mirror of
https://github.com/systemd/systemd
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![Luca Boccassi](/assets/img/avatar_default.png)
This was lost on refactor, and only addons had a default uki
line in the .sbat. Add it back, and differentiate between the
default for UKIs vs the default for addons, so that they can
be revoked separately. These are only defaults and users are
encouraged to provide their own.
Follow-up for a8b645dec8
698 lines
35 KiB
XML
698 lines
35 KiB
XML
<?xml version="1.0"?>
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<!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="ukify" xmlns:xi="http://www.w3.org/2001/XInclude" conditional='ENABLE_UKIFY'>
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<refentryinfo>
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<title>ukify</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>ukify</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>ukify</refname>
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<refpurpose>Combine components into a signed Unified Kernel Image for UEFI systems</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>ukify</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">build</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>ukify</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">genkey</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>ukify</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="plain">inspect</arg>
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<arg choice="plain" rep="repeat">FILE</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>ukify</command> is a tool whose primary purpose is to combine components (usually a
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kernel, an initrd, and a UEFI boot stub) to create a
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<ulink url="https://uapi-group.org/specifications/specs/unified_kernel_image/">Unified Kernel Image (UKI)</ulink>
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— a PE binary that can be executed by the firmware to start the embedded linux kernel.
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See <citerefentry><refentrytitle>systemd-stub</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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for details about the stub.</para>
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</refsect1>
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<refsect1>
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<title>Commands</title>
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<para>The following commands are understood:</para>
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<refsect2>
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<title><command>build</command></title>
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<para>This command creates a Unified Kernel Image. The two primary options that should be specified for
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the <command>build</command> verb are <varname>Linux=</varname>/<option>--linux=</option>, and
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<varname>Initrd=</varname>/<option>--initrd=</option>. <varname>Initrd=</varname> accepts multiple
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whitespace-separated paths and <option>--initrd=</option> can be specified multiple times.</para>
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<para>Additional sections will be inserted into the UKI, either automatically or only if a specific
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option is provided. See the discussions of
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<varname>Cmdline=</varname>/<option>--cmdline=</option>,
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<varname>OSRelease=</varname>/<option>--os-release=</option>,
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<varname>DeviceTree=</varname>/<option>--devicetree=</option>,
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<varname>Splash=</varname>/<option>--splash=</option>,
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<varname>PCRPKey=</varname>/<option>--pcrpkey=</option>,
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<varname>Uname=</varname>/<option>--uname=</option>,
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<varname>SBAT=</varname>/<option>--sbat=</option>,
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and <option>--section=</option>
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below.</para>
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<para><command>ukify</command> can also be used to assemble a PE binary that is not executable but
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contains auxiliary data, for example additional kernel command line entries.</para>
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<para>If PCR signing keys are provided via the
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<varname>PCRPrivateKey=</varname>/<option>--pcr-private-key=</option> and
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<varname>PCRPublicKey=</varname>/<option>--pcr-public-key=</option> options, PCR values that will be seen
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after booting with the given kernel, initrd, and other sections, will be calculated, signed, and embedded
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in the UKI.
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<citerefentry><refentrytitle>systemd-measure</refentrytitle><manvolnum>1</manvolnum></citerefentry> is
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used to perform this calculation and signing.</para>
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<para>The calculation of PCR values is done for specific boot phase paths. Those can be specified with
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the <varname>Phases=</varname>/<option>--phases=</option> option. If not specified, the default provided
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by <command>systemd-measure</command> is used. It is also possible to specify the
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<varname>PCRPrivateKey=</varname>/<option>--pcr-private-key=</option>,
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<varname>PCRPublicKey=</varname>/<option>--pcr-public-key=</option>, and
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<varname>Phases=</varname>/<option>--phases=</option> arguments more than once. Signatures will then be
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performed with each of the specified keys. On the command line, when both <option>--phases=</option> and
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<option>--pcr-private-key=</option> are used, they must be specified the same number of times, and then
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the n-th boot phase path set will be signed by the n-th key. This can be used to build different trust
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policies for different phases of the boot. In the config file, <varname>PCRPrivateKey=</varname>,
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<varname>PCRPublicKey=</varname>, and <varname>Phases=</varname> are grouped into separate sections,
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describing separate boot phases. If <varname>SigningEngine=</varname>/<option>--signing-engine=</option>
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is specified, then the private keys arguments will be passed verbatim to OpenSSL as URIs, and the public
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key arguments will be loaded as X.509 certificates, so that signing can be performed with an OpenSSL
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engine.</para>
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<para>If a SecureBoot signing key is provided via the
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<varname>SecureBootPrivateKey=</varname>/<option>--secureboot-private-key=</option> option, the resulting
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PE binary will be signed as a whole, allowing the resulting UKI to be trusted by SecureBoot. Also see the
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discussion of automatic enrollment in
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<citerefentry><refentrytitle>systemd-boot</refentrytitle><manvolnum>7</manvolnum></citerefentry>.
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</para>
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<para>If the stub and/or the kernel contain <literal>.sbat</literal> sections they will be merged in
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the UKI so that revocation updates affecting either are considered when the UKI is loaded by Shim. For
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more information on SBAT see
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<ulink url="https://github.com/rhboot/shim/blob/main/SBAT.md">Shim documentation</ulink>.
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</para>
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</refsect2>
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<refsect2>
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<title><command>genkey</command></title>
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<para>This command creates the keys for PCR signing and the key and certificate used for SecureBoot
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signing. The same configuration options that determine what keys and in which paths will be needed for
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signing when <command>build</command> is used, here determine which keys will be created. See the
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discussion of <varname>PCRPrivateKey=</varname>/<option>--pcr-private-key=</option>,
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<varname>PCRPublicKey=</varname>/<option>--pcr-public-key=</option>, and
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<varname>SecureBootPrivateKey=</varname>/<option>--secureboot-private-key=</option> below.</para>
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<para>The output files must not exist.</para>
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</refsect2>
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<refsect2>
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<title><command>inspect</command></title>
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<para>Display information about the sections in a given binary or binaries.
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If <option>--all</option> is given, all sections are shown.
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Otherwise, if <option>--section=</option> option is specified at least once, only those sections are shown.
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Otherwise, well-known sections that are typically included in an UKI are shown.
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For each section, its name, size, and sha256-digest is printed.
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For text sections, the contents are printed.</para>
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<para>Also see the description of <option>-j</option>/<option>--json=</option> and
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<option>--section=</option>.</para>
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<para>Other tools that may be useful for inspect UKIs:
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<citerefentry project='man-pages'><refentrytitle>llvm-objdump</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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<option>-p</option> and <command>pe-inspect</command>.
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<!-- TODO: add link to pe-inspect man page when it gets one -->
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</para>
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</refsect2>
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</refsect1>
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<refsect1>
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<title>Configuration settings</title>
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<para>Settings can appear in configuration files (the syntax with <varname
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index='false'>SomeSetting=<replaceable>value</replaceable></varname>) and on the command line (the syntax
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with <option index='false'>--some-setting=<replaceable>value</replaceable></option>). For some command
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line parameters, a single-letter shortcut is also allowed. In the configuration files, the setting must
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be in the appropriate section, so the descriptions are grouped by section below. When the same setting
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appears in the configuration file and on the command line, generally the command line setting has higher
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priority and overwrites the config file setting completely. If some setting behaves differently, this is
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described below.</para>
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<para>If no config file is provided via the option <option>--config=<replaceable>PATH</replaceable></option>,
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<command>ukify</command> will try to look for a default configuration file in the following paths in this
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order: <filename>/run/systemd/ukify.conf</filename>, <filename>/etc/systemd/ukify.conf</filename>,
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<filename>/usr/local/lib/systemd/ukify.conf</filename>, and <filename>/usr/lib/systemd/ukify.conf</filename>,
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and then load the first one found. <command>ukify</command> will proceed normally if no configuration file
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is specified and no default one is found.</para>
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<para>The <replaceable>LINUX</replaceable> and <replaceable>INITRD</replaceable> positional arguments, or
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the equivalent <varname>Linux=</varname> and <varname>Initrd=</varname> settings, are optional. If more
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than one initrd is specified, they will all be combined into a single PE section. This is useful to, for
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example, prepend microcode before the actual initrd.</para>
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<para>The following options and settings are understood:</para>
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<refsect2>
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<title>Command line-only options</title>
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<variablelist>
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<varlistentry>
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<term><option>--config=<replaceable>PATH</replaceable></option></term>
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<listitem><para>Load configuration from the given config file. In general, settings specified in
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the config file have lower precedence than the settings specified via options. In cases where the
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command line option does not fully override the config file setting are explicitly mentioned in the
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descriptions of individual options.</para>
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<xi:include href="version-info.xml" xpointer="v254"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--measure</option></term>
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<term><option>--no-measure</option></term>
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<listitem><para>Enable or disable a call to
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<citerefentry><refentrytitle>systemd-measure</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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to print pre-calculated PCR values. Defaults to false.</para>
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<xi:include href="version-info.xml" xpointer="v253"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--section=<replaceable>NAME</replaceable>:<replaceable>TEXT</replaceable>|<replaceable>@PATH</replaceable></option></term>
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<term><option>--section=<replaceable>NAME</replaceable>:text|binary<optional>@<replaceable>PATH</replaceable></optional></option></term>
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<listitem><para>For all verbs except <command>inspect</command>, the first syntax is used.
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Specify an arbitrary additional section <literal><replaceable>NAME</replaceable></literal>.
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The argument may be a literal string, or <literal>@</literal> followed by a path name.
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This option may be specified more than once. Any sections specified in this fashion will be
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inserted (in order) before the <literal>.linux</literal> section which is always last.</para>
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<para>For the <command>inspect</command> verb, the second syntax is used.
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The section <replaceable>NAME</replaceable> will be inspected (if found).
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If the second argument is <literal>text</literal>, the contents will be printed.
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If the third argument is given, the contents will be saved to file <replaceable>PATH</replaceable>.
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</para>
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<para>Note that the name is used as-is, and if the section name should start with a dot, it must be
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included in <replaceable>NAME</replaceable>.</para>
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<xi:include href="version-info.xml" xpointer="v253"/>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--tools=<replaceable>DIRS</replaceable></option></term>
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<listitem><para>Specify one or more directories with helper tools. <command>ukify</command> will
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look for helper tools in those directories first, and if not found, try to load them from
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<varname>$PATH</varname> in the usual fashion.</para>
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<xi:include href="version-info.xml" xpointer="v253"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--output=<replaceable>FILENAME</replaceable></option></term>
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<listitem><para>The output filename. If not specified, the name of the
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<replaceable>LINUX</replaceable> argument, with the suffix <literal>.unsigned.efi</literal> or
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<literal>.signed.efi</literal> will be used, depending on whether signing for SecureBoot was
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performed.</para>
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<xi:include href="version-info.xml" xpointer="v253"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--summary</option></term>
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<listitem><para>Print a summary of loaded config and exit. This is useful to check how the options
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from the configuration file and the command line are combined.</para>
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<xi:include href="version-info.xml" xpointer="v254"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--all</option></term>
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<listitem><para>Print all sections (with <command>inspect</command> verb).</para>
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<xi:include href="version-info.xml" xpointer="v255"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--json</option></term>
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<listitem><para>Generate JSON output (with <command>inspect</command> verb).</para>
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<xi:include href="version-info.xml" xpointer="v255"/></listitem>
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</varlistentry>
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<xi:include href="standard-options.xml" xpointer="help" />
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<xi:include href="standard-options.xml" xpointer="version" />
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</variablelist>
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</refsect2>
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<refsect2>
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<title>[UKI] section</title>
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<variablelist>
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<varlistentry>
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<term><varname>Linux=<replaceable>LINUX</replaceable></varname></term>
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<term><option>--linux=<replaceable>LINUX</replaceable></option></term>
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<listitem><para>A path to the kernel binary.</para>
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<xi:include href="version-info.xml" xpointer="v254"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Initrd=<replaceable>INITRD</replaceable>...</varname></term>
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<term><option>--initrd=<replaceable>LINUX</replaceable></option></term>
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<listitem><para>Zero or more initrd paths. In the configuration file, items are separated by
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whitespace. The initrds are combined in the order of specification, with the initrds specified in
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the config file first.</para>
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<xi:include href="version-info.xml" xpointer="v254"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Cmdline=<replaceable>TEXT</replaceable>|<replaceable>@PATH</replaceable></varname></term>
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<term><option>--cmdline=<replaceable>TEXT</replaceable>|<replaceable>@PATH</replaceable></option></term>
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<listitem><para>The kernel command line (the <literal>.cmdline</literal> section). The argument may
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be a literal string, or <literal>@</literal> followed by a path name. If not specified, no command
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line will be embedded.</para>
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<xi:include href="version-info.xml" xpointer="v253"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>OSRelease=<replaceable>TEXT</replaceable>|<replaceable>@PATH</replaceable></varname></term>
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<term><option>--os-release=<replaceable>TEXT</replaceable>|<replaceable>@PATH</replaceable></option></term>
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<listitem><para>The os-release description (the <literal>.osrel</literal> section). The argument
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may be a literal string, or <literal>@</literal> followed by a path name. If not specified, the
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<citerefentry><refentrytitle>os-release</refentrytitle><manvolnum>5</manvolnum></citerefentry> file
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will be picked up from the host system.</para>
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<xi:include href="version-info.xml" xpointer="v253"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>DeviceTree=<replaceable>PATH</replaceable></varname></term>
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<term><option>--devicetree=<replaceable>PATH</replaceable></option></term>
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<listitem><para>The devicetree description (the <literal>.dtb</literal> section). The argument is a
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path to a compiled binary DeviceTree file. If not specified, the section will not be present.
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</para>
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<xi:include href="version-info.xml" xpointer="v253"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Splash=<replaceable>PATH</replaceable></varname></term>
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<term><option>--splash=<replaceable>PATH</replaceable></option></term>
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<listitem><para>A picture to display during boot (the <literal>.splash</literal> section). The
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argument is a path to a BMP file. If not specified, the section will not be present.
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</para>
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<xi:include href="version-info.xml" xpointer="v253"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>PCRPKey=<replaceable>PATH</replaceable></varname></term>
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<term><option>--pcrpkey=<replaceable>PATH</replaceable></option></term>
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<listitem><para>A path to a public key to embed in the <literal>.pcrpkey</literal> section. If not
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specified, and there's exactly one
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<varname>PCRPublicKey=</varname>/<option>--pcr-public-key=</option> argument, that key will be used.
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Otherwise, the section will not be present.</para>
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<xi:include href="version-info.xml" xpointer="v253"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Uname=<replaceable>VERSION</replaceable></varname></term>
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<term><option>--uname=<replaceable>VERSION</replaceable></option></term>
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<listitem><para>Specify the kernel version (as in <command>uname -r</command>, the
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<literal>.uname</literal> section). If not specified, an attempt will be made to extract the
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version string from the kernel image. It is recommended to pass this explicitly if known, because
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the extraction is based on heuristics and not very reliable. If not specified and extraction fails,
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the section will not be present.</para>
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<xi:include href="version-info.xml" xpointer="v253"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>PCRBanks=<replaceable>PATH</replaceable></varname></term>
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<term><option>--pcr-banks=<replaceable>PATH</replaceable></option></term>
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<listitem><para>A comma or space-separated list of PCR banks to sign a policy for. If not present,
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all known banks will be used (<literal>sha1</literal>, <literal>sha256</literal>,
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<literal>sha384</literal>, <literal>sha512</literal>), which will fail if not supported by the
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system.</para>
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<xi:include href="version-info.xml" xpointer="v253"/></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>SecureBootSigningTool=<replaceable>SIGNER</replaceable></varname></term>
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<term><option>--signtool=<replaceable>SIGNER</replaceable></option></term>
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<listitem><para>Whether to use <literal>sbsign</literal> or <literal>pesign</literal>.
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Depending on this choice, different parameters are required in order to sign an image.
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Defaults to <literal>sbsign</literal>.</para>
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|
<xi:include href="version-info.xml" xpointer="v254"/></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>SecureBootPrivateKey=<replaceable>SB_KEY</replaceable></varname></term>
|
|
<term><option>--secureboot-private-key=<replaceable>SB_KEY</replaceable></option></term>
|
|
|
|
<listitem><para>A path to a private key to use for signing of the resulting binary. If the
|
|
<varname>SigningEngine=</varname>/<option>--signing-engine=</option> option is used, this may also be
|
|
an engine-specific designation. This option is required by
|
|
<varname>SecureBootSigningTool=sbsign</varname>/<option>--signtool=sbsign</option>. </para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v253"/></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>SecureBootCertificate=<replaceable>SB_CERT</replaceable></varname></term>
|
|
<term><option>--secureboot-certificate=<replaceable>SB_CERT</replaceable></option></term>
|
|
|
|
<listitem><para>A path to a certificate to use for signing of the resulting binary. If the
|
|
<varname>SigningEngine=</varname>/<option>--signing-engine=</option> option is used, this may also
|
|
be an engine-specific designation. This option is required by
|
|
<varname>SecureBootSigningTool=sbsign</varname>/<option>--signtool=sbsign</option>. </para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v253"/></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>SecureBootCertificateDir=<replaceable>SB_PATH</replaceable></varname></term>
|
|
<term><option>--secureboot-certificate-dir=<replaceable>SB_PATH</replaceable></option></term>
|
|
|
|
<listitem><para>A path to a nss certificate database directory to use for signing of the resulting binary.
|
|
Takes effect when <varname>SecureBootSigningTool=pesign</varname>/<option>--signtool=pesign</option> is used.
|
|
Defaults to <filename>/etc/pki/pesign</filename>.</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v254"/></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>SecureBootCertificateName=<replaceable>SB_CERTNAME</replaceable></varname></term>
|
|
<term><option>--secureboot-certificate-name=<replaceable>SB_CERTNAME</replaceable></option></term>
|
|
|
|
<listitem><para>The name of the nss certificate database entry to use for signing of the resulting binary.
|
|
This option is required by <varname>SecureBootSigningTool=pesign</varname>/<option>--signtool=pesign</option>.</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v254"/></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>SecureBootCertificateValidity=<replaceable>DAYS</replaceable></varname></term>
|
|
<term><option>--secureboot-certificate-validity=<replaceable>DAYS</replaceable></option></term>
|
|
|
|
<listitem><para>Period of validity (in days) for a certificate created by
|
|
<command>genkey</command>. Defaults to 3650, i.e. 10 years.</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v254"/></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>SigningEngine=<replaceable>ENGINE</replaceable></varname></term>
|
|
<term><option>--signing-engine=<replaceable>ENGINE</replaceable></option></term>
|
|
|
|
<listitem><para>An "engine" for signing of the resulting binary. This option is currently passed
|
|
verbatim to the <option>--engine=</option> option of
|
|
<citerefentry project='archlinux'><refentrytitle>sbsign</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
|
|
</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v253"/></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>SignKernel=<replaceable>BOOL</replaceable></varname></term>
|
|
<term><option>--sign-kernel</option></term>
|
|
<term><option>--no-sign-kernel</option></term>
|
|
|
|
<listitem><para>Override the detection of whether to sign the Linux binary itself before it is
|
|
embedded in the combined image. If not specified, it will be signed if a SecureBoot signing key is
|
|
provided via the
|
|
<varname>SecureBootPrivateKey=</varname>/<option>--secureboot-private-key=</option> option and the
|
|
binary has not already been signed. If
|
|
<varname>SignKernel=</varname>/<option>--sign-kernel</option> is true, and the binary has already
|
|
been signed, the signature will be appended anyway.</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v253"/></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>SBAT=<replaceable>TEXT</replaceable>|<replaceable>@PATH</replaceable></varname></term>
|
|
<term><option>--sbat=<replaceable>TEXT</replaceable>|<replaceable>@PATH</replaceable></option></term>
|
|
|
|
<listitem><para>SBAT metadata associated with the UKI or addon. SBAT policies are useful to revoke
|
|
whole groups of UKIs or addons with a single, static policy update that does not take space in
|
|
DBX/MOKX. If not specified manually, a default metadata entry consisting of
|
|
<literal>uki,1,UKI,uki,1,https://uapi-group.org/specifications/specs/unified_kernel_image/</literal>
|
|
for UKIs and
|
|
<literal>uki-addon,1,UKI Addon,addon,1,https://www.freedesktop.org/software/systemd/man/latest/systemd-stub.html</literal>
|
|
for addons will be used, to ensure it is always possible to revoke them. For more information on
|
|
SBAT see <ulink url="https://github.com/rhboot/shim/blob/main/SBAT.md">Shim documentation</ulink>.
|
|
</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v254"/></listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect2>
|
|
|
|
<refsect2>
|
|
<title>[PCRSignature:<replaceable>NAME</replaceable>] section</title>
|
|
|
|
<para>In the config file, those options are grouped by section. On the command line, they
|
|
must be specified in the same order. The sections specified in both sources are combined.
|
|
</para>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><varname>PCRPrivateKey=<replaceable>PATH</replaceable></varname></term>
|
|
<term><option>--pcr-private-key=<replaceable>PATH</replaceable></option></term>
|
|
|
|
<listitem><para>A private key to use for signing PCR policies. On the command line, this option may
|
|
be specified more than once, in which case multiple signatures will be made.</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v253"/></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>PCRPublicKey=<replaceable>PATH</replaceable></varname></term>
|
|
<term><option>--pcr-public-key=<replaceable>PATH</replaceable></option></term>
|
|
|
|
<listitem><para>A public key to use for signing PCR policies.</para>
|
|
|
|
<para>On the command line, this option may be specified more than once, similarly to the
|
|
<option>--pcr-private-key=</option> option. If not present, the public keys will be extracted from
|
|
the private keys. On the command line, if present, this option must be specified the same number of
|
|
times as the <option>--pcr-private-key=</option> option.</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v253"/></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>Phases=<replaceable>LIST</replaceable></varname></term>
|
|
<term><option>--phases=<replaceable>LIST</replaceable></option></term>
|
|
|
|
<listitem><para>A comma or space-separated list of colon-separated phase paths to sign a policy
|
|
for. Each set of boot phase paths will be signed with the corresponding private key. If not
|
|
present, the default of
|
|
<citerefentry><refentrytitle>systemd-measure</refentrytitle><manvolnum>1</manvolnum></citerefentry>
|
|
will be used.</para>
|
|
|
|
<para>On the command line, when this argument is present, it must appear the same number of times as
|
|
the <option>--pcr-private-key=</option> option. </para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v253"/></listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect2>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Examples</title>
|
|
|
|
<example>
|
|
<title>Minimal invocation</title>
|
|
|
|
<programlisting>$ ukify build \
|
|
--linux=/lib/modules/6.0.9-300.fc37.x86_64/vmlinuz \
|
|
--initrd=/some/path/initramfs-6.0.9-300.fc37.x86_64.img \
|
|
--cmdline='quiet rw'
|
|
</programlisting>
|
|
|
|
<para>This creates an unsigned UKI <filename>./vmlinuz.unsigned.efi</filename>.</para>
|
|
</example>
|
|
|
|
<example>
|
|
<title>All the bells and whistles</title>
|
|
|
|
<programlisting>$ ukify build \
|
|
--linux=/lib/modules/6.0.9-300.fc37.x86_64/vmlinuz \
|
|
--initrd=early_cpio \
|
|
--initrd=/some/path/initramfs-6.0.9-300.fc37.x86_64.img \
|
|
--sbat='sbat,1,SBAT Version,sbat,1,https://github.com/rhboot/shim/blob/main/SBAT.md
|
|
uki.author.myimage,1,UKI for System,uki.author.myimage,1,https://uapi-group.org/specifications/specs/unified_kernel_image/' \
|
|
--pcr-private-key=pcr-private-initrd-key.pem \
|
|
--pcr-public-key=pcr-public-initrd-key.pem \
|
|
--phases='enter-initrd' \
|
|
--pcr-private-key=pcr-private-system-key.pem \
|
|
--pcr-public-key=pcr-public-system-key.pem \
|
|
--phases='enter-initrd:leave-initrd enter-initrd:leave-initrd:sysinit \
|
|
enter-initrd:leave-initrd:sysinit:ready' \
|
|
--pcr-banks=sha384,sha512 \
|
|
--secureboot-private-key=sb.key \
|
|
--secureboot-certificate=sb.cert \
|
|
--sign-kernel \
|
|
--cmdline='quiet rw rhgb'
|
|
</programlisting>
|
|
|
|
<para>This creates a signed UKI <filename index='false'>./vmlinuz.signed.efi</filename>.
|
|
The initrd section contains two concatenated parts, <filename index='false'>early_cpio</filename>
|
|
and <filename index='false'>initramfs-6.0.9-300.fc37.x86_64.img</filename>.
|
|
The policy embedded in the <literal>.pcrsig</literal> section will be signed for the initrd (the
|
|
<constant>enter-initrd</constant> phase) with the key
|
|
<filename index='false'>pcr-private-initrd-key.pem</filename>, and for the main system (phases
|
|
<constant>leave-initrd</constant>, <constant>sysinit</constant>, <constant>ready</constant>) with the
|
|
key <filename index='false'>pcr-private-system-key.pem</filename>. The Linux binary and the resulting
|
|
combined image will be signed with the SecureBoot key <filename index='false'>sb.key</filename>.</para>
|
|
</example>
|
|
|
|
<example>
|
|
<title>All the bells and whistles, via a config file</title>
|
|
|
|
<para>This is the same as the previous example, but this time the configuration is stored in a
|
|
file:</para>
|
|
|
|
<programlisting>$ cat ukify.conf
|
|
[UKI]
|
|
Initrd=early_cpio
|
|
Cmdline=quiet rw rhgb
|
|
|
|
SecureBootPrivateKey=sb.key
|
|
SecureBootCertificate=sb.cert
|
|
SignKernel=yes
|
|
PCRBanks=sha384,sha512
|
|
|
|
[PCRSignature:initrd]
|
|
PCRPrivateKey=pcr-private-initrd-key.pem
|
|
PCRPublicKey=pcr-public-initrd-key.pem
|
|
Phases=enter-initrd
|
|
|
|
[PCRSignature:system]
|
|
PCRPrivateKey=pcr-private-system-key.pem
|
|
PCRPublicKey=pcr-public-system-key.pem
|
|
Phases=enter-initrd:leave-initrd
|
|
enter-initrd:leave-initrd:sysinit
|
|
enter-initrd:leave-initrd:sysinit:ready
|
|
|
|
$ ukify -c ukify.conf build \
|
|
--linux=/lib/modules/6.0.9-300.fc37.x86_64/vmlinuz \
|
|
--initrd=/some/path/initramfs-6.0.9-300.fc37.x86_64.img
|
|
</programlisting>
|
|
|
|
<para>One "initrd" (<filename index='false'>early_cpio</filename>) is specified in the config file, and
|
|
the other initrd (<filename index='false'>initramfs-6.0.9-300.fc37.x86_64.img</filename>) is specified
|
|
on the command line. This may be useful for example when the first initrd contains microcode for the CPU
|
|
and does not need to be updated when the kernel version changes, unlike the actual initrd.</para>
|
|
</example>
|
|
|
|
<example>
|
|
<title>Kernel command line auxiliary PE</title>
|
|
|
|
<programlisting>ukify build \
|
|
--secureboot-private-key=sb.key \
|
|
--secureboot-certificate=sb.cert \
|
|
--cmdline='debug' \
|
|
--sbat='sbat,1,SBAT Version,sbat,1,https://github.com/rhboot/shim/blob/main/SBAT.md
|
|
uki-addon.author,1,UKI Addon for System,uki-addon.author,1,https://www.freedesktop.org/software/systemd/man/systemd-stub.html'
|
|
--output=debug.cmdline
|
|
</programlisting>
|
|
|
|
<para>This creates a signed PE binary that contains the additional kernel command line parameter
|
|
<literal>debug</literal> with SBAT metadata referring to the owner of the addon.</para>
|
|
</example>
|
|
|
|
<example>
|
|
<title>Decide signing policy and create certificate and keys</title>
|
|
|
|
<para>First, let's create an config file that specifies what signatures shall be made:</para>
|
|
|
|
<programlisting># cat >/etc/kernel/uki.conf <<EOF
|
|
<xi:include href="uki.conf.example" parse="text" />EOF</programlisting>
|
|
|
|
<para>Next, we can generate the certificate and keys:</para>
|
|
<programlisting># ukify genkey --config=/etc/kernel/uki.conf
|
|
Writing SecureBoot private key to /etc/kernel/secure-boot.key.pem
|
|
Writing SecureBoot certificate to /etc/kernel/secure-boot.cert.pem
|
|
Writing private key for PCR signing to /etc/kernel/pcr-initrd.key.pem
|
|
Writing public key for PCR signing to /etc/kernel/pcr-initrd.pub.pem
|
|
Writing private key for PCR signing to /etc/kernel/pcr-system.key.pem
|
|
Writing public key for PCR signing to /etc/kernel/pcr-system.pub.pem
|
|
</programlisting>
|
|
|
|
<para>(Both operations need to be done as root to allow write access
|
|
to <filename>/etc/kernel/</filename>.)</para>
|
|
|
|
<para>Subsequent invocations using the config file
|
|
(<command>ukify build --config=/etc/kernel/uki.conf</command>)
|
|
will use this certificate and key files. Note that the
|
|
<citerefentry><refentrytitle>kernel-install</refentrytitle><manvolnum>8</manvolnum></citerefentry>
|
|
plugin <filename>60-ukify.install</filename> uses <filename>/etc/kernel/uki.conf</filename>
|
|
by default, so after this file has been created, installations of kernels that create a UKI on the
|
|
local machine using <command>kernel-install</command> will perform signing using this config.</para>
|
|
</example>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para><simplelist type="inline">
|
|
<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>systemd-stub</refentrytitle><manvolnum>7</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>systemd-boot</refentrytitle><manvolnum>7</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>systemd-measure</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>systemd-pcrphase.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
|
|
</simplelist></para>
|
|
</refsect1>
|
|
|
|
</refentry>
|