Introduce ConnTracker (atomic.Bool + WaitGroup) to track in-flight proxy
connections per sandbox. Before pausing a VM, the manager drains active
connections with a 2s grace period, preventing Go runtime corruption
inside the guest caused by stale TCP state surviving Firecracker
snapshot/restore.
Also add:
- AcquireProxyConn on Manager for atomic lookup + connection tracking
- Proxy cache (120s TTL) on CP SandboxProxyWrapper with single-query
DB lookup (GetSandboxProxyTarget) to avoid two round-trips
- Reset() on ConnTracker to re-enable connections if pause fails
- Internal ECDSA P-256 CA (WRENN_CA_CERT/WRENN_CA_KEY env vars); when absent
the system falls back to plain HTTP so dev mode works without certificates
- Host leaf cert (7-day TTL, IP SAN) issued at registration and renewed on
every JWT refresh; fingerprint + expiry stored in DB (cert_expires_at column
replaces the removed mtls_enabled flag)
- CP ephemeral client cert (24-hour TTL) via CPCertStore with atomic hot-swap;
background goroutine renews it every 12 hours without restarting the server
- Host agent uses tls.Listen + httpServer.Serve so GetCertificate callback is
respected (ListenAndServeTLS always reads cert from disk)
- Sandbox reverse proxy now uses pool.Transport() so it shares the same TLS
config as the Connect RPC clients instead of http.DefaultTransport
- Credentials file renamed host-credentials.json with cert_pem/key_pem/
ca_cert_pem fields; duplicate register/refresh response structs collapsed
to authResponse
- Change sandbox ID prefix from sb- to cl- (capsule) throughout
- Fix proxy URL regex character class: base36 uses 0-9a-z, not just hex
- Add MMDS V2 config and metadata to VM boot flow so envd can read
WRENN_SANDBOX_ID and WRENN_TEMPLATE_ID from inside the guest
- Pass TemplateID through VMConfig into both fresh and snapshot boot paths
Consolidate 16 migrations into one with UUID columns for all entity
IDs. TEXT is kept only for polymorphic fields (audit_logs.actor_id,
resource_id) and template names. The id package now generates UUIDs
via google/uuid, with Format*/Parse* helpers for the prefixed wire
format (sb-{uuid}, usr-{uuid}, etc.). Auth context, services, and
handlers pass pgtype.UUID internally; conversion to/from prefixed
strings happens at API and RPC boundaries. Adds PlatformTeamID
(all-zeros UUID) for shared resources.
Add SandboxProxyWrapper that intercepts requests with Host headers
matching {port}-{sandbox_id}.{domain} and proxies them through the
owning host agent's /proxy endpoint.
Authentication is via X-API-Key only (no JWT). The API key's team must
own the sandbox. Export EnsureScheme from lifecycle package for reuse.
Request flow: SDK -> Caddy -> CP catch-all -> Host Agent -> sandbox VM.
This is an intermediate state — needs further work for the full code
interpreter feature.
