Portal access allows end users access to internal web applications with a web browser from outside the network. With portal access, the BIG-IP Access Policy Manager communicates with back-end servers, and rewrites links in application web pages so that further requests from the client browser are directed back to the Access Policy Manager server. With portal access, the client computer requires no specialized client software other than a web browser.
Portal access provides clients with secure access to internal web servers, such as Microsoft OutlookWeb Access (OWA), Microsoft SharePoint, and IBM Domino Web Access. Using portal access functionality, you can also provide access to most web-based applications and internal web servers.
Portal access differs from network access, which provides direct access from the client to the internal network. Network access does not manipulate or analyze the content being passed between the client and the internal network. The portal access configuration gives the administrator both refined control over the applications that a user can access through Access Policy Manager, and content inspection for the application data. The other advantage of portal access is security. Even if a workstation might not meet requirements for security for full network access, such a workstation can be passed by the access policy to certain required web applications, without allowing full network access. In a portal access policy, the client computer itself never communicates directly with the end-point application. That means that all communication is inspected at a very high level, and any attacks originating on the client computer fail because the attack cannot navigate through the links that have been rewritten by the portal access engine.
A portal access configuration requires several elements:
Portal access elements are summarized in this diagram.
In full patching mode, you can select one or more of the following content types in which portal access rewrites links.
|Patching content type||Description|
|HTML patching||Rewrites links in HTML content to redirect to the Access Policy Manager.|
|CSS patching||Rewrites links to CSS files, and within CSS content, to redirect to the Access Policy Manager.|
|Flash patching||Rewrites links in Flash movies and objects to redirect requests to the Access Policy Manager.|
|Java patching||Rewrites link content in Java code to redirect requests to the Access Policy Manager. Access Policy Manager can also relay and handle any socket connections required by a patched Java applet.|
In minimal patching mode, portal access allows only minimum rewriting of web application content. Minimal patching mode is useful for troubleshooting, or when full portal access patching fails with a file or site.
In minimal patching mode, only HTML and CSS content is patched.
To use minimal patching, the following conditions must be met:
|Scheme patching||Specifies a method of patching that replaces all HTTP scheme addresses with HTTPS scheme addresses.|
|Host Patching||Specifies a method of patching where one or multiple hosts (typically the actual application server host name) are replaced with another host, the Access Policy Manager virtual server. You can specify multiple hosts separated with spaces for host search strings. The host replace string must be the Access Policy Manager virtual server IP address or fully qualified domain name (FQDN).|