Bug 620815

Description of problem:
SELinux is alerting like mentioned below. Restoring the context just works for a while, the problem show up again (seemingly after printing or some status change in the printer or CUPS, i.e. replacing toner which was low, restarting CUPS, ...)


Version-Release number of selected component (if applicable):
cups-1.4.4-7.fc14.x86_64
selinux-policy-targeted-3.8.8-8.fc14.noarch

How reproducible:
Happens at random, but quite often (two or three times yesterday afternoon, again today)

Steps to Reproduce:
1.
2.
3.
  
Actual results:
(Machine name replaced with XXX to protect the guilty)

Summary: 

SELinux is preventing /usr/lib/cups/backend/socket "read" access to
/etc/cups/ppd/dcsc.ppd.

Detailed Description:

SELinux denied access requested by socket. /etc/cups/ppd/dcsc.ppd may be a
mislabeled. /etc/cups/ppd/dcsc.ppd default SELinux type is cupsd_rw_etc_t, but
its current type is tmp_t. Changing this file back to the default type, may fix
your problem.

File contexts can be assigned to a file in the following ways.

  * Files created in a directory receive the file context of the parent
    directory by default.
  * The SELinux policy might override the default label inherited from the
    parent directory by specifying a process running in context A which creates
    a file in a directory labeled B will instead create the file with label C.
    An example of this would be the dhcp client running with the dhclient_t type
    and creating a file in the directory /etc. This file would normally receive
    the etc_t type due to parental inheritance but instead the file is labeled
    with the net_conf_t type because the SELinux policy specifies this.
  * Users can change the file context on a file using tools such as chcon, or
    restorecon.

This file could have been mislabeled either by user error, or if an normally
confined application was run under the wrong domain.

However, this might also indicate a bug in SELinux because the file should not
have been labeled with this type.

If you believe this is a bug, please file a bug report against this package.

Allowing Access:

You can restore the default system context to this file by executing the
restorecon command. restorecon '/etc/cups/ppd/dcsc.ppd', if this file is a
directory, you can recursively restore using restorecon -R
'/etc/cups/ppd/dcsc.ppd'.

Fix Command:

/sbin/restorecon '/etc/cups/ppd/dcsc.ppd'

Additional Information:

Source Context                unconfined_u:system_r:cupsd_t:s0-s0:c0.c1023
Target Context                system_u:object_r:tmp_t:s0
Target Objects                /etc/cups/ppd/dcsc.ppd [ file ]
Source                        pdftops
Source Path                   /usr/lib/cups/filter/pdftops
Port                          <Unknown>
Host                          XXX
Source RPM Packages           cups-1.4.4-7.fc14
Target RPM Packages           
Policy RPM                    selinux-policy-3.8.8-8.fc14
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Plugin Name                   restorecon
Host Name                     XXX
Platform                      Linux XXX
                              2.6.35-0.57.rc6.git5.fc15.x86_64 #1 SMP Fri Jul 30
                              17:16:30 UTC 2010 x86_64 x86_64
Alert Count                   20
First Seen                    Mon 02 Aug 2010 03:34:54 PM CLT
Last Seen                     Mon 02 Aug 2010 05:08:37 PM CLT
Local ID                      3ff8f68b-e581-4f5e-92b6-9775779a585e
Line Numbers                  

Raw Audit Messages            

node=XXX type=AVC msg=audit(1280783317.119:527): avc:  denied  { read } for  pid=21078 comm="socket" name="dcsc.ppd" dev=dm-0 ino=1294512 scontext=unconfined_u:system_r:cupsd_t:s0-s0:c0.c1023 tcontext=system_u:object_r:tmp_t:s0 tclass=file

node=XXX type=SYSCALL msg=audit(1280783317.119:527): arch=c000003e syscall=2 success=no exit=-13 a0=7fffd2f89ee6 a1=0 a2=0 a3=7fffd2f7cbd0 items=0 ppid=16637 pid=21078 auid=500 uid=0 gid=7 euid=0 suid=0 fsuid=0 egid=7 sgid=7 fsgid=7 tty=(none) ses=2 comm="socket" exe="/usr/lib/cups/backend/socket" subj=unconfined_u:system_r:cupsd_t:s0-s0:c0.c1023 key=(null)


Expected results:
No SELinux alerts...

Additional info: