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49 lines
2.7 KiB
49 lines
2.7 KiB
8 months ago
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From 9a7d568845164a5d9621a2028c4a8333928e2e2a Mon Sep 17 00:00:00 2001
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From: Dan Streetman <ddstreet@ieee.org>
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Date: Fri, 14 Jul 2023 18:36:20 -0400
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Subject: [PATCH] man: update systemd-cryptenroll man page with details on
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--tpm2-pcrs format change
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The previous commit extended the accepted format of --tpm2-pcrs to allow
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specifying the hash algorithm (i.e. PCR bank) and hash digest value, this
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updates the man page with those changes.
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(cherry picked from commit 1782b0b88ce531a674102445cdf95f86e6b54cae)
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Related: RHEL-16182
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---
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man/systemd-cryptenroll.xml | 17 +++++++++++++----
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1 file changed, 13 insertions(+), 4 deletions(-)
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diff --git a/man/systemd-cryptenroll.xml b/man/systemd-cryptenroll.xml
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index 5ddaab40bc..3f36f320b6 100644
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--- a/man/systemd-cryptenroll.xml
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+++ b/man/systemd-cryptenroll.xml
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@@ -379,13 +379,22 @@
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<term><option>--tpm2-pcrs=</option><arg rep="repeat">PCR</arg></term>
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<listitem><para>Configures the TPM2 PCRs (Platform Configuration Registers) to bind to when
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- enrollment is requested via <option>--tpm2-device=</option>. Takes a list of PCR names or numeric
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- indices in the range 0…23. Multiple PCR indexes are separated by <literal>+</literal>. If not
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- specified, the default is to use PCR 7 only. If an empty string is specified, binds the enrollment to
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- no PCRs at all. See the table above for a list of available PCRs.</para>
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+ enrollment is requested via <option>--tpm2-device=</option>. Takes a list of PCR entries, where each
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+ entry starts with a name or numeric index in the range 0…23, optionally followed by
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+ <literal>:</literal> and a hash algorithm name (specifying the PCR bank), optionally followed by
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+ <literal>=</literal> and a hash digest value. Multiple PCR entries are separated by
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+ <literal>+</literal>. If not specified, the default is to use PCR 7 only. If an empty string is
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+ specified, binds the enrollment to no PCRs at all. See the table above for a list of available
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+ PCRs.</para>
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<para>Example: <option>--tpm2-pcrs=boot-loader-code+platform-config+boot-loader-config</option>
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specifies that PCR registers 4, 1, and 5 should be used.</para>
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+ <para>Example: <option>--tpm2-pcrs=7:sha256</option> specifies that PCR register 7 from the SHA256
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+ bank should be used.</para>
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+ <para>Example: <option>--tpm2-pcrs=4:sha1=0x3A3F780F11A4B49969FCAA80CD6E3957C33B2275</option>
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+ specifies that PCR register 4 from the SHA1 bank should be used, and a hash digest value of
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+ 0x3A3F780F11A4B49969FCAA80CD6E3957C33B2275 will be used instead of reading the current PCR
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+ value.</para>
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</listitem>
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</varlistentry>
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