A KasperskyOS-based solution security policy description (hereinafter also referred to as a solution security policy description or policy description) provides a set of interrelated text files with the psl extension that contain declarations in the PSL language (Policy Specification Language). Some files reference other files through an inclusion declaration, which results in a hierarchy of files with one top-level file. The top-level file is specific to the solution. Files of lower and intermediate levels contain parts of the solution security policy description that may be specific to the solution or may be re-used in other solutions.
Some of the files of the lower and intermediate levels are provided in the KasperskyOS SDK. These files contain definitions of the basic data types and formal descriptions of KasperskyOS security models. KasperskyOS security models (hereinafter referred to as security models) serve as the framework for implementing security policies for KasperskyOS-based solutions. Files containing formal descriptions of security models reference a file containing definitions of the basic data types that are used in the descriptions of models.
The other files of lower and intermediate levels are created by the policy description developer if any parts of the policy description need to be re-used in other solutions. A policy description developer can also put parts of the policy description into separate files for convenient editing.
The top-level file references files containing definitions of basic data types and descriptions of security models that are applied in the part of the solution security policy that is described in this file. The top-level file also references all files of the lower and intermediate levels that were created by the policy description developer.
The top-level file is normally named security.psl, but it can have any other name in the *.psl format.