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This article has been
excerpted from book "The Complete Visual C# Programmer's Guide" from the Authors
of C# Corner.
A named permission set is a set of permissions that security administrators
associate with code groups-in other words, a group of permissions given a unique
name. A named permission set consists of one or more permissions and a name and
description for the permission set. Administrators can establish or modify the
security policy for code groups by using named permission sets. Of course, more
than one code group can be associated with the same named permission set.
The .NET Security Framework has built-in named permission sets that the system
administrator cannot modify. The administrator can create custom named
permission sets and modify security policy to use these customized sets in lieu
of the built-in ones. When naming the custom permission sets, you must ensure
that the names do not conflict with those of the built-ins.
The CLR provides the following permission set flags:
- Nothing-gives no permissions or prevents
code from running.
- Execution-gives permission to run or
execute but does not give permission to use protected resources.
- Internet-the default policy permission set
for content from unknown origin.
- LocalIntranet-the default policy
permission set within an enterprise.
- Everything-gives all standard built-in
permissions but does not include permission to skip verification.
- FullTrust-gives full access to all
resources protected by permissions. It can be unrestricted.
You can modify only the Internet, LocalInternet,
and Everything permission sets.
Listing 22.1 contains code extracted from a typical policy configuration file
that sets Internet permissions, the default rights given to Internet
applications.
Listing 22.1: Internet Permission Set
<PermissionSet
class="NamedPermissionSet"
version="1" Name="Internet" Description="Default
rights given to internet applications"> <IPermission
class="FileDialogPermission" version="1" Access="Open"/> <IPermission
class="IsolatedStorageFilePermission" version="1" Allowed="DomainIsolationByUser" UserQuota="10240"/> <IPermission
class="SecurityPermission" version="1" Flags="Execution"/> <IPermission
class="UIPermission" version="1" Window="SafeTopLevelWindows" Clipboard="OwnClipboard"/> <IPermission
class="PrintingPermission" version="1" Level="SafePrinting"/> </PermissionSet>
Listing 22.2 generates output that lists all known policy levels and named
permission sets at all policy levels.
Listing 22.2: Output Named Permission Sets
using System;
using System.Collections; using System.Security; using System.Security.Policy;
class
testsecurity { public static
void Main(string[]
args) { IEnumerator ienum1 =
SecurityManager.PolicyHierarchy();
while (ienum1.MoveNext()) { PolicyLevel pol = (PolicyLevel)ienum1.Current; Console.WriteLine(pol.Label); IEnumerator ienum2 = pol.NamedPermissionSets.GetEnumerator();
while (ienum2.MoveNext()) { NamedPermissionSet permset = (NamedPermissionSet)ienum2.Current; Console.WriteLine(permset.Name + ", " + permset.Description); } } } }
Conclusion
Hope this article would have helped you in understanding a
named permission set in C#. See other articles on the website on .NET and C#.
|
The Complete Visual
C# Programmer's Guide covers most of the major components that make
up C# and the .net environment. The book is geared toward the
intermediate programmer, but contains enough material to satisfy the
advanced developer. |
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