[BIND] RE: KSK Rollover

[Mark Elkins]

It would probably have been more helpful (speeded up finding the
problem) if the error message "file 'named.secroots': permission denied"
also gave the directory name that it was trying to write to? Just a thought.
Sometimes we don't see the obvious.


On 09/06/2018 10:58 PM, Brent Swingle wrote:
> I moved the file from /etc to /var/named and now I get an additional error line printed in /var/log/messages.
>
> Sep  6 15:44:40 ns3 named[15443]: received control channel command 'secroots'
> Sep  6 15:44:40 ns3 named[15443]: could not open secroots dump file 'named.secroots': permission denied
> Sep  6 15:44:40 ns3 named[15443]: dumpsecroots failed: permission denied
> Sep  6 15:44:40 ns3 audit: <audit-1400> { write } for  pid=15447 comm="named" name="named.secroots" dev="dm-0" ino=135707451 scontext=system_u:system_r:named_t:s0 tcontext=unconfined_u:object_r:etc_t:s0 tclass=file permissive=0
>
>
> This error also appears in the audit.log file and a search is pointing to SELinux as the hangup.  Any pointers on dealing with SELinux would be appreciated.
>
> type=AVC msg=audit(1536266680.663:75671): avc:  denied  { write } for  pid=15447 comm="named" name="named.secroots" dev="dm-0" ino=135707451 scontext=system_u:system_r:named_t:s0 tcontext=unconfined_u:object_r:etc_t:s0 tclass=file permissive=0
>
>
> I left all of the permissions the same and I think they should be lenient enough:
> [root at ns3 named]# ls -lh named.secroots
> -rw-rw-rw-. 1 named named 0 Sep  6 13:52 named.secroots
>
>
>
>
> -----Original Message-----
> From: Hugo Salgado-Hernández [mailto:hsalgado at nic.cl] 
> Sent: Thursday, September 06, 2018 3:39 PM
> To: Brent Swingle <brent at havilandtelco.com>
> Cc: Evan Hunt <each at isc.org>; bind-users at lists.isc.org
> Subject: Re: [BIND] RE: KSK Rollover
>
> Hi Brent.
> In out CentOS box, the named.secroots file is written on
>   /var/named/
>
> You should check permissions there too.
>
> Hugo
>
> On 20:32 06/09, Brent Swingle wrote:
>> Evan,
>>
>> I ran the command and followed the directions to build out rndc as you have suggested.  However, I am not sure that it made much of a difference.  I should have been a little clearer from the beginning.  I had worked with rndc to issue other commands and had received what appeared to be valid responses as if rndc was functional.  I had somewhat assumed that rndc was baked in behind the scenes and ready to go.  Either way I it has a rndc.conf and is specified in named.conf at this point.
>>
>> I have two of these servers that are identical from an SW perspective.  As a test, I issued "rndc secroots" on the server that I have modified to configure rndc and observed the following lines appear in the /var/log/messages file.  When I issued "rndc secroots" from the non-modified file I get the same 3 lines.  It acts like the process is running but it is unable to write output to the named.secroots file.
>>
>> Sep  6 14:33:13 ns2 named[31189]: received control channel command 'secroots'
>> Sep  6 14:33:13 ns2 named[31189]: could not open secroots dump file 
>> 'named.secroots': permission denied Sep  6 14:33:13 ns2 named[31189]: 
>> dumpsecroots failed: permission denied
>>
>>
>> As a test, I manually created named.secroots with weakened permissions to see if that made a difference but it still won't print output to it.
>> [root at ns3 etc]# ls -lh named.secroots
>> -rw-rw-rw-. 1 named named 0 Sep  6 13:52 named.secroots
>>
>>
>>
>> -----Original Message-----
>> From: Evan Hunt [mailto:each at isc.org]
>> Sent: Thursday, September 06, 2018 1:22 PM
>> To: Brent Swingle <brent at havilandtelco.com>
>> Cc: bind-users at lists.isc.org
>> Subject: Re: KSK Rollover
>>
>> On Thu, Sep 06, 2018 at 05:34:21PM +0000, Brent Swingle wrote:
>>> This is the command that does not work and the output received:
>>> [root at ns2 ~]# rndc secroots
>>> rndc: 'secroots' failed: permission denied
>>> [root at ns2 ~]#
>> Have you set up your server to accept rndc commands?
>>
>> If not, run "rndc-confgen" and follow the directions.
>>
>> --
>> Evan Hunt -- each at isc.org
>> Internet Systems Consortium, Inc.
>>
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-- 
Mark James ELKINS  -  Posix Systems - (South) Africa
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