Question about excluding rules

[Steve Grubb]

On Thursday, February 20, 2020 6:36:46 PM EST Moshe Rechtman wrote:
> Hello Experts,
> 
> We have a big customer that facing the following issue on RHEL 6.2.
> As per customer request I've configured the following rules:
> 
> $ cat audit.rules
> 
> # This file contains the auditctl rules that are loaded
> # whenever the audit daemon is started via the initscripts.
> # The rules are simply the parameters that would be passed
> # to auditctl.
> 
> # First rule - delete all
> -D
> 
> # Increase the buffers to survive stress events.
> # Make this bigger for busy systems
> -b 320
> 
> # Feel free to add below this line. See auditctl man page
> 
> -a exit,always -F arch=b64 -F euid=0 -S execve -k rootact
> -a exit,always -F arch=b32 -F euid=0 -S execve -k rootact
> -a exit,always -F arch=b64 -F euid>=500 -S execve -k useract
> -a exit,always -F arch=b32 -F euid>=500 -S execve -k useract
> 
> 
> Audit start working as expected. Now customer is asking to exclude/ignore
> the following from audit logs:
> 
> type=SYSCALL msg=audit(1581664357.597:257516): arch=c000003e
> syscall=59 success=yes exit=0 a0=3869161ea3 a1=7ffd15530c20
> a2=7ffd15534348 a3=3869617240 items=2 ppid=3350 pid=59266
> auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0
> fsgid=0 tty=(none) ses=4294967295 comm="sh" exe="/bin/bash"
> key="rootact"
> type=EXECVE msg=audit(1581664357.597:257516): argc=3 a0="sh" a1="-c"
> a2=2F62696E2F70732061757877777777
> type=CWD msg=audit(1581664357.597:257516): 
> cwd="/opt/microfocus/Discovery/bin" type=PATH
> msg=audit(1581664357.597:257516): item=0 name="/bin/sh" inode=398
> dev=fd:01 mode=0100755 ouid=0 ogid=0 rdev=00:00
> nametype=NORMAL
> type=PATH msg=audit(1581664357.597:257516): item=1 name=(null)
> inode=4481 dev=fd:01 mode=0100755 ouid=0 ogid=0 rdev=00:00
> nametype=NORMAL
> 
> ype=SYSCALL msg=audit(1581664357.601:257517): arch=c000003e syscall=59
> success=yes exit=0 a0=155c2f0 a1=155b8d0 a2=155b460 a3=18 items=2
> ppid=3350 pid=59266 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0
> egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="ps"
> exe="/bin/ps" key="rootact"
> type=EXECVE msg=audit(1581664357.601:257517): argc=2 a0="/bin/ps"
> a1="auxwwww" type=CWD msg=audit(1581664357.601:257517): 
> cwd="/opt/microfocus/Discovery/bin" type=PATH
> msg=audit(1581664357.601:257517): item=0 name="/bin/ps" inode=1451
> dev=fd:01 mode=0100755 ouid=0 ogid=0 rdev=00:00
> nametype=NORMAL
> type=PATH msg=audit(1581664357.601:257517): item=1 name=(null)
> inode=4481 dev=fd:01 mode=0100755 ouid=0 ogid=0 rdev=00:00
> nametype=NORMAL
> 
> What would be the best way to exclude such audit?
> Your help would be much appreciated.

What's objectionable about these events? The fact that its got a key says 
they think they wanted it.

-Steve