1 /*
2 * EAP peer: EAP-TLS/PEAP/TTLS/FAST common functions
3 * Copyright (c) 2004-2019, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10
11 #include "common.h"
12 #include "crypto/sha1.h"
13 #include "crypto/tls.h"
14 #include "eap_i.h"
15 #include "eap_tls_common.h"
16 #include "eap_config.h"
17
18
eap_tls_msg_alloc(enum eap_type type,size_t payload_len,u8 code,u8 identifier)19 static struct wpabuf * eap_tls_msg_alloc(enum eap_type type, size_t payload_len,
20 u8 code, u8 identifier)
21 {
22 if (type == EAP_UNAUTH_TLS_TYPE)
23 return eap_msg_alloc(EAP_VENDOR_UNAUTH_TLS,
24 EAP_VENDOR_TYPE_UNAUTH_TLS, payload_len,
25 code, identifier);
26 if (type == EAP_WFA_UNAUTH_TLS_TYPE)
27 return eap_msg_alloc(EAP_VENDOR_WFA_NEW,
28 EAP_VENDOR_WFA_UNAUTH_TLS, payload_len,
29 code, identifier);
30 return eap_msg_alloc(EAP_VENDOR_IETF, type, payload_len, code,
31 identifier);
32 }
33
34
eap_tls_check_blob(struct eap_sm * sm,const char ** name,const u8 ** data,size_t * data_len)35 static int eap_tls_check_blob(struct eap_sm *sm, const char **name,
36 const u8 **data, size_t *data_len)
37 {
38 const struct wpa_config_blob *blob;
39
40 if (*name == NULL || os_strncmp(*name, "blob://", 7) != 0)
41 return 0;
42
43 blob = eap_get_config_blob(sm, *name + 7);
44 if (blob == NULL) {
45 wpa_printf(MSG_ERROR, "%s: Named configuration blob '%s' not "
46 "found", __func__, *name + 7);
47 return -1;
48 }
49
50 *name = NULL;
51 *data = blob->data;
52 *data_len = blob->len;
53
54 return 0;
55 }
56
57
eap_tls_params_flags(struct tls_connection_params * params,const char * txt)58 static void eap_tls_params_flags(struct tls_connection_params *params,
59 const char *txt)
60 {
61 if (txt == NULL)
62 return;
63 if (os_strstr(txt, "tls_allow_md5=1"))
64 params->flags |= TLS_CONN_ALLOW_SIGN_RSA_MD5;
65 if (os_strstr(txt, "tls_disable_time_checks=1"))
66 params->flags |= TLS_CONN_DISABLE_TIME_CHECKS;
67 if (os_strstr(txt, "tls_disable_session_ticket=1"))
68 params->flags |= TLS_CONN_DISABLE_SESSION_TICKET;
69 if (os_strstr(txt, "tls_disable_session_ticket=0"))
70 params->flags &= ~TLS_CONN_DISABLE_SESSION_TICKET;
71 if (os_strstr(txt, "tls_disable_tlsv1_0=1"))
72 params->flags |= TLS_CONN_DISABLE_TLSv1_0;
73 if (os_strstr(txt, "tls_disable_tlsv1_0=0")) {
74 params->flags &= ~TLS_CONN_DISABLE_TLSv1_0;
75 params->flags |= TLS_CONN_ENABLE_TLSv1_0;
76 }
77 if (os_strstr(txt, "tls_disable_tlsv1_1=1"))
78 params->flags |= TLS_CONN_DISABLE_TLSv1_1;
79 if (os_strstr(txt, "tls_disable_tlsv1_1=0")) {
80 params->flags &= ~TLS_CONN_DISABLE_TLSv1_1;
81 params->flags |= TLS_CONN_ENABLE_TLSv1_1;
82 }
83 if (os_strstr(txt, "tls_disable_tlsv1_2=1"))
84 params->flags |= TLS_CONN_DISABLE_TLSv1_2;
85 if (os_strstr(txt, "tls_disable_tlsv1_2=0")) {
86 params->flags &= ~TLS_CONN_DISABLE_TLSv1_2;
87 params->flags |= TLS_CONN_ENABLE_TLSv1_2;
88 }
89 if (os_strstr(txt, "tls_disable_tlsv1_3=1"))
90 params->flags |= TLS_CONN_DISABLE_TLSv1_3;
91 if (os_strstr(txt, "tls_disable_tlsv1_3=0"))
92 params->flags &= ~TLS_CONN_DISABLE_TLSv1_3;
93 if (os_strstr(txt, "tls_ext_cert_check=1"))
94 params->flags |= TLS_CONN_EXT_CERT_CHECK;
95 if (os_strstr(txt, "tls_ext_cert_check=0"))
96 params->flags &= ~TLS_CONN_EXT_CERT_CHECK;
97 if (os_strstr(txt, "tls_suiteb=1"))
98 params->flags |= TLS_CONN_SUITEB;
99 if (os_strstr(txt, "tls_suiteb=0"))
100 params->flags &= ~TLS_CONN_SUITEB;
101 if (os_strstr(txt, "tls_suiteb_no_ecdh=1"))
102 params->flags |= TLS_CONN_SUITEB_NO_ECDH;
103 if (os_strstr(txt, "tls_suiteb_no_ecdh=0"))
104 params->flags &= ~TLS_CONN_SUITEB_NO_ECDH;
105 if (os_strstr(txt, "allow_unsafe_renegotiation=1"))
106 params->flags |= TLS_CONN_ALLOW_UNSAFE_RENEGOTIATION;
107 if (os_strstr(txt, "allow_unsafe_renegotiation=0"))
108 params->flags &= ~TLS_CONN_ALLOW_UNSAFE_RENEGOTIATION;
109 }
110
111
eap_tls_cert_params_from_conf(struct tls_connection_params * params,struct eap_peer_cert_config * config)112 static void eap_tls_cert_params_from_conf(struct tls_connection_params *params,
113 struct eap_peer_cert_config *config)
114 {
115 params->ca_cert = config->ca_cert;
116 params->ca_path = config->ca_path;
117 params->client_cert = config->client_cert;
118 params->private_key = config->private_key;
119 params->private_key_passwd = config->private_key_passwd;
120 params->subject_match = config->subject_match;
121 params->altsubject_match = config->altsubject_match;
122 params->check_cert_subject = config->check_cert_subject;
123 params->suffix_match = config->domain_suffix_match;
124 params->domain_match = config->domain_match;
125 params->engine = config->engine;
126 params->engine_id = config->engine_id;
127 params->pin = config->pin;
128 params->key_id = config->key_id;
129 params->cert_id = config->cert_id;
130 params->ca_cert_id = config->ca_cert_id;
131 if (config->ocsp)
132 params->flags |= TLS_CONN_REQUEST_OCSP;
133 if (config->ocsp >= 2)
134 params->flags |= TLS_CONN_REQUIRE_OCSP;
135 if (config->ocsp == 3)
136 params->flags |= TLS_CONN_REQUIRE_OCSP_ALL;
137 }
138
139
eap_tls_params_from_conf1(struct tls_connection_params * params,struct eap_peer_config * config)140 static void eap_tls_params_from_conf1(struct tls_connection_params *params,
141 struct eap_peer_config *config)
142 {
143 eap_tls_cert_params_from_conf(params, &config->cert);
144 eap_tls_params_flags(params, config->phase1);
145 }
146
147
eap_tls_params_from_conf2(struct tls_connection_params * params,struct eap_peer_config * config)148 static void eap_tls_params_from_conf2(struct tls_connection_params *params,
149 struct eap_peer_config *config)
150 {
151 eap_tls_cert_params_from_conf(params, &config->phase2_cert);
152 eap_tls_params_flags(params, config->phase2);
153 }
154
155
eap_tls_params_from_conf2m(struct tls_connection_params * params,struct eap_peer_config * config)156 static void eap_tls_params_from_conf2m(struct tls_connection_params *params,
157 struct eap_peer_config *config)
158 {
159 eap_tls_cert_params_from_conf(params, &config->machine_cert);
160 eap_tls_params_flags(params, config->machine_phase2);
161 }
162
163
eap_tls_params_from_conf(struct eap_sm * sm,struct eap_ssl_data * data,struct tls_connection_params * params,struct eap_peer_config * config,int phase2)164 static int eap_tls_params_from_conf(struct eap_sm *sm,
165 struct eap_ssl_data *data,
166 struct tls_connection_params *params,
167 struct eap_peer_config *config, int phase2)
168 {
169 os_memset(params, 0, sizeof(*params));
170 if (sm->workaround && data->eap_type != EAP_TYPE_FAST &&
171 data->eap_type != EAP_TYPE_TEAP) {
172 /*
173 * Some deployed authentication servers seem to be unable to
174 * handle the TLS Session Ticket extension (they are supposed
175 * to ignore unrecognized TLS extensions, but end up rejecting
176 * the ClientHello instead). As a workaround, disable use of
177 * TLS Sesson Ticket extension for EAP-TLS, EAP-PEAP, and
178 * EAP-TTLS (EAP-FAST uses session ticket, so any server that
179 * supports EAP-FAST does not need this workaround).
180 */
181 params->flags |= TLS_CONN_DISABLE_SESSION_TICKET;
182 }
183 if (data->eap_type == EAP_TYPE_TEAP) {
184 /* RFC 7170 requires TLS v1.2 or newer to be used with TEAP */
185 params->flags |= TLS_CONN_DISABLE_TLSv1_0 |
186 TLS_CONN_DISABLE_TLSv1_1;
187 if (config->teap_anon_dh)
188 params->flags |= TLS_CONN_TEAP_ANON_DH;
189 }
190 if (data->eap_type == EAP_TYPE_FAST ||
191 data->eap_type == EAP_TYPE_TEAP ||
192 data->eap_type == EAP_TYPE_TTLS ||
193 data->eap_type == EAP_TYPE_PEAP) {
194 /* The current EAP peer implementation is not yet ready for the
195 * TLS v1.3 changes, so disable this by default for now. */
196 params->flags |= TLS_CONN_DISABLE_TLSv1_3;
197 }
198 #ifndef EAP_TLSV1_3
199 if (data->eap_type == EAP_TYPE_TLS ||
200 data->eap_type == EAP_UNAUTH_TLS_TYPE ||
201 data->eap_type == EAP_WFA_UNAUTH_TLS_TYPE) {
202 /* While the current EAP-TLS implementation is more or less
203 * complete for TLS v1.3, there has been only minimal
204 * interoperability testing with other implementations, so
205 * disable it by default for now until there has been chance to
206 * confirm that no significant interoperability issues show up
207 * with TLS version update.
208 */
209 params->flags |= TLS_CONN_DISABLE_TLSv1_3;
210 }
211 #endif /* EAP_TLSV1_3 */
212 if (phase2 && sm->use_machine_cred) {
213 wpa_printf(MSG_DEBUG, "TLS: using machine config options");
214 eap_tls_params_from_conf2m(params, config);
215 } else if (phase2) {
216 wpa_printf(MSG_DEBUG, "TLS: using phase2 config options");
217 eap_tls_params_from_conf2(params, config);
218 } else {
219 wpa_printf(MSG_DEBUG, "TLS: using phase1 config options");
220 eap_tls_params_from_conf1(params, config);
221 if (data->eap_type == EAP_TYPE_FAST)
222 params->flags |= TLS_CONN_EAP_FAST;
223 }
224
225 /*
226 * Use blob data, if available. Otherwise, leave reference to external
227 * file as-is.
228 */
229 if (eap_tls_check_blob(sm, ¶ms->ca_cert, ¶ms->ca_cert_blob,
230 ¶ms->ca_cert_blob_len) ||
231 eap_tls_check_blob(sm, ¶ms->client_cert,
232 ¶ms->client_cert_blob,
233 ¶ms->client_cert_blob_len) ||
234 eap_tls_check_blob(sm, ¶ms->private_key,
235 ¶ms->private_key_blob,
236 ¶ms->private_key_blob_len)) {
237 wpa_printf(MSG_INFO, "SSL: Failed to get configuration blobs");
238 return -1;
239 }
240
241 params->openssl_ciphers = config->openssl_ciphers;
242
243 sm->ext_cert_check = !!(params->flags & TLS_CONN_EXT_CERT_CHECK);
244
245 if (!phase2)
246 data->client_cert_conf = params->client_cert ||
247 params->client_cert_blob ||
248 params->private_key ||
249 params->private_key_blob;
250
251 return 0;
252 }
253
254
eap_tls_init_connection(struct eap_sm * sm,struct eap_ssl_data * data,struct eap_peer_config * config,struct tls_connection_params * params)255 static int eap_tls_init_connection(struct eap_sm *sm,
256 struct eap_ssl_data *data,
257 struct eap_peer_config *config,
258 struct tls_connection_params *params)
259 {
260 int res;
261
262 data->conn = tls_connection_init(data->ssl_ctx);
263 if (data->conn == NULL) {
264 wpa_printf(MSG_INFO, "SSL: Failed to initialize new TLS "
265 "connection");
266 return -1;
267 }
268
269 res = tls_connection_set_params(data->ssl_ctx, data->conn, params);
270 if (res == TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN) {
271 /*
272 * At this point with the pkcs11 engine the PIN is wrong. We
273 * reset the PIN in the configuration to be sure to not use it
274 * again and the calling function must request a new one.
275 */
276 wpa_printf(MSG_INFO,
277 "TLS: Bad PIN provided, requesting a new one");
278 os_free(config->cert.pin);
279 config->cert.pin = NULL;
280 eap_sm_request_pin(sm);
281 sm->ignore = true;
282 } else if (res == TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED) {
283 wpa_printf(MSG_INFO, "TLS: Failed to initialize engine");
284 } else if (res == TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED) {
285 wpa_printf(MSG_INFO, "TLS: Failed to load private key");
286 sm->ignore = true;
287 }
288 if (res) {
289 wpa_printf(MSG_INFO, "TLS: Failed to set TLS connection "
290 "parameters");
291 tls_connection_deinit(data->ssl_ctx, data->conn);
292 data->conn = NULL;
293 return -1;
294 }
295
296 return 0;
297 }
298
299
300 /**
301 * eap_peer_tls_ssl_init - Initialize shared TLS functionality
302 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
303 * @data: Data for TLS processing
304 * @config: Pointer to the network configuration
305 * @eap_type: EAP method used in Phase 1 (EAP_TYPE_TLS/PEAP/TTLS/FAST)
306 * Returns: 0 on success, -1 on failure
307 *
308 * This function is used to initialize shared TLS functionality for EAP-TLS,
309 * EAP-PEAP, EAP-TTLS, and EAP-FAST.
310 */
eap_peer_tls_ssl_init(struct eap_sm * sm,struct eap_ssl_data * data,struct eap_peer_config * config,u8 eap_type)311 int eap_peer_tls_ssl_init(struct eap_sm *sm, struct eap_ssl_data *data,
312 struct eap_peer_config *config, u8 eap_type)
313 {
314 struct tls_connection_params params;
315
316 if (config == NULL)
317 return -1;
318
319 data->eap = sm;
320 data->eap_type = eap_type;
321 data->phase2 = sm->init_phase2;
322 data->ssl_ctx = sm->init_phase2 && sm->ssl_ctx2 ? sm->ssl_ctx2 :
323 sm->ssl_ctx;
324 if (eap_tls_params_from_conf(sm, data, ¶ms, config, data->phase2) <
325 0)
326 return -1;
327
328 if (eap_tls_init_connection(sm, data, config, ¶ms) < 0)
329 return -1;
330
331 data->tls_out_limit = config->fragment_size;
332 if (data->phase2) {
333 /* Limit the fragment size in the inner TLS authentication
334 * since the outer authentication with EAP-PEAP does not yet
335 * support fragmentation */
336 if (data->tls_out_limit > 100)
337 data->tls_out_limit -= 100;
338 }
339
340 if (config->phase1 &&
341 os_strstr(config->phase1, "include_tls_length=1")) {
342 wpa_printf(MSG_DEBUG, "TLS: Include TLS Message Length in "
343 "unfragmented packets");
344 data->include_tls_length = 1;
345 }
346
347 return 0;
348 }
349
350
351 /**
352 * eap_peer_tls_ssl_deinit - Deinitialize shared TLS functionality
353 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
354 * @data: Data for TLS processing
355 *
356 * This function deinitializes shared TLS functionality that was initialized
357 * with eap_peer_tls_ssl_init().
358 */
eap_peer_tls_ssl_deinit(struct eap_sm * sm,struct eap_ssl_data * data)359 void eap_peer_tls_ssl_deinit(struct eap_sm *sm, struct eap_ssl_data *data)
360 {
361 tls_connection_deinit(data->ssl_ctx, data->conn);
362 eap_peer_tls_reset_input(data);
363 eap_peer_tls_reset_output(data);
364 }
365
366
367 /**
368 * eap_peer_tls_derive_key - Derive a key based on TLS session data
369 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
370 * @data: Data for TLS processing
371 * @label: Label string for deriving the keys, e.g., "client EAP encryption"
372 * @context: Optional extra upper-layer context (max len 2^16)
373 * @context_len: The length of the context value
374 * @len: Length of the key material to generate (usually 64 for MSK)
375 * Returns: Pointer to allocated key on success or %NULL on failure
376 *
377 * This function uses TLS-PRF to generate pseudo-random data based on the TLS
378 * session data (client/server random and master key). Each key type may use a
379 * different label to bind the key usage into the generated material.
380 *
381 * The caller is responsible for freeing the returned buffer.
382 *
383 * Note: To provide the RFC 5705 context, the context variable must be non-NULL.
384 */
eap_peer_tls_derive_key(struct eap_sm * sm,struct eap_ssl_data * data,const char * label,const u8 * context,size_t context_len,size_t len)385 u8 * eap_peer_tls_derive_key(struct eap_sm *sm, struct eap_ssl_data *data,
386 const char *label, const u8 *context,
387 size_t context_len, size_t len)
388 {
389 u8 *out;
390
391 out = os_malloc(len);
392 if (out == NULL)
393 return NULL;
394
395 if (tls_connection_export_key(data->ssl_ctx, data->conn, label,
396 context, context_len, out, len)) {
397 os_free(out);
398 return NULL;
399 }
400
401 return out;
402 }
403
404
405 /**
406 * eap_peer_tls_derive_session_id - Derive a Session-Id based on TLS data
407 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
408 * @data: Data for TLS processing
409 * @eap_type: EAP method used in Phase 1 (EAP_TYPE_TLS/PEAP/TTLS/FAST)
410 * @len: Pointer to length of the session ID generated
411 * Returns: Pointer to allocated Session-Id on success or %NULL on failure
412 *
413 * This function derive the Session-Id based on the TLS session data
414 * (client/server random and method type).
415 *
416 * The caller is responsible for freeing the returned buffer.
417 */
eap_peer_tls_derive_session_id(struct eap_sm * sm,struct eap_ssl_data * data,u8 eap_type,size_t * len)418 u8 * eap_peer_tls_derive_session_id(struct eap_sm *sm,
419 struct eap_ssl_data *data, u8 eap_type,
420 size_t *len)
421 {
422 struct tls_random keys;
423 u8 *out;
424
425 if (data->tls_v13) {
426 u8 *id, *method_id;
427 const u8 context[] = { eap_type };
428
429 /* Session-Id = <EAP-Type> || Method-Id
430 * Method-Id = TLS-Exporter("EXPORTER_EAP_TLS_Method-Id",
431 * Type-Code, 64)
432 */
433 *len = 1 + 64;
434 id = os_malloc(*len);
435 if (!id)
436 return NULL;
437 method_id = eap_peer_tls_derive_key(
438 sm, data, "EXPORTER_EAP_TLS_Method-Id", context, 1, 64);
439 if (!method_id) {
440 os_free(id);
441 return NULL;
442 }
443 id[0] = eap_type;
444 os_memcpy(id + 1, method_id, 64);
445 os_free(method_id);
446 return id;
447 }
448
449 if (tls_connection_get_random(sm->ssl_ctx, data->conn, &keys) ||
450 keys.client_random == NULL || keys.server_random == NULL)
451 return NULL;
452
453 *len = 1 + keys.client_random_len + keys.server_random_len;
454 out = os_malloc(*len);
455 if (out == NULL)
456 return NULL;
457
458 /* Session-Id = EAP type || client.random || server.random */
459 out[0] = eap_type;
460 os_memcpy(out + 1, keys.client_random, keys.client_random_len);
461 os_memcpy(out + 1 + keys.client_random_len, keys.server_random,
462 keys.server_random_len);
463
464 return out;
465 }
466
467
468 /**
469 * eap_peer_tls_reassemble_fragment - Reassemble a received fragment
470 * @data: Data for TLS processing
471 * @in_data: Next incoming TLS segment
472 * Returns: 0 on success, 1 if more data is needed for the full message, or
473 * -1 on error
474 */
eap_peer_tls_reassemble_fragment(struct eap_ssl_data * data,const struct wpabuf * in_data)475 static int eap_peer_tls_reassemble_fragment(struct eap_ssl_data *data,
476 const struct wpabuf *in_data)
477 {
478 size_t tls_in_len, in_len;
479
480 tls_in_len = data->tls_in ? wpabuf_len(data->tls_in) : 0;
481 in_len = in_data ? wpabuf_len(in_data) : 0;
482
483 if (tls_in_len + in_len == 0) {
484 /* No message data received?! */
485 wpa_printf(MSG_WARNING, "SSL: Invalid reassembly state: "
486 "tls_in_left=%lu tls_in_len=%lu in_len=%lu",
487 (unsigned long) data->tls_in_left,
488 (unsigned long) tls_in_len,
489 (unsigned long) in_len);
490 eap_peer_tls_reset_input(data);
491 return -1;
492 }
493
494 if (tls_in_len + in_len > 65536) {
495 /*
496 * Limit length to avoid rogue servers from causing large
497 * memory allocations.
498 */
499 wpa_printf(MSG_INFO, "SSL: Too long TLS fragment (size over "
500 "64 kB)");
501 eap_peer_tls_reset_input(data);
502 return -1;
503 }
504
505 if (in_len > data->tls_in_left) {
506 /* Sender is doing something odd - reject message */
507 wpa_printf(MSG_INFO, "SSL: more data than TLS message length "
508 "indicated");
509 eap_peer_tls_reset_input(data);
510 return -1;
511 }
512
513 if (wpabuf_resize(&data->tls_in, in_len) < 0) {
514 wpa_printf(MSG_INFO, "SSL: Could not allocate memory for TLS "
515 "data");
516 eap_peer_tls_reset_input(data);
517 return -1;
518 }
519 if (in_data)
520 wpabuf_put_buf(data->tls_in, in_data);
521 data->tls_in_left -= in_len;
522
523 if (data->tls_in_left > 0) {
524 wpa_printf(MSG_DEBUG, "SSL: Need %lu bytes more input "
525 "data", (unsigned long) data->tls_in_left);
526 return 1;
527 }
528
529 return 0;
530 }
531
532
533 /**
534 * eap_peer_tls_data_reassemble - Reassemble TLS data
535 * @data: Data for TLS processing
536 * @in_data: Next incoming TLS segment
537 * @need_more_input: Variable for returning whether more input data is needed
538 * to reassemble this TLS packet
539 * Returns: Pointer to output data, %NULL on error or when more data is needed
540 * for the full message (in which case, *need_more_input is also set to 1).
541 *
542 * This function reassembles TLS fragments. Caller must not free the returned
543 * data buffer since an internal pointer to it is maintained.
544 */
eap_peer_tls_data_reassemble(struct eap_ssl_data * data,const struct wpabuf * in_data,int * need_more_input)545 static const struct wpabuf * eap_peer_tls_data_reassemble(
546 struct eap_ssl_data *data, const struct wpabuf *in_data,
547 int *need_more_input)
548 {
549 *need_more_input = 0;
550
551 if (data->tls_in_left > wpabuf_len(in_data) || data->tls_in) {
552 /* Message has fragments */
553 int res = eap_peer_tls_reassemble_fragment(data, in_data);
554 if (res) {
555 if (res == 1)
556 *need_more_input = 1;
557 return NULL;
558 }
559
560 /* Message is now fully reassembled. */
561 } else {
562 /* No fragments in this message, so just make a copy of it. */
563 data->tls_in_left = 0;
564 data->tls_in = wpabuf_dup(in_data);
565 if (data->tls_in == NULL)
566 return NULL;
567 }
568
569 return data->tls_in;
570 }
571
572
573 /**
574 * eap_tls_process_input - Process incoming TLS message
575 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
576 * @data: Data for TLS processing
577 * @in_data: Message received from the server
578 * @out_data: Buffer for returning a pointer to application data (if available)
579 * Returns: 0 on success, 1 if more input data is needed, 2 if application data
580 * is available, -1 on failure
581 */
eap_tls_process_input(struct eap_sm * sm,struct eap_ssl_data * data,const struct wpabuf * in_data,struct wpabuf ** out_data)582 static int eap_tls_process_input(struct eap_sm *sm, struct eap_ssl_data *data,
583 const struct wpabuf *in_data,
584 struct wpabuf **out_data)
585 {
586 const struct wpabuf *msg;
587 int need_more_input;
588 struct wpabuf *appl_data;
589
590 msg = eap_peer_tls_data_reassemble(data, in_data, &need_more_input);
591 if (msg == NULL)
592 return need_more_input ? 1 : -1;
593
594 /* Full TLS message reassembled - continue handshake processing */
595 if (data->tls_out) {
596 /* This should not happen.. */
597 wpa_printf(MSG_INFO, "SSL: eap_tls_process_input - pending "
598 "tls_out data even though tls_out_len = 0");
599 wpabuf_free(data->tls_out);
600 WPA_ASSERT(data->tls_out == NULL);
601 }
602 appl_data = NULL;
603 data->tls_out = tls_connection_handshake(data->ssl_ctx, data->conn,
604 msg, &appl_data);
605
606 eap_peer_tls_reset_input(data);
607
608 if (appl_data &&
609 tls_connection_established(data->ssl_ctx, data->conn) &&
610 !tls_connection_get_failed(data->ssl_ctx, data->conn)) {
611 wpa_hexdump_buf_key(MSG_MSGDUMP, "SSL: Application data",
612 appl_data);
613 *out_data = appl_data;
614 return 2;
615 }
616
617 wpabuf_free(appl_data);
618
619 return 0;
620 }
621
622
623 /**
624 * eap_tls_process_output - Process outgoing TLS message
625 * @data: Data for TLS processing
626 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
627 * @peap_version: Version number for EAP-PEAP/TTLS
628 * @id: EAP identifier for the response
629 * @ret: Return value to use on success
630 * @out_data: Buffer for returning the allocated output buffer
631 * Returns: ret (0 or 1) on success, -1 on failure
632 */
eap_tls_process_output(struct eap_ssl_data * data,enum eap_type eap_type,int peap_version,u8 id,int ret,struct wpabuf ** out_data)633 static int eap_tls_process_output(struct eap_ssl_data *data,
634 enum eap_type eap_type,
635 int peap_version, u8 id, int ret,
636 struct wpabuf **out_data)
637 {
638 size_t len;
639 u8 *flags;
640 int more_fragments, length_included;
641
642 if (data->tls_out == NULL)
643 return -1;
644 len = wpabuf_len(data->tls_out) - data->tls_out_pos;
645 wpa_printf(MSG_DEBUG, "SSL: %lu bytes left to be sent out (of total "
646 "%lu bytes)",
647 (unsigned long) len,
648 (unsigned long) wpabuf_len(data->tls_out));
649
650 /*
651 * Limit outgoing message to the configured maximum size. Fragment
652 * message if needed.
653 */
654 if (len > data->tls_out_limit) {
655 more_fragments = 1;
656 len = data->tls_out_limit;
657 wpa_printf(MSG_DEBUG, "SSL: sending %lu bytes, more fragments "
658 "will follow", (unsigned long) len);
659 } else
660 more_fragments = 0;
661
662 length_included = data->tls_out_pos == 0 &&
663 (wpabuf_len(data->tls_out) > data->tls_out_limit ||
664 data->include_tls_length);
665 if (!length_included &&
666 eap_type == EAP_TYPE_PEAP && peap_version == 0 &&
667 !tls_connection_established(data->eap->ssl_ctx, data->conn)) {
668 /*
669 * Windows Server 2008 NPS really wants to have the TLS Message
670 * length included in phase 0 even for unfragmented frames or
671 * it will get very confused with Compound MAC calculation and
672 * Outer TLVs.
673 */
674 length_included = 1;
675 }
676
677 *out_data = eap_tls_msg_alloc(eap_type, 1 + length_included * 4 + len,
678 EAP_CODE_RESPONSE, id);
679 if (*out_data == NULL)
680 return -1;
681
682 flags = wpabuf_put(*out_data, 1);
683 *flags = peap_version;
684 if (more_fragments)
685 *flags |= EAP_TLS_FLAGS_MORE_FRAGMENTS;
686 if (length_included) {
687 *flags |= EAP_TLS_FLAGS_LENGTH_INCLUDED;
688 wpabuf_put_be32(*out_data, wpabuf_len(data->tls_out));
689 }
690
691 wpabuf_put_data(*out_data,
692 wpabuf_head_u8(data->tls_out) + data->tls_out_pos,
693 len);
694 data->tls_out_pos += len;
695
696 if (!more_fragments)
697 eap_peer_tls_reset_output(data);
698
699 return ret;
700 }
701
702
703 /**
704 * eap_peer_tls_process_helper - Process TLS handshake message
705 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
706 * @data: Data for TLS processing
707 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
708 * @peap_version: Version number for EAP-PEAP/TTLS
709 * @id: EAP identifier for the response
710 * @in_data: Message received from the server
711 * @out_data: Buffer for returning a pointer to the response message
712 * Returns: 0 on success, 1 if more input data is needed, 2 if application data
713 * is available, or -1 on failure
714 *
715 * This function can be used to process TLS handshake messages. It reassembles
716 * the received fragments and uses a TLS library to process the messages. The
717 * response data from the TLS library is fragmented to suitable output messages
718 * that the caller can send out.
719 *
720 * out_data is used to return the response message if the return value of this
721 * function is 0, 2, or -1. In case of failure, the message is likely a TLS
722 * alarm message. The caller is responsible for freeing the allocated buffer if
723 * *out_data is not %NULL.
724 *
725 * This function is called for each received TLS message during the TLS
726 * handshake after eap_peer_tls_process_init() call and possible processing of
727 * TLS Flags field. Once the handshake has been completed, i.e., when
728 * tls_connection_established() returns 1, EAP method specific decrypting of
729 * the tunneled data is used.
730 */
eap_peer_tls_process_helper(struct eap_sm * sm,struct eap_ssl_data * data,enum eap_type eap_type,int peap_version,u8 id,const struct wpabuf * in_data,struct wpabuf ** out_data)731 int eap_peer_tls_process_helper(struct eap_sm *sm, struct eap_ssl_data *data,
732 enum eap_type eap_type, int peap_version,
733 u8 id, const struct wpabuf *in_data,
734 struct wpabuf **out_data)
735 {
736 int ret = 0;
737
738 *out_data = NULL;
739
740 if (data->tls_out && wpabuf_len(data->tls_out) > 0 &&
741 wpabuf_len(in_data) > 0) {
742 wpa_printf(MSG_DEBUG, "SSL: Received non-ACK when output "
743 "fragments are waiting to be sent out");
744 return -1;
745 }
746
747 if (data->tls_out == NULL || wpabuf_len(data->tls_out) == 0) {
748 /*
749 * No more data to send out - expect to receive more data from
750 * the AS.
751 */
752 int res = eap_tls_process_input(sm, data, in_data, out_data);
753 char buf[20];
754
755 if (res) {
756 /*
757 * Input processing failed (res = -1) or more data is
758 * needed (res = 1).
759 */
760 return res;
761 }
762
763 /*
764 * The incoming message has been reassembled and processed. The
765 * response was allocated into data->tls_out buffer.
766 */
767
768 if (tls_get_version(data->ssl_ctx, data->conn,
769 buf, sizeof(buf)) == 0) {
770 wpa_printf(MSG_DEBUG, "SSL: Using TLS version %s", buf);
771 data->tls_v13 = os_strcmp(buf, "TLSv1.3") == 0;
772 }
773 }
774
775 if (data->tls_out == NULL) {
776 /*
777 * No outgoing fragments remaining from the previous message
778 * and no new message generated. This indicates an error in TLS
779 * processing.
780 */
781 eap_peer_tls_reset_output(data);
782 return -1;
783 }
784
785 if (tls_connection_get_failed(data->ssl_ctx, data->conn)) {
786 /* TLS processing has failed - return error */
787 wpa_printf(MSG_DEBUG, "SSL: Failed - tls_out available to "
788 "report error (len=%u)",
789 (unsigned int) wpabuf_len(data->tls_out));
790 ret = -1;
791 /* TODO: clean pin if engine used? */
792 if (wpabuf_len(data->tls_out) == 0) {
793 wpabuf_free(data->tls_out);
794 data->tls_out = NULL;
795 return -1;
796 }
797 }
798
799 if (wpabuf_len(data->tls_out) == 0) {
800 /*
801 * TLS negotiation should now be complete since all other cases
802 * needing more data should have been caught above based on
803 * the TLS Message Length field.
804 */
805 wpa_printf(MSG_DEBUG, "SSL: No data to be sent out");
806 wpabuf_free(data->tls_out);
807 data->tls_out = NULL;
808 return 1;
809 }
810
811 /* Send the pending message (in fragments, if needed). */
812 return eap_tls_process_output(data, eap_type, peap_version, id, ret,
813 out_data);
814 }
815
816
817 /**
818 * eap_peer_tls_build_ack - Build a TLS ACK frame
819 * @id: EAP identifier for the response
820 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
821 * @peap_version: Version number for EAP-PEAP/TTLS
822 * Returns: Pointer to the allocated ACK frame or %NULL on failure
823 */
eap_peer_tls_build_ack(u8 id,enum eap_type eap_type,int peap_version)824 struct wpabuf * eap_peer_tls_build_ack(u8 id, enum eap_type eap_type,
825 int peap_version)
826 {
827 struct wpabuf *resp;
828
829 resp = eap_tls_msg_alloc(eap_type, 1, EAP_CODE_RESPONSE, id);
830 if (resp == NULL)
831 return NULL;
832 wpa_printf(MSG_DEBUG, "SSL: Building ACK (type=%d id=%d ver=%d)",
833 (int) eap_type, id, peap_version);
834 wpabuf_put_u8(resp, peap_version); /* Flags */
835 return resp;
836 }
837
838
839 /**
840 * eap_peer_tls_reauth_init - Re-initialize shared TLS for session resumption
841 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
842 * @data: Data for TLS processing
843 * Returns: 0 on success, -1 on failure
844 */
eap_peer_tls_reauth_init(struct eap_sm * sm,struct eap_ssl_data * data)845 int eap_peer_tls_reauth_init(struct eap_sm *sm, struct eap_ssl_data *data)
846 {
847 eap_peer_tls_reset_input(data);
848 eap_peer_tls_reset_output(data);
849 return tls_connection_shutdown(data->ssl_ctx, data->conn);
850 }
851
852
853 /**
854 * eap_peer_tls_status - Get TLS status
855 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
856 * @data: Data for TLS processing
857 * @buf: Buffer for status information
858 * @buflen: Maximum buffer length
859 * @verbose: Whether to include verbose status information
860 * Returns: Number of bytes written to buf.
861 */
eap_peer_tls_status(struct eap_sm * sm,struct eap_ssl_data * data,char * buf,size_t buflen,int verbose)862 int eap_peer_tls_status(struct eap_sm *sm, struct eap_ssl_data *data,
863 char *buf, size_t buflen, int verbose)
864 {
865 char version[20], name[128];
866 int len = 0, ret;
867
868 if (tls_get_version(data->ssl_ctx, data->conn, version,
869 sizeof(version)) < 0)
870 version[0] = '\0';
871 if (tls_get_cipher(data->ssl_ctx, data->conn, name, sizeof(name)) < 0)
872 name[0] = '\0';
873
874 ret = os_snprintf(buf + len, buflen - len,
875 "eap_tls_version=%s\n"
876 "EAP TLS cipher=%s\n"
877 "tls_session_reused=%d\n",
878 version, name,
879 tls_connection_resumed(data->ssl_ctx, data->conn));
880 if (os_snprintf_error(buflen - len, ret))
881 return len;
882 len += ret;
883
884 return len;
885 }
886
887
888 /**
889 * eap_peer_tls_process_init - Initial validation/processing of EAP requests
890 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
891 * @data: Data for TLS processing
892 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
893 * @ret: Return values from EAP request validation and processing
894 * @reqData: EAP request to be processed (eapReqData)
895 * @len: Buffer for returning length of the remaining payload
896 * @flags: Buffer for returning TLS flags
897 * Returns: Pointer to payload after TLS flags and length or %NULL on failure
898 *
899 * This function validates the EAP header and processes the optional TLS
900 * Message Length field. If this is the first fragment of a TLS message, the
901 * TLS reassembly code is initialized to receive the indicated number of bytes.
902 *
903 * EAP-TLS, EAP-PEAP, EAP-TTLS, and EAP-FAST methods are expected to use this
904 * function as the first step in processing received messages. They will need
905 * to process the flags (apart from Message Length Included) that are returned
906 * through the flags pointer and the message payload that will be returned (and
907 * the length is returned through the len pointer). Return values (ret) are set
908 * for continuation of EAP method processing. The caller is responsible for
909 * setting these to indicate completion (either success or failure) based on
910 * the authentication result.
911 */
eap_peer_tls_process_init(struct eap_sm * sm,struct eap_ssl_data * data,enum eap_type eap_type,struct eap_method_ret * ret,const struct wpabuf * reqData,size_t * len,u8 * flags)912 const u8 * eap_peer_tls_process_init(struct eap_sm *sm,
913 struct eap_ssl_data *data,
914 enum eap_type eap_type,
915 struct eap_method_ret *ret,
916 const struct wpabuf *reqData,
917 size_t *len, u8 *flags)
918 {
919 const u8 *pos;
920 size_t left;
921 unsigned int tls_msg_len;
922
923 if (tls_get_errors(data->ssl_ctx)) {
924 wpa_printf(MSG_INFO, "SSL: TLS errors detected");
925 ret->ignore = true;
926 return NULL;
927 }
928
929 if (eap_type == EAP_UNAUTH_TLS_TYPE)
930 pos = eap_hdr_validate(EAP_VENDOR_UNAUTH_TLS,
931 EAP_VENDOR_TYPE_UNAUTH_TLS, reqData,
932 &left);
933 else if (eap_type == EAP_WFA_UNAUTH_TLS_TYPE)
934 pos = eap_hdr_validate(EAP_VENDOR_WFA_NEW,
935 EAP_VENDOR_WFA_UNAUTH_TLS, reqData,
936 &left);
937 else
938 pos = eap_hdr_validate(EAP_VENDOR_IETF, eap_type, reqData,
939 &left);
940 if (pos == NULL) {
941 ret->ignore = true;
942 return NULL;
943 }
944 if (left == 0) {
945 wpa_printf(MSG_DEBUG, "SSL: Invalid TLS message: no Flags "
946 "octet included");
947 if (!sm->workaround) {
948 ret->ignore = true;
949 return NULL;
950 }
951
952 wpa_printf(MSG_DEBUG, "SSL: Workaround - assume no Flags "
953 "indicates ACK frame");
954 *flags = 0;
955 } else {
956 *flags = *pos++;
957 left--;
958 }
959 wpa_printf(MSG_DEBUG, "SSL: Received packet(len=%lu) - "
960 "Flags 0x%02x", (unsigned long) wpabuf_len(reqData),
961 *flags);
962 if (*flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) {
963 if (left < 4) {
964 wpa_printf(MSG_INFO, "SSL: Short frame with TLS "
965 "length");
966 ret->ignore = true;
967 return NULL;
968 }
969 tls_msg_len = WPA_GET_BE32(pos);
970 wpa_printf(MSG_DEBUG, "SSL: TLS Message Length: %d",
971 tls_msg_len);
972 if (data->tls_in_left == 0) {
973 data->tls_in_total = tls_msg_len;
974 data->tls_in_left = tls_msg_len;
975 wpabuf_free(data->tls_in);
976 data->tls_in = NULL;
977 }
978 pos += 4;
979 left -= 4;
980
981 if (left > tls_msg_len) {
982 wpa_printf(MSG_INFO, "SSL: TLS Message Length (%d "
983 "bytes) smaller than this fragment (%d "
984 "bytes)", (int) tls_msg_len, (int) left);
985 ret->ignore = true;
986 return NULL;
987 }
988 }
989
990 ret->ignore = false;
991 ret->methodState = METHOD_MAY_CONT;
992 ret->decision = DECISION_FAIL;
993 ret->allowNotifications = true;
994
995 *len = left;
996 return pos;
997 }
998
999
1000 /**
1001 * eap_peer_tls_reset_input - Reset input buffers
1002 * @data: Data for TLS processing
1003 *
1004 * This function frees any allocated memory for input buffers and resets input
1005 * state.
1006 */
eap_peer_tls_reset_input(struct eap_ssl_data * data)1007 void eap_peer_tls_reset_input(struct eap_ssl_data *data)
1008 {
1009 data->tls_in_left = data->tls_in_total = 0;
1010 wpabuf_free(data->tls_in);
1011 data->tls_in = NULL;
1012 }
1013
1014
1015 /**
1016 * eap_peer_tls_reset_output - Reset output buffers
1017 * @data: Data for TLS processing
1018 *
1019 * This function frees any allocated memory for output buffers and resets
1020 * output state.
1021 */
eap_peer_tls_reset_output(struct eap_ssl_data * data)1022 void eap_peer_tls_reset_output(struct eap_ssl_data *data)
1023 {
1024 data->tls_out_pos = 0;
1025 wpabuf_free(data->tls_out);
1026 data->tls_out = NULL;
1027 }
1028
1029
1030 /**
1031 * eap_peer_tls_decrypt - Decrypt received phase 2 TLS message
1032 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
1033 * @data: Data for TLS processing
1034 * @in_data: Message received from the server
1035 * @in_decrypted: Buffer for returning a pointer to the decrypted message
1036 * Returns: 0 on success, 1 if more input data is needed, or -1 on failure
1037 */
eap_peer_tls_decrypt(struct eap_sm * sm,struct eap_ssl_data * data,const struct wpabuf * in_data,struct wpabuf ** in_decrypted)1038 int eap_peer_tls_decrypt(struct eap_sm *sm, struct eap_ssl_data *data,
1039 const struct wpabuf *in_data,
1040 struct wpabuf **in_decrypted)
1041 {
1042 const struct wpabuf *msg;
1043 int need_more_input;
1044
1045 msg = eap_peer_tls_data_reassemble(data, in_data, &need_more_input);
1046 if (msg == NULL)
1047 return need_more_input ? 1 : -1;
1048
1049 *in_decrypted = tls_connection_decrypt(data->ssl_ctx, data->conn, msg);
1050 eap_peer_tls_reset_input(data);
1051 if (*in_decrypted == NULL) {
1052 wpa_printf(MSG_INFO, "SSL: Failed to decrypt Phase 2 data");
1053 return -1;
1054 }
1055 return 0;
1056 }
1057
1058
1059 /**
1060 * eap_peer_tls_encrypt - Encrypt phase 2 TLS message
1061 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
1062 * @data: Data for TLS processing
1063 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
1064 * @peap_version: Version number for EAP-PEAP/TTLS
1065 * @id: EAP identifier for the response
1066 * @in_data: Plaintext phase 2 data to encrypt or %NULL to continue fragments
1067 * @out_data: Buffer for returning a pointer to the encrypted response message
1068 * Returns: 0 on success, -1 on failure
1069 */
eap_peer_tls_encrypt(struct eap_sm * sm,struct eap_ssl_data * data,enum eap_type eap_type,int peap_version,u8 id,const struct wpabuf * in_data,struct wpabuf ** out_data)1070 int eap_peer_tls_encrypt(struct eap_sm *sm, struct eap_ssl_data *data,
1071 enum eap_type eap_type, int peap_version, u8 id,
1072 const struct wpabuf *in_data,
1073 struct wpabuf **out_data)
1074 {
1075 if (in_data) {
1076 eap_peer_tls_reset_output(data);
1077 data->tls_out = tls_connection_encrypt(data->ssl_ctx,
1078 data->conn, in_data);
1079 if (data->tls_out == NULL) {
1080 wpa_printf(MSG_INFO, "SSL: Failed to encrypt Phase 2 "
1081 "data (in_len=%lu)",
1082 (unsigned long) wpabuf_len(in_data));
1083 eap_peer_tls_reset_output(data);
1084 return -1;
1085 }
1086 }
1087
1088 return eap_tls_process_output(data, eap_type, peap_version, id, 0,
1089 out_data);
1090 }
1091
1092
1093 /**
1094 * eap_peer_select_phase2_methods - Select phase 2 EAP method
1095 * @config: Pointer to the network configuration
1096 * @prefix: 'phase2' configuration prefix, e.g., "auth="
1097 * @types: Buffer for returning allocated list of allowed EAP methods
1098 * @num_types: Buffer for returning number of allocated EAP methods
1099 * Returns: 0 on success, -1 on failure
1100 *
1101 * This function is used to parse EAP method list and select allowed methods
1102 * for Phase2 authentication.
1103 */
eap_peer_select_phase2_methods(struct eap_peer_config * config,const char * prefix,struct eap_method_type ** types,size_t * num_types,int use_machine_cred)1104 int eap_peer_select_phase2_methods(struct eap_peer_config *config,
1105 const char *prefix,
1106 struct eap_method_type **types,
1107 size_t *num_types, int use_machine_cred)
1108 {
1109 char *start, *pos, *buf;
1110 struct eap_method_type *methods = NULL, *_methods;
1111 u32 method;
1112 size_t num_methods = 0, prefix_len;
1113 const char *phase2;
1114
1115 if (!config)
1116 goto get_defaults;
1117 phase2 = use_machine_cred ? config->machine_phase2 : config->phase2;
1118 if (!phase2)
1119 goto get_defaults;
1120
1121 start = buf = os_strdup(phase2);
1122 if (buf == NULL)
1123 return -1;
1124
1125 prefix_len = os_strlen(prefix);
1126
1127 while (start && *start != '\0') {
1128 int vendor;
1129 pos = os_strstr(start, prefix);
1130 if (pos == NULL)
1131 break;
1132 if (start != pos && *(pos - 1) != ' ') {
1133 start = pos + prefix_len;
1134 continue;
1135 }
1136
1137 start = pos + prefix_len;
1138 pos = os_strchr(start, ' ');
1139 if (pos)
1140 *pos++ = '\0';
1141 method = eap_get_phase2_type(start, &vendor);
1142 if (vendor == EAP_VENDOR_IETF && method == EAP_TYPE_NONE) {
1143 wpa_printf(MSG_ERROR, "TLS: Unsupported Phase2 EAP "
1144 "method '%s'", start);
1145 os_free(methods);
1146 os_free(buf);
1147 return -1;
1148 } else {
1149 num_methods++;
1150 _methods = os_realloc_array(methods, num_methods,
1151 sizeof(*methods));
1152 if (_methods == NULL) {
1153 os_free(methods);
1154 os_free(buf);
1155 return -1;
1156 }
1157 methods = _methods;
1158 methods[num_methods - 1].vendor = vendor;
1159 methods[num_methods - 1].method = method;
1160 }
1161
1162 start = pos;
1163 }
1164
1165 os_free(buf);
1166
1167 get_defaults:
1168 if (methods == NULL)
1169 methods = eap_get_phase2_types(config, &num_methods);
1170
1171 if (methods == NULL) {
1172 wpa_printf(MSG_ERROR, "TLS: No Phase2 EAP methods available");
1173 return -1;
1174 }
1175 wpa_hexdump(MSG_DEBUG, "TLS: Phase2 EAP types",
1176 (u8 *) methods,
1177 num_methods * sizeof(struct eap_method_type));
1178
1179 *types = methods;
1180 *num_types = num_methods;
1181
1182 return 0;
1183 }
1184
1185
1186 /**
1187 * eap_peer_tls_phase2_nak - Generate EAP-Nak for Phase 2
1188 * @types: Buffer for returning allocated list of allowed EAP methods
1189 * @num_types: Buffer for returning number of allocated EAP methods
1190 * @hdr: EAP-Request header (and the following EAP type octet)
1191 * @resp: Buffer for returning the EAP-Nak message
1192 * Returns: 0 on success, -1 on failure
1193 */
eap_peer_tls_phase2_nak(struct eap_method_type * types,size_t num_types,struct eap_hdr * hdr,struct wpabuf ** resp)1194 int eap_peer_tls_phase2_nak(struct eap_method_type *types, size_t num_types,
1195 struct eap_hdr *hdr, struct wpabuf **resp)
1196 {
1197 u8 *pos = (u8 *) (hdr + 1);
1198 size_t i;
1199
1200 /* TODO: add support for expanded Nak */
1201 wpa_printf(MSG_DEBUG, "TLS: Phase 2 Request: Nak type=%d", *pos);
1202 wpa_hexdump(MSG_DEBUG, "TLS: Allowed Phase2 EAP types",
1203 (u8 *) types, num_types * sizeof(struct eap_method_type));
1204 *resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_NAK, num_types,
1205 EAP_CODE_RESPONSE, hdr->identifier);
1206 if (*resp == NULL)
1207 return -1;
1208
1209 for (i = 0; i < num_types; i++) {
1210 if (types[i].vendor == EAP_VENDOR_IETF &&
1211 types[i].method < 256)
1212 wpabuf_put_u8(*resp, types[i].method);
1213 }
1214
1215 eap_update_len(*resp);
1216
1217 return 0;
1218 }
1219