Re: SELinux Coloring book?

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Daniel J Walsh wrote:

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> 
> On 11/14/2013 09:24 AM, Timothy Murphy wrote:
>> Miroslav Grepl wrote:
>> 
>>>> New article on opensource.com describing SELinux enforcement in simple
>>>> terms. Check it out.
>>>> 
>>>> http://opensource.com/business/13/11/selinux-policy-guide
>> 
>>> I believe it is a great introduction to SELinux.
>> 
>> I liked this.
>> 
>> I also liked the video <http://www.youtube.com/watch?v=MxjenQ31b70> with
>> accompanying slides at
>> 
<http://people.redhat.com/tcameron/summit2010/selinux/SELinuxMereMortals.pdf>.
>>
>>  I thought I'd try to move from SELinux permissive mode following the
>> advice in this video and slides.
>> 
>> The main problem I met was following sealert advice of the form
>> ----------------------------- If you want to allow perl to have search
>> access on the tim directory Then you need to change the label on
>> /home/tim Do # semanage fcontext -a -t FILE_TYPE '/home/tim' where
>> FILE_TYPE is one of the following: etc_t, proc_t, sysfs_t,
...
>> devpts_t, var_t, user_home_dir_t, cluster_conf_t, var_t, var_t.
>> -----------------------------
>> 
> 
> Yes those ones are tough, basically the system is trying to expand the
> list of
> file types that the application is allowed to write.  In this case it
> expanded a little too large.
> 
> What was the AVC that caused this?

I gave the command
  [root@grover tim]# sealert -a /var/log/audit/audit.log
which was mentioned in the video I cited,
and the above was one of many suggestions that were made.

The response started with 11 AVC's,
which all concerned the same file,
this being a sample:

**** Invalid AVC allowed in current policy ***

type=AVC msg=audit(1330438567.88:108452): avc:  denied  { getattr } for  
pid=2567 comm="config" path="/etc/dovecot/dovecot.conf" dev=sdb10 
ino=3392618 scontext=unconfined_u:system_r:dovecot_t:s0 
tcontext=system_u:object_r:usr_t:s0 tclass=file

found 11 alerts in /var/log/audit/audit.log

Then there was a much longer portion going over different files,
giving terse advice of what to do in many cases,
but also vague advice of the kind above in other cases.

-- 
Timothy Murphy  
e-mail: gayleard /at/ eircom.net
School of Mathematics, Trinity College, Dublin 2, Ireland


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