Re: strange systemd audit message

[Dominick Grift <dac.override@gmail.com>]

Chris PeBenito <pebenito@ieee.org> writes:

> On 1/30/19 8:02 AM, Russell Coker wrote:
>> I'm seeing the following every time I login as sysadm_r, whether it's via /
>> bin/login or sshd.  But the login works correctly anyway.  Any suggestions for
>> what I should investigate?
>>
>> type=PROCTITLE msg=audit(30/01/19 23:58:01.196:1595535) : proctitle=(systemd)
>> type=SYSCALL msg=audit(30/01/19 23:58:01.196:1595535) : arch=x86_64
>> syscall=execve success=no exit=EACCES(Permission denied) a0=0x55f2c3008780
>> a1=0x55f2c2fbe740 a2=0x55f2c302f1e0 a3=0x55f2c2e06010 items=0 ppid=1 pid=19802
>> auid=root uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root
>> fsgid=root tty=(none) ses=189 comm=(systemd) exe=/lib/systemd/systemd
>> subj=system_u:system_r:init_t:s0 key=(null)
>> type=AVC msg=audit(30/01/19 23:58:01.196:1595535) : avc:  denied  { transition
>> } for  pid=19802 comm=(systemd) path=/lib/systemd/systemd dev="dm-0"
>> ino=3069920 scontext=system_u:system_r:init_t:s0
>> tcontext=root:sysadm_r:sysadm_t:s0 tclass=process permissive=0
>
> I never login directly as sysadm, but now that I try, I see it too.
> I'm unaware of why this is happening; I'd have to look at the code to
> try to figure it out.

I think its the systemd --user instance spawned by systemd --system on
behalf of root. Basically systemd --system pam code reads /etc/pam.d/systemd-user which calls pam_selinux
and then ends up interpretting either failsafe_context or default_contexts 

Just a guess though. Baasically it boils down to not having support
for systemd --user functionality in the policy.

-- 
Key fingerprint = 5F4D 3CDB D3F8 3652 FBD8 02D5 3B6C 5F1D 2C7B 6B02
https://sks-keyservers.net/pks/lookup?op=get&search=0x3B6C5F1D2C7B6B02
Dominick Grift