mirror of
https://github.com/reactos/reactos.git
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1420 lines
46 KiB
C
1420 lines
46 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS Client/Server Runtime SubSystem
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* FILE: subsystems/win32/csrsrv/api.c
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* PURPOSE: CSR Server DLL API LPC Implementation
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* "\Windows\ApiPort" port process management functions
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* PROGRAMMERS: Alex Ionescu (alex@relsoft.net)
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*/
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/* INCLUDES *******************************************************************/
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#include "srv.h"
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#include <ndk/kefuncs.h>
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#define NDEBUG
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#include <debug.h>
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/* GLOBALS ********************************************************************/
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BOOLEAN (*CsrClientThreadSetup)(VOID) = NULL;
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UNICODE_STRING CsrApiPortName;
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volatile ULONG CsrpStaticThreadCount;
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volatile ULONG CsrpDynamicThreadTotal;
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extern ULONG CsrMaxApiRequestThreads;
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/* FUNCTIONS ******************************************************************/
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/*++
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* @name CsrCallServerFromServer
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* @implemented NT4
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*
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* The CsrCallServerFromServer routine calls a CSR API from within a server.
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* It avoids using LPC messages since the request isn't coming from a client.
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*
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* @param ReceiveMsg
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* Pointer to the CSR API Message to send to the server.
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*
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* @param ReplyMsg
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* Pointer to the CSR API Message to receive from the server.
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*
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* @return STATUS_SUCCESS in case of success, STATUS_ILLEGAL_FUNCTION
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* if the ApiNumber is invalid, or STATUS_ACCESS_VIOLATION if there
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* was a problem executing the API.
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*
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* @remarks None.
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*
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*--*/
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NTSTATUS
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NTAPI
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CsrCallServerFromServer(IN PCSR_API_MESSAGE ReceiveMsg,
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IN OUT PCSR_API_MESSAGE ReplyMsg)
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{
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ULONG ServerId;
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PCSR_SERVER_DLL ServerDll;
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ULONG ApiId;
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CSR_REPLY_CODE ReplyCode = CsrReplyImmediately;
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/* Get the Server ID */
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ServerId = CSR_API_NUMBER_TO_SERVER_ID(ReceiveMsg->ApiNumber);
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/* Make sure that the ID is within limits, and the Server DLL loaded */
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if ((ServerId >= CSR_SERVER_DLL_MAX) ||
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(!(ServerDll = CsrLoadedServerDll[ServerId])))
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{
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/* We are beyond the Maximum Server ID */
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DPRINT1("CSRSS: %lx is invalid ServerDllIndex (%08x)\n", ServerId, ServerDll);
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ReplyMsg->Status = STATUS_ILLEGAL_FUNCTION;
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return STATUS_ILLEGAL_FUNCTION;
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}
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else
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{
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/* Get the API ID, normalized with our Base ID */
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ApiId = CSR_API_NUMBER_TO_API_ID(ReceiveMsg->ApiNumber) - ServerDll->ApiBase;
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/* Make sure that the ID is within limits, and the entry exists */
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if ((ApiId >= ServerDll->HighestApiSupported) ||
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((ServerDll->ValidTable) && !(ServerDll->ValidTable[ApiId])))
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{
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/* We are beyond the Maximum API ID, or it doesn't exist */
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DPRINT1("API: %d\n", ApiId);
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#ifdef CSR_DBG
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DPRINT1("CSRSS: %lx (%s) is invalid ApiTableIndex for %Z or is an "
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"invalid API to call from the server.\n",
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ApiId,
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((ServerDll->NameTable) && (ServerDll->NameTable[ApiId])) ?
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ServerDll->NameTable[ApiId] : "*** UNKNOWN ***",
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&ServerDll->Name);
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#endif
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// DbgBreakPoint();
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ReplyMsg->Status = STATUS_ILLEGAL_FUNCTION;
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return STATUS_ILLEGAL_FUNCTION;
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}
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}
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#ifdef CSR_DBG
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if (CsrDebug & 2)
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{
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DPRINT1("CSRSS: %s Api Request received from server process\n",
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ServerDll->NameTable[ApiId]);
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}
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#endif
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/* Validation complete, start SEH */
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_SEH2_TRY
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{
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/* Call the API, get the reply code and return the result */
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ReplyMsg->Status = ServerDll->DispatchTable[ApiId](ReceiveMsg, &ReplyCode);
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}
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_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
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{
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/* If we got an exception, return access violation */
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ReplyMsg->Status = STATUS_ACCESS_VIOLATION;
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}
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_SEH2_END;
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/* Return success */
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return STATUS_SUCCESS;
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}
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/*++
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* @name CsrApiHandleConnectionRequest
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*
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* The CsrApiHandleConnectionRequest routine handles and accepts a new
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* connection request to the CSR API LPC Port.
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*
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* @param ApiMessage
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* Pointer to the incoming CSR API Message which contains the
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* connection request.
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*
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* @return STATUS_SUCCESS in case of success, or status code which caused
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* the routine to error.
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*
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* @remarks This routine is responsible for attaching the Shared Section to
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* new clients connecting to CSR.
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*
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*--*/
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NTSTATUS
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NTAPI
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CsrApiHandleConnectionRequest(IN PCSR_API_MESSAGE ApiMessage)
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{
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PCSR_THREAD CsrThread = NULL;
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PCSR_PROCESS CsrProcess = NULL;
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NTSTATUS Status = STATUS_SUCCESS;
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PCSR_API_CONNECTINFO ConnectInfo = &ApiMessage->ConnectionInfo;
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BOOLEAN AllowConnection = FALSE;
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REMOTE_PORT_VIEW RemotePortView;
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HANDLE ServerPort;
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/* Acquire the Process Lock */
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CsrAcquireProcessLock();
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/* Lookup the CSR Thread */
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CsrThread = CsrLocateThreadByClientId(NULL, &ApiMessage->Header.ClientId);
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/* Check if we have a thread */
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if (CsrThread)
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{
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/* Get the Process and make sure we have it as well */
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CsrProcess = CsrThread->Process;
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if (CsrProcess)
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{
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/* Reference the Process */
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CsrLockedReferenceProcess(CsrProcess);
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/* Attach the Shared Section */
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Status = CsrSrvAttachSharedSection(CsrProcess, ConnectInfo);
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if (NT_SUCCESS(Status))
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{
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/* Allow the connection and return debugging flag */
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ConnectInfo->DebugFlags = CsrDebug;
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AllowConnection = TRUE;
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}
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/* Dereference the Process */
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CsrLockedDereferenceProcess(CsrProcess);
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}
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}
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/* Release the Process Lock */
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CsrReleaseProcessLock();
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/* Setup the Port View Structure */
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RemotePortView.Length = sizeof(REMOTE_PORT_VIEW);
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RemotePortView.ViewSize = 0;
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RemotePortView.ViewBase = NULL;
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/* Save the Process ID */
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ConnectInfo->ServerProcessId = NtCurrentTeb()->ClientId.UniqueProcess;
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/* Accept the Connection */
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Status = NtAcceptConnectPort(&ServerPort,
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AllowConnection ? UlongToPtr(CsrProcess->SequenceNumber) : 0,
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&ApiMessage->Header,
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AllowConnection,
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NULL,
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&RemotePortView);
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if (!NT_SUCCESS(Status))
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{
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DPRINT1("CSRSS: NtAcceptConnectPort - failed. Status == %X\n", Status);
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}
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else if (AllowConnection)
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{
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if (CsrDebug & 2)
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{
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DPRINT1("CSRSS: ClientId: %lx.%lx has ClientView: Base=%p, Size=%lx\n",
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ApiMessage->Header.ClientId.UniqueProcess,
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ApiMessage->Header.ClientId.UniqueThread,
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RemotePortView.ViewBase,
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RemotePortView.ViewSize);
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}
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/* Set some Port Data in the Process */
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CsrProcess->ClientPort = ServerPort;
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CsrProcess->ClientViewBase = (ULONG_PTR)RemotePortView.ViewBase;
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CsrProcess->ClientViewBounds = (ULONG_PTR)((ULONG_PTR)RemotePortView.ViewBase +
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(ULONG_PTR)RemotePortView.ViewSize);
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/* Complete the connection */
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Status = NtCompleteConnectPort(ServerPort);
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if (!NT_SUCCESS(Status))
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{
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DPRINT1("CSRSS: NtCompleteConnectPort - failed. Status == %X\n", Status);
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}
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}
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else
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{
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DPRINT1("CSRSS: Rejecting Connection Request from ClientId: %lx.%lx\n",
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ApiMessage->Header.ClientId.UniqueProcess,
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ApiMessage->Header.ClientId.UniqueThread);
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}
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/* Return status to caller */
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return Status;
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}
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/*++
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* @name CsrpCheckRequestThreads
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*
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* The CsrpCheckRequestThreads routine checks if there are no more threads
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* to handle CSR API Requests, and creates a new thread if possible, to
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* avoid starvation.
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*
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* @param None.
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*
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* @return STATUS_SUCCESS in case of success, STATUS_UNSUCCESSFUL
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* if a new thread couldn't be created.
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*
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* @remarks None.
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*
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*--*/
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NTSTATUS
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NTAPI
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CsrpCheckRequestThreads(VOID)
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{
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HANDLE hThread;
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CLIENT_ID ClientId;
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NTSTATUS Status;
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/* Decrease the count, and see if we're out */
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if (InterlockedDecrementUL(&CsrpStaticThreadCount) == 0)
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{
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/* Check if we've still got space for a Dynamic Thread */
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if (CsrpDynamicThreadTotal < CsrMaxApiRequestThreads)
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{
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/* Create a new dynamic thread */
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Status = RtlCreateUserThread(NtCurrentProcess(),
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NULL,
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TRUE,
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0,
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0,
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0,
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(PVOID)CsrApiRequestThread,
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NULL,
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&hThread,
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&ClientId);
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/* Check success */
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if (NT_SUCCESS(Status))
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{
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/* Increase the thread counts */
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InterlockedIncrementUL(&CsrpStaticThreadCount);
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InterlockedIncrementUL(&CsrpDynamicThreadTotal);
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/* Add a new server thread */
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if (CsrAddStaticServerThread(hThread,
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&ClientId,
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CsrThreadIsServerThread))
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{
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/* Activate it */
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NtResumeThread(hThread, NULL);
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}
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else
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{
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/* Failed to create a new static thread */
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InterlockedDecrementUL(&CsrpStaticThreadCount);
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InterlockedDecrementUL(&CsrpDynamicThreadTotal);
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/* Terminate it */
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DPRINT1("Failing\n");
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NtTerminateThread(hThread, 0);
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NtClose(hThread);
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/* Return */
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return STATUS_UNSUCCESSFUL;
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}
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}
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}
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}
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/* Success */
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return STATUS_SUCCESS;
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}
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/*++
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* @name CsrApiRequestThread
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*
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* The CsrApiRequestThread routine handles incoming messages or connection
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* requests on the CSR API LPC Port.
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*
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* @param Parameter
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* System-default user-defined parameter. Unused.
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*
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* @return The thread exit code, if the thread is terminated.
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*
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* @remarks Before listening on the port, the routine will first attempt
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* to connect to the user subsystem.
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*
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*--*/
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NTSTATUS
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NTAPI
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CsrApiRequestThread(IN PVOID Parameter)
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{
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PTEB Teb = NtCurrentTeb();
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LARGE_INTEGER TimeOut;
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PCSR_THREAD CurrentThread, CsrThread;
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NTSTATUS Status;
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CSR_REPLY_CODE ReplyCode;
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PCSR_API_MESSAGE ReplyMsg;
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CSR_API_MESSAGE ReceiveMsg;
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PCSR_PROCESS CsrProcess;
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PHARDERROR_MSG HardErrorMsg;
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PVOID PortContext;
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PCSR_SERVER_DLL ServerDll;
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PCLIENT_DIED_MSG ClientDiedMsg;
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PDBGKM_MSG DebugMessage;
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ULONG ServerId, ApiId, MessageType, i;
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HANDLE ReplyPort;
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/* Setup LPC loop port and message */
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ReplyMsg = NULL;
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ReplyPort = CsrApiPort;
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/* Connect to user32 */
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while (!CsrConnectToUser())
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{
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/* Set up the timeout for the connect (30 seconds) */
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TimeOut.QuadPart = -30 * 1000 * 1000 * 10;
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/* Keep trying until we get a response */
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Teb->Win32ClientInfo[0] = 0;
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NtDelayExecution(FALSE, &TimeOut);
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}
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/* Get our thread */
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CurrentThread = Teb->CsrClientThread;
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/* If we got an event... */
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if (Parameter)
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{
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/* Set it, to let stuff waiting on us load */
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Status = NtSetEvent((HANDLE)Parameter, NULL);
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ASSERT(NT_SUCCESS(Status));
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/* Increase the Thread Counts */
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InterlockedIncrementUL(&CsrpStaticThreadCount);
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InterlockedIncrementUL(&CsrpDynamicThreadTotal);
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}
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/* Now start the loop */
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while (TRUE)
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{
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/* Make sure the real CID is set */
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Teb->RealClientId = Teb->ClientId;
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/* Debug check */
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if (Teb->CountOfOwnedCriticalSections)
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{
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DPRINT1("CSRSRV: FATAL ERROR. CsrThread is Idle while holding %lu critical sections\n",
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Teb->CountOfOwnedCriticalSections);
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DPRINT1("CSRSRV: Last Receive Message %lx ReplyMessage %lx\n",
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&ReceiveMsg, ReplyMsg);
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DbgBreakPoint();
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}
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/* Wait for a message to come through */
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Status = NtReplyWaitReceivePort(ReplyPort,
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&PortContext,
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&ReplyMsg->Header,
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&ReceiveMsg.Header);
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/* Check if we didn't get success */
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if (Status != STATUS_SUCCESS)
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{
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/* Was it a failure or another success code? */
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if (!NT_SUCCESS(Status))
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{
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/* Check for specific status cases */
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if ((Status != STATUS_INVALID_CID) &&
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(Status != STATUS_UNSUCCESSFUL) &&
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((Status == STATUS_INVALID_HANDLE) || (ReplyPort == CsrApiPort)))
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{
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/* Notify the debugger */
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DPRINT1("CSRSS: ReceivePort failed - Status == %X\n", Status);
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DPRINT1("CSRSS: ReplyPortHandle %lx CsrApiPort %lx\n", ReplyPort, CsrApiPort);
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}
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/* We failed big time, so start out fresh */
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ReplyMsg = NULL;
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ReplyPort = CsrApiPort;
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continue;
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}
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else
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{
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/* A strange "success" code, just try again */
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DPRINT1("NtReplyWaitReceivePort returned \"success\" status 0x%x\n", Status);
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continue;
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}
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}
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/* Use whatever Client ID we got */
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Teb->RealClientId = ReceiveMsg.Header.ClientId;
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/* Get the Message Type */
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MessageType = ReceiveMsg.Header.u2.s2.Type;
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/* Handle connection requests */
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if (MessageType == LPC_CONNECTION_REQUEST)
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{
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/* Handle the Connection Request */
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CsrApiHandleConnectionRequest(&ReceiveMsg);
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ReplyMsg = NULL;
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ReplyPort = CsrApiPort;
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continue;
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}
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/* It's some other kind of request. Get the lock for the lookup */
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CsrAcquireProcessLock();
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/* Now do the lookup to get the CSR_THREAD */
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CsrThread = CsrLocateThreadByClientId(&CsrProcess,
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&ReceiveMsg.Header.ClientId);
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/* Did we find a thread? */
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if (!CsrThread)
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{
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/* This wasn't a CSR Thread, release lock */
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CsrReleaseProcessLock();
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/* If this was an exception, handle it */
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if (MessageType == LPC_EXCEPTION)
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{
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ReplyMsg = &ReceiveMsg;
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ReplyPort = CsrApiPort;
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ReplyMsg->Status = DBG_CONTINUE;
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}
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else if (MessageType == LPC_PORT_CLOSED ||
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MessageType == LPC_CLIENT_DIED)
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{
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/* The Client or Port are gone, loop again */
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ReplyMsg = NULL;
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ReplyPort = CsrApiPort;
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}
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else if (MessageType == LPC_ERROR_EVENT)
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{
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/* If it's a hard error, handle this too */
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HardErrorMsg = (PHARDERROR_MSG)&ReceiveMsg;
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/* Default it to unhandled */
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HardErrorMsg->Response = ResponseNotHandled;
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/* Check if there are free api threads */
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CsrpCheckRequestThreads();
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if (CsrpStaticThreadCount)
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{
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/* Loop every Server DLL */
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for (i = 0; i < CSR_SERVER_DLL_MAX; i++)
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{
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/* Get the Server DLL */
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ServerDll = CsrLoadedServerDll[i];
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/* Check if it's valid and if it has a Hard Error Callback */
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if ((ServerDll) && (ServerDll->HardErrorCallback))
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{
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/* Call it */
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ServerDll->HardErrorCallback(NULL /* == CsrThread */, HardErrorMsg);
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/* If it's handled, get out of here */
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if (HardErrorMsg->Response != ResponseNotHandled) break;
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}
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}
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}
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/* Increase the thread count */
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InterlockedIncrementUL(&CsrpStaticThreadCount);
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|
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/* If the response was 0xFFFFFFFF, we'll ignore it */
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if (HardErrorMsg->Response == 0xFFFFFFFF)
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{
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ReplyMsg = NULL;
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ReplyPort = CsrApiPort;
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}
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else
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{
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ReplyMsg = &ReceiveMsg;
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ReplyPort = CsrApiPort;
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}
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}
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else if (MessageType == LPC_REQUEST)
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{
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/* This is an API Message coming from a non-CSR Thread */
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ReplyMsg = &ReceiveMsg;
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ReplyPort = CsrApiPort;
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ReplyMsg->Status = STATUS_ILLEGAL_FUNCTION;
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}
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else if (MessageType == LPC_DATAGRAM)
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{
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/* This is an API call, get the Server ID */
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ServerId = CSR_API_NUMBER_TO_SERVER_ID(ReceiveMsg.ApiNumber);
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|
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/* Make sure that the ID is within limits, and the Server DLL loaded */
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ServerDll = NULL;
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if ((ServerId >= CSR_SERVER_DLL_MAX) ||
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(!(ServerDll = CsrLoadedServerDll[ServerId])))
|
|
{
|
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/* We are beyond the Maximum Server ID */
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|
DPRINT1("CSRSS: %lx is invalid ServerDllIndex (%08x)\n",
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ServerId, ServerDll);
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// DbgBreakPoint();
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ReplyMsg = NULL;
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ReplyPort = CsrApiPort;
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continue;
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}
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|
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/* Get the API ID, normalized with our Base ID */
|
|
ApiId = CSR_API_NUMBER_TO_API_ID(ReceiveMsg.ApiNumber) - ServerDll->ApiBase;
|
|
|
|
/* Make sure that the ID is within limits, and the entry exists */
|
|
if (ApiId >= ServerDll->HighestApiSupported)
|
|
{
|
|
/* We are beyond the Maximum API ID, or it doesn't exist */
|
|
DPRINT1("CSRSS: %lx is invalid ApiTableIndex for %Z\n",
|
|
CSR_API_NUMBER_TO_API_ID(ReceiveMsg.ApiNumber),
|
|
&ServerDll->Name);
|
|
|
|
ReplyPort = CsrApiPort;
|
|
ReplyMsg = NULL;
|
|
continue;
|
|
}
|
|
|
|
#ifdef CSR_DBG
|
|
if (CsrDebug & 2)
|
|
{
|
|
DPRINT1("[%02x] CSRSS: [%02x,%02x] - %s Api called from %08x\n",
|
|
Teb->ClientId.UniqueThread,
|
|
ReceiveMsg.Header.ClientId.UniqueProcess,
|
|
ReceiveMsg.Header.ClientId.UniqueThread,
|
|
ServerDll->NameTable[ApiId],
|
|
NULL);
|
|
}
|
|
#endif
|
|
|
|
/* Assume success */
|
|
ReceiveMsg.Status = STATUS_SUCCESS;
|
|
|
|
/* Validation complete, start SEH */
|
|
_SEH2_TRY
|
|
{
|
|
/* Make sure we have enough threads */
|
|
CsrpCheckRequestThreads();
|
|
|
|
/* Call the API and get the reply code */
|
|
ReplyMsg = NULL;
|
|
ReplyPort = CsrApiPort;
|
|
ServerDll->DispatchTable[ApiId](&ReceiveMsg, &ReplyCode);
|
|
|
|
/* Increase the static thread count */
|
|
InterlockedIncrementUL(&CsrpStaticThreadCount);
|
|
}
|
|
_SEH2_EXCEPT(CsrUnhandledExceptionFilter(_SEH2_GetExceptionInformation()))
|
|
{
|
|
ReplyMsg = NULL;
|
|
ReplyPort = CsrApiPort;
|
|
}
|
|
_SEH2_END;
|
|
}
|
|
else
|
|
{
|
|
/* Some other ignored message type */
|
|
ReplyMsg = NULL;
|
|
ReplyPort = CsrApiPort;
|
|
}
|
|
|
|
/* Keep going */
|
|
continue;
|
|
}
|
|
|
|
/* We have a valid thread, was this an LPC Request? */
|
|
if (MessageType != LPC_REQUEST)
|
|
{
|
|
/* It's not an API, check if the client died */
|
|
if (MessageType == LPC_CLIENT_DIED)
|
|
{
|
|
/* Get the information and check if it matches our thread */
|
|
ClientDiedMsg = (PCLIENT_DIED_MSG)&ReceiveMsg;
|
|
if (ClientDiedMsg->CreateTime.QuadPart == CsrThread->CreateTime.QuadPart)
|
|
{
|
|
/* Now we reply to the dying client */
|
|
ReplyPort = CsrThread->Process->ClientPort;
|
|
|
|
/* Reference the thread */
|
|
CsrLockedReferenceThread(CsrThread);
|
|
|
|
/* Destroy the thread in the API Message */
|
|
CsrDestroyThread(&ReceiveMsg.Header.ClientId);
|
|
|
|
/* Check if the thread was actually ourselves */
|
|
if (CsrProcess->ThreadCount == 1)
|
|
{
|
|
/* Kill the process manually here */
|
|
CsrDestroyProcess(&CsrThread->ClientId, 0);
|
|
}
|
|
|
|
/* Remove our extra reference */
|
|
CsrLockedDereferenceThread(CsrThread);
|
|
}
|
|
|
|
/* Release the lock and keep looping */
|
|
CsrReleaseProcessLock();
|
|
|
|
ReplyMsg = NULL;
|
|
ReplyPort = CsrApiPort;
|
|
continue;
|
|
}
|
|
|
|
/* Reference the thread and release the lock */
|
|
CsrLockedReferenceThread(CsrThread);
|
|
CsrReleaseProcessLock();
|
|
|
|
/* Check if this was an exception */
|
|
if (MessageType == LPC_EXCEPTION)
|
|
{
|
|
/* Kill the process */
|
|
NtTerminateProcess(CsrProcess->ProcessHandle, STATUS_ABANDONED);
|
|
|
|
/* Destroy it from CSR */
|
|
CsrDestroyProcess(&ReceiveMsg.Header.ClientId, STATUS_ABANDONED);
|
|
|
|
/* Return a Debug Message */
|
|
DebugMessage = (PDBGKM_MSG)&ReceiveMsg;
|
|
DebugMessage->ReturnedStatus = DBG_CONTINUE;
|
|
ReplyMsg = &ReceiveMsg;
|
|
ReplyPort = CsrApiPort;
|
|
|
|
/* Remove our extra reference */
|
|
CsrDereferenceThread(CsrThread);
|
|
}
|
|
else if (MessageType == LPC_ERROR_EVENT)
|
|
{
|
|
/* If it's a hard error, handle this too */
|
|
HardErrorMsg = (PHARDERROR_MSG)&ReceiveMsg;
|
|
|
|
/* Default it to unhandled */
|
|
HardErrorMsg->Response = ResponseNotHandled;
|
|
|
|
/* Check if there are free api threads */
|
|
CsrpCheckRequestThreads();
|
|
if (CsrpStaticThreadCount)
|
|
{
|
|
/* Loop every Server DLL */
|
|
for (i = 0; i < CSR_SERVER_DLL_MAX; i++)
|
|
{
|
|
/* Get the Server DLL */
|
|
ServerDll = CsrLoadedServerDll[i];
|
|
|
|
/* Check if it's valid and if it has a Hard Error Callback */
|
|
if ((ServerDll) && (ServerDll->HardErrorCallback))
|
|
{
|
|
/* Call it */
|
|
ServerDll->HardErrorCallback(CsrThread, HardErrorMsg);
|
|
|
|
/* If it's handled, get out of here */
|
|
if (HardErrorMsg->Response != ResponseNotHandled) break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Increase the thread count */
|
|
InterlockedIncrementUL(&CsrpStaticThreadCount);
|
|
|
|
/* If the response was 0xFFFFFFFF, we'll ignore it */
|
|
if (HardErrorMsg->Response == 0xFFFFFFFF)
|
|
{
|
|
ReplyMsg = NULL;
|
|
ReplyPort = CsrApiPort;
|
|
}
|
|
else
|
|
{
|
|
CsrDereferenceThread(CsrThread);
|
|
ReplyMsg = &ReceiveMsg;
|
|
ReplyPort = CsrApiPort;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Something else */
|
|
CsrDereferenceThread(CsrThread);
|
|
ReplyMsg = NULL;
|
|
}
|
|
|
|
/* Keep looping */
|
|
continue;
|
|
}
|
|
|
|
/* We got an API Request */
|
|
CsrLockedReferenceThread(CsrThread);
|
|
CsrReleaseProcessLock();
|
|
|
|
/* This is an API call, get the Server ID */
|
|
ServerId = CSR_API_NUMBER_TO_SERVER_ID(ReceiveMsg.ApiNumber);
|
|
|
|
/* Make sure that the ID is within limits, and the Server DLL loaded */
|
|
ServerDll = NULL;
|
|
if ((ServerId >= CSR_SERVER_DLL_MAX) ||
|
|
(!(ServerDll = CsrLoadedServerDll[ServerId])))
|
|
{
|
|
/* We are beyond the Maximum Server ID */
|
|
DPRINT1("CSRSS: %lx is invalid ServerDllIndex (%08x)\n",
|
|
ServerId, ServerDll);
|
|
// DbgBreakPoint();
|
|
|
|
ReplyPort = CsrApiPort;
|
|
ReplyMsg = &ReceiveMsg;
|
|
ReplyMsg->Status = STATUS_ILLEGAL_FUNCTION;
|
|
CsrDereferenceThread(CsrThread);
|
|
continue;
|
|
}
|
|
|
|
/* Get the API ID, normalized with our Base ID */
|
|
ApiId = CSR_API_NUMBER_TO_API_ID(ReceiveMsg.ApiNumber) - ServerDll->ApiBase;
|
|
|
|
/* Make sure that the ID is within limits, and the entry exists */
|
|
if (ApiId >= ServerDll->HighestApiSupported)
|
|
{
|
|
/* We are beyond the Maximum API ID, or it doesn't exist */
|
|
DPRINT1("CSRSS: %lx is invalid ApiTableIndex for %Z\n",
|
|
CSR_API_NUMBER_TO_API_ID(ReceiveMsg.ApiNumber),
|
|
&ServerDll->Name);
|
|
|
|
ReplyPort = CsrApiPort;
|
|
ReplyMsg = &ReceiveMsg;
|
|
ReplyMsg->Status = STATUS_ILLEGAL_FUNCTION;
|
|
CsrDereferenceThread(CsrThread);
|
|
continue;
|
|
}
|
|
|
|
#ifdef CSR_DBG
|
|
if (CsrDebug & 2)
|
|
{
|
|
DPRINT1("[%02x] CSRSS: [%02x,%02x] - %s Api called from %08x, Process %08x - %08x\n",
|
|
Teb->ClientId.UniqueThread,
|
|
ReceiveMsg.Header.ClientId.UniqueProcess,
|
|
ReceiveMsg.Header.ClientId.UniqueThread,
|
|
ServerDll->NameTable[ApiId],
|
|
CsrThread,
|
|
CsrThread->Process,
|
|
CsrProcess);
|
|
}
|
|
#endif
|
|
|
|
/* Assume success */
|
|
ReplyMsg = &ReceiveMsg;
|
|
ReceiveMsg.Status = STATUS_SUCCESS;
|
|
|
|
/* Now we reply to a particular client */
|
|
ReplyPort = CsrThread->Process->ClientPort;
|
|
|
|
/* Check if there's a capture buffer */
|
|
if (ReceiveMsg.CsrCaptureData)
|
|
{
|
|
/* Capture the arguments */
|
|
if (!CsrCaptureArguments(CsrThread, &ReceiveMsg))
|
|
{
|
|
/* Ignore this message if we failed to get the arguments */
|
|
CsrDereferenceThread(CsrThread);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* Validation complete, start SEH */
|
|
_SEH2_TRY
|
|
{
|
|
/* Make sure we have enough threads */
|
|
CsrpCheckRequestThreads();
|
|
|
|
Teb->CsrClientThread = CsrThread;
|
|
|
|
/* Call the API, get the reply code and return the result */
|
|
ReplyCode = CsrReplyImmediately;
|
|
ReplyMsg->Status = ServerDll->DispatchTable[ApiId](&ReceiveMsg, &ReplyCode);
|
|
|
|
/* Increase the static thread count */
|
|
InterlockedIncrementUL(&CsrpStaticThreadCount);
|
|
|
|
Teb->CsrClientThread = CurrentThread;
|
|
|
|
if (ReplyCode == CsrReplyAlreadySent)
|
|
{
|
|
if (ReceiveMsg.CsrCaptureData)
|
|
{
|
|
CsrReleaseCapturedArguments(&ReceiveMsg);
|
|
}
|
|
ReplyMsg = NULL;
|
|
ReplyPort = CsrApiPort;
|
|
CsrDereferenceThread(CsrThread);
|
|
}
|
|
else if (ReplyCode == CsrReplyDeadClient)
|
|
{
|
|
/* Reply to the death message */
|
|
NtReplyPort(ReplyPort, &ReplyMsg->Header);
|
|
|
|
/* Reply back to the API port now */
|
|
ReplyMsg = NULL;
|
|
ReplyPort = CsrApiPort;
|
|
|
|
CsrDereferenceThread(CsrThread);
|
|
}
|
|
else if (ReplyCode == CsrReplyPending)
|
|
{
|
|
ReplyMsg = NULL;
|
|
ReplyPort = CsrApiPort;
|
|
}
|
|
else
|
|
{
|
|
if (ReceiveMsg.CsrCaptureData)
|
|
{
|
|
CsrReleaseCapturedArguments(&ReceiveMsg);
|
|
}
|
|
CsrDereferenceThread(CsrThread);
|
|
}
|
|
}
|
|
_SEH2_EXCEPT(CsrUnhandledExceptionFilter(_SEH2_GetExceptionInformation()))
|
|
{
|
|
ReplyMsg = NULL;
|
|
ReplyPort = CsrApiPort;
|
|
}
|
|
_SEH2_END;
|
|
}
|
|
|
|
/* We're out of the loop for some reason, terminate! */
|
|
NtTerminateThread(NtCurrentThread(), Status);
|
|
return Status;
|
|
}
|
|
|
|
/*++
|
|
* @name CsrApiPortInitialize
|
|
*
|
|
* The CsrApiPortInitialize routine initializes the LPC Port used for
|
|
* communications with the Client/Server Runtime (CSR) and initializes the
|
|
* static thread that will handle connection requests and APIs.
|
|
*
|
|
* @param None
|
|
*
|
|
* @return STATUS_SUCCESS in case of success, STATUS_UNSUCCESSFUL otherwise.
|
|
*
|
|
* @remarks None.
|
|
*
|
|
*--*/
|
|
NTSTATUS
|
|
NTAPI
|
|
CsrApiPortInitialize(VOID)
|
|
{
|
|
ULONG Size;
|
|
OBJECT_ATTRIBUTES ObjectAttributes;
|
|
NTSTATUS Status;
|
|
HANDLE hRequestEvent, hThread;
|
|
CLIENT_ID ClientId;
|
|
PLIST_ENTRY ListHead, NextEntry;
|
|
PCSR_THREAD ServerThread;
|
|
|
|
/* Calculate how much space we'll need for the Port Name */
|
|
Size = CsrDirectoryName.Length + sizeof(CSR_PORT_NAME) + sizeof(WCHAR);
|
|
|
|
/* Create the buffer for it */
|
|
CsrApiPortName.Buffer = RtlAllocateHeap(CsrHeap, 0, Size);
|
|
if (!CsrApiPortName.Buffer) return STATUS_NO_MEMORY;
|
|
|
|
/* Setup the rest of the empty string */
|
|
CsrApiPortName.Length = 0;
|
|
CsrApiPortName.MaximumLength = (USHORT)Size;
|
|
RtlAppendUnicodeStringToString(&CsrApiPortName, &CsrDirectoryName);
|
|
RtlAppendUnicodeToString(&CsrApiPortName, UNICODE_PATH_SEP);
|
|
RtlAppendUnicodeToString(&CsrApiPortName, CSR_PORT_NAME);
|
|
if (CsrDebug & 1)
|
|
{
|
|
DPRINT1("CSRSS: Creating %wZ port and associated threads\n", &CsrApiPortName);
|
|
DPRINT1("CSRSS: sizeof( CONNECTINFO ) == %ld sizeof( API_MSG ) == %ld\n",
|
|
sizeof(CSR_API_CONNECTINFO), sizeof(CSR_API_MESSAGE));
|
|
}
|
|
|
|
/* FIXME: Create a Security Descriptor */
|
|
|
|
/* Initialize the Attributes */
|
|
InitializeObjectAttributes(&ObjectAttributes,
|
|
&CsrApiPortName,
|
|
0,
|
|
NULL,
|
|
NULL /* FIXME: Use the Security Descriptor */);
|
|
|
|
/* Create the Port Object */
|
|
Status = NtCreatePort(&CsrApiPort,
|
|
&ObjectAttributes,
|
|
sizeof(CSR_API_CONNECTINFO),
|
|
sizeof(CSR_API_MESSAGE),
|
|
16 * PAGE_SIZE);
|
|
if (NT_SUCCESS(Status))
|
|
{
|
|
/* Create the event the Port Thread will use */
|
|
Status = NtCreateEvent(&hRequestEvent,
|
|
EVENT_ALL_ACCESS,
|
|
NULL,
|
|
SynchronizationEvent,
|
|
FALSE);
|
|
if (NT_SUCCESS(Status))
|
|
{
|
|
/* Create the Request Thread */
|
|
Status = RtlCreateUserThread(NtCurrentProcess(),
|
|
NULL,
|
|
TRUE,
|
|
0,
|
|
0,
|
|
0,
|
|
(PVOID)CsrApiRequestThread,
|
|
(PVOID)hRequestEvent,
|
|
&hThread,
|
|
&ClientId);
|
|
if (NT_SUCCESS(Status))
|
|
{
|
|
/* Add this as a static thread to CSRSRV */
|
|
CsrAddStaticServerThread(hThread, &ClientId, CsrThreadIsServerThread);
|
|
|
|
/* Get the Thread List Pointers */
|
|
ListHead = &CsrRootProcess->ThreadList;
|
|
NextEntry = ListHead->Flink;
|
|
|
|
/* Start looping the list */
|
|
while (NextEntry != ListHead)
|
|
{
|
|
/* Get the Thread */
|
|
ServerThread = CONTAINING_RECORD(NextEntry, CSR_THREAD, Link);
|
|
|
|
/* Start it up */
|
|
Status = NtResumeThread(ServerThread->ThreadHandle, NULL);
|
|
|
|
/* Is this a Server Thread? */
|
|
if (ServerThread->Flags & CsrThreadIsServerThread)
|
|
{
|
|
/* If so, then wait for it to initialize */
|
|
Status = NtWaitForSingleObject(hRequestEvent, FALSE, NULL);
|
|
ASSERT(NT_SUCCESS(Status));
|
|
}
|
|
|
|
/* Next thread */
|
|
NextEntry = NextEntry->Flink;
|
|
}
|
|
|
|
/* We don't need this anymore */
|
|
NtClose(hRequestEvent);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Return */
|
|
return Status;
|
|
}
|
|
|
|
/*++
|
|
* @name CsrConnectToUser
|
|
* @implemented NT4
|
|
*
|
|
* The CsrConnectToUser connects to the User subsystem.
|
|
*
|
|
* @param None
|
|
*
|
|
* @return A pointer to the CSR Thread
|
|
*
|
|
* @remarks None.
|
|
*
|
|
*--*/
|
|
PCSR_THREAD
|
|
NTAPI
|
|
CsrConnectToUser(VOID)
|
|
{
|
|
NTSTATUS Status;
|
|
ANSI_STRING DllName;
|
|
UNICODE_STRING TempName;
|
|
HANDLE hUser32;
|
|
STRING StartupName;
|
|
PTEB Teb = NtCurrentTeb();
|
|
PCSR_THREAD CsrThread;
|
|
BOOLEAN Connected;
|
|
|
|
/* Check if we didn't already find it */
|
|
if (!CsrClientThreadSetup)
|
|
{
|
|
/* Get the DLL Handle for user32.dll */
|
|
RtlInitAnsiString(&DllName, "user32");
|
|
RtlAnsiStringToUnicodeString(&TempName, &DllName, TRUE);
|
|
Status = LdrGetDllHandle(NULL,
|
|
NULL,
|
|
&TempName,
|
|
&hUser32);
|
|
RtlFreeUnicodeString(&TempName);
|
|
|
|
/* If we got the handle, get the Client Thread Startup Entrypoint */
|
|
if (NT_SUCCESS(Status))
|
|
{
|
|
RtlInitAnsiString(&StartupName,"ClientThreadSetup");
|
|
Status = LdrGetProcedureAddress(hUser32,
|
|
&StartupName,
|
|
0,
|
|
(PVOID)&CsrClientThreadSetup);
|
|
}
|
|
}
|
|
|
|
/* Connect to user32 */
|
|
_SEH2_TRY
|
|
{
|
|
Connected = CsrClientThreadSetup();
|
|
}
|
|
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
|
|
{
|
|
Connected = FALSE;
|
|
} _SEH2_END;
|
|
|
|
if (!Connected)
|
|
{
|
|
DPRINT1("CSRSS: CsrConnectToUser failed\n");
|
|
return NULL;
|
|
}
|
|
|
|
/* Save pointer to this thread in TEB */
|
|
CsrAcquireProcessLock();
|
|
CsrThread = CsrLocateThreadInProcess(NULL, &Teb->ClientId);
|
|
CsrReleaseProcessLock();
|
|
if (CsrThread) Teb->CsrClientThread = CsrThread;
|
|
|
|
/* Return it */
|
|
return CsrThread;
|
|
}
|
|
|
|
/*++
|
|
* @name CsrQueryApiPort
|
|
* @implemented NT4
|
|
*
|
|
* The CsrQueryApiPort routine returns a handle to the CSR API LPC port.
|
|
*
|
|
* @param None.
|
|
*
|
|
* @return A handle to the port.
|
|
*
|
|
* @remarks None.
|
|
*
|
|
*--*/
|
|
HANDLE
|
|
NTAPI
|
|
CsrQueryApiPort(VOID)
|
|
{
|
|
return CsrApiPort;
|
|
}
|
|
|
|
/*++
|
|
* @name CsrCaptureArguments
|
|
* @implemented NT5.1
|
|
*
|
|
* The CsrCaptureArguments routine validates a CSR Capture Buffer and
|
|
* re-captures it into a server CSR Capture Buffer.
|
|
*
|
|
* @param CsrThread
|
|
* Pointer to the CSR Thread performing the validation.
|
|
*
|
|
* @param ApiMessage
|
|
* Pointer to the CSR API Message containing the Capture Buffer
|
|
* that needs to be validated.
|
|
*
|
|
* @return TRUE if validation succeeded, FALSE otherwise.
|
|
*
|
|
* @remarks None.
|
|
*
|
|
*--*/
|
|
BOOLEAN
|
|
NTAPI
|
|
CsrCaptureArguments(IN PCSR_THREAD CsrThread,
|
|
IN PCSR_API_MESSAGE ApiMessage)
|
|
{
|
|
PCSR_CAPTURE_BUFFER LocalCaptureBuffer = NULL, RemoteCaptureBuffer = NULL;
|
|
SIZE_T BufferDistance;
|
|
ULONG Length = 0;
|
|
ULONG PointerCount;
|
|
PULONG_PTR OffsetPointer;
|
|
ULONG_PTR CurrentOffset;
|
|
|
|
/* Use SEH to make sure this is valid */
|
|
_SEH2_TRY
|
|
{
|
|
/* Get the buffer we got from whoever called NTDLL */
|
|
LocalCaptureBuffer = ApiMessage->CsrCaptureData;
|
|
Length = LocalCaptureBuffer->Size;
|
|
|
|
/* Now check if the buffer is inside our mapped section */
|
|
if (((ULONG_PTR)LocalCaptureBuffer < CsrThread->Process->ClientViewBase) ||
|
|
(((ULONG_PTR)LocalCaptureBuffer + Length) >= CsrThread->Process->ClientViewBounds))
|
|
{
|
|
/* Return failure */
|
|
DPRINT1("*** CSRSS: CaptureBuffer outside of ClientView\n");
|
|
ApiMessage->Status = STATUS_INVALID_PARAMETER;
|
|
_SEH2_YIELD(return FALSE);
|
|
}
|
|
|
|
/* Check if the Length is valid */
|
|
if ((FIELD_OFFSET(CSR_CAPTURE_BUFFER, PointerOffsetsArray) +
|
|
(LocalCaptureBuffer->PointerCount * sizeof(PVOID)) > Length) ||
|
|
(LocalCaptureBuffer->PointerCount > MAXUSHORT))
|
|
{
|
|
/* Return failure */
|
|
DPRINT1("*** CSRSS: CaptureBuffer %p has bad length\n", LocalCaptureBuffer);
|
|
DbgBreakPoint();
|
|
ApiMessage->Status = STATUS_INVALID_PARAMETER;
|
|
_SEH2_YIELD(return FALSE);
|
|
}
|
|
}
|
|
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
|
|
{
|
|
/* Return failure */
|
|
ApiMessage->Status = STATUS_INVALID_PARAMETER;
|
|
_SEH2_YIELD(return FALSE);
|
|
} _SEH2_END;
|
|
|
|
/* We validated the incoming buffer, now allocate the remote one */
|
|
RemoteCaptureBuffer = RtlAllocateHeap(CsrHeap, HEAP_ZERO_MEMORY, Length);
|
|
if (!RemoteCaptureBuffer)
|
|
{
|
|
/* We're out of memory */
|
|
ApiMessage->Status = STATUS_NO_MEMORY;
|
|
return FALSE;
|
|
}
|
|
|
|
/* Copy the client's buffer */
|
|
RtlMoveMemory(RemoteCaptureBuffer, LocalCaptureBuffer, Length);
|
|
|
|
/* Calculate the difference between our buffer and the client's */
|
|
BufferDistance = (ULONG_PTR)RemoteCaptureBuffer - (ULONG_PTR)LocalCaptureBuffer;
|
|
|
|
/*
|
|
* All the pointer offsets correspond to pointers which point
|
|
* to the remote data buffer instead of the local one.
|
|
*/
|
|
PointerCount = RemoteCaptureBuffer->PointerCount;
|
|
OffsetPointer = RemoteCaptureBuffer->PointerOffsetsArray;
|
|
while (PointerCount--)
|
|
{
|
|
CurrentOffset = *OffsetPointer;
|
|
|
|
if (CurrentOffset != 0)
|
|
{
|
|
/* Get the pointer corresponding to the offset */
|
|
CurrentOffset += (ULONG_PTR)ApiMessage;
|
|
|
|
/* Validate the bounds of the current pointed pointer */
|
|
if ((*(PULONG_PTR)CurrentOffset >= CsrThread->Process->ClientViewBase) &&
|
|
(*(PULONG_PTR)CurrentOffset < CsrThread->Process->ClientViewBounds))
|
|
{
|
|
/* Modify the pointed pointer to take into account its new position */
|
|
*(PULONG_PTR)CurrentOffset += BufferDistance;
|
|
}
|
|
else
|
|
{
|
|
/* Invalid pointer, fail */
|
|
DPRINT1("*** CSRSS: CaptureBuffer MessagePointer outside of ClientView\n");
|
|
DbgBreakPoint();
|
|
ApiMessage->Status = STATUS_INVALID_PARAMETER;
|
|
}
|
|
}
|
|
|
|
++OffsetPointer;
|
|
}
|
|
|
|
/* Check if we got success */
|
|
if (ApiMessage->Status != STATUS_SUCCESS)
|
|
{
|
|
/* Failure. Free the buffer and return */
|
|
RtlFreeHeap(CsrHeap, 0, RemoteCaptureBuffer);
|
|
return FALSE;
|
|
}
|
|
else
|
|
{
|
|
/* Success, save the previous buffer and use the remote capture buffer */
|
|
RemoteCaptureBuffer->PreviousCaptureBuffer = LocalCaptureBuffer;
|
|
ApiMessage->CsrCaptureData = RemoteCaptureBuffer;
|
|
}
|
|
|
|
/* Success */
|
|
return TRUE;
|
|
}
|
|
|
|
/*++
|
|
* @name CsrReleaseCapturedArguments
|
|
* @implemented NT5.1
|
|
*
|
|
* The CsrReleaseCapturedArguments routine releases a Capture Buffer
|
|
* that was previously captured with CsrCaptureArguments.
|
|
*
|
|
* @param ApiMessage
|
|
* Pointer to the CSR API Message containing the Capture Buffer
|
|
* that needs to be released.
|
|
*
|
|
* @return None.
|
|
*
|
|
* @remarks None.
|
|
*
|
|
*--*/
|
|
VOID
|
|
NTAPI
|
|
CsrReleaseCapturedArguments(IN PCSR_API_MESSAGE ApiMessage)
|
|
{
|
|
PCSR_CAPTURE_BUFFER RemoteCaptureBuffer, LocalCaptureBuffer;
|
|
SIZE_T BufferDistance;
|
|
ULONG PointerCount;
|
|
PULONG_PTR OffsetPointer;
|
|
ULONG_PTR CurrentOffset;
|
|
|
|
/* Get the remote capture buffer */
|
|
RemoteCaptureBuffer = ApiMessage->CsrCaptureData;
|
|
|
|
/* Do not continue if there is no captured buffer */
|
|
if (!RemoteCaptureBuffer) return;
|
|
|
|
/* If there is one, get the corresponding local capture buffer */
|
|
LocalCaptureBuffer = RemoteCaptureBuffer->PreviousCaptureBuffer;
|
|
|
|
/* Free the previous one and use again the local capture buffer */
|
|
RemoteCaptureBuffer->PreviousCaptureBuffer = NULL;
|
|
ApiMessage->CsrCaptureData = LocalCaptureBuffer;
|
|
|
|
/* Calculate the difference between our buffer and the client's */
|
|
BufferDistance = (ULONG_PTR)RemoteCaptureBuffer - (ULONG_PTR)LocalCaptureBuffer;
|
|
|
|
/*
|
|
* All the pointer offsets correspond to pointers which point
|
|
* to the local data buffer instead of the remote one (revert
|
|
* the logic of CsrCaptureArguments).
|
|
*/
|
|
PointerCount = RemoteCaptureBuffer->PointerCount;
|
|
OffsetPointer = RemoteCaptureBuffer->PointerOffsetsArray;
|
|
while (PointerCount--)
|
|
{
|
|
CurrentOffset = *OffsetPointer;
|
|
|
|
if (CurrentOffset != 0)
|
|
{
|
|
/* Get the pointer corresponding to the offset */
|
|
CurrentOffset += (ULONG_PTR)ApiMessage;
|
|
|
|
/* Modify the pointed pointer to take into account its new position */
|
|
*(PULONG_PTR)CurrentOffset -= BufferDistance;
|
|
}
|
|
|
|
++OffsetPointer;
|
|
}
|
|
|
|
/* Copy the data back */
|
|
RtlMoveMemory(LocalCaptureBuffer, RemoteCaptureBuffer, RemoteCaptureBuffer->Size);
|
|
|
|
/* Free our allocated buffer */
|
|
RtlFreeHeap(CsrHeap, 0, RemoteCaptureBuffer);
|
|
}
|
|
|
|
/*++
|
|
* @name CsrValidateMessageBuffer
|
|
* @implemented NT5.1
|
|
*
|
|
* The CsrValidateMessageBuffer routine validates a captured message buffer
|
|
* present in the CSR Api Message
|
|
*
|
|
* @param ApiMessage
|
|
* Pointer to the CSR API Message containing the CSR Capture Buffer.
|
|
*
|
|
* @param Buffer
|
|
* Pointer to the message buffer to validate.
|
|
*
|
|
* @param ElementCount
|
|
* Number of elements contained in the message buffer.
|
|
*
|
|
* @param ElementSize
|
|
* Size of each element.
|
|
*
|
|
* @return TRUE if validation succeeded, FALSE otherwise.
|
|
*
|
|
* @remarks None.
|
|
*
|
|
*--*/
|
|
BOOLEAN
|
|
NTAPI
|
|
CsrValidateMessageBuffer(IN PCSR_API_MESSAGE ApiMessage,
|
|
IN PVOID *Buffer,
|
|
IN ULONG ElementCount,
|
|
IN ULONG ElementSize)
|
|
{
|
|
PCSR_CAPTURE_BUFFER CaptureBuffer = ApiMessage->CsrCaptureData;
|
|
SIZE_T BufferDistance = (ULONG_PTR)Buffer - (ULONG_PTR)ApiMessage;
|
|
ULONG PointerCount;
|
|
PULONG_PTR OffsetPointer;
|
|
|
|
/*
|
|
* Check whether we have a valid buffer pointer, elements
|
|
* of non-trivial size and that we don't overflow.
|
|
*/
|
|
if (!Buffer || ElementSize == 0 ||
|
|
(ULONGLONG)ElementCount * ElementSize > (ULONGLONG)0xFFFFFFFF)
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
/* Check if didn't get a buffer and there aren't any arguments to check */
|
|
// if (!*Buffer && (ElementCount * ElementSize == 0))
|
|
if (!*Buffer && ElementCount == 0) // Here ElementSize != 0 therefore only ElementCount can be == 0
|
|
return TRUE;
|
|
|
|
/* Check if we have no capture buffer */
|
|
if (!CaptureBuffer)
|
|
{
|
|
/*
|
|
* In this case, check only the Process ID
|
|
* and if there is a match, we succeed.
|
|
*/
|
|
if (NtCurrentTeb()->ClientId.UniqueProcess ==
|
|
ApiMessage->Header.ClientId.UniqueProcess)
|
|
{
|
|
return TRUE;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Make sure that there is still space left in the buffer */
|
|
if ((CaptureBuffer->Size - (ULONG_PTR)*Buffer + (ULONG_PTR)CaptureBuffer) >=
|
|
(ElementCount * ElementSize))
|
|
{
|
|
/* Perform the validation test */
|
|
PointerCount = CaptureBuffer->PointerCount;
|
|
OffsetPointer = CaptureBuffer->PointerOffsetsArray;
|
|
while (PointerCount--)
|
|
{
|
|
/*
|
|
* The pointer offset must be equal to the delta between
|
|
* the addresses of the buffer and of the API message.
|
|
*/
|
|
if (*OffsetPointer == BufferDistance)
|
|
{
|
|
return TRUE;
|
|
}
|
|
++OffsetPointer;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Failure */
|
|
DPRINT1("CSRSRV: Bad message buffer %p\n", ApiMessage);
|
|
DbgBreakPoint();
|
|
return FALSE;
|
|
}
|
|
|
|
/*++
|
|
* @name CsrValidateMessageString
|
|
* @implemented NT5.1
|
|
*
|
|
* The CsrValidateMessageString validates a captured Wide-Character String
|
|
* present in a CSR API Message.
|
|
*
|
|
* @param ApiMessage
|
|
* Pointer to the CSR API Message containing the CSR Capture Buffer.
|
|
*
|
|
* @param MessageString
|
|
* Pointer to the buffer containing the string to validate.
|
|
*
|
|
* @return TRUE if validation succeeded, FALSE otherwise.
|
|
*
|
|
* @remarks None.
|
|
*
|
|
*--*/
|
|
BOOLEAN
|
|
NTAPI
|
|
CsrValidateMessageString(IN PCSR_API_MESSAGE ApiMessage,
|
|
IN LPWSTR *MessageString)
|
|
{
|
|
if (MessageString)
|
|
{
|
|
return CsrValidateMessageBuffer(ApiMessage,
|
|
(PVOID*)MessageString,
|
|
wcslen(*MessageString) + 1,
|
|
sizeof(WCHAR));
|
|
}
|
|
else
|
|
{
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/* EOF */
|