{"id":55403,"date":"2024-02-22T12:47:17","date_gmt":"2024-02-22T12:47:17","guid":{"rendered":"http:\/\/ba89414f-b54a-4bd7-be18-2151f31ba392"},"modified":"2024-02-22T12:47:17","modified_gmt":"2024-02-22T12:47:17","slug":"5-tips-for-securing-ssh-on-your-linux-server-or-desktop","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/5-tips-for-securing-ssh-on-your-linux-server-or-desktop\/","title":{"rendered":"5 tips for securing SSH on your Linux server or desktop"},"content":{"rendered":"<figure class=\"c-shortcodeImage u-clearfix c-shortcodeImage-large\">\n<div class=\"c-shortcodeImage_imageContainer\">\n<div class=\"c-shortcodeImage_image\"><picture class=\"c-cmsImage c-cmsImage_loaded\"><source media=\"(max-width: 767px)\" srcset=\"https:\/\/www.zdnet.com\/a\/img\/resize\/38c7ad5468e9b89a1613ae81a9c5356b072a759b\/2024\/02\/22\/2bb3695e-987a-40a1-a060-5fe678f01fb2\/gettyimages-575202096.jpg?auto=webp&amp;width=768\" alt=\"Gentoo Penguin in Antarctica\"><source media=\"(max-width: 1023px)\" srcset=\"https:\/\/www.zdnet.com\/a\/img\/resize\/04b1cd053fd14481dba471f805a5b37e572607a8\/2024\/02\/22\/2bb3695e-987a-40a1-a060-5fe678f01fb2\/gettyimages-575202096.jpg?auto=webp&amp;width=1024\" alt=\"Gentoo Penguin in Antarctica\"><source media=\"(max-width: 1440px)\" srcset=\"https:\/\/www.zdnet.com\/a\/img\/resize\/184dbe2e172d2e5d13af3f90d188d4b6e8a0531c\/2024\/02\/22\/2bb3695e-987a-40a1-a060-5fe678f01fb2\/gettyimages-575202096.jpg?auto=webp&amp;width=1280\" alt=\"Gentoo Penguin in Antarctica\"><img decoding=\"async\" src=\"https:\/\/www.zdnet.com\/a\/img\/resize\/184dbe2e172d2e5d13af3f90d188d4b6e8a0531c\/2024\/02\/22\/2bb3695e-987a-40a1-a060-5fe678f01fb2\/gettyimages-575202096.jpg?auto=webp&amp;width=1280\" alt=\"Gentoo Penguin in Antarctica\" width=\"1280\" height=\"924.9680903289151\" fetchpriority=\"low\"><\/picture><\/div>\n<p> <!----><\/div>\n<p> <!----><figcaption> <span class=\"c-shortcodeImage_credit g-outer-spacing-top-xsmall u-block\">David Merron Photography\/Getty Images<\/span><\/figcaption><\/figure>\n<p>I&#8217;ve been using <a href=\"https:\/\/www.zdnet.com\/article\/how-to-make-ssh-even-easier-to-use-with-config-files\/\" rel=\"follow\">Secure Shell<\/a> (SSH) for decades. With this remote login tool, I can rest assured my remote machines accept logins <a href=\"https:\/\/www.zdnet.com\/article\/cybersecurity-101-everything-on-how-to-protect-your-privacy-and-stay-safe-online\/\" rel=\"follow\">securely and efficiently<\/a>. At the same time, I also understand nothing is ever 100% secure on any device connected to a network, which is why I always take time to better secure SSH on every computer I use.<\/p>\n<p><strong>Also: <\/strong><a href=\"https:\/\/www.zdnet.com\/article\/best-vpn\/\" rel=\"follow\"><strong>The best VPN services (and how to choose the right one for you)<\/strong><\/a><\/p>\n<p>You might be surprised at how easy it is to add a few extra &#8220;layers&#8221; of security. As I highlight below, there are some easy-to-apply tips that will help <a href=\"https:\/\/www.zdnet.com\/article\/best-linux-desktops-for-beginners\/\" rel=\"follow\">your Linux desktop<\/a> and server machine to be a bit more secure, so you can trust they&#8217;re better protected against unwanted logins.<\/p>\n<p>Let&#8217;s get to work.<\/p>\n<p><!----><\/p>\n<h2>1. Install fail2ban<\/h2>\n<p>One of the first things you should do (especially on a server) is install fail2ban, which prevents malicious and brute-force login attacks and can also be used to monitor other networking protocols (such as HTTP, SSH, and FTP).&nbsp;<\/p>\n<p><strong>Also: <a href=\"https:\/\/www.zdnet.com\/article\/do-you-need-antivirus-on-linux\/\" rel=\"follow\">Do you need antivirus on Linux?<\/a><\/strong><\/p>\n<p>With fail2ban, you create jails, which are configurations that tell the system what to do when certain things happen (such as a failed SSH login attempt). Jail files (typically named&nbsp;<em>jail.local<\/em>) are housed in \/etc\/fail2ban\/ and might look something like this:<\/p>\n<div class=\"c-shortcodeCodeSnippet\" readability=\"8\">\n<pre class=\"c-shortcodeCodeSnippet_code\">[sshd]\nenabled = true\nport = ssh\nfilter = sshd\nlogpath = \/var\/log\/auth.log\nmaxretry = 3\nfindtime = 300\nbantime = 28800\nignoreip = 127.0.0.1<\/pre>\n<p> <!----><\/div>\n<p>You can install fail2ban on a <a href=\"https:\/\/www.zdnet.com\/article\/debian-linux-founder-ian-murdock-would-have-been-amazed-at-its-legacy\/\" rel=\"follow\">Debian-based system<\/a>, with the following command:<\/p>\n<div class=\"c-shortcodeCodeSnippet\" readability=\"7\">\n<pre class=\"c-shortcodeCodeSnippet_code\">sudo apt-get install fail2ban -y<\/pre>\n<p> <!----><\/div>\n<p>On a <a href=\"https:\/\/www.zdnet.com\/article\/fedora-39-beta-offers-one-of-the-best-performing-linux-distributions-ive-seen-in-a-long-time\/\" rel=\"follow\">Fedora-based system<\/a>, that command would be:<\/p>\n<div class=\"c-shortcodeCodeSnippet\" readability=\"7\">\n<pre class=\"c-shortcodeCodeSnippet_code\">sudo dnf install fail2ban -y<\/pre>\n<p> <!----><\/div>\n<h2>2. Change the default port<\/h2>\n<p>By default, SSH uses port 22 for incoming connections. This connection is common knowledge and can lead to trouble. On my more important systems, I&#8217;ll always change the port to something else, like 2124. It&#8217;s important that you change the port to something that is not being used by another system.&nbsp;<\/p>\n<p>The port configuration is set in the \/etc\/ssh\/sshd_config file and in the line&nbsp;<em>#Port 22.&nbsp;<\/em><\/p>\n<p><strong>Also:&nbsp;<a href=\"https:\/\/www.zdnet.com\/article\/beyond-passwords-4-key-security-steps-youre-probably-forgetting\/\" rel=\"follow\">4 key security steps you&#8217;re probably forgetting<\/a><\/strong><\/p>\n<p>Make sure to remove the # character and change 22 to whatever port you want to use. Once you&#8217;ve made the change, remember to restart SSH with:<\/p>\n<div class=\"c-shortcodeCodeSnippet\" readability=\"7\">\n<pre class=\"c-shortcodeCodeSnippet_code\">sudo systemctl restart ssh<\/pre>\n<p> <!----><\/div>\n<p>In the case of Fedora-based systems, that command would be:<\/p>\n<div class=\"c-shortcodeCodeSnippet\" readability=\"7\">\n<pre class=\"c-shortcodeCodeSnippet_code\">sudo systemctl restart sshd<\/pre>\n<p> <!----><\/div>\n<h2>3. Block users with blank passwords<\/h2>\n<p>Although you probably don&#8217;t have users on your system with <a href=\"https:\/\/www.zdnet.com\/article\/best-password-manager\/\" rel=\"follow\">blank passwords<\/a>, this tip falls under the category of &#8220;better safe than sorry&#8221;. If you have a user with a blank password, and a bad actor discovers it, they could access your machine with ease. To prevent that situation, open the \/etc\/ssh\/sshd_config file and look for the line:<\/p>\n<div class=\"c-shortcodeCodeSnippet\">\n<pre class=\"c-shortcodeCodeSnippet_code\">#PermitEmptyPasswords no<\/pre>\n<p> <!----><\/div>\n<p>Change that line to:<\/p>\n<div class=\"c-shortcodeCodeSnippet\">\n<pre class=\"c-shortcodeCodeSnippet_code\">PermitEmptyPasswords no<\/pre>\n<p> <!----><\/div>\n<p>Save and close the file and then restart SSH.<\/p>\n<h2>4. Restrict logins to specific IP addresses<\/h2>\n<p>Another very handy trick is to limit SSH access to specific IP addresses. For example, if you have only one person who needs to access a machine, and their IP address is 192.168.1.11, you could limit SSH access with the help of the&nbsp;<em>\/etc\/hosts.allow<\/em>&nbsp;file. Open that file with your favorite text editor, such as nano, and add the following line at the bottom:<\/p>\n<div class=\"c-shortcodeCodeSnippet\" readability=\"8\">\n<pre class=\"c-shortcodeCodeSnippet_code\">sshd: 192.168.1.62, 192.168.1.11<\/pre>\n<p> <!----><\/div>\n<p>If you have more than one IP address you want to allow in, you can add as many as necessary, separating each address with a comma, like so:<\/p>\n<div class=\"c-shortcodeCodeSnippet\" readability=\"11\">\n<pre class=\"c-shortcodeCodeSnippet_code\">sshd: 192.168.1.62, 192.168.1.11, 192.168.1.12, 192.168.1.13, 192.168.1.14<\/pre>\n<p> <!----><\/div>\n<p>Save and close the file.<\/p>\n<h2>5. Use SSH key authentication<\/h2>\n<p>The importance of SSH key authentication cannot be overstated. I&#8217;ve already shown in another article how this technique&nbsp;<a href=\"https:\/\/www.zdnet.com\/article\/how-to-set-up-ssh-key-authentication-in-linux-for-more-secure-logins\/\" rel=\"follow\">is set up<\/a>, so make sure to read through that piece and implement the tactic. In conjunction with fail2ban, SSH key authentication is a great way to prevent unwanted SSH logins.<\/p>\n<p>And there you have it &#8212; five easy ways of securing SSH on both your Linux desktops and servers. Just because SSH has the word&nbsp;<em>secure<\/em>&nbsp;in it, doesn&#8217;t mean it should be viewed as a means to a secure end. With a bit of extra configuration, your SSH logins will be better protected from the bad actors who roam the internet looking for access to systems.<\/p>\n<p>READ MORE <a href=\"https:\/\/www.zdnet.com\/article\/5-tips-for-securing-ssh-on-your-linux-server-or-desktop\/#ftag=RSSbaffb68\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Secure Shell is one of the most secure options for logging into a Linux system remotely. But there are ways to make the technology even more secure.<br \/>\nREAD MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[62],"tags":[],"class_list":["post-55403","post","type-post","status-publish","format-standard","hentry","category-zdnet-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>5 tips for securing SSH on your Linux server or desktop 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | ThreatsHub.org | Cloud Security &amp; Cyber Threats Analysis Hub. 100% Free OSINT Threat Intelligent and Cybersecurity News.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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