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1 | /** @file\r | |
2 | Implement TPM2 Session related command.\r | |
3 | \r | |
4 | Copyright (c) 2014 - 2018, Intel Corporation. All rights reserved. <BR>\r | |
5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
6 | \r | |
7 | **/\r | |
8 | \r | |
9 | #include <IndustryStandard/UefiTcgPlatform.h>\r | |
10 | #include <Library/Tpm2CommandLib.h>\r | |
11 | #include <Library/Tpm2DeviceLib.h>\r | |
12 | #include <Library/BaseMemoryLib.h>\r | |
13 | #include <Library/BaseLib.h>\r | |
14 | #include <Library/DebugLib.h>\r | |
15 | \r | |
16 | #pragma pack(1)\r | |
17 | \r | |
18 | typedef struct {\r | |
19 | TPM2_COMMAND_HEADER Header;\r | |
20 | TPMI_DH_OBJECT TpmKey;\r | |
21 | TPMI_DH_ENTITY Bind;\r | |
22 | TPM2B_NONCE NonceCaller;\r | |
23 | TPM2B_ENCRYPTED_SECRET Salt;\r | |
24 | TPM_SE SessionType;\r | |
25 | TPMT_SYM_DEF Symmetric;\r | |
26 | TPMI_ALG_HASH AuthHash;\r | |
27 | } TPM2_START_AUTH_SESSION_COMMAND;\r | |
28 | \r | |
29 | typedef struct {\r | |
30 | TPM2_RESPONSE_HEADER Header;\r | |
31 | TPMI_SH_AUTH_SESSION SessionHandle;\r | |
32 | TPM2B_NONCE NonceTPM;\r | |
33 | } TPM2_START_AUTH_SESSION_RESPONSE;\r | |
34 | \r | |
35 | #pragma pack()\r | |
36 | \r | |
37 | /**\r | |
38 | This command is used to start an authorization session using alternative methods of\r | |
39 | establishing the session key (sessionKey) that is used for authorization and encrypting value.\r | |
40 | \r | |
41 | @param[in] TpmKey Handle of a loaded decrypt key used to encrypt salt.\r | |
42 | @param[in] Bind Entity providing the authValue.\r | |
43 | @param[in] NonceCaller Initial nonceCaller, sets nonce size for the session.\r | |
44 | @param[in] Salt Value encrypted according to the type of tpmKey.\r | |
45 | @param[in] SessionType Indicates the type of the session.\r | |
46 | @param[in] Symmetric The algorithm and key size for parameter encryption.\r | |
47 | @param[in] AuthHash Hash algorithm to use for the session.\r | |
48 | @param[out] SessionHandle Handle for the newly created session.\r | |
49 | @param[out] NonceTPM The initial nonce from the TPM, used in the computation of the sessionKey.\r | |
50 | \r | |
51 | @retval EFI_SUCCESS Operation completed successfully.\r | |
52 | @retval EFI_DEVICE_ERROR The command was unsuccessful.\r | |
53 | **/\r | |
54 | EFI_STATUS\r | |
55 | EFIAPI\r | |
56 | Tpm2StartAuthSession (\r | |
57 | IN TPMI_DH_OBJECT TpmKey,\r | |
58 | IN TPMI_DH_ENTITY Bind,\r | |
59 | IN TPM2B_NONCE *NonceCaller,\r | |
60 | IN TPM2B_ENCRYPTED_SECRET *Salt,\r | |
61 | IN TPM_SE SessionType,\r | |
62 | IN TPMT_SYM_DEF *Symmetric,\r | |
63 | IN TPMI_ALG_HASH AuthHash,\r | |
64 | OUT TPMI_SH_AUTH_SESSION *SessionHandle,\r | |
65 | OUT TPM2B_NONCE *NonceTPM\r | |
66 | )\r | |
67 | {\r | |
68 | EFI_STATUS Status;\r | |
69 | TPM2_START_AUTH_SESSION_COMMAND SendBuffer;\r | |
70 | TPM2_START_AUTH_SESSION_RESPONSE RecvBuffer;\r | |
71 | UINT32 SendBufferSize;\r | |
72 | UINT32 RecvBufferSize;\r | |
73 | UINT8 *Buffer;\r | |
74 | \r | |
75 | //\r | |
76 | // Construct command\r | |
77 | //\r | |
78 | SendBuffer.Header.tag = SwapBytes16(TPM_ST_NO_SESSIONS);\r | |
79 | SendBuffer.Header.commandCode = SwapBytes32(TPM_CC_StartAuthSession);\r | |
80 | \r | |
81 | SendBuffer.TpmKey = SwapBytes32 (TpmKey);\r | |
82 | SendBuffer.Bind = SwapBytes32 (Bind);\r | |
83 | Buffer = (UINT8 *)&SendBuffer.NonceCaller;\r | |
84 | \r | |
85 | WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (NonceCaller->size));\r | |
86 | Buffer += sizeof(UINT16);\r | |
87 | CopyMem (Buffer, NonceCaller->buffer, NonceCaller->size);\r | |
88 | Buffer += NonceCaller->size;\r | |
89 | \r | |
90 | WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Salt->size));\r | |
91 | Buffer += sizeof(UINT16);\r | |
92 | CopyMem (Buffer, Salt->secret, Salt->size);\r | |
93 | Buffer += Salt->size;\r | |
94 | \r | |
95 | *(TPM_SE *)Buffer = SessionType;\r | |
96 | Buffer++;\r | |
97 | \r | |
98 | WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Symmetric->algorithm));\r | |
99 | Buffer += sizeof(UINT16);\r | |
100 | switch (Symmetric->algorithm) {\r | |
101 | case TPM_ALG_NULL:\r | |
102 | break;\r | |
103 | case TPM_ALG_AES:\r | |
104 | WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Symmetric->keyBits.aes));\r | |
105 | Buffer += sizeof(UINT16);\r | |
106 | WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Symmetric->mode.aes));\r | |
107 | Buffer += sizeof(UINT16);\r | |
108 | break;\r | |
109 | case TPM_ALG_SM4:\r | |
110 | WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Symmetric->keyBits.SM4));\r | |
111 | Buffer += sizeof(UINT16);\r | |
112 | WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Symmetric->mode.SM4));\r | |
113 | Buffer += sizeof(UINT16);\r | |
114 | break;\r | |
115 | case TPM_ALG_SYMCIPHER:\r | |
116 | WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Symmetric->keyBits.sym));\r | |
117 | Buffer += sizeof(UINT16);\r | |
118 | WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Symmetric->mode.sym));\r | |
119 | Buffer += sizeof(UINT16);\r | |
120 | break;\r | |
121 | case TPM_ALG_XOR:\r | |
122 | WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Symmetric->keyBits.xor));\r | |
123 | Buffer += sizeof(UINT16);\r | |
124 | break;\r | |
125 | default:\r | |
126 | ASSERT (FALSE);\r | |
127 | DEBUG ((DEBUG_ERROR, "Tpm2StartAuthSession - Symmetric->algorithm - %x\n", Symmetric->algorithm));\r | |
128 | return EFI_UNSUPPORTED;\r | |
129 | }\r | |
130 | \r | |
131 | WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (AuthHash));\r | |
132 | Buffer += sizeof(UINT16);\r | |
133 | \r | |
134 | SendBufferSize = (UINT32) ((UINTN)Buffer - (UINTN)&SendBuffer);\r | |
135 | SendBuffer.Header.paramSize = SwapBytes32 (SendBufferSize);\r | |
136 | \r | |
137 | //\r | |
138 | // send Tpm command\r | |
139 | //\r | |
140 | RecvBufferSize = sizeof (RecvBuffer);\r | |
141 | Status = Tpm2SubmitCommand (SendBufferSize, (UINT8 *)&SendBuffer, &RecvBufferSize, (UINT8 *)&RecvBuffer);\r | |
142 | if (EFI_ERROR (Status)) {\r | |
143 | return Status;\r | |
144 | }\r | |
145 | \r | |
146 | if (RecvBufferSize < sizeof (TPM2_RESPONSE_HEADER)) {\r | |
147 | DEBUG ((DEBUG_ERROR, "Tpm2StartAuthSession - RecvBufferSize Error - %x\n", RecvBufferSize));\r | |
148 | return EFI_DEVICE_ERROR;\r | |
149 | }\r | |
150 | if (SwapBytes32(RecvBuffer.Header.responseCode) != TPM_RC_SUCCESS) {\r | |
151 | DEBUG ((DEBUG_ERROR, "Tpm2StartAuthSession - responseCode - %x\n", SwapBytes32(RecvBuffer.Header.responseCode)));\r | |
152 | return EFI_DEVICE_ERROR;\r | |
153 | }\r | |
154 | \r | |
155 | //\r | |
156 | // Return the response\r | |
157 | //\r | |
158 | *SessionHandle = SwapBytes32 (RecvBuffer.SessionHandle);\r | |
159 | NonceTPM->size = SwapBytes16 (RecvBuffer.NonceTPM.size);\r | |
160 | if (NonceTPM->size > sizeof(TPMU_HA)) {\r | |
161 | DEBUG ((DEBUG_ERROR, "Tpm2StartAuthSession - NonceTPM->size error %x\n", NonceTPM->size));\r | |
162 | return EFI_DEVICE_ERROR;\r | |
163 | }\r | |
164 | \r | |
165 | CopyMem (NonceTPM->buffer, &RecvBuffer.NonceTPM.buffer, NonceTPM->size);\r | |
166 | \r | |
167 | return EFI_SUCCESS;\r | |
168 | }\r |