2020-06-21 06:32:08 -04:00
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package headscale
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import (
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"encoding/binary"
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"encoding/json"
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"fmt"
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"io"
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"log"
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"net/http"
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"time"
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"github.com/gin-gonic/gin"
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"github.com/jinzhu/gorm"
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"github.com/klauspost/compress/zstd"
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2021-05-14 18:05:41 -04:00
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"gorm.io/datatypes"
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2021-02-20 16:43:07 -05:00
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"inet.af/netaddr"
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2020-06-21 06:32:08 -04:00
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"tailscale.com/tailcfg"
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2021-02-20 16:43:07 -05:00
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"tailscale.com/wgengine/wgcfg"
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2020-06-21 06:32:08 -04:00
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)
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2021-02-27 18:58:09 -05:00
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// KeyHandler provides the Headscale pub key
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// Listens in /key
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2020-06-21 06:32:08 -04:00
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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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2021-02-27 18:58:09 -05:00
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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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2021-05-05 19:03:43 -04:00
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// spew.Dump(c.Params)
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2021-05-05 18:59:26 -04:00
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2021-02-27 18:58:09 -05:00
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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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2021-05-14 18:05:41 -04:00
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Run the command below in the headscale server to add this machine to your network:
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2021-02-27 18:58:09 -05:00
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</p>
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<p>
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<code>
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2021-05-01 14:05:10 -04:00
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<b>headscale -n NAMESPACE node register %s</b>
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2021-02-27 18:58:09 -05:00
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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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2020-06-21 06:32:08 -04:00
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func (h *Headscale) RegistrationHandler(c *gin.Context) {
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2021-02-21 17:54:15 -05:00
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body, _ := io.ReadAll(c.Request.Body)
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2020-06-21 06:32:08 -04:00
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mKeyStr := c.Param("id")
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mKey, err := wgcfg.ParseHexKey(mKeyStr)
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if err != nil {
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log.Printf("Cannot parse machine key: %s", err)
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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.Printf("Cannot decode message: %s", err)
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c.String(http.StatusInternalServerError, "Very sad!")
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return
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}
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2021-05-05 18:59:26 -04:00
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2020-06-21 06:32:08 -04:00
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db, err := h.db()
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if err != nil {
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log.Printf("Cannot open DB: %s", err)
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c.String(http.StatusInternalServerError, ":(")
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return
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}
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defer db.Close()
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var m Machine
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resp := tailcfg.RegisterResponse{}
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if db.First(&m, "machine_key = ?", mKey.HexString()).RecordNotFound() {
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log.Println("New Machine!")
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h.handleNewServer(c, db, mKey, req)
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return
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}
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// We do have the updated key!
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if m.NodeKey == wgcfg.Key(req.NodeKey).HexString() {
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if m.Registered {
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2021-02-23 15:07:52 -05:00
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log.Println("Client is registered and we have the current key. All clear to /map")
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2020-06-21 06:32:08 -04:00
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resp.AuthURL = ""
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2021-02-27 18:58:09 -05:00
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resp.User = *m.Namespace.toUser()
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2021-05-06 17:25:40 -04:00
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resp.MachineAuthorized = true
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2020-06-21 06:32:08 -04:00
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respBody, err := encode(resp, &mKey, h.privateKey)
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if err != nil {
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log.Printf("Cannot encode message: %s", err)
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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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2021-04-24 11:26:50 -04:00
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log.Println("Hey! Not registered. Not asking for key rotation. Send a passive-aggressive authurl to register")
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2020-06-21 06:32:08 -04:00
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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.Printf("Cannot encode message: %s", err)
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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 dont have the updated key in the DB. Lets try with the old one.
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if m.NodeKey == wgcfg.Key(req.OldNodeKey).HexString() {
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log.Println("Key rotation!")
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m.NodeKey = wgcfg.Key(req.NodeKey).HexString()
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db.Save(&m)
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resp.AuthURL = ""
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2021-02-27 18:58:09 -05:00
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resp.User = *m.Namespace.toUser()
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2020-06-21 06:32:08 -04:00
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respBody, err := encode(resp, &mKey, h.privateKey)
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if err != nil {
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log.Printf("Cannot encode message: %s", err)
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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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log.Println("We dont know anything about the new key. WTF")
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2021-05-06 17:49:55 -04:00
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// spew.Dump(req)
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2020-06-21 06:32:08 -04:00
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}
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2021-02-23 15:07:52 -05:00
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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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2020-06-21 06:32:08 -04:00
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func (h *Headscale) PollNetMapHandler(c *gin.Context) {
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2021-02-21 17:54:15 -05:00
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body, _ := io.ReadAll(c.Request.Body)
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2020-06-21 06:32:08 -04:00
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mKeyStr := c.Param("id")
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mKey, err := wgcfg.ParseHexKey(mKeyStr)
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if err != nil {
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log.Printf("Cannot parse client key: %s", err)
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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.Printf("Cannot decode message: %s", err)
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2021-02-23 15:07:52 -05:00
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return
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2020-06-21 06:32:08 -04:00
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}
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db, err := h.db()
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if err != nil {
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log.Printf("Cannot open DB: %s", err)
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return
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}
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2021-02-21 17:54:15 -05:00
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defer db.Close()
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2020-06-21 06:32:08 -04:00
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var m Machine
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if db.First(&m, "machine_key = ?", mKey.HexString()).RecordNotFound() {
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2021-05-14 18:05:41 -04:00
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log.Printf("Cannot fingitd machine: %s", err)
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2020-06-21 06:32:08 -04:00
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return
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}
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hostinfo, _ := json.Marshal(req.Hostinfo)
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2021-02-23 15:07:52 -05:00
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m.Name = req.Hostinfo.Hostname
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2021-05-14 18:05:41 -04:00
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m.HostInfo = datatypes.JSON(hostinfo)
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2021-02-21 15:34:28 -05:00
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m.DiscoKey = wgcfg.Key(req.DiscoKey).HexString()
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2020-06-21 06:32:08 -04:00
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now := time.Now().UTC()
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2021-02-23 15:07:52 -05:00
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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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2021-05-14 18:05:41 -04:00
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m.Endpoints = datatypes.JSON(endpoints)
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2021-02-23 15:07:52 -05:00
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m.LastSeen = &now
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}
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2020-06-21 06:32:08 -04:00
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db.Save(&m)
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2021-02-23 15:07:52 -05:00
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pollData := make(chan []byte, 1)
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update := make(chan []byte, 1)
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cancelKeepAlive := make(chan []byte, 1)
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defer close(pollData)
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defer close(update)
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defer close(cancelKeepAlive)
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h.pollMu.Lock()
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h.clientsPolling[m.ID] = update
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h.pollMu.Unlock()
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2020-06-21 06:32:08 -04:00
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2021-02-23 15:07:52 -05:00
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data, err := h.getMapResponse(mKey, req, m)
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if err != nil {
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c.String(http.StatusInternalServerError, ":(")
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return
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}
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2020-06-21 06:32:08 -04:00
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2021-02-23 15:07:52 -05:00
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log.Printf("[%s] sending initial map", m.Name)
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pollData <- *data
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2020-06-21 06:32:08 -04:00
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2021-02-23 15:07:52 -05:00
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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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if !req.ReadOnly {
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peers, _ := h.getPeers(m)
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h.pollMu.Lock()
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for _, p := range *peers {
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log.Printf("[%s] notifying peer %s (%s)", m.Name, p.Name, p.Addresses[0])
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if pUp, ok := h.clientsPolling[uint64(p.ID)]; ok {
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pUp <- []byte{}
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} else {
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log.Printf("[%s] Peer %s does not appear to be polling", m.Name, p.Name)
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2020-06-21 06:32:08 -04:00
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}
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}
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2021-02-23 15:07:52 -05:00
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h.pollMu.Unlock()
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}
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go h.keepAlive(cancelKeepAlive, pollData, mKey, req, m)
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2020-06-21 06:32:08 -04:00
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c.Stream(func(w io.Writer) bool {
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2021-02-23 15:07:52 -05:00
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select {
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case data := <-pollData:
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log.Printf("[%s] Sending data (%d bytes)", m.Name, len(data))
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2021-04-24 11:41:29 -04:00
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_, err := w.Write(data)
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if err != nil {
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fmt.Printf("[%s] 🤮 Cannot write data: %s", m.Name, err)
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}
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2020-06-21 06:32:08 -04:00
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return true
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2021-02-23 15:07:52 -05:00
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case <-update:
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log.Printf("[%s] Received a request for update", m.Name)
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data, err := h.getMapResponse(mKey, req, m)
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if err != nil {
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fmt.Printf("[%s] 🤮 Cannot get the poll response: %s", m.Name, err)
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}
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2021-04-24 11:41:29 -04:00
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_, err = w.Write(*data)
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if err != nil {
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fmt.Printf("[%s] 🤮 Cannot write the poll response: %s", m.Name, err)
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}
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2021-02-23 15:07:52 -05:00
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return true
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case <-c.Request.Context().Done():
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log.Printf("[%s] 😥 The client has closed the connection", m.Name)
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h.pollMu.Lock()
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cancelKeepAlive <- []byte{}
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delete(h.clientsPolling, m.ID)
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h.pollMu.Unlock()
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2020-06-21 06:32:08 -04:00
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return false
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2021-02-23 15:07:52 -05:00
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2020-06-21 06:32:08 -04:00
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}
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})
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2021-02-23 15:07:52 -05:00
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}
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2020-06-21 06:32:08 -04:00
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2021-02-23 15:07:52 -05:00
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func (h *Headscale) keepAlive(cancel chan []byte, pollData chan []byte, mKey wgcfg.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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2021-05-15 12:12:22 -04:00
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h.pollMu.Lock()
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2021-02-23 15:07:52 -05:00
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data, err := h.getMapKeepAliveResponse(mKey, req, m)
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if err != nil {
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log.Printf("Error generating the keep alive msg: %s", err)
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return
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}
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|
|
|
pollData <- *data
|
2021-05-15 12:12:22 -04:00
|
|
|
h.pollMu.Unlock()
|
2021-02-23 15:07:52 -05:00
|
|
|
time.Sleep(60 * time.Second)
|
|
|
|
|
}
|
|
|
|
|
}
|
2020-06-21 06:32:08 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func (h *Headscale) getMapResponse(mKey wgcfg.Key, req tailcfg.MapRequest, m Machine) (*[]byte, error) {
|
|
|
|
|
node, err := m.toNode()
|
|
|
|
|
if err != nil {
|
|
|
|
|
log.Printf("Cannot convert to node: %s", err)
|
|
|
|
|
return nil, err
|
|
|
|
|
}
|
|
|
|
|
peers, err := h.getPeers(m)
|
|
|
|
|
if err != nil {
|
|
|
|
|
log.Printf("Cannot fetch peers: %s", err)
|
|
|
|
|
return nil, err
|
|
|
|
|
}
|
|
|
|
|
resp := tailcfg.MapResponse{
|
|
|
|
|
KeepAlive: false,
|
|
|
|
|
Node: node,
|
|
|
|
|
Peers: *peers,
|
2021-02-20 16:43:07 -05:00
|
|
|
DNS: []netaddr.IP{},
|
2020-06-21 06:32:08 -04:00
|
|
|
SearchPaths: []string{},
|
|
|
|
|
Domain: "foobar@example.com",
|
|
|
|
|
PacketFilter: tailcfg.FilterAllowAll,
|
2021-02-20 17:57:06 -05:00
|
|
|
DERPMap: h.cfg.DerpMap,
|
2020-06-21 06:32:08 -04:00
|
|
|
UserProfiles: []tailcfg.UserProfile{},
|
2021-02-23 18:31:58 -05:00
|
|
|
Roles: []tailcfg.Role{},
|
|
|
|
|
}
|
2020-06-21 06:32:08 -04:00
|
|
|
|
|
|
|
|
var respBody []byte
|
|
|
|
|
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
|
|
|
|
|
}
|
|
|
|
|
}
|
2021-02-23 15:07:52 -05:00
|
|
|
// spew.Dump(resp)
|
2020-06-21 06:32:08 -04:00
|
|
|
// 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 wgcfg.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) handleNewServer(c *gin.Context, db *gorm.DB, idKey wgcfg.Key, req tailcfg.RegisterRequest) {
|
2021-05-05 18:59:26 -04:00
|
|
|
m := Machine{
|
2020-06-21 06:32:08 -04:00
|
|
|
MachineKey: idKey.HexString(),
|
|
|
|
|
NodeKey: wgcfg.Key(req.NodeKey).HexString(),
|
|
|
|
|
Expiry: &req.Expiry,
|
2021-02-23 15:07:52 -05:00
|
|
|
Name: req.Hostinfo.Hostname,
|
2020-06-21 06:32:08 -04:00
|
|
|
}
|
2021-05-05 18:59:26 -04:00
|
|
|
if err := db.Create(&m).Error; err != nil {
|
2020-06-21 06:32:08 -04:00
|
|
|
log.Printf("Could not create row: %s", err)
|
|
|
|
|
return
|
|
|
|
|
}
|
2021-05-05 18:59:26 -04:00
|
|
|
|
|
|
|
|
resp := tailcfg.RegisterResponse{}
|
|
|
|
|
|
|
|
|
|
if req.Auth.AuthKey != "" {
|
|
|
|
|
pak, err := h.checkKeyValidity(req.Auth.AuthKey)
|
|
|
|
|
if err != nil {
|
|
|
|
|
resp.MachineAuthorized = false
|
|
|
|
|
respBody, err := encode(resp, &idKey, h.privateKey)
|
|
|
|
|
if err != nil {
|
|
|
|
|
log.Printf("Cannot encode message: %s", err)
|
|
|
|
|
c.String(http.StatusInternalServerError, "")
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
c.Data(200, "application/json; charset=utf-8", respBody)
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
ip, err := h.getAvailableIP()
|
|
|
|
|
if err != nil {
|
|
|
|
|
log.Println(err)
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
m.IPAddress = ip.String()
|
|
|
|
|
m.NamespaceID = pak.NamespaceID
|
|
|
|
|
m.AuthKeyID = uint(pak.ID)
|
2021-05-06 12:26:01 -04:00
|
|
|
m.RegisterMethod = "authKey"
|
2021-05-05 18:59:26 -04:00
|
|
|
m.Registered = true
|
|
|
|
|
db.Save(&m)
|
|
|
|
|
|
|
|
|
|
resp.MachineAuthorized = true
|
|
|
|
|
resp.User = *pak.Namespace.toUser()
|
|
|
|
|
respBody, err := encode(resp, &idKey, h.privateKey)
|
|
|
|
|
if err != nil {
|
|
|
|
|
log.Printf("Cannot encode message: %s", err)
|
|
|
|
|
c.String(http.StatusInternalServerError, "Extremely sad!")
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
c.Data(200, "application/json; charset=utf-8", respBody)
|
|
|
|
|
return
|
2020-06-21 06:32:08 -04:00
|
|
|
}
|
|
|
|
|
|
2021-05-05 18:59:26 -04:00
|
|
|
resp.AuthURL = fmt.Sprintf("%s/register?key=%s",
|
|
|
|
|
h.cfg.ServerURL, idKey.HexString())
|
|
|
|
|
|
2020-06-21 06:32:08 -04:00
|
|
|
respBody, err := encode(resp, &idKey, h.privateKey)
|
|
|
|
|
if err != nil {
|
|
|
|
|
log.Printf("Cannot encode message: %s", err)
|
|
|
|
|
c.String(http.StatusInternalServerError, "Extremely sad!")
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
c.Data(200, "application/json; charset=utf-8", respBody)
|
|
|
|
|
}
|
