Samsung X4220 Instruction Manual page 42

Samsung Multifunction MultiXpress X4220, X4250, X4300, X401, K4250, K4300, K4350, K401 Series
data first) between different external interfaces is therefore a function that—if allowed at all—can
only be allowed by an authorized role.
It has been viewed as useful to have this functionality as a single component that allows specifying
the property to disallow direct forwarding and require that only an authorized role can allow this.
Since this is a function that is quite common for a number of products, it has been viewed as useful to
define an extended component.
The Common Criteria defines attribute-based control of user data flow in its FDP class. However, in
this Protection Profile, the authors needed to express the control of both user data and TSF data flow
using administrative control instead of attribute-based control. It was found that using FDP_IFF and
FDP_IFC for this purpose resulted in SFRs that were either too implementation-specific for a
Protection Profile or too unwieldy for refinement in a Security Target. Therefore, the authors decided
to define an extended component to address this functionality.
This extended component protects both user data and TSF data, and it could therefore be placed in
either the FDP or the FPT class. Since its purpose is to protect the TOE from misuse, the authors
believed that it was most appropriate to place it in the FPT class. It did not fit well in any of the
existing families in either class, and this led the authors to define a new family with just one member.
FPT_FDI_EXP.1 Restricted forwarding of data to external interfaces
Hierarchical to: No other components
Dependencies: FMT_SMF.1 Specification of Management Functions
FMT_SMR.1 Security roles
FPT_FDI_EXP.1.1 The TSF shall provide the capability to restrict data received on [assignment: list
of external interfaces] from being forwarded without further processing by the TSF to [assignment:
list of external interfaces].
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