1 /*
2 * EAP peer method: EAP-PEAP (draft-josefsson-pppext-eap-tls-eap-10.txt)
3 * Copyright (c) 2004-2019, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10
11 #include "common.h"
12 #include "crypto/sha1.h"
13 #include "crypto/tls.h"
14 #include "eap_common/eap_tlv_common.h"
15 #include "eap_common/eap_peap_common.h"
16 #include "eap_i.h"
17 #include "eap_tls_common.h"
18 #include "eap_config.h"
19 #include "tncc.h"
20
21
22 /* Maximum supported PEAP version
23 * 0 = Microsoft's PEAP version 0; draft-kamath-pppext-peapv0-00.txt
24 * 1 = draft-josefsson-ppext-eap-tls-eap-05.txt
25 */
26 #define EAP_PEAP_VERSION 1
27
28
29 static void eap_peap_deinit(struct eap_sm *sm, void *priv);
30
31
32 struct eap_peap_data {
33 struct eap_ssl_data ssl;
34
35 int peap_version, force_peap_version, force_new_label;
36
37 const struct eap_method *phase2_method;
38 void *phase2_priv;
39 int phase2_success;
40 int phase2_eap_success;
41 int phase2_eap_started;
42
43 struct eap_method_type phase2_type;
44 struct eap_method_type *phase2_types;
45 size_t num_phase2_types;
46
47 int peap_outer_success; /* 0 = PEAP terminated on Phase 2 inner
48 * EAP-Success
49 * 1 = reply with tunneled EAP-Success to inner
50 * EAP-Success and expect AS to send outer
51 * (unencrypted) EAP-Success after this
52 * 2 = reply with PEAP/TLS ACK to inner
53 * EAP-Success and expect AS to send outer
54 * (unencrypted) EAP-Success after this */
55 int resuming; /* starting a resumed session */
56 int reauth; /* reauthentication */
57 u8 *key_data;
58 u8 *session_id;
59 size_t id_len;
60
61 struct wpabuf *pending_phase2_req;
62 struct wpabuf *pending_resp;
63 enum { NO_BINDING, OPTIONAL_BINDING, REQUIRE_BINDING } crypto_binding;
64 int crypto_binding_used;
65 u8 binding_nonce[32];
66 u8 ipmk[40];
67 u8 cmk[20];
68 int soh; /* Whether IF-TNCCS-SOH (Statement of Health; Microsoft NAP)
69 * is enabled. */
70 };
71
72
eap_peap_parse_phase1(struct eap_peap_data * data,const char * phase1)73 static void eap_peap_parse_phase1(struct eap_peap_data *data,
74 const char *phase1)
75 {
76 const char *pos;
77
78 pos = os_strstr(phase1, "peapver=");
79 if (pos) {
80 data->force_peap_version = atoi(pos + 8);
81 data->peap_version = data->force_peap_version;
82 wpa_printf(MSG_DEBUG, "EAP-PEAP: Forced PEAP version %d",
83 data->force_peap_version);
84 }
85
86 if (os_strstr(phase1, "peaplabel=1")) {
87 data->force_new_label = 1;
88 wpa_printf(MSG_DEBUG, "EAP-PEAP: Force new label for key "
89 "derivation");
90 }
91
92 if (os_strstr(phase1, "peap_outer_success=0")) {
93 data->peap_outer_success = 0;
94 wpa_printf(MSG_DEBUG, "EAP-PEAP: terminate authentication on "
95 "tunneled EAP-Success");
96 } else if (os_strstr(phase1, "peap_outer_success=1")) {
97 data->peap_outer_success = 1;
98 wpa_printf(MSG_DEBUG, "EAP-PEAP: send tunneled EAP-Success "
99 "after receiving tunneled EAP-Success");
100 } else if (os_strstr(phase1, "peap_outer_success=2")) {
101 data->peap_outer_success = 2;
102 wpa_printf(MSG_DEBUG, "EAP-PEAP: send PEAP/TLS ACK after "
103 "receiving tunneled EAP-Success");
104 }
105
106 if (os_strstr(phase1, "crypto_binding=0")) {
107 data->crypto_binding = NO_BINDING;
108 wpa_printf(MSG_DEBUG, "EAP-PEAP: Do not use cryptobinding");
109 } else if (os_strstr(phase1, "crypto_binding=1")) {
110 data->crypto_binding = OPTIONAL_BINDING;
111 wpa_printf(MSG_DEBUG, "EAP-PEAP: Optional cryptobinding");
112 } else if (os_strstr(phase1, "crypto_binding=2")) {
113 data->crypto_binding = REQUIRE_BINDING;
114 wpa_printf(MSG_DEBUG, "EAP-PEAP: Require cryptobinding");
115 }
116
117 #ifdef EAP_TNC
118 if (os_strstr(phase1, "tnc=soh2")) {
119 data->soh = 2;
120 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled");
121 } else if (os_strstr(phase1, "tnc=soh1")) {
122 data->soh = 1;
123 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 1 enabled");
124 } else if (os_strstr(phase1, "tnc=soh")) {
125 data->soh = 2;
126 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled");
127 }
128 #endif /* EAP_TNC */
129 }
130
131
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);
148
149 if (eap_peer_select_phase2_methods(config, "auth=",
150 &data->phase2_types,
151 &data->num_phase2_types, 0) < 0) {
152 eap_peap_deinit(sm, data);
153 return NULL;
154 }
155
156 data->phase2_type.vendor = EAP_VENDOR_IETF;
157 data->phase2_type.method = EAP_TYPE_NONE;
158
159 if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_PEAP)) {
160 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to initialize SSL.");
161 eap_peap_deinit(sm, data);
162 return NULL;
163 }
164
165 return data;
166 }
167
168
eap_peap_free_key(struct eap_peap_data * data)169 static void eap_peap_free_key(struct eap_peap_data *data)
170 {
171 if (data->key_data) {
172 bin_clear_free(data->key_data, EAP_TLS_KEY_LEN + EAP_EMSK_LEN);
173 data->key_data = NULL;
174 }
175 }
176
177
eap_peap_deinit(struct eap_sm * sm,void * priv)178 static void eap_peap_deinit(struct eap_sm *sm, void *priv)
179 {
180 struct eap_peap_data *data = priv;
181 if (data == NULL)
182 return;
183 if (data->phase2_priv && data->phase2_method)
184 data->phase2_method->deinit(sm, data->phase2_priv);
185 os_free(data->phase2_types);
186 eap_peer_tls_ssl_deinit(sm, &data->ssl);
187 eap_peap_free_key(data);
188 os_free(data->session_id);
189 wpabuf_clear_free(data->pending_phase2_req);
190 wpabuf_clear_free(data->pending_resp);
191 bin_clear_free(data, sizeof(*data));
192 }
193
194
195 /**
196 * eap_tlv_build_nak - Build EAP-TLV NAK message
197 * @id: EAP identifier for the header
198 * @nak_type: TLV type (EAP_TLV_*)
199 * Returns: Buffer to the allocated EAP-TLV NAK message or %NULL on failure
200 *
201 * This function builds an EAP-TLV NAK message. The caller is responsible for
202 * freeing the returned buffer.
203 */
eap_tlv_build_nak(int id,u16 nak_type)204 static struct wpabuf * eap_tlv_build_nak(int id, u16 nak_type)
205 {
206 struct wpabuf *msg;
207
208 msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, 10,
209 EAP_CODE_RESPONSE, id);
210 if (msg == NULL)
211 return NULL;
212
213 wpabuf_put_u8(msg, 0x80); /* Mandatory */
214 wpabuf_put_u8(msg, EAP_TLV_NAK_TLV);
215 wpabuf_put_be16(msg, 6); /* Length */
216 wpabuf_put_be32(msg, 0); /* Vendor-Id */
217 wpabuf_put_be16(msg, nak_type); /* NAK-Type */
218
219 return msg;
220 }
221
222
eap_peap_get_isk(struct eap_sm * sm,struct eap_peap_data * data,u8 * isk,size_t isk_len)223 static int eap_peap_get_isk(struct eap_sm *sm, struct eap_peap_data *data,
224 u8 *isk, size_t isk_len)
225 {
226 u8 *key;
227 size_t key_len;
228
229 os_memset(isk, 0, isk_len);
230 if (data->phase2_method == NULL || data->phase2_priv == NULL ||
231 data->phase2_method->isKeyAvailable == NULL ||
232 data->phase2_method->getKey == NULL)
233 return 0;
234
235 if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
236 (key = data->phase2_method->getKey(sm, data->phase2_priv,
237 &key_len)) == NULL) {
238 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not get key material "
239 "from Phase 2");
240 return -1;
241 }
242
243 if (key_len > isk_len)
244 key_len = isk_len;
245 os_memcpy(isk, key, key_len);
246 os_free(key);
247
248 return 0;
249 }
250
251
eap_peap_derive_cmk(struct eap_sm * sm,struct eap_peap_data * data)252 static int eap_peap_derive_cmk(struct eap_sm *sm, struct eap_peap_data *data)
253 {
254 u8 *tk;
255 u8 isk[32], imck[60];
256 int resumed, res;
257
258 /*
259 * Tunnel key (TK) is the first 60 octets of the key generated by
260 * phase 1 of PEAP (based on TLS).
261 */
262 tk = data->key_data;
263 if (tk == NULL)
264 return -1;
265 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TK", tk, 60);
266
267 resumed = tls_connection_resumed(sm->ssl_ctx, data->ssl.conn);
268 wpa_printf(MSG_DEBUG,
269 "EAP-PEAP: CMK derivation - reauth=%d resumed=%d phase2_eap_started=%d phase2_success=%d",
270 data->reauth, resumed, data->phase2_eap_started,
271 data->phase2_success);
272 if (data->reauth && !data->phase2_eap_started && resumed) {
273 /* Fast-connect: IPMK|CMK = TK */
274 os_memcpy(data->ipmk, tk, 40);
275 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK from TK",
276 data->ipmk, 40);
277 os_memcpy(data->cmk, tk + 40, 20);
278 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK from TK",
279 data->cmk, 20);
280 return 0;
281 }
282
283 if (eap_peap_get_isk(sm, data, isk, sizeof(isk)) < 0)
284 return -1;
285 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: ISK", isk, sizeof(isk));
286
287 /*
288 * IPMK Seed = "Inner Methods Compound Keys" | ISK
289 * TempKey = First 40 octets of TK
290 * IPMK|CMK = PRF+(TempKey, IPMK Seed, 60)
291 * (note: draft-josefsson-pppext-eap-tls-eap-10.txt includes a space
292 * in the end of the label just before ISK; is that just a typo?)
293 */
294 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TempKey", tk, 40);
295 res = peap_prfplus(data->peap_version, tk, 40,
296 "Inner Methods Compound Keys",
297 isk, sizeof(isk), imck, sizeof(imck));
298 forced_memzero(isk, sizeof(isk));
299 if (res < 0)
300 return -1;
301 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IMCK (IPMKj)",
302 imck, sizeof(imck));
303
304 os_memcpy(data->ipmk, imck, 40);
305 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK (S-IPMKj)", data->ipmk, 40);
306 os_memcpy(data->cmk, imck + 40, 20);
307 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK (CMKj)", data->cmk, 20);
308 forced_memzero(imck, sizeof(imck));
309
310 return 0;
311 }
312
313
eap_tlv_add_cryptobinding(struct eap_sm * sm,struct eap_peap_data * data,struct wpabuf * buf)314 static int eap_tlv_add_cryptobinding(struct eap_sm *sm,
315 struct eap_peap_data *data,
316 struct wpabuf *buf)
317 {
318 u8 *mac;
319 u8 eap_type = EAP_TYPE_PEAP;
320 const u8 *addr[2];
321 size_t len[2];
322 u16 tlv_type;
323
324 /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
325 addr[0] = wpabuf_put(buf, 0);
326 len[0] = 60;
327 addr[1] = &eap_type;
328 len[1] = 1;
329
330 tlv_type = EAP_TLV_CRYPTO_BINDING_TLV;
331 wpabuf_put_be16(buf, tlv_type);
332 wpabuf_put_be16(buf, 56);
333
334 wpabuf_put_u8(buf, 0); /* Reserved */
335 wpabuf_put_u8(buf, data->peap_version); /* Version */
336 wpabuf_put_u8(buf, data->peap_version); /* RecvVersion */
337 wpabuf_put_u8(buf, 1); /* SubType: 0 = Request, 1 = Response */
338 wpabuf_put_data(buf, data->binding_nonce, 32); /* Nonce */
339 mac = wpabuf_put(buf, 20); /* Compound_MAC */
340 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC CMK", data->cmk, 20);
341 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 1",
342 addr[0], len[0]);
343 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 2",
344 addr[1], len[1]);
345 if (hmac_sha1_vector(data->cmk, 20, 2, addr, len, mac) < 0)
346 return -1;
347 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC", mac, SHA1_MAC_LEN);
348 data->crypto_binding_used = 1;
349
350 return 0;
351 }
352
353
354 /**
355 * eap_tlv_build_result - Build EAP-TLV Result message
356 * @id: EAP identifier for the header
357 * @status: Status (EAP_TLV_RESULT_SUCCESS or EAP_TLV_RESULT_FAILURE)
358 * Returns: Buffer to the allocated EAP-TLV Result message or %NULL on failure
359 *
360 * This function builds an EAP-TLV Result message. The caller is responsible
361 * for freeing the returned buffer.
362 */
eap_tlv_build_result(struct eap_sm * sm,struct eap_peap_data * data,int crypto_tlv_used,int id,u16 status)363 static struct wpabuf * eap_tlv_build_result(struct eap_sm *sm,
364 struct eap_peap_data *data,
365 int crypto_tlv_used,
366 int id, u16 status)
367 {
368 struct wpabuf *msg;
369 size_t len;
370
371 if (data->crypto_binding == NO_BINDING)
372 crypto_tlv_used = 0;
373
374 len = 6;
375 if (crypto_tlv_used)
376 len += 60; /* Cryptobinding TLV */
377 msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, len,
378 EAP_CODE_RESPONSE, id);
379 if (msg == NULL)
380 return NULL;
381
382 wpabuf_put_u8(msg, 0x80); /* Mandatory */
383 wpabuf_put_u8(msg, EAP_TLV_RESULT_TLV);
384 wpabuf_put_be16(msg, 2); /* Length */
385 wpabuf_put_be16(msg, status); /* Status */
386
387 if (crypto_tlv_used && eap_tlv_add_cryptobinding(sm, data, msg)) {
388 wpabuf_clear_free(msg);
389 return NULL;
390 }
391
392 return msg;
393 }
394
395
eap_tlv_validate_cryptobinding(struct eap_sm * sm,struct eap_peap_data * data,const u8 * crypto_tlv,size_t crypto_tlv_len)396 static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
397 struct eap_peap_data *data,
398 const u8 *crypto_tlv,
399 size_t crypto_tlv_len)
400 {
401 u8 buf[61], mac[SHA1_MAC_LEN];
402 const u8 *pos;
403
404 if (eap_peap_derive_cmk(sm, data) < 0) {
405 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not derive CMK");
406 return -1;
407 }
408
409 if (crypto_tlv_len != 4 + 56) {
410 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid cryptobinding TLV "
411 "length %d", (int) crypto_tlv_len);
412 return -1;
413 }
414
415 pos = crypto_tlv;
416 pos += 4; /* TLV header */
417 if (pos[1] != data->peap_version) {
418 wpa_printf(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV Version "
419 "mismatch (was %d; expected %d)",
420 pos[1], data->peap_version);
421 return -1;
422 }
423
424 if (pos[3] != 0) {
425 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV "
426 "SubType %d", pos[3]);
427 return -1;
428 }
429 pos += 4;
430 os_memcpy(data->binding_nonce, pos, 32);
431 pos += 32; /* Nonce */
432
433 /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
434 os_memcpy(buf, crypto_tlv, 60);
435 os_memset(buf + 4 + 4 + 32, 0, 20); /* Compound_MAC */
436 buf[60] = EAP_TYPE_PEAP;
437 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Compound_MAC data",
438 buf, sizeof(buf));
439 hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);
440
441 if (os_memcmp_const(mac, pos, SHA1_MAC_LEN) != 0) {
442 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
443 "cryptobinding TLV");
444 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received MAC",
445 pos, SHA1_MAC_LEN);
446 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Expected MAC",
447 mac, SHA1_MAC_LEN);
448 return -1;
449 }
450
451 wpa_printf(MSG_DEBUG, "EAP-PEAP: Valid cryptobinding TLV received");
452
453 return 0;
454 }
455
456
457 /**
458 * eap_tlv_process - Process a received EAP-TLV message and generate a response
459 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
460 * @ret: Return values from EAP request validation and processing
461 * @req: EAP-TLV request to be processed. The caller must have validated that
462 * the buffer is large enough to contain full request (hdr->length bytes) and
463 * that the EAP type is EAP_TYPE_TLV.
464 * @resp: Buffer to return a pointer to the allocated response message. This
465 * field should be initialized to %NULL before the call. The value will be
466 * updated if a response message is generated. The caller is responsible for
467 * freeing the allocated message.
468 * @force_failure: Force negotiation to fail
469 * Returns: 0 on success, -1 on failure
470 */
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)471 static int eap_tlv_process(struct eap_sm *sm, struct eap_peap_data *data,
472 struct eap_method_ret *ret,
473 const struct wpabuf *req, struct wpabuf **resp,
474 int force_failure)
475 {
476 size_t left, tlv_len;
477 const u8 *pos;
478 const u8 *result_tlv = NULL, *crypto_tlv = NULL;
479 size_t result_tlv_len = 0, crypto_tlv_len = 0;
480 int tlv_type, mandatory;
481
482 /* Parse TLVs */
483 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, req, &left);
484 if (pos == NULL)
485 return -1;
486 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Received TLVs", pos, left);
487 while (left >= 4) {
488 mandatory = !!(pos[0] & 0x80);
489 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
490 pos += 2;
491 tlv_len = WPA_GET_BE16(pos);
492 pos += 2;
493 left -= 4;
494 if (tlv_len > left) {
495 wpa_printf(MSG_DEBUG, "EAP-TLV: TLV underrun "
496 "(tlv_len=%lu left=%lu)",
497 (unsigned long) tlv_len,
498 (unsigned long) left);
499 return -1;
500 }
501 switch (tlv_type) {
502 case EAP_TLV_RESULT_TLV:
503 result_tlv = pos;
504 result_tlv_len = tlv_len;
505 break;
506 case EAP_TLV_CRYPTO_BINDING_TLV:
507 crypto_tlv = pos;
508 crypto_tlv_len = tlv_len;
509 break;
510 default:
511 wpa_printf(MSG_DEBUG, "EAP-TLV: Unsupported TLV Type "
512 "%d%s", tlv_type,
513 mandatory ? " (mandatory)" : "");
514 if (mandatory) {
515 /* NAK TLV and ignore all TLVs in this packet.
516 */
517 *resp = eap_tlv_build_nak(eap_get_id(req),
518 tlv_type);
519 return *resp == NULL ? -1 : 0;
520 }
521 /* Ignore this TLV, but process other TLVs */
522 break;
523 }
524
525 pos += tlv_len;
526 left -= tlv_len;
527 }
528 if (left) {
529 wpa_printf(MSG_DEBUG, "EAP-TLV: Last TLV too short in "
530 "Request (left=%lu)", (unsigned long) left);
531 return -1;
532 }
533
534 /* Process supported TLVs */
535 if (crypto_tlv && data->crypto_binding != NO_BINDING) {
536 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV",
537 crypto_tlv, crypto_tlv_len);
538 if (eap_tlv_validate_cryptobinding(sm, data, crypto_tlv - 4,
539 crypto_tlv_len + 4) < 0) {
540 if (result_tlv == NULL)
541 return -1;
542 force_failure = 1;
543 crypto_tlv = NULL; /* do not include Cryptobinding TLV
544 * in response, if the received
545 * cryptobinding was invalid. */
546 }
547 } else if (!crypto_tlv && data->crypto_binding == REQUIRE_BINDING) {
548 wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV");
549 return -1;
550 }
551
552 if (result_tlv) {
553 int status, resp_status;
554 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Result TLV",
555 result_tlv, result_tlv_len);
556 if (result_tlv_len < 2) {
557 wpa_printf(MSG_INFO, "EAP-TLV: Too short Result TLV "
558 "(len=%lu)",
559 (unsigned long) result_tlv_len);
560 return -1;
561 }
562 status = WPA_GET_BE16(result_tlv);
563 if (status == EAP_TLV_RESULT_SUCCESS) {
564 wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Success "
565 "- EAP-TLV/Phase2 Completed");
566 if (force_failure) {
567 wpa_printf(MSG_INFO, "EAP-TLV: Earlier failure"
568 " - force failed Phase 2");
569 resp_status = EAP_TLV_RESULT_FAILURE;
570 ret->decision = DECISION_FAIL;
571 } else {
572 resp_status = EAP_TLV_RESULT_SUCCESS;
573 ret->decision = DECISION_UNCOND_SUCC;
574 }
575 } else if (status == EAP_TLV_RESULT_FAILURE) {
576 wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Failure");
577 resp_status = EAP_TLV_RESULT_FAILURE;
578 ret->decision = DECISION_FAIL;
579 } else {
580 wpa_printf(MSG_INFO, "EAP-TLV: Unknown TLV Result "
581 "Status %d", status);
582 resp_status = EAP_TLV_RESULT_FAILURE;
583 ret->decision = DECISION_FAIL;
584 }
585 ret->methodState = METHOD_DONE;
586
587 *resp = eap_tlv_build_result(sm, data, crypto_tlv != NULL,
588 eap_get_id(req), resp_status);
589 }
590
591 return 0;
592 }
593
594
eap_peap_phase2_request(struct eap_sm * sm,struct eap_peap_data * data,struct eap_method_ret * ret,struct wpabuf * req,struct wpabuf ** resp)595 static int eap_peap_phase2_request(struct eap_sm *sm,
596 struct eap_peap_data *data,
597 struct eap_method_ret *ret,
598 struct wpabuf *req,
599 struct wpabuf **resp)
600 {
601 struct eap_hdr *hdr = wpabuf_mhead(req);
602 size_t len = be_to_host16(hdr->length);
603 u8 *pos;
604 struct eap_method_ret iret;
605 struct eap_peer_config *config = eap_get_config(sm);
606 int vendor;
607 enum eap_type method;
608
609 if (len <= sizeof(struct eap_hdr)) {
610 wpa_printf(MSG_INFO, "EAP-PEAP: too short "
611 "Phase 2 request (len=%lu)", (unsigned long) len);
612 return -1;
613 }
614 pos = (u8 *) (hdr + 1);
615 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Request: type=%d", *pos);
616 switch (*pos) {
617 case EAP_TYPE_IDENTITY:
618 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
619 break;
620 case EAP_TYPE_TLV:
621 os_memset(&iret, 0, sizeof(iret));
622 if (eap_tlv_process(sm, data, &iret, req, resp,
623 data->phase2_eap_started &&
624 !data->phase2_eap_success)) {
625 ret->methodState = METHOD_DONE;
626 ret->decision = DECISION_FAIL;
627 return -1;
628 }
629 if (iret.methodState == METHOD_DONE ||
630 iret.methodState == METHOD_MAY_CONT) {
631 ret->methodState = iret.methodState;
632 ret->decision = iret.decision;
633 data->phase2_success = 1;
634 }
635 break;
636 case EAP_TYPE_EXPANDED:
637 #ifdef EAP_TNC
638 if (data->soh) {
639 const u8 *epos;
640 size_t eleft;
641
642 epos = eap_hdr_validate(EAP_VENDOR_MICROSOFT, 0x21,
643 req, &eleft);
644 if (epos) {
645 struct wpabuf *buf;
646 wpa_printf(MSG_DEBUG,
647 "EAP-PEAP: SoH EAP Extensions");
648 buf = tncc_process_soh_request(data->soh,
649 epos, eleft);
650 if (buf) {
651 *resp = eap_msg_alloc(
652 EAP_VENDOR_MICROSOFT, 0x21,
653 wpabuf_len(buf),
654 EAP_CODE_RESPONSE,
655 hdr->identifier);
656 if (*resp == NULL) {
657 ret->methodState = METHOD_DONE;
658 ret->decision = DECISION_FAIL;
659 wpabuf_clear_free(buf);
660 return -1;
661 }
662 wpabuf_put_buf(*resp, buf);
663 wpabuf_clear_free(buf);
664 break;
665 }
666 }
667 }
668 #endif /* EAP_TNC */
669 /* fall through */
670 default:
671 vendor = EAP_VENDOR_IETF;
672 method = *pos;
673
674 if (method == EAP_TYPE_EXPANDED) {
675 if (len < sizeof(struct eap_hdr) + 8) {
676 wpa_printf(MSG_INFO,
677 "EAP-PEAP: Too short Phase 2 request (expanded header) (len=%lu)",
678 (unsigned long) len);
679 return -1;
680 }
681 vendor = WPA_GET_BE24(pos + 1);
682 method = WPA_GET_BE32(pos + 4);
683 }
684
685 if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
686 data->phase2_type.method == EAP_TYPE_NONE) {
687 size_t i;
688 for (i = 0; i < data->num_phase2_types; i++) {
689 if (data->phase2_types[i].vendor != vendor ||
690 data->phase2_types[i].method != method)
691 continue;
692
693 data->phase2_type.vendor =
694 data->phase2_types[i].vendor;
695 data->phase2_type.method =
696 data->phase2_types[i].method;
697 wpa_printf(MSG_DEBUG, "EAP-PEAP: Selected "
698 "Phase 2 EAP vendor %d method %d",
699 data->phase2_type.vendor,
700 data->phase2_type.method);
701 break;
702 }
703 }
704 if (vendor != data->phase2_type.vendor ||
705 method != data->phase2_type.method ||
706 (vendor == EAP_VENDOR_IETF && method == EAP_TYPE_NONE)) {
707 if (eap_peer_tls_phase2_nak(data->phase2_types,
708 data->num_phase2_types,
709 hdr, resp))
710 return -1;
711 return 0;
712 }
713
714 if (data->phase2_priv == NULL) {
715 data->phase2_method = eap_peer_get_eap_method(
716 data->phase2_type.vendor,
717 data->phase2_type.method);
718 if (data->phase2_method) {
719 sm->init_phase2 = 1;
720 data->phase2_priv =
721 data->phase2_method->init(sm);
722 sm->init_phase2 = 0;
723 }
724 }
725 if (data->phase2_priv == NULL || data->phase2_method == NULL) {
726 wpa_printf(MSG_INFO, "EAP-PEAP: failed to initialize "
727 "Phase 2 EAP method %d", *pos);
728 ret->methodState = METHOD_DONE;
729 ret->decision = DECISION_FAIL;
730 return -1;
731 }
732 data->phase2_eap_started = 1;
733 os_memset(&iret, 0, sizeof(iret));
734 *resp = data->phase2_method->process(sm, data->phase2_priv,
735 &iret, req);
736 if ((iret.methodState == METHOD_DONE ||
737 iret.methodState == METHOD_MAY_CONT) &&
738 (iret.decision == DECISION_UNCOND_SUCC ||
739 iret.decision == DECISION_COND_SUCC)) {
740 data->phase2_eap_success = 1;
741 data->phase2_success = 1;
742 }
743 break;
744 }
745
746 if (*resp == NULL &&
747 (config->pending_req_identity || config->pending_req_password ||
748 config->pending_req_otp || config->pending_req_new_password ||
749 config->pending_req_sim)) {
750 wpabuf_clear_free(data->pending_phase2_req);
751 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
752 }
753
754 return 0;
755 }
756
757
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)758 static int eap_peap_decrypt(struct eap_sm *sm, struct eap_peap_data *data,
759 struct eap_method_ret *ret,
760 const struct eap_hdr *req,
761 const struct wpabuf *in_data,
762 struct wpabuf **out_data)
763 {
764 struct wpabuf *in_decrypted = NULL;
765 int res, skip_change = 0;
766 struct eap_hdr *hdr, *rhdr;
767 struct wpabuf *resp = NULL;
768 size_t len;
769
770 wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
771 " Phase 2", (unsigned long) wpabuf_len(in_data));
772
773 if (data->pending_phase2_req) {
774 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 request - "
775 "skip decryption and use old data");
776 /* Clear TLS reassembly state. */
777 eap_peer_tls_reset_input(&data->ssl);
778 in_decrypted = data->pending_phase2_req;
779 data->pending_phase2_req = NULL;
780 skip_change = 1;
781 goto continue_req;
782 }
783
784 if (wpabuf_len(in_data) == 0 && sm->workaround &&
785 data->phase2_success) {
786 /*
787 * Cisco ACS seems to be using TLS ACK to terminate
788 * EAP-PEAPv0/GTC. Try to reply with TLS ACK.
789 */
790 wpa_printf(MSG_DEBUG, "EAP-PEAP: Received TLS ACK, but "
791 "expected data - acknowledge with TLS ACK since "
792 "Phase 2 has been completed");
793 ret->decision = DECISION_COND_SUCC;
794 ret->methodState = METHOD_DONE;
795 return 1;
796 } else if (wpabuf_len(in_data) == 0) {
797 /* Received TLS ACK - requesting more fragments */
798 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
799 data->peap_version,
800 req->identifier, NULL, out_data);
801 }
802
803 res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
804 if (res)
805 return res;
806 if (wpabuf_len(in_decrypted) == 0) {
807 wpabuf_free(in_decrypted);
808 return 1;
809 }
810
811 continue_req:
812 wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP",
813 in_decrypted);
814
815 hdr = wpabuf_mhead(in_decrypted);
816 if (wpabuf_len(in_decrypted) == 5 && hdr->code == EAP_CODE_REQUEST &&
817 be_to_host16(hdr->length) == 5 &&
818 eap_get_type(in_decrypted) == EAP_TYPE_IDENTITY) {
819 /* At least FreeRADIUS seems to send full EAP header with
820 * EAP Request Identity */
821 skip_change = 1;
822 }
823 if (wpabuf_len(in_decrypted) >= 5 && hdr->code == EAP_CODE_REQUEST &&
824 eap_get_type(in_decrypted) == EAP_TYPE_TLV) {
825 skip_change = 1;
826 }
827
828 if (data->peap_version == 0 && !skip_change) {
829 struct eap_hdr *nhdr;
830 struct wpabuf *nmsg = wpabuf_alloc(sizeof(struct eap_hdr) +
831 wpabuf_len(in_decrypted));
832 if (nmsg == NULL) {
833 wpabuf_clear_free(in_decrypted);
834 return 0;
835 }
836 nhdr = wpabuf_put(nmsg, sizeof(*nhdr));
837 wpabuf_put_buf(nmsg, in_decrypted);
838 nhdr->code = req->code;
839 nhdr->identifier = req->identifier;
840 nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
841 wpabuf_len(in_decrypted));
842
843 wpabuf_clear_free(in_decrypted);
844 in_decrypted = nmsg;
845 }
846
847 hdr = wpabuf_mhead(in_decrypted);
848 if (wpabuf_len(in_decrypted) < sizeof(*hdr)) {
849 wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
850 "EAP frame (len=%lu)",
851 (unsigned long) wpabuf_len(in_decrypted));
852 wpabuf_clear_free(in_decrypted);
853 return 0;
854 }
855 len = be_to_host16(hdr->length);
856 if (len > wpabuf_len(in_decrypted)) {
857 wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in "
858 "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
859 (unsigned long) wpabuf_len(in_decrypted),
860 (unsigned long) len);
861 wpabuf_clear_free(in_decrypted);
862 return 0;
863 }
864 if (len < wpabuf_len(in_decrypted)) {
865 wpa_printf(MSG_INFO, "EAP-PEAP: Odd.. Phase 2 EAP header has "
866 "shorter length than full decrypted data "
867 "(%lu < %lu)",
868 (unsigned long) len,
869 (unsigned long) wpabuf_len(in_decrypted));
870 }
871 wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d "
872 "identifier=%d length=%lu", hdr->code, hdr->identifier,
873 (unsigned long) len);
874 switch (hdr->code) {
875 case EAP_CODE_REQUEST:
876 if (eap_peap_phase2_request(sm, data, ret, in_decrypted,
877 &resp)) {
878 wpabuf_clear_free(in_decrypted);
879 wpa_printf(MSG_INFO, "EAP-PEAP: Phase2 Request "
880 "processing failed");
881 return 0;
882 }
883 break;
884 case EAP_CODE_SUCCESS:
885 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success");
886 if (data->peap_version == 1) {
887 /* EAP-Success within TLS tunnel is used to indicate
888 * shutdown of the TLS channel. The authentication has
889 * been completed. */
890 if (data->phase2_eap_started &&
891 !data->phase2_eap_success) {
892 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 "
893 "Success used to indicate success, "
894 "but Phase 2 EAP was not yet "
895 "completed successfully");
896 ret->methodState = METHOD_DONE;
897 ret->decision = DECISION_FAIL;
898 wpabuf_clear_free(in_decrypted);
899 return 0;
900 }
901 wpa_printf(MSG_DEBUG, "EAP-PEAP: Version 1 - "
902 "EAP-Success within TLS tunnel - "
903 "authentication completed");
904 ret->decision = DECISION_UNCOND_SUCC;
905 ret->methodState = METHOD_DONE;
906 data->phase2_success = 1;
907 if (data->peap_outer_success == 2) {
908 wpabuf_clear_free(in_decrypted);
909 wpa_printf(MSG_DEBUG, "EAP-PEAP: Use TLS ACK "
910 "to finish authentication");
911 return 1;
912 } else if (data->peap_outer_success == 1) {
913 /* Reply with EAP-Success within the TLS
914 * channel to complete the authentication. */
915 resp = wpabuf_alloc(sizeof(struct eap_hdr));
916 if (resp) {
917 rhdr = wpabuf_put(resp, sizeof(*rhdr));
918 rhdr->code = EAP_CODE_SUCCESS;
919 rhdr->identifier = hdr->identifier;
920 rhdr->length =
921 host_to_be16(sizeof(*rhdr));
922 }
923 } else {
924 /* No EAP-Success expected for Phase 1 (outer,
925 * unencrypted auth), so force EAP state
926 * machine to SUCCESS state. */
927 sm->peap_done = true;
928 }
929 } else {
930 /* FIX: ? */
931 }
932 break;
933 case EAP_CODE_FAILURE:
934 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure");
935 ret->decision = DECISION_FAIL;
936 ret->methodState = METHOD_MAY_CONT;
937 ret->allowNotifications = false;
938 /* Reply with EAP-Failure within the TLS channel to complete
939 * failure reporting. */
940 resp = wpabuf_alloc(sizeof(struct eap_hdr));
941 if (resp) {
942 rhdr = wpabuf_put(resp, sizeof(*rhdr));
943 rhdr->code = EAP_CODE_FAILURE;
944 rhdr->identifier = hdr->identifier;
945 rhdr->length = host_to_be16(sizeof(*rhdr));
946 }
947 break;
948 default:
949 wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
950 "Phase 2 EAP header", hdr->code);
951 break;
952 }
953
954 wpabuf_clear_free(in_decrypted);
955
956 if (resp) {
957 int skip_change2 = 0;
958 struct wpabuf *rmsg, buf;
959
960 wpa_hexdump_buf_key(MSG_DEBUG,
961 "EAP-PEAP: Encrypting Phase 2 data", resp);
962 /* PEAP version changes */
963 if (wpabuf_len(resp) >= 5 &&
964 wpabuf_head_u8(resp)[0] == EAP_CODE_RESPONSE &&
965 eap_get_type(resp) == EAP_TYPE_TLV)
966 skip_change2 = 1;
967 rmsg = resp;
968 if (data->peap_version == 0 && !skip_change2) {
969 wpabuf_set(&buf, wpabuf_head_u8(resp) +
970 sizeof(struct eap_hdr),
971 wpabuf_len(resp) - sizeof(struct eap_hdr));
972 rmsg = &buf;
973 }
974
975 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
976 data->peap_version, req->identifier,
977 rmsg, out_data)) {
978 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to encrypt "
979 "a Phase 2 frame");
980 }
981 wpabuf_clear_free(resp);
982 }
983
984 return 0;
985 }
986
987
eap_peap_process(struct eap_sm * sm,void * priv,struct eap_method_ret * ret,const struct wpabuf * reqData)988 static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv,
989 struct eap_method_ret *ret,
990 const struct wpabuf *reqData)
991 {
992 const struct eap_hdr *req;
993 size_t left;
994 int res;
995 u8 flags, id;
996 struct wpabuf *resp;
997 const u8 *pos;
998 struct eap_peap_data *data = priv;
999 struct wpabuf msg;
1000
1001 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_PEAP, ret,
1002 reqData, &left, &flags);
1003 if (pos == NULL)
1004 return NULL;
1005 req = wpabuf_head(reqData);
1006 id = req->identifier;
1007
1008 if (flags & EAP_TLS_FLAGS_START) {
1009 wpa_printf(MSG_DEBUG, "EAP-PEAP: Start (server ver=%d, own "
1010 "ver=%d)", flags & EAP_TLS_VERSION_MASK,
1011 data->peap_version);
1012 if ((flags & EAP_TLS_VERSION_MASK) < data->peap_version)
1013 data->peap_version = flags & EAP_TLS_VERSION_MASK;
1014 if (data->force_peap_version >= 0 &&
1015 data->force_peap_version != data->peap_version) {
1016 wpa_printf(MSG_WARNING, "EAP-PEAP: Failed to select "
1017 "forced PEAP version %d",
1018 data->force_peap_version);
1019 ret->methodState = METHOD_DONE;
1020 ret->decision = DECISION_FAIL;
1021 ret->allowNotifications = false;
1022 return NULL;
1023 }
1024 wpa_printf(MSG_DEBUG, "EAP-PEAP: Using PEAP version %d",
1025 data->peap_version);
1026 left = 0; /* make sure that this frame is empty, even though it
1027 * should always be, anyway */
1028 }
1029
1030 wpabuf_set(&msg, pos, left);
1031
1032 resp = NULL;
1033 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1034 !data->resuming) {
1035 res = eap_peap_decrypt(sm, data, ret, req, &msg, &resp);
1036 } else {
1037 if (sm->waiting_ext_cert_check && data->pending_resp) {
1038 struct eap_peer_config *config = eap_get_config(sm);
1039
1040 if (config->pending_ext_cert_check ==
1041 EXT_CERT_CHECK_GOOD) {
1042 wpa_printf(MSG_DEBUG,
1043 "EAP-PEAP: External certificate check succeeded - continue handshake");
1044 resp = data->pending_resp;
1045 data->pending_resp = NULL;
1046 sm->waiting_ext_cert_check = 0;
1047 return resp;
1048 }
1049
1050 if (config->pending_ext_cert_check ==
1051 EXT_CERT_CHECK_BAD) {
1052 wpa_printf(MSG_DEBUG,
1053 "EAP-PEAP: External certificate check failed - force authentication failure");
1054 ret->methodState = METHOD_DONE;
1055 ret->decision = DECISION_FAIL;
1056 sm->waiting_ext_cert_check = 0;
1057 return NULL;
1058 }
1059
1060 wpa_printf(MSG_DEBUG,
1061 "EAP-PEAP: Continuing to wait external server certificate validation");
1062 return NULL;
1063 }
1064
1065 res = eap_peer_tls_process_helper(sm, &data->ssl,
1066 EAP_TYPE_PEAP,
1067 data->peap_version, id, &msg,
1068 &resp);
1069
1070 if (res < 0) {
1071 wpa_printf(MSG_DEBUG,
1072 "EAP-PEAP: TLS processing failed");
1073 ret->methodState = METHOD_DONE;
1074 ret->decision = DECISION_FAIL;
1075 return resp;
1076 }
1077
1078
1079 if (sm->waiting_ext_cert_check) {
1080 wpa_printf(MSG_DEBUG,
1081 "EAP-PEAP: Waiting external server certificate validation");
1082 wpabuf_clear_free(data->pending_resp);
1083 data->pending_resp = resp;
1084 return NULL;
1085 }
1086
1087 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1088 const char *label;
1089 const u8 eap_tls13_context[1] = { EAP_TYPE_PEAP };
1090 const u8 *context = NULL;
1091 size_t context_len = 0;
1092
1093 wpa_printf(MSG_DEBUG,
1094 "EAP-PEAP: TLS done, proceed to Phase 2");
1095 eap_peap_free_key(data);
1096 /* draft-josefsson-ppext-eap-tls-eap-05.txt
1097 * specifies that PEAPv1 would use "client PEAP
1098 * encryption" as the label. However, most existing
1099 * PEAPv1 implementations seem to be using the old
1100 * label, "client EAP encryption", instead. Use the old
1101 * label by default, but allow it to be configured with
1102 * phase1 parameter peaplabel=1.
1103 *
1104 * When using TLS 1.3, draft-ietf-emu-tls-eap-types
1105 * defines a new set of label and context parameters.
1106 */
1107 if (data->ssl.tls_v13) {
1108 label = "EXPORTER_EAP_TLS_Key_Material";
1109 context = eap_tls13_context;
1110 context_len = sizeof(eap_tls13_context);
1111 } else if (data->force_new_label) {
1112 label = "client PEAP encryption";
1113 } else {
1114 label = "client EAP encryption";
1115 }
1116 wpa_printf(MSG_DEBUG, "EAP-PEAP: using label '%s' in "
1117 "key derivation", label);
1118 data->key_data =
1119 eap_peer_tls_derive_key(sm, &data->ssl, label,
1120 context, context_len,
1121 EAP_TLS_KEY_LEN +
1122 EAP_EMSK_LEN);
1123 if (data->key_data) {
1124 wpa_hexdump_key(MSG_DEBUG,
1125 "EAP-PEAP: Derived key",
1126 data->key_data,
1127 EAP_TLS_KEY_LEN);
1128 wpa_hexdump_key(MSG_DEBUG,
1129 "EAP-PEAP: Derived EMSK",
1130 data->key_data +
1131 EAP_TLS_KEY_LEN,
1132 EAP_EMSK_LEN);
1133 } else {
1134 wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to "
1135 "derive key");
1136 }
1137
1138 os_free(data->session_id);
1139 data->session_id =
1140 eap_peer_tls_derive_session_id(sm, &data->ssl,
1141 EAP_TYPE_PEAP,
1142 &data->id_len);
1143 if (data->session_id) {
1144 wpa_hexdump(MSG_DEBUG,
1145 "EAP-PEAP: Derived Session-Id",
1146 data->session_id, data->id_len);
1147 } else {
1148 wpa_printf(MSG_ERROR, "EAP-PEAP: Failed to "
1149 "derive Session-Id");
1150 }
1151
1152 if (sm->workaround && data->resuming) {
1153 /*
1154 * At least few RADIUS servers (Aegis v1.1.6;
1155 * but not v1.1.4; and Cisco ACS) seem to be
1156 * terminating PEAPv1 (Aegis) or PEAPv0 (Cisco
1157 * ACS) session resumption with outer
1158 * EAP-Success. This does not seem to follow
1159 * draft-josefsson-pppext-eap-tls-eap-05.txt
1160 * section 4.2, so only allow this if EAP
1161 * workarounds are enabled.
1162 */
1163 wpa_printf(MSG_DEBUG, "EAP-PEAP: Workaround - "
1164 "allow outer EAP-Success to "
1165 "terminate PEAP resumption");
1166 ret->decision = DECISION_COND_SUCC;
1167 data->phase2_success = 1;
1168 }
1169
1170 data->resuming = 0;
1171 }
1172
1173 if (res == 2) {
1174 /*
1175 * Application data included in the handshake message.
1176 */
1177 wpabuf_clear_free(data->pending_phase2_req);
1178 data->pending_phase2_req = resp;
1179 resp = NULL;
1180 res = eap_peap_decrypt(sm, data, ret, req, &msg,
1181 &resp);
1182 }
1183 }
1184
1185 if (ret->methodState == METHOD_DONE) {
1186 ret->allowNotifications = false;
1187 }
1188
1189 if (res == 1) {
1190 wpabuf_clear_free(resp);
1191 return eap_peer_tls_build_ack(id, EAP_TYPE_PEAP,
1192 data->peap_version);
1193 }
1194
1195 return resp;
1196 }
1197
1198
eap_peap_has_reauth_data(struct eap_sm * sm,void * priv)1199 static bool eap_peap_has_reauth_data(struct eap_sm *sm, void *priv)
1200 {
1201 struct eap_peap_data *data = priv;
1202 return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1203 data->phase2_success;
1204 }
1205
1206
eap_peap_deinit_for_reauth(struct eap_sm * sm,void * priv)1207 static void eap_peap_deinit_for_reauth(struct eap_sm *sm, void *priv)
1208 {
1209 struct eap_peap_data *data = priv;
1210
1211 if (data->phase2_priv && data->phase2_method &&
1212 data->phase2_method->deinit_for_reauth)
1213 data->phase2_method->deinit_for_reauth(sm, data->phase2_priv);
1214 wpabuf_clear_free(data->pending_phase2_req);
1215 data->pending_phase2_req = NULL;
1216 wpabuf_clear_free(data->pending_resp);
1217 data->pending_resp = NULL;
1218 data->crypto_binding_used = 0;
1219 }
1220
1221
eap_peap_init_for_reauth(struct eap_sm * sm,void * priv)1222 static void * eap_peap_init_for_reauth(struct eap_sm *sm, void *priv)
1223 {
1224 struct eap_peap_data *data = priv;
1225 eap_peap_free_key(data);
1226 os_free(data->session_id);
1227 data->session_id = NULL;
1228 if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1229 os_free(data);
1230 return NULL;
1231 }
1232 if (data->phase2_priv && data->phase2_method &&
1233 data->phase2_method->init_for_reauth)
1234 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1235 data->phase2_success = 0;
1236 data->phase2_eap_success = 0;
1237 data->phase2_eap_started = 0;
1238 data->resuming = 1;
1239 data->reauth = 1;
1240 sm->peap_done = false;
1241 return priv;
1242 }
1243
1244
eap_peap_get_status(struct eap_sm * sm,void * priv,char * buf,size_t buflen,int verbose)1245 static int eap_peap_get_status(struct eap_sm *sm, void *priv, char *buf,
1246 size_t buflen, int verbose)
1247 {
1248 struct eap_peap_data *data = priv;
1249 int len, ret;
1250
1251 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1252 if (data->phase2_method) {
1253 ret = os_snprintf(buf + len, buflen - len,
1254 "EAP-PEAPv%d Phase2 method=%s\n",
1255 data->peap_version,
1256 data->phase2_method->name);
1257 if (os_snprintf_error(buflen - len, ret))
1258 return len;
1259 len += ret;
1260 }
1261 return len;
1262 }
1263
1264
eap_peap_isKeyAvailable(struct eap_sm * sm,void * priv)1265 static bool eap_peap_isKeyAvailable(struct eap_sm *sm, void *priv)
1266 {
1267 struct eap_peap_data *data = priv;
1268 return data->key_data != NULL && data->phase2_success;
1269 }
1270
1271
eap_peap_getKey(struct eap_sm * sm,void * priv,size_t * len)1272 static u8 * eap_peap_getKey(struct eap_sm *sm, void *priv, size_t *len)
1273 {
1274 struct eap_peap_data *data = priv;
1275 u8 *key;
1276
1277 if (data->key_data == NULL || !data->phase2_success)
1278 return NULL;
1279
1280 key = os_malloc(EAP_TLS_KEY_LEN);
1281 if (key == NULL)
1282 return NULL;
1283
1284 *len = EAP_TLS_KEY_LEN;
1285
1286 if (data->crypto_binding_used) {
1287 u8 csk[128];
1288 /*
1289 * Note: It looks like Microsoft implementation requires null
1290 * termination for this label while the one used for deriving
1291 * IPMK|CMK did not use null termination.
1292 */
1293 if (peap_prfplus(data->peap_version, data->ipmk, 40,
1294 "Session Key Generating Function",
1295 (u8 *) "\00", 1, csk, sizeof(csk)) < 0) {
1296 os_free(key);
1297 return NULL;
1298 }
1299 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk));
1300 os_memcpy(key, csk, EAP_TLS_KEY_LEN);
1301 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
1302 key, EAP_TLS_KEY_LEN);
1303 forced_memzero(csk, sizeof(csk));
1304 } else
1305 os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
1306
1307 return key;
1308 }
1309
1310
eap_peap_get_emsk(struct eap_sm * sm,void * priv,size_t * len)1311 static u8 * eap_peap_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1312 {
1313 struct eap_peap_data *data = priv;
1314 u8 *key;
1315
1316 if (!data->key_data || !data->phase2_success)
1317 return NULL;
1318
1319 if (data->crypto_binding_used) {
1320 /* [MS-PEAP] does not define EMSK derivation */
1321 return NULL;
1322 }
1323
1324 key = os_memdup(data->key_data + EAP_TLS_KEY_LEN, EAP_EMSK_LEN);
1325 if (!key)
1326 return NULL;
1327
1328 *len = EAP_EMSK_LEN;
1329
1330 return key;
1331 }
1332
1333
eap_peap_get_session_id(struct eap_sm * sm,void * priv,size_t * len)1334 static u8 * eap_peap_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1335 {
1336 struct eap_peap_data *data = priv;
1337 u8 *id;
1338
1339 if (data->session_id == NULL || !data->phase2_success)
1340 return NULL;
1341
1342 id = os_memdup(data->session_id, data->id_len);
1343 if (id == NULL)
1344 return NULL;
1345
1346 *len = data->id_len;
1347
1348 return id;
1349 }
1350
1351
eap_peer_peap_register(void)1352 int eap_peer_peap_register(void)
1353 {
1354 struct eap_method *eap;
1355
1356 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1357 EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP");
1358 if (eap == NULL)
1359 return -1;
1360
1361 eap->init = eap_peap_init;
1362 eap->deinit = eap_peap_deinit;
1363 eap->process = eap_peap_process;
1364 eap->isKeyAvailable = eap_peap_isKeyAvailable;
1365 eap->getKey = eap_peap_getKey;
1366 eap->get_emsk = eap_peap_get_emsk;
1367 eap->get_status = eap_peap_get_status;
1368 eap->has_reauth_data = eap_peap_has_reauth_data;
1369 eap->deinit_for_reauth = eap_peap_deinit_for_reauth;
1370 eap->init_for_reauth = eap_peap_init_for_reauth;
1371 eap->getSessionId = eap_peap_get_session_id;
1372
1373 return eap_peer_method_register(eap);
1374 }
1375
