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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) 2004-2019, 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 + EAP_EMSK_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_clear_free(data->pending_phase2_req);
190 wpabuf_clear_free(data->pending_resp);
191 bin_clear_free(data, sizeof(*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, res;
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 res = peap_prfplus(data->peap_version, tk, 40,
296 "Inner Methods Compound Keys",
297 isk, sizeof(isk), imck, sizeof(imck));
298 forced_memzero(isk, sizeof(isk));
299 if (res < 0)
300 return -1;
301 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IMCK (IPMKj)",
302 imck, sizeof(imck));
303
304 os_memcpy(data->ipmk, imck, 40);
305 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK (S-IPMKj)", data->ipmk, 40);
306 os_memcpy(data->cmk, imck + 40, 20);
307 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK (CMKj)", data->cmk, 20);
308 forced_memzero(imck, sizeof(imck));
309
310 return 0;
311 }
312
313
314 static int eap_tlv_add_cryptobinding(struct eap_sm *sm,
315 struct eap_peap_data *data,
316 struct wpabuf *buf)
317 {
318 u8 *mac;
319 u8 eap_type = EAP_TYPE_PEAP;
320 const u8 *addr[2];
321 size_t len[2];
322 u16 tlv_type;
323
324 /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
325 addr[0] = wpabuf_put(buf, 0);
326 len[0] = 60;
327 addr[1] = &eap_type;
328 len[1] = 1;
329
330 tlv_type = EAP_TLV_CRYPTO_BINDING_TLV;
331 wpabuf_put_be16(buf, tlv_type);
332 wpabuf_put_be16(buf, 56);
333
334 wpabuf_put_u8(buf, 0); /* Reserved */
335 wpabuf_put_u8(buf, data->peap_version); /* Version */
336 wpabuf_put_u8(buf, data->peap_version); /* RecvVersion */
337 wpabuf_put_u8(buf, 1); /* SubType: 0 = Request, 1 = Response */
338 wpabuf_put_data(buf, data->binding_nonce, 32); /* Nonce */
339 mac = wpabuf_put(buf, 20); /* Compound_MAC */
340 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC CMK", data->cmk, 20);
341 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 1",
342 addr[0], len[0]);
343 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 2",
344 addr[1], len[1]);
345 if (hmac_sha1_vector(data->cmk, 20, 2, addr, len, mac) < 0)
346 return -1;
347 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC", mac, SHA1_MAC_LEN);
348 data->crypto_binding_used = 1;
349
350 return 0;
351 }
352
353
354 /**
355 * eap_tlv_build_result - Build EAP-TLV Result message
356 * @id: EAP identifier for the header
357 * @status: Status (EAP_TLV_RESULT_SUCCESS or EAP_TLV_RESULT_FAILURE)
358 * Returns: Buffer to the allocated EAP-TLV Result message or %NULL on failure
359 *
360 * This function builds an EAP-TLV Result message. The caller is responsible
361 * for freeing the returned buffer.
362 */
363 static struct wpabuf * eap_tlv_build_result(struct eap_sm *sm,
364 struct eap_peap_data *data,
365 int crypto_tlv_used,
366 int id, u16 status)
367 {
368 struct wpabuf *msg;
369 size_t len;
370
371 if (data->crypto_binding == NO_BINDING)
372 crypto_tlv_used = 0;
373
374 len = 6;
375 if (crypto_tlv_used)
376 len += 60; /* Cryptobinding TLV */
377 msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, len,
378 EAP_CODE_RESPONSE, id);
379 if (msg == NULL)
380 return NULL;
381
382 wpabuf_put_u8(msg, 0x80); /* Mandatory */
383 wpabuf_put_u8(msg, EAP_TLV_RESULT_TLV);
384 wpabuf_put_be16(msg, 2); /* Length */
385 wpabuf_put_be16(msg, status); /* Status */
386
387 if (crypto_tlv_used && eap_tlv_add_cryptobinding(sm, data, msg)) {
388 wpabuf_clear_free(msg);
389 return NULL;
390 }
391
392 return msg;
393 }
394
395
396 static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
397 struct eap_peap_data *data,
398 const u8 *crypto_tlv,
399 size_t crypto_tlv_len)
400 {
401 u8 buf[61], mac[SHA1_MAC_LEN];
402 const u8 *pos;
403
404 if (eap_peap_derive_cmk(sm, data) < 0) {
405 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not derive CMK");
406 return -1;
407 }
408
409 if (crypto_tlv_len != 4 + 56) {
410 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid cryptobinding TLV "
411 "length %d", (int) crypto_tlv_len);
412 return -1;
413 }
414
415 pos = crypto_tlv;
416 pos += 4; /* TLV header */
417 if (pos[1] != data->peap_version) {
418 wpa_printf(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV Version "
419 "mismatch (was %d; expected %d)",
420 pos[1], data->peap_version);
421 return -1;
422 }
423
424 if (pos[3] != 0) {
425 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV "
426 "SubType %d", pos[3]);
427 return -1;
428 }
429 pos += 4;
430 os_memcpy(data->binding_nonce, pos, 32);
431 pos += 32; /* Nonce */
432
433 /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
434 os_memcpy(buf, crypto_tlv, 60);
435 os_memset(buf + 4 + 4 + 32, 0, 20); /* Compound_MAC */
436 buf[60] = EAP_TYPE_PEAP;
437 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Compound_MAC data",
438 buf, sizeof(buf));
439 hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);
440
441 if (os_memcmp_const(mac, pos, SHA1_MAC_LEN) != 0) {
442 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
443 "cryptobinding TLV");
444 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received MAC",
445 pos, SHA1_MAC_LEN);
446 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Expected MAC",
447 mac, SHA1_MAC_LEN);
448 return -1;
449 }
450
451 wpa_printf(MSG_DEBUG, "EAP-PEAP: Valid cryptobinding TLV received");
452
453 return 0;
454 }
455
456
457 /**
458 * eap_tlv_process - Process a received EAP-TLV message and generate a response
459 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
460 * @ret: Return values from EAP request validation and processing
461 * @req: EAP-TLV request to be processed. The caller must have validated that
462 * the buffer is large enough to contain full request (hdr->length bytes) and
463 * that the EAP type is EAP_TYPE_TLV.
464 * @resp: Buffer to return a pointer to the allocated response message. This
465 * field should be initialized to %NULL before the call. The value will be
466 * updated if a response message is generated. The caller is responsible for
467 * freeing the allocated message.
468 * @force_failure: Force negotiation to fail
469 * Returns: 0 on success, -1 on failure
470 */
471 static int eap_tlv_process(struct eap_sm *sm, struct eap_peap_data *data,
472 struct eap_method_ret *ret,
473 const struct wpabuf *req, struct wpabuf **resp,
474 int force_failure)
475 {
476 size_t left, tlv_len;
477 const u8 *pos;
478 const u8 *result_tlv = NULL, *crypto_tlv = NULL;
479 size_t result_tlv_len = 0, crypto_tlv_len = 0;
480 int tlv_type, mandatory;
481
482 /* Parse TLVs */
483 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, req, &left);
484 if (pos == NULL)
485 return -1;
486 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Received TLVs", pos, left);
487 while (left >= 4) {
488 mandatory = !!(pos[0] & 0x80);
489 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
490 pos += 2;
491 tlv_len = WPA_GET_BE16(pos);
492 pos += 2;
493 left -= 4;
494 if (tlv_len > left) {
495 wpa_printf(MSG_DEBUG, "EAP-TLV: TLV underrun "
496 "(tlv_len=%lu left=%lu)",
497 (unsigned long) tlv_len,
498 (unsigned long) left);
499 return -1;
500 }
501 switch (tlv_type) {
502 case EAP_TLV_RESULT_TLV:
503 result_tlv = pos;
504 result_tlv_len = tlv_len;
505 break;
506 case EAP_TLV_CRYPTO_BINDING_TLV:
507 crypto_tlv = pos;
508 crypto_tlv_len = tlv_len;
509 break;
510 default:
511 wpa_printf(MSG_DEBUG, "EAP-TLV: Unsupported TLV Type "
512 "%d%s", tlv_type,
513 mandatory ? " (mandatory)" : "");
514 if (mandatory) {
515 /* NAK TLV and ignore all TLVs in this packet.
516 */
517 *resp = eap_tlv_build_nak(eap_get_id(req),
518 tlv_type);
519 return *resp == NULL ? -1 : 0;
520 }
521 /* Ignore this TLV, but process other TLVs */
522 break;
523 }
524
525 pos += tlv_len;
526 left -= tlv_len;
527 }
528 if (left) {
529 wpa_printf(MSG_DEBUG, "EAP-TLV: Last TLV too short in "
530 "Request (left=%lu)", (unsigned long) left);
531 return -1;
532 }
533
534 /* Process supported TLVs */
535 if (crypto_tlv && data->crypto_binding != NO_BINDING) {
536 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV",
537 crypto_tlv, crypto_tlv_len);
538 if (eap_tlv_validate_cryptobinding(sm, data, crypto_tlv - 4,
539 crypto_tlv_len + 4) < 0) {
540 if (result_tlv == NULL)
541 return -1;
542 force_failure = 1;
543 crypto_tlv = NULL; /* do not include Cryptobinding TLV
544 * in response, if the received
545 * cryptobinding was invalid. */
546 }
547 } else if (!crypto_tlv && data->crypto_binding == REQUIRE_BINDING) {
548 wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV");
549 return -1;
550 }
551
552 if (result_tlv) {
553 int status, resp_status;
554 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Result TLV",
555 result_tlv, result_tlv_len);
556 if (result_tlv_len < 2) {
557 wpa_printf(MSG_INFO, "EAP-TLV: Too short Result TLV "
558 "(len=%lu)",
559 (unsigned long) result_tlv_len);
560 return -1;
561 }
562 status = WPA_GET_BE16(result_tlv);
563 if (status == EAP_TLV_RESULT_SUCCESS) {
564 wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Success "
565 "- EAP-TLV/Phase2 Completed");
566 if (force_failure) {
567 wpa_printf(MSG_INFO, "EAP-TLV: Earlier failure"
568 " - force failed Phase 2");
569 resp_status = EAP_TLV_RESULT_FAILURE;
570 ret->decision = DECISION_FAIL;
571 } else {
572 resp_status = EAP_TLV_RESULT_SUCCESS;
573 ret->decision = DECISION_UNCOND_SUCC;
574 }
575 } else if (status == EAP_TLV_RESULT_FAILURE) {
576 wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Failure");
577 resp_status = EAP_TLV_RESULT_FAILURE;
578 ret->decision = DECISION_FAIL;
579 } else {
580 wpa_printf(MSG_INFO, "EAP-TLV: Unknown TLV Result "
581 "Status %d", status);
582 resp_status = EAP_TLV_RESULT_FAILURE;
583 ret->decision = DECISION_FAIL;
584 }
585 ret->methodState = METHOD_DONE;
586
587 *resp = eap_tlv_build_result(sm, data, crypto_tlv != NULL,
588 eap_get_id(req), resp_status);
589 }
590
591 return 0;
592 }
593
594
595 static int eap_peap_phase2_request(struct eap_sm *sm,
596 struct eap_peap_data *data,
597 struct eap_method_ret *ret,
598 struct wpabuf *req,
599 struct wpabuf **resp)
600 {
601 struct eap_hdr *hdr = wpabuf_mhead(req);
602 size_t len = be_to_host16(hdr->length);
603 u8 *pos;
604 struct eap_method_ret iret;
605 struct eap_peer_config *config = eap_get_config(sm);
606
607 if (len <= sizeof(struct eap_hdr)) {
608 wpa_printf(MSG_INFO, "EAP-PEAP: too short "
609 "Phase 2 request (len=%lu)", (unsigned long) len);
610 return -1;
611 }
612 pos = (u8 *) (hdr + 1);
613 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Request: type=%d", *pos);
614 switch (*pos) {
615 case EAP_TYPE_IDENTITY:
616 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
617 break;
618 case EAP_TYPE_TLV:
619 os_memset(&iret, 0, sizeof(iret));
620 if (eap_tlv_process(sm, data, &iret, req, resp,
621 data->phase2_eap_started &&
622 !data->phase2_eap_success)) {
623 ret->methodState = METHOD_DONE;
624 ret->decision = DECISION_FAIL;
625 return -1;
626 }
627 if (iret.methodState == METHOD_DONE ||
628 iret.methodState == METHOD_MAY_CONT) {
629 ret->methodState = iret.methodState;
630 ret->decision = iret.decision;
631 data->phase2_success = 1;
632 }
633 break;
634 case EAP_TYPE_EXPANDED:
635 #ifdef EAP_TNC
636 if (data->soh) {
637 const u8 *epos;
638 size_t eleft;
639
640 epos = eap_hdr_validate(EAP_VENDOR_MICROSOFT, 0x21,
641 req, &eleft);
642 if (epos) {
643 struct wpabuf *buf;
644 wpa_printf(MSG_DEBUG,
645 "EAP-PEAP: SoH EAP Extensions");
646 buf = tncc_process_soh_request(data->soh,
647 epos, eleft);
648 if (buf) {
649 *resp = eap_msg_alloc(
650 EAP_VENDOR_MICROSOFT, 0x21,
651 wpabuf_len(buf),
652 EAP_CODE_RESPONSE,
653 hdr->identifier);
654 if (*resp == NULL) {
655 ret->methodState = METHOD_DONE;
656 ret->decision = DECISION_FAIL;
657 wpabuf_clear_free(buf);
658 return -1;
659 }
660 wpabuf_put_buf(*resp, buf);
661 wpabuf_clear_free(buf);
662 break;
663 }
664 }
665 }
666 #endif /* EAP_TNC */
667 /* fall through */
668 default:
669 if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
670 data->phase2_type.method == EAP_TYPE_NONE) {
671 size_t i;
672 for (i = 0; i < data->num_phase2_types; i++) {
673 if (data->phase2_types[i].vendor !=
674 EAP_VENDOR_IETF ||
675 data->phase2_types[i].method != *pos)
676 continue;
677
678 data->phase2_type.vendor =
679 data->phase2_types[i].vendor;
680 data->phase2_type.method =
681 data->phase2_types[i].method;
682 wpa_printf(MSG_DEBUG, "EAP-PEAP: Selected "
683 "Phase 2 EAP vendor %d method %d",
684 data->phase2_type.vendor,
685 data->phase2_type.method);
686 break;
687 }
688 }
689 if (*pos != data->phase2_type.method ||
690 *pos == EAP_TYPE_NONE) {
691 if (eap_peer_tls_phase2_nak(data->phase2_types,
692 data->num_phase2_types,
693 hdr, resp))
694 return -1;
695 return 0;
696 }
697
698 if (data->phase2_priv == NULL) {
699 data->phase2_method = eap_peer_get_eap_method(
700 data->phase2_type.vendor,
701 data->phase2_type.method);
702 if (data->phase2_method) {
703 sm->init_phase2 = 1;
704 data->phase2_priv =
705 data->phase2_method->init(sm);
706 sm->init_phase2 = 0;
707 }
708 }
709 if (data->phase2_priv == NULL || data->phase2_method == NULL) {
710 wpa_printf(MSG_INFO, "EAP-PEAP: failed to initialize "
711 "Phase 2 EAP method %d", *pos);
712 ret->methodState = METHOD_DONE;
713 ret->decision = DECISION_FAIL;
714 return -1;
715 }
716 data->phase2_eap_started = 1;
717 os_memset(&iret, 0, sizeof(iret));
718 *resp = data->phase2_method->process(sm, data->phase2_priv,
719 &iret, req);
720 if ((iret.methodState == METHOD_DONE ||
721 iret.methodState == METHOD_MAY_CONT) &&
722 (iret.decision == DECISION_UNCOND_SUCC ||
723 iret.decision == DECISION_COND_SUCC)) {
724 data->phase2_eap_success = 1;
725 data->phase2_success = 1;
726 }
727 break;
728 }
729
730 if (*resp == NULL &&
731 (config->pending_req_identity || config->pending_req_password ||
732 config->pending_req_otp || config->pending_req_new_password ||
733 config->pending_req_sim)) {
734 wpabuf_clear_free(data->pending_phase2_req);
735 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
736 }
737
738 return 0;
739 }
740
741
742 static int eap_peap_decrypt(struct eap_sm *sm, struct eap_peap_data *data,
743 struct eap_method_ret *ret,
744 const struct eap_hdr *req,
745 const struct wpabuf *in_data,
746 struct wpabuf **out_data)
747 {
748 struct wpabuf *in_decrypted = NULL;
749 int res, skip_change = 0;
750 struct eap_hdr *hdr, *rhdr;
751 struct wpabuf *resp = NULL;
752 size_t len;
753
754 wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
755 " Phase 2", (unsigned long) wpabuf_len(in_data));
756
757 if (data->pending_phase2_req) {
758 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 request - "
759 "skip decryption and use old data");
760 /* Clear TLS reassembly state. */
761 eap_peer_tls_reset_input(&data->ssl);
762 in_decrypted = data->pending_phase2_req;
763 data->pending_phase2_req = NULL;
764 skip_change = 1;
765 goto continue_req;
766 }
767
768 if (wpabuf_len(in_data) == 0 && sm->workaround &&
769 data->phase2_success) {
770 /*
771 * Cisco ACS seems to be using TLS ACK to terminate
772 * EAP-PEAPv0/GTC. Try to reply with TLS ACK.
773 */
774 wpa_printf(MSG_DEBUG, "EAP-PEAP: Received TLS ACK, but "
775 "expected data - acknowledge with TLS ACK since "
776 "Phase 2 has been completed");
777 ret->decision = DECISION_COND_SUCC;
778 ret->methodState = METHOD_DONE;
779 return 1;
780 } else if (wpabuf_len(in_data) == 0) {
781 /* Received TLS ACK - requesting more fragments */
782 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
783 data->peap_version,
784 req->identifier, NULL, out_data);
785 }
786
787 res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
788 if (res)
789 return res;
790
791 continue_req:
792 wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP",
793 in_decrypted);
794
795 hdr = wpabuf_mhead(in_decrypted);
796 if (wpabuf_len(in_decrypted) == 5 && hdr->code == EAP_CODE_REQUEST &&
797 be_to_host16(hdr->length) == 5 &&
798 eap_get_type(in_decrypted) == EAP_TYPE_IDENTITY) {
799 /* At least FreeRADIUS seems to send full EAP header with
800 * EAP Request Identity */
801 skip_change = 1;
802 }
803 if (wpabuf_len(in_decrypted) >= 5 && hdr->code == EAP_CODE_REQUEST &&
804 eap_get_type(in_decrypted) == EAP_TYPE_TLV) {
805 skip_change = 1;
806 }
807
808 if (data->peap_version == 0 && !skip_change) {
809 struct eap_hdr *nhdr;
810 struct wpabuf *nmsg = wpabuf_alloc(sizeof(struct eap_hdr) +
811 wpabuf_len(in_decrypted));
812 if (nmsg == NULL) {
813 wpabuf_clear_free(in_decrypted);
814 return 0;
815 }
816 nhdr = wpabuf_put(nmsg, sizeof(*nhdr));
817 wpabuf_put_buf(nmsg, in_decrypted);
818 nhdr->code = req->code;
819 nhdr->identifier = req->identifier;
820 nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
821 wpabuf_len(in_decrypted));
822
823 wpabuf_clear_free(in_decrypted);
824 in_decrypted = nmsg;
825 }
826
827 hdr = wpabuf_mhead(in_decrypted);
828 if (wpabuf_len(in_decrypted) < sizeof(*hdr)) {
829 wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
830 "EAP frame (len=%lu)",
831 (unsigned long) wpabuf_len(in_decrypted));
832 wpabuf_clear_free(in_decrypted);
833 return 0;
834 }
835 len = be_to_host16(hdr->length);
836 if (len > wpabuf_len(in_decrypted)) {
837 wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in "
838 "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
839 (unsigned long) wpabuf_len(in_decrypted),
840 (unsigned long) len);
841 wpabuf_clear_free(in_decrypted);
842 return 0;
843 }
844 if (len < wpabuf_len(in_decrypted)) {
845 wpa_printf(MSG_INFO, "EAP-PEAP: Odd.. Phase 2 EAP header has "
846 "shorter length than full decrypted data "
847 "(%lu < %lu)",
848 (unsigned long) len,
849 (unsigned long) wpabuf_len(in_decrypted));
850 }
851 wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d "
852 "identifier=%d length=%lu", hdr->code, hdr->identifier,
853 (unsigned long) len);
854 switch (hdr->code) {
855 case EAP_CODE_REQUEST:
856 if (eap_peap_phase2_request(sm, data, ret, in_decrypted,
857 &resp)) {
858 wpabuf_clear_free(in_decrypted);
859 wpa_printf(MSG_INFO, "EAP-PEAP: Phase2 Request "
860 "processing failed");
861 return 0;
862 }
863 break;
864 case EAP_CODE_SUCCESS:
865 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success");
866 if (data->peap_version == 1) {
867 /* EAP-Success within TLS tunnel is used to indicate
868 * shutdown of the TLS channel. The authentication has
869 * been completed. */
870 if (data->phase2_eap_started &&
871 !data->phase2_eap_success) {
872 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 "
873 "Success used to indicate success, "
874 "but Phase 2 EAP was not yet "
875 "completed successfully");
876 ret->methodState = METHOD_DONE;
877 ret->decision = DECISION_FAIL;
878 wpabuf_clear_free(in_decrypted);
879 return 0;
880 }
881 wpa_printf(MSG_DEBUG, "EAP-PEAP: Version 1 - "
882 "EAP-Success within TLS tunnel - "
883 "authentication completed");
884 ret->decision = DECISION_UNCOND_SUCC;
885 ret->methodState = METHOD_DONE;
886 data->phase2_success = 1;
887 if (data->peap_outer_success == 2) {
888 wpabuf_clear_free(in_decrypted);
889 wpa_printf(MSG_DEBUG, "EAP-PEAP: Use TLS ACK "
890 "to finish authentication");
891 return 1;
892 } else if (data->peap_outer_success == 1) {
893 /* Reply with EAP-Success within the TLS
894 * channel to complete the authentication. */
895 resp = wpabuf_alloc(sizeof(struct eap_hdr));
896 if (resp) {
897 rhdr = wpabuf_put(resp, sizeof(*rhdr));
898 rhdr->code = EAP_CODE_SUCCESS;
899 rhdr->identifier = hdr->identifier;
900 rhdr->length =
901 host_to_be16(sizeof(*rhdr));
902 }
903 } else {
904 /* No EAP-Success expected for Phase 1 (outer,
905 * unencrypted auth), so force EAP state
906 * machine to SUCCESS state. */
907 sm->peap_done = TRUE;
908 }
909 } else {
910 /* FIX: ? */
911 }
912 break;
913 case EAP_CODE_FAILURE:
914 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure");
915 ret->decision = DECISION_FAIL;
916 ret->methodState = METHOD_MAY_CONT;
917 ret->allowNotifications = FALSE;
918 /* Reply with EAP-Failure within the TLS channel to complete
919 * failure reporting. */
920 resp = wpabuf_alloc(sizeof(struct eap_hdr));
921 if (resp) {
922 rhdr = wpabuf_put(resp, sizeof(*rhdr));
923 rhdr->code = EAP_CODE_FAILURE;
924 rhdr->identifier = hdr->identifier;
925 rhdr->length = host_to_be16(sizeof(*rhdr));
926 }
927 break;
928 default:
929 wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
930 "Phase 2 EAP header", hdr->code);
931 break;
932 }
933
934 wpabuf_clear_free(in_decrypted);
935
936 if (resp) {
937 int skip_change2 = 0;
938 struct wpabuf *rmsg, buf;
939
940 wpa_hexdump_buf_key(MSG_DEBUG,
941 "EAP-PEAP: Encrypting Phase 2 data", resp);
942 /* PEAP version changes */
943 if (wpabuf_len(resp) >= 5 &&
944 wpabuf_head_u8(resp)[0] == EAP_CODE_RESPONSE &&
945 eap_get_type(resp) == EAP_TYPE_TLV)
946 skip_change2 = 1;
947 rmsg = resp;
948 if (data->peap_version == 0 && !skip_change2) {
949 wpabuf_set(&buf, wpabuf_head_u8(resp) +
950 sizeof(struct eap_hdr),
951 wpabuf_len(resp) - sizeof(struct eap_hdr));
952 rmsg = &buf;
953 }
954
955 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
956 data->peap_version, req->identifier,
957 rmsg, out_data)) {
958 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to encrypt "
959 "a Phase 2 frame");
960 }
961 wpabuf_clear_free(resp);
962 }
963
964 return 0;
965 }
966
967
968 static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv,
969 struct eap_method_ret *ret,
970 const struct wpabuf *reqData)
971 {
972 const struct eap_hdr *req;
973 size_t left;
974 int res;
975 u8 flags, id;
976 struct wpabuf *resp;
977 const u8 *pos;
978 struct eap_peap_data *data = priv;
979 struct wpabuf msg;
980
981 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_PEAP, ret,
982 reqData, &left, &flags);
983 if (pos == NULL)
984 return NULL;
985 req = wpabuf_head(reqData);
986 id = req->identifier;
987
988 if (flags & EAP_TLS_FLAGS_START) {
989 wpa_printf(MSG_DEBUG, "EAP-PEAP: Start (server ver=%d, own "
990 "ver=%d)", flags & EAP_TLS_VERSION_MASK,
991 data->peap_version);
992 if ((flags & EAP_TLS_VERSION_MASK) < data->peap_version)
993 data->peap_version = flags & EAP_TLS_VERSION_MASK;
994 if (data->force_peap_version >= 0 &&
995 data->force_peap_version != data->peap_version) {
996 wpa_printf(MSG_WARNING, "EAP-PEAP: Failed to select "
997 "forced PEAP version %d",
998 data->force_peap_version);
999 ret->methodState = METHOD_DONE;
1000 ret->decision = DECISION_FAIL;
1001 ret->allowNotifications = FALSE;
1002 return NULL;
1003 }
1004 wpa_printf(MSG_DEBUG, "EAP-PEAP: Using PEAP version %d",
1005 data->peap_version);
1006 left = 0; /* make sure that this frame is empty, even though it
1007 * should always be, anyway */
1008 }
1009
1010 wpabuf_set(&msg, pos, left);
1011
1012 resp = NULL;
1013 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1014 !data->resuming) {
1015 res = eap_peap_decrypt(sm, data, ret, req, &msg, &resp);
1016 } else {
1017 if (sm->waiting_ext_cert_check && data->pending_resp) {
1018 struct eap_peer_config *config = eap_get_config(sm);
1019
1020 if (config->pending_ext_cert_check ==
1021 EXT_CERT_CHECK_GOOD) {
1022 wpa_printf(MSG_DEBUG,
1023 "EAP-PEAP: External certificate check succeeded - continue handshake");
1024 resp = data->pending_resp;
1025 data->pending_resp = NULL;
1026 sm->waiting_ext_cert_check = 0;
1027 return resp;
1028 }
1029
1030 if (config->pending_ext_cert_check ==
1031 EXT_CERT_CHECK_BAD) {
1032 wpa_printf(MSG_DEBUG,
1033 "EAP-PEAP: External certificate check failed - force authentication failure");
1034 ret->methodState = METHOD_DONE;
1035 ret->decision = DECISION_FAIL;
1036 sm->waiting_ext_cert_check = 0;
1037 return NULL;
1038 }
1039
1040 wpa_printf(MSG_DEBUG,
1041 "EAP-PEAP: Continuing to wait external server certificate validation");
1042 return NULL;
1043 }
1044
1045 res = eap_peer_tls_process_helper(sm, &data->ssl,
1046 EAP_TYPE_PEAP,
1047 data->peap_version, id, &msg,
1048 &resp);
1049
1050 if (res < 0) {
1051 wpa_printf(MSG_DEBUG,
1052 "EAP-PEAP: TLS processing failed");
1053 ret->methodState = METHOD_DONE;
1054 ret->decision = DECISION_FAIL;
1055 return resp;
1056 }
1057
1058
1059 if (sm->waiting_ext_cert_check) {
1060 wpa_printf(MSG_DEBUG,
1061 "EAP-PEAP: Waiting external server certificate validation");
1062 wpabuf_clear_free(data->pending_resp);
1063 data->pending_resp = resp;
1064 return NULL;
1065 }
1066
1067 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1068 char *label;
1069 wpa_printf(MSG_DEBUG,
1070 "EAP-PEAP: TLS done, proceed to Phase 2");
1071 eap_peap_free_key(data);
1072 /* draft-josefsson-ppext-eap-tls-eap-05.txt
1073 * specifies that PEAPv1 would use "client PEAP
1074 * encryption" as the label. However, most existing
1075 * PEAPv1 implementations seem to be using the old
1076 * label, "client EAP encryption", instead. Use the old
1077 * label by default, but allow it to be configured with
1078 * phase1 parameter peaplabel=1. */
1079 if (data->force_new_label)
1080 label = "client PEAP encryption";
1081 else
1082 label = "client EAP encryption";
1083 wpa_printf(MSG_DEBUG, "EAP-PEAP: using label '%s' in "
1084 "key derivation", label);
1085 data->key_data =
1086 eap_peer_tls_derive_key(sm, &data->ssl, label,
1087 NULL, 0,
1088 EAP_TLS_KEY_LEN +
1089 EAP_EMSK_LEN);
1090 if (data->key_data) {
1091 wpa_hexdump_key(MSG_DEBUG,
1092 "EAP-PEAP: Derived key",
1093 data->key_data,
1094 EAP_TLS_KEY_LEN);
1095 wpa_hexdump_key(MSG_DEBUG,
1096 "EAP-PEAP: Derived EMSK",
1097 data->key_data +
1098 EAP_TLS_KEY_LEN,
1099 EAP_EMSK_LEN);
1100 } else {
1101 wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to "
1102 "derive key");
1103 }
1104
1105 os_free(data->session_id);
1106 data->session_id =
1107 eap_peer_tls_derive_session_id(sm, &data->ssl,
1108 EAP_TYPE_PEAP,
1109 &data->id_len);
1110 if (data->session_id) {
1111 wpa_hexdump(MSG_DEBUG,
1112 "EAP-PEAP: Derived Session-Id",
1113 data->session_id, data->id_len);
1114 } else {
1115 wpa_printf(MSG_ERROR, "EAP-PEAP: Failed to "
1116 "derive Session-Id");
1117 }
1118
1119 if (sm->workaround && data->resuming) {
1120 /*
1121 * At least few RADIUS servers (Aegis v1.1.6;
1122 * but not v1.1.4; and Cisco ACS) seem to be
1123 * terminating PEAPv1 (Aegis) or PEAPv0 (Cisco
1124 * ACS) session resumption with outer
1125 * EAP-Success. This does not seem to follow
1126 * draft-josefsson-pppext-eap-tls-eap-05.txt
1127 * section 4.2, so only allow this if EAP
1128 * workarounds are enabled.
1129 */
1130 wpa_printf(MSG_DEBUG, "EAP-PEAP: Workaround - "
1131 "allow outer EAP-Success to "
1132 "terminate PEAP resumption");
1133 ret->decision = DECISION_COND_SUCC;
1134 data->phase2_success = 1;
1135 }
1136
1137 data->resuming = 0;
1138 }
1139
1140 if (res == 2) {
1141 /*
1142 * Application data included in the handshake message.
1143 */
1144 wpabuf_clear_free(data->pending_phase2_req);
1145 data->pending_phase2_req = resp;
1146 resp = NULL;
1147 res = eap_peap_decrypt(sm, data, ret, req, &msg,
1148 &resp);
1149 }
1150 }
1151
1152 if (ret->methodState == METHOD_DONE) {
1153 ret->allowNotifications = FALSE;
1154 }
1155
1156 if (res == 1) {
1157 wpabuf_clear_free(resp);
1158 return eap_peer_tls_build_ack(id, EAP_TYPE_PEAP,
1159 data->peap_version);
1160 }
1161
1162 return resp;
1163 }
1164
1165
1166 static Boolean eap_peap_has_reauth_data(struct eap_sm *sm, void *priv)
1167 {
1168 struct eap_peap_data *data = priv;
1169 return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1170 data->phase2_success;
1171 }
1172
1173
1174 static void eap_peap_deinit_for_reauth(struct eap_sm *sm, void *priv)
1175 {
1176 struct eap_peap_data *data = priv;
1177
1178 if (data->phase2_priv && data->phase2_method &&
1179 data->phase2_method->deinit_for_reauth)
1180 data->phase2_method->deinit_for_reauth(sm, data->phase2_priv);
1181 wpabuf_clear_free(data->pending_phase2_req);
1182 data->pending_phase2_req = NULL;
1183 wpabuf_clear_free(data->pending_resp);
1184 data->pending_resp = NULL;
1185 data->crypto_binding_used = 0;
1186 }
1187
1188
1189 static void * eap_peap_init_for_reauth(struct eap_sm *sm, void *priv)
1190 {
1191 struct eap_peap_data *data = priv;
1192 eap_peap_free_key(data);
1193 os_free(data->session_id);
1194 data->session_id = NULL;
1195 if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1196 os_free(data);
1197 return NULL;
1198 }
1199 if (data->phase2_priv && data->phase2_method &&
1200 data->phase2_method->init_for_reauth)
1201 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1202 data->phase2_success = 0;
1203 data->phase2_eap_success = 0;
1204 data->phase2_eap_started = 0;
1205 data->resuming = 1;
1206 data->reauth = 1;
1207 sm->peap_done = FALSE;
1208 return priv;
1209 }
1210
1211
1212 static int eap_peap_get_status(struct eap_sm *sm, void *priv, char *buf,
1213 size_t buflen, int verbose)
1214 {
1215 struct eap_peap_data *data = priv;
1216 int len, ret;
1217
1218 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1219 if (data->phase2_method) {
1220 ret = os_snprintf(buf + len, buflen - len,
1221 "EAP-PEAPv%d Phase2 method=%s\n",
1222 data->peap_version,
1223 data->phase2_method->name);
1224 if (os_snprintf_error(buflen - len, ret))
1225 return len;
1226 len += ret;
1227 }
1228 return len;
1229 }
1230
1231
1232 static Boolean eap_peap_isKeyAvailable(struct eap_sm *sm, void *priv)
1233 {
1234 struct eap_peap_data *data = priv;
1235 return data->key_data != NULL && data->phase2_success;
1236 }
1237
1238
1239 static u8 * eap_peap_getKey(struct eap_sm *sm, void *priv, size_t *len)
1240 {
1241 struct eap_peap_data *data = priv;
1242 u8 *key;
1243
1244 if (data->key_data == NULL || !data->phase2_success)
1245 return NULL;
1246
1247 key = os_malloc(EAP_TLS_KEY_LEN);
1248 if (key == NULL)
1249 return NULL;
1250
1251 *len = EAP_TLS_KEY_LEN;
1252
1253 if (data->crypto_binding_used) {
1254 u8 csk[128];
1255 /*
1256 * Note: It looks like Microsoft implementation requires null
1257 * termination for this label while the one used for deriving
1258 * IPMK|CMK did not use null termination.
1259 */
1260 if (peap_prfplus(data->peap_version, data->ipmk, 40,
1261 "Session Key Generating Function",
1262 (u8 *) "\00", 1, csk, sizeof(csk)) < 0) {
1263 os_free(key);
1264 return NULL;
1265 }
1266 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk));
1267 os_memcpy(key, csk, EAP_TLS_KEY_LEN);
1268 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
1269 key, EAP_TLS_KEY_LEN);
1270 forced_memzero(csk, sizeof(csk));
1271 } else
1272 os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
1273
1274 return key;
1275 }
1276
1277
1278 static u8 * eap_peap_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1279 {
1280 struct eap_peap_data *data = priv;
1281 u8 *key;
1282
1283 if (!data->key_data || !data->phase2_success)
1284 return NULL;
1285
1286 if (data->crypto_binding_used) {
1287 /* [MS-PEAP] does not define EMSK derivation */
1288 return NULL;
1289 }
1290
1291 key = os_memdup(data->key_data + EAP_TLS_KEY_LEN, EAP_EMSK_LEN);
1292 if (!key)
1293 return NULL;
1294
1295 *len = EAP_EMSK_LEN;
1296
1297 return key;
1298 }
1299
1300
1301 static u8 * eap_peap_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1302 {
1303 struct eap_peap_data *data = priv;
1304 u8 *id;
1305
1306 if (data->session_id == NULL || !data->phase2_success)
1307 return NULL;
1308
1309 id = os_memdup(data->session_id, data->id_len);
1310 if (id == NULL)
1311 return NULL;
1312
1313 *len = data->id_len;
1314
1315 return id;
1316 }
1317
1318
1319 int eap_peer_peap_register(void)
1320 {
1321 struct eap_method *eap;
1322
1323 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1324 EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP");
1325 if (eap == NULL)
1326 return -1;
1327
1328 eap->init = eap_peap_init;
1329 eap->deinit = eap_peap_deinit;
1330 eap->process = eap_peap_process;
1331 eap->isKeyAvailable = eap_peap_isKeyAvailable;
1332 eap->getKey = eap_peap_getKey;
1333 eap->get_emsk = eap_peap_get_emsk;
1334 eap->get_status = eap_peap_get_status;
1335 eap->has_reauth_data = eap_peap_has_reauth_data;
1336 eap->deinit_for_reauth = eap_peap_deinit_for_reauth;
1337 eap->init_for_reauth = eap_peap_init_for_reauth;
1338 eap->getSessionId = eap_peap_get_session_id;
1339
1340 return eap_peer_method_register(eap);
1341 }
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