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 * 2 = draft-josefsson-ppext-eap-tls-eap-10.txt
26 */
27 #define EAP_PEAP_VERSION 1
28
29
30 static void eap_peap_deinit(struct eap_sm *sm, void *priv);
31
32
33 struct eap_peap_data {
34 struct eap_ssl_data ssl;
35
36 int peap_version, force_peap_version, force_new_label;
37
38 const struct eap_method *phase2_method;
39 void *phase2_priv;
40 int phase2_success;
41 int phase2_eap_success;
42 int phase2_eap_started;
43
44 struct eap_method_type phase2_type;
45 struct eap_method_type *phase2_types;
46 size_t num_phase2_types;
47
48 int peap_outer_success; /* 0 = PEAP terminated on Phase 2 inner
49 * EAP-Success
50 * 1 = reply with tunneled EAP-Success to inner
51 * EAP-Success and expect AS to send outer
52 * (unencrypted) EAP-Success after this
53 * 2 = reply with PEAP/TLS ACK to inner
54 * EAP-Success and expect AS to send outer
55 * (unencrypted) EAP-Success after this */
56 int resuming; /* starting a resumed session */
57 int reauth; /* reauthentication */
58 u8 *key_data;
59
60 struct wpabuf *pending_phase2_req;
61 enum { NO_BINDING, OPTIONAL_BINDING, REQUIRE_BINDING } crypto_binding;
62 int crypto_binding_used;
63 u8 binding_nonce[32];
64 u8 ipmk[40];
65 u8 cmk[20];
66 int soh; /* Whether IF-TNCCS-SOH (Statement of Health; Microsoft NAP)
67 * is enabled. */
68 };
69
70
eap_peap_parse_phase1(struct eap_peap_data * data,const char * phase1)71 static int eap_peap_parse_phase1(struct eap_peap_data *data,
72 const char *phase1)
73 {
74 const char *pos;
75
76 pos = os_strstr(phase1, "peapver=");
77 if (pos) {
78 data->force_peap_version = atoi(pos + 8);
79 data->peap_version = data->force_peap_version;
80 wpa_printf(MSG_DEBUG, "EAP-PEAP: Forced PEAP version %d",
81 data->force_peap_version);
82 }
83
84 if (os_strstr(phase1, "peaplabel=1")) {
85 data->force_new_label = 1;
86 wpa_printf(MSG_DEBUG, "EAP-PEAP: Force new label for key "
87 "derivation");
88 }
89
90 if (os_strstr(phase1, "peap_outer_success=0")) {
91 data->peap_outer_success = 0;
92 wpa_printf(MSG_DEBUG, "EAP-PEAP: terminate authentication on "
93 "tunneled EAP-Success");
94 } else if (os_strstr(phase1, "peap_outer_success=1")) {
95 data->peap_outer_success = 1;
96 wpa_printf(MSG_DEBUG, "EAP-PEAP: send tunneled EAP-Success "
97 "after receiving tunneled EAP-Success");
98 } else if (os_strstr(phase1, "peap_outer_success=2")) {
99 data->peap_outer_success = 2;
100 wpa_printf(MSG_DEBUG, "EAP-PEAP: send PEAP/TLS ACK after "
101 "receiving tunneled EAP-Success");
102 }
103
104 if (os_strstr(phase1, "crypto_binding=0")) {
105 data->crypto_binding = NO_BINDING;
106 wpa_printf(MSG_DEBUG, "EAP-PEAP: Do not use cryptobinding");
107 } else if (os_strstr(phase1, "crypto_binding=1")) {
108 data->crypto_binding = OPTIONAL_BINDING;
109 wpa_printf(MSG_DEBUG, "EAP-PEAP: Optional cryptobinding");
110 } else if (os_strstr(phase1, "crypto_binding=2")) {
111 data->crypto_binding = REQUIRE_BINDING;
112 wpa_printf(MSG_DEBUG, "EAP-PEAP: Require cryptobinding");
113 }
114
115 #ifdef EAP_TNC
116 if (os_strstr(phase1, "tnc=soh2")) {
117 data->soh = 2;
118 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled");
119 } else if (os_strstr(phase1, "tnc=soh1")) {
120 data->soh = 1;
121 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 1 enabled");
122 } else if (os_strstr(phase1, "tnc=soh")) {
123 data->soh = 2;
124 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled");
125 }
126 #endif /* EAP_TNC */
127
128 return 0;
129 }
130
131
eap_peap_init(struct eap_sm * sm)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) < 0) {
148 eap_peap_deinit(sm, data);
149 return NULL;
150 }
151
152 if (eap_peer_select_phase2_methods(config, "auth=",
153 &data->phase2_types,
154 &data->num_phase2_types) < 0) {
155 eap_peap_deinit(sm, data);
156 return NULL;
157 }
158
159 data->phase2_type.vendor = EAP_VENDOR_IETF;
160 data->phase2_type.method = EAP_TYPE_NONE;
161
162 if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_PEAP)) {
163 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to initialize SSL.");
164 eap_peap_deinit(sm, data);
165 return NULL;
166 }
167
168 return data;
169 }
170
171
eap_peap_deinit(struct eap_sm * sm,void * priv)172 static void eap_peap_deinit(struct eap_sm *sm, void *priv)
173 {
174 struct eap_peap_data *data = priv;
175 if (data == NULL)
176 return;
177 if (data->phase2_priv && data->phase2_method)
178 data->phase2_method->deinit(sm, data->phase2_priv);
179 os_free(data->phase2_types);
180 eap_peer_tls_ssl_deinit(sm, &data->ssl);
181 os_free(data->key_data);
182 wpabuf_free(data->pending_phase2_req);
183 os_free(data);
184 }
185
186
187 /**
188 * eap_tlv_build_nak - Build EAP-TLV NAK message
189 * @id: EAP identifier for the header
190 * @nak_type: TLV type (EAP_TLV_*)
191 * Returns: Buffer to the allocated EAP-TLV NAK message or %NULL on failure
192 *
193 * This function builds an EAP-TLV NAK message. The caller is responsible for
194 * freeing the returned buffer.
195 */
eap_tlv_build_nak(int id,u16 nak_type)196 static struct wpabuf * eap_tlv_build_nak(int id, u16 nak_type)
197 {
198 struct wpabuf *msg;
199
200 msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, 10,
201 EAP_CODE_RESPONSE, id);
202 if (msg == NULL)
203 return NULL;
204
205 wpabuf_put_u8(msg, 0x80); /* Mandatory */
206 wpabuf_put_u8(msg, EAP_TLV_NAK_TLV);
207 wpabuf_put_be16(msg, 6); /* Length */
208 wpabuf_put_be32(msg, 0); /* Vendor-Id */
209 wpabuf_put_be16(msg, nak_type); /* NAK-Type */
210
211 return msg;
212 }
213
214
eap_peap_get_isk(struct eap_sm * sm,struct eap_peap_data * data,u8 * isk,size_t isk_len)215 static int eap_peap_get_isk(struct eap_sm *sm, struct eap_peap_data *data,
216 u8 *isk, size_t isk_len)
217 {
218 u8 *key;
219 size_t key_len;
220
221 os_memset(isk, 0, isk_len);
222 if (data->phase2_method == NULL || data->phase2_priv == NULL ||
223 data->phase2_method->isKeyAvailable == NULL ||
224 data->phase2_method->getKey == NULL)
225 return 0;
226
227 if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
228 (key = data->phase2_method->getKey(sm, data->phase2_priv,
229 &key_len)) == NULL) {
230 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not get key material "
231 "from Phase 2");
232 return -1;
233 }
234
235 if (key_len > isk_len)
236 key_len = isk_len;
237 os_memcpy(isk, key, key_len);
238 os_free(key);
239
240 return 0;
241 }
242
243
eap_peap_derive_cmk(struct eap_sm * sm,struct eap_peap_data * data)244 static int eap_peap_derive_cmk(struct eap_sm *sm, struct eap_peap_data *data)
245 {
246 u8 *tk;
247 u8 isk[32], imck[60];
248
249 /*
250 * Tunnel key (TK) is the first 60 octets of the key generated by
251 * phase 1 of PEAP (based on TLS).
252 */
253 tk = data->key_data;
254 if (tk == NULL)
255 return -1;
256 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TK", tk, 60);
257
258 if (data->reauth &&
259 tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) {
260 /* Fast-connect: IPMK|CMK = TK */
261 os_memcpy(data->ipmk, tk, 40);
262 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK from TK",
263 data->ipmk, 40);
264 os_memcpy(data->cmk, tk + 40, 20);
265 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK from TK",
266 data->cmk, 20);
267 return 0;
268 }
269
270 if (eap_peap_get_isk(sm, data, isk, sizeof(isk)) < 0)
271 return -1;
272 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: ISK", isk, sizeof(isk));
273
274 /*
275 * IPMK Seed = "Inner Methods Compound Keys" | ISK
276 * TempKey = First 40 octets of TK
277 * IPMK|CMK = PRF+(TempKey, IPMK Seed, 60)
278 * (note: draft-josefsson-pppext-eap-tls-eap-10.txt includes a space
279 * in the end of the label just before ISK; is that just a typo?)
280 */
281 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TempKey", tk, 40);
282 if (peap_prfplus(data->peap_version, tk, 40,
283 "Inner Methods Compound Keys",
284 isk, sizeof(isk), imck, sizeof(imck)) < 0)
285 return -1;
286 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IMCK (IPMKj)",
287 imck, sizeof(imck));
288
289 os_memcpy(data->ipmk, imck, 40);
290 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK (S-IPMKj)", data->ipmk, 40);
291 os_memcpy(data->cmk, imck + 40, 20);
292 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK (CMKj)", data->cmk, 20);
293
294 return 0;
295 }
296
297
eap_tlv_add_cryptobinding(struct eap_sm * sm,struct eap_peap_data * data,struct wpabuf * buf)298 static int eap_tlv_add_cryptobinding(struct eap_sm *sm,
299 struct eap_peap_data *data,
300 struct wpabuf *buf)
301 {
302 u8 *mac;
303 u8 eap_type = EAP_TYPE_PEAP;
304 const u8 *addr[2];
305 size_t len[2];
306 u16 tlv_type;
307
308 /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
309 addr[0] = wpabuf_put(buf, 0);
310 len[0] = 60;
311 addr[1] = &eap_type;
312 len[1] = 1;
313
314 tlv_type = EAP_TLV_CRYPTO_BINDING_TLV;
315 if (data->peap_version >= 2)
316 tlv_type |= EAP_TLV_TYPE_MANDATORY;
317 wpabuf_put_be16(buf, tlv_type);
318 wpabuf_put_be16(buf, 56);
319
320 wpabuf_put_u8(buf, 0); /* Reserved */
321 wpabuf_put_u8(buf, data->peap_version); /* Version */
322 wpabuf_put_u8(buf, data->peap_version); /* RecvVersion */
323 wpabuf_put_u8(buf, 1); /* SubType: 0 = Request, 1 = Response */
324 wpabuf_put_data(buf, data->binding_nonce, 32); /* Nonce */
325 mac = wpabuf_put(buf, 20); /* Compound_MAC */
326 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC CMK", data->cmk, 20);
327 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 1",
328 addr[0], len[0]);
329 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 2",
330 addr[1], len[1]);
331 hmac_sha1_vector(data->cmk, 20, 2, addr, len, mac);
332 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC", mac, SHA1_MAC_LEN);
333 data->crypto_binding_used = 1;
334
335 return 0;
336 }
337
338
339 /**
340 * eap_tlv_build_result - Build EAP-TLV Result message
341 * @id: EAP identifier for the header
342 * @status: Status (EAP_TLV_RESULT_SUCCESS or EAP_TLV_RESULT_FAILURE)
343 * Returns: Buffer to the allocated EAP-TLV Result message or %NULL on failure
344 *
345 * This function builds an EAP-TLV Result message. The caller is responsible
346 * for freeing the returned buffer.
347 */
eap_tlv_build_result(struct eap_sm * sm,struct eap_peap_data * data,int crypto_tlv_used,int id,u16 status)348 static struct wpabuf * eap_tlv_build_result(struct eap_sm *sm,
349 struct eap_peap_data *data,
350 int crypto_tlv_used,
351 int id, u16 status)
352 {
353 struct wpabuf *msg;
354 size_t len;
355
356 if (data->crypto_binding == NO_BINDING)
357 crypto_tlv_used = 0;
358
359 len = 6;
360 if (crypto_tlv_used)
361 len += 60; /* Cryptobinding TLV */
362 msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, len,
363 EAP_CODE_RESPONSE, id);
364 if (msg == NULL)
365 return NULL;
366
367 wpabuf_put_u8(msg, 0x80); /* Mandatory */
368 wpabuf_put_u8(msg, EAP_TLV_RESULT_TLV);
369 wpabuf_put_be16(msg, 2); /* Length */
370 wpabuf_put_be16(msg, status); /* Status */
371
372 if (crypto_tlv_used && eap_tlv_add_cryptobinding(sm, data, msg)) {
373 wpabuf_free(msg);
374 return NULL;
375 }
376
377 return msg;
378 }
379
380
eap_tlv_validate_cryptobinding(struct eap_sm * sm,struct eap_peap_data * data,const u8 * crypto_tlv,size_t crypto_tlv_len)381 static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
382 struct eap_peap_data *data,
383 const u8 *crypto_tlv,
384 size_t crypto_tlv_len)
385 {
386 u8 buf[61], mac[SHA1_MAC_LEN];
387 const u8 *pos;
388
389 if (eap_peap_derive_cmk(sm, data) < 0) {
390 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not derive CMK");
391 return -1;
392 }
393
394 if (crypto_tlv_len != 4 + 56) {
395 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid cryptobinding TLV "
396 "length %d", (int) crypto_tlv_len);
397 return -1;
398 }
399
400 pos = crypto_tlv;
401 pos += 4; /* TLV header */
402 if (pos[1] != data->peap_version) {
403 wpa_printf(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV Version "
404 "mismatch (was %d; expected %d)",
405 pos[1], data->peap_version);
406 return -1;
407 }
408
409 if (pos[3] != 0) {
410 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV "
411 "SubType %d", pos[3]);
412 return -1;
413 }
414 pos += 4;
415 os_memcpy(data->binding_nonce, pos, 32);
416 pos += 32; /* Nonce */
417
418 /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
419 os_memcpy(buf, crypto_tlv, 60);
420 os_memset(buf + 4 + 4 + 32, 0, 20); /* Compound_MAC */
421 buf[60] = EAP_TYPE_PEAP;
422 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Compound_MAC data",
423 buf, sizeof(buf));
424 hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);
425
426 if (os_memcmp(mac, pos, SHA1_MAC_LEN) != 0) {
427 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
428 "cryptobinding TLV");
429 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received MAC",
430 pos, SHA1_MAC_LEN);
431 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Expected MAC",
432 mac, SHA1_MAC_LEN);
433 return -1;
434 }
435
436 wpa_printf(MSG_DEBUG, "EAP-PEAP: Valid cryptobinding TLV received");
437
438 return 0;
439 }
440
441
442 /**
443 * eap_tlv_process - Process a received EAP-TLV message and generate a response
444 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
445 * @ret: Return values from EAP request validation and processing
446 * @req: EAP-TLV request to be processed. The caller must have validated that
447 * the buffer is large enough to contain full request (hdr->length bytes) and
448 * that the EAP type is EAP_TYPE_TLV.
449 * @resp: Buffer to return a pointer to the allocated response message. This
450 * field should be initialized to %NULL before the call. The value will be
451 * updated if a response message is generated. The caller is responsible for
452 * freeing the allocated message.
453 * @force_failure: Force negotiation to fail
454 * Returns: 0 on success, -1 on failure
455 */
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)456 static int eap_tlv_process(struct eap_sm *sm, struct eap_peap_data *data,
457 struct eap_method_ret *ret,
458 const struct wpabuf *req, struct wpabuf **resp,
459 int force_failure)
460 {
461 size_t left, tlv_len;
462 const u8 *pos;
463 const u8 *result_tlv = NULL, *crypto_tlv = NULL;
464 size_t result_tlv_len = 0, crypto_tlv_len = 0;
465 int tlv_type, mandatory;
466
467 /* Parse TLVs */
468 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, req, &left);
469 if (pos == NULL)
470 return -1;
471 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Received TLVs", pos, left);
472 while (left >= 4) {
473 mandatory = !!(pos[0] & 0x80);
474 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
475 pos += 2;
476 tlv_len = WPA_GET_BE16(pos);
477 pos += 2;
478 left -= 4;
479 if (tlv_len > left) {
480 wpa_printf(MSG_DEBUG, "EAP-TLV: TLV underrun "
481 "(tlv_len=%lu left=%lu)",
482 (unsigned long) tlv_len,
483 (unsigned long) left);
484 return -1;
485 }
486 switch (tlv_type) {
487 case EAP_TLV_RESULT_TLV:
488 result_tlv = pos;
489 result_tlv_len = tlv_len;
490 break;
491 case EAP_TLV_CRYPTO_BINDING_TLV:
492 crypto_tlv = pos;
493 crypto_tlv_len = tlv_len;
494 break;
495 default:
496 wpa_printf(MSG_DEBUG, "EAP-TLV: Unsupported TLV Type "
497 "%d%s", tlv_type,
498 mandatory ? " (mandatory)" : "");
499 if (mandatory) {
500 /* NAK TLV and ignore all TLVs in this packet.
501 */
502 *resp = eap_tlv_build_nak(eap_get_id(req),
503 tlv_type);
504 return *resp == NULL ? -1 : 0;
505 }
506 /* Ignore this TLV, but process other TLVs */
507 break;
508 }
509
510 pos += tlv_len;
511 left -= tlv_len;
512 }
513 if (left) {
514 wpa_printf(MSG_DEBUG, "EAP-TLV: Last TLV too short in "
515 "Request (left=%lu)", (unsigned long) left);
516 return -1;
517 }
518
519 /* Process supported TLVs */
520 if (crypto_tlv && data->crypto_binding != NO_BINDING) {
521 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV",
522 crypto_tlv, crypto_tlv_len);
523 if (eap_tlv_validate_cryptobinding(sm, data, crypto_tlv - 4,
524 crypto_tlv_len + 4) < 0) {
525 if (result_tlv == NULL)
526 return -1;
527 force_failure = 1;
528 crypto_tlv = NULL; /* do not include Cryptobinding TLV
529 * in response, if the received
530 * cryptobinding was invalid. */
531 }
532 } else if (!crypto_tlv && data->crypto_binding == REQUIRE_BINDING) {
533 wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV");
534 return -1;
535 }
536
537 if (result_tlv) {
538 int status, resp_status;
539 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Result TLV",
540 result_tlv, result_tlv_len);
541 if (result_tlv_len < 2) {
542 wpa_printf(MSG_INFO, "EAP-TLV: Too short Result TLV "
543 "(len=%lu)",
544 (unsigned long) result_tlv_len);
545 return -1;
546 }
547 status = WPA_GET_BE16(result_tlv);
548 if (status == EAP_TLV_RESULT_SUCCESS) {
549 wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Success "
550 "- EAP-TLV/Phase2 Completed");
551 if (force_failure) {
552 wpa_printf(MSG_INFO, "EAP-TLV: Earlier failure"
553 " - force failed Phase 2");
554 resp_status = EAP_TLV_RESULT_FAILURE;
555 ret->decision = DECISION_FAIL;
556 } else {
557 resp_status = EAP_TLV_RESULT_SUCCESS;
558 ret->decision = DECISION_UNCOND_SUCC;
559 }
560 } else if (status == EAP_TLV_RESULT_FAILURE) {
561 wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Failure");
562 resp_status = EAP_TLV_RESULT_FAILURE;
563 ret->decision = DECISION_FAIL;
564 } else {
565 wpa_printf(MSG_INFO, "EAP-TLV: Unknown TLV Result "
566 "Status %d", status);
567 resp_status = EAP_TLV_RESULT_FAILURE;
568 ret->decision = DECISION_FAIL;
569 }
570 ret->methodState = METHOD_DONE;
571
572 *resp = eap_tlv_build_result(sm, data, crypto_tlv != NULL,
573 eap_get_id(req), resp_status);
574 }
575
576 return 0;
577 }
578
579
eap_peapv2_tlv_eap_payload(struct wpabuf * buf)580 static struct wpabuf * eap_peapv2_tlv_eap_payload(struct wpabuf *buf)
581 {
582 struct wpabuf *e;
583 struct eap_tlv_hdr *tlv;
584
585 if (buf == NULL)
586 return NULL;
587
588 /* Encapsulate EAP packet in EAP-Payload TLV */
589 wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Add EAP-Payload TLV");
590 e = wpabuf_alloc(sizeof(*tlv) + wpabuf_len(buf));
591 if (e == NULL) {
592 wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Failed to allocate memory "
593 "for TLV encapsulation");
594 wpabuf_free(buf);
595 return NULL;
596 }
597 tlv = wpabuf_put(e, sizeof(*tlv));
598 tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
599 EAP_TLV_EAP_PAYLOAD_TLV);
600 tlv->length = host_to_be16(wpabuf_len(buf));
601 wpabuf_put_buf(e, buf);
602 wpabuf_free(buf);
603 return e;
604 }
605
606
eap_peap_phase2_request(struct eap_sm * sm,struct eap_peap_data * data,struct eap_method_ret * ret,struct wpabuf * req,struct wpabuf ** resp)607 static int eap_peap_phase2_request(struct eap_sm *sm,
608 struct eap_peap_data *data,
609 struct eap_method_ret *ret,
610 struct wpabuf *req,
611 struct wpabuf **resp)
612 {
613 struct eap_hdr *hdr = wpabuf_mhead(req);
614 size_t len = be_to_host16(hdr->length);
615 u8 *pos;
616 struct eap_method_ret iret;
617 struct eap_peer_config *config = eap_get_config(sm);
618
619 if (len <= sizeof(struct eap_hdr)) {
620 wpa_printf(MSG_INFO, "EAP-PEAP: too short "
621 "Phase 2 request (len=%lu)", (unsigned long) len);
622 return -1;
623 }
624 pos = (u8 *) (hdr + 1);
625 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Request: type=%d", *pos);
626 switch (*pos) {
627 case EAP_TYPE_IDENTITY:
628 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
629 break;
630 case EAP_TYPE_TLV:
631 os_memset(&iret, 0, sizeof(iret));
632 if (eap_tlv_process(sm, data, &iret, req, resp,
633 data->phase2_eap_started &&
634 !data->phase2_eap_success)) {
635 ret->methodState = METHOD_DONE;
636 ret->decision = DECISION_FAIL;
637 return -1;
638 }
639 if (iret.methodState == METHOD_DONE ||
640 iret.methodState == METHOD_MAY_CONT) {
641 ret->methodState = iret.methodState;
642 ret->decision = iret.decision;
643 data->phase2_success = 1;
644 }
645 break;
646 case EAP_TYPE_EXPANDED:
647 #ifdef EAP_TNC
648 if (data->soh) {
649 const u8 *epos;
650 size_t eleft;
651
652 epos = eap_hdr_validate(EAP_VENDOR_MICROSOFT, 0x21,
653 req, &eleft);
654 if (epos) {
655 struct wpabuf *buf;
656 wpa_printf(MSG_DEBUG,
657 "EAP-PEAP: SoH EAP Extensions");
658 buf = tncc_process_soh_request(data->soh,
659 epos, eleft);
660 if (buf) {
661 *resp = eap_msg_alloc(
662 EAP_VENDOR_MICROSOFT, 0x21,
663 wpabuf_len(buf),
664 EAP_CODE_RESPONSE,
665 hdr->identifier);
666 if (*resp == NULL) {
667 ret->methodState = METHOD_DONE;
668 ret->decision = DECISION_FAIL;
669 return -1;
670 }
671 wpabuf_put_buf(*resp, buf);
672 wpabuf_free(buf);
673 break;
674 }
675 }
676 }
677 #endif /* EAP_TNC */
678 /* fall through */
679 default:
680 if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
681 data->phase2_type.method == EAP_TYPE_NONE) {
682 size_t i;
683 for (i = 0; i < data->num_phase2_types; i++) {
684 if (data->phase2_types[i].vendor !=
685 EAP_VENDOR_IETF ||
686 data->phase2_types[i].method != *pos)
687 continue;
688
689 data->phase2_type.vendor =
690 data->phase2_types[i].vendor;
691 data->phase2_type.method =
692 data->phase2_types[i].method;
693 wpa_printf(MSG_DEBUG, "EAP-PEAP: Selected "
694 "Phase 2 EAP vendor %d method %d",
695 data->phase2_type.vendor,
696 data->phase2_type.method);
697 break;
698 }
699 }
700 if (*pos != data->phase2_type.method ||
701 *pos == EAP_TYPE_NONE) {
702 if (eap_peer_tls_phase2_nak(data->phase2_types,
703 data->num_phase2_types,
704 hdr, resp))
705 return -1;
706 return 0;
707 }
708
709 if (data->phase2_priv == NULL) {
710 data->phase2_method = eap_peer_get_eap_method(
711 data->phase2_type.vendor,
712 data->phase2_type.method);
713 if (data->phase2_method) {
714 sm->init_phase2 = 1;
715 data->phase2_priv =
716 data->phase2_method->init(sm);
717 sm->init_phase2 = 0;
718 }
719 }
720 if (data->phase2_priv == NULL || data->phase2_method == NULL) {
721 wpa_printf(MSG_INFO, "EAP-PEAP: failed to initialize "
722 "Phase 2 EAP method %d", *pos);
723 ret->methodState = METHOD_DONE;
724 ret->decision = DECISION_FAIL;
725 return -1;
726 }
727 data->phase2_eap_started = 1;
728 os_memset(&iret, 0, sizeof(iret));
729 *resp = data->phase2_method->process(sm, data->phase2_priv,
730 &iret, req);
731 if ((iret.methodState == METHOD_DONE ||
732 iret.methodState == METHOD_MAY_CONT) &&
733 (iret.decision == DECISION_UNCOND_SUCC ||
734 iret.decision == DECISION_COND_SUCC)) {
735 data->phase2_eap_success = 1;
736 data->phase2_success = 1;
737 }
738 break;
739 }
740
741 if (*resp == NULL &&
742 (config->pending_req_identity || config->pending_req_password ||
743 config->pending_req_otp || config->pending_req_new_password)) {
744 wpabuf_free(data->pending_phase2_req);
745 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
746 }
747
748 return 0;
749 }
750
751
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)752 static int eap_peap_decrypt(struct eap_sm *sm, struct eap_peap_data *data,
753 struct eap_method_ret *ret,
754 const struct eap_hdr *req,
755 const struct wpabuf *in_data,
756 struct wpabuf **out_data)
757 {
758 struct wpabuf *in_decrypted = NULL;
759 int res, skip_change = 0;
760 struct eap_hdr *hdr, *rhdr;
761 struct wpabuf *resp = NULL;
762 size_t len;
763
764 wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
765 " Phase 2", (unsigned long) wpabuf_len(in_data));
766
767 if (data->pending_phase2_req) {
768 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 request - "
769 "skip decryption and use old data");
770 /* Clear TLS reassembly state. */
771 eap_peer_tls_reset_input(&data->ssl);
772 in_decrypted = data->pending_phase2_req;
773 data->pending_phase2_req = NULL;
774 skip_change = 1;
775 goto continue_req;
776 }
777
778 if (wpabuf_len(in_data) == 0 && sm->workaround &&
779 data->phase2_success) {
780 /*
781 * Cisco ACS seems to be using TLS ACK to terminate
782 * EAP-PEAPv0/GTC. Try to reply with TLS ACK.
783 */
784 wpa_printf(MSG_DEBUG, "EAP-PEAP: Received TLS ACK, but "
785 "expected data - acknowledge with TLS ACK since "
786 "Phase 2 has been completed");
787 ret->decision = DECISION_COND_SUCC;
788 ret->methodState = METHOD_DONE;
789 return 1;
790 } else if (wpabuf_len(in_data) == 0) {
791 /* Received TLS ACK - requesting more fragments */
792 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
793 data->peap_version,
794 req->identifier, NULL, out_data);
795 }
796
797 res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
798 if (res)
799 return res;
800
801 continue_req:
802 wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP",
803 in_decrypted);
804
805 hdr = wpabuf_mhead(in_decrypted);
806 if (wpabuf_len(in_decrypted) == 5 && hdr->code == EAP_CODE_REQUEST &&
807 be_to_host16(hdr->length) == 5 &&
808 eap_get_type(in_decrypted) == EAP_TYPE_IDENTITY) {
809 /* At least FreeRADIUS seems to send full EAP header with
810 * EAP Request Identity */
811 skip_change = 1;
812 }
813 if (wpabuf_len(in_decrypted) >= 5 && hdr->code == EAP_CODE_REQUEST &&
814 eap_get_type(in_decrypted) == EAP_TYPE_TLV) {
815 skip_change = 1;
816 }
817
818 if (data->peap_version == 0 && !skip_change) {
819 struct eap_hdr *nhdr;
820 struct wpabuf *nmsg = wpabuf_alloc(sizeof(struct eap_hdr) +
821 wpabuf_len(in_decrypted));
822 if (nmsg == NULL) {
823 wpabuf_free(in_decrypted);
824 return 0;
825 }
826 nhdr = wpabuf_put(nmsg, sizeof(*nhdr));
827 wpabuf_put_buf(nmsg, in_decrypted);
828 nhdr->code = req->code;
829 nhdr->identifier = req->identifier;
830 nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
831 wpabuf_len(in_decrypted));
832
833 wpabuf_free(in_decrypted);
834 in_decrypted = nmsg;
835 }
836
837 if (data->peap_version >= 2) {
838 struct eap_tlv_hdr *tlv;
839 struct wpabuf *nmsg;
840
841 if (wpabuf_len(in_decrypted) < sizeof(*tlv) + sizeof(*hdr)) {
842 wpa_printf(MSG_INFO, "EAP-PEAPv2: Too short Phase 2 "
843 "EAP TLV");
844 wpabuf_free(in_decrypted);
845 return 0;
846 }
847 tlv = wpabuf_mhead(in_decrypted);
848 if ((be_to_host16(tlv->tlv_type) & 0x3fff) !=
849 EAP_TLV_EAP_PAYLOAD_TLV) {
850 wpa_printf(MSG_INFO, "EAP-PEAPv2: Not an EAP TLV");
851 wpabuf_free(in_decrypted);
852 return 0;
853 }
854 if (sizeof(*tlv) + be_to_host16(tlv->length) >
855 wpabuf_len(in_decrypted)) {
856 wpa_printf(MSG_INFO, "EAP-PEAPv2: Invalid EAP TLV "
857 "length");
858 wpabuf_free(in_decrypted);
859 return 0;
860 }
861 hdr = (struct eap_hdr *) (tlv + 1);
862 if (be_to_host16(hdr->length) > be_to_host16(tlv->length)) {
863 wpa_printf(MSG_INFO, "EAP-PEAPv2: No room for full "
864 "EAP packet in EAP TLV");
865 wpabuf_free(in_decrypted);
866 return 0;
867 }
868
869 nmsg = wpabuf_alloc(be_to_host16(hdr->length));
870 if (nmsg == NULL) {
871 wpabuf_free(in_decrypted);
872 return 0;
873 }
874
875 wpabuf_put_data(nmsg, hdr, be_to_host16(hdr->length));
876 wpabuf_free(in_decrypted);
877 in_decrypted = nmsg;
878 }
879
880 hdr = wpabuf_mhead(in_decrypted);
881 if (wpabuf_len(in_decrypted) < sizeof(*hdr)) {
882 wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
883 "EAP frame (len=%lu)",
884 (unsigned long) wpabuf_len(in_decrypted));
885 wpabuf_free(in_decrypted);
886 return 0;
887 }
888 len = be_to_host16(hdr->length);
889 if (len > wpabuf_len(in_decrypted)) {
890 wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in "
891 "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
892 (unsigned long) wpabuf_len(in_decrypted),
893 (unsigned long) len);
894 wpabuf_free(in_decrypted);
895 return 0;
896 }
897 if (len < wpabuf_len(in_decrypted)) {
898 wpa_printf(MSG_INFO, "EAP-PEAP: Odd.. Phase 2 EAP header has "
899 "shorter length than full decrypted data "
900 "(%lu < %lu)",
901 (unsigned long) len,
902 (unsigned long) wpabuf_len(in_decrypted));
903 }
904 wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d "
905 "identifier=%d length=%lu", hdr->code, hdr->identifier,
906 (unsigned long) len);
907 switch (hdr->code) {
908 case EAP_CODE_REQUEST:
909 if (eap_peap_phase2_request(sm, data, ret, in_decrypted,
910 &resp)) {
911 wpabuf_free(in_decrypted);
912 wpa_printf(MSG_INFO, "EAP-PEAP: Phase2 Request "
913 "processing failed");
914 return 0;
915 }
916 break;
917 case EAP_CODE_SUCCESS:
918 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success");
919 if (data->peap_version == 1) {
920 /* EAP-Success within TLS tunnel is used to indicate
921 * shutdown of the TLS channel. The authentication has
922 * been completed. */
923 if (data->phase2_eap_started &&
924 !data->phase2_eap_success) {
925 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 "
926 "Success used to indicate success, "
927 "but Phase 2 EAP was not yet "
928 "completed successfully");
929 ret->methodState = METHOD_DONE;
930 ret->decision = DECISION_FAIL;
931 wpabuf_free(in_decrypted);
932 return 0;
933 }
934 wpa_printf(MSG_DEBUG, "EAP-PEAP: Version 1 - "
935 "EAP-Success within TLS tunnel - "
936 "authentication completed");
937 ret->decision = DECISION_UNCOND_SUCC;
938 ret->methodState = METHOD_DONE;
939 data->phase2_success = 1;
940 if (data->peap_outer_success == 2) {
941 wpabuf_free(in_decrypted);
942 wpa_printf(MSG_DEBUG, "EAP-PEAP: Use TLS ACK "
943 "to finish authentication");
944 return 1;
945 } else if (data->peap_outer_success == 1) {
946 /* Reply with EAP-Success within the TLS
947 * channel to complete the authentication. */
948 resp = wpabuf_alloc(sizeof(struct eap_hdr));
949 if (resp) {
950 rhdr = wpabuf_put(resp, sizeof(*rhdr));
951 rhdr->code = EAP_CODE_SUCCESS;
952 rhdr->identifier = hdr->identifier;
953 rhdr->length =
954 host_to_be16(sizeof(*rhdr));
955 }
956 } else {
957 /* No EAP-Success expected for Phase 1 (outer,
958 * unencrypted auth), so force EAP state
959 * machine to SUCCESS state. */
960 sm->peap_done = TRUE;
961 }
962 } else {
963 /* FIX: ? */
964 }
965 break;
966 case EAP_CODE_FAILURE:
967 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure");
968 ret->decision = DECISION_FAIL;
969 ret->methodState = METHOD_MAY_CONT;
970 ret->allowNotifications = FALSE;
971 /* Reply with EAP-Failure within the TLS channel to complete
972 * failure reporting. */
973 resp = wpabuf_alloc(sizeof(struct eap_hdr));
974 if (resp) {
975 rhdr = wpabuf_put(resp, sizeof(*rhdr));
976 rhdr->code = EAP_CODE_FAILURE;
977 rhdr->identifier = hdr->identifier;
978 rhdr->length = host_to_be16(sizeof(*rhdr));
979 }
980 break;
981 default:
982 wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
983 "Phase 2 EAP header", hdr->code);
984 break;
985 }
986
987 wpabuf_free(in_decrypted);
988
989 if (resp) {
990 int skip_change2 = 0;
991 struct wpabuf *rmsg, buf;
992
993 wpa_hexdump_buf_key(MSG_DEBUG,
994 "EAP-PEAP: Encrypting Phase 2 data", resp);
995 /* PEAP version changes */
996 if (data->peap_version >= 2) {
997 resp = eap_peapv2_tlv_eap_payload(resp);
998 if (resp == NULL)
999 return -1;
1000 }
1001 if (wpabuf_len(resp) >= 5 &&
1002 wpabuf_head_u8(resp)[0] == EAP_CODE_RESPONSE &&
1003 eap_get_type(resp) == EAP_TYPE_TLV)
1004 skip_change2 = 1;
1005 rmsg = resp;
1006 if (data->peap_version == 0 && !skip_change2) {
1007 wpabuf_set(&buf, wpabuf_head_u8(resp) +
1008 sizeof(struct eap_hdr),
1009 wpabuf_len(resp) - sizeof(struct eap_hdr));
1010 rmsg = &buf;
1011 }
1012
1013 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
1014 data->peap_version, req->identifier,
1015 rmsg, out_data)) {
1016 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to encrypt "
1017 "a Phase 2 frame");
1018 }
1019 wpabuf_free(resp);
1020 }
1021
1022 return 0;
1023 }
1024
1025
eap_peap_process(struct eap_sm * sm,void * priv,struct eap_method_ret * ret,const struct wpabuf * reqData)1026 static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv,
1027 struct eap_method_ret *ret,
1028 const struct wpabuf *reqData)
1029 {
1030 const struct eap_hdr *req;
1031 size_t left;
1032 int res;
1033 u8 flags, id;
1034 struct wpabuf *resp;
1035 const u8 *pos;
1036 struct eap_peap_data *data = priv;
1037
1038 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_PEAP, ret,
1039 reqData, &left, &flags);
1040 if (pos == NULL)
1041 return NULL;
1042 req = wpabuf_head(reqData);
1043 id = req->identifier;
1044
1045 if (flags & EAP_TLS_FLAGS_START) {
1046 wpa_printf(MSG_DEBUG, "EAP-PEAP: Start (server ver=%d, own "
1047 "ver=%d)", flags & EAP_TLS_VERSION_MASK,
1048 data->peap_version);
1049 if ((flags & EAP_TLS_VERSION_MASK) < data->peap_version)
1050 data->peap_version = flags & EAP_TLS_VERSION_MASK;
1051 if (data->force_peap_version >= 0 &&
1052 data->force_peap_version != data->peap_version) {
1053 wpa_printf(MSG_WARNING, "EAP-PEAP: Failed to select "
1054 "forced PEAP version %d",
1055 data->force_peap_version);
1056 ret->methodState = METHOD_DONE;
1057 ret->decision = DECISION_FAIL;
1058 ret->allowNotifications = FALSE;
1059 return NULL;
1060 }
1061 wpa_printf(MSG_DEBUG, "EAP-PEAP: Using PEAP version %d",
1062 data->peap_version);
1063 left = 0; /* make sure that this frame is empty, even though it
1064 * should always be, anyway */
1065 }
1066
1067 resp = NULL;
1068 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1069 !data->resuming) {
1070 struct wpabuf msg;
1071 wpabuf_set(&msg, pos, left);
1072 res = eap_peap_decrypt(sm, data, ret, req, &msg, &resp);
1073 } else {
1074 res = eap_peer_tls_process_helper(sm, &data->ssl,
1075 EAP_TYPE_PEAP,
1076 data->peap_version, id, pos,
1077 left, &resp);
1078
1079 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1080 char *label;
1081 wpa_printf(MSG_DEBUG,
1082 "EAP-PEAP: TLS done, proceed to Phase 2");
1083 os_free(data->key_data);
1084 /* draft-josefsson-ppext-eap-tls-eap-05.txt
1085 * specifies that PEAPv1 would use "client PEAP
1086 * encryption" as the label. However, most existing
1087 * PEAPv1 implementations seem to be using the old
1088 * label, "client EAP encryption", instead. Use the old
1089 * label by default, but allow it to be configured with
1090 * phase1 parameter peaplabel=1. */
1091 if (data->peap_version > 1 || data->force_new_label)
1092 label = "client PEAP encryption";
1093 else
1094 label = "client EAP encryption";
1095 wpa_printf(MSG_DEBUG, "EAP-PEAP: using label '%s' in "
1096 "key derivation", label);
1097 data->key_data =
1098 eap_peer_tls_derive_key(sm, &data->ssl, label,
1099 EAP_TLS_KEY_LEN);
1100 if (data->key_data) {
1101 wpa_hexdump_key(MSG_DEBUG,
1102 "EAP-PEAP: Derived key",
1103 data->key_data,
1104 EAP_TLS_KEY_LEN);
1105 } else {
1106 wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to "
1107 "derive key");
1108 }
1109
1110 if (sm->workaround && data->resuming) {
1111 /*
1112 * At least few RADIUS servers (Aegis v1.1.6;
1113 * but not v1.1.4; and Cisco ACS) seem to be
1114 * terminating PEAPv1 (Aegis) or PEAPv0 (Cisco
1115 * ACS) session resumption with outer
1116 * EAP-Success. This does not seem to follow
1117 * draft-josefsson-pppext-eap-tls-eap-05.txt
1118 * section 4.2, so only allow this if EAP
1119 * workarounds are enabled.
1120 */
1121 wpa_printf(MSG_DEBUG, "EAP-PEAP: Workaround - "
1122 "allow outer EAP-Success to "
1123 "terminate PEAP resumption");
1124 ret->decision = DECISION_COND_SUCC;
1125 data->phase2_success = 1;
1126 }
1127
1128 data->resuming = 0;
1129 }
1130
1131 if (res == 2) {
1132 struct wpabuf msg;
1133 /*
1134 * Application data included in the handshake message.
1135 */
1136 wpabuf_free(data->pending_phase2_req);
1137 data->pending_phase2_req = resp;
1138 resp = NULL;
1139 wpabuf_set(&msg, pos, left);
1140 res = eap_peap_decrypt(sm, data, ret, req, &msg,
1141 &resp);
1142 }
1143 }
1144
1145 if (ret->methodState == METHOD_DONE) {
1146 ret->allowNotifications = FALSE;
1147 }
1148
1149 if (res == 1) {
1150 wpabuf_free(resp);
1151 return eap_peer_tls_build_ack(id, EAP_TYPE_PEAP,
1152 data->peap_version);
1153 }
1154
1155 return resp;
1156 }
1157
1158
eap_peap_has_reauth_data(struct eap_sm * sm,void * priv)1159 static Boolean eap_peap_has_reauth_data(struct eap_sm *sm, void *priv)
1160 {
1161 struct eap_peap_data *data = priv;
1162 return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1163 data->phase2_success;
1164 }
1165
1166
eap_peap_deinit_for_reauth(struct eap_sm * sm,void * priv)1167 static void eap_peap_deinit_for_reauth(struct eap_sm *sm, void *priv)
1168 {
1169 struct eap_peap_data *data = priv;
1170 wpabuf_free(data->pending_phase2_req);
1171 data->pending_phase2_req = NULL;
1172 data->crypto_binding_used = 0;
1173 }
1174
1175
eap_peap_init_for_reauth(struct eap_sm * sm,void * priv)1176 static void * eap_peap_init_for_reauth(struct eap_sm *sm, void *priv)
1177 {
1178 struct eap_peap_data *data = priv;
1179 os_free(data->key_data);
1180 data->key_data = NULL;
1181 if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1182 os_free(data);
1183 return NULL;
1184 }
1185 if (data->phase2_priv && data->phase2_method &&
1186 data->phase2_method->init_for_reauth)
1187 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1188 data->phase2_success = 0;
1189 data->phase2_eap_success = 0;
1190 data->phase2_eap_started = 0;
1191 data->resuming = 1;
1192 data->reauth = 1;
1193 sm->peap_done = FALSE;
1194 return priv;
1195 }
1196
1197
eap_peap_get_status(struct eap_sm * sm,void * priv,char * buf,size_t buflen,int verbose)1198 static int eap_peap_get_status(struct eap_sm *sm, void *priv, char *buf,
1199 size_t buflen, int verbose)
1200 {
1201 struct eap_peap_data *data = priv;
1202 int len, ret;
1203
1204 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1205 if (data->phase2_method) {
1206 ret = os_snprintf(buf + len, buflen - len,
1207 "EAP-PEAPv%d Phase2 method=%s\n",
1208 data->peap_version,
1209 data->phase2_method->name);
1210 if (ret < 0 || (size_t) ret >= buflen - len)
1211 return len;
1212 len += ret;
1213 }
1214 return len;
1215 }
1216
1217
eap_peap_isKeyAvailable(struct eap_sm * sm,void * priv)1218 static Boolean eap_peap_isKeyAvailable(struct eap_sm *sm, void *priv)
1219 {
1220 struct eap_peap_data *data = priv;
1221 return data->key_data != NULL && data->phase2_success;
1222 }
1223
1224
eap_peap_getKey(struct eap_sm * sm,void * priv,size_t * len)1225 static u8 * eap_peap_getKey(struct eap_sm *sm, void *priv, size_t *len)
1226 {
1227 struct eap_peap_data *data = priv;
1228 u8 *key;
1229
1230 if (data->key_data == NULL || !data->phase2_success)
1231 return NULL;
1232
1233 key = os_malloc(EAP_TLS_KEY_LEN);
1234 if (key == NULL)
1235 return NULL;
1236
1237 *len = EAP_TLS_KEY_LEN;
1238
1239 if (data->crypto_binding_used) {
1240 u8 csk[128];
1241 /*
1242 * Note: It looks like Microsoft implementation requires null
1243 * termination for this label while the one used for deriving
1244 * IPMK|CMK did not use null termination.
1245 */
1246 if (peap_prfplus(data->peap_version, data->ipmk, 40,
1247 "Session Key Generating Function",
1248 (u8 *) "\00", 1, csk, sizeof(csk)) < 0) {
1249 os_free(key);
1250 return NULL;
1251 }
1252 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk));
1253 os_memcpy(key, csk, EAP_TLS_KEY_LEN);
1254 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
1255 key, EAP_TLS_KEY_LEN);
1256 } else
1257 os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
1258
1259 return key;
1260 }
1261
1262
eap_peer_peap_register(void)1263 int eap_peer_peap_register(void)
1264 {
1265 struct eap_method *eap;
1266 int ret;
1267
1268 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1269 EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP");
1270 if (eap == NULL)
1271 return -1;
1272
1273 eap->init = eap_peap_init;
1274 eap->deinit = eap_peap_deinit;
1275 eap->process = eap_peap_process;
1276 eap->isKeyAvailable = eap_peap_isKeyAvailable;
1277 eap->getKey = eap_peap_getKey;
1278 eap->get_status = eap_peap_get_status;
1279 eap->has_reauth_data = eap_peap_has_reauth_data;
1280 eap->deinit_for_reauth = eap_peap_deinit_for_reauth;
1281 eap->init_for_reauth = eap_peap_init_for_reauth;
1282
1283 ret = eap_peer_method_register(eap);
1284 if (ret)
1285 eap_peer_method_free(eap);
1286 return ret;
1287 }
1288