1 /* 2 * WPA Supplicant - WPA state machine and EAPOL-Key processing 3 * Copyright (c) 2003-2012, Jouni Malinen <j@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/aes_wrap.h" 13 #include "crypto/crypto.h" 14 #include "crypto/random.h" 15 #include "common/ieee802_11_defs.h" 16 #include "eapol_supp/eapol_supp_sm.h" 17 #include "wpa.h" 18 #include "eloop.h" 19 #include "preauth.h" 20 #include "pmksa_cache.h" 21 #include "wpa_i.h" 22 #include "wpa_ie.h" 23 #include "peerkey.h" 24 25 26 /** 27 * wpa_eapol_key_send - Send WPA/RSN EAPOL-Key message 28 * @sm: Pointer to WPA state machine data from wpa_sm_init() 29 * @kck: Key Confirmation Key (KCK, part of PTK) 30 * @ver: Version field from Key Info 31 * @dest: Destination address for the frame 32 * @proto: Ethertype (usually ETH_P_EAPOL) 33 * @msg: EAPOL-Key message 34 * @msg_len: Length of message 35 * @key_mic: Pointer to the buffer to which the EAPOL-Key MIC is written 36 */ 37 void wpa_eapol_key_send(struct wpa_sm *sm, const u8 *kck, 38 int ver, const u8 *dest, u16 proto, 39 u8 *msg, size_t msg_len, u8 *key_mic) 40 { 41 if (is_zero_ether_addr(dest) && is_zero_ether_addr(sm->bssid)) { 42 /* 43 * Association event was not yet received; try to fetch 44 * BSSID from the driver. 45 */ 46 if (wpa_sm_get_bssid(sm, sm->bssid) < 0) { 47 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 48 "WPA: Failed to read BSSID for " 49 "EAPOL-Key destination address"); 50 } else { 51 dest = sm->bssid; 52 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 53 "WPA: Use BSSID (" MACSTR 54 ") as the destination for EAPOL-Key", 55 MAC2STR(dest)); 56 } 57 } 58 if (key_mic && 59 wpa_eapol_key_mic(kck, ver, msg, msg_len, key_mic)) { 60 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR, 61 "WPA: Failed to generate EAPOL-Key " 62 "version %d MIC", ver); 63 goto out; 64 } 65 wpa_hexdump_key(MSG_DEBUG, "WPA: KCK", kck, 16); 66 wpa_hexdump(MSG_DEBUG, "WPA: Derived Key MIC", key_mic, 16); 67 wpa_hexdump(MSG_MSGDUMP, "WPA: TX EAPOL-Key", msg, msg_len); 68 wpa_sm_ether_send(sm, dest, proto, msg, msg_len); 69 eapol_sm_notify_tx_eapol_key(sm->eapol); 70 out: 71 os_free(msg); 72 } 73 74 75 /** 76 * wpa_sm_key_request - Send EAPOL-Key Request 77 * @sm: Pointer to WPA state machine data from wpa_sm_init() 78 * @error: Indicate whether this is an Michael MIC error report 79 * @pairwise: 1 = error report for pairwise packet, 0 = for group packet 80 * 81 * Send an EAPOL-Key Request to the current authenticator. This function is 82 * used to request rekeying and it is usually called when a local Michael MIC 83 * failure is detected. 84 */ 85 void wpa_sm_key_request(struct wpa_sm *sm, int error, int pairwise) 86 { 87 size_t rlen; 88 struct wpa_eapol_key *reply; 89 int key_info, ver; 90 u8 bssid[ETH_ALEN], *rbuf; 91 92 if (wpa_key_mgmt_ft(sm->key_mgmt) || wpa_key_mgmt_sha256(sm->key_mgmt)) 93 ver = WPA_KEY_INFO_TYPE_AES_128_CMAC; 94 else if (sm->pairwise_cipher != WPA_CIPHER_TKIP) 95 ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES; 96 else 97 ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4; 98 99 if (wpa_sm_get_bssid(sm, bssid) < 0) { 100 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 101 "Failed to read BSSID for EAPOL-Key request"); 102 return; 103 } 104 105 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL, 106 sizeof(*reply), &rlen, (void *) &reply); 107 if (rbuf == NULL) 108 return; 109 110 reply->type = sm->proto == WPA_PROTO_RSN ? 111 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; 112 key_info = WPA_KEY_INFO_REQUEST | ver; 113 if (sm->ptk_set) 114 key_info |= WPA_KEY_INFO_MIC; 115 if (error) 116 key_info |= WPA_KEY_INFO_ERROR; 117 if (pairwise) 118 key_info |= WPA_KEY_INFO_KEY_TYPE; 119 WPA_PUT_BE16(reply->key_info, key_info); 120 WPA_PUT_BE16(reply->key_length, 0); 121 os_memcpy(reply->replay_counter, sm->request_counter, 122 WPA_REPLAY_COUNTER_LEN); 123 inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN); 124 125 WPA_PUT_BE16(reply->key_data_length, 0); 126 127 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 128 "WPA: Sending EAPOL-Key Request (error=%d " 129 "pairwise=%d ptk_set=%d len=%lu)", 130 error, pairwise, sm->ptk_set, (unsigned long) rlen); 131 wpa_eapol_key_send(sm, sm->ptk.kck, ver, bssid, ETH_P_EAPOL, 132 rbuf, rlen, key_info & WPA_KEY_INFO_MIC ? 133 reply->key_mic : NULL); 134 } 135 136 137 static int wpa_supplicant_get_pmk(struct wpa_sm *sm, 138 const unsigned char *src_addr, 139 const u8 *pmkid) 140 { 141 int abort_cached = 0; 142 143 if (pmkid && !sm->cur_pmksa) { 144 /* When using drivers that generate RSN IE, wpa_supplicant may 145 * not have enough time to get the association information 146 * event before receiving this 1/4 message, so try to find a 147 * matching PMKSA cache entry here. */ 148 sm->cur_pmksa = pmksa_cache_get(sm->pmksa, src_addr, pmkid, 149 NULL); 150 if (sm->cur_pmksa) { 151 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 152 "RSN: found matching PMKID from PMKSA cache"); 153 } else { 154 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 155 "RSN: no matching PMKID found"); 156 abort_cached = 1; 157 } 158 } 159 160 if (pmkid && sm->cur_pmksa && 161 os_memcmp(pmkid, sm->cur_pmksa->pmkid, PMKID_LEN) == 0) { 162 wpa_hexdump(MSG_DEBUG, "RSN: matched PMKID", pmkid, PMKID_LEN); 163 wpa_sm_set_pmk_from_pmksa(sm); 164 wpa_hexdump_key(MSG_DEBUG, "RSN: PMK from PMKSA cache", 165 sm->pmk, sm->pmk_len); 166 eapol_sm_notify_cached(sm->eapol); 167 #ifdef CONFIG_IEEE80211R 168 sm->xxkey_len = 0; 169 #endif /* CONFIG_IEEE80211R */ 170 } else if (wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt) && sm->eapol) { 171 int res, pmk_len; 172 pmk_len = PMK_LEN; 173 res = eapol_sm_get_key(sm->eapol, sm->pmk, PMK_LEN); 174 if (res) { 175 /* 176 * EAP-LEAP is an exception from other EAP methods: it 177 * uses only 16-byte PMK. 178 */ 179 res = eapol_sm_get_key(sm->eapol, sm->pmk, 16); 180 pmk_len = 16; 181 } else { 182 #ifdef CONFIG_IEEE80211R 183 u8 buf[2 * PMK_LEN]; 184 if (eapol_sm_get_key(sm->eapol, buf, 2 * PMK_LEN) == 0) 185 { 186 os_memcpy(sm->xxkey, buf + PMK_LEN, PMK_LEN); 187 sm->xxkey_len = PMK_LEN; 188 os_memset(buf, 0, sizeof(buf)); 189 } 190 #endif /* CONFIG_IEEE80211R */ 191 } 192 if (res == 0) { 193 struct rsn_pmksa_cache_entry *sa = NULL; 194 wpa_hexdump_key(MSG_DEBUG, "WPA: PMK from EAPOL state " 195 "machines", sm->pmk, pmk_len); 196 sm->pmk_len = pmk_len; 197 if (sm->proto == WPA_PROTO_RSN && 198 !wpa_key_mgmt_ft(sm->key_mgmt)) { 199 sa = pmksa_cache_add(sm->pmksa, 200 sm->pmk, pmk_len, 201 src_addr, sm->own_addr, 202 sm->network_ctx, 203 sm->key_mgmt); 204 } 205 if (!sm->cur_pmksa && pmkid && 206 pmksa_cache_get(sm->pmksa, src_addr, pmkid, NULL)) 207 { 208 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 209 "RSN: the new PMK matches with the " 210 "PMKID"); 211 abort_cached = 0; 212 } 213 214 if (!sm->cur_pmksa) 215 sm->cur_pmksa = sa; 216 } else { 217 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 218 "WPA: Failed to get master session key from " 219 "EAPOL state machines - key handshake " 220 "aborted"); 221 if (sm->cur_pmksa) { 222 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 223 "RSN: Cancelled PMKSA caching " 224 "attempt"); 225 sm->cur_pmksa = NULL; 226 abort_cached = 1; 227 } else if (!abort_cached) { 228 return -1; 229 } 230 } 231 } 232 233 if (abort_cached && wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt) && 234 !wpa_key_mgmt_ft(sm->key_mgmt)) { 235 /* Send EAPOL-Start to trigger full EAP authentication. */ 236 u8 *buf; 237 size_t buflen; 238 239 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 240 "RSN: no PMKSA entry found - trigger " 241 "full EAP authentication"); 242 buf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_START, 243 NULL, 0, &buflen, NULL); 244 if (buf) { 245 wpa_sm_ether_send(sm, sm->bssid, ETH_P_EAPOL, 246 buf, buflen); 247 os_free(buf); 248 return -2; 249 } 250 251 return -1; 252 } 253 254 return 0; 255 } 256 257 258 /** 259 * wpa_supplicant_send_2_of_4 - Send message 2 of WPA/RSN 4-Way Handshake 260 * @sm: Pointer to WPA state machine data from wpa_sm_init() 261 * @dst: Destination address for the frame 262 * @key: Pointer to the EAPOL-Key frame header 263 * @ver: Version bits from EAPOL-Key Key Info 264 * @nonce: Nonce value for the EAPOL-Key frame 265 * @wpa_ie: WPA/RSN IE 266 * @wpa_ie_len: Length of the WPA/RSN IE 267 * @ptk: PTK to use for keyed hash and encryption 268 * Returns: 0 on success, -1 on failure 269 */ 270 int wpa_supplicant_send_2_of_4(struct wpa_sm *sm, const unsigned char *dst, 271 const struct wpa_eapol_key *key, 272 int ver, const u8 *nonce, 273 const u8 *wpa_ie, size_t wpa_ie_len, 274 struct wpa_ptk *ptk) 275 { 276 size_t rlen; 277 struct wpa_eapol_key *reply; 278 u8 *rbuf; 279 u8 *rsn_ie_buf = NULL; 280 281 if (wpa_ie == NULL) { 282 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "WPA: No wpa_ie set - " 283 "cannot generate msg 2/4"); 284 return -1; 285 } 286 287 #ifdef CONFIG_IEEE80211R 288 if (wpa_key_mgmt_ft(sm->key_mgmt)) { 289 int res; 290 291 /* 292 * Add PMKR1Name into RSN IE (PMKID-List) and add MDIE and 293 * FTIE from (Re)Association Response. 294 */ 295 rsn_ie_buf = os_malloc(wpa_ie_len + 2 + 2 + PMKID_LEN + 296 sm->assoc_resp_ies_len); 297 if (rsn_ie_buf == NULL) 298 return -1; 299 os_memcpy(rsn_ie_buf, wpa_ie, wpa_ie_len); 300 res = wpa_insert_pmkid(rsn_ie_buf, wpa_ie_len, 301 sm->pmk_r1_name); 302 if (res < 0) { 303 os_free(rsn_ie_buf); 304 return -1; 305 } 306 wpa_ie_len += res; 307 308 if (sm->assoc_resp_ies) { 309 os_memcpy(rsn_ie_buf + wpa_ie_len, sm->assoc_resp_ies, 310 sm->assoc_resp_ies_len); 311 wpa_ie_len += sm->assoc_resp_ies_len; 312 } 313 314 wpa_ie = rsn_ie_buf; 315 } 316 #endif /* CONFIG_IEEE80211R */ 317 318 wpa_hexdump(MSG_DEBUG, "WPA: WPA IE for msg 2/4", wpa_ie, wpa_ie_len); 319 320 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, 321 NULL, sizeof(*reply) + wpa_ie_len, 322 &rlen, (void *) &reply); 323 if (rbuf == NULL) { 324 os_free(rsn_ie_buf); 325 return -1; 326 } 327 328 reply->type = sm->proto == WPA_PROTO_RSN ? 329 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; 330 WPA_PUT_BE16(reply->key_info, 331 ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_MIC); 332 if (sm->proto == WPA_PROTO_RSN) 333 WPA_PUT_BE16(reply->key_length, 0); 334 else 335 os_memcpy(reply->key_length, key->key_length, 2); 336 os_memcpy(reply->replay_counter, key->replay_counter, 337 WPA_REPLAY_COUNTER_LEN); 338 wpa_hexdump(MSG_DEBUG, "WPA: Replay Counter", reply->replay_counter, 339 WPA_REPLAY_COUNTER_LEN); 340 341 WPA_PUT_BE16(reply->key_data_length, wpa_ie_len); 342 os_memcpy(reply + 1, wpa_ie, wpa_ie_len); 343 os_free(rsn_ie_buf); 344 345 os_memcpy(reply->key_nonce, nonce, WPA_NONCE_LEN); 346 347 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 2/4"); 348 wpa_eapol_key_send(sm, ptk->kck, ver, dst, ETH_P_EAPOL, 349 rbuf, rlen, reply->key_mic); 350 351 return 0; 352 } 353 354 355 static int wpa_derive_ptk(struct wpa_sm *sm, const unsigned char *src_addr, 356 const struct wpa_eapol_key *key, 357 struct wpa_ptk *ptk) 358 { 359 size_t ptk_len = sm->pairwise_cipher != WPA_CIPHER_TKIP ? 48 : 64; 360 #ifdef CONFIG_IEEE80211R 361 if (wpa_key_mgmt_ft(sm->key_mgmt)) 362 return wpa_derive_ptk_ft(sm, src_addr, key, ptk, ptk_len); 363 #endif /* CONFIG_IEEE80211R */ 364 365 wpa_pmk_to_ptk(sm->pmk, sm->pmk_len, "Pairwise key expansion", 366 sm->own_addr, sm->bssid, sm->snonce, key->key_nonce, 367 (u8 *) ptk, ptk_len, 368 wpa_key_mgmt_sha256(sm->key_mgmt)); 369 return 0; 370 } 371 372 373 static void wpa_supplicant_process_1_of_4(struct wpa_sm *sm, 374 const unsigned char *src_addr, 375 const struct wpa_eapol_key *key, 376 u16 ver) 377 { 378 struct wpa_eapol_ie_parse ie; 379 struct wpa_ptk *ptk; 380 u8 buf[8]; 381 int res; 382 383 if (wpa_sm_get_network_ctx(sm) == NULL) { 384 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "WPA: No SSID info " 385 "found (msg 1 of 4)"); 386 return; 387 } 388 389 wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE); 390 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: RX message 1 of 4-Way " 391 "Handshake from " MACSTR " (ver=%d)", MAC2STR(src_addr), ver); 392 393 os_memset(&ie, 0, sizeof(ie)); 394 395 #ifndef CONFIG_NO_WPA2 396 if (sm->proto == WPA_PROTO_RSN) { 397 /* RSN: msg 1/4 should contain PMKID for the selected PMK */ 398 const u8 *_buf = (const u8 *) (key + 1); 399 size_t len = WPA_GET_BE16(key->key_data_length); 400 wpa_hexdump(MSG_DEBUG, "RSN: msg 1/4 key data", _buf, len); 401 if (wpa_supplicant_parse_ies(_buf, len, &ie) < 0) 402 goto failed; 403 if (ie.pmkid) { 404 wpa_hexdump(MSG_DEBUG, "RSN: PMKID from " 405 "Authenticator", ie.pmkid, PMKID_LEN); 406 } 407 } 408 #endif /* CONFIG_NO_WPA2 */ 409 410 res = wpa_supplicant_get_pmk(sm, src_addr, ie.pmkid); 411 if (res == -2) { 412 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "RSN: Do not reply to " 413 "msg 1/4 - requesting full EAP authentication"); 414 return; 415 } 416 if (res) 417 goto failed; 418 419 if (sm->renew_snonce) { 420 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) { 421 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 422 "WPA: Failed to get random data for SNonce"); 423 goto failed; 424 } 425 sm->renew_snonce = 0; 426 wpa_hexdump(MSG_DEBUG, "WPA: Renewed SNonce", 427 sm->snonce, WPA_NONCE_LEN); 428 } 429 430 /* Calculate PTK which will be stored as a temporary PTK until it has 431 * been verified when processing message 3/4. */ 432 ptk = &sm->tptk; 433 wpa_derive_ptk(sm, src_addr, key, ptk); 434 /* Supplicant: swap tx/rx Mic keys */ 435 os_memcpy(buf, ptk->u.auth.tx_mic_key, 8); 436 os_memcpy(ptk->u.auth.tx_mic_key, ptk->u.auth.rx_mic_key, 8); 437 os_memcpy(ptk->u.auth.rx_mic_key, buf, 8); 438 sm->tptk_set = 1; 439 440 if (wpa_supplicant_send_2_of_4(sm, sm->bssid, key, ver, sm->snonce, 441 sm->assoc_wpa_ie, sm->assoc_wpa_ie_len, 442 ptk)) 443 goto failed; 444 445 os_memcpy(sm->anonce, key->key_nonce, WPA_NONCE_LEN); 446 return; 447 448 failed: 449 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED); 450 } 451 452 453 static void wpa_sm_start_preauth(void *eloop_ctx, void *timeout_ctx) 454 { 455 struct wpa_sm *sm = eloop_ctx; 456 rsn_preauth_candidate_process(sm); 457 } 458 459 460 static void wpa_supplicant_key_neg_complete(struct wpa_sm *sm, 461 const u8 *addr, int secure) 462 { 463 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 464 "WPA: Key negotiation completed with " 465 MACSTR " [PTK=%s GTK=%s]", MAC2STR(addr), 466 wpa_cipher_txt(sm->pairwise_cipher), 467 wpa_cipher_txt(sm->group_cipher)); 468 wpa_sm_cancel_auth_timeout(sm); 469 wpa_sm_set_state(sm, WPA_COMPLETED); 470 471 if (secure) { 472 wpa_sm_mlme_setprotection( 473 sm, addr, MLME_SETPROTECTION_PROTECT_TYPE_RX_TX, 474 MLME_SETPROTECTION_KEY_TYPE_PAIRWISE); 475 eapol_sm_notify_portValid(sm->eapol, TRUE); 476 if (wpa_key_mgmt_wpa_psk(sm->key_mgmt)) 477 eapol_sm_notify_eap_success(sm->eapol, TRUE); 478 /* 479 * Start preauthentication after a short wait to avoid a 480 * possible race condition between the data receive and key 481 * configuration after the 4-Way Handshake. This increases the 482 * likelihood of the first preauth EAPOL-Start frame getting to 483 * the target AP. 484 */ 485 eloop_register_timeout(1, 0, wpa_sm_start_preauth, sm, NULL); 486 } 487 488 if (sm->cur_pmksa && sm->cur_pmksa->opportunistic) { 489 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 490 "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, NULL); 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_dbg(sm->ctx->msg_ctx, 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 enum wpa_alg alg; 517 const u8 *key_rsc; 518 u8 null_rsc[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 519 520 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 521 "WPA: Installing PTK to the driver"); 522 523 if (sm->pairwise_cipher == WPA_CIPHER_NONE) { 524 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Pairwise Cipher " 525 "Suite: NONE - do not use pairwise keys"); 526 return 0; 527 } 528 529 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) { 530 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 531 "WPA: Unsupported pairwise cipher %d", 532 sm->pairwise_cipher); 533 return -1; 534 } 535 536 alg = wpa_cipher_to_alg(sm->pairwise_cipher); 537 keylen = wpa_cipher_key_len(sm->pairwise_cipher); 538 rsclen = wpa_cipher_rsc_len(sm->pairwise_cipher); 539 540 if (sm->proto == WPA_PROTO_RSN) { 541 key_rsc = null_rsc; 542 } else { 543 key_rsc = key->key_rsc; 544 wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, rsclen); 545 } 546 547 if (wpa_sm_set_key(sm, alg, sm->bssid, 0, 1, key_rsc, rsclen, 548 (u8 *) sm->ptk.tk1, keylen) < 0) { 549 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 550 "WPA: Failed to set PTK to the " 551 "driver (alg=%d keylen=%d bssid=" MACSTR ")", 552 alg, keylen, MAC2STR(sm->bssid)); 553 return -1; 554 } 555 556 if (sm->wpa_ptk_rekey) { 557 eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL); 558 eloop_register_timeout(sm->wpa_ptk_rekey, 0, wpa_sm_rekey_ptk, 559 sm, NULL); 560 } 561 562 return 0; 563 } 564 565 566 static int wpa_supplicant_check_group_cipher(struct wpa_sm *sm, 567 int group_cipher, 568 int keylen, int maxkeylen, 569 int *key_rsc_len, 570 enum wpa_alg *alg) 571 { 572 int klen; 573 574 *alg = wpa_cipher_to_alg(group_cipher); 575 if (*alg == WPA_ALG_NONE) { 576 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 577 "WPA: Unsupported Group Cipher %d", 578 group_cipher); 579 return -1; 580 } 581 *key_rsc_len = wpa_cipher_rsc_len(group_cipher); 582 583 klen = wpa_cipher_key_len(group_cipher); 584 if (keylen != klen || maxkeylen < klen) { 585 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 586 "WPA: Unsupported %s Group Cipher key length %d (%d)", 587 wpa_cipher_txt(group_cipher), keylen, maxkeylen); 588 return -1; 589 } 590 return 0; 591 } 592 593 594 struct wpa_gtk_data { 595 enum wpa_alg alg; 596 int tx, key_rsc_len, keyidx; 597 u8 gtk[32]; 598 int gtk_len; 599 }; 600 601 602 static int wpa_supplicant_install_gtk(struct wpa_sm *sm, 603 const struct wpa_gtk_data *gd, 604 const u8 *key_rsc) 605 { 606 const u8 *_gtk = gd->gtk; 607 u8 gtk_buf[32]; 608 609 wpa_hexdump_key(MSG_DEBUG, "WPA: Group Key", gd->gtk, gd->gtk_len); 610 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 611 "WPA: Installing GTK to the driver (keyidx=%d tx=%d len=%d)", 612 gd->keyidx, gd->tx, gd->gtk_len); 613 wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, gd->key_rsc_len); 614 if (sm->group_cipher == WPA_CIPHER_TKIP) { 615 /* Swap Tx/Rx keys for Michael MIC */ 616 os_memcpy(gtk_buf, gd->gtk, 16); 617 os_memcpy(gtk_buf + 16, gd->gtk + 24, 8); 618 os_memcpy(gtk_buf + 24, gd->gtk + 16, 8); 619 _gtk = gtk_buf; 620 } 621 if (sm->pairwise_cipher == WPA_CIPHER_NONE) { 622 if (wpa_sm_set_key(sm, gd->alg, NULL, 623 gd->keyidx, 1, key_rsc, gd->key_rsc_len, 624 _gtk, gd->gtk_len) < 0) { 625 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 626 "WPA: Failed to set GTK to the driver " 627 "(Group only)"); 628 return -1; 629 } 630 } else if (wpa_sm_set_key(sm, gd->alg, broadcast_ether_addr, 631 gd->keyidx, gd->tx, key_rsc, gd->key_rsc_len, 632 _gtk, gd->gtk_len) < 0) { 633 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 634 "WPA: Failed to set GTK to " 635 "the driver (alg=%d keylen=%d keyidx=%d)", 636 gd->alg, gd->gtk_len, gd->keyidx); 637 return -1; 638 } 639 640 return 0; 641 } 642 643 644 static int wpa_supplicant_gtk_tx_bit_workaround(const struct wpa_sm *sm, 645 int tx) 646 { 647 if (tx && sm->pairwise_cipher != WPA_CIPHER_NONE) { 648 /* Ignore Tx bit for GTK if a pairwise key is used. One AP 649 * seemed to set this bit (incorrectly, since Tx is only when 650 * doing Group Key only APs) and without this workaround, the 651 * data connection does not work because wpa_supplicant 652 * configured non-zero keyidx to be used for unicast. */ 653 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 654 "WPA: Tx bit set for GTK, but pairwise " 655 "keys are used - ignore Tx bit"); 656 return 0; 657 } 658 return tx; 659 } 660 661 662 static int wpa_supplicant_pairwise_gtk(struct wpa_sm *sm, 663 const struct wpa_eapol_key *key, 664 const u8 *gtk, size_t gtk_len, 665 int key_info) 666 { 667 #ifndef CONFIG_NO_WPA2 668 struct wpa_gtk_data gd; 669 670 /* 671 * IEEE Std 802.11i-2004 - 8.5.2 EAPOL-Key frames - Figure 43x 672 * GTK KDE format: 673 * KeyID[bits 0-1], Tx [bit 2], Reserved [bits 3-7] 674 * Reserved [bits 0-7] 675 * GTK 676 */ 677 678 os_memset(&gd, 0, sizeof(gd)); 679 wpa_hexdump_key(MSG_DEBUG, "RSN: received GTK in pairwise handshake", 680 gtk, gtk_len); 681 682 if (gtk_len < 2 || gtk_len - 2 > sizeof(gd.gtk)) 683 return -1; 684 685 gd.keyidx = gtk[0] & 0x3; 686 gd.tx = wpa_supplicant_gtk_tx_bit_workaround(sm, 687 !!(gtk[0] & BIT(2))); 688 gtk += 2; 689 gtk_len -= 2; 690 691 os_memcpy(gd.gtk, gtk, gtk_len); 692 gd.gtk_len = gtk_len; 693 694 if (wpa_supplicant_check_group_cipher(sm, sm->group_cipher, 695 gtk_len, gtk_len, 696 &gd.key_rsc_len, &gd.alg) || 697 wpa_supplicant_install_gtk(sm, &gd, key->key_rsc)) { 698 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 699 "RSN: Failed to install GTK"); 700 return -1; 701 } 702 703 wpa_supplicant_key_neg_complete(sm, sm->bssid, 704 key_info & WPA_KEY_INFO_SECURE); 705 return 0; 706 #else /* CONFIG_NO_WPA2 */ 707 return -1; 708 #endif /* CONFIG_NO_WPA2 */ 709 } 710 711 712 static int ieee80211w_set_keys(struct wpa_sm *sm, 713 struct wpa_eapol_ie_parse *ie) 714 { 715 #ifdef CONFIG_IEEE80211W 716 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC) 717 return 0; 718 719 if (ie->igtk) { 720 const struct wpa_igtk_kde *igtk; 721 u16 keyidx; 722 if (ie->igtk_len != sizeof(*igtk)) 723 return -1; 724 igtk = (const struct wpa_igtk_kde *) ie->igtk; 725 keyidx = WPA_GET_LE16(igtk->keyid); 726 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: IGTK keyid %d " 727 "pn %02x%02x%02x%02x%02x%02x", 728 keyidx, MAC2STR(igtk->pn)); 729 wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK", 730 igtk->igtk, WPA_IGTK_LEN); 731 if (keyidx > 4095) { 732 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 733 "WPA: Invalid IGTK KeyID %d", keyidx); 734 return -1; 735 } 736 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, 737 keyidx, 0, igtk->pn, sizeof(igtk->pn), 738 igtk->igtk, WPA_IGTK_LEN) < 0) { 739 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 740 "WPA: Failed to configure IGTK to the driver"); 741 return -1; 742 } 743 } 744 745 return 0; 746 #else /* CONFIG_IEEE80211W */ 747 return 0; 748 #endif /* CONFIG_IEEE80211W */ 749 } 750 751 752 static void wpa_report_ie_mismatch(struct wpa_sm *sm, 753 const char *reason, const u8 *src_addr, 754 const u8 *wpa_ie, size_t wpa_ie_len, 755 const u8 *rsn_ie, size_t rsn_ie_len) 756 { 757 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "WPA: %s (src=" MACSTR ")", 758 reason, MAC2STR(src_addr)); 759 760 if (sm->ap_wpa_ie) { 761 wpa_hexdump(MSG_INFO, "WPA: WPA IE in Beacon/ProbeResp", 762 sm->ap_wpa_ie, sm->ap_wpa_ie_len); 763 } 764 if (wpa_ie) { 765 if (!sm->ap_wpa_ie) { 766 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 767 "WPA: No WPA IE in Beacon/ProbeResp"); 768 } 769 wpa_hexdump(MSG_INFO, "WPA: WPA IE in 3/4 msg", 770 wpa_ie, wpa_ie_len); 771 } 772 773 if (sm->ap_rsn_ie) { 774 wpa_hexdump(MSG_INFO, "WPA: RSN IE in Beacon/ProbeResp", 775 sm->ap_rsn_ie, sm->ap_rsn_ie_len); 776 } 777 if (rsn_ie) { 778 if (!sm->ap_rsn_ie) { 779 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 780 "WPA: No RSN IE in Beacon/ProbeResp"); 781 } 782 wpa_hexdump(MSG_INFO, "WPA: RSN IE in 3/4 msg", 783 rsn_ie, rsn_ie_len); 784 } 785 786 wpa_sm_deauthenticate(sm, WLAN_REASON_IE_IN_4WAY_DIFFERS); 787 } 788 789 790 #ifdef CONFIG_IEEE80211R 791 792 static int ft_validate_mdie(struct wpa_sm *sm, 793 const unsigned char *src_addr, 794 struct wpa_eapol_ie_parse *ie, 795 const u8 *assoc_resp_mdie) 796 { 797 struct rsn_mdie *mdie; 798 799 mdie = (struct rsn_mdie *) (ie->mdie + 2); 800 if (ie->mdie == NULL || ie->mdie_len < 2 + sizeof(*mdie) || 801 os_memcmp(mdie->mobility_domain, sm->mobility_domain, 802 MOBILITY_DOMAIN_ID_LEN) != 0) { 803 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: MDIE in msg 3/4 did " 804 "not match with the current mobility domain"); 805 return -1; 806 } 807 808 if (assoc_resp_mdie && 809 (assoc_resp_mdie[1] != ie->mdie[1] || 810 os_memcmp(assoc_resp_mdie, ie->mdie, 2 + ie->mdie[1]) != 0)) { 811 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: MDIE mismatch"); 812 wpa_hexdump(MSG_DEBUG, "FT: MDIE in EAPOL-Key msg 3/4", 813 ie->mdie, 2 + ie->mdie[1]); 814 wpa_hexdump(MSG_DEBUG, "FT: MDIE in (Re)Association Response", 815 assoc_resp_mdie, 2 + assoc_resp_mdie[1]); 816 return -1; 817 } 818 819 return 0; 820 } 821 822 823 static int ft_validate_ftie(struct wpa_sm *sm, 824 const unsigned char *src_addr, 825 struct wpa_eapol_ie_parse *ie, 826 const u8 *assoc_resp_ftie) 827 { 828 if (ie->ftie == NULL) { 829 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 830 "FT: No FTIE in EAPOL-Key msg 3/4"); 831 return -1; 832 } 833 834 if (assoc_resp_ftie == NULL) 835 return 0; 836 837 if (assoc_resp_ftie[1] != ie->ftie[1] || 838 os_memcmp(assoc_resp_ftie, ie->ftie, 2 + ie->ftie[1]) != 0) { 839 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: FTIE mismatch"); 840 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 3/4", 841 ie->ftie, 2 + ie->ftie[1]); 842 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)Association Response", 843 assoc_resp_ftie, 2 + assoc_resp_ftie[1]); 844 return -1; 845 } 846 847 return 0; 848 } 849 850 851 static int ft_validate_rsnie(struct wpa_sm *sm, 852 const unsigned char *src_addr, 853 struct wpa_eapol_ie_parse *ie) 854 { 855 struct wpa_ie_data rsn; 856 857 if (!ie->rsn_ie) 858 return 0; 859 860 /* 861 * Verify that PMKR1Name from EAPOL-Key message 3/4 862 * matches with the value we derived. 863 */ 864 if (wpa_parse_wpa_ie_rsn(ie->rsn_ie, ie->rsn_ie_len, &rsn) < 0 || 865 rsn.num_pmkid != 1 || rsn.pmkid == NULL) { 866 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: No PMKR1Name in " 867 "FT 4-way handshake message 3/4"); 868 return -1; 869 } 870 871 if (os_memcmp(rsn.pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0) { 872 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 873 "FT: PMKR1Name mismatch in " 874 "FT 4-way handshake message 3/4"); 875 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Authenticator", 876 rsn.pmkid, WPA_PMK_NAME_LEN); 877 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name", 878 sm->pmk_r1_name, WPA_PMK_NAME_LEN); 879 return -1; 880 } 881 882 return 0; 883 } 884 885 886 static int wpa_supplicant_validate_ie_ft(struct wpa_sm *sm, 887 const unsigned char *src_addr, 888 struct wpa_eapol_ie_parse *ie) 889 { 890 const u8 *pos, *end, *mdie = NULL, *ftie = NULL; 891 892 if (sm->assoc_resp_ies) { 893 pos = sm->assoc_resp_ies; 894 end = pos + sm->assoc_resp_ies_len; 895 while (pos + 2 < end) { 896 if (pos + 2 + pos[1] > end) 897 break; 898 switch (*pos) { 899 case WLAN_EID_MOBILITY_DOMAIN: 900 mdie = pos; 901 break; 902 case WLAN_EID_FAST_BSS_TRANSITION: 903 ftie = pos; 904 break; 905 } 906 pos += 2 + pos[1]; 907 } 908 } 909 910 if (ft_validate_mdie(sm, src_addr, ie, mdie) < 0 || 911 ft_validate_ftie(sm, src_addr, ie, ftie) < 0 || 912 ft_validate_rsnie(sm, src_addr, ie) < 0) 913 return -1; 914 915 return 0; 916 } 917 918 #endif /* CONFIG_IEEE80211R */ 919 920 921 static int wpa_supplicant_validate_ie(struct wpa_sm *sm, 922 const unsigned char *src_addr, 923 struct wpa_eapol_ie_parse *ie) 924 { 925 if (sm->ap_wpa_ie == NULL && sm->ap_rsn_ie == NULL) { 926 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 927 "WPA: No WPA/RSN IE for this AP known. " 928 "Trying to get from scan results"); 929 if (wpa_sm_get_beacon_ie(sm) < 0) { 930 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 931 "WPA: Could not find AP from " 932 "the scan results"); 933 } else { 934 wpa_msg(sm->ctx->msg_ctx, MSG_DEBUG, 935 "WPA: Found the current AP from " 936 "updated scan results"); 937 } 938 } 939 940 if (ie->wpa_ie == NULL && ie->rsn_ie == NULL && 941 (sm->ap_wpa_ie || sm->ap_rsn_ie)) { 942 wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match " 943 "with IE in Beacon/ProbeResp (no IE?)", 944 src_addr, ie->wpa_ie, ie->wpa_ie_len, 945 ie->rsn_ie, ie->rsn_ie_len); 946 return -1; 947 } 948 949 if ((ie->wpa_ie && sm->ap_wpa_ie && 950 (ie->wpa_ie_len != sm->ap_wpa_ie_len || 951 os_memcmp(ie->wpa_ie, sm->ap_wpa_ie, ie->wpa_ie_len) != 0)) || 952 (ie->rsn_ie && sm->ap_rsn_ie && 953 wpa_compare_rsn_ie(wpa_key_mgmt_ft(sm->key_mgmt), 954 sm->ap_rsn_ie, sm->ap_rsn_ie_len, 955 ie->rsn_ie, ie->rsn_ie_len))) { 956 wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match " 957 "with IE in Beacon/ProbeResp", 958 src_addr, ie->wpa_ie, ie->wpa_ie_len, 959 ie->rsn_ie, ie->rsn_ie_len); 960 return -1; 961 } 962 963 if (sm->proto == WPA_PROTO_WPA && 964 ie->rsn_ie && sm->ap_rsn_ie == NULL && sm->rsn_enabled) { 965 wpa_report_ie_mismatch(sm, "Possible downgrade attack " 966 "detected - RSN was enabled and RSN IE " 967 "was in msg 3/4, but not in " 968 "Beacon/ProbeResp", 969 src_addr, ie->wpa_ie, ie->wpa_ie_len, 970 ie->rsn_ie, ie->rsn_ie_len); 971 return -1; 972 } 973 974 #ifdef CONFIG_IEEE80211R 975 if (wpa_key_mgmt_ft(sm->key_mgmt) && 976 wpa_supplicant_validate_ie_ft(sm, src_addr, ie) < 0) 977 return -1; 978 #endif /* CONFIG_IEEE80211R */ 979 980 return 0; 981 } 982 983 984 /** 985 * wpa_supplicant_send_4_of_4 - Send message 4 of WPA/RSN 4-Way Handshake 986 * @sm: Pointer to WPA state machine data from wpa_sm_init() 987 * @dst: Destination address for the frame 988 * @key: Pointer to the EAPOL-Key frame header 989 * @ver: Version bits from EAPOL-Key Key Info 990 * @key_info: Key Info 991 * @kde: KDEs to include the EAPOL-Key frame 992 * @kde_len: Length of KDEs 993 * @ptk: PTK to use for keyed hash and encryption 994 * Returns: 0 on success, -1 on failure 995 */ 996 int wpa_supplicant_send_4_of_4(struct wpa_sm *sm, const unsigned char *dst, 997 const struct wpa_eapol_key *key, 998 u16 ver, u16 key_info, 999 const u8 *kde, size_t kde_len, 1000 struct wpa_ptk *ptk) 1001 { 1002 size_t rlen; 1003 struct wpa_eapol_key *reply; 1004 u8 *rbuf; 1005 1006 if (kde) 1007 wpa_hexdump(MSG_DEBUG, "WPA: KDE for msg 4/4", kde, kde_len); 1008 1009 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL, 1010 sizeof(*reply) + kde_len, 1011 &rlen, (void *) &reply); 1012 if (rbuf == NULL) 1013 return -1; 1014 1015 reply->type = sm->proto == WPA_PROTO_RSN ? 1016 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; 1017 key_info &= WPA_KEY_INFO_SECURE; 1018 key_info |= ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_MIC; 1019 WPA_PUT_BE16(reply->key_info, key_info); 1020 if (sm->proto == WPA_PROTO_RSN) 1021 WPA_PUT_BE16(reply->key_length, 0); 1022 else 1023 os_memcpy(reply->key_length, key->key_length, 2); 1024 os_memcpy(reply->replay_counter, key->replay_counter, 1025 WPA_REPLAY_COUNTER_LEN); 1026 1027 WPA_PUT_BE16(reply->key_data_length, kde_len); 1028 if (kde) 1029 os_memcpy(reply + 1, kde, kde_len); 1030 1031 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 4/4"); 1032 wpa_eapol_key_send(sm, ptk->kck, ver, dst, ETH_P_EAPOL, 1033 rbuf, rlen, reply->key_mic); 1034 1035 return 0; 1036 } 1037 1038 1039 static void wpa_supplicant_process_3_of_4(struct wpa_sm *sm, 1040 const struct wpa_eapol_key *key, 1041 u16 ver) 1042 { 1043 u16 key_info, keylen, len; 1044 const u8 *pos; 1045 struct wpa_eapol_ie_parse ie; 1046 1047 wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE); 1048 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: RX message 3 of 4-Way " 1049 "Handshake from " MACSTR " (ver=%d)", MAC2STR(sm->bssid), ver); 1050 1051 key_info = WPA_GET_BE16(key->key_info); 1052 1053 pos = (const u8 *) (key + 1); 1054 len = WPA_GET_BE16(key->key_data_length); 1055 wpa_hexdump(MSG_DEBUG, "WPA: IE KeyData", pos, len); 1056 if (wpa_supplicant_parse_ies(pos, len, &ie) < 0) 1057 goto failed; 1058 if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) { 1059 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1060 "WPA: GTK IE in unencrypted key data"); 1061 goto failed; 1062 } 1063 #ifdef CONFIG_IEEE80211W 1064 if (ie.igtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) { 1065 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1066 "WPA: IGTK KDE in unencrypted key data"); 1067 goto failed; 1068 } 1069 1070 if (ie.igtk && ie.igtk_len != sizeof(struct wpa_igtk_kde)) { 1071 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1072 "WPA: Invalid IGTK KDE length %lu", 1073 (unsigned long) ie.igtk_len); 1074 goto failed; 1075 } 1076 #endif /* CONFIG_IEEE80211W */ 1077 1078 if (wpa_supplicant_validate_ie(sm, sm->bssid, &ie) < 0) 1079 goto failed; 1080 1081 if (os_memcmp(sm->anonce, key->key_nonce, WPA_NONCE_LEN) != 0) { 1082 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1083 "WPA: ANonce from message 1 of 4-Way Handshake " 1084 "differs from 3 of 4-Way Handshake - drop packet (src=" 1085 MACSTR ")", MAC2STR(sm->bssid)); 1086 goto failed; 1087 } 1088 1089 keylen = WPA_GET_BE16(key->key_length); 1090 if (keylen != wpa_cipher_key_len(sm->pairwise_cipher)) { 1091 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1092 "WPA: Invalid %s key length %d (src=" MACSTR 1093 ")", wpa_cipher_txt(sm->pairwise_cipher), keylen, 1094 MAC2STR(sm->bssid)); 1095 goto failed; 1096 } 1097 1098 if (wpa_supplicant_send_4_of_4(sm, sm->bssid, key, ver, key_info, 1099 NULL, 0, &sm->ptk)) { 1100 goto failed; 1101 } 1102 1103 /* SNonce was successfully used in msg 3/4, so mark it to be renewed 1104 * for the next 4-Way Handshake. If msg 3 is received again, the old 1105 * SNonce will still be used to avoid changing PTK. */ 1106 sm->renew_snonce = 1; 1107 1108 if (key_info & WPA_KEY_INFO_INSTALL) { 1109 if (wpa_supplicant_install_ptk(sm, key)) 1110 goto failed; 1111 } 1112 1113 if (key_info & WPA_KEY_INFO_SECURE) { 1114 wpa_sm_mlme_setprotection( 1115 sm, sm->bssid, MLME_SETPROTECTION_PROTECT_TYPE_RX, 1116 MLME_SETPROTECTION_KEY_TYPE_PAIRWISE); 1117 eapol_sm_notify_portValid(sm->eapol, TRUE); 1118 } 1119 wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE); 1120 1121 if (ie.gtk && 1122 wpa_supplicant_pairwise_gtk(sm, key, 1123 ie.gtk, ie.gtk_len, key_info) < 0) { 1124 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1125 "RSN: Failed to configure GTK"); 1126 goto failed; 1127 } 1128 1129 if (ieee80211w_set_keys(sm, &ie) < 0) { 1130 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1131 "RSN: Failed to configure IGTK"); 1132 goto failed; 1133 } 1134 1135 wpa_sm_set_rekey_offload(sm); 1136 1137 return; 1138 1139 failed: 1140 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED); 1141 } 1142 1143 1144 static int wpa_supplicant_process_1_of_2_rsn(struct wpa_sm *sm, 1145 const u8 *keydata, 1146 size_t keydatalen, 1147 u16 key_info, 1148 struct wpa_gtk_data *gd) 1149 { 1150 int maxkeylen; 1151 struct wpa_eapol_ie_parse ie; 1152 1153 wpa_hexdump(MSG_DEBUG, "RSN: msg 1/2 key data", keydata, keydatalen); 1154 if (wpa_supplicant_parse_ies(keydata, keydatalen, &ie) < 0) 1155 return -1; 1156 if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) { 1157 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1158 "WPA: GTK IE in unencrypted key data"); 1159 return -1; 1160 } 1161 if (ie.gtk == NULL) { 1162 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1163 "WPA: No GTK IE in Group Key msg 1/2"); 1164 return -1; 1165 } 1166 maxkeylen = gd->gtk_len = ie.gtk_len - 2; 1167 1168 if (wpa_supplicant_check_group_cipher(sm, sm->group_cipher, 1169 gd->gtk_len, maxkeylen, 1170 &gd->key_rsc_len, &gd->alg)) 1171 return -1; 1172 1173 wpa_hexdump(MSG_DEBUG, "RSN: received GTK in group key handshake", 1174 ie.gtk, ie.gtk_len); 1175 gd->keyidx = ie.gtk[0] & 0x3; 1176 gd->tx = wpa_supplicant_gtk_tx_bit_workaround(sm, 1177 !!(ie.gtk[0] & BIT(2))); 1178 if (ie.gtk_len - 2 > sizeof(gd->gtk)) { 1179 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1180 "RSN: Too long GTK in GTK IE (len=%lu)", 1181 (unsigned long) ie.gtk_len - 2); 1182 return -1; 1183 } 1184 os_memcpy(gd->gtk, ie.gtk + 2, ie.gtk_len - 2); 1185 1186 if (ieee80211w_set_keys(sm, &ie) < 0) 1187 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1188 "RSN: Failed to configure IGTK"); 1189 1190 return 0; 1191 } 1192 1193 1194 static int wpa_supplicant_process_1_of_2_wpa(struct wpa_sm *sm, 1195 const struct wpa_eapol_key *key, 1196 size_t keydatalen, int key_info, 1197 size_t extra_len, u16 ver, 1198 struct wpa_gtk_data *gd) 1199 { 1200 size_t maxkeylen; 1201 u8 ek[32]; 1202 1203 gd->gtk_len = WPA_GET_BE16(key->key_length); 1204 maxkeylen = keydatalen; 1205 if (keydatalen > extra_len) { 1206 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1207 "WPA: Truncated EAPOL-Key packet: " 1208 "key_data_length=%lu > extra_len=%lu", 1209 (unsigned long) keydatalen, (unsigned long) extra_len); 1210 return -1; 1211 } 1212 if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 1213 if (maxkeylen < 8) { 1214 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1215 "WPA: Too short maxkeylen (%lu)", 1216 (unsigned long) maxkeylen); 1217 return -1; 1218 } 1219 maxkeylen -= 8; 1220 } 1221 1222 if (wpa_supplicant_check_group_cipher(sm, sm->group_cipher, 1223 gd->gtk_len, maxkeylen, 1224 &gd->key_rsc_len, &gd->alg)) 1225 return -1; 1226 1227 gd->keyidx = (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >> 1228 WPA_KEY_INFO_KEY_INDEX_SHIFT; 1229 if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4) { 1230 os_memcpy(ek, key->key_iv, 16); 1231 os_memcpy(ek + 16, sm->ptk.kek, 16); 1232 if (keydatalen > sizeof(gd->gtk)) { 1233 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1234 "WPA: RC4 key data too long (%lu)", 1235 (unsigned long) keydatalen); 1236 return -1; 1237 } 1238 os_memcpy(gd->gtk, key + 1, keydatalen); 1239 if (rc4_skip(ek, 32, 256, gd->gtk, keydatalen)) { 1240 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR, 1241 "WPA: RC4 failed"); 1242 return -1; 1243 } 1244 } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 1245 if (keydatalen % 8) { 1246 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1247 "WPA: Unsupported AES-WRAP len %lu", 1248 (unsigned long) keydatalen); 1249 return -1; 1250 } 1251 if (maxkeylen > sizeof(gd->gtk)) { 1252 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1253 "WPA: AES-WRAP key data " 1254 "too long (keydatalen=%lu maxkeylen=%lu)", 1255 (unsigned long) keydatalen, 1256 (unsigned long) maxkeylen); 1257 return -1; 1258 } 1259 if (aes_unwrap(sm->ptk.kek, maxkeylen / 8, 1260 (const u8 *) (key + 1), gd->gtk)) { 1261 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1262 "WPA: AES unwrap failed - could not decrypt " 1263 "GTK"); 1264 return -1; 1265 } 1266 } else { 1267 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1268 "WPA: Unsupported key_info type %d", ver); 1269 return -1; 1270 } 1271 gd->tx = wpa_supplicant_gtk_tx_bit_workaround( 1272 sm, !!(key_info & WPA_KEY_INFO_TXRX)); 1273 return 0; 1274 } 1275 1276 1277 static int wpa_supplicant_send_2_of_2(struct wpa_sm *sm, 1278 const struct wpa_eapol_key *key, 1279 int ver, u16 key_info) 1280 { 1281 size_t rlen; 1282 struct wpa_eapol_key *reply; 1283 u8 *rbuf; 1284 1285 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL, 1286 sizeof(*reply), &rlen, (void *) &reply); 1287 if (rbuf == NULL) 1288 return -1; 1289 1290 reply->type = sm->proto == WPA_PROTO_RSN ? 1291 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; 1292 key_info &= WPA_KEY_INFO_KEY_INDEX_MASK; 1293 key_info |= ver | WPA_KEY_INFO_MIC | WPA_KEY_INFO_SECURE; 1294 WPA_PUT_BE16(reply->key_info, key_info); 1295 if (sm->proto == WPA_PROTO_RSN) 1296 WPA_PUT_BE16(reply->key_length, 0); 1297 else 1298 os_memcpy(reply->key_length, key->key_length, 2); 1299 os_memcpy(reply->replay_counter, key->replay_counter, 1300 WPA_REPLAY_COUNTER_LEN); 1301 1302 WPA_PUT_BE16(reply->key_data_length, 0); 1303 1304 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 2/2"); 1305 wpa_eapol_key_send(sm, sm->ptk.kck, ver, sm->bssid, ETH_P_EAPOL, 1306 rbuf, rlen, reply->key_mic); 1307 1308 return 0; 1309 } 1310 1311 1312 static void wpa_supplicant_process_1_of_2(struct wpa_sm *sm, 1313 const unsigned char *src_addr, 1314 const struct wpa_eapol_key *key, 1315 int extra_len, u16 ver) 1316 { 1317 u16 key_info, keydatalen; 1318 int rekey, ret; 1319 struct wpa_gtk_data gd; 1320 1321 os_memset(&gd, 0, sizeof(gd)); 1322 1323 rekey = wpa_sm_get_state(sm) == WPA_COMPLETED; 1324 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: RX message 1 of Group Key " 1325 "Handshake from " MACSTR " (ver=%d)", MAC2STR(src_addr), ver); 1326 1327 key_info = WPA_GET_BE16(key->key_info); 1328 keydatalen = WPA_GET_BE16(key->key_data_length); 1329 1330 if (sm->proto == WPA_PROTO_RSN) { 1331 ret = wpa_supplicant_process_1_of_2_rsn(sm, 1332 (const u8 *) (key + 1), 1333 keydatalen, key_info, 1334 &gd); 1335 } else { 1336 ret = wpa_supplicant_process_1_of_2_wpa(sm, key, keydatalen, 1337 key_info, extra_len, 1338 ver, &gd); 1339 } 1340 1341 wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE); 1342 1343 if (ret) 1344 goto failed; 1345 1346 if (wpa_supplicant_install_gtk(sm, &gd, key->key_rsc) || 1347 wpa_supplicant_send_2_of_2(sm, key, ver, key_info)) 1348 goto failed; 1349 1350 if (rekey) { 1351 wpa_msg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Group rekeying " 1352 "completed with " MACSTR " [GTK=%s]", 1353 MAC2STR(sm->bssid), wpa_cipher_txt(sm->group_cipher)); 1354 wpa_sm_cancel_auth_timeout(sm); 1355 wpa_sm_set_state(sm, WPA_COMPLETED); 1356 1357 wpa_sm_set_rekey_offload(sm); 1358 } else { 1359 wpa_supplicant_key_neg_complete(sm, sm->bssid, 1360 key_info & 1361 WPA_KEY_INFO_SECURE); 1362 } 1363 return; 1364 1365 failed: 1366 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED); 1367 } 1368 1369 1370 static int wpa_supplicant_verify_eapol_key_mic(struct wpa_sm *sm, 1371 struct wpa_eapol_key *key, 1372 u16 ver, 1373 const u8 *buf, size_t len) 1374 { 1375 u8 mic[16]; 1376 int ok = 0; 1377 1378 os_memcpy(mic, key->key_mic, 16); 1379 if (sm->tptk_set) { 1380 os_memset(key->key_mic, 0, 16); 1381 wpa_eapol_key_mic(sm->tptk.kck, ver, buf, len, 1382 key->key_mic); 1383 if (os_memcmp(mic, key->key_mic, 16) != 0) { 1384 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1385 "WPA: Invalid EAPOL-Key MIC " 1386 "when using TPTK - ignoring TPTK"); 1387 } else { 1388 ok = 1; 1389 sm->tptk_set = 0; 1390 sm->ptk_set = 1; 1391 os_memcpy(&sm->ptk, &sm->tptk, sizeof(sm->ptk)); 1392 } 1393 } 1394 1395 if (!ok && sm->ptk_set) { 1396 os_memset(key->key_mic, 0, 16); 1397 wpa_eapol_key_mic(sm->ptk.kck, ver, buf, len, 1398 key->key_mic); 1399 if (os_memcmp(mic, key->key_mic, 16) != 0) { 1400 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1401 "WPA: Invalid EAPOL-Key MIC - " 1402 "dropping packet"); 1403 return -1; 1404 } 1405 ok = 1; 1406 } 1407 1408 if (!ok) { 1409 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1410 "WPA: Could not verify EAPOL-Key MIC - " 1411 "dropping packet"); 1412 return -1; 1413 } 1414 1415 os_memcpy(sm->rx_replay_counter, key->replay_counter, 1416 WPA_REPLAY_COUNTER_LEN); 1417 sm->rx_replay_counter_set = 1; 1418 return 0; 1419 } 1420 1421 1422 /* Decrypt RSN EAPOL-Key key data (RC4 or AES-WRAP) */ 1423 static int wpa_supplicant_decrypt_key_data(struct wpa_sm *sm, 1424 struct wpa_eapol_key *key, u16 ver) 1425 { 1426 u16 keydatalen = WPA_GET_BE16(key->key_data_length); 1427 1428 wpa_hexdump(MSG_DEBUG, "RSN: encrypted key data", 1429 (u8 *) (key + 1), keydatalen); 1430 if (!sm->ptk_set) { 1431 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1432 "WPA: PTK not available, cannot decrypt EAPOL-Key Key " 1433 "Data"); 1434 return -1; 1435 } 1436 1437 /* Decrypt key data here so that this operation does not need 1438 * to be implemented separately for each message type. */ 1439 if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4) { 1440 u8 ek[32]; 1441 os_memcpy(ek, key->key_iv, 16); 1442 os_memcpy(ek + 16, sm->ptk.kek, 16); 1443 if (rc4_skip(ek, 32, 256, (u8 *) (key + 1), keydatalen)) { 1444 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR, 1445 "WPA: RC4 failed"); 1446 return -1; 1447 } 1448 } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES || 1449 ver == WPA_KEY_INFO_TYPE_AES_128_CMAC) { 1450 u8 *buf; 1451 if (keydatalen % 8) { 1452 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1453 "WPA: Unsupported AES-WRAP len %d", 1454 keydatalen); 1455 return -1; 1456 } 1457 keydatalen -= 8; /* AES-WRAP adds 8 bytes */ 1458 buf = os_malloc(keydatalen); 1459 if (buf == NULL) { 1460 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1461 "WPA: No memory for AES-UNWRAP buffer"); 1462 return -1; 1463 } 1464 if (aes_unwrap(sm->ptk.kek, keydatalen / 8, 1465 (u8 *) (key + 1), buf)) { 1466 os_free(buf); 1467 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1468 "WPA: AES unwrap failed - " 1469 "could not decrypt EAPOL-Key key data"); 1470 return -1; 1471 } 1472 os_memcpy(key + 1, buf, keydatalen); 1473 os_free(buf); 1474 WPA_PUT_BE16(key->key_data_length, keydatalen); 1475 } else { 1476 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1477 "WPA: Unsupported key_info type %d", ver); 1478 return -1; 1479 } 1480 wpa_hexdump_key(MSG_DEBUG, "WPA: decrypted EAPOL-Key key data", 1481 (u8 *) (key + 1), keydatalen); 1482 return 0; 1483 } 1484 1485 1486 /** 1487 * wpa_sm_aborted_cached - Notify WPA that PMKSA caching was aborted 1488 * @sm: Pointer to WPA state machine data from wpa_sm_init() 1489 */ 1490 void wpa_sm_aborted_cached(struct wpa_sm *sm) 1491 { 1492 if (sm && sm->cur_pmksa) { 1493 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1494 "RSN: Cancelling PMKSA caching attempt"); 1495 sm->cur_pmksa = NULL; 1496 } 1497 } 1498 1499 1500 static void wpa_eapol_key_dump(struct wpa_sm *sm, 1501 const struct wpa_eapol_key *key) 1502 { 1503 #ifndef CONFIG_NO_STDOUT_DEBUG 1504 u16 key_info = WPA_GET_BE16(key->key_info); 1505 1506 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, " EAPOL-Key type=%d", key->type); 1507 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1508 " key_info 0x%x (ver=%d keyidx=%d rsvd=%d %s%s%s%s%s%s%s%s)", 1509 key_info, key_info & WPA_KEY_INFO_TYPE_MASK, 1510 (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >> 1511 WPA_KEY_INFO_KEY_INDEX_SHIFT, 1512 (key_info & (BIT(13) | BIT(14) | BIT(15))) >> 13, 1513 key_info & WPA_KEY_INFO_KEY_TYPE ? "Pairwise" : "Group", 1514 key_info & WPA_KEY_INFO_INSTALL ? " Install" : "", 1515 key_info & WPA_KEY_INFO_ACK ? " Ack" : "", 1516 key_info & WPA_KEY_INFO_MIC ? " MIC" : "", 1517 key_info & WPA_KEY_INFO_SECURE ? " Secure" : "", 1518 key_info & WPA_KEY_INFO_ERROR ? " Error" : "", 1519 key_info & WPA_KEY_INFO_REQUEST ? " Request" : "", 1520 key_info & WPA_KEY_INFO_ENCR_KEY_DATA ? " Encr" : ""); 1521 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1522 " key_length=%u key_data_length=%u", 1523 WPA_GET_BE16(key->key_length), 1524 WPA_GET_BE16(key->key_data_length)); 1525 wpa_hexdump(MSG_DEBUG, " replay_counter", 1526 key->replay_counter, WPA_REPLAY_COUNTER_LEN); 1527 wpa_hexdump(MSG_DEBUG, " key_nonce", key->key_nonce, WPA_NONCE_LEN); 1528 wpa_hexdump(MSG_DEBUG, " key_iv", key->key_iv, 16); 1529 wpa_hexdump(MSG_DEBUG, " key_rsc", key->key_rsc, 8); 1530 wpa_hexdump(MSG_DEBUG, " key_id (reserved)", key->key_id, 8); 1531 wpa_hexdump(MSG_DEBUG, " key_mic", key->key_mic, 16); 1532 #endif /* CONFIG_NO_STDOUT_DEBUG */ 1533 } 1534 1535 1536 /** 1537 * wpa_sm_rx_eapol - Process received WPA EAPOL frames 1538 * @sm: Pointer to WPA state machine data from wpa_sm_init() 1539 * @src_addr: Source MAC address of the EAPOL packet 1540 * @buf: Pointer to the beginning of the EAPOL data (EAPOL header) 1541 * @len: Length of the EAPOL frame 1542 * Returns: 1 = WPA EAPOL-Key processed, 0 = not a WPA EAPOL-Key, -1 failure 1543 * 1544 * This function is called for each received EAPOL frame. Other than EAPOL-Key 1545 * frames can be skipped if filtering is done elsewhere. wpa_sm_rx_eapol() is 1546 * only processing WPA and WPA2 EAPOL-Key frames. 1547 * 1548 * The received EAPOL-Key packets are validated and valid packets are replied 1549 * to. In addition, key material (PTK, GTK) is configured at the end of a 1550 * successful key handshake. 1551 */ 1552 int wpa_sm_rx_eapol(struct wpa_sm *sm, const u8 *src_addr, 1553 const u8 *buf, size_t len) 1554 { 1555 size_t plen, data_len, extra_len; 1556 struct ieee802_1x_hdr *hdr; 1557 struct wpa_eapol_key *key; 1558 u16 key_info, ver; 1559 u8 *tmp; 1560 int ret = -1; 1561 struct wpa_peerkey *peerkey = NULL; 1562 1563 #ifdef CONFIG_IEEE80211R 1564 sm->ft_completed = 0; 1565 #endif /* CONFIG_IEEE80211R */ 1566 1567 if (len < sizeof(*hdr) + sizeof(*key)) { 1568 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1569 "WPA: EAPOL frame too short to be a WPA " 1570 "EAPOL-Key (len %lu, expecting at least %lu)", 1571 (unsigned long) len, 1572 (unsigned long) sizeof(*hdr) + sizeof(*key)); 1573 return 0; 1574 } 1575 1576 tmp = os_malloc(len); 1577 if (tmp == NULL) 1578 return -1; 1579 os_memcpy(tmp, buf, len); 1580 1581 hdr = (struct ieee802_1x_hdr *) tmp; 1582 key = (struct wpa_eapol_key *) (hdr + 1); 1583 plen = be_to_host16(hdr->length); 1584 data_len = plen + sizeof(*hdr); 1585 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1586 "IEEE 802.1X RX: version=%d type=%d length=%lu", 1587 hdr->version, hdr->type, (unsigned long) plen); 1588 1589 if (hdr->version < EAPOL_VERSION) { 1590 /* TODO: backwards compatibility */ 1591 } 1592 if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) { 1593 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1594 "WPA: EAPOL frame (type %u) discarded, " 1595 "not a Key frame", hdr->type); 1596 ret = 0; 1597 goto out; 1598 } 1599 if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) { 1600 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1601 "WPA: EAPOL frame payload size %lu " 1602 "invalid (frame size %lu)", 1603 (unsigned long) plen, (unsigned long) len); 1604 ret = 0; 1605 goto out; 1606 } 1607 1608 if (key->type != EAPOL_KEY_TYPE_WPA && key->type != EAPOL_KEY_TYPE_RSN) 1609 { 1610 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1611 "WPA: EAPOL-Key type (%d) unknown, discarded", 1612 key->type); 1613 ret = 0; 1614 goto out; 1615 } 1616 wpa_eapol_key_dump(sm, key); 1617 1618 eapol_sm_notify_lower_layer_success(sm->eapol, 0); 1619 wpa_hexdump(MSG_MSGDUMP, "WPA: RX EAPOL-Key", tmp, len); 1620 if (data_len < len) { 1621 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1622 "WPA: ignoring %lu bytes after the IEEE 802.1X data", 1623 (unsigned long) len - data_len); 1624 } 1625 key_info = WPA_GET_BE16(key->key_info); 1626 ver = key_info & WPA_KEY_INFO_TYPE_MASK; 1627 if (ver != WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 && 1628 #if defined(CONFIG_IEEE80211R) || defined(CONFIG_IEEE80211W) 1629 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC && 1630 #endif /* CONFIG_IEEE80211R || CONFIG_IEEE80211W */ 1631 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 1632 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1633 "WPA: Unsupported EAPOL-Key descriptor version %d", 1634 ver); 1635 goto out; 1636 } 1637 1638 #ifdef CONFIG_IEEE80211R 1639 if (wpa_key_mgmt_ft(sm->key_mgmt)) { 1640 /* IEEE 802.11r uses a new key_info type (AES-128-CMAC). */ 1641 if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) { 1642 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1643 "FT: AP did not use AES-128-CMAC"); 1644 goto out; 1645 } 1646 } else 1647 #endif /* CONFIG_IEEE80211R */ 1648 #ifdef CONFIG_IEEE80211W 1649 if (wpa_key_mgmt_sha256(sm->key_mgmt)) { 1650 if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) { 1651 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1652 "WPA: AP did not use the " 1653 "negotiated AES-128-CMAC"); 1654 goto out; 1655 } 1656 } else 1657 #endif /* CONFIG_IEEE80211W */ 1658 if (sm->pairwise_cipher == WPA_CIPHER_CCMP && 1659 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 1660 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1661 "WPA: CCMP is used, but EAPOL-Key " 1662 "descriptor version (%d) is not 2", ver); 1663 if (sm->group_cipher != WPA_CIPHER_CCMP && 1664 !(key_info & WPA_KEY_INFO_KEY_TYPE)) { 1665 /* Earlier versions of IEEE 802.11i did not explicitly 1666 * require version 2 descriptor for all EAPOL-Key 1667 * packets, so allow group keys to use version 1 if 1668 * CCMP is not used for them. */ 1669 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1670 "WPA: Backwards compatibility: allow invalid " 1671 "version for non-CCMP group keys"); 1672 } else 1673 goto out; 1674 } 1675 if (sm->pairwise_cipher == WPA_CIPHER_GCMP && 1676 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 1677 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1678 "WPA: GCMP is used, but EAPOL-Key " 1679 "descriptor version (%d) is not 2", ver); 1680 goto out; 1681 } 1682 1683 #ifdef CONFIG_PEERKEY 1684 for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) { 1685 if (os_memcmp(peerkey->addr, src_addr, ETH_ALEN) == 0) 1686 break; 1687 } 1688 1689 if (!(key_info & WPA_KEY_INFO_SMK_MESSAGE) && peerkey) { 1690 if (!peerkey->initiator && peerkey->replay_counter_set && 1691 os_memcmp(key->replay_counter, peerkey->replay_counter, 1692 WPA_REPLAY_COUNTER_LEN) <= 0) { 1693 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1694 "RSN: EAPOL-Key Replay Counter did not " 1695 "increase (STK) - dropping packet"); 1696 goto out; 1697 } else if (peerkey->initiator) { 1698 u8 _tmp[WPA_REPLAY_COUNTER_LEN]; 1699 os_memcpy(_tmp, key->replay_counter, 1700 WPA_REPLAY_COUNTER_LEN); 1701 inc_byte_array(_tmp, WPA_REPLAY_COUNTER_LEN); 1702 if (os_memcmp(_tmp, peerkey->replay_counter, 1703 WPA_REPLAY_COUNTER_LEN) != 0) { 1704 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1705 "RSN: EAPOL-Key Replay " 1706 "Counter did not match (STK) - " 1707 "dropping packet"); 1708 goto out; 1709 } 1710 } 1711 } 1712 1713 if (peerkey && peerkey->initiator && (key_info & WPA_KEY_INFO_ACK)) { 1714 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1715 "RSN: Ack bit in key_info from STK peer"); 1716 goto out; 1717 } 1718 #endif /* CONFIG_PEERKEY */ 1719 1720 if (!peerkey && sm->rx_replay_counter_set && 1721 os_memcmp(key->replay_counter, sm->rx_replay_counter, 1722 WPA_REPLAY_COUNTER_LEN) <= 0) { 1723 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1724 "WPA: EAPOL-Key Replay Counter did not increase - " 1725 "dropping packet"); 1726 goto out; 1727 } 1728 1729 if (!(key_info & (WPA_KEY_INFO_ACK | WPA_KEY_INFO_SMK_MESSAGE)) 1730 #ifdef CONFIG_PEERKEY 1731 && (peerkey == NULL || !peerkey->initiator) 1732 #endif /* CONFIG_PEERKEY */ 1733 ) { 1734 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1735 "WPA: No Ack bit in key_info"); 1736 goto out; 1737 } 1738 1739 if (key_info & WPA_KEY_INFO_REQUEST) { 1740 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1741 "WPA: EAPOL-Key with Request bit - dropped"); 1742 goto out; 1743 } 1744 1745 if ((key_info & WPA_KEY_INFO_MIC) && !peerkey && 1746 wpa_supplicant_verify_eapol_key_mic(sm, key, ver, tmp, data_len)) 1747 goto out; 1748 1749 #ifdef CONFIG_PEERKEY 1750 if ((key_info & WPA_KEY_INFO_MIC) && peerkey && 1751 peerkey_verify_eapol_key_mic(sm, peerkey, key, ver, tmp, data_len)) 1752 goto out; 1753 #endif /* CONFIG_PEERKEY */ 1754 1755 extra_len = data_len - sizeof(*hdr) - sizeof(*key); 1756 1757 if (WPA_GET_BE16(key->key_data_length) > extra_len) { 1758 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, "WPA: Invalid EAPOL-Key " 1759 "frame - key_data overflow (%d > %lu)", 1760 WPA_GET_BE16(key->key_data_length), 1761 (unsigned long) extra_len); 1762 goto out; 1763 } 1764 extra_len = WPA_GET_BE16(key->key_data_length); 1765 1766 if (sm->proto == WPA_PROTO_RSN && 1767 (key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) { 1768 if (wpa_supplicant_decrypt_key_data(sm, key, ver)) 1769 goto out; 1770 extra_len = WPA_GET_BE16(key->key_data_length); 1771 } 1772 1773 if (key_info & WPA_KEY_INFO_KEY_TYPE) { 1774 if (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) { 1775 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1776 "WPA: Ignored EAPOL-Key (Pairwise) with " 1777 "non-zero key index"); 1778 goto out; 1779 } 1780 if (peerkey) { 1781 /* PeerKey 4-Way Handshake */ 1782 peerkey_rx_eapol_4way(sm, peerkey, key, key_info, ver); 1783 } else if (key_info & WPA_KEY_INFO_MIC) { 1784 /* 3/4 4-Way Handshake */ 1785 wpa_supplicant_process_3_of_4(sm, key, ver); 1786 } else { 1787 /* 1/4 4-Way Handshake */ 1788 wpa_supplicant_process_1_of_4(sm, src_addr, key, 1789 ver); 1790 } 1791 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) { 1792 /* PeerKey SMK Handshake */ 1793 peerkey_rx_eapol_smk(sm, src_addr, key, extra_len, key_info, 1794 ver); 1795 } else { 1796 if (key_info & WPA_KEY_INFO_MIC) { 1797 /* 1/2 Group Key Handshake */ 1798 wpa_supplicant_process_1_of_2(sm, src_addr, key, 1799 extra_len, ver); 1800 } else { 1801 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1802 "WPA: EAPOL-Key (Group) without Mic bit - " 1803 "dropped"); 1804 } 1805 } 1806 1807 ret = 1; 1808 1809 out: 1810 os_free(tmp); 1811 return ret; 1812 } 1813 1814 1815 #ifdef CONFIG_CTRL_IFACE 1816 static u32 wpa_key_mgmt_suite(struct wpa_sm *sm) 1817 { 1818 switch (sm->key_mgmt) { 1819 case WPA_KEY_MGMT_IEEE8021X: 1820 return (sm->proto == WPA_PROTO_RSN ? 1821 RSN_AUTH_KEY_MGMT_UNSPEC_802_1X : 1822 WPA_AUTH_KEY_MGMT_UNSPEC_802_1X); 1823 case WPA_KEY_MGMT_PSK: 1824 return (sm->proto == WPA_PROTO_RSN ? 1825 RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X : 1826 WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X); 1827 #ifdef CONFIG_IEEE80211R 1828 case WPA_KEY_MGMT_FT_IEEE8021X: 1829 return RSN_AUTH_KEY_MGMT_FT_802_1X; 1830 case WPA_KEY_MGMT_FT_PSK: 1831 return RSN_AUTH_KEY_MGMT_FT_PSK; 1832 #endif /* CONFIG_IEEE80211R */ 1833 #ifdef CONFIG_IEEE80211W 1834 case WPA_KEY_MGMT_IEEE8021X_SHA256: 1835 return RSN_AUTH_KEY_MGMT_802_1X_SHA256; 1836 case WPA_KEY_MGMT_PSK_SHA256: 1837 return RSN_AUTH_KEY_MGMT_PSK_SHA256; 1838 #endif /* CONFIG_IEEE80211W */ 1839 case WPA_KEY_MGMT_CCKM: 1840 return (sm->proto == WPA_PROTO_RSN ? 1841 RSN_AUTH_KEY_MGMT_CCKM: 1842 WPA_AUTH_KEY_MGMT_CCKM); 1843 case WPA_KEY_MGMT_WPA_NONE: 1844 return WPA_AUTH_KEY_MGMT_NONE; 1845 default: 1846 return 0; 1847 } 1848 } 1849 1850 1851 #define RSN_SUITE "%02x-%02x-%02x-%d" 1852 #define RSN_SUITE_ARG(s) \ 1853 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff 1854 1855 /** 1856 * wpa_sm_get_mib - Dump text list of MIB entries 1857 * @sm: Pointer to WPA state machine data from wpa_sm_init() 1858 * @buf: Buffer for the list 1859 * @buflen: Length of the buffer 1860 * Returns: Number of bytes written to buffer 1861 * 1862 * This function is used fetch dot11 MIB variables. 1863 */ 1864 int wpa_sm_get_mib(struct wpa_sm *sm, char *buf, size_t buflen) 1865 { 1866 char pmkid_txt[PMKID_LEN * 2 + 1]; 1867 int rsna, ret; 1868 size_t len; 1869 1870 if (sm->cur_pmksa) { 1871 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt), 1872 sm->cur_pmksa->pmkid, PMKID_LEN); 1873 } else 1874 pmkid_txt[0] = '\0'; 1875 1876 if ((wpa_key_mgmt_wpa_psk(sm->key_mgmt) || 1877 wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt)) && 1878 sm->proto == WPA_PROTO_RSN) 1879 rsna = 1; 1880 else 1881 rsna = 0; 1882 1883 ret = os_snprintf(buf, buflen, 1884 "dot11RSNAOptionImplemented=TRUE\n" 1885 "dot11RSNAPreauthenticationImplemented=TRUE\n" 1886 "dot11RSNAEnabled=%s\n" 1887 "dot11RSNAPreauthenticationEnabled=%s\n" 1888 "dot11RSNAConfigVersion=%d\n" 1889 "dot11RSNAConfigPairwiseKeysSupported=5\n" 1890 "dot11RSNAConfigGroupCipherSize=%d\n" 1891 "dot11RSNAConfigPMKLifetime=%d\n" 1892 "dot11RSNAConfigPMKReauthThreshold=%d\n" 1893 "dot11RSNAConfigNumberOfPTKSAReplayCounters=1\n" 1894 "dot11RSNAConfigSATimeout=%d\n", 1895 rsna ? "TRUE" : "FALSE", 1896 rsna ? "TRUE" : "FALSE", 1897 RSN_VERSION, 1898 wpa_cipher_key_len(sm->group_cipher) * 8, 1899 sm->dot11RSNAConfigPMKLifetime, 1900 sm->dot11RSNAConfigPMKReauthThreshold, 1901 sm->dot11RSNAConfigSATimeout); 1902 if (ret < 0 || (size_t) ret >= buflen) 1903 return 0; 1904 len = ret; 1905 1906 ret = os_snprintf( 1907 buf + len, buflen - len, 1908 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n" 1909 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n" 1910 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n" 1911 "dot11RSNAPMKIDUsed=%s\n" 1912 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n" 1913 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n" 1914 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n" 1915 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n" 1916 "dot11RSNA4WayHandshakeFailures=%u\n", 1917 RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)), 1918 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto, 1919 sm->pairwise_cipher)), 1920 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto, 1921 sm->group_cipher)), 1922 pmkid_txt, 1923 RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)), 1924 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto, 1925 sm->pairwise_cipher)), 1926 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto, 1927 sm->group_cipher)), 1928 sm->dot11RSNA4WayHandshakeFailures); 1929 if (ret >= 0 && (size_t) ret < buflen) 1930 len += ret; 1931 1932 return (int) len; 1933 } 1934 #endif /* CONFIG_CTRL_IFACE */ 1935 1936 1937 static void wpa_sm_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry, 1938 void *ctx, enum pmksa_free_reason reason) 1939 { 1940 struct wpa_sm *sm = ctx; 1941 int deauth = 0; 1942 1943 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "RSN: PMKSA cache entry free_cb: " 1944 MACSTR " reason=%d", MAC2STR(entry->aa), reason); 1945 1946 if (sm->cur_pmksa == entry) { 1947 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1948 "RSN: %s current PMKSA entry", 1949 reason == PMKSA_REPLACE ? "replaced" : "removed"); 1950 pmksa_cache_clear_current(sm); 1951 1952 /* 1953 * If an entry is simply being replaced, there's no need to 1954 * deauthenticate because it will be immediately re-added. 1955 * This happens when EAP authentication is completed again 1956 * (reauth or failed PMKSA caching attempt). 1957 */ 1958 if (reason != PMKSA_REPLACE) 1959 deauth = 1; 1960 } 1961 1962 if (reason == PMKSA_EXPIRE && 1963 (sm->pmk_len == entry->pmk_len && 1964 os_memcmp(sm->pmk, entry->pmk, sm->pmk_len) == 0)) { 1965 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1966 "RSN: deauthenticating due to expired PMK"); 1967 pmksa_cache_clear_current(sm); 1968 deauth = 1; 1969 } 1970 1971 if (deauth) { 1972 os_memset(sm->pmk, 0, sizeof(sm->pmk)); 1973 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED); 1974 } 1975 } 1976 1977 1978 /** 1979 * wpa_sm_init - Initialize WPA state machine 1980 * @ctx: Context pointer for callbacks; this needs to be an allocated buffer 1981 * Returns: Pointer to the allocated WPA state machine data 1982 * 1983 * This function is used to allocate a new WPA state machine and the returned 1984 * value is passed to all WPA state machine calls. 1985 */ 1986 struct wpa_sm * wpa_sm_init(struct wpa_sm_ctx *ctx) 1987 { 1988 struct wpa_sm *sm; 1989 1990 sm = os_zalloc(sizeof(*sm)); 1991 if (sm == NULL) 1992 return NULL; 1993 dl_list_init(&sm->pmksa_candidates); 1994 sm->renew_snonce = 1; 1995 sm->ctx = ctx; 1996 1997 sm->dot11RSNAConfigPMKLifetime = 43200; 1998 sm->dot11RSNAConfigPMKReauthThreshold = 70; 1999 sm->dot11RSNAConfigSATimeout = 60; 2000 2001 sm->pmksa = pmksa_cache_init(wpa_sm_pmksa_free_cb, sm, sm); 2002 if (sm->pmksa == NULL) { 2003 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR, 2004 "RSN: PMKSA cache initialization failed"); 2005 os_free(sm); 2006 return NULL; 2007 } 2008 2009 return sm; 2010 } 2011 2012 2013 /** 2014 * wpa_sm_deinit - Deinitialize WPA state machine 2015 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2016 */ 2017 void wpa_sm_deinit(struct wpa_sm *sm) 2018 { 2019 if (sm == NULL) 2020 return; 2021 pmksa_cache_deinit(sm->pmksa); 2022 eloop_cancel_timeout(wpa_sm_start_preauth, sm, NULL); 2023 eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL); 2024 os_free(sm->assoc_wpa_ie); 2025 os_free(sm->ap_wpa_ie); 2026 os_free(sm->ap_rsn_ie); 2027 os_free(sm->ctx); 2028 peerkey_deinit(sm); 2029 #ifdef CONFIG_IEEE80211R 2030 os_free(sm->assoc_resp_ies); 2031 #endif /* CONFIG_IEEE80211R */ 2032 os_free(sm); 2033 } 2034 2035 2036 /** 2037 * wpa_sm_notify_assoc - Notify WPA state machine about association 2038 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2039 * @bssid: The BSSID of the new association 2040 * 2041 * This function is called to let WPA state machine know that the connection 2042 * was established. 2043 */ 2044 void wpa_sm_notify_assoc(struct wpa_sm *sm, const u8 *bssid) 2045 { 2046 int clear_ptk = 1; 2047 2048 if (sm == NULL) 2049 return; 2050 2051 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 2052 "WPA: Association event - clear replay counter"); 2053 os_memcpy(sm->bssid, bssid, ETH_ALEN); 2054 os_memset(sm->rx_replay_counter, 0, WPA_REPLAY_COUNTER_LEN); 2055 sm->rx_replay_counter_set = 0; 2056 sm->renew_snonce = 1; 2057 if (os_memcmp(sm->preauth_bssid, bssid, ETH_ALEN) == 0) 2058 rsn_preauth_deinit(sm); 2059 2060 #ifdef CONFIG_IEEE80211R 2061 if (wpa_ft_is_completed(sm)) { 2062 /* 2063 * Clear portValid to kick EAPOL state machine to re-enter 2064 * AUTHENTICATED state to get the EAPOL port Authorized. 2065 */ 2066 eapol_sm_notify_portValid(sm->eapol, FALSE); 2067 wpa_supplicant_key_neg_complete(sm, sm->bssid, 1); 2068 2069 /* Prepare for the next transition */ 2070 wpa_ft_prepare_auth_request(sm, NULL); 2071 2072 clear_ptk = 0; 2073 } 2074 #endif /* CONFIG_IEEE80211R */ 2075 2076 if (clear_ptk) { 2077 /* 2078 * IEEE 802.11, 8.4.10: Delete PTK SA on (re)association if 2079 * this is not part of a Fast BSS Transition. 2080 */ 2081 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Clear old PTK"); 2082 sm->ptk_set = 0; 2083 sm->tptk_set = 0; 2084 } 2085 2086 #ifdef CONFIG_TDLS 2087 wpa_tdls_assoc(sm); 2088 #endif /* CONFIG_TDLS */ 2089 } 2090 2091 2092 /** 2093 * wpa_sm_notify_disassoc - Notify WPA state machine about disassociation 2094 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2095 * 2096 * This function is called to let WPA state machine know that the connection 2097 * was lost. This will abort any existing pre-authentication session. 2098 */ 2099 void wpa_sm_notify_disassoc(struct wpa_sm *sm) 2100 { 2101 rsn_preauth_deinit(sm); 2102 pmksa_cache_clear_current(sm); 2103 if (wpa_sm_get_state(sm) == WPA_4WAY_HANDSHAKE) 2104 sm->dot11RSNA4WayHandshakeFailures++; 2105 #ifdef CONFIG_TDLS 2106 wpa_tdls_disassoc(sm); 2107 #endif /* CONFIG_TDLS */ 2108 } 2109 2110 2111 /** 2112 * wpa_sm_set_pmk - Set PMK 2113 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2114 * @pmk: The new PMK 2115 * @pmk_len: The length of the new PMK in bytes 2116 * 2117 * Configure the PMK for WPA state machine. 2118 */ 2119 void wpa_sm_set_pmk(struct wpa_sm *sm, const u8 *pmk, size_t pmk_len) 2120 { 2121 if (sm == NULL) 2122 return; 2123 2124 sm->pmk_len = pmk_len; 2125 os_memcpy(sm->pmk, pmk, pmk_len); 2126 2127 #ifdef CONFIG_IEEE80211R 2128 /* Set XXKey to be PSK for FT key derivation */ 2129 sm->xxkey_len = pmk_len; 2130 os_memcpy(sm->xxkey, pmk, pmk_len); 2131 #endif /* CONFIG_IEEE80211R */ 2132 } 2133 2134 2135 /** 2136 * wpa_sm_set_pmk_from_pmksa - Set PMK based on the current PMKSA 2137 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2138 * 2139 * Take the PMK from the current PMKSA into use. If no PMKSA is active, the PMK 2140 * will be cleared. 2141 */ 2142 void wpa_sm_set_pmk_from_pmksa(struct wpa_sm *sm) 2143 { 2144 if (sm == NULL) 2145 return; 2146 2147 if (sm->cur_pmksa) { 2148 sm->pmk_len = sm->cur_pmksa->pmk_len; 2149 os_memcpy(sm->pmk, sm->cur_pmksa->pmk, sm->pmk_len); 2150 } else { 2151 sm->pmk_len = PMK_LEN; 2152 os_memset(sm->pmk, 0, PMK_LEN); 2153 } 2154 } 2155 2156 2157 /** 2158 * wpa_sm_set_fast_reauth - Set fast reauthentication (EAP) enabled/disabled 2159 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2160 * @fast_reauth: Whether fast reauthentication (EAP) is allowed 2161 */ 2162 void wpa_sm_set_fast_reauth(struct wpa_sm *sm, int fast_reauth) 2163 { 2164 if (sm) 2165 sm->fast_reauth = fast_reauth; 2166 } 2167 2168 2169 /** 2170 * wpa_sm_set_scard_ctx - Set context pointer for smartcard callbacks 2171 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2172 * @scard_ctx: Context pointer for smartcard related callback functions 2173 */ 2174 void wpa_sm_set_scard_ctx(struct wpa_sm *sm, void *scard_ctx) 2175 { 2176 if (sm == NULL) 2177 return; 2178 sm->scard_ctx = scard_ctx; 2179 if (sm->preauth_eapol) 2180 eapol_sm_register_scard_ctx(sm->preauth_eapol, scard_ctx); 2181 } 2182 2183 2184 /** 2185 * wpa_sm_set_config - Notification of current configration change 2186 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2187 * @config: Pointer to current network configuration 2188 * 2189 * Notify WPA state machine that configuration has changed. config will be 2190 * stored as a backpointer to network configuration. This can be %NULL to clear 2191 * the stored pointed. 2192 */ 2193 void wpa_sm_set_config(struct wpa_sm *sm, struct rsn_supp_config *config) 2194 { 2195 if (!sm) 2196 return; 2197 2198 if (config) { 2199 sm->network_ctx = config->network_ctx; 2200 sm->peerkey_enabled = config->peerkey_enabled; 2201 sm->allowed_pairwise_cipher = config->allowed_pairwise_cipher; 2202 sm->proactive_key_caching = config->proactive_key_caching; 2203 sm->eap_workaround = config->eap_workaround; 2204 sm->eap_conf_ctx = config->eap_conf_ctx; 2205 if (config->ssid) { 2206 os_memcpy(sm->ssid, config->ssid, config->ssid_len); 2207 sm->ssid_len = config->ssid_len; 2208 } else 2209 sm->ssid_len = 0; 2210 sm->wpa_ptk_rekey = config->wpa_ptk_rekey; 2211 } else { 2212 sm->network_ctx = NULL; 2213 sm->peerkey_enabled = 0; 2214 sm->allowed_pairwise_cipher = 0; 2215 sm->proactive_key_caching = 0; 2216 sm->eap_workaround = 0; 2217 sm->eap_conf_ctx = NULL; 2218 sm->ssid_len = 0; 2219 sm->wpa_ptk_rekey = 0; 2220 } 2221 } 2222 2223 2224 /** 2225 * wpa_sm_set_own_addr - Set own MAC address 2226 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2227 * @addr: Own MAC address 2228 */ 2229 void wpa_sm_set_own_addr(struct wpa_sm *sm, const u8 *addr) 2230 { 2231 if (sm) 2232 os_memcpy(sm->own_addr, addr, ETH_ALEN); 2233 } 2234 2235 2236 /** 2237 * wpa_sm_set_ifname - Set network interface name 2238 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2239 * @ifname: Interface name 2240 * @bridge_ifname: Optional bridge interface name (for pre-auth) 2241 */ 2242 void wpa_sm_set_ifname(struct wpa_sm *sm, const char *ifname, 2243 const char *bridge_ifname) 2244 { 2245 if (sm) { 2246 sm->ifname = ifname; 2247 sm->bridge_ifname = bridge_ifname; 2248 } 2249 } 2250 2251 2252 /** 2253 * wpa_sm_set_eapol - Set EAPOL state machine pointer 2254 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2255 * @eapol: Pointer to EAPOL state machine allocated with eapol_sm_init() 2256 */ 2257 void wpa_sm_set_eapol(struct wpa_sm *sm, struct eapol_sm *eapol) 2258 { 2259 if (sm) 2260 sm->eapol = eapol; 2261 } 2262 2263 2264 /** 2265 * wpa_sm_set_param - Set WPA state machine parameters 2266 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2267 * @param: Parameter field 2268 * @value: Parameter value 2269 * Returns: 0 on success, -1 on failure 2270 */ 2271 int wpa_sm_set_param(struct wpa_sm *sm, enum wpa_sm_conf_params param, 2272 unsigned int value) 2273 { 2274 int ret = 0; 2275 2276 if (sm == NULL) 2277 return -1; 2278 2279 switch (param) { 2280 case RSNA_PMK_LIFETIME: 2281 if (value > 0) 2282 sm->dot11RSNAConfigPMKLifetime = value; 2283 else 2284 ret = -1; 2285 break; 2286 case RSNA_PMK_REAUTH_THRESHOLD: 2287 if (value > 0 && value <= 100) 2288 sm->dot11RSNAConfigPMKReauthThreshold = value; 2289 else 2290 ret = -1; 2291 break; 2292 case RSNA_SA_TIMEOUT: 2293 if (value > 0) 2294 sm->dot11RSNAConfigSATimeout = value; 2295 else 2296 ret = -1; 2297 break; 2298 case WPA_PARAM_PROTO: 2299 sm->proto = value; 2300 break; 2301 case WPA_PARAM_PAIRWISE: 2302 sm->pairwise_cipher = value; 2303 break; 2304 case WPA_PARAM_GROUP: 2305 sm->group_cipher = value; 2306 break; 2307 case WPA_PARAM_KEY_MGMT: 2308 sm->key_mgmt = value; 2309 break; 2310 #ifdef CONFIG_IEEE80211W 2311 case WPA_PARAM_MGMT_GROUP: 2312 sm->mgmt_group_cipher = value; 2313 break; 2314 #endif /* CONFIG_IEEE80211W */ 2315 case WPA_PARAM_RSN_ENABLED: 2316 sm->rsn_enabled = value; 2317 break; 2318 case WPA_PARAM_MFP: 2319 sm->mfp = value; 2320 break; 2321 default: 2322 break; 2323 } 2324 2325 return ret; 2326 } 2327 2328 2329 /** 2330 * wpa_sm_get_param - Get WPA state machine parameters 2331 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2332 * @param: Parameter field 2333 * Returns: Parameter value 2334 */ 2335 unsigned int wpa_sm_get_param(struct wpa_sm *sm, enum wpa_sm_conf_params param) 2336 { 2337 if (sm == NULL) 2338 return 0; 2339 2340 switch (param) { 2341 case RSNA_PMK_LIFETIME: 2342 return sm->dot11RSNAConfigPMKLifetime; 2343 case RSNA_PMK_REAUTH_THRESHOLD: 2344 return sm->dot11RSNAConfigPMKReauthThreshold; 2345 case RSNA_SA_TIMEOUT: 2346 return sm->dot11RSNAConfigSATimeout; 2347 case WPA_PARAM_PROTO: 2348 return sm->proto; 2349 case WPA_PARAM_PAIRWISE: 2350 return sm->pairwise_cipher; 2351 case WPA_PARAM_GROUP: 2352 return sm->group_cipher; 2353 case WPA_PARAM_KEY_MGMT: 2354 return sm->key_mgmt; 2355 #ifdef CONFIG_IEEE80211W 2356 case WPA_PARAM_MGMT_GROUP: 2357 return sm->mgmt_group_cipher; 2358 #endif /* CONFIG_IEEE80211W */ 2359 case WPA_PARAM_RSN_ENABLED: 2360 return sm->rsn_enabled; 2361 default: 2362 return 0; 2363 } 2364 } 2365 2366 2367 /** 2368 * wpa_sm_get_status - Get WPA state machine 2369 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2370 * @buf: Buffer for status information 2371 * @buflen: Maximum buffer length 2372 * @verbose: Whether to include verbose status information 2373 * Returns: Number of bytes written to buf. 2374 * 2375 * Query WPA state machine for status information. This function fills in 2376 * a text area with current status information. If the buffer (buf) is not 2377 * large enough, status information will be truncated to fit the buffer. 2378 */ 2379 int wpa_sm_get_status(struct wpa_sm *sm, char *buf, size_t buflen, 2380 int verbose) 2381 { 2382 char *pos = buf, *end = buf + buflen; 2383 int ret; 2384 2385 ret = os_snprintf(pos, end - pos, 2386 "pairwise_cipher=%s\n" 2387 "group_cipher=%s\n" 2388 "key_mgmt=%s\n", 2389 wpa_cipher_txt(sm->pairwise_cipher), 2390 wpa_cipher_txt(sm->group_cipher), 2391 wpa_key_mgmt_txt(sm->key_mgmt, sm->proto)); 2392 if (ret < 0 || ret >= end - pos) 2393 return pos - buf; 2394 pos += ret; 2395 2396 if (sm->mfp != NO_MGMT_FRAME_PROTECTION && sm->ap_rsn_ie) { 2397 struct wpa_ie_data rsn; 2398 if (wpa_parse_wpa_ie_rsn(sm->ap_rsn_ie, sm->ap_rsn_ie_len, &rsn) 2399 >= 0 && 2400 rsn.capabilities & (WPA_CAPABILITY_MFPR | 2401 WPA_CAPABILITY_MFPC)) { 2402 ret = os_snprintf(pos, end - pos, "pmf=%d\n", 2403 (rsn.capabilities & 2404 WPA_CAPABILITY_MFPR) ? 2 : 1); 2405 if (ret < 0 || ret >= end - pos) 2406 return pos - buf; 2407 pos += ret; 2408 } 2409 } 2410 2411 return pos - buf; 2412 } 2413 2414 2415 /** 2416 * wpa_sm_set_assoc_wpa_ie_default - Generate own WPA/RSN IE from configuration 2417 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2418 * @wpa_ie: Pointer to buffer for WPA/RSN IE 2419 * @wpa_ie_len: Pointer to the length of the wpa_ie buffer 2420 * Returns: 0 on success, -1 on failure 2421 */ 2422 int wpa_sm_set_assoc_wpa_ie_default(struct wpa_sm *sm, u8 *wpa_ie, 2423 size_t *wpa_ie_len) 2424 { 2425 int res; 2426 2427 if (sm == NULL) 2428 return -1; 2429 2430 res = wpa_gen_wpa_ie(sm, wpa_ie, *wpa_ie_len); 2431 if (res < 0) 2432 return -1; 2433 *wpa_ie_len = res; 2434 2435 wpa_hexdump(MSG_DEBUG, "WPA: Set own WPA IE default", 2436 wpa_ie, *wpa_ie_len); 2437 2438 if (sm->assoc_wpa_ie == NULL) { 2439 /* 2440 * Make a copy of the WPA/RSN IE so that 4-Way Handshake gets 2441 * the correct version of the IE even if PMKSA caching is 2442 * aborted (which would remove PMKID from IE generation). 2443 */ 2444 sm->assoc_wpa_ie = os_malloc(*wpa_ie_len); 2445 if (sm->assoc_wpa_ie == NULL) 2446 return -1; 2447 2448 os_memcpy(sm->assoc_wpa_ie, wpa_ie, *wpa_ie_len); 2449 sm->assoc_wpa_ie_len = *wpa_ie_len; 2450 } 2451 2452 return 0; 2453 } 2454 2455 2456 /** 2457 * wpa_sm_set_assoc_wpa_ie - Set own WPA/RSN IE from (Re)AssocReq 2458 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2459 * @ie: Pointer to IE data (starting from id) 2460 * @len: IE length 2461 * Returns: 0 on success, -1 on failure 2462 * 2463 * Inform WPA state machine about the WPA/RSN IE used in (Re)Association 2464 * Request frame. The IE will be used to override the default value generated 2465 * with wpa_sm_set_assoc_wpa_ie_default(). 2466 */ 2467 int wpa_sm_set_assoc_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len) 2468 { 2469 if (sm == NULL) 2470 return -1; 2471 2472 os_free(sm->assoc_wpa_ie); 2473 if (ie == NULL || len == 0) { 2474 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 2475 "WPA: clearing own WPA/RSN IE"); 2476 sm->assoc_wpa_ie = NULL; 2477 sm->assoc_wpa_ie_len = 0; 2478 } else { 2479 wpa_hexdump(MSG_DEBUG, "WPA: set own WPA/RSN IE", ie, len); 2480 sm->assoc_wpa_ie = os_malloc(len); 2481 if (sm->assoc_wpa_ie == NULL) 2482 return -1; 2483 2484 os_memcpy(sm->assoc_wpa_ie, ie, len); 2485 sm->assoc_wpa_ie_len = len; 2486 } 2487 2488 return 0; 2489 } 2490 2491 2492 /** 2493 * wpa_sm_set_ap_wpa_ie - Set AP WPA IE from Beacon/ProbeResp 2494 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2495 * @ie: Pointer to IE data (starting from id) 2496 * @len: IE length 2497 * Returns: 0 on success, -1 on failure 2498 * 2499 * Inform WPA state machine about the WPA IE used in Beacon / Probe Response 2500 * frame. 2501 */ 2502 int wpa_sm_set_ap_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len) 2503 { 2504 if (sm == NULL) 2505 return -1; 2506 2507 os_free(sm->ap_wpa_ie); 2508 if (ie == NULL || len == 0) { 2509 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 2510 "WPA: clearing AP WPA IE"); 2511 sm->ap_wpa_ie = NULL; 2512 sm->ap_wpa_ie_len = 0; 2513 } else { 2514 wpa_hexdump(MSG_DEBUG, "WPA: set AP WPA IE", ie, len); 2515 sm->ap_wpa_ie = os_malloc(len); 2516 if (sm->ap_wpa_ie == NULL) 2517 return -1; 2518 2519 os_memcpy(sm->ap_wpa_ie, ie, len); 2520 sm->ap_wpa_ie_len = len; 2521 } 2522 2523 return 0; 2524 } 2525 2526 2527 /** 2528 * wpa_sm_set_ap_rsn_ie - Set AP RSN IE from Beacon/ProbeResp 2529 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2530 * @ie: Pointer to IE data (starting from id) 2531 * @len: IE length 2532 * Returns: 0 on success, -1 on failure 2533 * 2534 * Inform WPA state machine about the RSN IE used in Beacon / Probe Response 2535 * frame. 2536 */ 2537 int wpa_sm_set_ap_rsn_ie(struct wpa_sm *sm, const u8 *ie, size_t len) 2538 { 2539 if (sm == NULL) 2540 return -1; 2541 2542 os_free(sm->ap_rsn_ie); 2543 if (ie == NULL || len == 0) { 2544 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 2545 "WPA: clearing AP RSN IE"); 2546 sm->ap_rsn_ie = NULL; 2547 sm->ap_rsn_ie_len = 0; 2548 } else { 2549 wpa_hexdump(MSG_DEBUG, "WPA: set AP RSN IE", ie, len); 2550 sm->ap_rsn_ie = os_malloc(len); 2551 if (sm->ap_rsn_ie == NULL) 2552 return -1; 2553 2554 os_memcpy(sm->ap_rsn_ie, ie, len); 2555 sm->ap_rsn_ie_len = len; 2556 } 2557 2558 return 0; 2559 } 2560 2561 2562 /** 2563 * wpa_sm_parse_own_wpa_ie - Parse own WPA/RSN IE 2564 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2565 * @data: Pointer to data area for parsing results 2566 * Returns: 0 on success, -1 if IE is not known, or -2 on parsing failure 2567 * 2568 * Parse the contents of the own WPA or RSN IE from (Re)AssocReq and write the 2569 * parsed data into data. 2570 */ 2571 int wpa_sm_parse_own_wpa_ie(struct wpa_sm *sm, struct wpa_ie_data *data) 2572 { 2573 if (sm == NULL) 2574 return -1; 2575 2576 if (sm->assoc_wpa_ie == NULL) { 2577 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 2578 "WPA: No WPA/RSN IE available from association info"); 2579 return -1; 2580 } 2581 if (wpa_parse_wpa_ie(sm->assoc_wpa_ie, sm->assoc_wpa_ie_len, data)) 2582 return -2; 2583 return 0; 2584 } 2585 2586 2587 int wpa_sm_pmksa_cache_list(struct wpa_sm *sm, char *buf, size_t len) 2588 { 2589 #ifndef CONFIG_NO_WPA2 2590 return pmksa_cache_list(sm->pmksa, buf, len); 2591 #else /* CONFIG_NO_WPA2 */ 2592 return -1; 2593 #endif /* CONFIG_NO_WPA2 */ 2594 } 2595 2596 2597 void wpa_sm_drop_sa(struct wpa_sm *sm) 2598 { 2599 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Clear old PMK and PTK"); 2600 sm->ptk_set = 0; 2601 sm->tptk_set = 0; 2602 os_memset(sm->pmk, 0, sizeof(sm->pmk)); 2603 os_memset(&sm->ptk, 0, sizeof(sm->ptk)); 2604 os_memset(&sm->tptk, 0, sizeof(sm->tptk)); 2605 } 2606 2607 2608 int wpa_sm_has_ptk(struct wpa_sm *sm) 2609 { 2610 if (sm == NULL) 2611 return 0; 2612 return sm->ptk_set; 2613 } 2614 2615 2616 void wpa_sm_update_replay_ctr(struct wpa_sm *sm, const u8 *replay_ctr) 2617 { 2618 os_memcpy(sm->rx_replay_counter, replay_ctr, WPA_REPLAY_COUNTER_LEN); 2619 } 2620 2621 2622 void wpa_sm_pmksa_cache_flush(struct wpa_sm *sm, void *network_ctx) 2623 { 2624 #ifndef CONFIG_NO_WPA2 2625 pmksa_cache_flush(sm->pmksa, network_ctx); 2626 #endif /* CONFIG_NO_WPA2 */ 2627 } 2628 2629 2630 #ifdef CONFIG_WNM 2631 int wpa_wnmsleep_install_key(struct wpa_sm *sm, u8 subelem_id, u8 *buf) 2632 { 2633 struct wpa_gtk_data gd; 2634 #ifdef CONFIG_IEEE80211W 2635 struct wpa_igtk_kde igd; 2636 u16 keyidx; 2637 #endif /* CONFIG_IEEE80211W */ 2638 u16 keyinfo; 2639 u8 keylen; /* plaintext key len */ 2640 u8 *key_rsc; 2641 2642 os_memset(&gd, 0, sizeof(gd)); 2643 #ifdef CONFIG_IEEE80211W 2644 os_memset(&igd, 0, sizeof(igd)); 2645 #endif /* CONFIG_IEEE80211W */ 2646 2647 keylen = wpa_cipher_key_len(sm->group_cipher); 2648 gd.key_rsc_len = wpa_cipher_rsc_len(sm->group_cipher); 2649 gd.alg = wpa_cipher_to_alg(sm->group_cipher); 2650 if (gd.alg == WPA_ALG_NONE) { 2651 wpa_printf(MSG_DEBUG, "Unsupported group cipher suite"); 2652 return -1; 2653 } 2654 2655 if (subelem_id == WNM_SLEEP_SUBELEM_GTK) { 2656 key_rsc = buf + 5; 2657 keyinfo = WPA_GET_LE16(buf + 2); 2658 gd.gtk_len = keylen; 2659 if (gd.gtk_len != buf[4]) { 2660 wpa_printf(MSG_DEBUG, "GTK len mismatch len %d vs %d", 2661 gd.gtk_len, buf[4]); 2662 return -1; 2663 } 2664 gd.keyidx = keyinfo & 0x03; /* B0 - B1 */ 2665 gd.tx = wpa_supplicant_gtk_tx_bit_workaround( 2666 sm, !!(keyinfo & WPA_KEY_INFO_TXRX)); 2667 2668 os_memcpy(gd.gtk, buf + 13, gd.gtk_len); 2669 2670 wpa_hexdump_key(MSG_DEBUG, "Install GTK (WNM SLEEP)", 2671 gd.gtk, gd.gtk_len); 2672 if (wpa_supplicant_install_gtk(sm, &gd, key_rsc)) { 2673 wpa_printf(MSG_DEBUG, "Failed to install the GTK in " 2674 "WNM mode"); 2675 return -1; 2676 } 2677 #ifdef CONFIG_IEEE80211W 2678 } else if (subelem_id == WNM_SLEEP_SUBELEM_IGTK) { 2679 os_memcpy(igd.keyid, buf + 2, 2); 2680 os_memcpy(igd.pn, buf + 4, 6); 2681 2682 keyidx = WPA_GET_LE16(igd.keyid); 2683 os_memcpy(igd.igtk, buf + 10, WPA_IGTK_LEN); 2684 2685 wpa_hexdump_key(MSG_DEBUG, "Install IGTK (WNM SLEEP)", 2686 igd.igtk, WPA_IGTK_LEN); 2687 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, 2688 keyidx, 0, igd.pn, sizeof(igd.pn), 2689 igd.igtk, WPA_IGTK_LEN) < 0) { 2690 wpa_printf(MSG_DEBUG, "Failed to install the IGTK in " 2691 "WNM mode"); 2692 return -1; 2693 } 2694 #endif /* CONFIG_IEEE80211W */ 2695 } else { 2696 wpa_printf(MSG_DEBUG, "Unknown element id"); 2697 return -1; 2698 } 2699 2700 return 0; 2701 } 2702 #endif /* CONFIG_WNM */ 2703