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kdc, dsdb: correctly look up server for SPNs containing spaces

Several Hyper-V features use Kerberos services with spaces in their servicePrincipalName, e.g. Microsoft Virtual System Migration Service/UK-VIRT1 for live VM migration. But when Samba is processing a TGS-REQ it instead searches for Microsoft\ Virtual\ System\ Migration\ Service/UK-VIRT1 and receives no results.


  • Commits have Signed-off-by: with name/author being identical to the commit author
  • (optional) This MR is just one part towards a larger feature.
  • (optional, if backport required) Bugzilla bug filed and BUG: tag added
  • Test suite updated with functionality tests
  • Test suite updated with negative tests
  • Documentation updated
  • CI timeout is 3h or higher (see Settings/CICD/General pipelines/ Timeout)

Reviewer's checklist:

  • There is a test suite reasonably covering new functionality or modifications
  • Function naming, parameters, return values, types, etc., are consistent and according to
  • This feature/change has adequate documentation added
  • No obvious mistakes in the code

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