Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Framework / MS / Internal / AppModel / PresentationAppDomainManager.cs / 2 / PresentationAppDomainManager.cs
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
// Description:
// Implements a custom AppDomainManager.
//
//---------------------------------------------------------------------------
using System;
using System.Net;
using System.Reflection;
using System.Runtime.Remoting;
using System.Security;
using System.Security.Permissions;
using System.Security.Policy;
using System.Runtime.Hosting;
using System.Text;
using MS.Win32;
using MS.Internal;
using MS.Internal.AppModel;
using MS.Internal.Utility;
using MS.Utility;
namespace System.Windows.Interop
{
internal class PresentationHostSecurityManager : HostSecurityManager
{
///
/// Critical - HostSecurityManager..ctor LinkDemand's. This class should not be called directly by PT'ed callers, since it can interfere with
/// the privileges an AppDomain gets.
///
[SecurityCritical]
internal PresentationHostSecurityManager()
{
}
///
/// Critical:
/// 1) accesses critical data AppDomain.CurrentDomain.SetupInformation.ActivationArguments
/// and sets BrowserInteropHelper.IsBrowserHosted.
/// 2) calls the critical AddPermissionForUri().
/// Safe:
/// 1) does not expose critical data; BrowserInteropHelper.IsBrowserHosted is set to true, as it
/// has to be.
/// 2) The additional permission added is to the "fake" site-of-origin used for debugging.
///
[SecurityCritical, SecurityTreatAsSafe]
public override ApplicationTrust DetermineApplicationTrust(Evidence applicationEvidence, Evidence activatorEvidence, TrustManagerContext context)
{
if (EventTrace.IsEnabled(EventTrace.Flags.performance, EventTrace.Level.verbose))
{
EventTrace.EventProvider.TraceEvent(
EventTrace.Level.verbose, EventTrace.GuidFromId(EventTraceGuidId.HOSTINGGUID), (byte)EventTrace.HostingEvent.DetermineApplicationTrustStart);
}
ApplicationTrust trust;
Uri activationUri = GetUriFromActivationData(0);
bool isDebug = PresentationAppDomainManager.IsDebug ? true : GetBoolFromActivationData(1);
BrowserInteropHelper.SetBrowserHosted(true);
if (isDebug)
{
context.IgnorePersistedDecision = true;
context.Persist = false;
context.KeepAlive = false;
context.NoPrompt = true;
trust = base.DetermineApplicationTrust(applicationEvidence, activatorEvidence, context);
Uri debugSecurityZoneURL = GetUriFromActivationData(2);
if (debugSecurityZoneURL != null)
{
PermissionSet permissions = trust.DefaultGrantSet.PermissionSet;
trust.DefaultGrantSet.PermissionSet = AddPermissionForUri(permissions, debugSecurityZoneURL);
}
}
else
{
// Defense in depth. Should never get to this point and require this to be
// set, but just in case, we do this so that we will never get a trust
// prompt even if something goes wrong somewhere else.
context.NoPrompt = true;
trust = base.DetermineApplicationTrust(applicationEvidence, activatorEvidence, context);
}
if (EventTrace.IsEnabled(EventTrace.Flags.performance, EventTrace.Level.verbose))
{
EventTrace.EventProvider.TraceEvent(
EventTrace.Level.verbose, EventTrace.GuidFromId(EventTraceGuidId.HOSTINGGUID), (byte)EventTrace.HostingEvent.DetermineApplicationTrustEnd);
}
return trust;
}
///
/// Critical - because adds permission to default permissionset granted by trustmanager.
/// CAUTION: If srcUri denotes a directory path, it must end with '/'. Otherwise permission will
/// be granted to the parent directory.
///
[SecurityCritical]
internal static PermissionSet AddPermissionForUri(PermissionSet originalPermSet, Uri srcUri)
{
PermissionSet newPermSet = originalPermSet;
if (srcUri != null)
{
Evidence evidence = new Evidence();
evidence.AddHost(new Url(BindUriHelper.UriToString(srcUri))); // important: the parameter must be a UrL object not a UrI object
IMembershipCondition membership = new UrlMembershipCondition(BindUriHelper.UriToString(srcUri));
CodeGroup group = (srcUri.IsFile) ?
(CodeGroup)new FileCodeGroup(membership, FileIOPermissionAccess.Read | FileIOPermissionAccess.PathDiscovery)
:(CodeGroup)new NetCodeGroup(membership);
PolicyStatement policy = group.Resolve(evidence);
if (!policy.PermissionSet.IsEmpty())
{
newPermSet = originalPermSet.Union(policy.PermissionSet);
}
}
return newPermSet;
}
///
/// Critical - because this accesses critical data AppDomain.CurrentDomain.SetupInformation.ActivationArguments.
/// Safe - because this does not expose that string.
///
[SecurityCritical, SecurityTreatAsSafe]
private bool GetBoolFromActivationData(int index)
{
bool flag = false; // default
if (AppDomain.CurrentDomain.SetupInformation.ActivationArguments != null &&
AppDomain.CurrentDomain.SetupInformation.ActivationArguments.ActivationData.Length > index)
{
if (AppDomain.CurrentDomain.SetupInformation.ActivationArguments.ActivationData[index] == true.ToString())
{
flag = true;
}
}
return flag;
}
///
/// Critical - because this accesses critical data AppDomain.CurrentDomain.SetupInformation.ActivationArguments.
/// Safe - because this does not expose that string.
///
[SecurityCritical, SecurityTreatAsSafe]
private Uri GetUriFromActivationData(int index)
{
Uri uri = null;
if (AppDomain.CurrentDomain.SetupInformation.ActivationArguments != null &&
AppDomain.CurrentDomain.SetupInformation.ActivationArguments.ActivationData.Length > index)
{
if (!string.IsNullOrEmpty(AppDomain.CurrentDomain.SetupInformation.ActivationArguments.ActivationData[index]))
{
uri = new UriBuilder(AppDomain.CurrentDomain.SetupInformation.ActivationArguments.ActivationData[index]).Uri;
}
}
return uri;
}
}
// This is the custom ApplicationActivator that will be returned by
// the PresentationAppDomainManager.ApplicationActivator property.
// CreateInstance will be called twice: the first time to create
// the new AppDomain, and the second time to create the app inside
// of the new AppDomain.
internal class PresentationApplicationActivator : System.Runtime.Hosting.ApplicationActivator
{
///
/// Critical - because this does an elevation to get the ID string.
/// Safe - because this does not expose that string.
///
[SecurityCritical, SecurityTreatAsSafe]
public override ObjectHandle CreateInstance(ActivationContext actCtx)
{
if (EventTrace.IsEnabled(EventTrace.Flags.performance, EventTrace.Level.verbose))
{
EventTrace.EventProvider.TraceEvent(
EventTrace.Level.verbose, EventTrace.GuidFromId(EventTraceGuidId.HOSTINGGUID), (byte)EventTrace.HostingEvent.ApplicationActivatorCreateInstanceStart,
PresentationAppDomainManager.ActivationUri != null ? PresentationAppDomainManager.ActivationUri.ToString() : string.Empty);
}
ObjectHandle oh;
if (PresentationAppDomainManager.ActivationUri != null)
{
oh = base.CreateInstance(
actCtx,
new string[] {
BindUriHelper.UriToString(PresentationAppDomainManager.ActivationUri),
PresentationAppDomainManager.IsDebug.ToString(),
(PresentationAppDomainManager.DebugSecurityZoneURL == null?
string.Empty
: PresentationAppDomainManager.DebugSecurityZoneURL.ToString())});
}
else
{
oh = base.CreateInstance(actCtx);
}
bool returnAppDomain = false;
try
{
new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Assert(); // BlessedAssert:
if (AppDomain.CurrentDomain.ActivationContext != null &&
AppDomain.CurrentDomain.ActivationContext.Identity.ToString().Equals(actCtx.Identity.ToString()))
{
returnAppDomain = true;
}
}
finally
{
CodeAccessPermission.RevertAssert();
}
if (EventTrace.IsEnabled(EventTrace.Flags.performance, EventTrace.Level.verbose))
{
EventTrace.EventProvider.TraceEvent(EventTrace.Level.verbose, EventTrace.GuidFromId(EventTraceGuidId.HOSTINGGUID), (byte)EventTrace.HostingEvent.ApplicationActivatorCreateInstanceEnd);
}
if (returnAppDomain)
{
// this is the server domain
return new ObjectHandle(AppDomain.CurrentDomain);
}
else
{
return oh;
}
}
}
// This is a custom AppDomainManager class we're using. We need to set the
// assembly name and class name in the environment for CLR to use it. We
// need to use this to detect new AppDomain creation.
internal class PresentationAppDomainManager : AppDomainManager
{
///
/// Critical: Initializes Critical data
///
[SecurityCritical, SecurityTreatAsSafe]
static PresentationAppDomainManager()
{
if (EventTrace.IsEnabled(EventTrace.Flags.performance, EventTrace.Level.verbose))
{
EventTrace.EventProvider.TraceEvent(EventTrace.Level.verbose, EventTrace.GuidFromId(EventTraceGuidId.HOSTINGGUID), (byte)EventTrace.HostingEvent.AppDomainManagerCctor);
}
}
///
/// Critical: Base class has link demnd and inheritance demand
///
[SecurityCritical]
public PresentationAppDomainManager()
{
}
public override ApplicationActivator ApplicationActivator
{
get
{
if (_appActivator == null)
_appActivator = new PresentationApplicationActivator();
return _appActivator;
}
}
///
/// Critical: This hooks up the assembly filter which we want to prevent arbitrary code from doing.
///
[SecurityCritical]
public override void InitializeNewDomain(AppDomainSetup appDomainInfo)
{
//Hookup the assembly load event
_assemblyFilter = new AssemblyFilter();
AppDomain.CurrentDomain.AssemblyLoad += new AssemblyLoadEventHandler(_assemblyFilter.FilterCallback);
}
///
/// Critical - get: Discloses a HostSecurityManager object
///
public override HostSecurityManager HostSecurityManager
{
[SecurityCritical]
get
{
if (_hostsecuritymanager == null)
{
_hostsecuritymanager = new PresentationHostSecurityManager();
}
return _hostsecuritymanager;
}
}
// Creates ApplicationProxyInternal. Creating it from Default domain will
// cause a stack walk for ReflectionPermission which will fail for partial
// trust apps.
///
/// Critical: This calls the critical ApplicationProxyInternal ctor
///
[SecurityCritical]
internal ApplicationProxyInternal CreateApplicationProxyInternal()
{
return new ApplicationProxyInternal();
}
internal static AppDomain NewAppDomain
{
get { return _newAppDomain; }
set { _newAppDomain = value; }
}
internal static bool SaveAppDomain
{
get { return _saveAppDomain; }
set
{
_saveAppDomain = value;
// Allow garbage collection to happen.
_newAppDomain = null;
}
}
internal static Uri ActivationUri
{
get { return _activationUri; }
set { _activationUri = value; }
}
internal static Uri DebugSecurityZoneURL
{
get { return _debugSecurityZoneURL; }
set { _debugSecurityZoneURL = value; }
}
internal static bool IsDebug
{
get { return _isdebug; }
set { _isdebug = value; }
}
private static bool _isdebug = false;
private ApplicationActivator _appActivator = null;
///
/// It holds a HostSecurityManager object, which is critical and can interfere with the permissions that are assigned to an AppDomain.
///
[SecurityCritical]
private HostSecurityManager _hostsecuritymanager = null;
private static AppDomain _newAppDomain;
private static bool _saveAppDomain;
private static Uri _activationUri;
private static Uri _debugSecurityZoneURL;
///
/// Critical: This should not be exposed since it can be used to bring down process
///
[SecurityCritical]
private AssemblyFilter _assemblyFilter;
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
// Description:
// Implements a custom AppDomainManager.
//
//---------------------------------------------------------------------------
using System;
using System.Net;
using System.Reflection;
using System.Runtime.Remoting;
using System.Security;
using System.Security.Permissions;
using System.Security.Policy;
using System.Runtime.Hosting;
using System.Text;
using MS.Win32;
using MS.Internal;
using MS.Internal.AppModel;
using MS.Internal.Utility;
using MS.Utility;
namespace System.Windows.Interop
{
internal class PresentationHostSecurityManager : HostSecurityManager
{
///
/// Critical - HostSecurityManager..ctor LinkDemand's. This class should not be called directly by PT'ed callers, since it can interfere with
/// the privileges an AppDomain gets.
///
[SecurityCritical]
internal PresentationHostSecurityManager()
{
}
///
/// Critical:
/// 1) accesses critical data AppDomain.CurrentDomain.SetupInformation.ActivationArguments
/// and sets BrowserInteropHelper.IsBrowserHosted.
/// 2) calls the critical AddPermissionForUri().
/// Safe:
/// 1) does not expose critical data; BrowserInteropHelper.IsBrowserHosted is set to true, as it
/// has to be.
/// 2) The additional permission added is to the "fake" site-of-origin used for debugging.
///
[SecurityCritical, SecurityTreatAsSafe]
public override ApplicationTrust DetermineApplicationTrust(Evidence applicationEvidence, Evidence activatorEvidence, TrustManagerContext context)
{
if (EventTrace.IsEnabled(EventTrace.Flags.performance, EventTrace.Level.verbose))
{
EventTrace.EventProvider.TraceEvent(
EventTrace.Level.verbose, EventTrace.GuidFromId(EventTraceGuidId.HOSTINGGUID), (byte)EventTrace.HostingEvent.DetermineApplicationTrustStart);
}
ApplicationTrust trust;
Uri activationUri = GetUriFromActivationData(0);
bool isDebug = PresentationAppDomainManager.IsDebug ? true : GetBoolFromActivationData(1);
BrowserInteropHelper.SetBrowserHosted(true);
if (isDebug)
{
context.IgnorePersistedDecision = true;
context.Persist = false;
context.KeepAlive = false;
context.NoPrompt = true;
trust = base.DetermineApplicationTrust(applicationEvidence, activatorEvidence, context);
Uri debugSecurityZoneURL = GetUriFromActivationData(2);
if (debugSecurityZoneURL != null)
{
PermissionSet permissions = trust.DefaultGrantSet.PermissionSet;
trust.DefaultGrantSet.PermissionSet = AddPermissionForUri(permissions, debugSecurityZoneURL);
}
}
else
{
// Defense in depth. Should never get to this point and require this to be
// set, but just in case, we do this so that we will never get a trust
// prompt even if something goes wrong somewhere else.
context.NoPrompt = true;
trust = base.DetermineApplicationTrust(applicationEvidence, activatorEvidence, context);
}
if (EventTrace.IsEnabled(EventTrace.Flags.performance, EventTrace.Level.verbose))
{
EventTrace.EventProvider.TraceEvent(
EventTrace.Level.verbose, EventTrace.GuidFromId(EventTraceGuidId.HOSTINGGUID), (byte)EventTrace.HostingEvent.DetermineApplicationTrustEnd);
}
return trust;
}
///
/// Critical - because adds permission to default permissionset granted by trustmanager.
/// CAUTION: If srcUri denotes a directory path, it must end with '/'. Otherwise permission will
/// be granted to the parent directory.
///
[SecurityCritical]
internal static PermissionSet AddPermissionForUri(PermissionSet originalPermSet, Uri srcUri)
{
PermissionSet newPermSet = originalPermSet;
if (srcUri != null)
{
Evidence evidence = new Evidence();
evidence.AddHost(new Url(BindUriHelper.UriToString(srcUri))); // important: the parameter must be a UrL object not a UrI object
IMembershipCondition membership = new UrlMembershipCondition(BindUriHelper.UriToString(srcUri));
CodeGroup group = (srcUri.IsFile) ?
(CodeGroup)new FileCodeGroup(membership, FileIOPermissionAccess.Read | FileIOPermissionAccess.PathDiscovery)
:(CodeGroup)new NetCodeGroup(membership);
PolicyStatement policy = group.Resolve(evidence);
if (!policy.PermissionSet.IsEmpty())
{
newPermSet = originalPermSet.Union(policy.PermissionSet);
}
}
return newPermSet;
}
///
/// Critical - because this accesses critical data AppDomain.CurrentDomain.SetupInformation.ActivationArguments.
/// Safe - because this does not expose that string.
///
[SecurityCritical, SecurityTreatAsSafe]
private bool GetBoolFromActivationData(int index)
{
bool flag = false; // default
if (AppDomain.CurrentDomain.SetupInformation.ActivationArguments != null &&
AppDomain.CurrentDomain.SetupInformation.ActivationArguments.ActivationData.Length > index)
{
if (AppDomain.CurrentDomain.SetupInformation.ActivationArguments.ActivationData[index] == true.ToString())
{
flag = true;
}
}
return flag;
}
///
/// Critical - because this accesses critical data AppDomain.CurrentDomain.SetupInformation.ActivationArguments.
/// Safe - because this does not expose that string.
///
[SecurityCritical, SecurityTreatAsSafe]
private Uri GetUriFromActivationData(int index)
{
Uri uri = null;
if (AppDomain.CurrentDomain.SetupInformation.ActivationArguments != null &&
AppDomain.CurrentDomain.SetupInformation.ActivationArguments.ActivationData.Length > index)
{
if (!string.IsNullOrEmpty(AppDomain.CurrentDomain.SetupInformation.ActivationArguments.ActivationData[index]))
{
uri = new UriBuilder(AppDomain.CurrentDomain.SetupInformation.ActivationArguments.ActivationData[index]).Uri;
}
}
return uri;
}
}
// This is the custom ApplicationActivator that will be returned by
// the PresentationAppDomainManager.ApplicationActivator property.
// CreateInstance will be called twice: the first time to create
// the new AppDomain, and the second time to create the app inside
// of the new AppDomain.
internal class PresentationApplicationActivator : System.Runtime.Hosting.ApplicationActivator
{
///
/// Critical - because this does an elevation to get the ID string.
/// Safe - because this does not expose that string.
///
[SecurityCritical, SecurityTreatAsSafe]
public override ObjectHandle CreateInstance(ActivationContext actCtx)
{
if (EventTrace.IsEnabled(EventTrace.Flags.performance, EventTrace.Level.verbose))
{
EventTrace.EventProvider.TraceEvent(
EventTrace.Level.verbose, EventTrace.GuidFromId(EventTraceGuidId.HOSTINGGUID), (byte)EventTrace.HostingEvent.ApplicationActivatorCreateInstanceStart,
PresentationAppDomainManager.ActivationUri != null ? PresentationAppDomainManager.ActivationUri.ToString() : string.Empty);
}
ObjectHandle oh;
if (PresentationAppDomainManager.ActivationUri != null)
{
oh = base.CreateInstance(
actCtx,
new string[] {
BindUriHelper.UriToString(PresentationAppDomainManager.ActivationUri),
PresentationAppDomainManager.IsDebug.ToString(),
(PresentationAppDomainManager.DebugSecurityZoneURL == null?
string.Empty
: PresentationAppDomainManager.DebugSecurityZoneURL.ToString())});
}
else
{
oh = base.CreateInstance(actCtx);
}
bool returnAppDomain = false;
try
{
new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Assert(); // BlessedAssert:
if (AppDomain.CurrentDomain.ActivationContext != null &&
AppDomain.CurrentDomain.ActivationContext.Identity.ToString().Equals(actCtx.Identity.ToString()))
{
returnAppDomain = true;
}
}
finally
{
CodeAccessPermission.RevertAssert();
}
if (EventTrace.IsEnabled(EventTrace.Flags.performance, EventTrace.Level.verbose))
{
EventTrace.EventProvider.TraceEvent(EventTrace.Level.verbose, EventTrace.GuidFromId(EventTraceGuidId.HOSTINGGUID), (byte)EventTrace.HostingEvent.ApplicationActivatorCreateInstanceEnd);
}
if (returnAppDomain)
{
// this is the server domain
return new ObjectHandle(AppDomain.CurrentDomain);
}
else
{
return oh;
}
}
}
// This is a custom AppDomainManager class we're using. We need to set the
// assembly name and class name in the environment for CLR to use it. We
// need to use this to detect new AppDomain creation.
internal class PresentationAppDomainManager : AppDomainManager
{
///
/// Critical: Initializes Critical data
///
[SecurityCritical, SecurityTreatAsSafe]
static PresentationAppDomainManager()
{
if (EventTrace.IsEnabled(EventTrace.Flags.performance, EventTrace.Level.verbose))
{
EventTrace.EventProvider.TraceEvent(EventTrace.Level.verbose, EventTrace.GuidFromId(EventTraceGuidId.HOSTINGGUID), (byte)EventTrace.HostingEvent.AppDomainManagerCctor);
}
}
///
/// Critical: Base class has link demnd and inheritance demand
///
[SecurityCritical]
public PresentationAppDomainManager()
{
}
public override ApplicationActivator ApplicationActivator
{
get
{
if (_appActivator == null)
_appActivator = new PresentationApplicationActivator();
return _appActivator;
}
}
///
/// Critical: This hooks up the assembly filter which we want to prevent arbitrary code from doing.
///
[SecurityCritical]
public override void InitializeNewDomain(AppDomainSetup appDomainInfo)
{
//Hookup the assembly load event
_assemblyFilter = new AssemblyFilter();
AppDomain.CurrentDomain.AssemblyLoad += new AssemblyLoadEventHandler(_assemblyFilter.FilterCallback);
}
///
/// Critical - get: Discloses a HostSecurityManager object
///
public override HostSecurityManager HostSecurityManager
{
[SecurityCritical]
get
{
if (_hostsecuritymanager == null)
{
_hostsecuritymanager = new PresentationHostSecurityManager();
}
return _hostsecuritymanager;
}
}
// Creates ApplicationProxyInternal. Creating it from Default domain will
// cause a stack walk for ReflectionPermission which will fail for partial
// trust apps.
///
/// Critical: This calls the critical ApplicationProxyInternal ctor
///
[SecurityCritical]
internal ApplicationProxyInternal CreateApplicationProxyInternal()
{
return new ApplicationProxyInternal();
}
internal static AppDomain NewAppDomain
{
get { return _newAppDomain; }
set { _newAppDomain = value; }
}
internal static bool SaveAppDomain
{
get { return _saveAppDomain; }
set
{
_saveAppDomain = value;
// Allow garbage collection to happen.
_newAppDomain = null;
}
}
internal static Uri ActivationUri
{
get { return _activationUri; }
set { _activationUri = value; }
}
internal static Uri DebugSecurityZoneURL
{
get { return _debugSecurityZoneURL; }
set { _debugSecurityZoneURL = value; }
}
internal static bool IsDebug
{
get { return _isdebug; }
set { _isdebug = value; }
}
private static bool _isdebug = false;
private ApplicationActivator _appActivator = null;
///
/// It holds a HostSecurityManager object, which is critical and can interfere with the permissions that are assigned to an AppDomain.
///
[SecurityCritical]
private HostSecurityManager _hostsecuritymanager = null;
private static AppDomain _newAppDomain;
private static bool _saveAppDomain;
private static Uri _activationUri;
private static Uri _debugSecurityZoneURL;
///
/// Critical: This should not be exposed since it can be used to bring down process
///
[SecurityCritical]
private AssemblyFilter _assemblyFilter;
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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