2 * EAP peer: EAP-TLS/PEAP/TTLS/FAST common functions
3 * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * Alternatively, this software may be distributed under the terms of BSD
12 * See README and COPYING for more details.
18 #include "crypto/sha1.h"
19 #include "crypto/tls.h"
21 #include "eap_tls_common.h"
22 #include "eap_config.h"
25 static int eap_tls_check_blob(struct eap_sm *sm, const char **name,
26 const u8 **data, size_t *data_len)
28 const struct wpa_config_blob *blob;
30 if (*name == NULL || os_strncmp(*name, "blob://", 7) != 0)
33 blob = eap_get_config_blob(sm, *name + 7);
35 wpa_printf(MSG_ERROR, "%s: Named configuration blob '%s' not "
36 "found", __func__, *name + 7);
42 *data_len = blob->len;
48 static void eap_tls_params_flags(struct tls_connection_params *params,
53 if (os_strstr(txt, "tls_allow_md5=1"))
54 params->flags |= TLS_CONN_ALLOW_SIGN_RSA_MD5;
55 if (os_strstr(txt, "tls_disable_time_checks=1"))
56 params->flags |= TLS_CONN_DISABLE_TIME_CHECKS;
60 static void eap_tls_params_from_conf1(struct tls_connection_params *params,
61 struct eap_peer_config *config)
63 params->ca_cert = (char *) config->ca_cert;
64 params->ca_path = (char *) config->ca_path;
65 params->client_cert = (char *) config->client_cert;
66 params->private_key = (char *) config->private_key;
67 params->private_key_passwd = (char *) config->private_key_passwd;
68 params->dh_file = (char *) config->dh_file;
69 params->subject_match = (char *) config->subject_match;
70 params->altsubject_match = (char *) config->altsubject_match;
71 params->engine = config->engine;
72 params->engine_id = config->engine_id;
73 params->pin = config->pin;
74 params->key_id = config->key_id;
75 params->cert_id = config->cert_id;
76 params->ca_cert_id = config->ca_cert_id;
77 eap_tls_params_flags(params, config->phase1);
81 static void eap_tls_params_from_conf2(struct tls_connection_params *params,
82 struct eap_peer_config *config)
84 params->ca_cert = (char *) config->ca_cert2;
85 params->ca_path = (char *) config->ca_path2;
86 params->client_cert = (char *) config->client_cert2;
87 params->private_key = (char *) config->private_key2;
88 params->private_key_passwd = (char *) config->private_key2_passwd;
89 params->dh_file = (char *) config->dh_file2;
90 params->subject_match = (char *) config->subject_match2;
91 params->altsubject_match = (char *) config->altsubject_match2;
92 params->engine = config->engine2;
93 params->engine_id = config->engine2_id;
94 params->pin = config->pin2;
95 params->key_id = config->key2_id;
96 params->cert_id = config->cert2_id;
97 params->ca_cert_id = config->ca_cert2_id;
98 eap_tls_params_flags(params, config->phase2);
102 static int eap_tls_params_from_conf(struct eap_sm *sm,
103 struct eap_ssl_data *data,
104 struct tls_connection_params *params,
105 struct eap_peer_config *config, int phase2)
107 os_memset(params, 0, sizeof(*params));
109 wpa_printf(MSG_DEBUG, "TLS: using phase2 config options");
110 eap_tls_params_from_conf2(params, config);
112 wpa_printf(MSG_DEBUG, "TLS: using phase1 config options");
113 eap_tls_params_from_conf1(params, config);
115 params->tls_ia = data->tls_ia;
118 * Use blob data, if available. Otherwise, leave reference to external
121 if (eap_tls_check_blob(sm, ¶ms->ca_cert, ¶ms->ca_cert_blob,
122 ¶ms->ca_cert_blob_len) ||
123 eap_tls_check_blob(sm, ¶ms->client_cert,
124 ¶ms->client_cert_blob,
125 ¶ms->client_cert_blob_len) ||
126 eap_tls_check_blob(sm, ¶ms->private_key,
127 ¶ms->private_key_blob,
128 ¶ms->private_key_blob_len) ||
129 eap_tls_check_blob(sm, ¶ms->dh_file, ¶ms->dh_blob,
130 ¶ms->dh_blob_len)) {
131 wpa_printf(MSG_INFO, "SSL: Failed to get configuration blobs");
139 static int eap_tls_init_connection(struct eap_sm *sm,
140 struct eap_ssl_data *data,
141 struct eap_peer_config *config,
142 struct tls_connection_params *params)
146 data->conn = tls_connection_init(sm->ssl_ctx);
147 if (data->conn == NULL) {
148 wpa_printf(MSG_INFO, "SSL: Failed to initialize new TLS "
153 res = tls_connection_set_params(sm->ssl_ctx, data->conn, params);
154 if (res == TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED) {
156 * At this point with the pkcs11 engine the PIN might be wrong.
157 * We reset the PIN in the configuration to be sure to not use
158 * it again and the calling function must request a new one.
160 os_free(config->pin);
162 } else if (res == TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED) {
163 wpa_printf(MSG_INFO, "TLS: Failed to load private key");
165 * We do not know exactly but maybe the PIN was wrong,
166 * so ask for a new one.
168 os_free(config->pin);
170 eap_sm_request_pin(sm);
172 tls_connection_deinit(sm->ssl_ctx, data->conn);
176 wpa_printf(MSG_INFO, "TLS: Failed to set TLS connection "
178 tls_connection_deinit(sm->ssl_ctx, data->conn);
188 * eap_peer_tls_ssl_init - Initialize shared TLS functionality
189 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
190 * @data: Data for TLS processing
191 * @config: Pointer to the network configuration
192 * Returns: 0 on success, -1 on failure
194 * This function is used to initialize shared TLS functionality for EAP-TLS,
195 * EAP-PEAP, EAP-TTLS, and EAP-FAST.
197 int eap_peer_tls_ssl_init(struct eap_sm *sm, struct eap_ssl_data *data,
198 struct eap_peer_config *config)
200 struct tls_connection_params params;
206 data->phase2 = sm->init_phase2;
207 if (eap_tls_params_from_conf(sm, data, ¶ms, config, data->phase2) <
211 if (eap_tls_init_connection(sm, data, config, ¶ms) < 0)
214 data->tls_out_limit = config->fragment_size;
216 /* Limit the fragment size in the inner TLS authentication
217 * since the outer authentication with EAP-PEAP does not yet
218 * support fragmentation */
219 if (data->tls_out_limit > 100)
220 data->tls_out_limit -= 100;
223 if (config->phase1 &&
224 os_strstr(config->phase1, "include_tls_length=1")) {
225 wpa_printf(MSG_DEBUG, "TLS: Include TLS Message Length in "
226 "unfragmented packets");
227 data->include_tls_length = 1;
235 * eap_peer_tls_ssl_deinit - Deinitialize shared TLS functionality
236 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
237 * @data: Data for TLS processing
239 * This function deinitializes shared TLS functionality that was initialized
240 * with eap_peer_tls_ssl_init().
242 void eap_peer_tls_ssl_deinit(struct eap_sm *sm, struct eap_ssl_data *data)
244 tls_connection_deinit(sm->ssl_ctx, data->conn);
245 eap_peer_tls_reset_input(data);
246 eap_peer_tls_reset_output(data);
251 * eap_peer_tls_derive_key - Derive a key based on TLS session data
252 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
253 * @data: Data for TLS processing
254 * @label: Label string for deriving the keys, e.g., "client EAP encryption"
255 * @len: Length of the key material to generate (usually 64 for MSK)
256 * Returns: Pointer to allocated key on success or %NULL on failure
258 * This function uses TLS-PRF to generate pseudo-random data based on the TLS
259 * session data (client/server random and master key). Each key type may use a
260 * different label to bind the key usage into the generated material.
262 * The caller is responsible for freeing the returned buffer.
264 u8 * eap_peer_tls_derive_key(struct eap_sm *sm, struct eap_ssl_data *data,
265 const char *label, size_t len)
267 struct tls_keys keys;
268 u8 *rnd = NULL, *out;
270 out = os_malloc(len);
274 /* First, try to use TLS library function for PRF, if available. */
275 if (tls_connection_prf(sm->ssl_ctx, data->conn, label, 0, out, len) ==
280 * TLS library did not support key generation, so get the needed TLS
281 * session parameters and use an internal implementation of TLS PRF to
284 if (tls_connection_get_keys(sm->ssl_ctx, data->conn, &keys))
287 if (keys.client_random == NULL || keys.server_random == NULL ||
288 keys.master_key == NULL)
291 rnd = os_malloc(keys.client_random_len + keys.server_random_len);
294 os_memcpy(rnd, keys.client_random, keys.client_random_len);
295 os_memcpy(rnd + keys.client_random_len, keys.server_random,
296 keys.server_random_len);
298 if (tls_prf(keys.master_key, keys.master_key_len,
299 label, rnd, keys.client_random_len +
300 keys.server_random_len, out, len))
314 * eap_peer_tls_reassemble_fragment - Reassemble a received fragment
315 * @data: Data for TLS processing
316 * @in_data: Next incoming TLS segment
317 * Returns: 0 on success, 1 if more data is needed for the full message, or
320 static int eap_peer_tls_reassemble_fragment(struct eap_ssl_data *data,
321 const struct wpabuf *in_data)
323 size_t tls_in_len, in_len;
325 tls_in_len = data->tls_in ? wpabuf_len(data->tls_in) : 0;
326 in_len = in_data ? wpabuf_len(in_data) : 0;
328 if (tls_in_len + in_len == 0) {
329 /* No message data received?! */
330 wpa_printf(MSG_WARNING, "SSL: Invalid reassembly state: "
331 "tls_in_left=%lu tls_in_len=%lu in_len=%lu",
332 (unsigned long) data->tls_in_left,
333 (unsigned long) tls_in_len,
334 (unsigned long) in_len);
335 eap_peer_tls_reset_input(data);
339 if (tls_in_len + in_len > 65536) {
341 * Limit length to avoid rogue servers from causing large
342 * memory allocations.
344 wpa_printf(MSG_INFO, "SSL: Too long TLS fragment (size over "
346 eap_peer_tls_reset_input(data);
350 if (in_len > data->tls_in_left) {
351 /* Sender is doing something odd - reject message */
352 wpa_printf(MSG_INFO, "SSL: more data than TLS message length "
354 eap_peer_tls_reset_input(data);
358 if (wpabuf_resize(&data->tls_in, in_len) < 0) {
359 wpa_printf(MSG_INFO, "SSL: Could not allocate memory for TLS "
361 eap_peer_tls_reset_input(data);
364 wpabuf_put_buf(data->tls_in, in_data);
365 data->tls_in_left -= in_len;
367 if (data->tls_in_left > 0) {
368 wpa_printf(MSG_DEBUG, "SSL: Need %lu bytes more input "
369 "data", (unsigned long) data->tls_in_left);
378 * eap_peer_tls_data_reassemble - Reassemble TLS data
379 * @data: Data for TLS processing
380 * @in_data: Next incoming TLS segment
381 * @need_more_input: Variable for returning whether more input data is needed
382 * to reassemble this TLS packet
383 * Returns: Pointer to output data, %NULL on error or when more data is needed
384 * for the full message (in which case, *need_more_input is also set to 1).
386 * This function reassembles TLS fragments. Caller must not free the returned
387 * data buffer since an internal pointer to it is maintained.
389 static const struct wpabuf * eap_peer_tls_data_reassemble(
390 struct eap_ssl_data *data, const struct wpabuf *in_data,
391 int *need_more_input)
393 *need_more_input = 0;
395 if (data->tls_in_left > wpabuf_len(in_data) || data->tls_in) {
396 /* Message has fragments */
397 int res = eap_peer_tls_reassemble_fragment(data, in_data);
400 *need_more_input = 1;
404 /* Message is now fully reassembled. */
406 /* No fragments in this message, so just make a copy of it. */
407 data->tls_in_left = 0;
408 data->tls_in = wpabuf_dup(in_data);
409 if (data->tls_in == NULL)
418 * eap_tls_process_input - Process incoming TLS message
419 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
420 * @data: Data for TLS processing
421 * @in_data: Message received from the server
422 * @in_len: Length of in_data
423 * @out_data: Buffer for returning a pointer to application data (if available)
424 * Returns: 0 on success, 1 if more input data is needed, 2 if application data
425 * is available, -1 on failure
427 static int eap_tls_process_input(struct eap_sm *sm, struct eap_ssl_data *data,
428 const u8 *in_data, size_t in_len,
429 struct wpabuf **out_data)
431 const struct wpabuf *msg;
433 struct wpabuf *appl_data;
436 wpabuf_set(&buf, in_data, in_len);
437 msg = eap_peer_tls_data_reassemble(data, &buf, &need_more_input);
439 return need_more_input ? 1 : -1;
441 /* Full TLS message reassembled - continue handshake processing */
443 /* This should not happen.. */
444 wpa_printf(MSG_INFO, "SSL: eap_tls_process_input - pending "
445 "tls_out data even though tls_out_len = 0");
446 wpabuf_free(data->tls_out);
447 WPA_ASSERT(data->tls_out == NULL);
450 data->tls_out = tls_connection_handshake(sm->ssl_ctx, data->conn,
453 eap_peer_tls_reset_input(data);
456 tls_connection_established(sm->ssl_ctx, data->conn) &&
457 !tls_connection_get_failed(sm->ssl_ctx, data->conn)) {
458 wpa_hexdump_buf_key(MSG_MSGDUMP, "SSL: Application data",
460 *out_data = appl_data;
464 wpabuf_free(appl_data);
471 * eap_tls_process_output - Process outgoing TLS message
472 * @data: Data for TLS processing
473 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
474 * @peap_version: Version number for EAP-PEAP/TTLS
475 * @id: EAP identifier for the response
476 * @ret: Return value to use on success
477 * @out_data: Buffer for returning the allocated output buffer
478 * Returns: ret (0 or 1) on success, -1 on failure
480 static int eap_tls_process_output(struct eap_ssl_data *data, EapType eap_type,
481 int peap_version, u8 id, int ret,
482 struct wpabuf **out_data)
486 int more_fragments, length_included;
488 if (data->tls_out == NULL)
490 len = wpabuf_len(data->tls_out) - data->tls_out_pos;
491 wpa_printf(MSG_DEBUG, "SSL: %lu bytes left to be sent out (of total "
494 (unsigned long) wpabuf_len(data->tls_out));
497 * Limit outgoing message to the configured maximum size. Fragment
500 if (len > data->tls_out_limit) {
502 len = data->tls_out_limit;
503 wpa_printf(MSG_DEBUG, "SSL: sending %lu bytes, more fragments "
504 "will follow", (unsigned long) len);
508 length_included = data->tls_out_pos == 0 &&
509 (wpabuf_len(data->tls_out) > data->tls_out_limit ||
510 data->include_tls_length);
511 if (!length_included &&
512 eap_type == EAP_TYPE_PEAP && peap_version == 0 &&
513 !tls_connection_established(data->eap->ssl_ctx, data->conn)) {
515 * Windows Server 2008 NPS really wants to have the TLS Message
516 * length included in phase 0 even for unfragmented frames or
517 * it will get very confused with Compound MAC calculation and
523 *out_data = eap_msg_alloc(EAP_VENDOR_IETF, eap_type,
524 1 + length_included * 4 + len,
525 EAP_CODE_RESPONSE, id);
526 if (*out_data == NULL)
529 flags = wpabuf_put(*out_data, 1);
530 *flags = peap_version;
532 *flags |= EAP_TLS_FLAGS_MORE_FRAGMENTS;
533 if (length_included) {
534 *flags |= EAP_TLS_FLAGS_LENGTH_INCLUDED;
535 wpabuf_put_be32(*out_data, wpabuf_len(data->tls_out));
538 wpabuf_put_data(*out_data,
539 wpabuf_head_u8(data->tls_out) + data->tls_out_pos,
541 data->tls_out_pos += len;
544 eap_peer_tls_reset_output(data);
551 * eap_peer_tls_process_helper - Process TLS handshake message
552 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
553 * @data: Data for TLS processing
554 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
555 * @peap_version: Version number for EAP-PEAP/TTLS
556 * @id: EAP identifier for the response
557 * @in_data: Message received from the server
558 * @in_len: Length of in_data
559 * @out_data: Buffer for returning a pointer to the response message
560 * Returns: 0 on success, 1 if more input data is needed, 2 if application data
561 * is available, or -1 on failure
563 * This function can be used to process TLS handshake messages. It reassembles
564 * the received fragments and uses a TLS library to process the messages. The
565 * response data from the TLS library is fragmented to suitable output messages
566 * that the caller can send out.
568 * out_data is used to return the response message if the return value of this
569 * function is 0, 2, or -1. In case of failure, the message is likely a TLS
570 * alarm message. The caller is responsible for freeing the allocated buffer if
571 * *out_data is not %NULL.
573 * This function is called for each received TLS message during the TLS
574 * handshake after eap_peer_tls_process_init() call and possible processing of
575 * TLS Flags field. Once the handshake has been completed, i.e., when
576 * tls_connection_established() returns 1, EAP method specific decrypting of
577 * the tunneled data is used.
579 int eap_peer_tls_process_helper(struct eap_sm *sm, struct eap_ssl_data *data,
580 EapType eap_type, int peap_version,
581 u8 id, const u8 *in_data, size_t in_len,
582 struct wpabuf **out_data)
588 if (data->tls_out && wpabuf_len(data->tls_out) > 0 && in_len > 0) {
589 wpa_printf(MSG_DEBUG, "SSL: Received non-ACK when output "
590 "fragments are waiting to be sent out");
594 if (data->tls_out == NULL || wpabuf_len(data->tls_out) == 0) {
596 * No more data to send out - expect to receive more data from
599 int res = eap_tls_process_input(sm, data, in_data, in_len,
603 * Input processing failed (res = -1) or more data is
610 * The incoming message has been reassembled and processed. The
611 * response was allocated into data->tls_out buffer.
615 if (data->tls_out == NULL) {
617 * No outgoing fragments remaining from the previous message
618 * and no new message generated. This indicates an error in TLS
621 eap_peer_tls_reset_output(data);
625 if (tls_connection_get_failed(sm->ssl_ctx, data->conn)) {
626 /* TLS processing has failed - return error */
627 wpa_printf(MSG_DEBUG, "SSL: Failed - tls_out available to "
630 /* TODO: clean pin if engine used? */
633 if (data->tls_out == NULL || wpabuf_len(data->tls_out) == 0) {
635 * TLS negotiation should now be complete since all other cases
636 * needing more data should have been caught above based on
637 * the TLS Message Length field.
639 wpa_printf(MSG_DEBUG, "SSL: No data to be sent out");
640 wpabuf_free(data->tls_out);
641 data->tls_out = NULL;
645 /* Send the pending message (in fragments, if needed). */
646 return eap_tls_process_output(data, eap_type, peap_version, id, ret,
652 * eap_peer_tls_build_ack - Build a TLS ACK frame
653 * @id: EAP identifier for the response
654 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
655 * @peap_version: Version number for EAP-PEAP/TTLS
656 * Returns: Pointer to the allocated ACK frame or %NULL on failure
658 struct wpabuf * eap_peer_tls_build_ack(u8 id, EapType eap_type,
663 resp = eap_msg_alloc(EAP_VENDOR_IETF, eap_type, 1, EAP_CODE_RESPONSE,
667 wpa_printf(MSG_DEBUG, "SSL: Building ACK (type=%d id=%d ver=%d)",
668 (int) eap_type, id, peap_version);
669 wpabuf_put_u8(resp, peap_version); /* Flags */
675 * eap_peer_tls_reauth_init - Re-initialize shared TLS for session resumption
676 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
677 * @data: Data for TLS processing
678 * Returns: 0 on success, -1 on failure
680 int eap_peer_tls_reauth_init(struct eap_sm *sm, struct eap_ssl_data *data)
682 eap_peer_tls_reset_input(data);
683 eap_peer_tls_reset_output(data);
684 return tls_connection_shutdown(sm->ssl_ctx, data->conn);
689 * eap_peer_tls_status - Get TLS status
690 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
691 * @data: Data for TLS processing
692 * @buf: Buffer for status information
693 * @buflen: Maximum buffer length
694 * @verbose: Whether to include verbose status information
695 * Returns: Number of bytes written to buf.
697 int eap_peer_tls_status(struct eap_sm *sm, struct eap_ssl_data *data,
698 char *buf, size_t buflen, int verbose)
703 if (tls_get_cipher(sm->ssl_ctx, data->conn, name, sizeof(name)) == 0) {
704 ret = os_snprintf(buf + len, buflen - len,
705 "EAP TLS cipher=%s\n", name);
706 if (ret < 0 || (size_t) ret >= buflen - len)
716 * eap_peer_tls_process_init - Initial validation/processing of EAP requests
717 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
718 * @data: Data for TLS processing
719 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
720 * @ret: Return values from EAP request validation and processing
721 * @reqData: EAP request to be processed (eapReqData)
722 * @len: Buffer for returning length of the remaining payload
723 * @flags: Buffer for returning TLS flags
724 * Returns: Pointer to payload after TLS flags and length or %NULL on failure
726 * This function validates the EAP header and processes the optional TLS
727 * Message Length field. If this is the first fragment of a TLS message, the
728 * TLS reassembly code is initialized to receive the indicated number of bytes.
730 * EAP-TLS, EAP-PEAP, EAP-TTLS, and EAP-FAST methods are expected to use this
731 * function as the first step in processing received messages. They will need
732 * to process the flags (apart from Message Length Included) that are returned
733 * through the flags pointer and the message payload that will be returned (and
734 * the length is returned through the len pointer). Return values (ret) are set
735 * for continuation of EAP method processing. The caller is responsible for
736 * setting these to indicate completion (either success or failure) based on
737 * the authentication result.
739 const u8 * eap_peer_tls_process_init(struct eap_sm *sm,
740 struct eap_ssl_data *data,
742 struct eap_method_ret *ret,
743 const struct wpabuf *reqData,
744 size_t *len, u8 *flags)
748 unsigned int tls_msg_len;
750 if (tls_get_errors(sm->ssl_ctx)) {
751 wpa_printf(MSG_INFO, "SSL: TLS errors detected");
756 pos = eap_hdr_validate(EAP_VENDOR_IETF, eap_type, reqData, &left);
762 wpa_printf(MSG_DEBUG, "SSL: Invalid TLS message: no Flags "
764 if (!sm->workaround) {
769 wpa_printf(MSG_DEBUG, "SSL: Workaround - assume no Flags "
770 "indicates ACK frame");
776 wpa_printf(MSG_DEBUG, "SSL: Received packet(len=%lu) - "
777 "Flags 0x%02x", (unsigned long) wpabuf_len(reqData),
779 if (*flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) {
781 wpa_printf(MSG_INFO, "SSL: Short frame with TLS "
786 tls_msg_len = WPA_GET_BE32(pos);
787 wpa_printf(MSG_DEBUG, "SSL: TLS Message Length: %d",
789 if (data->tls_in_left == 0) {
790 data->tls_in_total = tls_msg_len;
791 data->tls_in_left = tls_msg_len;
792 wpabuf_free(data->tls_in);
800 ret->methodState = METHOD_MAY_CONT;
801 ret->decision = DECISION_FAIL;
802 ret->allowNotifications = TRUE;
810 * eap_peer_tls_reset_input - Reset input buffers
811 * @data: Data for TLS processing
813 * This function frees any allocated memory for input buffers and resets input
816 void eap_peer_tls_reset_input(struct eap_ssl_data *data)
818 data->tls_in_left = data->tls_in_total = 0;
819 wpabuf_free(data->tls_in);
825 * eap_peer_tls_reset_output - Reset output buffers
826 * @data: Data for TLS processing
828 * This function frees any allocated memory for output buffers and resets
831 void eap_peer_tls_reset_output(struct eap_ssl_data *data)
833 data->tls_out_pos = 0;
834 wpabuf_free(data->tls_out);
835 data->tls_out = NULL;
840 * eap_peer_tls_decrypt - Decrypt received phase 2 TLS message
841 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
842 * @data: Data for TLS processing
843 * @in_data: Message received from the server
844 * @in_decrypted: Buffer for returning a pointer to the decrypted message
845 * Returns: 0 on success, 1 if more input data is needed, or -1 on failure
847 int eap_peer_tls_decrypt(struct eap_sm *sm, struct eap_ssl_data *data,
848 const struct wpabuf *in_data,
849 struct wpabuf **in_decrypted)
851 const struct wpabuf *msg;
854 msg = eap_peer_tls_data_reassemble(data, in_data, &need_more_input);
856 return need_more_input ? 1 : -1;
858 *in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->conn, msg);
859 eap_peer_tls_reset_input(data);
860 if (*in_decrypted == NULL) {
861 wpa_printf(MSG_INFO, "SSL: Failed to decrypt Phase 2 data");
869 * eap_peer_tls_encrypt - Encrypt phase 2 TLS message
870 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
871 * @data: Data for TLS processing
872 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...)
873 * @peap_version: Version number for EAP-PEAP/TTLS
874 * @id: EAP identifier for the response
875 * @in_data: Plaintext phase 2 data to encrypt or %NULL to continue fragments
876 * @out_data: Buffer for returning a pointer to the encrypted response message
877 * Returns: 0 on success, -1 on failure
879 int eap_peer_tls_encrypt(struct eap_sm *sm, struct eap_ssl_data *data,
880 EapType eap_type, int peap_version, u8 id,
881 const struct wpabuf *in_data,
882 struct wpabuf **out_data)
885 eap_peer_tls_reset_output(data);
886 data->tls_out = tls_connection_encrypt(sm->ssl_ctx, data->conn,
888 if (data->tls_out == NULL) {
889 wpa_printf(MSG_INFO, "SSL: Failed to encrypt Phase 2 "
891 (unsigned long) wpabuf_len(in_data));
892 eap_peer_tls_reset_output(data);
897 return eap_tls_process_output(data, eap_type, peap_version, id, 0,
903 * eap_peer_select_phase2_methods - Select phase 2 EAP method
904 * @config: Pointer to the network configuration
905 * @prefix: 'phase2' configuration prefix, e.g., "auth="
906 * @types: Buffer for returning allocated list of allowed EAP methods
907 * @num_types: Buffer for returning number of allocated EAP methods
908 * Returns: 0 on success, -1 on failure
910 * This function is used to parse EAP method list and select allowed methods
911 * for Phase2 authentication.
913 int eap_peer_select_phase2_methods(struct eap_peer_config *config,
915 struct eap_method_type **types,
918 char *start, *pos, *buf;
919 struct eap_method_type *methods = NULL, *_methods;
921 size_t num_methods = 0, prefix_len;
923 if (config == NULL || config->phase2 == NULL)
926 start = buf = os_strdup(config->phase2);
930 prefix_len = os_strlen(prefix);
932 while (start && *start != '\0') {
934 pos = os_strstr(start, prefix);
937 if (start != pos && *(pos - 1) != ' ') {
938 start = pos + prefix_len;
942 start = pos + prefix_len;
943 pos = os_strchr(start, ' ');
946 method = eap_get_phase2_type(start, &vendor);
947 if (vendor == EAP_VENDOR_IETF && method == EAP_TYPE_NONE) {
948 wpa_printf(MSG_ERROR, "TLS: Unsupported Phase2 EAP "
949 "method '%s'", start);
952 _methods = os_realloc(methods,
953 num_methods * sizeof(*methods));
954 if (_methods == NULL) {
960 methods[num_methods - 1].vendor = vendor;
961 methods[num_methods - 1].method = method;
971 methods = eap_get_phase2_types(config, &num_methods);
973 if (methods == NULL) {
974 wpa_printf(MSG_ERROR, "TLS: No Phase2 EAP methods available");
977 wpa_hexdump(MSG_DEBUG, "TLS: Phase2 EAP types",
979 num_methods * sizeof(struct eap_method_type));
982 *num_types = num_methods;
989 * eap_peer_tls_phase2_nak - Generate EAP-Nak for Phase 2
990 * @types: Buffer for returning allocated list of allowed EAP methods
991 * @num_types: Buffer for returning number of allocated EAP methods
992 * @hdr: EAP-Request header (and the following EAP type octet)
993 * @resp: Buffer for returning the EAP-Nak message
994 * Returns: 0 on success, -1 on failure
996 int eap_peer_tls_phase2_nak(struct eap_method_type *types, size_t num_types,
997 struct eap_hdr *hdr, struct wpabuf **resp)
999 u8 *pos = (u8 *) (hdr + 1);
1002 /* TODO: add support for expanded Nak */
1003 wpa_printf(MSG_DEBUG, "TLS: Phase 2 Request: Nak type=%d", *pos);
1004 wpa_hexdump(MSG_DEBUG, "TLS: Allowed Phase2 EAP types",
1005 (u8 *) types, num_types * sizeof(struct eap_method_type));
1006 *resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_NAK, num_types,
1007 EAP_CODE_RESPONSE, hdr->identifier);
1011 for (i = 0; i < num_types; i++) {
1012 if (types[i].vendor == EAP_VENDOR_IETF &&
1013 types[i].method < 256)
1014 wpabuf_put_u8(*resp, types[i].method);
1017 eap_update_len(*resp);