mirror of
https://github.com/juanfont/headscale.git
synced 2024-09-20 15:26:35 +08:00
622 lines
16 KiB
Go
622 lines
16 KiB
Go
package headscale
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import (
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"bytes"
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"encoding/binary"
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"encoding/json"
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"fmt"
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"html/template"
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"net/http"
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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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"tailscale.com/tailcfg"
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"tailscale.com/types/key"
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)
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const (
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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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RegisterMethodAuthKey = "authkey"
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RegisterMethodOIDC = "oidc"
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RegisterMethodCLI = "cli"
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ErrRegisterMethodCLIDoesNotSupportExpire = Error(
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"machines registered with CLI does not support expire",
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)
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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.
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// See https://github.com/tailscale/tailscale/blob/main/tailcfg/tailcfg.go
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NoiseCapabilityVersion = 28
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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.pingDB(); 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 -n NAMESPACE nodes register --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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nodeKeyStr, ok := vars["nkey"]
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if !ok || nodeKeyStr == "" {
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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: nodeKeyStr,
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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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func (h *Headscale) getLegacyMapResponseData(
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machineKey key.MachinePublic,
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mapRequest tailcfg.MapRequest,
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machine *Machine,
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) ([]byte, error) {
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resp, err := h.generateMapResponse(mapRequest, machine)
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if err != nil {
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return nil, err
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}
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var respBody []byte
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if mapRequest.Compress == ZstdCompression {
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src, err := json.Marshal(resp)
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if err != nil {
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log.Error().
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Caller().
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Str("func", "getMapResponse").
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Err(err).
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Msg("Failed to marshal 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(resp, &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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// declare the incoming size on the first 4 bytes
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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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machineKey key.MachinePublic,
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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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err := h.ExpireMachine(&machine)
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if err != nil {
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log.Error().
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Caller().
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Str("func", "handleMachineLogOut").
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Err(err).
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Msg("Failed to expire machine")
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http.Error(writer, "Internal server error", http.StatusInternalServerError)
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return
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}
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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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respBody, err := encode(resp, &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 encode message")
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http.Error(writer, "Internal server error", http.StatusInternalServerError)
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return
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}
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writer.Header().Set("Content-Type", "application/json; charset=utf-8")
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writer.WriteHeader(http.StatusOK)
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_, err = writer.Write(respBody)
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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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func (h *Headscale) handleMachineValidRegistration(
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writer http.ResponseWriter,
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req *http.Request,
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machineKey key.MachinePublic,
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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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respBody, err := encode(resp, &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 encode message")
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machineRegistrations.WithLabelValues("update", "web", "error", machine.Namespace.Name).
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Inc()
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http.Error(writer, "Internal server error", http.StatusInternalServerError)
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return
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}
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machineRegistrations.WithLabelValues("update", "web", "success", machine.Namespace.Name).
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Inc()
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writer.Header().Set("Content-Type", "application/json; charset=utf-8")
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writer.WriteHeader(http.StatusOK)
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_, err = writer.Write(respBody)
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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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func (h *Headscale) handleMachineExpired(
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writer http.ResponseWriter,
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req *http.Request,
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machineKey key.MachinePublic,
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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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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.handleAuthKey(writer, req, machineKey, 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, "/"),
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NodePublicKeyStripPrefix(registerRequest.NodeKey))
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} else {
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resp.AuthURL = fmt.Sprintf("%s/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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respBody, err := encode(resp, &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 encode message")
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machineRegistrations.WithLabelValues("reauth", "web", "error", machine.Namespace.Name).
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Inc()
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http.Error(writer, "Internal server error", http.StatusInternalServerError)
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return
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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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writer.Header().Set("Content-Type", "application/json; charset=utf-8")
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writer.WriteHeader(http.StatusOK)
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_, err = writer.Write(respBody)
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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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func (h *Headscale) handleMachineRefreshKey(
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writer http.ResponseWriter,
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req *http.Request,
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machineKey key.MachinePublic,
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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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if err := h.db.Save(&machine).Error; 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 update machine key in the database")
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http.Error(writer, "Internal server error", http.StatusInternalServerError)
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return
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}
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resp.AuthURL = ""
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resp.User = *machine.Namespace.toUser()
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respBody, err := encode(resp, &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 encode message")
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http.Error(writer, "Internal server error", http.StatusInternalServerError)
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return
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}
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writer.Header().Set("Content-Type", "application/json; charset=utf-8")
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writer.WriteHeader(http.StatusOK)
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_, err = writer.Write(respBody)
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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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func (h *Headscale) handleMachineRegistrationNew(
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writer http.ResponseWriter,
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req *http.Request,
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machineKey key.MachinePublic,
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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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Caller().
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Str("machine", registerRequest.Hostinfo.Hostname).
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Msg("The node seems to be new, 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/%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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respBody, err := encode(resp, &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 encode message")
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http.Error(writer, "Internal server error", http.StatusInternalServerError)
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return
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}
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writer.Header().Set("Content-Type", "application/json; charset=utf-8")
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writer.WriteHeader(http.StatusOK)
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_, err = writer.Write(respBody)
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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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// TODO: check if any locks are needed around IP allocation.
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func (h *Headscale) handleAuthKey(
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writer http.ResponseWriter,
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req *http.Request,
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machineKey key.MachinePublic,
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registerRequest tailcfg.RegisterRequest,
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) {
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machineKeyStr := MachinePublicKeyStripPrefix(machineKey)
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log.Debug().
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Str("func", "handleAuthKey").
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Str("machine", registerRequest.Hostinfo.Hostname).
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Msgf("Processing auth key for %s", 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("func", "handleAuthKey").
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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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respBody, err := encode(resp, &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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Str("func", "handleAuthKey").
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Str("machine", registerRequest.Hostinfo.Hostname).
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Err(err).
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Msg("Cannot encode message")
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http.Error(writer, "Internal server error", http.StatusInternalServerError)
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machineRegistrations.WithLabelValues("new", RegisterMethodAuthKey, "error", pak.Namespace.Name).
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Inc()
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return
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}
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writer.Header().Set("Content-Type", "application/json; charset=utf-8")
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writer.WriteHeader(http.StatusUnauthorized)
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_, err = writer.Write(respBody)
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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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log.Error().
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Caller().
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Str("func", "handleAuthKey").
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Str("machine", registerRequest.Hostinfo.Hostname).
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Msg("Failed authentication via AuthKey")
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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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|
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log.Debug().
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Str("func", "handleAuthKey").
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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.GetMachineByMachineKey(machineKey)
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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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err := h.RefreshMachine(machine, registerRequest.Expiry)
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if err != nil {
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log.Error().
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Caller().
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Str("machine", machine.Hostname).
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Err(err).
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Msg("Failed to refresh machine")
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return
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}
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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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|
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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: machineKeyStr,
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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().
|
|
Err(err).
|
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Msg("could not register machine")
|
|
machineRegistrations.WithLabelValues("new", RegisterMethodAuthKey, "error", pak.Namespace.Name).
|
|
Inc()
|
|
http.Error(writer, "Internal server error", http.StatusInternalServerError)
|
|
|
|
return
|
|
}
|
|
}
|
|
|
|
err = h.UsePreAuthKey(pak)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Err(err).
|
|
Msg("Failed to use pre-auth key")
|
|
machineRegistrations.WithLabelValues("new", RegisterMethodAuthKey, "error", pak.Namespace.Name).
|
|
Inc()
|
|
http.Error(writer, "Internal server error", http.StatusInternalServerError)
|
|
|
|
return
|
|
}
|
|
|
|
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()
|
|
http.Error(writer, "Internal server error", http.StatusInternalServerError)
|
|
|
|
return
|
|
}
|
|
machineRegistrations.WithLabelValues("new", RegisterMethodAuthKey, "success", pak.Namespace.Name).
|
|
Inc()
|
|
writer.Header().Set("Content-Type", "application/json; charset=utf-8")
|
|
writer.WriteHeader(http.StatusOK)
|
|
_, err = writer.Write(respBody)
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Err(err).
|
|
Msg("Failed to write response")
|
|
}
|
|
|
|
log.Info().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", registerRequest.Hostinfo.Hostname).
|
|
Str("ips", strings.Join(machine.IPAddresses.ToStringSlice(), ", ")).
|
|
Msg("Successfully authenticated via AuthKey")
|
|
}
|