verify peer cert function for better man in the middle prevention

transport/internet/tls/config.go

@@ -3,8 +3,11 @@
 package tls
 
 import (
+	"crypto/hmac"
+	"crypto/sha256"
 	"crypto/tls"
 	"crypto/x509"
+	"encoding/hex"
 	"strings"
 	"sync"
 	"time"
@@ -170,6 +173,28 @@ func (c *Config) parseServerName() string {
 	return c.ServerName
 }
 
+func (c *Config) verifyPeerCert(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error {
+	if c.PinnedPeerCertificateChainSha256 != nil {
+		var hashValue []byte
+		for _, certValue := range rawCerts {
+			out := sha256.Sum256(certValue)
+			if hashValue == nil {
+				hashValue = out[:]
+			} else {
+				newHashValue := sha256.Sum256(append(hashValue, out[:]...))
+				hashValue = newHashValue[:]
+			}
+		}
+		for _, v := range c.PinnedPeerCertificateChainSha256 {
+			if hmac.Equal(hashValue, v) {
+				return nil
+			}
+		}
+		return newError("peer cert is unrecognized: ", hex.EncodeToString(hashValue))
+	}
+	return nil
+}
+
 // GetTLSConfig converts this Config into tls.Config.
 func (c *Config) GetTLSConfig(opts ...Option) *tls.Config {
 	root, err := c.getCertPool()
@@ -193,6 +218,7 @@ func (c *Config) GetTLSConfig(opts ...Option) *tls.Config {
 		InsecureSkipVerify:     c.AllowInsecure,
 		NextProtos:             c.NextProtocol,
 		SessionTicketsDisabled: !c.EnableSessionResumption,
+		VerifyPeerCertificate:  c.verifyPeerCert,
 	}
 
 	for _, opt := range opts {

transport/internet/tls/config.pb.go

@@ -152,6 +152,11 @@ type Config struct {
 	// If true, root certificates on the system will not be loaded for
 	// verification.
 	DisableSystemRoot bool `protobuf:"varint,6,opt,name=disable_system_root,json=disableSystemRoot,proto3" json:"disable_system_root,omitempty"`
+	// @Document A pinned certificate chain sha256 hash.
+	//@Document If the server's hash does not match this value, the connection will be aborted.
+	//@Document This value replace allow_insecure.
+	//@Critical
+	PinnedPeerCertificateChainSha256 [][]byte `protobuf:"bytes,7,rep,name=pinned_peer_certificate_chain_sha256,json=pinnedPeerCertificateChainSha256,proto3" json:"pinned_peer_certificate_chain_sha256,omitempty"`
 }
 
 func (x *Config) Reset() {
@@ -228,6 +233,13 @@ func (x *Config) GetDisableSystemRoot() bool {
 	return false
 }
 
+func (x *Config) GetPinnedPeerCertificateChainSha256() [][]byte {
+	if x != nil {
+		return x.PinnedPeerCertificateChainSha256
+	}
+	return nil
+}
+
 var File_transport_internet_tls_config_proto protoreflect.FileDescriptor
 
 var file_transport_internet_tls_config_proto_rawDesc = []byte{
@@ -248,8 +260,8 @@ var file_transport_internet_tls_config_proto_rawDesc = []byte{
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@@ -268,7 +280,12 @@ var file_transport_internet_tls_config_proto_rawDesc = []byte{
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transport/internet/tls/config.proto

@@ -41,4 +41,11 @@ message Config {
   // If true, root certificates on the system will not be loaded for
   // verification.
   bool disable_system_root = 6;
+
+  /* @Document A pinned certificate chain sha256 hash.
+     @Document If the server's hash does not match this value, the connection will be aborted.
+     @Document This value replace allow_insecure.
+     @Critical
+  */
+  repeated bytes pinned_peer_certificate_chain_sha256 = 7;
 }