Solutions › IsaScript

IsaScript for TMG and ISA Server

The ultimate in flexibility and rapid development for the ISA/TMG platform.

• Meet custom business requirements
• Augment built-in HTTP filtering
• Code your own using Lua scriptin
• Or use our expert development

Microsoft provides a powerful API to interact with web content passing through the ISA/TMG proxy, allowing dramatic expansion and control over its feature set. But there are many limitations:

• In the ISA/TMG interface, there is no facility to add or modify HTTP headers, just to block them.
• In the ISA/TMG interface, there is no facility to modify request or response bodies, just a limited ability to block by simple signatures.
• Filters must be coded as C/C++ DLLs.
• A high level of expertise is needed to avoid memory leaks or crashing the firewall service!
• It is very work-intensive to build a proof of concept filter.
• Due to the need for expert development, producing even small filters may be prohibitively expensive for many organizations.

Solution

IsaScript from Collective Software is a filter for ISA 2006/2004 and TMG that wraps the web filtering API and exposes it via the popular and easy to learn Lua scripting language. Create filters the fast and easy way.

• Majority of the web filter API is exposed to Lua script.
• Improved content matching abilities not available in the native ISA/TMG API.
• No knowledge of C/C++ needed.
• Lua errors are handled and reported gracefully; no need to worry about memory leaks or firewall crashing.
• Useful for rapid filter prototyping, or even on production systems. Lua scripting incurs only a minimal performance overhead.
• Veteran ISA filter developers will find IsaScript intuitive to use, because it mirrors the C/C++ API in many ways.
• Build your own filters, or take advantage of our expert consultants to help create the perfect solution.
• IsaScript filter development work is far less expensive than building a native C/C++ filter.

We continue to refine and add features to IsaScript to make it a more complete solution. We invite your feedback and feature suggestions.