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features:
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Restrict nova migration ssh tunnel
* The ssh authorized_keys file is only writeable by root.
* Creates a new user for migration instead of using root/nova.
* Disables SSH forwarding for this user.
* Restricts the networks that this user can connect from.
* Uses an ssh wrapper command to whitelist the commands that this user can run over ssh.
Adds new parameter "tripleo::profile::base::nova::migration_ssh_localaddrs" to specify which incoming IPs are allow for SSH tunnel connections.
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