Re: Fedora 32 System-Wide Change proposal: Disallow Empty Password By Default

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On Mon, 2019-12-02 at 18:16 +0000, Zbigniew Jędrzejewski-Szmek wrote:
> On Mon, Dec 02, 2019 at 10:44:46AM -0700, John M. Harris Jr wrote:
> > On Monday, December 2, 2019 9:48:05 AM MST Przemek Klosowski via devel wrote:
> > > On 11/27/19 2:59 AM, Zbigniew Jędrzejewski-Szmek wrote:
> > > > On Tue, Nov 26, 2019 at 09:39:59AM -0700, Chris Murphy wrote:
> > > > > Mayyyybee systemd-homed is in
> > > > > a position to solve this by having early enough authentication
> > > > > capability by rescue.target time that any admin user can login?
> > > > 
> > > > Actually, it may. Things are confusing here, because systemd-homed is
> > > > implemented together with changes to how user metadata querying is done:
> > > > instead of using dbus, a brokerless and much simpler varlink query is
> > > > used.
> > > > That last part is what would be relevant to early-boot logins, because
> > > > less services need to be up to bring up the user session.
> > > 
> > > There's one tricky feature of homed : remote login (ssh) is only
> > > possible after an initial local login. It is OK for his intended use (a
> > > personal laptop/tablet client), except for corner cases like a remotely
> > > accessed personal desktop in the basement that might get rebooted e.g.
> > > for updates, resulting in an accidental lockout.
> > 
> > Basically, systemd-homed is useless for any power user, but might be useful 
> > for people just getting into GNU/Linux, who don't use ssh yet or don't have 
> > more than one system.
> 
> How often do you ssh *into* your laptop?
Actually all the time - my (personal home) laptop is where my hobby projects
live, where various SSH private keys are, etc. So I SSH there to connect to another
machine using the SSH keys, to work an my hobby projects from a workstation computer
at home, etc.

And this is just "human" SSH sessions, various automated rsync/scp connections might
happen as well.

>  I occasionally do, but more
> because I can than because I really need to. systemd-homed is most
> suited for the case of a portable personal device, and this is exactly
> the type of device one is relatively unlikely to access from the
> network. So I don't think this limitation is so terrible.
> 
> Nevertheless, I'm pretty sure that a workaround for this will be made
> anyway. I think the latest version of the patchset allows exporting
> the authorized_keys content in the non-encrypted metadata for the user.
> 
> Zbyszek
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