1. group lookups are inaccurate for groups with > 1500 members. Once that condition hits, is it inaccurate for all memberships of all groups, or only the specific groups with > 1500 members?
2. Are you using tokengroups? Or does this happen whether or not you use tokengroups?
On Mon, Sep 07, 2020 at 05:57:13PM +0100, R Davies wrote:
>Hi,
>
>When enumeration is enabled (required due to legacy application), and where
>a group has > 1500 members, and AD's MaxValRange is at the default 1500,
>then sssd fails to show more than 1500 group members. Group lookups are no
>longer accurate.
>
>A further interesting aspect is that if the sssd cache is expired (sssctl
>cache-expiry -E), then the correct group membership is shown until such
>time as enumeration is processed again (i.e. at most
>ldap_enumeration_refresh_timeout + memcache_timeout)
>
>src/providers/ldap/sdap.c's sdap_parse_entry() states:
>
>/* This attribute contained range values and needs more to
>> * be retrieved
>> */
>> /* TODO: return the set of attributes that need additional retrieval
>> * For now, we'll continue below and treat it as regular values.
>> */
>
>
>As enumeration is enabled the subsequent ASQ/deref work is never
>undertaken. As such sssd only ever processes the initial range retrieved
>members (0-1499) (NB that nested groups members are evaluated).
Hi,
there is a fair change that the range handling is missing in a code-path
used by enumeration. Please open a ticket at
https://github.com/SSSD/sssd/issues/new for further investigations.
bye,
Sumit
>
>We have looked at the relevant source code, but can't find a way to trigger
>Attribute Scope Queries (ASQ)/deref. Indeed, no manner of sssd
>configuration settings (other than disabling enumeration - which we sadly
>cannot do) appears to change this behaviour. Increasing MaxValRange on AD
>defeats the purpose of having MaxValRange.
>
>Has anyone run into this before? Or, should I raise a new issue?
>
>Many Thanks.
>
>R.
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