Chef SSH

Description

Provides 3 LWRPs to manage system-wide and per-user ssh_config and known_host files.

Setup

Include the ssh cookbook via Berkshelf or Librarian.

cookbook "ssh"

Or add the following line to your cookbook's metadata.rb.

depends "ssh"

Usage

When using SSH with Chef deployments, it's crucial to not get any prompts for input. Adding entries to known_hosts files and better managing your per-connection configuration can help with this.

An important thing to note is that if you create a user during a chef run, be sure to reload OHAI data so that the new user will be in the node data. For instance:

ohai "reload_passwd" do
    plugin "passwd"
end

The ssh cookbook bypasses this need somewhat by using ohai classes directly to discover your users' ssh paths. However
some of your cookbooks may not be as generous.

Resources and Providers

known_hosts

Actions

<table>
<thead>
<tr>
<th>Action</th><th>Description</th><th>Default</th>
</tr>
</thead>
<tbody>
<tr>
<td>add</td>
<td>Adds an entry for the given host to a known_hosts file</td>
<td>Yes</td>
</tr>
<tr>
<td>remove</td>
<td>Removes entries for a host from a known_hosts file</td>
<td> </td>
</tbody>
</table>

Attributes

<table>
<thead>
<tr>
<th>Attribute</th><th>Description</th><th>Default Value</th>
</tr>
</thead>
<tbody>
<tr>
<td>host</td>
<td>
<b>Name attribute:</b> the FQDN for a host to add to a known_hosts file
</td>
<td><code>nil</code></td>
</tr>
<tr>
<td>hashed</td>
<td>A Boolean indicating if SSH is configured to use a hashed known_hosts file.
</td>
<td><code>true</code></td>
</tr>
<tr>
<td>key</td>
<td>A full line to add to the file, instead of performing a lookup for the host.
</td>
<td><code>nil</code></td>
</tr>
<tr>
<td>user</td>
<td>A username to add the known_hosts entry for. If unspecified, the known_host will be added system-wide. <b>Note:</b> if specified, the user
must already exist.
</td>
<td><code>nil</code></td>
</tr>
<tr>
<td>path</td>
<td>A full path to a known_hosts file. If used with the user attribute, this will take precedence over the path to a user's file, but the file will be created (if necessary) as that user.
</td>
<td><code>nil</code></td>
</tr>
</tbody>
</table>

Example

ssh_known_hosts "github.com" do
  hashed true
  user 'webapp'
end

config

Actions

<table>
<thead>
<tr>
<th>Action</th><th>Description</th><th>Default</th>
</tr>
</thead>
<tbody>
<tr>
<td>add</td>
<td>Adds an entry for the given host to a ssh_config file</td>
<td>Yes</td>
</tr>
<tr>
<td>remove</td>
<td>Removes entries for a host from a ssh_config file</td>
<td> </td>
</tbody>
</table>

Attributes

<table>
<thead>
<tr>
<th>Attribute</th><th>Description</th><th>Default Value</th>
</tr>
</thead>
<tbody>
<tr>
<td>host</td>
<td>
<b>Name attribute:</b> the string to match when connecting to a host. This can be an IP, FQDN (github.com), or contain wildcards (*.prod.corp)
</td>
<td><code>nil</code></td>
</tr>
<tr>
<td>options</td>
<td>A hash containing the key-values to write for the host in
</td>
<td><code>true</code></td>
</tr>
<tr>
<td>user</td>
<td>A username to add the ssh_config entry for. If unspecified, the entry will be added system-wide. <b>Note:</b> if specified, the user
must already exist.
</td>
<td><code>nil</code></td>
</tr>
<tr>
<td>path</td>
<td>A full path to a ssh config file. If used with the user attribute, this will take precedence over the path to a user's file, but the file will be created (if necessary) as that user.
</td>
<td><code>nil</code></td>
</tr>
</tbody>
</table>

Example

ssh_config "github.com" do
  options 'User' => 'git', 'IdentityFile' => '/var/apps/github_deploy_key'
  user 'webapp'
end

authorized_keys

The authorized_keys LWRP is considered Beta due to the lack of tests for this resource. Use at your own risk,
and feel free to submit a PR for adding more tests.

Also of important note, typically when SSH keys are generated, the resulting file will have the type, key, and a comment.
The typical comment is just the username@host. This is NOT part of the key. When setting your attributes,
please be sure to set only the key in the key field. See the example if you are still uncertain.

Actions

<table>
<thead>
<tr>
<th>Action</th><th>Description</th><th>Default</th>
</tr>
</thead>
<tbody>
<tr>
<td>add</td>
<td>Adds an entry to the given user's authorized_keys file</td>
<td>Yes</td>
</tr>
<tr>
<td>remove</td>
<td>Removes an entry from the given user's authorized_keys file</td>
<td> </td>
<\tr>
<tr>
<td>modify</td>
<td>Updates an existing entry to the user's authorized_keys file, but only if the indicated key is present</td>
<td> </td>
<\tr>
</tbody>
</table>

* please note that there is no name attribute for this resource. The name you assign is not used in the provider

Attributes

<table>
<thead>
<tr>
<th>Attribute</th><th>Description</th><th>Default Value</th>
</tr>
</thead>
<tbody>
<tr>
<td>type</td>
<td>
A string representing the type of key. Options include id-rsa, ssh-dss, ssh-ed25519 and others
</td>
<td><code>id-rsa</code></td>
</tr>
<tr>
<td>options</td>
<td>
A hash containing the key-value pairs for options. Binary options such as no-port-forwarding should have a value of nil
</td>
<td><code>{}</code></td>
</tr>
<tr>
<td>user</td>
<td>
The user for which this key should be added
</td>
<td>none - REQUIRED</td>
</tr>
<tr>
<td>comment</td>
<td>
a comment to add to this entry (generally the useranme@host is added as a comment, but this is not required)
</td>
<td><code>''</code></td>
</tr>
<tr>
<td>key</td>
<td>
the actual key
</td>
<td>none - REQUIRED</td>
</tr>
</tbody>
</table>

Example

<syntaxhightlight lang="ruby">
ssh_authorized_keys "for remote access" do
options { 'cert-authority' => nil, :command => '/usr/bin/startup' }
user 'admin'
key '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'
type 'id-rsa'
comment 'gdidy@coolman.com'
end
</syntaxhighlight>