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Description of problem:

Although the negative cache is checked while processing requests by SIDs it is still not used properly because only a global add function is set in src/responder/common/cache_req/plugins/cache_req_object_by_sid.c but not the add function for individual domains. So if a SID does not exists at all it is added to the negative cache but during a multi-domain search a SID which does not exists in an individual domain is not added to the negative cache of the individual domain.

...
    .global_ncache_add_fn = cache_req_object_by_sid_global_ncache_add,
    .ncache_check_fn = cache_req_object_by_sid_ncache_check,
    .ncache_add_fn = NULL,
    .ncache_filter_fn = NULL,
    .lookup_fn = cache_req_object_by_sid_lookup,
    .dp_send_fn = cache_req_object_by_sid_dp_send,
    .dp_recv_fn = cache_req_common_dp_recv,
    .dp_get_domain_check_fn = NULL,
    .dp_get_domain_send_fn = NULL,
    .dp_get_domain_recv_fn = NULL,
};
...

Additionally, since we already have the *get_domain* check mechanism to go straight to the right domain this should be used for requests by SID as well so that a multi-domain search would only be used as the fallback case.

Upstream PR: https://github.com/SSSD/sssd/pull/6353

Pushed PR: https://github.com/SSSD/sssd/pull/6353

* `master`
    * 5ea1ed27f55508958b21e46a01464f6a3aed11ad - CACHE: implement *get_domain* for SID lookup
    * 70d5460b0d021e14a84371d367edb67262559713 - CACHE: implement ncache_add_fn for ncache SID

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (sssd bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:2514