[refactor] rename standalone to just vpn

1 files changed, 255 insertions, 0 deletions

diff --git a/pkg/vpn/openvpn.go b/pkg/vpn/openvpn.go
new file mode 100644
index 0000000..a75b830
--- /dev/null
+++ b/pkg/vpn/openvpn.go
@@ -0,0 +1,255 @@
+// 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 (
+	"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,
+		}
+		go b.listenShapeErr()
+		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) listenShapeErr() {
+	ch := b.shapes.GetErrorChannel()
+	for {
+		err, more := <-ch
+		if !more {
+			return
+		}
+		log.Printf("Error from shappeshifter: %v", 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")
+}