2020-06-21 10:32:08 +00:00
|
|
|
package headscale
|
|
|
|
|
|
|
|
|
|
import (
|
|
|
|
|
"encoding/binary"
|
|
|
|
|
"encoding/json"
|
|
|
|
|
"fmt"
|
|
|
|
|
"io"
|
|
|
|
|
"log"
|
|
|
|
|
"net/http"
|
|
|
|
|
"time"
|
|
|
|
|
|
|
|
|
|
"github.com/gin-gonic/gin"
|
|
|
|
|
"github.com/jinzhu/gorm"
|
|
|
|
|
"github.com/jinzhu/gorm/dialects/postgres"
|
|
|
|
|
"github.com/klauspost/compress/zstd"
|
2021-02-20 21:43:07 +00:00
|
|
|
"inet.af/netaddr"
|
2020-06-21 10:32:08 +00:00
|
|
|
"tailscale.com/tailcfg"
|
2021-02-20 21:43:07 +00:00
|
|
|
"tailscale.com/wgengine/wgcfg"
|
2020-06-21 10:32:08 +00:00
|
|
|
)
|
|
|
|
|
|
2021-02-27 23:58:09 +00:00
|
|
|
// KeyHandler provides the Headscale pub key
|
|
|
|
|
// Listens in /key
|
2020-06-21 10:32:08 +00:00
|
|
|
func (h *Headscale) KeyHandler(c *gin.Context) {
|
|
|
|
|
c.Data(200, "text/plain; charset=utf-8", []byte(h.publicKey.HexString()))
|
|
|
|
|
}
|
|
|
|
|
|
2021-02-27 23:58:09 +00:00
|
|
|
// RegisterWebAPI shows a simple message in the browser to point to the CLI
|
|
|
|
|
// Listens in /register
|
|
|
|
|
func (h *Headscale) RegisterWebAPI(c *gin.Context) {
|
|
|
|
|
mKeyStr := c.Query("key")
|
|
|
|
|
if mKeyStr == "" {
|
|
|
|
|
c.String(http.StatusBadRequest, "Wrong params")
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
c.Data(http.StatusOK, "text/html; charset=utf-8", []byte(fmt.Sprintf(`
|
|
|
|
|
<html>
|
|
|
|
|
<body>
|
|
|
|
|
<h1>headscale</h1>
|
|
|
|
|
<p>
|
|
|
|
|
Run the command below in the headscale server to add this machine to your network:
|
|
|
|
|
</p>
|
|
|
|
|
|
|
|
|
|
<p>
|
|
|
|
|
<code>
|
|
|
|
|
<b>headscale register %s</b>
|
|
|
|
|
</code>
|
|
|
|
|
</p>
|
|
|
|
|
|
|
|
|
|
</body>
|
|
|
|
|
</html>
|
|
|
|
|
|
|
|
|
|
`, mKeyStr)))
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// RegistrationHandler handles the actual registration process of a machine
|
|
|
|
|
// Endpoint /machine/:id
|
2020-06-21 10:32:08 +00:00
|
|
|
func (h *Headscale) RegistrationHandler(c *gin.Context) {
|
2021-02-21 22:54:15 +00:00
|
|
|
body, _ := io.ReadAll(c.Request.Body)
|
2020-06-21 10:32:08 +00:00
|
|
|
mKeyStr := c.Param("id")
|
|
|
|
|
mKey, err := wgcfg.ParseHexKey(mKeyStr)
|
|
|
|
|
if err != nil {
|
|
|
|
|
log.Printf("Cannot parse machine key: %s", err)
|
|
|
|
|
c.String(http.StatusInternalServerError, "Sad!")
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
req := tailcfg.RegisterRequest{}
|
|
|
|
|
err = decode(body, &req, &mKey, h.privateKey)
|
|
|
|
|
if err != nil {
|
|
|
|
|
log.Printf("Cannot decode message: %s", err)
|
|
|
|
|
c.String(http.StatusInternalServerError, "Very sad!")
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
db, err := h.db()
|
|
|
|
|
if err != nil {
|
|
|
|
|
log.Printf("Cannot open DB: %s", err)
|
|
|
|
|
c.String(http.StatusInternalServerError, ":(")
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
defer db.Close()
|
|
|
|
|
var m Machine
|
|
|
|
|
resp := tailcfg.RegisterResponse{}
|
|
|
|
|
|
|
|
|
|
if db.First(&m, "machine_key = ?", mKey.HexString()).RecordNotFound() {
|
|
|
|
|
log.Println("New Machine!")
|
|
|
|
|
h.handleNewServer(c, db, mKey, req)
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// We do have the updated key!
|
|
|
|
|
if m.NodeKey == wgcfg.Key(req.NodeKey).HexString() {
|
|
|
|
|
if m.Registered {
|
2021-02-23 20:07:52 +00:00
|
|
|
log.Println("Client is registered and we have the current key. All clear to /map")
|
2020-06-21 10:32:08 +00:00
|
|
|
resp.AuthURL = ""
|
2021-02-27 23:58:09 +00:00
|
|
|
resp.User = *m.Namespace.toUser()
|
2020-06-21 10:32:08 +00:00
|
|
|
respBody, err := encode(resp, &mKey, h.privateKey)
|
|
|
|
|
if err != nil {
|
|
|
|
|
log.Printf("Cannot encode message: %s", err)
|
|
|
|
|
c.String(http.StatusInternalServerError, "Extremely sad!")
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
c.Data(200, "application/json; charset=utf-8", respBody)
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
log.Println("Hey! Not registered. Not asking for key rotation. Send a passive-agressive authurl to register")
|
|
|
|
|
resp.AuthURL = fmt.Sprintf("%s/register?key=%s",
|
|
|
|
|
h.cfg.ServerURL, mKey.HexString())
|
|
|
|
|
respBody, err := encode(resp, &mKey, h.privateKey)
|
|
|
|
|
if err != nil {
|
|
|
|
|
log.Printf("Cannot encode message: %s", err)
|
|
|
|
|
c.String(http.StatusInternalServerError, "Extremely sad!")
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
c.Data(200, "application/json; charset=utf-8", respBody)
|
|
|
|
|
return
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// We dont have the updated key in the DB. Lets try with the old one.
|
|
|
|
|
if m.NodeKey == wgcfg.Key(req.OldNodeKey).HexString() {
|
|
|
|
|
log.Println("Key rotation!")
|
|
|
|
|
m.NodeKey = wgcfg.Key(req.NodeKey).HexString()
|
|
|
|
|
db.Save(&m)
|
|
|
|
|
resp.AuthURL = ""
|
2021-02-27 23:58:09 +00:00
|
|
|
resp.User = *m.Namespace.toUser()
|
2020-06-21 10:32:08 +00:00
|
|
|
respBody, err := encode(resp, &mKey, h.privateKey)
|
|
|
|
|
if err != nil {
|
|
|
|
|
log.Printf("Cannot encode message: %s", err)
|
|
|
|
|
c.String(http.StatusInternalServerError, "Extremely sad!")
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
c.Data(200, "application/json; charset=utf-8", respBody)
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
log.Println("We dont know anything about the new key. WTF")
|
|
|
|
|
}
|
|
|
|
|
|
2021-02-23 20:07:52 +00:00
|
|
|
// PollNetMapHandler takes care of /machine/:id/map
|
|
|
|
|
//
|
|
|
|
|
// This is the busiest endpoint, as it keeps the HTTP long poll that updates
|
|
|
|
|
// the clients when something in the network changes.
|
|
|
|
|
//
|
|
|
|
|
// The clients POST stuff like HostInfo and their Endpoints here, but
|
|
|
|
|
// only after their first request (marked with the ReadOnly field).
|
|
|
|
|
//
|
|
|
|
|
// At this moment the updates are sent in a quite horrendous way, but they kinda work.
|
2020-06-21 10:32:08 +00:00
|
|
|
func (h *Headscale) PollNetMapHandler(c *gin.Context) {
|
2021-02-21 22:54:15 +00:00
|
|
|
body, _ := io.ReadAll(c.Request.Body)
|
2020-06-21 10:32:08 +00:00
|
|
|
mKeyStr := c.Param("id")
|
|
|
|
|
mKey, err := wgcfg.ParseHexKey(mKeyStr)
|
|
|
|
|
if err != nil {
|
|
|
|
|
log.Printf("Cannot parse client key: %s", err)
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
req := tailcfg.MapRequest{}
|
|
|
|
|
err = decode(body, &req, &mKey, h.privateKey)
|
|
|
|
|
if err != nil {
|
|
|
|
|
log.Printf("Cannot decode message: %s", err)
|
2021-02-23 20:07:52 +00:00
|
|
|
return
|
2020-06-21 10:32:08 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
db, err := h.db()
|
|
|
|
|
if err != nil {
|
|
|
|
|
log.Printf("Cannot open DB: %s", err)
|
|
|
|
|
return
|
|
|
|
|
}
|
2021-02-21 22:54:15 +00:00
|
|
|
defer db.Close()
|
2020-06-21 10:32:08 +00:00
|
|
|
var m Machine
|
|
|
|
|
if db.First(&m, "machine_key = ?", mKey.HexString()).RecordNotFound() {
|
2021-02-23 20:07:52 +00:00
|
|
|
log.Printf("Cannot find machine: %s", err)
|
2020-06-21 10:32:08 +00:00
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
hostinfo, _ := json.Marshal(req.Hostinfo)
|
2021-02-23 20:07:52 +00:00
|
|
|
m.Name = req.Hostinfo.Hostname
|
2020-06-21 10:32:08 +00:00
|
|
|
m.HostInfo = postgres.Jsonb{RawMessage: json.RawMessage(hostinfo)}
|
2021-02-21 20:34:28 +00:00
|
|
|
m.DiscoKey = wgcfg.Key(req.DiscoKey).HexString()
|
2020-06-21 10:32:08 +00:00
|
|
|
now := time.Now().UTC()
|
2021-02-23 20:07:52 +00:00
|
|
|
|
|
|
|
|
// From Tailscale client:
|
|
|
|
|
//
|
|
|
|
|
// ReadOnly is whether the client just wants to fetch the MapResponse,
|
|
|
|
|
// without updating their Endpoints. The Endpoints field will be ignored and
|
|
|
|
|
// LastSeen will not be updated and peers will not be notified of changes.
|
|
|
|
|
//
|
|
|
|
|
// The intended use is for clients to discover the DERP map at start-up
|
|
|
|
|
// before their first real endpoint update.
|
|
|
|
|
if !req.ReadOnly {
|
|
|
|
|
endpoints, _ := json.Marshal(req.Endpoints)
|
|
|
|
|
m.Endpoints = postgres.Jsonb{RawMessage: json.RawMessage(endpoints)}
|
|
|
|
|
m.LastSeen = &now
|
|
|
|
|
}
|
2020-06-21 10:32:08 +00:00
|
|
|
db.Save(&m)
|
|
|
|
|
|
2021-02-23 20:07:52 +00:00
|
|
|
pollData := make(chan []byte, 1)
|
|
|
|
|
update := make(chan []byte, 1)
|
|
|
|
|
cancelKeepAlive := make(chan []byte, 1)
|
|
|
|
|
defer close(pollData)
|
|
|
|
|
defer close(update)
|
|
|
|
|
defer close(cancelKeepAlive)
|
|
|
|
|
h.pollMu.Lock()
|
|
|
|
|
h.clientsPolling[m.ID] = update
|
|
|
|
|
h.pollMu.Unlock()
|
2020-06-21 10:32:08 +00:00
|
|
|
|
2021-02-23 20:07:52 +00:00
|
|
|
data, err := h.getMapResponse(mKey, req, m)
|
|
|
|
|
if err != nil {
|
|
|
|
|
c.String(http.StatusInternalServerError, ":(")
|
|
|
|
|
return
|
|
|
|
|
}
|
2020-06-21 10:32:08 +00:00
|
|
|
|
2021-02-23 20:07:52 +00:00
|
|
|
log.Printf("[%s] sending initial map", m.Name)
|
|
|
|
|
pollData <- *data
|
2020-06-21 10:32:08 +00:00
|
|
|
|
2021-02-23 20:07:52 +00:00
|
|
|
// We update our peers if the client is not sending ReadOnly in the MapRequest
|
|
|
|
|
// so we don't distribute its initial request (it comes with
|
|
|
|
|
// empty endpoints to peers)
|
|
|
|
|
if !req.ReadOnly {
|
|
|
|
|
peers, _ := h.getPeers(m)
|
|
|
|
|
h.pollMu.Lock()
|
|
|
|
|
for _, p := range *peers {
|
|
|
|
|
log.Printf("[%s] notifying peer %s (%s)", m.Name, p.Name, p.Addresses[0])
|
|
|
|
|
if pUp, ok := h.clientsPolling[uint64(p.ID)]; ok {
|
|
|
|
|
pUp <- []byte{}
|
|
|
|
|
} else {
|
|
|
|
|
log.Printf("[%s] Peer %s does not appear to be polling", m.Name, p.Name)
|
2020-06-21 10:32:08 +00:00
|
|
|
}
|
|
|
|
|
}
|
2021-02-23 20:07:52 +00:00
|
|
|
h.pollMu.Unlock()
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
go h.keepAlive(cancelKeepAlive, pollData, mKey, req, m)
|
2020-06-21 10:32:08 +00:00
|
|
|
|
|
|
|
|
c.Stream(func(w io.Writer) bool {
|
2021-02-23 20:07:52 +00:00
|
|
|
select {
|
|
|
|
|
case data := <-pollData:
|
|
|
|
|
log.Printf("[%s] Sending data (%d bytes)", m.Name, len(data))
|
|
|
|
|
w.Write(data)
|
2020-06-21 10:32:08 +00:00
|
|
|
return true
|
2021-02-23 20:07:52 +00:00
|
|
|
|
|
|
|
|
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)
|
|
|
|
|
}
|
|
|
|
|
w.Write(*data)
|
|
|
|
|
return true
|
|
|
|
|
|
|
|
|
|
case <-c.Request.Context().Done():
|
|
|
|
|
log.Printf("[%s] 😥 The client has closed the connection", m.Name)
|
|
|
|
|
h.pollMu.Lock()
|
|
|
|
|
cancelKeepAlive <- []byte{}
|
|
|
|
|
delete(h.clientsPolling, m.ID)
|
|
|
|
|
h.pollMu.Unlock()
|
|
|
|
|
|
2020-06-21 10:32:08 +00:00
|
|
|
return false
|
2021-02-23 20:07:52 +00:00
|
|
|
|
2020-06-21 10:32:08 +00:00
|
|
|
}
|
|
|
|
|
})
|
2021-02-23 20:07:52 +00:00
|
|
|
}
|
2020-06-21 10:32:08 +00:00
|
|
|
|
2021-02-23 20:07:52 +00:00
|
|
|
func (h *Headscale) keepAlive(cancel chan []byte, pollData chan []byte, mKey wgcfg.Key, req tailcfg.MapRequest, m Machine) {
|
|
|
|
|
for {
|
|
|
|
|
select {
|
|
|
|
|
case <-cancel:
|
|
|
|
|
return
|
|
|
|
|
|
|
|
|
|
default:
|
|
|
|
|
data, err := h.getMapKeepAliveResponse(mKey, req, m)
|
|
|
|
|
if err != nil {
|
|
|
|
|
log.Printf("Error generating the keep alive msg: %s", err)
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
pollData <- *data
|
|
|
|
|
time.Sleep(60 * time.Second)
|
|
|
|
|
}
|
|
|
|
|
}
|
2020-06-21 10:32:08 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func (h *Headscale) getMapResponse(mKey wgcfg.Key, req tailcfg.MapRequest, m Machine) (*[]byte, error) {
|
|
|
|
|
node, err := m.toNode()
|
|
|
|
|
if err != nil {
|
|
|
|
|
log.Printf("Cannot convert to node: %s", err)
|
|
|
|
|
return nil, err
|
|
|
|
|
}
|
|
|
|
|
peers, err := h.getPeers(m)
|
|
|
|
|
if err != nil {
|
|
|
|
|
log.Printf("Cannot fetch peers: %s", err)
|
|
|
|
|
return nil, err
|
|
|
|
|
}
|
|
|
|
|
resp := tailcfg.MapResponse{
|
|
|
|
|
KeepAlive: false,
|
|
|
|
|
Node: node,
|
|
|
|
|
Peers: *peers,
|
2021-02-20 21:43:07 +00:00
|
|
|
DNS: []netaddr.IP{},
|
2020-06-21 10:32:08 +00:00
|
|
|
SearchPaths: []string{},
|
|
|
|
|
Domain: "foobar@example.com",
|
|
|
|
|
PacketFilter: tailcfg.FilterAllowAll,
|
2021-02-20 22:57:06 +00:00
|
|
|
DERPMap: h.cfg.DerpMap,
|
2020-06-21 10:32:08 +00:00
|
|
|
UserProfiles: []tailcfg.UserProfile{},
|
2021-02-23 23:31:58 +00:00
|
|
|
Roles: []tailcfg.Role{},
|
|
|
|
|
}
|
2020-06-21 10:32:08 +00:00
|
|
|
|
|
|
|
|
var respBody []byte
|
|
|
|
|
if req.Compress == "zstd" {
|
|
|
|
|
src, _ := json.Marshal(resp)
|
|
|
|
|
encoder, _ := zstd.NewWriter(nil)
|
|
|
|
|
srcCompressed := encoder.EncodeAll(src, nil)
|
|
|
|
|
respBody, err = encodeMsg(srcCompressed, &mKey, h.privateKey)
|
|
|
|
|
if err != nil {
|
|
|
|
|
return nil, err
|
|
|
|
|
}
|
|
|
|
|
} else {
|
|
|
|
|
respBody, err = encode(resp, &mKey, h.privateKey)
|
|
|
|
|
if err != nil {
|
|
|
|
|
return nil, err
|
|
|
|
|
}
|
|
|
|
|
}
|
2021-02-23 20:07:52 +00:00
|
|
|
// spew.Dump(resp)
|
2020-06-21 10:32:08 +00:00
|
|
|
// declare the incoming size on the first 4 bytes
|
|
|
|
|
data := make([]byte, 4)
|
|
|
|
|
binary.LittleEndian.PutUint32(data, uint32(len(respBody)))
|
|
|
|
|
data = append(data, respBody...)
|
|
|
|
|
return &data, nil
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func (h *Headscale) getMapKeepAliveResponse(mKey wgcfg.Key, req tailcfg.MapRequest, m Machine) (*[]byte, error) {
|
|
|
|
|
resp := tailcfg.MapResponse{
|
|
|
|
|
KeepAlive: true,
|
|
|
|
|
}
|
|
|
|
|
var respBody []byte
|
|
|
|
|
var err error
|
|
|
|
|
if req.Compress == "zstd" {
|
|
|
|
|
src, _ := json.Marshal(resp)
|
|
|
|
|
encoder, _ := zstd.NewWriter(nil)
|
|
|
|
|
srcCompressed := encoder.EncodeAll(src, nil)
|
|
|
|
|
respBody, err = encodeMsg(srcCompressed, &mKey, h.privateKey)
|
|
|
|
|
if err != nil {
|
|
|
|
|
return nil, err
|
|
|
|
|
}
|
|
|
|
|
} else {
|
|
|
|
|
respBody, err = encode(resp, &mKey, h.privateKey)
|
|
|
|
|
if err != nil {
|
|
|
|
|
return nil, err
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
data := make([]byte, 4)
|
|
|
|
|
binary.LittleEndian.PutUint32(data, uint32(len(respBody)))
|
|
|
|
|
data = append(data, respBody...)
|
|
|
|
|
return &data, nil
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func (h *Headscale) handleNewServer(c *gin.Context, db *gorm.DB, idKey wgcfg.Key, req tailcfg.RegisterRequest) {
|
|
|
|
|
mNew := Machine{
|
|
|
|
|
MachineKey: idKey.HexString(),
|
|
|
|
|
NodeKey: wgcfg.Key(req.NodeKey).HexString(),
|
|
|
|
|
Expiry: &req.Expiry,
|
2021-02-23 20:07:52 +00:00
|
|
|
Name: req.Hostinfo.Hostname,
|
2020-06-21 10:32:08 +00:00
|
|
|
}
|
|
|
|
|
if err := db.Create(&mNew).Error; err != nil {
|
|
|
|
|
log.Printf("Could not create row: %s", err)
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
resp := tailcfg.RegisterResponse{
|
|
|
|
|
AuthURL: fmt.Sprintf("%s/register?key=%s",
|
|
|
|
|
h.cfg.ServerURL, idKey.HexString()),
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
respBody, err := encode(resp, &idKey, h.privateKey)
|
|
|
|
|
if err != nil {
|
|
|
|
|
log.Printf("Cannot encode message: %s", err)
|
|
|
|
|
c.String(http.StatusInternalServerError, "Extremely sad!")
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
c.Data(200, "application/json; charset=utf-8", respBody)
|
|
|
|
|
}
|
