IRed Hat Enterprise Linux 7 uses SSH Protocol 2 and RSA keys by default (see Section 12.1.3, “Protocol Versions” for more information). Important If you complete the steps as root, only root will be able to use the keys.
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- Red Hat Enterprise Linux 6 uses SSH Protocol 2 and RSA keys by default (see Section 14.1.3, “Protocol Versions” for more information). Important Do not generate key pairs as root, as only root would be able to use those keys.
- Ssh-keygen is a tool for creating new authentication key pairs for SSH. Such key pairs are used for automating logins, single sign-on, and for authenticating hosts. Such key pairs are used for automating logins, single sign-on, and for authenticating hosts.
- Nov 10, 2019 Setup SSH Passwordless Login on CentOS 7. To enable the passwordless login, we have to put the public key entry of the client machine on the server’s /.ssh/authorizedkeys. This method involves generating an SSH key pair on the source machine and place it on the destination machine by login into it manually.
- To check if an SSH public key has been generated, open Terminal on Linux or Mac, or Git Bash on Windows. Run ls -la /.ssh. This will list the files in the.ssh directory. If you see files named either idrsa.pub or iddsa.pub, then the key has been generated and you can skip to Adding an SSH Public Key to the Platform via FHC.
am a new RHEL 8 server sysadmin. How do I configure SSH public key-based authentication for RHEL (Red Hat Enterprise Linux) 8 server?
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Introduction – SSH is an acronym for secure shell. It is a suite of cryptographic network protocol. It allows users to log in and transfer files securely over the unsecure network such as the Internet. OpenSSH is an implementation of SSH protocol on RHEL 8. You can log in using RHEL 8 user and password account. However, OpenSSH project recommends log in using a combination of a private and public SSH keys.
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Sample set up for our RHEL 8 server
Where,
- You generate a key pair on your Linux/Unix/macOS desktop.
- Place the public key on RHEL 8 server.
- One can unlock public key using a private key stored on your desktop with the help of ssh command.
- When both the public and private key correct you can log in without a password.
How do I set up SSH keys on RHEL 8 server?
The procedure to set up SSH key on Red Hat Enteprise Linux 8 server:
- On your local desktop type:
ssh-keygen - Install public key into remote RHEL 8 server using:
ssh-copy-id user@remote-RHEL8-server-ip - Use ssh for password less login:
ssh user@remote-RHEL8-server-ip
Let us see all commands and steps in details.
How to create the ed25519 or RSA key pair
The syntax is:
ssh-keygen -t ed25519
ssh-keygen -t rsa
ssh-keygen -t rsa -b 4096 -f ~/.ssh/aws-lighsail.key -C 'My AWS SSH Keys'
ssh-keygen -t ed25519 -f ~/.ssh/linode-usa-www1-vps.key -C 'My Linode SSH Keys for www'
Where,
- -t rsa OR -t ed25519 : Specifies the type of key to create. The possible values “dsa”, “ecdsa”, “ed25519”, or “rsa” for SSH protocol version 2.
- -b 4096 : Specifies the number of bits in the key to create.
- -f~/.ssh/aws-lighsail.key : Specifies the filename of the key file.
- -C -C 'My AWS SSH Keys' : Set a new comment.
I am going type the following command on my Ubuntu desktop to create the key pair:
$ ssh-keygen -t ed25519
I strongly recommend that you set up a passphrase when prompted.
How to copy the public key
Now our key paid generated and stored in ~/.ssh/ directory. You must copy a public SSH key file named ~/.ssh/id_ed25519.pub (or ~/.ssh/id_rsa.pub if you created RSA key) to the RHEL 8 server. Try the ssh-copy-id command as follows:
$ ssh-copy-id -i ~/.ssh/fileNameHere.pubuser@remote-RHEL8-server-ip
For example:
$ ssh-copy-id -i ~/.ssh/id_ed25519.pub vivek@192.168.2.211
How to log in using ssh and without a password
Now try logging into the machine, with the ssh command as follows:
$ ssh user@rhel-8-server
$ ssh vivek@192.168.2.211
You should be able to log in without a password. If you set up a passphrase, unlock it as follows for your current session so that you don’t have to enter it every time you run ssh, sftp, scp, rsync and other commands:
$ ssh-agent $SHELL
$ ssh-add
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Optional settings for root user
Disable root user log in all together on RHEL 8 via ssh. Log in as root user on RHEL 8 and run following to add a user named vivek to wheel group:
# usermod -aG wheel vivek
# id vivek
Allows users in group wheel can use sudo command to run all commands on RHEL 8 server. Next disable root user login by adding the following line to sshd_config:
# vi /etc/ssh/sshd_config
Disable the password for root login and only allow ssh keys based login:
Save and close the file. Reload the ssh server:
# systemctl reload sshd.service
For more info see “Top 20 OpenSSH Server Best Security Practices“.
Conclusion
You learned how to set up and use SSH keys to manage your RHEL 8 based server. For more info see OpenSSH man pages here.
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When I clone an OS image to a new, identical hardware PC I of course need to change the host name in a couple of places on the new machine. I suspect it is also good practice to generate new ssh keys for use by openssh server. I found an article here http://www.softec.lu/site/DevelopersCor .. rateNewSsh which outlines the process.
I can generate new dsa, ecdsa and rsa keys using the commands in the article. However, I also find an ed25519 key in /etc/ssh. It was dated the same as the other keys - the data I installed the original OS. Employing my usual monkey see monkey copy/paste/tweak approach I tried the commandThe seems to have worked. It generated keypair files, a fingerprint and a randomart image. The -N and -t parameters seem to be correct according to the man page.
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Redhat Ssh Public Key
Can anyone confirm that I have supplied all of the necessary inputs to create a valid ed2519 key? Or a way I can test the key for validity?
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TIA,
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Ken