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[thirdparty/hostap.git] / src / eap_peer / eap_peap.c
1 /*
2 * EAP peer method: EAP-PEAP (draft-josefsson-pppext-eap-tls-eap-10.txt)
3 * Copyright (c) 2004-2015, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10
11 #include "common.h"
12 #include "crypto/sha1.h"
13 #include "crypto/tls.h"
14 #include "eap_common/eap_tlv_common.h"
15 #include "eap_common/eap_peap_common.h"
16 #include "eap_i.h"
17 #include "eap_tls_common.h"
18 #include "eap_config.h"
19 #include "tncc.h"
20
21
22 /* Maximum supported PEAP version
23 * 0 = Microsoft's PEAP version 0; draft-kamath-pppext-peapv0-00.txt
24 * 1 = draft-josefsson-ppext-eap-tls-eap-05.txt
25 */
26 #define EAP_PEAP_VERSION 1
27
28
29 static void eap_peap_deinit(struct eap_sm *sm, void *priv);
30
31
32 struct eap_peap_data {
33 struct eap_ssl_data ssl;
34
35 int peap_version, force_peap_version, force_new_label;
36
37 const struct eap_method *phase2_method;
38 void *phase2_priv;
39 int phase2_success;
40 int phase2_eap_success;
41 int phase2_eap_started;
42
43 struct eap_method_type phase2_type;
44 struct eap_method_type *phase2_types;
45 size_t num_phase2_types;
46
47 int peap_outer_success; /* 0 = PEAP terminated on Phase 2 inner
48 * EAP-Success
49 * 1 = reply with tunneled EAP-Success to inner
50 * EAP-Success and expect AS to send outer
51 * (unencrypted) EAP-Success after this
52 * 2 = reply with PEAP/TLS ACK to inner
53 * EAP-Success and expect AS to send outer
54 * (unencrypted) EAP-Success after this */
55 int resuming; /* starting a resumed session */
56 int reauth; /* reauthentication */
57 u8 *key_data;
58 u8 *session_id;
59 size_t id_len;
60
61 struct wpabuf *pending_phase2_req;
62 struct wpabuf *pending_resp;
63 enum { NO_BINDING, OPTIONAL_BINDING, REQUIRE_BINDING } crypto_binding;
64 int crypto_binding_used;
65 u8 binding_nonce[32];
66 u8 ipmk[40];
67 u8 cmk[20];
68 int soh; /* Whether IF-TNCCS-SOH (Statement of Health; Microsoft NAP)
69 * is enabled. */
70 };
71
72
73 static void eap_peap_parse_phase1(struct eap_peap_data *data,
74 const char *phase1)
75 {
76 const char *pos;
77
78 pos = os_strstr(phase1, "peapver=");
79 if (pos) {
80 data->force_peap_version = atoi(pos + 8);
81 data->peap_version = data->force_peap_version;
82 wpa_printf(MSG_DEBUG, "EAP-PEAP: Forced PEAP version %d",
83 data->force_peap_version);
84 }
85
86 if (os_strstr(phase1, "peaplabel=1")) {
87 data->force_new_label = 1;
88 wpa_printf(MSG_DEBUG, "EAP-PEAP: Force new label for key "
89 "derivation");
90 }
91
92 if (os_strstr(phase1, "peap_outer_success=0")) {
93 data->peap_outer_success = 0;
94 wpa_printf(MSG_DEBUG, "EAP-PEAP: terminate authentication on "
95 "tunneled EAP-Success");
96 } else if (os_strstr(phase1, "peap_outer_success=1")) {
97 data->peap_outer_success = 1;
98 wpa_printf(MSG_DEBUG, "EAP-PEAP: send tunneled EAP-Success "
99 "after receiving tunneled EAP-Success");
100 } else if (os_strstr(phase1, "peap_outer_success=2")) {
101 data->peap_outer_success = 2;
102 wpa_printf(MSG_DEBUG, "EAP-PEAP: send PEAP/TLS ACK after "
103 "receiving tunneled EAP-Success");
104 }
105
106 if (os_strstr(phase1, "crypto_binding=0")) {
107 data->crypto_binding = NO_BINDING;
108 wpa_printf(MSG_DEBUG, "EAP-PEAP: Do not use cryptobinding");
109 } else if (os_strstr(phase1, "crypto_binding=1")) {
110 data->crypto_binding = OPTIONAL_BINDING;
111 wpa_printf(MSG_DEBUG, "EAP-PEAP: Optional cryptobinding");
112 } else if (os_strstr(phase1, "crypto_binding=2")) {
113 data->crypto_binding = REQUIRE_BINDING;
114 wpa_printf(MSG_DEBUG, "EAP-PEAP: Require cryptobinding");
115 }
116
117 #ifdef EAP_TNC
118 if (os_strstr(phase1, "tnc=soh2")) {
119 data->soh = 2;
120 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled");
121 } else if (os_strstr(phase1, "tnc=soh1")) {
122 data->soh = 1;
123 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 1 enabled");
124 } else if (os_strstr(phase1, "tnc=soh")) {
125 data->soh = 2;
126 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled");
127 }
128 #endif /* EAP_TNC */
129 }
130
131
132 static void * eap_peap_init(struct eap_sm *sm)
133 {
134 struct eap_peap_data *data;
135 struct eap_peer_config *config = eap_get_config(sm);
136
137 data = os_zalloc(sizeof(*data));
138 if (data == NULL)
139 return NULL;
140 sm->peap_done = FALSE;
141 data->peap_version = EAP_PEAP_VERSION;
142 data->force_peap_version = -1;
143 data->peap_outer_success = 2;
144 data->crypto_binding = OPTIONAL_BINDING;
145
146 if (config && config->phase1)
147 eap_peap_parse_phase1(data, config->phase1);
148
149 if (eap_peer_select_phase2_methods(config, "auth=",
150 &data->phase2_types,
151 &data->num_phase2_types) < 0) {
152 eap_peap_deinit(sm, data);
153 return NULL;
154 }
155
156 data->phase2_type.vendor = EAP_VENDOR_IETF;
157 data->phase2_type.method = EAP_TYPE_NONE;
158
159 if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_PEAP)) {
160 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to initialize SSL.");
161 eap_peap_deinit(sm, data);
162 return NULL;
163 }
164
165 return data;
166 }
167
168
169 static void eap_peap_free_key(struct eap_peap_data *data)
170 {
171 if (data->key_data) {
172 bin_clear_free(data->key_data, EAP_TLS_KEY_LEN);
173 data->key_data = NULL;
174 }
175 }
176
177
178 static void eap_peap_deinit(struct eap_sm *sm, void *priv)
179 {
180 struct eap_peap_data *data = priv;
181 if (data == NULL)
182 return;
183 if (data->phase2_priv && data->phase2_method)
184 data->phase2_method->deinit(sm, data->phase2_priv);
185 os_free(data->phase2_types);
186 eap_peer_tls_ssl_deinit(sm, &data->ssl);
187 eap_peap_free_key(data);
188 os_free(data->session_id);
189 wpabuf_free(data->pending_phase2_req);
190 wpabuf_free(data->pending_resp);
191 os_free(data);
192 }
193
194
195 /**
196 * eap_tlv_build_nak - Build EAP-TLV NAK message
197 * @id: EAP identifier for the header
198 * @nak_type: TLV type (EAP_TLV_*)
199 * Returns: Buffer to the allocated EAP-TLV NAK message or %NULL on failure
200 *
201 * This function builds an EAP-TLV NAK message. The caller is responsible for
202 * freeing the returned buffer.
203 */
204 static struct wpabuf * eap_tlv_build_nak(int id, u16 nak_type)
205 {
206 struct wpabuf *msg;
207
208 msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, 10,
209 EAP_CODE_RESPONSE, id);
210 if (msg == NULL)
211 return NULL;
212
213 wpabuf_put_u8(msg, 0x80); /* Mandatory */
214 wpabuf_put_u8(msg, EAP_TLV_NAK_TLV);
215 wpabuf_put_be16(msg, 6); /* Length */
216 wpabuf_put_be32(msg, 0); /* Vendor-Id */
217 wpabuf_put_be16(msg, nak_type); /* NAK-Type */
218
219 return msg;
220 }
221
222
223 static int eap_peap_get_isk(struct eap_sm *sm, struct eap_peap_data *data,
224 u8 *isk, size_t isk_len)
225 {
226 u8 *key;
227 size_t key_len;
228
229 os_memset(isk, 0, isk_len);
230 if (data->phase2_method == NULL || data->phase2_priv == NULL ||
231 data->phase2_method->isKeyAvailable == NULL ||
232 data->phase2_method->getKey == NULL)
233 return 0;
234
235 if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
236 (key = data->phase2_method->getKey(sm, data->phase2_priv,
237 &key_len)) == NULL) {
238 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not get key material "
239 "from Phase 2");
240 return -1;
241 }
242
243 if (key_len > isk_len)
244 key_len = isk_len;
245 os_memcpy(isk, key, key_len);
246 os_free(key);
247
248 return 0;
249 }
250
251
252 static int eap_peap_derive_cmk(struct eap_sm *sm, struct eap_peap_data *data)
253 {
254 u8 *tk;
255 u8 isk[32], imck[60];
256 int resumed;
257
258 /*
259 * Tunnel key (TK) is the first 60 octets of the key generated by
260 * phase 1 of PEAP (based on TLS).
261 */
262 tk = data->key_data;
263 if (tk == NULL)
264 return -1;
265 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TK", tk, 60);
266
267 resumed = tls_connection_resumed(sm->ssl_ctx, data->ssl.conn);
268 wpa_printf(MSG_DEBUG,
269 "EAP-PEAP: CMK derivation - reauth=%d resumed=%d phase2_eap_started=%d phase2_success=%d",
270 data->reauth, resumed, data->phase2_eap_started,
271 data->phase2_success);
272 if (data->reauth && !data->phase2_eap_started && resumed) {
273 /* Fast-connect: IPMK|CMK = TK */
274 os_memcpy(data->ipmk, tk, 40);
275 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK from TK",
276 data->ipmk, 40);
277 os_memcpy(data->cmk, tk + 40, 20);
278 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK from TK",
279 data->cmk, 20);
280 return 0;
281 }
282
283 if (eap_peap_get_isk(sm, data, isk, sizeof(isk)) < 0)
284 return -1;
285 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: ISK", isk, sizeof(isk));
286
287 /*
288 * IPMK Seed = "Inner Methods Compound Keys" | ISK
289 * TempKey = First 40 octets of TK
290 * IPMK|CMK = PRF+(TempKey, IPMK Seed, 60)
291 * (note: draft-josefsson-pppext-eap-tls-eap-10.txt includes a space
292 * in the end of the label just before ISK; is that just a typo?)
293 */
294 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TempKey", tk, 40);
295 if (peap_prfplus(data->peap_version, tk, 40,
296 "Inner Methods Compound Keys",
297 isk, sizeof(isk), imck, sizeof(imck)) < 0)
298 return -1;
299 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IMCK (IPMKj)",
300 imck, sizeof(imck));
301
302 os_memcpy(data->ipmk, imck, 40);
303 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK (S-IPMKj)", data->ipmk, 40);
304 os_memcpy(data->cmk, imck + 40, 20);
305 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK (CMKj)", data->cmk, 20);
306
307 return 0;
308 }
309
310
311 static int eap_tlv_add_cryptobinding(struct eap_sm *sm,
312 struct eap_peap_data *data,
313 struct wpabuf *buf)
314 {
315 u8 *mac;
316 u8 eap_type = EAP_TYPE_PEAP;
317 const u8 *addr[2];
318 size_t len[2];
319 u16 tlv_type;
320
321 /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
322 addr[0] = wpabuf_put(buf, 0);
323 len[0] = 60;
324 addr[1] = &eap_type;
325 len[1] = 1;
326
327 tlv_type = EAP_TLV_CRYPTO_BINDING_TLV;
328 wpabuf_put_be16(buf, tlv_type);
329 wpabuf_put_be16(buf, 56);
330
331 wpabuf_put_u8(buf, 0); /* Reserved */
332 wpabuf_put_u8(buf, data->peap_version); /* Version */
333 wpabuf_put_u8(buf, data->peap_version); /* RecvVersion */
334 wpabuf_put_u8(buf, 1); /* SubType: 0 = Request, 1 = Response */
335 wpabuf_put_data(buf, data->binding_nonce, 32); /* Nonce */
336 mac = wpabuf_put(buf, 20); /* Compound_MAC */
337 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC CMK", data->cmk, 20);
338 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 1",
339 addr[0], len[0]);
340 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 2",
341 addr[1], len[1]);
342 if (hmac_sha1_vector(data->cmk, 20, 2, addr, len, mac) < 0)
343 return -1;
344 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC", mac, SHA1_MAC_LEN);
345 data->crypto_binding_used = 1;
346
347 return 0;
348 }
349
350
351 /**
352 * eap_tlv_build_result - Build EAP-TLV Result message
353 * @id: EAP identifier for the header
354 * @status: Status (EAP_TLV_RESULT_SUCCESS or EAP_TLV_RESULT_FAILURE)
355 * Returns: Buffer to the allocated EAP-TLV Result message or %NULL on failure
356 *
357 * This function builds an EAP-TLV Result message. The caller is responsible
358 * for freeing the returned buffer.
359 */
360 static struct wpabuf * eap_tlv_build_result(struct eap_sm *sm,
361 struct eap_peap_data *data,
362 int crypto_tlv_used,
363 int id, u16 status)
364 {
365 struct wpabuf *msg;
366 size_t len;
367
368 if (data->crypto_binding == NO_BINDING)
369 crypto_tlv_used = 0;
370
371 len = 6;
372 if (crypto_tlv_used)
373 len += 60; /* Cryptobinding TLV */
374 msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, len,
375 EAP_CODE_RESPONSE, id);
376 if (msg == NULL)
377 return NULL;
378
379 wpabuf_put_u8(msg, 0x80); /* Mandatory */
380 wpabuf_put_u8(msg, EAP_TLV_RESULT_TLV);
381 wpabuf_put_be16(msg, 2); /* Length */
382 wpabuf_put_be16(msg, status); /* Status */
383
384 if (crypto_tlv_used && eap_tlv_add_cryptobinding(sm, data, msg)) {
385 wpabuf_free(msg);
386 return NULL;
387 }
388
389 return msg;
390 }
391
392
393 static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
394 struct eap_peap_data *data,
395 const u8 *crypto_tlv,
396 size_t crypto_tlv_len)
397 {
398 u8 buf[61], mac[SHA1_MAC_LEN];
399 const u8 *pos;
400
401 if (eap_peap_derive_cmk(sm, data) < 0) {
402 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not derive CMK");
403 return -1;
404 }
405
406 if (crypto_tlv_len != 4 + 56) {
407 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid cryptobinding TLV "
408 "length %d", (int) crypto_tlv_len);
409 return -1;
410 }
411
412 pos = crypto_tlv;
413 pos += 4; /* TLV header */
414 if (pos[1] != data->peap_version) {
415 wpa_printf(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV Version "
416 "mismatch (was %d; expected %d)",
417 pos[1], data->peap_version);
418 return -1;
419 }
420
421 if (pos[3] != 0) {
422 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV "
423 "SubType %d", pos[3]);
424 return -1;
425 }
426 pos += 4;
427 os_memcpy(data->binding_nonce, pos, 32);
428 pos += 32; /* Nonce */
429
430 /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
431 os_memcpy(buf, crypto_tlv, 60);
432 os_memset(buf + 4 + 4 + 32, 0, 20); /* Compound_MAC */
433 buf[60] = EAP_TYPE_PEAP;
434 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Compound_MAC data",
435 buf, sizeof(buf));
436 hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);
437
438 if (os_memcmp_const(mac, pos, SHA1_MAC_LEN) != 0) {
439 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
440 "cryptobinding TLV");
441 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received MAC",
442 pos, SHA1_MAC_LEN);
443 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Expected MAC",
444 mac, SHA1_MAC_LEN);
445 return -1;
446 }
447
448 wpa_printf(MSG_DEBUG, "EAP-PEAP: Valid cryptobinding TLV received");
449
450 return 0;
451 }
452
453
454 /**
455 * eap_tlv_process - Process a received EAP-TLV message and generate a response
456 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
457 * @ret: Return values from EAP request validation and processing
458 * @req: EAP-TLV request to be processed. The caller must have validated that
459 * the buffer is large enough to contain full request (hdr->length bytes) and
460 * that the EAP type is EAP_TYPE_TLV.
461 * @resp: Buffer to return a pointer to the allocated response message. This
462 * field should be initialized to %NULL before the call. The value will be
463 * updated if a response message is generated. The caller is responsible for
464 * freeing the allocated message.
465 * @force_failure: Force negotiation to fail
466 * Returns: 0 on success, -1 on failure
467 */
468 static int eap_tlv_process(struct eap_sm *sm, struct eap_peap_data *data,
469 struct eap_method_ret *ret,
470 const struct wpabuf *req, struct wpabuf **resp,
471 int force_failure)
472 {
473 size_t left, tlv_len;
474 const u8 *pos;
475 const u8 *result_tlv = NULL, *crypto_tlv = NULL;
476 size_t result_tlv_len = 0, crypto_tlv_len = 0;
477 int tlv_type, mandatory;
478
479 /* Parse TLVs */
480 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, req, &left);
481 if (pos == NULL)
482 return -1;
483 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Received TLVs", pos, left);
484 while (left >= 4) {
485 mandatory = !!(pos[0] & 0x80);
486 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
487 pos += 2;
488 tlv_len = WPA_GET_BE16(pos);
489 pos += 2;
490 left -= 4;
491 if (tlv_len > left) {
492 wpa_printf(MSG_DEBUG, "EAP-TLV: TLV underrun "
493 "(tlv_len=%lu left=%lu)",
494 (unsigned long) tlv_len,
495 (unsigned long) left);
496 return -1;
497 }
498 switch (tlv_type) {
499 case EAP_TLV_RESULT_TLV:
500 result_tlv = pos;
501 result_tlv_len = tlv_len;
502 break;
503 case EAP_TLV_CRYPTO_BINDING_TLV:
504 crypto_tlv = pos;
505 crypto_tlv_len = tlv_len;
506 break;
507 default:
508 wpa_printf(MSG_DEBUG, "EAP-TLV: Unsupported TLV Type "
509 "%d%s", tlv_type,
510 mandatory ? " (mandatory)" : "");
511 if (mandatory) {
512 /* NAK TLV and ignore all TLVs in this packet.
513 */
514 *resp = eap_tlv_build_nak(eap_get_id(req),
515 tlv_type);
516 return *resp == NULL ? -1 : 0;
517 }
518 /* Ignore this TLV, but process other TLVs */
519 break;
520 }
521
522 pos += tlv_len;
523 left -= tlv_len;
524 }
525 if (left) {
526 wpa_printf(MSG_DEBUG, "EAP-TLV: Last TLV too short in "
527 "Request (left=%lu)", (unsigned long) left);
528 return -1;
529 }
530
531 /* Process supported TLVs */
532 if (crypto_tlv && data->crypto_binding != NO_BINDING) {
533 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV",
534 crypto_tlv, crypto_tlv_len);
535 if (eap_tlv_validate_cryptobinding(sm, data, crypto_tlv - 4,
536 crypto_tlv_len + 4) < 0) {
537 if (result_tlv == NULL)
538 return -1;
539 force_failure = 1;
540 crypto_tlv = NULL; /* do not include Cryptobinding TLV
541 * in response, if the received
542 * cryptobinding was invalid. */
543 }
544 } else if (!crypto_tlv && data->crypto_binding == REQUIRE_BINDING) {
545 wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV");
546 return -1;
547 }
548
549 if (result_tlv) {
550 int status, resp_status;
551 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Result TLV",
552 result_tlv, result_tlv_len);
553 if (result_tlv_len < 2) {
554 wpa_printf(MSG_INFO, "EAP-TLV: Too short Result TLV "
555 "(len=%lu)",
556 (unsigned long) result_tlv_len);
557 return -1;
558 }
559 status = WPA_GET_BE16(result_tlv);
560 if (status == EAP_TLV_RESULT_SUCCESS) {
561 wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Success "
562 "- EAP-TLV/Phase2 Completed");
563 if (force_failure) {
564 wpa_printf(MSG_INFO, "EAP-TLV: Earlier failure"
565 " - force failed Phase 2");
566 resp_status = EAP_TLV_RESULT_FAILURE;
567 ret->decision = DECISION_FAIL;
568 } else {
569 resp_status = EAP_TLV_RESULT_SUCCESS;
570 ret->decision = DECISION_UNCOND_SUCC;
571 }
572 } else if (status == EAP_TLV_RESULT_FAILURE) {
573 wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Failure");
574 resp_status = EAP_TLV_RESULT_FAILURE;
575 ret->decision = DECISION_FAIL;
576 } else {
577 wpa_printf(MSG_INFO, "EAP-TLV: Unknown TLV Result "
578 "Status %d", status);
579 resp_status = EAP_TLV_RESULT_FAILURE;
580 ret->decision = DECISION_FAIL;
581 }
582 ret->methodState = METHOD_DONE;
583
584 *resp = eap_tlv_build_result(sm, data, crypto_tlv != NULL,
585 eap_get_id(req), resp_status);
586 }
587
588 return 0;
589 }
590
591
592 static int eap_peap_phase2_request(struct eap_sm *sm,
593 struct eap_peap_data *data,
594 struct eap_method_ret *ret,
595 struct wpabuf *req,
596 struct wpabuf **resp)
597 {
598 struct eap_hdr *hdr = wpabuf_mhead(req);
599 size_t len = be_to_host16(hdr->length);
600 u8 *pos;
601 struct eap_method_ret iret;
602 struct eap_peer_config *config = eap_get_config(sm);
603
604 if (len <= sizeof(struct eap_hdr)) {
605 wpa_printf(MSG_INFO, "EAP-PEAP: too short "
606 "Phase 2 request (len=%lu)", (unsigned long) len);
607 return -1;
608 }
609 pos = (u8 *) (hdr + 1);
610 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Request: type=%d", *pos);
611 switch (*pos) {
612 case EAP_TYPE_IDENTITY:
613 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
614 break;
615 case EAP_TYPE_TLV:
616 os_memset(&iret, 0, sizeof(iret));
617 if (eap_tlv_process(sm, data, &iret, req, resp,
618 data->phase2_eap_started &&
619 !data->phase2_eap_success)) {
620 ret->methodState = METHOD_DONE;
621 ret->decision = DECISION_FAIL;
622 return -1;
623 }
624 if (iret.methodState == METHOD_DONE ||
625 iret.methodState == METHOD_MAY_CONT) {
626 ret->methodState = iret.methodState;
627 ret->decision = iret.decision;
628 data->phase2_success = 1;
629 }
630 break;
631 case EAP_TYPE_EXPANDED:
632 #ifdef EAP_TNC
633 if (data->soh) {
634 const u8 *epos;
635 size_t eleft;
636
637 epos = eap_hdr_validate(EAP_VENDOR_MICROSOFT, 0x21,
638 req, &eleft);
639 if (epos) {
640 struct wpabuf *buf;
641 wpa_printf(MSG_DEBUG,
642 "EAP-PEAP: SoH EAP Extensions");
643 buf = tncc_process_soh_request(data->soh,
644 epos, eleft);
645 if (buf) {
646 *resp = eap_msg_alloc(
647 EAP_VENDOR_MICROSOFT, 0x21,
648 wpabuf_len(buf),
649 EAP_CODE_RESPONSE,
650 hdr->identifier);
651 if (*resp == NULL) {
652 ret->methodState = METHOD_DONE;
653 ret->decision = DECISION_FAIL;
654 wpabuf_free(buf);
655 return -1;
656 }
657 wpabuf_put_buf(*resp, buf);
658 wpabuf_free(buf);
659 break;
660 }
661 }
662 }
663 #endif /* EAP_TNC */
664 /* fall through */
665 default:
666 if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
667 data->phase2_type.method == EAP_TYPE_NONE) {
668 size_t i;
669 for (i = 0; i < data->num_phase2_types; i++) {
670 if (data->phase2_types[i].vendor !=
671 EAP_VENDOR_IETF ||
672 data->phase2_types[i].method != *pos)
673 continue;
674
675 data->phase2_type.vendor =
676 data->phase2_types[i].vendor;
677 data->phase2_type.method =
678 data->phase2_types[i].method;
679 wpa_printf(MSG_DEBUG, "EAP-PEAP: Selected "
680 "Phase 2 EAP vendor %d method %d",
681 data->phase2_type.vendor,
682 data->phase2_type.method);
683 break;
684 }
685 }
686 if (*pos != data->phase2_type.method ||
687 *pos == EAP_TYPE_NONE) {
688 if (eap_peer_tls_phase2_nak(data->phase2_types,
689 data->num_phase2_types,
690 hdr, resp))
691 return -1;
692 return 0;
693 }
694
695 if (data->phase2_priv == NULL) {
696 data->phase2_method = eap_peer_get_eap_method(
697 data->phase2_type.vendor,
698 data->phase2_type.method);
699 if (data->phase2_method) {
700 sm->init_phase2 = 1;
701 data->phase2_priv =
702 data->phase2_method->init(sm);
703 sm->init_phase2 = 0;
704 }
705 }
706 if (data->phase2_priv == NULL || data->phase2_method == NULL) {
707 wpa_printf(MSG_INFO, "EAP-PEAP: failed to initialize "
708 "Phase 2 EAP method %d", *pos);
709 ret->methodState = METHOD_DONE;
710 ret->decision = DECISION_FAIL;
711 return -1;
712 }
713 data->phase2_eap_started = 1;
714 os_memset(&iret, 0, sizeof(iret));
715 *resp = data->phase2_method->process(sm, data->phase2_priv,
716 &iret, req);
717 if ((iret.methodState == METHOD_DONE ||
718 iret.methodState == METHOD_MAY_CONT) &&
719 (iret.decision == DECISION_UNCOND_SUCC ||
720 iret.decision == DECISION_COND_SUCC)) {
721 data->phase2_eap_success = 1;
722 data->phase2_success = 1;
723 }
724 break;
725 }
726
727 if (*resp == NULL &&
728 (config->pending_req_identity || config->pending_req_password ||
729 config->pending_req_otp || config->pending_req_new_password ||
730 config->pending_req_sim)) {
731 wpabuf_free(data->pending_phase2_req);
732 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
733 }
734
735 return 0;
736 }
737
738
739 static int eap_peap_decrypt(struct eap_sm *sm, struct eap_peap_data *data,
740 struct eap_method_ret *ret,
741 const struct eap_hdr *req,
742 const struct wpabuf *in_data,
743 struct wpabuf **out_data)
744 {
745 struct wpabuf *in_decrypted = NULL;
746 int res, skip_change = 0;
747 struct eap_hdr *hdr, *rhdr;
748 struct wpabuf *resp = NULL;
749 size_t len;
750
751 wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
752 " Phase 2", (unsigned long) wpabuf_len(in_data));
753
754 if (data->pending_phase2_req) {
755 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 request - "
756 "skip decryption and use old data");
757 /* Clear TLS reassembly state. */
758 eap_peer_tls_reset_input(&data->ssl);
759 in_decrypted = data->pending_phase2_req;
760 data->pending_phase2_req = NULL;
761 skip_change = 1;
762 goto continue_req;
763 }
764
765 if (wpabuf_len(in_data) == 0 && sm->workaround &&
766 data->phase2_success) {
767 /*
768 * Cisco ACS seems to be using TLS ACK to terminate
769 * EAP-PEAPv0/GTC. Try to reply with TLS ACK.
770 */
771 wpa_printf(MSG_DEBUG, "EAP-PEAP: Received TLS ACK, but "
772 "expected data - acknowledge with TLS ACK since "
773 "Phase 2 has been completed");
774 ret->decision = DECISION_COND_SUCC;
775 ret->methodState = METHOD_DONE;
776 return 1;
777 } else if (wpabuf_len(in_data) == 0) {
778 /* Received TLS ACK - requesting more fragments */
779 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
780 data->peap_version,
781 req->identifier, NULL, out_data);
782 }
783
784 res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
785 if (res)
786 return res;
787
788 continue_req:
789 wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP",
790 in_decrypted);
791
792 hdr = wpabuf_mhead(in_decrypted);
793 if (wpabuf_len(in_decrypted) == 5 && hdr->code == EAP_CODE_REQUEST &&
794 be_to_host16(hdr->length) == 5 &&
795 eap_get_type(in_decrypted) == EAP_TYPE_IDENTITY) {
796 /* At least FreeRADIUS seems to send full EAP header with
797 * EAP Request Identity */
798 skip_change = 1;
799 }
800 if (wpabuf_len(in_decrypted) >= 5 && hdr->code == EAP_CODE_REQUEST &&
801 eap_get_type(in_decrypted) == EAP_TYPE_TLV) {
802 skip_change = 1;
803 }
804
805 if (data->peap_version == 0 && !skip_change) {
806 struct eap_hdr *nhdr;
807 struct wpabuf *nmsg = wpabuf_alloc(sizeof(struct eap_hdr) +
808 wpabuf_len(in_decrypted));
809 if (nmsg == NULL) {
810 wpabuf_free(in_decrypted);
811 return 0;
812 }
813 nhdr = wpabuf_put(nmsg, sizeof(*nhdr));
814 wpabuf_put_buf(nmsg, in_decrypted);
815 nhdr->code = req->code;
816 nhdr->identifier = req->identifier;
817 nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
818 wpabuf_len(in_decrypted));
819
820 wpabuf_free(in_decrypted);
821 in_decrypted = nmsg;
822 }
823
824 hdr = wpabuf_mhead(in_decrypted);
825 if (wpabuf_len(in_decrypted) < sizeof(*hdr)) {
826 wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
827 "EAP frame (len=%lu)",
828 (unsigned long) wpabuf_len(in_decrypted));
829 wpabuf_free(in_decrypted);
830 return 0;
831 }
832 len = be_to_host16(hdr->length);
833 if (len > wpabuf_len(in_decrypted)) {
834 wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in "
835 "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
836 (unsigned long) wpabuf_len(in_decrypted),
837 (unsigned long) len);
838 wpabuf_free(in_decrypted);
839 return 0;
840 }
841 if (len < wpabuf_len(in_decrypted)) {
842 wpa_printf(MSG_INFO, "EAP-PEAP: Odd.. Phase 2 EAP header has "
843 "shorter length than full decrypted data "
844 "(%lu < %lu)",
845 (unsigned long) len,
846 (unsigned long) wpabuf_len(in_decrypted));
847 }
848 wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d "
849 "identifier=%d length=%lu", hdr->code, hdr->identifier,
850 (unsigned long) len);
851 switch (hdr->code) {
852 case EAP_CODE_REQUEST:
853 if (eap_peap_phase2_request(sm, data, ret, in_decrypted,
854 &resp)) {
855 wpabuf_free(in_decrypted);
856 wpa_printf(MSG_INFO, "EAP-PEAP: Phase2 Request "
857 "processing failed");
858 return 0;
859 }
860 break;
861 case EAP_CODE_SUCCESS:
862 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success");
863 if (data->peap_version == 1) {
864 /* EAP-Success within TLS tunnel is used to indicate
865 * shutdown of the TLS channel. The authentication has
866 * been completed. */
867 if (data->phase2_eap_started &&
868 !data->phase2_eap_success) {
869 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 "
870 "Success used to indicate success, "
871 "but Phase 2 EAP was not yet "
872 "completed successfully");
873 ret->methodState = METHOD_DONE;
874 ret->decision = DECISION_FAIL;
875 wpabuf_free(in_decrypted);
876 return 0;
877 }
878 wpa_printf(MSG_DEBUG, "EAP-PEAP: Version 1 - "
879 "EAP-Success within TLS tunnel - "
880 "authentication completed");
881 ret->decision = DECISION_UNCOND_SUCC;
882 ret->methodState = METHOD_DONE;
883 data->phase2_success = 1;
884 if (data->peap_outer_success == 2) {
885 wpabuf_free(in_decrypted);
886 wpa_printf(MSG_DEBUG, "EAP-PEAP: Use TLS ACK "
887 "to finish authentication");
888 return 1;
889 } else if (data->peap_outer_success == 1) {
890 /* Reply with EAP-Success within the TLS
891 * channel to complete the authentication. */
892 resp = wpabuf_alloc(sizeof(struct eap_hdr));
893 if (resp) {
894 rhdr = wpabuf_put(resp, sizeof(*rhdr));
895 rhdr->code = EAP_CODE_SUCCESS;
896 rhdr->identifier = hdr->identifier;
897 rhdr->length =
898 host_to_be16(sizeof(*rhdr));
899 }
900 } else {
901 /* No EAP-Success expected for Phase 1 (outer,
902 * unencrypted auth), so force EAP state
903 * machine to SUCCESS state. */
904 sm->peap_done = TRUE;
905 }
906 } else {
907 /* FIX: ? */
908 }
909 break;
910 case EAP_CODE_FAILURE:
911 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure");
912 ret->decision = DECISION_FAIL;
913 ret->methodState = METHOD_MAY_CONT;
914 ret->allowNotifications = FALSE;
915 /* Reply with EAP-Failure within the TLS channel to complete
916 * failure reporting. */
917 resp = wpabuf_alloc(sizeof(struct eap_hdr));
918 if (resp) {
919 rhdr = wpabuf_put(resp, sizeof(*rhdr));
920 rhdr->code = EAP_CODE_FAILURE;
921 rhdr->identifier = hdr->identifier;
922 rhdr->length = host_to_be16(sizeof(*rhdr));
923 }
924 break;
925 default:
926 wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
927 "Phase 2 EAP header", hdr->code);
928 break;
929 }
930
931 wpabuf_free(in_decrypted);
932
933 if (resp) {
934 int skip_change2 = 0;
935 struct wpabuf *rmsg, buf;
936
937 wpa_hexdump_buf_key(MSG_DEBUG,
938 "EAP-PEAP: Encrypting Phase 2 data", resp);
939 /* PEAP version changes */
940 if (wpabuf_len(resp) >= 5 &&
941 wpabuf_head_u8(resp)[0] == EAP_CODE_RESPONSE &&
942 eap_get_type(resp) == EAP_TYPE_TLV)
943 skip_change2 = 1;
944 rmsg = resp;
945 if (data->peap_version == 0 && !skip_change2) {
946 wpabuf_set(&buf, wpabuf_head_u8(resp) +
947 sizeof(struct eap_hdr),
948 wpabuf_len(resp) - sizeof(struct eap_hdr));
949 rmsg = &buf;
950 }
951
952 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
953 data->peap_version, req->identifier,
954 rmsg, out_data)) {
955 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to encrypt "
956 "a Phase 2 frame");
957 }
958 wpabuf_free(resp);
959 }
960
961 return 0;
962 }
963
964
965 static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv,
966 struct eap_method_ret *ret,
967 const struct wpabuf *reqData)
968 {
969 const struct eap_hdr *req;
970 size_t left;
971 int res;
972 u8 flags, id;
973 struct wpabuf *resp;
974 const u8 *pos;
975 struct eap_peap_data *data = priv;
976 struct wpabuf msg;
977
978 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_PEAP, ret,
979 reqData, &left, &flags);
980 if (pos == NULL)
981 return NULL;
982 req = wpabuf_head(reqData);
983 id = req->identifier;
984
985 if (flags & EAP_TLS_FLAGS_START) {
986 wpa_printf(MSG_DEBUG, "EAP-PEAP: Start (server ver=%d, own "
987 "ver=%d)", flags & EAP_TLS_VERSION_MASK,
988 data->peap_version);
989 if ((flags & EAP_TLS_VERSION_MASK) < data->peap_version)
990 data->peap_version = flags & EAP_TLS_VERSION_MASK;
991 if (data->force_peap_version >= 0 &&
992 data->force_peap_version != data->peap_version) {
993 wpa_printf(MSG_WARNING, "EAP-PEAP: Failed to select "
994 "forced PEAP version %d",
995 data->force_peap_version);
996 ret->methodState = METHOD_DONE;
997 ret->decision = DECISION_FAIL;
998 ret->allowNotifications = FALSE;
999 return NULL;
1000 }
1001 wpa_printf(MSG_DEBUG, "EAP-PEAP: Using PEAP version %d",
1002 data->peap_version);
1003 left = 0; /* make sure that this frame is empty, even though it
1004 * should always be, anyway */
1005 }
1006
1007 wpabuf_set(&msg, pos, left);
1008
1009 resp = NULL;
1010 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1011 !data->resuming) {
1012 res = eap_peap_decrypt(sm, data, ret, req, &msg, &resp);
1013 } else {
1014 if (sm->waiting_ext_cert_check && data->pending_resp) {
1015 struct eap_peer_config *config = eap_get_config(sm);
1016
1017 if (config->pending_ext_cert_check ==
1018 EXT_CERT_CHECK_GOOD) {
1019 wpa_printf(MSG_DEBUG,
1020 "EAP-PEAP: External certificate check succeeded - continue handshake");
1021 resp = data->pending_resp;
1022 data->pending_resp = NULL;
1023 sm->waiting_ext_cert_check = 0;
1024 return resp;
1025 }
1026
1027 if (config->pending_ext_cert_check ==
1028 EXT_CERT_CHECK_BAD) {
1029 wpa_printf(MSG_DEBUG,
1030 "EAP-PEAP: External certificate check failed - force authentication failure");
1031 ret->methodState = METHOD_DONE;
1032 ret->decision = DECISION_FAIL;
1033 sm->waiting_ext_cert_check = 0;
1034 return NULL;
1035 }
1036
1037 wpa_printf(MSG_DEBUG,
1038 "EAP-PEAP: Continuing to wait external server certificate validation");
1039 return NULL;
1040 }
1041
1042 res = eap_peer_tls_process_helper(sm, &data->ssl,
1043 EAP_TYPE_PEAP,
1044 data->peap_version, id, &msg,
1045 &resp);
1046
1047 if (res < 0) {
1048 wpa_printf(MSG_DEBUG,
1049 "EAP-PEAP: TLS processing failed");
1050 ret->methodState = METHOD_DONE;
1051 ret->decision = DECISION_FAIL;
1052 return resp;
1053 }
1054
1055
1056 if (sm->waiting_ext_cert_check) {
1057 wpa_printf(MSG_DEBUG,
1058 "EAP-PEAP: Waiting external server certificate validation");
1059 wpabuf_free(data->pending_resp);
1060 data->pending_resp = resp;
1061 return NULL;
1062 }
1063
1064 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1065 char *label;
1066 wpa_printf(MSG_DEBUG,
1067 "EAP-PEAP: TLS done, proceed to Phase 2");
1068 eap_peap_free_key(data);
1069 /* draft-josefsson-ppext-eap-tls-eap-05.txt
1070 * specifies that PEAPv1 would use "client PEAP
1071 * encryption" as the label. However, most existing
1072 * PEAPv1 implementations seem to be using the old
1073 * label, "client EAP encryption", instead. Use the old
1074 * label by default, but allow it to be configured with
1075 * phase1 parameter peaplabel=1. */
1076 if (data->force_new_label)
1077 label = "client PEAP encryption";
1078 else
1079 label = "client EAP encryption";
1080 wpa_printf(MSG_DEBUG, "EAP-PEAP: using label '%s' in "
1081 "key derivation", label);
1082 data->key_data =
1083 eap_peer_tls_derive_key(sm, &data->ssl, label,
1084 EAP_TLS_KEY_LEN);
1085 if (data->key_data) {
1086 wpa_hexdump_key(MSG_DEBUG,
1087 "EAP-PEAP: Derived key",
1088 data->key_data,
1089 EAP_TLS_KEY_LEN);
1090 } else {
1091 wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to "
1092 "derive key");
1093 }
1094
1095 os_free(data->session_id);
1096 data->session_id =
1097 eap_peer_tls_derive_session_id(sm, &data->ssl,
1098 EAP_TYPE_PEAP,
1099 &data->id_len);
1100 if (data->session_id) {
1101 wpa_hexdump(MSG_DEBUG,
1102 "EAP-PEAP: Derived Session-Id",
1103 data->session_id, data->id_len);
1104 } else {
1105 wpa_printf(MSG_ERROR, "EAP-PEAP: Failed to "
1106 "derive Session-Id");
1107 }
1108
1109 if (sm->workaround && data->resuming) {
1110 /*
1111 * At least few RADIUS servers (Aegis v1.1.6;
1112 * but not v1.1.4; and Cisco ACS) seem to be
1113 * terminating PEAPv1 (Aegis) or PEAPv0 (Cisco
1114 * ACS) session resumption with outer
1115 * EAP-Success. This does not seem to follow
1116 * draft-josefsson-pppext-eap-tls-eap-05.txt
1117 * section 4.2, so only allow this if EAP
1118 * workarounds are enabled.
1119 */
1120 wpa_printf(MSG_DEBUG, "EAP-PEAP: Workaround - "
1121 "allow outer EAP-Success to "
1122 "terminate PEAP resumption");
1123 ret->decision = DECISION_COND_SUCC;
1124 data->phase2_success = 1;
1125 }
1126
1127 data->resuming = 0;
1128 }
1129
1130 if (res == 2) {
1131 /*
1132 * Application data included in the handshake message.
1133 */
1134 wpabuf_free(data->pending_phase2_req);
1135 data->pending_phase2_req = resp;
1136 resp = NULL;
1137 res = eap_peap_decrypt(sm, data, ret, req, &msg,
1138 &resp);
1139 }
1140 }
1141
1142 if (ret->methodState == METHOD_DONE) {
1143 ret->allowNotifications = FALSE;
1144 }
1145
1146 if (res == 1) {
1147 wpabuf_free(resp);
1148 return eap_peer_tls_build_ack(id, EAP_TYPE_PEAP,
1149 data->peap_version);
1150 }
1151
1152 return resp;
1153 }
1154
1155
1156 static Boolean eap_peap_has_reauth_data(struct eap_sm *sm, void *priv)
1157 {
1158 struct eap_peap_data *data = priv;
1159 return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1160 data->phase2_success;
1161 }
1162
1163
1164 static void eap_peap_deinit_for_reauth(struct eap_sm *sm, void *priv)
1165 {
1166 struct eap_peap_data *data = priv;
1167
1168 if (data->phase2_priv && data->phase2_method &&
1169 data->phase2_method->deinit_for_reauth)
1170 data->phase2_method->deinit_for_reauth(sm, data->phase2_priv);
1171 wpabuf_free(data->pending_phase2_req);
1172 data->pending_phase2_req = NULL;
1173 wpabuf_free(data->pending_resp);
1174 data->pending_resp = NULL;
1175 data->crypto_binding_used = 0;
1176 }
1177
1178
1179 static void * eap_peap_init_for_reauth(struct eap_sm *sm, void *priv)
1180 {
1181 struct eap_peap_data *data = priv;
1182 eap_peap_free_key(data);
1183 os_free(data->session_id);
1184 data->session_id = NULL;
1185 if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1186 os_free(data);
1187 return NULL;
1188 }
1189 if (data->phase2_priv && data->phase2_method &&
1190 data->phase2_method->init_for_reauth)
1191 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1192 data->phase2_success = 0;
1193 data->phase2_eap_success = 0;
1194 data->phase2_eap_started = 0;
1195 data->resuming = 1;
1196 data->reauth = 1;
1197 sm->peap_done = FALSE;
1198 return priv;
1199 }
1200
1201
1202 static int eap_peap_get_status(struct eap_sm *sm, void *priv, char *buf,
1203 size_t buflen, int verbose)
1204 {
1205 struct eap_peap_data *data = priv;
1206 int len, ret;
1207
1208 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1209 if (data->phase2_method) {
1210 ret = os_snprintf(buf + len, buflen - len,
1211 "EAP-PEAPv%d Phase2 method=%s\n",
1212 data->peap_version,
1213 data->phase2_method->name);
1214 if (os_snprintf_error(buflen - len, ret))
1215 return len;
1216 len += ret;
1217 }
1218 return len;
1219 }
1220
1221
1222 static Boolean eap_peap_isKeyAvailable(struct eap_sm *sm, void *priv)
1223 {
1224 struct eap_peap_data *data = priv;
1225 return data->key_data != NULL && data->phase2_success;
1226 }
1227
1228
1229 static u8 * eap_peap_getKey(struct eap_sm *sm, void *priv, size_t *len)
1230 {
1231 struct eap_peap_data *data = priv;
1232 u8 *key;
1233
1234 if (data->key_data == NULL || !data->phase2_success)
1235 return NULL;
1236
1237 key = os_malloc(EAP_TLS_KEY_LEN);
1238 if (key == NULL)
1239 return NULL;
1240
1241 *len = EAP_TLS_KEY_LEN;
1242
1243 if (data->crypto_binding_used) {
1244 u8 csk[128];
1245 /*
1246 * Note: It looks like Microsoft implementation requires null
1247 * termination for this label while the one used for deriving
1248 * IPMK|CMK did not use null termination.
1249 */
1250 if (peap_prfplus(data->peap_version, data->ipmk, 40,
1251 "Session Key Generating Function",
1252 (u8 *) "\00", 1, csk, sizeof(csk)) < 0) {
1253 os_free(key);
1254 return NULL;
1255 }
1256 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk));
1257 os_memcpy(key, csk, EAP_TLS_KEY_LEN);
1258 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
1259 key, EAP_TLS_KEY_LEN);
1260 } else
1261 os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
1262
1263 return key;
1264 }
1265
1266
1267 static u8 * eap_peap_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1268 {
1269 struct eap_peap_data *data = priv;
1270 u8 *id;
1271
1272 if (data->session_id == NULL || !data->phase2_success)
1273 return NULL;
1274
1275 id = os_memdup(data->session_id, data->id_len);
1276 if (id == NULL)
1277 return NULL;
1278
1279 *len = data->id_len;
1280
1281 return id;
1282 }
1283
1284
1285 int eap_peer_peap_register(void)
1286 {
1287 struct eap_method *eap;
1288
1289 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1290 EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP");
1291 if (eap == NULL)
1292 return -1;
1293
1294 eap->init = eap_peap_init;
1295 eap->deinit = eap_peap_deinit;
1296 eap->process = eap_peap_process;
1297 eap->isKeyAvailable = eap_peap_isKeyAvailable;
1298 eap->getKey = eap_peap_getKey;
1299 eap->get_status = eap_peap_get_status;
1300 eap->has_reauth_data = eap_peap_has_reauth_data;
1301 eap->deinit_for_reauth = eap_peap_deinit_for_reauth;
1302 eap->init_for_reauth = eap_peap_init_for_reauth;
1303 eap->getSessionId = eap_peap_get_session_id;
1304
1305 return eap_peer_method_register(eap);
1306 }
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