This gives direct access to run commands in another user’s environment. The whoami command prints the effective username of the current user logged into the system. Hostname gets or configures the identifying name of your system on the network. The second command helps you change the local hostname to UbuntuServer.

Linux hardening guide

You can check out whether SELinux is enabled in your system or not by using the below command. Furthermore, you should also make sure that all users update their passwords frequently. Password policies significantly reduce the risk of brute force attacks by preventing users from reusing the same passwords for multiple services. Additionally, forcing users to have to use the sudo command to make major system changes causes them to think twice before acting, verifying the necessity of every system-level change. If you’re not using a IPv6 protocol, then you should disable it because most of the applications or policies not required IPv6 protocol and currently it doesn’t required on the server. Go to network configuration file and add followings lines to disable it.

Key Tips For Using Linux Commands

The TLS protocol encrypts the message transmission for secure transfer of logs over the network. You can use an Ansible playbook with the logging System Role to configure logging on RHEL clients and transfer logs to a remote logging system using TLS encryption. With the logging System Role, you can combine the inputs and outputs to fit your scenario. To expand the functionality of the Rsyslog application, you can use specific modules.

Linux hardening guide

These lists exist to give a false sense of security and aren’t based on authority standards. DreamHost’s experts can help you get the most out of the Linux platform. Our servers are meticulously configured for security, performance, and reliability.

Use Strong Passwords

They filter out common entries that are expected in your logs and only draw your attention to unusual entries. Over time, these logs will beef up in size and may even cause a significant shortage in disk space. The logrotate package is extremely useful in this case since it can rotate, compress, and mail system logs. Although you may question its role when it comes to Linux hardening, it offers unquestionable benefits. Replace the path argument with directories that may contain such files.

The header is stored in a detached location, which also serves as an additional layer of security. This mode stores individual checksums of the sectors in the re-encryption area, which the recovery process can detect for the sectors that were re-encrypted by LUKS2. AIDE is a utility that creates a database of files and directories on the system. This database serves for checking file integrity and detect intrusion detection. The registrar is the Keylime component that contains a database of all agents, and it hosts the public keys of the TPM vendors. After the registrar’s HTTPS service accepts trusted platform module (TPM) public keys, it presents an interface to obtain these public keys for checking quotes.

2. Using SSH keys stored on a smart card

If you are hardening your Linux security, implementing disk quotas is mandatory for your server. The sysctl command allows admins to configure these kernel parameters. You may also modify the /etc/sysctl.conf file for kernel tweaking and increased security. Another linux hardening and security lessons common Linux hardening method is to enable password expiration for all user accounts. You can easily set expiration dates for user passwords by utilizing the chage command in Linux. Your system will ask users to set a new password once their existing once expire.

Linux hardening guide

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