wpa_common.c revision 34af306c42b7ccf956508e7cd23f0ba90606e360
1/* 2 * WPA/RSN - Shared functions for supplicant and authenticator 3 * Copyright (c) 2002-2013, Jouni Malinen <j@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 */ 40int 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 */ 89void 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 133int 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 189static 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 238int 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 338static int rsn_selector_to_bitfield(const u8 *s) 339{ 340 if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_NONE) 341 return WPA_CIPHER_NONE; 342 if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_WEP40) 343 return WPA_CIPHER_WEP40; 344 if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_TKIP) 345 return WPA_CIPHER_TKIP; 346 if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_CCMP) 347 return WPA_CIPHER_CCMP; 348 if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_WEP104) 349 return WPA_CIPHER_WEP104; 350#ifdef CONFIG_IEEE80211W 351 if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_AES_128_CMAC) 352 return WPA_CIPHER_AES_128_CMAC; 353#endif /* CONFIG_IEEE80211W */ 354 if (RSN_SELECTOR_GET(s) == RSN_CIPHER_SUITE_GCMP) 355 return WPA_CIPHER_GCMP; 356 return 0; 357} 358 359 360static int rsn_key_mgmt_to_bitfield(const u8 *s) 361{ 362 if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_UNSPEC_802_1X) 363 return WPA_KEY_MGMT_IEEE8021X; 364 if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X) 365 return WPA_KEY_MGMT_PSK; 366#ifdef CONFIG_IEEE80211R 367 if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_FT_802_1X) 368 return WPA_KEY_MGMT_FT_IEEE8021X; 369 if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_FT_PSK) 370 return WPA_KEY_MGMT_FT_PSK; 371#endif /* CONFIG_IEEE80211R */ 372#ifdef CONFIG_IEEE80211W 373 if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_802_1X_SHA256) 374 return WPA_KEY_MGMT_IEEE8021X_SHA256; 375 if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_PSK_SHA256) 376 return WPA_KEY_MGMT_PSK_SHA256; 377#endif /* CONFIG_IEEE80211W */ 378#ifdef CONFIG_SAE 379 if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_SAE) 380 return WPA_KEY_MGMT_SAE; 381 if (RSN_SELECTOR_GET(s) == RSN_AUTH_KEY_MGMT_FT_SAE) 382 return WPA_KEY_MGMT_FT_SAE; 383#endif /* CONFIG_SAE */ 384 return 0; 385} 386 387 388/** 389 * wpa_parse_wpa_ie_rsn - Parse RSN IE 390 * @rsn_ie: Buffer containing RSN IE 391 * @rsn_ie_len: RSN IE buffer length (including IE number and length octets) 392 * @data: Pointer to structure that will be filled in with parsed data 393 * Returns: 0 on success, <0 on failure 394 */ 395int wpa_parse_wpa_ie_rsn(const u8 *rsn_ie, size_t rsn_ie_len, 396 struct wpa_ie_data *data) 397{ 398 const struct rsn_ie_hdr *hdr; 399 const u8 *pos; 400 int left; 401 int i, count; 402 403 os_memset(data, 0, sizeof(*data)); 404 data->proto = WPA_PROTO_RSN; 405 data->pairwise_cipher = WPA_CIPHER_CCMP; 406 data->group_cipher = WPA_CIPHER_CCMP; 407 data->key_mgmt = WPA_KEY_MGMT_IEEE8021X; 408 data->capabilities = 0; 409 data->pmkid = NULL; 410 data->num_pmkid = 0; 411#ifdef CONFIG_IEEE80211W 412 data->mgmt_group_cipher = WPA_CIPHER_AES_128_CMAC; 413#else /* CONFIG_IEEE80211W */ 414 data->mgmt_group_cipher = 0; 415#endif /* CONFIG_IEEE80211W */ 416 417 if (rsn_ie_len == 0) { 418 /* No RSN IE - fail silently */ 419 return -1; 420 } 421 422 if (rsn_ie_len < sizeof(struct rsn_ie_hdr)) { 423 wpa_printf(MSG_DEBUG, "%s: ie len too short %lu", 424 __func__, (unsigned long) rsn_ie_len); 425 return -1; 426 } 427 428 hdr = (const struct rsn_ie_hdr *) rsn_ie; 429 430 if (hdr->elem_id != WLAN_EID_RSN || 431 hdr->len != rsn_ie_len - 2 || 432 WPA_GET_LE16(hdr->version) != RSN_VERSION) { 433 wpa_printf(MSG_DEBUG, "%s: malformed ie or unknown version", 434 __func__); 435 return -2; 436 } 437 438 pos = (const u8 *) (hdr + 1); 439 left = rsn_ie_len - sizeof(*hdr); 440 441 if (left >= RSN_SELECTOR_LEN) { 442 data->group_cipher = rsn_selector_to_bitfield(pos); 443#ifdef CONFIG_IEEE80211W 444 if (data->group_cipher == WPA_CIPHER_AES_128_CMAC) { 445 wpa_printf(MSG_DEBUG, "%s: AES-128-CMAC used as group " 446 "cipher", __func__); 447 return -1; 448 } 449#endif /* CONFIG_IEEE80211W */ 450 pos += RSN_SELECTOR_LEN; 451 left -= RSN_SELECTOR_LEN; 452 } else if (left > 0) { 453 wpa_printf(MSG_DEBUG, "%s: ie length mismatch, %u too much", 454 __func__, left); 455 return -3; 456 } 457 458 if (left >= 2) { 459 data->pairwise_cipher = 0; 460 count = WPA_GET_LE16(pos); 461 pos += 2; 462 left -= 2; 463 if (count == 0 || left < count * RSN_SELECTOR_LEN) { 464 wpa_printf(MSG_DEBUG, "%s: ie count botch (pairwise), " 465 "count %u left %u", __func__, count, left); 466 return -4; 467 } 468 for (i = 0; i < count; i++) { 469 data->pairwise_cipher |= rsn_selector_to_bitfield(pos); 470 pos += RSN_SELECTOR_LEN; 471 left -= RSN_SELECTOR_LEN; 472 } 473#ifdef CONFIG_IEEE80211W 474 if (data->pairwise_cipher & WPA_CIPHER_AES_128_CMAC) { 475 wpa_printf(MSG_DEBUG, "%s: AES-128-CMAC used as " 476 "pairwise cipher", __func__); 477 return -1; 478 } 479#endif /* CONFIG_IEEE80211W */ 480 } else if (left == 1) { 481 wpa_printf(MSG_DEBUG, "%s: ie too short (for key mgmt)", 482 __func__); 483 return -5; 484 } 485 486 if (left >= 2) { 487 data->key_mgmt = 0; 488 count = WPA_GET_LE16(pos); 489 pos += 2; 490 left -= 2; 491 if (count == 0 || left < count * RSN_SELECTOR_LEN) { 492 wpa_printf(MSG_DEBUG, "%s: ie count botch (key mgmt), " 493 "count %u left %u", __func__, count, left); 494 return -6; 495 } 496 for (i = 0; i < count; i++) { 497 data->key_mgmt |= rsn_key_mgmt_to_bitfield(pos); 498 pos += RSN_SELECTOR_LEN; 499 left -= RSN_SELECTOR_LEN; 500 } 501 } else if (left == 1) { 502 wpa_printf(MSG_DEBUG, "%s: ie too short (for capabilities)", 503 __func__); 504 return -7; 505 } 506 507 if (left >= 2) { 508 data->capabilities = WPA_GET_LE16(pos); 509 pos += 2; 510 left -= 2; 511 } 512 513 if (left >= 2) { 514 data->num_pmkid = WPA_GET_LE16(pos); 515 pos += 2; 516 left -= 2; 517 if (left < (int) data->num_pmkid * PMKID_LEN) { 518 wpa_printf(MSG_DEBUG, "%s: PMKID underflow " 519 "(num_pmkid=%lu left=%d)", 520 __func__, (unsigned long) data->num_pmkid, 521 left); 522 data->num_pmkid = 0; 523 return -9; 524 } else { 525 data->pmkid = pos; 526 pos += data->num_pmkid * PMKID_LEN; 527 left -= data->num_pmkid * PMKID_LEN; 528 } 529 } 530 531#ifdef CONFIG_IEEE80211W 532 if (left >= 4) { 533 data->mgmt_group_cipher = rsn_selector_to_bitfield(pos); 534 if (data->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC) { 535 wpa_printf(MSG_DEBUG, "%s: Unsupported management " 536 "group cipher 0x%x", __func__, 537 data->mgmt_group_cipher); 538 return -10; 539 } 540 pos += RSN_SELECTOR_LEN; 541 left -= RSN_SELECTOR_LEN; 542 } 543#endif /* CONFIG_IEEE80211W */ 544 545 if (left > 0) { 546 wpa_printf(MSG_DEBUG, "%s: ie has %u trailing bytes - ignored", 547 __func__, left); 548 } 549 550 return 0; 551} 552 553 554static int wpa_selector_to_bitfield(const u8 *s) 555{ 556 if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_NONE) 557 return WPA_CIPHER_NONE; 558 if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_WEP40) 559 return WPA_CIPHER_WEP40; 560 if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_TKIP) 561 return WPA_CIPHER_TKIP; 562 if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_CCMP) 563 return WPA_CIPHER_CCMP; 564 if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_WEP104) 565 return WPA_CIPHER_WEP104; 566 return 0; 567} 568 569 570static int wpa_key_mgmt_to_bitfield(const u8 *s) 571{ 572 if (RSN_SELECTOR_GET(s) == WPA_AUTH_KEY_MGMT_UNSPEC_802_1X) 573 return WPA_KEY_MGMT_IEEE8021X; 574 if (RSN_SELECTOR_GET(s) == WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X) 575 return WPA_KEY_MGMT_PSK; 576 if (RSN_SELECTOR_GET(s) == WPA_AUTH_KEY_MGMT_NONE) 577 return WPA_KEY_MGMT_WPA_NONE; 578 return 0; 579} 580 581 582int wpa_parse_wpa_ie_wpa(const u8 *wpa_ie, size_t wpa_ie_len, 583 struct wpa_ie_data *data) 584{ 585 const struct wpa_ie_hdr *hdr; 586 const u8 *pos; 587 int left; 588 int i, count; 589 590 os_memset(data, 0, sizeof(*data)); 591 data->proto = WPA_PROTO_WPA; 592 data->pairwise_cipher = WPA_CIPHER_TKIP; 593 data->group_cipher = WPA_CIPHER_TKIP; 594 data->key_mgmt = WPA_KEY_MGMT_IEEE8021X; 595 data->capabilities = 0; 596 data->pmkid = NULL; 597 data->num_pmkid = 0; 598 data->mgmt_group_cipher = 0; 599 600 if (wpa_ie_len == 0) { 601 /* No WPA IE - fail silently */ 602 return -1; 603 } 604 605 if (wpa_ie_len < sizeof(struct wpa_ie_hdr)) { 606 wpa_printf(MSG_DEBUG, "%s: ie len too short %lu", 607 __func__, (unsigned long) wpa_ie_len); 608 return -1; 609 } 610 611 hdr = (const struct wpa_ie_hdr *) wpa_ie; 612 613 if (hdr->elem_id != WLAN_EID_VENDOR_SPECIFIC || 614 hdr->len != wpa_ie_len - 2 || 615 RSN_SELECTOR_GET(hdr->oui) != WPA_OUI_TYPE || 616 WPA_GET_LE16(hdr->version) != WPA_VERSION) { 617 wpa_printf(MSG_DEBUG, "%s: malformed ie or unknown version", 618 __func__); 619 return -2; 620 } 621 622 pos = (const u8 *) (hdr + 1); 623 left = wpa_ie_len - sizeof(*hdr); 624 625 if (left >= WPA_SELECTOR_LEN) { 626 data->group_cipher = wpa_selector_to_bitfield(pos); 627 pos += WPA_SELECTOR_LEN; 628 left -= WPA_SELECTOR_LEN; 629 } else if (left > 0) { 630 wpa_printf(MSG_DEBUG, "%s: ie length mismatch, %u too much", 631 __func__, left); 632 return -3; 633 } 634 635 if (left >= 2) { 636 data->pairwise_cipher = 0; 637 count = WPA_GET_LE16(pos); 638 pos += 2; 639 left -= 2; 640 if (count == 0 || left < count * WPA_SELECTOR_LEN) { 641 wpa_printf(MSG_DEBUG, "%s: ie count botch (pairwise), " 642 "count %u left %u", __func__, count, left); 643 return -4; 644 } 645 for (i = 0; i < count; i++) { 646 data->pairwise_cipher |= wpa_selector_to_bitfield(pos); 647 pos += WPA_SELECTOR_LEN; 648 left -= WPA_SELECTOR_LEN; 649 } 650 } else if (left == 1) { 651 wpa_printf(MSG_DEBUG, "%s: ie too short (for key mgmt)", 652 __func__); 653 return -5; 654 } 655 656 if (left >= 2) { 657 data->key_mgmt = 0; 658 count = WPA_GET_LE16(pos); 659 pos += 2; 660 left -= 2; 661 if (count == 0 || left < count * WPA_SELECTOR_LEN) { 662 wpa_printf(MSG_DEBUG, "%s: ie count botch (key mgmt), " 663 "count %u left %u", __func__, count, left); 664 return -6; 665 } 666 for (i = 0; i < count; i++) { 667 data->key_mgmt |= wpa_key_mgmt_to_bitfield(pos); 668 pos += WPA_SELECTOR_LEN; 669 left -= WPA_SELECTOR_LEN; 670 } 671 } else if (left == 1) { 672 wpa_printf(MSG_DEBUG, "%s: ie too short (for capabilities)", 673 __func__); 674 return -7; 675 } 676 677 if (left >= 2) { 678 data->capabilities = WPA_GET_LE16(pos); 679 pos += 2; 680 left -= 2; 681 } 682 683 if (left > 0) { 684 wpa_printf(MSG_DEBUG, "%s: ie has %u trailing bytes - ignored", 685 __func__, left); 686 } 687 688 return 0; 689} 690 691 692#ifdef CONFIG_IEEE80211R 693 694/** 695 * wpa_derive_pmk_r0 - Derive PMK-R0 and PMKR0Name 696 * 697 * IEEE Std 802.11r-2008 - 8.5.1.5.3 698 */ 699void wpa_derive_pmk_r0(const u8 *xxkey, size_t xxkey_len, 700 const u8 *ssid, size_t ssid_len, 701 const u8 *mdid, const u8 *r0kh_id, size_t r0kh_id_len, 702 const u8 *s0kh_id, u8 *pmk_r0, u8 *pmk_r0_name) 703{ 704 u8 buf[1 + WPA_MAX_SSID_LEN + MOBILITY_DOMAIN_ID_LEN + 1 + 705 FT_R0KH_ID_MAX_LEN + ETH_ALEN]; 706 u8 *pos, r0_key_data[48], hash[32]; 707 const u8 *addr[2]; 708 size_t len[2]; 709 710 /* 711 * R0-Key-Data = KDF-384(XXKey, "FT-R0", 712 * SSIDlength || SSID || MDID || R0KHlength || 713 * R0KH-ID || S0KH-ID) 714 * XXKey is either the second 256 bits of MSK or PSK. 715 * PMK-R0 = L(R0-Key-Data, 0, 256) 716 * PMK-R0Name-Salt = L(R0-Key-Data, 256, 128) 717 */ 718 if (ssid_len > WPA_MAX_SSID_LEN || r0kh_id_len > FT_R0KH_ID_MAX_LEN) 719 return; 720 pos = buf; 721 *pos++ = ssid_len; 722 os_memcpy(pos, ssid, ssid_len); 723 pos += ssid_len; 724 os_memcpy(pos, mdid, MOBILITY_DOMAIN_ID_LEN); 725 pos += MOBILITY_DOMAIN_ID_LEN; 726 *pos++ = r0kh_id_len; 727 os_memcpy(pos, r0kh_id, r0kh_id_len); 728 pos += r0kh_id_len; 729 os_memcpy(pos, s0kh_id, ETH_ALEN); 730 pos += ETH_ALEN; 731 732 sha256_prf(xxkey, xxkey_len, "FT-R0", buf, pos - buf, 733 r0_key_data, sizeof(r0_key_data)); 734 os_memcpy(pmk_r0, r0_key_data, PMK_LEN); 735 736 /* 737 * PMKR0Name = Truncate-128(SHA-256("FT-R0N" || PMK-R0Name-Salt) 738 */ 739 addr[0] = (const u8 *) "FT-R0N"; 740 len[0] = 6; 741 addr[1] = r0_key_data + PMK_LEN; 742 len[1] = 16; 743 744 sha256_vector(2, addr, len, hash); 745 os_memcpy(pmk_r0_name, hash, WPA_PMK_NAME_LEN); 746} 747 748 749/** 750 * wpa_derive_pmk_r1_name - Derive PMKR1Name 751 * 752 * IEEE Std 802.11r-2008 - 8.5.1.5.4 753 */ 754void wpa_derive_pmk_r1_name(const u8 *pmk_r0_name, const u8 *r1kh_id, 755 const u8 *s1kh_id, u8 *pmk_r1_name) 756{ 757 u8 hash[32]; 758 const u8 *addr[4]; 759 size_t len[4]; 760 761 /* 762 * PMKR1Name = Truncate-128(SHA-256("FT-R1N" || PMKR0Name || 763 * R1KH-ID || S1KH-ID)) 764 */ 765 addr[0] = (const u8 *) "FT-R1N"; 766 len[0] = 6; 767 addr[1] = pmk_r0_name; 768 len[1] = WPA_PMK_NAME_LEN; 769 addr[2] = r1kh_id; 770 len[2] = FT_R1KH_ID_LEN; 771 addr[3] = s1kh_id; 772 len[3] = ETH_ALEN; 773 774 sha256_vector(4, addr, len, hash); 775 os_memcpy(pmk_r1_name, hash, WPA_PMK_NAME_LEN); 776} 777 778 779/** 780 * wpa_derive_pmk_r1 - Derive PMK-R1 and PMKR1Name from PMK-R0 781 * 782 * IEEE Std 802.11r-2008 - 8.5.1.5.4 783 */ 784void wpa_derive_pmk_r1(const u8 *pmk_r0, const u8 *pmk_r0_name, 785 const u8 *r1kh_id, const u8 *s1kh_id, 786 u8 *pmk_r1, u8 *pmk_r1_name) 787{ 788 u8 buf[FT_R1KH_ID_LEN + ETH_ALEN]; 789 u8 *pos; 790 791 /* PMK-R1 = KDF-256(PMK-R0, "FT-R1", R1KH-ID || S1KH-ID) */ 792 pos = buf; 793 os_memcpy(pos, r1kh_id, FT_R1KH_ID_LEN); 794 pos += FT_R1KH_ID_LEN; 795 os_memcpy(pos, s1kh_id, ETH_ALEN); 796 pos += ETH_ALEN; 797 798 sha256_prf(pmk_r0, PMK_LEN, "FT-R1", buf, pos - buf, pmk_r1, PMK_LEN); 799 800 wpa_derive_pmk_r1_name(pmk_r0_name, r1kh_id, s1kh_id, pmk_r1_name); 801} 802 803 804/** 805 * wpa_pmk_r1_to_ptk - Derive PTK and PTKName from PMK-R1 806 * 807 * IEEE Std 802.11r-2008 - 8.5.1.5.5 808 */ 809void wpa_pmk_r1_to_ptk(const u8 *pmk_r1, const u8 *snonce, const u8 *anonce, 810 const u8 *sta_addr, const u8 *bssid, 811 const u8 *pmk_r1_name, 812 u8 *ptk, size_t ptk_len, u8 *ptk_name) 813{ 814 u8 buf[2 * WPA_NONCE_LEN + 2 * ETH_ALEN]; 815 u8 *pos, hash[32]; 816 const u8 *addr[6]; 817 size_t len[6]; 818 819 /* 820 * PTK = KDF-PTKLen(PMK-R1, "FT-PTK", SNonce || ANonce || 821 * BSSID || STA-ADDR) 822 */ 823 pos = buf; 824 os_memcpy(pos, snonce, WPA_NONCE_LEN); 825 pos += WPA_NONCE_LEN; 826 os_memcpy(pos, anonce, WPA_NONCE_LEN); 827 pos += WPA_NONCE_LEN; 828 os_memcpy(pos, bssid, ETH_ALEN); 829 pos += ETH_ALEN; 830 os_memcpy(pos, sta_addr, ETH_ALEN); 831 pos += ETH_ALEN; 832 833 sha256_prf(pmk_r1, PMK_LEN, "FT-PTK", buf, pos - buf, ptk, ptk_len); 834 835 /* 836 * PTKName = Truncate-128(SHA-256(PMKR1Name || "FT-PTKN" || SNonce || 837 * ANonce || BSSID || STA-ADDR)) 838 */ 839 addr[0] = pmk_r1_name; 840 len[0] = WPA_PMK_NAME_LEN; 841 addr[1] = (const u8 *) "FT-PTKN"; 842 len[1] = 7; 843 addr[2] = snonce; 844 len[2] = WPA_NONCE_LEN; 845 addr[3] = anonce; 846 len[3] = WPA_NONCE_LEN; 847 addr[4] = bssid; 848 len[4] = ETH_ALEN; 849 addr[5] = sta_addr; 850 len[5] = ETH_ALEN; 851 852 sha256_vector(6, addr, len, hash); 853 os_memcpy(ptk_name, hash, WPA_PMK_NAME_LEN); 854} 855 856#endif /* CONFIG_IEEE80211R */ 857 858 859/** 860 * rsn_pmkid - Calculate PMK identifier 861 * @pmk: Pairwise master key 862 * @pmk_len: Length of pmk in bytes 863 * @aa: Authenticator address 864 * @spa: Supplicant address 865 * @pmkid: Buffer for PMKID 866 * @use_sha256: Whether to use SHA256-based KDF 867 * 868 * IEEE Std 802.11i-2004 - 8.5.1.2 Pairwise key hierarchy 869 * PMKID = HMAC-SHA1-128(PMK, "PMK Name" || AA || SPA) 870 */ 871void rsn_pmkid(const u8 *pmk, size_t pmk_len, const u8 *aa, const u8 *spa, 872 u8 *pmkid, int use_sha256) 873{ 874 char *title = "PMK Name"; 875 const u8 *addr[3]; 876 const size_t len[3] = { 8, ETH_ALEN, ETH_ALEN }; 877 unsigned char hash[SHA256_MAC_LEN]; 878 879 addr[0] = (u8 *) title; 880 addr[1] = aa; 881 addr[2] = spa; 882 883#ifdef CONFIG_IEEE80211W 884 if (use_sha256) 885 hmac_sha256_vector(pmk, pmk_len, 3, addr, len, hash); 886 else 887#endif /* CONFIG_IEEE80211W */ 888 hmac_sha1_vector(pmk, pmk_len, 3, addr, len, hash); 889 os_memcpy(pmkid, hash, PMKID_LEN); 890} 891 892 893/** 894 * wpa_cipher_txt - Convert cipher suite to a text string 895 * @cipher: Cipher suite (WPA_CIPHER_* enum) 896 * Returns: Pointer to a text string of the cipher suite name 897 */ 898const char * wpa_cipher_txt(int cipher) 899{ 900 switch (cipher) { 901 case WPA_CIPHER_NONE: 902 return "NONE"; 903 case WPA_CIPHER_WEP40: 904 return "WEP-40"; 905 case WPA_CIPHER_WEP104: 906 return "WEP-104"; 907 case WPA_CIPHER_TKIP: 908 return "TKIP"; 909 case WPA_CIPHER_CCMP: 910 return "CCMP"; 911 case WPA_CIPHER_CCMP | WPA_CIPHER_TKIP: 912 return "CCMP+TKIP"; 913 case WPA_CIPHER_GCMP: 914 return "GCMP"; 915 default: 916 return "UNKNOWN"; 917 } 918} 919 920 921/** 922 * wpa_key_mgmt_txt - Convert key management suite to a text string 923 * @key_mgmt: Key management suite (WPA_KEY_MGMT_* enum) 924 * @proto: WPA/WPA2 version (WPA_PROTO_*) 925 * Returns: Pointer to a text string of the key management suite name 926 */ 927const char * wpa_key_mgmt_txt(int key_mgmt, int proto) 928{ 929 switch (key_mgmt) { 930 case WPA_KEY_MGMT_IEEE8021X: 931 if (proto == (WPA_PROTO_RSN | WPA_PROTO_WPA)) 932 return "WPA2+WPA/IEEE 802.1X/EAP"; 933 return proto == WPA_PROTO_RSN ? 934 "WPA2/IEEE 802.1X/EAP" : "WPA/IEEE 802.1X/EAP"; 935 case WPA_KEY_MGMT_PSK: 936 if (proto == (WPA_PROTO_RSN | WPA_PROTO_WPA)) 937 return "WPA2-PSK+WPA-PSK"; 938 return proto == WPA_PROTO_RSN ? 939 "WPA2-PSK" : "WPA-PSK"; 940 case WPA_KEY_MGMT_NONE: 941 return "NONE"; 942 case WPA_KEY_MGMT_IEEE8021X_NO_WPA: 943 return "IEEE 802.1X (no WPA)"; 944#ifdef CONFIG_IEEE80211R 945 case WPA_KEY_MGMT_FT_IEEE8021X: 946 return "FT-EAP"; 947 case WPA_KEY_MGMT_FT_PSK: 948 return "FT-PSK"; 949#endif /* CONFIG_IEEE80211R */ 950#ifdef CONFIG_IEEE80211W 951 case WPA_KEY_MGMT_IEEE8021X_SHA256: 952 return "WPA2-EAP-SHA256"; 953 case WPA_KEY_MGMT_PSK_SHA256: 954 return "WPA2-PSK-SHA256"; 955#endif /* CONFIG_IEEE80211W */ 956 default: 957 return "UNKNOWN"; 958 } 959} 960 961 962int wpa_compare_rsn_ie(int ft_initial_assoc, 963 const u8 *ie1, size_t ie1len, 964 const u8 *ie2, size_t ie2len) 965{ 966 if (ie1 == NULL || ie2 == NULL) 967 return -1; 968 969 if (ie1len == ie2len && os_memcmp(ie1, ie2, ie1len) == 0) 970 return 0; /* identical IEs */ 971 972#ifdef CONFIG_IEEE80211R 973 if (ft_initial_assoc) { 974 struct wpa_ie_data ie1d, ie2d; 975 /* 976 * The PMKID-List in RSN IE is different between Beacon/Probe 977 * Response/(Re)Association Request frames and EAPOL-Key 978 * messages in FT initial mobility domain association. Allow 979 * for this, but verify that other parts of the RSN IEs are 980 * identical. 981 */ 982 if (wpa_parse_wpa_ie_rsn(ie1, ie1len, &ie1d) < 0 || 983 wpa_parse_wpa_ie_rsn(ie2, ie2len, &ie2d) < 0) 984 return -1; 985 if (ie1d.proto == ie2d.proto && 986 ie1d.pairwise_cipher == ie2d.pairwise_cipher && 987 ie1d.group_cipher == ie2d.group_cipher && 988 ie1d.key_mgmt == ie2d.key_mgmt && 989 ie1d.capabilities == ie2d.capabilities && 990 ie1d.mgmt_group_cipher == ie2d.mgmt_group_cipher) 991 return 0; 992 } 993#endif /* CONFIG_IEEE80211R */ 994 995 return -1; 996} 997 998 999#ifdef CONFIG_IEEE80211R 1000int wpa_insert_pmkid(u8 *ies, size_t ies_len, const u8 *pmkid) 1001{ 1002 u8 *start, *end, *rpos, *rend; 1003 int added = 0; 1004 1005 start = ies; 1006 end = ies + ies_len; 1007 1008 while (start < end) { 1009 if (*start == WLAN_EID_RSN) 1010 break; 1011 start += 2 + start[1]; 1012 } 1013 if (start >= end) { 1014 wpa_printf(MSG_ERROR, "FT: Could not find RSN IE in " 1015 "IEs data"); 1016 return -1; 1017 } 1018 wpa_hexdump(MSG_DEBUG, "FT: RSN IE before modification", 1019 start, 2 + start[1]); 1020 1021 /* Find start of PMKID-Count */ 1022 rpos = start + 2; 1023 rend = rpos + start[1]; 1024 1025 /* Skip Version and Group Data Cipher Suite */ 1026 rpos += 2 + 4; 1027 /* Skip Pairwise Cipher Suite Count and List */ 1028 rpos += 2 + WPA_GET_LE16(rpos) * RSN_SELECTOR_LEN; 1029 /* Skip AKM Suite Count and List */ 1030 rpos += 2 + WPA_GET_LE16(rpos) * RSN_SELECTOR_LEN; 1031 1032 if (rpos == rend) { 1033 /* Add RSN Capabilities */ 1034 os_memmove(rpos + 2, rpos, end - rpos); 1035 *rpos++ = 0; 1036 *rpos++ = 0; 1037 } else { 1038 /* Skip RSN Capabilities */ 1039 rpos += 2; 1040 if (rpos > rend) { 1041 wpa_printf(MSG_ERROR, "FT: Could not parse RSN IE in " 1042 "IEs data"); 1043 return -1; 1044 } 1045 } 1046 1047 if (rpos == rend) { 1048 /* No PMKID-Count field included; add it */ 1049 os_memmove(rpos + 2 + PMKID_LEN, rpos, end - rpos); 1050 WPA_PUT_LE16(rpos, 1); 1051 rpos += 2; 1052 os_memcpy(rpos, pmkid, PMKID_LEN); 1053 added += 2 + PMKID_LEN; 1054 start[1] += 2 + PMKID_LEN; 1055 } else { 1056 /* PMKID-Count was included; use it */ 1057 if (WPA_GET_LE16(rpos) != 0) { 1058 wpa_printf(MSG_ERROR, "FT: Unexpected PMKID " 1059 "in RSN IE in EAPOL-Key data"); 1060 return -1; 1061 } 1062 WPA_PUT_LE16(rpos, 1); 1063 rpos += 2; 1064 os_memmove(rpos + PMKID_LEN, rpos, end - rpos); 1065 os_memcpy(rpos, pmkid, PMKID_LEN); 1066 added += PMKID_LEN; 1067 start[1] += PMKID_LEN; 1068 } 1069 1070 wpa_hexdump(MSG_DEBUG, "FT: RSN IE after modification " 1071 "(PMKID inserted)", start, 2 + start[1]); 1072 1073 return added; 1074} 1075#endif /* CONFIG_IEEE80211R */ 1076 1077 1078int wpa_cipher_key_len(int cipher) 1079{ 1080 switch (cipher) { 1081 case WPA_CIPHER_CCMP: 1082 case WPA_CIPHER_GCMP: 1083 return 16; 1084 case WPA_CIPHER_TKIP: 1085 return 32; 1086 case WPA_CIPHER_WEP104: 1087 return 13; 1088 case WPA_CIPHER_WEP40: 1089 return 5; 1090 } 1091 1092 return 0; 1093} 1094 1095 1096int wpa_cipher_rsc_len(int cipher) 1097{ 1098 switch (cipher) { 1099 case WPA_CIPHER_CCMP: 1100 case WPA_CIPHER_GCMP: 1101 case WPA_CIPHER_TKIP: 1102 return 6; 1103 case WPA_CIPHER_WEP104: 1104 case WPA_CIPHER_WEP40: 1105 return 0; 1106 } 1107 1108 return 0; 1109} 1110 1111 1112int wpa_cipher_to_alg(int cipher) 1113{ 1114 switch (cipher) { 1115 case WPA_CIPHER_CCMP: 1116 return WPA_ALG_CCMP; 1117 case WPA_CIPHER_GCMP: 1118 return WPA_ALG_GCMP; 1119 case WPA_CIPHER_TKIP: 1120 return WPA_ALG_TKIP; 1121 case WPA_CIPHER_WEP104: 1122 case WPA_CIPHER_WEP40: 1123 return WPA_ALG_WEP; 1124 } 1125 return WPA_ALG_NONE; 1126} 1127 1128 1129enum wpa_cipher wpa_cipher_to_suite_driver(int cipher) 1130{ 1131 switch (cipher) { 1132 case WPA_CIPHER_NONE: 1133 return CIPHER_NONE; 1134 case WPA_CIPHER_WEP40: 1135 return CIPHER_WEP40; 1136 case WPA_CIPHER_WEP104: 1137 return CIPHER_WEP104; 1138 case WPA_CIPHER_CCMP: 1139 return CIPHER_CCMP; 1140 case WPA_CIPHER_GCMP: 1141 return CIPHER_GCMP; 1142 case WPA_CIPHER_TKIP: 1143 default: 1144 return CIPHER_TKIP; 1145 } 1146} 1147 1148 1149int wpa_cipher_valid_pairwise(int cipher) 1150{ 1151 return cipher == WPA_CIPHER_CCMP || 1152 cipher == WPA_CIPHER_GCMP || 1153 cipher == WPA_CIPHER_TKIP; 1154} 1155 1156 1157u32 wpa_cipher_to_suite(int proto, int cipher) 1158{ 1159 if (cipher & WPA_CIPHER_CCMP) 1160 return (proto == WPA_PROTO_RSN ? 1161 RSN_CIPHER_SUITE_CCMP : WPA_CIPHER_SUITE_CCMP); 1162 if (cipher & WPA_CIPHER_GCMP) 1163 return RSN_CIPHER_SUITE_GCMP; 1164 if (cipher & WPA_CIPHER_TKIP) 1165 return (proto == WPA_PROTO_RSN ? 1166 RSN_CIPHER_SUITE_TKIP : WPA_CIPHER_SUITE_TKIP); 1167 if (cipher & WPA_CIPHER_WEP104) 1168 return (proto == WPA_PROTO_RSN ? 1169 RSN_CIPHER_SUITE_WEP104 : WPA_CIPHER_SUITE_WEP104); 1170 if (cipher & WPA_CIPHER_WEP40) 1171 return (proto == WPA_PROTO_RSN ? 1172 RSN_CIPHER_SUITE_WEP40 : WPA_CIPHER_SUITE_WEP40); 1173 if (cipher & WPA_CIPHER_NONE) 1174 return (proto == WPA_PROTO_RSN ? 1175 RSN_CIPHER_SUITE_NONE : WPA_CIPHER_SUITE_NONE); 1176 return 0; 1177} 1178 1179 1180int rsn_cipher_put_suites(u8 *pos, int ciphers) 1181{ 1182 int num_suites = 0; 1183 1184 if (ciphers & WPA_CIPHER_CCMP) { 1185 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP); 1186 pos += RSN_SELECTOR_LEN; 1187 num_suites++; 1188 } 1189 if (ciphers & WPA_CIPHER_GCMP) { 1190 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_GCMP); 1191 pos += RSN_SELECTOR_LEN; 1192 num_suites++; 1193 } 1194 if (ciphers & WPA_CIPHER_TKIP) { 1195 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP); 1196 pos += RSN_SELECTOR_LEN; 1197 num_suites++; 1198 } 1199 if (ciphers & WPA_CIPHER_NONE) { 1200 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NONE); 1201 pos += RSN_SELECTOR_LEN; 1202 num_suites++; 1203 } 1204 1205 return num_suites; 1206} 1207 1208 1209int wpa_cipher_put_suites(u8 *pos, int ciphers) 1210{ 1211 int num_suites = 0; 1212 1213 if (ciphers & WPA_CIPHER_CCMP) { 1214 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_CCMP); 1215 pos += WPA_SELECTOR_LEN; 1216 num_suites++; 1217 } 1218 if (ciphers & WPA_CIPHER_TKIP) { 1219 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_TKIP); 1220 pos += WPA_SELECTOR_LEN; 1221 num_suites++; 1222 } 1223 if (ciphers & WPA_CIPHER_NONE) { 1224 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_NONE); 1225 pos += WPA_SELECTOR_LEN; 1226 num_suites++; 1227 } 1228 1229 return num_suites; 1230} 1231 1232 1233int wpa_pick_pairwise_cipher(int ciphers, int none_allowed) 1234{ 1235 if (ciphers & WPA_CIPHER_CCMP) 1236 return WPA_CIPHER_CCMP; 1237 if (ciphers & WPA_CIPHER_GCMP) 1238 return WPA_CIPHER_GCMP; 1239 if (ciphers & WPA_CIPHER_TKIP) 1240 return WPA_CIPHER_TKIP; 1241 if (none_allowed && (ciphers & WPA_CIPHER_NONE)) 1242 return WPA_CIPHER_NONE; 1243 return -1; 1244} 1245 1246 1247int wpa_pick_group_cipher(int ciphers) 1248{ 1249 if (ciphers & WPA_CIPHER_CCMP) 1250 return WPA_CIPHER_CCMP; 1251 if (ciphers & WPA_CIPHER_GCMP) 1252 return WPA_CIPHER_GCMP; 1253 if (ciphers & WPA_CIPHER_TKIP) 1254 return WPA_CIPHER_TKIP; 1255 if (ciphers & WPA_CIPHER_WEP104) 1256 return WPA_CIPHER_WEP104; 1257 if (ciphers & WPA_CIPHER_WEP40) 1258 return WPA_CIPHER_WEP40; 1259 return -1; 1260} 1261 1262 1263int wpa_parse_cipher(const char *value) 1264{ 1265 int val = 0, last; 1266 char *start, *end, *buf; 1267 1268 buf = os_strdup(value); 1269 if (buf == NULL) 1270 return -1; 1271 start = buf; 1272 1273 while (*start != '\0') { 1274 while (*start == ' ' || *start == '\t') 1275 start++; 1276 if (*start == '\0') 1277 break; 1278 end = start; 1279 while (*end != ' ' && *end != '\t' && *end != '\0') 1280 end++; 1281 last = *end == '\0'; 1282 *end = '\0'; 1283 if (os_strcmp(start, "CCMP") == 0) 1284 val |= WPA_CIPHER_CCMP; 1285 else if (os_strcmp(start, "GCMP") == 0) 1286 val |= WPA_CIPHER_GCMP; 1287 else if (os_strcmp(start, "TKIP") == 0) 1288 val |= WPA_CIPHER_TKIP; 1289 else if (os_strcmp(start, "WEP104") == 0) 1290 val |= WPA_CIPHER_WEP104; 1291 else if (os_strcmp(start, "WEP40") == 0) 1292 val |= WPA_CIPHER_WEP40; 1293 else if (os_strcmp(start, "NONE") == 0) 1294 val |= WPA_CIPHER_NONE; 1295 else { 1296 os_free(buf); 1297 return -1; 1298 } 1299 1300 if (last) 1301 break; 1302 start = end + 1; 1303 } 1304 os_free(buf); 1305 1306 return val; 1307} 1308 1309 1310int wpa_write_ciphers(char *start, char *end, int ciphers, const char *delim) 1311{ 1312 char *pos = start; 1313 int ret; 1314 1315 if (ciphers & WPA_CIPHER_CCMP) { 1316 ret = os_snprintf(pos, end - pos, "%sCCMP", 1317 pos == start ? "" : delim); 1318 if (ret < 0 || ret >= end - pos) 1319 return -1; 1320 pos += ret; 1321 } 1322 if (ciphers & WPA_CIPHER_GCMP) { 1323 ret = os_snprintf(pos, end - pos, "%sGCMP", 1324 pos == start ? "" : delim); 1325 if (ret < 0 || ret >= end - pos) 1326 return -1; 1327 pos += ret; 1328 } 1329 if (ciphers & WPA_CIPHER_TKIP) { 1330 ret = os_snprintf(pos, end - pos, "%sTKIP", 1331 pos == start ? "" : delim); 1332 if (ret < 0 || ret >= end - pos) 1333 return -1; 1334 pos += ret; 1335 } 1336 if (ciphers & WPA_CIPHER_WEP104) { 1337 ret = os_snprintf(pos, end - pos, "%sWEP104", 1338 pos == start ? "" : delim); 1339 if (ret < 0 || ret >= end - pos) 1340 return -1; 1341 pos += ret; 1342 } 1343 if (ciphers & WPA_CIPHER_WEP40) { 1344 ret = os_snprintf(pos, end - pos, "%sWEP40", 1345 pos == start ? "" : delim); 1346 if (ret < 0 || ret >= end - pos) 1347 return -1; 1348 pos += ret; 1349 } 1350 if (ciphers & WPA_CIPHER_NONE) { 1351 ret = os_snprintf(pos, end - pos, "%sNONE", 1352 pos == start ? "" : delim); 1353 if (ret < 0 || ret >= end - pos) 1354 return -1; 1355 pos += ret; 1356 } 1357 1358 return pos - start; 1359} 1360 1361 1362int wpa_select_ap_group_cipher(int wpa, int wpa_pairwise, int rsn_pairwise) 1363{ 1364 int pairwise = 0; 1365 1366 /* Select group cipher based on the enabled pairwise cipher suites */ 1367 if (wpa & 1) 1368 pairwise |= wpa_pairwise; 1369 if (wpa & 2) 1370 pairwise |= rsn_pairwise; 1371 1372 if (pairwise & WPA_CIPHER_TKIP) 1373 return WPA_CIPHER_TKIP; 1374 if ((pairwise & (WPA_CIPHER_CCMP | WPA_CIPHER_GCMP)) == WPA_CIPHER_GCMP) 1375 return WPA_CIPHER_GCMP; 1376 return WPA_CIPHER_CCMP; 1377} 1378