Re: [gentoo-server] Extract usernames from Active Directory

[Brian Kroth <bpkroth@gmail.com>]

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Pandu Poluan <pandu@poluan.info> 2011-06-29 09:00:
> -original message-
> Subject: Re: [gentoo-server] Extract usernames from Active Directory
> From: mRyOuNg <mryoung@soundbomb.net>
> Date: 2011-06-29 04:44
>
>> What about an easy ldap request selecting only samaccountname?
>
> Yup, that's the plan. How do I do that?

ldapsearch -h your-ad-dc.your.domain -b 

Something like this:
# ldapsearch -Z -W -x -H ldap://your-ad-dc.your.domain -b ou=Users,dc=your,dc=domain -D cn=$USER,ou=Users,dc=your,dc=domain cn=$USER samaccountname

pipe through some grep | sed to get just the user names.

The catch is that by default AD won't allow anonymous binds, so you need 
to authenticate to the server to perform the ldapsearch (-D, -W).  To do 
that you usually need to use a secure connection (-Z).  Obviously for 
automated things you should use a service account.  -b tells your search 
where to start looking.  cn=$USER is what to look for (called the search 
filter).  samaccountname is what to return (just a list of attribute 
names, or nothing to return them all).  

I don't recall what it's called exactly atm as I try not to touch 
Windows anymore, but if you dig through mmc on a server machine you 
should be able to find something called adsiedit, or some such, that 
will allow you to browse the actual ldap schema and tree.  That'll help 
inform you what the parameters for each of the above settings should 
actually be in your case.

This is just a simple example.  You can get really fancy with ldap 
search filters or hooking all your stuff up to it through pam for local 
auth.  I'd suggest you use a recent windows server version for that as 
the schema bits necessary to serve unix details seem to be a little bit 
more sane these days.

Hope that helps,
Brian

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