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<article class="markdown-body">
<header>
<h1 class="title">OpenSSH Server</h1>
</header>
<hr>
<nav id="TOC">
<h1 class="toc-title">Contents</h1>
<ul>
<li><a href="#requirements" id="toc-requirements">Requirements</a>
<ul>
<li><a href="#optional-requirements"
id="toc-optional-requirements">Optional requirements</a></li>
</ul></li>
<li><a href="#role-variables" id="toc-role-variables">Role variables</a>
<ul>
<li><a href="#primary-role-variables"
id="toc-primary-role-variables">Primary role variables</a>
<ul>
<li><a href="#sshd_enable" id="toc-sshd_enable">sshd_enable</a></li>
<li><a href="#sshd_skip_defaults"
id="toc-sshd_skip_defaults">sshd_skip_defaults</a></li>
<li><a href="#sshd_manage_service"
id="toc-sshd_manage_service">sshd_manage_service</a></li>
<li><a href="#sshd_allow_reload"
id="toc-sshd_allow_reload">sshd_allow_reload</a></li>
<li><a href="#sshd_install_service"
id="toc-sshd_install_service">sshd_install_service</a></li>
<li><a href="#sshd_manage_firewall"
id="toc-sshd_manage_firewall">sshd_manage_firewall</a></li>
<li><a href="#sshd_manage_selinux"
id="toc-sshd_manage_selinux">sshd_manage_selinux</a></li>
<li><a href="#sshd" id="toc-sshd">sshd</a></li>
<li><a href="#sshd_optionname"
id="toc-sshd_optionname">sshd_<code>&lt;OptionName&gt;</code></a></li>
<li><a href="#sshd_match-sshd_match_1-through-sshd_match_9"
id="toc-sshd_match-sshd_match_1-through-sshd_match_9">sshd_match,
sshd_match_1 through sshd_match_9</a></li>
<li><a href="#sshd_backup" id="toc-sshd_backup">sshd_backup</a></li>
<li><a href="#sshd_sysconfig"
id="toc-sshd_sysconfig">sshd_sysconfig</a></li>
<li><a href="#sshd_sysconfig_override_crypto_policy"
id="toc-sshd_sysconfig_override_crypto_policy">sshd_sysconfig_override_crypto_policy</a></li>
<li><a href="#sshd_sysconfig_use_strong_rng"
id="toc-sshd_sysconfig_use_strong_rng">sshd_sysconfig_use_strong_rng</a></li>
<li><a href="#sshd_config_file"
id="toc-sshd_config_file">sshd_config_file</a></li>
<li><a href="#sshd_main_config_file"
id="toc-sshd_main_config_file">sshd_main_config_file</a></li>
<li><a href="#sshd_config_namespace"
id="toc-sshd_config_namespace">sshd_config_namespace</a></li>
<li><a href="#sshd_config_owner-sshd_config_group-sshd_config_mode"
id="toc-sshd_config_owner-sshd_config_group-sshd_config_mode">sshd_config_owner,
sshd_config_group, sshd_config_mode</a></li>
<li><a href="#sshd_verify_hostkeys"
id="toc-sshd_verify_hostkeys">sshd_verify_hostkeys</a></li>
<li><a href="#sshd_hostkey_owner-sshd_hostkey_group-sshd_hostkey_mode"
id="toc-sshd_hostkey_owner-sshd_hostkey_group-sshd_hostkey_mode">sshd_hostkey_owner,
sshd_hostkey_group, sshd_hostkey_mode</a></li>
</ul></li>
<li><a href="#secondary-role-variables"
id="toc-secondary-role-variables">Secondary role variables</a>
<ul>
<li><a href="#sshd_packages"
id="toc-sshd_packages">sshd_packages</a></li>
<li><a href="#sshd_binary" id="toc-sshd_binary">sshd_binary</a></li>
<li><a href="#sshd_service" id="toc-sshd_service">sshd_service</a></li>
<li><a href="#sshd_sftp_server"
id="toc-sshd_sftp_server">sshd_sftp_server</a></li>
</ul></li>
<li><a href="#variables-exported-by-the-role"
id="toc-variables-exported-by-the-role">Variables Exported by the
Role</a>
<ul>
<li><a href="#sshd_has_run" id="toc-sshd_has_run">sshd_has_run</a></li>
</ul></li>
</ul></li>
<li><a href="#configure-ssh-certificate-authentication"
id="toc-configure-ssh-certificate-authentication">Configure SSH
certificate authentication</a>
<ul>
<li><a href="#additional-variables"
id="toc-additional-variables">Additional variables</a>
<ul>
<li><a href="#sshd_trusted_user_ca_keys_list"
id="toc-sshd_trusted_user_ca_keys_list">sshd_trusted_user_ca_keys_list</a></li>
<li><a
href="#sshd_trustedusercakeys_directory_owner-shsd_trustedusercakeys_directory_group-sshd_trustedusercakeys_directory_mode"
id="toc-sshd_trustedusercakeys_directory_owner-shsd_trustedusercakeys_directory_group-sshd_trustedusercakeys_directory_mode">sshd_trustedusercakeys_directory_owner,
shsd_trustedusercakeys_directory_group,
sshd_trustedusercakeys_directory_mode</a></li>
<li><a
href="#sshd_trustedusercakeys_file_owner-shsd_trustedusercakeys_file_group-sshd_trustedusercakeys_file_mode"
id="toc-sshd_trustedusercakeys_file_owner-shsd_trustedusercakeys_file_group-sshd_trustedusercakeys_file_mode">sshd_trustedusercakeys_file_owner,
shsd_trustedusercakeys_file_group,
sshd_trustedusercakeys_file_mode</a></li>
<li><a href="#sshd_principals"
id="toc-sshd_principals">sshd_principals</a></li>
<li><a
href="#sshd_authorizedprincipals_directory_owner-shsd_authorizedprincipals_directory_group-sshd_authorizedprincipals_directory_mode"
id="toc-sshd_authorizedprincipals_directory_owner-shsd_authorizedprincipals_directory_group-sshd_authorizedprincipals_directory_mode">sshd_authorizedprincipals_directory_owner,
shsd_authorizedprincipals_directory_group,
sshd_authorizedprincipals_directory_mode</a></li>
<li><a
href="#sshd_authorizedprincipals_file_owner-shsd_authorizedprincipals_file_group-sshd_authorizedprincipals_file_mode"
id="toc-sshd_authorizedprincipals_file_owner-shsd_authorizedprincipals_file_group-sshd_authorizedprincipals_file_mode">sshd_authorizedprincipals_file_owner,
shsd_authorizedprincipals_file_group,
sshd_authorizedprincipals_file_mode</a></li>
</ul></li>
<li><a href="#additional-configuration"
id="toc-additional-configuration">Additional configuration</a></li>
</ul></li>
<li><a href="#dependencies" id="toc-dependencies">Dependencies</a></li>
<li><a href="#example-playbook" id="toc-example-playbook">Example
Playbook</a></li>
<li><a href="#template-generation" id="toc-template-generation">Template
Generation</a></li>
<li><a href="#rpm-ostree" id="toc-rpm-ostree">rpm-ostree</a></li>
<li><a href="#license" id="toc-license">License</a></li>
<li><a href="#authors" id="toc-authors">Authors</a></li>
</ul>
</nav>
<hr>
<p>This role configures the OpenSSH daemon. It:</p>
<ul>
<li>By default configures the SSH daemon with the normal OS
defaults.</li>
<li>Works across a variety of <code>UN*X</code> distributions</li>
<li>Can be configured by dict or simple variables</li>
<li>Supports Match sets</li>
<li>Supports all <code>sshd_config</code> options. Templates are
programmatically generated. (see <a
href="meta/make_option_lists"><code>meta/make_option_lists</code></a>)</li>
<li>Tests the <code>sshd_config</code> before reloading sshd.</li>
</ul>
<p><strong>WARNING</strong> Misconfiguration of this role can lock you
out of your server! Please test your configuration and its interaction
with your users configuration before using in production!</p>
<p><strong>WARNING</strong> Digital Ocean allows root with passwords via
SSH on Debian and Ubuntu. This is not the default assigned by this
module - it will set <code>PermitRootLogin without-password</code> which
will allow access via SSH key but not via simple password. If you need
this functionality, be sure to set <code>sshd_PermitRootLogin yes</code>
for those hosts.</p>
<h1 id="requirements">Requirements</h1>
<p>Tested on:</p>
<ul>
<li>Ubuntu precise, trusty, xenial, bionic, focal, jammy, noble
<ul>
<li><a
href="https://github.com/willshersystems/ansible-sshd/actions/workflows/ansible-ubuntu.yml"><img
src="https://github.com/willshersystems/ansible-sshd/actions/workflows/ansible-ubuntu.yml/badge.svg"
alt="Run tests on Ubuntu latest" /></a></li>
</ul></li>
<li>Debian wheezy, jessie, stretch, buster, bullseye, bookworm
<ul>
<li><a
href="https://github.com/willshersystems/ansible-sshd/actions/workflows/ansible-debian-check.yml"><img
src="https://github.com/willshersystems/ansible-sshd/actions/workflows/ansible-debian-check.yml/badge.svg"
alt="Run tests on Debian" /></a></li>
</ul></li>
<li>EL 6, 7, 8, 9, 10 derived distributions
<ul>
<li><a
href="https://github.com/willshersystems/ansible-sshd/actions/workflows/ansible-centos-check.yml"><img
src="https://github.com/willshersystems/ansible-sshd/actions/workflows/ansible-centos-check.yml/badge.svg"
alt="Run tests on CentOS" /></a></li>
</ul></li>
<li>All Fedora
<ul>
<li><a
href="https://github.com/willshersystems/ansible-sshd/actions/workflows/ansible-fedora.yml"><img
src="https://github.com/willshersystems/ansible-sshd/actions/workflows/ansible-fedora.yml/badge.svg"
alt="Run tests on Fedora latest" /></a></li>
</ul></li>
<li>Latest Alpine
<ul>
<li><a
href="https://github.com/willshersystems/ansible-sshd/actions/workflows/ansible-alpine.yml"><img
src="https://github.com/willshersystems/ansible-sshd/actions/workflows/ansible-alpine.yml/badge.svg"
alt="Run tests on Alpine" /></a></li>
</ul></li>
<li>FreeBSD 10.1</li>
<li>OpenBSD 6.0</li>
<li>AIX 7.1, 7.2</li>
<li>OpenWrt 21.03</li>
</ul>
<p>It will likely work on other flavours and more direct support via
suitable <a href="vars/">vars/</a> files is welcome.</p>
<h2 id="optional-requirements">Optional requirements</h2>
<p>If you want to use advanced functionality of this role that can
configure firewall and selinux for you, which is mostly useful when
custom port is used, the role requires additional collections which are
specified in <code>meta/collection-requirements.yml</code>. These are
not automatically installed. If you want to manage
<code>rpm-ostree</code> systems, additional collections are required.
You must install them like this:</p>
<div class="sourceCode" id="cb1"><pre
class="sourceCode bash"><code class="sourceCode bash"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="ex">ansible-galaxy</span> install <span class="at">-vv</span> <span class="at">-r</span> meta/collection-requirements.yml</span></code></pre></div>
<p>For more information, see <code>sshd_manage_firewall</code> and
<code>sshd_manage_selinux</code> options below, and the
<code>rpm-ostree</code> section. This additional functionality is
supported only on Red Hat based Linux.</p>
<h1 id="role-variables">Role variables</h1>
<h2 id="primary-role-variables">Primary role variables</h2>
<p>Unconfigured, this role will provide a <code>sshd_config</code> that
matches the OS default, minus the comments and in a different order.</p>
<h3 id="sshd_enable">sshd_enable</h3>
<p>If set to <em>false</em>, the role will be completely disabled.
Defaults to <em>true</em>.</p>
<h3 id="sshd_skip_defaults">sshd_skip_defaults</h3>
<p>If set to <em>true</em>, don't apply default values. This means that
you must have a complete set of configuration defaults via either the
<code>sshd</code> dict, or <code>sshd_Key</code> variables. Defaults to
<em>false</em> unless <code>sshd_config_namespace</code> is set or
<code>sshd_config_file</code> points to a drop-in directory to avoid
recursive include.</p>
<h3 id="sshd_manage_service">sshd_manage_service</h3>
<p>If set to <em>false</em>, the service/daemon won't be
<strong>managed</strong> at all, i.e. will not try to enable on boot or
start or reload the service. Defaults to <em>true</em> unless: Running
inside a docker container (it is assumed ansible is used during build
phase) or AIX (Ansible <code>service</code> module does not currently
support <code>enabled</code> for AIX)</p>
<h3 id="sshd_allow_reload">sshd_allow_reload</h3>
<p>If set to <em>false</em>, a reload of sshd won't happen on change.
This can help with troubleshooting. You'll need to manually reload sshd
if you want to apply the changed configuration. Defaults to the same
value as <code>sshd_manage_service</code>. (Except on AIX, where
<code>sshd_manage_service</code> is default <em>false</em>, but
<code>sshd_allow_reload</code> is default <em>true</em>)</p>
<h3 id="sshd_install_service">sshd_install_service</h3>
<p>If set to <em>true</em>, the role will install service files for the
ssh service. Defaults to <em>false</em>.</p>
<p>The templates for the service files to be used are pointed to by the
variables</p>
<ul>
<li><code>sshd_service_template_service</code>
(<strong>default</strong>: <code>templates/sshd.service.j2</code>)</li>
<li><code>sshd_service_template_at_service</code>
(<strong>default</strong>: <code>templates/sshd@.service.j2</code>)</li>
<li><code>sshd_service_template_socket</code> (<strong>default</strong>:
<code>templates/sshd.socket.j2</code>)</li>
</ul>
<p>Using these variables, you can use your own custom templates. With
the above default templates, the name of the installed ssh service will
be provided by the <code>sshd_service</code> variable.</p>
<h3 id="sshd_manage_firewall">sshd_manage_firewall</h3>
<p>If set to <em>true</em>, the SSH port(s) will be opened in firewall.
Note, this works only on Red Hat based OS. The default is
<em>false</em>.</p>
<p>NOTE: <code>sshd_manage_firewall</code> is limited to <em>adding</em>
ports. It cannot be used for <em>removing</em> ports. If you want to
remove ports, you will need to use the firewall system role
directly.</p>
<h3 id="sshd_manage_selinux">sshd_manage_selinux</h3>
<p>If set to <em>true</em>, the selinux will be configured to allow sshd
listening on the given SSH port(s). Note, this works only on Red Hat
based OS. The default is <em>false</em>.</p>
<p>NOTE: <code>sshd_manage_selinux</code> is limited to <em>adding</em>
policy. It cannot be used for <em>removing</em> policy. If you want to
remove ports, you will need to use the selinux system role directly.</p>
<h3 id="sshd">sshd</h3>
<p>A dict containing configuration. e.g.</p>
<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="fu">sshd</span><span class="kw">:</span></span>
<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">Compression</span><span class="kw">:</span><span class="at"> delayed</span></span>
<span id="cb2-3"><a href="#cb2-3" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">ListenAddress</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="kw">-</span><span class="at"> </span><span class="fl">0.0.0.0</span></span></code></pre></div>
<h3 id="sshd_optionname">sshd_<code>&lt;OptionName&gt;</code></h3>
<p>Simple variables can be used rather than a dict. Simple values
override dict values. e.g.:</p>
<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="fu">sshd_Compression</span><span class="kw">:</span><span class="at"> </span><span class="ch">off</span></span></code></pre></div>
<p>In all cases, booleans are correctly rendered as yes and no in sshd
configuration. Lists can be used for multiline configuration items.
e.g.</p>
<div class="sourceCode" id="cb4"><pre
class="sourceCode yaml"><code class="sourceCode yaml"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="fu">sshd_ListenAddress</span><span class="kw">:</span></span>
<span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="fl">0.0.0.0</span></span>
<span id="cb4-3"><a href="#cb4-3" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="st">&#39;::&#39;</span></span></code></pre></div>
<p>Renders as:</p>
<pre class="text"><code>ListenAddress 0.0.0.0
ListenAddress ::</code></pre>
<h3 id="sshd_match-sshd_match_1-through-sshd_match_9">sshd_match,
sshd_match_1 through sshd_match_9</h3>
<p>A list of dicts or just a dict for a Match section. Note, that these
variables do not override match blocks as defined in the
<code>sshd</code> dict. All of the sources will be reflected in the
resulting configuration file. The use of <code>sshd_match_*</code>
variant is deprecated and no longer recommended.</p>
<h3 id="sshd_backup">sshd_backup</h3>
<p>When set to <em>false</em>, the original <code>sshd_config</code>
file is not backed up. Default is <em>true</em>.</p>
<h3 id="sshd_sysconfig">sshd_sysconfig</h3>
<p>On RHEL-based systems, sysconfig is used for configuring more details
of sshd service. If set to <em>true</em>, this role will manage also the
<code>/etc/sysconfig/sshd</code> configuration file based on the
following configurations. Default is <em>false</em>.</p>
<h3
id="sshd_sysconfig_override_crypto_policy">sshd_sysconfig_override_crypto_policy</h3>
<p>In RHEL8-based systems, this can be used to override system-wide
crypto policy by setting to <em>true</em>. Without this option, changes
to ciphers, MACs, public key algorithms will have no effect on the
resulting service in RHEL8. Defaults to <em>false</em>.</p>
<h3
id="sshd_sysconfig_use_strong_rng">sshd_sysconfig_use_strong_rng</h3>
<p>In RHEL-based systems (before RHEL9), this can be used to force sshd
to reseed openssl random number generator with the given amount of bytes
as an argument. The default is <em>0</em>, which disables this
functionality. It is not recommended to turn this on if the system does
not have hardware random number generator.</p>
<h3 id="sshd_config_file">sshd_config_file</h3>
<p>The path where the openssh configuration produced by this role should
be saved. This is useful mostly when generating configuration snippets
to Include from drop-in directory (default in Fedora and RHEL9).</p>
<p>When this path points to a drop-in directory (like
<code>/etc/ssh/sshd_config.d/00-custom.conf</code>), the main
configuration file (defined with the variable
<code>sshd_main_config_file</code>) is checked to contain a proper
<code>Include</code> directive.</p>
<h3 id="sshd_main_config_file">sshd_main_config_file</h3>
<p>When the system is using drop-in directory, this option can be used
to set a path to the main configuration file and let you configure only
the drop-in configuration file using <code>sshd_config_file</code>. This
is useful in cases when you need to configure second independent sshd
service with different configuration file. This is also the file used in
the service file.</p>
<p>On systems without drop-in directory, it defaults to
<code>None</code>. Otherwise it defaults to
<code>/etc/ssh/sshd_config</code>. When the
<code>sshd_config_file</code> is set outside of the drop in directory
(its parent directory is not <code>sshd_main_config_file</code> ~ '.d'),
this variable is ignored.</p>
<h3 id="sshd_config_namespace">sshd_config_namespace</h3>
<p>By default (<em>null</em>), the role defines whole content of the
configuration file including system defaults. You can use this variable
to invoke this role from other roles or from multiple places in a single
playbook as an alternative to using a drop-in directory. The
<code>sshd_skip_defaults</code> is ignored and no system defaults are
used in this case.</p>
<p>When this variable is set, the role places the configuration that you
specify to configuration snippets in a existing configuration file under
the given namespace. You need to select different namespaces when
invoking the role several times.</p>
<p>Note that limitations of the openssh configuration file still apply.
For example, only the first option specified in a configuration file is
effective for most of the variables.</p>
<p>Technically, the role places snippets in <code>Match all</code>
blocks, unless they contain other match blocks, to ensure they are
applied regardless of the previous match blocks in the existing
configuration file. This allows configuring any non-conflicting options
from different roles invocations.</p>
<h3
id="sshd_config_owner-sshd_config_group-sshd_config_mode">sshd_config_owner,
sshd_config_group, sshd_config_mode</h3>
<p>Use these variables to set the ownership and permissions for the
openssh configuration file that this role produces.</p>
<h3 id="sshd_verify_hostkeys">sshd_verify_hostkeys</h3>
<p>By default (<em>auto</em>), this list contains all the host keys that
are present in the produced configuration file. If there are none, the
OpenSSH default list will be used after excluding non-FIPS approved keys
in FIPS mode. The paths are checked for presence and new keys are
generated if they are missing. Additionally, permissions and file owners
are set to sane defaults. This is useful if the role is used in
deployment stage to make sure the service is able to start on the first
attempt.</p>
<p>To disable this check, set this to empty list.</p>
<h3
id="sshd_hostkey_owner-sshd_hostkey_group-sshd_hostkey_mode">sshd_hostkey_owner,
sshd_hostkey_group, sshd_hostkey_mode</h3>
<p>Use these variables to set the ownership and permissions for the host
keys from the above list.</p>
<h2 id="secondary-role-variables">Secondary role variables</h2>
<p>These variables are used by the role internals and can be used to
override the defaults that correspond to each supported platform. They
are not tested and generally are not needed as the role will determine
them from the OS type.</p>
<h3 id="sshd_packages">sshd_packages</h3>
<p>Use this variable to override the default list of packages to
install.</p>
<h3 id="sshd_binary">sshd_binary</h3>
<p>The path to the openssh executable</p>
<h3 id="sshd_service">sshd_service</h3>
<p>The name of the openssh service. By default, this variable contains
the name of the ssh service that the target platform uses. But it can
also be used to set the name of the custom ssh service when the
<code>sshd_install_service</code> variable is used.</p>
<h3 id="sshd_sftp_server">sshd_sftp_server</h3>
<p>Default path to the sftp server binary.</p>
<h2 id="variables-exported-by-the-role">Variables Exported by the
Role</h2>
<h3 id="sshd_has_run">sshd_has_run</h3>
<p>This variable is set to <em>true</em> after the role was successfully
executed.</p>
<h1 id="configure-ssh-certificate-authentication">Configure SSH
certificate authentication</h1>
<p>To configure SSH certificate authentication on your SSH server, you
need to provide at least the trusted user CA key, which will be used to
validate client certificates against. This is done with the
<code>sshd_trusted_user_ca_keys_list</code> variable.</p>
<p>If you need to map some of the authorized principals to system users,
you can do that using the <code>sshd_principals</code> variable.</p>
<h2 id="additional-variables">Additional variables</h2>
<h3
id="sshd_trusted_user_ca_keys_list">sshd_trusted_user_ca_keys_list</h3>
<p>List of the trusted user CA public keys in OpenSSH (one-line) format
(mandatory).</p>
<h3
id="sshd_trustedusercakeys_directory_owner-shsd_trustedusercakeys_directory_group-sshd_trustedusercakeys_directory_mode">sshd_trustedusercakeys_directory_owner,
shsd_trustedusercakeys_directory_group,
sshd_trustedusercakeys_directory_mode</h3>
<p>Use these variables to set the ownership and permissions for the
Trusted User CA Keys directory. Defaults are respectively <em>root</em>,
<em>root</em> and <em>0755</em>.</p>
<h3
id="sshd_trustedusercakeys_file_owner-shsd_trustedusercakeys_file_group-sshd_trustedusercakeys_file_mode">sshd_trustedusercakeys_file_owner,
shsd_trustedusercakeys_file_group, sshd_trustedusercakeys_file_mode</h3>
<p>Use these variables to set the ownership and permissions for the
Trusted User CA Keys file. Defaults are respectively <em>root</em>,
<em>root</em> and <em>0640</em>.</p>
<h3 id="sshd_principals">sshd_principals</h3>
<p>A dict containing principals for users in the os (optional). e.g.</p>
<div class="sourceCode" id="cb6"><pre
class="sourceCode yaml"><code class="sourceCode yaml"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a><span class="fu">sshd_principals</span><span class="kw">:</span></span>
<span id="cb6-2"><a href="#cb6-2" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">admin</span><span class="kw">:</span></span>
<span id="cb6-3"><a href="#cb6-3" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> frontend-admin</span></span>
<span id="cb6-4"><a href="#cb6-4" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> backend-admin</span></span>
<span id="cb6-5"><a href="#cb6-5" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">somelinuxuser</span><span class="kw">:</span></span>
<span id="cb6-6"><a href="#cb6-6" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> some-principal-defined-in-certificate</span></span></code></pre></div>
<h3
id="sshd_authorizedprincipals_directory_owner-shsd_authorizedprincipals_directory_group-sshd_authorizedprincipals_directory_mode">sshd_authorizedprincipals_directory_owner,
shsd_authorizedprincipals_directory_group,
sshd_authorizedprincipals_directory_mode</h3>
<p>Use these variables to set the ownership and permissions for the
Authorized Principals directory. Defaults are respectively
<em>root</em>, <em>root</em> and <em>0755</em>.</p>
<h3
id="sshd_authorizedprincipals_file_owner-shsd_authorizedprincipals_file_group-sshd_authorizedprincipals_file_mode">sshd_authorizedprincipals_file_owner,
shsd_authorizedprincipals_file_group,
sshd_authorizedprincipals_file_mode</h3>
<p>Use these variables to set the ownership and permissions for the
Authorized Principals file. Defaults are respectively <em>root</em>,
<em>root</em> and <em>0644</em>.</p>
<h2 id="additional-configuration">Additional configuration</h2>
<p>The SSH server needs this information stored in files so in addition
to the above variables, respective configuration options
<code>TrustedUserCAKeys</code> (mandatory) and
<code>AuthorizedPrincipalsFile</code> (optional) need to be present the
<code>sshd</code> dictionary when invoking the role. For example:</p>
<div class="sourceCode" id="cb7"><pre
class="sourceCode yaml"><code class="sourceCode yaml"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a><span class="fu">sshd</span><span class="kw">:</span></span>
<span id="cb7-2"><a href="#cb7-2" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">TrustedUserCAKeys</span><span class="kw">:</span><span class="at"> /etc/ssh/path-to-trusted-user-ca-keys/trusted-user-ca-keys.pub</span></span>
<span id="cb7-3"><a href="#cb7-3" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">AuthorizedPrincipalsFile</span><span class="kw">:</span><span class="at"> </span><span class="st">&quot;/etc/ssh/path-to-auth-principals/auth_principals/%u&quot;</span></span></code></pre></div>
<p>To learn more about SSH Certificates, here is a <a
href="https://en.wikibooks.org/wiki/OpenSSH/Cookbook/Certificate-based_Authentication">nice
tutorial to pure SSH certificates, from wikibooks</a>.</p>
<p>To understand principals and to set up SSH certificates with Vault,
this is a <a
href="https://www.hashicorp.com/blog/managing-ssh-access-at-scale-with-hashicorp-vault">well-explained
tutorial from Hashicorp</a>.</p>
<h1 id="dependencies">Dependencies</h1>
<p>None</p>
<p>For tests, the <code>ansible.posix</code> collection is required for
the <code>mount</code> role to emulate FIPS mode.</p>
<h1 id="example-playbook">Example Playbook</h1>
<p><strong>DANGER!</strong> This example is to show the range of
configuration this role provides. Running it will likely break your SSH
access to the server!</p>
<div class="sourceCode" id="cb8"><pre
class="sourceCode yaml"><code class="sourceCode yaml"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a><span class="pp">---</span></span>
<span id="cb8-2"><a href="#cb8-2" 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="cb8-3"><a href="#cb8-3" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">vars</span><span class="kw">:</span></span>
<span id="cb8-4"><a href="#cb8-4" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">sshd_skip_defaults</span><span class="kw">:</span><span class="at"> </span><span class="ch">true</span></span>
<span id="cb8-5"><a href="#cb8-5" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">sshd</span><span class="kw">:</span></span>
<span id="cb8-6"><a href="#cb8-6" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">Compression</span><span class="kw">:</span><span class="at"> </span><span class="ch">true</span></span>
<span id="cb8-7"><a href="#cb8-7" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">ListenAddress</span><span class="kw">:</span></span>
<span id="cb8-8"><a href="#cb8-8" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="st">&quot;0.0.0.0&quot;</span></span>
<span id="cb8-9"><a href="#cb8-9" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="st">&quot;::&quot;</span></span>
<span id="cb8-10"><a href="#cb8-10" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">GSSAPIAuthentication</span><span class="kw">:</span><span class="at"> </span><span class="ch">false</span></span>
<span id="cb8-11"><a href="#cb8-11" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">Match</span><span class="kw">:</span></span>
<span id="cb8-12"><a href="#cb8-12" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="fu">Condition</span><span class="kw">:</span><span class="at"> </span><span class="st">&quot;Group user&quot;</span></span>
<span id="cb8-13"><a href="#cb8-13" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">GSSAPIAuthentication</span><span class="kw">:</span><span class="at"> </span><span class="ch">true</span></span>
<span id="cb8-14"><a href="#cb8-14" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">sshd_UsePrivilegeSeparation</span><span class="kw">:</span><span class="at"> </span><span class="ch">false</span></span>
<span id="cb8-15"><a href="#cb8-15" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">sshd_match</span><span class="kw">:</span></span>
<span id="cb8-16"><a href="#cb8-16" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="fu">Condition</span><span class="kw">:</span><span class="at"> </span><span class="st">&quot;Group xusers&quot;</span></span>
<span id="cb8-17"><a href="#cb8-17" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">X11Forwarding</span><span class="kw">:</span><span class="at"> </span><span class="ch">true</span></span>
<span id="cb8-18"><a href="#cb8-18" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">roles</span><span class="kw">:</span></span>
<span id="cb8-19"><a href="#cb8-19" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="fu">role</span><span class="kw">:</span><span class="at"> willshersystems.sshd</span></span></code></pre></div>
<p>Results in:</p>
<pre class="text"><code># Ansible managed: ...
Compression yes
GSSAPIAuthentication no
UsePrivilegeSeparation no
Match Group user
GSSAPIAuthentication yes
Match Group xusers
X11Forwarding yes</code></pre>
<p>Since Ansible 2.4, the role can be invoked using
<code>include_role</code> keyword, for example:</p>
<div class="sourceCode" id="cb10"><pre
class="sourceCode yaml"><code class="sourceCode yaml"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a><span class="pp">---</span></span>
<span id="cb10-2"><a href="#cb10-2" 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="cb10-3"><a href="#cb10-3" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">become</span><span class="kw">:</span><span class="at"> </span><span class="ch">true</span></span>
<span id="cb10-4"><a href="#cb10-4" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">tasks</span><span class="kw">:</span></span>
<span id="cb10-5"><a href="#cb10-5" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="fu">name</span><span class="kw">:</span><span class="at"> </span><span class="st">&quot;Configure sshd&quot;</span></span>
<span id="cb10-6"><a href="#cb10-6" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">include_role</span><span class="kw">:</span></span>
<span id="cb10-7"><a href="#cb10-7" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">name</span><span class="kw">:</span><span class="at"> willshersystems.sshd</span></span>
<span id="cb10-8"><a href="#cb10-8" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">vars</span><span class="kw">:</span></span>
<span id="cb10-9"><a href="#cb10-9" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">sshd_skip_defaults</span><span class="kw">:</span><span class="at"> </span><span class="ch">true</span></span>
<span id="cb10-10"><a href="#cb10-10" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">sshd</span><span class="kw">:</span></span>
<span id="cb10-11"><a href="#cb10-11" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">Compression</span><span class="kw">:</span><span class="at"> </span><span class="ch">true</span></span>
<span id="cb10-12"><a href="#cb10-12" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">ListenAddress</span><span class="kw">:</span></span>
<span id="cb10-13"><a href="#cb10-13" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="st">&quot;0.0.0.0&quot;</span></span>
<span id="cb10-14"><a href="#cb10-14" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="st">&quot;::&quot;</span></span>
<span id="cb10-15"><a href="#cb10-15" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">GSSAPIAuthentication</span><span class="kw">:</span><span class="at"> </span><span class="ch">false</span></span>
<span id="cb10-16"><a href="#cb10-16" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">Match</span><span class="kw">:</span></span>
<span id="cb10-17"><a href="#cb10-17" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="fu">Condition</span><span class="kw">:</span><span class="at"> </span><span class="st">&quot;Group user&quot;</span></span>
<span id="cb10-18"><a href="#cb10-18" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">GSSAPIAuthentication</span><span class="kw">:</span><span class="at"> </span><span class="ch">true</span></span>
<span id="cb10-19"><a href="#cb10-19" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">sshd_UsePrivilegeSeparation</span><span class="kw">:</span><span class="at"> </span><span class="ch">false</span></span>
<span id="cb10-20"><a href="#cb10-20" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">sshd_match</span><span class="kw">:</span></span>
<span id="cb10-21"><a href="#cb10-21" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="fu">Condition</span><span class="kw">:</span><span class="at"> </span><span class="st">&quot;Group xusers&quot;</span></span>
<span id="cb10-22"><a href="#cb10-22" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">X11Forwarding</span><span class="kw">:</span><span class="at"> </span><span class="ch">true</span></span></code></pre></div>
<p>You can just add a configuration snippet with the
<code>sshd_config_namespace</code> option:</p>
<div class="sourceCode" id="cb11"><pre
class="sourceCode yaml"><code class="sourceCode yaml"><span id="cb11-1"><a href="#cb11-1" aria-hidden="true" tabindex="-1"></a><span class="pp">---</span></span>
<span id="cb11-2"><a href="#cb11-2" 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="cb11-3"><a href="#cb11-3" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">tasks</span><span class="kw">:</span></span>
<span id="cb11-4"><a href="#cb11-4" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="kw">-</span><span class="at"> </span><span class="fu">name</span><span class="kw">:</span><span class="at"> Configure sshd to accept some useful environment variables</span></span>
<span id="cb11-5"><a href="#cb11-5" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">include_role</span><span class="kw">:</span></span>
<span id="cb11-6"><a href="#cb11-6" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">name</span><span class="kw">:</span><span class="at"> willshersystems.sshd</span></span>
<span id="cb11-7"><a href="#cb11-7" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">vars</span><span class="kw">:</span></span>
<span id="cb11-8"><a href="#cb11-8" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">sshd_config_namespace</span><span class="kw">:</span><span class="at"> accept-env</span></span>
<span id="cb11-9"><a href="#cb11-9" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">sshd</span><span class="kw">:</span></span>
<span id="cb11-10"><a href="#cb11-10" aria-hidden="true" tabindex="-1"></a><span class="co"> # there are some handy environment variables to accept</span></span>
<span id="cb11-11"><a href="#cb11-11" aria-hidden="true" tabindex="-1"></a><span class="at"> </span><span class="fu">AcceptEnv</span><span class="kw">:</span></span>
<span id="cb11-12"><a href="#cb11-12" aria-hidden="true" tabindex="-1"></a><span class="at"> LANG</span></span>
<span id="cb11-13"><a href="#cb11-13" aria-hidden="true" tabindex="-1"></a><span class="at"> LS_COLORS</span></span>
<span id="cb11-14"><a href="#cb11-14" aria-hidden="true" tabindex="-1"></a><span class="at"> EDITOR</span></span></code></pre></div>
<p>The following snippet will be added to the default configuration file
(if not yet present):</p>
<pre class="text"><code># BEGIN sshd system role managed block: namespace accept-env
Match all
AcceptEnv LANG LS_COLORS EDITOR
# END sshd system role managed block: namespace accept-env</code></pre>
<p>More example playbooks can be found in <a
href="examples/"><code>examples/</code></a> directory.</p>
<h1 id="template-generation">Template Generation</h1>
<p>The <a
href="templates/sshd_config.j2"><code>sshd_config.j2</code></a> and <a
href="templates/sshd_config_snippet.j2"><code>sshd_config_snippet.j2</code></a>
templates are programmatically generated by the scripts in meta. New
options should be added to the <code>options_body</code> and/or
<code>options_match</code>.</p>
<p>To regenerate the templates, from within the <code>meta/</code>
directory run: <code>./make_option_lists</code></p>
<h1 id="rpm-ostree">rpm-ostree</h1>
<p>See README-ostree.md</p>
<h1 id="license">License</h1>
<p>LGPLv3</p>
<h1 id="authors">Authors</h1>
<p>Matt Willsher <a
href="mailto:matt@willsher.systems">matt@willsher.systems</a></p>
<p>© 2014,2015 Willsher Systems Ltd.</p>
<p>Jakub Jelen <a
href="mailto:jjelen@redhat.com">jjelen@redhat.com</a></p>
<p>© 2020 - 2022 Red Hat, Inc.</p>
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