system: login: add note for RADIUS users

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+.. _systemusers:
+
+Login
+-----
+
+The default VyOS user account (`vyos`), as well as newly created user accounts,
+have all capabilities to configure the system. All accounts have sudo capabilities
+and therefore can operate as root on the system. Setting the level to admin is
+optional, all accounts on the system will have admin privileges.
+
+Both local administered and remote administered RADIUS (Remote Authentication
+Dial-In User Service) accounts are supported.
+
+Local
+^^^^^
+
+Create user account `jsmith` and the password `mypassword`.
+
+.. code-block:: sh
+
+  set system login user jsmith full-name "Johan Smith"
+  set system login user jsmith authentication plaintext-password mypassword
+
+The command:
+
+.. code-block:: sh
+
+  show system login
+
+will show the contents of :code:`system login` configuration node:
+
+.. code-block:: sh
+
+  user jsmith {
+      authentication {
+          encrypted-password $6$0OQHjuQ8M$AYXVn7jufdfqPrSk4/XXsDBw99JBtNsETkQKDgVLptXogHA2bU9BWlvViOFPBoFxIi.iqjqrvsQdQ./cfiiPT.
+          plaintext-password ""
+      }
+      full-name "Johan Smith"
+      level admin
+  }
+
+SSH with Public Keys
+********************
+
+The following command will load the public key `dev.pub` for user `jsmith`
+
+.. code-block:: sh
+
+  loadkey jsmith dev.pub
+
+.. note:: This requires uploading the `dev.pub` public key to the VyOS router
+   first. As an alternative you can also load the SSH public key directly
+   from a remote system:
+
+.. code-block:: sh
+
+  loadkey jsmith scp://devuser@dev001.vyos.net/home/devuser/.ssh/dev.pub
+
+In addition SSH public keys can be fully added using the CLI. Each key can be
+given a unique identifier, `calypso` is used oin the example below to id an SSH
+key.
+
+.. code-block:: sh
+
+  set system login user jsmith authentication public-keys callisto key 'AAAAB3Hso...Q=='
+  set system login user jsmith authentication public-keys callisto type 'ssh-rsa'
+
+RADIUS
+^^^^^^
+
+VyOS supports using one or more RADIUS servers as backend for user authentication.
+
+The following command sets up two servers for RADIUS authentication, one with a
+discrete timeout of `5` seconds and a discrete port of `1812` and the other using
+a default timeout and port.
+
+.. code-block:: sh
+
+  set system login radius-server 192.168.1.2 secret 's3cr3t0815'
+  set system login radius-server 192.168.1.2 timeout '5'
+  set system login radius-server 192.168.1.2 port '1812'
+  set system login radius-server 192.168.1.3 secret 's3cr3t0816'
+
+This configuration results in:
+
+.. code-block:: sh
+
+  show system login
+   radius-server 192.168.1.2 {
+       secret s3cr3t0815
+       timeout 5
+       port 1812
+   }
+   radius-server 192.168.1.3 {
+       secret s3cr3t0816
+   }
+
+.. note:: If you wan't to have admin users to authenticate via RADIUS it is
+   essential to sent the ``Cisco-AV-Pair shell:priv-lvl=15`` attribute. Without
+   the attribute you will only get regular, non privilegued, system users.
+
+Source Address
+**************
+
+RADIUS servers could be hardened by only allowing certain IP addresses to connect.
+As of this the source address of each RADIUS query can be configured. If this is
+not set incoming connections to the RADIUS server will use the nearest interface
+address pointing towards the RADIUS server - making it error prone on e.g. OSPF
+networks when a link fails.
+
+.. code-block:: sh
+
+  set system login radius-source-address 192.168.1.254
+
+Login Banner
+^^^^^^^^^^^^
+
+You are able to set post-login or pre-login messages with the following lines:
+
+.. code-block:: sh
+
+  set system login banner pre-login "UNAUTHORIZED USE OF THIS SYSTEM IS PROHIBITED\n"
+  set system login banner post-login "Welcome to VyOS"
+
+the **\\n** create a newline.
+
+
+