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From: Peter Oliver
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Subject: bug#66667: [PATCH] Socket forwarding in emacsclient --tramp-prefix
example
Date: Mon, 8 Apr 2024 12:26:59 +0100 (BST)
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On Sun, 22 Oct 2023, Peter Oliver wrote:
> On Sun, 22 Oct 2023, Björn Bidar wrote:
>
>>> @ example
>>> -local$ ssh -R12345:localhost:12345 remote
>>> -remote$ export EDITOR="emacsclient \
>>> - --server-file=server \
>>> - --tramp=/ssh:remote:"
>>> +local$ ssh -R
>>> "/tmp/emacs-%r.socket":"$@{XDG_RUNTIME_DIR:-$@{TMPDIR:-/tmp@}/emacs%i@}$@{XDG_RUNTIME_DIR:+/emacs@}/server"
>>> remote
>>> +remote$ export EMACS_SOCKET_NAME=/tmp/emacs-$USER.socket
>>
>> If the host has run /run/user it would make sense to setup the Emacs
>> socket inside this directory.
>> On older systems this might be /var/run/user I think.
>
> It would, sure, but you can’t in general tell from the local side whether the
> remote side has /run, nor what your UID is there. You’d need an extra round
> trip, for which you need ssh’s ControlPersist option to make performant.
> This is too complicated for a simple example.
>
>> If the socket fie is in /tmp every other user can read it, using /run/user
>> is
>> more secure.
>
> No, the socket will have permissions 0700, so other users won’t be able to
> read it. The risk is that other users will be able to cause a nuisance by
> creating a file of the same name in its place. Perhaps it’s better to
> suggest putting the socket in the user’s home directory (which I originally
> discounted in case of shared NFS home directories)?
Here is an update patch that does that.
I’m not sure why this bug was closed already.
--
Peter Oliver
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