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Status Planned for future release
Workspace SevOne
Categories Configuration and Administration
Created by Guest
Created on Jan 8, 2024

RELATED IDEAS

sshd and security ciphers that are no longer recommended by the industry

Within SSHD.conf there are older unsupported security ciphers that the industry has recommended to be mitigated.  (This was found during a network security scan)

Below is an export from SSHD.conf in its original file. 

              # Limit the Ciphers and MACs to those approved in NMS-43491 for default mode
              Ciphers aes128-cbc,aes256-cbc,aes128-ctr,aes192-ctr,aes256-ctr
              MACs hmac-sha1,hmac-sha1-96,hmac-sha2-256,hmac-sha2-512,hmac-md5,hmac-md5-96

Here is the config that I enabled that disabled / broke cluster communications:

             # Limit the Ciphers and MACs to those approved in NMS-43491 for default mode
             Ciphers aes128-ctr,aes192-ctr,aes256-ctr
             MACs mac-sha2-256,hmac-sha2-512,

Why does the SevOne backend still use hmac-md5,hmac-md5-96 ciphers?  (if you disable hmac-md5,hmac-md5-96 ciphers the cluster goes into a state where HSA's cannot communicate, VIP's fail, chronyd fails and a bunch of other issues arise.) You can safely remove hmac-sha1,hmac-sha1-96, but MD5 is absolutely needed for back end communication...

Can these older MD5 security cipher's needed for back end SevOne communicate please be addresses in a future version of SevOne by hopefully using SHA2? MAC's?

 

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