Bug 2325524

Summary: tpm2: use first PCR algorithm bank supported by TPM as default
Product: [Fedora] Fedora Reporter: Sergio Arroutbi <sarroutb>
Component: clevisAssignee: Sergio Arroutbi <sarroutb>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 41CC: amulhern, extras-qa, fmartine, rsroka, sarroutb, scorreia
Target Milestone: ---   
Target Release: ---   
Hardware: Unspecified   
OS: Linux   
URL: https://github.com/latchset/clevis/pull/490
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Fixed In Version: clevis-21-6.fc41 Doc Type: If docs needed, set a value
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Story Points: ---
Clone Of: 2325522 Environment:
Last Closed: 2024-11-23 05:54:01 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Sergio Arroutbi 2024-11-12 15:39:20 UTC 
+++ This bug was initially created as a clone of Bug #2325522 +++

The default PCR bank for TPM2 is sha1, which is not always supported (it is legacy and optional for implementation). Make this more future-proof and use the first bank with non-empty set of PCRs, which is returned from TPM by tpm2_getcap pcrs.
The swtpm by default does not create sha1 bank, so this fixes usage with swtpm.

Reproducible: Always

Steps to Reproduce:
1.Configure TPM2 bank without sha1
2.Try configuring clevis without specifying bank
3.Check error:
# echo foo | clevis encrypt tpm2 '{"pcr_ids": "7"}' | clevis decrypt
Unable to validate combination of PCR bank 'sha1' and PCR IDs '7'.

Actual Results:  

# echo foo | clevis encrypt tpm2 '{"pcr_ids": "7"}' | clevis decrypt
Unable to validate combination of PCR bank 'sha1' and PCR IDs '7'.



Expected Results:  
Encryption/Decryption should be performed correctly independently of the bank:
# echo foo | clevis encrypt tpm2 '{"pcr_ids": "7"}' | clevis decrypt
foo
Comment 1 Fedora Update System 2024-11-18 11:47:21 UTC 
FEDORA-2024-82d4e1704f (clevis-21-6.fc41) has been submitted as an update to Fedora 41.
https://bodhi.fedoraproject.org/updates/FEDORA-2024-82d4e1704f
Comment 2 Fedora Update System 2024-11-20 02:06:03 UTC 
FEDORA-2024-82d4e1704f has been pushed to the Fedora 41 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2024-82d4e1704f`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2024-82d4e1704f

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
Comment 3 Fedora Update System 2024-11-23 05:54:01 UTC 
FEDORA-2024-82d4e1704f (clevis-21-6.fc41) has been pushed to the Fedora 41 stable repository.
If problem still persists, please make note of it in this bug report.