Disable the Debian banner which can be used to identify the Debian version from the publc ip

src/freedombone

@@ -3401,6 +3401,11 @@ function configure_ssh {
   sed -i 's/TCPKeepAlive.*/TCPKeepAlive no/g' /etc/ssh/sshd_config
   sed -i 's|HostKey /etc/ssh/ssh_host_dsa_key|#HostKey /etc/ssh/ssh_host_dsa_key|g' /etc/ssh/sshd_config
   sed -i 's|HostKey /etc/ssh/ssh_host_ecdsa_key|#HostKey /etc/ssh/ssh_host_ecdsa_key|g' /etc/ssh/sshd_config
+  if ! grep -q 'DebianBanner' /etc/ssh/sshd_config; then
+      echo 'DebianBanner no' >> /etc/ssh/sshd_config
+  else
+      sed -i 's|DebianBanner.*|DebianBanner no|g' /etc/ssh/sshd_config
+  fi
   if grep -q 'ClientAliveInterval' /etc/ssh/sshd_config; then
       sed -i 's/ClientAliveInterval.*/ClientAliveInterval 60/g' /etc/ssh/sshd_config
   else