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bb806a6e GB |
1 | /** @file\r |
2 | This library provides helper functions to set/clear Secure Boot\r | |
3 | keys and databases.\r | |
4 | \r | |
5 | Copyright (c) 2011 - 2018, Intel Corporation. All rights reserved.<BR>\r | |
6 | (C) Copyright 2018 Hewlett Packard Enterprise Development LP<BR>\r | |
7 | Copyright (c) 2021, ARM Ltd. All rights reserved.<BR>\r | |
8 | Copyright (c) 2021, Semihalf All rights reserved.<BR>\r | |
56c717aa | 9 | Copyright (c) Microsoft Corporation.\r |
bb806a6e GB |
10 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
11 | **/\r | |
56c717aa | 12 | #include <Uefi.h>\r |
bb806a6e GB |
13 | #include <Guid/GlobalVariable.h>\r |
14 | #include <Guid/AuthenticatedVariableFormat.h>\r | |
15 | #include <Guid/ImageAuthentication.h>\r | |
16 | #include <Library/BaseCryptLib.h>\r | |
17 | #include <Library/BaseLib.h>\r | |
18 | #include <Library/BaseMemoryLib.h>\r | |
19 | #include <Library/DebugLib.h>\r | |
20 | #include <Library/UefiLib.h>\r | |
21 | #include <Library/MemoryAllocationLib.h>\r | |
22 | #include <Library/UefiRuntimeServicesTableLib.h>\r | |
23 | #include <Library/SecureBootVariableLib.h>\r | |
24 | #include "Library/DxeServicesLib.h"\r | |
25 | \r | |
56c717aa KQ |
26 | // This time can be used when deleting variables, as it should be greater than any variable time.\r |
27 | EFI_TIME mMaxTimestamp = {\r | |
28 | 0xFFFF, // Year\r | |
29 | 0xFF, // Month\r | |
30 | 0xFF, // Day\r | |
31 | 0xFF, // Hour\r | |
32 | 0xFF, // Minute\r | |
33 | 0xFF, // Second\r | |
34 | 0x00,\r | |
35 | 0x00000000, // Nanosecond\r | |
36 | 0,\r | |
37 | 0,\r | |
38 | 0x00\r | |
39 | };\r | |
40 | \r | |
bb806a6e GB |
41 | /** Creates EFI Signature List structure.\r |
42 | \r | |
43 | @param[in] Data A pointer to signature data.\r | |
44 | @param[in] Size Size of signature data.\r | |
45 | @param[out] SigList Created Signature List.\r | |
46 | \r | |
47 | @retval EFI_SUCCESS Signature List was created successfully.\r | |
48 | @retval EFI_OUT_OF_RESOURCES Failed to allocate memory.\r | |
49 | **/\r | |
50 | STATIC\r | |
51 | EFI_STATUS\r | |
52 | CreateSigList (\r | |
c411b485 MK |
53 | IN VOID *Data,\r |
54 | IN UINTN Size,\r | |
55 | OUT EFI_SIGNATURE_LIST **SigList\r | |
bb806a6e GB |
56 | )\r |
57 | {\r | |
c411b485 MK |
58 | UINTN SigListSize;\r |
59 | EFI_SIGNATURE_LIST *TmpSigList;\r | |
60 | EFI_SIGNATURE_DATA *SigData;\r | |
bb806a6e GB |
61 | \r |
62 | //\r | |
63 | // Allocate data for Signature Database\r | |
64 | //\r | |
65 | SigListSize = sizeof (EFI_SIGNATURE_LIST) + sizeof (EFI_SIGNATURE_DATA) - 1 + Size;\r | |
c411b485 | 66 | TmpSigList = (EFI_SIGNATURE_LIST *)AllocateZeroPool (SigListSize);\r |
bb806a6e GB |
67 | if (TmpSigList == NULL) {\r |
68 | return EFI_OUT_OF_RESOURCES;\r | |
69 | }\r | |
70 | \r | |
71 | //\r | |
72 | // Only gEfiCertX509Guid type is supported\r | |
73 | //\r | |
c411b485 MK |
74 | TmpSigList->SignatureListSize = (UINT32)SigListSize;\r |
75 | TmpSigList->SignatureSize = (UINT32)(sizeof (EFI_SIGNATURE_DATA) - 1 + Size);\r | |
bb806a6e GB |
76 | TmpSigList->SignatureHeaderSize = 0;\r |
77 | CopyGuid (&TmpSigList->SignatureType, &gEfiCertX509Guid);\r | |
78 | \r | |
79 | //\r | |
80 | // Copy key data\r | |
81 | //\r | |
c411b485 | 82 | SigData = (EFI_SIGNATURE_DATA *)(TmpSigList + 1);\r |
bb806a6e GB |
83 | CopyGuid (&SigData->SignatureOwner, &gEfiGlobalVariableGuid);\r |
84 | CopyMem (&SigData->SignatureData[0], Data, Size);\r | |
85 | \r | |
86 | *SigList = TmpSigList;\r | |
87 | \r | |
88 | return EFI_SUCCESS;\r | |
89 | }\r | |
90 | \r | |
91 | /** Adds new signature list to signature database.\r | |
92 | \r | |
93 | @param[in] SigLists A pointer to signature database.\r | |
94 | @param[in] SigListAppend A signature list to be added.\r | |
95 | @param[out] *SigListOut Created signature database.\r | |
96 | @param[in, out] SigListsSize A size of created signature database.\r | |
97 | \r | |
98 | @retval EFI_SUCCESS Signature List was added successfully.\r | |
99 | @retval EFI_OUT_OF_RESOURCES Failed to allocate memory.\r | |
100 | **/\r | |
101 | STATIC\r | |
102 | EFI_STATUS\r | |
103 | ConcatenateSigList (\r | |
c411b485 MK |
104 | IN EFI_SIGNATURE_LIST *SigLists,\r |
105 | IN EFI_SIGNATURE_LIST *SigListAppend,\r | |
106 | OUT EFI_SIGNATURE_LIST **SigListOut,\r | |
107 | IN OUT UINTN *SigListsSize\r | |
108 | )\r | |
bb806a6e | 109 | {\r |
c411b485 MK |
110 | EFI_SIGNATURE_LIST *TmpSigList;\r |
111 | UINT8 *Offset;\r | |
112 | UINTN NewSigListsSize;\r | |
bb806a6e GB |
113 | \r |
114 | NewSigListsSize = *SigListsSize + SigListAppend->SignatureListSize;\r | |
115 | \r | |
c411b485 | 116 | TmpSigList = (EFI_SIGNATURE_LIST *)AllocateZeroPool (NewSigListsSize);\r |
bb806a6e GB |
117 | if (TmpSigList == NULL) {\r |
118 | return EFI_OUT_OF_RESOURCES;\r | |
119 | }\r | |
120 | \r | |
121 | CopyMem (TmpSigList, SigLists, *SigListsSize);\r | |
122 | \r | |
c411b485 | 123 | Offset = (UINT8 *)TmpSigList;\r |
bb806a6e GB |
124 | Offset += *SigListsSize;\r |
125 | CopyMem ((VOID *)Offset, SigListAppend, SigListAppend->SignatureListSize);\r | |
126 | \r | |
127 | *SigListsSize = NewSigListsSize;\r | |
c411b485 | 128 | *SigListOut = TmpSigList;\r |
bb806a6e GB |
129 | return EFI_SUCCESS;\r |
130 | }\r | |
131 | \r | |
132 | /**\r | |
133 | Create a EFI Signature List with data fetched from section specified as a argument.\r | |
134 | Found keys are verified using RsaGetPublicKeyFromX509().\r | |
135 | \r | |
136 | @param[in] KeyFileGuid A pointer to to the FFS filename GUID\r | |
137 | @param[out] SigListsSize A pointer to size of signature list\r | |
56c717aa | 138 | @param[out] SigListsOut a pointer to a callee-allocated buffer with signature lists\r |
bb806a6e GB |
139 | \r |
140 | @retval EFI_SUCCESS Create time based payload successfully.\r | |
141 | @retval EFI_NOT_FOUND Section with key has not been found.\r | |
142 | @retval EFI_INVALID_PARAMETER Embedded key has a wrong format.\r | |
143 | @retval Others Unexpected error happens.\r | |
144 | \r | |
145 | **/\r | |
146 | EFI_STATUS\r | |
147 | SecureBootFetchData (\r | |
c411b485 MK |
148 | IN EFI_GUID *KeyFileGuid,\r |
149 | OUT UINTN *SigListsSize,\r | |
150 | OUT EFI_SIGNATURE_LIST **SigListOut\r | |
151 | )\r | |
bb806a6e | 152 | {\r |
c411b485 MK |
153 | EFI_SIGNATURE_LIST *EfiSig;\r |
154 | EFI_SIGNATURE_LIST *TmpEfiSig;\r | |
155 | EFI_SIGNATURE_LIST *TmpEfiSig2;\r | |
156 | EFI_STATUS Status;\r | |
157 | VOID *Buffer;\r | |
158 | VOID *RsaPubKey;\r | |
bb806a6e GB |
159 | UINTN Size;\r |
160 | UINTN KeyIndex;\r | |
161 | \r | |
c411b485 MK |
162 | KeyIndex = 0;\r |
163 | EfiSig = NULL;\r | |
bb806a6e GB |
164 | *SigListsSize = 0;\r |
165 | while (1) {\r | |
166 | Status = GetSectionFromAnyFv (\r | |
167 | KeyFileGuid,\r | |
168 | EFI_SECTION_RAW,\r | |
169 | KeyIndex,\r | |
170 | &Buffer,\r | |
171 | &Size\r | |
172 | );\r | |
173 | \r | |
174 | if (Status == EFI_SUCCESS) {\r | |
175 | RsaPubKey = NULL;\r | |
176 | if (RsaGetPublicKeyFromX509 (Buffer, Size, &RsaPubKey) == FALSE) {\r | |
177 | DEBUG ((DEBUG_ERROR, "%a: Invalid key format: %d\n", __FUNCTION__, KeyIndex));\r | |
178 | if (EfiSig != NULL) {\r | |
c411b485 | 179 | FreePool (EfiSig);\r |
bb806a6e | 180 | }\r |
c411b485 MK |
181 | \r |
182 | FreePool (Buffer);\r | |
bb806a6e GB |
183 | return EFI_INVALID_PARAMETER;\r |
184 | }\r | |
185 | \r | |
186 | Status = CreateSigList (Buffer, Size, &TmpEfiSig);\r | |
187 | \r | |
188 | //\r | |
189 | // Concatenate lists if more than one section found\r | |
190 | //\r | |
191 | if (KeyIndex == 0) {\r | |
c411b485 | 192 | EfiSig = TmpEfiSig;\r |
bb806a6e GB |
193 | *SigListsSize = TmpEfiSig->SignatureListSize;\r |
194 | } else {\r | |
195 | ConcatenateSigList (EfiSig, TmpEfiSig, &TmpEfiSig2, SigListsSize);\r | |
196 | FreePool (EfiSig);\r | |
197 | FreePool (TmpEfiSig);\r | |
198 | EfiSig = TmpEfiSig2;\r | |
199 | }\r | |
200 | \r | |
201 | KeyIndex++;\r | |
202 | FreePool (Buffer);\r | |
c411b485 MK |
203 | }\r |
204 | \r | |
205 | if (Status == EFI_NOT_FOUND) {\r | |
bb806a6e GB |
206 | break;\r |
207 | }\r | |
c411b485 | 208 | }\r |
bb806a6e GB |
209 | \r |
210 | if (KeyIndex == 0) {\r | |
211 | return EFI_NOT_FOUND;\r | |
212 | }\r | |
213 | \r | |
214 | *SigListOut = EfiSig;\r | |
215 | \r | |
216 | return EFI_SUCCESS;\r | |
217 | }\r | |
218 | \r | |
219 | /**\r | |
220 | Create a time based data payload by concatenating the EFI_VARIABLE_AUTHENTICATION_2\r | |
221 | descriptor with the input data. NO authentication is required in this function.\r | |
222 | \r | |
223 | @param[in, out] DataSize On input, the size of Data buffer in bytes.\r | |
224 | On output, the size of data returned in Data\r | |
225 | buffer in bytes.\r | |
226 | @param[in, out] Data On input, Pointer to data buffer to be wrapped or\r | |
227 | pointer to NULL to wrap an empty payload.\r | |
228 | On output, Pointer to the new payload date buffer allocated from pool,\r | |
229 | it's caller's responsibility to free the memory when finish using it.\r | |
56c717aa | 230 | @param[in] Time Pointer to time information to created time based payload.\r |
bb806a6e GB |
231 | \r |
232 | @retval EFI_SUCCESS Create time based payload successfully.\r | |
233 | @retval EFI_OUT_OF_RESOURCES There are not enough memory resources to create time based payload.\r | |
234 | @retval EFI_INVALID_PARAMETER The parameter is invalid.\r | |
235 | @retval Others Unexpected error happens.\r | |
236 | \r | |
56c717aa | 237 | --*/\r |
bb806a6e | 238 | EFI_STATUS\r |
56c717aa | 239 | EFIAPI\r |
bb806a6e | 240 | CreateTimeBasedPayload (\r |
56c717aa KQ |
241 | IN OUT UINTN *DataSize,\r |
242 | IN OUT UINT8 **Data,\r | |
243 | IN EFI_TIME *Time\r | |
bb806a6e GB |
244 | )\r |
245 | {\r | |
c411b485 MK |
246 | UINT8 *NewData;\r |
247 | UINT8 *Payload;\r | |
248 | UINTN PayloadSize;\r | |
249 | EFI_VARIABLE_AUTHENTICATION_2 *DescriptorData;\r | |
250 | UINTN DescriptorSize;\r | |
c411b485 | 251 | \r |
56c717aa KQ |
252 | if ((Data == NULL) || (DataSize == NULL) || (Time == NULL)) {\r |
253 | DEBUG ((DEBUG_ERROR, "%a(), invalid arg\n", __FUNCTION__));\r | |
bb806a6e GB |
254 | return EFI_INVALID_PARAMETER;\r |
255 | }\r | |
256 | \r | |
257 | //\r | |
258 | // In Setup mode or Custom mode, the variable does not need to be signed but the\r | |
259 | // parameters to the SetVariable() call still need to be prepared as authenticated\r | |
260 | // variable. So we create EFI_VARIABLE_AUTHENTICATED_2 descriptor without certificate\r | |
261 | // data in it.\r | |
262 | //\r | |
263 | Payload = *Data;\r | |
264 | PayloadSize = *DataSize;\r | |
265 | \r | |
c411b485 MK |
266 | DescriptorSize = OFFSET_OF (EFI_VARIABLE_AUTHENTICATION_2, AuthInfo) + OFFSET_OF (WIN_CERTIFICATE_UEFI_GUID, CertData);\r |
267 | NewData = (UINT8 *)AllocateZeroPool (DescriptorSize + PayloadSize);\r | |
bb806a6e | 268 | if (NewData == NULL) {\r |
56c717aa | 269 | DEBUG ((DEBUG_ERROR, "%a() Out of resources.\n", __FUNCTION__));\r |
bb806a6e GB |
270 | return EFI_OUT_OF_RESOURCES;\r |
271 | }\r | |
272 | \r | |
273 | if ((Payload != NULL) && (PayloadSize != 0)) {\r | |
274 | CopyMem (NewData + DescriptorSize, Payload, PayloadSize);\r | |
275 | }\r | |
276 | \r | |
c411b485 | 277 | DescriptorData = (EFI_VARIABLE_AUTHENTICATION_2 *)(NewData);\r |
bb806a6e | 278 | \r |
56c717aa | 279 | CopyMem (&DescriptorData->TimeStamp, Time, sizeof (EFI_TIME));\r |
bb806a6e GB |
280 | \r |
281 | DescriptorData->AuthInfo.Hdr.dwLength = OFFSET_OF (WIN_CERTIFICATE_UEFI_GUID, CertData);\r | |
282 | DescriptorData->AuthInfo.Hdr.wRevision = 0x0200;\r | |
283 | DescriptorData->AuthInfo.Hdr.wCertificateType = WIN_CERT_TYPE_EFI_GUID;\r | |
284 | CopyGuid (&DescriptorData->AuthInfo.CertType, &gEfiCertPkcs7Guid);\r | |
285 | \r | |
286 | if (Payload != NULL) {\r | |
c411b485 | 287 | FreePool (Payload);\r |
56c717aa | 288 | Payload = NULL;\r |
bb806a6e GB |
289 | }\r |
290 | \r | |
291 | *DataSize = DescriptorSize + PayloadSize;\r | |
292 | *Data = NewData;\r | |
293 | return EFI_SUCCESS;\r | |
294 | }\r | |
295 | \r | |
296 | /**\r | |
297 | Internal helper function to delete a Variable given its name and GUID, NO authentication\r | |
298 | required.\r | |
299 | \r | |
300 | @param[in] VariableName Name of the Variable.\r | |
301 | @param[in] VendorGuid GUID of the Variable.\r | |
302 | \r | |
303 | @retval EFI_SUCCESS Variable deleted successfully.\r | |
304 | @retval Others The driver failed to start the device.\r | |
305 | \r | |
306 | **/\r | |
307 | EFI_STATUS\r | |
56c717aa | 308 | EFIAPI\r |
bb806a6e | 309 | DeleteVariable (\r |
c411b485 MK |
310 | IN CHAR16 *VariableName,\r |
311 | IN EFI_GUID *VendorGuid\r | |
bb806a6e GB |
312 | )\r |
313 | {\r | |
c411b485 MK |
314 | EFI_STATUS Status;\r |
315 | VOID *Variable;\r | |
316 | UINT8 *Data;\r | |
317 | UINTN DataSize;\r | |
318 | UINT32 Attr;\r | |
bb806a6e GB |
319 | \r |
320 | GetVariable2 (VariableName, VendorGuid, &Variable, NULL);\r | |
321 | if (Variable == NULL) {\r | |
322 | return EFI_SUCCESS;\r | |
323 | }\r | |
c411b485 | 324 | \r |
bb806a6e GB |
325 | FreePool (Variable);\r |
326 | \r | |
327 | Data = NULL;\r | |
328 | DataSize = 0;\r | |
329 | Attr = EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS\r | |
330 | | EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS;\r | |
331 | \r | |
56c717aa | 332 | Status = CreateTimeBasedPayload (&DataSize, &Data, &mMaxTimestamp);\r |
bb806a6e GB |
333 | if (EFI_ERROR (Status)) {\r |
334 | DEBUG ((DEBUG_ERROR, "Fail to create time-based data payload: %r", Status));\r | |
335 | return Status;\r | |
336 | }\r | |
337 | \r | |
338 | Status = gRT->SetVariable (\r | |
339 | VariableName,\r | |
340 | VendorGuid,\r | |
341 | Attr,\r | |
342 | DataSize,\r | |
343 | Data\r | |
344 | );\r | |
345 | if (Data != NULL) {\r | |
346 | FreePool (Data);\r | |
347 | }\r | |
c411b485 | 348 | \r |
bb806a6e GB |
349 | return Status;\r |
350 | }\r | |
351 | \r | |
352 | /**\r | |
353 | \r | |
354 | Set the platform secure boot mode into "Custom" or "Standard" mode.\r | |
355 | \r | |
356 | @param[in] SecureBootMode New secure boot mode: STANDARD_SECURE_BOOT_MODE or\r | |
357 | CUSTOM_SECURE_BOOT_MODE.\r | |
358 | \r | |
359 | @return EFI_SUCCESS The platform has switched to the special mode successfully.\r | |
360 | @return other Fail to operate the secure boot mode.\r | |
361 | \r | |
362 | **/\r | |
363 | EFI_STATUS\r | |
56c717aa | 364 | EFIAPI\r |
bb806a6e GB |
365 | SetSecureBootMode (\r |
366 | IN UINT8 SecureBootMode\r | |
367 | )\r | |
368 | {\r | |
369 | return gRT->SetVariable (\r | |
370 | EFI_CUSTOM_MODE_NAME,\r | |
371 | &gEfiCustomModeEnableGuid,\r | |
372 | EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS,\r | |
373 | sizeof (UINT8),\r | |
374 | &SecureBootMode\r | |
375 | );\r | |
376 | }\r | |
377 | \r | |
378 | /**\r | |
379 | Fetches the value of SetupMode variable.\r | |
380 | \r | |
381 | @param[out] SetupMode Pointer to UINT8 for SetupMode output\r | |
382 | \r | |
383 | @retval other Retval from GetVariable.\r | |
384 | **/\r | |
385 | EFI_STATUS\r | |
386 | EFIAPI\r | |
387 | GetSetupMode (\r | |
c411b485 MK |
388 | OUT UINT8 *SetupMode\r |
389 | )\r | |
bb806a6e | 390 | {\r |
c411b485 MK |
391 | UINTN Size;\r |
392 | EFI_STATUS Status;\r | |
bb806a6e | 393 | \r |
c411b485 | 394 | Size = sizeof (*SetupMode);\r |
bb806a6e GB |
395 | Status = gRT->GetVariable (\r |
396 | EFI_SETUP_MODE_NAME,\r | |
397 | &gEfiGlobalVariableGuid,\r | |
398 | NULL,\r | |
399 | &Size,\r | |
400 | SetupMode\r | |
401 | );\r | |
402 | if (EFI_ERROR (Status)) {\r | |
403 | return Status;\r | |
404 | }\r | |
405 | \r | |
406 | return EFI_SUCCESS;\r | |
407 | }\r | |
408 | \r | |
409 | /**\r | |
410 | Clears the content of the 'db' variable.\r | |
411 | \r | |
412 | @retval EFI_OUT_OF_RESOURCES If memory allocation for EFI_VARIABLE_AUTHENTICATION_2 fails\r | |
413 | while VendorGuid is NULL.\r | |
414 | @retval other Errors from GetVariable2 (), GetTime () and SetVariable ()\r | |
415 | **/\r | |
416 | EFI_STATUS\r | |
417 | EFIAPI\r | |
418 | DeleteDb (\r | |
419 | VOID\r | |
c411b485 | 420 | )\r |
bb806a6e | 421 | {\r |
c411b485 | 422 | EFI_STATUS Status;\r |
bb806a6e GB |
423 | \r |
424 | Status = DeleteVariable (\r | |
425 | EFI_IMAGE_SECURITY_DATABASE,\r | |
426 | &gEfiImageSecurityDatabaseGuid\r | |
427 | );\r | |
428 | \r | |
429 | return Status;\r | |
430 | }\r | |
431 | \r | |
432 | /**\r | |
433 | Clears the content of the 'dbx' variable.\r | |
434 | \r | |
435 | @retval EFI_OUT_OF_RESOURCES If memory allocation for EFI_VARIABLE_AUTHENTICATION_2 fails\r | |
436 | while VendorGuid is NULL.\r | |
437 | @retval other Errors from GetVariable2 (), GetTime () and SetVariable ()\r | |
438 | **/\r | |
439 | EFI_STATUS\r | |
440 | EFIAPI\r | |
441 | DeleteDbx (\r | |
442 | VOID\r | |
c411b485 | 443 | )\r |
bb806a6e | 444 | {\r |
c411b485 | 445 | EFI_STATUS Status;\r |
bb806a6e GB |
446 | \r |
447 | Status = DeleteVariable (\r | |
448 | EFI_IMAGE_SECURITY_DATABASE1,\r | |
449 | &gEfiImageSecurityDatabaseGuid\r | |
450 | );\r | |
451 | \r | |
452 | return Status;\r | |
453 | }\r | |
454 | \r | |
455 | /**\r | |
456 | Clears the content of the 'dbt' variable.\r | |
457 | \r | |
458 | @retval EFI_OUT_OF_RESOURCES If memory allocation for EFI_VARIABLE_AUTHENTICATION_2 fails\r | |
459 | while VendorGuid is NULL.\r | |
460 | @retval other Errors from GetVariable2 (), GetTime () and SetVariable ()\r | |
461 | **/\r | |
462 | EFI_STATUS\r | |
463 | EFIAPI\r | |
464 | DeleteDbt (\r | |
465 | VOID\r | |
c411b485 | 466 | )\r |
bb806a6e | 467 | {\r |
c411b485 | 468 | EFI_STATUS Status;\r |
bb806a6e GB |
469 | \r |
470 | Status = DeleteVariable (\r | |
471 | EFI_IMAGE_SECURITY_DATABASE2,\r | |
472 | &gEfiImageSecurityDatabaseGuid\r | |
473 | );\r | |
474 | \r | |
475 | return Status;\r | |
476 | }\r | |
477 | \r | |
478 | /**\r | |
479 | Clears the content of the 'KEK' variable.\r | |
480 | \r | |
481 | @retval EFI_OUT_OF_RESOURCES If memory allocation for EFI_VARIABLE_AUTHENTICATION_2 fails\r | |
482 | while VendorGuid is NULL.\r | |
483 | @retval other Errors from GetVariable2 (), GetTime () and SetVariable ()\r | |
484 | **/\r | |
485 | EFI_STATUS\r | |
486 | EFIAPI\r | |
487 | DeleteKEK (\r | |
488 | VOID\r | |
c411b485 | 489 | )\r |
bb806a6e | 490 | {\r |
c411b485 | 491 | EFI_STATUS Status;\r |
bb806a6e GB |
492 | \r |
493 | Status = DeleteVariable (\r | |
494 | EFI_KEY_EXCHANGE_KEY_NAME,\r | |
495 | &gEfiGlobalVariableGuid\r | |
496 | );\r | |
497 | \r | |
498 | return Status;\r | |
499 | }\r | |
500 | \r | |
501 | /**\r | |
502 | Remove the PK variable.\r | |
503 | \r | |
504 | @retval EFI_SUCCESS Delete PK successfully.\r | |
505 | @retval Others Could not allow to delete PK.\r | |
506 | \r | |
507 | **/\r | |
508 | EFI_STATUS\r | |
509 | EFIAPI\r | |
510 | DeletePlatformKey (\r | |
511 | VOID\r | |
c411b485 | 512 | )\r |
bb806a6e | 513 | {\r |
c411b485 | 514 | EFI_STATUS Status;\r |
bb806a6e | 515 | \r |
c411b485 | 516 | Status = SetSecureBootMode (CUSTOM_SECURE_BOOT_MODE);\r |
bb806a6e GB |
517 | if (EFI_ERROR (Status)) {\r |
518 | return Status;\r | |
519 | }\r | |
520 | \r | |
521 | Status = DeleteVariable (\r | |
522 | EFI_PLATFORM_KEY_NAME,\r | |
523 | &gEfiGlobalVariableGuid\r | |
524 | );\r | |
525 | return Status;\r | |
526 | }\r |