1 /* 2 * EAP peer method: EAP-PEAP (draft-josefsson-pppext-eap-tls-eap-10.txt) 3 * Copyright (c) 2004-2019, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "includes.h" 10 11 #include "common.h" 12 #include "crypto/sha1.h" 13 #include "crypto/tls.h" 14 #include "eap_common/eap_tlv_common.h" 15 #include "eap_common/eap_peap_common.h" 16 #include "eap_i.h" 17 #include "eap_tls_common.h" 18 #include "eap_config.h" 19 #include "tncc.h" 20 21 22 /* Maximum supported PEAP version 23 * 0 = Microsoft's PEAP version 0; draft-kamath-pppext-peapv0-00.txt 24 * 1 = draft-josefsson-ppext-eap-tls-eap-05.txt 25 */ 26 #define EAP_PEAP_VERSION 1 27 28 29 static void eap_peap_deinit(struct eap_sm *sm, void *priv); 30 31 32 struct eap_peap_data { 33 struct eap_ssl_data ssl; 34 35 int peap_version, force_peap_version, force_new_label; 36 37 const struct eap_method *phase2_method; 38 void *phase2_priv; 39 int phase2_success; 40 int phase2_eap_success; 41 int phase2_eap_started; 42 43 struct eap_method_type phase2_type; 44 struct eap_method_type *phase2_types; 45 size_t num_phase2_types; 46 47 int peap_outer_success; /* 0 = PEAP terminated on Phase 2 inner 48 * EAP-Success 49 * 1 = reply with tunneled EAP-Success to inner 50 * EAP-Success and expect AS to send outer 51 * (unencrypted) EAP-Success after this 52 * 2 = reply with PEAP/TLS ACK to inner 53 * EAP-Success and expect AS to send outer 54 * (unencrypted) EAP-Success after this */ 55 int resuming; /* starting a resumed session */ 56 int reauth; /* reauthentication */ 57 u8 *key_data; 58 u8 *session_id; 59 size_t id_len; 60 61 struct wpabuf *pending_phase2_req; 62 struct wpabuf *pending_resp; 63 enum { NO_BINDING, OPTIONAL_BINDING, REQUIRE_BINDING } crypto_binding; 64 int crypto_binding_used; 65 u8 binding_nonce[32]; 66 u8 ipmk[40]; 67 u8 cmk[20]; 68 int soh; /* Whether IF-TNCCS-SOH (Statement of Health; Microsoft NAP) 69 * is enabled. */ 70 }; 71 72 73 static void eap_peap_parse_phase1(struct eap_peap_data *data, 74 const char *phase1) 75 { 76 const char *pos; 77 78 pos = os_strstr(phase1, "peapver="); 79 if (pos) { 80 data->force_peap_version = atoi(pos + 8); 81 data->peap_version = data->force_peap_version; 82 wpa_printf(MSG_DEBUG, "EAP-PEAP: Forced PEAP version %d", 83 data->force_peap_version); 84 } 85 86 if (os_strstr(phase1, "peaplabel=1")) { 87 data->force_new_label = 1; 88 wpa_printf(MSG_DEBUG, "EAP-PEAP: Force new label for key " 89 "derivation"); 90 } 91 92 if (os_strstr(phase1, "peap_outer_success=0")) { 93 data->peap_outer_success = 0; 94 wpa_printf(MSG_DEBUG, "EAP-PEAP: terminate authentication on " 95 "tunneled EAP-Success"); 96 } else if (os_strstr(phase1, "peap_outer_success=1")) { 97 data->peap_outer_success = 1; 98 wpa_printf(MSG_DEBUG, "EAP-PEAP: send tunneled EAP-Success " 99 "after receiving tunneled EAP-Success"); 100 } else if (os_strstr(phase1, "peap_outer_success=2")) { 101 data->peap_outer_success = 2; 102 wpa_printf(MSG_DEBUG, "EAP-PEAP: send PEAP/TLS ACK after " 103 "receiving tunneled EAP-Success"); 104 } 105 106 if (os_strstr(phase1, "crypto_binding=0")) { 107 data->crypto_binding = NO_BINDING; 108 wpa_printf(MSG_DEBUG, "EAP-PEAP: Do not use cryptobinding"); 109 } else if (os_strstr(phase1, "crypto_binding=1")) { 110 data->crypto_binding = OPTIONAL_BINDING; 111 wpa_printf(MSG_DEBUG, "EAP-PEAP: Optional cryptobinding"); 112 } else if (os_strstr(phase1, "crypto_binding=2")) { 113 data->crypto_binding = REQUIRE_BINDING; 114 wpa_printf(MSG_DEBUG, "EAP-PEAP: Require cryptobinding"); 115 } 116 117 #ifdef EAP_TNC 118 if (os_strstr(phase1, "tnc=soh2")) { 119 data->soh = 2; 120 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled"); 121 } else if (os_strstr(phase1, "tnc=soh1")) { 122 data->soh = 1; 123 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 1 enabled"); 124 } else if (os_strstr(phase1, "tnc=soh")) { 125 data->soh = 2; 126 wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled"); 127 } 128 #endif /* EAP_TNC */ 129 } 130 131 132 static void * eap_peap_init(struct eap_sm *sm) 133 { 134 struct eap_peap_data *data; 135 struct eap_peer_config *config = eap_get_config(sm); 136 137 data = os_zalloc(sizeof(*data)); 138 if (data == NULL) 139 return NULL; 140 sm->peap_done = FALSE; 141 data->peap_version = EAP_PEAP_VERSION; 142 data->force_peap_version = -1; 143 data->peap_outer_success = 2; 144 data->crypto_binding = OPTIONAL_BINDING; 145 146 if (config && config->phase1) 147 eap_peap_parse_phase1(data, config->phase1); 148 149 if (eap_peer_select_phase2_methods(config, "auth=", 150 &data->phase2_types, 151 &data->num_phase2_types) < 0) { 152 eap_peap_deinit(sm, data); 153 return NULL; 154 } 155 156 data->phase2_type.vendor = EAP_VENDOR_IETF; 157 data->phase2_type.method = EAP_TYPE_NONE; 158 159 if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_PEAP)) { 160 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to initialize SSL."); 161 eap_peap_deinit(sm, data); 162 return NULL; 163 } 164 165 return data; 166 } 167 168 169 static void eap_peap_free_key(struct eap_peap_data *data) 170 { 171 if (data->key_data) { 172 bin_clear_free(data->key_data, EAP_TLS_KEY_LEN + EAP_EMSK_LEN); 173 data->key_data = NULL; 174 } 175 } 176 177 178 static void eap_peap_deinit(struct eap_sm *sm, void *priv) 179 { 180 struct eap_peap_data *data = priv; 181 if (data == NULL) 182 return; 183 if (data->phase2_priv && data->phase2_method) 184 data->phase2_method->deinit(sm, data->phase2_priv); 185 os_free(data->phase2_types); 186 eap_peer_tls_ssl_deinit(sm, &data->ssl); 187 eap_peap_free_key(data); 188 os_free(data->session_id); 189 wpabuf_clear_free(data->pending_phase2_req); 190 wpabuf_clear_free(data->pending_resp); 191 bin_clear_free(data, sizeof(*data)); 192 } 193 194 195 /** 196 * eap_tlv_build_nak - Build EAP-TLV NAK message 197 * @id: EAP identifier for the header 198 * @nak_type: TLV type (EAP_TLV_*) 199 * Returns: Buffer to the allocated EAP-TLV NAK message or %NULL on failure 200 * 201 * This function builds an EAP-TLV NAK message. The caller is responsible for 202 * freeing the returned buffer. 203 */ 204 static struct wpabuf * eap_tlv_build_nak(int id, u16 nak_type) 205 { 206 struct wpabuf *msg; 207 208 msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, 10, 209 EAP_CODE_RESPONSE, id); 210 if (msg == NULL) 211 return NULL; 212 213 wpabuf_put_u8(msg, 0x80); /* Mandatory */ 214 wpabuf_put_u8(msg, EAP_TLV_NAK_TLV); 215 wpabuf_put_be16(msg, 6); /* Length */ 216 wpabuf_put_be32(msg, 0); /* Vendor-Id */ 217 wpabuf_put_be16(msg, nak_type); /* NAK-Type */ 218 219 return msg; 220 } 221 222 223 static int eap_peap_get_isk(struct eap_sm *sm, struct eap_peap_data *data, 224 u8 *isk, size_t isk_len) 225 { 226 u8 *key; 227 size_t key_len; 228 229 os_memset(isk, 0, isk_len); 230 if (data->phase2_method == NULL || data->phase2_priv == NULL || 231 data->phase2_method->isKeyAvailable == NULL || 232 data->phase2_method->getKey == NULL) 233 return 0; 234 235 if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) || 236 (key = data->phase2_method->getKey(sm, data->phase2_priv, 237 &key_len)) == NULL) { 238 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not get key material " 239 "from Phase 2"); 240 return -1; 241 } 242 243 if (key_len > isk_len) 244 key_len = isk_len; 245 os_memcpy(isk, key, key_len); 246 os_free(key); 247 248 return 0; 249 } 250 251 252 static int eap_peap_derive_cmk(struct eap_sm *sm, struct eap_peap_data *data) 253 { 254 u8 *tk; 255 u8 isk[32], imck[60]; 256 int resumed, res; 257 258 /* 259 * Tunnel key (TK) is the first 60 octets of the key generated by 260 * phase 1 of PEAP (based on TLS). 261 */ 262 tk = data->key_data; 263 if (tk == NULL) 264 return -1; 265 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TK", tk, 60); 266 267 resumed = tls_connection_resumed(sm->ssl_ctx, data->ssl.conn); 268 wpa_printf(MSG_DEBUG, 269 "EAP-PEAP: CMK derivation - reauth=%d resumed=%d phase2_eap_started=%d phase2_success=%d", 270 data->reauth, resumed, data->phase2_eap_started, 271 data->phase2_success); 272 if (data->reauth && !data->phase2_eap_started && resumed) { 273 /* Fast-connect: IPMK|CMK = TK */ 274 os_memcpy(data->ipmk, tk, 40); 275 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK from TK", 276 data->ipmk, 40); 277 os_memcpy(data->cmk, tk + 40, 20); 278 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK from TK", 279 data->cmk, 20); 280 return 0; 281 } 282 283 if (eap_peap_get_isk(sm, data, isk, sizeof(isk)) < 0) 284 return -1; 285 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: ISK", isk, sizeof(isk)); 286 287 /* 288 * IPMK Seed = "Inner Methods Compound Keys" | ISK 289 * TempKey = First 40 octets of TK 290 * IPMK|CMK = PRF+(TempKey, IPMK Seed, 60) 291 * (note: draft-josefsson-pppext-eap-tls-eap-10.txt includes a space 292 * in the end of the label just before ISK; is that just a typo?) 293 */ 294 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TempKey", tk, 40); 295 res = peap_prfplus(data->peap_version, tk, 40, 296 "Inner Methods Compound Keys", 297 isk, sizeof(isk), imck, sizeof(imck)); 298 os_memset(isk, 0, sizeof(isk)); 299 if (res < 0) 300 return -1; 301 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IMCK (IPMKj)", 302 imck, sizeof(imck)); 303 304 os_memcpy(data->ipmk, imck, 40); 305 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK (S-IPMKj)", data->ipmk, 40); 306 os_memcpy(data->cmk, imck + 40, 20); 307 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK (CMKj)", data->cmk, 20); 308 os_memset(imck, 0, sizeof(imck)); 309 310 return 0; 311 } 312 313 314 static int eap_tlv_add_cryptobinding(struct eap_sm *sm, 315 struct eap_peap_data *data, 316 struct wpabuf *buf) 317 { 318 u8 *mac; 319 u8 eap_type = EAP_TYPE_PEAP; 320 const u8 *addr[2]; 321 size_t len[2]; 322 u16 tlv_type; 323 324 /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */ 325 addr[0] = wpabuf_put(buf, 0); 326 len[0] = 60; 327 addr[1] = &eap_type; 328 len[1] = 1; 329 330 tlv_type = EAP_TLV_CRYPTO_BINDING_TLV; 331 wpabuf_put_be16(buf, tlv_type); 332 wpabuf_put_be16(buf, 56); 333 334 wpabuf_put_u8(buf, 0); /* Reserved */ 335 wpabuf_put_u8(buf, data->peap_version); /* Version */ 336 wpabuf_put_u8(buf, data->peap_version); /* RecvVersion */ 337 wpabuf_put_u8(buf, 1); /* SubType: 0 = Request, 1 = Response */ 338 wpabuf_put_data(buf, data->binding_nonce, 32); /* Nonce */ 339 mac = wpabuf_put(buf, 20); /* Compound_MAC */ 340 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC CMK", data->cmk, 20); 341 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 1", 342 addr[0], len[0]); 343 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC data 2", 344 addr[1], len[1]); 345 if (hmac_sha1_vector(data->cmk, 20, 2, addr, len, mac) < 0) 346 return -1; 347 wpa_hexdump(MSG_MSGDUMP, "EAP-PEAP: Compound_MAC", mac, SHA1_MAC_LEN); 348 data->crypto_binding_used = 1; 349 350 return 0; 351 } 352 353 354 /** 355 * eap_tlv_build_result - Build EAP-TLV Result message 356 * @id: EAP identifier for the header 357 * @status: Status (EAP_TLV_RESULT_SUCCESS or EAP_TLV_RESULT_FAILURE) 358 * Returns: Buffer to the allocated EAP-TLV Result message or %NULL on failure 359 * 360 * This function builds an EAP-TLV Result message. The caller is responsible 361 * for freeing the returned buffer. 362 */ 363 static struct wpabuf * eap_tlv_build_result(struct eap_sm *sm, 364 struct eap_peap_data *data, 365 int crypto_tlv_used, 366 int id, u16 status) 367 { 368 struct wpabuf *msg; 369 size_t len; 370 371 if (data->crypto_binding == NO_BINDING) 372 crypto_tlv_used = 0; 373 374 len = 6; 375 if (crypto_tlv_used) 376 len += 60; /* Cryptobinding TLV */ 377 msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, len, 378 EAP_CODE_RESPONSE, id); 379 if (msg == NULL) 380 return NULL; 381 382 wpabuf_put_u8(msg, 0x80); /* Mandatory */ 383 wpabuf_put_u8(msg, EAP_TLV_RESULT_TLV); 384 wpabuf_put_be16(msg, 2); /* Length */ 385 wpabuf_put_be16(msg, status); /* Status */ 386 387 if (crypto_tlv_used && eap_tlv_add_cryptobinding(sm, data, msg)) { 388 wpabuf_clear_free(msg); 389 return NULL; 390 } 391 392 return msg; 393 } 394 395 396 static int eap_tlv_validate_cryptobinding(struct eap_sm *sm, 397 struct eap_peap_data *data, 398 const u8 *crypto_tlv, 399 size_t crypto_tlv_len) 400 { 401 u8 buf[61], mac[SHA1_MAC_LEN]; 402 const u8 *pos; 403 404 if (eap_peap_derive_cmk(sm, data) < 0) { 405 wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not derive CMK"); 406 return -1; 407 } 408 409 if (crypto_tlv_len != 4 + 56) { 410 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid cryptobinding TLV " 411 "length %d", (int) crypto_tlv_len); 412 return -1; 413 } 414 415 pos = crypto_tlv; 416 pos += 4; /* TLV header */ 417 if (pos[1] != data->peap_version) { 418 wpa_printf(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV Version " 419 "mismatch (was %d; expected %d)", 420 pos[1], data->peap_version); 421 return -1; 422 } 423 424 if (pos[3] != 0) { 425 wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV " 426 "SubType %d", pos[3]); 427 return -1; 428 } 429 pos += 4; 430 os_memcpy(data->binding_nonce, pos, 32); 431 pos += 32; /* Nonce */ 432 433 /* Compound_MAC: HMAC-SHA1-160(cryptobinding TLV | EAP type) */ 434 os_memcpy(buf, crypto_tlv, 60); 435 os_memset(buf + 4 + 4 + 32, 0, 20); /* Compound_MAC */ 436 buf[60] = EAP_TYPE_PEAP; 437 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Compound_MAC data", 438 buf, sizeof(buf)); 439 hmac_sha1(data->cmk, 20, buf, sizeof(buf), mac); 440 441 if (os_memcmp_const(mac, pos, SHA1_MAC_LEN) != 0) { 442 wpa_printf(MSG_DEBUG, "EAP-PEAP: Invalid Compound_MAC in " 443 "cryptobinding TLV"); 444 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Received MAC", 445 pos, SHA1_MAC_LEN); 446 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Expected MAC", 447 mac, SHA1_MAC_LEN); 448 return -1; 449 } 450 451 wpa_printf(MSG_DEBUG, "EAP-PEAP: Valid cryptobinding TLV received"); 452 453 return 0; 454 } 455 456 457 /** 458 * eap_tlv_process - Process a received EAP-TLV message and generate a response 459 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() 460 * @ret: Return values from EAP request validation and processing 461 * @req: EAP-TLV request to be processed. The caller must have validated that 462 * the buffer is large enough to contain full request (hdr->length bytes) and 463 * that the EAP type is EAP_TYPE_TLV. 464 * @resp: Buffer to return a pointer to the allocated response message. This 465 * field should be initialized to %NULL before the call. The value will be 466 * updated if a response message is generated. The caller is responsible for 467 * freeing the allocated message. 468 * @force_failure: Force negotiation to fail 469 * Returns: 0 on success, -1 on failure 470 */ 471 static int eap_tlv_process(struct eap_sm *sm, struct eap_peap_data *data, 472 struct eap_method_ret *ret, 473 const struct wpabuf *req, struct wpabuf **resp, 474 int force_failure) 475 { 476 size_t left, tlv_len; 477 const u8 *pos; 478 const u8 *result_tlv = NULL, *crypto_tlv = NULL; 479 size_t result_tlv_len = 0, crypto_tlv_len = 0; 480 int tlv_type, mandatory; 481 482 /* Parse TLVs */ 483 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, req, &left); 484 if (pos == NULL) 485 return -1; 486 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Received TLVs", pos, left); 487 while (left >= 4) { 488 mandatory = !!(pos[0] & 0x80); 489 tlv_type = WPA_GET_BE16(pos) & 0x3fff; 490 pos += 2; 491 tlv_len = WPA_GET_BE16(pos); 492 pos += 2; 493 left -= 4; 494 if (tlv_len > left) { 495 wpa_printf(MSG_DEBUG, "EAP-TLV: TLV underrun " 496 "(tlv_len=%lu left=%lu)", 497 (unsigned long) tlv_len, 498 (unsigned long) left); 499 return -1; 500 } 501 switch (tlv_type) { 502 case EAP_TLV_RESULT_TLV: 503 result_tlv = pos; 504 result_tlv_len = tlv_len; 505 break; 506 case EAP_TLV_CRYPTO_BINDING_TLV: 507 crypto_tlv = pos; 508 crypto_tlv_len = tlv_len; 509 break; 510 default: 511 wpa_printf(MSG_DEBUG, "EAP-TLV: Unsupported TLV Type " 512 "%d%s", tlv_type, 513 mandatory ? " (mandatory)" : ""); 514 if (mandatory) { 515 /* NAK TLV and ignore all TLVs in this packet. 516 */ 517 *resp = eap_tlv_build_nak(eap_get_id(req), 518 tlv_type); 519 return *resp == NULL ? -1 : 0; 520 } 521 /* Ignore this TLV, but process other TLVs */ 522 break; 523 } 524 525 pos += tlv_len; 526 left -= tlv_len; 527 } 528 if (left) { 529 wpa_printf(MSG_DEBUG, "EAP-TLV: Last TLV too short in " 530 "Request (left=%lu)", (unsigned long) left); 531 return -1; 532 } 533 534 /* Process supported TLVs */ 535 if (crypto_tlv && data->crypto_binding != NO_BINDING) { 536 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Cryptobinding TLV", 537 crypto_tlv, crypto_tlv_len); 538 if (eap_tlv_validate_cryptobinding(sm, data, crypto_tlv - 4, 539 crypto_tlv_len + 4) < 0) { 540 if (result_tlv == NULL) 541 return -1; 542 force_failure = 1; 543 crypto_tlv = NULL; /* do not include Cryptobinding TLV 544 * in response, if the received 545 * cryptobinding was invalid. */ 546 } 547 } else if (!crypto_tlv && data->crypto_binding == REQUIRE_BINDING) { 548 wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV"); 549 return -1; 550 } 551 552 if (result_tlv) { 553 int status, resp_status; 554 wpa_hexdump(MSG_DEBUG, "EAP-TLV: Result TLV", 555 result_tlv, result_tlv_len); 556 if (result_tlv_len < 2) { 557 wpa_printf(MSG_INFO, "EAP-TLV: Too short Result TLV " 558 "(len=%lu)", 559 (unsigned long) result_tlv_len); 560 return -1; 561 } 562 status = WPA_GET_BE16(result_tlv); 563 if (status == EAP_TLV_RESULT_SUCCESS) { 564 wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Success " 565 "- EAP-TLV/Phase2 Completed"); 566 if (force_failure) { 567 wpa_printf(MSG_INFO, "EAP-TLV: Earlier failure" 568 " - force failed Phase 2"); 569 resp_status = EAP_TLV_RESULT_FAILURE; 570 ret->decision = DECISION_FAIL; 571 } else { 572 resp_status = EAP_TLV_RESULT_SUCCESS; 573 ret->decision = DECISION_UNCOND_SUCC; 574 } 575 } else if (status == EAP_TLV_RESULT_FAILURE) { 576 wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Failure"); 577 resp_status = EAP_TLV_RESULT_FAILURE; 578 ret->decision = DECISION_FAIL; 579 } else { 580 wpa_printf(MSG_INFO, "EAP-TLV: Unknown TLV Result " 581 "Status %d", status); 582 resp_status = EAP_TLV_RESULT_FAILURE; 583 ret->decision = DECISION_FAIL; 584 } 585 ret->methodState = METHOD_DONE; 586 587 *resp = eap_tlv_build_result(sm, data, crypto_tlv != NULL, 588 eap_get_id(req), resp_status); 589 } 590 591 return 0; 592 } 593 594 595 static int eap_peap_phase2_request(struct eap_sm *sm, 596 struct eap_peap_data *data, 597 struct eap_method_ret *ret, 598 struct wpabuf *req, 599 struct wpabuf **resp) 600 { 601 struct eap_hdr *hdr = wpabuf_mhead(req); 602 size_t len = be_to_host16(hdr->length); 603 u8 *pos; 604 struct eap_method_ret iret; 605 struct eap_peer_config *config = eap_get_config(sm); 606 607 if (len <= sizeof(struct eap_hdr)) { 608 wpa_printf(MSG_INFO, "EAP-PEAP: too short " 609 "Phase 2 request (len=%lu)", (unsigned long) len); 610 return -1; 611 } 612 pos = (u8 *) (hdr + 1); 613 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Request: type=%d", *pos); 614 switch (*pos) { 615 case EAP_TYPE_IDENTITY: 616 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1); 617 break; 618 case EAP_TYPE_TLV: 619 os_memset(&iret, 0, sizeof(iret)); 620 if (eap_tlv_process(sm, data, &iret, req, resp, 621 data->phase2_eap_started && 622 !data->phase2_eap_success)) { 623 ret->methodState = METHOD_DONE; 624 ret->decision = DECISION_FAIL; 625 return -1; 626 } 627 if (iret.methodState == METHOD_DONE || 628 iret.methodState == METHOD_MAY_CONT) { 629 ret->methodState = iret.methodState; 630 ret->decision = iret.decision; 631 data->phase2_success = 1; 632 } 633 break; 634 case EAP_TYPE_EXPANDED: 635 #ifdef EAP_TNC 636 if (data->soh) { 637 const u8 *epos; 638 size_t eleft; 639 640 epos = eap_hdr_validate(EAP_VENDOR_MICROSOFT, 0x21, 641 req, &eleft); 642 if (epos) { 643 struct wpabuf *buf; 644 wpa_printf(MSG_DEBUG, 645 "EAP-PEAP: SoH EAP Extensions"); 646 buf = tncc_process_soh_request(data->soh, 647 epos, eleft); 648 if (buf) { 649 *resp = eap_msg_alloc( 650 EAP_VENDOR_MICROSOFT, 0x21, 651 wpabuf_len(buf), 652 EAP_CODE_RESPONSE, 653 hdr->identifier); 654 if (*resp == NULL) { 655 ret->methodState = METHOD_DONE; 656 ret->decision = DECISION_FAIL; 657 wpabuf_clear_free(buf); 658 return -1; 659 } 660 wpabuf_put_buf(*resp, buf); 661 wpabuf_clear_free(buf); 662 break; 663 } 664 } 665 } 666 #endif /* EAP_TNC */ 667 /* fall through */ 668 default: 669 if (data->phase2_type.vendor == EAP_VENDOR_IETF && 670 data->phase2_type.method == EAP_TYPE_NONE) { 671 size_t i; 672 for (i = 0; i < data->num_phase2_types; i++) { 673 if (data->phase2_types[i].vendor != 674 EAP_VENDOR_IETF || 675 data->phase2_types[i].method != *pos) 676 continue; 677 678 data->phase2_type.vendor = 679 data->phase2_types[i].vendor; 680 data->phase2_type.method = 681 data->phase2_types[i].method; 682 wpa_printf(MSG_DEBUG, "EAP-PEAP: Selected " 683 "Phase 2 EAP vendor %d method %d", 684 data->phase2_type.vendor, 685 data->phase2_type.method); 686 break; 687 } 688 } 689 if (*pos != data->phase2_type.method || 690 *pos == EAP_TYPE_NONE) { 691 if (eap_peer_tls_phase2_nak(data->phase2_types, 692 data->num_phase2_types, 693 hdr, resp)) 694 return -1; 695 return 0; 696 } 697 698 if (data->phase2_priv == NULL) { 699 data->phase2_method = eap_peer_get_eap_method( 700 data->phase2_type.vendor, 701 data->phase2_type.method); 702 if (data->phase2_method) { 703 sm->init_phase2 = 1; 704 data->phase2_priv = 705 data->phase2_method->init(sm); 706 sm->init_phase2 = 0; 707 } 708 } 709 if (data->phase2_priv == NULL || data->phase2_method == NULL) { 710 wpa_printf(MSG_INFO, "EAP-PEAP: failed to initialize " 711 "Phase 2 EAP method %d", *pos); 712 ret->methodState = METHOD_DONE; 713 ret->decision = DECISION_FAIL; 714 return -1; 715 } 716 data->phase2_eap_started = 1; 717 os_memset(&iret, 0, sizeof(iret)); 718 *resp = data->phase2_method->process(sm, data->phase2_priv, 719 &iret, req); 720 if ((iret.methodState == METHOD_DONE || 721 iret.methodState == METHOD_MAY_CONT) && 722 (iret.decision == DECISION_UNCOND_SUCC || 723 iret.decision == DECISION_COND_SUCC)) { 724 data->phase2_eap_success = 1; 725 data->phase2_success = 1; 726 } 727 break; 728 } 729 730 if (*resp == NULL && 731 (config->pending_req_identity || config->pending_req_password || 732 config->pending_req_otp || config->pending_req_new_password || 733 config->pending_req_sim)) { 734 wpabuf_clear_free(data->pending_phase2_req); 735 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len); 736 } 737 738 return 0; 739 } 740 741 742 static int eap_peap_decrypt(struct eap_sm *sm, struct eap_peap_data *data, 743 struct eap_method_ret *ret, 744 const struct eap_hdr *req, 745 const struct wpabuf *in_data, 746 struct wpabuf **out_data) 747 { 748 struct wpabuf *in_decrypted = NULL; 749 int res, skip_change = 0; 750 struct eap_hdr *hdr, *rhdr; 751 struct wpabuf *resp = NULL; 752 size_t len; 753 754 wpa_printf(MSG_DEBUG, "EAP-PEAP: received %lu bytes encrypted data for" 755 " Phase 2", (unsigned long) wpabuf_len(in_data)); 756 757 if (data->pending_phase2_req) { 758 wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 request - " 759 "skip decryption and use old data"); 760 /* Clear TLS reassembly state. */ 761 eap_peer_tls_reset_input(&data->ssl); 762 in_decrypted = data->pending_phase2_req; 763 data->pending_phase2_req = NULL; 764 skip_change = 1; 765 goto continue_req; 766 } 767 768 if (wpabuf_len(in_data) == 0 && sm->workaround && 769 data->phase2_success) { 770 /* 771 * Cisco ACS seems to be using TLS ACK to terminate 772 * EAP-PEAPv0/GTC. Try to reply with TLS ACK. 773 */ 774 wpa_printf(MSG_DEBUG, "EAP-PEAP: Received TLS ACK, but " 775 "expected data - acknowledge with TLS ACK since " 776 "Phase 2 has been completed"); 777 ret->decision = DECISION_COND_SUCC; 778 ret->methodState = METHOD_DONE; 779 return 1; 780 } else if (wpabuf_len(in_data) == 0) { 781 /* Received TLS ACK - requesting more fragments */ 782 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP, 783 data->peap_version, 784 req->identifier, NULL, out_data); 785 } 786 787 res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted); 788 if (res) 789 return res; 790 791 continue_req: 792 wpa_hexdump_buf(MSG_DEBUG, "EAP-PEAP: Decrypted Phase 2 EAP", 793 in_decrypted); 794 795 hdr = wpabuf_mhead(in_decrypted); 796 if (wpabuf_len(in_decrypted) == 5 && hdr->code == EAP_CODE_REQUEST && 797 be_to_host16(hdr->length) == 5 && 798 eap_get_type(in_decrypted) == EAP_TYPE_IDENTITY) { 799 /* At least FreeRADIUS seems to send full EAP header with 800 * EAP Request Identity */ 801 skip_change = 1; 802 } 803 if (wpabuf_len(in_decrypted) >= 5 && hdr->code == EAP_CODE_REQUEST && 804 eap_get_type(in_decrypted) == EAP_TYPE_TLV) { 805 skip_change = 1; 806 } 807 808 if (data->peap_version == 0 && !skip_change) { 809 struct eap_hdr *nhdr; 810 struct wpabuf *nmsg = wpabuf_alloc(sizeof(struct eap_hdr) + 811 wpabuf_len(in_decrypted)); 812 if (nmsg == NULL) { 813 wpabuf_clear_free(in_decrypted); 814 return 0; 815 } 816 nhdr = wpabuf_put(nmsg, sizeof(*nhdr)); 817 wpabuf_put_buf(nmsg, in_decrypted); 818 nhdr->code = req->code; 819 nhdr->identifier = req->identifier; 820 nhdr->length = host_to_be16(sizeof(struct eap_hdr) + 821 wpabuf_len(in_decrypted)); 822 823 wpabuf_clear_free(in_decrypted); 824 in_decrypted = nmsg; 825 } 826 827 hdr = wpabuf_mhead(in_decrypted); 828 if (wpabuf_len(in_decrypted) < sizeof(*hdr)) { 829 wpa_printf(MSG_INFO, "EAP-PEAP: Too short Phase 2 " 830 "EAP frame (len=%lu)", 831 (unsigned long) wpabuf_len(in_decrypted)); 832 wpabuf_clear_free(in_decrypted); 833 return 0; 834 } 835 len = be_to_host16(hdr->length); 836 if (len > wpabuf_len(in_decrypted)) { 837 wpa_printf(MSG_INFO, "EAP-PEAP: Length mismatch in " 838 "Phase 2 EAP frame (len=%lu hdr->length=%lu)", 839 (unsigned long) wpabuf_len(in_decrypted), 840 (unsigned long) len); 841 wpabuf_clear_free(in_decrypted); 842 return 0; 843 } 844 if (len < wpabuf_len(in_decrypted)) { 845 wpa_printf(MSG_INFO, "EAP-PEAP: Odd.. Phase 2 EAP header has " 846 "shorter length than full decrypted data " 847 "(%lu < %lu)", 848 (unsigned long) len, 849 (unsigned long) wpabuf_len(in_decrypted)); 850 } 851 wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d " 852 "identifier=%d length=%lu", hdr->code, hdr->identifier, 853 (unsigned long) len); 854 switch (hdr->code) { 855 case EAP_CODE_REQUEST: 856 if (eap_peap_phase2_request(sm, data, ret, in_decrypted, 857 &resp)) { 858 wpabuf_clear_free(in_decrypted); 859 wpa_printf(MSG_INFO, "EAP-PEAP: Phase2 Request " 860 "processing failed"); 861 return 0; 862 } 863 break; 864 case EAP_CODE_SUCCESS: 865 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success"); 866 if (data->peap_version == 1) { 867 /* EAP-Success within TLS tunnel is used to indicate 868 * shutdown of the TLS channel. The authentication has 869 * been completed. */ 870 if (data->phase2_eap_started && 871 !data->phase2_eap_success) { 872 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 " 873 "Success used to indicate success, " 874 "but Phase 2 EAP was not yet " 875 "completed successfully"); 876 ret->methodState = METHOD_DONE; 877 ret->decision = DECISION_FAIL; 878 wpabuf_clear_free(in_decrypted); 879 return 0; 880 } 881 wpa_printf(MSG_DEBUG, "EAP-PEAP: Version 1 - " 882 "EAP-Success within TLS tunnel - " 883 "authentication completed"); 884 ret->decision = DECISION_UNCOND_SUCC; 885 ret->methodState = METHOD_DONE; 886 data->phase2_success = 1; 887 if (data->peap_outer_success == 2) { 888 wpabuf_clear_free(in_decrypted); 889 wpa_printf(MSG_DEBUG, "EAP-PEAP: Use TLS ACK " 890 "to finish authentication"); 891 return 1; 892 } else if (data->peap_outer_success == 1) { 893 /* Reply with EAP-Success within the TLS 894 * channel to complete the authentication. */ 895 resp = wpabuf_alloc(sizeof(struct eap_hdr)); 896 if (resp) { 897 rhdr = wpabuf_put(resp, sizeof(*rhdr)); 898 rhdr->code = EAP_CODE_SUCCESS; 899 rhdr->identifier = hdr->identifier; 900 rhdr->length = 901 host_to_be16(sizeof(*rhdr)); 902 } 903 } else { 904 /* No EAP-Success expected for Phase 1 (outer, 905 * unencrypted auth), so force EAP state 906 * machine to SUCCESS state. */ 907 sm->peap_done = TRUE; 908 } 909 } else { 910 /* FIX: ? */ 911 } 912 break; 913 case EAP_CODE_FAILURE: 914 wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure"); 915 ret->decision = DECISION_FAIL; 916 ret->methodState = METHOD_MAY_CONT; 917 ret->allowNotifications = FALSE; 918 /* Reply with EAP-Failure within the TLS channel to complete 919 * failure reporting. */ 920 resp = wpabuf_alloc(sizeof(struct eap_hdr)); 921 if (resp) { 922 rhdr = wpabuf_put(resp, sizeof(*rhdr)); 923 rhdr->code = EAP_CODE_FAILURE; 924 rhdr->identifier = hdr->identifier; 925 rhdr->length = host_to_be16(sizeof(*rhdr)); 926 } 927 break; 928 default: 929 wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in " 930 "Phase 2 EAP header", hdr->code); 931 break; 932 } 933 934 wpabuf_clear_free(in_decrypted); 935 936 if (resp) { 937 int skip_change2 = 0; 938 struct wpabuf *rmsg, buf; 939 940 wpa_hexdump_buf_key(MSG_DEBUG, 941 "EAP-PEAP: Encrypting Phase 2 data", resp); 942 /* PEAP version changes */ 943 if (wpabuf_len(resp) >= 5 && 944 wpabuf_head_u8(resp)[0] == EAP_CODE_RESPONSE && 945 eap_get_type(resp) == EAP_TYPE_TLV) 946 skip_change2 = 1; 947 rmsg = resp; 948 if (data->peap_version == 0 && !skip_change2) { 949 wpabuf_set(&buf, wpabuf_head_u8(resp) + 950 sizeof(struct eap_hdr), 951 wpabuf_len(resp) - sizeof(struct eap_hdr)); 952 rmsg = &buf; 953 } 954 955 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP, 956 data->peap_version, req->identifier, 957 rmsg, out_data)) { 958 wpa_printf(MSG_INFO, "EAP-PEAP: Failed to encrypt " 959 "a Phase 2 frame"); 960 } 961 wpabuf_clear_free(resp); 962 } 963 964 return 0; 965 } 966 967 968 static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv, 969 struct eap_method_ret *ret, 970 const struct wpabuf *reqData) 971 { 972 const struct eap_hdr *req; 973 size_t left; 974 int res; 975 u8 flags, id; 976 struct wpabuf *resp; 977 const u8 *pos; 978 struct eap_peap_data *data = priv; 979 struct wpabuf msg; 980 981 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_PEAP, ret, 982 reqData, &left, &flags); 983 if (pos == NULL) 984 return NULL; 985 req = wpabuf_head(reqData); 986 id = req->identifier; 987 988 if (flags & EAP_TLS_FLAGS_START) { 989 wpa_printf(MSG_DEBUG, "EAP-PEAP: Start (server ver=%d, own " 990 "ver=%d)", flags & EAP_TLS_VERSION_MASK, 991 data->peap_version); 992 if ((flags & EAP_TLS_VERSION_MASK) < data->peap_version) 993 data->peap_version = flags & EAP_TLS_VERSION_MASK; 994 if (data->force_peap_version >= 0 && 995 data->force_peap_version != data->peap_version) { 996 wpa_printf(MSG_WARNING, "EAP-PEAP: Failed to select " 997 "forced PEAP version %d", 998 data->force_peap_version); 999 ret->methodState = METHOD_DONE; 1000 ret->decision = DECISION_FAIL; 1001 ret->allowNotifications = FALSE; 1002 return NULL; 1003 } 1004 wpa_printf(MSG_DEBUG, "EAP-PEAP: Using PEAP version %d", 1005 data->peap_version); 1006 left = 0; /* make sure that this frame is empty, even though it 1007 * should always be, anyway */ 1008 } 1009 1010 wpabuf_set(&msg, pos, left); 1011 1012 resp = NULL; 1013 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) && 1014 !data->resuming) { 1015 res = eap_peap_decrypt(sm, data, ret, req, &msg, &resp); 1016 } else { 1017 if (sm->waiting_ext_cert_check && data->pending_resp) { 1018 struct eap_peer_config *config = eap_get_config(sm); 1019 1020 if (config->pending_ext_cert_check == 1021 EXT_CERT_CHECK_GOOD) { 1022 wpa_printf(MSG_DEBUG, 1023 "EAP-PEAP: External certificate check succeeded - continue handshake"); 1024 resp = data->pending_resp; 1025 data->pending_resp = NULL; 1026 sm->waiting_ext_cert_check = 0; 1027 return resp; 1028 } 1029 1030 if (config->pending_ext_cert_check == 1031 EXT_CERT_CHECK_BAD) { 1032 wpa_printf(MSG_DEBUG, 1033 "EAP-PEAP: External certificate check failed - force authentication failure"); 1034 ret->methodState = METHOD_DONE; 1035 ret->decision = DECISION_FAIL; 1036 sm->waiting_ext_cert_check = 0; 1037 return NULL; 1038 } 1039 1040 wpa_printf(MSG_DEBUG, 1041 "EAP-PEAP: Continuing to wait external server certificate validation"); 1042 return NULL; 1043 } 1044 1045 res = eap_peer_tls_process_helper(sm, &data->ssl, 1046 EAP_TYPE_PEAP, 1047 data->peap_version, id, &msg, 1048 &resp); 1049 1050 if (res < 0) { 1051 wpa_printf(MSG_DEBUG, 1052 "EAP-PEAP: TLS processing failed"); 1053 ret->methodState = METHOD_DONE; 1054 ret->decision = DECISION_FAIL; 1055 return resp; 1056 } 1057 1058 1059 if (sm->waiting_ext_cert_check) { 1060 wpa_printf(MSG_DEBUG, 1061 "EAP-PEAP: Waiting external server certificate validation"); 1062 wpabuf_clear_free(data->pending_resp); 1063 data->pending_resp = resp; 1064 return NULL; 1065 } 1066 1067 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) { 1068 char *label; 1069 wpa_printf(MSG_DEBUG, 1070 "EAP-PEAP: TLS done, proceed to Phase 2"); 1071 eap_peap_free_key(data); 1072 /* draft-josefsson-ppext-eap-tls-eap-05.txt 1073 * specifies that PEAPv1 would use "client PEAP 1074 * encryption" as the label. However, most existing 1075 * PEAPv1 implementations seem to be using the old 1076 * label, "client EAP encryption", instead. Use the old 1077 * label by default, but allow it to be configured with 1078 * phase1 parameter peaplabel=1. */ 1079 if (data->force_new_label) 1080 label = "client PEAP encryption"; 1081 else 1082 label = "client EAP encryption"; 1083 wpa_printf(MSG_DEBUG, "EAP-PEAP: using label '%s' in " 1084 "key derivation", label); 1085 data->key_data = 1086 eap_peer_tls_derive_key(sm, &data->ssl, label, 1087 NULL, 0, 1088 EAP_TLS_KEY_LEN + 1089 EAP_EMSK_LEN); 1090 if (data->key_data) { 1091 wpa_hexdump_key(MSG_DEBUG, 1092 "EAP-PEAP: Derived key", 1093 data->key_data, 1094 EAP_TLS_KEY_LEN); 1095 wpa_hexdump_key(MSG_DEBUG, 1096 "EAP-PEAP: Derived EMSK", 1097 data->key_data + 1098 EAP_TLS_KEY_LEN, 1099 EAP_EMSK_LEN); 1100 } else { 1101 wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to " 1102 "derive key"); 1103 } 1104 1105 os_free(data->session_id); 1106 data->session_id = 1107 eap_peer_tls_derive_session_id(sm, &data->ssl, 1108 EAP_TYPE_PEAP, 1109 &data->id_len); 1110 if (data->session_id) { 1111 wpa_hexdump(MSG_DEBUG, 1112 "EAP-PEAP: Derived Session-Id", 1113 data->session_id, data->id_len); 1114 } else { 1115 wpa_printf(MSG_ERROR, "EAP-PEAP: Failed to " 1116 "derive Session-Id"); 1117 } 1118 1119 if (sm->workaround && data->resuming) { 1120 /* 1121 * At least few RADIUS servers (Aegis v1.1.6; 1122 * but not v1.1.4; and Cisco ACS) seem to be 1123 * terminating PEAPv1 (Aegis) or PEAPv0 (Cisco 1124 * ACS) session resumption with outer 1125 * EAP-Success. This does not seem to follow 1126 * draft-josefsson-pppext-eap-tls-eap-05.txt 1127 * section 4.2, so only allow this if EAP 1128 * workarounds are enabled. 1129 */ 1130 wpa_printf(MSG_DEBUG, "EAP-PEAP: Workaround - " 1131 "allow outer EAP-Success to " 1132 "terminate PEAP resumption"); 1133 ret->decision = DECISION_COND_SUCC; 1134 data->phase2_success = 1; 1135 } 1136 1137 data->resuming = 0; 1138 } 1139 1140 if (res == 2) { 1141 /* 1142 * Application data included in the handshake message. 1143 */ 1144 wpabuf_clear_free(data->pending_phase2_req); 1145 data->pending_phase2_req = resp; 1146 resp = NULL; 1147 res = eap_peap_decrypt(sm, data, ret, req, &msg, 1148 &resp); 1149 } 1150 } 1151 1152 if (ret->methodState == METHOD_DONE) { 1153 ret->allowNotifications = FALSE; 1154 } 1155 1156 if (res == 1) { 1157 wpabuf_clear_free(resp); 1158 return eap_peer_tls_build_ack(id, EAP_TYPE_PEAP, 1159 data->peap_version); 1160 } 1161 1162 return resp; 1163 } 1164 1165 1166 static Boolean eap_peap_has_reauth_data(struct eap_sm *sm, void *priv) 1167 { 1168 struct eap_peap_data *data = priv; 1169 return tls_connection_established(sm->ssl_ctx, data->ssl.conn) && 1170 data->phase2_success; 1171 } 1172 1173 1174 static void eap_peap_deinit_for_reauth(struct eap_sm *sm, void *priv) 1175 { 1176 struct eap_peap_data *data = priv; 1177 1178 if (data->phase2_priv && data->phase2_method && 1179 data->phase2_method->deinit_for_reauth) 1180 data->phase2_method->deinit_for_reauth(sm, data->phase2_priv); 1181 wpabuf_clear_free(data->pending_phase2_req); 1182 data->pending_phase2_req = NULL; 1183 wpabuf_clear_free(data->pending_resp); 1184 data->pending_resp = NULL; 1185 data->crypto_binding_used = 0; 1186 } 1187 1188 1189 static void * eap_peap_init_for_reauth(struct eap_sm *sm, void *priv) 1190 { 1191 struct eap_peap_data *data = priv; 1192 eap_peap_free_key(data); 1193 os_free(data->session_id); 1194 data->session_id = NULL; 1195 if (eap_peer_tls_reauth_init(sm, &data->ssl)) { 1196 os_free(data); 1197 return NULL; 1198 } 1199 if (data->phase2_priv && data->phase2_method && 1200 data->phase2_method->init_for_reauth) 1201 data->phase2_method->init_for_reauth(sm, data->phase2_priv); 1202 data->phase2_success = 0; 1203 data->phase2_eap_success = 0; 1204 data->phase2_eap_started = 0; 1205 data->resuming = 1; 1206 data->reauth = 1; 1207 sm->peap_done = FALSE; 1208 return priv; 1209 } 1210 1211 1212 static int eap_peap_get_status(struct eap_sm *sm, void *priv, char *buf, 1213 size_t buflen, int verbose) 1214 { 1215 struct eap_peap_data *data = priv; 1216 int len, ret; 1217 1218 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose); 1219 if (data->phase2_method) { 1220 ret = os_snprintf(buf + len, buflen - len, 1221 "EAP-PEAPv%d Phase2 method=%s\n", 1222 data->peap_version, 1223 data->phase2_method->name); 1224 if (os_snprintf_error(buflen - len, ret)) 1225 return len; 1226 len += ret; 1227 } 1228 return len; 1229 } 1230 1231 1232 static Boolean eap_peap_isKeyAvailable(struct eap_sm *sm, void *priv) 1233 { 1234 struct eap_peap_data *data = priv; 1235 return data->key_data != NULL && data->phase2_success; 1236 } 1237 1238 1239 static u8 * eap_peap_getKey(struct eap_sm *sm, void *priv, size_t *len) 1240 { 1241 struct eap_peap_data *data = priv; 1242 u8 *key; 1243 1244 if (data->key_data == NULL || !data->phase2_success) 1245 return NULL; 1246 1247 key = os_malloc(EAP_TLS_KEY_LEN); 1248 if (key == NULL) 1249 return NULL; 1250 1251 *len = EAP_TLS_KEY_LEN; 1252 1253 if (data->crypto_binding_used) { 1254 u8 csk[128]; 1255 /* 1256 * Note: It looks like Microsoft implementation requires null 1257 * termination for this label while the one used for deriving 1258 * IPMK|CMK did not use null termination. 1259 */ 1260 if (peap_prfplus(data->peap_version, data->ipmk, 40, 1261 "Session Key Generating Function", 1262 (u8 *) "\00", 1, csk, sizeof(csk)) < 0) { 1263 os_free(key); 1264 return NULL; 1265 } 1266 wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk)); 1267 os_memcpy(key, csk, EAP_TLS_KEY_LEN); 1268 wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key", 1269 key, EAP_TLS_KEY_LEN); 1270 os_memset(csk, 0, sizeof(csk)); 1271 } else 1272 os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN); 1273 1274 return key; 1275 } 1276 1277 1278 static u8 * eap_peap_get_emsk(struct eap_sm *sm, void *priv, size_t *len) 1279 { 1280 struct eap_peap_data *data = priv; 1281 u8 *key; 1282 1283 if (!data->key_data || !data->phase2_success) 1284 return NULL; 1285 1286 if (data->crypto_binding_used) { 1287 /* [MS-PEAP] does not define EMSK derivation */ 1288 return NULL; 1289 } 1290 1291 key = os_memdup(data->key_data + EAP_TLS_KEY_LEN, EAP_EMSK_LEN); 1292 if (!key) 1293 return NULL; 1294 1295 *len = EAP_EMSK_LEN; 1296 1297 return key; 1298 } 1299 1300 1301 static u8 * eap_peap_get_session_id(struct eap_sm *sm, void *priv, size_t *len) 1302 { 1303 struct eap_peap_data *data = priv; 1304 u8 *id; 1305 1306 if (data->session_id == NULL || !data->phase2_success) 1307 return NULL; 1308 1309 id = os_memdup(data->session_id, data->id_len); 1310 if (id == NULL) 1311 return NULL; 1312 1313 *len = data->id_len; 1314 1315 return id; 1316 } 1317 1318 1319 int eap_peer_peap_register(void) 1320 { 1321 struct eap_method *eap; 1322 1323 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION, 1324 EAP_VENDOR_IETF, EAP_TYPE_PEAP, "PEAP"); 1325 if (eap == NULL) 1326 return -1; 1327 1328 eap->init = eap_peap_init; 1329 eap->deinit = eap_peap_deinit; 1330 eap->process = eap_peap_process; 1331 eap->isKeyAvailable = eap_peap_isKeyAvailable; 1332 eap->getKey = eap_peap_getKey; 1333 eap->get_emsk = eap_peap_get_emsk; 1334 eap->get_status = eap_peap_get_status; 1335 eap->has_reauth_data = eap_peap_has_reauth_data; 1336 eap->deinit_for_reauth = eap_peap_deinit_for_reauth; 1337 eap->init_for_reauth = eap_peap_init_for_reauth; 1338 eap->getSessionId = eap_peap_get_session_id; 1339 1340 return eap_peer_method_register(eap); 1341 } 1342
