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<article class="markdown-body">
<header>
<h1 class="title">nbde_client</h1>
</header>
<hr>
<nav id="TOC">
<h1 class="toc-title">Contents</h1>
<ul>
<li><a href="#supported-distributions"
id="toc-supported-distributions">Supported Distributions</a></li>
<li><a href="#limitations" id="toc-limitations">Limitations</a></li>
<li><a href="#role-variables" id="toc-role-variables">Role Variables</a>
<ul>
<li><a href="#nbde_client_bindings"
id="toc-nbde_client_bindings">nbde_client_bindings</a></li>
</ul></li>
<li><a href="#example-playbooks" id="toc-example-playbooks">Example
Playbooks</a>
<ul>
<li><a href="#example-1-high-availability"
id="toc-example-1-high-availability">Example 1: high
availability</a></li>
<li><a href="#example-2-remove-binding-from-slot-2-in-devsda1"
id="toc-example-2-remove-binding-from-slot-2-in-devsda1">Example 2:
remove binding from slot 2 in /dev/sda1</a></li>
</ul></li>
<li><a href="#license" id="toc-license">License</a></li>
</ul>
</nav>
<hr>
<p>Ansible role for configuring Network-Bound Disk Encryption clients
(e.g. clevis).</p>
<p>This role currently supports <code>clevis</code> as a provider and it
uses it for operations like encryption and decryption.</p>
<h1 id="supported-distributions">Supported Distributions</h1>
<ul>
<li>RHEL-7+, CentOS-7+</li>
<li>Fedora</li>
</ul>
<h1 id="limitations">Limitations</h1>
<p>This role can currently create <code>tang</code> bindings. TPM2 is
not supported as of now.</p>
<h1 id="role-variables">Role Variables</h1>
<p>These are the variables that can be passed to the role:</p>
<table>
<thead>
<tr class="header">
<th><strong>Variable</strong></th>
<th><strong>Default/Choices</strong></th>
<th><strong>Description</strong></th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td><code>nbde_client_provider</code></td>
<td><code>clevis</code></td>
<td>identifies the provider for the <code>nbde_client</code> role. We
currently support <code>clevis</code>.</td>
</tr>
<tr class="even">
<td><code>nbde_client_bindings</code></td>
<td></td>
<td>a list containing binding configurations, which include e.g. devices
and slots.</td>
</tr>
</tbody>
</table>
<h2 id="nbde_client_bindings">nbde_client_bindings</h2>
<p><code>nbde_client_bindings</code> is a list of dictionaries that
support the following keys:</p>
<table>
<thead>
<tr class="header">
<th><strong>Name</strong></th>
<th><strong>Default/Choices</strong></th>
<th><strong>Description</strong></th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td><code>device</code></td>
<td></td>
<td>specifies the path of the backing device of an encrypted device on
the managed host. This device must be already configured as a LUKS
device before using the role (<strong>REQUIRED</strong>).</td>
</tr>
<tr class="even">
<td><code>encryption_password</code></td>
<td></td>
<td>a valid password or passphrase for opening/unlocking the specified
device. Recommend vault encrypting the value. See <a
href="https://docs.ansible.com/ansible/latest/user_guide/vault.html">https://docs.ansible.com/ansible/latest/user_guide/vault.html</a></td>
</tr>
<tr class="odd">
<td><code>encryption_key_src</code></td>
<td></td>
<td>either the absolute or relative path, on the control node, of a file
containing an encryption key valid for opening/unlocking the specified
device. The role will copy this file to the managed node(s).</td>
</tr>
<tr class="even">
<td><code>state</code></td>
<td><strong>present</strong> / absent</td>
<td>specifies whether a binding with the configuration described should
be added or removed. Setting state to present (the default) means a
binding will be added; setting state to absent means a binding will be
removed from the device/slot.</td>
</tr>
<tr class="odd">
<td><code>slot</code></td>
<td><code>1</code></td>
<td>specifies the slot to use for the binding.</td>
</tr>
<tr class="even">
<td><code>servers</code></td>
<td></td>
<td>specifies a list of servers to bind to. To enable high availability,
specify more than one server here.</td>
</tr>
<tr class="odd">
<td><code>threshold</code></td>
<td><code>1</code></td>
<td>specifies the threshold for the Shamir Secret Sharing (SSS) scheme
that is put in place when using more than one server. When using
multiple servers, threshold indicates how many of those servers should
succeed, in terms of decryption, in order to complete the process of
recovering the LUKS passphrase to open the device.</td>
</tr>
<tr class="even">
<td><code>password_temporary</code></td>
<td><code>false</code></td>
<td>If <code>true</code>, the password or passphrase that was provided
via the <code>encryption_password</code> or <code>encryption_key</code>
arguments will be used to unlock the device and then it will be removed
from the LUKS device after the binding operation completes, i.e. it will
not be valid anymore. To be used if device has been previously created
with a sample password or passphrase (for example by an automated
install like kickstart that set up some sort of "default" password),
which the role should replace by a stronger one.</td>
</tr>
</tbody>
</table>
<p>Example:</p>
<div class="sourceCode" id="cb1"><pre
class="sourceCode yaml"><code class="sourceCode yaml"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="fu">nbde_client_bindings</span><span class="kw">:</span></span>
<span id="cb1-2"><a href="#cb1-2" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="fu">device</span><span class="kw">:</span><span class="at"> /dev/sda1</span></span>
<span id="cb1-3"><a href="#cb1-3" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">encryption_key_src</span><span class="kw">:</span><span class="at"> /vault/keyfile</span></span>
<span id="cb1-4"><a href="#cb1-4" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">state</span><span class="kw">:</span><span class="at"> present</span></span>
<span id="cb1-5"><a href="#cb1-5" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">slot</span><span class="kw">:</span><span class="at"> </span><span class="dv">2</span></span>
<span id="cb1-6"><a href="#cb1-6" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">threshold</span><span class="kw">:</span><span class="at"> </span><span class="dv">1</span></span>
<span id="cb1-7"><a href="#cb1-7" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">password_temporary</span><span class="kw">:</span><span class="at"> </span><span class="ch">false</span></span>
<span id="cb1-8"><a href="#cb1-8" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">servers</span><span class="kw">:</span></span>
<span id="cb1-9"><a href="#cb1-9" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> http://server1.example.com</span></span>
<span id="cb1-10"><a href="#cb1-10" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> http://server2.example.com</span></span></code></pre></div>
<h1 id="example-playbooks">Example Playbooks</h1>
<h2 id="example-1-high-availability">Example 1: high availability</h2>
<div class="sourceCode" id="cb2"><pre
class="sourceCode yaml"><code class="sourceCode yaml"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="pp">---</span></span>
<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a><span class="kw">-</span><span class="at"> </span><span class="fu">hosts</span><span class="kw">:</span><span class="at"> all</span></span>
<span id="cb2-3"><a href="#cb2-3" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">vars</span><span class="kw">:</span></span>
<span id="cb2-4"><a href="#cb2-4" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">nbde_client_bindings</span><span class="kw">:</span></span>
<span id="cb2-5"><a href="#cb2-5" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="fu">device</span><span class="kw">:</span><span class="at"> /dev/sda1</span></span>
<span id="cb2-6"><a href="#cb2-6" aria-hidden="true" tabindex="-1"></a><span class="co"> # recommend vault encrypting the encryption_password</span></span>
<span id="cb2-7"><a href="#cb2-7" aria-hidden="true" tabindex="-1"></a><span class="co"> # see https://docs.ansible.com/ansible/latest/user_guide/vault.html</span></span>
<span id="cb2-8"><a href="#cb2-8" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">encryption_password</span><span class="kw">:</span><span class="at"> password</span></span>
<span id="cb2-9"><a href="#cb2-9" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">servers</span><span class="kw">:</span></span>
<span id="cb2-10"><a href="#cb2-10" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> http://server1.example.com</span></span>
<span id="cb2-11"><a href="#cb2-11" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> http://server2.example.com</span></span>
<span id="cb2-12"><a href="#cb2-12" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">roles</span><span class="kw">:</span></span>
<span id="cb2-13"><a href="#cb2-13" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> linux-system-roles.nbde_client</span></span></code></pre></div>
<h2 id="example-2-remove-binding-from-slot-2-in-devsda1">Example 2:
remove binding from slot 2 in /dev/sda1</h2>
<div class="sourceCode" id="cb3"><pre
class="sourceCode yaml"><code class="sourceCode yaml"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="pp">---</span></span>
<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a><span class="kw">-</span><span class="at"> </span><span class="fu">hosts</span><span class="kw">:</span><span class="at"> all</span></span>
<span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">vars</span><span class="kw">:</span></span>
<span id="cb3-4"><a href="#cb3-4" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">nbde_client_bindings</span><span class="kw">:</span></span>
<span id="cb3-5"><a href="#cb3-5" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="fu">device</span><span class="kw">:</span><span class="at"> /dev/sda1</span></span>
<span id="cb3-6"><a href="#cb3-6" aria-hidden="true" tabindex="-1"></a><span class="co"> # recommend vault encrypting the encryption_password</span></span>
<span id="cb3-7"><a href="#cb3-7" aria-hidden="true" tabindex="-1"></a><span class="co"> # see https://docs.ansible.com/ansible/latest/user_guide/vault.html</span></span>
<span id="cb3-8"><a href="#cb3-8" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">encryption_password</span><span class="kw">:</span><span class="at"> password</span></span>
<span id="cb3-9"><a href="#cb3-9" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">slot</span><span class="kw">:</span><span class="at"> </span><span class="dv">2</span></span>
<span id="cb3-10"><a href="#cb3-10" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">state</span><span class="kw">:</span><span class="at"> absent</span></span>
<span id="cb3-11"><a href="#cb3-11" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">roles</span><span class="kw">:</span></span>
<span id="cb3-12"><a href="#cb3-12" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> linux-system-roles.nbde_client</span></span></code></pre></div>
<h1 id="license">License</h1>
<p>MIT</p>
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