root login

Nick D'angelo_3 — Mon, 07 Feb 2000 11:27:26 GMT

I would like to configure a script likely, that will email me when someone has
tried to logon as root and failed.

Thanks,

Nickd

Re: root login

Andrew Schafer_2 — Mon, 07 Feb 2000 13:26:47 GMT

Hi Nick,

All bad logins are stored in the /var/adm/btmp in a binary format. To show
these in a readable format, you use the lastb command (similar to the last
command for successful logins).

For example:

fred:/var/adm # lastb
asdf pts/0 Tue Feb 8 07:58
asdf pts/0 Tue Feb 8 07:58
root pts/0 Tue Feb 8 07:58
root pts/tc Fri Feb 4 15:05
root pts/tc Fri Feb 4 15:05

As far as scripting it goes, it depends on how quickly you want to get this
information. To be honest, I can't think of an easy way to trigger this
instantly.

What you can do though is schedule a cron job to check if the btmp file has
changed and display the last records since changing. Or, if you don't want the
info in it you can empty the file each time and just do a lastb to show
everything in it. This will also help maintain the size of the file.

You could set this to run every minute, or once a day to produce a report each
morning.

You may also want to look at the security and auditing options available
through SAM. If you are running a trusted system (C2 level security) then you
can do more in terms of auditing.

Hope this helps...

Cheers,
Andrew Schafer
Australian Response Centre

Re: root login

Anthony Goonetilleke_1 — Mon, 07 Feb 2000 21:23:11 GMT

Probably a good idea is to disable root login from anything other than the
console via /etc/securetty then you can monitor the sulog by doing something
like this from a cron job

grep " - " /var/adm/sulog | grep -i root | mail username

This will give you all bad su attempts, change the - to a + for all the good
attempts.

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