UIAgentRequest.cs source code in C# .NET

                        Code:
                         / WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / infocard / Service / managed / Microsoft / InfoCards / UIAgentRequest.cs / 1 / UIAgentRequest.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------
//
// Presharp uses the c# pragma mechanism to supress its warnings. 
// These are not recognised by the base compiler so we need to explictly
// disable the following warnings. See http://winweb/cse/Tools/PREsharp/userguide/default.asp 
// for details. 
//
#pragma warning disable 1634, 1691      // unknown message, unknown pragma 



namespace Microsoft.InfoCards 
{
    using System; 
    using System.Collections.Generic; 
    using System.ComponentModel;
    using System.Diagnostics; 
    using System.Security; //SecurityException
    using IDT = Microsoft.InfoCards.Diagnostics.InfoCardTrace;
    using System.Security.Principal; //WindowsIdentity
    using Microsoft.Win32.SafeHandles; //SafeWaitHandle 
    using System.IO; //Stream
    using System.Runtime.InteropServices; 
 
    //
    // Summary: Base class to represent UI Agent RPC requests 
    //
    internal abstract class UIAgentRequest : Request
    {
        // Holds the parent request that this UI Agent RPC call was initiated by 
        ClientUIRequest m_parentRequest;
 
        // 
        // Summary: Constructor to initialize member variables
        // 
        public UIAgentRequest( IntPtr rpcHandle, Stream inArgs, Stream outArgs, ClientUIRequest parent )
            : this( rpcHandle, inArgs, outArgs, parent, ExceptionList.Empty )
        {
 
        }
 
        // 
        // Summary: Constructor to initialize member variables
        // 
        public UIAgentRequest( IntPtr rpcHandle, Stream inArgs, Stream outArgs, ClientUIRequest parent, ExceptionList exceptionList )
            : base( rpcHandle, inArgs, outArgs, exceptionList )
        {
            m_parentRequest = parent; 
        }
 
        public ClientUIRequest ParentRequest 
        {
            get { return m_parentRequest; } 
        }

        protected InfoCardUIAgent UIAgent
        { 
            get
            { 
                if( null != ParentRequest ) 
                {
                    return ParentRequest.UIAgent; 
                }
                return null;
            }
        } 

 
 
        //
        // Summary: 
        // Called by native RPC code in order to pre-authorize the incoming UI Agent.
        //
        // Remarks:
        // If this method returns a non zero result then the ui agent will be denied access to any 
        // of the UI Agent RPC interface functions.
        // 
        // Parameters: 
        // rpcIfHandle    - an RPC interface handle.
        // context        - an RPC context handle. 
        //
        static public uint Authorize( IntPtr rpcIfHandle, IntPtr context )
        {
 
            uint err = NativeMethods.ERROR_ACCESS_DENIED;
 
            if( IntPtr.Zero == rpcIfHandle ) 
            {
                throw IDT.ThrowHelperArgumentNull( "rpcIfHandle" ); 
            }

            if( IntPtr.Zero == context )
            { 
                throw IDT.ThrowHelperArgumentNull( "context" );
            } 
 
            try
            { 
                WindowsIdentity id = Utility.GetWindowsIdentity( context );

                try
                { 
                    //
                    // The calling process should be in our list of PID's 
                    // created and additionally, the PID should have the 
                    // matching trusted user SID associated with that PID.
                    // 
                    uint pid = Utility.GetRpcClientPid( context );
                    IDT.TraceDebug( "Incoming process id is {0}", pid);

                    InfoCardUIAgent icUIAgent = InfoCardUIAgent.FindByPid( pid ); 
                    if ( null == icUIAgent )
                    { 
                        throw IDT.ThrowHelperError( new SecurityException() ); 
                    }
 
                    //
                    // Verify the trusted user SID.
                    //
                    NativeMcppMethods.CheckSIDAgainstCurrentRpcUser( icUIAgent.TrustedUserSid ); 

                    // 
                    // The client passed all checks, let them in. 
                    //
                    err = 0; 
                }
                finally
                {
                    id.Dispose(); 
                }
            } 
            catch ( SecurityException ) 
            {
                IDT.Assert( NativeMethods.ERROR_ACCESS_DENIED == err, "Unexpected value for err!" ); 
            }
            #pragma warning suppress 56500
            catch ( Exception e )
            { 
                InfoCardService.Crash( e );
            } 
            #pragma warning restore 56500 
            return err;
 
        }

        //
        // Summary: 
        // Called by native code in order to get the GetWorkCallback delegate for this instance of the uiagent.
        // 
        // Parameters: 
        // processId          - The pid of the calling process.
        // nativeEventHandle  - A native event handle that this class can use to get the attention of the 
        //                      UI Agent process.
        // callback           - The GetWorkCallback delegate to be returned.
        //
        static public void BindToService( 
                                IntPtr uiagentRpcHandle,
                                IntPtr nativeDesktopName, 
                                int cbUserSid, 
                                IntPtr pUserSid,
                                int cbTrustedSid, 
                                IntPtr pTrustedSid,
                                out IntPtr nativeStartEventHandle,
                                out IntPtr nativeCompleteEventHandle,
                                out RpcUIAgentGetWorkCallback callback ) 
        {
            string desktopName = Marshal.PtrToStringUni( nativeDesktopName ); 
            callback = null; 
            nativeStartEventHandle = IntPtr.Zero;
            nativeCompleteEventHandle = IntPtr.Zero; 
            using( WindowsIdentity identity = Utility.GetWindowsIdentity( uiagentRpcHandle ) )
            {
                WindowsImpersonationContext impersonationContext = identity.Impersonate();
 
                try
                { 
                    uint processId; 
                    int err = (int)NativeMethods.I_RpcBindingInqLocalClientPID( uiagentRpcHandle, out processId );
                    if( 0 != err ) 
                    {
                        throw IDT.ThrowHelperError( new CommunicationException( SR.GetString( SR.FailedToBindToService ) ) );
                    }
 
                    InfoCardUIAgent uiagent = InfoCardUIAgent.FindByPid( processId );
 
                    if( null != uiagent ) 
                    {
                        // 
                        // bind to the UIAgent.
                        //
                        SafeWaitHandle hStartEvent;
                        SafeWaitHandle hCompleteEvent; 
                        SecurityIdentifier trustedSid;
                        callback = uiagent.Bind( desktopName, out trustedSid, out hStartEvent, out hCompleteEvent ); 
 
                        //
                        // Copy the sids to the output buffer. 
                        //
                        byte[] buffer = new byte[ Math.Max( cbUserSid, cbTrustedSid ) ];

                        identity.User.GetBinaryForm( buffer, 0 ); 
                        Marshal.Copy( buffer, 0, pUserSid, cbUserSid );
 
                        trustedSid.GetBinaryForm( buffer, 0 ); 
                        Marshal.Copy( buffer, 0, pTrustedSid, cbTrustedSid );
 
                        //
                        // Capture the remove event handle.
                        //
                        nativeStartEventHandle = hStartEvent.DangerousGetHandle(); 
                        nativeCompleteEventHandle = hCompleteEvent.DangerousGetHandle();
                    } 
                } 
                finally
                { 
                    impersonationContext.Undo();
                }
            }
        } 

        public override WindowsIdentity RequestorIdentity 
        { 
            get{ return ParentRequest.RequestorIdentity; }
        } 

        protected override void OnInitializeAsSystem()
        {
            try 
            {
                // 
                // Do an access check to make certain that the incoming user has the correct 
                // truster user sid.
                // 
                NativeMcppMethods.CheckSIDAgainstCurrentRpcUser( ParentRequest.UIAgentLogonSid );
            }
            catch( Win32Exception e )
            { 
                throw IDT.ThrowHelperError( new InfoCardArgumentException( SR.GetString( SR.UnableToAuthenticateUIAgent ), e ) );
            } 
            catch( SecurityException e ) 
            {
                throw IDT.ThrowHelperError( new InfoCardArgumentException( SR.GetString( SR.UnableToAuthenticateUIAgent ), e ) ); 
            }
        }

        // 
        // Summary:
        // Retrive policy if parentrequest is of GetTokenRequest. Return null otherwise 
        // 
        protected InfoCardPolicy GetPolicy()
        { 
            GetTokenRequest gtr = ParentRequest as GetTokenRequest;
            if ( gtr == null )
            {
                return null; 
            }
            else 
            { 
                return gtr.Policy;
            } 

        }
    }
} 

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