xref: /freebsd/contrib/wpa/src/eap_peer/eap_peap.c (revision 6472ac3d8a86336899b6cfb789a4cd9897e3fab5)
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 program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License version 2 as
7  * published by the Free Software Foundation.
8  *
9  * Alternatively, this software may be distributed under the terms of BSD
10  * license.
11  *
12  * See README and COPYING for more details.
13  */
14 
15 #include "includes.h"
16 
17 #include "common.h"
18 #include "crypto/sha1.h"
19 #include "crypto/tls.h"
20 #include "eap_common/eap_tlv_common.h"
21 #include "eap_common/eap_peap_common.h"
22 #include "eap_i.h"
23 #include "eap_tls_common.h"
24 #include "eap_config.h"
25 #include "tncc.h"
26 
27 
28 /* Maximum supported PEAP version
29  * 0 = Microsoft's PEAP version 0; draft-kamath-pppext-peapv0-00.txt
30  * 1 = draft-josefsson-ppext-eap-tls-eap-05.txt
31  * 2 = draft-josefsson-ppext-eap-tls-eap-10.txt
32  */
33 #define EAP_PEAP_VERSION 1
34 
35 
36 static void eap_peap_deinit(struct eap_sm *sm, void *priv);
37 
38 
39 struct eap_peap_data {
40 	struct eap_ssl_data ssl;
41 
42 	int peap_version, force_peap_version, force_new_label;
43 
44 	const struct eap_method *phase2_method;
45 	void *phase2_priv;
46 	int phase2_success;
47 	int phase2_eap_success;
48 	int phase2_eap_started;
49 
50 	struct eap_method_type phase2_type;
51 	struct eap_method_type *phase2_types;
52 	size_t num_phase2_types;
53 
54 	int peap_outer_success; /* 0 = PEAP terminated on Phase 2 inner
55 				 * EAP-Success
56 				 * 1 = reply with tunneled EAP-Success to inner
57 				 * EAP-Success and expect AS to send outer
58 				 * (unencrypted) EAP-Success after this
59 				 * 2 = reply with PEAP/TLS ACK to inner
60 				 * EAP-Success and expect AS to send outer
61 				 * (unencrypted) EAP-Success after this */
62 	int resuming; /* starting a resumed session */
63 	int reauth; /* reauthentication */
64 	u8 *key_data;
65 
66 	struct wpabuf *pending_phase2_req;
67 	enum { NO_BINDING, OPTIONAL_BINDING, REQUIRE_BINDING } crypto_binding;
68 	int crypto_binding_used;
69 	u8 binding_nonce[32];
70 	u8 ipmk[40];
71 	u8 cmk[20];
72 	int soh; /* Whether IF-TNCCS-SOH (Statement of Health; Microsoft NAP)
73 		  * is enabled. */
74 };
75 
76 
77 static int eap_peap_parse_phase1(struct eap_peap_data *data,
78 				 const char *phase1)
79 {
80 	const char *pos;
81 
82 	pos = os_strstr(phase1, "peapver=");
83 	if (pos) {
84 		data->force_peap_version = atoi(pos + 8);
85 		data->peap_version = data->force_peap_version;
86 		wpa_printf(MSG_DEBUG, "EAP-PEAP: Forced PEAP version %d",
87 			   data->force_peap_version);
88 	}
89 
90 	if (os_strstr(phase1, "peaplabel=1")) {
91 		data->force_new_label = 1;
92 		wpa_printf(MSG_DEBUG, "EAP-PEAP: Force new label for key "
93 			   "derivation");
94 	}
95 
96 	if (os_strstr(phase1, "peap_outer_success=0")) {
97 		data->peap_outer_success = 0;
98 		wpa_printf(MSG_DEBUG, "EAP-PEAP: terminate authentication on "
99 			   "tunneled EAP-Success");
100 	} else if (os_strstr(phase1, "peap_outer_success=1")) {
101 		data->peap_outer_success = 1;
102 		wpa_printf(MSG_DEBUG, "EAP-PEAP: send tunneled EAP-Success "
103 			   "after receiving tunneled EAP-Success");
104 	} else if (os_strstr(phase1, "peap_outer_success=2")) {
105 		data->peap_outer_success = 2;
106 		wpa_printf(MSG_DEBUG, "EAP-PEAP: send PEAP/TLS ACK after "
107 			   "receiving tunneled EAP-Success");
108 	}
109 
110 	if (os_strstr(phase1, "crypto_binding=0")) {
111 		data->crypto_binding = NO_BINDING;
112 		wpa_printf(MSG_DEBUG, "EAP-PEAP: Do not use cryptobinding");
113 	} else if (os_strstr(phase1, "crypto_binding=1")) {
114 		data->crypto_binding = OPTIONAL_BINDING;
115 		wpa_printf(MSG_DEBUG, "EAP-PEAP: Optional cryptobinding");
116 	} else if (os_strstr(phase1, "crypto_binding=2")) {
117 		data->crypto_binding = REQUIRE_BINDING;
118 		wpa_printf(MSG_DEBUG, "EAP-PEAP: Require cryptobinding");
119 	}
120 
121 #ifdef EAP_TNC
122 	if (os_strstr(phase1, "tnc=soh2")) {
123 		data->soh = 2;
124 		wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled");
125 	} else if (os_strstr(phase1, "tnc=soh1")) {
126 		data->soh = 1;
127 		wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 1 enabled");
128 	} else if (os_strstr(phase1, "tnc=soh")) {
129 		data->soh = 2;
130 		wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled");
131 	}
132 #endif /* EAP_TNC */
133 
134 	return 0;
135 }
136 
137 
138 static void * eap_peap_init(struct eap_sm *sm)
139 {
140 	struct eap_peap_data *data;
141 	struct eap_peer_config *config = eap_get_config(sm);
142 
143 	data = os_zalloc(sizeof(*data));
144 	if (data == NULL)
145 		return NULL;
146 	sm->peap_done = FALSE;
147 	data->peap_version = EAP_PEAP_VERSION;
148 	data->force_peap_version = -1;
149 	data->peap_outer_success = 2;
150 	data->crypto_binding = OPTIONAL_BINDING;
151 
152 	if (config && config->phase1 &&
153 	    eap_peap_parse_phase1(data, config->phase1) < 0) {
154 		eap_peap_deinit(sm, data);
155 		return NULL;
156 	}
157 
158 	if (eap_peer_select_phase2_methods(config, "auth=",
159 					   &data->phase2_types,
160 					   &data->num_phase2_types) < 0) {
161 		eap_peap_deinit(sm, data);
162 		return NULL;
163 	}
164 
165 	data->phase2_type.vendor = EAP_VENDOR_IETF;
166 	data->phase2_type.method = EAP_TYPE_NONE;
167 
168 	if (eap_peer_tls_ssl_init(sm, &data->ssl, config)) {
169 		wpa_printf(MSG_INFO, "EAP-PEAP: Failed to initialize SSL.");
170 		eap_peap_deinit(sm, data);
171 		return NULL;
172 	}
173 
174 	return data;
175 }
176 
177 
178 static void eap_peap_deinit(struct eap_sm *sm, void *priv)
179 {
180 	struct eap_peap_data *data = priv;
181 	if (data == NULL)
182 		return;
183 	if (data->phase2_priv && data->phase2_method)
184 		data->phase2_method->deinit(sm, data->phase2_priv);
185 	os_free(data->phase2_types);
186 	eap_peer_tls_ssl_deinit(sm, &data->ssl);
187 	os_free(data->key_data);
188 	wpabuf_free(data->pending_phase2_req);
189 	os_free(data);
190 }
191 
192 
193 /**
194  * eap_tlv_build_nak - Build EAP-TLV NAK message
195  * @id: EAP identifier for the header
196  * @nak_type: TLV type (EAP_TLV_*)
197  * Returns: Buffer to the allocated EAP-TLV NAK message or %NULL on failure
198  *
199  * This funtion builds an EAP-TLV NAK message. The caller is responsible for
200  * freeing the returned buffer.
201  */
202 static struct wpabuf * eap_tlv_build_nak(int id, u16 nak_type)
203 {
204 	struct wpabuf *msg;
205 
206 	msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, 10,
207 			    EAP_CODE_RESPONSE, id);
208 	if (msg == NULL)
209 		return NULL;
210 
211 	wpabuf_put_u8(msg, 0x80); /* Mandatory */
212 	wpabuf_put_u8(msg, EAP_TLV_NAK_TLV);
213 	wpabuf_put_be16(msg, 6); /* Length */
214 	wpabuf_put_be32(msg, 0); /* Vendor-Id */
215 	wpabuf_put_be16(msg, nak_type); /* NAK-Type */
216 
217 	return msg;
218 }
219 
220 
221 static int eap_peap_get_isk(struct eap_sm *sm, struct eap_peap_data *data,
222 			    u8 *isk, size_t isk_len)
223 {
224 	u8 *key;
225 	size_t key_len;
226 
227 	os_memset(isk, 0, isk_len);
228 	if (data->phase2_method == NULL || data->phase2_priv == NULL ||
229 	    data->phase2_method->isKeyAvailable == NULL ||
230 	    data->phase2_method->getKey == NULL)
231 		return 0;
232 
233 	if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
234 	    (key = data->phase2_method->getKey(sm, data->phase2_priv,
235 					       &key_len)) == NULL) {
236 		wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not get key material "
237 			   "from Phase 2");
238 		return -1;
239 	}
240 
241 	if (key_len > isk_len)
242 		key_len = isk_len;
243 	os_memcpy(isk, key, key_len);
244 	os_free(key);
245 
246 	return 0;
247 }
248 
249 
250 static int eap_peap_derive_cmk(struct eap_sm *sm, struct eap_peap_data *data)
251 {
252 	u8 *tk;
253 	u8 isk[32], imck[60];
254 
255 	/*
256 	 * Tunnel key (TK) is the first 60 octets of the key generated by
257 	 * phase 1 of PEAP (based on TLS).
258 	 */
259 	tk = data->key_data;
260 	if (tk == NULL)
261 		return -1;
262 	wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TK", tk, 60);
263 
264 	if (data->reauth &&
265 	    tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) {
266 		/* Fast-connect: IPMK|CMK = TK */
267 		os_memcpy(data->ipmk, tk, 40);
268 		wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK from TK",
269 				data->ipmk, 40);
270 		os_memcpy(data->cmk, tk + 40, 20);
271 		wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK from TK",
272 				data->cmk, 20);
273 		return 0;
274 	}
275 
276 	if (eap_peap_get_isk(sm, data, isk, sizeof(isk)) < 0)
277 		return -1;
278 	wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: ISK", isk, sizeof(isk));
279 
280 	/*
281 	 * IPMK Seed = "Inner Methods Compound Keys" | ISK
282 	 * TempKey = First 40 octets of TK
283 	 * IPMK|CMK = PRF+(TempKey, IPMK Seed, 60)
284 	 * (note: draft-josefsson-pppext-eap-tls-eap-10.txt includes a space
285 	 * in the end of the label just before ISK; is that just a typo?)
286 	 */
287 	wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TempKey", tk, 40);
288 	peap_prfplus(data->peap_version, tk, 40, "Inner Methods Compound Keys",
289 		     isk, sizeof(isk), imck, sizeof(imck));
290 	wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IMCK (IPMKj)",
291 			imck, sizeof(imck));
292 
293 	os_memcpy(data->ipmk, imck, 40);
294 	wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK (S-IPMKj)", data->ipmk, 40);
295 	os_memcpy(data->cmk, imck + 40, 20);
296 	wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK (CMKj)", data->cmk, 20);
297 
298 	return 0;
299 }
300 
301 
302 static int eap_tlv_add_cryptobinding(struct eap_sm *sm,
303 				     struct eap_peap_data *data,
304 				     struct wpabuf *buf)
305 {
306 	u8 *mac;
307 	u8 eap_type = EAP_TYPE_PEAP;
308 	const u8 *addr[2];
309 	size_t len[2];
310 	u16 tlv_type;
311 
312 	/* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
313 	addr[0] = wpabuf_put(buf, 0);
314 	len[0] = 60;
315 	addr[1] = &eap_type;
316 	len[1] = 1;
317 
318 	tlv_type = EAP_TLV_CRYPTO_BINDING_TLV;
319 	if (data->peap_version >= 2)
320 		tlv_type |= EAP_TLV_TYPE_MANDATORY;
321 	wpabuf_put_be16(buf, tlv_type);
322 	wpabuf_put_be16(buf, 56);
323 
324 	wpabuf_put_u8(buf, 0); /* Reserved */
325 	wpabuf_put_u8(buf, data->peap_version); /* Version */
326 	wpabuf_put_u8(buf, data->peap_version); /* RecvVersion */
327 	wpabuf_put_u8(buf, 1); /* SubType: 0 = Request, 1 = Response */
328 	wpabuf_put_data(buf, data->binding_nonce, 32); /* Nonce */
329 	mac = wpabuf_put(buf, 20); /* Compound_MAC */
330 	wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC CMK", data->cmk, 20);
331 	wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 1",
332 		    addr[0], len[0]);
333 	wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 2",
334 		    addr[1], len[1]);
335 	hmac_sha1_vector(data->cmk, 20, 2, addr, len, mac);
336 	wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC", mac, SHA1_MAC_LEN);
337 	data->crypto_binding_used = 1;
338 
339 	return 0;
340 }
341 
342 
343 /**
344  * eap_tlv_build_result - Build EAP-TLV Result message
345  * @id: EAP identifier for the header
346  * @status: Status (EAP_TLV_RESULT_SUCCESS or EAP_TLV_RESULT_FAILURE)
347  * Returns: Buffer to the allocated EAP-TLV Result message or %NULL on failure
348  *
349  * This funtion builds an EAP-TLV Result message. The caller is responsible for
350  * freeing the returned buffer.
351  */
352 static struct wpabuf * eap_tlv_build_result(struct eap_sm *sm,
353 					    struct eap_peap_data *data,
354 					    int crypto_tlv_used,
355 					    int id, u16 status)
356 {
357 	struct wpabuf *msg;
358 	size_t len;
359 
360 	if (data->crypto_binding == NO_BINDING)
361 		crypto_tlv_used = 0;
362 
363 	len = 6;
364 	if (crypto_tlv_used)
365 		len += 60; /* Cryptobinding TLV */
366 	msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, len,
367 			    EAP_CODE_RESPONSE, id);
368 	if (msg == NULL)
369 		return NULL;
370 
371 	wpabuf_put_u8(msg, 0x80); /* Mandatory */
372 	wpabuf_put_u8(msg, EAP_TLV_RESULT_TLV);
373 	wpabuf_put_be16(msg, 2); /* Length */
374 	wpabuf_put_be16(msg, status); /* Status */
375 
376 	if (crypto_tlv_used && eap_tlv_add_cryptobinding(sm, data, msg)) {
377 		wpabuf_free(msg);
378 		return NULL;
379 	}
380 
381 	return msg;
382 }
383 
384 
385 static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
386 					  struct eap_peap_data *data,
387 					  const u8 *crypto_tlv,
388 					  size_t crypto_tlv_len)
389 {
390 	u8 buf[61], mac[SHA1_MAC_LEN];
391 	const u8 *pos;
392 
393 	if (eap_peap_derive_cmk(sm, data) < 0) {
394 		wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not derive CMK");
395 		return -1;
396 	}
397 
398 	if (crypto_tlv_len != 4 + 56) {
399 		wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid cryptobinding TLV "
400 			   "length %d", (int) crypto_tlv_len);
401 		return -1;
402 	}
403 
404 	pos = crypto_tlv;
405 	pos += 4; /* TLV header */
406 	if (pos[1] != data->peap_version) {
407 		wpa_printf(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV Version "
408 			   "mismatch (was %d; expected %d)",
409 			   pos[1], data->peap_version);
410 		return -1;
411 	}
412 
413 	if (pos[3] != 0) {
414 		wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV "
415 			   "SubType %d", pos[3]);
416 		return -1;
417 	}
418 	pos += 4;
419 	os_memcpy(data->binding_nonce, pos, 32);
420 	pos += 32; /* Nonce */
421 
422 	/* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
423 	os_memcpy(buf, crypto_tlv, 60);
424 	os_memset(buf + 4 + 4 + 32, 0, 20); /* Compound_MAC */
425 	buf[60] = EAP_TYPE_PEAP;
426 	wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Compound_MAC data",
427 		    buf, sizeof(buf));
428 	hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);
429 
430 	if (os_memcmp(mac, pos, SHA1_MAC_LEN) != 0) {
431 		wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
432 			   "cryptobinding TLV");
433 		wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received MAC",
434 			    pos, SHA1_MAC_LEN);
435 		wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Expected MAC",
436 			    mac, SHA1_MAC_LEN);
437 		return -1;
438 	}
439 
440 	wpa_printf(MSG_DEBUG, "EAP-PEAP: Valid cryptobinding TLV received");
441 
442 	return 0;
443 }
444 
445 
446 /**
447  * eap_tlv_process - Process a received EAP-TLV message and generate a response
448  * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
449  * @ret: Return values from EAP request validation and processing
450  * @req: EAP-TLV request to be processed. The caller must have validated that
451  * the buffer is large enough to contain full request (hdr->length bytes) and
452  * that the EAP type is EAP_TYPE_TLV.
453  * @resp: Buffer to return a pointer to the allocated response message. This
454  * field should be initialized to %NULL before the call. The value will be
455  * updated if a response message is generated. The caller is responsible for
456  * freeing the allocated message.
457  * @force_failure: Force negotiation to fail
458  * Returns: 0 on success, -1 on failure
459  */
460 static int eap_tlv_process(struct eap_sm *sm, struct eap_peap_data *data,
461 			   struct eap_method_ret *ret,
462 			   const struct wpabuf *req, struct wpabuf **resp,
463 			   int force_failure)
464 {
465 	size_t left, tlv_len;
466 	const u8 *pos;
467 	const u8 *result_tlv = NULL, *crypto_tlv = NULL;
468 	size_t result_tlv_len = 0, crypto_tlv_len = 0;
469 	int tlv_type, mandatory;
470 
471 	/* Parse TLVs */
472 	pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, req, &left);
473 	if (pos == NULL)
474 		return -1;
475 	wpa_hexdump(MSG_DEBUG, "EAP-TLV: Received TLVs", pos, left);
476 	while (left >= 4) {
477 		mandatory = !!(pos[0] & 0x80);
478 		tlv_type = WPA_GET_BE16(pos) & 0x3fff;
479 		pos += 2;
480 		tlv_len = WPA_GET_BE16(pos);
481 		pos += 2;
482 		left -= 4;
483 		if (tlv_len > left) {
484 			wpa_printf(MSG_DEBUG, "EAP-TLV: TLV underrun "
485 				   "(tlv_len=%lu left=%lu)",
486 				   (unsigned long) tlv_len,
487 				   (unsigned long) left);
488 			return -1;
489 		}
490 		switch (tlv_type) {
491 		case EAP_TLV_RESULT_TLV:
492 			result_tlv = pos;
493 			result_tlv_len = tlv_len;
494 			break;
495 		case EAP_TLV_CRYPTO_BINDING_TLV:
496 			crypto_tlv = pos;
497 			crypto_tlv_len = tlv_len;
498 			break;
499 		default:
500 			wpa_printf(MSG_DEBUG, "EAP-TLV: Unsupported TLV Type "
501 				   "%d%s", tlv_type,
502 				   mandatory ? " (mandatory)" : "");
503 			if (mandatory) {
504 				/* NAK TLV and ignore all TLVs in this packet.
505 				 */
506 				*resp = eap_tlv_build_nak(eap_get_id(req),
507 							  tlv_type);
508 				return *resp == NULL ? -1 : 0;
509 			}
510 			/* Ignore this TLV, but process other TLVs */
511 			break;
512 		}
513 
514 		pos += tlv_len;
515 		left -= tlv_len;
516 	}
517 	if (left) {
518 		wpa_printf(MSG_DEBUG, "EAP-TLV: Last TLV too short in "
519 			   "Request (left=%lu)", (unsigned long) left);
520 		return -1;
521 	}
522 
523 	/* Process supported TLVs */
524 	if (crypto_tlv && data->crypto_binding != NO_BINDING) {
525 		wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV",
526 			    crypto_tlv, crypto_tlv_len);
527 		if (eap_tlv_validate_cryptobinding(sm, data, crypto_tlv - 4,
528 						   crypto_tlv_len + 4) < 0) {
529 			if (result_tlv == NULL)
530 				return -1;
531 			force_failure = 1;
532 			crypto_tlv = NULL; /* do not include Cryptobinding TLV
533 					    * in response, if the received
534 					    * cryptobinding was invalid. */
535 		}
536 	} else if (!crypto_tlv && data->crypto_binding == REQUIRE_BINDING) {
537 		wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV");
538 		return -1;
539 	}
540 
541 	if (result_tlv) {
542 		int status, resp_status;
543 		wpa_hexdump(MSG_DEBUG, "EAP-TLV: Result TLV",
544 			    result_tlv, result_tlv_len);
545 		if (result_tlv_len < 2) {
546 			wpa_printf(MSG_INFO, "EAP-TLV: Too short Result TLV "
547 				   "(len=%lu)",
548 				   (unsigned long) result_tlv_len);
549 			return -1;
550 		}
551 		status = WPA_GET_BE16(result_tlv);
552 		if (status == EAP_TLV_RESULT_SUCCESS) {
553 			wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Success "
554 				   "- EAP-TLV/Phase2 Completed");
555 			if (force_failure) {
556 				wpa_printf(MSG_INFO, "EAP-TLV: Earlier failure"
557 					   " - force failed Phase 2");
558 				resp_status = EAP_TLV_RESULT_FAILURE;
559 				ret->decision = DECISION_FAIL;
560 			} else {
561 				resp_status = EAP_TLV_RESULT_SUCCESS;
562 				ret->decision = DECISION_UNCOND_SUCC;
563 			}
564 		} else if (status == EAP_TLV_RESULT_FAILURE) {
565 			wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Failure");
566 			resp_status = EAP_TLV_RESULT_FAILURE;
567 			ret->decision = DECISION_FAIL;
568 		} else {
569 			wpa_printf(MSG_INFO, "EAP-TLV: Unknown TLV Result "
570 				   "Status %d", status);
571 			resp_status = EAP_TLV_RESULT_FAILURE;
572 			ret->decision = DECISION_FAIL;
573 		}
574 		ret->methodState = METHOD_DONE;
575 
576 		*resp = eap_tlv_build_result(sm, data, crypto_tlv != NULL,
577 					     eap_get_id(req), resp_status);
578 	}
579 
580 	return 0;
581 }
582 
583 
584 static struct wpabuf * eap_peapv2_tlv_eap_payload(struct wpabuf *buf)
585 {
586 	struct wpabuf *e;
587 	struct eap_tlv_hdr *tlv;
588 
589 	if (buf == NULL)
590 		return NULL;
591 
592 	/* Encapsulate EAP packet in EAP-Payload TLV */
593 	wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Add EAP-Payload TLV");
594 	e = wpabuf_alloc(sizeof(*tlv) + wpabuf_len(buf));
595 	if (e == NULL) {
596 		wpa_printf(MSG_DEBUG, "EAP-PEAPv2: Failed to allocate memory "
597 			   "for TLV encapsulation");
598 		wpabuf_free(buf);
599 		return NULL;
600 	}
601 	tlv = wpabuf_put(e, sizeof(*tlv));
602 	tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
603 				     EAP_TLV_EAP_PAYLOAD_TLV);
604 	tlv->length = host_to_be16(wpabuf_len(buf));
605 	wpabuf_put_buf(e, buf);
606 	wpabuf_free(buf);
607 	return e;
608 }
609 
610 
611 static int eap_peap_phase2_request(struct eap_sm *sm,
612 				   struct eap_peap_data *data,
613 				   struct eap_method_ret *ret,
614 				   struct wpabuf *req,
615 				   struct wpabuf **resp)
616 {
617 	struct eap_hdr *hdr = wpabuf_mhead(req);
618 	size_t len = be_to_host16(hdr->length);
619 	u8 *pos;
620 	struct eap_method_ret iret;
621 	struct eap_peer_config *config = eap_get_config(sm);
622 
623 	if (len <= sizeof(struct eap_hdr)) {
624 		wpa_printf(MSG_INFO, "EAP-PEAP: too short "
625 			   "Phase 2 request (len=%lu)", (unsigned long) len);
626 		return -1;
627 	}
628 	pos = (u8 *) (hdr + 1);
629 	wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Request: type=%d", *pos);
630 	switch (*pos) {
631 	case EAP_TYPE_IDENTITY:
632 		*resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
633 		break;
634 	case EAP_TYPE_TLV:
635 		os_memset(&iret, 0, sizeof(iret));
636 		if (eap_tlv_process(sm, data, &iret, req, resp,
637 				    data->phase2_eap_started &&
638 				    !data->phase2_eap_success)) {
639 			ret->methodState = METHOD_DONE;
640 			ret->decision = DECISION_FAIL;
641 			return -1;
642 		}
643 		if (iret.methodState == METHOD_DONE ||
644 		    iret.methodState == METHOD_MAY_CONT) {
645 			ret->methodState = iret.methodState;
646 			ret->decision = iret.decision;
647 			data->phase2_success = 1;
648 		}
649 		break;
650 	case EAP_TYPE_EXPANDED:
651 #ifdef EAP_TNC
652 		if (data->soh) {
653 			const u8 *epos;
654 			size_t eleft;
655 
656 			epos = eap_hdr_validate(EAP_VENDOR_MICROSOFT, 0x21,
657 						req, &eleft);
658 			if (epos) {
659 				struct wpabuf *buf;
660 				wpa_printf(MSG_DEBUG,
661 					   "EAP-PEAP: SoH EAP Extensions");
662 				buf = tncc_process_soh_request(data->soh,
663 							       epos, eleft);
664 				if (buf) {
665 					*resp = eap_msg_alloc(
666 						EAP_VENDOR_MICROSOFT, 0x21,
667 						wpabuf_len(buf),
668 						EAP_CODE_RESPONSE,
669 						hdr->identifier);
670 					if (*resp == NULL) {
671 						ret->methodState = METHOD_DONE;
672 						ret->decision = DECISION_FAIL;
673 						return -1;
674 					}
675 					wpabuf_put_buf(*resp, buf);
676 					wpabuf_free(buf);
677 					break;
678 				}
679 			}
680 		}
681 #endif /* EAP_TNC */
682 		/* fall through */
683 	default:
684 		if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
685 		    data->phase2_type.method == EAP_TYPE_NONE) {
686 			size_t i;
687 			for (i = 0; i < data->num_phase2_types; i++) {
688 				if (data->phase2_types[i].vendor !=
689 				    EAP_VENDOR_IETF ||
690 				    data->phase2_types[i].method != *pos)
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 (*pos != data->phase2_type.method ||
705 		    *pos == EAP_TYPE_NONE) {
706 			if (eap_peer_tls_phase2_nak(data->phase2_types,
707 						    data->num_phase2_types,
708 						    hdr, resp))
709 				return -1;
710 			return 0;
711 		}
712 
713 		if (data->phase2_priv == NULL) {
714 			data->phase2_method = eap_peer_get_eap_method(
715 				data->phase2_type.vendor,
716 				data->phase2_type.method);
717 			if (data->phase2_method) {
718 				sm->init_phase2 = 1;
719 				data->phase2_priv =
720 					data->phase2_method->init(sm);
721 				sm->init_phase2 = 0;
722 			}
723 		}
724 		if (data->phase2_priv == NULL || data->phase2_method == NULL) {
725 			wpa_printf(MSG_INFO, "EAP-PEAP: failed to initialize "
726 				   "Phase 2 EAP method %d", *pos);
727 			ret->methodState = METHOD_DONE;
728 			ret->decision = DECISION_FAIL;
729 			return -1;
730 		}
731 		data->phase2_eap_started = 1;
732 		os_memset(&iret, 0, sizeof(iret));
733 		*resp = data->phase2_method->process(sm, data->phase2_priv,
734 						     &iret, req);
735 		if ((iret.methodState == METHOD_DONE ||
736 		     iret.methodState == METHOD_MAY_CONT) &&
737 		    (iret.decision == DECISION_UNCOND_SUCC ||
738 		     iret.decision == DECISION_COND_SUCC)) {
739 			data->phase2_eap_success = 1;
740 			data->phase2_success = 1;
741 		}
742 		break;
743 	}
744 
745 	if (*resp == NULL &&
746 	    (config->pending_req_identity || config->pending_req_password ||
747 	     config->pending_req_otp || config->pending_req_new_password)) {
748 		wpabuf_free(data->pending_phase2_req);
749 		data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
750 	}
751 
752 	return 0;
753 }
754 
755 
756 static int eap_peap_decrypt(struct eap_sm *sm, struct eap_peap_data *data,
757 			    struct eap_method_ret *ret,
758 			    const struct eap_hdr *req,
759 			    const struct wpabuf *in_data,
760 			    struct wpabuf **out_data)
761 {
762 	struct wpabuf *in_decrypted = NULL;
763 	int res, skip_change = 0;
764 	struct eap_hdr *hdr, *rhdr;
765 	struct wpabuf *resp = NULL;
766 	size_t len;
767 
768 	wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
769 		   " Phase 2", (unsigned long) wpabuf_len(in_data));
770 
771 	if (data->pending_phase2_req) {
772 		wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 request - "
773 			   "skip decryption and use old data");
774 		/* Clear TLS reassembly state. */
775 		eap_peer_tls_reset_input(&data->ssl);
776 		in_decrypted = data->pending_phase2_req;
777 		data->pending_phase2_req = NULL;
778 		skip_change = 1;
779 		goto continue_req;
780 	}
781 
782 	if (wpabuf_len(in_data) == 0 && sm->workaround &&
783 	    data->phase2_success) {
784 		/*
785 		 * Cisco ACS seems to be using TLS ACK to terminate
786 		 * EAP-PEAPv0/GTC. Try to reply with TLS ACK.
787 		 */
788 		wpa_printf(MSG_DEBUG, "EAP-PEAP: Received TLS ACK, but "
789 			   "expected data - acknowledge with TLS ACK since "
790 			   "Phase 2 has been completed");
791 		ret->decision = DECISION_COND_SUCC;
792 		ret->methodState = METHOD_DONE;
793 		return 1;
794 	} else if (wpabuf_len(in_data) == 0) {
795 		/* Received TLS ACK - requesting more fragments */
796 		return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
797 					    data->peap_version,
798 					    req->identifier, NULL, out_data);
799 	}
800 
801 	res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
802 	if (res)
803 		return res;
804 
805 continue_req:
806 	wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP",
807 			in_decrypted);
808 
809 	hdr = wpabuf_mhead(in_decrypted);
810 	if (wpabuf_len(in_decrypted) == 5 && hdr->code == EAP_CODE_REQUEST &&
811 	    be_to_host16(hdr->length) == 5 &&
812 	    eap_get_type(in_decrypted) == EAP_TYPE_IDENTITY) {
813 		/* At least FreeRADIUS seems to send full EAP header with
814 		 * EAP Request Identity */
815 		skip_change = 1;
816 	}
817 	if (wpabuf_len(in_decrypted) >= 5 && hdr->code == EAP_CODE_REQUEST &&
818 	    eap_get_type(in_decrypted) == EAP_TYPE_TLV) {
819 		skip_change = 1;
820 	}
821 
822 	if (data->peap_version == 0 && !skip_change) {
823 		struct eap_hdr *nhdr;
824 		struct wpabuf *nmsg = wpabuf_alloc(sizeof(struct eap_hdr) +
825 						   wpabuf_len(in_decrypted));
826 		if (nmsg == NULL) {
827 			wpabuf_free(in_decrypted);
828 			return 0;
829 		}
830 		nhdr = wpabuf_put(nmsg, sizeof(*nhdr));
831 		wpabuf_put_buf(nmsg, in_decrypted);
832 		nhdr->code = req->code;
833 		nhdr->identifier = req->identifier;
834 		nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
835 					    wpabuf_len(in_decrypted));
836 
837 		wpabuf_free(in_decrypted);
838 		in_decrypted = nmsg;
839 	}
840 
841 	if (data->peap_version >= 2) {
842 		struct eap_tlv_hdr *tlv;
843 		struct wpabuf *nmsg;
844 
845 		if (wpabuf_len(in_decrypted) < sizeof(*tlv) + sizeof(*hdr)) {
846 			wpa_printf(MSG_INFO, "EAP-PEAPv2: Too short Phase 2 "
847 				   "EAP TLV");
848 			wpabuf_free(in_decrypted);
849 			return 0;
850 		}
851 		tlv = wpabuf_mhead(in_decrypted);
852 		if ((be_to_host16(tlv->tlv_type) & 0x3fff) !=
853 		    EAP_TLV_EAP_PAYLOAD_TLV) {
854 			wpa_printf(MSG_INFO, "EAP-PEAPv2: Not an EAP TLV");
855 			wpabuf_free(in_decrypted);
856 			return 0;
857 		}
858 		if (sizeof(*tlv) + be_to_host16(tlv->length) >
859 		    wpabuf_len(in_decrypted)) {
860 			wpa_printf(MSG_INFO, "EAP-PEAPv2: Invalid EAP TLV "
861 				   "length");
862 			wpabuf_free(in_decrypted);
863 			return 0;
864 		}
865 		hdr = (struct eap_hdr *) (tlv + 1);
866 		if (be_to_host16(hdr->length) > be_to_host16(tlv->length)) {
867 			wpa_printf(MSG_INFO, "EAP-PEAPv2: No room for full "
868 				   "EAP packet in EAP TLV");
869 			wpabuf_free(in_decrypted);
870 			return 0;
871 		}
872 
873 		nmsg = wpabuf_alloc(be_to_host16(hdr->length));
874 		if (nmsg == NULL) {
875 			wpabuf_free(in_decrypted);
876 			return 0;
877 		}
878 
879 		wpabuf_put_data(nmsg, hdr, be_to_host16(hdr->length));
880 		wpabuf_free(in_decrypted);
881 		in_decrypted = nmsg;
882 	}
883 
884 	hdr = wpabuf_mhead(in_decrypted);
885 	if (wpabuf_len(in_decrypted) < sizeof(*hdr)) {
886 		wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
887 			   "EAP frame (len=%lu)",
888 			   (unsigned long) wpabuf_len(in_decrypted));
889 		wpabuf_free(in_decrypted);
890 		return 0;
891 	}
892 	len = be_to_host16(hdr->length);
893 	if (len > wpabuf_len(in_decrypted)) {
894 		wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in "
895 			   "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
896 			   (unsigned long) wpabuf_len(in_decrypted),
897 			   (unsigned long) len);
898 		wpabuf_free(in_decrypted);
899 		return 0;
900 	}
901 	if (len < wpabuf_len(in_decrypted)) {
902 		wpa_printf(MSG_INFO, "EAP-PEAP: Odd.. Phase 2 EAP header has "
903 			   "shorter length than full decrypted data "
904 			   "(%lu < %lu)",
905 			   (unsigned long) len,
906 			   (unsigned long) wpabuf_len(in_decrypted));
907 	}
908 	wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d "
909 		   "identifier=%d length=%lu", hdr->code, hdr->identifier,
910 		   (unsigned long) len);
911 	switch (hdr->code) {
912 	case EAP_CODE_REQUEST:
913 		if (eap_peap_phase2_request(sm, data, ret, in_decrypted,
914 					    &resp)) {
915 			wpabuf_free(in_decrypted);
916 			wpa_printf(MSG_INFO, "EAP-PEAP: Phase2 Request "
917 				   "processing failed");
918 			return 0;
919 		}
920 		break;
921 	case EAP_CODE_SUCCESS:
922 		wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success");
923 		if (data->peap_version == 1) {
924 			/* EAP-Success within TLS tunnel is used to indicate
925 			 * shutdown of the TLS channel. The authentication has
926 			 * been completed. */
927 			if (data->phase2_eap_started &&
928 			    !data->phase2_eap_success) {
929 				wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 "
930 					   "Success used to indicate success, "
931 					   "but Phase 2 EAP was not yet "
932 					   "completed successfully");
933 				ret->methodState = METHOD_DONE;
934 				ret->decision = DECISION_FAIL;
935 				wpabuf_free(in_decrypted);
936 				return 0;
937 			}
938 			wpa_printf(MSG_DEBUG, "EAP-PEAP: Version 1 - "
939 				   "EAP-Success within TLS tunnel - "
940 				   "authentication completed");
941 			ret->decision = DECISION_UNCOND_SUCC;
942 			ret->methodState = METHOD_DONE;
943 			data->phase2_success = 1;
944 			if (data->peap_outer_success == 2) {
945 				wpabuf_free(in_decrypted);
946 				wpa_printf(MSG_DEBUG, "EAP-PEAP: Use TLS ACK "
947 					   "to finish authentication");
948 				return 1;
949 			} else if (data->peap_outer_success == 1) {
950 				/* Reply with EAP-Success within the TLS
951 				 * channel to complete the authentication. */
952 				resp = wpabuf_alloc(sizeof(struct eap_hdr));
953 				if (resp) {
954 					rhdr = wpabuf_put(resp, sizeof(*rhdr));
955 					rhdr->code = EAP_CODE_SUCCESS;
956 					rhdr->identifier = hdr->identifier;
957 					rhdr->length =
958 						host_to_be16(sizeof(*rhdr));
959 				}
960 			} else {
961 				/* No EAP-Success expected for Phase 1 (outer,
962 				 * unencrypted auth), so force EAP state
963 				 * machine to SUCCESS state. */
964 				sm->peap_done = TRUE;
965 			}
966 		} else {
967 			/* FIX: ? */
968 		}
969 		break;
970 	case EAP_CODE_FAILURE:
971 		wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure");
972 		ret->decision = DECISION_FAIL;
973 		ret->methodState = METHOD_MAY_CONT;
974 		ret->allowNotifications = FALSE;
975 		/* Reply with EAP-Failure within the TLS channel to complete
976 		 * failure reporting. */
977 		resp = wpabuf_alloc(sizeof(struct eap_hdr));
978 		if (resp) {
979 			rhdr = wpabuf_put(resp, sizeof(*rhdr));
980 			rhdr->code = EAP_CODE_FAILURE;
981 			rhdr->identifier = hdr->identifier;
982 			rhdr->length = host_to_be16(sizeof(*rhdr));
983 		}
984 		break;
985 	default:
986 		wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
987 			   "Phase 2 EAP header", hdr->code);
988 		break;
989 	}
990 
991 	wpabuf_free(in_decrypted);
992 
993 	if (resp) {
994 		int skip_change2 = 0;
995 		struct wpabuf *rmsg, buf;
996 
997 		wpa_hexdump_buf_key(MSG_DEBUG,
998 				    "EAP-PEAP: Encrypting Phase 2 data", resp);
999 		/* PEAP version changes */
1000 		if (data->peap_version >= 2) {
1001 			resp = eap_peapv2_tlv_eap_payload(resp);
1002 			if (resp == NULL)
1003 				return -1;
1004 		}
1005 		if (wpabuf_len(resp) >= 5 &&
1006 		    wpabuf_head_u8(resp)[0] == EAP_CODE_RESPONSE &&
1007 		    eap_get_type(resp) == EAP_TYPE_TLV)
1008 			skip_change2 = 1;
1009 		rmsg = resp;
1010 		if (data->peap_version == 0 && !skip_change2) {
1011 			wpabuf_set(&buf, wpabuf_head_u8(resp) +
1012 				   sizeof(struct eap_hdr),
1013 				   wpabuf_len(resp) - sizeof(struct eap_hdr));
1014 			rmsg = &buf;
1015 		}
1016 
1017 		if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
1018 					 data->peap_version, req->identifier,
1019 					 rmsg, out_data)) {
1020 			wpa_printf(MSG_INFO, "EAP-PEAP: Failed to encrypt "
1021 				   "a Phase 2 frame");
1022 		}
1023 		wpabuf_free(resp);
1024 	}
1025 
1026 	return 0;
1027 }
1028 
1029 
1030 static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv,
1031 					struct eap_method_ret *ret,
1032 					const struct wpabuf *reqData)
1033 {
1034 	const struct eap_hdr *req;
1035 	size_t left;
1036 	int res;
1037 	u8 flags, id;
1038 	struct wpabuf *resp;
1039 	const u8 *pos;
1040 	struct eap_peap_data *data = priv;
1041 
1042 	pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_PEAP, ret,
1043 					reqData, &left, &flags);
1044 	if (pos == NULL)
1045 		return NULL;
1046 	req = wpabuf_head(reqData);
1047 	id = req->identifier;
1048 
1049 	if (flags & EAP_TLS_FLAGS_START) {
1050 		wpa_printf(MSG_DEBUG, "EAP-PEAP: Start (server ver=%d, own "
1051 			   "ver=%d)", flags & EAP_TLS_VERSION_MASK,
1052 			data->peap_version);
1053 		if ((flags & EAP_TLS_VERSION_MASK) < data->peap_version)
1054 			data->peap_version = flags & EAP_TLS_VERSION_MASK;
1055 		if (data->force_peap_version >= 0 &&
1056 		    data->force_peap_version != data->peap_version) {
1057 			wpa_printf(MSG_WARNING, "EAP-PEAP: Failed to select "
1058 				   "forced PEAP version %d",
1059 				   data->force_peap_version);
1060 			ret->methodState = METHOD_DONE;
1061 			ret->decision = DECISION_FAIL;
1062 			ret->allowNotifications = FALSE;
1063 			return NULL;
1064 		}
1065 		wpa_printf(MSG_DEBUG, "EAP-PEAP: Using PEAP version %d",
1066 			   data->peap_version);
1067 		left = 0; /* make sure that this frame is empty, even though it
1068 			   * should always be, anyway */
1069 	}
1070 
1071 	resp = NULL;
1072 	if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1073 	    !data->resuming) {
1074 		struct wpabuf msg;
1075 		wpabuf_set(&msg, pos, left);
1076 		res = eap_peap_decrypt(sm, data, ret, req, &msg, &resp);
1077 	} else {
1078 		res = eap_peer_tls_process_helper(sm, &data->ssl,
1079 						  EAP_TYPE_PEAP,
1080 						  data->peap_version, id, pos,
1081 						  left, &resp);
1082 
1083 		if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1084 			char *label;
1085 			wpa_printf(MSG_DEBUG,
1086 				   "EAP-PEAP: TLS done, proceed to Phase 2");
1087 			os_free(data->key_data);
1088 			/* draft-josefsson-ppext-eap-tls-eap-05.txt
1089 			 * specifies that PEAPv1 would use "client PEAP
1090 			 * encryption" as the label. However, most existing
1091 			 * PEAPv1 implementations seem to be using the old
1092 			 * label, "client EAP encryption", instead. Use the old
1093 			 * label by default, but allow it to be configured with
1094 			 * phase1 parameter peaplabel=1. */
1095 			if (data->peap_version > 1 || data->force_new_label)
1096 				label = "client PEAP encryption";
1097 			else
1098 				label = "client EAP encryption";
1099 			wpa_printf(MSG_DEBUG, "EAP-PEAP: using label '%s' in "
1100 				   "key derivation", label);
1101 			data->key_data =
1102 				eap_peer_tls_derive_key(sm, &data->ssl, label,
1103 							EAP_TLS_KEY_LEN);
1104 			if (data->key_data) {
1105 				wpa_hexdump_key(MSG_DEBUG,
1106 						"EAP-PEAP: Derived key",
1107 						data->key_data,
1108 						EAP_TLS_KEY_LEN);
1109 			} else {
1110 				wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to "
1111 					   "derive key");
1112 			}
1113 
1114 			if (sm->workaround && data->resuming) {
1115 				/*
1116 				 * At least few RADIUS servers (Aegis v1.1.6;
1117 				 * but not v1.1.4; and Cisco ACS) seem to be
1118 				 * terminating PEAPv1 (Aegis) or PEAPv0 (Cisco
1119 				 * ACS) session resumption with outer
1120 				 * EAP-Success. This does not seem to follow
1121 				 * draft-josefsson-pppext-eap-tls-eap-05.txt
1122 				 * section 4.2, so only allow this if EAP
1123 				 * workarounds are enabled.
1124 				 */
1125 				wpa_printf(MSG_DEBUG, "EAP-PEAP: Workaround - "
1126 					   "allow outer EAP-Success to "
1127 					   "terminate PEAP resumption");
1128 				ret->decision = DECISION_COND_SUCC;
1129 				data->phase2_success = 1;
1130 			}
1131 
1132 			data->resuming = 0;
1133 		}
1134 
1135 		if (res == 2) {
1136 			struct wpabuf msg;
1137 			/*
1138 			 * Application data included in the handshake message.
1139 			 */
1140 			wpabuf_free(data->pending_phase2_req);
1141 			data->pending_phase2_req = resp;
1142 			resp = NULL;
1143 			wpabuf_set(&msg, pos, left);
1144 			res = eap_peap_decrypt(sm, data, ret, req, &msg,
1145 					       &resp);
1146 		}
1147 	}
1148 
1149 	if (ret->methodState == METHOD_DONE) {
1150 		ret->allowNotifications = FALSE;
1151 	}
1152 
1153 	if (res == 1) {
1154 		wpabuf_free(resp);
1155 		return eap_peer_tls_build_ack(id, EAP_TYPE_PEAP,
1156 					      data->peap_version);
1157 	}
1158 
1159 	return resp;
1160 }
1161 
1162 
1163 static Boolean eap_peap_has_reauth_data(struct eap_sm *sm, void *priv)
1164 {
1165 	struct eap_peap_data *data = priv;
1166 	return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1167 		data->phase2_success;
1168 }
1169 
1170 
1171 static void eap_peap_deinit_for_reauth(struct eap_sm *sm, void *priv)
1172 {
1173 	struct eap_peap_data *data = priv;
1174 	wpabuf_free(data->pending_phase2_req);
1175 	data->pending_phase2_req = NULL;
1176 	data->crypto_binding_used = 0;
1177 }
1178 
1179 
1180 static void * eap_peap_init_for_reauth(struct eap_sm *sm, void *priv)
1181 {
1182 	struct eap_peap_data *data = priv;
1183 	os_free(data->key_data);
1184 	data->key_data = NULL;
1185 	if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1186 		os_free(data);
1187 		return NULL;
1188 	}
1189 	if (data->phase2_priv && data->phase2_method &&
1190 	    data->phase2_method->init_for_reauth)
1191 		data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1192 	data->phase2_success = 0;
1193 	data->phase2_eap_success = 0;
1194 	data->phase2_eap_started = 0;
1195 	data->resuming = 1;
1196 	data->reauth = 1;
1197 	sm->peap_done = FALSE;
1198 	return priv;
1199 }
1200 
1201 
1202 static int eap_peap_get_status(struct eap_sm *sm, void *priv, char *buf,
1203 			       size_t buflen, int verbose)
1204 {
1205 	struct eap_peap_data *data = priv;
1206 	int len, ret;
1207 
1208 	len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1209 	if (data->phase2_method) {
1210 		ret = os_snprintf(buf + len, buflen - len,
1211 				  "EAP-PEAPv%d Phase2 method=%s\n",
1212 				  data->peap_version,
1213 				  data->phase2_method->name);
1214 		if (ret < 0 || (size_t) ret >= buflen - len)
1215 			return len;
1216 		len += ret;
1217 	}
1218 	return len;
1219 }
1220 
1221 
1222 static Boolean eap_peap_isKeyAvailable(struct eap_sm *sm, void *priv)
1223 {
1224 	struct eap_peap_data *data = priv;
1225 	return data->key_data != NULL && data->phase2_success;
1226 }
1227 
1228 
1229 static u8 * eap_peap_getKey(struct eap_sm *sm, void *priv, size_t *len)
1230 {
1231 	struct eap_peap_data *data = priv;
1232 	u8 *key;
1233 
1234 	if (data->key_data == NULL || !data->phase2_success)
1235 		return NULL;
1236 
1237 	key = os_malloc(EAP_TLS_KEY_LEN);
1238 	if (key == NULL)
1239 		return NULL;
1240 
1241 	*len = EAP_TLS_KEY_LEN;
1242 
1243 	if (data->crypto_binding_used) {
1244 		u8 csk[128];
1245 		/*
1246 		 * Note: It looks like Microsoft implementation requires null
1247 		 * termination for this label while the one used for deriving
1248 		 * IPMK|CMK did not use null termination.
1249 		 */
1250 		peap_prfplus(data->peap_version, data->ipmk, 40,
1251 			     "Session Key Generating Function",
1252 			     (u8 *) "\00", 1, csk, sizeof(csk));
1253 		wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk));
1254 		os_memcpy(key, csk, EAP_TLS_KEY_LEN);
1255 		wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
1256 			    key, EAP_TLS_KEY_LEN);
1257 	} else
1258 		os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
1259 
1260 	return key;
1261 }
1262 
1263 
1264 int eap_peer_peap_register(void)
1265 {
1266 	struct eap_method *eap;
1267 	int ret;
1268 
1269 	eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1270 				    EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP");
1271 	if (eap == NULL)
1272 		return -1;
1273 
1274 	eap->init = eap_peap_init;
1275 	eap->deinit = eap_peap_deinit;
1276 	eap->process = eap_peap_process;
1277 	eap->isKeyAvailable = eap_peap_isKeyAvailable;
1278 	eap->getKey = eap_peap_getKey;
1279 	eap->get_status = eap_peap_get_status;
1280 	eap->has_reauth_data = eap_peap_has_reauth_data;
1281 	eap->deinit_for_reauth = eap_peap_deinit_for_reauth;
1282 	eap->init_for_reauth = eap_peap_init_for_reauth;
1283 
1284 	ret = eap_peer_method_register(eap);
1285 	if (ret)
1286 		eap_peer_method_free(eap);
1287 	return ret;
1288 }
1289