Search this site





ssh honeypot auditing

I've only gotten a few hits on my honey pot, and none of the bots seem to be doing much. I think it might be because the shell I have setup doesn't behave correctly. Here's the new one:
d="$(date "+%Y%m%d-%H%M%S")"
env > $logfile
echo "Args: $*" >> $logfile
export SHELL=/bin/bash
script -c "$SHELL $*" -q -a $logfile
This will log the env vars in addition to the arguments passed to the shell. Thus far, I've see 2 patterns of environment variables.

This new version supports arguments, so that things like 'ssh [email protected] somecommand' works. The next step is probably to have a setuid program chown the logfile to root shortly after script(1) starts, so that you can't remove your own log. I'll only bother with that if it's necessary.

In addition to the shell change, I started looking into the audit facility in Linux. I want to log all command execution, in case my script(1) idea fails. To do this, I added these rules with auditctl:

auditctl -a exit,always -F uid=60000 -S open
auditctl -a exit,always -F uid=60000 -S execve
auditctl -a exit,always -F uid=60000 -S vfork
auditctl -a exit,always -F uid=60000 -S fork
auditctl -a exit,always -F uid=60000 -S clone
I'm not entirely sure if this will specifically catch the execs I'm looking for, but it does seem to work:
% ausearch -sc execve | grep EXECVE
type=EXECVE msg=audit(1199138086.041:3293): a0="/bin/bash" a1="-c" a2="uptime"-
type=EXECVE msg=audit(1199138086.056:3300): a0="uptime"-