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tls_cert.go
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tls_cert.go
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// Copyright 2023 Ant Group Co., Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package interceptor
import (
"context"
"crypto/x509/pkix"
"github.com/gin-gonic/gin"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/peer"
)
var grpcTLSCertKey struct{}
// TLSCertFromGRPCContext get tls cert info from grpc context.
func TLSCertFromGRPCContext(ctx context.Context) (p *pkix.Name) {
p, ok := ctx.Value(grpcTLSCertKey).(*pkix.Name)
if !ok {
return nil
}
return p
}
func newTLSCertContext(ctx context.Context, tlsCert *pkix.Name) context.Context {
if tlsCert != nil {
return context.WithValue(ctx, grpcTLSCertKey, tlsCert)
}
return ctx
}
// GRPCTLSCertInfoInterceptor is an interceptor for grpc.It catches tls cert info from grpc context.Context, and you can get tls cert info by TLSCertFromGRPCContext.
func GRPCTLSCertInfoInterceptor(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
certInfoFromContext := func(ctx context.Context) *pkix.Name {
if p, ok := peer.FromContext(ctx); ok {
if tlsInfo, ok := p.AuthInfo.(credentials.TLSInfo); ok {
if len(tlsInfo.State.VerifiedChains) > 0 && len(tlsInfo.State.VerifiedChains[0]) > 0 {
return &tlsInfo.State.VerifiedChains[0][0].Subject
}
}
}
return nil
}
return handler(newTLSCertContext(ctx, certInfoFromContext(ctx)), req)
}
const (
httpTLSCertKey = "TLSCert"
)
// TLSCertFromGinContext get tls cert info from gin context.
func TLSCertFromGinContext(c *gin.Context) *pkix.Name {
cert, exist := c.Get(httpTLSCertKey)
if !exist {
return nil
}
certPkix := cert.(pkix.Name)
return &certPkix
}
// HTTPTLSCertInfoInterceptor is an interceptor for gin.It catches tls cert info from gin.Context, and you can get tls cert info by TLSCertFromGinContext.
func HTTPTLSCertInfoInterceptor(c *gin.Context) {
if c.Request.TLS != nil && len(c.Request.TLS.VerifiedChains) > 0 && len(c.Request.TLS.VerifiedChains[0]) > 0 {
c.Set(httpTLSCertKey, c.Request.TLS.VerifiedChains[0][0].Subject)
}
c.Next()
}