388 lines
10 KiB
Go
388 lines
10 KiB
Go
package headscale
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"net/http"
|
|
"time"
|
|
|
|
"github.com/rs/zerolog/log"
|
|
|
|
"github.com/gin-gonic/gin"
|
|
"github.com/klauspost/compress/zstd"
|
|
"gorm.io/gorm"
|
|
"tailscale.com/tailcfg"
|
|
"tailscale.com/types/wgkey"
|
|
)
|
|
|
|
// KeyHandler provides the Headscale pub key
|
|
// Listens in /key
|
|
func (h *Headscale) KeyHandler(c *gin.Context) {
|
|
c.Data(200, "text/plain; charset=utf-8", []byte(h.publicKey.HexString()))
|
|
}
|
|
|
|
// 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
|
|
}
|
|
|
|
// spew.Dump(c.Params)
|
|
|
|
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 -n NAMESPACE nodes register %s</b>
|
|
</code>
|
|
</p>
|
|
|
|
</body>
|
|
</html>
|
|
|
|
`, mKeyStr)))
|
|
}
|
|
|
|
// RegistrationHandler handles the actual registration process of a machine
|
|
// Endpoint /machine/:id
|
|
func (h *Headscale) RegistrationHandler(c *gin.Context) {
|
|
body, _ := io.ReadAll(c.Request.Body)
|
|
mKeyStr := c.Param("id")
|
|
mKey, err := wgkey.ParseHex(mKeyStr)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "Registration").
|
|
Err(err).
|
|
Msg("Cannot parse machine key")
|
|
c.String(http.StatusInternalServerError, "Sad!")
|
|
return
|
|
}
|
|
req := tailcfg.RegisterRequest{}
|
|
err = decode(body, &req, &mKey, h.privateKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "Registration").
|
|
Err(err).
|
|
Msg("Cannot decode message")
|
|
c.String(http.StatusInternalServerError, "Very sad!")
|
|
return
|
|
}
|
|
|
|
now := time.Now().UTC()
|
|
var m Machine
|
|
if result := h.db.Preload("Namespace").First(&m, "machine_key = ?", mKey.HexString()); errors.Is(result.Error, gorm.ErrRecordNotFound) {
|
|
log.Info().Str("machine", req.Hostinfo.Hostname).Msg("New machine")
|
|
m = Machine{
|
|
Expiry: &req.Expiry,
|
|
MachineKey: mKey.HexString(),
|
|
Name: req.Hostinfo.Hostname,
|
|
NodeKey: wgkey.Key(req.NodeKey).HexString(),
|
|
LastSuccessfulUpdate: &now,
|
|
}
|
|
if err := h.db.Create(&m).Error; err != nil {
|
|
log.Error().
|
|
Str("handler", "Registration").
|
|
Err(err).
|
|
Msg("Could not create row")
|
|
return
|
|
}
|
|
}
|
|
|
|
if !m.Registered && req.Auth.AuthKey != "" {
|
|
h.handleAuthKey(c, h.db, mKey, req, m)
|
|
return
|
|
}
|
|
|
|
resp := tailcfg.RegisterResponse{}
|
|
|
|
// We have the updated key!
|
|
if m.NodeKey == wgkey.Key(req.NodeKey).HexString() {
|
|
if m.Registered {
|
|
log.Debug().
|
|
Str("handler", "Registration").
|
|
Str("machine", m.Name).
|
|
Msg("Client is registered and we have the current NodeKey. All clear to /map")
|
|
|
|
resp.AuthURL = ""
|
|
resp.MachineAuthorized = true
|
|
resp.User = *m.Namespace.toUser()
|
|
respBody, err := encode(resp, &mKey, h.privateKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "Registration").
|
|
Err(err).
|
|
Msg("Cannot encode message")
|
|
c.String(http.StatusInternalServerError, "")
|
|
return
|
|
}
|
|
c.Data(200, "application/json; charset=utf-8", respBody)
|
|
return
|
|
}
|
|
|
|
log.Debug().
|
|
Str("handler", "Registration").
|
|
Str("machine", m.Name).
|
|
Msg("Not registered and not NodeKey rotation. Sending a 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.Error().
|
|
Str("handler", "Registration").
|
|
Err(err).
|
|
Msg("Cannot encode message")
|
|
c.String(http.StatusInternalServerError, "")
|
|
return
|
|
}
|
|
c.Data(200, "application/json; charset=utf-8", respBody)
|
|
return
|
|
}
|
|
|
|
// The NodeKey we have matches OldNodeKey, which means this is a refresh after an key expiration
|
|
if m.NodeKey == wgkey.Key(req.OldNodeKey).HexString() {
|
|
log.Debug().
|
|
Str("handler", "Registration").
|
|
Str("machine", m.Name).
|
|
Msg("We have the OldNodeKey in the database. This is a key refresh")
|
|
m.NodeKey = wgkey.Key(req.NodeKey).HexString()
|
|
h.db.Save(&m)
|
|
|
|
resp.AuthURL = ""
|
|
resp.User = *m.Namespace.toUser()
|
|
respBody, err := encode(resp, &mKey, h.privateKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "Registration").
|
|
Err(err).
|
|
Msg("Cannot encode message")
|
|
c.String(http.StatusInternalServerError, "Extremely sad!")
|
|
return
|
|
}
|
|
c.Data(200, "application/json; charset=utf-8", respBody)
|
|
return
|
|
}
|
|
|
|
// We arrive here after a client is restarted without finalizing the authentication flow or
|
|
// when headscale is stopped in the middle of the auth process.
|
|
if m.Registered {
|
|
log.Debug().
|
|
Str("handler", "Registration").
|
|
Str("machine", m.Name).
|
|
Msg("The node is sending us a new NodeKey, but machine is registered. All clear for /map")
|
|
resp.AuthURL = ""
|
|
resp.MachineAuthorized = true
|
|
resp.User = *m.Namespace.toUser()
|
|
respBody, err := encode(resp, &mKey, h.privateKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "Registration").
|
|
Err(err).
|
|
Msg("Cannot encode message")
|
|
c.String(http.StatusInternalServerError, "")
|
|
return
|
|
}
|
|
c.Data(200, "application/json; charset=utf-8", respBody)
|
|
return
|
|
}
|
|
|
|
log.Debug().
|
|
Str("handler", "Registration").
|
|
Str("machine", m.Name).
|
|
Msg("The node is sending us a new NodeKey, sending auth url")
|
|
resp.AuthURL = fmt.Sprintf("%s/register?key=%s",
|
|
h.cfg.ServerURL, mKey.HexString())
|
|
respBody, err := encode(resp, &mKey, h.privateKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "Registration").
|
|
Err(err).
|
|
Msg("Cannot encode message")
|
|
c.String(http.StatusInternalServerError, "")
|
|
return
|
|
}
|
|
c.Data(200, "application/json; charset=utf-8", respBody)
|
|
}
|
|
|
|
func (h *Headscale) getMapResponse(mKey wgkey.Key, req tailcfg.MapRequest, m Machine) (*[]byte, error) {
|
|
log.Trace().
|
|
Str("func", "getMapResponse").
|
|
Str("machine", req.Hostinfo.Hostname).
|
|
Msg("Creating Map response")
|
|
node, err := m.toNode()
|
|
if err != nil {
|
|
log.Error().
|
|
Str("func", "getMapResponse").
|
|
Err(err).
|
|
Msg("Cannot convert to node")
|
|
return nil, err
|
|
}
|
|
peers, err := h.getPeers(m)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("func", "getMapResponse").
|
|
Err(err).
|
|
Msg("Cannot fetch peers")
|
|
return nil, err
|
|
}
|
|
|
|
profile := tailcfg.UserProfile{
|
|
ID: tailcfg.UserID(m.NamespaceID),
|
|
LoginName: m.Namespace.Name,
|
|
DisplayName: m.Namespace.Name,
|
|
}
|
|
|
|
resp := tailcfg.MapResponse{
|
|
KeepAlive: false,
|
|
Node: node,
|
|
Peers: *peers,
|
|
//TODO(kradalby): As per tailscale docs, if DNSConfig is nil,
|
|
// it means its not updated, maybe we can have some logic
|
|
// to check and only pass updates when its updates.
|
|
// This is probably more relevant if we try to implement
|
|
// "MagicDNS"
|
|
DNSConfig: h.cfg.DNSConfig,
|
|
SearchPaths: []string{},
|
|
Domain: "headscale.net",
|
|
PacketFilter: *h.aclRules,
|
|
DERPMap: h.cfg.DerpMap,
|
|
UserProfiles: []tailcfg.UserProfile{profile},
|
|
}
|
|
log.Trace().
|
|
Str("func", "getMapResponse").
|
|
Str("machine", req.Hostinfo.Hostname).
|
|
Msgf("Generated map response: %s", tailMapResponseToString(resp))
|
|
|
|
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
|
|
}
|
|
}
|
|
// spew.Dump(resp)
|
|
// 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 wgkey.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) handleAuthKey(c *gin.Context, db *gorm.DB, idKey wgkey.Key, req tailcfg.RegisterRequest, m Machine) {
|
|
log.Debug().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", req.Hostinfo.Hostname).
|
|
Msgf("Processing auth key for %s", req.Hostinfo.Hostname)
|
|
resp := tailcfg.RegisterResponse{}
|
|
pak, err := h.checkKeyValidity(req.Auth.AuthKey)
|
|
if err != nil {
|
|
resp.MachineAuthorized = false
|
|
respBody, err := encode(resp, &idKey, h.privateKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", m.Name).
|
|
Err(err).
|
|
Msg("Cannot encode message")
|
|
c.String(http.StatusInternalServerError, "")
|
|
return
|
|
}
|
|
c.Data(200, "application/json; charset=utf-8", respBody)
|
|
log.Error().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", m.Name).
|
|
Msg("Failed authentication via AuthKey")
|
|
return
|
|
}
|
|
|
|
log.Debug().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", m.Name).
|
|
Msg("Authentication key was valid, proceeding to acquire an IP address")
|
|
ip, err := h.getAvailableIP()
|
|
if err != nil {
|
|
log.Error().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", m.Name).
|
|
Msg("Failed to find an available IP")
|
|
return
|
|
}
|
|
log.Info().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", m.Name).
|
|
Str("ip", ip.String()).
|
|
Msgf("Assigning %s to %s", ip, m.Name)
|
|
|
|
m.AuthKeyID = uint(pak.ID)
|
|
m.IPAddress = ip.String()
|
|
m.NamespaceID = pak.NamespaceID
|
|
m.NodeKey = wgkey.Key(req.NodeKey).HexString() // we update it just in case
|
|
m.Registered = true
|
|
m.RegisterMethod = "authKey"
|
|
db.Save(&m)
|
|
|
|
resp.MachineAuthorized = true
|
|
resp.User = *pak.Namespace.toUser()
|
|
respBody, err := encode(resp, &idKey, h.privateKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", m.Name).
|
|
Err(err).
|
|
Msg("Cannot encode message")
|
|
c.String(http.StatusInternalServerError, "Extremely sad!")
|
|
return
|
|
}
|
|
c.Data(200, "application/json; charset=utf-8", respBody)
|
|
log.Info().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", m.Name).
|
|
Str("ip", ip.String()).
|
|
Msg("Successfully authenticated via AuthKey")
|
|
}
|