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_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 if (os_strstr(txt, "tls_disable_tlsv1_1=1"))
76 params->flags |= TLS_CONN_DISABLE_TLSv1_1;
77 if (os_strstr(txt, "tls_disable_tlsv1_1=0"))
78 params->flags &= ~TLS_CONN_DISABLE_TLSv1_1;
79 if (os_strstr(txt, "tls_disable_tlsv1_2=1"))
80 params->flags |= TLS_CONN_DISABLE_TLSv1_2;
81 if (os_strstr(txt, "tls_disable_tlsv1_2=0"))
82 params->flags &= ~TLS_CONN_DISABLE_TLSv1_2;
86 static void eap_tls_params_from_conf1(struct tls_connection_params *params,
87 struct eap_peer_config *config)
89 params->ca_cert = (char *) config->ca_cert;
90 params->ca_path = (char *) config->ca_path;
91 params->client_cert = (char *) config->client_cert;
92 params->private_key = (char *) config->private_key;
93 params->private_key_passwd = (char *) config->private_key_passwd;
94 params->dh_file = (char *) config->dh_file;
95 params->subject_match = (char *) config->subject_match;
96 params->altsubject_match = (char *) config->altsubject_match;
97 params->suffix_match = config->domain_suffix_match;
98 params->domain_match = config->domain_match;
99 params->engine = config->engine;
100 params->engine_id = config->engine_id;
101 params->pin = config->pin;
102 params->key_id = config->key_id;
103 params->cert_id = config->cert_id;
104 params->ca_cert_id = config->ca_cert_id;
105 eap_tls_params_flags(params, config->phase1);
109 static void eap_tls_params_from_conf2(struct tls_connection_params *params,
110 struct eap_peer_config *config)
112 params->ca_cert = (char *) config->ca_cert2;
113 params->ca_path = (char *) config->ca_path2;
114 params->client_cert = (char *) config->client_cert2;
115 params->private_key = (char *) config->private_key2;
116 params->private_key_passwd = (char *) config->private_key2_passwd;
117 params->dh_file = (char *) config->dh_file2;
118 params->subject_match = (char *) config->subject_match2;
119 params->altsubject_match = (char *) config->altsubject_match2;
120 params->suffix_match = config->domain_suffix_match2;
121 params->domain_match = config->domain_match2;
122 params->engine = config->engine2;
123 params->engine_id = config->engine2_id;
124 params->pin = config->pin2;
125 params->key_id = config->key2_id;
126 params->cert_id = config->cert2_id;
127 params->ca_cert_id = config->ca_cert2_id;
128 eap_tls_params_flags(params, config->phase2);
132 static int eap_tls_params_from_conf(struct eap_sm *sm,
133 struct eap_ssl_data *data,
134 struct tls_connection_params *params,
135 struct eap_peer_config *config, int phase2)
137 os_memset(params, 0, sizeof(*params));
138 if (sm->workaround && data->eap_type != EAP_TYPE_FAST) {
140 * Some deployed authentication servers seem to be unable to
141 * handle the TLS Session Ticket extension (they are supposed
142 * to ignore unrecognized TLS extensions, but end up rejecting
143 * the ClientHello instead). As a workaround, disable use of
144 * TLS Sesson Ticket extension for EAP-TLS, EAP-PEAP, and
145 * EAP-TTLS (EAP-FAST uses session ticket, so any server that
146 * supports EAP-FAST does not need this workaround).
148 params->flags |= TLS_CONN_DISABLE_SESSION_TICKET;
151 wpa_printf(MSG_DEBUG, "TLS: using phase2 config options");
152 eap_tls_params_from_conf2(params, config);
154 wpa_printf(MSG_DEBUG, "TLS: using phase1 config options");
155 eap_tls_params_from_conf1(params, config);
156 if (data->eap_type == EAP_TYPE_FAST)
157 params->flags |= TLS_CONN_EAP_FAST;
161 * Use blob data, if available. Otherwise, leave reference to external
164 if (eap_tls_check_blob(sm, ¶ms->ca_cert, ¶ms->ca_cert_blob,
165 ¶ms->ca_cert_blob_len) ||
166 eap_tls_check_blob(sm, ¶ms->client_cert,
167 ¶ms->client_cert_blob,
168 ¶ms->client_cert_blob_len) ||
169 eap_tls_check_blob(sm, ¶ms->private_key,
170 ¶ms->private_key_blob,
171 ¶ms->private_key_blob_len) ||
172 eap_tls_check_blob(sm, ¶ms->dh_file, ¶ms->dh_blob,
173 ¶ms->dh_blob_len)) {
174 wpa_printf(MSG_INFO, "SSL: Failed to get configuration blobs");
178 params->openssl_ciphers = config->openssl_ciphers;
184 static int eap_tls_init_connection(struct eap_sm *sm,
185 struct eap_ssl_data *data,
186 struct eap_peer_config *config,
187 struct tls_connection_params *params)
192 params->flags |= TLS_CONN_REQUEST_OCSP;
193 if (config->ocsp == 2)
194 params->flags |= TLS_CONN_REQUIRE_OCSP;
195 data->conn = tls_connection_init(data->ssl_ctx);
196 if (data->conn == NULL) {
197 wpa_printf(MSG_INFO, "SSL: Failed to initialize new TLS "
202 res = tls_connection_set_params(data->ssl_ctx, data->conn, params);
203 if (res == TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN) {
205 * At this point with the pkcs11 engine the PIN is wrong. We
206 * reset the PIN in the configuration to be sure to not use it
207 * again and the calling function must request a new one.
210 "TLS: Bad PIN provided, requesting a new one");
211 os_free(config->pin);
213 eap_sm_request_pin(sm);
215 } else if (res == TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED) {
216 wpa_printf(MSG_INFO, "TLS: Failed to initialize engine");
217 } else if (res == TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED) {
218 wpa_printf(MSG_INFO, "TLS: Failed to load private key");
222 wpa_printf(MSG_INFO, "TLS: Failed to set TLS connection "
224 tls_connection_deinit(data->ssl_ctx, data->conn);
234 * eap_peer_tls_ssl_init - Initialize shared TLS functionality
235 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
236 * @data: Data for TLS processing
237 * @config: Pointer to the network configuration
238 * @eap_type: EAP method used in Phase 1 (EAP_TYPE_TLS/PEAP/TTLS/FAST)
239 * Returns: 0 on success, -1 on failure
241 * This function is used to initialize shared TLS functionality for EAP-TLS,
242 * EAP-PEAP, EAP-TTLS, and EAP-FAST.
244 int eap_peer_tls_ssl_init(struct eap_sm *sm, struct eap_ssl_data *data,
245 struct eap_peer_config *config, u8 eap_type)
247 struct tls_connection_params params;
253 data->eap_type = eap_type;
254 data->phase2 = sm->init_phase2;
255 data->ssl_ctx = sm->init_phase2 && sm->ssl_ctx2 ? sm->ssl_ctx2 :
257 if (eap_tls_params_from_conf(sm, data, ¶ms, config, data->phase2) <
261 if (eap_tls_init_connection(sm, data, config, ¶ms) < 0)
264 data->tls_out_limit = config->fragment_size;
266 /* Limit the fragment size in the inner TLS authentication
267 * since the outer authentication with EAP-PEAP does not yet
268 * support fragmentation */
269 if (data->tls_out_limit > 100)
270 data->tls_out_limit -= 100;
273 if (config->phase1 &&
274 os_strstr(config->phase1, "include_tls_length=1")) {
275 wpa_printf(MSG_DEBUG, "TLS: Include TLS Message Length in "
276 "unfragmented packets");
277 data->include_tls_length = 1;
285 * eap_peer_tls_ssl_deinit - Deinitialize shared TLS functionality
286 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
287 * @data: Data for TLS processing
289 * This function deinitializes shared TLS functionality that was initialized
290 * with eap_peer_tls_ssl_init().
292 void eap_peer_tls_ssl_deinit(struct eap_sm *sm, struct eap_ssl_data *data)
294 tls_connection_deinit(data->ssl_ctx, data->conn);
295 eap_peer_tls_reset_input(data);
296 eap_peer_tls_reset_output(data);
301 * eap_peer_tls_derive_key - Derive a key based on TLS session data
302 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
303 * @data: Data for TLS processing
304 * @label: Label string for deriving the keys, e.g., "client EAP encryption"
305 * @len: Length of the key material to generate (usually 64 for MSK)
306 * Returns: Pointer to allocated key on success or %NULL on failure
308 * This function uses TLS-PRF to generate pseudo-random data based on the TLS
309 * session data (client/server random and master key). Each key type may use a
310 * different label to bind the key usage into the generated material.
312 * The caller is responsible for freeing the returned buffer.
314 u8 * eap_peer_tls_derive_key(struct eap_sm *sm, struct eap_ssl_data *data,
315 const char *label, size_t len)
319 out = os_malloc(len);
323 if (tls_connection_prf(data->ssl_ctx, data->conn, label, 0, 0,
334 * eap_peer_tls_derive_session_id - Derive a Session-Id based on TLS data
335 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
336 * @data: Data for TLS processing
337 * @eap_type: EAP method used in Phase 1 (EAP_TYPE_TLS/PEAP/TTLS/FAST)
338 * @len: Pointer to length of the session ID generated
339 * Returns: Pointer to allocated Session-Id on success or %NULL on failure
341 * This function derive the Session-Id based on the TLS session data
342 * (client/server random and method type).
344 * The caller is responsible for freeing the returned buffer.
346 u8 * eap_peer_tls_derive_session_id(struct eap_sm *sm,
347 struct eap_ssl_data *data, u8 eap_type,
350 struct tls_random keys;
353 if (tls_connection_get_random(sm->ssl_ctx, data->conn, &keys))
356 if (keys.client_random == NULL || keys.server_random == NULL)
359 *len = 1 + keys.client_random_len + keys.server_random_len;
360 out = os_malloc(*len);
364 /* Session-Id = EAP type || client.random || server.random */
366 os_memcpy(out + 1, keys.client_random, keys.client_random_len);
367 os_memcpy(out + 1 + keys.client_random_len, keys.server_random,
368 keys.server_random_len);
375 * eap_peer_tls_reassemble_fragment - Reassemble a received fragment
376 * @data: Data for TLS processing
377 * @in_data: Next incoming TLS segment
378 * Returns: 0 on success, 1 if more data is needed for the full message, or
381 static int eap_peer_tls_reassemble_fragment(struct eap_ssl_data *data,
382 const struct wpabuf *in_data)
384 size_t tls_in_len, in_len;
386 tls_in_len = data->tls_in ? wpabuf_len(data->tls_in) : 0;
387 in_len = in_data ? wpabuf_len(in_data) : 0;
389 if (tls_in_len + in_len == 0) {
390 /* No message data received?! */
391 wpa_printf(MSG_WARNING, "SSL: Invalid reassembly state: "
392 "tls_in_left=%lu tls_in_len=%lu in_len=%lu",
393 (unsigned long) data->tls_in_left,
394 (unsigned long) tls_in_len,
395 (unsigned long) in_len);
396 eap_peer_tls_reset_input(data);
400 if (tls_in_len + in_len > 65536) {
402 * Limit length to avoid rogue servers from causing large
403 * memory allocations.
405 wpa_printf(MSG_INFO, "SSL: Too long TLS fragment (size over "
407 eap_peer_tls_reset_input(data);
411 if (in_len > data->tls_in_left) {
412 /* Sender is doing something odd - reject message */
413 wpa_printf(MSG_INFO, "SSL: more data than TLS message length "
415 eap_peer_tls_reset_input(data);
419 if (wpabuf_resize(&data->tls_in, in_len) < 0) {
420 wpa_printf(MSG_INFO, "SSL: Could not allocate memory for TLS "
422 eap_peer_tls_reset_input(data);
426 wpabuf_put_buf(data->tls_in, in_data);
427 data->tls_in_left -= in_len;
429 if (data->tls_in_left > 0) {
430 wpa_printf(MSG_DEBUG, "SSL: Need %lu bytes more input "
431 "data", (unsigned long) data->tls_in_left);
440 * eap_peer_tls_data_reassemble - Reassemble TLS data
441 * @data: Data for TLS processing
442 * @in_data: Next incoming TLS segment
443 * @need_more_input: Variable for returning whether more input data is needed
444 * to reassemble this TLS packet
445 * Returns: Pointer to output data, %NULL on error or when more data is needed
446 * for the full message (in which case, *need_more_input is also set to 1).
448 * This function reassembles TLS fragments. Caller must not free the returned
449 * data buffer since an internal pointer to it is maintained.
451 static const struct wpabuf * eap_peer_tls_data_reassemble(
452 struct eap_ssl_data *data, const struct wpabuf *in_data,
453 int *need_more_input)
455 *need_more_input = 0;
457 if (data->tls_in_left > wpabuf_len(in_data) || data->tls_in) {
458 /* Message has fragments */
459 int res = eap_peer_tls_reassemble_fragment(data, in_data);
462 *need_more_input = 1;
466 /* Message is now fully reassembled. */
468 /* No fragments in this message, so just make a copy of it. */
469 data->tls_in_left = 0;
470 data->tls_in = wpabuf_dup(in_data);
471 if (data->tls_in == NULL)
480 * eap_tls_process_input - Process incoming TLS message
481 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
482 * @data: Data for TLS processing
483 * @in_data: Message received from the server
484 * @out_data: Buffer for returning a pointer to application data (if available)
485 * Returns: 0 on success, 1 if more input data is needed, 2 if application data
486 * is available, -1 on failure
488 static int eap_tls_process_input(struct eap_sm *sm, struct eap_ssl_data *data,
489 const struct wpabuf *in_data,
490 struct wpabuf **out_data)
492 const struct wpabuf *msg;
494 struct wpabuf *appl_data;
496 msg = eap_peer_tls_data_reassemble(data, in_data, &need_more_input);
498 return need_more_input ? 1 : -1;
500 /* Full TLS message reassembled - continue handshake processing */
502 /* This should not happen.. */
503 wpa_printf(MSG_INFO, "SSL: eap_tls_process_input - pending "
504 "tls_out data even though tls_out_len = 0");
505 wpabuf_free(data->tls_out);
506 WPA_ASSERT(data->tls_out == NULL);
509 data->tls_out = tls_connection_handshake(data->ssl_ctx, data->conn,
512 eap_peer_tls_reset_input(data);
515 tls_connection_established(data->ssl_ctx, data->conn) &&
516 !tls_connection_get_failed(data->ssl_ctx, data->conn)) {
517 wpa_hexdump_buf_key(MSG_MSGDUMP, "SSL: Application data",
519 *out_data = appl_data;
523 wpabuf_free(appl_data);
530 * eap_tls_process_output - Process outgoing TLS message
531 * @data: Data for TLS processing
532 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
533 * @peap_version: Version number for EAP-PEAP/TTLS
534 * @id: EAP identifier for the response
535 * @ret: Return value to use on success
536 * @out_data: Buffer for returning the allocated output buffer
537 * Returns: ret (0 or 1) on success, -1 on failure
539 static int eap_tls_process_output(struct eap_ssl_data *data, EapType eap_type,
540 int peap_version, u8 id, int ret,
541 struct wpabuf **out_data)
545 int more_fragments, length_included;
547 if (data->tls_out == NULL)
549 len = wpabuf_len(data->tls_out) - data->tls_out_pos;
550 wpa_printf(MSG_DEBUG, "SSL: %lu bytes left to be sent out (of total "
553 (unsigned long) wpabuf_len(data->tls_out));
556 * Limit outgoing message to the configured maximum size. Fragment
559 if (len > data->tls_out_limit) {
561 len = data->tls_out_limit;
562 wpa_printf(MSG_DEBUG, "SSL: sending %lu bytes, more fragments "
563 "will follow", (unsigned long) len);
567 length_included = data->tls_out_pos == 0 &&
568 (wpabuf_len(data->tls_out) > data->tls_out_limit ||
569 data->include_tls_length);
570 if (!length_included &&
571 eap_type == EAP_TYPE_PEAP && peap_version == 0 &&
572 !tls_connection_established(data->eap->ssl_ctx, data->conn)) {
574 * Windows Server 2008 NPS really wants to have the TLS Message
575 * length included in phase 0 even for unfragmented frames or
576 * it will get very confused with Compound MAC calculation and
582 *out_data = eap_tls_msg_alloc(eap_type, 1 + length_included * 4 + len,
583 EAP_CODE_RESPONSE, id);
584 if (*out_data == NULL)
587 flags = wpabuf_put(*out_data, 1);
588 *flags = peap_version;
590 *flags |= EAP_TLS_FLAGS_MORE_FRAGMENTS;
591 if (length_included) {
592 *flags |= EAP_TLS_FLAGS_LENGTH_INCLUDED;
593 wpabuf_put_be32(*out_data, wpabuf_len(data->tls_out));
596 wpabuf_put_data(*out_data,
597 wpabuf_head_u8(data->tls_out) + data->tls_out_pos,
599 data->tls_out_pos += len;
602 eap_peer_tls_reset_output(data);
609 * eap_peer_tls_process_helper - Process TLS handshake message
610 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
611 * @data: Data for TLS processing
612 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
613 * @peap_version: Version number for EAP-PEAP/TTLS
614 * @id: EAP identifier for the response
615 * @in_data: Message received from the server
616 * @out_data: Buffer for returning a pointer to the response message
617 * Returns: 0 on success, 1 if more input data is needed, 2 if application data
618 * is available, or -1 on failure
620 * This function can be used to process TLS handshake messages. It reassembles
621 * the received fragments and uses a TLS library to process the messages. The
622 * response data from the TLS library is fragmented to suitable output messages
623 * that the caller can send out.
625 * out_data is used to return the response message if the return value of this
626 * function is 0, 2, or -1. In case of failure, the message is likely a TLS
627 * alarm message. The caller is responsible for freeing the allocated buffer if
628 * *out_data is not %NULL.
630 * This function is called for each received TLS message during the TLS
631 * handshake after eap_peer_tls_process_init() call and possible processing of
632 * TLS Flags field. Once the handshake has been completed, i.e., when
633 * tls_connection_established() returns 1, EAP method specific decrypting of
634 * the tunneled data is used.
636 int eap_peer_tls_process_helper(struct eap_sm *sm, struct eap_ssl_data *data,
637 EapType eap_type, int peap_version,
638 u8 id, const struct wpabuf *in_data,
639 struct wpabuf **out_data)
645 if (data->tls_out && wpabuf_len(data->tls_out) > 0 &&
646 wpabuf_len(in_data) > 0) {
647 wpa_printf(MSG_DEBUG, "SSL: Received non-ACK when output "
648 "fragments are waiting to be sent out");
652 if (data->tls_out == NULL || wpabuf_len(data->tls_out) == 0) {
654 * No more data to send out - expect to receive more data from
657 int res = eap_tls_process_input(sm, data, in_data, out_data);
660 * Input processing failed (res = -1) or more data is
667 * The incoming message has been reassembled and processed. The
668 * response was allocated into data->tls_out buffer.
672 if (data->tls_out == NULL) {
674 * No outgoing fragments remaining from the previous message
675 * and no new message generated. This indicates an error in TLS
678 eap_peer_tls_reset_output(data);
682 if (tls_connection_get_failed(data->ssl_ctx, data->conn)) {
683 /* TLS processing has failed - return error */
684 wpa_printf(MSG_DEBUG, "SSL: Failed - tls_out available to "
685 "report error (len=%u)",
686 (unsigned int) wpabuf_len(data->tls_out));
688 /* TODO: clean pin if engine used? */
689 if (wpabuf_len(data->tls_out) == 0) {
690 wpabuf_free(data->tls_out);
691 data->tls_out = NULL;
696 if (wpabuf_len(data->tls_out) == 0) {
698 * TLS negotiation should now be complete since all other cases
699 * needing more data should have been caught above based on
700 * the TLS Message Length field.
702 wpa_printf(MSG_DEBUG, "SSL: No data to be sent out");
703 wpabuf_free(data->tls_out);
704 data->tls_out = NULL;
708 /* Send the pending message (in fragments, if needed). */
709 return eap_tls_process_output(data, eap_type, peap_version, id, ret,
715 * eap_peer_tls_build_ack - Build a TLS ACK frame
716 * @id: EAP identifier for the response
717 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
718 * @peap_version: Version number for EAP-PEAP/TTLS
719 * Returns: Pointer to the allocated ACK frame or %NULL on failure
721 struct wpabuf * eap_peer_tls_build_ack(u8 id, EapType eap_type,
726 resp = eap_tls_msg_alloc(eap_type, 1, EAP_CODE_RESPONSE, id);
729 wpa_printf(MSG_DEBUG, "SSL: Building ACK (type=%d id=%d ver=%d)",
730 (int) eap_type, id, peap_version);
731 wpabuf_put_u8(resp, peap_version); /* Flags */
737 * eap_peer_tls_reauth_init - Re-initialize shared TLS for session resumption
738 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
739 * @data: Data for TLS processing
740 * Returns: 0 on success, -1 on failure
742 int eap_peer_tls_reauth_init(struct eap_sm *sm, struct eap_ssl_data *data)
744 eap_peer_tls_reset_input(data);
745 eap_peer_tls_reset_output(data);
746 return tls_connection_shutdown(data->ssl_ctx, data->conn);
751 * eap_peer_tls_status - Get TLS status
752 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
753 * @data: Data for TLS processing
754 * @buf: Buffer for status information
755 * @buflen: Maximum buffer length
756 * @verbose: Whether to include verbose status information
757 * Returns: Number of bytes written to buf.
759 int eap_peer_tls_status(struct eap_sm *sm, struct eap_ssl_data *data,
760 char *buf, size_t buflen, int verbose)
762 char version[20], name[128];
765 if (tls_get_version(data->ssl_ctx, data->conn, version,
766 sizeof(version)) < 0)
768 if (tls_get_cipher(data->ssl_ctx, data->conn, name, sizeof(name)) < 0)
771 ret = os_snprintf(buf + len, buflen - len,
772 "eap_tls_version=%s\n"
773 "EAP TLS cipher=%s\n"
774 "tls_session_reused=%d\n",
776 tls_connection_resumed(data->ssl_ctx, data->conn));
777 if (os_snprintf_error(buflen - len, ret))
786 * eap_peer_tls_process_init - Initial validation/processing of EAP requests
787 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
788 * @data: Data for TLS processing
789 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
790 * @ret: Return values from EAP request validation and processing
791 * @reqData: EAP request to be processed (eapReqData)
792 * @len: Buffer for returning length of the remaining payload
793 * @flags: Buffer for returning TLS flags
794 * Returns: Pointer to payload after TLS flags and length or %NULL on failure
796 * This function validates the EAP header and processes the optional TLS
797 * Message Length field. If this is the first fragment of a TLS message, the
798 * TLS reassembly code is initialized to receive the indicated number of bytes.
800 * EAP-TLS, EAP-PEAP, EAP-TTLS, and EAP-FAST methods are expected to use this
801 * function as the first step in processing received messages. They will need
802 * to process the flags (apart from Message Length Included) that are returned
803 * through the flags pointer and the message payload that will be returned (and
804 * the length is returned through the len pointer). Return values (ret) are set
805 * for continuation of EAP method processing. The caller is responsible for
806 * setting these to indicate completion (either success or failure) based on
807 * the authentication result.
809 const u8 * eap_peer_tls_process_init(struct eap_sm *sm,
810 struct eap_ssl_data *data,
812 struct eap_method_ret *ret,
813 const struct wpabuf *reqData,
814 size_t *len, u8 *flags)
818 unsigned int tls_msg_len;
820 if (tls_get_errors(data->ssl_ctx)) {
821 wpa_printf(MSG_INFO, "SSL: TLS errors detected");
826 if (eap_type == EAP_UNAUTH_TLS_TYPE)
827 pos = eap_hdr_validate(EAP_VENDOR_UNAUTH_TLS,
828 EAP_VENDOR_TYPE_UNAUTH_TLS, reqData,
830 else if (eap_type == EAP_WFA_UNAUTH_TLS_TYPE)
831 pos = eap_hdr_validate(EAP_VENDOR_WFA_NEW,
832 EAP_VENDOR_WFA_UNAUTH_TLS, reqData,
835 pos = eap_hdr_validate(EAP_VENDOR_IETF, eap_type, reqData,
842 wpa_printf(MSG_DEBUG, "SSL: Invalid TLS message: no Flags "
844 if (!sm->workaround) {
849 wpa_printf(MSG_DEBUG, "SSL: Workaround - assume no Flags "
850 "indicates ACK frame");
856 wpa_printf(MSG_DEBUG, "SSL: Received packet(len=%lu) - "
857 "Flags 0x%02x", (unsigned long) wpabuf_len(reqData),
859 if (*flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) {
861 wpa_printf(MSG_INFO, "SSL: Short frame with TLS "
866 tls_msg_len = WPA_GET_BE32(pos);
867 wpa_printf(MSG_DEBUG, "SSL: TLS Message Length: %d",
869 if (data->tls_in_left == 0) {
870 data->tls_in_total = tls_msg_len;
871 data->tls_in_left = tls_msg_len;
872 wpabuf_free(data->tls_in);
878 if (left > tls_msg_len) {
879 wpa_printf(MSG_INFO, "SSL: TLS Message Length (%d "
880 "bytes) smaller than this fragment (%d "
881 "bytes)", (int) tls_msg_len, (int) left);
888 ret->methodState = METHOD_MAY_CONT;
889 ret->decision = DECISION_FAIL;
890 ret->allowNotifications = TRUE;
898 * eap_peer_tls_reset_input - Reset input buffers
899 * @data: Data for TLS processing
901 * This function frees any allocated memory for input buffers and resets input
904 void eap_peer_tls_reset_input(struct eap_ssl_data *data)
906 data->tls_in_left = data->tls_in_total = 0;
907 wpabuf_free(data->tls_in);
913 * eap_peer_tls_reset_output - Reset output buffers
914 * @data: Data for TLS processing
916 * This function frees any allocated memory for output buffers and resets
919 void eap_peer_tls_reset_output(struct eap_ssl_data *data)
921 data->tls_out_pos = 0;
922 wpabuf_free(data->tls_out);
923 data->tls_out = NULL;
928 * eap_peer_tls_decrypt - Decrypt received phase 2 TLS message
929 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
930 * @data: Data for TLS processing
931 * @in_data: Message received from the server
932 * @in_decrypted: Buffer for returning a pointer to the decrypted message
933 * Returns: 0 on success, 1 if more input data is needed, or -1 on failure
935 int eap_peer_tls_decrypt(struct eap_sm *sm, struct eap_ssl_data *data,
936 const struct wpabuf *in_data,
937 struct wpabuf **in_decrypted)
939 const struct wpabuf *msg;
942 msg = eap_peer_tls_data_reassemble(data, in_data, &need_more_input);
944 return need_more_input ? 1 : -1;
946 *in_decrypted = tls_connection_decrypt(data->ssl_ctx, data->conn, msg);
947 eap_peer_tls_reset_input(data);
948 if (*in_decrypted == NULL) {
949 wpa_printf(MSG_INFO, "SSL: Failed to decrypt Phase 2 data");
957 * eap_peer_tls_encrypt - Encrypt phase 2 TLS message
958 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
959 * @data: Data for TLS processing
960 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
961 * @peap_version: Version number for EAP-PEAP/TTLS
962 * @id: EAP identifier for the response
963 * @in_data: Plaintext phase 2 data to encrypt or %NULL to continue fragments
964 * @out_data: Buffer for returning a pointer to the encrypted response message
965 * Returns: 0 on success, -1 on failure
967 int eap_peer_tls_encrypt(struct eap_sm *sm, struct eap_ssl_data *data,
968 EapType eap_type, int peap_version, u8 id,
969 const struct wpabuf *in_data,
970 struct wpabuf **out_data)
973 eap_peer_tls_reset_output(data);
974 data->tls_out = tls_connection_encrypt(data->ssl_ctx,
975 data->conn, in_data);
976 if (data->tls_out == NULL) {
977 wpa_printf(MSG_INFO, "SSL: Failed to encrypt Phase 2 "
979 (unsigned long) wpabuf_len(in_data));
980 eap_peer_tls_reset_output(data);
985 return eap_tls_process_output(data, eap_type, peap_version, id, 0,
991 * eap_peer_select_phase2_methods - Select phase 2 EAP method
992 * @config: Pointer to the network configuration
993 * @prefix: 'phase2' configuration prefix, e.g., "auth="
994 * @types: Buffer for returning allocated list of allowed EAP methods
995 * @num_types: Buffer for returning number of allocated EAP methods
996 * Returns: 0 on success, -1 on failure
998 * This function is used to parse EAP method list and select allowed methods
999 * for Phase2 authentication.
1001 int eap_peer_select_phase2_methods(struct eap_peer_config *config,
1003 struct eap_method_type **types,
1006 char *start, *pos, *buf;
1007 struct eap_method_type *methods = NULL, *_methods;
1009 size_t num_methods = 0, prefix_len;
1011 if (config == NULL || config->phase2 == NULL)
1014 start = buf = os_strdup(config->phase2);
1018 prefix_len = os_strlen(prefix);
1020 while (start && *start != '\0') {
1022 pos = os_strstr(start, prefix);
1025 if (start != pos && *(pos - 1) != ' ') {
1026 start = pos + prefix_len;
1030 start = pos + prefix_len;
1031 pos = os_strchr(start, ' ');
1034 method = eap_get_phase2_type(start, &vendor);
1035 if (vendor == EAP_VENDOR_IETF && method == EAP_TYPE_NONE) {
1036 wpa_printf(MSG_ERROR, "TLS: Unsupported Phase2 EAP "
1037 "method '%s'", start);
1040 _methods = os_realloc_array(methods, num_methods,
1042 if (_methods == NULL) {
1048 methods[num_methods - 1].vendor = vendor;
1049 methods[num_methods - 1].method = method;
1058 if (methods == NULL)
1059 methods = eap_get_phase2_types(config, &num_methods);
1061 if (methods == NULL) {
1062 wpa_printf(MSG_ERROR, "TLS: No Phase2 EAP methods available");
1065 wpa_hexdump(MSG_DEBUG, "TLS: Phase2 EAP types",
1067 num_methods * sizeof(struct eap_method_type));
1070 *num_types = num_methods;
1077 * eap_peer_tls_phase2_nak - Generate EAP-Nak for Phase 2
1078 * @types: Buffer for returning allocated list of allowed EAP methods
1079 * @num_types: Buffer for returning number of allocated EAP methods
1080 * @hdr: EAP-Request header (and the following EAP type octet)
1081 * @resp: Buffer for returning the EAP-Nak message
1082 * Returns: 0 on success, -1 on failure
1084 int eap_peer_tls_phase2_nak(struct eap_method_type *types, size_t num_types,
1085 struct eap_hdr *hdr, struct wpabuf **resp)
1087 u8 *pos = (u8 *) (hdr + 1);
1090 /* TODO: add support for expanded Nak */
1091 wpa_printf(MSG_DEBUG, "TLS: Phase 2 Request: Nak type=%d", *pos);
1092 wpa_hexdump(MSG_DEBUG, "TLS: Allowed Phase2 EAP types",
1093 (u8 *) types, num_types * sizeof(struct eap_method_type));
1094 *resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_NAK, num_types,
1095 EAP_CODE_RESPONSE, hdr->identifier);
1099 for (i = 0; i < num_types; i++) {
1100 if (types[i].vendor == EAP_VENDOR_IETF &&
1101 types[i].method < 256)
1102 wpabuf_put_u8(*resp, types[i].method);
1105 eap_update_len(*resp);