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Bug 974932 - selinux denies rsyslog to drop priviliges
Summary: selinux denies rsyslog to drop priviliges
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: selinux-policy
Version: 6.4
Hardware: All
OS: Linux
unspecified
medium
Target Milestone: rc
: ---
Assignee: Miroslav Grepl
QA Contact: Michal Trunecka
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2013-06-17 07:39 UTC by Jens Kuehnel
Modified: 2014-09-30 23:35 UTC (History)
4 users (show)

Fixed In Version: selinux-policy-3.7.19-208.el6
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-11-21 10:31:12 UTC
Target Upstream Version:
Embargoed:


Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2013:1598 0 normal SHIPPED_LIVE selinux-policy bug fix and enhancement update 2013-11-20 21:39:24 UTC

Description Jens Kuehnel 2013-06-17 07:39:12 UTC
Description of problem:
rsyslog can drop privileges with option $PrivDropToUser and $PrivDropToGroup, but SElinux does not allow setuid/setgid.

Version-Release number of selected component (if applicable):
selinux-policy-3.7.19-195.el6_4.10.noarch

How reproducible:
100%


Steps to Reproduce:
1. Create user rsyslog with: useradd -r rsyslog 
2. Remove line "$ModLoad imklog" to rsyslog.conf
3. Add line "$PrivDropToUser rsyslog" to rsyslog.conf
3. Fix permission in /var/log/ to allow writes
4. restart

Actual results:
could not set requested userid: Operation not permitted

Expected results:
no output, and eUID 


Additional info:
I created the following te to fix this:
module rsyslog-drop-priv 1.0;

require {
        type syslogd_t;
        class capability setuid;
        class capability setgid;
}

#============= syslogd_t ==============
allow syslogd_t self:capability setuid;
allow syslogd_t self:capability setgid;

Comment 2 Daniel Walsh 2013-06-18 15:49:29 UTC
02dd9555a1e7c22c1ce8276ca7e82dabc0a11223 fixes this in git.

Comment 3 Miroslav Grepl 2013-07-17 12:24:17 UTC
Back ported.

Comment 6 errata-xmlrpc 2013-11-21 10:31:12 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2013-1598.html


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