Disconnect hostapd from building in base
[dragonfly.git] / contrib / hostapd / src / eap_peer / eap_peap.c
1 /*
2  * EAP peer method: EAP-PEAP (draft-josefsson-pppext-eap-tls-eap-10.txt)
3  * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
4  *
5  * This software may be distributed under the terms of the BSD license.
6  * See README for more details.
7  */
8
9 #include "includes.h"
10
11 #include "common.h"
12 #include "crypto/sha1.h"
13 #include "crypto/tls.h"
14 #include "eap_common/eap_tlv_common.h"
15 #include "eap_common/eap_peap_common.h"
16 #include "eap_i.h"
17 #include "eap_tls_common.h"
18 #include "eap_config.h"
19 #include "tncc.h"
20
21
22 /* Maximum supported PEAP version
23  * 0 = Microsoft's PEAP version 0; draft-kamath-pppext-peapv0-00.txt
24  * 1 = draft-josefsson-ppext-eap-tls-eap-05.txt
25  */
26 #define EAP_PEAP_VERSION 1
27
28
29 static void eap_peap_deinit(struct eap_sm *sm, void *priv);
30
31
32 struct eap_peap_data {
33         struct eap_ssl_data ssl;
34
35         int peap_version, force_peap_version, force_new_label;
36
37         const struct eap_method *phase2_method;
38         void *phase2_priv;
39         int phase2_success;
40         int phase2_eap_success;
41         int phase2_eap_started;
42
43         struct eap_method_type phase2_type;
44         struct eap_method_type *phase2_types;
45         size_t num_phase2_types;
46
47         int peap_outer_success; /* 0 = PEAP terminated on Phase 2 inner
48                                  * EAP-Success
49                                  * 1 = reply with tunneled EAP-Success to inner
50                                  * EAP-Success and expect AS to send outer
51                                  * (unencrypted) EAP-Success after this
52                                  * 2 = reply with PEAP/TLS ACK to inner
53                                  * EAP-Success and expect AS to send outer
54                                  * (unencrypted) EAP-Success after this */
55         int resuming; /* starting a resumed session */
56         int reauth; /* reauthentication */
57         u8 *key_data;
58         u8 *session_id;
59         size_t id_len;
60
61         struct wpabuf *pending_phase2_req;
62         enum { NO_BINDING, OPTIONAL_BINDING, REQUIRE_BINDING } crypto_binding;
63         int crypto_binding_used;
64         u8 binding_nonce[32];
65         u8 ipmk[40];
66         u8 cmk[20];
67         int soh; /* Whether IF-TNCCS-SOH (Statement of Health; Microsoft NAP)
68                   * is enabled. */
69 };
70
71
72 static int eap_peap_parse_phase1(struct eap_peap_data *data,
73                                  const char *phase1)
74 {
75         const char *pos;
76
77         pos = os_strstr(phase1, "peapver=");
78         if (pos) {
79                 data->force_peap_version = atoi(pos + 8);
80                 data->peap_version = data->force_peap_version;
81                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Forced PEAP version %d",
82                            data->force_peap_version);
83         }
84
85         if (os_strstr(phase1, "peaplabel=1")) {
86                 data->force_new_label = 1;
87                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Force new label for key "
88                            "derivation");
89         }
90
91         if (os_strstr(phase1, "peap_outer_success=0")) {
92                 data->peap_outer_success = 0;
93                 wpa_printf(MSG_DEBUG, "EAP-PEAP: terminate authentication on "
94                            "tunneled EAP-Success");
95         } else if (os_strstr(phase1, "peap_outer_success=1")) {
96                 data->peap_outer_success = 1;
97                 wpa_printf(MSG_DEBUG, "EAP-PEAP: send tunneled EAP-Success "
98                            "after receiving tunneled EAP-Success");
99         } else if (os_strstr(phase1, "peap_outer_success=2")) {
100                 data->peap_outer_success = 2;
101                 wpa_printf(MSG_DEBUG, "EAP-PEAP: send PEAP/TLS ACK after "
102                            "receiving tunneled EAP-Success");
103         }
104
105         if (os_strstr(phase1, "crypto_binding=0")) {
106                 data->crypto_binding = NO_BINDING;
107                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Do not use cryptobinding");
108         } else if (os_strstr(phase1, "crypto_binding=1")) {
109                 data->crypto_binding = OPTIONAL_BINDING;
110                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Optional cryptobinding");
111         } else if (os_strstr(phase1, "crypto_binding=2")) {
112                 data->crypto_binding = REQUIRE_BINDING;
113                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Require cryptobinding");
114         }
115
116 #ifdef EAP_TNC
117         if (os_strstr(phase1, "tnc=soh2")) {
118                 data->soh = 2;
119                 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled");
120         } else if (os_strstr(phase1, "tnc=soh1")) {
121                 data->soh = 1;
122                 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 1 enabled");
123         } else if (os_strstr(phase1, "tnc=soh")) {
124                 data->soh = 2;
125                 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled");
126         }
127 #endif /* EAP_TNC */
128
129         return 0;
130 }
131
132
133 static void * eap_peap_init(struct eap_sm *sm)
134 {
135         struct eap_peap_data *data;
136         struct eap_peer_config *config = eap_get_config(sm);
137
138         data = os_zalloc(sizeof(*data));
139         if (data == NULL)
140                 return NULL;
141         sm->peap_done = FALSE;
142         data->peap_version = EAP_PEAP_VERSION;
143         data->force_peap_version = -1;
144         data->peap_outer_success = 2;
145         data->crypto_binding = OPTIONAL_BINDING;
146
147         if (config && config->phase1 &&
148             eap_peap_parse_phase1(data, config->phase1) < 0) {
149                 eap_peap_deinit(sm, data);
150                 return NULL;
151         }
152
153         if (eap_peer_select_phase2_methods(config, "auth=",
154                                            &data->phase2_types,
155                                            &data->num_phase2_types) < 0) {
156                 eap_peap_deinit(sm, data);
157                 return NULL;
158         }
159
160         data->phase2_type.vendor = EAP_VENDOR_IETF;
161         data->phase2_type.method = EAP_TYPE_NONE;
162
163         if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_PEAP)) {
164                 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to initialize SSL.");
165                 eap_peap_deinit(sm, data);
166                 return NULL;
167         }
168
169         return data;
170 }
171
172
173 static void eap_peap_deinit(struct eap_sm *sm, void *priv)
174 {
175         struct eap_peap_data *data = priv;
176         if (data == NULL)
177                 return;
178         if (data->phase2_priv && data->phase2_method)
179                 data->phase2_method->deinit(sm, data->phase2_priv);
180         os_free(data->phase2_types);
181         eap_peer_tls_ssl_deinit(sm, &data->ssl);
182         os_free(data->key_data);
183         os_free(data->session_id);
184         wpabuf_free(data->pending_phase2_req);
185         os_free(data);
186 }
187
188
189 /**
190  * eap_tlv_build_nak - Build EAP-TLV NAK message
191  * @id: EAP identifier for the header
192  * @nak_type: TLV type (EAP_TLV_*)
193  * Returns: Buffer to the allocated EAP-TLV NAK message or %NULL on failure
194  *
195  * This function builds an EAP-TLV NAK message. The caller is responsible for
196  * freeing the returned buffer.
197  */
198 static struct wpabuf * eap_tlv_build_nak(int id, u16 nak_type)
199 {
200         struct wpabuf *msg;
201
202         msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, 10,
203                             EAP_CODE_RESPONSE, id);
204         if (msg == NULL)
205                 return NULL;
206
207         wpabuf_put_u8(msg, 0x80); /* Mandatory */
208         wpabuf_put_u8(msg, EAP_TLV_NAK_TLV);
209         wpabuf_put_be16(msg, 6); /* Length */
210         wpabuf_put_be32(msg, 0); /* Vendor-Id */
211         wpabuf_put_be16(msg, nak_type); /* NAK-Type */
212
213         return msg;
214 }
215
216
217 static int eap_peap_get_isk(struct eap_sm *sm, struct eap_peap_data *data,
218                             u8 *isk, size_t isk_len)
219 {
220         u8 *key;
221         size_t key_len;
222
223         os_memset(isk, 0, isk_len);
224         if (data->phase2_method == NULL || data->phase2_priv == NULL ||
225             data->phase2_method->isKeyAvailable == NULL ||
226             data->phase2_method->getKey == NULL)
227                 return 0;
228
229         if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
230             (key = data->phase2_method->getKey(sm, data->phase2_priv,
231                                                &key_len)) == NULL) {
232                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not get key material "
233                            "from Phase 2");
234                 return -1;
235         }
236
237         if (key_len > isk_len)
238                 key_len = isk_len;
239         os_memcpy(isk, key, key_len);
240         os_free(key);
241
242         return 0;
243 }
244
245
246 static int eap_peap_derive_cmk(struct eap_sm *sm, struct eap_peap_data *data)
247 {
248         u8 *tk;
249         u8 isk[32], imck[60];
250
251         /*
252          * Tunnel key (TK) is the first 60 octets of the key generated by
253          * phase 1 of PEAP (based on TLS).
254          */
255         tk = data->key_data;
256         if (tk == NULL)
257                 return -1;
258         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TK", tk, 60);
259
260         if (data->reauth &&
261             tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) {
262                 /* Fast-connect: IPMK|CMK = TK */
263                 os_memcpy(data->ipmk, tk, 40);
264                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK from TK",
265                                 data->ipmk, 40);
266                 os_memcpy(data->cmk, tk + 40, 20);
267                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK from TK",
268                                 data->cmk, 20);
269                 return 0;
270         }
271
272         if (eap_peap_get_isk(sm, data, isk, sizeof(isk)) < 0)
273                 return -1;
274         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: ISK", isk, sizeof(isk));
275
276         /*
277          * IPMK Seed = "Inner Methods Compound Keys" | ISK
278          * TempKey = First 40 octets of TK
279          * IPMK|CMK = PRF+(TempKey, IPMK Seed, 60)
280          * (note: draft-josefsson-pppext-eap-tls-eap-10.txt includes a space
281          * in the end of the label just before ISK; is that just a typo?)
282          */
283         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TempKey", tk, 40);
284         if (peap_prfplus(data->peap_version, tk, 40,
285                          "Inner Methods Compound Keys",
286                          isk, sizeof(isk), imck, sizeof(imck)) < 0)
287                 return -1;
288         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IMCK (IPMKj)",
289                         imck, sizeof(imck));
290
291         os_memcpy(data->ipmk, imck, 40);
292         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK (S-IPMKj)", data->ipmk, 40);
293         os_memcpy(data->cmk, imck + 40, 20);
294         wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK (CMKj)", data->cmk, 20);
295
296         return 0;
297 }
298
299
300 static int eap_tlv_add_cryptobinding(struct eap_sm *sm,
301                                      struct eap_peap_data *data,
302                                      struct wpabuf *buf)
303 {
304         u8 *mac;
305         u8 eap_type = EAP_TYPE_PEAP;
306         const u8 *addr[2];
307         size_t len[2];
308         u16 tlv_type;
309
310         /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
311         addr[0] = wpabuf_put(buf, 0);
312         len[0] = 60;
313         addr[1] = &eap_type;
314         len[1] = 1;
315
316         tlv_type = EAP_TLV_CRYPTO_BINDING_TLV;
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  */
348 static struct wpabuf * eap_tlv_build_result(struct eap_sm *sm,
349                                             struct eap_peap_data *data,
350                                             int crypto_tlv_used,
351                                             int id, u16 status)
352 {
353         struct wpabuf *msg;
354         size_t len;
355
356         if (data->crypto_binding == NO_BINDING)
357                 crypto_tlv_used = 0;
358
359         len = 6;
360         if (crypto_tlv_used)
361                 len += 60; /* Cryptobinding TLV */
362         msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, len,
363                             EAP_CODE_RESPONSE, id);
364         if (msg == NULL)
365                 return NULL;
366
367         wpabuf_put_u8(msg, 0x80); /* Mandatory */
368         wpabuf_put_u8(msg, EAP_TLV_RESULT_TLV);
369         wpabuf_put_be16(msg, 2); /* Length */
370         wpabuf_put_be16(msg, status); /* Status */
371
372         if (crypto_tlv_used && eap_tlv_add_cryptobinding(sm, data, msg)) {
373                 wpabuf_free(msg);
374                 return NULL;
375         }
376
377         return msg;
378 }
379
380
381 static int eap_tlv_validate_cryptobinding(struct eap_sm *sm,
382                                           struct eap_peap_data *data,
383                                           const u8 *crypto_tlv,
384                                           size_t crypto_tlv_len)
385 {
386         u8 buf[61], mac[SHA1_MAC_LEN];
387         const u8 *pos;
388
389         if (eap_peap_derive_cmk(sm, data) < 0) {
390                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not derive CMK");
391                 return -1;
392         }
393
394         if (crypto_tlv_len != 4 + 56) {
395                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid cryptobinding TLV "
396                            "length %d", (int) crypto_tlv_len);
397                 return -1;
398         }
399
400         pos = crypto_tlv;
401         pos += 4; /* TLV header */
402         if (pos[1] != data->peap_version) {
403                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV Version "
404                            "mismatch (was %d; expected %d)",
405                            pos[1], data->peap_version);
406                 return -1;
407         }
408
409         if (pos[3] != 0) {
410                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV "
411                            "SubType %d", pos[3]);
412                 return -1;
413         }
414         pos += 4;
415         os_memcpy(data->binding_nonce, pos, 32);
416         pos += 32; /* Nonce */
417
418         /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */
419         os_memcpy(buf, crypto_tlv, 60);
420         os_memset(buf + 4 + 4 + 32, 0, 20); /* Compound_MAC */
421         buf[60] = EAP_TYPE_PEAP;
422         wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Compound_MAC data",
423                     buf, sizeof(buf));
424         hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac);
425
426         if (os_memcmp(mac, pos, SHA1_MAC_LEN) != 0) {
427                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in "
428                            "cryptobinding TLV");
429                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received MAC",
430                             pos, SHA1_MAC_LEN);
431                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Expected MAC",
432                             mac, SHA1_MAC_LEN);
433                 return -1;
434         }
435
436         wpa_printf(MSG_DEBUG, "EAP-PEAP: Valid cryptobinding TLV received");
437
438         return 0;
439 }
440
441
442 /**
443  * eap_tlv_process - Process a received EAP-TLV message and generate a response
444  * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
445  * @ret: Return values from EAP request validation and processing
446  * @req: EAP-TLV request to be processed. The caller must have validated that
447  * the buffer is large enough to contain full request (hdr->length bytes) and
448  * that the EAP type is EAP_TYPE_TLV.
449  * @resp: Buffer to return a pointer to the allocated response message. This
450  * field should be initialized to %NULL before the call. The value will be
451  * updated if a response message is generated. The caller is responsible for
452  * freeing the allocated message.
453  * @force_failure: Force negotiation to fail
454  * Returns: 0 on success, -1 on failure
455  */
456 static int eap_tlv_process(struct eap_sm *sm, struct eap_peap_data *data,
457                            struct eap_method_ret *ret,
458                            const struct wpabuf *req, struct wpabuf **resp,
459                            int force_failure)
460 {
461         size_t left, tlv_len;
462         const u8 *pos;
463         const u8 *result_tlv = NULL, *crypto_tlv = NULL;
464         size_t result_tlv_len = 0, crypto_tlv_len = 0;
465         int tlv_type, mandatory;
466
467         /* Parse TLVs */
468         pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, req, &left);
469         if (pos == NULL)
470                 return -1;
471         wpa_hexdump(MSG_DEBUG, "EAP-TLV: Received TLVs", pos, left);
472         while (left >= 4) {
473                 mandatory = !!(pos[0] & 0x80);
474                 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
475                 pos += 2;
476                 tlv_len = WPA_GET_BE16(pos);
477                 pos += 2;
478                 left -= 4;
479                 if (tlv_len > left) {
480                         wpa_printf(MSG_DEBUG, "EAP-TLV: TLV underrun "
481                                    "(tlv_len=%lu left=%lu)",
482                                    (unsigned long) tlv_len,
483                                    (unsigned long) left);
484                         return -1;
485                 }
486                 switch (tlv_type) {
487                 case EAP_TLV_RESULT_TLV:
488                         result_tlv = pos;
489                         result_tlv_len = tlv_len;
490                         break;
491                 case EAP_TLV_CRYPTO_BINDING_TLV:
492                         crypto_tlv = pos;
493                         crypto_tlv_len = tlv_len;
494                         break;
495                 default:
496                         wpa_printf(MSG_DEBUG, "EAP-TLV: Unsupported TLV Type "
497                                    "%d%s", tlv_type,
498                                    mandatory ? " (mandatory)" : "");
499                         if (mandatory) {
500                                 /* NAK TLV and ignore all TLVs in this packet.
501                                  */
502                                 *resp = eap_tlv_build_nak(eap_get_id(req),
503                                                           tlv_type);
504                                 return *resp == NULL ? -1 : 0;
505                         }
506                         /* Ignore this TLV, but process other TLVs */
507                         break;
508                 }
509
510                 pos += tlv_len;
511                 left -= tlv_len;
512         }
513         if (left) {
514                 wpa_printf(MSG_DEBUG, "EAP-TLV: Last TLV too short in "
515                            "Request (left=%lu)", (unsigned long) left);
516                 return -1;
517         }
518
519         /* Process supported TLVs */
520         if (crypto_tlv && data->crypto_binding != NO_BINDING) {
521                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV",
522                             crypto_tlv, crypto_tlv_len);
523                 if (eap_tlv_validate_cryptobinding(sm, data, crypto_tlv - 4,
524                                                    crypto_tlv_len + 4) < 0) {
525                         if (result_tlv == NULL)
526                                 return -1;
527                         force_failure = 1;
528                         crypto_tlv = NULL; /* do not include Cryptobinding TLV
529                                             * in response, if the received
530                                             * cryptobinding was invalid. */
531                 }
532         } else if (!crypto_tlv && data->crypto_binding == REQUIRE_BINDING) {
533                 wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV");
534                 return -1;
535         }
536
537         if (result_tlv) {
538                 int status, resp_status;
539                 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Result TLV",
540                             result_tlv, result_tlv_len);
541                 if (result_tlv_len < 2) {
542                         wpa_printf(MSG_INFO, "EAP-TLV: Too short Result TLV "
543                                    "(len=%lu)",
544                                    (unsigned long) result_tlv_len);
545                         return -1;
546                 }
547                 status = WPA_GET_BE16(result_tlv);
548                 if (status == EAP_TLV_RESULT_SUCCESS) {
549                         wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Success "
550                                    "- EAP-TLV/Phase2 Completed");
551                         if (force_failure) {
552                                 wpa_printf(MSG_INFO, "EAP-TLV: Earlier failure"
553                                            " - force failed Phase 2");
554                                 resp_status = EAP_TLV_RESULT_FAILURE;
555                                 ret->decision = DECISION_FAIL;
556                         } else {
557                                 resp_status = EAP_TLV_RESULT_SUCCESS;
558                                 ret->decision = DECISION_UNCOND_SUCC;
559                         }
560                 } else if (status == EAP_TLV_RESULT_FAILURE) {
561                         wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Failure");
562                         resp_status = EAP_TLV_RESULT_FAILURE;
563                         ret->decision = DECISION_FAIL;
564                 } else {
565                         wpa_printf(MSG_INFO, "EAP-TLV: Unknown TLV Result "
566                                    "Status %d", status);
567                         resp_status = EAP_TLV_RESULT_FAILURE;
568                         ret->decision = DECISION_FAIL;
569                 }
570                 ret->methodState = METHOD_DONE;
571
572                 *resp = eap_tlv_build_result(sm, data, crypto_tlv != NULL,
573                                              eap_get_id(req), resp_status);
574         }
575
576         return 0;
577 }
578
579
580 static int eap_peap_phase2_request(struct eap_sm *sm,
581                                    struct eap_peap_data *data,
582                                    struct eap_method_ret *ret,
583                                    struct wpabuf *req,
584                                    struct wpabuf **resp)
585 {
586         struct eap_hdr *hdr = wpabuf_mhead(req);
587         size_t len = be_to_host16(hdr->length);
588         u8 *pos;
589         struct eap_method_ret iret;
590         struct eap_peer_config *config = eap_get_config(sm);
591
592         if (len <= sizeof(struct eap_hdr)) {
593                 wpa_printf(MSG_INFO, "EAP-PEAP: too short "
594                            "Phase 2 request (len=%lu)", (unsigned long) len);
595                 return -1;
596         }
597         pos = (u8 *) (hdr + 1);
598         wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Request: type=%d", *pos);
599         switch (*pos) {
600         case EAP_TYPE_IDENTITY:
601                 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
602                 break;
603         case EAP_TYPE_TLV:
604                 os_memset(&iret, 0, sizeof(iret));
605                 if (eap_tlv_process(sm, data, &iret, req, resp,
606                                     data->phase2_eap_started &&
607                                     !data->phase2_eap_success)) {
608                         ret->methodState = METHOD_DONE;
609                         ret->decision = DECISION_FAIL;
610                         return -1;
611                 }
612                 if (iret.methodState == METHOD_DONE ||
613                     iret.methodState == METHOD_MAY_CONT) {
614                         ret->methodState = iret.methodState;
615                         ret->decision = iret.decision;
616                         data->phase2_success = 1;
617                 }
618                 break;
619         case EAP_TYPE_EXPANDED:
620 #ifdef EAP_TNC
621                 if (data->soh) {
622                         const u8 *epos;
623                         size_t eleft;
624
625                         epos = eap_hdr_validate(EAP_VENDOR_MICROSOFT, 0x21,
626                                                 req, &eleft);
627                         if (epos) {
628                                 struct wpabuf *buf;
629                                 wpa_printf(MSG_DEBUG,
630                                            "EAP-PEAP: SoH EAP Extensions");
631                                 buf = tncc_process_soh_request(data->soh,
632                                                                epos, eleft);
633                                 if (buf) {
634                                         *resp = eap_msg_alloc(
635                                                 EAP_VENDOR_MICROSOFT, 0x21,
636                                                 wpabuf_len(buf),
637                                                 EAP_CODE_RESPONSE,
638                                                 hdr->identifier);
639                                         if (*resp == NULL) {
640                                                 ret->methodState = METHOD_DONE;
641                                                 ret->decision = DECISION_FAIL;
642                                                 return -1;
643                                         }
644                                         wpabuf_put_buf(*resp, buf);
645                                         wpabuf_free(buf);
646                                         break;
647                                 }
648                         }
649                 }
650 #endif /* EAP_TNC */
651                 /* fall through */
652         default:
653                 if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
654                     data->phase2_type.method == EAP_TYPE_NONE) {
655                         size_t i;
656                         for (i = 0; i < data->num_phase2_types; i++) {
657                                 if (data->phase2_types[i].vendor !=
658                                     EAP_VENDOR_IETF ||
659                                     data->phase2_types[i].method != *pos)
660                                         continue;
661
662                                 data->phase2_type.vendor =
663                                         data->phase2_types[i].vendor;
664                                 data->phase2_type.method =
665                                         data->phase2_types[i].method;
666                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Selected "
667                                            "Phase 2 EAP vendor %d method %d",
668                                            data->phase2_type.vendor,
669                                            data->phase2_type.method);
670                                 break;
671                         }
672                 }
673                 if (*pos != data->phase2_type.method ||
674                     *pos == EAP_TYPE_NONE) {
675                         if (eap_peer_tls_phase2_nak(data->phase2_types,
676                                                     data->num_phase2_types,
677                                                     hdr, resp))
678                                 return -1;
679                         return 0;
680                 }
681
682                 if (data->phase2_priv == NULL) {
683                         data->phase2_method = eap_peer_get_eap_method(
684                                 data->phase2_type.vendor,
685                                 data->phase2_type.method);
686                         if (data->phase2_method) {
687                                 sm->init_phase2 = 1;
688                                 data->phase2_priv =
689                                         data->phase2_method->init(sm);
690                                 sm->init_phase2 = 0;
691                         }
692                 }
693                 if (data->phase2_priv == NULL || data->phase2_method == NULL) {
694                         wpa_printf(MSG_INFO, "EAP-PEAP: failed to initialize "
695                                    "Phase 2 EAP method %d", *pos);
696                         ret->methodState = METHOD_DONE;
697                         ret->decision = DECISION_FAIL;
698                         return -1;
699                 }
700                 data->phase2_eap_started = 1;
701                 os_memset(&iret, 0, sizeof(iret));
702                 *resp = data->phase2_method->process(sm, data->phase2_priv,
703                                                      &iret, req);
704                 if ((iret.methodState == METHOD_DONE ||
705                      iret.methodState == METHOD_MAY_CONT) &&
706                     (iret.decision == DECISION_UNCOND_SUCC ||
707                      iret.decision == DECISION_COND_SUCC)) {
708                         data->phase2_eap_success = 1;
709                         data->phase2_success = 1;
710                 }
711                 break;
712         }
713
714         if (*resp == NULL &&
715             (config->pending_req_identity || config->pending_req_password ||
716              config->pending_req_otp || config->pending_req_new_password)) {
717                 wpabuf_free(data->pending_phase2_req);
718                 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
719         }
720
721         return 0;
722 }
723
724
725 static int eap_peap_decrypt(struct eap_sm *sm, struct eap_peap_data *data,
726                             struct eap_method_ret *ret,
727                             const struct eap_hdr *req,
728                             const struct wpabuf *in_data,
729                             struct wpabuf **out_data)
730 {
731         struct wpabuf *in_decrypted = NULL;
732         int res, skip_change = 0;
733         struct eap_hdr *hdr, *rhdr;
734         struct wpabuf *resp = NULL;
735         size_t len;
736
737         wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for"
738                    " Phase 2", (unsigned long) wpabuf_len(in_data));
739
740         if (data->pending_phase2_req) {
741                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 request - "
742                            "skip decryption and use old data");
743                 /* Clear TLS reassembly state. */
744                 eap_peer_tls_reset_input(&data->ssl);
745                 in_decrypted = data->pending_phase2_req;
746                 data->pending_phase2_req = NULL;
747                 skip_change = 1;
748                 goto continue_req;
749         }
750
751         if (wpabuf_len(in_data) == 0 && sm->workaround &&
752             data->phase2_success) {
753                 /*
754                  * Cisco ACS seems to be using TLS ACK to terminate
755                  * EAP-PEAPv0/GTC. Try to reply with TLS ACK.
756                  */
757                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Received TLS ACK, but "
758                            "expected data - acknowledge with TLS ACK since "
759                            "Phase 2 has been completed");
760                 ret->decision = DECISION_COND_SUCC;
761                 ret->methodState = METHOD_DONE;
762                 return 1;
763         } else if (wpabuf_len(in_data) == 0) {
764                 /* Received TLS ACK - requesting more fragments */
765                 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
766                                             data->peap_version,
767                                             req->identifier, NULL, out_data);
768         }
769
770         res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
771         if (res)
772                 return res;
773
774 continue_req:
775         wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP",
776                         in_decrypted);
777
778         hdr = wpabuf_mhead(in_decrypted);
779         if (wpabuf_len(in_decrypted) == 5 && hdr->code == EAP_CODE_REQUEST &&
780             be_to_host16(hdr->length) == 5 &&
781             eap_get_type(in_decrypted) == EAP_TYPE_IDENTITY) {
782                 /* At least FreeRADIUS seems to send full EAP header with
783                  * EAP Request Identity */
784                 skip_change = 1;
785         }
786         if (wpabuf_len(in_decrypted) >= 5 && hdr->code == EAP_CODE_REQUEST &&
787             eap_get_type(in_decrypted) == EAP_TYPE_TLV) {
788                 skip_change = 1;
789         }
790
791         if (data->peap_version == 0 && !skip_change) {
792                 struct eap_hdr *nhdr;
793                 struct wpabuf *nmsg = wpabuf_alloc(sizeof(struct eap_hdr) +
794                                                    wpabuf_len(in_decrypted));
795                 if (nmsg == NULL) {
796                         wpabuf_free(in_decrypted);
797                         return 0;
798                 }
799                 nhdr = wpabuf_put(nmsg, sizeof(*nhdr));
800                 wpabuf_put_buf(nmsg, in_decrypted);
801                 nhdr->code = req->code;
802                 nhdr->identifier = req->identifier;
803                 nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
804                                             wpabuf_len(in_decrypted));
805
806                 wpabuf_free(in_decrypted);
807                 in_decrypted = nmsg;
808         }
809
810         hdr = wpabuf_mhead(in_decrypted);
811         if (wpabuf_len(in_decrypted) < sizeof(*hdr)) {
812                 wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 "
813                            "EAP frame (len=%lu)",
814                            (unsigned long) wpabuf_len(in_decrypted));
815                 wpabuf_free(in_decrypted);
816                 return 0;
817         }
818         len = be_to_host16(hdr->length);
819         if (len > wpabuf_len(in_decrypted)) {
820                 wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in "
821                            "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
822                            (unsigned long) wpabuf_len(in_decrypted),
823                            (unsigned long) len);
824                 wpabuf_free(in_decrypted);
825                 return 0;
826         }
827         if (len < wpabuf_len(in_decrypted)) {
828                 wpa_printf(MSG_INFO, "EAP-PEAP: Odd.. Phase 2 EAP header has "
829                            "shorter length than full decrypted data "
830                            "(%lu < %lu)",
831                            (unsigned long) len,
832                            (unsigned long) wpabuf_len(in_decrypted));
833         }
834         wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d "
835                    "identifier=%d length=%lu", hdr->code, hdr->identifier,
836                    (unsigned long) len);
837         switch (hdr->code) {
838         case EAP_CODE_REQUEST:
839                 if (eap_peap_phase2_request(sm, data, ret, in_decrypted,
840                                             &resp)) {
841                         wpabuf_free(in_decrypted);
842                         wpa_printf(MSG_INFO, "EAP-PEAP: Phase2 Request "
843                                    "processing failed");
844                         return 0;
845                 }
846                 break;
847         case EAP_CODE_SUCCESS:
848                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success");
849                 if (data->peap_version == 1) {
850                         /* EAP-Success within TLS tunnel is used to indicate
851                          * shutdown of the TLS channel. The authentication has
852                          * been completed. */
853                         if (data->phase2_eap_started &&
854                             !data->phase2_eap_success) {
855                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 "
856                                            "Success used to indicate success, "
857                                            "but Phase 2 EAP was not yet "
858                                            "completed successfully");
859                                 ret->methodState = METHOD_DONE;
860                                 ret->decision = DECISION_FAIL;
861                                 wpabuf_free(in_decrypted);
862                                 return 0;
863                         }
864                         wpa_printf(MSG_DEBUG, "EAP-PEAP: Version 1 - "
865                                    "EAP-Success within TLS tunnel - "
866                                    "authentication completed");
867                         ret->decision = DECISION_UNCOND_SUCC;
868                         ret->methodState = METHOD_DONE;
869                         data->phase2_success = 1;
870                         if (data->peap_outer_success == 2) {
871                                 wpabuf_free(in_decrypted);
872                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Use TLS ACK "
873                                            "to finish authentication");
874                                 return 1;
875                         } else if (data->peap_outer_success == 1) {
876                                 /* Reply with EAP-Success within the TLS
877                                  * channel to complete the authentication. */
878                                 resp = wpabuf_alloc(sizeof(struct eap_hdr));
879                                 if (resp) {
880                                         rhdr = wpabuf_put(resp, sizeof(*rhdr));
881                                         rhdr->code = EAP_CODE_SUCCESS;
882                                         rhdr->identifier = hdr->identifier;
883                                         rhdr->length =
884                                                 host_to_be16(sizeof(*rhdr));
885                                 }
886                         } else {
887                                 /* No EAP-Success expected for Phase 1 (outer,
888                                  * unencrypted auth), so force EAP state
889                                  * machine to SUCCESS state. */
890                                 sm->peap_done = TRUE;
891                         }
892                 } else {
893                         /* FIX: ? */
894                 }
895                 break;
896         case EAP_CODE_FAILURE:
897                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure");
898                 ret->decision = DECISION_FAIL;
899                 ret->methodState = METHOD_MAY_CONT;
900                 ret->allowNotifications = FALSE;
901                 /* Reply with EAP-Failure within the TLS channel to complete
902                  * failure reporting. */
903                 resp = wpabuf_alloc(sizeof(struct eap_hdr));
904                 if (resp) {
905                         rhdr = wpabuf_put(resp, sizeof(*rhdr));
906                         rhdr->code = EAP_CODE_FAILURE;
907                         rhdr->identifier = hdr->identifier;
908                         rhdr->length = host_to_be16(sizeof(*rhdr));
909                 }
910                 break;
911         default:
912                 wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
913                            "Phase 2 EAP header", hdr->code);
914                 break;
915         }
916
917         wpabuf_free(in_decrypted);
918
919         if (resp) {
920                 int skip_change2 = 0;
921                 struct wpabuf *rmsg, buf;
922
923                 wpa_hexdump_buf_key(MSG_DEBUG,
924                                     "EAP-PEAP: Encrypting Phase 2 data", resp);
925                 /* PEAP version changes */
926                 if (wpabuf_len(resp) >= 5 &&
927                     wpabuf_head_u8(resp)[0] == EAP_CODE_RESPONSE &&
928                     eap_get_type(resp) == EAP_TYPE_TLV)
929                         skip_change2 = 1;
930                 rmsg = resp;
931                 if (data->peap_version == 0 && !skip_change2) {
932                         wpabuf_set(&buf, wpabuf_head_u8(resp) +
933                                    sizeof(struct eap_hdr),
934                                    wpabuf_len(resp) - sizeof(struct eap_hdr));
935                         rmsg = &buf;
936                 }
937
938                 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
939                                          data->peap_version, req->identifier,
940                                          rmsg, out_data)) {
941                         wpa_printf(MSG_INFO, "EAP-PEAP: Failed to encrypt "
942                                    "a Phase 2 frame");
943                 }
944                 wpabuf_free(resp);
945         }
946
947         return 0;
948 }
949
950
951 static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv,
952                                         struct eap_method_ret *ret,
953                                         const struct wpabuf *reqData)
954 {
955         const struct eap_hdr *req;
956         size_t left;
957         int res;
958         u8 flags, id;
959         struct wpabuf *resp;
960         const u8 *pos;
961         struct eap_peap_data *data = priv;
962
963         pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_PEAP, ret,
964                                         reqData, &left, &flags);
965         if (pos == NULL)
966                 return NULL;
967         req = wpabuf_head(reqData);
968         id = req->identifier;
969
970         if (flags & EAP_TLS_FLAGS_START) {
971                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Start (server ver=%d, own "
972                            "ver=%d)", flags & EAP_TLS_VERSION_MASK,
973                         data->peap_version);
974                 if ((flags & EAP_TLS_VERSION_MASK) < data->peap_version)
975                         data->peap_version = flags & EAP_TLS_VERSION_MASK;
976                 if (data->force_peap_version >= 0 &&
977                     data->force_peap_version != data->peap_version) {
978                         wpa_printf(MSG_WARNING, "EAP-PEAP: Failed to select "
979                                    "forced PEAP version %d",
980                                    data->force_peap_version);
981                         ret->methodState = METHOD_DONE;
982                         ret->decision = DECISION_FAIL;
983                         ret->allowNotifications = FALSE;
984                         return NULL;
985                 }
986                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Using PEAP version %d",
987                            data->peap_version);
988                 left = 0; /* make sure that this frame is empty, even though it
989                            * should always be, anyway */
990         }
991
992         resp = NULL;
993         if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
994             !data->resuming) {
995                 struct wpabuf msg;
996                 wpabuf_set(&msg, pos, left);
997                 res = eap_peap_decrypt(sm, data, ret, req, &msg, &resp);
998         } else {
999                 res = eap_peer_tls_process_helper(sm, &data->ssl,
1000                                                   EAP_TYPE_PEAP,
1001                                                   data->peap_version, id, pos,
1002                                                   left, &resp);
1003
1004                 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1005                         char *label;
1006                         wpa_printf(MSG_DEBUG,
1007                                    "EAP-PEAP: TLS done, proceed to Phase 2");
1008                         os_free(data->key_data);
1009                         /* draft-josefsson-ppext-eap-tls-eap-05.txt
1010                          * specifies that PEAPv1 would use "client PEAP
1011                          * encryption" as the label. However, most existing
1012                          * PEAPv1 implementations seem to be using the old
1013                          * label, "client EAP encryption", instead. Use the old
1014                          * label by default, but allow it to be configured with
1015                          * phase1 parameter peaplabel=1. */
1016                         if (data->force_new_label)
1017                                 label = "client PEAP encryption";
1018                         else
1019                                 label = "client EAP encryption";
1020                         wpa_printf(MSG_DEBUG, "EAP-PEAP: using label '%s' in "
1021                                    "key derivation", label);
1022                         data->key_data =
1023                                 eap_peer_tls_derive_key(sm, &data->ssl, label,
1024                                                         EAP_TLS_KEY_LEN);
1025                         if (data->key_data) {
1026                                 wpa_hexdump_key(MSG_DEBUG, 
1027                                                 "EAP-PEAP: Derived key",
1028                                                 data->key_data,
1029                                                 EAP_TLS_KEY_LEN);
1030                         } else {
1031                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to "
1032                                            "derive key");
1033                         }
1034
1035                         os_free(data->session_id);
1036                         data->session_id =
1037                                 eap_peer_tls_derive_session_id(sm, &data->ssl,
1038                                                                EAP_TYPE_PEAP,
1039                                                                &data->id_len);
1040                         if (data->session_id) {
1041                                 wpa_hexdump(MSG_DEBUG,
1042                                             "EAP-PEAP: Derived Session-Id",
1043                                             data->session_id, data->id_len);
1044                         } else {
1045                                 wpa_printf(MSG_ERROR, "EAP-PEAP: Failed to "
1046                                            "derive Session-Id");
1047                         }
1048
1049                         if (sm->workaround && data->resuming) {
1050                                 /*
1051                                  * At least few RADIUS servers (Aegis v1.1.6;
1052                                  * but not v1.1.4; and Cisco ACS) seem to be
1053                                  * terminating PEAPv1 (Aegis) or PEAPv0 (Cisco
1054                                  * ACS) session resumption with outer
1055                                  * EAP-Success. This does not seem to follow
1056                                  * draft-josefsson-pppext-eap-tls-eap-05.txt
1057                                  * section 4.2, so only allow this if EAP
1058                                  * workarounds are enabled.
1059                                  */
1060                                 wpa_printf(MSG_DEBUG, "EAP-PEAP: Workaround - "
1061                                            "allow outer EAP-Success to "
1062                                            "terminate PEAP resumption");
1063                                 ret->decision = DECISION_COND_SUCC;
1064                                 data->phase2_success = 1;
1065                         }
1066
1067                         data->resuming = 0;
1068                 }
1069
1070                 if (res == 2) {
1071                         struct wpabuf msg;
1072                         /*
1073                          * Application data included in the handshake message.
1074                          */
1075                         wpabuf_free(data->pending_phase2_req);
1076                         data->pending_phase2_req = resp;
1077                         resp = NULL;
1078                         wpabuf_set(&msg, pos, left);
1079                         res = eap_peap_decrypt(sm, data, ret, req, &msg,
1080                                                &resp);
1081                 }
1082         }
1083
1084         if (ret->methodState == METHOD_DONE) {
1085                 ret->allowNotifications = FALSE;
1086         }
1087
1088         if (res == 1) {
1089                 wpabuf_free(resp);
1090                 return eap_peer_tls_build_ack(id, EAP_TYPE_PEAP,
1091                                               data->peap_version);
1092         }
1093
1094         return resp;
1095 }
1096
1097
1098 static Boolean eap_peap_has_reauth_data(struct eap_sm *sm, void *priv)
1099 {
1100         struct eap_peap_data *data = priv;
1101         return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1102                 data->phase2_success;
1103 }
1104
1105
1106 static void eap_peap_deinit_for_reauth(struct eap_sm *sm, void *priv)
1107 {
1108         struct eap_peap_data *data = priv;
1109         wpabuf_free(data->pending_phase2_req);
1110         data->pending_phase2_req = NULL;
1111         data->crypto_binding_used = 0;
1112 }
1113
1114
1115 static void * eap_peap_init_for_reauth(struct eap_sm *sm, void *priv)
1116 {
1117         struct eap_peap_data *data = priv;
1118         os_free(data->key_data);
1119         data->key_data = NULL;
1120         os_free(data->session_id);
1121         data->session_id = NULL;
1122         if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1123                 os_free(data);
1124                 return NULL;
1125         }
1126         if (data->phase2_priv && data->phase2_method &&
1127             data->phase2_method->init_for_reauth)
1128                 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1129         data->phase2_success = 0;
1130         data->phase2_eap_success = 0;
1131         data->phase2_eap_started = 0;
1132         data->resuming = 1;
1133         data->reauth = 1;
1134         sm->peap_done = FALSE;
1135         return priv;
1136 }
1137
1138
1139 static int eap_peap_get_status(struct eap_sm *sm, void *priv, char *buf,
1140                                size_t buflen, int verbose)
1141 {
1142         struct eap_peap_data *data = priv;
1143         int len, ret;
1144
1145         len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1146         if (data->phase2_method) {
1147                 ret = os_snprintf(buf + len, buflen - len,
1148                                   "EAP-PEAPv%d Phase2 method=%s\n",
1149                                   data->peap_version,
1150                                   data->phase2_method->name);
1151                 if (ret < 0 || (size_t) ret >= buflen - len)
1152                         return len;
1153                 len += ret;
1154         }
1155         return len;
1156 }
1157
1158
1159 static Boolean eap_peap_isKeyAvailable(struct eap_sm *sm, void *priv)
1160 {
1161         struct eap_peap_data *data = priv;
1162         return data->key_data != NULL && data->phase2_success;
1163 }
1164
1165
1166 static u8 * eap_peap_getKey(struct eap_sm *sm, void *priv, size_t *len)
1167 {
1168         struct eap_peap_data *data = priv;
1169         u8 *key;
1170
1171         if (data->key_data == NULL || !data->phase2_success)
1172                 return NULL;
1173
1174         key = os_malloc(EAP_TLS_KEY_LEN);
1175         if (key == NULL)
1176                 return NULL;
1177
1178         *len = EAP_TLS_KEY_LEN;
1179
1180         if (data->crypto_binding_used) {
1181                 u8 csk[128];
1182                 /*
1183                  * Note: It looks like Microsoft implementation requires null
1184                  * termination for this label while the one used for deriving
1185                  * IPMK|CMK did not use null termination.
1186                  */
1187                 if (peap_prfplus(data->peap_version, data->ipmk, 40,
1188                                  "Session Key Generating Function",
1189                                  (u8 *) "\00", 1, csk, sizeof(csk)) < 0) {
1190                         os_free(key);
1191                         return NULL;
1192                 }
1193                 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk));
1194                 os_memcpy(key, csk, EAP_TLS_KEY_LEN);
1195                 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
1196                             key, EAP_TLS_KEY_LEN);
1197         } else
1198                 os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
1199
1200         return key;
1201 }
1202
1203
1204 static u8 * eap_peap_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1205 {
1206         struct eap_peap_data *data = priv;
1207         u8 *id;
1208
1209         if (data->session_id == NULL || !data->phase2_success)
1210                 return NULL;
1211
1212         id = os_malloc(data->id_len);
1213         if (id == NULL)
1214                 return NULL;
1215
1216         *len = data->id_len;
1217         os_memcpy(id, data->session_id, data->id_len);
1218
1219         return id;
1220 }
1221
1222
1223 int eap_peer_peap_register(void)
1224 {
1225         struct eap_method *eap;
1226         int ret;
1227
1228         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1229                                     EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP");
1230         if (eap == NULL)
1231                 return -1;
1232
1233         eap->init = eap_peap_init;
1234         eap->deinit = eap_peap_deinit;
1235         eap->process = eap_peap_process;
1236         eap->isKeyAvailable = eap_peap_isKeyAvailable;
1237         eap->getKey = eap_peap_getKey;
1238         eap->get_status = eap_peap_get_status;
1239         eap->has_reauth_data = eap_peap_has_reauth_data;
1240         eap->deinit_for_reauth = eap_peap_deinit_for_reauth;
1241         eap->init_for_reauth = eap_peap_init_for_reauth;
1242         eap->getSessionId = eap_peap_get_session_id;
1243
1244         ret = eap_peer_method_register(eap);
1245         if (ret)
1246                 eap_peer_method_free(eap);
1247         return ret;
1248 }