[SR-Users] Kamailio authentication method

[Mathys Frédéric]

Still on the subject, we are exploring the possibilities and one of them would be to use the diameter module. As stated in the documentation :
"NOTE: diameter support was developed for DISC (DIameter Server Client project at http://developer.berlios.de/projects/disc/). This project seems to be no longer maintained and DIAMETER specifications were updated in the meantime. Thus, the module is obsolete and needs rework to be usable with opendiameter or other DIAMETER servers."
Is it planned to update this module on your side on not?

One other solution would be to write our own module to connect to another server (which contains the users/passwords and calculate the HA1 and HA2 values), tcp layer would still be done by auth module. To do that, is there a spec on how to communicate with auth module? And any documentation on custom module development and deployment? The principle would be more or less the same as diameter, but maybe our server would not use radius nor diameter protocols.

By doing it, we try to reach two goals : use SHA instead of MD5 and increase the security of the user management by hosting it in a different way as Kamailio does.

Thank you,
Frederic

From: sr-users [mailto:sr-users-bounces at lists.sip-router.org] On Behalf Of Daniel-Constantin Mierla
Sent: Wednesday 6 May 2015 16:44
To: Kamailio (SER) - Users Mailing List
Subject: Re: [SR-Users] Kamailio authentication method

Hello,

to understand properly, do you need to have:

HA1=SHA(username:realm:password)
HA2=SHA(method:digestURI)
response=SHA(HA1:nonce:HA2)

Perhaps it can be done with config file scripting, if you are familiar with transformations and header manipulation. But I think it will be simpler to extend auth module to support different hashing algorithm.

The code for computing shaX is already in kamailio (used for shaX transformations), so the change in auth should be about advertising and detecting when the new algorithm has to be used.

Cheers,
Daniel

On 06/05/15 16:28, Mathys Frédéric wrote:
Hello,

In my scenario with a Kamailio server, I have a VOIP client connecting to the server which, for some reasons, cannot calculate MD5 hashes but only SHA. In this situation, would it be possible to change the authentication algorithm by either modifying Kamailio scripts or writing an external module to do that?

As far as I know, the authentication response is calculated as follow (standard HTTP Digest authentication) :

HA1=MD5(username:realm:password)

HA2=MD5(method:digestURI)

response=MD5(HA1:nonce:HA2)

For that, I have to save ha1 and ha1b values in the DB with the SHA function directly (with a trigger for example), and then change the authentication method too.
What is the best solution to do that? Does a module already exists?

Thank you!

Frederic Mathys
System Integration & Validation





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