/
server-https.go
209 lines (179 loc) · 4.77 KB
/
server-https.go
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package main
import (
"bufio"
"crypto/tls"
"io"
"net"
"net/http"
"strconv"
"strings"
"github.com/getsentry/sentry-go"
)
const (
MaxRequestBody = 10 * 1024 * 1024 // 10 MiB
)
var (
connectionEstablishedKA = []byte("HTTP/1.1 200 Connection Established\r\nConnection: keep-alive\r\nKeep-Alive: timeout=30\r\n\r\n")
connectionEstablished = []byte("HTTP/1.1 200 Connection Established\r\nConnection: close\r\n\r\n")
connectionFailed = []byte("HTTP/1.1 502 Connection Failed\r\nConnection: close\r\n\r\n")
)
func (s *streamingRespiratorServer) handleProxyHttps(w http.ResponseWriter, r *http.Request) {
if !s.checkProxyAuth(w, r) {
return
}
hi, ok := w.(http.Hijacker)
if !ok {
w.WriteHeader(http.StatusInternalServerError)
return
}
clientConn, _, err := hi.Hijack()
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
return
}
defer clientConn.Close()
// 웹소켓은 MITM 안함
host, _, _ := net.SplitHostPort(s.getHost(r, 443))
switch host {
case "api.twitter.com":
fallthrough
case "userstream.twitter.com":
s.handleProxyHttpsMitm(clientConn, r)
return
}
s.handleProxyHttpsTunnel(clientConn, r)
}
func (s *streamingRespiratorServer) handleProxyHttpsMitm(clientConn net.Conn, r *http.Request) {
var err error
if strings.ToLower(r.Header.Get("Proxy-Connection")) == "keep-alive" ||
strings.ToLower(r.Header.Get("Connection")) == "keep-alive" {
_, err = clientConn.Write(connectionEstablishedKA)
} else {
_, err = clientConn.Write(connectionEstablished)
}
if err != nil {
return
}
clientConnTls := tls.Server(clientConn, s.tlsConfig)
if err = clientConnTls.Handshake(); err != nil {
logger.Printf("%+v\n", err)
sentry.CaptureException(err.(error))
return
}
clientConnTlsReader := bufio.NewReader(clientConnTls)
for {
if _, err := clientConnTlsReader.Peek(1); err == io.EOF {
return
}
r, err = http.ReadRequest(clientConnTlsReader)
if err != nil && err != io.EOF {
logger.Printf("%+v\n", err)
sentry.CaptureException(err.(error))
return
}
r.URL.Scheme = "https"
//////////////////////////////////////////////////
if s.isWebsocket(r) {
s.handleProxyWebSocket(clientConnTls, clientConnTlsReader, r, true)
return
}
//////////////////////////////////////////////////
// 너무 큰 Request 는 스킵한다.
if contentLength, err := strconv.ParseInt(r.Header.Get("Content-Type"), 10, 64); err == nil {
if contentLength > MaxRequestBody {
resp := http.Response{
StatusCode: http.StatusRequestEntityTooLarge,
Body: nil,
}
err = resp.Write(clientConnTls)
if err != nil && err != io.EOF {
logger.Printf("%+v\n", err)
sentry.CaptureException(err.(error))
return
}
continue
}
}
rbr, rbw := io.Pipe()
respWriter := ProxyResponseWriter{
w: rbw,
header: make(http.Header),
statusCode: make(chan int),
}
if r.Host == "api.twitter.com" {
go func() {
s.handleApi(&respWriter, r)
rbw.Close()
}()
} else {
go func() {
s.handleStreaming(&respWriter, r)
rbw.Close()
}()
}
respStatusCode := <-respWriter.statusCode
resp := http.Response{
StatusCode: respStatusCode,
Header: respWriter.header,
ContentLength: respWriter.contentLength,
Body: rbr,
/**
Body: &debugStream{
name: r.URL.String(),
ioi: rbr,
},
*/
}
s.setResponse(&resp, r)
err = resp.Write(clientConnTls)
rbr.Close()
rbw.Close()
if err != nil && err != io.EOF {
logger.Printf("%+v\n", err)
sentry.CaptureException(err.(error))
return
}
}
}
func (s *streamingRespiratorServer) handleProxyHttpsTunnel(clientConn net.Conn, r *http.Request) {
remoteConn, err := net.Dial("tcp", s.getHost(r, 443))
if err != nil {
logger.Printf("%+v\n", err)
sentry.CaptureException(err.(error))
clientConn.Write(connectionFailed)
return
}
defer remoteConn.Close()
switch {
case strings.ToLower(r.Header.Get("Proxy-Connection")) == "keep-alive":
fallthrough
case strings.ToLower(r.Header.Get("Connection")) == "keep-alive":
_, err = clientConn.Write(connectionEstablishedKA)
default:
_, err = clientConn.Write(connectionEstablished)
}
if err != nil {
logger.Printf("%+v\n", err)
sentry.CaptureException(err.(error))
return
}
s.copy(clientConn, bufio.NewReader(clientConn), remoteConn, r.Context())
}
type ProxyResponseWriter struct {
statusCode chan int
header http.Header
contentLength int64
w io.Writer
}
func (w *ProxyResponseWriter) Header() http.Header {
return w.header
}
func (w *ProxyResponseWriter) Write(p []byte) (int, error) {
return w.w.Write(p)
}
func (w *ProxyResponseWriter) WriteHeader(statusCode int) {
if c, err := strconv.ParseInt(w.header.Get("Content-Length"), 10, 64); err == nil {
w.contentLength = c
}
w.statusCode <- statusCode
}