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cryptutil: generate certificates from deriveca (#3992)

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Caleb Doxsey 2023-02-23 08:38:56 -07:00 • committed by GitHub
parent 00c047b114
commit d2b732243a
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8 changed files with 28 additions and 62 deletions
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64
pkg/cryptutil/certificates.go
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@ -2,8 +2,6 @@ package cryptutil
import (
"crypto/ecdsa"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
@ -12,10 +10,9 @@ import (
"errors"
"fmt"
"io"
"math/big"
"net"
"os"
"time"
"github.com/pomerium/pomerium/pkg/derivecert"
)
const (
@ -160,63 +157,24 @@ func EncodePrivateKey(key *ecdsa.PrivateKey) ([]byte, error) {
return pem.EncodeToMemory(keyBlock), nil
}
// GenerateSelfSignedCertificate generates a self-signed TLS certificate.
//
// mostly copied from https://golang.org/src/crypto/tls/generate_cert.go
func GenerateSelfSignedCertificate(domain string, configure ...func(*x509.Certificate)) (*tls.Certificate, error) {
privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
// GenerateCertificate generates a TLS certificate derived from a shared key.
func GenerateCertificate(sharedKey []byte, domain string, configure ...func(*x509.Certificate)) (*tls.Certificate, error) {
ca, err := derivecert.NewCA(sharedKey)
if err != nil {
return nil, fmt.Errorf("failed to generate private key: %w", err)
return nil, fmt.Errorf("cryptutil: failed to generate certificate, error deriving CA: %w", err)
}
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
pem, err := ca.NewServerCert([]string{domain}, configure...)
if err != nil {
return nil, fmt.Errorf("failed to generate serial number: %w", err)
return nil, fmt.Errorf("cryptutil: failed to generate certificate, error creating server certificate: %w", err)
}
template := &x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
Organization: []string{"Pomerium"},
},
NotBefore: time.Now().Add(-time.Minute * 10),
NotAfter: time.Now().Add(time.Hour * 24 * 365),
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
if ip := net.ParseIP(domain); ip != nil {
template.IPAddresses = append(template.IPAddresses, ip)
} else {
template.DNSNames = append(template.DNSNames, domain)
}
for _, f := range configure {
f(template)
}
publicKeyBytes, err := x509.CreateCertificate(rand.Reader,
template, template,
privateKey.Public(), privateKey,
)
tlsCert, err := pem.TLS()
if err != nil {
return nil, fmt.Errorf("failed to create certificate: %w", err)
return nil, fmt.Errorf("cryptutil: failed to generate certificate, error converting server certificate to TLS certificate: %w", err)
}
privateKeyBytes, err := x509.MarshalPKCS8PrivateKey(privateKey)
if err != nil {
return nil, fmt.Errorf("failed to marshal private key: %w", err)
}
cert, err := tls.X509KeyPair(
pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: publicKeyBytes}),
pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: privateKeyBytes}),
)
if err != nil {
return nil, fmt.Errorf("failed to convert x509 bytes into tls certificate: %w", err)
}
return &cert, nil
return &tlsCert, nil
}
// EncodeCertificate encodes a TLS certificate into PEM compatible byte slices.