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54 lines
2.6 KiB
54 lines
2.6 KiB
6 months ago
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From 83d8729b090803f37208995ff3b97544d8ce5725 Mon Sep 17 00:00:00 2001
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From: Luca Boccassi <bluca@debian.org>
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Date: Wed, 8 Feb 2023 02:10:28 +0000
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Subject: [PATCH] cryptenroll: do not implicitly verify with default tpm policy
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signature
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If it was not requested to use a tpm2 signature file when enrolling, do
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not fallback to the default /run/systemd/tpm2-pcr-signature.json as it
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likely will be unrelated if it exists.
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Fixes https://github.com/systemd/systemd/issues/25435
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(cherry picked from commit b0fc23fae51d244d2c33d70c10003aa5d5840223)
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Related: RHEL-16182
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---
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src/cryptenroll/cryptenroll-tpm2.c | 5 +++--
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test/units/testsuite-70.sh | 6 ++++++
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2 files changed, 9 insertions(+), 2 deletions(-)
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diff --git a/src/cryptenroll/cryptenroll-tpm2.c b/src/cryptenroll/cryptenroll-tpm2.c
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index 98c45f42f6..d9de9aa96c 100644
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--- a/src/cryptenroll/cryptenroll-tpm2.c
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+++ b/src/cryptenroll/cryptenroll-tpm2.c
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@@ -198,8 +198,9 @@ int enroll_tpm2(struct crypt_device *cd,
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log_debug_errno(r, "Failed to read TPM2 PCR public key, proceeding without: %m");
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pubkey_pcr_mask = 0;
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- } else {
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- /* Also try to load the signature JSON object, to verify that our enrollment will work. This is optional however. */
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+ } else if (signature_path) {
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+ /* Also try to load the signature JSON object, to verify that our enrollment will work.
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+ * This is optional however, skip it if it's not explicitly provided. */
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r = tpm2_load_pcr_signature(signature_path, &signature_json);
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if (r < 0) {
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diff --git a/test/units/testsuite-70.sh b/test/units/testsuite-70.sh
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index 12b47f329c..9e42dd5b28 100755
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--- a/test/units/testsuite-70.sh
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+++ b/test/units/testsuite-70.sh
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@@ -225,6 +225,12 @@ if [ -e /usr/lib/systemd/systemd-measure ] && \
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# Now, do the same, but with a cryptsetup binding
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truncate -s 20M $img
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cryptsetup luksFormat -q --pbkdf pbkdf2 --pbkdf-force-iterations 1000 --use-urandom $img /tmp/passphrase
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+ # Ensure that an unrelated signature, when not requested, is not used
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+ touch /run/systemd/tpm2-pcr-signature.json
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+ systemd-cryptenroll --unlock-key-file=/tmp/passphrase --tpm2-device=auto --tpm2-public-key="/tmp/pcrsign-public.pem" $img
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+ # Reset and use the signature now
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+ rm -f /run/systemd/tpm2-pcr-signature.json
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+ systemd-cryptenroll --wipe-slot=tpm2 $img
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systemd-cryptenroll --unlock-key-file=/tmp/passphrase --tpm2-device=auto --tpm2-public-key="/tmp/pcrsign-public.pem" --tpm2-signature="/tmp/pcrsign.sig2" $img
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# Check if we can activate that (without the token module stuff)
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