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cert_auth.go
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cert_auth.go
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/*-
* Copyright 2015 Square Inc.
* Copyright 2014 CoreOS
*
* 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 pkix
import (
"crypto/rand"
"crypto/x509"
"crypto/x509/pkix"
"math/big"
"time"
)
const (
// hostname used by CA certificate
// SerialNumber to start when signing certificate request
authStartSerialNumber = 2
)
var (
authPkixName = pkix.Name{
Country: nil,
Organization: nil,
OrganizationalUnit: nil,
Locality: nil,
Province: nil,
StreetAddress: nil,
PostalCode: nil,
SerialNumber: "",
CommonName: "",
}
// Build CA based on RFC5280
authTemplate = x509.Certificate{
SerialNumber: big.NewInt(1),
Subject: authPkixName,
// NotBefore is set to be 10min earlier to fix gap on time difference in cluster
NotBefore: time.Now().Add(-600).UTC(),
NotAfter: time.Time{},
// Used for certificate signing only
KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageCRLSign,
ExtKeyUsage: nil,
UnknownExtKeyUsage: nil,
// activate CA
BasicConstraintsValid: true,
IsCA: true,
// Not allow any non-self-issued intermediate CA, sets MaxPathLen=0
MaxPathLenZero: true,
// 160-bit SHA-1 hash of the value of the BIT STRING subjectPublicKey
// (excluding the tag, length, and number of unused bits)
// **SHOULD** be filled in later
SubjectKeyId: nil,
// Subject Alternative Name
DNSNames: nil,
PermittedDNSDomainsCritical: false,
PermittedDNSDomains: nil,
}
)
// CreateCertificateAuthority creates Certificate Authority using existing key.
// CertificateAuthorityInfo returned is the extra infomation required by Certificate Authority.
func CreateCertificateAuthority(key *Key, organizationalUnit string, years int, organization string, country string, province string, locality string, commonName string) (*Certificate, error) {
subjectKeyID, err := GenerateSubjectKeyID(key.Public)
if err != nil {
return nil, err
}
authTemplate.SubjectKeyId = subjectKeyID
authTemplate.NotAfter = time.Now().AddDate(years, 0, 0).UTC()
if len(country) > 0 {
authTemplate.Subject.Country = []string{country}
}
if len(province) > 0 {
authTemplate.Subject.Province = []string{province}
}
if len(locality) > 0 {
authTemplate.Subject.Locality = []string{locality}
}
if len(organization) > 0 {
authTemplate.Subject.Organization = []string{organization}
}
if len(organizationalUnit) > 0 {
authTemplate.Subject.OrganizationalUnit = []string{organizationalUnit}
}
if len(commonName) > 0 {
authTemplate.Subject.CommonName = commonName
}
crtBytes, err := x509.CreateCertificate(rand.Reader, &authTemplate, &authTemplate, key.Public, key.Private)
if err != nil {
return nil, err
}
return NewCertificateFromDER(crtBytes), nil
}
// CreateIntermediateCertificateAuthority creates an intermediate
// CA certificate signed by the given authority.
func CreateIntermediateCertificateAuthority(crtAuth *Certificate, keyAuth *Key, csr *CertificateSigningRequest, years int) (*Certificate, error) {
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return nil, err
}
authTemplate.SerialNumber.Set(serialNumber)
authTemplate.MaxPathLenZero = false
rawCsr, err := csr.GetRawCertificateSigningRequest()
if err != nil {
return nil, err
}
authTemplate.RawSubject = rawCsr.RawSubject
caExpiry := time.Now().Add(crtAuth.GetExpirationDuration())
proposedExpiry := time.Now().AddDate(years, 0, 0).UTC()
// ensure cert doesn't expire after issuer
if caExpiry.Before(proposedExpiry) {
authTemplate.NotAfter = caExpiry
} else {
authTemplate.NotAfter = proposedExpiry
}
authTemplate.SubjectKeyId, err = GenerateSubjectKeyID(rawCsr.PublicKey)
if err != nil {
return nil, err
}
authTemplate.IPAddresses = rawCsr.IPAddresses
authTemplate.DNSNames = rawCsr.DNSNames
rawCrtAuth, err := crtAuth.GetRawCertificate()
if err != nil {
return nil, err
}
crtOutBytes, err := x509.CreateCertificate(rand.Reader, &authTemplate, rawCrtAuth, rawCsr.PublicKey, keyAuth.Private)
if err != nil {
return nil, err
}
return NewCertificateFromDER(crtOutBytes), nil
}