mirror of
https://github.com/juanfont/headscale.git
synced 2024-11-29 18:33:05 +00:00
469551bc5d
This commit stores temporary registration data in cache, instead of memory allowing us to only have actually registered machines in the database.
627 lines
16 KiB
Go
627 lines
16 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>
|
|
<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 --key {{.Key}}</b>
|
|
</code>
|
|
</p>
|
|
|
|
</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
|
|
}
|
|
|
|
// 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{
|
|
Expiry: &time.Time{},
|
|
MachineKey: machineKeyStr,
|
|
Name: req.Hostinfo.Hostname,
|
|
NodeKey: NodePublicKeyStripPrefix(req.NodeKey),
|
|
LastSeen: &now,
|
|
}
|
|
|
|
h.registrationCache.Set(
|
|
machineKeyStr,
|
|
newMachine,
|
|
requestedExpiryCacheExpiration,
|
|
)
|
|
|
|
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))
|
|
}
|
|
|
|
if !registerRequest.Expiry.IsZero() {
|
|
log.Trace().
|
|
Caller().
|
|
Str("machine", registerRequest.Hostinfo.Hostname).
|
|
Time("expiry", registerRequest.Expiry).
|
|
Msg("Non-zero expiry time requested, adding to cache")
|
|
h.requestedExpiryCache.Set(
|
|
machineKey.String(),
|
|
registerRequest.Expiry,
|
|
requestedExpiryCacheExpiration,
|
|
)
|
|
}
|
|
|
|
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()
|
|
|
|
machine, err := h.RegisterMachine(
|
|
registerRequest.Hostinfo.Hostname,
|
|
machineKeyStr,
|
|
pak.Namespace.Name,
|
|
RegisterMethodAuthKey,
|
|
®isterRequest.Expiry,
|
|
pak,
|
|
&nodeKey,
|
|
&now,
|
|
)
|
|
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")
|
|
}
|