tests: Add test case to check that swtpm sends a TPM2_Shutdown
Add a test case that checks that swtpm sends a TPM2_Shutdown() to the
TPM 2 upon abrupt re-initialization (CMD_INIT) or graceful shutdown
(control channel, CMD_SHUTDOWN) of the TPM 2 and avoids a potential
dictionary attack (DA) lock-out. A previously sent command failing
authorization with DA implications would otherwise trigger the
TPM_PT_LOCKOUT_COUNTER to increase by '1' if the TPM 2 was not properly
shut down by the client (guest OS) with a TPM2_Shutdown() command.
The test case tests whether a TPM2_Shutdown() is now sent before a reset.
The defined password-protected NVRAM area has the DA flag set and the test
case tries to read from it without providing a password. If we didn't send
the TPM2_Shutdown() before the test cases sends the reset (CMD_INIT), then
the dictionary attack lockout counter would be increased by one. With the
instrumentation in the previous patch the automatically sent
TPM2_Shutdown() keeps the counter at 0.
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
3 files changed
