ApplicationTrust.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / clr / src / BCL / System / Security / Policy / ApplicationTrust.cs / 5 / ApplicationTrust.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 

// 
// ApplicationTrust.cs 
//
// This class encapsulates security decisions about an application. 
//

namespace System.Security.Policy {
    using System.Collections; 
    using System.Deployment.Internal.Isolation;
    using System.Deployment.Internal.Isolation.Manifest; 
    using System.Globalization; 
    using System.IO;
    using System.Runtime.InteropServices; 
    using System.Runtime.Serialization.Formatters.Binary;
    using System.Security.Permissions;
    using System.Security.Util;
    using System.Text; 
    using System.Threading;
 
    [System.Runtime.InteropServices.ComVisible(true)] 
    public enum ApplicationVersionMatch {
        MatchExactVersion, 
        MatchAllVersions
    }

    [System.Runtime.InteropServices.ComVisible(true)] 
    [Serializable]
    public sealed class ApplicationTrust : ISecurityEncodable { 
        private ApplicationIdentity m_appId; 
        private bool m_appTrustedToRun;
        private bool m_persist; 
        private object m_extraInfo;
        private SecurityElement m_elExtraInfo;
        private PolicyStatement m_psDefaultGrant;
        private StrongName[] m_fullTrustAssemblies; 

        public ApplicationTrust (ApplicationIdentity applicationIdentity) : this () { 
            ApplicationIdentity = applicationIdentity; 
        }
 
        public ApplicationTrust () : this (new PermissionSet(PermissionState.None)) {}
        internal ApplicationTrust (PermissionSet defaultGrantSet) : this (defaultGrantSet, null) {}
        internal ApplicationTrust (PermissionSet defaultGrantSet, StrongName[] fullTrustAssemblies) {
            DefaultGrantSet = new PolicyStatement(defaultGrantSet); 
            FullTrustAssemblies = fullTrustAssemblies;
        } 
 
        public ApplicationIdentity ApplicationIdentity {
            get { 
                return m_appId;
            }
            set {
                if (value == null) 
                    throw new ArgumentNullException(Environment.GetResourceString("Argument_InvalidAppId"));
                m_appId = value; 
            } 
        }
 
        public PolicyStatement DefaultGrantSet {
            get {
                if (m_psDefaultGrant == null)
                    return new PolicyStatement(new PermissionSet(PermissionState.None)); 
                return m_psDefaultGrant;
            } 
            set { 
                if (value == null)
                    m_psDefaultGrant = null; 
                else
                    m_psDefaultGrant = value;
            }
        } 

        internal StrongName[] FullTrustAssemblies { 
            get { 
                return m_fullTrustAssemblies;
            } 
            set {
                m_fullTrustAssemblies = value;
            }
        } 

        public bool IsApplicationTrustedToRun { 
            get { 
                return m_appTrustedToRun;
            } 
            set {
                m_appTrustedToRun = value;
            }
        } 

        public bool Persist { 
            get { 
                return m_persist;
            } 
            set {
                m_persist = value;
            }
        } 

        public object ExtraInfo { 
            get { 
                if (m_elExtraInfo != null) {
                    m_extraInfo = ObjectFromXml(m_elExtraInfo); 
                    m_elExtraInfo = null;
                }
                return m_extraInfo;
            } 
            set {
                m_elExtraInfo = null; 
                m_extraInfo = value; 
            }
        } 

        public SecurityElement ToXml () {
            SecurityElement elRoot = new SecurityElement("ApplicationTrust");
            elRoot.AddAttribute("version", "1"); 

            if (m_appId != null) 
                elRoot.AddAttribute("FullName", SecurityElement.Escape(m_appId.FullName)); 
            if (m_appTrustedToRun)
                elRoot.AddAttribute("TrustedToRun", "true"); 
            if (m_persist)
                elRoot.AddAttribute("Persist", "true");

            if (m_psDefaultGrant != null) { 
                SecurityElement elDefaultGrant = new SecurityElement("DefaultGrant");
                elDefaultGrant.AddChild(m_psDefaultGrant.ToXml()); 
                elRoot.AddChild(elDefaultGrant); 
            }
            if (m_fullTrustAssemblies != null) { 
                SecurityElement elFullTrustAssemblies = new SecurityElement("FullTrustAssemblies");
                for (int index = 0; index < m_fullTrustAssemblies.Length; index++) {
                    if (m_fullTrustAssemblies[index] != null)
                        elFullTrustAssemblies.AddChild(m_fullTrustAssemblies[index].ToXml()); 
                }
                elRoot.AddChild(elFullTrustAssemblies); 
            } 
            if (ExtraInfo != null)
                elRoot.AddChild(ObjectToXml("ExtraInfo", ExtraInfo)); 

            return elRoot;
        }
 
        public void FromXml (SecurityElement element) {
            if (element == null) 
                throw new ArgumentNullException("element"); 
            if (String.Compare(element.Tag, "ApplicationTrust", StringComparison.Ordinal) != 0)
                throw new ArgumentException(Environment.GetResourceString("Argument_InvalidXML")); 

            m_psDefaultGrant = null;
            m_fullTrustAssemblies = null;
            m_appTrustedToRun = false; 

            string isAppTrustedToRun = element.Attribute("TrustedToRun"); 
            if (isAppTrustedToRun != null && String.Compare(isAppTrustedToRun, "true", StringComparison.Ordinal) == 0) 
                m_appTrustedToRun = true;
            string persist = element.Attribute("Persist"); 
            if (persist != null && String.Compare(persist, "true", StringComparison.Ordinal) == 0)
                m_persist = true;

            string fullName = element.Attribute("FullName"); 
            if (fullName != null && fullName.Length > 0)
                m_appId = new ApplicationIdentity(fullName); 
 
            SecurityElement elDefaultGrant = element.SearchForChildByTag("DefaultGrant");
            if (elDefaultGrant != null) { 
                SecurityElement elDefaultGrantPS = elDefaultGrant.SearchForChildByTag("PolicyStatement");
                if (elDefaultGrantPS != null) {
                    PolicyStatement ps = new PolicyStatement(null);
                    ps.FromXml(elDefaultGrantPS); 
                    m_psDefaultGrant = ps;
                } 
            } 

            SecurityElement elFullTrustAssemblies = element.SearchForChildByTag("FullTrustAssemblies"); 
            if (elFullTrustAssemblies != null && elFullTrustAssemblies.InternalChildren != null) {
                m_fullTrustAssemblies = new StrongName[elFullTrustAssemblies.Children.Count];
                IEnumerator enumerator = elFullTrustAssemblies.Children.GetEnumerator();
                int index = 0; 
                while (enumerator.MoveNext()) {
                    m_fullTrustAssemblies[index] = new StrongName(); 
                    m_fullTrustAssemblies[index].FromXml(enumerator.Current as SecurityElement); 
                    index++;
                } 
            }

            m_elExtraInfo = element.SearchForChildByTag("ExtraInfo");
        } 

        private static SecurityElement ObjectToXml (string tag, Object obj) { 
            BCLDebug.Assert(obj != null, "You need to pass in an object"); 

            ISecurityEncodable encodableObj = obj as ISecurityEncodable; 

            SecurityElement elObject;
            if (encodableObj != null) {
                elObject = encodableObj.ToXml(); 
                if (!elObject.Tag.Equals(tag))
                    throw new ArgumentException(Environment.GetResourceString("Argument_InvalidXML")); 
            } 

            MemoryStream stream = new MemoryStream(); 
            BinaryFormatter formatter = new BinaryFormatter();
            formatter.Serialize(stream, obj);
            byte[] array = stream.ToArray();
 
            elObject = new SecurityElement(tag);
            elObject.AddAttribute("Data", Hex.EncodeHexString(array)); 
            return elObject; 
        }
 

        private static Object ObjectFromXml (SecurityElement elObject) {
            BCLDebug.Assert(elObject != null, "You need to pass in a security element");
 
            if (elObject.Attribute("class") != null) {
                ISecurityEncodable encodableObj = XMLUtil.CreateCodeGroup(elObject) as ISecurityEncodable; 
                if (encodableObj != null) { 
                    encodableObj.FromXml(elObject);
                    return encodableObj; 
                }
            }

            string objectData = elObject.Attribute("Data"); 
            MemoryStream stream = new MemoryStream(Hex.DecodeHexString(objectData));
            BinaryFormatter formatter = new BinaryFormatter(); 
            return formatter.Deserialize(stream); 
        }
    } 

    [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.ControlPolicy)]
    [System.Runtime.InteropServices.ComVisible(true)]
    public sealed class ApplicationTrustCollection : ICollection { 
        private const string ApplicationTrustProperty = "ApplicationTrust";
        private const string InstallerIdentifier = "{60051b8f-4f12-400a-8e50-dd05ebd438d1}"; 
        private static Guid ClrPropertySet = new Guid("c989bb7a-8385-4715-98cf-a741a8edb823"); 

        // The CLR specific constant install reference. 
        private static object s_installReference = null;
        private static StoreApplicationReference InstallReference {
            get {
                if (s_installReference == null) { 
                    Interlocked.CompareExchange(ref s_installReference,
                                                new StoreApplicationReference( 
                                                    IsolationInterop.GUID_SXS_INSTALL_REFERENCE_SCHEME_OPAQUESTRING, 
                                                    InstallerIdentifier,
                                                    null), 
                                                null);
                }
                return (StoreApplicationReference) s_installReference;
            } 
        }
 
        private readonly object m_syncRoot = new object(); 

        private object m_appTrusts = null; 
        private ArrayList AppTrusts {
            get {
                if (m_appTrusts == null) {
                    ArrayList appTrusts = new ArrayList(); 
                    if (m_storeBounded) {
                        RefreshStorePointer(); 
                        // enumerate the user store and populate the collection 
                        StoreDeploymentMetadataEnumeration deplEnum = m_pStore.EnumInstallerDeployments(IsolationInterop.GUID_SXS_INSTALL_REFERENCE_SCHEME_OPAQUESTRING, InstallerIdentifier, ApplicationTrustProperty, null);
                        foreach (IDefinitionAppId defAppId in deplEnum) { 
                            StoreDeploymentMetadataPropertyEnumeration metadataEnum = m_pStore.EnumInstallerDeploymentProperties(IsolationInterop.GUID_SXS_INSTALL_REFERENCE_SCHEME_OPAQUESTRING, InstallerIdentifier, ApplicationTrustProperty, defAppId);
                            foreach (StoreOperationMetadataProperty appTrustProperty in metadataEnum) {
                                string appTrustXml = appTrustProperty.Value;
                                if (appTrustXml != null && appTrustXml.Length > 0) { 
                                    SecurityElement seTrust = SecurityElement.FromString(appTrustXml);
                                    ApplicationTrust appTrust = new ApplicationTrust(); 
                                    appTrust.FromXml(seTrust); 
                                    appTrusts.Add(appTrust);
                                } 
                            }
                        }
                    }
                    Interlocked.CompareExchange(ref m_appTrusts, appTrusts, null); 
                }
                return m_appTrusts as ArrayList; 
            } 
        }
 
        private bool m_storeBounded = false;
        private Store m_pStore = null; // Component store interface pointer.

        // Only internal constructors are exposed. 
        internal ApplicationTrustCollection () : this(false) {}
        internal ApplicationTrustCollection (bool storeBounded) { 
            m_storeBounded = storeBounded; 
        }
 
        private void RefreshStorePointer () {
            // Refresh store pointer.
            if (m_pStore != null)
                Marshal.ReleaseComObject(m_pStore.InternalStore); 
            m_pStore = IsolationInterop.GetUserStore();
        } 
 
        public int Count {
            get { 
                return AppTrusts.Count;
            }
        }
 
        public ApplicationTrust this[int index] {
            get { 
                return AppTrusts[index] as ApplicationTrust; 
            }
        } 

        public ApplicationTrust this[string appFullName] {
            get {
                ApplicationIdentity identity = new ApplicationIdentity(appFullName); 
                ApplicationTrustCollection appTrusts = Find(identity, ApplicationVersionMatch.MatchExactVersion);
                if (appTrusts.Count > 0) 
                    return appTrusts[0]; 
                return null;
            } 
        }

        private void CommitApplicationTrust(ApplicationIdentity applicationIdentity, string trustXml) {
            StoreOperationMetadataProperty[] properties = new StoreOperationMetadataProperty[] { 
                    new StoreOperationMetadataProperty(ClrPropertySet, ApplicationTrustProperty, trustXml)
                }; 
 
            IEnumDefinitionIdentity idenum = applicationIdentity.Identity.EnumAppPath();
            IDefinitionIdentity[] asbId = new IDefinitionIdentity[1]; 
            IDefinitionIdentity deplId = null;
            if (idenum.Next(1, asbId) == 1)
                deplId = asbId[0];
 
            IDefinitionAppId defAppId = IsolationInterop.AppIdAuthority.CreateDefinition();
            defAppId.SetAppPath(1, new IDefinitionIdentity[] {deplId}); 
            defAppId.put_Codebase(applicationIdentity.CodeBase); 

            using (StoreTransaction storeTxn = new StoreTransaction()) { 
                storeTxn.Add(new StoreOperationSetDeploymentMetadata(defAppId, InstallReference, properties));
                RefreshStorePointer();
                m_pStore.Transact(storeTxn.Operations);
            } 

            m_appTrusts = null; // reset the app trusts in the collection. 
        } 

        public int Add (ApplicationTrust trust) { 
            if (trust == null)
                throw new ArgumentNullException("trust");
            if (trust.ApplicationIdentity == null)
                throw new ArgumentException(Environment.GetResourceString("Argument_ApplicationTrustShouldHaveIdentity")); 

            // Add the trust decision of the application to the fusion store. 
            if (m_storeBounded) { 
                CommitApplicationTrust(trust.ApplicationIdentity, trust.ToXml().ToString());
                return -1; 
            } else {
                return AppTrusts.Add(trust);
            }
        } 

        public void AddRange (ApplicationTrust[] trusts) { 
            if (trusts == null) 
                throw new ArgumentNullException("trusts");
 
            int i=0;
            try {
                for (; i 
        IEnumerator IEnumerable.GetEnumerator() { 
            return new ApplicationTrustEnumerator(this);
        } 

        /// 
        void ICollection.CopyTo(Array array, int index) {
            if (array == null) 
                throw new ArgumentNullException("array");
            if (array.Rank != 1) 
                throw new ArgumentException(Environment.GetResourceString("Arg_RankMultiDimNotSupported")); 
            if (index < 0 || index >= array.Length)
                throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_Index")); 
            if (array.Length - index < this.Count)
                throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen"));

            for (int i=0; i < this.Count; i++) { 
                array.SetValue(this[i], index++);
            } 
        } 

        public void CopyTo (ApplicationTrust[] array, int index) { 
            ((ICollection)this).CopyTo(array, index);
        }

        public bool IsSynchronized { 
            get {
                return false; 
            } 
        }
 
        public object SyncRoot {
            get {
                return this;
            } 
        }
    } 
 
    [System.Runtime.InteropServices.ComVisible(true)]
    public sealed class ApplicationTrustEnumerator : IEnumerator { 
        private ApplicationTrustCollection m_trusts;
        private int m_current;

        private ApplicationTrustEnumerator() {} 
        internal ApplicationTrustEnumerator(ApplicationTrustCollection trusts) {
            m_trusts = trusts; 
            m_current = -1; 
        }
 
        public ApplicationTrust Current {
            get {
                return m_trusts[m_current];
            } 
        }
 
        ///  
        object IEnumerator.Current {
            get { 
                return (object) m_trusts[m_current];
            }
        }
 
        public bool MoveNext() {
            if (m_current == ((int) m_trusts.Count - 1)) 
                return false; 
            m_current++;
            return true; 
        }

        public void Reset() {
            m_current = -1; 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 

// 
// ApplicationTrust.cs 
//
// This class encapsulates security decisions about an application. 
//

namespace System.Security.Policy {
    using System.Collections; 
    using System.Deployment.Internal.Isolation;
    using System.Deployment.Internal.Isolation.Manifest; 
    using System.Globalization; 
    using System.IO;
    using System.Runtime.InteropServices; 
    using System.Runtime.Serialization.Formatters.Binary;
    using System.Security.Permissions;
    using System.Security.Util;
    using System.Text; 
    using System.Threading;
 
    [System.Runtime.InteropServices.ComVisible(true)] 
    public enum ApplicationVersionMatch {
        MatchExactVersion, 
        MatchAllVersions
    }

    [System.Runtime.InteropServices.ComVisible(true)] 
    [Serializable]
    public sealed class ApplicationTrust : ISecurityEncodable { 
        private ApplicationIdentity m_appId; 
        private bool m_appTrustedToRun;
        private bool m_persist; 
        private object m_extraInfo;
        private SecurityElement m_elExtraInfo;
        private PolicyStatement m_psDefaultGrant;
        private StrongName[] m_fullTrustAssemblies; 

        public ApplicationTrust (ApplicationIdentity applicationIdentity) : this () { 
            ApplicationIdentity = applicationIdentity; 
        }
 
        public ApplicationTrust () : this (new PermissionSet(PermissionState.None)) {}
        internal ApplicationTrust (PermissionSet defaultGrantSet) : this (defaultGrantSet, null) {}
        internal ApplicationTrust (PermissionSet defaultGrantSet, StrongName[] fullTrustAssemblies) {
            DefaultGrantSet = new PolicyStatement(defaultGrantSet); 
            FullTrustAssemblies = fullTrustAssemblies;
        } 
 
        public ApplicationIdentity ApplicationIdentity {
            get { 
                return m_appId;
            }
            set {
                if (value == null) 
                    throw new ArgumentNullException(Environment.GetResourceString("Argument_InvalidAppId"));
                m_appId = value; 
            } 
        }
 
        public PolicyStatement DefaultGrantSet {
            get {
                if (m_psDefaultGrant == null)
                    return new PolicyStatement(new PermissionSet(PermissionState.None)); 
                return m_psDefaultGrant;
            } 
            set { 
                if (value == null)
                    m_psDefaultGrant = null; 
                else
                    m_psDefaultGrant = value;
            }
        } 

        internal StrongName[] FullTrustAssemblies { 
            get { 
                return m_fullTrustAssemblies;
            } 
            set {
                m_fullTrustAssemblies = value;
            }
        } 

        public bool IsApplicationTrustedToRun { 
            get { 
                return m_appTrustedToRun;
            } 
            set {
                m_appTrustedToRun = value;
            }
        } 

        public bool Persist { 
            get { 
                return m_persist;
            } 
            set {
                m_persist = value;
            }
        } 

        public object ExtraInfo { 
            get { 
                if (m_elExtraInfo != null) {
                    m_extraInfo = ObjectFromXml(m_elExtraInfo); 
                    m_elExtraInfo = null;
                }
                return m_extraInfo;
            } 
            set {
                m_elExtraInfo = null; 
                m_extraInfo = value; 
            }
        } 

        public SecurityElement ToXml () {
            SecurityElement elRoot = new SecurityElement("ApplicationTrust");
            elRoot.AddAttribute("version", "1"); 

            if (m_appId != null) 
                elRoot.AddAttribute("FullName", SecurityElement.Escape(m_appId.FullName)); 
            if (m_appTrustedToRun)
                elRoot.AddAttribute("TrustedToRun", "true"); 
            if (m_persist)
                elRoot.AddAttribute("Persist", "true");

            if (m_psDefaultGrant != null) { 
                SecurityElement elDefaultGrant = new SecurityElement("DefaultGrant");
                elDefaultGrant.AddChild(m_psDefaultGrant.ToXml()); 
                elRoot.AddChild(elDefaultGrant); 
            }
            if (m_fullTrustAssemblies != null) { 
                SecurityElement elFullTrustAssemblies = new SecurityElement("FullTrustAssemblies");
                for (int index = 0; index < m_fullTrustAssemblies.Length; index++) {
                    if (m_fullTrustAssemblies[index] != null)
                        elFullTrustAssemblies.AddChild(m_fullTrustAssemblies[index].ToXml()); 
                }
                elRoot.AddChild(elFullTrustAssemblies); 
            } 
            if (ExtraInfo != null)
                elRoot.AddChild(ObjectToXml("ExtraInfo", ExtraInfo)); 

            return elRoot;
        }
 
        public void FromXml (SecurityElement element) {
            if (element == null) 
                throw new ArgumentNullException("element"); 
            if (String.Compare(element.Tag, "ApplicationTrust", StringComparison.Ordinal) != 0)
                throw new ArgumentException(Environment.GetResourceString("Argument_InvalidXML")); 

            m_psDefaultGrant = null;
            m_fullTrustAssemblies = null;
            m_appTrustedToRun = false; 

            string isAppTrustedToRun = element.Attribute("TrustedToRun"); 
            if (isAppTrustedToRun != null && String.Compare(isAppTrustedToRun, "true", StringComparison.Ordinal) == 0) 
                m_appTrustedToRun = true;
            string persist = element.Attribute("Persist"); 
            if (persist != null && String.Compare(persist, "true", StringComparison.Ordinal) == 0)
                m_persist = true;

            string fullName = element.Attribute("FullName"); 
            if (fullName != null && fullName.Length > 0)
                m_appId = new ApplicationIdentity(fullName); 
 
            SecurityElement elDefaultGrant = element.SearchForChildByTag("DefaultGrant");
            if (elDefaultGrant != null) { 
                SecurityElement elDefaultGrantPS = elDefaultGrant.SearchForChildByTag("PolicyStatement");
                if (elDefaultGrantPS != null) {
                    PolicyStatement ps = new PolicyStatement(null);
                    ps.FromXml(elDefaultGrantPS); 
                    m_psDefaultGrant = ps;
                } 
            } 

            SecurityElement elFullTrustAssemblies = element.SearchForChildByTag("FullTrustAssemblies"); 
            if (elFullTrustAssemblies != null && elFullTrustAssemblies.InternalChildren != null) {
                m_fullTrustAssemblies = new StrongName[elFullTrustAssemblies.Children.Count];
                IEnumerator enumerator = elFullTrustAssemblies.Children.GetEnumerator();
                int index = 0; 
                while (enumerator.MoveNext()) {
                    m_fullTrustAssemblies[index] = new StrongName(); 
                    m_fullTrustAssemblies[index].FromXml(enumerator.Current as SecurityElement); 
                    index++;
                } 
            }

            m_elExtraInfo = element.SearchForChildByTag("ExtraInfo");
        } 

        private static SecurityElement ObjectToXml (string tag, Object obj) { 
            BCLDebug.Assert(obj != null, "You need to pass in an object"); 

            ISecurityEncodable encodableObj = obj as ISecurityEncodable; 

            SecurityElement elObject;
            if (encodableObj != null) {
                elObject = encodableObj.ToXml(); 
                if (!elObject.Tag.Equals(tag))
                    throw new ArgumentException(Environment.GetResourceString("Argument_InvalidXML")); 
            } 

            MemoryStream stream = new MemoryStream(); 
            BinaryFormatter formatter = new BinaryFormatter();
            formatter.Serialize(stream, obj);
            byte[] array = stream.ToArray();
 
            elObject = new SecurityElement(tag);
            elObject.AddAttribute("Data", Hex.EncodeHexString(array)); 
            return elObject; 
        }
 

        private static Object ObjectFromXml (SecurityElement elObject) {
            BCLDebug.Assert(elObject != null, "You need to pass in a security element");
 
            if (elObject.Attribute("class") != null) {
                ISecurityEncodable encodableObj = XMLUtil.CreateCodeGroup(elObject) as ISecurityEncodable; 
                if (encodableObj != null) { 
                    encodableObj.FromXml(elObject);
                    return encodableObj; 
                }
            }

            string objectData = elObject.Attribute("Data"); 
            MemoryStream stream = new MemoryStream(Hex.DecodeHexString(objectData));
            BinaryFormatter formatter = new BinaryFormatter(); 
            return formatter.Deserialize(stream); 
        }
    } 

    [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.ControlPolicy)]
    [System.Runtime.InteropServices.ComVisible(true)]
    public sealed class ApplicationTrustCollection : ICollection { 
        private const string ApplicationTrustProperty = "ApplicationTrust";
        private const string InstallerIdentifier = "{60051b8f-4f12-400a-8e50-dd05ebd438d1}"; 
        private static Guid ClrPropertySet = new Guid("c989bb7a-8385-4715-98cf-a741a8edb823"); 

        // The CLR specific constant install reference. 
        private static object s_installReference = null;
        private static StoreApplicationReference InstallReference {
            get {
                if (s_installReference == null) { 
                    Interlocked.CompareExchange(ref s_installReference,
                                                new StoreApplicationReference( 
                                                    IsolationInterop.GUID_SXS_INSTALL_REFERENCE_SCHEME_OPAQUESTRING, 
                                                    InstallerIdentifier,
                                                    null), 
                                                null);
                }
                return (StoreApplicationReference) s_installReference;
            } 
        }
 
        private readonly object m_syncRoot = new object(); 

        private object m_appTrusts = null; 
        private ArrayList AppTrusts {
            get {
                if (m_appTrusts == null) {
                    ArrayList appTrusts = new ArrayList(); 
                    if (m_storeBounded) {
                        RefreshStorePointer(); 
                        // enumerate the user store and populate the collection 
                        StoreDeploymentMetadataEnumeration deplEnum = m_pStore.EnumInstallerDeployments(IsolationInterop.GUID_SXS_INSTALL_REFERENCE_SCHEME_OPAQUESTRING, InstallerIdentifier, ApplicationTrustProperty, null);
                        foreach (IDefinitionAppId defAppId in deplEnum) { 
                            StoreDeploymentMetadataPropertyEnumeration metadataEnum = m_pStore.EnumInstallerDeploymentProperties(IsolationInterop.GUID_SXS_INSTALL_REFERENCE_SCHEME_OPAQUESTRING, InstallerIdentifier, ApplicationTrustProperty, defAppId);
                            foreach (StoreOperationMetadataProperty appTrustProperty in metadataEnum) {
                                string appTrustXml = appTrustProperty.Value;
                                if (appTrustXml != null && appTrustXml.Length > 0) { 
                                    SecurityElement seTrust = SecurityElement.FromString(appTrustXml);
                                    ApplicationTrust appTrust = new ApplicationTrust(); 
                                    appTrust.FromXml(seTrust); 
                                    appTrusts.Add(appTrust);
                                } 
                            }
                        }
                    }
                    Interlocked.CompareExchange(ref m_appTrusts, appTrusts, null); 
                }
                return m_appTrusts as ArrayList; 
            } 
        }
 
        private bool m_storeBounded = false;
        private Store m_pStore = null; // Component store interface pointer.

        // Only internal constructors are exposed. 
        internal ApplicationTrustCollection () : this(false) {}
        internal ApplicationTrustCollection (bool storeBounded) { 
            m_storeBounded = storeBounded; 
        }
 
        private void RefreshStorePointer () {
            // Refresh store pointer.
            if (m_pStore != null)
                Marshal.ReleaseComObject(m_pStore.InternalStore); 
            m_pStore = IsolationInterop.GetUserStore();
        } 
 
        public int Count {
            get { 
                return AppTrusts.Count;
            }
        }
 
        public ApplicationTrust this[int index] {
            get { 
                return AppTrusts[index] as ApplicationTrust; 
            }
        } 

        public ApplicationTrust this[string appFullName] {
            get {
                ApplicationIdentity identity = new ApplicationIdentity(appFullName); 
                ApplicationTrustCollection appTrusts = Find(identity, ApplicationVersionMatch.MatchExactVersion);
                if (appTrusts.Count > 0) 
                    return appTrusts[0]; 
                return null;
            } 
        }

        private void CommitApplicationTrust(ApplicationIdentity applicationIdentity, string trustXml) {
            StoreOperationMetadataProperty[] properties = new StoreOperationMetadataProperty[] { 
                    new StoreOperationMetadataProperty(ClrPropertySet, ApplicationTrustProperty, trustXml)
                }; 
 
            IEnumDefinitionIdentity idenum = applicationIdentity.Identity.EnumAppPath();
            IDefinitionIdentity[] asbId = new IDefinitionIdentity[1]; 
            IDefinitionIdentity deplId = null;
            if (idenum.Next(1, asbId) == 1)
                deplId = asbId[0];
 
            IDefinitionAppId defAppId = IsolationInterop.AppIdAuthority.CreateDefinition();
            defAppId.SetAppPath(1, new IDefinitionIdentity[] {deplId}); 
            defAppId.put_Codebase(applicationIdentity.CodeBase); 

            using (StoreTransaction storeTxn = new StoreTransaction()) { 
                storeTxn.Add(new StoreOperationSetDeploymentMetadata(defAppId, InstallReference, properties));
                RefreshStorePointer();
                m_pStore.Transact(storeTxn.Operations);
            } 

            m_appTrusts = null; // reset the app trusts in the collection. 
        } 

        public int Add (ApplicationTrust trust) { 
            if (trust == null)
                throw new ArgumentNullException("trust");
            if (trust.ApplicationIdentity == null)
                throw new ArgumentException(Environment.GetResourceString("Argument_ApplicationTrustShouldHaveIdentity")); 

            // Add the trust decision of the application to the fusion store. 
            if (m_storeBounded) { 
                CommitApplicationTrust(trust.ApplicationIdentity, trust.ToXml().ToString());
                return -1; 
            } else {
                return AppTrusts.Add(trust);
            }
        } 

        public void AddRange (ApplicationTrust[] trusts) { 
            if (trusts == null) 
                throw new ArgumentNullException("trusts");
 
            int i=0;
            try {
                for (; i 
        IEnumerator IEnumerable.GetEnumerator() { 
            return new ApplicationTrustEnumerator(this);
        } 

        /// 
        void ICollection.CopyTo(Array array, int index) {
            if (array == null) 
                throw new ArgumentNullException("array");
            if (array.Rank != 1) 
                throw new ArgumentException(Environment.GetResourceString("Arg_RankMultiDimNotSupported")); 
            if (index < 0 || index >= array.Length)
                throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_Index")); 
            if (array.Length - index < this.Count)
                throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen"));

            for (int i=0; i < this.Count; i++) { 
                array.SetValue(this[i], index++);
            } 
        } 

        public void CopyTo (ApplicationTrust[] array, int index) { 
            ((ICollection)this).CopyTo(array, index);
        }

        public bool IsSynchronized { 
            get {
                return false; 
            } 
        }
 
        public object SyncRoot {
            get {
                return this;
            } 
        }
    } 
 
    [System.Runtime.InteropServices.ComVisible(true)]
    public sealed class ApplicationTrustEnumerator : IEnumerator { 
        private ApplicationTrustCollection m_trusts;
        private int m_current;

        private ApplicationTrustEnumerator() {} 
        internal ApplicationTrustEnumerator(ApplicationTrustCollection trusts) {
            m_trusts = trusts; 
            m_current = -1; 
        }
 
        public ApplicationTrust Current {
            get {
                return m_trusts[m_current];
            } 
        }
 
        ///  
        object IEnumerator.Current {
            get { 
                return (object) m_trusts[m_current];
            }
        }
 
        public bool MoveNext() {
            if (m_current == ((int) m_trusts.Count - 1)) 
                return false; 
            m_current++;
            return true; 
        }

        public void Reset() {
            m_current = -1; 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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