641 lines
17 KiB
Go
641 lines
17 KiB
Go
package headscale
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/binary"
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
"html/template"
|
|
"io"
|
|
"net/http"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/gin-gonic/gin"
|
|
"github.com/klauspost/compress/zstd"
|
|
"github.com/rs/zerolog/log"
|
|
"gorm.io/gorm"
|
|
"tailscale.com/tailcfg"
|
|
"tailscale.com/types/key"
|
|
)
|
|
|
|
const (
|
|
reservedResponseHeaderSize = 4
|
|
RegisterMethodAuthKey = "authkey"
|
|
RegisterMethodOIDC = "oidc"
|
|
RegisterMethodCLI = "cli"
|
|
ErrRegisterMethodCLIDoesNotSupportExpire = Error(
|
|
"machines registered with CLI does not support expire",
|
|
)
|
|
)
|
|
|
|
// KeyHandler provides the Headscale pub key
|
|
// Listens in /key.
|
|
func (h *Headscale) KeyHandler(ctx *gin.Context) {
|
|
ctx.Data(
|
|
http.StatusOK,
|
|
"text/plain; charset=utf-8",
|
|
[]byte(MachinePublicKeyStripPrefix(h.privateKey.Public())),
|
|
)
|
|
}
|
|
|
|
type registerWebAPITemplateConfig struct {
|
|
Key string
|
|
}
|
|
|
|
var registerWebAPITemplate = template.Must(
|
|
template.New("registerweb").Parse(`
|
|
<html>
|
|
<head>
|
|
<title>Registration - Headscale</title>
|
|
</head>
|
|
<body>
|
|
<h1>headscale</h1>
|
|
<h2>Machine registration</h2>
|
|
<p>
|
|
Run the command below in the headscale server to add this machine to your network:
|
|
</p>
|
|
<pre><code>headscale -n NAMESPACE nodes register --key {{.Key}}</code></pre>
|
|
</body>
|
|
</html>
|
|
`))
|
|
|
|
// RegisterWebAPI shows a simple message in the browser to point to the CLI
|
|
// Listens in /register.
|
|
func (h *Headscale) RegisterWebAPI(ctx *gin.Context) {
|
|
machineKeyStr := ctx.Query("key")
|
|
if machineKeyStr == "" {
|
|
ctx.String(http.StatusBadRequest, "Wrong params")
|
|
|
|
return
|
|
}
|
|
|
|
var content bytes.Buffer
|
|
if err := registerWebAPITemplate.Execute(&content, registerWebAPITemplateConfig{
|
|
Key: machineKeyStr,
|
|
}); err != nil {
|
|
log.Error().
|
|
Str("func", "RegisterWebAPI").
|
|
Err(err).
|
|
Msg("Could not render register web API template")
|
|
ctx.Data(
|
|
http.StatusInternalServerError,
|
|
"text/html; charset=utf-8",
|
|
[]byte("Could not render register web API template"),
|
|
)
|
|
}
|
|
|
|
ctx.Data(http.StatusOK, "text/html; charset=utf-8", content.Bytes())
|
|
}
|
|
|
|
// RegistrationHandler handles the actual registration process of a machine
|
|
// Endpoint /machine/:id.
|
|
func (h *Headscale) RegistrationHandler(ctx *gin.Context) {
|
|
body, _ := io.ReadAll(ctx.Request.Body)
|
|
machineKeyStr := ctx.Param("id")
|
|
|
|
var machineKey key.MachinePublic
|
|
err := machineKey.UnmarshalText([]byte(MachinePublicKeyEnsurePrefix(machineKeyStr)))
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Err(err).
|
|
Msg("Cannot parse machine key")
|
|
machineRegistrations.WithLabelValues("unknown", "web", "error", "unknown").Inc()
|
|
ctx.String(http.StatusInternalServerError, "Sad!")
|
|
|
|
return
|
|
}
|
|
req := tailcfg.RegisterRequest{}
|
|
err = decode(body, &req, &machineKey, h.privateKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Err(err).
|
|
Msg("Cannot decode message")
|
|
machineRegistrations.WithLabelValues("unknown", "web", "error", "unknown").Inc()
|
|
ctx.String(http.StatusInternalServerError, "Very sad!")
|
|
|
|
return
|
|
}
|
|
|
|
now := time.Now().UTC()
|
|
machine, err := h.GetMachineByMachineKey(machineKey)
|
|
if errors.Is(err, gorm.ErrRecordNotFound) {
|
|
log.Info().Str("machine", req.Hostinfo.Hostname).Msg("New machine")
|
|
|
|
machineKeyStr := MachinePublicKeyStripPrefix(machineKey)
|
|
|
|
// If the machine has AuthKey set, handle registration via PreAuthKeys
|
|
if req.Auth.AuthKey != "" {
|
|
h.handleAuthKey(ctx, machineKey, req)
|
|
|
|
return
|
|
}
|
|
hname, err := NormalizeToFQDNRules(
|
|
req.Hostinfo.Hostname,
|
|
h.cfg.OIDC.StripEmaildomain,
|
|
)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Str("func", "RegistrationHandler").
|
|
Str("hostinfo.name", req.Hostinfo.Hostname).
|
|
Err(err)
|
|
|
|
return
|
|
}
|
|
|
|
// The machine did not have a key to authenticate, which means
|
|
// that we rely on a method that calls back some how (OpenID or CLI)
|
|
// We create the machine and then keep it around until a callback
|
|
// happens
|
|
newMachine := Machine{
|
|
MachineKey: machineKeyStr,
|
|
Name: hname,
|
|
NodeKey: NodePublicKeyStripPrefix(req.NodeKey),
|
|
LastSeen: &now,
|
|
Expiry: &time.Time{},
|
|
}
|
|
|
|
if !req.Expiry.IsZero() {
|
|
log.Trace().
|
|
Caller().
|
|
Str("machine", req.Hostinfo.Hostname).
|
|
Time("expiry", req.Expiry).
|
|
Msg("Non-zero expiry time requested")
|
|
newMachine.Expiry = &req.Expiry
|
|
}
|
|
|
|
h.registrationCache.Set(
|
|
machineKeyStr,
|
|
newMachine,
|
|
registerCacheExpiration,
|
|
)
|
|
|
|
h.handleMachineRegistrationNew(ctx, machineKey, req)
|
|
|
|
return
|
|
}
|
|
|
|
// The machine is already registered, so we need to pass through reauth or key update.
|
|
if machine != nil {
|
|
// If the NodeKey stored in headscale is the same as the key presented in a registration
|
|
// request, then we have a node that is either:
|
|
// - Trying to log out (sending a expiry in the past)
|
|
// - A valid, registered machine, looking for the node map
|
|
// - Expired machine wanting to reauthenticate
|
|
if machine.NodeKey == NodePublicKeyStripPrefix(req.NodeKey) {
|
|
// The client sends an Expiry in the past if the client is requesting to expire the key (aka logout)
|
|
// https://github.com/tailscale/tailscale/blob/main/tailcfg/tailcfg.go#L648
|
|
if !req.Expiry.IsZero() && req.Expiry.UTC().Before(now) {
|
|
h.handleMachineLogOut(ctx, machineKey, *machine)
|
|
|
|
return
|
|
}
|
|
|
|
// If machine is not expired, and is register, we have a already accepted this machine,
|
|
// let it proceed with a valid registration
|
|
if !machine.isExpired() {
|
|
h.handleMachineValidRegistration(ctx, machineKey, *machine)
|
|
|
|
return
|
|
}
|
|
}
|
|
|
|
// The NodeKey we have matches OldNodeKey, which means this is a refresh after a key expiration
|
|
if machine.NodeKey == NodePublicKeyStripPrefix(req.OldNodeKey) &&
|
|
!machine.isExpired() {
|
|
h.handleMachineRefreshKey(ctx, machineKey, req, *machine)
|
|
|
|
return
|
|
}
|
|
|
|
// The machine has expired
|
|
h.handleMachineExpired(ctx, machineKey, req, *machine)
|
|
|
|
return
|
|
}
|
|
}
|
|
|
|
func (h *Headscale) getMapResponse(
|
|
machineKey key.MachinePublic,
|
|
req tailcfg.MapRequest,
|
|
machine *Machine,
|
|
) ([]byte, error) {
|
|
log.Trace().
|
|
Str("func", "getMapResponse").
|
|
Str("machine", req.Hostinfo.Hostname).
|
|
Msg("Creating Map response")
|
|
node, err := machine.toNode(h.cfg.BaseDomain, h.cfg.DNSConfig, true)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Str("func", "getMapResponse").
|
|
Err(err).
|
|
Msg("Cannot convert to node")
|
|
|
|
return nil, err
|
|
}
|
|
|
|
peers, err := h.getValidPeers(machine)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Str("func", "getMapResponse").
|
|
Err(err).
|
|
Msg("Cannot fetch peers")
|
|
|
|
return nil, err
|
|
}
|
|
|
|
profiles := getMapResponseUserProfiles(*machine, peers)
|
|
|
|
nodePeers, err := peers.toNodes(h.cfg.BaseDomain, h.cfg.DNSConfig, true)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Str("func", "getMapResponse").
|
|
Err(err).
|
|
Msg("Failed to convert peers to Tailscale nodes")
|
|
|
|
return nil, err
|
|
}
|
|
|
|
dnsConfig := getMapResponseDNSConfig(
|
|
h.cfg.DNSConfig,
|
|
h.cfg.BaseDomain,
|
|
*machine,
|
|
peers,
|
|
)
|
|
|
|
resp := tailcfg.MapResponse{
|
|
KeepAlive: false,
|
|
Node: node,
|
|
Peers: nodePeers,
|
|
DNSConfig: dnsConfig,
|
|
Domain: h.cfg.BaseDomain,
|
|
PacketFilter: h.aclRules,
|
|
DERPMap: h.DERPMap,
|
|
UserProfiles: profiles,
|
|
}
|
|
|
|
log.Trace().
|
|
Str("func", "getMapResponse").
|
|
Str("machine", req.Hostinfo.Hostname).
|
|
// Interface("payload", resp).
|
|
Msgf("Generated map response: %s", tailMapResponseToString(resp))
|
|
|
|
var respBody []byte
|
|
if req.Compress == "zstd" {
|
|
src, err := json.Marshal(resp)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Str("func", "getMapResponse").
|
|
Err(err).
|
|
Msg("Failed to marshal response for the client")
|
|
|
|
return nil, err
|
|
}
|
|
|
|
encoder, _ := zstd.NewWriter(nil)
|
|
srcCompressed := encoder.EncodeAll(src, nil)
|
|
respBody = h.privateKey.SealTo(machineKey, srcCompressed)
|
|
} else {
|
|
respBody, err = encode(resp, &machineKey, h.privateKey)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
// declare the incoming size on the first 4 bytes
|
|
data := make([]byte, reservedResponseHeaderSize)
|
|
binary.LittleEndian.PutUint32(data, uint32(len(respBody)))
|
|
data = append(data, respBody...)
|
|
|
|
return data, nil
|
|
}
|
|
|
|
func (h *Headscale) getMapKeepAliveResponse(
|
|
machineKey key.MachinePublic,
|
|
mapRequest tailcfg.MapRequest,
|
|
) ([]byte, error) {
|
|
mapResponse := tailcfg.MapResponse{
|
|
KeepAlive: true,
|
|
}
|
|
var respBody []byte
|
|
var err error
|
|
if mapRequest.Compress == "zstd" {
|
|
src, err := json.Marshal(mapResponse)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Str("func", "getMapKeepAliveResponse").
|
|
Err(err).
|
|
Msg("Failed to marshal keepalive response for the client")
|
|
|
|
return nil, err
|
|
}
|
|
encoder, _ := zstd.NewWriter(nil)
|
|
srcCompressed := encoder.EncodeAll(src, nil)
|
|
respBody = h.privateKey.SealTo(machineKey, srcCompressed)
|
|
} else {
|
|
respBody, err = encode(mapResponse, &machineKey, h.privateKey)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
data := make([]byte, reservedResponseHeaderSize)
|
|
binary.LittleEndian.PutUint32(data, uint32(len(respBody)))
|
|
data = append(data, respBody...)
|
|
|
|
return data, nil
|
|
}
|
|
|
|
func (h *Headscale) handleMachineLogOut(
|
|
ctx *gin.Context,
|
|
machineKey key.MachinePublic,
|
|
machine Machine,
|
|
) {
|
|
resp := tailcfg.RegisterResponse{}
|
|
|
|
log.Info().
|
|
Str("machine", machine.Name).
|
|
Msg("Client requested logout")
|
|
|
|
h.ExpireMachine(&machine)
|
|
|
|
resp.AuthURL = ""
|
|
resp.MachineAuthorized = false
|
|
resp.User = *machine.Namespace.toUser()
|
|
respBody, err := encode(resp, &machineKey, h.privateKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Err(err).
|
|
Msg("Cannot encode message")
|
|
ctx.String(http.StatusInternalServerError, "")
|
|
|
|
return
|
|
}
|
|
ctx.Data(http.StatusOK, "application/json; charset=utf-8", respBody)
|
|
}
|
|
|
|
func (h *Headscale) handleMachineValidRegistration(
|
|
ctx *gin.Context,
|
|
machineKey key.MachinePublic,
|
|
machine Machine,
|
|
) {
|
|
resp := tailcfg.RegisterResponse{}
|
|
|
|
// The machine registration is valid, respond with redirect to /map
|
|
log.Debug().
|
|
Str("machine", machine.Name).
|
|
Msg("Client is registered and we have the current NodeKey. All clear to /map")
|
|
|
|
resp.AuthURL = ""
|
|
resp.MachineAuthorized = true
|
|
resp.User = *machine.Namespace.toUser()
|
|
resp.Login = *machine.Namespace.toLogin()
|
|
|
|
respBody, err := encode(resp, &machineKey, h.privateKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Err(err).
|
|
Msg("Cannot encode message")
|
|
machineRegistrations.WithLabelValues("update", "web", "error", machine.Namespace.Name).
|
|
Inc()
|
|
ctx.String(http.StatusInternalServerError, "")
|
|
|
|
return
|
|
}
|
|
machineRegistrations.WithLabelValues("update", "web", "success", machine.Namespace.Name).
|
|
Inc()
|
|
ctx.Data(http.StatusOK, "application/json; charset=utf-8", respBody)
|
|
}
|
|
|
|
func (h *Headscale) handleMachineExpired(
|
|
ctx *gin.Context,
|
|
machineKey key.MachinePublic,
|
|
registerRequest tailcfg.RegisterRequest,
|
|
machine Machine,
|
|
) {
|
|
resp := tailcfg.RegisterResponse{}
|
|
|
|
// The client has registered before, but has expired
|
|
log.Debug().
|
|
Str("machine", machine.Name).
|
|
Msg("Machine registration has expired. Sending a authurl to register")
|
|
|
|
if registerRequest.Auth.AuthKey != "" {
|
|
h.handleAuthKey(ctx, machineKey, registerRequest)
|
|
|
|
return
|
|
}
|
|
|
|
if h.cfg.OIDC.Issuer != "" {
|
|
resp.AuthURL = fmt.Sprintf("%s/oidc/register/%s",
|
|
strings.TrimSuffix(h.cfg.ServerURL, "/"), machineKey.String())
|
|
} else {
|
|
resp.AuthURL = fmt.Sprintf("%s/register?key=%s",
|
|
strings.TrimSuffix(h.cfg.ServerURL, "/"), machineKey.String())
|
|
}
|
|
|
|
respBody, err := encode(resp, &machineKey, h.privateKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Err(err).
|
|
Msg("Cannot encode message")
|
|
machineRegistrations.WithLabelValues("reauth", "web", "error", machine.Namespace.Name).
|
|
Inc()
|
|
ctx.String(http.StatusInternalServerError, "")
|
|
|
|
return
|
|
}
|
|
machineRegistrations.WithLabelValues("reauth", "web", "success", machine.Namespace.Name).
|
|
Inc()
|
|
ctx.Data(http.StatusOK, "application/json; charset=utf-8", respBody)
|
|
}
|
|
|
|
func (h *Headscale) handleMachineRefreshKey(
|
|
ctx *gin.Context,
|
|
machineKey key.MachinePublic,
|
|
registerRequest tailcfg.RegisterRequest,
|
|
machine Machine,
|
|
) {
|
|
resp := tailcfg.RegisterResponse{}
|
|
|
|
log.Debug().
|
|
Str("machine", machine.Name).
|
|
Msg("We have the OldNodeKey in the database. This is a key refresh")
|
|
machine.NodeKey = NodePublicKeyStripPrefix(registerRequest.NodeKey)
|
|
h.db.Save(&machine)
|
|
|
|
resp.AuthURL = ""
|
|
resp.User = *machine.Namespace.toUser()
|
|
respBody, err := encode(resp, &machineKey, h.privateKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Err(err).
|
|
Msg("Cannot encode message")
|
|
ctx.String(http.StatusInternalServerError, "Extremely sad!")
|
|
|
|
return
|
|
}
|
|
ctx.Data(http.StatusOK, "application/json; charset=utf-8", respBody)
|
|
}
|
|
|
|
func (h *Headscale) handleMachineRegistrationNew(
|
|
ctx *gin.Context,
|
|
machineKey key.MachinePublic,
|
|
registerRequest tailcfg.RegisterRequest,
|
|
) {
|
|
resp := tailcfg.RegisterResponse{}
|
|
|
|
// The machine registration is new, redirect the client to the registration URL
|
|
log.Debug().
|
|
Str("machine", registerRequest.Hostinfo.Hostname).
|
|
Msg("The node is sending us a new NodeKey, sending auth url")
|
|
if h.cfg.OIDC.Issuer != "" {
|
|
resp.AuthURL = fmt.Sprintf(
|
|
"%s/oidc/register/%s",
|
|
strings.TrimSuffix(h.cfg.ServerURL, "/"),
|
|
machineKey.String(),
|
|
)
|
|
} else {
|
|
resp.AuthURL = fmt.Sprintf("%s/register?key=%s",
|
|
strings.TrimSuffix(h.cfg.ServerURL, "/"), MachinePublicKeyStripPrefix(machineKey))
|
|
}
|
|
|
|
respBody, err := encode(resp, &machineKey, h.privateKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Err(err).
|
|
Msg("Cannot encode message")
|
|
ctx.String(http.StatusInternalServerError, "")
|
|
|
|
return
|
|
}
|
|
ctx.Data(http.StatusOK, "application/json; charset=utf-8", respBody)
|
|
}
|
|
|
|
// TODO: check if any locks are needed around IP allocation.
|
|
func (h *Headscale) handleAuthKey(
|
|
ctx *gin.Context,
|
|
machineKey key.MachinePublic,
|
|
registerRequest tailcfg.RegisterRequest,
|
|
) {
|
|
machineKeyStr := MachinePublicKeyStripPrefix(machineKey)
|
|
|
|
log.Debug().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", registerRequest.Hostinfo.Hostname).
|
|
Msgf("Processing auth key for %s", registerRequest.Hostinfo.Hostname)
|
|
resp := tailcfg.RegisterResponse{}
|
|
|
|
pak, err := h.checkKeyValidity(registerRequest.Auth.AuthKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", registerRequest.Hostinfo.Hostname).
|
|
Err(err).
|
|
Msg("Failed authentication via AuthKey")
|
|
resp.MachineAuthorized = false
|
|
respBody, err := encode(resp, &machineKey, h.privateKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", registerRequest.Hostinfo.Hostname).
|
|
Err(err).
|
|
Msg("Cannot encode message")
|
|
ctx.String(http.StatusInternalServerError, "")
|
|
machineRegistrations.WithLabelValues("new", RegisterMethodAuthKey, "error", pak.Namespace.Name).
|
|
Inc()
|
|
|
|
return
|
|
}
|
|
|
|
ctx.Data(http.StatusUnauthorized, "application/json; charset=utf-8", respBody)
|
|
log.Error().
|
|
Caller().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", registerRequest.Hostinfo.Hostname).
|
|
Msg("Failed authentication via AuthKey")
|
|
machineRegistrations.WithLabelValues("new", RegisterMethodAuthKey, "error", pak.Namespace.Name).
|
|
Inc()
|
|
|
|
return
|
|
}
|
|
|
|
log.Debug().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", registerRequest.Hostinfo.Hostname).
|
|
Msg("Authentication key was valid, proceeding to acquire IP addresses")
|
|
|
|
nodeKey := NodePublicKeyStripPrefix(registerRequest.NodeKey)
|
|
now := time.Now().UTC()
|
|
|
|
machineToRegister := Machine{
|
|
Name: registerRequest.Hostinfo.Hostname,
|
|
NamespaceID: pak.Namespace.ID,
|
|
MachineKey: machineKeyStr,
|
|
RegisterMethod: RegisterMethodAuthKey,
|
|
Expiry: ®isterRequest.Expiry,
|
|
NodeKey: nodeKey,
|
|
LastSeen: &now,
|
|
AuthKeyID: uint(pak.ID),
|
|
}
|
|
|
|
machine, err := h.RegisterMachine(
|
|
machineToRegister,
|
|
)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Err(err).
|
|
Msg("could not register machine")
|
|
machineRegistrations.WithLabelValues("new", RegisterMethodAuthKey, "error", pak.Namespace.Name).
|
|
Inc()
|
|
ctx.String(
|
|
http.StatusInternalServerError,
|
|
"could not register machine",
|
|
)
|
|
|
|
return
|
|
}
|
|
|
|
h.UsePreAuthKey(pak)
|
|
|
|
resp.MachineAuthorized = true
|
|
resp.User = *pak.Namespace.toUser()
|
|
respBody, err := encode(resp, &machineKey, h.privateKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", registerRequest.Hostinfo.Hostname).
|
|
Err(err).
|
|
Msg("Cannot encode message")
|
|
machineRegistrations.WithLabelValues("new", RegisterMethodAuthKey, "error", pak.Namespace.Name).
|
|
Inc()
|
|
ctx.String(http.StatusInternalServerError, "Extremely sad!")
|
|
|
|
return
|
|
}
|
|
machineRegistrations.WithLabelValues("new", RegisterMethodAuthKey, "success", pak.Namespace.Name).
|
|
Inc()
|
|
ctx.Data(http.StatusOK, "application/json; charset=utf-8", respBody)
|
|
log.Info().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", registerRequest.Hostinfo.Hostname).
|
|
Str("ips", strings.Join(machine.IPAddresses.ToStringSlice(), ", ")).
|
|
Msg("Successfully authenticated via AuthKey")
|
|
}
|