TLS ECH client: Use chrome-fingerprint and add padding; Add "h2c" and `echSockopt`; Fix some issues (#4949)

Completes https://github.com/XTLS/Xray-core/pull/3813
pull/4970/head
patterniha 2025-08-02 17:47:55 +02:00 committed by RPRX
parent 146b14ab55
commit a02723e63f
7 changed files with 224 additions and 150 deletions

View File

@ -415,6 +415,7 @@ type TLSConfig struct {
ECHServerKeys string `json:"echServerKeys"`
ECHConfigList string `json:"echConfigList"`
ECHForceQuery bool `json:"echForceQuery"`
ECHSocketSettings *SocketConfig `json:"echSockopt"`
}
// Build implements Buildable.
@ -438,7 +439,7 @@ func (c *TLSConfig) Build() (proto.Message, error) {
}
if len(config.NextProtocol) > 1 {
for _, p := range config.NextProtocol {
if tcp.IsFromMitm(p) {
if tls.IsFromMitm(p) {
return nil, errors.New(`only one element is allowed in "alpn" when using "fromMitm" in it`)
}
}
@ -495,6 +496,13 @@ func (c *TLSConfig) Build() (proto.Message, error) {
}
config.EchForceQuery = c.ECHForceQuery
config.EchConfigList = c.ECHConfigList
if c.ECHSocketSettings != nil {
ss, err := c.ECHSocketSettings.Build()
if err != nil {
return nil, errors.New("Failed to build ech sockopt.").Base(err)
}
config.EchSocketSettings = ss
}
return config, nil
}

View File

@ -2,6 +2,7 @@ package tcp
import (
"context"
gotls "crypto/tls"
"slices"
"strings"
@ -15,10 +16,6 @@ import (
"github.com/xtls/xray-core/transport/internet/tls"
)
func IsFromMitm(str string) bool {
return strings.ToLower(str) == "frommitm"
}
// Dial dials a new TCP connection to the given destination.
func Dial(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) (stat.Connection, error) {
errors.LogInfo(ctx, "dialing TCP to ", dest)
@ -30,14 +27,17 @@ func Dial(ctx context.Context, dest net.Destination, streamSettings *internet.Me
if config := tls.ConfigFromStreamSettings(streamSettings); config != nil {
mitmServerName := session.MitmServerNameFromContext(ctx)
mitmAlpn11 := session.MitmAlpn11FromContext(ctx)
tlsConfig := config.GetTLSConfig(tls.WithDestination(dest))
if IsFromMitm(tlsConfig.ServerName) {
tlsConfig.ServerName = mitmServerName
var tlsConfig *gotls.Config
if tls.IsFromMitm(config.ServerName) {
tlsConfig = config.GetTLSConfig(tls.WithOverrideName(mitmServerName))
} else {
tlsConfig = config.GetTLSConfig(tls.WithDestination(dest))
}
isFromMitmVerify := false
if r, ok := tlsConfig.Rand.(*tls.RandCarrier); ok && len(r.VerifyPeerCertInNames) > 0 {
for i, name := range r.VerifyPeerCertInNames {
if IsFromMitm(name) {
if tls.IsFromMitm(name) {
isFromMitmVerify = true
r.VerifyPeerCertInNames[0], r.VerifyPeerCertInNames[i] = r.VerifyPeerCertInNames[i], r.VerifyPeerCertInNames[0]
r.VerifyPeerCertInNames = r.VerifyPeerCertInNames[1:]
@ -56,7 +56,7 @@ func Dial(ctx context.Context, dest net.Destination, streamSettings *internet.Me
}
}
}
isFromMitmAlpn := len(tlsConfig.NextProtos) == 1 && IsFromMitm(tlsConfig.NextProtos[0])
isFromMitmAlpn := len(tlsConfig.NextProtos) == 1 && tls.IsFromMitm(tlsConfig.NextProtos[0])
if isFromMitmAlpn {
if mitmAlpn11 {
tlsConfig.NextProtos[0] = "http/1.1"

View File

@ -8,6 +8,7 @@ import (
"crypto/tls"
"crypto/x509"
"encoding/base64"
"github.com/xtls/xray-core/features/dns"
"os"
"slices"
"strings"
@ -275,6 +276,9 @@ func getNewGetCertificateFunc(certs []*tls.Certificate, rejectUnknownSNI bool) f
}
func (c *Config) parseServerName() string {
if IsFromMitm(c.ServerName) {
return ""
}
return c.ServerName
}
@ -447,7 +451,11 @@ func (c *Config) GetTLSConfig(opts ...Option) *tls.Config {
if len(c.EchConfigList) > 0 || len(c.EchServerKeys) > 0 {
err := ApplyECH(c, config)
if err != nil {
errors.LogError(context.Background(), err)
if c.EchForceQuery || errors.Cause(err) != dns.ErrEmptyResponse {
errors.LogError(context.Background(), err)
} else {
errors.LogInfo(context.Background(), err)
}
}
}
@ -469,6 +477,12 @@ func WithDestination(dest net.Destination) Option {
}
}
func WithOverrideName(serverName string) Option {
return func(config *tls.Config) {
config.ServerName = serverName
}
}
// WithNextProto sets the ALPN values in TLS config.
func WithNextProto(protocol ...string) Option {
return func(config *tls.Config) {
@ -509,3 +523,7 @@ func ParseCurveName(curveNames []string) []tls.CurveID {
}
return curveIDs
}
func IsFromMitm(str string) bool {
return strings.ToLower(str) == "frommitm"
}

View File

@ -7,6 +7,7 @@
package tls
import (
internet "github.com/xtls/xray-core/transport/internet"
protoreflect "google.golang.org/protobuf/reflect/protoreflect"
protoimpl "google.golang.org/protobuf/runtime/protoimpl"
reflect "reflect"
@ -216,10 +217,11 @@ type Config struct {
// @Document Replaces server_name to verify the peer cert.
// @Document After allow_insecure (automatically), if the server's cert can't be verified by any of these names, pinned_peer_certificate_chain_sha256 will be tried.
// @Critical
VerifyPeerCertInNames []string `protobuf:"bytes,17,rep,name=verify_peer_cert_in_names,json=verifyPeerCertInNames,proto3" json:"verify_peer_cert_in_names,omitempty"`
EchServerKeys []byte `protobuf:"bytes,18,opt,name=ech_server_keys,json=echServerKeys,proto3" json:"ech_server_keys,omitempty"`
EchConfigList string `protobuf:"bytes,19,opt,name=ech_config_list,json=echConfigList,proto3" json:"ech_config_list,omitempty"`
EchForceQuery bool `protobuf:"varint,20,opt,name=ech_force_query,json=echForceQuery,proto3" json:"ech_force_query,omitempty"`
VerifyPeerCertInNames []string `protobuf:"bytes,17,rep,name=verify_peer_cert_in_names,json=verifyPeerCertInNames,proto3" json:"verify_peer_cert_in_names,omitempty"`
EchServerKeys []byte `protobuf:"bytes,18,opt,name=ech_server_keys,json=echServerKeys,proto3" json:"ech_server_keys,omitempty"`
EchConfigList string `protobuf:"bytes,19,opt,name=ech_config_list,json=echConfigList,proto3" json:"ech_config_list,omitempty"`
EchForceQuery bool `protobuf:"varint,20,opt,name=ech_force_query,json=echForceQuery,proto3" json:"ech_force_query,omitempty"`
EchSocketSettings *internet.SocketConfig `protobuf:"bytes,21,opt,name=ech_socket_settings,json=echSocketSettings,proto3" json:"ech_socket_settings,omitempty"`
}
func (x *Config) Reset() {
@ -385,6 +387,13 @@ func (x *Config) GetEchForceQuery() bool {
return false
}
func (x *Config) GetEchSocketSettings() *internet.SocketConfig {
if x != nil {
return x.EchSocketSettings
}
return nil
}
var File_transport_internet_tls_config_proto protoreflect.FileDescriptor
var file_transport_internet_tls_config_proto_rawDesc = []byte{
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}
var (
@ -499,18 +516,20 @@ func file_transport_internet_tls_config_proto_rawDescGZIP() []byte {
var file_transport_internet_tls_config_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
var file_transport_internet_tls_config_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
var file_transport_internet_tls_config_proto_goTypes = []any{
(Certificate_Usage)(0), // 0: xray.transport.internet.tls.Certificate.Usage
(*Certificate)(nil), // 1: xray.transport.internet.tls.Certificate
(*Config)(nil), // 2: xray.transport.internet.tls.Config
(Certificate_Usage)(0), // 0: xray.transport.internet.tls.Certificate.Usage
(*Certificate)(nil), // 1: xray.transport.internet.tls.Certificate
(*Config)(nil), // 2: xray.transport.internet.tls.Config
(*internet.SocketConfig)(nil), // 3: xray.transport.internet.SocketConfig
}
var file_transport_internet_tls_config_proto_depIdxs = []int32{
0, // 0: xray.transport.internet.tls.Certificate.usage:type_name -> xray.transport.internet.tls.Certificate.Usage
1, // 1: xray.transport.internet.tls.Config.certificate:type_name -> xray.transport.internet.tls.Certificate
2, // [2:2] is the sub-list for method output_type
2, // [2:2] is the sub-list for method input_type
2, // [2:2] is the sub-list for extension type_name
2, // [2:2] is the sub-list for extension extendee
0, // [0:2] is the sub-list for field type_name
3, // 2: xray.transport.internet.tls.Config.ech_socket_settings:type_name -> xray.transport.internet.SocketConfig
3, // [3:3] is the sub-list for method output_type
3, // [3:3] is the sub-list for method input_type
3, // [3:3] is the sub-list for extension type_name
3, // [3:3] is the sub-list for extension extendee
0, // [0:3] is the sub-list for field type_name
}
func init() { file_transport_internet_tls_config_proto_init() }

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@ -6,6 +6,8 @@ option go_package = "github.com/xtls/xray-core/transport/internet/tls";
option java_package = "com.xray.transport.internet.tls";
option java_multiple_files = true;
import "transport/internet/config.proto";
message Certificate {
// TLS certificate in x509 format.
bytes certificate = 1;
@ -97,4 +99,6 @@ message Config {
string ech_config_list = 19;
bool ech_force_query = 20;
}
SocketConfig ech_socket_settings = 21;
}

View File

@ -8,8 +8,14 @@ import (
"crypto/tls"
"encoding/base64"
"encoding/binary"
"fmt"
utls "github.com/refraction-networking/utls"
"github.com/xtls/xray-core/common/crypto"
dns2 "github.com/xtls/xray-core/features/dns"
"golang.org/x/net/http2"
"io"
"net/http"
"net/url"
"strings"
"sync"
"sync/atomic"
@ -29,7 +35,10 @@ func ApplyECH(c *Config, config *tls.Config) error {
var ECHConfig []byte
var err error
nameToQuery := c.ServerName
var nameToQuery string
if net.ParseAddress(config.ServerName).Family().IsDomain() {
nameToQuery = config.ServerName
}
var DNSServer string
// for server
@ -69,9 +78,9 @@ func ApplyECH(c *Config, config *tls.Config) error {
if nameToQuery == "" {
return errors.New("Using DNS for ECH Config needs serverName or use Server format example.com+https://1.1.1.1/dns-query")
}
ECHConfig, err = QueryRecord(nameToQuery, DNSServer, c.EchForceQuery)
ECHConfig, err = QueryRecord(nameToQuery, DNSServer, c.EchForceQuery, c.EchSocketSettings)
if err != nil {
return err
return errors.New("Failed to query ECH DNS record for domain: ", nameToQuery, " at server: ", DNSServer).Base(err)
}
} else {
ECHConfig, err = base64.StdEncoding.DecodeString(c.EchConfigList)
@ -105,7 +114,7 @@ var (
// Update updates the ECH config for given domain and server.
// this method is concurrent safe, only one update request will be sent, others get the cache.
// if isLockedUpdate is true, it will not try to acquire the lock.
func (c *ECHConfigCache) Update(domain string, server string, forceQuery bool, isLockedUpdate bool) ([]byte, error) {
func (c *ECHConfigCache) Update(domain string, server string, isLockedUpdate bool, forceQuery bool, sockopt *internet.SocketConfig) ([]byte, error) {
if !isLockedUpdate {
c.UpdateLock.Lock()
defer c.UpdateLock.Unlock()
@ -118,32 +127,25 @@ func (c *ECHConfigCache) Update(domain string, server string, forceQuery bool, i
}
// Query ECH config from DNS server
errors.LogDebug(context.Background(), "Trying to query ECH config for domain: ", domain, " with ECH server: ", server)
echConfig, ttl, err := dnsQuery(server, domain)
echConfig, ttl, err := dnsQuery(server, domain, sockopt)
if err != nil {
if forceQuery {
if forceQuery || ttl == 0 {
return nil, err
} else {
configRecord = &echConfigRecord{
config: nil,
expire: time.Now().Add(10 * time.Minute),
err: err,
}
c.configRecord.Store(configRecord)
return echConfig, err
}
}
configRecord = &echConfigRecord{
config: echConfig,
expire: time.Now().Add(time.Duration(ttl) * time.Second),
err: err,
}
c.configRecord.Store(configRecord)
return configRecord.config, nil
return configRecord.config, configRecord.err
}
// QueryRecord returns the ECH config for given domain.
// If the record is not in cache or expired, it will query the DNS server and update the cache.
func QueryRecord(domain string, server string, forceQuery bool) ([]byte, error) {
GlobalECHConfigCacheKey := domain + "|" + server
func QueryRecord(domain string, server string, forceQuery bool, sockopt *internet.SocketConfig) ([]byte, error) {
GlobalECHConfigCacheKey := domain + "|" + server + "|" + fmt.Sprintf("%p", sockopt)
echConfigCache, ok := GlobalECHConfigCache.Load(GlobalECHConfigCacheKey)
if !ok {
echConfigCache = &ECHConfigCache{}
@ -160,27 +162,33 @@ func QueryRecord(domain string, server string, forceQuery bool) ([]byte, error)
// otherwise return old value immediately and update in a goroutine
// but if the cache is too old, wait for update
if configRecord.expire == (time.Time{}) || configRecord.expire.Add(time.Hour*6).Before(time.Now()) {
return echConfigCache.Update(domain, server, false, forceQuery)
return echConfigCache.Update(domain, server, false, forceQuery, sockopt)
} else {
// If someone already acquired the lock, it means it is updating, do not start another update goroutine
if echConfigCache.UpdateLock.TryLock() {
go func() {
defer echConfigCache.UpdateLock.Unlock()
echConfigCache.Update(domain, server, true, forceQuery)
echConfigCache.Update(domain, server, true, forceQuery, sockopt)
}()
}
return configRecord.config, nil
return configRecord.config, configRecord.err
}
}
// dnsQuery is the real func for sending type65 query for given domain to given DNS server.
// return ECH config, TTL and error
func dnsQuery(server string, domain string) ([]byte, uint32, error) {
func dnsQuery(server string, domain string, sockopt *internet.SocketConfig) ([]byte, uint32, error) {
m := new(dns.Msg)
var dnsResolve []byte
m.SetQuestion(dns.Fqdn(domain), dns.TypeHTTPS)
// for DOH server
if strings.HasPrefix(server, "https://") {
if strings.HasPrefix(server, "https://") || strings.HasPrefix(server, "h2c://") {
h2c := strings.HasPrefix(server, "h2c://")
m.SetEdns0(4096, false) // 4096 is the buffer size, false means no DNSSEC
padding := &dns.EDNS0_PADDING{Padding: make([]byte, int(crypto.RandBetween(100, 300)))}
if opt := m.IsEdns0(); opt != nil {
opt.Option = append(opt.Option, padding)
}
// always 0 in DOH
m.Id = 0
msg, err := m.Pack()
@ -188,21 +196,35 @@ func dnsQuery(server string, domain string) ([]byte, uint32, error) {
return nil, 0, err
}
var client *http.Client
if client, _ = clientForECHDOH.Load(server); client == nil {
serverKey := server + "|" + fmt.Sprintf("%p", sockopt)
if client, _ = clientForECHDOH.Load(serverKey); client == nil {
// All traffic sent by core should via xray's internet.DialSystem
// This involves the behavior of some Android VPN GUI clients
tr := &http.Transport{
IdleConnTimeout: 90 * time.Second,
ForceAttemptHTTP2: true,
DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
tr := &http2.Transport{
IdleConnTimeout: net.ConnIdleTimeout,
ReadIdleTimeout: net.ChromeH2KeepAlivePeriod,
DialTLSContext: func(ctx context.Context, network, addr string, cfg *tls.Config) (net.Conn, error) {
dest, err := net.ParseDestination(network + ":" + addr)
if err != nil {
return nil, err
}
conn, err := internet.DialSystem(ctx, dest, nil)
var conn net.Conn
conn, err = internet.DialSystem(ctx, dest, sockopt)
if err != nil {
return nil, err
}
if !h2c {
u, err := url.Parse(server)
if err != nil {
return nil, err
}
conn = utls.UClient(conn, &utls.Config{ServerName: u.Hostname()}, utls.HelloChrome_Auto)
if err := conn.(*utls.UConn).HandshakeContext(ctx); err != nil {
return nil, err
}
}
return conn, nil
},
}
@ -210,13 +232,15 @@ func dnsQuery(server string, domain string) ([]byte, uint32, error) {
Timeout: 5 * time.Second,
Transport: tr,
}
client, _ = clientForECHDOH.LoadOrStore(server, c)
client, _ = clientForECHDOH.LoadOrStore(serverKey, c)
}
req, err := http.NewRequest("POST", server, bytes.NewReader(msg))
if err != nil {
return nil, 0, err
}
req.Header.Set("Accept", "application/dns-message")
req.Header.Set("Content-Type", "application/dns-message")
req.Header.Set("X-Padding", strings.Repeat("X", int(crypto.RandBetween(100, 1000))))
resp, err := client.Do(req)
if err != nil {
return nil, 0, err
@ -243,16 +267,16 @@ func dnsQuery(server string, domain string) ([]byte, uint32, error) {
dnsTimeoutCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
// use xray's internet.DialSystem as mentioned above
conn, err := internet.DialSystem(dnsTimeoutCtx, dest, nil)
conn, err := internet.DialSystem(dnsTimeoutCtx, dest, sockopt)
if err != nil {
return nil, 0, err
}
defer func() {
err := conn.Close()
if err != nil {
errors.LogDebug(context.Background(), "Failed to close connection: ", err)
}
}()
if err != nil {
return nil, 0, err
}
msg, err := m.Pack()
if err != nil {
return nil, 0, err
@ -283,7 +307,7 @@ func dnsQuery(server string, domain string) ([]byte, uint32, error) {
}
}
}
return nil, 0, errors.New("no ech record found")
return nil, dns2.DefaultTTL, dns2.ErrEmptyResponse
}
// reference github.com/OmarTariq612/goech

View File

@ -1,6 +1,7 @@
package tls
import (
"fmt"
"io"
"net/http"
"strings"
@ -40,7 +41,7 @@ func TestECHDial(t *testing.T) {
}
wg.Wait()
// check cache
echConfigCache, ok := GlobalECHConfigCache.Load("encryptedsni.com|udp://1.1.1.1")
echConfigCache, ok := GlobalECHConfigCache.Load("encryptedsni.com|udp://1.1.1.1" + "|" + fmt.Sprintf("%p", config.EchSocketSettings))
if !ok {
t.Error("ECH config cache not found")
@ -74,7 +75,7 @@ func TestECHDialFail(t *testing.T) {
_, err = io.ReadAll(resp.Body)
common.Must(err)
// check cache
echConfigCache, ok := GlobalECHConfigCache.Load("cloudflare.com|udp://1.1.1.1")
echConfigCache, ok := GlobalECHConfigCache.Load("cloudflare.com|udp://1.1.1.1" + "|" + fmt.Sprintf("%p", config.EchSocketSettings))
if !ok {
t.Error("ECH config cache not found")
}