HI David, you can use TCPDump with source IP example 

tcpdump src 1.1.1.1 
And or with ports if you want. Like this

tcpdump -nnvvS src thebadguyipaddress and dst port 25





> On Apr 21, 2020, at 17:15, David Bray <da...@brayworth.com.au> wrote:
> 
> Hey Remo, just looking at Andy's suggestion though
> 
> tcpdump - that only copies the data from the port ?
> So if if I were to use Andy's idea - it would be an interference in the port 
> and the data would have to be proxied to the correct port (or lost)
> 
> tcpdump - can I use that on an existing connection
> 
> What I have here is a lot of connections during the day, but then I notice 
> the CPU going up (between swimming, running, hiking and other leisure 
> activities)
> 
> So I just want to say - What are you doing and look  - can tcpdump do that ?
> I see tcpdump host <ip> is an option ...
> 
> I'll see what I can discover there, thanks Remo/Andy
> 
> David Bray
> 0418 745334
> 2 ∞ & <
> 
> 
> On Wed, 22 Apr 2020 at 09:46, <r...@mattei.org <mailto:r...@mattei.org>> 
> wrote:
> The other is to leverage some of Andy’s suggestions and use tcpdump on that 
> port and see 😊
> 
> > Il giorno 21 apr 2020, alle ore 16:40, Andrew Swartz 
> > <awswa...@acsalaska.net <mailto:awswa...@acsalaska.net>> ha scritto:
> > 
> > David,
> > 
> > I have no idea where (or even if) incoming TLS sessions are logged.
> > 
> > I've used "openssl s_client" numerous times to see the details of a 
> > connection, but only from the client perspective.
> > 
> > Openssl does have the "s_server" complement of s_client, but I've never 
> > used it:
> > 
> > https://www.openssl.org/docs/man1.1.0/man1/s_server.html 
> > <https://www.openssl.org/docs/man1.1.0/man1/s_server.html>
> > 
> > Maybe you could:
> > 1. set a firewall rule to redirect the offending IP to a new port, then
> > 2. run openssl s_server listening on the new port in a terminal window and 
> > thus watch the output of the TLS negotiation (or redirect the output to a 
> > file).
> > 
> > I've never done this.  But it seems the easiest way to debug a TLS 
> > negotiation from the server perspective (i.e. see what a remote client is 
> > doing without access to that client).  Others on the list may have better 
> > ideas or even some experience doing this.
> > 
> > -Andy
> > 
> > 
> > 
> >> On 4/20/2020 8:15 PM, David Bray wrote:
> >> Hi Andy - you have grasped the problem accurately
> >> As I understand it, the transaction does not leave a great deal of scope - 
> >> negotiate the encryption, send a password successfully or unsuccessfully - 
> >> (at that point it's logged)
> >> So it has to be the negotiation phase ...
> >> but:
> >>  * I've only just built this server
> >>  * stuck to a standard install using a CentOS 7 VM - 4GB: 2 CPU, 80GB
> >>      o I think this adequate I've seen no OOM events - and the size is
> >>        what I've used before
> >> The only thing I'm really seeing here that could be an issue is - the 
> >> newer machines are stricter on SSL - the TLS 1/1.2 deprecation thing
> >> I see lots of broken servers, and have to /make allowances/, I do this by:
> >>    touch /var/qmail/control/notlshosts/<the host name>
> >> Noting - that is an outbound thing ... (see 
> >> https://www.qmailtoaster.org/notls.html 
> >> <https://www.qmailtoaster.org/notls.html>)
> >> So ...... is it possible that a broken client is hitting the port, not 
> >> being able to make the necessary handshake and causing this CPU load ....
> >> It's reported in the logs when the server makes an outbound transaction 
> >> like that ...
> >>    deferral:
> >>    
> >> TLS_connect_failed:_error:14077410:SSL_routines:SSL23_GET_SERVER_HELLO:sslv3_alert_handshake_failure;_connected_to_103.27.32.20./
> >> What would it look like in my logs if they where to have the reverse issue
> >> David Bray
> >> 0418 745334
> >> 2 ∞ & <
> >> On Tue, 21 Apr 2020 at 02:54, Andrew Swartz <awswa...@acsalaska.net 
> >> <mailto:awswa...@acsalaska.net> <mailto:awswa...@acsalaska.net 
> >> <mailto:awswa...@acsalaska.net>>> wrote:
> >>    Port 465 should be SMTP over SSL/TLS.  Therefore the sequence of
> >>    events is:
> >>    1.  Establish TCP connection
> >>    2.  Negotiate SSL/TLS session
> >>    3.  Begin SMTP session
> >>    Of these, the SSL/TLS negotiation is by far the most CPU-intensive.
> >>    Consider trying to see what is happening with the SSL/TLS negotiation.
> >>    It may be failing in a way which is slamming the CPU but not showing up
> >>    in the SMTP logs because it never completes and thus an SMTP session is
> >>    never initiated.
> >>    I'm unsure the best way to debug the incoming SSL/TLS negotiation.  You
> >>    might set a firewall rule where incoming port 465 from that single
> >>    IP is
> >>    forwarded to stunnel (on another machine) which is set to output
> >>    verbose
> >>    debug info???
> >>    It would be interesting to know the cause.  This could be some clever
> >>    DOS attack where a single connection accomplishes the DOS by slamming
> >>    the CPU by submitting something invalid to openSSL.  But it might just
> >>    be that some spammer is using a home-brewed script which is buggy
> >>    and is
> >>    unintentionally causing this problem.
> >>    There seems no efficient way to block this without figuring out the
> >>    cause and doing something to make that cause be logged into some log
> >>    file.  Once that is accomplished, fail2ban (or something similar) can
> >>    easily add firewall rules to block individual IP's which exhibit this
> >>    behavior.
> >>    -Andy
> >>    On 4/19/2020 10:12 PM, David Bray wrote:
> >>     > Hey thanks Remo
> >>     > smtps is an inbound port, they are contacting me - this IP is in
> >>    Russia
> >>     > somewhere - so do I want to engage (perhaps, probably not but ..)
> >>     >
> >>     > I could of course block that IP - but that doesn't help, I'd have to
> >>     > block endless IPs
> >>     >
> >>     > I'd like to know what's taking the CPU load, in theory they
> >>    should be
> >>     > connecting, supplying a password (perhaps) and sending data
> >>     > but, there are sometimes bad passwords (2 for the 20th recorded
> >>    in maillog)
> >>     >
> >>     > So..
> >>     > What are they doing the other times and why is it taking so much
> >>    CPU -
> >>     > if it is just a port knock, why the CPU
> >>     >
> >>     > I need to be able to say, they are bad because ... *what is the
> >>    because* ?
> >>     >
> >>     > David Bray
> >>     > 0418 745334
> >>     > 2 ∞ & <
> >>     >
> >>     >
> >>     > On Mon, 20 Apr 2020 at 15:32, Remo Mattei <r...@mattei.org 
> >> <mailto:r...@mattei.org>
> >>    <mailto:r...@mattei.org <mailto:r...@mattei.org>>
> >>     > <mailto:r...@mattei.org <mailto:r...@mattei.org> 
> >> <mailto:r...@mattei.org <mailto:r...@mattei.org>>>> wrote:
> >>     >
> >>     >     Hi,
> >>     >     Can you reach the server?  It maybe blocking you. So what
> >>    does your
> >>     >     queue looks like?
> >>     >
> >>     >     Here is mine for example:
> >>     >
> >>     >     # qmHandle -L
> >>     >     Messages in local queue: 0
> >>     >     Messages in remote queue: 0
> >>     >
> >>     >     My other server
> >>     >
> >>     >     # qmHandle -L
> >>     >     10355792 (19, L)
> >>     >        Return-path: r...@qmailxxxxx.com <mailto:r...@qmailxxxxx.com>
> >>    <mailto:r...@qmailxxxxx.com <mailto:r...@qmailxxxxx.com>> 
> >> <mailto:r...@qmailxxxxx.com <mailto:r...@qmailxxxxx.com>
> >>    <mailto:r...@qmailxxxxx.com <mailto:r...@qmailxxxxx.com>>>
> >>     >        From: Anacron <r...@qmailxxxx.com <mailto:r...@qmailxxxx.com>
> >>    <mailto:r...@qmailxxxx.com <mailto:r...@qmailxxxx.com>> 
> >> <mailto:r...@qmailxxxx.com <mailto:r...@qmailxxxx.com>
> >>    <mailto:r...@qmailxxxx.com <mailto:r...@qmailxxxx.com>>>>
> >>     >        To: r...@qmailxxxxx.com <mailto:r...@qmailxxxxx.com> 
> >> <mailto:r...@qmailxxxxx.com <mailto:r...@qmailxxxxx.com>>
> >>    <mailto:r...@qmailxxxxx.com <mailto:r...@qmailxxxxx.com> 
> >> <mailto:r...@qmailxxxxx.com <mailto:r...@qmailxxxxx.com>>>
> >>     >        Subject: Anacron job 'cron.daily' on qmailxxxxx.com 
> >> <http://qmailxxxxx.com/>
> >>    <http://qmailxxxxx.com <http://qmailxxxxx.com/>>
> >>     >     <http://qmailxxxxx.com <http://qmailxxxxx.com/>>
> >>     >        Date: 19 Apr 2020 10:28:28 -0000
> >>     >        Size: 509 bytes
> >>     >
> >>     >     10358746 (6, L)
> >>     >        Return-path:
> >>     >        From: mailer-dae...@qmailxxxxxx.com 
> >> <mailto:mailer-dae...@qmailxxxxxx.com>
> >>    <mailto:mailer-dae...@qmailxxxxxx.com 
> >> <mailto:mailer-dae...@qmailxxxxxx.com>>
> >>     >     <mailto:mailer-dae...@qmailxxxxxx.com 
> >> <mailto:mailer-dae...@qmailxxxxxx.com>
> >>    <mailto:mailer-dae...@qmailxxxxxx.com 
> >> <mailto:mailer-dae...@qmailxxxxxx.com>>>
> >>     >        To: r...@qmailxxxxxxxx.com <mailto:r...@qmailxxxxxxxx.com> 
> >> <mailto:r...@qmailxxxxxxxx.com <mailto:r...@qmailxxxxxxxx.com>>
> >>    <mailto:r...@qmailxxxxxxxx.com <mailto:r...@qmailxxxxxxxx.com> 
> >> <mailto:r...@qmailxxxxxxxx.com <mailto:r...@qmailxxxxxxxx.com>>>
> >>     >        Subject: failure notice
> >>     >        Date: 19 Apr 2020 11:30:30 -0000
> >>     >        Size: 1089 bytes
> >>     >
> >>     >     Messages in local queue: 2
> >>     >     Messages in remote queue: 0
> >>     >
> >>     >     Just wonder it looks that you are using the SMTPs 465, did
> >>    you try
> >>     >     the 587 Submission that address and see if it goes?
> >>     >     Just wonder if this is tight to that service.
> >>     >
> >>     >     Maybe none of the above but just for troubleshooting steps, I
> >>    would
> >>     >     try that.
> >>     >
> >>     >     Remo
> >>     >
> >>     >
> >>     >>     On Apr 19, 2020, at 22:11, David Bray
> >>    <da...@brayworth.com.au <mailto:da...@brayworth.com.au> 
> >> <mailto:da...@brayworth.com.au <mailto:da...@brayworth.com.au>>
> >>     >>     <mailto:da...@brayworth.com.au <mailto:da...@brayworth.com.au>
> >>    <mailto:da...@brayworth.com.au <mailto:da...@brayworth.com.au>>>> wrote:
> >>     >>
> >>     >>     Ok - but after all the investigation etc, this is actually the
> >>     >>     trigger which caught my eye in the first place
> >>     >>
> >>     >>     How this comes about is:
> >>     >>
> >>     >>      1. User say hey I can't send
> >>     >>      2. I look and see this high CPU load and intermittent failures
> >>     >>         for client to send
> >>     >>
> >>     >>     Any thoughts on where to start looking ..
> >>     >>
> >>     >>
> >>     >>     <image.png>
> >>     >>
> >>     >>     my smtp/smtps are currently *10*/11 connections
> >>     >>
> >>     >>
> >>     >>     ==> /var/log/qmail/smtp/current <==
> >>     >>     2020-04-20 05:07:50.207299500 tcpserver: end 29699 status 0
> >>     >>     2020-04-20 05:07:50.207300500 tcpserver: status: 0/60
> >>     >>
> >>     >>     ==> /var/log/qmail/smtps/current <==
> >>     >>     2020-04-20 05:07:54.903665500 tcpserver: status: 9/60
> >>     >>     2020-04-20 05:07:54.936654500 tcpserver: pid 29725 from
> >>    185.50.149.5
> >>     >>     2020-04-20 05:07:54.936655500 tcpserver: ok 29725
> >>     >> dev.brayworth.com <http://dev.brayworth.com/> 
> >> <http://dev.brayworth.com <http://dev.brayworth.com/>>
> >>    <http://dev.brayworth.com 
> >> <http://dev.brayworth.com/>>:172.105.181.18:465 
> >> <http://172.105.181.18:465/>
> >>    <http://172.105.181.18:465 <http://172.105.181.18:465/>>
> >>     >>     <http://172.105.181.18:465 <http://172.105.181.18:465/>> 
> >> :185.50.149.5::5622
> >>     >>     2020-04-20 05:08:00.108657500 tcpserver: status: 10/60
> >>     >>     2020-04-20 05:08:00.152909500 tcpserver: pid 29734 from
> >>    185.50.149.5
> >>     >>     2020-04-20 05:08:00.152910500 tcpserver: ok 29734
> >>     >> dev.brayworth.com <http://dev.brayworth.com/> 
> >> <http://dev.brayworth.com <http://dev.brayworth.com/>>
> >>    <http://dev.brayworth.com 
> >> <http://dev.brayworth.com/>>:172.105.181.18:465 
> >> <http://172.105.181.18:465/>
> >>    <http://172.105.181.18:465 <http://172.105.181.18:465/>>
> >>     >>     <http://172.105.181.18:465 <http://172.105.181.18:465/>> 
> >> :185.50.149.5::62006
> >>     >>     2020-04-20 05:08:05.172650500 tcpserver: status: *11*/60
> >>     >>     2020-04-20 05:08:05.208983500 tcpserver: pid 29740 from
> >>    185.50.149.5
> >>     >>     2020-04-20 05:08:05.208984500 tcpserver: ok 29740
> >>     >> dev.brayworth.com <http://dev.brayworth.com/> 
> >> <http://dev.brayworth.com <http://dev.brayworth.com/>>
> >>    <http://dev.brayworth.com 
> >> <http://dev.brayworth.com/>>:172.105.181.18:465 
> >> <http://172.105.181.18:465/>
> >>    <http://172.105.181.18:465 <http://172.105.181.18:465/>>
> >>     >>     <http://172.105.181.18:465 <http://172.105.181.18:465/>> 
> >> :185.50.149.5::19686
> >>     >>     2020-04-20 05:08:13.601336500 tcpserver: end 29690 status 256
> >>     >>     2020-04-20 05:08:13.601337500 tcpserver: status: 10/60
> >>     >>
> >>     >>     David Bray
> >>     >>     0418 745334
> >>     >>     2 ∞ & <
> >>     >>
> >>     >>
> >>     >>     On Sun, 19 Apr 2020 at 10:04, David Bray
> >>    <da...@brayworth.com.au <mailto:da...@brayworth.com.au> 
> >> <mailto:da...@brayworth.com.au <mailto:da...@brayworth.com.au>>
> >>     >>     <mailto:da...@brayworth.com.au <mailto:da...@brayworth.com.au>
> >>    <mailto:da...@brayworth.com.au <mailto:da...@brayworth.com.au>>>> wrote:
> >>     >>
> >>     >>         Thanks Eric
> >>     >>
> >>     >>         It's hard to track things but I think I have had success
> >>     >>         monitoring the /var/log/maillog
> >>     >>
> >>     >>         I'm not sure why I didn't pick this up earlier, I'm
> >>     >>         already using the fail2ban suggestion of the older
> >>     >>         qmailtoaster wiki
> >>     >>         (http://wiki.qmailtoaster.com/index.php/Fail2Ban 
> >> <http://wiki.qmailtoaster.com/index.php/Fail2Ban>), actually
> >>     >>         had a rule to process it and have expanded on this now
> >>     >>
> >>     >>         I've been running email servers most of my working life and
> >>     >>         still get tripped up by simple stuff
> >>     >>
> >>     >>         Thank for your efforts in this area, it helps to talk
> >>    things out
> >>     >>
> >>     >>         cheers
> >>     >>
> >>     >>         David Bray
> >>     >>         0418 745334
> >>     >>         2 ∞ & <
> >>     >>
> >>     >>
> >>     >>         On Sun, 19 Apr 2020 at 01:12, Eric Broch
> >>     >>         <ebr...@whitehorsetc.com <mailto:ebr...@whitehorsetc.com>
> >>    <mailto:ebr...@whitehorsetc.com <mailto:ebr...@whitehorsetc.com>> 
> >> <mailto:ebr...@whitehorsetc.com <mailto:ebr...@whitehorsetc.com>
> >>    <mailto:ebr...@whitehorsetc.com <mailto:ebr...@whitehorsetc.com>>>> 
> >> wrote:
> >>     >>
> >>     >>             It looks like a connect and disconnect. If there was
> >>     >>             authentication you'd see it. I don't think you have
> >>     >>             anything to worry about here. I'm not saying there's not
> >>     >>             some jerk out there messing with your smtps...just
> >>    saying
> >>     >>             it may be harmless. That said, do you have a good
> >>    firewall
> >>     >>             in place that prevents DOS attacks. I use Sonicwall
> >>    myself
> >>     >>             but you can do the same thing as others have shown with
> >>     >>             iptables.
> >>     >>
> >>     >>             Does anyone know how to do the same with the stock
> >>     >>             firewalld on COS7/8?
> >>     >>
> >>     >>             On 4/17/2020 11:49 PM, David Bray wrote:
> >>     >>>             sure - thanks for replying, this comes in waves taking
> >>     >>>             the server to it's maximum at times
> >>     >>>
> >>     >>>             as far as I can see this only logs are this:
> >>     >>>
> >>     >>>             ==> /var/log/qmail/smtps/current <==
> >>     >>>             2020-04-18 05:04:48.450871500 tcpserver: status: 6/60
> >>     >>>             2020-04-18 05:04:48.480785500 tcpserver: pid 13339 from
> >>     >>>             141.98.80.30
> >>     >>>             2020-04-18 05:04:48.480787500 tcpserver: ok 13339
> >>     >>> dev.brayworth.com <http://dev.brayworth.com/> 
> >> <http://dev.brayworth.com <http://dev.brayworth.com/>>
> >>     >>>             <http://dev.brayworth.com 
> >> <http://dev.brayworth.com/>>:172.105.181.18:465 
> >> <http://172.105.181.18:465/>
> >>    <http://172.105.181.18:465 <http://172.105.181.18:465/>>
> >>     >>>             <http://172.105.181.18:465 
> >> <http://172.105.181.18:465/>> :141.98.80.30::25638
> >>     >>>             2020-04-18 05:04:52.797644500 tcpserver: status: 7/60
> >>     >>>             2020-04-18 05:04:52.830767500 tcpserver: pid 13340 from
> >>     >>>             141.98.80.30
> >>     >>>             2020-04-18 05:04:52.830768500 tcpserver: ok 13340
> >>     >>> dev.brayworth.com <http://dev.brayworth.com/> 
> >> <http://dev.brayworth.com <http://dev.brayworth.com/>>
> >>     >>>             <http://dev.brayworth.com 
> >> <http://dev.brayworth.com/>>:172.105.181.18:465 
> >> <http://172.105.181.18:465/>
> >>    <http://172.105.181.18:465 <http://172.105.181.18:465/>>
> >>     >>>             <http://172.105.181.18:465 
> >> <http://172.105.181.18:465/>> :141.98.80.30::14862
> >>     >>>             2020-04-18 05:04:57.248902500 tcpserver: status: 8/60
> >>     >>>             2020-04-18 05:04:57.304003500 tcpserver: pid 13342 from
> >>     >>>             141.98.80.30
> >>     >>>             2020-04-18 05:04:57.304006500 tcpserver: ok 13342
> >>     >>> dev.brayworth.com <http://dev.brayworth.com/> 
> >> <http://dev.brayworth.com <http://dev.brayworth.com/>>
> >>     >>>             <http://dev.brayworth.com 
> >> <http://dev.brayworth.com/>>:172.105.181.18:465 
> >> <http://172.105.181.18:465/>
> >>    <http://172.105.181.18:465 <http://172.105.181.18:465/>>
> >>     >>>             <http://172.105.181.18:465 
> >> <http://172.105.181.18:465/>> :141.98.80.30::9646
> >>     >>>             2020-04-18 05:05:01.854790500 tcpserver: status: 9/60
> >>     >>>             2020-04-18 05:05:01.902265500 tcpserver: pid 13345 from
> >>     >>>             141.98.80.30
> >>     >>>             2020-04-18 05:05:01.902266500 tcpserver: ok 13345
> >>     >>> dev.brayworth.com <http://dev.brayworth.com/> 
> >> <http://dev.brayworth.com <http://dev.brayworth.com/>>
> >>     >>>             <http://dev.brayworth.com 
> >> <http://dev.brayworth.com/>>:172.105.181.18:465 
> >> <http://172.105.181.18:465/>
> >>    <http://172.105.181.18:465 <http://172.105.181.18:465/>>
> >>     >>>             <http://172.105.181.18:465 
> >> <http://172.105.181.18:465/>> :141.98.80.30::54058
> >>     >>>             2020-04-18 05:05:09.729711500 tcpserver: end 13338
> >>    status 256
> >>     >>>             2020-04-18 05:05:09.729713500 tcpserver: status: 8/60
> >>     >>>             2020-04-18 05:06:05.965715500 tcpserver: end 13342
> >>    status 256
> >>     >>>             2020-04-18 05:06:05.965716500 tcpserver: status: 7/60
> >>     >>>             2020-04-18 05:06:06.141272500 tcpserver: end 13340
> >>    status 256
> >>     >>>             2020-04-18 05:06:06.141273500 tcpserver: status: 6/60
> >>     >>>
> >>     >>>             David Bray
> >>     >>>             0418 745334
> >>     >>>             2 ∞ & <
> >>     >>>
> >>     >>>
> >>     >>>             On Sat, 18 Apr 2020 at 15:41, Eric Broch
> >>     >>>             <ebr...@whitehorsetc.com 
> >> <mailto:ebr...@whitehorsetc.com>
> >>    <mailto:ebr...@whitehorsetc.com <mailto:ebr...@whitehorsetc.com>>
> >>     >>>             <mailto:ebr...@whitehorsetc.com 
> >> <mailto:ebr...@whitehorsetc.com>
> >>    <mailto:ebr...@whitehorsetc.com <mailto:ebr...@whitehorsetc.com>>>> 
> >> wrote:
> >>     >>>
> >>     >>>                 Can you send the log of one of the "bad"
> >>    connections?
> >>     >>>
> >>     >>>                 On 4/17/2020 10:59 PM, David Bray wrote:
> >>     >>>
> >>     >>>>                 I can see I'm getting hammered on my smtps port
> >>     >>>>
> >>     >>>>                 How can I mitigate this?
> >>     >>>>
> >>     >>>>                 I can see the IP's in /var/log/qmail/smtps/current
> >>     >>>>
> >>     >>>>                 *but where do I actually see that the smtp auth
> >>     >>>>                 actually fails ?*
> >>     >>>>
> >>     >>>>                 or do I need to increase the logging somewhere ?
> >>     >>>>
> >>     >>>>                 if I tail -f /var/log/dovecot.log
> >>     >>>>
> >>     >>>>                 I can see the imap and pop failures
> >>     >>>>
> >>     >>>>                 thanks in advance
> >>     >>>>
> >>     >>>>                 David Bray
> >>     >>>>                 0418 745334
> >>     >>>>                 2 ∞ & <
> >>     >>>
> >>     >
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