395 lines
10 KiB
Go
395 lines
10 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/gorm"
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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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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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now := time.Now().UTC()
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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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LastSuccessfulUpdate: &now,
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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 /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("Not registered and not NodeKey rotation. Sending a authurl to register")
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if h.cfg.OIDCIssuer != "" {
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resp.AuthURL = fmt.Sprintf("%s/oidc/register/%s", h.cfg.ServerURL, mKey.HexString())
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} else {
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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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}
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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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if h.cfg.OIDCIssuer != "" {
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resp.AuthURL = fmt.Sprintf("%s/oidc/register/%s", h.cfg.ServerURL, mKey.HexString())
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} else {
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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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}
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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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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(true)
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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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//TODO(kradalby): As per tailscale docs, if DNSConfig is nil,
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// it means its not updated, maybe we can have some logic
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// to check and only pass updates when its updates.
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// This is probably more relevant if we try to implement
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// "MagicDNS"
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DNSConfig: h.cfg.DNSConfig,
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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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log.Trace().
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Str("func", "getMapResponse").
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Str("machine", req.Hostinfo.Hostname).
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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, _ := json.Marshal(resp)
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encoder, _ := zstd.NewWriter(nil)
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srcCompressed := encoder.EncodeAll(src, nil)
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respBody, err = encodeMsg(srcCompressed, &mKey, h.privateKey)
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if err != nil {
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return nil, err
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}
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} else {
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respBody, err = encode(resp, &mKey, 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, 4)
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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(mKey wgkey.Key, req tailcfg.MapRequest, m Machine) (*[]byte, error) {
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resp := 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 req.Compress == "zstd" {
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src, _ := json.Marshal(resp)
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encoder, _ := zstd.NewWriter(nil)
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srcCompressed := encoder.EncodeAll(src, nil)
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respBody, err = encodeMsg(srcCompressed, &mKey, h.privateKey)
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if err != nil {
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return nil, err
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}
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} else {
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respBody, err = encode(resp, &mKey, 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, 4)
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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) handleAuthKey(c *gin.Context, db *gorm.DB, idKey wgkey.Key, req tailcfg.RegisterRequest, m Machine) {
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log.Debug().
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Str("func", "handleAuthKey").
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Str("machine", req.Hostinfo.Hostname).
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Msgf("Processing auth key for %s", req.Hostinfo.Hostname)
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resp := tailcfg.RegisterResponse{}
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pak, err := h.checkKeyValidity(req.Auth.AuthKey)
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if err != nil {
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resp.MachineAuthorized = false
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respBody, err := encode(resp, &idKey, h.privateKey)
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if err != nil {
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log.Error().
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Str("func", "handleAuthKey").
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Str("machine", m.Name).
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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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log.Error().
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Str("func", "handleAuthKey").
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Str("machine", m.Name).
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Msg("Failed authentication via AuthKey")
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return
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}
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log.Debug().
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Str("func", "handleAuthKey").
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Str("machine", m.Name).
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Msg("Authentication key was valid, proceeding to acquire an IP address")
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ip, err := h.getAvailableIP()
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if err != nil {
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log.Error().
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Str("func", "handleAuthKey").
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Str("machine", m.Name).
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Msg("Failed to find an available IP")
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return
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}
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log.Info().
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Str("func", "handleAuthKey").
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Str("machine", m.Name).
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Str("ip", ip.String()).
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Msgf("Assigning %s to %s", ip, m.Name)
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m.AuthKeyID = uint(pak.ID)
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m.IPAddress = ip.String()
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m.NamespaceID = pak.NamespaceID
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m.NodeKey = wgkey.Key(req.NodeKey).HexString() // we update it just in case
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m.Registered = true
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m.RegisterMethod = "authKey"
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db.Save(&m)
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resp.MachineAuthorized = true
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resp.User = *pak.Namespace.toUser()
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respBody, err := encode(resp, &idKey, h.privateKey)
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if err != nil {
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log.Error().
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Str("func", "handleAuthKey").
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Str("machine", m.Name).
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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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log.Info().
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Str("func", "handleAuthKey").
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Str("machine", m.Name).
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Str("ip", ip.String()).
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Msg("Successfully authenticated via AuthKey")
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}
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