Re: [Alsa-user] How can I prevent change owner of /dev/snd/* after gnome session login

[John H. <jc...@th...>]

Lee Revell wrote:

>On Thu, 2004-09-30 at 15:48, Rocky Zhang wrote:
>  
>
>>Hi John,
>>
>>You're right. I commented out the lines "sound" in
>>/etc/security/console.perms, and it works. As you said, if I set
>>permission by group, I must specify users to belong to the group. I'd
>>like to change the audio owner to specific end user (different audio
>>device ownered by different user), here still some problem: normal end
>>user can't change owner of others file, I must use "sudo" command to do
>>it (it's also a headache for me). No good solution so far.
>>
>>    
>>
>
>Then please report this as a Fedora bug.  It is not an ALSA problem, but
>a distro problem.
>  
>
Well, I think "bug" is a bit strong.   Enhancement request perhaps.   
The console.perms stuff allows for users to have access to special files 
(eg /dev/fd0, /dev/snd/*, stuff like that) when the log in to the 
console or an x-console.   That's because when you're logged in to the 
console you have physical access to the machine so you're given access 
to some physical resources (floppy, sound, cdrom and whatnot) associated 
with the machine.    What Rocky wants, I think, is to extend that to 
allow a different class of user with physical access to have physical 
access to a different set of physical resources.

I'm really not sure how to achieve this with the current framework -- 
there's a not unreasonable assumption that there's only one user with 
physical access to the machine.   I think I'd be inclined to take the 
easy way out -- specifically exclude the USB sound device from 
console.perms and fix the permissions of that to allow anyone access who 
is in the right group.   It's not perfect by any means, but probably 
doable in a reasonable time.   The only downside is that anyone in the 
right group can get to the sound device, usually by accident.   That's 
the downside with the debian scheme as well: once you have access, 
you've got it all the time, regardless of who actually has the 
headphones one.

jch

jch