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wg_configurer_kernel.go
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wg_configurer_kernel.go
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//go:build linux && !android
package iface
import (
"fmt"
"net"
"time"
log "github.com/sirupsen/logrus"
"golang.zx2c4.com/wireguard/wgctrl"
"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
)
type wgKernelConfigurer struct {
deviceName string
}
func newWGConfigurer(deviceName string) wgConfigurer {
wgc := &wgKernelConfigurer{
deviceName: deviceName,
}
return wgc
}
func (c *wgKernelConfigurer) configureInterface(privateKey string, port int) error {
log.Debugf("adding Wireguard private key")
key, err := wgtypes.ParseKey(privateKey)
if err != nil {
return err
}
fwmark := getFwmark()
config := wgtypes.Config{
PrivateKey: &key,
ReplacePeers: true,
FirewallMark: &fwmark,
ListenPort: &port,
}
err = c.configure(config)
if err != nil {
return fmt.Errorf(`received error "%w" while configuring interface %s with port %d`, err, c.deviceName, port)
}
return nil
}
func (c *wgKernelConfigurer) updatePeer(peerKey string, allowedIps string, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error {
// parse allowed ips
_, ipNet, err := net.ParseCIDR(allowedIps)
if err != nil {
return err
}
peerKeyParsed, err := wgtypes.ParseKey(peerKey)
if err != nil {
return err
}
peer := wgtypes.PeerConfig{
PublicKey: peerKeyParsed,
ReplaceAllowedIPs: true,
AllowedIPs: []net.IPNet{*ipNet},
PersistentKeepaliveInterval: &keepAlive,
Endpoint: endpoint,
PresharedKey: preSharedKey,
}
config := wgtypes.Config{
Peers: []wgtypes.PeerConfig{peer},
}
err = c.configure(config)
if err != nil {
return fmt.Errorf(`received error "%w" while updating peer on interface %s with settings: allowed ips %s, endpoint %s`, err, c.deviceName, allowedIps, endpoint.String())
}
return nil
}
func (c *wgKernelConfigurer) removePeer(peerKey string) error {
peerKeyParsed, err := wgtypes.ParseKey(peerKey)
if err != nil {
return err
}
peer := wgtypes.PeerConfig{
PublicKey: peerKeyParsed,
Remove: true,
}
config := wgtypes.Config{
Peers: []wgtypes.PeerConfig{peer},
}
err = c.configure(config)
if err != nil {
return fmt.Errorf(`received error "%w" while removing peer %s from interface %s`, err, peerKey, c.deviceName)
}
return nil
}
func (c *wgKernelConfigurer) addAllowedIP(peerKey string, allowedIP string) error {
_, ipNet, err := net.ParseCIDR(allowedIP)
if err != nil {
return err
}
peerKeyParsed, err := wgtypes.ParseKey(peerKey)
if err != nil {
return err
}
peer := wgtypes.PeerConfig{
PublicKey: peerKeyParsed,
UpdateOnly: true,
ReplaceAllowedIPs: false,
AllowedIPs: []net.IPNet{*ipNet},
}
config := wgtypes.Config{
Peers: []wgtypes.PeerConfig{peer},
}
err = c.configure(config)
if err != nil {
return fmt.Errorf(`received error "%w" while adding allowed Ip to peer on interface %s with settings: allowed ips %s`, err, c.deviceName, allowedIP)
}
return nil
}
func (c *wgKernelConfigurer) removeAllowedIP(peerKey string, allowedIP string) error {
_, ipNet, err := net.ParseCIDR(allowedIP)
if err != nil {
return err
}
peerKeyParsed, err := wgtypes.ParseKey(peerKey)
if err != nil {
return err
}
existingPeer, err := c.getPeer(c.deviceName, peerKey)
if err != nil {
return err
}
newAllowedIPs := existingPeer.AllowedIPs
for i, existingAllowedIP := range existingPeer.AllowedIPs {
if existingAllowedIP.String() == ipNet.String() {
newAllowedIPs = append(existingPeer.AllowedIPs[:i], existingPeer.AllowedIPs[i+1:]...) //nolint:gocritic
break
}
}
peer := wgtypes.PeerConfig{
PublicKey: peerKeyParsed,
UpdateOnly: true,
ReplaceAllowedIPs: true,
AllowedIPs: newAllowedIPs,
}
config := wgtypes.Config{
Peers: []wgtypes.PeerConfig{peer},
}
err = c.configure(config)
if err != nil {
return fmt.Errorf(`received error "%w" while removing allowed IP from peer on interface %s with settings: allowed ips %s`, err, c.deviceName, allowedIP)
}
return nil
}
func (c *wgKernelConfigurer) getPeer(ifaceName, peerPubKey string) (wgtypes.Peer, error) {
wg, err := wgctrl.New()
if err != nil {
return wgtypes.Peer{}, err
}
defer func() {
err = wg.Close()
if err != nil {
log.Errorf("got error while closing wgctl: %v", err)
}
}()
wgDevice, err := wg.Device(ifaceName)
if err != nil {
return wgtypes.Peer{}, err
}
for _, peer := range wgDevice.Peers {
if peer.PublicKey.String() == peerPubKey {
return peer, nil
}
}
return wgtypes.Peer{}, fmt.Errorf("peer not found")
}
func (c *wgKernelConfigurer) configure(config wgtypes.Config) error {
wg, err := wgctrl.New()
if err != nil {
return err
}
defer wg.Close()
// validate if device with name exists
_, err = wg.Device(c.deviceName)
if err != nil {
return err
}
log.Tracef("got Wireguard device %s", c.deviceName)
return wg.ConfigureDevice(c.deviceName, config)
}
func (c *wgKernelConfigurer) close() {
}
func (c *wgKernelConfigurer) getStats(peerKey string) (WGStats, error) {
peer, err := c.getPeer(c.deviceName, peerKey)
if err != nil {
return WGStats{}, fmt.Errorf("get wireguard stats: %w", err)
}
return WGStats{
LastHandshake: peer.LastHandshakeTime,
TxBytes: peer.TransmitBytes,
RxBytes: peer.ReceiveBytes,
}, nil
}