LDAP Contextless Anonymous Binds

We have been using ldap contextless login for several years. We are
currently setting up Cisco ACS ldap authentication and realized that we
were able to do anonymous bind queries.

Looking at our current Novell ldap setup, I noticed that on the
restrictions tab of the the ldap server there is an option for bind
restrictions. When set to disallow anonymous simple binds we get an
erroneous error that no ldap server was setup.

Our current ldap setup is public has inheritable browse on the cn
attribute. 

Should non-authenticated users be able to query ldap?


-- 
wex005
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0
wex005
11/16/2009 1:26:01 AM
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wex005 wrote:

> Should non-authenticated users be able to query ldap?

But that's the point of anonymous bind ...


-- 


Peter
eDirectory Rules!
http://www.DreamLAN.com
0
Peter
11/16/2009 2:44:32 AM
Peter;1889341 Wrote: 
> wex005 wrote:
> 
> > Should non-authenticated users be able to query ldap?
> 
> But that's the point of anonymous bind ...
> 
> 
> --
> 
> 
> Peter
> eDirectory Rules!
> 'DreamLAN Network Consulting Ltd. - Leading Authority on eDirectory and
> LDAP technologies' (http://www.DreamLAN.com)

Forgive my ignorance and please help me understand. Isn't this a
security concern?

What are the best practices for ldap contextless login? Public or Proxy
user?


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wex005
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0
wex005
11/16/2009 11:56:01 AM
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This may be a good time to define exactly what those two terms mean in
various contexts.  First, [Public] is a trustee in eDirectory that is used
for rights to anonymous (users who have not gone through a bind to
eDirectory) users.  If you do not have a proxy user setup for your LDAP
stuff then [Public] rights are used which include any rights explicitly
granted to [Public] via eDirectory trustees as well as any rights granted
through schema definitions.  This includes the ability to see the UID
attribute on objects, browse the tree, etc. (in a default tree).

As an alternative you can set the LDAP interface to use the rights not of
[Public] but of an LDAP Proxy User.  The binds that take advantage of this
user's rights are still anonymous but instead of default [Public] rights
you can explicitly grant additional rights via this Proxy User object.  To
be clear there is still no authentication so anybody with access to the
socket of the LDAP machine, regardless of credentials they may otherwise
have, can see anything this Proxy User can (that's why it's called a Proxy
User).

On the other hand you can configure different types of LDAP clients to
bind with a real username/password and then they use their own rights to
peruse the tree.  This completely bypasses the rights that [Public] or the
Proxy User have even though the user used to bind to eDirectory is, in
effect, a proxy user but not in the sense that the eDirectory
documentation talks about.  This user must be setup on every LDAP client
that needs to bind as that user (vs. being setup on the server(s)) so it
may take more work but it also means that the rights granted are not
granted to anybody who happens to be able to reach the server.

So which one is best?  Depends on your requirements.  If you do not want
the public to browse the tree then put things in place (start with
firewalls typically) to prevent it.  If you do, then you're already where
you need to be.

Good luck.





wex005 wrote:
> Peter;1889341 Wrote: 
>> wex005 wrote:
>>
>>> Should non-authenticated users be able to query ldap?
>> But that's the point of anonymous bind ...
>>
>>
>> --
>>
>>
>> Peter
>> eDirectory Rules!
>> 'DreamLAN Network Consulting Ltd. - Leading Authority on eDirectory and
>> LDAP technologies' (http://www.DreamLAN.com)
> 
> Forgive my ignorance and please help me understand. Isn't this a
> security concern?
> 
> What are the best practices for ldap contextless login? Public or Proxy
> user?
> 
> 
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0
ab
11/16/2009 1:18:56 PM
Thank you for the clarification.


-- 
wex005
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0
wex005
11/16/2009 2:46:02 PM
Reply:

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