0k-charms/rsync-backup-target/README.org

rsync-backup-target

• Configuration example
  • Adding new keys for backup
• Troubleshooting
  • Faking access from client
  • Direct ssh access should be refused
  • Wrong directory should be refused

Usage of this service

Configuration example

rsync-backup-target:
  # docker-compose:
  #   ports:
  #     - "10023:22"
  options:
    admin:   ## These keys are for the allowed rsync-backup to write stuff with rsync
      myadmin: "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDESdz8bWtVcDQJ68IE/KpuZM9tAq\
        ZDXGbvEVnTg16/yWqBGQg0QZdDjISsPn7D3Zr64g2qgD9n7EZghfGP9TkitvfrBYx8p\
        7JkkUyt8nxklwOlKZFD5b3PF2bHloSsmjnP8ZMp5Ar7E+tn1guGrCrTcFIebpVGR3qF\
        hRN9AlWNR+ekWo88ZlLJIrqD26jbWRJZm4nPCgqwhJwfHE3aVwfWGOqjSp4ij+jr2ac\
        Arg7eD4clBPYIqKlqbfNRD5MFAH9sbB6jkebQCAUwNRwV7pKwCEt79HnCMoMjnZh6Ww\
        6TlHIFw936C2ZiTBuofMx7yoAeqpifyzz/T5wsFLYWwSnX rsync@zen"

Adding new keys for backup

This can be done through the admin accounts configured in compose.yml.

You can use then ssh myadmin@$RSYNC_BACKUP_TARGET ssh-key:

$ ssh myadmin@$RSYNC_BACKUP_TARGET ssh-key ls
$ ssh myadmin@$RSYNC_BACKUP_TARGET ssh-key add "ssh-rsa AAA...Jdhwhv rsync@sourcelabel"
$ ssh myadmin@$RSYNC_BACKUP_TARGET ssh-key ls
..Jdhwhv sourcelabel
$ ssh myadmin@$RSYNC_BACKUP_TARGET ssh-key rm sourcelabel
$ ssh myadmin@$RSYNC_BACKUP_TARGET ssh-key ls
$

Troubleshooting

Faking access from client

This should work:

RSYNC_BACKUP_TARGET_IP=172.18.0.2
rsync -azvA -e "ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no" \
  /tmp/toto "$RSYNC_BACKUP_TARGET":/var/mirror/client1

Direct ssh access should be refused

RSYNC_BACKUP_TARGET_IP=172.18.0.2
ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no \
  "$RSYNC_BACKUP_TARGET"

Wrong directory should be refused

RSYNC_BACKUP_TARGET_IP=172.18.0.2
rsync -azvA -e "ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no" \
  /tmp/toto "$RSYNC_BACKUP_TARGET":/var/mirror/client2