Line data Source code
1 : /*
2 : * EAP peer: EAP-TLS/PEAP/TTLS/FAST common functions
3 : * Copyright (c) 2004-2013, 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 :
19 1410 : static struct wpabuf * eap_tls_msg_alloc(EapType type, size_t payload_len,
20 : u8 code, u8 identifier)
21 : {
22 1410 : if (type == EAP_UNAUTH_TLS_TYPE)
23 8 : return eap_msg_alloc(EAP_VENDOR_UNAUTH_TLS,
24 : EAP_VENDOR_TYPE_UNAUTH_TLS, payload_len,
25 : code, identifier);
26 1402 : if (type == EAP_WFA_UNAUTH_TLS_TYPE)
27 8 : return eap_msg_alloc(EAP_VENDOR_WFA_NEW,
28 : EAP_VENDOR_WFA_UNAUTH_TLS, payload_len,
29 : code, identifier);
30 1394 : return eap_msg_alloc(EAP_VENDOR_IETF, type, payload_len, code,
31 : identifier);
32 : }
33 :
34 :
35 992 : 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 :
40 992 : if (*name == NULL || os_strncmp(*name, "blob://", 7) != 0)
41 985 : return 0;
42 :
43 7 : blob = eap_get_config_blob(sm, *name + 7);
44 7 : if (blob == NULL) {
45 0 : wpa_printf(MSG_ERROR, "%s: Named configuration blob '%s' not "
46 0 : "found", __func__, *name + 7);
47 0 : return -1;
48 : }
49 :
50 7 : *name = NULL;
51 7 : *data = blob->data;
52 7 : *data_len = blob->len;
53 :
54 7 : return 0;
55 : }
56 :
57 :
58 248 : static void eap_tls_params_flags(struct tls_connection_params *params,
59 : const char *txt)
60 : {
61 248 : if (txt == NULL)
62 458 : return;
63 38 : if (os_strstr(txt, "tls_allow_md5=1"))
64 0 : params->flags |= TLS_CONN_ALLOW_SIGN_RSA_MD5;
65 38 : if (os_strstr(txt, "tls_disable_time_checks=1"))
66 1 : params->flags |= TLS_CONN_DISABLE_TIME_CHECKS;
67 38 : if (os_strstr(txt, "tls_disable_session_ticket=1"))
68 0 : params->flags |= TLS_CONN_DISABLE_SESSION_TICKET;
69 38 : if (os_strstr(txt, "tls_disable_session_ticket=0"))
70 0 : params->flags &= ~TLS_CONN_DISABLE_SESSION_TICKET;
71 38 : if (os_strstr(txt, "tls_disable_tlsv1_1=1"))
72 0 : params->flags |= TLS_CONN_DISABLE_TLSv1_1;
73 38 : if (os_strstr(txt, "tls_disable_tlsv1_1=0"))
74 0 : params->flags &= ~TLS_CONN_DISABLE_TLSv1_1;
75 38 : if (os_strstr(txt, "tls_disable_tlsv1_2=1"))
76 0 : params->flags |= TLS_CONN_DISABLE_TLSv1_2;
77 38 : if (os_strstr(txt, "tls_disable_tlsv1_2=0"))
78 0 : params->flags &= ~TLS_CONN_DISABLE_TLSv1_2;
79 : }
80 :
81 :
82 247 : static void eap_tls_params_from_conf1(struct tls_connection_params *params,
83 : struct eap_peer_config *config)
84 : {
85 247 : params->ca_cert = (char *) config->ca_cert;
86 247 : params->ca_path = (char *) config->ca_path;
87 247 : params->client_cert = (char *) config->client_cert;
88 247 : params->private_key = (char *) config->private_key;
89 247 : params->private_key_passwd = (char *) config->private_key_passwd;
90 247 : params->dh_file = (char *) config->dh_file;
91 247 : params->subject_match = (char *) config->subject_match;
92 247 : params->altsubject_match = (char *) config->altsubject_match;
93 247 : params->suffix_match = config->domain_suffix_match;
94 247 : params->domain_match = config->domain_match;
95 247 : params->engine = config->engine;
96 247 : params->engine_id = config->engine_id;
97 247 : params->pin = config->pin;
98 247 : params->key_id = config->key_id;
99 247 : params->cert_id = config->cert_id;
100 247 : params->ca_cert_id = config->ca_cert_id;
101 247 : eap_tls_params_flags(params, config->phase1);
102 247 : }
103 :
104 :
105 1 : static void eap_tls_params_from_conf2(struct tls_connection_params *params,
106 : struct eap_peer_config *config)
107 : {
108 1 : params->ca_cert = (char *) config->ca_cert2;
109 1 : params->ca_path = (char *) config->ca_path2;
110 1 : params->client_cert = (char *) config->client_cert2;
111 1 : params->private_key = (char *) config->private_key2;
112 1 : params->private_key_passwd = (char *) config->private_key2_passwd;
113 1 : params->dh_file = (char *) config->dh_file2;
114 1 : params->subject_match = (char *) config->subject_match2;
115 1 : params->altsubject_match = (char *) config->altsubject_match2;
116 1 : params->suffix_match = config->domain_suffix_match2;
117 1 : params->domain_match = config->domain_match2;
118 1 : params->engine = config->engine2;
119 1 : params->engine_id = config->engine2_id;
120 1 : params->pin = config->pin2;
121 1 : params->key_id = config->key2_id;
122 1 : params->cert_id = config->cert2_id;
123 1 : params->ca_cert_id = config->ca_cert2_id;
124 1 : eap_tls_params_flags(params, config->phase2);
125 1 : }
126 :
127 :
128 248 : static int eap_tls_params_from_conf(struct eap_sm *sm,
129 : struct eap_ssl_data *data,
130 : struct tls_connection_params *params,
131 : struct eap_peer_config *config, int phase2)
132 : {
133 248 : os_memset(params, 0, sizeof(*params));
134 248 : if (sm->workaround && data->eap_type != EAP_TYPE_FAST) {
135 : /*
136 : * Some deployed authentication servers seem to be unable to
137 : * handle the TLS Session Ticket extension (they are supposed
138 : * to ignore unrecognized TLS extensions, but end up rejecting
139 : * the ClientHello instead). As a workaround, disable use of
140 : * TLS Sesson Ticket extension for EAP-TLS, EAP-PEAP, and
141 : * EAP-TTLS (EAP-FAST uses session ticket, so any server that
142 : * supports EAP-FAST does not need this workaround).
143 : */
144 225 : params->flags |= TLS_CONN_DISABLE_SESSION_TICKET;
145 : }
146 248 : if (phase2) {
147 1 : wpa_printf(MSG_DEBUG, "TLS: using phase2 config options");
148 1 : eap_tls_params_from_conf2(params, config);
149 : } else {
150 247 : wpa_printf(MSG_DEBUG, "TLS: using phase1 config options");
151 247 : eap_tls_params_from_conf1(params, config);
152 247 : if (data->eap_type == EAP_TYPE_FAST)
153 23 : params->flags |= TLS_CONN_EAP_FAST;
154 : }
155 :
156 : /*
157 : * Use blob data, if available. Otherwise, leave reference to external
158 : * file as-is.
159 : */
160 248 : if (eap_tls_check_blob(sm, ¶ms->ca_cert, ¶ms->ca_cert_blob,
161 248 : ¶ms->ca_cert_blob_len) ||
162 248 : eap_tls_check_blob(sm, ¶ms->client_cert,
163 : ¶ms->client_cert_blob,
164 248 : ¶ms->client_cert_blob_len) ||
165 248 : eap_tls_check_blob(sm, ¶ms->private_key,
166 : ¶ms->private_key_blob,
167 248 : ¶ms->private_key_blob_len) ||
168 248 : eap_tls_check_blob(sm, ¶ms->dh_file, ¶ms->dh_blob,
169 : ¶ms->dh_blob_len)) {
170 0 : wpa_printf(MSG_INFO, "SSL: Failed to get configuration blobs");
171 0 : return -1;
172 : }
173 :
174 248 : params->openssl_ciphers = config->openssl_ciphers;
175 :
176 248 : return 0;
177 : }
178 :
179 :
180 248 : static int eap_tls_init_connection(struct eap_sm *sm,
181 : struct eap_ssl_data *data,
182 : struct eap_peer_config *config,
183 : struct tls_connection_params *params)
184 : {
185 : int res;
186 :
187 248 : if (config->ocsp)
188 5 : params->flags |= TLS_CONN_REQUEST_OCSP;
189 248 : if (config->ocsp == 2)
190 4 : params->flags |= TLS_CONN_REQUIRE_OCSP;
191 248 : data->conn = tls_connection_init(data->ssl_ctx);
192 248 : if (data->conn == NULL) {
193 0 : wpa_printf(MSG_INFO, "SSL: Failed to initialize new TLS "
194 : "connection");
195 0 : return -1;
196 : }
197 :
198 248 : res = tls_connection_set_params(data->ssl_ctx, data->conn, params);
199 248 : if (res == TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED) {
200 : /*
201 : * At this point with the pkcs11 engine the PIN might be wrong.
202 : * We reset the PIN in the configuration to be sure to not use
203 : * it again and the calling function must request a new one.
204 : */
205 0 : os_free(config->pin);
206 0 : config->pin = NULL;
207 248 : } else if (res == TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED) {
208 0 : wpa_printf(MSG_INFO, "TLS: Failed to load private key");
209 : /*
210 : * We do not know exactly but maybe the PIN was wrong,
211 : * so ask for a new one.
212 : */
213 0 : os_free(config->pin);
214 0 : config->pin = NULL;
215 0 : eap_sm_request_pin(sm);
216 0 : sm->ignore = TRUE;
217 0 : tls_connection_deinit(data->ssl_ctx, data->conn);
218 0 : data->conn = NULL;
219 0 : return -1;
220 248 : } else if (res) {
221 4 : wpa_printf(MSG_INFO, "TLS: Failed to set TLS connection "
222 : "parameters");
223 4 : tls_connection_deinit(data->ssl_ctx, data->conn);
224 4 : data->conn = NULL;
225 4 : return -1;
226 : }
227 :
228 244 : return 0;
229 : }
230 :
231 :
232 : /**
233 : * eap_peer_tls_ssl_init - Initialize shared TLS functionality
234 : * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
235 : * @data: Data for TLS processing
236 : * @config: Pointer to the network configuration
237 : * @eap_type: EAP method used in Phase 1 (EAP_TYPE_TLS/PEAP/TTLS/FAST)
238 : * Returns: 0 on success, -1 on failure
239 : *
240 : * This function is used to initialize shared TLS functionality for EAP-TLS,
241 : * EAP-PEAP, EAP-TTLS, and EAP-FAST.
242 : */
243 248 : int eap_peer_tls_ssl_init(struct eap_sm *sm, struct eap_ssl_data *data,
244 : struct eap_peer_config *config, u8 eap_type)
245 : {
246 : struct tls_connection_params params;
247 :
248 248 : if (config == NULL)
249 0 : return -1;
250 :
251 248 : data->eap = sm;
252 248 : data->eap_type = eap_type;
253 248 : data->phase2 = sm->init_phase2;
254 248 : data->ssl_ctx = sm->init_phase2 && sm->ssl_ctx2 ? sm->ssl_ctx2 :
255 : sm->ssl_ctx;
256 248 : if (eap_tls_params_from_conf(sm, data, ¶ms, config, data->phase2) <
257 : 0)
258 0 : return -1;
259 :
260 248 : if (eap_tls_init_connection(sm, data, config, ¶ms) < 0)
261 4 : return -1;
262 :
263 244 : data->tls_out_limit = config->fragment_size;
264 244 : if (data->phase2) {
265 : /* Limit the fragment size in the inner TLS authentication
266 : * since the outer authentication with EAP-PEAP does not yet
267 : * support fragmentation */
268 1 : if (data->tls_out_limit > 100)
269 1 : data->tls_out_limit -= 100;
270 : }
271 :
272 281 : if (config->phase1 &&
273 37 : os_strstr(config->phase1, "include_tls_length=1")) {
274 0 : wpa_printf(MSG_DEBUG, "TLS: Include TLS Message Length in "
275 : "unfragmented packets");
276 0 : data->include_tls_length = 1;
277 : }
278 :
279 244 : return 0;
280 : }
281 :
282 :
283 : /**
284 : * eap_peer_tls_ssl_deinit - Deinitialize shared TLS functionality
285 : * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
286 : * @data: Data for TLS processing
287 : *
288 : * This function deinitializes shared TLS functionality that was initialized
289 : * with eap_peer_tls_ssl_init().
290 : */
291 248 : void eap_peer_tls_ssl_deinit(struct eap_sm *sm, struct eap_ssl_data *data)
292 : {
293 248 : tls_connection_deinit(data->ssl_ctx, data->conn);
294 248 : eap_peer_tls_reset_input(data);
295 248 : eap_peer_tls_reset_output(data);
296 248 : }
297 :
298 :
299 : /**
300 : * eap_peer_tls_derive_key - Derive a key based on TLS session data
301 : * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
302 : * @data: Data for TLS processing
303 : * @label: Label string for deriving the keys, e.g., "client EAP encryption"
304 : * @len: Length of the key material to generate (usually 64 for MSK)
305 : * Returns: Pointer to allocated key on success or %NULL on failure
306 : *
307 : * This function uses TLS-PRF to generate pseudo-random data based on the TLS
308 : * session data (client/server random and master key). Each key type may use a
309 : * different label to bind the key usage into the generated material.
310 : *
311 : * The caller is responsible for freeing the returned buffer.
312 : */
313 317 : u8 * eap_peer_tls_derive_key(struct eap_sm *sm, struct eap_ssl_data *data,
314 : const char *label, size_t len)
315 : {
316 : #ifndef CONFIG_FIPS
317 : struct tls_keys keys;
318 : #endif /* CONFIG_FIPS */
319 317 : u8 *rnd = NULL, *out;
320 :
321 317 : out = os_malloc(len);
322 317 : if (out == NULL)
323 0 : return NULL;
324 :
325 : /* First, try to use TLS library function for PRF, if available. */
326 317 : if (tls_connection_prf(data->ssl_ctx, data->conn, label, 0, out, len)
327 : == 0)
328 317 : return out;
329 :
330 : #ifndef CONFIG_FIPS
331 : /*
332 : * TLS library did not support key generation, so get the needed TLS
333 : * session parameters and use an internal implementation of TLS PRF to
334 : * derive the key.
335 : */
336 0 : if (tls_connection_get_keys(data->ssl_ctx, data->conn, &keys))
337 0 : goto fail;
338 :
339 0 : if (keys.client_random == NULL || keys.server_random == NULL ||
340 0 : keys.master_key == NULL)
341 : goto fail;
342 :
343 0 : rnd = os_malloc(keys.client_random_len + keys.server_random_len);
344 0 : if (rnd == NULL)
345 0 : goto fail;
346 0 : os_memcpy(rnd, keys.client_random, keys.client_random_len);
347 0 : os_memcpy(rnd + keys.client_random_len, keys.server_random,
348 : keys.server_random_len);
349 :
350 0 : if (tls_prf_sha1_md5(keys.master_key, keys.master_key_len,
351 0 : label, rnd, keys.client_random_len +
352 0 : keys.server_random_len, out, len))
353 0 : goto fail;
354 :
355 0 : os_free(rnd);
356 0 : return out;
357 :
358 : fail:
359 : #endif /* CONFIG_FIPS */
360 0 : os_free(out);
361 0 : os_free(rnd);
362 0 : return NULL;
363 : }
364 :
365 :
366 : /**
367 : * eap_peer_tls_derive_session_id - Derive a Session-Id based on TLS data
368 : * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
369 : * @data: Data for TLS processing
370 : * @eap_type: EAP method used in Phase 1 (EAP_TYPE_TLS/PEAP/TTLS/FAST)
371 : * @len: Pointer to length of the session ID generated
372 : * Returns: Pointer to allocated Session-Id on success or %NULL on failure
373 : *
374 : * This function derive the Session-Id based on the TLS session data
375 : * (client/server random and method type).
376 : *
377 : * The caller is responsible for freeing the returned buffer.
378 : */
379 229 : u8 * eap_peer_tls_derive_session_id(struct eap_sm *sm,
380 : struct eap_ssl_data *data, u8 eap_type,
381 : size_t *len)
382 : {
383 : struct tls_keys keys;
384 : u8 *out;
385 :
386 229 : if (tls_connection_get_keys(sm->ssl_ctx, data->conn, &keys))
387 0 : return NULL;
388 :
389 229 : if (keys.client_random == NULL || keys.server_random == NULL)
390 0 : return NULL;
391 :
392 229 : *len = 1 + keys.client_random_len + keys.server_random_len;
393 229 : out = os_malloc(*len);
394 229 : if (out == NULL)
395 0 : return NULL;
396 :
397 : /* Session-Id = EAP type || client.random || server.random */
398 229 : out[0] = eap_type;
399 229 : os_memcpy(out + 1, keys.client_random, keys.client_random_len);
400 229 : os_memcpy(out + 1 + keys.client_random_len, keys.server_random,
401 : keys.server_random_len);
402 :
403 229 : return out;
404 : }
405 :
406 :
407 : /**
408 : * eap_peer_tls_reassemble_fragment - Reassemble a received fragment
409 : * @data: Data for TLS processing
410 : * @in_data: Next incoming TLS segment
411 : * Returns: 0 on success, 1 if more data is needed for the full message, or
412 : * -1 on error
413 : */
414 441 : static int eap_peer_tls_reassemble_fragment(struct eap_ssl_data *data,
415 : const struct wpabuf *in_data)
416 : {
417 : size_t tls_in_len, in_len;
418 :
419 441 : tls_in_len = data->tls_in ? wpabuf_len(data->tls_in) : 0;
420 441 : in_len = in_data ? wpabuf_len(in_data) : 0;
421 :
422 441 : if (tls_in_len + in_len == 0) {
423 : /* No message data received?! */
424 0 : wpa_printf(MSG_WARNING, "SSL: Invalid reassembly state: "
425 : "tls_in_left=%lu tls_in_len=%lu in_len=%lu",
426 : (unsigned long) data->tls_in_left,
427 : (unsigned long) tls_in_len,
428 : (unsigned long) in_len);
429 0 : eap_peer_tls_reset_input(data);
430 0 : return -1;
431 : }
432 :
433 441 : if (tls_in_len + in_len > 65536) {
434 : /*
435 : * Limit length to avoid rogue servers from causing large
436 : * memory allocations.
437 : */
438 0 : wpa_printf(MSG_INFO, "SSL: Too long TLS fragment (size over "
439 : "64 kB)");
440 0 : eap_peer_tls_reset_input(data);
441 0 : return -1;
442 : }
443 :
444 441 : if (in_len > data->tls_in_left) {
445 : /* Sender is doing something odd - reject message */
446 0 : wpa_printf(MSG_INFO, "SSL: more data than TLS message length "
447 : "indicated");
448 0 : eap_peer_tls_reset_input(data);
449 0 : return -1;
450 : }
451 :
452 441 : if (wpabuf_resize(&data->tls_in, in_len) < 0) {
453 0 : wpa_printf(MSG_INFO, "SSL: Could not allocate memory for TLS "
454 : "data");
455 0 : eap_peer_tls_reset_input(data);
456 0 : return -1;
457 : }
458 441 : if (in_data)
459 441 : wpabuf_put_buf(data->tls_in, in_data);
460 441 : data->tls_in_left -= in_len;
461 :
462 441 : if (data->tls_in_left > 0) {
463 225 : wpa_printf(MSG_DEBUG, "SSL: Need %lu bytes more input "
464 : "data", (unsigned long) data->tls_in_left);
465 225 : return 1;
466 : }
467 :
468 216 : return 0;
469 : }
470 :
471 :
472 : /**
473 : * eap_peer_tls_data_reassemble - Reassemble TLS data
474 : * @data: Data for TLS processing
475 : * @in_data: Next incoming TLS segment
476 : * @need_more_input: Variable for returning whether more input data is needed
477 : * to reassemble this TLS packet
478 : * Returns: Pointer to output data, %NULL on error or when more data is needed
479 : * for the full message (in which case, *need_more_input is also set to 1).
480 : *
481 : * This function reassembles TLS fragments. Caller must not free the returned
482 : * data buffer since an internal pointer to it is maintained.
483 : */
484 1339 : static const struct wpabuf * eap_peer_tls_data_reassemble(
485 : struct eap_ssl_data *data, const struct wpabuf *in_data,
486 : int *need_more_input)
487 : {
488 1339 : *need_more_input = 0;
489 :
490 1555 : if (data->tls_in_left > wpabuf_len(in_data) || data->tls_in) {
491 : /* Message has fragments */
492 441 : int res = eap_peer_tls_reassemble_fragment(data, in_data);
493 441 : if (res) {
494 225 : if (res == 1)
495 225 : *need_more_input = 1;
496 225 : return NULL;
497 : }
498 :
499 : /* Message is now fully reassembled. */
500 : } else {
501 : /* No fragments in this message, so just make a copy of it. */
502 898 : data->tls_in_left = 0;
503 898 : data->tls_in = wpabuf_dup(in_data);
504 898 : if (data->tls_in == NULL)
505 0 : return NULL;
506 : }
507 :
508 1114 : return data->tls_in;
509 : }
510 :
511 :
512 : /**
513 : * eap_tls_process_input - Process incoming TLS message
514 : * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
515 : * @data: Data for TLS processing
516 : * @in_data: Message received from the server
517 : * @in_len: Length of in_data
518 : * @out_data: Buffer for returning a pointer to application data (if available)
519 : * Returns: 0 on success, 1 if more input data is needed, 2 if application data
520 : * is available, -1 on failure
521 : */
522 968 : static int eap_tls_process_input(struct eap_sm *sm, struct eap_ssl_data *data,
523 : const u8 *in_data, size_t in_len,
524 : struct wpabuf **out_data)
525 : {
526 : const struct wpabuf *msg;
527 : int need_more_input;
528 : struct wpabuf *appl_data;
529 : struct wpabuf buf;
530 :
531 968 : wpabuf_set(&buf, in_data, in_len);
532 968 : msg = eap_peer_tls_data_reassemble(data, &buf, &need_more_input);
533 968 : if (msg == NULL)
534 225 : return need_more_input ? 1 : -1;
535 :
536 : /* Full TLS message reassembled - continue handshake processing */
537 743 : if (data->tls_out) {
538 : /* This should not happen.. */
539 0 : wpa_printf(MSG_INFO, "SSL: eap_tls_process_input - pending "
540 : "tls_out data even though tls_out_len = 0");
541 0 : wpabuf_free(data->tls_out);
542 : WPA_ASSERT(data->tls_out == NULL);
543 : }
544 743 : appl_data = NULL;
545 743 : data->tls_out = tls_connection_handshake(data->ssl_ctx, data->conn,
546 : msg, &appl_data);
547 :
548 743 : eap_peer_tls_reset_input(data);
549 :
550 754 : if (appl_data &&
551 22 : tls_connection_established(data->ssl_ctx, data->conn) &&
552 11 : !tls_connection_get_failed(data->ssl_ctx, data->conn)) {
553 11 : wpa_hexdump_buf_key(MSG_MSGDUMP, "SSL: Application data",
554 : appl_data);
555 11 : *out_data = appl_data;
556 11 : return 2;
557 : }
558 :
559 732 : wpabuf_free(appl_data);
560 :
561 732 : return 0;
562 : }
563 :
564 :
565 : /**
566 : * eap_tls_process_output - Process outgoing TLS message
567 : * @data: Data for TLS processing
568 : * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
569 : * @peap_version: Version number for EAP-PEAP/TTLS
570 : * @id: EAP identifier for the response
571 : * @ret: Return value to use on success
572 : * @out_data: Buffer for returning the allocated output buffer
573 : * Returns: ret (0 or 1) on success, -1 on failure
574 : */
575 1024 : static int eap_tls_process_output(struct eap_ssl_data *data, EapType eap_type,
576 : int peap_version, u8 id, int ret,
577 : struct wpabuf **out_data)
578 : {
579 : size_t len;
580 : u8 *flags;
581 : int more_fragments, length_included;
582 :
583 1024 : if (data->tls_out == NULL)
584 0 : return -1;
585 1024 : len = wpabuf_len(data->tls_out) - data->tls_out_pos;
586 1024 : wpa_printf(MSG_DEBUG, "SSL: %lu bytes left to be sent out (of total "
587 : "%lu bytes)",
588 : (unsigned long) len,
589 1024 : (unsigned long) wpabuf_len(data->tls_out));
590 :
591 : /*
592 : * Limit outgoing message to the configured maximum size. Fragment
593 : * message if needed.
594 : */
595 1024 : if (len > data->tls_out_limit) {
596 73 : more_fragments = 1;
597 73 : len = data->tls_out_limit;
598 73 : wpa_printf(MSG_DEBUG, "SSL: sending %lu bytes, more fragments "
599 : "will follow", (unsigned long) len);
600 : } else
601 951 : more_fragments = 0;
602 :
603 1999 : length_included = data->tls_out_pos == 0 &&
604 1881 : (wpabuf_len(data->tls_out) > data->tls_out_limit ||
605 929 : data->include_tls_length);
606 1024 : if (!length_included &&
607 251 : eap_type == EAP_TYPE_PEAP && peap_version == 0 &&
608 56 : !tls_connection_established(data->eap->ssl_ctx, data->conn)) {
609 : /*
610 : * Windows Server 2008 NPS really wants to have the TLS Message
611 : * length included in phase 0 even for unfragmented frames or
612 : * it will get very confused with Compound MAC calculation and
613 : * Outer TLVs.
614 : */
615 18 : length_included = 1;
616 : }
617 :
618 1024 : *out_data = eap_tls_msg_alloc(eap_type, 1 + length_included * 4 + len,
619 : EAP_CODE_RESPONSE, id);
620 1024 : if (*out_data == NULL)
621 0 : return -1;
622 :
623 1024 : flags = wpabuf_put(*out_data, 1);
624 1024 : *flags = peap_version;
625 1024 : if (more_fragments)
626 73 : *flags |= EAP_TLS_FLAGS_MORE_FRAGMENTS;
627 1024 : if (length_included) {
628 41 : *flags |= EAP_TLS_FLAGS_LENGTH_INCLUDED;
629 41 : wpabuf_put_be32(*out_data, wpabuf_len(data->tls_out));
630 : }
631 :
632 1024 : wpabuf_put_data(*out_data,
633 1024 : wpabuf_head_u8(data->tls_out) + data->tls_out_pos,
634 : len);
635 1024 : data->tls_out_pos += len;
636 :
637 1024 : if (!more_fragments)
638 951 : eap_peer_tls_reset_output(data);
639 :
640 1024 : return ret;
641 : }
642 :
643 :
644 : /**
645 : * eap_peer_tls_process_helper - Process TLS handshake message
646 : * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
647 : * @data: Data for TLS processing
648 : * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
649 : * @peap_version: Version number for EAP-PEAP/TTLS
650 : * @id: EAP identifier for the response
651 : * @in_data: Message received from the server
652 : * @in_len: Length of in_data
653 : * @out_data: Buffer for returning a pointer to the response message
654 : * Returns: 0 on success, 1 if more input data is needed, 2 if application data
655 : * is available, or -1 on failure
656 : *
657 : * This function can be used to process TLS handshake messages. It reassembles
658 : * the received fragments and uses a TLS library to process the messages. The
659 : * response data from the TLS library is fragmented to suitable output messages
660 : * that the caller can send out.
661 : *
662 : * out_data is used to return the response message if the return value of this
663 : * function is 0, 2, or -1. In case of failure, the message is likely a TLS
664 : * alarm message. The caller is responsible for freeing the allocated buffer if
665 : * *out_data is not %NULL.
666 : *
667 : * This function is called for each received TLS message during the TLS
668 : * handshake after eap_peer_tls_process_init() call and possible processing of
669 : * TLS Flags field. Once the handshake has been completed, i.e., when
670 : * tls_connection_established() returns 1, EAP method specific decrypting of
671 : * the tunneled data is used.
672 : */
673 1034 : int eap_peer_tls_process_helper(struct eap_sm *sm, struct eap_ssl_data *data,
674 : EapType eap_type, int peap_version,
675 : u8 id, const u8 *in_data, size_t in_len,
676 : struct wpabuf **out_data)
677 : {
678 1034 : int ret = 0;
679 :
680 1034 : *out_data = NULL;
681 :
682 1034 : if (data->tls_out && wpabuf_len(data->tls_out) > 0 && in_len > 0) {
683 0 : wpa_printf(MSG_DEBUG, "SSL: Received non-ACK when output "
684 : "fragments are waiting to be sent out");
685 0 : return -1;
686 : }
687 :
688 1034 : if (data->tls_out == NULL || wpabuf_len(data->tls_out) == 0) {
689 : /*
690 : * No more data to send out - expect to receive more data from
691 : * the AS.
692 : */
693 968 : int res = eap_tls_process_input(sm, data, in_data, in_len,
694 : out_data);
695 968 : if (res) {
696 : /*
697 : * Input processing failed (res = -1) or more data is
698 : * needed (res = 1).
699 : */
700 236 : return res;
701 : }
702 :
703 : /*
704 : * The incoming message has been reassembled and processed. The
705 : * response was allocated into data->tls_out buffer.
706 : */
707 : }
708 :
709 798 : if (data->tls_out == NULL) {
710 : /*
711 : * No outgoing fragments remaining from the previous message
712 : * and no new message generated. This indicates an error in TLS
713 : * processing.
714 : */
715 0 : eap_peer_tls_reset_output(data);
716 0 : return -1;
717 : }
718 :
719 798 : if (tls_connection_get_failed(data->ssl_ctx, data->conn)) {
720 : /* TLS processing has failed - return error */
721 25 : wpa_printf(MSG_DEBUG, "SSL: Failed - tls_out available to "
722 : "report error");
723 25 : ret = -1;
724 : /* TODO: clean pin if engine used? */
725 : }
726 :
727 798 : if (data->tls_out == NULL || wpabuf_len(data->tls_out) == 0) {
728 : /*
729 : * TLS negotiation should now be complete since all other cases
730 : * needing more data should have been caught above based on
731 : * the TLS Message Length field.
732 : */
733 212 : wpa_printf(MSG_DEBUG, "SSL: No data to be sent out");
734 212 : wpabuf_free(data->tls_out);
735 212 : data->tls_out = NULL;
736 212 : return 1;
737 : }
738 :
739 : /* Send the pending message (in fragments, if needed). */
740 586 : return eap_tls_process_output(data, eap_type, peap_version, id, ret,
741 : out_data);
742 : }
743 :
744 :
745 : /**
746 : * eap_peer_tls_build_ack - Build a TLS ACK frame
747 : * @id: EAP identifier for the response
748 : * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
749 : * @peap_version: Version number for EAP-PEAP/TTLS
750 : * Returns: Pointer to the allocated ACK frame or %NULL on failure
751 : */
752 386 : struct wpabuf * eap_peer_tls_build_ack(u8 id, EapType eap_type,
753 : int peap_version)
754 : {
755 : struct wpabuf *resp;
756 :
757 386 : resp = eap_tls_msg_alloc(eap_type, 1, EAP_CODE_RESPONSE, id);
758 386 : if (resp == NULL)
759 0 : return NULL;
760 386 : wpa_printf(MSG_DEBUG, "SSL: Building ACK (type=%d id=%d ver=%d)",
761 : (int) eap_type, id, peap_version);
762 386 : wpabuf_put_u8(resp, peap_version); /* Flags */
763 386 : return resp;
764 : }
765 :
766 :
767 : /**
768 : * eap_peer_tls_reauth_init - Re-initialize shared TLS for session resumption
769 : * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
770 : * @data: Data for TLS processing
771 : * Returns: 0 on success, -1 on failure
772 : */
773 19 : int eap_peer_tls_reauth_init(struct eap_sm *sm, struct eap_ssl_data *data)
774 : {
775 19 : eap_peer_tls_reset_input(data);
776 19 : eap_peer_tls_reset_output(data);
777 19 : return tls_connection_shutdown(data->ssl_ctx, data->conn);
778 : }
779 :
780 :
781 : /**
782 : * eap_peer_tls_status - Get TLS status
783 : * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
784 : * @data: Data for TLS processing
785 : * @buf: Buffer for status information
786 : * @buflen: Maximum buffer length
787 : * @verbose: Whether to include verbose status information
788 : * Returns: Number of bytes written to buf.
789 : */
790 133 : int eap_peer_tls_status(struct eap_sm *sm, struct eap_ssl_data *data,
791 : char *buf, size_t buflen, int verbose)
792 : {
793 : char name[128];
794 133 : int len = 0, ret;
795 :
796 133 : if (tls_get_cipher(data->ssl_ctx, data->conn, name, sizeof(name)) == 0)
797 : {
798 133 : ret = os_snprintf(buf + len, buflen - len,
799 : "EAP TLS cipher=%s\n"
800 : "tls_session_reused=%d\n",
801 : name, tls_connection_resumed(data->ssl_ctx,
802 : data->conn));
803 133 : if (os_snprintf_error(buflen - len, ret))
804 0 : return len;
805 133 : len += ret;
806 : }
807 :
808 133 : return len;
809 : }
810 :
811 :
812 : /**
813 : * eap_peer_tls_process_init - Initial validation/processing of EAP requests
814 : * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
815 : * @data: Data for TLS processing
816 : * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
817 : * @ret: Return values from EAP request validation and processing
818 : * @reqData: EAP request to be processed (eapReqData)
819 : * @len: Buffer for returning length of the remaining payload
820 : * @flags: Buffer for returning TLS flags
821 : * Returns: Pointer to payload after TLS flags and length or %NULL on failure
822 : *
823 : * This function validates the EAP header and processes the optional TLS
824 : * Message Length field. If this is the first fragment of a TLS message, the
825 : * TLS reassembly code is initialized to receive the indicated number of bytes.
826 : *
827 : * EAP-TLS, EAP-PEAP, EAP-TTLS, and EAP-FAST methods are expected to use this
828 : * function as the first step in processing received messages. They will need
829 : * to process the flags (apart from Message Length Included) that are returned
830 : * through the flags pointer and the message payload that will be returned (and
831 : * the length is returned through the len pointer). Return values (ret) are set
832 : * for continuation of EAP method processing. The caller is responsible for
833 : * setting these to indicate completion (either success or failure) based on
834 : * the authentication result.
835 : */
836 1419 : const u8 * eap_peer_tls_process_init(struct eap_sm *sm,
837 : struct eap_ssl_data *data,
838 : EapType eap_type,
839 : struct eap_method_ret *ret,
840 : const struct wpabuf *reqData,
841 : size_t *len, u8 *flags)
842 : {
843 : const u8 *pos;
844 : size_t left;
845 : unsigned int tls_msg_len;
846 :
847 1419 : if (tls_get_errors(data->ssl_ctx)) {
848 0 : wpa_printf(MSG_INFO, "SSL: TLS errors detected");
849 0 : ret->ignore = TRUE;
850 0 : return NULL;
851 : }
852 :
853 1419 : if (eap_type == EAP_UNAUTH_TLS_TYPE)
854 8 : pos = eap_hdr_validate(EAP_VENDOR_UNAUTH_TLS,
855 : EAP_VENDOR_TYPE_UNAUTH_TLS, reqData,
856 : &left);
857 1411 : else if (eap_type == EAP_WFA_UNAUTH_TLS_TYPE)
858 8 : pos = eap_hdr_validate(EAP_VENDOR_WFA_NEW,
859 : EAP_VENDOR_WFA_UNAUTH_TLS, reqData,
860 : &left);
861 : else
862 1403 : pos = eap_hdr_validate(EAP_VENDOR_IETF, eap_type, reqData,
863 : &left);
864 1419 : if (pos == NULL) {
865 0 : ret->ignore = TRUE;
866 0 : return NULL;
867 : }
868 1419 : if (left == 0) {
869 0 : wpa_printf(MSG_DEBUG, "SSL: Invalid TLS message: no Flags "
870 : "octet included");
871 0 : if (!sm->workaround) {
872 0 : ret->ignore = TRUE;
873 0 : return NULL;
874 : }
875 :
876 0 : wpa_printf(MSG_DEBUG, "SSL: Workaround - assume no Flags "
877 : "indicates ACK frame");
878 0 : *flags = 0;
879 : } else {
880 1419 : *flags = *pos++;
881 1419 : left--;
882 : }
883 1419 : wpa_printf(MSG_DEBUG, "SSL: Received packet(len=%lu) - "
884 : "Flags 0x%02x", (unsigned long) wpabuf_len(reqData),
885 1419 : *flags);
886 1419 : if (*flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) {
887 216 : if (left < 4) {
888 0 : wpa_printf(MSG_INFO, "SSL: Short frame with TLS "
889 : "length");
890 0 : ret->ignore = TRUE;
891 0 : return NULL;
892 : }
893 216 : tls_msg_len = WPA_GET_BE32(pos);
894 216 : wpa_printf(MSG_DEBUG, "SSL: TLS Message Length: %d",
895 : tls_msg_len);
896 216 : if (data->tls_in_left == 0) {
897 216 : data->tls_in_total = tls_msg_len;
898 216 : data->tls_in_left = tls_msg_len;
899 216 : wpabuf_free(data->tls_in);
900 216 : data->tls_in = NULL;
901 : }
902 216 : pos += 4;
903 216 : left -= 4;
904 :
905 216 : if (left > tls_msg_len) {
906 0 : wpa_printf(MSG_INFO, "SSL: TLS Message Length (%d "
907 : "bytes) smaller than this fragment (%d "
908 : "bytes)", (int) tls_msg_len, (int) left);
909 0 : ret->ignore = TRUE;
910 0 : return NULL;
911 : }
912 : }
913 :
914 1419 : ret->ignore = FALSE;
915 1419 : ret->methodState = METHOD_MAY_CONT;
916 1419 : ret->decision = DECISION_FAIL;
917 1419 : ret->allowNotifications = TRUE;
918 :
919 1419 : *len = left;
920 1419 : return pos;
921 : }
922 :
923 :
924 : /**
925 : * eap_peer_tls_reset_input - Reset input buffers
926 : * @data: Data for TLS processing
927 : *
928 : * This function frees any allocated memory for input buffers and resets input
929 : * state.
930 : */
931 1400 : void eap_peer_tls_reset_input(struct eap_ssl_data *data)
932 : {
933 1400 : data->tls_in_left = data->tls_in_total = 0;
934 1400 : wpabuf_free(data->tls_in);
935 1400 : data->tls_in = NULL;
936 1400 : }
937 :
938 :
939 : /**
940 : * eap_peer_tls_reset_output - Reset output buffers
941 : * @data: Data for TLS processing
942 : *
943 : * This function frees any allocated memory for output buffers and resets
944 : * output state.
945 : */
946 1650 : void eap_peer_tls_reset_output(struct eap_ssl_data *data)
947 : {
948 1650 : data->tls_out_pos = 0;
949 1650 : wpabuf_free(data->tls_out);
950 1650 : data->tls_out = NULL;
951 1650 : }
952 :
953 :
954 : /**
955 : * eap_peer_tls_decrypt - Decrypt received phase 2 TLS message
956 : * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
957 : * @data: Data for TLS processing
958 : * @in_data: Message received from the server
959 : * @in_decrypted: Buffer for returning a pointer to the decrypted message
960 : * Returns: 0 on success, 1 if more input data is needed, or -1 on failure
961 : */
962 371 : int eap_peer_tls_decrypt(struct eap_sm *sm, struct eap_ssl_data *data,
963 : const struct wpabuf *in_data,
964 : struct wpabuf **in_decrypted)
965 : {
966 : const struct wpabuf *msg;
967 : int need_more_input;
968 :
969 371 : msg = eap_peer_tls_data_reassemble(data, in_data, &need_more_input);
970 371 : if (msg == NULL)
971 0 : return need_more_input ? 1 : -1;
972 :
973 371 : *in_decrypted = tls_connection_decrypt(data->ssl_ctx, data->conn, msg);
974 371 : eap_peer_tls_reset_input(data);
975 371 : if (*in_decrypted == NULL) {
976 0 : wpa_printf(MSG_INFO, "SSL: Failed to decrypt Phase 2 data");
977 0 : return -1;
978 : }
979 371 : return 0;
980 : }
981 :
982 :
983 : /**
984 : * eap_peer_tls_encrypt - Encrypt phase 2 TLS message
985 : * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
986 : * @data: Data for TLS processing
987 : * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
988 : * @peap_version: Version number for EAP-PEAP/TTLS
989 : * @id: EAP identifier for the response
990 : * @in_data: Plaintext phase 2 data to encrypt or %NULL to continue fragments
991 : * @out_data: Buffer for returning a pointer to the encrypted response message
992 : * Returns: 0 on success, -1 on failure
993 : */
994 438 : int eap_peer_tls_encrypt(struct eap_sm *sm, struct eap_ssl_data *data,
995 : EapType eap_type, int peap_version, u8 id,
996 : const struct wpabuf *in_data,
997 : struct wpabuf **out_data)
998 : {
999 438 : if (in_data) {
1000 432 : eap_peer_tls_reset_output(data);
1001 432 : data->tls_out = tls_connection_encrypt(data->ssl_ctx,
1002 : data->conn, in_data);
1003 432 : if (data->tls_out == NULL) {
1004 0 : wpa_printf(MSG_INFO, "SSL: Failed to encrypt Phase 2 "
1005 : "data (in_len=%lu)",
1006 : (unsigned long) wpabuf_len(in_data));
1007 0 : eap_peer_tls_reset_output(data);
1008 0 : return -1;
1009 : }
1010 : }
1011 :
1012 438 : return eap_tls_process_output(data, eap_type, peap_version, id, 0,
1013 : out_data);
1014 : }
1015 :
1016 :
1017 : /**
1018 : * eap_peer_select_phase2_methods - Select phase 2 EAP method
1019 : * @config: Pointer to the network configuration
1020 : * @prefix: 'phase2' configuration prefix, e.g., "auth="
1021 : * @types: Buffer for returning allocated list of allowed EAP methods
1022 : * @num_types: Buffer for returning number of allocated EAP methods
1023 : * Returns: 0 on success, -1 on failure
1024 : *
1025 : * This function is used to parse EAP method list and select allowed methods
1026 : * for Phase2 authentication.
1027 : */
1028 82 : int eap_peer_select_phase2_methods(struct eap_peer_config *config,
1029 : const char *prefix,
1030 : struct eap_method_type **types,
1031 : size_t *num_types)
1032 : {
1033 : char *start, *pos, *buf;
1034 82 : struct eap_method_type *methods = NULL, *_methods;
1035 : u8 method;
1036 82 : size_t num_methods = 0, prefix_len;
1037 :
1038 82 : if (config == NULL || config->phase2 == NULL)
1039 : goto get_defaults;
1040 :
1041 73 : start = buf = os_strdup(config->phase2);
1042 73 : if (buf == NULL)
1043 0 : return -1;
1044 :
1045 73 : prefix_len = os_strlen(prefix);
1046 :
1047 219 : while (start && *start != '\0') {
1048 : int vendor;
1049 73 : pos = os_strstr(start, prefix);
1050 73 : if (pos == NULL)
1051 0 : break;
1052 73 : if (start != pos && *(pos - 1) != ' ') {
1053 0 : start = pos + prefix_len;
1054 0 : continue;
1055 : }
1056 :
1057 73 : start = pos + prefix_len;
1058 73 : pos = os_strchr(start, ' ');
1059 73 : if (pos)
1060 0 : *pos++ = '\0';
1061 73 : method = eap_get_phase2_type(start, &vendor);
1062 73 : if (vendor == EAP_VENDOR_IETF && method == EAP_TYPE_NONE) {
1063 0 : wpa_printf(MSG_ERROR, "TLS: Unsupported Phase2 EAP "
1064 : "method '%s'", start);
1065 : } else {
1066 73 : num_methods++;
1067 73 : _methods = os_realloc_array(methods, num_methods,
1068 : sizeof(*methods));
1069 73 : if (_methods == NULL) {
1070 0 : os_free(methods);
1071 0 : os_free(buf);
1072 0 : return -1;
1073 : }
1074 73 : methods = _methods;
1075 73 : methods[num_methods - 1].vendor = vendor;
1076 73 : methods[num_methods - 1].method = method;
1077 : }
1078 :
1079 73 : start = pos;
1080 : }
1081 :
1082 73 : os_free(buf);
1083 :
1084 : get_defaults:
1085 82 : if (methods == NULL)
1086 9 : methods = eap_get_phase2_types(config, &num_methods);
1087 :
1088 82 : if (methods == NULL) {
1089 0 : wpa_printf(MSG_ERROR, "TLS: No Phase2 EAP methods available");
1090 0 : return -1;
1091 : }
1092 82 : wpa_hexdump(MSG_DEBUG, "TLS: Phase2 EAP types",
1093 : (u8 *) methods,
1094 : num_methods * sizeof(struct eap_method_type));
1095 :
1096 82 : *types = methods;
1097 82 : *num_types = num_methods;
1098 :
1099 82 : return 0;
1100 : }
1101 :
1102 :
1103 : /**
1104 : * eap_peer_tls_phase2_nak - Generate EAP-Nak for Phase 2
1105 : * @types: Buffer for returning allocated list of allowed EAP methods
1106 : * @num_types: Buffer for returning number of allocated EAP methods
1107 : * @hdr: EAP-Request header (and the following EAP type octet)
1108 : * @resp: Buffer for returning the EAP-Nak message
1109 : * Returns: 0 on success, -1 on failure
1110 : */
1111 21 : int eap_peer_tls_phase2_nak(struct eap_method_type *types, size_t num_types,
1112 : struct eap_hdr *hdr, struct wpabuf **resp)
1113 : {
1114 21 : u8 *pos = (u8 *) (hdr + 1);
1115 : size_t i;
1116 :
1117 : /* TODO: add support for expanded Nak */
1118 21 : wpa_printf(MSG_DEBUG, "TLS: Phase 2 Request: Nak type=%d", *pos);
1119 21 : wpa_hexdump(MSG_DEBUG, "TLS: Allowed Phase2 EAP types",
1120 : (u8 *) types, num_types * sizeof(struct eap_method_type));
1121 21 : *resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_NAK, num_types,
1122 21 : EAP_CODE_RESPONSE, hdr->identifier);
1123 21 : if (*resp == NULL)
1124 0 : return -1;
1125 :
1126 42 : for (i = 0; i < num_types; i++) {
1127 42 : if (types[i].vendor == EAP_VENDOR_IETF &&
1128 21 : types[i].method < 256)
1129 21 : wpabuf_put_u8(*resp, types[i].method);
1130 : }
1131 :
1132 21 : eap_update_len(*resp);
1133 :
1134 21 : return 0;
1135 : }
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