contrib/wpa/src/rsn_supp/wpa_ft.c

   1 /*
   2  * WPA Supplicant - IEEE 802.11r - Fast BSS Transition
   3  * Copyright (c) 2006-2007, 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/aes_wrap.h"
  13 #include "crypto/random.h"
  14 #include "common/ieee802_11_defs.h"
  15 #include "common/ieee802_11_common.h"
  16 #include "wpa.h"
  17 #include "wpa_i.h"
  18
  19 #ifdef CONFIG_IEEE80211R
  20
  21 int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr,
  22                       const struct wpa_eapol_key *key,
  23                       struct wpa_ptk *ptk, size_t ptk_len)
  24 {
  25         u8 ptk_name[WPA_PMK_NAME_LEN];
  26         const u8 *anonce = key->key_nonce;
  27
  28         if (sm->xxkey_len == 0) {
  29                 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
  30                            "derivation");
  31                 return -1;
  32         }
  33
  34         wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid,
  35                           sm->ssid_len, sm->mobility_domain,
  36                           sm->r0kh_id, sm->r0kh_id_len, sm->own_addr,
  37                           sm->pmk_r0, sm->pmk_r0_name);
  38         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, PMK_LEN);
  39         wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name",
  40                     sm->pmk_r0_name, WPA_PMK_NAME_LEN);
  41         wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
  42                           sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
  43         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
  44         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
  45                     WPA_PMK_NAME_LEN);
  46         wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr,
  47                           sm->bssid, sm->pmk_r1_name,
  48                           (u8 *) ptk, ptk_len, ptk_name);
  49         wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len);
  50         wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
  51
  52         return 0;
  53 }
  54
  55
  56 /**
  57  * wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters
  58  * @sm: Pointer to WPA state machine data from wpa_sm_init()
  59  * @ies: Association Response IEs or %NULL to clear FT parameters
  60  * @ies_len: Length of ies buffer in octets
  61  * Returns: 0 on success, -1 on failure
  62  */
  63 int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *ies, size_t ies_len)
  64 {
  65         struct wpa_ft_ies ft;
  66
  67         if (sm == NULL)
  68                 return 0;
  69
  70         if (wpa_ft_parse_ies(ies, ies_len, &ft) < 0)
  71                 return -1;
  72
  73         if (ft.mdie && ft.mdie_len < MOBILITY_DOMAIN_ID_LEN + 1)
  74                 return -1;
  75
  76         if (ft.mdie) {
  77                 wpa_hexdump(MSG_DEBUG, "FT: Mobility domain",
  78                             ft.mdie, MOBILITY_DOMAIN_ID_LEN);
  79                 os_memcpy(sm->mobility_domain, ft.mdie,
  80                           MOBILITY_DOMAIN_ID_LEN);
  81                 sm->mdie_ft_capab = ft.mdie[MOBILITY_DOMAIN_ID_LEN];
  82                 wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x",
  83                            sm->mdie_ft_capab);
  84         } else
  85                 os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);
  86
  87         if (ft.r0kh_id) {
  88                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID",
  89                             ft.r0kh_id, ft.r0kh_id_len);
  90                 os_memcpy(sm->r0kh_id, ft.r0kh_id, ft.r0kh_id_len);
  91                 sm->r0kh_id_len = ft.r0kh_id_len;
  92         } else {
  93                 /* FIX: When should R0KH-ID be cleared? We need to keep the
  94                  * old R0KH-ID in order to be able to use this during FT. */
  95                 /*
  96                  * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN);
  97                  * sm->r0kh_id_len = 0;
  98                  */
  99         }
 100
 101         if (ft.r1kh_id) {
 102                 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID",
 103                             ft.r1kh_id, FT_R1KH_ID_LEN);
 104                 os_memcpy(sm->r1kh_id, ft.r1kh_id, FT_R1KH_ID_LEN);
 105         } else
 106                 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
 107
 108         os_free(sm->assoc_resp_ies);
 109         sm->assoc_resp_ies = os_malloc(ft.mdie_len + 2 + ft.ftie_len + 2);
 110         if (sm->assoc_resp_ies) {
 111                 u8 *pos = sm->assoc_resp_ies;
 112                 if (ft.mdie) {
 113                         os_memcpy(pos, ft.mdie - 2, ft.mdie_len + 2);
 114                         pos += ft.mdie_len + 2;
 115                 }
 116                 if (ft.ftie) {
 117                         os_memcpy(pos, ft.ftie - 2, ft.ftie_len + 2);
 118                         pos += ft.ftie_len + 2;
 119                 }
 120                 sm->assoc_resp_ies_len = pos - sm->assoc_resp_ies;
 121                 wpa_hexdump(MSG_DEBUG, "FT: Stored MDIE and FTIE from "
 122                             "(Re)Association Response",
 123                             sm->assoc_resp_ies, sm->assoc_resp_ies_len);
 124         }
 125
 126         return 0;
 127 }
 128
 129
 130 /**
 131  * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request
 132  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 133  * @len: Buffer for returning the length of the IEs
 134  * @anonce: ANonce or %NULL if not yet available
 135  * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List
 136  * @kck: 128-bit KCK for MIC or %NULL if no MIC is used
 137  * @target_ap: Target AP address
 138  * @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL
 139  * @ric_ies_len: Length of ric_ies buffer in octets
 140  * @ap_mdie: Mobility Domain IE from the target AP
 141  * Returns: Pointer to buffer with IEs or %NULL on failure
 142  *
 143  * Caller is responsible for freeing the returned buffer with os_free();
 144  */
 145 static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
 146                                const u8 *anonce, const u8 *pmk_name,
 147                                const u8 *kck, const u8 *target_ap,
 148                                const u8 *ric_ies, size_t ric_ies_len,
 149                                const u8 *ap_mdie)
 150 {
 151         size_t buf_len;
 152         u8 *buf, *pos, *ftie_len, *ftie_pos;
 153         struct rsn_mdie *mdie;
 154         struct rsn_ftie *ftie;
 155         struct rsn_ie_hdr *rsnie;
 156         u16 capab;
 157
 158         sm->ft_completed = 0;
 159
 160         buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
 161                 2 + sm->r0kh_id_len + ric_ies_len + 100;
 162         buf = os_zalloc(buf_len);
 163         if (buf == NULL)
 164                 return NULL;
 165         pos = buf;
 166
 167         /* RSNIE[PMKR0Name/PMKR1Name] */
 168         rsnie = (struct rsn_ie_hdr *) pos;
 169         rsnie->elem_id = WLAN_EID_RSN;
 170         WPA_PUT_LE16(rsnie->version, RSN_VERSION);
 171         pos = (u8 *) (rsnie + 1);
 172
 173         /* Group Suite Selector */
 174         if (sm->group_cipher != WPA_CIPHER_CCMP &&
 175             sm->group_cipher != WPA_CIPHER_GCMP &&
 176             sm->group_cipher != WPA_CIPHER_TKIP) {
 177                 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
 178                            sm->group_cipher);
 179                 os_free(buf);
 180                 return NULL;
 181         }
 182         RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
 183                                                   sm->group_cipher));
 184         pos += RSN_SELECTOR_LEN;
 185
 186         /* Pairwise Suite Count */
 187         WPA_PUT_LE16(pos, 1);
 188         pos += 2;
 189
 190         /* Pairwise Suite List */
 191         if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
 192                 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
 193                            sm->pairwise_cipher);
 194                 os_free(buf);
 195                 return NULL;
 196         }
 197         RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
 198                                                   sm->pairwise_cipher));
 199         pos += RSN_SELECTOR_LEN;
 200
 201         /* Authenticated Key Management Suite Count */
 202         WPA_PUT_LE16(pos, 1);
 203         pos += 2;
 204
 205         /* Authenticated Key Management Suite List */
 206         if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
 207                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
 208         else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
 209                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
 210         else {
 211                 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
 212                            sm->key_mgmt);
 213                 os_free(buf);
 214                 return NULL;
 215         }
 216         pos += RSN_SELECTOR_LEN;
 217
 218         /* RSN Capabilities */
 219         capab = 0;
 220 #ifdef CONFIG_IEEE80211W
 221         if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
 222                 capab |= WPA_CAPABILITY_MFPC;
 223 #endif /* CONFIG_IEEE80211W */
 224         WPA_PUT_LE16(pos, capab);
 225         pos += 2;
 226
 227         /* PMKID Count */
 228         WPA_PUT_LE16(pos, 1);
 229         pos += 2;
 230
 231         /* PMKID List [PMKR0Name/PMKR1Name] */
 232         os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
 233         pos += WPA_PMK_NAME_LEN;
 234
 235 #ifdef CONFIG_IEEE80211W
 236         if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
 237                 /* Management Group Cipher Suite */
 238                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
 239                 pos += RSN_SELECTOR_LEN;
 240         }
 241 #endif /* CONFIG_IEEE80211W */
 242
 243         rsnie->len = (pos - (u8 *) rsnie) - 2;
 244
 245         /* MDIE */
 246         *pos++ = WLAN_EID_MOBILITY_DOMAIN;
 247         *pos++ = sizeof(*mdie);
 248         mdie = (struct rsn_mdie *) pos;
 249         pos += sizeof(*mdie);
 250         os_memcpy(mdie->mobility_domain, sm->mobility_domain,
 251                   MOBILITY_DOMAIN_ID_LEN);
 252         mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
 253                 sm->mdie_ft_capab;
 254
 255         /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
 256         ftie_pos = pos;
 257         *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
 258         ftie_len = pos++;
 259         ftie = (struct rsn_ftie *) pos;
 260         pos += sizeof(*ftie);
 261         os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
 262         if (anonce)
 263                 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
 264         if (kck) {
 265                 /* R1KH-ID sub-element in third FT message */
 266                 *pos++ = FTIE_SUBELEM_R1KH_ID;
 267                 *pos++ = FT_R1KH_ID_LEN;
 268                 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
 269                 pos += FT_R1KH_ID_LEN;
 270         }
 271         /* R0KH-ID sub-element */
 272         *pos++ = FTIE_SUBELEM_R0KH_ID;
 273         *pos++ = sm->r0kh_id_len;
 274         os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
 275         pos += sm->r0kh_id_len;
 276         *ftie_len = pos - ftie_len - 1;
 277
 278         if (ric_ies) {
 279                 /* RIC Request */
 280                 os_memcpy(pos, ric_ies, ric_ies_len);
 281                 pos += ric_ies_len;
 282         }
 283
 284         if (kck) {
 285                 /*
 286                  * IEEE Std 802.11r-2008, 11A.8.4
 287                  * MIC shall be calculated over:
 288                  * non-AP STA MAC address
 289                  * Target AP MAC address
 290                  * Transaction seq number (5 for ReassocReq, 3 otherwise)
 291                  * RSN IE
 292                  * MDIE
 293                  * FTIE (with MIC field set to 0)
 294                  * RIC-Request (if present)
 295                  */
 296                 /* Information element count */
 297                 ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies,
 298                                                                ric_ies_len);
 299                 if (wpa_ft_mic(kck, sm->own_addr, target_ap, 5,
 300                                ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
 301                                ftie_pos, 2 + *ftie_len,
 302                                (u8 *) rsnie, 2 + rsnie->len, ric_ies,
 303                                ric_ies_len, ftie->mic) < 0) {
 304                         wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
 305                         os_free(buf);
 306                         return NULL;
 307                 }
 308         }
 309
 310         *len = pos - buf;
 311
 312         return buf;
 313 }
 314
 315
 316 static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
 317 {
 318         int keylen;
 319         enum wpa_alg alg;
 320         u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
 321
 322         wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
 323
 324         if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
 325                 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
 326                            sm->pairwise_cipher);
 327                 return -1;
 328         }
 329
 330         alg = wpa_cipher_to_alg(sm->pairwise_cipher);
 331         keylen = wpa_cipher_key_len(sm->pairwise_cipher);
 332
 333         if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
 334                            sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) {
 335                 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
 336                 return -1;
 337         }
 338
 339         return 0;
 340 }
 341
 342
 343 /**
 344  * wpa_ft_prepare_auth_request - Generate over-the-air auth request
 345  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 346  * @mdie: Target AP MDIE
 347  * Returns: 0 on success, -1 on failure
 348  */
 349 int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
 350 {
 351         u8 *ft_ies;
 352         size_t ft_ies_len;
 353
 354         /* Generate a new SNonce */
 355         if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
 356                 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
 357                 return -1;
 358         }
 359
 360         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
 361                                     NULL, sm->bssid, NULL, 0, mdie);
 362         if (ft_ies) {
 363                 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
 364                                      ft_ies, ft_ies_len);
 365                 os_free(ft_ies);
 366         }
 367
 368         return 0;
 369 }
 370
 371
 372 int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
 373                             int ft_action, const u8 *target_ap,
 374                             const u8 *ric_ies, size_t ric_ies_len)
 375 {
 376         u8 *ft_ies;
 377         size_t ft_ies_len, ptk_len;
 378         struct wpa_ft_ies parse;
 379         struct rsn_mdie *mdie;
 380         struct rsn_ftie *ftie;
 381         u8 ptk_name[WPA_PMK_NAME_LEN];
 382         int ret;
 383         const u8 *bssid;
 384
 385         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
 386         wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
 387
 388         if (ft_action) {
 389                 if (!sm->over_the_ds_in_progress) {
 390                         wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
 391                                    "- drop FT Action Response");
 392                         return -1;
 393                 }
 394
 395                 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
 396                         wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
 397                                    "with this Target AP - drop FT Action "
 398                                    "Response");
 399                         return -1;
 400                 }
 401         }
 402
 403         if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
 404             sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
 405                 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
 406                            "enabled for this connection");
 407                 return -1;
 408         }
 409
 410         if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
 411                 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
 412                 return -1;
 413         }
 414
 415         mdie = (struct rsn_mdie *) parse.mdie;
 416         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 417             os_memcmp(mdie->mobility_domain, sm->mobility_domain,
 418                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 419                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 420                 return -1;
 421         }
 422
 423         ftie = (struct rsn_ftie *) parse.ftie;
 424         if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
 425                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 426                 return -1;
 427         }
 428
 429         if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
 430                 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
 431                 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
 432                             ftie->snonce, WPA_NONCE_LEN);
 433                 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
 434                             sm->snonce, WPA_NONCE_LEN);
 435                 return -1;
 436         }
 437
 438         if (parse.r0kh_id == NULL) {
 439                 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
 440                 return -1;
 441         }
 442
 443         if (parse.r0kh_id_len != sm->r0kh_id_len ||
 444             os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
 445                 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
 446                            "the current R0KH-ID");
 447                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
 448                             parse.r0kh_id, parse.r0kh_id_len);
 449                 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
 450                             sm->r0kh_id, sm->r0kh_id_len);
 451                 return -1;
 452         }
 453
 454         if (parse.r1kh_id == NULL) {
 455                 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
 456                 return -1;
 457         }
 458
 459         if (parse.rsn_pmkid == NULL ||
 460             os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) {
 461                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
 462                            "RSNIE");
 463                 return -1;
 464         }
 465
 466         os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
 467         wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
 468         wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
 469         wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN);
 470         os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN);
 471         wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
 472                           sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
 473         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
 474         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
 475                     sm->pmk_r1_name, WPA_PMK_NAME_LEN);
 476
 477         bssid = target_ap;
 478         ptk_len = sm->pairwise_cipher != WPA_CIPHER_TKIP ? 48 : 64;
 479         wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr,
 480                           bssid, sm->pmk_r1_name,
 481                           (u8 *) &sm->ptk, ptk_len, ptk_name);
 482         wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
 483                         (u8 *) &sm->ptk, ptk_len);
 484         wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
 485
 486         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
 487                                     sm->pmk_r1_name, sm->ptk.kck, bssid,
 488                                     ric_ies, ric_ies_len,
 489                                     parse.mdie ? parse.mdie - 2 : NULL);
 490         if (ft_ies) {
 491                 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
 492                                      ft_ies, ft_ies_len);
 493                 os_free(ft_ies);
 494         }
 495
 496         wpa_sm_mark_authenticated(sm, bssid);
 497         ret = wpa_ft_install_ptk(sm, bssid);
 498         if (ret) {
 499                 /*
 500                  * Some drivers do not support key configuration when we are
 501                  * not associated with the target AP. Work around this by
 502                  * trying again after the following reassociation gets
 503                  * completed.
 504                  */
 505                 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
 506                            "association - try again after reassociation");
 507                 sm->set_ptk_after_assoc = 1;
 508         } else
 509                 sm->set_ptk_after_assoc = 0;
 510
 511         sm->ft_completed = 1;
 512         if (ft_action) {
 513                 /*
 514                  * The caller is expected trigger re-association with the
 515                  * Target AP.
 516                  */
 517                 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
 518         }
 519
 520         return 0;
 521 }
 522
 523
 524 int wpa_ft_is_completed(struct wpa_sm *sm)
 525 {
 526         if (sm == NULL)
 527                 return 0;
 528
 529         if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
 530             sm->key_mgmt != WPA_KEY_MGMT_FT_PSK)
 531                 return 0;
 532
 533         return sm->ft_completed;
 534 }
 535
 536
 537 static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
 538                                       size_t gtk_elem_len)
 539 {
 540         u8 gtk[32];
 541         int keyidx;
 542         enum wpa_alg alg;
 543         size_t gtk_len, keylen, rsc_len;
 544
 545         if (gtk_elem == NULL) {
 546                 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
 547                 return 0;
 548         }
 549
 550         wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
 551                         gtk_elem, gtk_elem_len);
 552
 553         if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
 554             gtk_elem_len - 19 > sizeof(gtk)) {
 555                 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
 556                            "length %lu", (unsigned long) gtk_elem_len);
 557                 return -1;
 558         }
 559         gtk_len = gtk_elem_len - 19;
 560         if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 11, gtk)) {
 561                 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
 562                            "decrypt GTK");
 563                 return -1;
 564         }
 565
 566         keylen = wpa_cipher_key_len(sm->group_cipher);
 567         rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
 568         alg = wpa_cipher_to_alg(sm->group_cipher);
 569         if (alg == WPA_ALG_NONE) {
 570                 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
 571                            sm->group_cipher);
 572                 return -1;
 573         }
 574
 575         if (gtk_len < keylen) {
 576                 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
 577                 return -1;
 578         }
 579
 580         /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
 581
 582         keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
 583
 584         if (gtk_elem[2] != keylen) {
 585                 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
 586                            "negotiated %lu",
 587                            gtk_elem[2], (unsigned long) keylen);
 588                 return -1;
 589         }
 590
 591         wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
 592         if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0,
 593                            gtk_elem + 3, rsc_len, gtk, keylen) < 0) {
 594                 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
 595                            "driver.");
 596                 return -1;
 597         }
 598
 599         return 0;
 600 }
 601
 602
 603 #ifdef CONFIG_IEEE80211W
 604 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
 605                                        size_t igtk_elem_len)
 606 {
 607         u8 igtk[WPA_IGTK_LEN];
 608         u16 keyidx;
 609
 610         if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
 611                 return 0;
 612
 613         if (igtk_elem == NULL) {
 614                 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
 615                 return 0;
 616         }
 617
 618         wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
 619                         igtk_elem, igtk_elem_len);
 620
 621         if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
 622                 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
 623                            "length %lu", (unsigned long) igtk_elem_len);
 624                 return -1;
 625         }
 626         if (igtk_elem[8] != WPA_IGTK_LEN) {
 627                 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
 628                            "%d", igtk_elem[8]);
 629                 return -1;
 630         }
 631
 632         if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) {
 633                 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
 634                            "decrypt IGTK");
 635                 return -1;
 636         }
 637
 638         /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
 639
 640         keyidx = WPA_GET_LE16(igtk_elem);
 641
 642         wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
 643                         WPA_IGTK_LEN);
 644         if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0,
 645                            igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) {
 646                 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
 647                            "driver.");
 648                 return -1;
 649         }
 650
 651         return 0;
 652 }
 653 #endif /* CONFIG_IEEE80211W */
 654
 655
 656 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
 657                                  size_t ies_len, const u8 *src_addr)
 658 {
 659         struct wpa_ft_ies parse;
 660         struct rsn_mdie *mdie;
 661         struct rsn_ftie *ftie;
 662         unsigned int count;
 663         u8 mic[16];
 664
 665         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
 666
 667         if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
 668             sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
 669                 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
 670                            "enabled for this connection");
 671                 return -1;
 672         }
 673
 674         if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
 675                 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
 676                 return -1;
 677         }
 678
 679         mdie = (struct rsn_mdie *) parse.mdie;
 680         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 681             os_memcmp(mdie->mobility_domain, sm->mobility_domain,
 682                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 683                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 684                 return -1;
 685         }
 686
 687         ftie = (struct rsn_ftie *) parse.ftie;
 688         if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
 689                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 690                 return -1;
 691         }
 692
 693         if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
 694                 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
 695                 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
 696                             ftie->snonce, WPA_NONCE_LEN);
 697                 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
 698                             sm->snonce, WPA_NONCE_LEN);
 699                 return -1;
 700         }
 701
 702         if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
 703                 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
 704                 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
 705                             ftie->anonce, WPA_NONCE_LEN);
 706                 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
 707                             sm->anonce, WPA_NONCE_LEN);
 708                 return -1;
 709         }
 710
 711         if (parse.r0kh_id == NULL) {
 712                 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
 713                 return -1;
 714         }
 715
 716         if (parse.r0kh_id_len != sm->r0kh_id_len ||
 717             os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
 718                 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
 719                            "the current R0KH-ID");
 720                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
 721                             parse.r0kh_id, parse.r0kh_id_len);
 722                 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
 723                             sm->r0kh_id, sm->r0kh_id_len);
 724                 return -1;
 725         }
 726
 727         if (parse.r1kh_id == NULL) {
 728                 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
 729                 return -1;
 730         }
 731
 732         if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
 733                 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
 734                            "ReassocResp");
 735                 return -1;
 736         }
 737
 738         if (parse.rsn_pmkid == NULL ||
 739             os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) {
 740                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
 741                            "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
 742                 return -1;
 743         }
 744
 745         count = 3;
 746         if (parse.ric)
 747                 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
 748         if (ftie->mic_control[1] != count) {
 749                 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
 750                            "Control: received %u expected %u",
 751                            ftie->mic_control[1], count);
 752                 return -1;
 753         }
 754
 755         if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6,
 756                        parse.mdie - 2, parse.mdie_len + 2,
 757                        parse.ftie - 2, parse.ftie_len + 2,
 758                        parse.rsn - 2, parse.rsn_len + 2,
 759                        parse.ric, parse.ric_len,
 760                        mic) < 0) {
 761                 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
 762                 return -1;
 763         }
 764
 765         if (os_memcmp(mic, ftie->mic, 16) != 0) {
 766                 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
 767                 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
 768                 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
 769                 return -1;
 770         }
 771
 772         if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
 773                 return -1;
 774
 775 #ifdef CONFIG_IEEE80211W
 776         if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
 777                 return -1;
 778 #endif /* CONFIG_IEEE80211W */
 779
 780         if (sm->set_ptk_after_assoc) {
 781                 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
 782                            "are associated");
 783                 if (wpa_ft_install_ptk(sm, src_addr) < 0)
 784                         return -1;
 785                 sm->set_ptk_after_assoc = 0;
 786         }
 787
 788         if (parse.ric) {
 789                 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
 790                             parse.ric, parse.ric_len);
 791                 /* TODO: parse response and inform driver about results */
 792         }
 793
 794         return 0;
 795 }
 796
 797
 798 /**
 799  * wpa_ft_start_over_ds - Generate over-the-DS auth request
 800  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 801  * @target_ap: Target AP Address
 802  * @mdie: Mobility Domain IE from the target AP
 803  * Returns: 0 on success, -1 on failure
 804  */
 805 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
 806                          const u8 *mdie)
 807 {
 808         u8 *ft_ies;
 809         size_t ft_ies_len;
 810
 811         wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
 812                    MAC2STR(target_ap));
 813
 814         /* Generate a new SNonce */
 815         if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
 816                 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
 817                 return -1;
 818         }
 819
 820         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
 821                                     NULL, target_ap, NULL, 0, mdie);
 822         if (ft_ies) {
 823                 sm->over_the_ds_in_progress = 1;
 824                 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
 825                 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
 826                 os_free(ft_ies);
 827         }
 828
 829         return 0;
 830 }
 831
 832 #endif /* CONFIG_IEEE80211R */