diff --git a/app/dns/config.pb.go b/app/dns/config.pb.go index 05fd6099b387..241db2a7c0ea 100644 --- a/app/dns/config.pb.go +++ b/app/dns/config.pb.go @@ -135,6 +135,7 @@ type NameServer struct { Geoip []*router.GeoIP `protobuf:"bytes,3,rep,name=geoip,proto3" json:"geoip,omitempty"` OriginalRules []*NameServer_OriginalRule `protobuf:"bytes,4,rep,name=original_rules,json=originalRules,proto3" json:"original_rules,omitempty"` QueryStrategy QueryStrategy `protobuf:"varint,7,opt,name=query_strategy,json=queryStrategy,proto3,enum=xray.app.dns.QueryStrategy" json:"query_strategy,omitempty"` + FakeSni string `protobuf:"bytes,8,opt,name=fake_sni,json=fakeSni,proto3" json:"fake_sni,omitempty"` } func (x *NameServer) Reset() { @@ -216,6 +217,13 @@ func (x *NameServer) GetQueryStrategy() QueryStrategy { return QueryStrategy_USE_IP } +func (x *NameServer) GetFakeSni() string { + if x != nil { + return x.FakeSni + } + return "" +} + type Config struct { state protoimpl.MessageState sizeCache 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100644 --- a/app/dns/nameserver.go +++ b/app/dns/nameserver.go @@ -35,7 +35,7 @@ type Client struct { var errExpectedIPNonMatch = errors.New("expectIPs not match") // NewServer creates a name server object according to the network destination url. -func NewServer(ctx context.Context, dest net.Destination, dispatcher routing.Dispatcher, queryStrategy QueryStrategy) (Server, error) { +func NewServer(ctx context.Context, dest net.Destination, dispatcher routing.Dispatcher, queryStrategy QueryStrategy, fakeSNI string) (Server, error) { if address := dest.Address; address.Family().IsDomain() { u, err := url.Parse(address.Domain()) if err != nil { @@ -47,7 +47,7 @@ func NewServer(ctx context.Context, dest net.Destination, dispatcher routing.Dis case strings.EqualFold(u.Scheme, "https"): // DOH Remote mode return NewDoHNameServer(u, dispatcher, queryStrategy) case strings.EqualFold(u.Scheme, "https+local"): // DOH Local mode - return NewDoHLocalNameServer(u, queryStrategy), nil + return NewDoHLocalNameServer(u, queryStrategy, fakeSNI), nil case strings.EqualFold(u.Scheme, "quic+local"): // DNS-over-QUIC Local mode return NewQUICNameServer(u, queryStrategy) case strings.EqualFold(u.Scheme, "tcp"): // DNS-over-TCP Remote mode @@ -84,7 +84,7 @@ func NewClient( err := core.RequireFeatures(ctx, func(dispatcher routing.Dispatcher) error { // Create a new server for each client for now - server, err := NewServer(ctx, ns.Address.AsDestination(), dispatcher, ns.GetQueryStrategy()) + server, err := NewServer(ctx, ns.Address.AsDestination(), dispatcher, ns.GetQueryStrategy(), ns.FakeSni) if err != nil { return errors.New("failed to create nameserver").Base(err).AtWarning() } diff --git a/app/dns/nameserver_doh.go b/app/dns/nameserver_doh.go index 7c25bb8d8ac2..11b2d264e100 100644 --- a/app/dns/nameserver_doh.go +++ b/app/dns/nameserver_doh.go @@ -10,6 +10,7 @@ import ( "sync" "time" + utls "github.com/refraction-networking/utls" "github.com/xtls/xray-core/common" "github.com/xtls/xray-core/common/errors" "github.com/xtls/xray-core/common/log" @@ -90,13 +91,16 @@ func NewDoHNameServer(url *url.URL, dispatcher routing.Dispatcher, queryStrategy } // NewDoHLocalNameServer creates DOH client object for local resolving -func NewDoHLocalNameServer(url *url.URL, queryStrategy QueryStrategy) *DoHNameServer { +func NewDoHLocalNameServer(url *url.URL, queryStrategy QueryStrategy, fakeSNI string) *DoHNameServer { url.Scheme = "https" s := baseDOHNameServer(url, "DOHL", queryStrategy) + if fakeSNI == "" { + fakeSNI = "disabled" + } tr := &http.Transport{ IdleConnTimeout: 90 * time.Second, ForceAttemptHTTP2: true, - DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) { + DialTLSContext: func(ctx context.Context, network, addr string) (net.Conn, error) { dest, err := net.ParseDestination(network + ":" + addr) if err != nil { return nil, err @@ -111,6 +115,17 @@ func NewDoHLocalNameServer(url *url.URL, queryStrategy QueryStrategy) *DoHNameSe if err != nil { return nil, err } + utlsConfig := &utls.Config{ + ServerName: fakeSNI, + InsecureServerNameToVerify: url.Host, + } + if fakeSNI == "disabled" { + utlsConfig = nil + } + conn = utls.UClient(conn, utlsConfig, utls.HelloChrome_Auto) + if err := conn.(*utls.UConn).HandshakeContext(ctx); err != nil { + return nil, err + } return conn, nil }, } @@ -118,7 +133,7 @@ func NewDoHLocalNameServer(url *url.URL, queryStrategy QueryStrategy) *DoHNameSe Timeout: time.Second * 180, Transport: tr, } - errors.LogInfo(context.Background(), "DNS: created Local DOH client for ", url.String()) + errors.LogInfo(context.Background(), "DNS: created Local DOH client for ", url.String(), ", with fakeSNI ", fakeSNI) return s } diff --git a/app/dns/nameserver_doh_test.go b/app/dns/nameserver_doh_test.go index ae4f9cc7d36c..976a1af77e89 100644 --- a/app/dns/nameserver_doh_test.go +++ b/app/dns/nameserver_doh_test.go @@ -17,7 +17,7 @@ func TestDOHNameServer(t *testing.T) { url, err := url.Parse("https+local://1.1.1.1/dns-query") common.Must(err) - s := NewDoHLocalNameServer(url, QueryStrategy_USE_IP) + s := NewDoHLocalNameServer(url, QueryStrategy_USE_IP, "") ctx, cancel := context.WithTimeout(context.Background(), time.Second*5) ips, err := s.QueryIP(ctx, "google.com", net.IP(nil), dns_feature.IPOption{ IPv4Enable: true, @@ -34,7 +34,7 @@ func TestDOHNameServerWithCache(t *testing.T) { url, err := url.Parse("https+local://1.1.1.1/dns-query") common.Must(err) - s := NewDoHLocalNameServer(url, QueryStrategy_USE_IP) + s := NewDoHLocalNameServer(url, QueryStrategy_USE_IP, "") ctx, cancel := context.WithTimeout(context.Background(), time.Second*5) ips, err := s.QueryIP(ctx, "google.com", net.IP(nil), dns_feature.IPOption{ IPv4Enable: true, @@ -62,7 +62,7 @@ func TestDOHNameServerWithIPv4Override(t *testing.T) { url, err := url.Parse("https+local://1.1.1.1/dns-query") common.Must(err) - s := NewDoHLocalNameServer(url, QueryStrategy_USE_IP4) + s := NewDoHLocalNameServer(url, QueryStrategy_USE_IP4, "") ctx, cancel := context.WithTimeout(context.Background(), time.Second*5) ips, err := s.QueryIP(ctx, "google.com", net.IP(nil), dns_feature.IPOption{ IPv4Enable: true, @@ -85,7 +85,7 @@ func TestDOHNameServerWithIPv6Override(t *testing.T) { url, err := url.Parse("https+local://1.1.1.1/dns-query") common.Must(err) - s := NewDoHLocalNameServer(url, QueryStrategy_USE_IP6) + s := NewDoHLocalNameServer(url, QueryStrategy_USE_IP6, "") ctx, cancel := context.WithTimeout(context.Background(), time.Second*5) ips, err := s.QueryIP(ctx, "google.com", net.IP(nil), dns_feature.IPOption{ IPv4Enable: true, diff --git a/infra/conf/dns.go b/infra/conf/dns.go index d9ed9ab554f9..e50ea45cb539 100644 --- a/infra/conf/dns.go +++ b/infra/conf/dns.go @@ -19,6 +19,7 @@ type NameServerConfig struct { Domains []string ExpectIPs StringList QueryStrategy string + fakeSNI string } func (c *NameServerConfig) UnmarshalJSON(data []byte) error { @@ -36,6 +37,7 @@ func (c *NameServerConfig) UnmarshalJSON(data []byte) error { Domains []string `json:"domains"` ExpectIPs StringList `json:"expectIps"` QueryStrategy string `json:"queryStrategy"` + FakeSNI string `json:"fakeSNI"` } if err := json.Unmarshal(data, &advanced); err == nil { c.Address = advanced.Address @@ -45,6 +47,7 @@ func (c *NameServerConfig) UnmarshalJSON(data []byte) error { c.Domains = advanced.Domains c.ExpectIPs = advanced.ExpectIPs c.QueryStrategy = advanced.QueryStrategy + c.fakeSNI = advanced.FakeSNI return nil } @@ -105,6 +108,10 @@ func (c *NameServerConfig) Build() (*dns.NameServer, error) { myClientIP = []byte(c.ClientIP.IP()) } + if c.fakeSNI != "" && (!c.Address.Family().IsDomain() || !strings.HasPrefix(c.Address.Domain(), "https+local")) { + return nil, errors.New("fakeSNI only works for https+local") + } + return &dns.NameServer{ Address: &net.Endpoint{ Network: net.Network_UDP, @@ -117,6 +124,7 @@ func (c *NameServerConfig) Build() (*dns.NameServer, error) { Geoip: geoipList, OriginalRules: originalRules, QueryStrategy: resolveQueryStrategy(c.QueryStrategy), + FakeSni: c.fakeSNI, }, nil }