source: vbox/trunk/doc/manual/en_US/man_VBoxManage-modifynvram.xml@ 91617

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<refentry id="vboxmanage-modifynvram" lang="en">
  <refentryinfo>
    <pubdate>October 2021</pubdate>
    <title>VBoxManage modifynvram</title>
  </refentryinfo>

  <refmeta>
    <refentrytitle>VBoxManage-modifynvram</refentrytitle>
    <manvolnum>1</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>VBoxManage-modifynvram</refname>
    <refpurpose>List and modify the NVRAM content of a virtual machine</refpurpose>
    <refclass>Oracle VM VirtualBox</refclass>
  </refnamediv>

  <refsynopsisdiv>
    <cmdsynopsis id="synopsis-vboxmanage-modifynvram-inituefivarstore">
      <command>VBoxManage modifynvram</command>
      <arg choice="req"><replaceable>uuid|vmname</replaceable></arg>
      <arg choice="plain">inituefivarstore</arg>
    </cmdsynopsis>
    <cmdsynopsis id="synopsis-vboxmanage-modifynvram-enrollmssignatures">
      <command>VBoxManage modifynvram</command>
      <arg choice="req"><replaceable>uuid|vmname</replaceable></arg>
      <arg choice="plain">enrollmssignatures</arg>
    </cmdsynopsis>
    <cmdsynopsis id="synopsis-vboxmanage-modifynvram-enrollorclpk">
      <command>VBoxManage modifynvram</command>
      <arg choice="req"><replaceable>uuid|vmname</replaceable></arg>
      <arg choice="plain">enrollorclpk</arg>
    </cmdsynopsis>
    <cmdsynopsis id="synopsis-vboxmanage-modifynvram-enrollpk">
      <command>VBoxManage modifynvram</command>
      <arg choice="req"><replaceable>uuid|vmname</replaceable></arg>
      <arg choice="plain">enrollpk</arg>
      <arg>--platform-key=<replaceable>filename</replaceable></arg>
      <arg>--owner-uuid=<replaceable>uuid</replaceable></arg>
    </cmdsynopsis>
    <cmdsynopsis id="synopsis-vboxmanage-modifynvram-listvars">
      <command>VBoxManage modifynvram</command>
      <arg choice="req"><replaceable>uuid|vmname</replaceable></arg>
      <arg choice="plain">listvars</arg>
    </cmdsynopsis>
    <cmdsynopsis id="synopsis-vboxmanage-modifynvram-queryvar">
      <command>VBoxManage modifynvram</command>
      <arg choice="req"><replaceable>uuid|vmname</replaceable></arg>
      <arg choice="plain">queryvar</arg>
      <arg>--name=<replaceable>name</replaceable></arg>
      <arg>--filename=<replaceable>filename</replaceable></arg>
    </cmdsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para>The "modifynvram" commands are for experts who want to inspect and modify the
      UEFI variable store of a virtual machine. Any mistakes done here can bring the virtual
      machine in a non working state.</para>

    <refsect2 id="vboxmanage-modifynvram-common-options">
      <title>Common options</title>
      <remark role="help-scope" condition="GLOBAL"/>
      <para>The subcommands of <command>modifynvram</command> all operate on a running virtual
      machine:</para>
      <variablelist>
        <varlistentry>
          <term><replaceable>uuid|vmname</replaceable></term>
          <listitem><para>Either the UUID or the name (case sensitive) of a VM.</para></listitem>
        </varlistentry>
      </variablelist>
    </refsect2>

    <refsect2 id="vboxmanage-modifynvram-inituefivarstore">
      <title>modifynvram inituefivarstore</title>
      <remark role="help-copy-synopsis"/>
      <para>
        Iniitalizes the UEFI variable store to a default state. Any previous existing variable
        store is deleted. Use with extreme caution!
      </para>
    </refsect2>

    <refsect2 id="vboxmanage-modifynvram-enrollmssignatures">
      <title>modifynvram enrollmssignatures</title>
      <remark role="help-copy-synopsis"/>
      <para>
        Enrolls the default Microsoft KEK and DB signatures required for UEFI secure boot.
      </para>
    </refsect2>

    <refsect2 id="vboxmanage-modifynvram-enrollorclpk">
      <title>modifynvram enrollorclpk</title>
      <remark role="help-copy-synopsis"/>
      <para>
        Enrolls the default platform key provided by Oracle required for UEFI secure boot.
      </para>
    </refsect2>

    <refsect2 id="vboxmanage-modifynvram-enrollpk">
      <title>modifynvram enrollpk</title>
      <remark role="help-copy-synopsis"/>
      <para>
        Enrolls a custom platform key provided by the user required for UEFI secure boot.
        The following commands use openssl to generate a new platform key:
      </para>
<screen>$ openssl req -new -x509 -newkey rsa:2048 -keyout PK.key -out PK.crt</screen>
<screen>$ openssl x509 -in PK.crt -out PK.cer -outform DER</screen>
      <variablelist>
        <varlistentry>
          <term><option>--platform-key=<replaceable>filename</replaceable></option></term>
          <listitem><para>The platform key provided as a DER encoded X.509 signature.</para>
          </listitem>
        </varlistentry>
        <varlistentry>
          <term><option>--owner-uuid=<replaceable>uuid</replaceable></option></term>
          <listitem><para>The UUID identifying the owner of the platform key.</para>
          </listitem>
        </varlistentry>
      </variablelist>
    </refsect2>

    <refsect2 id="vboxmanage-modifynvram-listvars">
      <title>modifynvram listvars</title>
      <remark role="help-copy-synopsis"/>
      <para>
        Lists all UEFI variables in the virtual machines's store along with their owner UUID.
      </para>
    </refsect2>

    <refsect2 id="vboxmanage-modifynvram-queryvar">
      <title>modifynvram queryvar</title>
      <remark role="help-copy-synopsis"/>
      <para>
        Queries the content of a given UEFI variable identified by its name.
      </para>
      <variablelist>
        <varlistentry>
          <term><option>--name=<replaceable>name</replaceable></option></term>
          <listitem><para>UEFI variable name to query.</para>
          </listitem>
        </varlistentry>
        <varlistentry>
          <term><option>--filename=<replaceable>filename</replaceable></option></term>
          <listitem>
            <para>
              Where to store the content of the variable upon success. This is optional,
              if omitted the content will be dumped to the terminal as a hex dump.
            </para>
          </listitem>
        </varlistentry>
      </variablelist>
    </refsect2>

  </refsect1>
</refentry>