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// Copyright 2022 The Sigstore 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 test
import (
"crypto"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"crypto/x509/pkix"
"encoding/asn1"
"math/big"
"time"
)
/*
To use:
rootCert, rootKey, _ := GenerateRootCA()
subCert, subKey, _ := GenerateSubordinateCa(rootCert, rootKey)
leafCert, _, _ := GenerateLeafCert("subject", "oidc-issuer", subCert, subKey)
roots := x509.NewCertPool()
subs := x509.NewCertPool()
roots.AddCert(rootCert)
subs.AddCert(subCert)
opts := x509.VerifyOptions{
Roots: roots,
Intermediates: subs,
KeyUsages: []x509.ExtKeyUsage{
x509.ExtKeyUsageCodeSigning,
},
}
_, err := leafCert.Verify(opts)
*/
func createCertificate(template *x509.Certificate, parent *x509.Certificate, pub interface{}, priv crypto.Signer) (*x509.Certificate, error) {
certBytes, err := x509.CreateCertificate(rand.Reader, template, parent, pub, priv)
if err != nil {
return nil, err
}
cert, err := x509.ParseCertificate(certBytes)
if err != nil {
return nil, err
}
return cert, nil
}
func GenerateRootCA() (*x509.Certificate, *ecdsa.PrivateKey, error) {
rootTemplate := &x509.Certificate{
SerialNumber: big.NewInt(1),
Subject: pkix.Name{
CommonName: "sigstore",
Organization: []string{"sigstore.dev"},
},
NotBefore: time.Now().Add(-5 * time.Minute),
NotAfter: time.Now().Add(5 * time.Hour),
KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageCRLSign,
BasicConstraintsValid: true,
IsCA: true,
}
priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
return nil, nil, err
}
cert, err := createCertificate(rootTemplate, rootTemplate, &priv.PublicKey, priv)
if err != nil {
return nil, nil, err
}
return cert, priv, nil
}
func GenerateRootCAFromSigner(signer crypto.Signer) (*x509.Certificate, error) {
rootTemplate := &x509.Certificate{
SerialNumber: big.NewInt(1),
Subject: pkix.Name{
CommonName: "sigstore",
Organization: []string{"sigstore.dev"},
},
NotBefore: time.Now().Add(-5 * time.Minute),
NotAfter: time.Now().Add(5 * time.Hour),
KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageCRLSign,
BasicConstraintsValid: true,
IsCA: true,
}
cert, err := createCertificate(rootTemplate, rootTemplate, signer.Public(), signer)
if err != nil {
return nil, err
}
return cert, nil
}
func GenerateSubordinateCA(rootTemplate *x509.Certificate, rootPriv crypto.Signer) (*x509.Certificate, *ecdsa.PrivateKey, error) {
subTemplate := &x509.Certificate{
SerialNumber: big.NewInt(1),
Subject: pkix.Name{
CommonName: "sigstore-sub",
Organization: []string{"sigstore.dev"},
},
NotBefore: time.Now().Add(-2 * time.Minute),
NotAfter: time.Now().Add(2 * time.Hour),
KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageCRLSign,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageCodeSigning},
BasicConstraintsValid: true,
IsCA: true,
}
priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
return nil, nil, err
}
cert, err := createCertificate(subTemplate, rootTemplate, &priv.PublicKey, rootPriv)
if err != nil {
return nil, nil, err
}
return cert, priv, nil
}
func GenerateWeakSubordinateCA(rootTemplate *x509.Certificate, rootPriv crypto.Signer) (*x509.Certificate, *ecdsa.PrivateKey, error) {
subTemplate := &x509.Certificate{
SerialNumber: big.NewInt(1),
Subject: pkix.Name{
CommonName: "sigstore-sub",
Organization: []string{"sigstore.dev"},
},
NotBefore: time.Now().Add(-2 * time.Minute),
NotAfter: time.Now().Add(2 * time.Hour),
KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageCRLSign,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageCodeSigning},
BasicConstraintsValid: true,
IsCA: true,
}
priv, err := ecdsa.GenerateKey(elliptic.P224(), rand.Reader)
if err != nil {
return nil, nil, err
}
cert, err := createCertificate(subTemplate, rootTemplate, &priv.PublicKey, rootPriv)
if err != nil {
return nil, nil, err
}
return cert, priv, nil
}
func GenerateSubordinateCAWithoutEKU(rootTemplate *x509.Certificate, rootPriv crypto.Signer) (*x509.Certificate, *ecdsa.PrivateKey, error) {
subTemplate := &x509.Certificate{
SerialNumber: big.NewInt(1),
Subject: pkix.Name{
CommonName: "sigstore-sub",
Organization: []string{"sigstore.dev"},
},
NotBefore: time.Now().Add(-2 * time.Minute),
NotAfter: time.Now().Add(2 * time.Hour),
KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageCRLSign,
BasicConstraintsValid: true,
IsCA: true,
}
priv, err := ecdsa.GenerateKey(elliptic.P224(), rand.Reader)
if err != nil {
return nil, nil, err
}
cert, err := createCertificate(subTemplate, rootTemplate, &priv.PublicKey, rootPriv)
if err != nil {
return nil, nil, err
}
return cert, priv, nil
}
func GenerateLeafCert(subject string, oidcIssuer string, parentTemplate *x509.Certificate, parentPriv crypto.Signer) (*x509.Certificate, *ecdsa.PrivateKey, error) {
certTemplate := &x509.Certificate{
SerialNumber: big.NewInt(1),
EmailAddresses: []string{subject},
NotBefore: time.Now().Add(-1 * time.Minute),
NotAfter: time.Now().Add(time.Hour),
KeyUsage: x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageCodeSigning},
IsCA: false,
ExtraExtensions: []pkix.Extension{{
// OID for OIDC Issuer extension
Id: asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 57264, 1, 1},
Critical: false,
Value: []byte(oidcIssuer),
}},
}
priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
return nil, nil, err
}
cert, err := createCertificate(certTemplate, parentTemplate, &priv.PublicKey, parentPriv)
if err != nil {
return nil, nil, err
}
return cert, priv, nil
}
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