Re: Is support being removed for ordinary users to run sshd?

[Date Prev] [Date Next] [Thread Prev] [Thread Next] [Date Index] [Thread Index]

 



-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hello Darren,

Thank you for the explanation. As long as a non-privileged user
can run sshd (listening on a high-numbered port), my application
is OK.

SSH is a great tool for those of us concerned about privacy. Your
work is really appreciated!

Jack

Darren Tucker <dtucker@xxxxxxxxxx> wrote:
> On Tue, Mar 28, 2017 at 2:23 AM, Jack Dodds
> <brmdamon@xxxxxxxxxxxx> wrote:
> 
> > Hello Darren,
> >
> > Could you comment on this issue being raised by myself and
> > Corinna Vinschen?
> >
> > This will create big problems for me.
> >
> > I'm not clear if this is a conscious decision supported by solid
> > reasons or if it is just collateral damage.
> >
> > Thank you for all you work!
> >
> > Jack DoDDs
> >
> > -------- Original Message --------
> > Date: Mon, 27 Mar 2017 16:31:03 +0200
> > Subject: Re: Announce: OpenSSH 7.5 released
> > From: Corinna Vinschen <vinschen@xxxxxxxxxx>
> > To: openssh-unix-dev@xxxxxxxxxxx
> >=
> > On Mar 24 12:38, Jack Dodds wrote:
> > > Hello,
> > >
> > > You seem to be saying that in 7.5, sshd can no longer be run
> > > under an ordinary user account. Is that accurate?
> >
> > Well, yes, that's what the report claims, and it seems correct to
> > me.
> >
> 
> It's not quite accurate. The issue is that it checks for the
> existence of the privsep user and directory even though it does
> not use them. If they exist (even if only because you
> configure'ed --with-privsep-user and --with-privsep-dir to
> point to other existing ones) then it'll work. This is what we
> use for the regression tests when SUDO is not set (but because
> all our test systems have the user and dir, we never observed
> the problem).
> 
> 
> > > I use sshd running under a user account in Debian Jessie to allow
> > > tunnels from remote devices. That capability is crucial to my
> > > application.
> > >
> > > Any comments would be appreciated.
> >
> > Same here.
> >
> > Is it really just a bug or is the "non-priv'ed user running sshd"
> > scenario going to be unsupported in future?
> >
> 
> My opinion:
>  - running as a non-privileged user should be supported.
>  - running with privsep disabled (ie one unprivileged process) will not be
> supported.
> 
> This will mean that you'll have two sshd processes per
> connection running as an unprivileged user, same as you would
> for a privileged user.
> 
> Rationale: we want to reduce the code complexity by removing
> the !privsep code paths, and some privilege dropping mechanisms
> like OpenSBD's pledge can still be employed by unprivileged
> code).
> 
> I've just committed a variation on the patch to both HEAD and
> the 7.5 branch.
> 
> https://anongit.mindrot.org/openssh.git/commit/?id=d13281f2964abc5f2e535e1613c77fc61b0c53e7
>

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1

iQEcBAEBAgAGBQJY2xywAAoJEChpvIQG4DsHRngIAIFlboNrrJ8dKoOSFOex6lIy
dwH92dF3gsIdHB2Uuya8UElfi+fHl1Rypc3ToDT53lbGJTI3N/ERY7VK5vs69UFz
BlKQ8tD+E43VBmM6dqWAIXY2t+DDdOn/pg1zC8sWIxoH/YvKGUp+dqMIHpnjnVyQ
DKxQUiv+ygXapJGaNwIe8lFicdxyqerwxXJX9gwbs73iTTEK7sfqK9WGoTox5yqN
PORJi73zmjBastFKvO+wDM4F+5xXtX4cH9eufNa/eAouZpIVpUut5MwGbL0LDVNL
8jeolgLZMx/dnBpgy8eezUXnF6e41k0y7Iw0LFmzCYHBGQ82lyn4TxV/BG/+QrQ=
=B/Dp
-----END PGP SIGNATURE-----
_______________________________________________
openssh-unix-dev mailing list
openssh-unix-dev@xxxxxxxxxxx
https://lists.mindrot.org/mailman/listinfo/openssh-unix-dev



[Date Prev] [Date Next] [Thread Prev] [Thread Next] [Date Index] [Thread Index]

[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Security]     [Bugtraq]     [Linux]     [Linux OMAP]     [Linux MIPS]     [ECOS]     [Asterisk Internet PBX]     [Linux API]

  Powered by Linux