policy-security.md

Policy Security Guidelines

This document provides comprehensive guidelines for creating, managing, and securing policies within the DevSecOps Policy Scanner (DSP Scanner) framework.

Table of Contents

• Overview
• Policy Development Security
• Policy Validation
• Policy Deployment
• Policy Monitoring
• Policy Maintenance
• Security Best Practices
• Compliance Considerations

Overview

Policies are the core security controls in the DSP Scanner. This guide ensures that policies are developed, deployed, and maintained securely to protect your infrastructure and applications.

Policy Security Principles

• Secure by Design: Policies should be secure from the ground up
• Least Privilege: Policies should enforce minimal necessary permissions
• Defense in Depth: Multiple layers of policy controls
• Continuous Validation: Regular policy security assessments
• Audit Trail: Complete policy change tracking

Policy Development Security

Secure Policy Structure

# Example secure policy structure
package dsp_scanner.kubernetes.security

# Import security utilities
import data.dsp_scanner.security.utils

# Define secure policy metadata
__rego_metadata__ := {
    "title": "Kubernetes Security Policy",
    "description": "Enforces security best practices for Kubernetes resources",
    "version": "1.0.0",
    "author": "Security Team",
    "contact": "security@company.com",
    "severity": "high",
    "tags": ["security", "kubernetes", "compliance"],
    "references": [
        "https://kubernetes.io/docs/concepts/security/pod-security-standards/",
        "https://www.cisecurity.org/benchmark/kubernetes/"
    ]
}

# Main policy rules
deny[msg] {
    # Check for privileged containers
    input.spec.containers[_].securityContext.privileged == true
    
    msg := {
        "title": "Privileged Container Detected",
        "description": "Containers should not run with privileged access",
        "severity": "HIGH",
        "platform": "kubernetes",
        "resource": input.metadata.name,
        "namespace": input.metadata.namespace,
        "recommendation": "Remove privileged flag or use security contexts",
        "compliance": {
            "cis": ["5.2.1"],
            "nist": ["AC-6"],
            "pci": ["7.1"]
        }
    }
}

# Additional security checks
deny[msg] {
    # Check for host network access
    input.spec.hostNetwork == true
    
    msg := {
        "title": "Host Network Access Detected",
        "description": "Pods should not use host network",
        "severity": "MEDIUM",
        "platform": "kubernetes",
        "resource": input.metadata.name,
        "namespace": input.metadata.namespace,
        "recommendation": "Remove hostNetwork or use network policies",
        "compliance": {
            "cis": ["5.2.4"],
            "nist": ["SC-7"]
        }
    }
}

Policy Input Validation

# Input validation policy
package dsp_scanner.validation

# Validate policy inputs
validate_input[msg] {
    # Check for required fields
    not input.metadata
    msg := "Missing metadata section"
}

validate_input[msg] {
    # Check for required metadata fields
    not input.metadata.name
    msg := "Missing resource name"
}

validate_input[msg] {
    # Check for valid namespace
    input.metadata.namespace == "default"
    msg := "Resources should not be in default namespace"
}

validate_input[msg] {
    # Check for valid labels
    not input.metadata.labels.app
    msg := "Missing app label"
}

Policy Output Sanitization

# Output sanitization
package dsp_scanner.sanitization

# Sanitize sensitive data
sanitize_output[output] {
    # Remove sensitive fields
    output := {
        "metadata": {
            "name": input.metadata.name,
            "namespace": input.metadata.namespace,
            "labels": input.metadata.labels
        },
        "spec": {
            "containers": [container | container := input.spec.containers[_]; not contains(container, "secret")]
        }
    }
}

# Check for sensitive data
contains_sensitive_data[field] {
    sensitive_fields := ["password", "secret", "token", "key", "credential"]
    field := sensitive_fields[_]
    contains(input, field)
}

Policy Validation

Policy Syntax Validation

# Validate policy syntax
dsp-scanner validate policies/security.yaml

# Check policy structure
dsp-scanner lint policies/

# Validate against schema
dsp-scanner validate --schema policies/schema.json policies/

# Test policy logic
dsp-scanner test policies/ --test-data test-data/

Policy Security Validation

# Security validation
dsp-scanner validate --security policies/

# Check for common vulnerabilities
dsp-scanner validate --vulnerabilities policies/

# Validate policy permissions
dsp-scanner validate --permissions policies/

# Check policy complexity
dsp-scanner validate --complexity policies/

Policy Testing

# Test configuration
tests:
  # Unit tests
  unit:
    - name: "test-privileged-containers"
      input: "test-data/privileged-pod.yaml"
      expected: "DENY"
      description: "Should deny privileged containers"
    
    - name: "test-host-network"
      input: "test-data/host-network-pod.yaml"
      expected: "DENY"
      description: "Should deny host network access"
  
  # Integration tests
  integration:
    - name: "test-complete-workload"
      input: "test-data/complete-workload.yaml"
      expected: "ALLOW"
      description: "Should allow secure workload"
  
  # Security tests
  security:
    - name: "test-policy-injection"
      input: "test-data/malicious-policy.yaml"
      expected: "DENY"
      description: "Should deny malicious policy"

Policy Deployment

Secure Deployment Process

# Deployment configuration
deployment:
  # Staging environment
  staging:
    enabled: true
    policies: "policies/staging/"
    validation: "strict"
    monitoring: "enabled"
  
  # Production environment
  production:
    enabled: true
    policies: "policies/production/"
    validation: "strict"
    monitoring: "enabled"
    approval: "required"

Policy Signing and Verification

# Sign policies with GPG
gpg --sign policies/security.yaml

# Verify policy signatures
gpg --verify policies/security.yaml.gpg

# Use signed policies only
dsp-scanner deploy --require-signatures policies/

# Verify policy integrity
dsp-scanner verify --checksum policies/

Policy Rollback

# Create policy backup
dsp-scanner backup --policies policies/ --output backup/

# Deploy with rollback capability
dsp-scanner deploy --rollback-enabled policies/

# Rollback to previous version
dsp-scanner rollback --version 1.0.0

# Verify rollback
dsp-scanner verify --policies policies/

Policy Monitoring

Policy Performance Monitoring

# Performance monitoring
monitoring:
  # Policy execution metrics
  metrics:
    - "policy_execution_time"
    - "policy_memory_usage"
    - "policy_cpu_usage"
    - "policy_throughput"
  
  # Alert thresholds
  alerts:
    execution_time: "5s"
    memory_usage: "512Mi"
    cpu_usage: "80%"
    error_rate: "5%"
  
  # Monitoring dashboard
  dashboard:
    url: "https://monitoring.company.com/dsp-scanner"
    refresh: "30s"

Policy Security Monitoring

# Security monitoring
security_monitoring:
  # Monitor for policy violations
  violations:
    enabled: true
    alert: true
    log: true
  
  # Monitor for policy bypass attempts
  bypass_attempts:
    enabled: true
    alert: true
    block: true
  
  # Monitor for policy tampering
  tampering:
    enabled: true
    checksum_verification: true
    signature_verification: true

Policy Audit Logging

# Audit logging
audit:
  # Policy execution logs
  execution:
    enabled: true
    level: "INFO"
    retention: "90d"
  
  # Policy change logs
  changes:
    enabled: true
    level: "INFO"
    retention: "1y"
  
  # Policy access logs
  access:
    enabled: true
    level: "INFO"
    retention: "90d"
  
  # Log format
  format: "json"
  encryption: true

Policy Maintenance

Policy Versioning

# Version control
versioning:
  # Semantic versioning
  format: "semver"
  major: "breaking changes"
  minor: "new features"
  patch: "bug fixes"
  
  # Version metadata
  metadata:
    author: "Security Team"
    date: "2024-01-15"
    description: "Security policy updates"
    changelog: "CHANGELOG.md"
  
  # Version compatibility
  compatibility:
    min_version: "1.0.0"
    max_version: "2.0.0"
    deprecated: []

Policy Updates

# Update policy safely
dsp-scanner update --policy security.yaml --dry-run

# Apply policy updates
dsp-scanner update --policy security.yaml --backup

# Verify policy updates
dsp-scanner verify --policy security.yaml

# Rollback if needed
dsp-scanner rollback --policy security.yaml

Policy Deprecation

# Deprecation process
deprecation:
  # Deprecation timeline
  timeline:
    announcement: "2024-01-01"
    deprecation: "2024-04-01"
    removal: "2024-07-01"
  
  # Migration path
  migration:
    old_policy: "security-v1.yaml"
    new_policy: "security-v2.yaml"
    migration_guide: "MIGRATION.md"
  
  # Notifications
  notifications:
    - "security@company.com"
    - "devops@company.com"

Security Best Practices

Policy Development

Do's ✅

• ✅ Use secure coding practices
• ✅ Validate all inputs
• ✅ Sanitize all outputs
• ✅ Use least privilege principle
• ✅ Implement defense in depth
• ✅ Follow security standards
• ✅ Document security decisions
• ✅ Test thoroughly
• ✅ Review regularly
• ✅ Update dependencies

Don'ts ❌

• ❌ Use hardcoded secrets
• ❌ Skip input validation
• ❌ Ignore security warnings
• ❌ Use deprecated features
• ❌ Skip testing
• ❌ Ignore compliance
• ❌ Use weak authentication
• ❌ Share sensitive data
• ❌ Skip documentation
• ❌ Ignore updates

Policy Deployment

Secure Deployment Checklist

• Validate policy syntax
• Test policy logic
• Check for vulnerabilities
• Verify signatures
• Backup existing policies
• Deploy to staging first
• Monitor deployment
• Verify functionality
• Update documentation
• Notify stakeholders

Policy Monitoring

Monitoring Checklist

• Enable performance monitoring
• Set up security alerts
• Configure audit logging
• Monitor policy violations
• Track policy changes
• Monitor resource usage
• Set up dashboards
• Configure notifications
• Regular health checks
• Incident response plan

Compliance Considerations

Regulatory Compliance

# Compliance frameworks
compliance:
  # SOC 2 Type II
  soc2:
    controls:
      - "CC6.1": "Logical and physical access controls"
      - "CC6.2": "System operations monitoring"
      - "CC6.3": "Change management process"
  
  # ISO 27001
  iso27001:
    controls:
      - "A.12.2.1": "Protection from malware"
      - "A.12.6.1": "Technical vulnerability management"
      - "A.13.2.1": "Agreements on network services"
  
  # NIST Cybersecurity Framework
  nist:
    functions:
      - "Identify": "Asset management"
      - "Protect": "Access control"
      - "Detect": "Anomaly detection"
      - "Respond": "Incident response"
      - "Recover": "Recovery planning"
  
  # PCI DSS
  pci:
    requirements:
      - "7.1": "Access control"
      - "7.2": "Privileged access"
      - "10.1": "Audit logging"

Policy Compliance Mapping

# Compliance mapping
package dsp_scanner.compliance

# Map policy to compliance controls
compliance_mapping[control] {
    # CIS Kubernetes Benchmark
    control := {
        "framework": "cis",
        "control": "5.2.1",
        "description": "Minimize the admission of privileged containers",
        "policy": "privileged-containers",
        "severity": "high"
    }
}

# Compliance reporting
compliance_report[report] {
    report := {
        "framework": "cis",
        "version": "1.8",
        "controls": [
            {
                "id": "5.2.1",
                "status": "compliant",
                "policy": "privileged-containers",
                "last_check": "2024-01-15"
            }
        ]
    }
}

Audit and Reporting

# Audit configuration
audit:
  # Compliance reporting
  reporting:
    frequency: "monthly"
    format: ["pdf", "json"]
    recipients: ["compliance@company.com"]
  
  # Evidence collection
  evidence:
    enabled: true
    retention: "7y"
    encryption: true
  
  # Compliance dashboard
  dashboard:
    url: "https://compliance.company.com/dsp-scanner"
    refresh: "daily"

Resources

Documentation

• Policy Development Guide
• Security Best Practices
• Configuration Security
• API Documentation

Tools

• Policy Validator
• Policy Linter
• Policy Tester

Support

• Security Contact
• Policy Issues
• Security Advisories