Re: [tor-dev] Proposal 334: A flag to mark Relays as middle-only

[ezhigp]

 Original Message 
From: Neel Chauhan 
Apparently from: tor-dev-boun...@lists.torproject.org
To: tor-dev@lists.torproject.org
Subject: Re: [tor-dev] Proposal 334: A flag to mark Relays as middle-only
Date: Fri, 17 Sep 2021 16:09:43 -0700

> Hi nusenu (and tor-dev@),
> 
> On 2021-09-17 16:02, nusenu wrote:
> > it would be great if you could open a MR for the proposal so we can
> > always see the latest version and changes
> > there.
> > (Over time it became unclear what comments have already been addressed
> > in the text an which didn't.)
> 
> Done: https://gitlab.torproject.org/tpo/core/torspec/-/merge_requests/46
Line 102> single directory authority servre [3].
Typo here.
> 
> > kind regards,
> > nusenu
> 
> -Neel
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Re: [tor-dev] Proposal 335: An authority-only design for MiddleOnly

[ezhigp]

> ```
> Filename: 335-middle-only-redux.md
> Title: An authority-only design for MiddleOnly
> Author: Nick Mathewson
> Created: 2021-10-08
> Status: Open
> ...
> 
> These flags SHOULD be set in a vote whenever `MiddleOnly` is
> present, and only when the authority is configured to vote on the
> `BadExit` flag.
> 
>   * `BadExit`
> 
> These flags SHOULD be cleared in a vote whenever `MiddleOnly` is
> present.
> 
>   * `Exit`
I believe that BadExit is supposed to be given together with Exit, to mark that 
technically it's possible to exit from this relay, but it is not recommended 
unless you know what you do.
>   * `Guard`
>   * `HSDir`
>   * `V2Dir`
It looks like we don't fear such a relay at Intro?
Or it is a sign that this proposal is only a set of quick actions before #334?
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[tor-dev] Proposal 334: A flag to mark Relays as middle-only

[ezhigp]

Neel Chauman wrote at Sun Sep 12 19:17:37 UTC 2021:
>my updated proposal 
>says that if one dirauth gives a relay the MiddleOnly flag, then it's 
>set for that relay. This is to prevent harm while all (or the majority 
>of) dirauths give the relay that flag.

Imagine one hostile dirauth that votes for this flag on every relay it cannot 
control. Guessing the result is left as an exercise to the reader :).



(Spoiler: IIUC, this will result in using only attacker-controlled relays as 
entries and exits, resulting in both-ends control of all external and hidserv 
circuits).
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