1 /* 2 * hostapd - WPA/RSN IE and KDE definitions 3 * Copyright (c) 2004-2008, 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 "utils/includes.h" 10 11 #include "utils/common.h" 12 #include "common/ieee802_11_defs.h" 13 #include "eapol_auth/eapol_auth_sm.h" 14 #include "ap_config.h" 15 #include "ieee802_11.h" 16 #include "wpa_auth.h" 17 #include "pmksa_cache_auth.h" 18 #include "wpa_auth_ie.h" 19 #include "wpa_auth_i.h" 20 21 22 #ifdef CONFIG_RSN_TESTING 23 int rsn_testing = 0; 24 #endif /* CONFIG_RSN_TESTING */ 25 26 27 static int wpa_write_wpa_ie(struct wpa_auth_config *conf, u8 *buf, size_t len) 28 { 29 struct wpa_ie_hdr *hdr; 30 int num_suites; 31 u8 *pos, *count; 32 u32 suite; 33 34 hdr = (struct wpa_ie_hdr *) buf; 35 hdr->elem_id = WLAN_EID_VENDOR_SPECIFIC; 36 RSN_SELECTOR_PUT(hdr->oui, WPA_OUI_TYPE); 37 WPA_PUT_LE16(hdr->version, WPA_VERSION); 38 pos = (u8 *) (hdr + 1); 39 40 suite = wpa_cipher_to_suite(WPA_PROTO_WPA, conf->wpa_group); 41 if (suite == 0) { 42 wpa_printf(MSG_DEBUG, "Invalid group cipher (%d).", 43 conf->wpa_group); 44 return -1; 45 } 46 RSN_SELECTOR_PUT(pos, suite); 47 pos += WPA_SELECTOR_LEN; 48 49 count = pos; 50 pos += 2; 51 52 num_suites = wpa_cipher_put_suites(pos, conf->wpa_pairwise); 53 if (num_suites == 0) { 54 wpa_printf(MSG_DEBUG, "Invalid pairwise cipher (%d).", 55 conf->wpa_pairwise); 56 return -1; 57 } 58 pos += num_suites * WPA_SELECTOR_LEN; 59 WPA_PUT_LE16(count, num_suites); 60 61 num_suites = 0; 62 count = pos; 63 pos += 2; 64 65 if (conf->wpa_key_mgmt & WPA_KEY_MGMT_IEEE8021X) { 66 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_UNSPEC_802_1X); 67 pos += WPA_SELECTOR_LEN; 68 num_suites++; 69 } 70 if (conf->wpa_key_mgmt & WPA_KEY_MGMT_PSK) { 71 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X); 72 pos += WPA_SELECTOR_LEN; 73 num_suites++; 74 } 75 76 if (num_suites == 0) { 77 wpa_printf(MSG_DEBUG, "Invalid key management type (%d).", 78 conf->wpa_key_mgmt); 79 return -1; 80 } 81 WPA_PUT_LE16(count, num_suites); 82 83 /* WPA Capabilities; use defaults, so no need to include it */ 84 85 hdr->len = (pos - buf) - 2; 86 87 return pos - buf; 88 } 89 90 91 int wpa_write_rsn_ie(struct wpa_auth_config *conf, u8 *buf, size_t len, 92 const u8 *pmkid) 93 { 94 struct rsn_ie_hdr *hdr; 95 int num_suites, res; 96 u8 *pos, *count; 97 u16 capab; 98 u32 suite; 99 100 hdr = (struct rsn_ie_hdr *) buf; 101 hdr->elem_id = WLAN_EID_RSN; 102 WPA_PUT_LE16(hdr->version, RSN_VERSION); 103 pos = (u8 *) (hdr + 1); 104 105 suite = wpa_cipher_to_suite(WPA_PROTO_RSN, conf->wpa_group); 106 if (suite == 0) { 107 wpa_printf(MSG_DEBUG, "Invalid group cipher (%d).", 108 conf->wpa_group); 109 return -1; 110 } 111 RSN_SELECTOR_PUT(pos, suite); 112 pos += RSN_SELECTOR_LEN; 113 114 num_suites = 0; 115 count = pos; 116 pos += 2; 117 118 #ifdef CONFIG_RSN_TESTING 119 if (rsn_testing) { 120 RSN_SELECTOR_PUT(pos, RSN_SELECTOR(0x12, 0x34, 0x56, 1)); 121 pos += RSN_SELECTOR_LEN; 122 num_suites++; 123 } 124 #endif /* CONFIG_RSN_TESTING */ 125 126 res = rsn_cipher_put_suites(pos, conf->rsn_pairwise); 127 num_suites += res; 128 pos += res * RSN_SELECTOR_LEN; 129 130 #ifdef CONFIG_RSN_TESTING 131 if (rsn_testing) { 132 RSN_SELECTOR_PUT(pos, RSN_SELECTOR(0x12, 0x34, 0x56, 2)); 133 pos += RSN_SELECTOR_LEN; 134 num_suites++; 135 } 136 #endif /* CONFIG_RSN_TESTING */ 137 138 if (num_suites == 0) { 139 wpa_printf(MSG_DEBUG, "Invalid pairwise cipher (%d).", 140 conf->rsn_pairwise); 141 return -1; 142 } 143 WPA_PUT_LE16(count, num_suites); 144 145 num_suites = 0; 146 count = pos; 147 pos += 2; 148 149 #ifdef CONFIG_RSN_TESTING 150 if (rsn_testing) { 151 RSN_SELECTOR_PUT(pos, RSN_SELECTOR(0x12, 0x34, 0x56, 1)); 152 pos += RSN_SELECTOR_LEN; 153 num_suites++; 154 } 155 #endif /* CONFIG_RSN_TESTING */ 156 157 if (conf->wpa_key_mgmt & WPA_KEY_MGMT_IEEE8021X) { 158 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_UNSPEC_802_1X); 159 pos += RSN_SELECTOR_LEN; 160 num_suites++; 161 } 162 if (conf->wpa_key_mgmt & WPA_KEY_MGMT_PSK) { 163 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X); 164 pos += RSN_SELECTOR_LEN; 165 num_suites++; 166 } 167 #ifdef CONFIG_IEEE80211R 168 if (conf->wpa_key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X) { 169 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X); 170 pos += RSN_SELECTOR_LEN; 171 num_suites++; 172 } 173 if (conf->wpa_key_mgmt & WPA_KEY_MGMT_FT_PSK) { 174 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK); 175 pos += RSN_SELECTOR_LEN; 176 num_suites++; 177 } 178 #endif /* CONFIG_IEEE80211R */ 179 #ifdef CONFIG_IEEE80211W 180 if (conf->wpa_key_mgmt & WPA_KEY_MGMT_IEEE8021X_SHA256) { 181 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SHA256); 182 pos += RSN_SELECTOR_LEN; 183 num_suites++; 184 } 185 if (conf->wpa_key_mgmt & WPA_KEY_MGMT_PSK_SHA256) { 186 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_SHA256); 187 pos += RSN_SELECTOR_LEN; 188 num_suites++; 189 } 190 #endif /* CONFIG_IEEE80211W */ 191 #ifdef CONFIG_SAE 192 if (conf->wpa_key_mgmt & WPA_KEY_MGMT_SAE) { 193 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_SAE); 194 pos += RSN_SELECTOR_LEN; 195 num_suites++; 196 } 197 if (conf->wpa_key_mgmt & WPA_KEY_MGMT_FT_SAE) { 198 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE); 199 pos += RSN_SELECTOR_LEN; 200 num_suites++; 201 } 202 #endif /* CONFIG_SAE */ 203 204 #ifdef CONFIG_RSN_TESTING 205 if (rsn_testing) { 206 RSN_SELECTOR_PUT(pos, RSN_SELECTOR(0x12, 0x34, 0x56, 2)); 207 pos += RSN_SELECTOR_LEN; 208 num_suites++; 209 } 210 #endif /* CONFIG_RSN_TESTING */ 211 212 if (num_suites == 0) { 213 wpa_printf(MSG_DEBUG, "Invalid key management type (%d).", 214 conf->wpa_key_mgmt); 215 return -1; 216 } 217 WPA_PUT_LE16(count, num_suites); 218 219 /* RSN Capabilities */ 220 capab = 0; 221 if (conf->rsn_preauth) 222 capab |= WPA_CAPABILITY_PREAUTH; 223 if (conf->peerkey) 224 capab |= WPA_CAPABILITY_PEERKEY_ENABLED; 225 if (conf->wmm_enabled) { 226 /* 4 PTKSA replay counters when using WMM */ 227 capab |= (RSN_NUM_REPLAY_COUNTERS_16 << 2); 228 } 229 #ifdef CONFIG_IEEE80211W 230 if (conf->ieee80211w != NO_MGMT_FRAME_PROTECTION) { 231 capab |= WPA_CAPABILITY_MFPC; 232 if (conf->ieee80211w == MGMT_FRAME_PROTECTION_REQUIRED) 233 capab |= WPA_CAPABILITY_MFPR; 234 } 235 #endif /* CONFIG_IEEE80211W */ 236 #ifdef CONFIG_RSN_TESTING 237 if (rsn_testing) 238 capab |= BIT(8) | BIT(14) | BIT(15); 239 #endif /* CONFIG_RSN_TESTING */ 240 WPA_PUT_LE16(pos, capab); 241 pos += 2; 242 243 if (pmkid) { 244 if (pos + 2 + PMKID_LEN > buf + len) 245 return -1; 246 /* PMKID Count */ 247 WPA_PUT_LE16(pos, 1); 248 pos += 2; 249 os_memcpy(pos, pmkid, PMKID_LEN); 250 pos += PMKID_LEN; 251 } 252 253 #ifdef CONFIG_IEEE80211W 254 if (conf->ieee80211w != NO_MGMT_FRAME_PROTECTION) { 255 if (pos + 2 + 4 > buf + len) 256 return -1; 257 if (pmkid == NULL) { 258 /* PMKID Count */ 259 WPA_PUT_LE16(pos, 0); 260 pos += 2; 261 } 262 263 /* Management Group Cipher Suite */ 264 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC); 265 pos += RSN_SELECTOR_LEN; 266 } 267 #endif /* CONFIG_IEEE80211W */ 268 269 #ifdef CONFIG_RSN_TESTING 270 if (rsn_testing) { 271 /* 272 * Fill in any defined fields and add extra data to the end of 273 * the element. 274 */ 275 int pmkid_count_set = pmkid != NULL; 276 if (conf->ieee80211w != NO_MGMT_FRAME_PROTECTION) 277 pmkid_count_set = 1; 278 /* PMKID Count */ 279 WPA_PUT_LE16(pos, 0); 280 pos += 2; 281 if (conf->ieee80211w == NO_MGMT_FRAME_PROTECTION) { 282 /* Management Group Cipher Suite */ 283 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC); 284 pos += RSN_SELECTOR_LEN; 285 } 286 287 os_memset(pos, 0x12, 17); 288 pos += 17; 289 } 290 #endif /* CONFIG_RSN_TESTING */ 291 292 hdr->len = (pos - buf) - 2; 293 294 return pos - buf; 295 } 296 297 298 int wpa_auth_gen_wpa_ie(struct wpa_authenticator *wpa_auth) 299 { 300 u8 *pos, buf[128]; 301 int res; 302 303 pos = buf; 304 305 if (wpa_auth->conf.wpa & WPA_PROTO_RSN) { 306 res = wpa_write_rsn_ie(&wpa_auth->conf, 307 pos, buf + sizeof(buf) - pos, NULL); 308 if (res < 0) 309 return res; 310 pos += res; 311 } 312 #ifdef CONFIG_IEEE80211R 313 if (wpa_key_mgmt_ft(wpa_auth->conf.wpa_key_mgmt)) { 314 res = wpa_write_mdie(&wpa_auth->conf, pos, 315 buf + sizeof(buf) - pos); 316 if (res < 0) 317 return res; 318 pos += res; 319 } 320 #endif /* CONFIG_IEEE80211R */ 321 if (wpa_auth->conf.wpa & WPA_PROTO_WPA) { 322 res = wpa_write_wpa_ie(&wpa_auth->conf, 323 pos, buf + sizeof(buf) - pos); 324 if (res < 0) 325 return res; 326 pos += res; 327 } 328 329 os_free(wpa_auth->wpa_ie); 330 wpa_auth->wpa_ie = os_malloc(pos - buf); 331 if (wpa_auth->wpa_ie == NULL) 332 return -1; 333 os_memcpy(wpa_auth->wpa_ie, buf, pos - buf); 334 wpa_auth->wpa_ie_len = pos - buf; 335 336 return 0; 337 } 338 339 340 u8 * wpa_add_kde(u8 *pos, u32 kde, const u8 *data, size_t data_len, 341 const u8 *data2, size_t data2_len) 342 { 343 *pos++ = WLAN_EID_VENDOR_SPECIFIC; 344 *pos++ = RSN_SELECTOR_LEN + data_len + data2_len; 345 RSN_SELECTOR_PUT(pos, kde); 346 pos += RSN_SELECTOR_LEN; 347 os_memcpy(pos, data, data_len); 348 pos += data_len; 349 if (data2) { 350 os_memcpy(pos, data2, data2_len); 351 pos += data2_len; 352 } 353 return pos; 354 } 355 356 357 struct wpa_auth_okc_iter_data { 358 struct rsn_pmksa_cache_entry *pmksa; 359 const u8 *aa; 360 const u8 *spa; 361 const u8 *pmkid; 362 }; 363 364 365 static int wpa_auth_okc_iter(struct wpa_authenticator *a, void *ctx) 366 { 367 struct wpa_auth_okc_iter_data *data = ctx; 368 data->pmksa = pmksa_cache_get_okc(a->pmksa, data->aa, data->spa, 369 data->pmkid); 370 if (data->pmksa) 371 return 1; 372 return 0; 373 } 374 375 376 int wpa_validate_wpa_ie(struct wpa_authenticator *wpa_auth, 377 struct wpa_state_machine *sm, 378 const u8 *wpa_ie, size_t wpa_ie_len, 379 const u8 *mdie, size_t mdie_len) 380 { 381 struct wpa_ie_data data; 382 int ciphers, key_mgmt, res, version; 383 u32 selector; 384 size_t i; 385 const u8 *pmkid = NULL; 386 387 if (wpa_auth == NULL || sm == NULL) 388 return WPA_NOT_ENABLED; 389 390 if (wpa_ie == NULL || wpa_ie_len < 1) 391 return WPA_INVALID_IE; 392 393 if (wpa_ie[0] == WLAN_EID_RSN) 394 version = WPA_PROTO_RSN; 395 else 396 version = WPA_PROTO_WPA; 397 398 if (!(wpa_auth->conf.wpa & version)) { 399 wpa_printf(MSG_DEBUG, "Invalid WPA proto (%d) from " MACSTR, 400 version, MAC2STR(sm->addr)); 401 return WPA_INVALID_PROTO; 402 } 403 404 if (version == WPA_PROTO_RSN) { 405 res = wpa_parse_wpa_ie_rsn(wpa_ie, wpa_ie_len, &data); 406 407 selector = RSN_AUTH_KEY_MGMT_UNSPEC_802_1X; 408 if (0) { 409 } 410 #ifdef CONFIG_IEEE80211R 411 else if (data.key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X) 412 selector = RSN_AUTH_KEY_MGMT_FT_802_1X; 413 else if (data.key_mgmt & WPA_KEY_MGMT_FT_PSK) 414 selector = RSN_AUTH_KEY_MGMT_FT_PSK; 415 #endif /* CONFIG_IEEE80211R */ 416 #ifdef CONFIG_IEEE80211W 417 else if (data.key_mgmt & WPA_KEY_MGMT_IEEE8021X_SHA256) 418 selector = RSN_AUTH_KEY_MGMT_802_1X_SHA256; 419 else if (data.key_mgmt & WPA_KEY_MGMT_PSK_SHA256) 420 selector = RSN_AUTH_KEY_MGMT_PSK_SHA256; 421 #endif /* CONFIG_IEEE80211W */ 422 #ifdef CONFIG_SAE 423 else if (data.key_mgmt & WPA_KEY_MGMT_SAE) 424 selector = RSN_AUTH_KEY_MGMT_SAE; 425 else if (data.key_mgmt & WPA_KEY_MGMT_FT_SAE) 426 selector = RSN_AUTH_KEY_MGMT_FT_SAE; 427 #endif /* CONFIG_SAE */ 428 else if (data.key_mgmt & WPA_KEY_MGMT_IEEE8021X) 429 selector = RSN_AUTH_KEY_MGMT_UNSPEC_802_1X; 430 else if (data.key_mgmt & WPA_KEY_MGMT_PSK) 431 selector = RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X; 432 wpa_auth->dot11RSNAAuthenticationSuiteSelected = selector; 433 434 selector = wpa_cipher_to_suite(WPA_PROTO_RSN, 435 data.pairwise_cipher); 436 if (!selector) 437 selector = RSN_CIPHER_SUITE_CCMP; 438 wpa_auth->dot11RSNAPairwiseCipherSelected = selector; 439 440 selector = wpa_cipher_to_suite(WPA_PROTO_RSN, 441 data.group_cipher); 442 if (!selector) 443 selector = RSN_CIPHER_SUITE_CCMP; 444 wpa_auth->dot11RSNAGroupCipherSelected = selector; 445 } else { 446 res = wpa_parse_wpa_ie_wpa(wpa_ie, wpa_ie_len, &data); 447 448 selector = WPA_AUTH_KEY_MGMT_UNSPEC_802_1X; 449 if (data.key_mgmt & WPA_KEY_MGMT_IEEE8021X) 450 selector = WPA_AUTH_KEY_MGMT_UNSPEC_802_1X; 451 else if (data.key_mgmt & WPA_KEY_MGMT_PSK) 452 selector = WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X; 453 wpa_auth->dot11RSNAAuthenticationSuiteSelected = selector; 454 455 selector = wpa_cipher_to_suite(WPA_PROTO_WPA, 456 data.pairwise_cipher); 457 if (!selector) 458 selector = RSN_CIPHER_SUITE_TKIP; 459 wpa_auth->dot11RSNAPairwiseCipherSelected = selector; 460 461 selector = wpa_cipher_to_suite(WPA_PROTO_WPA, 462 data.group_cipher); 463 if (!selector) 464 selector = WPA_CIPHER_SUITE_TKIP; 465 wpa_auth->dot11RSNAGroupCipherSelected = selector; 466 } 467 if (res) { 468 wpa_printf(MSG_DEBUG, "Failed to parse WPA/RSN IE from " 469 MACSTR " (res=%d)", MAC2STR(sm->addr), res); 470 wpa_hexdump(MSG_DEBUG, "WPA/RSN IE", wpa_ie, wpa_ie_len); 471 return WPA_INVALID_IE; 472 } 473 474 if (data.group_cipher != wpa_auth->conf.wpa_group) { 475 wpa_printf(MSG_DEBUG, "Invalid WPA group cipher (0x%x) from " 476 MACSTR, data.group_cipher, MAC2STR(sm->addr)); 477 return WPA_INVALID_GROUP; 478 } 479 480 key_mgmt = data.key_mgmt & wpa_auth->conf.wpa_key_mgmt; 481 if (!key_mgmt) { 482 wpa_printf(MSG_DEBUG, "Invalid WPA key mgmt (0x%x) from " 483 MACSTR, data.key_mgmt, MAC2STR(sm->addr)); 484 return WPA_INVALID_AKMP; 485 } 486 if (0) { 487 } 488 #ifdef CONFIG_IEEE80211R 489 else if (key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X) 490 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_IEEE8021X; 491 else if (key_mgmt & WPA_KEY_MGMT_FT_PSK) 492 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_PSK; 493 #endif /* CONFIG_IEEE80211R */ 494 #ifdef CONFIG_IEEE80211W 495 else if (key_mgmt & WPA_KEY_MGMT_IEEE8021X_SHA256) 496 sm->wpa_key_mgmt = WPA_KEY_MGMT_IEEE8021X_SHA256; 497 else if (key_mgmt & WPA_KEY_MGMT_PSK_SHA256) 498 sm->wpa_key_mgmt = WPA_KEY_MGMT_PSK_SHA256; 499 #endif /* CONFIG_IEEE80211W */ 500 #ifdef CONFIG_SAE 501 else if (key_mgmt & WPA_KEY_MGMT_SAE) 502 sm->wpa_key_mgmt = WPA_KEY_MGMT_SAE; 503 else if (key_mgmt & WPA_KEY_MGMT_FT_SAE) 504 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_SAE; 505 #endif /* CONFIG_SAE */ 506 else if (key_mgmt & WPA_KEY_MGMT_IEEE8021X) 507 sm->wpa_key_mgmt = WPA_KEY_MGMT_IEEE8021X; 508 else 509 sm->wpa_key_mgmt = WPA_KEY_MGMT_PSK; 510 511 if (version == WPA_PROTO_RSN) 512 ciphers = data.pairwise_cipher & wpa_auth->conf.rsn_pairwise; 513 else 514 ciphers = data.pairwise_cipher & wpa_auth->conf.wpa_pairwise; 515 if (!ciphers) { 516 wpa_printf(MSG_DEBUG, "Invalid %s pairwise cipher (0x%x) " 517 "from " MACSTR, 518 version == WPA_PROTO_RSN ? "RSN" : "WPA", 519 data.pairwise_cipher, MAC2STR(sm->addr)); 520 return WPA_INVALID_PAIRWISE; 521 } 522 523 #ifdef CONFIG_IEEE80211W 524 if (wpa_auth->conf.ieee80211w == MGMT_FRAME_PROTECTION_REQUIRED) { 525 if (!(data.capabilities & WPA_CAPABILITY_MFPC)) { 526 wpa_printf(MSG_DEBUG, "Management frame protection " 527 "required, but client did not enable it"); 528 return WPA_MGMT_FRAME_PROTECTION_VIOLATION; 529 } 530 531 if (ciphers & WPA_CIPHER_TKIP) { 532 wpa_printf(MSG_DEBUG, "Management frame protection " 533 "cannot use TKIP"); 534 return WPA_MGMT_FRAME_PROTECTION_VIOLATION; 535 } 536 537 if (data.mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC) { 538 wpa_printf(MSG_DEBUG, "Unsupported management group " 539 "cipher %d", data.mgmt_group_cipher); 540 return WPA_INVALID_MGMT_GROUP_CIPHER; 541 } 542 } 543 544 if (wpa_auth->conf.ieee80211w == NO_MGMT_FRAME_PROTECTION || 545 !(data.capabilities & WPA_CAPABILITY_MFPC)) 546 sm->mgmt_frame_prot = 0; 547 else 548 sm->mgmt_frame_prot = 1; 549 #endif /* CONFIG_IEEE80211W */ 550 551 #ifdef CONFIG_IEEE80211R 552 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { 553 if (mdie == NULL || mdie_len < MOBILITY_DOMAIN_ID_LEN + 1) { 554 wpa_printf(MSG_DEBUG, "RSN: Trying to use FT, but " 555 "MDIE not included"); 556 return WPA_INVALID_MDIE; 557 } 558 if (os_memcmp(mdie, wpa_auth->conf.mobility_domain, 559 MOBILITY_DOMAIN_ID_LEN) != 0) { 560 wpa_hexdump(MSG_DEBUG, "RSN: Attempted to use unknown " 561 "MDIE", mdie, MOBILITY_DOMAIN_ID_LEN); 562 return WPA_INVALID_MDIE; 563 } 564 } 565 #endif /* CONFIG_IEEE80211R */ 566 567 sm->pairwise = wpa_pick_pairwise_cipher(ciphers, 0); 568 if (sm->pairwise < 0) 569 return WPA_INVALID_PAIRWISE; 570 571 /* TODO: clear WPA/WPA2 state if STA changes from one to another */ 572 if (wpa_ie[0] == WLAN_EID_RSN) 573 sm->wpa = WPA_VERSION_WPA2; 574 else 575 sm->wpa = WPA_VERSION_WPA; 576 577 sm->pmksa = NULL; 578 for (i = 0; i < data.num_pmkid; i++) { 579 wpa_hexdump(MSG_DEBUG, "RSN IE: STA PMKID", 580 &data.pmkid[i * PMKID_LEN], PMKID_LEN); 581 sm->pmksa = pmksa_cache_auth_get(wpa_auth->pmksa, sm->addr, 582 &data.pmkid[i * PMKID_LEN]); 583 if (sm->pmksa) { 584 pmkid = sm->pmksa->pmkid; 585 break; 586 } 587 } 588 for (i = 0; sm->pmksa == NULL && wpa_auth->conf.okc && 589 i < data.num_pmkid; i++) { 590 struct wpa_auth_okc_iter_data idata; 591 idata.pmksa = NULL; 592 idata.aa = wpa_auth->addr; 593 idata.spa = sm->addr; 594 idata.pmkid = &data.pmkid[i * PMKID_LEN]; 595 wpa_auth_for_each_auth(wpa_auth, wpa_auth_okc_iter, &idata); 596 if (idata.pmksa) { 597 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 598 "OKC match for PMKID"); 599 sm->pmksa = pmksa_cache_add_okc(wpa_auth->pmksa, 600 idata.pmksa, 601 wpa_auth->addr, 602 idata.pmkid); 603 pmkid = idata.pmkid; 604 break; 605 } 606 } 607 if (sm->pmksa) { 608 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, 609 "PMKID found from PMKSA cache " 610 "eap_type=%d vlan_id=%d", 611 sm->pmksa->eap_type_authsrv, 612 sm->pmksa->vlan_id); 613 os_memcpy(wpa_auth->dot11RSNAPMKIDUsed, pmkid, PMKID_LEN); 614 } 615 616 if (sm->wpa_ie == NULL || sm->wpa_ie_len < wpa_ie_len) { 617 os_free(sm->wpa_ie); 618 sm->wpa_ie = os_malloc(wpa_ie_len); 619 if (sm->wpa_ie == NULL) 620 return WPA_ALLOC_FAIL; 621 } 622 os_memcpy(sm->wpa_ie, wpa_ie, wpa_ie_len); 623 sm->wpa_ie_len = wpa_ie_len; 624 625 return WPA_IE_OK; 626 } 627 628 629 /** 630 * wpa_parse_generic - Parse EAPOL-Key Key Data Generic IEs 631 * @pos: Pointer to the IE header 632 * @end: Pointer to the end of the Key Data buffer 633 * @ie: Pointer to parsed IE data 634 * Returns: 0 on success, 1 if end mark is found, -1 on failure 635 */ 636 static int wpa_parse_generic(const u8 *pos, const u8 *end, 637 struct wpa_eapol_ie_parse *ie) 638 { 639 if (pos[1] == 0) 640 return 1; 641 642 if (pos[1] >= 6 && 643 RSN_SELECTOR_GET(pos + 2) == WPA_OUI_TYPE && 644 pos[2 + WPA_SELECTOR_LEN] == 1 && 645 pos[2 + WPA_SELECTOR_LEN + 1] == 0) { 646 ie->wpa_ie = pos; 647 ie->wpa_ie_len = pos[1] + 2; 648 return 0; 649 } 650 651 if (pos + 1 + RSN_SELECTOR_LEN < end && 652 pos[1] >= RSN_SELECTOR_LEN + PMKID_LEN && 653 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_PMKID) { 654 ie->pmkid = pos + 2 + RSN_SELECTOR_LEN; 655 return 0; 656 } 657 658 if (pos[1] > RSN_SELECTOR_LEN + 2 && 659 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_GROUPKEY) { 660 ie->gtk = pos + 2 + RSN_SELECTOR_LEN; 661 ie->gtk_len = pos[1] - RSN_SELECTOR_LEN; 662 return 0; 663 } 664 665 if (pos[1] > RSN_SELECTOR_LEN + 2 && 666 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_MAC_ADDR) { 667 ie->mac_addr = pos + 2 + RSN_SELECTOR_LEN; 668 ie->mac_addr_len = pos[1] - RSN_SELECTOR_LEN; 669 return 0; 670 } 671 672 #ifdef CONFIG_PEERKEY 673 if (pos[1] > RSN_SELECTOR_LEN + 2 && 674 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_SMK) { 675 ie->smk = pos + 2 + RSN_SELECTOR_LEN; 676 ie->smk_len = pos[1] - RSN_SELECTOR_LEN; 677 return 0; 678 } 679 680 if (pos[1] > RSN_SELECTOR_LEN + 2 && 681 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_NONCE) { 682 ie->nonce = pos + 2 + RSN_SELECTOR_LEN; 683 ie->nonce_len = pos[1] - RSN_SELECTOR_LEN; 684 return 0; 685 } 686 687 if (pos[1] > RSN_SELECTOR_LEN + 2 && 688 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_LIFETIME) { 689 ie->lifetime = pos + 2 + RSN_SELECTOR_LEN; 690 ie->lifetime_len = pos[1] - RSN_SELECTOR_LEN; 691 return 0; 692 } 693 694 if (pos[1] > RSN_SELECTOR_LEN + 2 && 695 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_ERROR) { 696 ie->error = pos + 2 + RSN_SELECTOR_LEN; 697 ie->error_len = pos[1] - RSN_SELECTOR_LEN; 698 return 0; 699 } 700 #endif /* CONFIG_PEERKEY */ 701 702 #ifdef CONFIG_IEEE80211W 703 if (pos[1] > RSN_SELECTOR_LEN + 2 && 704 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_IGTK) { 705 ie->igtk = pos + 2 + RSN_SELECTOR_LEN; 706 ie->igtk_len = pos[1] - RSN_SELECTOR_LEN; 707 return 0; 708 } 709 #endif /* CONFIG_IEEE80211W */ 710 711 return 0; 712 } 713 714 715 /** 716 * wpa_parse_kde_ies - Parse EAPOL-Key Key Data IEs 717 * @buf: Pointer to the Key Data buffer 718 * @len: Key Data Length 719 * @ie: Pointer to parsed IE data 720 * Returns: 0 on success, -1 on failure 721 */ 722 int wpa_parse_kde_ies(const u8 *buf, size_t len, struct wpa_eapol_ie_parse *ie) 723 { 724 const u8 *pos, *end; 725 int ret = 0; 726 727 os_memset(ie, 0, sizeof(*ie)); 728 for (pos = buf, end = pos + len; pos + 1 < end; pos += 2 + pos[1]) { 729 if (pos[0] == 0xdd && 730 ((pos == buf + len - 1) || pos[1] == 0)) { 731 /* Ignore padding */ 732 break; 733 } 734 if (pos + 2 + pos[1] > end) { 735 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key Key Data " 736 "underflow (ie=%d len=%d pos=%d)", 737 pos[0], pos[1], (int) (pos - buf)); 738 wpa_hexdump_key(MSG_DEBUG, "WPA: Key Data", 739 buf, len); 740 ret = -1; 741 break; 742 } 743 if (*pos == WLAN_EID_RSN) { 744 ie->rsn_ie = pos; 745 ie->rsn_ie_len = pos[1] + 2; 746 #ifdef CONFIG_IEEE80211R 747 } else if (*pos == WLAN_EID_MOBILITY_DOMAIN) { 748 ie->mdie = pos; 749 ie->mdie_len = pos[1] + 2; 750 } else if (*pos == WLAN_EID_FAST_BSS_TRANSITION) { 751 ie->ftie = pos; 752 ie->ftie_len = pos[1] + 2; 753 #endif /* CONFIG_IEEE80211R */ 754 } else if (*pos == WLAN_EID_VENDOR_SPECIFIC) { 755 ret = wpa_parse_generic(pos, end, ie); 756 if (ret < 0) 757 break; 758 if (ret > 0) { 759 ret = 0; 760 break; 761 } 762 } else { 763 wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized EAPOL-Key " 764 "Key Data IE", pos, 2 + pos[1]); 765 } 766 } 767 768 return ret; 769 } 770 771 772 int wpa_auth_uses_mfp(struct wpa_state_machine *sm) 773 { 774 return sm ? sm->mgmt_frame_prot : 0; 775 } 776
