From 81d993158fc3907e73737735e15808018baf6f3b Mon Sep 17 00:00:00 2001
From: eMeab <32988354+eMeab@users.noreply.github.com>
Date: Fri, 12 Feb 2021 23:33:19 +0800
Subject: [PATCH] Support hot reloading of certificate and key files (#225)

---
 infra/conf/transport_internet.go     |   4 +
 transport/internet/tls/config.go     |  43 +++++++++--
 transport/internet/tls/config.pb.go  | 108 +++++++++++++++-----------
 transport/internet/tls/config.proto  |   6 ++
 transport/internet/xtls/config.go    |  43 +++++++++--
 transport/internet/xtls/config.pb.go | 110 ++++++++++++++++-----------
 transport/internet/xtls/config.proto |   6 ++
 7 files changed, 221 insertions(+), 99 deletions(-)

diff --git a/infra/conf/transport_internet.go b/infra/conf/transport_internet.go
index adaec4ed..50610cc3 100644
--- a/infra/conf/transport_internet.go
+++ b/infra/conf/transport_internet.go
@@ -264,6 +264,7 @@ func (c *TLSCertConfig) Build() (*tls.Certificate, error) {
 		return nil, newError("failed to parse certificate").Base(err)
 	}
 	certificate.Certificate = cert
+	certificate.CertificatePath = c.CertFile
 
 	if len(c.KeyFile) > 0 || len(c.KeyStr) > 0 {
 		key, err := readFileOrString(c.KeyFile, c.KeyStr)
@@ -271,6 +272,7 @@ func (c *TLSCertConfig) Build() (*tls.Certificate, error) {
 			return nil, newError("failed to parse key").Base(err)
 		}
 		certificate.Key = key
+		certificate.KeyPath = c.KeyFile
 	}
 
 	switch strings.ToLower(c.Usage) {
@@ -348,6 +350,7 @@ func (c *XTLSCertConfig) Build() (*xtls.Certificate, error) {
 		return nil, newError("failed to parse certificate").Base(err)
 	}
 	certificate.Certificate = cert
+	certificate.CertificatePath = c.CertFile
 
 	if len(c.KeyFile) > 0 || len(c.KeyStr) > 0 {
 		key, err := readFileOrString(c.KeyFile, c.KeyStr)
@@ -355,6 +358,7 @@ func (c *XTLSCertConfig) Build() (*xtls.Certificate, error) {
 			return nil, newError("failed to parse key").Base(err)
 		}
 		certificate.Key = key
+		certificate.KeyPath = c.KeyFile
 	}
 
 	switch strings.ToLower(c.Usage) {
diff --git a/transport/internet/tls/config.go b/transport/internet/tls/config.go
index 9df57b84..e9088778 100644
--- a/transport/internet/tls/config.go
+++ b/transport/internet/tls/config.go
@@ -9,6 +9,7 @@ import (
 
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/ocsp"
+	"github.com/xtls/xray-core/common/platform/filesystem"
 	"github.com/xtls/xray-core/common/protocol/tls/cert"
 	"github.com/xtls/xray-core/transport/internet"
 )
@@ -60,17 +61,47 @@ func (c *Config) BuildCertificates() []*tls.Certificate {
 		}
 		certs = append(certs, &keyPair)
 		if entry.OcspStapling != 0 {
-			go func(cert *tls.Certificate) {
+			index := len(certs) - 1
+			go func(cert *tls.Certificate, index int) {
 				t := time.NewTicker(time.Duration(entry.OcspStapling) * time.Second)
 				for {
-					if newData, err := ocsp.GetOCSPForCert(cert.Certificate); err != nil {
-						newError("ignoring invalid OCSP").Base(err).AtWarning().WriteToLog()
-					} else if string(newData) != string(cert.OCSPStaple) {
-						cert.OCSPStaple = newData
+					if entry.CertificatePath != "" && entry.KeyPath != "" {
+						newCert, err := filesystem.ReadFile(entry.CertificatePath)
+						if err != nil {
+							newError("failed to parse certificate").Base(err).AtError().WriteToLog()
+							<-t.C
+							continue
+						}
+						newKey, err := filesystem.ReadFile(entry.KeyPath)
+						if err != nil {
+							newError("failed to parse key").Base(err).AtError().WriteToLog()
+							<-t.C
+							continue
+						}
+						if string(newCert) != string(entry.Certificate) && string(newKey) != string(entry.Key) {
+							newKeyPair, err := tls.X509KeyPair(newCert, newKey)
+							if err != nil {
+								newError("ignoring invalid X509 key pair").Base(err).AtError().WriteToLog()
+								<-t.C
+								continue
+							}
+							if newKeyPair.Leaf, err = x509.ParseCertificate(newKeyPair.Certificate[0]); err != nil {
+								newError("ignoring invalid certificate").Base(err).AtError().WriteToLog()
+								<-t.C
+								continue
+							}
+							cert = &newKeyPair
+						}
 					}
+					if newOCSPData, err := ocsp.GetOCSPForCert(cert.Certificate); err != nil {
+						newError("ignoring invalid OCSP").Base(err).AtWarning().WriteToLog()
+					} else if string(newOCSPData) != string(cert.OCSPStaple) {
+						cert.OCSPStaple = newOCSPData
+					}
+					certs[index] = cert
 					<-t.C
 				}
-			}(certs[len(certs)-1])
+			}(certs[len(certs)-1], index)
 		}
 	}
 	return certs
diff --git a/transport/internet/tls/config.pb.go b/transport/internet/tls/config.pb.go
index c2425cd1..9e550ed1 100644
--- a/transport/internet/tls/config.pb.go
+++ b/transport/internet/tls/config.pb.go
@@ -85,6 +85,10 @@ type Certificate struct {
 	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=ocsp_stapling,json=ocspStapling,proto3" json:"ocsp_stapling,omitempty"`
+	// TLS certificate path
+	CertificatePath string `protobuf:"bytes,5,opt,name=certificate_path,json=certificatePath,proto3" json:"certificate_path,omitempty"`
+	// TLS Key path
+	KeyPath string `protobuf:"bytes,6,opt,name=key_path,json=keyPath,proto3" json:"key_path,omitempty"`
 }
 
 func (x *Certificate) Reset() {
@@ -147,6 +151,20 @@ func (x *Certificate) GetOcspStapling() int64 {
 	return 0
 }
 
+func (x *Certificate) GetCertificatePath() string {
+	if x != nil {
+		return x.CertificatePath
+	}
+	return ""
+}
+
+func (x *Certificate) GetKeyPath() string {
+	if x != nil {
+		return x.KeyPath
+	}
+	return ""
+}
+
 type Config struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -284,7 +302,7 @@ var file_transport_internet_tls_config_proto_rawDesc = []byte{
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@@ -295,48 +313,52 @@ var file_transport_internet_tls_config_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/transport/internet/tls/config.proto b/transport/internet/tls/config.proto
index 69054734..c795db4e 100644
--- a/transport/internet/tls/config.proto
+++ b/transport/internet/tls/config.proto
@@ -22,6 +22,12 @@ message Certificate {
   Usage usage = 3;
 
   int64 ocsp_stapling = 4;
+
+  // TLS certificate path
+  string certificate_path = 5;
+
+  // TLS Key path
+  string key_path = 6;
 }
 
 message Config {
diff --git a/transport/internet/xtls/config.go b/transport/internet/xtls/config.go
index 3330e3ac..f6fed2d1 100644
--- a/transport/internet/xtls/config.go
+++ b/transport/internet/xtls/config.go
@@ -10,6 +10,7 @@ import (
 
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/ocsp"
+	"github.com/xtls/xray-core/common/platform/filesystem"
 	"github.com/xtls/xray-core/common/protocol/tls/cert"
 	"github.com/xtls/xray-core/transport/internet"
 )
@@ -59,17 +60,47 @@ func (c *Config) BuildCertificates() []*xtls.Certificate {
 		}
 		certs = append(certs, &keyPair)
 		if entry.OcspStapling != 0 {
-			go func(cert *xtls.Certificate) {
+			index := len(certs) - 1
+			go func(cert *xtls.Certificate, index int) {
 				t := time.NewTicker(time.Duration(entry.OcspStapling) * time.Second)
 				for {
-					if newData, err := ocsp.GetOCSPForCert(cert.Certificate); err != nil {
-						newError("ignoring invalid OCSP").Base(err).AtWarning().WriteToLog()
-					} else if string(newData) != string(cert.OCSPStaple) {
-						cert.OCSPStaple = newData
+					if entry.CertificatePath != "" && entry.KeyPath != "" {
+						newCert, err := filesystem.ReadFile(entry.CertificatePath)
+						if err != nil {
+							newError("failed to parse certificate").Base(err).AtError().WriteToLog()
+							<-t.C
+							continue
+						}
+						newKey, err := filesystem.ReadFile(entry.KeyPath)
+						if err != nil {
+							newError("failed to parse key").Base(err).AtError().WriteToLog()
+							<-t.C
+							continue
+						}
+						if string(newCert) != string(entry.Certificate) && string(newKey) != string(entry.Key) {
+							newKeyPair, err := xtls.X509KeyPair(newCert, newKey)
+							if err != nil {
+								newError("ignoring invalid X509 key pair").Base(err).AtError().WriteToLog()
+								<-t.C
+								continue
+							}
+							if newKeyPair.Leaf, err = x509.ParseCertificate(newKeyPair.Certificate[0]); err != nil {
+								newError("ignoring invalid certificate").Base(err).AtError().WriteToLog()
+								<-t.C
+								continue
+							}
+							cert = &newKeyPair
+						}
 					}
+					if newOCSPData, err := ocsp.GetOCSPForCert(cert.Certificate); err != nil {
+						newError("ignoring invalid OCSP").Base(err).AtWarning().WriteToLog()
+					} else if string(newOCSPData) != string(cert.OCSPStaple) {
+						cert.OCSPStaple = newOCSPData
+					}
+					certs[index] = cert
 					<-t.C
 				}
-			}(certs[len(certs)-1])
+			}(certs[len(certs)-1], index)
 		}
 	}
 	return certs
diff --git a/transport/internet/xtls/config.pb.go b/transport/internet/xtls/config.pb.go
index 1159072d..423a28e5 100644
--- a/transport/internet/xtls/config.pb.go
+++ b/transport/internet/xtls/config.pb.go
@@ -85,6 +85,10 @@ type Certificate struct {
 	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=ocsp_stapling,json=ocspStapling,proto3" json:"ocsp_stapling,omitempty"`
+	// TLS certificate path
+	CertificatePath string `protobuf:"bytes,5,opt,name=certificate_path,json=certificatePath,proto3" json:"certificate_path,omitempty"`
+	// TLS Key path
+	KeyPath string `protobuf:"bytes,6,opt,name=key_path,json=keyPath,proto3" json:"key_path,omitempty"`
 }
 
 func (x *Certificate) Reset() {
@@ -147,6 +151,20 @@ func (x *Certificate) GetOcspStapling() int64 {
 	return 0
 }
 
+func (x *Certificate) GetCertificatePath() string {
+	if x != nil {
+		return x.CertificatePath
+	}
+	return ""
+}
+
+func (x *Certificate) GetKeyPath() string {
+	if x != nil {
+		return x.KeyPath
+	}
+	return ""
+}
+
 type Config struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -284,7 +302,7 @@ var file_transport_internet_xtls_config_proto_rawDesc = []byte{
 	0x72, 0x6e, 0x65, 0x74, 0x2f, 0x78, 0x74, 0x6c, 0x73, 0x2f, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67,
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@@ -295,49 +313,53 @@ var file_transport_internet_xtls_config_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/transport/internet/xtls/config.proto b/transport/internet/xtls/config.proto
index 36c10db3..b338a82e 100644
--- a/transport/internet/xtls/config.proto
+++ b/transport/internet/xtls/config.proto
@@ -22,6 +22,12 @@ message Certificate {
   Usage usage = 3;
 
   int64 ocsp_stapling = 4;
+
+  // TLS certificate path
+  string certificate_path = 5;
+
+  // TLS Key path
+  string key_path = 6;
 }
 
 message Config {