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ECH: client support TLS Encrypted Client Hello

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风扇滑翔翼 2025-02-08 10:07:42 +00:00 committed by GitHub
parent db5f18b98c
commit 6f84e7dfe5
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GPG Key ID: B5690EEEBB952194
5 changed files with 190 additions and 10 deletions
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11
infra/conf/transport_internet.go
View File

@ -412,6 +412,8 @@ type TLSConfig struct {
MasterKeyLog string `json:"masterKeyLog"`
ServerNameToVerify string `json:"serverNameToVerify"`
VerifyPeerCertInNames []string `json:"verifyPeerCertInNames"`
ECHConfig string `json:"echConfig"`
ECHDOHServer string `json:"echDohServer"`
}
// Build implements Buildable.
@ -476,6 +478,15 @@ func (c *TLSConfig) Build() (proto.Message, error) {
}
config.VerifyPeerCertInNames = c.VerifyPeerCertInNames
if c.ECHConfig != "" {
ECHConfig, err := base64.StdEncoding.DecodeString(c.ECHConfig)
if err != nil {
return nil, errors.New("invalid ECH Config", c.ECHConfig)
}
config.EchConfig = ECHConfig
}
config.Ech_DOHserver = c.ECHDOHServer
return config, nil
}

6
transport/internet/tls/config.go
View File

@ -444,6 +444,12 @@ func (c *Config) GetTLSConfig(opts ...Option) *tls.Config {
config.KeyLogWriter = writer
}
}
if len(c.EchConfig) > 0 || len(c.Ech_DOHserver) > 0 {
err := ApplyECH(c, config)
if err != nil {
errors.LogError(context.Background(), err)
}
}
return config
}

40
transport/internet/tls/config.pb.go
View File

@ -217,6 +217,8 @@ type Config struct {
// @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"`
EchConfig []byte `protobuf:"bytes,20,opt,name=ech_config,json=echConfig,proto3" json:"ech_config,omitempty"`
Ech_DOHserver string `protobuf:"bytes,21,opt,name=ech_DOHserver,json=echDOHserver,proto3" json:"ech_DOHserver,omitempty"`
}
func (x *Config) Reset() {
@ -361,6 +363,20 @@ func (x *Config) GetVerifyPeerCertInNames() []string {
return nil
}
func (x *Config) GetEchConfig() []byte {
if x != nil {
return x.EchConfig
}
return nil
}
func (x *Config) GetEch_DOHserver() string {
if x != nil {
return x.Ech_DOHserver
}
return ""
}
var File_transport_internet_tls_config_proto protoreflect.FileDescriptor
var file_transport_internet_tls_config_proto_rawDesc = []byte{
@ -392,7 +408,7 @@ var file_transport_internet_tls_config_proto_rawDesc = []byte{
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@ -442,15 +458,19 @@ var file_transport_internet_tls_config_proto_rawDesc = []byte{
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}
var (

6
transport/internet/tls/config.proto
View File

@ -91,4 +91,10 @@ message Config {
@Critical
*/
repeated string verify_peer_cert_in_names = 17;
bytes ech_config = 20;
string ech_DOHserver = 21;
}

137
transport/internet/tls/ech.go Normal file
View File

@ -0,0 +1,137 @@
package tls
import (
"bytes"
"context"
"crypto/tls"
"io"
"net/http"
"sync"
"time"
"github.com/miekg/dns"
"github.com/xtls/xray-core/common/errors"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/transport/internet"
)
func ApplyECH(c *Config, config *tls.Config) error {
var ECHConfig []byte
var err error
if len(c.EchConfig) > 0 {
ECHConfig = c.EchConfig
} else { // ECH config > DOH lookup
if config.ServerName == "" {
return errors.New("Using DOH for ECH needs serverName")
}
ECHConfig, err = QueryRecord(c.ServerName, c.Ech_DOHserver)
if err != nil {
return err
}
}
config.EncryptedClientHelloConfigList = ECHConfig
return nil
}
type record struct {
record []byte
expire time.Time
}
var (
dnsCache = make(map[string]record)
mutex sync.RWMutex
)
func QueryRecord(domain string, server string) ([]byte, error) {
mutex.Lock()
rec, found := dnsCache[domain]
if found && rec.expire.After(time.Now()) {
mutex.Unlock()
return rec.record, nil
}
mutex.Unlock()
errors.LogDebug(context.Background(), "Trying to query ECH config for domain: ", domain, " with ECH server: ", server)
record, ttl, err := dohQuery(server, domain)
if err != nil {
return []byte{}, err
}
if ttl < 600 {
ttl = 600
}
mutex.Lock()
defer mutex.Unlock()
rec.record = record
rec.expire = time.Now().Add(time.Second * time.Duration(ttl))
dnsCache[domain] = rec
return record, nil
}
func dohQuery(server string, domain string) ([]byte, uint32, error) {
m := new(dns.Msg)
m.SetQuestion(dns.Fqdn(domain), dns.TypeHTTPS)
m.Id = 0
msg, err := m.Pack()
if err != nil {
return []byte{}, 0, err
}
tr := &http.Transport{
IdleConnTimeout: 90 * time.Second,
ForceAttemptHTTP2: true,
DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
dest, err := net.ParseDestination(network + ":" + addr)
if err != nil {
return nil, err
}
conn, err := internet.DialSystem(ctx, dest, nil)
if err != nil {
return nil, err
}
return conn, nil
},
}
client := &http.Client{
Timeout: 5 * time.Second,
Transport: tr,
}
req, err := http.NewRequest("POST", server, bytes.NewReader(msg))
if err != nil {
return []byte{}, 0, err
}
req.Header.Set("Content-Type", "application/dns-message")
resp, err := client.Do(req)
if err != nil {
return []byte{}, 0, err
}
defer resp.Body.Close()
respBody, err := io.ReadAll(resp.Body)
if err != nil {
return []byte{}, 0, err
}
if resp.StatusCode != http.StatusOK {
return []byte{}, 0, errors.New("query failed with response code:", resp.StatusCode)
}
respMsg := new(dns.Msg)
err = respMsg.Unpack(respBody)
if err != nil {
return []byte{}, 0, err
}
if len(respMsg.Answer) > 0 {
for _, answer := range respMsg.Answer {
if https, ok := answer.(*dns.HTTPS); ok && https.Hdr.Name == dns.Fqdn(domain) {
for _, v := range https.Value {
if echConfig, ok := v.(*dns.SVCBECHConfig); ok {
errors.LogDebug(context.Background(), "Get ECH config:", echConfig.String(), " TTL:", respMsg.Answer[0].Header().Ttl)
return echConfig.ECH, answer.Header().Ttl, nil
}
}
}
}
}
return []byte{}, 0, errors.New("no ech record found")
}