1/* 2 * EAP peer: EAP-TLS/PEAP/TTLS/FAST common functions 3 * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi> 4 * 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. 8 * 9 * Alternatively, this software may be distributed under the terms of BSD 10 * license. 11 * 12 * See README and COPYING for more details. 13 */ 14 15#include "includes.h" 16 17#include "common.h" 18#include "crypto/sha1.h" 19#include "crypto/tls.h" 20#include "eap_i.h" 21#include "eap_tls_common.h" 22#include "eap_config.h" 23 24 25static int eap_tls_check_blob(struct eap_sm *sm, const char **name, 26 const u8 **data, size_t *data_len) 27{ 28 const struct wpa_config_blob *blob; 29 30 if (*name == NULL || os_strncmp(*name, "blob://", 7) != 0) 31 return 0; 32 33 blob = eap_get_config_blob(sm, *name + 7); 34 if (blob == NULL) { 35 wpa_printf(MSG_ERROR, "%s: Named configuration blob '%s' not " 36 "found", __func__, *name + 7); 37 return -1; 38 } 39 40 *name = NULL; 41 *data = blob->data; 42 *data_len = blob->len; 43 44 return 0; 45} 46 47 48static void eap_tls_params_flags(struct tls_connection_params *params, 49 const char *txt) 50{ 51 if (txt == NULL) 52 return; 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; 57} 58 59 60static void eap_tls_params_from_conf1(struct tls_connection_params *params, 61 struct eap_peer_config *config) 62{ 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); 78} 79 80 81static void eap_tls_params_from_conf2(struct tls_connection_params *params, 82 struct eap_peer_config *config) 83{ 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); 99} 100 101 102static 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) 106{ 107 os_memset(params, 0, sizeof(*params)); 108 if (phase2) { 109 wpa_printf(MSG_DEBUG, "TLS: using phase2 config options"); 110 eap_tls_params_from_conf2(params, config); 111 } else { 112 wpa_printf(MSG_DEBUG, "TLS: using phase1 config options"); 113 eap_tls_params_from_conf1(params, config); 114 } 115 params->tls_ia = data->tls_ia; 116 117 /* 118 * Use blob data, if available. Otherwise, leave reference to external 119 * file as-is. 120 */ 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"); 132 return -1; 133 } 134 135 return 0; 136} 137 138 139static 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) 143{ 144 int res; 145 146 data->conn = tls_connection_init(sm->ssl_ctx); 147 if (data->conn == NULL) { 148 wpa_printf(MSG_INFO, "SSL: Failed to initialize new TLS " 149 "connection"); 150 return -1; 151 } 152 153 res = tls_connection_set_params(sm->ssl_ctx, data->conn, params); 154 if (res == TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED) { 155 /* 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. 159 */ 160 os_free(config->pin); 161 config->pin = NULL; 162 } else if (res == TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED) { 163 wpa_printf(MSG_INFO, "TLS: Failed to load private key"); 164 /* 165 * We do not know exactly but maybe the PIN was wrong, 166 * so ask for a new one. 167 */ 168 os_free(config->pin); 169 config->pin = NULL; 170 eap_sm_request_pin(sm); 171 sm->ignore = TRUE; 172 tls_connection_deinit(sm->ssl_ctx, data->conn); 173 data->conn = NULL; 174 return -1; 175 } else if (res) { 176 wpa_printf(MSG_INFO, "TLS: Failed to set TLS connection " 177 "parameters"); 178 tls_connection_deinit(sm->ssl_ctx, data->conn); 179 data->conn = NULL; 180 return -1; 181 } 182 183 return 0; 184} 185 186 187/** 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 193 * 194 * This function is used to initialize shared TLS functionality for EAP-TLS, 195 * EAP-PEAP, EAP-TTLS, and EAP-FAST. 196 */ 197int eap_peer_tls_ssl_init(struct eap_sm *sm, struct eap_ssl_data *data, 198 struct eap_peer_config *config) 199{ 200 struct tls_connection_params params; 201 202 if (config == NULL) 203 return -1; 204 205 data->eap = sm; 206 data->phase2 = sm->init_phase2; 207 if (eap_tls_params_from_conf(sm, data, ¶ms, config, data->phase2) < 208 0) 209 return -1; 210 211 if (eap_tls_init_connection(sm, data, config, ¶ms) < 0) 212 return -1; 213 214 data->tls_out_limit = config->fragment_size; 215 if (data->phase2) { 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; 221 } 222 223 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; 228 } 229 230 return 0; 231} 232 233 234/** 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 238 * 239 * This function deinitializes shared TLS functionality that was initialized 240 * with eap_peer_tls_ssl_init(). 241 */ 242void eap_peer_tls_ssl_deinit(struct eap_sm *sm, struct eap_ssl_data *data) 243{ 244 tls_connection_deinit(sm->ssl_ctx, data->conn); 245 eap_peer_tls_reset_input(data); 246 eap_peer_tls_reset_output(data); 247} 248 249 250/** 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 257 * 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. 261 * 262 * The caller is responsible for freeing the returned buffer. 263 */ 264u8 * eap_peer_tls_derive_key(struct eap_sm *sm, struct eap_ssl_data *data, 265 const char *label, size_t len) 266{ 267 struct tls_keys keys; 268 u8 *rnd = NULL, *out; 269 270 out = os_malloc(len); 271 if (out == NULL) 272 return NULL; 273 274 /* 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) == 276 0) 277 return out; 278 279 /* 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 282 * derive the key. 283 */ 284 if (tls_connection_get_keys(sm->ssl_ctx, data->conn, &keys)) 285 goto fail; 286 287 if (keys.client_random == NULL || keys.server_random == NULL || 288 keys.master_key == NULL) 289 goto fail; 290 291 rnd = os_malloc(keys.client_random_len + keys.server_random_len); 292 if (rnd == NULL) 293 goto fail; 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); 297 298 if (tls_prf(keys.master_key, keys.master_key_len, 299 label, rnd, keys.client_random_len + 300 keys.server_random_len, out, len)) 301 goto fail; 302 303 os_free(rnd); 304 return out; 305 306fail: 307 os_free(out); 308 os_free(rnd); 309 return NULL; 310} 311 312 313/** 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 318 * -1 on error 319 */ 320static int eap_peer_tls_reassemble_fragment(struct eap_ssl_data *data, 321 const struct wpabuf *in_data) 322{ 323 size_t tls_in_len, in_len; 324 325 tls_in_len = data->tls_in ? wpabuf_len(data->tls_in) : 0; 326 in_len = in_data ? wpabuf_len(in_data) : 0; 327 328 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); 336 return -1; 337 } 338 339 if (tls_in_len + in_len > 65536) { 340 /* 341 * Limit length to avoid rogue servers from causing large 342 * memory allocations. 343 */ 344 wpa_printf(MSG_INFO, "SSL: Too long TLS fragment (size over " 345 "64 kB)"); 346 eap_peer_tls_reset_input(data); 347 return -1; 348 } 349 350 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 " 353 "indicated"); 354 eap_peer_tls_reset_input(data); 355 return -1; 356 } 357 358 if (wpabuf_resize(&data->tls_in, in_len) < 0) { 359 wpa_printf(MSG_INFO, "SSL: Could not allocate memory for TLS " 360 "data"); 361 eap_peer_tls_reset_input(data); 362 return -1; 363 } 364 if (in_data) 365 wpabuf_put_buf(data->tls_in, in_data); 366 data->tls_in_left -= in_len; 367 368 if (data->tls_in_left > 0) { 369 wpa_printf(MSG_DEBUG, "SSL: Need %lu bytes more input " 370 "data", (unsigned long) data->tls_in_left); 371 return 1; 372 } 373 374 return 0; 375} 376 377 378/** 379 * eap_peer_tls_data_reassemble - Reassemble TLS data 380 * @data: Data for TLS processing 381 * @in_data: Next incoming TLS segment 382 * @need_more_input: Variable for returning whether more input data is needed 383 * to reassemble this TLS packet 384 * Returns: Pointer to output data, %NULL on error or when more data is needed 385 * for the full message (in which case, *need_more_input is also set to 1). 386 * 387 * This function reassembles TLS fragments. Caller must not free the returned 388 * data buffer since an internal pointer to it is maintained. 389 */ 390static const struct wpabuf * eap_peer_tls_data_reassemble( 391 struct eap_ssl_data *data, const struct wpabuf *in_data, 392 int *need_more_input) 393{ 394 *need_more_input = 0; 395 396 if (data->tls_in_left > wpabuf_len(in_data) || data->tls_in) { 397 /* Message has fragments */ 398 int res = eap_peer_tls_reassemble_fragment(data, in_data); 399 if (res) { 400 if (res == 1) 401 *need_more_input = 1; 402 return NULL; 403 } 404 405 /* Message is now fully reassembled. */ 406 } else { 407 /* No fragments in this message, so just make a copy of it. */ 408 data->tls_in_left = 0; 409 data->tls_in = wpabuf_dup(in_data); 410 if (data->tls_in == NULL) 411 return NULL; 412 } 413 414 return data->tls_in; 415} 416 417 418/** 419 * eap_tls_process_input - Process incoming TLS message 420 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() 421 * @data: Data for TLS processing 422 * @in_data: Message received from the server 423 * @in_len: Length of in_data 424 * @out_data: Buffer for returning a pointer to application data (if available) 425 * Returns: 0 on success, 1 if more input data is needed, 2 if application data 426 * is available, -1 on failure 427 */ 428static int eap_tls_process_input(struct eap_sm *sm, struct eap_ssl_data *data, 429 const u8 *in_data, size_t in_len, 430 struct wpabuf **out_data) 431{ 432 const struct wpabuf *msg; 433 int need_more_input; 434 struct wpabuf *appl_data; 435 struct wpabuf buf; 436 437 wpabuf_set(&buf, in_data, in_len); 438 msg = eap_peer_tls_data_reassemble(data, &buf, &need_more_input); 439 if (msg == NULL) 440 return need_more_input ? 1 : -1; 441 442 /* Full TLS message reassembled - continue handshake processing */ 443 if (data->tls_out) { 444 /* This should not happen.. */ 445 wpa_printf(MSG_INFO, "SSL: eap_tls_process_input - pending " 446 "tls_out data even though tls_out_len = 0"); 447 wpabuf_free(data->tls_out); 448 WPA_ASSERT(data->tls_out == NULL); 449 } 450 appl_data = NULL; 451 data->tls_out = tls_connection_handshake(sm->ssl_ctx, data->conn, 452 msg, &appl_data); 453 454 eap_peer_tls_reset_input(data); 455 456 if (appl_data && 457 tls_connection_established(sm->ssl_ctx, data->conn) && 458 !tls_connection_get_failed(sm->ssl_ctx, data->conn)) { 459 wpa_hexdump_buf_key(MSG_MSGDUMP, "SSL: Application data", 460 appl_data); 461 *out_data = appl_data; 462 return 2; 463 } 464 465 wpabuf_free(appl_data); 466 467 return 0; 468} 469 470 471/** 472 * eap_tls_process_output - Process outgoing TLS message 473 * @data: Data for TLS processing 474 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...) 475 * @peap_version: Version number for EAP-PEAP/TTLS 476 * @id: EAP identifier for the response 477 * @ret: Return value to use on success 478 * @out_data: Buffer for returning the allocated output buffer 479 * Returns: ret (0 or 1) on success, -1 on failure 480 */ 481static int eap_tls_process_output(struct eap_ssl_data *data, EapType eap_type, 482 int peap_version, u8 id, int ret, 483 struct wpabuf **out_data) 484{ 485 size_t len; 486 u8 *flags; 487 int more_fragments, length_included; 488 489 if (data->tls_out == NULL) 490 return -1; 491 len = wpabuf_len(data->tls_out) - data->tls_out_pos; 492 wpa_printf(MSG_DEBUG, "SSL: %lu bytes left to be sent out (of total " 493 "%lu bytes)", 494 (unsigned long) len, 495 (unsigned long) wpabuf_len(data->tls_out)); 496 497 /* 498 * Limit outgoing message to the configured maximum size. Fragment 499 * message if needed. 500 */ 501 if (len > data->tls_out_limit) { 502 more_fragments = 1; 503 len = data->tls_out_limit; 504 wpa_printf(MSG_DEBUG, "SSL: sending %lu bytes, more fragments " 505 "will follow", (unsigned long) len); 506 } else 507 more_fragments = 0; 508 509 length_included = data->tls_out_pos == 0 && 510 (wpabuf_len(data->tls_out) > data->tls_out_limit || 511 data->include_tls_length); 512 if (!length_included && 513 eap_type == EAP_TYPE_PEAP && peap_version == 0 && 514 !tls_connection_established(data->eap->ssl_ctx, data->conn)) { 515 /* 516 * Windows Server 2008 NPS really wants to have the TLS Message 517 * length included in phase 0 even for unfragmented frames or 518 * it will get very confused with Compound MAC calculation and 519 * Outer TLVs. 520 */ 521 length_included = 1; 522 } 523 524 *out_data = eap_msg_alloc(EAP_VENDOR_IETF, eap_type, 525 1 + length_included * 4 + len, 526 EAP_CODE_RESPONSE, id); 527 if (*out_data == NULL) 528 return -1; 529 530 flags = wpabuf_put(*out_data, 1); 531 *flags = peap_version; 532 if (more_fragments) 533 *flags |= EAP_TLS_FLAGS_MORE_FRAGMENTS; 534 if (length_included) { 535 *flags |= EAP_TLS_FLAGS_LENGTH_INCLUDED; 536 wpabuf_put_be32(*out_data, wpabuf_len(data->tls_out)); 537 } 538 539 wpabuf_put_data(*out_data, 540 wpabuf_head_u8(data->tls_out) + data->tls_out_pos, 541 len); 542 data->tls_out_pos += len; 543 544 if (!more_fragments) 545 eap_peer_tls_reset_output(data); 546 547 return ret; 548} 549 550 551/** 552 * eap_peer_tls_process_helper - Process TLS handshake message 553 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() 554 * @data: Data for TLS processing 555 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...) 556 * @peap_version: Version number for EAP-PEAP/TTLS 557 * @id: EAP identifier for the response 558 * @in_data: Message received from the server 559 * @in_len: Length of in_data 560 * @out_data: Buffer for returning a pointer to the response message 561 * Returns: 0 on success, 1 if more input data is needed, 2 if application data 562 * is available, or -1 on failure 563 * 564 * This function can be used to process TLS handshake messages. It reassembles 565 * the received fragments and uses a TLS library to process the messages. The 566 * response data from the TLS library is fragmented to suitable output messages 567 * that the caller can send out. 568 * 569 * out_data is used to return the response message if the return value of this 570 * function is 0, 2, or -1. In case of failure, the message is likely a TLS 571 * alarm message. The caller is responsible for freeing the allocated buffer if 572 * *out_data is not %NULL. 573 * 574 * This function is called for each received TLS message during the TLS 575 * handshake after eap_peer_tls_process_init() call and possible processing of 576 * TLS Flags field. Once the handshake has been completed, i.e., when 577 * tls_connection_established() returns 1, EAP method specific decrypting of 578 * the tunneled data is used. 579 */ 580int eap_peer_tls_process_helper(struct eap_sm *sm, struct eap_ssl_data *data, 581 EapType eap_type, int peap_version, 582 u8 id, const u8 *in_data, size_t in_len, 583 struct wpabuf **out_data) 584{ 585 int ret = 0; 586 587 *out_data = NULL; 588 589 if (data->tls_out && wpabuf_len(data->tls_out) > 0 && in_len > 0) { 590 wpa_printf(MSG_DEBUG, "SSL: Received non-ACK when output " 591 "fragments are waiting to be sent out"); 592 return -1; 593 } 594 595 if (data->tls_out == NULL || wpabuf_len(data->tls_out) == 0) { 596 /* 597 * No more data to send out - expect to receive more data from 598 * the AS. 599 */ 600 int res = eap_tls_process_input(sm, data, in_data, in_len, 601 out_data); 602 if (res) { 603 /* 604 * Input processing failed (res = -1) or more data is 605 * needed (res = 1). 606 */ 607 return res; 608 } 609 610 /* 611 * The incoming message has been reassembled and processed. The 612 * response was allocated into data->tls_out buffer. 613 */ 614 } 615 616 if (data->tls_out == NULL) { 617 /* 618 * No outgoing fragments remaining from the previous message 619 * and no new message generated. This indicates an error in TLS 620 * processing. 621 */ 622 eap_peer_tls_reset_output(data); 623 return -1; 624 } 625 626 if (tls_connection_get_failed(sm->ssl_ctx, data->conn)) { 627 /* TLS processing has failed - return error */ 628 wpa_printf(MSG_DEBUG, "SSL: Failed - tls_out available to " 629 "report error"); 630 ret = -1; 631 /* TODO: clean pin if engine used? */ 632 } 633 634 if (data->tls_out == NULL || wpabuf_len(data->tls_out) == 0) { 635 /* 636 * TLS negotiation should now be complete since all other cases 637 * needing more data should have been caught above based on 638 * the TLS Message Length field. 639 */ 640 wpa_printf(MSG_DEBUG, "SSL: No data to be sent out"); 641 wpabuf_free(data->tls_out); 642 data->tls_out = NULL; 643 return 1; 644 } 645 646 /* Send the pending message (in fragments, if needed). */ 647 return eap_tls_process_output(data, eap_type, peap_version, id, ret, 648 out_data); 649} 650 651 652/** 653 * eap_peer_tls_build_ack - Build a TLS ACK frame 654 * @id: EAP identifier for the response 655 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...) 656 * @peap_version: Version number for EAP-PEAP/TTLS 657 * Returns: Pointer to the allocated ACK frame or %NULL on failure 658 */ 659struct wpabuf * eap_peer_tls_build_ack(u8 id, EapType eap_type, 660 int peap_version) 661{ 662 struct wpabuf *resp; 663 664 resp = eap_msg_alloc(EAP_VENDOR_IETF, eap_type, 1, EAP_CODE_RESPONSE, 665 id); 666 if (resp == NULL) 667 return NULL; 668 wpa_printf(MSG_DEBUG, "SSL: Building ACK (type=%d id=%d ver=%d)", 669 (int) eap_type, id, peap_version); 670 wpabuf_put_u8(resp, peap_version); /* Flags */ 671 return resp; 672} 673 674 675/** 676 * eap_peer_tls_reauth_init - Re-initialize shared TLS for session resumption 677 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() 678 * @data: Data for TLS processing 679 * Returns: 0 on success, -1 on failure 680 */ 681int eap_peer_tls_reauth_init(struct eap_sm *sm, struct eap_ssl_data *data) 682{ 683 eap_peer_tls_reset_input(data); 684 eap_peer_tls_reset_output(data); 685 return tls_connection_shutdown(sm->ssl_ctx, data->conn); 686} 687 688 689/** 690 * eap_peer_tls_status - Get TLS status 691 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() 692 * @data: Data for TLS processing 693 * @buf: Buffer for status information 694 * @buflen: Maximum buffer length 695 * @verbose: Whether to include verbose status information 696 * Returns: Number of bytes written to buf. 697 */ 698int eap_peer_tls_status(struct eap_sm *sm, struct eap_ssl_data *data, 699 char *buf, size_t buflen, int verbose) 700{ 701 char name[128]; 702 int len = 0, ret; 703 704 if (tls_get_cipher(sm->ssl_ctx, data->conn, name, sizeof(name)) == 0) { 705 ret = os_snprintf(buf + len, buflen - len, 706 "EAP TLS cipher=%s\n", name); 707 if (ret < 0 || (size_t) ret >= buflen - len) 708 return len; 709 len += ret; 710 } 711 712 return len; 713} 714 715 716/** 717 * eap_peer_tls_process_init - Initial validation/processing of EAP requests 718 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() 719 * @data: Data for TLS processing 720 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...) 721 * @ret: Return values from EAP request validation and processing 722 * @reqData: EAP request to be processed (eapReqData) 723 * @len: Buffer for returning length of the remaining payload 724 * @flags: Buffer for returning TLS flags 725 * Returns: Pointer to payload after TLS flags and length or %NULL on failure 726 * 727 * This function validates the EAP header and processes the optional TLS 728 * Message Length field. If this is the first fragment of a TLS message, the 729 * TLS reassembly code is initialized to receive the indicated number of bytes. 730 * 731 * EAP-TLS, EAP-PEAP, EAP-TTLS, and EAP-FAST methods are expected to use this 732 * function as the first step in processing received messages. They will need 733 * to process the flags (apart from Message Length Included) that are returned 734 * through the flags pointer and the message payload that will be returned (and 735 * the length is returned through the len pointer). Return values (ret) are set 736 * for continuation of EAP method processing. The caller is responsible for 737 * setting these to indicate completion (either success or failure) based on 738 * the authentication result. 739 */ 740const u8 * eap_peer_tls_process_init(struct eap_sm *sm, 741 struct eap_ssl_data *data, 742 EapType eap_type, 743 struct eap_method_ret *ret, 744 const struct wpabuf *reqData, 745 size_t *len, u8 *flags) 746{ 747 const u8 *pos; 748 size_t left; 749 unsigned int tls_msg_len; 750 751 if (tls_get_errors(sm->ssl_ctx)) { 752 wpa_printf(MSG_INFO, "SSL: TLS errors detected"); 753 ret->ignore = TRUE; 754 return NULL; 755 } 756 757 pos = eap_hdr_validate(EAP_VENDOR_IETF, eap_type, reqData, &left); 758 if (pos == NULL) { 759 ret->ignore = TRUE; 760 return NULL; 761 } 762 if (left == 0) { 763 wpa_printf(MSG_DEBUG, "SSL: Invalid TLS message: no Flags " 764 "octet included"); 765 if (!sm->workaround) { 766 ret->ignore = TRUE; 767 return NULL; 768 } 769 770 wpa_printf(MSG_DEBUG, "SSL: Workaround - assume no Flags " 771 "indicates ACK frame"); 772 *flags = 0; 773 } else { 774 *flags = *pos++; 775 left--; 776 } 777 wpa_printf(MSG_DEBUG, "SSL: Received packet(len=%lu) - " 778 "Flags 0x%02x", (unsigned long) wpabuf_len(reqData), 779 *flags); 780 if (*flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) { 781 if (left < 4) { 782 wpa_printf(MSG_INFO, "SSL: Short frame with TLS " 783 "length"); 784 ret->ignore = TRUE; 785 return NULL; 786 } 787 tls_msg_len = WPA_GET_BE32(pos); 788 wpa_printf(MSG_DEBUG, "SSL: TLS Message Length: %d", 789 tls_msg_len); 790 if (data->tls_in_left == 0) { 791 data->tls_in_total = tls_msg_len; 792 data->tls_in_left = tls_msg_len; 793 wpabuf_free(data->tls_in); 794 data->tls_in = NULL; 795 } 796 pos += 4; 797 left -= 4; 798 } 799 800 ret->ignore = FALSE; 801 ret->methodState = METHOD_MAY_CONT; 802 ret->decision = DECISION_FAIL; 803 ret->allowNotifications = TRUE; 804 805 *len = left; 806 return pos; 807} 808 809 810/** 811 * eap_peer_tls_reset_input - Reset input buffers 812 * @data: Data for TLS processing 813 * 814 * This function frees any allocated memory for input buffers and resets input 815 * state. 816 */ 817void eap_peer_tls_reset_input(struct eap_ssl_data *data) 818{ 819 data->tls_in_left = data->tls_in_total = 0; 820 wpabuf_free(data->tls_in); 821 data->tls_in = NULL; 822} 823 824 825/** 826 * eap_peer_tls_reset_output - Reset output buffers 827 * @data: Data for TLS processing 828 * 829 * This function frees any allocated memory for output buffers and resets 830 * output state. 831 */ 832void eap_peer_tls_reset_output(struct eap_ssl_data *data) 833{ 834 data->tls_out_pos = 0; 835 wpabuf_free(data->tls_out); 836 data->tls_out = NULL; 837} 838 839 840/** 841 * eap_peer_tls_decrypt - Decrypt received phase 2 TLS message 842 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() 843 * @data: Data for TLS processing 844 * @in_data: Message received from the server 845 * @in_decrypted: Buffer for returning a pointer to the decrypted message 846 * Returns: 0 on success, 1 if more input data is needed, or -1 on failure 847 */ 848int eap_peer_tls_decrypt(struct eap_sm *sm, struct eap_ssl_data *data, 849 const struct wpabuf *in_data, 850 struct wpabuf **in_decrypted) 851{ 852 const struct wpabuf *msg; 853 int need_more_input; 854 855 msg = eap_peer_tls_data_reassemble(data, in_data, &need_more_input); 856 if (msg == NULL) 857 return need_more_input ? 1 : -1; 858 859 *in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->conn, msg); 860 eap_peer_tls_reset_input(data); 861 if (*in_decrypted == NULL) { 862 wpa_printf(MSG_INFO, "SSL: Failed to decrypt Phase 2 data"); 863 return -1; 864 } 865 return 0; 866} 867 868 869/** 870 * eap_peer_tls_encrypt - Encrypt phase 2 TLS message 871 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() 872 * @data: Data for TLS processing 873 * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...) 874 * @peap_version: Version number for EAP-PEAP/TTLS 875 * @id: EAP identifier for the response 876 * @in_data: Plaintext phase 2 data to encrypt or %NULL to continue fragments 877 * @out_data: Buffer for returning a pointer to the encrypted response message 878 * Returns: 0 on success, -1 on failure 879 */ 880int eap_peer_tls_encrypt(struct eap_sm *sm, struct eap_ssl_data *data, 881 EapType eap_type, int peap_version, u8 id, 882 const struct wpabuf *in_data, 883 struct wpabuf **out_data) 884{ 885 if (in_data) { 886 eap_peer_tls_reset_output(data); 887 data->tls_out = tls_connection_encrypt(sm->ssl_ctx, data->conn, 888 in_data); 889 if (data->tls_out == NULL) { 890 wpa_printf(MSG_INFO, "SSL: Failed to encrypt Phase 2 " 891 "data (in_len=%lu)", 892 (unsigned long) wpabuf_len(in_data)); 893 eap_peer_tls_reset_output(data); 894 return -1; 895 } 896 } 897 898 return eap_tls_process_output(data, eap_type, peap_version, id, 0, 899 out_data); 900} 901 902 903/** 904 * eap_peer_select_phase2_methods - Select phase 2 EAP method 905 * @config: Pointer to the network configuration 906 * @prefix: 'phase2' configuration prefix, e.g., "auth=" 907 * @types: Buffer for returning allocated list of allowed EAP methods 908 * @num_types: Buffer for returning number of allocated EAP methods 909 * Returns: 0 on success, -1 on failure 910 * 911 * This function is used to parse EAP method list and select allowed methods 912 * for Phase2 authentication. 913 */ 914int eap_peer_select_phase2_methods(struct eap_peer_config *config, 915 const char *prefix, 916 struct eap_method_type **types, 917 size_t *num_types) 918{ 919 char *start, *pos, *buf; 920 struct eap_method_type *methods = NULL, *_methods; 921 u8 method; 922 size_t num_methods = 0, prefix_len; 923 924 if (config == NULL || config->phase2 == NULL) 925 goto get_defaults; 926 927 start = buf = os_strdup(config->phase2); 928 if (buf == NULL) 929 return -1; 930 931 prefix_len = os_strlen(prefix); 932 933 while (start && *start != '\0') { 934 int vendor; 935 pos = os_strstr(start, prefix); 936 if (pos == NULL) 937 break; 938 if (start != pos && *(pos - 1) != ' ') { 939 start = pos + prefix_len; 940 continue; 941 } 942 943 start = pos + prefix_len; 944 pos = os_strchr(start, ' '); 945 if (pos) 946 *pos++ = '\0'; 947 method = eap_get_phase2_type(start, &vendor); 948 if (vendor == EAP_VENDOR_IETF && method == EAP_TYPE_NONE) { 949 wpa_printf(MSG_ERROR, "TLS: Unsupported Phase2 EAP " 950 "method '%s'", start); 951 } else { 952 num_methods++; 953 _methods = os_realloc(methods, 954 num_methods * sizeof(*methods)); 955 if (_methods == NULL) { 956 os_free(methods); 957 os_free(buf); 958 return -1; 959 } 960 methods = _methods; 961 methods[num_methods - 1].vendor = vendor; 962 methods[num_methods - 1].method = method; 963 } 964 965 start = pos; 966 } 967 968 os_free(buf); 969 970get_defaults: 971 if (methods == NULL) 972 methods = eap_get_phase2_types(config, &num_methods); 973 974 if (methods == NULL) { 975 wpa_printf(MSG_ERROR, "TLS: No Phase2 EAP methods available"); 976 return -1; 977 } 978 wpa_hexdump(MSG_DEBUG, "TLS: Phase2 EAP types", 979 (u8 *) methods, 980 num_methods * sizeof(struct eap_method_type)); 981 982 *types = methods; 983 *num_types = num_methods; 984 985 return 0; 986} 987 988 989/** 990 * eap_peer_tls_phase2_nak - Generate EAP-Nak for Phase 2 991 * @types: Buffer for returning allocated list of allowed EAP methods 992 * @num_types: Buffer for returning number of allocated EAP methods 993 * @hdr: EAP-Request header (and the following EAP type octet) 994 * @resp: Buffer for returning the EAP-Nak message 995 * Returns: 0 on success, -1 on failure 996 */ 997int eap_peer_tls_phase2_nak(struct eap_method_type *types, size_t num_types, 998 struct eap_hdr *hdr, struct wpabuf **resp) 999{ 1000 u8 *pos = (u8 *) (hdr + 1); 1001 size_t i; 1002 1003 /* TODO: add support for expanded Nak */ 1004 wpa_printf(MSG_DEBUG, "TLS: Phase 2 Request: Nak type=%d", *pos); 1005 wpa_hexdump(MSG_DEBUG, "TLS: Allowed Phase2 EAP types", 1006 (u8 *) types, num_types * sizeof(struct eap_method_type)); 1007 *resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_NAK, num_types, 1008 EAP_CODE_RESPONSE, hdr->identifier); 1009 if (*resp == NULL) 1010 return -1; 1011 1012 for (i = 0; i < num_types; i++) { 1013 if (types[i].vendor == EAP_VENDOR_IETF && 1014 types[i].method < 256) 1015 wpabuf_put_u8(*resp, types[i].method); 1016 } 1017 1018 eap_update_len(*resp); 1019 1020 return 0; 1021} 1022