mesh-security

What this skill does

# Service Mesh Security Analyzer

Comprehensive security analysis for Istio, Consul, and Linkerd service mesh configurations with NIST 800-53 Rev 5 control mappings.

## Quick Start

### Analyze a Configuration File

```bash
# Run the analyzer wrapper directly
node ~/.codex/skills/mesh-security/lib/analyzer-wrapper.js <config-file>

# Examples
node ~/.codex/skills/mesh-security/lib/analyzer-wrapper.js ./istio-meshconfig.yaml
node ~/.codex/skills/mesh-security/lib/analyzer-wrapper.js ./consul-config.json
node ~/.codex/skills/mesh-security/lib/analyzer-wrapper.js ./linkerd-config.yaml --json
```

### Sample Configurations

Test configs are available in the `samples/` directory:
- Istio: `samples/sample-meshconfig.yaml`
- Consul: `samples/sample-consul-config.json`
- Linkerd: `samples/sample-linkerd-config.yaml`

## Supported Mesh Types

### Istio

**Auto-detection:** Files with `kind: MeshConfig` and `apiVersion` containing `istio.io`

**Security Checks:**
| Category | What It Checks |
|----------|----------------|
| mTLS | Enabled status, STRICT mode enforcement |
| Certificates | CA provider, validity duration (optimal 90 days) |
| Peer Authentication | Default peer auth, STRICT mode |
| Proxy Config | Privileged mode, image versioning, holdApplicationUntilProxyStarts |
| Secret Discovery | SDS enabled for certificate management |
| Trust Domain | Explicitly configured, not using default |
| Authorization | Default deny policies |
| Telemetry | Enabled collection, access logging |
| RBAC | Role-based access control enforcement |
| Traffic Policy | Outbound traffic restricted to REGISTRY_ONLY |

### Consul

**Auto-detection:** Files with `mesh_type: "consul"` or containing `connect`, `tls`, and `acl` fields

**Security Checks:**
| Category | What It Checks |
|----------|----------------|
| Service Mesh | Connect enabled |
| Proxy Security | No privileged mode |
| TLS Security | verify_incoming, verify_outgoing, hostname verification |
| Access Control | ACL enabled, default deny policy, agent tokens |
| Telemetry | Service metrics enabled |
| Auto-Encryption | TLS auto-encrypt feature |
| Gossip Encryption | Key configured, proper length, verification |
| FedRAMP Compliance | TLS 1.2+, FIPS ciphers, strong encryption |

### Linkerd

**Auto-detection:** Files with `mesh_type: "linkerd"` or containing `identity`, `proxy`, and `policy` fields

**Security Checks:**
| Category | What It Checks |
|----------|----------------|
| TLS Security | Enabled, enforced, cipher suites, min version 1.2 |
| Service Identity | Enabled, certificate issuer, validity period |
| Proxy Config | Non-privileged, versioning, timeouts, resource limits |
| Authorization | Policy enforcement, default deny, specific rules |
| Authentication | Strict mode enforcement |
| Observability | Tracing enabled, sampling, collector config |
| Metrics | Enabled, Prometheus integration, retention |
| Traffic Rules | TLS in destination rules, system namespace protection |

## Severity Levels

| Level | Meaning | Example Issues |
|-------|---------|----------------|
| **Critical** | Immediate security risk | RBAC/ACL disabled, mTLS not enforced, gossip encryption missing |
| **High** | Significant vulnerability | Permissive auth modes, privileged containers, missing hostname verification |
| **Medium** | Security weakness | Default trust domains, long certificate validity, missing telemetry |
| **Low** | Best practice violation | Non-pinned images, missing timeouts, default CA providers |

## NIST 800-53 Control Mappings

Findings are mapped to these NIST 800-53 Rev 5 controls:

| Control | Title | Relevant Checks |
|---------|-------|-----------------|
| AC-3 | Access Enforcement | RBAC, ACL, Authorization policies |
| AC-4 | Information Flow Enforcement | Outbound traffic policy, Policy enforcement |
| AC-17 | Remote Access | mTLS, TLS configuration |
| AU-2 | Audit Events | Telemetry, Access logging |
| AU-3 | Content of Audit Records | Logging configuration |
| AU-12 | Audit Generation | Metrics, Tracing |
| CA-3 | System Interconnections | Trust domain, Peer authentication |
| CM-2 | Baseline Configuration | Proxy config, Default settings |
| CM-6 | Configuration Settings | Security hardening |
| CM-7 | Least Functionality | Privileged mode, Outbound restrictions |
| IA-2 | Identification and Authentication | Service identity, Authentication |
| IA-5 | Authenticator Management | Certificate management, SDS |
| SC-7 | Boundary Protection | Traffic policy, Network segmentation |
| SC-8 | Transmission Confidentiality | mTLS, TLS settings |
| SC-12 | Cryptographic Key Management | Certificate validity, CA settings |
| SC-13 | Cryptographic Protection | Cipher suites, TLS versions |
| SC-23 | Session Authenticity | Peer authentication, Trust chain |
| SI-4 | System Monitoring | Telemetry, Metrics, Tracing |

## Workflow: Analyze a Mesh Configuration

1. **Read the configuration file** to understand its structure
2. **Run the analyzer** using the wrapper script
3. **Review findings** by severity (Critical first)
4. **Check NIST mappings** for compliance requirements
5. **Generate remediation** recommendations if needed

### Example Analysis Session

```
User: Analyze my Istio mesh configuration at ./istio-config.yaml

Steps:
1. Read the file to understand the mesh configuration
2. Run: node ~/.codex/skills/mesh-security/lib/analyzer-wrapper.js ./istio-config.yaml
3. Present findings grouped by severity
4. Highlight critical/high severity issues first
5. Include NIST control mappings for compliance context
6. Offer to generate fixes or compliance report
```

## Output Format

### Markdown (Default)

```markdown
## Security Analysis Results

**Mesh Type:** Istio
**File:** ./istio-config.yaml
**Total Findings:** 5

| Severity | Count |
|----------|-------|
| Critical | 1     |
| High     | 2     |
| Medium   | 2     |
| Low      | 0     |

### Critical Findings

#### 1. mTLS Configuration
**Issue:** mTLS is not set to STRICT mode
**Location:** `spec.mtls.mode`
**Recommendation:** Set mTLS mode to STRICT to enforce mutual TLS
**NIST Controls:** SC-8, SC-13
```

### JSON (--json flag)

```json
{
  "success": true,
  "meshType": "istio",
  "findings": [...],
  "summary": { "critical": 1, "high": 2, "medium": 2, "low": 0, "total": 5 }
}
```

## Related Skills

- **mesh-remediation** - Generate and apply security fixes
- **mesh-compliance-reporter** - Generate FedRAMP/NIST compliance reports

## Programmatic Usage

```javascript
const { analyzeConfig, formatFindings } = require('~/.codex/skills/mesh-security/lib/analyzer-wrapper.js');

// Analyze a config file
const results = analyzeConfig('./istio-config.yaml');
console.log(formatFindings(results));

// Or specify mesh type explicitly
const consulResults = analyzeConfig('./config.json', 'consul');
```