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  1. RHEL
  2. RHEL-56352

Disable shadow-utils/SSSD integration by default

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    • rhel-9.5.z
    • rhel-9.5
    • shadow-utils
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    • shadow-utils-4.9-10.el9_5
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    • sst_idm_sssd
    • ssg_idm
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    • Bug Fix
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      .Integration between `shadow-utils` and `sss_cache` for local user caching is disabled

      In RHEL 9, the SSSD implicit `files` provider domain, which retrieves user information from local files such as `/etc/shadow` and group information from `/etc/groups`, was disabled by default. However, the integration in `shadow-utils` was not fully disabled, which resulted in calls to `sss_cache` when adding or deleting local users. The unnecessary cache updates caused performance issues for some users. With this update, the `shadow-utils` integration with `sss_cache` is fully disabled, and the performance issues caused by unnecessary cache updates no longer occur.
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      .Integration between `shadow-utils` and `sss_cache` for local user caching is disabled In RHEL 9, the SSSD implicit `files` provider domain, which retrieves user information from local files such as `/etc/shadow` and group information from `/etc/groups`, was disabled by default. However, the integration in `shadow-utils` was not fully disabled, which resulted in calls to `sss_cache` when adding or deleting local users. The unnecessary cache updates caused performance issues for some users. With this update, the `shadow-utils` integration with `sss_cache` is fully disabled, and the performance issues caused by unnecessary cache updates no longer occur.
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      Since SSSD doesn't enable 'files provider' by default on RHEL9, existing integration (user add/del calling 'sss_cache' for every local user operation) does more harm than good.

       

      The proposal is to have RHEL9 specific downstream patch to change

      https://github.com/shadow-maint/shadow/blob/5c0b99c77e3963cc3d4ee4980b0bb3c9955c032c/lib/sssd.c#L29

      to point to a not-existing-by-default script (for example: '/usr/sbin/sss_cache_shadow_utils' )

      This would make `sssd_flush_cache()` a no-op in default install.

      For a (very) unlikely case where user intentionally configures/enabled SSSD 'files provider' and really needs thisintegration, they could create a link
      '/usr/sbin/sss_cache_shadow_utils' pointing to 'sss_cache' to get the functionality back. This should be documented in RNs.

            ipedrosa@redhat.com Iker Pedrosa
            atikhono@redhat.com Alexey Tikhonov
            Iker Pedrosa Iker Pedrosa
            Anuj Borah Anuj Borah
            Dominika Borges Dominika Borges
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              Created:
              Updated: