Antalya 26.3: address OAuth security audit#1777
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`test_arrowflight_interface` failed with `Token authentication is not configured` after the M-19 split between Basic and Bearer authentication paths. pyarrow's `authenticate_basic_token` performs a `Handshake` with `Basic <base64>`, captures the `authorization` response header, and reuses it verbatim on every subsequent RPC. The middleware unconditionally emitted `Bearer <token>` in `SendingHeaders`, so the client's next call arrived as `Bearer <base64(user:password)>` and was routed through the token-auth path -- which has no processors configured in this test, hence the failure. Echo back the same scheme the client sent: Basic stays on the Basic path, Bearer keeps going through token validation. CI report: https://altinity-build-artifacts.s3.amazonaws.com/json.html?PR=1777&sha=f1a7b011b93262d89f3e02dbff3876c965259f38&name_0=PR&name_1=Integration%20tests%20%28amd_binary%2C%203%2F5%29
test_sql_create_jwt_user_with_processor_pin / _with_claims / _no_pin_uses_auto_discovery asserted on `SHOW CREATE USER` output via the default `TabSeparated` format, which escapes single quotes -- the test then compared an unescaped SQL literal against an escaped one. Switch the three `SHOW CREATE USER` calls to `FORMAT TSVRaw` so the SQL literal makes it through verbatim. test_keycloak_auth/* all failed with `Token authentication is disabled` because the `openid` processor's `<configuration_endpoint>` is HTTP, and H-26 now refuses non-HTTPS URLs returned in the OIDC discovery document (defense in depth against poisoned discovery substituting cloud-metadata or in-cluster targets). The test Keycloak speaks plain HTTP, so wire `keycloak_discovery` in manual trust-chain mode -- exactly the escape hatch the H-26 error message documents -- and update the `test_openid_discovery` docstring accordingly. CI: - https://altinity-build-artifacts.s3.amazonaws.com/json.html?PR=1777&sha=bb1b56b0ad9ec85064ffd52990e8cf0fa403a858&name_0=PR&name_1=Integration%20tests%20%28amd_asan%2C%20db%20disk%2C%20old%20analyzer%2C%203%2F6%29 - https://altinity-build-artifacts.s3.amazonaws.com/json.html?PR=1777&sha=bb1b56b0ad9ec85064ffd52990e8cf0fa403a858&name_0=PR&name_1=Integration%20tests%20%28amd_asan%2C%20db%20disk%2C%20old%20analyzer%2C%202%2F6%29
H-26 unconditionally rejects non-HTTPS URLs returned by an OIDC discovery document. The check is defense in depth (the primary defense is <remote_url_allow_hosts>), but it has no escape hatch for operators who knowingly run their IdP over plain HTTP -- they were forced to abandon `configuration_endpoint` and hand-wire the trust chain. Add a per-processor `<allow_http_discovery_urls>` flag, false by default. When true, the HTTPS scheme check on userinfo_endpoint / introspection_endpoint / jwks_uri is suppressed (the <remote_url_allow_hosts> check still runs), and a warning is logged at processor construction so the gap is visible in operator logs. Revert the keycloak integration test back to using `configuration_endpoint` with the new opt-out, since the test Keycloak speaks HTTP.
L-02 added a cooldown branch in `JWKSClient::getJWKS`: when
`now - last_request_send < refresh_timeout` and no JWKS is cached, throw
"in cooldown after a recent failed fetch" so concurrent waiters do not
re-hammer a failing endpoint. The L-02 change updated `last_request_send`
unconditionally before issuing the HTTP call, so a thrown fetch still
arms the cooldown for subsequent callers.
But `last_request_send` is default-initialized to `time_point{}`, i.e.
the `steady_clock` epoch. On Linux the epoch is roughly system boot time
(and containerized hosts with isolated `CLOCK_MONOTONIC` can have a very
recent epoch), so `now - time_point{}` equals the steady-clock uptime.
When the host uptime is less than `jwks_cache_lifetime` (default 3600s)
the cooldown branch triggers on the very first call -- before any real
fetch has been attempted -- and serves "in cooldown after a recent
failed fetch" on freshly-started CI runners. That is what the
`test_keycloak_auth` flake on the targeted shard shows:
https://altinity-build-artifacts.s3.amazonaws.com/json.html?PR=1777&sha=ec127073b3a4fdb7d1bf3f43978ecbce7173a549&name_0=PR&name_1=Integration%20tests%20%28amd_asan%2C%20targeted%29
Change `last_request_send` to `std::optional<time_point>`; treat
`nullopt` as "no attempt has been made yet" and skip the cooldown check
in that case. Also drop the leftover `high_resolution_clock` in the
write-locked branch (libc++ aliases it to `steady_clock` so it built,
but mixing clock types reads as accidental).
`test_sql_create_jwt_user_with_processor_pin` and `test_sql_create_jwt_user_with_claims` asserted that the rejected response did NOT contain the username. ClickHouse's auth-failure body embeds the username (`Code: 516. DB::Exception: <user>: Authentication failed: password is incorrect, or there is no user with such name. (AUTHENTICATION_FAILED)`), so the assertion tripped on the exact case it was meant to verify. Switch to a positive check on the `AUTHENTICATION_FAILED` marker. CI: https://altinity-build-artifacts.s3.amazonaws.com/json.html?PR=1777&sha=495a8cf5f3052eb33a760169cb81bb2b5770d25c&name_0=PR&name_1=Integration%20tests%20%28amd_asan%2C%20targeted%29
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Address OAuth security audit
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