units: measure additional phases into PCR 11 when entering storage target mode or factory reset (#36543)

Let's "spoil" access to TPM secrets when we boot into these two modes.
This matters in particular for storagetm: if the host gets exploited
while booted into storage target mode any secrets kept by the TPM might
remain accessible otherwise. By measuring a new "phase" word into PCR 11
we "blow the fuse" however on this boot.

units/meson.build

@@ -532,6 +532,11 @@ units = [
           'conditions' : ['ENABLE_BOOTLOADER', 'HAVE_OPENSSL', 'HAVE_TPM2'],
           'symlinks' : ['sysinit.target.wants/'],
         },
+        {
+          'file' : 'systemd-pcrphase-factory-reset.service.in',
+          'conditions' : ['ENABLE_BOOTLOADER', 'HAVE_OPENSSL', 'HAVE_TPM2'],
+          'symlinks' : ['factory-reset.target.wants/'],
+        },
         {
           'file' : 'systemd-pcrphase-initrd.service.in',
           'conditions' : ['ENABLE_BOOTLOADER', 'HAVE_OPENSSL', 'HAVE_TPM2', 'ENABLE_INITRD'],
@@ -542,6 +547,11 @@ units = [
           'conditions' : ['ENABLE_BOOTLOADER', 'HAVE_OPENSSL', 'HAVE_TPM2'],
           'symlinks' : ['sysinit.target.wants/'],
         },
+        {
+          'file' : 'systemd-pcrphase-storage-target-mode.service.in',
+          'conditions' : ['ENABLE_BOOTLOADER', 'HAVE_OPENSSL', 'HAVE_TPM2'],
+          'symlinks' : ['storage-target-mode.target.wants/'],
+        },
         {
           'file' : 'systemd-pcrphase.service.in',
           'conditions' : ['ENABLE_BOOTLOADER', 'HAVE_OPENSSL', 'HAVE_TPM2'],

units/systemd-pcrphase-factory-reset.service.in

@@ -0,0 +1,22 @@
+#  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 Barrier (Factory Reset)
+Documentation=man:systemd-pcrphase-factory-reset.service(8)
+DefaultDependencies=no
+Conflicts=shutdown.target
+After=tpm2.target
+Before=shutdown.target factory-reset.target
+ConditionSecurity=measured-uki
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart={{LIBEXECDIR}}/systemd-pcrextend --graceful factory-reset

units/systemd-pcrphase-storage-target-mode.service.in

@@ -0,0 +1,24 @@
+#  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 Barrier (Storage Target Mode)
+Documentation=man:systemd-pcrphase-storage-target-mode.service(8)
+DefaultDependencies=no
+Conflicts=shutdown.target
+After=tpm2.target
+Before=shutdown.target
+ConditionPathExists=/etc/initrd-release
+ConditionSecurity=measured-uki
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart={{LIBEXECDIR}}/systemd-pcrextend --graceful storage-target-mode-start
+ExecStop={{LIBEXECDIR}}/systemd-pcrextend --graceful storage-target-mode-stop

units/systemd-storagetm.service.in

@@ -13,7 +13,7 @@ Documentation=man:systemd-storagetm.service(8)
 ConditionVirtualization=!container
 DefaultDependencies=no
 Wants=modprobe@nvmet_tcp.service modprobe@thunderbolt_net.service sys-kernel-config.mount
-After=modprobe@nvmet_tcp.service modprobe@thunderbolt_net.service sys-kernel-config.mount plymouth-start.service
+After=modprobe@nvmet_tcp.service modprobe@thunderbolt_net.service sys-kernel-config.mount plymouth-start.service systemd-pcrphase-storage-target-mode.service
 Conflicts=shutdown.target
 Before=shutdown.target
 FailureAction=reboot