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// Copyright 2017 Vector Creations Ltd
//
// 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/rand"
"crypto/rsa"
"crypto/x509"
"encoding/base64"
"encoding/pem"
"errors"
"fmt"
"math/big"
"os"
"strings"
"time"
)
const (
// ServerKeyFile is the name of the file holding the matrix server private key.
ServerKeyFile = "server_key.pem"
// TLSCertFile is the name of the file holding the TLS certificate used for federation.
TLSCertFile = "tls_cert.pem"
// TLSKeyFile is the name of the file holding the TLS key used for federation.
TLSKeyFile = "tls_key.pem"
)
// NewMatrixKey generates a new ed25519 matrix server key and writes it to a file.
func NewMatrixKey(matrixKeyPath string) (err error) {
var data [35]byte
_, err = rand.Read(data[:])
if err != nil {
return err
}
keyOut, err := os.OpenFile(matrixKeyPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return err
}
defer (func() {
err = keyOut.Close()
})()
keyID := base64.RawURLEncoding.EncodeToString(data[:])
keyID = strings.ReplaceAll(keyID, "-", "")
keyID = strings.ReplaceAll(keyID, "_", "")
err = pem.Encode(keyOut, &pem.Block{
Type: "MATRIX PRIVATE KEY",
Headers: map[string]string{
"Key-ID": fmt.Sprintf("ed25519:%s", keyID[:6]),
},
Bytes: data[3:],
})
return err
}
const certificateDuration = time.Hour * 24 * 365 * 10
func generateTLSTemplate(dnsNames []string) (*rsa.PrivateKey, *x509.Certificate, error) {
priv, err := rsa.GenerateKey(rand.Reader, 4096)
if err != nil {
return nil, nil, err
}
notBefore := time.Now()
notAfter := notBefore.Add(certificateDuration)
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return nil, nil, err
}
template := x509.Certificate{
SerialNumber: serialNumber,
NotBefore: notBefore,
NotAfter: notAfter,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
DNSNames: dnsNames,
}
return priv, &template, nil
}
func writeCertificate(tlsCertPath string, derBytes []byte) error {
certOut, err := os.Create(tlsCertPath)
if err != nil {
return err
}
defer certOut.Close() // nolint: errcheck
return pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
}
func writePrivateKey(tlsKeyPath string, priv *rsa.PrivateKey) error {
keyOut, err := os.OpenFile(tlsKeyPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return err
}
defer keyOut.Close() // nolint: errcheck
err = pem.Encode(keyOut, &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(priv),
})
return err
}
// NewTLSKey generates a new RSA TLS key and certificate and writes it to a file.
func NewTLSKey(tlsKeyPath, tlsCertPath string) error {
priv, template, err := generateTLSTemplate(nil)
if err != nil {
return err
}
// Self-signed certificate: template == parent
derBytes, err := x509.CreateCertificate(rand.Reader, template, template, &priv.PublicKey, priv)
if err != nil {
return err
}
if err = writeCertificate(tlsCertPath, derBytes); err != nil {
return err
}
return writePrivateKey(tlsKeyPath, priv)
}
func NewTLSKeyWithAuthority(serverName, tlsKeyPath, tlsCertPath, authorityKeyPath, authorityCertPath string) error {
priv, template, err := generateTLSTemplate([]string{serverName})
if err != nil {
return err
}
// load the authority key
dat, err := os.ReadFile(authorityKeyPath)
if err != nil {
return err
}
block, _ := pem.Decode([]byte(dat))
if block == nil || block.Type != "RSA PRIVATE KEY" {
return errors.New("authority .key is not a valid pem encoded rsa private key")
}
authorityPriv, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
return err
}
// load the authority certificate
dat, err = os.ReadFile(authorityCertPath)
if err != nil {
return err
}
block, _ = pem.Decode([]byte(dat))
if block == nil || block.Type != "CERTIFICATE" {
return errors.New("authority .crt is not a valid pem encoded x509 cert")
}
var caCerts []*x509.Certificate
caCerts, err = x509.ParseCertificates(block.Bytes)
if err != nil {
return err
}
if len(caCerts) != 1 {
return errors.New("authority .crt contains none or more than one cert")
}
authorityCert := caCerts[0]
// Sign the new certificate using the authority's key/cert
derBytes, err := x509.CreateCertificate(rand.Reader, template, authorityCert, &priv.PublicKey, authorityPriv)
if err != nil {
return err
}
if err = writeCertificate(tlsCertPath, derBytes); err != nil {
return err
}
return writePrivateKey(tlsKeyPath, priv)
}
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