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From Jeff Trawick <traw...@gmail.com>
Subject Re: [mod_fcgid PATCH] don't try to change ownership of socket directory unless running as root
Date Mon, 11 May 2009 21:34:07 GMT
On Mon, May 11, 2009 at 4:26 PM, Joe Orton <jorton@redhat.com> wrote:

> On Mon, May 11, 2009 at 11:56:42AM -0400, Jeff Trawick wrote:
> > Currently, starting httpd as non-root with mod_fcgid loaded fails unless
> > User/Group are set to the active User/Group.  Normally, httpd modules
> don't
> > try to set ownership of objects to the specified User/Group unless
> starting
> > as root.  Thus, httpd.conf can contain reasonable User/Group settings for
> > production use but still be suitable for use by Joe User.
> > The affected code in fcgid_pm_unix.c is from the original revision (
> >
> http://svn.apache.org/viewvc/httpd/mod_fcgid/trunk/mod_fcgid/arch/unix/fcgid_pm_unix.c?revision=753487&view=markup
> > ).
> >
> > Logic was added a couple of years ago (
> > http://svn.apache.org/viewvc?view=rev&revision=753553) to bypass the
> > directory creation/chown if the directory already existed and had the
> > correct ownership, to allow use with some SELinux policy.
> >
> > Comments/concerns?
>
> I bumped into problems with this when I tried the Fedora package of
> mod_fcgid recently, but got scared off when I started reading the code.
>
>
It seems that there's a lot to understand ;)

The only requirement on the directory is that root can create
> sockets in the directory, and the less-privileged user can open those
> sockets, right?


Close.  The startup user (root) creates the directory and sets permissions
to 0700.  The child user (e.g., webservd) creates the sockets and connects
to them.  (A pipe is used for communication as well.  I think there's a unix
socket per application instance.)

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