OPENVPN_AUTH variable, refers to #94

internal/settings/openvpn.go

@@ -16,6 +16,7 @@ type OpenVPN struct {
 	Root            bool
 	TargetIP        net.IP
 	Cipher          string
+	Auth            string
 }
 
 // GetOpenVPNSettings obtains the OpenVPN settings using the params functions
@@ -40,6 +41,10 @@ func GetOpenVPNSettings(params params.ParamsReader) (settings OpenVPN, err error
 	if err != nil {
 		return settings, err
 	}
+	settings.Auth, err = params.GetOpenVPNAuth()
+	if err != nil {
+		return settings, err
+	}
 	return settings, nil
 }
 
@@ -55,6 +60,7 @@ func (o *OpenVPN) String() string {
 		"Run as root: " + runAsRoot,
 		"Target IP address: " + o.TargetIP.String(),
 		"Custom cipher: " + o.Cipher,
+		"Custom auth algorithm: " + o.Auth,
 	}
 	return strings.Join(settingsList, "\n|--")
 }

internal/settings/settings.go

@@ -57,6 +57,11 @@ func GetAllSettings(params params.ParamsReader) (settings Settings, err error) {
 		default:
 			return settings, fmt.Errorf("cipher %q is not supported by Private Internet Access", settings.OpenVPN.Cipher)
 		}
+		switch settings.OpenVPN.Auth {
+		case "", "sha1", "sha256":
+		default:
+			return settings, fmt.Errorf("auth algorithm %q is not supported by Private Internet Access", settings.OpenVPN.Auth)
+		}
 		settings.PIA, err = GetPIASettings(params)
 	case "mullvad":
 		switch settings.OpenVPN.Cipher {
@@ -64,6 +69,11 @@ func GetAllSettings(params params.ParamsReader) (settings Settings, err error) {
 		default:
 			return settings, fmt.Errorf("cipher %q is not supported by Mullvad", settings.OpenVPN.Cipher)
 		}
+		switch settings.OpenVPN.Auth {
+		case "":
+		default:
+			return settings, fmt.Errorf("auth algorithm %q is not supported by Mullvad (not using auth at all)", settings.OpenVPN.Auth)
+		}
 		settings.Mullvad, err = GetMullvadSettings(params)
 	default:
 		return settings, fmt.Errorf("VPN service provider %q is not valid", settings.VPNSP)