1 /* 2 * WPA Supplicant - WPA state machine and EAPOL-Key processing 3 * Copyright (c) 2003-2008, Jouni Malinen <j (at) 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/rc4.h" 19 #include "crypto/aes_wrap.h" 20 #include "wpa.h" 21 #include "eloop.h" 22 #include "eapol_supp/eapol_supp_sm.h" 23 #include "preauth.h" 24 #include "pmksa_cache.h" 25 #include "wpa_i.h" 26 #include "wpa_ie.h" 27 #include "peerkey.h" 28 #include "ieee802_11_defs.h" 29 30 31 /** 32 * wpa_cipher_txt - Convert cipher suite to a text string 33 * @cipher: Cipher suite (WPA_CIPHER_* enum) 34 * Returns: Pointer to a text string of the cipher suite name 35 */ 36 static const char * wpa_cipher_txt(int cipher) 37 { 38 switch (cipher) { 39 case WPA_CIPHER_NONE: 40 return "NONE"; 41 case WPA_CIPHER_WEP40: 42 return "WEP-40"; 43 case WPA_CIPHER_WEP104: 44 return "WEP-104"; 45 case WPA_CIPHER_TKIP: 46 return "TKIP"; 47 case WPA_CIPHER_CCMP: 48 return "CCMP"; 49 default: 50 return "UNKNOWN"; 51 } 52 } 53 54 55 /** 56 * wpa_key_mgmt_txt - Convert key management suite to a text string 57 * @key_mgmt: Key management suite (WPA_KEY_MGMT_* enum) 58 * @proto: WPA/WPA2 version (WPA_PROTO_*) 59 * Returns: Pointer to a text string of the key management suite name 60 */ 61 static const char * wpa_key_mgmt_txt(int key_mgmt, int proto) 62 { 63 switch (key_mgmt) { 64 case WPA_KEY_MGMT_IEEE8021X: 65 return proto == WPA_PROTO_RSN ? 66 "WPA2/IEEE 802.1X/EAP" : "WPA/IEEE 802.1X/EAP"; 67 case WPA_KEY_MGMT_PSK: 68 return proto == WPA_PROTO_RSN ? 69 "WPA2-PSK" : "WPA-PSK"; 70 case WPA_KEY_MGMT_NONE: 71 return "NONE"; 72 case WPA_KEY_MGMT_IEEE8021X_NO_WPA: 73 return "IEEE 802.1X (no WPA)"; 74 #ifdef CONFIG_IEEE80211R 75 case WPA_KEY_MGMT_FT_IEEE8021X: 76 return "FT-EAP"; 77 case WPA_KEY_MGMT_FT_PSK: 78 return "FT-PSK"; 79 #endif /* CONFIG_IEEE80211R */ 80 #ifdef CONFIG_IEEE80211W 81 case WPA_KEY_MGMT_IEEE8021X_SHA256: 82 return "WPA2-EAP-SHA256"; 83 case WPA_KEY_MGMT_PSK_SHA256: 84 return "WPA2-PSK-SHA256"; 85 #endif /* CONFIG_IEEE80211W */ 86 default: 87 return "UNKNOWN"; 88 } 89 } 90 91 92 /** 93 * wpa_eapol_key_send - Send WPA/RSN EAPOL-Key message 94 * @sm: Pointer to WPA state machine data from wpa_sm_init() 95 * @kck: Key Confirmation Key (KCK, part of PTK) 96 * @ver: Version field from Key Info 97 * @dest: Destination address for the frame 98 * @proto: Ethertype (usually ETH_P_EAPOL) 99 * @msg: EAPOL-Key message 100 * @msg_len: Length of message 101 * @key_mic: Pointer to the buffer to which the EAPOL-Key MIC is written 102 */ 103 void wpa_eapol_key_send(struct wpa_sm *sm, const u8 *kck, 104 int ver, const u8 *dest, u16 proto, 105 u8 *msg, size_t msg_len, u8 *key_mic) 106 { 107 if (is_zero_ether_addr(dest) && is_zero_ether_addr(sm->bssid)) { 108 /* 109 * Association event was not yet received; try to fetch 110 * BSSID from the driver. 111 */ 112 if (wpa_sm_get_bssid(sm, sm->bssid) < 0) { 113 wpa_printf(MSG_DEBUG, "WPA: Failed to read BSSID for " 114 "EAPOL-Key destination address"); 115 } else { 116 dest = sm->bssid; 117 wpa_printf(MSG_DEBUG, "WPA: Use BSSID (" MACSTR 118 ") as the destination for EAPOL-Key", 119 MAC2STR(dest)); 120 } 121 } 122 if (key_mic) 123 wpa_eapol_key_mic(kck, ver, msg, msg_len, key_mic); 124 wpa_hexdump(MSG_MSGDUMP, "WPA: TX EAPOL-Key", msg, msg_len); 125 wpa_sm_ether_send(sm, dest, proto, msg, msg_len); 126 eapol_sm_notify_tx_eapol_key(sm->eapol); 127 os_free(msg); 128 } 129 130 131 /** 132 * wpa_sm_key_request - Send EAPOL-Key Request 133 * @sm: Pointer to WPA state machine data from wpa_sm_init() 134 * @error: Indicate whether this is an Michael MIC error report 135 * @pairwise: 1 = error report for pairwise packet, 0 = for group packet 136 * 137 * Send an EAPOL-Key Request to the current authenticator. This function is 138 * used to request rekeying and it is usually called when a local Michael MIC 139 * failure is detected. 140 */ 141 void wpa_sm_key_request(struct wpa_sm *sm, int error, int pairwise) 142 { 143 size_t rlen; 144 struct wpa_eapol_key *reply; 145 int key_info, ver; 146 u8 bssid[ETH_ALEN], *rbuf; 147 148 if (wpa_key_mgmt_ft(sm->key_mgmt) || wpa_key_mgmt_sha256(sm->key_mgmt)) 149 ver = WPA_KEY_INFO_TYPE_AES_128_CMAC; 150 else if (sm->pairwise_cipher == WPA_CIPHER_CCMP) 151 ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES; 152 else 153 ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4; 154 155 if (wpa_sm_get_bssid(sm, bssid) < 0) { 156 wpa_printf(MSG_WARNING, "Failed to read BSSID for EAPOL-Key " 157 "request"); 158 return; 159 } 160 161 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL, 162 sizeof(*reply), &rlen, (void *) &reply); 163 if (rbuf == NULL) 164 return; 165 166 reply->type = sm->proto == WPA_PROTO_RSN ? 167 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; 168 key_info = WPA_KEY_INFO_REQUEST | ver; 169 if (sm->ptk_set) 170 key_info |= WPA_KEY_INFO_MIC; 171 if (error) 172 key_info |= WPA_KEY_INFO_ERROR; 173 if (pairwise) 174 key_info |= WPA_KEY_INFO_KEY_TYPE; 175 WPA_PUT_BE16(reply->key_info, key_info); 176 WPA_PUT_BE16(reply->key_length, 0); 177 os_memcpy(reply->replay_counter, sm->request_counter, 178 WPA_REPLAY_COUNTER_LEN); 179 inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN); 180 181 WPA_PUT_BE16(reply->key_data_length, 0); 182 183 wpa_printf(MSG_INFO, "WPA: Sending EAPOL-Key Request (error=%d " 184 "pairwise=%d ptk_set=%d len=%lu)", 185 error, pairwise, sm->ptk_set, (unsigned long) rlen); 186 wpa_eapol_key_send(sm, sm->ptk.kck, ver, bssid, ETH_P_EAPOL, 187 rbuf, rlen, key_info & WPA_KEY_INFO_MIC ? 188 reply->key_mic : NULL); 189 } 190 191 192 static int wpa_supplicant_get_pmk(struct wpa_sm *sm, 193 const unsigned char *src_addr, 194 const u8 *pmkid) 195 { 196 int abort_cached = 0; 197 198 if (pmkid && !sm->cur_pmksa) { 199 /* When using drivers that generate RSN IE, wpa_supplicant may 200 * not have enough time to get the association information 201 * event before receiving this 1/4 message, so try to find a 202 * matching PMKSA cache entry here. */ 203 sm->cur_pmksa = pmksa_cache_get(sm->pmksa, src_addr, pmkid); 204 if (sm->cur_pmksa) { 205 wpa_printf(MSG_DEBUG, "RSN: found matching PMKID from " 206 "PMKSA cache"); 207 } else { 208 wpa_printf(MSG_DEBUG, "RSN: no matching PMKID found"); 209 abort_cached = 1; 210 } 211 } 212 213 if (pmkid && sm->cur_pmksa && 214 os_memcmp(pmkid, sm->cur_pmksa->pmkid, PMKID_LEN) == 0) { 215 wpa_hexdump(MSG_DEBUG, "RSN: matched PMKID", pmkid, PMKID_LEN); 216 wpa_sm_set_pmk_from_pmksa(sm); 217 wpa_hexdump_key(MSG_DEBUG, "RSN: PMK from PMKSA cache", 218 sm->pmk, sm->pmk_len); 219 eapol_sm_notify_cached(sm->eapol); 220 #ifdef CONFIG_IEEE80211R 221 sm->xxkey_len = 0; 222 #endif /* CONFIG_IEEE80211R */ 223 } else if (wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt) && sm->eapol) { 224 int res, pmk_len; 225 pmk_len = PMK_LEN; 226 res = eapol_sm_get_key(sm->eapol, sm->pmk, PMK_LEN); 227 if (res) { 228 /* 229 * EAP-LEAP is an exception from other EAP methods: it 230 * uses only 16-byte PMK. 231 */ 232 res = eapol_sm_get_key(sm->eapol, sm->pmk, 16); 233 pmk_len = 16; 234 } else { 235 #ifdef CONFIG_IEEE80211R 236 u8 buf[2 * PMK_LEN]; 237 if (eapol_sm_get_key(sm->eapol, buf, 2 * PMK_LEN) == 0) 238 { 239 os_memcpy(sm->xxkey, buf + PMK_LEN, PMK_LEN); 240 sm->xxkey_len = PMK_LEN; 241 os_memset(buf, 0, sizeof(buf)); 242 } 243 #endif /* CONFIG_IEEE80211R */ 244 } 245 if (res == 0) { 246 wpa_hexdump_key(MSG_DEBUG, "WPA: PMK from EAPOL state " 247 "machines", sm->pmk, pmk_len); 248 sm->pmk_len = pmk_len; 249 pmksa_cache_add(sm->pmksa, sm->pmk, pmk_len, src_addr, 250 sm->own_addr, sm->network_ctx, 251 sm->key_mgmt); 252 if (!sm->cur_pmksa && pmkid && 253 pmksa_cache_get(sm->pmksa, src_addr, pmkid)) { 254 wpa_printf(MSG_DEBUG, "RSN: the new PMK " 255 "matches with the PMKID"); 256 abort_cached = 0; 257 } 258 } else { 259 wpa_msg(sm->ctx->ctx, MSG_WARNING, 260 "WPA: Failed to get master session key from " 261 "EAPOL state machines"); 262 wpa_msg(sm->ctx->ctx, MSG_WARNING, 263 "WPA: Key handshake aborted"); 264 if (sm->cur_pmksa) { 265 wpa_printf(MSG_DEBUG, "RSN: Cancelled PMKSA " 266 "caching attempt"); 267 sm->cur_pmksa = NULL; 268 abort_cached = 1; 269 } else if (!abort_cached) { 270 return -1; 271 } 272 } 273 } 274 275 if (abort_cached && wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt)) { 276 /* Send EAPOL-Start to trigger full EAP authentication. */ 277 u8 *buf; 278 size_t buflen; 279 280 wpa_printf(MSG_DEBUG, "RSN: no PMKSA entry found - trigger " 281 "full EAP authentication"); 282 buf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_START, 283 NULL, 0, &buflen, NULL); 284 if (buf) { 285 wpa_sm_ether_send(sm, sm->bssid, ETH_P_EAPOL, 286 buf, buflen); 287 os_free(buf); 288 return -2; 289 } 290 291 return -1; 292 } 293 294 return 0; 295 } 296 297 298 /** 299 * wpa_supplicant_send_2_of_4 - Send message 2 of WPA/RSN 4-Way Handshake 300 * @sm: Pointer to WPA state machine data from wpa_sm_init() 301 * @dst: Destination address for the frame 302 * @key: Pointer to the EAPOL-Key frame header 303 * @ver: Version bits from EAPOL-Key Key Info 304 * @nonce: Nonce value for the EAPOL-Key frame 305 * @wpa_ie: WPA/RSN IE 306 * @wpa_ie_len: Length of the WPA/RSN IE 307 * @ptk: PTK to use for keyed hash and encryption 308 * Returns: 0 on success, -1 on failure 309 */ 310 int wpa_supplicant_send_2_of_4(struct wpa_sm *sm, const unsigned char *dst, 311 const struct wpa_eapol_key *key, 312 int ver, const u8 *nonce, 313 const u8 *wpa_ie, size_t wpa_ie_len, 314 struct wpa_ptk *ptk) 315 { 316 size_t rlen; 317 struct wpa_eapol_key *reply; 318 u8 *rbuf; 319 320 if (wpa_ie == NULL) { 321 wpa_printf(MSG_WARNING, "WPA: No wpa_ie set - cannot " 322 "generate msg 2/4"); 323 return -1; 324 } 325 326 wpa_hexdump(MSG_DEBUG, "WPA: WPA IE for msg 2/4", wpa_ie, wpa_ie_len); 327 328 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, 329 NULL, sizeof(*reply) + wpa_ie_len, 330 &rlen, (void *) &reply); 331 if (rbuf == NULL) 332 return -1; 333 334 reply->type = sm->proto == WPA_PROTO_RSN ? 335 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; 336 WPA_PUT_BE16(reply->key_info, 337 ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_MIC); 338 if (sm->proto == WPA_PROTO_RSN) 339 WPA_PUT_BE16(reply->key_length, 0); 340 else 341 os_memcpy(reply->key_length, key->key_length, 2); 342 os_memcpy(reply->replay_counter, key->replay_counter, 343 WPA_REPLAY_COUNTER_LEN); 344 345 WPA_PUT_BE16(reply->key_data_length, wpa_ie_len); 346 os_memcpy(reply + 1, wpa_ie, wpa_ie_len); 347 348 os_memcpy(reply->key_nonce, nonce, WPA_NONCE_LEN); 349 350 wpa_printf(MSG_DEBUG, "WPA: Sending EAPOL-Key 2/4"); 351 wpa_eapol_key_send(sm, ptk->kck, ver, dst, ETH_P_EAPOL, 352 rbuf, rlen, reply->key_mic); 353 354 return 0; 355 } 356 357 358 static int wpa_derive_ptk(struct wpa_sm *sm, const unsigned char *src_addr, 359 const struct wpa_eapol_key *key, 360 struct wpa_ptk *ptk) 361 { 362 size_t ptk_len = sm->pairwise_cipher == WPA_CIPHER_CCMP ? 48 : 64; 363 #ifdef CONFIG_IEEE80211R 364 if (wpa_key_mgmt_ft(sm->key_mgmt)) 365 return wpa_derive_ptk_ft(sm, src_addr, key, ptk, ptk_len); 366 #endif /* CONFIG_IEEE80211R */ 367 368 wpa_pmk_to_ptk(sm->pmk, sm->pmk_len, "Pairwise key expansion", 369 sm->own_addr, sm->bssid, sm->snonce, key->key_nonce, 370 (u8 *) ptk, ptk_len, 371 wpa_key_mgmt_sha256(sm->key_mgmt)); 372 return 0; 373 } 374 375 376 static void wpa_supplicant_process_1_of_4(struct wpa_sm *sm, 377 const unsigned char *src_addr, 378 const struct wpa_eapol_key *key, 379 u16 ver) 380 { 381 struct wpa_eapol_ie_parse ie; 382 struct wpa_ptk *ptk; 383 u8 buf[8]; 384 int res; 385 386 if (wpa_sm_get_network_ctx(sm) == NULL) { 387 wpa_printf(MSG_WARNING, "WPA: No SSID info found (msg 1 of " 388 "4)."); 389 return; 390 } 391 392 wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE); 393 wpa_printf(MSG_DEBUG, "WPA: RX message 1 of 4-Way Handshake from " 394 MACSTR " (ver=%d)", MAC2STR(src_addr), ver); 395 396 os_memset(&ie, 0, sizeof(ie)); 397 398 #ifndef CONFIG_NO_WPA2 399 if (sm->proto == WPA_PROTO_RSN) { 400 /* RSN: msg 1/4 should contain PMKID for the selected PMK */ 401 const u8 *_buf = (const u8 *) (key + 1); 402 size_t len = WPA_GET_BE16(key->key_data_length); 403 wpa_hexdump(MSG_DEBUG, "RSN: msg 1/4 key data", _buf, len); 404 wpa_supplicant_parse_ies(_buf, len, &ie); 405 if (ie.pmkid) { 406 wpa_hexdump(MSG_DEBUG, "RSN: PMKID from " 407 "Authenticator", ie.pmkid, PMKID_LEN); 408 } 409 } 410 #endif /* CONFIG_NO_WPA2 */ 411 412 res = wpa_supplicant_get_pmk(sm, src_addr, ie.pmkid); 413 if (res == -2) { 414 wpa_printf(MSG_DEBUG, "RSN: Do not reply to msg 1/4 - " 415 "requesting full EAP authentication"); 416 return; 417 } 418 if (res) 419 goto failed; 420 421 if (sm->renew_snonce) { 422 if (os_get_random(sm->snonce, WPA_NONCE_LEN)) { 423 wpa_msg(sm->ctx->ctx, MSG_WARNING, 424 "WPA: Failed to get random data for SNonce"); 425 goto failed; 426 } 427 sm->renew_snonce = 0; 428 wpa_hexdump(MSG_DEBUG, "WPA: Renewed SNonce", 429 sm->snonce, WPA_NONCE_LEN); 430 } 431 432 /* Calculate PTK which will be stored as a temporary PTK until it has 433 * been verified when processing message 3/4. */ 434 ptk = &sm->tptk; 435 wpa_derive_ptk(sm, src_addr, key, ptk); 436 /* Supplicant: swap tx/rx Mic keys */ 437 os_memcpy(buf, ptk->u.auth.tx_mic_key, 8); 438 os_memcpy(ptk->u.auth.tx_mic_key, ptk->u.auth.rx_mic_key, 8); 439 os_memcpy(ptk->u.auth.rx_mic_key, buf, 8); 440 sm->tptk_set = 1; 441 442 if (wpa_supplicant_send_2_of_4(sm, sm->bssid, key, ver, sm->snonce, 443 sm->assoc_wpa_ie, sm->assoc_wpa_ie_len, 444 ptk)) 445 goto failed; 446 447 os_memcpy(sm->anonce, key->key_nonce, WPA_NONCE_LEN); 448 return; 449 450 failed: 451 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED); 452 } 453 454 455 static void wpa_sm_start_preauth(void *eloop_ctx, void *timeout_ctx) 456 { 457 struct wpa_sm *sm = eloop_ctx; 458 rsn_preauth_candidate_process(sm); 459 } 460 461 462 static void wpa_supplicant_key_neg_complete(struct wpa_sm *sm, 463 const u8 *addr, int secure) 464 { 465 wpa_msg(sm->ctx->ctx, MSG_INFO, "WPA: Key negotiation completed with " 466 MACSTR " [PTK=%s GTK=%s]", MAC2STR(addr), 467 wpa_cipher_txt(sm->pairwise_cipher), 468 wpa_cipher_txt(sm->group_cipher)); 469 wpa_sm_cancel_auth_timeout(sm); 470 wpa_sm_set_state(sm, WPA_COMPLETED); 471 472 if (secure) { 473 wpa_sm_mlme_setprotection( 474 sm, addr, MLME_SETPROTECTION_PROTECT_TYPE_RX_TX, 475 MLME_SETPROTECTION_KEY_TYPE_PAIRWISE); 476 eapol_sm_notify_portValid(sm->eapol, TRUE); 477 if (wpa_key_mgmt_wpa_psk(sm->key_mgmt)) 478 eapol_sm_notify_eap_success(sm->eapol, TRUE); 479 /* 480 * Start preauthentication after a short wait to avoid a 481 * possible race condition between the data receive and key 482 * configuration after the 4-Way Handshake. This increases the 483 * likelyhood of the first preauth EAPOL-Start frame getting to 484 * the target AP. 485 */ 486 eloop_register_timeout(1, 0, wpa_sm_start_preauth, sm, NULL); 487 } 488 489 if (sm->cur_pmksa && sm->cur_pmksa->opportunistic) { 490 wpa_printf(MSG_DEBUG, "RSN: Authenticator accepted " 491 "opportunistic PMKSA entry - marking it valid"); 492 sm->cur_pmksa->opportunistic = 0; 493 } 494 495 #ifdef CONFIG_IEEE80211R 496 if (wpa_key_mgmt_ft(sm->key_mgmt)) { 497 /* Prepare for the next transition */ 498 wpa_ft_prepare_auth_request(sm); 499 } 500 #endif /* CONFIG_IEEE80211R */ 501 } 502 503 504 static void wpa_sm_rekey_ptk(void *eloop_ctx, void *timeout_ctx) 505 { 506 struct wpa_sm *sm = eloop_ctx; 507 wpa_printf(MSG_DEBUG, "WPA: Request PTK rekeying"); 508 wpa_sm_key_request(sm, 0, 1); 509 } 510 511 512 static int wpa_supplicant_install_ptk(struct wpa_sm *sm, 513 const struct wpa_eapol_key *key) 514 { 515 int keylen, rsclen; 516 wpa_alg alg; 517 const u8 *key_rsc; 518 u8 null_rsc[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 519 520 wpa_printf(MSG_DEBUG, "WPA: Installing PTK to the driver."); 521 522 switch (sm->pairwise_cipher) { 523 case WPA_CIPHER_CCMP: 524 alg = WPA_ALG_CCMP; 525 keylen = 16; 526 rsclen = 6; 527 break; 528 case WPA_CIPHER_TKIP: 529 alg = WPA_ALG_TKIP; 530 keylen = 32; 531 rsclen = 6; 532 break; 533 case WPA_CIPHER_NONE: 534 wpa_printf(MSG_DEBUG, "WPA: Pairwise Cipher Suite: " 535 "NONE - do not use pairwise keys"); 536 return 0; 537 default: 538 wpa_printf(MSG_WARNING, "WPA: Unsupported pairwise cipher %d", 539 sm->pairwise_cipher); 540 return -1; 541 } 542 543 if (sm->proto == WPA_PROTO_RSN) { 544 key_rsc = null_rsc; 545 } else { 546 key_rsc = key->key_rsc; 547 wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, rsclen); 548 } 549 550 if (wpa_sm_set_key(sm, alg, sm->bssid, 0, 1, key_rsc, rsclen, 551 (u8 *) sm->ptk.tk1, keylen) < 0) { 552 wpa_printf(MSG_WARNING, "WPA: Failed to set PTK to the " 553 "driver (alg=%d keylen=%d bssid=" MACSTR ")", 554 alg, keylen, MAC2STR(sm->bssid)); 555 return -1; 556 } 557 558 if (sm->wpa_ptk_rekey) { 559 eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL); 560 eloop_register_timeout(sm->wpa_ptk_rekey, 0, wpa_sm_rekey_ptk, 561 sm, NULL); 562 } 563 564 return 0; 565 } 566 567 568 static int wpa_supplicant_check_group_cipher(int group_cipher, 569 int keylen, int maxkeylen, 570 int *key_rsc_len, wpa_alg *alg) 571 { 572 int ret = 0; 573 574 switch (group_cipher) { 575 case WPA_CIPHER_CCMP: 576 if (keylen != 16 || maxkeylen < 16) { 577 ret = -1; 578 break; 579 } 580 *key_rsc_len = 6; 581 *alg = WPA_ALG_CCMP; 582 break; 583 case WPA_CIPHER_TKIP: 584 if (keylen != 32 || maxkeylen < 32) { 585 ret = -1; 586 break; 587 } 588 *key_rsc_len = 6; 589 *alg = WPA_ALG_TKIP; 590 break; 591 case WPA_CIPHER_WEP104: 592 if (keylen != 13 || maxkeylen < 13) { 593 ret = -1; 594 break; 595 } 596 *key_rsc_len = 0; 597 *alg = WPA_ALG_WEP; 598 break; 599 case WPA_CIPHER_WEP40: 600 if (keylen != 5 || maxkeylen < 5) { 601 ret = -1; 602 break; 603 } 604 *key_rsc_len = 0; 605 *alg = WPA_ALG_WEP; 606 break; 607 default: 608 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d", 609 group_cipher); 610 return -1; 611 } 612 613 if (ret < 0 ) { 614 wpa_printf(MSG_WARNING, "WPA: Unsupported %s Group Cipher key " 615 "length %d (%d).", 616 wpa_cipher_txt(group_cipher), keylen, maxkeylen); 617 } 618 619 return ret; 620 } 621 622 623 struct wpa_gtk_data { 624 wpa_alg alg; 625 int tx, key_rsc_len, keyidx; 626 u8 gtk[32]; 627 int gtk_len; 628 }; 629 630 631 static int wpa_supplicant_install_gtk(struct wpa_sm *sm, 632 const struct wpa_gtk_data *gd, 633 const u8 *key_rsc) 634 { 635 const u8 *_gtk = gd->gtk; 636 u8 gtk_buf[32]; 637 638 wpa_hexdump_key(MSG_DEBUG, "WPA: Group Key", gd->gtk, gd->gtk_len); 639 wpa_printf(MSG_DEBUG, "WPA: Installing GTK to the driver " 640 "(keyidx=%d tx=%d len=%d).", gd->keyidx, gd->tx, 641 gd->gtk_len); 642 wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, gd->key_rsc_len); 643 if (sm->group_cipher == WPA_CIPHER_TKIP) { 644 /* Swap Tx/Rx keys for Michael MIC */ 645 os_memcpy(gtk_buf, gd->gtk, 16); 646 os_memcpy(gtk_buf + 16, gd->gtk + 24, 8); 647 os_memcpy(gtk_buf + 24, gd->gtk + 16, 8); 648 _gtk = gtk_buf; 649 } 650 if (sm->pairwise_cipher == WPA_CIPHER_NONE) { 651 if (wpa_sm_set_key(sm, gd->alg, 652 (u8 *) "\xff\xff\xff\xff\xff\xff", 653 gd->keyidx, 1, key_rsc, gd->key_rsc_len, 654 _gtk, gd->gtk_len) < 0) { 655 wpa_printf(MSG_WARNING, "WPA: Failed to set " 656 "GTK to the driver (Group only)."); 657 return -1; 658 } 659 } else if (wpa_sm_set_key(sm, gd->alg, 660 (u8 *) "\xff\xff\xff\xff\xff\xff", 661 gd->keyidx, gd->tx, key_rsc, gd->key_rsc_len, 662 _gtk, gd->gtk_len) < 0) { 663 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to " 664 "the driver (alg=%d keylen=%d keyidx=%d)", 665 gd->alg, gd->gtk_len, gd->keyidx); 666 return -1; 667 } 668 669 return 0; 670 } 671 672 673 static int wpa_supplicant_gtk_tx_bit_workaround(const struct wpa_sm *sm, 674 int tx) 675 { 676 if (tx && sm->pairwise_cipher != WPA_CIPHER_NONE) { 677 /* Ignore Tx bit for GTK if a pairwise key is used. One AP 678 * seemed to set this bit (incorrectly, since Tx is only when 679 * doing Group Key only APs) and without this workaround, the 680 * data connection does not work because wpa_supplicant 681 * configured non-zero keyidx to be used for unicast. */ 682 wpa_printf(MSG_INFO, "WPA: Tx bit set for GTK, but pairwise " 683 "keys are used - ignore Tx bit"); 684 return 0; 685 } 686 return tx; 687 } 688 689 690 static int wpa_supplicant_pairwise_gtk(struct wpa_sm *sm, 691 const struct wpa_eapol_key *key, 692 const u8 *gtk, size_t gtk_len, 693 int key_info) 694 { 695 #ifndef CONFIG_NO_WPA2 696 struct wpa_gtk_data gd; 697 698 /* 699 * IEEE Std 802.11i-2004 - 8.5.2 EAPOL-Key frames - Figure 43x 700 * GTK KDE format: 701 * KeyID[bits 0-1], Tx [bit 2], Reserved [bits 3-7] 702 * Reserved [bits 0-7] 703 * GTK 704 */ 705 706 os_memset(&gd, 0, sizeof(gd)); 707 wpa_hexdump_key(MSG_DEBUG, "RSN: received GTK in pairwise handshake", 708 gtk, gtk_len); 709 710 if (gtk_len < 2 || gtk_len - 2 > sizeof(gd.gtk)) 711 return -1; 712 713 gd.keyidx = gtk[0] & 0x3; 714 gd.tx = wpa_supplicant_gtk_tx_bit_workaround(sm, 715 !!(gtk[0] & BIT(2))); 716 gtk += 2; 717 gtk_len -= 2; 718 719 os_memcpy(gd.gtk, gtk, gtk_len); 720 gd.gtk_len = gtk_len; 721 722 if (wpa_supplicant_check_group_cipher(sm->group_cipher, 723 gtk_len, gtk_len, 724 &gd.key_rsc_len, &gd.alg) || 725 wpa_supplicant_install_gtk(sm, &gd, key->key_rsc)) { 726 wpa_printf(MSG_DEBUG, "RSN: Failed to install GTK"); 727 return -1; 728 } 729 730 wpa_supplicant_key_neg_complete(sm, sm->bssid, 731 key_info & WPA_KEY_INFO_SECURE); 732 return 0; 733 #else /* CONFIG_NO_WPA2 */ 734 return -1; 735 #endif /* CONFIG_NO_WPA2 */ 736 } 737 738 739 static int ieee80211w_set_keys(struct wpa_sm *sm, 740 struct wpa_eapol_ie_parse *ie) 741 { 742 #ifdef CONFIG_IEEE80211W 743 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC) 744 return 0; 745 746 if (ie->igtk) { 747 const struct wpa_igtk_kde *igtk; 748 u16 keyidx; 749 if (ie->igtk_len != sizeof(*igtk)) 750 return -1; 751 igtk = (const struct wpa_igtk_kde *) ie->igtk; 752 keyidx = WPA_GET_LE16(igtk->keyid); 753 wpa_printf(MSG_DEBUG, "WPA: IGTK keyid %d " 754 "pn %02x%02x%02x%02x%02x%02x", 755 keyidx, MAC2STR(igtk->pn)); 756 wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK", 757 igtk->igtk, WPA_IGTK_LEN); 758 if (keyidx > 4095) { 759 wpa_printf(MSG_WARNING, "WPA: Invalid IGTK KeyID %d", 760 keyidx); 761 return -1; 762 } 763 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, 764 (u8 *) "\xff\xff\xff\xff\xff\xff", 765 keyidx, 0, igtk->pn, sizeof(igtk->pn), 766 igtk->igtk, WPA_IGTK_LEN) < 0) { 767 wpa_printf(MSG_WARNING, "WPA: Failed to configure IGTK" 768 " to the driver"); 769 return -1; 770 } 771 } 772 773 return 0; 774 #else /* CONFIG_IEEE80211W */ 775 return 0; 776 #endif /* CONFIG_IEEE80211W */ 777 } 778 779 780 static void wpa_report_ie_mismatch(struct wpa_sm *sm, 781 const char *reason, const u8 *src_addr, 782 const u8 *wpa_ie, size_t wpa_ie_len, 783 const u8 *rsn_ie, size_t rsn_ie_len) 784 { 785 wpa_msg(sm->ctx->ctx, MSG_WARNING, "WPA: %s (src=" MACSTR ")", 786 reason, MAC2STR(src_addr)); 787 788 if (sm->ap_wpa_ie) { 789 wpa_hexdump(MSG_INFO, "WPA: WPA IE in Beacon/ProbeResp", 790 sm->ap_wpa_ie, sm->ap_wpa_ie_len); 791 } 792 if (wpa_ie) { 793 if (!sm->ap_wpa_ie) { 794 wpa_printf(MSG_INFO, "WPA: No WPA IE in " 795 "Beacon/ProbeResp"); 796 } 797 wpa_hexdump(MSG_INFO, "WPA: WPA IE in 3/4 msg", 798 wpa_ie, wpa_ie_len); 799 } 800 801 if (sm->ap_rsn_ie) { 802 wpa_hexdump(MSG_INFO, "WPA: RSN IE in Beacon/ProbeResp", 803 sm->ap_rsn_ie, sm->ap_rsn_ie_len); 804 } 805 if (rsn_ie) { 806 if (!sm->ap_rsn_ie) { 807 wpa_printf(MSG_INFO, "WPA: No RSN IE in " 808 "Beacon/ProbeResp"); 809 } 810 wpa_hexdump(MSG_INFO, "WPA: RSN IE in 3/4 msg", 811 rsn_ie, rsn_ie_len); 812 } 813 814 wpa_sm_disassociate(sm, WLAN_REASON_IE_IN_4WAY_DIFFERS); 815 } 816 817 818 static int wpa_supplicant_validate_ie(struct wpa_sm *sm, 819 const unsigned char *src_addr, 820 struct wpa_eapol_ie_parse *ie) 821 { 822 if (sm->ap_wpa_ie == NULL && sm->ap_rsn_ie == NULL) { 823 wpa_printf(MSG_DEBUG, "WPA: No WPA/RSN IE for this AP known. " 824 "Trying to get from scan results"); 825 if (wpa_sm_get_beacon_ie(sm) < 0) { 826 wpa_printf(MSG_WARNING, "WPA: Could not find AP from " 827 "the scan results"); 828 } else { 829 wpa_printf(MSG_DEBUG, "WPA: Found the current AP from " 830 "updated scan results"); 831 } 832 } 833 834 if (ie->wpa_ie == NULL && ie->rsn_ie == NULL && 835 (sm->ap_wpa_ie || sm->ap_rsn_ie)) { 836 wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match " 837 "with IE in Beacon/ProbeResp (no IE?)", 838 src_addr, ie->wpa_ie, ie->wpa_ie_len, 839 ie->rsn_ie, ie->rsn_ie_len); 840 return -1; 841 } 842 843 if ((ie->wpa_ie && sm->ap_wpa_ie && 844 (ie->wpa_ie_len != sm->ap_wpa_ie_len || 845 os_memcmp(ie->wpa_ie, sm->ap_wpa_ie, ie->wpa_ie_len) != 0)) || 846 (ie->rsn_ie && sm->ap_rsn_ie && 847 (ie->rsn_ie_len != sm->ap_rsn_ie_len || 848 os_memcmp(ie->rsn_ie, sm->ap_rsn_ie, ie->rsn_ie_len) != 0))) { 849 wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match " 850 "with IE in Beacon/ProbeResp", 851 src_addr, ie->wpa_ie, ie->wpa_ie_len, 852 ie->rsn_ie, ie->rsn_ie_len); 853 return -1; 854 } 855 856 if (sm->proto == WPA_PROTO_WPA && 857 ie->rsn_ie && sm->ap_rsn_ie == NULL && sm->rsn_enabled) { 858 wpa_report_ie_mismatch(sm, "Possible downgrade attack " 859 "detected - RSN was enabled and RSN IE " 860 "was in msg 3/4, but not in " 861 "Beacon/ProbeResp", 862 src_addr, ie->wpa_ie, ie->wpa_ie_len, 863 ie->rsn_ie, ie->rsn_ie_len); 864 return -1; 865 } 866 867 #ifdef CONFIG_IEEE80211R 868 if (wpa_key_mgmt_ft(sm->key_mgmt)) { 869 struct rsn_mdie *mdie; 870 /* TODO: verify that full MDIE matches with the one from scan 871 * results, not only mobility domain */ 872 mdie = (struct rsn_mdie *) (ie->mdie + 2); 873 if (ie->mdie == NULL || ie->mdie_len < 2 + sizeof(*mdie) || 874 os_memcmp(mdie->mobility_domain, sm->mobility_domain, 875 MOBILITY_DOMAIN_ID_LEN) != 0) { 876 wpa_printf(MSG_DEBUG, "FT: MDIE in msg 3/4 did not " 877 "match with the current mobility domain"); 878 return -1; 879 } 880 } 881 #endif /* CONFIG_IEEE80211R */ 882 883 return 0; 884 } 885 886 887 /** 888 * wpa_supplicant_send_4_of_4 - Send message 4 of WPA/RSN 4-Way Handshake 889 * @sm: Pointer to WPA state machine data from wpa_sm_init() 890 * @dst: Destination address for the frame 891 * @key: Pointer to the EAPOL-Key frame header 892 * @ver: Version bits from EAPOL-Key Key Info 893 * @key_info: Key Info 894 * @kde: KDEs to include the EAPOL-Key frame 895 * @kde_len: Length of KDEs 896 * @ptk: PTK to use for keyed hash and encryption 897 * Returns: 0 on success, -1 on failure 898 */ 899 int wpa_supplicant_send_4_of_4(struct wpa_sm *sm, const unsigned char *dst, 900 const struct wpa_eapol_key *key, 901 u16 ver, u16 key_info, 902 const u8 *kde, size_t kde_len, 903 struct wpa_ptk *ptk) 904 { 905 size_t rlen; 906 struct wpa_eapol_key *reply; 907 u8 *rbuf; 908 909 if (kde) 910 wpa_hexdump(MSG_DEBUG, "WPA: KDE for msg 4/4", kde, kde_len); 911 912 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL, 913 sizeof(*reply) + kde_len, 914 &rlen, (void *) &reply); 915 if (rbuf == NULL) 916 return -1; 917 918 reply->type = sm->proto == WPA_PROTO_RSN ? 919 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; 920 key_info &= WPA_KEY_INFO_SECURE; 921 key_info |= ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_MIC; 922 WPA_PUT_BE16(reply->key_info, key_info); 923 if (sm->proto == WPA_PROTO_RSN) 924 WPA_PUT_BE16(reply->key_length, 0); 925 else 926 os_memcpy(reply->key_length, key->key_length, 2); 927 os_memcpy(reply->replay_counter, key->replay_counter, 928 WPA_REPLAY_COUNTER_LEN); 929 930 WPA_PUT_BE16(reply->key_data_length, kde_len); 931 if (kde) 932 os_memcpy(reply + 1, kde, kde_len); 933 934 wpa_printf(MSG_DEBUG, "WPA: Sending EAPOL-Key 4/4"); 935 wpa_eapol_key_send(sm, ptk->kck, ver, dst, ETH_P_EAPOL, 936 rbuf, rlen, reply->key_mic); 937 938 return 0; 939 } 940 941 942 static void wpa_supplicant_process_3_of_4(struct wpa_sm *sm, 943 const struct wpa_eapol_key *key, 944 u16 ver) 945 { 946 u16 key_info, keylen, len; 947 const u8 *pos; 948 struct wpa_eapol_ie_parse ie; 949 950 wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE); 951 wpa_printf(MSG_DEBUG, "WPA: RX message 3 of 4-Way Handshake from " 952 MACSTR " (ver=%d)", MAC2STR(sm->bssid), ver); 953 954 key_info = WPA_GET_BE16(key->key_info); 955 956 pos = (const u8 *) (key + 1); 957 len = WPA_GET_BE16(key->key_data_length); 958 wpa_hexdump(MSG_DEBUG, "WPA: IE KeyData", pos, len); 959 wpa_supplicant_parse_ies(pos, len, &ie); 960 if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) { 961 wpa_printf(MSG_WARNING, "WPA: GTK IE in unencrypted key data"); 962 goto failed; 963 } 964 #ifdef CONFIG_IEEE80211W 965 if (ie.igtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) { 966 wpa_printf(MSG_WARNING, "WPA: IGTK KDE in unencrypted key " 967 "data"); 968 goto failed; 969 } 970 971 if (ie.igtk && ie.igtk_len != sizeof(struct wpa_igtk_kde)) { 972 wpa_printf(MSG_WARNING, "WPA: Invalid IGTK KDE length %lu", 973 (unsigned long) ie.igtk_len); 974 goto failed; 975 } 976 #endif /* CONFIG_IEEE80211W */ 977 978 if (wpa_supplicant_validate_ie(sm, sm->bssid, &ie) < 0) 979 goto failed; 980 981 if (os_memcmp(sm->anonce, key->key_nonce, WPA_NONCE_LEN) != 0) { 982 wpa_printf(MSG_WARNING, "WPA: ANonce from message 1 of 4-Way " 983 "Handshake differs from 3 of 4-Way Handshake - drop" 984 " packet (src=" MACSTR ")", MAC2STR(sm->bssid)); 985 goto failed; 986 } 987 988 keylen = WPA_GET_BE16(key->key_length); 989 switch (sm->pairwise_cipher) { 990 case WPA_CIPHER_CCMP: 991 if (keylen != 16) { 992 wpa_printf(MSG_WARNING, "WPA: Invalid CCMP key length " 993 "%d (src=" MACSTR ")", 994 keylen, MAC2STR(sm->bssid)); 995 goto failed; 996 } 997 break; 998 case WPA_CIPHER_TKIP: 999 if (keylen != 32) { 1000 wpa_printf(MSG_WARNING, "WPA: Invalid TKIP key length " 1001 "%d (src=" MACSTR ")", 1002 keylen, MAC2STR(sm->bssid)); 1003 goto failed; 1004 } 1005 break; 1006 } 1007 1008 if (wpa_supplicant_send_4_of_4(sm, sm->bssid, key, ver, key_info, 1009 NULL, 0, &sm->ptk)) { 1010 goto failed; 1011 } 1012 1013 /* SNonce was successfully used in msg 3/4, so mark it to be renewed 1014 * for the next 4-Way Handshake. If msg 3 is received again, the old 1015 * SNonce will still be used to avoid changing PTK. */ 1016 sm->renew_snonce = 1; 1017 1018 if (key_info & WPA_KEY_INFO_INSTALL) { 1019 if (wpa_supplicant_install_ptk(sm, key)) 1020 goto failed; 1021 } 1022 1023 if (key_info & WPA_KEY_INFO_SECURE) { 1024 wpa_sm_mlme_setprotection( 1025 sm, sm->bssid, MLME_SETPROTECTION_PROTECT_TYPE_RX, 1026 MLME_SETPROTECTION_KEY_TYPE_PAIRWISE); 1027 eapol_sm_notify_portValid(sm->eapol, TRUE); 1028 } 1029 wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE); 1030 1031 if (ie.gtk && 1032 wpa_supplicant_pairwise_gtk(sm, key, 1033 ie.gtk, ie.gtk_len, key_info) < 0) { 1034 wpa_printf(MSG_INFO, "RSN: Failed to configure GTK"); 1035 goto failed; 1036 } 1037 1038 if (ieee80211w_set_keys(sm, &ie) < 0) { 1039 wpa_printf(MSG_INFO, "RSN: Failed to configure IGTK"); 1040 goto failed; 1041 } 1042 1043 return; 1044 1045 failed: 1046 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED); 1047 } 1048 1049 1050 static int wpa_supplicant_process_1_of_2_rsn(struct wpa_sm *sm, 1051 const u8 *keydata, 1052 size_t keydatalen, 1053 u16 key_info, 1054 struct wpa_gtk_data *gd) 1055 { 1056 int maxkeylen; 1057 struct wpa_eapol_ie_parse ie; 1058 1059 wpa_hexdump(MSG_DEBUG, "RSN: msg 1/2 key data", keydata, keydatalen); 1060 wpa_supplicant_parse_ies(keydata, keydatalen, &ie); 1061 if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) { 1062 wpa_printf(MSG_WARNING, "WPA: GTK IE in unencrypted key data"); 1063 return -1; 1064 } 1065 if (ie.gtk == NULL) { 1066 wpa_printf(MSG_INFO, "WPA: No GTK IE in Group Key msg 1/2"); 1067 return -1; 1068 } 1069 maxkeylen = gd->gtk_len = ie.gtk_len - 2; 1070 1071 if (wpa_supplicant_check_group_cipher(sm->group_cipher, 1072 gd->gtk_len, maxkeylen, 1073 &gd->key_rsc_len, &gd->alg)) 1074 return -1; 1075 1076 wpa_hexdump(MSG_DEBUG, "RSN: received GTK in group key handshake", 1077 ie.gtk, ie.gtk_len); 1078 gd->keyidx = ie.gtk[0] & 0x3; 1079 gd->tx = wpa_supplicant_gtk_tx_bit_workaround(sm, 1080 !!(ie.gtk[0] & BIT(2))); 1081 if (ie.gtk_len - 2 > sizeof(gd->gtk)) { 1082 wpa_printf(MSG_INFO, "RSN: Too long GTK in GTK IE " 1083 "(len=%lu)", (unsigned long) ie.gtk_len - 2); 1084 return -1; 1085 } 1086 os_memcpy(gd->gtk, ie.gtk + 2, ie.gtk_len - 2); 1087 1088 if (ieee80211w_set_keys(sm, &ie) < 0) 1089 wpa_printf(MSG_INFO, "RSN: Failed to configure IGTK"); 1090 1091 return 0; 1092 } 1093 1094 1095 static int wpa_supplicant_process_1_of_2_wpa(struct wpa_sm *sm, 1096 const struct wpa_eapol_key *key, 1097 size_t keydatalen, int key_info, 1098 size_t extra_len, u16 ver, 1099 struct wpa_gtk_data *gd) 1100 { 1101 size_t maxkeylen; 1102 u8 ek[32]; 1103 1104 gd->gtk_len = WPA_GET_BE16(key->key_length); 1105 maxkeylen = keydatalen; 1106 if (keydatalen > extra_len) { 1107 wpa_printf(MSG_INFO, "WPA: Truncated EAPOL-Key packet:" 1108 " key_data_length=%lu > extra_len=%lu", 1109 (unsigned long) keydatalen, 1110 (unsigned long) extra_len); 1111 return -1; 1112 } 1113 if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 1114 if (maxkeylen < 8) { 1115 wpa_printf(MSG_INFO, "WPA: Too short maxkeylen (%lu)", 1116 (unsigned long) maxkeylen); 1117 return -1; 1118 } 1119 maxkeylen -= 8; 1120 } 1121 1122 if (wpa_supplicant_check_group_cipher(sm->group_cipher, 1123 gd->gtk_len, maxkeylen, 1124 &gd->key_rsc_len, &gd->alg)) 1125 return -1; 1126 1127 gd->keyidx = (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >> 1128 WPA_KEY_INFO_KEY_INDEX_SHIFT; 1129 if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4) { 1130 os_memcpy(ek, key->key_iv, 16); 1131 os_memcpy(ek + 16, sm->ptk.kek, 16); 1132 if (keydatalen > sizeof(gd->gtk)) { 1133 wpa_printf(MSG_WARNING, "WPA: RC4 key data " 1134 "too long (%lu)", 1135 (unsigned long) keydatalen); 1136 return -1; 1137 } 1138 os_memcpy(gd->gtk, key + 1, keydatalen); 1139 rc4_skip(ek, 32, 256, gd->gtk, keydatalen); 1140 } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 1141 if (keydatalen % 8) { 1142 wpa_printf(MSG_WARNING, "WPA: Unsupported AES-WRAP " 1143 "len %lu", (unsigned long) keydatalen); 1144 return -1; 1145 } 1146 if (maxkeylen > sizeof(gd->gtk)) { 1147 wpa_printf(MSG_WARNING, "WPA: AES-WRAP key data " 1148 "too long (keydatalen=%lu maxkeylen=%lu)", 1149 (unsigned long) keydatalen, 1150 (unsigned long) maxkeylen); 1151 return -1; 1152 } 1153 if (aes_unwrap(sm->ptk.kek, maxkeylen / 8, 1154 (const u8 *) (key + 1), gd->gtk)) { 1155 wpa_printf(MSG_WARNING, "WPA: AES unwrap " 1156 "failed - could not decrypt GTK"); 1157 return -1; 1158 } 1159 } else { 1160 wpa_printf(MSG_WARNING, "WPA: Unsupported key_info type %d", 1161 ver); 1162 return -1; 1163 } 1164 gd->tx = wpa_supplicant_gtk_tx_bit_workaround( 1165 sm, !!(key_info & WPA_KEY_INFO_TXRX)); 1166 return 0; 1167 } 1168 1169 1170 static int wpa_supplicant_send_2_of_2(struct wpa_sm *sm, 1171 const struct wpa_eapol_key *key, 1172 int ver, u16 key_info) 1173 { 1174 size_t rlen; 1175 struct wpa_eapol_key *reply; 1176 u8 *rbuf; 1177 1178 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL, 1179 sizeof(*reply), &rlen, (void *) &reply); 1180 if (rbuf == NULL) 1181 return -1; 1182 1183 reply->type = sm->proto == WPA_PROTO_RSN ? 1184 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; 1185 key_info &= WPA_KEY_INFO_KEY_INDEX_MASK; 1186 key_info |= ver | WPA_KEY_INFO_MIC | WPA_KEY_INFO_SECURE; 1187 WPA_PUT_BE16(reply->key_info, key_info); 1188 if (sm->proto == WPA_PROTO_RSN) 1189 WPA_PUT_BE16(reply->key_length, 0); 1190 else 1191 os_memcpy(reply->key_length, key->key_length, 2); 1192 os_memcpy(reply->replay_counter, key->replay_counter, 1193 WPA_REPLAY_COUNTER_LEN); 1194 1195 WPA_PUT_BE16(reply->key_data_length, 0); 1196 1197 wpa_printf(MSG_DEBUG, "WPA: Sending EAPOL-Key 2/2"); 1198 wpa_eapol_key_send(sm, sm->ptk.kck, ver, sm->bssid, ETH_P_EAPOL, 1199 rbuf, rlen, reply->key_mic); 1200 1201 return 0; 1202 } 1203 1204 1205 static void wpa_supplicant_process_1_of_2(struct wpa_sm *sm, 1206 const unsigned char *src_addr, 1207 const struct wpa_eapol_key *key, 1208 int extra_len, u16 ver) 1209 { 1210 u16 key_info, keydatalen; 1211 int rekey, ret; 1212 struct wpa_gtk_data gd; 1213 1214 os_memset(&gd, 0, sizeof(gd)); 1215 1216 rekey = wpa_sm_get_state(sm) == WPA_COMPLETED; 1217 wpa_printf(MSG_DEBUG, "WPA: RX message 1 of Group Key Handshake from " 1218 MACSTR " (ver=%d)", MAC2STR(src_addr), ver); 1219 1220 key_info = WPA_GET_BE16(key->key_info); 1221 keydatalen = WPA_GET_BE16(key->key_data_length); 1222 1223 if (sm->proto == WPA_PROTO_RSN) { 1224 ret = wpa_supplicant_process_1_of_2_rsn(sm, 1225 (const u8 *) (key + 1), 1226 keydatalen, key_info, 1227 &gd); 1228 } else { 1229 ret = wpa_supplicant_process_1_of_2_wpa(sm, key, keydatalen, 1230 key_info, extra_len, 1231 ver, &gd); 1232 } 1233 1234 wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE); 1235 1236 if (ret) 1237 goto failed; 1238 1239 if (wpa_supplicant_install_gtk(sm, &gd, key->key_rsc) || 1240 wpa_supplicant_send_2_of_2(sm, key, ver, key_info)) 1241 goto failed; 1242 1243 if (rekey) { 1244 wpa_msg(sm->ctx->ctx, MSG_INFO, "WPA: Group rekeying " 1245 "completed with " MACSTR " [GTK=%s]", 1246 MAC2STR(sm->bssid), wpa_cipher_txt(sm->group_cipher)); 1247 wpa_sm_cancel_auth_timeout(sm); 1248 wpa_sm_set_state(sm, WPA_COMPLETED); 1249 } else { 1250 wpa_supplicant_key_neg_complete(sm, sm->bssid, 1251 key_info & 1252 WPA_KEY_INFO_SECURE); 1253 } 1254 return; 1255 1256 failed: 1257 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED); 1258 } 1259 1260 1261 static int wpa_supplicant_verify_eapol_key_mic(struct wpa_sm *sm, 1262 struct wpa_eapol_key *key, 1263 u16 ver, 1264 const u8 *buf, size_t len) 1265 { 1266 u8 mic[16]; 1267 int ok = 0; 1268 1269 os_memcpy(mic, key->key_mic, 16); 1270 if (sm->tptk_set) { 1271 os_memset(key->key_mic, 0, 16); 1272 wpa_eapol_key_mic(sm->tptk.kck, ver, buf, len, 1273 key->key_mic); 1274 if (os_memcmp(mic, key->key_mic, 16) != 0) { 1275 wpa_printf(MSG_WARNING, "WPA: Invalid EAPOL-Key MIC " 1276 "when using TPTK - ignoring TPTK"); 1277 } else { 1278 ok = 1; 1279 sm->tptk_set = 0; 1280 sm->ptk_set = 1; 1281 os_memcpy(&sm->ptk, &sm->tptk, sizeof(sm->ptk)); 1282 } 1283 } 1284 1285 if (!ok && sm->ptk_set) { 1286 os_memset(key->key_mic, 0, 16); 1287 wpa_eapol_key_mic(sm->ptk.kck, ver, buf, len, 1288 key->key_mic); 1289 if (os_memcmp(mic, key->key_mic, 16) != 0) { 1290 wpa_printf(MSG_WARNING, "WPA: Invalid EAPOL-Key MIC " 1291 "- dropping packet"); 1292 return -1; 1293 } 1294 ok = 1; 1295 } 1296 1297 if (!ok) { 1298 wpa_printf(MSG_WARNING, "WPA: Could not verify EAPOL-Key MIC " 1299 "- dropping packet"); 1300 return -1; 1301 } 1302 1303 os_memcpy(sm->rx_replay_counter, key->replay_counter, 1304 WPA_REPLAY_COUNTER_LEN); 1305 sm->rx_replay_counter_set = 1; 1306 return 0; 1307 } 1308 1309 1310 /* Decrypt RSN EAPOL-Key key data (RC4 or AES-WRAP) */ 1311 static int wpa_supplicant_decrypt_key_data(struct wpa_sm *sm, 1312 struct wpa_eapol_key *key, u16 ver) 1313 { 1314 u16 keydatalen = WPA_GET_BE16(key->key_data_length); 1315 1316 wpa_hexdump(MSG_DEBUG, "RSN: encrypted key data", 1317 (u8 *) (key + 1), keydatalen); 1318 if (!sm->ptk_set) { 1319 wpa_printf(MSG_WARNING, "WPA: PTK not available, " 1320 "cannot decrypt EAPOL-Key key data."); 1321 return -1; 1322 } 1323 1324 /* Decrypt key data here so that this operation does not need 1325 * to be implemented separately for each message type. */ 1326 if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4) { 1327 u8 ek[32]; 1328 os_memcpy(ek, key->key_iv, 16); 1329 os_memcpy(ek + 16, sm->ptk.kek, 16); 1330 rc4_skip(ek, 32, 256, (u8 *) (key + 1), keydatalen); 1331 } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES || 1332 ver == WPA_KEY_INFO_TYPE_AES_128_CMAC) { 1333 u8 *buf; 1334 if (keydatalen % 8) { 1335 wpa_printf(MSG_WARNING, "WPA: Unsupported " 1336 "AES-WRAP len %d", keydatalen); 1337 return -1; 1338 } 1339 keydatalen -= 8; /* AES-WRAP adds 8 bytes */ 1340 buf = os_malloc(keydatalen); 1341 if (buf == NULL) { 1342 wpa_printf(MSG_WARNING, "WPA: No memory for " 1343 "AES-UNWRAP buffer"); 1344 return -1; 1345 } 1346 if (aes_unwrap(sm->ptk.kek, keydatalen / 8, 1347 (u8 *) (key + 1), buf)) { 1348 os_free(buf); 1349 wpa_printf(MSG_WARNING, "WPA: AES unwrap failed - " 1350 "could not decrypt EAPOL-Key key data"); 1351 return -1; 1352 } 1353 os_memcpy(key + 1, buf, keydatalen); 1354 os_free(buf); 1355 WPA_PUT_BE16(key->key_data_length, keydatalen); 1356 } else { 1357 wpa_printf(MSG_WARNING, "WPA: Unsupported key_info type %d", 1358 ver); 1359 return -1; 1360 } 1361 wpa_hexdump_key(MSG_DEBUG, "WPA: decrypted EAPOL-Key key data", 1362 (u8 *) (key + 1), keydatalen); 1363 return 0; 1364 } 1365 1366 1367 /** 1368 * wpa_sm_aborted_cached - Notify WPA that PMKSA caching was aborted 1369 * @sm: Pointer to WPA state machine data from wpa_sm_init() 1370 */ 1371 void wpa_sm_aborted_cached(struct wpa_sm *sm) 1372 { 1373 if (sm && sm->cur_pmksa) { 1374 wpa_printf(MSG_DEBUG, "RSN: Cancelling PMKSA caching attempt"); 1375 sm->cur_pmksa = NULL; 1376 } 1377 } 1378 1379 1380 static void wpa_eapol_key_dump(const struct wpa_eapol_key *key) 1381 { 1382 #ifndef CONFIG_NO_STDOUT_DEBUG 1383 u16 key_info = WPA_GET_BE16(key->key_info); 1384 1385 wpa_printf(MSG_DEBUG, " EAPOL-Key type=%d", key->type); 1386 wpa_printf(MSG_DEBUG, " key_info 0x%x (ver=%d keyidx=%d rsvd=%d %s" 1387 "%s%s%s%s%s%s%s)", 1388 key_info, key_info & WPA_KEY_INFO_TYPE_MASK, 1389 (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >> 1390 WPA_KEY_INFO_KEY_INDEX_SHIFT, 1391 (key_info & (BIT(13) | BIT(14) | BIT(15))) >> 13, 1392 key_info & WPA_KEY_INFO_KEY_TYPE ? "Pairwise" : "Group", 1393 key_info & WPA_KEY_INFO_INSTALL ? " Install" : "", 1394 key_info & WPA_KEY_INFO_ACK ? " Ack" : "", 1395 key_info & WPA_KEY_INFO_MIC ? " MIC" : "", 1396 key_info & WPA_KEY_INFO_SECURE ? " Secure" : "", 1397 key_info & WPA_KEY_INFO_ERROR ? " Error" : "", 1398 key_info & WPA_KEY_INFO_REQUEST ? " Request" : "", 1399 key_info & WPA_KEY_INFO_ENCR_KEY_DATA ? " Encr" : ""); 1400 wpa_printf(MSG_DEBUG, " key_length=%u key_data_length=%u", 1401 WPA_GET_BE16(key->key_length), 1402 WPA_GET_BE16(key->key_data_length)); 1403 wpa_hexdump(MSG_DEBUG, " replay_counter", 1404 key->replay_counter, WPA_REPLAY_COUNTER_LEN); 1405 wpa_hexdump(MSG_DEBUG, " key_nonce", key->key_nonce, WPA_NONCE_LEN); 1406 wpa_hexdump(MSG_DEBUG, " key_iv", key->key_iv, 16); 1407 wpa_hexdump(MSG_DEBUG, " key_rsc", key->key_rsc, 8); 1408 wpa_hexdump(MSG_DEBUG, " key_id (reserved)", key->key_id, 8); 1409 wpa_hexdump(MSG_DEBUG, " key_mic", key->key_mic, 16); 1410 #endif /* CONFIG_NO_STDOUT_DEBUG */ 1411 } 1412 1413 1414 /** 1415 * wpa_sm_rx_eapol - Process received WPA EAPOL frames 1416 * @sm: Pointer to WPA state machine data from wpa_sm_init() 1417 * @src_addr: Source MAC address of the EAPOL packet 1418 * @buf: Pointer to the beginning of the EAPOL data (EAPOL header) 1419 * @len: Length of the EAPOL frame 1420 * Returns: 1 = WPA EAPOL-Key processed, 0 = not a WPA EAPOL-Key, -1 failure 1421 * 1422 * This function is called for each received EAPOL frame. Other than EAPOL-Key 1423 * frames can be skipped if filtering is done elsewhere. wpa_sm_rx_eapol() is 1424 * only processing WPA and WPA2 EAPOL-Key frames. 1425 * 1426 * The received EAPOL-Key packets are validated and valid packets are replied 1427 * to. In addition, key material (PTK, GTK) is configured at the end of a 1428 * successful key handshake. 1429 */ 1430 int wpa_sm_rx_eapol(struct wpa_sm *sm, const u8 *src_addr, 1431 const u8 *buf, size_t len) 1432 { 1433 size_t plen, data_len, extra_len; 1434 struct ieee802_1x_hdr *hdr; 1435 struct wpa_eapol_key *key; 1436 u16 key_info, ver; 1437 u8 *tmp; 1438 int ret = -1; 1439 struct wpa_peerkey *peerkey = NULL; 1440 1441 #ifdef CONFIG_IEEE80211R 1442 sm->ft_completed = 0; 1443 #endif /* CONFIG_IEEE80211R */ 1444 1445 if (len < sizeof(*hdr) + sizeof(*key)) { 1446 wpa_printf(MSG_DEBUG, "WPA: EAPOL frame too short to be a WPA " 1447 "EAPOL-Key (len %lu, expecting at least %lu)", 1448 (unsigned long) len, 1449 (unsigned long) sizeof(*hdr) + sizeof(*key)); 1450 return 0; 1451 } 1452 1453 tmp = os_malloc(len); 1454 if (tmp == NULL) 1455 return -1; 1456 os_memcpy(tmp, buf, len); 1457 1458 hdr = (struct ieee802_1x_hdr *) tmp; 1459 key = (struct wpa_eapol_key *) (hdr + 1); 1460 plen = be_to_host16(hdr->length); 1461 data_len = plen + sizeof(*hdr); 1462 wpa_printf(MSG_DEBUG, "IEEE 802.1X RX: version=%d type=%d length=%lu", 1463 hdr->version, hdr->type, (unsigned long) plen); 1464 1465 if (hdr->version < EAPOL_VERSION) { 1466 /* TODO: backwards compatibility */ 1467 } 1468 if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) { 1469 wpa_printf(MSG_DEBUG, "WPA: EAPOL frame (type %u) discarded, " 1470 "not a Key frame", hdr->type); 1471 ret = 0; 1472 goto out; 1473 } 1474 if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) { 1475 wpa_printf(MSG_DEBUG, "WPA: EAPOL frame payload size %lu " 1476 "invalid (frame size %lu)", 1477 (unsigned long) plen, (unsigned long) len); 1478 ret = 0; 1479 goto out; 1480 } 1481 1482 if (key->type != EAPOL_KEY_TYPE_WPA && key->type != EAPOL_KEY_TYPE_RSN) 1483 { 1484 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key type (%d) unknown, " 1485 "discarded", key->type); 1486 ret = 0; 1487 goto out; 1488 } 1489 wpa_eapol_key_dump(key); 1490 1491 eapol_sm_notify_lower_layer_success(sm->eapol, 0); 1492 wpa_hexdump(MSG_MSGDUMP, "WPA: RX EAPOL-Key", tmp, len); 1493 if (data_len < len) { 1494 wpa_printf(MSG_DEBUG, "WPA: ignoring %lu bytes after the IEEE " 1495 "802.1X data", (unsigned long) len - data_len); 1496 } 1497 key_info = WPA_GET_BE16(key->key_info); 1498 ver = key_info & WPA_KEY_INFO_TYPE_MASK; 1499 if (ver != WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 && 1500 #if defined(CONFIG_IEEE80211R) || defined(CONFIG_IEEE80211W) 1501 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC && 1502 #endif /* CONFIG_IEEE80211R || CONFIG_IEEE80211W */ 1503 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 1504 wpa_printf(MSG_INFO, "WPA: Unsupported EAPOL-Key descriptor " 1505 "version %d.", ver); 1506 goto out; 1507 } 1508 1509 #ifdef CONFIG_IEEE80211R 1510 if (wpa_key_mgmt_ft(sm->key_mgmt)) { 1511 /* IEEE 802.11r uses a new key_info type (AES-128-CMAC). */ 1512 if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) { 1513 wpa_printf(MSG_INFO, "FT: AP did not use " 1514 "AES-128-CMAC."); 1515 goto out; 1516 } 1517 } else 1518 #endif /* CONFIG_IEEE80211R */ 1519 #ifdef CONFIG_IEEE80211W 1520 if (wpa_key_mgmt_sha256(sm->key_mgmt)) { 1521 if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) { 1522 wpa_printf(MSG_INFO, "WPA: AP did not use the " 1523 "negotiated AES-128-CMAC."); 1524 goto out; 1525 } 1526 } else 1527 #endif /* CONFIG_IEEE80211W */ 1528 if (sm->pairwise_cipher == WPA_CIPHER_CCMP && 1529 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 1530 wpa_printf(MSG_INFO, "WPA: CCMP is used, but EAPOL-Key " 1531 "descriptor version (%d) is not 2.", ver); 1532 if (sm->group_cipher != WPA_CIPHER_CCMP && 1533 !(key_info & WPA_KEY_INFO_KEY_TYPE)) { 1534 /* Earlier versions of IEEE 802.11i did not explicitly 1535 * require version 2 descriptor for all EAPOL-Key 1536 * packets, so allow group keys to use version 1 if 1537 * CCMP is not used for them. */ 1538 wpa_printf(MSG_INFO, "WPA: Backwards compatibility: " 1539 "allow invalid version for non-CCMP group " 1540 "keys"); 1541 } else 1542 goto out; 1543 } 1544 1545 #ifdef CONFIG_PEERKEY 1546 for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) { 1547 if (os_memcmp(peerkey->addr, src_addr, ETH_ALEN) == 0) 1548 break; 1549 } 1550 1551 if (!(key_info & WPA_KEY_INFO_SMK_MESSAGE) && peerkey) { 1552 if (!peerkey->initiator && peerkey->replay_counter_set && 1553 os_memcmp(key->replay_counter, peerkey->replay_counter, 1554 WPA_REPLAY_COUNTER_LEN) <= 0) { 1555 wpa_printf(MSG_WARNING, "RSN: EAPOL-Key Replay " 1556 "Counter did not increase (STK) - dropping " 1557 "packet"); 1558 goto out; 1559 } else if (peerkey->initiator) { 1560 u8 _tmp[WPA_REPLAY_COUNTER_LEN]; 1561 os_memcpy(_tmp, key->replay_counter, 1562 WPA_REPLAY_COUNTER_LEN); 1563 inc_byte_array(_tmp, WPA_REPLAY_COUNTER_LEN); 1564 if (os_memcmp(_tmp, peerkey->replay_counter, 1565 WPA_REPLAY_COUNTER_LEN) != 0) { 1566 wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key Replay " 1567 "Counter did not match (STK) - " 1568 "dropping packet"); 1569 goto out; 1570 } 1571 } 1572 } 1573 1574 if (peerkey && peerkey->initiator && (key_info & WPA_KEY_INFO_ACK)) { 1575 wpa_printf(MSG_INFO, "RSN: Ack bit in key_info from STK peer"); 1576 goto out; 1577 } 1578 #endif /* CONFIG_PEERKEY */ 1579 1580 if (!peerkey && sm->rx_replay_counter_set && 1581 os_memcmp(key->replay_counter, sm->rx_replay_counter, 1582 WPA_REPLAY_COUNTER_LEN) <= 0) { 1583 wpa_printf(MSG_WARNING, "WPA: EAPOL-Key Replay Counter did not" 1584 " increase - dropping packet"); 1585 goto out; 1586 } 1587 1588 if (!(key_info & (WPA_KEY_INFO_ACK | WPA_KEY_INFO_SMK_MESSAGE)) 1589 #ifdef CONFIG_PEERKEY 1590 && (peerkey == NULL || !peerkey->initiator) 1591 #endif /* CONFIG_PEERKEY */ 1592 ) { 1593 wpa_printf(MSG_INFO, "WPA: No Ack bit in key_info"); 1594 goto out; 1595 } 1596 1597 if (key_info & WPA_KEY_INFO_REQUEST) { 1598 wpa_printf(MSG_INFO, "WPA: EAPOL-Key with Request bit - " 1599 "dropped"); 1600 goto out; 1601 } 1602 1603 if ((key_info & WPA_KEY_INFO_MIC) && !peerkey && 1604 wpa_supplicant_verify_eapol_key_mic(sm, key, ver, tmp, data_len)) 1605 goto out; 1606 1607 #ifdef CONFIG_PEERKEY 1608 if ((key_info & WPA_KEY_INFO_MIC) && peerkey && 1609 peerkey_verify_eapol_key_mic(sm, peerkey, key, ver, tmp, data_len)) 1610 goto out; 1611 #endif /* CONFIG_PEERKEY */ 1612 1613 extra_len = data_len - sizeof(*hdr) - sizeof(*key); 1614 1615 if (WPA_GET_BE16(key->key_data_length) > extra_len) { 1616 wpa_msg(sm->ctx->ctx, MSG_INFO, "WPA: Invalid EAPOL-Key " 1617 "frame - key_data overflow (%d > %lu)", 1618 WPA_GET_BE16(key->key_data_length), 1619 (unsigned long) extra_len); 1620 goto out; 1621 } 1622 extra_len = WPA_GET_BE16(key->key_data_length); 1623 1624 if (sm->proto == WPA_PROTO_RSN && 1625 (key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) { 1626 if (wpa_supplicant_decrypt_key_data(sm, key, ver)) 1627 goto out; 1628 extra_len = WPA_GET_BE16(key->key_data_length); 1629 } 1630 1631 if (key_info & WPA_KEY_INFO_KEY_TYPE) { 1632 if (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) { 1633 wpa_printf(MSG_WARNING, "WPA: Ignored EAPOL-Key " 1634 "(Pairwise) with non-zero key index"); 1635 goto out; 1636 } 1637 if (peerkey) { 1638 /* PeerKey 4-Way Handshake */ 1639 peerkey_rx_eapol_4way(sm, peerkey, key, key_info, ver); 1640 } else if (key_info & WPA_KEY_INFO_MIC) { 1641 /* 3/4 4-Way Handshake */ 1642 wpa_supplicant_process_3_of_4(sm, key, ver); 1643 } else { 1644 /* 1/4 4-Way Handshake */ 1645 wpa_supplicant_process_1_of_4(sm, src_addr, key, 1646 ver); 1647 } 1648 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) { 1649 /* PeerKey SMK Handshake */ 1650 peerkey_rx_eapol_smk(sm, src_addr, key, extra_len, key_info, 1651 ver); 1652 } else { 1653 if (key_info & WPA_KEY_INFO_MIC) { 1654 /* 1/2 Group Key Handshake */ 1655 wpa_supplicant_process_1_of_2(sm, src_addr, key, 1656 extra_len, ver); 1657 } else { 1658 wpa_printf(MSG_WARNING, "WPA: EAPOL-Key (Group) " 1659 "without Mic bit - dropped"); 1660 } 1661 } 1662 1663 ret = 1; 1664 1665 out: 1666 os_free(tmp); 1667 return ret; 1668 } 1669 1670 1671 #ifdef CONFIG_CTRL_IFACE 1672 static int wpa_cipher_bits(int cipher) 1673 { 1674 switch (cipher) { 1675 case WPA_CIPHER_CCMP: 1676 return 128; 1677 case WPA_CIPHER_TKIP: 1678 return 256; 1679 case WPA_CIPHER_WEP104: 1680 return 104; 1681 case WPA_CIPHER_WEP40: 1682 return 40; 1683 default: 1684 return 0; 1685 } 1686 } 1687 1688 1689 static u32 wpa_key_mgmt_suite(struct wpa_sm *sm) 1690 { 1691 switch (sm->key_mgmt) { 1692 case WPA_KEY_MGMT_IEEE8021X: 1693 return (sm->proto == WPA_PROTO_RSN ? 1694 RSN_AUTH_KEY_MGMT_UNSPEC_802_1X : 1695 WPA_AUTH_KEY_MGMT_UNSPEC_802_1X); 1696 case WPA_KEY_MGMT_PSK: 1697 return (sm->proto == WPA_PROTO_RSN ? 1698 RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X : 1699 WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X); 1700 #ifdef CONFIG_IEEE80211R 1701 case WPA_KEY_MGMT_FT_IEEE8021X: 1702 return RSN_AUTH_KEY_MGMT_FT_802_1X; 1703 case WPA_KEY_MGMT_FT_PSK: 1704 return RSN_AUTH_KEY_MGMT_FT_PSK; 1705 #endif /* CONFIG_IEEE80211R */ 1706 #ifdef CONFIG_IEEE80211W 1707 case WPA_KEY_MGMT_IEEE8021X_SHA256: 1708 return RSN_AUTH_KEY_MGMT_802_1X_SHA256; 1709 case WPA_KEY_MGMT_PSK_SHA256: 1710 return RSN_AUTH_KEY_MGMT_PSK_SHA256; 1711 #endif /* CONFIG_IEEE80211W */ 1712 case WPA_KEY_MGMT_WPA_NONE: 1713 return WPA_AUTH_KEY_MGMT_NONE; 1714 default: 1715 return 0; 1716 } 1717 } 1718 1719 1720 static u32 wpa_cipher_suite(struct wpa_sm *sm, int cipher) 1721 { 1722 switch (cipher) { 1723 case WPA_CIPHER_CCMP: 1724 return (sm->proto == WPA_PROTO_RSN ? 1725 RSN_CIPHER_SUITE_CCMP : WPA_CIPHER_SUITE_CCMP); 1726 case WPA_CIPHER_TKIP: 1727 return (sm->proto == WPA_PROTO_RSN ? 1728 RSN_CIPHER_SUITE_TKIP : WPA_CIPHER_SUITE_TKIP); 1729 case WPA_CIPHER_WEP104: 1730 return (sm->proto == WPA_PROTO_RSN ? 1731 RSN_CIPHER_SUITE_WEP104 : WPA_CIPHER_SUITE_WEP104); 1732 case WPA_CIPHER_WEP40: 1733 return (sm->proto == WPA_PROTO_RSN ? 1734 RSN_CIPHER_SUITE_WEP40 : WPA_CIPHER_SUITE_WEP40); 1735 case WPA_CIPHER_NONE: 1736 return (sm->proto == WPA_PROTO_RSN ? 1737 RSN_CIPHER_SUITE_NONE : WPA_CIPHER_SUITE_NONE); 1738 default: 1739 return 0; 1740 } 1741 } 1742 1743 1744 #define RSN_SUITE "%02x-%02x-%02x-%d" 1745 #define RSN_SUITE_ARG(s) \ 1746 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff 1747 1748 /** 1749 * wpa_sm_get_mib - Dump text list of MIB entries 1750 * @sm: Pointer to WPA state machine data from wpa_sm_init() 1751 * @buf: Buffer for the list 1752 * @buflen: Length of the buffer 1753 * Returns: Number of bytes written to buffer 1754 * 1755 * This function is used fetch dot11 MIB variables. 1756 */ 1757 int wpa_sm_get_mib(struct wpa_sm *sm, char *buf, size_t buflen) 1758 { 1759 char pmkid_txt[PMKID_LEN * 2 + 1]; 1760 int rsna, ret; 1761 size_t len; 1762 1763 if (sm->cur_pmksa) { 1764 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt), 1765 sm->cur_pmksa->pmkid, PMKID_LEN); 1766 } else 1767 pmkid_txt[0] = '\0'; 1768 1769 if ((wpa_key_mgmt_wpa_psk(sm->key_mgmt) || 1770 wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt)) && 1771 sm->proto == WPA_PROTO_RSN) 1772 rsna = 1; 1773 else 1774 rsna = 0; 1775 1776 ret = os_snprintf(buf, buflen, 1777 "dot11RSNAOptionImplemented=TRUE\n" 1778 "dot11RSNAPreauthenticationImplemented=TRUE\n" 1779 "dot11RSNAEnabled=%s\n" 1780 "dot11RSNAPreauthenticationEnabled=%s\n" 1781 "dot11RSNAConfigVersion=%d\n" 1782 "dot11RSNAConfigPairwiseKeysSupported=5\n" 1783 "dot11RSNAConfigGroupCipherSize=%d\n" 1784 "dot11RSNAConfigPMKLifetime=%d\n" 1785 "dot11RSNAConfigPMKReauthThreshold=%d\n" 1786 "dot11RSNAConfigNumberOfPTKSAReplayCounters=1\n" 1787 "dot11RSNAConfigSATimeout=%d\n", 1788 rsna ? "TRUE" : "FALSE", 1789 rsna ? "TRUE" : "FALSE", 1790 RSN_VERSION, 1791 wpa_cipher_bits(sm->group_cipher), 1792 sm->dot11RSNAConfigPMKLifetime, 1793 sm->dot11RSNAConfigPMKReauthThreshold, 1794 sm->dot11RSNAConfigSATimeout); 1795 if (ret < 0 || (size_t) ret >= buflen) 1796 return 0; 1797 len = ret; 1798 1799 ret = os_snprintf( 1800 buf + len, buflen - len, 1801 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n" 1802 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n" 1803 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n" 1804 "dot11RSNAPMKIDUsed=%s\n" 1805 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n" 1806 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n" 1807 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n" 1808 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n" 1809 "dot11RSNA4WayHandshakeFailures=%u\n", 1810 RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)), 1811 RSN_SUITE_ARG(wpa_cipher_suite(sm, sm->pairwise_cipher)), 1812 RSN_SUITE_ARG(wpa_cipher_suite(sm, sm->group_cipher)), 1813 pmkid_txt, 1814 RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)), 1815 RSN_SUITE_ARG(wpa_cipher_suite(sm, sm->pairwise_cipher)), 1816 RSN_SUITE_ARG(wpa_cipher_suite(sm, sm->group_cipher)), 1817 sm->dot11RSNA4WayHandshakeFailures); 1818 if (ret >= 0 && (size_t) ret < buflen) 1819 len += ret; 1820 1821 return (int) len; 1822 } 1823 #endif /* CONFIG_CTRL_IFACE */ 1824 1825 1826 static void wpa_sm_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry, 1827 void *ctx, int replace) 1828 { 1829 struct wpa_sm *sm = ctx; 1830 1831 if (sm->cur_pmksa == entry || 1832 (sm->pmk_len == entry->pmk_len && 1833 os_memcmp(sm->pmk, entry->pmk, sm->pmk_len) == 0)) { 1834 wpa_printf(MSG_DEBUG, "RSN: removed current PMKSA entry"); 1835 sm->cur_pmksa = NULL; 1836 1837 if (replace) { 1838 /* A new entry is being added, so no need to 1839 * deauthenticate in this case. This happens when EAP 1840 * authentication is completed again (reauth or failed 1841 * PMKSA caching attempt). */ 1842 return; 1843 } 1844 1845 os_memset(sm->pmk, 0, sizeof(sm->pmk)); 1846 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED); 1847 } 1848 } 1849 1850 1851 /** 1852 * wpa_sm_init - Initialize WPA state machine 1853 * @ctx: Context pointer for callbacks; this needs to be an allocated buffer 1854 * Returns: Pointer to the allocated WPA state machine data 1855 * 1856 * This function is used to allocate a new WPA state machine and the returned 1857 * value is passed to all WPA state machine calls. 1858 */ 1859 struct wpa_sm * wpa_sm_init(struct wpa_sm_ctx *ctx) 1860 { 1861 struct wpa_sm *sm; 1862 1863 sm = os_zalloc(sizeof(*sm)); 1864 if (sm == NULL) 1865 return NULL; 1866 sm->renew_snonce = 1; 1867 sm->ctx = ctx; 1868 1869 sm->dot11RSNAConfigPMKLifetime = 43200; 1870 sm->dot11RSNAConfigPMKReauthThreshold = 70; 1871 sm->dot11RSNAConfigSATimeout = 60; 1872 1873 sm->pmksa = pmksa_cache_init(wpa_sm_pmksa_free_cb, sm, sm); 1874 if (sm->pmksa == NULL) { 1875 wpa_printf(MSG_ERROR, "RSN: PMKSA cache initialization " 1876 "failed"); 1877 os_free(sm); 1878 return NULL; 1879 } 1880 1881 return sm; 1882 } 1883 1884 1885 /** 1886 * wpa_sm_deinit - Deinitialize WPA state machine 1887 * @sm: Pointer to WPA state machine data from wpa_sm_init() 1888 */ 1889 void wpa_sm_deinit(struct wpa_sm *sm) 1890 { 1891 if (sm == NULL) 1892 return; 1893 pmksa_cache_deinit(sm->pmksa); 1894 eloop_cancel_timeout(wpa_sm_start_preauth, sm, NULL); 1895 eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL); 1896 os_free(sm->assoc_wpa_ie); 1897 os_free(sm->ap_wpa_ie); 1898 os_free(sm->ap_rsn_ie); 1899 os_free(sm->ctx); 1900 peerkey_deinit(sm); 1901 os_free(sm); 1902 } 1903 1904 1905 /** 1906 * wpa_sm_notify_assoc - Notify WPA state machine about association 1907 * @sm: Pointer to WPA state machine data from wpa_sm_init() 1908 * @bssid: The BSSID of the new association 1909 * 1910 * This function is called to let WPA state machine know that the connection 1911 * was established. 1912 */ 1913 void wpa_sm_notify_assoc(struct wpa_sm *sm, const u8 *bssid) 1914 { 1915 int clear_ptk = 1; 1916 1917 if (sm == NULL) 1918 return; 1919 1920 wpa_printf(MSG_DEBUG, "WPA: Association event - clear replay counter"); 1921 os_memcpy(sm->bssid, bssid, ETH_ALEN); 1922 os_memset(sm->rx_replay_counter, 0, WPA_REPLAY_COUNTER_LEN); 1923 sm->rx_replay_counter_set = 0; 1924 sm->renew_snonce = 1; 1925 if (os_memcmp(sm->preauth_bssid, bssid, ETH_ALEN) == 0) 1926 rsn_preauth_deinit(sm); 1927 1928 #ifdef CONFIG_IEEE80211R 1929 if (wpa_ft_is_completed(sm)) { 1930 wpa_supplicant_key_neg_complete(sm, sm->bssid, 1); 1931 1932 /* Prepare for the next transition */ 1933 wpa_ft_prepare_auth_request(sm); 1934 1935 clear_ptk = 0; 1936 } 1937 #endif /* CONFIG_IEEE80211R */ 1938 1939 if (clear_ptk) { 1940 /* 1941 * IEEE 802.11, 8.4.10: Delete PTK SA on (re)association if 1942 * this is not part of a Fast BSS Transition. 1943 */ 1944 wpa_printf(MSG_DEBUG, "WPA: Clear old PTK"); 1945 sm->ptk_set = 0; 1946 sm->tptk_set = 0; 1947 } 1948 } 1949 1950 1951 /** 1952 * wpa_sm_notify_disassoc - Notify WPA state machine about disassociation 1953 * @sm: Pointer to WPA state machine data from wpa_sm_init() 1954 * 1955 * This function is called to let WPA state machine know that the connection 1956 * was lost. This will abort any existing pre-authentication session. 1957 */ 1958 void wpa_sm_notify_disassoc(struct wpa_sm *sm) 1959 { 1960 rsn_preauth_deinit(sm); 1961 if (wpa_sm_get_state(sm) == WPA_4WAY_HANDSHAKE) 1962 sm->dot11RSNA4WayHandshakeFailures++; 1963 } 1964 1965 1966 /** 1967 * wpa_sm_set_pmk - Set PMK 1968 * @sm: Pointer to WPA state machine data from wpa_sm_init() 1969 * @pmk: The new PMK 1970 * @pmk_len: The length of the new PMK in bytes 1971 * 1972 * Configure the PMK for WPA state machine. 1973 */ 1974 void wpa_sm_set_pmk(struct wpa_sm *sm, const u8 *pmk, size_t pmk_len) 1975 { 1976 if (sm == NULL) 1977 return; 1978 1979 sm->pmk_len = pmk_len; 1980 os_memcpy(sm->pmk, pmk, pmk_len); 1981 1982 #ifdef CONFIG_IEEE80211R 1983 /* Set XXKey to be PSK for FT key derivation */ 1984 sm->xxkey_len = pmk_len; 1985 os_memcpy(sm->xxkey, pmk, pmk_len); 1986 #endif /* CONFIG_IEEE80211R */ 1987 } 1988 1989 1990 /** 1991 * wpa_sm_set_pmk_from_pmksa - Set PMK based on the current PMKSA 1992 * @sm: Pointer to WPA state machine data from wpa_sm_init() 1993 * 1994 * Take the PMK from the current PMKSA into use. If no PMKSA is active, the PMK 1995 * will be cleared. 1996 */ 1997 void wpa_sm_set_pmk_from_pmksa(struct wpa_sm *sm) 1998 { 1999 if (sm == NULL) 2000 return; 2001 2002 if (sm->cur_pmksa) { 2003 sm->pmk_len = sm->cur_pmksa->pmk_len; 2004 os_memcpy(sm->pmk, sm->cur_pmksa->pmk, sm->pmk_len); 2005 } else { 2006 sm->pmk_len = PMK_LEN; 2007 os_memset(sm->pmk, 0, PMK_LEN); 2008 } 2009 } 2010 2011 2012 /** 2013 * wpa_sm_set_fast_reauth - Set fast reauthentication (EAP) enabled/disabled 2014 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2015 * @fast_reauth: Whether fast reauthentication (EAP) is allowed 2016 */ 2017 void wpa_sm_set_fast_reauth(struct wpa_sm *sm, int fast_reauth) 2018 { 2019 if (sm) 2020 sm->fast_reauth = fast_reauth; 2021 } 2022 2023 2024 /** 2025 * wpa_sm_set_scard_ctx - Set context pointer for smartcard callbacks 2026 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2027 * @scard_ctx: Context pointer for smartcard related callback functions 2028 */ 2029 void wpa_sm_set_scard_ctx(struct wpa_sm *sm, void *scard_ctx) 2030 { 2031 if (sm == NULL) 2032 return; 2033 sm->scard_ctx = scard_ctx; 2034 if (sm->preauth_eapol) 2035 eapol_sm_register_scard_ctx(sm->preauth_eapol, scard_ctx); 2036 } 2037 2038 2039 /** 2040 * wpa_sm_set_config - Notification of current configration change 2041 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2042 * @config: Pointer to current network configuration 2043 * 2044 * Notify WPA state machine that configuration has changed. config will be 2045 * stored as a backpointer to network configuration. This can be %NULL to clear 2046 * the stored pointed. 2047 */ 2048 void wpa_sm_set_config(struct wpa_sm *sm, struct rsn_supp_config *config) 2049 { 2050 if (!sm) 2051 return; 2052 2053 if (config) { 2054 sm->network_ctx = config->network_ctx; 2055 sm->peerkey_enabled = config->peerkey_enabled; 2056 sm->allowed_pairwise_cipher = config->allowed_pairwise_cipher; 2057 sm->proactive_key_caching = config->proactive_key_caching; 2058 sm->eap_workaround = config->eap_workaround; 2059 sm->eap_conf_ctx = config->eap_conf_ctx; 2060 if (config->ssid) { 2061 os_memcpy(sm->ssid, config->ssid, config->ssid_len); 2062 sm->ssid_len = config->ssid_len; 2063 } else 2064 sm->ssid_len = 0; 2065 sm->wpa_ptk_rekey = config->wpa_ptk_rekey; 2066 } else { 2067 sm->network_ctx = NULL; 2068 sm->peerkey_enabled = 0; 2069 sm->allowed_pairwise_cipher = 0; 2070 sm->proactive_key_caching = 0; 2071 sm->eap_workaround = 0; 2072 sm->eap_conf_ctx = NULL; 2073 sm->ssid_len = 0; 2074 sm->wpa_ptk_rekey = 0; 2075 } 2076 if (config == NULL || config->network_ctx != sm->network_ctx) 2077 pmksa_cache_notify_reconfig(sm->pmksa); 2078 } 2079 2080 2081 /** 2082 * wpa_sm_set_own_addr - Set own MAC address 2083 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2084 * @addr: Own MAC address 2085 */ 2086 void wpa_sm_set_own_addr(struct wpa_sm *sm, const u8 *addr) 2087 { 2088 if (sm) 2089 os_memcpy(sm->own_addr, addr, ETH_ALEN); 2090 } 2091 2092 2093 /** 2094 * wpa_sm_set_ifname - Set network interface name 2095 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2096 * @ifname: Interface name 2097 * @bridge_ifname: Optional bridge interface name (for pre-auth) 2098 */ 2099 void wpa_sm_set_ifname(struct wpa_sm *sm, const char *ifname, 2100 const char *bridge_ifname) 2101 { 2102 if (sm) { 2103 sm->ifname = ifname; 2104 sm->bridge_ifname = bridge_ifname; 2105 } 2106 } 2107 2108 2109 /** 2110 * wpa_sm_set_eapol - Set EAPOL state machine pointer 2111 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2112 * @eapol: Pointer to EAPOL state machine allocated with eapol_sm_init() 2113 */ 2114 void wpa_sm_set_eapol(struct wpa_sm *sm, struct eapol_sm *eapol) 2115 { 2116 if (sm) 2117 sm->eapol = eapol; 2118 } 2119 2120 2121 /** 2122 * wpa_sm_set_param - Set WPA state machine parameters 2123 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2124 * @param: Parameter field 2125 * @value: Parameter value 2126 * Returns: 0 on success, -1 on failure 2127 */ 2128 int wpa_sm_set_param(struct wpa_sm *sm, enum wpa_sm_conf_params param, 2129 unsigned int value) 2130 { 2131 int ret = 0; 2132 2133 if (sm == NULL) 2134 return -1; 2135 2136 switch (param) { 2137 case RSNA_PMK_LIFETIME: 2138 if (value > 0) 2139 sm->dot11RSNAConfigPMKLifetime = value; 2140 else 2141 ret = -1; 2142 break; 2143 case RSNA_PMK_REAUTH_THRESHOLD: 2144 if (value > 0 && value <= 100) 2145 sm->dot11RSNAConfigPMKReauthThreshold = value; 2146 else 2147 ret = -1; 2148 break; 2149 case RSNA_SA_TIMEOUT: 2150 if (value > 0) 2151 sm->dot11RSNAConfigSATimeout = value; 2152 else 2153 ret = -1; 2154 break; 2155 case WPA_PARAM_PROTO: 2156 sm->proto = value; 2157 break; 2158 case WPA_PARAM_PAIRWISE: 2159 sm->pairwise_cipher = value; 2160 break; 2161 case WPA_PARAM_GROUP: 2162 sm->group_cipher = value; 2163 break; 2164 case WPA_PARAM_KEY_MGMT: 2165 sm->key_mgmt = value; 2166 break; 2167 #ifdef CONFIG_IEEE80211W 2168 case WPA_PARAM_MGMT_GROUP: 2169 sm->mgmt_group_cipher = value; 2170 break; 2171 #endif /* CONFIG_IEEE80211W */ 2172 case WPA_PARAM_RSN_ENABLED: 2173 sm->rsn_enabled = value; 2174 break; 2175 default: 2176 break; 2177 } 2178 2179 return ret; 2180 } 2181 2182 2183 /** 2184 * wpa_sm_get_param - Get WPA state machine parameters 2185 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2186 * @param: Parameter field 2187 * Returns: Parameter value 2188 */ 2189 unsigned int wpa_sm_get_param(struct wpa_sm *sm, enum wpa_sm_conf_params param) 2190 { 2191 if (sm == NULL) 2192 return 0; 2193 2194 switch (param) { 2195 case RSNA_PMK_LIFETIME: 2196 return sm->dot11RSNAConfigPMKLifetime; 2197 case RSNA_PMK_REAUTH_THRESHOLD: 2198 return sm->dot11RSNAConfigPMKReauthThreshold; 2199 case RSNA_SA_TIMEOUT: 2200 return sm->dot11RSNAConfigSATimeout; 2201 case WPA_PARAM_PROTO: 2202 return sm->proto; 2203 case WPA_PARAM_PAIRWISE: 2204 return sm->pairwise_cipher; 2205 case WPA_PARAM_GROUP: 2206 return sm->group_cipher; 2207 case WPA_PARAM_KEY_MGMT: 2208 return sm->key_mgmt; 2209 #ifdef CONFIG_IEEE80211W 2210 case WPA_PARAM_MGMT_GROUP: 2211 return sm->mgmt_group_cipher; 2212 #endif /* CONFIG_IEEE80211W */ 2213 case WPA_PARAM_RSN_ENABLED: 2214 return sm->rsn_enabled; 2215 default: 2216 return 0; 2217 } 2218 } 2219 2220 2221 /** 2222 * wpa_sm_get_status - Get WPA state machine 2223 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2224 * @buf: Buffer for status information 2225 * @buflen: Maximum buffer length 2226 * @verbose: Whether to include verbose status information 2227 * Returns: Number of bytes written to buf. 2228 * 2229 * Query WPA state machine for status information. This function fills in 2230 * a text area with current status information. If the buffer (buf) is not 2231 * large enough, status information will be truncated to fit the buffer. 2232 */ 2233 int wpa_sm_get_status(struct wpa_sm *sm, char *buf, size_t buflen, 2234 int verbose) 2235 { 2236 char *pos = buf, *end = buf + buflen; 2237 int ret; 2238 2239 ret = os_snprintf(pos, end - pos, 2240 "pairwise_cipher=%s\n" 2241 "group_cipher=%s\n" 2242 "key_mgmt=%s\n", 2243 wpa_cipher_txt(sm->pairwise_cipher), 2244 wpa_cipher_txt(sm->group_cipher), 2245 wpa_key_mgmt_txt(sm->key_mgmt, sm->proto)); 2246 if (ret < 0 || ret >= end - pos) 2247 return pos - buf; 2248 pos += ret; 2249 return pos - buf; 2250 } 2251 2252 2253 /** 2254 * wpa_sm_set_assoc_wpa_ie_default - Generate own WPA/RSN IE from configuration 2255 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2256 * @wpa_ie: Pointer to buffer for WPA/RSN IE 2257 * @wpa_ie_len: Pointer to the length of the wpa_ie buffer 2258 * Returns: 0 on success, -1 on failure 2259 */ 2260 int wpa_sm_set_assoc_wpa_ie_default(struct wpa_sm *sm, u8 *wpa_ie, 2261 size_t *wpa_ie_len) 2262 { 2263 int res; 2264 2265 if (sm == NULL) 2266 return -1; 2267 2268 res = wpa_gen_wpa_ie(sm, wpa_ie, *wpa_ie_len); 2269 if (res < 0) 2270 return -1; 2271 *wpa_ie_len = res; 2272 2273 wpa_hexdump(MSG_DEBUG, "WPA: Set own WPA IE default", 2274 wpa_ie, *wpa_ie_len); 2275 2276 if (sm->assoc_wpa_ie == NULL) { 2277 /* 2278 * Make a copy of the WPA/RSN IE so that 4-Way Handshake gets 2279 * the correct version of the IE even if PMKSA caching is 2280 * aborted (which would remove PMKID from IE generation). 2281 */ 2282 sm->assoc_wpa_ie = os_malloc(*wpa_ie_len); 2283 if (sm->assoc_wpa_ie == NULL) 2284 return -1; 2285 2286 os_memcpy(sm->assoc_wpa_ie, wpa_ie, *wpa_ie_len); 2287 sm->assoc_wpa_ie_len = *wpa_ie_len; 2288 } 2289 2290 return 0; 2291 } 2292 2293 2294 /** 2295 * wpa_sm_set_assoc_wpa_ie - Set own WPA/RSN IE from (Re)AssocReq 2296 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2297 * @ie: Pointer to IE data (starting from id) 2298 * @len: IE length 2299 * Returns: 0 on success, -1 on failure 2300 * 2301 * Inform WPA state machine about the WPA/RSN IE used in (Re)Association 2302 * Request frame. The IE will be used to override the default value generated 2303 * with wpa_sm_set_assoc_wpa_ie_default(). 2304 */ 2305 int wpa_sm_set_assoc_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len) 2306 { 2307 if (sm == NULL) 2308 return -1; 2309 2310 os_free(sm->assoc_wpa_ie); 2311 if (ie == NULL || len == 0) { 2312 wpa_printf(MSG_DEBUG, "WPA: clearing own WPA/RSN IE"); 2313 sm->assoc_wpa_ie = NULL; 2314 sm->assoc_wpa_ie_len = 0; 2315 } else { 2316 wpa_hexdump(MSG_DEBUG, "WPA: set own WPA/RSN IE", ie, len); 2317 sm->assoc_wpa_ie = os_malloc(len); 2318 if (sm->assoc_wpa_ie == NULL) 2319 return -1; 2320 2321 os_memcpy(sm->assoc_wpa_ie, ie, len); 2322 sm->assoc_wpa_ie_len = len; 2323 } 2324 2325 return 0; 2326 } 2327 2328 2329 /** 2330 * wpa_sm_set_ap_wpa_ie - Set AP WPA IE from Beacon/ProbeResp 2331 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2332 * @ie: Pointer to IE data (starting from id) 2333 * @len: IE length 2334 * Returns: 0 on success, -1 on failure 2335 * 2336 * Inform WPA state machine about the WPA IE used in Beacon / Probe Response 2337 * frame. 2338 */ 2339 int wpa_sm_set_ap_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len) 2340 { 2341 if (sm == NULL) 2342 return -1; 2343 2344 os_free(sm->ap_wpa_ie); 2345 if (ie == NULL || len == 0) { 2346 wpa_printf(MSG_DEBUG, "WPA: clearing AP WPA IE"); 2347 sm->ap_wpa_ie = NULL; 2348 sm->ap_wpa_ie_len = 0; 2349 } else { 2350 wpa_hexdump(MSG_DEBUG, "WPA: set AP WPA IE", ie, len); 2351 sm->ap_wpa_ie = os_malloc(len); 2352 if (sm->ap_wpa_ie == NULL) 2353 return -1; 2354 2355 os_memcpy(sm->ap_wpa_ie, ie, len); 2356 sm->ap_wpa_ie_len = len; 2357 } 2358 2359 return 0; 2360 } 2361 2362 2363 /** 2364 * wpa_sm_set_ap_rsn_ie - Set AP RSN IE from Beacon/ProbeResp 2365 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2366 * @ie: Pointer to IE data (starting from id) 2367 * @len: IE length 2368 * Returns: 0 on success, -1 on failure 2369 * 2370 * Inform WPA state machine about the RSN IE used in Beacon / Probe Response 2371 * frame. 2372 */ 2373 int wpa_sm_set_ap_rsn_ie(struct wpa_sm *sm, const u8 *ie, size_t len) 2374 { 2375 if (sm == NULL) 2376 return -1; 2377 2378 os_free(sm->ap_rsn_ie); 2379 if (ie == NULL || len == 0) { 2380 wpa_printf(MSG_DEBUG, "WPA: clearing AP RSN IE"); 2381 sm->ap_rsn_ie = NULL; 2382 sm->ap_rsn_ie_len = 0; 2383 } else { 2384 wpa_hexdump(MSG_DEBUG, "WPA: set AP RSN IE", ie, len); 2385 sm->ap_rsn_ie = os_malloc(len); 2386 if (sm->ap_rsn_ie == NULL) 2387 return -1; 2388 2389 os_memcpy(sm->ap_rsn_ie, ie, len); 2390 sm->ap_rsn_ie_len = len; 2391 } 2392 2393 return 0; 2394 } 2395 2396 2397 /** 2398 * wpa_sm_parse_own_wpa_ie - Parse own WPA/RSN IE 2399 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2400 * @data: Pointer to data area for parsing results 2401 * Returns: 0 on success, -1 if IE is not known, or -2 on parsing failure 2402 * 2403 * Parse the contents of the own WPA or RSN IE from (Re)AssocReq and write the 2404 * parsed data into data. 2405 */ 2406 int wpa_sm_parse_own_wpa_ie(struct wpa_sm *sm, struct wpa_ie_data *data) 2407 { 2408 if (sm == NULL || sm->assoc_wpa_ie == NULL) { 2409 wpa_printf(MSG_DEBUG, "WPA: No WPA/RSN IE available from " 2410 "association info"); 2411 return -1; 2412 } 2413 if (wpa_parse_wpa_ie(sm->assoc_wpa_ie, sm->assoc_wpa_ie_len, data)) 2414 return -2; 2415 return 0; 2416 } 2417
