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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
// Represents the policy associated with some piece of evidence
//
using System.Diagnostics.Contracts;
namespace System.Security.Policy {
using System;
using System.Security;
using System.Security.Util;
using Math = System.Math;
using System.Collections;
using System.Collections.Generic;
using System.Security.Permissions;
using System.Text;
using System.Globalization;
[Serializable]
[Flags]
[System.Runtime.InteropServices.ComVisible(true)]
public enum PolicyStatementAttribute
{
Nothing = 0x0,
Exclusive = 0x01,
LevelFinal = 0x02,
All = 0x03,
}
[Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
sealed public class PolicyStatement : ISecurityPolicyEncodable, ISecurityEncodable
{
// The PermissionSet associated with this policy
internal PermissionSet m_permSet;
// The bitfield of inheritance properties associated with this policy
internal PolicyStatementAttribute m_attributes;
internal PolicyStatement()
{
m_permSet = null;
m_attributes = PolicyStatementAttribute.Nothing;
}
public PolicyStatement( PermissionSet permSet )
: this( permSet, PolicyStatementAttribute.Nothing )
{
}
public PolicyStatement( PermissionSet permSet, PolicyStatementAttribute attributes )
{
if (permSet == null)
{
m_permSet = new PermissionSet( false );
}
else
{
m_permSet = permSet.Copy();
}
if (ValidProperties( attributes ))
{
m_attributes = attributes;
}
}
private PolicyStatement( PermissionSet permSet, PolicyStatementAttribute attributes, bool copy )
{
if (permSet != null)
{
if (copy)
m_permSet = permSet.Copy();
else
m_permSet = permSet;
}
else
{
m_permSet = new PermissionSet( false );
}
m_attributes = attributes;
}
public PermissionSet PermissionSet
{
get
{
lock (this)
{
return m_permSet.Copy();
}
}
set
{
lock (this)
{
if (value == null)
{
m_permSet = new PermissionSet( false );
}
else
{
m_permSet = value.Copy();
}
}
}
}
internal void SetPermissionSetNoCopy( PermissionSet permSet )
{
m_permSet = permSet;
}
internal PermissionSet GetPermissionSetNoCopy()
{
lock (this)
{
return m_permSet;
}
}
public PolicyStatementAttribute Attributes
{
get
{
return m_attributes;
}
set
{
if (ValidProperties( value ))
{
m_attributes = value;
}
}
}
public PolicyStatement Copy()
{
// The PolicyStatement .ctor will copy the permission set
return new PolicyStatement(m_permSet, Attributes, true);
}
public String AttributeString
{
get
{
StringBuilder sb = new StringBuilder();
bool first = true;
if (GetFlag((int) PolicyStatementAttribute.Exclusive ))
{
sb.Append( "Exclusive" );
first = false;
}
if (GetFlag((int) PolicyStatementAttribute.LevelFinal ))
{
if (!first)
sb.Append( " " );
sb.Append( "LevelFinal" );
}
return sb.ToString();
}
}
private static bool ValidProperties( PolicyStatementAttribute attributes )
{
if ((attributes & ~(PolicyStatementAttribute.All)) == 0)
{
return true;
}
else
{
throw new ArgumentException( Environment.GetResourceString( "Argument_InvalidFlag" ) );
}
}
private bool GetFlag( int flag )
{
return (flag & (int)m_attributes) != 0;
}
/// <summary>
/// Union a child policy statement into this policy statement
/// </summary>
internal void InplaceUnion(PolicyStatement childPolicy)
{
BCLDebug.Assert(childPolicy != null, "childPolicy != null");
if (((Attributes & childPolicy.Attributes) & PolicyStatementAttribute.Exclusive) == PolicyStatementAttribute.Exclusive)
{
throw new PolicyException(Environment.GetResourceString( "Policy_MultipleExclusive" ));
}
// We need to merge together our grant set and attributes. The result of this merge is
// dependent upon if we're merging a child marked exclusive or not. If the child is not
// exclusive, we need to union in its grant set and or in its attributes. However, if the child
// is exclusive then it is the only code group which should have an effect on the resulting
// grant set and therefore our grant should be ignored.
if ((childPolicy.Attributes & PolicyStatementAttribute.Exclusive) == PolicyStatementAttribute.Exclusive)
{
m_permSet = childPolicy.GetPermissionSetNoCopy();
Attributes = childPolicy.Attributes;
}
else
{
m_permSet.InplaceUnion(childPolicy.GetPermissionSetNoCopy());
Attributes = Attributes | childPolicy.Attributes;
}
}
[System.Runtime.InteropServices.ComVisible(false)]
public override bool Equals( Object obj )
{
PolicyStatement other = obj as PolicyStatement;
if (other == null)
return false;
if (this.m_attributes != other.m_attributes)
return false;
if (!Object.Equals( this.m_permSet, other.m_permSet ))
return false;
return true;
}
[System.Runtime.InteropServices.ComVisible(false)]
public override int GetHashCode()
{
int accumulator = (int)this.m_attributes;
if (m_permSet != null)
accumulator = accumulator ^ m_permSet.GetHashCode();
return accumulator;
}
}
}
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