ntpd vs selinux

[Gene Heskett]

Paul Howarth wrote:
> On Fri, 2006-06-30 at 22:58 -0500, Gene Heskett wrote:
>> Greetings;
>>
>> It appears that the last selinux update has killed ntpd, as shown from 
>> my messages log:
>>
>> Jun 30 22:37:14 diablo ntpd[1936]: sendto(194.145.249.108): Invalid argument
>> Jun 30 22:38:01 diablo ntpd[1936]: sendto(194.102.249.64): Invalid argument
>> Jun 30 22:42:04 diablo ntpd[1936]: sendto(193.40.133.134): Invalid argument
>>
>> I have several pages of the above.
>>
>> So to get a clean restart, I did a restart, and this error was logged.
>>
>> Jun 30 22:52:34 diablo ntpd[1936]: ntpd exiting on signal 15
>> Jun 30 22:52:35 diablo kernel: audit(1151725955.188:14): avc:  denied  { 
>> read } for  pid=23841 comm="ntpd" name=".fonts.cache-2" dev=hda5 
>> ino=11556042 scontext=root:system_r:ntpd_t:s0 
>> tcontext=root:object_r:user_home_t:s0 tclass=file
> 
> This avc is about ntpd being refused access to a .fonts.cache-2 file in
> someone's home directory. Why it would be trying to access that I don't
> know, but it has no business doing so.
> 
>> Jun 30 22:52:35 diablo ntpd[23842]: ntpd 4.2.0a at 1.1196-r Thu May 11 
>> 09:19:35 EDT 2006 (1)
>> Jun 30 22:52:35 diablo ntpd[23842]: precision = 6.000 usec
>> Jun 30 22:52:35 diablo ntpd[23842]: Listening on interface wildcard, 
>> 0.0.0.0#123
>> Jun 30 22:52:35 diablo ntpd[23842]: Listening on interface wildcard, ::#123
>> Jun 30 22:52:35 diablo ntpd[23842]: Listening on interface lo, 127.0.0.1#123
>> Jun 30 22:52:35 diablo ntpd[23842]: Listening on interface wlan0, 
>> 192.168.1.105#123
>> Jun 30 22:52:35 diablo ntpd[23842]: kernel time sync status 0040
>> Jun 30 22:52:36 diablo ntpd[23842]: frequency initialized -14.140 PPM 
>> from /var/lib/ntp/drift
> 
> It would appears that the avc did not prevent the startup of ntpd in any
> case.
> 
>> I assume something in yesterdays selinux update has done this, but I've 
>> now forgotten the magic phrase to invoke from the cli to cause a fix.
>>
>> Can someone refresh my memory?
> 
> Try switching to permissive mode and restart ntpd:
> 
> # setenforce 0
> # service ntpd restart
> 
> If ntpd is still not working, the problem lies elsewhere than SELinux.
> 
> Try re-enabling enforcing mode:
> 
> # setenforce 1
> 
> This may or may not make a difference, depending on whether:
> 1. It was an SELinux issue in the first place,
> 2. It was a startup issue, or
> 3. It was a regular runtime issue.
> 
> Paul.
> 
Whatever it was Paul, it appears that the restart was sufficient to fix 
it, those messages are no longer being logged. Shortly after that 
snippet was pasted, I got this:
Jun 30 22:55:53 diablo ntpd[23842]: synchronized to LOCAL(0), stratum 10
Jun 30 22:55:53 diablo ntpd[23842]: kernel time sync disabled 0041
Jun 30 22:56:57 diablo ntpd[23842]: synchronized to 194.146.145.193, 
stratum 2
Jun 30 23:02:18 diablo ntpd[23842]: kernel time sync enabled 0001
Jun 30 23:11:12 diablo kernel: audit(1151727072.318:15): avc:  denied  { 
execmod } for  pid=23946 comm="firefox-bin" name="libflashplayer.so" 
dev=hda5 ino=11686771 scontext=root:system_r:unconfined_t:s0-s0:c0.c255 
tcontext=root:object_r:user_home_t:s0 tclass=file

But as I'd  fired up firefox to do my nightly tour, it did log the above 
  over the flashplayer lib.  Whats the fix there?

Thanks.

-- 
Cheers, Gene