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<?xml version="1.0"?>
<!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
<refentry id="systemd-tpm2-setup.service" conditional='ENABLE_BOOTLOADER'
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>systemd-tpm2-setup.service</title>
<productname>systemd</productname>
</refentryinfo>
<refmeta>
<refentrytitle>systemd-tpm2-setup.service</refentrytitle>
<manvolnum>8</manvolnum>
</refmeta>
<refnamediv>
<refname>systemd-tpm2-setup.service</refname>
<refname>systemd-tpm2-setup-early.service</refname>
<refname>systemd-tpm2-setup</refname>
<refpurpose>Set up the TPM2 Storage Root Key (SRK) at boot</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename>systemd-tpm2-setup.service</filename></para>
<para><filename>/usr/lib/systemd/systemd-tpm2-setup</filename></para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><filename>systemd-tpm2-setup.service</filename> and
<filename>systemd-tpm2-setup-early.service</filename> are services that generate the Storage Root Key
(SRK) if it hasn't been generated yet, and stores it in the TPM.</para>
<para>The services will store the public key of the SRK key pair in a PEM file in
<filename>/run/systemd/tpm2-srk-public-key.pem</filename> and
<filename>/var/lib/systemd/tpm2-srk-public-key.pem</filename>. They will also store it in TPM2B_PUBLIC
format in <filename>/run/systemd/tpm2-srk-public-key.tpm2_public</filename> and
<filename>/var/lib/systemd/tpm2-srk-public-key.tpm2b_public</filename>.</para>
<para><filename>systemd-tpm2-setup-early.service</filename> runs very early at boot (possibly in the
initrd), and writes the SRK public key to <filename>/run/systemd/tpm2-srk-public-key.*</filename> (as
<filename>/var/</filename> is generally not accessible this early yet), while
<filename>systemd-tpm2-setup.service</filename> runs during a later boot phase and saves the public key
to <filename>/var/lib/systemd/tpm2-srk-public-key.*</filename>.</para>
</refsect1>
<refsect1>
<title>Files</title>
<variablelist>
<varlistentry>
<term><filename>/run/systemd/tpm2-srk-public-key.pem</filename></term>
<term><filename>/run/systemd/tpm2-srk-public-key.tpm2b_public</filename></term>
<listitem><para>The SRK public key in PEM and TPM2B_PUBLIC format, written during early boot.</para>
<xi:include href="version-info.xml" xpointer="v255"/></listitem>
</varlistentry>
<varlistentry>
<term><filename>/var/lib/systemd/tpm2-srk-public-key.pem</filename></term>
<term><filename>/var/lib/systemd/tpm2-srk-public-key.tpm2_public</filename></term>
<listitem><para>The SRK public key in PEM and TPM2B_PUBLIC format, written during later boot (once
<filename>/var/</filename> is available).</para>
<xi:include href="version-info.xml" xpointer="v255"/></listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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