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Nov 10, 2011 How to Generate A Public/Private SSH Key Linux By Damien – Posted on Nov 10, 2011 Nov 18, 2011 in Linux If you are using SSH frequently to connect to a remote host, one of the way to secure the connection is to use a public/private SSH key so no password is transmitted over the network and it can prevent against brute force attack. The.pub file is your public key, and the other file is the corresponding private key. If you don’t have these files (or you don’t even have a.ssh directory), you can create them by running a program called ssh-keygen, which is provided with the SSH package on Linux/macOS systems and comes with Git for Windows. May 27, 2010 Linux / UNIX: Generate SSH Keys; Install / Append SSH Key In A Remote Linux / UNIX Servers Authorizedkeys; Linux / Unix ssh-keygen: Create A Host Key File; OpenSSH Change a Passphrase With ssh-keygen command; How To Set up SSH Keys on a Linux / Unix System; How to fix: MacOS keep asking passphrase for ssh key after upgrade or reboots.
- Nov 10, 2011 How to Generate A Public/Private SSH Key Linux By Damien – Posted on Nov 10, 2011 Nov 18, 2011 in Linux If you are using SSH frequently to connect to a remote host, one of the way to secure the connection is to use a public/private SSH key so no password is transmitted over the network and it can prevent against brute force attack.
- Apr 02, 2019 The above command kicks off the SSH Key installation process for users. The -o option instructs ssh-keygen to store the private key in the new OpenSSH format instead of the old (and more compatible PEM format). It is highly recommended to use the -o option as the new OpenSSH format has an increased resistance to brute-force password cracking.
After you've checked for existing SSH keys, you can generate a new SSH key to use for authentication, then add it to the ssh-agent.
If you don't already have an SSH key, you must generate a new SSH key. If you're unsure whether you already have an SSH key, check for existing keys.
If you don't want to reenter your passphrase every time you use your SSH key, you can add your key to the SSH agent, which manages your SSH keys and remembers your passphrase.
Generating a new SSH key
- Open TerminalTerminalGit Bashthe terminal.
- Paste the text below, substituting in your GitHub Enterprise email address.This creates a new ssh key, using the provided email as a label.
- When you're prompted to 'Enter a file in which to save the key,' press Enter. This accepts the default file location.
- At the prompt, type a secure passphrase. For more information, see 'Working with SSH key passphrases'.
Adding your SSH key to the ssh-agent
Before adding a new SSH key to the ssh-agent to manage your keys, you should have checked for existing SSH keys and generated a new SSH key. When adding your SSH key to the agent, use the default macOS
ssh-add
command, and not an application installed by macports, homebrew, or some other external source.- Start the ssh-agent in the background.
- If you're using macOS Sierra 10.12.2 or later, you will need to modify your
~/.ssh/config
file to automatically load keys into the ssh-agent and store passphrases in your keychain. - Add your SSH private key to the ssh-agent and store your passphrase in the keychain. If you created your key with a different name, or if you are adding an existing key that has a different name, replace id_rsa in the command with the name of your private key file.Note: The
-K
option is Apple's standard version ofssh-add
, which stores the passphrase in your keychain for you when you add an ssh key to the ssh-agent.If you don't have Apple's standard version installed, you may receive an error. For more information on resolving this error, see 'Error: ssh-add: illegal option -- K.' - Add the SSH key to your GitHub account.
If you have GitHub Desktop installed, you can use it to clone repositories and not deal with SSH keys. It also comes with the Git Bash tool, which is the preferred way of running
git
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- Ensure the ssh-agent is running:
- If you are using the Git Shell that's installed with GitHub Desktop, the ssh-agent should be running.
- If you are using another terminal prompt, such as Git for Windows, you can use the 'Auto-launching the ssh-agent' instructions in 'Working with SSH key passphrases', or start it manually:
- Add your SSH private key to the ssh-agent. If you created your key with a different name, or if you are adding an existing key that has a different name, replace id_rsa in the command with the name of your private key file.
- Add the SSH key to your GitHub account.
- Start the ssh-agent in the background.
- Add your SSH private key to the ssh-agent. If you created your key with a different name, or if you are adding an existing key that has a different name, replace id_rsa in the command with the name of your private key file.
- Add the SSH key to your GitHub account.
- Start the ssh-agent in the background.
- Add your SSH private key to the ssh-agent. If you created your key with a different name, or if you are adding an existing key that has a different name, replace id_rsa in the command with the name of your private key file.
- Add the SSH key to your GitHub account.
Further reading
- 'About SSH'
- 'Working with SSH key passphrases'
This page explains a public key and shows you how to set up SSH keys on a Linux or Unix-like server. I am assuming that you are using Linux or Unix-like server and client with the following software:
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- OpenSSH SSHD server
- OpenSSH ssh client and friends on Linux (Ubuntu, Debian, {Free,Open,Net}BSD, RHEL, CentOS, MacOS/OSX, AIX, HP-UX and co).
What is a public key authentication?
OpenSSH server supports various authentication schema. The two most popular are as follows:
- Passwords based authentication
- Public key based authentication. It is an alternative security method to using passwords. This method is recommended on a VPS, cloud, dedicated or even home based server.
How to set up SSH keys
Steps to setup secure ssh keys:
- Create the ssh key pair using ssh-keygen command.
- Copy and install the public ssh key using ssh-copy-id command on a Linux or Unix server.
- Add yourself to sudo or wheel group admin account.
- Disable the password login for root account.
- Test your password less ssh keys login using ssh user@server-name command.
Let us see all steps in details.
How do I set up public key authentication?
You must generate both a public and a private key pair. For example:
Where,
Where,
- server1.cyberciti.biz – You store your public key on the remote hosts and you have an accounts on this Linux/Unix based server.
- client1.cyberciti.biz – Your private key stays on the desktop/laptop/ computer (or local server) you use to connect to server1.cyberciti.biz server. Do not share or give your private file to anyone.
In public key based method you can log into remote hosts and server, and transfer files to them, without using your account passwords. Feel free to replace server1.cyberciti.biz and client1.cyberciti.biz names with your actual setup. Enough talk, let’s set up public key authentication. Open the Terminal and type following commands if .ssh directory does not exists:
1: Create the key pair
On the computer (such as client1.cyberciti.biz), generate a key pair for the protocol.
Sample outputs:
You need to set the Key Pair location and name. I recommend you use the default location if you do not yet have another key there, for example: $HOME/.ssh/id_rsa. You will be prompted to supply a passphrase (password) for your private key. I suggest that you setup a passphrase when prompted. You should see two new files in $HOME/.ssh/ directory:
- $HOME/.ssh/id_rsa– contains your private key.
- $HOME/.ssh/id_rsa.pub – contain your public key.
Optional syntax for advance users
The following syntax specifies the 4096 of bits in the RSA key to creation (default 2048):
Where,
$ ssh-keygen -t rsa -b 4096 -f ~/.ssh/vps-cloud.web-server.key -C 'My web-server key'
Where,
- -t rsa : Specifies the type of key to create. The possible values are “rsa1” for protocol version 1 and “dsa”, “ecdsa”, “ed25519”, or “rsa” for protocol version 2.
- -b 4096 : Specifies the number of bits in the key to create
- -f ~/.ssh/vps-cloud.web-server.key : Specifies the filename of the key file.
- -C 'My web-server key' : Set a new comment.
2: Install the public key in remote server
Generate A New Ssh Key Linux Server
Use scp or ssh-copy-id command to copy your public key file (e.g., $HOME/.ssh/id_rsa.pub) to your account on the remote server/host (e.g., [email protected]). To do so, enter the following command on your client1.cyberciti.biz:
OR just copy the public key in remote server as authorized_keys in ~/.ssh/ directory:
A note about appending the public key in remote server
On some system ssh-copy-id command may not be installed, so use the following commands (when prompted provide the password for remote user account called vivek) to install and append the public key:
3: Test it (type command on client1.cyberciti.biz)
The syntax is as follows for the ssh command:
Or copy a text file called foo.txt:
Generate A New Ssh Key Linux Free
You will be prompted for a passphrase. To get rid of passphrase whenever you log in the remote host, try ssh-agent and ssh-add commands.
What are ssh-agent and ssh-add, and how do I use them?
To get rid of a passphrase for the current session, add a passphrase to ssh-agent and you will not be prompted for it when using ssh or scp/sftp/rsync to connect to hosts with your public key. The syntax is as follows:
Type the ssh-add command to prompt the user for a private key passphrase and adds it to the list maintained by ssh-agent command:
![Generate A New Ssh Key Linux Generate A New Ssh Key Linux](/uploads/1/3/4/4/134454519/910822502.png)
![Generate A New Ssh Key Linux Generate A New Ssh Key Linux](https://curiousviral.com/wp-content/uploads/2019/08/login.jpg)
Enter your private key passphrase. Now try again to log into [email protected] and you will not be prompted for a password:
One can list public key parameters of all identities with the -L option:
Deleting all private keys from the ssh-agent can be done with the -D option as follows:
When you log out kill the ssh agent, run:
You can also add something like the below to your shell startup to kill ssh-agent at logout:
ssh-add -L
Deleting all private keys from the ssh-agent can be done with the -D option as follows:
ssh-add -D
When you log out kill the ssh agent, run:
kill $SSH_AGENT_PID
You can also add something like the below to your shell startup to kill ssh-agent at logout:
trap 'kill $SSH_AGENT_PID' 0
4: Disable the password based login on a server
Login to your server, type:
Edit /etc/ssh/sshd_config on server1.cyberciti.biz using a text editor such as nano or vim:
Warning: Make sure you add yourself to sudoers files. Otherwise you will not able to login as root later on. See “How To Add, Delete, and Grant Sudo Privileges to Users on a FreeBSD Server” for more info.
$ sudo vim /etc/ssh/sshd_config
OR directly jump to PermitRootLogin line using a vim text editor:
$ sudo vim +/PermitRootLogin /etc/ssh/sshd_config
Find PermitRootLogin and set it as follows:
Save and close the file. I am going to add a user named vivek to sudoers on Ubuntu Linux:
Finally, reload/restart the sshd server, type command as per your Linux/Unix version:
# adduser vivek
Finally, reload/restart the sshd server, type command as per your Linux/Unix version:
5: How to add or replace a passphrase for an existing private key?
To to change your passphrase type the following command:
ssh-keygen -p
6: How do I backup an existing private/public key?
Just copy files to your backup server or external USB pen/hard drive:
How do I protect my ssh keys?
- Always use a strong passphrase.
- Do not share your private keys anywhere online or store in insecure cloud storage.
- Restrict privileges of the account.
How do I create and setup an OpenSSH config file to create shortcuts for servers I frequently access?
See how to create and use an OpenSSH ssh_config file for more info.
Conclusion
This page explained how to set up ssh keys for authentication purposes. For more info see the following resources:
- Man pages – ssh-keygen(1)
- OpenSSH project homepage here.
And, there you have it, ssh set up with public key based authentication for Linux or Unix-like systems.
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