Nebula Mesh/Agent Security Audit: Key Mgmt, Tenant Isolation & TLS Hardening

Vulnerability Overview Issue Type: Security Audit — a comprehensive code review and attack surface assessment of and . Core Objectives: 1. Key Management: Recover the CA private key or the master key ( ). 2. Host Management Takeover: Read, modify, or revoke certificates or firewall rules. 3. Tenant Isolation: Obtain signed host certificates or read other tenants' keys. 4. Tenant Isolation Bypass: Escalate from a non-admin role to all operators (CAS and hosts). Scope of Impact Affected Components: (management API, UI, agent, enrolled, OIDC, CLI configuration), . Attack Surface: - Each package (auth, api, keystore, api, store, web, agent, enrolled, OIDC, CLI configuration). - Routes and middleware (auth, keys, api, store, web, agent, enrolled, OIDC, CLI configuration). - Resource handling (auth, keys, api, store, web, agent, enrolled, OIDC, CLI configuration). - Attack surface testing for the local instance: auth paths, token routes, OIDC authentication, certificate issuance, error handling. - Tooling baseline: go-vulncheck, gosec, golangci-lint, generative fuzzing (ADR 0009). Remediation Plan Confirmed Fixes: - Hardening: Enable TLS by default (unless or is explicitly specified). - Hardening: Enforce TLS to prevent username enumeration (#180). - Hardening: Zero out encrypted CA key material in the error path. - Hardening: Limit request body size + HTTP server timeouts (#105). - Hardening: Bound hostname and Groups length (#106). - Hardening: Gate (debuggers) + metrics and stop/readiness listener internal servers (#187). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routable addresses (#179). - Hardening: Reject plain HTTP on routa

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Nebula Mesh/Agent Security Audit: Key Mgmt, Tenant Isolation & TLS Hardening

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