Bool security model
The Bool security model lets you perform logical operations.
A PSL file containing a description of the Bool security model is located in the KasperskyOS SDK at the following path:
toolchain/include/nk/basic.psl
Bool security model object
The basic.psl file contains a declaration that creates a Bool security model object named bool. Consequently, inclusion of the basic.psl file into the solution security policy description will create a Bool security model object by default.
A Bool security model object does not have any parameters and cannot be covered by a security audit.
It is not necessary to create additional Bool security model objects.
Bool security model methods
The Bool security model contains expressions that perform logical operations and return values of the Boolean type. To call these expressions, use the following logical operators:
!<Boolean> – "logical NOT".- <
Boolean>&&<Boolean> – "logical AND". - <
Boolean>||<Boolean> – "logical OR". - <
Boolean>==><Boolean> – "implication" (!<Boolean>||<Boolean>).
The Bool security model also contains the all, any and cond expressions.
The expression all performs a "logical AND" for an arbitrary number of values of Boolean type. It returns values of the Boolean type. It returns true if an empty list of values ([]) is passed via the parameter. To call the expression, use the following construct:
bool.all <List<Boolean>>
The expression any performs a "logical OR" for an arbitrary number of values of Boolean type. It returns values of the Boolean type. It returns false if an empty list of values ([]) is passed via the parameter. To call the expression, use the following construct:
bool.any <List<Boolean>>
cond expression performs a ternary conditional operation. Returns values of the ScalarLiteral type. To call the expression, use the following construct:
bool.cond
{ if : <Boolean> // Condition
, then : <ScalarLiteral> // Value returned when the condition is true
, else : <ScalarLiteral> // Value returned when the condition is false
}
In addition to expressions, the Bool security model includes the assert rule that works the same as the rule of the same name included in the Base security model.
