mirror of
https://github.com/juanfont/headscale.git
synced 2024-11-27 12:05:26 +00:00
Add registration handler over Noise protocol
This commit is contained in:
Juan Font Alonso
parent
fdd0c50402
commit
1880035f6f
2
app.go
2
app.go
@ -466,7 +466,7 @@ func (h *Headscale) createRouter(grpcMux *runtime.ServeMux) *mux.Router {
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func (h *Headscale) createNoiseMux() *mux.Router {
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router := mux.NewRouter()
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//router.HandleFunc("/machine/register", h.NoiseRegistrationHandler).Methods(http.MethodPost)
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router.HandleFunc("/machine/register", h.NoiseRegistrationHandler).Methods(http.MethodPost)
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//router.HandleFunc("/machine/map", h.NoisePollNetMapHandler).Methods(http.MethodPost)
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return router
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427
noise_api.go
Normal file
427
noise_api.go
Normal file
@ -0,0 +1,427 @@
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package headscale
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"net/http"
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"strings"
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"time"
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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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)
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// // NoiseRegistrationHandler handles the actual registration process of a machine
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func (h *Headscale) NoiseRegistrationHandler(
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writer http.ResponseWriter,
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req *http.Request,
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) {
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log.Trace().Caller().Msgf("Noise registration handler for client %s", req.RemoteAddr)
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if req.Method != http.MethodPost {
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http.Error(writer, "Wrong method", http.StatusMethodNotAllowed)
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return
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}
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body, _ := io.ReadAll(req.Body)
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registerRequest := tailcfg.RegisterRequest{}
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if err := json.Unmarshal(body, ®isterRequest); 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 RegisterRequest")
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machineRegistrations.WithLabelValues("unknown", "web", "error", "unknown").Inc()
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http.Error(writer, "Internal error", http.StatusInternalServerError)
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return
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}
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log.Trace().Caller().
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Str("node_key", registerRequest.NodeKey.ShortString()).
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Str("old_node_key", registerRequest.OldNodeKey.ShortString()).
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Msg("New node is registering")
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now := time.Now().UTC()
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machine, err := h.GetMachineByAnyNodeKey(registerRequest.NodeKey, registerRequest.OldNodeKey)
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if errors.Is(err, gorm.ErrRecordNotFound) {
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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.handleNoiseAuthKey(writer, req, 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.handleNoiseMachineRegistrationNew(writer, req, 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 Noise 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: "",
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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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NodePublicKeyStripPrefix(registerRequest.NodeKey),
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newMachine,
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registerCacheExpiration,
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)
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h.handleNoiseMachineRegistrationNew(writer, req, 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() && registerRequest.Expiry.UTC().Before(now) {
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h.handleNoiseNodeLogOut(writer, req, *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.handleNoiseNodeValidRegistration(writer, req, *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.handleNoiseNodeRefreshKey(writer, req, registerRequest, *machine)
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return
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}
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// The node has expired
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h.handleNoiseNodeExpired(writer, req, registerRequest, *machine)
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return
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}
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}
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func (h *Headscale) handleNoiseAuthKey(
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w http.ResponseWriter,
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r *http.Request,
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registerRequest tailcfg.RegisterRequest,
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) {
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log.Debug().
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Caller().
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Str("machine", registerRequest.Hostinfo.Hostname).
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Msgf("Processing auth key for %s over Noise", registerRequest.Hostinfo.Hostname)
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resp := tailcfg.RegisterResponse{}
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pak, err := h.checkKeyValidity(registerRequest.Auth.AuthKey)
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if err != nil {
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log.Error().
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Caller().
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Str("machine", registerRequest.Hostinfo.Hostname).
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Err(err).
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Msg("Failed authentication via AuthKey")
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resp.MachineAuthorized = false
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusUnauthorized)
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json.NewEncoder(w).Encode(resp)
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log.Error().
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Caller().
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Str("machine", registerRequest.Hostinfo.Hostname).
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Msg("Failed authentication via AuthKey over Noise")
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if pak != nil {
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machineRegistrations.WithLabelValues("new", RegisterMethodAuthKey, "error", pak.Namespace.Name).
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Inc()
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} else {
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machineRegistrations.WithLabelValues("new", RegisterMethodAuthKey, "error", "unknown").Inc()
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}
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return
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}
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log.Debug().
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Caller().
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Str("machine", registerRequest.Hostinfo.Hostname).
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Msg("Authentication key was valid, proceeding to acquire IP addresses")
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nodeKey := NodePublicKeyStripPrefix(registerRequest.NodeKey)
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// retrieve machine information if it exist
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// The error is not important, because if it does not
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// exist, then this is a new machine and we will move
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// on to registration.
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machine, _ := h.GetMachineByAnyNodeKey(registerRequest.NodeKey, registerRequest.OldNodeKey)
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if machine != nil {
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log.Trace().
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Caller().
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Str("machine", machine.Hostname).
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Msg("machine already registered, refreshing with new auth key")
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machine.NodeKey = nodeKey
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machine.AuthKeyID = uint(pak.ID)
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h.RefreshMachine(machine, registerRequest.Expiry)
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} else {
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now := time.Now().UTC()
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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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machineToRegister := Machine{
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Hostname: registerRequest.Hostinfo.Hostname,
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GivenName: givenName,
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NamespaceID: pak.Namespace.ID,
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MachineKey: "",
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RegisterMethod: RegisterMethodAuthKey,
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Expiry: ®isterRequest.Expiry,
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NodeKey: nodeKey,
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LastSeen: &now,
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AuthKeyID: uint(pak.ID),
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}
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machine, err = h.RegisterMachine(
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machineToRegister,
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)
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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("could not register machine")
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machineRegistrations.WithLabelValues("new", RegisterMethodAuthKey, "error", pak.Namespace.Name).
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Inc()
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http.Error(w, "Internal error", http.StatusInternalServerError)
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return
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}
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}
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h.UsePreAuthKey(pak)
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resp.MachineAuthorized = true
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resp.User = *pak.Namespace.toUser()
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machineRegistrations.WithLabelValues("new", RegisterMethodAuthKey, "success", pak.Namespace.Name).
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Inc()
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusOK)
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json.NewEncoder(w).Encode(resp)
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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("ips", strings.Join(machine.IPAddresses.ToStringSlice(), ", ")).
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Msg("Successfully authenticated via AuthKey on Noise")
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}
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func (h *Headscale) handleNoiseNodeValidRegistration(
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w http.ResponseWriter,
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r *http.Request,
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machine Machine,
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) {
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resp := tailcfg.RegisterResponse{}
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// The machine registration is valid, respond with redirect to /map
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log.Debug().
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Str("machine", machine.Hostname).
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Msg("Client is registered and we have the current NodeKey. All clear to /map")
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resp.AuthURL = ""
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resp.MachineAuthorized = true
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resp.User = *machine.Namespace.toUser()
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resp.Login = *machine.Namespace.toLogin()
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machineRegistrations.WithLabelValues("update", "web", "success", machine.Namespace.Name).
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Inc()
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusOK)
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json.NewEncoder(w).Encode(resp)
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}
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func (h *Headscale) handleNoiseMachineRegistrationNew(
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w http.ResponseWriter,
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r *http.Request,
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registerRequest tailcfg.RegisterRequest,
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) {
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resp := tailcfg.RegisterResponse{}
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// The machine registration is new, redirect the client to the registration URL
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log.Debug().
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Str("machine", registerRequest.Hostinfo.Hostname).
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Msg("The node is sending us a new NodeKey, sending auth url")
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if h.cfg.OIDC.Issuer != "" {
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resp.AuthURL = fmt.Sprintf(
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"%s/oidc/register/%s",
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strings.TrimSuffix(h.cfg.ServerURL, "/"),
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NodePublicKeyStripPrefix(registerRequest.NodeKey),
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)
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} else {
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resp.AuthURL = fmt.Sprintf("%s/register?key=%s",
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strings.TrimSuffix(h.cfg.ServerURL, "/"), NodePublicKeyStripPrefix(registerRequest.NodeKey))
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}
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusOK)
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json.NewEncoder(w).Encode(resp)
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}
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func (h *Headscale) handleNoiseNodeLogOut(
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w http.ResponseWriter,
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r *http.Request,
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machine Machine,
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) {
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resp := tailcfg.RegisterResponse{}
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log.Info().
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Str("machine", machine.Hostname).
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Msg("Client requested logout")
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h.ExpireMachine(&machine)
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resp.AuthURL = ""
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resp.MachineAuthorized = false
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resp.User = *machine.Namespace.toUser()
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusOK)
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json.NewEncoder(w).Encode(resp)
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}
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func (h *Headscale) handleNoiseNodeRefreshKey(
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w http.ResponseWriter,
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r *http.Request,
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registerRequest tailcfg.RegisterRequest,
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machine Machine,
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) {
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resp := tailcfg.RegisterResponse{}
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log.Debug().
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Str("machine", machine.Hostname).
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Msg("We have the OldNodeKey in the database. This is a key refresh")
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machine.NodeKey = NodePublicKeyStripPrefix(registerRequest.NodeKey)
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h.db.Save(&machine)
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resp.AuthURL = ""
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resp.User = *machine.Namespace.toUser()
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusOK)
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json.NewEncoder(w).Encode(resp)
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}
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func (h *Headscale) handleNoiseNodeExpired(
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w http.ResponseWriter,
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r *http.Request,
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registerRequest tailcfg.RegisterRequest,
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machine Machine,
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) {
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resp := tailcfg.RegisterResponse{}
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// The client has registered before, but has expired
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log.Debug().
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Caller().
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Str("machine", machine.Hostname).
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Msg("Machine registration has expired. Sending a authurl to register")
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if registerRequest.Auth.AuthKey != "" {
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h.handleNoiseAuthKey(w, r, registerRequest)
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return
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}
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if h.cfg.OIDC.Issuer != "" {
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resp.AuthURL = fmt.Sprintf("%s/oidc/register/%s",
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strings.TrimSuffix(h.cfg.ServerURL, "/"), machine.NodeKey)
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} else {
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resp.AuthURL = fmt.Sprintf("%s/register?key=%s",
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strings.TrimSuffix(h.cfg.ServerURL, "/"), machine.NodeKey)
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}
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machineRegistrations.WithLabelValues("reauth", "web", "success", machine.Namespace.Name).
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Inc()
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusOK)
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json.NewEncoder(w).Encode(resp)
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}
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