package headscale import ( "bytes" "encoding/json" "html/template" "net/http" "time" "github.com/gorilla/mux" "github.com/rs/zerolog/log" "tailscale.com/types/key" ) const ( // TODO(juan): remove this once https://github.com/juanfont/headscale/issues/727 is fixed. registrationHoldoff = time.Second * 5 reservedResponseHeaderSize = 4 RegisterMethodAuthKey = "authkey" RegisterMethodOIDC = "oidc" RegisterMethodCLI = "cli" ErrRegisterMethodCLIDoesNotSupportExpire = Error( "node registered with CLI does not support expire", ) ) func (h *Headscale) HealthHandler( writer http.ResponseWriter, req *http.Request, ) { respond := func(err error) { writer.Header().Set("Content-Type", "application/health+json; charset=utf-8") res := struct { Status string `json:"status"` }{ Status: "pass", } if err != nil { writer.WriteHeader(http.StatusInternalServerError) log.Error().Caller().Err(err).Msg("health check failed") res.Status = "fail" } buf, err := json.Marshal(res) if err != nil { log.Error().Caller().Err(err).Msg("marshal failed") } _, err = writer.Write(buf) if err != nil { log.Error().Caller().Err(err).Msg("write failed") } } if err := h.pingDB(req.Context()); err != nil { respond(err) return } respond(nil) } type registerWebAPITemplateConfig struct { Key string } var registerWebAPITemplate = template.Must( template.New("registerweb").Parse(` Registration - Headscale

headscale

Node registration

Run the command below in the headscale server to add this node to your network:

headscale nodes register --user USERNAME --key {{.Key}}

`)) // RegisterWebAPI shows a simple message in the browser to point to the CLI // Listens in /register/:nkey. // // This is not part of the Tailscale control API, as we could send whatever URL // in the RegisterResponse.AuthURL field. func (h *Headscale) RegisterWebAPI( writer http.ResponseWriter, req *http.Request, ) { vars := mux.Vars(req) nodeKeyStr, ok := vars["nkey"] if !NodePublicKeyRegex.Match([]byte(nodeKeyStr)) { log.Warn().Str("node_key", nodeKeyStr).Msg("Invalid node key passed to registration url") writer.Header().Set("Content-Type", "text/plain; charset=utf-8") writer.WriteHeader(http.StatusUnauthorized) _, err := writer.Write([]byte("Unauthorized")) if err != nil { log.Error(). Caller(). Err(err). Msg("Failed to write response") } return } // We need to make sure we dont open for XSS style injections, if the parameter that // is passed as a key is not parsable/validated as a NodePublic key, then fail to render // the template and log an error. var nodeKey key.NodePublic err := nodeKey.UnmarshalText( []byte(NodePublicKeyEnsurePrefix(nodeKeyStr)), ) if !ok || nodeKeyStr == "" || err != nil { log.Warn().Err(err).Msg("Failed to parse incoming nodekey") writer.Header().Set("Content-Type", "text/plain; charset=utf-8") writer.WriteHeader(http.StatusBadRequest) _, err := writer.Write([]byte("Wrong params")) if err != nil { log.Error(). Caller(). Err(err). Msg("Failed to write response") } return } var content bytes.Buffer if err := registerWebAPITemplate.Execute(&content, registerWebAPITemplateConfig{ Key: nodeKeyStr, }); err != nil { log.Error(). Str("func", "RegisterWebAPI"). Err(err). Msg("Could not render register web API template") writer.Header().Set("Content-Type", "text/plain; charset=utf-8") writer.WriteHeader(http.StatusInternalServerError) _, err = writer.Write([]byte("Could not render register web API template")) if err != nil { log.Error(). Caller(). Err(err). Msg("Failed to write response") } return } writer.Header().Set("Content-Type", "text/html; charset=utf-8") writer.WriteHeader(http.StatusOK) _, err = writer.Write(content.Bytes()) if err != nil { log.Error(). Caller(). Err(err). Msg("Failed to write response") } }