On 01/15/2014 10:51 AM, Richard Mixon wrote:
Nathan/Rich,
Thank you both for the responses.
We are using the 389 Directory Server for a pretty isolated situation -
authentication/authorization for external users on an "extranet" type
portal website (it integrates pieces of several different web applications).
We don't really envision (famous last words, I know) using it on a
broader basis.
Rich, I can understand why the pre-hashed passwords cause a lot of
integration points to break. Is there a good alternative that still
makes cracking your passwords prohibitively expensive?
Nathan, I have a background in C, but do mostly Java these days. I will
take a look at ticket 397 and get back to you if it's something I could
work on. Can you provide me the pointers you were referring to?
You can take a look at the existing password storage scheme plugin code:
https://git.fedorahosted.org/cgit/389/ds.git/tree/ldap/servers/plugins/pw...
Each storage scheme needs a set of comparison and encoding functions.
The comparison is used to validate a password during a bind operation,
and the encoding function is used when a password is set. You then
register these functions in pwd_init.c, which is where you can map the
storage scheme prefix with the callbacks.
The actual hashing would be done by calling into NSS from the new
functions.
Thank you - Richard
On Wed, Jan 15, 2014 at 11:25 AM, Rich Megginson <rmeggins(a)redhat.com
<mailto:rmeggins@redhat.com>> wrote:
On 01/15/2014 10:38 AM, Richard Mixon wrote:
> During the bind process is there anyway to tell 389 directory
> server to hash a plaintext password n (multiple) times before
> trying to compare to what is stored?
>
> I am trying to implement something similar to what's described in
> this article:
>
http://www.stormpath.com/blog/strong-password-hashing-apache-shiro
>
> Our plan was to to use SSHA256 to hash the passwords around
> 200,000 times before storing. This would at least slow down any
> cracking attempts should someone get access to our directory.
>
> I've read through the documentation on the Red Hat Directory
> Server site, including the "Plug-in Guide". Under "5.8 Checking
> Passwords" it refers to calling function "slapi_pw_find_sv()" -
> looking at the doc for this function it does not look like hashing
> multiple times is supported.
>
> Is there some means of doing this that is not obvious to me?
No.
>
> I can certainly do it by re-writing the security plugins for the
> various servers (Tomcat, PHP Wordpress, etc) such that they hash
> the plaintext password n minus 1 times before issuing the bind -
> but was hoping not to do that.
Use of pre-hashed passwords is strongly discouraged and will break
things like sasl and replication.
Does this have anything to do with
https://fedorahosted.org/389/ticket/397?
>
> I'm relatively new to 389 directory server, but so far quite happy
> to have moved to it from another directory server.
>
> Thank you - Richard
>
> --
> Richard Mixon
> Custom Computer Creations, L.L.C.
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> <mailto:rnmixon@CustCo.biz <mailto:rnmixon@CustCo.biz>>
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Richard Mixon
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email: rnmixon(a)CustCo.biz <mailto:rnmixon@CustCo.biz
<mailto:rnmixon@CustCo.biz>>
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