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Refactor certificate pinning

cert-pin
风扇滑翔翼 2025-09-16 08:20:43 +00:00 committed by GitHub
parent fe57507fd9
commit 6bc12448d8
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
5 changed files with 176 additions and 131 deletions
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102
transport/internet/tls/config.go
View File

@ -282,6 +282,36 @@ func (c *Config) parseServerName() string {
} }
func (r *RandCarrier) verifyPeerCert(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error { func (r *RandCarrier) verifyPeerCert(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error {
// pinned chain has the highest priority
// pass if successfull and fail if not
if r.PinnedPeerCertificateChainSha256 != nil {
hashValue := GenerateCertChainHash(rawCerts)
for _, v := range r.PinnedPeerCertificateChainSha256 {
if hmac.Equal(hashValue, v) {
return nil
}
}
return errors.New("peer cert is unrecognized: ", base64.StdEncoding.EncodeToString(hashValue))
}
// directly return success if pinned cert is leaf
// or add the CA to RootCAs if pinned cert is CA(and can be used in VerifyPeerCertInNames for Self signed CA)
RootCAs := r.RootCAs
if r.PinnedPeerCertificateSha256 != nil {
verifyResult, verifiedCert := verifyChain(verifiedChains, r.PinnedPeerCertificateSha256)
switch verifyResult {
case certNotFound:
return errors.New("peer cert is unrecognized")
case foundLeaf:
return nil
case foundCA:
RootCAs = RootCAs.Clone()
RootCAs.AddCert(verifiedCert)
default:
panic("impossible PinnedPeerCertificateSha256 verify result")
}
}
if r.VerifyPeerCertInNames != nil { if r.VerifyPeerCertInNames != nil {
if len(r.VerifyPeerCertInNames) > 0 { if len(r.VerifyPeerCertInNames) > 0 {
certs := make([]*x509.Certificate, len(rawCerts)) certs := make([]*x509.Certificate, len(rawCerts))
@ -289,7 +319,7 @@ func (r *RandCarrier) verifyPeerCert(rawCerts [][]byte, verifiedChains [][]*x509
certs[i], _ = x509.ParseCertificate(asn1Data) certs[i], _ = x509.ParseCertificate(asn1Data)
} }
opts := x509.VerifyOptions{ opts := x509.VerifyOptions{
Roots: r.RootCAs, Roots: RootCAs,
CurrentTime: time.Now(), CurrentTime: time.Now(),
Intermediates: x509.NewCertPool(), Intermediates: x509.NewCertPool(),
} }
@ -302,42 +332,15 @@ func (r *RandCarrier) verifyPeerCert(rawCerts [][]byte, verifiedChains [][]*x509
} }
} }
} }
if r.PinnedPeerCertificateChainSha256 == nil {
return errors.New("peer cert is invalid.")
}
}
if r.PinnedPeerCertificateChainSha256 != nil {
hashValue := GenerateCertChainHash(rawCerts)
for _, v := range r.PinnedPeerCertificateChainSha256 {
if hmac.Equal(hashValue, v) {
return nil
}
}
return errors.New("peer cert is unrecognized: ", base64.StdEncoding.EncodeToString(hashValue))
}
if r.PinnedPeerCertificatePublicKeySha256 != nil {
for _, v := range verifiedChains {
for _, cert := range v {
publicHash := GenerateCertPublicKeyHash(cert)
for _, c := range r.PinnedPeerCertificatePublicKeySha256 {
if hmac.Equal(publicHash, c) {
return nil
}
}
}
}
return errors.New("peer public key is unrecognized.")
} }
return nil return nil
} }
type RandCarrier struct { type RandCarrier struct {
RootCAs *x509.CertPool RootCAs *x509.CertPool
VerifyPeerCertInNames []string VerifyPeerCertInNames []string
PinnedPeerCertificateChainSha256 [][]byte PinnedPeerCertificateChainSha256 [][]byte
PinnedPeerCertificatePublicKeySha256 [][]byte PinnedPeerCertificateSha256 [][]byte
} }
func (r *RandCarrier) Read(p []byte) (n int, err error) { func (r *RandCarrier) Read(p []byte) (n int, err error) {
@ -362,10 +365,10 @@ func (c *Config) GetTLSConfig(opts ...Option) *tls.Config {
} }
randCarrier := &RandCarrier{ randCarrier := &RandCarrier{
RootCAs: root, RootCAs: root,
VerifyPeerCertInNames: slices.Clone(c.VerifyPeerCertInNames), VerifyPeerCertInNames: slices.Clone(c.VerifyPeerCertInNames),
PinnedPeerCertificateChainSha256: c.PinnedPeerCertificateChainSha256, PinnedPeerCertificateChainSha256: c.PinnedPeerCertificateChainSha256,
PinnedPeerCertificatePublicKeySha256: c.PinnedPeerCertificatePublicKeySha256, PinnedPeerCertificateSha256: c.PinnedPeerCertificateSha256,
} }
config := &tls.Config{ config := &tls.Config{
Rand: randCarrier, Rand: randCarrier,
@ -526,3 +529,30 @@ func ParseCurveName(curveNames []string) []tls.CurveID {
func IsFromMitm(str string) bool { func IsFromMitm(str string) bool {
return strings.ToLower(str) == "frommitm" return strings.ToLower(str) == "frommitm"
} }
type verifyResult int
const (
certNotFound verifyResult = iota
foundLeaf
foundCA
)
func verifyChain(verifiedChains [][]*x509.Certificate, PinnedPeerCertificateSha256 [][]byte) (verifyResult, *x509.Certificate) {
for _, v := range verifiedChains {
for _, cert := range v {
certHash := GenerateCertHash(cert)
for _, c := range PinnedPeerCertificateSha256 {
if hmac.Equal(certHash, c) {
if cert.IsCA {
return foundCA, cert
} else {
return foundLeaf, cert
}
}
}
}
}
return certNotFound, nil
}

42
transport/internet/tls/config.pb.go
View File

@ -217,11 +217,12 @@ type Config struct {
// @Document Replaces server_name to verify the peer cert. // @Document Replaces server_name to verify the peer cert.
// @Document After allow_insecure (automatically), if the server's cert can't be verified by any of these names, pinned_peer_certificate_chain_sha256 will be tried. // @Document After allow_insecure (automatically), if the server's cert can't be verified by any of these names, pinned_peer_certificate_chain_sha256 will be tried.
// @Critical // @Critical
VerifyPeerCertInNames []string `protobuf:"bytes,17,rep,name=verify_peer_cert_in_names,json=verifyPeerCertInNames,proto3" json:"verify_peer_cert_in_names,omitempty"` VerifyPeerCertInNames []string `protobuf:"bytes,17,rep,name=verify_peer_cert_in_names,json=verifyPeerCertInNames,proto3" json:"verify_peer_cert_in_names,omitempty"`
EchServerKeys []byte `protobuf:"bytes,18,opt,name=ech_server_keys,json=echServerKeys,proto3" json:"ech_server_keys,omitempty"` EchServerKeys []byte `protobuf:"bytes,18,opt,name=ech_server_keys,json=echServerKeys,proto3" json:"ech_server_keys,omitempty"`
EchConfigList string `protobuf:"bytes,19,opt,name=ech_config_list,json=echConfigList,proto3" json:"ech_config_list,omitempty"` EchConfigList string `protobuf:"bytes,19,opt,name=ech_config_list,json=echConfigList,proto3" json:"ech_config_list,omitempty"`
EchForceQuery string `protobuf:"bytes,20,opt,name=ech_force_query,json=echForceQuery,proto3" json:"ech_force_query,omitempty"` EchForceQuery string `protobuf:"bytes,20,opt,name=ech_force_query,json=echForceQuery,proto3" json:"ech_force_query,omitempty"`
EchSocketSettings *internet.SocketConfig `protobuf:"bytes,21,opt,name=ech_socket_settings,json=echSocketSettings,proto3" json:"ech_socket_settings,omitempty"` EchSocketSettings *internet.SocketConfig `protobuf:"bytes,21,opt,name=ech_socket_settings,json=echSocketSettings,proto3" json:"ech_socket_settings,omitempty"`
PinnedPeerCertificateSha256 [][]byte `protobuf:"bytes,22,rep,name=pinned_peer_certificate_sha256,json=pinnedPeerCertificateSha256,proto3" json:"pinned_peer_certificate_sha256,omitempty"`
} }
func (x *Config) Reset() { func (x *Config) Reset() {
@ -394,6 +395,13 @@ func (x *Config) GetEchSocketSettings() *internet.SocketConfig {
return nil return nil
} }
func (x *Config) GetPinnedPeerCertificateSha256() [][]byte {
if x != nil {
return x.PinnedPeerCertificateSha256
}
return nil
}
var File_transport_internet_tls_config_proto protoreflect.FileDescriptor var File_transport_internet_tls_config_proto protoreflect.FileDescriptor
var file_transport_internet_tls_config_proto_rawDesc = []byte{ var file_transport_internet_tls_config_proto_rawDesc = []byte{
@ -427,7 +435,7 @@ var file_transport_internet_tls_config_proto_rawDesc = []byte{
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@ -490,15 +498,19 @@ var file_transport_internet_tls_config_proto_rawDesc = []byte{
0x61, 0x79, 0x2e, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x69, 0x6e, 0x74, 0x61, 0x79, 0x2e, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x69, 0x6e, 0x74,
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} }
var ( var (

2
transport/internet/tls/config.proto
View File

@ -101,4 +101,6 @@ message Config {
string ech_force_query = 20; string ech_force_query = 20;
SocketConfig ech_socket_settings = 21; SocketConfig ech_socket_settings = 21;
repeated bytes pinned_peer_certificate_sha256 = 22;
} }

4
transport/internet/tls/pin.go
View File

@ -36,7 +36,7 @@ func GenerateCertChainHash(rawCerts [][]byte) []byte {
return hashValue return hashValue
} }
func GenerateCertPublicKeyHash(cert *x509.Certificate) []byte { func GenerateCertHash(cert *x509.Certificate) []byte {
out := sha256.Sum256(cert.RawSubjectPublicKeyInfo) out := sha256.Sum256(cert.Raw)
return out[:] return out[:]
} }

157
transport/internet/tls/pin_test.go
View File

@ -2,14 +2,14 @@ package tls
import ( import (
"crypto/x509" "crypto/x509"
"encoding/base64" "encoding/hex"
"encoding/pem" "encoding/pem"
"testing" "testing"
"github.com/stretchr/testify/assert" "github.com/stretchr/testify/assert"
) )
func TestCalculateCertHash(t *testing.T) { func TestCalculateCertChainHash(t *testing.T) {
/* This is used to make sure that the hash signature generated is consistent /* This is used to make sure that the hash signature generated is consistent
Do NOT change this test to suit your modification. Do NOT change this test to suit your modification.
*/ */
@ -112,88 +112,89 @@ tzY45d4mjPs0fKCFKSsVM6YT0tX4NwIKsOaeQg30WLtRyDwYm6ma/a/UUUS0FloZ
}) })
} }
func TestCalculateCertPublicKeyHash(t *testing.T) { func TestCalculateCertHash(t *testing.T) {
const Single = `-----BEGIN CERTIFICATE----- const Single = `-----BEGIN CERTIFICATE-----
MIINWTCCC0GgAwIBAgITLQAxbA/A+lw/1sLDAAAAADFsDzANBgkqhkiG9w0BAQsF MIINWzCCC0OgAwIBAgITMwK6ajqdrV0tahuIrQAAArpqOjANBgkqhkiG9w0BAQwF
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MSAwHgYDVQQDExdNaWNyb3NvZnQgUlNBIFRMUyBDQSAwMjAeFw0yMjExMjUwMDU2 MS4wLAYDVQQDEyVNaWNyb3NvZnQgQXp1cmUgUlNBIFRMUyBJc3N1aW5nIENBIDA0
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-----END CERTIFICATE----- -----END CERTIFICATE-----
` `
t.Run("singlepublickey", func(t *testing.T) { t.Run("singlepublickey", func(t *testing.T) {
block, _ := pem.Decode([]byte(Single)) block, _ := pem.Decode([]byte(Single))
cert, err := x509.ParseCertificate(block.Bytes) cert, err := x509.ParseCertificate(block.Bytes)
assert.Equal(t, err, nil) assert.Equal(t, err, nil)
hash := GenerateCertPublicKeyHash(cert) hash := GenerateCertHash(cert)
hashstr := base64.StdEncoding.EncodeToString(hash) fingerprint, _ := hex.DecodeString("ae243d668ec9c7f74a0dcd1ad21c6676b4efe30c39728934b362093af886bf77")
assert.Equal(t, "xI/4mNm8xF9uDT4vA9G1+aKAaybwNlkRECnN8vGAHTM=", hashstr) assert.Equal(t, fingerprint, hash)
}) })
} }