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 | // Copyright 2015 Matthew Holt and The Caddy Authors |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | package reverseproxy |
| 16 | |
| 17 | import ( |
| 18 | "context" |
| 19 | "crypto/tls" |
| 20 | "crypto/x509" |
| 21 | "encoding/base64" |
| 22 | "encoding/json" |
| 23 | "fmt" |
| 24 | weakrand "math/rand/v2" |
| 25 | "net" |
| 26 | "net/http" |
| 27 | "net/url" |
| 28 | "os" |
| 29 | "reflect" |
| 30 | "slices" |
| 31 | "strings" |
| 32 | "time" |
| 33 | |
| 34 | "github.com/pires/go-proxyproto" |
| 35 | "github.com/quic-go/quic-go" |
| 36 | "github.com/quic-go/quic-go/http3" |
| 37 | "go.uber.org/zap" |
| 38 | "go.uber.org/zap/zapcore" |
| 39 | "golang.org/x/net/http2" |
| 40 | |
| 41 | "github.com/caddyserver/caddy/v2" |
| 42 | "github.com/caddyserver/caddy/v2/caddyconfig" |
| 43 | "github.com/caddyserver/caddy/v2/modules/caddyhttp" |
| 44 | "github.com/caddyserver/caddy/v2/modules/caddyhttp/headers" |
| 45 | "github.com/caddyserver/caddy/v2/modules/caddytls" |
| 46 | "github.com/caddyserver/caddy/v2/modules/internal/network" |
| 47 | ) |
| 48 | |
| 49 | func init() { |
| 50 | caddy.RegisterModule(HTTPTransport{}) |
| 51 | } |
| 52 | |
| 53 | // HTTPTransport is essentially a configuration wrapper for http.Transport. |
| 54 | // It defines a JSON structure useful when configuring the HTTP transport |
| 55 | // for Caddy's reverse proxy. It builds its http.Transport at Provision. |
| 56 | type HTTPTransport struct { |
| 57 | // TODO: It's possible that other transports (like fastcgi) might be |
| 58 | // able to borrow/use at least some of these config fields; if so, |
| 59 | // maybe move them into a type called CommonTransport and embed it? |
| 60 | |
| 61 | // Configures the DNS resolver used to resolve the IP address of upstream hostnames. |
| 62 | Resolver *UpstreamResolver `json:"resolver,omitempty"` |
| 63 | |
| 64 | // Configures TLS to the upstream. Setting this to an empty struct |
| 65 | // is sufficient to enable TLS with reasonable defaults. |
| 66 | TLS *TLSConfig `json:"tls,omitempty"` |
| 67 | |
| 68 | // Configures HTTP Keep-Alive (enabled by default). Should only be |
| 69 | // necessary if rigorous testing has shown that tuning this helps |
| 70 | // improve performance. |
| 71 | KeepAlive *KeepAlive `json:"keep_alive,omitempty"` |
| 72 | |
| 73 | // Whether to enable compression to upstream. Default: true |
| 74 | Compression *bool `json:"compression,omitempty"` |
| 75 | |
| 76 | // Maximum number of connections per host. Default: 0 (no limit) |
| 77 | MaxConnsPerHost int `json:"max_conns_per_host,omitempty"` |
| 78 | |
| 79 | // If non-empty, which PROXY protocol version to send when |
| 80 | // connecting to an upstream. Default: off. |
| 81 | ProxyProtocol string `json:"proxy_protocol,omitempty"` |
| 82 | |
| 83 | // URL to the server that the HTTP transport will use to proxy |
| 84 | // requests to the upstream. See http.Transport.Proxy for |
| 85 | // information regarding supported protocols. This value takes |
| 86 | // precedence over `HTTP_PROXY`, etc. |
| 87 | // |
| 88 | // Providing a value to this parameter results in |
| 89 | // requests flowing through the reverse_proxy in the following |
| 90 | // way: |
| 91 | // |
| 92 | // User Agent -> |
| 93 | // reverse_proxy -> |
| 94 | // forward_proxy_url -> upstream |
| 95 | // |
| 96 | // Default: http.ProxyFromEnvironment |
| 97 | // DEPRECATED: Use NetworkProxyRaw|`network_proxy` instead. Subject to removal. |
| 98 | ForwardProxyURL string `json:"forward_proxy_url,omitempty"` |
| 99 | |
| 100 | // How long to wait before timing out trying to connect to |
| 101 | // an upstream. Default: `3s`. |
| 102 | DialTimeout caddy.Duration `json:"dial_timeout,omitempty"` |
| 103 | |
| 104 | // How long to wait before spawning an RFC 6555 Fast Fallback |
| 105 | // connection. A negative value disables this. Default: `300ms`. |
| 106 | FallbackDelay caddy.Duration `json:"dial_fallback_delay,omitempty"` |
| 107 | |
| 108 | // How long to wait for reading response headers from server. Default: No timeout. |
| 109 | ResponseHeaderTimeout caddy.Duration `json:"response_header_timeout,omitempty"` |
| 110 | |
| 111 | // The length of time to wait for a server's first response |
| 112 | // headers after fully writing the request headers if the |
| 113 | // request has a header "Expect: 100-continue". Default: No timeout. |
| 114 | ExpectContinueTimeout caddy.Duration `json:"expect_continue_timeout,omitempty"` |
| 115 | |
| 116 | // The maximum bytes to read from response headers. Default: `10MiB`. |
| 117 | MaxResponseHeaderSize int64 `json:"max_response_header_size,omitempty"` |
| 118 | |
| 119 | // The size of the write buffer in bytes. Default: `4KiB`. |
| 120 | WriteBufferSize int `json:"write_buffer_size,omitempty"` |
| 121 | |
| 122 | // The size of the read buffer in bytes. Default: `4KiB`. |
| 123 | ReadBufferSize int `json:"read_buffer_size,omitempty"` |
| 124 | |
| 125 | // The maximum time to wait for next read from backend. Default: no timeout. |
| 126 | ReadTimeout caddy.Duration `json:"read_timeout,omitempty"` |
| 127 | |
| 128 | // The maximum time to wait for next write to backend. Default: no timeout. |
| 129 | WriteTimeout caddy.Duration `json:"write_timeout,omitempty"` |
| 130 | |
| 131 | // The versions of HTTP to support. As a special case, "h2c" |
| 132 | // can be specified to use H2C (HTTP/2 over Cleartext) to the |
| 133 | // upstream (this feature is experimental and subject to |
| 134 | // change or removal). Default: ["1.1", "2"] |
| 135 | // |
| 136 | // EXPERIMENTAL: "3" enables HTTP/3, but it must be the only |
| 137 | // version specified if enabled. Additionally, HTTPS must be |
| 138 | // enabled to the upstream as HTTP/3 requires TLS. Subject |
| 139 | // to change or removal while experimental. |
| 140 | Versions []string `json:"versions,omitempty"` |
| 141 | |
| 142 | // Specify the address to bind to when connecting to an upstream. In other words, |
| 143 | // it is the address the upstream sees as the remote address. |
| 144 | LocalAddress string `json:"local_address,omitempty"` |
| 145 | |
| 146 | // The pre-configured underlying HTTP transport. |
| 147 | Transport *http.Transport `json:"-"` |
| 148 | |
| 149 | // The module that provides the network (forward) proxy |
| 150 | // URL that the HTTP transport will use to proxy |
| 151 | // requests to the upstream. See [http.Transport.Proxy](https://pkg.go.dev/net/http#Transport.Proxy) |
| 152 | // for information regarding supported protocols. |
| 153 | // |
| 154 | // Providing a value to this parameter results in requests |
| 155 | // flowing through the reverse_proxy in the following way: |
| 156 | // |
| 157 | // User Agent -> |
| 158 | // reverse_proxy -> |
| 159 | // [proxy provided by the module] -> upstream |
| 160 | // |
| 161 | // If nil, defaults to reading the `HTTP_PROXY`, |
| 162 | // `HTTPS_PROXY`, and `NO_PROXY` environment variables. |
| 163 | NetworkProxyRaw json.RawMessage `json:"network_proxy,omitempty" caddy:"namespace=caddy.network_proxy inline_key=from"` |
| 164 | |
| 165 | h3Transport *http3.Transport // TODO: EXPERIMENTAL (May 2024) |
| 166 | quicTransport *quic.Transport // used by h3Transport if sni placeholder is used, otherwise nil |
| 167 | } |
| 168 | |
| 169 | // CaddyModule returns the Caddy module information. |
| 170 | func (HTTPTransport) CaddyModule() caddy.ModuleInfo { |
| 171 | return caddy.ModuleInfo{ |
| 172 | ID: "http.reverse_proxy.transport.http", |
| 173 | New: func() caddy.Module { return new(HTTPTransport) }, |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | var ( |
| 178 | allowedVersions = []string{"1.1", "2", "h2c", "3"} |
| 179 | allowedVersionsString = strings.Join(allowedVersions, ", ") |
| 180 | ) |
| 181 | |
| 182 | // Provision sets up h.Transport with a *http.Transport |
| 183 | // that is ready to use. |
| 184 | func (h *HTTPTransport) Provision(ctx caddy.Context) error { |
| 185 | if len(h.Versions) == 0 { |
| 186 | h.Versions = []string{"1.1", "2"} |
| 187 | } |
| 188 | // some users may provide http versions not recognized by caddy, instead of trying to |
| 189 | // guess the version, we just error out and let the user fix their config |
| 190 | // see: https://github.com/caddyserver/caddy/issues/7111 |
| 191 | for _, v := range h.Versions { |
| 192 | if !slices.Contains(allowedVersions, v) { |
| 193 | return fmt.Errorf("unsupported HTTP version: %s, supported version: %s", v, allowedVersionsString) |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | rt, err := h.NewTransport(ctx) |
| 198 | if err != nil { |
| 199 | return err |
| 200 | } |
| 201 | h.Transport = rt |
| 202 | |
| 203 | return nil |
| 204 | } |
| 205 | |
| 206 | // NewTransport builds a standard-lib-compatible http.Transport value from h. |
| 207 | func (h *HTTPTransport) NewTransport(caddyCtx caddy.Context) (*http.Transport, error) { |
| 208 | // Set keep-alive defaults if it wasn't otherwise configured |
| 209 | if h.KeepAlive == nil { |
| 210 | h.KeepAlive = new(KeepAlive) |
| 211 | } |
| 212 | if h.KeepAlive.ProbeInterval == 0 { |
| 213 | h.KeepAlive.ProbeInterval = caddy.Duration(30 * time.Second) |
| 214 | } |
| 215 | if h.KeepAlive.IdleConnTimeout == 0 { |
| 216 | h.KeepAlive.IdleConnTimeout = caddy.Duration(2 * time.Minute) |
| 217 | } |
| 218 | if h.KeepAlive.MaxIdleConnsPerHost == 0 { |
| 219 | h.KeepAlive.MaxIdleConnsPerHost = 32 // seems about optimal, see #2805 |
| 220 | } |
| 221 | |
| 222 | // Set a relatively short default dial timeout. |
| 223 | // This is helpful to make load-balancer retries more speedy. |
| 224 | if h.DialTimeout == 0 { |
| 225 | h.DialTimeout = caddy.Duration(3 * time.Second) |
| 226 | } |
| 227 | |
| 228 | dialer := &net.Dialer{ |
| 229 | Timeout: time.Duration(h.DialTimeout), |
| 230 | FallbackDelay: time.Duration(h.FallbackDelay), |
| 231 | } |
| 232 | |
| 233 | if h.LocalAddress != "" { |
| 234 | netaddr, err := caddy.ParseNetworkAddressWithDefaults(h.LocalAddress, "tcp", 0) |
| 235 | if err != nil { |
| 236 | return nil, err |
| 237 | } |
| 238 | if netaddr.PortRangeSize() > 1 { |
| 239 | return nil, fmt.Errorf("local_address must be a single address, not a port range") |
| 240 | } |
| 241 | switch netaddr.Network { |
| 242 | case "tcp", "tcp4", "tcp6": |
| 243 | dialer.LocalAddr, err = net.ResolveTCPAddr(netaddr.Network, netaddr.JoinHostPort(0)) |
| 244 | if err != nil { |
| 245 | return nil, err |
| 246 | } |
| 247 | case "unix", "unixgram", "unixpacket": |
| 248 | dialer.LocalAddr, err = net.ResolveUnixAddr(netaddr.Network, netaddr.JoinHostPort(0)) |
| 249 | if err != nil { |
| 250 | return nil, err |
| 251 | } |
| 252 | case "udp", "udp4", "udp6": |
| 253 | return nil, fmt.Errorf("local_address must be a TCP address, not a UDP address") |
| 254 | default: |
| 255 | return nil, fmt.Errorf("unsupported network") |
| 256 | } |
| 257 | } |
| 258 | if h.Resolver != nil { |
| 259 | err := h.Resolver.ParseAddresses() |
| 260 | if err != nil { |
| 261 | return nil, err |
| 262 | } |
| 263 | d := &net.Dialer{ |
| 264 | Timeout: time.Duration(h.DialTimeout), |
| 265 | FallbackDelay: time.Duration(h.FallbackDelay), |
| 266 | } |
| 267 | dialer.Resolver = &net.Resolver{ |
| 268 | PreferGo: true, |
| 269 | Dial: func(ctx context.Context, _, _ string) (net.Conn, error) { |
| 270 | //nolint:gosec |
| 271 | addr := h.Resolver.netAddrs[weakrand.IntN(len(h.Resolver.netAddrs))] |
| 272 | return d.DialContext(ctx, addr.Network, addr.JoinHostPort(0)) |
| 273 | }, |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | dialContext := func(ctx context.Context, network, address string) (net.Conn, error) { |
| 278 | // The network is usually tcp, and the address is the host in http.Request.URL.Host |
| 279 | // and that's been overwritten in directRequest |
| 280 | // However, if proxy is used according to http.ProxyFromEnvironment or proxy providers, |
| 281 | // address will be the address of the proxy server. |
| 282 | |
| 283 | // This means we can safely use the address in dialInfo if proxy is not used (the address and network will be same any way) |
| 284 | // or if the upstream is unix (because there is no way socks or http proxy can be used for unix address). |
| 285 | if dialInfo, ok := GetDialInfo(ctx); ok { |
| 286 | if caddyhttp.GetVar(ctx, proxyVarKey) == nil || strings.HasPrefix(dialInfo.Network, "unix") { |
| 287 | network = dialInfo.Network |
| 288 | address = dialInfo.Address |
| 289 | } |
| 290 | } |
| 291 | |
| 292 | conn, err := dialer.DialContext(ctx, network, address) |
| 293 | if err != nil { |
| 294 | // identify this error as one that occurred during |
| 295 | // dialing, which can be important when trying to |
| 296 | // decide whether to retry a request |
| 297 | return nil, DialError{err} |
| 298 | } |
| 299 | keepConn := false |
| 300 | defer func() { |
| 301 | if !keepConn { |
| 302 | _ = conn.Close() |
| 303 | } |
| 304 | }() |
| 305 | |
| 306 | if h.ProxyProtocol != "" { |
| 307 | proxyProtocolInfo, ok := caddyhttp.GetVar(ctx, proxyProtocolInfoVarKey).(ProxyProtocolInfo) |
| 308 | if !ok { |
| 309 | return nil, fmt.Errorf("failed to get proxy protocol info from context") |
| 310 | } |
| 311 | var proxyv byte |
| 312 | switch h.ProxyProtocol { |
| 313 | case "v1": |
| 314 | proxyv = 1 |
| 315 | case "v2": |
| 316 | proxyv = 2 |
| 317 | default: |
| 318 | return nil, fmt.Errorf("unexpected proxy protocol version") |
| 319 | } |
| 320 | |
| 321 | // The src and dst have to be of the same address family. As we don't know the original |
| 322 | // dst address (it's kind of impossible to know) and this address is generally of very |
| 323 | // little interest, we just set it to all zeros. |
| 324 | var destAddr net.Addr |
| 325 | switch { |
| 326 | case proxyProtocolInfo.AddrPort.Addr().Is4(): |
| 327 | destAddr = &net.TCPAddr{ |
| 328 | IP: net.IPv4zero, |
| 329 | } |
| 330 | case proxyProtocolInfo.AddrPort.Addr().Is6(): |
| 331 | destAddr = &net.TCPAddr{ |
| 332 | IP: net.IPv6zero, |
| 333 | } |
| 334 | default: |
| 335 | return nil, fmt.Errorf("unexpected remote addr type in proxy protocol info") |
| 336 | } |
| 337 | sourceAddr := &net.TCPAddr{ |
| 338 | IP: proxyProtocolInfo.AddrPort.Addr().AsSlice(), |
| 339 | Port: int(proxyProtocolInfo.AddrPort.Port()), |
| 340 | Zone: proxyProtocolInfo.AddrPort.Addr().Zone(), |
| 341 | } |
| 342 | header := proxyproto.HeaderProxyFromAddrs(proxyv, sourceAddr, destAddr) |
| 343 | |
| 344 | // retain the log message structure |
| 345 | switch h.ProxyProtocol { |
| 346 | case "v1": |
| 347 | caddyCtx.Logger().Debug("sending proxy protocol header v1", zap.Any("header", header)) |
| 348 | case "v2": |
| 349 | caddyCtx.Logger().Debug("sending proxy protocol header v2", zap.Any("header", header)) |
| 350 | } |
| 351 | |
| 352 | _, err = header.WriteTo(conn) |
| 353 | if err != nil { |
| 354 | // identify this error as one that occurred during |
| 355 | // dialing, which can be important when trying to |
| 356 | // decide whether to retry a request |
| 357 | return nil, DialError{err} |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | // if read/write timeouts are configured and this is a TCP connection, |
| 362 | // enforce the timeouts by wrapping the connection with our own type |
| 363 | if tcpConn, ok := conn.(*net.TCPConn); ok && (h.ReadTimeout > 0 || h.WriteTimeout > 0) { |
| 364 | conn = &tcpRWTimeoutConn{ |
| 365 | TCPConn: tcpConn, |
| 366 | readTimeout: time.Duration(h.ReadTimeout), |
| 367 | writeTimeout: time.Duration(h.WriteTimeout), |
| 368 | logger: caddyCtx.Logger(), |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | keepConn = true |
| 373 | return conn, nil |
| 374 | } |
| 375 | |
| 376 | // negotiate any HTTP/SOCKS proxy for the HTTP transport |
| 377 | proxy := http.ProxyFromEnvironment |
| 378 | if h.ForwardProxyURL != "" { |
| 379 | caddyCtx.Logger().Warn("forward_proxy_url is deprecated; use network_proxy instead") |
| 380 | u := network.ProxyFromURL{URL: h.ForwardProxyURL} |
| 381 | h.NetworkProxyRaw = caddyconfig.JSONModuleObject(u, "from", "url", nil) |
| 382 | } |
| 383 | if len(h.NetworkProxyRaw) != 0 { |
| 384 | proxyMod, err := caddyCtx.LoadModule(h, "NetworkProxyRaw") |
| 385 | if err != nil { |
| 386 | return nil, fmt.Errorf("failed to load network_proxy module: %v", err) |
| 387 | } |
| 388 | if m, ok := proxyMod.(caddy.ProxyFuncProducer); ok { |
| 389 | proxy = m.ProxyFunc() |
| 390 | } else { |
| 391 | return nil, fmt.Errorf("network_proxy module is not `(func(*http.Request) (*url.URL, error))``") |
| 392 | } |
| 393 | } |
| 394 | // we need to keep track if a proxy is used for a request |
| 395 | proxyWrapper := func(req *http.Request) (*url.URL, error) { |
| 396 | if proxy == nil { |
| 397 | return nil, nil |
| 398 | } |
| 399 | u, err := proxy(req) |
| 400 | if u == nil || err != nil { |
| 401 | return u, err |
| 402 | } |
| 403 | // there must be a proxy for this request |
| 404 | caddyhttp.SetVar(req.Context(), proxyVarKey, u) |
| 405 | return u, nil |
| 406 | } |
| 407 | |
| 408 | rt := &http.Transport{ |
| 409 | Proxy: proxyWrapper, |
| 410 | DialContext: dialContext, |
| 411 | MaxConnsPerHost: h.MaxConnsPerHost, |
| 412 | ResponseHeaderTimeout: time.Duration(h.ResponseHeaderTimeout), |
| 413 | ExpectContinueTimeout: time.Duration(h.ExpectContinueTimeout), |
| 414 | MaxResponseHeaderBytes: h.MaxResponseHeaderSize, |
| 415 | WriteBufferSize: h.WriteBufferSize, |
| 416 | ReadBufferSize: h.ReadBufferSize, |
| 417 | } |
| 418 | |
| 419 | if h.TLS != nil { |
| 420 | rt.TLSHandshakeTimeout = time.Duration(h.TLS.HandshakeTimeout) |
| 421 | var err error |
| 422 | rt.TLSClientConfig, err = h.TLS.MakeTLSClientConfig(caddyCtx) |
| 423 | if err != nil { |
| 424 | return nil, fmt.Errorf("making TLS client config: %v", err) |
| 425 | } |
| 426 | |
| 427 | serverNameHasPlaceholder := strings.Contains(h.TLS.ServerName, "{") |
| 428 | |
| 429 | // We need to use custom DialTLSContext if: |
| 430 | // 1. ServerName has a placeholder that needs to be replaced at request-time, OR |
| 431 | // 2. ProxyProtocol is enabled, because req.URL.Host is modified to include |
| 432 | // client address info with "->" separator which breaks Go's address parsing |
| 433 | if serverNameHasPlaceholder || h.ProxyProtocol != "" { |
| 434 | rt.DialTLSContext = func(ctx context.Context, network, addr string) (net.Conn, error) { |
| 435 | // reuses the dialer from above to establish a plaintext connection |
| 436 | conn, err := dialContext(ctx, network, addr) |
| 437 | if err != nil { |
| 438 | return nil, err |
| 439 | } |
| 440 | |
| 441 | // but add our own handshake logic |
| 442 | tlsConfig := rt.TLSClientConfig.Clone() |
| 443 | if serverNameHasPlaceholder { |
| 444 | repl := ctx.Value(caddy.ReplacerCtxKey).(*caddy.Replacer) |
| 445 | tlsConfig.ServerName = repl.ReplaceAll(tlsConfig.ServerName, "") |
| 446 | } |
| 447 | |
| 448 | // h1 only |
| 449 | if caddyhttp.GetVar(ctx, tlsH1OnlyVarKey) == true { |
| 450 | // stdlib does this |
| 451 | // https://github.com/golang/go/blob/4837fbe4145cd47b43eed66fee9eed9c2b988316/src/net/http/transport.go#L1701 |
| 452 | tlsConfig.NextProtos = nil |
| 453 | } |
| 454 | |
| 455 | tlsConn := tls.Client(conn, tlsConfig) |
| 456 | |
| 457 | // complete the handshake before returning the connection |
| 458 | if rt.TLSHandshakeTimeout != 0 { |
| 459 | var cancel context.CancelFunc |
| 460 | ctx, cancel = context.WithTimeoutCause(ctx, rt.TLSHandshakeTimeout, fmt.Errorf("HTTP transport TLS handshake %ds timeout", int(rt.TLSHandshakeTimeout.Seconds()))) |
| 461 | defer cancel() |
| 462 | } |
| 463 | err = tlsConn.HandshakeContext(ctx) |
| 464 | if err != nil { |
| 465 | _ = tlsConn.Close() |
| 466 | return nil, err |
| 467 | } |
| 468 | return tlsConn, nil |
| 469 | } |
| 470 | } |
| 471 | } |
| 472 | |
| 473 | if h.KeepAlive != nil { |
| 474 | // according to https://pkg.go.dev/net#Dialer.KeepAliveConfig, |
| 475 | // KeepAlive is ignored if KeepAliveConfig.Enable is true. |
| 476 | // If configured to 0, a system-dependent default is used. |
| 477 | // To disable tcp keepalive, choose a negative value, |
| 478 | // so KeepAliveConfig.Enable is false and KeepAlive is negative. |
| 479 | |
| 480 | // This is different from http keepalive where a tcp connection |
| 481 | // can transfer multiple http requests/responses. |
| 482 | dialer.KeepAlive = time.Duration(h.KeepAlive.ProbeInterval) |
| 483 | dialer.KeepAliveConfig = net.KeepAliveConfig{ |
| 484 | Enable: h.KeepAlive.ProbeInterval > 0, |
| 485 | Interval: time.Duration(h.KeepAlive.ProbeInterval), |
| 486 | } |
| 487 | if h.KeepAlive.Enabled != nil { |
| 488 | rt.DisableKeepAlives = !*h.KeepAlive.Enabled |
| 489 | } |
| 490 | rt.MaxIdleConns = h.KeepAlive.MaxIdleConns |
| 491 | rt.MaxIdleConnsPerHost = h.KeepAlive.MaxIdleConnsPerHost |
| 492 | rt.IdleConnTimeout = time.Duration(h.KeepAlive.IdleConnTimeout) |
| 493 | } |
| 494 | |
| 495 | if h.Compression != nil { |
| 496 | rt.DisableCompression = !*h.Compression |
| 497 | } |
| 498 | |
| 499 | // configure HTTP/3 transport if enabled; however, this does not |
| 500 | // automatically fall back to lower versions like most web browsers |
| 501 | // do (that'd add latency and complexity, besides, we expect that |
| 502 | // site owners control the backends), so it must be exclusive |
| 503 | if len(h.Versions) == 1 && h.Versions[0] == "3" { |
| 504 | h.h3Transport = new(http3.Transport) |
| 505 | if h.TLS != nil { |
| 506 | // Reuse the TLS client config built above for the HTTP/1.1+2 |
| 507 | // transport rather than calling MakeTLSClientConfig again. |
| 508 | // Fixing: https://github.com/caddyserver/caddy/issues/8041 |
| 509 | h.h3Transport.TLSClientConfig = rt.TLSClientConfig.Clone() |
| 510 | |
| 511 | if strings.Contains(h.TLS.ServerName, "{") { |
| 512 | // copied from quic-go |
| 513 | udpConn, err := net.ListenUDP("udp", nil) |
| 514 | if err != nil { |
| 515 | return nil, fmt.Errorf("making udp socket for HTTP/3 transport: %v", err) |
| 516 | } |
| 517 | h.quicTransport = &quic.Transport{Conn: udpConn} |
| 518 | h.h3Transport.Dial = func(ctx context.Context, addr string, tlsCfg *tls.Config, cfg *quic.Config) (*quic.Conn, error) { |
| 519 | // tlsCfg is already cloned from h3Transport.TLSClientConfig |
| 520 | repl := ctx.Value(caddy.ReplacerCtxKey).(*caddy.Replacer) |
| 521 | tlsCfg.ServerName = repl.ReplaceAll(tlsCfg.ServerName, "") |
| 522 | udpAddr, err := resolveUDPAddr(ctx, "udp", addr) |
| 523 | if err != nil { |
| 524 | return nil, err |
| 525 | } |
| 526 | return h.quicTransport.DialEarly(ctx, udpAddr, tlsCfg, cfg) |
| 527 | } |
| 528 | } |
| 529 | } |
| 530 | } else if len(h.Versions) > 1 && slices.Contains(h.Versions, "3") { |
| 531 | return nil, fmt.Errorf("if HTTP/3 is enabled to the upstream, no other HTTP versions are supported") |
| 532 | } |
| 533 | |
| 534 | // if h2/c is enabled, configure it explicitly |
| 535 | if slices.Contains(h.Versions, "2") || slices.Contains(h.Versions, "h2c") { |
| 536 | // TODO: Migrate to http.Transport.Protocols once transport behaviour is covered. |
| 537 | //nolint:staticcheck |
| 538 | if err := http2.ConfigureTransport(rt); err != nil { |
| 539 | return nil, err |
| 540 | } |
| 541 | |
| 542 | // DisableCompression from h2 is configured by http2.ConfigureTransport |
| 543 | // Likewise, DisableKeepAlives from h1 is used too. |
| 544 | |
| 545 | // Protocols field is only used when the request is not using TLS, |
| 546 | // http1/2 over tls is still allowed |
| 547 | if slices.Contains(h.Versions, "h2c") { |
| 548 | rt.Protocols = new(http.Protocols) |
| 549 | rt.Protocols.SetUnencryptedHTTP2(true) |
| 550 | rt.Protocols.SetHTTP1(false) |
| 551 | } |
| 552 | } |
| 553 | |
| 554 | return rt, nil |
| 555 | } |
| 556 | |
| 557 | // TODO: EXPERIMENTAL (May 2025) |
| 558 | // copied from quic-go |
| 559 | func resolveUDPAddr(ctx context.Context, network, addr string) (*net.UDPAddr, error) { |
| 560 | host, portStr, err := net.SplitHostPort(addr) |
| 561 | if err != nil { |
| 562 | return nil, err |
| 563 | } |
| 564 | port, err := net.LookupPort(network, portStr) |
| 565 | if err != nil { |
| 566 | return nil, err |
| 567 | } |
| 568 | resolver := net.DefaultResolver |
| 569 | ipAddrs, err := resolver.LookupIPAddr(ctx, host) |
| 570 | if err != nil { |
| 571 | return nil, err |
| 572 | } |
| 573 | addrs := addrList(ipAddrs) |
| 574 | ip := addrs.forResolve(network, addr) |
| 575 | return &net.UDPAddr{IP: ip.IP, Port: port, Zone: ip.Zone}, nil |
| 576 | } |
| 577 | |
| 578 | // TODO: EXPERIMENTAL (May 2025) |
| 579 | // copied from quic-go |
| 580 | // An addrList represents a list of network endpoint addresses. |
| 581 | // Copy from [net.addrList] and change type from [net.Addr] to [net.IPAddr] |
| 582 | type addrList []net.IPAddr |
| 583 | |
| 584 | // isIPv4 reports whether addr contains an IPv4 address. |
| 585 | func isIPv4(addr net.IPAddr) bool { |
| 586 | return addr.IP.To4() != nil |
| 587 | } |
| 588 | |
| 589 | // isNotIPv4 reports whether addr does not contain an IPv4 address. |
| 590 | func isNotIPv4(addr net.IPAddr) bool { return !isIPv4(addr) } |
| 591 | |
| 592 | // forResolve returns the most appropriate address in address for |
| 593 | // a call to ResolveTCPAddr, ResolveUDPAddr, or ResolveIPAddr. |
| 594 | // IPv4 is preferred, unless addr contains an IPv6 literal. |
| 595 | func (addrs addrList) forResolve(network, addr string) net.IPAddr { |
| 596 | var want6 bool |
| 597 | switch network { |
| 598 | case "ip": |
| 599 | // IPv6 literal (addr does NOT contain a port) |
| 600 | want6 = strings.ContainsRune(addr, ':') |
| 601 | case "tcp", "udp": |
| 602 | // IPv6 literal. (addr contains a port, so look for '[') |
| 603 | want6 = strings.ContainsRune(addr, '[') |
| 604 | } |
| 605 | if want6 { |
| 606 | return addrs.first(isNotIPv4) |
| 607 | } |
| 608 | return addrs.first(isIPv4) |
| 609 | } |
| 610 | |
| 611 | // first returns the first address which satisfies strategy, or if |
| 612 | // none do, then the first address of any kind. |
| 613 | func (addrs addrList) first(strategy func(net.IPAddr) bool) net.IPAddr { |
| 614 | for _, addr := range addrs { |
| 615 | if strategy(addr) { |
| 616 | return addr |
| 617 | } |
| 618 | } |
| 619 | return addrs[0] |
| 620 | } |
| 621 | |
| 622 | // RequestHeaderOps implements TransportHeaderOpsProvider. It returns header |
| 623 | // operations for requests when the transport's configuration indicates they |
| 624 | // should be applied. In particular, when TLS is enabled for this transport, |
| 625 | // return an operation to set the Host header to the upstream host:port |
| 626 | // placeholder so HTTPS upstreams get the proper Host by default. |
| 627 | // |
| 628 | // Note: this is a provision-time hook; the Handler will call this during |
| 629 | // its Provision and cache the resulting HeaderOps. The HeaderOps are |
| 630 | // applied per-request (so placeholders are expanded at request time). |
| 631 | func (h *HTTPTransport) RequestHeaderOps() *headers.HeaderOps { |
| 632 | // If TLS is not configured for this transport, don't inject Host |
| 633 | // defaults. TLS being non-nil indicates HTTPS to the upstream. |
| 634 | if h.TLS == nil { |
| 635 | return nil |
| 636 | } |
| 637 | return &headers.HeaderOps{ |
| 638 | Set: http.Header{ |
| 639 | "Host": []string{"{http.reverse_proxy.upstream.hostport}"}, |
| 640 | }, |
| 641 | } |
| 642 | } |
| 643 | |
| 644 | // RoundTrip implements http.RoundTripper. |
| 645 | func (h *HTTPTransport) RoundTrip(req *http.Request) (*http.Response, error) { |
| 646 | h.SetScheme(req) |
| 647 | |
| 648 | // use HTTP/3 if enabled (TODO: This is EXPERIMENTAL) |
| 649 | if h.h3Transport != nil { |
| 650 | return h.h3Transport.RoundTrip(req) |
| 651 | } |
| 652 | |
| 653 | return h.Transport.RoundTrip(req) |
| 654 | } |
| 655 | |
| 656 | // SetScheme ensures that the outbound request req |
| 657 | // has the scheme set in its URL; the underlying |
| 658 | // http.Transport requires a scheme to be set. |
| 659 | // |
| 660 | // This method may be used by other transport modules |
| 661 | // that wrap/use this one. |
| 662 | func (h *HTTPTransport) SetScheme(req *http.Request) { |
| 663 | if req.URL.Scheme != "" { |
| 664 | return |
| 665 | } |
| 666 | if h.shouldUseTLS(req) { |
| 667 | req.URL.Scheme = "https" |
| 668 | } else { |
| 669 | req.URL.Scheme = "http" |
| 670 | } |
| 671 | } |
| 672 | |
| 673 | // shouldUseTLS returns true if TLS should be used for req. |
| 674 | func (h *HTTPTransport) shouldUseTLS(req *http.Request) bool { |
| 675 | if h.TLS == nil { |
| 676 | return false |
| 677 | } |
| 678 | |
| 679 | port := req.URL.Port() |
| 680 | return !slices.Contains(h.TLS.ExceptPorts, port) |
| 681 | } |
| 682 | |
| 683 | // TLSEnabled returns true if TLS is enabled. |
| 684 | func (h HTTPTransport) TLSEnabled() bool { |
| 685 | return h.TLS != nil |
| 686 | } |
| 687 | |
| 688 | // EnableTLS enables TLS on the transport. |
| 689 | func (h *HTTPTransport) EnableTLS(base *TLSConfig) error { |
| 690 | h.TLS = base |
| 691 | return nil |
| 692 | } |
| 693 | |
| 694 | // EnableH2C enables H2C (HTTP/2 over Cleartext) on the transport. |
| 695 | func (h *HTTPTransport) EnableH2C() error { |
| 696 | h.Versions = []string{"h2c", "2"} |
| 697 | return nil |
| 698 | } |
| 699 | |
| 700 | // OverrideHealthCheckScheme overrides the scheme of the given URL |
| 701 | // used for health checks. |
| 702 | func (h HTTPTransport) OverrideHealthCheckScheme(base *url.URL, port string) { |
| 703 | // if tls is enabled and the port isn't in the except list, use HTTPs |
| 704 | if h.TLSEnabled() && !slices.Contains(h.TLS.ExceptPorts, port) { |
| 705 | base.Scheme = "https" |
| 706 | } |
| 707 | } |
| 708 | |
| 709 | // ProxyProtocolEnabled returns true if proxy protocol is enabled. |
| 710 | func (h HTTPTransport) ProxyProtocolEnabled() bool { |
| 711 | return h.ProxyProtocol != "" |
| 712 | } |
| 713 | |
| 714 | // Cleanup implements caddy.CleanerUpper and closes any idle connections. |
| 715 | func (h HTTPTransport) Cleanup() error { |
| 716 | if h.Transport == nil { |
| 717 | return nil |
| 718 | } |
| 719 | h.Transport.CloseIdleConnections() |
| 720 | // h3 related cleanup, errors are ignored as nothing can be done. |
| 721 | // TODO: log these errors if any |
| 722 | if h.h3Transport != nil { |
| 723 | h.h3Transport.CloseIdleConnections() |
| 724 | _ = h.h3Transport.Close() |
| 725 | if h.quicTransport != nil { |
| 726 | _ = h.quicTransport.Close() |
| 727 | _ = h.quicTransport.Conn.Close() |
| 728 | } |
| 729 | } |
| 730 | return nil |
| 731 | } |
| 732 | |
| 733 | // TLSConfig holds configuration related to the TLS configuration for the |
| 734 | // transport/client. |
| 735 | type TLSConfig struct { |
| 736 | // Certificate authority module which provides the certificate pool of trusted certificates |
| 737 | CARaw json.RawMessage `json:"ca,omitempty" caddy:"namespace=tls.ca_pool.source inline_key=provider"` |
| 738 | |
| 739 | // Deprecated: Use the `ca` field with the `tls.ca_pool.source.inline` module instead. |
| 740 | // Optional list of base64-encoded DER-encoded CA certificates to trust. |
| 741 | RootCAPool []string `json:"root_ca_pool,omitempty"` |
| 742 | |
| 743 | // Deprecated: Use the `ca` field with the `tls.ca_pool.source.file` module instead. |
| 744 | // List of PEM-encoded CA certificate files to add to the same trust |
| 745 | // store as RootCAPool (or root_ca_pool in the JSON). |
| 746 | RootCAPEMFiles []string `json:"root_ca_pem_files,omitempty"` |
| 747 | |
| 748 | // PEM-encoded client certificate filename to present to servers. |
| 749 | ClientCertificateFile string `json:"client_certificate_file,omitempty"` |
| 750 | |
| 751 | // PEM-encoded key to use with the client certificate. |
| 752 | ClientCertificateKeyFile string `json:"client_certificate_key_file,omitempty"` |
| 753 | |
| 754 | // If specified, Caddy will use and automate a client certificate |
| 755 | // with this subject name. |
| 756 | ClientCertificateAutomate string `json:"client_certificate_automate,omitempty"` |
| 757 | |
| 758 | // If true, TLS verification of server certificates will be disabled. |
| 759 | // This is insecure and may be removed in the future. Do not use this |
| 760 | // option except in testing or local development environments. |
| 761 | InsecureSkipVerify bool `json:"insecure_skip_verify,omitempty"` |
| 762 | |
| 763 | // The duration to allow a TLS handshake to a server. Default: No timeout. |
| 764 | HandshakeTimeout caddy.Duration `json:"handshake_timeout,omitempty"` |
| 765 | |
| 766 | // The server name used when verifying the certificate received in the TLS |
| 767 | // handshake. By default, this will use the upstream address' host part. |
| 768 | // You only need to override this if your upstream address does not match the |
| 769 | // certificate the upstream is likely to use. For example if the upstream |
| 770 | // address is an IP address, then you would need to configure this to the |
| 771 | // hostname being served by the upstream server. Currently, this does not |
| 772 | // support placeholders because the TLS config is not provisioned on each |
| 773 | // connection, so a static value must be used. |
| 774 | ServerName string `json:"server_name,omitempty"` |
| 775 | |
| 776 | // TLS renegotiation level. TLS renegotiation is the act of performing |
| 777 | // subsequent handshakes on a connection after the first. |
| 778 | // The level can be: |
| 779 | // - "never": (the default) disables renegotiation. |
| 780 | // - "once": allows a remote server to request renegotiation once per connection. |
| 781 | // - "freely": allows a remote server to repeatedly request renegotiation. |
| 782 | Renegotiation string `json:"renegotiation,omitempty"` |
| 783 | |
| 784 | // Skip TLS ports specifies a list of upstream ports on which TLS should not be |
| 785 | // attempted even if it is configured. Handy when using dynamic upstreams that |
| 786 | // return HTTP and HTTPS endpoints too. |
| 787 | // When specified, TLS will automatically be configured on the transport. |
| 788 | // The value can be a list of any valid tcp port numbers, default empty. |
| 789 | ExceptPorts []string `json:"except_ports,omitempty"` |
| 790 | |
| 791 | // The list of elliptic curves to support. Caddy's |
| 792 | // defaults are modern and secure. |
| 793 | Curves []string `json:"curves,omitempty"` |
| 794 | } |
| 795 | |
| 796 | // MakeTLSClientConfig returns a tls.Config usable by a client to a backend. |
| 797 | // If there is no custom TLS configuration, a nil config may be returned. |
| 798 | func (t *TLSConfig) MakeTLSClientConfig(ctx caddy.Context) (*tls.Config, error) { |
| 799 | cfg := new(tls.Config) |
| 800 | |
| 801 | // client auth |
| 802 | if t.ClientCertificateFile != "" && t.ClientCertificateKeyFile == "" { |
| 803 | return nil, fmt.Errorf("client_certificate_file specified without client_certificate_key_file") |
| 804 | } |
| 805 | if t.ClientCertificateFile == "" && t.ClientCertificateKeyFile != "" { |
| 806 | return nil, fmt.Errorf("client_certificate_key_file specified without client_certificate_file") |
| 807 | } |
| 808 | if t.ClientCertificateFile != "" && t.ClientCertificateKeyFile != "" { |
| 809 | cert, err := tls.LoadX509KeyPair(t.ClientCertificateFile, t.ClientCertificateKeyFile) |
| 810 | if err != nil { |
| 811 | return nil, fmt.Errorf("loading client certificate key pair: %v", err) |
| 812 | } |
| 813 | cfg.Certificates = []tls.Certificate{cert} |
| 814 | } |
| 815 | if t.ClientCertificateAutomate != "" { |
| 816 | // TODO: use or enable ctx.IdentityCredentials() ... |
| 817 | tlsAppIface, err := ctx.App("tls") |
| 818 | if err != nil { |
| 819 | return nil, fmt.Errorf("getting tls app: %v", err) |
| 820 | } |
| 821 | tlsApp := tlsAppIface.(*caddytls.TLS) |
| 822 | err = tlsApp.Manage(map[string]struct{}{t.ClientCertificateAutomate: {}}) |
| 823 | if err != nil { |
| 824 | return nil, fmt.Errorf("managing client certificate: %v", err) |
| 825 | } |
| 826 | cfg.GetClientCertificate = func(cri *tls.CertificateRequestInfo) (*tls.Certificate, error) { |
| 827 | certs := caddytls.AllMatchingCertificates(t.ClientCertificateAutomate) |
| 828 | var err error |
| 829 | for _, cert := range certs { |
| 830 | certCertificate := cert.Certificate // avoid taking address of iteration variable (gosec warning) |
| 831 | err = cri.SupportsCertificate(&certCertificate) |
| 832 | if err == nil { |
| 833 | return &cert.Certificate, nil |
| 834 | } |
| 835 | } |
| 836 | if err == nil { |
| 837 | err = fmt.Errorf("no client certificate found for automate name: %s", t.ClientCertificateAutomate) |
| 838 | } |
| 839 | return nil, err |
| 840 | } |
| 841 | } |
| 842 | |
| 843 | // trusted root CAs |
| 844 | if len(t.RootCAPool) > 0 || len(t.RootCAPEMFiles) > 0 { |
| 845 | ctx.Logger().Warn("root_ca_pool and root_ca_pem_files are deprecated. Use one of the tls.ca_pool.source modules instead") |
| 846 | rootPool := x509.NewCertPool() |
| 847 | for _, encodedCACert := range t.RootCAPool { |
| 848 | caCert, err := decodeBase64DERCert(encodedCACert) |
| 849 | if err != nil { |
| 850 | return nil, fmt.Errorf("parsing CA certificate: %v", err) |
| 851 | } |
| 852 | rootPool.AddCert(caCert) |
| 853 | } |
| 854 | for _, pemFile := range t.RootCAPEMFiles { |
| 855 | pemData, err := os.ReadFile(pemFile) |
| 856 | if err != nil { |
| 857 | return nil, fmt.Errorf("failed reading ca cert: %v", err) |
| 858 | } |
| 859 | rootPool.AppendCertsFromPEM(pemData) |
| 860 | } |
| 861 | cfg.RootCAs = rootPool |
| 862 | } |
| 863 | |
| 864 | if t.CARaw != nil { |
| 865 | if len(t.RootCAPool) > 0 || len(t.RootCAPEMFiles) > 0 { |
| 866 | return nil, fmt.Errorf("conflicting config for Root CA pool") |
| 867 | } |
| 868 | caRaw, err := ctx.LoadModule(t, "CARaw") |
| 869 | if err != nil { |
| 870 | return nil, fmt.Errorf("failed to load ca module: %v", err) |
| 871 | } |
| 872 | ca, ok := caRaw.(caddytls.CA) |
| 873 | if !ok { |
| 874 | return nil, fmt.Errorf("CA module '%s' is not a certificate pool provider", ca) |
| 875 | } |
| 876 | cfg.RootCAs = ca.CertPool() |
| 877 | } |
| 878 | |
| 879 | // Renegotiation |
| 880 | switch t.Renegotiation { |
| 881 | case "never", "": |
| 882 | cfg.Renegotiation = tls.RenegotiateNever |
| 883 | case "once": |
| 884 | cfg.Renegotiation = tls.RenegotiateOnceAsClient |
| 885 | case "freely": |
| 886 | cfg.Renegotiation = tls.RenegotiateFreelyAsClient |
| 887 | default: |
| 888 | return nil, fmt.Errorf("invalid TLS renegotiation level: %v", t.Renegotiation) |
| 889 | } |
| 890 | |
| 891 | // override for the server name used verify the TLS handshake |
| 892 | cfg.ServerName = t.ServerName |
| 893 | |
| 894 | // throw all security out the window |
| 895 | cfg.InsecureSkipVerify = t.InsecureSkipVerify |
| 896 | |
| 897 | curvesAdded := make(map[tls.CurveID]struct{}) |
| 898 | for _, curveName := range t.Curves { |
| 899 | curveID, ok := caddytls.SupportedCurves[curveName] |
| 900 | if !ok { |
| 901 | return nil, fmt.Errorf("unsupported curve: %s", curveName) |
| 902 | } |
| 903 | if _, ok := curvesAdded[curveID]; !ok { |
| 904 | curvesAdded[curveID] = struct{}{} |
| 905 | cfg.CurvePreferences = append(cfg.CurvePreferences, curveID) |
| 906 | } |
| 907 | } |
| 908 | |
| 909 | // only return a config if it's not empty |
| 910 | if reflect.DeepEqual(cfg, new(tls.Config)) { |
| 911 | return nil, nil |
| 912 | } |
| 913 | |
| 914 | return cfg, nil |
| 915 | } |
| 916 | |
| 917 | // KeepAlive holds configuration pertaining to HTTP Keep-Alive. |
| 918 | type KeepAlive struct { |
| 919 | // Whether HTTP Keep-Alive is enabled. Default: `true` |
| 920 | Enabled *bool `json:"enabled,omitempty"` |
| 921 | |
| 922 | // How often to probe for liveness. Default: `30s`. |
| 923 | ProbeInterval caddy.Duration `json:"probe_interval,omitempty"` |
| 924 | |
| 925 | // Maximum number of idle connections. Default: `0`, which means no limit. |
| 926 | MaxIdleConns int `json:"max_idle_conns,omitempty"` |
| 927 | |
| 928 | // Maximum number of idle connections per host. Default: `32`. |
| 929 | MaxIdleConnsPerHost int `json:"max_idle_conns_per_host,omitempty"` |
| 930 | |
| 931 | // How long connections should be kept alive when idle. Default: `2m`. |
| 932 | IdleConnTimeout caddy.Duration `json:"idle_timeout,omitempty"` |
| 933 | } |
| 934 | |
| 935 | // tcpRWTimeoutConn enforces read/write timeouts for a TCP connection. |
| 936 | // If it fails to set deadlines, the error is logged but does not abort |
| 937 | // the read/write attempt (ignoring the error is consistent with what |
| 938 | // the standard library does: https://github.com/golang/go/blob/c5da4fb7ac5cb7434b41fc9a1df3bee66c7f1a4d/src/net/http/server.go#L981-L986) |
| 939 | type tcpRWTimeoutConn struct { |
| 940 | *net.TCPConn |
| 941 | readTimeout, writeTimeout time.Duration |
| 942 | logger *zap.Logger |
| 943 | } |
| 944 | |
| 945 | func (c *tcpRWTimeoutConn) Read(b []byte) (int, error) { |
| 946 | if c.readTimeout > 0 { |
| 947 | err := c.TCPConn.SetReadDeadline(time.Now().Add(c.readTimeout)) |
| 948 | if err != nil { |
| 949 | if ce := c.logger.Check(zapcore.ErrorLevel, "failed to set read deadline"); ce != nil { |
| 950 | ce.Write(zap.Error(err)) |
| 951 | } |
| 952 | } |
| 953 | } |
| 954 | return c.TCPConn.Read(b) |
| 955 | } |
| 956 | |
| 957 | func (c *tcpRWTimeoutConn) Write(b []byte) (int, error) { |
| 958 | if c.writeTimeout > 0 { |
| 959 | err := c.TCPConn.SetWriteDeadline(time.Now().Add(c.writeTimeout)) |
| 960 | if err != nil { |
| 961 | if ce := c.logger.Check(zapcore.ErrorLevel, "failed to set write deadline"); ce != nil { |
| 962 | ce.Write(zap.Error(err)) |
| 963 | } |
| 964 | } |
| 965 | } |
| 966 | return c.TCPConn.Write(b) |
| 967 | } |
| 968 | |
| 969 | // decodeBase64DERCert base64-decodes, then DER-decodes, certStr. |
| 970 | func decodeBase64DERCert(certStr string) (*x509.Certificate, error) { |
| 971 | // decode base64 |
| 972 | derBytes, err := base64.StdEncoding.DecodeString(certStr) |
| 973 | if err != nil { |
| 974 | return nil, err |
| 975 | } |
| 976 | |
| 977 | // parse the DER-encoded certificate |
| 978 | return x509.ParseCertificate(derBytes) |
| 979 | } |
| 980 | |
| 981 | // Interface guards |
| 982 | var ( |
| 983 | _ caddy.Provisioner = (*HTTPTransport)(nil) |
| 984 | _ http.RoundTripper = (*HTTPTransport)(nil) |
| 985 | _ caddy.CleanerUpper = (*HTTPTransport)(nil) |
| 986 | _ TLSTransport = (*HTTPTransport)(nil) |
| 987 | _ H2CTransport = (*HTTPTransport)(nil) |
| 988 | _ HealthCheckSchemeOverriderTransport = (*HTTPTransport)(nil) |
| 989 | _ ProxyProtocolTransport = (*HTTPTransport)(nil) |
| 990 | ) |