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Types of Method Permission Requests
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Although there are only three types of CAS assembly declarations (RequestOptional, RequestMinimum, and RequestRefuse), you have six options available for imperative and declarative permissions within a method. The following list describes each option:
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Assert Instructs the runtime to ignore the fact that callers might not have the
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specified permission. Assemblies must have the Assert Any Permission That Has Been Granted security permission setting.
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Demand Instructs the runtime to throw an exception if the caller and all callers
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higher in the stack lack the specified permission.
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Deny Causes the runtime to reduce the method s access by removing the spec-
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Lesson 3: Using Declarative and Imperative Security to Protect Methods
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InheritanceDemand Instructs the runtime to throw an exception if the assembly
inheriting from the class lacks the specified permission.
LinkDemand Causes the runtime to throw an exception if the immediate caller, but not callers higher in the stack, lack the specified permission. PermitOnly Instructs the runtime to reduce the method s access by removing all permissions except for the specified permission.
To understand each of these methods, consider a group of four guests who want to enter an exclusive party. The host (your method) has hired a bouncer (the .NET Framework runtime) to make sure that only guests (calling assemblies) with an invitation (a CAS permission) are allowed to enter the party (call your method). If the host calls InvitedGuests.LinkDemand, the bouncer will check the invitation of the first guest and then allow everyone else into the party. This is quick, but it might let people sneak into the party. If the host calls InvitedGuests.Demand, the bouncer will check the invitation of every guest individually. This process takes more time, but it ensures that nobody can sneak in. To speed up the process of checking invitations, the first invited guests might use InvitedGuests.Assert to assure the bouncer that all the guests in the group were invited assuming that the bouncer trusted the first guest enough. This procedure would also allow the first guest to bring guests who lacked invitations, which might be a good thing if the host wanted to have a lot of people at the party but didn t want to hand out too many invitations (that might fall into the wrong hands). However, it might be a bad thing if a thief discovered that he could sneak into the party. If the host wanted to ensure that people danced at the party (and never did anything else), the host would use Dancing.PermitOnly to instruct the bouncer to make sure that guests stayed on the dance floor. If the host wanted people to do anything but dance, the host would use Dancing.Deny to prevent anyone from dancing.
Guidelines for Using Method Permission Requests
As a developer, you have many choices for implementing CAS in your applications. Choosing how to implement CAS for a particular situation can be complicated, however. Follow these guidelines to choose which CAS methods to use:
Use SecurityAction.PermitOnly declarations to limit the permissions available to each method. List every permission the method requires. Use SecurityAction.Deny declarations to further refine the permissions available to each method.
11
Application Security
Use CodeAccessPermission.PermitOnly to imperatively reduce permissions when a section of a method requires fewer permissions than the rest of the method. This is particularly important when calling objects created by third parties. Use CodeAccessPermission.RevertPermitOnly to restore the permission. Use CodeAccessPermission.Assert when you want to allow partially trusted code to call a method that requires permissions the caller might lack. Review your code carefully for potential security vulnerabilities; Assert can be abused by an attacker to gain elevated privileges. After you perform the functions requiring elevated privileges, use CodeAccessPermission.RevertAssert to restore the original permissions. Use CodeAccessPermission.Demand only when your assembly implements customized functionality that does not rely on functionality built into the .NET Framework, such as calls to unmanaged code.
NOTE Security risks of declarative demands
There s a school of thought that says declarative security demands are less secure than imperative security demands because declarative demands can reveal to attackers too much about the code s design and potential vulnerabilities. It s true that declarative security demands are a bit easier for an attacker to analyze, but a sophisticated attacker could also examine imperative demands by using a tool that analyzes your assembly s Intermediate Language (IL) code. It s a bit harder for the attacker to analyze IL than to analyze the declarative security demands, but it wouldn t make much of a difference to an attacker who was sophisticated enough to make use of security demand information. Also, declarative demands are faster than imperative demands.
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