Re: SecArgumentsLimit Equivalent for XML Processing

I remember that discussion now, thanks.

I am not sure if the developers are actively following the mailing list. So
it's probably best to ask this question on github.

Best,

Christian

On Fri, Dec 24, 2021 at 12:53:47PM +0000, Srikanth Arunachalam via mod-security-users wrote:
> Hi Christian,
> 
> Thanks for getting back to me so quickly. Yes, SecArgumentsLimit is a
> Modsec keyword in V3.
> This allows to restrict the rule apply to quantity specified in
> SecArgumentsLimit.
> 
> We had some performance considerations in the past, when, json payload has
> high depth cardinality of list.
> Rule id 942460 (Metacharacter search on non-alphanumberic characters \W)
> spends lot of time.
> 
> There has also been some discussions on this SecArgumentsLimit on
> https://github.com/SpiderLabs/ModSecurity/pull/2234
> 
> This woks fantastic for JSON based payload. To be more precise, including a
> value of SecArgumentsLimit allows to process partial set of payload, rather
> than the whole file.
> 
> We couldnt apply the same for the XML payload is the concern I have raised
> in this forum.
> 
> Kind Regards
> Srikanth Arunachalam
> 
> On Thu, Dec 23, 2021 at 11:01 PM Christian Folini <
> [email protected]> wrote:
> 
> > Hey Srikanth,
> >
> > I'm not familia with SecArgumentsLimit. Is it a v3 directive?
> >
> > What do you want it to do exactly with your XML payload?
> >
> > Best,
> >
> > Christian Folini
> >
> > On Thu, Dec 23, 2021 at 04:43:56PM +0000, Srikanth Arunachalam via
> > mod-security-users wrote:
> > > Hi
> > >
> > > We have a not very large XML payload (3mb) with tags including
> > > multiple entries separated with comma.
> > >
> > >     When I remove the comma separation the WAF process takes about 14sec
> > to
> > > complete.
> > > When I include the comma separation lists in XML tag, it complex in 29
> > > seconds.
> > >
> > > Had this been a json payload, I would have used SecArgumentsLimit. It has
> > > not been effective in XML.
> > >
> > > Any sooner suggestion/response would be appreciated.
> > >
> > > Kind Regards
> > > Srikanth Arunachalam
> >
> >
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