systemd/units/systemd-pcrfs-root.service.in

#  SPDX-License-Identifier: LGPL-2.1-or-later
#
#  This file is part of systemd.
#
#  systemd is free software; you can redistribute it and/or modify it
#  under the terms of the GNU Lesser General Public License as published by
#  the Free Software Foundation; either version 2.1 of the License, or
#  (at your option) any later version.

[Unit]
Description=TPM PCR Root File System Measurement
Documentation=man:systemd-pcrfs-root.service(8)
DefaultDependencies=no
Conflicts=shutdown.target
After=tpm2.target systemd-pcrmachine.service
Before=shutdown.target
ConditionPathExists=!/etc/initrd-release
ConditionSecurity=measured-uki

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart={{LIBEXECDIR}}/systemd-pcrextend --graceful --file-system=/
generators: optionally, measure file systems at boot If we use gpt-auto-generator, automatically measure root fs and /var. Otherwise, add x-systemd.measure option to request this. 2022-10-16 21:25:04 +00:00			`# SPDX-License-Identifier: LGPL-2.1-or-later`
			`#`
			`# This file is part of systemd.`
			`#`
			`# systemd is free software; you can redistribute it and/or modify it`
			`# under the terms of the GNU Lesser General Public License as published by`
			`# the Free Software Foundation; either version 2.1 of the License, or`
			`# (at your option) any later version.`

			`[Unit]`
units: retitle systemd-pcrextend.{service,socket}, change TPM2→TPM I was looking at the logs in some bug and saw this: Mar 13 15:55:12 fedora systemd[1]: systemd-pcrmachine.service - TPM2 PCR Machine ID Measurement was skipped because of an unmet condition check (ConditionSecurity=measured-uki). Mar 13 15:55:12 fedora systemd[1]: Starting systemd-remount-fs.service - Remount Root and Kernel File Systems... Mar 13 15:55:12 fedora systemd[1]: systemd-tpm2-setup-early.service - TPM2 SRK Setup (Early) was skipped because of an unmet condition check (ConditionSecurity=measured-uki). This is overly technical, for most units we don't provide this level of detail about the implementation. So retitle the units to be more accessible. Also, the fact that it's a v. 2 of the TPM is not that important. We don't support TPM 1.2, but computers without TPM v2 are getting rare. For other units we don't advertise the version of hardware, and let's not do this here, to reduce some complexity. 2024-03-13 21:18:13 +00:00			`Description=TPM PCR Root File System Measurement`
generators: optionally, measure file systems at boot If we use gpt-auto-generator, automatically measure root fs and /var. Otherwise, add x-systemd.measure option to request this. 2022-10-16 21:25:04 +00:00			`Documentation=man:systemd-pcrfs-root.service(8)`
			`DefaultDependencies=no`
			`Conflicts=shutdown.target`
units: add a tpm2.target synchronization point and small generator that pulls in Distributions apparently only compile a subset of TPM2 drivers into the kernel. For those not compiled it but provided as kmod we need a synchronization point: we must wait before the first TPM2 interaction until the driver is available and accessible. This adds a tpm2.target unit as such a synchronization point. It's ordered after /dev/tpmrm0, and is pulled in by a generator whenever we detect that the kernel reported a TPM2 to exist but we have no device for it yet. This should solve the issue, but might create problems: if there are TPM devices supported by firmware that we don't have Linux drivers for we'll hang for a bit. Hence let's add a kernel cmdline switch to disable (or alternatively force) this logic. Fixes: #30164 2023-11-24 17:01:56 +00:00			`After=tpm2.target systemd-pcrmachine.service`
generators: optionally, measure file systems at boot If we use gpt-auto-generator, automatically measure root fs and /var. Otherwise, add x-systemd.measure option to request this. 2022-10-16 21:25:04 +00:00			`Before=shutdown.target`
units: change assert to condition to skip running in initrd/os These units are also present in the initrd, so instead of an assert, just use a condition so they are skipped where they need to be skipped. Fixes https://github.com/systemd/systemd/issues/26358 2023-02-08 23:06:27 +00:00			`ConditionPathExists=!/etc/initrd-release`
units: move units over to ConditionSecurity=measured-uki 2023-09-27 10:13:26 +00:00			`ConditionSecurity=measured-uki`
generators: optionally, measure file systems at boot If we use gpt-auto-generator, automatically measure root fs and /var. Otherwise, add x-systemd.measure option to request this. 2022-10-16 21:25:04 +00:00
			`[Service]`
			`Type=oneshot`
			`RemainAfterExit=yes`
pcrphase: rename binary to pcrextend The tool initially just measured the boot phase, but was subsequently extended to measure file system and machine IDs, too. At AllSystemsGo there were request to add more, and make the tool generically accessible. Hence, let's rename the binary (but not the pcrphase services), to make clear the tool is not just measureing the boot phase, but a lot of other things too. The tool is located in /usr/lib/ and still relatively new, hence let's just rename the binary and be done with it, while keeping the unit names stable. While we are at it, also move the tool out of src/boot/ and into its own src/pcrextend/ dir, since it's not really doing boot related stuff anymore. 2023-09-25 08:38:01 +00:00			`ExecStart={{LIBEXECDIR}}/systemd-pcrextend --graceful --file-system=/`