Unable to get group membership

[Michael Dahlberg]

I'm trying to obtain group membership of accounts that login via SSSD against an AD environment (id_provider = ldap, auth_provider = krb5).  Authentication completes successfully and the UID and GID values are correct for the logged in user account:

uid=1113938(username) gid=1000 groups=1000 context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023

but where there is "context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023" there should be a list of user-managed groups that the user is a member of.  These groups are contained in an Active Directory environment.

A debug log (debug_level = 6) shows the following segment which repeats on and on:

(Mon Apr 27 16:34:16 2020) [sssd[nss]] [nss_getby_id] (0x0400): Input ID: 0
(Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_send] (0x0400): CR #33674: New request 'User by ID'
(Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_select_domains] (0x0400): CR #33674: Performing a multi-domain search
(Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_search_domains] (0x0400): CR #33674: Search will check the cache and check the data provider
(Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_set_domain] (0x0400): CR #33674: Using domain [implicit_files]
(Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_search_send] (0x0400): CR #33674: Looking up UID:0@implicit_files
(Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_search_ncache] (0x0400): CR #33674: Checking negative cache for [UID:0@implicit_files]
(Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_search_ncache] (0x0400): CR #33674: [UID:0@implicit_files] does not exist (negative cache)
(Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_set_domain] (0x0400): CR #33674: Using domain [AD.EXAMPLE.EDU]
(Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_search_send] (0x0400): CR #33674: Looking up UID:[e-mail]
(Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_search_ncache] (0x0400): CR #33674: Checking negative cache for [UID:[e-mail]]
(Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_search_ncache] (0x0400): CR #33674: [UID:[e-mail]] does not exist (negative cache)
(Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_process_result] (0x0400): CR #33674: Finished: Not found

I can query the AD using ldapsearch and get a group membership list, but I can't seem to get that data using SSSD.  What sssd.conf option should I be using to successfully obtain this data?

Thanks,
Mike

[Sumit Bose]

On Mon, Apr 27, 2020 at 09:01:10PM -0000, Michael Dahlberg wrote:
> I'm trying to obtain group membership of accounts that login via SSSD against an AD environment (id_provider = ldap, auth_provider = krb5).  Authentication completes successfully and the UID and GID values are correct for the logged in user account:
>
> uid=1113938(username) gid=1000 groups=1000 context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
>
> but where there is "context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023" there should be a list of user-managed groups that the user is a member of.  These groups are contained in an Active Directory environment.
>
> A debug log (debug_level = 6) shows the following segment which repeats on and on:
>
> (Mon Apr 27 16:34:16 2020) [sssd[nss]] [nss_getby_id] (0x0400): Input ID: 0
> (Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_send] (0x0400): CR #33674: New request 'User by ID'
> (Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_select_domains] (0x0400): CR #33674: Performing a multi-domain search
> (Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_search_domains] (0x0400): CR #33674: Search will check the cache and check the data provider
> (Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_set_domain] (0x0400): CR #33674: Using domain [implicit_files]
> (Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_search_send] (0x0400): CR #33674: Looking up UID:0@implicit_files
> (Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_search_ncache] (0x0400): CR #33674: Checking negative cache for [UID:0@implicit_files]
> (Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_search_ncache] (0x0400): CR #33674: [UID:0@implicit_files] does not exist (negative cache)
> (Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_set_domain] (0x0400): CR #33674: Using domain [AD.EXAMPLE.EDU]
> (Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_search_send] (0x0400): CR #33674: Looking up UID:[e-mail]
> (Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_search_ncache] (0x0400): CR #33674: Checking negative cache for [UID:[e-mail]]
> (Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_search_ncache] (0x0400): CR #33674: [UID:[e-mail]] does not exist (negative cache)
> (Mon Apr 27 16:34:16 2020) [sssd[nss]] [cache_req_process_result] (0x0400): CR #33674: Finished: Not found
>
> I can query the AD using ldapsearch and get a group membership list, but I can't seem to get that data using SSSD.  What sssd.conf option should I be using to successfully obtain this data?

Hi,

the first question would be obviously why you use id_provider=ldap and
not id_provider=ad?

If there is a reason for using id_provider=ldap the next question would
be which group membership scheme you want to use. You can use the same
group memberships AD is using but you can use group-memberships defined
the in the special services-for-unix LDAP attributes (the 'UNIX
Attributes' tab in older versions of AD's 'Users and Computers' tool).

bye,
Sumit
> Thanks,
> Mike
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