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// Copyright (C) 2018 LEAP
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package standalone
import (
"fmt"
"io/ioutil"
"log"
"os"
"path"
"strconv"
"strings"
"0xacab.org/leap/shapeshifter"
)
const (
openvpnManagementAddr = "127.0.0.1"
openvpnManagementPort = "6061"
)
// StartVPN for provider
func (b *Bitmask) StartVPN(provider string) error {
var proxy string
if b.transport != "" {
var err error
proxy, err = b.startTransport()
if err != nil {
return err
}
}
return b.startOpenVPN(proxy)
}
func (b *Bitmask) startTransport() (proxy string, err error) {
proxy = "127.0.0.1:4430"
if b.shapes != nil {
return proxy, nil
}
gateways, err := b.bonafide.GetGateways(b.transport)
if err != nil {
return "", err
}
if len(gateways) == 0 {
log.Printf("No gateway for transport %s in provider", b.transport)
return "", nil
}
for _, gw := range gateways {
if _, ok := gw.Options["cert"]; !ok {
continue
}
b.shapes = &shapeshifter.ShapeShifter{
Cert: gw.Options["cert"],
Target: gw.IPAddress + ":" + gw.Ports[0],
SocksAddr: proxy,
}
if iatMode, ok := gw.Options["iat-mode"]; ok {
b.shapes.IatMode, err = strconv.Atoi(iatMode)
if err != nil {
b.shapes.IatMode = 0
}
}
err = b.shapes.Open()
if err != nil {
log.Printf("Can't connect to transport %s: %v", b.transport, err)
continue
}
return proxy, nil
}
return "", fmt.Errorf("No working gateway for transport %s: %v", b.transport, err)
}
func (b *Bitmask) startOpenVPN(proxy string) error {
certPemPath, err := b.getCert()
if err != nil {
return err
}
arg, err := b.bonafide.GetOpenvpnArgs()
if err != nil {
return err
}
if proxy == "" {
gateways, err := b.bonafide.GetGateways("openvpn")
if err != nil {
return err
}
err = b.launch.firewallStart(gateways)
if err != nil {
return err
}
for _, gw := range gateways {
for _, port := range gw.Ports {
arg = append(arg, "--remote", gw.IPAddress, port, "tcp4")
}
}
} else {
gateways, err := b.bonafide.GetGateways(b.transport)
if err != nil {
return err
}
err = b.launch.firewallStart(gateways)
if err != nil {
return err
}
proxyArgs := strings.Split(proxy, ":")
arg = append(arg, "--remote", proxyArgs[0], proxyArgs[1], "tcp4")
}
arg = append(arg,
"--verb", "1",
"--management-client",
"--management", openvpnManagementAddr, openvpnManagementPort,
"--ca", b.getCaCertPath(),
"--cert", certPemPath,
"--key", certPemPath)
return b.launch.openvpnStart(arg...)
}
func (b *Bitmask) getCert() (certPath string, err error) {
certPath = b.getCertPemPath()
if _, err := os.Stat(certPath); os.IsNotExist(err) {
cert, err := b.bonafide.GetCertPem()
if err != nil {
return "", err
}
err = ioutil.WriteFile(certPath, cert, 0600)
}
return certPath, err
}
// StopVPN or cancel
func (b *Bitmask) StopVPN() error {
err := b.launch.firewallStop()
if err != nil {
return err
}
if b.shapes != nil {
b.shapes.Close()
b.shapes = nil
}
return b.launch.openvpnStop()
}
// ReloadFirewall restarts the firewall
func (b *Bitmask) ReloadFirewall() error {
err := b.launch.firewallStop()
if err != nil {
return err
}
status, err := b.GetStatus()
if err != nil {
return err
}
if status != Off {
gateways, err := b.bonafide.GetGateways("openvpn")
if err != nil {
return err
}
return b.launch.firewallStart(gateways)
}
return nil
}
// GetStatus returns the VPN status
func (b *Bitmask) GetStatus() (string, error) {
status, err := b.getOpenvpnState()
if err != nil {
status = Off
}
if status == Off && b.launch.firewallIsUp() {
return Failed, nil
}
return status, nil
}
// InstallHelpers into the system
func (b *Bitmask) InstallHelpers() error {
// TODO
return nil
}
// VPNCheck returns if the helpers are installed and up to date and if polkit is running
func (b *Bitmask) VPNCheck() (helpers bool, priviledge bool, err error) {
return b.launch.check()
}
// ListGateways return the names of the gateways
func (b *Bitmask) ListGateways(provider string) ([]string, error) {
gateways, err := b.bonafide.GetGateways("openvpn")
if err != nil {
return nil, err
}
gatewayNames := make([]string, len(gateways))
for i, gw := range gateways {
gatewayNames[i] = gw.Location
}
return gatewayNames, nil
}
// UseGateway selects name as the default gateway
func (b *Bitmask) UseGateway(name string) error {
b.bonafide.SetDefaultGateway(name)
return nil
}
// UseTransport selects an obfuscation transport to use
func (b *Bitmask) UseTransport(transport string) error {
if transport != "obfs4" {
return fmt.Errorf("Transport %s not implemented", transport)
}
b.transport = transport
return nil
}
func (b *Bitmask) getCertPemPath() string {
return path.Join(b.tempdir, "openvpn.pem")
}
func (b *Bitmask) getCaCertPath() string {
return path.Join(b.tempdir, "cacert.pem")
}
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