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f172dba0e3
A `tests` entry describes one connection attempt to one specific
host on one specific port over a connection-oriented protocol, and
asserts whether it is allowed or denied. Five shape rules follow —
single-port dst, proto in {tcp, udp, sctp, ""}, no
autogroup:internet dst, no CIDR-typed dst (raw `/N` or hosts:-alias
to a multi-host prefix), at least one of accept/deny — and every
one was previously silently accepted by headscale even though
Tailscale SaaS rejects them as "test(s) failed".
Enforce them in one pass over `pol.Tests` from `Policy.validate()`,
reusing the existing parse-time multierr aggregation. The same
shapes remain valid inside ACL or Grant destinations where the rule
does not apply; the validator only walks the tests array.
The compat runner now treats parse-time errors equivalently to
SetPolicy errors so the captured Tailscale body still matches via
substring regardless of which step surfaces the rejection. Nine
divergences resolved by this validation pass drop out of
knownPolicyTesterDivergences.
Updates #1803