- I'm working on a Ruby/Rack application that needs to generate SSH keypairs. As much as I'd like to call ssh-keygen from the application, I can't because it's designed to run on Heroku and they don't support calling that command. I've been able to get private/public RSA keys using OpenSSL in the Ruby standard library doing the following.
- Use the Command to generate the key. Ssh-keygen -t rsa To Copy use the command give your source and destination. Ssh-copy-id You can change the permission to 700 in.ssh folder.
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.
Why create a new host key files?
You can also add a host pattern in your /.ssh/config so you don't have to specify the key algorithm every time. Host nas HostName 192.168.8.109 HostKeyAlgorithms=+ssh-dss This has the added benefit that you don't need to type out the IP address.
You may need a new key file:
- 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*'.
Generate Dsa Key Ssh-keygen
ssh-keygen Syntax
The syntax is:
Ssh Keygen Public Key
Example
Create a host key file in your $HOME/.ssh/myapp as follows. First, create a directory to store your host key file, enter:$ mkdir -p $HOME/.ssh/myapp
To create a host RSAv2 key file, run:$ ssh-keygen -t rsa -f $HOME/.ssh/myapp/rsa_key_file
Sample outputs:
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Type the following commands to verify the keys:$ ls -l $HOME/.ssh/myapp/
Sample outputs:
Openssl generate public key der. I have a.cer certificate file, and need to extract the Public Key. I can only extract to PEM format. The 'outform' parameter does nothing. Openssl x509 -inform PEM -in certificate.cer -outform DER -pubkey -noout publickey.der.
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You can now use keys with your app:$ mycool-app -key $HOME/.ssh/myapp/rsa_key_file -d
Ssh Rsa Keygen
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