1 /* 2 * WPA Supplicant - PeerKey for Direct Link Setup (DLS) 3 * Copyright (c) 2006-2008, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "includes.h" 10 11 #ifdef CONFIG_PEERKEY 12 13 #include "common.h" 14 #include "eloop.h" 15 #include "crypto/sha1.h" 16 #include "crypto/sha256.h" 17 #include "crypto/random.h" 18 #include "common/ieee802_11_defs.h" 19 #include "wpa.h" 20 #include "wpa_i.h" 21 #include "wpa_ie.h" 22 #include "peerkey.h" 23 24 25 static u8 * wpa_add_ie(u8 *pos, const u8 *ie, size_t ie_len) 26 { 27 os_memcpy(pos, ie, ie_len); 28 return pos + ie_len; 29 } 30 31 32 static u8 * wpa_add_kde(u8 *pos, u32 kde, const u8 *data, size_t data_len) 33 { 34 *pos++ = WLAN_EID_VENDOR_SPECIFIC; 35 *pos++ = RSN_SELECTOR_LEN + data_len; 36 RSN_SELECTOR_PUT(pos, kde); 37 pos += RSN_SELECTOR_LEN; 38 os_memcpy(pos, data, data_len); 39 pos += data_len; 40 return pos; 41 } 42 43 44 static void wpa_supplicant_smk_timeout(void *eloop_ctx, void *timeout_ctx) 45 { 46 #if 0 47 struct wpa_sm *sm = eloop_ctx; 48 struct wpa_peerkey *peerkey = timeout_ctx; 49 #endif 50 /* TODO: time out SMK and any STK that was generated using this SMK */ 51 } 52 53 54 static void wpa_supplicant_peerkey_free(struct wpa_sm *sm, 55 struct wpa_peerkey *peerkey) 56 { 57 eloop_cancel_timeout(wpa_supplicant_smk_timeout, sm, peerkey); 58 os_free(peerkey); 59 } 60 61 62 static int wpa_supplicant_send_smk_error(struct wpa_sm *sm, const u8 *dst, 63 const u8 *peer, 64 u16 mui, u16 error_type, int ver) 65 { 66 size_t rlen; 67 struct wpa_eapol_key *err; 68 struct rsn_error_kde error; 69 u8 *rbuf, *pos; 70 size_t kde_len; 71 u16 key_info; 72 73 kde_len = 2 + RSN_SELECTOR_LEN + sizeof(error); 74 if (peer) 75 kde_len += 2 + RSN_SELECTOR_LEN + ETH_ALEN; 76 77 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, 78 NULL, sizeof(*err) + kde_len, &rlen, 79 (void *) &err); 80 if (rbuf == NULL) 81 return -1; 82 83 err->type = EAPOL_KEY_TYPE_RSN; 84 key_info = ver | WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_MIC | 85 WPA_KEY_INFO_SECURE | WPA_KEY_INFO_ERROR | 86 WPA_KEY_INFO_REQUEST; 87 WPA_PUT_BE16(err->key_info, key_info); 88 WPA_PUT_BE16(err->key_length, 0); 89 os_memcpy(err->replay_counter, sm->request_counter, 90 WPA_REPLAY_COUNTER_LEN); 91 inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN); 92 93 WPA_PUT_BE16(err->key_data_length, (u16) kde_len); 94 pos = (u8 *) (err + 1); 95 96 if (peer) { 97 /* Peer MAC Address KDE */ 98 pos = wpa_add_kde(pos, RSN_KEY_DATA_MAC_ADDR, peer, ETH_ALEN); 99 } 100 101 /* Error KDE */ 102 error.mui = host_to_be16(mui); 103 error.error_type = host_to_be16(error_type); 104 wpa_add_kde(pos, RSN_KEY_DATA_ERROR, (u8 *) &error, sizeof(error)); 105 106 if (peer) { 107 wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key SMK Error (peer " 108 MACSTR " mui %d error_type %d)", 109 MAC2STR(peer), mui, error_type); 110 } else { 111 wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key SMK Error " 112 "(mui %d error_type %d)", mui, error_type); 113 } 114 115 wpa_eapol_key_send(sm, sm->ptk.kck, ver, dst, ETH_P_EAPOL, 116 rbuf, rlen, err->key_mic); 117 118 return 0; 119 } 120 121 122 static int wpa_supplicant_send_smk_m3(struct wpa_sm *sm, 123 const unsigned char *src_addr, 124 const struct wpa_eapol_key *key, 125 int ver, struct wpa_peerkey *peerkey) 126 { 127 size_t rlen; 128 struct wpa_eapol_key *reply; 129 u8 *rbuf, *pos; 130 size_t kde_len; 131 u16 key_info; 132 133 /* KDEs: Peer RSN IE, Initiator MAC Address, Initiator Nonce */ 134 kde_len = peerkey->rsnie_p_len + 135 2 + RSN_SELECTOR_LEN + ETH_ALEN + 136 2 + RSN_SELECTOR_LEN + WPA_NONCE_LEN; 137 138 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, 139 NULL, sizeof(*reply) + kde_len, &rlen, 140 (void *) &reply); 141 if (rbuf == NULL) 142 return -1; 143 144 reply->type = EAPOL_KEY_TYPE_RSN; 145 key_info = ver | WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_MIC | 146 WPA_KEY_INFO_SECURE; 147 WPA_PUT_BE16(reply->key_info, key_info); 148 WPA_PUT_BE16(reply->key_length, 0); 149 os_memcpy(reply->replay_counter, key->replay_counter, 150 WPA_REPLAY_COUNTER_LEN); 151 152 os_memcpy(reply->key_nonce, peerkey->pnonce, WPA_NONCE_LEN); 153 154 WPA_PUT_BE16(reply->key_data_length, (u16) kde_len); 155 pos = (u8 *) (reply + 1); 156 157 /* Peer RSN IE */ 158 pos = wpa_add_ie(pos, peerkey->rsnie_p, peerkey->rsnie_p_len); 159 160 /* Initiator MAC Address KDE */ 161 pos = wpa_add_kde(pos, RSN_KEY_DATA_MAC_ADDR, peerkey->addr, ETH_ALEN); 162 163 /* Initiator Nonce */ 164 wpa_add_kde(pos, RSN_KEY_DATA_NONCE, peerkey->inonce, WPA_NONCE_LEN); 165 166 wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key SMK M3"); 167 wpa_eapol_key_send(sm, sm->ptk.kck, ver, src_addr, ETH_P_EAPOL, 168 rbuf, rlen, reply->key_mic); 169 170 return 0; 171 } 172 173 174 static int wpa_supplicant_process_smk_m2( 175 struct wpa_sm *sm, const unsigned char *src_addr, 176 const struct wpa_eapol_key *key, size_t extra_len, int ver) 177 { 178 struct wpa_peerkey *peerkey; 179 struct wpa_eapol_ie_parse kde; 180 struct wpa_ie_data ie; 181 int cipher; 182 struct rsn_ie_hdr *hdr; 183 u8 *pos; 184 185 wpa_printf(MSG_DEBUG, "RSN: Received SMK M2"); 186 187 if (!sm->peerkey_enabled || sm->proto != WPA_PROTO_RSN) { 188 wpa_printf(MSG_INFO, "RSN: SMK handshake not allowed for " 189 "the current network"); 190 return -1; 191 } 192 193 if (wpa_supplicant_parse_ies((const u8 *) (key + 1), extra_len, &kde) < 194 0) { 195 wpa_printf(MSG_INFO, "RSN: Failed to parse KDEs in SMK M2"); 196 return -1; 197 } 198 199 if (kde.rsn_ie == NULL || kde.mac_addr == NULL || 200 kde.mac_addr_len < ETH_ALEN) { 201 wpa_printf(MSG_INFO, "RSN: No RSN IE or MAC address KDE in " 202 "SMK M2"); 203 return -1; 204 } 205 206 wpa_printf(MSG_DEBUG, "RSN: SMK M2 - SMK initiator " MACSTR, 207 MAC2STR(kde.mac_addr)); 208 209 if (kde.rsn_ie_len > PEERKEY_MAX_IE_LEN) { 210 wpa_printf(MSG_INFO, "RSN: Too long Initiator RSN IE in SMK " 211 "M2"); 212 return -1; 213 } 214 215 if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) { 216 wpa_printf(MSG_INFO, "RSN: Failed to parse RSN IE in SMK M2"); 217 return -1; 218 } 219 220 cipher = ie.pairwise_cipher & sm->allowed_pairwise_cipher; 221 if (cipher & WPA_CIPHER_CCMP) { 222 wpa_printf(MSG_DEBUG, "RSN: Using CCMP for PeerKey"); 223 cipher = WPA_CIPHER_CCMP; 224 } else if (cipher & WPA_CIPHER_GCMP) { 225 wpa_printf(MSG_DEBUG, "RSN: Using GCMP for PeerKey"); 226 cipher = WPA_CIPHER_GCMP; 227 } else if (cipher & WPA_CIPHER_TKIP) { 228 wpa_printf(MSG_DEBUG, "RSN: Using TKIP for PeerKey"); 229 cipher = WPA_CIPHER_TKIP; 230 } else { 231 wpa_printf(MSG_INFO, "RSN: No acceptable cipher in SMK M2"); 232 wpa_supplicant_send_smk_error(sm, src_addr, kde.mac_addr, 233 STK_MUI_SMK, STK_ERR_CPHR_NS, 234 ver); 235 return -1; 236 } 237 238 /* TODO: find existing entry and if found, use that instead of adding 239 * a new one; how to handle the case where both ends initiate at the 240 * same time? */ 241 peerkey = os_zalloc(sizeof(*peerkey)); 242 if (peerkey == NULL) 243 return -1; 244 os_memcpy(peerkey->addr, kde.mac_addr, ETH_ALEN); 245 os_memcpy(peerkey->inonce, key->key_nonce, WPA_NONCE_LEN); 246 os_memcpy(peerkey->rsnie_i, kde.rsn_ie, kde.rsn_ie_len); 247 peerkey->rsnie_i_len = kde.rsn_ie_len; 248 peerkey->cipher = cipher; 249 #ifdef CONFIG_IEEE80211W 250 if (ie.key_mgmt & (WPA_KEY_MGMT_IEEE8021X_SHA256 | 251 WPA_KEY_MGMT_PSK_SHA256)) 252 peerkey->use_sha256 = 1; 253 #endif /* CONFIG_IEEE80211W */ 254 255 if (random_get_bytes(peerkey->pnonce, WPA_NONCE_LEN)) { 256 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 257 "WPA: Failed to get random data for PNonce"); 258 wpa_supplicant_peerkey_free(sm, peerkey); 259 return -1; 260 } 261 262 hdr = (struct rsn_ie_hdr *) peerkey->rsnie_p; 263 hdr->elem_id = WLAN_EID_RSN; 264 WPA_PUT_LE16(hdr->version, RSN_VERSION); 265 pos = (u8 *) (hdr + 1); 266 /* Group Suite can be anything for SMK RSN IE; receiver will just 267 * ignore it. */ 268 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP); 269 pos += RSN_SELECTOR_LEN; 270 /* Include only the selected cipher in pairwise cipher suite */ 271 WPA_PUT_LE16(pos, 1); 272 pos += 2; 273 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN, cipher)); 274 pos += RSN_SELECTOR_LEN; 275 276 hdr->len = (pos - peerkey->rsnie_p) - 2; 277 peerkey->rsnie_p_len = pos - peerkey->rsnie_p; 278 wpa_hexdump(MSG_DEBUG, "WPA: RSN IE for SMK handshake", 279 peerkey->rsnie_p, peerkey->rsnie_p_len); 280 281 wpa_supplicant_send_smk_m3(sm, src_addr, key, ver, peerkey); 282 283 peerkey->next = sm->peerkey; 284 sm->peerkey = peerkey; 285 286 return 0; 287 } 288 289 290 /** 291 * rsn_smkid - Derive SMK identifier 292 * @smk: Station master key (32 bytes) 293 * @pnonce: Peer Nonce 294 * @mac_p: Peer MAC address 295 * @inonce: Initiator Nonce 296 * @mac_i: Initiator MAC address 297 * @use_sha256: Whether to use SHA256-based KDF 298 * 299 * 8.5.1.4 Station to station (STK) key hierarchy 300 * SMKID = HMAC-SHA1-128(SMK, "SMK Name" || PNonce || MAC_P || INonce || MAC_I) 301 */ 302 static void rsn_smkid(const u8 *smk, const u8 *pnonce, const u8 *mac_p, 303 const u8 *inonce, const u8 *mac_i, u8 *smkid, 304 int use_sha256) 305 { 306 char *title = "SMK Name"; 307 const u8 *addr[5]; 308 const size_t len[5] = { 8, WPA_NONCE_LEN, ETH_ALEN, WPA_NONCE_LEN, 309 ETH_ALEN }; 310 unsigned char hash[SHA256_MAC_LEN]; 311 312 addr[0] = (u8 *) title; 313 addr[1] = pnonce; 314 addr[2] = mac_p; 315 addr[3] = inonce; 316 addr[4] = mac_i; 317 318 #ifdef CONFIG_IEEE80211W 319 if (use_sha256) 320 hmac_sha256_vector(smk, PMK_LEN, 5, addr, len, hash); 321 else 322 #endif /* CONFIG_IEEE80211W */ 323 hmac_sha1_vector(smk, PMK_LEN, 5, addr, len, hash); 324 os_memcpy(smkid, hash, PMKID_LEN); 325 } 326 327 328 static void wpa_supplicant_send_stk_1_of_4(struct wpa_sm *sm, 329 struct wpa_peerkey *peerkey) 330 { 331 size_t mlen; 332 struct wpa_eapol_key *msg; 333 u8 *mbuf; 334 size_t kde_len; 335 u16 key_info, ver; 336 337 kde_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN; 338 339 mbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL, 340 sizeof(*msg) + kde_len, &mlen, 341 (void *) &msg); 342 if (mbuf == NULL) 343 return; 344 345 msg->type = EAPOL_KEY_TYPE_RSN; 346 347 if (peerkey->cipher != WPA_CIPHER_TKIP) 348 ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES; 349 else 350 ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4; 351 352 key_info = ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_ACK; 353 WPA_PUT_BE16(msg->key_info, key_info); 354 355 if (peerkey->cipher != WPA_CIPHER_TKIP) 356 WPA_PUT_BE16(msg->key_length, 16); 357 else 358 WPA_PUT_BE16(msg->key_length, 32); 359 360 os_memcpy(msg->replay_counter, peerkey->replay_counter, 361 WPA_REPLAY_COUNTER_LEN); 362 inc_byte_array(peerkey->replay_counter, WPA_REPLAY_COUNTER_LEN); 363 364 WPA_PUT_BE16(msg->key_data_length, kde_len); 365 wpa_add_kde((u8 *) (msg + 1), RSN_KEY_DATA_PMKID, 366 peerkey->smkid, PMKID_LEN); 367 368 if (random_get_bytes(peerkey->inonce, WPA_NONCE_LEN)) { 369 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 370 "RSN: Failed to get random data for INonce (STK)"); 371 os_free(mbuf); 372 return; 373 } 374 wpa_hexdump(MSG_DEBUG, "RSN: INonce for STK 4-Way Handshake", 375 peerkey->inonce, WPA_NONCE_LEN); 376 os_memcpy(msg->key_nonce, peerkey->inonce, WPA_NONCE_LEN); 377 378 wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key STK 1/4 to " MACSTR, 379 MAC2STR(peerkey->addr)); 380 wpa_eapol_key_send(sm, NULL, ver, peerkey->addr, ETH_P_EAPOL, 381 mbuf, mlen, NULL); 382 } 383 384 385 static void wpa_supplicant_send_stk_3_of_4(struct wpa_sm *sm, 386 struct wpa_peerkey *peerkey) 387 { 388 size_t mlen; 389 struct wpa_eapol_key *msg; 390 u8 *mbuf, *pos; 391 size_t kde_len; 392 u16 key_info, ver; 393 be32 lifetime; 394 395 kde_len = peerkey->rsnie_i_len + 396 2 + RSN_SELECTOR_LEN + sizeof(lifetime); 397 398 mbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL, 399 sizeof(*msg) + kde_len, &mlen, 400 (void *) &msg); 401 if (mbuf == NULL) 402 return; 403 404 msg->type = EAPOL_KEY_TYPE_RSN; 405 406 if (peerkey->cipher != WPA_CIPHER_TKIP) 407 ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES; 408 else 409 ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4; 410 411 key_info = ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_ACK | 412 WPA_KEY_INFO_MIC | WPA_KEY_INFO_SECURE; 413 WPA_PUT_BE16(msg->key_info, key_info); 414 415 if (peerkey->cipher != WPA_CIPHER_TKIP) 416 WPA_PUT_BE16(msg->key_length, 16); 417 else 418 WPA_PUT_BE16(msg->key_length, 32); 419 420 os_memcpy(msg->replay_counter, peerkey->replay_counter, 421 WPA_REPLAY_COUNTER_LEN); 422 inc_byte_array(peerkey->replay_counter, WPA_REPLAY_COUNTER_LEN); 423 424 WPA_PUT_BE16(msg->key_data_length, kde_len); 425 pos = (u8 *) (msg + 1); 426 pos = wpa_add_ie(pos, peerkey->rsnie_i, peerkey->rsnie_i_len); 427 lifetime = host_to_be32(peerkey->lifetime); 428 wpa_add_kde(pos, RSN_KEY_DATA_LIFETIME, 429 (u8 *) &lifetime, sizeof(lifetime)); 430 431 os_memcpy(msg->key_nonce, peerkey->inonce, WPA_NONCE_LEN); 432 433 wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key STK 3/4 to " MACSTR, 434 MAC2STR(peerkey->addr)); 435 wpa_eapol_key_send(sm, peerkey->stk.kck, ver, peerkey->addr, 436 ETH_P_EAPOL, mbuf, mlen, msg->key_mic); 437 } 438 439 440 static int wpa_supplicant_process_smk_m4(struct wpa_peerkey *peerkey, 441 struct wpa_eapol_ie_parse *kde) 442 { 443 wpa_printf(MSG_DEBUG, "RSN: Received SMK M4 (Initiator " MACSTR ")", 444 MAC2STR(kde->mac_addr)); 445 446 if (os_memcmp(kde->smk + PMK_LEN, peerkey->pnonce, WPA_NONCE_LEN) != 0) 447 { 448 wpa_printf(MSG_INFO, "RSN: PNonce in SMK KDE does not " 449 "match with the one used in SMK M3"); 450 return -1; 451 } 452 453 if (os_memcmp(kde->nonce, peerkey->inonce, WPA_NONCE_LEN) != 0) { 454 wpa_printf(MSG_INFO, "RSN: INonce in SMK M4 did not " 455 "match with the one received in SMK M2"); 456 return -1; 457 } 458 459 return 0; 460 } 461 462 463 static int wpa_supplicant_process_smk_m5(struct wpa_sm *sm, 464 const unsigned char *src_addr, 465 const struct wpa_eapol_key *key, 466 int ver, 467 struct wpa_peerkey *peerkey, 468 struct wpa_eapol_ie_parse *kde) 469 { 470 int cipher; 471 struct wpa_ie_data ie; 472 473 wpa_printf(MSG_DEBUG, "RSN: Received SMK M5 (Peer " MACSTR ")", 474 MAC2STR(kde->mac_addr)); 475 if (kde->rsn_ie == NULL || kde->rsn_ie_len > PEERKEY_MAX_IE_LEN || 476 wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0) { 477 wpa_printf(MSG_INFO, "RSN: No RSN IE in SMK M5"); 478 /* TODO: abort negotiation */ 479 return -1; 480 } 481 482 if (os_memcmp(key->key_nonce, peerkey->inonce, WPA_NONCE_LEN) != 0) { 483 wpa_printf(MSG_INFO, "RSN: Key Nonce in SMK M5 does " 484 "not match with INonce used in SMK M1"); 485 return -1; 486 } 487 488 if (os_memcmp(kde->smk + PMK_LEN, peerkey->inonce, WPA_NONCE_LEN) != 0) 489 { 490 wpa_printf(MSG_INFO, "RSN: INonce in SMK KDE does not " 491 "match with the one used in SMK M1"); 492 return -1; 493 } 494 495 os_memcpy(peerkey->rsnie_p, kde->rsn_ie, kde->rsn_ie_len); 496 peerkey->rsnie_p_len = kde->rsn_ie_len; 497 os_memcpy(peerkey->pnonce, kde->nonce, WPA_NONCE_LEN); 498 499 cipher = ie.pairwise_cipher & sm->allowed_pairwise_cipher; 500 if (cipher & WPA_CIPHER_CCMP) { 501 wpa_printf(MSG_DEBUG, "RSN: Using CCMP for PeerKey"); 502 peerkey->cipher = WPA_CIPHER_CCMP; 503 } else if (cipher & WPA_CIPHER_GCMP) { 504 wpa_printf(MSG_DEBUG, "RSN: Using GCMP for PeerKey"); 505 peerkey->cipher = WPA_CIPHER_GCMP; 506 } else if (cipher & WPA_CIPHER_TKIP) { 507 wpa_printf(MSG_DEBUG, "RSN: Using TKIP for PeerKey"); 508 peerkey->cipher = WPA_CIPHER_TKIP; 509 } else { 510 wpa_printf(MSG_INFO, "RSN: SMK Peer STA " MACSTR " selected " 511 "unacceptable cipher", MAC2STR(kde->mac_addr)); 512 wpa_supplicant_send_smk_error(sm, src_addr, kde->mac_addr, 513 STK_MUI_SMK, STK_ERR_CPHR_NS, 514 ver); 515 /* TODO: abort negotiation */ 516 return -1; 517 } 518 519 return 0; 520 } 521 522 523 static int wpa_supplicant_process_smk_m45( 524 struct wpa_sm *sm, const unsigned char *src_addr, 525 const struct wpa_eapol_key *key, size_t extra_len, int ver) 526 { 527 struct wpa_peerkey *peerkey; 528 struct wpa_eapol_ie_parse kde; 529 u32 lifetime; 530 struct os_time now; 531 532 if (!sm->peerkey_enabled || sm->proto != WPA_PROTO_RSN) { 533 wpa_printf(MSG_DEBUG, "RSN: SMK handshake not allowed for " 534 "the current network"); 535 return -1; 536 } 537 538 if (wpa_supplicant_parse_ies((const u8 *) (key + 1), extra_len, &kde) < 539 0) { 540 wpa_printf(MSG_INFO, "RSN: Failed to parse KDEs in SMK M4/M5"); 541 return -1; 542 } 543 544 if (kde.mac_addr == NULL || kde.mac_addr_len < ETH_ALEN || 545 kde.nonce == NULL || kde.nonce_len < WPA_NONCE_LEN || 546 kde.smk == NULL || kde.smk_len < PMK_LEN + WPA_NONCE_LEN || 547 kde.lifetime == NULL || kde.lifetime_len < 4) { 548 wpa_printf(MSG_INFO, "RSN: No MAC Address, Nonce, SMK, or " 549 "Lifetime KDE in SMK M4/M5"); 550 return -1; 551 } 552 553 for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) { 554 if (os_memcmp(peerkey->addr, kde.mac_addr, ETH_ALEN) == 0 && 555 os_memcmp(peerkey->initiator ? peerkey->inonce : 556 peerkey->pnonce, 557 key->key_nonce, WPA_NONCE_LEN) == 0) 558 break; 559 } 560 if (peerkey == NULL) { 561 wpa_printf(MSG_INFO, "RSN: No matching SMK handshake found " 562 "for SMK M4/M5: peer " MACSTR, 563 MAC2STR(kde.mac_addr)); 564 return -1; 565 } 566 567 if (peerkey->initiator) { 568 if (wpa_supplicant_process_smk_m5(sm, src_addr, key, ver, 569 peerkey, &kde) < 0) 570 return -1; 571 } else { 572 if (wpa_supplicant_process_smk_m4(peerkey, &kde) < 0) 573 return -1; 574 } 575 576 os_memcpy(peerkey->smk, kde.smk, PMK_LEN); 577 peerkey->smk_complete = 1; 578 wpa_hexdump_key(MSG_DEBUG, "RSN: SMK", peerkey->smk, PMK_LEN); 579 lifetime = WPA_GET_BE32(kde.lifetime); 580 wpa_printf(MSG_DEBUG, "RSN: SMK lifetime %u seconds", lifetime); 581 if (lifetime > 1000000000) 582 lifetime = 1000000000; /* avoid overflowing expiration time */ 583 peerkey->lifetime = lifetime; 584 os_get_time(&now); 585 peerkey->expiration = now.sec + lifetime; 586 eloop_register_timeout(lifetime, 0, wpa_supplicant_smk_timeout, 587 sm, peerkey); 588 589 if (peerkey->initiator) { 590 rsn_smkid(peerkey->smk, peerkey->pnonce, peerkey->addr, 591 peerkey->inonce, sm->own_addr, peerkey->smkid, 592 peerkey->use_sha256); 593 wpa_supplicant_send_stk_1_of_4(sm, peerkey); 594 } else { 595 rsn_smkid(peerkey->smk, peerkey->pnonce, sm->own_addr, 596 peerkey->inonce, peerkey->addr, peerkey->smkid, 597 peerkey->use_sha256); 598 } 599 wpa_hexdump(MSG_DEBUG, "RSN: SMKID", peerkey->smkid, PMKID_LEN); 600 601 return 0; 602 } 603 604 605 static int wpa_supplicant_process_smk_error( 606 struct wpa_sm *sm, const unsigned char *src_addr, 607 const struct wpa_eapol_key *key, size_t extra_len) 608 { 609 struct wpa_eapol_ie_parse kde; 610 struct rsn_error_kde error; 611 u8 peer[ETH_ALEN]; 612 u16 error_type; 613 614 wpa_printf(MSG_DEBUG, "RSN: Received SMK Error"); 615 616 if (!sm->peerkey_enabled || sm->proto != WPA_PROTO_RSN) { 617 wpa_printf(MSG_DEBUG, "RSN: SMK handshake not allowed for " 618 "the current network"); 619 return -1; 620 } 621 622 if (wpa_supplicant_parse_ies((const u8 *) (key + 1), extra_len, &kde) < 623 0) { 624 wpa_printf(MSG_INFO, "RSN: Failed to parse KDEs in SMK Error"); 625 return -1; 626 } 627 628 if (kde.error == NULL || kde.error_len < sizeof(error)) { 629 wpa_printf(MSG_INFO, "RSN: No Error KDE in SMK Error"); 630 return -1; 631 } 632 633 if (kde.mac_addr && kde.mac_addr_len >= ETH_ALEN) 634 os_memcpy(peer, kde.mac_addr, ETH_ALEN); 635 else 636 os_memset(peer, 0, ETH_ALEN); 637 os_memcpy(&error, kde.error, sizeof(error)); 638 error_type = be_to_host16(error.error_type); 639 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, 640 "RSN: SMK Error KDE received: MUI %d error_type %d peer " 641 MACSTR, 642 be_to_host16(error.mui), error_type, 643 MAC2STR(peer)); 644 645 if (kde.mac_addr && 646 (error_type == STK_ERR_STA_NR || error_type == STK_ERR_STA_NRSN || 647 error_type == STK_ERR_CPHR_NS)) { 648 struct wpa_peerkey *peerkey; 649 650 for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) { 651 if (os_memcmp(peerkey->addr, kde.mac_addr, ETH_ALEN) == 652 0) 653 break; 654 } 655 if (peerkey == NULL) { 656 wpa_printf(MSG_DEBUG, "RSN: No matching SMK handshake " 657 "found for SMK Error"); 658 return -1; 659 } 660 /* TODO: abort SMK/STK handshake and remove all related keys */ 661 } 662 663 return 0; 664 } 665 666 667 static void wpa_supplicant_process_stk_1_of_4(struct wpa_sm *sm, 668 struct wpa_peerkey *peerkey, 669 const struct wpa_eapol_key *key, 670 u16 ver) 671 { 672 struct wpa_eapol_ie_parse ie; 673 const u8 *kde; 674 size_t len, kde_buf_len; 675 struct wpa_ptk *stk; 676 u8 buf[8], *kde_buf, *pos; 677 be32 lifetime; 678 679 wpa_printf(MSG_DEBUG, "RSN: RX message 1 of STK 4-Way Handshake from " 680 MACSTR " (ver=%d)", MAC2STR(peerkey->addr), ver); 681 682 os_memset(&ie, 0, sizeof(ie)); 683 684 /* RSN: msg 1/4 should contain SMKID for the selected SMK */ 685 kde = (const u8 *) (key + 1); 686 len = WPA_GET_BE16(key->key_data_length); 687 wpa_hexdump(MSG_DEBUG, "RSN: msg 1/4 key data", kde, len); 688 if (wpa_supplicant_parse_ies(kde, len, &ie) < 0 || ie.pmkid == NULL) { 689 wpa_printf(MSG_DEBUG, "RSN: No SMKID in STK 1/4"); 690 return; 691 } 692 if (os_memcmp(ie.pmkid, peerkey->smkid, PMKID_LEN) != 0) { 693 wpa_hexdump(MSG_DEBUG, "RSN: Unknown SMKID in STK 1/4", 694 ie.pmkid, PMKID_LEN); 695 return; 696 } 697 698 if (random_get_bytes(peerkey->pnonce, WPA_NONCE_LEN)) { 699 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 700 "RSN: Failed to get random data for PNonce"); 701 return; 702 } 703 wpa_hexdump(MSG_DEBUG, "WPA: Renewed PNonce", 704 peerkey->pnonce, WPA_NONCE_LEN); 705 706 /* Calculate STK which will be stored as a temporary STK until it has 707 * been verified when processing message 3/4. */ 708 stk = &peerkey->tstk; 709 wpa_pmk_to_ptk(peerkey->smk, PMK_LEN, "Peer key expansion", 710 sm->own_addr, peerkey->addr, 711 peerkey->pnonce, key->key_nonce, 712 (u8 *) stk, sizeof(*stk), 713 peerkey->use_sha256); 714 /* Supplicant: swap tx/rx Mic keys */ 715 os_memcpy(buf, stk->u.auth.tx_mic_key, 8); 716 os_memcpy(stk->u.auth.tx_mic_key, stk->u.auth.rx_mic_key, 8); 717 os_memcpy(stk->u.auth.rx_mic_key, buf, 8); 718 peerkey->tstk_set = 1; 719 720 kde_buf_len = peerkey->rsnie_p_len + 721 2 + RSN_SELECTOR_LEN + sizeof(lifetime) + 722 2 + RSN_SELECTOR_LEN + PMKID_LEN; 723 kde_buf = os_malloc(kde_buf_len); 724 if (kde_buf == NULL) 725 return; 726 pos = kde_buf; 727 pos = wpa_add_ie(pos, peerkey->rsnie_p, peerkey->rsnie_p_len); 728 lifetime = host_to_be32(peerkey->lifetime); 729 pos = wpa_add_kde(pos, RSN_KEY_DATA_LIFETIME, 730 (u8 *) &lifetime, sizeof(lifetime)); 731 wpa_add_kde(pos, RSN_KEY_DATA_PMKID, peerkey->smkid, PMKID_LEN); 732 733 if (wpa_supplicant_send_2_of_4(sm, peerkey->addr, key, ver, 734 peerkey->pnonce, kde_buf, kde_buf_len, 735 stk)) { 736 os_free(kde_buf); 737 return; 738 } 739 os_free(kde_buf); 740 741 os_memcpy(peerkey->inonce, key->key_nonce, WPA_NONCE_LEN); 742 } 743 744 745 static void wpa_supplicant_update_smk_lifetime(struct wpa_sm *sm, 746 struct wpa_peerkey *peerkey, 747 struct wpa_eapol_ie_parse *kde) 748 { 749 u32 lifetime; 750 struct os_time now; 751 752 if (kde->lifetime == NULL || kde->lifetime_len < sizeof(lifetime)) 753 return; 754 755 lifetime = WPA_GET_BE32(kde->lifetime); 756 757 if (lifetime >= peerkey->lifetime) { 758 wpa_printf(MSG_DEBUG, "RSN: Peer used SMK lifetime %u seconds " 759 "which is larger than or equal to own value %u " 760 "seconds - ignored", lifetime, peerkey->lifetime); 761 return; 762 } 763 764 wpa_printf(MSG_DEBUG, "RSN: Peer used shorter SMK lifetime %u seconds " 765 "(own was %u seconds) - updated", 766 lifetime, peerkey->lifetime); 767 peerkey->lifetime = lifetime; 768 769 os_get_time(&now); 770 peerkey->expiration = now.sec + lifetime; 771 eloop_cancel_timeout(wpa_supplicant_smk_timeout, sm, peerkey); 772 eloop_register_timeout(lifetime, 0, wpa_supplicant_smk_timeout, 773 sm, peerkey); 774 } 775 776 777 static void wpa_supplicant_process_stk_2_of_4(struct wpa_sm *sm, 778 struct wpa_peerkey *peerkey, 779 const struct wpa_eapol_key *key, 780 u16 ver) 781 { 782 struct wpa_eapol_ie_parse kde; 783 const u8 *keydata; 784 size_t len; 785 786 wpa_printf(MSG_DEBUG, "RSN: RX message 2 of STK 4-Way Handshake from " 787 MACSTR " (ver=%d)", MAC2STR(peerkey->addr), ver); 788 789 os_memset(&kde, 0, sizeof(kde)); 790 791 /* RSN: msg 2/4 should contain SMKID for the selected SMK and RSN IE 792 * from the peer. It may also include Lifetime KDE. */ 793 keydata = (const u8 *) (key + 1); 794 len = WPA_GET_BE16(key->key_data_length); 795 wpa_hexdump(MSG_DEBUG, "RSN: msg 2/4 key data", keydata, len); 796 if (wpa_supplicant_parse_ies(keydata, len, &kde) < 0 || 797 kde.pmkid == NULL || kde.rsn_ie == NULL) { 798 wpa_printf(MSG_DEBUG, "RSN: No SMKID or RSN IE in STK 2/4"); 799 return; 800 } 801 802 if (os_memcmp(kde.pmkid, peerkey->smkid, PMKID_LEN) != 0) { 803 wpa_hexdump(MSG_DEBUG, "RSN: Unknown SMKID in STK 2/4", 804 kde.pmkid, PMKID_LEN); 805 return; 806 } 807 808 if (kde.rsn_ie_len != peerkey->rsnie_p_len || 809 os_memcmp(kde.rsn_ie, peerkey->rsnie_p, kde.rsn_ie_len) != 0) { 810 wpa_printf(MSG_INFO, "RSN: Peer RSN IE in SMK and STK " 811 "handshakes did not match"); 812 wpa_hexdump(MSG_DEBUG, "RSN: Peer RSN IE in SMK handshake", 813 peerkey->rsnie_p, peerkey->rsnie_p_len); 814 wpa_hexdump(MSG_DEBUG, "RSN: Peer RSN IE in STK handshake", 815 kde.rsn_ie, kde.rsn_ie_len); 816 return; 817 } 818 819 wpa_supplicant_update_smk_lifetime(sm, peerkey, &kde); 820 821 wpa_supplicant_send_stk_3_of_4(sm, peerkey); 822 os_memcpy(peerkey->pnonce, key->key_nonce, WPA_NONCE_LEN); 823 } 824 825 826 static void wpa_supplicant_process_stk_3_of_4(struct wpa_sm *sm, 827 struct wpa_peerkey *peerkey, 828 const struct wpa_eapol_key *key, 829 u16 ver) 830 { 831 struct wpa_eapol_ie_parse kde; 832 const u8 *keydata; 833 size_t len, key_len; 834 const u8 *_key; 835 u8 key_buf[32], rsc[6]; 836 837 wpa_printf(MSG_DEBUG, "RSN: RX message 3 of STK 4-Way Handshake from " 838 MACSTR " (ver=%d)", MAC2STR(peerkey->addr), ver); 839 840 os_memset(&kde, 0, sizeof(kde)); 841 842 /* RSN: msg 3/4 should contain Initiator RSN IE. It may also include 843 * Lifetime KDE. */ 844 keydata = (const u8 *) (key + 1); 845 len = WPA_GET_BE16(key->key_data_length); 846 wpa_hexdump(MSG_DEBUG, "RSN: msg 3/4 key data", keydata, len); 847 if (wpa_supplicant_parse_ies(keydata, len, &kde) < 0) { 848 wpa_printf(MSG_DEBUG, "RSN: Failed to parse key data in " 849 "STK 3/4"); 850 return; 851 } 852 853 if (kde.rsn_ie_len != peerkey->rsnie_i_len || 854 os_memcmp(kde.rsn_ie, peerkey->rsnie_i, kde.rsn_ie_len) != 0) { 855 wpa_printf(MSG_INFO, "RSN: Initiator RSN IE in SMK and STK " 856 "handshakes did not match"); 857 wpa_hexdump(MSG_DEBUG, "RSN: Initiator RSN IE in SMK " 858 "handshake", 859 peerkey->rsnie_i, peerkey->rsnie_i_len); 860 wpa_hexdump(MSG_DEBUG, "RSN: Initiator RSN IE in STK " 861 "handshake", 862 kde.rsn_ie, kde.rsn_ie_len); 863 return; 864 } 865 866 if (os_memcmp(peerkey->inonce, key->key_nonce, WPA_NONCE_LEN) != 0) { 867 wpa_printf(MSG_WARNING, "RSN: INonce from message 1 of STK " 868 "4-Way Handshake differs from 3 of STK 4-Way " 869 "Handshake - drop packet (src=" MACSTR ")", 870 MAC2STR(peerkey->addr)); 871 return; 872 } 873 874 wpa_supplicant_update_smk_lifetime(sm, peerkey, &kde); 875 876 if (wpa_supplicant_send_4_of_4(sm, peerkey->addr, key, ver, 877 WPA_GET_BE16(key->key_info), 878 NULL, 0, &peerkey->stk)) 879 return; 880 881 _key = (u8 *) peerkey->stk.tk1; 882 if (peerkey->cipher == WPA_CIPHER_TKIP) { 883 /* Swap Tx/Rx keys for Michael MIC */ 884 os_memcpy(key_buf, _key, 16); 885 os_memcpy(key_buf + 16, peerkey->stk.u.auth.rx_mic_key, 8); 886 os_memcpy(key_buf + 24, peerkey->stk.u.auth.tx_mic_key, 8); 887 _key = key_buf; 888 key_len = 32; 889 } else 890 key_len = 16; 891 892 os_memset(rsc, 0, 6); 893 if (wpa_sm_set_key(sm, peerkey->cipher, peerkey->addr, 0, 1, 894 rsc, sizeof(rsc), _key, key_len) < 0) { 895 wpa_printf(MSG_WARNING, "RSN: Failed to set STK to the " 896 "driver."); 897 return; 898 } 899 } 900 901 902 static void wpa_supplicant_process_stk_4_of_4(struct wpa_sm *sm, 903 struct wpa_peerkey *peerkey, 904 const struct wpa_eapol_key *key, 905 u16 ver) 906 { 907 u8 rsc[6]; 908 909 wpa_printf(MSG_DEBUG, "RSN: RX message 4 of STK 4-Way Handshake from " 910 MACSTR " (ver=%d)", MAC2STR(peerkey->addr), ver); 911 912 os_memset(rsc, 0, 6); 913 if (wpa_sm_set_key(sm, peerkey->cipher, peerkey->addr, 0, 1, 914 rsc, sizeof(rsc), (u8 *) peerkey->stk.tk1, 915 peerkey->cipher == WPA_CIPHER_TKIP ? 32 : 16) < 0) { 916 wpa_printf(MSG_WARNING, "RSN: Failed to set STK to the " 917 "driver."); 918 return; 919 } 920 } 921 922 923 /** 924 * peerkey_verify_eapol_key_mic - Verify PeerKey MIC 925 * @sm: Pointer to WPA state machine data from wpa_sm_init() 926 * @peerkey: Pointer to the PeerKey data for the peer 927 * @key: Pointer to the EAPOL-Key frame header 928 * @ver: Version bits from EAPOL-Key Key Info 929 * @buf: Pointer to the beginning of EAPOL-Key frame 930 * @len: Length of the EAPOL-Key frame 931 * Returns: 0 on success, -1 on failure 932 */ 933 int peerkey_verify_eapol_key_mic(struct wpa_sm *sm, 934 struct wpa_peerkey *peerkey, 935 struct wpa_eapol_key *key, u16 ver, 936 const u8 *buf, size_t len) 937 { 938 u8 mic[16]; 939 int ok = 0; 940 941 if (peerkey->initiator && !peerkey->stk_set) { 942 wpa_pmk_to_ptk(peerkey->smk, PMK_LEN, "Peer key expansion", 943 sm->own_addr, peerkey->addr, 944 peerkey->inonce, key->key_nonce, 945 (u8 *) &peerkey->stk, sizeof(peerkey->stk), 946 peerkey->use_sha256); 947 peerkey->stk_set = 1; 948 } 949 950 os_memcpy(mic, key->key_mic, 16); 951 if (peerkey->tstk_set) { 952 os_memset(key->key_mic, 0, 16); 953 wpa_eapol_key_mic(peerkey->tstk.kck, ver, buf, len, 954 key->key_mic); 955 if (os_memcmp(mic, key->key_mic, 16) != 0) { 956 wpa_printf(MSG_WARNING, "RSN: Invalid EAPOL-Key MIC " 957 "when using TSTK - ignoring TSTK"); 958 } else { 959 ok = 1; 960 peerkey->tstk_set = 0; 961 peerkey->stk_set = 1; 962 os_memcpy(&peerkey->stk, &peerkey->tstk, 963 sizeof(peerkey->stk)); 964 } 965 } 966 967 if (!ok && peerkey->stk_set) { 968 os_memset(key->key_mic, 0, 16); 969 wpa_eapol_key_mic(peerkey->stk.kck, ver, buf, len, 970 key->key_mic); 971 if (os_memcmp(mic, key->key_mic, 16) != 0) { 972 wpa_printf(MSG_WARNING, "RSN: Invalid EAPOL-Key MIC " 973 "- dropping packet"); 974 return -1; 975 } 976 ok = 1; 977 } 978 979 if (!ok) { 980 wpa_printf(MSG_WARNING, "RSN: Could not verify EAPOL-Key MIC " 981 "- dropping packet"); 982 return -1; 983 } 984 985 os_memcpy(peerkey->replay_counter, key->replay_counter, 986 WPA_REPLAY_COUNTER_LEN); 987 peerkey->replay_counter_set = 1; 988 return 0; 989 } 990 991 992 /** 993 * wpa_sm_stkstart - Send EAPOL-Key Request for STK handshake (STK M1) 994 * @sm: Pointer to WPA state machine data from wpa_sm_init() 995 * @peer: MAC address of the peer STA 996 * Returns: 0 on success, or -1 on failure 997 * 998 * Send an EAPOL-Key Request to the current authenticator to start STK 999 * handshake with the peer. 1000 */ 1001 int wpa_sm_stkstart(struct wpa_sm *sm, const u8 *peer) 1002 { 1003 size_t rlen, kde_len; 1004 struct wpa_eapol_key *req; 1005 int key_info, ver; 1006 u8 bssid[ETH_ALEN], *rbuf, *pos, *count_pos; 1007 u16 count; 1008 struct rsn_ie_hdr *hdr; 1009 struct wpa_peerkey *peerkey; 1010 struct wpa_ie_data ie; 1011 1012 if (sm->proto != WPA_PROTO_RSN || !sm->ptk_set || !sm->peerkey_enabled) 1013 return -1; 1014 1015 if (sm->ap_rsn_ie && 1016 wpa_parse_wpa_ie_rsn(sm->ap_rsn_ie, sm->ap_rsn_ie_len, &ie) == 0 && 1017 !(ie.capabilities & WPA_CAPABILITY_PEERKEY_ENABLED)) { 1018 wpa_printf(MSG_DEBUG, "RSN: Current AP does not support STK"); 1019 return -1; 1020 } 1021 1022 if (sm->pairwise_cipher != WPA_CIPHER_TKIP) 1023 ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES; 1024 else 1025 ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4; 1026 1027 if (wpa_sm_get_bssid(sm, bssid) < 0) { 1028 wpa_printf(MSG_WARNING, "Failed to read BSSID for EAPOL-Key " 1029 "SMK M1"); 1030 return -1; 1031 } 1032 1033 /* TODO: find existing entry and if found, use that instead of adding 1034 * a new one */ 1035 peerkey = os_zalloc(sizeof(*peerkey)); 1036 if (peerkey == NULL) 1037 return -1; 1038 peerkey->initiator = 1; 1039 os_memcpy(peerkey->addr, peer, ETH_ALEN); 1040 #ifdef CONFIG_IEEE80211W 1041 if (wpa_key_mgmt_sha256(sm->key_mgmt)) 1042 peerkey->use_sha256 = 1; 1043 #endif /* CONFIG_IEEE80211W */ 1044 1045 /* SMK M1: 1046 * EAPOL-Key(S=1, M=1, A=0, I=0, K=0, SM=1, KeyRSC=0, Nonce=INonce, 1047 * MIC=MIC, DataKDs=(RSNIE_I, MAC_P KDE)) 1048 */ 1049 1050 hdr = (struct rsn_ie_hdr *) peerkey->rsnie_i; 1051 hdr->elem_id = WLAN_EID_RSN; 1052 WPA_PUT_LE16(hdr->version, RSN_VERSION); 1053 pos = (u8 *) (hdr + 1); 1054 /* Group Suite can be anything for SMK RSN IE; receiver will just 1055 * ignore it. */ 1056 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP); 1057 pos += RSN_SELECTOR_LEN; 1058 count_pos = pos; 1059 pos += 2; 1060 1061 count = rsn_cipher_put_suites(pos, sm->allowed_pairwise_cipher); 1062 pos += count * RSN_SELECTOR_LEN; 1063 WPA_PUT_LE16(count_pos, count); 1064 1065 hdr->len = (pos - peerkey->rsnie_i) - 2; 1066 peerkey->rsnie_i_len = pos - peerkey->rsnie_i; 1067 wpa_hexdump(MSG_DEBUG, "WPA: RSN IE for SMK handshake", 1068 peerkey->rsnie_i, peerkey->rsnie_i_len); 1069 1070 kde_len = peerkey->rsnie_i_len + 2 + RSN_SELECTOR_LEN + ETH_ALEN; 1071 1072 rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL, 1073 sizeof(*req) + kde_len, &rlen, 1074 (void *) &req); 1075 if (rbuf == NULL) { 1076 wpa_supplicant_peerkey_free(sm, peerkey); 1077 return -1; 1078 } 1079 1080 req->type = EAPOL_KEY_TYPE_RSN; 1081 key_info = WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_MIC | 1082 WPA_KEY_INFO_SECURE | WPA_KEY_INFO_REQUEST | ver; 1083 WPA_PUT_BE16(req->key_info, key_info); 1084 WPA_PUT_BE16(req->key_length, 0); 1085 os_memcpy(req->replay_counter, sm->request_counter, 1086 WPA_REPLAY_COUNTER_LEN); 1087 inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN); 1088 1089 if (random_get_bytes(peerkey->inonce, WPA_NONCE_LEN)) { 1090 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, 1091 "WPA: Failed to get random data for INonce"); 1092 os_free(rbuf); 1093 wpa_supplicant_peerkey_free(sm, peerkey); 1094 return -1; 1095 } 1096 os_memcpy(req->key_nonce, peerkey->inonce, WPA_NONCE_LEN); 1097 wpa_hexdump(MSG_DEBUG, "WPA: INonce for SMK handshake", 1098 req->key_nonce, WPA_NONCE_LEN); 1099 1100 WPA_PUT_BE16(req->key_data_length, (u16) kde_len); 1101 pos = (u8 *) (req + 1); 1102 1103 /* Initiator RSN IE */ 1104 pos = wpa_add_ie(pos, peerkey->rsnie_i, peerkey->rsnie_i_len); 1105 /* Peer MAC address KDE */ 1106 wpa_add_kde(pos, RSN_KEY_DATA_MAC_ADDR, peer, ETH_ALEN); 1107 1108 wpa_printf(MSG_INFO, "RSN: Sending EAPOL-Key SMK M1 Request (peer " 1109 MACSTR ")", MAC2STR(peer)); 1110 wpa_eapol_key_send(sm, sm->ptk.kck, ver, bssid, ETH_P_EAPOL, 1111 rbuf, rlen, req->key_mic); 1112 1113 peerkey->next = sm->peerkey; 1114 sm->peerkey = peerkey; 1115 1116 return 0; 1117 } 1118 1119 1120 /** 1121 * peerkey_deinit - Free PeerKey values 1122 * @sm: Pointer to WPA state machine data from wpa_sm_init() 1123 */ 1124 void peerkey_deinit(struct wpa_sm *sm) 1125 { 1126 struct wpa_peerkey *prev, *peerkey = sm->peerkey; 1127 while (peerkey) { 1128 prev = peerkey; 1129 peerkey = peerkey->next; 1130 os_free(prev); 1131 } 1132 sm->peerkey = NULL; 1133 } 1134 1135 1136 void peerkey_rx_eapol_4way(struct wpa_sm *sm, struct wpa_peerkey *peerkey, 1137 struct wpa_eapol_key *key, u16 key_info, u16 ver) 1138 { 1139 if ((key_info & (WPA_KEY_INFO_MIC | WPA_KEY_INFO_ACK)) == 1140 (WPA_KEY_INFO_MIC | WPA_KEY_INFO_ACK)) { 1141 /* 3/4 STK 4-Way Handshake */ 1142 wpa_supplicant_process_stk_3_of_4(sm, peerkey, key, ver); 1143 } else if (key_info & WPA_KEY_INFO_ACK) { 1144 /* 1/4 STK 4-Way Handshake */ 1145 wpa_supplicant_process_stk_1_of_4(sm, peerkey, key, ver); 1146 } else if (key_info & WPA_KEY_INFO_SECURE) { 1147 /* 4/4 STK 4-Way Handshake */ 1148 wpa_supplicant_process_stk_4_of_4(sm, peerkey, key, ver); 1149 } else { 1150 /* 2/4 STK 4-Way Handshake */ 1151 wpa_supplicant_process_stk_2_of_4(sm, peerkey, key, ver); 1152 } 1153 } 1154 1155 1156 void peerkey_rx_eapol_smk(struct wpa_sm *sm, const u8 *src_addr, 1157 struct wpa_eapol_key *key, size_t extra_len, 1158 u16 key_info, u16 ver) 1159 { 1160 if (key_info & WPA_KEY_INFO_ERROR) { 1161 /* SMK Error */ 1162 wpa_supplicant_process_smk_error(sm, src_addr, key, extra_len); 1163 } else if (key_info & WPA_KEY_INFO_ACK) { 1164 /* SMK M2 */ 1165 wpa_supplicant_process_smk_m2(sm, src_addr, key, extra_len, 1166 ver); 1167 } else { 1168 /* SMK M4 or M5 */ 1169 wpa_supplicant_process_smk_m45(sm, src_addr, key, extra_len, 1170 ver); 1171 } 1172 } 1173 1174 #endif /* CONFIG_PEERKEY */ 1175
