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One of the things that has changed from Backtrack is that it is no longer necessary to generate ssh keys, this is a bit scary for us paranoid security folks as can be seen in this great blog post. In short, having known ssh key pairs available for the whole planet means anybody could MiTM your ssh connections to Kali by default, not cool.

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• Aug 02, 2017  In this Linux/Mac terminal tutorial, we will be learning how to configure ssh keys so that we can login to our servers without a password.
• Installation of SSH Keys on Linux - A Step-By-Step Guide. Outlined below is a step-by-step guide detailing the process of installing SSH Keys on a Linux server: Step One: Creation of the RSA Key Pair. The first step in the installation process is to create the key pair on the client machine, which would, more often than not, be your own system.
• We dont want the same keys as the next man do we (MITM). Move the default Kali ssh keys to a new folder: This will move your default keys to the new folder. Regenerate the keys: Creating SSH2 RSA key; this may take some time. Creating SSH2 DSA key; this may take some time.
• Jul 29, 2019  Learn how to set up a secure connection to a remote host by generating SSH Keys on Ubuntu 18.04. An SSH Key is a secure method of logging into your server!
• Dec 07, 2019  SSH works using a key pair; the public key and the private key. The private key is kept on the computer you log in from, while the public key is stored in the.ssh/authorizedkeys file on all the computers you want to log into. The public key stored on the server you wish to unlock and by matching the private pair, you are able to unlock the system.
• The next section shows a full example of what each key file should look like. The Generated Key Files. The generated files are base64-encoded encryption keys in plain text format. If you select a password for your private key, its file will be encrypted with your password. Be sure to remember this password or the key pair becomes useless.

To setup SSH keys between two servers we need to follow these steps:

Create a key pair on the source server. When we give ssh-keygen command, it will by default create a 2048 -bit RSA Key pair and if you need more stronger encryption you can use 4096 bit as well. For that you need to use “-b 4096” in the ssh-keygen command end. I am using default one here.

Couple of things to be taken care in the below output:

In line “Enter file in which to save the key (/root/.ssh/id_rsa):”

It is asking the path to save the key and default one is normally fine. If default is fine, you can simply press enter. If you want to try alternate path, then you need to specify the same there. Some times this will says like:

You should take a copy of the .ssh folder before making any changes or should know what you are doing. Sending a Yes will make old key (if in use already ) not to work.

In the line “Enter passphrase (empty for no passphrase):” This is an additional security procedure which will ask passphrase each time when you try to login to SSH and that will work as a 2 step verification. But if you need ssh access for any scripting or any other direct works and speedy works, then better to not to have this. Other than scripting or automating the works, we will suggest you to have this for sure.

Github ssh key linux. Full result of the command for reference:

Step 2 : Copy this created Key Pair to your Destination Server

There are 2 different ways to get this copied to your destination server

• Using the ssh-copy-id command
• Copying the ssh key using normal ssh user/pass as one liner from our local machine or after logging in the server.

2.1 Using the ssh-copy-id command

ssh-copy-id will handle the copy and setup of the key to a remote server in the proper way for you. Once the command is completed you will not need a password for each login. Now you can write all your automated scripts for system admin work without having to enter a password manually and save time on day to day access of systems you use all the time.

First you need to check if there is a command like this and if the command is working and user as which you are trying is having access to this command, then you can use this command to copy the public key to the remote server. This Utility will scan your local account for any rsa public key and will prompt you for the password of the remote user’s account.

Here we are going to copy the root ssh key to the servers root level access. So to get this copied, you need to login / switch to the user for which you have created the key. In this case we are trying root-root connection.

Full output is below and I am adding needed details in between them

If you are using this for the first time, you will get such a response and you need to type yes and then press enter

Enter the password and then press enter.

Now try logging into the machine, with: “ssh -p ‘1986’ ‘root@192.1.1.19′”
and check to make sure that it is working as expected.

After this you will be able to login to server without any passwords. Once password less auth is working fine, you can disable the password authentication so that you can lock ssh access to just using ssh keys

2.2 Copying the ssh key using normal ssh user/pass manually

If some how you are not able to get that above command working, I will add the steps so that you can copy the ssh key and setup password less auth from your machine to your server.

To do this we have to manually append the content of your id_rsa.pub file to the /root/.ssh/authorized_keys file on your Destination machine. If you are going to copy the key to root user the location will be /root/.ssh/authorized_keys .

From the Step 1 : you may have seen the below line

Your public key has been saved in /root/.ssh/id_rsa.pub.

This says the public key which you need to copy to the remote server is located in the above file. So you need to copy the content of this file and then copy or paste them in the authorized_keys of the remote server

So do the below steps

Below command will give you the key to be copied:

Login to Remote server to which you need to copy this above key and make sure you use the same user to which you need to copy the ssh key. If you need direct root access, copy the key directly to /root/.ssh/ section

Create a folder .ssh if it does not exist

To check if that exists and if not create it using the below commands:

If the folder is not there , then create it with the below command:

Make sure the permission of the folder is correct one

After this please try login to server from a new terminal and make sure keyless auth is working as expected. Only then disable password authentication in the ssh config.

NOTE: Make double sure you are able to login to server as needed by you (either directly from your machine, or you can login to another user in the remote server and switch to root from that account manually using su or sudo ) and then only disable password auth else there is chances to get root users locked.

If you have any needs you can always contact me for any help and share your comments.

Introduction

Establishing an SSH (Secure Shell) connection is essential to log in and effectively manage a remote server. Encrypted keys are a set of access credentials used to establish a secure connection.

This guide will walk you how to generate SSH keys on Ubuntu 18.04. We will also cover setting up SSH key-based authentication to connect to a remote server without requiring a password.

• A server running Ubuntu 18.04
• A user account with sudo privileges
• Access to a terminal window / command line (Ctrl-Alt-T)

If you are already running an Ubuntu 18.04 server, you can skip this step. If you are configuring your server for the first time, you may not have SSH installed.

1. Start by installing the tasksel package:

The system will first ask for confirmation before proceeding:

2. Next, use tasksel to install the ssh-server:

3. Load the SSH server service, and set it to launch at boot:

On your client system – the one you’re using to connect to the server – you need to create a pair of key codes.

To generate a pair of SSH key codes, enter the commands:

This will create a hidden directory to store your SSH keys, and modify the permissions for that directory. The ssh-keygen command creates a 2048-bit RSA key pair.

For extra security, use RSA4096:

If you’ve already generated a key pair, this will prompt to overwrite them, and those old keys will not work anymore.

The system will ask you to create a passphrase as an added layer of security. Input a memorable passphrase, and press Enter.

This process creates two keys. One is a public key, which you can hand out to anyone – in this case, you’ll save it to the server. The other one is a private key, which you will need to keep secure. The secure private key ensures that you are the only person who can encrypt the data that is decrypted by the public key.

Step 2- Copy Public Key to the Ubuntu Server

First, get the IP address of the Ubuntu server you want to connect to.

In a terminal window, enter:

The system’s IP address is listed in the second entry:

On the client system, use the ssh-copy-id command to copy the identity information to the Ubuntu server:

Replace server_IP with the actual IP address of your server.

If this is the first time you’re connecting to the server, you may see a message that the authenticity of the host cannot be established:

Type yes and press Enter.

The system will check your client system for the id_rsa.pub key that was previously generated. Then it will prompt you to enter the password for the server user account. Type it in (the system won’t display the password), and press Enter.

The system will copy the contents of the ~/.ssh/id_rsa.pub from the client system into the ~/.ssh/authorized_keys directory of the server system.

The system should display:

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If your system does not have the ssh-copy-id command, you can copy the key manually over the SSH.

Use the following command:

To log in to a remote server, input the command:

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The system should not ask for a password as it is negotiating a secure connection using the SSH keys. If you used a security passphrase, you would be prompted to enter it. After you do so, you are logged in.

If this is the first time you’ve logged into the server, you may see a message similar to the one in part two. It will ask if you are sure you want to connect – type yes and press Enter.

Step 4- Disable Password Authentication

This step creates an added layer of security. If you’re the only person logging into the server, you can disable the password. The server will only accept a login with your private key to match the stored public key.

Edit the sshd_config file:

Search the file and find the PasswordAuthentication option.

Edit the file and change the value to no:

Save the file and exit, then restart the SSH service:

Verify that SSH is still working, before ending the session:

If everything works, you can close out and resume work normally.

By following the instructions in this tutorial, you have setup SSH-key-based authentication on an Ubuntu 18.04 server.

The connection is now highly secure as it uses a set of unique, encrypted SSH keys.

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