But the OpenSSH they have in OpenBSD is maintained in-tree I think. And then they have the portable OpenSSH that they maintain separately for other systems to use. And then changes in either are probably integrated into the other keeping them largely the same.
But there surely are some features in either that are intentionally kept out of the other?
> This is a port of OpenBSD's OpenSSH to most Unix-like operating systems, including Linux, OS X and Cygwin. Portable OpenSSH polyfills OpenBSD APIs that are not available elsewhere, adds sshd sandboxing for more operating systems and includes support for OS-native authentication and auditing (e.g. using PAM).
Yes, that is what I am talking about. This has no use for it in the in-tree openssh of BSD, so it wouldn't surprise me if this specific patch is omitted from the in-tree variant.
There is only one OpenSSH, and it is developed by the OpenBSD folks and used by everyone else.