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 Browser system

Details
Inventors: Edwards, Nigel; Rees, Owen; Zhong, Qun;
Assignee: Hewlett Packard Company (Palo Alto, CA)
Primary Examiner: Wiley; David
Assistant Examiner:
Attorney, Agent or Firm: Ladas & Parry

A Web browser (210) is configured to run in a middle compartment (206) of a Compartmented Mode Workstation (CMW) (200). The operation of the Web browser (210) is prevented from accessing or damaging other compartments of the CMW machine (200) as a result of mandatory access control (MAC), which is configured appropriately. The Web browser (210) communicates with Web servers (252) attached to the internet (240), the Internet being connected to an outside compartment of the CMW machine (210), via a trusted outside process (TPO) (214). TPO (214) has the privileges required to override MAC. The Web browser (210) communicates with a display server (232), which is attached to an inside compartment (204) of the CMW machine (210), via a trusted inside process (TPI) (204). TPI also has privileges to override MAC. The Web browser (210) can request and receive Web pages incorporating mobile code, and can process the mobile code safely within the middle compartment (206). As a result of processing the mobile code, the Web browser (210) sends only X-messages to the display server (232), in order that the display server can render the images resulting from the processed mobile code.

DETAILED DESCRIPTION What is claimed is: 1.
A browser system, comprising: a browser process configured to receive from a remote data source a resource incorporating mobile code and to process the mobile code securely to generate graphical output data; and a first interface process configured to provide a communications channel between the browser process and a remote display system to facilitate transfer of the graphical output data to the remote display system and protect the remote display system from potentially damaging effects of processing the mobile code.
2.
A browser system according to claim 1, comprising an operating system which associates processes or objects within an operating environment of the operating system with one of a number of sensitivity labels, wherein the browser process has a first sensitivity label and data associated with the remote display system has a second sensitivity label.
3.
A browser system according to claim 1, wherein the first interface process has a first privilege which allows it to transfer data from the browser process to the remote display system.
4.
A browser system according to claim 3, wherein the first interface process is configured to raise the first privilege when data transfer is required and lower the first privilege after data transfer is completed.
5.
A browser system according to claim 2, further comprising a second interface process, which provides a communications channel between the browser process and the remote data source to facilitate transfer of data from the remote data source to the browser process.
6.
A browser system according to claim 5, wherein data associated with the remote data source has a third sensitivity label.
7.
A browser system according to claim 5, wherein the second interface process has a second privilege which allows it to transfer data from the remote data source to the browser process.
8.
A browser system according to claim 7, wherein the second interface process is configured to raise the second privilege when data transfer is required and lower the second privilege after data transfer is completed


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