Csharp/CSharp Tutorial/File Directory Stream/File Permission
Содержание
Declarative Permission demo
<source lang="csharp">using System; using System.IO; using System.Security; using System.Security.Permissions; using System.Collections.Generic; using System.Text;
class Program
{
[FileIOPermission(SecurityAction.Demand, AllLocalFiles=FileIOPermissionAccess.Write)]
static void Main(string[] args)
{
FileStream fs = new FileStream("myfile.txt", FileMode.Create);
fs.WriteByte(65);
fs.Close();
}
}</source>
Demanding permissions
<source lang="csharp">using System; using System.IO; using System.Security.Permissions; [FileIOPermissionAttribute(SecurityAction.Demand,All=@"c:\\temp")] class MainClass {
public static void Main()
{
FileStream fsOut = File.Create(@"c:\\temp\\test.txt");
StreamWriter sw = new StreamWriter(fsOut);
sw.WriteLine("str");
sw.Flush();
sw.Close();
}
}</source>
Permission sets
<source lang="csharp">using System; using System.Collections.Generic; using System.IO; using System.IO.IsolatedStorage; using System.Net; using System.Net.Sockets; using System.Reflection; using System.Security; using System.Security.AccessControl; using System.Security.Policy; using System.Security.Permissions; using System.Security.Principal; using System.Text; public class MainClass {
public static void Main()
{
NamedPermissionSet ps = new NamedPermissionSet("SamplePermissionSet", PermissionState.None);
ps.AddPermission(new FileIOPermission(FileIOPermissionAccess.AllAccess, @"C:\test\"));
ps.AddPermission(new ReflectionPermission(PermissionState.Unrestricted));
ps.AddPermission(new SecurityPermission(SecurityPermissionFlag.Execution));
Console.WriteLine(ps.ToXml().ToString());
}
}</source>
<PermissionSet class="System.Security.NamedPermissionSet" version="1" Name="SamplePermissionSet"> <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.0.0, Culture =neutral, PublicKeyToken=b77a5c561934e089" version="1" Read="C:\test\" Write="C:\test\" Append="C:\test\" PathDiscovery="C:\test\"/> <IPermission class="System.Security.Permissions.ReflectionPermission, mscorlib, Version=2.0.0.0, Cul ture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true"/> <IPermission class="System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.0.0, Cultu re=neutral, PublicKeyToken=b77a5c561934e089" version="1" Flags="Execution"/> </PermissionSet>
Refusing permissions
<source lang="csharp">using System; using System.IO; using System.Security.Permissions; [assembly:FileIOPermissionAttribute(SecurityAction.RequestRefuse,Unrestricted=true)] class MainClass {
public static void Main()
{
FileStream fsOut = File.Create(@"c:\\temp\\test.txt");
StreamWriter sw = new StreamWriter(fsOut);
sw.WriteLine("str");
sw.Flush();
sw.Close();
}
}</source>
Unhandled Exception: System.Security.SecurityException: Request for the permission of type "System.S ecurity.Permissions.FileIOPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77 a5c561934e089" failed. at System.Security.CodeAccessSecurityEngine.Check(Object demand, StackCrawlMark& stackMark, Boole an isPermSet) at System.Security.CodeAccessPermission.Demand() at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, St ring msgPath, Boolean bFromProxy) at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int 32 bufferSize, FileOptions options) at MainClass.Main() The action that failed was: Demand The type of the first permission that failed was: System.Security.Permissions.FileIOPermission The first permission that failed was: <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.0.0, Culture =neutral, PublicKeyToken=b77a5c561934e089" version="1" Read="c:\temp\test.txt" Write="c:\temp\test.txt"/> The demand was for: <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.0.0, Culture =neutral, PublicKeyToken=b77a5c561934e089" version="1" Read="c:\temp\test.txt" Write="c:\temp\test.txt"/> The granted set of the failing assembly was: <PermissionSet class="System.Security.PermissionSet" version="1" Unrestricted="true"/> The refused set of the failing assembly was: <PermissionSet class="System.Security.PermissionSet" version="1"> <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.0.0, Culture =neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true"/> </PermissionSet> The assembly or AppDomain that failed was: main, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null The method that caused the failure was: Void Main() The Zone of the assembly that failed was: MyComputer The Url of the assembly that failed was: file:///C:/Java_Dev/WEB/dev/CSharp/main.exe
Requesting a permission set
<source lang="csharp">using System; using System.IO; using System.Security.Permissions; [assembly:PermissionSetAttribute(SecurityAction.RequestMinimum,Name="FullTrust")] class MainClass {
public static void Main()
{
FileStream fsOut = File.Create(@"c:\\temp\\test.txt");
StreamWriter sw = new StreamWriter(fsOut);
sw.WriteLine("str");
sw.Flush();
sw.Close();
}
}</source>
Requesting minimum permissions
<source lang="csharp">using System; using System.IO; using System.Security.Permissions; [assembly:FileIOPermissionAttribute(SecurityAction.RequestMinimum,All=@"c:\\temp")] class MainClass {
public static void Main()
{
FileStream fsOut = File.Create(@"c:\\temp\\test.txt");
StreamWriter sw = new StreamWriter(fsOut);
sw.WriteLine("str");
sw.Flush();
sw.Close();
}
}</source>
Requesting optional permissions
<source lang="csharp">using System; using System.IO; using System.Security.Permissions; [assembly:FileIOPermissionAttribute(SecurityAction.RequestOptional,All=@"c:\\temp")] class MainClass {
public static void Main()
{
FileStream fsOut = File.Create(@"c:\\temp\\test.txt");
StreamWriter sw = new StreamWriter(fsOut);
sw.WriteLine("str");
sw.Flush();
sw.Close();
}
}</source>
