Date: Mon, 04 Jan 2010 14:21:39 +0000 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Peter Ulrich Kruppa <ulrich@pukruppa.net> Cc: FreeBsd-Questions <freebsd-questions@freebsd.org> Subject: Re: sendmail: open-relay Message-ID: <4B41F973.4040101@infracaninophile.co.uk> In-Reply-To: <1262613595.9547.28.camel@pukruppa.net> References: <1262613595.9547.28.camel@pukruppa.net>
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Peter Ulrich Kruppa wrote:
> Am Montag, den 04.01.2010, 13:45 +0000 schrieb Matthew Seaman:
>> Matthew Seaman wrote:
>>
>>> find the records in /var/mail/maillog to show abuse.net's server
>> connecting
>>
>> Ooops. /var/log/maillog
>>
> That would be those:
> --------------------------------------------
>> cat maillog | grep "abuse.net"
> Jan 4 12:26:46 pukruppa sm-mta[8964]: o04BQi0O008964:
> from=<prvs=0613aad273=postmaster-ulrich=pukruppa.net@abuse.net>,
> size=333, class=0, nrcpts=1,
> msgid=<20100104112454.38321.qmail@gal.iecc.com>, proto=ESMTP,
> daemon=IPv4, relay=gal.iecc.com [208.31.42.53]
> Jan 4 12:32:12 pukruppa sm-mta[10672]: o04BWBOA010672:
> from=<spamtest@abuse.net>, size=909, class=0, nrcpts=1,
> msgid=<rlytest-1262604620-41202@abuse.net>, proto=SMTP, daemon=IPv4,
> relay=verify.abuse.net [208.31.42.77]
> Jan 4 12:33:00 pukruppa spamd[1650]: spamd: checking message
> <rlytest-1262604620-41202@abuse.net> for ulrich:1001
> Jan 4 12:33:03 pukruppa spamd[1650]: spamd: result: . -4 -
> BAYES_50,FH_DATE_PAST_20XX,RCVD_IN_DNSWL_HI
> scantime=3.4,size=1231,user=ulrich,uid=1001,required_score=5.0,rhost=localhost,raddr=127.0.0.1,rport=28691,mid=<rlytest-1262604620-41202@abuse.net>,bayes=0.486826,autolearn=ham
> Jan 4 13:28:39 pukruppa sm-mta[56503]: o04CSb9P056503:
> from=<spamtest@abuse.net>, size=909, class=0, nrcpts=1,
> msgid=<rlytest-1262608007-71317@abuse.net>, proto=SMTP, daemon=IPv4,
> relay=verify.abuse.net [208.31.42.77]
> Jan 4 13:29:20 pukruppa spamd[1650]: spamd: checking message
> <rlytest-1262608007-71317@abuse.net> for ulrich:1001
> Jan 4 13:29:24 pukruppa spamd[1650]: spamd: result: . -6 -
> AWL,BAYES_00,FH_DATE_PAST_20XX,RCVD_IN_DNSWL_HI
> scantime=3.4,size=1231,user=ulrich,uid=1001,required_score=5.0,rhost=localhost,raddr=127.0.0.1,rport=21436,mid=<rlytest-1262608007-71317@abuse.net>,bayes=0.000000,autolearn=ham
> Jan 4 13:35:47 pukruppa sm-mta[58137]: o04CZkfq058137:
> from=<spamtest@abuse.net>, size=909, class=0, nrcpts=1,
> msgid=<rlytest-1262608435-75287@abuse.net>, proto=SMTP, daemon=IPv4,
> relay=verify.abuse.net [208.31.42.77]
> Jan 4 13:39:20 pukruppa spamd[1650]: spamd: checking message
> <rlytest-1262608435-75287@abuse.net> for ulrich:1001
> Jan 4 13:39:24 pukruppa spamd[1650]: spamd: result: . -6 -
> AWL,BAYES_00,FH_DATE_PAST_20XX,RCVD_IN_DNSWL_HI
> scantime=4.1,size=1231,user=ulrich,uid=1001,required_score=5.0,rhost=localhost,raddr=127.0.0.1,rport=24280,mid=<rlytest-1262608435-75287@abuse.net>,bayes=0.000000,autolearn=ham
> Jan 4 14:27:59 pukruppa sm-mta[87839]: o04DRvKd087839:
> from=<spamtest@abuse.net>, size=906, class=0, nrcpts=1,
> msgid=<rlytest-1262611567-9843@abuse.net>, proto=SMTP, daemon=IPv4,
> relay=verify.abuse.net [208.31.42.77]
> Jan 4 14:29:27 pukruppa spamd[1650]: spamd: checking message
> <rlytest-1262611567-9843@abuse.net> for ulrich:1001
> Jan 4 14:29:30 pukruppa spamd[1650]: spamd: result: . -6 -
> AWL,BAYES_00,FH_DATE_PAST_20XX,RCVD_IN_DNSWL_HI
> scantime=3.1,size=1227,user=ulrich,uid=1001,required_score=5.0,rhost=localhost,raddr=127.0.0.1,rport=27859,mid=<rlytest-1262611567-9843@abuse.net>,bayes=0.000000,autolearn=ham
> ----------------------------------------------------------
>
> BTW. I have read somewhere, there might be problems with hostnames like
> pukruppa.net, since they would allow to relay all mails from .net ?!?
>
Something doesn't add up here -- the log shows the message being processed
by SpamAssassin, but there was no indication in the sendmail .mc file you
showed us of any integration with a spam filter. I'd expect some sort of
milter configuration.
Unfortunately as well, the log line showing the delivery result is usually
one of the ones *following* the line showing the external MTA handing off the message to you. Try grepping for the sendmail queue IDs:
o04BQi0O008964
o04BWBOA010672
o04CSb9P056503
o04CZkfq058137
etc.
The lines that say 'dsn=<something>' are the important bits. If <something>
is 2.0.0 (ie. successful delivery) then you've got a real problem. The result
should be 5.x.y (ie. permanent failure) and a snotty message about 'relaying denied'.
Cheers,
Matthew
btw. you need to update your SpamAssassin rules -- you're triggering
on the FH_DATE_PAST_20XX test all the time, which will give you some false
positives.
--
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
Kent, CT11 9PW
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