Email Authentications INBOX Authentication Panel San Jose, CA – 2004 Dave Crocker Brandenburg InternetWorking INBOX Authentication Panel San Jose, CA –

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Presentation transcript:

Authentications INBOX Authentication Panel San Jose, CA – 2004 Dave Crocker Brandenburg InternetWorking INBOX Authentication Panel San Jose, CA – 2004 Dave Crocker Brandenburg InternetWorking

2 2 D. CrockerINBOX / Authentication – SJ,2004 Security Functions for TermFunctions Identification Who/What does this purport to be? Authentication Is it really them? Authorization What are they allowed to do? Accreditation What do I think of the agency giving them that permission?

3 3 D. CrockerINBOX / Authentication – SJ,2004 IdentitiesIdentities ReferenceSemantic Peer MTA IPSMTP client EHLO DomainSMTP client Provider IPSMTP client site Mail-From Bounces address From Author Sender Posting agent Received Handling sites ReferenceSemantic Peer MTA IPSMTP client EHLO DomainSMTP client Provider IPSMTP client site Mail-From Bounces address From Author Sender Posting agent Received Handling sites

4 4 D. CrockerINBOX / Authentication – SJ,2004 Security Models Object Channel Secur MailSecur Secure Mail Mail Mail Mail Mail MTA MTA MTA MTA MTA MTA MTA Secure Secure Secure MTA Secure MTA MTA Secure MTA MTA MTA Secure MTA Secure

5 5 D. CrockerINBOX / Authentication – SJ,2004

6 6 The Path in a Kinder, Simpler World MUA MSAMTA MDA MUA Peer MTA Mail Agents MUA = User MSA = Submission MTA= Transfer MDA= Delivery

7 7 D. CrockerINBOX / Authentication – SJ,2004 MTA Path(s) Today MUA MSAMTA MDA MUA MTA Peer MTA MTA

8 8 D. CrockerINBOX / Authentication – SJ,2004 MTA SMTP 2821.MailFrom Reg oMUAMSA MTA 1 MTA 4 MDArMUA MTA 3 MTA 2 Peer MTA Assigns MailFrom (bounce address) Did MSA authorize MTA 1 to send this message ? Did MSA authorize MTA 2 to send this message ? Did MSA authorize MTA 3 to send this message ? 1.Authority and Accreditation of MSA and MSA domain administrators 2.MSA must pre- register and trust each MTA in path

9 9 D. CrockerINBOX / Authentication – SJ,2004 MTA SMTP RFC2821.HELO Reg oMUAMSAMTA 1 MTA 4 MDArMUA MTA 3 MTA 2 Did administrator of domain asserted by MTA 1 authorize it to be an MTA ? Did administrator of domain asserted by MTA 2 authorize it to be an MTA ? Did administrator of domain asserted by MTA 3 authorize it to be an MTA ? Peer MTA 1.Authority/Accreditation of Domain Administrator 2.Trust of latest-hop network operation