Add OCSP Stapling for TLS & XTLS (#92)

common/ocsp/errors.generated.go

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

common/ocsp/ocsp.go

@@ -0,0 +1,134 @@
+package ocsp
+
+import (
+	"bytes"
+	"crypto/x509"
+	"encoding/pem"
+	"github.com/xtls/xray-core/common/platform/filesystem"
+	"golang.org/x/crypto/ocsp"
+	"io/ioutil"
+	"net/http"
+	"os"
+)
+
+func GetOCSPForFile(path string) ([]byte, error) {
+	return filesystem.ReadFile(path)
+}
+
+func CheckOCSPFileIsNotExist(path string) bool {
+	_, err := os.Stat(path)
+	if err != nil {
+		return os.IsNotExist(err)
+	}
+	return false
+}
+
+func GetOCSPStapling(cert [][]byte, path string) ([]byte, error) {
+	ocspData, err := GetOCSPForFile(path)
+	if err != nil {
+		ocspData, err = GetOCSPForCert(cert)
+		if !CheckOCSPFileIsNotExist(path) {
+			err = os.Remove(path)
+			if err != nil {
+				return nil, err
+			}
+		}
+		newFile, err := os.Create(path)
+		if err != nil {
+			return nil, err
+		}
+		newFile.Write(ocspData)
+		defer newFile.Close()
+	}
+	return ocspData, nil
+}
+
+func GetOCSPForCert(cert [][]byte) ([]byte, error) {
+	bundle := new(bytes.Buffer)
+	for _, derBytes := range cert {
+		err := pem.Encode(bundle, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
+		if err != nil {
+			return nil, err
+		}
+	}
+	pemBundle := bundle.Bytes()
+
+	certificates, err := parsePEMBundle(pemBundle)
+
+	if err != nil {
+		return nil, err
+	}
+	issuedCert := certificates[0]
+	if len(issuedCert.OCSPServer) == 0 {
+		return nil, newError("no OCSP server specified in cert")
+	}
+	if len(certificates) == 1 {
+		if len(issuedCert.IssuingCertificateURL) == 0 {
+			return nil, newError("no issuing certificate URL")
+		}
+		resp, errC := http.Get(issuedCert.IssuingCertificateURL[0])
+		if errC != nil {
+			return nil, newError("no issuing certificate URL")
+		}
+		defer resp.Body.Close()
+
+		issuerBytes, errC := ioutil.ReadAll(resp.Body)
+		if errC != nil {
+			return nil, newError(errC)
+		}
+
+		issuerCert, errC := x509.ParseCertificate(issuerBytes)
+		if errC != nil {
+			return nil, newError(errC)
+		}
+
+		certificates = append(certificates, issuerCert)
+	}
+	issuerCert := certificates[1]
+
+	ocspReq, err := ocsp.CreateRequest(issuedCert, issuerCert, nil)
+	if err != nil {
+		return nil, err
+	}
+	reader := bytes.NewReader(ocspReq)
+	req, err := http.Post(issuedCert.OCSPServer[0], "application/ocsp-request", reader)
+	if err != nil {
+		return nil, newError(err)
+	}
+	defer req.Body.Close()
+	ocspResBytes, err := ioutil.ReadAll(req.Body)
+
+	if err != nil {
+		return nil, newError(err)
+	}
+	return ocspResBytes, nil
+
+}
+
+// parsePEMBundle parses a certificate bundle from top to bottom and returns
+// a slice of x509 certificates. This function will error if no certificates are found.
+func parsePEMBundle(bundle []byte) ([]*x509.Certificate, error) {
+	var certificates []*x509.Certificate
+	var certDERBlock *pem.Block
+
+	for {
+		certDERBlock, bundle = pem.Decode(bundle)
+		if certDERBlock == nil {
+			break
+		}
+
+		if certDERBlock.Type == "CERTIFICATE" {
+			cert, err := x509.ParseCertificate(certDERBlock.Bytes)
+			if err != nil {
+				return nil, err
+			}
+			certificates = append(certificates, cert)
+		}
+	}
+
+	if len(certificates) == 0 {
+		return nil, newError("no certificates were found while parsing the bundle")
+	}
+
+	return certificates, nil
+}

infra/conf/transport_internet.go

@@ -247,11 +247,12 @@ func readFileOrString(f string, s []string) ([]byte, error) {
 }
 
 type TLSCertConfig struct {
-	CertFile string   `json:"certificateFile"`
-	CertStr  []string `json:"certificate"`
-	KeyFile  string   `json:"keyFile"`
-	KeyStr   []string `json:"key"`
-	Usage    string   `json:"usage"`
+	CertFile     string   `json:"certificateFile"`
+	CertStr      []string `json:"certificate"`
+	KeyFile      string   `json:"keyFile"`
+	KeyStr       []string `json:"key"`
+	Usage        string   `json:"usage"`
+	OcspStapling int64    `json:"ocspStapling"`
 }
 
 // Build implements Buildable.
@@ -282,7 +283,7 @@ func (c *TLSCertConfig) Build() (*tls.Certificate, error) {
 	default:
 		certificate.Usage = tls.Certificate_ENCIPHERMENT
 	}
-
+	certificate.OcspStapling = c.OcspStapling
 	return certificate, nil
 }
 
@@ -328,11 +329,12 @@ func (c *TLSConfig) Build() (proto.Message, error) {
 }
 
 type XTLSCertConfig struct {
-	CertFile string   `json:"certificateFile"`
-	CertStr  []string `json:"certificate"`
-	KeyFile  string   `json:"keyFile"`
-	KeyStr   []string `json:"key"`
-	Usage    string   `json:"usage"`
+	CertFile     string   `json:"certificateFile"`
+	CertStr      []string `json:"certificate"`
+	KeyFile      string   `json:"keyFile"`
+	KeyStr       []string `json:"key"`
+	Usage        string   `json:"usage"`
+	OcspStapling int64    `json:"ocspStapling"`
 }
 
 // Build implements Buildable.
@@ -363,7 +365,7 @@ func (c *XTLSCertConfig) Build() (*xtls.Certificate, error) {
 	default:
 		certificate.Usage = xtls.Certificate_ENCIPHERMENT
 	}
-
+	certificate.OcspStapling = c.OcspStapling
 	return certificate, nil
 }
 

transport/internet/tls/config.go

@@ -1,8 +1,10 @@
 package tls
 
 import (
+	"bytes"
 	"crypto/tls"
 	"crypto/x509"
+	"github.com/xtls/xray-core/common/ocsp"
 	"strings"
 	"sync"
 	"time"
@@ -43,7 +45,7 @@ func (c *Config) loadSelfCertPool() (*x509.CertPool, error) {
 // BuildCertificates builds a list of TLS certificates from proto definition.
 func (c *Config) BuildCertificates() []tls.Certificate {
 	certs := make([]tls.Certificate, 0, len(c.Certificate))
-	for _, entry := range c.Certificate {
+	for i, entry := range c.Certificate {
 		if entry.Usage != Certificate_ENCIPHERMENT {
 			continue
 		}
@@ -53,6 +55,24 @@ func (c *Config) BuildCertificates() []tls.Certificate {
 			continue
 		}
 		certs = append(certs, keyPair)
+		if entry.OcspStapling != 0 {
+			*&certs[i].OCSPStaple, _ = ocsp.GetOCSPForCert(keyPair.Certificate)
+			go func(ocspData *[]byte) {
+				t := time.NewTicker(time.Second * time.Duration(entry.OcspStapling))
+				for {
+					select {
+					case <-t.C:
+						newOCSPData, err := ocsp.GetOCSPForCert(keyPair.Certificate)
+						if err != nil {
+							newError("ignoring invalid OCSP").Base(err).AtWarning().WriteToLog()
+						}
+						if len(newOCSPData) != len(*ocspData) && !bytes.Equal(*ocspData, newOCSPData) {
+							*ocspData = newOCSPData
+						}
+					}
+				}
+			}(&certs[i].OCSPStaple)
+		}
 	}
 	return certs
 }

transport/internet/tls/config.pb.go

@@ -82,8 +82,9 @@ type Certificate struct {
 	// TLS certificate in x509 format.
 	Certificate []byte `protobuf:"bytes,1,opt,name=Certificate,proto3" json:"Certificate,omitempty"`
 	// TLS 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=xray.transport.internet.tls.Certificate_Usage" json:"usage,omitempty"`
+	Key          []byte            `protobuf:"bytes,2,opt,name=Key,proto3" json:"Key,omitempty"`
+	Usage        Certificate_Usage `protobuf:"varint,3,opt,name=usage,proto3,enum=xray.transport.internet.tls.Certificate_Usage" json:"usage,omitempty"`
+	OcspStapling int64             `protobuf:"varint,4,opt,name=ocspStapling,proto3" json:"ocspStapling,omitempty"`
 }
 
 func (x *Certificate) Reset() {
@@ -139,6 +140,13 @@ func (x *Certificate) GetUsage() Certificate_Usage {
 	return Certificate_ENCIPHERMENT
 }
 
+func (x *Certificate) GetOcspStapling() int64 {
+	if x != nil {
+		return x.OcspStapling
+	}
+	return 0
+}
+
 type Config struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -276,7 +284,7 @@ var file_transport_internet_tls_config_proto_rawDesc = []byte{
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 }
 
 var (

transport/internet/tls/config.proto

@@ -20,6 +20,8 @@ message Certificate {
   }
 
   Usage usage = 3;
+
+  int64 ocspStapling = 4;
 }
 
 message Config {

transport/internet/xtls/config.go

@@ -2,6 +2,7 @@ package xtls
 
 import (
 	"crypto/x509"
+	"github.com/xtls/xray-core/common/ocsp"
 	"strings"
 	"sync"
 	"time"
@@ -42,7 +43,7 @@ func (c *Config) loadSelfCertPool() (*x509.CertPool, error) {
 // 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 {
+	for i, entry := range c.Certificate {
 		if entry.Usage != Certificate_ENCIPHERMENT {
 			continue
 		}
@@ -52,6 +53,21 @@ func (c *Config) BuildCertificates() []xtls.Certificate {
 			continue
 		}
 		certs = append(certs, keyPair)
+		if entry.OcspStapling != 0 {
+			*&certs[i].OCSPStaple, _ = ocsp.GetOCSPForCert(keyPair.Certificate)
+			go func(ocspData *[]byte) {
+				t := time.NewTicker(time.Second * time.Duration(entry.OcspStapling))
+				for {
+					select {
+					case <-t.C:
+						*ocspData, err = ocsp.GetOCSPForCert(keyPair.Certificate)
+						if err != nil {
+							newError("ignoring invalid OCSP").Base(err).AtWarning().WriteToLog()
+						}
+					}
+				}
+			}(&certs[i].OCSPStaple)
+		}
 	}
 	return certs
 }

transport/internet/xtls/config.pb.go

@@ -82,8 +82,9 @@ type Certificate struct {
 	// TLS certificate in x509 format.
 	Certificate []byte `protobuf:"bytes,1,opt,name=Certificate,proto3" json:"Certificate,omitempty"`
 	// TLS 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=xray.transport.internet.xtls.Certificate_Usage" json:"usage,omitempty"`
+	Key          []byte            `protobuf:"bytes,2,opt,name=Key,proto3" json:"Key,omitempty"`
+	Usage        Certificate_Usage `protobuf:"varint,3,opt,name=usage,proto3,enum=xray.transport.internet.xtls.Certificate_Usage" json:"usage,omitempty"`
+	OcspStapling int64             `protobuf:"varint,4,opt,name=ocspStapling,proto3" json:"ocspStapling,omitempty"`
 }
 
 func (x *Certificate) Reset() {
@@ -139,6 +140,13 @@ func (x *Certificate) GetUsage() Certificate_Usage {
 	return Certificate_ENCIPHERMENT
 }
 
+func (x *Certificate) GetOcspStapling() int64 {
+	if x != nil {
+		return x.OcspStapling
+	}
+	return 0
+}
+
 type Config struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -276,7 +284,7 @@ var file_transport_internet_xtls_config_proto_rawDesc = []byte{
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@@ -284,49 +292,52 @@ var file_transport_internet_xtls_config_proto_rawDesc = []byte{
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 }
 
 var (

transport/internet/xtls/config.proto

@@ -20,6 +20,8 @@ message Certificate {
   }
 
   Usage usage = 3;
+
+  int64 ocspStapling = 4;
 }
 
 message Config {