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Merge pull request #29 from cure/add-ephemeral-node-support

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Add support for ephemeral nodes via a special type of pre-auth key.
This commit is contained in:
Juan Font 2021-05-23 11:39:16 +02:00 committed by GitHub
commit 6a3b171e99
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17 changed files with 151 additions and 38 deletions
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9
README.md
View File

@ -22,7 +22,7 @@ Headscale implements this coordination server.
- [x] ~~Multiuser~~ Namespace support
- [x] Basic routing (advertise & accept)
- [ ] Share nodes between ~~users~~ namespaces
- [x] Node registration via pre-auth keys
- [x] Node registration via pre-auth keys (including reusable keys and ephemeral node support)
- [X] JSON-formatted output
- [ ] ACLs
- [ ] DNS
@ -97,6 +97,7 @@ Alternatively, you can use Auth Keys to register your machines:
tailscale up -login-server YOUR_HEADSCALE_URL --authkey YOURAUTHKEY
```
If you create an authkey with the `--ephemeral` flag, that key will create ephemeral nodes. This implies that `--reusable` is true.
Please bear in mind that all the commands from headscale support adding `-o json` or `-o json-line` to get a nicely JSON-formatted output.
@ -124,6 +125,12 @@ Headscale's configuration file is named `config.json` or `config.yaml`. Headscal
`derp_map_path` is the path to the [DERP](https://pkg.go.dev/tailscale.com/derp) map file. If the path is relative, it will be interpreted as relative to the directory the configuration file was read from.
```
"ephemeral_node_inactivity_timeout": "30m",
```
`ephemeral_node_inactivity_timeout` is the timeout after which inactive ephemeral node records will be deleted from the database. The default is 30 minutes. This value must be higher than 65 seconds (the keepalive timeout for the HTTP long poll is 60 seconds, plus a few seconds to avoid race conditions).
```
"db_host": "localhost",
"db_port": 5432,

17
api.go
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@ -93,7 +93,7 @@ func (h *Headscale) RegistrationHandler(c *gin.Context) {
// We do have the updated key!
if m.NodeKey == wgcfg.Key(req.NodeKey).HexString() {
if m.Registered {
log.Println("Client is registered and we have the current key. All clear to /map")
log.Printf("[%s] Client is registered and we have the current key. All clear to /map\n", m.Name)
resp.AuthURL = ""
resp.User = *m.Namespace.toUser()
resp.MachineAuthorized = true
@ -174,7 +174,7 @@ func (h *Headscale) PollNetMapHandler(c *gin.Context) {
defer db.Close()
var m Machine
if db.First(&m, "machine_key = ?", mKey.HexString()).RecordNotFound() {
log.Printf("Cannot fingitd machine: %s", err)
log.Printf("Ignoring request, cannot find machine with key %s", mKey.HexString())
return
}
@ -243,29 +243,34 @@ func (h *Headscale) PollNetMapHandler(c *gin.Context) {
log.Printf("[%s] Sending data (%d bytes)", m.Name, len(data))
_, err := w.Write(data)
if err != nil {
fmt.Printf("[%s] 🤮 Cannot write data: %s", m.Name, err)
log.Printf("[%s] 🤮 Cannot write data: %s", m.Name, err)
}
now := time.Now().UTC()
m.LastSeen = &now
db.Save(&m)
return true
case <-update:
log.Printf("[%s] Received a request for update", m.Name)
data, err := h.getMapResponse(mKey, req, m)
if err != nil {
fmt.Printf("[%s] 🤮 Cannot get the poll response: %s", m.Name, err)
log.Printf("[%s] 🤮 Cannot get the poll response: %s", m.Name, err)
}
_, err = w.Write(*data)
if err != nil {
fmt.Printf("[%s] 🤮 Cannot write the poll response: %s", m.Name, err)
log.Printf("[%s] 🤮 Cannot write the poll response: %s", m.Name, err)
}
return true
case <-c.Request.Context().Done():
log.Printf("[%s] 😥 The client has closed the connection", m.Name)
now := time.Now().UTC()
m.LastSeen = &now
db.Save(&m)
h.pollMu.Lock()
cancelKeepAlive <- []byte{}
delete(h.clientsPolling, m.ID)
h.pollMu.Unlock()
return false
}

61
app.go
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@ -8,6 +8,7 @@ import (
"os"
"strings"
"sync"
"time"
"github.com/gin-gonic/gin"
"golang.org/x/crypto/acme/autocert"
@ -17,10 +18,11 @@ import (
// Config contains the initial Headscale configuration
type Config struct {
ServerURL string
Addr string
PrivateKeyPath string
DerpMap *tailcfg.DERPMap
ServerURL string
Addr string
PrivateKeyPath string
DerpMap *tailcfg.DERPMap
EphemeralNodeInactivityTimeout time.Duration
DBtype string
DBpath string
@ -95,6 +97,51 @@ func (h *Headscale) redirect(w http.ResponseWriter, req *http.Request) {
http.Redirect(w, req, target, http.StatusFound)
}
// ExpireEphemeralNodes deletes ephemeral machine records that have not been
// seen for longer than h.cfg.EphemeralNodeInactivityTimeout
func (h *Headscale) ExpireEphemeralNodes(milliSeconds int64) {
if milliSeconds == 0 {
// For testing
h.expireEphemeralNodesWorker()
return
}
ticker := time.NewTicker(time.Duration(milliSeconds) * time.Millisecond)
for range ticker.C {
h.expireEphemeralNodesWorker()
}
}
func (h *Headscale) expireEphemeralNodesWorker() {
db, err := h.db()
if err != nil {
log.Printf("Cannot open DB: %s", err)
return
}
defer db.Close()
namespaces, err := h.ListNamespaces()
if err != nil {
log.Printf("Error listing namespaces: %s", err)
return
}
for _, ns := range *namespaces {
machines, err := h.ListMachinesInNamespace(ns.Name)
if err != nil {
log.Printf("Error listing machines in namespace %s: %s", ns.Name, err)
return
}
for _, m := range *machines {
if m.AuthKey != nil && m.LastSeen != nil && m.AuthKey.Ephemeral && time.Now().After(m.LastSeen.Add(h.cfg.EphemeralNodeInactivityTimeout)) {
log.Printf("[%s] Ephemeral client removed from database\n", m.Name)
err = db.Unscoped().Delete(m).Error
if err != nil {
log.Printf("[%s] 🤮 Cannot delete ephemeral machine from the database: %s", m.Name, err)
}
}
}
}
}
// Serve launches a GIN server with the Headscale API
func (h *Headscale) Serve() error {
r := gin.Default()
@ -105,7 +152,7 @@ func (h *Headscale) Serve() error {
var err error
if h.cfg.TLSLetsEncryptHostname != "" {
if !strings.HasPrefix(h.cfg.ServerURL, "https://") {
fmt.Println("WARNING: listening with TLS but ServerURL does not start with https://")
log.Println("WARNING: listening with TLS but ServerURL does not start with https://")
}
m := autocert.Manager{
@ -136,12 +183,12 @@ func (h *Headscale) Serve() error {
}
} else if h.cfg.TLSCertPath == "" {
if !strings.HasPrefix(h.cfg.ServerURL, "http://") {
fmt.Println("WARNING: listening without TLS but ServerURL does not start with http://")
log.Println("WARNING: listening without TLS but ServerURL does not start with http://")
}
err = r.Run(h.cfg.Addr)
} else {
if !strings.HasPrefix(h.cfg.ServerURL, "https://") {
fmt.Println("WARNING: listening with TLS but ServerURL does not start with https://")
log.Println("WARNING: listening with TLS but ServerURL does not start with https://")
}
err = r.RunTLS(h.cfg.Addr, h.cfg.TLSCertPath, h.cfg.TLSKeyPath)
}

4
cmd/headscale/cli/nodes.go
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@ -65,9 +65,9 @@ var ListNodesCmd = &cobra.Command{
log.Fatalf("Error getting nodes: %s", err)
}
fmt.Printf("name\t\tlast seen\n")
fmt.Printf("name\t\tlast seen\t\tephemeral\n")
for _, m := range *machines {
fmt.Printf("%s\t%s\n", m.Name, m.LastSeen.Format("2006-01-02 15:04:05"))
fmt.Printf("%s\t%s\t%t\n", m.Name, m.LastSeen.Format("2006-01-02 15:04:05"), m.AuthKey.Ephemeral)
}
},

6
cmd/headscale/cli/preauthkeys.go
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@ -45,10 +45,11 @@ var ListPreAuthKeys = &cobra.Command{
expiration = k.Expiration.Format("2006-01-02 15:04:05")
}
fmt.Printf(
"key: %s, namespace: %s, reusable: %v, expiration: %s, created_at: %s\n",
"key: %s, namespace: %s, reusable: %v, ephemeral: %v, expiration: %s, created_at: %s\n",
k.Key,
k.Namespace.Name,
k.Reusable,
k.Ephemeral,
expiration,
k.CreatedAt.Format("2006-01-02 15:04:05"),
)
@ -71,6 +72,7 @@ var CreatePreAuthKeyCmd = &cobra.Command{
log.Fatalf("Error initializing: %s", err)
}
reusable, _ := cmd.Flags().GetBool("reusable")
ephemeral, _ := cmd.Flags().GetBool("ephemeral")
e, _ := cmd.Flags().GetString("expiration")
var expiration *time.Time
@ -83,7 +85,7 @@ var CreatePreAuthKeyCmd = &cobra.Command{
expiration = &exp
}
k, err := h.CreatePreAuthKey(n, reusable, expiration)
k, err := h.CreatePreAuthKey(n, reusable, ephemeral, expiration)
if strings.HasPrefix(o, "json") {
JsonOutput(k, err, o)
return

1
cmd/headscale/cli/server.go
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@ -17,6 +17,7 @@ var ServeCmd = &cobra.Command{
if err != nil {
log.Fatalf("Error initializing: %s", err)
}
go h.ExpireEphemeralNodes(5000)
err = h.Serve()
if err != nil {
log.Fatalf("Error initializing: %s", err)

11
cmd/headscale/cli/utils.go
View File

@ -8,6 +8,7 @@ import (
"os"
"path/filepath"
"strings"
"time"
"github.com/juanfont/headscale"
"github.com/spf13/viper"
@ -37,12 +38,22 @@ func getHeadscaleApp() (*headscale.Headscale, error) {
log.Printf("Could not load DERP servers map file: %s", err)
}
// Minimum inactivity time out is keepalive timeout (60s) plus a few seconds
// to avoid races
minInactivityTimeout, _ := time.ParseDuration("65s")
if viper.GetDuration("ephemeral_node_inactivity_timeout") <= minInactivityTimeout {
err = fmt.Errorf("ephemeral_node_inactivity_timeout (%s) is set too low, must be more than %s\n", viper.GetString("ephemeral_node_inactivity_timeout"), minInactivityTimeout)
return nil, err
}
cfg := headscale.Config{
ServerURL: viper.GetString("server_url"),
Addr: viper.GetString("listen_addr"),
PrivateKeyPath: absPath(viper.GetString("private_key_path")),
DerpMap: derpMap,
EphemeralNodeInactivityTimeout: viper.GetDuration("ephemeral_node_inactivity_timeout"),
DBtype: viper.GetString("db_type"),
DBpath: absPath(viper.GetString("db_path")),
DBhost: viper.GetString("db_host"),

1
cmd/headscale/headscale.go
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@ -127,6 +127,7 @@ func main() {
cli.PreauthkeysCmd.AddCommand(cli.CreatePreAuthKeyCmd)
cli.CreatePreAuthKeyCmd.PersistentFlags().Bool("reusable", false, "Make the preauthkey reusable")
cli.CreatePreAuthKeyCmd.PersistentFlags().Bool("ephemeral", false, "Preauthkey for ephemeral nodes")
cli.CreatePreAuthKeyCmd.Flags().StringP("expiration", "e", "", "Human-readable expiration of the key (30m, 24h, 365d...)")
headscaleCmd.PersistentFlags().StringP("output", "o", "", "Output format. Empty for human-readable, 'json' or 'json-line'")

1
config.json.postgres.example
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@ -3,6 +3,7 @@
"listen_addr": "0.0.0.0:8000",
"private_key_path": "private.key",
"derp_map_path": "derp.yaml",
"ephemeral_node_inactivity_timeout": "30m",
"db_type": "postgres",
"db_host": "localhost",
"db_port": 5432,

1
config.json.sqlite.example
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@ -3,6 +3,7 @@
"listen_addr": "0.0.0.0:8000",
"private_key_path": "private.key",
"derp_map_path": "derp.yaml",
"ephemeral_node_inactivity_timeout": "30m",
"db_type": "sqlite3",
"db_path": "db.sqlite",
"tls_letsencrypt_hostname": "",

2
machine.go
View File

@ -131,7 +131,7 @@ func (m Machine) toNode() (*tailcfg.Node, error) {
n := tailcfg.Node{
ID: tailcfg.NodeID(m.ID), // this is the actual ID
StableID: tailcfg.StableNodeID(strconv.FormatUint(m.ID, 10)), // in headscale, unlike tailcontrol server, IDs are permantent
StableID: tailcfg.StableNodeID(strconv.FormatUint(m.ID, 10)), // in headscale, unlike tailcontrol server, IDs are permanent
Name: hostinfo.Hostname,
User: tailcfg.UserID(m.NamespaceID),
Key: tailcfg.NodeKey(nKey),

4
machine_test.go
View File

@ -4,13 +4,11 @@ import (
"gopkg.in/check.v1"
)
var _ = check.Suite(&Suite{})
func (s *Suite) TestGetMachine(c *check.C) {
n, err := h.CreateNamespace("test")
c.Assert(err, check.IsNil)
pak, err := h.CreatePreAuthKey(n.Name, false, nil)
pak, err := h.CreatePreAuthKey(n.Name, false, false, nil)
c.Assert(err, check.IsNil)
db, err := h.db()

2
namespaces.go
View File

@ -119,7 +119,7 @@ func (h *Headscale) ListMachinesInNamespace(name string) (*[]Machine, error) {
defer db.Close()
machines := []Machine{}
if err := db.Where(&Machine{NamespaceID: n.ID}).Find(&machines).Error; err != nil {
if err := db.Preload("AuthKey").Where(&Machine{NamespaceID: n.ID}).Find(&machines).Error; err != nil {
return nil, err
}
return &machines, nil

4
namespaces_test.go
View File

@ -4,8 +4,6 @@ import (
"gopkg.in/check.v1"
)
var _ = check.Suite(&Suite{})
func (s *Suite) TestCreateAndDestroyNamespace(c *check.C) {
n, err := h.CreateNamespace("test")
c.Assert(err, check.IsNil)
@ -29,7 +27,7 @@ func (s *Suite) TestDestroyNamespaceErrors(c *check.C) {
n, err := h.CreateNamespace("test")
c.Assert(err, check.IsNil)
pak, err := h.CreatePreAuthKey(n.Name, false, nil)
pak, err := h.CreatePreAuthKey(n.Name, false, false, nil)
c.Assert(err, check.IsNil)
db, err := h.db()

6
preauth_keys.go
View File

@ -18,13 +18,14 @@ type PreAuthKey struct {
NamespaceID uint
Namespace Namespace
Reusable bool
Ephemeral bool `gorm:"default:false"`
CreatedAt *time.Time
Expiration *time.Time
}
// CreatePreAuthKey creates a new PreAuthKey in a namespace, and returns it
func (h *Headscale) CreatePreAuthKey(namespaceName string, reusable bool, expiration *time.Time) (*PreAuthKey, error) {
func (h *Headscale) CreatePreAuthKey(namespaceName string, reusable bool, ephemeral bool, expiration *time.Time) (*PreAuthKey, error) {
n, err := h.GetNamespace(namespaceName)
if err != nil {
return nil, err
@ -48,6 +49,7 @@ func (h *Headscale) CreatePreAuthKey(namespaceName string, reusable bool, expira
NamespaceID: n.ID,
Namespace: *n,
Reusable: reusable,
Ephemeral: ephemeral,
CreatedAt: &now,
Expiration: expiration,
}
@ -94,7 +96,7 @@ func (h *Headscale) checkKeyValidity(k string) (*PreAuthKey, error) {
return nil, errorAuthKeyExpired
}
if pak.Reusable { // we don't need to check if has been used before
if pak.Reusable || pak.Ephemeral { // we don't need to check if has been used before
return &pak, nil
}

55
preauth_keys_test.go
View File

@ -7,14 +7,14 @@ import (
)
func (*Suite) TestCreatePreAuthKey(c *check.C) {
_, err := h.CreatePreAuthKey("bogus", true, nil)
_, err := h.CreatePreAuthKey("bogus", true, false, nil)
c.Assert(err, check.NotNil)
n, err := h.CreateNamespace("test")
c.Assert(err, check.IsNil)
k, err := h.CreatePreAuthKey(n.Name, true, nil)
k, err := h.CreatePreAuthKey(n.Name, true, false, nil)
c.Assert(err, check.IsNil)
// Did we get a valid key?
@ -40,7 +40,7 @@ func (*Suite) TestExpiredPreAuthKey(c *check.C) {
c.Assert(err, check.IsNil)
now := time.Now()
pak, err := h.CreatePreAuthKey(n.Name, true, &now)
pak, err := h.CreatePreAuthKey(n.Name, true, false, &now)
c.Assert(err, check.IsNil)
p, err := h.checkKeyValidity(pak.Key)
@ -58,7 +58,7 @@ func (*Suite) TestValidateKeyOk(c *check.C) {
n, err := h.CreateNamespace("test3")
c.Assert(err, check.IsNil)
pak, err := h.CreatePreAuthKey(n.Name, true, nil)
pak, err := h.CreatePreAuthKey(n.Name, true, false, nil)
c.Assert(err, check.IsNil)
p, err := h.checkKeyValidity(pak.Key)
@ -70,7 +70,7 @@ func (*Suite) TestAlreadyUsedKey(c *check.C) {
n, err := h.CreateNamespace("test4")
c.Assert(err, check.IsNil)
pak, err := h.CreatePreAuthKey(n.Name, false, nil)
pak, err := h.CreatePreAuthKey(n.Name, false, false, nil)
c.Assert(err, check.IsNil)
db, err := h.db()
@ -100,7 +100,7 @@ func (*Suite) TestReusableBeingUsedKey(c *check.C) {
n, err := h.CreateNamespace("test5")
c.Assert(err, check.IsNil)
pak, err := h.CreatePreAuthKey(n.Name, true, nil)
pak, err := h.CreatePreAuthKey(n.Name, true, false, nil)
c.Assert(err, check.IsNil)
db, err := h.db()
@ -130,10 +130,51 @@ func (*Suite) TestNotReusableNotBeingUsedKey(c *check.C) {
n, err := h.CreateNamespace("test6")
c.Assert(err, check.IsNil)
pak, err := h.CreatePreAuthKey(n.Name, false, nil)
pak, err := h.CreatePreAuthKey(n.Name, false, false, nil)
c.Assert(err, check.IsNil)
p, err := h.checkKeyValidity(pak.Key)
c.Assert(err, check.IsNil)
c.Assert(p.ID, check.Equals, pak.ID)
}
func (*Suite) TestEphemeralKey(c *check.C) {
n, err := h.CreateNamespace("test7")
c.Assert(err, check.IsNil)
pak, err := h.CreatePreAuthKey(n.Name, false, true, nil)
c.Assert(err, check.IsNil)
db, err := h.db()
if err != nil {
c.Fatal(err)
}
defer db.Close()
now := time.Now()
m := Machine{
ID: 0,
MachineKey: "foo",
NodeKey: "bar",
DiscoKey: "faa",
Name: "testest",
NamespaceID: n.ID,
Registered: true,
RegisterMethod: "authKey",
LastSeen: &now,
AuthKeyID: uint(pak.ID),
}
db.Save(&m)
_, err = h.checkKeyValidity(pak.Key)
// Ephemeral keys are by definition reusable
c.Assert(err, check.IsNil)
_, err = h.GetMachine("test7", "testest")
c.Assert(err, check.IsNil)
h.ExpireEphemeralNodes(0)
// The machine record should have been deleted
_, err = h.GetMachine("test7", "testest")
c.Assert(err, check.NotNil)
}

4
routes_test.go
View File

@ -9,13 +9,11 @@ import (
"tailscale.com/tailcfg"
)
var _ = check.Suite(&Suite{})
func (s *Suite) TestGetRoutes(c *check.C) {
n, err := h.CreateNamespace("test")
c.Assert(err, check.IsNil)
pak, err := h.CreatePreAuthKey(n.Name, false, nil)
pak, err := h.CreatePreAuthKey(n.Name, false, false, nil)
c.Assert(err, check.IsNil)
db, err := h.db()