'\" t
.TH "SYSTEMD\&.PCRLOCK" "5" "" "systemd 255" "systemd.pcrlock"
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.SH "NAME"
systemd.pcrlock, systemd.pcrlock.d \- PCR measurement prediction files
.SH "SYNOPSIS"
.PP
.nf
/etc/pcrlock\&.d/*\&.pcrlock
/etc/pcrlock\&.d/*\&.pcrlock\&.d/*\&.pcrlock
/run/pcrlock\&.d/*\&.pcrlock
/run/pcrlock\&.d/*\&.pcrlock\&.d/*\&.pcrlock
/var/lib/pcrlock\&.d/*\&.pcrlock
/var/lib/pcrlock\&.d/*\&.pcrlock\&.d/*\&.pcrlock
/usr/local/pcrlock\&.d/*\&.pcrlock
/usr/local/pcrlock\&.d/*\&.pcrlock\&.d/*\&.pcrlock
/usr/lib/pcrlock\&.d/*\&.pcrlock
/usr/lib/pcrlock\&.d/*\&.pcrlock\&.d/*\&.pcrlock
.fi
.SH "DESCRIPTION"
.PP
*\&.pcrlock
files define expected TPM2 PCR measurements of components involved in the boot process\&.
\fBsystemd-pcrlock\fR(1)
uses such pcrlock files to analyze and predict TPM2 PCR measurements\&. The pcrlock files are JSON arrays that follow a subset of the
\m[blue]\fBTCG Common Event Log Format (CEL\-JSON)\fR\m[]\&\s-2\u[1]\d\s+2
specification\&. Specifically the
"recnum",
"content", and
"content_type"
record fields are not used and ignored if present\&. Each pcrlock file defines one set of expected, ordered PCR measurements of a specific component of the boot\&.
.PP
*\&.pcrlock files may be placed in various
\&.d/
drop\-in directories (see above for a full list)\&. All matching files discovered in these directories are sorted alphabetically by their file name (without taking the actual directory they were found in into account): pcrlock files with alphabetically earlier names are expected to cover measurements done before those with alphabetically later names\&. In order to make positioning pcrlock files in the boot process convenient the files are expected (by convention, this is not enforced) to be named
"\fINNN\fR\-\fIcomponent\fR\&.pcrlock"
(where
\fINNN\fR
is a three\-digit decimal number), for example
750\-enter\-initrd\&.pcrlock\&.
.PP
For various components of the boot process more than one alternative pcrlock file shall be supported (i\&.e\&. "variants")\&. For example to cover multiple kernels installed in parallel in the access policy, or multiple versions of the boot loader\&. This can be done by placing
*\&.pcrlock\&.d/*\&.pcrlock
in the drop\-in dirs, i\&.e\&. a common directory for a specific component, that contains one or more pcrlock files each covering one
\fIvariant\fR
of the component\&. Example:
650\-kernel\&.pcrlock\&.d/6\&.5\&.5\-200\&.fc38\&.x86_64\&.pcrlock
and
650\-kernel\&.pcrlock\&.d/6\&.5\&.7\-100\&.fc38\&.x86_64\&.pcrlock
.PP
Use
\fBsystemd\-pcrlock list\-components\fR
to list all pcrlock files currently installed\&.
.PP
Use the various
\fBlock\-*\fR
commands of
\fBsystemd\-pcrlock\fR
to automatically generate suitable pcrlock files for various types of resources\&.
.SH "WELL\-KNOWN COMPONENTS"
.PP
Components of the boot process may be defined freely by the administrator or OS vendor\&. The following components are well\-known however, and are defined by systemd\&. The list below is useful for ordering local pcrlock files properly against these components of the boot\&.
.PP
240\-secureboot\-policy\&.pcrlock
.RS 4
The SecureBoot policy, as recorded to PCR 7\&. May be generated via
\fBsystemd\-pcrlock lock\-secureboot\-policy\fR\&.
.sp
Added in version 255\&.
.RE
.PP
250\-firmware\-code\-early\&.pcrlock
.RS 4
Firmware code measurements, as recorded to PCR 0 and 2, up to the separator measurement (see
400\-secureboot\-separator\&.pcrlock\&.
below)\&. May be generated via
\fBsystemd\-pcrlock lock\-firmware\-code\fR\&.
.sp
Added in version 255\&.
.RE
.PP
250\-firmware\-config\-early\&.pcrlock
.RS 4
Firmware configuration measurements, as recorded to PCR 1 and 3, up to the separator measurement (see
400\-secureboot\-separator\&.pcrlock\&.
below)\&. May be generated via
\fBsystemd\-pcrlock lock\-firmware\-config\fR\&.
.sp
Added in version 255\&.
.RE
.PP
350\-action\-efi\-application\&.pcrlock
.RS 4
The EFI "Application" measurement done once by the firmware\&. Statically defined\&.
.sp
Added in version 255\&.
.RE
.PP
400\-secureboot\-separator\&.pcrlock
.RS 4
The EFI "separator" measurement on PCR 7 done once by the firmware to indicate where firmware control transitions into boot loader/OS control\&. Statically defined\&.
.sp
Added in version 255\&.
.RE
.PP
500\-separator\&.pcrlock
.RS 4
The EFI "separator" measurements on PCRs 0\-6 done once by the firmware to indicate where firmware control transitions into boot loader/OS control\&. Statically defined\&.
.sp
Added in version 255\&.
.RE
.PP
550\-firmware\-code\-late\&.pcrlock
.RS 4
Firmware code measurements, as recorded to PCR 0 and 2, after the separator measurement (see
400\-secureboot\-separator\&.pcrlock\&.
above)\&. May be generated via
\fBsystemd\-pcrlock lock\-firmware\-code\fR\&.
.sp
Added in version 255\&.
.RE
.PP
550\-firmware\-config\-late\&.pcrlock
.RS 4
Firmware configuration measurements, as recorded to PCR 1 and 3, after the separator measurement (see
400\-secureboot\-separator\&.pcrlock\&.
above)\&. May be generated via
\fBsystemd\-pcrlock lock\-firmware\-config\fR\&.
.sp
Added in version 255\&.
.RE
.PP
600\-gpt\&.pcrlock
.RS 4
The GPT partition table of the booted medium, as recorded to PCR 5 by the firmware\&. May be generated via
\fBsystemd\-pcrlock lock\-gpt\fR\&.
.sp
Added in version 255\&.
.RE
.PP
620\-secureboot\-authority\&.pcrlock
.RS 4
The SecureBoot authority, as recorded to PCR 7\&. May be generated via
\fBsystemd\-pcrlock lock\-secureboot\-authority\fR\&.
.sp
Added in version 255\&.
.RE
.PP
700\-action\-efi\-exit\-boot\-services\&.pcrlock
.RS 4
The EFI action generated when
\fBExitBootServices()\fR
is generated, i\&.e\&. the UEFI environment is left and the OS takes over\&. Covers the PCR 5 measurement\&. Statically defined\&.
.sp
Added in version 255\&.
.RE
.PP
710\-kernel\-cmdline\&.pcrlock
.RS 4
The kernel command line, as measured by the Linux kernel to PCR 9\&. May be generated via
\fBsystemd\-pcrlock lock\-kernel\-cmdline\fR\&.
.sp
Added in version 255\&.
.RE
.PP
720\-kernel\-initrd\&.pcrlock
.RS 4
The kernel initrd, as measured by the Linux kernel to PCR 9\&. May be generated via
\fBsystemd\-pcrlock lock\-kernel\-initrd\fR\&.
.sp
Added in version 255\&.
.RE
.PP
750\-enter\-initrd\&.pcrlock
.RS 4
The measurement to PCR 11
\fBsystemd-pcrphase-initrd.service\fR(8)
makes when the initrd initializes\&. Statically defined\&.
.sp
Added in version 255\&.
.RE
.PP
800\-leave\-initrd\&.pcrlock
.RS 4
The measurement to PCR 11
\fBsystemd-pcrphase-initrd.service\fR(8)
makes when the initrd finishes\&. Statically defined\&.
.sp
Added in version 255\&.
.RE
.PP
820\-machine\-id\&.pcrlock
.RS 4
The measurement to PCR 15
\fBsystemd-pcrmachine.service\fR(8)
makes at boot, covering
/etc/machine\-id
contents\&. May be generated via
\fBsystemd\-pcrlock lock\-machine\-id\fR\&.
.sp
Added in version 255\&.
.RE
.PP
830\-root\-file\-system\&.pcrlock
.RS 4
The measurement to PCR 15
\fBsystemd-pcrfs-root.service\fR(8)
makes at boot, covering the root file system identity\&. May be generated via
\fBsystemd\-pcrlock lock\-file\-system\fR\&.
.sp
Added in version 255\&.
.RE
.PP
850\-sysinit\&.pcrlock
.RS 4
The measurement to PCR 11
\fBsystemd-pcrphase-sysinit.service\fR(8)
makes when the main userspace did basic initialization and will now proceed to start regular system services\&. Statically defined\&.
.sp
Added in version 255\&.
.RE
.PP
900\-ready\&.pcrlock
.RS 4
The measurement to PCR 11
\fBsystemd-pcrphase.service\fR(8)
makes when the system fully booted up\&. Statically defined\&.
.sp
Added in version 255\&.
.RE
.PP
950\-shutdown\&.pcrlock
.RS 4
The measurement to PCR 11
\fBsystemd-pcrphase.service\fR(8)
makes when the system begins shutdown\&. Statically defined\&.
.sp
Added in version 255\&.
.RE
.PP
990\-final\&.pcrlock
.RS 4
The measurement to PCR 11
\fBsystemd-pcrphase-sysinit.service\fR(8)
makes when the system is close to finishing shutdown\&. Statically defined\&.
.sp
Added in version 255\&.
.RE
.SH "SEE ALSO"
.PP
\fBsystemd\fR(1),
\fBsystemd-pcrlock\fR(1)
.SH "NOTES"
.IP " 1." 4
TCG Common Event Log Format (CEL-JSON)
.RS 4
\%https://trustedcomputinggroup.org/resource/canonical-event-log-format/
.RE