/
client.go
287 lines (238 loc) · 6.96 KB
/
client.go
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package deployer
import (
"context"
"errors"
"fmt"
"log"
"net"
"os"
"strings"
"time"
"github.com/vishvananda/netlink"
"golang.zx2c4.com/wireguard/wgctrl"
"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
)
type WireGuard struct {
netlink.LinkAttrs
}
func (w *WireGuard) Attrs() *netlink.LinkAttrs {
return &w.LinkAttrs
}
func (w *WireGuard) Type() string {
return "wireguard"
}
type client struct {
k8s *kubernetes.Clientset
allowedIPs []string
peerIP string
}
func NewClient(cs *kubernetes.Clientset, allowedIPs []string, peerIP string) *client {
return &client{
k8s: cs,
allowedIPs: allowedIPs,
peerIP: peerIP,
}
}
func (c *client) JoinServerAsPeer(ctx context.Context) {
// check if this client already has a wg0 interface
c.ensureLocalWireguardLink(ctx)
// configure device to be a peer of the k8s wg server
dev := c.ensureLinkDeviceConfigured(ctx)
// add peer to server config
log.Default().Printf("got device %s with public key %s", dev.Name, dev.PublicKey)
c.ensurePeerOnServer(ctx, dev)
}
func (c *client) ensurePeerOnServer(ctx context.Context, wgDev *wgtypes.Device) {
wgSec, err := c.k8s.CoreV1().Secrets(kubeSystemNS).Get(ctx, wireguardSecretName, metav1.GetOptions{})
if err != nil {
log.Fatal(err)
}
base64Sec := wgSec.Data[serverConfigTemplateFile]
if len(base64Sec) == 0 {
log.Fatalf("expected data, got nothing")
}
if strings.Contains(string(base64Sec), wgDev.PublicKey.String()) {
log.Default().Printf("server already configured with peer %s, skipping rolling server pods", wgDev.PublicKey)
return
}
updatedSec := strings.Builder{}
updatedSec.WriteString(string(base64Sec))
updatedSec.WriteString("\n")
updatedSec.WriteString("[Peer]\n")
updatedSec.WriteString(fmt.Sprintf("PublicKey = %s\n", wgDev.PublicKey))
updatedSec.WriteString(fmt.Sprintf("AllowedIPs = %s\n", c.peerIP))
// update the secret
wgSec.Data[serverConfigTemplateFile] = []byte(updatedSec.String())
_, err = c.k8s.CoreV1().Secrets(kubeSystemNS).Update(ctx, wgSec, metav1.UpdateOptions{})
if err != nil {
log.Fatalf("failed to update secret %s", err)
}
deployment, err := c.k8s.AppsV1().Deployments(kubeSystemNS).Get(ctx, wireguardSecretName, metav1.GetOptions{})
if err != nil {
log.Fatalf("failed to get deployment %s", err)
}
if deployment.Spec.Template.Annotations == nil {
deployment.Spec.Template.Annotations = map[string]string{}
}
deployment.Spec.Template.Annotations["restart.at/time"] = time.Now().String()
_, err = c.k8s.AppsV1().Deployments(kubeSystemNS).Update(ctx, deployment, metav1.UpdateOptions{})
if err != nil {
log.Fatalf("failed to update deployment %s", err)
}
}
func (c *client) ensureLinkDeviceConfigured(ctx context.Context) *wgtypes.Device {
wgSvc, err := c.k8s.CoreV1().Services("kube-system").Get(ctx, "wireguard", metav1.GetOptions{})
if err != nil {
log.Fatal(err)
}
if len(wgSvc.Status.LoadBalancer.Ingress) == 0 {
log.Fatal("no external IPs found on wireguard service, cant add as a peer")
}
wgSec, err := c.k8s.CoreV1().Secrets("kube-system").Get(ctx, "wireguard", metav1.GetOptions{})
if err != nil {
log.Fatal(err)
}
if wgSec.Annotations["azure.kubernetes.com/publickey"] == "" {
log.Fatalf("public key annotation missing from secret %s/%s", wgSec.Namespace, wgSec.Name)
}
serverPubKey, err := wgtypes.ParseKey(wgSec.Annotations["azure.kubernetes.com/publickey"])
if err != nil {
log.Fatal(err)
}
wgClient, err := wgctrl.New()
if err != nil {
log.Fatal(err)
}
dev, err := wgClient.Device("wg0")
if err != nil && !errors.Is(err, os.ErrNotExist) {
log.Fatalf("failed to check device wg0: %s", err)
}
serverAllowedIPs := []net.IPNet{}
// peer IP
_, ipNet, err := net.ParseCIDR(c.peerIP)
if err != nil {
log.Fatalf("failed to parse peerIP as CIDR: %s", err)
}
serverAllowedIPs = append(serverAllowedIPs, *ipNet)
// any allowed-ips from the cli
for _, ip := range c.allowedIPs {
_, ipNet, err = net.ParseCIDR(ip)
if err != nil {
log.Fatalf("failed to parse peerIP as CIDR: %s", err)
}
serverAllowedIPs = append(serverAllowedIPs, *ipNet)
}
var cfg wgtypes.Config
if dev == nil || dev.PrivateKey.String() == "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=" {
log.Default().Println("device wg0 not initialized, setting up for first time")
key, err := wgtypes.GeneratePrivateKey()
if err != nil {
log.Fatalf("could not generate new private key for wg0: %s", err)
}
cfg = wgtypes.Config{
PrivateKey: &key,
Peers: []wgtypes.PeerConfig{
{
PublicKey: serverPubKey,
Endpoint: &net.UDPAddr{
IP: net.ParseIP(wgSvc.Status.LoadBalancer.Ingress[0].IP),
Port: int(wgSvc.Spec.Ports[0].Port),
},
AllowedIPs: serverAllowedIPs,
},
},
}
err = wgClient.ConfigureDevice("wg0", cfg)
if err != nil {
log.Fatal(err)
}
dev, err = wgClient.Device("wg0")
if err != nil {
log.Fatal(err)
}
}
serverFound := false
for _, p := range dev.Peers {
if p.PublicKey == serverPubKey {
serverFound = true
}
}
if !serverFound {
log.Default().Printf("server key %s not found as peer, adding to wg0", serverPubKey)
cfg = wgtypes.Config{
PrivateKey: &dev.PrivateKey,
Peers: []wgtypes.PeerConfig{},
}
for _, p := range dev.Peers {
cfg.Peers = append(cfg.Peers, wgtypes.PeerConfig{
PublicKey: p.PublicKey,
AllowedIPs: p.AllowedIPs,
Endpoint: p.Endpoint,
})
}
// add server
cfg.Peers = append(cfg.Peers, wgtypes.PeerConfig{
PublicKey: serverPubKey,
Endpoint: &net.UDPAddr{
IP: net.ParseIP(wgSvc.Status.LoadBalancer.Ingress[0].IP),
Port: int(wgSvc.Spec.Ports[0].Port),
},
AllowedIPs: serverAllowedIPs,
})
err = wgClient.ConfigureDevice("wg0", cfg)
if err != nil {
log.Fatal(err)
}
dev, err = wgClient.Device("wg0")
if err != nil {
log.Fatal(err)
}
}
return dev
}
func (c *client) ensureLocalWireguardLink(ctx context.Context) {
la := netlink.NewLinkAttrs()
la.Name = "wg0"
dev := &WireGuard{LinkAttrs: la}
err := netlink.LinkAdd(dev)
if err != nil && !errors.Is(err, os.ErrExist) {
panic(err)
}
link, err := netlink.LinkByName("wg0")
if err != nil {
log.Fatal(err)
}
// add peerIP as address
_, ipNet, err := net.ParseCIDR(c.peerIP)
if err != nil {
log.Fatalf("could not parse peerIP %s as CIDR: %s", c.peerIP, err)
}
addr := netlink.Addr{
IPNet: ipNet,
}
err = netlink.AddrAdd(link, &addr)
if err != nil && !errors.Is(err, os.ErrExist) {
log.Fatal(err)
}
err = netlink.LinkSetUp(link)
if err != nil {
log.Fatalf("failed to bring up link: %s", err)
}
// add routes for additional allowed-ips
for _, ip := range c.allowedIPs {
_, ipNet, err := net.ParseCIDR(ip)
if err != nil {
log.Fatalf("failed to parse allowed-ip %s as CIDR: %s", ip, err)
}
rt := netlink.Route{
Dst: ipNet,
LinkIndex: link.Attrs().Index,
}
err = netlink.RouteAdd(&rt)
if err != nil && !errors.Is(err, os.ErrExist) {
log.Fatalf("failed to add route %s", err)
}
}
}