2 * EAP peer: EAP-TLS/PEAP/TTLS/FAST common functions
3 * Copyright (c) 2004-2013, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
12 #include "crypto/sha1.h"
13 #include "crypto/tls.h"
15 #include "eap_tls_common.h"
16 #include "eap_config.h"
19 static struct wpabuf * eap_tls_msg_alloc(EapType type, size_t payload_len,
20 u8 code, u8 identifier)
22 if (type == EAP_UNAUTH_TLS_TYPE)
23 return eap_msg_alloc(EAP_VENDOR_UNAUTH_TLS,
24 EAP_VENDOR_TYPE_UNAUTH_TLS, payload_len,
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,
30 return eap_msg_alloc(EAP_VENDOR_IETF, type, payload_len, code,
35 static int eap_tls_check_blob(struct eap_sm *sm, const char **name,
36 const u8 **data, size_t *data_len)
38 const struct wpa_config_blob *blob;
40 if (*name == NULL || os_strncmp(*name, "blob://", 7) != 0)
43 blob = eap_get_config_blob(sm, *name + 7);
45 wpa_printf(MSG_ERROR, "%s: Named configuration blob '%s' not "
46 "found", __func__, *name + 7);
52 *data_len = blob->len;
58 static void eap_tls_params_flags(struct tls_connection_params *params,
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_1=1"))
72 params->flags |= TLS_CONN_DISABLE_TLSv1_1;
73 if (os_strstr(txt, "tls_disable_tlsv1_1=0"))
74 params->flags &= ~TLS_CONN_DISABLE_TLSv1_1;
75 if (os_strstr(txt, "tls_disable_tlsv1_2=1"))
76 params->flags |= TLS_CONN_DISABLE_TLSv1_2;
77 if (os_strstr(txt, "tls_disable_tlsv1_2=0"))
78 params->flags &= ~TLS_CONN_DISABLE_TLSv1_2;
82 static void eap_tls_params_from_conf1(struct tls_connection_params *params,
83 struct eap_peer_config *config)
85 params->ca_cert = (char *) config->ca_cert;
86 params->ca_path = (char *) config->ca_path;
87 params->client_cert = (char *) config->client_cert;
88 params->private_key = (char *) config->private_key;
89 params->private_key_passwd = (char *) config->private_key_passwd;
90 params->dh_file = (char *) config->dh_file;
91 params->subject_match = (char *) config->subject_match;
92 params->altsubject_match = (char *) config->altsubject_match;
93 params->suffix_match = config->domain_suffix_match;
94 params->engine = config->engine;
95 params->engine_id = config->engine_id;
96 params->pin = config->pin;
97 params->key_id = config->key_id;
98 params->cert_id = config->cert_id;
99 params->ca_cert_id = config->ca_cert_id;
100 eap_tls_params_flags(params, config->phase1);
104 static void eap_tls_params_from_conf2(struct tls_connection_params *params,
105 struct eap_peer_config *config)
107 params->ca_cert = (char *) config->ca_cert2;
108 params->ca_path = (char *) config->ca_path2;
109 params->client_cert = (char *) config->client_cert2;
110 params->private_key = (char *) config->private_key2;
111 params->private_key_passwd = (char *) config->private_key2_passwd;
112 params->dh_file = (char *) config->dh_file2;
113 params->subject_match = (char *) config->subject_match2;
114 params->altsubject_match = (char *) config->altsubject_match2;
115 params->suffix_match = config->domain_suffix_match2;
116 params->engine = config->engine2;
117 params->engine_id = config->engine2_id;
118 params->pin = config->pin2;
119 params->key_id = config->key2_id;
120 params->cert_id = config->cert2_id;
121 params->ca_cert_id = config->ca_cert2_id;
122 eap_tls_params_flags(params, config->phase2);
126 static int eap_tls_params_from_conf(struct eap_sm *sm,
127 struct eap_ssl_data *data,
128 struct tls_connection_params *params,
129 struct eap_peer_config *config, int phase2)
131 os_memset(params, 0, sizeof(*params));
132 if (sm->workaround && data->eap_type != EAP_TYPE_FAST) {
134 * Some deployed authentication servers seem to be unable to
135 * handle the TLS Session Ticket extension (they are supposed
136 * to ignore unrecognized TLS extensions, but end up rejecting
137 * the ClientHello instead). As a workaround, disable use of
138 * TLS Sesson Ticket extension for EAP-TLS, EAP-PEAP, and
139 * EAP-TTLS (EAP-FAST uses session ticket, so any server that
140 * supports EAP-FAST does not need this workaround).
142 params->flags |= TLS_CONN_DISABLE_SESSION_TICKET;
145 wpa_printf(MSG_DEBUG, "TLS: using phase2 config options");
146 eap_tls_params_from_conf2(params, config);
148 wpa_printf(MSG_DEBUG, "TLS: using phase1 config options");
149 eap_tls_params_from_conf1(params, config);
153 * Use blob data, if available. Otherwise, leave reference to external
156 if (eap_tls_check_blob(sm, ¶ms->ca_cert, ¶ms->ca_cert_blob,
157 ¶ms->ca_cert_blob_len) ||
158 eap_tls_check_blob(sm, ¶ms->client_cert,
159 ¶ms->client_cert_blob,
160 ¶ms->client_cert_blob_len) ||
161 eap_tls_check_blob(sm, ¶ms->private_key,
162 ¶ms->private_key_blob,
163 ¶ms->private_key_blob_len) ||
164 eap_tls_check_blob(sm, ¶ms->dh_file, ¶ms->dh_blob,
165 ¶ms->dh_blob_len)) {
166 wpa_printf(MSG_INFO, "SSL: Failed to get configuration blobs");
170 params->openssl_ciphers = config->openssl_ciphers;
176 static int eap_tls_init_connection(struct eap_sm *sm,
177 struct eap_ssl_data *data,
178 struct eap_peer_config *config,
179 struct tls_connection_params *params)
184 params->flags |= TLS_CONN_REQUEST_OCSP;
185 if (config->ocsp == 2)
186 params->flags |= TLS_CONN_REQUIRE_OCSP;
187 data->conn = tls_connection_init(data->ssl_ctx);
188 if (data->conn == NULL) {
189 wpa_printf(MSG_INFO, "SSL: Failed to initialize new TLS "
194 res = tls_connection_set_params(data->ssl_ctx, data->conn, params);
195 if (res == TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED) {
197 * At this point with the pkcs11 engine the PIN might be wrong.
198 * We reset the PIN in the configuration to be sure to not use
199 * it again and the calling function must request a new one.
201 os_free(config->pin);
203 } else if (res == TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED) {
204 wpa_printf(MSG_INFO, "TLS: Failed to load private key");
206 * We do not know exactly but maybe the PIN was wrong,
207 * so ask for a new one.
209 os_free(config->pin);
211 eap_sm_request_pin(sm);
213 tls_connection_deinit(data->ssl_ctx, data->conn);
217 wpa_printf(MSG_INFO, "TLS: Failed to set TLS connection "
219 tls_connection_deinit(data->ssl_ctx, data->conn);
229 * eap_peer_tls_ssl_init - Initialize shared TLS functionality
230 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
231 * @data: Data for TLS processing
232 * @config: Pointer to the network configuration
233 * @eap_type: EAP method used in Phase 1 (EAP_TYPE_TLS/PEAP/TTLS/FAST)
234 * Returns: 0 on success, -1 on failure
236 * This function is used to initialize shared TLS functionality for EAP-TLS,
237 * EAP-PEAP, EAP-TTLS, and EAP-FAST.
239 int eap_peer_tls_ssl_init(struct eap_sm *sm, struct eap_ssl_data *data,
240 struct eap_peer_config *config, u8 eap_type)
242 struct tls_connection_params params;
248 data->eap_type = eap_type;
249 data->phase2 = sm->init_phase2;
250 data->ssl_ctx = sm->init_phase2 && sm->ssl_ctx2 ? sm->ssl_ctx2 :
252 if (eap_tls_params_from_conf(sm, data, ¶ms, config, data->phase2) <
256 if (eap_tls_init_connection(sm, data, config, ¶ms) < 0)
259 data->tls_out_limit = config->fragment_size;
261 /* Limit the fragment size in the inner TLS authentication
262 * since the outer authentication with EAP-PEAP does not yet
263 * support fragmentation */
264 if (data->tls_out_limit > 100)
265 data->tls_out_limit -= 100;
268 if (config->phase1 &&
269 os_strstr(config->phase1, "include_tls_length=1")) {
270 wpa_printf(MSG_DEBUG, "TLS: Include TLS Message Length in "
271 "unfragmented packets");
272 data->include_tls_length = 1;
280 * eap_peer_tls_ssl_deinit - Deinitialize shared TLS functionality
281 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
282 * @data: Data for TLS processing
284 * This function deinitializes shared TLS functionality that was initialized
285 * with eap_peer_tls_ssl_init().
287 void eap_peer_tls_ssl_deinit(struct eap_sm *sm, struct eap_ssl_data *data)
289 tls_connection_deinit(data->ssl_ctx, data->conn);
290 eap_peer_tls_reset_input(data);
291 eap_peer_tls_reset_output(data);
296 * eap_peer_tls_derive_key - Derive a key based on TLS session data
297 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
298 * @data: Data for TLS processing
299 * @label: Label string for deriving the keys, e.g., "client EAP encryption"
300 * @len: Length of the key material to generate (usually 64 for MSK)
301 * Returns: Pointer to allocated key on success or %NULL on failure
303 * This function uses TLS-PRF to generate pseudo-random data based on the TLS
304 * session data (client/server random and master key). Each key type may use a
305 * different label to bind the key usage into the generated material.
307 * The caller is responsible for freeing the returned buffer.
309 u8 * eap_peer_tls_derive_key(struct eap_sm *sm, struct eap_ssl_data *data,
310 const char *label, size_t len)
313 struct tls_keys keys;
314 #endif /* CONFIG_FIPS */
315 u8 *rnd = NULL, *out;
317 out = os_malloc(len);
321 /* First, try to use TLS library function for PRF, if available. */
322 if (tls_connection_prf(data->ssl_ctx, data->conn, label, 0, out, len)
328 * TLS library did not support key generation, so get the needed TLS
329 * session parameters and use an internal implementation of TLS PRF to
332 if (tls_connection_get_keys(data->ssl_ctx, data->conn, &keys))
335 if (keys.client_random == NULL || keys.server_random == NULL ||
336 keys.master_key == NULL)
339 rnd = os_malloc(keys.client_random_len + keys.server_random_len);
342 os_memcpy(rnd, keys.client_random, keys.client_random_len);
343 os_memcpy(rnd + keys.client_random_len, keys.server_random,
344 keys.server_random_len);
346 if (tls_prf_sha1_md5(keys.master_key, keys.master_key_len,
347 label, rnd, keys.client_random_len +
348 keys.server_random_len, out, len))
355 #endif /* CONFIG_FIPS */
363 * eap_peer_tls_derive_session_id - Derive a Session-Id based on TLS data
364 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
365 * @data: Data for TLS processing
366 * @eap_type: EAP method used in Phase 1 (EAP_TYPE_TLS/PEAP/TTLS/FAST)
367 * @len: Pointer to length of the session ID generated
368 * Returns: Pointer to allocated Session-Id on success or %NULL on failure
370 * This function derive the Session-Id based on the TLS session data
371 * (client/server random and method type).
373 * The caller is responsible for freeing the returned buffer.
375 u8 * eap_peer_tls_derive_session_id(struct eap_sm *sm,
376 struct eap_ssl_data *data, u8 eap_type,
379 struct tls_keys keys;
382 if (tls_connection_get_keys(sm->ssl_ctx, data->conn, &keys))
385 if (keys.client_random == NULL || keys.server_random == NULL)
388 *len = 1 + keys.client_random_len + keys.server_random_len;
389 out = os_malloc(*len);
393 /* Session-Id = EAP type || client.random || server.random */
395 os_memcpy(out + 1, keys.client_random, keys.client_random_len);
396 os_memcpy(out + 1 + keys.client_random_len, keys.server_random,
397 keys.server_random_len);
404 * eap_peer_tls_reassemble_fragment - Reassemble a received fragment
405 * @data: Data for TLS processing
406 * @in_data: Next incoming TLS segment
407 * Returns: 0 on success, 1 if more data is needed for the full message, or
410 static int eap_peer_tls_reassemble_fragment(struct eap_ssl_data *data,
411 const struct wpabuf *in_data)
413 size_t tls_in_len, in_len;
415 tls_in_len = data->tls_in ? wpabuf_len(data->tls_in) : 0;
416 in_len = in_data ? wpabuf_len(in_data) : 0;
418 if (tls_in_len + in_len == 0) {
419 /* No message data received?! */
420 wpa_printf(MSG_WARNING, "SSL: Invalid reassembly state: "
421 "tls_in_left=%lu tls_in_len=%lu in_len=%lu",
422 (unsigned long) data->tls_in_left,
423 (unsigned long) tls_in_len,
424 (unsigned long) in_len);
425 eap_peer_tls_reset_input(data);
429 if (tls_in_len + in_len > 65536) {
431 * Limit length to avoid rogue servers from causing large
432 * memory allocations.
434 wpa_printf(MSG_INFO, "SSL: Too long TLS fragment (size over "
436 eap_peer_tls_reset_input(data);
440 if (in_len > data->tls_in_left) {
441 /* Sender is doing something odd - reject message */
442 wpa_printf(MSG_INFO, "SSL: more data than TLS message length "
444 eap_peer_tls_reset_input(data);
448 if (wpabuf_resize(&data->tls_in, in_len) < 0) {
449 wpa_printf(MSG_INFO, "SSL: Could not allocate memory for TLS "
451 eap_peer_tls_reset_input(data);
455 wpabuf_put_buf(data->tls_in, in_data);
456 data->tls_in_left -= in_len;
458 if (data->tls_in_left > 0) {
459 wpa_printf(MSG_DEBUG, "SSL: Need %lu bytes more input "
460 "data", (unsigned long) data->tls_in_left);
469 * eap_peer_tls_data_reassemble - Reassemble TLS data
470 * @data: Data for TLS processing
471 * @in_data: Next incoming TLS segment
472 * @need_more_input: Variable for returning whether more input data is needed
473 * to reassemble this TLS packet
474 * Returns: Pointer to output data, %NULL on error or when more data is needed
475 * for the full message (in which case, *need_more_input is also set to 1).
477 * This function reassembles TLS fragments. Caller must not free the returned
478 * data buffer since an internal pointer to it is maintained.
480 static const struct wpabuf * eap_peer_tls_data_reassemble(
481 struct eap_ssl_data *data, const struct wpabuf *in_data,
482 int *need_more_input)
484 *need_more_input = 0;
486 if (data->tls_in_left > wpabuf_len(in_data) || data->tls_in) {
487 /* Message has fragments */
488 int res = eap_peer_tls_reassemble_fragment(data, in_data);
491 *need_more_input = 1;
495 /* Message is now fully reassembled. */
497 /* No fragments in this message, so just make a copy of it. */
498 data->tls_in_left = 0;
499 data->tls_in = wpabuf_dup(in_data);
500 if (data->tls_in == NULL)
509 * eap_tls_process_input - Process incoming TLS message
510 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
511 * @data: Data for TLS processing
512 * @in_data: Message received from the server
513 * @in_len: Length of in_data
514 * @out_data: Buffer for returning a pointer to application data (if available)
515 * Returns: 0 on success, 1 if more input data is needed, 2 if application data
516 * is available, -1 on failure
518 static int eap_tls_process_input(struct eap_sm *sm, struct eap_ssl_data *data,
519 const u8 *in_data, size_t in_len,
520 struct wpabuf **out_data)
522 const struct wpabuf *msg;
524 struct wpabuf *appl_data;
527 wpabuf_set(&buf, in_data, in_len);
528 msg = eap_peer_tls_data_reassemble(data, &buf, &need_more_input);
530 return need_more_input ? 1 : -1;
532 /* Full TLS message reassembled - continue handshake processing */
534 /* This should not happen.. */
535 wpa_printf(MSG_INFO, "SSL: eap_tls_process_input - pending "
536 "tls_out data even though tls_out_len = 0");
537 wpabuf_free(data->tls_out);
538 WPA_ASSERT(data->tls_out == NULL);
541 data->tls_out = tls_connection_handshake(data->ssl_ctx, data->conn,
544 eap_peer_tls_reset_input(data);
547 tls_connection_established(data->ssl_ctx, data->conn) &&
548 !tls_connection_get_failed(data->ssl_ctx, data->conn)) {
549 wpa_hexdump_buf_key(MSG_MSGDUMP, "SSL: Application data",
551 *out_data = appl_data;
555 wpabuf_free(appl_data);
562 * eap_tls_process_output - Process outgoing TLS message
563 * @data: Data for TLS processing
564 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
565 * @peap_version: Version number for EAP-PEAP/TTLS
566 * @id: EAP identifier for the response
567 * @ret: Return value to use on success
568 * @out_data: Buffer for returning the allocated output buffer
569 * Returns: ret (0 or 1) on success, -1 on failure
571 static int eap_tls_process_output(struct eap_ssl_data *data, EapType eap_type,
572 int peap_version, u8 id, int ret,
573 struct wpabuf **out_data)
577 int more_fragments, length_included;
579 if (data->tls_out == NULL)
581 len = wpabuf_len(data->tls_out) - data->tls_out_pos;
582 wpa_printf(MSG_DEBUG, "SSL: %lu bytes left to be sent out (of total "
585 (unsigned long) wpabuf_len(data->tls_out));
588 * Limit outgoing message to the configured maximum size. Fragment
591 if (len > data->tls_out_limit) {
593 len = data->tls_out_limit;
594 wpa_printf(MSG_DEBUG, "SSL: sending %lu bytes, more fragments "
595 "will follow", (unsigned long) len);
599 length_included = data->tls_out_pos == 0 &&
600 (wpabuf_len(data->tls_out) > data->tls_out_limit ||
601 data->include_tls_length);
602 if (!length_included &&
603 eap_type == EAP_TYPE_PEAP && peap_version == 0 &&
604 !tls_connection_established(data->eap->ssl_ctx, data->conn)) {
606 * Windows Server 2008 NPS really wants to have the TLS Message
607 * length included in phase 0 even for unfragmented frames or
608 * it will get very confused with Compound MAC calculation and
614 *out_data = eap_tls_msg_alloc(eap_type, 1 + length_included * 4 + len,
615 EAP_CODE_RESPONSE, id);
616 if (*out_data == NULL)
619 flags = wpabuf_put(*out_data, 1);
620 *flags = peap_version;
622 *flags |= EAP_TLS_FLAGS_MORE_FRAGMENTS;
623 if (length_included) {
624 *flags |= EAP_TLS_FLAGS_LENGTH_INCLUDED;
625 wpabuf_put_be32(*out_data, wpabuf_len(data->tls_out));
628 wpabuf_put_data(*out_data,
629 wpabuf_head_u8(data->tls_out) + data->tls_out_pos,
631 data->tls_out_pos += len;
634 eap_peer_tls_reset_output(data);
641 * eap_peer_tls_process_helper - Process TLS handshake message
642 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
643 * @data: Data for TLS processing
644 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
645 * @peap_version: Version number for EAP-PEAP/TTLS
646 * @id: EAP identifier for the response
647 * @in_data: Message received from the server
648 * @in_len: Length of in_data
649 * @out_data: Buffer for returning a pointer to the response message
650 * Returns: 0 on success, 1 if more input data is needed, 2 if application data
651 * is available, or -1 on failure
653 * This function can be used to process TLS handshake messages. It reassembles
654 * the received fragments and uses a TLS library to process the messages. The
655 * response data from the TLS library is fragmented to suitable output messages
656 * that the caller can send out.
658 * out_data is used to return the response message if the return value of this
659 * function is 0, 2, or -1. In case of failure, the message is likely a TLS
660 * alarm message. The caller is responsible for freeing the allocated buffer if
661 * *out_data is not %NULL.
663 * This function is called for each received TLS message during the TLS
664 * handshake after eap_peer_tls_process_init() call and possible processing of
665 * TLS Flags field. Once the handshake has been completed, i.e., when
666 * tls_connection_established() returns 1, EAP method specific decrypting of
667 * the tunneled data is used.
669 int eap_peer_tls_process_helper(struct eap_sm *sm, struct eap_ssl_data *data,
670 EapType eap_type, int peap_version,
671 u8 id, const u8 *in_data, size_t in_len,
672 struct wpabuf **out_data)
678 if (data->tls_out && wpabuf_len(data->tls_out) > 0 && in_len > 0) {
679 wpa_printf(MSG_DEBUG, "SSL: Received non-ACK when output "
680 "fragments are waiting to be sent out");
684 if (data->tls_out == NULL || wpabuf_len(data->tls_out) == 0) {
686 * No more data to send out - expect to receive more data from
689 int res = eap_tls_process_input(sm, data, in_data, in_len,
693 * Input processing failed (res = -1) or more data is
700 * The incoming message has been reassembled and processed. The
701 * response was allocated into data->tls_out buffer.
705 if (data->tls_out == NULL) {
707 * No outgoing fragments remaining from the previous message
708 * and no new message generated. This indicates an error in TLS
711 eap_peer_tls_reset_output(data);
715 if (tls_connection_get_failed(data->ssl_ctx, data->conn)) {
716 /* TLS processing has failed - return error */
717 wpa_printf(MSG_DEBUG, "SSL: Failed - tls_out available to "
720 /* TODO: clean pin if engine used? */
723 if (data->tls_out == NULL || wpabuf_len(data->tls_out) == 0) {
725 * TLS negotiation should now be complete since all other cases
726 * needing more data should have been caught above based on
727 * the TLS Message Length field.
729 wpa_printf(MSG_DEBUG, "SSL: No data to be sent out");
730 wpabuf_free(data->tls_out);
731 data->tls_out = NULL;
735 /* Send the pending message (in fragments, if needed). */
736 return eap_tls_process_output(data, eap_type, peap_version, id, ret,
742 * eap_peer_tls_build_ack - Build a TLS ACK frame
743 * @id: EAP identifier for the response
744 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
745 * @peap_version: Version number for EAP-PEAP/TTLS
746 * Returns: Pointer to the allocated ACK frame or %NULL on failure
748 struct wpabuf * eap_peer_tls_build_ack(u8 id, EapType eap_type,
753 resp = eap_tls_msg_alloc(eap_type, 1, EAP_CODE_RESPONSE, id);
756 wpa_printf(MSG_DEBUG, "SSL: Building ACK (type=%d id=%d ver=%d)",
757 (int) eap_type, id, peap_version);
758 wpabuf_put_u8(resp, peap_version); /* Flags */
764 * eap_peer_tls_reauth_init - Re-initialize shared TLS for session resumption
765 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
766 * @data: Data for TLS processing
767 * Returns: 0 on success, -1 on failure
769 int eap_peer_tls_reauth_init(struct eap_sm *sm, struct eap_ssl_data *data)
771 eap_peer_tls_reset_input(data);
772 eap_peer_tls_reset_output(data);
773 return tls_connection_shutdown(data->ssl_ctx, data->conn);
778 * eap_peer_tls_status - Get TLS status
779 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
780 * @data: Data for TLS processing
781 * @buf: Buffer for status information
782 * @buflen: Maximum buffer length
783 * @verbose: Whether to include verbose status information
784 * Returns: Number of bytes written to buf.
786 int eap_peer_tls_status(struct eap_sm *sm, struct eap_ssl_data *data,
787 char *buf, size_t buflen, int verbose)
792 if (tls_get_cipher(data->ssl_ctx, data->conn, name, sizeof(name)) == 0)
794 ret = os_snprintf(buf + len, buflen - len,
795 "EAP TLS cipher=%s\n", name);
796 if (ret < 0 || (size_t) ret >= buflen - len)
806 * eap_peer_tls_process_init - Initial validation/processing of EAP requests
807 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
808 * @data: Data for TLS processing
809 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
810 * @ret: Return values from EAP request validation and processing
811 * @reqData: EAP request to be processed (eapReqData)
812 * @len: Buffer for returning length of the remaining payload
813 * @flags: Buffer for returning TLS flags
814 * Returns: Pointer to payload after TLS flags and length or %NULL on failure
816 * This function validates the EAP header and processes the optional TLS
817 * Message Length field. If this is the first fragment of a TLS message, the
818 * TLS reassembly code is initialized to receive the indicated number of bytes.
820 * EAP-TLS, EAP-PEAP, EAP-TTLS, and EAP-FAST methods are expected to use this
821 * function as the first step in processing received messages. They will need
822 * to process the flags (apart from Message Length Included) that are returned
823 * through the flags pointer and the message payload that will be returned (and
824 * the length is returned through the len pointer). Return values (ret) are set
825 * for continuation of EAP method processing. The caller is responsible for
826 * setting these to indicate completion (either success or failure) based on
827 * the authentication result.
829 const u8 * eap_peer_tls_process_init(struct eap_sm *sm,
830 struct eap_ssl_data *data,
832 struct eap_method_ret *ret,
833 const struct wpabuf *reqData,
834 size_t *len, u8 *flags)
838 unsigned int tls_msg_len;
840 if (tls_get_errors(data->ssl_ctx)) {
841 wpa_printf(MSG_INFO, "SSL: TLS errors detected");
846 if (eap_type == EAP_UNAUTH_TLS_TYPE)
847 pos = eap_hdr_validate(EAP_VENDOR_UNAUTH_TLS,
848 EAP_VENDOR_TYPE_UNAUTH_TLS, reqData,
850 else if (eap_type == EAP_WFA_UNAUTH_TLS_TYPE)
851 pos = eap_hdr_validate(EAP_VENDOR_WFA_NEW,
852 EAP_VENDOR_WFA_UNAUTH_TLS, reqData,
855 pos = eap_hdr_validate(EAP_VENDOR_IETF, eap_type, reqData,
862 wpa_printf(MSG_DEBUG, "SSL: Invalid TLS message: no Flags "
864 if (!sm->workaround) {
869 wpa_printf(MSG_DEBUG, "SSL: Workaround - assume no Flags "
870 "indicates ACK frame");
876 wpa_printf(MSG_DEBUG, "SSL: Received packet(len=%lu) - "
877 "Flags 0x%02x", (unsigned long) wpabuf_len(reqData),
879 if (*flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) {
881 wpa_printf(MSG_INFO, "SSL: Short frame with TLS "
886 tls_msg_len = WPA_GET_BE32(pos);
887 wpa_printf(MSG_DEBUG, "SSL: TLS Message Length: %d",
889 if (data->tls_in_left == 0) {
890 data->tls_in_total = tls_msg_len;
891 data->tls_in_left = tls_msg_len;
892 wpabuf_free(data->tls_in);
898 if (left > tls_msg_len) {
899 wpa_printf(MSG_INFO, "SSL: TLS Message Length (%d "
900 "bytes) smaller than this fragment (%d "
901 "bytes)", (int) tls_msg_len, (int) left);
908 ret->methodState = METHOD_MAY_CONT;
909 ret->decision = DECISION_FAIL;
910 ret->allowNotifications = TRUE;
918 * eap_peer_tls_reset_input - Reset input buffers
919 * @data: Data for TLS processing
921 * This function frees any allocated memory for input buffers and resets input
924 void eap_peer_tls_reset_input(struct eap_ssl_data *data)
926 data->tls_in_left = data->tls_in_total = 0;
927 wpabuf_free(data->tls_in);
933 * eap_peer_tls_reset_output - Reset output buffers
934 * @data: Data for TLS processing
936 * This function frees any allocated memory for output buffers and resets
939 void eap_peer_tls_reset_output(struct eap_ssl_data *data)
941 data->tls_out_pos = 0;
942 wpabuf_free(data->tls_out);
943 data->tls_out = NULL;
948 * eap_peer_tls_decrypt - Decrypt received phase 2 TLS message
949 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
950 * @data: Data for TLS processing
951 * @in_data: Message received from the server
952 * @in_decrypted: Buffer for returning a pointer to the decrypted message
953 * Returns: 0 on success, 1 if more input data is needed, or -1 on failure
955 int eap_peer_tls_decrypt(struct eap_sm *sm, struct eap_ssl_data *data,
956 const struct wpabuf *in_data,
957 struct wpabuf **in_decrypted)
959 const struct wpabuf *msg;
962 msg = eap_peer_tls_data_reassemble(data, in_data, &need_more_input);
964 return need_more_input ? 1 : -1;
966 *in_decrypted = tls_connection_decrypt(data->ssl_ctx, data->conn, msg);
967 eap_peer_tls_reset_input(data);
968 if (*in_decrypted == NULL) {
969 wpa_printf(MSG_INFO, "SSL: Failed to decrypt Phase 2 data");
977 * eap_peer_tls_encrypt - Encrypt phase 2 TLS message
978 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
979 * @data: Data for TLS processing
980 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
981 * @peap_version: Version number for EAP-PEAP/TTLS
982 * @id: EAP identifier for the response
983 * @in_data: Plaintext phase 2 data to encrypt or %NULL to continue fragments
984 * @out_data: Buffer for returning a pointer to the encrypted response message
985 * Returns: 0 on success, -1 on failure
987 int eap_peer_tls_encrypt(struct eap_sm *sm, struct eap_ssl_data *data,
988 EapType eap_type, int peap_version, u8 id,
989 const struct wpabuf *in_data,
990 struct wpabuf **out_data)
993 eap_peer_tls_reset_output(data);
994 data->tls_out = tls_connection_encrypt(data->ssl_ctx,
995 data->conn, in_data);
996 if (data->tls_out == NULL) {
997 wpa_printf(MSG_INFO, "SSL: Failed to encrypt Phase 2 "
999 (unsigned long) wpabuf_len(in_data));
1000 eap_peer_tls_reset_output(data);
1005 return eap_tls_process_output(data, eap_type, peap_version, id, 0,
1011 * eap_peer_select_phase2_methods - Select phase 2 EAP method
1012 * @config: Pointer to the network configuration
1013 * @prefix: 'phase2' configuration prefix, e.g., "auth="
1014 * @types: Buffer for returning allocated list of allowed EAP methods
1015 * @num_types: Buffer for returning number of allocated EAP methods
1016 * Returns: 0 on success, -1 on failure
1018 * This function is used to parse EAP method list and select allowed methods
1019 * for Phase2 authentication.
1021 int eap_peer_select_phase2_methods(struct eap_peer_config *config,
1023 struct eap_method_type **types,
1026 char *start, *pos, *buf;
1027 struct eap_method_type *methods = NULL, *_methods;
1029 size_t num_methods = 0, prefix_len;
1031 if (config == NULL || config->phase2 == NULL)
1034 start = buf = os_strdup(config->phase2);
1038 prefix_len = os_strlen(prefix);
1040 while (start && *start != '\0') {
1042 pos = os_strstr(start, prefix);
1045 if (start != pos && *(pos - 1) != ' ') {
1046 start = pos + prefix_len;
1050 start = pos + prefix_len;
1051 pos = os_strchr(start, ' ');
1054 method = eap_get_phase2_type(start, &vendor);
1055 if (vendor == EAP_VENDOR_IETF && method == EAP_TYPE_NONE) {
1056 wpa_printf(MSG_ERROR, "TLS: Unsupported Phase2 EAP "
1057 "method '%s'", start);
1060 _methods = os_realloc_array(methods, num_methods,
1062 if (_methods == NULL) {
1068 methods[num_methods - 1].vendor = vendor;
1069 methods[num_methods - 1].method = method;
1078 if (methods == NULL)
1079 methods = eap_get_phase2_types(config, &num_methods);
1081 if (methods == NULL) {
1082 wpa_printf(MSG_ERROR, "TLS: No Phase2 EAP methods available");
1085 wpa_hexdump(MSG_DEBUG, "TLS: Phase2 EAP types",
1087 num_methods * sizeof(struct eap_method_type));
1090 *num_types = num_methods;
1097 * eap_peer_tls_phase2_nak - Generate EAP-Nak for Phase 2
1098 * @types: Buffer for returning allocated list of allowed EAP methods
1099 * @num_types: Buffer for returning number of allocated EAP methods
1100 * @hdr: EAP-Request header (and the following EAP type octet)
1101 * @resp: Buffer for returning the EAP-Nak message
1102 * Returns: 0 on success, -1 on failure
1104 int eap_peer_tls_phase2_nak(struct eap_method_type *types, size_t num_types,
1105 struct eap_hdr *hdr, struct wpabuf **resp)
1107 u8 *pos = (u8 *) (hdr + 1);
1110 /* TODO: add support for expanded Nak */
1111 wpa_printf(MSG_DEBUG, "TLS: Phase 2 Request: Nak type=%d", *pos);
1112 wpa_hexdump(MSG_DEBUG, "TLS: Allowed Phase2 EAP types",
1113 (u8 *) types, num_types * sizeof(struct eap_method_type));
1114 *resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_NAK, num_types,
1115 EAP_CODE_RESPONSE, hdr->identifier);
1119 for (i = 0; i < num_types; i++) {
1120 if (types[i].vendor == EAP_VENDOR_IETF &&
1121 types[i].method < 256)
1122 wpabuf_put_u8(*resp, types[i].method);
1125 eap_update_len(*resp);