mirror of
https://github.com/netbirdio/netbird.git
synced 2024-12-01 04:23:44 +01:00
370 lines
8.8 KiB
Go
370 lines
8.8 KiB
Go
package configurer
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import (
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"encoding/hex"
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"fmt"
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"net"
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"os"
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"runtime"
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"strconv"
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"strings"
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"time"
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log "github.com/sirupsen/logrus"
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"golang.zx2c4.com/wireguard/device"
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"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
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nbnet "github.com/netbirdio/netbird/util/net"
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)
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var ErrAllowedIPNotFound = fmt.Errorf("allowed IP not found")
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type WGUSPConfigurer struct {
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device *device.Device
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deviceName string
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uapiListener net.Listener
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}
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func NewUSPConfigurer(device *device.Device, deviceName string) *WGUSPConfigurer {
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wgCfg := &WGUSPConfigurer{
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device: device,
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deviceName: deviceName,
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}
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wgCfg.startUAPI()
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return wgCfg
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}
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func (c *WGUSPConfigurer) ConfigureInterface(privateKey string, port int) error {
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log.Debugf("adding Wireguard private key")
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key, err := wgtypes.ParseKey(privateKey)
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if err != nil {
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return err
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}
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fwmark := getFwmark()
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config := wgtypes.Config{
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PrivateKey: &key,
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ReplacePeers: true,
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FirewallMark: &fwmark,
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ListenPort: &port,
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}
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return c.device.IpcSet(toWgUserspaceString(config))
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}
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func (c *WGUSPConfigurer) UpdatePeer(peerKey string, allowedIps string, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error {
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// parse allowed ips
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_, ipNet, err := net.ParseCIDR(allowedIps)
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if err != nil {
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return err
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}
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peerKeyParsed, err := wgtypes.ParseKey(peerKey)
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if err != nil {
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return err
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}
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peer := wgtypes.PeerConfig{
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PublicKey: peerKeyParsed,
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ReplaceAllowedIPs: false,
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// don't replace allowed ips, wg will handle duplicated peer IP
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AllowedIPs: []net.IPNet{*ipNet},
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PersistentKeepaliveInterval: &keepAlive,
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PresharedKey: preSharedKey,
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Endpoint: endpoint,
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}
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config := wgtypes.Config{
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Peers: []wgtypes.PeerConfig{peer},
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}
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return c.device.IpcSet(toWgUserspaceString(config))
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}
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func (c *WGUSPConfigurer) RemovePeer(peerKey string) error {
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peerKeyParsed, err := wgtypes.ParseKey(peerKey)
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if err != nil {
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return err
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}
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peer := wgtypes.PeerConfig{
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PublicKey: peerKeyParsed,
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Remove: true,
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}
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config := wgtypes.Config{
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Peers: []wgtypes.PeerConfig{peer},
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}
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return c.device.IpcSet(toWgUserspaceString(config))
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}
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func (c *WGUSPConfigurer) AddAllowedIP(peerKey string, allowedIP string) error {
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_, ipNet, err := net.ParseCIDR(allowedIP)
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if err != nil {
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return err
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}
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peerKeyParsed, err := wgtypes.ParseKey(peerKey)
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if err != nil {
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return err
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}
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peer := wgtypes.PeerConfig{
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PublicKey: peerKeyParsed,
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UpdateOnly: true,
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ReplaceAllowedIPs: false,
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AllowedIPs: []net.IPNet{*ipNet},
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}
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config := wgtypes.Config{
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Peers: []wgtypes.PeerConfig{peer},
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}
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return c.device.IpcSet(toWgUserspaceString(config))
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}
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func (c *WGUSPConfigurer) RemoveAllowedIP(peerKey string, ip string) error {
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ipc, err := c.device.IpcGet()
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if err != nil {
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return err
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}
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peerKeyParsed, err := wgtypes.ParseKey(peerKey)
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if err != nil {
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return err
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}
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hexKey := hex.EncodeToString(peerKeyParsed[:])
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lines := strings.Split(ipc, "\n")
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peer := wgtypes.PeerConfig{
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PublicKey: peerKeyParsed,
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UpdateOnly: true,
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ReplaceAllowedIPs: true,
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AllowedIPs: []net.IPNet{},
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}
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foundPeer := false
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removedAllowedIP := false
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for _, line := range lines {
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line = strings.TrimSpace(line)
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// If we're within the details of the found peer and encounter another public key,
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// this means we're starting another peer's details. So, reset the flag.
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if strings.HasPrefix(line, "public_key=") && foundPeer {
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foundPeer = false
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}
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// Identify the peer with the specific public key
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if line == fmt.Sprintf("public_key=%s", hexKey) {
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foundPeer = true
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}
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// If we're within the details of the found peer and find the specific allowed IP, skip this line
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if foundPeer && line == "allowed_ip="+ip {
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removedAllowedIP = true
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continue
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}
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// Append the line to the output string
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if foundPeer && strings.HasPrefix(line, "allowed_ip=") {
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allowedIP := strings.TrimPrefix(line, "allowed_ip=")
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_, ipNet, err := net.ParseCIDR(allowedIP)
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if err != nil {
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return err
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}
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peer.AllowedIPs = append(peer.AllowedIPs, *ipNet)
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}
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}
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if !removedAllowedIP {
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return ErrAllowedIPNotFound
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}
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config := wgtypes.Config{
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Peers: []wgtypes.PeerConfig{peer},
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}
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return c.device.IpcSet(toWgUserspaceString(config))
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}
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// startUAPI starts the UAPI listener for managing the WireGuard interface via external tool
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func (t *WGUSPConfigurer) startUAPI() {
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var err error
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t.uapiListener, err = openUAPI(t.deviceName)
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if err != nil {
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log.Errorf("failed to open uapi listener: %v", err)
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return
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}
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go func(uapi net.Listener) {
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for {
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uapiConn, uapiErr := uapi.Accept()
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if uapiErr != nil {
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log.Tracef("%s", uapiErr)
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return
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}
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go func() {
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t.device.IpcHandle(uapiConn)
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}()
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}
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}(t.uapiListener)
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}
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func (t *WGUSPConfigurer) Close() {
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if t.uapiListener != nil {
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err := t.uapiListener.Close()
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if err != nil {
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log.Errorf("failed to close uapi listener: %v", err)
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}
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}
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if runtime.GOOS == "linux" {
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sockPath := "/var/run/wireguard/" + t.deviceName + ".sock"
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if _, statErr := os.Stat(sockPath); statErr == nil {
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_ = os.Remove(sockPath)
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}
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}
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}
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func (t *WGUSPConfigurer) GetStats(peerKey string) (WGStats, error) {
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ipc, err := t.device.IpcGet()
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if err != nil {
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return WGStats{}, fmt.Errorf("ipc get: %w", err)
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}
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stats, err := findPeerInfo(ipc, peerKey, []string{
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"last_handshake_time_sec",
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"last_handshake_time_nsec",
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"tx_bytes",
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"rx_bytes",
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})
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if err != nil {
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return WGStats{}, fmt.Errorf("find peer info: %w", err)
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}
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sec, err := strconv.ParseInt(stats["last_handshake_time_sec"], 10, 64)
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if err != nil {
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return WGStats{}, fmt.Errorf("parse handshake sec: %w", err)
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}
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nsec, err := strconv.ParseInt(stats["last_handshake_time_nsec"], 10, 64)
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if err != nil {
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return WGStats{}, fmt.Errorf("parse handshake nsec: %w", err)
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}
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txBytes, err := strconv.ParseInt(stats["tx_bytes"], 10, 64)
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if err != nil {
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return WGStats{}, fmt.Errorf("parse tx_bytes: %w", err)
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}
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rxBytes, err := strconv.ParseInt(stats["rx_bytes"], 10, 64)
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if err != nil {
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return WGStats{}, fmt.Errorf("parse rx_bytes: %w", err)
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}
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return WGStats{
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LastHandshake: time.Unix(sec, nsec),
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TxBytes: txBytes,
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RxBytes: rxBytes,
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}, nil
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}
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func findPeerInfo(ipcInput string, peerKey string, searchConfigKeys []string) (map[string]string, error) {
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peerKeyParsed, err := wgtypes.ParseKey(peerKey)
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if err != nil {
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return nil, fmt.Errorf("parse key: %w", err)
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}
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hexKey := hex.EncodeToString(peerKeyParsed[:])
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lines := strings.Split(ipcInput, "\n")
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configFound := map[string]string{}
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foundPeer := false
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for _, line := range lines {
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line = strings.TrimSpace(line)
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// If we're within the details of the found peer and encounter another public key,
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// this means we're starting another peer's details. So, stop.
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if strings.HasPrefix(line, "public_key=") && foundPeer {
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break
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}
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// Identify the peer with the specific public key
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if line == fmt.Sprintf("public_key=%s", hexKey) {
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foundPeer = true
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}
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for _, key := range searchConfigKeys {
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if foundPeer && strings.HasPrefix(line, key+"=") {
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v := strings.SplitN(line, "=", 2)
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configFound[v[0]] = v[1]
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}
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}
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}
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// todo: use multierr
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for _, key := range searchConfigKeys {
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if _, ok := configFound[key]; !ok {
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return configFound, fmt.Errorf("config key not found: %s", key)
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}
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}
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if !foundPeer {
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return nil, fmt.Errorf("%w: %s", ErrPeerNotFound, peerKey)
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}
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return configFound, nil
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}
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func toWgUserspaceString(wgCfg wgtypes.Config) string {
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var sb strings.Builder
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if wgCfg.PrivateKey != nil {
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hexKey := hex.EncodeToString(wgCfg.PrivateKey[:])
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sb.WriteString(fmt.Sprintf("private_key=%s\n", hexKey))
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}
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if wgCfg.ListenPort != nil {
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sb.WriteString(fmt.Sprintf("listen_port=%d\n", *wgCfg.ListenPort))
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}
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if wgCfg.ReplacePeers {
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sb.WriteString("replace_peers=true\n")
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}
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if wgCfg.FirewallMark != nil {
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sb.WriteString(fmt.Sprintf("fwmark=%d\n", *wgCfg.FirewallMark))
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}
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for _, p := range wgCfg.Peers {
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hexKey := hex.EncodeToString(p.PublicKey[:])
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sb.WriteString(fmt.Sprintf("public_key=%s\n", hexKey))
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if p.PresharedKey != nil {
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preSharedHexKey := hex.EncodeToString(p.PresharedKey[:])
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sb.WriteString(fmt.Sprintf("preshared_key=%s\n", preSharedHexKey))
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}
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if p.Remove {
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sb.WriteString("remove=true")
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}
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if p.ReplaceAllowedIPs {
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sb.WriteString("replace_allowed_ips=true\n")
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}
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for _, aip := range p.AllowedIPs {
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sb.WriteString(fmt.Sprintf("allowed_ip=%s\n", aip.String()))
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}
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if p.Endpoint != nil {
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sb.WriteString(fmt.Sprintf("endpoint=%s\n", p.Endpoint.String()))
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}
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if p.PersistentKeepaliveInterval != nil {
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sb.WriteString(fmt.Sprintf("persistent_keepalive_interval=%d\n", int(p.PersistentKeepaliveInterval.Seconds())))
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}
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}
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return sb.String()
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}
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func getFwmark() int {
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if runtime.GOOS == "linux" && !nbnet.CustomRoutingDisabled() {
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return nbnet.NetbirdFwmark
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}
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return 0
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}
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