Wireshark · Wireshark-dev: Re: [Wireshark-dev] Fixing the problem where Wireshark misdissects the SPNEGO negTokenInit

[Richard Sharpe <realrichardsharpe@xxxxxxxxx>]

On Thu, May 22, 2014 at 12:37 AM, Kukosa, Tomas <tomas.kukosa@xxxxxxxxx> wrote:
> Hi Richard,
>
> I do not know how to decide (and where) whether it is request or response as I have never seen SPNEGO.
>
> But the second half of the problem to switch between NegTokenInit and NegTokenInit2 can be solved in following way:
>
> #.FN_BODY NegotiationToken/negTokenInit
>   gboolean is_response = FALSE;  /* get this information from somewhere */
>   if (is_response) {
>     return dissect_spnego_NegTokenInit2(%(IMPLICIT_TAG)s, %(TVB)s, %(OFFSET)s, %(ACTX)s, %(TREE)s, %(HF_INDEX)s);
>   } else {
>     return dissect_spnego_NegTokenInit(%(IMPLICIT_TAG)s, %(TVB)s, %(OFFSET)s, %(ACTX)s, %(TREE)s, %(HF_INDEX)s);
>   }
> #.END

Thank you for that hint. Also, I have found the pinfo pointer in the actx.

However, is this an issue?

[rsharpe@localhost spnego]$ make
/usr/bin/python ../../tools/asn2wrs.py \
-b \
-p spnego \
-c ./spnego.cnf \
-s ./packet-spnego-template \
-D . \
-O ../../epan/dissectors \
spnego.asn
ASN.1 to Wireshark dissector compiler
:0: UserWarning: The same type names for different types. Explicit
type renaming is recommended.
T_mechListMIC
 T_mechListMIC        NegTokenInit/mechListMIC
 T_mechListMIC_01     NegTokenTarg/mechListMIC

:0: UserWarning: The same field names for different types. Explicit
field renaming is recommended.
mechListMIC
 mechListMIC_01       OCTET_STRING         NegTokenInit2/mechListMIC
 mechListMIC          T_mechListMIC        NegTokenInit/mechListMIC
 mechListMIC_02       T_mechListMIC_01     NegTokenTarg/mechListMIC

:0: UserWarning: The same field names for different types. Explicit
field renaming is recommended.
mechToken
 mechToken_01         OCTET_STRING         NegTokenInit2/mechToken
 mechToken            T_mechToken          NegTokenInit/mechToken

-- 
Regards,
Richard Sharpe
(何以解憂？唯有杜康。--曹操)