NORDUnet Nordic Infrastructure for Research & Education. Intro. SPAM-hantering på NUNOC och internt i SUNET
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1 Intro SPAM-hantering på NUNOC och internt i SUNET
2 Intro Förkortningar som är bra att kunna: MTA MUA MDA Mail Transfer Agent ex. Sendmail, Postfix, Qmail Mail User Agent ex. Thunderbird, Eudora, Pine, mutt Mail Delivery Agent ex. Procmail, mail.local
3 Intro (Något förenklat) består ett av: Envelope (from / to) De adresser under SMTP-handskakningen (MAIL FROM: / RCPT TO:) Header(s) + Body Det som kommer i SMTP-fasen DATA <CRLF> ---> <CRLF>. <CRLF>
4 Intro
5 Kort om lite olika tekniker att förhindra spam & falsk epost i osorterad ordning...
6 RFC Polis Följ alla RFC:er nitiskt! (och kanske mer än vad som står ändå...) 220 ex1.mydomain.com ESMTP mailer ready at Wed, 14 Nov :53: HELO ex2.yourdomain.com 250 ex1.mydomain.com Hello ex2.yourdomain.com [x.x.x.x], pleased to meet you MAIL FROM: Sender ok RCPT TO: Recipient ok DATA 354 Enter mail, end with "." on a line by itself laekrmfo Message accepted for delivery
7 Svartlistor DNSBL (aka. RBL) SpamHaus.org SORBS.net SpamCop.net njabl.org RHSBL RFC-ignorant Tarpits
8 Grålistning Greylisting (och Whitelisting) Evan Harris
9 Grålistning
10 SPF med fl. Responsible Submitter RFC 4405 E. Allman, H. Katz Sender-ID / PRA RFC 4406, RFC 4407 J. Lyon, M. Wong SPF (Classic) RFC 4408 M. Wong, W. Schlitt
11 SPF / Sender ID IN TXT v=spf1... -all IN TXT spf2.0/mfrom,pra... -all
12 DomainKey med fl. DomainKey RFC 4870, M. Delany Internet Identified Mail draft, J. Fenton DKIM RFC 4871, E. Allman, J. Callas, M. Delany, M. Libbey, J. Fenton, M. Thomas DKIM-SSP draft, E. Allman, m.fl.
13 DKIM header Hur ser DKIM headern ut? DKIM-Signature: a=rsa-sha1; c=nowsp/nowsp; d=mydomain.com; s=selector; t= ; h=x-domainkeys:domainkey-signature:received:received: X-MimeOLE:Content-class:MIME-Version:Content-Type:Subject:Date: Message-ID:X-MS-Has-Attach:X-MS-TNEF-Correlator:Thread-Topic: Thread-Index:From:To:Cc:X-OriginalArrivalTime:X-Virus-Scanned: X-Virus-Status; b=l3chfr+gswrdsvbxv3cxmfhry/9vn+zbvodb6+9gemiuwtv6 LJB4SjNCP9K3rYqIQLmKkPvmXc59913GP6RFZ5OQ5B3o0Ki/vm6Wy7luBd89G5ckEXV UY/UQ+k+4iG43O3zETbB6DZaPSKGqCq8F8KBi3a3NT/F1MdGAYPDqKn4=
14 Hur gör vi? Följer Statskontorets vägledning Dock ingen karantän. dvs. det som släpps igenom, hamnar i användarens inkorg/spam-folder. Droppa inget på golvet. reject:a i värsta fall.
15 En Kombi? Idé: Om man skulle kombinera white, grey och black -list?
16 Exempel på Svartlista Exempel S ORBS http.dnsbl.sorbs.net socks.dnsbl.sorbs.net misc.dnsbl.sorbs.net smtp.dnsbl.sorbs.net new.spam.dnsbl.sorbs.net recent.spam.dnsbl.sorbs.net old.spam.dnsbl.sorbs.net spam.dnsbl.sorbs.net escalations.dnsbl.sorbs.net web.dnsbl.sorbs.net block.dnsbl.sorbs.net zombie.dnsbl.sorbs.net dul.dnsbl.sorbs.net badconf.rhsbl.sorbs.net nomail.rhsbl.sorbs.net
17 Tekniska specs. Vad använder vi oss av? Sendmail + LOCAL_RULESETS tillägg milter-greylist MIMEDefang (standard filter + egna tillägg) SpamAssassin ClamAV Perl moduler, bla. Net::DNS, Net::ValidMX (i mimedefang-filter) spamd / pf
18 Slut Frågor?
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