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diff --git a/man/loader.conf.xml b/man/loader.conf.xml new file mode 100644 index 0000000..a7db82d --- /dev/null +++ b/man/loader.conf.xml @@ -0,0 +1,430 @@ +<?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="loader.conf" conditional='ENABLE_BOOTLOADER' + xmlns:xi="http://www.w3.org/2001/XInclude"> + <refentryinfo> + <title>loader.conf</title> + <productname>systemd</productname> + </refentryinfo> + + <refmeta> + <refentrytitle>loader.conf</refentrytitle> + <manvolnum>5</manvolnum> + </refmeta> + + <refnamediv> + <refname>loader.conf</refname> + <refpurpose>Configuration file for systemd-boot</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <para><filename><replaceable>ESP</replaceable>/loader/loader.conf</filename>, + <filename><replaceable>ESP</replaceable>/loader/entries/*.conf</filename> + <filename><replaceable>XBOOTLDR</replaceable>/loader/entries/*.conf</filename> + </para> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para> + <citerefentry><refentrytitle>systemd-boot</refentrytitle><manvolnum>7</manvolnum></citerefentry> will + read <filename><replaceable>ESP</replaceable>/loader/loader.conf</filename>, and any files with the + <literal>.conf</literal> extension under + <filename><replaceable>ESP</replaceable>/loader/entries/</filename> on the EFI system partition (ESP), + and <filename><replaceable>XBOOTLDR</replaceable>/loader/entries/</filename> on the extended boot loader + partition (XBOOTLDR) as defined by <ulink url="https://uapi-group.org/specifications/specs/boot_loader_specification">Boot Loader + Specification</ulink>. + </para> + + <para>Each of these configuration files must consist of series of newline (i.e. ASCII code 10) separated + lines, each consisting of an option name, followed by whitespace, and the option + value. <literal>#</literal> may be used to start a comment line. Empty and comment lines are ignored. The + files use UTF-8 encoding.</para> + + <para>Boolean arguments may be written as + <literal>yes</literal>/<literal>y</literal>/<literal>true</literal>/<literal>t</literal>/<literal>on</literal>/<literal>1</literal> or + <literal>no</literal>/<literal>n</literal>/<literal>false</literal>/<literal>f</literal>/<literal>off</literal>/<literal>0</literal>. + </para> + </refsect1> + + <refsect1> + <title>Options</title> + + <para>The configuration options supported by + <filename><replaceable>ESP</replaceable>/loader/entries/*.conf</filename> and + <filename><replaceable>XBOOTLDR</replaceable>/loader/entries/*.conf</filename> files are defined as part + of the <ulink url="https://uapi-group.org/specifications/specs/boot_loader_specification">Boot Loader + Specification</ulink>.</para> + + <para>The following configuration are supported by the <filename>loader.conf</filename> configuration + file:</para> + + <variablelist> + <varlistentry> + <term>default</term> + + <listitem><para>A glob pattern to select the default entry. The default entry + may be changed in the boot menu itself, in which case the name of the + selected entry will be stored as an EFI variable, overriding this option. + </para> + + <para>If set to <literal>@saved</literal> the chosen entry will be saved as an EFI variable + on every boot and automatically selected the next time the boot loader starts.</para> + + <table> + <title>Automatically detected entries will use the following names:</title> + + <tgroup cols='2'> + <colspec colname='name' /> + <colspec colname='expl' /> + <thead> + <row> + <entry>Name</entry> + <entry>Description</entry> + </row> + </thead> + <tbody> + <row> + <entry>auto-efi-default</entry> + <entry>EFI Default Loader</entry> + </row> + <row> + <entry>auto-efi-shell</entry> + <entry>EFI Shell</entry> + </row> + <row> + <entry>auto-osx</entry> + <entry>macOS</entry> + </row> + <row> + <entry>auto-poweroff</entry> + <entry>Power Off The System</entry> + </row> + <row> + <entry>auto-reboot</entry> + <entry>Reboot The System</entry> + </row> + <row> + <entry>auto-reboot-to-firmware-setup</entry> + <entry>Reboot Into Firmware Interface</entry> + </row> + <row> + <entry>auto-windows</entry> + <entry>Windows Boot Manager</entry> + </row> + </tbody> + </tgroup> + </table> + + <para>Supported glob wildcard patterns are <literal>?</literal>, <literal>*</literal>, and + <literal>[…]</literal> (including ranges). Note that these patterns use the same syntax as + <citerefentry project='man-pages'><refentrytitle>glob</refentrytitle><manvolnum>7</manvolnum></citerefentry>, + but do not support all features. In particular, set negation and named character classes are not + supported. The matching is done case-insensitively on the entry ID (as shown by <command>bootctl + list</command>).</para> + + <xi:include href="version-info.xml" xpointer="v239"/></listitem> + </varlistentry> + + <varlistentry> + <term>timeout</term> + + <listitem><para>How long the boot menu should be shown before the default + entry is booted, in seconds. This may be changed in the boot menu itself and + will be stored as an EFI variable in that case, overriding this option. + </para> + + <para>If set to <literal>menu-disabled</literal> or <literal>menu-hidden</literal> or <literal>0</literal> + (the default), no menu is shown and the default entry will be booted immediately. Unless + <literal>menu-disabled</literal> is used, the menu can be shown + by pressing and holding a key before systemd-boot is launched. Setting this to + <literal>menu-force</literal> disables the timeout while always showing the menu.</para> + + <xi:include href="version-info.xml" xpointer="v239"/> + </listitem> + </varlistentry> + + <varlistentry> + <term>console-mode</term> + + <listitem><para>This option configures the resolution of the console. This may be changed in + the boot menu itself and will be stored as an EFI variable in that case, overriding this + option.</para> + + <para>Takes a number or one of the special values listed below. The following + values may be used:</para> + + <variablelist> + <varlistentry> + <term>0</term> + <listitem> + <para>Standard UEFI 80x25 mode</para> + + <xi:include href="version-info.xml" xpointer="v239"/> + </listitem> + </varlistentry> + + <varlistentry> + <term>1</term> + <listitem> + <para>80x50 mode, not supported by all devices</para> + + <xi:include href="version-info.xml" xpointer="v239"/> + </listitem> + </varlistentry> + + <varlistentry> + <term>2</term> + <listitem> + <para>the first non-standard mode provided by the device + firmware, if any</para> + + <xi:include href="version-info.xml" xpointer="v239"/> + </listitem> + </varlistentry> + + <varlistentry> + <term>auto</term> + <listitem> + <para>Pick a suitable mode automatically using heuristics</para> + + <xi:include href="version-info.xml" xpointer="v239"/> + </listitem> + </varlistentry> + + <varlistentry> + <term>max</term> + <listitem> + <para>Pick the highest-numbered available mode</para> + + <xi:include href="version-info.xml" xpointer="v239"/> + </listitem> + </varlistentry> + + <varlistentry> + <term>keep</term> + <listitem> + <para>Keep the mode selected by firmware (the default)</para> + + <xi:include href="version-info.xml" xpointer="v239"/> + </listitem> + </varlistentry> + </variablelist> + + <xi:include href="version-info.xml" xpointer="v239"/> + + </listitem> + </varlistentry> + + <varlistentry> + <term>editor</term> + + <listitem><para>Takes a boolean argument. Enable (the default) or disable the + editor. The editor should be disabled if the machine can be accessed by + unauthorized persons.</para> + + <xi:include href="version-info.xml" xpointer="v239"/></listitem> + </varlistentry> + + <varlistentry> + <term>auto-entries</term> + + <listitem><para>Takes a boolean argument. Enable (the default) or disable + entries for other boot entries found on the boot partition. In particular, + this may be useful when loader entries are created to show replacement + descriptions for those entries.</para> + + <xi:include href="version-info.xml" xpointer="v239"/></listitem> + </varlistentry> + + <varlistentry> + <term>auto-firmware</term> + + <listitem><para>A boolean controlling the presence of the <literal>Reboot Into Firmware + Interface</literal> entry (enabled by default). If this is disabled, the firmware interface may still + be reached by using the <keycap>f</keycap> key.</para> + + <xi:include href="version-info.xml" xpointer="v239"/></listitem> + </varlistentry> + + <varlistentry> + <term>beep</term> + + <listitem><para>Takes a boolean argument. If timeout enabled beep every second, otherwise beep n times when n-th entry in boot menu is selected (default disabled). + Currently, only x86 is supported, where it uses the PC speaker.</para> + + <xi:include href="version-info.xml" xpointer="v251"/></listitem> + </varlistentry> + + <varlistentry> + <term>secure-boot-enroll</term> + + <listitem><para>Danger: this feature might soft-brick your device if used improperly.</para> + + <para>Controls enrollment of secure boot keys found on the ESP if the system is in setup mode: + <variablelist> + <varlistentry> + <term><option>off</option></term> + <listitem><para>No action is taken.</para> + + <xi:include href="version-info.xml" xpointer="v253"/></listitem> + </varlistentry> + + <varlistentry> + <term><option>manual</option></term> + <listitem><para>Boot entries for found secure boot keys are created that allow manual + enrollment.</para> + + <xi:include href="version-info.xml" xpointer="v253"/></listitem> + </varlistentry> + + <varlistentry> + <term><option>if-safe</option></term> + <listitem><para>Same behavior as <option>manual</option>, but will try to automatically + enroll the key <literal>auto</literal> if it is considered to be safe. Currently, this is only + the case if the system is running inside a virtual machine.</para> + + <xi:include href="version-info.xml" xpointer="v253"/></listitem> + </varlistentry> + + <varlistentry> + <term><option>force</option></term> + <listitem><para>Always enroll the <literal>auto</literal> key if found. Note that a warning + message with a timeout will still be shown if this operation is unknown to be safe.</para> + + <xi:include href="version-info.xml" xpointer="v253"/></listitem> + </varlistentry> + </variablelist> + </para> + + <para>The different sets of variables can be set up under + <filename>/loader/keys/<replaceable>NAME</replaceable></filename> where + <replaceable>NAME</replaceable> is the name that is going to be used as the name of the entry. This + allows one to ship multiple sets of Secure Boot variables and choose which one to enroll at runtime. + </para> + + <para>Supported Secure Boot variables are one database for authorized images, one for the key + exchange key (KEK) and one for the platform key (PK). For more information, refer to the + <ulink url="https://uefi.org/specifications">UEFI specification</ulink>, under Secure Boot and Driver + Signing. Another resource that describe the interplay of the different variables is the + <ulink url="https://edk2-docs.gitbook.io/understanding-the-uefi-secure-boot-chain/secure_boot_chain_in_uefi/uefi_secure_boot"> + EDK2 documentation</ulink>.</para> + + <para>A complete set of UEFI variable includes <filename>db.auth</filename>, <filename>KEK.auth</filename> + and <filename>PK.auth</filename>. Note that these files need to be authenticated UEFI variables. See + below for an example of how to generate them from regular X.509 keys.</para> + + <programlisting>uuid=$(systemd-id128 new --uuid) +for key in PK KEK db; do + openssl req -new -x509 -subj "/CN=${key}/" -keyout "${key}.key" -out "${key}.pem" + openssl x509 -outform DER -in "${key}.pem" -out "${key}.der" + sbsiglist --owner "${uuid}" --type x509 --output "${key}.esl" "${key}.der" +done + +# See also: <ulink url="https://learn.microsoft.com/en-us/windows-hardware/manufacture/desktop/windows-secure-boot-key-creation-and-management-guidance">Windows Secure Boot Key Creation and Management Guidance</ulink> +curl --location \ + "https://go.microsoft.com/fwlink/p/?linkid=321192" -o ms-db-2011.der \ + "https://go.microsoft.com/fwlink/p/?linkid=321185" -o ms-kek-2011.der \ + "https://go.microsoft.com/fwlink/p/?linkid=321194" -o ms-uefi-db-2011.der \ + "https://go.microsoft.com/fwlink/p/?linkid=2239776" -o ms-db-2023.der \ + "https://go.microsoft.com/fwlink/p/?linkid=2239775" -o ms-kek-2023.der \ + "https://go.microsoft.com/fwlink/p/?linkid=2239872" -o ms-uefi-db-2023.der +sha1sum -c <<END +580a6f4cc4e4b669b9ebdc1b2b3e087b80d0678d ms-db-2011.der +31590bfd89c9d74ed087dfac66334b3931254b30 ms-kek-2011.der +46def63b5ce61cf8ba0de2e6639c1019d0ed14f3 ms-uefi-db-2011.der +45a0fa32604773c82433c3b7d59e7466b3ac0c67 ms-db-2023.der +459ab6fb5e284d272d5e3e6abc8ed663829d632b ms-kek-2023.der +b5eeb4a6706048073f0ed296e7f580a790b59eaa ms-uefi-db-2023.der +END +for key in ms-*.der; do + sbsiglist --owner 77fa9abd-0359-4d32-bd60-28f4e78f784b --type x509 --output "${key%der}esl" "${key}" +done + +# Optionally add Microsoft Windows certificates (needed to boot into Windows). +cat ms-db-*.esl >>db.esl + +# Optionally add Microsoft UEFI certificates for firmware drivers / option ROMs and third-party +# boot loaders (including shim). This is highly recommended on real hardware as not including this +# may soft-brick your device (see next paragraph). +cat ms-uefi-*.esl >>db.esl + +# Optionally add Microsoft KEK certificates. Recommended if either of the Microsoft keys is used as +# the official UEFI revocation database is signed with this key. The revocation database can be +# updated with <citerefentry project='man-pages'><refentrytitle>fwupdmgr</refentrytitle><manvolnum>1</manvolnum></citerefentry>. +cat ms-kek-*.esl >>KEK.esl + +attr=NON_VOLATILE,RUNTIME_ACCESS,BOOTSERVICE_ACCESS,TIME_BASED_AUTHENTICATED_WRITE_ACCESS +sbvarsign --attr "${attr}" --key PK.key --cert PK.pem --output PK.auth PK PK.esl +sbvarsign --attr "${attr}" --key PK.key --cert PK.pem --output KEK.auth KEK KEK.esl +sbvarsign --attr "${attr}" --key KEK.key --cert KEK.pem --output db.auth db db.esl + </programlisting> + + <para>This feature is considered dangerous because even if all the required files are signed with the + keys being loaded, some files necessary for the system to function properly still won't be. This + is especially the case with Option ROMs (e.g. for storage controllers or graphics cards). See + <ulink url="https://github.com/Foxboron/sbctl/wiki/FAQ#option-rom">Secure Boot and Option ROMs</ulink> + for more details.</para> + + <xi:include href="version-info.xml" xpointer="v252"/></listitem> + </varlistentry> + + <varlistentry> + <term>reboot-for-bitlocker</term> + + <listitem><para>Caveat: This feature is experimental, and is likely to be changed (or removed in its + current form) in a future version of systemd.</para> + + <para>Work around BitLocker requiring a recovery key when the boot loader was + updated (disabled by default).</para> + + <para>Try to detect BitLocker encrypted drives along with an active TPM. If both are found and + Windows Boot Manager is selected in the boot menu, set the <literal>BootNext</literal> EFI variable + and restart the system. The firmware will then start Windows Boot Manager directly, leaving the TPM + PCRs in expected states so that Windows can unseal the encryption key. This allows + <citerefentry><refentrytitle>systemd-boot</refentrytitle><manvolnum>7</manvolnum></citerefentry> to + be updated without having to provide the recovery key for BitLocker drive unlocking.</para> + + <para>Note that the PCRs that Windows uses can be configured with the + <literal>Configure TPM platform validation profile for native UEFI firmware configurations</literal> + group policy under <literal>Computer Configuration\Administrative Templates\Windows Components\BitLocker Drive Encryption</literal>. + When Secure Boot is enabled, changing this to PCRs <literal>0,2,7,11</literal> should be safe. + The TPM key protector needs to be removed and then added back for the PCRs on an already + encrypted drive to change. If PCR 4 is not measured, this setting can be disabled to speed + up booting into Windows.</para> + + <xi:include href="version-info.xml" xpointer="v251"/></listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Example</title> + + <programlisting># /boot/efi/loader/loader.conf +timeout 0 +default 01234567890abcdef1234567890abdf0-* +editor no + </programlisting> + + <para>The menu will not be shown by default (the menu can still be shown by + pressing and holding a key during boot). One of the entries with files with a + name starting with <literal>01234567890abcdef1234567890abdf0-</literal> will be + selected by default. If more than one entry matches, the one with the highest + priority will be selected (generally the one with the highest version number). + The editor will be disabled, so it is not possible to alter the kernel command + line.</para> + </refsect1> + + <refsect1> + <title>See Also</title> + <para> + <citerefentry><refentrytitle>systemd-boot</refentrytitle><manvolnum>7</manvolnum></citerefentry>, + <citerefentry><refentrytitle>bootctl</refentrytitle><manvolnum>1</manvolnum></citerefentry> + </para> + </refsect1> +</refentry> |