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Handle client sending new NodeKey (fixes #32)

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Juan Font Alonso 2021-06-05 12:13:55 +02:00
parent 0fcd92fcce
commit d4c2870d7e
1 changed files with 74 additions and 58 deletions
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100
api.go
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@ -81,51 +81,65 @@ func (h *Headscale) RegistrationHandler(c *gin.Context) {
return
}
defer db.Close()
var m Machine
resp := tailcfg.RegisterResponse{}
var m Machine
if db.First(&m, "machine_key = ?", mKey.HexString()).RecordNotFound() {
log.Println("New Machine!")
h.handleNewServer(c, db, mKey, req)
m = Machine{
Expiry: &req.Expiry,
MachineKey: mKey.HexString(),
Name: req.Hostinfo.Hostname,
NodeKey: wgcfg.Key(req.NodeKey).HexString(),
}
if err := db.Create(&m).Error; err != nil {
log.Printf("Could not create row: %s", err)
return
}
}
if !m.Registered && req.Auth.AuthKey != "" {
h.handleAuthKey(c, db, mKey, req, m)
return
}
// We do have the updated key!
resp := tailcfg.RegisterResponse{}
// We have the updated key!
if m.NodeKey == wgcfg.Key(req.NodeKey).HexString() {
if m.Registered {
log.Printf("[%s] Client is registered and we have the current key. All clear to /map\n", m.Name)
log.Printf("[%s] Client is registered and we have the current NodeKey. All clear to /map", m.Name)
resp.AuthURL = ""
resp.User = *m.Namespace.toUser()
resp.MachineAuthorized = true
resp.User = *m.Namespace.toUser()
respBody, err := encode(resp, &mKey, h.privateKey)
if err != nil {
log.Printf("Cannot encode message: %s", err)
c.String(http.StatusInternalServerError, "Extremely sad!")
c.String(http.StatusInternalServerError, "")
return
}
c.Data(200, "application/json; charset=utf-8", respBody)
return
}
log.Println("Hey! Not registered. Not asking for key rotation. Send a passive-aggressive authurl to register")
log.Printf("[%s] Not registered and not NodeKey rotation. Sending a authurl to register", m.Name)
resp.AuthURL = fmt.Sprintf("%s/register?key=%s",
h.cfg.ServerURL, mKey.HexString())
respBody, err := encode(resp, &mKey, h.privateKey)
if err != nil {
log.Printf("Cannot encode message: %s", err)
c.String(http.StatusInternalServerError, "Extremely sad!")
c.String(http.StatusInternalServerError, "")
return
}
c.Data(200, "application/json; charset=utf-8", respBody)
return
}
// We dont have the updated key in the DB. Lets try with the old one.
// The NodeKey we have matches OldNodeKey, which means this is a refresh after an key expiration
if m.NodeKey == wgcfg.Key(req.OldNodeKey).HexString() {
log.Println("Key rotation!")
log.Printf("[%s] We have the NodeKey in the database. This is a key refresh", m.Name)
m.NodeKey = wgcfg.Key(req.NodeKey).HexString()
db.Save(&m)
resp.AuthURL = ""
resp.User = *m.Namespace.toUser()
respBody, err := encode(resp, &mKey, h.privateKey)
@ -138,8 +152,32 @@ func (h *Headscale) RegistrationHandler(c *gin.Context) {
return
}
log.Println("We dont know anything about the new key. WTF")
// spew.Dump(req)
// We arrive here after a client is restarted without finalizing the authentication flow or
// when headscale is stopped in the middle of the auth process.
if m.Registered {
log.Printf("[%s] The node is sending us a new NodeKey, but machine is registered. All clear for /map", m.Name)
resp.AuthURL = ""
resp.MachineAuthorized = true
resp.User = *m.Namespace.toUser()
respBody, err := encode(resp, &mKey, 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
}
log.Printf("[%s] The node is sending us a new NodeKey, sending auth url", m.Name)
resp.AuthURL = fmt.Sprintf("%s/register?key=%s",
h.cfg.ServerURL, mKey.HexString())
respBody, err := encode(resp, &mKey, 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)
}
// PollNetMapHandler takes care of /machine/:id/map
@ -390,21 +428,8 @@ func (h *Headscale) getMapKeepAliveResponse(mKey wgcfg.Key, req tailcfg.MapReque
return &data, nil
}
func (h *Headscale) handleNewServer(c *gin.Context, db *gorm.DB, idKey wgcfg.Key, req tailcfg.RegisterRequest) {
m := Machine{
MachineKey: idKey.HexString(),
NodeKey: wgcfg.Key(req.NodeKey).HexString(),
Expiry: &req.Expiry,
Name: req.Hostinfo.Hostname,
}
if err := db.Create(&m).Error; err != nil {
log.Printf("Could not create row: %s", err)
return
}
func (h *Headscale) handleAuthKey(c *gin.Context, db *gorm.DB, idKey wgcfg.Key, req tailcfg.RegisterRequest, m Machine) {
resp := tailcfg.RegisterResponse{}
if req.Auth.AuthKey != "" {
pak, err := h.checkKeyValidity(req.Auth.AuthKey)
if err != nil {
resp.MachineAuthorized = false
@ -415,6 +440,7 @@ func (h *Headscale) handleNewServer(c *gin.Context, db *gorm.DB, idKey wgcfg.Key
return
}
c.Data(200, "application/json; charset=utf-8", respBody)
log.Printf("[%s] Failed authentication via AuthKey", m.Name)
return
}
ip, err := h.getAvailableIP()
@ -423,11 +449,12 @@ func (h *Headscale) handleNewServer(c *gin.Context, db *gorm.DB, idKey wgcfg.Key
return
}
m.AuthKeyID = uint(pak.ID)
m.IPAddress = ip.String()
m.NamespaceID = pak.NamespaceID
m.AuthKeyID = uint(pak.ID)
m.RegisterMethod = "authKey"
m.NodeKey = wgcfg.Key(req.NodeKey).HexString() // we update it just in case
m.Registered = true
m.RegisterMethod = "authKey"
db.Save(&m)
resp.MachineAuthorized = true
@ -439,17 +466,6 @@ func (h *Headscale) handleNewServer(c *gin.Context, db *gorm.DB, idKey wgcfg.Key
return
}
c.Data(200, "application/json; charset=utf-8", respBody)
log.Printf("[%s] Successfully authenticated via AuthKey", m.Name)
return
}
resp.AuthURL = fmt.Sprintf("%s/register?key=%s",
h.cfg.ServerURL, idKey.HexString())
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)
}