Tutorial on setting up SELinux / X Server

[Richard Chapman]

Eamon Walsh wrote:
> On 12/03/2009 08:59 PM, Richard Chapman wrote:
>   
>> I have a Cetos 5.4 system ruining x - and I also have some boot time x 
>> related denials. I therefore tried the below setsebool but got the 
>> following errors:
>>
>> setsebool -P xserver_object_manager on
>>
>> ibsemanage.dbase_llist_set: record not found in the database
>> libsemanage.dbase_llist_set: could not set record value
>> Could not change boolean xserver_object_manager
>> Could not change policy booleans
>>
>>
>> Is this because Centos is different - or is there a typo in the above 
>> command?
>>
>> Richard.
>>
>>   
>>     
>
>
> I don't think that RHEL 5.4 has this boolean.  Look in /selinux/booleans
> and see if there is a file called xserver_object_manager.
>
> However, if you are getting boot-time X denials then it's probably not
> anything to do with the X object manager.  That sounds like a kernel
> policy problem.  What are the denials?
>
>
>   
Hi Eamon

You are right - that there is no such file in /selinux/booleans on my 
rhel 5.4 system.

I have been getting these for ages - and have discussed with Daniel - 
but not found the problem:
Here is the first - and the others are similar. I have tried the 
suggested re-labelling, and moved /tmp to a tmpfs volume - but still the 
errors persist:

Summary
SELinux is preventing the setxkbmap from using potentially mislabeled 
files (./.X11-unix).
Detailed Description
[SELinux is in permissive mode, the operation would have been denied but 
was permitted due to permissive mode.]

SELinux has denied setxkbmap access to potentially mislabeled file(s) 
(./.X11-unix). This means that SELinux will not allow setxkbmap to use 
these files. It is common for users to edit files in their home 
directory or tmp directories and then move (mv) them to system 
directories. The problem is that the files end up with the wrong file 
context which confined applications are not allowed to access.

Allowing Access
If you want setxkbmap to access this files, you need to relabel them 
using restorecon -v './.X11-unix'. You might want to relabel the entire 
directory using restorecon -R -v './.X11-unix'.
Additional Information

Source Context:   	system_u:system_r:rhgb_t
Target Context:   	system_u:object_r:initrc_tmp_t
Target Objects:   	./.X11-unix [ dir ]
Source:   	setxkbmap
Source Path:   	/usr/bin/setxkbmap
Port:   	<Unknown>
Host:   	C5.aardvark.com.au
Source RPM Packages:   	xorg-x11-xkb-utils-1.0.2-2.1
Target RPM Packages:   	
Policy RPM:   	selinux-policy-2.4.6-225.el5
Selinux Enabled:   	True
Policy Type:   	targeted
MLS Enabled:   	True
Enforcing Mode:   	Permissive
Plugin Name:   	home_tmp_bad_labels
Host Name:   	C5.aardvark.com.au
Platform:   	Linux C5.aardvark.com.au 2.6.18-164.el5 #1 SMP Thu Sep 3 
03:28:30 EDT 2009 x86_64 x86_64
Alert Count:   	43
First Seen:   	Sun Jan 11 17:55:13 2009
Last Seen:   	Tue Sep 29 12:03:49 2009
Local ID:   	0950df01-cfad-420a-9e84-4996a8d31942
Line Numbers:   	

Raw Audit Messages :

host=C5.aardvark.com.au type=AVC msg=audit(1254197029.941:12): avc: 
denied { search } for pid=4172 comm="setxkbmap" name=".X11-unix" 
dev=tmpfs ino=13452 scontext=system_u:system_r:rhgb_t:s0 
tcontext=system_u:object_r:initrc_tmp_t:s0 tclass=dir
host=C5.aardvark.com.au type=AVC msg=audit(1254197029.941:12): avc: 
denied { search } for pid=4172 comm="setxkbmap" name=".X11-unix" 
dev=tmpfs ino=13452 scontext=system_u:system_r:rhgb_t:s0 
tcontext=system_u:object_r:initrc_tmp_t:s0 tclass=dir
host=C5.aardvark.com.au type=SYSCALL msg=audit(1254197029.941:12): 
arch=c000003e syscall=42 success=no exit=-2 a0=3 a1=7fffd604c2a0 a2=13 
a3=3be2b51a30 items=0 ppid=4171 pid=4172 auid=4294967295 uid=0 gid=0 
euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 
comm="setxkbmap" exe="/usr/bin/setxkbmap" 
subj=system_u:system_r:rhgb_t:s0 key=(null)
host=C5.aardvark.com.au type=SYSCALL msg=audit(1254197029.941:12): 
arch=c000003e syscall=42 success=no exit=-2 a0=3 a1=7fffd604c2a0 a2=13 
a3=3be2b51a30 items=0 ppid=4171 pid=4172 auid=4294967295 uid=0 gid=0 
euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 
comm="setxkbmap" exe="/usr/bin/setxkbmap" 
subj=system_u:system_r:rhgb_t:s0 key=(null)


Richard