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As there are two different types of certificates, there are two individual tasks as well in order to setup a hosts. client.

• Host Certificate
• Client Certificate

If one would like to use only one certificate, execute the corresponding tasksubtask.

Configuration paths

There are two different options to tell the ssh daemon about the certificate: 'user based' (recommended)  or 'global'


• 'user based': The certificate is valid for one specific user on the client.

  Code Block
  language bash
  SSH_CERTIFICATES=$HOME/.ssh/netdef SSH_CONFIG=$HOME/.ssh/config SSH_KNOWNHOSTS=$HOME/.ssh/known_hosts

  
  

• 'global': The certificate is valid for each user on the client.

  Code Block
  language bash
  SSH_CERTIFICATES=/etc/ssh/netdef SSH_CONFIG=/etc/ssh/ssh_config SSH_KNOWNHOSTS=/etc/ssh/ssh_known_hosts

  
  

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Step 1 - Setup cert-authority

To setup the host certificate the public key of the CA authority is needed. There are three public keys called  'yubikey1.pub', 'yubikey2.pub' and 'yubikey3.pub'.

Add the following line to '$SSH_KNOWNHOSTS' where 'yubikeyX.pub' must be replaced with the public key stored in 'yubikeyX.pub'.

@cert-authority *.netdef.org `yubikey1.pub`
@cert-authority *.netdef.org `yubikey2.pub`
@cert-authority *.netdef.org `yubikey3.pub`

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- Client Certificate

Step 1 - Sign client's public key

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