mirror of
https://github.com/juanfont/headscale.git
synced 2024-09-20 23:37:07 +08:00
1abc68ccf4
This commit removes most of the locks in the PollingMap handler as there was combinations that caused deadlocks. Instead of doing a plain map and doing the locking ourselves, we use sync.Map which handles it for us.
644 lines
17 KiB
Go
644 lines
17 KiB
Go
package headscale
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import (
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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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"io"
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"net/http"
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"time"
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"github.com/rs/zerolog/log"
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"github.com/gin-gonic/gin"
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"github.com/klauspost/compress/zstd"
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"gorm.io/datatypes"
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"gorm.io/gorm"
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"inet.af/netaddr"
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"tailscale.com/tailcfg"
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"tailscale.com/types/wgkey"
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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(c *gin.Context) {
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c.Data(200, "text/plain; charset=utf-8", []byte(h.publicKey.HexString()))
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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(c *gin.Context) {
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mKeyStr := c.Query("key")
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if mKeyStr == "" {
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c.String(http.StatusBadRequest, "Wrong params")
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return
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}
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// spew.Dump(c.Params)
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c.Data(http.StatusOK, "text/html; charset=utf-8", []byte(fmt.Sprintf(`
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<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 %s</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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`, mKeyStr)))
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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(c *gin.Context) {
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body, _ := io.ReadAll(c.Request.Body)
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mKeyStr := c.Param("id")
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mKey, err := wgkey.ParseHex(mKeyStr)
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if err != nil {
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log.Error().
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Str("handler", "Registration").
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Err(err).
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Msg("Cannot parse machine key")
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c.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, &mKey, h.privateKey)
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if err != nil {
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log.Error().
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Str("handler", "Registration").
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Err(err).
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Msg("Cannot decode message")
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c.String(http.StatusInternalServerError, "Very sad!")
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return
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}
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var m Machine
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if result := h.db.Preload("Namespace").First(&m, "machine_key = ?", mKey.HexString()); errors.Is(result.Error, gorm.ErrRecordNotFound) {
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log.Info().Str("machine", req.Hostinfo.Hostname).Msg("New machine")
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m = Machine{
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Expiry: &req.Expiry,
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MachineKey: mKey.HexString(),
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Name: req.Hostinfo.Hostname,
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NodeKey: wgkey.Key(req.NodeKey).HexString(),
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}
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if err := h.db.Create(&m).Error; err != nil {
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log.Error().
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Str("handler", "Registration").
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Err(err).
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Msg("Could not create row")
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return
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}
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}
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if !m.Registered && req.Auth.AuthKey != "" {
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h.handleAuthKey(c, h.db, mKey, req, m)
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return
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}
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resp := tailcfg.RegisterResponse{}
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// We have the updated key!
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if m.NodeKey == wgkey.Key(req.NodeKey).HexString() {
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if m.Registered {
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log.Debug().
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Str("handler", "Registration").
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Str("machine", m.Name).
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Msg("Client is registered and we have the current NodeKey. All clear to /mSending keepaliveap")
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resp.AuthURL = ""
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resp.MachineAuthorized = true
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resp.User = *m.Namespace.toUser()
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respBody, err := encode(resp, &mKey, h.privateKey)
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if err != nil {
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log.Error().
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Str("handler", "Registration").
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Err(err).
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Msg("Cannot encode message")
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c.String(http.StatusInternalServerError, "")
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return
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}
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c.Data(200, "application/json; charset=utf-8", respBody)
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return
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}
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log.Debug().
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Str("handler", "Registration").
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Str("machine", m.Name).
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Msg("Not registered and not NodeKey rotation. Sending a authurl to register")
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resp.AuthURL = fmt.Sprintf("%s/register?key=%s",
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h.cfg.ServerURL, mKey.HexString())
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respBody, err := encode(resp, &mKey, h.privateKey)
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if err != nil {
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log.Error().
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Str("handler", "Registration").
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Err(err).
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Msg("Cannot encode message")
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c.String(http.StatusInternalServerError, "")
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return
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}
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c.Data(200, "application/json; charset=utf-8", respBody)
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return
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}
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// The NodeKey we have matches OldNodeKey, which means this is a refresh after an key expiration
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if m.NodeKey == wgkey.Key(req.OldNodeKey).HexString() {
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log.Debug().
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Str("handler", "Registration").
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Str("machine", m.Name).
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Msg("We have the OldNodeKey in the database. This is a key refresh")
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m.NodeKey = wgkey.Key(req.NodeKey).HexString()
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h.db.Save(&m)
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resp.AuthURL = ""
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resp.User = *m.Namespace.toUser()
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respBody, err := encode(resp, &mKey, h.privateKey)
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if err != nil {
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log.Error().
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Str("handler", "Registration").
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Err(err).
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Msg("Cannot encode message")
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c.String(http.StatusInternalServerError, "Extremely sad!")
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return
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}
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c.Data(200, "application/json; charset=utf-8", respBody)
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return
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}
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// We arrive here after a client is restarted without finalizing the authentication flow or
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// when headscale is stopped in the middle of the auth process.
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if m.Registered {
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log.Debug().
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Str("handler", "Registration").
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Str("machine", m.Name).
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Msg("The node is sending us a new NodeKey, but machine is registered. All clear for /map")
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resp.AuthURL = ""
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resp.MachineAuthorized = true
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resp.User = *m.Namespace.toUser()
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respBody, err := encode(resp, &mKey, h.privateKey)
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if err != nil {
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log.Error().
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Str("handler", "Registration").
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Err(err).
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Msg("Cannot encode message")
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c.String(http.StatusInternalServerError, "")
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return
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}
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c.Data(200, "application/json; charset=utf-8", respBody)
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return
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}
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log.Debug().
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Str("handler", "Registration").
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Str("machine", m.Name).
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Msg("The node is sending us a new NodeKey, sending auth url")
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resp.AuthURL = fmt.Sprintf("%s/register?key=%s",
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h.cfg.ServerURL, mKey.HexString())
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respBody, err := encode(resp, &mKey, h.privateKey)
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if err != nil {
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log.Error().
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Str("handler", "Registration").
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Err(err).
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Msg("Cannot encode message")
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c.String(http.StatusInternalServerError, "")
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return
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}
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c.Data(200, "application/json; charset=utf-8", respBody)
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}
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// PollNetMapHandler takes care of /machine/:id/map
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//
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// This is the busiest endpoint, as it keeps the HTTP long poll that updates
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// the clients when something in the network changes.
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//
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// The clients POST stuff like HostInfo and their Endpoints here, but
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// only after their first request (marked with the ReadOnly field).
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//
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// At this moment the updates are sent in a quite horrendous way, but they kinda work.
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func (h *Headscale) PollNetMapHandler(c *gin.Context) {
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log.Trace().
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Str("handler", "PollNetMap").
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Str("id", c.Param("id")).
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Msg("PollNetMapHandler called")
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body, _ := io.ReadAll(c.Request.Body)
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mKeyStr := c.Param("id")
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mKey, err := wgkey.ParseHex(mKeyStr)
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if err != nil {
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log.Error().
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Str("handler", "PollNetMap").
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Err(err).
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Msg("Cannot parse client key")
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c.String(http.StatusBadRequest, "")
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return
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}
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req := tailcfg.MapRequest{}
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err = decode(body, &req, &mKey, h.privateKey)
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if err != nil {
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log.Error().
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Str("handler", "PollNetMap").
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Err(err).
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Msg("Cannot decode message")
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c.String(http.StatusBadRequest, "")
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return
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}
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var m Machine
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if result := h.db.Preload("Namespace").First(&m, "machine_key = ?", mKey.HexString()); errors.Is(result.Error, gorm.ErrRecordNotFound) {
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log.Warn().
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Str("handler", "PollNetMap").
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Msgf("Ignoring request, cannot find machine with key %s", mKey.HexString())
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c.String(http.StatusUnauthorized, "")
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return
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}
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log.Trace().
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Str("handler", "PollNetMap").
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Str("id", c.Param("id")).
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Str("machine", m.Name).
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Msg("Found machine in database")
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hostinfo, _ := json.Marshal(req.Hostinfo)
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m.Name = req.Hostinfo.Hostname
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m.HostInfo = datatypes.JSON(hostinfo)
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m.DiscoKey = wgkey.Key(req.DiscoKey).HexString()
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now := time.Now().UTC()
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// From Tailscale client:
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//
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// ReadOnly is whether the client just wants to fetch the MapResponse,
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// without updating their Endpoints. The Endpoints field will be ignored and
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// LastSeen will not be updated and peers will not be notified of changes.
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//
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// The intended use is for clients to discover the DERP map at start-up
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// before their first real endpoint update.
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if !req.ReadOnly {
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endpoints, _ := json.Marshal(req.Endpoints)
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m.Endpoints = datatypes.JSON(endpoints)
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m.LastSeen = &now
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}
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h.db.Save(&m)
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update := make(chan []byte, 1)
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pollData := make(chan []byte, 1)
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defer close(pollData)
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cancelKeepAlive := make(chan []byte, 1)
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defer close(cancelKeepAlive)
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log.Trace().
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Str("handler", "PollNetMap").
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Str("id", c.Param("id")).
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Str("machine", m.Name).
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Msg("Locking poll mutex")
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h.clientsPolling.Store(m.ID, update)
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log.Trace().
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Str("handler", "PollNetMap").
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Str("id", c.Param("id")).
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Str("machine", m.Name).
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Msg("Unlocking poll mutex")
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data, err := h.getMapResponse(mKey, req, m)
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if err != nil {
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log.Error().
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Str("handler", "PollNetMap").
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Str("id", c.Param("id")).
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Str("machine", m.Name).
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Err(err).
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Msg("Failed to get Map response")
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c.String(http.StatusInternalServerError, ":(")
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return
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}
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// We update our peers if the client is not sending ReadOnly in the MapRequest
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// so we don't distribute its initial request (it comes with
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// empty endpoints to peers)
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// Details on the protocol can be found in https://github.com/tailscale/tailscale/blob/main/tailcfg/tailcfg.go#L696
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log.Debug().
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Str("handler", "PollNetMap").
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Str("id", c.Param("id")).
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Str("machine", m.Name).
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Bool("readOnly", req.ReadOnly).
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Bool("omitPeers", req.OmitPeers).
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Bool("stream", req.Stream).
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Msg("Client map request processed")
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if req.ReadOnly {
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log.Info().
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Str("handler", "PollNetMap").
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Str("machine", m.Name).
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Msg("Client is starting up. Asking for DERP map")
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c.Data(200, "application/json; charset=utf-8", *data)
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return
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}
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if req.OmitPeers && !req.Stream {
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log.Info().
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Str("handler", "PollNetMap").
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Str("machine", m.Name).
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Msg("Client sent endpoint update and is ok with a response without peer list")
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c.Data(200, "application/json; charset=utf-8", *data)
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return
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} else if req.OmitPeers && req.Stream {
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log.Warn().
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Str("handler", "PollNetMap").
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Str("machine", m.Name).
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Msg("Ignoring request, don't know how to handle it")
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c.String(http.StatusBadRequest, "")
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return
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}
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log.Info().
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Str("handler", "PollNetMap").
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Str("machine", m.Name).
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Msg("Client is ready to access the tailnet")
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log.Info().
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Str("handler", "PollNetMap").
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Str("machine", m.Name).
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Msg("Sending initial map")
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pollData <- *data
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log.Info().
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Str("handler", "PollNetMap").
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Str("machine", m.Name).
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Msg("Notifying peers")
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peers, _ := h.getPeers(m)
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for _, p := range *peers {
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pUp, ok := h.clientsPolling.Load(uint64(p.ID))
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if ok {
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log.Info().
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Str("handler", "PollNetMap").
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Str("machine", m.Name).
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Str("peer", m.Name).
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Str("address", p.Addresses[0].String()).
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Msgf("Notifying peer %s (%s)", p.Name, p.Addresses[0])
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pUp.(chan []byte) <- []byte{}
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} else {
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log.Info().
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Str("handler", "PollNetMap").
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Str("machine", m.Name).
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Str("peer", m.Name).
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Msgf("Peer %s does not appear to be polling", p.Name)
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}
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}
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go h.keepAlive(cancelKeepAlive, pollData, mKey, req, m)
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c.Stream(func(w io.Writer) bool {
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select {
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case data := <-pollData:
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log.Trace().
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Str("handler", "PollNetMap").
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Str("machine", m.Name).
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Int("bytes", len(data)).
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Msg("Sending data")
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_, err := w.Write(data)
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if err != nil {
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log.Error().
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Str("handler", "PollNetMap").
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Str("machine", m.Name).
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Err(err).
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Msg("Cannot write data")
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}
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now := time.Now().UTC()
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m.LastSeen = &now
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h.db.Save(&m)
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return true
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case <-update:
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log.Debug().
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Str("handler", "PollNetMap").
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Str("machine", m.Name).
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Msg("Received a request for update")
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data, err := h.getMapResponse(mKey, req, m)
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if err != nil {
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log.Error().
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Str("handler", "PollNetMap").
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Str("machine", m.Name).
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Err(err).
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Msg("Could not get the map update")
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}
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_, err = w.Write(*data)
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if err != nil {
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log.Error().
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Str("handler", "PollNetMap").
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Str("machine", m.Name).
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Err(err).
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Msg("Could not write the map response")
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}
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return true
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case <-c.Request.Context().Done():
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log.Info().
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Str("handler", "PollNetMap").
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Str("machine", m.Name).
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Msg("The client has closed the connection")
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now := time.Now().UTC()
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m.LastSeen = &now
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h.db.Save(&m)
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cancelKeepAlive <- []byte{}
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h.clientsPolling.Delete(m.ID)
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close(update)
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return false
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}
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})
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}
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func (h *Headscale) keepAlive(cancel chan []byte, pollData chan []byte, mKey wgkey.Key, req tailcfg.MapRequest, m Machine) {
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for {
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select {
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case <-cancel:
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return
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default:
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h.pollMu.Lock()
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data, err := h.getMapKeepAliveResponse(mKey, req, m)
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if err != nil {
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log.Error().
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Str("func", "keepAlive").
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Err(err).
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Msg("Error generating the keep alive msg")
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return
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}
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log.Debug().
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Str("func", "keepAlive").
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Str("machine", m.Name).
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Msg("Sending keepalive")
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pollData <- *data
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h.pollMu.Unlock()
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time.Sleep(60 * time.Second)
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}
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}
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}
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func (h *Headscale) getMapResponse(mKey wgkey.Key, req tailcfg.MapRequest, m Machine) (*[]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 := m.toNode()
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if err != nil {
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log.Error().
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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.getPeers(m)
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if err != nil {
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log.Error().
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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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profile := tailcfg.UserProfile{
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ID: tailcfg.UserID(m.NamespaceID),
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LoginName: m.Namespace.Name,
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DisplayName: m.Namespace.Name,
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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: *peers,
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DNS: []netaddr.IP{},
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SearchPaths: []string{},
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Domain: "headscale.net",
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PacketFilter: *h.aclRules,
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DERPMap: h.cfg.DerpMap,
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UserProfiles: []tailcfg.UserProfile{profile},
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}
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var respBody []byte
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if req.Compress == "zstd" {
|
|
src, _ := json.Marshal(resp)
|
|
encoder, _ := zstd.NewWriter(nil)
|
|
srcCompressed := encoder.EncodeAll(src, nil)
|
|
respBody, err = encodeMsg(srcCompressed, &mKey, h.privateKey)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
} else {
|
|
respBody, err = encode(resp, &mKey, h.privateKey)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
// spew.Dump(resp)
|
|
// declare the incoming size on the first 4 bytes
|
|
data := make([]byte, 4)
|
|
binary.LittleEndian.PutUint32(data, uint32(len(respBody)))
|
|
data = append(data, respBody...)
|
|
return &data, nil
|
|
}
|
|
|
|
func (h *Headscale) getMapKeepAliveResponse(mKey wgkey.Key, req tailcfg.MapRequest, m Machine) (*[]byte, error) {
|
|
resp := tailcfg.MapResponse{
|
|
KeepAlive: true,
|
|
}
|
|
var respBody []byte
|
|
var err error
|
|
if req.Compress == "zstd" {
|
|
src, _ := json.Marshal(resp)
|
|
encoder, _ := zstd.NewWriter(nil)
|
|
srcCompressed := encoder.EncodeAll(src, nil)
|
|
respBody, err = encodeMsg(srcCompressed, &mKey, h.privateKey)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
} else {
|
|
respBody, err = encode(resp, &mKey, h.privateKey)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
data := make([]byte, 4)
|
|
binary.LittleEndian.PutUint32(data, uint32(len(respBody)))
|
|
data = append(data, respBody...)
|
|
return &data, nil
|
|
}
|
|
|
|
func (h *Headscale) handleAuthKey(c *gin.Context, db *gorm.DB, idKey wgkey.Key, req tailcfg.RegisterRequest, m Machine) {
|
|
log.Debug().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", req.Hostinfo.Hostname).
|
|
Msgf("Processing auth key for %s", req.Hostinfo.Hostname)
|
|
resp := tailcfg.RegisterResponse{}
|
|
pak, err := h.checkKeyValidity(req.Auth.AuthKey)
|
|
if err != nil {
|
|
resp.MachineAuthorized = false
|
|
respBody, err := encode(resp, &idKey, h.privateKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", m.Name).
|
|
Err(err).
|
|
Msg("Cannot encode message")
|
|
c.String(http.StatusInternalServerError, "")
|
|
return
|
|
}
|
|
c.Data(200, "application/json; charset=utf-8", respBody)
|
|
log.Error().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", m.Name).
|
|
Msg("Failed authentication via AuthKey")
|
|
return
|
|
}
|
|
|
|
log.Debug().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", m.Name).
|
|
Msg("Authentication key was valid, proceeding to acquire an IP address")
|
|
ip, err := h.getAvailableIP()
|
|
if err != nil {
|
|
log.Error().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", m.Name).
|
|
Msg("Failed to find an available IP")
|
|
return
|
|
}
|
|
log.Info().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", m.Name).
|
|
Str("ip", ip.String()).
|
|
Msgf("Assining %s to %s", ip, m.Name)
|
|
|
|
m.AuthKeyID = uint(pak.ID)
|
|
m.IPAddress = ip.String()
|
|
m.NamespaceID = pak.NamespaceID
|
|
m.NodeKey = wgkey.Key(req.NodeKey).HexString() // we update it just in case
|
|
m.Registered = true
|
|
m.RegisterMethod = "authKey"
|
|
db.Save(&m)
|
|
|
|
resp.MachineAuthorized = true
|
|
resp.User = *pak.Namespace.toUser()
|
|
respBody, err := encode(resp, &idKey, h.privateKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", m.Name).
|
|
Err(err).
|
|
Msg("Cannot encode message")
|
|
c.String(http.StatusInternalServerError, "Extremely sad!")
|
|
return
|
|
}
|
|
c.Data(200, "application/json; charset=utf-8", respBody)
|
|
log.Info().
|
|
Str("func", "handleAuthKey").
|
|
Str("machine", m.Name).
|
|
Str("ip", ip.String()).
|
|
Msg("Successfully authenticated via AuthKey")
|
|
}
|