[mirror_edk2.git] / SecurityPkg / VariableAuthenticated / RuntimeDxe / AuthService.h

/** @file\r
  The internal header file includes the common header files, defines\r
  internal structure and functions used by AuthService module.\r
\r
  Caution: This module requires additional review when modified.\r
  This driver will have external input - variable data. It may be input in SMM mode.\r
  This external input must be validated carefully to avoid security issue like\r
  buffer overflow, integer overflow.\r
  Variable attribute should also be checked to avoid authentication bypass.\r
     The whole SMM authentication variable design relies on the integrity of flash part and SMM.\r
  which is assumed to be protected by platform.  All variable code and metadata in flash/SMM Memory\r
  may not be modified without authorization. If platform fails to protect these resources, \r
  the authentication service provided in this driver will be broken, and the behavior is undefined.\r
\r
Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>\r
This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
which accompanies this distribution.  The full text of the license may be found at\r
http://opensource.org/licenses/bsd-license.php\r
\r
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#ifndef _AUTHSERVICE_H_\r
#define _AUTHSERVICE_H_\r
\r
#define EFI_CERT_TYPE_RSA2048_SHA256_SIZE 256\r
#define EFI_CERT_TYPE_RSA2048_SIZE        256\r
\r
///\r
/// Size of AuthInfo prior to the data payload.\r
///\r
#define AUTHINFO_SIZE ((OFFSET_OF (EFI_VARIABLE_AUTHENTICATION, AuthInfo)) + \\r
                       (OFFSET_OF (WIN_CERTIFICATE_UEFI_GUID, CertData)) + \\r
                       sizeof (EFI_CERT_BLOCK_RSA_2048_SHA256))\r
\r
#define AUTHINFO2_SIZE(VarAuth2) ((OFFSET_OF (EFI_VARIABLE_AUTHENTICATION_2, AuthInfo)) + \\r
                                  (UINTN) ((EFI_VARIABLE_AUTHENTICATION_2 *) (VarAuth2))->AuthInfo.Hdr.dwLength)\r
\r
#define OFFSET_OF_AUTHINFO2_CERT_DATA ((OFFSET_OF (EFI_VARIABLE_AUTHENTICATION_2, AuthInfo)) + \\r
                                       (OFFSET_OF (WIN_CERTIFICATE_UEFI_GUID, CertData)))\r
\r
///\r
/// "AuthVarKeyDatabase" variable for the Public Key store.\r
///\r
#define AUTHVAR_KEYDB_NAME      L"AuthVarKeyDatabase"\r
\r
///\r
/// "certdb" variable stores the signer's certificates for non PK/KEK/DB/DBX\r
/// variables with EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS set.\r
/// \r
///\r
#define EFI_CERT_DB_NAME        L"certdb"\r
\r
///\r
/// Struct to record signature requirement defined by UEFI spec.\r
/// For SigHeaderSize and SigDataSize, ((UINT32) ~0) means NO exact length requirement for this field.\r
///\r
typedef struct {\r
  EFI_GUID    SigType;\r
  // Expected SignatureHeader size in Bytes.\r
  UINT32      SigHeaderSize;\r
  // Expected SignatureData size in Bytes.\r
  UINT32      SigDataSize;\r
} EFI_SIGNATURE_ITEM;\r
\r
typedef enum {\r
  AuthVarTypePk,\r
  AuthVarTypeKek,\r
  AuthVarTypePriv,\r
  AuthVarTypePayload\r
} AUTHVAR_TYPE;\r
\r
#pragma pack(1)\r
typedef struct {\r
  EFI_GUID    VendorGuid;\r
  UINT32      CertNodeSize;\r
  UINT32      NameSize;\r
  UINT32      CertDataSize;\r
  /// CHAR16  VariableName[NameSize];\r
  /// UINT8   CertData[CertDataSize];\r
} AUTH_CERT_DB_DATA;\r
#pragma pack()\r
\r
/**\r
  Process variable with EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS/EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS set.\r
\r
  Caution: This function may receive untrusted input.\r
  This function may be invoked in SMM mode, and datasize and data are external input.\r
  This function will do basic validation, before parse the data.\r
  This function will parse the authentication carefully to avoid security issues, like\r
  buffer overflow, integer overflow.\r
  This function will check attribute carefully to avoid authentication bypass.\r
\r
  @param[in]  VariableName                Name of Variable to be found.\r
  @param[in]  VendorGuid                  Variable vendor GUID.\r
\r
  @param[in]  Data                        Data pointer.\r
  @param[in]  DataSize                    Size of Data found. If size is less than the\r
                                          data, this value contains the required size.\r
  @param[in]  Variable                    The variable information which is used to keep track of variable usage.\r
  @param[in]  Attributes                  Attribute value of the variable.\r
\r
  @return EFI_INVALID_PARAMETER           Invalid parameter\r
  @return EFI_WRITE_PROTECTED             Variable is write-protected and needs authentication with\r
                                          EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS set.\r
  @return EFI_SECURITY_VIOLATION          The variable is with EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS\r
                                          set, but the AuthInfo does NOT pass the validation\r
                                          check carried out by the firmware.\r
  @return EFI_SUCCESS                     Variable is not write-protected, or passed validation successfully.\r
\r
**/\r
EFI_STATUS\r
ProcessVariable (\r
  IN     CHAR16                             *VariableName,\r
  IN     EFI_GUID                           *VendorGuid,\r
  IN     VOID                               *Data,\r
  IN     UINTN                              DataSize,\r
  IN     VARIABLE_POINTER_TRACK             *Variable,\r
  IN     UINT32                             Attributes\r
  );\r
\r
/**\r
  Update platform mode.\r
\r
  @param[in]      Mode                    SETUP_MODE or USER_MODE.\r
\r
  @return EFI_INVALID_PARAMETER           Invalid parameter.\r
  @return EFI_SUCCESS                     Update platform mode successfully.\r
\r
**/\r
EFI_STATUS\r
UpdatePlatformMode (\r
  IN  UINT32                    Mode\r
  );\r
\r
/**\r
  Initializes for authenticated varibale service.\r
\r
  @retval EFI_SUCCESS           Function successfully executed.\r
  @retval EFI_OUT_OF_RESOURCES  Fail to allocate enough memory resource.\r
\r
**/\r
EFI_STATUS\r
AutenticatedVariableServiceInitialize (\r
  VOID\r
  );\r
\r
/**\r
  Initializes for cryptlib service before use, include register algrithm and allocate scratch.\r
\r
**/\r
VOID\r
CryptLibraryInitialize (\r
  VOID\r
  );\r
\r
/**\r
  Check input data form to make sure it is a valid EFI_SIGNATURE_LIST for PK/KEK variable.\r
\r
  @param[in]  VariableName                Name of Variable to be check.\r
  @param[in]  VendorGuid                  Variable vendor GUID.\r
  @param[in]  Data                        Point to the variable data to be checked.\r
  @param[in]  DataSize                    Size of Data.\r
\r
  @return EFI_INVALID_PARAMETER           Invalid signature list format.\r
  @return EFI_SUCCESS                     Passed signature list format check successfully.\r
  \r
**/\r
EFI_STATUS\r
CheckSignatureListFormat(\r
  IN  CHAR16                    *VariableName,\r
  IN  EFI_GUID                  *VendorGuid,\r
  IN  VOID                      *Data,\r
  IN  UINTN                     DataSize\r
  );\r
\r
/**\r
  Process variable with platform key for verification.\r
\r
  Caution: This function may receive untrusted input.\r
  This function may be invoked in SMM mode, and datasize and data are external input.\r
  This function will do basic validation, before parse the data.\r
  This function will parse the authentication carefully to avoid security issues, like\r
  buffer overflow, integer overflow.\r
  This function will check attribute carefully to avoid authentication bypass.\r
\r
  @param[in]  VariableName                Name of Variable to be found.\r
  @param[in]  VendorGuid                  Variable vendor GUID.\r
  @param[in]  Data                        Data pointer.\r
  @param[in]  DataSize                    Size of Data found. If size is less than the\r
                                          data, this value contains the required size.\r
  @param[in]  Variable                    The variable information which is used to keep track of variable usage.\r
  @param[in]  Attributes                  Attribute value of the variable.\r
  @param[in]  IsPk                        Indicate whether it is to process pk.\r
\r
  @return EFI_INVALID_PARAMETER           Invalid parameter\r
  @return EFI_SECURITY_VIOLATION          The variable does NOT pass the validation\r
                                          check carried out by the firmware.\r
  @return EFI_SUCCESS                     Variable passed validation successfully.\r
\r
**/\r
EFI_STATUS\r
ProcessVarWithPk (\r
  IN  CHAR16                    *VariableName,\r
  IN  EFI_GUID                  *VendorGuid,\r
  IN  VOID                      *Data,\r
  IN  UINTN                     DataSize,\r
  IN  VARIABLE_POINTER_TRACK    *Variable,\r
  IN  UINT32                    Attributes OPTIONAL,\r
  IN  BOOLEAN                   IsPk\r
  );\r
\r
/**\r
  Process variable with key exchange key for verification.\r
\r
  Caution: This function may receive untrusted input.\r
  This function may be invoked in SMM mode, and datasize and data are external input.\r
  This function will do basic validation, before parse the data.\r
  This function will parse the authentication carefully to avoid security issues, like\r
  buffer overflow, integer overflow.\r
  This function will check attribute carefully to avoid authentication bypass.\r
\r
  @param[in]  VariableName                Name of Variable to be found.\r
  @param[in]  VendorGuid                  Variable vendor GUID.\r
  @param[in]  Data                        Data pointer.\r
  @param[in]  DataSize                    Size of Data found. If size is less than the\r
                                          data, this value contains the required size.\r
  @param[in]  Variable                    The variable information that is used to keep track of variable usage.\r
  @param[in]  Attributes                  Attribute value of the variable.\r
\r
  @return EFI_INVALID_PARAMETER           Invalid parameter.\r
  @return EFI_SECURITY_VIOLATION          The variable does NOT pass the validation\r
                                          check carried out by the firmware.\r
  @return EFI_SUCCESS                     Variable passed validation successfully.\r
\r
**/\r
EFI_STATUS\r
ProcessVarWithKek (\r
  IN  CHAR16                    *VariableName,\r
  IN  EFI_GUID                  *VendorGuid,\r
  IN  VOID                      *Data,\r
  IN  UINTN                     DataSize,\r
  IN  VARIABLE_POINTER_TRACK    *Variable,\r
  IN  UINT32                    Attributes OPTIONAL\r
  );\r
\r
/**\r
  Merge two buffers which formatted as EFI_SIGNATURE_LIST. Only the new EFI_SIGNATURE_DATA\r
  will be appended to the original EFI_SIGNATURE_LIST, duplicate EFI_SIGNATURE_DATA\r
  will be ignored.\r
\r
  @param[in, out]  Data             Pointer to original EFI_SIGNATURE_LIST.\r
  @param[in]       DataSize         Size of Data buffer.\r
  @param[in]       FreeBufSize      Size of free data buffer \r
  @param[in]       NewData          Pointer to new EFI_SIGNATURE_LIST to be appended.\r
  @param[in]       NewDataSize      Size of NewData buffer.\r
  @param[out]      MergedBufSize    Size of the merged buffer\r
\r
  @return EFI_BUFFER_TOO_SMALL if input Data buffer overflowed\r
\r
**/\r
EFI_STATUS\r
AppendSignatureList (\r
  IN  OUT VOID            *Data,\r
  IN  UINTN               DataSize,\r
  IN  UINTN               FreeBufSize,\r
  IN  VOID                *NewData,\r
  IN  UINTN               NewDataSize,\r
  OUT UINTN               *MergedBufSize\r
  );\r
\r
/**\r
  Compare two EFI_TIME data.\r
\r
\r
  @param FirstTime           A pointer to the first EFI_TIME data.\r
  @param SecondTime          A pointer to the second EFI_TIME data.\r
\r
  @retval  TRUE              The FirstTime is not later than the SecondTime.\r
  @retval  FALSE             The FirstTime is later than the SecondTime.\r
\r
**/\r
BOOLEAN\r
CompareTimeStamp (\r
  IN EFI_TIME               *FirstTime,\r
  IN EFI_TIME               *SecondTime\r
  );\r
\r
/**\r
  Delete matching signer's certificates when deleting common authenticated\r
  variable by corresponding VariableName and VendorGuid from "certdb".\r
\r
  @param[in]  VariableName   Name of authenticated Variable.\r
  @param[in]  VendorGuid     Vendor GUID of authenticated Variable.\r
\r
  @retval  EFI_INVALID_PARAMETER Any input parameter is invalid.\r
  @retval  EFI_NOT_FOUND         Fail to find "certdb" or matching certs.\r
  @retval  EFI_OUT_OF_RESOURCES  The operation is failed due to lack of resources.\r
  @retval  EFI_SUCCESS           The operation is completed successfully.\r
\r
**/\r
EFI_STATUS\r
DeleteCertsFromDb (\r
  IN     CHAR16           *VariableName,\r
  IN     EFI_GUID         *VendorGuid\r
  );\r
\r
/**\r
  Process variable with EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS set\r
\r
  Caution: This function may receive untrusted input.\r
  This function may be invoked in SMM mode, and datasize and data are external input.\r
  This function will do basic validation, before parse the data.\r
  This function will parse the authentication carefully to avoid security issues, like\r
  buffer overflow, integer overflow.\r
\r
  @param[in]  VariableName                Name of Variable to be found.\r
  @param[in]  VendorGuid                  Variable vendor GUID.\r
  @param[in]  Data                        Data pointer.\r
  @param[in]  DataSize                    Size of Data found. If size is less than the\r
                                          data, this value contains the required size.\r
  @param[in]  Variable                    The variable information which is used to keep track of variable usage.\r
  @param[in]  Attributes                  Attribute value of the variable.\r
  @param[in]  AuthVarType                 Verify against PK or KEK database or private database.\r
  @param[out] VarDel                      Delete the variable or not.\r
\r
  @retval EFI_INVALID_PARAMETER           Invalid parameter.\r
  @retval EFI_SECURITY_VIOLATION          The variable does NOT pass the validation\r
                                          check carried out by the firmware.\r
  @retval EFI_OUT_OF_RESOURCES            Failed to process variable due to lack\r
                                          of resources.\r
  @retval EFI_SUCCESS                     Variable pass validation successfully.\r
\r
**/\r
EFI_STATUS\r
VerifyTimeBasedPayload (\r
  IN     CHAR16                             *VariableName,\r
  IN     EFI_GUID                           *VendorGuid,\r
  IN     VOID                               *Data,\r
  IN     UINTN                              DataSize,\r
  IN     VARIABLE_POINTER_TRACK             *Variable,\r
  IN     UINT32                             Attributes,\r
  IN     AUTHVAR_TYPE                       AuthVarType,\r
  OUT    BOOLEAN                            *VarDel\r
  );\r
\r
extern UINT8  *mPubKeyStore;\r
extern UINT8  *mCertDbStore;\r
extern UINT32 mPubKeyNumber;\r
extern VOID   *mHashCtx;\r
\r
#endif\r
Commit	Line	Data
	1	/** @file\r
	2	The internal header file includes the common header files, defines\r
	3	internal structure and functions used by AuthService module.\r
	4	\r
	5	Caution: This module requires additional review when modified.\r
	6	This driver will have external input - variable data. It may be input in SMM mode.\r
	7	This external input must be validated carefully to avoid security issue like\r
	8	buffer overflow, integer overflow.\r
	9	Variable attribute should also be checked to avoid authentication bypass.\r
	10	The whole SMM authentication variable design relies on the integrity of flash part and SMM.\r
	11	which is assumed to be protected by platform. All variable code and metadata in flash/SMM Memory\r
	12	may not be modified without authorization. If platform fails to protect these resources, \r
	13	the authentication service provided in this driver will be broken, and the behavior is undefined.\r
	14	\r
	15	Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>\r
	16	This program and the accompanying materials\r
	17	are licensed and made available under the terms and conditions of the BSD License\r
	18	which accompanies this distribution. The full text of the license may be found at\r
	19	http://opensource.org/licenses/bsd-license.php\r
	20	\r
	21	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	22	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	23	\r
	24	**/\r
	25	\r
	26	#ifndef _AUTHSERVICE_H_\r
	27	#define _AUTHSERVICE_H_\r
	28	\r
	29	#define EFI_CERT_TYPE_RSA2048_SHA256_SIZE 256\r
	30	#define EFI_CERT_TYPE_RSA2048_SIZE 256\r
	31	\r
	32	///\r
	33	/// Size of AuthInfo prior to the data payload.\r
	34	///\r
	35	#define AUTHINFO_SIZE ((OFFSET_OF (EFI_VARIABLE_AUTHENTICATION, AuthInfo)) + \\r
	36	(OFFSET_OF (WIN_CERTIFICATE_UEFI_GUID, CertData)) + \\r
	37	sizeof (EFI_CERT_BLOCK_RSA_2048_SHA256))\r
	38	\r
	39	#define AUTHINFO2_SIZE(VarAuth2) ((OFFSET_OF (EFI_VARIABLE_AUTHENTICATION_2, AuthInfo)) + \\r
	40	(UINTN) ((EFI_VARIABLE_AUTHENTICATION_2 *) (VarAuth2))->AuthInfo.Hdr.dwLength)\r
	41	\r
	42	#define OFFSET_OF_AUTHINFO2_CERT_DATA ((OFFSET_OF (EFI_VARIABLE_AUTHENTICATION_2, AuthInfo)) + \\r
	43	(OFFSET_OF (WIN_CERTIFICATE_UEFI_GUID, CertData)))\r
	44	\r
	45	///\r
	46	/// "AuthVarKeyDatabase" variable for the Public Key store.\r
	47	///\r
	48	#define AUTHVAR_KEYDB_NAME L"AuthVarKeyDatabase"\r
	49	\r
	50	///\r
	51	/// "certdb" variable stores the signer's certificates for non PK/KEK/DB/DBX\r
	52	/// variables with EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS set.\r
	53	/// \r
	54	///\r
	55	#define EFI_CERT_DB_NAME L"certdb"\r
	56	\r
	57	///\r
	58	/// Struct to record signature requirement defined by UEFI spec.\r
	59	/// For SigHeaderSize and SigDataSize, ((UINT32) ~0) means NO exact length requirement for this field.\r
	60	///\r
	61	typedef struct {\r
	62	EFI_GUID SigType;\r
	63	// Expected SignatureHeader size in Bytes.\r
	64	UINT32 SigHeaderSize;\r
	65	// Expected SignatureData size in Bytes.\r
	66	UINT32 SigDataSize;\r
	67	} EFI_SIGNATURE_ITEM;\r
	68	\r
	69	typedef enum {\r
	70	AuthVarTypePk,\r
	71	AuthVarTypeKek,\r
	72	AuthVarTypePriv,\r
	73	AuthVarTypePayload\r
	74	} AUTHVAR_TYPE;\r
	75	\r
	76	#pragma pack(1)\r
	77	typedef struct {\r
	78	EFI_GUID VendorGuid;\r
	79	UINT32 CertNodeSize;\r
	80	UINT32 NameSize;\r
	81	UINT32 CertDataSize;\r
	82	/// CHAR16 VariableName[NameSize];\r
	83	/// UINT8 CertData[CertDataSize];\r
	84	} AUTH_CERT_DB_DATA;\r
	85	#pragma pack()\r
	86	\r
	87	/**\r
	88	Process variable with EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS/EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS set.\r
	89	\r
	90	Caution: This function may receive untrusted input.\r
	91	This function may be invoked in SMM mode, and datasize and data are external input.\r
	92	This function will do basic validation, before parse the data.\r
	93	This function will parse the authentication carefully to avoid security issues, like\r
	94	buffer overflow, integer overflow.\r
	95	This function will check attribute carefully to avoid authentication bypass.\r
	96	\r
	97	@param[in] VariableName Name of Variable to be found.\r
	98	@param[in] VendorGuid Variable vendor GUID.\r
	99	\r
	100	@param[in] Data Data pointer.\r
	101	@param[in] DataSize Size of Data found. If size is less than the\r
	102	data, this value contains the required size.\r
	103	@param[in] Variable The variable information which is used to keep track of variable usage.\r
	104	@param[in] Attributes Attribute value of the variable.\r
	105	\r
	106	@return EFI_INVALID_PARAMETER Invalid parameter\r
	107	@return EFI_WRITE_PROTECTED Variable is write-protected and needs authentication with\r
	108	EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS set.\r
	109	@return EFI_SECURITY_VIOLATION The variable is with EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS\r
	110	set, but the AuthInfo does NOT pass the validation\r
	111	check carried out by the firmware.\r
	112	@return EFI_SUCCESS Variable is not write-protected, or passed validation successfully.\r
	113	\r
	114	**/\r
	115	EFI_STATUS\r
	116	ProcessVariable (\r
	117	IN CHAR16 *VariableName,\r
	118	IN EFI_GUID *VendorGuid,\r
	119	IN VOID *Data,\r
	120	IN UINTN DataSize,\r
	121	IN VARIABLE_POINTER_TRACK *Variable,\r
	122	IN UINT32 Attributes\r
	123	);\r
	124	\r
	125	/**\r
	126	Update platform mode.\r
	127	\r
	128	@param[in] Mode SETUP_MODE or USER_MODE.\r
	129	\r
	130	@return EFI_INVALID_PARAMETER Invalid parameter.\r
	131	@return EFI_SUCCESS Update platform mode successfully.\r
	132	\r
	133	**/\r
	134	EFI_STATUS\r
	135	UpdatePlatformMode (\r
	136	IN UINT32 Mode\r
	137	);\r
	138	\r
	139	/**\r
	140	Initializes for authenticated varibale service.\r
	141	\r
	142	@retval EFI_SUCCESS Function successfully executed.\r
	143	@retval EFI_OUT_OF_RESOURCES Fail to allocate enough memory resource.\r
	144	\r
	145	**/\r
	146	EFI_STATUS\r
	147	AutenticatedVariableServiceInitialize (\r
	148	VOID\r
	149	);\r
	150	\r
	151	/**\r
	152	Initializes for cryptlib service before use, include register algrithm and allocate scratch.\r
	153	\r
	154	**/\r
	155	VOID\r
	156	CryptLibraryInitialize (\r
	157	VOID\r
	158	);\r
	159	\r
	160	/**\r
	161	Check input data form to make sure it is a valid EFI_SIGNATURE_LIST for PK/KEK variable.\r
	162	\r
	163	@param[in] VariableName Name of Variable to be check.\r
	164	@param[in] VendorGuid Variable vendor GUID.\r
	165	@param[in] Data Point to the variable data to be checked.\r
	166	@param[in] DataSize Size of Data.\r
	167	\r
	168	@return EFI_INVALID_PARAMETER Invalid signature list format.\r
	169	@return EFI_SUCCESS Passed signature list format check successfully.\r
	170	\r
	171	**/\r
	172	EFI_STATUS\r
	173	CheckSignatureListFormat(\r
	174	IN CHAR16 *VariableName,\r
	175	IN EFI_GUID *VendorGuid,\r
	176	IN VOID *Data,\r
	177	IN UINTN DataSize\r
	178	);\r
	179	\r
	180	/**\r
	181	Process variable with platform key for verification.\r
	182	\r
	183	Caution: This function may receive untrusted input.\r
	184	This function may be invoked in SMM mode, and datasize and data are external input.\r
	185	This function will do basic validation, before parse the data.\r
	186	This function will parse the authentication carefully to avoid security issues, like\r
	187	buffer overflow, integer overflow.\r
	188	This function will check attribute carefully to avoid authentication bypass.\r
	189	\r
	190	@param[in] VariableName Name of Variable to be found.\r
	191	@param[in] VendorGuid Variable vendor GUID.\r
	192	@param[in] Data Data pointer.\r
	193	@param[in] DataSize Size of Data found. If size is less than the\r
	194	data, this value contains the required size.\r
	195	@param[in] Variable The variable information which is used to keep track of variable usage.\r
	196	@param[in] Attributes Attribute value of the variable.\r
	197	@param[in] IsPk Indicate whether it is to process pk.\r
	198	\r
	199	@return EFI_INVALID_PARAMETER Invalid parameter\r
	200	@return EFI_SECURITY_VIOLATION The variable does NOT pass the validation\r
	201	check carried out by the firmware.\r
	202	@return EFI_SUCCESS Variable passed validation successfully.\r
	203	\r
	204	**/\r
	205	EFI_STATUS\r
	206	ProcessVarWithPk (\r
	207	IN CHAR16 *VariableName,\r
	208	IN EFI_GUID *VendorGuid,\r
	209	IN VOID *Data,\r
	210	IN UINTN DataSize,\r
	211	IN VARIABLE_POINTER_TRACK *Variable,\r
	212	IN UINT32 Attributes OPTIONAL,\r
	213	IN BOOLEAN IsPk\r
	214	);\r
	215	\r
	216	/**\r
	217	Process variable with key exchange key for verification.\r
	218	\r
	219	Caution: This function may receive untrusted input.\r
	220	This function may be invoked in SMM mode, and datasize and data are external input.\r
	221	This function will do basic validation, before parse the data.\r
	222	This function will parse the authentication carefully to avoid security issues, like\r
	223	buffer overflow, integer overflow.\r
	224	This function will check attribute carefully to avoid authentication bypass.\r
	225	\r
	226	@param[in] VariableName Name of Variable to be found.\r
	227	@param[in] VendorGuid Variable vendor GUID.\r
	228	@param[in] Data Data pointer.\r
	229	@param[in] DataSize Size of Data found. If size is less than the\r
	230	data, this value contains the required size.\r
	231	@param[in] Variable The variable information that is used to keep track of variable usage.\r
	232	@param[in] Attributes Attribute value of the variable.\r
	233	\r
	234	@return EFI_INVALID_PARAMETER Invalid parameter.\r
	235	@return EFI_SECURITY_VIOLATION The variable does NOT pass the validation\r
	236	check carried out by the firmware.\r
	237	@return EFI_SUCCESS Variable passed validation successfully.\r
	238	\r
	239	**/\r
	240	EFI_STATUS\r
	241	ProcessVarWithKek (\r
	242	IN CHAR16 *VariableName,\r
	243	IN EFI_GUID *VendorGuid,\r
	244	IN VOID *Data,\r
	245	IN UINTN DataSize,\r
	246	IN VARIABLE_POINTER_TRACK *Variable,\r
	247	IN UINT32 Attributes OPTIONAL\r
	248	);\r
	249	\r
	250	/**\r
	251	Merge two buffers which formatted as EFI_SIGNATURE_LIST. Only the new EFI_SIGNATURE_DATA\r
	252	will be appended to the original EFI_SIGNATURE_LIST, duplicate EFI_SIGNATURE_DATA\r
	253	will be ignored.\r
	254	\r
	255	@param[in, out] Data Pointer to original EFI_SIGNATURE_LIST.\r
	256	@param[in] DataSize Size of Data buffer.\r
	257	@param[in] FreeBufSize Size of free data buffer \r
	258	@param[in] NewData Pointer to new EFI_SIGNATURE_LIST to be appended.\r
	259	@param[in] NewDataSize Size of NewData buffer.\r
	260	@param[out] MergedBufSize Size of the merged buffer\r
	261	\r
	262	@return EFI_BUFFER_TOO_SMALL if input Data buffer overflowed\r
	263	\r
	264	**/\r
	265	EFI_STATUS\r
	266	AppendSignatureList (\r
	267	IN OUT VOID *Data,\r
	268	IN UINTN DataSize,\r
	269	IN UINTN FreeBufSize,\r
	270	IN VOID *NewData,\r
	271	IN UINTN NewDataSize,\r
	272	OUT UINTN *MergedBufSize\r
	273	);\r
	274	\r
	275	/**\r
	276	Compare two EFI_TIME data.\r
	277	\r
	278	\r
	279	@param FirstTime A pointer to the first EFI_TIME data.\r
	280	@param SecondTime A pointer to the second EFI_TIME data.\r
	281	\r
	282	@retval TRUE The FirstTime is not later than the SecondTime.\r
	283	@retval FALSE The FirstTime is later than the SecondTime.\r
	284	\r
	285	**/\r
	286	BOOLEAN\r
	287	CompareTimeStamp (\r
	288	IN EFI_TIME *FirstTime,\r
	289	IN EFI_TIME *SecondTime\r
	290	);\r
	291	\r
	292	/**\r
	293	Delete matching signer's certificates when deleting common authenticated\r
	294	variable by corresponding VariableName and VendorGuid from "certdb".\r
	295	\r
	296	@param[in] VariableName Name of authenticated Variable.\r
	297	@param[in] VendorGuid Vendor GUID of authenticated Variable.\r
	298	\r
	299	@retval EFI_INVALID_PARAMETER Any input parameter is invalid.\r
	300	@retval EFI_NOT_FOUND Fail to find "certdb" or matching certs.\r
	301	@retval EFI_OUT_OF_RESOURCES The operation is failed due to lack of resources.\r
	302	@retval EFI_SUCCESS The operation is completed successfully.\r
	303	\r
	304	**/\r
	305	EFI_STATUS\r
	306	DeleteCertsFromDb (\r
	307	IN CHAR16 *VariableName,\r
	308	IN EFI_GUID *VendorGuid\r
	309	);\r
	310	\r
	311	/**\r
	312	Process variable with EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS set\r
	313	\r
	314	Caution: This function may receive untrusted input.\r
	315	This function may be invoked in SMM mode, and datasize and data are external input.\r
	316	This function will do basic validation, before parse the data.\r
	317	This function will parse the authentication carefully to avoid security issues, like\r
	318	buffer overflow, integer overflow.\r
	319	\r
	320	@param[in] VariableName Name of Variable to be found.\r
	321	@param[in] VendorGuid Variable vendor GUID.\r
	322	@param[in] Data Data pointer.\r
	323	@param[in] DataSize Size of Data found. If size is less than the\r
	324	data, this value contains the required size.\r
	325	@param[in] Variable The variable information which is used to keep track of variable usage.\r
	326	@param[in] Attributes Attribute value of the variable.\r
	327	@param[in] AuthVarType Verify against PK or KEK database or private database.\r
	328	@param[out] VarDel Delete the variable or not.\r
	329	\r
	330	@retval EFI_INVALID_PARAMETER Invalid parameter.\r
	331	@retval EFI_SECURITY_VIOLATION The variable does NOT pass the validation\r
	332	check carried out by the firmware.\r
	333	@retval EFI_OUT_OF_RESOURCES Failed to process variable due to lack\r
	334	of resources.\r
	335	@retval EFI_SUCCESS Variable pass validation successfully.\r
	336	\r
	337	**/\r
	338	EFI_STATUS\r
	339	VerifyTimeBasedPayload (\r
	340	IN CHAR16 *VariableName,\r
	341	IN EFI_GUID *VendorGuid,\r
	342	IN VOID *Data,\r
	343	IN UINTN DataSize,\r
	344	IN VARIABLE_POINTER_TRACK *Variable,\r
	345	IN UINT32 Attributes,\r
	346	IN AUTHVAR_TYPE AuthVarType,\r
	347	OUT BOOLEAN *VarDel\r
	348	);\r
	349	\r
	350	extern UINT8 *mPubKeyStore;\r
	351	extern UINT8 *mCertDbStore;\r
	352	extern UINT32 mPubKeyNumber;\r
	353	extern VOID *mHashCtx;\r
	354	\r
	355	#endif\r