test(contract): add the §10.1 rule-8 guardrail regression tests - #15
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CONTRACT.md §10.1 rule 8 — "subject of the decision" — was the one part of the local-verification set with no regression test outside PHP, TypeScript and Python. §15.1 hand-verified that every guard rejects correctly, so this closes a missing guardrail rather than a live defect. Rules 1-7 ask whether the token is good. Rule 8 asks whether it is the token the decision is even about. SEC-085 satisfied all seven and was still an authentication bypass: the PHP guard routed a failed verification into a second, successful one against the application's own session, admitting the caller as the app's service account. Each test asserts its precondition rather than assuming it: a second, fully valid credential for a more privileged principal is first shown to pass the same guard, so a fallback would genuinely have succeeded. Without that, the tests would pass merely because nothing was available to substitute — the trap the PHP reference test documents at length. Every test was falsified by injecting the SEC-085 fallback into the guard and confirming it fails. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01SkTHvZQMV47t3UwkEtmB1D
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Adds the CONTRACT.md §10.1 rule-8 guardrail regression tests — the one part of the local-verification set with no test outside PHP, TypeScript and Python.
The rule
Rules 1-7 ask whether the token is good. Rule 8 asks whether it is the token the decision is even about. SEC-085 satisfied all seven and was still an authentication bypass: the PHP guard routed a failed verification into a second, successful one against the application's own session, admitting the caller as the app's service account.
Why this SDK matters more than the ones handed a bare verifier
The C guard takes an
axiam_client_t *, which carries its own session state —authenticated, the CSRF token, the resolved tenant/org. That is the same structural shape SEC-085 exploited: a stateful client reachable from the guard. It is correct today (it verifies the token pulled from the request headers and nothing else), but nothing pinned that.Tests (4)
rule8_failed_caller_token_rejected_with_live_client_session— publishes the app's key and asserts the precondition that its admin-roled token really does pass this guard, so a fallback would have succeeded. The caller's unverifiable credential must still be refused.rule8_an_expired_caller_token_is_not_swapped_for_a_valid_one— sharper: this token's own key is the published one, so its signature is genuinely valid and it fails onexpalone. Nothing but the caller's own expiry can be the reason for the refusal.rule8_authz_check_carries_the_callers_subject_not_the_apps— the consequence that made SEC-085 a bypass: the authorization check ran for the wrong subject. Asserts the propagatedsubject_idis the caller's and that no app principal appears.rule8_rejection_performs_no_authz_check_at_all— had a fallback substituted another credential, a check would have been issued; an empty recorded body is the evidence none was.Falsified: injecting the SEC-085 fallback into
verify_and_claimsfails test 1 (Expected 401 Was 200).Verified locally:
test_guard— 17 tests, 0 failures.🤖 Generated with Claude Code
https://claude.ai/code/session_01SkTHvZQMV47t3UwkEtmB1D
Generated by Claude Code