A token can be issued for a machine's tunnel key, and it joins through the tunnel

token issue --overlay-key records the key the machine made, binds the
token to it, gives the machine its address and makes it a peer of the
hub, pushing the hub before the token is shown. The token carries the
hub's tunnel and the bus at its address on the private network, and
enrolment refuses any other key (novox/hq ADR 0169). Tokens without a
key enrol as before until the bus is closed. Also a token verb.

internal/link/enrol_tunnel_key_test.go

@@ -0,0 +1,37 @@
+package link_test
+
+import (
+	"context"
+	"strings"
+	"testing"
+
+	"github.com/novox/mesh-controller/internal/link"
+)
+
+// **A token issued for a tunnel key takes that key and no other** (novox/hq ADR 0169). The hub was
+// sent the key before the token was shown, so another key is a machine it does not know.
+func TestATokenIssuedForATunnelKeyTakesThatKeyAndNoOther(t *testing.T) {
+	inv, ident := aMeshReadyToEnrol(t)
+	ctx := context.Background()
+	secret, public := aTokenFor(t, inv, "joiner")
+	node, err := inv.NodeByName(ctx, "joiner")
+	if err != nil {
+		t.Fatal(err)
+	}
+	const issuedFor = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA="
+	if err := inv.BindTokenToKey(ctx, node.ID, issuedFor); err != nil {
+		t.Fatal(err)
+	}
+	e := link.Enrolment{Inventory: inv, Identity: ident}
+
+	_, err = e.Enrol(ctx, link.EnrolRequest{Node: "joiner", Secret: secret, PublicKey: public,
+		OverlayKey: "BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB="})
+	if err == nil || !strings.Contains(err.Error(), "issued for the tunnel key") {
+		t.Fatalf("a token issued for one key took another: %v", err)
+	}
+
+	if _, err := e.Enrol(ctx, link.EnrolRequest{Node: "joiner", Secret: secret, PublicKey: public,
+		OverlayKey: issuedFor}); err != nil {
+		t.Fatalf("the key the token was issued for was refused: %v", err)
+	}
+}