Selinux, cups, hplip

Richard Shaw hobbes1069 at gmail.com
Wed Jun 24 00:09:39 UTC 2009


On Mon, Jun 22, 2009 at 3:48 PM, Daniel J Walsh <dwalsh at redhat.com> wrote:

> On 06/20/2009 01:50 PM, Steven Stern wrote:
>
>> On 06/20/2009 06:12 AM, Daniel J Walsh wrote:
>>
>>> On 06/19/2009 07:10 PM, Steven Stern wrote:
>>>
>>>> After installing hplip-gui, I got selinux errors when checking on the
>>>> printer status.
>>>>
>>>> audit2allow generated the following policy
>>>>
>>>> module cups20090619 1.0;
>>>>
>>>> require {
>>>> type hwdata_t;
>>>> type xdm_t;
>>>> class dir search;
>>>> class file { read getattr open };
>>>> }
>>>>
>>>> #============= xdm_t ==============
>>>> allow xdm_t hwdata_t:dir search;
>>>> allow xdm_t hwdata_t:file { read getattr open };
>>>>
>>>>
>>>>  xdm is checking the printer status? This allow rule indicates the X
>>> Login program is checking the printer status. Could you attach the AVC's
>>> you used to generate this policy.
>>>
>>>
>> And here's another one related to hplip
>>
>> type=AVC msg=audit(1245520061.974:38037): avc: denied { read } for
>> pid=25561 comm="python" name="mls" dev=selinuxfs ino=12
>> scontext=system_u:system_r:hplip_t:s0
>> tcontext=system_u:object_r:security_t:s0 tclass=file
>>
>> type=AVC msg=audit(1245520061.974:38037): avc: denied { read open } for
>> pid=25561 comm="python" name="mls" dev=selinuxfs ino=12
>> scontext=system_u:system_r:hplip_t:s0
>> tcontext=system_u:object_r:security_t:s0 tclass=file
>>
>>
>>
>>  Could you report this as a bug to cups. Cups has some MLS aware ness in
> it and maybe it is reading this file directly rather then through
> libselinux.  CC me on the bug report dwalsh at redhat.com
>
>
Just a "me too" here. I've got two separate issues, one has to do with this
thread. Just after installing F11 everything seemed fine. I poked the
necessary holes in my firewall and shared my printer queues and my wife
could print from her F10 laptop. Now it seems just about every job gets
"stuck" and I see the AVC denials about python. Here's the details for mine
(just in case anything is different:

---
Summary:

SELinux is preventing python (hplip_t) "read" security_t.

Detailed Description:

[SELinux is in permissive mode, the operation would have been denied but was
permitted due to permissive mode.]

SELinux denied access requested by python. It is not expected that this
access
is required by python and this access may signal an intrusion attempt. It is
also possible that the specific version or configuration of the application
is
causing it to require additional access.

Allowing Access:

You can generate a local policy module to allow this access - see FAQ
(http://fedora.redhat.com/docs/selinux-faq-fc5/#id2961385) Or you can
disable
SELinux protection altogether. Disabling SELinux protection is not
recommended.
Please file a bug report (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi)
against this package.

Additional Information:

Source Context                system_u:system_r:hplip_t:s0
Target Context                system_u:object_r:security_t:s0
Target Objects                mls [ file ]
Source                        python
Source Path                   /usr/bin/python
Port                          <Unknown>
Host                          hobbes.localdomain
Source RPM Packages           python-2.6-9.fc11
Target RPM Packages
Policy RPM                    selinux-policy-3.6.12-50.fc11
Selinux Enabled               True
Policy Type                   targeted
MLS Enabled                   True
Enforcing Mode                Permissive
Plugin Name                   catchall
Host Name                     hobbes.localdomain
Platform                      Linux hobbes.localdomain
2.6.29.4-167.fc11.x86_64
                              #1 SMP Wed May 27 17:27:08 EDT 2009 x86_64
x86_64
Alert Count                   16
First Seen                    Sun 21 Jun 2009 02:29:26 PM CDT
Last Seen                     Tue 23 Jun 2009 06:58:21 PM CDT
Local ID                      0a0b19ce-a912-4305-9e4a-1e1369ea4f3f
Line Numbers

Raw Audit Messages

node=hobbes.localdomain type=AVC msg=audit(1245801501.788:374): avc:
denied  { read } for  pid=11771 comm="python" name="mls" dev=selinuxfs
ino=12 scontext=system_u:system_r:hplip_t:s0
tcontext=system_u:object_r:security_t:s0 tclass=file

node=hobbes.localdomain type=AVC msg=audit(1245801501.788:374): avc:
denied  { open } for  pid=11771 comm="python" name="mls" dev=selinuxfs
ino=12 scontext=system_u:system_r:hplip_t:s0
tcontext=system_u:object_r:security_t:s0 tclass=file

node=hobbes.localdomain type=SYSCALL msg=audit(1245801501.788:374):
arch=c000003e syscall=2 success=yes exit=6 a0=7fffb58ba060 a1=0
a2=7fffb58ba06c a3=fffffff8 items=0 ppid=11764 pid=11771 auid=4294967295
uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none)
ses=4294967295 comm="python" exe="/usr/bin/python"
subj=system_u:system_r:hplip_t:s0 key=(null)
---

Thanks,
Richard
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