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From osishkin osishkin <osish...@gmail.com>
Subject [users@httpd] Apache and daemon capabilities
Date Mon, 10 May 2010 14:45:45 GMT
Hi,

I'm trying to use Apache for a file service, with multiple processes.
I want to get user file permissions from the OS itself, by
setfsuid-ing every time  of the individual daemon process (yes, I know
that there are other - perhaps better - ways to achieve this. but this
is what I need).

I'm using the mod_wsgi module, and a python script.
I'm setting up several daemon processes for serving the requests, when
Apache is originally executed from a root-process that has SETUID and
SETGID capabilities, in all its capabilities sets (I set them in the
INHERITABLE set, and verified).
The daemon (non-root) processes run under "daemon" user (uid = 2).

However when I look at /proc/<some httpd pid>/status >I see that the
capabilites are only passed to the initial "httpd" process, and all
the others have them set only in their INHERITABLE set. i.e. initial
process has
   CapInh: 00000000000000c0
   CapPrm: 00000000fffffeff
   CapEff: 00000000fffffeff
while the others have
   CapInh: 00000000000000c0
   CapPrm: 0000000000000000
   CapEff: 0000000000000000

And as expected setfsuid() has no effect.

To rule out mod_wsgi as the source of the problem, I deleted the check
that forbids it from being used with root user, re-installed, and
indeed I can then setfsuid() as I wish.
So it seems to me the problem does not lie there, but somewhere in the
way httpd creates the new processes and the capabilities are passed
on.

Admittedly I'm no kernel expert, and this is my first experience with
the capabilities feature.
So I'd appreciate any help and useful idea to what I do wrong.

Some tecnical details:
httpd 2.2.14
OS - RHEL 5.34 (kernel 2.6.18)
mod_wsgi 3.1
Python 2.5.4

Thank you,
Osi

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