/
tls_peer.go
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/
tls_peer.go
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// Copyright © 2018 Banzai Cloud
//
// 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 tls
import (
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"net"
"time"
"emperror.dev/errors"
)
// PeerCertificateRequest contains a set of options configurable for peer certificate generation.
type PeerCertificateRequest struct {
Subject pkix.Name
Validity time.Duration
DNSNames []string
IPAddresses []net.IP
notBefore time.Time
}
// PeerCertificate contains the generated certificate and key in PEM encoded format.
type PeerCertificate struct {
Certificate []byte
Key []byte
}
// GeneratePeerCertificate generates peer TLS certificate and key signed by a parent CA.
func GeneratePeerCertificate(req PeerCertificateRequest, signerCert *x509.Certificate, signerKey crypto.Signer) (*PeerCertificate, error) {
key, err := rsa.GenerateKey(rand.Reader, defaultKeyBits)
if err != nil {
return nil, errors.Wrap(err, "failed to generate rsa key")
}
keyBytes, err := keyToBytes(key)
if err != nil {
return nil, err
}
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return nil, errors.Wrap(err, "failed to generate serial number")
}
validity := req.Validity
if validity < 1 {
validity = defaultValidity
}
notBefore := req.notBefore
if notBefore.IsZero() {
notBefore = time.Now()
}
notAfter := notBefore.Add(validity)
certTemplate := &x509.Certificate{
SerialNumber: serialNumber,
Subject: req.Subject,
IPAddresses: req.IPAddresses,
DNSNames: req.DNSNames,
NotBefore: notBefore,
NotAfter: notAfter,
KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
BasicConstraintsValid: true,
}
cert, err := x509.CreateCertificate(rand.Reader, certTemplate, signerCert, key.Public(), signerKey)
if err != nil {
return nil, errors.Wrap(err, "failed to create x509 certificate")
}
certBytes, err := certToBytes(cert)
if err != nil {
return nil, err
}
return &PeerCertificate{
Certificate: certBytes,
Key: keyBytes,
}, nil
}