| 1 | package tunnel |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "crypto/ed25519" |
| 6 | "crypto/rand" |
| 7 | "encoding/base64" |
| 8 | "io" |
| 9 | "net/http" |
| 10 | "net/http/httptest" |
| 11 | "net/url" |
| 12 | "path/filepath" |
| 13 | "strings" |
| 14 | "testing" |
| 15 | "time" |
| 16 | ) |
| 17 | |
| 18 | // An Eleven-shaped backend the door probe accepts. |
| 19 | func fakeInstance(t *testing.T) *httptest.Server { |
| 20 | t.Helper() |
| 21 | s := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { |
| 22 | if r.URL.Path == "/api/version" { |
| 23 | w.Header().Set("Content-Type", "application/json") |
| 24 | io.WriteString(w, `{"build":"test","version":"test-1"}`) |
| 25 | return |
| 26 | } |
| 27 | io.WriteString(w, "instance says hi") |
| 28 | })) |
| 29 | t.Cleanup(s.Close) |
| 30 | return s |
| 31 | } |
| 32 | |
| 33 | func relayGateway(t *testing.T) (*Gateway, *httptest.Server) { |
| 34 | t.Helper() |
| 35 | claims, err := OpenClaims(filepath.Join(t.TempDir(), "claims.db")) |
| 36 | if err != nil { |
| 37 | t.Fatal(err) |
| 38 | } |
| 39 | gw := &Gateway{Domain: "test.local", RelayDomain: "relay.local", ClaimsDB: claims, |
| 40 | DialTimeout: 5 * time.Second, RelayGrace: 200 * time.Millisecond} |
| 41 | srv := httptest.NewServer(gw) |
| 42 | t.Cleanup(srv.Close) |
| 43 | u, _ := url.Parse(srv.URL) |
| 44 | gw.ControlHost = u.Hostname() |
| 45 | return gw, srv |
| 46 | } |
| 47 | |
| 48 | // A relay claims a hostname, loses its connection, and gets the SAME |
| 49 | // hostname back on reconnect; meanwhile the sleeping hostname answers 503 |
| 50 | // instead of vanishing. |
| 51 | func TestRelayClaimReconnectAndGrace(t *testing.T) { |
| 52 | backend := fakeInstance(t) |
| 53 | gw, srv := relayGateway(t) |
| 54 | gw.RelayGrace = 10 * time.Second // long enough to observe sleeping |
| 55 | |
| 56 | _, priv, _ := ed25519.GenerateKey(rand.Reader) |
| 57 | run := func(ctx context.Context) (string, chan error) { |
| 58 | cl := &Client{Gateway: srv.URL, LocalAddr: strings.TrimPrefix(backend.URL, "http://"), Identity: priv} |
| 59 | ready := make(chan string, 1) |
| 60 | done := make(chan error, 1) |
| 61 | go func() { done <- cl.Run(ctx, func(h string) { ready <- h }) }() |
| 62 | select { |
| 63 | case h := <-ready: |
| 64 | return h, done |
| 65 | case err := <-done: |
| 66 | t.Fatalf("client exited early: %v", err) |
| 67 | case <-time.After(5 * time.Second): |
| 68 | t.Fatal("no ready") |
| 69 | } |
| 70 | return "", done |
| 71 | } |
| 72 | |
| 73 | ctx1, cancel1 := context.WithCancel(context.Background()) |
| 74 | host1, _ := run(ctx1) |
| 75 | if !strings.HasPrefix(host1, "r-") || !strings.HasSuffix(host1, ".relay.local") { |
| 76 | t.Fatalf("unexpected relay host %q", host1) |
| 77 | } |
| 78 | |
| 79 | // Drop the connection: the hostname sleeps (503) rather than vanishing. |
| 80 | cancel1() |
| 81 | deadline := time.Now().Add(3 * time.Second) |
| 82 | for { |
| 83 | gw.mu.Lock() |
| 84 | tun := gw.tunnels[host1] |
| 85 | sleeping := tun != nil && tun.sleeping |
| 86 | gw.mu.Unlock() |
| 87 | if sleeping { |
| 88 | break |
| 89 | } |
| 90 | if time.Now().After(deadline) { |
| 91 | t.Fatal("tunnel never went to sleep") |
| 92 | } |
| 93 | time.Sleep(20 * time.Millisecond) |
| 94 | } |
| 95 | rt := http.DefaultTransport.(*http.Transport).Clone() |
| 96 | httpc := &http.Client{Transport: roundTripperFunc(func(r *http.Request) (*http.Response, error) { |
| 97 | r.Host = host1 |
| 98 | return rt.RoundTrip(r) |
| 99 | })} |
| 100 | resp, err := httpc.Get(srv.URL + "/") |
| 101 | if err != nil { |
| 102 | t.Fatal(err) |
| 103 | } |
| 104 | resp.Body.Close() |
| 105 | if resp.StatusCode != http.StatusServiceUnavailable { |
| 106 | t.Fatalf("sleeping relay answered %d, want 503", resp.StatusCode) |
| 107 | } |
| 108 | |
| 109 | // Reconnect with the same identity: same hostname, traffic flows again. |
| 110 | ctx2, cancel2 := context.WithCancel(context.Background()) |
| 111 | defer cancel2() |
| 112 | host2, _ := run(ctx2) |
| 113 | if host2 != host1 { |
| 114 | t.Fatalf("reconnect got %q, want the claimed %q", host2, host1) |
| 115 | } |
| 116 | resp, err = httpc.Get(srv.URL + "/") |
| 117 | if err != nil { |
| 118 | t.Fatal(err) |
| 119 | } |
| 120 | body, _ := io.ReadAll(resp.Body) |
| 121 | resp.Body.Close() |
| 122 | if string(body) != "instance says hi" { |
| 123 | t.Fatalf("after reattach body = %q", body) |
| 124 | } |
| 125 | |
| 126 | // A different identity gets a different hostname. |
| 127 | _, priv2, _ := ed25519.GenerateKey(rand.Reader) |
| 128 | cl2 := &Client{Gateway: srv.URL, LocalAddr: strings.TrimPrefix(backend.URL, "http://"), Identity: priv2} |
| 129 | ready2 := make(chan string, 1) |
| 130 | ctx3, cancel3 := context.WithCancel(context.Background()) |
| 131 | defer cancel3() |
| 132 | go cl2.Run(ctx3, func(h string) { ready2 <- h }) |
| 133 | select { |
| 134 | case h := <-ready2: |
| 135 | if h == host1 { |
| 136 | t.Fatal("second identity was handed the first identity's hostname") |
| 137 | } |
| 138 | case <-time.After(5 * time.Second): |
| 139 | t.Fatal("second identity never became ready") |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | // After the grace window expires, the hostname is fully retired (route |
| 144 | // withdrawn) — but the claim survives, so the next connect gets it back. |
| 145 | func TestRelayGraceExpiry(t *testing.T) { |
| 146 | backend := fakeInstance(t) |
| 147 | gw, srv := relayGateway(t) // grace 200ms |
| 148 | closed := make(chan string, 1) |
| 149 | gw.OnClose = func(h string) { closed <- h } |
| 150 | |
| 151 | _, priv, _ := ed25519.GenerateKey(rand.Reader) |
| 152 | cl := &Client{Gateway: srv.URL, LocalAddr: strings.TrimPrefix(backend.URL, "http://"), Identity: priv} |
| 153 | ready := make(chan string, 1) |
| 154 | ctx, cancel := context.WithCancel(context.Background()) |
| 155 | go cl.Run(ctx, func(h string) { ready <- h }) |
| 156 | var host string |
| 157 | select { |
| 158 | case host = <-ready: |
| 159 | case <-time.After(5 * time.Second): |
| 160 | t.Fatal("no ready") |
| 161 | } |
| 162 | cancel() |
| 163 | select { |
| 164 | case got := <-closed: |
| 165 | if got != host { |
| 166 | t.Fatalf("OnClose got %q", got) |
| 167 | } |
| 168 | case <-time.After(5 * time.Second): |
| 169 | t.Fatal("grace never expired") |
| 170 | } |
| 171 | if owner, _ := gw.ClaimsDB.Owner(host); owner == "" { |
| 172 | t.Fatal("claim was lost with the grace expiry") |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | // A gateway without relay support refuses relay hellos with a clear message. |
| 177 | func TestRelayRefusedWithoutDomain(t *testing.T) { |
| 178 | backend := fakeInstance(t) |
| 179 | gw := &Gateway{Domain: "test.local"} |
| 180 | srv := httptest.NewServer(gw) |
| 181 | defer srv.Close() |
| 182 | u, _ := url.Parse(srv.URL) |
| 183 | gw.ControlHost = u.Hostname() |
| 184 | |
| 185 | _, priv, _ := ed25519.GenerateKey(rand.Reader) |
| 186 | cl := &Client{Gateway: srv.URL, LocalAddr: strings.TrimPrefix(backend.URL, "http://"), Identity: priv} |
| 187 | err := cl.Run(context.Background(), func(string) {}) |
| 188 | if err == nil || !strings.Contains(err.Error(), "doesn't offer relay") { |
| 189 | t.Fatalf("expected relay refusal, got %v", err) |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | func TestVerifyClaimSig(t *testing.T) { |
| 194 | pub, priv, _ := ed25519.GenerateKey(rand.Reader) |
| 195 | pk := base64.RawURLEncoding.EncodeToString(pub) |
| 196 | sig := base64.RawURLEncoding.EncodeToString(ed25519.Sign(priv, []byte("nonce-1"))) |
| 197 | if err := VerifyClaimSig(pk, "nonce-1", sig); err != nil { |
| 198 | t.Fatalf("valid sig rejected: %v", err) |
| 199 | } |
| 200 | if err := VerifyClaimSig(pk, "nonce-2", sig); err == nil { |
| 201 | t.Fatal("replayed sig accepted for a different nonce") |
| 202 | } |
| 203 | if err := VerifyClaimSig("not-a-key", "nonce-1", sig); err == nil { |
| 204 | t.Fatal("garbage key accepted") |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | func TestSweepIdleFreesOnlyAbandonedClaims(t *testing.T) { |
| 209 | claims, err := OpenClaims(filepath.Join(t.TempDir(), "claims.db")) |
| 210 | if err != nil { |
| 211 | t.Fatal(err) |
| 212 | } |
| 213 | for _, h := range []string{"r-old.relay.local", "r-live.relay.local", "r-fresh.relay.local"} { |
| 214 | if err := claims.Claim(h, "pk-"+h); err != nil { |
| 215 | t.Fatal(err) |
| 216 | } |
| 217 | } |
| 218 | // Backdate two claims past the idle cutoff; r-live stays connected. |
| 219 | old := time.Now().Add(-72 * time.Hour).Unix() |
| 220 | for _, h := range []string{"r-old.relay.local", "r-live.relay.local"} { |
| 221 | if _, err := claims.sql.Exec(`UPDATE relay_claims SET last_seen = ? WHERE host = ?`, old, h); err != nil { |
| 222 | t.Fatal(err) |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | freed, err := claims.SweepIdle(24*time.Hour, map[string]bool{"r-live.relay.local": true}) |
| 227 | if err != nil { |
| 228 | t.Fatal(err) |
| 229 | } |
| 230 | if len(freed) != 1 || freed[0] != "r-old.relay.local" { |
| 231 | t.Fatalf("expected only r-old freed, got %v", freed) |
| 232 | } |
| 233 | if h, _ := claims.HostFor("pk-r-live.relay.local"); h != "r-live.relay.local" { |
| 234 | t.Fatal("connected claim was swept despite being in keep") |
| 235 | } |
| 236 | if h, _ := claims.HostFor("pk-r-fresh.relay.local"); h != "r-fresh.relay.local" { |
| 237 | t.Fatal("fresh claim was swept") |
| 238 | } |
| 239 | if h, _ := claims.HostFor("pk-r-old.relay.local"); h != "" { |
| 240 | t.Fatal("idle claim survived the sweep") |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | func TestDeleteByHostReturnsHostnameToPool(t *testing.T) { |
| 245 | claims, err := OpenClaims(filepath.Join(t.TempDir(), "claims.db")) |
| 246 | if err != nil { |
| 247 | t.Fatal(err) |
| 248 | } |
| 249 | if err := claims.Claim("r-gone.relay.local", "pk-1"); err != nil { |
| 250 | t.Fatal(err) |
| 251 | } |
| 252 | if err := claims.DeleteByHost("r-gone.relay.local"); err != nil { |
| 253 | t.Fatal(err) |
| 254 | } |
| 255 | if h, _ := claims.HostFor("pk-1"); h != "" { |
| 256 | t.Fatal("deleted claim still resolves for its old keypair") |
| 257 | } |
| 258 | // The hostname and the keypair are both free again — either can re-claim. |
| 259 | if err := claims.Claim("r-gone.relay.local", "pk-2"); err != nil { |
| 260 | t.Fatalf("freed hostname couldn't be re-claimed: %v", err) |
| 261 | } |
| 262 | if err := claims.Claim("r-new.relay.local", "pk-1"); err != nil { |
| 263 | t.Fatalf("freed keypair couldn't claim a new hostname: %v", err) |
| 264 | } |
| 265 | } |
| 266 | |
amadan