Wireshark-dev: Re: [Wireshark-dev] Question regarding decryption of ikev1 ISAKMP messages
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From: Jaap Keuter <jaap.keuter@xxxxxxxxx>
Date: Sun, 02 Sep 2012 14:16:16 +0200
Hi,

Did this happen? What's the bug number?

Thanks
Jaap

On 07/23/2012 04:43 PM, Alexis La Goutte wrote:

Hi,

It is better to create a bug in bugtracker ( https://bugs.wireshark.org ) to no
forget your problem...

Regards,

On Thu, Jun 28, 2012 at 5:51 PM, Susanne Goldammer <Susanne.Goldammer@xxxxxx
<mailto:Susanne.Goldammer@xxxxxx>> wrote:

    Hi all,

    today i was trying to use this feature to decrypt IKEv1 messages
    exchanged during Main Mode. Herefor i added the Initiator Cookie and the
    Encryption Key to the IKEv1 Decryption Table. Unfortunately this did not
    help. I used Wireshark version 1.8.0.

    A source code analysis then showed up, that the code is checking whether
    the connection is using Authentication-Method: PSK. In my case it does
    not use a PSK but RSA-SIG method. So i changed the code

    epan/dissectors/packet-isakmp.c:1728

    if (!decr ||
         decr->is_psk == FALSE || <-- removed this line
         decr->gi_len == 0 ||
         decr->gr_len == 0)
       return NULL;

    and deactivated the line checking for is_psk.
    Then it was possible to decode the ISAKMP payload (Encrypted data). So
    the code seems to work for non PSK connections, too.

    Now i was wondering about the reason for this check. Is it possible to
    remove this for future versions to make the IKEv1 decryption work for
    non PSK connections?

    Thanks a lot for your replies.
    Susanne