Re: [Extra] Ben Campbell's Discuss on draft-ietf-extra-sieve-fcc-08: (with DISCUSS and COMMENT)

Alexey Melnikov <aamelnikov@fastmail.fm> Thu, 10 January 2019 15:15 UTC

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From: Alexey Melnikov <aamelnikov@fastmail.fm>
To: Ben Campbell <ben@nostrum.com>
Cc: extra@ietf.org, yaojk@cnnic.cn, draft-ietf-extra-sieve-fcc@ietf.org, The IESG <iesg@ietf.org>, extra-chairs@ietf.org
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Date: Thu, 10 Jan 2019 15:14:59 +0000
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Subject: Re: [Extra] Ben Campbell's Discuss on draft-ietf-extra-sieve-fcc-08: (with DISCUSS and COMMENT)
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Hi Ben,

On Thu, Jan 10, 2019, at 2:56 PM, Ben Campbell wrote:
> 
> 
> > On Jan 10, 2019, at 2:42 AM, Alexey Melnikov <aamelnikov@fastmail.fm>; wrote:
> > 
> > Hi Ben,
> > 
> >> On 9 Jan 2019, at 21:51, Ben Campbell <ben@nostrum.com>; wrote:
> >> 
> >> ----------------------------------------------------------------------
> >> DISCUSS:
> >> ----------------------------------------------------------------------
> >> 
> >> Thanks for the work on this. I plan to ballot "yes", but have one item I think
> >> needs to be discussed first:
> >> 
> >> The security considerations say that this extension adds no new considerations
> >> not already present in [RFC5228], [RFC5230], [RFC5435], and [RFC6131]. I'm not
> >> sure that that is true.
> >> 
> >> It seems like the ability to insert a copy of message into a mailbox might have
> >> security and/or privacy considerations.
> > 
> > Can you give me an idea of what you have in mind here, other than putting the user (Sieve script owner) over quota?
> 
> I can’t say that I know what the security considerations might be; I’m 
> just skeptical that the answer is “no new considerations." The authors 
> of 5228 thought “fileinto” could be dangerous. Do we know why?

I don't remember now, even though I participated in the discussion.

> > In particular, what are the possible privacy implications?
> 
> Could there be issues with, say, shared mailboxes?

Possibly. I can write something about this.

> Or storing cleartext for mail that would be sent encrypted?

I can't think of how this is going to be possible. Sieve notifications/vacation replies can disclose private information from Sieve script owner, but storing such messages doesn't leak any more information (ignore shared folders, I agree this might be an issue), because such messages will be stored in one of owner's mailboxes .

> I suspect the answers may be more IMAP related than sieve related, but 
> even that might suggest citing something IMAP related.

Best Regards,
Alexey