API keys, pre-auth keys and OAuth clients/tokens share one table and verify
path. Secrets carry 256 bits of crypto/rand entropy, so a SHA-256 digest
needs no stretching; bcrypt/argon2id rows rehash on use until 0.32.
The upstream tailscale client only runs its OAuth client-credentials exchange
for secrets prefixed tskey-client-, so accept it as an alias for hskey-client-.
The prefix is only a label sliced off before lookup, so the same stored client
authenticates under either; lets the official client and GitHub Action mint auth
keys against headscale.
Add the OAuth client type, its database storage, the scope grant package,
policy tag-ownership exposure, and the state operations backing the v2
OAuth client-credentials flow.
Kristoffer Dalby
Kristoffer Dalby