Re: How to specify number of hashing iterations for a password

[Rich Megginson <rmeggins@xxxxxxxxxx>]

On 01/15/2014 11:51 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?

Well, actually, yes - don't use passwords - use client certificate based authentication . . .

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?

Thank you - Richard

On Wed, Jan 15, 2014 at 11:25 AM, Rich Megginson <rmeggins@xxxxxxxxxx> 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

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Richard Mixon
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Microsoft Partner ID: 1263725 
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