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
30static void eap_peap_deinit(struct eap_sm *sm, void *priv);
31
32
33struct 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
71static 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
132static 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
172static 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 */
196static 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
215static 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
244static 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
298static 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 */
348static 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
381static 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 */
456static 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
580static 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
607static 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
752static 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
801continue_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
1026static 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
1159static 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
1167static 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
1176static 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
1198static 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
1218static 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
1225static 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
1263int 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