1 /* 2 * WPA/RSN - Shared functions for supplicant and authenticator 3 * Copyright (c) 2002-2013, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "includes.h" 10 11 #include "common.h" 12 #include "crypto/md5.h" 13 #include "crypto/sha1.h" 14 #include "crypto/sha256.h" 15 #include "crypto/aes_wrap.h" 16 #include "crypto/crypto.h" 17 #include "ieee802_11_defs.h" 18 #include "defs.h" 19 #include "wpa_common.h" 20 21 22 /** 23 * wpa_eapol_key_mic - Calculate EAPOL-Key MIC 24 * @key: EAPOL-Key Key Confirmation Key (KCK) 25 * @ver: Key descriptor version (WPA_KEY_INFO_TYPE_*) 26 * @buf: Pointer to the beginning of the EAPOL header (version field) 27 * @len: Length of the EAPOL frame (from EAPOL header to the end of the frame) 28 * @mic: Pointer to the buffer to which the EAPOL-Key MIC is written 29 * Returns: 0 on success, -1 on failure 30 * 31 * Calculate EAPOL-Key MIC for an EAPOL-Key packet. The EAPOL-Key MIC field has 32 * to be cleared (all zeroes) when calling this function. 33 * 34 * Note: 'IEEE Std 802.11i-2004 - 8.5.2 EAPOL-Key frames' has an error in the 35 * description of the Key MIC calculation. It includes packet data from the 36 * beginning of the EAPOL-Key header, not EAPOL header. This incorrect change 37 * happened during final editing of the standard and the correct behavior is 38 * defined in the last draft (IEEE 802.11i/D10). 39 */ 40 int wpa_eapol_key_mic(const u8 *key, int ver, const u8 *buf, size_t len, 41 u8 *mic) 42 { 43 u8 hash[SHA1_MAC_LEN]; 44 45 switch (ver) { 46 #ifndef CONFIG_FIPS 47 case WPA_KEY_INFO_TYPE_HMAC_MD5_RC4: 48 return hmac_md5(key, 16, buf, len, mic); 49 #endif /* CONFIG_FIPS */ 50 case WPA_KEY_INFO_TYPE_HMAC_SHA1_AES: 51 if (hmac_sha1(key, 16, buf, len, hash)) 52 return -1; 53 os_memcpy(mic, hash, MD5_MAC_LEN); 54 break; 55 #if defined(CONFIG_IEEE80211R) || defined(CONFIG_IEEE80211W) 56 case WPA_KEY_INFO_TYPE_AES_128_CMAC: 57 return omac1_aes_128(key, buf, len, mic); 58 #endif /* CONFIG_IEEE80211R || CONFIG_IEEE80211W */ 59 default: 60 return -1; 61 } 62 63 return 0; 64 } 65 66 67 /** 68 * wpa_pmk_to_ptk - Calculate PTK from PMK, addresses, and nonces 69 * @pmk: Pairwise master key 70 * @pmk_len: Length of PMK 71 * @label: Label to use in derivation 72 * @addr1: AA or SA 73 * @addr2: SA or AA 74 * @nonce1: ANonce or SNonce 75 * @nonce2: SNonce or ANonce 76 * @ptk: Buffer for pairwise transient key 77 * @ptk_len: Length of PTK 78 * @use_sha256: Whether to use SHA256-based KDF 79 * 80 * IEEE Std 802.11i-2004 - 8.5.1.2 Pairwise key hierarchy 81 * PTK = PRF-X(PMK, "Pairwise key expansion", 82 * Min(AA, SA) || Max(AA, SA) || 83 * Min(ANonce, SNonce) || Max(ANonce, SNonce)) 84 * 85 * STK = PRF-X(SMK, "Peer key expansion", 86 * Min(MAC_I, MAC_P) || Max(MAC_I, MAC_P) || 87 * Min(INonce, PNonce) || Max(INonce, PNonce)) 88 */ 89 void wpa_pmk_to_ptk(const u8 *pmk, size_t pmk_len, const char *label, 90 const u8 *addr1, const u8 *addr2, 91 const u8 *nonce1, const u8 *nonce2, 92 u8 *ptk, size_t ptk_len, int use_sha256) 93 { 94 u8 data[2 * ETH_ALEN + 2 * WPA_NONCE_LEN]; 95 96 if (os_memcmp(addr1, addr2, ETH_ALEN) < 0) { 97 os_memcpy(data, addr1, ETH_ALEN); 98 os_memcpy(data + ETH_ALEN, addr2, ETH_ALEN); 99 } else { 100 os_memcpy(data, addr2, ETH_ALEN); 101 os_memcpy(data + ETH_ALEN, addr1, ETH_ALEN); 102 } 103 104 if (os_memcmp(nonce1, nonce2, WPA_NONCE_LEN) < 0) { 105 os_memcpy(data + 2 * ETH_ALEN, nonce1, WPA_NONCE_LEN); 106 os_memcpy(data + 2 * ETH_ALEN + WPA_NONCE_LEN, nonce2, 107 WPA_NONCE_LEN); 108 } else { 109 os_memcpy(data + 2 * ETH_ALEN, nonce2, WPA_NONCE_LEN); 110 os_memcpy(data + 2 * ETH_ALEN + WPA_NONCE_LEN, nonce1, 111 WPA_NONCE_LEN); 112 } 113 114 #ifdef CONFIG_IEEE80211W 115 if (use_sha256) 116 sha256_prf(pmk, pmk_len, label, data, sizeof(data), 117 ptk, ptk_len); 118 else 119 #endif /* CONFIG_IEEE80211W */ 120 sha1_prf(pmk, pmk_len, label, data, sizeof(data), ptk, 121 ptk_len); 122 123 wpa_printf(MSG_DEBUG, "WPA: PTK derivation - A1=" MACSTR " A2=" MACSTR, 124 MAC2STR(addr1), MAC2STR(addr2)); 125 wpa_hexdump(MSG_DEBUG, "WPA: Nonce1", nonce1, WPA_NONCE_LEN); 126 wpa_hexdump(MSG_DEBUG, "WPA: Nonce2", nonce2, WPA_NONCE_LEN); 127 wpa_hexdump_key(MSG_DEBUG, "WPA: PMK", pmk, pmk_len); 128 wpa_hexdump_key(MSG_DEBUG, "WPA: PTK", ptk, ptk_len); 129 } 130 131 132 #ifdef CONFIG_IEEE80211R 133 int wpa_ft_mic(const u8 *kck, const u8 *sta_addr, const u8 *ap_addr, 134 u8 transaction_seqnum, const u8 *mdie, size_t mdie_len, 135 const u8 *ftie, size_t ftie_len, 136 const u8 *rsnie, size_t rsnie_len, 137 const u8 *ric, size_t ric_len, u8 *mic) 138 { 139 u8 *buf, *pos; 140 size_t buf_len; 141 142 buf_len = 2 * ETH_ALEN + 1 + mdie_len + ftie_len + rsnie_len + ric_len; 143 buf = os_malloc(buf_len); 144 if (buf == NULL) 145 return -1; 146 147 pos = buf; 148 os_memcpy(pos, sta_addr, ETH_ALEN); 149 pos += ETH_ALEN; 150 os_memcpy(pos, ap_addr, ETH_ALEN); 151 pos += ETH_ALEN; 152 *pos++ = transaction_seqnum; 153 if (rsnie) { 154 os_memcpy(pos, rsnie, rsnie_len); 155 pos += rsnie_len; 156 } 157 if (mdie) { 158 os_memcpy(pos, mdie, mdie_len); 159 pos += mdie_len; 160 } 161 if (ftie) { 162 struct rsn_ftie *_ftie; 163 os_memcpy(pos, ftie, ftie_len); 164 if (ftie_len < 2 + sizeof(*_ftie)) { 165 os_free(buf); 166 return -1; 167 } 168 _ftie = (struct rsn_ftie *) (pos + 2); 169 os_memset(_ftie->mic, 0, sizeof(_ftie->mic)); 170 pos += ftie_len; 171 } 172 if (ric) { 173 os_memcpy(pos, ric, ric_len); 174 pos += ric_len; 175 } 176 177 wpa_hexdump(MSG_MSGDUMP, "FT: MIC data", buf, pos - buf); 178 if (omac1_aes_128(kck, buf, pos - buf, mic)) { 179 os_free(buf); 180 return -1; 181 } 182 183 os_free(buf); 184 185 return 0; 186 } 187 188 189 static int wpa_ft_parse_ftie(const u8 *ie, size_t ie_len, 190 struct wpa_ft_ies *parse) 191 { 192 const u8 *end, *pos; 193 194 parse->ftie = ie; 195 parse->ftie_len = ie_len; 196 197 pos = ie + sizeof(struct rsn_ftie); 198 end = ie + ie_len; 199 200 while (pos + 2 <= end && pos + 2 + pos[1] <= end) { 201 switch (pos[0]) { 202 case FTIE_SUBELEM_R1KH_ID: 203 if (pos[1] != FT_R1KH_ID_LEN) { 204 wpa_printf(MSG_DEBUG, "FT: Invalid R1KH-ID " 205 "length in FTIE: %d", pos[1]); 206 return -1; 207 } 208 parse->r1kh_id = pos + 2; 209 break; 210 case FTIE_SUBELEM_GTK: 211 parse->gtk = pos + 2; 212 parse->gtk_len = pos[1]; 213 break; 214 case FTIE_SUBELEM_R0KH_ID: 215 if (pos[1] < 1 || pos[1] > FT_R0KH_ID_MAX_LEN) { 216 wpa_printf(MSG_DEBUG, "FT: Invalid R0KH-ID " 217 "length in FTIE: %d", pos[1]); 218 return -1; 219 } 220 parse->r0kh_id = pos + 2; 221 parse->r0kh_id_len = pos[1]; 222 break; 223 #ifdef CONFIG_IEEE80211W 224 case FTIE_SUBELEM_IGTK: 225 parse->igtk = pos + 2; 226 parse->igtk_len = pos[1]; 227 break; 228 #endif /* CONFIG_IEEE80211W */ 229 } 230 231 pos += 2 + pos[1]; 232 } 233 234 return 0; 235 } 236 237 238 int wpa_ft_parse_ies(const u8 *ies, size_t ies_len, 239 struct wpa_ft_ies *parse) 240 { 241 const u8 *end, *pos; 242 struct wpa_ie_data data; 243 int ret; 244 const struct rsn_ftie *ftie; 245 int prot_ie_count = 0; 246 247 os_memset(parse, 0, sizeof(*parse)); 248 if (ies == NULL) 249 return 0; 250 251 pos = ies; 252 end = ies + ies_len; 253 while (pos + 2 <= end && pos + 2 + pos[1] <= end) { 254 switch (pos[0]) { 255 case WLAN_EID_RSN: 256 parse->rsn = pos + 2; 257 parse->rsn_len = pos[1]; 258 ret = wpa_parse_wpa_ie_rsn(parse->rsn - 2, 259 parse->rsn_len + 2, 260 &data); 261 if (ret < 0) { 262 wpa_printf(MSG_DEBUG, "FT: Failed to parse " 263 "RSN IE: %d", ret); 264 return -1; 265 } 266 if (data.num_pmkid == 1 && data.pmkid) 267 parse->rsn_pmkid = data.pmkid; 268 break; 269 case WLAN_EID_MOBILITY_DOMAIN: 270 parse->mdie = pos + 2; 271 parse->mdie_len = pos[1]; 272 break; 273 case WLAN_EID_FAST_BSS_TRANSITION: 274 if (pos[1] < sizeof(*ftie)) 275 return -1; 276 ftie = (const struct rsn_ftie *) (pos + 2); 277 prot_ie_count = ftie->mic_control[1]; 278 if (wpa_ft_parse_ftie(pos + 2, pos[1], parse) < 0) 279 return -1; 280 break; 281 case WLAN_EID_TIMEOUT_INTERVAL: 282 parse->tie = pos + 2; 283 parse->tie_len = pos[1]; 284 break; 285 case WLAN_EID_RIC_DATA: 286 if (parse->ric == NULL) 287 parse->ric = pos; 288 break; 289 } 290 291 pos += 2 + pos[1]; 292 } 293 294 if (prot_ie_count == 0) 295 return 0; /* no MIC */ 296 297 /* 298 * Check that the protected IE count matches with IEs included in the 299 * frame. 300 */ 301 if (parse->rsn) 302 prot_ie_count--; 303 if (parse->mdie) 304 prot_ie_count--; 305 if (parse->ftie) 306 prot_ie_count--; 307 if (prot_ie_count < 0) { 308 wpa_printf(MSG_DEBUG, "FT: Some required IEs not included in " 309 "the protected IE count"); 310 return -1; 311 } 312 313 if (prot_ie_count == 0 && parse->ric) { 314 wpa_printf(MSG_DEBUG, "FT: RIC IE(s) in the frame, but not " 315 "included in protected IE count"); 316 return -1; 317 } 318 319 /* Determine the end of the RIC IE(s) */ 320 pos = parse->ric; 321 while (pos && pos + 2 <= end && pos + 2 + pos[1] <= end && 322 prot_ie_count) { 323 prot_ie_count--; 324 pos += 2 + pos[1]; 325 } 326 parse->ric_len = pos - parse->ric; 327 if (prot_ie_count) { 328 wpa_printf(MSG_DEBUG, "FT: %d protected IEs missing from " 329 "frame", (int) prot_ie_count); 330 return -1; 331 } 332 333 return 0; 334 } 335 #endif /* CONFIG_IEEE80211R */ 336 337 338 #ifndef CONFIG_NO_WPA2 339 static int rsn_selector_to_bitfield(const u8 *s) 340 { 341 if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_NONE) 342 return WPA_CIPHER_NONE; 343 if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_WEP40) 344 return WPA_CIPHER_WEP40; 345 if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_TKIP) 346 return WPA_CIPHER_TKIP; 347 if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_CCMP) 348 return WPA_CIPHER_CCMP; 349 if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_WEP104) 350 return WPA_CIPHER_WEP104; 351 #ifdef CONFIG_IEEE80211W 352 if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_AES_128_CMAC) 353 return WPA_CIPHER_AES_128_CMAC; 354 #endif /* CONFIG_IEEE80211W */ 355 if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_GCMP) 356 return WPA_CIPHER_GCMP; 357 return 0; 358 } 359 360 361 static int rsn_key_mgmt_to_bitfield(const u8 *s) 362 { 363 if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_UNSPEC_802_1X) 364 return WPA_KEY_MGMT_IEEE8021X; 365 if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X) 366 return WPA_KEY_MGMT_PSK; 367 #ifdef CONFIG_IEEE80211R 368 if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_FT_802_1X) 369 return WPA_KEY_MGMT_FT_IEEE8021X; 370 if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_FT_PSK) 371 return WPA_KEY_MGMT_FT_PSK; 372 #endif /* CONFIG_IEEE80211R */ 373 #ifdef CONFIG_IEEE80211W 374 if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_802_1X_SHA256) 375 return WPA_KEY_MGMT_IEEE8021X_SHA256; 376 if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_PSK_SHA256) 377 return WPA_KEY_MGMT_PSK_SHA256; 378 #endif /* CONFIG_IEEE80211W */ 379 #ifdef CONFIG_SAE 380 if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_SAE) 381 return WPA_KEY_MGMT_SAE; 382 if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_FT_SAE) 383 return WPA_KEY_MGMT_FT_SAE; 384 #endif /* CONFIG_SAE */ 385 return 0; 386 } 387 #endif /* CONFIG_NO_WPA2 */ 388 389 390 /** 391 * wpa_parse_wpa_ie_rsn - Parse RSN IE 392 * @rsn_ie: Buffer containing RSN IE 393 * @rsn_ie_len: RSN IE buffer length (including IE number and length octets) 394 * @data: Pointer to structure that will be filled in with parsed data 395 * Returns: 0 on success, <0 on failure 396 */ 397 int wpa_parse_wpa_ie_rsn(const u8 *rsn_ie, size_t rsn_ie_len, 398 struct wpa_ie_data *data) 399 { 400 #ifndef CONFIG_NO_WPA2 401 const struct rsn_ie_hdr *hdr; 402 const u8 *pos; 403 int left; 404 int i, count; 405 406 os_memset(data, 0, sizeof(*data)); 407 data->proto = WPA_PROTO_RSN; 408 data->pairwise_cipher = WPA_CIPHER_CCMP; 409 data->group_cipher = WPA_CIPHER_CCMP; 410 data->key_mgmt = WPA_KEY_MGMT_IEEE8021X; 411 data->capabilities = 0; 412 data->pmkid = NULL; 413 data->num_pmkid = 0; 414 #ifdef CONFIG_IEEE80211W 415 data->mgmt_group_cipher = WPA_CIPHER_AES_128_CMAC; 416 #else /* CONFIG_IEEE80211W */ 417 data->mgmt_group_cipher = 0; 418 #endif /* CONFIG_IEEE80211W */ 419 420 if (rsn_ie_len == 0) { 421 /* No RSN IE - fail silently */ 422 return -1; 423 } 424 425 if (rsn_ie_len < sizeof(struct rsn_ie_hdr)) { 426 wpa_printf(MSG_DEBUG, "%s: ie len too short %lu", 427 __func__, (unsigned long) rsn_ie_len); 428 return -1; 429 } 430 431 hdr = (const struct rsn_ie_hdr *) rsn_ie; 432 433 if (hdr->elem_id != WLAN_EID_RSN || 434 hdr->len != rsn_ie_len - 2 || 435 WPA_GET_LE16(hdr->version) != RSN_VERSION) { 436 wpa_printf(MSG_DEBUG, "%s: malformed ie or unknown version", 437 __func__); 438 return -2; 439 } 440 441 pos = (const u8 *) (hdr + 1); 442 left = rsn_ie_len - sizeof(*hdr); 443 444 if (left >= RSN_SELECTOR_LEN) { 445 data->group_cipher = rsn_selector_to_bitfield(pos); 446 #ifdef CONFIG_IEEE80211W 447 if (data->group_cipher == WPA_CIPHER_AES_128_CMAC) { 448 wpa_printf(MSG_DEBUG, "%s: AES-128-CMAC used as group " 449 "cipher", __func__); 450 return -1; 451 } 452 #endif /* CONFIG_IEEE80211W */ 453 pos += RSN_SELECTOR_LEN; 454 left -= RSN_SELECTOR_LEN; 455 } else if (left > 0) { 456 wpa_printf(MSG_DEBUG, "%s: ie length mismatch, %u too much", 457 __func__, left); 458 return -3; 459 } 460 461 if (left >= 2) { 462 data->pairwise_cipher = 0; 463 count = WPA_GET_LE16(pos); 464 pos += 2; 465 left -= 2; 466 if (count == 0 || left < count * RSN_SELECTOR_LEN) { 467 wpa_printf(MSG_DEBUG, "%s: ie count botch (pairwise), " 468 "count %u left %u", __func__, count, left); 469 return -4; 470 } 471 for (i = 0; i < count; i++) { 472 data->pairwise_cipher |= rsn_selector_to_bitfield(pos); 473 pos += RSN_SELECTOR_LEN; 474 left -= RSN_SELECTOR_LEN; 475 } 476 #ifdef CONFIG_IEEE80211W 477 if (data->pairwise_cipher & WPA_CIPHER_AES_128_CMAC) { 478 wpa_printf(MSG_DEBUG, "%s: AES-128-CMAC used as " 479 "pairwise cipher", __func__); 480 return -1; 481 } 482 #endif /* CONFIG_IEEE80211W */ 483 } else if (left == 1) { 484 wpa_printf(MSG_DEBUG, "%s: ie too short (for key mgmt)", 485 __func__); 486 return -5; 487 } 488 489 if (left >= 2) { 490 data->key_mgmt = 0; 491 count = WPA_GET_LE16(pos); 492 pos += 2; 493 left -= 2; 494 if (count == 0 || left < count * RSN_SELECTOR_LEN) { 495 wpa_printf(MSG_DEBUG, "%s: ie count botch (key mgmt), " 496 "count %u left %u", __func__, count, left); 497 return -6; 498 } 499 for (i = 0; i < count; i++) { 500 data->key_mgmt |= rsn_key_mgmt_to_bitfield(pos); 501 pos += RSN_SELECTOR_LEN; 502 left -= RSN_SELECTOR_LEN; 503 } 504 } else if (left == 1) { 505 wpa_printf(MSG_DEBUG, "%s: ie too short (for capabilities)", 506 __func__); 507 return -7; 508 } 509 510 if (left >= 2) { 511 data->capabilities = WPA_GET_LE16(pos); 512 pos += 2; 513 left -= 2; 514 } 515 516 if (left >= 2) { 517 data->num_pmkid = WPA_GET_LE16(pos); 518 pos += 2; 519 left -= 2; 520 if (left < (int) data->num_pmkid * PMKID_LEN) { 521 wpa_printf(MSG_DEBUG, "%s: PMKID underflow " 522 "(num_pmkid=%lu left=%d)", 523 __func__, (unsigned long) data->num_pmkid, 524 left); 525 data->num_pmkid = 0; 526 return -9; 527 } else { 528 data->pmkid = pos; 529 pos += data->num_pmkid * PMKID_LEN; 530 left -= data->num_pmkid * PMKID_LEN; 531 } 532 } 533 534 #ifdef CONFIG_IEEE80211W 535 if (left >= 4) { 536 data->mgmt_group_cipher = rsn_selector_to_bitfield(pos); 537 if (data->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC) { 538 wpa_printf(MSG_DEBUG, "%s: Unsupported management " 539 "group cipher 0x%x", __func__, 540 data->mgmt_group_cipher); 541 return -10; 542 } 543 pos += RSN_SELECTOR_LEN; 544 left -= RSN_SELECTOR_LEN; 545 } 546 #endif /* CONFIG_IEEE80211W */ 547 548 if (left > 0) { 549 wpa_printf(MSG_DEBUG, "%s: ie has %u trailing bytes - ignored", 550 __func__, left); 551 } 552 553 return 0; 554 #else /* CONFIG_NO_WPA2 */ 555 return -1; 556 #endif /* CONFIG_NO_WPA2 */ 557 } 558 559 560 static int wpa_selector_to_bitfield(const u8 *s) 561 { 562 if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_NONE) 563 return WPA_CIPHER_NONE; 564 if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_WEP40) 565 return WPA_CIPHER_WEP40; 566 if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_TKIP) 567 return WPA_CIPHER_TKIP; 568 if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_CCMP) 569 return WPA_CIPHER_CCMP; 570 if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_WEP104) 571 return WPA_CIPHER_WEP104; 572 return 0; 573 } 574 575 576 static int wpa_key_mgmt_to_bitfield(const u8 *s) 577 { 578 if (RSN_SELECTOR_GET(s) == WPA_AUTH_KEY_MGMT_UNSPEC_802_1X) 579 return WPA_KEY_MGMT_IEEE8021X; 580 if (RSN_SELECTOR_GET(s) == WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X) 581 return WPA_KEY_MGMT_PSK; 582 if (RSN_SELECTOR_GET(s) == WPA_AUTH_KEY_MGMT_NONE) 583 return WPA_KEY_MGMT_WPA_NONE; 584 return 0; 585 } 586 587 588 int wpa_parse_wpa_ie_wpa(const u8 *wpa_ie, size_t wpa_ie_len, 589 struct wpa_ie_data *data) 590 { 591 const struct wpa_ie_hdr *hdr; 592 const u8 *pos; 593 int left; 594 int i, count; 595 596 os_memset(data, 0, sizeof(*data)); 597 data->proto = WPA_PROTO_WPA; 598 data->pairwise_cipher = WPA_CIPHER_TKIP; 599 data->group_cipher = WPA_CIPHER_TKIP; 600 data->key_mgmt = WPA_KEY_MGMT_IEEE8021X; 601 data->capabilities = 0; 602 data->pmkid = NULL; 603 data->num_pmkid = 0; 604 data->mgmt_group_cipher = 0; 605 606 if (wpa_ie_len == 0) { 607 /* No WPA IE - fail silently */ 608 return -1; 609 } 610 611 if (wpa_ie_len < sizeof(struct wpa_ie_hdr)) { 612 wpa_printf(MSG_DEBUG, "%s: ie len too short %lu", 613 __func__, (unsigned long) wpa_ie_len); 614 return -1; 615 } 616 617 hdr = (const struct wpa_ie_hdr *) wpa_ie; 618 619 if (hdr->elem_id != WLAN_EID_VENDOR_SPECIFIC || 620 hdr->len != wpa_ie_len - 2 || 621 RSN_SELECTOR_GET(hdr->oui) != WPA_OUI_TYPE || 622 WPA_GET_LE16(hdr->version) != WPA_VERSION) { 623 wpa_printf(MSG_DEBUG, "%s: malformed ie or unknown version", 624 __func__); 625 return -2; 626 } 627 628 pos = (const u8 *) (hdr + 1); 629 left = wpa_ie_len - sizeof(*hdr); 630 631 if (left >= WPA_SELECTOR_LEN) { 632 data->group_cipher = wpa_selector_to_bitfield(pos); 633 pos += WPA_SELECTOR_LEN; 634 left -= WPA_SELECTOR_LEN; 635 } else if (left > 0) { 636 wpa_printf(MSG_DEBUG, "%s: ie length mismatch, %u too much", 637 __func__, left); 638 return -3; 639 } 640 641 if (left >= 2) { 642 data->pairwise_cipher = 0; 643 count = WPA_GET_LE16(pos); 644 pos += 2; 645 left -= 2; 646 if (count == 0 || left < count * WPA_SELECTOR_LEN) { 647 wpa_printf(MSG_DEBUG, "%s: ie count botch (pairwise), " 648 "count %u left %u", __func__, count, left); 649 return -4; 650 } 651 for (i = 0; i < count; i++) { 652 data->pairwise_cipher |= wpa_selector_to_bitfield(pos); 653 pos += WPA_SELECTOR_LEN; 654 left -= WPA_SELECTOR_LEN; 655 } 656 } else if (left == 1) { 657 wpa_printf(MSG_DEBUG, "%s: ie too short (for key mgmt)", 658 __func__); 659 return -5; 660 } 661 662 if (left >= 2) { 663 data->key_mgmt = 0; 664 count = WPA_GET_LE16(pos); 665 pos += 2; 666 left -= 2; 667 if (count == 0 || left < count * WPA_SELECTOR_LEN) { 668 wpa_printf(MSG_DEBUG, "%s: ie count botch (key mgmt), " 669 "count %u left %u", __func__, count, left); 670 return -6; 671 } 672 for (i = 0; i < count; i++) { 673 data->key_mgmt |= wpa_key_mgmt_to_bitfield(pos); 674 pos += WPA_SELECTOR_LEN; 675 left -= WPA_SELECTOR_LEN; 676 } 677 } else if (left == 1) { 678 wpa_printf(MSG_DEBUG, "%s: ie too short (for capabilities)", 679 __func__); 680 return -7; 681 } 682 683 if (left >= 2) { 684 data->capabilities = WPA_GET_LE16(pos); 685 pos += 2; 686 left -= 2; 687 } 688 689 if (left > 0) { 690 wpa_printf(MSG_DEBUG, "%s: ie has %u trailing bytes - ignored", 691 __func__, left); 692 } 693 694 return 0; 695 } 696 697 698 #ifdef CONFIG_IEEE80211R 699 700 /** 701 * wpa_derive_pmk_r0 - Derive PMK-R0 and PMKR0Name 702 * 703 * IEEE Std 802.11r-2008 - 8.5.1.5.3 704 */ 705 void wpa_derive_pmk_r0(const u8 *xxkey, size_t xxkey_len, 706 const u8 *ssid, size_t ssid_len, 707 const u8 *mdid, const u8 *r0kh_id, size_t r0kh_id_len, 708 const u8 *s0kh_id, u8 *pmk_r0, u8 *pmk_r0_name) 709 { 710 u8 buf[1 + WPA_MAX_SSID_LEN + MOBILITY_DOMAIN_ID_LEN + 1 + 711 FT_R0KH_ID_MAX_LEN + ETH_ALEN]; 712 u8 *pos, r0_key_data[48], hash[32]; 713 const u8 *addr[2]; 714 size_t len[2]; 715 716 /* 717 * R0-Key-Data = KDF-384(XXKey, "FT-R0", 718 * SSIDlength || SSID || MDID || R0KHlength || 719 * R0KH-ID || S0KH-ID) 720 * XXKey is either the second 256 bits of MSK or PSK. 721 * PMK-R0 = L(R0-Key-Data, 0, 256) 722 * PMK-R0Name-Salt = L(R0-Key-Data, 256, 128) 723 */ 724 if (ssid_len > WPA_MAX_SSID_LEN || r0kh_id_len > FT_R0KH_ID_MAX_LEN) 725 return; 726 pos = buf; 727 *pos++ = ssid_len; 728 os_memcpy(pos, ssid, ssid_len); 729 pos += ssid_len; 730 os_memcpy(pos, mdid, MOBILITY_DOMAIN_ID_LEN); 731 pos += MOBILITY_DOMAIN_ID_LEN; 732 *pos++ = r0kh_id_len; 733 os_memcpy(pos, r0kh_id, r0kh_id_len); 734 pos += r0kh_id_len; 735 os_memcpy(pos, s0kh_id, ETH_ALEN); 736 pos += ETH_ALEN; 737 738 sha256_prf(xxkey, xxkey_len, "FT-R0", buf, pos - buf, 739 r0_key_data, sizeof(r0_key_data)); 740 os_memcpy(pmk_r0, r0_key_data, PMK_LEN); 741 742 /* 743 * PMKR0Name = Truncate-128(SHA-256("FT-R0N" || PMK-R0Name-Salt) 744 */ 745 addr[0] = (const u8 *) "FT-R0N"; 746 len[0] = 6; 747 addr[1] = r0_key_data + PMK_LEN; 748 len[1] = 16; 749 750 sha256_vector(2, addr, len, hash); 751 os_memcpy(pmk_r0_name, hash, WPA_PMK_NAME_LEN); 752 } 753 754 755 /** 756 * wpa_derive_pmk_r1_name - Derive PMKR1Name 757 * 758 * IEEE Std 802.11r-2008 - 8.5.1.5.4 759 */ 760 void wpa_derive_pmk_r1_name(const u8 *pmk_r0_name, const u8 *r1kh_id, 761 const u8 *s1kh_id, u8 *pmk_r1_name) 762 { 763 u8 hash[32]; 764 const u8 *addr[4]; 765 size_t len[4]; 766 767 /* 768 * PMKR1Name = Truncate-128(SHA-256("FT-R1N" || PMKR0Name || 769 * R1KH-ID || S1KH-ID)) 770 */ 771 addr[0] = (const u8 *) "FT-R1N"; 772 len[0] = 6; 773 addr[1] = pmk_r0_name; 774 len[1] = WPA_PMK_NAME_LEN; 775 addr[2] = r1kh_id; 776 len[2] = FT_R1KH_ID_LEN; 777 addr[3] = s1kh_id; 778 len[3] = ETH_ALEN; 779 780 sha256_vector(4, addr, len, hash); 781 os_memcpy(pmk_r1_name, hash, WPA_PMK_NAME_LEN); 782 } 783 784 785 /** 786 * wpa_derive_pmk_r1 - Derive PMK-R1 and PMKR1Name from PMK-R0 787 * 788 * IEEE Std 802.11r-2008 - 8.5.1.5.4 789 */ 790 void wpa_derive_pmk_r1(const u8 *pmk_r0, const u8 *pmk_r0_name, 791 const u8 *r1kh_id, const u8 *s1kh_id, 792 u8 *pmk_r1, u8 *pmk_r1_name) 793 { 794 u8 buf[FT_R1KH_ID_LEN + ETH_ALEN]; 795 u8 *pos; 796 797 /* PMK-R1 = KDF-256(PMK-R0, "FT-R1", R1KH-ID || S1KH-ID) */ 798 pos = buf; 799 os_memcpy(pos, r1kh_id, FT_R1KH_ID_LEN); 800 pos += FT_R1KH_ID_LEN; 801 os_memcpy(pos, s1kh_id, ETH_ALEN); 802 pos += ETH_ALEN; 803 804 sha256_prf(pmk_r0, PMK_LEN, "FT-R1", buf, pos - buf, pmk_r1, PMK_LEN); 805 806 wpa_derive_pmk_r1_name(pmk_r0_name, r1kh_id, s1kh_id, pmk_r1_name); 807 } 808 809 810 /** 811 * wpa_pmk_r1_to_ptk - Derive PTK and PTKName from PMK-R1 812 * 813 * IEEE Std 802.11r-2008 - 8.5.1.5.5 814 */ 815 void wpa_pmk_r1_to_ptk(const u8 *pmk_r1, const u8 *snonce, const u8 *anonce, 816 const u8 *sta_addr, const u8 *bssid, 817 const u8 *pmk_r1_name, 818 u8 *ptk, size_t ptk_len, u8 *ptk_name) 819 { 820 u8 buf[2 * WPA_NONCE_LEN + 2 * ETH_ALEN]; 821 u8 *pos, hash[32]; 822 const u8 *addr[6]; 823 size_t len[6]; 824 825 /* 826 * PTK = KDF-PTKLen(PMK-R1, "FT-PTK", SNonce || ANonce || 827 * BSSID || STA-ADDR) 828 */ 829 pos = buf; 830 os_memcpy(pos, snonce, WPA_NONCE_LEN); 831 pos += WPA_NONCE_LEN; 832 os_memcpy(pos, anonce, WPA_NONCE_LEN); 833 pos += WPA_NONCE_LEN; 834 os_memcpy(pos, bssid, ETH_ALEN); 835 pos += ETH_ALEN; 836 os_memcpy(pos, sta_addr, ETH_ALEN); 837 pos += ETH_ALEN; 838 839 sha256_prf(pmk_r1, PMK_LEN, "FT-PTK", buf, pos - buf, ptk, ptk_len); 840 841 /* 842 * PTKName = Truncate-128(SHA-256(PMKR1Name || "FT-PTKN" || SNonce || 843 * ANonce || BSSID || STA-ADDR)) 844 */ 845 addr[0] = pmk_r1_name; 846 len[0] = WPA_PMK_NAME_LEN; 847 addr[1] = (const u8 *) "FT-PTKN"; 848 len[1] = 7; 849 addr[2] = snonce; 850 len[2] = WPA_NONCE_LEN; 851 addr[3] = anonce; 852 len[3] = WPA_NONCE_LEN; 853 addr[4] = bssid; 854 len[4] = ETH_ALEN; 855 addr[5] = sta_addr; 856 len[5] = ETH_ALEN; 857 858 sha256_vector(6, addr, len, hash); 859 os_memcpy(ptk_name, hash, WPA_PMK_NAME_LEN); 860 } 861 862 #endif /* CONFIG_IEEE80211R */ 863 864 865 /** 866 * rsn_pmkid - Calculate PMK identifier 867 * @pmk: Pairwise master key 868 * @pmk_len: Length of pmk in bytes 869 * @aa: Authenticator address 870 * @spa: Supplicant address 871 * @pmkid: Buffer for PMKID 872 * @use_sha256: Whether to use SHA256-based KDF 873 * 874 * IEEE Std 802.11i-2004 - 8.5.1.2 Pairwise key hierarchy 875 * PMKID = HMAC-SHA1-128(PMK, "PMK Name" || AA || SPA) 876 */ 877 void rsn_pmkid(const u8 *pmk, size_t pmk_len, const u8 *aa, const u8 *spa, 878 u8 *pmkid, int use_sha256) 879 { 880 char *title = "PMK Name"; 881 const u8 *addr[3]; 882 const size_t len[3] = { 8, ETH_ALEN, ETH_ALEN }; 883 unsigned char hash[SHA256_MAC_LEN]; 884 885 addr[0] = (u8 *) title; 886 addr[1] = aa; 887 addr[2] = spa; 888 889 #ifdef CONFIG_IEEE80211W 890 if (use_sha256) 891 hmac_sha256_vector(pmk, pmk_len, 3, addr, len, hash); 892 else 893 #endif /* CONFIG_IEEE80211W */ 894 hmac_sha1_vector(pmk, pmk_len, 3, addr, len, hash); 895 os_memcpy(pmkid, hash, PMKID_LEN); 896 } 897 898 899 /** 900 * wpa_cipher_txt - Convert cipher suite to a text string 901 * @cipher: Cipher suite (WPA_CIPHER_* enum) 902 * Returns: Pointer to a text string of the cipher suite name 903 */ 904 const char * wpa_cipher_txt(int cipher) 905 { 906 switch (cipher) { 907 case WPA_CIPHER_NONE: 908 return "NONE"; 909 case WPA_CIPHER_WEP40: 910 return "WEP-40"; 911 case WPA_CIPHER_WEP104: 912 return "WEP-104"; 913 case WPA_CIPHER_TKIP: 914 return "TKIP"; 915 case WPA_CIPHER_CCMP: 916 return "CCMP"; 917 case WPA_CIPHER_CCMP | WPA_CIPHER_TKIP: 918 return "CCMP+TKIP"; 919 case WPA_CIPHER_GCMP: 920 return "GCMP"; 921 default: 922 return "UNKNOWN"; 923 } 924 } 925 926 927 /** 928 * wpa_key_mgmt_txt - Convert key management suite to a text string 929 * @key_mgmt: Key management suite (WPA_KEY_MGMT_* enum) 930 * @proto: WPA/WPA2 version (WPA_PROTO_*) 931 * Returns: Pointer to a text string of the key management suite name 932 */ 933 const char * wpa_key_mgmt_txt(int key_mgmt, int proto) 934 { 935 switch (key_mgmt) { 936 case WPA_KEY_MGMT_IEEE8021X: 937 if (proto == (WPA_PROTO_RSN | WPA_PROTO_WPA)) 938 return "WPA2+WPA/IEEE 802.1X/EAP"; 939 return proto == WPA_PROTO_RSN ? 940 "WPA2/IEEE 802.1X/EAP" : "WPA/IEEE 802.1X/EAP"; 941 case WPA_KEY_MGMT_PSK: 942 if (proto == (WPA_PROTO_RSN | WPA_PROTO_WPA)) 943 return "WPA2-PSK+WPA-PSK"; 944 return proto == WPA_PROTO_RSN ? 945 "WPA2-PSK" : "WPA-PSK"; 946 case WPA_KEY_MGMT_NONE: 947 return "NONE"; 948 case WPA_KEY_MGMT_IEEE8021X_NO_WPA: 949 return "IEEE 802.1X (no WPA)"; 950 #ifdef CONFIG_IEEE80211R 951 case WPA_KEY_MGMT_FT_IEEE8021X: 952 return "FT-EAP"; 953 case WPA_KEY_MGMT_FT_PSK: 954 return "FT-PSK"; 955 #endif /* CONFIG_IEEE80211R */ 956 #ifdef CONFIG_IEEE80211W 957 case WPA_KEY_MGMT_IEEE8021X_SHA256: 958 return "WPA2-EAP-SHA256"; 959 case WPA_KEY_MGMT_PSK_SHA256: 960 return "WPA2-PSK-SHA256"; 961 #endif /* CONFIG_IEEE80211W */ 962 default: 963 return "UNKNOWN"; 964 } 965 } 966 967 968 int wpa_compare_rsn_ie(int ft_initial_assoc, 969 const u8 *ie1, size_t ie1len, 970 const u8 *ie2, size_t ie2len) 971 { 972 if (ie1 == NULL || ie2 == NULL) 973 return -1; 974 975 if (ie1len == ie2len && os_memcmp(ie1, ie2, ie1len) == 0) 976 return 0; /* identical IEs */ 977 978 #ifdef CONFIG_IEEE80211R 979 if (ft_initial_assoc) { 980 struct wpa_ie_data ie1d, ie2d; 981 /* 982 * The PMKID-List in RSN IE is different between Beacon/Probe 983 * Response/(Re)Association Request frames and EAPOL-Key 984 * messages in FT initial mobility domain association. Allow 985 * for this, but verify that other parts of the RSN IEs are 986 * identical. 987 */ 988 if (wpa_parse_wpa_ie_rsn(ie1, ie1len, &ie1d) < 0 || 989 wpa_parse_wpa_ie_rsn(ie2, ie2len, &ie2d) < 0) 990 return -1; 991 if (ie1d.proto == ie2d.proto && 992 ie1d.pairwise_cipher == ie2d.pairwise_cipher && 993 ie1d.group_cipher == ie2d.group_cipher && 994 ie1d.key_mgmt == ie2d.key_mgmt && 995 ie1d.capabilities == ie2d.capabilities && 996 ie1d.mgmt_group_cipher == ie2d.mgmt_group_cipher) 997 return 0; 998 } 999 #endif /* CONFIG_IEEE80211R */ 1000 1001 return -1; 1002 } 1003 1004 1005 #ifdef CONFIG_IEEE80211R 1006 int wpa_insert_pmkid(u8 *ies, size_t ies_len, const u8 *pmkid) 1007 { 1008 u8 *start, *end, *rpos, *rend; 1009 int added = 0; 1010 1011 start = ies; 1012 end = ies + ies_len; 1013 1014 while (start < end) { 1015 if (*start == WLAN_EID_RSN) 1016 break; 1017 start += 2 + start[1]; 1018 } 1019 if (start >= end) { 1020 wpa_printf(MSG_ERROR, "FT: Could not find RSN IE in " 1021 "IEs data"); 1022 return -1; 1023 } 1024 wpa_hexdump(MSG_DEBUG, "FT: RSN IE before modification", 1025 start, 2 + start[1]); 1026 1027 /* Find start of PMKID-Count */ 1028 rpos = start + 2; 1029 rend = rpos + start[1]; 1030 1031 /* Skip Version and Group Data Cipher Suite */ 1032 rpos += 2 + 4; 1033 /* Skip Pairwise Cipher Suite Count and List */ 1034 rpos += 2 + WPA_GET_LE16(rpos) * RSN_SELECTOR_LEN; 1035 /* Skip AKM Suite Count and List */ 1036 rpos += 2 + WPA_GET_LE16(rpos) * RSN_SELECTOR_LEN; 1037 1038 if (rpos == rend) { 1039 /* Add RSN Capabilities */ 1040 os_memmove(rpos + 2, rpos, end - rpos); 1041 *rpos++ = 0; 1042 *rpos++ = 0; 1043 } else { 1044 /* Skip RSN Capabilities */ 1045 rpos += 2; 1046 if (rpos > rend) { 1047 wpa_printf(MSG_ERROR, "FT: Could not parse RSN IE in " 1048 "IEs data"); 1049 return -1; 1050 } 1051 } 1052 1053 if (rpos == rend) { 1054 /* No PMKID-Count field included; add it */ 1055 os_memmove(rpos + 2 + PMKID_LEN, rpos, end - rpos); 1056 WPA_PUT_LE16(rpos, 1); 1057 rpos += 2; 1058 os_memcpy(rpos, pmkid, PMKID_LEN); 1059 added += 2 + PMKID_LEN; 1060 start[1] += 2 + PMKID_LEN; 1061 } else { 1062 /* PMKID-Count was included; use it */ 1063 if (WPA_GET_LE16(rpos) != 0) { 1064 wpa_printf(MSG_ERROR, "FT: Unexpected PMKID " 1065 "in RSN IE in EAPOL-Key data"); 1066 return -1; 1067 } 1068 WPA_PUT_LE16(rpos, 1); 1069 rpos += 2; 1070 os_memmove(rpos + PMKID_LEN, rpos, end - rpos); 1071 os_memcpy(rpos, pmkid, PMKID_LEN); 1072 added += PMKID_LEN; 1073 start[1] += PMKID_LEN; 1074 } 1075 1076 wpa_hexdump(MSG_DEBUG, "FT: RSN IE after modification " 1077 "(PMKID inserted)", start, 2 + start[1]); 1078 1079 return added; 1080 } 1081 #endif /* CONFIG_IEEE80211R */ 1082 1083 1084 int wpa_cipher_key_len(int cipher) 1085 { 1086 switch (cipher) { 1087 case WPA_CIPHER_CCMP: 1088 case WPA_CIPHER_GCMP: 1089 return 16; 1090 case WPA_CIPHER_TKIP: 1091 return 32; 1092 case WPA_CIPHER_WEP104: 1093 return 13; 1094 case WPA_CIPHER_WEP40: 1095 return 5; 1096 } 1097 1098 return 0; 1099 } 1100 1101 1102 int wpa_cipher_rsc_len(int cipher) 1103 { 1104 switch (cipher) { 1105 case WPA_CIPHER_CCMP: 1106 case WPA_CIPHER_GCMP: 1107 case WPA_CIPHER_TKIP: 1108 return 6; 1109 case WPA_CIPHER_WEP104: 1110 case WPA_CIPHER_WEP40: 1111 return 0; 1112 } 1113 1114 return 0; 1115 } 1116 1117 1118 int wpa_cipher_to_alg(int cipher) 1119 { 1120 switch (cipher) { 1121 case WPA_CIPHER_CCMP: 1122 return WPA_ALG_CCMP; 1123 case WPA_CIPHER_GCMP: 1124 return WPA_ALG_GCMP; 1125 case WPA_CIPHER_TKIP: 1126 return WPA_ALG_TKIP; 1127 case WPA_CIPHER_WEP104: 1128 case WPA_CIPHER_WEP40: 1129 return WPA_ALG_WEP; 1130 } 1131 return WPA_ALG_NONE; 1132 } 1133 1134 1135 enum wpa_cipher wpa_cipher_to_suite_driver(int cipher) 1136 { 1137 switch (cipher) { 1138 case WPA_CIPHER_NONE: 1139 return CIPHER_NONE; 1140 case WPA_CIPHER_WEP40: 1141 return CIPHER_WEP40; 1142 case WPA_CIPHER_WEP104: 1143 return CIPHER_WEP104; 1144 case WPA_CIPHER_CCMP: 1145 return CIPHER_CCMP; 1146 case WPA_CIPHER_GCMP: 1147 return CIPHER_GCMP; 1148 case WPA_CIPHER_TKIP: 1149 default: 1150 return CIPHER_TKIP; 1151 } 1152 } 1153 1154 1155 int wpa_cipher_valid_pairwise(int cipher) 1156 { 1157 return cipher == WPA_CIPHER_CCMP || 1158 cipher == WPA_CIPHER_GCMP || 1159 cipher == WPA_CIPHER_TKIP; 1160 } 1161 1162 1163 u32 wpa_cipher_to_suite(int proto, int cipher) 1164 { 1165 if (cipher & WPA_CIPHER_CCMP) 1166 return (proto == WPA_PROTO_RSN ? 1167 RSN_CIPHER_SUITE_CCMP : WPA_CIPHER_SUITE_CCMP); 1168 if (cipher & WPA_CIPHER_GCMP) 1169 return RSN_CIPHER_SUITE_GCMP; 1170 if (cipher & WPA_CIPHER_TKIP) 1171 return (proto == WPA_PROTO_RSN ? 1172 RSN_CIPHER_SUITE_TKIP : WPA_CIPHER_SUITE_TKIP); 1173 if (cipher & WPA_CIPHER_WEP104) 1174 return (proto == WPA_PROTO_RSN ? 1175 RSN_CIPHER_SUITE_WEP104 : WPA_CIPHER_SUITE_WEP104); 1176 if (cipher & WPA_CIPHER_WEP40) 1177 return (proto == WPA_PROTO_RSN ? 1178 RSN_CIPHER_SUITE_WEP40 : WPA_CIPHER_SUITE_WEP40); 1179 if (cipher & WPA_CIPHER_NONE) 1180 return (proto == WPA_PROTO_RSN ? 1181 RSN_CIPHER_SUITE_NONE : WPA_CIPHER_SUITE_NONE); 1182 return 0; 1183 } 1184 1185 1186 int rsn_cipher_put_suites(u8 *pos, int ciphers) 1187 { 1188 int num_suites = 0; 1189 1190 if (ciphers & WPA_CIPHER_CCMP) { 1191 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP); 1192 pos += RSN_SELECTOR_LEN; 1193 num_suites++; 1194 } 1195 if (ciphers & WPA_CIPHER_GCMP) { 1196 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_GCMP); 1197 pos += RSN_SELECTOR_LEN; 1198 num_suites++; 1199 } 1200 if (ciphers & WPA_CIPHER_TKIP) { 1201 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP); 1202 pos += RSN_SELECTOR_LEN; 1203 num_suites++; 1204 } 1205 if (ciphers & WPA_CIPHER_NONE) { 1206 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NONE); 1207 pos += RSN_SELECTOR_LEN; 1208 num_suites++; 1209 } 1210 1211 return num_suites; 1212 } 1213 1214 1215 int wpa_cipher_put_suites(u8 *pos, int ciphers) 1216 { 1217 int num_suites = 0; 1218 1219 if (ciphers & WPA_CIPHER_CCMP) { 1220 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_CCMP); 1221 pos += WPA_SELECTOR_LEN; 1222 num_suites++; 1223 } 1224 if (ciphers & WPA_CIPHER_TKIP) { 1225 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_TKIP); 1226 pos += WPA_SELECTOR_LEN; 1227 num_suites++; 1228 } 1229 if (ciphers & WPA_CIPHER_NONE) { 1230 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_NONE); 1231 pos += WPA_SELECTOR_LEN; 1232 num_suites++; 1233 } 1234 1235 return num_suites; 1236 } 1237 1238 1239 int wpa_pick_pairwise_cipher(int ciphers, int none_allowed) 1240 { 1241 if (ciphers & WPA_CIPHER_CCMP) 1242 return WPA_CIPHER_CCMP; 1243 if (ciphers & WPA_CIPHER_GCMP) 1244 return WPA_CIPHER_GCMP; 1245 if (ciphers & WPA_CIPHER_TKIP) 1246 return WPA_CIPHER_TKIP; 1247 if (none_allowed && (ciphers & WPA_CIPHER_NONE)) 1248 return WPA_CIPHER_NONE; 1249 return -1; 1250 } 1251 1252 1253 int wpa_pick_group_cipher(int ciphers) 1254 { 1255 if (ciphers & WPA_CIPHER_CCMP) 1256 return WPA_CIPHER_CCMP; 1257 if (ciphers & WPA_CIPHER_GCMP) 1258 return WPA_CIPHER_GCMP; 1259 if (ciphers & WPA_CIPHER_TKIP) 1260 return WPA_CIPHER_TKIP; 1261 if (ciphers & WPA_CIPHER_WEP104) 1262 return WPA_CIPHER_WEP104; 1263 if (ciphers & WPA_CIPHER_WEP40) 1264 return WPA_CIPHER_WEP40; 1265 return -1; 1266 } 1267 1268 1269 int wpa_parse_cipher(const char *value) 1270 { 1271 int val = 0, last; 1272 char *start, *end, *buf; 1273 1274 buf = os_strdup(value); 1275 if (buf == NULL) 1276 return -1; 1277 start = buf; 1278 1279 while (*start != '\0') { 1280 while (*start == ' ' || *start == '\t') 1281 start++; 1282 if (*start == '\0') 1283 break; 1284 end = start; 1285 while (*end != ' ' && *end != '\t' && *end != '\0') 1286 end++; 1287 last = *end == '\0'; 1288 *end = '\0'; 1289 if (os_strcmp(start, "CCMP") == 0) 1290 val |= WPA_CIPHER_CCMP; 1291 else if (os_strcmp(start, "GCMP") == 0) 1292 val |= WPA_CIPHER_GCMP; 1293 else if (os_strcmp(start, "TKIP") == 0) 1294 val |= WPA_CIPHER_TKIP; 1295 else if (os_strcmp(start, "WEP104") == 0) 1296 val |= WPA_CIPHER_WEP104; 1297 else if (os_strcmp(start, "WEP40") == 0) 1298 val |= WPA_CIPHER_WEP40; 1299 else if (os_strcmp(start, "NONE") == 0) 1300 val |= WPA_CIPHER_NONE; 1301 else { 1302 os_free(buf); 1303 return -1; 1304 } 1305 1306 if (last) 1307 break; 1308 start = end + 1; 1309 } 1310 os_free(buf); 1311 1312 return val; 1313 } 1314 1315 1316 int wpa_write_ciphers(char *start, char *end, int ciphers, const char *delim) 1317 { 1318 char *pos = start; 1319 int ret; 1320 1321 if (ciphers & WPA_CIPHER_CCMP) { 1322 ret = os_snprintf(pos, end - pos, "%sCCMP", 1323 pos == start ? "" : delim); 1324 if (ret < 0 || ret >= end - pos) 1325 return -1; 1326 pos += ret; 1327 } 1328 if (ciphers & WPA_CIPHER_GCMP) { 1329 ret = os_snprintf(pos, end - pos, "%sGCMP", 1330 pos == start ? "" : delim); 1331 if (ret < 0 || ret >= end - pos) 1332 return -1; 1333 pos += ret; 1334 } 1335 if (ciphers & WPA_CIPHER_TKIP) { 1336 ret = os_snprintf(pos, end - pos, "%sTKIP", 1337 pos == start ? "" : delim); 1338 if (ret < 0 || ret >= end - pos) 1339 return -1; 1340 pos += ret; 1341 } 1342 if (ciphers & WPA_CIPHER_WEP104) { 1343 ret = os_snprintf(pos, end - pos, "%sWEP104", 1344 pos == start ? "" : delim); 1345 if (ret < 0 || ret >= end - pos) 1346 return -1; 1347 pos += ret; 1348 } 1349 if (ciphers & WPA_CIPHER_WEP40) { 1350 ret = os_snprintf(pos, end - pos, "%sWEP40", 1351 pos == start ? "" : delim); 1352 if (ret < 0 || ret >= end - pos) 1353 return -1; 1354 pos += ret; 1355 } 1356 if (ciphers & WPA_CIPHER_NONE) { 1357 ret = os_snprintf(pos, end - pos, "%sNONE", 1358 pos == start ? "" : delim); 1359 if (ret < 0 || ret >= end - pos) 1360 return -1; 1361 pos += ret; 1362 } 1363 1364 return pos - start; 1365 } 1366 1367 1368 int wpa_select_ap_group_cipher(int wpa, int wpa_pairwise, int rsn_pairwise) 1369 { 1370 int pairwise = 0; 1371 1372 /* Select group cipher based on the enabled pairwise cipher suites */ 1373 if (wpa & 1) 1374 pairwise |= wpa_pairwise; 1375 if (wpa & 2) 1376 pairwise |= rsn_pairwise; 1377 1378 if (pairwise & WPA_CIPHER_TKIP) 1379 return WPA_CIPHER_TKIP; 1380 if ((pairwise & (WPA_CIPHER_CCMP | WPA_CIPHER_GCMP)) == WPA_CIPHER_GCMP) 1381 return WPA_CIPHER_GCMP; 1382 return WPA_CIPHER_CCMP; 1383 } 1384
