1 /* 2 * wpa_supplicant - WPA/RSN IE and KDE processing 3 * Copyright (c) 2003-2015, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "includes.h" 10 11 #include "common.h" 12 #include "wpa.h" 13 #include "pmksa_cache.h" 14 #include "common/ieee802_11_defs.h" 15 #include "wpa_i.h" 16 #include "wpa_ie.h" 17 18 19 /** 20 * wpa_parse_wpa_ie - Parse WPA/RSN IE 21 * @wpa_ie: Pointer to WPA or RSN IE 22 * @wpa_ie_len: Length of the WPA/RSN IE 23 * @data: Pointer to data area for parsing results 24 * Returns: 0 on success, -1 on failure 25 * 26 * Parse the contents of WPA or RSN IE and write the parsed data into data. 27 */ 28 int wpa_parse_wpa_ie(const u8 *wpa_ie, size_t wpa_ie_len, 29 struct wpa_ie_data *data) 30 { 31 if (wpa_ie_len >= 1 && wpa_ie[0] == WLAN_EID_RSN) 32 return wpa_parse_wpa_ie_rsn(wpa_ie, wpa_ie_len, data); 33 if (wpa_ie_len >= 6 && wpa_ie[0] == WLAN_EID_VENDOR_SPECIFIC && 34 wpa_ie[1] >= 4 && WPA_GET_BE32(&wpa_ie[2]) == OSEN_IE_VENDOR_TYPE) 35 return wpa_parse_wpa_ie_rsn(wpa_ie, wpa_ie_len, data); 36 else 37 return wpa_parse_wpa_ie_wpa(wpa_ie, wpa_ie_len, data); 38 } 39 40 41 static int wpa_gen_wpa_ie_wpa(u8 *wpa_ie, size_t wpa_ie_len, 42 int pairwise_cipher, int group_cipher, 43 int key_mgmt) 44 { 45 u8 *pos; 46 struct wpa_ie_hdr *hdr; 47 u32 suite; 48 49 if (wpa_ie_len < sizeof(*hdr) + WPA_SELECTOR_LEN + 50 2 + WPA_SELECTOR_LEN + 2 + WPA_SELECTOR_LEN) 51 return -1; 52 53 hdr = (struct wpa_ie_hdr *) wpa_ie; 54 hdr->elem_id = WLAN_EID_VENDOR_SPECIFIC; 55 RSN_SELECTOR_PUT(hdr->oui, WPA_OUI_TYPE); 56 WPA_PUT_LE16(hdr->version, WPA_VERSION); 57 pos = (u8 *) (hdr + 1); 58 59 suite = wpa_cipher_to_suite(WPA_PROTO_WPA, group_cipher); 60 if (suite == 0) { 61 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).", 62 group_cipher); 63 return -1; 64 } 65 RSN_SELECTOR_PUT(pos, suite); 66 pos += WPA_SELECTOR_LEN; 67 68 *pos++ = 1; 69 *pos++ = 0; 70 suite = wpa_cipher_to_suite(WPA_PROTO_WPA, pairwise_cipher); 71 if (suite == 0 || 72 (!wpa_cipher_valid_pairwise(pairwise_cipher) && 73 pairwise_cipher != WPA_CIPHER_NONE)) { 74 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).", 75 pairwise_cipher); 76 return -1; 77 } 78 RSN_SELECTOR_PUT(pos, suite); 79 pos += WPA_SELECTOR_LEN; 80 81 *pos++ = 1; 82 *pos++ = 0; 83 if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) { 84 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_UNSPEC_802_1X); 85 } else if (key_mgmt == WPA_KEY_MGMT_PSK) { 86 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X); 87 } else if (key_mgmt == WPA_KEY_MGMT_WPA_NONE) { 88 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_NONE); 89 } else if (key_mgmt == WPA_KEY_MGMT_CCKM) { 90 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_CCKM); 91 } else { 92 wpa_printf(MSG_WARNING, "Invalid key management type (%d).", 93 key_mgmt); 94 return -1; 95 } 96 pos += WPA_SELECTOR_LEN; 97 98 /* WPA Capabilities; use defaults, so no need to include it */ 99 100 hdr->len = (pos - wpa_ie) - 2; 101 102 WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len); 103 104 return pos - wpa_ie; 105 } 106 107 108 static int wpa_gen_wpa_ie_rsn(u8 *rsn_ie, size_t rsn_ie_len, 109 int pairwise_cipher, int group_cipher, 110 int key_mgmt, int mgmt_group_cipher, 111 struct wpa_sm *sm) 112 { 113 u8 *pos; 114 struct rsn_ie_hdr *hdr; 115 u16 capab; 116 u32 suite; 117 118 if (rsn_ie_len < sizeof(*hdr) + RSN_SELECTOR_LEN + 119 2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN + 2 + 120 (sm->cur_pmksa ? 2 + PMKID_LEN : 0)) { 121 wpa_printf(MSG_DEBUG, "RSN: Too short IE buffer (%lu bytes)", 122 (unsigned long) rsn_ie_len); 123 return -1; 124 } 125 126 hdr = (struct rsn_ie_hdr *) rsn_ie; 127 hdr->elem_id = WLAN_EID_RSN; 128 WPA_PUT_LE16(hdr->version, RSN_VERSION); 129 pos = (u8 *) (hdr + 1); 130 131 suite = wpa_cipher_to_suite(WPA_PROTO_RSN, group_cipher); 132 if (suite == 0) { 133 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).", 134 group_cipher); 135 return -1; 136 } 137 RSN_SELECTOR_PUT(pos, suite); 138 pos += RSN_SELECTOR_LEN; 139 140 *pos++ = 1; 141 *pos++ = 0; 142 suite = wpa_cipher_to_suite(WPA_PROTO_RSN, pairwise_cipher); 143 if (suite == 0 || 144 (!wpa_cipher_valid_pairwise(pairwise_cipher) && 145 pairwise_cipher != WPA_CIPHER_NONE)) { 146 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).", 147 pairwise_cipher); 148 return -1; 149 } 150 RSN_SELECTOR_PUT(pos, suite); 151 pos += RSN_SELECTOR_LEN; 152 153 *pos++ = 1; 154 *pos++ = 0; 155 if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) { 156 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_UNSPEC_802_1X); 157 } else if (key_mgmt == WPA_KEY_MGMT_PSK) { 158 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X); 159 } else if (key_mgmt == WPA_KEY_MGMT_CCKM) { 160 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_CCKM); 161 #ifdef CONFIG_IEEE80211R 162 } else if (key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) { 163 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X); 164 } else if (key_mgmt == WPA_KEY_MGMT_FT_PSK) { 165 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK); 166 #endif /* CONFIG_IEEE80211R */ 167 #ifdef CONFIG_IEEE80211W 168 } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SHA256) { 169 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SHA256); 170 } else if (key_mgmt == WPA_KEY_MGMT_PSK_SHA256) { 171 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_SHA256); 172 #endif /* CONFIG_IEEE80211W */ 173 #ifdef CONFIG_SAE 174 } else if (key_mgmt == WPA_KEY_MGMT_SAE) { 175 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_SAE); 176 } else if (key_mgmt == WPA_KEY_MGMT_FT_SAE) { 177 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE); 178 #endif /* CONFIG_SAE */ 179 } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SUITE_B_192) { 180 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SUITE_B_192); 181 } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SUITE_B) { 182 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SUITE_B); 183 #ifdef CONFIG_FILS 184 } else if (key_mgmt & WPA_KEY_MGMT_FILS_SHA256) { 185 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FILS_SHA256); 186 } else if (key_mgmt & WPA_KEY_MGMT_FILS_SHA384) { 187 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FILS_SHA384); 188 #ifdef CONFIG_IEEE80211R 189 } else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA256) { 190 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA256); 191 } else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA384) { 192 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA384); 193 #endif /* CONFIG_IEEE80211R */ 194 #endif /* CONFIG_FILS */ 195 } else { 196 wpa_printf(MSG_WARNING, "Invalid key management type (%d).", 197 key_mgmt); 198 return -1; 199 } 200 pos += RSN_SELECTOR_LEN; 201 202 /* RSN Capabilities */ 203 capab = 0; 204 #ifdef CONFIG_IEEE80211W 205 if (sm->mfp) 206 capab |= WPA_CAPABILITY_MFPC; 207 if (sm->mfp == 2) 208 capab |= WPA_CAPABILITY_MFPR; 209 #endif /* CONFIG_IEEE80211W */ 210 WPA_PUT_LE16(pos, capab); 211 pos += 2; 212 213 if (sm->cur_pmksa) { 214 /* PMKID Count (2 octets, little endian) */ 215 *pos++ = 1; 216 *pos++ = 0; 217 /* PMKID */ 218 os_memcpy(pos, sm->cur_pmksa->pmkid, PMKID_LEN); 219 pos += PMKID_LEN; 220 } 221 222 #ifdef CONFIG_IEEE80211W 223 if (wpa_cipher_valid_mgmt_group(mgmt_group_cipher)) { 224 if (!sm->cur_pmksa) { 225 /* PMKID Count */ 226 WPA_PUT_LE16(pos, 0); 227 pos += 2; 228 } 229 230 /* Management Group Cipher Suite */ 231 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN, 232 mgmt_group_cipher)); 233 pos += RSN_SELECTOR_LEN; 234 } 235 #endif /* CONFIG_IEEE80211W */ 236 237 hdr->len = (pos - rsn_ie) - 2; 238 239 WPA_ASSERT((size_t) (pos - rsn_ie) <= rsn_ie_len); 240 241 return pos - rsn_ie; 242 } 243 244 245 #ifdef CONFIG_HS20 246 static int wpa_gen_wpa_ie_osen(u8 *wpa_ie, size_t wpa_ie_len, 247 int pairwise_cipher, int group_cipher, 248 int key_mgmt) 249 { 250 u8 *pos, *len; 251 u32 suite; 252 253 if (wpa_ie_len < 2 + 4 + RSN_SELECTOR_LEN + 254 2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN) 255 return -1; 256 257 pos = wpa_ie; 258 *pos++ = WLAN_EID_VENDOR_SPECIFIC; 259 len = pos++; /* to be filled */ 260 WPA_PUT_BE24(pos, OUI_WFA); 261 pos += 3; 262 *pos++ = HS20_OSEN_OUI_TYPE; 263 264 /* Group Data Cipher Suite */ 265 suite = wpa_cipher_to_suite(WPA_PROTO_RSN, group_cipher); 266 if (suite == 0) { 267 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).", 268 group_cipher); 269 return -1; 270 } 271 RSN_SELECTOR_PUT(pos, suite); 272 pos += RSN_SELECTOR_LEN; 273 274 /* Pairwise Cipher Suite Count and List */ 275 WPA_PUT_LE16(pos, 1); 276 pos += 2; 277 suite = wpa_cipher_to_suite(WPA_PROTO_RSN, pairwise_cipher); 278 if (suite == 0 || 279 (!wpa_cipher_valid_pairwise(pairwise_cipher) && 280 pairwise_cipher != WPA_CIPHER_NONE)) { 281 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).", 282 pairwise_cipher); 283 return -1; 284 } 285 RSN_SELECTOR_PUT(pos, suite); 286 pos += RSN_SELECTOR_LEN; 287 288 /* AKM Suite Count and List */ 289 WPA_PUT_LE16(pos, 1); 290 pos += 2; 291 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_OSEN); 292 pos += RSN_SELECTOR_LEN; 293 294 *len = pos - len - 1; 295 296 WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len); 297 298 return pos - wpa_ie; 299 } 300 #endif /* CONFIG_HS20 */ 301 302 303 /** 304 * wpa_gen_wpa_ie - Generate WPA/RSN IE based on current security policy 305 * @sm: Pointer to WPA state machine data from wpa_sm_init() 306 * @wpa_ie: Pointer to memory area for the generated WPA/RSN IE 307 * @wpa_ie_len: Maximum length of the generated WPA/RSN IE 308 * Returns: Length of the generated WPA/RSN IE or -1 on failure 309 */ 310 int wpa_gen_wpa_ie(struct wpa_sm *sm, u8 *wpa_ie, size_t wpa_ie_len) 311 { 312 if (sm->proto == WPA_PROTO_RSN) 313 return wpa_gen_wpa_ie_rsn(wpa_ie, wpa_ie_len, 314 sm->pairwise_cipher, 315 sm->group_cipher, 316 sm->key_mgmt, sm->mgmt_group_cipher, 317 sm); 318 #ifdef CONFIG_HS20 319 else if (sm->proto == WPA_PROTO_OSEN) 320 return wpa_gen_wpa_ie_osen(wpa_ie, wpa_ie_len, 321 sm->pairwise_cipher, 322 sm->group_cipher, 323 sm->key_mgmt); 324 #endif /* CONFIG_HS20 */ 325 else 326 return wpa_gen_wpa_ie_wpa(wpa_ie, wpa_ie_len, 327 sm->pairwise_cipher, 328 sm->group_cipher, 329 sm->key_mgmt); 330 } 331 332 333 /** 334 * wpa_parse_vendor_specific - Parse Vendor Specific IEs 335 * @pos: Pointer to the IE header 336 * @end: Pointer to the end of the Key Data buffer 337 * @ie: Pointer to parsed IE data 338 * Returns: 0 on success, 1 if end mark is found, -1 on failure 339 */ 340 static int wpa_parse_vendor_specific(const u8 *pos, const u8 *end, 341 struct wpa_eapol_ie_parse *ie) 342 { 343 unsigned int oui; 344 345 if (pos[1] < 4) { 346 wpa_printf(MSG_MSGDUMP, "Too short vendor specific IE ignored (len=%u)", 347 pos[1]); 348 return 1; 349 } 350 351 oui = WPA_GET_BE24(&pos[2]); 352 if (oui == OUI_MICROSOFT && pos[5] == WMM_OUI_TYPE && pos[1] > 4) { 353 if (pos[6] == WMM_OUI_SUBTYPE_INFORMATION_ELEMENT) { 354 ie->wmm = &pos[2]; 355 ie->wmm_len = pos[1]; 356 wpa_hexdump(MSG_DEBUG, "WPA: WMM IE", 357 ie->wmm, ie->wmm_len); 358 } else if (pos[6] == WMM_OUI_SUBTYPE_PARAMETER_ELEMENT) { 359 ie->wmm = &pos[2]; 360 ie->wmm_len = pos[1]; 361 wpa_hexdump(MSG_DEBUG, "WPA: WMM Parameter Element", 362 ie->wmm, ie->wmm_len); 363 } 364 } 365 return 0; 366 } 367 368 369 /** 370 * wpa_parse_generic - Parse EAPOL-Key Key Data Generic IEs 371 * @pos: Pointer to the IE header 372 * @end: Pointer to the end of the Key Data buffer 373 * @ie: Pointer to parsed IE data 374 * Returns: 0 on success, 1 if end mark is found, -1 on failure 375 */ 376 static int wpa_parse_generic(const u8 *pos, const u8 *end, 377 struct wpa_eapol_ie_parse *ie) 378 { 379 if (pos[1] == 0) 380 return 1; 381 382 if (pos[1] >= 6 && 383 RSN_SELECTOR_GET(pos + 2) == WPA_OUI_TYPE && 384 pos[2 + WPA_SELECTOR_LEN] == 1 && 385 pos[2 + WPA_SELECTOR_LEN + 1] == 0) { 386 ie->wpa_ie = pos; 387 ie->wpa_ie_len = pos[1] + 2; 388 wpa_hexdump(MSG_DEBUG, "WPA: WPA IE in EAPOL-Key", 389 ie->wpa_ie, ie->wpa_ie_len); 390 return 0; 391 } 392 393 if (1 + RSN_SELECTOR_LEN < end - pos && 394 pos[1] >= RSN_SELECTOR_LEN + PMKID_LEN && 395 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_PMKID) { 396 ie->pmkid = pos + 2 + RSN_SELECTOR_LEN; 397 wpa_hexdump(MSG_DEBUG, "WPA: PMKID in EAPOL-Key", 398 pos, pos[1] + 2); 399 return 0; 400 } 401 402 if (pos[1] > RSN_SELECTOR_LEN + 2 && 403 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_GROUPKEY) { 404 ie->gtk = pos + 2 + RSN_SELECTOR_LEN; 405 ie->gtk_len = pos[1] - RSN_SELECTOR_LEN; 406 wpa_hexdump_key(MSG_DEBUG, "WPA: GTK in EAPOL-Key", 407 pos, pos[1] + 2); 408 return 0; 409 } 410 411 if (pos[1] > RSN_SELECTOR_LEN + 2 && 412 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_MAC_ADDR) { 413 ie->mac_addr = pos + 2 + RSN_SELECTOR_LEN; 414 ie->mac_addr_len = pos[1] - RSN_SELECTOR_LEN; 415 wpa_hexdump(MSG_DEBUG, "WPA: MAC Address in EAPOL-Key", 416 pos, pos[1] + 2); 417 return 0; 418 } 419 420 #ifdef CONFIG_PEERKEY 421 if (pos[1] > RSN_SELECTOR_LEN + 2 && 422 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_SMK) { 423 ie->smk = pos + 2 + RSN_SELECTOR_LEN; 424 ie->smk_len = pos[1] - RSN_SELECTOR_LEN; 425 wpa_hexdump_key(MSG_DEBUG, "WPA: SMK in EAPOL-Key", 426 pos, pos[1] + 2); 427 return 0; 428 } 429 430 if (pos[1] > RSN_SELECTOR_LEN + 2 && 431 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_NONCE) { 432 ie->nonce = pos + 2 + RSN_SELECTOR_LEN; 433 ie->nonce_len = pos[1] - RSN_SELECTOR_LEN; 434 wpa_hexdump(MSG_DEBUG, "WPA: Nonce in EAPOL-Key", 435 pos, pos[1] + 2); 436 return 0; 437 } 438 439 if (pos[1] > RSN_SELECTOR_LEN + 2 && 440 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_LIFETIME) { 441 ie->lifetime = pos + 2 + RSN_SELECTOR_LEN; 442 ie->lifetime_len = pos[1] - RSN_SELECTOR_LEN; 443 wpa_hexdump(MSG_DEBUG, "WPA: Lifetime in EAPOL-Key", 444 pos, pos[1] + 2); 445 return 0; 446 } 447 448 if (pos[1] > RSN_SELECTOR_LEN + 2 && 449 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_ERROR) { 450 ie->error = pos + 2 + RSN_SELECTOR_LEN; 451 ie->error_len = pos[1] - RSN_SELECTOR_LEN; 452 wpa_hexdump(MSG_DEBUG, "WPA: Error in EAPOL-Key", 453 pos, pos[1] + 2); 454 return 0; 455 } 456 #endif /* CONFIG_PEERKEY */ 457 458 #ifdef CONFIG_IEEE80211W 459 if (pos[1] > RSN_SELECTOR_LEN + 2 && 460 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_IGTK) { 461 ie->igtk = pos + 2 + RSN_SELECTOR_LEN; 462 ie->igtk_len = pos[1] - RSN_SELECTOR_LEN; 463 wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK in EAPOL-Key", 464 pos, pos[1] + 2); 465 return 0; 466 } 467 #endif /* CONFIG_IEEE80211W */ 468 469 #ifdef CONFIG_P2P 470 if (pos[1] >= RSN_SELECTOR_LEN + 1 && 471 RSN_SELECTOR_GET(pos + 2) == WFA_KEY_DATA_IP_ADDR_REQ) { 472 ie->ip_addr_req = pos + 2 + RSN_SELECTOR_LEN; 473 wpa_hexdump(MSG_DEBUG, "WPA: IP Address Request in EAPOL-Key", 474 ie->ip_addr_req, pos[1] - RSN_SELECTOR_LEN); 475 return 0; 476 } 477 478 if (pos[1] >= RSN_SELECTOR_LEN + 3 * 4 && 479 RSN_SELECTOR_GET(pos + 2) == WFA_KEY_DATA_IP_ADDR_ALLOC) { 480 ie->ip_addr_alloc = pos + 2 + RSN_SELECTOR_LEN; 481 wpa_hexdump(MSG_DEBUG, 482 "WPA: IP Address Allocation in EAPOL-Key", 483 ie->ip_addr_alloc, pos[1] - RSN_SELECTOR_LEN); 484 return 0; 485 } 486 #endif /* CONFIG_P2P */ 487 488 return 0; 489 } 490 491 492 /** 493 * wpa_supplicant_parse_ies - Parse EAPOL-Key Key Data IEs 494 * @buf: Pointer to the Key Data buffer 495 * @len: Key Data Length 496 * @ie: Pointer to parsed IE data 497 * Returns: 0 on success, -1 on failure 498 */ 499 int wpa_supplicant_parse_ies(const u8 *buf, size_t len, 500 struct wpa_eapol_ie_parse *ie) 501 { 502 const u8 *pos, *end; 503 int ret = 0; 504 505 os_memset(ie, 0, sizeof(*ie)); 506 for (pos = buf, end = pos + len; end - pos > 1; pos += 2 + pos[1]) { 507 if (pos[0] == 0xdd && 508 ((pos == buf + len - 1) || pos[1] == 0)) { 509 /* Ignore padding */ 510 break; 511 } 512 if (2 + pos[1] > end - pos) { 513 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key Key Data " 514 "underflow (ie=%d len=%d pos=%d)", 515 pos[0], pos[1], (int) (pos - buf)); 516 wpa_hexdump_key(MSG_DEBUG, "WPA: Key Data", 517 buf, len); 518 ret = -1; 519 break; 520 } 521 if (*pos == WLAN_EID_RSN) { 522 ie->rsn_ie = pos; 523 ie->rsn_ie_len = pos[1] + 2; 524 wpa_hexdump(MSG_DEBUG, "WPA: RSN IE in EAPOL-Key", 525 ie->rsn_ie, ie->rsn_ie_len); 526 } else if (*pos == WLAN_EID_MOBILITY_DOMAIN && 527 pos[1] >= sizeof(struct rsn_mdie)) { 528 ie->mdie = pos; 529 ie->mdie_len = pos[1] + 2; 530 wpa_hexdump(MSG_DEBUG, "WPA: MDIE in EAPOL-Key", 531 ie->mdie, ie->mdie_len); 532 } else if (*pos == WLAN_EID_FAST_BSS_TRANSITION && 533 pos[1] >= sizeof(struct rsn_ftie)) { 534 ie->ftie = pos; 535 ie->ftie_len = pos[1] + 2; 536 wpa_hexdump(MSG_DEBUG, "WPA: FTIE in EAPOL-Key", 537 ie->ftie, ie->ftie_len); 538 } else if (*pos == WLAN_EID_TIMEOUT_INTERVAL && pos[1] >= 5) { 539 if (pos[2] == WLAN_TIMEOUT_REASSOC_DEADLINE) { 540 ie->reassoc_deadline = pos; 541 wpa_hexdump(MSG_DEBUG, "WPA: Reassoc Deadline " 542 "in EAPOL-Key", 543 ie->reassoc_deadline, pos[1] + 2); 544 } else if (pos[2] == WLAN_TIMEOUT_KEY_LIFETIME) { 545 ie->key_lifetime = pos; 546 wpa_hexdump(MSG_DEBUG, "WPA: KeyLifetime " 547 "in EAPOL-Key", 548 ie->key_lifetime, pos[1] + 2); 549 } else { 550 wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized " 551 "EAPOL-Key Key Data IE", 552 pos, 2 + pos[1]); 553 } 554 } else if (*pos == WLAN_EID_LINK_ID) { 555 if (pos[1] >= 18) { 556 ie->lnkid = pos; 557 ie->lnkid_len = pos[1] + 2; 558 } 559 } else if (*pos == WLAN_EID_EXT_CAPAB) { 560 ie->ext_capab = pos; 561 ie->ext_capab_len = pos[1] + 2; 562 } else if (*pos == WLAN_EID_SUPP_RATES) { 563 ie->supp_rates = pos; 564 ie->supp_rates_len = pos[1] + 2; 565 } else if (*pos == WLAN_EID_EXT_SUPP_RATES) { 566 ie->ext_supp_rates = pos; 567 ie->ext_supp_rates_len = pos[1] + 2; 568 } else if (*pos == WLAN_EID_HT_CAP && 569 pos[1] >= sizeof(struct ieee80211_ht_capabilities)) { 570 ie->ht_capabilities = pos + 2; 571 } else if (*pos == WLAN_EID_VHT_AID) { 572 if (pos[1] >= 2) 573 ie->aid = WPA_GET_LE16(pos + 2) & 0x3fff; 574 } else if (*pos == WLAN_EID_VHT_CAP && 575 pos[1] >= sizeof(struct ieee80211_vht_capabilities)) 576 { 577 ie->vht_capabilities = pos + 2; 578 } else if (*pos == WLAN_EID_QOS && pos[1] >= 1) { 579 ie->qosinfo = pos[2]; 580 } else if (*pos == WLAN_EID_SUPPORTED_CHANNELS) { 581 ie->supp_channels = pos + 2; 582 ie->supp_channels_len = pos[1]; 583 } else if (*pos == WLAN_EID_SUPPORTED_OPERATING_CLASSES) { 584 /* 585 * The value of the Length field of the Supported 586 * Operating Classes element is between 2 and 253. 587 * Silently skip invalid elements to avoid interop 588 * issues when trying to use the value. 589 */ 590 if (pos[1] >= 2 && pos[1] <= 253) { 591 ie->supp_oper_classes = pos + 2; 592 ie->supp_oper_classes_len = pos[1]; 593 } 594 } else if (*pos == WLAN_EID_VENDOR_SPECIFIC) { 595 ret = wpa_parse_generic(pos, end, ie); 596 if (ret < 0) 597 break; 598 if (ret > 0) { 599 ret = 0; 600 break; 601 } 602 603 ret = wpa_parse_vendor_specific(pos, end, ie); 604 if (ret < 0) 605 break; 606 if (ret > 0) { 607 ret = 0; 608 break; 609 } 610 } else { 611 wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized EAPOL-Key " 612 "Key Data IE", pos, 2 + pos[1]); 613 } 614 } 615 616 return ret; 617 } 618
