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Security

Anything to do with computer or physical security.

Installing Zoneminder on Ubuntu 11.04

I have been experimenting with Zoneminder recently, using the pre-built package for Ubuntu 11.04. I couldn’t get the package to work properly but found some very useful instructions in the Zoneminder Wiki that made it work. When I finish the installation I will put this into an install script.    

Ubuntu 10.10 SSH login message fix

Do you get two welcome messages when logging in to your Ubuntu 10.10 host? I have experienced it on hosts upgraded from 10.04 and on freshly built hosts from the downloaded CD-ROM images. The problem can be easily fixed using… sudo rm /etc/motd.tail If you are still using password based login for SSH, consider using […]

Securing the list of last logged in users

The command ‘last‘ lists the times and dates of successful logins. The command ‘lastb‘ lists unsuccessful attempts. I found that both unnecessarily had public read access on most of my Ubuntu servers. Two log files provide the data used by last and lastb. Both can be secured by changing the permission to 660. sudo ls […]

Restricting access to ftpd

Whether the ftp daemon is in use or not on a Linux host, it’s a good idea to restrict the system user accounts from using it. Any user ID that is in /etc/passwd that is not permitted to use ftp should be copied to /etc/ftpusers. The following commands for Ubuntu create the file with a […]