From 3d7e86efba7436bc003a7f48fe281c1a9445380c Mon Sep 17 00:00:00 2001 From: eMeab <32988354+eMeab@users.noreply.github.com> Date: Fri, 25 Dec 2020 16:01:20 +0800 Subject: [PATCH] Add OCSP Stapling for TLS & XTLS (#92) --- common/ocsp/errors.generated.go | 9 ++ common/ocsp/ocsp.go | 134 +++++++++++++++++++++++++++ infra/conf/transport_internet.go | 26 +++--- transport/internet/tls/config.go | 22 ++++- transport/internet/tls/config.pb.go | 102 +++++++++++--------- transport/internet/tls/config.proto | 2 + transport/internet/xtls/config.go | 18 +++- transport/internet/xtls/config.pb.go | 103 +++++++++++--------- transport/internet/xtls/config.proto | 2 + 9 files changed, 312 insertions(+), 106 deletions(-) create mode 100644 common/ocsp/errors.generated.go create mode 100644 common/ocsp/ocsp.go diff --git a/common/ocsp/errors.generated.go b/common/ocsp/errors.generated.go new file mode 100644 index 00000000..4bdbc25c --- /dev/null +++ b/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{}) +} diff --git a/common/ocsp/ocsp.go b/common/ocsp/ocsp.go new file mode 100644 index 00000000..5de57870 --- /dev/null +++ b/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 +} diff --git a/infra/conf/transport_internet.go b/infra/conf/transport_internet.go index b914ac19..4c6179eb 100644 --- a/infra/conf/transport_internet.go +++ b/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 } diff --git a/transport/internet/tls/config.go b/transport/internet/tls/config.go index 1238fe8c..14712bf1 100644 --- a/transport/internet/tls/config.go +++ b/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 } diff --git a/transport/internet/tls/config.pb.go b/transport/internet/tls/config.pb.go index 56411b0e..587cc0b9 100644 --- a/transport/internet/tls/config.pb.go +++ b/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 @@ 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+20,8 @@ message Certificate { } Usage usage = 3; + + int64 ocspStapling = 4; } message Config { diff --git a/transport/internet/xtls/config.go b/transport/internet/xtls/config.go index 926657ce..4ff36e9a 100644 --- a/transport/internet/xtls/config.go +++ b/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 } diff --git a/transport/internet/xtls/config.pb.go b/transport/internet/xtls/config.pb.go index d8f42a6e..40423318 100644 --- a/transport/internet/xtls/config.pb.go +++ b/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 @@ 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a/transport/internet/xtls/config.proto +++ b/transport/internet/xtls/config.proto @@ -20,6 +20,8 @@ message Certificate { } Usage usage = 3; + + int64 ocspStapling = 4; } message Config {