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

Ben Campbell <ben@nostrum.com> Thu, 10 January 2019 15:29 UTC

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From: Ben Campbell <ben@nostrum.com>
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Date: Thu, 10 Jan 2019 09:29:03 -0600
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Cc: extra@ietf.org, yaojk@cnnic.cn, draft-ietf-extra-sieve-fcc@ietf.org, The IESG <iesg@ietf.org>, extra-chairs@ietf.org
To: Alexey Melnikov <aamelnikov@fastmail.fm>
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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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> On Jan 10, 2019, at 9:14 AM, Alexey Melnikov <aamelnikov@fastmail.fm> wrote:
> 
> 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 .

Doesn’t that make the safety of storing the message dependent on having reasonable protections for the 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

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