Re: [Uta] REQUIRETLS: another SMTP TLS mechanism

2016-03-25 Thread Aaron Zauner
> On 25 Mar 2016, at 03:12, Jim Fenton wrote: > > Not to distract from the STS discussion, but I thought I'd point out > another approach to SMTP TLS 'encouragement' that I submitted a few > weeks ago: draft-fenton-smtp-require-tls-01. There has been some > discussion of this draft, primarily on

Re: [Uta] REQUIRETLS: another SMTP TLS mechanism

2016-03-25 Thread Jeremy Harris
On 25/03/16 12:09, Aaron Zauner wrote: >> On 25 Mar 2016, at 03:12, Jim Fenton wrote: >> REQUIRETLS is an SMTP service extension that allows an SMTP client to >> specify (via a MAIL FROM option) that a given message must be sent over >> a TLS protected session with specified security characteristi

Re: [Uta] REQUIRETLS: another SMTP TLS mechanism

2016-03-25 Thread Jeremy Harris
On 25/03/16 02:12, Jim Fenton wrote: > draft-fenton-smtp-require-tls-01 > The idea here is that REQUIRETLS allows the SMTP client to override the > default "deliver even if you can't do it securely" behavior of SMTP. The > philosophy is that the sender of the message (SMTP client) is in the > bes

Re: [Uta] REQUIRETLS: another SMTP TLS mechanism

2016-03-25 Thread John Levine
>- The draft does not mention alias-style forwarding done by an MTA; > perhaps it could? A 1-1 alias would seems to be easily covered, > but 1-to-many (mail-exploder) aliases may need more thought. The whole draft presumes that intermediate hops will follow instructions from the sender, without

Re: [Uta] REQUIRETLS: another SMTP TLS mechanism

2016-03-25 Thread Orit Levin (CELA)
Thank you, Jim. Definitely should be a part of the conversation. You are on the Agenda! Orit. > -Original Message- > From: Uta [mailto:uta-boun...@ietf.org] On Behalf Of Jim Fenton > Sent: Thursday, March 24, 2016 7:13 PM > To: uta@ietf.org > Subject: [Uta] REQUIRETLS: another SMTP TLS mec

Re: [Uta] REQUIRETLS: another SMTP TLS mechanism

2016-03-25 Thread Viktor Dukhovni
On Thu, Mar 24, 2016 at 07:12:43PM -0700, Jim Fenton wrote: > Not to distract from the STS discussion, but I thought I'd point out > another approach to SMTP TLS 'encouragement' that I submitted a few > weeks ago: draft-fenton-smtp-require-tls-01. There has been some > discussion of this draft, pr

Re: [Uta] REQUIRETLS: another SMTP TLS mechanism

2016-03-25 Thread Jim Fenton
On 03/25/2016 06:45 AM, Jeremy Harris wrote: > On 25/03/16 12:09, Aaron Zauner wrote: >>> On 25 Mar 2016, at 03:12, Jim Fenton wrote: >>> REQUIRETLS is an SMTP service extension that allows an SMTP client to >>> specify (via a MAIL FROM option) that a given message must be sent over >>> a TLS prot

Re: [Uta] REQUIRETLS: another SMTP TLS mechanism

2016-03-25 Thread Jim Fenton
On 03/25/2016 07:24 AM, Jeremy Harris wrote: > On 25/03/16 02:12, Jim Fenton wrote: >> draft-fenton-smtp-require-tls-01 >> The idea here is that REQUIRETLS allows the SMTP client to override the >> default "deliver even if you can't do it securely" behavior of SMTP. The >> philosophy is that the s

Re: [Uta] REQUIRETLS: another SMTP TLS mechanism

2016-03-25 Thread Jim Fenton
On 03/25/2016 11:24 AM, Viktor Dukhovni wrote: > On Thu, Mar 24, 2016 at 07:12:43PM -0700, Jim Fenton wrote: > >> Not to distract from the STS discussion, but I thought I'd point out >> another approach to SMTP TLS 'encouragement' that I submitted a few >> weeks ago: draft-fenton-smtp-require-tls-0

Re: [Uta] New proposal: SMTP Strict Transport Security

2016-03-25 Thread Chris Newman
On March 23, 2016 at 18:45:45 , Daniel Margolis (dmargo...@google.com) wrote: Hey,  Of course we reviewed DEEP during the drafting process, but as you say, the targets are slightly different. I've responded to some individual points inline; in summary, though, I think you raise some actionable p

Re: [Uta] REQUIRETLS: another SMTP TLS mechanism

2016-03-25 Thread Viktor Dukhovni
On Fri, Mar 25, 2016 at 12:35:02PM -0700, Jim Fenton wrote: > > If the entire goal is to ensure the integrity of the RFC 6125 > > "reference identifier" used to authenticate the nexthop SMTP > > server, then it is perhaps a good idea to say so explicitly. > > The primary purpose was i

Re: [Uta] New proposal: SMTP Strict Transport Security

2016-03-25 Thread Chris Newman
On March 24, 2016 at 2:16:27 , Mark Risher (ris...@google.com) wrote: Hi, Chris: Thanks for the comments.   1. I personally dislike using DNS records for any of this proposal. I believe SMTP security policy is best communicated within SMTP as this minimizes attack surface, eliminates the need for

Re: [Uta] REQUIRETLS: another SMTP TLS mechanism

2016-03-25 Thread Chris Newman
On March 24, 2016 at 12:42:07 , Jim Fenton (fen...@bluepopcorn.net) wrote: Not to distract from the STS discussion, but I thought I'd point out  another approach to SMTP TLS 'encouragement' that I submitted a few  weeks ago: draft-fenton-smtp-require-tls-01. There has been some  discussion of this

Re: [Uta] New proposal: SMTP Strict Transport Security

2016-03-25 Thread Chris Newman
On March 25, 2016 at 15:15:22 , Mark Risher (ris...@google.com) wrote: The discussion around whether to include a timeout in DEEP was basically to ask the question: Should a domain that makes a commitment to be secure be allowed to revoke that commitment? The rough consensus in the face-to-face m