[bug#27394] [PATCH] gnu: tor: Add seccomp support.

[ng0 <ng0@infotropique.org>]

There's a problem. I think it's not that problematic but it's a problem:

Activating the Sandbox option (torrc Sandbox 1) prevents reloading
certain functions of tor without stopping tor. Now when you do this
with our GuixSD tor-service running through a guix system reconfigure,
you will get a sandbox violation. Because I reboot directly after
reconfigure I don't know if this is a serious problem, but I know
there are plans for system-generation activation or what they call
it (switch to the newly generated system directly after it was build).

After a day of using your patch and encountering the sandbox violations
I'm positive it works as intended, but I'm not sure what to do about
the switch. Maybe our tor-service has to be adjusted? This is no
requirement for this to be merged, I'm just trying to point out details.
ng0 transcribed 1.8K bytes:
> The patch itself seems to work.
> 
> Just introducing upstream explicitly marked (see 'man tor') as "experimental"
> features is difficult. As long as nothing breaks it's okay I guess.
> 
> Should tor or the GuixSD native tor-service start to consume too much
> resources, we can still adjust.
> 
> ng0 transcribed 2.3K bytes:
> > Rutger Helling transcribed 2.6K bytes:
> > > Hey ng0, 
> > > 
> > > I think that ticket references whether the default torrc should have
> > > "Sandbox 1".
> > 
> > I understood the Whonix mail, which is how I got to the trac of tor,
> > in the way that they don't enable seccomp because tor does not enable
> > it as default. I'm not 100% positive on this, but I think I used
> > tor with +seccomp and hardening in Gentoo for a very long time.
> > 
> > 
> > > This patch doesn't do that, you still have to set that
> > > manually if you want to use it. It only gives you the option (Tor will
> > > just ignore that option in Guix right now). 
> > > 
> > > I also don't think that hardening and the sandbox bite each other in any
> > > way. 
> > > 
> > > On 2017-06-16 14:01, ng0 wrote:
> > > 
> > > > Rutger Helling transcribed 2.5K bytes: 
> > > > 
> > > >> Hello, 
> > > >> 
> > > >> this patch adds seccomp support to tor.
> > > > 
> > > > There's the question if we would want that.
> > > > tor doesn't enable it by default, see: https://trac.torproject.org/projects/tor/ticket/19215
> > > > But we also enable hardening by default, which differs from the tor default.
> > > > I have no problem with moving unstable features in, but hardening
> > > > seems much more tested to me than seccomp.
> > 
> > -- 
> > ng0
> > OpenPG: A88C8ADD129828D7EAC02E52E22F9BBFEE348588
> > https://krosos.org/~/ng0/ https://www.infotropique.org
> 
> 
> 
> -- 
> ng0
> OpenPG: A88C8ADD129828D7EAC02E52E22F9BBFEE348588
> https://krosos.org/~/ng0/ https://www.infotropique.org
> 
> 
> 
> 

-- 
ng0
OpenPG: A88C8ADD129828D7EAC02E52E22F9BBFEE348588
https://krosos.org/~/ng0/ https://www.infotropique.org