$local and user change

$local and user change

[Gioele Barabucci]

The $local change is nice, but I have one question about it:

user "joe" plugs his usbkey (or pccard) and use it.
Then logs out and "jack" logs in. Jack can't use the key (correctly owned by 
"joe", other users should not be able to read it) and can't even remove it 
(need to umount to avoid hw problems).

How should one solve this problem?

--
Gioele


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Re: $local and user change

[Greg KH]

On Wed, Mar 03, 2004 at 01:37:03PM +0100, Gioele Barabucci wrote:
> The $local change is nice, but I have one question about it:
> 
> user "joe" plugs his usbkey (or pccard) and use it.
> Then logs out and "jack" logs in. Jack can't use the key (correctly owned by 
> "joe", other users should not be able to read it) and can't even remove it 
> (need to umount to avoid hw problems).
> 
> How should one solve this problem?

Not use the $local rule for such a device?  :)

Seriously, it sounds like you should just give the device write access
to a specific group of users, which is much easier to do.

thanks,

greg k-h


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Re: $local and user change

[Gioele Barabucci]

On Wednesday 03 March 2004 19:37, Greg KH wrote:
> > [usbkey]
> > How should one solve this problem?
>
> Not use the $local rule for such a device?  :)
>
> Seriously, it sounds like you should just give the device write access
> to a specific group of users, which is much easier to do.
The same problem remains even with groups (if I want the usbkey only by the 
owner).
I don't see how chgrp'ing the device can be useful...

--
Gioele


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Re: $local and user change

[Greg KH]

On Wed, Mar 03, 2004 at 09:08:46PM +0100, Gioele Barabucci wrote:
> On Wednesday 03 March 2004 19:37, Greg KH wrote:
> > > [usbkey]
> > > How should one solve this problem?
> >
> > Not use the $local rule for such a device?  :)
> >
> > Seriously, it sounds like you should just give the device write access
> > to a specific group of users, which is much easier to do.
> The same problem remains even with groups (if I want the usbkey only by the 
> owner).
> I don't see how chgrp'ing the device can be useful...

You are saying that you want a range of users to be able to use the
device, right?  Either put them all in the same group, or run some
script at login/logout time, or have them unplug and replug the device.

thanks,

greg k-h


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Re: $local and user change

[Robert Love]

On Wed, 2004-03-03 at 07:37, Gioele Barabucci wrote:

> The $local change is nice, but I have one question about it:
> 
> user "joe" plugs his usbkey (or pccard) and use it.
> Then logs out and "jack" logs in. Jack can't use the key (correctly owned by 
> "joe", other users should not be able to read it) and can't even remove it 
> (need to umount to avoid hw problems).
> 
> How should one solve this problem?

You need to use something like pam_console to change certain device
nodes at login/logout.

With udev, we need both solutions (a login/logout solution and a dynamic
solution like $local).

	Robert Love




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