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x509.go
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x509.go
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/**
* Copyright © 2024, Staufi Tech - Switzerland
* All rights reserved.
*
* ________________________ ___ _ ________________ _ ____
* / _____ _ ____________/ / __|_| /_______________ | | ___/
* ( (____ _| |_ _____ _ _ _| |__ _ | |_____ ____| |_|_
* \____ (_ _|____ | | | (_ __) | | | ___ |/ ___) _ \
* _____) )| |_/ ___ | |_| | | | | | | | ____( (___| | | |
* (______/ \__)_____|____/ |_| |_| |_|_____)\____)_| |_|
*
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package crypto
import (
"bytes"
crand "crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"math/big"
"net"
"time"
log "github.com/ChrIgiSta/go-utils/logger"
)
type KeyLength int
const (
KeyLength1024Bit KeyLength = 1024
KeyLength2048Bit KeyLength = 2048
KeyLength4096Bit KeyLength = 4096
KeyLength8192Bit KeyLength = 8192
)
const MinimalAllowedKeyLength = KeyLength2048Bit
type CertChecker struct {
rootCAs *x509.CertPool
}
func NewCustomCertChecker(rootCAs *x509.CertPool) *CertChecker {
return &CertChecker{
rootCAs: rootCAs,
}
}
// This Certificate checker ignores the SAN and CN
func (c *CertChecker) X509CeckCertNoSAN(rawCerts [][]byte,
verifiedChains [][]*x509.Certificate) (err error) {
var certificates []*x509.Certificate
// read certs
for _, serverCerts := range rawCerts {
crt, e := x509.ParseCertificate(serverCerts)
if e != nil {
err = x509.CertificateInvalidError{}
break
}
certificates = append(certificates, crt)
}
// validate
for _, cert := range certificates {
_ = log.Debug("x509",
"Certificate Check:> issuer: %v, isCa:%v, notBefore: %v, notAfter: %v",
cert.Issuer, cert.IsCA, cert.NotBefore, cert.NotAfter)
opts := x509.VerifyOptions{
Roots: c.rootCAs,
DNSName: "", // disables verifying hostname or IP
Intermediates: x509.NewCertPool(),
}
_, err = cert.Verify(opts)
}
return err
}
type CertificateSubject struct {
Organisation string
Country string
Province string
Locality string
OrgUnit string
CommonName string
}
func CreateSelfsignedX509Certificate(serialNumber *big.Int,
validityDays int,
rsaKeyLen KeyLength,
subject CertificateSubject) (certificate []byte, privateKey []byte, err error) {
signCert, privKey, err := CreateCert(serialNumber,
validityDays, rsaKeyLen, subject)
if err != nil {
return nil, nil, err
}
return EncodeCertificatePEMForm(signCert),
EncodeRsaKeyPEMForm(privKey), nil
}
func CreateCert(serialNumber *big.Int, validityDays int,
keyLength KeyLength, subject CertificateSubject) ([]byte, *rsa.PrivateKey, error) {
if keyLength < MinimalAllowedKeyLength {
return nil, nil,
fmt.Errorf("rsa key length lower than %v to insecure",
int(MinimalAllowedKeyLength))
}
privateKey, err := rsa.GenerateKey(crand.Reader, int(keyLength))
if err != nil {
return nil, nil, err
}
certificate := &x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
Organization: []string{subject.Organisation},
Country: []string{subject.Country},
Province: []string{subject.Province},
Locality: []string{subject.Locality},
OrganizationalUnit: []string{subject.OrgUnit},
CommonName: subject.CommonName,
},
IPAddresses: []net.IP{net.IPv4(127, 0, 0, 1), net.IPv6loopback},
NotBefore: time.Now(),
NotAfter: time.Now().Local().Add(time.Duration(validityDays) * time.Hour * 24),
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
KeyUsage: x509.KeyUsageDigitalSignature,
}
// self-sign certificate
signCert, err := x509.CreateCertificate(
crand.Reader, certificate, certificate, &privateKey.PublicKey, privateKey)
if err != nil {
return nil, nil, err
}
return signCert, privateKey, err
}
func EncodeCertificatePEMForm(certificate []byte) []byte {
return EncodePEMForm(certificate, "CERTIFICATE")
}
func EncodeRsaKeyPEMForm(privateKey *rsa.PrivateKey) []byte {
return EncodePEMForm(
x509.MarshalPKCS1PrivateKey(privateKey),
"RSA PRIVATE KEY")
}
func EncodePEMForm(content []byte, typ string) []byte {
pemForm := new(bytes.Buffer)
if pem.Encode(pemForm, &pem.Block{
Type: typ,
Bytes: content,
}) != nil {
return nil
}
return pemForm.Bytes()
}