root filesystem is mounted as read-only
- Only `/tmp` and `/home/mcp` are writable (via tmpfs)
- Prevents unauthorized file modifications
3. **Dropped Capabilities**
- All Linux capabilities are dropped
- `allowPrivilegeEscalation: false` prevents gaining additional privileges
- Minimal attack surface
4. **Seccomp Profile**
- Uses the RuntimeDefault seccomp profile
- Restricts system calls available to the container
### Kubernetes Security
1. **Pod Security Standards**
- Implements restricted Pod Security Standards
- Non-root execution enforced
- No host namespace access
2. **Network Policies**
- Restricts ingress to only necessary services
- Limits egress to DNS, Sonarr, and Radarr
- Default deny policy
3. **Secrets Management**
- API keys stored in Kubernetes Secrets
- Secrets mounted as environment variables
- Never stored in container images or ConfigMaps
4. **Resource Limits**
- CPU and memory limits prevent resource exhaustion
- Protects cluster from DoS scenarios
### Application Security
1. **API Key Protection**
- API keys never logged
- Transmitted only in HTTP headers
- Not exposed in error messages
2. **Input Validation**
- All user inputs validated
- Type checking via Pydantic models
- Prevents injection attacks
3. **Error Handling**
- Sensitive information not exposed in errors
- Proper exception handling throughout
- Graceful degradation
4. **HTTP Security**
- Request timeouts configured
- Connection pooling managed
- No credential exposure in URLs
## Deployment Best Practices
### API Key Management
**DO:**
- Use Kubernetes Secrets for production
- Rotate API keys regularly (every 90 days recommended)
- Use separate API keys per environment
- Limit API key permissions in Sonarr/Radarr
- Enable audit logging for API key usage
**DON'T:**
- Store API keys in version control
- Share API keys between environments
- Use the same key for multiple services
- Log API keys
- Include API keys in container images
### Network Security
**DO:**
- Use TLS/HTTPS for Sonarr/Radarr connections
- Implement network policies
- Restrict ingress to trusted sources only
- Use private networks when possible
- Enable mutual TLS if available
**DON'T:**
- Expose services directly to the internet
- Allow unrestricted egress
- Use plain HTTP for sensitive data
- Disable SSL verification
### Container Security
**DO:**
- Scan images for vulnerabilities regularly
- Use minimal base images
- Keep dependencies updated
- Use specific version tags (avoid `latest`)
- Sign container images
**DON'T:**
- Run containers as root
- Use privileged containers
- Mount host filesystem
- Disable security features
- Use outdated base images
### Kubernetes Security
**DO:**
- Enable Pod Security Admission
- Use RBAC with least privilege
- Implement network policies
- Enable audit logging
- Use namespaces for isolation
**DON'T:**
- Grant cluster-admin unnecessarily
- Use default service accounts
- Expose sensitive ports
- Disable security policies
- Mix environments in same namespace
## Vulnerability Reporting
If you discover a security vulnerability, please:
1. **DO NOT** open a public issue
2. Email security details to: [your-security-email]
3. Include:
- Description of the vulnerability
- Steps to reproduce
- Potential impact
- Suggested fix (if any)
We will respond within 48 hours and work with you to address the issue.
## Security Updates
### Checking for Updates
Monitor these sources for security updates:
- Python dependencies: `pip list --outdated`
- Base image: Check Python Docker Hub releases
- MCP SDK: Check Anthropic's repository
### Update Process
1. Review release notes for security fixes
2. Test updates in non-production environment
3. Update `requirements.txt` with specific versions
4. Rebuild container image
5. Scan for vulnerabilities
6. Deploy to production
### Update Schedule
- **Critical vulnerabilities**: Immediate update
- **High severity**: Within 7 days
- **Medium severity**: Within 30 days
- **Low severity**: Next regular update cycle
## Security Checklist
### Pre-Deployment
- [ ] API keys generated and stored securely
- [ ] Network policies reviewed and tested
- [ ] Resource limits configured
- [ ] Security contexts verified
- [ ] Image scanned for vulnerabilities
- [ ] Secrets properly configured
- [ ] TLS/HTTPS enabled for services
- [ ] Documentation reviewed
### Post-Deployment
- [ ] Verify non-root execution
- [ ] Check network policies are enforced
- [ ] Confirm secrets are not exposed
- [ ] Test API connectivity
- [ ] Review logs for errors
- [ ] Verify resource limits
- [ ] Test failover scenarios
### Ongoing
- [ ] Monitor security advisories
- [ ] Rotate API keys quarterly
- [ ] Update dependencies monthly
- [ ] Review access logs weekly
- [ ] Scan for vulnerabilities monthly
- [ ] Conduct security audits annually
## Compliance
### Data Handling
This MCP server:
- Does NOT store media files
- Does NOT log sensitive information
- Does NOT retain API responses
- Operates in-memory only
- Has no persistent storage
### Audit Logging
For compliance requirements:
1. Enable Kubernetes audit logging
2. Monitor API access patterns
3. Log authentication attempts
4. Track configuration changes
5. Implement log retention policies
## Known Limitations
1. **API Key Security**: Keys stored in environment variables (use secrets manager for enhanced security)
2. **Network Access**: Requires network access to Sonarr/Radarr (use mTLS for enhanced security)
3. **Read-Only Operations**: Most operations are read-only, but some modify metadata
## Security Hardening
### Additional Steps (Optional)
1. **AppArmor/SELinux**
- Configure mandatory access control
- Create custom profiles
2. **Image Signing**
- Sign images with Cosign
- Implement admission controller
3. **Runtime Security**
- Deploy Falco for runtime monitoring
- Configure security alerts
4. **Secrets Management**
- Use HashiCorp Vault
- Implement External Secrets Operator
5. **Network Security**
- Implement service mesh (Istio, Linkerd)
- Enable mutual TLS
- Use network segmentation
## References
- [Kubernetes Security Best Practices](https://kubernetes.io/docs/concepts/security/pod-security-standards/)
- [OWASP Docker Security Cheat Sheet](https://cheatsheetseries.owasp.org/cheatsheets/Docker_Security_Cheat_Sheet.html)
- [CIS Kubernetes Benchmark](https://www.cisecurity.org/benchmark/kubernetes)
- [Python Security Best Practices](https://python.readthedocs.io/en/stable/library/security.html)
## Contact
For security questions or concerns:
- Email: [your-security-email]
- Security advisories: [GitHub Security Advisories URL]
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Last Updated: 2025-11-26
