mirror of
https://github.com/juanfont/headscale.git
synced 2024-11-23 18:15:26 +00:00
eda0a9f88a
current logic is not safe as it will allow an IP that isnt persisted to the DB to be given out multiple times if machines joins in quick succession. This adds a lock around the "get ip" and machine registration and save to DB so we ensure thiis isnt happning. Currently this had to be done three places, which is silly, and outlined in #294.
640 lines
16 KiB
Go
640 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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"errors"
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"fmt"
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"html/template"
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"io"
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"net/http"
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"strings"
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"time"
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"github.com/gin-gonic/gin"
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"github.com/klauspost/compress/zstd"
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"github.com/rs/zerolog/log"
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"gorm.io/gorm"
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"tailscale.com/tailcfg"
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"tailscale.com/types/key"
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)
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const (
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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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)
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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(ctx *gin.Context) {
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ctx.Data(
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http.StatusOK,
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"text/plain; charset=utf-8",
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[]byte(MachinePublicKeyStripPrefix(h.privateKey.Public())),
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)
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}
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type registerWebAPITemplateConfig struct {
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Key string
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}
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var registerWebAPITemplate = template.Must(
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template.New("registerweb").Parse(`<html>
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<body>
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<h1>headscale</h1>
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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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<p>
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<code>
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<b>headscale -n NAMESPACE nodes register --key {{.Key}}</b>
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</code>
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</p>
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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.
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func (h *Headscale) RegisterWebAPI(ctx *gin.Context) {
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machineKeyStr := ctx.Query("key")
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if machineKeyStr == "" {
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ctx.String(http.StatusBadRequest, "Wrong params")
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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: machineKeyStr,
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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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ctx.Data(
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http.StatusInternalServerError,
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"text/html; charset=utf-8",
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[]byte("Could not render register web API template"),
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)
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}
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ctx.Data(http.StatusOK, "text/html; charset=utf-8", content.Bytes())
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}
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// RegistrationHandler handles the actual registration process of a machine
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// Endpoint /machine/:id.
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func (h *Headscale) RegistrationHandler(ctx *gin.Context) {
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body, _ := io.ReadAll(ctx.Request.Body)
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machineKeyStr := ctx.Param("id")
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var machineKey key.MachinePublic
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err := machineKey.UnmarshalText([]byte(MachinePublicKeyEnsurePrefix(machineKeyStr)))
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if err != nil {
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log.Error().
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Caller().
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Err(err).
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Msg("Cannot parse machine key")
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machineRegistrations.WithLabelValues("unknown", "web", "error", "unknown").Inc()
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ctx.String(http.StatusInternalServerError, "Sad!")
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return
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}
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req := tailcfg.RegisterRequest{}
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err = decode(body, &req, &machineKey, h.privateKey)
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if err != nil {
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log.Error().
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Caller().
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Err(err).
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Msg("Cannot decode message")
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machineRegistrations.WithLabelValues("unknown", "web", "error", "unknown").Inc()
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ctx.String(http.StatusInternalServerError, "Very sad!")
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return
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}
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now := time.Now().UTC()
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machine, err := h.GetMachineByMachineKey(machineKey)
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if errors.Is(err, gorm.ErrRecordNotFound) {
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log.Info().Str("machine", req.Hostinfo.Hostname).Msg("New machine")
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newMachine := Machine{
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Expiry: &time.Time{},
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MachineKey: MachinePublicKeyStripPrefix(machineKey),
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Name: req.Hostinfo.Hostname,
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}
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if err := h.db.Create(&newMachine).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("Could not create row")
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machineRegistrations.WithLabelValues("unknown", "web", "error", machine.Namespace.Name).
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Inc()
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return
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}
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machine = &newMachine
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}
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if machine.Registered {
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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(req.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 !req.Expiry.IsZero() && req.Expiry.UTC().Before(now) {
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h.handleMachineLogOut(ctx, machineKey, *machine)
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return
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}
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// If machine is not expired, and is register, we have a already accepted this machine,
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// let it proceed with a valid registration
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if !machine.isExpired() {
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h.handleMachineValidRegistration(ctx, machineKey, *machine)
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return
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}
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}
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// The NodeKey we have matches OldNodeKey, which means this is a refresh after a key expiration
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if machine.NodeKey == NodePublicKeyStripPrefix(req.OldNodeKey) &&
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!machine.isExpired() {
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h.handleMachineRefreshKey(ctx, machineKey, req, *machine)
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return
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}
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// The machine has expired
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h.handleMachineExpired(ctx, machineKey, req, *machine)
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return
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}
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// If the machine has AuthKey set, handle registration via PreAuthKeys
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if req.Auth.AuthKey != "" {
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h.handleAuthKey(ctx, machineKey, req, *machine)
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return
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}
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h.handleMachineRegistrationNew(ctx, machineKey, req, *machine)
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}
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func (h *Headscale) getMapResponse(
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machineKey key.MachinePublic,
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req tailcfg.MapRequest,
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machine *Machine,
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) ([]byte, error) {
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log.Trace().
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Str("func", "getMapResponse").
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Str("machine", req.Hostinfo.Hostname).
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Msg("Creating Map response")
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node, err := machine.toNode(h.cfg.BaseDomain, h.cfg.DNSConfig, true)
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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("Cannot convert to node")
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return nil, err
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}
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peers, err := h.getValidPeers(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", "getMapResponse").
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Err(err).
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Msg("Cannot fetch peers")
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return nil, err
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}
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profiles := getMapResponseUserProfiles(*machine, peers)
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nodePeers, err := peers.toNodes(h.cfg.BaseDomain, h.cfg.DNSConfig, true)
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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 convert peers to Tailscale nodes")
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return nil, err
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}
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dnsConfig := getMapResponseDNSConfig(
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h.cfg.DNSConfig,
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h.cfg.BaseDomain,
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*machine,
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peers,
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)
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resp := tailcfg.MapResponse{
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KeepAlive: false,
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Node: node,
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Peers: nodePeers,
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DNSConfig: dnsConfig,
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Domain: h.cfg.BaseDomain,
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PacketFilter: h.aclRules,
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DERPMap: h.DERPMap,
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UserProfiles: profiles,
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}
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log.Trace().
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Str("func", "getMapResponse").
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Str("machine", req.Hostinfo.Hostname).
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// Interface("payload", resp).
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Msgf("Generated map response: %s", tailMapResponseToString(resp))
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var respBody []byte
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if req.Compress == "zstd" {
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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) getMapKeepAliveResponse(
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machineKey key.MachinePublic,
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mapRequest tailcfg.MapRequest,
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) ([]byte, error) {
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mapResponse := tailcfg.MapResponse{
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KeepAlive: true,
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}
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var respBody []byte
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var err error
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if mapRequest.Compress == "zstd" {
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src, err := json.Marshal(mapResponse)
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if err != nil {
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log.Error().
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Caller().
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Str("func", "getMapKeepAliveResponse").
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Err(err).
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Msg("Failed to marshal keepalive response for the client")
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return nil, err
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}
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encoder, _ := zstd.NewWriter(nil)
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srcCompressed := encoder.EncodeAll(src, nil)
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respBody = h.privateKey.SealTo(machineKey, srcCompressed)
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} else {
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respBody, err = encode(mapResponse, &machineKey, h.privateKey)
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if err != nil {
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return nil, err
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}
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}
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data := make([]byte, reservedResponseHeaderSize)
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binary.LittleEndian.PutUint32(data, uint32(len(respBody)))
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data = append(data, respBody...)
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return data, nil
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}
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func (h *Headscale) handleMachineLogOut(
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ctx *gin.Context,
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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.Name).
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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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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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ctx.String(http.StatusInternalServerError, "")
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return
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}
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ctx.Data(http.StatusOK, "application/json; charset=utf-8", respBody)
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}
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func (h *Headscale) handleMachineValidRegistration(
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ctx *gin.Context,
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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.Name).
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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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ctx.String(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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ctx.Data(http.StatusOK, "application/json; charset=utf-8", respBody)
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}
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func (h *Headscale) handleMachineExpired(
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ctx *gin.Context,
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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.Name).
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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(ctx, machineKey, registerRequest, machine)
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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, "/"), machineKey.String())
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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, "/"), machineKey.String())
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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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ctx.String(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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ctx.Data(http.StatusOK, "application/json; charset=utf-8", respBody)
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}
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func (h *Headscale) handleMachineRefreshKey(
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ctx *gin.Context,
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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.Name).
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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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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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ctx.String(http.StatusInternalServerError, "Extremely sad!")
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return
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}
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ctx.Data(http.StatusOK, "application/json; charset=utf-8", respBody)
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}
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func (h *Headscale) handleMachineRegistrationNew(
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ctx *gin.Context,
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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 machine registration is new, redirect the client to the registration URL
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log.Debug().
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Str("machine", machine.Name).
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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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machineKey.String(),
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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, "/"), MachinePublicKeyStripPrefix(machineKey))
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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", machine.Name).
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Time("expiry", registerRequest.Expiry).
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Msg("Non-zero expiry time requested, adding to cache")
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h.requestedExpiryCache.Set(
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machineKey.String(),
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registerRequest.Expiry,
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requestedExpiryCacheExpiration,
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)
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}
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machine.NodeKey = NodePublicKeyStripPrefix(registerRequest.NodeKey)
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// save the NodeKey
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h.db.Save(&machine)
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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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ctx.String(http.StatusInternalServerError, "")
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return
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}
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ctx.Data(http.StatusOK, "application/json; charset=utf-8", respBody)
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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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ctx *gin.Context,
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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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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", machine.Name).
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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", machine.Name).
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Err(err).
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Msg("Cannot encode message")
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ctx.String(http.StatusInternalServerError, "")
|
|
machineRegistrations.WithLabelValues("new", "authkey", "error", machine.Namespace.Name).
|
|
Inc()
|
|
|
|
return
|
|
}
|
|
ctx.Data(http.StatusUnauthorized, "application/json; charset=utf-8", respBody)
|
|
log.Error().
|
|
Caller().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", machine.Name).
|
|
Msg("Failed authentication via AuthKey")
|
|
machineRegistrations.WithLabelValues("new", "authkey", "error", machine.Namespace.Name).
|
|
Inc()
|
|
|
|
return
|
|
}
|
|
|
|
if machine.isRegistered() {
|
|
log.Trace().
|
|
Caller().
|
|
Str("machine", machine.Name).
|
|
Msg("machine already registered, reauthenticating")
|
|
|
|
h.RefreshMachine(&machine, registerRequest.Expiry)
|
|
} else {
|
|
log.Debug().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", machine.Name).
|
|
Msg("Authentication key was valid, proceeding to acquire IP addresses")
|
|
|
|
h.ipAllocationMutex.Lock()
|
|
|
|
ips, err := h.getAvailableIPs()
|
|
if err != nil {
|
|
log.Error().
|
|
Caller().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", machine.Name).
|
|
Msg("Failed to find an available IP address")
|
|
machineRegistrations.WithLabelValues("new", "authkey", "error", machine.Namespace.Name).
|
|
Inc()
|
|
|
|
return
|
|
}
|
|
log.Info().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", machine.Name).
|
|
Str("ips", strings.Join(ips.ToStringSlice(), ",")).
|
|
Msgf("Assigning %s to %s", strings.Join(ips.ToStringSlice(), ","), machine.Name)
|
|
|
|
machine.Expiry = ®isterRequest.Expiry
|
|
machine.AuthKeyID = uint(pak.ID)
|
|
machine.IPAddresses = ips
|
|
machine.NamespaceID = pak.NamespaceID
|
|
|
|
machine.NodeKey = NodePublicKeyStripPrefix(registerRequest.NodeKey)
|
|
// we update it just in case
|
|
machine.Registered = true
|
|
machine.RegisterMethod = RegisterMethodAuthKey
|
|
h.db.Save(&machine)
|
|
|
|
h.ipAllocationMutex.Unlock()
|
|
}
|
|
|
|
pak.Used = true
|
|
h.db.Save(&pak)
|
|
|
|
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", machine.Name).
|
|
Err(err).
|
|
Msg("Cannot encode message")
|
|
machineRegistrations.WithLabelValues("new", "authkey", "error", machine.Namespace.Name).
|
|
Inc()
|
|
ctx.String(http.StatusInternalServerError, "Extremely sad!")
|
|
|
|
return
|
|
}
|
|
machineRegistrations.WithLabelValues("new", "authkey", "success", machine.Namespace.Name).
|
|
Inc()
|
|
ctx.Data(http.StatusOK, "application/json; charset=utf-8", respBody)
|
|
log.Info().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", machine.Name).
|
|
Str("ips", strings.Join(machine.IPAddresses.ToStringSlice(), ", ")).
|
|
Msg("Successfully authenticated via AuthKey")
|
|
}
|