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feature: switch to utls to defeat JA3 fingerprinting
Borrowed code from https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/meek/-/tree/main/meek-client
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| package tun | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "encoding/base64" | ||
| "fmt" | ||
| "net" | ||
| "net/http" | ||
| "net/url" | ||
|
|
||
| utls "github.com/refraction-networking/utls" | ||
| "golang.org/x/net/proxy" | ||
| ) | ||
|
|
||
| // https://tools.ietf.org/html/rfc7231#section-4.3.6 | ||
| // Conceivably we could also proxy over HTTP/2: | ||
| // https://httpwg.org/specs/rfc7540.html#CONNECT | ||
| // https://github.com/caddyserver/forwardproxy/blob/05b2092e07f9d10b3803d8fb9775d2f87dc58590/httpclient/httpclient.go | ||
|
|
||
| type httpProxy struct { | ||
| network, addr string | ||
| auth *proxy.Auth | ||
| forward proxy.Dialer | ||
| } | ||
|
|
||
| func (pr *httpProxy) Dial(network, addr string) (net.Conn, error) { | ||
| connectReq := &http.Request{ | ||
| Method: "CONNECT", | ||
| URL: &url.URL{Opaque: addr}, | ||
| Host: addr, | ||
| Header: make(http.Header), | ||
| } | ||
| // http.Transport has a ProxyConnectHeader field that we are ignoring | ||
| // here. | ||
| if pr.auth != nil { | ||
| connectReq.Header.Set("Proxy-Authorization", "basic "+ | ||
| base64.StdEncoding.EncodeToString([]byte(pr.auth.User+":"+pr.auth.Password))) | ||
| } | ||
|
|
||
| conn, err := pr.forward.Dial(pr.network, pr.addr) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| err = connectReq.Write(conn) | ||
| if err != nil { | ||
| conn.Close() | ||
| return nil, err | ||
| } | ||
|
|
||
| // The Go stdlib says: "Okay to use and discard buffered reader here, | ||
| // because TLS server will not speak until spoken to." | ||
| br := bufio.NewReader(conn) | ||
| resp, err := http.ReadResponse(br, connectReq) | ||
| if br.Buffered() != 0 { | ||
| panic(br.Buffered()) | ||
| } | ||
| if err != nil { | ||
| conn.Close() | ||
| return nil, err | ||
| } | ||
| if resp.StatusCode != 200 { | ||
| conn.Close() | ||
| return nil, fmt.Errorf("proxy server returned %q", resp.Status) | ||
| } | ||
|
|
||
| return conn, nil | ||
| } | ||
|
|
||
| func ProxyHTTP(network, addr string, auth *proxy.Auth, forward proxy.Dialer) (*httpProxy, error) { | ||
| return &httpProxy{ | ||
| network: network, | ||
| addr: addr, | ||
| auth: auth, | ||
| forward: forward, | ||
| }, nil | ||
| } | ||
|
|
||
| type UTLSDialer struct { | ||
| config *utls.Config | ||
| clientHelloID *utls.ClientHelloID | ||
| forward proxy.Dialer | ||
| } | ||
|
|
||
| func (dialer *UTLSDialer) Dial(network, addr string) (net.Conn, error) { | ||
| return dialUTLS(network, addr, dialer.config, dialer.clientHelloID, dialer.forward) | ||
| } | ||
|
|
||
| func ProxyHTTPS(network, addr string, auth *proxy.Auth, forward proxy.Dialer, cfg *utls.Config, clientHelloID *utls.ClientHelloID) (*httpProxy, error) { | ||
| return &httpProxy{ | ||
| network: network, | ||
| addr: addr, | ||
| auth: auth, | ||
| forward: &UTLSDialer{ | ||
| config: cfg, | ||
| // We use the same uTLS ClientHelloID for the TLS | ||
| // connection to the HTTPS proxy, as we use for the TLS | ||
| // connection through the tunnel. | ||
| clientHelloID: clientHelloID, | ||
| forward: forward, | ||
| }, | ||
| }, nil | ||
| } |
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