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Description of problem:

In the man pages for ssh_config and sshd_config, for the parameters:

KexAlgorithms 
MACs

are only reported the default values, but not all the supported one, like what has been done in RHEL7.

On RHEL6, openssh lack the -Q feature that allow to list the supported features, so an up to date man page is very important for customer trying to do hardening of their ssh setup.


Version-Release number of selected component (if applicable):

openssh-server-5.3p1-124.el6_10.x86_64
openssh-clients-5.3p1-124.el6_10.x86_64


How reproducible:
Always

Steps to Reproduce:
1. man ssh_config (or) man sshd_config

Actual results:
1. no info about all the supported KEX and MAC


Expected results:
Finding the complete list of the supported KEX and MAC on RHEL6.

As confirmed by the Maintainer, rhel6 openssh support the following:

kexAlgorithms:

diffie-hellman-group1-sha1
diffie-hellman-group14-sha1
diffie-hellman-group-exchange-sha1
diffie-hellman-group-exchange-sha256
ecdh-sha2-nistp256
ecdh-sha2-nistp384
ecdh-sha2-nistp521


MACs:

hmac-sha1
hmac-sha1-96
hmac-sha2-256
hmac-sha2-512
hmac-md5
hmac-md5-96
hmac-ripemd160
hmac-ripemd160
umac-64

Created attachment 1692775 [details]
Man changes proposal

Created attachment 1692874 [details]
man ssh_config.5 changes

Created attachment 1692875 [details]
man sshd_config.5 changes

The proposed changes to man pages look good to me. But it is very unlikely we would be doing the openssh errata for this in RHEL 6 so if there is a chance to get it fixed through manual page override, it would be preferable (though not sure what the process is here).

Andrea,
would a knowledge base article be sufficient for the customer.
We really have no latitude to fix non-critical bugs in RHEL-6.

If a KB is sufficient, please close this bug and state that, if not I will need to ask you to escalate via Program Management.