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List:       openssh-unix-dev
Subject:    OpenSSH 8.0 - 8.2 ClientAlive issue
From:       "Mervyn McMurray (mmcmurra)" <mmcmurra () cisco ! com>
Date:       2020-06-09 23:45:51
Message-ID: C5C8842B-4D46-4AAB-B9C4-33509A8E0A98 () cisco ! com
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Hi,

I have recently upgraded from OpenSSH 7.5 to OpenSSH 8.0 (I know its old, but I have \
complications in a cross compiled environment).

After the upgrade I have noticed the Client Alive mechanism has stopped working. I \
operate in a environment where it is common for the TCP link between client and \
server to get dropped after a period of inactivity, due to firewall configuration.

The issue seems to be the patch created for \
https://bugzilla.mindrot.org/show_bug.cgi?id=2757

I have undone the patch in my OpenSSH 8.0 and ClientAlive functionality is restored \
to a working state.

I have tested the scenario in #2757 and it seems to work as expected on my patched \
OpenSSH 8.0. I get rekey events approximately every 45 seconds and no client alive \
messages. SSH session remains forever. This is the expected result from the original \
submitter

I suggest the original bug was possibly a confusion with "ClientAliveCountMax=0" \
which has been fixed recently.

I have included my revert patch. Is there anything else I need to do in order to get \
this fixed for OpenSSH 8.3?

regards,

  Mervyn





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