Lennart Poettering
056c21aaeb
For TPM-less systems it's sometimes valuable to have a fill-in software TPM running from early boot on, so that TPM-based functionality can "just work" and rely on TPM semantics, even if it's at a substantially weaker security level. This adds a wrapper around swtpm. It's a binary that chainloads swtpm but does a few preparatory steps and integrates into systemd's logic otherwise. All this is then exposed as systemd-tpm2-swtpm.service. The service is not hooked into much yet, that is added in later commits.
27 lines
914 B
Plaintext
27 lines
914 B
Plaintext
# SPDX-License-Identifier: LGPL-2.1-or-later
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#
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# This file is part of systemd.
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#
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# systemd is free software; you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 2.1 of the License, or
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# (at your option) any later version.
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[Unit]
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Description=Fallback Software TPM
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Documentation=man:systemd-tpm2-swtpm.service(8)
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DefaultDependencies=no
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After=systemd-sysusers.service
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Wants=modprobe@tpm_vtpm_proxy.service
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After=modprobe@tpm_vtpm_proxy.service
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Before=tpm2.target sysinit.target
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[Service]
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Type=notify
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RuntimeDirectory=systemd/swtpm
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ExecStart={{LIBEXECDIR}}/systemd-tpm2-swtpm
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# Write out volatile state (so that we can read it back after the initrd transition
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ExecStop=swtpm_ioctl --unix %t/systemd/swtpm/socket -v
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# Initiate graceful shutdown
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ExecStop=swtpm_ioctl --unix %t/systemd/swtpm/socket -s
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