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POAssert Permissions in C#
 

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    <p>I'm busy trying to understand the security stuff in c# and I'm struggling to see how Assert works. I'm using .net 3.5.</p> <p>I made a sample app to try figure this out.</p> <p>Calling method:</p> <pre><code>[FileIOPermission(SecurityAction.Deny, ViewAndModify = @"C:\")] static void Main(string[] args) { WriteTest testWriter = new WriteTest(); testWriter.Test(); Console.Read(); } </code></pre> <p>In a seperate class library I have:</p> <pre><code>public class WriteTest { public void Test() { try { FileIOPermission permission = new FileIOPermission(FileIOPermissionAccess.Write, @"C:\"); permission.Assert(); using (StreamWriter sw = new StreamWriter(@"C:\test.txt")) { sw.WriteLine("testing!"); sw.Flush(); } Console.WriteLine("Writen to file!"); } catch (SecurityException sec) { Console.WriteLine("No privileges!"); } } } </code></pre> <p>This code executes fine and all. It will write to the file. My question is how exactly does this work? Does this not invalidate the security classes if I can just Assert the permissions I want so that it skips the checks? If I change Assert to Demand it throws an exception. </p> <p>Is the point of the security classes not to allow me to set permissions so that when I call a third party class I can prevent it from going rogue and doing stuff I don't want it to do? I know if I load the dll in an AppDomain I will get this effect even if the third party DLL does use Assert, it just seems strange that if I call it directly it will work. I've tried reading the MSDN documentation on Assert but I'm finding it hard to understand.</p>
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    1. USDavid Esteves
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    1. COMake sure you need to understand the pre .NET 4 security model... since .NET 4.0 Code Access Security has been simplified.
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      1. USSimon Smeets
 

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