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wg.go
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wg.go
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package wireguard
import (
"context"
"crypto/rand"
"encoding/base64"
"fmt"
"os"
"regexp"
"strings"
"github.com/oklog/ulid/v2"
"github.com/pkg/errors"
"github.com/spf13/viper"
"github.com/superfly/flyctl/api"
"github.com/superfly/flyctl/flyctl"
"github.com/superfly/flyctl/internal/config"
"github.com/superfly/flyctl/internal/state"
"github.com/superfly/flyctl/terminal"
"github.com/superfly/flyctl/wg"
"golang.org/x/crypto/curve25519"
)
var cleanDNSPattern = regexp.MustCompile(`[^a-zA-Z0-9\\-]`)
func generatePeerName(ctx context.Context, apiClient *api.Client) (string, error) {
user, err := apiClient.GetCurrentUser(ctx)
if err != nil {
return "", err
}
emailSlug := cleanDNSPattern.ReplaceAllString(user.Email, "-")
host, err := os.Hostname()
if err != nil {
return "", err
}
hostSlug := cleanDNSPattern.ReplaceAllString(strings.Split(host, ".")[0], "-")
name := fmt.Sprintf("%s-%s-%s", hostSlug, emailSlug, ulid.Make())
return name, nil
}
func StateForOrg(ctx context.Context, apiClient *api.Client, org *api.Organization, regionCode string, name string, recycle bool) (*wg.WireGuardState, error) {
state, err := getWireGuardStateForOrg(org.Slug)
if err != nil {
return nil, err
}
if state != nil && !recycle && state.Region == regionCode {
return state, nil
}
terminal.Debugf("Can't find matching WireGuard configuration; creating new one\n")
if name == "" {
n, err := generatePeerName(ctx, apiClient)
if err != nil {
return nil, err
}
name = fmt.Sprintf("interactive-agent-%s", n)
}
stateb, err := Create(apiClient, org, regionCode, name)
if err != nil {
return nil, err
}
if err := setWireGuardStateForOrg(ctx, org.Slug, stateb); err != nil {
return nil, err
}
return stateb, nil
}
func Create(apiClient *api.Client, org *api.Organization, regionCode, name string) (*wg.WireGuardState, error) {
ctx := context.TODO()
var (
err error
rx = regexp.MustCompile(`^[a-zA-Z0-9\\-]+$`)
)
if name == "" {
n, err := generatePeerName(ctx, apiClient)
if err != nil {
return nil, err
}
name = fmt.Sprintf("interactive-%s", n)
}
if regionCode == "" {
regionCode = os.Getenv("FLYCTL_WG_REGION")
}
if regionCode == "" {
region, err := apiClient.ClosestWireguardGatewayRegion(ctx)
if err != nil {
return nil, err
}
regionCode = region.Code
}
if !rx.MatchString(name) {
return nil, errors.New("name must consist solely of letters, numbers, and the dash character")
}
fmt.Printf("Creating WireGuard peer \"%s\" in region \"%s\" for organization %s\n", name, regionCode, org.Slug)
pubkey, privatekey := C25519pair()
data, err := apiClient.CreateWireGuardPeer(ctx, org, regionCode, name, pubkey)
if err != nil {
return nil, err
}
return &wg.WireGuardState{
Name: name,
Region: regionCode,
Org: org.Slug,
LocalPublic: pubkey,
LocalPrivate: privatekey,
Peer: *data,
}, nil
}
func C25519pair() (string, string) {
var private [32]byte
_, err := rand.Read(private[:])
if err != nil {
panic(fmt.Sprintf("reading from random: %s", err))
}
public, err := curve25519.X25519(private[:], curve25519.Basepoint)
if err != nil {
panic(fmt.Sprintf("can't mult: %s", err))
}
return base64.StdEncoding.EncodeToString(public),
base64.StdEncoding.EncodeToString(private[:])
}
type WireGuardStates map[string]*wg.WireGuardState
func GetWireGuardState() (WireGuardStates, error) {
states := WireGuardStates{}
if err := viper.UnmarshalKey(flyctl.ConfigWireGuardState, &states); err != nil {
return nil, errors.Wrap(err, "invalid wireguard state")
}
return states, nil
}
func getWireGuardStateForOrg(orgSlug string) (*wg.WireGuardState, error) {
states, err := GetWireGuardState()
if err != nil {
return nil, err
}
return states[orgSlug], nil
}
func setWireGuardState(ctx context.Context, s WireGuardStates) error {
viper.Set(flyctl.ConfigWireGuardState, s)
configPath := state.ConfigFile(ctx)
if err := config.SetWireGuardState(configPath, s); err != nil {
return errors.Wrap(err, "error saving config file")
}
return nil
}
func setWireGuardStateForOrg(ctx context.Context, orgSlug string, s *wg.WireGuardState) error {
states, err := GetWireGuardState()
if err != nil {
return err
}
states[orgSlug] = s
return setWireGuardState(ctx, states)
}
func PruneInvalidPeers(ctx context.Context, apiClient *api.Client) error {
state, err := GetWireGuardState()
if err != nil {
return nil
}
peerIPs := make([]string, 0, len(state))
for _, peer := range state {
peerIPs = append(peerIPs, peer.Peer.Peerip)
}
invalidPeerIPs, err := apiClient.ValidateWireGuardPeers(ctx, peerIPs)
if err != nil {
return err
}
for _, invalidPeerIP := range invalidPeerIPs {
for orgSlug, peer := range state {
if peer.Peer.Peerip == invalidPeerIP {
terminal.Debugf("removing invalid peer %s for organization %s", invalidPeerIP, orgSlug)
delete(state, orgSlug)
}
}
}
return setWireGuardState(ctx, state)
}