There are two different things needed to setup the certificate authentification.
user certificates: There are N user certifiactes, one for each public key provided for signing.
helloworld-1234567890-1-cert.pub helloworld-1234567890-2-cert.pub ... helloworld-1234567890-N-cert.pub |
host certificate public key: There is one public key to authenticate servers.
yubikeyX.pub |
There are two different options to tell the ssh daemon about the certificate: global
or user based
.
global
: The certificate is valid for each user on the client.user based
: The certificate is valid for one specific user on the client.To work correctly there are two things that need to be done:
The certificates can be installed for a single user or for all users in a machine.
SSH_CERTIFICATES=$HOME/.ssh/netdef SSH_CONFIG=$HOME/.ssh/config SSH_KNOWNHOSTS=$HOME/.ssh/known_hosts |
SSH_CERTIFICATES=/etc/ssh/netdef SSH_CONFIG=/etc/ssh/ssh_config SSH_KNOWNHOSTS=/etc/ssh/ssh_known_hosts |
Copy all certificates that can be found in this tar to the folder $SSH_CERTIFICATES
.
mkdir -p $SSH_CERTIFICATES cp *cert.pub $SSH_CERTIFICATES |
Add the following lines to $SSH_CONFIG
. $SSH_CERTIFICATES
must be replaced with the correct path to the folder.
Host *.netdef.org CertificateFile `$SSH_CERTIFICATES`/helloworld-1234567890-1-cert.pub CertificateFile `$SSH_CERTIFICATES`/helloworld-1234567890-2-cert.pub ... CertificateFile `$SSH_CERTIFICATES`/helloworld-1234567890-N-cert.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 `yubikeyX.pub` |