Internet Standards. Sam Silberman, Constant Contact
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1 Internet Standards Sam Silberman, Constant Contact
2 What are Standards?
3 World without Standards
4 We live in a connected world
5 Topics DMARC (Indirect flows) Security/Privacy TLS over SMTP End-to-end encryption SMTP over IPv6 Activities in the IETF APPSAWG
6 How does DMARC work? Organization publishes a DMARC policy on their domain P=none Participating ISPs sends the organization authentication and forensic reports Organization audits their outbound sending practices Centralizes outbound mail DKIM signs all outbound mail Publishes/updates SPF Repeat Only after exhaustive analysis, organization can enable DMARC p=reject
7 Who should enable DMARC? Large organizations who s brand (domain name) is used as part of a phishing scam. Banks (Bank of America, Amex) Popular brands (PayPal, Ebay, Amazon) Government agencies (IRS)
8 Who should not use DMARC? When individuals within the org need to send mail via indirect flows Mailing lists ESPs Proxy/forwarders Any organization where the mailbox owner requires to send mail via Indirect flows. Mailbox service providers (ISPs) Large corporations (no brand risk)
9 Proposed Mitigations Customer use non-dmarc hosted mailbox Proxy FROM address (Address re-write) FROM Sam Reply-To: Obtain permission to DKIM sign on behalf of ISP AOL.COM CS.COM AIM.COM Relay through domain owner s SMTP server
10 Proposed Mitigations "Delegating DKIM Signing Authority draft-kucherawy-dkim-delegate-01 (work in progress), June "DKIM Conditional Signatures draft-levine-dkim-conditional-00 (work in progress), June "A List-safe Canonicalization for DomainKeys Identified Mail (DKIM) draft-kucherawy-dkim-list-canon-00 (work in progress), June "Recognized Transformations of Messages Bearing DomainKeys Identified Mail (DKIM) Signatures draft-kucherawy-dkim-transform-00 (work in progress), April "Third-Party Authorization Label draft-otis-tpa-label-00 (work in progress), May Reference:
11 Security/Privacy Session (point to point) encryption TLS End-to-end encryption
12 Security/Privacy The DNS Based Authentication of Named Entities (DANE) Session (point to point) encryption TLS DANE Opportunistic TLS SMTP security via opportunistic DANE TLS draft-ietf-dane-smtp-with-dane-16 DANE published keys TLS Protocol using TLSA record in DNS RFC 6698 (was draft-ietf-dane-protocol)
13 Security/Privacy End to End Encryption Dane Using DANE to Associate OpenPGP public keys with addresses draft-ietf-dane-openpgpkey-03 Using Secure DNS to Associate Certificates with Domain Names For S/MIME draft-ietf-dane-smime-08
14 Security/Privacy End to End Encryption De facto standards (browser plug-ins) Google Yahoo
15 SMTP over IPv6 SMTP IPv6 to IPv4 Fallback Required authentication (best practice) Linkedin position Google s position entication_error&rd=1#authentication
16 Activities in the IETF APPSAWG Message Disposition Notification (updates for gateways and I18n) Message Header Field for Indicating Message Authentication Status draft-ietf-appsawg-rfc7001bis-07 Authentication Status Codes (SPF AND DKIM) RFC 7372 (was draft-ietf-appsawg- -auth-codes)
17 Next Steps Get Involved DMARC Speak up about indirect flows Propose solutions SMTP Encryption Implement Opportunistic TLS
18 Questions? Sam
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