Add XTLS support

go.mod

@@ -13,11 +13,12 @@ require (
 	github.com/seiflotfy/cuckoofilter v0.0.0-20200511222245-56093a4d3841
 	github.com/stretchr/testify v1.6.1
 	github.com/xiaokangwang/VSign v0.0.0-20200828155424-dc1c86b73fbf
+	github.com/xtls/go v0.0.0-20200921133830-416584838a0f
 	go.starlark.net v0.0.0-20200901195727-6e684ef5eeee
 	golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a
-	golang.org/x/net v0.0.0-20200822124328-c89045814202
+	golang.org/x/net v0.0.0-20200904194848-62affa334b73
 	golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208
-	golang.org/x/sys v0.0.0-20200831180312-196b9ba8737a
+	golang.org/x/sys v0.0.0-20200918174421-af09f7315aff
 	google.golang.org/grpc v1.32.0
 	google.golang.org/protobuf v1.25.0
 	h12.io/socks v1.0.1

go.sum

@@ -6,7 +6,6 @@ github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5P
 github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
-github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgryski/go-metro v0.0.0-20200812162917-85c65e2d0165 h1:BS21ZUJ/B5X2UVUbczfmdWH7GapPWAhxcMsDnjJTU1E=
 github.com/dgryski/go-metro v0.0.0-20200812162917-85c65e2d0165/go.mod h1:c9O8+fpSOX1DM8cPNSkX/qsBWdkD4yd2dpciOWQjpBw=
@@ -18,7 +17,6 @@ github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1m
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
 github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
-github.com/golang/mock v1.4.4 h1:l75CXGRSwbaYNpl/Z2X1XIIAMSCquvXgpVZDhwEIJsc=
 github.com/golang/mock v1.4.4/go.mod h1:l3mdAwkq5BuhzHwde/uurv3sEJeZMXNpwsxVWU71h+4=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
@@ -36,28 +34,24 @@ github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMyw
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.2 h1:X2ev0eStA3AbceY54o37/0PQ/UWqKEiiO2dKL5OPaFM=
 github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0Ufc=
 github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
-github.com/h12w/go-socks5 v0.0.0-20200522160539-76189e178364 h1:5XxdakFhqd9dnXoAZy1Mb2R/DZ6D1e+0bGC/JhucGYI=
 github.com/h12w/go-socks5 v0.0.0-20200522160539-76189e178364/go.mod h1:eDJQioIyy4Yn3MVivT7rv/39gAJTrA7lgmYr8EW950c=
-github.com/miekg/dns v1.1.31 h1:sJFOl9BgwbYAWOGEwr61FU28pqsBNdpRBnhGXtO06Oo=
 github.com/miekg/dns v1.1.31/go.mod h1:KNUDUusw/aVsxyTYZM1oqvCicbwhgbNgztCETuNZ7xM=
-github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2 h1:JhzVVoYvbOACxoUmOs6V/G4D5nPVUW73rKvXxP4XUJc=
 github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2/go.mod h1:iIss55rKnNBTvrwdmkUpLnDpZoAHvWaiq5+iMmen4AE=
 github.com/pires/go-proxyproto v0.1.3 h1:2XEuhsQluSNA5QIQkiUv8PfgZ51sNYIQkq/yFquiSQM=
 github.com/pires/go-proxyproto v0.1.3/go.mod h1:Odh9VFOZJCf9G8cLW5o435Xf1J95Jw9Gw5rnCjcwzAY=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/seiflotfy/cuckoofilter v0.0.0-20200511222245-56093a4d3841 h1:pnfutQFsV7ySmHUeX6ANGfPsBo29RctUvDn8G3rmJVw=
 github.com/seiflotfy/cuckoofilter v0.0.0-20200511222245-56093a4d3841/go.mod h1:ET5mVvNjwaGXRgZxO9UZr7X+8eAf87AfIYNwRSp9s4Y=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/xiaokangwang/VSign v0.0.0-20200828155424-dc1c86b73fbf h1:d4keT3SwLbrgnEe2zbtijPLgKE15n0ZbvJZzRH/a9GM=
 github.com/xiaokangwang/VSign v0.0.0-20200828155424-dc1c86b73fbf/go.mod h1:jTwBnzBuqZP3VX/Z65ErYb9zd4anQprSC7N38TmAp1E=
+github.com/xtls/go v0.0.0-20200921133830-416584838a0f h1:HNJx0SKT77PmtX0Xj8Ep5ak3cIG19ZFxCYkMa2yJfSg=
+github.com/xtls/go v0.0.0-20200921133830-416584838a0f/go.mod h1:5TB2+k58gx4A4g2Nf5miSHNDF6CuAzHKpWBooLAshTs=
 go.starlark.net v0.0.0-20200901195727-6e684ef5eeee h1:N4eRtIIYHZE5Mw/Km/orb+naLdwAe+lv2HCxRR5rEBw=
 go.starlark.net v0.0.0-20200901195727-6e684ef5eeee/go.mod h1:f0znQkUKRrkk36XxWbGjMqQM8wGv/xHBVE2qc3B5oFU=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
@@ -77,13 +71,12 @@ golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190923162816-aa69164e4478/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20200822124328-c89045814202 h1:VvcQYSHwXgi7W+TpUR6A9g6Up98WAHf3f/ulnJ62IyA=
+golang.org/x/net v0.0.0-20200904194848-62affa334b73 h1:MXfv8rhZWmFeqX3GNZRsd6vOLoaCHjYEX3qkRo3YBUA=
-golang.org/x/net v0.0.0-20200822124328-c89045814202/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
+golang.org/x/net v0.0.0-20200904194848-62affa334b73/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208 h1:qwRHBd0NqMbJxfbotnDhm2ByMI1Shq4Y6oRJo21SGJA=
 golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -91,8 +84,8 @@ golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190924154521-2837fb4f24fe/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200831180312-196b9ba8737a h1:i47hUS795cOydZI4AwJQCKXOr4BvxzvikwDoDtHhP2Y=
+golang.org/x/sys v0.0.0-20200918174421-af09f7315aff h1:1CPUrky56AcgSpxz/KfgzQWzfG09u5YOL8MvPYBlrL8=
-golang.org/x/sys v0.0.0-20200831180312-196b9ba8737a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200918174421-af09f7315aff/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
@@ -102,7 +95,6 @@ golang.org/x/tools v0.0.0-20190425150028-36563e24a262/go.mod h1:RgjU9mgBXZiqYHBn
 golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
 golang.org/x/tools v0.0.0-20191216052735-49a3e744a425/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
@@ -114,8 +106,6 @@ google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZi
 google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
 google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
 google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
-google.golang.org/grpc v1.31.1 h1:SfXqXS5hkufcdZ/mHtYCh53P2b+92WQq/DZcKLgsFRs=
-google.golang.org/grpc v1.31.1/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
 google.golang.org/grpc v1.32.0 h1:zWTV+LMdc3kaiJMSTOFz2UgSBgx8RNQoTGiZu3fR9S0=
 google.golang.org/grpc v1.32.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
@@ -128,11 +118,8 @@ google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2
 google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.25.0 h1:Ejskq+SyPohKW+1uil0JJMtmHCgJPJ/qWTxr8qp+R4c=
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-h12.io/socks v1.0.1 h1:bXESSI/+hbdrp+22vcc7/JiXjmLH4UWktKdYgGr3ShA=
 h12.io/socks v1.0.1/go.mod h1:AIhxy1jOId/XCz9BO+EIgNL2rQiPTBNnOfnVnQ+3Eck=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

infra/conf/transport_internet.go

@@ -16,6 +16,7 @@ import (
 	"v2ray.com/core/transport/internet/tcp"
 	"v2ray.com/core/transport/internet/tls"
 	"v2ray.com/core/transport/internet/websocket"
+	"v2ray.com/core/transport/internet/xtls"
 )
 
 var (
@@ -168,6 +169,7 @@ type HTTPConfig struct {
 	Path string      `json:"path"`
 }
 
+// Build implements Buildable.
 func (c *HTTPConfig) Build() (proto.Message, error) {
 	config := &http.Config{
 		Path: c.Path,
@@ -184,6 +186,7 @@ type QUICConfig struct {
 	Key      string          `json:"key"`
 }
 
+// Build implements Buildable.
 func (c *QUICConfig) Build() (proto.Message, error) {
 	config := &quic.Config{
 		Key: c.Key,
@@ -225,6 +228,7 @@ type DomainSocketConfig struct {
 	AcceptProxyProtocol bool   `json:"acceptProxyProtocol"`
 }
 
+// Build implements Buildable.
 func (c *DomainSocketConfig) Build() (proto.Message, error) {
 	return &domainsocket.Config{
 		Path:                c.Path,
@@ -234,14 +238,6 @@ func (c *DomainSocketConfig) Build() (proto.Message, error) {
 	}, nil
 }
 
-type TLSCertConfig struct {
-	CertFile string   `json:"certificateFile"`
-	CertStr  []string `json:"certificate"`
-	KeyFile  string   `json:"keyFile"`
-	KeyStr   []string `json:"key"`
-	Usage    string   `json:"usage"`
-}
-
 func readFileOrString(f string, s []string) ([]byte, error) {
 	if len(f) > 0 {
 		return filesystem.ReadFile(f)
@@ -252,6 +248,15 @@ func readFileOrString(f string, s []string) ([]byte, error) {
 	return nil, newError("both file and bytes are empty.")
 }
 
+type TLSCertConfig struct {
+	CertFile string   `json:"certificateFile"`
+	CertStr  []string `json:"certificate"`
+	KeyFile  string   `json:"keyFile"`
+	KeyStr   []string `json:"key"`
+	Usage    string   `json:"usage"`
+}
+
+// Build implements Buildable.
 func (c *TLSCertConfig) Build() (*tls.Certificate, error) {
 	certificate := new(tls.Certificate)
 
@@ -318,6 +323,81 @@ func (c *TLSConfig) Build() (proto.Message, error) {
 	return config, nil
 }
 
+type XTLSCertConfig struct {
+	CertFile string   `json:"certificateFile"`
+	CertStr  []string `json:"certificate"`
+	KeyFile  string   `json:"keyFile"`
+	KeyStr   []string `json:"key"`
+	Usage    string   `json:"usage"`
+}
+
+// Build implements Buildable.
+func (c *XTLSCertConfig) Build() (*xtls.Certificate, error) {
+	certificate := new(xtls.Certificate)
+
+	cert, err := readFileOrString(c.CertFile, c.CertStr)
+	if err != nil {
+		return nil, newError("failed to parse certificate").Base(err)
+	}
+	certificate.Certificate = cert
+
+	if len(c.KeyFile) > 0 || len(c.KeyStr) > 0 {
+		key, err := readFileOrString(c.KeyFile, c.KeyStr)
+		if err != nil {
+			return nil, newError("failed to parse key").Base(err)
+		}
+		certificate.Key = key
+	}
+
+	switch strings.ToLower(c.Usage) {
+	case "encipherment":
+		certificate.Usage = xtls.Certificate_ENCIPHERMENT
+	case "verify":
+		certificate.Usage = xtls.Certificate_AUTHORITY_VERIFY
+	case "issue":
+		certificate.Usage = xtls.Certificate_AUTHORITY_ISSUE
+	default:
+		certificate.Usage = xtls.Certificate_ENCIPHERMENT
+	}
+
+	return certificate, nil
+}
+
+type XTLSConfig struct {
+	Insecure                 bool              `json:"allowInsecure"`
+	InsecureCiphers          bool              `json:"allowInsecureCiphers"`
+	Certs                    []*XTLSCertConfig `json:"certificates"`
+	ServerName               string            `json:"serverName"`
+	ALPN                     *StringList       `json:"alpn"`
+	DisableSessionResumption bool              `json:"disableSessionResumption"`
+	DisableSystemRoot        bool              `json:"disableSystemRoot"`
+}
+
+// Build implements Buildable.
+func (c *XTLSConfig) Build() (proto.Message, error) {
+	config := new(xtls.Config)
+	config.Certificate = make([]*xtls.Certificate, len(c.Certs))
+	for idx, certConf := range c.Certs {
+		cert, err := certConf.Build()
+		if err != nil {
+			return nil, err
+		}
+		config.Certificate[idx] = cert
+	}
+	serverName := c.ServerName
+	config.AllowInsecure = c.Insecure
+	config.AllowInsecureCiphers = c.InsecureCiphers
+	if len(c.ServerName) > 0 {
+		config.ServerName = serverName
+	}
+	if c.ALPN != nil && len(*c.ALPN) > 0 {
+		config.NextProtocol = []string(*c.ALPN)
+	}
+	config.DisableSessionResumption = c.DisableSessionResumption
+	config.DisableSystemRoot = c.DisableSystemRoot
+	return config, nil
+}
+
 type TransportProtocol string
 
 // Build implements Buildable.
@@ -346,6 +426,7 @@ type SocketConfig struct {
 	TProxy string `json:"tproxy"`
 }
 
+// Build implements Buildable.
 func (c *SocketConfig) Build() (*internet.SocketConfig, error) {
 	var tfoSettings internet.SocketConfig_TCPFastOpenState
 	if c.TFO != nil {
@@ -376,6 +457,7 @@ type StreamConfig struct {
 	Network        *TransportProtocol  `json:"network"`
 	Security       string              `json:"security"`
 	TLSSettings    *TLSConfig          `json:"tlsSettings"`
+	XTLSSettings   *XTLSConfig         `json:"xtlsSettings"`
 	TCPSettings    *TCPConfig          `json:"tcpSettings"`
 	KCPSettings    *KCPConfig          `json:"kcpSettings"`
 	WSSettings     *WebSocketConfig    `json:"wsSettings"`
@@ -400,6 +482,9 @@ func (c *StreamConfig) Build() (*internet.StreamConfig, error) {
 	if strings.EqualFold(c.Security, "tls") {
 		tlsSettings := c.TLSSettings
 		if tlsSettings == nil {
+			if c.XTLSSettings != nil {
+				return nil, newError(`TLS: Please use "tlsSettings" instead of "xtlsSettings".`)
+			}
 			tlsSettings = &TLSConfig{}
 		}
 		ts, err := tlsSettings.Build()
@@ -410,6 +495,25 @@ func (c *StreamConfig) Build() (*internet.StreamConfig, error) {
 		config.SecuritySettings = append(config.SecuritySettings, tm)
 		config.SecurityType = tm.Type
 	}
+	if strings.EqualFold(c.Security, "xtls") {
+		if config.ProtocolName != "tcp" {
+			return nil, newError("XTLS only supports TCP for now.")
+		}
+		xtlsSettings := c.XTLSSettings
+		if xtlsSettings == nil {
+			if c.TLSSettings != nil {
+				return nil, newError(`XTLS: Please use "xtlsSettings" instead of "tlsSettings".`)
+			}
+			xtlsSettings = &XTLSConfig{}
+		}
+		ts, err := xtlsSettings.Build()
+		if err != nil {
+			return nil, newError("Failed to build XTLS config.").Base(err)
+		}
+		tm := serial.ToTypedMessage(ts)
+		config.SecuritySettings = append(config.SecuritySettings, tm)
+		config.SecurityType = tm.Type
+	}
 	if c.TCPSettings != nil {
 		ts, err := c.TCPSettings.Build()
 		if err != nil {
@@ -463,7 +567,7 @@ func (c *StreamConfig) Build() (*internet.StreamConfig, error) {
 	if c.QUICSettings != nil {
 		qs, err := c.QUICSettings.Build()
 		if err != nil {
-			return nil, newError("failed to build QUIC config").Base(err)
+			return nil, newError("Failed to build QUIC config").Base(err)
 		}
 		config.TransportSettings = append(config.TransportSettings, &internet.TransportConfig{
 			ProtocolName: "quic",
@@ -473,7 +577,7 @@ func (c *StreamConfig) Build() (*internet.StreamConfig, error) {
 	if c.SocketSettings != nil {
 		ss, err := c.SocketSettings.Build()
 		if err != nil {
-			return nil, newError("failed to build sockopt").Base(err)
+			return nil, newError("Failed to build sockopt").Base(err)
 		}
 		config.SocketSettings = ss
 	}

infra/conf/v2ray.go

@@ -11,6 +11,7 @@ import (
 	"v2ray.com/core/app/proxyman"
 	"v2ray.com/core/app/stats"
 	"v2ray.com/core/common/serial"
+	"v2ray.com/core/transport/internet/xtls"
 )
 
 var (
@@ -59,6 +60,7 @@ type SniffingConfig struct {
 	DestOverride *StringList `json:"destOverride"`
 }
 
+// Build implements Buildable.
 func (c *SniffingConfig) Build() (*proxyman.SniffingConfig, error) {
 	var p []string
 	if c.DestOverride != nil {
@@ -184,6 +186,9 @@ func (c *InboundDetourConfig) Build() (*core.InboundHandlerConfig, error) {
 		if err != nil {
 			return nil, err
 		}
+		if ss.SecurityType == serial.GetMessageType(&xtls.Config{}) && !strings.EqualFold(c.Protocol, "vless") {
+			return nil, newError("XTLS only supports VLESS for now.")
+		}
 		receiverSettings.StreamSettings = ss
 	}
 	if c.SniffingConfig != nil {
@@ -251,6 +256,9 @@ func (c *OutboundDetourConfig) Build() (*core.OutboundHandlerConfig, error) {
 		if err != nil {
 			return nil, err
 		}
+		if ss.SecurityType == serial.GetMessageType(&xtls.Config{}) && !strings.EqualFold(c.Protocol, "vless") {
+			return nil, newError("XTLS only supports VLESS for now.")
+		}
 		senderSettings.StreamSettings = ss
 	}
 
@@ -263,7 +271,15 @@ func (c *OutboundDetourConfig) Build() (*core.OutboundHandlerConfig, error) {
 	}
 
 	if c.MuxSettings != nil {
-		senderSettings.MultiplexSettings = c.MuxSettings.Build()
+		ms := c.MuxSettings.Build()
+		if ms != nil && ms.Enabled {
+			if ss := senderSettings.StreamSettings; ss != nil {
+				if ss.SecurityType == serial.GetMessageType(&xtls.Config{}) {
+					return nil, newError("XTLS doesn't support Mux for now.")
+				}
+			}
+		}
+		senderSettings.MultiplexSettings = ms
 	}
 
 	settings := []byte("{}")
@@ -288,6 +304,7 @@ func (c *OutboundDetourConfig) Build() (*core.OutboundHandlerConfig, error) {
 
 type StatsConfig struct{}
 
+// Build implements Buildable.
 func (c *StatsConfig) Build() (*stats.Config, error) {
 	return &stats.Config{}, nil
 }

infra/conf/v2ray_test.go

@@ -404,39 +404,39 @@ func TestConfig_Override(t *testing.T) {
 			},
 		},
 		{"combine/newattr",
-			&Config{InboundConfigs: []InboundDetourConfig{InboundDetourConfig{Tag: "old"}}},
+			&Config{InboundConfigs: []InboundDetourConfig{{Tag: "old"}}},
 			&Config{LogConfig: &LogConfig{}}, "",
-			&Config{LogConfig: &LogConfig{}, InboundConfigs: []InboundDetourConfig{InboundDetourConfig{Tag: "old"}}}},
+			&Config{LogConfig: &LogConfig{}, InboundConfigs: []InboundDetourConfig{{Tag: "old"}}}},
 		{"replace/inbounds",
-			&Config{InboundConfigs: []InboundDetourConfig{InboundDetourConfig{Tag: "pos0"}, InboundDetourConfig{Protocol: "vmess", Tag: "pos1"}}},
+			&Config{InboundConfigs: []InboundDetourConfig{{Tag: "pos0"}, {Protocol: "vmess", Tag: "pos1"}}},
-			&Config{InboundConfigs: []InboundDetourConfig{InboundDetourConfig{Tag: "pos1", Protocol: "kcp"}}},
+			&Config{InboundConfigs: []InboundDetourConfig{{Tag: "pos1", Protocol: "kcp"}}},
 			"",
-			&Config{InboundConfigs: []InboundDetourConfig{InboundDetourConfig{Tag: "pos0"}, InboundDetourConfig{Tag: "pos1", Protocol: "kcp"}}}},
+			&Config{InboundConfigs: []InboundDetourConfig{{Tag: "pos0"}, {Tag: "pos1", Protocol: "kcp"}}}},
 		{"replace/inbounds-replaceall",
-			&Config{InboundConfigs: []InboundDetourConfig{InboundDetourConfig{Tag: "pos0"}, InboundDetourConfig{Protocol: "vmess", Tag: "pos1"}}},
+			&Config{InboundConfigs: []InboundDetourConfig{{Tag: "pos0"}, {Protocol: "vmess", Tag: "pos1"}}},
-			&Config{InboundConfigs: []InboundDetourConfig{InboundDetourConfig{Tag: "pos1", Protocol: "kcp"}, InboundDetourConfig{Tag: "pos2", Protocol: "kcp"}}},
+			&Config{InboundConfigs: []InboundDetourConfig{{Tag: "pos1", Protocol: "kcp"}, {Tag: "pos2", Protocol: "kcp"}}},
 			"",
-			&Config{InboundConfigs: []InboundDetourConfig{InboundDetourConfig{Tag: "pos1", Protocol: "kcp"}, InboundDetourConfig{Tag: "pos2", Protocol: "kcp"}}}},
+			&Config{InboundConfigs: []InboundDetourConfig{{Tag: "pos1", Protocol: "kcp"}, {Tag: "pos2", Protocol: "kcp"}}}},
 		{"replace/notag-append",
-			&Config{InboundConfigs: []InboundDetourConfig{InboundDetourConfig{}, InboundDetourConfig{Protocol: "vmess"}}},
+			&Config{InboundConfigs: []InboundDetourConfig{{}, {Protocol: "vmess"}}},
-			&Config{InboundConfigs: []InboundDetourConfig{InboundDetourConfig{Tag: "pos1", Protocol: "kcp"}}},
+			&Config{InboundConfigs: []InboundDetourConfig{{Tag: "pos1", Protocol: "kcp"}}},
 			"",
-			&Config{InboundConfigs: []InboundDetourConfig{InboundDetourConfig{}, InboundDetourConfig{Protocol: "vmess"}, InboundDetourConfig{Tag: "pos1", Protocol: "kcp"}}}},
+			&Config{InboundConfigs: []InboundDetourConfig{{}, {Protocol: "vmess"}, {Tag: "pos1", Protocol: "kcp"}}}},
 		{"replace/outbounds",
-			&Config{OutboundConfigs: []OutboundDetourConfig{OutboundDetourConfig{Tag: "pos0"}, OutboundDetourConfig{Protocol: "vmess", Tag: "pos1"}}},
+			&Config{OutboundConfigs: []OutboundDetourConfig{{Tag: "pos0"}, {Protocol: "vmess", Tag: "pos1"}}},
-			&Config{OutboundConfigs: []OutboundDetourConfig{OutboundDetourConfig{Tag: "pos1", Protocol: "kcp"}}},
+			&Config{OutboundConfigs: []OutboundDetourConfig{{Tag: "pos1", Protocol: "kcp"}}},
 			"",
-			&Config{OutboundConfigs: []OutboundDetourConfig{OutboundDetourConfig{Tag: "pos0"}, OutboundDetourConfig{Tag: "pos1", Protocol: "kcp"}}}},
+			&Config{OutboundConfigs: []OutboundDetourConfig{{Tag: "pos0"}, {Tag: "pos1", Protocol: "kcp"}}}},
 		{"replace/outbounds-prepend",
-			&Config{OutboundConfigs: []OutboundDetourConfig{OutboundDetourConfig{Tag: "pos0"}, OutboundDetourConfig{Protocol: "vmess", Tag: "pos1"}}},
+			&Config{OutboundConfigs: []OutboundDetourConfig{{Tag: "pos0"}, {Protocol: "vmess", Tag: "pos1"}}},
-			&Config{OutboundConfigs: []OutboundDetourConfig{OutboundDetourConfig{Tag: "pos1", Protocol: "kcp"}, OutboundDetourConfig{Tag: "pos2", Protocol: "kcp"}}},
+			&Config{OutboundConfigs: []OutboundDetourConfig{{Tag: "pos1", Protocol: "kcp"}, {Tag: "pos2", Protocol: "kcp"}}},
 			"config.json",
-			&Config{OutboundConfigs: []OutboundDetourConfig{OutboundDetourConfig{Tag: "pos1", Protocol: "kcp"}, OutboundDetourConfig{Tag: "pos2", Protocol: "kcp"}}}},
+			&Config{OutboundConfigs: []OutboundDetourConfig{{Tag: "pos1", Protocol: "kcp"}, {Tag: "pos2", Protocol: "kcp"}}}},
 		{"replace/outbounds-append",
-			&Config{OutboundConfigs: []OutboundDetourConfig{OutboundDetourConfig{Tag: "pos0"}, OutboundDetourConfig{Protocol: "vmess", Tag: "pos1"}}},
+			&Config{OutboundConfigs: []OutboundDetourConfig{{Tag: "pos0"}, {Protocol: "vmess", Tag: "pos1"}}},
-			&Config{OutboundConfigs: []OutboundDetourConfig{OutboundDetourConfig{Tag: "pos2", Protocol: "kcp"}}},
+			&Config{OutboundConfigs: []OutboundDetourConfig{{Tag: "pos2", Protocol: "kcp"}}},
 			"config_tail.json",
-			&Config{OutboundConfigs: []OutboundDetourConfig{OutboundDetourConfig{Tag: "pos0"}, OutboundDetourConfig{Protocol: "vmess", Tag: "pos1"}, OutboundDetourConfig{Tag: "pos2", Protocol: "kcp"}}}},
+			&Config{OutboundConfigs: []OutboundDetourConfig{{Tag: "pos0"}, {Protocol: "vmess", Tag: "pos1"}, {Tag: "pos2", Protocol: "kcp"}}}},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {

main/distro/all/all.go

@@ -45,6 +45,7 @@ import (
 	_ "v2ray.com/core/transport/internet/tls"
 	_ "v2ray.com/core/transport/internet/udp"
 	_ "v2ray.com/core/transport/internet/websocket"
+	_ "v2ray.com/core/transport/internet/xtls"
 
 	// Transport headers
 	_ "v2ray.com/core/transport/internet/headers/http"

transport/internet/tcp/dialer.go

@@ -10,6 +10,7 @@ import (
 	"v2ray.com/core/common/session"
 	"v2ray.com/core/transport/internet"
 	"v2ray.com/core/transport/internet/tls"
+	"v2ray.com/core/transport/internet/xtls"
 )
 
 // Dial dials a new TCP connection to the given destination.
@@ -30,6 +31,9 @@ func Dial(ctx context.Context, dest net.Destination, streamSettings *internet.Me
 			}
 		*/
 		conn = tls.Client(conn, tlsConfig)
+	} else if config := xtls.ConfigFromStreamSettings(streamSettings); config != nil {
+		xtlsConfig := config.GetXTLSConfig(xtls.WithDestination(dest))
+		conn = xtls.Client(conn, xtlsConfig)
 	}
 
 	tcpSettings := streamSettings.ProtocolSettings.(*Config)

transport/internet/tcp/hub.go

@@ -9,18 +9,21 @@ import (
 	"time"
 
 	"github.com/pires/go-proxyproto"
+	goxtls "github.com/xtls/go"
 
 	"v2ray.com/core/common"
 	"v2ray.com/core/common/net"
 	"v2ray.com/core/common/session"
 	"v2ray.com/core/transport/internet"
 	"v2ray.com/core/transport/internet/tls"
+	"v2ray.com/core/transport/internet/xtls"
 )
 
 // Listener is an internet.Listener that listens for TCP connections.
 type Listener struct {
 	listener   net.Listener
 	tlsConfig  *gotls.Config
+	xtlsConfig *goxtls.Config
 	authConfig internet.ConnectionAuthenticator
 	config     *Config
 	addConn    internet.ConnHandler
@@ -59,6 +62,9 @@ func ListenTCP(ctx context.Context, address net.Address, port net.Port, streamSe
 	if config := tls.ConfigFromStreamSettings(streamSettings); config != nil {
 		l.tlsConfig = config.GetTLSConfig(tls.WithNextProto("h2"))
 	}
+	if config := xtls.ConfigFromStreamSettings(streamSettings); config != nil {
+		l.xtlsConfig = config.GetXTLSConfig(xtls.WithNextProto("h2"))
+	}
 
 	if tcpSettings.HeaderSettings != nil {
 		headerConfig, err := tcpSettings.HeaderSettings.GetInstance()
@@ -93,6 +99,8 @@ func (v *Listener) keepAccepting() {
 
 		if v.tlsConfig != nil {
 			conn = tls.Server(conn, v.tlsConfig)
+		} else if v.xtlsConfig != nil {
+			conn = xtls.Server(conn, v.xtlsConfig)
 		}
 		if v.authConfig != nil {
 			conn = v.authConfig.Server(conn)

transport/internet/xtls/config.go

@@ -0,0 +1,231 @@
+// +build !confonly
+
+package xtls
+
+import (
+	"crypto/x509"
+	"sync"
+	"time"
+
+	xtls "github.com/xtls/go"
+
+	"v2ray.com/core/common/net"
+	"v2ray.com/core/common/protocol/tls/cert"
+	"v2ray.com/core/transport/internet"
+)
+
+var (
+	globalSessionCache = xtls.NewLRUClientSessionCache(128)
+)
+
+// ParseCertificate converts a cert.Certificate to Certificate.
+func ParseCertificate(c *cert.Certificate) *Certificate {
+	certPEM, keyPEM := c.ToPEM()
+	return &Certificate{
+		Certificate: certPEM,
+		Key:         keyPEM,
+	}
+}
+
+func (c *Config) loadSelfCertPool() (*x509.CertPool, error) {
+	root := x509.NewCertPool()
+	for _, cert := range c.Certificate {
+		if !root.AppendCertsFromPEM(cert.Certificate) {
+			return nil, newError("failed to append cert").AtWarning()
+		}
+	}
+	return root, nil
+}
+
+// BuildCertificates builds a list of TLS certificates from proto definition.
+func (c *Config) BuildCertificates() []xtls.Certificate {
+	certs := make([]xtls.Certificate, 0, len(c.Certificate))
+	for _, entry := range c.Certificate {
+		if entry.Usage != Certificate_ENCIPHERMENT {
+			continue
+		}
+		keyPair, err := xtls.X509KeyPair(entry.Certificate, entry.Key)
+		if err != nil {
+			newError("ignoring invalid X509 key pair").Base(err).AtWarning().WriteToLog()
+			continue
+		}
+		certs = append(certs, keyPair)
+	}
+	return certs
+}
+
+func isCertificateExpired(c *xtls.Certificate) bool {
+	if c.Leaf == nil && len(c.Certificate) > 0 {
+		if pc, err := x509.ParseCertificate(c.Certificate[0]); err == nil {
+			c.Leaf = pc
+		}
+	}
+
+	// If leaf is not there, the certificate is probably not used yet. We trust user to provide a valid certificate.
+	return c.Leaf != nil && c.Leaf.NotAfter.Before(time.Now().Add(-time.Minute))
+}
+
+func issueCertificate(rawCA *Certificate, domain string) (*xtls.Certificate, error) {
+	parent, err := cert.ParseCertificate(rawCA.Certificate, rawCA.Key)
+	if err != nil {
+		return nil, newError("failed to parse raw certificate").Base(err)
+	}
+	newCert, err := cert.Generate(parent, cert.CommonName(domain), cert.DNSNames(domain))
+	if err != nil {
+		return nil, newError("failed to generate new certificate for ", domain).Base(err)
+	}
+	newCertPEM, newKeyPEM := newCert.ToPEM()
+	cert, err := xtls.X509KeyPair(newCertPEM, newKeyPEM)
+	return &cert, err
+}
+
+func (c *Config) getCustomCA() []*Certificate {
+	certs := make([]*Certificate, 0, len(c.Certificate))
+	for _, certificate := range c.Certificate {
+		if certificate.Usage == Certificate_AUTHORITY_ISSUE {
+			certs = append(certs, certificate)
+		}
+	}
+	return certs
+}
+
+func getGetCertificateFunc(c *xtls.Config, ca []*Certificate) func(hello *xtls.ClientHelloInfo) (*xtls.Certificate, error) {
+	var access sync.RWMutex
+
+	return func(hello *xtls.ClientHelloInfo) (*xtls.Certificate, error) {
+		domain := hello.ServerName
+		certExpired := false
+
+		access.RLock()
+		certificate, found := c.NameToCertificate[domain]
+		access.RUnlock()
+
+		if found {
+			if !isCertificateExpired(certificate) {
+				return certificate, nil
+			}
+			certExpired = true
+		}
+
+		if certExpired {
+			newCerts := make([]xtls.Certificate, 0, len(c.Certificates))
+
+			access.Lock()
+			for _, certificate := range c.Certificates {
+				if !isCertificateExpired(&certificate) {
+					newCerts = append(newCerts, certificate)
+				}
+			}
+
+			c.Certificates = newCerts
+			access.Unlock()
+		}
+
+		var issuedCertificate *xtls.Certificate
+
+		// Create a new certificate from existing CA if possible
+		for _, rawCert := range ca {
+			if rawCert.Usage == Certificate_AUTHORITY_ISSUE {
+				newCert, err := issueCertificate(rawCert, domain)
+				if err != nil {
+					newError("failed to issue new certificate for ", domain).Base(err).WriteToLog()
+					continue
+				}
+
+				access.Lock()
+				c.Certificates = append(c.Certificates, *newCert)
+				issuedCertificate = &c.Certificates[len(c.Certificates)-1]
+				access.Unlock()
+				break
+			}
+		}
+
+		if issuedCertificate == nil {
+			return nil, newError("failed to create a new certificate for ", domain)
+		}
+
+		access.Lock()
+		c.BuildNameToCertificate()
+		access.Unlock()
+
+		return issuedCertificate, nil
+	}
+}
+
+func (c *Config) parseServerName() string {
+	return c.ServerName
+}
+
+// GetXTLSConfig converts this Config into xtls.Config.
+func (c *Config) GetXTLSConfig(opts ...Option) *xtls.Config {
+	root, err := c.getCertPool()
+	if err != nil {
+		newError("failed to load system root certificate").AtError().Base(err).WriteToLog()
+	}
+
+	config := &xtls.Config{
+		ClientSessionCache:     globalSessionCache,
+		RootCAs:                root,
+		InsecureSkipVerify:     c.AllowInsecure,
+		NextProtos:             c.NextProtocol,
+		SessionTicketsDisabled: c.DisableSessionResumption,
+	}
+	if c == nil {
+		return config
+	}
+
+	for _, opt := range opts {
+		opt(config)
+	}
+
+	config.Certificates = c.BuildCertificates()
+	config.BuildNameToCertificate()
+
+	caCerts := c.getCustomCA()
+	if len(caCerts) > 0 {
+		config.GetCertificate = getGetCertificateFunc(config, caCerts)
+	}
+
+	if sn := c.parseServerName(); len(sn) > 0 {
+		config.ServerName = sn
+	}
+
+	if len(config.NextProtos) == 0 {
+		config.NextProtos = []string{"h2", "http/1.1"}
+	}
+
+	return config
+}
+
+// Option for building XTLS config.
+type Option func(*xtls.Config)
+
+// WithDestination sets the server name in XTLS config.
+func WithDestination(dest net.Destination) Option {
+	return func(config *xtls.Config) {
+		if dest.Address.Family().IsDomain() && config.ServerName == "" {
+			config.ServerName = dest.Address.Domain()
+		}
+	}
+}
+
+// WithNextProto sets the ALPN values in XTLS config.
+func WithNextProto(protocol ...string) Option {
+	return func(config *xtls.Config) {
+		if len(config.NextProtos) == 0 {
+			config.NextProtos = protocol
+		}
+	}
+}
+
+// ConfigFromStreamSettings fetches Config from stream settings. Nil if not found.
+func ConfigFromStreamSettings(settings *internet.MemoryStreamConfig) *Config {
+	if settings == nil {
+		return nil
+	}
+	config, ok := settings.SecuritySettings.(*Config)
+	if !ok {
+		return nil
+	}
+	return config
+}

transport/internet/xtls/config.pb.go

@@ -0,0 +1,378 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.25.0
+// 	protoc        v3.13.0
+// source: transport/internet/xtls/config.proto
+
+package xtls
+
+import (
+	proto "github.com/golang/protobuf/proto"
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+// This is a compile-time assertion that a sufficiently up-to-date version
+// of the legacy proto package is being used.
+const _ = proto.ProtoPackageIsVersion4
+
+type Certificate_Usage int32
+
+const (
+	Certificate_ENCIPHERMENT     Certificate_Usage = 0
+	Certificate_AUTHORITY_VERIFY Certificate_Usage = 1
+	Certificate_AUTHORITY_ISSUE  Certificate_Usage = 2
+)
+
+// Enum value maps for Certificate_Usage.
+var (
+	Certificate_Usage_name = map[int32]string{
+		0: "ENCIPHERMENT",
+		1: "AUTHORITY_VERIFY",
+		2: "AUTHORITY_ISSUE",
+	}
+	Certificate_Usage_value = map[string]int32{
+		"ENCIPHERMENT":     0,
+		"AUTHORITY_VERIFY": 1,
+		"AUTHORITY_ISSUE":  2,
+	}
+)
+
+func (x Certificate_Usage) Enum() *Certificate_Usage {
+	p := new(Certificate_Usage)
+	*p = x
+	return p
+}
+
+func (x Certificate_Usage) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (Certificate_Usage) Descriptor() protoreflect.EnumDescriptor {
+	return file_transport_internet_xtls_config_proto_enumTypes[0].Descriptor()
+}
+
+func (Certificate_Usage) Type() protoreflect.EnumType {
+	return &file_transport_internet_xtls_config_proto_enumTypes[0]
+}
+
+func (x Certificate_Usage) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use Certificate_Usage.Descriptor instead.
+func (Certificate_Usage) EnumDescriptor() ([]byte, []int) {
+	return file_transport_internet_xtls_config_proto_rawDescGZIP(), []int{0, 0}
+}
+
+type Certificate struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// XTLS certificate in x509 format.
+	Certificate []byte `protobuf:"bytes,1,opt,name=Certificate,proto3" json:"Certificate,omitempty"`
+	// XTLS key in x509 format.
+	Key   []byte            `protobuf:"bytes,2,opt,name=Key,proto3" json:"Key,omitempty"`
+	Usage Certificate_Usage `protobuf:"varint,3,opt,name=usage,proto3,enum=v2ray.core.transport.internet.xtls.Certificate_Usage" json:"usage,omitempty"`
+}
+
+func (x *Certificate) Reset() {
+	*x = Certificate{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_transport_internet_xtls_config_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Certificate) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Certificate) ProtoMessage() {}
+
+func (x *Certificate) ProtoReflect() protoreflect.Message {
+	mi := &file_transport_internet_xtls_config_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Certificate.ProtoReflect.Descriptor instead.
+func (*Certificate) Descriptor() ([]byte, []int) {
+	return file_transport_internet_xtls_config_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Certificate) GetCertificate() []byte {
+	if x != nil {
+		return x.Certificate
+	}
+	return nil
+}
+
+func (x *Certificate) GetKey() []byte {
+	if x != nil {
+		return x.Key
+	}
+	return nil
+}
+
+func (x *Certificate) GetUsage() Certificate_Usage {
+	if x != nil {
+		return x.Usage
+	}
+	return Certificate_ENCIPHERMENT
+}
+
+type Config struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Whether or not to allow self-signed certificates.
+	AllowInsecure bool `protobuf:"varint,1,opt,name=allow_insecure,json=allowInsecure,proto3" json:"allow_insecure,omitempty"`
+	// Whether or not to allow insecure cipher suites.
+	AllowInsecureCiphers bool `protobuf:"varint,5,opt,name=allow_insecure_ciphers,json=allowInsecureCiphers,proto3" json:"allow_insecure_ciphers,omitempty"`
+	// List of certificates to be served on server.
+	Certificate []*Certificate `protobuf:"bytes,2,rep,name=certificate,proto3" json:"certificate,omitempty"`
+	// Override server name.
+	ServerName string `protobuf:"bytes,3,opt,name=server_name,json=serverName,proto3" json:"server_name,omitempty"`
+	// Lists of string as ALPN values.
+	NextProtocol []string `protobuf:"bytes,4,rep,name=next_protocol,json=nextProtocol,proto3" json:"next_protocol,omitempty"`
+	// Whether or not to disable session (ticket) resumption.
+	DisableSessionResumption bool `protobuf:"varint,6,opt,name=disable_session_resumption,json=disableSessionResumption,proto3" json:"disable_session_resumption,omitempty"`
+	// If true, root certificates on the system will not be loaded for verification.
+	DisableSystemRoot bool `protobuf:"varint,7,opt,name=disable_system_root,json=disableSystemRoot,proto3" json:"disable_system_root,omitempty"`
+}
+
+func (x *Config) Reset() {
+	*x = Config{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_transport_internet_xtls_config_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Config) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Config) ProtoMessage() {}
+
+func (x *Config) ProtoReflect() protoreflect.Message {
+	mi := &file_transport_internet_xtls_config_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Config.ProtoReflect.Descriptor instead.
+func (*Config) Descriptor() ([]byte, []int) {
+	return file_transport_internet_xtls_config_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *Config) GetAllowInsecure() bool {
+	if x != nil {
+		return x.AllowInsecure
+	}
+	return false
+}
+
+func (x *Config) GetAllowInsecureCiphers() bool {
+	if x != nil {
+		return x.AllowInsecureCiphers
+	}
+	return false
+}
+
+func (x *Config) GetCertificate() []*Certificate {
+	if x != nil {
+		return x.Certificate
+	}
+	return nil
+}
+
+func (x *Config) GetServerName() string {
+	if x != nil {
+		return x.ServerName
+	}
+	return ""
+}
+
+func (x *Config) GetNextProtocol() []string {
+	if x != nil {
+		return x.NextProtocol
+	}
+	return nil
+}
+
+func (x *Config) GetDisableSessionResumption() bool {
+	if x != nil {
+		return x.DisableSessionResumption
+	}
+	return false
+}
+
+func (x *Config) GetDisableSystemRoot() bool {
+	if x != nil {
+		return x.DisableSystemRoot
+	}
+	return false
+}
+
+var File_transport_internet_xtls_config_proto protoreflect.FileDescriptor
+
+var file_transport_internet_xtls_config_proto_rawDesc = []byte{
+	0x0a, 0x24, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2f, 0x69, 0x6e, 0x74, 0x65,
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+	0x65, 0x2e, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x49, 0x6e, 0x74, 0x65,
+	0x72, 0x6e, 0x65, 0x74, 0x2e, 0x58, 0x74, 0x6c, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f,
+	0x33,
+}
+
+var (
+	file_transport_internet_xtls_config_proto_rawDescOnce sync.Once
+	file_transport_internet_xtls_config_proto_rawDescData = file_transport_internet_xtls_config_proto_rawDesc
+)
+
+func file_transport_internet_xtls_config_proto_rawDescGZIP() []byte {
+	file_transport_internet_xtls_config_proto_rawDescOnce.Do(func() {
+		file_transport_internet_xtls_config_proto_rawDescData = protoimpl.X.CompressGZIP(file_transport_internet_xtls_config_proto_rawDescData)
+	})
+	return file_transport_internet_xtls_config_proto_rawDescData
+}
+
+var file_transport_internet_xtls_config_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
+var file_transport_internet_xtls_config_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
+var file_transport_internet_xtls_config_proto_goTypes = []interface{}{
+	(Certificate_Usage)(0), // 0: v2ray.core.transport.internet.xtls.Certificate.Usage
+	(*Certificate)(nil),    // 1: v2ray.core.transport.internet.xtls.Certificate
+	(*Config)(nil),         // 2: v2ray.core.transport.internet.xtls.Config
+}
+var file_transport_internet_xtls_config_proto_depIdxs = []int32{
+	0, // 0: v2ray.core.transport.internet.xtls.Certificate.usage:type_name -> v2ray.core.transport.internet.xtls.Certificate.Usage
+	1, // 1: v2ray.core.transport.internet.xtls.Config.certificate:type_name -> v2ray.core.transport.internet.xtls.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
+}
+
+func init() { file_transport_internet_xtls_config_proto_init() }
+func file_transport_internet_xtls_config_proto_init() {
+	if File_transport_internet_xtls_config_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_transport_internet_xtls_config_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Certificate); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_transport_internet_xtls_config_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Config); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_transport_internet_xtls_config_proto_rawDesc,
+			NumEnums:      1,
+			NumMessages:   2,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_transport_internet_xtls_config_proto_goTypes,
+		DependencyIndexes: file_transport_internet_xtls_config_proto_depIdxs,
+		EnumInfos:         file_transport_internet_xtls_config_proto_enumTypes,
+		MessageInfos:      file_transport_internet_xtls_config_proto_msgTypes,
+	}.Build()
+	File_transport_internet_xtls_config_proto = out.File
+	file_transport_internet_xtls_config_proto_rawDesc = nil
+	file_transport_internet_xtls_config_proto_goTypes = nil
+	file_transport_internet_xtls_config_proto_depIdxs = nil
+}

transport/internet/xtls/config.proto

@@ -0,0 +1,46 @@
+syntax = "proto3";
+
+package v2ray.core.transport.internet.xtls;
+option csharp_namespace = "V2Ray.Core.Transport.Internet.Xtls";
+option go_package = "v2ray.com/core/transport/internet/xtls";
+option java_package = "com.v2ray.core.transport.internet.xtls";
+option java_multiple_files = true;
+
+message Certificate {
+  // XTLS certificate in x509 format.
+  bytes Certificate = 1;
+
+  // XTLS key in x509 format.
+  bytes Key = 2;
+
+  enum Usage {
+    ENCIPHERMENT = 0;
+    AUTHORITY_VERIFY = 1;
+    AUTHORITY_ISSUE = 2;
+  }
+
+  Usage usage = 3;
+}
+
+message Config {
+  // Whether or not to allow self-signed certificates.
+  bool allow_insecure = 1;
+
+  // Whether or not to allow insecure cipher suites.
+  bool allow_insecure_ciphers = 5;
+
+  // List of certificates to be served on server.
+  repeated Certificate certificate = 2;
+
+  // Override server name.
+  string server_name = 3;
+
+  // Lists of string as ALPN values.
+  repeated string next_protocol = 4;
+
+  // Whether or not to disable session (ticket) resumption.
+  bool disable_session_resumption = 6;
+
+  // If true, root certificates on the system will not be loaded for verification.
+  bool disable_system_root = 7;
+}

transport/internet/xtls/config_other.go

@@ -0,0 +1,53 @@
+// +build !windows
+// +build !confonly
+
+package xtls
+
+import (
+	"crypto/x509"
+	"sync"
+)
+
+type rootCertsCache struct {
+	sync.Mutex
+	pool *x509.CertPool
+}
+
+func (c *rootCertsCache) load() (*x509.CertPool, error) {
+	c.Lock()
+	defer c.Unlock()
+
+	if c.pool != nil {
+		return c.pool, nil
+	}
+
+	pool, err := x509.SystemCertPool()
+	if err != nil {
+		return nil, err
+	}
+	c.pool = pool
+	return pool, nil
+}
+
+var rootCerts rootCertsCache
+
+func (c *Config) getCertPool() (*x509.CertPool, error) {
+	if c.DisableSystemRoot {
+		return c.loadSelfCertPool()
+	}
+
+	if len(c.Certificate) == 0 {
+		return rootCerts.load()
+	}
+
+	pool, err := x509.SystemCertPool()
+	if err != nil {
+		return nil, newError("system root").AtWarning().Base(err)
+	}
+	for _, cert := range c.Certificate {
+		if !pool.AppendCertsFromPEM(cert.Certificate) {
+			return nil, newError("append cert to root").AtWarning().Base(err)
+		}
+	}
+	return pool, err
+}

transport/internet/xtls/config_test.go

@@ -0,0 +1,100 @@
+package xtls_test
+
+import (
+	"crypto/x509"
+	"testing"
+	"time"
+
+	xtls "github.com/xtls/go"
+
+	"v2ray.com/core/common"
+	"v2ray.com/core/common/protocol/tls/cert"
+	. "v2ray.com/core/transport/internet/xtls"
+)
+
+func TestCertificateIssuing(t *testing.T) {
+	certificate := ParseCertificate(cert.MustGenerate(nil, cert.Authority(true), cert.KeyUsage(x509.KeyUsageCertSign)))
+	certificate.Usage = Certificate_AUTHORITY_ISSUE
+
+	c := &Config{
+		Certificate: []*Certificate{
+			certificate,
+		},
+	}
+
+	xtlsConfig := c.GetXTLSConfig()
+	v2rayCert, err := xtlsConfig.GetCertificate(&xtls.ClientHelloInfo{
+		ServerName: "www.v2fly.org",
+	})
+	common.Must(err)
+
+	x509Cert, err := x509.ParseCertificate(v2rayCert.Certificate[0])
+	common.Must(err)
+	if !x509Cert.NotAfter.After(time.Now()) {
+		t.Error("NotAfter: ", x509Cert.NotAfter)
+	}
+}
+
+func TestExpiredCertificate(t *testing.T) {
+	caCert := cert.MustGenerate(nil, cert.Authority(true), cert.KeyUsage(x509.KeyUsageCertSign))
+	expiredCert := cert.MustGenerate(caCert, cert.NotAfter(time.Now().Add(time.Minute*-2)), cert.CommonName("www.v2fly.org"), cert.DNSNames("www.v2fly.org"))
+
+	certificate := ParseCertificate(caCert)
+	certificate.Usage = Certificate_AUTHORITY_ISSUE
+
+	certificate2 := ParseCertificate(expiredCert)
+
+	c := &Config{
+		Certificate: []*Certificate{
+			certificate,
+			certificate2,
+		},
+	}
+
+	xtlsConfig := c.GetXTLSConfig()
+	v2rayCert, err := xtlsConfig.GetCertificate(&xtls.ClientHelloInfo{
+		ServerName: "www.v2fly.org",
+	})
+	common.Must(err)
+
+	x509Cert, err := x509.ParseCertificate(v2rayCert.Certificate[0])
+	common.Must(err)
+	if !x509Cert.NotAfter.After(time.Now()) {
+		t.Error("NotAfter: ", x509Cert.NotAfter)
+	}
+}
+
+func TestInsecureCertificates(t *testing.T) {
+	c := &Config{
+		AllowInsecureCiphers: true,
+	}
+
+	xtlsConfig := c.GetXTLSConfig()
+	if len(xtlsConfig.CipherSuites) > 0 {
+		t.Fatal("Unexpected tls cipher suites list: ", xtlsConfig.CipherSuites)
+	}
+}
+
+func BenchmarkCertificateIssuing(b *testing.B) {
+	certificate := ParseCertificate(cert.MustGenerate(nil, cert.Authority(true), cert.KeyUsage(x509.KeyUsageCertSign)))
+	certificate.Usage = Certificate_AUTHORITY_ISSUE
+
+	c := &Config{
+		Certificate: []*Certificate{
+			certificate,
+		},
+	}
+
+	xtlsConfig := c.GetXTLSConfig()
+	lenCerts := len(xtlsConfig.Certificates)
+
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		_, _ = xtlsConfig.GetCertificate(&xtls.ClientHelloInfo{
+			ServerName: "www.v2fly.org",
+		})
+		delete(xtlsConfig.NameToCertificate, "www.v2fly.org")
+		xtlsConfig.Certificates = xtlsConfig.Certificates[:lenCerts]
+	}
+}

transport/internet/xtls/config_windows.go

@@ -0,0 +1,14 @@
+// +build windows
+// +build !confonly
+
+package xtls
+
+import "crypto/x509"
+
+func (c *Config) getCertPool() (*x509.CertPool, error) {
+	if c.DisableSystemRoot {
+		return c.loadSelfCertPool()
+	}
+
+	return nil, nil
+}

transport/internet/xtls/errors.generated.go

@@ -0,0 +1,9 @@
+package xtls
+
+import "v2ray.com/core/common/errors"
+
+type errPathObjHolder struct{}
+
+func newError(values ...interface{}) *errors.Error {
+	return errors.New(values...).WithPathObj(errPathObjHolder{})
+}

transport/internet/xtls/xtls.go

@@ -0,0 +1,50 @@
+// +build !confonly
+
+package xtls
+
+import (
+	xtls "github.com/xtls/go"
+
+	"v2ray.com/core/common/buf"
+	"v2ray.com/core/common/net"
+)
+
+//go:generate errorgen
+
+var (
+	_ buf.Writer = (*Conn)(nil)
+)
+
+type Conn struct {
+	*xtls.Conn
+}
+
+func (c *Conn) WriteMultiBuffer(mb buf.MultiBuffer) error {
+	mb = buf.Compact(mb)
+	mb, err := buf.WriteMultiBuffer(c, mb)
+	buf.ReleaseMulti(mb)
+	return err
+}
+
+func (c *Conn) HandshakeAddress() net.Address {
+	if err := c.Handshake(); err != nil {
+		return nil
+	}
+	state := c.ConnectionState()
+	if state.ServerName == "" {
+		return nil
+	}
+	return net.ParseAddress(state.ServerName)
+}
+
+// Client initiates a XTLS client handshake on the given connection.
+func Client(c net.Conn, config *xtls.Config) net.Conn {
+	xtlsConn := xtls.Client(c, config)
+	return &Conn{Conn: xtlsConn}
+}
+
+// Server initiates a XTLS server handshake on the given connection.
+func Server(c net.Conn, config *xtls.Config) net.Conn {
+	xtlsConn := xtls.Server(c, config)
+	return &Conn{Conn: xtlsConn}
+}