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test: check if we can use SHA1 MD for signing before using it

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Some distributions have started phasing out SHA1, which breaks
the systemd-measure test case in its current form. Let's make sure we
can use SHA1 for signing beforehand to mitigate this.

Spotted on RHEL 9, where SHA1 signatures are disallowed by [0]:
```
openssl genpkey -algorithm RSA -pkeyopt rsa_keygen_bits:2048 -out "/tmp/pcrsign-private.pem"
...
openssl rsa -pubout -in "/tmp/pcrsign-private.pem" -out "/tmp/pcrsign-public.pem"
writing RSA key
/usr/lib/systemd/systemd-measure sign --current --bank=sha1 --private-key="/tmp/pcrsign-private.pem" --public-key="/tmp/pcrsign-public.pem"
Failed to initialize signature context.
```

[0] https://gitlab.com/redhat/centos-stream/rpms/openssl/-/blob/c9s/0049-Selectively-disallow-SHA1-signatures.patch

(cherry picked from commit d19e5540f2)
This commit is contained in:
Frantisek Sumsal 2022-12-02 12:48:26 +01:00 committed by Zbigniew Jędrzejewski-Szmek
parent d0b80bf81e
commit 2a66b4c894
1 changed files with 12 additions and 3 deletions
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15
test/units/testsuite-70.sh
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@ -102,8 +102,17 @@ if [ -e /usr/lib/systemd/systemd-measure ] && \
openssl genpkey -algorithm RSA -pkeyopt rsa_keygen_bits:2048 -out "/tmp/pcrsign-private.pem"
openssl rsa -pubout -in "/tmp/pcrsign-private.pem" -out "/tmp/pcrsign-public.pem"
MEASURE_BANKS=("--bank=sha256")
# Check if SHA1 signatures are supported
#
# Some distros have started phasing out SHA1, so make sure the SHA1
# signatures are supported before trying to use them.
if echo hello | openssl dgst -sign /tmp/pcrsign-private.pem -sha1 >/dev/null; then
MEASURE_BANKS+=("--bank=sha1")
fi
# Sign current PCR state with it
/usr/lib/systemd/systemd-measure sign --current --bank=sha1 --bank=sha256 --private-key="/tmp/pcrsign-private.pem" --public-key="/tmp/pcrsign-public.pem" --phase=: | tee "/tmp/pcrsign.sig"
/usr/lib/systemd/systemd-measure sign --current "${MEASURE_BANKS[@]}" --private-key="/tmp/pcrsign-private.pem" --public-key="/tmp/pcrsign-public.pem" --phase=: | tee "/tmp/pcrsign.sig"
dd if=/dev/urandom of=/tmp/pcrtestdata bs=1024 count=64
systemd-creds encrypt /tmp/pcrtestdata /tmp/pcrtestdata.encrypted --with-key=host+tpm2-with-public-key --tpm2-public-key="/tmp/pcrsign-public.pem"
systemd-creds decrypt /tmp/pcrtestdata.encrypted - --tpm2-signature="/tmp/pcrsign.sig" | cmp - /tmp/pcrtestdata
@ -113,7 +122,7 @@ if [ -e /usr/lib/systemd/systemd-measure ] && \
systemd-creds decrypt /tmp/pcrtestdata.encrypted - --tpm2-signature="/tmp/pcrsign.sig" > /dev/null && { echo 'unexpected success'; exit 1; }
# Sign new PCR state, decrypting should work now.
/usr/lib/systemd/systemd-measure sign --current --bank=sha1 --bank=sha256 --private-key="/tmp/pcrsign-private.pem" --public-key="/tmp/pcrsign-public.pem" --phase=: > "/tmp/pcrsign.sig2"
/usr/lib/systemd/systemd-measure sign --current "${MEASURE_BANKS[@]}" --private-key="/tmp/pcrsign-private.pem" --public-key="/tmp/pcrsign-public.pem" --phase=: > "/tmp/pcrsign.sig2"
systemd-creds decrypt /tmp/pcrtestdata.encrypted - --tpm2-signature="/tmp/pcrsign.sig2" | cmp - /tmp/pcrtestdata
# Now, do the same, but with a cryptsetup binding
@ -135,7 +144,7 @@ if [ -e /usr/lib/systemd/systemd-measure ] && \
SYSTEMD_CRYPTSETUP_USE_TOKEN_MODULE=1 /usr/lib/systemd/systemd-cryptsetup attach test-volume2 $img - tpm2-device=auto,tpm2-signature="/tmp/pcrsign.sig2",headless=1 && { echo 'unexpected success'; exit 1; }
# But once we sign the current PCRs, we should be able to unlock again
/usr/lib/systemd/systemd-measure sign --current --bank=sha1 --bank=sha256 --private-key="/tmp/pcrsign-private.pem" --public-key="/tmp/pcrsign-public.pem" --phase=: > "/tmp/pcrsign.sig3"
/usr/lib/systemd/systemd-measure sign --current "${MEASURE_BANKS[@]}" --private-key="/tmp/pcrsign-private.pem" --public-key="/tmp/pcrsign-public.pem" --phase=: > "/tmp/pcrsign.sig3"
SYSTEMD_CRYPTSETUP_USE_TOKEN_MODULE=0 /usr/lib/systemd/systemd-cryptsetup attach test-volume2 $img - tpm2-device=auto,tpm2-signature="/tmp/pcrsign.sig3",headless=1
/usr/lib/systemd/systemd-cryptsetup detach test-volume2
SYSTEMD_CRYPTSETUP_USE_TOKEN_MODULE=1 /usr/lib/systemd/systemd-cryptsetup attach test-volume2 $img - tpm2-device=auto,tpm2-signature="/tmp/pcrsign.sig3",headless=1