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Message-Id: <20211122191752.1308953-2-stefanb@linux.ibm.com>
Date: Mon, 22 Nov 2021 14:17:51 -0500
From: Stefan Berger <stefanb@...ux.ibm.com>
To: jarkko@...nel.org, linux-integrity@...r.kernel.org
Cc: peterhuewe@....de, linux-kernel@...r.kernel.org,
Stefan Berger <stefanb@...ux.ibm.com>
Subject: [PATCH 1/2] selftests: tpm: Probe for available PCR bank
Probe for an available PCR bank to accommodate devices that do not have a
SHA-1 PCR bank or whose SHA-1 bank is deactivated.
Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
---
tools/testing/selftests/tpm2/tpm2_tests.py | 31 ++++++++++++++++------
1 file changed, 23 insertions(+), 8 deletions(-)
diff --git a/tools/testing/selftests/tpm2/tpm2_tests.py b/tools/testing/selftests/tpm2/tpm2_tests.py
index 9d764306887b..a569c8d0db08 100644
--- a/tools/testing/selftests/tpm2/tpm2_tests.py
+++ b/tools/testing/selftests/tpm2/tpm2_tests.py
@@ -27,7 +27,21 @@ class SmokeTest(unittest.TestCase):
result = self.client.unseal(self.root_key, blob, auth, None)
self.assertEqual(data, result)
+ def determine_bank_alg(self):
+ # Probe for available PCR bank
+ for bank_alg in [tpm2.TPM2_ALG_SHA1, tpm2.TPM2_ALG_SHA256]:
+ try:
+ handle = self.client.start_auth_session(tpm2.TPM2_SE_TRIAL)
+ self.client.policy_pcr(handle, [17], bank_alg=bank_alg)
+ break
+ except tpm2.UnknownPCRBankError:
+ pass
+ finally:
+ self.client.flush_context(handle)
+ return bank_alg
+
def test_seal_with_policy(self):
+ bank_alg = self.determine_bank_alg()
handle = self.client.start_auth_session(tpm2.TPM2_SE_TRIAL)
data = ('X' * 64).encode()
@@ -35,7 +49,7 @@ class SmokeTest(unittest.TestCase):
pcrs = [16]
try:
- self.client.policy_pcr(handle, pcrs)
+ self.client.policy_pcr(handle, pcrs, bank_alg=bank_alg)
self.client.policy_password(handle)
policy_dig = self.client.get_policy_digest(handle)
@@ -47,7 +61,7 @@ class SmokeTest(unittest.TestCase):
handle = self.client.start_auth_session(tpm2.TPM2_SE_POLICY)
try:
- self.client.policy_pcr(handle, pcrs)
+ self.client.policy_pcr(handle, pcrs, bank_alg=bank_alg)
self.client.policy_password(handle)
result = self.client.unseal(self.root_key, blob, auth, handle)
@@ -72,6 +86,7 @@ class SmokeTest(unittest.TestCase):
self.assertEqual(rc, tpm2.TPM2_RC_AUTH_FAIL)
def test_unseal_with_wrong_policy(self):
+ bank_alg = self.determine_bank_alg()
handle = self.client.start_auth_session(tpm2.TPM2_SE_TRIAL)
data = ('X' * 64).encode()
@@ -79,7 +94,7 @@ class SmokeTest(unittest.TestCase):
pcrs = [16]
try:
- self.client.policy_pcr(handle, pcrs)
+ self.client.policy_pcr(handle, pcrs, bank_alg=bank_alg)
self.client.policy_password(handle)
policy_dig = self.client.get_policy_digest(handle)
@@ -91,13 +106,13 @@ class SmokeTest(unittest.TestCase):
# Extend first a PCR that is not part of the policy and try to unseal.
# This should succeed.
- ds = tpm2.get_digest_size(tpm2.TPM2_ALG_SHA1)
- self.client.extend_pcr(1, ('X' * ds).encode())
+ ds = tpm2.get_digest_size(bank_alg)
+ self.client.extend_pcr(1, ('X' * ds).encode(), bank_alg=bank_alg)
handle = self.client.start_auth_session(tpm2.TPM2_SE_POLICY)
try:
- self.client.policy_pcr(handle, pcrs)
+ self.client.policy_pcr(handle, pcrs, bank_alg=bank_alg)
self.client.policy_password(handle)
result = self.client.unseal(self.root_key, blob, auth, handle)
@@ -109,14 +124,14 @@ class SmokeTest(unittest.TestCase):
# Then, extend a PCR that is part of the policy and try to unseal.
# This should fail.
- self.client.extend_pcr(16, ('X' * ds).encode())
+ self.client.extend_pcr(16, ('X' * ds).encode(), bank_alg=bank_alg)
handle = self.client.start_auth_session(tpm2.TPM2_SE_POLICY)
rc = 0
try:
- self.client.policy_pcr(handle, pcrs)
+ self.client.policy_pcr(handle, pcrs, bank_alg=bank_alg)
self.client.policy_password(handle)
result = self.client.unseal(self.root_key, blob, auth, handle)
--
2.31.1
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