Re: [dane] Meeting at IETF89 (London).
Viktor Dukhovni <viktor1dane@dukhovni.org> Fri, 17 January 2014 00:04 UTC
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Date: Fri, 17 Jan 2014 00:04:02 +0000
From: Viktor Dukhovni <viktor1dane@dukhovni.org>
To: dane@ietf.org
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Subject: Re: [dane] Meeting at IETF89 (London).
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On Thu, Jan 16, 2014 at 10:58:16AM -0500, Warren Kumari wrote: > Hopefully they will manage to get this done in January -- once that is > done, adding the TLSA record (and updating the documentation!) should > be (hopefully) quick and easy... > > 220 ietfa.amsl.com ESMTP Postfix > EHLO example.com > 250-ietfa.amsl.com > 250-PIPELINING > 250-SIZE 67108864 > 250-ETRN > 250-AUTH PLAIN LOGIN > 250-AUTH=PLAIN LOGIN > 250-ENHANCEDSTATUSCODES > 250-8BITMIME > 250 DSN Recommended reading for AMSL: http://www.postfix.org/TLS_README.html#server_tls http://www.postfix.org/FORWARD_SECRECY_README.html#quick-start Postfix 2.11.0 has been released. If they are in a position to build their own package, they should consider going with that. Otherwise, they can upgrade at a later date, when their O/S vendor makes an updated package available. With 2.11 they get TLS session ticket support in the Postfix SMTP server and DANE support in the Postfix SMTP client. Best-practice configuration: Postfix configured for opportunistic TLS or opportunistic DANE TLS if >= 2.11.0: /etc/postfix/main.cf: # Server TLS smtpd_tls_security_level = may smtpd_tls_loglevel = 1 smtpd_tls_cert_file = ${config_directory}/smtpd-chain.pem smtpd_tls_key_file = ${config_directory}/smtpd-key.pem smtpd_tls_dh1024_param_file ${config_directory}/dh2048.pem smtpd_tls_dh512_param_file ${config_directory}/dh512.pem # Client TLS: Postfix < 2.11 smtp_tls_security_level = may smtpd_tls_loglevel = 1 # In most cases do not configure a client certificate smtp_tls_cert_file = smtp_tls_key_file = # Client TLS additions/changes for Postfix >= 2.11 smtp_dns_support_level = dnssec smtp_tls_security_level = dane For DANE security, a DNSSEC-validating recursive resolver is required on the MTA machine, as the sole entry in: /etc/resolv.conf: domain amsl.com nameserver 127.0.0.1 -- Viktor.
- [dane] Meeting at IETF89 (London). Warren Kumari
- Re: [dane] Meeting at IETF89 (London). Viktor Dukhovni
- Re: [dane] Meeting at IETF89 (London). Warren Kumari
- Re: [dane] Meeting at IETF89 (London). Peter Saint-Andre
- Re: [dane] Meeting at IETF89 (London). Olaf Kolkman
- Re: [dane] Meeting at IETF89 (London). Viktor Dukhovni
- Re: [dane] Meeting at IETF89 (London). Wes Hardaker