How do I create a host key file to use with my applications as I can not use system defined /etc/ssh/ssh_host_rsa_key for non-root account under Linux / Unix / Apple OS X / *BSD operating systems?
You need to use a command called ssh-keygen. This command generates, manages and converts authentication keys for ssh. It can create RSA keys for use by SSH protocol version 1 and RSA or DSA keys for use by SSH protocol version 2. he type of key to be generated is specified with the -t option. If invoked without any arguments, ssh-keygen will generate an RSA key for use in SSH protocol 2 connections. The -f option specifies the filename of the key file.
You need to use a command called ssh-keygen. This command generates, manages and converts authentication keys for ssh. It can create RSA keys for use by SSH protocol version 1 and RSA or DSA keys for use by SSH protocol version 2. he type of key to be generated is specified with the -t option. If invoked without any arguments, ssh-keygen will generate an RSA key for use in SSH protocol 2 connections. The -f option specifies the filename of the key file.
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Why create a new host key files?
You may need a new key file:
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- Your system is compromised.
- Your keys are stolen.
- You forgotten the passphrase.
- Your application need a new host key.
- You can not read the default system key files stored in /etc/ssh/ directory but your non-root application needs key.
- You got an error message which read as “Could not load host key: /etc/ssh/ssh_host_key*”.
ssh-keygen Syntax
The syntax is:
Example
Create a host key file in your $HOME/.ssh/myapp as follows. First, create a directory to store your host key file, enter:
To create a host RSAv2 key file, run:
Sample outputs:
$ mkdir -p $HOME/.ssh/myapp
To create a host RSAv2 key file, run:
$ ssh-keygen -t rsa -f $HOME/.ssh/myapp/rsa_key_file
Sample outputs:
Type the following commands to verify the keys:
Sample outputs:
$ ls -l $HOME/.ssh/myapp/
Sample outputs:
You can now use keys with your app:
$ mycool-app -key $HOME/.ssh/myapp/rsa_key_file -d
Create New Ssh Key
Rsa Vs Dsa Ssh Keys
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My Google is failing me.
So, you know when you start up a new Linux server with OpenSSH-Server for the FIRST time, you generate a server key pair? Anyone know what script runs that?
What would happen if you re-ran the script on a machine that's been up and connected for a while? If no one knows the answer to the second one, I'll try it with some throwaway VMs.
Note: I am not talking about ssh-keygen -t dsa/rsa for normal users, I am talking about SERVER ssh keys.
Here's an example on a Debian install:
So, you know when you start up a new Linux server with OpenSSH-Server for the FIRST time, you generate a server key pair? Anyone know what script runs that?
What would happen if you re-ran the script on a machine that's been up and connected for a while? If no one knows the answer to the second one, I'll try it with some throwaway VMs.
Note: I am not talking about ssh-keygen -t dsa/rsa for normal users, I am talking about SERVER ssh keys.
Here's an example on a Debian install:
Linux Generate Ssh_host_dsa_key Password
Setting up openssh-server (1:5.5p1-6+squeeze1) ..
Creating SSH2 RSA key; this may take some time ..
Creating SSH2 DSA key; this may take some time ..
Restarting OpenBSD Secure Shell server: sshd.
Creating SSH2 RSA key; this may take some time ..
Creating SSH2 DSA key; this may take some time ..
Restarting OpenBSD Secure Shell server: sshd.