func main() {
// Generate client key.
clientKey, err := libtrust.GenerateECP256PrivateKey()
if err != nil {
log.Fatal(err)
}
// Add a comment for the client key.
clientKey.AddExtendedField("comment", "TLS Demo Client")
// Save the client key, public and private versions.
err = libtrust.SaveKey("client_data/private_key.pem", clientKey)
if err != nil {
log.Fatal(err)
}
err = libtrust.SavePublicKey("client_data/public_key.pem", clientKey.PublicKey())
if err != nil {
log.Fatal(err)
}
// Generate server key.
serverKey, err := libtrust.GenerateECP256PrivateKey()
if err != nil {
log.Fatal(err)
}
// Set the list of addresses to use for the server.
serverKey.AddExtendedField("hosts", []string{"localhost", "docker.example.com"})
// Save the server key, public and private versions.
err = libtrust.SaveKey("server_data/private_key.pem", serverKey)
if err != nil {
log.Fatal(err)
}
err = libtrust.SavePublicKey("server_data/public_key.pem", serverKey.PublicKey())
if err != nil {
log.Fatal(err)
}
// Generate Authorized Keys file for server.
err = libtrust.AddKeySetFile("server_data/trusted_clients.pem", clientKey.PublicKey())
if err != nil {
log.Fatal(err)
}
// Generate Known Host Keys file for client.
err = libtrust.AddKeySetFile("client_data/trusted_hosts.pem", serverKey.PublicKey())
if err != nil {
log.Fatal(err)
}
}
// LoadOrCreateTrustKey attempts to load the libtrust key at the given path,
// otherwise generates a new one
func LoadOrCreateTrustKey(trustKeyPath string) (libtrust.PrivateKey, error) {
err := os.MkdirAll(path.Dir(trustKeyPath), 0700)
if err != nil {
return nil, err
}
trustKey, err := libtrust.LoadKeyFile(trustKeyPath)
if err == libtrust.ErrKeyFileDoesNotExist {
trustKey, err = libtrust.GenerateECP256PrivateKey()
if err != nil {
return nil, fmt.Errorf("Error generating key: %s", err)
}
if err := libtrust.SaveKey(trustKeyPath, trustKey); err != nil {
return nil, fmt.Errorf("Error saving key file: %s", err)
}
} else if err != nil {
return nil, fmt.Errorf("Error loading key file: %s", err)
}
return trustKey, nil
}