Nortel Networks 4050 manual Creating logical expressions

Chapter 7 TunnelGuard SRS Builder 333

3Select the Fetch Module Path from Registry Entry check box, if the file name can be fetched from a local registry entry on the desktop PC.

Then enter the desired key path and key value in the fields. Use this option if a module name varies in different setups and available in a registry key.

4Specify the desired limitations regarding version and file age.

See the previous section for more detailed information about these options.

5Select the Enable Hash Checking check box to enable hash value checking of the current SRS entry.

Then paste the hash value to be checked in the Hash Value field. The hash value of a selected file/module (if any) is displayed by default.

6Click OK.

The file/module is added as an entry in the selected software definition. By clicking the Save and More button, the entry is saved but the Create New On Disk SRS Entry window remains open so you can add more entries to the current software definition.

The file is added as a software definition entry on the right pane.

Creating logical expressions

To be able to specify an SRS rule that comprises a number of different requirements, you may create a logical expression. The logical expression should contain the conditions that must be true for the TunnelGuard checks to pass. For example, a logical expression can define several applications that must be present on the client computer or that either of two applications must be present.

Having created a logical expression with the desired conditions, select the expression for the TunnelGuard SRS rule.

1Create the desired software definitions.

For example, you may create one software definition identifying an antivirus program, another software definition that identifies a certain executable, a third that identifies a certain dll file an so on. For instructions on how to create a software definition, see “Creating a software definition” on page 327.

Nortel Secure Network Access Switch 4050 User Guide