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package pki
import (
"crypto/rand"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"math/big"
"net"
"time"
)
// labels used in the pem file format to mark certificate sign requests and certificates
const (
PemLabelCertificateRequest = "CERTIFICATE REQUEST"
PemLabelCertificate = "CERTIFICATE"
)
type (
// Use CertificateData to fill in the minimum data you need to create a certificate
// sign request.
CertificateData struct {
Subject pkix.Name
DNSNames []string
EmailAddresses []string
IPAddresses []net.IP
}
// Certificate is an alias on the x509.Certificate to add some methods.
Certificate x509.Certificate
// CertificateRequest is an alias on the x509.CertificateRequest to add some methods.
CertificateRequest x509.CertificateRequest
// CertificateOptions is used to provide the necessary information to create
// a certificate from a certificate sign request.
CertificateOptions struct {
SerialNumber *big.Int
NotBefore time.Time
NotAfter time.Time // Validity bounds.
IsCA bool
// how many sub ca are allowed between this ca and the end/final certificate
// if it is -1, then no limit will be set
CALength int
KeyUsage x509.KeyUsage // for what can the certificate be used
KeyExtendedUsage []x509.ExtKeyUsage // extended usage for the certificate
}
)
// Create a new set of certificate data.
func NewCertificateData() *CertificateData {
return &CertificateData{Subject: pkix.Name{}}
}
// Create a certificate sign request from the input data and the private key of
// the request creator.
func (c *CertificateData) ToCertificateRequest(private_key PrivateKey) (*CertificateRequest, error) {
csr := &x509.CertificateRequest{}
csr.Subject = c.Subject
csr.DNSNames = c.DNSNames
csr.IPAddresses = c.IPAddresses
csr.EmailAddresses = c.EmailAddresses
csr_asn1, err := x509.CreateCertificateRequest(rand.Reader, csr, private_key.PrivateKey())
if err != nil {
return nil, err
}
return LoadCertificateSignRequest(csr_asn1)
}
// Load a certificate sign request from its asn1 representation.
func LoadCertificateSignRequest(raw []byte) (*CertificateRequest, error) {
csr, err := x509.ParseCertificateRequest(raw)
if err != nil {
return nil, err
}
return (*CertificateRequest)(csr), nil
}
// Return the certificate sign request as a pem block.
func (c *CertificateRequest) MarshalPem() (marshalledPemBlock, error) {
block := &pem.Block{Type: PemLabelCertificateRequest, Bytes: c.Raw}
return pem.EncodeToMemory(block), nil
}
// Convert the certificate sign request to a certificate using the private key
// of the signer and the certificate of the signer.
// If the certificate is null, the sign request will be used to sign itself.
// Please also see the certificate options struct for information on mandatory fields.
// For more information, please read http://golang.org/pkg/crypto/x509/#CreateCertificate
func (c *CertificateRequest) ToCertificate(private_key PrivateKey,
cert_opts CertificateOptions, ca *Certificate) (*Certificate, error) {
if err := cert_opts.Valid(); err != nil {
return nil, err
}
template := &x509.Certificate{}
template.Subject = c.Subject
template.DNSNames = c.DNSNames
template.IPAddresses = c.IPAddresses
template.EmailAddresses = c.EmailAddresses
// if no ca is given, we have to set IsCA to self sign
if ca == nil {
template.IsCA = true
}
template.NotBefore = cert_opts.NotBefore
template.NotAfter = cert_opts.NotAfter
template.KeyUsage = cert_opts.KeyUsage
template.ExtKeyUsage = cert_opts.KeyExtendedUsage
template.IsCA = cert_opts.IsCA
if cert_opts.IsCA {
template.BasicConstraintsValid = true
}
if cert_opts.CALength >= 0 {
template.MaxPathLen = cert_opts.CALength
template.MaxPathLenZero = true
template.BasicConstraintsValid = true
}
template.SerialNumber = cert_opts.SerialNumber
var cert_asn1 []byte
var err error
// if we have no ca which can sign the cert, a self signed cert is wanted
// (or isn't it? Maybe we should split creation of the template? But that would be ugly)
if ca == nil {
cert_asn1, err = x509.CreateCertificate(rand.Reader, template, template, c.PublicKey, private_key.PrivateKey())
} else {
cert_asn1, err = x509.CreateCertificate(rand.Reader, template, (*x509.Certificate)(ca), c.PublicKey, private_key.PrivateKey())
}
if err != nil {
return nil, err
}
return LoadCertificate(cert_asn1)
}
// Load a certificate from its asn1 representation.
func LoadCertificate(raw []byte) (*Certificate, error) {
cert, err := x509.ParseCertificate(raw)
if err != nil {
return nil, err
}
return (*Certificate)(cert), nil
}
// marshal the certificate to a pem block
func (c *Certificate) MarshalPem() (marshalledPemBlock, error) {
block := &pem.Block{Type: PemLabelCertificate, Bytes: c.Raw}
return pem.EncodeToMemory(block), nil
}
// Check if the certificate options have the required fields set.
func (co *CertificateOptions) Valid() error {
if co.SerialNumber == nil {
return fmt.Errorf("No serial number set!")
}
return nil
}
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