On Wed, Aug 29, 2018 at 6:20 PM Telium Support Group
<[email protected]> 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:[email protected]] On Behalf Of sean
darcy
Sent: Wednesday, August 29, 2018 6:33 PM
To: [email protected]
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:[email protected]]
On Behalf Of sean darcy
Sent: Wednesday, August 29, 2018 10:46 AM
To: [email protected]
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 <[email protected]
<mailto:[email protected]>> 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 [1]
<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:[email protected]
<mailto:sip%[email protected]>>;tag=1872048972
To: <sip:[email protected]
<mailto:sip%[email protected]>>;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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Check out the new Asterisk community forum at:
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New to Asterisk? Start here:
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asterisk-users mailing list
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Links:
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[1] http://5.199.133.128:52734
