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<refentry id="systemd.system-credentials" xmlns:xi="http://www.w3.org/2001/XInclude">

  <refentryinfo>
    <title>systemd.system-credentials</title>
    <productname>systemd</productname>
  </refentryinfo>

  <refmeta>
    <refentrytitle>systemd.system-credentials</refentrytitle>
    <manvolnum>7</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>systemd.system-credentials</refname>
    <refpurpose>System Credentials</refpurpose>
  </refnamediv>

  <refsect1>
    <title>Description</title>

    <para><ulink url="https://systemd.io/CREDENTIALS">System and Service Credentials</ulink> are data objects
    that may be passed into booted systems or system services as they are invoked. They can be acquired from
    various external sources, and propagated into the system and from there into system services. Credentials
    may optionally be encrypted with a machine-specific key and/or locked to the local TPM2 device, and are
    only decrypted when the consuming service is invoked.</para>

    <para>System credentials may be used to provision and configure various aspects of the system. Depending
    on the consuming component credentials are only used on initial invocations or are needed for all
    invocations.</para>

    <para>Credentials may be used for any kind of data, binary or text, and may carry passwords, secrets,
    certificates, cryptographic key material, identity information, configuration, and more.</para>
  </refsect1>

  <refsect1>
    <title>Well known system credentials</title>

    <variablelist class='system-credentials'>
      <varlistentry>
        <term><varname>firstboot.keymap</varname></term>
        <listitem>
          <para>The console key mapping to set (e.g. <literal>de</literal>).  Read by
          <citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
          and only honoured if no console keymap has been configured before.</para>

        <xi:include href="version-info.xml" xpointer="v252"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>firstboot.locale</varname></term>
        <term><varname>firstboot.locale-messages</varname></term>
        <listitem>
          <para>The system locale to set (e.g. <literal>de_DE.UTF-8</literal>). Read by
          <citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
          and only honoured if no locale has been configured before. <varname>firstboot.locale</varname> sets
          <literal>LANG</literal>, while <varname>firstboot.locale-message</varname> sets
          <literal>LC_MESSAGES</literal>.</para>

        <xi:include href="version-info.xml" xpointer="v252"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>firstboot.timezone</varname></term>
        <listitem>
          <para>The system timezone to set (e.g. <literal>Europe/Berlin</literal>).  Read by
          <citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
          and only honoured if no system timezone has been configured before.</para>

        <xi:include href="version-info.xml" xpointer="v252"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>login.issue</varname></term>
        <listitem>
          <para>The data of this credential is written to
          <filename>/etc/issue.d/50-provision.conf</filename>, if the file doesn't exist yet.
          <citerefentry project='man-pages'><refentrytitle>agetty</refentrytitle><manvolnum>8</manvolnum></citerefentry>
          reads this file and shows its contents at the login prompt of terminal logins. See
          <citerefentry project='man-pages'><refentrytitle>issue</refentrytitle><manvolnum>5</manvolnum></citerefentry>
          for details.</para>

          <para>Consumed by <filename>/usr/lib/tmpfiles.d/provision.conf</filename>, see
          <citerefentry><refentrytitle>tmpfiles.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>

          <xi:include href="version-info.xml" xpointer="v252"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>login.motd</varname></term>
        <listitem>
          <para>The data of this credential is written to <filename>/etc/motd.d/50-provision.conf</filename>,
          if the file doesn't exist yet.
          <citerefentry project='man-pages'><refentrytitle>pam_motd</refentrytitle><manvolnum>8</manvolnum></citerefentry>
          reads this file and shows its contents as "message of the day" during terminal logins. See
          <citerefentry project='man-pages'><refentrytitle>motd</refentrytitle><manvolnum>5</manvolnum></citerefentry>
          for details.</para>

          <para>Consumed by <filename>/usr/lib/tmpfiles.d/provision.conf</filename>, see
          <citerefentry><refentrytitle>tmpfiles.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>

          <xi:include href="version-info.xml" xpointer="v252"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>network.hosts</varname></term>
        <listitem>
          <para>The data of this credential is written to <filename>/etc/hosts</filename>, if the file
          doesn't exist yet. See
          <citerefentry project='man-pages'><refentrytitle>hosts</refentrytitle><manvolnum>5</manvolnum></citerefentry>
          for details.</para>

          <para>Consumed by <filename>/usr/lib/tmpfiles.d/provision.conf</filename>, see
          <citerefentry><refentrytitle>tmpfiles.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>

          <xi:include href="version-info.xml" xpointer="v252"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>network.dns</varname></term>
        <term><varname>network.search_domains</varname></term>
        <listitem>
          <para>DNS server information and search domains. Read by
          <citerefentry><refentrytitle>systemd-resolved.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>

          <xi:include href="version-info.xml" xpointer="v253"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>network.conf.*</varname></term>
        <term><varname>network.link.*</varname></term>
        <term><varname>network.netdev.*</varname></term>
        <term><varname>network.network.*</varname></term>
        <listitem>
          <para>Configures network devices. Read by
          <citerefentry><refentrytitle>systemd-network-generator.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
          These credentials should contain valid
          <citerefentry><refentrytitle>networkd.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
          <citerefentry><refentrytitle>systemd.link</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
          <citerefentry><refentrytitle>systemd.netdev</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
          <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>
          configuration data. From each matching credential a separate file is created. Example: the contents
          of a credential <filename>network.link.50-foobar</filename> will be copied into a file
          <filename>50-foobar.link</filename>.</para>

          <para>Note that the resulting files are created world-readable, it's hence recommended to not include
          secrets in these credentials, but supply them via separate credentials directly to
          <filename>systemd-networkd.service</filename>, e.g. <varname>network.wireguard.*</varname>
          as described below.</para>

          <xi:include href="version-info.xml" xpointer="v256"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>network.wireguard.*</varname></term>
        <listitem>
          <para>Configures secrets for WireGuard netdevs. Read by
          <citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
          For more information, refer to the <option>[WireGuard]</option> section of
          <citerefentry><refentrytitle>systemd.netdev</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
          </para>

          <xi:include href="version-info.xml" xpointer="v256"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>passwd.hashed-password.root</varname></term>
        <term><varname>passwd.plaintext-password.root</varname></term>
        <listitem>
          <para>May contain the password (either in UNIX hashed format, or in plaintext) for the root users.
          Read by both
          <citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
          and
          <citerefentry><refentrytitle>systemd-sysusers</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
          and only honoured if no root password has been configured before.</para>

          <xi:include href="version-info.xml" xpointer="v252"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>passwd.shell.root</varname></term>
        <listitem>
          <para>The path to the shell program (e.g. <literal>/bin/bash</literal>) for the root user.  Read by
          both
          <citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
          and
          <citerefentry><refentrytitle>systemd-sysusers</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
          and only honoured if no root shell has been configured before.</para>

        <xi:include href="version-info.xml" xpointer="v252"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>ssh.authorized_keys.root</varname></term>
        <listitem>
          <para>The data of this credential is written to <filename>/root/.ssh/authorized_keys</filename>, if
          the file doesn't exist yet. This allows provisioning SSH access for the system's root user.</para>

          <para>Consumed by <filename>/usr/lib/tmpfiles.d/provision.conf</filename>, see
          <citerefentry><refentrytitle>tmpfiles.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>

          <xi:include href="version-info.xml" xpointer="v252"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>ssh.listen</varname></term>
        <listitem>
          <para>May be used to configure SSH sockets the system shall be reachable on. See
          <citerefentry><refentrytitle>systemd-ssh-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
          for details.</para>

          <xi:include href="version-info.xml" xpointer="v256"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>sysusers.extra</varname></term>
        <listitem>
          <para>Additional
          <citerefentry><refentrytitle>sysusers.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>
          lines to process during boot.</para>

          <xi:include href="version-info.xml" xpointer="v252"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>sysctl.extra</varname></term>
        <listitem>
          <para>Additional
          <citerefentry><refentrytitle>sysctl.d</refentrytitle><manvolnum>5</manvolnum></citerefentry> lines
          to process during boot.</para>

          <xi:include href="version-info.xml" xpointer="v252"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>tmpfiles.extra</varname></term>
        <listitem>
          <para>Additional
          <citerefentry><refentrytitle>tmpfiles.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>
          lines to process during boot.</para>

          <xi:include href="version-info.xml" xpointer="v252"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>fstab.extra</varname></term>

        <listitem>
          <para>Additional mounts to establish at boot. For details, see
          <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>

          <xi:include href="version-info.xml" xpointer="v254"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>vconsole.keymap</varname></term>
        <term><varname>vconsole.keymap_toggle</varname></term>
        <term><varname>vconsole.font</varname></term>
        <term><varname>vconsole.font_map</varname></term>
        <term><varname>vconsole.font_unimap</varname></term>
        <listitem>
          <para>Console settings to apply, see
          <citerefentry><refentrytitle>systemd-vconsole-setup.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> for details.</para>

          <xi:include href="version-info.xml" xpointer="v253"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>getty.ttys.serial</varname></term>
        <term><varname>getty.ttys.container</varname></term>

        <listitem><para>Used for spawning additional login prompts, see
        <citerefentry><refentrytitle>systemd-getty-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry> for details.</para>

        <xi:include href="version-info.xml" xpointer="v254"/></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>journal.forward_to_socket</varname></term>
        <listitem>
          <para>Used by
          <citerefentry><refentrytitle>systemd-journald</refentrytitle><manvolnum>8</manvolnum></citerefentry>
          to determine where to forward log messages for socket forwarding, see
          <citerefentry><refentrytitle>journald.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry> for details.</para>

          <xi:include href="version-info.xml" xpointer="v256"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>journal.storage</varname></term>
        <listitem>
          <para>Used by
          <citerefentry><refentrytitle>systemd-journald</refentrytitle><manvolnum>8</manvolnum></citerefentry>
          to determine where to store journal files, see
          <citerefentry><refentrytitle>journald.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry> for details.</para>

          <xi:include href="version-info.xml" xpointer="v256"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>vmm.notify_socket</varname></term>
        <listitem>
          <para>Configures an
          <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>
          compatible <constant>AF_VSOCK</constant> socket the service manager will report status information,
          ready notification and exit status on. For details see
          <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>

          <xi:include href="version-info.xml" xpointer="v253"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>system.machine_id</varname></term>
        <listitem>
          <para>Takes a 128bit ID to initialize the machine ID from (if it is not set yet). Interpreted by
          the service manager (PID 1). For details see
          <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>

          <xi:include href="version-info.xml" xpointer="v254"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>system.hostname</varname></term>
        <listitem>
          <para>Accepts a (transient) hostname to configure during early boot. The static hostname specified
            in <filename>/etc/hostname</filename>, if configured, takes precedence over this setting.
            Interpreted by the service manager (PID 1). For details see
            <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>

          <xi:include href="version-info.xml" xpointer="v254"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>home.create.*</varname></term>
        <listitem>
          <para>Creates a home area for the specified user with the user record data passed in. For details see
          <citerefentry><refentrytitle>homectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>

          <xi:include href="version-info.xml" xpointer="v256"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>cryptsetup.passphrase</varname></term>
        <term><varname>cryptsetup.tpm2-pin</varname></term>
        <term><varname>cryptsetup.fido2-pin</varname></term>
        <term><varname>cryptsetup.pkcs11-pin</varname></term>
        <term><varname>cryptsetup.luks2-pin</varname></term>
        <listitem>
          <para>Specifies the passphrase/PINs to use for unlock encrypted storage volumes. For details see
          <citerefentry><refentrytitle>systemd-cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>

          <xi:include href="version-info.xml" xpointer="v256"/>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>systemd.extra-unit.*</varname></term>
        <term><varname>systemd.unit-dropin.*</varname></term>

        <listitem><para>These credentials specify extra units and drop-ins to add to the system. For details
        see <citerefentry><refentrytitle>systemd-debug-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>

        <xi:include href="version-info.xml" xpointer="v256"/></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>udev.conf.*</varname></term>
        <term><varname>udev.rules.*</varname></term>

        <listitem>
          <para>Configures udev configuration file and udev rules. Read by
          <filename>systemd-udev-load-credentials.service</filename>, which invokes
          <command>udevadm control --load-credentials</command>. These credentials directly translate to a
          matching
          <citerefentry><refentrytitle>udev.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry> or
          <citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry> rules
          file. Example: the contents of a credential
          <filename>udev.conf.50-foobar</filename> will be copied into a file
          <filename>/run/udev/udev.conf.d/50-foobar.conf</filename>, and
          <filename>udev.rules.50-foobar</filename> will be copied into a file
          <filename>/run/udev/rules.d/50-foobar.rules</filename>. See
          <citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
          <citerefentry><refentrytitle>udev.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, and
          <citerefentry><refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum></citerefentry>
          for details.</para>

          <xi:include href="version-info.xml" xpointer="v256"/>
        </listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
      <title>See Also</title>
      <para><simplelist type="inline">
        <member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
        <member><citerefentry><refentrytitle>kernel-command-line</refentrytitle><manvolnum>7</manvolnum></citerefentry></member>
        <member><citerefentry><refentrytitle>smbios-type-11</refentrytitle><manvolnum>7</manvolnum></citerefentry></member>
      </simplelist></para>
  </refsect1>

</refentry>
