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Simplify control flow in RegistrationHandler

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This commits tries to dismantle the complicated "if and or" in the
RegistrationHandler by factoring out the "is Registrated" into a root
if.

This, together with some new comments, should hopefully make it a bit
easier to follow what is happening in all the different cases that needs
to be handled when a Node contacts the registration endpoint.
This commit is contained in:
Kristoffer Dalby 2021-11-21 13:59:24 +00:00
parent 8ccc51ae57
commit c4ecc4db91
1 changed files with 41 additions and 32 deletions
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73
api.go
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@ -116,41 +116,51 @@ func (h *Headscale) RegistrationHandler(ctx *gin.Context) {
machine = &newMachine
}
if !machine.Registered && req.Auth.AuthKey != "" {
if machine.Registered {
// If the NodeKey stored in headscale is the same as the key presented in a registration
// request, then we have a node that is either:
// - Trying to log out (sending a expiry in the past)
// - A valid, registered machine, looking for the node map
// - Expired machine wanting to reauthenticate
if machine.NodeKey == wgkey.Key(req.NodeKey).HexString() {
// The client sends an Expiry in the past if the client is requesting to expire the key (aka logout)
// https://github.com/tailscale/tailscale/blob/main/tailcfg/tailcfg.go#L648
if !req.Expiry.IsZero() && req.Expiry.UTC().Before(now) {
h.handleMachineLogOut(ctx, machineKey, req, *machine)
return
}
// If machine is not expired, and is register, we have a already accepted this machine,
// let it proceed with a valid registration
if !machine.isExpired() {
h.handleMachineValidRegistration(ctx, machineKey, *machine)
return
}
// The machine has expired
h.handleMachineExpired(ctx, machineKey, req, *machine)
return
}
// The NodeKey we have matches OldNodeKey, which means this is a refresh after a key expiration
if machine.NodeKey == wgkey.Key(req.OldNodeKey).HexString() &&
!machine.isExpired() {
h.handleMachineRefreshKey(ctx, machineKey, req, *machine)
return
}
}
// If the machine has AuthKey set, handle registration via PreAuthKeys
if req.Auth.AuthKey != "" {
h.handleAuthKey(ctx, machineKey, req, *machine)
return
}
// We have the updated key!
if machine.NodeKey == wgkey.Key(req.NodeKey).HexString() {
// The client sends an Expiry in the past if the client is requesting to expire the key (aka logout)
// https://github.com/tailscale/tailscale/blob/main/tailcfg/tailcfg.go#L648
if !req.Expiry.IsZero() && req.Expiry.UTC().Before(now) {
h.handleMachineLogOut(ctx, machineKey, req, *machine)
return
}
if machine.Registered && !machine.isExpired() {
h.handleMachineValidRegistration(ctx, machineKey, *machine)
return
}
h.handleMachineExpired(ctx, machineKey, req, *machine)
return
}
// The NodeKey we have matches OldNodeKey, which means this is a refresh after a key expiration
if machine.NodeKey == wgkey.Key(req.OldNodeKey).HexString() &&
!machine.isExpired() {
h.handleMachineRefreshKey(ctx, machineKey, req, *machine)
return
}
h.handleMachineRegistrationNew(ctx, machineKey, req, *machine)
}
@ -286,8 +296,7 @@ func (h *Headscale) handleMachineLogOut(
Str("machine", machine.Name).
Msg("Client requested logout")
machine.Expiry = &reqisterRequest.Expiry // save the expiry so that the machine is marked as expired
h.db.Save(&machine)
h.ExpireMachine(&machine)
resp.AuthURL = ""
resp.MachineAuthorized = false