Re: Troubleshootng the Selunix troubleshooter

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Hi again Daniel
Here is some more info on this problem - which may be significant... After checking the link from my last email again I tried: 
[root@C5 ~]# fixfiles relabel

   Files in the /tmp directory may be labeled incorrectly, this command
   can remove all files in /tmp.  If you choose to remove files from /tmp,
   a reboot will be required after completion.
Do you wish to clean out the /tmp directory [N]? y 
Cleaning out /tmp
/etc/selinux/targeted/contexts/files/file_contexts.homedirs: line 18 has invalid context user_u:object_r:user_mozilla_home_t:s0 /etc/selinux/targeted/contexts/files/file_contexts.homedirs: line 19 has invalid context user_u:object_r:user_mozilla_home_t:s0 /etc/selinux/targeted/contexts/files/file_contexts.homedirs: line 20 has invalid context user_u:object_r:user_mozilla_home_t:s0 /etc/selinux/targeted/contexts/files/file_contexts.homedirs: line 21 has invalid context user_u:object_r:user_mozilla_home_t:s0 /etc/selinux/targeted/contexts/files/file_contexts.homedirs: line 23 has invalid context user_u:object_r:user_mozilla_home_t:s0 /etc/selinux/targeted/contexts/files/file_contexts.homedirs: line 40 has invalid context root:object_r:user_mozilla_home_t:s0 /etc/selinux/targeted/contexts/files/file_contexts.homedirs: line 41 has invalid context root:object_r:user_mozilla_home_t:s0 /etc/selinux/targeted/contexts/files/file_contexts.homedirs: line 42 has invalid context root:object_r:user_mozilla_home_t:s0 /etc/selinux/targeted/contexts/files/file_contexts.homedirs: line 43 has invalid context root:object_r:user_mozilla_home_t:s0 
Exiting after 10 errors.
[root@C5 ~]#
Looks like there is a problem with the policy? Any suggestions how to resolve this? 


Richard.


Richard Chapman wrote:

Thanks Daniel
I'm pretty sure you are right - that there is something wrong with the labelling - but 

touch /.autorelabel; reboot

Doesn't seem to cause the relabelling.
I was a bit suspicious that the relabelling didn't work the first time - because I also did a touch /forcefsck at the boot when I was expecting relabelling - and it seemed to do 3 fscks - but no obvious relabelling. I assumed one of the fscks must have really been a relabel - but maybe not.... Now wehn I do the touch and reboot - there is no delay in the reboot messages on the system console.
I have found this thread - which seem to describe a similar lack of relabelling - but doesn't offer a solution: http://www.centos.org/modules/newbb/viewtopic.php?topic_id=17009&forum=37&post_id=60859 <http://www.centos.org/modules/newbb/viewtopic.php?topic_id=17009&forum=37&post_id=60859>
I haven't tried the 5.3 policy preview yet. Might that help me with the relabelling? 

Thanks again

Richard.




Daniel J Walsh wrote:

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Hash: SHA1

Richard Chapman wrote:
Hi.. When I first installed Centos 5.0 - I disabled SELinux at the first 
sign of trouble. I have now seen the light - and have enabled SELinux
on  the system which is now updated to Centos 5.2 with Kernel Linux
2.6.18-92.1.22.el5 on x86_64. I initially enabled Selinux in permissive
mode - and tried looking at the GUI SELinux Troubleshooter - but it
shows no problems. This may be OK - because there are no "type=avc"
messages in the audit.log file. However there are thousands of "type=
user_avc". Here are the last 20 while in permissive mode:

type=USER_AVC msg=audit(1231052785.984:833): user pid=2489 uid=81
auid=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  {
send_msg } for msgtype=method_call interface=org.freedesktop.DBus
member=AddMatch dest=org.freedesktop.DBus spid=7820
scontext=user_u:system_r:initrc_t:s0
tcontext=system_u:system_r:init_t:s0 tclass=dbus :
exe="/bin/dbus-daemon" (sauid=81, hostname=?, addr=?, terminal=?)'
type=USER_AVC msg=audit(1231052785.984:834): user pid=2489 uid=81
auid=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  {
send_msg } for msgtype=method_call interface=org.freedesktop.DBus
member=GetNameOwner dest=org.freedesktop.DBus spid=7820
scontext=user_u:system_r:initrc_t:s0
tcontext=system_u:system_r:init_t:s0 tclass=dbus :
exe="/bin/dbus-daemon" (sauid=81, hostname=?, addr=?, terminal=?)'
type=USER_AVC msg=audit(1231052785.985:835): user pid=2489 uid=81
auid=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  {
send_msg } for msgtype=method_call interface=org.freedesktop.Hal.Device
member=Rescan dest=org.freedesktop.Hal spid=7820 tpid=3667
scontext=user_u:system_r:initrc_t:s0
tcontext=system_u:system_r:init_t:s0 tclass=dbus :
exe="/bin/dbus-daemon" (sauid=81, hostname=?, addr=?, terminal=?)'
type=USER_AVC msg=audit(1231052785.986:836): user pid=2489 uid=81
auid=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  {
send_msg } for msgtype=method_return dest=:1.14 spid=3667 tpid=7820
scontext=system_u:system_r:init_t:s0
tcontext=user_u:system_r:initrc_t:s0 tclass=dbus :
exe="/bin/dbus-daemon" (sauid=81, hostname=?, addr=?, terminal=?)'
type=USER_AVC msg=audit(1231052785.987:837): user pid=2489 uid=81
auid=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  {
send_msg } for msgtype=method_call interface=org.freedesktop.DBus
member=RemoveMatch dest=org.freedesktop.DBus spid=7820
scontext=user_u:system_r:initrc_t:s0
tcontext=system_u:system_r:init_t:s0 tclass=dbus :
exe="/bin/dbus-daemon" (sauid=81, hostname=?, addr=?, terminal=?)'
type=USER_AVC msg=audit(1231052785.987:838): user pid=2489 uid=81
auid=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  {
send_msg } for msgtype=method_call interface=org.freedesktop.DBus
member=AddMatch dest=org.freedesktop.DBus spid=7820
scontext=user_u:system_r:initrc_t:s0
tcontext=system_u:system_r:init_t:s0 tclass=dbus :
exe="/bin/dbus-daemon" (sauid=81, hostname=?, addr=?, terminal=?)'
type=USER_AVC msg=audit(1231052785.987:839): user pid=2489 uid=81
auid=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  {
send_msg } for msgtype=method_call interface=org.freedesktop.DBus
member=GetNameOwner dest=org.freedesktop.DBus spid=7820
scontext=user_u:system_r:initrc_t:s0
tcontext=system_u:system_r:init_t:s0 tclass=dbus :
exe="/bin/dbus-daemon" (sauid=81, hostname=?, addr=?, terminal=?)'
type=USER_AVC msg=audit(1231052785.988:840): user pid=2489 uid=81
auid=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  {
send_msg } for msgtype=method_call interface=org.freedesktop.Hal.Device
member=Rescan dest=org.freedesktop.Hal spid=7820 tpid=3667
scontext=user_u:system_r:initrc_t:s0
tcontext=system_u:system_r:init_t:s0 tclass=dbus :
exe="/bin/dbus-daemon" (sauid=81, hostname=?, addr=?, terminal=?)'
type=USER_AVC msg=audit(1231052785.989:841): user pid=2489 uid=81
auid=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  {
send_msg } for msgtype=method_return dest=:1.14 spid=3667 tpid=7820
scontext=system_u:system_r:init_t:s0
tcontext=user_u:system_r:initrc_t:s0 tclass=dbus :
exe="/bin/dbus-daemon" (sauid=81, hostname=?, addr=?, terminal=?)'
type=USER_AVC msg=audit(1231052785.990:842): user pid=2489 uid=81
auid=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  {
send_msg } for msgtype=method_call interface=org.freedesktop.DBus
member=RemoveMatch dest=org.freedesktop.DBus spid=7820
scontext=user_u:system_r:initrc_t:s0
tcontext=system_u:system_r:init_t:s0 tclass=dbus :
exe="/bin/dbus-daemon" (sauid=81, hostname=?, addr=?, terminal=?)'
type=USER_AVC msg=audit(1231052785.990:843): user pid=2489 uid=81
auid=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  {
send_msg } for msgtype=method_call interface=org.freedesktop.DBus
member=AddMatch dest=org.freedesktop.DBus spid=7820
scontext=user_u:system_r:initrc_t:s0
tcontext=system_u:system_r:init_t:s0 tclass=dbus :
exe="/bin/dbus-daemon" (sauid=81, hostname=?, addr=?, terminal=?)'
type=USER_AVC msg=audit(1231052785.990:844): user pid=2489 uid=81
auid=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  {
send_msg } for msgtype=method_call interface=org.freedesktop.DBus
member=GetNameOwner dest=org.freedesktop.DBus spid=7820
scontext=user_u:system_r:initrc_t:s0
tcontext=system_u:system_r:init_t:s0 tclass=dbus :
exe="/bin/dbus-daemon" (sauid=81, hostname=?, addr=?, terminal=?)'
type=USER_AVC msg=audit(1231052785.991:845): user pid=2489 uid=81
auid=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  {
send_msg } for msgtype=method_call interface=org.freedesktop.Hal.Device
member=Rescan dest=org.freedesktop.Hal spid=7820 tpid=3667
scontext=user_u:system_r:initrc_t:s0
tcontext=system_u:system_r:init_t:s0 tclass=dbus :
exe="/bin/dbus-daemon" (sauid=81, hostname=?, addr=?, terminal=?)'
type=USER_AVC msg=audit(1231052785.991:846): user pid=2489 uid=81
auid=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  {
send_msg } for msgtype=method_return dest=:1.14 spid=3667 tpid=7820
scontext=system_u:system_r:init_t:s0
tcontext=user_u:system_r:initrc_t:s0 tclass=dbus :
exe="/bin/dbus-daemon" (sauid=81, hostname=?, addr=?, terminal=?)'
type=USER_AVC msg=audit(1231052785.992:847): user pid=2489 uid=81
auid=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  {
send_msg } for msgtype=method_call interface=org.freedesktop.DBus
member=RemoveMatch dest=org.freedesktop.DBus spid=7820
scontext=user_u:system_r:initrc_t:s0
tcontext=system_u:system_r:init_t:s0 tclass=dbus :
exe="/bin/dbus-daemon" (sauid=81, hostname=?, addr=?, terminal=?)'
type=USER_AVC msg=audit(1231052785.992:848): user pid=2489 uid=81
auid=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  {
send_msg } for msgtype=method_call interface=org.freedesktop.DBus
member=AddMatch dest=org.freedesktop.DBus spid=7820
scontext=user_u:system_r:initrc_t:s0
tcontext=system_u:system_r:init_t:s0 tclass=dbus :
exe="/bin/dbus-daemon" (sauid=81, hostname=?, addr=?, terminal=?)'
type=USER_AVC msg=audit(1231052785.992:849): user pid=2489 uid=81
auid=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  {
send_msg } for msgtype=method_call interface=org.freedesktop.DBus
member=GetNameOwner dest=org.freedesktop.DBus spid=7820
scontext=user_u:system_r:initrc_t:s0
tcontext=system_u:system_r:init_t:s0 tclass=dbus :
exe="/bin/dbus-daemon" (sauid=81, hostname=?, addr=?, terminal=?)'
type=USER_AVC msg=audit(1231052785.992:850): user pid=2489 uid=81
auid=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  {
send_msg } for msgtype=method_call interface=org.freedesktop.Hal.Device
member=Rescan dest=org.freedesktop.Hal spid=7820 tpid=3667
scontext=user_u:system_r:initrc_t:s0
tcontext=system_u:system_r:init_t:s0 tclass=dbus :
exe="/bin/dbus-daemon" (sauid=81, hostname=?, addr=?, terminal=?)'
type=USER_AVC msg=audit(1231052785.993:851): user pid=2489 uid=81
auid=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  {
send_msg } for msgtype=method_return dest=:1.14 spid=3667 tpid=7820
scontext=system_u:system_r:init_t:s0
tcontext=user_u:system_r:initrc_t:s0 tclass=dbus :
exe="/bin/dbus-daemon" (sauid=81, hostname=?, addr=?, terminal=?)'
type=USER_AVC msg=audit(1231052785.994:852): user pid=2489 uid=81
auid=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  {
send_msg } for msgtype=method_call interface=org.freedesktop.DBus
member=RemoveMatch dest=org.freedesktop.DBus spid=7820
scontext=user_u:system_r:initrc_t:s0
tcontext=system_u:system_r:init_t:s0 tclass=dbus :
exe="/bin/dbus-daemon" (sauid=81, hostname=?, addr=?, terminal=?)'


If I set the system to Enforcing mode - and log out and log back in -
the login seems to run very slowly. If I try to run the gui SELinux
Troubleshooter - the application window doesn't come up - but I see the
following errors in the boot.log file.

Jan 3 16:55:54 C5 dbus: avc: received setenforce notice (enforcing=1)
Jan 3 16:56:23 C5 userhelper[24703]: running
'/usr/share/system-config-securitylevel/system-config-securitylevel.py'
with system_u:system_r:unconfined_t context Jan 3 16:56:23 C5
userhelper[24703]: running
'/usr/share/system-config-securitylevel/system-config-securitylevel.py'
with root privileges on behalf of 'root'
Jan 3 16:58:02 C5 gconfd (root-21790): Exiting
Jan 3 16:58:02 C5 sshd[21044]: pam_unix(sshd:session): session closed
for user nx
Jan 3 16:58:02 C5 su: pam_unix(su-l:session): session closed for user root 
Jan 3 16:58:23 C5 sshd[24747]: Accepted publickey for nx from
192.168.0.2 port 33869 ssh2
Jan 3 16:58:23 C5 sshd[24747]: pam_unix(sshd:session): session opened
for user nx by (uid=0)
Jan 3 16:58:25 C5 su: pam_unix(su-l:session): session opened for user
root by (uid=102)
Jan 3 16:58:28 C5 dovecot: IMAP(tim): Disconnected: Logged out
Jan 3 16:58:30 C5 gconfd (root-25493): starting (version 2.14.0), pid
25493 user 'root'
Jan 3 16:58:30 C5 gconfd (root-25493): Resolved address
"xml:readonly:/etc/gconf/gconf.xml.mandatory" to a read-only
configuration source at position 0
Jan 3 16:58:30 C5 gconfd (root-25493): Resolved address
"xml:readwrite:/root/.gconf" to a writable configuration source at
position 1
Jan 3 16:58:30 C5 gconfd (root-25493): Resolved address
"xml:readonly:/etc/gconf/gconf.xml.defaults" to a read-only
configuration source at position 2
Jan 3 16:58:33 C5 pcscd: winscard.c:304:SCardConnect() Reader E-Gate 0 0 
Not Found
Jan 3 16:58:33 C5 last message repeated 4 times
Jan 3 16:58:33 C5 gconfd (root-25493): Resolved address
"xml:readwrite:/root/.gconf" to a writable configuration source at
position 0
Jan 3 16:59:46 C5 gdm[4045]: pam_unix(gdm:session): session opened for
user root by (uid=0)
Jan 3 16:59:59 C5 pcscd: winscard.c:304:SCardConnect() Reader E-Gate 0 0 
Not Found
Jan 3 16:59:59 C5 last message repeated 4 times
Jan 3 17:00:01 C5 crond[25738]: (root) CMD (/var/www/sarg/sarg.cron >
/dev/null 2>&1)
Jan 3 17:00:01 C5 crond[25740]: (root) CMD
(/etc/webmin/webalizer/webalizer.pl /var/log/squid/access.log)
Jan 3 17:00:01 C5 crond[25742]: (root) CMD (/etc/webmin/status/monitor.pl) 
Jan 3 17:00:01 C5 crond[25743]: (root) CMD
(/etc/webmin/fetchmail/check.pl --mail rchapman\@aardvark\.com\.au
--errors)
Jan 3 17:00:01 C5 su: pam_unix(su:session): session opened for user
richard by (uid=0)
Jan 3 17:00:04 C5 su: pam_unix(su:session): session opened for user
postgres by (uid=0)
Jan 3 17:00:04 C5 su: pam_unix(su:session): session closed for user
postgres
Jan 3 17:00:13 C5 su: pam_unix(su:session): session closed for user richard 
Jan 3 17:01:01 C5 crond[25911]: (root) CMD (run-parts /etc/cron.hourly)
Jan 3 17:01:15 C5 userhelper[25928]: running
'/usr/share/system-config-securitylevel/system-config-securitylevel.py'
with system_u:system_r:unconfined_t context Jan 3 17:01:15 C5
userhelper[25928]: running
'/usr/share/system-config-securitylevel/system-config-securitylevel.py'
with root privileges on behalf of 'root'
Jan 3 17:02:18 C5 setroubleshoot: [dbus.ERROR] could not start dbus: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the 
reply timeout expired, or the network connection was broken.
Jan 3 17:03:06 C5 dovecot: imap-login: Login: user=<tim>, method=PLAIN,
rip=192.168.0.199, lip=192.168.0.201
Jan 3 17:03:37 C5 dovecot: IMAP(tim): Disconnected: Logged out
Jan 3 17:04:14 C5 setroubleshoot: [dbus.ERROR] could not start dbus: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the 
reply timeout expired, or the network connection was broken.

I have also tried the comand line sealert application - which runs fine
- but shows no problems:

[root@C5 <mailto:root@C5> ~]# sealert -a /var/log/audit/audit.log
100% donefound 0 alerts in /var/log/audit/audit.log
[root@C5 <mailto:root@C5> ~]#
It looks to me as if there is some problem (possibly a policy issue)
with my dbus connection. and this is preventing the selinux
troubleshooter operating in enforcing mode - and also probably causing
some other problems in enforcing mode - though no "type-avc" problems
show up int eh audit logs.

Can anyone explain to me what "type=user_avc" messages are - and why
they are not reported by teh gui SELinux troubleshooter or sealert? How
should I debug the remainig issues in theis system?

All adice appreciated.

Richard.



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Please make sure your labeling is correct.

touch /.autorelabel; reboot

Looks like the entire system is running with a signal context which is
causing you your problems.

You might also want to grab the 5.3 policy, a preview is currently
available on

http://people.redhat.com/dwalsh/SELinux/RHEL5
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