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ssh_known_hosts Cookbook

The Chef ssh_known_hosts cookbook exposes resource and default recipe for adding hosts and keys to the /etc/ssh_known_hosts file.

  • The default recipe builds /etc/ssh/known_hosts based on search indexes and ohai data.
  • The LWRP provides a way to add custom entries in your own recipes.

You can also optionally put other host keys in a data bag called "ssh_known_hosts". See below for details.

Requirements

Should work on any operating system that supports /etc/ssh/ssh_known_hosts.

The Opscode partial_search cookbook is required for the default recipe, as well as a Chef Server that supports partial search:

  • Opscode Hosted Chef
  • Opscode Private Chef
  • Open Source Chef Server 11

Usage

LWRP

Use the LWRP ssh_known_hosts_entry to append an entry for the specified host in /etc/ssh/ssh_known_hosts. For example:

ssh_known_hosts_entry 'github.com'

This will append an entry in /etc/ssh/ssh_known_hosts like this:

# github.com SSH-2.0-OpenSSH_5.5p1 Debian-6+squeeze1+github8
github.com ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAq2A7hRGmdnm9tUDbO9IDSwBK6TbQa+PXYPCPy6rbTrTtw7PHkccKrpp0yVhp5HdEIcKr6pLlVDBfOLX9QUsyCOV0wzfjIJNlGEYsdlLJizHhbn2mUjvSAHQqZETYP81eFzLQNnPHt4EVVUh7VfDESU84KezmD5QlWpXLmvU31/yMf+Se8xhHTvKSCZIFImWwoG6mbUoWf9nzpIoaSjB+weqqUUmpaaasXVal72J+UX2B+2RPW3RcT0eOzQgqlJL3RKrTJvdsjE3JEAvGq3lGHSZXy28G3skua2SmVi/w4yCE6gbODqnTWlg7+wC604ydGXA8VJiS5ap43JXiUFFAaQ==

You can optionally specify your own key, if you don't want to use ssh-keyscan:

ssh_known_hosts_entry 'github.com' do
  key 'node.example.com ssh-rsa ...'
end

LWRP Attributes

Attribute Description Example Default
host the host to add github.com
key (optional) provide your own key ssh-rsa ... ssh-keyscan -H #{host}
port (optional) the server port that ssh-keyscan will use to gather the public key 2222 22

Default Recipe

Searches the Chef Server for all hosts that have SSH host keys and generates an /etc/ssh/ssh_known_hosts.

Adding custom host keys

There are two ways to add custom host keys. You can either use the provided LWRP (see above), or by creating a data bag called "ssh_known_hosts" and adding an item for each host:

{
  "id": "github",
  "fqdn": "github.com",
  "rsa": "github-rsa-host-key"
}

There are additional optional values you may use in the data bag:

Attribute Description Example Default
id a unique id for this data bag entry github
fqdn the fqdn of the host github.com
rsa the rsa key for this server ssh-rsa AAAAB3...
ipaddress the ipaddress of the node (if fqdn is missing) 1.1.1.1
hostname local hostname of the server (if not a fqdn) myserver.local
dsa the dsa key for this server ssh-dsa ABAAC3...

License and Authors

Copyright:: 2011-2013, Opscode, Inc

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.