Re: Early processes (daemons) do not report audit events

[Kangkook Jee <aixer77@gmail.com>]

[-- Attachment #1.1: Type: text/plain, Size: 6011 bytes --]

Hi Richard,

I also did the same experiment for the latest distributions of Fedora core and Debian and here’s the results.

Fedora-22 (64-bit, 4.0.4-301.fc22.x86_64): Problem reproduced.
Debian-8 (64-bit, 3.16.0-4-amd64): Problem reproduced

Btw, Burn Alting (burn@swtf.dyndns.org) suggested me to append audit=1 to kernel flag. I added the option to boot-loader (grub) and problem went away. 

Regards, Kangkook


> On Sep 11, 2015, at 12:24 PM, Richard Guy Briggs <rgb@redhat.com> wrote:
> 
> On 15/09/11, Kangkook Jee wrote:
>> From the previous reply, I think I misunderstood your question regarding kernel command line. 
>> Here’s "cat /proc/cmdline” results for distributions that I’ve experimented. 
>> 
>> Ubuntu 14.04 (64-bit): 
>>    BOOT_IMAGE=/boot/vmlinuz-3.13.0-58-generic root=UUID=7505f862-ce46-49e5-9d1c-e4e307844889 ro text quiet splash vt.handoff=7
>> 
>> Ubuntu 12.04 (64-bit): 
>>    BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic root=UUID=5be789be-9b0c-463e-bd18-42bfa79fb24c ro quiet splash
>> 
>> CentOS 7 (64-bit): 
>>    BOOT_IMAGE=/vmlinuz-3.10.0-229.el7.x86_64 root=/dev/mapper/centos-root ro rd.lvm.lv=centos/root rd.lvm.lv=centos/swap crashkernel=auto rhgb quiet LANG=en_US.UTF-8
>> 
>> CentOS 6 (64-bit): 
>>    ro root=UUID=a7d44560-adcc-4000-9584-8b9fcf2afd74 rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=129M@0M  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
>> 
>> I don’t see any audit=<value> entries from all examples above. 
> 
> Yes, this is what I was seeking from you.  And you are correct, none of
> them have audit=1 as I was hoping from at least CentOS.  There is a
> chance that the CentOS kernel was compiled with audit=1 hardcoded, but I
> think that is a pretty small chance...
> 
> I'll have to look at this closer...  But any Debian and Fedora data
> points that you can provide would certainly be useful.
> 
>> /Kangkook
>> 
>>> On Sep 11, 2015, at 5:50 AM, Richard Guy Briggs <rgb@redhat.com> wrote:
>>> 
>>> On 15/09/10, Kangkook Jee wrote:
>>>> Hi all,
>>>> 
>>>> I debugged a bit further to identify distributions that are affected by the issue.
>>>> I repeated the same experiment with sshd from 3 more distributions.
>>>> 
>>>> CentOS Linux release 7.1.1503 (64-bit, 3.10.0-229.el7.x86_64): Problem NOT reproduced
>>>> CentOS release 6.6 (64-bit, 2.6.32-504.el6.x86_64): Problem NOT reproduced
>>>> Ubuntu 12.04.5 LTS (64-bit, 3.13.0-32-generic): Problem reproduced
>>> 
>>> For each of these examples, what is the value of the kernel command line
>>> "audit=<value>" if it is even present?  It is possible that the CentOS
>>> examples include "audit=1" while Ubuntu omits the line.  "cat
>>> /proc/cmdline" should tell you the answer.
>>> 
>>>> After all, Ubuntu family are affected by the issue and I could confirm
>>>> that results are inconsistent across two different distribution
>>>> families. 
>>> 
>>> I would be curious what your results are with a recent Debian and with a
>>> recent Fedora.
>>> 
>>>> If you can let us know how can we workaround the issue, it will be a great help.
>>>> 
>>>> Regards, Kangkook
>>>> 
>>>> 
>>>>> On Sep 9, 2015, at 11:50 PM, Kangkook Jee <aixer77@gmail.com> wrote:
>>>>> 
>>>>> Dear all,
>>>>> 
>>>>> We are developing custom user space audit agent to gather system wide system
>>>>> call trace. While experimenting with various programs, we found out that
>>>>> processes (daemons) that started early (along with the system bootstrapping) do
>>>>> not report any audit events at all. These processes typically fall into PID
>>>>> range of less than 2000. Here’s how I reproduced the symptom with sshd daemon.
>>>>> 
>>>>> 1. Reboot the system
>>>>> 
>>>>> 2. Add and enable audit events
>>>>>  # /sbin/auditctl -a exit,always -F arch=b64 -S clone -S close -S creat -S dup
>>>>>         -S dup2 -S dup3 -S execve -S exit -S exit_group -S fork -S open -S openat 
>>>>>         -S unlink -S unlinkat -S vfork -S 288 -S accept -S bind -S connect 
>>>>>         -S listen -S socket -S socketpair
>>>>>  # /sbin/auditctl -e1 -b 102400
>>>>> 
>>>>> 3. Connect to the system via ssh
>>>>>   Audit messages generated only from child processes and none are seen from
>>>>>   the original daemon.
>>>>> 
>>>>> 4. Restart sshd 
>>>>>   # restart ssh
>>>>> 
>>>>> 5. Connect again to the system via ssh
>>>>>  Now, we see audit messages from both parent and child processes.
>>>>> 
>>>>> I did the experiment from Ubuntu 14.04.2 LTS distribution (64-bit, kernel
>>>>> version 3.13.0-58-generic).
>>>>> 
>>>>> I first wonder whether this is intended behavior of audit framework or
>>>>> not. If it is intended, I also want to know how can we configure auditd
>>>>> differently to capture system calls from all processes. 
>>>>> 
>>>>> Thanks a lot for your help in advance!
>>>>> 
>>>>> Regards, Kangkook
>>>>> 
>>>> 
>>> 
>>>> --
>>>> Linux-audit mailing list
>>>> Linux-audit@redhat.com <mailto:Linux-audit@redhat.com> <mailto:Linux-audit@redhat.com <mailto:Linux-audit@redhat.com>>
>>>> https://www.redhat.com/mailman/listinfo/linux-audit <https://www.redhat.com/mailman/listinfo/linux-audit> <https://www.redhat.com/mailman/listinfo/linux-audit <https://www.redhat.com/mailman/listinfo/linux-audit>>
>>> 
>>> 
>>> - RGB
>>> 
>>> --
>>> Richard Guy Briggs <rbriggs@redhat.com <mailto:rbriggs@redhat.com> <mailto:rbriggs@redhat.com <mailto:rbriggs@redhat.com>>>
>>> Senior Software Engineer, Kernel Security, AMER ENG Base Operating Systems, Red Hat
>>> Remote, Ottawa, Canada
>>> Voice: +1.647.777.2635, Internal: (81) 32635, Alt: +1.613.693.0684x3545
>> 
> 
> - RGB
> 
> --
> Richard Guy Briggs <rbriggs@redhat.com <mailto:rbriggs@redhat.com>>
> Senior Software Engineer, Kernel Security, AMER ENG Base Operating Systems, Red Hat
> Remote, Ottawa, Canada
> Voice: +1.647.777.2635, Internal: (81) 32635, Alt: +1.613.693.0684x3545


[-- Attachment #1.2: Type: text/html, Size: 20857 bytes --]

[-- Attachment #2: Type: text/plain, Size: 0 bytes --]