mirror of
https://github.com/XTLS/Xray-core.git
synced 2024-11-25 18:11:27 +00:00
348 lines
9.9 KiB
Go
348 lines
9.9 KiB
Go
package http
|
|
|
|
import (
|
|
"bufio"
|
|
"bytes"
|
|
"context"
|
|
"encoding/base64"
|
|
"io"
|
|
"net/http"
|
|
"strings"
|
|
"time"
|
|
|
|
"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/stat"
|
|
)
|
|
|
|
// 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 stat.Connection, dispatcher routing.Dispatcher) error {
|
|
return s.ProcessWithFirstbyte(ctx, network, conn, dispatcher)
|
|
}
|
|
|
|
// Firstbyte is for forwarded conn from SOCKS inbound
|
|
// Because it needs first byte to choose protocol
|
|
// We need to add it back
|
|
// Other parts are the same as the process function
|
|
func (s *Server) ProcessWithFirstbyte(ctx context.Context, network net.Network, conn stat.Connection, dispatcher routing.Dispatcher, firstbyte ...byte) error {
|
|
inbound := session.InboundFromContext(ctx)
|
|
inbound.Name = "http"
|
|
inbound.CanSpliceCopy = 2
|
|
inbound.User = &protocol.MemoryUser{
|
|
Level: s.config.UserLevel,
|
|
}
|
|
var reader *bufio.Reader
|
|
if len(firstbyte) > 0 {
|
|
readerWithoutFirstbyte := bufio.NewReaderSize(readerOnly{conn}, buf.Size)
|
|
multiReader := io.MultiReader(bytes.NewReader(firstbyte), readerWithoutFirstbyte)
|
|
reader = bufio.NewReaderSize(multiReader, buf.Size)
|
|
} else {
|
|
reader = bufio.NewReaderSize(readerOnly{conn}, buf.Size)
|
|
}
|
|
|
|
Start:
|
|
if err := conn.SetReadDeadline(time.Now().Add(s.policy().Timeouts.Handshake)); err != nil {
|
|
errors.LogInfoInner(ctx, err, "failed to set read deadline")
|
|
}
|
|
|
|
request, err := http.ReadRequest(reader)
|
|
if err != nil {
|
|
trace := errors.New("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
|
|
}
|
|
}
|
|
|
|
errors.LogInfo(ctx, "request to Method [", request.Method, "] Host [", request.Host, "] with URL [", request.URL, "]")
|
|
if err := conn.SetReadDeadline(time.Time{}); err != nil {
|
|
errors.LogDebugInner(ctx, err, "failed to clear read deadline")
|
|
}
|
|
|
|
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 errors.New("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, inbound)
|
|
}
|
|
|
|
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 stat.Connection, dest net.Destination, dispatcher routing.Dispatcher, inbound *session.Inbound) error {
|
|
_, err := conn.Write([]byte("HTTP/1.1 200 Connection established\r\n\r\n"))
|
|
if err != nil {
|
|
return errors.New("failed to write back OK response").Base(err)
|
|
}
|
|
|
|
plcy := s.policy()
|
|
ctx, cancel := context.WithCancel(ctx)
|
|
timer := signal.CancelAfterInactivity(ctx, cancel, plcy.Timeouts.ConnectionIdle)
|
|
|
|
if inbound != nil {
|
|
inbound.Timer = timer
|
|
}
|
|
|
|
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
|
|
}
|
|
|
|
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 errors.New("connection ends").Base(err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
var errWaitAnother = errors.New("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 errors.New("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
|
|
}
|
|
defer response.Body.Close()
|
|
} else {
|
|
errors.LogWarningInner(ctx, err, "failed to read response from ", request.Host)
|
|
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 errors.New("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 errors.New("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))
|
|
}))
|
|
}
|