2 Implement authentication services for the authenticated variables.
4 Caution: This module requires additional review when modified.
5 This driver will have external input - variable data. It may be input in SMM mode.
6 This external input must be validated carefully to avoid security issue like
7 buffer overflow, integer overflow.
8 Variable attribute should also be checked to avoid authentication bypass.
9 The whole SMM authentication variable design relies on the integrity of flash part and SMM.
10 which is assumed to be protected by platform. All variable code and metadata in flash/SMM Memory
11 may not be modified without authorization. If platform fails to protect these resources,
12 the authentication service provided in this driver will be broken, and the behavior is undefined.
14 ProcessVarWithPk(), ProcessVarWithKek() and ProcessVariable() are the function to do
15 variable authentication.
17 VerifyTimeBasedPayloadAndUpdate() and VerifyCounterBasedPayload() are sub function to do verification.
18 They will do basic validation for authentication data structure, then call crypto library
19 to verify the signature.
21 Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
22 This program and the accompanying materials
23 are licensed and made available under the terms and conditions of the BSD License
24 which accompanies this distribution. The full text of the license may be found at
25 http://opensource.org/licenses/bsd-license.php
27 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
28 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
32 #include "AuthServiceInternal.h"
35 // Public Exponent of RSA Key.
37 CONST UINT8 mRsaE
[] = { 0x01, 0x00, 0x01 };
39 CONST UINT8 mSha256OidValue
[] = { 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01 };
42 // Requirement for different signature type which have been defined in UEFI spec.
43 // These data are used to perform SignatureList format check while setting PK/KEK variable.
45 EFI_SIGNATURE_ITEM mSupportSigItem
[] = {
46 //{SigType, SigHeaderSize, SigDataSize }
47 {EFI_CERT_SHA256_GUID
, 0, 32 },
48 {EFI_CERT_RSA2048_GUID
, 0, 256 },
49 {EFI_CERT_RSA2048_SHA256_GUID
, 0, 256 },
50 {EFI_CERT_SHA1_GUID
, 0, 20 },
51 {EFI_CERT_RSA2048_SHA1_GUID
, 0, 256 },
52 {EFI_CERT_X509_GUID
, 0, ((UINT32
) ~0)},
53 {EFI_CERT_SHA224_GUID
, 0, 28 },
54 {EFI_CERT_SHA384_GUID
, 0, 48 },
55 {EFI_CERT_SHA512_GUID
, 0, 64 },
56 {EFI_CERT_X509_SHA256_GUID
, 0, 48 },
57 {EFI_CERT_X509_SHA384_GUID
, 0, 64 },
58 {EFI_CERT_X509_SHA512_GUID
, 0, 80 }
62 Finds variable in storage blocks of volatile and non-volatile storage areas.
64 This code finds variable in storage blocks of volatile and non-volatile storage areas.
65 If VariableName is an empty string, then we just return the first
66 qualified variable without comparing VariableName and VendorGuid.
68 @param[in] VariableName Name of the variable to be found.
69 @param[in] VendorGuid Variable vendor GUID to be found.
70 @param[out] Data Pointer to data address.
71 @param[out] DataSize Pointer to data size.
73 @retval EFI_INVALID_PARAMETER If VariableName is not an empty string,
74 while VendorGuid is NULL.
75 @retval EFI_SUCCESS Variable successfully found.
76 @retval EFI_NOT_FOUND Variable not found
80 AuthServiceInternalFindVariable (
81 IN CHAR16
*VariableName
,
82 IN EFI_GUID
*VendorGuid
,
88 AUTH_VARIABLE_INFO AuthVariableInfo
;
90 ZeroMem (&AuthVariableInfo
, sizeof (AuthVariableInfo
));
91 Status
= mAuthVarLibContextIn
->FindVariable (
96 *Data
= AuthVariableInfo
.Data
;
97 *DataSize
= AuthVariableInfo
.DataSize
;
102 Update the variable region with Variable information.
104 @param[in] VariableName Name of variable.
105 @param[in] VendorGuid Guid of variable.
106 @param[in] Data Data pointer.
107 @param[in] DataSize Size of Data.
108 @param[in] Attributes Attribute value of the variable.
110 @retval EFI_SUCCESS The update operation is success.
111 @retval EFI_INVALID_PARAMETER Invalid parameter.
112 @retval EFI_WRITE_PROTECTED Variable is write-protected.
113 @retval EFI_OUT_OF_RESOURCES There is not enough resource.
117 AuthServiceInternalUpdateVariable (
118 IN CHAR16
*VariableName
,
119 IN EFI_GUID
*VendorGuid
,
125 AUTH_VARIABLE_INFO AuthVariableInfo
;
127 ZeroMem (&AuthVariableInfo
, sizeof (AuthVariableInfo
));
128 AuthVariableInfo
.VariableName
= VariableName
;
129 AuthVariableInfo
.VendorGuid
= VendorGuid
;
130 AuthVariableInfo
.Data
= Data
;
131 AuthVariableInfo
.DataSize
= DataSize
;
132 AuthVariableInfo
.Attributes
= Attributes
;
134 return mAuthVarLibContextIn
->UpdateVariable (
140 Update the variable region with Variable information.
142 @param[in] VariableName Name of variable.
143 @param[in] VendorGuid Guid of variable.
144 @param[in] Data Data pointer.
145 @param[in] DataSize Size of Data.
146 @param[in] Attributes Attribute value of the variable.
147 @param[in] TimeStamp Value of associated TimeStamp.
149 @retval EFI_SUCCESS The update operation is success.
150 @retval EFI_INVALID_PARAMETER Invalid parameter.
151 @retval EFI_WRITE_PROTECTED Variable is write-protected.
152 @retval EFI_OUT_OF_RESOURCES There is not enough resource.
156 AuthServiceInternalUpdateVariableWithTimeStamp (
157 IN CHAR16
*VariableName
,
158 IN EFI_GUID
*VendorGuid
,
161 IN UINT32 Attributes
,
162 IN EFI_TIME
*TimeStamp
165 EFI_STATUS FindStatus
;
168 AUTH_VARIABLE_INFO AuthVariableInfo
;
170 FindStatus
= AuthServiceInternalFindVariable (
178 // EFI_VARIABLE_APPEND_WRITE attribute only effects for existing variable
180 if (!EFI_ERROR (FindStatus
) && ((Attributes
& EFI_VARIABLE_APPEND_WRITE
) != 0)) {
181 if ((CompareGuid (VendorGuid
, &gEfiImageSecurityDatabaseGuid
) &&
182 ((StrCmp (VariableName
, EFI_IMAGE_SECURITY_DATABASE
) == 0) || (StrCmp (VariableName
, EFI_IMAGE_SECURITY_DATABASE1
) == 0) ||
183 (StrCmp (VariableName
, EFI_IMAGE_SECURITY_DATABASE2
) == 0))) ||
184 (CompareGuid (VendorGuid
, &gEfiGlobalVariableGuid
) && (StrCmp (VariableName
, EFI_KEY_EXCHANGE_KEY_NAME
) == 0))) {
186 // For variables with formatted as EFI_SIGNATURE_LIST, the driver shall not perform an append of
187 // EFI_SIGNATURE_DATA values that are already part of the existing variable value.
189 FilterSignatureList (
198 ZeroMem (&AuthVariableInfo
, sizeof (AuthVariableInfo
));
199 AuthVariableInfo
.VariableName
= VariableName
;
200 AuthVariableInfo
.VendorGuid
= VendorGuid
;
201 AuthVariableInfo
.Data
= Data
;
202 AuthVariableInfo
.DataSize
= DataSize
;
203 AuthVariableInfo
.Attributes
= Attributes
;
204 AuthVariableInfo
.TimeStamp
= TimeStamp
;
205 return mAuthVarLibContextIn
->UpdateVariable (
211 Determine whether this operation needs a physical present user.
213 @param[in] VariableName Name of the Variable.
214 @param[in] VendorGuid GUID of the Variable.
216 @retval TRUE This variable is protected, only a physical present user could set this variable.
217 @retval FALSE This variable is not protected.
221 NeedPhysicallyPresent(
222 IN CHAR16
*VariableName
,
223 IN EFI_GUID
*VendorGuid
226 if ((CompareGuid (VendorGuid
, &gEfiSecureBootEnableDisableGuid
) && (StrCmp (VariableName
, EFI_SECURE_BOOT_ENABLE_NAME
) == 0))
227 || (CompareGuid (VendorGuid
, &gEfiCustomModeEnableGuid
) && (StrCmp (VariableName
, EFI_CUSTOM_MODE_NAME
) == 0))) {
235 Determine whether the platform is operating in Custom Secure Boot mode.
237 @retval TRUE The platform is operating in Custom mode.
238 @retval FALSE The platform is operating in Standard mode.
250 Status
= AuthServiceInternalFindVariable (EFI_CUSTOM_MODE_NAME
, &gEfiCustomModeEnableGuid
, &Data
, &DataSize
);
251 if (!EFI_ERROR (Status
) && (*(UINT8
*) Data
== CUSTOM_SECURE_BOOT_MODE
)) {
259 Update platform mode.
261 @param[in] Mode SETUP_MODE or USER_MODE.
263 @return EFI_INVALID_PARAMETER Invalid parameter.
264 @return EFI_SUCCESS Update platform mode successfully.
275 UINT8 SecureBootMode
;
276 UINT8 SecureBootEnable
;
277 UINTN VariableDataSize
;
279 Status
= AuthServiceInternalFindVariable (
281 &gEfiGlobalVariableGuid
,
285 if (EFI_ERROR (Status
)) {
290 // Update the value of SetupMode variable by a simple mem copy, this could avoid possible
291 // variable storage reclaim at runtime.
293 mPlatformMode
= (UINT8
) Mode
;
294 CopyMem (Data
, &mPlatformMode
, sizeof(UINT8
));
296 if (mAuthVarLibContextIn
->AtRuntime ()) {
298 // SecureBoot Variable indicates whether the platform firmware is operating
299 // in Secure boot mode (1) or not (0), so we should not change SecureBoot
300 // Variable in runtime.
306 // Check "SecureBoot" variable's existence.
307 // If it doesn't exist, firmware has no capability to perform driver signing verification,
308 // then set "SecureBoot" to 0.
310 Status
= AuthServiceInternalFindVariable (
311 EFI_SECURE_BOOT_MODE_NAME
,
312 &gEfiGlobalVariableGuid
,
317 // If "SecureBoot" variable exists, then check "SetupMode" variable update.
318 // If "SetupMode" variable is USER_MODE, "SecureBoot" variable is set to 1.
319 // If "SetupMode" variable is SETUP_MODE, "SecureBoot" variable is set to 0.
321 if (EFI_ERROR (Status
)) {
322 SecureBootMode
= SECURE_BOOT_MODE_DISABLE
;
324 if (mPlatformMode
== USER_MODE
) {
325 SecureBootMode
= SECURE_BOOT_MODE_ENABLE
;
326 } else if (mPlatformMode
== SETUP_MODE
) {
327 SecureBootMode
= SECURE_BOOT_MODE_DISABLE
;
329 return EFI_NOT_FOUND
;
333 Status
= AuthServiceInternalUpdateVariable (
334 EFI_SECURE_BOOT_MODE_NAME
,
335 &gEfiGlobalVariableGuid
,
338 EFI_VARIABLE_RUNTIME_ACCESS
| EFI_VARIABLE_BOOTSERVICE_ACCESS
340 if (EFI_ERROR (Status
)) {
345 // Check "SecureBootEnable" variable's existence. It can enable/disable secure boot feature.
347 Status
= AuthServiceInternalFindVariable (
348 EFI_SECURE_BOOT_ENABLE_NAME
,
349 &gEfiSecureBootEnableDisableGuid
,
354 if (SecureBootMode
== SECURE_BOOT_MODE_ENABLE
) {
356 // Create the "SecureBootEnable" variable as secure boot is enabled.
358 SecureBootEnable
= SECURE_BOOT_ENABLE
;
359 VariableDataSize
= sizeof (SecureBootEnable
);
362 // Delete the "SecureBootEnable" variable if this variable exist as "SecureBoot"
363 // variable is not in secure boot state.
365 if (EFI_ERROR (Status
)) {
368 SecureBootEnable
= SECURE_BOOT_DISABLE
;
369 VariableDataSize
= 0;
372 Status
= AuthServiceInternalUpdateVariable (
373 EFI_SECURE_BOOT_ENABLE_NAME
,
374 &gEfiSecureBootEnableDisableGuid
,
377 EFI_VARIABLE_NON_VOLATILE
| EFI_VARIABLE_BOOTSERVICE_ACCESS
383 Check input data form to make sure it is a valid EFI_SIGNATURE_LIST for PK/KEK/db/dbx/dbt variable.
385 @param[in] VariableName Name of Variable to be check.
386 @param[in] VendorGuid Variable vendor GUID.
387 @param[in] Data Point to the variable data to be checked.
388 @param[in] DataSize Size of Data.
390 @return EFI_INVALID_PARAMETER Invalid signature list format.
391 @return EFI_SUCCESS Passed signature list format check successfully.
395 CheckSignatureListFormat(
396 IN CHAR16
*VariableName
,
397 IN EFI_GUID
*VendorGuid
,
402 EFI_SIGNATURE_LIST
*SigList
;
408 EFI_SIGNATURE_DATA
*CertData
;
415 ASSERT (VariableName
!= NULL
&& VendorGuid
!= NULL
&& Data
!= NULL
);
417 if (CompareGuid (VendorGuid
, &gEfiGlobalVariableGuid
) && (StrCmp (VariableName
, EFI_PLATFORM_KEY_NAME
) == 0)){
419 } else if ((CompareGuid (VendorGuid
, &gEfiGlobalVariableGuid
) && (StrCmp (VariableName
, EFI_KEY_EXCHANGE_KEY_NAME
) == 0)) ||
420 (CompareGuid (VendorGuid
, &gEfiImageSecurityDatabaseGuid
) &&
421 ((StrCmp (VariableName
, EFI_IMAGE_SECURITY_DATABASE
) == 0) || (StrCmp (VariableName
, EFI_IMAGE_SECURITY_DATABASE1
) == 0) ||
422 (StrCmp (VariableName
, EFI_IMAGE_SECURITY_DATABASE2
) == 0)))) {
429 SigList
= (EFI_SIGNATURE_LIST
*) Data
;
430 SigDataSize
= DataSize
;
434 // Walk throuth the input signature list and check the data format.
435 // If any signature is incorrectly formed, the whole check will fail.
437 while ((SigDataSize
> 0) && (SigDataSize
>= SigList
->SignatureListSize
)) {
438 for (Index
= 0; Index
< (sizeof (mSupportSigItem
) / sizeof (EFI_SIGNATURE_ITEM
)); Index
++ ) {
439 if (CompareGuid (&SigList
->SignatureType
, &mSupportSigItem
[Index
].SigType
)) {
441 // The value of SignatureSize should always be 16 (size of SignatureOwner
442 // component) add the data length according to signature type.
444 if (mSupportSigItem
[Index
].SigDataSize
!= ((UINT32
) ~0) &&
445 (SigList
->SignatureSize
- sizeof (EFI_GUID
)) != mSupportSigItem
[Index
].SigDataSize
) {
446 return EFI_INVALID_PARAMETER
;
448 if (mSupportSigItem
[Index
].SigHeaderSize
!= ((UINT32
) ~0) &&
449 SigList
->SignatureHeaderSize
!= mSupportSigItem
[Index
].SigHeaderSize
) {
450 return EFI_INVALID_PARAMETER
;
456 if (Index
== (sizeof (mSupportSigItem
) / sizeof (EFI_SIGNATURE_ITEM
))) {
458 // Undefined signature type.
460 return EFI_INVALID_PARAMETER
;
463 if (CompareGuid (&SigList
->SignatureType
, &gEfiCertX509Guid
)) {
465 // Try to retrieve the RSA public key from the X.509 certificate.
466 // If this operation fails, it's not a valid certificate.
468 RsaContext
= RsaNew ();
469 if (RsaContext
== NULL
) {
470 return EFI_INVALID_PARAMETER
;
472 CertData
= (EFI_SIGNATURE_DATA
*) ((UINT8
*) SigList
+ sizeof (EFI_SIGNATURE_LIST
) + SigList
->SignatureHeaderSize
);
473 CertLen
= SigList
->SignatureSize
- sizeof (EFI_GUID
);
474 if (!RsaGetPublicKeyFromX509 (CertData
->SignatureData
, CertLen
, &RsaContext
)) {
475 RsaFree (RsaContext
);
476 return EFI_INVALID_PARAMETER
;
478 RsaFree (RsaContext
);
481 if ((SigList
->SignatureListSize
- sizeof (EFI_SIGNATURE_LIST
) - SigList
->SignatureHeaderSize
) % SigList
->SignatureSize
!= 0) {
482 return EFI_INVALID_PARAMETER
;
484 SigCount
+= (SigList
->SignatureListSize
- sizeof (EFI_SIGNATURE_LIST
) - SigList
->SignatureHeaderSize
) / SigList
->SignatureSize
;
486 SigDataSize
-= SigList
->SignatureListSize
;
487 SigList
= (EFI_SIGNATURE_LIST
*) ((UINT8
*) SigList
+ SigList
->SignatureListSize
);
490 if (((UINTN
) SigList
- (UINTN
) Data
) != DataSize
) {
491 return EFI_INVALID_PARAMETER
;
494 if (IsPk
&& SigCount
> 1) {
495 return EFI_INVALID_PARAMETER
;
502 Update "VendorKeys" variable to record the out of band secure boot key modification.
504 @return EFI_SUCCESS Variable is updated successfully.
505 @return Others Failed to update variable.
509 VendorKeyIsModified (
515 if (mVendorKeyState
== VENDOR_KEYS_MODIFIED
) {
518 mVendorKeyState
= VENDOR_KEYS_MODIFIED
;
520 Status
= AuthServiceInternalUpdateVariable (
521 EFI_VENDOR_KEYS_NV_VARIABLE_NAME
,
522 &gEfiVendorKeysNvGuid
,
525 EFI_VARIABLE_NON_VOLATILE
| EFI_VARIABLE_BOOTSERVICE_ACCESS
| EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS
527 if (EFI_ERROR (Status
)) {
531 return AuthServiceInternalUpdateVariable (
532 EFI_VENDOR_KEYS_VARIABLE_NAME
,
533 &gEfiGlobalVariableGuid
,
536 EFI_VARIABLE_RUNTIME_ACCESS
| EFI_VARIABLE_BOOTSERVICE_ACCESS
541 Process variable with platform key for verification.
543 Caution: This function may receive untrusted input.
544 This function may be invoked in SMM mode, and datasize and data are external input.
545 This function will do basic validation, before parse the data.
546 This function will parse the authentication carefully to avoid security issues, like
547 buffer overflow, integer overflow.
548 This function will check attribute carefully to avoid authentication bypass.
550 @param[in] VariableName Name of Variable to be found.
551 @param[in] VendorGuid Variable vendor GUID.
552 @param[in] Data Data pointer.
553 @param[in] DataSize Size of Data found. If size is less than the
554 data, this value contains the required size.
555 @param[in] Attributes Attribute value of the variable
556 @param[in] IsPk Indicate whether it is to process pk.
558 @return EFI_INVALID_PARAMETER Invalid parameter.
559 @return EFI_SECURITY_VIOLATION The variable does NOT pass the validation.
560 check carried out by the firmware.
561 @return EFI_SUCCESS Variable passed validation successfully.
566 IN CHAR16
*VariableName
,
567 IN EFI_GUID
*VendorGuid
,
570 IN UINT32 Attributes OPTIONAL
,
579 if ((Attributes
& EFI_VARIABLE_NON_VOLATILE
) == 0 ||
580 (Attributes
& EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS
) == 0) {
582 // PK, KEK and db/dbx/dbt should set EFI_VARIABLE_NON_VOLATILE attribute and should be a time-based
583 // authenticated variable.
585 return EFI_INVALID_PARAMETER
;
589 // Init state of Del. State may change due to secure check
592 if ((InCustomMode() && UserPhysicalPresent()) || (mPlatformMode
== SETUP_MODE
&& !IsPk
)) {
593 Payload
= (UINT8
*) Data
+ AUTHINFO2_SIZE (Data
);
594 PayloadSize
= DataSize
- AUTHINFO2_SIZE (Data
);
595 if (PayloadSize
== 0) {
599 Status
= CheckSignatureListFormat(VariableName
, VendorGuid
, Payload
, PayloadSize
);
600 if (EFI_ERROR (Status
)) {
604 Status
= AuthServiceInternalUpdateVariableWithTimeStamp (
610 &((EFI_VARIABLE_AUTHENTICATION_2
*) Data
)->TimeStamp
612 if (EFI_ERROR(Status
)) {
616 if ((mPlatformMode
!= SETUP_MODE
) || IsPk
) {
617 Status
= VendorKeyIsModified ();
619 } else if (mPlatformMode
== USER_MODE
) {
621 // Verify against X509 Cert in PK database.
623 Status
= VerifyTimeBasedPayloadAndUpdate (
634 // Verify against the certificate in data payload.
636 Status
= VerifyTimeBasedPayloadAndUpdate (
647 if (!EFI_ERROR(Status
) && IsPk
) {
648 if (mPlatformMode
== SETUP_MODE
&& !Del
) {
650 // If enroll PK in setup mode, need change to user mode.
652 Status
= UpdatePlatformMode (USER_MODE
);
653 } else if (mPlatformMode
== USER_MODE
&& Del
){
655 // If delete PK in user mode, need change to setup mode.
657 Status
= UpdatePlatformMode (SETUP_MODE
);
665 Process variable with key exchange key for verification.
667 Caution: This function may receive untrusted input.
668 This function may be invoked in SMM mode, and datasize and data are external input.
669 This function will do basic validation, before parse the data.
670 This function will parse the authentication carefully to avoid security issues, like
671 buffer overflow, integer overflow.
672 This function will check attribute carefully to avoid authentication bypass.
674 @param[in] VariableName Name of Variable to be found.
675 @param[in] VendorGuid Variable vendor GUID.
676 @param[in] Data Data pointer.
677 @param[in] DataSize Size of Data found. If size is less than the
678 data, this value contains the required size.
679 @param[in] Attributes Attribute value of the variable.
681 @return EFI_INVALID_PARAMETER Invalid parameter.
682 @return EFI_SECURITY_VIOLATION The variable does NOT pass the validation
683 check carried out by the firmware.
684 @return EFI_SUCCESS Variable pass validation successfully.
689 IN CHAR16
*VariableName
,
690 IN EFI_GUID
*VendorGuid
,
693 IN UINT32 Attributes OPTIONAL
700 if ((Attributes
& EFI_VARIABLE_NON_VOLATILE
) == 0 ||
701 (Attributes
& EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS
) == 0) {
703 // DB, DBX and DBT should set EFI_VARIABLE_NON_VOLATILE attribute and should be a time-based
704 // authenticated variable.
706 return EFI_INVALID_PARAMETER
;
709 Status
= EFI_SUCCESS
;
710 if (mPlatformMode
== USER_MODE
&& !(InCustomMode() && UserPhysicalPresent())) {
712 // Time-based, verify against X509 Cert KEK.
714 return VerifyTimeBasedPayloadAndUpdate (
725 // If in setup mode or custom secure boot mode, no authentication needed.
727 Payload
= (UINT8
*) Data
+ AUTHINFO2_SIZE (Data
);
728 PayloadSize
= DataSize
- AUTHINFO2_SIZE (Data
);
730 Status
= CheckSignatureListFormat(VariableName
, VendorGuid
, Payload
, PayloadSize
);
731 if (EFI_ERROR (Status
)) {
735 Status
= AuthServiceInternalUpdateVariableWithTimeStamp (
741 &((EFI_VARIABLE_AUTHENTICATION_2
*) Data
)->TimeStamp
743 if (EFI_ERROR (Status
)) {
747 if (mPlatformMode
!= SETUP_MODE
) {
748 Status
= VendorKeyIsModified ();
756 Check if it is to delete auth variable.
758 @param[in] OrgAttributes Original attribute value of the variable.
759 @param[in] Data Data pointer.
760 @param[in] DataSize Size of Data.
761 @param[in] Attributes Attribute value of the variable.
763 @retval TRUE It is to delete auth variable.
764 @retval FALSE It is not to delete auth variable.
768 IsDeleteAuthVariable (
769 IN UINT32 OrgAttributes
,
781 // To delete a variable created with the EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS
782 // or the EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS attribute,
783 // SetVariable must be used with attributes matching the existing variable
784 // and the DataSize set to the size of the AuthInfo descriptor.
786 if ((Attributes
== OrgAttributes
) &&
787 ((Attributes
& (EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS
| EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS
)) != 0)) {
788 if ((Attributes
& EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS
) != 0) {
789 PayloadSize
= DataSize
- AUTHINFO2_SIZE (Data
);
790 if (PayloadSize
== 0) {
794 PayloadSize
= DataSize
- AUTHINFO_SIZE
;
795 if (PayloadSize
== 0) {
805 Process variable with EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS set
807 Caution: This function may receive untrusted input.
808 This function may be invoked in SMM mode, and datasize and data are external input.
809 This function will do basic validation, before parse the data.
810 This function will parse the authentication carefully to avoid security issues, like
811 buffer overflow, integer overflow.
812 This function will check attribute carefully to avoid authentication bypass.
814 @param[in] VariableName Name of the variable.
815 @param[in] VendorGuid Variable vendor GUID.
816 @param[in] Data Data pointer.
817 @param[in] DataSize Size of Data.
818 @param[in] Attributes Attribute value of the variable.
820 @return EFI_INVALID_PARAMETER Invalid parameter.
821 @return EFI_WRITE_PROTECTED Variable is write-protected and needs authentication with
822 EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS or EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS set.
823 @return EFI_OUT_OF_RESOURCES The Database to save the public key is full.
824 @return EFI_SECURITY_VIOLATION The variable is with EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS
825 set, but the AuthInfo does NOT pass the validation
826 check carried out by the firmware.
827 @return EFI_SUCCESS Variable is not write-protected or pass validation successfully.
832 IN CHAR16
*VariableName
,
833 IN EFI_GUID
*VendorGuid
,
840 AUTH_VARIABLE_INFO OrgVariableInfo
;
842 Status
= EFI_SUCCESS
;
844 ZeroMem (&OrgVariableInfo
, sizeof (OrgVariableInfo
));
845 Status
= mAuthVarLibContextIn
->FindVariable (
851 if ((!EFI_ERROR (Status
)) && IsDeleteAuthVariable (OrgVariableInfo
.Attributes
, Data
, DataSize
, Attributes
) && UserPhysicalPresent()) {
853 // Allow the delete operation of common authenticated variable(AT or AW) at user physical presence.
855 Status
= AuthServiceInternalUpdateVariable (
862 if (!EFI_ERROR (Status
) && ((Attributes
& EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS
) != 0)) {
863 Status
= DeleteCertsFromDb (VariableName
, VendorGuid
, Attributes
);
869 if (NeedPhysicallyPresent (VariableName
, VendorGuid
) && !UserPhysicalPresent()) {
871 // This variable is protected, only physical present user could modify its value.
873 return EFI_SECURITY_VIOLATION
;
877 if ((Attributes
& EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS
) != 0) {
879 // Reject Counter Based Auth Variable processing request.
881 return EFI_UNSUPPORTED
;
882 } else if ((Attributes
& EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS
) != 0) {
884 // Process Time-based Authenticated variable.
886 return VerifyTimeBasedPayloadAndUpdate (
897 if ((OrgVariableInfo
.Data
!= NULL
) &&
898 ((OrgVariableInfo
.Attributes
& (EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS
| EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS
)) != 0)) {
900 // If the variable is already write-protected, it always needs authentication before update.
902 return EFI_WRITE_PROTECTED
;
906 // Not authenticated variable, just update variable as usual.
908 Status
= AuthServiceInternalUpdateVariable (VariableName
, VendorGuid
, Data
, DataSize
, Attributes
);
914 Filter out the duplicated EFI_SIGNATURE_DATA from the new data by comparing to the original data.
916 @param[in] Data Pointer to original EFI_SIGNATURE_LIST.
917 @param[in] DataSize Size of Data buffer.
918 @param[in, out] NewData Pointer to new EFI_SIGNATURE_LIST.
919 @param[in, out] NewDataSize Size of NewData buffer.
923 FilterSignatureList (
926 IN OUT VOID
*NewData
,
927 IN OUT UINTN
*NewDataSize
930 EFI_SIGNATURE_LIST
*CertList
;
931 EFI_SIGNATURE_DATA
*Cert
;
933 EFI_SIGNATURE_LIST
*NewCertList
;
934 EFI_SIGNATURE_DATA
*NewCert
;
941 UINTN SignatureListSize
;
947 if (*NewDataSize
== 0) {
951 TempDataSize
= *NewDataSize
;
952 Status
= mAuthVarLibContextIn
->GetScratchBuffer (&TempDataSize
, (VOID
**) &TempData
);
953 if (EFI_ERROR (Status
)) {
954 return EFI_OUT_OF_RESOURCES
;
959 NewCertList
= (EFI_SIGNATURE_LIST
*) NewData
;
960 while ((*NewDataSize
> 0) && (*NewDataSize
>= NewCertList
->SignatureListSize
)) {
961 NewCert
= (EFI_SIGNATURE_DATA
*) ((UINT8
*) NewCertList
+ sizeof (EFI_SIGNATURE_LIST
) + NewCertList
->SignatureHeaderSize
);
962 NewCertCount
= (NewCertList
->SignatureListSize
- sizeof (EFI_SIGNATURE_LIST
) - NewCertList
->SignatureHeaderSize
) / NewCertList
->SignatureSize
;
965 for (Index
= 0; Index
< NewCertCount
; Index
++) {
969 CertList
= (EFI_SIGNATURE_LIST
*) Data
;
970 while ((Size
> 0) && (Size
>= CertList
->SignatureListSize
)) {
971 if (CompareGuid (&CertList
->SignatureType
, &NewCertList
->SignatureType
) &&
972 (CertList
->SignatureSize
== NewCertList
->SignatureSize
)) {
973 Cert
= (EFI_SIGNATURE_DATA
*) ((UINT8
*) CertList
+ sizeof (EFI_SIGNATURE_LIST
) + CertList
->SignatureHeaderSize
);
974 CertCount
= (CertList
->SignatureListSize
- sizeof (EFI_SIGNATURE_LIST
) - CertList
->SignatureHeaderSize
) / CertList
->SignatureSize
;
975 for (Index2
= 0; Index2
< CertCount
; Index2
++) {
977 // Iterate each Signature Data in this Signature List.
979 if (CompareMem (NewCert
, Cert
, CertList
->SignatureSize
) == 0) {
983 Cert
= (EFI_SIGNATURE_DATA
*) ((UINT8
*) Cert
+ CertList
->SignatureSize
);
990 Size
-= CertList
->SignatureListSize
;
991 CertList
= (EFI_SIGNATURE_LIST
*) ((UINT8
*) CertList
+ CertList
->SignatureListSize
);
996 // New EFI_SIGNATURE_DATA, keep it.
998 if (CopiedCount
== 0) {
1000 // Copy EFI_SIGNATURE_LIST header for only once.
1002 CopyMem (Tail
, NewCertList
, sizeof (EFI_SIGNATURE_LIST
) + NewCertList
->SignatureHeaderSize
);
1003 Tail
= Tail
+ sizeof (EFI_SIGNATURE_LIST
) + NewCertList
->SignatureHeaderSize
;
1006 CopyMem (Tail
, NewCert
, NewCertList
->SignatureSize
);
1007 Tail
+= NewCertList
->SignatureSize
;
1011 NewCert
= (EFI_SIGNATURE_DATA
*) ((UINT8
*) NewCert
+ NewCertList
->SignatureSize
);
1015 // Update SignatureListSize in the kept EFI_SIGNATURE_LIST.
1017 if (CopiedCount
!= 0) {
1018 SignatureListSize
= sizeof (EFI_SIGNATURE_LIST
) + NewCertList
->SignatureHeaderSize
+ (CopiedCount
* NewCertList
->SignatureSize
);
1019 CertList
= (EFI_SIGNATURE_LIST
*) (Tail
- SignatureListSize
);
1020 CertList
->SignatureListSize
= (UINT32
) SignatureListSize
;
1023 *NewDataSize
-= NewCertList
->SignatureListSize
;
1024 NewCertList
= (EFI_SIGNATURE_LIST
*) ((UINT8
*) NewCertList
+ NewCertList
->SignatureListSize
);
1027 TempDataSize
= (Tail
- (UINT8
*) TempData
);
1029 CopyMem (NewData
, TempData
, TempDataSize
);
1030 *NewDataSize
= TempDataSize
;
1036 Compare two EFI_TIME data.
1039 @param FirstTime A pointer to the first EFI_TIME data.
1040 @param SecondTime A pointer to the second EFI_TIME data.
1042 @retval TRUE The FirstTime is not later than the SecondTime.
1043 @retval FALSE The FirstTime is later than the SecondTime.
1047 AuthServiceInternalCompareTimeStamp (
1048 IN EFI_TIME
*FirstTime
,
1049 IN EFI_TIME
*SecondTime
1052 if (FirstTime
->Year
!= SecondTime
->Year
) {
1053 return (BOOLEAN
) (FirstTime
->Year
< SecondTime
->Year
);
1054 } else if (FirstTime
->Month
!= SecondTime
->Month
) {
1055 return (BOOLEAN
) (FirstTime
->Month
< SecondTime
->Month
);
1056 } else if (FirstTime
->Day
!= SecondTime
->Day
) {
1057 return (BOOLEAN
) (FirstTime
->Day
< SecondTime
->Day
);
1058 } else if (FirstTime
->Hour
!= SecondTime
->Hour
) {
1059 return (BOOLEAN
) (FirstTime
->Hour
< SecondTime
->Hour
);
1060 } else if (FirstTime
->Minute
!= SecondTime
->Minute
) {
1061 return (BOOLEAN
) (FirstTime
->Minute
< SecondTime
->Minute
);
1064 return (BOOLEAN
) (FirstTime
->Second
<= SecondTime
->Second
);
1068 Calculate SHA256 digest of SignerCert CommonName + ToplevelCert tbsCertificate
1069 SignerCert and ToplevelCert are inside the signer certificate chain.
1071 @param[in] SignerCert A pointer to SignerCert data.
1072 @param[in] SignerCertSize Length of SignerCert data.
1073 @param[in] TopLevelCert A pointer to TopLevelCert data.
1074 @param[in] TopLevelCertSize Length of TopLevelCert data.
1075 @param[out] Sha256Digest Sha256 digest calculated.
1077 @return EFI_ABORTED Digest process failed.
1078 @return EFI_SUCCESS SHA256 Digest is succesfully calculated.
1082 CalculatePrivAuthVarSignChainSHA256Digest(
1083 IN UINT8
*SignerCert
,
1084 IN UINTN SignerCertSize
,
1085 IN UINT8
*TopLevelCert
,
1086 IN UINTN TopLevelCertSize
,
1087 OUT UINT8
*Sha256Digest
1092 CHAR8 CertCommonName
[128];
1093 UINTN CertCommonNameSize
;
1094 BOOLEAN CryptoStatus
;
1097 CertCommonNameSize
= sizeof(CertCommonName
);
1100 // Get SignerCert CommonName
1102 Status
= X509GetCommonName(SignerCert
, SignerCertSize
, CertCommonName
, &CertCommonNameSize
);
1103 if (EFI_ERROR(Status
)) {
1104 DEBUG((DEBUG_INFO
, "%a Get SignerCert CommonName failed with status %x\n", __FUNCTION__
, Status
));
1109 // Get TopLevelCert tbsCertificate
1111 if (!X509GetTBSCert(TopLevelCert
, TopLevelCertSize
, &TbsCert
, &TbsCertSize
)) {
1112 DEBUG((DEBUG_INFO
, "%a Get Top-level Cert tbsCertificate failed!\n", __FUNCTION__
));
1117 // Digest SignerCert CN + TopLevelCert tbsCertificate
1119 ZeroMem (Sha256Digest
, SHA256_DIGEST_SIZE
);
1120 CryptoStatus
= Sha256Init (mHashCtx
);
1121 if (!CryptoStatus
) {
1126 // '\0' is forced in CertCommonName. No overflow issue
1128 CryptoStatus
= Sha256Update (
1131 AsciiStrLen (CertCommonName
)
1133 if (!CryptoStatus
) {
1137 CryptoStatus
= Sha256Update (mHashCtx
, TbsCert
, TbsCertSize
);
1138 if (!CryptoStatus
) {
1142 CryptoStatus
= Sha256Final (mHashCtx
, Sha256Digest
);
1143 if (!CryptoStatus
) {
1151 Find matching signer's certificates for common authenticated variable
1152 by corresponding VariableName and VendorGuid from "certdb" or "certdbv".
1154 The data format of "certdb" or "certdbv":
1156 // UINT32 CertDbListSize;
1157 // /// AUTH_CERT_DB_DATA Certs1[];
1158 // /// AUTH_CERT_DB_DATA Certs2[];
1160 // /// AUTH_CERT_DB_DATA Certsn[];
1163 @param[in] VariableName Name of authenticated Variable.
1164 @param[in] VendorGuid Vendor GUID of authenticated Variable.
1165 @param[in] Data Pointer to variable "certdb" or "certdbv".
1166 @param[in] DataSize Size of variable "certdb" or "certdbv".
1167 @param[out] CertOffset Offset of matching CertData, from starting of Data.
1168 @param[out] CertDataSize Length of CertData in bytes.
1169 @param[out] CertNodeOffset Offset of matching AUTH_CERT_DB_DATA , from
1171 @param[out] CertNodeSize Length of AUTH_CERT_DB_DATA in bytes.
1173 @retval EFI_INVALID_PARAMETER Any input parameter is invalid.
1174 @retval EFI_NOT_FOUND Fail to find matching certs.
1175 @retval EFI_SUCCESS Find matching certs and output parameters.
1180 IN CHAR16
*VariableName
,
1181 IN EFI_GUID
*VendorGuid
,
1184 OUT UINT32
*CertOffset
, OPTIONAL
1185 OUT UINT32
*CertDataSize
, OPTIONAL
1186 OUT UINT32
*CertNodeOffset
,OPTIONAL
1187 OUT UINT32
*CertNodeSize OPTIONAL
1191 AUTH_CERT_DB_DATA
*Ptr
;
1195 UINT32 CertDbListSize
;
1197 if ((VariableName
== NULL
) || (VendorGuid
== NULL
) || (Data
== NULL
)) {
1198 return EFI_INVALID_PARAMETER
;
1202 // Check whether DataSize matches recorded CertDbListSize.
1204 if (DataSize
< sizeof (UINT32
)) {
1205 return EFI_INVALID_PARAMETER
;
1208 CertDbListSize
= ReadUnaligned32 ((UINT32
*) Data
);
1210 if (CertDbListSize
!= (UINT32
) DataSize
) {
1211 return EFI_INVALID_PARAMETER
;
1214 Offset
= sizeof (UINT32
);
1217 // Get corresponding certificates by VendorGuid and VariableName.
1219 while (Offset
< (UINT32
) DataSize
) {
1220 Ptr
= (AUTH_CERT_DB_DATA
*) (Data
+ Offset
);
1222 // Check whether VendorGuid matches.
1224 if (CompareGuid (&Ptr
->VendorGuid
, VendorGuid
)) {
1225 NodeSize
= ReadUnaligned32 (&Ptr
->CertNodeSize
);
1226 NameSize
= ReadUnaligned32 (&Ptr
->NameSize
);
1227 CertSize
= ReadUnaligned32 (&Ptr
->CertDataSize
);
1229 if (NodeSize
!= sizeof (EFI_GUID
) + sizeof (UINT32
) * 3 + CertSize
+
1230 sizeof (CHAR16
) * NameSize
) {
1231 return EFI_INVALID_PARAMETER
;
1234 Offset
= Offset
+ sizeof (EFI_GUID
) + sizeof (UINT32
) * 3;
1236 // Check whether VariableName matches.
1238 if ((NameSize
== StrLen (VariableName
)) &&
1239 (CompareMem (Data
+ Offset
, VariableName
, NameSize
* sizeof (CHAR16
)) == 0)) {
1240 Offset
= Offset
+ NameSize
* sizeof (CHAR16
);
1242 if (CertOffset
!= NULL
) {
1243 *CertOffset
= Offset
;
1246 if (CertDataSize
!= NULL
) {
1247 *CertDataSize
= CertSize
;
1250 if (CertNodeOffset
!= NULL
) {
1251 *CertNodeOffset
= (UINT32
) ((UINT8
*) Ptr
- Data
);
1254 if (CertNodeSize
!= NULL
) {
1255 *CertNodeSize
= NodeSize
;
1260 Offset
= Offset
+ NameSize
* sizeof (CHAR16
) + CertSize
;
1263 NodeSize
= ReadUnaligned32 (&Ptr
->CertNodeSize
);
1264 Offset
= Offset
+ NodeSize
;
1268 return EFI_NOT_FOUND
;
1272 Retrieve signer's certificates for common authenticated variable
1273 by corresponding VariableName and VendorGuid from "certdb"
1274 or "certdbv" according to authenticated variable attributes.
1276 @param[in] VariableName Name of authenticated Variable.
1277 @param[in] VendorGuid Vendor GUID of authenticated Variable.
1278 @param[in] Attributes Attributes of authenticated variable.
1279 @param[out] CertData Pointer to signer's certificates.
1280 @param[out] CertDataSize Length of CertData in bytes.
1282 @retval EFI_INVALID_PARAMETER Any input parameter is invalid.
1283 @retval EFI_NOT_FOUND Fail to find "certdb"/"certdbv" or matching certs.
1284 @retval EFI_SUCCESS Get signer's certificates successfully.
1289 IN CHAR16
*VariableName
,
1290 IN EFI_GUID
*VendorGuid
,
1291 IN UINT32 Attributes
,
1292 OUT UINT8
**CertData
,
1293 OUT UINT32
*CertDataSize
1302 if ((VariableName
== NULL
) || (VendorGuid
== NULL
) || (CertData
== NULL
) || (CertDataSize
== NULL
)) {
1303 return EFI_INVALID_PARAMETER
;
1307 if ((Attributes
& EFI_VARIABLE_NON_VOLATILE
) != 0) {
1309 // Get variable "certdb".
1311 DbName
= EFI_CERT_DB_NAME
;
1314 // Get variable "certdbv".
1316 DbName
= EFI_CERT_DB_VOLATILE_NAME
;
1320 // Get variable "certdb" or "certdbv".
1322 Status
= AuthServiceInternalFindVariable (
1328 if (EFI_ERROR (Status
)) {
1332 if ((DataSize
== 0) || (Data
== NULL
)) {
1334 return EFI_NOT_FOUND
;
1337 Status
= FindCertsFromDb (
1348 if (EFI_ERROR (Status
)) {
1352 *CertData
= Data
+ CertOffset
;
1357 Delete matching signer's certificates when deleting common authenticated
1358 variable by corresponding VariableName and VendorGuid from "certdb" or
1359 "certdbv" according to authenticated variable attributes.
1361 @param[in] VariableName Name of authenticated Variable.
1362 @param[in] VendorGuid Vendor GUID of authenticated Variable.
1363 @param[in] Attributes Attributes of authenticated variable.
1365 @retval EFI_INVALID_PARAMETER Any input parameter is invalid.
1366 @retval EFI_NOT_FOUND Fail to find "certdb"/"certdbv" or matching certs.
1367 @retval EFI_OUT_OF_RESOURCES The operation is failed due to lack of resources.
1368 @retval EFI_SUCCESS The operation is completed successfully.
1373 IN CHAR16
*VariableName
,
1374 IN EFI_GUID
*VendorGuid
,
1375 IN UINT32 Attributes
1382 UINT32 CertNodeOffset
;
1383 UINT32 CertNodeSize
;
1385 UINT32 NewCertDbSize
;
1388 if ((VariableName
== NULL
) || (VendorGuid
== NULL
)) {
1389 return EFI_INVALID_PARAMETER
;
1392 if ((Attributes
& EFI_VARIABLE_NON_VOLATILE
) != 0) {
1394 // Get variable "certdb".
1396 DbName
= EFI_CERT_DB_NAME
;
1397 VarAttr
= EFI_VARIABLE_NON_VOLATILE
| EFI_VARIABLE_RUNTIME_ACCESS
| EFI_VARIABLE_BOOTSERVICE_ACCESS
| EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS
;
1400 // Get variable "certdbv".
1402 DbName
= EFI_CERT_DB_VOLATILE_NAME
;
1403 VarAttr
= EFI_VARIABLE_RUNTIME_ACCESS
| EFI_VARIABLE_BOOTSERVICE_ACCESS
| EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS
;
1406 Status
= AuthServiceInternalFindVariable (
1413 if (EFI_ERROR (Status
)) {
1417 if ((DataSize
== 0) || (Data
== NULL
)) {
1419 return EFI_NOT_FOUND
;
1422 if (DataSize
== sizeof (UINT32
)) {
1424 // There is no certs in "certdb" or "certdbv".
1430 // Get corresponding cert node from "certdb" or "certdbv".
1432 Status
= FindCertsFromDb (
1443 if (EFI_ERROR (Status
)) {
1447 if (DataSize
< (CertNodeOffset
+ CertNodeSize
)) {
1448 return EFI_NOT_FOUND
;
1452 // Construct new data content of variable "certdb" or "certdbv".
1454 NewCertDbSize
= (UINT32
) DataSize
- CertNodeSize
;
1455 NewCertDb
= (UINT8
*) mCertDbStore
;
1458 // Copy the DB entries before deleting node.
1460 CopyMem (NewCertDb
, Data
, CertNodeOffset
);
1462 // Update CertDbListSize.
1464 CopyMem (NewCertDb
, &NewCertDbSize
, sizeof (UINT32
));
1466 // Copy the DB entries after deleting node.
1468 if (DataSize
> (CertNodeOffset
+ CertNodeSize
)) {
1470 NewCertDb
+ CertNodeOffset
,
1471 Data
+ CertNodeOffset
+ CertNodeSize
,
1472 DataSize
- CertNodeOffset
- CertNodeSize
1477 // Set "certdb" or "certdbv".
1479 Status
= AuthServiceInternalUpdateVariable (
1491 Insert signer's certificates for common authenticated variable with VariableName
1492 and VendorGuid in AUTH_CERT_DB_DATA to "certdb" or "certdbv" according to
1493 time based authenticated variable attributes. CertData is the SHA256 digest of
1494 SignerCert CommonName + TopLevelCert tbsCertificate.
1496 @param[in] VariableName Name of authenticated Variable.
1497 @param[in] VendorGuid Vendor GUID of authenticated Variable.
1498 @param[in] Attributes Attributes of authenticated variable.
1499 @param[in] SignerCert Signer certificate data.
1500 @param[in] SignerCertSize Length of signer certificate.
1501 @param[in] TopLevelCert Top-level certificate data.
1502 @param[in] TopLevelCertSize Length of top-level certificate.
1504 @retval EFI_INVALID_PARAMETER Any input parameter is invalid.
1505 @retval EFI_ACCESS_DENIED An AUTH_CERT_DB_DATA entry with same VariableName
1506 and VendorGuid already exists.
1507 @retval EFI_OUT_OF_RESOURCES The operation is failed due to lack of resources.
1508 @retval EFI_SUCCESS Insert an AUTH_CERT_DB_DATA entry to "certdb" or "certdbv"
1513 IN CHAR16
*VariableName
,
1514 IN EFI_GUID
*VendorGuid
,
1515 IN UINT32 Attributes
,
1516 IN UINT8
*SignerCert
,
1517 IN UINTN SignerCertSize
,
1518 IN UINT8
*TopLevelCert
,
1519 IN UINTN TopLevelCertSize
1527 UINT32 NewCertDbSize
;
1528 UINT32 CertNodeSize
;
1530 UINT32 CertDataSize
;
1531 AUTH_CERT_DB_DATA
*Ptr
;
1533 UINT8 Sha256Digest
[SHA256_DIGEST_SIZE
];
1535 if ((VariableName
== NULL
) || (VendorGuid
== NULL
) || (SignerCert
== NULL
) ||(TopLevelCert
== NULL
)) {
1536 return EFI_INVALID_PARAMETER
;
1539 if ((Attributes
& EFI_VARIABLE_NON_VOLATILE
) != 0) {
1541 // Get variable "certdb".
1543 DbName
= EFI_CERT_DB_NAME
;
1544 VarAttr
= EFI_VARIABLE_NON_VOLATILE
| EFI_VARIABLE_RUNTIME_ACCESS
| EFI_VARIABLE_BOOTSERVICE_ACCESS
| EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS
;
1547 // Get variable "certdbv".
1549 DbName
= EFI_CERT_DB_VOLATILE_NAME
;
1550 VarAttr
= EFI_VARIABLE_RUNTIME_ACCESS
| EFI_VARIABLE_BOOTSERVICE_ACCESS
| EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS
;
1554 // Get variable "certdb" or "certdbv".
1556 Status
= AuthServiceInternalFindVariable (
1562 if (EFI_ERROR (Status
)) {
1566 if ((DataSize
== 0) || (Data
== NULL
)) {
1568 return EFI_NOT_FOUND
;
1572 // Find whether matching cert node already exists in "certdb" or "certdbv".
1573 // If yes return error.
1575 Status
= FindCertsFromDb (
1586 if (!EFI_ERROR (Status
)) {
1588 return EFI_ACCESS_DENIED
;
1592 // Construct new data content of variable "certdb" or "certdbv".
1594 NameSize
= (UINT32
) StrLen (VariableName
);
1595 CertDataSize
= sizeof(Sha256Digest
);
1596 CertNodeSize
= sizeof (AUTH_CERT_DB_DATA
) + (UINT32
) CertDataSize
+ NameSize
* sizeof (CHAR16
);
1597 NewCertDbSize
= (UINT32
) DataSize
+ CertNodeSize
;
1598 if (NewCertDbSize
> mMaxCertDbSize
) {
1599 return EFI_OUT_OF_RESOURCES
;
1602 Status
= CalculatePrivAuthVarSignChainSHA256Digest(
1609 if (EFI_ERROR (Status
)) {
1613 NewCertDb
= (UINT8
*) mCertDbStore
;
1616 // Copy the DB entries before inserting node.
1618 CopyMem (NewCertDb
, Data
, DataSize
);
1620 // Update CertDbListSize.
1622 CopyMem (NewCertDb
, &NewCertDbSize
, sizeof (UINT32
));
1624 // Construct new cert node.
1626 Ptr
= (AUTH_CERT_DB_DATA
*) (NewCertDb
+ DataSize
);
1627 CopyGuid (&Ptr
->VendorGuid
, VendorGuid
);
1628 CopyMem (&Ptr
->CertNodeSize
, &CertNodeSize
, sizeof (UINT32
));
1629 CopyMem (&Ptr
->NameSize
, &NameSize
, sizeof (UINT32
));
1630 CopyMem (&Ptr
->CertDataSize
, &CertDataSize
, sizeof (UINT32
));
1633 (UINT8
*) Ptr
+ sizeof (AUTH_CERT_DB_DATA
),
1635 NameSize
* sizeof (CHAR16
)
1639 (UINT8
*) Ptr
+ sizeof (AUTH_CERT_DB_DATA
) + NameSize
* sizeof (CHAR16
),
1645 // Set "certdb" or "certdbv".
1647 Status
= AuthServiceInternalUpdateVariable (
1659 Clean up signer's certificates for common authenticated variable
1660 by corresponding VariableName and VendorGuid from "certdb".
1661 System may break down during Timebased Variable update & certdb update,
1662 make them inconsistent, this function is called in AuthVariable Init
1663 to ensure consistency.
1665 @retval EFI_NOT_FOUND Fail to find variable "certdb".
1666 @retval EFI_OUT_OF_RESOURCES The operation is failed due to lack of resources.
1667 @retval EFI_SUCCESS The operation is completed successfully.
1676 AUTH_CERT_DB_DATA
*Ptr
;
1679 CHAR16
*VariableName
;
1681 BOOLEAN CertCleaned
;
1684 EFI_GUID AuthVarGuid
;
1685 AUTH_VARIABLE_INFO AuthVariableInfo
;
1687 Status
= EFI_SUCCESS
;
1690 // Get corresponding certificates by VendorGuid and VariableName.
1693 CertCleaned
= FALSE
;
1696 // Get latest variable "certdb"
1698 Status
= AuthServiceInternalFindVariable (
1704 if (EFI_ERROR (Status
)) {
1708 if ((DataSize
== 0) || (Data
== NULL
)) {
1710 return EFI_NOT_FOUND
;
1713 Offset
= sizeof (UINT32
);
1715 while (Offset
< (UINT32
) DataSize
) {
1716 Ptr
= (AUTH_CERT_DB_DATA
*) (Data
+ Offset
);
1717 NodeSize
= ReadUnaligned32 (&Ptr
->CertNodeSize
);
1718 NameSize
= ReadUnaligned32 (&Ptr
->NameSize
);
1721 // Get VarName tailed with '\0'
1723 VariableName
= AllocateZeroPool((NameSize
+ 1) * sizeof(CHAR16
));
1724 if (VariableName
== NULL
) {
1725 return EFI_OUT_OF_RESOURCES
;
1727 CopyMem (VariableName
, (UINT8
*) Ptr
+ sizeof (AUTH_CERT_DB_DATA
), NameSize
* sizeof(CHAR16
));
1729 // Keep VarGuid aligned
1731 CopyMem (&AuthVarGuid
, &Ptr
->VendorGuid
, sizeof(EFI_GUID
));
1734 // Find corresponding time auth variable
1736 ZeroMem (&AuthVariableInfo
, sizeof (AuthVariableInfo
));
1737 Status
= mAuthVarLibContextIn
->FindVariable (
1743 if (EFI_ERROR(Status
) || (AuthVariableInfo
.Attributes
& EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS
) == 0) {
1744 Status
= DeleteCertsFromDb(
1747 AuthVariableInfo
.Attributes
1750 DEBUG((EFI_D_INFO
, "Recovery!! Cert for Auth Variable %s Guid %g is removed for consistency\n", VariableName
, &AuthVarGuid
));
1751 FreePool(VariableName
);
1755 FreePool(VariableName
);
1756 Offset
= Offset
+ NodeSize
;
1758 } while (CertCleaned
);
1764 Process variable with EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS set
1766 Caution: This function may receive untrusted input.
1767 This function may be invoked in SMM mode, and datasize and data are external input.
1768 This function will do basic validation, before parse the data.
1769 This function will parse the authentication carefully to avoid security issues, like
1770 buffer overflow, integer overflow.
1772 @param[in] VariableName Name of Variable to be found.
1773 @param[in] VendorGuid Variable vendor GUID.
1774 @param[in] Data Data pointer.
1775 @param[in] DataSize Size of Data found. If size is less than the
1776 data, this value contains the required size.
1777 @param[in] Attributes Attribute value of the variable.
1778 @param[in] AuthVarType Verify against PK, KEK database, private database or certificate in data payload.
1779 @param[in] OrgTimeStamp Pointer to original time stamp,
1780 original variable is not found if NULL.
1781 @param[out] VarPayloadPtr Pointer to variable payload address.
1782 @param[out] VarPayloadSize Pointer to variable payload size.
1784 @retval EFI_INVALID_PARAMETER Invalid parameter.
1785 @retval EFI_SECURITY_VIOLATION The variable does NOT pass the validation
1786 check carried out by the firmware.
1787 @retval EFI_OUT_OF_RESOURCES Failed to process variable due to lack
1789 @retval EFI_SUCCESS Variable pass validation successfully.
1793 VerifyTimeBasedPayload (
1794 IN CHAR16
*VariableName
,
1795 IN EFI_GUID
*VendorGuid
,
1798 IN UINT32 Attributes
,
1799 IN AUTHVAR_TYPE AuthVarType
,
1800 IN EFI_TIME
*OrgTimeStamp
,
1801 OUT UINT8
**VarPayloadPtr
,
1802 OUT UINTN
*VarPayloadSize
1805 EFI_VARIABLE_AUTHENTICATION_2
*CertData
;
1811 BOOLEAN VerifyStatus
;
1813 EFI_SIGNATURE_LIST
*CertList
;
1814 EFI_SIGNATURE_DATA
*Cert
;
1822 UINT8
*TopLevelCert
;
1823 UINTN TopLevelCertSize
;
1825 UINTN TrustedCertSize
;
1827 UINTN CertStackSize
;
1828 UINT8
*CertsInCertDb
;
1829 UINT32 CertsSizeinDb
;
1830 UINT8 Sha256Digest
[SHA256_DIGEST_SIZE
];
1831 EFI_CERT_DATA
*CertDataPtr
;
1834 // 1. TopLevelCert is the top-level issuer certificate in signature Signer Cert Chain
1835 // 2. TrustedCert is the certificate which firmware trusts. It could be saved in protected
1836 // storage or PK payload on PK init
1838 VerifyStatus
= FALSE
;
1843 TopLevelCert
= NULL
;
1844 CertsInCertDb
= NULL
;
1848 // When the attribute EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS is
1849 // set, then the Data buffer shall begin with an instance of a complete (and serialized)
1850 // EFI_VARIABLE_AUTHENTICATION_2 descriptor. The descriptor shall be followed by the new
1851 // variable value and DataSize shall reflect the combined size of the descriptor and the new
1852 // variable value. The authentication descriptor is not part of the variable data and is not
1853 // returned by subsequent calls to GetVariable().
1855 CertData
= (EFI_VARIABLE_AUTHENTICATION_2
*) Data
;
1858 // Verify that Pad1, Nanosecond, TimeZone, Daylight and Pad2 components of the
1859 // TimeStamp value are set to zero.
1861 if ((CertData
->TimeStamp
.Pad1
!= 0) ||
1862 (CertData
->TimeStamp
.Nanosecond
!= 0) ||
1863 (CertData
->TimeStamp
.TimeZone
!= 0) ||
1864 (CertData
->TimeStamp
.Daylight
!= 0) ||
1865 (CertData
->TimeStamp
.Pad2
!= 0)) {
1866 return EFI_SECURITY_VIOLATION
;
1869 if ((OrgTimeStamp
!= NULL
) && ((Attributes
& EFI_VARIABLE_APPEND_WRITE
) == 0)) {
1870 if (AuthServiceInternalCompareTimeStamp (&CertData
->TimeStamp
, OrgTimeStamp
)) {
1872 // TimeStamp check fail, suspicious replay attack, return EFI_SECURITY_VIOLATION.
1874 return EFI_SECURITY_VIOLATION
;
1879 // wCertificateType should be WIN_CERT_TYPE_EFI_GUID.
1880 // Cert type should be EFI_CERT_TYPE_PKCS7_GUID.
1882 if ((CertData
->AuthInfo
.Hdr
.wCertificateType
!= WIN_CERT_TYPE_EFI_GUID
) ||
1883 !CompareGuid (&CertData
->AuthInfo
.CertType
, &gEfiCertPkcs7Guid
)) {
1885 // Invalid AuthInfo type, return EFI_SECURITY_VIOLATION.
1887 return EFI_SECURITY_VIOLATION
;
1891 // Find out Pkcs7 SignedData which follows the EFI_VARIABLE_AUTHENTICATION_2 descriptor.
1892 // AuthInfo.Hdr.dwLength is the length of the entire certificate, including the length of the header.
1894 SigData
= CertData
->AuthInfo
.CertData
;
1895 SigDataSize
= CertData
->AuthInfo
.Hdr
.dwLength
- (UINT32
) (OFFSET_OF (WIN_CERTIFICATE_UEFI_GUID
, CertData
));
1898 // SignedData.digestAlgorithms shall contain the digest algorithm used when preparing the
1899 // signature. Only a digest algorithm of SHA-256 is accepted.
1901 // According to PKCS#7 Definition:
1902 // SignedData ::= SEQUENCE {
1904 // digestAlgorithms DigestAlgorithmIdentifiers,
1905 // contentInfo ContentInfo,
1907 // The DigestAlgorithmIdentifiers can be used to determine the hash algorithm
1908 // in VARIABLE_AUTHENTICATION_2 descriptor.
1909 // This field has the fixed offset (+13) and be calculated based on two bytes of length encoding.
1911 if ((Attributes
& EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS
) != 0) {
1912 if (SigDataSize
>= (13 + sizeof (mSha256OidValue
))) {
1913 if (((*(SigData
+ 1) & TWO_BYTE_ENCODE
) != TWO_BYTE_ENCODE
) ||
1914 (CompareMem (SigData
+ 13, &mSha256OidValue
, sizeof (mSha256OidValue
)) != 0)) {
1915 return EFI_SECURITY_VIOLATION
;
1921 // Find out the new data payload which follows Pkcs7 SignedData directly.
1923 PayloadPtr
= SigData
+ SigDataSize
;
1924 PayloadSize
= DataSize
- OFFSET_OF_AUTHINFO2_CERT_DATA
- (UINTN
) SigDataSize
;
1927 // Construct a serialization buffer of the values of the VariableName, VendorGuid and Attributes
1928 // parameters of the SetVariable() call and the TimeStamp component of the
1929 // EFI_VARIABLE_AUTHENTICATION_2 descriptor followed by the variable's new value
1930 // i.e. (VariableName, VendorGuid, Attributes, TimeStamp, Data)
1932 NewDataSize
= PayloadSize
+ sizeof (EFI_TIME
) + sizeof (UINT32
) +
1933 sizeof (EFI_GUID
) + StrSize (VariableName
) - sizeof (CHAR16
);
1936 // Here is to reuse scratch data area(at the end of volatile variable store)
1937 // to reduce SMRAM consumption for SMM variable driver.
1938 // The scratch buffer is enough to hold the serialized data and safe to use,
1939 // because it is only used at here to do verification temporarily first
1940 // and then used in UpdateVariable() for a time based auth variable set.
1942 Status
= mAuthVarLibContextIn
->GetScratchBuffer (&NewDataSize
, (VOID
**) &NewData
);
1943 if (EFI_ERROR (Status
)) {
1944 return EFI_OUT_OF_RESOURCES
;
1948 Length
= StrLen (VariableName
) * sizeof (CHAR16
);
1949 CopyMem (Buffer
, VariableName
, Length
);
1952 Length
= sizeof (EFI_GUID
);
1953 CopyMem (Buffer
, VendorGuid
, Length
);
1956 Length
= sizeof (UINT32
);
1957 CopyMem (Buffer
, &Attr
, Length
);
1960 Length
= sizeof (EFI_TIME
);
1961 CopyMem (Buffer
, &CertData
->TimeStamp
, Length
);
1964 CopyMem (Buffer
, PayloadPtr
, PayloadSize
);
1966 if (AuthVarType
== AuthVarTypePk
) {
1968 // Verify that the signature has been made with the current Platform Key (no chaining for PK).
1969 // First, get signer's certificates from SignedData.
1971 VerifyStatus
= Pkcs7GetSigners (
1979 if (!VerifyStatus
) {
1984 // Second, get the current platform key from variable. Check whether it's identical with signer's certificates
1985 // in SignedData. If not, return error immediately.
1987 Status
= AuthServiceInternalFindVariable (
1988 EFI_PLATFORM_KEY_NAME
,
1989 &gEfiGlobalVariableGuid
,
1993 if (EFI_ERROR (Status
)) {
1994 VerifyStatus
= FALSE
;
1997 CertList
= (EFI_SIGNATURE_LIST
*) Data
;
1998 Cert
= (EFI_SIGNATURE_DATA
*) ((UINT8
*) CertList
+ sizeof (EFI_SIGNATURE_LIST
) + CertList
->SignatureHeaderSize
);
1999 if ((TopLevelCertSize
!= (CertList
->SignatureSize
- (sizeof (EFI_SIGNATURE_DATA
) - 1))) ||
2000 (CompareMem (Cert
->SignatureData
, TopLevelCert
, TopLevelCertSize
) != 0)) {
2001 VerifyStatus
= FALSE
;
2006 // Verify Pkcs7 SignedData via Pkcs7Verify library.
2008 VerifyStatus
= Pkcs7Verify (
2017 } else if (AuthVarType
== AuthVarTypeKek
) {
2020 // Get KEK database from variable.
2022 Status
= AuthServiceInternalFindVariable (
2023 EFI_KEY_EXCHANGE_KEY_NAME
,
2024 &gEfiGlobalVariableGuid
,
2028 if (EFI_ERROR (Status
)) {
2033 // Ready to verify Pkcs7 SignedData. Go through KEK Signature Database to find out X.509 CertList.
2035 KekDataSize
= (UINT32
) DataSize
;
2036 CertList
= (EFI_SIGNATURE_LIST
*) Data
;
2037 while ((KekDataSize
> 0) && (KekDataSize
>= CertList
->SignatureListSize
)) {
2038 if (CompareGuid (&CertList
->SignatureType
, &gEfiCertX509Guid
)) {
2039 Cert
= (EFI_SIGNATURE_DATA
*) ((UINT8
*) CertList
+ sizeof (EFI_SIGNATURE_LIST
) + CertList
->SignatureHeaderSize
);
2040 CertCount
= (CertList
->SignatureListSize
- sizeof (EFI_SIGNATURE_LIST
) - CertList
->SignatureHeaderSize
) / CertList
->SignatureSize
;
2041 for (Index
= 0; Index
< CertCount
; Index
++) {
2043 // Iterate each Signature Data Node within this CertList for a verify
2045 TrustedCert
= Cert
->SignatureData
;
2046 TrustedCertSize
= CertList
->SignatureSize
- (sizeof (EFI_SIGNATURE_DATA
) - 1);
2049 // Verify Pkcs7 SignedData via Pkcs7Verify library.
2051 VerifyStatus
= Pkcs7Verify (
2062 Cert
= (EFI_SIGNATURE_DATA
*) ((UINT8
*) Cert
+ CertList
->SignatureSize
);
2065 KekDataSize
-= CertList
->SignatureListSize
;
2066 CertList
= (EFI_SIGNATURE_LIST
*) ((UINT8
*) CertList
+ CertList
->SignatureListSize
);
2068 } else if (AuthVarType
== AuthVarTypePriv
) {
2071 // Process common authenticated variable except PK/KEK/DB/DBX/DBT.
2072 // Get signer's certificates from SignedData.
2074 VerifyStatus
= Pkcs7GetSigners (
2082 if (!VerifyStatus
) {
2087 // Get previously stored signer's certificates from certdb or certdbv for existing
2088 // variable. Check whether they are identical with signer's certificates
2089 // in SignedData. If not, return error immediately.
2091 if (OrgTimeStamp
!= NULL
) {
2092 VerifyStatus
= FALSE
;
2094 Status
= GetCertsFromDb (VariableName
, VendorGuid
, Attributes
, &CertsInCertDb
, &CertsSizeinDb
);
2095 if (EFI_ERROR (Status
)) {
2099 if (CertsSizeinDb
== SHA256_DIGEST_SIZE
) {
2101 // Check hash of signer cert CommonName + Top-level issuer tbsCertificate against data in CertDb
2103 CertDataPtr
= (EFI_CERT_DATA
*)(SignerCerts
+ 1);
2104 Status
= CalculatePrivAuthVarSignChainSHA256Digest(
2105 CertDataPtr
->CertDataBuffer
,
2106 ReadUnaligned32 ((UINT32
*)&(CertDataPtr
->CertDataLength
)),
2111 if (EFI_ERROR(Status
) || CompareMem (Sha256Digest
, CertsInCertDb
, CertsSizeinDb
) != 0){
2116 // Keep backward compatible with previous solution which saves whole signer certs stack in CertDb
2118 if ((CertStackSize
!= CertsSizeinDb
) ||
2119 (CompareMem (SignerCerts
, CertsInCertDb
, CertsSizeinDb
) != 0)) {
2125 VerifyStatus
= Pkcs7Verify (
2133 if (!VerifyStatus
) {
2137 if ((OrgTimeStamp
== NULL
) && (PayloadSize
!= 0)) {
2139 // When adding a new common authenticated variable, always save Hash of cn of signer cert + tbsCertificate of Top-level issuer
2141 CertDataPtr
= (EFI_CERT_DATA
*)(SignerCerts
+ 1);
2142 Status
= InsertCertsToDb (
2146 CertDataPtr
->CertDataBuffer
,
2147 ReadUnaligned32 ((UINT32
*)&(CertDataPtr
->CertDataLength
)),
2151 if (EFI_ERROR (Status
)) {
2152 VerifyStatus
= FALSE
;
2156 } else if (AuthVarType
== AuthVarTypePayload
) {
2157 CertList
= (EFI_SIGNATURE_LIST
*) PayloadPtr
;
2158 Cert
= (EFI_SIGNATURE_DATA
*) ((UINT8
*) CertList
+ sizeof (EFI_SIGNATURE_LIST
) + CertList
->SignatureHeaderSize
);
2159 TrustedCert
= Cert
->SignatureData
;
2160 TrustedCertSize
= CertList
->SignatureSize
- (sizeof (EFI_SIGNATURE_DATA
) - 1);
2162 // Verify Pkcs7 SignedData via Pkcs7Verify library.
2164 VerifyStatus
= Pkcs7Verify (
2173 return EFI_SECURITY_VIOLATION
;
2178 if (AuthVarType
== AuthVarTypePk
|| AuthVarType
== AuthVarTypePriv
) {
2179 Pkcs7FreeSigners (TopLevelCert
);
2180 Pkcs7FreeSigners (SignerCerts
);
2183 if (!VerifyStatus
) {
2184 return EFI_SECURITY_VIOLATION
;
2187 Status
= CheckSignatureListFormat(VariableName
, VendorGuid
, PayloadPtr
, PayloadSize
);
2188 if (EFI_ERROR (Status
)) {
2192 *VarPayloadPtr
= PayloadPtr
;
2193 *VarPayloadSize
= PayloadSize
;
2199 Process variable with EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS set
2201 Caution: This function may receive untrusted input.
2202 This function may be invoked in SMM mode, and datasize and data are external input.
2203 This function will do basic validation, before parse the data.
2204 This function will parse the authentication carefully to avoid security issues, like
2205 buffer overflow, integer overflow.
2207 @param[in] VariableName Name of Variable to be found.
2208 @param[in] VendorGuid Variable vendor GUID.
2209 @param[in] Data Data pointer.
2210 @param[in] DataSize Size of Data found. If size is less than the
2211 data, this value contains the required size.
2212 @param[in] Attributes Attribute value of the variable.
2213 @param[in] AuthVarType Verify against PK, KEK database, private database or certificate in data payload.
2214 @param[out] VarDel Delete the variable or not.
2216 @retval EFI_INVALID_PARAMETER Invalid parameter.
2217 @retval EFI_SECURITY_VIOLATION The variable does NOT pass the validation
2218 check carried out by the firmware.
2219 @retval EFI_OUT_OF_RESOURCES Failed to process variable due to lack
2221 @retval EFI_SUCCESS Variable pass validation successfully.
2225 VerifyTimeBasedPayloadAndUpdate (
2226 IN CHAR16
*VariableName
,
2227 IN EFI_GUID
*VendorGuid
,
2230 IN UINT32 Attributes
,
2231 IN AUTHVAR_TYPE AuthVarType
,
2236 EFI_STATUS FindStatus
;
2239 EFI_VARIABLE_AUTHENTICATION_2
*CertData
;
2240 AUTH_VARIABLE_INFO OrgVariableInfo
;
2243 ZeroMem (&OrgVariableInfo
, sizeof (OrgVariableInfo
));
2244 FindStatus
= mAuthVarLibContextIn
->FindVariable (
2250 Status
= VerifyTimeBasedPayload (
2257 (!EFI_ERROR (FindStatus
)) ? OrgVariableInfo
.TimeStamp
: NULL
,
2261 if (EFI_ERROR (Status
)) {
2265 if (!EFI_ERROR(FindStatus
)
2266 && (PayloadSize
== 0)
2267 && ((Attributes
& EFI_VARIABLE_APPEND_WRITE
) == 0)) {
2273 CertData
= (EFI_VARIABLE_AUTHENTICATION_2
*) Data
;
2276 // Final step: Update/Append Variable if it pass Pkcs7Verify
2278 Status
= AuthServiceInternalUpdateVariableWithTimeStamp (
2284 &CertData
->TimeStamp
2288 // Delete signer's certificates when delete the common authenticated variable.
2290 if (IsDel
&& AuthVarType
== AuthVarTypePriv
&& !EFI_ERROR(Status
) ) {
2291 Status
= DeleteCertsFromDb (VariableName
, VendorGuid
, Attributes
);
2294 if (VarDel
!= NULL
) {
2295 if (IsDel
&& !EFI_ERROR(Status
)) {