How to disable the non etm mac algorithms for SSH, when using system-wide cryptographic policies ?

Solution Verified - Updated -

Issue

  • In the system-wide cryptographic policy, disable below Non-ETM MAC algorithms for SSH.

    hmac-sha2-256
umac-128@openssh.com
hmac-sha2-512

  • Enable only the etm ( Encrypt then mac) MAC algorithms.

    hmac-sha2-256-etm@openssh.com
umac-128-ethm@openssh.com
hmac-sha2-512-etm@openssh.com

Environment

  • Red Hat Enterprise Linux 8, 9 and 10
  • openssh
  • crypto-policies

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