[Pkg-shadow-devel] Bug#768020: Bug#768020: Missing /dev/ttySC* entries in /etc/securetty

Mike Frysinger vapier at gentoo.org
Wed Nov 5 18:30:54 UTC 2014

On 05 Nov 2014 17:35, Geert Uytterhoeven wrote:
> On Wed, Nov 5, 2014 at 4:49 PM, Mike Frysinger wrote:
> >> > perhaps the default should be to not have an /etc/securetty at all ?  if the
> >> > system is configured to launch getty on a tty, then in today's world, it means
> >> > it's a local device right ?  if you have physical access to something, and know
> >>
> >> It may still be connected to a modem, waiting for incoming calls...
> >
> > how many of these systems legitimately exist anymore ?  we shouldn't be
> > handicapping the majority of users for an extreme edge case.  if those people
> > want to set up securetty, they can create the file themselves.
> >
> >> > the root password, what exactly is this protecting the system from ?
> >>
> >> /etc/securetty is not meant to prevent privileged people from getting in,
> >> but to protect the system against eavesdropping on unsecure lines
> >> (.e.g. out-of-the-building serial cables and modem lines).
> >
> > how does securetty prevent that ?  you can log in as non-root and then sudo.  or
> > try and leverage a known security vuln to escalate that non-root account.  any
> > perceived security provided by securetty is an illusion.
> Ah, sudo is a recent invention ;-)

`su` isn't though, and i don't think `su` enforces securetty ?  it's only at 
`login` time ?

> But you're right, /etc/securetty has little value these days.

i guess this is something we need to encourage each distro to do as i don't 
think the upstream shadow package already ships this behavior by default.  i'll 
update Gentoo after i double check the behavior and see if anyone notices :).
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