Bug#764842: systemd socket file does not recognise port setting

[Kai Lüke <kailueke@riseup.net>]

Package: openssh-server
Version: 1:6.7p1-2

While openssh should use the port specified in /etc/ssh/sshd_config, the
systemd socket file is hard coded with ListenStream=22. Because changes
in /lib/systemd/system/ssh.socket are overwritten by updates of the
openssh-server package, the postinst script should make sure that the
port of sshd_config is also used in ssh.socket.

As simple workaround I changed the postinst script as follows from line
281 to call a new function set_port_in_ssh_socket:

if [ "$action" = configure ]; then
        create_sshdconfig
        set_port_in_ssh_socket
        create_keys
        fix_statoverride
        setup_sshd_user

Which looks like that:

set_port_in_ssh_socket() {
        listenport=$(grep Port /etc/ssh/sshd_config | cut -d ' ' -f 2)
        systemdsocketfile=$(sed
"s/ListenStream=22/ListenStream=$listenport/"
/lib/systemd/system/ssh.socket)
        echo "$systemdsocketfile" > /lib/systemd/system/ssh.socket
}

The code (also attached) is not beautiful and I'm not sure whether this
is the right place to do it. But at least that way people upgrading from
wheezy to jessie have sshd running on the same port if they changed it
in sshd_config before ;)

Regards,
Kai

265a266,271
> set_port_in_ssh_socket() {
> 	listenport=$(grep Port /etc/ssh/sshd_config | cut -d ' ' -f 2)
> 	systemdsocketfile=$(sed "s/ListenStream=22/ListenStream=$listenport/" /lib/systemd/system/ssh.socket)
> 	echo "$systemdsocketfile" > /lib/systemd/system/ssh.socket
> }
> 
282a289
> 	set_port_in_ssh_socket