ReactOS  0.4.13-dev-100-gc8611ae
connect.c
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1 /*
2  * COPYRIGHT: See COPYING in the top level directory
3  * PROJECT: ReactOS kernel
4  * FILE: dll/ntdll/csr/connect.c
5  * PURPOSE: Routines for connecting and calling CSR
6  * PROGRAMMER: Alex Ionescu (alex@relsoft.net)
7  */
8 
9 /* INCLUDES *******************************************************************/
10 
11 #include <ntdll.h>
12 
13 #include <ndk/lpcfuncs.h>
14 #include <csr/csrsrv.h>
15 
16 #define NDEBUG
17 #include <debug.h>
18 
19 /* GLOBALS ********************************************************************/
20 
26 
27 typedef NTSTATUS
29  IN PPORT_MESSAGE Reply);
30 
32 
33 #define UNICODE_PATH_SEP L"\\"
34 
35 /* FUNCTIONS ******************************************************************/
36 
38 NTAPI
39 CsrpConnectToServer(IN PWSTR ObjectDirectory)
40 {
42  ULONG PortNameLength;
44  LARGE_INTEGER CsrSectionViewSize;
45  HANDLE CsrSectionHandle;
46  PORT_VIEW LpcWrite;
47  REMOTE_PORT_VIEW LpcRead;
48  SECURITY_QUALITY_OF_SERVICE SecurityQos;
50  PSID SystemSid = NULL;
51  CSR_API_CONNECTINFO ConnectionInfo;
52  ULONG ConnectionInfoLength = sizeof(CSR_API_CONNECTINFO);
53 
54  DPRINT("%s(%S)\n", __FUNCTION__, ObjectDirectory);
55 
56  /* Binary compatibility with MS KERNEL32 */
57  if (NULL == ObjectDirectory)
58  {
59  ObjectDirectory = L"\\Windows";
60  }
61 
62  /* Calculate the total port name size */
63  PortNameLength = ((wcslen(ObjectDirectory) + 1) * sizeof(WCHAR)) +
64  sizeof(CSR_PORT_NAME);
65 
66  /* Set the port name */
67  PortName.Length = 0;
68  PortName.MaximumLength = PortNameLength;
69 
70  /* Allocate a buffer for it */
71  PortName.Buffer = RtlAllocateHeap(RtlGetProcessHeap(), HEAP_ZERO_MEMORY, PortNameLength);
72  if (PortName.Buffer == NULL)
73  {
75  }
76 
77  /* Create the name */
78  RtlAppendUnicodeToString(&PortName, ObjectDirectory );
81 
82  /* Create a section for the port memory */
83  CsrSectionViewSize.QuadPart = CSR_CSRSS_SECTION_SIZE;
84  Status = NtCreateSection(&CsrSectionHandle,
86  NULL,
87  &CsrSectionViewSize,
90  NULL);
91  if (!NT_SUCCESS(Status))
92  {
93  DPRINT1("Failure allocating CSR Section\n");
94  return Status;
95  }
96 
97  /* Set up the port view structures to match them with the section */
98  LpcWrite.Length = sizeof(PORT_VIEW);
99  LpcWrite.SectionHandle = CsrSectionHandle;
100  LpcWrite.SectionOffset = 0;
101  LpcWrite.ViewSize = CsrSectionViewSize.u.LowPart;
102  LpcWrite.ViewBase = 0;
103  LpcWrite.ViewRemoteBase = 0;
104  LpcRead.Length = sizeof(REMOTE_PORT_VIEW);
105  LpcRead.ViewSize = 0;
106  LpcRead.ViewBase = 0;
107 
108  /* Setup the QoS */
111  SecurityQos.EffectiveOnly = TRUE;
112 
113  /* Setup the connection info */
114  ConnectionInfo.DebugFlags = 0;
115 
116  /* Create a SID for us */
118  1,
120  0,
121  0,
122  0,
123  0,
124  0,
125  0,
126  0,
127  &SystemSid);
128  if (!NT_SUCCESS(Status))
129  {
130  /* Failure */
131  DPRINT1("Couldn't allocate SID\n");
132  NtClose(CsrSectionHandle);
133  return Status;
134  }
135 
136  /* Connect to the port */
138  &PortName,
139  &SecurityQos,
140  &LpcWrite,
141  SystemSid,
142  &LpcRead,
143  NULL,
144  &ConnectionInfo,
145  &ConnectionInfoLength);
146  RtlFreeSid(SystemSid);
147  NtClose(CsrSectionHandle);
148  if (!NT_SUCCESS(Status))
149  {
150  /* Failure */
151  DPRINT1("Couldn't connect to CSR port\n");
152  return Status;
153  }
154 
155  /* Save the delta between the sections, for capture usage later */
157  (ULONG_PTR)LpcWrite.ViewBase;
158 
159  /* Save the Process */
160  CsrProcessId = ConnectionInfo.ServerProcessId;
161 
162  /* Save CSR Section data */
163  NtCurrentPeb()->ReadOnlySharedMemoryBase = ConnectionInfo.SharedSectionBase;
164  NtCurrentPeb()->ReadOnlySharedMemoryHeap = ConnectionInfo.SharedSectionHeap;
165  NtCurrentPeb()->ReadOnlyStaticServerData = ConnectionInfo.SharedStaticServerData;
166 
167  /* Create the port heap */
169  LpcWrite.ViewBase,
170  LpcWrite.ViewSize,
171  PAGE_SIZE,
172  0,
173  0);
174  if (CsrPortHeap == NULL)
175  {
176  /* Failure */
177  DPRINT1("Couldn't create heap for CSR port\n");
179  CsrApiPort = NULL;
181  }
182 
183  /* Return success */
184  return STATUS_SUCCESS;
185 }
186 
187 /*
188  * @implemented
189  */
190 NTSTATUS
191 NTAPI
193  IN ULONG ServerId,
194  IN PVOID ConnectionInfo,
195  IN OUT PULONG ConnectionInfoSize,
196  OUT PBOOLEAN ServerToServerCall)
197 {
199  PIMAGE_NT_HEADERS NtHeader;
200  UNICODE_STRING CsrSrvName;
201  HANDLE hCsrSrv;
202  ANSI_STRING CsrServerRoutineName;
203  CSR_API_MESSAGE ApiMessage;
204  PCSR_CLIENT_CONNECT ClientConnect = &ApiMessage.Data.CsrClientConnect;
205  PCSR_CAPTURE_BUFFER CaptureBuffer;
206 
207  DPRINT("CsrClientConnectToServer: %lx %p\n", ServerId, ConnectionInfo);
208 
209  /* Validate the Connection Info */
210  if (ConnectionInfo && (!ConnectionInfoSize || !*ConnectionInfoSize))
211  {
212  DPRINT1("Connection info given, but no length\n");
214  }
215 
216  /* Check if we're inside a CSR Process */
217  if (InsideCsrProcess)
218  {
219  /* Tell the client that we're already inside CSR */
220  if (ServerToServerCall) *ServerToServerCall = TRUE;
221  return STATUS_SUCCESS;
222  }
223 
224  /*
225  * We might be in a CSR Process but not know it, if this is the first call.
226  * So let's find out.
227  */
228  if (!(NtHeader = RtlImageNtHeader(NtCurrentPeb()->ImageBaseAddress)))
229  {
230  /* The image isn't valid */
231  DPRINT1("Invalid image\n");
233  }
235 
236  /* Now we can check if we are inside or not */
237  if (InsideCsrProcess)
238  {
239  /* We're inside, so let's find csrsrv */
240  DPRINT("Next-GEN CSRSS support\n");
241  RtlInitUnicodeString(&CsrSrvName, L"csrsrv");
243  NULL,
244  &CsrSrvName,
245  &hCsrSrv);
246 
247  /* Now get the Server to Server routine */
248  RtlInitAnsiString(&CsrServerRoutineName, "CsrCallServerFromServer");
249  Status = LdrGetProcedureAddress(hCsrSrv,
250  &CsrServerRoutineName,
251  0L,
253 
254  /* Use the local heap as port heap */
255  CsrPortHeap = RtlGetProcessHeap();
256 
257  /* Tell the caller we're inside the server */
258  if (ServerToServerCall) *ServerToServerCall = InsideCsrProcess;
259  return STATUS_SUCCESS;
260  }
261 
262  /* Now check if connection info is given */
263  if (ConnectionInfo)
264  {
265  /* Well, we're definitely in a client now */
267 
268  /* Do we have a connection to CSR yet? */
269  if (!CsrApiPort)
270  {
271  /* No, set it up now */
272  Status = CsrpConnectToServer(ObjectDirectory);
273  if (!NT_SUCCESS(Status))
274  {
275  /* Failed */
276  DPRINT1("Failure to connect to CSR\n");
277  return Status;
278  }
279  }
280 
281  /* Setup the connect message header */
282  ClientConnect->ServerId = ServerId;
283  ClientConnect->ConnectionInfoSize = *ConnectionInfoSize;
284 
285  /* Setup a buffer for the connection info */
286  CaptureBuffer = CsrAllocateCaptureBuffer(1, ClientConnect->ConnectionInfoSize);
287  if (CaptureBuffer == NULL)
288  {
290  }
291 
292  /* Capture the connection info data */
293  CsrCaptureMessageBuffer(CaptureBuffer,
294  ConnectionInfo,
295  ClientConnect->ConnectionInfoSize,
296  &ClientConnect->ConnectionInfo);
297 
298  /* Return the allocated length */
299  *ConnectionInfoSize = ClientConnect->ConnectionInfoSize;
300 
301  /* Call CSR */
302  Status = CsrClientCallServer(&ApiMessage,
303  CaptureBuffer,
305  sizeof(CSR_CLIENT_CONNECT));
306 
307  /* Copy the updated connection info data back into the user buffer */
308  RtlMoveMemory(ConnectionInfo,
309  ClientConnect->ConnectionInfo,
310  *ConnectionInfoSize);
311 
312  /* Free the capture buffer */
313  CsrFreeCaptureBuffer(CaptureBuffer);
314  }
315  else
316  {
317  /* No connection info, just return */
319  }
320 
321  /* Let the caller know if this was server to server */
322  DPRINT("Status was: 0x%lx. Are we in server: 0x%x\n", Status, InsideCsrProcess);
323  if (ServerToServerCall) *ServerToServerCall = InsideCsrProcess;
324 
325  return Status;
326 }
327 
328 #if 0
329 //
330 // Structures can be padded at the end, causing the size of the entire structure
331 // minus the size of the last field, not to be equal to the offset of the last
332 // field.
333 //
334 typedef struct _TEST_EMBEDDED
335 {
336  ULONG One;
337  ULONG Two;
338  ULONG Three;
339 } TEST_EMBEDDED;
340 
341 typedef struct _TEST
342 {
343  PORT_MESSAGE h;
344  TEST_EMBEDDED Three;
345 } TEST;
346 
347 C_ASSERT(sizeof(PORT_MESSAGE) == 0x18);
348 C_ASSERT(FIELD_OFFSET(TEST, Three) == 0x18);
349 C_ASSERT(sizeof(TEST_EMBEDDED) == 0xC);
350 
351 C_ASSERT(sizeof(TEST) != (sizeof(TEST_EMBEDDED) + sizeof(PORT_MESSAGE)));
352 C_ASSERT((sizeof(TEST) - sizeof(TEST_EMBEDDED)) != FIELD_OFFSET(TEST, Three));
353 #endif
354 
355 /*
356  * @implemented
357  */
358 NTSTATUS
359 NTAPI
361  IN OUT PCSR_CAPTURE_BUFFER CaptureBuffer OPTIONAL,
362  IN CSR_API_NUMBER ApiNumber,
364 {
366  ULONG PointerCount;
367  PULONG_PTR OffsetPointer;
368 
369  /* Fill out the Port Message Header */
370  ApiMessage->Header.u2.ZeroInit = 0;
371  ApiMessage->Header.u1.s1.TotalLength = DataLength +
372  sizeof(CSR_API_MESSAGE) - sizeof(ApiMessage->Data); // FIELD_OFFSET(CSR_API_MESSAGE, Data) + DataLength;
373  ApiMessage->Header.u1.s1.DataLength = DataLength +
374  FIELD_OFFSET(CSR_API_MESSAGE, Data) - sizeof(ApiMessage->Header); // ApiMessage->Header.u1.s1.TotalLength - sizeof(PORT_MESSAGE);
375 
376  /* Fill out the CSR Header */
377  ApiMessage->ApiNumber = ApiNumber;
378  ApiMessage->CsrCaptureData = NULL;
379 
380  DPRINT("API: %lx, u1.s1.DataLength: %x, u1.s1.TotalLength: %x\n",
381  ApiNumber,
382  ApiMessage->Header.u1.s1.DataLength,
383  ApiMessage->Header.u1.s1.TotalLength);
384 
385  /* Check if we are already inside a CSR Server */
386  if (!InsideCsrProcess)
387  {
388  /* Check if we got a Capture Buffer */
389  if (CaptureBuffer)
390  {
391  /*
392  * We have to convert from our local (client) view
393  * to the remote (server) view.
394  */
395  ApiMessage->CsrCaptureData = (PCSR_CAPTURE_BUFFER)
396  ((ULONG_PTR)CaptureBuffer + CsrPortMemoryDelta);
397 
398  /* Lock the buffer. */
399  CaptureBuffer->BufferEnd = NULL;
400 
401  /*
402  * Each client pointer inside the CSR message is converted into
403  * a server pointer, and each pointer to these message pointers
404  * is converted into an offset.
405  */
406  PointerCount = CaptureBuffer->PointerCount;
407  OffsetPointer = CaptureBuffer->PointerOffsetsArray;
408  while (PointerCount--)
409  {
410  if (*OffsetPointer != 0)
411  {
412  *(PULONG_PTR)*OffsetPointer += CsrPortMemoryDelta;
413  *OffsetPointer -= (ULONG_PTR)ApiMessage;
414  }
415  ++OffsetPointer;
416  }
417  }
418 
419  /* Send the LPC Message */
421  &ApiMessage->Header,
422  &ApiMessage->Header);
423 
424  /* Check if we got a Capture Buffer */
425  if (CaptureBuffer)
426  {
427  /*
428  * We have to convert back from the remote (server) view
429  * to our local (client) view.
430  */
431  ApiMessage->CsrCaptureData = (PCSR_CAPTURE_BUFFER)
432  ((ULONG_PTR)ApiMessage->CsrCaptureData - CsrPortMemoryDelta);
433 
434  /*
435  * Convert back the offsets into pointers to CSR message
436  * pointers, and convert back these message server pointers
437  * into client pointers.
438  */
439  PointerCount = CaptureBuffer->PointerCount;
440  OffsetPointer = CaptureBuffer->PointerOffsetsArray;
441  while (PointerCount--)
442  {
443  if (*OffsetPointer != 0)
444  {
445  *OffsetPointer += (ULONG_PTR)ApiMessage;
446  *(PULONG_PTR)*OffsetPointer -= CsrPortMemoryDelta;
447  }
448  ++OffsetPointer;
449  }
450  }
451 
452  /* Check for success */
453  if (!NT_SUCCESS(Status))
454  {
455  /* We failed. Overwrite the return value with the failure. */
456  DPRINT1("LPC Failed: %lx\n", Status);
457  ApiMessage->Status = Status;
458  }
459  }
460  else
461  {
462  /* This is a server-to-server call. Save our CID and do a direct call. */
463  DPRINT("Next gen server-to-server call\n");
464 
465  /* We check this equality inside CsrValidateMessageBuffer */
466  ApiMessage->Header.ClientId = NtCurrentTeb()->ClientId;
467 
468  Status = CsrServerApiRoutine(&ApiMessage->Header,
469  &ApiMessage->Header);
470 
471  /* Check for success */
472  if (!NT_SUCCESS(Status))
473  {
474  /* We failed. Overwrite the return value with the failure. */
475  ApiMessage->Status = Status;
476  }
477  }
478 
479  /* Return the CSR Result */
480  DPRINT("Got back: 0x%lx\n", ApiMessage->Status);
481  return ApiMessage->Status;
482 }
483 
484 /*
485  * @implemented
486  */
487 HANDLE
488 NTAPI
490 {
491  return CsrProcessId;
492 }
493 
494 /* EOF */
ULONG CSR_API_NUMBER
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