mirror of
https://github.com/juanfont/headscale.git
synced 2024-12-23 16:37:34 +00:00
Move common parts of the protocol to dedicated file
This commit is contained in:
Juan Font Alonso
parent
e640c6df05
commit
d0898ecabc
281
api.go
281
api.go
@ -4,19 +4,15 @@ import (
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"bytes"
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"encoding/binary"
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"encoding/json"
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"errors"
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"fmt"
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"html/template"
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"io"
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"net/http"
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"strconv"
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"strings"
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"time"
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"github.com/gorilla/mux"
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"github.com/klauspost/compress/zstd"
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"github.com/rs/zerolog/log"
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"gorm.io/gorm"
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"tailscale.com/tailcfg"
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"tailscale.com/types/key"
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)
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@ -77,62 +73,6 @@ func (h *Headscale) HealthHandler(
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respond(nil)
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}
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// KeyHandler provides the Headscale pub key
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// Listens in /key.
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func (h *Headscale) KeyHandler(
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writer http.ResponseWriter,
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req *http.Request,
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) {
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// New Tailscale clients send a 'v' parameter to indicate the CurrentCapabilityVersion
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clientCapabilityStr := req.URL.Query().Get("v")
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if clientCapabilityStr != "" {
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clientCapabilityVersion, err := strconv.Atoi(clientCapabilityStr)
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if err != nil {
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writer.Header().Set("Content-Type", "text/plain; charset=utf-8")
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writer.WriteHeader(http.StatusBadRequest)
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_, err := writer.Write([]byte("Wrong params"))
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if err != nil {
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log.Error().
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Caller().
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Err(err).
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Msg("Failed to write response")
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}
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return
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}
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if clientCapabilityVersion >= NoiseCapabilityVersion {
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// Tailscale has a different key for the TS2021 protocol
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resp := tailcfg.OverTLSPublicKeyResponse{
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LegacyPublicKey: h.privateKey.Public(),
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PublicKey: h.noisePrivateKey.Public(),
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}
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writer.Header().Set("Content-Type", "application/json")
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writer.WriteHeader(http.StatusOK)
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err = json.NewEncoder(writer).Encode(resp)
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if err != nil {
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log.Error().
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Caller().
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Err(err).
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Msg("Failed to write response")
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}
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return
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}
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}
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// Old clients don't send a 'v' parameter, so we send the legacy public key
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writer.Header().Set("Content-Type", "text/plain; charset=utf-8")
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writer.WriteHeader(http.StatusOK)
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_, err := writer.Write([]byte(MachinePublicKeyStripPrefix(h.privateKey.Public())))
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if err != nil {
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log.Error().
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Caller().
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Err(err).
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Msg("Failed to write response")
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}
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}
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type registerWebAPITemplateConfig struct {
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Key string
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}
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@ -211,191 +151,6 @@ func (h *Headscale) RegisterWebAPI(
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}
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}
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// RegistrationHandler handles the actual registration process of a machine
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// Endpoint /machine/:mkey.
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func (h *Headscale) RegistrationHandler(
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writer http.ResponseWriter,
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req *http.Request,
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) {
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vars := mux.Vars(req)
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machineKeyStr, ok := vars["mkey"]
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if !ok || machineKeyStr == "" {
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log.Error().
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Str("handler", "RegistrationHandler").
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Msg("No machine ID in request")
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http.Error(writer, "No machine ID in request", http.StatusBadRequest)
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return
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}
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body, _ := io.ReadAll(req.Body)
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var machineKey key.MachinePublic
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err := machineKey.UnmarshalText([]byte(MachinePublicKeyEnsurePrefix(machineKeyStr)))
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if err != nil {
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log.Error().
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Caller().
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Err(err).
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Msg("Cannot parse machine key")
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machineRegistrations.WithLabelValues("unknown", "web", "error", "unknown").Inc()
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http.Error(writer, "Cannot parse machine key", http.StatusBadRequest)
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return
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}
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registerRequest := tailcfg.RegisterRequest{}
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err = decode(body, ®isterRequest, &machineKey, h.privateKey)
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if err != nil {
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log.Error().
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Caller().
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Err(err).
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Msg("Cannot decode message")
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machineRegistrations.WithLabelValues("unknown", "web", "error", "unknown").Inc()
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http.Error(writer, "Cannot decode message", http.StatusBadRequest)
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return
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}
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now := time.Now().UTC()
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machine, err := h.GetMachineByMachineKey(machineKey)
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if errors.Is(err, gorm.ErrRecordNotFound) {
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machineKeyStr := MachinePublicKeyStripPrefix(machineKey)
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// If the machine has AuthKey set, handle registration via PreAuthKeys
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if registerRequest.Auth.AuthKey != "" {
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h.handleAuthKey(writer, req, machineKey, registerRequest)
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return
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}
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// Check if the node is waiting for interactive login.
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//
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// TODO(juan): We could use this field to improve our protocol implementation,
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// and hold the request until the client closes it, or the interactive
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// login is completed (i.e., the user registers the machine).
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// This is not implemented yet, as it is no strictly required. The only side-effect
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// is that the client will hammer headscale with requests until it gets a
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// successful RegisterResponse.
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if registerRequest.Followup != "" {
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if _, ok := h.registrationCache.Get(NodePublicKeyStripPrefix(registerRequest.NodeKey)); ok {
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log.Debug().
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Caller().
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Str("machine", registerRequest.Hostinfo.Hostname).
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Str("node_key", registerRequest.NodeKey.ShortString()).
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Str("node_key_old", registerRequest.OldNodeKey.ShortString()).
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Str("follow_up", registerRequest.Followup).
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Msg("Machine is waiting for interactive login")
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ticker := time.NewTicker(registrationHoldoff)
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select {
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case <-req.Context().Done():
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return
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case <-ticker.C:
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h.handleMachineRegistrationNew(writer, req, machineKey, registerRequest)
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return
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}
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}
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}
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log.Info().
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Caller().
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Str("machine", registerRequest.Hostinfo.Hostname).
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Str("node_key", registerRequest.NodeKey.ShortString()).
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Str("node_key_old", registerRequest.OldNodeKey.ShortString()).
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Str("follow_up", registerRequest.Followup).
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Msg("New machine not yet in the database")
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givenName, err := h.GenerateGivenName(registerRequest.Hostinfo.Hostname)
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if err != nil {
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log.Error().
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Caller().
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Str("func", "RegistrationHandler").
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Str("hostinfo.name", registerRequest.Hostinfo.Hostname).
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Err(err)
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return
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}
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// The machine did not have a key to authenticate, which means
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// that we rely on a method that calls back some how (OpenID or CLI)
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// We create the machine and then keep it around until a callback
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// happens
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newMachine := Machine{
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MachineKey: machineKeyStr,
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Hostname: registerRequest.Hostinfo.Hostname,
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GivenName: givenName,
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NodeKey: NodePublicKeyStripPrefix(registerRequest.NodeKey),
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LastSeen: &now,
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Expiry: &time.Time{},
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}
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if !registerRequest.Expiry.IsZero() {
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log.Trace().
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Caller().
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Str("machine", registerRequest.Hostinfo.Hostname).
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Time("expiry", registerRequest.Expiry).
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Msg("Non-zero expiry time requested")
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newMachine.Expiry = ®isterRequest.Expiry
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}
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h.registrationCache.Set(
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newMachine.NodeKey,
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newMachine,
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registerCacheExpiration,
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)
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h.handleMachineRegistrationNew(writer, req, machineKey, registerRequest)
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return
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}
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// The machine is already registered, so we need to pass through reauth or key update.
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if machine != nil {
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// If the NodeKey stored in headscale is the same as the key presented in a registration
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// request, then we have a node that is either:
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// - Trying to log out (sending a expiry in the past)
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// - A valid, registered machine, looking for the node map
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// - Expired machine wanting to reauthenticate
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if machine.NodeKey == NodePublicKeyStripPrefix(registerRequest.NodeKey) {
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// The client sends an Expiry in the past if the client is requesting to expire the key (aka logout)
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// https://github.com/tailscale/tailscale/blob/main/tailcfg/tailcfg.go#L648
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if !registerRequest.Expiry.IsZero() &&
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registerRequest.Expiry.UTC().Before(now) {
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h.handleMachineLogOut(writer, req, machineKey, *machine)
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return
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}
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// If machine is not expired, and is register, we have a already accepted this machine,
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// let it proceed with a valid registration
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if !machine.isExpired() {
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h.handleMachineValidRegistration(writer, req, machineKey, *machine)
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return
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}
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}
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// The NodeKey we have matches OldNodeKey, which means this is a refresh after a key expiration
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if machine.NodeKey == NodePublicKeyStripPrefix(registerRequest.OldNodeKey) &&
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!machine.isExpired() {
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h.handleMachineRefreshKey(
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writer,
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req,
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machineKey,
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registerRequest,
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*machine,
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)
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return
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}
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// The machine has expired
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h.handleMachineExpired(writer, req, machineKey, registerRequest, *machine)
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return
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}
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}
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func (h *Headscale) getLegacyMapResponseData(
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machineKey key.MachinePublic,
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mapRequest tailcfg.MapRequest,
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@ -436,42 +191,6 @@ func (h *Headscale) getLegacyMapResponseData(
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return data, nil
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}
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func (h *Headscale) getMapKeepAliveResponse(
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machineKey key.MachinePublic,
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mapRequest tailcfg.MapRequest,
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) ([]byte, error) {
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mapResponse := tailcfg.MapResponse{
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KeepAlive: true,
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}
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var respBody []byte
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var err error
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if mapRequest.Compress == ZstdCompression {
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src, err := json.Marshal(mapResponse)
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if err != nil {
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log.Error().
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Caller().
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Str("func", "getMapKeepAliveResponse").
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Err(err).
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Msg("Failed to marshal keepalive response for the client")
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return nil, err
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}
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encoder, _ := zstd.NewWriter(nil)
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srcCompressed := encoder.EncodeAll(src, nil)
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respBody = h.privateKey.SealTo(machineKey, srcCompressed)
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} else {
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respBody, err = encode(mapResponse, &machineKey, h.privateKey)
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if err != nil {
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return nil, err
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}
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}
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data := make([]byte, reservedResponseHeaderSize)
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binary.LittleEndian.PutUint32(data, uint32(len(respBody)))
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data = append(data, respBody...)
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return data, nil
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}
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func (h *Headscale) handleMachineLogOut(
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writer http.ResponseWriter,
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req *http.Request,
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66
protocol_common.go
Normal file
66
protocol_common.go
Normal file
@ -0,0 +1,66 @@
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package headscale
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import (
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"encoding/json"
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"net/http"
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"strconv"
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"github.com/rs/zerolog/log"
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"tailscale.com/tailcfg"
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)
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// KeyHandler provides the Headscale pub key
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// Listens in /key.
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func (h *Headscale) KeyHandler(
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writer http.ResponseWriter,
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req *http.Request,
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) {
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// New Tailscale clients send a 'v' parameter to indicate the CurrentCapabilityVersion
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clientCapabilityStr := req.URL.Query().Get("v")
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if clientCapabilityStr != "" {
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clientCapabilityVersion, err := strconv.Atoi(clientCapabilityStr)
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if err != nil {
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writer.Header().Set("Content-Type", "text/plain; charset=utf-8")
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writer.WriteHeader(http.StatusBadRequest)
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_, err := writer.Write([]byte("Wrong params"))
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if err != nil {
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log.Error().
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Caller().
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Err(err).
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Msg("Failed to write response")
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}
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return
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}
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if clientCapabilityVersion >= NoiseCapabilityVersion {
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// Tailscale has a different key for the TS2021 protocol
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resp := tailcfg.OverTLSPublicKeyResponse{
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LegacyPublicKey: h.privateKey.Public(),
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PublicKey: h.noisePrivateKey.Public(),
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}
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writer.Header().Set("Content-Type", "application/json")
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writer.WriteHeader(http.StatusOK)
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err = json.NewEncoder(writer).Encode(resp)
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if err != nil {
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log.Error().
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Caller().
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Err(err).
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Msg("Failed to write response")
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}
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return
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}
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}
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// Old clients don't send a 'v' parameter, so we send the legacy public key
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writer.Header().Set("Content-Type", "text/plain; charset=utf-8")
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writer.WriteHeader(http.StatusOK)
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_, err := writer.Write([]byte(MachinePublicKeyStripPrefix(h.privateKey.Public())))
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if err != nil {
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log.Error().
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Caller().
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Err(err).
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Msg("Failed to write response")
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}
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}
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47
protocol_common_utils.go
Normal file
47
protocol_common_utils.go
Normal file
@ -0,0 +1,47 @@
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package headscale
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import (
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"encoding/binary"
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"encoding/json"
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"github.com/klauspost/compress/zstd"
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"github.com/rs/zerolog/log"
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"tailscale.com/tailcfg"
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"tailscale.com/types/key"
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)
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func (h *Headscale) getMapKeepAliveResponse(
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machineKey key.MachinePublic,
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mapRequest tailcfg.MapRequest,
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) ([]byte, error) {
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mapResponse := tailcfg.MapResponse{
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KeepAlive: true,
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}
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var respBody []byte
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var err error
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if mapRequest.Compress == ZstdCompression {
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src, err := json.Marshal(mapResponse)
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if err != nil {
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log.Error().
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Caller().
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Str("func", "getMapKeepAliveResponse").
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Err(err).
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Msg("Failed to marshal keepalive response for the client")
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return nil, err
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}
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encoder, _ := zstd.NewWriter(nil)
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srcCompressed := encoder.EncodeAll(src, nil)
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respBody = h.privateKey.SealTo(machineKey, srcCompressed)
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} else {
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respBody, err = encode(mapResponse, &machineKey, h.privateKey)
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if err != nil {
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return nil, err
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}
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}
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data := make([]byte, reservedResponseHeaderSize)
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binary.LittleEndian.PutUint32(data, uint32(len(respBody)))
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data = append(data, respBody...)
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return data, nil
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}
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