May Have Pre-generated Ssh Host Keys

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Ssh Host Key Exploit
Generate Ssh Host Key

Jan 12, 2019 Support for Kali can be obtained via various methods listed on the Kali Linux Community page. These images have a default password of “toor” and may have pre-generated SSH host keys. Configuring public key authentication with Bitvise SSH Client. It may be useful to store the keypair in a profile if the profile is going to be used on other computers, or by a job that runs as a different Windows account on the same computer. For help with importing the public key into Bitvise SSH Server. If you use the standard openssh console client (cygwin or from linux), host keys are stored, one-per-line, in /.ssh/knownhosts. From there, it's a simple matter of figuring out which bit of that host key is needed for your library. Putty also stores host keys, but it appears to encode them in hex.

On some operating systems, when you first log in to the CLI, you may be prompted to add the key fingerprint of the Oracle VM Manager host to the ~/.ssh/known_hosts file, for example:

Ssh Host Key Exploit

If you want to avoid this message and have host keys automatically added to the known_hosts file, you can turn off strict checking of SSH host keys using the following command:

If you have upgraded or reinstalled Oracle VM Manager, you may be prompted that the host identification has changed when connecting to the CLI, for example:

To clear this message and allow connections to the CLI, use the ssh-keygen utility to remove the entry for the Oracle VM Manager host, for example:

You may need to add braces around the hostname if the previous command does not remove the entry, for example:

On first use of sshd, the key pair for the host will be automatically generated. If ssh-agent is running, the keys will be automatically added to the local store. To make key authentication easy with an SSH server, run the following commands from an elevated PowerShell prompt: # Install the OpenSSHUtils module to the server. SSH key pair's are machine independent, which means you can create a SSH key pair on one machine and can deploy the same SSH key pair on multiple machines. It is valid thing to do, thats how you must do it. Moreover Git uses SSH for transport, so you can clone/download the Git on both the machines having the same SSH key pair.

Alternatively, edit the ~/.ssh/known_hosts file and remove the entry for the Oracle VM Manager host.

+-+Copy the key to the clipboard: xclip -sel clip Key Pairs:OpenStack can inject a public ssh key into an instance on launch, so that it’s ready for you to access using the private key once it is ready. $ ssh-keygen -t rsa -b 4096Generating public/private rsa key pair.Enter file in which to save the key (/home/josphat/.ssh/idrsa):Created directory '/home/josphat/.ssh'.Enter passphrase (empty for no passphrase):Enter same passphrase again:Your identification has been saved in /home/josphat/.ssh/idrsa.Your public key has been saved in /home/josphat/.ssh/idrsa.pub.The key fingerprint is:28:14:e0:14:11:0d:77:23:2d:6c:65:12:4e:26:a1:deThe key's randomart image is:+- RSA 4096-+ XXO+= +.=.o. S.

Connect to the CLI again and you are prompted to add the new fingerprint if strict checking of SSH host keys is enabled.

ow do I regenerate OpenSSH sshd server host keys stored in /etc/ssh/ssh_host_* files? Can I safely regenerate ssh host keys using remote ssh session as my existing ssh connections shouldn’t be interrupted on Debian or Ubuntu Linux? How do I regenerate new ssh server keys? How to regenerate new host keys on a Debian or Ubuntu Linux?
[donotprint][/donotprint]To regenerate keys you need to delete old files and reconfigure openssh-server. It is also safe to run following commands

Generate Ssh Host Key

over remote ssh based session. Your existing session shouldn’t be interrupted.

Why regenerate new ssh server keys?

Most Linux and Unix distribution create ssh keys for you during the installation of the OpenSSH server package. But it may be useful to be able re-generate new server keys from time to time. For example, when you duplicate VM (KVM or container) which contains an installed ssh package and you need to use different keys from cloned KVM VM guest/machine.

Steps to regenerate OpenSSH host keys on Linux

Let us see all steps

Step 1 – Delete old ssh host keys

Login as the root and type the following command to delete files on your SSHD server:
# /bin/rm -v /etc/ssh/ssh_host_*
Sample outputs:

Step 2 – Debian or Ubuntu Linux Regenerate OpenSSH Host Keys

Now create a new set of keys on your SSHD server, enter:
# dpkg-reconfigure openssh-server
Sample output:

You just regenerated new ssh server keys. You need to restart ssh server:
$ sudo systemctl restart ssh
OR
$ /etc/init.d/ssh restart

Step 3 – Update all ssh client(s) known_hosts files

Finally, you need to update ~/.ssh/known_hosts files on client computers, otherwise everyone will see an error message that read as follows:

Either remove host fingerprint or update the file using vi text editor (command must be typed on client machine):
$ ssh-keygen -R remote-server-name-here
Now login using the ssh command:
$ ssh [email protected]

Conclusion

You just regenerated OpenSSH Host Keys on a Debian or Ubuntu Linux using the dpkg-reconfigure command. For more info see the man page or this wiki page here:
$ man dpkg-reconfigure $ man sshd