{"id":5617,"date":"2017-01-03T12:23:48","date_gmt":"2017-01-03T12:23:48","guid":{"rendered":"https:\/\/cpanelplesk.com\/wp62\/?p=5617"},"modified":"2021-02-02T04:49:29","modified_gmt":"2021-02-02T04:49:29","slug":"ssh-key-generation-passwordless-ssh-login-linux","status":"publish","type":"post","link":"https:\/\/cpanelplesk.com\/wp62\/ssh-key-generation-passwordless-ssh-login-linux\/","title":{"rendered":"SSH key generation for Passwordless SSH login in Linux"},"content":{"rendered":"<p><span style=\"color: #000000;\">Secure Shell, is a cryptographic network protocol that we can use to access the remote machines without passwords securely.To do this we need to generate the SSH key. <!--more-->Using <a href=\"https:\/\/cpanelplesk.com\/wp62\/start-stop-restart-enable-reload-openssh-server-linux\/\">SSH<\/a>, we can access the remote system\u2019s command-prompt and run commands without access them physically. Also, we can transfer files between remote and local systems securely using Secure Copy <a href=\"https:\/\/cpanelplesk.com\/wp62\/scp-with-port-number\/\">(SCP) protocol.<\/a><\/span><\/p>\n<p><span style=\"color: #000000;\">This tutorial explains how to configure Passwordless SSH login in Linux. We can do this in two ways.<\/span><\/p>\n<h3><span style=\"color: #000000;\">Why password-less SSH login<\/span><\/h3>\n<p><span style=\"color: #000000;\">To increase security and to reduce the chances of being hacked. Passwords can be easily guessed or cracked by hackers, or you might forget if it\u2019s a long and complex password, or if you don\u2019t want to save the passwords in an unsecured place.<\/span><\/p>\n<p><span style=\"color: #000000;\">In password-less SSH login method, we can exchange encrypted keys instead of entering the actual password while connecting to the remote systems via SSH. So that way, nobody can easily hack or guess our passwords, because we are no more using passwords to access the remote systems.<\/span><\/p>\n<p><span style=\"color: #000000;\">More importantly invisible key-loggers and brute-force strikes doesn\u2019t work for the spying sight if we use Password-less SSH login attempts.<\/span><\/p>\n<h3><span style=\"color: #000000;\">Method 1:<\/span><\/h3>\n<ol>\n<li><span style=\"color: #000000;\">Here, we\u2019ll be using two systems.<\/span><\/li>\n<li><span style=\"color: #000000;\">Local system\u2019s IP address: 192.168.17.133<\/span><\/li>\n<li><span style=\"color: #000000;\">Local system\u2019s OS: <a href=\"https:\/\/cpanelplesk.com\/wp62\/basic-centos-configurations-building-working-server\/\">CentOS<\/a> 7 LTS<\/span><\/li>\n<li><span style=\"color: #000000;\">Remote system\u2019s IP address: 119.153.131.120<\/span><\/li>\n<li><span style=\"color: #000000;\">Remote system\u2019s OS: <a href=\"https:\/\/cpanelplesk.com\/wp62\/install-upgrade-mariadb-10-1-12-centos-rhel-fedora\/\">CentOS 7<\/a><\/span><\/li>\n<\/ol>\n<p><span style=\"color: #000000;\">First of all, open Terminal and run the following command to generate pair of private and public keys in your local system.<\/span><\/p>\n<p><span style=\"color: #000000;\">Run the following command to generate encrypted keys.<\/span><\/p>\n<div class=\"space1\"><\/div>\n<div class=\"command-sh\">\n<pre>ssh-keygen -t rsa<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<h3>Output:<\/h3>\n<div class=\"space1\"><\/div>\n<div class=\"output-sh\">\n<pre>Generating public\/private rsa key pair.\r\nEnter file in which to save the key (\/root\/.ssh\/id_rsa): \r\n[Just, Press Enter Key]\r\nEnter passphrase (empty for no passphrase): [Just, Press Enter Key]\r\nEnter same passphrase again: [Just, Press Enter Key]\r\nYour identification has been saved in \/root\/.ssh\/id_rsa.\r\nYour public key has been saved in \/root\/.ssh\/id_rsa.pub.\r\nThe key fingerprint is:\r\n53:b7:3a:5b:39:22:78:35:e7:cf:44:64:cd:52:d4:a1 root@root\r\nThe key's randomart image is:\r\n+--[ RSA 2048]----+\r\n| o=|\r\n| .+.|\r\n| . .E+ o|\r\n| . . + . |\r\n| S o o . |\r\n| . o = o |\r\n| . o + = . |\r\n| . . = = |\r\n| . o |\r\n+-----------------+<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<p><span style=\"color: #000000;\">The private\/public key has been generated and stored at \u201c\/root\/.ssh\/\u201d.<\/span><\/p>\n<p><span style=\"color: #000000;\">The above command will generate two keys. One is private, and another is public key. The private key should remain in the local system itself. The public key should be transferred to the remote systems that you want to access from the local system. If the both keys does coordinate with each other while authenticating, the local system will be able to access the remote system. If both private and public key pairs doesn\u2019t match, the verification will not be permitted.<\/span><\/p>\n<p><span style=\"color: #000000;\">Also, it is important to know that, you can\u2019t use the same pair of keys for different systems. Each system\u2019s keys are different and exclusive.<\/span><\/p>\n<p><span style=\"color: #000000;\">Now, copy the public key file to your remote system.<\/span><\/p>\n<div class=\"space1\"><\/div>\n<div class=\"command-sh\">\n<pre>ssh-copy-id -i ~\/.ssh\/id_rsa.pub root@119.153.131.120<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<h3>Output:<\/h3>\n<div class=\"space1\"><\/div>\n<div class=\"output-sh\">\n<pre>\/usr\/bin\/ssh-copy-id: INFO: attempting to log in with the new key(s), \r\nto filter out any that are already installed\r\n\/usr\/bin\/ssh-copy-id: INFO: 1 key(s) remain to be installed -- \r\nif you are prompted now it is to install the new keys\r\nroot@119.153.131.120's password:\r\nNumber of key(s) added: 1\r\n\r\nNow try logging into the machine, with: \"ssh 'root@119.153.131.120'\"\r\nand check to make sure that only the key(s) you wanted were added.<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<p><span style=\"color: #000000;\">Now, ssh to your remote server as shown below.<\/span><\/p>\n<h3><span style=\"color: #000000;\">Syntax:<\/span><\/h3>\n<div class=\"space1\"><\/div>\n<div class=\"command-sh\">\n<pre>ssh username@ip-address-of-remote-system\r\nssh root@119.153.131.120<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<p><span style=\"color: #000000;\">You will be able to access the remote system without entering the password.<\/span><\/p>\n<h3><span style=\"color: #000000;\">Method 2:<\/span><\/h3>\n<p><span style=\"color: #000000;\">This method is much easier than the first method, but it&#8217;s not that safe as compared to first one. In this method, we will not store the password or exchange the keys between local and remote systems. Instead, we will use the \u201cpassword\u201d as part of the command.<\/span><\/p>\n<p><span style=\"color: #000000;\">We\u2019ll use \u201csshpass\u201d command to enable non-interactive SSH password authentication.<\/span><\/p>\n<p><span style=\"color: #000000;\">To install sshpass in Ubuntu systems, run:<\/span><\/p>\n<div class=\"space1\"><\/div>\n<div class=\"command-sh\">\n<pre>sudo apt-get install sshpass<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<p><span style=\"color: #000000;\">In RPM based systems, like CentOS, run:<\/span><\/p>\n<div class=\"space1\"><\/div>\n<div class=\"command-sh\">\n<pre>yum install sshpass<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<p><span style=\"color: #000000;\">Now, lets connect to the remote system using \u2018sshpass\u2019 command:<\/span><\/p>\n<div class=\"space1\"><\/div>\n<div class=\"command-sh\">\n<pre>sshpass -p 'P@ssw0rd' ssh root@119.153.131.120<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<p><span style=\"color: #000000;\">Now, you can access the remote system.<\/span><\/p>\n<p><span style=\"color: #000000;\">you can also export the password to Environment variable and ssh to your system without using the password as part of your command.<\/span><\/p>\n<p><span style=\"color: #000000;\">To do that, first export password to the environment variable.<\/span><\/p>\n<div class=\"space1\"><\/div>\n<div class=\"command-sh\">\n<pre>export SSHPASS=P@ssw0rd<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<p><span style=\"color: #000000;\">Now, ssh to your remote system using below command:<\/span><\/p>\n<div class=\"space1\"><\/div>\n<div class=\"command-sh\">\n<pre>sshpass -e ssh root@119.153.131.120<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<p><span style=\"color: #000000;\">That&#8217;s it.<\/span><\/p>\n<p><span style=\"color: #000000;\">Error&#8217;s troubleshooting:<\/span><\/p>\n<p><span style=\"color: #000000;\">You might face some issue after configuring Passwordless SSH login in Linux, I have explain some of them as below.<\/span><\/p>\n<h3><span style=\"color: #000000;\">Problem-1<\/span><\/h3>\n<p><span style=\"color: #000000;\">In case, \u2018ssh\u2019 version is different in local and remote systems, you need to set permissions for \u2018.ssh\u2019 directory of your remote system.<\/span><\/p>\n<p><span style=\"color: #000000;\">Run the following command, to do that<\/span>:<\/p>\n<div class=\"space1\"><\/div>\n<div class=\"command-sh\">\n<pre>ssh root@119.153.131.120 \"chmod 700 .ssh; chmod 640 .ssh\/authorized_keys\"<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<p><span style=\"color: #000000;\">Now, you can ssh to your remote systems without any issues.<\/span><\/p>\n<h3><span style=\"color: #000000;\">Problem-2<\/span><\/h3>\n<p><span style=\"color: #000000;\">If you still can\u2019t ssh to remote systems for some reasons, go to your remote system, and enable <a href=\"https:\/\/cpanelplesk.com\/wp62\/permission-denied-ssh-keys-publickeygssapi-keyexgssapi-with-mic\/\">SSH key<\/a> authentication.<\/span><\/p>\n<p><span style=\"color: #000000;\">Edit the following file:<\/span><\/p>\n<div class=\"space1\"><\/div>\n<div class=\"command-sh\">\n<pre>nano \/etc\/ssh\/sshd_config<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<p><span style=\"color: #000000;\">Find, uncomment and change the following lines as given below.<\/span><\/p>\n<div class=\"space1\"><\/div>\n<div class=\"command-sh\">\n<pre>PubkeyAuthentication yes\r\nAuthorizedKeyFile .ssh\/authorized_keys\r\nChallengeResponseAuthentication no<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<p><span style=\"color: #000000;\">Save and close the file. Restart ssh service using command:<\/span><\/p>\n<div class=\"space1\"><\/div>\n<div class=\"command-sh\">\n<pre>systemctl restart sshd<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<p><span style=\"color: #000000;\">Now, Go back to the local system and try again to login to the remote machine, with the below command:<\/span><\/p>\n<div class=\"space1\"><\/div>\n<div class=\"command-sh\">\n<pre>ssh username@ip-address-of-remote-system<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<h3><span style=\"color: #000000;\">Problem-3\u00a0<\/span><\/h3>\n<p><span style=\"color: #000000;\">Sometimes you might facing the following error while ssh to the remote systems.<\/span><\/p>\n<p><span style=\"color: #000000;\">Agent admitted failure to sign using the key.<\/span><\/p>\n<p><span style=\"color: #000000;\">To resolve it, run the following command in your local system.<\/span><\/p>\n<div class=\"space1\"><\/div>\n<div class=\"command-sh\">\n<pre>ssh-add<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<p><span style=\"color: #000000;\">Enter the correct passphrase that you have created earlier.<\/span><\/p>\n<div class=\"space1\"><\/div>\n<div class=\"command-sh\">\n<pre>Enter passphrase for \/root\/.ssh\/id_rsa:\r\nIdentity added: .ssh\/id_rsa (.ssh\/id_rsa)\r\nssh-add command will add private key identities to the authentication \r\nagent.<\/pre>\n<\/div>\n<div class=\"space1\"><\/div>\n<p><span style=\"color: #000000;\">That\u2019s all, Both methods are easy to configure and use. Go ahead and give it a try.<\/span><\/p>\n<p><span style=\"color: #000000;\">You also like to know<\/span>\u00a0<a href=\"https:\/\/cpanelplesk.com\/wp62\/change-direct-admins-default-port-number\/\">How To Change Direct Admin\u2019s Default Port Number<\/a>.\u00a0<span style=\"color: #000000;\">Please check my previous article on this and also give your opinion below if you experience any issues or to discuss your ideas and experiences.<\/span><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Secure Shell, is a cryptographic network protocol that we can use to access the remote machines without passwords securely.To do this we need to generate the SSH key. [&#8230;]<\/p>\n<p><a class=\"understrap-read-more-link\" href=\"https:\/\/cpanelplesk.com\/wp62\/ssh-key-generation-passwordless-ssh-login-linux\/\">Continue Reading&#8230;<\/a><\/p>\n","protected":false},"author":2,"featured_media":5619,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,14],"tags":[],"class_list":["post-5617","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cpanel","category-linux"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>SSH key generation for Passwordless SSH login in Linux - cPanel Plesk<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cpanelplesk.com\/wp62\/ssh-key-generation-passwordless-ssh-login-linux\/\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"SSH key generation for Passwordless SSH login in Linux - cPanel Plesk\" \/>\n<meta name=\"twitter:description\" content=\"Secure Shell, is a cryptographic network protocol that we can use to access the remote machines without passwords securely.To do this we need to generate the SSH key. 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