[asterisk-users] getting invites to rtp ports ??
John Covici
covici at ccs.covici.com
Thu Aug 30 09:32:31 CDT 2018
The message currently in the log is not a security message and does
not contain the ip address, would it be useful to block ip address
from that message or is the challenge message sufficient?
On Thu, 30 Aug 2018 09:37:58 -0400,
Matthew Jordan wrote:
>
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> On Thu, Aug 30, 2018 at 6:02 AM John Covici <covici at ccs.covici.com> wrote:
>
> I agree, but is it possible to try over and over with anything other
> than the challenge warning in the security log as sean suggested and
> put a patch for?
>
> I don't think I understand your question.
>
> You shouldn't need a patch if you are using the SECURITY log. The thread above is suggesting patching the source code to hijack a WARNING message for the purposes of tracing security information; my point is that you should have a
> specific SECURITY log message that already serves that purpose.
>
>
>
> On Wed, 29 Aug 2018 22:52:05 -0400,
> Matthew Jordan wrote:
> >
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> > On Wed, Aug 29, 2018 at 6:20 PM Telium Support Group <support at telium.ca> wrote:
> >
> > Depending on log trolling (Asterisk security log) misses a lot, and also depends on the SIP/PJSIP folks to not change message structure (which has already happened numerous time). If you are comfortable hacking chan_sip.c you
> may
> > prefer to get the same messages from the AMI. It still misses a lot but that approach is better than nothing.
> >
> > Digium warns not to use fail2ban / log trolling as a security system: http://forums.asterisk.org/viewtopic.php?p=159984
> >
> > That's some pretty old advice.
> >
> > The rationale for *not* using general log messages with fail2ban still stands: the general WARNING/NOTICE/etc. log messages are subject to change between versions, and no one wants that to impact someone's security. So you should
> not use
> > those messages as input into fail2ban.
> >
> > That rationale did lead to the 'security' event type in log messages. Security Event Logging - as it is called - got added into Asterisk quite some time ago. So long ago I'm really not sure which version. At a minimum, Asterisk 11,
> but
> > I'm pretty sure it was in 10 as well.
> >
> > Documentation for it can be found here:
> >
> > https://wiki.asterisk.org/wiki/display/AST/Asterisk+Security+Event+Logger
> >
> > And here:
> >
> > https://wiki.asterisk.org/wiki/display/AST/Logging+Configuration
> >
> > Note that this also fires off AMI events (and ARI events, IIRC).
> >
> > If, for whatever reason, you do not get a SECURITY log message or a corresponding event when something 'bad' happens, that would be worth some additional discussion. If anything, the events can be a bit chatty...
> >
> >
> > -----Original Message-----
> > From: asterisk-users [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of sean darcy
> > Sent: Wednesday, August 29, 2018 6:33 PM
> > To: asterisk-users at lists.digium.com
> > Subject: Re: [asterisk-users] getting invites to rtp ports ??
> >
> > On 08/29/2018 11:59 AM, Telium Support Group wrote:
> > > Block a single IP is the wrong approach (whack-a-mole). You should consider a more comprehensive approach to securing your VoIP environment. Have a look at this wiki:
> > >
> > > https://www.voip-info.org/asterisk-security/
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: asterisk-users [mailto:asterisk-users-bounces at lists.digium.com]
> > > On Behalf Of sean darcy
> > > Sent: Wednesday, August 29, 2018 10:46 AM
> > > To: asterisk-users at lists.digium.com
> > > Subject: Re: [asterisk-users] getting invites to rtp ports ??
> > >
> > > On 08/29/2018 09:42 AM, Carlos Rojas wrote:
> > >> Hi
> > >>
> > >> Probably somebody is trying to hack your system, you should block
> > >> that ip on your firewall.
> > >>
> > >> Regards
> > >>
> > >> On Wed, Aug 29, 2018 at 9:34 AM, sean darcy <seandarcy2 at gmail.com
> > >> <mailto:seandarcy2 at gmail.com>> wrote:
> > >>
> > >> I'm getting invites to very high ports every 30 seconds from a
> > >> particular ip address:
> > >>
> > >> Retransmitting #10 (NAT) to 5.199.133.128:52734
> > >> <http://5.199.133.128:52734>:
> > >> SIP/2.0 401 Unauthorized
> > >> Via: SIP/2.0/UDP
> > >> 0.0.0.0:52734;branch=z9hG4bK1207255353;received=5.199.133.128;rport=52734
> > >> From: <sip:37120116780191250 at 67.80.191.250
> > >> <mailto:sip%3A37120116780191250 at 67.80.191.250>>;tag=1872048972
> > >> To: <sip:3712011972592181418 at 67.80.191.250
> > >> <mailto:sip%3A3712011972592181418 at 67.80.191.250>>;tag=as3a52e748
> > >> Call-ID: 1504207870-295758084-609228182
> > >> CSeq: 1 INVITE
> > >> .......
> > >> WARNING[150318]: chan_sip.c:4127 retrans_pkt: Timeout on
> > >> 1504207870-295758084-609228182...
> > >>
> > >> I thought invites had to go to port 5060 or so. I don't understand
> > >> why somebody (let's assume a bad guy) is trying ports above 50000.
> > >>
> > >> sean
> > >>
> > >>
> > >
> > > Ok, so the high port is not the destination port but the source port.
> > >
> > > So I hacked the log warning in chan_sip.c on non-critical invites to show the source ip:
> > >
> > > ast_log(LOG_WARNING, "Timeout on %s non-critic invite trans from
> > > %s.\n",
> > > pkt->owner->callid,ast_sockaddr_stringify(sip_real_dst(pkt->owner)));
> > >
> > > With that in the log, I'm now blocking the ip addresses.
> > >
> > > Thanks,
> > > sean
> > >
> > >
> > > --
> > > _____________________________________________________________________
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> > >
> >
> > I agree. That's why I hacked chan_sip.c to get the addresses in the log.
> >
> > I'm surprised they're not in the log by default. I must be the only person who gets these "non-critical invites".
> >
> > sean
> >
> > --
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> > --
> > Matthew Jordan
> > Digium, Inc. | CTO
> > 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> > Check us out at: http://digium.com & http://asterisk.org
> > [2 <text/plain; utf-8 (base64)>]
> > --
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> >
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> >
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> >
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> --
> Your life is like a penny. You're going to lose it. The question is:
> How do
> you spend it?
>
> John Covici wb2una
> covici at ccs.covici.com
>
> --
> _____________________________________________________________________
> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>
> Astricon is coming up October 9-11! Signup is available at: https://www.asterisk.org/community/astricon-user-conference
>
> Check out the new Asterisk community forum at: https://community.asterisk.org/
>
> New to Asterisk? Start here:
> https://wiki.asterisk.org/wiki/display/AST/Getting+Started
>
> asterisk-users mailing list
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> --
> Matthew Jordan
> Digium, Inc. | CTO
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> Check us out at: http://digium.com & http://asterisk.org
> [2 <text/plain; utf-8 (base64)>]
> --
> _____________________________________________________________________
> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>
> Astricon is coming up October 9-11! Signup is available at: https://www.asterisk.org/community/astricon-user-conference
>
> Check out the new Asterisk community forum at: https://community.asterisk.org/
>
> New to Asterisk? Start here:
> https://wiki.asterisk.org/wiki/display/AST/Getting+Started
>
> asterisk-users mailing list
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--
Your life is like a penny. You're going to lose it. The question is:
How do
you spend it?
John Covici wb2una
covici at ccs.covici.com
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