SecurityFrame.cs :  » 2.6.4-mono-.net-core » System.Security » System » Security » C# / CSharp Open Source

//
// System.Security.SecurityFrame.cs
//
// Authors:
//  Sebastien Pouliot  <sebastien@ximian.com>
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System.Collections;
using System.Globalization;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Security.Permissions;
using System.Text;

namespace System.Security{

  // Must match MonoDeclSecurityEntry in /mono/metadata/reflection.h
  internal struct RuntimeDeclSecurityEntry {
    public IntPtr blob;
    public int size;
    public int index;
  }

  // Must match MonoSecurityFrame in /mono/mini/declsec.h
#pragma warning disable 649  
  internal class RuntimeSecurityFrame {
    public AppDomain domain;
    public MethodInfo method;
    public RuntimeDeclSecurityEntry assert;
    public RuntimeDeclSecurityEntry deny;
    public RuntimeDeclSecurityEntry permitonly;
  }
#pragma warning restore 649  

#if !MOONLIGHT
  internal struct SecurityFrame {

    private AppDomain _domain;
    private MethodInfo _method;
    private PermissionSet _assert;
    private PermissionSet _deny;
    private PermissionSet _permitonly;

    [MethodImplAttribute (MethodImplOptions.InternalCall)]
    extern static RuntimeSecurityFrame _GetSecurityFrame (int skip);

    [MethodImplAttribute (MethodImplOptions.InternalCall)]
    extern static Array _GetSecurityStack (int skip);

    internal SecurityFrame (RuntimeSecurityFrame frame)
    {
      _domain = null;
      _method = null;
      _assert = null;
      _deny = null;
      _permitonly = null;
      InitFromRuntimeFrame (frame);
    }

    internal SecurityFrame (int skip)
    {
      _domain = null;
      _method = null;
      _assert = null;
      _deny = null;
      _permitonly = null;

      InitFromRuntimeFrame (_GetSecurityFrame (skip + 2));

      // TODO - add the imperative informations into the frame
    }

    // Note: SecurityManager.Decode implements a cache - so not every call
    // ends up making an icall
    internal void InitFromRuntimeFrame (RuntimeSecurityFrame frame)
    {
      _domain = frame.domain;
      _method = frame.method;

      if (frame.assert.size > 0) {
        _assert = SecurityManager.Decode (frame.assert.blob, frame.assert.size);
      }
      if (frame.deny.size > 0) {
        _deny = SecurityManager.Decode (frame.deny.blob, frame.deny.size);
      }
      if (frame.permitonly.size > 0) {
        _permitonly = SecurityManager.Decode (frame.permitonly.blob, frame.permitonly.size);
      }
    }

    public Assembly Assembly {
      get { return _method.ReflectedType.Assembly; }
    }

    public AppDomain Domain {
      get { return _domain; }
    }

    public MethodInfo Method {
      get { return _method; }
    }

    public PermissionSet Assert {
      get { return _assert; }
    }

    public PermissionSet Deny {
      get { return _deny; }
    }

    public PermissionSet PermitOnly {
      get { return _permitonly; }
    }

    public bool HasStackModifiers {
      get { return ((_assert != null) || (_deny != null) || (_permitonly != null)); }
    }

    public bool Equals (SecurityFrame sf)
    {
      if (!Object.ReferenceEquals (_domain, sf.Domain))
        return false;
      if (Assembly.ToString () != sf.Assembly.ToString ())
        return false;
      if (Method.ToString () != sf.Method.ToString ())
        return false;

      if ((_assert != null) && !_assert.Equals (sf.Assert))
        return false;
      if ((_deny != null) && !_deny.Equals (sf.Deny))
        return false;
      if ((_permitonly != null) && !_permitonly.Equals (sf.PermitOnly))
        return false;

      return true;
    }

    public override string ToString ()
    {
      StringBuilder sb = new StringBuilder ();
      sb.AppendFormat ("Frame: {0}{1}", _method, Environment.NewLine);
      sb.AppendFormat ("\tAppDomain: {0}{1}", Domain, Environment.NewLine);
      sb.AppendFormat ("\tAssembly: {0}{1}", Assembly, Environment.NewLine);
      if (_assert != null)
        sb.AppendFormat ("\tAssert: {0}{1}", _assert, Environment.NewLine);
      if (_deny != null)
        sb.AppendFormat ("\tDeny: {0}{1}", _deny, Environment.NewLine);
      if (_permitonly != null)
        sb.AppendFormat ("\tPermitOnly: {0}{1}", _permitonly, Environment.NewLine);
      return sb.ToString ();
    }

    static public ArrayList GetStack (int skipFrames)
    {
      Array stack = _GetSecurityStack (skipFrames+2);
      ArrayList al = new ArrayList ();
      for (int i = 0; i < stack.Length; i++) {
        object o = stack.GetValue (i);
        // null are unused slots allocated in the runtime
        if (o == null)
          break;
        al.Add (new SecurityFrame ((RuntimeSecurityFrame)o));
      }
      return al;
    }
  }
#endif
}