SSH authorized_keys

1. What is SSH authorized_keys?
2. Is Known_hosts same as authorized_keys?
3. Who should own authorized_keys?
4. How to generate 4096 SSH key?
5. How to add public keys to SSH?
6. What are the 4 SSH server authentication methods?
7. Where is authorized_keys located?
8. What are SSH authentication methods?
9. What is the difference between authorized_keys and authorized_keys2?
10. What is the difference between authorized_keys and id_rsa in SSH?
11. Can I delete authorized_keys?
12. What is SSH keyring?
13. Where is the SSH authorized_keys file?
14. Where do I find authorized_keys?
15. Should I restart SSH after adding authorized_keys?

What is SSH authorized_keys?

The authorized_keys file in SSH specifies the SSH keys that can be used for logging into the user account for which the file is configured. It is a highly important configuration file, as it configures permanent access using SSH keys and needs proper management.

Is Known_hosts same as authorized_keys?

authorized_keys is a file that allows you to add ssh public keys of users that should be allowed to log into your server (the server in which the authorized_keys file lives) using key based auth. known_hosts is a file that contains a list of keys from... known hosts that you have logged into.

Who should own authorized_keys?

The authorized_keys file should have 644 permissions and be owned by the user. The next time you connect with SSH you should not have to enter your password.

How to generate 4096 SSH key?

Generating an SSH key pair

Open your terminal and run the following command, using your own email address: $ ssh-keygen -t rsa -b 4096 -C "[email protected]" Generating public/private rsa key pair. When the key pair was created, you're asked to enter a filename where to save the key.

How to add public keys to SSH?

On your computer, in the PuTTYgen utility, copy the contents of the public key (displayed in the area under "Key") onto your Clipboard. Then, on the remote system, use your favorite text editor to paste it onto a new line in your ~/. ssh/authorized_keys file, and then save and close the file.

What are the 4 SSH server authentication methods?

There are essentially four ways you can implement passwordless SSH access. SSH certificate-based authentication, SSH key-based authentication, SSH host-based authentication, or using a custom PAM module that supports out-of-band authentication.

Where is authorized_keys located?

The authorized_keys file in SSH specifies the SSH keys that can be used for logging into the user account for which the file is configured. This file is usually found in the user's home directory under <user-home>/. ssh/authorized_keys .

What are SSH authentication methods?

The two widely used methods of SSH authentication for secure remote access are: Password authentication (using user name and passwords) Public key-based authentication (using public and private key pairs)

What is the difference between authorized_keys and authorized_keys2?

ssh/authorized_keys file lists the RSA keys that are permitted for RSA authentication in SSH protocols 1.3 and 1.5 Similarly, the $HOME/. ssh/authorized_keys2 file lists the DSA and RSA keys that are permitted for public key authentication (PubkeyAuthentication) in SSH protocol 2.0.

What is the difference between authorized_keys and id_rsa in SSH?

authorized_keys is used by the daemon to determine whether a key (offered by a connecting client) is allowed to access the host it's running on. id_rsa and other key files are used by the client (by default, unless the -i option is given) as sources of keys to offer targets it's trying to connect to.

Can I delete authorized_keys?

Delete SSH Key

SSH to your server. Edit ~/. ssh/authorized_keys. Remove the line containing your key.

What is SSH keyring?

keychain is a manager for ssh-agent, typically run from ~/. bash_profile. It allows your shells and cron jobs to easily share a single ssh-agent process. By default, the ssh- agent started by keychain is long-running and will continue to run, even after you have logged out from the system.

Where is the SSH authorized_keys file?

Location of the Authorized Keys File

With OpenSSH, the authorized keys are by default configured in . ssh/authorized_keys in the user's home directory. Many OpenSSH versions also look for ssh/authorized_keys2 .

Where do I find authorized_keys?

Authorized keys are configured separately for each user - usually in the . ssh/authorized_keys file in the user's home directory. However, the location of the keys can be configured in SSH server configuration files, and is often changed to a root-owned location in more secure environments.

Should I restart SSH after adding authorized_keys?

Most documentation suggest to add a public key to $HOME/. ssh/authorized_keys and then to restart the sshd service ( systemctl restart sshd ).