[Serusers] account + IP binding

[Jan Janak]

No, but I have this on my todo list. Currently it is possible to re-use
credentials generated by user agent A also by user agent B provided that
it can sniff the SIP messages and it is fast enough to send another
message including the sniffed credentials. The credentials have limited
lifetime (1 minute by default) so after 1 minute they cannot be re-used
in other SIP messages.

If you have two user agents connected to the same hub (so that they can
see SIP messages of each other) then you can modify one of them to steal
the calls to the other user agent using sniffed digest credentials.

I am thinking about including the source IP address of the SIP message
and some other header fields (Contact) into nonce to eliminate this
weakness.

  Jan.

On 28-07 15:00, zolia at z1sys.com wrote:
> hello,
> 
> is it possible to do source ip authentication besides normal
> www_authorize() for every user account?. This, as i understand, should
> prevent from intercepting credentials and later faking sip message to
> bypass www_authorization ? Or maybe there are some other counter measures
> against such fraud?
> 
> Does src_ip comes directly from ip layer? If so, i could probably use this
> to check with some external database (ie. ser subscriber)?
> 
> Antanas
> NTT
> 
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