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1 | /** @file\r | |
2 | Handle TPM 2.0 physical presence requests from OS.\r | |
3 | \r | |
4 | This library will handle TPM 2.0 physical presence request from OS.\r | |
5 | \r | |
6 | Caution: This module requires additional review when modified.\r | |
7 | This driver will have external input - variable.\r | |
8 | This external input must be validated carefully to avoid security issue.\r | |
9 | \r | |
10 | Tcg2PhysicalPresenceLibSubmitRequestToPreOSFunction() and Tcg2PhysicalPresenceLibGetUserConfirmationStatusFunction()\r | |
11 | will receive untrusted input and do validation.\r | |
12 | \r | |
13 | Copyright (c) 2015 - 2020, Intel Corporation. All rights reserved.<BR>\r | |
14 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
15 | \r | |
16 | **/\r | |
17 | \r | |
18 | #include <PiMm.h>\r | |
19 | \r | |
20 | #include <Guid/Tcg2PhysicalPresenceData.h>\r | |
21 | \r | |
22 | #include <Protocol/SmmVariable.h>\r | |
23 | \r | |
24 | #include <Library/BaseLib.h>\r | |
25 | #include <Library/DebugLib.h>\r | |
26 | #include <Library/BaseMemoryLib.h>\r | |
27 | #include <Library/Tcg2PpVendorLib.h>\r | |
28 | #include <Library/MmServicesTableLib.h>\r | |
29 | \r | |
30 | #define PP_INF_VERSION_1_2 "1.2"\r | |
31 | \r | |
32 | EFI_SMM_VARIABLE_PROTOCOL *mTcg2PpSmmVariable;\r | |
33 | BOOLEAN mIsTcg2PPVerLowerThan_1_3 = FALSE;\r | |
34 | UINT32 mTcg2PhysicalPresenceFlags;\r | |
35 | \r | |
36 | /**\r | |
37 | The handler for TPM physical presence function:\r | |
38 | Return TPM Operation Response to OS Environment.\r | |
39 | \r | |
40 | This API should be invoked in OS runtime phase to interface with ACPI method.\r | |
41 | \r | |
42 | @param[out] MostRecentRequest Most recent operation request.\r | |
43 | @param[out] Response Response to the most recent operation request.\r | |
44 | \r | |
45 | @return Return Code for Return TPM Operation Response to OS Environment.\r | |
46 | **/\r | |
47 | UINT32\r | |
48 | EFIAPI\r | |
49 | Tcg2PhysicalPresenceLibReturnOperationResponseToOsFunction (\r | |
50 | OUT UINT32 *MostRecentRequest,\r | |
51 | OUT UINT32 *Response\r | |
52 | )\r | |
53 | {\r | |
54 | EFI_STATUS Status;\r | |
55 | UINTN DataSize;\r | |
56 | EFI_TCG2_PHYSICAL_PRESENCE PpData;\r | |
57 | \r | |
58 | DEBUG ((DEBUG_INFO, "[TPM2] ReturnOperationResponseToOsFunction\n"));\r | |
59 | \r | |
60 | //\r | |
61 | // Get the Physical Presence variable\r | |
62 | //\r | |
63 | DataSize = sizeof (EFI_TCG2_PHYSICAL_PRESENCE);\r | |
64 | Status = mTcg2PpSmmVariable->SmmGetVariable (\r | |
65 | TCG2_PHYSICAL_PRESENCE_VARIABLE,\r | |
66 | &gEfiTcg2PhysicalPresenceGuid,\r | |
67 | NULL,\r | |
68 | &DataSize,\r | |
69 | &PpData\r | |
70 | );\r | |
71 | if (EFI_ERROR (Status)) {\r | |
72 | *MostRecentRequest = 0;\r | |
73 | *Response = 0;\r | |
74 | DEBUG ((DEBUG_ERROR, "[TPM2] Get PP variable failure! Status = %r\n", Status));\r | |
75 | return TCG_PP_RETURN_TPM_OPERATION_RESPONSE_FAILURE;\r | |
76 | }\r | |
77 | \r | |
78 | *MostRecentRequest = PpData.LastPPRequest;\r | |
79 | *Response = PpData.PPResponse;\r | |
80 | \r | |
81 | return TCG_PP_RETURN_TPM_OPERATION_RESPONSE_SUCCESS;\r | |
82 | }\r | |
83 | \r | |
84 | /**\r | |
85 | The handler for TPM physical presence function:\r | |
86 | Submit TPM Operation Request to Pre-OS Environment and\r | |
87 | Submit TPM Operation Request to Pre-OS Environment 2.\r | |
88 | \r | |
89 | This API should be invoked in OS runtime phase to interface with ACPI method.\r | |
90 | \r | |
91 | Caution: This function may receive untrusted input.\r | |
92 | \r | |
93 | @param[in, out] Pointer to OperationRequest TPM physical presence operation request.\r | |
94 | @param[in, out] Pointer to RequestParameter TPM physical presence operation request parameter.\r | |
95 | \r | |
96 | @return Return Code for Submit TPM Operation Request to Pre-OS Environment and\r | |
97 | Submit TPM Operation Request to Pre-OS Environment 2.\r | |
98 | **/\r | |
99 | UINT32\r | |
100 | Tcg2PhysicalPresenceLibSubmitRequestToPreOSFunctionEx (\r | |
101 | IN OUT UINT32 *OperationRequest,\r | |
102 | IN OUT UINT32 *RequestParameter\r | |
103 | )\r | |
104 | {\r | |
105 | EFI_STATUS Status;\r | |
106 | UINT32 ReturnCode;\r | |
107 | UINTN DataSize;\r | |
108 | EFI_TCG2_PHYSICAL_PRESENCE PpData;\r | |
109 | EFI_TCG2_PHYSICAL_PRESENCE_FLAGS Flags;\r | |
110 | \r | |
111 | DEBUG ((DEBUG_INFO, "[TPM2] SubmitRequestToPreOSFunction, Request = %x, %x\n", *OperationRequest, *RequestParameter));\r | |
112 | ReturnCode = TCG_PP_SUBMIT_REQUEST_TO_PREOS_SUCCESS;\r | |
113 | \r | |
114 | //\r | |
115 | // Get the Physical Presence variable\r | |
116 | //\r | |
117 | DataSize = sizeof (EFI_TCG2_PHYSICAL_PRESENCE);\r | |
118 | Status = mTcg2PpSmmVariable->SmmGetVariable (\r | |
119 | TCG2_PHYSICAL_PRESENCE_VARIABLE,\r | |
120 | &gEfiTcg2PhysicalPresenceGuid,\r | |
121 | NULL,\r | |
122 | &DataSize,\r | |
123 | &PpData\r | |
124 | );\r | |
125 | if (EFI_ERROR (Status)) {\r | |
126 | DEBUG ((DEBUG_ERROR, "[TPM2] Get PP variable failure! Status = %r\n", Status));\r | |
127 | ReturnCode = TCG_PP_SUBMIT_REQUEST_TO_PREOS_GENERAL_FAILURE;\r | |
128 | goto EXIT;\r | |
129 | }\r | |
130 | \r | |
131 | if ((*OperationRequest > TCG2_PHYSICAL_PRESENCE_NO_ACTION_MAX) &&\r | |
132 | (*OperationRequest < TCG2_PHYSICAL_PRESENCE_STORAGE_MANAGEMENT_BEGIN))\r | |
133 | {\r | |
134 | ReturnCode = TCG_PP_SUBMIT_REQUEST_TO_PREOS_NOT_IMPLEMENTED;\r | |
135 | goto EXIT;\r | |
136 | }\r | |
137 | \r | |
138 | if ((PpData.PPRequest != *OperationRequest) ||\r | |
139 | (PpData.PPRequestParameter != *RequestParameter))\r | |
140 | {\r | |
141 | PpData.PPRequest = (UINT8)*OperationRequest;\r | |
142 | PpData.PPRequestParameter = *RequestParameter;\r | |
143 | DataSize = sizeof (EFI_TCG2_PHYSICAL_PRESENCE);\r | |
144 | Status = mTcg2PpSmmVariable->SmmSetVariable (\r | |
145 | TCG2_PHYSICAL_PRESENCE_VARIABLE,\r | |
146 | &gEfiTcg2PhysicalPresenceGuid,\r | |
147 | EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,\r | |
148 | DataSize,\r | |
149 | &PpData\r | |
150 | );\r | |
151 | if (EFI_ERROR (Status)) {\r | |
152 | DEBUG ((DEBUG_ERROR, "[TPM2] Set PP variable failure! Status = %r\n", Status));\r | |
153 | ReturnCode = TCG_PP_SUBMIT_REQUEST_TO_PREOS_GENERAL_FAILURE;\r | |
154 | goto EXIT;\r | |
155 | }\r | |
156 | }\r | |
157 | \r | |
158 | if (*OperationRequest >= TCG2_PHYSICAL_PRESENCE_VENDOR_SPECIFIC_OPERATION) {\r | |
159 | DataSize = sizeof (EFI_TCG2_PHYSICAL_PRESENCE_FLAGS);\r | |
160 | Status = mTcg2PpSmmVariable->SmmGetVariable (\r | |
161 | TCG2_PHYSICAL_PRESENCE_FLAGS_VARIABLE,\r | |
162 | &gEfiTcg2PhysicalPresenceGuid,\r | |
163 | NULL,\r | |
164 | &DataSize,\r | |
165 | &Flags\r | |
166 | );\r | |
167 | if (EFI_ERROR (Status)) {\r | |
168 | Flags.PPFlags = mTcg2PhysicalPresenceFlags;\r | |
169 | }\r | |
170 | \r | |
171 | ReturnCode = Tcg2PpVendorLibSubmitRequestToPreOSFunction (*OperationRequest, Flags.PPFlags, *RequestParameter);\r | |
172 | }\r | |
173 | \r | |
174 | EXIT:\r | |
175 | //\r | |
176 | // Sync PPRQ/PPRM from PP Variable if PP submission fails\r | |
177 | //\r | |
178 | if (ReturnCode != TCG_PP_SUBMIT_REQUEST_TO_PREOS_SUCCESS) {\r | |
179 | DEBUG ((DEBUG_ERROR, "[TPM2] Submit PP Request failure! Sync PPRQ/PPRM with PP variable. Status = %r\n", Status));\r | |
180 | DataSize = sizeof (EFI_TCG2_PHYSICAL_PRESENCE);\r | |
181 | ZeroMem (&PpData, DataSize);\r | |
182 | Status = mTcg2PpSmmVariable->SmmGetVariable (\r | |
183 | TCG2_PHYSICAL_PRESENCE_VARIABLE,\r | |
184 | &gEfiTcg2PhysicalPresenceGuid,\r | |
185 | NULL,\r | |
186 | &DataSize,\r | |
187 | &PpData\r | |
188 | );\r | |
189 | *OperationRequest = (UINT32)PpData.PPRequest;\r | |
190 | *RequestParameter = PpData.PPRequestParameter;\r | |
191 | }\r | |
192 | \r | |
193 | return ReturnCode;\r | |
194 | }\r | |
195 | \r | |
196 | /**\r | |
197 | The handler for TPM physical presence function:\r | |
198 | Submit TPM Operation Request to Pre-OS Environment and\r | |
199 | Submit TPM Operation Request to Pre-OS Environment 2.\r | |
200 | \r | |
201 | This API should be invoked in OS runtime phase to interface with ACPI method.\r | |
202 | \r | |
203 | Caution: This function may receive untrusted input.\r | |
204 | \r | |
205 | @param[in] OperationRequest TPM physical presence operation request.\r | |
206 | @param[in] RequestParameter TPM physical presence operation request parameter.\r | |
207 | \r | |
208 | @return Return Code for Submit TPM Operation Request to Pre-OS Environment and\r | |
209 | Submit TPM Operation Request to Pre-OS Environment 2.\r | |
210 | **/\r | |
211 | UINT32\r | |
212 | EFIAPI\r | |
213 | Tcg2PhysicalPresenceLibSubmitRequestToPreOSFunction (\r | |
214 | IN UINT32 OperationRequest,\r | |
215 | IN UINT32 RequestParameter\r | |
216 | )\r | |
217 | {\r | |
218 | UINT32 TempOperationRequest;\r | |
219 | UINT32 TempRequestParameter;\r | |
220 | \r | |
221 | TempOperationRequest = OperationRequest;\r | |
222 | TempRequestParameter = RequestParameter;\r | |
223 | \r | |
224 | return Tcg2PhysicalPresenceLibSubmitRequestToPreOSFunctionEx (&TempOperationRequest, &TempRequestParameter);\r | |
225 | }\r | |
226 | \r | |
227 | /**\r | |
228 | The handler for TPM physical presence function:\r | |
229 | Get User Confirmation Status for Operation.\r | |
230 | \r | |
231 | This API should be invoked in OS runtime phase to interface with ACPI method.\r | |
232 | \r | |
233 | Caution: This function may receive untrusted input.\r | |
234 | \r | |
235 | @param[in] OperationRequest TPM physical presence operation request.\r | |
236 | \r | |
237 | @return Return Code for Get User Confirmation Status for Operation.\r | |
238 | **/\r | |
239 | UINT32\r | |
240 | EFIAPI\r | |
241 | Tcg2PhysicalPresenceLibGetUserConfirmationStatusFunction (\r | |
242 | IN UINT32 OperationRequest\r | |
243 | )\r | |
244 | {\r | |
245 | EFI_STATUS Status;\r | |
246 | UINTN DataSize;\r | |
247 | EFI_TCG2_PHYSICAL_PRESENCE PpData;\r | |
248 | EFI_TCG2_PHYSICAL_PRESENCE_FLAGS Flags;\r | |
249 | BOOLEAN RequestConfirmed;\r | |
250 | \r | |
251 | DEBUG ((DEBUG_INFO, "[TPM2] GetUserConfirmationStatusFunction, Request = %x\n", OperationRequest));\r | |
252 | \r | |
253 | //\r | |
254 | // Get the Physical Presence variable\r | |
255 | //\r | |
256 | DataSize = sizeof (EFI_TCG2_PHYSICAL_PRESENCE);\r | |
257 | Status = mTcg2PpSmmVariable->SmmGetVariable (\r | |
258 | TCG2_PHYSICAL_PRESENCE_VARIABLE,\r | |
259 | &gEfiTcg2PhysicalPresenceGuid,\r | |
260 | NULL,\r | |
261 | &DataSize,\r | |
262 | &PpData\r | |
263 | );\r | |
264 | if (EFI_ERROR (Status)) {\r | |
265 | DEBUG ((DEBUG_ERROR, "[TPM2] Get PP variable failure! Status = %r\n", Status));\r | |
266 | return TCG_PP_GET_USER_CONFIRMATION_BLOCKED_BY_BIOS_CONFIGURATION;\r | |
267 | }\r | |
268 | \r | |
269 | //\r | |
270 | // Get the Physical Presence flags\r | |
271 | //\r | |
272 | DataSize = sizeof (EFI_TCG2_PHYSICAL_PRESENCE_FLAGS);\r | |
273 | Status = mTcg2PpSmmVariable->SmmGetVariable (\r | |
274 | TCG2_PHYSICAL_PRESENCE_FLAGS_VARIABLE,\r | |
275 | &gEfiTcg2PhysicalPresenceGuid,\r | |
276 | NULL,\r | |
277 | &DataSize,\r | |
278 | &Flags\r | |
279 | );\r | |
280 | if (EFI_ERROR (Status)) {\r | |
281 | DEBUG ((DEBUG_ERROR, "[TPM2] Get PP flags failure! Status = %r\n", Status));\r | |
282 | return TCG_PP_GET_USER_CONFIRMATION_BLOCKED_BY_BIOS_CONFIGURATION;\r | |
283 | }\r | |
284 | \r | |
285 | RequestConfirmed = FALSE;\r | |
286 | \r | |
287 | switch (OperationRequest) {\r | |
288 | case TCG2_PHYSICAL_PRESENCE_CLEAR:\r | |
289 | case TCG2_PHYSICAL_PRESENCE_ENABLE_CLEAR:\r | |
290 | case TCG2_PHYSICAL_PRESENCE_ENABLE_CLEAR_2:\r | |
291 | case TCG2_PHYSICAL_PRESENCE_ENABLE_CLEAR_3:\r | |
292 | if ((Flags.PPFlags & TCG2_BIOS_TPM_MANAGEMENT_FLAG_PP_REQUIRED_FOR_CLEAR) == 0) {\r | |
293 | RequestConfirmed = TRUE;\r | |
294 | }\r | |
295 | \r | |
296 | break;\r | |
297 | \r | |
298 | case TCG2_PHYSICAL_PRESENCE_NO_ACTION:\r | |
299 | case TCG2_PHYSICAL_PRESENCE_SET_PP_REQUIRED_FOR_CLEAR_TRUE:\r | |
300 | RequestConfirmed = TRUE;\r | |
301 | break;\r | |
302 | \r | |
303 | case TCG2_PHYSICAL_PRESENCE_SET_PP_REQUIRED_FOR_CLEAR_FALSE:\r | |
304 | break;\r | |
305 | \r | |
306 | case TCG2_PHYSICAL_PRESENCE_SET_PCR_BANKS:\r | |
307 | if ((Flags.PPFlags & TCG2_BIOS_TPM_MANAGEMENT_FLAG_PP_REQUIRED_FOR_CHANGE_PCRS) == 0) {\r | |
308 | RequestConfirmed = TRUE;\r | |
309 | }\r | |
310 | \r | |
311 | break;\r | |
312 | \r | |
313 | case TCG2_PHYSICAL_PRESENCE_CHANGE_EPS:\r | |
314 | if ((Flags.PPFlags & TCG2_BIOS_TPM_MANAGEMENT_FLAG_PP_REQUIRED_FOR_CHANGE_EPS) == 0) {\r | |
315 | RequestConfirmed = TRUE;\r | |
316 | }\r | |
317 | \r | |
318 | break;\r | |
319 | \r | |
320 | case TCG2_PHYSICAL_PRESENCE_LOG_ALL_DIGESTS:\r | |
321 | RequestConfirmed = TRUE;\r | |
322 | break;\r | |
323 | \r | |
324 | case TCG2_PHYSICAL_PRESENCE_ENABLE_BLOCK_SID:\r | |
325 | if ((Flags.PPFlags & TCG2_BIOS_STORAGE_MANAGEMENT_FLAG_PP_REQUIRED_FOR_ENABLE_BLOCK_SID) == 0) {\r | |
326 | RequestConfirmed = TRUE;\r | |
327 | }\r | |
328 | \r | |
329 | break;\r | |
330 | \r | |
331 | case TCG2_PHYSICAL_PRESENCE_DISABLE_BLOCK_SID:\r | |
332 | if ((Flags.PPFlags & TCG2_BIOS_STORAGE_MANAGEMENT_FLAG_PP_REQUIRED_FOR_DISABLE_BLOCK_SID) == 0) {\r | |
333 | RequestConfirmed = TRUE;\r | |
334 | }\r | |
335 | \r | |
336 | break;\r | |
337 | \r | |
338 | case TCG2_PHYSICAL_PRESENCE_SET_PP_REQUIRED_FOR_ENABLE_BLOCK_SID_FUNC_TRUE:\r | |
339 | case TCG2_PHYSICAL_PRESENCE_SET_PP_REQUIRED_FOR_DISABLE_BLOCK_SID_FUNC_TRUE:\r | |
340 | RequestConfirmed = TRUE;\r | |
341 | break;\r | |
342 | \r | |
343 | case TCG2_PHYSICAL_PRESENCE_SET_PP_REQUIRED_FOR_ENABLE_BLOCK_SID_FUNC_FALSE:\r | |
344 | case TCG2_PHYSICAL_PRESENCE_SET_PP_REQUIRED_FOR_DISABLE_BLOCK_SID_FUNC_FALSE:\r | |
345 | break;\r | |
346 | \r | |
347 | default:\r | |
348 | if (!mIsTcg2PPVerLowerThan_1_3) {\r | |
349 | if (OperationRequest < TCG2_PHYSICAL_PRESENCE_VENDOR_SPECIFIC_OPERATION) {\r | |
350 | //\r | |
351 | // TCG2 PP1.3 spec defined operations that are reserved or un-implemented\r | |
352 | //\r | |
353 | return TCG_PP_GET_USER_CONFIRMATION_NOT_IMPLEMENTED;\r | |
354 | }\r | |
355 | } else {\r | |
356 | //\r | |
357 | // TCG PP lower than 1.3. (1.0, 1.1, 1.2)\r | |
358 | //\r | |
359 | if (OperationRequest <= TCG2_PHYSICAL_PRESENCE_NO_ACTION_MAX) {\r | |
360 | RequestConfirmed = TRUE;\r | |
361 | } else if (OperationRequest < TCG2_PHYSICAL_PRESENCE_VENDOR_SPECIFIC_OPERATION) {\r | |
362 | return TCG_PP_GET_USER_CONFIRMATION_NOT_IMPLEMENTED;\r | |
363 | }\r | |
364 | }\r | |
365 | \r | |
366 | break;\r | |
367 | }\r | |
368 | \r | |
369 | if (OperationRequest >= TCG2_PHYSICAL_PRESENCE_VENDOR_SPECIFIC_OPERATION) {\r | |
370 | return Tcg2PpVendorLibGetUserConfirmationStatusFunction (OperationRequest, Flags.PPFlags);\r | |
371 | }\r | |
372 | \r | |
373 | if (RequestConfirmed) {\r | |
374 | return TCG_PP_GET_USER_CONFIRMATION_ALLOWED_AND_PPUSER_NOT_REQUIRED;\r | |
375 | } else {\r | |
376 | return TCG_PP_GET_USER_CONFIRMATION_ALLOWED_AND_PPUSER_REQUIRED;\r | |
377 | }\r | |
378 | }\r | |
379 | \r | |
380 | /**\r | |
381 | The constructor function locates SmmVariable protocol.\r | |
382 | \r | |
383 | It will ASSERT() if that operation fails and it will always return EFI_SUCCESS.\r | |
384 | \r | |
385 | @retval EFI_SUCCESS The constructor successfully added string package.\r | |
386 | @retval Other value The constructor can't add string package.\r | |
387 | **/\r | |
388 | EFI_STATUS\r | |
389 | Tcg2PhysicalPresenceLibCommonConstructor (\r | |
390 | VOID\r | |
391 | )\r | |
392 | {\r | |
393 | EFI_STATUS Status;\r | |
394 | \r | |
395 | if (AsciiStrnCmp (PP_INF_VERSION_1_2, (CHAR8 *)PcdGetPtr (PcdTcgPhysicalPresenceInterfaceVer), sizeof (PP_INF_VERSION_1_2) - 1) >= 0) {\r | |
396 | mIsTcg2PPVerLowerThan_1_3 = TRUE;\r | |
397 | }\r | |
398 | \r | |
399 | //\r | |
400 | // Locate SmmVariableProtocol.\r | |
401 | //\r | |
402 | Status = gMmst->MmLocateProtocol (&gEfiSmmVariableProtocolGuid, NULL, (VOID **)&mTcg2PpSmmVariable);\r | |
403 | ASSERT_EFI_ERROR (Status);\r | |
404 | \r | |
405 | mTcg2PhysicalPresenceFlags = PcdGet32 (PcdTcg2PhysicalPresenceFlags);\r | |
406 | \r | |
407 | return EFI_SUCCESS;\r | |
408 | }\r |