Setup Restricted SFTP for download.omniosce.org

Convert the cert into ssh authorized_keys compatible format

openssl x509 -in newcerts/1002.pem -pubkey -noout | ssh-keygen -i  -m PKCS8 -f /dev/stdin

Add the result to the ~archive/.ssh/authorized_keys file.

Users will only get access to /archive because of this setting in /etc/ssh/sshd_config

Match User archive
	ForceCommand internal-sftp
	ChrootDirectory /archive

To access the archive, the guardian will put the following into .ssh/config

Host omniosce-archive
     Hostname omniosce.ee.ethz.ch
     User archive
     IdentityFile ~/.ssh/omniosce.key.pem     
     Port 8114