Differences between auditd and Lynis Recently I received the question what the difference is between auditd and Lynis. Both focus on auditing, that part is clear. For someone not familiar with both software tools, the technical differences may not directly be obvious. Time to write about that, for everyone that has the same question. Comparing functionality Let’s start with a quick introduction in both tools. Audit daemon Auditd is the daemon process in the Linux Audit Framework, written and maintained by […]Read more
The auditd process is the auditing daemon related to the Linux audit framework. It enables monitoring file changes and the usage of specific systems calls on Linux. This section shows articles related to the framework.
The Linux Audit framework is a powerful tool to audit system events. From running executables up to system calls, everything can be logged. However, all this audit logging comes at the price of decreased system performance. Let’s have a look at how we can optimize our audit rules. Performance tips Good auditd performance will reduce stress on the Linux kernel and lower its impact. Before changing anything to your system, we suggest benchmarking your system performance before and after. This […]Read more
Starting with Linux auditing can be overwhelming. Fortunately, there is a great feature in the Linux kernel to watch events and log them for us. To give you a quick start to use the Linux Audit Framework, we have collected some basic rules for configuring the audit daemon and its rules. Main Configuration By default the configuration values in /etc/audit/audit.conf are suitable for most systems. If you know your system is very low or very high (e.g. mainframe) on resources, […]Read more
Linux audit – Log files /var/log/audit By default the Linux audit framework logs all data in the /var/log/audit directory. Usually this file is named audit.log. /var/log/audit/audit.log This is the default log file for the Linux audit daemon. The file has a capture of all related audit events. It has been configured in auditd.conf: root@server# cat /etc/audit/auditd.conf log_file = /var/log/audit/audit.log Usually there is no reason to alter this location, unless a different storage location is preferred. For safeguarding of the […]Read more
Linux Audit Framework: using aureport The Linux audit framework logs events, as specified by the configured watches. To extract particular events we can use the ausearch or aureport tools. The latter is the one we will focus on in this article, to get the most out of the tool. Aureport The aureport utility can be executed without any parameters. It will then extract all audit events available from the log. Since the audit log can be very big, it might […]Read more
Configuring and auditing Linux systems with Audit daemon The Linux Audit Daemon is a framework to allow auditing events on a Linux system. Within this article we will have a look at installation, configuration and using the framework to perform Linux system and security auditing. Auditing goals By using a powerful audit framework, the system can track many event types to monitor and audit the system. Examples include: Audit file access and modification See who changed a particular file Detect […]Read more