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Re: SELinux alert when running yum update



Colin Paul Adams wrote:
After upgrading my system from F9 to F10 I ran a yum update.

The following occurred:

Summary:

SELinux is preventing npviewer.bin (nsplugin_t) "search" to ./.fontconfig
(unlabeled_t).

Detailed Description:

SELinux denied access requested by npviewer.bin. It is not expected that this
access is required by npviewer.bin 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:

Sometimes labeling problems can cause SELinux denials. You could try to restore
the default system file context for ./.fontconfig,

restorecon -v './.fontconfig'

If this does not work, there is currently no automatic way to allow this access.
Instead, 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                unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c102
                              3
Target Context                system_u:object_r:unlabeled_t:s0
Target Objects                ./.fontconfig [ dir ]
Source                        npviewer.bin
Source Path                   /usr/lib/nspluginwrapper/npviewer.bin
Port                          <Unknown>
Host                          susannah.colina.demon.co.uk
Source RPM Packages           nspluginwrapper-1.1.2-4.fc10
Target RPM Packages Policy RPM selinux-policy-3.5.13-18.fc10
Selinux Enabled               True
Policy Type                   targeted
MLS Enabled                   True
Enforcing Mode                Enforcing
Plugin Name                   catchall_file
Host Name                     susannah.colina.demon.co.uk
Platform                      Linux susannah.colina.demon.co.uk
                              2.6.27.5-117.fc10.x86_64 #1 SMP Tue Nov 18
                              11:58:53 EST 2008 x86_64 x86_64
Alert Count                   37
First Seen                    Sat 29 Nov 2008 15:33:18 GMT
Last Seen                     Sat 29 Nov 2008 15:33:28 GMT
Local ID                      925c2472-2846-47c2-96f9-bccaadb1aaef
Line Numbers Raw Audit Messages
node=susannah.colina.demon.co.uk type=AVC msg=audit(1227972808.92:117): avc:  denied  { search } for  pid=3733 comm="npviewer.bin" name=".fontconfig" dev=dm-1 ino=19301092 scontext=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023 tcontext=system_u:object_r:unlabeled_t:s0 tclass=dir

node=susannah.colina.demon.co.uk type=SYSCALL msg=audit(1227972808.92:117): arch=40000003 syscall=5 per=8 success=no exit=-13 a0=87d4d48 a1=0 a2=a5517200 a3=ffffffff items=0 ppid=3588 pid=3733 auid=501 uid=501 gid=501 euid=501 suid=501 fsuid=501 egid=501 sgid=501 fsgid=501 tty=(none) ses=1 comm="npviewer.bin" exe="/usr/lib/nspluginwrapper/npviewer.bin" subj=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023 key=(null)

And if I try to raise tyhe bug I get:

ERROR
The requested URL could not be retrieved


You can do a couple of things. First, it's probably not a bad idea to run these commands as root:

restorecon -vR /home
restorecon -vR /usr

Then try again by opening your browser and going to a page that caused errors before. If it still doesn't work you can use audit2allow to create a policy. I set up all my policies in a directory called /root/selinux. So as root, do this:

mkdir selinux
cd selinux
setenforce 0
# open your web browser and go to a page with the plugin
grep npviewer.bin /var/log/audit/audit.log | audit2allow -a -M npviewer
# review npviewer.te so make sure it looks right.
semodule -i npviewer.pp
setenforce 1
# open your browser to see if the plugin works now

Hope this helps!
--
Thomas


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