TRITON - Web Security Help, Version 7.7 - Websense

Refine Filtering PoliciesManaging traffic based on file typeTRITON - Web Security Help | Web Security Solutions | Version 7.7.xRelated topics: Filtering based on file extension, page 283 Filtering based on file analysis, page 286 Working with file type definitions, page 288 Adding custom file types, page 288 Adding file extensions to a file type, page 289When you create or edit a category filter, you can configure file type blocking forpermitted categories. This allows your organization to restrict access to particular filetypes from Web sites in some or all permitted categories. For example, you couldpermit the category Sports, but block multimedia (audio and video) files from sites inthe Sports category.How file type blocking is implemented depends on your Websense Web securitysolution.Websense Web Filter and Websense Web Security (no Content Gateway orhybrid service proxy) allow you to block file types based solely on file extension(see Filtering based on file extension, page 283).For example:1. The General Email category is permitted in the active category filter, but filetype blocking is enabled for Compressed Files in the category.2. An end user attempts to download a file with a file with a .zip extension (like“myfile.zip”).3. The user receives a block page indicating that the download was blocked byfile type, because the “.zip” file extension is associated with the CompressedFiles file type.Websense Web Security Gateway and Gateway Anywhere (which includeContent Gateway and the hybrid service) enable 2-part file type blocking, basedon a combination of file extension (see Filtering based on file extension, page283) and analysis of requested files (see Filtering based on file analysis, page286).For example:1. The General Email category is permitted in the active category filter, but filetype blocking is enabled for Compressed Files in the category.2. An end user attempts to download a file with a file with a .zip extension (like“myfile.zip”).3. The user receives a block page indicating that the download was blocked byfile type, because the “.zip” file extension is associated with the CompressedFiles file type.282 Websense Web Security Solutions