Hi,

I'm trying to figure out which versions of OpenSSH automatically
reload server keys (/etc/ssh/ssh_host_{dsa,rsa,}_key) when you change
them without restarting the sshd daemon.

I already know that 4.5p1 on GNU/Linux does automatically reload them,
whereas 3.7.1p2 on HP-UX does not.

I was searching through the source code of 4.5p1 trying to figure out,
where the reload happens, so that I could grep through all the other
sources, but I can't figure out, where exactly does it happen.

To me it seems, like the server keys are loaded just once in the
main() function of sshd.c to the structure sensitive_data and are
stored there ever since. Therefore I don't understand the 4.5p1
behavior.

Thanks very much for any

Ondra Novak

>>>>> "ondrew" == ondrew <ondrew@gmail.com> writes:

ondrew> Hi, I'm trying to figure out which versions of OpenSSH
ondrew> automatically reload server keys
ondrew> (/etc/ssh/ssh_host_{dsa,rsa,}_key) when you change them
ondrew> without restarting the sshd daemon.

ondrew> I already know that 4.5p1 on GNU/Linux does automatically
ondrew> reload them, whereas 3.7.1p2 on HP-UX does not.

ondrew> I was searching through the source code of 4.5p1 trying to
ondrew> figure out, where the reload happens, so that I could grep
ondrew> through all the other sources, but I can't figure out, where
ondrew> exactly does it happen.

ondrew> To me it seems, like the server keys are loaded just once in
ondrew> the main() function of sshd.c to the structure sensitive_data
ondrew> and are stored there ever since. Therefore I don't understand
ondrew> the 4.5p1 behavior.

ondrew> Thanks very much for any

ondrew> Ondra Novak

More recent versions of OpenSSH re-exec themselves for each connection.

--
Richard Silverman
res@qoxp.net