1 /* 2 * WPA Supplicant - WPA state machine and EAPOL-Key processing 3 * Copyright (c) 2003-2012, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "includes.h" 10 11 #include "common.h" 12 #include "crypto/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 if (sm->proto == WPA_PROTO_RSN) { 396 /* RSN: msg 1/4 should contain PMKID for the selected PMK */ 397 const u8 *_buf = (const u8 *) (key + 1); 398 size_t len = WPA_GET_BE16(key->key_data_length); 399 wpa_hexdump(MSG_DEBUG, "RSN: msg 1/4 key data", _buf, len); 400 if (wpa_supplicant_parse_ies(_buf, len, &ie) < 0) 401 goto failed; 402 if (ie.pmkid) { 403 wpa_hexdump(MSG_DEBUG, "RSN: PMKID from " 404 "Authenticator", ie.pmkid, PMKID_LEN); 405 } 406 } 407 408 res = wpa_supplicant_get_pmk(sm, src_addr, ie.pmkid); 409 if (res == -2) { 410 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "RSN: Do not reply to " 411 "msg 1/4 - requesting full EAP authentication"); 412 return; 413 } 414 if (res) 415 goto failed; 416 417 if (sm->renew_snonce) { 418 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) { 419 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 420 "WPA: Failed to get random data for SNonce"); 421 goto failed; 422 } 423 sm->renew_snonce = 0; 424 wpa_hexdump(MSG_DEBUG, "WPA: Renewed SNonce", 425 sm->snonce, WPA_NONCE_LEN); 426 } 427 428 /* Calculate PTK which will be stored as a temporary PTK until it has 429 * been verified when processing message 3/4. */ 430 ptk = &sm->tptk; 431 wpa_derive_ptk(sm, src_addr, key, ptk); 432 /* Supplicant: swap tx/rx Mic keys */ 433 os_memcpy(buf, ptk->u.auth.tx_mic_key, 8); 434 os_memcpy(ptk->u.auth.tx_mic_key, ptk->u.auth.rx_mic_key, 8); 435 os_memcpy(ptk->u.auth.rx_mic_key, buf, 8); 436 sm->tptk_set = 1; 437 438 if (wpa_supplicant_send_2_of_4(sm, sm->bssid, key, ver, sm->snonce, 439 sm->assoc_wpa_ie, sm->assoc_wpa_ie_len, 440 ptk)) 441 goto failed; 442 443 os_memcpy(sm->anonce, key->key_nonce, WPA_NONCE_LEN); 444 return; 445 446 failed: 447 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED); 448 } 449 450 451 static void wpa_sm_start_preauth(void *eloop_ctx, void *timeout_ctx) 452 { 453 struct wpa_sm *sm = eloop_ctx; 454 rsn_preauth_candidate_process(sm); 455 } 456 457 458 static void wpa_supplicant_key_neg_complete(struct wpa_sm *sm, 459 const u8 *addr, int secure) 460 { 461 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 462 "WPA: Key negotiation completed with " 463 MACSTR " [PTK=%s GTK=%s]", MAC2STR(addr), 464 wpa_cipher_txt(sm->pairwise_cipher), 465 wpa_cipher_txt(sm->group_cipher)); 466 wpa_sm_cancel_auth_timeout(sm); 467 wpa_sm_set_state(sm, WPA_COMPLETED); 468 469 if (secure) { 470 wpa_sm_mlme_setprotection( 471 sm, addr, MLME_SETPROTECTION_PROTECT_TYPE_RX_TX, 472 MLME_SETPROTECTION_KEY_TYPE_PAIRWISE); 473 eapol_sm_notify_portValid(sm->eapol, TRUE); 474 if (wpa_key_mgmt_wpa_psk(sm->key_mgmt)) 475 eapol_sm_notify_eap_success(sm->eapol, TRUE); 476 /* 477 * Start preauthentication after a short wait to avoid a 478 * possible race condition between the data receive and key 479 * configuration after the 4-Way Handshake. This increases the 480 * likelihood of the first preauth EAPOL-Start frame getting to 481 * the target AP. 482 */ 483 eloop_register_timeout(1, 0, wpa_sm_start_preauth, sm, NULL); 484 } 485 486 if (sm->cur_pmksa && sm->cur_pmksa->opportunistic) { 487 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 488 "RSN: Authenticator accepted " 489 "opportunistic PMKSA entry - marking it valid"); 490 sm->cur_pmksa->opportunistic = 0; 491 } 492 493 #ifdef CONFIG_IEEE80211R 494 if (wpa_key_mgmt_ft(sm->key_mgmt)) { 495 /* Prepare for the next transition */ 496 wpa_ft_prepare_auth_request(sm, NULL); 497 } 498 #endif /* CONFIG_IEEE80211R */ 499 } 500 501 502 static void wpa_sm_rekey_ptk(void *eloop_ctx, void *timeout_ctx) 503 { 504 struct wpa_sm *sm = eloop_ctx; 505 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Request PTK rekeying"); 506 wpa_sm_key_request(sm, 0, 1); 507 } 508 509 510 static int wpa_supplicant_install_ptk(struct wpa_sm *sm, 511 const struct wpa_eapol_key *key) 512 { 513 int keylen, rsclen; 514 enum wpa_alg alg; 515 const u8 *key_rsc; 516 u8 null_rsc[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 517 518 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 519 "WPA: Installing PTK to the driver"); 520 521 if (sm->pairwise_cipher == WPA_CIPHER_NONE) { 522 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Pairwise Cipher " 523 "Suite: NONE - do not use pairwise keys"); 524 return 0; 525 } 526 527 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) { 528 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 529 "WPA: Unsupported pairwise cipher %d", 530 sm->pairwise_cipher); 531 return -1; 532 } 533 534 alg = wpa_cipher_to_alg(sm->pairwise_cipher); 535 keylen = wpa_cipher_key_len(sm->pairwise_cipher); 536 rsclen = wpa_cipher_rsc_len(sm->pairwise_cipher); 537 538 if (sm->proto == WPA_PROTO_RSN) { 539 key_rsc = null_rsc; 540 } else { 541 key_rsc = key->key_rsc; 542 wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, rsclen); 543 } 544 545 if (wpa_sm_set_key(sm, alg, sm->bssid, 0, 1, key_rsc, rsclen, 546 (u8 *) sm->ptk.tk1, keylen) < 0) { 547 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 548 "WPA: Failed to set PTK to the " 549 "driver (alg=%d keylen=%d bssid=" MACSTR ")", 550 alg, keylen, MAC2STR(sm->bssid)); 551 return -1; 552 } 553 554 if (sm->wpa_ptk_rekey) { 555 eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL); 556 eloop_register_timeout(sm->wpa_ptk_rekey, 0, wpa_sm_rekey_ptk, 557 sm, NULL); 558 } 559 560 return 0; 561 } 562 563 564 static int wpa_supplicant_check_group_cipher(struct wpa_sm *sm, 565 int group_cipher, 566 int keylen, int maxkeylen, 567 int *key_rsc_len, 568 enum wpa_alg *alg) 569 { 570 int klen; 571 572 *alg = wpa_cipher_to_alg(group_cipher); 573 if (*alg == WPA_ALG_NONE) { 574 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 575 "WPA: Unsupported Group Cipher %d", 576 group_cipher); 577 return -1; 578 } 579 *key_rsc_len = wpa_cipher_rsc_len(group_cipher); 580 581 klen = wpa_cipher_key_len(group_cipher); 582 if (keylen != klen || maxkeylen < klen) { 583 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 584 "WPA: Unsupported %s Group Cipher key length %d (%d)", 585 wpa_cipher_txt(group_cipher), keylen, maxkeylen); 586 return -1; 587 } 588 return 0; 589 } 590 591 592 struct wpa_gtk_data { 593 enum wpa_alg alg; 594 int tx, key_rsc_len, keyidx; 595 u8 gtk[32]; 596 int gtk_len; 597 }; 598 599 600 static int wpa_supplicant_install_gtk(struct wpa_sm *sm, 601 const struct wpa_gtk_data *gd, 602 const u8 *key_rsc) 603 { 604 const u8 *_gtk = gd->gtk; 605 u8 gtk_buf[32]; 606 607 wpa_hexdump_key(MSG_DEBUG, "WPA: Group Key", gd->gtk, gd->gtk_len); 608 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 609 "WPA: Installing GTK to the driver (keyidx=%d tx=%d len=%d)", 610 gd->keyidx, gd->tx, gd->gtk_len); 611 wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, gd->key_rsc_len); 612 if (sm->group_cipher == WPA_CIPHER_TKIP) { 613 /* Swap Tx/Rx keys for Michael MIC */ 614 os_memcpy(gtk_buf, gd->gtk, 16); 615 os_memcpy(gtk_buf + 16, gd->gtk + 24, 8); 616 os_memcpy(gtk_buf + 24, gd->gtk + 16, 8); 617 _gtk = gtk_buf; 618 } 619 if (sm->pairwise_cipher == WPA_CIPHER_NONE) { 620 if (wpa_sm_set_key(sm, gd->alg, NULL, 621 gd->keyidx, 1, key_rsc, gd->key_rsc_len, 622 _gtk, gd->gtk_len) < 0) { 623 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 624 "WPA: Failed to set GTK to the driver " 625 "(Group only)"); 626 return -1; 627 } 628 } else if (wpa_sm_set_key(sm, gd->alg, broadcast_ether_addr, 629 gd->keyidx, gd->tx, key_rsc, gd->key_rsc_len, 630 _gtk, gd->gtk_len) < 0) { 631 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 632 "WPA: Failed to set GTK to " 633 "the driver (alg=%d keylen=%d keyidx=%d)", 634 gd->alg, gd->gtk_len, gd->keyidx); 635 return -1; 636 } 637 638 return 0; 639 } 640 641 642 static int wpa_supplicant_gtk_tx_bit_workaround(const struct wpa_sm *sm, 643 int tx) 644 { 645 if (tx && sm->pairwise_cipher != WPA_CIPHER_NONE) { 646 /* Ignore Tx bit for GTK if a pairwise key is used. One AP 647 * seemed to set this bit (incorrectly, since Tx is only when 648 * doing Group Key only APs) and without this workaround, the 649 * data connection does not work because wpa_supplicant 650 * configured non-zero keyidx to be used for unicast. */ 651 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 652 "WPA: Tx bit set for GTK, but pairwise " 653 "keys are used - ignore Tx bit"); 654 return 0; 655 } 656 return tx; 657 } 658 659 660 static int wpa_supplicant_pairwise_gtk(struct wpa_sm *sm, 661 const struct wpa_eapol_key *key, 662 const u8 *gtk, size_t gtk_len, 663 int key_info) 664 { 665 struct wpa_gtk_data gd; 666 667 /* 668 * IEEE Std 802.11i-2004 - 8.5.2 EAPOL-Key frames - Figure 43x 669 * GTK KDE format: 670 * KeyID[bits 0-1], Tx [bit 2], Reserved [bits 3-7] 671 * Reserved [bits 0-7] 672 * GTK 673 */ 674 675 os_memset(&gd, 0, sizeof(gd)); 676 wpa_hexdump_key(MSG_DEBUG, "RSN: received GTK in pairwise handshake", 677 gtk, gtk_len); 678 679 if (gtk_len < 2 || gtk_len - 2 > sizeof(gd.gtk)) 680 return -1; 681 682 gd.keyidx = gtk[0] & 0x3; 683 gd.tx = wpa_supplicant_gtk_tx_bit_workaround(sm, 684 !!(gtk[0] & BIT(2))); 685 gtk += 2; 686 gtk_len -= 2; 687 688 os_memcpy(gd.gtk, gtk, gtk_len); 689 gd.gtk_len = gtk_len; 690 691 if (wpa_supplicant_check_group_cipher(sm, sm->group_cipher, 692 gtk_len, gtk_len, 693 &gd.key_rsc_len, &gd.alg) || 694 wpa_supplicant_install_gtk(sm, &gd, key->key_rsc)) { 695 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 696 "RSN: Failed to install GTK"); 697 return -1; 698 } 699 700 wpa_supplicant_key_neg_complete(sm, sm->bssid, 701 key_info & WPA_KEY_INFO_SECURE); 702 return 0; 703 } 704 705 706 static int ieee80211w_set_keys(struct wpa_sm *sm, 707 struct wpa_eapol_ie_parse *ie) 708 { 709 #ifdef CONFIG_IEEE80211W 710 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC) 711 return 0; 712 713 if (ie->igtk) { 714 const struct wpa_igtk_kde *igtk; 715 u16 keyidx; 716 if (ie->igtk_len != sizeof(*igtk)) 717 return -1; 718 igtk = (const struct wpa_igtk_kde *) ie->igtk; 719 keyidx = WPA_GET_LE16(igtk->keyid); 720 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: IGTK keyid %d " 721 "pn %02x%02x%02x%02x%02x%02x", 722 keyidx, MAC2STR(igtk->pn)); 723 wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK", 724 igtk->igtk, WPA_IGTK_LEN); 725 if (keyidx > 4095) { 726 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 727 "WPA: Invalid IGTK KeyID %d", keyidx); 728 return -1; 729 } 730 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, 731 keyidx, 0, igtk->pn, sizeof(igtk->pn), 732 igtk->igtk, WPA_IGTK_LEN) < 0) { 733 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 734 "WPA: Failed to configure IGTK to the driver"); 735 return -1; 736 } 737 } 738 739 return 0; 740 #else /* CONFIG_IEEE80211W */ 741 return 0; 742 #endif /* CONFIG_IEEE80211W */ 743 } 744 745 746 static void wpa_report_ie_mismatch(struct wpa_sm *sm, 747 const char *reason, const u8 *src_addr, 748 const u8 *wpa_ie, size_t wpa_ie_len, 749 const u8 *rsn_ie, size_t rsn_ie_len) 750 { 751 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "WPA: %s (src=" MACSTR ")", 752 reason, MAC2STR(src_addr)); 753 754 if (sm->ap_wpa_ie) { 755 wpa_hexdump(MSG_INFO, "WPA: WPA IE in Beacon/ProbeResp", 756 sm->ap_wpa_ie, sm->ap_wpa_ie_len); 757 } 758 if (wpa_ie) { 759 if (!sm->ap_wpa_ie) { 760 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 761 "WPA: No WPA IE in Beacon/ProbeResp"); 762 } 763 wpa_hexdump(MSG_INFO, "WPA: WPA IE in 3/4 msg", 764 wpa_ie, wpa_ie_len); 765 } 766 767 if (sm->ap_rsn_ie) { 768 wpa_hexdump(MSG_INFO, "WPA: RSN IE in Beacon/ProbeResp", 769 sm->ap_rsn_ie, sm->ap_rsn_ie_len); 770 } 771 if (rsn_ie) { 772 if (!sm->ap_rsn_ie) { 773 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 774 "WPA: No RSN IE in Beacon/ProbeResp"); 775 } 776 wpa_hexdump(MSG_INFO, "WPA: RSN IE in 3/4 msg", 777 rsn_ie, rsn_ie_len); 778 } 779 780 wpa_sm_deauthenticate(sm, WLAN_REASON_IE_IN_4WAY_DIFFERS); 781 } 782 783 784 #ifdef CONFIG_IEEE80211R 785 786 static int ft_validate_mdie(struct wpa_sm *sm, 787 const unsigned char *src_addr, 788 struct wpa_eapol_ie_parse *ie, 789 const u8 *assoc_resp_mdie) 790 { 791 struct rsn_mdie *mdie; 792 793 mdie = (struct rsn_mdie *) (ie->mdie + 2); 794 if (ie->mdie == NULL || ie->mdie_len < 2 + sizeof(*mdie) || 795 os_memcmp(mdie->mobility_domain, sm->mobility_domain, 796 MOBILITY_DOMAIN_ID_LEN) != 0) { 797 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: MDIE in msg 3/4 did " 798 "not match with the current mobility domain"); 799 return -1; 800 } 801 802 if (assoc_resp_mdie && 803 (assoc_resp_mdie[1] != ie->mdie[1] || 804 os_memcmp(assoc_resp_mdie, ie->mdie, 2 + ie->mdie[1]) != 0)) { 805 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: MDIE mismatch"); 806 wpa_hexdump(MSG_DEBUG, "FT: MDIE in EAPOL-Key msg 3/4", 807 ie->mdie, 2 + ie->mdie[1]); 808 wpa_hexdump(MSG_DEBUG, "FT: MDIE in (Re)Association Response", 809 assoc_resp_mdie, 2 + assoc_resp_mdie[1]); 810 return -1; 811 } 812 813 return 0; 814 } 815 816 817 static int ft_validate_ftie(struct wpa_sm *sm, 818 const unsigned char *src_addr, 819 struct wpa_eapol_ie_parse *ie, 820 const u8 *assoc_resp_ftie) 821 { 822 if (ie->ftie == NULL) { 823 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 824 "FT: No FTIE in EAPOL-Key msg 3/4"); 825 return -1; 826 } 827 828 if (assoc_resp_ftie == NULL) 829 return 0; 830 831 if (assoc_resp_ftie[1] != ie->ftie[1] || 832 os_memcmp(assoc_resp_ftie, ie->ftie, 2 + ie->ftie[1]) != 0) { 833 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: FTIE mismatch"); 834 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 3/4", 835 ie->ftie, 2 + ie->ftie[1]); 836 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)Association Response", 837 assoc_resp_ftie, 2 + assoc_resp_ftie[1]); 838 return -1; 839 } 840 841 return 0; 842 } 843 844 845 static int ft_validate_rsnie(struct wpa_sm *sm, 846 const unsigned char *src_addr, 847 struct wpa_eapol_ie_parse *ie) 848 { 849 struct wpa_ie_data rsn; 850 851 if (!ie->rsn_ie) 852 return 0; 853 854 /* 855 * Verify that PMKR1Name from EAPOL-Key message 3/4 856 * matches with the value we derived. 857 */ 858 if (wpa_parse_wpa_ie_rsn(ie->rsn_ie, ie->rsn_ie_len, &rsn) < 0 || 859 rsn.num_pmkid != 1 || rsn.pmkid == NULL) { 860 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: No PMKR1Name in " 861 "FT 4-way handshake message 3/4"); 862 return -1; 863 } 864 865 if (os_memcmp(rsn.pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0) { 866 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 867 "FT: PMKR1Name mismatch in " 868 "FT 4-way handshake message 3/4"); 869 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Authenticator", 870 rsn.pmkid, WPA_PMK_NAME_LEN); 871 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name", 872 sm->pmk_r1_name, WPA_PMK_NAME_LEN); 873 return -1; 874 } 875 876 return 0; 877 } 878 879 880 static int wpa_supplicant_validate_ie_ft(struct wpa_sm *sm, 881 const unsigned char *src_addr, 882 struct wpa_eapol_ie_parse *ie) 883 { 884 const u8 *pos, *end, *mdie = NULL, *ftie = NULL; 885 886 if (sm->assoc_resp_ies) { 887 pos = sm->assoc_resp_ies; 888 end = pos + sm->assoc_resp_ies_len; 889 while (pos + 2 < end) { 890 if (pos + 2 + pos[1] > end) 891 break; 892 switch (*pos) { 893 case WLAN_EID_MOBILITY_DOMAIN: 894 mdie = pos; 895 break; 896 case WLAN_EID_FAST_BSS_TRANSITION: 897 ftie = pos; 898 break; 899 } 900 pos += 2 + pos[1]; 901 } 902 } 903 904 if (ft_validate_mdie(sm, src_addr, ie, mdie) < 0 || 905 ft_validate_ftie(sm, src_addr, ie, ftie) < 0 || 906 ft_validate_rsnie(sm, src_addr, ie) < 0) 907 return -1; 908 909 return 0; 910 } 911 912 #endif /* CONFIG_IEEE80211R */ 913 914 915 static int wpa_supplicant_validate_ie(struct wpa_sm *sm, 916 const unsigned char *src_addr, 917 struct wpa_eapol_ie_parse *ie) 918 { 919 if (sm->ap_wpa_ie == NULL && sm->ap_rsn_ie == NULL) { 920 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 921 "WPA: No WPA/RSN IE for this AP known. " 922 "Trying to get from scan results"); 923 if (wpa_sm_get_beacon_ie(sm) < 0) { 924 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 925 "WPA: Could not find AP from " 926 "the scan results"); 927 } else { 928 wpa_msg(sm->ctx->msg_ctx, MSG_DEBUG, 929 "WPA: Found the current AP from " 930 "updated scan results"); 931 } 932 } 933 934 if (ie->wpa_ie == NULL && ie->rsn_ie == NULL && 935 (sm->ap_wpa_ie || sm->ap_rsn_ie)) { 936 wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match " 937 "with IE in Beacon/ProbeResp (no IE?)", 938 src_addr, ie->wpa_ie, ie->wpa_ie_len, 939 ie->rsn_ie, ie->rsn_ie_len); 940 return -1; 941 } 942 943 if ((ie->wpa_ie && sm->ap_wpa_ie && 944 (ie->wpa_ie_len != sm->ap_wpa_ie_len || 945 os_memcmp(ie->wpa_ie, sm->ap_wpa_ie, ie->wpa_ie_len) != 0)) || 946 (ie->rsn_ie && sm->ap_rsn_ie && 947 wpa_compare_rsn_ie(wpa_key_mgmt_ft(sm->key_mgmt), 948 sm->ap_rsn_ie, sm->ap_rsn_ie_len, 949 ie->rsn_ie, ie->rsn_ie_len))) { 950 wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match " 951 "with IE in Beacon/ProbeResp", 952 src_addr, ie->wpa_ie, ie->wpa_ie_len, 953 ie->rsn_ie, ie->rsn_ie_len); 954 return -1; 955 } 956 957 if (sm->proto == WPA_PROTO_WPA && 958 ie->rsn_ie && sm->ap_rsn_ie == NULL && sm->rsn_enabled) { 959 wpa_report_ie_mismatch(sm, "Possible downgrade attack " 960 "detected - RSN was enabled and RSN IE " 961 "was in msg 3/4, but not in " 962 "Beacon/ProbeResp", 963 src_addr, ie->wpa_ie, ie->wpa_ie_len, 964 ie->rsn_ie, ie->rsn_ie_len); 965 return -1; 966 } 967 968 #ifdef CONFIG_IEEE80211R 969 if (wpa_key_mgmt_ft(sm->key_mgmt) && 970 wpa_supplicant_validate_ie_ft(sm, src_addr, ie) < 0) 971 return -1; 972 #endif /* CONFIG_IEEE80211R */ 973 974 return 0; 975 } 976 977 978 /** 979 * wpa_supplicant_send_4_of_4 - Send message 4 of WPA/RSN 4-Way Handshake 980 * @sm: Pointer to WPA state machine data from wpa_sm_init() 981 * @dst: Destination address for the frame 982 * @key: Pointer to the EAPOL-Key frame header 983 * @ver: Version bits from EAPOL-Key Key Info 984 * @key_info: Key Info 985 * @kde: KDEs to include the EAPOL-Key frame 986 * @kde_len: Length of KDEs 987 * @ptk: PTK to use for keyed hash and encryption 988 * Returns: 0 on success, -1 on failure 989 */ 990 int wpa_supplicant_send_4_of_4(struct wpa_sm *sm, const unsigned char *dst, 991 const struct wpa_eapol_key *key, 992 u16 ver, u16 key_info, 993 const u8 *kde, size_t kde_len, 994 struct wpa_ptk *ptk) 995 { 996 size_t rlen; 997 struct wpa_eapol_key *reply; 998 u8 *rbuf; 999 1000 if (kde) 1001 wpa_hexdump(MSG_DEBUG, "WPA: KDE for msg 4/4", kde, kde_len); 1002 1003 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL, 1004 sizeof(*reply) + kde_len, 1005 &rlen, (void *) &reply); 1006 if (rbuf == NULL) 1007 return -1; 1008 1009 reply->type = sm->proto == WPA_PROTO_RSN ? 1010 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; 1011 key_info &= WPA_KEY_INFO_SECURE; 1012 key_info |= ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_MIC; 1013 WPA_PUT_BE16(reply->key_info, key_info); 1014 if (sm->proto == WPA_PROTO_RSN) 1015 WPA_PUT_BE16(reply->key_length, 0); 1016 else 1017 os_memcpy(reply->key_length, key->key_length, 2); 1018 os_memcpy(reply->replay_counter, key->replay_counter, 1019 WPA_REPLAY_COUNTER_LEN); 1020 1021 WPA_PUT_BE16(reply->key_data_length, kde_len); 1022 if (kde) 1023 os_memcpy(reply + 1, kde, kde_len); 1024 1025 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 4/4"); 1026 wpa_eapol_key_send(sm, ptk->kck, ver, dst, ETH_P_EAPOL, 1027 rbuf, rlen, reply->key_mic); 1028 1029 return 0; 1030 } 1031 1032 1033 static void wpa_supplicant_process_3_of_4(struct wpa_sm *sm, 1034 const struct wpa_eapol_key *key, 1035 u16 ver) 1036 { 1037 u16 key_info, keylen, len; 1038 const u8 *pos; 1039 struct wpa_eapol_ie_parse ie; 1040 1041 wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE); 1042 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: RX message 3 of 4-Way " 1043 "Handshake from " MACSTR " (ver=%d)", MAC2STR(sm->bssid), ver); 1044 1045 key_info = WPA_GET_BE16(key->key_info); 1046 1047 pos = (const u8 *) (key + 1); 1048 len = WPA_GET_BE16(key->key_data_length); 1049 wpa_hexdump(MSG_DEBUG, "WPA: IE KeyData", pos, len); 1050 if (wpa_supplicant_parse_ies(pos, len, &ie) < 0) 1051 goto failed; 1052 if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) { 1053 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1054 "WPA: GTK IE in unencrypted key data"); 1055 goto failed; 1056 } 1057 #ifdef CONFIG_IEEE80211W 1058 if (ie.igtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) { 1059 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1060 "WPA: IGTK KDE in unencrypted key data"); 1061 goto failed; 1062 } 1063 1064 if (ie.igtk && ie.igtk_len != sizeof(struct wpa_igtk_kde)) { 1065 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1066 "WPA: Invalid IGTK KDE length %lu", 1067 (unsigned long) ie.igtk_len); 1068 goto failed; 1069 } 1070 #endif /* CONFIG_IEEE80211W */ 1071 1072 if (wpa_supplicant_validate_ie(sm, sm->bssid, &ie) < 0) 1073 goto failed; 1074 1075 if (os_memcmp(sm->anonce, key->key_nonce, WPA_NONCE_LEN) != 0) { 1076 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1077 "WPA: ANonce from message 1 of 4-Way Handshake " 1078 "differs from 3 of 4-Way Handshake - drop packet (src=" 1079 MACSTR ")", MAC2STR(sm->bssid)); 1080 goto failed; 1081 } 1082 1083 keylen = WPA_GET_BE16(key->key_length); 1084 if (keylen != wpa_cipher_key_len(sm->pairwise_cipher)) { 1085 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1086 "WPA: Invalid %s key length %d (src=" MACSTR 1087 ")", wpa_cipher_txt(sm->pairwise_cipher), keylen, 1088 MAC2STR(sm->bssid)); 1089 goto failed; 1090 } 1091 1092 if (wpa_supplicant_send_4_of_4(sm, sm->bssid, key, ver, key_info, 1093 NULL, 0, &sm->ptk)) { 1094 goto failed; 1095 } 1096 1097 /* SNonce was successfully used in msg 3/4, so mark it to be renewed 1098 * for the next 4-Way Handshake. If msg 3 is received again, the old 1099 * SNonce will still be used to avoid changing PTK. */ 1100 sm->renew_snonce = 1; 1101 1102 if (key_info & WPA_KEY_INFO_INSTALL) { 1103 if (wpa_supplicant_install_ptk(sm, key)) 1104 goto failed; 1105 } 1106 1107 if (key_info & WPA_KEY_INFO_SECURE) { 1108 wpa_sm_mlme_setprotection( 1109 sm, sm->bssid, MLME_SETPROTECTION_PROTECT_TYPE_RX, 1110 MLME_SETPROTECTION_KEY_TYPE_PAIRWISE); 1111 eapol_sm_notify_portValid(sm->eapol, TRUE); 1112 } 1113 wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE); 1114 1115 if (ie.gtk && 1116 wpa_supplicant_pairwise_gtk(sm, key, 1117 ie.gtk, ie.gtk_len, key_info) < 0) { 1118 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1119 "RSN: Failed to configure GTK"); 1120 goto failed; 1121 } 1122 1123 if (ieee80211w_set_keys(sm, &ie) < 0) { 1124 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1125 "RSN: Failed to configure IGTK"); 1126 goto failed; 1127 } 1128 1129 wpa_sm_set_rekey_offload(sm); 1130 1131 return; 1132 1133 failed: 1134 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED); 1135 } 1136 1137 1138 static int wpa_supplicant_process_1_of_2_rsn(struct wpa_sm *sm, 1139 const u8 *keydata, 1140 size_t keydatalen, 1141 u16 key_info, 1142 struct wpa_gtk_data *gd) 1143 { 1144 int maxkeylen; 1145 struct wpa_eapol_ie_parse ie; 1146 1147 wpa_hexdump(MSG_DEBUG, "RSN: msg 1/2 key data", keydata, keydatalen); 1148 if (wpa_supplicant_parse_ies(keydata, keydatalen, &ie) < 0) 1149 return -1; 1150 if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) { 1151 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1152 "WPA: GTK IE in unencrypted key data"); 1153 return -1; 1154 } 1155 if (ie.gtk == NULL) { 1156 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1157 "WPA: No GTK IE in Group Key msg 1/2"); 1158 return -1; 1159 } 1160 maxkeylen = gd->gtk_len = ie.gtk_len - 2; 1161 1162 if (wpa_supplicant_check_group_cipher(sm, sm->group_cipher, 1163 gd->gtk_len, maxkeylen, 1164 &gd->key_rsc_len, &gd->alg)) 1165 return -1; 1166 1167 wpa_hexdump(MSG_DEBUG, "RSN: received GTK in group key handshake", 1168 ie.gtk, ie.gtk_len); 1169 gd->keyidx = ie.gtk[0] & 0x3; 1170 gd->tx = wpa_supplicant_gtk_tx_bit_workaround(sm, 1171 !!(ie.gtk[0] & BIT(2))); 1172 if (ie.gtk_len - 2 > sizeof(gd->gtk)) { 1173 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1174 "RSN: Too long GTK in GTK IE (len=%lu)", 1175 (unsigned long) ie.gtk_len - 2); 1176 return -1; 1177 } 1178 os_memcpy(gd->gtk, ie.gtk + 2, ie.gtk_len - 2); 1179 1180 if (ieee80211w_set_keys(sm, &ie) < 0) 1181 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1182 "RSN: Failed to configure IGTK"); 1183 1184 return 0; 1185 } 1186 1187 1188 static int wpa_supplicant_process_1_of_2_wpa(struct wpa_sm *sm, 1189 const struct wpa_eapol_key *key, 1190 size_t keydatalen, int key_info, 1191 size_t extra_len, u16 ver, 1192 struct wpa_gtk_data *gd) 1193 { 1194 size_t maxkeylen; 1195 u8 ek[32]; 1196 1197 gd->gtk_len = WPA_GET_BE16(key->key_length); 1198 maxkeylen = keydatalen; 1199 if (keydatalen > extra_len) { 1200 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1201 "WPA: Truncated EAPOL-Key packet: " 1202 "key_data_length=%lu > extra_len=%lu", 1203 (unsigned long) keydatalen, (unsigned long) extra_len); 1204 return -1; 1205 } 1206 if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 1207 if (maxkeylen < 8) { 1208 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1209 "WPA: Too short maxkeylen (%lu)", 1210 (unsigned long) maxkeylen); 1211 return -1; 1212 } 1213 maxkeylen -= 8; 1214 } 1215 1216 if (wpa_supplicant_check_group_cipher(sm, sm->group_cipher, 1217 gd->gtk_len, maxkeylen, 1218 &gd->key_rsc_len, &gd->alg)) 1219 return -1; 1220 1221 gd->keyidx = (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >> 1222 WPA_KEY_INFO_KEY_INDEX_SHIFT; 1223 if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4) { 1224 os_memcpy(ek, key->key_iv, 16); 1225 os_memcpy(ek + 16, sm->ptk.kek, 16); 1226 if (keydatalen > sizeof(gd->gtk)) { 1227 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1228 "WPA: RC4 key data too long (%lu)", 1229 (unsigned long) keydatalen); 1230 return -1; 1231 } 1232 os_memcpy(gd->gtk, key + 1, keydatalen); 1233 if (rc4_skip(ek, 32, 256, gd->gtk, keydatalen)) { 1234 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR, 1235 "WPA: RC4 failed"); 1236 return -1; 1237 } 1238 } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 1239 if (keydatalen % 8) { 1240 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1241 "WPA: Unsupported AES-WRAP len %lu", 1242 (unsigned long) keydatalen); 1243 return -1; 1244 } 1245 if (maxkeylen > sizeof(gd->gtk)) { 1246 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1247 "WPA: AES-WRAP key data " 1248 "too long (keydatalen=%lu maxkeylen=%lu)", 1249 (unsigned long) keydatalen, 1250 (unsigned long) maxkeylen); 1251 return -1; 1252 } 1253 if (aes_unwrap(sm->ptk.kek, maxkeylen / 8, 1254 (const u8 *) (key + 1), gd->gtk)) { 1255 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1256 "WPA: AES unwrap failed - could not decrypt " 1257 "GTK"); 1258 return -1; 1259 } 1260 } else { 1261 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1262 "WPA: Unsupported key_info type %d", ver); 1263 return -1; 1264 } 1265 gd->tx = wpa_supplicant_gtk_tx_bit_workaround( 1266 sm, !!(key_info & WPA_KEY_INFO_TXRX)); 1267 return 0; 1268 } 1269 1270 1271 static int wpa_supplicant_send_2_of_2(struct wpa_sm *sm, 1272 const struct wpa_eapol_key *key, 1273 int ver, u16 key_info) 1274 { 1275 size_t rlen; 1276 struct wpa_eapol_key *reply; 1277 u8 *rbuf; 1278 1279 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL, 1280 sizeof(*reply), &rlen, (void *) &reply); 1281 if (rbuf == NULL) 1282 return -1; 1283 1284 reply->type = sm->proto == WPA_PROTO_RSN ? 1285 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; 1286 key_info &= WPA_KEY_INFO_KEY_INDEX_MASK; 1287 key_info |= ver | WPA_KEY_INFO_MIC | WPA_KEY_INFO_SECURE; 1288 WPA_PUT_BE16(reply->key_info, key_info); 1289 if (sm->proto == WPA_PROTO_RSN) 1290 WPA_PUT_BE16(reply->key_length, 0); 1291 else 1292 os_memcpy(reply->key_length, key->key_length, 2); 1293 os_memcpy(reply->replay_counter, key->replay_counter, 1294 WPA_REPLAY_COUNTER_LEN); 1295 1296 WPA_PUT_BE16(reply->key_data_length, 0); 1297 1298 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 2/2"); 1299 wpa_eapol_key_send(sm, sm->ptk.kck, ver, sm->bssid, ETH_P_EAPOL, 1300 rbuf, rlen, reply->key_mic); 1301 1302 return 0; 1303 } 1304 1305 1306 static void wpa_supplicant_process_1_of_2(struct wpa_sm *sm, 1307 const unsigned char *src_addr, 1308 const struct wpa_eapol_key *key, 1309 int extra_len, u16 ver) 1310 { 1311 u16 key_info, keydatalen; 1312 int rekey, ret; 1313 struct wpa_gtk_data gd; 1314 1315 os_memset(&gd, 0, sizeof(gd)); 1316 1317 rekey = wpa_sm_get_state(sm) == WPA_COMPLETED; 1318 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: RX message 1 of Group Key " 1319 "Handshake from " MACSTR " (ver=%d)", MAC2STR(src_addr), ver); 1320 1321 key_info = WPA_GET_BE16(key->key_info); 1322 keydatalen = WPA_GET_BE16(key->key_data_length); 1323 1324 if (sm->proto == WPA_PROTO_RSN) { 1325 ret = wpa_supplicant_process_1_of_2_rsn(sm, 1326 (const u8 *) (key + 1), 1327 keydatalen, key_info, 1328 &gd); 1329 } else { 1330 ret = wpa_supplicant_process_1_of_2_wpa(sm, key, keydatalen, 1331 key_info, extra_len, 1332 ver, &gd); 1333 } 1334 1335 wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE); 1336 1337 if (ret) 1338 goto failed; 1339 1340 if (wpa_supplicant_install_gtk(sm, &gd, key->key_rsc) || 1341 wpa_supplicant_send_2_of_2(sm, key, ver, key_info)) 1342 goto failed; 1343 1344 if (rekey) { 1345 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, "WPA: Group rekeying " 1346 "completed with " MACSTR " [GTK=%s]", 1347 MAC2STR(sm->bssid), wpa_cipher_txt(sm->group_cipher)); 1348 wpa_sm_cancel_auth_timeout(sm); 1349 wpa_sm_set_state(sm, WPA_COMPLETED); 1350 1351 wpa_sm_set_rekey_offload(sm); 1352 } else { 1353 wpa_supplicant_key_neg_complete(sm, sm->bssid, 1354 key_info & 1355 WPA_KEY_INFO_SECURE); 1356 } 1357 return; 1358 1359 failed: 1360 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED); 1361 } 1362 1363 1364 static int wpa_supplicant_verify_eapol_key_mic(struct wpa_sm *sm, 1365 struct wpa_eapol_key *key, 1366 u16 ver, 1367 const u8 *buf, size_t len) 1368 { 1369 u8 mic[16]; 1370 int ok = 0; 1371 1372 os_memcpy(mic, key->key_mic, 16); 1373 if (sm->tptk_set) { 1374 os_memset(key->key_mic, 0, 16); 1375 wpa_eapol_key_mic(sm->tptk.kck, ver, buf, len, 1376 key->key_mic); 1377 if (os_memcmp(mic, key->key_mic, 16) != 0) { 1378 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1379 "WPA: Invalid EAPOL-Key MIC " 1380 "when using TPTK - ignoring TPTK"); 1381 } else { 1382 ok = 1; 1383 sm->tptk_set = 0; 1384 sm->ptk_set = 1; 1385 os_memcpy(&sm->ptk, &sm->tptk, sizeof(sm->ptk)); 1386 } 1387 } 1388 1389 if (!ok && sm->ptk_set) { 1390 os_memset(key->key_mic, 0, 16); 1391 wpa_eapol_key_mic(sm->ptk.kck, ver, buf, len, 1392 key->key_mic); 1393 if (os_memcmp(mic, key->key_mic, 16) != 0) { 1394 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1395 "WPA: Invalid EAPOL-Key MIC - " 1396 "dropping packet"); 1397 return -1; 1398 } 1399 ok = 1; 1400 } 1401 1402 if (!ok) { 1403 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1404 "WPA: Could not verify EAPOL-Key MIC - " 1405 "dropping packet"); 1406 return -1; 1407 } 1408 1409 os_memcpy(sm->rx_replay_counter, key->replay_counter, 1410 WPA_REPLAY_COUNTER_LEN); 1411 sm->rx_replay_counter_set = 1; 1412 return 0; 1413 } 1414 1415 1416 /* Decrypt RSN EAPOL-Key key data (RC4 or AES-WRAP) */ 1417 static int wpa_supplicant_decrypt_key_data(struct wpa_sm *sm, 1418 struct wpa_eapol_key *key, u16 ver) 1419 { 1420 u16 keydatalen = WPA_GET_BE16(key->key_data_length); 1421 1422 wpa_hexdump(MSG_DEBUG, "RSN: encrypted key data", 1423 (u8 *) (key + 1), keydatalen); 1424 if (!sm->ptk_set) { 1425 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1426 "WPA: PTK not available, cannot decrypt EAPOL-Key Key " 1427 "Data"); 1428 return -1; 1429 } 1430 1431 /* Decrypt key data here so that this operation does not need 1432 * to be implemented separately for each message type. */ 1433 if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4) { 1434 u8 ek[32]; 1435 os_memcpy(ek, key->key_iv, 16); 1436 os_memcpy(ek + 16, sm->ptk.kek, 16); 1437 if (rc4_skip(ek, 32, 256, (u8 *) (key + 1), keydatalen)) { 1438 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR, 1439 "WPA: RC4 failed"); 1440 return -1; 1441 } 1442 } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES || 1443 ver == WPA_KEY_INFO_TYPE_AES_128_CMAC) { 1444 u8 *buf; 1445 if (keydatalen % 8) { 1446 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1447 "WPA: Unsupported AES-WRAP len %d", 1448 keydatalen); 1449 return -1; 1450 } 1451 keydatalen -= 8; /* AES-WRAP adds 8 bytes */ 1452 buf = os_malloc(keydatalen); 1453 if (buf == NULL) { 1454 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1455 "WPA: No memory for AES-UNWRAP buffer"); 1456 return -1; 1457 } 1458 if (aes_unwrap(sm->ptk.kek, keydatalen / 8, 1459 (u8 *) (key + 1), buf)) { 1460 os_free(buf); 1461 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1462 "WPA: AES unwrap failed - " 1463 "could not decrypt EAPOL-Key key data"); 1464 return -1; 1465 } 1466 os_memcpy(key + 1, buf, keydatalen); 1467 os_free(buf); 1468 WPA_PUT_BE16(key->key_data_length, keydatalen); 1469 } else { 1470 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1471 "WPA: Unsupported key_info type %d", ver); 1472 return -1; 1473 } 1474 wpa_hexdump_key(MSG_DEBUG, "WPA: decrypted EAPOL-Key key data", 1475 (u8 *) (key + 1), keydatalen); 1476 return 0; 1477 } 1478 1479 1480 /** 1481 * wpa_sm_aborted_cached - Notify WPA that PMKSA caching was aborted 1482 * @sm: Pointer to WPA state machine data from wpa_sm_init() 1483 */ 1484 void wpa_sm_aborted_cached(struct wpa_sm *sm) 1485 { 1486 if (sm && sm->cur_pmksa) { 1487 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1488 "RSN: Cancelling PMKSA caching attempt"); 1489 sm->cur_pmksa = NULL; 1490 } 1491 } 1492 1493 1494 static void wpa_eapol_key_dump(struct wpa_sm *sm, 1495 const struct wpa_eapol_key *key) 1496 { 1497 #ifndef CONFIG_NO_STDOUT_DEBUG 1498 u16 key_info = WPA_GET_BE16(key->key_info); 1499 1500 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, " EAPOL-Key type=%d", key->type); 1501 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1502 " key_info 0x%x (ver=%d keyidx=%d rsvd=%d %s%s%s%s%s%s%s%s)", 1503 key_info, key_info & WPA_KEY_INFO_TYPE_MASK, 1504 (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >> 1505 WPA_KEY_INFO_KEY_INDEX_SHIFT, 1506 (key_info & (BIT(13) | BIT(14) | BIT(15))) >> 13, 1507 key_info & WPA_KEY_INFO_KEY_TYPE ? "Pairwise" : "Group", 1508 key_info & WPA_KEY_INFO_INSTALL ? " Install" : "", 1509 key_info & WPA_KEY_INFO_ACK ? " Ack" : "", 1510 key_info & WPA_KEY_INFO_MIC ? " MIC" : "", 1511 key_info & WPA_KEY_INFO_SECURE ? " Secure" : "", 1512 key_info & WPA_KEY_INFO_ERROR ? " Error" : "", 1513 key_info & WPA_KEY_INFO_REQUEST ? " Request" : "", 1514 key_info & WPA_KEY_INFO_ENCR_KEY_DATA ? " Encr" : ""); 1515 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1516 " key_length=%u key_data_length=%u", 1517 WPA_GET_BE16(key->key_length), 1518 WPA_GET_BE16(key->key_data_length)); 1519 wpa_hexdump(MSG_DEBUG, " replay_counter", 1520 key->replay_counter, WPA_REPLAY_COUNTER_LEN); 1521 wpa_hexdump(MSG_DEBUG, " key_nonce", key->key_nonce, WPA_NONCE_LEN); 1522 wpa_hexdump(MSG_DEBUG, " key_iv", key->key_iv, 16); 1523 wpa_hexdump(MSG_DEBUG, " key_rsc", key->key_rsc, 8); 1524 wpa_hexdump(MSG_DEBUG, " key_id (reserved)", key->key_id, 8); 1525 wpa_hexdump(MSG_DEBUG, " key_mic", key->key_mic, 16); 1526 #endif /* CONFIG_NO_STDOUT_DEBUG */ 1527 } 1528 1529 1530 /** 1531 * wpa_sm_rx_eapol - Process received WPA EAPOL frames 1532 * @sm: Pointer to WPA state machine data from wpa_sm_init() 1533 * @src_addr: Source MAC address of the EAPOL packet 1534 * @buf: Pointer to the beginning of the EAPOL data (EAPOL header) 1535 * @len: Length of the EAPOL frame 1536 * Returns: 1 = WPA EAPOL-Key processed, 0 = not a WPA EAPOL-Key, -1 failure 1537 * 1538 * This function is called for each received EAPOL frame. Other than EAPOL-Key 1539 * frames can be skipped if filtering is done elsewhere. wpa_sm_rx_eapol() is 1540 * only processing WPA and WPA2 EAPOL-Key frames. 1541 * 1542 * The received EAPOL-Key packets are validated and valid packets are replied 1543 * to. In addition, key material (PTK, GTK) is configured at the end of a 1544 * successful key handshake. 1545 */ 1546 int wpa_sm_rx_eapol(struct wpa_sm *sm, const u8 *src_addr, 1547 const u8 *buf, size_t len) 1548 { 1549 size_t plen, data_len, extra_len; 1550 struct ieee802_1x_hdr *hdr; 1551 struct wpa_eapol_key *key; 1552 u16 key_info, ver; 1553 u8 *tmp; 1554 int ret = -1; 1555 struct wpa_peerkey *peerkey = NULL; 1556 1557 #ifdef CONFIG_IEEE80211R 1558 sm->ft_completed = 0; 1559 #endif /* CONFIG_IEEE80211R */ 1560 1561 if (len < sizeof(*hdr) + sizeof(*key)) { 1562 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1563 "WPA: EAPOL frame too short to be a WPA " 1564 "EAPOL-Key (len %lu, expecting at least %lu)", 1565 (unsigned long) len, 1566 (unsigned long) sizeof(*hdr) + sizeof(*key)); 1567 return 0; 1568 } 1569 1570 tmp = os_malloc(len); 1571 if (tmp == NULL) 1572 return -1; 1573 os_memcpy(tmp, buf, len); 1574 1575 hdr = (struct ieee802_1x_hdr *) tmp; 1576 key = (struct wpa_eapol_key *) (hdr + 1); 1577 plen = be_to_host16(hdr->length); 1578 data_len = plen + sizeof(*hdr); 1579 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1580 "IEEE 802.1X RX: version=%d type=%d length=%lu", 1581 hdr->version, hdr->type, (unsigned long) plen); 1582 1583 if (hdr->version < EAPOL_VERSION) { 1584 /* TODO: backwards compatibility */ 1585 } 1586 if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) { 1587 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1588 "WPA: EAPOL frame (type %u) discarded, " 1589 "not a Key frame", hdr->type); 1590 ret = 0; 1591 goto out; 1592 } 1593 if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) { 1594 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1595 "WPA: EAPOL frame payload size %lu " 1596 "invalid (frame size %lu)", 1597 (unsigned long) plen, (unsigned long) len); 1598 ret = 0; 1599 goto out; 1600 } 1601 1602 if (key->type != EAPOL_KEY_TYPE_WPA && key->type != EAPOL_KEY_TYPE_RSN) 1603 { 1604 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1605 "WPA: EAPOL-Key type (%d) unknown, discarded", 1606 key->type); 1607 ret = 0; 1608 goto out; 1609 } 1610 wpa_eapol_key_dump(sm, key); 1611 1612 eapol_sm_notify_lower_layer_success(sm->eapol, 0); 1613 wpa_hexdump(MSG_MSGDUMP, "WPA: RX EAPOL-Key", tmp, len); 1614 if (data_len < len) { 1615 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1616 "WPA: ignoring %lu bytes after the IEEE 802.1X data", 1617 (unsigned long) len - data_len); 1618 } 1619 key_info = WPA_GET_BE16(key->key_info); 1620 ver = key_info & WPA_KEY_INFO_TYPE_MASK; 1621 if (ver != WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 && 1622 #if defined(CONFIG_IEEE80211R) || defined(CONFIG_IEEE80211W) 1623 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC && 1624 #endif /* CONFIG_IEEE80211R || CONFIG_IEEE80211W */ 1625 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 1626 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1627 "WPA: Unsupported EAPOL-Key descriptor version %d", 1628 ver); 1629 goto out; 1630 } 1631 1632 #ifdef CONFIG_IEEE80211R 1633 if (wpa_key_mgmt_ft(sm->key_mgmt)) { 1634 /* IEEE 802.11r uses a new key_info type (AES-128-CMAC). */ 1635 if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) { 1636 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1637 "FT: AP did not use AES-128-CMAC"); 1638 goto out; 1639 } 1640 } else 1641 #endif /* CONFIG_IEEE80211R */ 1642 #ifdef CONFIG_IEEE80211W 1643 if (wpa_key_mgmt_sha256(sm->key_mgmt)) { 1644 if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) { 1645 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1646 "WPA: AP did not use the " 1647 "negotiated AES-128-CMAC"); 1648 goto out; 1649 } 1650 } else 1651 #endif /* CONFIG_IEEE80211W */ 1652 if (sm->pairwise_cipher == WPA_CIPHER_CCMP && 1653 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 1654 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1655 "WPA: CCMP is used, but EAPOL-Key " 1656 "descriptor version (%d) is not 2", ver); 1657 if (sm->group_cipher != WPA_CIPHER_CCMP && 1658 !(key_info & WPA_KEY_INFO_KEY_TYPE)) { 1659 /* Earlier versions of IEEE 802.11i did not explicitly 1660 * require version 2 descriptor for all EAPOL-Key 1661 * packets, so allow group keys to use version 1 if 1662 * CCMP is not used for them. */ 1663 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1664 "WPA: Backwards compatibility: allow invalid " 1665 "version for non-CCMP group keys"); 1666 } else 1667 goto out; 1668 } 1669 if (sm->pairwise_cipher == WPA_CIPHER_GCMP && 1670 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 1671 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1672 "WPA: GCMP is used, but EAPOL-Key " 1673 "descriptor version (%d) is not 2", ver); 1674 goto out; 1675 } 1676 1677 #ifdef CONFIG_PEERKEY 1678 for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) { 1679 if (os_memcmp(peerkey->addr, src_addr, ETH_ALEN) == 0) 1680 break; 1681 } 1682 1683 if (!(key_info & WPA_KEY_INFO_SMK_MESSAGE) && peerkey) { 1684 if (!peerkey->initiator && peerkey->replay_counter_set && 1685 os_memcmp(key->replay_counter, peerkey->replay_counter, 1686 WPA_REPLAY_COUNTER_LEN) <= 0) { 1687 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1688 "RSN: EAPOL-Key Replay Counter did not " 1689 "increase (STK) - dropping packet"); 1690 goto out; 1691 } else if (peerkey->initiator) { 1692 u8 _tmp[WPA_REPLAY_COUNTER_LEN]; 1693 os_memcpy(_tmp, key->replay_counter, 1694 WPA_REPLAY_COUNTER_LEN); 1695 inc_byte_array(_tmp, WPA_REPLAY_COUNTER_LEN); 1696 if (os_memcmp(_tmp, peerkey->replay_counter, 1697 WPA_REPLAY_COUNTER_LEN) != 0) { 1698 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1699 "RSN: EAPOL-Key Replay " 1700 "Counter did not match (STK) - " 1701 "dropping packet"); 1702 goto out; 1703 } 1704 } 1705 } 1706 1707 if (peerkey && peerkey->initiator && (key_info & WPA_KEY_INFO_ACK)) { 1708 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1709 "RSN: Ack bit in key_info from STK peer"); 1710 goto out; 1711 } 1712 #endif /* CONFIG_PEERKEY */ 1713 1714 if (!peerkey && sm->rx_replay_counter_set && 1715 os_memcmp(key->replay_counter, sm->rx_replay_counter, 1716 WPA_REPLAY_COUNTER_LEN) <= 0) { 1717 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1718 "WPA: EAPOL-Key Replay Counter did not increase - " 1719 "dropping packet"); 1720 goto out; 1721 } 1722 1723 if (!(key_info & (WPA_KEY_INFO_ACK | WPA_KEY_INFO_SMK_MESSAGE)) 1724 #ifdef CONFIG_PEERKEY 1725 && (peerkey == NULL || !peerkey->initiator) 1726 #endif /* CONFIG_PEERKEY */ 1727 ) { 1728 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1729 "WPA: No Ack bit in key_info"); 1730 goto out; 1731 } 1732 1733 if (key_info & WPA_KEY_INFO_REQUEST) { 1734 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1735 "WPA: EAPOL-Key with Request bit - dropped"); 1736 goto out; 1737 } 1738 1739 if ((key_info & WPA_KEY_INFO_MIC) && !peerkey && 1740 wpa_supplicant_verify_eapol_key_mic(sm, key, ver, tmp, data_len)) 1741 goto out; 1742 1743 #ifdef CONFIG_PEERKEY 1744 if ((key_info & WPA_KEY_INFO_MIC) && peerkey && 1745 peerkey_verify_eapol_key_mic(sm, peerkey, key, ver, tmp, data_len)) 1746 goto out; 1747 #endif /* CONFIG_PEERKEY */ 1748 1749 extra_len = data_len - sizeof(*hdr) - sizeof(*key); 1750 1751 if (WPA_GET_BE16(key->key_data_length) > extra_len) { 1752 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, "WPA: Invalid EAPOL-Key " 1753 "frame - key_data overflow (%d > %lu)", 1754 WPA_GET_BE16(key->key_data_length), 1755 (unsigned long) extra_len); 1756 goto out; 1757 } 1758 extra_len = WPA_GET_BE16(key->key_data_length); 1759 1760 if (sm->proto == WPA_PROTO_RSN && 1761 (key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) { 1762 if (wpa_supplicant_decrypt_key_data(sm, key, ver)) 1763 goto out; 1764 extra_len = WPA_GET_BE16(key->key_data_length); 1765 } 1766 1767 if (key_info & WPA_KEY_INFO_KEY_TYPE) { 1768 if (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) { 1769 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1770 "WPA: Ignored EAPOL-Key (Pairwise) with " 1771 "non-zero key index"); 1772 goto out; 1773 } 1774 if (peerkey) { 1775 /* PeerKey 4-Way Handshake */ 1776 peerkey_rx_eapol_4way(sm, peerkey, key, key_info, ver); 1777 } else if (key_info & WPA_KEY_INFO_MIC) { 1778 /* 3/4 4-Way Handshake */ 1779 wpa_supplicant_process_3_of_4(sm, key, ver); 1780 } else { 1781 /* 1/4 4-Way Handshake */ 1782 wpa_supplicant_process_1_of_4(sm, src_addr, key, 1783 ver); 1784 } 1785 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) { 1786 /* PeerKey SMK Handshake */ 1787 peerkey_rx_eapol_smk(sm, src_addr, key, extra_len, key_info, 1788 ver); 1789 } else { 1790 if (key_info & WPA_KEY_INFO_MIC) { 1791 /* 1/2 Group Key Handshake */ 1792 wpa_supplicant_process_1_of_2(sm, src_addr, key, 1793 extra_len, ver); 1794 } else { 1795 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1796 "WPA: EAPOL-Key (Group) without Mic bit - " 1797 "dropped"); 1798 } 1799 } 1800 1801 ret = 1; 1802 1803 out: 1804 os_free(tmp); 1805 return ret; 1806 } 1807 1808 1809 #ifdef CONFIG_CTRL_IFACE 1810 static u32 wpa_key_mgmt_suite(struct wpa_sm *sm) 1811 { 1812 switch (sm->key_mgmt) { 1813 case WPA_KEY_MGMT_IEEE8021X: 1814 return (sm->proto == WPA_PROTO_RSN ? 1815 RSN_AUTH_KEY_MGMT_UNSPEC_802_1X : 1816 WPA_AUTH_KEY_MGMT_UNSPEC_802_1X); 1817 case WPA_KEY_MGMT_PSK: 1818 return (sm->proto == WPA_PROTO_RSN ? 1819 RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X : 1820 WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X); 1821 #ifdef CONFIG_IEEE80211R 1822 case WPA_KEY_MGMT_FT_IEEE8021X: 1823 return RSN_AUTH_KEY_MGMT_FT_802_1X; 1824 case WPA_KEY_MGMT_FT_PSK: 1825 return RSN_AUTH_KEY_MGMT_FT_PSK; 1826 #endif /* CONFIG_IEEE80211R */ 1827 #ifdef CONFIG_IEEE80211W 1828 case WPA_KEY_MGMT_IEEE8021X_SHA256: 1829 return RSN_AUTH_KEY_MGMT_802_1X_SHA256; 1830 case WPA_KEY_MGMT_PSK_SHA256: 1831 return RSN_AUTH_KEY_MGMT_PSK_SHA256; 1832 #endif /* CONFIG_IEEE80211W */ 1833 case WPA_KEY_MGMT_CCKM: 1834 return (sm->proto == WPA_PROTO_RSN ? 1835 RSN_AUTH_KEY_MGMT_CCKM: 1836 WPA_AUTH_KEY_MGMT_CCKM); 1837 case WPA_KEY_MGMT_WPA_NONE: 1838 return WPA_AUTH_KEY_MGMT_NONE; 1839 default: 1840 return 0; 1841 } 1842 } 1843 1844 1845 #define RSN_SUITE "%02x-%02x-%02x-%d" 1846 #define RSN_SUITE_ARG(s) \ 1847 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff 1848 1849 /** 1850 * wpa_sm_get_mib - Dump text list of MIB entries 1851 * @sm: Pointer to WPA state machine data from wpa_sm_init() 1852 * @buf: Buffer for the list 1853 * @buflen: Length of the buffer 1854 * Returns: Number of bytes written to buffer 1855 * 1856 * This function is used fetch dot11 MIB variables. 1857 */ 1858 int wpa_sm_get_mib(struct wpa_sm *sm, char *buf, size_t buflen) 1859 { 1860 char pmkid_txt[PMKID_LEN * 2 + 1]; 1861 int rsna, ret; 1862 size_t len; 1863 1864 if (sm->cur_pmksa) { 1865 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt), 1866 sm->cur_pmksa->pmkid, PMKID_LEN); 1867 } else 1868 pmkid_txt[0] = '\0'; 1869 1870 if ((wpa_key_mgmt_wpa_psk(sm->key_mgmt) || 1871 wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt)) && 1872 sm->proto == WPA_PROTO_RSN) 1873 rsna = 1; 1874 else 1875 rsna = 0; 1876 1877 ret = os_snprintf(buf, buflen, 1878 "dot11RSNAOptionImplemented=TRUE\n" 1879 "dot11RSNAPreauthenticationImplemented=TRUE\n" 1880 "dot11RSNAEnabled=%s\n" 1881 "dot11RSNAPreauthenticationEnabled=%s\n" 1882 "dot11RSNAConfigVersion=%d\n" 1883 "dot11RSNAConfigPairwiseKeysSupported=5\n" 1884 "dot11RSNAConfigGroupCipherSize=%d\n" 1885 "dot11RSNAConfigPMKLifetime=%d\n" 1886 "dot11RSNAConfigPMKReauthThreshold=%d\n" 1887 "dot11RSNAConfigNumberOfPTKSAReplayCounters=1\n" 1888 "dot11RSNAConfigSATimeout=%d\n", 1889 rsna ? "TRUE" : "FALSE", 1890 rsna ? "TRUE" : "FALSE", 1891 RSN_VERSION, 1892 wpa_cipher_key_len(sm->group_cipher) * 8, 1893 sm->dot11RSNAConfigPMKLifetime, 1894 sm->dot11RSNAConfigPMKReauthThreshold, 1895 sm->dot11RSNAConfigSATimeout); 1896 if (ret < 0 || (size_t) ret >= buflen) 1897 return 0; 1898 len = ret; 1899 1900 ret = os_snprintf( 1901 buf + len, buflen - len, 1902 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n" 1903 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n" 1904 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n" 1905 "dot11RSNAPMKIDUsed=%s\n" 1906 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n" 1907 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n" 1908 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n" 1909 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n" 1910 "dot11RSNA4WayHandshakeFailures=%u\n", 1911 RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)), 1912 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto, 1913 sm->pairwise_cipher)), 1914 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto, 1915 sm->group_cipher)), 1916 pmkid_txt, 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 sm->dot11RSNA4WayHandshakeFailures); 1923 if (ret >= 0 && (size_t) ret < buflen) 1924 len += ret; 1925 1926 return (int) len; 1927 } 1928 #endif /* CONFIG_CTRL_IFACE */ 1929 1930 1931 static void wpa_sm_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry, 1932 void *ctx, enum pmksa_free_reason reason) 1933 { 1934 struct wpa_sm *sm = ctx; 1935 int deauth = 0; 1936 1937 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "RSN: PMKSA cache entry free_cb: " 1938 MACSTR " reason=%d", MAC2STR(entry->aa), reason); 1939 1940 if (sm->cur_pmksa == entry) { 1941 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1942 "RSN: %s current PMKSA entry", 1943 reason == PMKSA_REPLACE ? "replaced" : "removed"); 1944 pmksa_cache_clear_current(sm); 1945 1946 /* 1947 * If an entry is simply being replaced, there's no need to 1948 * deauthenticate because it will be immediately re-added. 1949 * This happens when EAP authentication is completed again 1950 * (reauth or failed PMKSA caching attempt). 1951 */ 1952 if (reason != PMKSA_REPLACE) 1953 deauth = 1; 1954 } 1955 1956 if (reason == PMKSA_EXPIRE && 1957 (sm->pmk_len == entry->pmk_len && 1958 os_memcmp(sm->pmk, entry->pmk, sm->pmk_len) == 0)) { 1959 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1960 "RSN: deauthenticating due to expired PMK"); 1961 pmksa_cache_clear_current(sm); 1962 deauth = 1; 1963 } 1964 1965 if (deauth) { 1966 os_memset(sm->pmk, 0, sizeof(sm->pmk)); 1967 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED); 1968 } 1969 } 1970 1971 1972 /** 1973 * wpa_sm_init - Initialize WPA state machine 1974 * @ctx: Context pointer for callbacks; this needs to be an allocated buffer 1975 * Returns: Pointer to the allocated WPA state machine data 1976 * 1977 * This function is used to allocate a new WPA state machine and the returned 1978 * value is passed to all WPA state machine calls. 1979 */ 1980 struct wpa_sm * wpa_sm_init(struct wpa_sm_ctx *ctx) 1981 { 1982 struct wpa_sm *sm; 1983 1984 sm = os_zalloc(sizeof(*sm)); 1985 if (sm == NULL) 1986 return NULL; 1987 dl_list_init(&sm->pmksa_candidates); 1988 sm->renew_snonce = 1; 1989 sm->ctx = ctx; 1990 1991 sm->dot11RSNAConfigPMKLifetime = 43200; 1992 sm->dot11RSNAConfigPMKReauthThreshold = 70; 1993 sm->dot11RSNAConfigSATimeout = 60; 1994 1995 sm->pmksa = pmksa_cache_init(wpa_sm_pmksa_free_cb, sm, sm); 1996 if (sm->pmksa == NULL) { 1997 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR, 1998 "RSN: PMKSA cache initialization failed"); 1999 os_free(sm); 2000 return NULL; 2001 } 2002 2003 return sm; 2004 } 2005 2006 2007 /** 2008 * wpa_sm_deinit - Deinitialize WPA state machine 2009 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2010 */ 2011 void wpa_sm_deinit(struct wpa_sm *sm) 2012 { 2013 if (sm == NULL) 2014 return; 2015 pmksa_cache_deinit(sm->pmksa); 2016 eloop_cancel_timeout(wpa_sm_start_preauth, sm, NULL); 2017 eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL); 2018 os_free(sm->assoc_wpa_ie); 2019 os_free(sm->ap_wpa_ie); 2020 os_free(sm->ap_rsn_ie); 2021 os_free(sm->ctx); 2022 peerkey_deinit(sm); 2023 #ifdef CONFIG_IEEE80211R 2024 os_free(sm->assoc_resp_ies); 2025 #endif /* CONFIG_IEEE80211R */ 2026 os_free(sm); 2027 } 2028 2029 2030 /** 2031 * wpa_sm_notify_assoc - Notify WPA state machine about association 2032 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2033 * @bssid: The BSSID of the new association 2034 * 2035 * This function is called to let WPA state machine know that the connection 2036 * was established. 2037 */ 2038 void wpa_sm_notify_assoc(struct wpa_sm *sm, const u8 *bssid) 2039 { 2040 int clear_ptk = 1; 2041 2042 if (sm == NULL) 2043 return; 2044 2045 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 2046 "WPA: Association event - clear replay counter"); 2047 os_memcpy(sm->bssid, bssid, ETH_ALEN); 2048 os_memset(sm->rx_replay_counter, 0, WPA_REPLAY_COUNTER_LEN); 2049 sm->rx_replay_counter_set = 0; 2050 sm->renew_snonce = 1; 2051 if (os_memcmp(sm->preauth_bssid, bssid, ETH_ALEN) == 0) 2052 rsn_preauth_deinit(sm); 2053 2054 #ifdef CONFIG_IEEE80211R 2055 if (wpa_ft_is_completed(sm)) { 2056 /* 2057 * Clear portValid to kick EAPOL state machine to re-enter 2058 * AUTHENTICATED state to get the EAPOL port Authorized. 2059 */ 2060 eapol_sm_notify_portValid(sm->eapol, FALSE); 2061 wpa_supplicant_key_neg_complete(sm, sm->bssid, 1); 2062 2063 /* Prepare for the next transition */ 2064 wpa_ft_prepare_auth_request(sm, NULL); 2065 2066 clear_ptk = 0; 2067 } 2068 #endif /* CONFIG_IEEE80211R */ 2069 2070 if (clear_ptk) { 2071 /* 2072 * IEEE 802.11, 8.4.10: Delete PTK SA on (re)association if 2073 * this is not part of a Fast BSS Transition. 2074 */ 2075 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Clear old PTK"); 2076 sm->ptk_set = 0; 2077 sm->tptk_set = 0; 2078 } 2079 2080 #ifdef CONFIG_TDLS 2081 wpa_tdls_assoc(sm); 2082 #endif /* CONFIG_TDLS */ 2083 } 2084 2085 2086 /** 2087 * wpa_sm_notify_disassoc - Notify WPA state machine about disassociation 2088 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2089 * 2090 * This function is called to let WPA state machine know that the connection 2091 * was lost. This will abort any existing pre-authentication session. 2092 */ 2093 void wpa_sm_notify_disassoc(struct wpa_sm *sm) 2094 { 2095 rsn_preauth_deinit(sm); 2096 pmksa_cache_clear_current(sm); 2097 if (wpa_sm_get_state(sm) == WPA_4WAY_HANDSHAKE) 2098 sm->dot11RSNA4WayHandshakeFailures++; 2099 #ifdef CONFIG_TDLS 2100 wpa_tdls_disassoc(sm); 2101 #endif /* CONFIG_TDLS */ 2102 } 2103 2104 2105 /** 2106 * wpa_sm_set_pmk - Set PMK 2107 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2108 * @pmk: The new PMK 2109 * @pmk_len: The length of the new PMK in bytes 2110 * 2111 * Configure the PMK for WPA state machine. 2112 */ 2113 void wpa_sm_set_pmk(struct wpa_sm *sm, const u8 *pmk, size_t pmk_len) 2114 { 2115 if (sm == NULL) 2116 return; 2117 2118 sm->pmk_len = pmk_len; 2119 os_memcpy(sm->pmk, pmk, pmk_len); 2120 2121 #ifdef CONFIG_IEEE80211R 2122 /* Set XXKey to be PSK for FT key derivation */ 2123 sm->xxkey_len = pmk_len; 2124 os_memcpy(sm->xxkey, pmk, pmk_len); 2125 #endif /* CONFIG_IEEE80211R */ 2126 } 2127 2128 2129 /** 2130 * wpa_sm_set_pmk_from_pmksa - Set PMK based on the current PMKSA 2131 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2132 * 2133 * Take the PMK from the current PMKSA into use. If no PMKSA is active, the PMK 2134 * will be cleared. 2135 */ 2136 void wpa_sm_set_pmk_from_pmksa(struct wpa_sm *sm) 2137 { 2138 if (sm == NULL) 2139 return; 2140 2141 if (sm->cur_pmksa) { 2142 sm->pmk_len = sm->cur_pmksa->pmk_len; 2143 os_memcpy(sm->pmk, sm->cur_pmksa->pmk, sm->pmk_len); 2144 } else { 2145 sm->pmk_len = PMK_LEN; 2146 os_memset(sm->pmk, 0, PMK_LEN); 2147 } 2148 } 2149 2150 2151 /** 2152 * wpa_sm_set_fast_reauth - Set fast reauthentication (EAP) enabled/disabled 2153 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2154 * @fast_reauth: Whether fast reauthentication (EAP) is allowed 2155 */ 2156 void wpa_sm_set_fast_reauth(struct wpa_sm *sm, int fast_reauth) 2157 { 2158 if (sm) 2159 sm->fast_reauth = fast_reauth; 2160 } 2161 2162 2163 /** 2164 * wpa_sm_set_scard_ctx - Set context pointer for smartcard callbacks 2165 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2166 * @scard_ctx: Context pointer for smartcard related callback functions 2167 */ 2168 void wpa_sm_set_scard_ctx(struct wpa_sm *sm, void *scard_ctx) 2169 { 2170 if (sm == NULL) 2171 return; 2172 sm->scard_ctx = scard_ctx; 2173 if (sm->preauth_eapol) 2174 eapol_sm_register_scard_ctx(sm->preauth_eapol, scard_ctx); 2175 } 2176 2177 2178 /** 2179 * wpa_sm_set_config - Notification of current configration change 2180 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2181 * @config: Pointer to current network configuration 2182 * 2183 * Notify WPA state machine that configuration has changed. config will be 2184 * stored as a backpointer to network configuration. This can be %NULL to clear 2185 * the stored pointed. 2186 */ 2187 void wpa_sm_set_config(struct wpa_sm *sm, struct rsn_supp_config *config) 2188 { 2189 if (!sm) 2190 return; 2191 2192 if (config) { 2193 sm->network_ctx = config->network_ctx; 2194 sm->peerkey_enabled = config->peerkey_enabled; 2195 sm->allowed_pairwise_cipher = config->allowed_pairwise_cipher; 2196 sm->proactive_key_caching = config->proactive_key_caching; 2197 sm->eap_workaround = config->eap_workaround; 2198 sm->eap_conf_ctx = config->eap_conf_ctx; 2199 if (config->ssid) { 2200 os_memcpy(sm->ssid, config->ssid, config->ssid_len); 2201 sm->ssid_len = config->ssid_len; 2202 } else 2203 sm->ssid_len = 0; 2204 sm->wpa_ptk_rekey = config->wpa_ptk_rekey; 2205 } else { 2206 sm->network_ctx = NULL; 2207 sm->peerkey_enabled = 0; 2208 sm->allowed_pairwise_cipher = 0; 2209 sm->proactive_key_caching = 0; 2210 sm->eap_workaround = 0; 2211 sm->eap_conf_ctx = NULL; 2212 sm->ssid_len = 0; 2213 sm->wpa_ptk_rekey = 0; 2214 } 2215 } 2216 2217 2218 /** 2219 * wpa_sm_set_own_addr - Set own MAC address 2220 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2221 * @addr: Own MAC address 2222 */ 2223 void wpa_sm_set_own_addr(struct wpa_sm *sm, const u8 *addr) 2224 { 2225 if (sm) 2226 os_memcpy(sm->own_addr, addr, ETH_ALEN); 2227 } 2228 2229 2230 /** 2231 * wpa_sm_set_ifname - Set network interface name 2232 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2233 * @ifname: Interface name 2234 * @bridge_ifname: Optional bridge interface name (for pre-auth) 2235 */ 2236 void wpa_sm_set_ifname(struct wpa_sm *sm, const char *ifname, 2237 const char *bridge_ifname) 2238 { 2239 if (sm) { 2240 sm->ifname = ifname; 2241 sm->bridge_ifname = bridge_ifname; 2242 } 2243 } 2244 2245 2246 /** 2247 * wpa_sm_set_eapol - Set EAPOL state machine pointer 2248 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2249 * @eapol: Pointer to EAPOL state machine allocated with eapol_sm_init() 2250 */ 2251 void wpa_sm_set_eapol(struct wpa_sm *sm, struct eapol_sm *eapol) 2252 { 2253 if (sm) 2254 sm->eapol = eapol; 2255 } 2256 2257 2258 /** 2259 * wpa_sm_set_param - Set WPA state machine parameters 2260 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2261 * @param: Parameter field 2262 * @value: Parameter value 2263 * Returns: 0 on success, -1 on failure 2264 */ 2265 int wpa_sm_set_param(struct wpa_sm *sm, enum wpa_sm_conf_params param, 2266 unsigned int value) 2267 { 2268 int ret = 0; 2269 2270 if (sm == NULL) 2271 return -1; 2272 2273 switch (param) { 2274 case RSNA_PMK_LIFETIME: 2275 if (value > 0) 2276 sm->dot11RSNAConfigPMKLifetime = value; 2277 else 2278 ret = -1; 2279 break; 2280 case RSNA_PMK_REAUTH_THRESHOLD: 2281 if (value > 0 && value <= 100) 2282 sm->dot11RSNAConfigPMKReauthThreshold = value; 2283 else 2284 ret = -1; 2285 break; 2286 case RSNA_SA_TIMEOUT: 2287 if (value > 0) 2288 sm->dot11RSNAConfigSATimeout = value; 2289 else 2290 ret = -1; 2291 break; 2292 case WPA_PARAM_PROTO: 2293 sm->proto = value; 2294 break; 2295 case WPA_PARAM_PAIRWISE: 2296 sm->pairwise_cipher = value; 2297 break; 2298 case WPA_PARAM_GROUP: 2299 sm->group_cipher = value; 2300 break; 2301 case WPA_PARAM_KEY_MGMT: 2302 sm->key_mgmt = value; 2303 break; 2304 #ifdef CONFIG_IEEE80211W 2305 case WPA_PARAM_MGMT_GROUP: 2306 sm->mgmt_group_cipher = value; 2307 break; 2308 #endif /* CONFIG_IEEE80211W */ 2309 case WPA_PARAM_RSN_ENABLED: 2310 sm->rsn_enabled = value; 2311 break; 2312 case WPA_PARAM_MFP: 2313 sm->mfp = value; 2314 break; 2315 default: 2316 break; 2317 } 2318 2319 return ret; 2320 } 2321 2322 2323 /** 2324 * wpa_sm_get_param - Get WPA state machine parameters 2325 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2326 * @param: Parameter field 2327 * Returns: Parameter value 2328 */ 2329 unsigned int wpa_sm_get_param(struct wpa_sm *sm, enum wpa_sm_conf_params param) 2330 { 2331 if (sm == NULL) 2332 return 0; 2333 2334 switch (param) { 2335 case RSNA_PMK_LIFETIME: 2336 return sm->dot11RSNAConfigPMKLifetime; 2337 case RSNA_PMK_REAUTH_THRESHOLD: 2338 return sm->dot11RSNAConfigPMKReauthThreshold; 2339 case RSNA_SA_TIMEOUT: 2340 return sm->dot11RSNAConfigSATimeout; 2341 case WPA_PARAM_PROTO: 2342 return sm->proto; 2343 case WPA_PARAM_PAIRWISE: 2344 return sm->pairwise_cipher; 2345 case WPA_PARAM_GROUP: 2346 return sm->group_cipher; 2347 case WPA_PARAM_KEY_MGMT: 2348 return sm->key_mgmt; 2349 #ifdef CONFIG_IEEE80211W 2350 case WPA_PARAM_MGMT_GROUP: 2351 return sm->mgmt_group_cipher; 2352 #endif /* CONFIG_IEEE80211W */ 2353 case WPA_PARAM_RSN_ENABLED: 2354 return sm->rsn_enabled; 2355 default: 2356 return 0; 2357 } 2358 } 2359 2360 2361 /** 2362 * wpa_sm_get_status - Get WPA state machine 2363 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2364 * @buf: Buffer for status information 2365 * @buflen: Maximum buffer length 2366 * @verbose: Whether to include verbose status information 2367 * Returns: Number of bytes written to buf. 2368 * 2369 * Query WPA state machine for status information. This function fills in 2370 * a text area with current status information. If the buffer (buf) is not 2371 * large enough, status information will be truncated to fit the buffer. 2372 */ 2373 int wpa_sm_get_status(struct wpa_sm *sm, char *buf, size_t buflen, 2374 int verbose) 2375 { 2376 char *pos = buf, *end = buf + buflen; 2377 int ret; 2378 2379 ret = os_snprintf(pos, end - pos, 2380 "pairwise_cipher=%s\n" 2381 "group_cipher=%s\n" 2382 "key_mgmt=%s\n", 2383 wpa_cipher_txt(sm->pairwise_cipher), 2384 wpa_cipher_txt(sm->group_cipher), 2385 wpa_key_mgmt_txt(sm->key_mgmt, sm->proto)); 2386 if (ret < 0 || ret >= end - pos) 2387 return pos - buf; 2388 pos += ret; 2389 2390 if (sm->mfp != NO_MGMT_FRAME_PROTECTION && sm->ap_rsn_ie) { 2391 struct wpa_ie_data rsn; 2392 if (wpa_parse_wpa_ie_rsn(sm->ap_rsn_ie, sm->ap_rsn_ie_len, &rsn) 2393 >= 0 && 2394 rsn.capabilities & (WPA_CAPABILITY_MFPR | 2395 WPA_CAPABILITY_MFPC)) { 2396 ret = os_snprintf(pos, end - pos, "pmf=%d\n", 2397 (rsn.capabilities & 2398 WPA_CAPABILITY_MFPR) ? 2 : 1); 2399 if (ret < 0 || ret >= end - pos) 2400 return pos - buf; 2401 pos += ret; 2402 } 2403 } 2404 2405 return pos - buf; 2406 } 2407 2408 2409 int wpa_sm_pmf_enabled(struct wpa_sm *sm) 2410 { 2411 struct wpa_ie_data rsn; 2412 2413 if (sm->mfp == NO_MGMT_FRAME_PROTECTION || !sm->ap_rsn_ie) 2414 return 0; 2415 2416 if (wpa_parse_wpa_ie_rsn(sm->ap_rsn_ie, sm->ap_rsn_ie_len, &rsn) >= 0 && 2417 rsn.capabilities & (WPA_CAPABILITY_MFPR | WPA_CAPABILITY_MFPC)) 2418 return 1; 2419 2420 return 0; 2421 } 2422 2423 2424 /** 2425 * wpa_sm_set_assoc_wpa_ie_default - Generate own WPA/RSN IE from configuration 2426 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2427 * @wpa_ie: Pointer to buffer for WPA/RSN IE 2428 * @wpa_ie_len: Pointer to the length of the wpa_ie buffer 2429 * Returns: 0 on success, -1 on failure 2430 */ 2431 int wpa_sm_set_assoc_wpa_ie_default(struct wpa_sm *sm, u8 *wpa_ie, 2432 size_t *wpa_ie_len) 2433 { 2434 int res; 2435 2436 if (sm == NULL) 2437 return -1; 2438 2439 res = wpa_gen_wpa_ie(sm, wpa_ie, *wpa_ie_len); 2440 if (res < 0) 2441 return -1; 2442 *wpa_ie_len = res; 2443 2444 wpa_hexdump(MSG_DEBUG, "WPA: Set own WPA IE default", 2445 wpa_ie, *wpa_ie_len); 2446 2447 if (sm->assoc_wpa_ie == NULL) { 2448 /* 2449 * Make a copy of the WPA/RSN IE so that 4-Way Handshake gets 2450 * the correct version of the IE even if PMKSA caching is 2451 * aborted (which would remove PMKID from IE generation). 2452 */ 2453 sm->assoc_wpa_ie = os_malloc(*wpa_ie_len); 2454 if (sm->assoc_wpa_ie == NULL) 2455 return -1; 2456 2457 os_memcpy(sm->assoc_wpa_ie, wpa_ie, *wpa_ie_len); 2458 sm->assoc_wpa_ie_len = *wpa_ie_len; 2459 } 2460 2461 return 0; 2462 } 2463 2464 2465 /** 2466 * wpa_sm_set_assoc_wpa_ie - Set own WPA/RSN IE from (Re)AssocReq 2467 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2468 * @ie: Pointer to IE data (starting from id) 2469 * @len: IE length 2470 * Returns: 0 on success, -1 on failure 2471 * 2472 * Inform WPA state machine about the WPA/RSN IE used in (Re)Association 2473 * Request frame. The IE will be used to override the default value generated 2474 * with wpa_sm_set_assoc_wpa_ie_default(). 2475 */ 2476 int wpa_sm_set_assoc_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len) 2477 { 2478 if (sm == NULL) 2479 return -1; 2480 2481 os_free(sm->assoc_wpa_ie); 2482 if (ie == NULL || len == 0) { 2483 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 2484 "WPA: clearing own WPA/RSN IE"); 2485 sm->assoc_wpa_ie = NULL; 2486 sm->assoc_wpa_ie_len = 0; 2487 } else { 2488 wpa_hexdump(MSG_DEBUG, "WPA: set own WPA/RSN IE", ie, len); 2489 sm->assoc_wpa_ie = os_malloc(len); 2490 if (sm->assoc_wpa_ie == NULL) 2491 return -1; 2492 2493 os_memcpy(sm->assoc_wpa_ie, ie, len); 2494 sm->assoc_wpa_ie_len = len; 2495 } 2496 2497 return 0; 2498 } 2499 2500 2501 /** 2502 * wpa_sm_set_ap_wpa_ie - Set AP WPA IE from Beacon/ProbeResp 2503 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2504 * @ie: Pointer to IE data (starting from id) 2505 * @len: IE length 2506 * Returns: 0 on success, -1 on failure 2507 * 2508 * Inform WPA state machine about the WPA IE used in Beacon / Probe Response 2509 * frame. 2510 */ 2511 int wpa_sm_set_ap_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len) 2512 { 2513 if (sm == NULL) 2514 return -1; 2515 2516 os_free(sm->ap_wpa_ie); 2517 if (ie == NULL || len == 0) { 2518 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 2519 "WPA: clearing AP WPA IE"); 2520 sm->ap_wpa_ie = NULL; 2521 sm->ap_wpa_ie_len = 0; 2522 } else { 2523 wpa_hexdump(MSG_DEBUG, "WPA: set AP WPA IE", ie, len); 2524 sm->ap_wpa_ie = os_malloc(len); 2525 if (sm->ap_wpa_ie == NULL) 2526 return -1; 2527 2528 os_memcpy(sm->ap_wpa_ie, ie, len); 2529 sm->ap_wpa_ie_len = len; 2530 } 2531 2532 return 0; 2533 } 2534 2535 2536 /** 2537 * wpa_sm_set_ap_rsn_ie - Set AP RSN IE from Beacon/ProbeResp 2538 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2539 * @ie: Pointer to IE data (starting from id) 2540 * @len: IE length 2541 * Returns: 0 on success, -1 on failure 2542 * 2543 * Inform WPA state machine about the RSN IE used in Beacon / Probe Response 2544 * frame. 2545 */ 2546 int wpa_sm_set_ap_rsn_ie(struct wpa_sm *sm, const u8 *ie, size_t len) 2547 { 2548 if (sm == NULL) 2549 return -1; 2550 2551 os_free(sm->ap_rsn_ie); 2552 if (ie == NULL || len == 0) { 2553 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 2554 "WPA: clearing AP RSN IE"); 2555 sm->ap_rsn_ie = NULL; 2556 sm->ap_rsn_ie_len = 0; 2557 } else { 2558 wpa_hexdump(MSG_DEBUG, "WPA: set AP RSN IE", ie, len); 2559 sm->ap_rsn_ie = os_malloc(len); 2560 if (sm->ap_rsn_ie == NULL) 2561 return -1; 2562 2563 os_memcpy(sm->ap_rsn_ie, ie, len); 2564 sm->ap_rsn_ie_len = len; 2565 } 2566 2567 return 0; 2568 } 2569 2570 2571 /** 2572 * wpa_sm_parse_own_wpa_ie - Parse own WPA/RSN IE 2573 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2574 * @data: Pointer to data area for parsing results 2575 * Returns: 0 on success, -1 if IE is not known, or -2 on parsing failure 2576 * 2577 * Parse the contents of the own WPA or RSN IE from (Re)AssocReq and write the 2578 * parsed data into data. 2579 */ 2580 int wpa_sm_parse_own_wpa_ie(struct wpa_sm *sm, struct wpa_ie_data *data) 2581 { 2582 if (sm == NULL) 2583 return -1; 2584 2585 if (sm->assoc_wpa_ie == NULL) { 2586 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 2587 "WPA: No WPA/RSN IE available from association info"); 2588 return -1; 2589 } 2590 if (wpa_parse_wpa_ie(sm->assoc_wpa_ie, sm->assoc_wpa_ie_len, data)) 2591 return -2; 2592 return 0; 2593 } 2594 2595 2596 int wpa_sm_pmksa_cache_list(struct wpa_sm *sm, char *buf, size_t len) 2597 { 2598 return pmksa_cache_list(sm->pmksa, buf, len); 2599 } 2600 2601 2602 void wpa_sm_drop_sa(struct wpa_sm *sm) 2603 { 2604 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Clear old PMK and PTK"); 2605 sm->ptk_set = 0; 2606 sm->tptk_set = 0; 2607 os_memset(sm->pmk, 0, sizeof(sm->pmk)); 2608 os_memset(&sm->ptk, 0, sizeof(sm->ptk)); 2609 os_memset(&sm->tptk, 0, sizeof(sm->tptk)); 2610 } 2611 2612 2613 int wpa_sm_has_ptk(struct wpa_sm *sm) 2614 { 2615 if (sm == NULL) 2616 return 0; 2617 return sm->ptk_set; 2618 } 2619 2620 2621 void wpa_sm_update_replay_ctr(struct wpa_sm *sm, const u8 *replay_ctr) 2622 { 2623 os_memcpy(sm->rx_replay_counter, replay_ctr, WPA_REPLAY_COUNTER_LEN); 2624 } 2625 2626 2627 void wpa_sm_pmksa_cache_flush(struct wpa_sm *sm, void *network_ctx) 2628 { 2629 pmksa_cache_flush(sm->pmksa, network_ctx, NULL, 0); 2630 } 2631 2632 2633 #ifdef CONFIG_WNM 2634 int wpa_wnmsleep_install_key(struct wpa_sm *sm, u8 subelem_id, u8 *buf) 2635 { 2636 struct wpa_gtk_data gd; 2637 #ifdef CONFIG_IEEE80211W 2638 struct wpa_igtk_kde igd; 2639 u16 keyidx; 2640 #endif /* CONFIG_IEEE80211W */ 2641 u16 keyinfo; 2642 u8 keylen; /* plaintext key len */ 2643 u8 *key_rsc; 2644 2645 os_memset(&gd, 0, sizeof(gd)); 2646 #ifdef CONFIG_IEEE80211W 2647 os_memset(&igd, 0, sizeof(igd)); 2648 #endif /* CONFIG_IEEE80211W */ 2649 2650 keylen = wpa_cipher_key_len(sm->group_cipher); 2651 gd.key_rsc_len = wpa_cipher_rsc_len(sm->group_cipher); 2652 gd.alg = wpa_cipher_to_alg(sm->group_cipher); 2653 if (gd.alg == WPA_ALG_NONE) { 2654 wpa_printf(MSG_DEBUG, "Unsupported group cipher suite"); 2655 return -1; 2656 } 2657 2658 if (subelem_id == WNM_SLEEP_SUBELEM_GTK) { 2659 key_rsc = buf + 5; 2660 keyinfo = WPA_GET_LE16(buf + 2); 2661 gd.gtk_len = keylen; 2662 if (gd.gtk_len != buf[4]) { 2663 wpa_printf(MSG_DEBUG, "GTK len mismatch len %d vs %d", 2664 gd.gtk_len, buf[4]); 2665 return -1; 2666 } 2667 gd.keyidx = keyinfo & 0x03; /* B0 - B1 */ 2668 gd.tx = wpa_supplicant_gtk_tx_bit_workaround( 2669 sm, !!(keyinfo & WPA_KEY_INFO_TXRX)); 2670 2671 os_memcpy(gd.gtk, buf + 13, gd.gtk_len); 2672 2673 wpa_hexdump_key(MSG_DEBUG, "Install GTK (WNM SLEEP)", 2674 gd.gtk, gd.gtk_len); 2675 if (wpa_supplicant_install_gtk(sm, &gd, key_rsc)) { 2676 wpa_printf(MSG_DEBUG, "Failed to install the GTK in " 2677 "WNM mode"); 2678 return -1; 2679 } 2680 #ifdef CONFIG_IEEE80211W 2681 } else if (subelem_id == WNM_SLEEP_SUBELEM_IGTK) { 2682 os_memcpy(igd.keyid, buf + 2, 2); 2683 os_memcpy(igd.pn, buf + 4, 6); 2684 2685 keyidx = WPA_GET_LE16(igd.keyid); 2686 os_memcpy(igd.igtk, buf + 10, WPA_IGTK_LEN); 2687 2688 wpa_hexdump_key(MSG_DEBUG, "Install IGTK (WNM SLEEP)", 2689 igd.igtk, WPA_IGTK_LEN); 2690 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, 2691 keyidx, 0, igd.pn, sizeof(igd.pn), 2692 igd.igtk, WPA_IGTK_LEN) < 0) { 2693 wpa_printf(MSG_DEBUG, "Failed to install the IGTK in " 2694 "WNM mode"); 2695 return -1; 2696 } 2697 #endif /* CONFIG_IEEE80211W */ 2698 } else { 2699 wpa_printf(MSG_DEBUG, "Unknown element id"); 2700 return -1; 2701 } 2702 2703 return 0; 2704 } 2705 #endif /* CONFIG_WNM */ 2706
