mirror of
https://github.com/gravitl/netmaker.git
synced 2024-09-20 23:36:18 +08:00
359 lines
9.5 KiB
Go
359 lines
9.5 KiB
Go
package logic
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import (
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"errors"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"os/exec"
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"strconv"
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"strings"
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"time"
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"github.com/gravitl/netmaker/models"
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"github.com/gravitl/netmaker/netclient/ncutils"
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"golang.zx2c4.com/wireguard/wgctrl"
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"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
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)
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// GetSystemPeers - gets the server peers
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func GetSystemPeers(node *models.Node) (map[string]string, error) {
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peers := make(map[string]string)
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client, err := wgctrl.New()
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if err != nil {
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return peers, err
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}
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device, err := client.Device(node.Interface)
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if err != nil {
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return nil, err
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}
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for _, peer := range device.Peers {
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if IsBase64(peer.PublicKey.String()) && peer.Endpoint != nil && CheckEndpoint(peer.Endpoint.String()) {
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peers[peer.PublicKey.String()] = peer.Endpoint.String()
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}
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}
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return peers, nil
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}
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// RemoveConf - removes a configuration for a given WireGuard interface
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func RemoveConf(iface string, printlog bool) error {
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var err error
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confPath := ncutils.GetNetclientPathSpecific() + iface + ".conf"
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err = removeWGQuickConf(confPath, printlog)
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return err
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}
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// == Private Methods ==
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func setWGConfig(node models.Node, network string, peerupdate bool) error {
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node.SetID()
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peers, hasGateway, gateways, err := GetServerPeers(node.MacAddress, node.Network, node.IsDualStack == "yes", node.IsIngressGateway == "yes")
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if err != nil {
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return err
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}
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privkey, err := FetchPrivKey(node.ID)
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if err != nil {
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return err
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}
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if peerupdate {
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var iface string
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iface = node.Interface
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err = setServerPeers(iface, node.PersistentKeepalive, peers)
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Log("updated peers on server "+node.Name, 2)
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} else {
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err = initWireguard(&node, privkey, peers, hasGateway, gateways)
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Log("finished setting wg config on server "+node.Name, 3)
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}
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return err
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}
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func initWireguard(node *models.Node, privkey string, peers []wgtypes.PeerConfig, hasGateway bool, gateways []string) error {
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key, err := wgtypes.ParseKey(privkey)
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if err != nil {
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return err
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}
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wgclient, err := wgctrl.New()
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if err != nil {
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return err
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}
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defer wgclient.Close()
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var ifacename string
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if node.Interface != "" {
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ifacename = node.Interface
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} else {
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Log("no server interface provided to configure", 2)
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}
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if node.Address == "" {
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Log("no server address to provided configure", 2)
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}
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if ncutils.IsKernel() {
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Log("setting kernel device "+ifacename, 2)
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setKernelDevice(ifacename, node.Address)
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}
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nodeport := int(node.ListenPort)
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var conf = wgtypes.Config{
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PrivateKey: &key,
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ListenPort: &nodeport,
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ReplacePeers: true,
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Peers: peers,
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}
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if !ncutils.IsKernel() {
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var newConf string
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newConf, _ = ncutils.CreateUserSpaceConf(node.Address, key.String(), strconv.FormatInt(int64(node.ListenPort), 10), node.MTU, node.PersistentKeepalive, peers)
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confPath := ncutils.GetNetclientPathSpecific() + ifacename + ".conf"
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Log("writing wg conf file to: "+confPath, 1)
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err = ioutil.WriteFile(confPath, []byte(newConf), 0644)
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if err != nil {
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Log("error writing wg conf file to "+confPath+": "+err.Error(), 1)
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return err
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}
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// spin up userspace + apply the conf file
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var deviceiface = ifacename
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d, _ := wgclient.Device(deviceiface)
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for d != nil && d.Name == deviceiface {
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_ = RemoveConf(ifacename, false) // remove interface first
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time.Sleep(time.Second >> 2)
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d, _ = wgclient.Device(deviceiface)
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}
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time.Sleep(time.Second >> 2)
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err = applyWGQuickConf(confPath)
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if err != nil {
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Log("failed to create wireguard interface", 1)
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return err
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}
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} else {
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ipExec, err := exec.LookPath("ip")
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if err != nil {
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return err
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}
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_, err = wgclient.Device(ifacename)
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if err != nil {
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if os.IsNotExist(err) {
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fmt.Println("Device does not exist: ")
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fmt.Println(err)
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} else {
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return errors.New("Unknown config error: " + err.Error())
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}
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}
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err = wgclient.ConfigureDevice(ifacename, conf)
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if err != nil {
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if os.IsNotExist(err) {
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fmt.Println("Device does not exist: ")
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fmt.Println(err)
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} else {
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fmt.Printf("This is inconvenient: %v", err)
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}
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}
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if _, err := ncutils.RunCmd(ipExec+" link set down dev "+ifacename, false); err != nil {
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Log("attempted to remove interface before editing", 2)
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return err
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}
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if node.PostDown != "" {
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runcmds := strings.Split(node.PostDown, "; ")
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_ = ncutils.RunCmds(runcmds, true)
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}
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// set MTU of node interface
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if _, err := ncutils.RunCmd(ipExec+" link set mtu "+strconv.Itoa(int(node.MTU))+" up dev "+ifacename, true); err != nil {
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Log("failed to create interface with mtu "+strconv.Itoa(int(node.MTU))+" - "+ifacename, 2)
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return err
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}
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if node.PostUp != "" {
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runcmds := strings.Split(node.PostUp, "; ")
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_ = ncutils.RunCmds(runcmds, true)
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}
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if hasGateway {
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for _, gateway := range gateways {
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_, _ = ncutils.RunCmd(ipExec+" -4 route add "+gateway+" dev "+ifacename, true)
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}
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}
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if node.Address6 != "" && node.IsDualStack == "yes" {
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log.Println("[netclient] adding address: "+node.Address6, 1)
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_, _ = ncutils.RunCmd(ipExec+" address add dev "+ifacename+" "+node.Address6+"/64", true)
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}
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}
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return err
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}
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func setKernelDevice(ifacename string, address string) error {
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ipExec, err := exec.LookPath("ip")
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if err != nil {
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return err
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}
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_, _ = ncutils.RunCmd("ip link delete dev "+ifacename, false)
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_, _ = ncutils.RunCmd(ipExec+" link add dev "+ifacename+" type wireguard", true)
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_, _ = ncutils.RunCmd(ipExec+" address add dev "+ifacename+" "+address+"/24", true) // this is a bug waiting to happen
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return nil
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}
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func applyWGQuickConf(confPath string) error {
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if _, err := ncutils.RunCmd("wg-quick up "+confPath, true); err != nil {
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return err
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}
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return nil
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}
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func removeWGQuickConf(confPath string, printlog bool) error {
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if _, err := ncutils.RunCmd("wg-quick down "+confPath, printlog); err != nil {
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return err
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}
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return nil
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}
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func setServerPeers(iface string, keepalive int32, peers []wgtypes.PeerConfig) error {
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client, err := wgctrl.New()
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if err != nil {
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Log("failed to start wgctrl", 0)
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return err
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}
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device, err := client.Device(iface)
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if err != nil {
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Log("failed to parse interface", 0)
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return err
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}
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devicePeers := device.Peers
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if len(devicePeers) > 1 && len(peers) == 0 {
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Log("no peers pulled", 1)
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return err
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}
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for _, peer := range peers {
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for _, currentPeer := range devicePeers {
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if currentPeer.AllowedIPs[0].String() == peer.AllowedIPs[0].String() &&
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currentPeer.PublicKey.String() != peer.PublicKey.String() {
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_, err := ncutils.RunCmd("wg set "+iface+" peer "+currentPeer.PublicKey.String()+" remove", true)
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if err != nil {
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log.Println("error removing peer", peer.Endpoint.String())
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}
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}
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}
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udpendpoint := peer.Endpoint.String()
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var allowedips string
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var iparr []string
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for _, ipaddr := range peer.AllowedIPs {
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iparr = append(iparr, ipaddr.String())
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}
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allowedips = strings.Join(iparr, ",")
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keepAliveString := strconv.Itoa(int(keepalive))
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if keepAliveString == "0" {
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keepAliveString = "5"
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}
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if peer.Endpoint != nil {
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_, err = ncutils.RunCmd("wg set "+iface+" peer "+peer.PublicKey.String()+
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" endpoint "+udpendpoint+
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" persistent-keepalive "+keepAliveString+
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" allowed-ips "+allowedips, true)
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} else {
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_, err = ncutils.RunCmd("wg set "+iface+" peer "+peer.PublicKey.String()+
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" persistent-keepalive "+keepAliveString+
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" allowed-ips "+allowedips, true)
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}
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if err != nil {
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Log("error setting peer "+peer.PublicKey.String(), 1)
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}
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}
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for _, currentPeer := range devicePeers {
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shouldDelete := true
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for _, peer := range peers {
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if peer.AllowedIPs[0].String() == currentPeer.AllowedIPs[0].String() {
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shouldDelete = false
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}
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}
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if shouldDelete {
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output, err := ncutils.RunCmd("wg set "+iface+" peer "+currentPeer.PublicKey.String()+" remove", true)
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if err != nil {
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log.Println(output, "error removing peer", currentPeer.PublicKey.String())
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}
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}
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}
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return nil
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}
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func setWGKeyConfig(node models.Node) error {
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node.SetID()
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privatekey, err := wgtypes.GeneratePrivateKey()
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if err != nil {
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return err
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}
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privkeystring := privatekey.String()
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publickey := privatekey.PublicKey()
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node.PublicKey = publickey.String()
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err = StorePrivKey(node.ID, privkeystring)
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if err != nil {
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return err
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}
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if node.Action == models.NODE_UPDATE_KEY {
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node.Action = models.NODE_NOOP
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}
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return setWGConfig(node, node.Network, false)
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}
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func removeLocalServer(node *models.Node) error {
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var ifacename = node.Interface
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var err error
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if ifacename != "" {
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if !ncutils.IsKernel() {
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if err = RemoveConf(ifacename, true); err == nil {
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Log("removed WireGuard interface: "+ifacename, 1)
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}
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} else {
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ipExec, err := exec.LookPath("ip")
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if err != nil {
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return err
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}
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out, err := ncutils.RunCmd(ipExec+" link del "+ifacename, false)
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dontprint := strings.Contains(out, "does not exist") || strings.Contains(out, "Cannot find device")
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if err != nil && !dontprint {
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Log("error running command: "+ipExec+" link del "+ifacename, 1)
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Log(out, 1)
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}
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if node.PostDown != "" {
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runcmds := strings.Split(node.PostDown, "; ")
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_ = ncutils.RunCmds(runcmds, false)
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}
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}
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}
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home := ncutils.GetNetclientPathSpecific()
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if ncutils.FileExists(home + "netconfig-" + node.Network) {
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_ = os.Remove(home + "netconfig-" + node.Network)
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}
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if ncutils.FileExists(home + "nettoken-" + node.Network) {
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_ = os.Remove(home + "nettoken-" + node.Network)
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}
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if ncutils.FileExists(home + "secret-" + node.Network) {
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_ = os.Remove(home + "secret-" + node.Network)
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}
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if ncutils.FileExists(home + "wgkey-" + node.Network) {
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_ = os.Remove(home + "wgkey-" + node.Network)
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}
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if ncutils.FileExists(home + "nm-" + node.Network + ".conf") {
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_ = os.Remove(home + "nm-" + node.Network + ".conf")
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}
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return err
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}
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