1 /*
2 * EAP peer method: EAP-PEAP (draft-josefsson-pppext-eap-tls-eap-10.txt)
3 * Copyright (c) 2004-2008, 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 enum { NO_BINDING, OPTIONAL_BINDING, REQUIRE_BINDING } crypto_binding;
63 int crypto_binding_used;
64 u8 binding_nonce[32];
65 u8 ipmk[40];
66 u8 cmk[20];
67 int soh; /* Whether IF-TNCCS-SOH (Statement of Health; Microsoft NAP)
68 * is enabled. */
69 };
70
71
eap_peap_parse_phase1(struct eap_peap_data * data,const char * phase1)72 static int eap_peap_parse_phase1(struct eap_peap_data *data,
73 const char *phase1)
74 {
75 const char *pos;
76
77 pos = os_strstr(phase1, "peapver=");
78 if (pos) {
79 data->force_peap_version = atoi(pos + 8);
80 data->peap_version = data->force_peap_version;
81 wpa_printf(MSG_DEBUG, "EAP-PEAP: Forced PEAP version %d",
82 data->force_peap_version);
83 }
84
85 if (os_strstr(phase1, "peaplabel=1")) {
86 data->force_new_label = 1;
87 wpa_printf(MSG_DEBUG, "EAP-PEAP: Force new label for key "
88 "derivation");
89 }
90
91 if (os_strstr(phase1, "peap_outer_success=0")) {
92 data->peap_outer_success = 0;
93 wpa_printf(MSG_DEBUG, "EAP-PEAP: terminate authentication on "
94 "tunneled EAP-Success");
95 } else if (os_strstr(phase1, "peap_outer_success=1")) {
96 data->peap_outer_success = 1;
97 wpa_printf(MSG_DEBUG, "EAP-PEAP: send tunneled EAP-Success "
98 "after receiving tunneled EAP-Success");
99 } else if (os_strstr(phase1, "peap_outer_success=2")) {
100 data->peap_outer_success = 2;
101 wpa_printf(MSG_DEBUG, "EAP-PEAP: send PEAP/TLS ACK after "
102 "receiving tunneled EAP-Success");
103 }
104
105 if (os_strstr(phase1, "crypto_binding=0")) {
106 data->crypto_binding = NO_BINDING;
107 wpa_printf(MSG_DEBUG, "EAP-PEAP: Do not use cryptobinding");
108 } else if (os_strstr(phase1, "crypto_binding=1")) {
109 data->crypto_binding = OPTIONAL_BINDING;
110 wpa_printf(MSG_DEBUG, "EAP-PEAP: Optional cryptobinding");
111 } else if (os_strstr(phase1, "crypto_binding=2")) {
112 data->crypto_binding = REQUIRE_BINDING;
113 wpa_printf(MSG_DEBUG, "EAP-PEAP: Require cryptobinding");
114 }
115
116 #ifdef EAP_TNC
117 if (os_strstr(phase1, "tnc=soh2")) {
118 data->soh = 2;
119 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled");
120 } else if (os_strstr(phase1, "tnc=soh1")) {
121 data->soh = 1;
122 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 1 enabled");
123 } else if (os_strstr(phase1, "tnc=soh")) {
124 data->soh = 2;
125 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled");
126 }
127 #endif /* EAP_TNC */
128
129 return 0;
130 }
131
132
eap_peap_init(struct eap_sm * sm)133 static void * eap_peap_init(struct eap_sm *sm)
134 {
135 struct eap_peap_data *data;
136 struct eap_peer_config *config = eap_get_config(sm);
137
138 data = os_zalloc(sizeof(*data));
139 if (data == NULL)
140 return NULL;
141 sm->peap_done = FALSE;
142 data->peap_version = EAP_PEAP_VERSION;
143 data->force_peap_version = -1;
144 data->peap_outer_success = 2;
145 data->crypto_binding = OPTIONAL_BINDING;
146
147 if (config && config->phase1 &&
148 eap_peap_parse_phase1(data, config->phase1) < 0) {
149 eap_peap_deinit(sm, data);
150 return NULL;
151 }
152
153 if (eap_peer_select_phase2_methods(config, "auth=",
154 &data->phase2_types,
155 &data->num_phase2_types) < 0) {
156 eap_peap_deinit(sm, data);
157 return NULL;
158 }
159
160 data->phase2_type.vendor = EAP_VENDOR_IETF;
161 data->phase2_type.method = EAP_TYPE_NONE;
162
163 if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_PEAP)) {
164 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to initialize SSL.");
165 eap_peap_deinit(sm, data);
166 return NULL;
167 }
168
169 return data;
170 }
171
172
eap_peap_free_key(struct eap_peap_data * data)173 static void eap_peap_free_key(struct eap_peap_data *data)
174 {
175 if (data->key_data) {
176 bin_clear_free(data->key_data, EAP_TLS_KEY_LEN);
177 data->key_data = NULL;
178 }
179 }
180
181
eap_peap_deinit(struct eap_sm * sm,void * priv)182 static void eap_peap_deinit(struct eap_sm *sm, void *priv)
183 {
184 struct eap_peap_data *data = priv;
185 if (data == NULL)
186 return;
187 if (data->phase2_priv && data->phase2_method)
188 data->phase2_method->deinit(sm, data->phase2_priv);
189 os_free(data->phase2_types);
190 eap_peer_tls_ssl_deinit(sm, &data->ssl);
191 eap_peap_free_key(data);
192 os_free(data->session_id);
193 wpabuf_free(data->pending_phase2_req);
194 os_free(data);
195 }
196
197
198 /**
199 * eap_tlv_build_nak - Build EAP-TLV NAK message
200 * @id: EAP identifier for the header
201 * @nak_type: TLV type (EAP_TLV_*)
202 * Returns: Buffer to the allocated EAP-TLV NAK message or %NULL on failure
203 *
204 * This function builds an EAP-TLV NAK message. The caller is responsible for
205 * freeing the returned buffer.
206 */
eap_tlv_build_nak(int id,u16 nak_type)207 static struct wpabuf * eap_tlv_build_nak(int id, u16 nak_type)
208 {
209 struct wpabuf *msg;
210
211 msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, 10,
212 EAP_CODE_RESPONSE, id);
213 if (msg == NULL)
214 return NULL;
215
216 wpabuf_put_u8(msg, 0x80); /* Mandatory */
217 wpabuf_put_u8(msg, EAP_TLV_NAK_TLV);
218 wpabuf_put_be16(msg, 6); /* Length */
219 wpabuf_put_be32(msg, 0); /* Vendor-Id */
220 wpabuf_put_be16(msg, nak_type); /* NAK-Type */
221
222 return msg;
223 }
224
225
eap_peap_get_isk(struct eap_sm * sm,struct eap_peap_data * data,u8 * isk,size_t isk_len)226 static int eap_peap_get_isk(struct eap_sm *sm, struct eap_peap_data *data,
227 u8 *isk, size_t isk_len)
228 {
229 u8 *key;
230 size_t key_len;
231
232 os_memset(isk, 0, isk_len);
233 if (data->phase2_method == NULL || data->phase2_priv == NULL ||
234 data->phase2_method->isKeyAvailable == NULL ||
235 data->phase2_method->getKey == NULL)
236 return 0;
237
238 if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
239 (key = data->phase2_method->getKey(sm, data->phase2_priv,
240 &key_len)) == NULL) {
241 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not get key material "
242 "from Phase 2");
243 return -1;
244 }
245
246 if (key_len > isk_len)
247 key_len = isk_len;
248 os_memcpy(isk, key, key_len);
249 os_free(key);
250
251 return 0;
252 }
253
254
eap_peap_derive_cmk(struct eap_sm * sm,struct eap_peap_data * data)255 static int eap_peap_derive_cmk(struct eap_sm *sm, struct eap_peap_data *data)
256 {
257 u8 *tk;
258 u8 isk[32], imck[60];
259
260 /*
261 * Tunnel key (TK) is the first 60 octets of the key generated by
262 * phase 1 of PEAP (based on TLS).
263 */
264 tk = data->key_data;
265 if (tk == NULL)
266 return -1;
267 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TK", tk, 60);
268
269 if (data->reauth &&
270 tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) {
271 /* Fast-connect: IPMK|CMK = TK */
272 os_memcpy(data->ipmk, tk, 40);
273 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK from TK",
274 data->ipmk, 40);
275 os_memcpy(data->cmk, tk + 40, 20);
276 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK from TK",
277 data->cmk, 20);
278 return 0;
279 }
280
281 if (eap_peap_get_isk(sm, data, isk, sizeof(isk)) < 0)
282 return -1;
283 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: ISK", isk, sizeof(isk));
284
285 /*
286 * IPMK Seed = "Inner Methods Compound Keys" | ISK
287 * TempKey = First 40 octets of TK
288 * IPMK|CMK = PRF+(TempKey, IPMK Seed, 60)
289 * (note: draft-josefsson-pppext-eap-tls-eap-10.txt includes a space
290 * in the end of the label just before ISK; is that just a typo?)
291 */
292 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TempKey", tk, 40);
293 if (peap_prfplus(data->peap_version, tk, 40,
294 "Inner Methods Compound Keys",
295 isk, sizeof(isk), imck, sizeof(imck)) < 0)
296 return -1;
297 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IMCK (IPMKj)",
298 imck, sizeof(imck));
299
300 os_memcpy(data->ipmk, imck, 40);
301 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK (S-IPMKj)", data->ipmk, 40);
302 os_memcpy(data->cmk, imck + 40, 20);
303 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK (CMKj)", data->cmk, 20);
304
305 return 0;
306 }
307
308
eap_tlv_add_cryptobinding(struct eap_sm * sm,struct eap_peap_data * data,struct wpabuf * buf)309 static int eap_tlv_add_cryptobinding(struct eap_sm *sm,
310 struct eap_peap_data *data,
311 struct wpabuf *buf)
312 {
313 u8 *mac;
314 u8 eap_type = EAP_TYPE_PEAP;
315 const u8 *addr[2];
316 size_t len[2];
317 u16 tlv_type;
318
319 /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
320 addr[0] = wpabuf_put(buf, 0);
321 len[0] = 60;
322 addr[1] = &eap_type;
323 len[1] = 1;
324
325 tlv_type = EAP_TLV_CRYPTO_BINDING_TLV;
326 wpabuf_put_be16(buf, tlv_type);
327 wpabuf_put_be16(buf, 56);
328
329 wpabuf_put_u8(buf, 0); /* Reserved */
330 wpabuf_put_u8(buf, data->peap_version); /* Version */
331 wpabuf_put_u8(buf, data->peap_version); /* RecvVersion */
332 wpabuf_put_u8(buf, 1); /* SubType: 0 = Request, 1 = Response */
333 wpabuf_put_data(buf, data->binding_nonce, 32); /* Nonce */
334 mac = wpabuf_put(buf, 20); /* Compound_MAC */
335 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC CMK", data->cmk, 20);
336 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 1",
337 addr[0], len[0]);
338 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 2",
339 addr[1], len[1]);
340 hmac_sha1_vector(data->cmk, 20, 2, addr, len, mac);
341 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC", mac, SHA1_MAC_LEN);
342 data->crypto_binding_used = 1;
343
344 return 0;
345 }
346
347
348 /**
349 * eap_tlv_build_result - Build EAP-TLV Result message
350 * @id: EAP identifier for the header
351 * @status: Status (EAP_TLV_RESULT_SUCCESS or EAP_TLV_RESULT_FAILURE)
352 * Returns: Buffer to the allocated EAP-TLV Result message or %NULL on failure
353 *
354 * This function builds an EAP-TLV Result message. The caller is responsible
355 * for freeing the returned buffer.
356 */
eap_tlv_build_result(struct eap_sm * sm,struct eap_peap_data * data,int crypto_tlv_used,int id,u16 status)357 static struct wpabuf * eap_tlv_build_result(struct eap_sm *sm,
358 struct eap_peap_data *data,
359 int crypto_tlv_used,
360 int id, u16 status)
361 {
362 struct wpabuf *msg;
363 size_t len;
364
365 if (data->crypto_binding == NO_BINDING)
366 crypto_tlv_used = 0;
367
368 len = 6;
369 if (crypto_tlv_used)
370 len += 60; /* Cryptobinding TLV */
371 msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, len,
372 EAP_CODE_RESPONSE, id);
373 if (msg == NULL)
374 return NULL;
375
376 wpabuf_put_u8(msg, 0x80); /* Mandatory */
377 wpabuf_put_u8(msg, EAP_TLV_RESULT_TLV);
378 wpabuf_put_be16(msg, 2); /* Length */
379 wpabuf_put_be16(msg, status); /* Status */
380
381 if (crypto_tlv_used && eap_tlv_add_cryptobinding(sm, data, msg)) {
382 wpabuf_free(msg);
383 return NULL;
384 }
385
386 return msg;
387 }
388
389
eap_tlv_validate_cryptobinding(struct eap_sm * sm,struct eap_peap_data * data,const u8 * crypto_tlv,size_t crypto_tlv_len)390 static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
391 struct eap_peap_data *data,
392 const u8 *crypto_tlv,
393 size_t crypto_tlv_len)
394 {
395 u8 buf[61], mac[SHA1_MAC_LEN];
396 const u8 *pos;
397
398 if (eap_peap_derive_cmk(sm, data) < 0) {
399 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not derive CMK");
400 return -1;
401 }
402
403 if (crypto_tlv_len != 4 + 56) {
404 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid cryptobinding TLV "
405 "length %d", (int) crypto_tlv_len);
406 return -1;
407 }
408
409 pos = crypto_tlv;
410 pos += 4; /* TLV header */
411 if (pos[1] != data->peap_version) {
412 wpa_printf(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV Version "
413 "mismatch (was %d; expected %d)",
414 pos[1], data->peap_version);
415 return -1;
416 }
417
418 if (pos[3] != 0) {
419 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV "
420 "SubType %d", pos[3]);
421 return -1;
422 }
423 pos += 4;
424 os_memcpy(data->binding_nonce, pos, 32);
425 pos += 32; /* Nonce */
426
427 /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
428 os_memcpy(buf, crypto_tlv, 60);
429 os_memset(buf + 4 + 4 + 32, 0, 20); /* Compound_MAC */
430 buf[60] = EAP_TYPE_PEAP;
431 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Compound_MAC data",
432 buf, sizeof(buf));
433 hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);
434
435 if (os_memcmp_const(mac, pos, SHA1_MAC_LEN) != 0) {
436 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
437 "cryptobinding TLV");
438 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received MAC",
439 pos, SHA1_MAC_LEN);
440 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Expected MAC",
441 mac, SHA1_MAC_LEN);
442 return -1;
443 }
444
445 wpa_printf(MSG_DEBUG, "EAP-PEAP: Valid cryptobinding TLV received");
446
447 return 0;
448 }
449
450
451 /**
452 * eap_tlv_process - Process a received EAP-TLV message and generate a response
453 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
454 * @ret: Return values from EAP request validation and processing
455 * @req: EAP-TLV request to be processed. The caller must have validated that
456 * the buffer is large enough to contain full request (hdr->length bytes) and
457 * that the EAP type is EAP_TYPE_TLV.
458 * @resp: Buffer to return a pointer to the allocated response message. This
459 * field should be initialized to %NULL before the call. The value will be
460 * updated if a response message is generated. The caller is responsible for
461 * freeing the allocated message.
462 * @force_failure: Force negotiation to fail
463 * Returns: 0 on success, -1 on failure
464 */
eap_tlv_process(struct eap_sm * sm,struct eap_peap_data * data,struct eap_method_ret * ret,const struct wpabuf * req,struct wpabuf ** resp,int force_failure)465 static int eap_tlv_process(struct eap_sm *sm, struct eap_peap_data *data,
466 struct eap_method_ret *ret,
467 const struct wpabuf *req, struct wpabuf **resp,
468 int force_failure)
469 {
470 size_t left, tlv_len;
471 const u8 *pos;
472 const u8 *result_tlv = NULL, *crypto_tlv = NULL;
473 size_t result_tlv_len = 0, crypto_tlv_len = 0;
474 int tlv_type, mandatory;
475
476 /* Parse TLVs */
477 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, req, &left);
478 if (pos == NULL)
479 return -1;
480 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Received TLVs", pos, left);
481 while (left >= 4) {
482 mandatory = !!(pos[0] & 0x80);
483 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
484 pos += 2;
485 tlv_len = WPA_GET_BE16(pos);
486 pos += 2;
487 left -= 4;
488 if (tlv_len > left) {
489 wpa_printf(MSG_DEBUG, "EAP-TLV: TLV underrun "
490 "(tlv_len=%lu left=%lu)",
491 (unsigned long) tlv_len,
492 (unsigned long) left);
493 return -1;
494 }
495 switch (tlv_type) {
496 case EAP_TLV_RESULT_TLV:
497 result_tlv = pos;
498 result_tlv_len = tlv_len;
499 break;
500 case EAP_TLV_CRYPTO_BINDING_TLV:
501 crypto_tlv = pos;
502 crypto_tlv_len = tlv_len;
503 break;
504 default:
505 wpa_printf(MSG_DEBUG, "EAP-TLV: Unsupported TLV Type "
506 "%d%s", tlv_type,
507 mandatory ? " (mandatory)" : "");
508 if (mandatory) {
509 /* NAK TLV and ignore all TLVs in this packet.
510 */
511 *resp = eap_tlv_build_nak(eap_get_id(req),
512 tlv_type);
513 return *resp == NULL ? -1 : 0;
514 }
515 /* Ignore this TLV, but process other TLVs */
516 break;
517 }
518
519 pos += tlv_len;
520 left -= tlv_len;
521 }
522 if (left) {
523 wpa_printf(MSG_DEBUG, "EAP-TLV: Last TLV too short in "
524 "Request (left=%lu)", (unsigned long) left);
525 return -1;
526 }
527
528 /* Process supported TLVs */
529 if (crypto_tlv && data->crypto_binding != NO_BINDING) {
530 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV",
531 crypto_tlv, crypto_tlv_len);
532 if (eap_tlv_validate_cryptobinding(sm, data, crypto_tlv - 4,
533 crypto_tlv_len + 4) < 0) {
534 if (result_tlv == NULL)
535 return -1;
536 force_failure = 1;
537 crypto_tlv = NULL; /* do not include Cryptobinding TLV
538 * in response, if the received
539 * cryptobinding was invalid. */
540 }
541 } else if (!crypto_tlv && data->crypto_binding == REQUIRE_BINDING) {
542 wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV");
543 return -1;
544 }
545
546 if (result_tlv) {
547 int status, resp_status;
548 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Result TLV",
549 result_tlv, result_tlv_len);
550 if (result_tlv_len < 2) {
551 wpa_printf(MSG_INFO, "EAP-TLV: Too short Result TLV "
552 "(len=%lu)",
553 (unsigned long) result_tlv_len);
554 return -1;
555 }
556 status = WPA_GET_BE16(result_tlv);
557 if (status == EAP_TLV_RESULT_SUCCESS) {
558 wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Success "
559 "- EAP-TLV/Phase2 Completed");
560 if (force_failure) {
561 wpa_printf(MSG_INFO, "EAP-TLV: Earlier failure"
562 " - force failed Phase 2");
563 resp_status = EAP_TLV_RESULT_FAILURE;
564 ret->decision = DECISION_FAIL;
565 } else {
566 resp_status = EAP_TLV_RESULT_SUCCESS;
567 ret->decision = DECISION_UNCOND_SUCC;
568 }
569 } else if (status == EAP_TLV_RESULT_FAILURE) {
570 wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Failure");
571 resp_status = EAP_TLV_RESULT_FAILURE;
572 ret->decision = DECISION_FAIL;
573 } else {
574 wpa_printf(MSG_INFO, "EAP-TLV: Unknown TLV Result "
575 "Status %d", status);
576 resp_status = EAP_TLV_RESULT_FAILURE;
577 ret->decision = DECISION_FAIL;
578 }
579 ret->methodState = METHOD_DONE;
580
581 *resp = eap_tlv_build_result(sm, data, crypto_tlv != NULL,
582 eap_get_id(req), resp_status);
583 }
584
585 return 0;
586 }
587
588
eap_peap_phase2_request(struct eap_sm * sm,struct eap_peap_data * data,struct eap_method_ret * ret,struct wpabuf * req,struct wpabuf ** resp)589 static int eap_peap_phase2_request(struct eap_sm *sm,
590 struct eap_peap_data *data,
591 struct eap_method_ret *ret,
592 struct wpabuf *req,
593 struct wpabuf **resp)
594 {
595 struct eap_hdr *hdr = wpabuf_mhead(req);
596 size_t len = be_to_host16(hdr->length);
597 u8 *pos;
598 struct eap_method_ret iret;
599 struct eap_peer_config *config = eap_get_config(sm);
600
601 if (len <= sizeof(struct eap_hdr)) {
602 wpa_printf(MSG_INFO, "EAP-PEAP: too short "
603 "Phase 2 request (len=%lu)", (unsigned long) len);
604 return -1;
605 }
606 pos = (u8 *) (hdr + 1);
607 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Request: type=%d", *pos);
608 switch (*pos) {
609 case EAP_TYPE_IDENTITY:
610 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
611 break;
612 case EAP_TYPE_TLV:
613 os_memset(&iret, 0, sizeof(iret));
614 if (eap_tlv_process(sm, data, &iret, req, resp,
615 data->phase2_eap_started &&
616 !data->phase2_eap_success)) {
617 ret->methodState = METHOD_DONE;
618 ret->decision = DECISION_FAIL;
619 return -1;
620 }
621 if (iret.methodState == METHOD_DONE ||
622 iret.methodState == METHOD_MAY_CONT) {
623 ret->methodState = iret.methodState;
624 ret->decision = iret.decision;
625 data->phase2_success = 1;
626 }
627 break;
628 case EAP_TYPE_EXPANDED:
629 #ifdef EAP_TNC
630 if (data->soh) {
631 const u8 *epos;
632 size_t eleft;
633
634 epos = eap_hdr_validate(EAP_VENDOR_MICROSOFT, 0x21,
635 req, &eleft);
636 if (epos) {
637 struct wpabuf *buf;
638 wpa_printf(MSG_DEBUG,
639 "EAP-PEAP: SoH EAP Extensions");
640 buf = tncc_process_soh_request(data->soh,
641 epos, eleft);
642 if (buf) {
643 *resp = eap_msg_alloc(
644 EAP_VENDOR_MICROSOFT, 0x21,
645 wpabuf_len(buf),
646 EAP_CODE_RESPONSE,
647 hdr->identifier);
648 if (*resp == NULL) {
649 ret->methodState = METHOD_DONE;
650 ret->decision = DECISION_FAIL;
651 return -1;
652 }
653 wpabuf_put_buf(*resp, buf);
654 wpabuf_free(buf);
655 break;
656 }
657 }
658 }
659 #endif /* EAP_TNC */
660 /* fall through */
661 default:
662 if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
663 data->phase2_type.method == EAP_TYPE_NONE) {
664 size_t i;
665 for (i = 0; i < data->num_phase2_types; i++) {
666 if (data->phase2_types[i].vendor !=
667 EAP_VENDOR_IETF ||
668 data->phase2_types[i].method != *pos)
669 continue;
670
671 data->phase2_type.vendor =
672 data->phase2_types[i].vendor;
673 data->phase2_type.method =
674 data->phase2_types[i].method;
675 wpa_printf(MSG_DEBUG, "EAP-PEAP: Selected "
676 "Phase 2 EAP vendor %d method %d",
677 data->phase2_type.vendor,
678 data->phase2_type.method);
679 break;
680 }
681 }
682 if (*pos != data->phase2_type.method ||
683 *pos == EAP_TYPE_NONE) {
684 if (eap_peer_tls_phase2_nak(data->phase2_types,
685 data->num_phase2_types,
686 hdr, resp))
687 return -1;
688 return 0;
689 }
690
691 if (data->phase2_priv == NULL) {
692 data->phase2_method = eap_peer_get_eap_method(
693 data->phase2_type.vendor,
694 data->phase2_type.method);
695 if (data->phase2_method) {
696 sm->init_phase2 = 1;
697 data->phase2_priv =
698 data->phase2_method->init(sm);
699 sm->init_phase2 = 0;
700 }
701 }
702 if (data->phase2_priv == NULL || data->phase2_method == NULL) {
703 wpa_printf(MSG_INFO, "EAP-PEAP: failed to initialize "
704 "Phase 2 EAP method %d", *pos);
705 ret->methodState = METHOD_DONE;
706 ret->decision = DECISION_FAIL;
707 return -1;
708 }
709 data->phase2_eap_started = 1;
710 os_memset(&iret, 0, sizeof(iret));
711 *resp = data->phase2_method->process(sm, data->phase2_priv,
712 &iret, req);
713 if ((iret.methodState == METHOD_DONE ||
714 iret.methodState == METHOD_MAY_CONT) &&
715 (iret.decision == DECISION_UNCOND_SUCC ||
716 iret.decision == DECISION_COND_SUCC)) {
717 data->phase2_eap_success = 1;
718 data->phase2_success = 1;
719 }
720 break;
721 }
722
723 if (*resp == NULL &&
724 (config->pending_req_identity || config->pending_req_password ||
725 config->pending_req_otp || config->pending_req_new_password)) {
726 wpabuf_free(data->pending_phase2_req);
727 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
728 }
729
730 return 0;
731 }
732
733
eap_peap_decrypt(struct eap_sm * sm,struct eap_peap_data * data,struct eap_method_ret * ret,const struct eap_hdr * req,const struct wpabuf * in_data,struct wpabuf ** out_data)734 static int eap_peap_decrypt(struct eap_sm *sm, struct eap_peap_data *data,
735 struct eap_method_ret *ret,
736 const struct eap_hdr *req,
737 const struct wpabuf *in_data,
738 struct wpabuf **out_data)
739 {
740 struct wpabuf *in_decrypted = NULL;
741 int res, skip_change = 0;
742 struct eap_hdr *hdr, *rhdr;
743 struct wpabuf *resp = NULL;
744 size_t len;
745
746 wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
747 " Phase 2", (unsigned long) wpabuf_len(in_data));
748
749 if (data->pending_phase2_req) {
750 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 request - "
751 "skip decryption and use old data");
752 /* Clear TLS reassembly state. */
753 eap_peer_tls_reset_input(&data->ssl);
754 in_decrypted = data->pending_phase2_req;
755 data->pending_phase2_req = NULL;
756 skip_change = 1;
757 goto continue_req;
758 }
759
760 if (wpabuf_len(in_data) == 0 && sm->workaround &&
761 data->phase2_success) {
762 /*
763 * Cisco ACS seems to be using TLS ACK to terminate
764 * EAP-PEAPv0/GTC. Try to reply with TLS ACK.
765 */
766 wpa_printf(MSG_DEBUG, "EAP-PEAP: Received TLS ACK, but "
767 "expected data - acknowledge with TLS ACK since "
768 "Phase 2 has been completed");
769 ret->decision = DECISION_COND_SUCC;
770 ret->methodState = METHOD_DONE;
771 return 1;
772 } else if (wpabuf_len(in_data) == 0) {
773 /* Received TLS ACK - requesting more fragments */
774 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
775 data->peap_version,
776 req->identifier, NULL, out_data);
777 }
778
779 res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
780 if (res)
781 return res;
782
783 continue_req:
784 wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP",
785 in_decrypted);
786
787 hdr = wpabuf_mhead(in_decrypted);
788 if (wpabuf_len(in_decrypted) == 5 && hdr->code == EAP_CODE_REQUEST &&
789 be_to_host16(hdr->length) == 5 &&
790 eap_get_type(in_decrypted) == EAP_TYPE_IDENTITY) {
791 /* At least FreeRADIUS seems to send full EAP header with
792 * EAP Request Identity */
793 skip_change = 1;
794 }
795 if (wpabuf_len(in_decrypted) >= 5 && hdr->code == EAP_CODE_REQUEST &&
796 eap_get_type(in_decrypted) == EAP_TYPE_TLV) {
797 skip_change = 1;
798 }
799
800 if (data->peap_version == 0 && !skip_change) {
801 struct eap_hdr *nhdr;
802 struct wpabuf *nmsg = wpabuf_alloc(sizeof(struct eap_hdr) +
803 wpabuf_len(in_decrypted));
804 if (nmsg == NULL) {
805 wpabuf_free(in_decrypted);
806 return 0;
807 }
808 nhdr = wpabuf_put(nmsg, sizeof(*nhdr));
809 wpabuf_put_buf(nmsg, in_decrypted);
810 nhdr->code = req->code;
811 nhdr->identifier = req->identifier;
812 nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
813 wpabuf_len(in_decrypted));
814
815 wpabuf_free(in_decrypted);
816 in_decrypted = nmsg;
817 }
818
819 hdr = wpabuf_mhead(in_decrypted);
820 if (wpabuf_len(in_decrypted) < sizeof(*hdr)) {
821 wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
822 "EAP frame (len=%lu)",
823 (unsigned long) wpabuf_len(in_decrypted));
824 wpabuf_free(in_decrypted);
825 return 0;
826 }
827 len = be_to_host16(hdr->length);
828 if (len > wpabuf_len(in_decrypted)) {
829 wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in "
830 "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
831 (unsigned long) wpabuf_len(in_decrypted),
832 (unsigned long) len);
833 wpabuf_free(in_decrypted);
834 return 0;
835 }
836 if (len < wpabuf_len(in_decrypted)) {
837 wpa_printf(MSG_INFO, "EAP-PEAP: Odd.. Phase 2 EAP header has "
838 "shorter length than full decrypted data "
839 "(%lu < %lu)",
840 (unsigned long) len,
841 (unsigned long) wpabuf_len(in_decrypted));
842 }
843 wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d "
844 "identifier=%d length=%lu", hdr->code, hdr->identifier,
845 (unsigned long) len);
846 switch (hdr->code) {
847 case EAP_CODE_REQUEST:
848 if (eap_peap_phase2_request(sm, data, ret, in_decrypted,
849 &resp)) {
850 wpabuf_free(in_decrypted);
851 wpa_printf(MSG_INFO, "EAP-PEAP: Phase2 Request "
852 "processing failed");
853 return 0;
854 }
855 break;
856 case EAP_CODE_SUCCESS:
857 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success");
858 if (data->peap_version == 1) {
859 /* EAP-Success within TLS tunnel is used to indicate
860 * shutdown of the TLS channel. The authentication has
861 * been completed. */
862 if (data->phase2_eap_started &&
863 !data->phase2_eap_success) {
864 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 "
865 "Success used to indicate success, "
866 "but Phase 2 EAP was not yet "
867 "completed successfully");
868 ret->methodState = METHOD_DONE;
869 ret->decision = DECISION_FAIL;
870 wpabuf_free(in_decrypted);
871 return 0;
872 }
873 wpa_printf(MSG_DEBUG, "EAP-PEAP: Version 1 - "
874 "EAP-Success within TLS tunnel - "
875 "authentication completed");
876 ret->decision = DECISION_UNCOND_SUCC;
877 ret->methodState = METHOD_DONE;
878 data->phase2_success = 1;
879 if (data->peap_outer_success == 2) {
880 wpabuf_free(in_decrypted);
881 wpa_printf(MSG_DEBUG, "EAP-PEAP: Use TLS ACK "
882 "to finish authentication");
883 return 1;
884 } else if (data->peap_outer_success == 1) {
885 /* Reply with EAP-Success within the TLS
886 * channel to complete the authentication. */
887 resp = wpabuf_alloc(sizeof(struct eap_hdr));
888 if (resp) {
889 rhdr = wpabuf_put(resp, sizeof(*rhdr));
890 rhdr->code = EAP_CODE_SUCCESS;
891 rhdr->identifier = hdr->identifier;
892 rhdr->length =
893 host_to_be16(sizeof(*rhdr));
894 }
895 } else {
896 /* No EAP-Success expected for Phase 1 (outer,
897 * unencrypted auth), so force EAP state
898 * machine to SUCCESS state. */
899 sm->peap_done = TRUE;
900 }
901 } else {
902 /* FIX: ? */
903 }
904 break;
905 case EAP_CODE_FAILURE:
906 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure");
907 ret->decision = DECISION_FAIL;
908 ret->methodState = METHOD_MAY_CONT;
909 ret->allowNotifications = FALSE;
910 /* Reply with EAP-Failure within the TLS channel to complete
911 * failure reporting. */
912 resp = wpabuf_alloc(sizeof(struct eap_hdr));
913 if (resp) {
914 rhdr = wpabuf_put(resp, sizeof(*rhdr));
915 rhdr->code = EAP_CODE_FAILURE;
916 rhdr->identifier = hdr->identifier;
917 rhdr->length = host_to_be16(sizeof(*rhdr));
918 }
919 break;
920 default:
921 wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
922 "Phase 2 EAP header", hdr->code);
923 break;
924 }
925
926 wpabuf_free(in_decrypted);
927
928 if (resp) {
929 int skip_change2 = 0;
930 struct wpabuf *rmsg, buf;
931
932 wpa_hexdump_buf_key(MSG_DEBUG,
933 "EAP-PEAP: Encrypting Phase 2 data", resp);
934 /* PEAP version changes */
935 if (wpabuf_len(resp) >= 5 &&
936 wpabuf_head_u8(resp)[0] == EAP_CODE_RESPONSE &&
937 eap_get_type(resp) == EAP_TYPE_TLV)
938 skip_change2 = 1;
939 rmsg = resp;
940 if (data->peap_version == 0 && !skip_change2) {
941 wpabuf_set(&buf, wpabuf_head_u8(resp) +
942 sizeof(struct eap_hdr),
943 wpabuf_len(resp) - sizeof(struct eap_hdr));
944 rmsg = &buf;
945 }
946
947 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
948 data->peap_version, req->identifier,
949 rmsg, out_data)) {
950 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to encrypt "
951 "a Phase 2 frame");
952 }
953 wpabuf_free(resp);
954 }
955
956 return 0;
957 }
958
959
eap_peap_process(struct eap_sm * sm,void * priv,struct eap_method_ret * ret,const struct wpabuf * reqData)960 static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv,
961 struct eap_method_ret *ret,
962 const struct wpabuf *reqData)
963 {
964 const struct eap_hdr *req;
965 size_t left;
966 int res;
967 u8 flags, id;
968 struct wpabuf *resp;
969 const u8 *pos;
970 struct eap_peap_data *data = priv;
971 struct wpabuf msg;
972
973 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_PEAP, ret,
974 reqData, &left, &flags);
975 if (pos == NULL)
976 return NULL;
977 req = wpabuf_head(reqData);
978 id = req->identifier;
979
980 if (flags & EAP_TLS_FLAGS_START) {
981 wpa_printf(MSG_DEBUG, "EAP-PEAP: Start (server ver=%d, own "
982 "ver=%d)", flags & EAP_TLS_VERSION_MASK,
983 data->peap_version);
984 if ((flags & EAP_TLS_VERSION_MASK) < data->peap_version)
985 data->peap_version = flags & EAP_TLS_VERSION_MASK;
986 if (data->force_peap_version >= 0 &&
987 data->force_peap_version != data->peap_version) {
988 wpa_printf(MSG_WARNING, "EAP-PEAP: Failed to select "
989 "forced PEAP version %d",
990 data->force_peap_version);
991 ret->methodState = METHOD_DONE;
992 ret->decision = DECISION_FAIL;
993 ret->allowNotifications = FALSE;
994 return NULL;
995 }
996 wpa_printf(MSG_DEBUG, "EAP-PEAP: Using PEAP version %d",
997 data->peap_version);
998 left = 0; /* make sure that this frame is empty, even though it
999 * should always be, anyway */
1000 }
1001
1002 wpabuf_set(&msg, pos, left);
1003
1004 resp = NULL;
1005 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1006 !data->resuming) {
1007 res = eap_peap_decrypt(sm, data, ret, req, &msg, &resp);
1008 } else {
1009 res = eap_peer_tls_process_helper(sm, &data->ssl,
1010 EAP_TYPE_PEAP,
1011 data->peap_version, id, &msg,
1012 &resp);
1013
1014 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1015 char *label;
1016 wpa_printf(MSG_DEBUG,
1017 "EAP-PEAP: TLS done, proceed to Phase 2");
1018 eap_peap_free_key(data);
1019 /* draft-josefsson-ppext-eap-tls-eap-05.txt
1020 * specifies that PEAPv1 would use "client PEAP
1021 * encryption" as the label. However, most existing
1022 * PEAPv1 implementations seem to be using the old
1023 * label, "client EAP encryption", instead. Use the old
1024 * label by default, but allow it to be configured with
1025 * phase1 parameter peaplabel=1. */
1026 if (data->force_new_label)
1027 label = "client PEAP encryption";
1028 else
1029 label = "client EAP encryption";
1030 wpa_printf(MSG_DEBUG, "EAP-PEAP: using label '%s' in "
1031 "key derivation", label);
1032 data->key_data =
1033 eap_peer_tls_derive_key(sm, &data->ssl, label,
1034 EAP_TLS_KEY_LEN);
1035 if (data->key_data) {
1036 wpa_hexdump_key(MSG_DEBUG,
1037 "EAP-PEAP: Derived key",
1038 data->key_data,
1039 EAP_TLS_KEY_LEN);
1040 } else {
1041 wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to "
1042 "derive key");
1043 }
1044
1045 os_free(data->session_id);
1046 data->session_id =
1047 eap_peer_tls_derive_session_id(sm, &data->ssl,
1048 EAP_TYPE_PEAP,
1049 &data->id_len);
1050 if (data->session_id) {
1051 wpa_hexdump(MSG_DEBUG,
1052 "EAP-PEAP: Derived Session-Id",
1053 data->session_id, data->id_len);
1054 } else {
1055 wpa_printf(MSG_ERROR, "EAP-PEAP: Failed to "
1056 "derive Session-Id");
1057 }
1058
1059 if (sm->workaround && data->resuming) {
1060 /*
1061 * At least few RADIUS servers (Aegis v1.1.6;
1062 * but not v1.1.4; and Cisco ACS) seem to be
1063 * terminating PEAPv1 (Aegis) or PEAPv0 (Cisco
1064 * ACS) session resumption with outer
1065 * EAP-Success. This does not seem to follow
1066 * draft-josefsson-pppext-eap-tls-eap-05.txt
1067 * section 4.2, so only allow this if EAP
1068 * workarounds are enabled.
1069 */
1070 wpa_printf(MSG_DEBUG, "EAP-PEAP: Workaround - "
1071 "allow outer EAP-Success to "
1072 "terminate PEAP resumption");
1073 ret->decision = DECISION_COND_SUCC;
1074 data->phase2_success = 1;
1075 }
1076
1077 data->resuming = 0;
1078 }
1079
1080 if (res == 2) {
1081 /*
1082 * Application data included in the handshake message.
1083 */
1084 wpabuf_free(data->pending_phase2_req);
1085 data->pending_phase2_req = resp;
1086 resp = NULL;
1087 res = eap_peap_decrypt(sm, data, ret, req, &msg,
1088 &resp);
1089 }
1090 }
1091
1092 if (ret->methodState == METHOD_DONE) {
1093 ret->allowNotifications = FALSE;
1094 }
1095
1096 if (res == 1) {
1097 wpabuf_free(resp);
1098 return eap_peer_tls_build_ack(id, EAP_TYPE_PEAP,
1099 data->peap_version);
1100 }
1101
1102 return resp;
1103 }
1104
1105
eap_peap_has_reauth_data(struct eap_sm * sm,void * priv)1106 static Boolean eap_peap_has_reauth_data(struct eap_sm *sm, void *priv)
1107 {
1108 struct eap_peap_data *data = priv;
1109 return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1110 data->phase2_success;
1111 }
1112
1113
eap_peap_deinit_for_reauth(struct eap_sm * sm,void * priv)1114 static void eap_peap_deinit_for_reauth(struct eap_sm *sm, void *priv)
1115 {
1116 struct eap_peap_data *data = priv;
1117 wpabuf_free(data->pending_phase2_req);
1118 data->pending_phase2_req = NULL;
1119 data->crypto_binding_used = 0;
1120 }
1121
1122
eap_peap_init_for_reauth(struct eap_sm * sm,void * priv)1123 static void * eap_peap_init_for_reauth(struct eap_sm *sm, void *priv)
1124 {
1125 struct eap_peap_data *data = priv;
1126 eap_peap_free_key(data);
1127 os_free(data->session_id);
1128 data->session_id = NULL;
1129 if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1130 os_free(data);
1131 return NULL;
1132 }
1133 if (data->phase2_priv && data->phase2_method &&
1134 data->phase2_method->init_for_reauth)
1135 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1136 data->phase2_success = 0;
1137 data->phase2_eap_success = 0;
1138 data->phase2_eap_started = 0;
1139 data->resuming = 1;
1140 data->reauth = 1;
1141 sm->peap_done = FALSE;
1142 return priv;
1143 }
1144
1145
eap_peap_get_status(struct eap_sm * sm,void * priv,char * buf,size_t buflen,int verbose)1146 static int eap_peap_get_status(struct eap_sm *sm, void *priv, char *buf,
1147 size_t buflen, int verbose)
1148 {
1149 struct eap_peap_data *data = priv;
1150 int len, ret;
1151
1152 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1153 if (data->phase2_method) {
1154 ret = os_snprintf(buf + len, buflen - len,
1155 "EAP-PEAPv%d Phase2 method=%s\n",
1156 data->peap_version,
1157 data->phase2_method->name);
1158 if (os_snprintf_error(buflen - len, ret))
1159 return len;
1160 len += ret;
1161 }
1162 return len;
1163 }
1164
1165
eap_peap_isKeyAvailable(struct eap_sm * sm,void * priv)1166 static Boolean eap_peap_isKeyAvailable(struct eap_sm *sm, void *priv)
1167 {
1168 struct eap_peap_data *data = priv;
1169 return data->key_data != NULL && data->phase2_success;
1170 }
1171
1172
eap_peap_getKey(struct eap_sm * sm,void * priv,size_t * len)1173 static u8 * eap_peap_getKey(struct eap_sm *sm, void *priv, size_t *len)
1174 {
1175 struct eap_peap_data *data = priv;
1176 u8 *key;
1177
1178 if (data->key_data == NULL || !data->phase2_success)
1179 return NULL;
1180
1181 key = os_malloc(EAP_TLS_KEY_LEN);
1182 if (key == NULL)
1183 return NULL;
1184
1185 *len = EAP_TLS_KEY_LEN;
1186
1187 if (data->crypto_binding_used) {
1188 u8 csk[128];
1189 /*
1190 * Note: It looks like Microsoft implementation requires null
1191 * termination for this label while the one used for deriving
1192 * IPMK|CMK did not use null termination.
1193 */
1194 if (peap_prfplus(data->peap_version, data->ipmk, 40,
1195 "Session Key Generating Function",
1196 (u8 *) "\00", 1, csk, sizeof(csk)) < 0) {
1197 os_free(key);
1198 return NULL;
1199 }
1200 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk));
1201 os_memcpy(key, csk, EAP_TLS_KEY_LEN);
1202 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
1203 key, EAP_TLS_KEY_LEN);
1204 } else
1205 os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
1206
1207 return key;
1208 }
1209
1210
eap_peap_get_session_id(struct eap_sm * sm,void * priv,size_t * len)1211 static u8 * eap_peap_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1212 {
1213 struct eap_peap_data *data = priv;
1214 u8 *id;
1215
1216 if (data->session_id == NULL || !data->phase2_success)
1217 return NULL;
1218
1219 id = os_malloc(data->id_len);
1220 if (id == NULL)
1221 return NULL;
1222
1223 *len = data->id_len;
1224 os_memcpy(id, data->session_id, data->id_len);
1225
1226 return id;
1227 }
1228
1229
eap_peer_peap_register(void)1230 int eap_peer_peap_register(void)
1231 {
1232 struct eap_method *eap;
1233 int ret;
1234
1235 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1236 EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP");
1237 if (eap == NULL)
1238 return -1;
1239
1240 eap->init = eap_peap_init;
1241 eap->deinit = eap_peap_deinit;
1242 eap->process = eap_peap_process;
1243 eap->isKeyAvailable = eap_peap_isKeyAvailable;
1244 eap->getKey = eap_peap_getKey;
1245 eap->get_status = eap_peap_get_status;
1246 eap->has_reauth_data = eap_peap_has_reauth_data;
1247 eap->deinit_for_reauth = eap_peap_deinit_for_reauth;
1248 eap->init_for_reauth = eap_peap_init_for_reauth;
1249 eap->getSessionId = eap_peap_get_session_id;
1250
1251 ret = eap_peer_method_register(eap);
1252 if (ret)
1253 eap_peer_method_free(eap);
1254 return ret;
1255 }
1256