Xray-core/proxy/http/server.go

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2020-11-25 11:01:53 +00:00
// +build !confonly
package http
import (
"bufio"
"context"
"encoding/base64"
"io"
"net/http"
"strings"
"time"
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"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/buf"
"github.com/xtls/xray-core/common/errors"
"github.com/xtls/xray-core/common/log"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/protocol"
http_proto "github.com/xtls/xray-core/common/protocol/http"
"github.com/xtls/xray-core/common/session"
"github.com/xtls/xray-core/common/signal"
"github.com/xtls/xray-core/common/task"
"github.com/xtls/xray-core/core"
"github.com/xtls/xray-core/features/policy"
"github.com/xtls/xray-core/features/routing"
"github.com/xtls/xray-core/transport/internet"
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)
// Server is an HTTP proxy server.
type Server struct {
config *ServerConfig
policyManager policy.Manager
}
// NewServer creates a new HTTP inbound handler.
func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) {
v := core.MustFromContext(ctx)
s := &Server{
config: config,
policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
}
return s, nil
}
func (s *Server) policy() policy.Session {
config := s.config
p := s.policyManager.ForLevel(config.UserLevel)
if config.Timeout > 0 && config.UserLevel == 0 {
p.Timeouts.ConnectionIdle = time.Duration(config.Timeout) * time.Second
}
return p
}
// Network implements proxy.Inbound.
func (*Server) Network() []net.Network {
return []net.Network{net.Network_TCP, net.Network_UNIX}
}
func isTimeout(err error) bool {
nerr, ok := errors.Cause(err).(net.Error)
return ok && nerr.Timeout()
}
func parseBasicAuth(auth string) (username, password string, ok bool) {
const prefix = "Basic "
if !strings.HasPrefix(auth, prefix) {
return
}
c, err := base64.StdEncoding.DecodeString(auth[len(prefix):])
if err != nil {
return
}
cs := string(c)
s := strings.IndexByte(cs, ':')
if s < 0 {
return
}
return cs[:s], cs[s+1:], true
}
type readerOnly struct {
io.Reader
}
func (s *Server) Process(ctx context.Context, network net.Network, conn internet.Connection, dispatcher routing.Dispatcher) error {
inbound := session.InboundFromContext(ctx)
if inbound != nil {
inbound.User = &protocol.MemoryUser{
Level: s.config.UserLevel,
}
}
reader := bufio.NewReaderSize(readerOnly{conn}, buf.Size)
Start:
if err := conn.SetReadDeadline(time.Now().Add(s.policy().Timeouts.Handshake)); err != nil {
newError("failed to set read deadline").Base(err).WriteToLog(session.ExportIDToError(ctx))
}
request, err := http.ReadRequest(reader)
if err != nil {
trace := newError("failed to read http request").Base(err)
if errors.Cause(err) != io.EOF && !isTimeout(errors.Cause(err)) {
trace.AtWarning()
}
return trace
}
if len(s.config.Accounts) > 0 {
user, pass, ok := parseBasicAuth(request.Header.Get("Proxy-Authorization"))
if !ok || !s.config.HasAccount(user, pass) {
return common.Error2(conn.Write([]byte("HTTP/1.1 407 Proxy Authentication Required\r\nProxy-Authenticate: Basic realm=\"proxy\"\r\n\r\n")))
}
if inbound != nil {
inbound.User.Email = user
}
}
newError("request to Method [", request.Method, "] Host [", request.Host, "] with URL [", request.URL, "]").WriteToLog(session.ExportIDToError(ctx))
if err := conn.SetReadDeadline(time.Time{}); err != nil {
newError("failed to clear read deadline").Base(err).WriteToLog(session.ExportIDToError(ctx))
}
defaultPort := net.Port(80)
if strings.EqualFold(request.URL.Scheme, "https") {
defaultPort = net.Port(443)
}
host := request.Host
if host == "" {
host = request.URL.Host
}
dest, err := http_proto.ParseHost(host, defaultPort)
if err != nil {
return newError("malformed proxy host: ", host).AtWarning().Base(err)
}
ctx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{
From: conn.RemoteAddr(),
To: request.URL,
Status: log.AccessAccepted,
Reason: "",
})
if strings.EqualFold(request.Method, "CONNECT") {
return s.handleConnect(ctx, request, reader, conn, dest, dispatcher)
}
keepAlive := (strings.TrimSpace(strings.ToLower(request.Header.Get("Proxy-Connection"))) == "keep-alive")
err = s.handlePlainHTTP(ctx, request, conn, dest, dispatcher)
if err == errWaitAnother {
if keepAlive {
goto Start
}
err = nil
}
return err
}
func (s *Server) handleConnect(ctx context.Context, _ *http.Request, reader *bufio.Reader, conn internet.Connection, dest net.Destination, dispatcher routing.Dispatcher) error {
_, err := conn.Write([]byte("HTTP/1.1 200 Connection established\r\n\r\n"))
if err != nil {
return newError("failed to write back OK response").Base(err)
}
plcy := s.policy()
ctx, cancel := context.WithCancel(ctx)
timer := signal.CancelAfterInactivity(ctx, cancel, plcy.Timeouts.ConnectionIdle)
ctx = policy.ContextWithBufferPolicy(ctx, plcy.Buffer)
link, err := dispatcher.Dispatch(ctx, dest)
if err != nil {
return err
}
if reader.Buffered() > 0 {
payload, err := buf.ReadFrom(io.LimitReader(reader, int64(reader.Buffered())))
if err != nil {
return err
}
if err := link.Writer.WriteMultiBuffer(payload); err != nil {
return err
}
reader = nil
}
requestDone := func() error {
defer timer.SetTimeout(plcy.Timeouts.DownlinkOnly)
return buf.Copy(buf.NewReader(conn), link.Writer, buf.UpdateActivity(timer))
}
responseDone := func() error {
defer timer.SetTimeout(plcy.Timeouts.UplinkOnly)
v2writer := buf.NewWriter(conn)
if err := buf.Copy(link.Reader, v2writer, buf.UpdateActivity(timer)); err != nil {
return err
}
return nil
}
var closeWriter = task.OnSuccess(requestDone, task.Close(link.Writer))
if err := task.Run(ctx, closeWriter, responseDone); err != nil {
common.Interrupt(link.Reader)
common.Interrupt(link.Writer)
return newError("connection ends").Base(err)
}
return nil
}
var errWaitAnother = newError("keep alive")
func (s *Server) handlePlainHTTP(ctx context.Context, request *http.Request, writer io.Writer, dest net.Destination, dispatcher routing.Dispatcher) error {
if !s.config.AllowTransparent && request.URL.Host == "" {
// RFC 2068 (HTTP/1.1) requires URL to be absolute URL in HTTP proxy.
response := &http.Response{
Status: "Bad Request",
StatusCode: 400,
Proto: "HTTP/1.1",
ProtoMajor: 1,
ProtoMinor: 1,
Header: http.Header(make(map[string][]string)),
Body: nil,
ContentLength: 0,
Close: true,
}
response.Header.Set("Proxy-Connection", "close")
response.Header.Set("Connection", "close")
return response.Write(writer)
}
if len(request.URL.Host) > 0 {
request.Host = request.URL.Host
}
http_proto.RemoveHopByHopHeaders(request.Header)
// Prevent UA from being set to golang's default ones
if request.Header.Get("User-Agent") == "" {
request.Header.Set("User-Agent", "")
}
content := &session.Content{
Protocol: "http/1.1",
}
content.SetAttribute(":method", strings.ToUpper(request.Method))
content.SetAttribute(":path", request.URL.Path)
for key := range request.Header {
value := request.Header.Get(key)
content.SetAttribute(strings.ToLower(key), value)
}
ctx = session.ContextWithContent(ctx, content)
link, err := dispatcher.Dispatch(ctx, dest)
if err != nil {
return err
}
// Plain HTTP request is not a stream. The request always finishes before response. Hense request has to be closed later.
defer common.Close(link.Writer)
var result error = errWaitAnother
requestDone := func() error {
request.Header.Set("Connection", "close")
requestWriter := buf.NewBufferedWriter(link.Writer)
common.Must(requestWriter.SetBuffered(false))
if err := request.Write(requestWriter); err != nil {
return newError("failed to write whole request").Base(err).AtWarning()
}
return nil
}
responseDone := func() error {
responseReader := bufio.NewReaderSize(&buf.BufferedReader{Reader: link.Reader}, buf.Size)
response, err := http.ReadResponse(responseReader, request)
if err == nil {
http_proto.RemoveHopByHopHeaders(response.Header)
if response.ContentLength >= 0 {
response.Header.Set("Proxy-Connection", "keep-alive")
response.Header.Set("Connection", "keep-alive")
response.Header.Set("Keep-Alive", "timeout=4")
response.Close = false
} else {
response.Close = true
result = nil
}
} else {
newError("failed to read response from ", request.Host).Base(err).AtWarning().WriteToLog(session.ExportIDToError(ctx))
response = &http.Response{
Status: "Service Unavailable",
StatusCode: 503,
Proto: "HTTP/1.1",
ProtoMajor: 1,
ProtoMinor: 1,
Header: http.Header(make(map[string][]string)),
Body: nil,
ContentLength: 0,
Close: true,
}
response.Header.Set("Connection", "close")
response.Header.Set("Proxy-Connection", "close")
}
if err := response.Write(writer); err != nil {
return newError("failed to write response").Base(err).AtWarning()
}
return nil
}
if err := task.Run(ctx, requestDone, responseDone); err != nil {
common.Interrupt(link.Reader)
common.Interrupt(link.Writer)
return newError("connection ends").Base(err)
}
return result
}
func init() {
common.Must(common.RegisterConfig((*ServerConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
return NewServer(ctx, config.(*ServerConfig))
}))
}