Charly's Column The sys admin’s daily grind: WebCalendar

Jun 20, 2008

Users log on to services such as SSH, ftp, SASL, POP3, IMAP, Apache htaccess, and many more using their names and passwords. These popular access mechanisms are a potential target for brute-force attacks. An attentive bouncer will keep dictionary attacks at bay.

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Single-Packet Port Knocking Remote access security with single-packet port knocking

May 31, 2008

If you are looking for an extra layer of remote access security, try single-packet port knocking.

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Access Control Lists Working with Access Control Lists

May 31, 2008

The ancient Linux permission system is often insufficient for complex production environments. Access Control Lists offer a flexible alternative.

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SE Linux Mandatory Access Control (MAC) with SELinux

May 31, 2008

SELinux provides a safer system through the powerful concept of mandatory access controls.

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Sshutout and Fail2ban Fighting dictionary attacks with Sshutout and Fail2ban

May 31, 2008

Services that require a username and password for login are potential targets for dictionary attacks. Sshutout and Fail2ban introduce time penalties for invalid attempts.

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Two GnuTLS Bugfix Releases

May 21, 2008

The GnuTLS project has published two bugfix releases to close several vulnerabilities and resolve an error capable of interrupting connections.

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Code Analysis: Open Source Keeps on Improving

May 20, 2008

The security and quality of Open Source software just keeps on improving, as code analysis by Coverity reveals.

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X Server without Root Privileges?

May 15, 2008

Red Hat's David Airlie reports in his blog that a simple hack allowed him to develop an X server without root privileges in the course of just one afternoon.

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