[Oisf-users] Suricata - Reject in one-arm IPS/IDS mode

Thu Apr 2 07:00:13 UTC 2015

Hi Pavel,

I'm very interested in what you're able to find out.  I've been testing
out-of-band rejects on and off for the past couple months and can't get
satisfactory results. I'll be sure to post back if I find anything.

HTTP/HTTPs and SSH have been the main communications I've been trying to
break.  There's obvious connection slow down in the browser for loading
pages but they do eventually work. The browser is persistent!  SSH fails a
little easier but not reliably. Sometimes it'll fail within a few seconds
of the connection and other times it's 5/10/30 minutes before it gets
disconnected or not at all.  I do see the suricata events being triggered.

Thanks,
Brian

On Thu, Apr 2, 2015 at 3:46 AM, Rovnov Pavel <provnov at solidex.by> wrote:

> Hello Brian,
>
>
>
> 1)      I'm in planning phase at the moment. I didn't come to testing
> yet.
>
>
>
> But as far as I understand reject must be fast enough to interrupt
> communication with valid sequence numbers for this mechanism to work. If
> it's not so fast you can see that some data "leaks" to the protected asset
> (whatever you are protecting server or user).
>
>
>
> 2)      I'm interested whether we can break communication that matches
> the rule and give a sort of message to the user? The scenario is a user
> browsing wrong web page (http or https) and sensor (suricata) out-of-band.
>
>
>
> Pavel
>
>
>
> *From:* Brian Hennigar [mailto:bhennigar at gmail.com]
> *Sent:* Thursday, April 02, 2015 5:52 AM
> *To:* Rovnov Pavel
> *Cc:* Victor Julien; oisf-users at lists.openinfosecfoundation.org
>
> *Subject:* Re: [Oisf-users] Suricata - Reject in one-arm IPS/IDS mode
>
>
>
> Did you have any success with libnet for rejects?
>
> I've been trying to get it working and the results haven't been promising.
> Occasionally the connection will break on a reject rule but never fast
> enough.
>
>
>
> On Fri, Mar 27, 2015 at 11:21 AM, Rovnov Pavel <provnov at solidex.by> wrote:
>
> Victor,
>
> Thanks a lot for information!
>
> Pavel
>
> -----Original Message-----
> From: oisf-users-bounces at lists.openinfosecfoundation.org
> [mailto:oisf-users-bounces at lists.openinfosecfoundation.org] On Behalf Of
>
> Victor Julien
> Sent: Friday, March 27, 2015 1:50 PM
> To: oisf-users at lists.openinfosecfoundation.org
> Subject: Re: [Oisf-users] Suricata - Reject in one-arm IPS/IDS mode
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On 03/23/2015 08:09 PM, Rovnov Pavel wrote:
> > Hello Coop, Anthony,
> >
> > I don't control neither users nor web servers. So I can't instruct
> > users to use proxy or run all web applications through reverse-proxy.
> >
> > Inline mode is not acceptable in my scenario (let me say the guy who
> > owns infrastructure doesn't allow me to be inline).
> >
> > What I can is to use mirrored traffic to do my analysis. So the
> > question remains the same:
> >
> > 1)    Can I use reject when out-of-band?
>
> Yeah.
>
> > 2)    How can I specify interface to send rejects from? I can't use
> > 2-way SPAN port on my switch.
>
> Not sure here. I think you'd need another nic thats on your switch. We
> use libnet, not sure how it selects the nic to use. Might use the nic
> that has a valid route to the destination? Think you'll need to
> experiment here.
>
> Cheers,
> Victor
>
>
> >
> > Thanks!
> >
> > -----Original Message----- From: Cooper F. Nelson
> > [mailto:cnelson at ucsd.edu] Sent: Monday, March 23, 2015 9:59 PM To:
> > Rodgers, Anthony (DTMB); Rovnov Pavel;
> > oisf-users at lists.openinfosecfoundation.org Subject: Re:
> > [Oisf-users] Suricata - Reject in one-arm IPS/IDS mode
> >
> > +1 to using a web proxy.  Squid is free.
> >
> > You can even run suricata inline on a squid proxy and create a robust,
>
> > next-generation proxy-firewall with Layer-7 intrusion
> > detection/prevention.
> >
> > -Coop
> >
> > On 3/23/2015 9:17 AM, Rodgers, Anthony (DTMB) wrote:
> >> Why not use a web proxy like squid for this?
> >
> >
> >
> >> --
> >
> >> Anthony Rodgers
> >
> >> Security Analyst
> >
> >> Michigan Security Operations Center (MiSOC)
> >
> >> DTMB, Michigan Cyber Security
> >
> >
> > _______________________________________________ Suricata IDS Users
> > mailing list: oisf-users at openinfosecfoundation.org Site:
> > http://suricata-ids.org | Support:
> > http://suricata-ids.org/support/ List:
> > https://lists.openinfosecfoundation.org/mailman/listinfo/oisf-users
> >
> >
> Training now available: http://suricata-ids.org/training/
> >
>
> - --
> - ---------------------------------------------
> Victor Julien
> http://www.inliniac.net/
> PGP: http://www.inliniac.net/victorjulien.asc
> - ---------------------------------------------
>
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1
>
> iQEcBAEBAgAGBQJVFTXIAAoJEMH0leOSaFa0mO8H/05kirfk52HYTIOwVmqFytqG
> XseeP3BYaLPL6W/f9/+XCU+gqpZn+BbaBG3znot1pXKeEAuNrVzjrT228ASpbIsV
> 6ymTBuyOwgTXYvofW47sCEpRlcc5fukAqWYTxmmrLQJpfMMjUfq9v74IqJBeL0x2
> Cu9VHICY9RxDyYUBYSakGX4DeVmTIYNdEYw5qe0jdw+2Ikv4v27ef1Sm5cpknKLG
> AWGeflIEiQWWuMkRxw1HMMdbc3mmniA3tbzuktvp88o6vsKBlgoa45SsX0EvfjeL
> rn5Q7q46ehOblJp+94pfHC20dbZUGmcO7Ax9VFGhDeeuxn1baPahuTcuoRsuyz4=
> =YRJv
> -----END PGP SIGNATURE-----
> _______________________________________________
> Suricata IDS Users mailing list: oisf-users at openinfosecfoundation.org
> Site: http://suricata-ids.org | Support:
> http://suricata-ids.org/support/
> List:
> https://lists.openinfosecfoundation.org/mailman/listinfo/oisf-users
> Training now available: http://suricata-ids.org/training/
> _______________________________________________
> Suricata IDS Users mailing list: oisf-users at openinfosecfoundation.org
> Site: http://suricata-ids.org | Support: http://suricata-ids.org/support/
> List: https://lists.openinfosecfoundation.org/mailman/listinfo/oisf-users
> Training now available: http://suricata-ids.org/training/
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openinfosecfoundation.org/pipermail/oisf-users/attachments/20150402/503d2ce3/attachment-0002.html>