Barracuda Networks SSL VPN, Руководство администратора

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50 Barracuda SSL VPN Administrator’s Guide
Applications
Remote users may need to use client/server applications within the secure network so will need to use
an application shortcut to facilitate this (a client/server application is something that uses software
running on the client machine to connect to a server running elsewhere on the network e.g. an RDP
connection to the desktop of their office pc). The Applications resource allows the administrator to
customize which applications are available by publishing a shortcut to each application required. The
benefits of being able to distribute applications via the Barracuda SSL VPN are mainly due to the
reduced software distribution costs, as the need to install specific application software on each client
is removed in most cases.
The Application resource consists of a shortcut and an application extension. When the application
resource is invoked the SSL VPN Agent opens a tunnel to the destination machine and then launches
the application specified by the shortcut (i.e. the application extension). This application uses the
tunnel for secure communication with the destination machine.
An Application shortcut requires (as a minimum):
• Shortcut identity i.e. Name
• Valid extension i.e. Application Type
• Hostname of the remote machine
For example, an Application Shortcut can be created to allow users access to their office pc desktop
from home.
To use Microsoft’s Remote Desktop, an Application Shortcut called e.g. ‘My Computer’ is created
with ‘RDP – Microsoft RDP Client’ as the extension to use (Application Type). When the user selects
the My Computer application shortcut from their home pc, the RDP Client extension will launch a
remote desktop session to their office pc. The desktop of the remote pc will be displayed and the user
will be able to work as though they were sitting in front of the pc in the office.
Alternatively an Application shortcut called ‘My Computer’ can be created with the ‘UltraVNC’
extension. This will give the user the same access to their office pc but by using a different
application.
The extension is the method of connection used to gain access to the application and so must be
installed on the appliance before a shortcut can be created. A number of extensions are preinstalled
on the SSL VPN: a dropdown list of all available extensions (Application Type) can be found on the
Manage Account > Resources > Applications page in the Create Application Shortcut section.
Each application type has potentially different requirements for operating information and this
information can be specified by selecting the Edit action next to the Application on the Manage
Account > Resources > Applications page.