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Re: OpenLDAP with ppolicy and SSSD configuration question.
Viviano, Brad wrote:
Adjusting ACL's seems like overkill for this situation and I have to work
within the bounds of what sssd offers. sssd doesn't have a native check for
pwdAccountLockedTime when it does ppolicy based checking, the code just isn't
there. sssd for LDAP auth does support a True/False check for account locked,
which is how Redhat DS, 389ds and IPA do it, from what I've read. I've added a
True/False as a schema extension, tested it and it works. If I manually set
accountLocked to TRUE on a DN, the user can't login at all, it logs in the
messages file the account it locked. Works perfect.
You're still missing the point that if the user didn't provide a password for
LDAP Bind, then LDAP authentication *didn't happen*. If SSSD is still doing an
LDAP authorization check here, that's a *bug*, because without a successful
authentication, it has no way to verify that the provided username matches any
particular LDAP entry. Therefore it cannot assert that any particular LDAP
attribute has any relevance to the current login attempt.
My question is, is there a better way to set that True/False attribute
based on pwdAccountLockedTime. What I am looking for is, if
pwdAccountLockedTime is set for DN=x, then also set accountLocked=true for
DN=x. Sure, I can do that with an external script, but is there a way to do it
from within slapd.
Of course you can write a slapd overlay to do this, but it would be a mistake
because your security mechanism is broken. Anyone with permission to write to
the directory could spoof their username attribute and lockout any user of
SSSD has a lot of issues. This is why we still recommend nssov.
Basically can I create a virtual attribute so when a user queries for
accountLocked, it actually does a check for something else
(pwdAccountLockedTime) and based on that value returns True or False. I'm
thinking in terms of a stored procedure offered on many SQL servers.
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/