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Expand PMF_FN_* macros.
[netbsd-mini2440.git] / dist / wpa / src / eap_server / eap_peap.c
blob5007d87e995ea13b63084d366da3eba6943e6ea8
1 /*
2 * hostapd / EAP-PEAP (draft-josefsson-pppext-eap-tls-eap-10.txt)
3 * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Alternatively, this software may be distributed under the terms of BSD
10 * license.
11 *
12 * See README and COPYING for more details.
13 */
14
15 #include "includes.h"
16
17 #include "common.h"
18 #include "sha1.h"
19 #include "eap_i.h"
20 #include "eap_tls_common.h"
21 #include "eap_common/eap_tlv_common.h"
22 #include "eap_common/eap_peap_common.h"
23 #include "tls.h"
24 #include "tncs.h"
25
26
27 /* Maximum supported PEAP version
28 * 0 = Microsoft's PEAP version 0; draft-kamath-pppext-peapv0-00.txt
29 * 1 = draft-josefsson-ppext-eap-tls-eap-05.txt
30 * 2 = draft-josefsson-ppext-eap-tls-eap-10.txt
31 */
32 #define EAP_PEAP_VERSION 1
33
34
35 static void eap_peap_reset(struct eap_sm *sm, void *priv);
36
37
38 struct eap_peap_data {
39 struct eap_ssl_data ssl;
40 enum {
41 START, PHASE1, PHASE1_ID2, PHASE2_START, PHASE2_ID,
42 PHASE2_METHOD, PHASE2_SOH,
43 PHASE2_TLV, SUCCESS_REQ, FAILURE_REQ, SUCCESS, FAILURE
44 } state;
45
46 int peap_version;
47 int recv_version;
48 const struct eap_method *phase2_method;
49 void *phase2_priv;
50 int force_version;
51 struct wpabuf *pending_phase2_resp;
52 enum { TLV_REQ_NONE, TLV_REQ_SUCCESS, TLV_REQ_FAILURE } tlv_request;
53 int crypto_binding_sent;
54 int crypto_binding_used;
55 enum { NO_BINDING, OPTIONAL_BINDING, REQUIRE_BINDING } crypto_binding;
56 u8 binding_nonce[32];
57 u8 ipmk[40];
58 u8 cmk[20];
59 u8 *phase2_key;
60 size_t phase2_key_len;
61 struct wpabuf *soh_response;
62 };
63
64
65 static const char * eap_peap_state_txt(int state)
66 {
67 switch (state) {
68 case START:
69 return "START";
70 case PHASE1:
71 return "PHASE1";
72 case PHASE1_ID2:
73 return "PHASE1_ID2";
74 case PHASE2_START:
75 return "PHASE2_START";
76 case PHASE2_ID:
77 return "PHASE2_ID";
78 case PHASE2_METHOD:
79 return "PHASE2_METHOD";
80 case PHASE2_SOH:
81 return "PHASE2_SOH";
82 case PHASE2_TLV:
83 return "PHASE2_TLV";
84 case SUCCESS_REQ:
85 return "SUCCESS_REQ";
86 case FAILURE_REQ:
87 return "FAILURE_REQ";
88 case SUCCESS:
89 return "SUCCESS";
90 case FAILURE:
91 return "FAILURE";
92 default:
93 return "Unknown?!";
94 }
95 }
96
97
98 static void eap_peap_state(struct eap_peap_data *data, int state)
99 {
100 wpa_printf(MSG_DEBUG, "EAP-PEAP: %s -> %s",
101 eap_peap_state_txt(data->state),
102 eap_peap_state_txt(state));
103 data->state = state;
104 }
105
106
107 static struct wpabuf * eap_peapv2_tlv_eap_payload(struct wpabuf *buf)
108 {
109 struct wpabuf *e;
110 struct eap_tlv_hdr *tlv;
111
112 if (buf == NULL)
113 return NULL;
114
115 /* Encapsulate EAP packet in EAP-Payload TLV */
116 wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Add EAP-Payload TLV");
117 e = wpabuf_alloc(sizeof(*tlv) + wpabuf_len(buf));
118 if (e == NULL) {
119 wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Failed to allocate memory "
120 "for TLV encapsulation");
121 wpabuf_free(buf);
122 return NULL;
123 }
124 tlv = wpabuf_put(e, sizeof(*tlv));
125 tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
126 EAP_TLV_EAP_PAYLOAD_TLV);
127 tlv->length = host_to_be16(wpabuf_len(buf));
128 wpabuf_put_buf(e, buf);
129 wpabuf_free(buf);
130 return e;
131 }
132
133
134 static void eap_peap_req_success(struct eap_sm *sm,
135 struct eap_peap_data *data)
136 {
137 if (data->state == FAILURE || data->state == FAILURE_REQ) {
138 eap_peap_state(data, FAILURE);
139 return;
140 }
141
142 if (data->peap_version == 0) {
143 data->tlv_request = TLV_REQ_SUCCESS;
144 eap_peap_state(data, PHASE2_TLV);
145 } else {
146 eap_peap_state(data, SUCCESS_REQ);
147 }
148 }
149
150
151 static void eap_peap_req_failure(struct eap_sm *sm,
152 struct eap_peap_data *data)
153 {
154 if (data->state == FAILURE || data->state == FAILURE_REQ ||
155 data->state == SUCCESS_REQ || data->tlv_request != TLV_REQ_NONE) {
156 eap_peap_state(data, FAILURE);
157 return;
158 }
159
160 if (data->peap_version == 0) {
161 data->tlv_request = TLV_REQ_FAILURE;
162 eap_peap_state(data, PHASE2_TLV);
163 } else {
164 eap_peap_state(data, FAILURE_REQ);
165 }
166 }
167
168
169 static void * eap_peap_init(struct eap_sm *sm)
170 {
171 struct eap_peap_data *data;
172
173 data = os_zalloc(sizeof(*data));
174 if (data == NULL)
175 return NULL;
176 data->peap_version = EAP_PEAP_VERSION;
177 data->force_version = -1;
178 if (sm->user && sm->user->force_version >= 0) {
179 data->force_version = sm->user->force_version;
180 wpa_printf(MSG_DEBUG, "EAP-PEAP: forcing version %d",
181 data->force_version);
182 data->peap_version = data->force_version;
183 }
184 data->state = START;
185 data->crypto_binding = OPTIONAL_BINDING;
186
187 if (eap_server_tls_ssl_init(sm, &data->ssl, 0)) {
188 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to initialize SSL.");
189 eap_peap_reset(sm, data);
190 return NULL;
191 }
192
193 return data;
194 }
195
196
197 static void eap_peap_reset(struct eap_sm *sm, void *priv)
198 {
199 struct eap_peap_data *data = priv;
200 if (data == NULL)
201 return;
202 if (data->phase2_priv && data->phase2_method)
203 data->phase2_method->reset(sm, data->phase2_priv);
204 eap_server_tls_ssl_deinit(sm, &data->ssl);
205 wpabuf_free(data->pending_phase2_resp);
206 os_free(data->phase2_key);
207 wpabuf_free(data->soh_response);
208 os_free(data);
209 }
210
211
212 static struct wpabuf * eap_peap_build_start(struct eap_sm *sm,
213 struct eap_peap_data *data, u8 id)
214 {
215 struct wpabuf *req;
216
217 req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PEAP, 1,
218 EAP_CODE_REQUEST, id);
219 if (req == NULL) {
220 wpa_printf(MSG_ERROR, "EAP-PEAP: Failed to allocate memory for"
221 " request");
222 eap_peap_state(data, FAILURE);
223 return NULL;
224 }
225
226 wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->peap_version);
227
228 eap_peap_state(data, PHASE1);
229
230 return req;
231 }
232
233
234 static struct wpabuf * eap_peap_build_phase2_req(struct eap_sm *sm,
235 struct eap_peap_data *data,
236 u8 id)
237 {
238 struct wpabuf *buf, *encr_req;
239 const u8 *req;
240 size_t req_len;
241
242 if (data->phase2_method == NULL || data->phase2_priv == NULL) {
243 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 method not ready");
244 return NULL;
245 }
246 buf = data->phase2_method->buildReq(sm, data->phase2_priv, id);
247 if (data->peap_version >= 2 && buf)
248 buf = eap_peapv2_tlv_eap_payload(buf);
249 if (buf == NULL)
250 return NULL;
251
252 req = wpabuf_head(buf);
253 req_len = wpabuf_len(buf);
254 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 data",
255 req, req_len);
256
257 if (data->peap_version == 0 &&
258 data->phase2_method->method != EAP_TYPE_TLV) {
259 req += sizeof(struct eap_hdr);
260 req_len -= sizeof(struct eap_hdr);
261 }
262
263 encr_req = eap_server_tls_encrypt(sm, &data->ssl, req, req_len);
264 wpabuf_free(buf);
265
266 return encr_req;
267 }
268
269
270 #ifdef EAP_TNC
271 static struct wpabuf * eap_peap_build_phase2_soh(struct eap_sm *sm,
272 struct eap_peap_data *data,
273 u8 id)
274 {
275 struct wpabuf *buf1, *buf, *encr_req;
276 const u8 *req;
277 size_t req_len;
278
279 buf1 = tncs_build_soh_request();
280 if (buf1 == NULL)
281 return NULL;
282
283 buf = eap_msg_alloc(EAP_VENDOR_MICROSOFT, 0x21, wpabuf_len(buf1),
284 EAP_CODE_REQUEST, id);
285 if (buf == NULL) {
286 wpabuf_free(buf1);
287 return NULL;
288 }
289 wpabuf_put_buf(buf, buf1);
290 wpabuf_free(buf1);
291
292 req = wpabuf_head(buf);
293 req_len = wpabuf_len(buf);
294
295 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 SOH data",
296 req, req_len);
297
298 req += sizeof(struct eap_hdr);
299 req_len -= sizeof(struct eap_hdr);
300
301 encr_req = eap_server_tls_encrypt(sm, &data->ssl, req, req_len);
302 wpabuf_free(buf);
303
304 return encr_req;
305 }
306 #endif /* EAP_TNC */
307
308
309 static void eap_peap_get_isk(struct eap_peap_data *data,
310 u8 *isk, size_t isk_len)
311 {
312 size_t key_len;
313
314 os_memset(isk, 0, isk_len);
315 if (data->phase2_key == NULL)
316 return;
317
318 key_len = data->phase2_key_len;
319 if (key_len > isk_len)
320 key_len = isk_len;
321 os_memcpy(isk, data->phase2_key, key_len);
322 }
323
324
325 static int eap_peap_derive_cmk(struct eap_sm *sm, struct eap_peap_data *data)
326 {
327 u8 *tk;
328 u8 isk[32], imck[60];
329
330 /*
331 * Tunnel key (TK) is the first 60 octets of the key generated by
332 * phase 1 of PEAP (based on TLS).
333 */
334 tk = eap_server_tls_derive_key(sm, &data->ssl, "client EAP encryption",
335 EAP_TLS_KEY_LEN);
336 if (tk == NULL)
337 return -1;
338 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TK", tk, 60);
339
340 eap_peap_get_isk(data, isk, sizeof(isk));
341 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: ISK", isk, sizeof(isk));
342
343 /*
344 * IPMK Seed = "Inner Methods Compound Keys" | ISK
345 * TempKey = First 40 octets of TK
346 * IPMK|CMK = PRF+(TempKey, IPMK Seed, 60)
347 * (note: draft-josefsson-pppext-eap-tls-eap-10.txt includes a space
348 * in the end of the label just before ISK; is that just a typo?)
349 */
350 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TempKey", tk, 40);
351 peap_prfplus(data->peap_version, tk, 40, "Inner Methods Compound Keys",
352 isk, sizeof(isk), imck, sizeof(imck));
353 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IMCK (IPMKj)",
354 imck, sizeof(imck));
355
356 os_free(tk);
357
358 /* TODO: fast-connect: IPMK|CMK = TK */
359 os_memcpy(data->ipmk, imck, 40);
360 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK (S-IPMKj)", data->ipmk, 40);
361 os_memcpy(data->cmk, imck + 40, 20);
362 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK (CMKj)", data->cmk, 20);
363
364 return 0;
365 }
366
367
368 static struct wpabuf * eap_peap_build_phase2_tlv(struct eap_sm *sm,
369 struct eap_peap_data *data,
370 u8 id)
371 {
372 struct wpabuf *buf, *encr_req;
373 size_t len;
374
375 len = 6; /* Result TLV */
376 if (data->crypto_binding != NO_BINDING)
377 len += 60; /* Cryptobinding TLV */
378 #ifdef EAP_TNC
379 if (data->soh_response)
380 len += wpabuf_len(data->soh_response);
381 #endif /* EAP_TNC */
382
383 buf = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, len,
384 EAP_CODE_REQUEST, id);
385 if (buf == NULL)
386 return NULL;
387
388 wpabuf_put_u8(buf, 0x80); /* Mandatory */
389 wpabuf_put_u8(buf, EAP_TLV_RESULT_TLV);
390 /* Length */
391 wpabuf_put_be16(buf, 2);
392 /* Status */
393 wpabuf_put_be16(buf, data->tlv_request == TLV_REQ_SUCCESS ?
394 EAP_TLV_RESULT_SUCCESS : EAP_TLV_RESULT_FAILURE);
395
396 if (data->peap_version == 0 && data->tlv_request == TLV_REQ_SUCCESS &&
397 data->crypto_binding != NO_BINDING) {
398 u8 *mac;
399 u8 eap_type = EAP_TYPE_PEAP;
400 const u8 *addr[2];
401 size_t len[2];
402 u16 tlv_type;
403
404 #ifdef EAP_TNC
405 if (data->soh_response) {
406 wpa_printf(MSG_DEBUG, "EAP-PEAP: Adding MS-SOH "
407 "Response TLV");
408 wpabuf_put_buf(buf, data->soh_response);
409 wpabuf_free(data->soh_response);
410 data->soh_response = NULL;
411 }
412 #endif /* EAP_TNC */
413
414 if (eap_peap_derive_cmk(sm, data) < 0 ||
415 os_get_random(data->binding_nonce, 32)) {
416 wpabuf_free(buf);
417 return NULL;
418 }
419
420 /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
421 addr[0] = wpabuf_put(buf, 0);
422 len[0] = 60;
423 addr[1] = &eap_type;
424 len[1] = 1;
425
426 tlv_type = EAP_TLV_CRYPTO_BINDING_TLV;
427 if (data->peap_version >= 2)
428 tlv_type |= EAP_TLV_TYPE_MANDATORY;
429 wpabuf_put_be16(buf, tlv_type);
430 wpabuf_put_be16(buf, 56);
431
432 wpabuf_put_u8(buf, 0); /* Reserved */
433 wpabuf_put_u8(buf, data->peap_version); /* Version */
434 wpabuf_put_u8(buf, data->recv_version); /* RecvVersion */
435 wpabuf_put_u8(buf, 0); /* SubType: 0 = Request, 1 = Response */
436 wpabuf_put_data(buf, data->binding_nonce, 32); /* Nonce */
437 mac = wpabuf_put(buf, 20); /* Compound_MAC */
438 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC CMK",
439 data->cmk, 20);
440 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 1",
441 addr[0], len[0]);
442 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 2",
443 addr[1], len[1]);
444 hmac_sha1_vector(data->cmk, 20, 2, addr, len, mac);
445 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC",
446 mac, SHA1_MAC_LEN);
447 data->crypto_binding_sent = 1;
448 }
449
450 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 TLV data",
451 buf);
452
453 encr_req = eap_server_tls_encrypt(sm, &data->ssl, wpabuf_head(buf),
454 wpabuf_len(buf));
455 wpabuf_free(buf);
456
457 return encr_req;
458 }
459
460
461 static struct wpabuf * eap_peap_build_phase2_term(struct eap_sm *sm,
462 struct eap_peap_data *data,
463 u8 id, int success)
464 {
465 struct wpabuf *encr_req;
466 size_t req_len;
467 struct eap_hdr *hdr;
468
469 req_len = sizeof(*hdr);
470 hdr = os_zalloc(req_len);
471 if (hdr == NULL)
472 return NULL;
473
474 hdr->code = success ? EAP_CODE_SUCCESS : EAP_CODE_FAILURE;
475 hdr->identifier = id;
476 hdr->length = host_to_be16(req_len);
477
478 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: Encrypting Phase 2 data",
479 (u8 *) hdr, req_len);
480
481 encr_req = eap_server_tls_encrypt(sm, &data->ssl, (u8 *) hdr, req_len);
482 os_free(hdr);
483
484 return encr_req;
485 }
486
487
488 static struct wpabuf * eap_peap_buildReq(struct eap_sm *sm, void *priv, u8 id)
489 {
490 struct eap_peap_data *data = priv;
491
492 if (data->ssl.state == FRAG_ACK) {
493 return eap_server_tls_build_ack(id, EAP_TYPE_PEAP,
494 data->peap_version);
495 }
496
497 if (data->ssl.state == WAIT_FRAG_ACK) {
498 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_PEAP,
499 data->peap_version, id);
500 }
501
502 switch (data->state) {
503 case START:
504 return eap_peap_build_start(sm, data, id);
505 case PHASE1:
506 case PHASE1_ID2:
507 if (data->peap_version < 2 &&
508 tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
509 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase1 done, "
510 "starting Phase2");
511 eap_peap_state(data, PHASE2_START);
512 }
513 break;
514 case PHASE2_ID:
515 case PHASE2_METHOD:
516 wpabuf_free(data->ssl.out_buf);
517 data->ssl.out_used = 0;
518 data->ssl.out_buf = eap_peap_build_phase2_req(sm, data, id);
519 break;
520 #ifdef EAP_TNC
521 case PHASE2_SOH:
522 wpabuf_free(data->ssl.out_buf);
523 data->ssl.out_used = 0;
524 data->ssl.out_buf = eap_peap_build_phase2_soh(sm, data, id);
525 break;
526 #endif /* EAP_TNC */
527 case PHASE2_TLV:
528 wpabuf_free(data->ssl.out_buf);
529 data->ssl.out_used = 0;
530 data->ssl.out_buf = eap_peap_build_phase2_tlv(sm, data, id);
531 break;
532 case SUCCESS_REQ:
533 wpabuf_free(data->ssl.out_buf);
534 data->ssl.out_used = 0;
535 data->ssl.out_buf = eap_peap_build_phase2_term(sm, data, id,
536 1);
537 break;
538 case FAILURE_REQ:
539 wpabuf_free(data->ssl.out_buf);
540 data->ssl.out_used = 0;
541 data->ssl.out_buf = eap_peap_build_phase2_term(sm, data, id,
542 0);
543 break;
544 default:
545 wpa_printf(MSG_DEBUG, "EAP-PEAP: %s - unexpected state %d",
546 __func__, data->state);
547 return NULL;
548 }
549
550 return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_PEAP,
551 data->peap_version, id);
552 }
553
554
555 static Boolean eap_peap_check(struct eap_sm *sm, void *priv,
556 struct wpabuf *respData)
557 {
558 const u8 *pos;
559 size_t len;
560
561 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_PEAP, respData, &len);
562 if (pos == NULL || len < 1) {
563 wpa_printf(MSG_INFO, "EAP-PEAP: Invalid frame");
564 return TRUE;
565 }
566
567 return FALSE;
568 }
569
570
571 static int eap_peap_phase2_init(struct eap_sm *sm, struct eap_peap_data *data,
572 EapType eap_type)
573 {
574 if (data->phase2_priv && data->phase2_method) {
575 data->phase2_method->reset(sm, data->phase2_priv);
576 data->phase2_method = NULL;
577 data->phase2_priv = NULL;
578 }
579 data->phase2_method = eap_server_get_eap_method(EAP_VENDOR_IETF,
580 eap_type);
581 if (!data->phase2_method)
582 return -1;
583
584 sm->init_phase2 = 1;
585 data->phase2_priv = data->phase2_method->init(sm);
586 sm->init_phase2 = 0;
587 return 0;
588 }
589
590
591 static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
592 struct eap_peap_data *data,
593 const u8 *crypto_tlv,
594 size_t crypto_tlv_len)
595 {
596 u8 buf[61], mac[SHA1_MAC_LEN];
597 const u8 *pos;
598
599 if (crypto_tlv_len != 4 + 56) {
600 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid cryptobinding TLV "
601 "length %d", (int) crypto_tlv_len);
602 return -1;
603 }
604
605 pos = crypto_tlv;
606 pos += 4; /* TLV header */
607 if (pos[1] != data->peap_version) {
608 wpa_printf(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV Version "
609 "mismatch (was %d; expected %d)",
610 pos[1], data->peap_version);
611 return -1;
612 }
613
614 if (pos[3] != 1) {
615 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV "
616 "SubType %d", pos[3]);
617 return -1;
618 }
619 pos += 4;
620 pos += 32; /* Nonce */
621
622 /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
623 os_memcpy(buf, crypto_tlv, 60);
624 os_memset(buf + 4 + 4 + 32, 0, 20); /* Compound_MAC */
625 buf[60] = EAP_TYPE_PEAP;
626 hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);
627
628 if (os_memcmp(mac, pos, SHA1_MAC_LEN) != 0) {
629 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
630 "cryptobinding TLV");
631 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK", data->cmk, 20);
632 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding seed data",
633 buf, 61);
634 return -1;
635 }
636
637 wpa_printf(MSG_DEBUG, "EAP-PEAP: Valid cryptobinding TLV received");
638
639 return 0;
640 }
641
642
643 static void eap_peap_process_phase2_tlv(struct eap_sm *sm,
644 struct eap_peap_data *data,
645 struct wpabuf *in_data)
646 {
647 const u8 *pos;
648 size_t left;
649 const u8 *result_tlv = NULL, *crypto_tlv = NULL;
650 size_t result_tlv_len = 0, crypto_tlv_len = 0;
651 int tlv_type, mandatory, tlv_len;
652
653 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, in_data, &left);
654 if (pos == NULL) {
655 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid EAP-TLV header");
656 return;
657 }
658
659 /* Parse TLVs */
660 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received TLVs", pos, left);
661 while (left >= 4) {
662 mandatory = !!(pos[0] & 0x80);
663 tlv_type = pos[0] & 0x3f;
664 tlv_type = (tlv_type << 8) | pos[1];
665 tlv_len = ((int) pos[2] << 8) | pos[3];
666 pos += 4;
667 left -= 4;
668 if ((size_t) tlv_len > left) {
669 wpa_printf(MSG_DEBUG, "EAP-PEAP: TLV underrun "
670 "(tlv_len=%d left=%lu)", tlv_len,
671 (unsigned long) left);
672 eap_peap_state(data, FAILURE);
673 return;
674 }
675 switch (tlv_type) {
676 case EAP_TLV_RESULT_TLV:
677 result_tlv = pos;
678 result_tlv_len = tlv_len;
679 break;
680 case EAP_TLV_CRYPTO_BINDING_TLV:
681 crypto_tlv = pos;
682 crypto_tlv_len = tlv_len;
683 break;
684 default:
685 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unsupported TLV Type "
686 "%d%s", tlv_type,
687 mandatory ? " (mandatory)" : "");
688 if (mandatory) {
689 eap_peap_state(data, FAILURE);
690 return;
691 }
692 /* Ignore this TLV, but process other TLVs */
693 break;
694 }
695
696 pos += tlv_len;
697 left -= tlv_len;
698 }
699 if (left) {
700 wpa_printf(MSG_DEBUG, "EAP-PEAP: Last TLV too short in "
701 "Request (left=%lu)", (unsigned long) left);
702 eap_peap_state(data, FAILURE);
703 return;
704 }
705
706 /* Process supported TLVs */
707 if (crypto_tlv && data->crypto_binding_sent) {
708 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV",
709 crypto_tlv, crypto_tlv_len);
710 if (eap_tlv_validate_cryptobinding(sm, data, crypto_tlv - 4,
711 crypto_tlv_len + 4) < 0) {
712 eap_peap_state(data, FAILURE);
713 return;
714 }
715 data->crypto_binding_used = 1;
716 } else if (!crypto_tlv && data->crypto_binding_sent &&
717 data->crypto_binding == REQUIRE_BINDING) {
718 wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV");
719 eap_peap_state(data, FAILURE);
720 return;
721 }
722
723 if (result_tlv) {
724 int status;
725 const char *requested;
726
727 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Result TLV",
728 result_tlv, result_tlv_len);
729 if (result_tlv_len < 2) {
730 wpa_printf(MSG_INFO, "EAP-PEAP: Too short Result TLV "
731 "(len=%lu)",
732 (unsigned long) result_tlv_len);
733 eap_peap_state(data, FAILURE);
734 return;
735 }
736 requested = data->tlv_request == TLV_REQ_SUCCESS ? "Success" :
737 "Failure";
738 status = WPA_GET_BE16(result_tlv);
739 if (status == EAP_TLV_RESULT_SUCCESS) {
740 wpa_printf(MSG_INFO, "EAP-PEAP: TLV Result - Success "
741 "- requested %s", requested);
742 if (data->tlv_request == TLV_REQ_SUCCESS)
743 eap_peap_state(data, SUCCESS);
744 else
745 eap_peap_state(data, FAILURE);
746
747 } else if (status == EAP_TLV_RESULT_FAILURE) {
748 wpa_printf(MSG_INFO, "EAP-PEAP: TLV Result - Failure "
749 "- requested %s", requested);
750 eap_peap_state(data, FAILURE);
751 } else {
752 wpa_printf(MSG_INFO, "EAP-PEAP: Unknown TLV Result "
753 "Status %d", status);
754 eap_peap_state(data, FAILURE);
755 }
756 }
757 }
758
759
760 #ifdef EAP_TNC
761 static void eap_peap_process_phase2_soh(struct eap_sm *sm,
762 struct eap_peap_data *data,
763 struct wpabuf *in_data)
764 {
765 const u8 *pos, *vpos;
766 size_t left;
767 const u8 *soh_tlv = NULL;
768 size_t soh_tlv_len = 0;
769 int tlv_type, mandatory, tlv_len, vtlv_len;
770 u8 next_type;
771 u32 vendor_id;
772
773 pos = eap_hdr_validate(EAP_VENDOR_MICROSOFT, 0x21, in_data, &left);
774 if (pos == NULL) {
775 wpa_printf(MSG_DEBUG, "EAP-PEAP: Not a valid SoH EAP "
776 "Extensions Method header - skip TNC");
777 goto auth_method;
778 }
779
780 /* Parse TLVs */
781 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received TLVs (SoH)", pos, left);
782 while (left >= 4) {
783 mandatory = !!(pos[0] & 0x80);
784 tlv_type = pos[0] & 0x3f;
785 tlv_type = (tlv_type << 8) | pos[1];
786 tlv_len = ((int) pos[2] << 8) | pos[3];
787 pos += 4;
788 left -= 4;
789 if ((size_t) tlv_len > left) {
790 wpa_printf(MSG_DEBUG, "EAP-PEAP: TLV underrun "
791 "(tlv_len=%d left=%lu)", tlv_len,
792 (unsigned long) left);
793 eap_peap_state(data, FAILURE);
794 return;
795 }
796 switch (tlv_type) {
797 case EAP_TLV_VENDOR_SPECIFIC_TLV:
798 if (tlv_len < 4) {
799 wpa_printf(MSG_DEBUG, "EAP-PEAP: Too short "
800 "vendor specific TLV (len=%d)",
801 (int) tlv_len);
802 eap_peap_state(data, FAILURE);
803 return;
804 }
805
806 vendor_id = WPA_GET_BE32(pos);
807 if (vendor_id != EAP_VENDOR_MICROSOFT) {
808 if (mandatory) {
809 eap_peap_state(data, FAILURE);
810 return;
811 }
812 break;
813 }
814
815 vpos = pos + 4;
816 mandatory = !!(vpos[0] & 0x80);
817 tlv_type = vpos[0] & 0x3f;
818 tlv_type = (tlv_type << 8) | vpos[1];
819 vtlv_len = ((int) vpos[2] << 8) | vpos[3];
820 vpos += 4;
821 if (vpos + vtlv_len > pos + left) {
822 wpa_printf(MSG_DEBUG, "EAP-PEAP: Vendor TLV "
823 "underrun");
824 eap_peap_state(data, FAILURE);
825 return;
826 }
827
828 if (tlv_type == 1) {
829 soh_tlv = vpos;
830 soh_tlv_len = vtlv_len;
831 break;
832 }
833
834 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unsupported MS-TLV "
835 "Type %d%s", tlv_type,
836 mandatory ? " (mandatory)" : "");
837 if (mandatory) {
838 eap_peap_state(data, FAILURE);
839 return;
840 }
841 /* Ignore this TLV, but process other TLVs */
842 break;
843 default:
844 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unsupported TLV Type "
845 "%d%s", tlv_type,
846 mandatory ? " (mandatory)" : "");
847 if (mandatory) {
848 eap_peap_state(data, FAILURE);
849 return;
850 }
851 /* Ignore this TLV, but process other TLVs */
852 break;
853 }
854
855 pos += tlv_len;
856 left -= tlv_len;
857 }
858 if (left) {
859 wpa_printf(MSG_DEBUG, "EAP-PEAP: Last TLV too short in "
860 "Request (left=%lu)", (unsigned long) left);
861 eap_peap_state(data, FAILURE);
862 return;
863 }
864
865 /* Process supported TLVs */
866 if (soh_tlv) {
867 int failure = 0;
868 wpabuf_free(data->soh_response);
869 data->soh_response = tncs_process_soh(soh_tlv, soh_tlv_len,
870 &failure);
871 if (failure) {
872 eap_peap_state(data, FAILURE);
873 return;
874 }
875 } else {
876 wpa_printf(MSG_DEBUG, "EAP-PEAP: No SoH TLV received");
877 eap_peap_state(data, FAILURE);
878 return;
879 }
880
881 auth_method:
882 eap_peap_state(data, PHASE2_METHOD);
883 next_type = sm->user->methods[0].method;
884 sm->user_eap_method_index = 1;
885 wpa_printf(MSG_DEBUG, "EAP-PEAP: try EAP type %d", next_type);
886 eap_peap_phase2_init(sm, data, next_type);
887 }
888 #endif /* EAP_TNC */
889
890
891 static void eap_peap_process_phase2_response(struct eap_sm *sm,
892 struct eap_peap_data *data,
893 struct wpabuf *in_data)
894 {
895 u8 next_type = EAP_TYPE_NONE;
896 const struct eap_hdr *hdr;
897 const u8 *pos;
898 size_t left;
899
900 if (data->state == PHASE2_TLV) {
901 eap_peap_process_phase2_tlv(sm, data, in_data);
902 return;
903 }
904
905 #ifdef EAP_TNC
906 if (data->state == PHASE2_SOH) {
907 eap_peap_process_phase2_soh(sm, data, in_data);
908 return;
909 }
910 #endif /* EAP_TNC */
911
912 if (data->phase2_priv == NULL) {
913 wpa_printf(MSG_DEBUG, "EAP-PEAP: %s - Phase2 not "
914 "initialized?!", __func__);
915 return;
916 }
917
918 hdr = wpabuf_head(in_data);
919 pos = (const u8 *) (hdr + 1);
920
921 if (wpabuf_len(in_data) > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
922 left = wpabuf_len(in_data) - sizeof(*hdr);
923 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Phase2 type Nak'ed; "
924 "allowed types", pos + 1, left - 1);
925 eap_sm_process_nak(sm, pos + 1, left - 1);
926 if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
927 sm->user->methods[sm->user_eap_method_index].method !=
928 EAP_TYPE_NONE) {
929 next_type = sm->user->methods[
930 sm->user_eap_method_index++].method;
931 wpa_printf(MSG_DEBUG, "EAP-PEAP: try EAP type %d",
932 next_type);
933 } else {
934 eap_peap_req_failure(sm, data);
935 next_type = EAP_TYPE_NONE;
936 }
937 eap_peap_phase2_init(sm, data, next_type);
938 return;
939 }
940
941 if (data->phase2_method->check(sm, data->phase2_priv, in_data)) {
942 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase2 check() asked to "
943 "ignore the packet");
944 return;
945 }
946
947 data->phase2_method->process(sm, data->phase2_priv, in_data);
948
949 if (sm->method_pending == METHOD_PENDING_WAIT) {
950 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase2 method is in "
951 "pending wait state - save decrypted response");
952 wpabuf_free(data->pending_phase2_resp);
953 data->pending_phase2_resp = wpabuf_dup(in_data);
954 }
955
956 if (!data->phase2_method->isDone(sm, data->phase2_priv))
957 return;
958
959 if (!data->phase2_method->isSuccess(sm, data->phase2_priv)) {
960 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase2 method failed");
961 eap_peap_req_failure(sm, data);
962 next_type = EAP_TYPE_NONE;
963 eap_peap_phase2_init(sm, data, next_type);
964 return;
965 }
966
967 os_free(data->phase2_key);
968 if (data->phase2_method->getKey) {
969 data->phase2_key = data->phase2_method->getKey(
970 sm, data->phase2_priv, &data->phase2_key_len);
971 if (data->phase2_key == NULL) {
972 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase2 getKey "
973 "failed");
974 eap_peap_req_failure(sm, data);
975 eap_peap_phase2_init(sm, data, EAP_TYPE_NONE);
976 return;
977 }
978
979 if (data->phase2_key_len == 32 &&
980 data->phase2_method->vendor == EAP_VENDOR_IETF &&
981 data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
982 /*
983 * Microsoft uses reverse order for MS-MPPE keys in
984 * EAP-PEAP when compared to EAP-FAST derivation of
985 * ISK. Swap the keys here to get the correct ISK for
986 * EAP-PEAPv0 cryptobinding.
987 */
988 u8 tmp[16];
989 os_memcpy(tmp, data->phase2_key, 16);
990 os_memcpy(data->phase2_key, data->phase2_key + 16, 16);
991 os_memcpy(data->phase2_key + 16, tmp, 16);
992 }
993 }
994
995 switch (data->state) {
996 case PHASE1_ID2:
997 case PHASE2_ID:
998 case PHASE2_SOH:
999 if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1000 wpa_hexdump_ascii(MSG_DEBUG, "EAP_PEAP: Phase2 "
1001 "Identity not found in the user "
1002 "database",
1003 sm->identity, sm->identity_len);
1004 eap_peap_req_failure(sm, data);
1005 next_type = EAP_TYPE_NONE;
1006 break;
1007 }
1008
1009 #ifdef EAP_TNC
1010 if (data->state != PHASE2_SOH && sm->tnc &&
1011 data->peap_version == 0) {
1012 eap_peap_state(data, PHASE2_SOH);
1013 wpa_printf(MSG_DEBUG, "EAP-PEAP: Try to initialize "
1014 "TNC (NAP SOH)");
1015 next_type = EAP_TYPE_NONE;
1016 break;
1017 }
1018 #endif /* EAP_TNC */
1019
1020 eap_peap_state(data, PHASE2_METHOD);
1021 next_type = sm->user->methods[0].method;
1022 sm->user_eap_method_index = 1;
1023 wpa_printf(MSG_DEBUG, "EAP-PEAP: try EAP type %d", next_type);
1024 break;
1025 case PHASE2_METHOD:
1026 eap_peap_req_success(sm, data);
1027 next_type = EAP_TYPE_NONE;
1028 break;
1029 case FAILURE:
1030 break;
1031 default:
1032 wpa_printf(MSG_DEBUG, "EAP-PEAP: %s - unexpected state %d",
1033 __func__, data->state);
1034 break;
1035 }
1036
1037 eap_peap_phase2_init(sm, data, next_type);
1038 }
1039
1040
1041 static void eap_peap_process_phase2(struct eap_sm *sm,
1042 struct eap_peap_data *data,
1043 const struct wpabuf *respData,
1044 struct wpabuf *in_buf)
1045 {
1046 struct wpabuf *in_decrypted;
1047 int len_decrypted;
1048 const struct eap_hdr *hdr;
1049 size_t buf_len, len;
1050 u8 *in_data;
1051 size_t in_len;
1052
1053 in_data = wpabuf_mhead(in_buf);
1054 in_len = wpabuf_len(in_buf);
1055
1056 wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
1057 " Phase 2", (unsigned long) in_len);
1058
1059 if (data->pending_phase2_resp) {
1060 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
1061 "skip decryption and use old data");
1062 eap_peap_process_phase2_response(sm, data,
1063 data->pending_phase2_resp);
1064 wpabuf_free(data->pending_phase2_resp);
1065 data->pending_phase2_resp = NULL;
1066 return;
1067 }
1068
1069 buf_len = in_len;
1070 /*
1071 * Even though we try to disable TLS compression, it is possible that
1072 * this cannot be done with all TLS libraries. Add extra buffer space
1073 * to handle the possibility of the decrypted data being longer than
1074 * input data.
1075 */
1076 buf_len += 500;
1077 buf_len *= 3;
1078 in_decrypted = wpabuf_alloc(buf_len);
1079 if (in_decrypted == NULL) {
1080 wpa_printf(MSG_WARNING, "EAP-PEAP: failed to allocate memory "
1081 "for decryption");
1082 return;
1083 }
1084
1085 len_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
1086 in_data, in_len,
1087 wpabuf_mhead(in_decrypted),
1088 buf_len);
1089 if (len_decrypted < 0) {
1090 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to decrypt Phase 2 "
1091 "data");
1092 wpabuf_free(in_decrypted);
1093 eap_peap_state(data, FAILURE);
1094 return;
1095 }
1096 wpabuf_put(in_decrypted, len_decrypted);
1097
1098 wpa_hexdump_buf_key(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP",
1099 in_decrypted);
1100
1101 hdr = wpabuf_head(in_decrypted);
1102
1103 if (data->peap_version == 0 && data->state != PHASE2_TLV) {
1104 const struct eap_hdr *resp;
1105 struct eap_hdr *nhdr;
1106 struct wpabuf *nbuf =
1107 wpabuf_alloc(sizeof(struct eap_hdr) +
1108 wpabuf_len(in_decrypted));
1109 if (nbuf == NULL) {
1110 wpabuf_free(in_decrypted);
1111 return;
1112 }
1113
1114 resp = wpabuf_head(respData);
1115 nhdr = wpabuf_put(nbuf, sizeof(*nhdr));
1116 nhdr->code = resp->code;
1117 nhdr->identifier = resp->identifier;
1118 nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
1119 wpabuf_len(in_decrypted));
1120 wpabuf_put_buf(nbuf, in_decrypted);
1121 wpabuf_free(in_decrypted);
1122
1123 in_decrypted = nbuf;
1124 } else if (data->peap_version >= 2) {
1125 struct eap_tlv_hdr *tlv;
1126 struct wpabuf *nmsg;
1127
1128 if (wpabuf_len(in_decrypted) < sizeof(*tlv) + sizeof(*hdr)) {
1129 wpa_printf(MSG_INFO, "EAP-PEAPv2: Too short Phase 2 "
1130 "EAP TLV");
1131 wpabuf_free(in_decrypted);
1132 return;
1133 }
1134 tlv = wpabuf_mhead(in_decrypted);
1135 if ((be_to_host16(tlv->tlv_type) & EAP_TLV_TYPE_MASK) !=
1136 EAP_TLV_EAP_PAYLOAD_TLV) {
1137 wpa_printf(MSG_INFO, "EAP-PEAPv2: Not an EAP TLV");
1138 wpabuf_free(in_decrypted);
1139 return;
1140 }
1141 if (sizeof(*tlv) + be_to_host16(tlv->length) >
1142 wpabuf_len(in_decrypted)) {
1143 wpa_printf(MSG_INFO, "EAP-PEAPv2: Invalid EAP TLV "
1144 "length");
1145 wpabuf_free(in_decrypted);
1146 return;
1147 }
1148 hdr = (struct eap_hdr *) (tlv + 1);
1149 if (be_to_host16(hdr->length) > be_to_host16(tlv->length)) {
1150 wpa_printf(MSG_INFO, "EAP-PEAPv2: No room for full "
1151 "EAP packet in EAP TLV");
1152 wpabuf_free(in_decrypted);
1153 return;
1154 }
1155
1156 nmsg = wpabuf_alloc(be_to_host16(hdr->length));
1157 if (nmsg == NULL) {
1158 wpabuf_free(in_decrypted);
1159 return;
1160 }
1161
1162 wpabuf_put_data(nmsg, hdr, be_to_host16(hdr->length));
1163 wpabuf_free(in_decrypted);
1164 in_decrypted = nmsg;
1165 }
1166
1167 hdr = wpabuf_head(in_decrypted);
1168 if (wpabuf_len(in_decrypted) < (int) sizeof(*hdr)) {
1169 wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
1170 "EAP frame (len=%lu)",
1171 (unsigned long) wpabuf_len(in_decrypted));
1172 wpabuf_free(in_decrypted);
1173 eap_peap_req_failure(sm, data);
1174 return;
1175 }
1176 len = be_to_host16(hdr->length);
1177 if (len > wpabuf_len(in_decrypted)) {
1178 wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in "
1179 "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
1180 (unsigned long) wpabuf_len(in_decrypted),
1181 (unsigned long) len);
1182 wpabuf_free(in_decrypted);
1183 eap_peap_req_failure(sm, data);
1184 return;
1185 }
1186 wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d "
1187 "identifier=%d length=%lu", hdr->code, hdr->identifier,
1188 (unsigned long) len);
1189 switch (hdr->code) {
1190 case EAP_CODE_RESPONSE:
1191 eap_peap_process_phase2_response(sm, data, in_decrypted);
1192 break;
1193 case EAP_CODE_SUCCESS:
1194 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success");
1195 if (data->state == SUCCESS_REQ) {
1196 eap_peap_state(data, SUCCESS);
1197 }
1198 break;
1199 case EAP_CODE_FAILURE:
1200 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure");
1201 eap_peap_state(data, FAILURE);
1202 break;
1203 default:
1204 wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
1205 "Phase 2 EAP header", hdr->code);
1206 break;
1207 }
1208
1209 os_free(in_decrypted);
1210 }
1211
1212
1213 static int eap_peapv2_start_phase2(struct eap_sm *sm,
1214 struct eap_peap_data *data)
1215 {
1216 struct wpabuf *buf, *buf2;
1217 int res;
1218
1219 wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Phase1 done, include first Phase2 "
1220 "payload in the same message");
1221 eap_peap_state(data, PHASE1_ID2);
1222 if (eap_peap_phase2_init(sm, data, EAP_TYPE_IDENTITY))
1223 return -1;
1224
1225 /* TODO: which Id to use here? */
1226 buf = data->phase2_method->buildReq(sm, data->phase2_priv, 6);
1227 if (buf == NULL)
1228 return -1;
1229
1230 buf2 = eap_peapv2_tlv_eap_payload(buf);
1231 if (buf2 == NULL)
1232 return -1;
1233
1234 wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAPv2: Identity Request", buf2);
1235
1236 buf = wpabuf_alloc(data->ssl.tls_out_limit);
1237 if (buf == NULL) {
1238 wpabuf_free(buf2);
1239 return -1;
1240 }
1241
1242 res = tls_connection_encrypt(sm->ssl_ctx, data->ssl.conn,
1243 wpabuf_head(buf2), wpabuf_len(buf2),
1244 wpabuf_put(buf, 0),
1245 data->ssl.tls_out_limit);
1246 wpabuf_free(buf2);
1247
1248 if (res < 0) {
1249 wpa_printf(MSG_INFO, "EAP-PEAPv2: Failed to encrypt Phase 2 "
1250 "data");
1251 wpabuf_free(buf);
1252 return -1;
1253 }
1254
1255 wpabuf_put(buf, res);
1256 wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAPv2: Encrypted Identity Request",
1257 buf);
1258
1259 /* Append TLS data into the pending buffer after the Server Finished */
1260 if (wpabuf_resize(&data->ssl.out_buf, wpabuf_len(buf)) < 0) {
1261 wpabuf_free(buf);
1262 return -1;
1263 }
1264 wpabuf_put_buf(data->ssl.out_buf, buf);
1265 wpabuf_free(buf);
1266
1267 return 0;
1268 }
1269
1270
1271 static int eap_peap_process_version(struct eap_sm *sm, void *priv,
1272 int peer_version)
1273 {
1274 struct eap_peap_data *data = priv;
1275
1276 data->recv_version = peer_version;
1277 if (data->force_version >= 0 && peer_version != data->force_version) {
1278 wpa_printf(MSG_INFO, "EAP-PEAP: peer did not select the forced"
1279 " version (forced=%d peer=%d) - reject",
1280 data->force_version, peer_version);
1281 return -1;
1282 }
1283 if (peer_version < data->peap_version) {
1284 wpa_printf(MSG_DEBUG, "EAP-PEAP: peer ver=%d, own ver=%d; "
1285 "use version %d",
1286 peer_version, data->peap_version, peer_version);
1287 data->peap_version = peer_version;
1288 }
1289
1290 return 0;
1291 }
1292
1293
1294 static void eap_peap_process_msg(struct eap_sm *sm, void *priv,
1295 const struct wpabuf *respData)
1296 {
1297 struct eap_peap_data *data = priv;
1298
1299 switch (data->state) {
1300 case PHASE1:
1301 if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
1302 eap_peap_state(data, FAILURE);
1303 break;
1304 }
1305
1306 if (data->peap_version >= 2 &&
1307 tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1308 if (eap_peapv2_start_phase2(sm, data)) {
1309 eap_peap_state(data, FAILURE);
1310 break;
1311 }
1312 }
1313 break;
1314 case PHASE2_START:
1315 eap_peap_state(data, PHASE2_ID);
1316 eap_peap_phase2_init(sm, data, EAP_TYPE_IDENTITY);
1317 break;
1318 case PHASE1_ID2:
1319 case PHASE2_ID:
1320 case PHASE2_METHOD:
1321 case PHASE2_SOH:
1322 case PHASE2_TLV:
1323 eap_peap_process_phase2(sm, data, respData, data->ssl.in_buf);
1324 break;
1325 case SUCCESS_REQ:
1326 eap_peap_state(data, SUCCESS);
1327 break;
1328 case FAILURE_REQ:
1329 eap_peap_state(data, FAILURE);
1330 break;
1331 default:
1332 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected state %d in %s",
1333 data->state, __func__);
1334 break;
1335 }
1336 }
1337
1338
1339 static void eap_peap_process(struct eap_sm *sm, void *priv,
1340 struct wpabuf *respData)
1341 {
1342 struct eap_peap_data *data = priv;
1343 if (eap_server_tls_process(sm, &data->ssl, respData, data,
1344 EAP_TYPE_PEAP, eap_peap_process_version,
1345 eap_peap_process_msg) < 0)
1346 eap_peap_state(data, FAILURE);
1347 }
1348
1349
1350 static Boolean eap_peap_isDone(struct eap_sm *sm, void *priv)
1351 {
1352 struct eap_peap_data *data = priv;
1353 return data->state == SUCCESS || data->state == FAILURE;
1354 }
1355
1356
1357 static u8 * eap_peap_getKey(struct eap_sm *sm, void *priv, size_t *len)
1358 {
1359 struct eap_peap_data *data = priv;
1360 u8 *eapKeyData;
1361
1362 if (data->state != SUCCESS)
1363 return NULL;
1364
1365 if (data->crypto_binding_used) {
1366 u8 csk[128];
1367 /*
1368 * Note: It looks like Microsoft implementation requires null
1369 * termination for this label while the one used for deriving
1370 * IPMK|CMK did not use null termination.
1371 */
1372 peap_prfplus(data->peap_version, data->ipmk, 40,
1373 "Session Key Generating Function",
1374 (u8 *) "\00", 1, csk, sizeof(csk));
1375 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk));
1376 eapKeyData = os_malloc(EAP_TLS_KEY_LEN);
1377 if (eapKeyData) {
1378 os_memcpy(eapKeyData, csk, EAP_TLS_KEY_LEN);
1379 *len = EAP_TLS_KEY_LEN;
1380 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
1381 eapKeyData, EAP_TLS_KEY_LEN);
1382 } else {
1383 wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to derive "
1384 "key");
1385 }
1386
1387 return eapKeyData;
1388 }
1389
1390 /* TODO: PEAPv1 - different label in some cases */
1391 eapKeyData = eap_server_tls_derive_key(sm, &data->ssl,
1392 "client EAP encryption",
1393 EAP_TLS_KEY_LEN);
1394 if (eapKeyData) {
1395 *len = EAP_TLS_KEY_LEN;
1396 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
1397 eapKeyData, EAP_TLS_KEY_LEN);
1398 } else {
1399 wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to derive key");
1400 }
1401
1402 return eapKeyData;
1403 }
1404
1405
1406 static Boolean eap_peap_isSuccess(struct eap_sm *sm, void *priv)
1407 {
1408 struct eap_peap_data *data = priv;
1409 return data->state == SUCCESS;
1410 }
1411
1412
1413 int eap_server_peap_register(void)
1414 {
1415 struct eap_method *eap;
1416 int ret;
1417
1418 eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1419 EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP");
1420 if (eap == NULL)
1421 return -1;
1422
1423 eap->init = eap_peap_init;
1424 eap->reset = eap_peap_reset;
1425 eap->buildReq = eap_peap_buildReq;
1426 eap->check = eap_peap_check;
1427 eap->process = eap_peap_process;
1428 eap->isDone = eap_peap_isDone;
1429 eap->getKey = eap_peap_getKey;
1430 eap->isSuccess = eap_peap_isSuccess;
1431
1432 ret = eap_server_method_register(eap);
1433 if (ret)
1434 eap_server_method_free(eap);
1435 return ret;
1436 }
NetBSD on the FriendlyARM MINI2440