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1 | /** @file\r | |
2 | This file is for Challenge-Handshake Authentication Protocol (CHAP) Configuration.\r | |
3 | \r | |
4 | Copyright (c) 2004 - 2008, Intel Corporation.<BR>\r | |
5 | All rights reserved. This program and the accompanying materials\r | |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | **/\r | |
14 | \r | |
15 | #include "IScsiImpl.h"\r | |
16 | #include "Md5.h"\r | |
17 | \r | |
18 | EFI_GUID mIScsiCHAPAuthInfoGuid = ISCSI_CHAP_AUTH_INFO_GUID;\r | |
19 | \r | |
20 | /**\r | |
21 | Initator caculates its own expected hash value. \r | |
22 | \r | |
23 | @param[in] ChapIdentifier ISCSI CHAP identifier sent by authenticator. \r | |
24 | @param[in] ChapSecret ISCSI CHAP secret of the authenticator. \r | |
25 | @param[in] SecretLength The length of ISCSI CHAP secret.\r | |
26 | @param[in] ChapChallenge The challenge message sent by authenticator. \r | |
27 | @param[in] ChallengeLength The length of ISCSI CHAP challenge message.\r | |
28 | @param[out] ChapResponse The calculation of the expected hash value.\r | |
29 | \r | |
30 | @retval EFI_SUCCESS The expected hash value was caculatedly successfully.\r | |
31 | @retval EFI_PROTOCOL_ERROR The length of the secret should be at least the \r | |
32 | length of the hash value for the hashing algorithm chosen.\r | |
33 | @retval Others Some unexpected error happened. \r | |
34 | **/\r | |
35 | EFI_STATUS\r | |
36 | IScsiCHAPCalculateResponse (\r | |
37 | IN UINT32 ChapIdentifier,\r | |
38 | IN CHAR8 *ChapSecret,\r | |
39 | IN UINT32 SecretLength,\r | |
40 | IN UINT8 *ChapChallenge,\r | |
41 | IN UINT32 ChallengeLength,\r | |
42 | OUT UINT8 *ChapResponse\r | |
43 | )\r | |
44 | {\r | |
45 | MD5_CTX Md5Ctx;\r | |
46 | CHAR8 IdByte[1];\r | |
47 | EFI_STATUS Status;\r | |
48 | \r | |
49 | Status = MD5Init (&Md5Ctx);\r | |
50 | \r | |
51 | //\r | |
52 | // Hash Identifier - Only calculate 1 byte data (RFC1994)\r | |
53 | //\r | |
54 | IdByte[0] = (CHAR8) ChapIdentifier;\r | |
55 | MD5Update (&Md5Ctx, IdByte, 1);\r | |
56 | \r | |
57 | //\r | |
58 | // Hash Secret\r | |
59 | //\r | |
60 | if (SecretLength < ISCSI_CHAP_SECRET_MIN_LEN - 1) {\r | |
61 | return EFI_PROTOCOL_ERROR;\r | |
62 | }\r | |
63 | \r | |
64 | MD5Update (&Md5Ctx, ChapSecret, SecretLength);\r | |
65 | \r | |
66 | //\r | |
67 | // Hash Challenge received from Target\r | |
68 | //\r | |
69 | MD5Update (&Md5Ctx, ChapChallenge, ChallengeLength);\r | |
70 | \r | |
71 | Status = MD5Final (&Md5Ctx, ChapResponse);\r | |
72 | \r | |
73 | return Status;\r | |
74 | }\r | |
75 | \r | |
76 | /**\r | |
77 | The initator checks the CHAP response replied by target against its own\r | |
78 | calculation of the expected hash value. \r | |
79 | \r | |
80 | @param[in] AuthData ISCSI CHAP authentication data. \r | |
81 | @param[in] TargetResponse The response from target. \r | |
82 | \r | |
83 | @retval EFI_SUCCESS The response from target passed authentication.\r | |
84 | @retval EFI_SECURITY_VIOLATION The response from target was not expected value.\r | |
85 | @retval Others Some unexpected error happened.\r | |
86 | **/\r | |
87 | EFI_STATUS\r | |
88 | IScsiCHAPAuthTarget (\r | |
89 | IN ISCSI_CHAP_AUTH_DATA *AuthData,\r | |
90 | IN UINT8 *TargetResponse\r | |
91 | )\r | |
92 | {\r | |
93 | EFI_STATUS Status;\r | |
94 | UINT32 SecretSize;\r | |
95 | UINT8 VerifyRsp[ISCSI_CHAP_RSP_LEN];\r | |
96 | \r | |
97 | Status = EFI_SUCCESS;\r | |
98 | \r | |
99 | SecretSize = (UINT32) AsciiStrLen (AuthData->AuthConfig.ReverseCHAPSecret);\r | |
100 | Status = IScsiCHAPCalculateResponse (\r | |
101 | AuthData->OutIdentifier,\r | |
102 | AuthData->AuthConfig.ReverseCHAPSecret,\r | |
103 | SecretSize,\r | |
104 | AuthData->OutChallenge,\r | |
105 | AuthData->OutChallengeLength,\r | |
106 | VerifyRsp\r | |
107 | );\r | |
108 | \r | |
109 | if (CompareMem (VerifyRsp, TargetResponse, ISCSI_CHAP_RSP_LEN)) {\r | |
110 | Status = EFI_SECURITY_VIOLATION;\r | |
111 | }\r | |
112 | \r | |
113 | return Status;\r | |
114 | }\r | |
115 | \r | |
116 | /**\r | |
117 | This function checks the received iSCSI Login Response during the security\r | |
118 | negotiation stage.\r | |
119 | \r | |
120 | @param[in] Conn The iSCSI connection.\r | |
121 | @param[in] Transit The transit flag of the latest iSCSI Login Response.\r | |
122 | \r | |
123 | @retval EFI_SUCCESS The Login Response passed the CHAP validation.\r | |
124 | @retval EFI_OUT_OF_RESOURCES Failed to allocate memory.\r | |
125 | @retval EFI_PROTOCOL_ERROR Some kind of protocol error happend.\r | |
126 | @retval Others Some unexpected error happend.\r | |
127 | **/\r | |
128 | EFI_STATUS\r | |
129 | IScsiCHAPOnRspReceived (\r | |
130 | IN ISCSI_CONNECTION *Conn,\r | |
131 | IN BOOLEAN Transit\r | |
132 | )\r | |
133 | {\r | |
134 | EFI_STATUS Status;\r | |
135 | ISCSI_SESSION *Session;\r | |
136 | ISCSI_CHAP_AUTH_DATA *AuthData;\r | |
137 | CHAR8 *Value;\r | |
138 | UINT8 *Data;\r | |
139 | UINT32 Len;\r | |
140 | LIST_ENTRY *KeyValueList;\r | |
141 | UINTN Algorithm;\r | |
142 | CHAR8 *Identifier;\r | |
143 | CHAR8 *Challenge;\r | |
144 | CHAR8 *Name;\r | |
145 | CHAR8 *Response;\r | |
146 | UINT8 TargetRsp[ISCSI_CHAP_RSP_LEN];\r | |
147 | UINT32 RspLen;\r | |
148 | \r | |
149 | ASSERT (Conn->CurrentStage == ISCSI_SECURITY_NEGOTIATION);\r | |
150 | ASSERT (Conn->RspQue.BufNum != 0);\r | |
151 | \r | |
152 | Session = Conn->Session;\r | |
153 | AuthData = &Session->AuthData;\r | |
154 | \r | |
155 | Len = Conn->RspQue.BufSize;\r | |
156 | Data = AllocatePool (Len);\r | |
157 | if (Data == NULL) {\r | |
158 | return EFI_OUT_OF_RESOURCES;\r | |
159 | }\r | |
160 | //\r | |
161 | // Copy the data in case the data spans over multiple PDUs.\r | |
162 | //\r | |
163 | NetbufQueCopy (&Conn->RspQue, 0, Len, Data);\r | |
164 | \r | |
165 | //\r | |
166 | // Build the key-value list from the data segment of the Login Response.\r | |
167 | //\r | |
168 | KeyValueList = IScsiBuildKeyValueList ((CHAR8 *) Data, Len);\r | |
169 | if (KeyValueList == NULL) {\r | |
170 | Status = EFI_OUT_OF_RESOURCES;\r | |
171 | goto ON_EXIT;\r | |
172 | }\r | |
173 | \r | |
174 | Status = EFI_PROTOCOL_ERROR;\r | |
175 | \r | |
176 | switch (Conn->CHAPStep) {\r | |
177 | case ISCSI_CHAP_INITIAL:\r | |
178 | //\r | |
179 | // The first Login Response.\r | |
180 | //\r | |
181 | Value = IScsiGetValueByKeyFromList (KeyValueList, ISCSI_KEY_TARGET_PORTAL_GROUP_TAG);\r | |
182 | if (Value == NULL) {\r | |
183 | goto ON_EXIT;\r | |
184 | }\r | |
185 | \r | |
186 | Session->TargetPortalGroupTag = (UINT16) AsciiStrDecimalToUintn (Value);\r | |
187 | \r | |
188 | Value = IScsiGetValueByKeyFromList (KeyValueList, ISCSI_KEY_AUTH_METHOD);\r | |
189 | if (Value == NULL) {\r | |
190 | goto ON_EXIT;\r | |
191 | }\r | |
192 | //\r | |
193 | // Initiator mandates CHAP authentication but target replies without "CHAP" or\r | |
194 | // initiator suggets "None" but target replies with some kind of auth method.\r | |
195 | //\r | |
196 | if (AsciiStrCmp (Value, ISCSI_AUTH_METHOD_CHAP) == 0) {\r | |
197 | if (AuthData->AuthConfig.CHAPType == ISCSI_CHAP_NONE) {\r | |
198 | goto ON_EXIT;\r | |
199 | }\r | |
200 | } else {\r | |
201 | if (AuthData->AuthConfig.CHAPType != ISCSI_CHAP_NONE) {\r | |
202 | goto ON_EXIT;\r | |
203 | }\r | |
204 | }\r | |
205 | //\r | |
206 | // Transit to CHAP step one.\r | |
207 | //\r | |
208 | Conn->CHAPStep = ISCSI_CHAP_STEP_ONE;\r | |
209 | Status = EFI_SUCCESS;\r | |
210 | break;\r | |
211 | \r | |
212 | case ISCSI_CHAP_STEP_TWO:\r | |
213 | //\r | |
214 | // The Target replies with CHAP_A=<A> CHAP_I=<I> CHAP_C=<C>\r | |
215 | //\r | |
216 | Value = IScsiGetValueByKeyFromList (KeyValueList, ISCSI_KEY_CHAP_ALGORITHM);\r | |
217 | if (Value == NULL) {\r | |
218 | goto ON_EXIT;\r | |
219 | }\r | |
220 | \r | |
221 | Algorithm = AsciiStrDecimalToUintn (Value);\r | |
222 | if (Algorithm != ISCSI_CHAP_ALGORITHM_MD5) {\r | |
223 | //\r | |
224 | // Unsupported algorithm is chosen by target.\r | |
225 | //\r | |
226 | goto ON_EXIT;\r | |
227 | }\r | |
228 | \r | |
229 | Identifier = IScsiGetValueByKeyFromList (KeyValueList, ISCSI_KEY_CHAP_IDENTIFIER);\r | |
230 | if (Identifier == NULL) {\r | |
231 | goto ON_EXIT;\r | |
232 | }\r | |
233 | \r | |
234 | Challenge = IScsiGetValueByKeyFromList (KeyValueList, ISCSI_KEY_CHAP_CHALLENGE);\r | |
235 | if (Challenge == NULL) {\r | |
236 | goto ON_EXIT;\r | |
237 | }\r | |
238 | //\r | |
239 | // Process the CHAP identifier and CHAP Challenge from Target\r | |
240 | // Calculate Response value\r | |
241 | //\r | |
242 | AuthData->InIdentifier = (UINT32) AsciiStrDecimalToUintn (Identifier);\r | |
243 | AuthData->InChallengeLength = ISCSI_CHAP_AUTH_MAX_LEN;\r | |
244 | IScsiHexToBin ((UINT8 *) AuthData->InChallenge, &AuthData->InChallengeLength, Challenge);\r | |
245 | Status = IScsiCHAPCalculateResponse (\r | |
246 | AuthData->InIdentifier,\r | |
247 | AuthData->AuthConfig.CHAPSecret,\r | |
248 | (UINT32) AsciiStrLen (AuthData->AuthConfig.CHAPSecret),\r | |
249 | AuthData->InChallenge,\r | |
250 | AuthData->InChallengeLength,\r | |
251 | AuthData->CHAPResponse\r | |
252 | );\r | |
253 | \r | |
254 | //\r | |
255 | // Transit to next step.\r | |
256 | //\r | |
257 | Conn->CHAPStep = ISCSI_CHAP_STEP_THREE;\r | |
258 | break;\r | |
259 | \r | |
260 | case ISCSI_CHAP_STEP_THREE:\r | |
261 | //\r | |
262 | // one way CHAP authentication and the target would like to\r | |
263 | // authenticate us.\r | |
264 | //\r | |
265 | Status = EFI_SUCCESS;\r | |
266 | break;\r | |
267 | \r | |
268 | case ISCSI_CHAP_STEP_FOUR:\r | |
269 | ASSERT (AuthData->AuthConfig.CHAPType == ISCSI_CHAP_MUTUAL);\r | |
270 | //\r | |
271 | // The forth step, CHAP_N=<N> CHAP_R=<R> is received from Target.\r | |
272 | //\r | |
273 | Name = IScsiGetValueByKeyFromList (KeyValueList, ISCSI_KEY_CHAP_NAME);\r | |
274 | if (Name == NULL) {\r | |
275 | goto ON_EXIT;\r | |
276 | }\r | |
277 | \r | |
278 | Response = IScsiGetValueByKeyFromList (KeyValueList, ISCSI_KEY_CHAP_RESPONSE);\r | |
279 | if (Response == NULL) {\r | |
280 | goto ON_EXIT;\r | |
281 | }\r | |
282 | \r | |
283 | RspLen = ISCSI_CHAP_RSP_LEN;\r | |
284 | IScsiHexToBin (TargetRsp, &RspLen, Response);\r | |
285 | \r | |
286 | //\r | |
287 | // Check the CHAP Response replied by Target.\r | |
288 | //\r | |
289 | Status = IScsiCHAPAuthTarget (AuthData, TargetRsp);\r | |
290 | break;\r | |
291 | \r | |
292 | default:\r | |
293 | break;\r | |
294 | }\r | |
295 | \r | |
296 | ON_EXIT:\r | |
297 | \r | |
298 | IScsiFreeKeyValueList (KeyValueList);\r | |
299 | \r | |
300 | gBS->FreePool (Data);\r | |
301 | \r | |
302 | return Status;\r | |
303 | }\r | |
304 | \r | |
305 | /**\r | |
306 | This function fills the CHAP authentication information into the login PDU\r | |
307 | during the security negotiation stage in the iSCSI connection login.\r | |
308 | \r | |
309 | @param[in] Conn The iSCSI connection.\r | |
310 | @param[in] Pdu The PDU to send out.\r | |
311 | \r | |
312 | @retval EFI_SUCCESS All check passed and the phase-related CHAP\r | |
313 | authentication info is filled into the iSCSI PDU.\r | |
314 | @retval EFI_OUT_OF_RESOURCES Failed to allocate memory.\r | |
315 | @retval EFI_PROTOCOL_ERROR Some kind of protocol error happend.\r | |
316 | **/\r | |
317 | EFI_STATUS\r | |
318 | IScsiCHAPToSendReq (\r | |
319 | IN ISCSI_CONNECTION *Conn,\r | |
320 | IN NET_BUF *Pdu\r | |
321 | )\r | |
322 | {\r | |
323 | EFI_STATUS Status;\r | |
324 | ISCSI_SESSION *Session;\r | |
325 | ISCSI_LOGIN_REQUEST *LoginReq;\r | |
326 | ISCSI_CHAP_AUTH_DATA *AuthData;\r | |
327 | CHAR8 *Value;\r | |
328 | CHAR8 ValueStr[256];\r | |
329 | CHAR8 *Response;\r | |
330 | UINT32 RspLen;\r | |
331 | CHAR8 *Challenge;\r | |
332 | UINT32 ChallengeLen;\r | |
333 | \r | |
334 | ASSERT (Conn->CurrentStage == ISCSI_SECURITY_NEGOTIATION);\r | |
335 | \r | |
336 | Session = Conn->Session;\r | |
337 | AuthData = &Session->AuthData;\r | |
338 | LoginReq = (ISCSI_LOGIN_REQUEST *) NetbufGetByte (Pdu, 0, 0);\r | |
339 | Status = EFI_SUCCESS;\r | |
340 | \r | |
341 | RspLen = 2 * ISCSI_CHAP_RSP_LEN + 3;\r | |
342 | Response = AllocatePool (RspLen);\r | |
343 | if (Response == NULL) {\r | |
344 | return EFI_OUT_OF_RESOURCES;\r | |
345 | }\r | |
346 | \r | |
347 | ChallengeLen = 2 * ISCSI_CHAP_RSP_LEN + 3;\r | |
348 | Challenge = AllocatePool (ChallengeLen);\r | |
349 | if (Challenge == NULL) {\r | |
350 | return EFI_OUT_OF_RESOURCES;\r | |
351 | }\r | |
352 | \r | |
353 | switch (Conn->CHAPStep) {\r | |
354 | case ISCSI_CHAP_INITIAL:\r | |
355 | //\r | |
356 | // It's the initial Login Request. Fill in the key=value pairs mandatory\r | |
357 | // for the initial Login Request.\r | |
358 | //\r | |
359 | IScsiAddKeyValuePair (Pdu, ISCSI_KEY_INITIATOR_NAME, Session->InitiatorName);\r | |
360 | IScsiAddKeyValuePair (Pdu, ISCSI_KEY_SESSION_TYPE, "Normal");\r | |
361 | IScsiAddKeyValuePair (Pdu, ISCSI_KEY_TARGET_NAME, Session->ConfigData.NvData.TargetName);\r | |
362 | \r | |
363 | if (AuthData->AuthConfig.CHAPType == ISCSI_CHAP_NONE) {\r | |
364 | Value = ISCSI_KEY_VALUE_NONE;\r | |
365 | ISCSI_SET_FLAG (LoginReq, ISCSI_LOGIN_REQ_PDU_FLAG_TRANSIT);\r | |
366 | } else {\r | |
367 | Value = ISCSI_AUTH_METHOD_CHAP;\r | |
368 | }\r | |
369 | \r | |
370 | IScsiAddKeyValuePair (Pdu, ISCSI_KEY_AUTH_METHOD, Value);\r | |
371 | \r | |
372 | break;\r | |
373 | \r | |
374 | case ISCSI_CHAP_STEP_ONE:\r | |
375 | //\r | |
376 | // First step, send the Login Request with CHAP_A=<A1,A2...> key-value pair.\r | |
377 | //\r | |
378 | AsciiSPrint (ValueStr, sizeof (ValueStr), "%d", ISCSI_CHAP_ALGORITHM_MD5);\r | |
379 | IScsiAddKeyValuePair (Pdu, ISCSI_KEY_CHAP_ALGORITHM, ValueStr);\r | |
380 | \r | |
381 | Conn->CHAPStep = ISCSI_CHAP_STEP_TWO;\r | |
382 | break;\r | |
383 | \r | |
384 | case ISCSI_CHAP_STEP_THREE:\r | |
385 | //\r | |
386 | // Third step, send the Login Request with CHAP_N=<N> CHAP_R=<R> or\r | |
387 | // CHAP_N=<N> CHAP_R=<R> CHAP_I=<I> CHAP_C=<C> if target ahtentication is\r | |
388 | // required too.\r | |
389 | //\r | |
390 | // CHAP_N=<N>\r | |
391 | //\r | |
392 | IScsiAddKeyValuePair (Pdu, ISCSI_KEY_CHAP_NAME, (CHAR8 *) &AuthData->AuthConfig.CHAPName);\r | |
393 | //\r | |
394 | // CHAP_R=<R>\r | |
395 | //\r | |
396 | IScsiBinToHex ((UINT8 *) AuthData->CHAPResponse, ISCSI_CHAP_RSP_LEN, Response, &RspLen);\r | |
397 | IScsiAddKeyValuePair (Pdu, ISCSI_KEY_CHAP_RESPONSE, Response);\r | |
398 | \r | |
399 | if (AuthData->AuthConfig.CHAPType == ISCSI_CHAP_MUTUAL) {\r | |
400 | //\r | |
401 | // CHAP_I=<I>\r | |
402 | //\r | |
403 | IScsiGenRandom ((UINT8 *) &AuthData->OutIdentifier, 1);\r | |
404 | AsciiSPrint (ValueStr, sizeof (ValueStr), "%d", AuthData->OutIdentifier);\r | |
405 | IScsiAddKeyValuePair (Pdu, ISCSI_KEY_CHAP_IDENTIFIER, ValueStr);\r | |
406 | //\r | |
407 | // CHAP_C=<C>\r | |
408 | //\r | |
409 | IScsiGenRandom ((UINT8 *) AuthData->OutChallenge, ISCSI_CHAP_RSP_LEN);\r | |
410 | AuthData->OutChallengeLength = ISCSI_CHAP_RSP_LEN;\r | |
411 | IScsiBinToHex ((UINT8 *) AuthData->OutChallenge, ISCSI_CHAP_RSP_LEN, Challenge, &ChallengeLen);\r | |
412 | IScsiAddKeyValuePair (Pdu, ISCSI_KEY_CHAP_CHALLENGE, Challenge);\r | |
413 | \r | |
414 | Conn->CHAPStep = ISCSI_CHAP_STEP_FOUR;\r | |
415 | }\r | |
416 | //\r | |
417 | // set the stage transition flag.\r | |
418 | //\r | |
419 | ISCSI_SET_FLAG (LoginReq, ISCSI_LOGIN_REQ_PDU_FLAG_TRANSIT);\r | |
420 | break;\r | |
421 | \r | |
422 | default:\r | |
423 | Status = EFI_PROTOCOL_ERROR;\r | |
424 | break;\r | |
425 | }\r | |
426 | \r | |
427 | gBS->FreePool (Response);\r | |
428 | gBS->FreePool (Challenge);\r | |
429 | \r | |
430 | return Status;\r | |
431 | }\r |