243 lines
6.0 KiB
Go
243 lines
6.0 KiB
Go
package hscontrol
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import (
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"bytes"
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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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"net/http"
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"strconv"
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"time"
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"github.com/gorilla/mux"
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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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const (
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// The CapabilityVersion is used by Tailscale clients to indicate
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// their codebase version. Tailscale clients can communicate over TS2021
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// from CapabilityVersion 28, but we only have good support for it
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// since https://github.com/tailscale/tailscale/pull/4323 (Noise in any HTTPS port).
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//
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// Related to this change, there is https://github.com/tailscale/tailscale/pull/5379,
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// where CapabilityVersion 39 is introduced to indicate #4323 was merged.
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//
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// See also https://github.com/tailscale/tailscale/blob/main/tailcfg/tailcfg.go
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NoiseCapabilityVersion = 39
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// TODO(juan): remove this once https://github.com/juanfont/headscale/issues/727 is fixed.
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registrationHoldoff = time.Second * 5
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reservedResponseHeaderSize = 4
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)
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var ErrRegisterMethodCLIDoesNotSupportExpire = errors.New(
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"machines registered with CLI does not support expire",
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)
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var ErrNoCapabilityVersion = errors.New("no capability version set")
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func parseCabailityVersion(req *http.Request) (tailcfg.CapabilityVersion, error) {
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clientCapabilityStr := req.URL.Query().Get("v")
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if clientCapabilityStr == "" {
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return 0, ErrNoCapabilityVersion
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}
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clientCapabilityVersion, err := strconv.Atoi(clientCapabilityStr)
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if err != nil {
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return 0, fmt.Errorf("failed to parse capability version: %w", err)
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}
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return tailcfg.CapabilityVersion(clientCapabilityVersion), 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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capVer, err := parseCabailityVersion(req)
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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 get capability version")
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writer.Header().Set("Content-Type", "text/plain; charset=utf-8")
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writer.WriteHeader(http.StatusInternalServerError)
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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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log.Debug().
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Str("handler", "/key").
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Int("cap_ver", int(capVer)).
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Msg("New noise client")
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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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// TS2021 (Tailscale v2 protocol) requires to have a different key
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if capVer >= NoiseCapabilityVersion {
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resp := tailcfg.OverTLSPublicKeyResponse{
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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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func (h *Headscale) HealthHandler(
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writer http.ResponseWriter,
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req *http.Request,
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) {
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respond := func(err error) {
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writer.Header().Set("Content-Type", "application/health+json; charset=utf-8")
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res := struct {
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Status string `json:"status"`
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}{
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Status: "pass",
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}
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if err != nil {
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writer.WriteHeader(http.StatusInternalServerError)
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log.Error().Caller().Err(err).Msg("health check failed")
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res.Status = "fail"
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}
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buf, err := json.Marshal(res)
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if err != nil {
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log.Error().Caller().Err(err).Msg("marshal failed")
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}
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_, err = writer.Write(buf)
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if err != nil {
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log.Error().Caller().Err(err).Msg("write failed")
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}
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}
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if err := h.db.PingDB(req.Context()); err != nil {
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respond(err)
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return
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}
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respond(nil)
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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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var registerWebAPITemplate = template.Must(
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template.New("registerweb").Parse(`
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<html>
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<head>
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<title>Registration - Headscale</title>
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</head>
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<body>
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<h1>headscale</h1>
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<h2>Machine registration</h2>
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<p>
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Run the command below in the headscale server to add this machine to your network:
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</p>
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<pre><code>headscale nodes register --user USERNAME --key {{.Key}}</code></pre>
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</body>
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</html>
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`))
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// RegisterWebAPI shows a simple message in the browser to point to the CLI
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// Listens in /register/:nkey.
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//
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// This is not part of the Tailscale control API, as we could send whatever URL
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// in the RegisterResponse.AuthURL field.
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func (h *Headscale) RegisterWebAPI(
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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 := vars["mkey"]
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// We need to make sure we dont open for XSS style injections, if the parameter that
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// is passed as a key is not parsable/validated as a NodePublic key, then fail to render
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// the template and log an error.
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var machineKey key.MachinePublic
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err := machineKey.UnmarshalText(
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[]byte(machineKeyStr),
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)
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if err != nil {
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log.Warn().Err(err).Msg("Failed to parse incoming nodekey")
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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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var content bytes.Buffer
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if err := registerWebAPITemplate.Execute(&content, registerWebAPITemplateConfig{
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Key: machineKey.String(),
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}); err != nil {
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log.Error().
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Str("func", "RegisterWebAPI").
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Err(err).
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Msg("Could not render register web API template")
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writer.Header().Set("Content-Type", "text/plain; charset=utf-8")
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writer.WriteHeader(http.StatusInternalServerError)
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_, err = writer.Write([]byte("Could not render register web API template"))
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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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writer.Header().Set("Content-Type", "text/html; charset=utf-8")
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writer.WriteHeader(http.StatusOK)
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_, err = writer.Write(content.Bytes())
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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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