PeoplePickerWrapper.cs source code in C# .NET

                        
Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / TrustUi / MS / Internal / documents / PeoplePickerWrapper.cs / 1 / PeoplePickerWrapper.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: PeoplePickerWrapper provides a managed wrapper around 
//              the unmanaged ActiveDirectory ICommonQuery COM object.
// 
//
// History:
// 8/16/2005 - [....] created
// 
//---------------------------------------------------------------------------
 
using System; 
using System.Collections.Generic;
using System.DirectoryServices; 
using System.Globalization;
using System.Runtime.InteropServices;
using System.Runtime.InteropServices.ComTypes;
using System.Security;  // for SecurityCritical attributes 
using System.Security.Permissions;
using System.Windows.TrustUI; 
 
using MS.Internal.PresentationUI;
 
namespace MS.Internal.Documents
{

    /// 
 
    /// PeoplePickerWrapper provides a managed wrapper around
    /// the unmanaged ActiveDirectory ICommonQuery COM object 
    /// 
 
    internal partial class PeoplePickerWrapper
    { 
        //-----------------------------------------------------
        //
        //  Constructors
        // 
        //-----------------------------------------------------
        #region Constructors 
 
        /// 

        /// Constructs a new PeoplePickerWrapper object. 
        /// 
        internal PeoplePickerWrapper()
        {
 
        }
        #endregion Constructors 
 
        //------------------------------------------------------
        // 
        //  Internal Methods
        //
        //-----------------------------------------------------
        #region Internal Methods 
        /// 

        /// Invokes the "People Picker" dialog and returns a list of strings 
        /// representing the email address of the users and groups selected therein. 
        /// 
        ///     Critical:  - This method is the "public" (internal) entry point for invoking 
        ///                  the unmanaged ActiveDirectory directory service query dialog and
        ///                  thus calls several SecurityCritical methods.
        ///                - It also returns "critical" data - a list of e-mail addresses
        ///                  selected by the user. 
        ///                - Asserts for UIPermission to call ValidateHWnd.
        ///  
        /// 
 
        /// The parent window for this dialog.  If null, window will
        /// be shown non-modally. 
        [SecurityCritical]
        internal String[] Show(IntPtr hWndParent)
        {
            (new UIPermission(UIPermissionWindow.AllWindows)) 
                .Assert(); // BlessedAssert
            try 
            { 
                ValidateHWnd(hWndParent);
            } 
            finally
            {
                UIPermission.RevertAssert();
            } 

            IDataObject data = OpenQueryWindow(hWndParent); 
 
            //If the data returned from OpenQueryWindow is null,
            //it means no data was entered in the dialog so we will 
            //return null.  Otherwise we need to extract the data
            //from the returned IDataObject object.
            if (data != null)
            { 
                //Get a MemoryStream that contains the data contained in the
                //IDataObject (which is a raw form of a DsObjects struct). 
                System.IO.MemoryStream dsObjectStream = null; 
                System.Windows.DataObject dataObject;
 
                //We need UIPermissionClipboard.AllClipboard and UnmanagedCode permissions
                //to call the DataObject.ctor and DataObject.GetData() method:
                PermissionSet permissions = new PermissionSet(PermissionState.None);
                permissions.AddPermission(new UIPermission(UIPermissionClipboard.AllClipboard)); 
                permissions.AddPermission(new SecurityPermission(SecurityPermissionFlag.UnmanagedCode));
 
                //Assert these permissions 
                permissions.Assert(); //BlessedAssert
 
                try
                {
                   dataObject = new System.Windows.DataObject(data);
                   dsObjectStream = 
                       dataObject.GetData(
                            UnsafeNativeMethods.CFSTR_DSOBJECTNAMES) as System.IO.MemoryStream; 
                } 
                finally
                { 
                   PermissionSet.RevertAssert();
                }

                //Extract the data from that memory stream.  These will come back as 
                //ActiveDirectory paths in the form 'LDAP://CN=...'
 
                String[] ldapPaths = new String[0]; 

                //Get a wrapper for the DsObjectNames object our pointer points to. 
                DsObjectNamesWrapper dsObjects = new DsObjectNamesWrapper(dsObjectStream);

                try
                { 
                    //Get the names from the DsObjectNamesWrapper (these are AD paths)
                    ldapPaths = dsObjects.Names; 
                } 
                finally
                { 
                    dsObjects.Dispose();
                    dsObjectStream.Close();
                }
 
                //Get a set of e-mail addresses from the paths using AD and return them.
                return GetEmailAddressesFromPaths(ldapPaths); 
            } 
            else
            { 
                return new String[0];
            }
        }
 
        #endregion Internal Methods
 
        //------------------------------------------------------ 
        //
        //  Private Methods 
        //
        //------------------------------------------------------

        #region Private Methods 
        /// 

        /// Instantiates an ICommonQuery COM object and invokes OpenQueryWindow on it 
        /// with the necessary parameters to bring up the "people picker" portion of 
        /// the dialog.
        /// 
 
        /// 
        ///     Critical:    We are creating an instance of an unmanaged COM object
        ///                  (ICommonQuery) in this method and invoking a method
        ///                  (OpenQueryWindow) on it and thus need to assert 
        ///                  UnmanagedCode permissions.
        /// 
        ///  
        /// 
        /// The HWND for the ICommonQuery.OpenQueryWindow call which 
        /// defines the parent of the dialog.
        [SecurityCritical]
        private IDataObject OpenQueryWindow(IntPtr hWndParent)
        { 

            UnsafeNativeMethods.ICommonQuery commonQueryInstance = null; 
 
            Type commonQueryType = Type.GetTypeFromCLSID(UnsafeNativeMethods.CLSID_CommonQuery);
            //Assert for UnmanagedCode permission, which is necessary for Activator.CreateInstance 
            new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Assert(); //BlessedAssert

            try
            { 
                //Get an instance of the ICommonQuery COM object.
                commonQueryInstance = Activator.CreateInstance(commonQueryType) 
                    as UnsafeNativeMethods.ICommonQuery; 
            }
            finally 
            {
                //Revert the assert
                SecurityPermission.RevertAssert();
            } 

            Invariant.Assert(commonQueryInstance != null, "Unable to create an instance of ICommonQuery."); 
 
            //Set up the QueryInitParams -- this is essentially empty as we require no special flags,
            //default usernames, passwords or server information for our purposes. 
            UnsafeNativeMethods.QueryInitParams queryInitParams =
                new UnsafeNativeMethods.QueryInitParams();
            queryInitParams.cbStruct =
                (uint)Marshal.SizeOf(typeof(UnsafeNativeMethods.QueryInitParams)); 
            queryInitParams.dwFlags = 0;
            queryInitParams.pDefaultScope = null; 
            queryInitParams.pDefaultSaveLocation = null; 
            queryInitParams.pUserName = null;
            queryInitParams.pPassword = null; 
            queryInitParams.pServer = null;

            //Allocate memory for our QueryInitParams structure that will be used in the
            //OpenQueryWindowParams structure. 
            IntPtr queryInitParamsPtr = Marshal.AllocCoTaskMem(Marshal.SizeOf(queryInitParams));
 
            //Now try to invoke the OpenQueryWindow method 
            uint hresult = UnsafeNativeMethods.E_FAIL;
            IDataObject data = null; 

            try
            {
                //Stuff the queryInitParams into a pointer (that we can assign to 
                //OpenQueryWindowParams.pHandlerParameters  below).
                Marshal.StructureToPtr(queryInitParams, queryInitParamsPtr, false /*fDeleteOld*/); 
 
                //Set up the OpenQueryWindowParams.
                //We require the default form with: 
                // - The specified "Find Users" default form
                // - "OK and Cancel" buttons shown
                // - Options enabled
                // - No "Find:" dropdown (for things other than users) 
                // - No menus
                // - Single item selection 
                UnsafeNativeMethods.OpenQueryWindowParams openQueryWindowParams = 
                    new UnsafeNativeMethods.OpenQueryWindowParams();
                openQueryWindowParams.cbStruct = 
                    (uint)Marshal.SizeOf(typeof(UnsafeNativeMethods.OpenQueryWindowParams));
                openQueryWindowParams.dwFlags = UnsafeNativeMethods.OQWF_DEFAULTFORM |
                                                UnsafeNativeMethods.OQWF_OKCANCEL |
                                                UnsafeNativeMethods.OQWF_SHOWOPTIONAL | 
                                                UnsafeNativeMethods.OQWF_REMOVEFORMS |
                                                UnsafeNativeMethods.OQWF_HIDEMENUS; 
                openQueryWindowParams.clsidHandler = UnsafeNativeMethods.CLSID_DsQuery; 
                openQueryWindowParams.pHandlerParameters = queryInitParamsPtr;
                openQueryWindowParams.clsidDefaultForm = 
                    UnsafeNativeMethods.CLSID_DsFindPeople; //Bring up the people picker
                openQueryWindowParams.pPersistQuery = IntPtr.Zero;      //We aren't persisting this query anywhere
                openQueryWindowParams.pFormParameters = IntPtr.Zero;    //We aren't pre-populating the form
 
                //Invoke the OpenQueryWindow method on the ICommonQuery object,
                //which will invoke the dialog and return any entered data in the 
                //"data" field. 
                //OpenQueryWindow will not return until the dialog is closed.
                hresult = commonQueryInstance.OpenQueryWindow(hWndParent, 
                                            ref openQueryWindowParams,
                                            out data);
            }
            finally 
            {
 
                //Free the memory used for our QueryInitParams structure. 
                Marshal.FreeCoTaskMem(queryInitParamsPtr);
                commonQueryInstance = null; 
            }

            if (hresult == UnsafeNativeMethods.S_OK)
            { 
                //The user pressed "OK," so we can return the selected data
                return data; 
            } 
            else if (hresult == UnsafeNativeMethods.S_FALSE)
            { 
                //The user canceled out, so we just return null.
                return null;
            }
            else 
            {
                //An error condition was reported, we throw an exception with the 
                //hresult included. 
                throw new InvalidOperationException(
                    String.Format(CultureInfo.CurrentCulture, 
                        SR.Get(SRID.PeoplePickerErrorConditionFromOpenQueryWindow), hresult));
            }

        } 

        /// 
 
        /// Turns a set of AD paths (in the form 'LDAP://CN=...') into a set of 
        /// e-mail addresses by looking up the paths in the Directory and retrieving
        /// the 'mail' property, if it exists for the given AD object. 
        /// 
        /// 
        ///     Critical:    We assert DirectoryServices Permissions here in order to
        ///                  get information about a DirectoryEntry. 
        /// 
        ///  
        ///  
        [SecurityCritical]
        private String[] GetEmailAddressesFromPaths(String[] paths) 
        {
            List addresses = new List(paths.Length);

            for (int i = 0; i < paths.Length; i++) 
            {
                PropertyValueCollection emailCollection = null; 
                DirectoryEntry directoryEntry = null; 

                //Assert for DirectoryServicesPermissions. 
                //This unfortunately must be for Unrestricted permissions because the
                //DirectoryEntry ctor makes a demand for Unrestricted permissions.
                new DirectoryServicesPermission(
                    PermissionState.Unrestricted).Assert(); //BlessedAssert 
                try
                { 
                    //Create a DirectoryEntry pointing to the current path; 
                    //Attempt to retrieve the "mail" field.
                    directoryEntry = new DirectoryEntry(paths[i]); 
                }
                finally
                {
                    //Revert the DirectoryServicesPermission assert 
                    DirectoryServicesPermission.RevertAssert();
                } 
 
                emailCollection =
                        directoryEntry.Properties[_adEmailAddressKey]; 

                if (emailCollection != null && emailCollection.Count > 0)
                {
                    //We have a non-empty e-mail collection; we will add the 
                    //first available e-mail address.
                    String address = emailCollection[0] as String; 
 
                    if (address != null)
                    { 
                        addresses.Add(address);
                    }
                }
 
            }
 
            return addresses.ToArray(); 
        }
 
        /// 

        /// Verifies that the given parent HWND is either null or an RMPublishingDialog
        /// Windows Form.
        /// 
 
        /// 
        /// 
        ///  
        ///     Critical:  - Takes a pointer to an HWnd which it uses to validate.
        ///  
        [SecurityCritical]
        private void ValidateHWnd(IntPtr hWndParent)
        {
            if( hWndParent != IntPtr.Zero ) 
            {
                System.Windows.Forms.Control rmPublishingDialog = 
                    System.Windows.Forms.Control.FromHandle(hWndParent) as RMPublishingDialog; 

                if (rmPublishingDialog == null) 
                {
                    throw new InvalidOperationException(SR.Get(SRID.PeoplePickerInvalidParentWindow));
                }
            } 
        }
 
        #endregion Private Methods 

        //----------------------------------------------------- 
        //
        //  Private Fields
        //
        //------------------------------------------------------ 
        #region Private Fields
 
        //The key name for the ActiveDirectory E-Mail address property 
        private const String _adEmailAddressKey = "mail";
 
        #region DsObjectNamesWrapper Class

        /// 

        /// The DsObjectNamesWrapper class wraps a DsObjectNames Struct thus hiding 
        /// the complexity of the unmanaged->managed mangling that's necessary to
        /// retrieve the object names we need therein. 
        /// 
        /// This is used in PeoplePickerWrapper.ParseDataFromHandle to simplify the code.
        /// 
 
        private class DsObjectNamesWrapper : IDisposable
        {
            /// 

            /// Static constructor for DsObjectNamesWrapper. 
            /// 
            ///  
            /// Critical: 
            ///  1) We have non-critical static constants that make use of Marshal.SizeOf() to
            ///     calculate sizes and offsets, which cause a link demand when invoked. 
            ///     Having a Critical static constructor allows these demands to be satisfied.
            /// 
            [SecurityCritical]
            static DsObjectNamesWrapper() 
            {
                // Do not remove! (See above Security comment) 
            } 

            /// 
 
            /// Constructs a new DsObjectNamesWrapper given a MemoryStream containing
            /// a raw representation of a DsObjectNames object.
            /// 
            ///  
            /// Critical:
            ///  1) Manipulates critical data fields 
            ///  
            /// A pointer to a valid DsObjectNames struct
            [SecurityCritical] 
            internal DsObjectNamesWrapper(System.IO.MemoryStream dataStream)
            {
                if (dataStream == null)
                { 
                    throw new ArgumentNullException("dataStream");
                } 
 
                //We need to get a pointer to this data for our DsObjectNamesWrapper
                //to wrap. 
                //First we convert the stream to an array of bytes.
                byte[] data = dataStream.ToArray();

                //Allocate memory to store an unmanaged copy of this data 
                _ptrToDsObjectNames = Marshal.AllocHGlobal(data.Length);
                Invariant.Assert(_ptrToDsObjectNames != IntPtr.Zero, "Invalid pointer to DsObjectNames data."); 
 
                //Marshal the data over to the unmanaged side
                Marshal.Copy(data, 0, _ptrToDsObjectNames, data.Length); 

                //Get a DsObjectNames structure out of the pointer we
                //were handed.
                _dsObjectNames = 
                    (UnsafeNativeMethods.DsObjectNames)Marshal.PtrToStructure(
                        _ptrToDsObjectNames, typeof(UnsafeNativeMethods.DsObjectNames)); 
 
            }
 
            /// 

            /// Finalizer for DsObjectNamesWrapper, ensures that unmanaged resources are properly
            /// cleaned up.
            /// 
 
            /// 
            /// Critical: 
            ///  1) Invokes the Dispose method which is Critical. 
            /// 
            [SecurityCritical] 
            ~DsObjectNamesWrapper()
            {
                this.Dispose();
            } 

            /// 
 
            /// The number of names in the DsObjectNames struct this class is wrapping. 
            /// 
            ///  
            /// Critical:
            ///  1) Manipulates critical data fields
            /// 
            internal uint Count 
            {
                [SecurityCritical] 
                get 
                {
                    ThrowIfDisposed(); 
                    return _dsObjectNames.cItems;
                }
            }
 
            /// 

            /// An array of names contained within the DsObjectNames struct. 
            /// 
 
            /// 
            /// Critical: 
            ///  1) Manipulates critical data fields
            /// 
            internal String[] Names
            { 
                [SecurityCritical]
                get 
                { 
                    ThrowIfDisposed();
 
                    if (_names == null)
                    {
                        _names = GetNamesFromDsObjectStruct();
                    } 

                    return _names; 
                } 
            }
 
            /// 

            /// Gets the list of names from the struct.
            /// 
            ///  
            /// 
            /// Critical: 
            ///  1) Manipulates critical data fields 
            /// 
            ///  
            [SecurityCritical]
            private String[] GetNamesFromDsObjectStruct()
            {
                ThrowIfDisposed(); 

                String[] names = new string[Count]; 
 
                for (int i = 0; i < Count; i++)
                { 
                    names[i] = BuildStringForItemName(i);
                }

                return names; 
            }
 
            /// 
 
            /// Extracts the name for the specified entry number from the DsObjectNames data
            /// 
 
            /// 
            /// Critical:
            ///  1) Manipulates critical data fields
            ///  
            /// The index of the name to retrieve
            ///  
            [SecurityCritical] 
            private String BuildStringForItemName(int index)
            { 
                ThrowIfDisposed();

                //Ensure we're within proper bounds.
                if (index < 0 || index >= Count) 
                {
                    throw new ArgumentOutOfRangeException("index"); 
                } 

                //First we have to get a DsObject out of the array (aObjects) of DsObjects. 
                //The information in this struct will tell us where to find the name data
                //we want.
                UnsafeNativeMethods.DsObject dsObject = GetDsObjectForIndex(index);
 
                //The offset of the name from the start of the DsObjectNames structure is stored in
                //the corresponding DsObject's offsetName field, so the pointer to the beginning of the 
                //string can be computed as: 
                //
                // offset = StartOfStructAddress + dsObject.offsetName; 
                IntPtr nameOffset = new IntPtr(_ptrToDsObjectNames.ToInt64() + dsObject.offsetName);

                //We marshal this pointer to a string and return it.
                return Marshal.PtrToStringAuto(nameOffset); 
            }
 
            /// 
 
            /// Retrieves a DsObject structure from the "array" in our DsObjectNames structure.
            /// Because marshalling cannot properly marshal a nested, variable sized 
            /// array in a struct, we have to do this the hard way.
            /// That is, the "array" of DsObjects that's in our managed DsObjectNames structure
            /// definition is merely a pointer to a big chunk of data that we have to manually
            /// retrieve DsObjects from by manipulating pointers, rather than doing aObjects[i]. 
            /// 
            ///  
            /// Critical: 
            ///  1) Manipulates critical data fields
            ///  
            /// The index of the DsObject to retrieve
            /// 
            [SecurityCritical]
            private UnsafeNativeMethods.DsObject GetDsObjectForIndex(int index) 
            {
                ThrowIfDisposed(); 
 
                //Ensure we're within proper bounds.
                if (index < 0 || index >= Count) 
                {
                    throw new ArgumentOutOfRangeException("index");
                }
 
                //Now we calculate the offset of the specified array index.
                //This is the address of the first element in the array, plus 
                //the number of entries past that times the size of an entry, or: 
                //offset = StartOfStructAddress + FirstArrayEntryOffset + index * SizeOfEntry
 
                IntPtr offset = new IntPtr(_ptrToDsObjectNames.ToInt64() +
                    _dsObjectArrayFieldOffset +
                    index * _sizeOfDsObject);
 
                //Marshal that to a DsObject structure.
                UnsafeNativeMethods.DsObject dsObject = 
                        (UnsafeNativeMethods.DsObject)Marshal.PtrToStructure(offset, 
                            typeof(UnsafeNativeMethods.DsObject));
 
                return dsObject;

            }
 
            /// 

            /// Implemented to deal with FxCop rule UseSafeHandleToEncapsulateNativeResources 
            /// We can now assert that the code will not allow methods to be called after 
            /// we are disposed.
            /// 
 
            private void ThrowIfDisposed()
            {
                if (_isDisposed) throw new ObjectDisposedException("DsObjectNamesWrapper");
            } 

            /// 
 
            /// Cleans up the unmanaged memory allocations made by this object. 
            /// 
            ///  
            /// Critical:
            ///  1) Frees unmanaged memory
            /// 
            [SecurityCritical] 
            public void Dispose()
            { 
                lock (this) 
                {
                    if (!_isDisposed) 
                    {
                        Marshal.FreeHGlobal(_ptrToDsObjectNames);
                        _isDisposed = true;
                        GC.SuppressFinalize(this); 
                    }
                } 
            } 

            #region Private Fields 
            //-----------------------------------------------------
            //
            //  Private Fields
            // 
            //-----------------------------------------------------
 
            /// 
 
            /// Pointer to the DsObjectNames struct we're wrapping.
            /// We use this to calculate pointers to field offsets. 
            /// 
            /// 
            /// This is critical data both for set and get.
            ///  
            [SecurityCritical]
            private IntPtr                  _ptrToDsObjectNames; 
 
            /// 

            /// The list of names in the DsObjectNames struct 
            /// 
            /// 
            /// This is critical data both for set and get.
            ///  
            [SecurityCritical]
            private String[]                _names; 
 
            /// 

            /// The DsObjectNames struct we're wrapping. 
            /// 
            /// 
            /// This is critical data both for set and get.
            ///  
            [SecurityCritical]
            private UnsafeNativeMethods.DsObjectNames _dsObjectNames; 
 
            private bool _isDisposed;
 
            /// Useful constants:

            /// 

            /// The offset from the start of a DsObjectNames structure to the 
            /// DsObjects array.
            /// 
 
            private static readonly int _dsObjectArrayFieldOffset = 
                Marshal.SizeOf(typeof(Guid)) + Marshal.SizeOf(typeof(UInt32));
 
            /// 

            /// The size of a DsObject.
            /// 
 
            private static readonly int _sizeOfDsObject =
                Marshal.SizeOf(typeof(UnsafeNativeMethods.DsObject)); 
 
            #endregion Private Fields
 
        }

        #endregion DsObjectNamesWrapper Class
 
        #endregion Private Fields
    } 
} 

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


                        

                        

                        
                        

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