[Bug 1990520] Re: [Ubuntu 22.04] zkey: Fix re-enciphering of EP11 identity key of KMIP plugin

[Launchpad Bug Tracker]

This bug was fixed in the package s390-tools - 2.20.0-0ubuntu3.2

---------------
s390-tools (2.20.0-0ubuntu3.2) jammy; urgency=medium

  * Fix zipl segfaults when "parameters=" is missing (LP: #1974109) with:
    d/p/6ff8202f-zipl-Add-missing-check-for-a-nullpointer.patch
  * Add KVM Secure Execution Attestation Userspace Tool to enhance secure
    execution (hardware feature: FC 115) exploitation (LP: #1959987) with:
    d/p/38639269-libpv-New-library-for-PV-tools.patch
    d/p/3ab06d77-pvattest-Create-perform-and-verify-attestation-measu.patch
    d/p/26148740-pvattest-tools-Add-tool-for-attestation.patch
  * Fix re-enciphering of EP11 identity key of KMIP plugin (LP: #1990520) with:
    d/p/4e2ebe03-libseckey-Fix-re-enciphering-of-EP11-secure-key.patch
  * Fix KMIP plugin fails to connection to KMIP server (LP: #1990524) with:
    d/p/6c5c5f7e-libseckey-Adapt-keymgmt_match-implementation-to-Open.patch
  * d/p/5768d55-zipl-boot-add-secure-boot-trailer.patch
    Add secure boot trailer in zipl stage 3 to keep compatibility with
    upcoming IBM zSystems firmware updates. (LP: #1996069)
  * Add d/p/92b8409-dbginfo.sh-ensure-type-commands-compatible-with-dash.patch
    and d/p/9f93af6-dbginfo.sh-ensure-compatibility-with-bin-dash.patch
    to achieve dbginfo.sh compatibility with /bin/dash shell. (LP: #1996477)

 -- Frank Heimes <frank.heimes at canonical.com>  Wed, 16 Nov 2022 18:14:00
+0200

** Changed in: s390-tools (Ubuntu Jammy)
       Status: Fix Committed => Fix Released

** Changed in: s390-tools-signed (Ubuntu Jammy)
       Status: Fix Committed => Fix Released

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Title:
  [Ubuntu 22.04] zkey: Fix re-enciphering of EP11 identity key of KMIP
  plugin

Status in Ubuntu on IBM z Systems:
  Fix Committed
Status in s390-tools package in Ubuntu:
  Fix Released
Status in s390-tools-signed package in Ubuntu:
  Fix Released
Status in s390-tools source package in Jammy:
  Fix Released
Status in s390-tools-signed source package in Jammy:
  Fix Released

Bug description:
  SRU Justification:
  ------------------

  [ Impact ]

   * When re-enciphering the identity key
     and/or wrapping key of the zkey KMIP plugin via 'zkey kms reencipher',
     the operation completes without an error,
     but the secure keys are left un-reenciphered.

   * A subsequent connection attempt with the KMIP server will fail
     because the identity key is no longer valid.

   * The re-enciphered secure key is not copied back into the key token
  buffer.

   * Also, the the public key part,
     i.e. the MACed SubjectPublicKeyInfo (SPKI) structure
     must also be re-enciphered (i.e. re-MACed),
     since the MAC is calculated with the EP11 master key.

  [ Fix ]

   * 4e2ebe03 4e2ebe0370d9fb036b7554d5ac5df4418dbe0397 "libseckey: Fix
  re-enciphering of EP11 secure key"

  [ Test Plan ]

   * An Ubuntu Server 22.04 for s390x installation with a CryptoExpress
     adapter in EP11 mode and at least one available/online domain is needed.

   * Perform a master key change on the EP11 APQNs used with the KMIP
  plugin.

   * The is done indirectly, via libkmipclient, a shared library that
     provides the KMIP client to communicate with an KMIP server.

   * Test will be done by IBM.

  [ Where problems could occur ]

   * The memcpy, at the beginning and/or at the end or the inserted code
     could be wrong, and copy wrong contents.

   * The newly introduced 're-encipher MACed SPKI' code can be erroneous,
     which may lead to a non working fix.

   * The calculation and handling of the length which could lead to a
  broken cmdblock.

   * Problems could occur in case the re-encryption is done with a different
     master key compared to the initial encryption,
     even though if this should be caught as 'CKR_IBM_WKID_MISMATCH'.

  [ Other Info ]
   
   * The s390-tools version v2.23 in kinetic already incl. this fix,
     hence it's not affected,
     nor versions for Ubuntu releases (in service) older than jammy
     are affected.

  __________

  Description:
  zkey: Fix re-enciphering of EP11 identity key of KMIP plugin

  Symptom:
  When re-enciphering the identity key and/or wrapping key of the zkey KMIP plugin via 'zkey kms reencipher', the operation completes without an error, but the secure keys are left un-reenciphered. A subsequent connection attempt with the KMIP server will fail because the identity key is no longer valid.

  Problem:
  The re-enciphered secure key is not copied back into the key token buffer. Also, the the public key part, i.e. the MACed SubjectPublicKeyInfo (SPKI) structure must also be re-enciphered (i.e. re-MACed), since the MAC is calculated with the EP11 master key.

  Solution:
  Copy the re-enciphered secure key back into the key token buffer, and also re-encipher the public key part.

  Reproduction:  Perform a master key change on the EP11 APQNs used with the
                 KMIP plugin.

  Problem-ID:    197605

  Upstream-ID:   4e2ebe0370d9fb036b7554d5ac5df4418dbe0397

  Preventive:    yes

  Date:          2022-04-08
  Author:        Ingo Franzki <ifranzki at linux.ibm.com>
  Component:     s390-tools

  == Comment: #1 - Ingo Franzki <ifranzki at de.ibm.com> - 2022-04-08 09:57:45 ==
  Upstream commit:
  https://github.com/ibm-s390-linux/s390-tools/commit/4e2ebe0370d9fb036b7554d5ac5df4418dbe0397

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