# systemd.pcrlock

## NAME



           systemd.pcrlock, systemd.pcrlock.d - PCR measurement prediction
           files
    


## SYNOPSIS



               /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
    


## DESCRIPTION



           *.pcrlock files define expected TPM2 PCR measurements of
           components involved in the boot process.  systemd-pcrlock(8) uses
           such pcrlock files to analyze and predict TPM2 PCR measurements.
           The pcrlock files are JSON arrays that follow a subset of the **TCG**
           **Canonical Event Log Format (CEL-JSON)******[1] 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.
    
           *.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
           "_NNN_ -_component_.pcrlock" (where _NNN_ is a three-digit decimal
           number), for example 750-enter-initrd.pcrlock.
    
           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 _variant_ 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
    
           Use **systemd-pcrlock list-components** to list all pcrlock files
           currently installed.
    
           Use the various **lock-*** commands of **systemd-pcrlock** to
           automatically generate suitable pcrlock files for various types of
           resources.
    


## WELL-KNOWN COMPONENTS



           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.
    
           240-secureboot-policy.pcrlock
               The SecureBoot policy, as recorded to PCR 7. May be generated
               via **systemd-pcrlock lock-secureboot-policy**.
    
               Added in version 255.
    
           250-firmware-code-early.pcrlock
               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
               **systemd-pcrlock lock-firmware-code**.
    
               Added in version 255.
    
           250-firmware-config-early.pcrlock
               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
               **systemd-pcrlock lock-firmware-config**.
    
               Added in version 255.
    
           350-action-efi-application.pcrlock
               The EFI "Application" measurement done once by the firmware.
               Statically defined.
    
               Added in version 255.
    
           400-secureboot-separator.pcrlock
               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.
    
               Added in version 255.
    
           500-separator.pcrlock
               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.
    
               Added in version 255.
    
           550-firmware-code-late.pcrlock
               Firmware code measurements, as recorded to PCR 0 and 2, after
               the separator measurement (see
               400-secureboot-separator.pcrlock above). May be generated via
               **systemd-pcrlock lock-firmware-code**.
    
               Added in version 255.
    
           550-firmware-config-late.pcrlock
               Firmware configuration measurements, as recorded to PCR 1 and
               3, after the separator measurement (see
               400-secureboot-separator.pcrlock above). May be generated via
               **systemd-pcrlock lock-firmware-config**.
    
               Added in version 255.
    
           600-gpt.pcrlock
               The GPT partition table of the booted medium, as recorded to
               PCR 5 by the firmware. May be generated via **systemd-pcrlock**
               **lock-gpt**.
    
               Added in version 255.
    
           620-secureboot-authority.pcrlock
               The SecureBoot authority, as recorded to PCR 7. May be
               generated via **systemd-pcrlock lock-secureboot-authority**.
    
               Added in version 255.
    
           700-action-efi-exit-boot-services.pcrlock
               The EFI action generated when **ExitBootServices()** is generated,
               i.e. when the UEFI environment is left and the OS takes over.
               Covers the PCR 5 measurement. Statically defined.
    
               Added in version 255.
    
           710-kernel-cmdline.pcrlock
               The kernel command line, as measured by the Linux kernel to
               PCR 9. May be generated via **systemd-pcrlock**
               **lock-kernel-cmdline**.
    
               Added in version 255.
    
           720-kernel-initrd.pcrlock
               The kernel initrd, as measured by the Linux kernel to PCR 9.
               May be generated via **systemd-pcrlock lock-kernel-initrd**.
    
               Added in version 255.
    
           750-enter-initrd.pcrlock
               The measurement to PCR 11 systemd-pcrphase-initrd.service(8)
               makes when the initrd initializes. Statically defined.
    
               Added in version 255.
    
           800-leave-initrd.pcrlock
               The measurement to PCR 11 systemd-pcrphase-initrd.service(8)
               makes when the initrd finishes. Statically defined.
    
               Added in version 255.
    
           820-machine-id.pcrlock
               The measurement to PCR 15 systemd-pcrmachine.service(8) makes
               at boot, covering /etc/machine-id contents. May be generated
               via **systemd-pcrlock lock-machine-id**.
    
               Added in version 255.
    
           830-root-file-system.pcrlock
               The measurement to PCR 15 systemd-pcrfs-root.service(8) makes
               at boot, covering the root file system identity. May be
               generated via **systemd-pcrlock lock-file-system**.
    
               Added in version 255.
    
           850-sysinit.pcrlock
               The measurement to PCR 11 systemd-pcrphase-sysinit.service(8)
               makes when the main userspace did basic initialization and
               will now proceed to start regular system services. Statically
               defined.
    
               Added in version 255.
    
           900-ready.pcrlock
               The measurement to PCR 11 systemd-pcrphase.service(8) makes
               when the system fully booted up. Statically defined.
    
               Added in version 255.
    
           950-shutdown.pcrlock
               The measurement to PCR 11 systemd-pcrphase.service(8) makes
               when the system begins shutdown. Statically defined.
    
               Added in version 255.
    
           990-final.pcrlock
               The measurement to PCR 11 systemd-pcrphase-sysinit.service(8)
               makes when the system is close to finishing shutdown.
               Statically defined.
    
               Added in version 255.
    


## NOTES



            1. TCG Canonical Event Log Format (CEL-JSON)
               https://trustedcomputinggroup.org/resource/canonical-event-log-format/
    


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