Re: SELinux is preventing gdm-binary (xdm_t) "unlink" to ... and npviewer

[Daniel J Walsh]

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Antonio Olivares wrote:
> --- On Fri, 11/14/08, Daniel J Walsh  wrote:
> > From: Daniel J Walsh 
> > Subject: Re: SELinux is preventing gdm-binary (xdm_t) "unlink" to ... and npviewer
> > To: [e-mail]
> > Cc: [e-mail]
> > Date: Friday, November 14, 2008, 6:08 AM
>
> Antonio Olivares wrote:
> > > > Dear selinux experts,
> > > >
> > > > running fedora 10 preview updated to latest packages
> > > >
> > > > [olivares@riohigh2 ~]$ uname -r
> > > > 2.6.27.5-101.fc10.i686
> > > > [olivares@riohigh2 ~]$ rpm -qa selinux*
> > > > selinux-policy-3.5.13-18.fc10.noarch
> > > > selinux-policy-targeted-3.5.13-18.fc10.noarch
> > > >
> > > > Summary:
> > > >
> > > > SELinux is preventing gdm-binary (xdm_t)
>
> "unlink" to
> > > > ./force-display-on-active-vt (var_spool_t).
> > > >
> > > > Detailed Description:
> > > >
> > > > SELinux is preventing gdm-binary (xdm_t)
>
> "unlink" to
> > > > ./force-display-on-active-vt (var_spool_t). The
>
> SELinux type var_spool_t, is a
> > > > generic type for all files in the directory and very
>
> few processes (SELinux
> > > > Domains) are allowed to write to this SELinux type.
>
> This type of denial usual
> > > > indicates a mislabeled file. By default a file created
>
> in a directory has the
> > > > gets the context of the parent directory, but SELinux
>
> policy has rules about the
> > > > creation of directories, that say if a process running
>
> in one SELinux Domain
> > > > (D1) creates a file in a directory with a particular
>
> SELinux File Context (F1)
> > > > the file gets a different File Context (F2). The
>
> policy usually allows the
> > > > SELinux Domain (D1) the ability to write, unlink, and
>
> append on (F2). But if for
> > > > some reason a file (./force-display-on-active-vt) was
>
> created with the wrong
> > > > context, this domain will be denied. The usual
>
> solution to this problem is to
> > > > reset the file context on the target file, restorecon
>
> -v
> > > > './force-display-on-active-vt'. If the file
>
> context does not change from
> > > > var_spool_t, then this is probably a bug in policy.
>
> Please file a bug report
> > > > (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi)
>
> against the selinux-policy
> > > > package. If it does change, you can try your
>
> application again to see if it
> > > > works. The file context could have been mislabeled by
>
> editing the file or moving
> > > > the file from a different directory, if the file keeps
>
> getting mislabeled, check
> > > > the init scripts to see if they are doing something to
>
> mislabel the file.
> > > > Allowing Access:
> > > >
> > > > You can attempt to fix file context by executing
>
> restorecon -v
> > > > './force-display-on-active-vt'
> > > >
> > > > Fix Command:
> > > >
> > > > restorecon './force-display-on-active-vt'
> > > >
> > > > Additional Information:
> > > >
> > > > Source Context
>
> system_u:system_r:xdm_t:s0-s0:c0.c1023
> > > > Target Context
>
> system_u:object_r:var_spool_t:s0
> > > > Target Objects
>
> ./force-display-on-active-vt [ file ]
> > > > Source                        gdm-binary
> > > > Source Path                   /usr/sbin/gdm-binary
> > > > Port                          <Unknown>
> > > > Host                          riohigh2
> > > > Source RPM Packages           gdm-2.24.0-12.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                   mislabeled_file
> > > > Host Name                     riohigh2
> > > > Platform                      Linux riohigh2
>
> 2.6.27.5-94.fc10.i686 #1 SMP Mon
> > > >                           Nov 10 15:51:55 EST 2008
>
> i686 athlon
> > > > Alert Count                   17
> > > > First Seen                    Mon 03 Nov 2008 07:08:33
>
> AM CST
> > > > Last Seen                     Thu 13 Nov 2008 04:21:21
>
> PM CST
> > > > Local ID
>
> a66adf6c-89d5-4d90-83ca-f34c94bb4d45
> > > > Line Numbers
> > > >
> > > > Raw Audit Messages
> > > >
> > > > node=riohigh2 type=AVC msg=audit(1226614881.881:36):
>
> avc:  denied  { unlink } for  pid=2090
> comm="gdm-binary"
> name="force-display-on-active-vt" dev=sda6
> ino=190494 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023
> tcontext=system_u:object_r:var_spool_t:s0 tclass=file
> > > > node=riohigh2 type=SYSCALL
>
> msg=audit(1226614881.881:36): arch=40000003 syscall=10
> success=no exit=-13 a0=8063b84 a1=0 a2=4f86dc a3=9940400
> items=0 ppid=1 pid=2090 auid=4294967295 uid=0 gid=0 euid=0
> suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none)
> ses=4294967295 comm="gdm-binary"
> exe="/usr/sbin/gdm-binary"
> subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 key=(null)
> > > >
>
> THe question here is which process created this file?
> force-display-on-active-vt
> > > > Summary:
> > > >
> > > > SELinux is preventing the npviewer.bin from using
>
> potentially mislabeled files
> (/home/olivares/.icedteaplugin/icedtea-plugin-to-appletviewer).
> > > > Detailed Description:
> > > >
> > > > SELinux has denied npviewer.bin access to potentially
>
> mislabeled file(s)
> (/home/olivares/.icedteaplugin/icedtea-plugin-to-appletviewer).
> This means that
> > > > SELinux will not allow npviewer.bin to use these
>
> files. It is common for users
> > > > to edit files in their home directory or tmp
>
> directories and then move (mv) them
> > > > to system directories. The problem is that the files
>
> end up with the wrong file
> > > > context which confined applications are not allowed to
>
> access.
> > > > Allowing Access:
> > > >
> > > > If you want npviewer.bin to access this files, you
>
> need to relabel them using
> > > > restorecon -v
>
> '/home/olivares/.icedteaplugin/icedtea-plugin-to-appletviewer'.
> > > > You might want to relabel the entire directory using
>
> restorecon -R -v '<Unknown>'.
> > > > Additional Information:
> > > >
> > > > Source Context
>
> unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c102
> > > >                           3
> > > >
> > > > Target Context
>
> unconfined_u:object_r:user_home_t:s0
> > > > Target Objects
>
> /home/olivares/.icedteaplugin/icedtea-plugin-to-
> > > >                           appletviewer [ fifo_file
>
> ]
> > > > Source                        npviewer.bin
> > > > Source Path
>
> /usr/lib/nspluginwrapper/npviewer.bin
> > > > Port                          <Unknown>
> > > > Host                          riohigh2
> > > > 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                   home_tmp_bad_labels
> > > > Host Name                     riohigh2
> > > > Platform                      Linux riohigh2
>
> 2.6.27.5-101.fc10.i686 #1 SMP Wed
> > > >                           Nov 12 00:50:43 EST 2008
>
> i686 athlon
> > > > Alert Count                   4
> > > > First Seen                    Thu 13 Nov 2008 06:31:50
>
> PM CST
> > > > Last Seen                     Thu 13 Nov 2008 06:31:55
>
> PM CST
> > > > Local ID
>
> 81d406be-b7e4-4bf4-a8c7-f12b7c36ee27
> > > > Line Numbers
> > > >
> > > > Raw Audit Messages
> > > >
> > > > node=riohigh2 type=AVC msg=audit(1226622715.909:38):
>
> avc:  denied  { write } for  pid=4732
> comm="npviewer.bin"
> path="/home/olivares/.icedteaplugin/icedtea-plugin-to-appletviewer"
> dev=sda6 ino=263881
> scontext=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023
> tcontext=unconfined_u:object_r:user_home_t:s0
> tclass=fifo_file
> > > > node=riohigh2 type=AVC msg=audit(1226622715.909:38):
>
> avc:  denied  { read } for  pid=4732
> comm="npviewer.bin"
> path="/home/olivares/.icedteaplugin/icedtea-appletviewer-to-plugin"
> dev=sda6 ino=263847
> scontext=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023
> tcontext=unconfined_u:object_r:user_home_t:s0
> tclass=fifo_file
> > > > node=riohigh2 type=SYSCALL
>
> msg=audit(1226622715.909:38): arch=40000003 syscall=11
> success=yes exit=0 a0=9e70d28 a1=9e71d40 a2=9e72210 a3=0
> items=0 ppid=3572 pid=4732 auid=500 uid=500 gid=500 euid=500
> suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 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)
> > > > Has someone else encountered these before and what
>
> should I do about them?
> > > > Thanks,
> > > >
> > > > Antonio
> > > >
> > > > --
> > > > fedora-selinux-list mailing list
> > > > [e-mail]
>
> https://www.redhat.com/mailman/listinfo/fedora-selinux-list
> If you change the context of this directory to
>
> chcon -R -t nsplugin_home_t ~/.icedteaplugin
>
> You should eliminate this avc.  I will change the layout in
> selinux-policy-3.5.13-21.fc10
> I tried the chcon command and this is what happened
> Nov 14 20:00:05 localhost kernel: type=1400 audit(1226714405.352:155): avc:  denied  { write } for  pid=5155 comm="npviewer.bin" path="/home/olivares/.icedteaplugin/icedtea-plugin-to-appletviewer" dev=dm-0 ino=7734395 scontext=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=fifo_file                                                           
> Nov 14 20:00:05 localhost kernel: type=1400 audit(1226714405.352:156): avc:  denied  { read } for  pid=5155 comm="npviewer.bin" path="/home/olivares/.icedteaplugin/icedtea-appletviewer-to-plugin" dev=dm-0 ino=7734394 scontext=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=fifo_file                                                            
> Nov 14 20:00:05 localhost kernel: type=1400 audit(1226714405.388:157): avc:  denied  { write } for  pid=5159 comm="npviewer.bin" path="/home/olivares/.icedteaplugin/icedtea-plugin-to-appletviewer" dev=dm-0 ino=7734395 scontext=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=fifo_file                                                           
> Nov 14 20:00:05 localhost kernel: type=1400 audit(1226714405.388:158): avc:  denied  { read } for  pid=5159 comm="npviewer.bin" path="/home/olivares/.icedteaplugin/icedtea-appletviewer-to-plugin" dev=dm-0 ino=7734394 scontext=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=fifo_file                                                            
> Nov 14 20:00:15 localhost kernel: type=1400 audit(1226714415.618:159): avc:  denied  { write } for  pid=5166 comm="npviewer.bin" path="/home/olivares/.icedteaplugin/icedtea-plugin-to-appletviewer" dev=dm-0 ino=7734395 scontext=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=fifo_file                                                           
> Nov 14 20:00:15 localhost kernel: type=1400 audit(1226714415.618:160): avc:  denied  { read } for  pid=5166 comm="npviewer.bin" path="/home/olivares/.icedteaplugin/icedtea-appletviewer-to-plugin" dev=dm-0 ino=7734394 scontext=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=fifo_file                                                            
> Nov 14 20:00:15 localhost kernel: type=1400 audit(1226714415.654:161): avc:  denied  { write } for  pid=5169 comm="npviewer.bin" path="/home/olivares/.icedteaplugin/icedtea-plugin-to-appletviewer" dev=dm-0 ino=7734395 scontext=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=fifo_file                                                           
> Nov 14 20:00:15 localhost kernel: type=1400 audit(1226714415.654:162): avc:  denied  { read } for  pid=5169 comm="npviewer.bin" path="/home/olivares/.icedteaplugin/icedtea-appletviewer-to-plugin" dev=dm-0 ino=7734394 scontext=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=fifo_file                                                            
> Nov 14 20:00:22 localhost kernel: type=1400 audit(1226714422.242:163): avc:  denied  { write } for  pid=5176 comm="npviewer.bin" path="/home/olivares/.icedteaplugin/icedtea-plugin-to-appletviewer" dev=dm-0 ino=7734395 scontext=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=fifo_file                                                           
> Nov 14 20:00:22 localhost kernel: type=1400 audit(1226714422.242:164): avc:  denied  { read } for  pid=5176 comm="npviewer.bin" path="/home/olivares/.icedteaplugin/icedtea-appletviewer-to-plugin" dev=dm-0 ino=7734394 scontext=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=fifo_file                                                            
> Nov 14 20:00:22 localhost kernel: type=1400 audit(1226714422.279:165): avc:  denied  { write } for  pid=5179 comm="npviewer.bin" path="/home/olivares/.icedteaplugin/icedtea-plugin-to-appletviewer" dev=dm-0 ino=7734395 scontext=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=fifo_file                                                           
> Nov 14 20:00:22 localhost kernel: type=1400 audit(1226714422.279:166): avc:  denied  { read } for  pid=5179 comm="npviewer.bin" path="/home/olivares/.icedteaplugin/icedtea-appletviewer-to-plugin" dev=dm-0 ino=7734394 scontext=unconfined_u:unconfined_r:nsplugin_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=fifo_file                                                            
> ^C                                                                              
> [root@localhost ~]# chcon -R -t nsplugin_home_t ~/.icedteaplugin                
> chcon: cannot access `/root/.icedteaplugin': No such file or directory
> Thanks,
> Antonio

You need to do it on your homedir.

chcon -R -t nsplugin_home_t /home/olivares/.icedteaplugin
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