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cert_auth.go
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cert_auth.go
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package pkix
import (
"crypto/rand"
"crypto/x509"
"crypto/x509/pkix"
"math/big"
"time"
)
const (
// hostname used by CA certificate
authHostname = "CA"
// SerialNumber to start when signing certificate request
authStartSerialNumber = 2
)
var (
authPkixName = pkix.Name{
Country: nil,
Organization: nil,
OrganizationalUnit: []string{authHostname},
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,
ExtKeyUsage: nil,
UnknownExtKeyUsage: nil,
// activate CA
BasicConstraintsValid: true,
IsCA: true,
// Not allow any non-self-issued intermediate CA
MaxPathLen: 0,
// 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, years int, organization string, country string) (*Certificate, *CertificateAuthorityInfo, error) {
subjectKeyId, err := GenerateSubjectKeyId(key.Public)
if err != nil {
return nil, nil, err
}
authTemplate.SubjectKeyId = subjectKeyId
authTemplate.NotAfter = time.Now().AddDate(years, 0, 0).UTC()
authTemplate.Subject.Country = []string{country}
authTemplate.Subject.Organization = []string{organization}
crtBytes, err := x509.CreateCertificate(rand.Reader, &authTemplate, &authTemplate, key.Public, key.Private)
if err != nil {
return nil, nil, err
}
return NewCertificateFromDER(crtBytes), NewCertificateAuthorityInfo(authStartSerialNumber), nil
}