/
wireguard.go
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/
wireguard.go
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package wireguard
import (
"context"
"fmt"
"log"
"net"
"strconv"
"strings"
"sync"
"time"
"github.com/USA-RedDragon/aredn-manager/internal/db/models"
"github.com/phayes/freeport"
"github.com/vishvananda/netlink"
"golang.org/x/sync/errgroup"
"golang.zx2c4.com/wireguard/wgctrl"
"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
"gorm.io/gorm"
)
const defTimeout = 10 * time.Second
type Manager struct {
db *gorm.DB
peerAddChan chan models.Tunnel
peerAddConfirmChan chan models.Tunnel
peerRemoveChan chan models.Tunnel
peerRemoveConfirmChan chan models.Tunnel
shutdownChan chan struct{}
shutdownConfirmChan chan struct{}
activePeers sync.Map
wgClient *wgctrl.Client
}
func NewManager(db *gorm.DB) (*Manager, error) {
wgClient, err := wgctrl.New()
if err != nil {
return nil, err
}
return &Manager{
db: db,
peerAddChan: make(chan models.Tunnel),
peerAddConfirmChan: make(chan models.Tunnel),
peerRemoveChan: make(chan models.Tunnel),
peerRemoveConfirmChan: make(chan models.Tunnel),
shutdownChan: make(chan struct{}),
shutdownConfirmChan: make(chan struct{}),
activePeers: sync.Map{},
wgClient: wgClient,
}, nil
}
func (m *Manager) Run() error {
go m.run()
return m.initializeTunnels()
}
func (m *Manager) removeAllPeers() error {
errGroup := &errgroup.Group{}
m.activePeers.Range(func(_, value interface{}) bool {
peer, ok := value.(models.Tunnel)
if !ok {
return true
}
errGroup.Go(func() error {
return m.RemovePeer(peer)
})
return true
})
return errGroup.Wait()
}
func (m *Manager) Stop() error {
// Remove all peers, then stop the thread and close the channels
err := m.removeAllPeers()
if err != nil {
return err
}
m.shutdownChan <- struct{}{}
<-m.shutdownConfirmChan
return nil
}
func (m *Manager) initializeTunnels() error {
tunnels, err := models.ListWireguardTunnels(m.db)
if err != nil {
return err
}
errGroup := &errgroup.Group{}
for _, tunnel := range tunnels {
tunnel := tunnel
errGroup.Go(func() error {
return m.AddPeer(tunnel)
})
}
return errGroup.Wait()
}
func (m *Manager) run() {
for {
select {
case peer := <-m.peerAddChan:
go m.addPeer(peer)
case peer := <-m.peerRemoveChan:
go m.removePeer(peer)
case <-m.shutdownChan:
close(m.peerAddChan)
close(m.peerRemoveChan)
close(m.peerAddConfirmChan)
close(m.peerRemoveConfirmChan)
m.shutdownConfirmChan <- struct{}{}
return
}
}
}
func GenerateWireguardInterfaceName(peer models.Tunnel) string {
if peer.WireguardServerKey != "" {
return fmt.Sprintf("wgs%d", peer.ID)
}
return fmt.Sprintf("wgc%d", peer.ID)
}
type WG struct {
netlink.LinkAttrs
}
func (wglink *WG) Attrs() *netlink.LinkAttrs {
return &wglink.LinkAttrs
}
func (wglink *WG) Type() string {
return "wireguard"
}
func (m *Manager) addPeer(peer models.Tunnel) {
// Create a new wireguard interface listening on the port from the peer tunnel
// If the peer is a client, then the password is the public key of the client
// If the peer is a server, then the password is the private key of the server
iface := GenerateWireguardInterfaceName(peer)
// Check if device exists
wgdev, err := netlink.LinkByName(iface)
if err == nil {
log.Println("wireguard interface already exists", iface)
} else {
la := netlink.NewLinkAttrs()
la.Name = iface
la.MTU = 1420
wgdev = &WG{LinkAttrs: la}
err := netlink.LinkAdd(wgdev)
if err != nil {
log.Println("failed to add wireguard device", err)
return
}
}
// Check if link is up
if wgdev.Attrs().Flags&net.FlagUp == 0 {
err = netlink.LinkSetUp(wgdev)
if err != nil {
log.Println("failed to bring up wireguard device", err)
return
}
}
// Add an IP address to the interface
peerIP := net.ParseIP(peer.IP)
if peer.WireguardServerKey == "" {
// Add one to the peer IP for the client side
peerIP = peerIP.To4()
peerIP[3]++
if peerIP[3] == 0 {
peerIP[2]++
peerIP[3] = 1
if peerIP[2] == 0 {
peerIP[1]++
if peerIP[1] == 0 {
peerIP[0]++
}
}
}
}
err = netlink.AddrReplace(wgdev, &netlink.Addr{IPNet: &net.IPNet{IP: peerIP, Mask: net.CIDRMask(32, 32)}})
if err != nil {
log.Println("failed to add address to wireguard device", err)
return
}
var privkey wgtypes.Key
portInt := int(peer.WireguardPort)
var peers []wgtypes.PeerConfig
_, netip, err := net.ParseCIDR("0.0.0.0/0")
if err != nil {
log.Println("failed to parse 0.0.0.0/0", err)
return
}
duration, err := time.ParseDuration("25s")
if err != nil {
log.Println("failed to parse duration", err)
return
}
if peer.WireguardServerKey != "" {
var err error
privkey, err = wgtypes.ParseKey(peer.WireguardServerKey)
if err != nil {
log.Println("failed to parse server key", err)
return
}
// tunnel.Password is our server pubkey + client privkey + client pubkey
pubkeyPart := peer.Password[88:]
clientPubkey, err := wgtypes.ParseKey(pubkeyPart)
if err != nil {
log.Println("failed to parse client pubkey", err)
return
}
peers = []wgtypes.PeerConfig{
{
PublicKey: clientPubkey,
AllowedIPs: []net.IPNet{*netip},
PersistentKeepaliveInterval: &duration,
},
}
} else {
var err error
portInt = freeport.GetPort()
// tunnel.Password is the server pubkey + client privkey + client pubkey
serverPubkeyStr := peer.Password[:44]
serverPubkey, err := wgtypes.ParseKey(serverPubkeyStr)
if err != nil {
log.Println("failed to parse server pubkey", err)
return
}
clientPrivkeyStr := peer.Password[44:88]
privkey, err = wgtypes.ParseKey(clientPrivkeyStr)
if err != nil {
log.Println("failed to parse client privkey", err)
return
}
// Parse tunnel.Hostname as an address and port
hostnameParts := strings.Split(peer.Hostname, ":")
if len(hostnameParts) != 2 {
log.Println("invalid hostname", peer.Hostname)
return
}
port64, err := strconv.ParseInt(hostnameParts[1], 10, 32)
if err != nil {
log.Println("failed to parse port", err)
return
}
port := int(port64)
// Check if the hostname is an IP address or a domain name
if net.ParseIP(hostnameParts[0]) == nil {
// It's a domain name
ips, err := net.LookupIP(hostnameParts[0])
if err != nil {
log.Println("failed to lookup hostname", hostnameParts[0], ":", err)
return
}
if len(ips) == 0 {
log.Println("no IPs found for hostname", hostnameParts[0])
return
}
hostnameParts[0] = ips[0].String()
}
peers = []wgtypes.PeerConfig{
{
PublicKey: serverPubkey,
AllowedIPs: []net.IPNet{*netip},
PersistentKeepaliveInterval: &duration,
Endpoint: &net.UDPAddr{IP: net.ParseIP(hostnameParts[0]), Port: port},
},
}
}
err = m.wgClient.ConfigureDevice(iface, wgtypes.Config{
PrivateKey: &privkey,
ListenPort: &portInt,
ReplacePeers: true,
Peers: peers,
})
if err != nil {
log.Println("failed to configure wireguard device", iface, ":", err)
return
}
log.Println("added wireguard device", iface)
m.activePeers.Store(iface, peer)
m.peerAddConfirmChan <- peer
}
func (m *Manager) removePeer(peer models.Tunnel) {
iface := GenerateWireguardInterfaceName(peer)
_, ok := m.activePeers.LoadAndDelete(iface)
if !ok {
m.peerRemoveConfirmChan <- peer
return
}
// Check if device exists
wgdev, err := netlink.LinkByName(iface)
if err != nil {
log.Println("wireguard interface does not exist", iface)
m.peerRemoveConfirmChan <- peer
return
}
err = netlink.LinkSetDown(wgdev)
if err != nil {
log.Println("failed to bring down wireguard device", err)
return
}
err = netlink.LinkDel(wgdev)
if err != nil {
log.Println("failed to delete wireguard device", err)
return
}
m.peerRemoveConfirmChan <- peer
}
func (m *Manager) AddPeer(peer models.Tunnel) error {
m.peerAddChan <- peer
ctx, cancel := context.WithTimeout(context.TODO(), defTimeout)
defer cancel()
return m.waitForPeerAddition(ctx, peer)
}
func (m *Manager) waitForPeerAddition(ctx context.Context, peer models.Tunnel) error {
select {
case <-m.shutdownChan:
return fmt.Errorf("wireguard manager is shutting down")
case <-ctx.Done():
log.Printf("peerAddConfirm timed out: %v\n", peer.Hostname)
return ctx.Err()
case addedPeer := <-m.peerAddConfirmChan:
if addedPeer.ID != peer.ID {
// Pop the wrong peer back onto the channel
m.peerAddConfirmChan <- addedPeer
return m.waitForPeerAddition(ctx, peer)
}
return nil
}
}
func (m *Manager) RemovePeer(peer models.Tunnel) error {
m.peerRemoveChan <- peer
ctx, cancel := context.WithTimeout(context.TODO(), defTimeout)
defer cancel()
return m.waitForPeerRemoval(ctx, peer)
}
func (m *Manager) waitForPeerRemoval(ctx context.Context, peer models.Tunnel) error {
select {
case <-m.shutdownChan:
return fmt.Errorf("wireguard manager is shutting down")
case <-ctx.Done():
log.Printf("peerRemoveConfirm timed out: %v\n", peer.Hostname)
return ctx.Err()
case addedPeer := <-m.peerRemoveConfirmChan:
if addedPeer.ID != peer.ID {
// Pop the wrong peer back onto the channel
m.peerRemoveConfirmChan <- addedPeer
return m.waitForPeerRemoval(ctx, peer)
}
return nil
}
}