#include <ntdll.h>
#include <ndk/lpcfuncs.h>
#include <csr/csrsrv.h>
#include <debug.h>

Include dependency graph for connect.c:

Macros
#define	NDEBUG

#define	UNICODE_PATH_SEP L"\\"

Typedefs
typedef NTSTATUS(NTAPI *	PCSR_SERVER_API_ROUTINE) (IN PPORT_MESSAGE Request, IN PPORT_MESSAGE Reply)

Functions
NTSTATUS NTAPI	CsrpConnectToServer (IN PWSTR ObjectDirectory)

NTSTATUS NTAPI	CsrClientConnectToServer (IN PWSTR ObjectDirectory, IN ULONG ServerId, IN PVOID ConnectionInfo, IN OUT PULONG ConnectionInfoSize, OUT PBOOLEAN ServerToServerCall)

NTSTATUS NTAPI	CsrClientCallServer (IN OUT PCSR_API_MESSAGE ApiMessage, IN OUT PCSR_CAPTURE_BUFFER CaptureBuffer OPTIONAL, IN CSR_API_NUMBER ApiNumber, IN ULONG DataLength)

HANDLE NTAPI	CsrGetProcessId (VOID)

Variables
HANDLE	CsrApiPort

HANDLE	CsrProcessId

HANDLE	CsrPortHeap

ULONG_PTR	CsrPortMemoryDelta

BOOLEAN	InsideCsrProcess = FALSE

PCSR_SERVER_API_ROUTINE	CsrServerApiRoutine

Macro Definition Documentation

◆ NDEBUG

#define NDEBUG

Definition at line 16 of file connect.c.

◆ UNICODE_PATH_SEP

#define UNICODE_PATH_SEP L"\\"

Definition at line 33 of file connect.c.

Typedef Documentation

◆ PCSR_SERVER_API_ROUTINE

typedef NTSTATUS(NTAPI * PCSR_SERVER_API_ROUTINE) (IN PPORT_MESSAGE Request, IN PPORT_MESSAGE Reply)

Definition at line 28 of file connect.c.

Function Documentation

◆ CsrClientCallServer()

NTSTATUS NTAPI CsrClientCallServer	(	IN OUT PCSR_API_MESSAGE	ApiMessage,
		IN OUT PCSR_CAPTURE_BUFFER CaptureBuffer	OPTIONAL,
		IN CSR_API_NUMBER	ApiNumber,
		IN ULONG	DataLength
	)

Definition at line 365 of file connect.c.

 {
     NTSTATUS Status;
     ULONG PointerCount;
     PULONG_PTR OffsetPointer;
 
     /* Make sure the length is valid */
     if (DataLength > (MAXSHORT - sizeof(CSR_API_MESSAGE)))
     {
         DPRINT1("DataLength too big: %lu", DataLength);
         return STATUS_INVALID_PARAMETER;
     }
 
     /* Fill out the Port Message Header */
     ApiMessage->Header.u2.ZeroInit = 0;
     ApiMessage->Header.u1.s1.TotalLength = (CSHORT)DataLength +
         sizeof(CSR_API_MESSAGE) - sizeof(ApiMessage->Data); // FIELD_OFFSET(CSR_API_MESSAGE, Data) + DataLength;
     ApiMessage->Header.u1.s1.DataLength = (CSHORT)DataLength +
         FIELD_OFFSET(CSR_API_MESSAGE, Data) - sizeof(ApiMessage->Header); // ApiMessage->Header.u1.s1.TotalLength - sizeof(PORT_MESSAGE);
 
     /* Fill out the CSR Header */
     ApiMessage->ApiNumber = ApiNumber;
     ApiMessage->CsrCaptureData = NULL;
 
     DPRINT("API: %lx, u1.s1.DataLength: %x, u1.s1.TotalLength: %x\n",
            ApiNumber,
            ApiMessage->Header.u1.s1.DataLength,
            ApiMessage->Header.u1.s1.TotalLength);
 
     /* Check if we are already inside a CSR Server */
     if (!InsideCsrProcess)
     {
         /* Check if we got a Capture Buffer */
         if (CaptureBuffer)
         {
             /*
              * We have to convert from our local (client) view
              * to the remote (server) view.
              */
             ApiMessage->CsrCaptureData = (PCSR_CAPTURE_BUFFER)
                 ((ULONG_PTR)CaptureBuffer + CsrPortMemoryDelta);
 
             /* Lock the buffer. */
             CaptureBuffer->BufferEnd = NULL;
 
             /*
              * Each client pointer inside the CSR message is converted into
              * a server pointer, and each pointer to these message pointers
              * is converted into an offset.
              */
             PointerCount  = CaptureBuffer->PointerCount;
             OffsetPointer = CaptureBuffer->PointerOffsetsArray;
             while (PointerCount--)
             {
                 if (*OffsetPointer != 0)
                 {
                     *(PULONG_PTR)*OffsetPointer += CsrPortMemoryDelta;
                     *OffsetPointer -= (ULONG_PTR)ApiMessage;
                 }
                 ++OffsetPointer;
             }
         }
 
         /* Send the LPC Message */
         Status = NtRequestWaitReplyPort(CsrApiPort,
                                         &ApiMessage->Header,
                                         &ApiMessage->Header);
 
         /* Check if we got a Capture Buffer */
         if (CaptureBuffer)
         {
             /*
              * We have to convert back from the remote (server) view
              * to our local (client) view.
              */
             ApiMessage->CsrCaptureData = (PCSR_CAPTURE_BUFFER)
                 ((ULONG_PTR)ApiMessage->CsrCaptureData - CsrPortMemoryDelta);
 
             /*
              * Convert back the offsets into pointers to CSR message
              * pointers, and convert back these message server pointers
              * into client pointers.
              */
             PointerCount  = CaptureBuffer->PointerCount;
             OffsetPointer = CaptureBuffer->PointerOffsetsArray;
             while (PointerCount--)
             {
                 if (*OffsetPointer != 0)
                 {
                     *OffsetPointer += (ULONG_PTR)ApiMessage;
                     *(PULONG_PTR)*OffsetPointer -= CsrPortMemoryDelta;
                 }
                 ++OffsetPointer;
             }
         }
 
         /* Check for success */
         if (!NT_SUCCESS(Status))
         {
             /* We failed. Overwrite the return value with the failure. */
             DPRINT1("LPC Failed: %lx\n", Status);
             ApiMessage->Status = Status;
         }
     }
     else
     {
         /* This is a server-to-server call. Save our CID and do a direct call. */
         DPRINT("Next gen server-to-server call\n");
 
         /* We check this equality inside CsrValidateMessageBuffer */
         ApiMessage->Header.ClientId = NtCurrentTeb()->ClientId;
 
         Status = CsrServerApiRoutine(&ApiMessage->Header,
                                      &ApiMessage->Header);
 
         /* Check for success */
         if (!NT_SUCCESS(Status))
         {
             /* We failed. Overwrite the return value with the failure. */
             ApiMessage->Status = Status;
         }
     }
 
     /* Return the CSR Result */
     DPRINT("Got back: 0x%lx\n", ApiMessage->Status);
     return ApiMessage->Status;
 }

Referenced by BaseCheckForVDM(), BaseCheckVDM(), BasepNotifyCsrOfThread(), BaseUpdateVDMEntry(), CloseConsoleHandle(), ConsoleMenuControl(), CreateConsoleScreenBuffer(), CreateProcessInternalW(), CsrClientConnectToServer(), CsrIdentifyAlertableThread(), CsrSetPriorityClass(), DefineDosDeviceW(), DuplicateConsoleHandle(), EndTask(), ExitProcess(), ExitVDM(), ExitWindowsWorker(), FlushConsoleInputBuffer(), FreeConsole(), GenerateConsoleCtrlEvent(), GetConsoleCP(), GetConsoleCursorInfo(), GetConsoleDisplayMode(), GetConsoleFontInfo(), GetConsoleFontSize(), GetConsoleHandleInformation(), GetConsoleHardwareState(), GetConsoleMode(), GetConsoleOutputCP(), GetConsoleProcessList(), GetConsoleScreenBufferInfo(), GetConsoleSelectionInfo(), GetConsoleWindow(), GetCurrentConsoleFont(), GetLargestConsoleWindowSize(), GetNextVDMCommand(), GetNumberOfConsoleFonts(), GetNumberOfConsoleInputEvents(), GetNumberOfConsoleMouseButtons(), GetProcessShutdownParameters(), GetTempFileNameW(), GetThreadDesktop(), GetVDMCurrentDirectories(), IntAddConsoleAlias(), IntAllocConsole(), IntAttachConsole(), IntExpungeConsoleCommandHistory(), IntFillConsoleOutputCode(), IntGetConsoleAlias(), IntGetConsoleAliases(), IntGetConsoleAliasesLength(), IntGetConsoleAliasExes(), IntGetConsoleAliasExesLength(), IntGetConsoleCommandHistory(), IntGetConsoleCommandHistoryLength(), IntGetConsoleInput(), IntGetConsoleKeyboardLayoutName(), IntGetConsoleTitle(), IntReadConsole(), IntReadConsoleOutput(), IntReadConsoleOutputCode(), IntScrollConsoleScreenBuffer(), IntSetConsoleNumberOfCommands(), IntSetConsoleTitle(), IntWriteConsole(), IntWriteConsoleInput(), IntWriteConsoleOutput(), IntWriteConsoleOutputCode(), InvalidateConsoleDIBits(), Logon(), NotifySoundSentry(), OpenConsoleW(), RegisterConsoleVDM(), RegisterLogonProcess(), RegisterServicesProcess(), SetConsoleActiveScreenBuffer(), SetConsoleCommandHistoryMode(), SetConsoleCP(), SetConsoleCursor(), SetConsoleCursorInfo(), SetConsoleCursorPosition(), SetConsoleDisplayMode(), SetConsoleFont(), SetConsoleHandleInformation(), SetConsoleHardwareState(), SetConsoleIcon(), SetConsoleMenuClose(), SetConsoleMode(), SetConsoleOutputCP(), SetConsolePalette(), SetConsoleScreenBufferSize(), SetConsoleTextAttribute(), SetConsoleWindowInfo(), SetLastConsoleEventActive(), SetProcessShutdownParameters(), SetVDMCurrentDirectories(), ShowConsoleCursor(), and VerifyConsoleIoHandle().

◆ CsrClientConnectToServer()

NTSTATUS NTAPI CsrClientConnectToServer	(	IN PWSTR	ObjectDirectory,
		IN ULONG	ServerId,
		IN PVOID	ConnectionInfo,
		IN OUT PULONG	ConnectionInfoSize,
		OUT PBOOLEAN	ServerToServerCall
	)

Definition at line 197 of file connect.c.

 {
     NTSTATUS Status;
     PIMAGE_NT_HEADERS NtHeader;
     UNICODE_STRING CsrSrvName;
     HANDLE hCsrSrv;
     ANSI_STRING CsrServerRoutineName;
     CSR_API_MESSAGE ApiMessage;
     PCSR_CLIENT_CONNECT ClientConnect = &ApiMessage.Data.CsrClientConnect;
     PCSR_CAPTURE_BUFFER CaptureBuffer;
 
     DPRINT("CsrClientConnectToServer: %lx %p\n", ServerId, ConnectionInfo);
 
     /* Validate the Connection Info */
     if (ConnectionInfo && (!ConnectionInfoSize || !*ConnectionInfoSize))
     {
         DPRINT1("Connection info given, but no length\n");
         return STATUS_INVALID_PARAMETER;
     }
 
     /* Check if we're inside a CSR Process */
     if (InsideCsrProcess)
     {
         /* Tell the client that we're already inside CSR */
         if (ServerToServerCall) *ServerToServerCall = TRUE;
         return STATUS_SUCCESS;
     }
 
     /*
      * We might be in a CSR Process but not know it, if this is the first call.
      * So let's find out.
      */
     if (!(NtHeader = RtlImageNtHeader(NtCurrentPeb()->ImageBaseAddress)))
     {
         /* The image isn't valid */
         DPRINT1("Invalid image\n");
         return STATUS_INVALID_IMAGE_FORMAT;
     }
     InsideCsrProcess = (NtHeader->OptionalHeader.Subsystem == IMAGE_SUBSYSTEM_NATIVE);
 
     /* Now we can check if we are inside or not */
     if (InsideCsrProcess)
     {
         /* We're inside, so let's find csrsrv */
         DPRINT("Next-GEN CSRSS support\n");
         RtlInitUnicodeString(&CsrSrvName, L"csrsrv");
         Status = LdrGetDllHandle(NULL,
                                  NULL,
                                  &CsrSrvName,
                                  &hCsrSrv);
 
         /* Now get the Server to Server routine */
         RtlInitAnsiString(&CsrServerRoutineName, "CsrCallServerFromServer");
         Status = LdrGetProcedureAddress(hCsrSrv,
                                         &CsrServerRoutineName,
                                         0L,
                                         (PVOID*)&CsrServerApiRoutine);
 
         /* Use the local heap as port heap */
         CsrPortHeap = RtlGetProcessHeap();
 
         /* Tell the caller we're inside the server */
         if (ServerToServerCall) *ServerToServerCall = InsideCsrProcess;
         return STATUS_SUCCESS;
     }
 
     /* Now check if connection info is given */
     if (ConnectionInfo)
     {
         /* Well, we're definitely in a client now */
         InsideCsrProcess = FALSE;
 
         /* Do we have a connection to CSR yet? */
         if (!CsrApiPort)
         {
             /* No, set it up now */
             Status = CsrpConnectToServer(ObjectDirectory);
             if (!NT_SUCCESS(Status))
             {
                 /* Failed */
                 DPRINT1("Failure to connect to CSR\n");
                 return Status;
             }
         }
 
         /* Setup the connect message header */
         ClientConnect->ServerId = ServerId;
         ClientConnect->ConnectionInfoSize = *ConnectionInfoSize;
 
         /* Setup a buffer for the connection info */
         CaptureBuffer = CsrAllocateCaptureBuffer(1, ClientConnect->ConnectionInfoSize);
         if (CaptureBuffer == NULL)
         {
             return STATUS_INSUFFICIENT_RESOURCES;
         }
 
         /* Capture the connection info data */
         CsrCaptureMessageBuffer(CaptureBuffer,
                                 ConnectionInfo,
                                 ClientConnect->ConnectionInfoSize,
                                 &ClientConnect->ConnectionInfo);
 
         /* Return the allocated length */
         *ConnectionInfoSize = ClientConnect->ConnectionInfoSize;
 
         /* Call CSR */
         Status = CsrClientCallServer(&ApiMessage,
                                      CaptureBuffer,
                                      CSR_CREATE_API_NUMBER(CSRSRV_SERVERDLL_INDEX, CsrpClientConnect),
                                      sizeof(CSR_CLIENT_CONNECT));
 
         /* Copy the updated connection info data back into the user buffer */
         RtlMoveMemory(ConnectionInfo,
                       ClientConnect->ConnectionInfo,
                       *ConnectionInfoSize);
 
         /* Free the capture buffer */
         CsrFreeCaptureBuffer(CaptureBuffer);
     }
     else
     {
         /* No connection info, just return */
         Status = STATUS_SUCCESS;
     }
 
     /* Let the caller know if this was server to server */
     DPRINT("Status was: 0x%lx. Are we in server: 0x%x\n", Status, InsideCsrProcess);
     if (ServerToServerCall) *ServerToServerCall = InsideCsrProcess;
 
     return Status;
 }

Referenced by ConnectConsole(), and DllMain().

◆ CsrGetProcessId()

HANDLE NTAPI CsrGetProcessId ( VOID )

Definition at line 501 of file connect.c.

 {
     return CsrProcessId;
 }

Referenced by ProcessIdToHandle().

◆ CsrpConnectToServer()

NTSTATUS NTAPI CsrpConnectToServer ( IN PWSTR ObjectDirectory )

Definition at line 39 of file connect.c.

 {
     NTSTATUS Status;
     SIZE_T PortNameLength;
     UNICODE_STRING PortName;
     LARGE_INTEGER CsrSectionViewSize;
     HANDLE CsrSectionHandle;
     PORT_VIEW LpcWrite;
     REMOTE_PORT_VIEW LpcRead;
     SECURITY_QUALITY_OF_SERVICE SecurityQos;
     SID_IDENTIFIER_AUTHORITY NtSidAuthority = {SECURITY_NT_AUTHORITY};
     PSID SystemSid = NULL;
     CSR_API_CONNECTINFO ConnectionInfo;
     ULONG ConnectionInfoLength = sizeof(CSR_API_CONNECTINFO);
 
     DPRINT("%s(%S)\n", __FUNCTION__, ObjectDirectory);
 
     /* Binary compatibility with MS KERNEL32 */
     if (NULL == ObjectDirectory)
     {
         ObjectDirectory = L"\\Windows";
     }
 
     /* Calculate the total port name size */
     PortNameLength = ((wcslen(ObjectDirectory) + 1) * sizeof(WCHAR)) +
                      sizeof(CSR_PORT_NAME);
     if (PortNameLength > UNICODE_STRING_MAX_BYTES)
     {
         DPRINT1("PortNameLength too big: %Iu", PortNameLength);
         return STATUS_NAME_TOO_LONG;
     }
 
     /* Set the port name */
     PortName.Length = 0;
     PortName.MaximumLength = (USHORT)PortNameLength;
 
     /* Allocate a buffer for it */
     PortName.Buffer = RtlAllocateHeap(RtlGetProcessHeap(), HEAP_ZERO_MEMORY, PortNameLength);
     if (PortName.Buffer == NULL)
     {
         return STATUS_INSUFFICIENT_RESOURCES;
     }
 
     /* Create the name */
     RtlAppendUnicodeToString(&PortName, ObjectDirectory );
     RtlAppendUnicodeToString(&PortName, UNICODE_PATH_SEP);
     RtlAppendUnicodeToString(&PortName, CSR_PORT_NAME);
 
     /* Create a section for the port memory */
     CsrSectionViewSize.QuadPart = CSR_CSRSS_SECTION_SIZE;
     Status = NtCreateSection(&CsrSectionHandle,
                              SECTION_ALL_ACCESS,
                              NULL,
                              &CsrSectionViewSize,
                              PAGE_READWRITE,
                              SEC_RESERVE,
                              NULL);
     if (!NT_SUCCESS(Status))
     {
         DPRINT1("Failure allocating CSR Section\n");
         return Status;
     }
 
     /* Set up the port view structures to match them with the section */
     LpcWrite.Length = sizeof(PORT_VIEW);
     LpcWrite.SectionHandle = CsrSectionHandle;
     LpcWrite.SectionOffset = 0;
     LpcWrite.ViewSize = CsrSectionViewSize.u.LowPart;
     LpcWrite.ViewBase = 0;
     LpcWrite.ViewRemoteBase = 0;
     LpcRead.Length = sizeof(REMOTE_PORT_VIEW);
     LpcRead.ViewSize = 0;
     LpcRead.ViewBase = 0;
 
     /* Setup the QoS */
     SecurityQos.ImpersonationLevel = SecurityImpersonation;
     SecurityQos.ContextTrackingMode = SECURITY_DYNAMIC_TRACKING;
     SecurityQos.EffectiveOnly = TRUE;
 
     /* Setup the connection info */
     ConnectionInfo.DebugFlags = 0;
 
     /* Create a SID for us */
     Status = RtlAllocateAndInitializeSid(&NtSidAuthority,
                                          1,
                                          SECURITY_LOCAL_SYSTEM_RID,
                                          0,
                                          0,
                                          0,
                                          0,
                                          0,
                                          0,
                                          0,
                                          &SystemSid);
     if (!NT_SUCCESS(Status))
     {
         /* Failure */
         DPRINT1("Couldn't allocate SID\n");
         NtClose(CsrSectionHandle);
         return Status;
     }
 
     /* Connect to the port */
     Status = NtSecureConnectPort(&CsrApiPort,
                                  &PortName,
                                  &SecurityQos,
                                  &LpcWrite,
                                  SystemSid,
                                  &LpcRead,
                                  NULL,
                                  &ConnectionInfo,
                                  &ConnectionInfoLength);
     RtlFreeSid(SystemSid);
     NtClose(CsrSectionHandle);
     if (!NT_SUCCESS(Status))
     {
         /* Failure */
         DPRINT1("Couldn't connect to CSR port\n");
         return Status;
     }
 
     /* Save the delta between the sections, for capture usage later */
     CsrPortMemoryDelta = (ULONG_PTR)LpcWrite.ViewRemoteBase -
                          (ULONG_PTR)LpcWrite.ViewBase;
 
     /* Save the Process */
     CsrProcessId = ConnectionInfo.ServerProcessId;
 
     /* Save CSR Section data */
     NtCurrentPeb()->ReadOnlySharedMemoryBase = ConnectionInfo.SharedSectionBase;
     NtCurrentPeb()->ReadOnlySharedMemoryHeap = ConnectionInfo.SharedSectionHeap;
     NtCurrentPeb()->ReadOnlyStaticServerData = ConnectionInfo.SharedStaticServerData;
 
     /* Create the port heap */
     CsrPortHeap = RtlCreateHeap(0,
                                 LpcWrite.ViewBase,
                                 LpcWrite.ViewSize,
                                 PAGE_SIZE,
                                 0,
                                 0);
     if (CsrPortHeap == NULL)
     {
         /* Failure */
         DPRINT1("Couldn't create heap for CSR port\n");
         NtClose(CsrApiPort);
         CsrApiPort = NULL;
         return STATUS_INSUFFICIENT_RESOURCES;
     }
 
     /* Return success */
     return STATUS_SUCCESS;
 }