1 /* 2 * WPA Supplicant - WPA state machine and EAPOL-Key processing 3 * Copyright (c) 2003-2018, Jouni Malinen <j@w1.fi> 4 * Copyright(c) 2015 Intel Deutschland GmbH 5 * 6 * This software may be distributed under the terms of the BSD license. 7 * See README for more details. 8 */ 9 10 #include "includes.h" 11 12 #include "common.h" 13 #include "crypto/aes.h" 14 #include "crypto/aes_wrap.h" 15 #include "crypto/crypto.h" 16 #include "crypto/random.h" 17 #include "crypto/aes_siv.h" 18 #include "crypto/sha256.h" 19 #include "crypto/sha384.h" 20 #include "crypto/sha512.h" 21 #include "common/ieee802_11_defs.h" 22 #include "common/ieee802_11_common.h" 23 #include "common/ocv.h" 24 #include "eap_common/eap_defs.h" 25 #include "eapol_supp/eapol_supp_sm.h" 26 #include "drivers/driver.h" 27 #include "wpa.h" 28 #include "eloop.h" 29 #include "preauth.h" 30 #include "pmksa_cache.h" 31 #include "wpa_i.h" 32 #include "wpa_ie.h" 33 34 35 static const u8 null_rsc[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 36 37 38 /** 39 * wpa_eapol_key_send - Send WPA/RSN EAPOL-Key message 40 * @sm: Pointer to WPA state machine data from wpa_sm_init() 41 * @ptk: PTK for Key Confirmation/Encryption Key 42 * @ver: Version field from Key Info 43 * @dest: Destination address for the frame 44 * @proto: Ethertype (usually ETH_P_EAPOL) 45 * @msg: EAPOL-Key message 46 * @msg_len: Length of message 47 * @key_mic: Pointer to the buffer to which the EAPOL-Key MIC is written 48 * Returns: >= 0 on success, < 0 on failure 49 */ 50 int wpa_eapol_key_send(struct wpa_sm *sm, struct wpa_ptk *ptk, 51 int ver, const u8 *dest, u16 proto, 52 u8 *msg, size_t msg_len, u8 *key_mic) 53 { 54 int ret = -1; 55 size_t mic_len = wpa_mic_len(sm->key_mgmt, sm->pmk_len); 56 57 wpa_printf(MSG_DEBUG, "WPA: Send EAPOL-Key frame to " MACSTR 58 " ver=%d mic_len=%d key_mgmt=0x%x", 59 MAC2STR(dest), ver, (int) mic_len, sm->key_mgmt); 60 if (is_zero_ether_addr(dest) && is_zero_ether_addr(sm->bssid)) { 61 /* 62 * Association event was not yet received; try to fetch 63 * BSSID from the driver. 64 */ 65 if (wpa_sm_get_bssid(sm, sm->bssid) < 0) { 66 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 67 "WPA: Failed to read BSSID for " 68 "EAPOL-Key destination address"); 69 } else { 70 dest = sm->bssid; 71 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 72 "WPA: Use BSSID (" MACSTR 73 ") as the destination for EAPOL-Key", 74 MAC2STR(dest)); 75 } 76 } 77 78 if (mic_len) { 79 if (key_mic && (!ptk || !ptk->kck_len)) 80 goto out; 81 82 if (key_mic && 83 wpa_eapol_key_mic(ptk->kck, ptk->kck_len, sm->key_mgmt, ver, 84 msg, msg_len, key_mic)) { 85 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR, 86 "WPA: Failed to generate EAPOL-Key version %d key_mgmt 0x%x MIC", 87 ver, sm->key_mgmt); 88 goto out; 89 } 90 if (ptk) 91 wpa_hexdump_key(MSG_DEBUG, "WPA: KCK", 92 ptk->kck, ptk->kck_len); 93 wpa_hexdump(MSG_DEBUG, "WPA: Derived Key MIC", 94 key_mic, mic_len); 95 } else { 96 #ifdef CONFIG_FILS 97 /* AEAD cipher - Key MIC field not used */ 98 struct ieee802_1x_hdr *s_hdr, *hdr; 99 struct wpa_eapol_key *s_key, *key; 100 u8 *buf, *s_key_data, *key_data; 101 size_t buf_len = msg_len + AES_BLOCK_SIZE; 102 size_t key_data_len; 103 u16 eapol_len; 104 const u8 *aad[1]; 105 size_t aad_len[1]; 106 107 if (!ptk || !ptk->kek_len) 108 goto out; 109 110 key_data_len = msg_len - sizeof(struct ieee802_1x_hdr) - 111 sizeof(struct wpa_eapol_key) - 2; 112 113 buf = os_malloc(buf_len); 114 if (!buf) 115 goto out; 116 117 os_memcpy(buf, msg, msg_len); 118 hdr = (struct ieee802_1x_hdr *) buf; 119 key = (struct wpa_eapol_key *) (hdr + 1); 120 key_data = ((u8 *) (key + 1)) + 2; 121 122 /* Update EAPOL header to include AES-SIV overhead */ 123 eapol_len = be_to_host16(hdr->length); 124 eapol_len += AES_BLOCK_SIZE; 125 hdr->length = host_to_be16(eapol_len); 126 127 /* Update Key Data Length field to include AES-SIV overhead */ 128 WPA_PUT_BE16((u8 *) (key + 1), AES_BLOCK_SIZE + key_data_len); 129 130 s_hdr = (struct ieee802_1x_hdr *) msg; 131 s_key = (struct wpa_eapol_key *) (s_hdr + 1); 132 s_key_data = ((u8 *) (s_key + 1)) + 2; 133 134 wpa_hexdump_key(MSG_DEBUG, "WPA: Plaintext Key Data", 135 s_key_data, key_data_len); 136 137 wpa_hexdump_key(MSG_DEBUG, "WPA: KEK", ptk->kek, ptk->kek_len); 138 /* AES-SIV AAD from EAPOL protocol version field (inclusive) to 139 * to Key Data (exclusive). */ 140 aad[0] = buf; 141 aad_len[0] = key_data - buf; 142 if (aes_siv_encrypt(ptk->kek, ptk->kek_len, 143 s_key_data, key_data_len, 144 1, aad, aad_len, key_data) < 0) { 145 os_free(buf); 146 goto out; 147 } 148 149 wpa_hexdump(MSG_DEBUG, "WPA: Encrypted Key Data from SIV", 150 key_data, AES_BLOCK_SIZE + key_data_len); 151 152 os_free(msg); 153 msg = buf; 154 msg_len = buf_len; 155 #else /* CONFIG_FILS */ 156 goto out; 157 #endif /* CONFIG_FILS */ 158 } 159 160 wpa_hexdump(MSG_MSGDUMP, "WPA: TX EAPOL-Key", msg, msg_len); 161 ret = wpa_sm_ether_send(sm, dest, proto, msg, msg_len); 162 eapol_sm_notify_tx_eapol_key(sm->eapol); 163 out: 164 os_free(msg); 165 return ret; 166 } 167 168 169 /** 170 * wpa_sm_key_request - Send EAPOL-Key Request 171 * @sm: Pointer to WPA state machine data from wpa_sm_init() 172 * @error: Indicate whether this is an Michael MIC error report 173 * @pairwise: 1 = error report for pairwise packet, 0 = for group packet 174 * 175 * Send an EAPOL-Key Request to the current authenticator. This function is 176 * used to request rekeying and it is usually called when a local Michael MIC 177 * failure is detected. 178 */ 179 void wpa_sm_key_request(struct wpa_sm *sm, int error, int pairwise) 180 { 181 size_t mic_len, hdrlen, rlen; 182 struct wpa_eapol_key *reply; 183 int key_info, ver; 184 u8 bssid[ETH_ALEN], *rbuf, *key_mic, *mic; 185 186 if (wpa_use_akm_defined(sm->key_mgmt)) 187 ver = WPA_KEY_INFO_TYPE_AKM_DEFINED; 188 else if (wpa_key_mgmt_ft(sm->key_mgmt) || 189 wpa_key_mgmt_sha256(sm->key_mgmt)) 190 ver = WPA_KEY_INFO_TYPE_AES_128_CMAC; 191 else if (sm->pairwise_cipher != WPA_CIPHER_TKIP) 192 ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES; 193 else 194 ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4; 195 196 if (wpa_sm_get_bssid(sm, bssid) < 0) { 197 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 198 "Failed to read BSSID for EAPOL-Key request"); 199 return; 200 } 201 202 mic_len = wpa_mic_len(sm->key_mgmt, sm->pmk_len); 203 hdrlen = sizeof(*reply) + mic_len + 2; 204 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL, 205 hdrlen, &rlen, (void *) &reply); 206 if (rbuf == NULL) 207 return; 208 209 reply->type = (sm->proto == WPA_PROTO_RSN || 210 sm->proto == WPA_PROTO_OSEN) ? 211 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; 212 key_info = WPA_KEY_INFO_REQUEST | ver; 213 if (sm->ptk_set) 214 key_info |= WPA_KEY_INFO_SECURE; 215 if (sm->ptk_set && mic_len) 216 key_info |= WPA_KEY_INFO_MIC; 217 if (error) 218 key_info |= WPA_KEY_INFO_ERROR; 219 if (pairwise) 220 key_info |= WPA_KEY_INFO_KEY_TYPE; 221 WPA_PUT_BE16(reply->key_info, key_info); 222 WPA_PUT_BE16(reply->key_length, 0); 223 os_memcpy(reply->replay_counter, sm->request_counter, 224 WPA_REPLAY_COUNTER_LEN); 225 inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN); 226 227 mic = (u8 *) (reply + 1); 228 WPA_PUT_BE16(mic + mic_len, 0); 229 if (!(key_info & WPA_KEY_INFO_MIC)) 230 key_mic = NULL; 231 else 232 key_mic = mic; 233 234 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 235 "WPA: Sending EAPOL-Key Request (error=%d " 236 "pairwise=%d ptk_set=%d len=%lu)", 237 error, pairwise, sm->ptk_set, (unsigned long) rlen); 238 wpa_eapol_key_send(sm, &sm->ptk, ver, bssid, ETH_P_EAPOL, rbuf, rlen, 239 key_mic); 240 } 241 242 243 static void wpa_supplicant_key_mgmt_set_pmk(struct wpa_sm *sm) 244 { 245 #ifdef CONFIG_IEEE80211R 246 if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) { 247 if (wpa_sm_key_mgmt_set_pmk(sm, sm->xxkey, sm->xxkey_len)) 248 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 249 "RSN: Cannot set low order 256 bits of MSK for key management offload"); 250 } else { 251 #endif /* CONFIG_IEEE80211R */ 252 if (wpa_sm_key_mgmt_set_pmk(sm, sm->pmk, sm->pmk_len)) 253 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 254 "RSN: Cannot set PMK for key management offload"); 255 #ifdef CONFIG_IEEE80211R 256 } 257 #endif /* CONFIG_IEEE80211R */ 258 } 259 260 261 static int wpa_supplicant_get_pmk(struct wpa_sm *sm, 262 const unsigned char *src_addr, 263 const u8 *pmkid) 264 { 265 int abort_cached = 0; 266 267 if (pmkid && !sm->cur_pmksa) { 268 /* When using drivers that generate RSN IE, wpa_supplicant may 269 * not have enough time to get the association information 270 * event before receiving this 1/4 message, so try to find a 271 * matching PMKSA cache entry here. */ 272 sm->cur_pmksa = pmksa_cache_get(sm->pmksa, src_addr, pmkid, 273 NULL, 0); 274 if (sm->cur_pmksa) { 275 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 276 "RSN: found matching PMKID from PMKSA cache"); 277 } else { 278 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 279 "RSN: no matching PMKID found"); 280 abort_cached = 1; 281 } 282 } 283 284 if (pmkid && sm->cur_pmksa && 285 os_memcmp_const(pmkid, sm->cur_pmksa->pmkid, PMKID_LEN) == 0) { 286 wpa_hexdump(MSG_DEBUG, "RSN: matched PMKID", pmkid, PMKID_LEN); 287 wpa_sm_set_pmk_from_pmksa(sm); 288 wpa_hexdump_key(MSG_DEBUG, "RSN: PMK from PMKSA cache", 289 sm->pmk, sm->pmk_len); 290 eapol_sm_notify_cached(sm->eapol); 291 #ifdef CONFIG_IEEE80211R 292 sm->xxkey_len = 0; 293 #ifdef CONFIG_SAE 294 if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE && 295 sm->pmk_len == PMK_LEN) { 296 /* Need to allow FT key derivation to proceed with 297 * PMK from SAE being used as the XXKey in cases where 298 * the PMKID in msg 1/4 matches the PMKSA entry that was 299 * just added based on SAE authentication for the 300 * initial mobility domain association. */ 301 os_memcpy(sm->xxkey, sm->pmk, sm->pmk_len); 302 sm->xxkey_len = sm->pmk_len; 303 } 304 #endif /* CONFIG_SAE */ 305 #endif /* CONFIG_IEEE80211R */ 306 } else if (wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt) && sm->eapol) { 307 int res, pmk_len; 308 #ifdef CONFIG_IEEE80211R 309 u8 buf[2 * PMK_LEN]; 310 #endif /* CONFIG_IEEE80211R */ 311 312 if (wpa_key_mgmt_sha384(sm->key_mgmt)) 313 pmk_len = PMK_LEN_SUITE_B_192; 314 else 315 pmk_len = PMK_LEN; 316 res = eapol_sm_get_key(sm->eapol, sm->pmk, pmk_len); 317 if (res) { 318 if (pmk_len == PMK_LEN) { 319 /* 320 * EAP-LEAP is an exception from other EAP 321 * methods: it uses only 16-byte PMK. 322 */ 323 res = eapol_sm_get_key(sm->eapol, sm->pmk, 16); 324 pmk_len = 16; 325 } 326 } 327 #ifdef CONFIG_IEEE80211R 328 if (res == 0 && 329 eapol_sm_get_key(sm->eapol, buf, 2 * PMK_LEN) == 0) { 330 if (wpa_key_mgmt_sha384(sm->key_mgmt)) { 331 os_memcpy(sm->xxkey, buf, SHA384_MAC_LEN); 332 sm->xxkey_len = SHA384_MAC_LEN; 333 } else { 334 os_memcpy(sm->xxkey, buf + PMK_LEN, PMK_LEN); 335 sm->xxkey_len = PMK_LEN; 336 } 337 forced_memzero(buf, sizeof(buf)); 338 if (sm->proto == WPA_PROTO_RSN && 339 wpa_key_mgmt_ft(sm->key_mgmt)) { 340 struct rsn_pmksa_cache_entry *sa = NULL; 341 const u8 *fils_cache_id = NULL; 342 343 #ifdef CONFIG_FILS 344 if (sm->fils_cache_id_set) 345 fils_cache_id = sm->fils_cache_id; 346 #endif /* CONFIG_FILS */ 347 wpa_hexdump_key(MSG_DEBUG, 348 "FT: Cache XXKey/MPMK", 349 sm->xxkey, sm->xxkey_len); 350 sa = pmksa_cache_add(sm->pmksa, 351 sm->xxkey, sm->xxkey_len, 352 NULL, NULL, 0, 353 src_addr, sm->own_addr, 354 sm->network_ctx, 355 sm->key_mgmt, 356 fils_cache_id); 357 if (!sm->cur_pmksa) 358 sm->cur_pmksa = sa; 359 } 360 } 361 #endif /* CONFIG_IEEE80211R */ 362 if (res == 0) { 363 struct rsn_pmksa_cache_entry *sa = NULL; 364 const u8 *fils_cache_id = NULL; 365 366 #ifdef CONFIG_FILS 367 if (sm->fils_cache_id_set) 368 fils_cache_id = sm->fils_cache_id; 369 #endif /* CONFIG_FILS */ 370 371 wpa_hexdump_key(MSG_DEBUG, "WPA: PMK from EAPOL state " 372 "machines", sm->pmk, pmk_len); 373 sm->pmk_len = pmk_len; 374 wpa_supplicant_key_mgmt_set_pmk(sm); 375 if (sm->proto == WPA_PROTO_RSN && 376 !wpa_key_mgmt_suite_b(sm->key_mgmt) && 377 !wpa_key_mgmt_ft(sm->key_mgmt)) { 378 sa = pmksa_cache_add(sm->pmksa, 379 sm->pmk, pmk_len, NULL, 380 NULL, 0, 381 src_addr, sm->own_addr, 382 sm->network_ctx, 383 sm->key_mgmt, 384 fils_cache_id); 385 } 386 if (!sm->cur_pmksa && pmkid && 387 pmksa_cache_get(sm->pmksa, src_addr, pmkid, NULL, 388 0)) { 389 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 390 "RSN: the new PMK matches with the " 391 "PMKID"); 392 abort_cached = 0; 393 } else if (sa && !sm->cur_pmksa && pmkid) { 394 /* 395 * It looks like the authentication server 396 * derived mismatching MSK. This should not 397 * really happen, but bugs happen.. There is not 398 * much we can do here without knowing what 399 * exactly caused the server to misbehave. 400 */ 401 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 402 "RSN: PMKID mismatch - authentication server may have derived different MSK?!"); 403 return -1; 404 } 405 406 if (!sm->cur_pmksa) 407 sm->cur_pmksa = sa; 408 #ifdef CONFIG_IEEE80211R 409 } else if (wpa_key_mgmt_ft(sm->key_mgmt) && sm->ft_protocol) { 410 wpa_printf(MSG_DEBUG, 411 "FT: Continue 4-way handshake without PMK/PMKID for association using FT protocol"); 412 #endif /* CONFIG_IEEE80211R */ 413 } else { 414 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 415 "WPA: Failed to get master session key from " 416 "EAPOL state machines - key handshake " 417 "aborted"); 418 if (sm->cur_pmksa) { 419 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 420 "RSN: Cancelled PMKSA caching " 421 "attempt"); 422 sm->cur_pmksa = NULL; 423 abort_cached = 1; 424 } else if (!abort_cached) { 425 return -1; 426 } 427 } 428 } 429 430 if (abort_cached && wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt) && 431 !wpa_key_mgmt_suite_b(sm->key_mgmt) && 432 !wpa_key_mgmt_ft(sm->key_mgmt) && sm->key_mgmt != WPA_KEY_MGMT_OSEN) 433 { 434 /* Send EAPOL-Start to trigger full EAP authentication. */ 435 u8 *buf; 436 size_t buflen; 437 438 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 439 "RSN: no PMKSA entry found - trigger " 440 "full EAP authentication"); 441 buf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_START, 442 NULL, 0, &buflen, NULL); 443 if (buf) { 444 wpa_sm_ether_send(sm, sm->bssid, ETH_P_EAPOL, 445 buf, buflen); 446 os_free(buf); 447 return -2; 448 } 449 450 return -1; 451 } 452 453 return 0; 454 } 455 456 457 /** 458 * wpa_supplicant_send_2_of_4 - Send message 2 of WPA/RSN 4-Way Handshake 459 * @sm: Pointer to WPA state machine data from wpa_sm_init() 460 * @dst: Destination address for the frame 461 * @key: Pointer to the EAPOL-Key frame header 462 * @ver: Version bits from EAPOL-Key Key Info 463 * @nonce: Nonce value for the EAPOL-Key frame 464 * @wpa_ie: WPA/RSN IE 465 * @wpa_ie_len: Length of the WPA/RSN IE 466 * @ptk: PTK to use for keyed hash and encryption 467 * Returns: >= 0 on success, < 0 on failure 468 */ 469 int wpa_supplicant_send_2_of_4(struct wpa_sm *sm, const unsigned char *dst, 470 const struct wpa_eapol_key *key, 471 int ver, const u8 *nonce, 472 const u8 *wpa_ie, size_t wpa_ie_len, 473 struct wpa_ptk *ptk) 474 { 475 size_t mic_len, hdrlen, rlen; 476 struct wpa_eapol_key *reply; 477 u8 *rbuf, *key_mic; 478 u8 *rsn_ie_buf = NULL; 479 u16 key_info; 480 481 if (wpa_ie == NULL) { 482 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "WPA: No wpa_ie set - " 483 "cannot generate msg 2/4"); 484 return -1; 485 } 486 487 #ifdef CONFIG_IEEE80211R 488 if (wpa_key_mgmt_ft(sm->key_mgmt)) { 489 int res; 490 491 /* 492 * Add PMKR1Name into RSN IE (PMKID-List) and add MDIE and 493 * FTIE from (Re)Association Response. 494 */ 495 rsn_ie_buf = os_malloc(wpa_ie_len + 2 + 2 + PMKID_LEN + 496 sm->assoc_resp_ies_len); 497 if (rsn_ie_buf == NULL) 498 return -1; 499 os_memcpy(rsn_ie_buf, wpa_ie, wpa_ie_len); 500 res = wpa_insert_pmkid(rsn_ie_buf, &wpa_ie_len, 501 sm->pmk_r1_name); 502 if (res < 0) { 503 os_free(rsn_ie_buf); 504 return -1; 505 } 506 507 if (sm->assoc_resp_ies) { 508 os_memcpy(rsn_ie_buf + wpa_ie_len, sm->assoc_resp_ies, 509 sm->assoc_resp_ies_len); 510 wpa_ie_len += sm->assoc_resp_ies_len; 511 } 512 513 wpa_ie = rsn_ie_buf; 514 } 515 #endif /* CONFIG_IEEE80211R */ 516 517 wpa_hexdump(MSG_DEBUG, "WPA: WPA IE for msg 2/4", wpa_ie, wpa_ie_len); 518 519 mic_len = wpa_mic_len(sm->key_mgmt, sm->pmk_len); 520 hdrlen = sizeof(*reply) + mic_len + 2; 521 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, 522 NULL, hdrlen + wpa_ie_len, 523 &rlen, (void *) &reply); 524 if (rbuf == NULL) { 525 os_free(rsn_ie_buf); 526 return -1; 527 } 528 529 reply->type = (sm->proto == WPA_PROTO_RSN || 530 sm->proto == WPA_PROTO_OSEN) ? 531 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; 532 key_info = ver | WPA_KEY_INFO_KEY_TYPE; 533 if (mic_len) 534 key_info |= WPA_KEY_INFO_MIC; 535 else 536 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA; 537 WPA_PUT_BE16(reply->key_info, key_info); 538 if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) 539 WPA_PUT_BE16(reply->key_length, 0); 540 else 541 os_memcpy(reply->key_length, key->key_length, 2); 542 os_memcpy(reply->replay_counter, key->replay_counter, 543 WPA_REPLAY_COUNTER_LEN); 544 wpa_hexdump(MSG_DEBUG, "WPA: Replay Counter", reply->replay_counter, 545 WPA_REPLAY_COUNTER_LEN); 546 547 key_mic = (u8 *) (reply + 1); 548 WPA_PUT_BE16(key_mic + mic_len, wpa_ie_len); /* Key Data Length */ 549 os_memcpy(key_mic + mic_len + 2, wpa_ie, wpa_ie_len); /* Key Data */ 550 os_free(rsn_ie_buf); 551 552 os_memcpy(reply->key_nonce, nonce, WPA_NONCE_LEN); 553 554 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 2/4"); 555 return wpa_eapol_key_send(sm, ptk, ver, dst, ETH_P_EAPOL, rbuf, rlen, 556 key_mic); 557 } 558 559 560 static int wpa_derive_ptk(struct wpa_sm *sm, const unsigned char *src_addr, 561 const struct wpa_eapol_key *key, struct wpa_ptk *ptk) 562 { 563 const u8 *z = NULL; 564 size_t z_len = 0; 565 566 #ifdef CONFIG_IEEE80211R 567 if (wpa_key_mgmt_ft(sm->key_mgmt)) 568 return wpa_derive_ptk_ft(sm, src_addr, key, ptk); 569 #endif /* CONFIG_IEEE80211R */ 570 571 #ifdef CONFIG_DPP2 572 if (sm->key_mgmt == WPA_KEY_MGMT_DPP && sm->dpp_z) { 573 z = wpabuf_head(sm->dpp_z); 574 z_len = wpabuf_len(sm->dpp_z); 575 } 576 #endif /* CONFIG_DPP2 */ 577 578 return wpa_pmk_to_ptk(sm->pmk, sm->pmk_len, "Pairwise key expansion", 579 sm->own_addr, sm->bssid, sm->snonce, 580 key->key_nonce, ptk, sm->key_mgmt, 581 sm->pairwise_cipher, z, z_len); 582 } 583 584 585 static void wpa_supplicant_process_1_of_4(struct wpa_sm *sm, 586 const unsigned char *src_addr, 587 const struct wpa_eapol_key *key, 588 u16 ver, const u8 *key_data, 589 size_t key_data_len) 590 { 591 struct wpa_eapol_ie_parse ie; 592 struct wpa_ptk *ptk; 593 int res; 594 u8 *kde, *kde_buf = NULL; 595 size_t kde_len; 596 597 if (wpa_sm_get_network_ctx(sm) == NULL) { 598 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "WPA: No SSID info " 599 "found (msg 1 of 4)"); 600 return; 601 } 602 603 wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE); 604 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: RX message 1 of 4-Way " 605 "Handshake from " MACSTR " (ver=%d)", MAC2STR(src_addr), ver); 606 607 os_memset(&ie, 0, sizeof(ie)); 608 609 if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) { 610 /* RSN: msg 1/4 should contain PMKID for the selected PMK */ 611 wpa_hexdump(MSG_DEBUG, "RSN: msg 1/4 key data", 612 key_data, key_data_len); 613 if (wpa_supplicant_parse_ies(key_data, key_data_len, &ie) < 0) 614 goto failed; 615 if (ie.pmkid) { 616 wpa_hexdump(MSG_DEBUG, "RSN: PMKID from " 617 "Authenticator", ie.pmkid, PMKID_LEN); 618 } 619 } 620 621 res = wpa_supplicant_get_pmk(sm, src_addr, ie.pmkid); 622 if (res == -2) { 623 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "RSN: Do not reply to " 624 "msg 1/4 - requesting full EAP authentication"); 625 return; 626 } 627 if (res) 628 goto failed; 629 630 if (sm->renew_snonce) { 631 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) { 632 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 633 "WPA: Failed to get random data for SNonce"); 634 goto failed; 635 } 636 sm->renew_snonce = 0; 637 wpa_hexdump(MSG_DEBUG, "WPA: Renewed SNonce", 638 sm->snonce, WPA_NONCE_LEN); 639 } 640 641 /* Calculate PTK which will be stored as a temporary PTK until it has 642 * been verified when processing message 3/4. */ 643 ptk = &sm->tptk; 644 if (wpa_derive_ptk(sm, src_addr, key, ptk) < 0) 645 goto failed; 646 if (sm->pairwise_cipher == WPA_CIPHER_TKIP) { 647 u8 buf[8]; 648 /* Supplicant: swap tx/rx Mic keys */ 649 os_memcpy(buf, &ptk->tk[16], 8); 650 os_memcpy(&ptk->tk[16], &ptk->tk[24], 8); 651 os_memcpy(&ptk->tk[24], buf, 8); 652 forced_memzero(buf, sizeof(buf)); 653 } 654 sm->tptk_set = 1; 655 656 kde = sm->assoc_wpa_ie; 657 kde_len = sm->assoc_wpa_ie_len; 658 659 #ifdef CONFIG_OCV 660 if (wpa_sm_ocv_enabled(sm)) { 661 struct wpa_channel_info ci; 662 u8 *pos; 663 664 if (wpa_sm_channel_info(sm, &ci) != 0) { 665 wpa_printf(MSG_WARNING, 666 "Failed to get channel info for OCI element in EAPOL-Key 2/4"); 667 goto failed; 668 } 669 670 kde_buf = os_malloc(kde_len + 2 + RSN_SELECTOR_LEN + 3); 671 if (!kde_buf) { 672 wpa_printf(MSG_WARNING, 673 "Failed to allocate memory for KDE with OCI in EAPOL-Key 2/4"); 674 goto failed; 675 } 676 677 os_memcpy(kde_buf, kde, kde_len); 678 kde = kde_buf; 679 pos = kde + kde_len; 680 if (ocv_insert_oci_kde(&ci, &pos) < 0) 681 goto failed; 682 kde_len = pos - kde; 683 } 684 #endif /* CONFIG_OCV */ 685 686 #ifdef CONFIG_P2P 687 if (sm->p2p) { 688 kde_buf = os_malloc(kde_len + 2 + RSN_SELECTOR_LEN + 1); 689 if (kde_buf) { 690 u8 *pos; 691 wpa_printf(MSG_DEBUG, "P2P: Add IP Address Request KDE " 692 "into EAPOL-Key 2/4"); 693 os_memcpy(kde_buf, kde, kde_len); 694 kde = kde_buf; 695 pos = kde + kde_len; 696 *pos++ = WLAN_EID_VENDOR_SPECIFIC; 697 *pos++ = RSN_SELECTOR_LEN + 1; 698 RSN_SELECTOR_PUT(pos, WFA_KEY_DATA_IP_ADDR_REQ); 699 pos += RSN_SELECTOR_LEN; 700 *pos++ = 0x01; 701 kde_len = pos - kde; 702 } 703 } 704 #endif /* CONFIG_P2P */ 705 706 if (wpa_supplicant_send_2_of_4(sm, sm->bssid, key, ver, sm->snonce, 707 kde, kde_len, ptk) < 0) 708 goto failed; 709 710 os_free(kde_buf); 711 os_memcpy(sm->anonce, key->key_nonce, WPA_NONCE_LEN); 712 return; 713 714 failed: 715 os_free(kde_buf); 716 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED); 717 } 718 719 720 static void wpa_sm_start_preauth(void *eloop_ctx, void *timeout_ctx) 721 { 722 struct wpa_sm *sm = eloop_ctx; 723 rsn_preauth_candidate_process(sm); 724 } 725 726 727 static void wpa_supplicant_key_neg_complete(struct wpa_sm *sm, 728 const u8 *addr, int secure) 729 { 730 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 731 "WPA: Key negotiation completed with " 732 MACSTR " [PTK=%s GTK=%s]", MAC2STR(addr), 733 wpa_cipher_txt(sm->pairwise_cipher), 734 wpa_cipher_txt(sm->group_cipher)); 735 wpa_sm_cancel_auth_timeout(sm); 736 wpa_sm_set_state(sm, WPA_COMPLETED); 737 738 if (secure) { 739 wpa_sm_mlme_setprotection( 740 sm, addr, MLME_SETPROTECTION_PROTECT_TYPE_RX_TX, 741 MLME_SETPROTECTION_KEY_TYPE_PAIRWISE); 742 eapol_sm_notify_portValid(sm->eapol, TRUE); 743 if (wpa_key_mgmt_wpa_psk(sm->key_mgmt) || 744 sm->key_mgmt == WPA_KEY_MGMT_DPP || 745 sm->key_mgmt == WPA_KEY_MGMT_OWE) 746 eapol_sm_notify_eap_success(sm->eapol, TRUE); 747 /* 748 * Start preauthentication after a short wait to avoid a 749 * possible race condition between the data receive and key 750 * configuration after the 4-Way Handshake. This increases the 751 * likelihood of the first preauth EAPOL-Start frame getting to 752 * the target AP. 753 */ 754 if (!dl_list_empty(&sm->pmksa_candidates)) 755 eloop_register_timeout(1, 0, wpa_sm_start_preauth, 756 sm, NULL); 757 } 758 759 if (sm->cur_pmksa && sm->cur_pmksa->opportunistic) { 760 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 761 "RSN: Authenticator accepted " 762 "opportunistic PMKSA entry - marking it valid"); 763 sm->cur_pmksa->opportunistic = 0; 764 } 765 766 #ifdef CONFIG_IEEE80211R 767 if (wpa_key_mgmt_ft(sm->key_mgmt)) { 768 /* Prepare for the next transition */ 769 wpa_ft_prepare_auth_request(sm, NULL); 770 } 771 #endif /* CONFIG_IEEE80211R */ 772 } 773 774 775 static void wpa_sm_rekey_ptk(void *eloop_ctx, void *timeout_ctx) 776 { 777 struct wpa_sm *sm = eloop_ctx; 778 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Request PTK rekeying"); 779 wpa_sm_key_request(sm, 0, 1); 780 } 781 782 783 static int wpa_supplicant_install_ptk(struct wpa_sm *sm, 784 const struct wpa_eapol_key *key) 785 { 786 int keylen, rsclen; 787 enum wpa_alg alg; 788 const u8 *key_rsc; 789 790 if (sm->ptk.installed) { 791 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 792 "WPA: Do not re-install same PTK to the driver"); 793 return 0; 794 } 795 796 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 797 "WPA: Installing PTK to the driver"); 798 799 if (sm->pairwise_cipher == WPA_CIPHER_NONE) { 800 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Pairwise Cipher " 801 "Suite: NONE - do not use pairwise keys"); 802 return 0; 803 } 804 805 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) { 806 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 807 "WPA: Unsupported pairwise cipher %d", 808 sm->pairwise_cipher); 809 return -1; 810 } 811 812 alg = wpa_cipher_to_alg(sm->pairwise_cipher); 813 keylen = wpa_cipher_key_len(sm->pairwise_cipher); 814 if (keylen <= 0 || (unsigned int) keylen != sm->ptk.tk_len) { 815 wpa_printf(MSG_DEBUG, "WPA: TK length mismatch: %d != %lu", 816 keylen, (long unsigned int) sm->ptk.tk_len); 817 return -1; 818 } 819 rsclen = wpa_cipher_rsc_len(sm->pairwise_cipher); 820 821 if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) { 822 key_rsc = null_rsc; 823 } else { 824 key_rsc = key->key_rsc; 825 wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, rsclen); 826 } 827 828 if (wpa_sm_set_key(sm, alg, sm->bssid, 0, 1, key_rsc, rsclen, 829 sm->ptk.tk, keylen) < 0) { 830 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 831 "WPA: Failed to set PTK to the " 832 "driver (alg=%d keylen=%d bssid=" MACSTR ")", 833 alg, keylen, MAC2STR(sm->bssid)); 834 return -1; 835 } 836 837 /* TK is not needed anymore in supplicant */ 838 os_memset(sm->ptk.tk, 0, WPA_TK_MAX_LEN); 839 sm->ptk.tk_len = 0; 840 sm->ptk.installed = 1; 841 842 if (sm->wpa_ptk_rekey) { 843 eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL); 844 eloop_register_timeout(sm->wpa_ptk_rekey, 0, wpa_sm_rekey_ptk, 845 sm, NULL); 846 } 847 848 return 0; 849 } 850 851 852 static int wpa_supplicant_check_group_cipher(struct wpa_sm *sm, 853 int group_cipher, 854 int keylen, int maxkeylen, 855 int *key_rsc_len, 856 enum wpa_alg *alg) 857 { 858 int klen; 859 860 *alg = wpa_cipher_to_alg(group_cipher); 861 if (*alg == WPA_ALG_NONE) { 862 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 863 "WPA: Unsupported Group Cipher %d", 864 group_cipher); 865 return -1; 866 } 867 *key_rsc_len = wpa_cipher_rsc_len(group_cipher); 868 869 klen = wpa_cipher_key_len(group_cipher); 870 if (keylen != klen || maxkeylen < klen) { 871 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 872 "WPA: Unsupported %s Group Cipher key length %d (%d)", 873 wpa_cipher_txt(group_cipher), keylen, maxkeylen); 874 return -1; 875 } 876 return 0; 877 } 878 879 880 struct wpa_gtk_data { 881 enum wpa_alg alg; 882 int tx, key_rsc_len, keyidx; 883 u8 gtk[32]; 884 int gtk_len; 885 }; 886 887 888 static int wpa_supplicant_install_gtk(struct wpa_sm *sm, 889 const struct wpa_gtk_data *gd, 890 const u8 *key_rsc, int wnm_sleep) 891 { 892 const u8 *_gtk = gd->gtk; 893 u8 gtk_buf[32]; 894 895 /* Detect possible key reinstallation */ 896 if ((sm->gtk.gtk_len == (size_t) gd->gtk_len && 897 os_memcmp(sm->gtk.gtk, gd->gtk, sm->gtk.gtk_len) == 0) || 898 (sm->gtk_wnm_sleep.gtk_len == (size_t) gd->gtk_len && 899 os_memcmp(sm->gtk_wnm_sleep.gtk, gd->gtk, 900 sm->gtk_wnm_sleep.gtk_len) == 0)) { 901 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 902 "WPA: Not reinstalling already in-use GTK to the driver (keyidx=%d tx=%d len=%d)", 903 gd->keyidx, gd->tx, gd->gtk_len); 904 return 0; 905 } 906 907 wpa_hexdump_key(MSG_DEBUG, "WPA: Group Key", gd->gtk, gd->gtk_len); 908 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 909 "WPA: Installing GTK to the driver (keyidx=%d tx=%d len=%d)", 910 gd->keyidx, gd->tx, gd->gtk_len); 911 wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, gd->key_rsc_len); 912 if (sm->group_cipher == WPA_CIPHER_TKIP) { 913 /* Swap Tx/Rx keys for Michael MIC */ 914 os_memcpy(gtk_buf, gd->gtk, 16); 915 os_memcpy(gtk_buf + 16, gd->gtk + 24, 8); 916 os_memcpy(gtk_buf + 24, gd->gtk + 16, 8); 917 _gtk = gtk_buf; 918 } 919 if (sm->pairwise_cipher == WPA_CIPHER_NONE) { 920 if (wpa_sm_set_key(sm, gd->alg, NULL, 921 gd->keyidx, 1, key_rsc, gd->key_rsc_len, 922 _gtk, gd->gtk_len) < 0) { 923 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 924 "WPA: Failed to set GTK to the driver " 925 "(Group only)"); 926 forced_memzero(gtk_buf, sizeof(gtk_buf)); 927 return -1; 928 } 929 } else if (wpa_sm_set_key(sm, gd->alg, broadcast_ether_addr, 930 gd->keyidx, gd->tx, key_rsc, gd->key_rsc_len, 931 _gtk, gd->gtk_len) < 0) { 932 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 933 "WPA: Failed to set GTK to " 934 "the driver (alg=%d keylen=%d keyidx=%d)", 935 gd->alg, gd->gtk_len, gd->keyidx); 936 forced_memzero(gtk_buf, sizeof(gtk_buf)); 937 return -1; 938 } 939 forced_memzero(gtk_buf, sizeof(gtk_buf)); 940 941 if (wnm_sleep) { 942 sm->gtk_wnm_sleep.gtk_len = gd->gtk_len; 943 os_memcpy(sm->gtk_wnm_sleep.gtk, gd->gtk, 944 sm->gtk_wnm_sleep.gtk_len); 945 } else { 946 sm->gtk.gtk_len = gd->gtk_len; 947 os_memcpy(sm->gtk.gtk, gd->gtk, sm->gtk.gtk_len); 948 } 949 950 return 0; 951 } 952 953 954 static int wpa_supplicant_gtk_tx_bit_workaround(const struct wpa_sm *sm, 955 int tx) 956 { 957 if (tx && sm->pairwise_cipher != WPA_CIPHER_NONE) { 958 /* Ignore Tx bit for GTK if a pairwise key is used. One AP 959 * seemed to set this bit (incorrectly, since Tx is only when 960 * doing Group Key only APs) and without this workaround, the 961 * data connection does not work because wpa_supplicant 962 * configured non-zero keyidx to be used for unicast. */ 963 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 964 "WPA: Tx bit set for GTK, but pairwise " 965 "keys are used - ignore Tx bit"); 966 return 0; 967 } 968 return tx; 969 } 970 971 972 static int wpa_supplicant_rsc_relaxation(const struct wpa_sm *sm, 973 const u8 *rsc) 974 { 975 int rsclen; 976 977 if (!sm->wpa_rsc_relaxation) 978 return 0; 979 980 rsclen = wpa_cipher_rsc_len(sm->group_cipher); 981 982 /* 983 * Try to detect RSC (endian) corruption issue where the AP sends 984 * the RSC bytes in EAPOL-Key message in the wrong order, both if 985 * it's actually a 6-byte field (as it should be) and if it treats 986 * it as an 8-byte field. 987 * An AP model known to have this bug is the Sapido RB-1632. 988 */ 989 if (rsclen == 6 && ((rsc[5] && !rsc[0]) || rsc[6] || rsc[7])) { 990 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 991 "RSC %02x%02x%02x%02x%02x%02x%02x%02x is likely bogus, using 0", 992 rsc[0], rsc[1], rsc[2], rsc[3], 993 rsc[4], rsc[5], rsc[6], rsc[7]); 994 995 return 1; 996 } 997 998 return 0; 999 } 1000 1001 1002 static int wpa_supplicant_pairwise_gtk(struct wpa_sm *sm, 1003 const struct wpa_eapol_key *key, 1004 const u8 *gtk, size_t gtk_len, 1005 int key_info) 1006 { 1007 struct wpa_gtk_data gd; 1008 const u8 *key_rsc; 1009 1010 /* 1011 * IEEE Std 802.11i-2004 - 8.5.2 EAPOL-Key frames - Figure 43x 1012 * GTK KDE format: 1013 * KeyID[bits 0-1], Tx [bit 2], Reserved [bits 3-7] 1014 * Reserved [bits 0-7] 1015 * GTK 1016 */ 1017 1018 os_memset(&gd, 0, sizeof(gd)); 1019 wpa_hexdump_key(MSG_DEBUG, "RSN: received GTK in pairwise handshake", 1020 gtk, gtk_len); 1021 1022 if (gtk_len < 2 || gtk_len - 2 > sizeof(gd.gtk)) 1023 return -1; 1024 1025 gd.keyidx = gtk[0] & 0x3; 1026 gd.tx = wpa_supplicant_gtk_tx_bit_workaround(sm, 1027 !!(gtk[0] & BIT(2))); 1028 gtk += 2; 1029 gtk_len -= 2; 1030 1031 os_memcpy(gd.gtk, gtk, gtk_len); 1032 gd.gtk_len = gtk_len; 1033 1034 key_rsc = key->key_rsc; 1035 if (wpa_supplicant_rsc_relaxation(sm, key->key_rsc)) 1036 key_rsc = null_rsc; 1037 1038 if (sm->group_cipher != WPA_CIPHER_GTK_NOT_USED && 1039 (wpa_supplicant_check_group_cipher(sm, sm->group_cipher, 1040 gtk_len, gtk_len, 1041 &gd.key_rsc_len, &gd.alg) || 1042 wpa_supplicant_install_gtk(sm, &gd, key_rsc, 0))) { 1043 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1044 "RSN: Failed to install GTK"); 1045 forced_memzero(&gd, sizeof(gd)); 1046 return -1; 1047 } 1048 forced_memzero(&gd, sizeof(gd)); 1049 1050 return 0; 1051 } 1052 1053 1054 #ifdef CONFIG_IEEE80211W 1055 static int wpa_supplicant_install_igtk(struct wpa_sm *sm, 1056 const struct wpa_igtk_kde *igtk, 1057 int wnm_sleep) 1058 { 1059 size_t len = wpa_cipher_key_len(sm->mgmt_group_cipher); 1060 u16 keyidx = WPA_GET_LE16(igtk->keyid); 1061 1062 /* Detect possible key reinstallation */ 1063 if ((sm->igtk.igtk_len == len && 1064 os_memcmp(sm->igtk.igtk, igtk->igtk, sm->igtk.igtk_len) == 0) || 1065 (sm->igtk_wnm_sleep.igtk_len == len && 1066 os_memcmp(sm->igtk_wnm_sleep.igtk, igtk->igtk, 1067 sm->igtk_wnm_sleep.igtk_len) == 0)) { 1068 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1069 "WPA: Not reinstalling already in-use IGTK to the driver (keyidx=%d)", 1070 keyidx); 1071 return 0; 1072 } 1073 1074 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1075 "WPA: IGTK keyid %d pn " COMPACT_MACSTR, 1076 keyidx, MAC2STR(igtk->pn)); 1077 wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK", igtk->igtk, len); 1078 if (keyidx > 4095) { 1079 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1080 "WPA: Invalid IGTK KeyID %d", keyidx); 1081 return -1; 1082 } 1083 if (wpa_sm_set_key(sm, wpa_cipher_to_alg(sm->mgmt_group_cipher), 1084 broadcast_ether_addr, 1085 keyidx, 0, igtk->pn, sizeof(igtk->pn), 1086 igtk->igtk, len) < 0) { 1087 if (keyidx == 0x0400 || keyidx == 0x0500) { 1088 /* Assume the AP has broken PMF implementation since it 1089 * seems to have swapped the KeyID bytes. The AP cannot 1090 * be trusted to implement BIP correctly or provide a 1091 * valid IGTK, so do not try to configure this key with 1092 * swapped KeyID bytes. Instead, continue without 1093 * configuring the IGTK so that the driver can drop any 1094 * received group-addressed robust management frames due 1095 * to missing keys. 1096 * 1097 * Normally, this error behavior would result in us 1098 * disconnecting, but there are number of deployed APs 1099 * with this broken behavior, so as an interoperability 1100 * workaround, allow the connection to proceed. */ 1101 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1102 "WPA: Ignore IGTK configuration error due to invalid IGTK KeyID byte order"); 1103 } else { 1104 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1105 "WPA: Failed to configure IGTK to the driver"); 1106 return -1; 1107 } 1108 } 1109 1110 if (wnm_sleep) { 1111 sm->igtk_wnm_sleep.igtk_len = len; 1112 os_memcpy(sm->igtk_wnm_sleep.igtk, igtk->igtk, 1113 sm->igtk_wnm_sleep.igtk_len); 1114 } else { 1115 sm->igtk.igtk_len = len; 1116 os_memcpy(sm->igtk.igtk, igtk->igtk, sm->igtk.igtk_len); 1117 } 1118 1119 return 0; 1120 } 1121 #endif /* CONFIG_IEEE80211W */ 1122 1123 1124 static int ieee80211w_set_keys(struct wpa_sm *sm, 1125 struct wpa_eapol_ie_parse *ie) 1126 { 1127 #ifdef CONFIG_IEEE80211W 1128 if (!wpa_cipher_valid_mgmt_group(sm->mgmt_group_cipher)) 1129 return 0; 1130 1131 if (ie->igtk) { 1132 size_t len; 1133 const struct wpa_igtk_kde *igtk; 1134 1135 len = wpa_cipher_key_len(sm->mgmt_group_cipher); 1136 if (ie->igtk_len != WPA_IGTK_KDE_PREFIX_LEN + len) 1137 return -1; 1138 1139 igtk = (const struct wpa_igtk_kde *) ie->igtk; 1140 if (wpa_supplicant_install_igtk(sm, igtk, 0) < 0) 1141 return -1; 1142 } 1143 1144 return 0; 1145 #else /* CONFIG_IEEE80211W */ 1146 return 0; 1147 #endif /* CONFIG_IEEE80211W */ 1148 } 1149 1150 1151 static void wpa_report_ie_mismatch(struct wpa_sm *sm, 1152 const char *reason, const u8 *src_addr, 1153 const u8 *wpa_ie, size_t wpa_ie_len, 1154 const u8 *rsn_ie, size_t rsn_ie_len) 1155 { 1156 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "WPA: %s (src=" MACSTR ")", 1157 reason, MAC2STR(src_addr)); 1158 1159 if (sm->ap_wpa_ie) { 1160 wpa_hexdump(MSG_INFO, "WPA: WPA IE in Beacon/ProbeResp", 1161 sm->ap_wpa_ie, sm->ap_wpa_ie_len); 1162 } 1163 if (wpa_ie) { 1164 if (!sm->ap_wpa_ie) { 1165 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1166 "WPA: No WPA IE in Beacon/ProbeResp"); 1167 } 1168 wpa_hexdump(MSG_INFO, "WPA: WPA IE in 3/4 msg", 1169 wpa_ie, wpa_ie_len); 1170 } 1171 1172 if (sm->ap_rsn_ie) { 1173 wpa_hexdump(MSG_INFO, "WPA: RSN IE in Beacon/ProbeResp", 1174 sm->ap_rsn_ie, sm->ap_rsn_ie_len); 1175 } 1176 if (rsn_ie) { 1177 if (!sm->ap_rsn_ie) { 1178 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1179 "WPA: No RSN IE in Beacon/ProbeResp"); 1180 } 1181 wpa_hexdump(MSG_INFO, "WPA: RSN IE in 3/4 msg", 1182 rsn_ie, rsn_ie_len); 1183 } 1184 1185 wpa_sm_deauthenticate(sm, WLAN_REASON_IE_IN_4WAY_DIFFERS); 1186 } 1187 1188 1189 #ifdef CONFIG_IEEE80211R 1190 1191 static int ft_validate_mdie(struct wpa_sm *sm, 1192 const unsigned char *src_addr, 1193 struct wpa_eapol_ie_parse *ie, 1194 const u8 *assoc_resp_mdie) 1195 { 1196 struct rsn_mdie *mdie; 1197 1198 mdie = (struct rsn_mdie *) (ie->mdie + 2); 1199 if (ie->mdie == NULL || ie->mdie_len < 2 + sizeof(*mdie) || 1200 os_memcmp(mdie->mobility_domain, sm->mobility_domain, 1201 MOBILITY_DOMAIN_ID_LEN) != 0) { 1202 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: MDIE in msg 3/4 did " 1203 "not match with the current mobility domain"); 1204 return -1; 1205 } 1206 1207 if (assoc_resp_mdie && 1208 (assoc_resp_mdie[1] != ie->mdie[1] || 1209 os_memcmp(assoc_resp_mdie, ie->mdie, 2 + ie->mdie[1]) != 0)) { 1210 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: MDIE mismatch"); 1211 wpa_hexdump(MSG_DEBUG, "FT: MDIE in EAPOL-Key msg 3/4", 1212 ie->mdie, 2 + ie->mdie[1]); 1213 wpa_hexdump(MSG_DEBUG, "FT: MDIE in (Re)Association Response", 1214 assoc_resp_mdie, 2 + assoc_resp_mdie[1]); 1215 return -1; 1216 } 1217 1218 return 0; 1219 } 1220 1221 1222 static int ft_validate_ftie(struct wpa_sm *sm, 1223 const unsigned char *src_addr, 1224 struct wpa_eapol_ie_parse *ie, 1225 const u8 *assoc_resp_ftie) 1226 { 1227 if (ie->ftie == NULL) { 1228 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1229 "FT: No FTIE in EAPOL-Key msg 3/4"); 1230 return -1; 1231 } 1232 1233 if (assoc_resp_ftie == NULL) 1234 return 0; 1235 1236 if (assoc_resp_ftie[1] != ie->ftie[1] || 1237 os_memcmp(assoc_resp_ftie, ie->ftie, 2 + ie->ftie[1]) != 0) { 1238 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: FTIE mismatch"); 1239 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 3/4", 1240 ie->ftie, 2 + ie->ftie[1]); 1241 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)Association Response", 1242 assoc_resp_ftie, 2 + assoc_resp_ftie[1]); 1243 return -1; 1244 } 1245 1246 return 0; 1247 } 1248 1249 1250 static int ft_validate_rsnie(struct wpa_sm *sm, 1251 const unsigned char *src_addr, 1252 struct wpa_eapol_ie_parse *ie) 1253 { 1254 struct wpa_ie_data rsn; 1255 1256 if (!ie->rsn_ie) 1257 return 0; 1258 1259 /* 1260 * Verify that PMKR1Name from EAPOL-Key message 3/4 1261 * matches with the value we derived. 1262 */ 1263 if (wpa_parse_wpa_ie_rsn(ie->rsn_ie, ie->rsn_ie_len, &rsn) < 0 || 1264 rsn.num_pmkid != 1 || rsn.pmkid == NULL) { 1265 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "FT: No PMKR1Name in " 1266 "FT 4-way handshake message 3/4"); 1267 return -1; 1268 } 1269 1270 if (os_memcmp_const(rsn.pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0) 1271 { 1272 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1273 "FT: PMKR1Name mismatch in " 1274 "FT 4-way handshake message 3/4"); 1275 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Authenticator", 1276 rsn.pmkid, WPA_PMK_NAME_LEN); 1277 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name", 1278 sm->pmk_r1_name, WPA_PMK_NAME_LEN); 1279 return -1; 1280 } 1281 1282 return 0; 1283 } 1284 1285 1286 static int wpa_supplicant_validate_ie_ft(struct wpa_sm *sm, 1287 const unsigned char *src_addr, 1288 struct wpa_eapol_ie_parse *ie) 1289 { 1290 const u8 *pos, *end, *mdie = NULL, *ftie = NULL; 1291 1292 if (sm->assoc_resp_ies) { 1293 pos = sm->assoc_resp_ies; 1294 end = pos + sm->assoc_resp_ies_len; 1295 while (end - pos > 2) { 1296 if (2 + pos[1] > end - pos) 1297 break; 1298 switch (*pos) { 1299 case WLAN_EID_MOBILITY_DOMAIN: 1300 mdie = pos; 1301 break; 1302 case WLAN_EID_FAST_BSS_TRANSITION: 1303 ftie = pos; 1304 break; 1305 } 1306 pos += 2 + pos[1]; 1307 } 1308 } 1309 1310 if (ft_validate_mdie(sm, src_addr, ie, mdie) < 0 || 1311 ft_validate_ftie(sm, src_addr, ie, ftie) < 0 || 1312 ft_validate_rsnie(sm, src_addr, ie) < 0) 1313 return -1; 1314 1315 return 0; 1316 } 1317 1318 #endif /* CONFIG_IEEE80211R */ 1319 1320 1321 static int wpa_supplicant_validate_ie(struct wpa_sm *sm, 1322 const unsigned char *src_addr, 1323 struct wpa_eapol_ie_parse *ie) 1324 { 1325 if (sm->ap_wpa_ie == NULL && sm->ap_rsn_ie == NULL) { 1326 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 1327 "WPA: No WPA/RSN IE for this AP known. " 1328 "Trying to get from scan results"); 1329 if (wpa_sm_get_beacon_ie(sm) < 0) { 1330 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1331 "WPA: Could not find AP from " 1332 "the scan results"); 1333 } else { 1334 wpa_msg(sm->ctx->msg_ctx, MSG_DEBUG, 1335 "WPA: Found the current AP from " 1336 "updated scan results"); 1337 } 1338 } 1339 1340 if (ie->wpa_ie == NULL && ie->rsn_ie == NULL && 1341 (sm->ap_wpa_ie || sm->ap_rsn_ie)) { 1342 wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match " 1343 "with IE in Beacon/ProbeResp (no IE?)", 1344 src_addr, ie->wpa_ie, ie->wpa_ie_len, 1345 ie->rsn_ie, ie->rsn_ie_len); 1346 return -1; 1347 } 1348 1349 if ((ie->wpa_ie && sm->ap_wpa_ie && 1350 (ie->wpa_ie_len != sm->ap_wpa_ie_len || 1351 os_memcmp(ie->wpa_ie, sm->ap_wpa_ie, ie->wpa_ie_len) != 0)) || 1352 (ie->rsn_ie && sm->ap_rsn_ie && 1353 wpa_compare_rsn_ie(wpa_key_mgmt_ft(sm->key_mgmt), 1354 sm->ap_rsn_ie, sm->ap_rsn_ie_len, 1355 ie->rsn_ie, ie->rsn_ie_len))) { 1356 wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match " 1357 "with IE in Beacon/ProbeResp", 1358 src_addr, ie->wpa_ie, ie->wpa_ie_len, 1359 ie->rsn_ie, ie->rsn_ie_len); 1360 return -1; 1361 } 1362 1363 if (sm->proto == WPA_PROTO_WPA && 1364 ie->rsn_ie && sm->ap_rsn_ie == NULL && sm->rsn_enabled) { 1365 wpa_report_ie_mismatch(sm, "Possible downgrade attack " 1366 "detected - RSN was enabled and RSN IE " 1367 "was in msg 3/4, but not in " 1368 "Beacon/ProbeResp", 1369 src_addr, ie->wpa_ie, ie->wpa_ie_len, 1370 ie->rsn_ie, ie->rsn_ie_len); 1371 return -1; 1372 } 1373 1374 #ifdef CONFIG_IEEE80211R 1375 if (wpa_key_mgmt_ft(sm->key_mgmt) && 1376 wpa_supplicant_validate_ie_ft(sm, src_addr, ie) < 0) 1377 return -1; 1378 #endif /* CONFIG_IEEE80211R */ 1379 1380 return 0; 1381 } 1382 1383 1384 /** 1385 * wpa_supplicant_send_4_of_4 - Send message 4 of WPA/RSN 4-Way Handshake 1386 * @sm: Pointer to WPA state machine data from wpa_sm_init() 1387 * @dst: Destination address for the frame 1388 * @key: Pointer to the EAPOL-Key frame header 1389 * @ver: Version bits from EAPOL-Key Key Info 1390 * @key_info: Key Info 1391 * @ptk: PTK to use for keyed hash and encryption 1392 * Returns: >= 0 on success, < 0 on failure 1393 */ 1394 int wpa_supplicant_send_4_of_4(struct wpa_sm *sm, const unsigned char *dst, 1395 const struct wpa_eapol_key *key, 1396 u16 ver, u16 key_info, 1397 struct wpa_ptk *ptk) 1398 { 1399 size_t mic_len, hdrlen, rlen; 1400 struct wpa_eapol_key *reply; 1401 u8 *rbuf, *key_mic; 1402 1403 mic_len = wpa_mic_len(sm->key_mgmt, sm->pmk_len); 1404 hdrlen = sizeof(*reply) + mic_len + 2; 1405 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL, 1406 hdrlen, &rlen, (void *) &reply); 1407 if (rbuf == NULL) 1408 return -1; 1409 1410 reply->type = (sm->proto == WPA_PROTO_RSN || 1411 sm->proto == WPA_PROTO_OSEN) ? 1412 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; 1413 key_info &= WPA_KEY_INFO_SECURE; 1414 key_info |= ver | WPA_KEY_INFO_KEY_TYPE; 1415 if (mic_len) 1416 key_info |= WPA_KEY_INFO_MIC; 1417 else 1418 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA; 1419 WPA_PUT_BE16(reply->key_info, key_info); 1420 if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) 1421 WPA_PUT_BE16(reply->key_length, 0); 1422 else 1423 os_memcpy(reply->key_length, key->key_length, 2); 1424 os_memcpy(reply->replay_counter, key->replay_counter, 1425 WPA_REPLAY_COUNTER_LEN); 1426 1427 key_mic = (u8 *) (reply + 1); 1428 WPA_PUT_BE16(key_mic + mic_len, 0); 1429 1430 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 4/4"); 1431 return wpa_eapol_key_send(sm, ptk, ver, dst, ETH_P_EAPOL, rbuf, rlen, 1432 key_mic); 1433 } 1434 1435 1436 static void wpa_supplicant_process_3_of_4(struct wpa_sm *sm, 1437 const struct wpa_eapol_key *key, 1438 u16 ver, const u8 *key_data, 1439 size_t key_data_len) 1440 { 1441 u16 key_info, keylen; 1442 struct wpa_eapol_ie_parse ie; 1443 1444 wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE); 1445 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: RX message 3 of 4-Way " 1446 "Handshake from " MACSTR " (ver=%d)", MAC2STR(sm->bssid), ver); 1447 1448 key_info = WPA_GET_BE16(key->key_info); 1449 1450 wpa_hexdump(MSG_DEBUG, "WPA: IE KeyData", key_data, key_data_len); 1451 if (wpa_supplicant_parse_ies(key_data, key_data_len, &ie) < 0) 1452 goto failed; 1453 if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) { 1454 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1455 "WPA: GTK IE in unencrypted key data"); 1456 goto failed; 1457 } 1458 #ifdef CONFIG_IEEE80211W 1459 if (ie.igtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) { 1460 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1461 "WPA: IGTK KDE in unencrypted key data"); 1462 goto failed; 1463 } 1464 1465 if (ie.igtk && 1466 wpa_cipher_valid_mgmt_group(sm->mgmt_group_cipher) && 1467 ie.igtk_len != WPA_IGTK_KDE_PREFIX_LEN + 1468 (unsigned int) wpa_cipher_key_len(sm->mgmt_group_cipher)) { 1469 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1470 "WPA: Invalid IGTK KDE length %lu", 1471 (unsigned long) ie.igtk_len); 1472 goto failed; 1473 } 1474 #endif /* CONFIG_IEEE80211W */ 1475 1476 if (wpa_supplicant_validate_ie(sm, sm->bssid, &ie) < 0) 1477 goto failed; 1478 1479 if (os_memcmp(sm->anonce, key->key_nonce, WPA_NONCE_LEN) != 0) { 1480 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1481 "WPA: ANonce from message 1 of 4-Way Handshake " 1482 "differs from 3 of 4-Way Handshake - drop packet (src=" 1483 MACSTR ")", MAC2STR(sm->bssid)); 1484 goto failed; 1485 } 1486 1487 keylen = WPA_GET_BE16(key->key_length); 1488 if (keylen != wpa_cipher_key_len(sm->pairwise_cipher)) { 1489 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1490 "WPA: Invalid %s key length %d (src=" MACSTR 1491 ")", wpa_cipher_txt(sm->pairwise_cipher), keylen, 1492 MAC2STR(sm->bssid)); 1493 goto failed; 1494 } 1495 1496 #ifdef CONFIG_P2P 1497 if (ie.ip_addr_alloc) { 1498 os_memcpy(sm->p2p_ip_addr, ie.ip_addr_alloc, 3 * 4); 1499 wpa_hexdump(MSG_DEBUG, "P2P: IP address info", 1500 sm->p2p_ip_addr, sizeof(sm->p2p_ip_addr)); 1501 } 1502 #endif /* CONFIG_P2P */ 1503 1504 #ifdef CONFIG_OCV 1505 if (wpa_sm_ocv_enabled(sm)) { 1506 struct wpa_channel_info ci; 1507 1508 if (wpa_sm_channel_info(sm, &ci) != 0) { 1509 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1510 "Failed to get channel info to validate received OCI in EAPOL-Key 3/4"); 1511 return; 1512 } 1513 1514 if (ocv_verify_tx_params(ie.oci, ie.oci_len, &ci, 1515 channel_width_to_int(ci.chanwidth), 1516 ci.seg1_idx) != 0) { 1517 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "%s", 1518 ocv_errorstr); 1519 return; 1520 } 1521 } 1522 #endif /* CONFIG_OCV */ 1523 1524 if (wpa_supplicant_send_4_of_4(sm, sm->bssid, key, ver, key_info, 1525 &sm->ptk) < 0) { 1526 goto failed; 1527 } 1528 1529 /* SNonce was successfully used in msg 3/4, so mark it to be renewed 1530 * for the next 4-Way Handshake. If msg 3 is received again, the old 1531 * SNonce will still be used to avoid changing PTK. */ 1532 sm->renew_snonce = 1; 1533 1534 if (key_info & WPA_KEY_INFO_INSTALL) { 1535 if (wpa_supplicant_install_ptk(sm, key)) 1536 goto failed; 1537 } 1538 1539 if (key_info & WPA_KEY_INFO_SECURE) { 1540 wpa_sm_mlme_setprotection( 1541 sm, sm->bssid, MLME_SETPROTECTION_PROTECT_TYPE_RX, 1542 MLME_SETPROTECTION_KEY_TYPE_PAIRWISE); 1543 eapol_sm_notify_portValid(sm->eapol, TRUE); 1544 } 1545 wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE); 1546 1547 if (sm->group_cipher == WPA_CIPHER_GTK_NOT_USED) { 1548 /* No GTK to be set to the driver */ 1549 } else if (!ie.gtk && sm->proto == WPA_PROTO_RSN) { 1550 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1551 "RSN: No GTK KDE included in EAPOL-Key msg 3/4"); 1552 goto failed; 1553 } else if (ie.gtk && 1554 wpa_supplicant_pairwise_gtk(sm, key, 1555 ie.gtk, ie.gtk_len, key_info) < 0) { 1556 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1557 "RSN: Failed to configure GTK"); 1558 goto failed; 1559 } 1560 1561 if (ieee80211w_set_keys(sm, &ie) < 0) { 1562 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1563 "RSN: Failed to configure IGTK"); 1564 goto failed; 1565 } 1566 1567 if (sm->group_cipher == WPA_CIPHER_GTK_NOT_USED || ie.gtk) 1568 wpa_supplicant_key_neg_complete(sm, sm->bssid, 1569 key_info & WPA_KEY_INFO_SECURE); 1570 1571 if (ie.gtk) 1572 wpa_sm_set_rekey_offload(sm); 1573 1574 /* Add PMKSA cache entry for Suite B AKMs here since PMKID can be 1575 * calculated only after KCK has been derived. Though, do not replace an 1576 * existing PMKSA entry after each 4-way handshake (i.e., new KCK/PMKID) 1577 * to avoid unnecessary changes of PMKID while continuing to use the 1578 * same PMK. */ 1579 if (sm->proto == WPA_PROTO_RSN && wpa_key_mgmt_suite_b(sm->key_mgmt) && 1580 !sm->cur_pmksa) { 1581 struct rsn_pmksa_cache_entry *sa; 1582 1583 sa = pmksa_cache_add(sm->pmksa, sm->pmk, sm->pmk_len, NULL, 1584 sm->ptk.kck, sm->ptk.kck_len, 1585 sm->bssid, sm->own_addr, 1586 sm->network_ctx, sm->key_mgmt, NULL); 1587 if (!sm->cur_pmksa) 1588 sm->cur_pmksa = sa; 1589 } 1590 1591 sm->msg_3_of_4_ok = 1; 1592 return; 1593 1594 failed: 1595 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED); 1596 } 1597 1598 1599 static int wpa_supplicant_process_1_of_2_rsn(struct wpa_sm *sm, 1600 const u8 *keydata, 1601 size_t keydatalen, 1602 u16 key_info, 1603 struct wpa_gtk_data *gd) 1604 { 1605 int maxkeylen; 1606 struct wpa_eapol_ie_parse ie; 1607 1608 wpa_hexdump_key(MSG_DEBUG, "RSN: msg 1/2 key data", 1609 keydata, keydatalen); 1610 if (wpa_supplicant_parse_ies(keydata, keydatalen, &ie) < 0) 1611 return -1; 1612 if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) { 1613 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1614 "WPA: GTK IE in unencrypted key data"); 1615 return -1; 1616 } 1617 if (ie.gtk == NULL) { 1618 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1619 "WPA: No GTK IE in Group Key msg 1/2"); 1620 return -1; 1621 } 1622 maxkeylen = gd->gtk_len = ie.gtk_len - 2; 1623 1624 #ifdef CONFIG_OCV 1625 if (wpa_sm_ocv_enabled(sm)) { 1626 struct wpa_channel_info ci; 1627 1628 if (wpa_sm_channel_info(sm, &ci) != 0) { 1629 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1630 "Failed to get channel info to validate received OCI in EAPOL-Key group msg 1/2"); 1631 return -1; 1632 } 1633 1634 if (ocv_verify_tx_params(ie.oci, ie.oci_len, &ci, 1635 channel_width_to_int(ci.chanwidth), 1636 ci.seg1_idx) != 0) { 1637 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "%s", 1638 ocv_errorstr); 1639 return -1; 1640 } 1641 } 1642 #endif /* CONFIG_OCV */ 1643 1644 if (wpa_supplicant_check_group_cipher(sm, sm->group_cipher, 1645 gd->gtk_len, maxkeylen, 1646 &gd->key_rsc_len, &gd->alg)) 1647 return -1; 1648 1649 wpa_hexdump_key(MSG_DEBUG, "RSN: received GTK in group key handshake", 1650 ie.gtk, ie.gtk_len); 1651 gd->keyidx = ie.gtk[0] & 0x3; 1652 gd->tx = wpa_supplicant_gtk_tx_bit_workaround(sm, 1653 !!(ie.gtk[0] & BIT(2))); 1654 if (ie.gtk_len - 2 > sizeof(gd->gtk)) { 1655 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1656 "RSN: Too long GTK in GTK IE (len=%lu)", 1657 (unsigned long) ie.gtk_len - 2); 1658 return -1; 1659 } 1660 os_memcpy(gd->gtk, ie.gtk + 2, ie.gtk_len - 2); 1661 1662 if (ieee80211w_set_keys(sm, &ie) < 0) 1663 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1664 "RSN: Failed to configure IGTK"); 1665 1666 return 0; 1667 } 1668 1669 1670 static int wpa_supplicant_process_1_of_2_wpa(struct wpa_sm *sm, 1671 const struct wpa_eapol_key *key, 1672 const u8 *key_data, 1673 size_t key_data_len, u16 key_info, 1674 u16 ver, struct wpa_gtk_data *gd) 1675 { 1676 size_t maxkeylen; 1677 u16 gtk_len; 1678 1679 gtk_len = WPA_GET_BE16(key->key_length); 1680 maxkeylen = key_data_len; 1681 if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 1682 if (maxkeylen < 8) { 1683 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1684 "WPA: Too short maxkeylen (%lu)", 1685 (unsigned long) maxkeylen); 1686 return -1; 1687 } 1688 maxkeylen -= 8; 1689 } 1690 1691 if (gtk_len > maxkeylen || 1692 wpa_supplicant_check_group_cipher(sm, sm->group_cipher, 1693 gtk_len, maxkeylen, 1694 &gd->key_rsc_len, &gd->alg)) 1695 return -1; 1696 1697 gd->gtk_len = gtk_len; 1698 gd->keyidx = (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >> 1699 WPA_KEY_INFO_KEY_INDEX_SHIFT; 1700 if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 && sm->ptk.kek_len == 16) { 1701 #ifdef CONFIG_NO_RC4 1702 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1703 "WPA: RC4 not supported in the build"); 1704 return -1; 1705 #else /* CONFIG_NO_RC4 */ 1706 u8 ek[32]; 1707 if (key_data_len > sizeof(gd->gtk)) { 1708 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1709 "WPA: RC4 key data too long (%lu)", 1710 (unsigned long) key_data_len); 1711 return -1; 1712 } 1713 os_memcpy(ek, key->key_iv, 16); 1714 os_memcpy(ek + 16, sm->ptk.kek, sm->ptk.kek_len); 1715 os_memcpy(gd->gtk, key_data, key_data_len); 1716 if (rc4_skip(ek, 32, 256, gd->gtk, key_data_len)) { 1717 forced_memzero(ek, sizeof(ek)); 1718 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR, 1719 "WPA: RC4 failed"); 1720 return -1; 1721 } 1722 forced_memzero(ek, sizeof(ek)); 1723 #endif /* CONFIG_NO_RC4 */ 1724 } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 1725 if (maxkeylen % 8) { 1726 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1727 "WPA: Unsupported AES-WRAP len %lu", 1728 (unsigned long) maxkeylen); 1729 return -1; 1730 } 1731 if (maxkeylen > sizeof(gd->gtk)) { 1732 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1733 "WPA: AES-WRAP key data " 1734 "too long (keydatalen=%lu maxkeylen=%lu)", 1735 (unsigned long) key_data_len, 1736 (unsigned long) maxkeylen); 1737 return -1; 1738 } 1739 if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, maxkeylen / 8, 1740 key_data, gd->gtk)) { 1741 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1742 "WPA: AES unwrap failed - could not decrypt " 1743 "GTK"); 1744 return -1; 1745 } 1746 } else { 1747 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1748 "WPA: Unsupported key_info type %d", ver); 1749 return -1; 1750 } 1751 gd->tx = wpa_supplicant_gtk_tx_bit_workaround( 1752 sm, !!(key_info & WPA_KEY_INFO_TXRX)); 1753 return 0; 1754 } 1755 1756 1757 static int wpa_supplicant_send_2_of_2(struct wpa_sm *sm, 1758 const struct wpa_eapol_key *key, 1759 int ver, u16 key_info) 1760 { 1761 size_t mic_len, hdrlen, rlen; 1762 struct wpa_eapol_key *reply; 1763 u8 *rbuf, *key_mic; 1764 size_t kde_len = 0; 1765 1766 #ifdef CONFIG_OCV 1767 if (wpa_sm_ocv_enabled(sm)) 1768 kde_len = OCV_OCI_KDE_LEN; 1769 #endif /* CONFIG_OCV */ 1770 1771 mic_len = wpa_mic_len(sm->key_mgmt, sm->pmk_len); 1772 hdrlen = sizeof(*reply) + mic_len + 2; 1773 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL, 1774 hdrlen + kde_len, &rlen, (void *) &reply); 1775 if (rbuf == NULL) 1776 return -1; 1777 1778 reply->type = (sm->proto == WPA_PROTO_RSN || 1779 sm->proto == WPA_PROTO_OSEN) ? 1780 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; 1781 key_info &= WPA_KEY_INFO_KEY_INDEX_MASK; 1782 key_info |= ver | WPA_KEY_INFO_SECURE; 1783 if (mic_len) 1784 key_info |= WPA_KEY_INFO_MIC; 1785 else 1786 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA; 1787 WPA_PUT_BE16(reply->key_info, key_info); 1788 if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) 1789 WPA_PUT_BE16(reply->key_length, 0); 1790 else 1791 os_memcpy(reply->key_length, key->key_length, 2); 1792 os_memcpy(reply->replay_counter, key->replay_counter, 1793 WPA_REPLAY_COUNTER_LEN); 1794 1795 key_mic = (u8 *) (reply + 1); 1796 WPA_PUT_BE16(key_mic + mic_len, kde_len); /* Key Data Length */ 1797 1798 #ifdef CONFIG_OCV 1799 if (wpa_sm_ocv_enabled(sm)) { 1800 struct wpa_channel_info ci; 1801 u8 *pos; 1802 1803 if (wpa_sm_channel_info(sm, &ci) != 0) { 1804 wpa_printf(MSG_WARNING, 1805 "Failed to get channel info for OCI element in EAPOL-Key 2/2"); 1806 os_free(rbuf); 1807 return -1; 1808 } 1809 1810 pos = key_mic + mic_len + 2; /* Key Data */ 1811 if (ocv_insert_oci_kde(&ci, &pos) < 0) { 1812 os_free(rbuf); 1813 return -1; 1814 } 1815 } 1816 #endif /* CONFIG_OCV */ 1817 1818 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Sending EAPOL-Key 2/2"); 1819 return wpa_eapol_key_send(sm, &sm->ptk, ver, sm->bssid, ETH_P_EAPOL, 1820 rbuf, rlen, key_mic); 1821 } 1822 1823 1824 static void wpa_supplicant_process_1_of_2(struct wpa_sm *sm, 1825 const unsigned char *src_addr, 1826 const struct wpa_eapol_key *key, 1827 const u8 *key_data, 1828 size_t key_data_len, u16 ver) 1829 { 1830 u16 key_info; 1831 int rekey, ret; 1832 struct wpa_gtk_data gd; 1833 const u8 *key_rsc; 1834 1835 if (!sm->msg_3_of_4_ok && !wpa_fils_is_completed(sm)) { 1836 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 1837 "WPA: Group Key Handshake started prior to completion of 4-way handshake"); 1838 goto failed; 1839 } 1840 1841 os_memset(&gd, 0, sizeof(gd)); 1842 1843 rekey = wpa_sm_get_state(sm) == WPA_COMPLETED; 1844 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: RX message 1 of Group Key " 1845 "Handshake from " MACSTR " (ver=%d)", MAC2STR(src_addr), ver); 1846 1847 key_info = WPA_GET_BE16(key->key_info); 1848 1849 if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) { 1850 ret = wpa_supplicant_process_1_of_2_rsn(sm, key_data, 1851 key_data_len, key_info, 1852 &gd); 1853 } else { 1854 ret = wpa_supplicant_process_1_of_2_wpa(sm, key, key_data, 1855 key_data_len, 1856 key_info, ver, &gd); 1857 } 1858 1859 wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE); 1860 1861 if (ret) 1862 goto failed; 1863 1864 key_rsc = key->key_rsc; 1865 if (wpa_supplicant_rsc_relaxation(sm, key->key_rsc)) 1866 key_rsc = null_rsc; 1867 1868 if (wpa_supplicant_install_gtk(sm, &gd, key_rsc, 0) || 1869 wpa_supplicant_send_2_of_2(sm, key, ver, key_info) < 0) 1870 goto failed; 1871 forced_memzero(&gd, sizeof(gd)); 1872 1873 if (rekey) { 1874 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, "WPA: Group rekeying " 1875 "completed with " MACSTR " [GTK=%s]", 1876 MAC2STR(sm->bssid), wpa_cipher_txt(sm->group_cipher)); 1877 wpa_sm_cancel_auth_timeout(sm); 1878 wpa_sm_set_state(sm, WPA_COMPLETED); 1879 } else { 1880 wpa_supplicant_key_neg_complete(sm, sm->bssid, 1881 key_info & 1882 WPA_KEY_INFO_SECURE); 1883 } 1884 1885 wpa_sm_set_rekey_offload(sm); 1886 1887 return; 1888 1889 failed: 1890 forced_memzero(&gd, sizeof(gd)); 1891 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED); 1892 } 1893 1894 1895 static int wpa_supplicant_verify_eapol_key_mic(struct wpa_sm *sm, 1896 struct wpa_eapol_key *key, 1897 u16 ver, 1898 const u8 *buf, size_t len) 1899 { 1900 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN]; 1901 int ok = 0; 1902 size_t mic_len = wpa_mic_len(sm->key_mgmt, sm->pmk_len); 1903 1904 os_memcpy(mic, key + 1, mic_len); 1905 if (sm->tptk_set) { 1906 os_memset(key + 1, 0, mic_len); 1907 if (wpa_eapol_key_mic(sm->tptk.kck, sm->tptk.kck_len, 1908 sm->key_mgmt, 1909 ver, buf, len, (u8 *) (key + 1)) < 0 || 1910 os_memcmp_const(mic, key + 1, mic_len) != 0) { 1911 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1912 "WPA: Invalid EAPOL-Key MIC " 1913 "when using TPTK - ignoring TPTK"); 1914 #ifdef TEST_FUZZ 1915 wpa_printf(MSG_INFO, 1916 "TEST: Ignore Key MIC failure for fuzz testing"); 1917 goto continue_fuzz; 1918 #endif /* TEST_FUZZ */ 1919 } else { 1920 #ifdef TEST_FUZZ 1921 continue_fuzz: 1922 #endif /* TEST_FUZZ */ 1923 ok = 1; 1924 sm->tptk_set = 0; 1925 sm->ptk_set = 1; 1926 os_memcpy(&sm->ptk, &sm->tptk, sizeof(sm->ptk)); 1927 os_memset(&sm->tptk, 0, sizeof(sm->tptk)); 1928 /* 1929 * This assures the same TPTK in sm->tptk can never be 1930 * copied twice to sm->ptk as the new PTK. In 1931 * combination with the installed flag in the wpa_ptk 1932 * struct, this assures the same PTK is only installed 1933 * once. 1934 */ 1935 sm->renew_snonce = 1; 1936 } 1937 } 1938 1939 if (!ok && sm->ptk_set) { 1940 os_memset(key + 1, 0, mic_len); 1941 if (wpa_eapol_key_mic(sm->ptk.kck, sm->ptk.kck_len, 1942 sm->key_mgmt, 1943 ver, buf, len, (u8 *) (key + 1)) < 0 || 1944 os_memcmp_const(mic, key + 1, mic_len) != 0) { 1945 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1946 "WPA: Invalid EAPOL-Key MIC - " 1947 "dropping packet"); 1948 #ifdef TEST_FUZZ 1949 wpa_printf(MSG_INFO, 1950 "TEST: Ignore Key MIC failure for fuzz testing"); 1951 goto continue_fuzz2; 1952 #endif /* TEST_FUZZ */ 1953 return -1; 1954 } 1955 #ifdef TEST_FUZZ 1956 continue_fuzz2: 1957 #endif /* TEST_FUZZ */ 1958 ok = 1; 1959 } 1960 1961 if (!ok) { 1962 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1963 "WPA: Could not verify EAPOL-Key MIC - " 1964 "dropping packet"); 1965 return -1; 1966 } 1967 1968 os_memcpy(sm->rx_replay_counter, key->replay_counter, 1969 WPA_REPLAY_COUNTER_LEN); 1970 sm->rx_replay_counter_set = 1; 1971 return 0; 1972 } 1973 1974 1975 /* Decrypt RSN EAPOL-Key key data (RC4 or AES-WRAP) */ 1976 static int wpa_supplicant_decrypt_key_data(struct wpa_sm *sm, 1977 struct wpa_eapol_key *key, 1978 size_t mic_len, u16 ver, 1979 u8 *key_data, size_t *key_data_len) 1980 { 1981 wpa_hexdump(MSG_DEBUG, "RSN: encrypted key data", 1982 key_data, *key_data_len); 1983 if (!sm->ptk_set) { 1984 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1985 "WPA: PTK not available, cannot decrypt EAPOL-Key Key " 1986 "Data"); 1987 return -1; 1988 } 1989 1990 /* Decrypt key data here so that this operation does not need 1991 * to be implemented separately for each message type. */ 1992 if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 && sm->ptk.kek_len == 16) { 1993 #ifdef CONFIG_NO_RC4 1994 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1995 "WPA: RC4 not supported in the build"); 1996 return -1; 1997 #else /* CONFIG_NO_RC4 */ 1998 u8 ek[32]; 1999 2000 wpa_printf(MSG_DEBUG, "WPA: Decrypt Key Data using RC4"); 2001 os_memcpy(ek, key->key_iv, 16); 2002 os_memcpy(ek + 16, sm->ptk.kek, sm->ptk.kek_len); 2003 if (rc4_skip(ek, 32, 256, key_data, *key_data_len)) { 2004 forced_memzero(ek, sizeof(ek)); 2005 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR, 2006 "WPA: RC4 failed"); 2007 return -1; 2008 } 2009 forced_memzero(ek, sizeof(ek)); 2010 #endif /* CONFIG_NO_RC4 */ 2011 } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES || 2012 ver == WPA_KEY_INFO_TYPE_AES_128_CMAC || 2013 wpa_use_aes_key_wrap(sm->key_mgmt)) { 2014 u8 *buf; 2015 2016 wpa_printf(MSG_DEBUG, 2017 "WPA: Decrypt Key Data using AES-UNWRAP (KEK length %u)", 2018 (unsigned int) sm->ptk.kek_len); 2019 if (*key_data_len < 8 || *key_data_len % 8) { 2020 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 2021 "WPA: Unsupported AES-WRAP len %u", 2022 (unsigned int) *key_data_len); 2023 return -1; 2024 } 2025 *key_data_len -= 8; /* AES-WRAP adds 8 bytes */ 2026 buf = os_malloc(*key_data_len); 2027 if (buf == NULL) { 2028 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 2029 "WPA: No memory for AES-UNWRAP buffer"); 2030 return -1; 2031 } 2032 #ifdef TEST_FUZZ 2033 os_memset(buf, 0x11, *key_data_len); 2034 #endif /* TEST_FUZZ */ 2035 if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, *key_data_len / 8, 2036 key_data, buf)) { 2037 #ifdef TEST_FUZZ 2038 wpa_printf(MSG_INFO, 2039 "TEST: Ignore AES unwrap failure for fuzz testing"); 2040 goto continue_fuzz; 2041 #endif /* TEST_FUZZ */ 2042 bin_clear_free(buf, *key_data_len); 2043 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 2044 "WPA: AES unwrap failed - " 2045 "could not decrypt EAPOL-Key key data"); 2046 return -1; 2047 } 2048 #ifdef TEST_FUZZ 2049 continue_fuzz: 2050 #endif /* TEST_FUZZ */ 2051 os_memcpy(key_data, buf, *key_data_len); 2052 bin_clear_free(buf, *key_data_len); 2053 WPA_PUT_BE16(((u8 *) (key + 1)) + mic_len, *key_data_len); 2054 } else { 2055 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 2056 "WPA: Unsupported key_info type %d", ver); 2057 return -1; 2058 } 2059 wpa_hexdump_key(MSG_DEBUG, "WPA: decrypted EAPOL-Key key data", 2060 key_data, *key_data_len); 2061 return 0; 2062 } 2063 2064 2065 /** 2066 * wpa_sm_aborted_cached - Notify WPA that PMKSA caching was aborted 2067 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2068 */ 2069 void wpa_sm_aborted_cached(struct wpa_sm *sm) 2070 { 2071 if (sm && sm->cur_pmksa) { 2072 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 2073 "RSN: Cancelling PMKSA caching attempt"); 2074 sm->cur_pmksa = NULL; 2075 } 2076 } 2077 2078 2079 static void wpa_eapol_key_dump(struct wpa_sm *sm, 2080 const struct wpa_eapol_key *key, 2081 unsigned int key_data_len, 2082 const u8 *mic, unsigned int mic_len) 2083 { 2084 #ifndef CONFIG_NO_STDOUT_DEBUG 2085 u16 key_info = WPA_GET_BE16(key->key_info); 2086 2087 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, " EAPOL-Key type=%d", key->type); 2088 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 2089 " key_info 0x%x (ver=%d keyidx=%d rsvd=%d %s%s%s%s%s%s%s%s)", 2090 key_info, key_info & WPA_KEY_INFO_TYPE_MASK, 2091 (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >> 2092 WPA_KEY_INFO_KEY_INDEX_SHIFT, 2093 (key_info & (BIT(13) | BIT(14) | BIT(15))) >> 13, 2094 key_info & WPA_KEY_INFO_KEY_TYPE ? "Pairwise" : "Group", 2095 key_info & WPA_KEY_INFO_INSTALL ? " Install" : "", 2096 key_info & WPA_KEY_INFO_ACK ? " Ack" : "", 2097 key_info & WPA_KEY_INFO_MIC ? " MIC" : "", 2098 key_info & WPA_KEY_INFO_SECURE ? " Secure" : "", 2099 key_info & WPA_KEY_INFO_ERROR ? " Error" : "", 2100 key_info & WPA_KEY_INFO_REQUEST ? " Request" : "", 2101 key_info & WPA_KEY_INFO_ENCR_KEY_DATA ? " Encr" : ""); 2102 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 2103 " key_length=%u key_data_length=%u", 2104 WPA_GET_BE16(key->key_length), key_data_len); 2105 wpa_hexdump(MSG_DEBUG, " replay_counter", 2106 key->replay_counter, WPA_REPLAY_COUNTER_LEN); 2107 wpa_hexdump(MSG_DEBUG, " key_nonce", key->key_nonce, WPA_NONCE_LEN); 2108 wpa_hexdump(MSG_DEBUG, " key_iv", key->key_iv, 16); 2109 wpa_hexdump(MSG_DEBUG, " key_rsc", key->key_rsc, 8); 2110 wpa_hexdump(MSG_DEBUG, " key_id (reserved)", key->key_id, 8); 2111 wpa_hexdump(MSG_DEBUG, " key_mic", mic, mic_len); 2112 #endif /* CONFIG_NO_STDOUT_DEBUG */ 2113 } 2114 2115 2116 #ifdef CONFIG_FILS 2117 static int wpa_supp_aead_decrypt(struct wpa_sm *sm, u8 *buf, size_t buf_len, 2118 size_t *key_data_len) 2119 { 2120 struct wpa_ptk *ptk; 2121 struct ieee802_1x_hdr *hdr; 2122 struct wpa_eapol_key *key; 2123 u8 *pos, *tmp; 2124 const u8 *aad[1]; 2125 size_t aad_len[1]; 2126 2127 if (*key_data_len < AES_BLOCK_SIZE) { 2128 wpa_printf(MSG_INFO, "No room for AES-SIV data in the frame"); 2129 return -1; 2130 } 2131 2132 if (sm->tptk_set) 2133 ptk = &sm->tptk; 2134 else if (sm->ptk_set) 2135 ptk = &sm->ptk; 2136 else 2137 return -1; 2138 2139 hdr = (struct ieee802_1x_hdr *) buf; 2140 key = (struct wpa_eapol_key *) (hdr + 1); 2141 pos = (u8 *) (key + 1); 2142 pos += 2; /* Pointing at the Encrypted Key Data field */ 2143 2144 tmp = os_malloc(*key_data_len); 2145 if (!tmp) 2146 return -1; 2147 2148 /* AES-SIV AAD from EAPOL protocol version field (inclusive) to 2149 * to Key Data (exclusive). */ 2150 aad[0] = buf; 2151 aad_len[0] = pos - buf; 2152 if (aes_siv_decrypt(ptk->kek, ptk->kek_len, pos, *key_data_len, 2153 1, aad, aad_len, tmp) < 0) { 2154 wpa_printf(MSG_INFO, "Invalid AES-SIV data in the frame"); 2155 bin_clear_free(tmp, *key_data_len); 2156 return -1; 2157 } 2158 2159 /* AEAD decryption and validation completed successfully */ 2160 (*key_data_len) -= AES_BLOCK_SIZE; 2161 wpa_hexdump_key(MSG_DEBUG, "WPA: Decrypted Key Data", 2162 tmp, *key_data_len); 2163 2164 /* Replace Key Data field with the decrypted version */ 2165 os_memcpy(pos, tmp, *key_data_len); 2166 pos -= 2; /* Key Data Length field */ 2167 WPA_PUT_BE16(pos, *key_data_len); 2168 bin_clear_free(tmp, *key_data_len); 2169 2170 if (sm->tptk_set) { 2171 sm->tptk_set = 0; 2172 sm->ptk_set = 1; 2173 os_memcpy(&sm->ptk, &sm->tptk, sizeof(sm->ptk)); 2174 os_memset(&sm->tptk, 0, sizeof(sm->tptk)); 2175 } 2176 2177 os_memcpy(sm->rx_replay_counter, key->replay_counter, 2178 WPA_REPLAY_COUNTER_LEN); 2179 sm->rx_replay_counter_set = 1; 2180 2181 return 0; 2182 } 2183 #endif /* CONFIG_FILS */ 2184 2185 2186 /** 2187 * wpa_sm_rx_eapol - Process received WPA EAPOL frames 2188 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2189 * @src_addr: Source MAC address of the EAPOL packet 2190 * @buf: Pointer to the beginning of the EAPOL data (EAPOL header) 2191 * @len: Length of the EAPOL frame 2192 * Returns: 1 = WPA EAPOL-Key processed, 0 = not a WPA EAPOL-Key, -1 failure 2193 * 2194 * This function is called for each received EAPOL frame. Other than EAPOL-Key 2195 * frames can be skipped if filtering is done elsewhere. wpa_sm_rx_eapol() is 2196 * only processing WPA and WPA2 EAPOL-Key frames. 2197 * 2198 * The received EAPOL-Key packets are validated and valid packets are replied 2199 * to. In addition, key material (PTK, GTK) is configured at the end of a 2200 * successful key handshake. 2201 */ 2202 int wpa_sm_rx_eapol(struct wpa_sm *sm, const u8 *src_addr, 2203 const u8 *buf, size_t len) 2204 { 2205 size_t plen, data_len, key_data_len; 2206 const struct ieee802_1x_hdr *hdr; 2207 struct wpa_eapol_key *key; 2208 u16 key_info, ver; 2209 u8 *tmp = NULL; 2210 int ret = -1; 2211 u8 *mic, *key_data; 2212 size_t mic_len, keyhdrlen; 2213 2214 #ifdef CONFIG_IEEE80211R 2215 sm->ft_completed = 0; 2216 #endif /* CONFIG_IEEE80211R */ 2217 2218 mic_len = wpa_mic_len(sm->key_mgmt, sm->pmk_len); 2219 keyhdrlen = sizeof(*key) + mic_len + 2; 2220 2221 if (len < sizeof(*hdr) + keyhdrlen) { 2222 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 2223 "WPA: EAPOL frame too short to be a WPA " 2224 "EAPOL-Key (len %lu, expecting at least %lu)", 2225 (unsigned long) len, 2226 (unsigned long) sizeof(*hdr) + keyhdrlen); 2227 return 0; 2228 } 2229 2230 hdr = (const struct ieee802_1x_hdr *) buf; 2231 plen = be_to_host16(hdr->length); 2232 data_len = plen + sizeof(*hdr); 2233 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 2234 "IEEE 802.1X RX: version=%d type=%d length=%lu", 2235 hdr->version, hdr->type, (unsigned long) plen); 2236 2237 if (hdr->version < EAPOL_VERSION) { 2238 /* TODO: backwards compatibility */ 2239 } 2240 if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) { 2241 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 2242 "WPA: EAPOL frame (type %u) discarded, " 2243 "not a Key frame", hdr->type); 2244 ret = 0; 2245 goto out; 2246 } 2247 wpa_hexdump(MSG_MSGDUMP, "WPA: RX EAPOL-Key", buf, len); 2248 if (plen > len - sizeof(*hdr) || plen < keyhdrlen) { 2249 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 2250 "WPA: EAPOL frame payload size %lu " 2251 "invalid (frame size %lu)", 2252 (unsigned long) plen, (unsigned long) len); 2253 ret = 0; 2254 goto out; 2255 } 2256 if (data_len < len) { 2257 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 2258 "WPA: ignoring %lu bytes after the IEEE 802.1X data", 2259 (unsigned long) len - data_len); 2260 } 2261 2262 /* 2263 * Make a copy of the frame since we need to modify the buffer during 2264 * MAC validation and Key Data decryption. 2265 */ 2266 tmp = os_memdup(buf, data_len); 2267 if (tmp == NULL) 2268 goto out; 2269 key = (struct wpa_eapol_key *) (tmp + sizeof(struct ieee802_1x_hdr)); 2270 mic = (u8 *) (key + 1); 2271 key_data = mic + mic_len + 2; 2272 2273 if (key->type != EAPOL_KEY_TYPE_WPA && key->type != EAPOL_KEY_TYPE_RSN) 2274 { 2275 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 2276 "WPA: EAPOL-Key type (%d) unknown, discarded", 2277 key->type); 2278 ret = 0; 2279 goto out; 2280 } 2281 2282 key_data_len = WPA_GET_BE16(mic + mic_len); 2283 wpa_eapol_key_dump(sm, key, key_data_len, mic, mic_len); 2284 2285 if (key_data_len > plen - keyhdrlen) { 2286 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, "WPA: Invalid EAPOL-Key " 2287 "frame - key_data overflow (%u > %u)", 2288 (unsigned int) key_data_len, 2289 (unsigned int) (plen - keyhdrlen)); 2290 goto out; 2291 } 2292 2293 eapol_sm_notify_lower_layer_success(sm->eapol, 0); 2294 key_info = WPA_GET_BE16(key->key_info); 2295 ver = key_info & WPA_KEY_INFO_TYPE_MASK; 2296 if (ver != WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 && 2297 #if defined(CONFIG_IEEE80211R) || defined(CONFIG_IEEE80211W) 2298 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC && 2299 #endif /* CONFIG_IEEE80211R || CONFIG_IEEE80211W */ 2300 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES && 2301 !wpa_use_akm_defined(sm->key_mgmt)) { 2302 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 2303 "WPA: Unsupported EAPOL-Key descriptor version %d", 2304 ver); 2305 goto out; 2306 } 2307 2308 if (wpa_use_akm_defined(sm->key_mgmt) && 2309 ver != WPA_KEY_INFO_TYPE_AKM_DEFINED) { 2310 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 2311 "RSN: Unsupported EAPOL-Key descriptor version %d (expected AKM defined = 0)", 2312 ver); 2313 goto out; 2314 } 2315 2316 #ifdef CONFIG_IEEE80211R 2317 if (wpa_key_mgmt_ft(sm->key_mgmt)) { 2318 /* IEEE 802.11r uses a new key_info type (AES-128-CMAC). */ 2319 if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC && 2320 !wpa_use_akm_defined(sm->key_mgmt)) { 2321 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 2322 "FT: AP did not use AES-128-CMAC"); 2323 goto out; 2324 } 2325 } else 2326 #endif /* CONFIG_IEEE80211R */ 2327 #ifdef CONFIG_IEEE80211W 2328 if (wpa_key_mgmt_sha256(sm->key_mgmt)) { 2329 if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC && 2330 !wpa_use_akm_defined(sm->key_mgmt)) { 2331 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 2332 "WPA: AP did not use the " 2333 "negotiated AES-128-CMAC"); 2334 goto out; 2335 } 2336 } else 2337 #endif /* CONFIG_IEEE80211W */ 2338 if (sm->pairwise_cipher == WPA_CIPHER_CCMP && 2339 !wpa_use_akm_defined(sm->key_mgmt) && 2340 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 2341 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 2342 "WPA: CCMP is used, but EAPOL-Key " 2343 "descriptor version (%d) is not 2", ver); 2344 if (sm->group_cipher != WPA_CIPHER_CCMP && 2345 !(key_info & WPA_KEY_INFO_KEY_TYPE)) { 2346 /* Earlier versions of IEEE 802.11i did not explicitly 2347 * require version 2 descriptor for all EAPOL-Key 2348 * packets, so allow group keys to use version 1 if 2349 * CCMP is not used for them. */ 2350 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 2351 "WPA: Backwards compatibility: allow invalid " 2352 "version for non-CCMP group keys"); 2353 } else if (ver == WPA_KEY_INFO_TYPE_AES_128_CMAC) { 2354 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 2355 "WPA: Interoperability workaround: allow incorrect (should have been HMAC-SHA1), but stronger (is AES-128-CMAC), descriptor version to be used"); 2356 } else 2357 goto out; 2358 } else if (sm->pairwise_cipher == WPA_CIPHER_GCMP && 2359 !wpa_use_akm_defined(sm->key_mgmt) && 2360 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { 2361 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 2362 "WPA: GCMP is used, but EAPOL-Key " 2363 "descriptor version (%d) is not 2", ver); 2364 goto out; 2365 } 2366 2367 if (sm->rx_replay_counter_set && 2368 os_memcmp(key->replay_counter, sm->rx_replay_counter, 2369 WPA_REPLAY_COUNTER_LEN) <= 0) { 2370 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 2371 "WPA: EAPOL-Key Replay Counter did not increase - " 2372 "dropping packet"); 2373 goto out; 2374 } 2375 2376 if (key_info & WPA_KEY_INFO_SMK_MESSAGE) { 2377 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 2378 "WPA: Unsupported SMK bit in key_info"); 2379 goto out; 2380 } 2381 2382 if (!(key_info & WPA_KEY_INFO_ACK)) { 2383 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 2384 "WPA: No Ack bit in key_info"); 2385 goto out; 2386 } 2387 2388 if (key_info & WPA_KEY_INFO_REQUEST) { 2389 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 2390 "WPA: EAPOL-Key with Request bit - dropped"); 2391 goto out; 2392 } 2393 2394 if ((key_info & WPA_KEY_INFO_MIC) && 2395 wpa_supplicant_verify_eapol_key_mic(sm, key, ver, tmp, data_len)) 2396 goto out; 2397 2398 #ifdef CONFIG_FILS 2399 if (!mic_len && (key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) { 2400 if (wpa_supp_aead_decrypt(sm, tmp, data_len, &key_data_len)) 2401 goto out; 2402 } 2403 #endif /* CONFIG_FILS */ 2404 2405 if ((sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) && 2406 (key_info & WPA_KEY_INFO_ENCR_KEY_DATA) && mic_len) { 2407 /* 2408 * Only decrypt the Key Data field if the frame's authenticity 2409 * was verified. When using AES-SIV (FILS), the MIC flag is not 2410 * set, so this check should only be performed if mic_len != 0 2411 * which is the case in this code branch. 2412 */ 2413 if (!(key_info & WPA_KEY_INFO_MIC)) { 2414 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 2415 "WPA: Ignore EAPOL-Key with encrypted but unauthenticated data"); 2416 goto out; 2417 } 2418 if (wpa_supplicant_decrypt_key_data(sm, key, mic_len, 2419 ver, key_data, 2420 &key_data_len)) 2421 goto out; 2422 } 2423 2424 if (key_info & WPA_KEY_INFO_KEY_TYPE) { 2425 if (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) { 2426 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 2427 "WPA: Ignored EAPOL-Key (Pairwise) with " 2428 "non-zero key index"); 2429 goto out; 2430 } 2431 if (key_info & (WPA_KEY_INFO_MIC | 2432 WPA_KEY_INFO_ENCR_KEY_DATA)) { 2433 /* 3/4 4-Way Handshake */ 2434 wpa_supplicant_process_3_of_4(sm, key, ver, key_data, 2435 key_data_len); 2436 } else { 2437 /* 1/4 4-Way Handshake */ 2438 wpa_supplicant_process_1_of_4(sm, src_addr, key, 2439 ver, key_data, 2440 key_data_len); 2441 } 2442 } else { 2443 if ((mic_len && (key_info & WPA_KEY_INFO_MIC)) || 2444 (!mic_len && (key_info & WPA_KEY_INFO_ENCR_KEY_DATA))) { 2445 /* 1/2 Group Key Handshake */ 2446 wpa_supplicant_process_1_of_2(sm, src_addr, key, 2447 key_data, key_data_len, 2448 ver); 2449 } else { 2450 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 2451 "WPA: EAPOL-Key (Group) without Mic/Encr bit - " 2452 "dropped"); 2453 } 2454 } 2455 2456 ret = 1; 2457 2458 out: 2459 bin_clear_free(tmp, data_len); 2460 return ret; 2461 } 2462 2463 2464 #ifdef CONFIG_CTRL_IFACE 2465 static u32 wpa_key_mgmt_suite(struct wpa_sm *sm) 2466 { 2467 switch (sm->key_mgmt) { 2468 case WPA_KEY_MGMT_IEEE8021X: 2469 return ((sm->proto == WPA_PROTO_RSN || 2470 sm->proto == WPA_PROTO_OSEN) ? 2471 RSN_AUTH_KEY_MGMT_UNSPEC_802_1X : 2472 WPA_AUTH_KEY_MGMT_UNSPEC_802_1X); 2473 case WPA_KEY_MGMT_PSK: 2474 return (sm->proto == WPA_PROTO_RSN ? 2475 RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X : 2476 WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X); 2477 #ifdef CONFIG_IEEE80211R 2478 case WPA_KEY_MGMT_FT_IEEE8021X: 2479 return RSN_AUTH_KEY_MGMT_FT_802_1X; 2480 case WPA_KEY_MGMT_FT_PSK: 2481 return RSN_AUTH_KEY_MGMT_FT_PSK; 2482 #endif /* CONFIG_IEEE80211R */ 2483 #ifdef CONFIG_IEEE80211W 2484 case WPA_KEY_MGMT_IEEE8021X_SHA256: 2485 return RSN_AUTH_KEY_MGMT_802_1X_SHA256; 2486 case WPA_KEY_MGMT_PSK_SHA256: 2487 return RSN_AUTH_KEY_MGMT_PSK_SHA256; 2488 #endif /* CONFIG_IEEE80211W */ 2489 case WPA_KEY_MGMT_CCKM: 2490 return (sm->proto == WPA_PROTO_RSN ? 2491 RSN_AUTH_KEY_MGMT_CCKM: 2492 WPA_AUTH_KEY_MGMT_CCKM); 2493 case WPA_KEY_MGMT_WPA_NONE: 2494 return WPA_AUTH_KEY_MGMT_NONE; 2495 case WPA_KEY_MGMT_IEEE8021X_SUITE_B: 2496 return RSN_AUTH_KEY_MGMT_802_1X_SUITE_B; 2497 case WPA_KEY_MGMT_IEEE8021X_SUITE_B_192: 2498 return RSN_AUTH_KEY_MGMT_802_1X_SUITE_B_192; 2499 default: 2500 return 0; 2501 } 2502 } 2503 2504 2505 #define RSN_SUITE "%02x-%02x-%02x-%d" 2506 #define RSN_SUITE_ARG(s) \ 2507 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff 2508 2509 /** 2510 * wpa_sm_get_mib - Dump text list of MIB entries 2511 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2512 * @buf: Buffer for the list 2513 * @buflen: Length of the buffer 2514 * Returns: Number of bytes written to buffer 2515 * 2516 * This function is used fetch dot11 MIB variables. 2517 */ 2518 int wpa_sm_get_mib(struct wpa_sm *sm, char *buf, size_t buflen) 2519 { 2520 char pmkid_txt[PMKID_LEN * 2 + 1]; 2521 int rsna, ret; 2522 size_t len; 2523 2524 if (sm->cur_pmksa) { 2525 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt), 2526 sm->cur_pmksa->pmkid, PMKID_LEN); 2527 } else 2528 pmkid_txt[0] = '\0'; 2529 2530 if ((wpa_key_mgmt_wpa_psk(sm->key_mgmt) || 2531 wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt)) && 2532 sm->proto == WPA_PROTO_RSN) 2533 rsna = 1; 2534 else 2535 rsna = 0; 2536 2537 ret = os_snprintf(buf, buflen, 2538 "dot11RSNAOptionImplemented=TRUE\n" 2539 "dot11RSNAPreauthenticationImplemented=TRUE\n" 2540 "dot11RSNAEnabled=%s\n" 2541 "dot11RSNAPreauthenticationEnabled=%s\n" 2542 "dot11RSNAConfigVersion=%d\n" 2543 "dot11RSNAConfigPairwiseKeysSupported=5\n" 2544 "dot11RSNAConfigGroupCipherSize=%d\n" 2545 "dot11RSNAConfigPMKLifetime=%d\n" 2546 "dot11RSNAConfigPMKReauthThreshold=%d\n" 2547 "dot11RSNAConfigNumberOfPTKSAReplayCounters=1\n" 2548 "dot11RSNAConfigSATimeout=%d\n", 2549 rsna ? "TRUE" : "FALSE", 2550 rsna ? "TRUE" : "FALSE", 2551 RSN_VERSION, 2552 wpa_cipher_key_len(sm->group_cipher) * 8, 2553 sm->dot11RSNAConfigPMKLifetime, 2554 sm->dot11RSNAConfigPMKReauthThreshold, 2555 sm->dot11RSNAConfigSATimeout); 2556 if (os_snprintf_error(buflen, ret)) 2557 return 0; 2558 len = ret; 2559 2560 ret = os_snprintf( 2561 buf + len, buflen - len, 2562 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n" 2563 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n" 2564 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n" 2565 "dot11RSNAPMKIDUsed=%s\n" 2566 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n" 2567 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n" 2568 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n" 2569 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n" 2570 "dot11RSNA4WayHandshakeFailures=%u\n", 2571 RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)), 2572 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto, 2573 sm->pairwise_cipher)), 2574 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto, 2575 sm->group_cipher)), 2576 pmkid_txt, 2577 RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)), 2578 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto, 2579 sm->pairwise_cipher)), 2580 RSN_SUITE_ARG(wpa_cipher_to_suite(sm->proto, 2581 sm->group_cipher)), 2582 sm->dot11RSNA4WayHandshakeFailures); 2583 if (!os_snprintf_error(buflen - len, ret)) 2584 len += ret; 2585 2586 return (int) len; 2587 } 2588 #endif /* CONFIG_CTRL_IFACE */ 2589 2590 2591 static void wpa_sm_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry, 2592 void *ctx, enum pmksa_free_reason reason) 2593 { 2594 struct wpa_sm *sm = ctx; 2595 int deauth = 0; 2596 2597 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "RSN: PMKSA cache entry free_cb: " 2598 MACSTR " reason=%d", MAC2STR(entry->aa), reason); 2599 2600 if (sm->cur_pmksa == entry) { 2601 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 2602 "RSN: %s current PMKSA entry", 2603 reason == PMKSA_REPLACE ? "replaced" : "removed"); 2604 pmksa_cache_clear_current(sm); 2605 2606 /* 2607 * If an entry is simply being replaced, there's no need to 2608 * deauthenticate because it will be immediately re-added. 2609 * This happens when EAP authentication is completed again 2610 * (reauth or failed PMKSA caching attempt). 2611 */ 2612 if (reason != PMKSA_REPLACE) 2613 deauth = 1; 2614 } 2615 2616 if (reason == PMKSA_EXPIRE && 2617 (sm->pmk_len == entry->pmk_len && 2618 os_memcmp(sm->pmk, entry->pmk, sm->pmk_len) == 0)) { 2619 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 2620 "RSN: deauthenticating due to expired PMK"); 2621 pmksa_cache_clear_current(sm); 2622 deauth = 1; 2623 } 2624 2625 if (deauth) { 2626 sm->pmk_len = 0; 2627 os_memset(sm->pmk, 0, sizeof(sm->pmk)); 2628 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED); 2629 } 2630 } 2631 2632 2633 /** 2634 * wpa_sm_init - Initialize WPA state machine 2635 * @ctx: Context pointer for callbacks; this needs to be an allocated buffer 2636 * Returns: Pointer to the allocated WPA state machine data 2637 * 2638 * This function is used to allocate a new WPA state machine and the returned 2639 * value is passed to all WPA state machine calls. 2640 */ 2641 struct wpa_sm * wpa_sm_init(struct wpa_sm_ctx *ctx) 2642 { 2643 struct wpa_sm *sm; 2644 2645 sm = os_zalloc(sizeof(*sm)); 2646 if (sm == NULL) 2647 return NULL; 2648 dl_list_init(&sm->pmksa_candidates); 2649 sm->renew_snonce = 1; 2650 sm->ctx = ctx; 2651 2652 sm->dot11RSNAConfigPMKLifetime = 43200; 2653 sm->dot11RSNAConfigPMKReauthThreshold = 70; 2654 sm->dot11RSNAConfigSATimeout = 60; 2655 2656 sm->pmksa = pmksa_cache_init(wpa_sm_pmksa_free_cb, sm, sm); 2657 if (sm->pmksa == NULL) { 2658 wpa_msg(sm->ctx->msg_ctx, MSG_ERROR, 2659 "RSN: PMKSA cache initialization failed"); 2660 os_free(sm); 2661 return NULL; 2662 } 2663 2664 return sm; 2665 } 2666 2667 2668 /** 2669 * wpa_sm_deinit - Deinitialize WPA state machine 2670 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2671 */ 2672 void wpa_sm_deinit(struct wpa_sm *sm) 2673 { 2674 if (sm == NULL) 2675 return; 2676 pmksa_cache_deinit(sm->pmksa); 2677 eloop_cancel_timeout(wpa_sm_start_preauth, sm, NULL); 2678 eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL); 2679 os_free(sm->assoc_wpa_ie); 2680 os_free(sm->ap_wpa_ie); 2681 os_free(sm->ap_rsn_ie); 2682 wpa_sm_drop_sa(sm); 2683 os_free(sm->ctx); 2684 #ifdef CONFIG_IEEE80211R 2685 os_free(sm->assoc_resp_ies); 2686 #endif /* CONFIG_IEEE80211R */ 2687 #ifdef CONFIG_TESTING_OPTIONS 2688 wpabuf_free(sm->test_assoc_ie); 2689 #endif /* CONFIG_TESTING_OPTIONS */ 2690 #ifdef CONFIG_FILS_SK_PFS 2691 crypto_ecdh_deinit(sm->fils_ecdh); 2692 #endif /* CONFIG_FILS_SK_PFS */ 2693 #ifdef CONFIG_FILS 2694 wpabuf_free(sm->fils_ft_ies); 2695 #endif /* CONFIG_FILS */ 2696 #ifdef CONFIG_OWE 2697 crypto_ecdh_deinit(sm->owe_ecdh); 2698 #endif /* CONFIG_OWE */ 2699 #ifdef CONFIG_DPP2 2700 wpabuf_clear_free(sm->dpp_z); 2701 #endif /* CONFIG_DPP2 */ 2702 os_free(sm); 2703 } 2704 2705 2706 /** 2707 * wpa_sm_notify_assoc - Notify WPA state machine about association 2708 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2709 * @bssid: The BSSID of the new association 2710 * 2711 * This function is called to let WPA state machine know that the connection 2712 * was established. 2713 */ 2714 void wpa_sm_notify_assoc(struct wpa_sm *sm, const u8 *bssid) 2715 { 2716 int clear_keys = 1; 2717 2718 if (sm == NULL) 2719 return; 2720 2721 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 2722 "WPA: Association event - clear replay counter"); 2723 os_memcpy(sm->bssid, bssid, ETH_ALEN); 2724 os_memset(sm->rx_replay_counter, 0, WPA_REPLAY_COUNTER_LEN); 2725 sm->rx_replay_counter_set = 0; 2726 sm->renew_snonce = 1; 2727 if (os_memcmp(sm->preauth_bssid, bssid, ETH_ALEN) == 0) 2728 rsn_preauth_deinit(sm); 2729 2730 #ifdef CONFIG_IEEE80211R 2731 if (wpa_ft_is_completed(sm)) { 2732 /* 2733 * Clear portValid to kick EAPOL state machine to re-enter 2734 * AUTHENTICATED state to get the EAPOL port Authorized. 2735 */ 2736 eapol_sm_notify_portValid(sm->eapol, FALSE); 2737 wpa_supplicant_key_neg_complete(sm, sm->bssid, 1); 2738 2739 /* Prepare for the next transition */ 2740 wpa_ft_prepare_auth_request(sm, NULL); 2741 2742 clear_keys = 0; 2743 sm->ft_protocol = 1; 2744 } else { 2745 sm->ft_protocol = 0; 2746 } 2747 #endif /* CONFIG_IEEE80211R */ 2748 #ifdef CONFIG_FILS 2749 if (sm->fils_completed) { 2750 /* 2751 * Clear portValid to kick EAPOL state machine to re-enter 2752 * AUTHENTICATED state to get the EAPOL port Authorized. 2753 */ 2754 wpa_supplicant_key_neg_complete(sm, sm->bssid, 1); 2755 clear_keys = 0; 2756 } 2757 #endif /* CONFIG_FILS */ 2758 2759 if (clear_keys) { 2760 /* 2761 * IEEE 802.11, 8.4.10: Delete PTK SA on (re)association if 2762 * this is not part of a Fast BSS Transition. 2763 */ 2764 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Clear old PTK"); 2765 sm->ptk_set = 0; 2766 os_memset(&sm->ptk, 0, sizeof(sm->ptk)); 2767 sm->tptk_set = 0; 2768 os_memset(&sm->tptk, 0, sizeof(sm->tptk)); 2769 os_memset(&sm->gtk, 0, sizeof(sm->gtk)); 2770 os_memset(&sm->gtk_wnm_sleep, 0, sizeof(sm->gtk_wnm_sleep)); 2771 #ifdef CONFIG_IEEE80211W 2772 os_memset(&sm->igtk, 0, sizeof(sm->igtk)); 2773 os_memset(&sm->igtk_wnm_sleep, 0, sizeof(sm->igtk_wnm_sleep)); 2774 #endif /* CONFIG_IEEE80211W */ 2775 } 2776 2777 #ifdef CONFIG_TDLS 2778 wpa_tdls_assoc(sm); 2779 #endif /* CONFIG_TDLS */ 2780 2781 #ifdef CONFIG_P2P 2782 os_memset(sm->p2p_ip_addr, 0, sizeof(sm->p2p_ip_addr)); 2783 #endif /* CONFIG_P2P */ 2784 } 2785 2786 2787 /** 2788 * wpa_sm_notify_disassoc - Notify WPA state machine about disassociation 2789 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2790 * 2791 * This function is called to let WPA state machine know that the connection 2792 * was lost. This will abort any existing pre-authentication session. 2793 */ 2794 void wpa_sm_notify_disassoc(struct wpa_sm *sm) 2795 { 2796 eloop_cancel_timeout(wpa_sm_start_preauth, sm, NULL); 2797 eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL); 2798 rsn_preauth_deinit(sm); 2799 pmksa_cache_clear_current(sm); 2800 if (wpa_sm_get_state(sm) == WPA_4WAY_HANDSHAKE) 2801 sm->dot11RSNA4WayHandshakeFailures++; 2802 #ifdef CONFIG_TDLS 2803 wpa_tdls_disassoc(sm); 2804 #endif /* CONFIG_TDLS */ 2805 #ifdef CONFIG_FILS 2806 sm->fils_completed = 0; 2807 #endif /* CONFIG_FILS */ 2808 #ifdef CONFIG_IEEE80211R 2809 sm->ft_reassoc_completed = 0; 2810 sm->ft_protocol = 0; 2811 #endif /* CONFIG_IEEE80211R */ 2812 2813 /* Keys are not needed in the WPA state machine anymore */ 2814 wpa_sm_drop_sa(sm); 2815 2816 sm->msg_3_of_4_ok = 0; 2817 os_memset(sm->bssid, 0, ETH_ALEN); 2818 } 2819 2820 2821 /** 2822 * wpa_sm_set_pmk - Set PMK 2823 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2824 * @pmk: The new PMK 2825 * @pmk_len: The length of the new PMK in bytes 2826 * @pmkid: Calculated PMKID 2827 * @bssid: AA to add into PMKSA cache or %NULL to not cache the PMK 2828 * 2829 * Configure the PMK for WPA state machine. 2830 */ 2831 void wpa_sm_set_pmk(struct wpa_sm *sm, const u8 *pmk, size_t pmk_len, 2832 const u8 *pmkid, const u8 *bssid) 2833 { 2834 if (sm == NULL) 2835 return; 2836 2837 wpa_hexdump_key(MSG_DEBUG, "WPA: Set PMK based on external data", 2838 pmk, pmk_len); 2839 sm->pmk_len = pmk_len; 2840 os_memcpy(sm->pmk, pmk, pmk_len); 2841 2842 #ifdef CONFIG_IEEE80211R 2843 /* Set XXKey to be PSK for FT key derivation */ 2844 sm->xxkey_len = pmk_len; 2845 os_memcpy(sm->xxkey, pmk, pmk_len); 2846 #endif /* CONFIG_IEEE80211R */ 2847 2848 if (bssid) { 2849 pmksa_cache_add(sm->pmksa, pmk, pmk_len, pmkid, NULL, 0, 2850 bssid, sm->own_addr, 2851 sm->network_ctx, sm->key_mgmt, NULL); 2852 } 2853 } 2854 2855 2856 /** 2857 * wpa_sm_set_pmk_from_pmksa - Set PMK based on the current PMKSA 2858 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2859 * 2860 * Take the PMK from the current PMKSA into use. If no PMKSA is active, the PMK 2861 * will be cleared. 2862 */ 2863 void wpa_sm_set_pmk_from_pmksa(struct wpa_sm *sm) 2864 { 2865 if (sm == NULL) 2866 return; 2867 2868 if (sm->cur_pmksa) { 2869 wpa_hexdump_key(MSG_DEBUG, 2870 "WPA: Set PMK based on current PMKSA", 2871 sm->cur_pmksa->pmk, sm->cur_pmksa->pmk_len); 2872 sm->pmk_len = sm->cur_pmksa->pmk_len; 2873 os_memcpy(sm->pmk, sm->cur_pmksa->pmk, sm->pmk_len); 2874 } else { 2875 wpa_printf(MSG_DEBUG, "WPA: No current PMKSA - clear PMK"); 2876 sm->pmk_len = 0; 2877 os_memset(sm->pmk, 0, PMK_LEN_MAX); 2878 } 2879 } 2880 2881 2882 /** 2883 * wpa_sm_set_fast_reauth - Set fast reauthentication (EAP) enabled/disabled 2884 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2885 * @fast_reauth: Whether fast reauthentication (EAP) is allowed 2886 */ 2887 void wpa_sm_set_fast_reauth(struct wpa_sm *sm, int fast_reauth) 2888 { 2889 if (sm) 2890 sm->fast_reauth = fast_reauth; 2891 } 2892 2893 2894 /** 2895 * wpa_sm_set_scard_ctx - Set context pointer for smartcard callbacks 2896 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2897 * @scard_ctx: Context pointer for smartcard related callback functions 2898 */ 2899 void wpa_sm_set_scard_ctx(struct wpa_sm *sm, void *scard_ctx) 2900 { 2901 if (sm == NULL) 2902 return; 2903 sm->scard_ctx = scard_ctx; 2904 if (sm->preauth_eapol) 2905 eapol_sm_register_scard_ctx(sm->preauth_eapol, scard_ctx); 2906 } 2907 2908 2909 /** 2910 * wpa_sm_set_config - Notification of current configration change 2911 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2912 * @config: Pointer to current network configuration 2913 * 2914 * Notify WPA state machine that configuration has changed. config will be 2915 * stored as a backpointer to network configuration. This can be %NULL to clear 2916 * the stored pointed. 2917 */ 2918 void wpa_sm_set_config(struct wpa_sm *sm, struct rsn_supp_config *config) 2919 { 2920 if (!sm) 2921 return; 2922 2923 if (config) { 2924 sm->network_ctx = config->network_ctx; 2925 sm->allowed_pairwise_cipher = config->allowed_pairwise_cipher; 2926 sm->proactive_key_caching = config->proactive_key_caching; 2927 sm->eap_workaround = config->eap_workaround; 2928 sm->eap_conf_ctx = config->eap_conf_ctx; 2929 if (config->ssid) { 2930 os_memcpy(sm->ssid, config->ssid, config->ssid_len); 2931 sm->ssid_len = config->ssid_len; 2932 } else 2933 sm->ssid_len = 0; 2934 sm->wpa_ptk_rekey = config->wpa_ptk_rekey; 2935 sm->p2p = config->p2p; 2936 sm->wpa_rsc_relaxation = config->wpa_rsc_relaxation; 2937 #ifdef CONFIG_FILS 2938 if (config->fils_cache_id) { 2939 sm->fils_cache_id_set = 1; 2940 os_memcpy(sm->fils_cache_id, config->fils_cache_id, 2941 FILS_CACHE_ID_LEN); 2942 } else { 2943 sm->fils_cache_id_set = 0; 2944 } 2945 #endif /* CONFIG_FILS */ 2946 } else { 2947 sm->network_ctx = NULL; 2948 sm->allowed_pairwise_cipher = 0; 2949 sm->proactive_key_caching = 0; 2950 sm->eap_workaround = 0; 2951 sm->eap_conf_ctx = NULL; 2952 sm->ssid_len = 0; 2953 sm->wpa_ptk_rekey = 0; 2954 sm->p2p = 0; 2955 sm->wpa_rsc_relaxation = 0; 2956 } 2957 } 2958 2959 2960 /** 2961 * wpa_sm_set_own_addr - Set own MAC address 2962 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2963 * @addr: Own MAC address 2964 */ 2965 void wpa_sm_set_own_addr(struct wpa_sm *sm, const u8 *addr) 2966 { 2967 if (sm) 2968 os_memcpy(sm->own_addr, addr, ETH_ALEN); 2969 } 2970 2971 2972 /** 2973 * wpa_sm_set_ifname - Set network interface name 2974 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2975 * @ifname: Interface name 2976 * @bridge_ifname: Optional bridge interface name (for pre-auth) 2977 */ 2978 void wpa_sm_set_ifname(struct wpa_sm *sm, const char *ifname, 2979 const char *bridge_ifname) 2980 { 2981 if (sm) { 2982 sm->ifname = ifname; 2983 sm->bridge_ifname = bridge_ifname; 2984 } 2985 } 2986 2987 2988 /** 2989 * wpa_sm_set_eapol - Set EAPOL state machine pointer 2990 * @sm: Pointer to WPA state machine data from wpa_sm_init() 2991 * @eapol: Pointer to EAPOL state machine allocated with eapol_sm_init() 2992 */ 2993 void wpa_sm_set_eapol(struct wpa_sm *sm, struct eapol_sm *eapol) 2994 { 2995 if (sm) 2996 sm->eapol = eapol; 2997 } 2998 2999 3000 /** 3001 * wpa_sm_set_param - Set WPA state machine parameters 3002 * @sm: Pointer to WPA state machine data from wpa_sm_init() 3003 * @param: Parameter field 3004 * @value: Parameter value 3005 * Returns: 0 on success, -1 on failure 3006 */ 3007 int wpa_sm_set_param(struct wpa_sm *sm, enum wpa_sm_conf_params param, 3008 unsigned int value) 3009 { 3010 int ret = 0; 3011 3012 if (sm == NULL) 3013 return -1; 3014 3015 switch (param) { 3016 case RSNA_PMK_LIFETIME: 3017 if (value > 0) 3018 sm->dot11RSNAConfigPMKLifetime = value; 3019 else 3020 ret = -1; 3021 break; 3022 case RSNA_PMK_REAUTH_THRESHOLD: 3023 if (value > 0 && value <= 100) 3024 sm->dot11RSNAConfigPMKReauthThreshold = value; 3025 else 3026 ret = -1; 3027 break; 3028 case RSNA_SA_TIMEOUT: 3029 if (value > 0) 3030 sm->dot11RSNAConfigSATimeout = value; 3031 else 3032 ret = -1; 3033 break; 3034 case WPA_PARAM_PROTO: 3035 sm->proto = value; 3036 break; 3037 case WPA_PARAM_PAIRWISE: 3038 sm->pairwise_cipher = value; 3039 break; 3040 case WPA_PARAM_GROUP: 3041 sm->group_cipher = value; 3042 break; 3043 case WPA_PARAM_KEY_MGMT: 3044 sm->key_mgmt = value; 3045 break; 3046 #ifdef CONFIG_IEEE80211W 3047 case WPA_PARAM_MGMT_GROUP: 3048 sm->mgmt_group_cipher = value; 3049 break; 3050 #endif /* CONFIG_IEEE80211W */ 3051 case WPA_PARAM_RSN_ENABLED: 3052 sm->rsn_enabled = value; 3053 break; 3054 case WPA_PARAM_MFP: 3055 sm->mfp = value; 3056 break; 3057 case WPA_PARAM_OCV: 3058 sm->ocv = value; 3059 break; 3060 default: 3061 break; 3062 } 3063 3064 return ret; 3065 } 3066 3067 3068 /** 3069 * wpa_sm_get_status - Get WPA state machine 3070 * @sm: Pointer to WPA state machine data from wpa_sm_init() 3071 * @buf: Buffer for status information 3072 * @buflen: Maximum buffer length 3073 * @verbose: Whether to include verbose status information 3074 * Returns: Number of bytes written to buf. 3075 * 3076 * Query WPA state machine for status information. This function fills in 3077 * a text area with current status information. If the buffer (buf) is not 3078 * large enough, status information will be truncated to fit the buffer. 3079 */ 3080 int wpa_sm_get_status(struct wpa_sm *sm, char *buf, size_t buflen, 3081 int verbose) 3082 { 3083 char *pos = buf, *end = buf + buflen; 3084 int ret; 3085 3086 ret = os_snprintf(pos, end - pos, 3087 "pairwise_cipher=%s\n" 3088 "group_cipher=%s\n" 3089 "key_mgmt=%s\n", 3090 wpa_cipher_txt(sm->pairwise_cipher), 3091 wpa_cipher_txt(sm->group_cipher), 3092 wpa_key_mgmt_txt(sm->key_mgmt, sm->proto)); 3093 if (os_snprintf_error(end - pos, ret)) 3094 return pos - buf; 3095 pos += ret; 3096 3097 if (sm->mfp != NO_MGMT_FRAME_PROTECTION && sm->ap_rsn_ie) { 3098 struct wpa_ie_data rsn; 3099 if (wpa_parse_wpa_ie_rsn(sm->ap_rsn_ie, sm->ap_rsn_ie_len, &rsn) 3100 >= 0 && 3101 rsn.capabilities & (WPA_CAPABILITY_MFPR | 3102 WPA_CAPABILITY_MFPC)) { 3103 ret = os_snprintf(pos, end - pos, "pmf=%d\n" 3104 "mgmt_group_cipher=%s\n", 3105 (rsn.capabilities & 3106 WPA_CAPABILITY_MFPR) ? 2 : 1, 3107 wpa_cipher_txt( 3108 sm->mgmt_group_cipher)); 3109 if (os_snprintf_error(end - pos, ret)) 3110 return pos - buf; 3111 pos += ret; 3112 } 3113 } 3114 3115 return pos - buf; 3116 } 3117 3118 3119 int wpa_sm_pmf_enabled(struct wpa_sm *sm) 3120 { 3121 struct wpa_ie_data rsn; 3122 3123 if (sm->mfp == NO_MGMT_FRAME_PROTECTION || !sm->ap_rsn_ie) 3124 return 0; 3125 3126 if (wpa_parse_wpa_ie_rsn(sm->ap_rsn_ie, sm->ap_rsn_ie_len, &rsn) >= 0 && 3127 rsn.capabilities & (WPA_CAPABILITY_MFPR | WPA_CAPABILITY_MFPC)) 3128 return 1; 3129 3130 return 0; 3131 } 3132 3133 3134 int wpa_sm_ocv_enabled(struct wpa_sm *sm) 3135 { 3136 struct wpa_ie_data rsn; 3137 3138 if (!sm->ocv || !sm->ap_rsn_ie) 3139 return 0; 3140 3141 return wpa_parse_wpa_ie_rsn(sm->ap_rsn_ie, sm->ap_rsn_ie_len, 3142 &rsn) >= 0 && 3143 (rsn.capabilities & WPA_CAPABILITY_OCVC); 3144 } 3145 3146 3147 /** 3148 * wpa_sm_set_assoc_wpa_ie_default - Generate own WPA/RSN IE from configuration 3149 * @sm: Pointer to WPA state machine data from wpa_sm_init() 3150 * @wpa_ie: Pointer to buffer for WPA/RSN IE 3151 * @wpa_ie_len: Pointer to the length of the wpa_ie buffer 3152 * Returns: 0 on success, -1 on failure 3153 */ 3154 int wpa_sm_set_assoc_wpa_ie_default(struct wpa_sm *sm, u8 *wpa_ie, 3155 size_t *wpa_ie_len) 3156 { 3157 int res; 3158 3159 if (sm == NULL) 3160 return -1; 3161 3162 #ifdef CONFIG_TESTING_OPTIONS 3163 if (sm->test_assoc_ie) { 3164 wpa_printf(MSG_DEBUG, 3165 "TESTING: Replace association WPA/RSN IE"); 3166 if (*wpa_ie_len < wpabuf_len(sm->test_assoc_ie)) 3167 return -1; 3168 os_memcpy(wpa_ie, wpabuf_head(sm->test_assoc_ie), 3169 wpabuf_len(sm->test_assoc_ie)); 3170 res = wpabuf_len(sm->test_assoc_ie); 3171 } else 3172 #endif /* CONFIG_TESTING_OPTIONS */ 3173 res = wpa_gen_wpa_ie(sm, wpa_ie, *wpa_ie_len); 3174 if (res < 0) 3175 return -1; 3176 *wpa_ie_len = res; 3177 3178 wpa_hexdump(MSG_DEBUG, "WPA: Set own WPA IE default", 3179 wpa_ie, *wpa_ie_len); 3180 3181 if (sm->assoc_wpa_ie == NULL) { 3182 /* 3183 * Make a copy of the WPA/RSN IE so that 4-Way Handshake gets 3184 * the correct version of the IE even if PMKSA caching is 3185 * aborted (which would remove PMKID from IE generation). 3186 */ 3187 sm->assoc_wpa_ie = os_memdup(wpa_ie, *wpa_ie_len); 3188 if (sm->assoc_wpa_ie == NULL) 3189 return -1; 3190 3191 sm->assoc_wpa_ie_len = *wpa_ie_len; 3192 } else { 3193 wpa_hexdump(MSG_DEBUG, 3194 "WPA: Leave previously set WPA IE default", 3195 sm->assoc_wpa_ie, sm->assoc_wpa_ie_len); 3196 } 3197 3198 return 0; 3199 } 3200 3201 3202 /** 3203 * wpa_sm_set_assoc_wpa_ie - Set own WPA/RSN IE from (Re)AssocReq 3204 * @sm: Pointer to WPA state machine data from wpa_sm_init() 3205 * @ie: Pointer to IE data (starting from id) 3206 * @len: IE length 3207 * Returns: 0 on success, -1 on failure 3208 * 3209 * Inform WPA state machine about the WPA/RSN IE used in (Re)Association 3210 * Request frame. The IE will be used to override the default value generated 3211 * with wpa_sm_set_assoc_wpa_ie_default(). 3212 */ 3213 int wpa_sm_set_assoc_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len) 3214 { 3215 if (sm == NULL) 3216 return -1; 3217 3218 os_free(sm->assoc_wpa_ie); 3219 if (ie == NULL || len == 0) { 3220 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 3221 "WPA: clearing own WPA/RSN IE"); 3222 sm->assoc_wpa_ie = NULL; 3223 sm->assoc_wpa_ie_len = 0; 3224 } else { 3225 wpa_hexdump(MSG_DEBUG, "WPA: set own WPA/RSN IE", ie, len); 3226 sm->assoc_wpa_ie = os_memdup(ie, len); 3227 if (sm->assoc_wpa_ie == NULL) 3228 return -1; 3229 3230 sm->assoc_wpa_ie_len = len; 3231 } 3232 3233 return 0; 3234 } 3235 3236 3237 /** 3238 * wpa_sm_set_ap_wpa_ie - Set AP WPA IE from Beacon/ProbeResp 3239 * @sm: Pointer to WPA state machine data from wpa_sm_init() 3240 * @ie: Pointer to IE data (starting from id) 3241 * @len: IE length 3242 * Returns: 0 on success, -1 on failure 3243 * 3244 * Inform WPA state machine about the WPA IE used in Beacon / Probe Response 3245 * frame. 3246 */ 3247 int wpa_sm_set_ap_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len) 3248 { 3249 if (sm == NULL) 3250 return -1; 3251 3252 os_free(sm->ap_wpa_ie); 3253 if (ie == NULL || len == 0) { 3254 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 3255 "WPA: clearing AP WPA IE"); 3256 sm->ap_wpa_ie = NULL; 3257 sm->ap_wpa_ie_len = 0; 3258 } else { 3259 wpa_hexdump(MSG_DEBUG, "WPA: set AP WPA IE", ie, len); 3260 sm->ap_wpa_ie = os_memdup(ie, len); 3261 if (sm->ap_wpa_ie == NULL) 3262 return -1; 3263 3264 sm->ap_wpa_ie_len = len; 3265 } 3266 3267 return 0; 3268 } 3269 3270 3271 /** 3272 * wpa_sm_set_ap_rsn_ie - Set AP RSN IE from Beacon/ProbeResp 3273 * @sm: Pointer to WPA state machine data from wpa_sm_init() 3274 * @ie: Pointer to IE data (starting from id) 3275 * @len: IE length 3276 * Returns: 0 on success, -1 on failure 3277 * 3278 * Inform WPA state machine about the RSN IE used in Beacon / Probe Response 3279 * frame. 3280 */ 3281 int wpa_sm_set_ap_rsn_ie(struct wpa_sm *sm, const u8 *ie, size_t len) 3282 { 3283 if (sm == NULL) 3284 return -1; 3285 3286 os_free(sm->ap_rsn_ie); 3287 if (ie == NULL || len == 0) { 3288 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 3289 "WPA: clearing AP RSN IE"); 3290 sm->ap_rsn_ie = NULL; 3291 sm->ap_rsn_ie_len = 0; 3292 } else { 3293 wpa_hexdump(MSG_DEBUG, "WPA: set AP RSN IE", ie, len); 3294 sm->ap_rsn_ie = os_memdup(ie, len); 3295 if (sm->ap_rsn_ie == NULL) 3296 return -1; 3297 3298 sm->ap_rsn_ie_len = len; 3299 } 3300 3301 return 0; 3302 } 3303 3304 3305 /** 3306 * wpa_sm_parse_own_wpa_ie - Parse own WPA/RSN IE 3307 * @sm: Pointer to WPA state machine data from wpa_sm_init() 3308 * @data: Pointer to data area for parsing results 3309 * Returns: 0 on success, -1 if IE is not known, or -2 on parsing failure 3310 * 3311 * Parse the contents of the own WPA or RSN IE from (Re)AssocReq and write the 3312 * parsed data into data. 3313 */ 3314 int wpa_sm_parse_own_wpa_ie(struct wpa_sm *sm, struct wpa_ie_data *data) 3315 { 3316 if (sm == NULL) 3317 return -1; 3318 3319 if (sm->assoc_wpa_ie == NULL) { 3320 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, 3321 "WPA: No WPA/RSN IE available from association info"); 3322 return -1; 3323 } 3324 if (wpa_parse_wpa_ie(sm->assoc_wpa_ie, sm->assoc_wpa_ie_len, data)) 3325 return -2; 3326 return 0; 3327 } 3328 3329 3330 int wpa_sm_pmksa_cache_list(struct wpa_sm *sm, char *buf, size_t len) 3331 { 3332 return pmksa_cache_list(sm->pmksa, buf, len); 3333 } 3334 3335 3336 struct rsn_pmksa_cache_entry * wpa_sm_pmksa_cache_head(struct wpa_sm *sm) 3337 { 3338 return pmksa_cache_head(sm->pmksa); 3339 } 3340 3341 3342 struct rsn_pmksa_cache_entry * 3343 wpa_sm_pmksa_cache_add_entry(struct wpa_sm *sm, 3344 struct rsn_pmksa_cache_entry * entry) 3345 { 3346 return pmksa_cache_add_entry(sm->pmksa, entry); 3347 } 3348 3349 3350 void wpa_sm_pmksa_cache_add(struct wpa_sm *sm, const u8 *pmk, size_t pmk_len, 3351 const u8 *pmkid, const u8 *bssid, 3352 const u8 *fils_cache_id) 3353 { 3354 sm->cur_pmksa = pmksa_cache_add(sm->pmksa, pmk, pmk_len, pmkid, NULL, 0, 3355 bssid, sm->own_addr, sm->network_ctx, 3356 sm->key_mgmt, fils_cache_id); 3357 } 3358 3359 3360 int wpa_sm_pmksa_exists(struct wpa_sm *sm, const u8 *bssid, 3361 const void *network_ctx) 3362 { 3363 return pmksa_cache_get(sm->pmksa, bssid, NULL, network_ctx, 0) != NULL; 3364 } 3365 3366 3367 void wpa_sm_drop_sa(struct wpa_sm *sm) 3368 { 3369 wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: Clear old PMK and PTK"); 3370 sm->ptk_set = 0; 3371 sm->tptk_set = 0; 3372 sm->pmk_len = 0; 3373 os_memset(sm->pmk, 0, sizeof(sm->pmk)); 3374 os_memset(&sm->ptk, 0, sizeof(sm->ptk)); 3375 os_memset(&sm->tptk, 0, sizeof(sm->tptk)); 3376 os_memset(&sm->gtk, 0, sizeof(sm->gtk)); 3377 os_memset(&sm->gtk_wnm_sleep, 0, sizeof(sm->gtk_wnm_sleep)); 3378 #ifdef CONFIG_IEEE80211W 3379 os_memset(&sm->igtk, 0, sizeof(sm->igtk)); 3380 os_memset(&sm->igtk_wnm_sleep, 0, sizeof(sm->igtk_wnm_sleep)); 3381 #endif /* CONFIG_IEEE80211W */ 3382 #ifdef CONFIG_IEEE80211R 3383 os_memset(sm->xxkey, 0, sizeof(sm->xxkey)); 3384 sm->xxkey_len = 0; 3385 os_memset(sm->pmk_r0, 0, sizeof(sm->pmk_r0)); 3386 sm->pmk_r0_len = 0; 3387 os_memset(sm->pmk_r1, 0, sizeof(sm->pmk_r1)); 3388 sm->pmk_r1_len = 0; 3389 #endif /* CONFIG_IEEE80211R */ 3390 } 3391 3392 3393 int wpa_sm_has_ptk(struct wpa_sm *sm) 3394 { 3395 if (sm == NULL) 3396 return 0; 3397 return sm->ptk_set; 3398 } 3399 3400 3401 void wpa_sm_update_replay_ctr(struct wpa_sm *sm, const u8 *replay_ctr) 3402 { 3403 os_memcpy(sm->rx_replay_counter, replay_ctr, WPA_REPLAY_COUNTER_LEN); 3404 } 3405 3406 3407 void wpa_sm_pmksa_cache_flush(struct wpa_sm *sm, void *network_ctx) 3408 { 3409 pmksa_cache_flush(sm->pmksa, network_ctx, NULL, 0); 3410 } 3411 3412 3413 #ifdef CONFIG_WNM 3414 int wpa_wnmsleep_install_key(struct wpa_sm *sm, u8 subelem_id, u8 *buf) 3415 { 3416 u16 keyinfo; 3417 u8 keylen; /* plaintext key len */ 3418 u8 *key_rsc; 3419 3420 if (subelem_id == WNM_SLEEP_SUBELEM_GTK) { 3421 struct wpa_gtk_data gd; 3422 3423 os_memset(&gd, 0, sizeof(gd)); 3424 keylen = wpa_cipher_key_len(sm->group_cipher); 3425 gd.key_rsc_len = wpa_cipher_rsc_len(sm->group_cipher); 3426 gd.alg = wpa_cipher_to_alg(sm->group_cipher); 3427 if (gd.alg == WPA_ALG_NONE) { 3428 wpa_printf(MSG_DEBUG, "Unsupported group cipher suite"); 3429 return -1; 3430 } 3431 3432 key_rsc = buf + 5; 3433 keyinfo = WPA_GET_LE16(buf + 2); 3434 gd.gtk_len = keylen; 3435 if (gd.gtk_len != buf[4]) { 3436 wpa_printf(MSG_DEBUG, "GTK len mismatch len %d vs %d", 3437 gd.gtk_len, buf[4]); 3438 return -1; 3439 } 3440 gd.keyidx = keyinfo & 0x03; /* B0 - B1 */ 3441 gd.tx = wpa_supplicant_gtk_tx_bit_workaround( 3442 sm, !!(keyinfo & WPA_KEY_INFO_TXRX)); 3443 3444 os_memcpy(gd.gtk, buf + 13, gd.gtk_len); 3445 3446 wpa_hexdump_key(MSG_DEBUG, "Install GTK (WNM SLEEP)", 3447 gd.gtk, gd.gtk_len); 3448 if (wpa_supplicant_install_gtk(sm, &gd, key_rsc, 1)) { 3449 forced_memzero(&gd, sizeof(gd)); 3450 wpa_printf(MSG_DEBUG, "Failed to install the GTK in " 3451 "WNM mode"); 3452 return -1; 3453 } 3454 forced_memzero(&gd, sizeof(gd)); 3455 #ifdef CONFIG_IEEE80211W 3456 } else if (subelem_id == WNM_SLEEP_SUBELEM_IGTK) { 3457 const struct wpa_igtk_kde *igtk; 3458 3459 igtk = (const struct wpa_igtk_kde *) (buf + 2); 3460 if (wpa_supplicant_install_igtk(sm, igtk, 1) < 0) 3461 return -1; 3462 #endif /* CONFIG_IEEE80211W */ 3463 } else { 3464 wpa_printf(MSG_DEBUG, "Unknown element id"); 3465 return -1; 3466 } 3467 3468 return 0; 3469 } 3470 #endif /* CONFIG_WNM */ 3471 3472 3473 #ifdef CONFIG_P2P 3474 3475 int wpa_sm_get_p2p_ip_addr(struct wpa_sm *sm, u8 *buf) 3476 { 3477 if (sm == NULL || WPA_GET_BE32(sm->p2p_ip_addr) == 0) 3478 return -1; 3479 os_memcpy(buf, sm->p2p_ip_addr, 3 * 4); 3480 return 0; 3481 } 3482 3483 #endif /* CONFIG_P2P */ 3484 3485 3486 void wpa_sm_set_rx_replay_ctr(struct wpa_sm *sm, const u8 *rx_replay_counter) 3487 { 3488 if (rx_replay_counter == NULL) 3489 return; 3490 3491 os_memcpy(sm->rx_replay_counter, rx_replay_counter, 3492 WPA_REPLAY_COUNTER_LEN); 3493 sm->rx_replay_counter_set = 1; 3494 wpa_printf(MSG_DEBUG, "Updated key replay counter"); 3495 } 3496 3497 3498 void wpa_sm_set_ptk_kck_kek(struct wpa_sm *sm, 3499 const u8 *ptk_kck, size_t ptk_kck_len, 3500 const u8 *ptk_kek, size_t ptk_kek_len) 3501 { 3502 if (ptk_kck && ptk_kck_len <= WPA_KCK_MAX_LEN) { 3503 os_memcpy(sm->ptk.kck, ptk_kck, ptk_kck_len); 3504 sm->ptk.kck_len = ptk_kck_len; 3505 wpa_printf(MSG_DEBUG, "Updated PTK KCK"); 3506 } 3507 if (ptk_kek && ptk_kek_len <= WPA_KEK_MAX_LEN) { 3508 os_memcpy(sm->ptk.kek, ptk_kek, ptk_kek_len); 3509 sm->ptk.kek_len = ptk_kek_len; 3510 wpa_printf(MSG_DEBUG, "Updated PTK KEK"); 3511 } 3512 sm->ptk_set = 1; 3513 } 3514 3515 3516 #ifdef CONFIG_TESTING_OPTIONS 3517 3518 void wpa_sm_set_test_assoc_ie(struct wpa_sm *sm, struct wpabuf *buf) 3519 { 3520 wpabuf_free(sm->test_assoc_ie); 3521 sm->test_assoc_ie = buf; 3522 } 3523 3524 3525 const u8 * wpa_sm_get_anonce(struct wpa_sm *sm) 3526 { 3527 return sm->anonce; 3528 } 3529 3530 #endif /* CONFIG_TESTING_OPTIONS */ 3531 3532 3533 unsigned int wpa_sm_get_key_mgmt(struct wpa_sm *sm) 3534 { 3535 return sm->key_mgmt; 3536 } 3537 3538 3539 #ifdef CONFIG_FILS 3540 3541 struct wpabuf * fils_build_auth(struct wpa_sm *sm, int dh_group, const u8 *md) 3542 { 3543 struct wpabuf *buf = NULL; 3544 struct wpabuf *erp_msg; 3545 struct wpabuf *pub = NULL; 3546 3547 erp_msg = eapol_sm_build_erp_reauth_start(sm->eapol); 3548 if (!erp_msg && !sm->cur_pmksa) { 3549 wpa_printf(MSG_DEBUG, 3550 "FILS: Neither ERP EAP-Initiate/Re-auth nor PMKSA cache entry is available - skip FILS"); 3551 goto fail; 3552 } 3553 3554 wpa_printf(MSG_DEBUG, "FILS: Try to use FILS (erp=%d pmksa_cache=%d)", 3555 erp_msg != NULL, sm->cur_pmksa != NULL); 3556 3557 sm->fils_completed = 0; 3558 3559 if (!sm->assoc_wpa_ie) { 3560 wpa_printf(MSG_INFO, "FILS: No own RSN IE set for FILS"); 3561 goto fail; 3562 } 3563 3564 if (random_get_bytes(sm->fils_nonce, FILS_NONCE_LEN) < 0 || 3565 random_get_bytes(sm->fils_session, FILS_SESSION_LEN) < 0) 3566 goto fail; 3567 3568 wpa_hexdump(MSG_DEBUG, "FILS: Generated FILS Nonce", 3569 sm->fils_nonce, FILS_NONCE_LEN); 3570 wpa_hexdump(MSG_DEBUG, "FILS: Generated FILS Session", 3571 sm->fils_session, FILS_SESSION_LEN); 3572 3573 #ifdef CONFIG_FILS_SK_PFS 3574 sm->fils_dh_group = dh_group; 3575 if (dh_group) { 3576 crypto_ecdh_deinit(sm->fils_ecdh); 3577 sm->fils_ecdh = crypto_ecdh_init(dh_group); 3578 if (!sm->fils_ecdh) { 3579 wpa_printf(MSG_INFO, 3580 "FILS: Could not initialize ECDH with group %d", 3581 dh_group); 3582 goto fail; 3583 } 3584 pub = crypto_ecdh_get_pubkey(sm->fils_ecdh, 1); 3585 if (!pub) 3586 goto fail; 3587 wpa_hexdump_buf(MSG_DEBUG, "FILS: Element (DH public key)", 3588 pub); 3589 sm->fils_dh_elem_len = wpabuf_len(pub); 3590 } 3591 #endif /* CONFIG_FILS_SK_PFS */ 3592 3593 buf = wpabuf_alloc(1000 + sm->assoc_wpa_ie_len + 3594 (pub ? wpabuf_len(pub) : 0)); 3595 if (!buf) 3596 goto fail; 3597 3598 /* Fields following the Authentication algorithm number field */ 3599 3600 /* Authentication Transaction seq# */ 3601 wpabuf_put_le16(buf, 1); 3602 3603 /* Status Code */ 3604 wpabuf_put_le16(buf, WLAN_STATUS_SUCCESS); 3605 3606 /* TODO: FILS PK */ 3607 #ifdef CONFIG_FILS_SK_PFS 3608 if (dh_group) { 3609 /* Finite Cyclic Group */ 3610 wpabuf_put_le16(buf, dh_group); 3611 /* Element */ 3612 wpabuf_put_buf(buf, pub); 3613 } 3614 #endif /* CONFIG_FILS_SK_PFS */ 3615 3616 /* RSNE */ 3617 wpa_hexdump(MSG_DEBUG, "FILS: RSNE in FILS Authentication frame", 3618 sm->assoc_wpa_ie, sm->assoc_wpa_ie_len); 3619 wpabuf_put_data(buf, sm->assoc_wpa_ie, sm->assoc_wpa_ie_len); 3620 3621 if (md) { 3622 /* MDE when using FILS for FT initial association */ 3623 struct rsn_mdie *mdie; 3624 3625 wpabuf_put_u8(buf, WLAN_EID_MOBILITY_DOMAIN); 3626 wpabuf_put_u8(buf, sizeof(*mdie)); 3627 mdie = wpabuf_put(buf, sizeof(*mdie)); 3628 os_memcpy(mdie->mobility_domain, md, MOBILITY_DOMAIN_ID_LEN); 3629 mdie->ft_capab = 0; 3630 } 3631 3632 /* FILS Nonce */ 3633 wpabuf_put_u8(buf, WLAN_EID_EXTENSION); /* Element ID */ 3634 wpabuf_put_u8(buf, 1 + FILS_NONCE_LEN); /* Length */ 3635 /* Element ID Extension */ 3636 wpabuf_put_u8(buf, WLAN_EID_EXT_FILS_NONCE); 3637 wpabuf_put_data(buf, sm->fils_nonce, FILS_NONCE_LEN); 3638 3639 /* FILS Session */ 3640 wpabuf_put_u8(buf, WLAN_EID_EXTENSION); /* Element ID */ 3641 wpabuf_put_u8(buf, 1 + FILS_SESSION_LEN); /* Length */ 3642 /* Element ID Extension */ 3643 wpabuf_put_u8(buf, WLAN_EID_EXT_FILS_SESSION); 3644 wpabuf_put_data(buf, sm->fils_session, FILS_SESSION_LEN); 3645 3646 /* FILS Wrapped Data */ 3647 sm->fils_erp_pmkid_set = 0; 3648 if (erp_msg) { 3649 wpabuf_put_u8(buf, WLAN_EID_EXTENSION); /* Element ID */ 3650 wpabuf_put_u8(buf, 1 + wpabuf_len(erp_msg)); /* Length */ 3651 /* Element ID Extension */ 3652 wpabuf_put_u8(buf, WLAN_EID_EXT_FILS_WRAPPED_DATA); 3653 wpabuf_put_buf(buf, erp_msg); 3654 /* Calculate pending PMKID here so that we do not need to 3655 * maintain a copy of the EAP-Initiate/Reauth message. */ 3656 if (fils_pmkid_erp(sm->key_mgmt, wpabuf_head(erp_msg), 3657 wpabuf_len(erp_msg), 3658 sm->fils_erp_pmkid) == 0) 3659 sm->fils_erp_pmkid_set = 1; 3660 } 3661 3662 wpa_hexdump_buf(MSG_DEBUG, "RSN: FILS fields for Authentication frame", 3663 buf); 3664 3665 fail: 3666 wpabuf_free(erp_msg); 3667 wpabuf_free(pub); 3668 return buf; 3669 } 3670 3671 3672 int fils_process_auth(struct wpa_sm *sm, const u8 *bssid, const u8 *data, 3673 size_t len) 3674 { 3675 const u8 *pos, *end; 3676 struct ieee802_11_elems elems; 3677 struct wpa_ie_data rsn; 3678 int pmkid_match = 0; 3679 u8 ick[FILS_ICK_MAX_LEN]; 3680 size_t ick_len; 3681 int res; 3682 struct wpabuf *dh_ss = NULL; 3683 const u8 *g_sta = NULL; 3684 size_t g_sta_len = 0; 3685 const u8 *g_ap = NULL; 3686 size_t g_ap_len = 0; 3687 struct wpabuf *pub = NULL; 3688 3689 os_memcpy(sm->bssid, bssid, ETH_ALEN); 3690 3691 wpa_hexdump(MSG_DEBUG, "FILS: Authentication frame fields", 3692 data, len); 3693 pos = data; 3694 end = data + len; 3695 3696 /* TODO: FILS PK */ 3697 #ifdef CONFIG_FILS_SK_PFS 3698 if (sm->fils_dh_group) { 3699 u16 group; 3700 3701 /* Using FILS PFS */ 3702 3703 /* Finite Cyclic Group */ 3704 if (end - pos < 2) { 3705 wpa_printf(MSG_DEBUG, 3706 "FILS: No room for Finite Cyclic Group"); 3707 goto fail; 3708 } 3709 group = WPA_GET_LE16(pos); 3710 pos += 2; 3711 if (group != sm->fils_dh_group) { 3712 wpa_printf(MSG_DEBUG, 3713 "FILS: Unexpected change in Finite Cyclic Group: %u (expected %u)", 3714 group, sm->fils_dh_group); 3715 goto fail; 3716 } 3717 3718 /* Element */ 3719 if ((size_t) (end - pos) < sm->fils_dh_elem_len) { 3720 wpa_printf(MSG_DEBUG, "FILS: No room for Element"); 3721 goto fail; 3722 } 3723 3724 if (!sm->fils_ecdh) { 3725 wpa_printf(MSG_DEBUG, "FILS: No ECDH state available"); 3726 goto fail; 3727 } 3728 dh_ss = crypto_ecdh_set_peerkey(sm->fils_ecdh, 1, pos, 3729 sm->fils_dh_elem_len); 3730 if (!dh_ss) { 3731 wpa_printf(MSG_DEBUG, "FILS: ECDH operation failed"); 3732 goto fail; 3733 } 3734 wpa_hexdump_buf_key(MSG_DEBUG, "FILS: DH_SS", dh_ss); 3735 g_ap = pos; 3736 g_ap_len = sm->fils_dh_elem_len; 3737 pos += sm->fils_dh_elem_len; 3738 } 3739 #endif /* CONFIG_FILS_SK_PFS */ 3740 3741 wpa_hexdump(MSG_DEBUG, "FILS: Remaining IEs", pos, end - pos); 3742 if (ieee802_11_parse_elems(pos, end - pos, &elems, 1) == ParseFailed) { 3743 wpa_printf(MSG_DEBUG, "FILS: Could not parse elements"); 3744 goto fail; 3745 } 3746 3747 /* RSNE */ 3748 wpa_hexdump(MSG_DEBUG, "FILS: RSN element", elems.rsn_ie, 3749 elems.rsn_ie_len); 3750 if (!elems.rsn_ie || 3751 wpa_parse_wpa_ie_rsn(elems.rsn_ie - 2, elems.rsn_ie_len + 2, 3752 &rsn) < 0) { 3753 wpa_printf(MSG_DEBUG, "FILS: No RSN element"); 3754 goto fail; 3755 } 3756 3757 if (!elems.fils_nonce) { 3758 wpa_printf(MSG_DEBUG, "FILS: No FILS Nonce field"); 3759 goto fail; 3760 } 3761 os_memcpy(sm->fils_anonce, elems.fils_nonce, FILS_NONCE_LEN); 3762 wpa_hexdump(MSG_DEBUG, "FILS: ANonce", sm->fils_anonce, FILS_NONCE_LEN); 3763 3764 #ifdef CONFIG_IEEE80211R 3765 if (wpa_key_mgmt_ft(sm->key_mgmt)) { 3766 struct wpa_ft_ies parse; 3767 3768 if (!elems.mdie || !elems.ftie) { 3769 wpa_printf(MSG_DEBUG, "FILS+FT: No MDE or FTE"); 3770 goto fail; 3771 } 3772 3773 if (wpa_ft_parse_ies(pos, end - pos, &parse, 3774 wpa_key_mgmt_sha384(sm->key_mgmt)) < 0) { 3775 wpa_printf(MSG_DEBUG, "FILS+FT: Failed to parse IEs"); 3776 goto fail; 3777 } 3778 3779 if (!parse.r0kh_id) { 3780 wpa_printf(MSG_DEBUG, 3781 "FILS+FT: No R0KH-ID subelem in FTE"); 3782 goto fail; 3783 } 3784 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len); 3785 sm->r0kh_id_len = parse.r0kh_id_len; 3786 wpa_hexdump_ascii(MSG_DEBUG, "FILS+FT: R0KH-ID", 3787 sm->r0kh_id, sm->r0kh_id_len); 3788 3789 if (!parse.r1kh_id) { 3790 wpa_printf(MSG_DEBUG, 3791 "FILS+FT: No R1KH-ID subelem in FTE"); 3792 goto fail; 3793 } 3794 os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN); 3795 wpa_hexdump(MSG_DEBUG, "FILS+FT: R1KH-ID", 3796 sm->r1kh_id, FT_R1KH_ID_LEN); 3797 3798 /* TODO: Check MDE and FTE payload */ 3799 3800 wpabuf_free(sm->fils_ft_ies); 3801 sm->fils_ft_ies = wpabuf_alloc(2 + elems.mdie_len + 3802 2 + elems.ftie_len); 3803 if (!sm->fils_ft_ies) 3804 goto fail; 3805 wpabuf_put_data(sm->fils_ft_ies, elems.mdie - 2, 3806 2 + elems.mdie_len); 3807 wpabuf_put_data(sm->fils_ft_ies, elems.ftie - 2, 3808 2 + elems.ftie_len); 3809 } else { 3810 wpabuf_free(sm->fils_ft_ies); 3811 sm->fils_ft_ies = NULL; 3812 } 3813 #endif /* CONFIG_IEEE80211R */ 3814 3815 /* PMKID List */ 3816 if (rsn.pmkid && rsn.num_pmkid > 0) { 3817 wpa_hexdump(MSG_DEBUG, "FILS: PMKID List", 3818 rsn.pmkid, rsn.num_pmkid * PMKID_LEN); 3819 3820 if (rsn.num_pmkid != 1) { 3821 wpa_printf(MSG_DEBUG, "FILS: Invalid PMKID selection"); 3822 goto fail; 3823 } 3824 wpa_hexdump(MSG_DEBUG, "FILS: PMKID", rsn.pmkid, PMKID_LEN); 3825 if (os_memcmp(sm->cur_pmksa->pmkid, rsn.pmkid, PMKID_LEN) != 0) 3826 { 3827 wpa_printf(MSG_DEBUG, "FILS: PMKID mismatch"); 3828 wpa_hexdump(MSG_DEBUG, "FILS: Expected PMKID", 3829 sm->cur_pmksa->pmkid, PMKID_LEN); 3830 goto fail; 3831 } 3832 wpa_printf(MSG_DEBUG, 3833 "FILS: Matching PMKID - continue using PMKSA caching"); 3834 pmkid_match = 1; 3835 } 3836 if (!pmkid_match && sm->cur_pmksa) { 3837 wpa_printf(MSG_DEBUG, 3838 "FILS: No PMKID match - cannot use cached PMKSA entry"); 3839 sm->cur_pmksa = NULL; 3840 } 3841 3842 /* FILS Session */ 3843 if (!elems.fils_session) { 3844 wpa_printf(MSG_DEBUG, "FILS: No FILS Session element"); 3845 goto fail; 3846 } 3847 wpa_hexdump(MSG_DEBUG, "FILS: FILS Session", elems.fils_session, 3848 FILS_SESSION_LEN); 3849 if (os_memcmp(sm->fils_session, elems.fils_session, FILS_SESSION_LEN) 3850 != 0) { 3851 wpa_printf(MSG_DEBUG, "FILS: Session mismatch"); 3852 wpa_hexdump(MSG_DEBUG, "FILS: Expected FILS Session", 3853 sm->fils_session, FILS_SESSION_LEN); 3854 goto fail; 3855 } 3856 3857 /* FILS Wrapped Data */ 3858 if (!sm->cur_pmksa && elems.fils_wrapped_data) { 3859 u8 rmsk[ERP_MAX_KEY_LEN]; 3860 size_t rmsk_len; 3861 3862 wpa_hexdump(MSG_DEBUG, "FILS: Wrapped Data", 3863 elems.fils_wrapped_data, 3864 elems.fils_wrapped_data_len); 3865 eapol_sm_process_erp_finish(sm->eapol, elems.fils_wrapped_data, 3866 elems.fils_wrapped_data_len); 3867 if (eapol_sm_failed(sm->eapol)) 3868 goto fail; 3869 3870 rmsk_len = ERP_MAX_KEY_LEN; 3871 res = eapol_sm_get_key(sm->eapol, rmsk, rmsk_len); 3872 if (res == PMK_LEN) { 3873 rmsk_len = PMK_LEN; 3874 res = eapol_sm_get_key(sm->eapol, rmsk, rmsk_len); 3875 } 3876 if (res) 3877 goto fail; 3878 3879 res = fils_rmsk_to_pmk(sm->key_mgmt, rmsk, rmsk_len, 3880 sm->fils_nonce, sm->fils_anonce, 3881 dh_ss ? wpabuf_head(dh_ss) : NULL, 3882 dh_ss ? wpabuf_len(dh_ss) : 0, 3883 sm->pmk, &sm->pmk_len); 3884 forced_memzero(rmsk, sizeof(rmsk)); 3885 3886 /* Don't use DHss in PTK derivation if PMKSA caching is not 3887 * used. */ 3888 wpabuf_clear_free(dh_ss); 3889 dh_ss = NULL; 3890 3891 if (res) 3892 goto fail; 3893 3894 if (!sm->fils_erp_pmkid_set) { 3895 wpa_printf(MSG_DEBUG, "FILS: PMKID not available"); 3896 goto fail; 3897 } 3898 wpa_hexdump(MSG_DEBUG, "FILS: PMKID", sm->fils_erp_pmkid, 3899 PMKID_LEN); 3900 wpa_printf(MSG_DEBUG, "FILS: ERP processing succeeded - add PMKSA cache entry for the result"); 3901 sm->cur_pmksa = pmksa_cache_add(sm->pmksa, sm->pmk, sm->pmk_len, 3902 sm->fils_erp_pmkid, NULL, 0, 3903 sm->bssid, sm->own_addr, 3904 sm->network_ctx, sm->key_mgmt, 3905 NULL); 3906 } 3907 3908 if (!sm->cur_pmksa) { 3909 wpa_printf(MSG_DEBUG, 3910 "FILS: No remaining options to continue FILS authentication"); 3911 goto fail; 3912 } 3913 3914 if (fils_pmk_to_ptk(sm->pmk, sm->pmk_len, sm->own_addr, sm->bssid, 3915 sm->fils_nonce, sm->fils_anonce, 3916 dh_ss ? wpabuf_head(dh_ss) : NULL, 3917 dh_ss ? wpabuf_len(dh_ss) : 0, 3918 &sm->ptk, ick, &ick_len, 3919 sm->key_mgmt, sm->pairwise_cipher, 3920 sm->fils_ft, &sm->fils_ft_len) < 0) { 3921 wpa_printf(MSG_DEBUG, "FILS: Failed to derive PTK"); 3922 goto fail; 3923 } 3924 3925 wpabuf_clear_free(dh_ss); 3926 dh_ss = NULL; 3927 3928 sm->ptk_set = 1; 3929 sm->tptk_set = 0; 3930 os_memset(&sm->tptk, 0, sizeof(sm->tptk)); 3931 3932 #ifdef CONFIG_FILS_SK_PFS 3933 if (sm->fils_dh_group) { 3934 if (!sm->fils_ecdh) { 3935 wpa_printf(MSG_INFO, "FILS: ECDH not initialized"); 3936 goto fail; 3937 } 3938 pub = crypto_ecdh_get_pubkey(sm->fils_ecdh, 1); 3939 if (!pub) 3940 goto fail; 3941 wpa_hexdump_buf(MSG_DEBUG, "FILS: gSTA", pub); 3942 g_sta = wpabuf_head(pub); 3943 g_sta_len = wpabuf_len(pub); 3944 if (!g_ap) { 3945 wpa_printf(MSG_INFO, "FILS: gAP not available"); 3946 goto fail; 3947 } 3948 wpa_hexdump(MSG_DEBUG, "FILS: gAP", g_ap, g_ap_len); 3949 } 3950 #endif /* CONFIG_FILS_SK_PFS */ 3951 3952 res = fils_key_auth_sk(ick, ick_len, sm->fils_nonce, 3953 sm->fils_anonce, sm->own_addr, sm->bssid, 3954 g_sta, g_sta_len, g_ap, g_ap_len, 3955 sm->key_mgmt, sm->fils_key_auth_sta, 3956 sm->fils_key_auth_ap, 3957 &sm->fils_key_auth_len); 3958 wpabuf_free(pub); 3959 forced_memzero(ick, sizeof(ick)); 3960 return res; 3961 fail: 3962 wpabuf_free(pub); 3963 wpabuf_clear_free(dh_ss); 3964 return -1; 3965 } 3966 3967 3968 #ifdef CONFIG_IEEE80211R 3969 static int fils_ft_build_assoc_req_rsne(struct wpa_sm *sm, struct wpabuf *buf) 3970 { 3971 struct rsn_ie_hdr *rsnie; 3972 u16 capab; 3973 u8 *pos; 3974 int use_sha384 = wpa_key_mgmt_sha384(sm->key_mgmt); 3975 3976 /* RSNIE[PMKR0Name/PMKR1Name] */ 3977 rsnie = wpabuf_put(buf, sizeof(*rsnie)); 3978 rsnie->elem_id = WLAN_EID_RSN; 3979 WPA_PUT_LE16(rsnie->version, RSN_VERSION); 3980 3981 /* Group Suite Selector */ 3982 if (!wpa_cipher_valid_group(sm->group_cipher)) { 3983 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)", 3984 sm->group_cipher); 3985 return -1; 3986 } 3987 pos = wpabuf_put(buf, RSN_SELECTOR_LEN); 3988 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN, 3989 sm->group_cipher)); 3990 3991 /* Pairwise Suite Count */ 3992 wpabuf_put_le16(buf, 1); 3993 3994 /* Pairwise Suite List */ 3995 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) { 3996 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)", 3997 sm->pairwise_cipher); 3998 return -1; 3999 } 4000 pos = wpabuf_put(buf, RSN_SELECTOR_LEN); 4001 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN, 4002 sm->pairwise_cipher)); 4003 4004 /* Authenticated Key Management Suite Count */ 4005 wpabuf_put_le16(buf, 1); 4006 4007 /* Authenticated Key Management Suite List */ 4008 pos = wpabuf_put(buf, RSN_SELECTOR_LEN); 4009 if (sm->key_mgmt == WPA_KEY_MGMT_FT_FILS_SHA256) 4010 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA256); 4011 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_FILS_SHA384) 4012 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA384); 4013 else { 4014 wpa_printf(MSG_WARNING, 4015 "FILS+FT: Invalid key management type (%d)", 4016 sm->key_mgmt); 4017 return -1; 4018 } 4019 4020 /* RSN Capabilities */ 4021 capab = 0; 4022 #ifdef CONFIG_IEEE80211W 4023 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) 4024 capab |= WPA_CAPABILITY_MFPC; 4025 #endif /* CONFIG_IEEE80211W */ 4026 if (sm->ocv) 4027 capab |= WPA_CAPABILITY_OCVC; 4028 wpabuf_put_le16(buf, capab); 4029 4030 /* PMKID Count */ 4031 wpabuf_put_le16(buf, 1); 4032 4033 /* PMKID List [PMKR1Name] */ 4034 wpa_hexdump_key(MSG_DEBUG, "FILS+FT: XXKey (FILS-FT)", 4035 sm->fils_ft, sm->fils_ft_len); 4036 wpa_hexdump_ascii(MSG_DEBUG, "FILS+FT: SSID", sm->ssid, sm->ssid_len); 4037 wpa_hexdump(MSG_DEBUG, "FILS+FT: MDID", 4038 sm->mobility_domain, MOBILITY_DOMAIN_ID_LEN); 4039 wpa_hexdump_ascii(MSG_DEBUG, "FILS+FT: R0KH-ID", 4040 sm->r0kh_id, sm->r0kh_id_len); 4041 if (wpa_derive_pmk_r0(sm->fils_ft, sm->fils_ft_len, sm->ssid, 4042 sm->ssid_len, sm->mobility_domain, 4043 sm->r0kh_id, sm->r0kh_id_len, sm->own_addr, 4044 sm->pmk_r0, sm->pmk_r0_name, use_sha384) < 0) { 4045 wpa_printf(MSG_WARNING, "FILS+FT: Could not derive PMK-R0"); 4046 return -1; 4047 } 4048 sm->pmk_r0_len = use_sha384 ? SHA384_MAC_LEN : PMK_LEN; 4049 wpa_hexdump_key(MSG_DEBUG, "FILS+FT: PMK-R0", 4050 sm->pmk_r0, sm->pmk_r0_len); 4051 wpa_hexdump(MSG_DEBUG, "FILS+FT: PMKR0Name", 4052 sm->pmk_r0_name, WPA_PMK_NAME_LEN); 4053 wpa_printf(MSG_DEBUG, "FILS+FT: R1KH-ID: " MACSTR, 4054 MAC2STR(sm->r1kh_id)); 4055 pos = wpabuf_put(buf, WPA_PMK_NAME_LEN); 4056 if (wpa_derive_pmk_r1_name(sm->pmk_r0_name, sm->r1kh_id, sm->own_addr, 4057 sm->pmk_r1_name, use_sha384) < 0) { 4058 wpa_printf(MSG_WARNING, "FILS+FT: Could not derive PMKR1Name"); 4059 return -1; 4060 } 4061 wpa_hexdump(MSG_DEBUG, "FILS+FT: PMKR1Name", sm->pmk_r1_name, 4062 WPA_PMK_NAME_LEN); 4063 os_memcpy(pos, sm->pmk_r1_name, WPA_PMK_NAME_LEN); 4064 4065 #ifdef CONFIG_IEEE80211W 4066 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) { 4067 /* Management Group Cipher Suite */ 4068 pos = wpabuf_put(buf, RSN_SELECTOR_LEN); 4069 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC); 4070 } 4071 #endif /* CONFIG_IEEE80211W */ 4072 4073 rsnie->len = ((u8 *) wpabuf_put(buf, 0) - (u8 *) rsnie) - 2; 4074 return 0; 4075 } 4076 #endif /* CONFIG_IEEE80211R */ 4077 4078 4079 struct wpabuf * fils_build_assoc_req(struct wpa_sm *sm, const u8 **kek, 4080 size_t *kek_len, const u8 **snonce, 4081 const u8 **anonce, 4082 const struct wpabuf **hlp, 4083 unsigned int num_hlp) 4084 { 4085 struct wpabuf *buf; 4086 size_t len; 4087 unsigned int i; 4088 4089 len = 1000; 4090 #ifdef CONFIG_IEEE80211R 4091 if (sm->fils_ft_ies) 4092 len += wpabuf_len(sm->fils_ft_ies); 4093 if (wpa_key_mgmt_ft(sm->key_mgmt)) 4094 len += 256; 4095 #endif /* CONFIG_IEEE80211R */ 4096 for (i = 0; hlp && i < num_hlp; i++) 4097 len += 10 + wpabuf_len(hlp[i]); 4098 buf = wpabuf_alloc(len); 4099 if (!buf) 4100 return NULL; 4101 4102 #ifdef CONFIG_IEEE80211R 4103 if (wpa_key_mgmt_ft(sm->key_mgmt) && sm->fils_ft_ies) { 4104 /* MDE and FTE when using FILS+FT */ 4105 wpabuf_put_buf(buf, sm->fils_ft_ies); 4106 /* RSNE with PMKR1Name in PMKID field */ 4107 if (fils_ft_build_assoc_req_rsne(sm, buf) < 0) { 4108 wpabuf_free(buf); 4109 return NULL; 4110 } 4111 } 4112 #endif /* CONFIG_IEEE80211R */ 4113 4114 /* FILS Session */ 4115 wpabuf_put_u8(buf, WLAN_EID_EXTENSION); /* Element ID */ 4116 wpabuf_put_u8(buf, 1 + FILS_SESSION_LEN); /* Length */ 4117 /* Element ID Extension */ 4118 wpabuf_put_u8(buf, WLAN_EID_EXT_FILS_SESSION); 4119 wpabuf_put_data(buf, sm->fils_session, FILS_SESSION_LEN); 4120 4121 /* Everything after FILS Session element gets encrypted in the driver 4122 * with KEK. The buffer returned from here is the plaintext version. */ 4123 4124 /* TODO: FILS Public Key */ 4125 4126 /* FILS Key Confirm */ 4127 wpabuf_put_u8(buf, WLAN_EID_EXTENSION); /* Element ID */ 4128 wpabuf_put_u8(buf, 1 + sm->fils_key_auth_len); /* Length */ 4129 /* Element ID Extension */ 4130 wpabuf_put_u8(buf, WLAN_EID_EXT_FILS_KEY_CONFIRM); 4131 wpabuf_put_data(buf, sm->fils_key_auth_sta, sm->fils_key_auth_len); 4132 4133 /* FILS HLP Container */ 4134 for (i = 0; hlp && i < num_hlp; i++) { 4135 const u8 *pos = wpabuf_head(hlp[i]); 4136 size_t left = wpabuf_len(hlp[i]); 4137 4138 wpabuf_put_u8(buf, WLAN_EID_EXTENSION); /* Element ID */ 4139 if (left <= 254) 4140 len = 1 + left; 4141 else 4142 len = 255; 4143 wpabuf_put_u8(buf, len); /* Length */ 4144 /* Element ID Extension */ 4145 wpabuf_put_u8(buf, WLAN_EID_EXT_FILS_HLP_CONTAINER); 4146 /* Destination MAC Address, Source MAC Address, HLP Packet. 4147 * HLP Packet is in MSDU format (i.e., included the LLC/SNAP 4148 * header when LPD is used). */ 4149 wpabuf_put_data(buf, pos, len - 1); 4150 pos += len - 1; 4151 left -= len - 1; 4152 while (left) { 4153 wpabuf_put_u8(buf, WLAN_EID_FRAGMENT); 4154 len = left > 255 ? 255 : left; 4155 wpabuf_put_u8(buf, len); 4156 wpabuf_put_data(buf, pos, len); 4157 pos += len; 4158 left -= len; 4159 } 4160 } 4161 4162 /* TODO: FILS IP Address Assignment */ 4163 4164 #ifdef CONFIG_OCV 4165 if (wpa_sm_ocv_enabled(sm)) { 4166 struct wpa_channel_info ci; 4167 u8 *pos; 4168 4169 if (wpa_sm_channel_info(sm, &ci) != 0) { 4170 wpa_printf(MSG_WARNING, 4171 "FILS: Failed to get channel info for OCI element"); 4172 wpabuf_free(buf); 4173 return NULL; 4174 } 4175 4176 pos = wpabuf_put(buf, OCV_OCI_EXTENDED_LEN); 4177 if (ocv_insert_extended_oci(&ci, pos) < 0) { 4178 wpabuf_free(buf); 4179 return NULL; 4180 } 4181 } 4182 #endif /* CONFIG_OCV */ 4183 4184 wpa_hexdump_buf(MSG_DEBUG, "FILS: Association Request plaintext", buf); 4185 4186 *kek = sm->ptk.kek; 4187 *kek_len = sm->ptk.kek_len; 4188 wpa_hexdump_key(MSG_DEBUG, "FILS: KEK for AEAD", *kek, *kek_len); 4189 *snonce = sm->fils_nonce; 4190 wpa_hexdump(MSG_DEBUG, "FILS: SNonce for AEAD AAD", 4191 *snonce, FILS_NONCE_LEN); 4192 *anonce = sm->fils_anonce; 4193 wpa_hexdump(MSG_DEBUG, "FILS: ANonce for AEAD AAD", 4194 *anonce, FILS_NONCE_LEN); 4195 4196 return buf; 4197 } 4198 4199 4200 static void fils_process_hlp_resp(struct wpa_sm *sm, const u8 *resp, size_t len) 4201 { 4202 const u8 *pos, *end; 4203 4204 wpa_hexdump(MSG_MSGDUMP, "FILS: HLP response", resp, len); 4205 if (len < 2 * ETH_ALEN) 4206 return; 4207 pos = resp + 2 * ETH_ALEN; 4208 end = resp + len; 4209 if (end - pos >= 6 && 4210 os_memcmp(pos, "\xaa\xaa\x03\x00\x00\x00", 6) == 0) 4211 pos += 6; /* Remove SNAP/LLC header */ 4212 wpa_sm_fils_hlp_rx(sm, resp, resp + ETH_ALEN, pos, end - pos); 4213 } 4214 4215 4216 static void fils_process_hlp_container(struct wpa_sm *sm, const u8 *pos, 4217 size_t len) 4218 { 4219 const u8 *end = pos + len; 4220 u8 *tmp, *tmp_pos; 4221 4222 /* Check if there are any FILS HLP Container elements */ 4223 while (end - pos >= 2) { 4224 if (2 + pos[1] > end - pos) 4225 return; 4226 if (pos[0] == WLAN_EID_EXTENSION && 4227 pos[1] >= 1 + 2 * ETH_ALEN && 4228 pos[2] == WLAN_EID_EXT_FILS_HLP_CONTAINER) 4229 break; 4230 pos += 2 + pos[1]; 4231 } 4232 if (end - pos < 2) 4233 return; /* No FILS HLP Container elements */ 4234 4235 tmp = os_malloc(end - pos); 4236 if (!tmp) 4237 return; 4238 4239 while (end - pos >= 2) { 4240 if (2 + pos[1] > end - pos || 4241 pos[0] != WLAN_EID_EXTENSION || 4242 pos[1] < 1 + 2 * ETH_ALEN || 4243 pos[2] != WLAN_EID_EXT_FILS_HLP_CONTAINER) 4244 break; 4245 tmp_pos = tmp; 4246 os_memcpy(tmp_pos, pos + 3, pos[1] - 1); 4247 tmp_pos += pos[1] - 1; 4248 pos += 2 + pos[1]; 4249 4250 /* Add possible fragments */ 4251 while (end - pos >= 2 && pos[0] == WLAN_EID_FRAGMENT && 4252 2 + pos[1] <= end - pos) { 4253 os_memcpy(tmp_pos, pos + 2, pos[1]); 4254 tmp_pos += pos[1]; 4255 pos += 2 + pos[1]; 4256 } 4257 4258 fils_process_hlp_resp(sm, tmp, tmp_pos - tmp); 4259 } 4260 4261 os_free(tmp); 4262 } 4263 4264 4265 int fils_process_assoc_resp(struct wpa_sm *sm, const u8 *resp, size_t len) 4266 { 4267 const struct ieee80211_mgmt *mgmt; 4268 const u8 *end, *ie_start; 4269 struct ieee802_11_elems elems; 4270 int keylen, rsclen; 4271 enum wpa_alg alg; 4272 struct wpa_gtk_data gd; 4273 int maxkeylen; 4274 struct wpa_eapol_ie_parse kde; 4275 4276 if (!sm || !sm->ptk_set) { 4277 wpa_printf(MSG_DEBUG, "FILS: No KEK available"); 4278 return -1; 4279 } 4280 4281 if (!wpa_key_mgmt_fils(sm->key_mgmt)) { 4282 wpa_printf(MSG_DEBUG, "FILS: Not a FILS AKM"); 4283 return -1; 4284 } 4285 4286 if (sm->fils_completed) { 4287 wpa_printf(MSG_DEBUG, 4288 "FILS: Association has already been completed for this FILS authentication - ignore unexpected retransmission"); 4289 return -1; 4290 } 4291 4292 wpa_hexdump(MSG_DEBUG, "FILS: (Re)Association Response frame", 4293 resp, len); 4294 4295 mgmt = (const struct ieee80211_mgmt *) resp; 4296 if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.assoc_resp)) 4297 return -1; 4298 4299 end = resp + len; 4300 /* Same offset for Association Response and Reassociation Response */ 4301 ie_start = mgmt->u.assoc_resp.variable; 4302 4303 if (ieee802_11_parse_elems(ie_start, end - ie_start, &elems, 1) == 4304 ParseFailed) { 4305 wpa_printf(MSG_DEBUG, 4306 "FILS: Failed to parse decrypted elements"); 4307 goto fail; 4308 } 4309 4310 if (!elems.fils_session) { 4311 wpa_printf(MSG_DEBUG, "FILS: No FILS Session element"); 4312 return -1; 4313 } 4314 if (os_memcmp(elems.fils_session, sm->fils_session, 4315 FILS_SESSION_LEN) != 0) { 4316 wpa_printf(MSG_DEBUG, "FILS: FILS Session mismatch"); 4317 wpa_hexdump(MSG_DEBUG, "FILS: Received FILS Session", 4318 elems.fils_session, FILS_SESSION_LEN); 4319 wpa_hexdump(MSG_DEBUG, "FILS: Expected FILS Session", 4320 sm->fils_session, FILS_SESSION_LEN); 4321 } 4322 4323 if (!elems.rsn_ie) { 4324 wpa_printf(MSG_DEBUG, 4325 "FILS: No RSNE in (Re)Association Response"); 4326 /* As an interop workaround, allow this for now since IEEE Std 4327 * 802.11ai-2016 did not include all the needed changes to make 4328 * a FILS AP include RSNE in the frame. This workaround might 4329 * eventually be removed and replaced with rejection (goto fail) 4330 * to follow a strict interpretation of the standard. */ 4331 } else if (wpa_compare_rsn_ie(wpa_key_mgmt_ft(sm->key_mgmt), 4332 sm->ap_rsn_ie, sm->ap_rsn_ie_len, 4333 elems.rsn_ie - 2, elems.rsn_ie_len + 2)) { 4334 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 4335 "FILS: RSNE mismatch between Beacon/Probe Response and (Re)Association Response"); 4336 wpa_hexdump(MSG_DEBUG, "FILS: RSNE in Beacon/Probe Response", 4337 sm->ap_rsn_ie, sm->ap_rsn_ie_len); 4338 wpa_hexdump(MSG_DEBUG, "FILS: RSNE in (Re)Association Response", 4339 elems.rsn_ie, elems.rsn_ie_len); 4340 goto fail; 4341 } 4342 4343 /* TODO: FILS Public Key */ 4344 4345 if (!elems.fils_key_confirm) { 4346 wpa_printf(MSG_DEBUG, "FILS: No FILS Key Confirm element"); 4347 goto fail; 4348 } 4349 if (elems.fils_key_confirm_len != sm->fils_key_auth_len) { 4350 wpa_printf(MSG_DEBUG, 4351 "FILS: Unexpected Key-Auth length %d (expected %d)", 4352 elems.fils_key_confirm_len, 4353 (int) sm->fils_key_auth_len); 4354 goto fail; 4355 } 4356 if (os_memcmp(elems.fils_key_confirm, sm->fils_key_auth_ap, 4357 sm->fils_key_auth_len) != 0) { 4358 wpa_printf(MSG_DEBUG, "FILS: Key-Auth mismatch"); 4359 wpa_hexdump(MSG_DEBUG, "FILS: Received Key-Auth", 4360 elems.fils_key_confirm, 4361 elems.fils_key_confirm_len); 4362 wpa_hexdump(MSG_DEBUG, "FILS: Expected Key-Auth", 4363 sm->fils_key_auth_ap, sm->fils_key_auth_len); 4364 goto fail; 4365 } 4366 4367 #ifdef CONFIG_OCV 4368 if (wpa_sm_ocv_enabled(sm)) { 4369 struct wpa_channel_info ci; 4370 4371 if (wpa_sm_channel_info(sm, &ci) != 0) { 4372 wpa_printf(MSG_WARNING, 4373 "Failed to get channel info to validate received OCI in FILS (Re)Association Response frame"); 4374 goto fail; 4375 } 4376 4377 if (ocv_verify_tx_params(elems.oci, elems.oci_len, &ci, 4378 channel_width_to_int(ci.chanwidth), 4379 ci.seg1_idx) != 0) { 4380 wpa_printf(MSG_WARNING, "FILS: %s", ocv_errorstr); 4381 goto fail; 4382 } 4383 } 4384 #endif /* CONFIG_OCV */ 4385 4386 #ifdef CONFIG_IEEE80211R 4387 if (wpa_key_mgmt_ft(sm->key_mgmt) && sm->fils_ft_ies) { 4388 struct wpa_ie_data rsn; 4389 4390 /* Check that PMKR1Name derived by the AP matches */ 4391 if (!elems.rsn_ie || 4392 wpa_parse_wpa_ie_rsn(elems.rsn_ie - 2, elems.rsn_ie_len + 2, 4393 &rsn) < 0 || 4394 !rsn.pmkid || rsn.num_pmkid != 1 || 4395 os_memcmp(rsn.pmkid, sm->pmk_r1_name, 4396 WPA_PMK_NAME_LEN) != 0) { 4397 wpa_printf(MSG_DEBUG, 4398 "FILS+FT: No RSNE[PMKR1Name] match in AssocResp"); 4399 goto fail; 4400 } 4401 } 4402 #endif /* CONFIG_IEEE80211R */ 4403 4404 /* Key Delivery */ 4405 if (!elems.key_delivery) { 4406 wpa_printf(MSG_DEBUG, "FILS: No Key Delivery element"); 4407 goto fail; 4408 } 4409 4410 /* Parse GTK and set the key to the driver */ 4411 os_memset(&gd, 0, sizeof(gd)); 4412 if (wpa_supplicant_parse_ies(elems.key_delivery + WPA_KEY_RSC_LEN, 4413 elems.key_delivery_len - WPA_KEY_RSC_LEN, 4414 &kde) < 0) { 4415 wpa_printf(MSG_DEBUG, "FILS: Failed to parse KDEs"); 4416 goto fail; 4417 } 4418 if (!kde.gtk) { 4419 wpa_printf(MSG_DEBUG, "FILS: No GTK KDE"); 4420 goto fail; 4421 } 4422 maxkeylen = gd.gtk_len = kde.gtk_len - 2; 4423 if (wpa_supplicant_check_group_cipher(sm, sm->group_cipher, 4424 gd.gtk_len, maxkeylen, 4425 &gd.key_rsc_len, &gd.alg)) 4426 goto fail; 4427 4428 wpa_hexdump_key(MSG_DEBUG, "FILS: Received GTK", kde.gtk, kde.gtk_len); 4429 gd.keyidx = kde.gtk[0] & 0x3; 4430 gd.tx = wpa_supplicant_gtk_tx_bit_workaround(sm, 4431 !!(kde.gtk[0] & BIT(2))); 4432 if (kde.gtk_len - 2 > sizeof(gd.gtk)) { 4433 wpa_printf(MSG_DEBUG, "FILS: Too long GTK in GTK KDE (len=%lu)", 4434 (unsigned long) kde.gtk_len - 2); 4435 goto fail; 4436 } 4437 os_memcpy(gd.gtk, kde.gtk + 2, kde.gtk_len - 2); 4438 4439 wpa_printf(MSG_DEBUG, "FILS: Set GTK to driver"); 4440 if (wpa_supplicant_install_gtk(sm, &gd, elems.key_delivery, 0) < 0) { 4441 wpa_printf(MSG_DEBUG, "FILS: Failed to set GTK"); 4442 goto fail; 4443 } 4444 4445 if (ieee80211w_set_keys(sm, &kde) < 0) { 4446 wpa_printf(MSG_DEBUG, "FILS: Failed to set IGTK"); 4447 goto fail; 4448 } 4449 4450 alg = wpa_cipher_to_alg(sm->pairwise_cipher); 4451 keylen = wpa_cipher_key_len(sm->pairwise_cipher); 4452 if (keylen <= 0 || (unsigned int) keylen != sm->ptk.tk_len) { 4453 wpa_printf(MSG_DEBUG, "FILS: TK length mismatch: %u != %lu", 4454 keylen, (long unsigned int) sm->ptk.tk_len); 4455 goto fail; 4456 } 4457 rsclen = wpa_cipher_rsc_len(sm->pairwise_cipher); 4458 wpa_hexdump_key(MSG_DEBUG, "FILS: Set TK to driver", 4459 sm->ptk.tk, keylen); 4460 if (wpa_sm_set_key(sm, alg, sm->bssid, 0, 1, null_rsc, rsclen, 4461 sm->ptk.tk, keylen) < 0) { 4462 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 4463 "FILS: Failed to set PTK to the driver (alg=%d keylen=%d bssid=" 4464 MACSTR ")", 4465 alg, keylen, MAC2STR(sm->bssid)); 4466 goto fail; 4467 } 4468 4469 /* TODO: TK could be cleared after auth frame exchange now that driver 4470 * takes care of association frame encryption/decryption. */ 4471 /* TK is not needed anymore in supplicant */ 4472 os_memset(sm->ptk.tk, 0, WPA_TK_MAX_LEN); 4473 sm->ptk.tk_len = 0; 4474 sm->ptk.installed = 1; 4475 4476 /* FILS HLP Container */ 4477 fils_process_hlp_container(sm, ie_start, end - ie_start); 4478 4479 /* TODO: FILS IP Address Assignment */ 4480 4481 wpa_printf(MSG_DEBUG, "FILS: Auth+Assoc completed successfully"); 4482 sm->fils_completed = 1; 4483 forced_memzero(&gd, sizeof(gd)); 4484 4485 return 0; 4486 fail: 4487 forced_memzero(&gd, sizeof(gd)); 4488 return -1; 4489 } 4490 4491 4492 void wpa_sm_set_reset_fils_completed(struct wpa_sm *sm, int set) 4493 { 4494 if (sm) 4495 sm->fils_completed = !!set; 4496 } 4497 4498 #endif /* CONFIG_FILS */ 4499 4500 4501 int wpa_fils_is_completed(struct wpa_sm *sm) 4502 { 4503 #ifdef CONFIG_FILS 4504 return sm && sm->fils_completed; 4505 #else /* CONFIG_FILS */ 4506 return 0; 4507 #endif /* CONFIG_FILS */ 4508 } 4509 4510 4511 #ifdef CONFIG_OWE 4512 4513 struct wpabuf * owe_build_assoc_req(struct wpa_sm *sm, u16 group) 4514 { 4515 struct wpabuf *ie = NULL, *pub = NULL; 4516 size_t prime_len; 4517 4518 if (group == 19) 4519 prime_len = 32; 4520 else if (group == 20) 4521 prime_len = 48; 4522 else if (group == 21) 4523 prime_len = 66; 4524 else 4525 return NULL; 4526 4527 crypto_ecdh_deinit(sm->owe_ecdh); 4528 sm->owe_ecdh = crypto_ecdh_init(group); 4529 if (!sm->owe_ecdh) 4530 goto fail; 4531 sm->owe_group = group; 4532 pub = crypto_ecdh_get_pubkey(sm->owe_ecdh, 0); 4533 pub = wpabuf_zeropad(pub, prime_len); 4534 if (!pub) 4535 goto fail; 4536 4537 ie = wpabuf_alloc(5 + wpabuf_len(pub)); 4538 if (!ie) 4539 goto fail; 4540 wpabuf_put_u8(ie, WLAN_EID_EXTENSION); 4541 wpabuf_put_u8(ie, 1 + 2 + wpabuf_len(pub)); 4542 wpabuf_put_u8(ie, WLAN_EID_EXT_OWE_DH_PARAM); 4543 wpabuf_put_le16(ie, group); 4544 wpabuf_put_buf(ie, pub); 4545 wpabuf_free(pub); 4546 wpa_hexdump_buf(MSG_DEBUG, "OWE: Diffie-Hellman Parameter element", 4547 ie); 4548 4549 return ie; 4550 fail: 4551 wpabuf_free(pub); 4552 crypto_ecdh_deinit(sm->owe_ecdh); 4553 sm->owe_ecdh = NULL; 4554 return NULL; 4555 } 4556 4557 4558 int owe_process_assoc_resp(struct wpa_sm *sm, const u8 *bssid, 4559 const u8 *resp_ies, size_t resp_ies_len) 4560 { 4561 struct ieee802_11_elems elems; 4562 u16 group; 4563 struct wpabuf *secret, *pub, *hkey; 4564 int res; 4565 u8 prk[SHA512_MAC_LEN], pmkid[SHA512_MAC_LEN]; 4566 const char *info = "OWE Key Generation"; 4567 const u8 *addr[2]; 4568 size_t len[2]; 4569 size_t hash_len, prime_len; 4570 struct wpa_ie_data data; 4571 4572 if (!resp_ies || 4573 ieee802_11_parse_elems(resp_ies, resp_ies_len, &elems, 1) == 4574 ParseFailed) { 4575 wpa_printf(MSG_INFO, 4576 "OWE: Could not parse Association Response frame elements"); 4577 return -1; 4578 } 4579 4580 if (sm->cur_pmksa && elems.rsn_ie && 4581 wpa_parse_wpa_ie_rsn(elems.rsn_ie - 2, 2 + elems.rsn_ie_len, 4582 &data) == 0 && 4583 data.num_pmkid == 1 && data.pmkid && 4584 os_memcmp(sm->cur_pmksa->pmkid, data.pmkid, PMKID_LEN) == 0) { 4585 wpa_printf(MSG_DEBUG, "OWE: Use PMKSA caching"); 4586 wpa_sm_set_pmk_from_pmksa(sm); 4587 return 0; 4588 } 4589 4590 if (!elems.owe_dh) { 4591 wpa_printf(MSG_INFO, 4592 "OWE: No Diffie-Hellman Parameter element found in Association Response frame"); 4593 return -1; 4594 } 4595 4596 group = WPA_GET_LE16(elems.owe_dh); 4597 if (group != sm->owe_group) { 4598 wpa_printf(MSG_INFO, 4599 "OWE: Unexpected Diffie-Hellman group in response: %u", 4600 group); 4601 return -1; 4602 } 4603 4604 if (!sm->owe_ecdh) { 4605 wpa_printf(MSG_INFO, "OWE: No ECDH state available"); 4606 return -1; 4607 } 4608 4609 if (group == 19) 4610 prime_len = 32; 4611 else if (group == 20) 4612 prime_len = 48; 4613 else if (group == 21) 4614 prime_len = 66; 4615 else 4616 return -1; 4617 4618 secret = crypto_ecdh_set_peerkey(sm->owe_ecdh, 0, 4619 elems.owe_dh + 2, 4620 elems.owe_dh_len - 2); 4621 secret = wpabuf_zeropad(secret, prime_len); 4622 if (!secret) { 4623 wpa_printf(MSG_DEBUG, "OWE: Invalid peer DH public key"); 4624 return -1; 4625 } 4626 wpa_hexdump_buf_key(MSG_DEBUG, "OWE: DH shared secret", secret); 4627 4628 /* prk = HKDF-extract(C | A | group, z) */ 4629 4630 pub = crypto_ecdh_get_pubkey(sm->owe_ecdh, 0); 4631 if (!pub) { 4632 wpabuf_clear_free(secret); 4633 return -1; 4634 } 4635 4636 /* PMKID = Truncate-128(Hash(C | A)) */ 4637 addr[0] = wpabuf_head(pub); 4638 len[0] = wpabuf_len(pub); 4639 addr[1] = elems.owe_dh + 2; 4640 len[1] = elems.owe_dh_len - 2; 4641 if (group == 19) { 4642 res = sha256_vector(2, addr, len, pmkid); 4643 hash_len = SHA256_MAC_LEN; 4644 } else if (group == 20) { 4645 res = sha384_vector(2, addr, len, pmkid); 4646 hash_len = SHA384_MAC_LEN; 4647 } else if (group == 21) { 4648 res = sha512_vector(2, addr, len, pmkid); 4649 hash_len = SHA512_MAC_LEN; 4650 } else { 4651 res = -1; 4652 hash_len = 0; 4653 } 4654 pub = wpabuf_zeropad(pub, prime_len); 4655 if (res < 0 || !pub) { 4656 wpabuf_free(pub); 4657 wpabuf_clear_free(secret); 4658 return -1; 4659 } 4660 4661 hkey = wpabuf_alloc(wpabuf_len(pub) + elems.owe_dh_len - 2 + 2); 4662 if (!hkey) { 4663 wpabuf_free(pub); 4664 wpabuf_clear_free(secret); 4665 return -1; 4666 } 4667 4668 wpabuf_put_buf(hkey, pub); /* C */ 4669 wpabuf_free(pub); 4670 wpabuf_put_data(hkey, elems.owe_dh + 2, elems.owe_dh_len - 2); /* A */ 4671 wpabuf_put_le16(hkey, sm->owe_group); /* group */ 4672 if (group == 19) 4673 res = hmac_sha256(wpabuf_head(hkey), wpabuf_len(hkey), 4674 wpabuf_head(secret), wpabuf_len(secret), prk); 4675 else if (group == 20) 4676 res = hmac_sha384(wpabuf_head(hkey), wpabuf_len(hkey), 4677 wpabuf_head(secret), wpabuf_len(secret), prk); 4678 else if (group == 21) 4679 res = hmac_sha512(wpabuf_head(hkey), wpabuf_len(hkey), 4680 wpabuf_head(secret), wpabuf_len(secret), prk); 4681 wpabuf_clear_free(hkey); 4682 wpabuf_clear_free(secret); 4683 if (res < 0) 4684 return -1; 4685 4686 wpa_hexdump_key(MSG_DEBUG, "OWE: prk", prk, hash_len); 4687 4688 /* PMK = HKDF-expand(prk, "OWE Key Generation", n) */ 4689 4690 if (group == 19) 4691 res = hmac_sha256_kdf(prk, hash_len, NULL, (const u8 *) info, 4692 os_strlen(info), sm->pmk, hash_len); 4693 else if (group == 20) 4694 res = hmac_sha384_kdf(prk, hash_len, NULL, (const u8 *) info, 4695 os_strlen(info), sm->pmk, hash_len); 4696 else if (group == 21) 4697 res = hmac_sha512_kdf(prk, hash_len, NULL, (const u8 *) info, 4698 os_strlen(info), sm->pmk, hash_len); 4699 forced_memzero(prk, SHA512_MAC_LEN); 4700 if (res < 0) { 4701 sm->pmk_len = 0; 4702 return -1; 4703 } 4704 sm->pmk_len = hash_len; 4705 4706 wpa_hexdump_key(MSG_DEBUG, "OWE: PMK", sm->pmk, sm->pmk_len); 4707 wpa_hexdump(MSG_DEBUG, "OWE: PMKID", pmkid, PMKID_LEN); 4708 pmksa_cache_add(sm->pmksa, sm->pmk, sm->pmk_len, pmkid, NULL, 0, 4709 bssid, sm->own_addr, sm->network_ctx, sm->key_mgmt, 4710 NULL); 4711 4712 return 0; 4713 } 4714 4715 #endif /* CONFIG_OWE */ 4716 4717 4718 void wpa_sm_set_fils_cache_id(struct wpa_sm *sm, const u8 *fils_cache_id) 4719 { 4720 #ifdef CONFIG_FILS 4721 if (sm && fils_cache_id) { 4722 sm->fils_cache_id_set = 1; 4723 os_memcpy(sm->fils_cache_id, fils_cache_id, FILS_CACHE_ID_LEN); 4724 } 4725 #endif /* CONFIG_FILS */ 4726 } 4727 4728 4729 #ifdef CONFIG_DPP2 4730 void wpa_sm_set_dpp_z(struct wpa_sm *sm, const struct wpabuf *z) 4731 { 4732 if (sm) { 4733 wpabuf_clear_free(sm->dpp_z); 4734 sm->dpp_z = z ? wpabuf_dup(z) : NULL; 4735 } 4736 } 4737 #endif /* CONFIG_DPP2 */ 4738