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// +build linux
// Copyright (C) 2018-2020 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 vpn
import (
"errors"
"log"
"os"
"os/exec"
"strings"
"0xacab.org/leap/bitmask-vpn/pkg/config"
"0xacab.org/leap/bitmask-vpn/pkg/vpn/bonafide"
"github.com/keybase/go-ps"
)
const (
systemOpenvpnPath = "/usr/sbin/openvpn"
)
var bitmaskRootPaths = []string{
"/usr/sbin/bitmask-root",
"/usr/local/sbin/bitmask-root",
}
type launcher struct {
openvpnCh chan []string
}
func newLauncher() (*launcher, error) {
l := launcher{make(chan []string, 1)}
go l.openvpnRunner()
return &l, nil
}
func (l *launcher) close() error {
return nil
}
func (l *launcher) check() (helpers bool, privilege bool, err error) {
hasHelpers, err := hasHelpers()
if err != nil {
log.Println("Error checking helpers")
return
}
if !hasHelpers {
log.Println("Could not find helpers")
return false, true, nil
}
isRunning, err := isPolkitRunning()
if err != nil {
log.Println("Error checking if polkit is running")
return
}
if !isRunning {
polkitPath := getPolkitPath()
if polkitPath == "" {
log.Println("Cannot find any usable polkit")
return true, false, nil
}
cmd := exec.Command("setsid", polkitPath)
err = cmd.Start()
if err != nil {
log.Println("Cannot launch polkit")
return
}
log.Println("Checking if polkit is running after attempted launch")
isRunning, err = isPolkitRunning()
return true, isRunning, err
}
return true, true, nil
}
func hasHelpers() (bool, error) {
/* TODO add polkit file too */
if _, err := bitmaskRootPath(); err == nil {
return true, nil
}
return false, nil
}
func isPolkitRunning() (bool, error) {
// TODO shouldn't we also check for polkitd running?
var polkitProcNames = [...]string{
"polkit-gnome-authentication-agent-1",
"polkit-kde-auth",
"polkit-mate-authentication-agent-1",
"lxpolkit",
"lxqt-policykit-agent",
"lxsession",
"gnome-shell",
"gnome-flashback",
"fingerprint-polkit-agent",
"xfce-polkit",
}
processes, err := ps.Processes()
if err != nil {
return false, err
}
for _, proc := range processes {
executable := proc.Executable()
for _, name := range polkitProcNames {
if strings.Contains(executable, name) {
return true, nil
}
}
}
return false, nil
}
func getPolkitPath() string {
var polkitPaths = [...]string{
"/usr/bin/lxpolkit",
"/usr/bin/lxqt-policykit-agent",
"/usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1",
"/usr/lib/x86_64-linux-gnu/polkit-mate/polkit-mate-authentication-agent-1",
"/usr/lib/mate-polkit/polkit-mate-authentication-agent-1",
"/usr/lib/x86_64-linux-gnu/libexec/polkit-kde-authentication-agent-1",
"/usr/lib/kde4/libexec/polkit-kde-authentication-agent-1",
// now we get weird
"/usr/libexec/policykit-1-pantheon/pantheon-agent-polkit",
"/usr/lib/polkit-1-dde/dde-polkit-agent",
// do you know some we"re still missing? :)
}
for _, polkit := range polkitPaths {
_, err := os.Stat(polkit)
if err == nil {
return polkit
}
}
return ""
}
func (l *launcher) openvpnStart(flags ...string) error {
log.Println("openvpn start: ", flags)
arg := []string{"openvpn", "start", getOpenvpnPath()}
arg = append(arg, flags...)
l.openvpnCh <- arg
return nil
}
func (l *launcher) openvpnStop() error {
l.openvpnCh <- nil
log.Println("openvpn stop")
return runBitmaskRoot("openvpn", "stop")
}
func (l *launcher) firewallStart(gateways []bonafide.Gateway) error {
log.Println("firewall start")
arg := []string{"firewall", "start"}
for _, gw := range gateways {
arg = append(arg, gw.IPAddress)
}
return runBitmaskRoot(arg...)
}
func (l *launcher) firewallStop() error {
log.Println("firewall stop")
return runBitmaskRoot("firewall", "stop")
}
func (l *launcher) firewallIsUp() bool {
err := runBitmaskRoot("firewall", "isup")
return err == nil
}
func (l *launcher) openvpnRunner(arg ...string) {
running := false
runOpenvpn := func(arg []string) {
for running {
err := runBitmaskRoot(arg...)
if err != nil {
log.Printf("An error ocurred running openvpn: %v", err)
}
}
}
for arg := range l.openvpnCh {
if arg == nil {
running = false
} else {
running = true
go runOpenvpn(arg)
}
}
}
func runBitmaskRoot(arg ...string) error {
bitmaskRoot, err := bitmaskRootPath()
if err != nil {
return err
}
arg = append([]string{bitmaskRoot}, arg...)
out, err := exec.Command("pkexec", arg...).Output()
if err != nil && arg[2] != "isup" {
log.Println("Error while running bitmask-root:")
log.Println("args: ", arg)
log.Println("output: ", string(out))
}
return err
}
func bitmaskRootPath() (string, error) {
if os.Getenv("SNAP") != "" {
path := "/snap/bin/" + config.BinaryName + ".bitmask-root"
if _, err := os.Stat(path); !os.IsNotExist(err) {
return path, nil
}
}
for _, path := range bitmaskRootPaths {
if _, err := os.Stat(path); !os.IsNotExist(err) {
return path, nil
}
}
log.Println("Can't find bitmask-root")
return "", errors.New("nohelpers")
}
func getOpenvpnPath() string {
if os.Getenv("SNAP") != "" {
return "/snap/bin/" + config.BinaryName + ".openvpn"
}
return systemOpenvpnPath
}
|
