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Re: help adding a type attribute to a domain



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On 03/11/2011 05:42 PM, Daniel J Walsh wrote:
> On 03/11/2011 10:57 AM, Maria Iano wrote:
>> I'm getting a denial that audit2why says is due to constraints.  
>> Sesearch does show that the action has an allow rule.
> 
>> Here are the audit messages:
> 
>> host=eng-vocngcn03.eng.gci type=AVC msg=audit(1299844473.770:740848):  
>> avc:  denied  { sigkill } for  pid=22927 comm="kill"  
>> scontext=system_u:system_r:rgmanager_t:s0  
>> tcontext=system_u:system_r:unconfined_t:s0-s0:c0.c1023 tclass=process
> 
>> host=eng-vocngcn03.eng.gci type=SYSCALL  
>> msg=audit(1299844473.770:740848): arch=c000003e syscall=62 success=yes  
>> exit=0 a0=19ba a1=9 a2=9 a3=0 items=0 ppid=20173 pid=22927  
>> auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0  
>> fsgid=0 tty=(none) ses=4294967295 comm="kill" exe="/bin/kill"  
>> subj=system_u:system_r:rgmanager_t:s0 key=(null)
> 
> You have rgmanager sending a kill signal to a process running as
> unconfined_t

There is no proof that its rgmanager doing that imho. Since rgmanager_t
is an unconfined_domain it could be any generic application started by a
process running in the rgmanager_t domain (eventually started by rgmanager)

> I would bet this process is running with the wrong domain.  I don't
> think you want rgmanager_t sending kill signals to user processes.
> 
> What process was it trying to kill?
>> Here is the result of running sesearch on that same server:
> 
>> [root@eng-vocngcn03]# sesearch --allow -s rgmanager_t -t unconfined_t - 
>> c process -p sigkill
>> Found 1 av rules:
>>     allow rgmanager_t unconfined_t : process { sigchld sigkill };
> 
>> Here is what audit2why says:
> 
>> [root@eng-vocngcn03]# echo 'host=eng-vocngcn03.eng.gci type=AVC  
>> msg=audit(1299844473.770:740848): avc:  denied  { sigkill } for   
>> pid=22927 comm="kill" scontext=system_u:system_r:rgmanager_t:s0  
>> tcontext=system_u:system_r:unconfined_t:s0-s0:c0.c1023 tclass=process'  
>> | audit2why
>> host=eng-vocngcn03.eng.gci type=AVC msg=audit(1299844473.770:740848):  
>> avc:  denied  { sigkill } for  pid=22927 comm="kill"  
>> scontext=system_u:system_r:rgmanager_t:s0  
>> tcontext=system_u:system_r:unconfined_t:s0-s0:c0.c1023 tclass=process
>>          Was caused by:
>>                  Constraint violation.
>>                  Check policy/constraints.
>>                  Typically, you just need to add a type attribute to  
>> the domain to satisfy the constraint.
> 
>> This is a RHEL 5.5 server and it doesn't have the policy source and I  
>> don't see an rpm available with that. I can't find a constraints file,  
>> and I assume that's because it doesn't have the source. I'm trying to  
>> work out how to add the necessary type attribute to the domain. I do  
>> have a custom policy on the system. It's very long so I'll include the  
>> relevant pieces:
> 
>> require {
>>          type rgmanager_t;
>>          type unconfined_t;
>>          class process { sigkill signal };
>> ..<snip>...
>> }
> 
>> allow rgmanager_t unconfined_t:process sigkill;
>> ..<snip>...
> 
>> Is there something I can add to my policy to resolve the constraints  
>> issue?
> 
>> Thanks,
>> Maria
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>> selinux mailing list
>> selinux@xxxxxxxxxxxxxxxxxxxxxxx
>> https://admin.fedoraproject.org/mailman/listinfo/selinux
> 
> 
> 
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