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crl_pool.go
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crl_pool.go
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// Copyright (c) 2019 The BFE Authors.
//
// 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 bfe_tls
import (
"bytes"
"crypto/x509"
"crypto/x509/pkix"
"encoding/asn1"
"encoding/hex"
"errors"
"fmt"
"math/big"
)
var (
oidExtensionAuthorityKeyId = []int{2, 5, 29, 35}
)
// RFC 5280, 4.2.1.1
type authKeyId struct {
Id []byte `asn1:"optional,tag:0"`
}
func unmarshalAuthKeyId(value []byte) (authKeyId, error) {
var a authKeyId
if rest, err := asn1.Unmarshal(value, &a); err != nil {
return a, err
} else if len(rest) != 0 {
return a, errors.New("x509: trailing data after X.509 authority key-id")
}
return a, nil
}
type CRLPool struct {
byIssuerAndSerial map[string]pkix.RevokedCertificate
}
func NewCRLPool() *CRLPool {
crlPool := new(CRLPool)
crlPool.byIssuerAndSerial = make(map[string]pkix.RevokedCertificate)
return crlPool
}
func getAuthorityKeyId(crl *pkix.CertificateList) (authKeyId, error) {
var err error
var a authKeyId
if crl == nil {
return a, fmt.Errorf("crl is nil")
}
for _, exten := range crl.TBSCertList.Extensions {
if exten.Id.Equal(oidExtensionAuthorityKeyId) {
a, err = unmarshalAuthKeyId(exten.Value)
if err != nil {
return a, err
}
}
}
return a, nil
}
func (p *CRLPool) AddCRL(crl *pkix.CertificateList) error {
if crl == nil {
return errors.New("add nil CertificateList to CRLPool")
}
a, err := getAuthorityKeyId(crl)
if err != nil {
return err
}
if len(a.Id) == 0 {
return fmt.Errorf("AuthorityKeyId not set in crl")
}
for _, revokedCert := range crl.TBSCertList.RevokedCertificates {
p.byIssuerAndSerial[genCRLPoolKey(a.Id, revokedCert.SerialNumber)] = revokedCert
}
return nil
}
func genCRLPoolKey(authorityKeyId []byte, serialNum *big.Int) string {
var buf bytes.Buffer
buf.WriteString(hex.EncodeToString(authorityKeyId))
buf.WriteString("_")
buf.WriteString(serialNum.Text(16))
return buf.String()
}
func (p *CRLPool) CheckCertRevoked(cert *x509.Certificate) bool {
if _, ok := p.byIssuerAndSerial[genCRLPoolKey(cert.AuthorityKeyId, cert.SerialNumber)]; ok {
return true
}
return false
}