idea - running setfiles out of inetd!

idea - running setfiles out of inetd!

[Luke Kenneth Casson Leighton]

okay, this may sound a bit mad.

i'm trying to think of simple ways to speed up udev, amongst other
things.

i'd like to canvas people's opinions of running
"setfiles -q -s /etc/selinux/contexts/file_contexts" from inetd 
on a unix-domain-socket, or a tcpwrapper or _something_ that will
get it to listen on its stdin for filenames to restore contexts
on.

the alternative is, in the case of udev, to merge the functionality
of udevd and udevsend, such that the file context cacheing can
be taken advantage of.

at present, udevd execv's a new udevsend on each and _every_ device.

thoughts anyone?

l.

-- 
--
Truth, honesty and respect are rare commodities that all spring from
the same well: Love.  If you love yourself and everyone and everything
around you, funnily and coincidentally enough, life gets a lot better.
--
<a href="http://lkcl.net">      lkcl.net      </a> <br />
<a href="mailto:lkcl@lkcl.net"> lkcl@lkcl.net </a> <br />



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Re: idea - running setfiles out of inetd!

[Russell Coker]

On Wed, 18 Aug 2004 05:47, Luke Kenneth Casson Leighton <lkcl@lkcl.net> wrote:
> i'd like to canvas people's opinions of running
> "setfiles -q -s /etc/selinux/contexts/file_contexts" from inetd

Bad idea, anyone can call it.

> the alternative is, in the case of udev, to merge the functionality
> of udevd and udevsend, such that the file context cacheing can
> be taken advantage of.

What if udev spawns "setfiles -q -s" and then sends the file names down the 
pipe to it only closing the pipe after a certain time period of no new nodes?

-- 
http://www.coker.com.au/selinux/   My NSA Security Enhanced Linux packages
http://www.coker.com.au/bonnie++/  Bonnie++ hard drive benchmark
http://www.coker.com.au/postal/    Postal SMTP/POP benchmark
http://www.coker.com.au/~russell/  My home page


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Re: idea - running setfiles out of inetd!

[Luke Kenneth Casson Leighton]

On Wed, Aug 18, 2004 at 07:56:46PM +1000, Russell Coker wrote:
> On Wed, 18 Aug 2004 05:47, Luke Kenneth Casson Leighton <lkcl@lkcl.net> wrote:
> > i'd like to canvas people's opinions of running
> > "setfiles -q -s /etc/selinux/contexts/file_contexts" from inetd
> 
> Bad idea, anyone can call it.

 i've done root-only-accessible unix domain socket stuff before now,
 it's necessary to create a directory which is 0500 and then inside
 that the socket is 0600 [some unixen don't support permissions on
 sockets]

> > the alternative is, in the case of udev, to merge the functionality
> > of udevd and udevsend, such that the file context cacheing can
> > be taken advantage of.
> 
> What if udev spawns "setfiles -q -s" and then sends the file names down the 
> pipe to it only closing the pipe after a certain time period of no new nodes?
 
 okay, cool...

 so.... hey yes, of course.

 yes, so that could be run from the main udev process, i get it.
 
 and you exec each udevstart to create the file name, and then
 send the same filename down to the "setfiles -q -s".

 is using popen() okay to do that?

 what implications [on policy writing and also security]
 will it have to be running setfiles from inside udev
 (bearing in mind that popen involves a pipe and a fork)


 ... darn!  how many programs has udev been split into??? :)



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Re: idea - running setfiles out of inetd!

[Russell Coker]

On Thu, 19 Aug 2004 02:04, Luke Kenneth Casson Leighton <lkcl@lkcl.net> wrote:
> > What if udev spawns "setfiles -q -s" and then sends the file names down
> > the pipe to it only closing the pipe after a certain time period of no
> > new nodes?
>
>  okay, cool...
>
>  so.... hey yes, of course.
>
>  yes, so that could be run from the main udev process, i get it.
>
>  and you exec each udevstart to create the file name, and then
>  send the same filename down to the "setfiles -q -s".

Yes.

>  is using popen() okay to do that?

Should be.

>  what implications [on policy writing and also security]
>  will it have to be running setfiles from inside udev
>  (bearing in mind that popen involves a pipe and a fork)

Nothing significant.  I don't think we'll have a domain transition (don't want 
it to relabel arbitrary files), just have it run in udev_t (which should 
already have most if not all the access needed for this.

-- 
http://www.coker.com.au/selinux/   My NSA Security Enhanced Linux packages
http://www.coker.com.au/bonnie++/  Bonnie++ hard drive benchmark
http://www.coker.com.au/postal/    Postal SMTP/POP benchmark
http://www.coker.com.au/~russell/  My home page


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