wgtunnel: S3 Part 3 — FELHOM_WG sudoers + capabilities + config (DEFAULT OFF) + main wiring + escrow join

Sudoers: fixed-path conf install, enable/restart/disable, latest-handshakes-only wg read (dump FORBIDDEN — the S1 incident). 6 capability-manifest entries (Critical=false until S4 makes the tunnel load-bearing). WGTunnelConfig with enabled=false DEFAULT (the safety gate: a v0.64.0 rollout without explicit config is a no-op). Daemon wiring mirrors lanresolver + AddConsumer + SetWireguardReporter; --selftest=wgtunnel single-shot. IdentityBundle +wg_private_key (omitempty; pre-S3 blobs cannot be retrofitted — documented) with escrow-create auto-inject (field name only in logs). Red-proof (e) run. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PSK5g6qYLknKj8u3QAFEr6
2026-07-04 07:14:33 +02:00
parent fb248961c6
commit e2b6c63ea2
6 changed files with 230 additions and 9 deletions
@@ -0,0 +1,51 @@
+package escrow
+
+// S3 Group D — the WG-key escrow join. Red-proof (e): remove the auto-inject call and the
+// bundle-contains-key assertion fails.
+
+import (
+	"encoding/base64"
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestAttachWGKey(t *testing.T) {
+	dir := t.TempDir()
+	keyPath := filepath.Join(dir, "private.key")
+
+	// Missing key file → clean no-attach (pre-S3 bundles stay byte-compatible).
+	b := &IdentityBundle{TunnelToken: "tt", PBSToken: "pt"}
+	attached, err := AttachWGKey(b, keyPath)
+	if err != nil || attached {
+		t.Fatalf("missing file: attached=%v err=%v", attached, err)
+	}
+	raw, _ := json.Marshal(b)
+	if string(raw) != `{"tunnel_token":"tt","pbs_token":"pt"}` {
+		t.Fatalf("bundle without key marshals with extra fields: %s", raw)
+	}
+
+	// Present key file → attached, field carried.
+	key := base64.StdEncoding.EncodeToString(make([]byte, 32))
+	os.WriteFile(keyPath, []byte(key+"\n"), 0o600)
+	attached, err = AttachWGKey(b, keyPath)
+	if err != nil || !attached {
+		t.Fatalf("present file: attached=%v err=%v", attached, err)
+	}
+	if b.WGPrivateKey != key {
+		t.Fatalf("bundle key = %q", b.WGPrivateKey)
+	}
+	raw, _ = json.Marshal(b)
+	var back IdentityBundle
+	json.Unmarshal(raw, &back)
+	if back.WGPrivateKey != key {
+		t.Fatal("wg_private_key does not survive the bundle round-trip")
+	}
+
+	// Corrupt key file → error (the operator must know their escrow would lack the identity).
+	os.WriteFile(keyPath, []byte("garbage"), 0o600)
+	if _, err := AttachWGKey(&IdentityBundle{}, keyPath); err == nil {
+		t.Fatal("corrupt key file attached silently")
+	}
+}