On Mon, May 15, 2017 at 11:39 AM, Peter Moody <mindrot@xxxxxxxx> wrote: > my reading of the sshd manpage is that ssh is more permissive than it should be > > SSH_KNOWN_HOSTS FILE FORMAT : > ... > > A hostname or address may optionally be enclosed within `[' and `]' > brackets then followed by `:' and a non-standard port number. Hi Peter, I'm not sure that quite answers the same question. ie at one level there is a decision that is made about whether a line in the known hosts file should be evaluated for a given host/port - and I think that's what you are referring to above. However once a line from known hosts is allowed for evaluation for a host/port, there's a second matter of checking whether the certificate presented contains the appropriate principal. I think this what "check_host_cert()" does, and as far as I can tell, OpenSSH only passes it the hostname (not "host:port"). See: https://github.com/openssh/openssh-portable/blob/f382362e8dfb6b277f16779ab1936399d7f2af78/sshconnect.c#L866 (for better or for worse, this would be roughly inline with X.509v3 cert host matching, which also doesn't match on port numbers) _______________________________________________ openssh-unix-dev mailing list openssh-unix-dev@xxxxxxxxxxx https://lists.mindrot.org/mailman/listinfo/openssh-unix-dev
