/
server.go
642 lines (595 loc) · 18.7 KB
/
server.go
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/*
* Copyright (c) 2016 Moriyoshi Koizumi
* Copyright (c) 2012 Elazar Leibovich.
* Copyright (c) 2012 The Go Authors.
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Elazar Leibovich. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package main
import (
"bufio"
"context"
"crypto/tls"
"fmt"
"io"
"net"
"net/http"
"net/textproto"
"net/url"
"strings"
"sync/atomic"
"time"
"github.com/moriyoshi/devproxy/httpx"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
type ResponseFilter interface {
Filter(*http.Response, *OurProxyCtx) (*http.Response, error)
}
type OurProxyHttpServer struct {
Ctx *DevProxy
Logger *logrus.Logger
Tr *httpx.Transport
TLSConfigFactory TLSConfigFactory
ResponseFilters []ResponseFilter
SessionSerial int64
}
type OurProxyCtx struct {
Proxy *OurProxyHttpServer
Logger *logrus.Logger
OrigReq *http.Request
Req *http.Request
OrigResp *http.Response
Resp *http.Response
Tr *httpx.Transport
ResponseFilters []ResponseFilter
Error error
Session int64
}
type ResponseWriter struct {
conn net.Conn
brw *bufio.ReadWriter
header http.Header
headerWritten bool
protoMajor, protoMinor int
}
var proxyContextKey string = "devproxy:proxyCtx"
func makeHttp10Response(header string, body string) string {
return header + "\r\n" + fmt.Sprintf("Content-Length: %d\r\n", len(body)) + "Connection: close\r\n\r\n" + body
}
func isWebSocketReq(req *http.Request) bool {
connHdr := req.Header.Get("Connection")
if httpx.HasToken(connHdr, "upgrade") {
upgradeHdr := req.Header.Get("Upgrade")
if strings.ToLower(upgradeHdr) == "websocket" {
return true
}
}
return false
}
func removeProxyHeaders(r *http.Request) {
r.RequestURI = ""
r.Header.Del("Proxy-Connection")
r.Header.Del("Proxy-Authenticate")
r.Header.Del("Proxy-Authorization")
}
func translateToWebsocketURL(u *url.URL) *url.URL {
v := *u
switch u.Scheme {
case "http":
v.Scheme = "ws"
case "https":
v.Scheme = "wss"
default:
return nil
}
return &v
}
var contentTypeKey = http.CanonicalHeaderKey("Content-Type")
var http10BadGatewayBytes = []byte(makeHttp10Response("HTTP/1.0 502 Bad Gateway", "<html><body><h1>Bad Gateway</h1></body></html>"))
var http10OkBytes = []byte("HTTP/1.0 200 OK\r\n\r\n")
func NewResponseWriter(conn net.Conn, protoMajor, protoMinor int) *ResponseWriter {
return &ResponseWriter{
conn: conn,
header: make(http.Header),
brw: bufio.NewReadWriter(
bufio.NewReader(conn),
bufio.NewWriter(conn),
),
protoMajor: protoMajor,
protoMinor: protoMinor,
}
}
func (rw *ResponseWriter) Header() http.Header {
return rw.header
}
func (rw *ResponseWriter) Write(b []byte) (int, error) {
if !rw.headerWritten {
rw.WriteHeader(http.StatusOK)
}
return rw.Write(b)
}
func (rw *ResponseWriter) WriteHeader(statusCode int) {
if rw.writeHeader(statusCode) != nil {
return
}
rw.headerWritten = true
}
func (rw *ResponseWriter) writeHeader(statusCode int) error {
statusText := http.StatusText(statusCode)
if statusText == "" {
statusText = fmt.Sprintf("status code %d", statusCode)
}
_, err := fmt.Fprintf(rw.brw, "HTTP/%d.%d %03d %s\r\n", rw.protoMajor, rw.protoMinor, statusCode, statusText)
if err != nil {
return errors.Wrapf(err, "failed to send HTTP status header")
}
err = rw.header.Write(rw.brw)
if err != nil {
return errors.Wrapf(err, "failed to send HTTP headers")
}
_, err = rw.brw.WriteString("\r\n")
if err != nil {
return errors.Wrapf(err, "failed to send HTTP header epilogue")
}
return nil
}
func (rw *ResponseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
return rw.conn, rw.brw, nil
}
func (proxyCtx *OurProxyCtx) NewTLSConfig(r *http.Request) (*tls.Config, error) {
return proxyCtx.Proxy.TLSConfigFactory(r.URL.Host, proxyCtx)
}
func (proxyCtx *OurProxyCtx) FilterRequest(r *http.Request) (req *http.Request, resp *http.Response) {
for _, perHostConfig := range proxyCtx.Proxy.Ctx.Config.Hosts {
if proxyCtx.Proxy.Ctx.checkIfRequestMatchesToUrl(perHostConfig.Host, false, r, proxyCtx) {
return FilterRequest(perHostConfig, r, proxyCtx)
}
}
return r, nil
}
func (proxyCtx *OurProxyCtx) FilterResponse(resp *http.Response) *http.Response {
proxyCtx.Logger.Debugf("applying %d response filters", len(proxyCtx.ResponseFilters))
for _, f := range proxyCtx.ResponseFilters {
newResp, err := f.Filter(resp, proxyCtx)
if err != nil {
proxyCtx.Logger.Errorf("failed to run the response filter: %s", err.Error())
return proxyCtx.OrigResp
}
proxyCtx.Resp = newResp
resp = newResp
}
return resp
}
func (proxy *OurProxyHttpServer) HandleNonProxyRequest(w http.ResponseWriter, r *http.Request) {
http.Error(w, "This is a proxy server. Does not respond to non-proxy requests.", 400)
}
/* --- BEGIN pasted from src/net/http/client.go -- */
// cancelTimerBody is an io.ReadCloser that wraps rc with two features:
// 1) on Read EOF or Close, the timer t is Stopped,
// 2) On Read failure, if reqWasCanceled is true, the error is wrapped and
// marked as net.Error that hit its timeout.
type cancelTimerBody struct {
t *time.Timer
rc io.ReadCloser
canceled *int32
}
func (b *cancelTimerBody) Read(p []byte) (n int, err error) {
n, err = b.rc.Read(p)
if err == io.EOF {
b.t.Stop()
} else if err != nil && atomic.LoadInt32(b.canceled) != 0 {
return n, errors.Wrapf(err, "timeout exceeded")
}
return
}
func (b *cancelTimerBody) Close() error {
err := b.rc.Close()
b.t.Stop()
return err
}
/* --- END pasted from src/net/http/client.go -- */
func (proxyCtx *OurProxyCtx) DoRequest(req *http.Request, respW http.ResponseWriter, timeout time.Duration) (*http.Response, error) {
defer func() {
if req.Body != nil {
req.Body.Close()
}
}()
if isWebSocketReq(req) {
proxyCtx.Logger.Debugf("handling WebSocket handshake: %v", req.URL)
cm, err := proxyCtx.Tr.ConnectMethodForRequest(&httpx.TransportRequest{Request: req, Extra: nil})
if err != nil {
return nil, errors.Wrapf(err, "failed to create a ConnectMethod struct")
}
obConn, _, _, _, err := proxyCtx.Tr.DoDial(req.Context(), cm)
if err != nil {
return nil, errors.Wrapf(err, "failed to dial to remote server")
}
err = req.Write(obConn)
if err != nil {
obConn.Close()
return nil, err
}
hijacker, ok := respW.(http.Hijacker)
if !ok {
obConn.Close()
return nil, errors.Errorf("responseWriter does not implement http.Hijacker")
}
ibConn, brw, err := hijacker.Hijack()
if err != nil {
obConn.Close()
return nil, err
}
err = brw.Flush()
if err != nil {
ibConn.Close()
obConn.Close()
return nil, err
}
if brw.Reader.Buffered() > 0 {
ibConn.Close()
obConn.Close()
return nil, errors.Errorf("client sent data before handshake is complete")
}
proxyCtx.Logger.Debugf("established bidi tunnel between %v and %v", obConn.RemoteAddr(), ibConn.RemoteAddr())
proxyCtx.Proxy.Ctx.bidiTunnel(obConn, ibConn)
proxyCtx.Logger.Debugf("discarded bidi tunnel between %v and %v", obConn.RemoteAddr(), ibConn.RemoteAddr())
return nil, nil
} else {
timer := (*time.Timer)(nil)
canceled := int32(0)
if timeout > 0 {
timer = time.AfterFunc(timeout, func() {
atomic.StoreInt32(&canceled, 1)
proxyCtx.Tr.CancelRequest(req, fmt.Errorf("timeout exceeded"))
})
}
resp, err := proxyCtx.Tr.RoundTrip(req)
if err != nil {
if atomic.LoadInt32(&canceled) != 0 {
return nil, errors.Wrapf(err, "timeout exceeded")
}
return nil, errors.Wrapf(err, "failed to do the roundtrip")
}
if timer != nil {
resp.Body = &cancelTimerBody{
t: timer,
rc: resp.Body,
canceled: &canceled,
}
}
return resp, nil
}
}
func (proxyCtx *OurProxyCtx) HandleConnect(r *http.Request, proxyClient net.Conn) {
defer proxyClient.Close()
var targetHostPort string
{
pair := splitHostPort(r.URL.Host)
if pair.Port == "" {
pair.Port = "443" // this may be a bad assumption
}
targetHostPort = pair.String()
}
for _, perHostConfig := range proxyCtx.Proxy.Ctx.Config.Hosts {
if proxyCtx.Proxy.Ctx.checkIfTunnelRequestMatchesToUrl(perHostConfig.Host, r, proxyCtx) {
tlsConfig, err := proxyCtx.NewTLSConfig(r)
if err != nil {
proxyCtx.Logger.Errorf("failed to create tls.Config (%s)", err.Error())
if _, err := proxyClient.Write(http10BadGatewayBytes); err != nil {
proxyCtx.Logger.Errorf("failed to send response to client (%s)", err.Error())
}
return
}
_, err = proxyClient.Write(http10OkBytes)
if err != nil {
proxyCtx.Logger.Errorf("failed to send response to client (%s)", err.Error())
return
}
clientTlsConn := tls.Server(proxyClient, tlsConfig)
err = clientTlsConn.Handshake()
if err != nil {
proxyCtx.Logger.Errorf("TLS handshake with the client failed (%s)", err.Error())
return
}
defer func() {
if err := clientTlsConn.Close(); err != nil {
proxyCtx.Logger.Warnf("failed to close connection (%s)", err.Error())
}
}()
clientBufReader := bufio.NewReader(clientTlsConn)
req, err := http.ReadRequest(clientBufReader)
if err != nil {
proxyCtx.Logger.Errorf("failed to read request from the target (%s)", err.Error())
if _, err := clientTlsConn.Write(http10BadGatewayBytes); err != nil {
proxyCtx.Logger.Errorf("failed to send response to client (%s)", err.Error())
}
return
}
nestedProxyCtx := new(OurProxyCtx)
*nestedProxyCtx = *proxyCtx
req = req.WithContext(
context.WithValue(
r.Context(),
proxyContextKey,
nestedProxyCtx,
),
)
nestedProxyCtx.OrigReq = req
nestedProxyCtx.Req = req
req.URL.Scheme = "https"
req.URL.Host = targetHostPort
req.RequestURI = req.URL.String()
req, resp := FilterRequest(perHostConfig, req, nestedProxyCtx)
nestedProxyCtx.Req = req
if resp == nil {
removeProxyHeaders(req)
respW := NewResponseWriter(clientTlsConn, req.ProtoMajor, req.ProtoMinor)
resp, err = nestedProxyCtx.DoRequest(req, respW, 0)
if err != nil {
nestedProxyCtx.Logger.Errorf("failed to read response from the target (%s)", err.Error())
if _, err := clientTlsConn.Write(http10BadGatewayBytes); err != nil {
nestedProxyCtx.Logger.Errorf("failed to send response to client (%s)", err.Error())
}
return
}
}
if resp != nil {
nestedProxyCtx.OrigResp = resp
resp = nestedProxyCtx.FilterResponse(resp)
resp.ContentLength = -1
if resp.Header != nil {
resp.Header.Del("Content-Length")
}
err = resp.Write(clientTlsConn)
if err != nil {
nestedProxyCtx.Logger.Errorf("failed to send response to the client (%s)", err.Error())
}
}
return
}
}
proxyCtx.Logger.Debugf("Connecting to %s", targetHostPort)
targetConn, err := proxyCtx.Proxy.ConnectDial(r.Context(), targetHostPort)
if err != nil {
proxyCtx.Logger.Errorf("failed to connect to %s (%s)", targetHostPort, err.Error())
if _, err := proxyClient.Write(http10BadGatewayBytes); err != nil {
proxyCtx.Logger.Errorf("failed to send response to client (%s)", err.Error())
}
return
}
defer func() {
if err := targetConn.Close(); err != nil {
proxyCtx.Logger.Warnf("failed to close connection (%s)", err.Error())
}
}()
_, err = proxyClient.Write(http10OkBytes)
if err != nil {
proxyCtx.Logger.Errorf("failed to send response to client (%s)", err.Error())
return
}
proxyCtx.Proxy.Ctx.bidiTunnel(proxyClient, targetConn)
}
func (proxyCtx *OurProxyCtx) SendToClient(w http.ResponseWriter, resp *http.Response) {
dest := w.Header()
for headerName, headerValues := range resp.Header {
dest[headerName] = headerValues
}
w.WriteHeader(resp.StatusCode)
nr, err := io.Copy(w, resp.Body)
if err := resp.Body.Close(); err != nil {
proxyCtx.Logger.Warnf("Can't close response body %v", err)
}
proxyCtx.Logger.Debugf("Copied %v bytes to client error=%v", nr, err)
}
func (proxy *OurProxyHttpServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
proxyCtx := &OurProxyCtx{
Proxy: proxy,
Logger: proxy.Logger,
OrigReq: r,
Req: r,
OrigResp: nil,
Resp: nil,
Session: atomic.AddInt64(&proxy.SessionSerial, 1),
Tr: proxy.Tr,
ResponseFilters: proxy.ResponseFilters,
}
r = r.WithContext(
context.WithValue(
r.Context(),
proxyContextKey,
proxyCtx,
),
)
if r.Method == "CONNECT" {
hij, ok := w.(http.Hijacker)
if !ok {
proxy.Logger.Error("Connection hijacking is not supported")
http.Error(w, "CONNECT not supported", 400)
return
}
proxyClient, _, err := hij.Hijack()
if err != nil {
proxy.Logger.Errorf("Failed to hijack the connection (%s)", err.Error())
http.Error(w, "CONNECT not supported", 400)
return
}
proxyCtx.HandleConnect(r, proxyClient)
} else {
var err error
proxy.Logger.Debugf("Got request %v %v %v %v", r.URL.Path, r.Host, r.Method, r.URL.String())
if !r.URL.IsAbs() {
proxy.HandleNonProxyRequest(w, r)
return
}
r, resp := proxyCtx.FilterRequest(r)
proxyCtx.Req = r
if resp == nil {
removeProxyHeaders(r)
resp, err = proxyCtx.DoRequest(r, w, 0)
if err != nil {
proxyCtx.Logger.Errorf("Error occurred during handling request: %v", err)
proxyCtx.Error = err
resp = proxyCtx.FilterResponse(nil)
if resp == nil {
http.Error(w, err.Error(), 500)
return
}
}
if resp != nil {
proxyCtx.Logger.Debugf("Received response %v", resp.Status)
}
}
proxyCtx.OrigResp = resp
if resp != nil {
resp = proxyCtx.FilterResponse(resp)
resp.ContentLength = -1
if resp.Header != nil {
resp.Header.Del("Content-Length")
}
proxyCtx.Logger.Debugf("Copying response to client %v [%d]", resp.Status, resp.StatusCode)
proxyCtx.SendToClient(w, resp)
} else {
proxyCtx.Logger.Debugf("No response is available")
}
}
}
func buildFakeHTTPSRequestFromHostPortPair(addr string) *http.Request {
return &http.Request{
URL: &url.URL{
Scheme: "https",
Opaque: "",
User: nil,
Host: addr,
Path: "",
RawPath: "",
RawQuery: "",
Fragment: "",
},
}
}
func (proxy *OurProxyHttpServer) doDial(ctx context.Context, addr string) (net.Conn, error) {
if proxy.Tr.DialContext != nil {
return proxy.Tr.DialContext(ctx, "tcp", addr)
}
return (&net.Dialer{}).DialContext(ctx, "tcp", addr)
}
func (proxy *OurProxyHttpServer) doDialTLS(ctx context.Context, addr HostPortPair, tlsConfigTemplate *tls.Config) (net.Conn, error) {
if tlsConfigTemplate == nil {
if proxy.Tr.DialTLS != nil {
return proxy.Tr.DialTLS(ctx, "tcp", addr.String())
}
tlsConfigTemplate = proxy.Tr.TLSClientConfig
}
conn, err := net.Dial("tcp", addr.String())
if err != nil {
return nil, errors.Wrapf(err, "failed to connect to %v", addr)
}
tlsConfig := tlsConfigTemplate.Clone()
tlsConfig.ServerName = addr.Host
return tls.Client(conn, tlsConfig), nil
}
func (proxy *OurProxyHttpServer) ConnectDial(netCtx context.Context, addr string) (net.Conn, error) {
cm, err := proxy.Tr.ConnectMethodForRequest(&httpx.TransportRequest{Request: buildFakeHTTPSRequestFromHostPortPair(addr), Extra: nil})
cm.TargetScheme = "http" // we won't SSL-terminate the connection; packets will be passed through
if err != nil {
return nil, errors.Wrapf(err, "failed to connect to %s", addr)
}
conn, _, _, _, err := proxy.Tr.DoDial(netCtx, cm)
if err != nil {
return nil, errors.Wrapf(err, "failed to connect to %s", addr)
}
return conn, err
}
func FilterRequest(perHostConfig *PerHostConfig, r *http.Request, proxyCtx *OurProxyCtx) (*http.Request, *http.Response) {
newUrlString := ""
headerSets := (http.Header)(nil)
for _, pattern := range perHostConfig.Patterns {
submatchIndexes := pattern.Pattern.FindStringSubmatchIndex(r.URL.Path)
if submatchIndexes != nil {
proxyCtx.Logger.Debugf("%s matched to pattern %s", r.URL.Path, pattern.Pattern.String())
newUrlString = string(pattern.Pattern.ExpandString(
make([]byte, 0, len(pattern.Substitution)+len(r.URL.Path)),
pattern.Substitution,
r.URL.Path,
submatchIndexes,
))
headerSets = make(http.Header)
for headerName, headers := range pattern.Headers {
newHeaders := []string(nil)
if headers != nil {
newHeaders = make([]string, len(headers))
for i, header := range headers {
newHeaders[i] = string(pattern.Pattern.ExpandString(
make([]byte, 0, len(header)+len(r.URL.Path)),
header,
r.URL.Path,
submatchIndexes,
))
}
}
headerSets[textproto.CanonicalMIMEHeaderKey(headerName)] = newHeaders
}
break
}
}
if newUrlString != "" {
newUrl, err := url.Parse(newUrlString)
if err != nil {
proxyCtx.Logger.Error(err)
}
newUrl.User = r.URL.User
if newUrl.RawQuery == "" {
newUrl.RawQuery = r.URL.RawQuery
}
newRequest := r.Clone(r.Context())
newRequest.URL = newUrl
host := headerSets.Get("Host")
if host != "" {
newRequest.Host = host
headerSets.Del("Host")
}
for headerName, headers := range headerSets {
if headers == nil {
delete(newRequest.Header, headerName)
} else {
existingHeaders, ok := newRequest.Header[headerName]
if ok {
headers = append(existingHeaders, headers...)
}
newRequest.Header[headerName] = headers
}
}
proxyCtx.Logger.Infof("%s %s => %s", r.Method, r.RequestURI, newRequest.URL.String())
return newRequest, nil
} else {
proxyCtx.Logger.Infof("%s %s", r.Method, r.RequestURI)
return r, nil
}
}