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bypass firewall the runtime. Code Access Security Essentially, code access security assigns permissions to assemblies based on assembly evidence. Code access security uses the location from which executable code is obtained and other information about the identity of code as a primary factor in determining what resources the code should have access to. This information about the identity of an assembly is called evidence. Whenever an assembly is loaded into the runtime for execution, the hosting environment attaches a number of pieces of evidence to the assembly. It is the responsibility of the code access security system in the runtime to map this evidence into a set of permissions, which will determine what access this code has to a number of resources such as the registry or the file system. This mapping is based on administrable security policy. Default code access security policy has been designed to be secure and sufficient for most application scenarios of managed code. It strongly limits what code from semi- or untr bypass firewall usted environments, such as the Internet or local intranet is capable of doing when executed on the local machine. The code access security default policy model thus represents an opt-in approach to security. Resources are secure by default; administrators need to take explicit action to make the system less secure. Why we need yet another security paradigm? Code access security revolves around the identity of code, as opposed to user identity. This allows code to run under a single user context in an indefinite number of trust levels. For instance, code coming from the internet can run in restrictive security boundaries, even if the operating system user context in which it runs would allow full access to all system resources. Let us now look at the main input and output of the code access security system: evidence and permissions. Permissions Permissions represent authorization to perform a protected operation. These operations often involve access to a specific resource. In general, the operation can invo. bypass firewall. Very cool if the two-words bypass firewall lve accessing resources such as files, the registry, the network, the user interface, or the execution environment. An example of a permission that does not involve a tangible resource is the ability to skip verification. Note The System.Security.Permissions.SecurityPermission class contains a flag that determines whether recipients of the permission instance are allowed to skip verification. The SecurityPermission class contains other similar permission flags that cover core runtime technology that could open security vulnerability if misused, such as the ability to control the evidence given to assemblies running in a specific application domain. Core runtime technologies are protected by demanding callers to have the requisite SecurityPermission class with the appropriate permission flags set. The fundamental abstraction of a permission is the IPermission interface, and it requires a specific permission type to implement a set of standard permission operations, such as returning the union or subset with other permission instances of the same permission type. Permissions can be collated into a set of permissions, representing a statement of access rights to a variety of resources. The class System.Security.PermissionSet represents the collection of permissions. Methods on this class include Intersect and Union. These methods take another PermissionSet as a parameter and provide a PermissionSet that is either the union or intersection of all the permissions in both sets. (A collection of permissions in the runtime is represented as a simple, non-ordered set.) With these facilities the security system can work with permission sets and not have to understand the semantics of each individual type of permission. This allows developers to extend the permission hierarchy, without needing to modify the functionality of the security engine. Note Each individual permission type must derive from the IPermission interface that requires any permission types to implement standard permission operations such as the union, int.
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When you bypass firewall inside. ersection, and subset and demand methods. Permission types are free to implement the semantics specific to the type of permission state they contain. For instance a permission containing file names will be intersected different from one containing a simple Boolean state. When permission set A is intersected with permission set B, and A and B contain different instances of the same permission type X, then the intersection methods on an instance of X is called by the permission set class A without having to know anything about the semantics of X. Based on the evidence presented to the security system at assembly load time, the security system grants a permission set that represents authority to access various protected resources. Conversely, resources are protected by a permission demand that triggers a security check to see that a specific permission has been granted to all callers of the resource; if the demand fails, an exception is raised. (There is a specific security check, called a link demand, which only checks the immediate caller. Typically though, the whole call stack of callers is checked.)
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