So I strongly suggest to look up some background of the blog and author first.As this service opens up a potential gateway into the system, it is one of the steps to hardening a Linux system.
This article covers the SSH security tips to secure the OpenSSH service and increase the defenses of the system. Table of Contents OpenSSH security What will be covered SSH basics Deployment tips Do (not) use best practices Check the status of SSH Use the SSH configuration test Making changes to a remote system Deploy in small steps Show active SSH connections Securing the SSH server configuration Preparations SSH security settings Use of X11Forwarding Disable rhosts DNS hostname checking Disable empty passwords Maximum authentication attempts Public key authentication Disable root login Set SSH protocol Usage of AllowUsers and DenyUsers Use HashKnownHosts Restrict allowable commands Additional restrictions Configure your firewall Use a jump server OpenSSH client security settings Client configuration See the default and active client settings SSH settings for a single system Tools for SSH security Lynis ssh-audit Resources Read the man page References OpenSSH security OpenSSH is under development by the security fanatics from the OpenBSD project. Every new piece of functionality is created with care, especially when it comes to security. Although there were some vulnerabilities, OpenSSH is fairly secure by default. During research for the security auditing tool Lynis, we looked also at the available OpenSSH settings. ![]() What will be covered We will be covering both the server and client configuration. The configuration syntax and settings are based on OpenSSH 7.x. The examples should be working for most Linux distributions like CentOS, Debian, Ubuntu, and RHEL. You can expect this to be also the case for FreeBSD, OpenBSD, and other systems that use OpenSSH. If you discovered an error or exception, let it know via the comments. Harden Ubuntu Desktop How To Secure SSHAfter reading this article, you will know: Where the client settings and server settings are stored How to see the active and default settings How to test your configuration settings Make an informed decision on how to secure SSH Which tools can help audit SSH and apply best practices SSH basics SSH has two parts: the server daemon (sshd) that runs on a system and the client (ssh) used to connect to the server. Typically administration is done by using an SSH client from a workstation. If you are on Windows, then often you will be using something like Putty. When it comes to the security of the SSH configuration, it is the server part that is the most interesting. For example, is that the server can decide if normal password based logins are allowed or denied. Even if the client has a preference, it is the server to make the final call. The server configuration file is located at etcsshsshdconfig. The client configuration settings can be found in etcsshsshconfig (system wide) or.sshconfig (per user). Settings can also be specified during the connection by providing a command-line option. Before we start making changes, lets start with some tips to do it right. Deployment tips Do (not) use best practices The web is full of blogs and guides that state they are using so-called best practices. Unfortunately, many of the blogs and articles are simple copies from other blogs and without the extensive research.
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