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SSSD / sssd

A daemon to manage identity, authentication and authorization for centrally-managed systems.
https://sssd.io
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ad_access_filter doesn't like parenthesis in security group CN #6673

Open desparatesysadmin opened 1 year ago

desparatesysadmin commented 1 year ago

So when defining ad_accessfilter, if the security group name have a parenthesis - Administrative Accounts (a)_ -, SSSD fails to apply the filter with the following error messages. 

(2023-04-12 22:34:43): [be[domain.org]] [sdap_get_generic_ext_step] (0x0080): ldap_search_ext failed: Bad search filter
(2023-04-12 22:34:43): [be[domain.org]] [generic_ext_search_handler] (0x0040): sdap_get_generic_ext_recv failed [1432158245]: Malformed search filter

A lot of forums and instructions suggest to verify your filter by using ldapsearch command with the ldap filter shown in the log. ldapsearch and aduc advanced/custom search are able to get successful results using the ldap filter from the log.

filter showing in sssd log (2023-04-12 22:34:43): [be[domain.org]] [sdap_get_generic_ext_step] (0x0400): calling ldap_search_ext with [(&(sAMAccountName=useracc)(objectclass=user)(memberOf=CN=Administrative Accounts (a),OU=_Admin Accounts,DC=domain,DC=org))][CN=User Account (a),OU=_Admin Accounts,DC=domain,DC=org].

SOLUTION: Escaping parenthesis for CN's.

Working configuration

access_provider = ad
ad_access_filter =domain.org:(memberOf=CN=Administrative Accounts \28a\29,OU=_Admin Accounts,DC=domain,DC=org)

Non working configuration

access_provider = ad
ad_access_filter =domain.org:(memberOf=CN=Administrative Accounts (a),OU=_Admin Accounts,DC=domain,DC=org)

I've spent weeks trying to get to the bottom of it and hopefully this helps someone.

andreboscatto commented 11 months ago

@desparatesysadmin thanks for digging it further and sharing. We will work on that to include into the documentation.

alexey-tikhonov commented 11 months ago

There is a note in man sss-certmap

           Please note that the characters "^.[$()|*+?{\" have a special meaning in regular expressions and must be escaped with the help of the '\' character so that they are matched as ordinary characters.

-- would be good to have similar note in 'sssd-ldap' man page.

desparatesysadmin commented 11 months ago

so I am sure the \ followed by the special character didn't work for me either. Had to specifically use the UTF encoding. But will have to retest this to confirm since its been a while now.