SSH to machines from add-user

Rick Harding rick.harding at canonical.com
Fri May 11 12:25:09 UTC 2018


I worked with Tom on this in IRC and got to the bottom of it. We hit a
corner case of the superuser. The folks that own the controller themselves
are a bit special. While technically they're the boss and can juju status
any model in the controller, they don't see all the models by default in
juju models and the like. It'd make being the controller admins a real
pain.

Likewise, we don't auto add the ssh key of every superuser to every machine
in every model regardless of the owner. We take the tact that supserusers
can sudo around and do anything, but by default commands only allow them to
do things on models they've been given model level access to directly.

Tom was setting up a controller, adding a user, and granting them superuser
on the controller. However, as the user had no direct share/access to the
model in question it could not ssh to the machines in the model.

I think we can be more clear here around the error messaging as we know the
user is a superuser and why the request failed.

On Fri, May 11, 2018 at 6:11 AM Tom Barber <tom at spicule.co.uk> wrote:

> Hello folks
>
> IRC has failed me so lets try the wider world.
>
> We have a multinode manual cloud deployed. We have juju add-user 2 new
> users and also juju add-ssh-key for those users.
>
> We know the ssh key works because
>
> ssh ubuntu@<host>
>
> works fine and we can sudo -i etc and do stuff.
>
> But
>
> juju ssh <machine number>
>
> says:
>
> ERROR permission denied (unauthorized access)
> 11:05:18 DEBUG cmd supercommand.go:459 error stack:
> permission denied (unauthorized access)
> github.com/juju/juju/rpc/client.go:149:
> github.com/juju/juju/api/apiclient.go:924:
> github.com/juju/juju/api/sshclient/facade.go:109:
> github.com/juju/juju/cmd/juju/commands/ssh_common.go:257:
> github.com/juju/juju/cmd/juju/commands/ssh_common.go:141:
> github.com/juju/juju/cmd/juju/commands/ssh.go:117:
>
> I've looked at the code and it claims we can
>
> juju ssh ubuntu@<machine number> -i <key>
>
> that fails with the same error.
>
> If I tail the target servers auth.log there isn't even a failed login
> attempt which strikes me as a little weird considering it says
>
> permission denied (unauthorized access)
>
> Which does make me question... what permission is denied?
>
>
> --
>
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