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1 | <?xml version='1.0'?> <!--*-nxml-*--> |
2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" | |
3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> | |
4 | <!-- SPDX-License-Identifier: LGPL-2.1-or-later --> | |
5 | ||
dfca5587 | 6 | <refentry id="systemd-pcrphase.service" conditional='ENABLE_BOOTLOADER' |
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7 | xmlns:xi="http://www.w3.org/2001/XInclude"> |
8 | ||
9 | <refentryinfo> | |
10 | <title>systemd-pcrphase.service</title> | |
11 | <productname>systemd</productname> | |
12 | </refentryinfo> | |
13 | ||
14 | <refmeta> | |
15 | <refentrytitle>systemd-pcrphase.service</refentrytitle> | |
16 | <manvolnum>8</manvolnum> | |
17 | </refmeta> | |
18 | ||
19 | <refnamediv> | |
20 | <refname>systemd-pcrphase.service</refname> | |
047273e6 | 21 | <refname>systemd-pcrphase-sysinit.service</refname> |
708d7524 | 22 | <refname>systemd-pcrphase-initrd.service</refname> |
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23 | <refname>systemd-pcrmachine.service</refname> |
24 | <refname>systemd-pcrfs-root.service</refname> | |
25 | <refname>systemd-pcrfs@.service</refname> | |
708d7524 | 26 | <refname>systemd-pcrphase</refname> |
2bd33c90 | 27 | <refpurpose>Measure boot phase into TPM2 PCR 11, machine ID and file system identity into PCR 15</refpurpose> |
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28 | </refnamediv> |
29 | ||
30 | <refsynopsisdiv> | |
31 | <para><filename>systemd-pcrphase.service</filename></para> | |
15f9a152 | 32 | <para><filename>systemd-pcrphase-sysinit.service</filename></para> |
708d7524 | 33 | <para><filename>systemd-pcrphase-initrd.service</filename></para> |
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34 | <para><filename>systemd-pcrmachine.service</filename></para> |
35 | <para><filename>systemd-pcrfs-root.service</filename></para> | |
36 | <para><filename>systemd-pcrfs@.service</filename></para> | |
45ab6f2a | 37 | <para><filename>/usr/lib/systemd/systemd-pcrphase</filename> <optional><replaceable>STRING</replaceable></optional></para> |
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38 | </refsynopsisdiv> |
39 | ||
40 | <refsect1> | |
41 | <title>Description</title> | |
42 | ||
047273e6 | 43 | <para><filename>systemd-pcrphase.service</filename>, |
86a06615 | 44 | <filename>systemd-pcrphase-sysinit.service</filename>, and |
708d7524 | 45 | <filename>systemd-pcrphase-initrd.service</filename> are system services that measure specific strings |
047273e6 | 46 | into TPM2 PCR 11 during boot at various milestones of the boot process.</para> |
708d7524 | 47 | |
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48 | <para><filename>systemd-pcrmachine.service</filename> is a system service that measures the machine ID |
49 | (see <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>) into | |
50 | PCR 15.</para> | |
51 | ||
52 | <para><filename>systemd-pcrfs-root.service</filename> and <filename>systemd-pcrfs@.service</filename> are | |
53 | services that measure file system identity information (i.e. mount point, file system type, label and | |
54 | UUID, partition label and UUID) into PCR 15. <filename>systemd-pcrfs-root.service</filename> does so for | |
55 | the root file system, <filename>systemd-pcrfs@.service</filename> is a template unit that measures the | |
56 | file system indicated by its instance identifier instead.</para> | |
57 | ||
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58 | <para>These services require |
59 | <citerefentry><refentrytitle>systemd-stub</refentrytitle><manvolnum>7</manvolnum></citerefentry> to be | |
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60 | used in a unified kernel image (UKI). They execute no operation when the stub has not been used to invoke |
61 | the kernel. The stub will measure the invoked kernel and associated vendor resources into PCR 11 before | |
86a06615 | 62 | handing control to it; once userspace is invoked these services then will extend TPM2 PCR 11 with certain |
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63 | literal strings indicating phases of the boot process. During a regular boot process PCR 11 is extended |
64 | with the following strings:</para> | |
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65 | |
66 | <orderedlist> | |
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67 | <listitem><para><literal>enter-initrd</literal> — early when the initrd initializes, before activating |
68 | system extension images for the initrd. It acts as a barrier between the time where the kernel | |
69 | initializes and where the initrd starts operating and enables system extension images, i.e. code | |
70 | shipped outside of the UKI. (This extension happens when | |
71 | <filename>systemd-pcrphase-initrd.service</filename> is started.)</para></listitem> | |
72 | ||
73 | <listitem><para><literal>leave-initrd</literal> — when the initrd is about to transition into the host | |
74 | file system. It acts as barrier between initrd code and host OS code. (This extension happens when | |
75 | <filename>systemd-pcrphase-initrd.service</filename> is stopped.)</para></listitem> | |
76 | ||
77 | <listitem><para><literal>sysinit</literal> — when basic system initialization is complete (which | |
78 | includes local file systems having been mounted), and the system begins starting regular system | |
79 | services. (This extension happens when <filename>systemd-pcrphase-sysinit.service</filename> is | |
80 | started.)</para></listitem> | |
81 | ||
82 | <listitem><para><literal>ready</literal> — during later boot-up, after remote file systems have been | |
83 | activated (i.e. after <filename>remote-fs.target</filename>), but before users are permitted to log in | |
84 | (i.e. before <filename>systemd-user-sessions.service</filename>). It acts as barrier between the time | |
85 | where unprivileged regular users are still prohibited to log in and where they are allowed to log in. | |
86 | (This extension happens when <filename>systemd-pcrphase.service</filename> is started.) | |
87 | </para></listitem> | |
88 | ||
89 | <listitem><para><literal>shutdown</literal> — when the system shutdown begins. It acts as barrier | |
90 | between the time the system is fully up and running and where it is about to shut down. (This extension | |
91 | happens when <filename>systemd-pcrphase.service</filename> is stopped.)</para></listitem> | |
92 | ||
93 | <listitem><para><literal>final</literal> — at the end of system shutdown. It acts as barrier between | |
94 | the time the service manager still runs and when it transitions into the final shutdown phase where | |
95 | service management is not available anymore. (This extension happens when | |
96 | <filename>systemd-pcrphase-sysinit.service</filename> is stopped.)</para></listitem> | |
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97 | </orderedlist> |
98 | ||
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99 | <para>During a regular system lifecycle, PCR 11 is extended with the strings |
100 | <literal>enter-initrd</literal>, <literal>leave-initrd</literal>, <literal>sysinit</literal>, | |
101 | <literal>ready</literal>, <literal>shutdown</literal>, and <literal>final</literal>.</para> | |
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102 | |
103 | <para>Specific phases of the boot process may be referenced via the series of strings measured, separated | |
86a06615 | 104 | by colons (the "phase path"). For example, the phase path for the regular system runtime is |
047273e6 | 105 | <literal>enter-initrd:leave-initrd:sysinit:ready</literal>, while the one for the initrd is just |
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106 | <literal>enter-initrd</literal>. The phase path for the boot phase before the initrd is an empty string; |
107 | because that's hard to pass around a single colon (<literal>:</literal>) may be used instead. Note that | |
108 | the aforementioned six strings are just the default strings and individual systems might measure other | |
109 | strings at other times, and thus implement different and more fine-grained boot phases to bind policy | |
110 | to.</para> | |
708d7524 | 111 | |
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112 | <para>By binding policy of TPM2 objects to a specific phase path it is possible to restrict access to |
113 | them to specific phases of the boot process, for example making it impossible to access the root file | |
114 | system's encryption key after the system transitioned from the initrd into the host root file system. | |
115 | </para> | |
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116 | |
117 | <para>Use | |
118 | <citerefentry><refentrytitle>systemd-measure</refentrytitle><manvolnum>1</manvolnum></citerefentry> to | |
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119 | pre-calculate expected PCR 11 values for specific boot phases (via the <option>--phase=</option> switch). |
120 | </para> | |
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121 | |
122 | <para><filename>systemd-pcrfs-root.service</filename> and <filename>systemd-pcrfs@.service</filename> are | |
123 | automatically pulled into the initial transaction by | |
f37f0f35 | 124 | <citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry> |
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125 | for the root and <filename>/var/</filename> file |
126 | systems. <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
127 | will do this for all mounts with the <option>x-systemd.pcrfs</option> mount option in | |
128 | <filename>/etc/fstab</filename>.</para> | |
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129 | </refsect1> |
130 | ||
131 | <refsect1> | |
132 | <title>Options</title> | |
133 | ||
134 | <para>The <filename>/usr/lib/systemd/system-pcrphase</filename> executable may also be invoked from the | |
135 | command line, where it expects the word to extend into PCR 11, as well as the following switches:</para> | |
136 | ||
137 | <variablelist> | |
138 | <varlistentry> | |
139 | <term><option>--bank=</option></term> | |
140 | ||
141 | <listitem><para>Takes the PCR banks to extend the specified word into. If not specified the tool | |
142 | automatically determines all enabled PCR banks and measures the word into all of | |
143 | them.</para></listitem> | |
144 | </varlistentry> | |
145 | ||
146 | <varlistentry> | |
147 | <term><option>--tpm2-device=</option><replaceable>PATH</replaceable></term> | |
148 | ||
149 | <listitem><para>Controls which TPM2 device to use. Expects a device node path referring to the TPM2 | |
150 | chip (e.g. <filename>/dev/tpmrm0</filename>). Alternatively the special value <literal>auto</literal> | |
151 | may be specified, in order to automatically determine the device node of a suitable TPM2 device (of | |
152 | which there must be exactly one). The special value <literal>list</literal> may be used to enumerate | |
153 | all suitable TPM2 devices currently discovered.</para></listitem> | |
154 | </varlistentry> | |
155 | ||
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156 | <varlistentry> |
157 | <term><option>--graceful</option></term> | |
158 | ||
159 | <listitem><para>If no TPM2 firmware, kernel subsystem, kernel driver or device support is found, exit | |
160 | with exit status 0 (i.e. indicate success). If this is not specified any attempt to measure without a | |
161 | TPM2 device will cause the invocation to fail.</para></listitem> | |
162 | </varlistentry> | |
163 | ||
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164 | <varlistentry> |
165 | <term><option>--machine-id</option></term> | |
166 | ||
167 | <listitem><para>Instead of measuring a word specified on the command line into PCR 11, measure the | |
168 | host's machine ID into PCR 15.</para></listitem> | |
169 | </varlistentry> | |
170 | ||
171 | <varlistentry> | |
172 | <term><option>--file-system=</option></term> | |
173 | ||
174 | <listitem><para>Instead of measuring a word specified on the command line into PCR 11, measure | |
175 | identity information of the specified file system into PCR 15. The parameter must be the path to the | |
176 | established mount point of the file system to measure.</para></listitem> | |
177 | </varlistentry> | |
178 | ||
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179 | <xi:include href="standard-options.xml" xpointer="help" /> |
180 | <xi:include href="standard-options.xml" xpointer="version" /> | |
181 | ||
182 | </variablelist> | |
183 | </refsect1> | |
184 | ||
185 | <refsect1> | |
186 | <title>See Also</title> | |
187 | <para> | |
188 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
189 | <citerefentry><refentrytitle>systemd-stub</refentrytitle><manvolnum>7</manvolnum></citerefentry>, | |
2bd33c90 | 190 | <citerefentry><refentrytitle>systemd-measure</refentrytitle><manvolnum>1</manvolnum></citerefentry>, |
f37f0f35 | 191 | <citerefentry><refentrytitle>systemd-gpt-auto-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
2bd33c90 | 192 | <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry> |
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193 | </para> |
194 | </refsect1> | |
195 | ||
196 | </refentry> |