Fast and extensible multi-platform HTTP/1-2-3 web server with automatic HTTPS
Mirrored from https://github.com/Slazee/caddy.git
Synced Nov 11, 01:00 UTC
| 1 | package integration |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "crypto/tls" |
| 6 | "errors" |
| 7 | "fmt" |
| 8 | "io" |
| 9 | "net" |
| 10 | "net/http" |
| 11 | "strings" |
| 12 | "testing" |
| 13 | "time" |
| 14 | |
| 15 | "golang.org/x/net/http2" |
| 16 | "golang.org/x/net/http2/hpack" |
| 17 | |
| 18 | "github.com/caddyserver/caddy/v2/caddytest" |
| 19 | ) |
| 20 | |
| 21 | var errExtendedConnectUnsupportedByPeer = errors.New("peer did not advertise RFC 8441 extended CONNECT support") |
| 22 | |
| 23 | func TestReverseProxyExtendedConnectOverH2(t *testing.T) { |
| 24 | tester := caddytest.NewTester(t) |
| 25 | backend := newWebsocketUpgradeEchoBackend(t) |
| 26 | defer backend.Close() |
| 27 | |
| 28 | tester.InitServer(fmt.Sprintf(` |
| 29 | { |
| 30 | admin localhost:2999 |
| 31 | http_port 9080 |
| 32 | https_port 9443 |
| 33 | grace_period 1ns |
| 34 | skip_install_trust |
| 35 | servers :9443 { |
| 36 | protocols h2 |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | https://localhost:9443 { |
| 41 | reverse_proxy %s |
| 42 | } |
| 43 | `, backend.addr), "caddyfile") |
| 44 | |
| 45 | const payload = "extended-connect-echo\n" |
| 46 | if err := assertExtendedConnectH2Echo("localhost:9443", payload); err != nil { |
| 47 | if errors.Is(err, errExtendedConnectUnsupportedByPeer) { |
| 48 | t.Skipf("skipping extended CONNECT integration test: %v", err) |
| 49 | } |
| 50 | t.Fatalf("extended connect h2 echo failed: %v", err) |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | func assertExtendedConnectH2Echo(addr, payload string) error { |
| 55 | conn, err := tlsDialH2(addr) |
| 56 | if err != nil { |
| 57 | return fmt.Errorf("dialing h2 tls: %w", err) |
| 58 | } |
| 59 | defer conn.Close() |
| 60 | |
| 61 | if err := conn.SetDeadline(time.Now().Add(5 * time.Second)); err != nil { |
| 62 | return fmt.Errorf("setting deadline: %w", err) |
| 63 | } |
| 64 | |
| 65 | fr := http2.NewFramer(conn, conn) |
| 66 | |
| 67 | if _, err := conn.Write([]byte(http2.ClientPreface)); err != nil { |
| 68 | return fmt.Errorf("writing client preface: %w", err) |
| 69 | } |
| 70 | if err := fr.WriteSettings(http2.Setting{ID: http2.SettingEnableConnectProtocol, Val: 1}); err != nil { |
| 71 | return fmt.Errorf("writing client settings: %w", err) |
| 72 | } |
| 73 | |
| 74 | supported, err := waitForServerSettings(fr) |
| 75 | if err != nil { |
| 76 | return err |
| 77 | } |
| 78 | if !supported { |
| 79 | return errExtendedConnectUnsupportedByPeer |
| 80 | } |
| 81 | if err := waitForSettingsAck(fr); err != nil { |
| 82 | return err |
| 83 | } |
| 84 | |
| 85 | if err := writeExtendedConnectHeaders(fr, addr); err != nil { |
| 86 | return err |
| 87 | } |
| 88 | |
| 89 | status, err := readResponseStatus(fr, 1) |
| 90 | if err != nil { |
| 91 | return err |
| 92 | } |
| 93 | if status != "200" { |
| 94 | return fmt.Errorf("unexpected extended connect status: got=%s want=200", status) |
| 95 | } |
| 96 | |
| 97 | if err := fr.WriteData(1, false, []byte(payload)); err != nil { |
| 98 | return fmt.Errorf("writing stream data: %w", err) |
| 99 | } |
| 100 | |
| 101 | echo, err := readStreamData(fr, 1, len(payload)) |
| 102 | if err != nil { |
| 103 | return err |
| 104 | } |
| 105 | if echo != payload { |
| 106 | return fmt.Errorf("unexpected echoed payload: got=%q want=%q", echo, payload) |
| 107 | } |
| 108 | |
| 109 | _ = fr.WriteRSTStream(1, http2.ErrCodeNo) |
| 110 | return nil |
| 111 | } |
| 112 | |
| 113 | func tlsDialH2(addr string) (net.Conn, error) { |
| 114 | var lastErr error |
| 115 | for i := 0; i < 30; i++ { |
| 116 | dialer := &net.Dialer{Timeout: 2 * time.Second} |
| 117 | conn, err := tls.DialWithDialer(dialer, "tcp", addr, &tls.Config{ |
| 118 | ServerName: "localhost", |
| 119 | InsecureSkipVerify: true, |
| 120 | NextProtos: []string{"h2"}, |
| 121 | }) |
| 122 | if err == nil { |
| 123 | return conn, nil |
| 124 | } |
| 125 | lastErr = err |
| 126 | time.Sleep(100 * time.Millisecond) |
| 127 | } |
| 128 | return nil, lastErr |
| 129 | } |
| 130 | |
| 131 | func waitForServerSettings(fr *http2.Framer) (bool, error) { |
| 132 | for { |
| 133 | frame, err := fr.ReadFrame() |
| 134 | if err != nil { |
| 135 | return false, fmt.Errorf("reading frame before connect: %w", err) |
| 136 | } |
| 137 | settings, ok := frame.(*http2.SettingsFrame) |
| 138 | if !ok { |
| 139 | continue |
| 140 | } |
| 141 | if settings.IsAck() { |
| 142 | continue |
| 143 | } |
| 144 | |
| 145 | supported := false |
| 146 | if err := settings.ForeachSetting(func(s http2.Setting) error { |
| 147 | if s.ID == http2.SettingEnableConnectProtocol && s.Val == 1 { |
| 148 | supported = true |
| 149 | } |
| 150 | return nil |
| 151 | }); err != nil { |
| 152 | return false, fmt.Errorf("reading server settings: %w", err) |
| 153 | } |
| 154 | |
| 155 | if err := fr.WriteSettingsAck(); err != nil { |
| 156 | return false, fmt.Errorf("writing settings ack: %w", err) |
| 157 | } |
| 158 | return supported, nil |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | func waitForSettingsAck(fr *http2.Framer) error { |
| 163 | for { |
| 164 | frame, err := fr.ReadFrame() |
| 165 | if err != nil { |
| 166 | return fmt.Errorf("reading settings ack: %w", err) |
| 167 | } |
| 168 | settings, ok := frame.(*http2.SettingsFrame) |
| 169 | if ok && settings.IsAck() { |
| 170 | return nil |
| 171 | } |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | func writeExtendedConnectHeaders(fr *http2.Framer, addr string) error { |
| 176 | var hb bytes.Buffer |
| 177 | enc := hpack.NewEncoder(&hb) |
| 178 | for _, hf := range []hpack.HeaderField{ |
| 179 | {Name: ":method", Value: "CONNECT"}, |
| 180 | {Name: ":scheme", Value: "https"}, |
| 181 | {Name: ":authority", Value: addr}, |
| 182 | {Name: ":path", Value: "/upgrade"}, |
| 183 | {Name: ":protocol", Value: "websocket"}, |
| 184 | } { |
| 185 | if err := enc.WriteField(hf); err != nil { |
| 186 | return fmt.Errorf("encoding request headers: %w", err) |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | if err := fr.WriteHeaders(http2.HeadersFrameParam{ |
| 191 | StreamID: 1, |
| 192 | BlockFragment: hb.Bytes(), |
| 193 | EndHeaders: true, |
| 194 | EndStream: false, |
| 195 | }); err != nil { |
| 196 | return fmt.Errorf("writing extended connect headers: %w", err) |
| 197 | } |
| 198 | return nil |
| 199 | } |
| 200 | |
| 201 | func readResponseStatus(fr *http2.Framer, streamID uint32) (string, error) { |
| 202 | var block bytes.Buffer |
| 203 | |
| 204 | for { |
| 205 | frame, err := fr.ReadFrame() |
| 206 | if err != nil { |
| 207 | return "", fmt.Errorf("reading response headers: %w", err) |
| 208 | } |
| 209 | if rst, ok := frame.(*http2.RSTStreamFrame); ok && rst.StreamID == streamID { |
| 210 | return "", fmt.Errorf("stream reset before response headers: %s", rst.ErrCode) |
| 211 | } |
| 212 | |
| 213 | h, ok := frame.(*http2.HeadersFrame) |
| 214 | if !ok || h.StreamID != streamID { |
| 215 | continue |
| 216 | } |
| 217 | |
| 218 | if _, err := block.Write(h.HeaderBlockFragment()); err != nil { |
| 219 | return "", fmt.Errorf("buffering response header fragment: %w", err) |
| 220 | } |
| 221 | for !h.HeadersEnded() { |
| 222 | next, err := fr.ReadFrame() |
| 223 | if err != nil { |
| 224 | return "", fmt.Errorf("reading continuation frame: %w", err) |
| 225 | } |
| 226 | c, ok := next.(*http2.ContinuationFrame) |
| 227 | if !ok || c.StreamID != streamID { |
| 228 | continue |
| 229 | } |
| 230 | if _, err := block.Write(c.HeaderBlockFragment()); err != nil { |
| 231 | return "", fmt.Errorf("buffering continuation fragment: %w", err) |
| 232 | } |
| 233 | if c.HeadersEnded() { |
| 234 | break |
| 235 | } |
| 236 | } |
| 237 | break |
| 238 | } |
| 239 | |
| 240 | var status string |
| 241 | dec := hpack.NewDecoder(4096, func(f hpack.HeaderField) { |
| 242 | if f.Name == ":status" { |
| 243 | status = f.Value |
| 244 | } |
| 245 | }) |
| 246 | if _, err := dec.Write(block.Bytes()); err != nil { |
| 247 | return "", fmt.Errorf("decoding response header block: %w", err) |
| 248 | } |
| 249 | if status == "" { |
| 250 | return "", fmt.Errorf("missing :status in response headers") |
| 251 | } |
| 252 | return status, nil |
| 253 | } |
| 254 | |
| 255 | func readStreamData(fr *http2.Framer, streamID uint32, n int) (string, error) { |
| 256 | buf := make([]byte, 0, n) |
| 257 | for len(buf) < n { |
| 258 | frame, err := fr.ReadFrame() |
| 259 | if err != nil { |
| 260 | return "", fmt.Errorf("reading stream data: %w", err) |
| 261 | } |
| 262 | d, ok := frame.(*http2.DataFrame) |
| 263 | if !ok || d.StreamID != streamID { |
| 264 | continue |
| 265 | } |
| 266 | buf = append(buf, d.Data()...) |
| 267 | } |
| 268 | return string(buf[:n]), nil |
| 269 | } |
| 270 | |
| 271 | type websocketUpgradeEchoBackend struct { |
| 272 | addr string |
| 273 | ln net.Listener |
| 274 | server *http.Server |
| 275 | } |
| 276 | |
| 277 | func newWebsocketUpgradeEchoBackend(t *testing.T) *websocketUpgradeEchoBackend { |
| 278 | t.Helper() |
| 279 | |
| 280 | backend := &websocketUpgradeEchoBackend{} |
| 281 | backend.server = &http.Server{ |
| 282 | Handler: http.HandlerFunc(backend.serveHTTP), |
| 283 | } |
| 284 | |
| 285 | ln, err := net.Listen("tcp", "127.0.0.1:0") |
| 286 | if err != nil { |
| 287 | t.Fatalf("listening for websocket backend: %v", err) |
| 288 | } |
| 289 | backend.ln = ln |
| 290 | backend.addr = ln.Addr().String() |
| 291 | |
| 292 | go func() { |
| 293 | _ = backend.server.Serve(ln) |
| 294 | }() |
| 295 | |
| 296 | return backend |
| 297 | } |
| 298 | |
| 299 | func (b *websocketUpgradeEchoBackend) serveHTTP(w http.ResponseWriter, r *http.Request) { |
| 300 | if !strings.EqualFold(r.Header.Get("Connection"), "Upgrade") || !strings.EqualFold(r.Header.Get("Upgrade"), "websocket") { |
| 301 | http.Error(w, "upgrade required", http.StatusUpgradeRequired) |
| 302 | return |
| 303 | } |
| 304 | |
| 305 | hijacker, ok := w.(http.Hijacker) |
| 306 | if !ok { |
| 307 | http.Error(w, "hijacking not supported", http.StatusInternalServerError) |
| 308 | return |
| 309 | } |
| 310 | |
| 311 | conn, rw, err := hijacker.Hijack() |
| 312 | if err != nil { |
| 313 | return |
| 314 | } |
| 315 | |
| 316 | _, _ = rw.WriteString("HTTP/1.1 101 Switching Protocols\r\nConnection: Upgrade\r\nUpgrade: websocket\r\n\r\n") |
| 317 | _ = rw.Flush() |
| 318 | |
| 319 | go func() { |
| 320 | defer conn.Close() |
| 321 | _, _ = io.Copy(conn, conn) |
| 322 | }() |
| 323 | } |
| 324 | |
| 325 | func (b *websocketUpgradeEchoBackend) Close() { |
| 326 | _ = b.server.Close() |
| 327 | _ = b.ln.Close() |
| 328 | } |