Re: Auditd SYSCALL argument decoding
On Tue, 19 Nov 2019 17:24:21 +0000
Tim Galyean <tgalyean(a)splunk.com> wrote:
Hello,
As I understand it, long values recorded by auditd are stored as hex
encoded strings. However, when I attempt to decode arguments such as
a0 or a1 in SYSCALL events, they are decoded into special characters
instead of ASCII. Are these values encoded differently than PROCTITLE
events?
Below is an example log line:
type=SYSCALL msg=audit(1574182099.559:2002): arch=c000003e syscall=59
success=yes exit=0 a0=55df330a3c10 a1=55df330a3c78 a2=55df330a3c90
a3=0 items=3 ppid=29664 pid=29678 auid=1171 uid=0 gid=0 euid=0 suid=0
fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=170 comm="apt-check"
exe="/usr/bin/python3.5" key="rootcmd"
In this example, I am looking to decode a0, a1, and a2. Yes, it seems
that ausearch can decode these values. However, I am looking to
decode them via Splunk.
Please have auparse decode them. This is well maintained and accurate.
Sometimes they point to memory. Sometimes they have meaning. All of
this is encoded in the auparse library. Let me know if you have any
issues decoding anything via libauparse.
What format are these strings encoded in and is there a way to
decode these values in any other way other than by using ausearch?
Libauparse is what ausearch uses. It has all knowledge encoded within
it. It detangles intertwined events as well as normal events.
-Steve