Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Security / Policy / CodeGroup.cs / 1305376 / CodeGroup.cs
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
// CodeGroup.cs
//
// [....]
//
// Representation for code groups used for the policy mechanism
//
namespace System.Security.Policy {
using System;
using System.Security.Util;
using System.Security;
using System.Collections;
using System.Globalization;
using System.Diagnostics.Contracts;
internal interface IUnionSemanticCodeGroup
{
PolicyStatement InternalResolve( Evidence evidence );
}
[Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
abstract public class CodeGroup
{
private IMembershipCondition m_membershipCondition;
private IList m_children;
private PolicyStatement m_policy;
private SecurityElement m_element;
private PolicyLevel m_parentLevel;
private String m_name;
private String m_description;
internal CodeGroup()
{
}
internal CodeGroup( IMembershipCondition membershipCondition, PermissionSet permSet )
{
Contract.Assert( membershipCondition != null, "membershipCondition != null" );
Contract.Assert( permSet != null, "permSet != null" );
m_membershipCondition = membershipCondition;
m_policy = new PolicyStatement();
m_policy.SetPermissionSetNoCopy( permSet );
m_children = ArrayList.Synchronized( new ArrayList() );
m_element = null;
m_parentLevel = null;
}
protected CodeGroup( IMembershipCondition membershipCondition, PolicyStatement policy )
{
if (membershipCondition == null)
throw new ArgumentNullException( "membershipCondition" );
Contract.EndContractBlock();
if (policy == null)
m_policy = null;
else
m_policy = policy.Copy();
m_membershipCondition = membershipCondition.Copy();
m_children = ArrayList.Synchronized( new ArrayList() );
m_element = null;
m_parentLevel = null;
}
[System.Security.SecuritySafeCritical] // auto-generated
public void AddChild( CodeGroup group )
{
if (group == null)
throw new ArgumentNullException("group");
Contract.EndContractBlock();
if (m_children == null)
ParseChildren();
lock (this)
{
m_children.Add( group.Copy() );
}
}
[System.Security.SecurityCritical] // auto-generated
internal void AddChildInternal( CodeGroup group )
{
if (group == null)
throw new ArgumentNullException("group");
Contract.EndContractBlock();
if (m_children == null)
ParseChildren();
lock (this)
{
m_children.Add( group );
}
}
[System.Security.SecuritySafeCritical] // auto-generated
public void RemoveChild( CodeGroup group )
{
if (group == null)
return;
if (m_children == null)
ParseChildren();
lock (this )
{
int index = m_children.IndexOf( group );
if (index != -1)
{
m_children.RemoveAt( index );
}
}
}
public IList Children
{
[System.Security.SecuritySafeCritical] // auto-generated
get
{
if (m_children == null)
ParseChildren();
lock (this)
{
IList newList = new ArrayList( m_children.Count );
IEnumerator enumerator = m_children.GetEnumerator();
while (enumerator.MoveNext())
{
newList.Add( ((CodeGroup)enumerator.Current).Copy() );
}
return newList;
}
}
set
{
if (value == null)
throw new ArgumentNullException( "Children" );
Contract.EndContractBlock();
ArrayList children = ArrayList.Synchronized( new ArrayList( value.Count ) );
IEnumerator enumerator = value.GetEnumerator();
while (enumerator.MoveNext())
{
CodeGroup group = enumerator.Current as CodeGroup;
if (group == null)
throw new ArgumentException( Environment.GetResourceString( "Argument_CodeGroupChildrenMustBeCodeGroups" ) );
children.Add( group.Copy() );
}
m_children = children;
}
}
[System.Security.SecurityCritical] // auto-generated
internal IList GetChildrenInternal()
{
if (m_children == null)
ParseChildren();
return m_children;
}
public IMembershipCondition MembershipCondition
{
[System.Security.SecuritySafeCritical] // auto-generated
get
{
if (m_membershipCondition == null && m_element != null)
ParseMembershipCondition();
return m_membershipCondition.Copy();
}
set
{
if (value == null)
throw new ArgumentNullException( "MembershipCondition" );
Contract.EndContractBlock();
m_membershipCondition = value.Copy();
}
}
public PolicyStatement PolicyStatement
{
[System.Security.SecuritySafeCritical] // auto-generated
get
{
if (m_policy == null && m_element != null)
ParsePolicy();
if (m_policy != null)
return m_policy.Copy();
else
return null;
}
set
{
if (value != null)
m_policy = value.Copy();
else
m_policy = null;
}
}
public String Name
{
get
{
return m_name;
}
set
{
m_name = value;
}
}
public String Description
{
get
{
return m_description;
}
set
{
m_description = value;
}
}
public abstract PolicyStatement Resolve( Evidence evidence );
public abstract CodeGroup ResolveMatchingCodeGroups( Evidence evidence );
public abstract CodeGroup Copy();
public virtual String PermissionSetName
{
[System.Security.SecuritySafeCritical] // auto-generated
get
{
if (m_policy == null && m_element != null)
ParsePolicy();
if (m_policy == null)
return null;
NamedPermissionSet permSet = m_policy.GetPermissionSetNoCopy() as NamedPermissionSet;
if (permSet != null)
{
return permSet.Name;
}
else
{
return null;
}
}
}
public virtual String AttributeString
{
[System.Security.SecuritySafeCritical] // auto-generated
get
{
if (m_policy == null && m_element != null)
ParsePolicy();
if (m_policy != null)
return m_policy.AttributeString;
else
return null;
}
}
public abstract String MergeLogic
{
get;
}
[System.Security.SecuritySafeCritical] // auto-generated
public SecurityElement ToXml()
{
return ToXml( null );
}
public void FromXml( SecurityElement e )
{
FromXml( e, null );
}
[System.Security.SecuritySafeCritical] // auto-generated
public SecurityElement ToXml( PolicyLevel level )
{
return ToXml( level, GetTypeName() );
}
internal virtual String GetTypeName()
{
return this.GetType().FullName;
}
[System.Security.SecurityCritical] // auto-generated
internal SecurityElement ToXml( PolicyLevel level, String policyClassName )
{
if (m_membershipCondition == null && m_element != null)
ParseMembershipCondition();
if (m_children == null)
ParseChildren();
if (m_policy == null && m_element != null)
ParsePolicy();
SecurityElement e = new SecurityElement( "CodeGroup" );
System.Security.Util.XMLUtil.AddClassAttribute( e, this.GetType(), policyClassName );
// If you hit this assert then most likely you are trying to change the name of this class.
// This is ok as long as you change the hard coded string above and change the assert below.
Contract.Assert( this.GetType().FullName.Equals( policyClassName ), "Incorrect class name passed in! Was: " + policyClassName + " Should be " + this.GetType().FullName);
e.AddAttribute( "version", "1" );
e.AddChild( m_membershipCondition.ToXml( level ) );
// Grab the inerts of the policy statement's xml and just stick it
// into the code group xml directly. We do this to hide the policy statement from
// users in the config file.
if (m_policy != null)
{
PermissionSet permSet = m_policy.GetPermissionSetNoCopy();
NamedPermissionSet namedPermSet = permSet as NamedPermissionSet;
if (namedPermSet != null && level != null && level.GetNamedPermissionSetInternal( namedPermSet.Name ) != null)
{
e.AddAttribute( "PermissionSetName", namedPermSet.Name );
}
else
{
if (!permSet.IsEmpty())
e.AddChild( permSet.ToXml() );
}
if (m_policy.Attributes != PolicyStatementAttribute.Nothing)
e.AddAttribute( "Attributes", XMLUtil.BitFieldEnumToString( typeof( PolicyStatementAttribute ), m_policy.Attributes ) );
}
if (m_children.Count > 0)
{
lock (this)
{
IEnumerator enumerator = m_children.GetEnumerator();
while (enumerator.MoveNext())
{
e.AddChild( ((CodeGroup)enumerator.Current).ToXml( level ) );
}
}
}
if (m_name != null)
{
e.AddAttribute( "Name", SecurityElement.Escape( m_name ) );
}
if (m_description != null)
{
e.AddAttribute( "Description", SecurityElement.Escape( m_description ) );
}
CreateXml( e, level );
return e;
}
protected virtual void CreateXml( SecurityElement element, PolicyLevel level )
{
}
public void FromXml( SecurityElement e, PolicyLevel level )
{
if (e == null)
throw new ArgumentNullException("e");
Contract.EndContractBlock();
lock (this)
{
m_element = e;
m_parentLevel = level;
m_children = null;
m_membershipCondition = null;
m_policy = null;
m_name = e.Attribute( "Name" );
m_description = e.Attribute( "Description" );
ParseXml( e, level );
}
}
protected virtual void ParseXml( SecurityElement e, PolicyLevel level )
{
}
[System.Security.SecurityCritical] // auto-generated
private bool ParseMembershipCondition( bool safeLoad )
{
lock (this)
{
IMembershipCondition membershipCondition = null;
SecurityElement elMembershipCondition = m_element.SearchForChildByTag( "IMembershipCondition" );
if (elMembershipCondition != null)
{
try
{
membershipCondition = System.Security.Util.XMLUtil.CreateMembershipCondition( elMembershipCondition );
if (membershipCondition == null)
return false;
}
catch (Exception ex)
{
throw new ArgumentException( Environment.GetResourceString( "Argument_MembershipConditionElement" ), ex );
}
// catch
// {
// throw new ArgumentException( Environment.GetResourceString( "Argument_MembershipConditionElement" ) );
// }
membershipCondition.FromXml( elMembershipCondition, m_parentLevel );
}
else
{
throw new ArgumentException( String.Format( CultureInfo.CurrentCulture, Environment.GetResourceString( "Argument_InvalidXMLElement" ), "IMembershipCondition", this.GetType().FullName ) );
}
m_membershipCondition = membershipCondition;
return true;
}
}
[System.Security.SecurityCritical] // auto-generated
private void ParseMembershipCondition()
{
ParseMembershipCondition( false );
}
[System.Security.SecurityCritical] // auto-generated
internal void ParseChildren()
{
lock (this)
{
ArrayList childrenList = ArrayList.Synchronized( new ArrayList() );
if (m_element != null && m_element.InternalChildren != null)
{
// We set the elements childrenList to a list that contains no code groups that are in
// assemblies that have not yet been loaded. This guarantees that if
// we recurse while loading the child code groups or their membership conditions
// that we won't get back to this point to create an infinite recursion.
m_element.Children = (ArrayList)m_element.InternalChildren.Clone();
// We need to keep track of which children are not parsed and created in our
// first pass through the list of children, including what position they were
// at originally so that we can add them back in as we do parse them.
ArrayList unparsedChildren = ArrayList.Synchronized( new ArrayList() );
Evidence evidence = new Evidence();
int childCount = m_element.InternalChildren.Count;
int i = 0;
while (i < childCount)
{
SecurityElement elGroup = (SecurityElement)m_element.Children[i];
if (elGroup.Tag.Equals( "CodeGroup" ))
{
// Using safe load here to guarantee that we don't load any assemblies that aren't
// already loaded. If we find a code group or membership condition that is defined
// in an assembly that is not yet loaded, we will remove the corresponding element
// from the list of child elements as to avoid the infinite recursion, and then
// add them back in later.
CodeGroup group = System.Security.Util.XMLUtil.CreateCodeGroup( elGroup );
if (group != null)
{
group.FromXml( elGroup, m_parentLevel );
// We want to touch the membership condition to make sure it is loaded
// before we put the code group in a place where Resolve will touch it.
// This is critical in negotiating our recursive resolve scenario.
if (ParseMembershipCondition( true ))
{
// In addition, we need to touch several methods to make sure they are jitted previous
// to a Resolve happening with this code gropu in the hierarchy. We can run into
// recursive cases where if you have a method that touchs an assembly that does
// a resolve at load time (permission request, execution checking) that you recurse around
// and end up trying to jit the same method again.
group.Resolve( evidence );
group.MembershipCondition.Check( evidence );
// Now it should be ok to add the group to the hierarchy.
childrenList.Add( group );
// Increment the count since we are done with this child
++i;
}
else
{
// Assembly that holds the membership condition is not loaded, remove
// the child from the list.
m_element.InternalChildren.RemoveAt( i );
// Note: we do not increment the counter since the value at 'i' should
// now be what was at 'i+1' previous to the RemoveAt( i ) above. However,
// we do need to update the count of children in the list
childCount = m_element.InternalChildren.Count;
// Add this child to the unparsed child list.
unparsedChildren.Add( new CodeGroupPositionMarker( i, childrenList.Count, elGroup ) );
}
}
else
{
// Assembly that holds the code group is not loaded, remove
// the child from the list.
m_element.InternalChildren.RemoveAt( i );
// Note: we do not increment the counter since the value at 'i' should
// now be what was at 'i+1' previous to the RemoveAt( i ) above. However,
// we do need to update the count of children in the list
childCount = m_element.InternalChildren.Count;
// Add this child to the unparsed child list.
unparsedChildren.Add( new CodeGroupPositionMarker( i, childrenList.Count, elGroup ) );
}
}
else
{
// The current tag is not an tag, so we just skip it.
++i;
}
}
// Now we have parsed all the children that only use classes in already loaded
// assemblies. Now go through the process of loading the needed classes (and
// therefore assemblies) and building the objects in the order that they
// appear in the list of children (which is the same as they now appear in the
// list of unparsed children since we always added to the back of the list).
// As each is parsed, add that child back into the list of children since they
// can now be parsed without loading any additional assemblies.
IEnumerator enumerator = unparsedChildren.GetEnumerator();
while (enumerator.MoveNext())
{
CodeGroupPositionMarker marker = (CodeGroupPositionMarker)enumerator.Current;
CodeGroup group = System.Security.Util.XMLUtil.CreateCodeGroup( marker.element );
if (group != null)
{
group.FromXml( marker.element, m_parentLevel );
// We want to touch the membership condition to make sure it is loaded
// before we put the code group in a place where Resolve will touch it.
// This is critical in negotiating our recursive resolve scenario.
group.Resolve( evidence );
group.MembershipCondition.Check( evidence );
// Now it should be ok to add the group to the hierarchy.
childrenList.Insert( marker.groupIndex, group );
// Add the element back into the child list in the proper spot.
m_element.InternalChildren.Insert( marker.elementIndex, marker.element );
}
else
{
throw new ArgumentException( String.Format( CultureInfo.CurrentCulture, Environment.GetResourceString( "Argument_FailedCodeGroup" ), marker.element.Attribute( "class" ) ) );
}
}
}
m_children = childrenList;
}
}
private void ParsePolicy()
{
// There is a potential deadlock situation here
// since the PolicyStatement.FromXml method calls
// into PolicyLevel and we are holding this CodeGroup's lock.
// We solve this by releasing the lock for the duration of
// the FromXml call, but this leads us into some race conditions
// with other threads trying to alter the state of this object.
// The trickiest of these is the case from FromXml gets called on
// this object, in which case we will loop and try the decode again.
while (true)
{
PolicyStatement policy = new PolicyStatement();
bool needToParse = false;
SecurityElement elPolicy = new SecurityElement( "PolicyStatement" );
elPolicy.AddAttribute( "version", "1" );
SecurityElement localRef = m_element;
lock (this)
{
// We create an xml representation of a policy statement from the
// xml for a code group. We do this to hide the policy statement from
// users in the config file.
if (m_element != null)
{
String permSetName = m_element.Attribute( "PermissionSetName" );
if (permSetName != null)
{
elPolicy.AddAttribute( "PermissionSetName", permSetName );
needToParse = true;
}
else
{
SecurityElement elPermSet = m_element.SearchForChildByTag( "PermissionSet" );
if (elPermSet != null)
{
elPolicy.AddChild( elPermSet );
needToParse = true;
}
else
{
elPolicy.AddChild( new PermissionSet( false ).ToXml() );
needToParse = true;
}
}
String attributes = m_element.Attribute( "Attributes" );
if (attributes != null)
{
elPolicy.AddAttribute( "Attributes", attributes );
needToParse = true;
}
}
}
if (needToParse)
policy.FromXml( elPolicy, m_parentLevel );
else
policy.PermissionSet = null;
lock (this)
{
if (localRef == m_element && m_policy == null)
{
m_policy = policy;
break;
}
else if (m_policy != null)
{
break;
}
}
}
if (m_policy != null && m_children != null && m_membershipCondition != null)
{
//m_element = null;
//m_parentLevel = null;
}
}
[System.Security.SecuritySafeCritical] // auto-generated
public override bool Equals( Object o)
{
CodeGroup that = (o as CodeGroup);
if (that != null && this.GetType().Equals( that.GetType() ))
{
if (Equals( this.m_name, that.m_name ) &&
Equals( this.m_description, that.m_description ))
{
if (this.m_membershipCondition == null && this.m_element != null)
this.ParseMembershipCondition();
if (that.m_membershipCondition == null && that.m_element != null)
that.ParseMembershipCondition();
if (Equals( this.m_membershipCondition, that.m_membershipCondition ))
{
return true;
}
}
}
return false;
}
[System.Security.SecuritySafeCritical] // auto-generated
public bool Equals( CodeGroup cg, bool compareChildren)
{
if (!this.Equals( cg )) return false;
if (compareChildren)
{
if (this.m_children == null)
this.ParseChildren();
if (cg.m_children == null)
cg.ParseChildren();
ArrayList list1 = new ArrayList(this.m_children);
ArrayList list2 = new ArrayList(cg.m_children);
if (list1.Count != list2.Count) return false;
for (int i = 0; i < list1.Count; i++)
{
if (!((CodeGroup) list1[i]).Equals( (CodeGroup) list2[i], true ))
{
return false;
}
}
}
return true;
}
[System.Security.SecuritySafeCritical] // auto-generated
public override int GetHashCode()
{
if (m_membershipCondition == null && m_element != null)
ParseMembershipCondition();
if (m_name != null || m_membershipCondition != null)
{
return (m_name == null ? 0 : m_name.GetHashCode())
+ (m_membershipCondition == null ? 0 : m_membershipCondition.GetHashCode());
}
else
{
return GetType().GetHashCode();
}
}
}
internal class CodeGroupPositionMarker
{
internal int elementIndex;
internal int groupIndex;
internal SecurityElement element;
internal CodeGroupPositionMarker( int elementIndex, int groupIndex, SecurityElement element )
{
this.elementIndex = elementIndex;
this.groupIndex = groupIndex;
this.element = element;
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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