Duplicate settings?

Duplicate settings?

[Leam Hall]

If /etc/audit/auditd.conf encounters conflicting duplicate settings, 
what happens? Takes the first, takes the last, or what? For example:

	space_left = 25
	space_left = 100

Thanks!

Re: Duplicate settings?

[Steve Grubb]

On Monday, January 20, 2020 9:24:56 AM EST Leam Hall wrote:
> If /etc/audit/auditd.conf encounters conflicting duplicate settings,
> what happens? Takes the first, takes the last, or what? For example:
> 
> 	space_left = 25
> 	space_left = 100

It overwrites the first value with the second one. You can also run:

# service auditd state

to see what the current value is if your audit daemon is somewhat recent.

-Steve

Re: Duplicate settings?

[Leam Hall]

On 1/20/20 9:37 AM, Steve Grubb wrote:
> On Monday, January 20, 2020 9:24:56 AM EST Leam Hall wrote:
>> If /etc/audit/auditd.conf encounters conflicting duplicate settings,
>> what happens? Takes the first, takes the last, or what? For example:
>>
>> 	space_left = 25
>> 	space_left = 100
> 
> It overwrites the first value with the second one. You can also run:
> 
> # service auditd state
> 
> to see what the current value is if your audit daemon is somewhat recent.

Hey Steve, thanks! We're on the default RHEL/CentOS 7 auditd, and 
"state" doesn't show space_left.

Leam

Re: Duplicate settings?

[Steve Grubb]

On Monday, January 20, 2020 10:00:06 AM EST Leam Hall wrote:
> On 1/20/20 9:37 AM, Steve Grubb wrote:
> > On Monday, January 20, 2020 9:24:56 AM EST Leam Hall wrote:
> >> If /etc/audit/auditd.conf encounters conflicting duplicate settings,
> >> 
> >> what happens? Takes the first, takes the last, or what? For example:
> >> 	space_left = 25
> >> 	space_left = 100
> > 
> > It overwrites the first value with the second one. You can also run:
> > 
> > # service auditd state
> > 
> > to see what the current value is if your audit daemon is somewhat recent.
> 
> Hey Steve, thanks! We're on the default RHEL/CentOS 7 auditd, and
> "state" doesn't show space_left.

2.8.5 and later should have it. You have to be in daemon mode and write_logs 
enabled.

-Steve

Re: Duplicate settings?

[Leam Hall]

On 1/20/20 9:37 AM, Steve Grubb wrote:
> On Monday, January 20, 2020 9:24:56 AM EST Leam Hall wrote:
>> If /etc/audit/auditd.conf encounters conflicting duplicate settings,
>> what happens? Takes the first, takes the last, or what? For example:
>>
>> 	space_left = 25
>> 	space_left = 100
> 
> It overwrites the first value with the second one. You can also run:
> 
> # service auditd state
> 
> to see what the current value is if your audit daemon is somewhat recent.
> 
> -Steve

Hey Steve, a follow up. Is the man page for auditd.conf wrong? My auditd 
failed to start when giving space_left with a '%' sign.

  space_left
     This is a numeric value in megabytes that tells the audit daemon
     when  to  perform  a  configurable  action because the system is
     starting to run low on disk space. You may also append a percent
     sign  (e.g. 5%) to the number to have the audit daemon calculate
     the number based on the disk partition size.


Thanks!

Leam

Re: Duplicate settings?

[Steve Grubb]

On Monday, January 20, 2020 10:04:24 AM EST Leam Hall wrote:
> On 1/20/20 9:37 AM, Steve Grubb wrote:
> > On Monday, January 20, 2020 9:24:56 AM EST Leam Hall wrote:
> >> If /etc/audit/auditd.conf encounters conflicting duplicate settings,
> >> what happens? Takes the first, takes the last, or what? For example:
> >> 
> >> space_left = 25
> >> space_left = 100
> > 
> > It overwrites the first value with the second one. You can also run:
> > 
> > # service auditd state
> > 
> > to see what the current value is if your audit daemon is somewhat recent.
> > 
> > -Steve
> 
> Hey Steve, a follow up. Is the man page for auditd.conf wrong? My auditd
> failed to start when giving space_left with a '%' sign.

Usually it writes the reason why in syslog. Does it say anything there?

-Steve

Re: Duplicate settings?

[Leam Hall]

On 1/20/20 10:14 AM, Steve Grubb wrote:
> On Monday, January 20, 2020 10:04:24 AM EST Leam Hall wrote:
>> On 1/20/20 9:37 AM, Steve Grubb wrote:
>>> On Monday, January 20, 2020 9:24:56 AM EST Leam Hall wrote:
>>>> If /etc/audit/auditd.conf encounters conflicting duplicate settings,
>>>> what happens? Takes the first, takes the last, or what? For example:
>>>>
>>>> space_left = 25
>>>> space_left = 100
>>>
>>> It overwrites the first value with the second one. You can also run:
>>>
>>> # service auditd state
>>>
>>> to see what the current value is if your audit daemon is somewhat recent.
>>>
>>> -Steve
>>
>> Hey Steve, a follow up. Is the man page for auditd.conf wrong? My auditd
>> failed to start when giving space_left with a '%' sign.
> 
> Usually it writes the reason why in syslog. Does it say anything there?
> 
> -Steve

I don't grok systemd, so here's the whole response:

Redirecting to /bin/systemctl status auditd.service
● auditd.service - Security Auditing Service
    Loaded: loaded (/usr/lib/systemd/system/auditd.service; enabled; 
vendor preset: enabled)
    Active: failed (Result: exit-code) since Mon 2020-01-20 09:27:37 
EST; 19min ago
      Docs: man:auditd(8)
            https://github.com/linux-audit/audit-documentation
   Process: 2695 ExecStart=/sbin/auditd (code=exited, status=6)

Jan 20 09:27:36 leam_c7 systemd[1]: Starting Security Auditing Service...
Jan 20 09:27:37 leam_c7 auditd[2695]: Value 25% should only be numbers - 
line 20
Jan 20 09:27:37 leam_c7 auditd[2695]: The audit daemon is exiting.
Jan 20 09:27:37 leam_c7 systemd[1]: auditd.service: control process 
exited, code=exited status=6
Jan 20 09:27:37 leam_c7 systemd[1]: Failed to start Security Auditing 
Service.
Jan 20 09:27:37 leam_c7 systemd[1]: Unit auditd.service entered failed 
state.
Jan 20 09:27:37 leam_c7 systemd[1]: auditd.service failed.



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Re: Duplicate settings?

[Steve Grubb]

On Monday, January 20, 2020 10:19:59 AM EST Leam Hall wrote:
> On 1/20/20 10:14 AM, Steve Grubb wrote:
> > On Monday, January 20, 2020 10:04:24 AM EST Leam Hall wrote:
> >> On 1/20/20 9:37 AM, Steve Grubb wrote:
> >>> On Monday, January 20, 2020 9:24:56 AM EST Leam Hall wrote:
> >>>> If /etc/audit/auditd.conf encounters conflicting duplicate settings,
> >>>> what happens? Takes the first, takes the last, or what? For example:
> >>>> 
> >>>> space_left = 25
> >>>> space_left = 100
> >>> 
> >>> It overwrites the first value with the second one. You can also run:
> >>> 
> >>> # service auditd state
> >>> 
> >>> to see what the current value is if your audit daemon is somewhat
> >>> recent.
> >> 
> >> Hey Steve, a follow up. Is the man page for auditd.conf wrong? My auditd
> >> failed to start when giving space_left with a '%' sign.
> > 
> > Usually it writes the reason why in syslog. Does it say anything there?
> 
> I don't grok systemd, so here's the whole response:
> 
> Redirecting to /bin/systemctl status auditd.service
> ● auditd.service - Security Auditing Service
>     Loaded: loaded (/usr/lib/systemd/system/auditd.service; enabled;
> vendor preset: enabled)
>     Active: failed (Result: exit-code) since Mon 2020-01-20 09:27:37
> EST; 19min ago
>       Docs: man:auditd(8)
>             https://github.com/linux-audit/audit-documentation
>    Process: 2695 ExecStart=/sbin/auditd (code=exited, status=6)
> 
> Jan 20 09:27:36 leam_c7 systemd[1]: Starting Security Auditing Service...
> Jan 20 09:27:37 leam_c7 auditd[2695]: Value 25% should only be numbers -
> line 20

The issue is here ^^^  To use percentages, you have to be on 2.8.5 or later.

-Steve



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Re: Duplicate settings?

[Leam Hall]

On 1/20/20 10:28 AM, Steve Grubb wrote:
> On Monday, January 20, 2020 10:19:59 AM EST Leam Hall wrote:
>> On 1/20/20 10:14 AM, Steve Grubb wrote:
>>> On Monday, January 20, 2020 10:04:24 AM EST Leam Hall wrote:
>>>> On 1/20/20 9:37 AM, Steve Grubb wrote:
>>>>> On Monday, January 20, 2020 9:24:56 AM EST Leam Hall wrote:
>>>>>> If /etc/audit/auditd.conf encounters conflicting duplicate settings,
>>>>>> what happens? Takes the first, takes the last, or what? For example:
>>>>>>
>>>>>> space_left = 25
>>>>>> space_left = 100
>>>>>
>>>>> It overwrites the first value with the second one. You can also run:
>>>>>
>>>>> # service auditd state
>>>>>
>>>>> to see what the current value is if your audit daemon is somewhat
>>>>> recent.
>>>>
>>>> Hey Steve, a follow up. Is the man page for auditd.conf wrong? My auditd
>>>> failed to start when giving space_left with a '%' sign.
>>>
>>> Usually it writes the reason why in syslog. Does it say anything there?
>>
>> I don't grok systemd, so here's the whole response:
>>
>> Redirecting to /bin/systemctl status auditd.service
>> ● auditd.service - Security Auditing Service
>>      Loaded: loaded (/usr/lib/systemd/system/auditd.service; enabled;
>> vendor preset: enabled)
>>      Active: failed (Result: exit-code) since Mon 2020-01-20 09:27:37
>> EST; 19min ago
>>        Docs: man:auditd(8)
>>              https://github.com/linux-audit/audit-documentation
>>     Process: 2695 ExecStart=/sbin/auditd (code=exited, status=6)
>>
>> Jan 20 09:27:36 leam_c7 systemd[1]: Starting Security Auditing Service...
>> Jan 20 09:27:37 leam_c7 auditd[2695]: Value 25% should only be numbers -
>> line 20
> 
> The issue is here ^^^  To use percentages, you have to be on 2.8.5 or later.

Ah, gotcha! I was using a rebuildable VM for testing, and hadn't 
updated. Thanks!

Leam


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