tpm2-tss question
by Yasuhiro Hosoda
MY name is Yasuhiro Hosoda.
I am developing a program using TSS1.0(Nov１．2016).
I encountered a problem with PolicySecret error 0x98e and need help.
My program uses tpmtest.cpp as a base of development.
The situation is as follows:
1 Create TPM Keys like this.
EK
｜--------
｜ |
MK AK
｜
SK
2 Execute PolicySecret twice using HMAC session. At first, it ends
without error. Then it ends with 0x98e
For clarification, I print out the values of Virtual Handle and Real Handle.
The value of Virtual/Real Handles differ at 2nd excution of the command.
(See NO 25/26 Below)
I understand that the resource manager assigns Virtual Handle and my
program calculates HMAC using that handles.
On the other hand, TPM may calculate HMAC using Real Handle.
That is my hypothesis.
Any suggestion about the usage of Session Handle?
NO Command Virtual/Real Handle LOC
1. CreatePrimary(EK) real=80000000, virtual=80000000 8381
2. HierarchyChangeAuth1 8421
3. HierarchyChangeAuth2 8431
4. StartAuthSession(Policy) real=3000000, virtual=3000000 8480
5. PolicySecret(ENDORSEMENT) 8494
6. Create(MK) 8515
7. PolicySecret(ENDORSEMENT) 8529
8. Load(MK) real=80000001, virtual=80000001 8542
9. Evict(MK) 8552
10. Create(SK) 8590
11. Load(SK) real=80000001, virtual=80000002 8598
12. PolicySecret(ENDORSEMENT) 8609
13. Create(AK) 8635
14. PolicySecret(ENDORSEMENT) 8645
15. Load(AK) real=80000001, virtual=80000003 8655
16. FlushContext(POLICY) 8664
17. StartAuthSession(POLICY) real=3000000, virtual=3000000 8668
18. StartAuthSession(HMAC) real=2000001, virtual=2000001 8678
19. ComputeCommandHMAC(LoadExternal) real=80000000, virtual=80000004 3706
20. ComputeCommandHMAC(HMAC_Start) real=80000001, virtual=80000005 3706
21. PolicySecret(SK) 8711
22. FlushContext(HMAC) 8717
23. FlushContext(POLICY) 8724
24. CertifyCreation(SK) 8738
25. StartAuthSession(POLICY) real=3000000, virtual=3000001 8745
26. StartAuthSession(HMAC) real=2000001, virtual=2000000 8754
27. ComputeCommandHMAC(LoadExternal) real=80000000, virtual=80000005 8782
28. ComputeCommandHMAC(HMAC_Start) real=80000001, virtual=80000004 8782
29. PolicySecret(SK) 8789
The whole source program can be found here.
https://github.com/intel/tpm2-tss/files/1516612/tpmtest.cpp_0x98e_2.txt
Kind regards,
--
Yasuhiro Hosoda
NTT Electronics Corporation （NEL)
Security Support Project
2 years, 5 months
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I've just tagged and signed an rc0 for tpm2-tools 3.1.3. The folks at
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the semantic versioning policy. This release addresses those changes
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by Litjes, Christian
Hi everyone,
I'm trying to setup a system with the cryptfs2 and tpm2-tooling which is currently working but I'd like to change the DictionaryAttackParamater recovery time.
I've tried the following (scenario 1)
Reset TPM from the bios
Tmp2_takeownership -T "device" -L "1234567890"
Tpm2_dictionarylockout -s -n 32 -l 86400 -t 5 -p "1234567890"
I get a warning: the command may require writing of NV and NV is not current accessible.
If I check the settings with:
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I notice they are not changed
Reset TPM from the bios
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Tpm2_getcap -c properties-variable
Values are written
Tmp2_takeownership -T "device" -L "1234567890"
Tpm2_getcap -c properties-variable
Settings are reset to default
What would I need to do to get the first scenario to work? I know I'm combining tools from 2.x with master. But that's because the cryptfs tooling is dependent on 2.x.
How can I unlock the NV, I've found tpm2_release but I've got no clue what to release.
Kind Regards,
Christian Litjes
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