![]() Now we restart the SSH service so our new configuration take place. SSH has two versions that may use, SSH v1 is older and less secure than protocol SSHv2 2, it’s recommended to be disabled unless you specifically need it. Uncomment these lines and change them refer to the line below: PasswordAuthentication no PubkeyAuthentication yes systemctl restart rvice Disable SSH Protocol 1 After all, it’s recommended to disable the Password authentication as well.You may use “cat” command on the client side to view the file and use an editor like “nano” on the server side to modify or create the authorized_keys file.Copy the contents of ~/.ssh/id_rsa.pub from client system into the file ~/.ssh/authorized_keys on the Server.The public key is written to ~/.ssh/id_rsa.pub The private key is written to ~/.ssh/id_rsa.Accept the default file location of /.ssh/id_rsa.– To generate an RSA key pair ssh-keygen -t rsa ~/.ssh/authorized_keys If you are using Linux Finally, you should copy the Public key file in your server in this path: ~/.ssh/authorized_keys.In “private key file for authentication” browse your Private key.Then open your Putty, expand the SSH category and click on “Auth”.(Optional): it’s also recommended to set a passphrase for your key.ĬAUTION: be careful with choosing the path you saving the keys, if you lose them and username/password logins are disabled on your server, you might lose your access to your server.A private and public key pair has now been generated.Move your mouse pointer around in the blank area of the Key section, below the progress bar (to generate some randomness) until the progress bar is full.After selecting your settings click on Generate to start Process.In the Number of bits in a generated key field is refer to how complicated you want your key to be, you can change the value between 2048 to 4096 for make more complicated key.For Type of key to generate, select SSH-2 RSA.You have to download the Putty key generator (a.k.a Puttygen) #CENTOS 7 DISABLE SSH SHELL BUT NOT SU CRACKED#If your Server is accessible over the Internet, you can use public key authentication instead of passwords, because SSH key authentication with password phrase is way more secure than password-only authentication, while a password can eventually be cracked with a Brute-force attack or keyloggers.ĭepending on your client OS you should follow the instructions to create a pair of authentication keys. Then change the Highlighted line from “PermitRootLogin yes” to “PermitRootLogin no”Ĭrtl+O Crtl+X systemctl restart rvice Create a key-based Authentication SSH connection (we are using nano) nano /etc/ssh/sshd_config Then open the ssh configuration file with your editor. It would be more secure to brute force attacks or in case your password is stolen.įirst, you need to create a non-root user with the following instructions: adduser username passwd username You’ll be adding a layer of security to your SSH server if you disable root user logins. #CENTOS 7 DISABLE SSH SHELL BUT NOT SU INSTALL#yum install policycoreutils-pythonĪnd then run the semanage command again to allow the new portĪfter that you need to allow the new port through the firewall with the command below: firewall-cmd -permanent -zone=public -add-port=2202/tcp firewall-cmd -reload systemctl restart rvice Disable root logins If you run the command above and get an error that semanage command not found, run the commands below to install it. semanage port -a -t ssh_port_t -p tcp 2202 What you need to do is enable the newly created port through Firewall to do that follow the instructions below. 2022) And press Ctrl +O and Ctrl +X in order to save and exit. Then change the port number from 22 to your preferable port (e.g. Then you need to edit the line that refers to the port number, for that you have to follow the instruction below. We are using nano editor in this tutorial, you may use your own editor if you wish. To change the Standard listening Port, you have to change the SSH Server configurations with the command below. We are going to provide 4 simple tips to get a more secure SSH protocol on your CentOS server. We are assuming that you have root permission, otherwise, you may start commands with “sudo”. SSH (Secure Shell) is an encrypted protocol that is way more secure than Plain text based protocols like Telnet, however, it’s could be vulnerable if not configured properly. ![]()
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