src/rsn_supp/wpa_ft.c

   1 /*
   2  * WPA Supplicant - IEEE 802.11r - Fast BSS Transition
   3  * Copyright (c) 2006-2015, 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, struct wpa_ptk *ptk)
  23 {
  24         u8 ptk_name[WPA_PMK_NAME_LEN];
  25         const u8 *anonce = key->key_nonce;
  26
  27         if (sm->xxkey_len == 0) {
  28                 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
  29                            "derivation");
  30                 return -1;
  31         }
  32
  33         wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid,
  34                           sm->ssid_len, sm->mobility_domain,
  35                           sm->r0kh_id, sm->r0kh_id_len, sm->own_addr,
  36                           sm->pmk_r0, sm->pmk_r0_name);
  37         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, PMK_LEN);
  38         wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name",
  39                     sm->pmk_r0_name, WPA_PMK_NAME_LEN);
  40         wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
  41                           sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
  42         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
  43         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
  44                     WPA_PMK_NAME_LEN);
  45         return wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr,
  46                                  sm->bssid, sm->pmk_r1_name, ptk, ptk_name,
  47                                  sm->key_mgmt, sm->pairwise_cipher);
  48 }
  49
  50
  51 /**
  52  * wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters
  53  * @sm: Pointer to WPA state machine data from wpa_sm_init()
  54  * @ies: Association Response IEs or %NULL to clear FT parameters
  55  * @ies_len: Length of ies buffer in octets
  56  * Returns: 0 on success, -1 on failure
  57  */
  58 int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *ies, size_t ies_len)
  59 {
  60         struct wpa_ft_ies ft;
  61
  62         if (sm == NULL)
  63                 return 0;
  64
  65         if (wpa_ft_parse_ies(ies, ies_len, &ft) < 0)
  66                 return -1;
  67
  68         if (ft.mdie && ft.mdie_len < MOBILITY_DOMAIN_ID_LEN + 1)
  69                 return -1;
  70
  71         if (ft.mdie) {
  72                 wpa_hexdump(MSG_DEBUG, "FT: Mobility domain",
  73                             ft.mdie, MOBILITY_DOMAIN_ID_LEN);
  74                 os_memcpy(sm->mobility_domain, ft.mdie,
  75                           MOBILITY_DOMAIN_ID_LEN);
  76                 sm->mdie_ft_capab = ft.mdie[MOBILITY_DOMAIN_ID_LEN];
  77                 wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x",
  78                            sm->mdie_ft_capab);
  79         } else
  80                 os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);
  81
  82         if (ft.r0kh_id) {
  83                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID",
  84                             ft.r0kh_id, ft.r0kh_id_len);
  85                 os_memcpy(sm->r0kh_id, ft.r0kh_id, ft.r0kh_id_len);
  86                 sm->r0kh_id_len = ft.r0kh_id_len;
  87         } else {
  88                 /* FIX: When should R0KH-ID be cleared? We need to keep the
  89                  * old R0KH-ID in order to be able to use this during FT. */
  90                 /*
  91                  * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN);
  92                  * sm->r0kh_id_len = 0;
  93                  */
  94         }
  95
  96         if (ft.r1kh_id) {
  97                 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID",
  98                             ft.r1kh_id, FT_R1KH_ID_LEN);
  99                 os_memcpy(sm->r1kh_id, ft.r1kh_id, FT_R1KH_ID_LEN);
 100         } else
 101                 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
 102
 103         os_free(sm->assoc_resp_ies);
 104         sm->assoc_resp_ies = os_malloc(ft.mdie_len + 2 + ft.ftie_len + 2);
 105         if (sm->assoc_resp_ies) {
 106                 u8 *pos = sm->assoc_resp_ies;
 107                 if (ft.mdie) {
 108                         os_memcpy(pos, ft.mdie - 2, ft.mdie_len + 2);
 109                         pos += ft.mdie_len + 2;
 110                 }
 111                 if (ft.ftie) {
 112                         os_memcpy(pos, ft.ftie - 2, ft.ftie_len + 2);
 113                         pos += ft.ftie_len + 2;
 114                 }
 115                 sm->assoc_resp_ies_len = pos - sm->assoc_resp_ies;
 116                 wpa_hexdump(MSG_DEBUG, "FT: Stored MDIE and FTIE from "
 117                             "(Re)Association Response",
 118                             sm->assoc_resp_ies, sm->assoc_resp_ies_len);
 119         }
 120
 121         return 0;
 122 }
 123
 124
 125 /**
 126  * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request
 127  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 128  * @len: Buffer for returning the length of the IEs
 129  * @anonce: ANonce or %NULL if not yet available
 130  * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List
 131  * @kck: 128-bit KCK for MIC or %NULL if no MIC is used
 132  * @kck_len: KCK length in octets
 133  * @target_ap: Target AP address
 134  * @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL
 135  * @ric_ies_len: Length of ric_ies buffer in octets
 136  * @ap_mdie: Mobility Domain IE from the target AP
 137  * Returns: Pointer to buffer with IEs or %NULL on failure
 138  *
 139  * Caller is responsible for freeing the returned buffer with os_free();
 140  */
 141 static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
 142                                const u8 *anonce, const u8 *pmk_name,
 143                                const u8 *kck, size_t kck_len,
 144                                const u8 *target_ap,
 145                                const u8 *ric_ies, size_t ric_ies_len,
 146                                const u8 *ap_mdie)
 147 {
 148         size_t buf_len;
 149         u8 *buf, *pos, *ftie_len, *ftie_pos;
 150         struct rsn_mdie *mdie;
 151         struct rsn_ftie *ftie;
 152         struct rsn_ie_hdr *rsnie;
 153         u16 capab;
 154
 155         sm->ft_completed = 0;
 156
 157         buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
 158                 2 + sm->r0kh_id_len + ric_ies_len + 100;
 159         buf = os_zalloc(buf_len);
 160         if (buf == NULL)
 161                 return NULL;
 162         pos = buf;
 163
 164         /* RSNIE[PMKR0Name/PMKR1Name] */
 165         rsnie = (struct rsn_ie_hdr *) pos;
 166         rsnie->elem_id = WLAN_EID_RSN;
 167         WPA_PUT_LE16(rsnie->version, RSN_VERSION);
 168         pos = (u8 *) (rsnie + 1);
 169
 170         /* Group Suite Selector */
 171         if (sm->group_cipher != WPA_CIPHER_CCMP &&
 172             sm->group_cipher != WPA_CIPHER_GCMP &&
 173             sm->group_cipher != WPA_CIPHER_TKIP) {
 174                 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
 175                            sm->group_cipher);
 176                 os_free(buf);
 177                 return NULL;
 178         }
 179         RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
 180                                                   sm->group_cipher));
 181         pos += RSN_SELECTOR_LEN;
 182
 183         /* Pairwise Suite Count */
 184         WPA_PUT_LE16(pos, 1);
 185         pos += 2;
 186
 187         /* Pairwise Suite List */
 188         if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
 189                 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
 190                            sm->pairwise_cipher);
 191                 os_free(buf);
 192                 return NULL;
 193         }
 194         RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
 195                                                   sm->pairwise_cipher));
 196         pos += RSN_SELECTOR_LEN;
 197
 198         /* Authenticated Key Management Suite Count */
 199         WPA_PUT_LE16(pos, 1);
 200         pos += 2;
 201
 202         /* Authenticated Key Management Suite List */
 203         if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
 204                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
 205         else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
 206                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
 207         else if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE)
 208                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
 209         else {
 210                 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
 211                            sm->key_mgmt);
 212                 os_free(buf);
 213                 return NULL;
 214         }
 215         pos += RSN_SELECTOR_LEN;
 216
 217         /* RSN Capabilities */
 218         capab = 0;
 219 #ifdef CONFIG_IEEE80211W
 220         if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
 221                 capab |= WPA_CAPABILITY_MFPC;
 222 #endif /* CONFIG_IEEE80211W */
 223         WPA_PUT_LE16(pos, capab);
 224         pos += 2;
 225
 226         /* PMKID Count */
 227         WPA_PUT_LE16(pos, 1);
 228         pos += 2;
 229
 230         /* PMKID List [PMKR0Name/PMKR1Name] */
 231         os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
 232         pos += WPA_PMK_NAME_LEN;
 233
 234 #ifdef CONFIG_IEEE80211W
 235         if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
 236                 /* Management Group Cipher Suite */
 237                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
 238                 pos += RSN_SELECTOR_LEN;
 239         }
 240 #endif /* CONFIG_IEEE80211W */
 241
 242         rsnie->len = (pos - (u8 *) rsnie) - 2;
 243
 244         /* MDIE */
 245         *pos++ = WLAN_EID_MOBILITY_DOMAIN;
 246         *pos++ = sizeof(*mdie);
 247         mdie = (struct rsn_mdie *) pos;
 248         pos += sizeof(*mdie);
 249         os_memcpy(mdie->mobility_domain, sm->mobility_domain,
 250                   MOBILITY_DOMAIN_ID_LEN);
 251         mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
 252                 sm->mdie_ft_capab;
 253
 254         /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
 255         ftie_pos = pos;
 256         *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
 257         ftie_len = pos++;
 258         ftie = (struct rsn_ftie *) pos;
 259         pos += sizeof(*ftie);
 260         os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
 261         if (anonce)
 262                 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
 263         if (kck) {
 264                 /* R1KH-ID sub-element in third FT message */
 265                 *pos++ = FTIE_SUBELEM_R1KH_ID;
 266                 *pos++ = FT_R1KH_ID_LEN;
 267                 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
 268                 pos += FT_R1KH_ID_LEN;
 269         }
 270         /* R0KH-ID sub-element */
 271         *pos++ = FTIE_SUBELEM_R0KH_ID;
 272         *pos++ = sm->r0kh_id_len;
 273         os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
 274         pos += sm->r0kh_id_len;
 275         *ftie_len = pos - ftie_len - 1;
 276
 277         if (ric_ies) {
 278                 /* RIC Request */
 279                 os_memcpy(pos, ric_ies, ric_ies_len);
 280                 pos += ric_ies_len;
 281         }
 282
 283         if (kck) {
 284                 /*
 285                  * IEEE Std 802.11r-2008, 11A.8.4
 286                  * MIC shall be calculated over:
 287                  * non-AP STA MAC address
 288                  * Target AP MAC address
 289                  * Transaction seq number (5 for ReassocReq, 3 otherwise)
 290                  * RSN IE
 291                  * MDIE
 292                  * FTIE (with MIC field set to 0)
 293                  * RIC-Request (if present)
 294                  */
 295                 /* Information element count */
 296                 ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies,
 297                                                                ric_ies_len);
 298                 if (wpa_ft_mic(kck, kck_len, sm->own_addr, target_ap, 5,
 299                                ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
 300                                ftie_pos, 2 + *ftie_len,
 301                                (u8 *) rsnie, 2 + rsnie->len, ric_ies,
 302                                ric_ies_len, ftie->mic) < 0) {
 303                         wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
 304                         os_free(buf);
 305                         return NULL;
 306                 }
 307         }
 308
 309         *len = pos - buf;
 310
 311         return buf;
 312 }
 313
 314
 315 static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
 316 {
 317         int keylen;
 318         enum wpa_alg alg;
 319         u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
 320
 321         wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
 322
 323         if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
 324                 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
 325                            sm->pairwise_cipher);
 326                 return -1;
 327         }
 328
 329         alg = wpa_cipher_to_alg(sm->pairwise_cipher);
 330         keylen = wpa_cipher_key_len(sm->pairwise_cipher);
 331
 332         if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
 333                            sizeof(null_rsc), (u8 *) sm->ptk.tk, keylen) < 0) {
 334                 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
 335                 return -1;
 336         }
 337
 338         return 0;
 339 }
 340
 341
 342 /**
 343  * wpa_ft_prepare_auth_request - Generate over-the-air auth request
 344  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 345  * @mdie: Target AP MDIE
 346  * Returns: 0 on success, -1 on failure
 347  */
 348 int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
 349 {
 350         u8 *ft_ies;
 351         size_t ft_ies_len;
 352
 353         /* Generate a new SNonce */
 354         if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
 355                 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
 356                 return -1;
 357         }
 358
 359         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
 360                                     NULL, 0, sm->bssid, NULL, 0, mdie);
 361         if (ft_ies) {
 362                 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
 363                                      ft_ies, ft_ies_len);
 364                 os_free(ft_ies);
 365         }
 366
 367         return 0;
 368 }
 369
 370
 371 int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
 372                             int ft_action, const u8 *target_ap,
 373                             const u8 *ric_ies, size_t ric_ies_len)
 374 {
 375         u8 *ft_ies;
 376         size_t ft_ies_len;
 377         struct wpa_ft_ies parse;
 378         struct rsn_mdie *mdie;
 379         struct rsn_ftie *ftie;
 380         u8 ptk_name[WPA_PMK_NAME_LEN];
 381         int ret;
 382         const u8 *bssid;
 383
 384         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
 385         wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
 386
 387         if (ft_action) {
 388                 if (!sm->over_the_ds_in_progress) {
 389                         wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
 390                                    "- drop FT Action Response");
 391                         return -1;
 392                 }
 393
 394                 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
 395                         wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
 396                                    "with this Target AP - drop FT Action "
 397                                    "Response");
 398                         return -1;
 399                 }
 400         }
 401
 402         if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
 403                 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
 404                            "enabled for this connection");
 405                 return -1;
 406         }
 407
 408         if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
 409                 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
 410                 return -1;
 411         }
 412
 413         mdie = (struct rsn_mdie *) parse.mdie;
 414         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 415             os_memcmp(mdie->mobility_domain, sm->mobility_domain,
 416                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 417                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 418                 return -1;
 419         }
 420
 421         ftie = (struct rsn_ftie *) parse.ftie;
 422         if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
 423                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 424                 return -1;
 425         }
 426
 427         if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
 428                 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
 429                 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
 430                             ftie->snonce, WPA_NONCE_LEN);
 431                 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
 432                             sm->snonce, WPA_NONCE_LEN);
 433                 return -1;
 434         }
 435
 436         if (parse.r0kh_id == NULL) {
 437                 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
 438                 return -1;
 439         }
 440
 441         if (parse.r0kh_id_len != sm->r0kh_id_len ||
 442             os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
 443         {
 444                 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
 445                            "the current R0KH-ID");
 446                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
 447                             parse.r0kh_id, parse.r0kh_id_len);
 448                 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
 449                             sm->r0kh_id, sm->r0kh_id_len);
 450                 return -1;
 451         }
 452
 453         if (parse.r1kh_id == NULL) {
 454                 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
 455                 return -1;
 456         }
 457
 458         if (parse.rsn_pmkid == NULL ||
 459             os_memcmp_const(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN))
 460         {
 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         if (wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce,
 479                               sm->own_addr, bssid, sm->pmk_r1_name, &sm->ptk,
 480                               ptk_name, sm->key_mgmt, sm->pairwise_cipher) < 0)
 481                 return -1;
 482
 483         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
 484                                     sm->pmk_r1_name,
 485                                     sm->ptk.kck, sm->ptk.kck_len, bssid,
 486                                     ric_ies, ric_ies_len,
 487                                     parse.mdie ? parse.mdie - 2 : NULL);
 488         if (ft_ies) {
 489                 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
 490                                      ft_ies, ft_ies_len);
 491                 os_free(ft_ies);
 492         }
 493
 494         wpa_sm_mark_authenticated(sm, bssid);
 495         ret = wpa_ft_install_ptk(sm, bssid);
 496         if (ret) {
 497                 /*
 498                  * Some drivers do not support key configuration when we are
 499                  * not associated with the target AP. Work around this by
 500                  * trying again after the following reassociation gets
 501                  * completed.
 502                  */
 503                 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
 504                            "association - try again after reassociation");
 505                 sm->set_ptk_after_assoc = 1;
 506         } else
 507                 sm->set_ptk_after_assoc = 0;
 508
 509         sm->ft_completed = 1;
 510         if (ft_action) {
 511                 /*
 512                  * The caller is expected trigger re-association with the
 513                  * Target AP.
 514                  */
 515                 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
 516         }
 517
 518         return 0;
 519 }
 520
 521
 522 int wpa_ft_is_completed(struct wpa_sm *sm)
 523 {
 524         if (sm == NULL)
 525                 return 0;
 526
 527         if (!wpa_key_mgmt_ft(sm->key_mgmt))
 528                 return 0;
 529
 530         return sm->ft_completed;
 531 }
 532
 533
 534 void wpa_reset_ft_completed(struct wpa_sm *sm)
 535 {
 536         if (sm != NULL)
 537                 sm->ft_completed = 0;
 538 }
 539
 540
 541 static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
 542                                       size_t gtk_elem_len)
 543 {
 544         u8 gtk[32];
 545         int keyidx;
 546         enum wpa_alg alg;
 547         size_t gtk_len, keylen, rsc_len;
 548
 549         if (gtk_elem == NULL) {
 550                 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
 551                 return 0;
 552         }
 553
 554         wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
 555                         gtk_elem, gtk_elem_len);
 556
 557         if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
 558             gtk_elem_len - 19 > sizeof(gtk)) {
 559                 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
 560                            "length %lu", (unsigned long) gtk_elem_len);
 561                 return -1;
 562         }
 563         gtk_len = gtk_elem_len - 19;
 564         if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, gtk_len / 8, gtk_elem + 11,
 565                        gtk)) {
 566                 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
 567                            "decrypt GTK");
 568                 return -1;
 569         }
 570
 571         keylen = wpa_cipher_key_len(sm->group_cipher);
 572         rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
 573         alg = wpa_cipher_to_alg(sm->group_cipher);
 574         if (alg == WPA_ALG_NONE) {
 575                 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
 576                            sm->group_cipher);
 577                 return -1;
 578         }
 579
 580         if (gtk_len < keylen) {
 581                 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
 582                 return -1;
 583         }
 584
 585         /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
 586
 587         keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
 588
 589         if (gtk_elem[2] != keylen) {
 590                 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
 591                            "negotiated %lu",
 592                            gtk_elem[2], (unsigned long) keylen);
 593                 return -1;
 594         }
 595
 596         wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
 597         if (sm->group_cipher == WPA_CIPHER_TKIP) {
 598                 /* Swap Tx/Rx keys for Michael MIC */
 599                 u8 tmp[8];
 600                 os_memcpy(tmp, gtk + 16, 8);
 601                 os_memcpy(gtk + 16, gtk + 24, 8);
 602                 os_memcpy(gtk + 24, tmp, 8);
 603         }
 604         if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0,
 605                            gtk_elem + 3, rsc_len, gtk, keylen) < 0) {
 606                 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
 607                            "driver.");
 608                 return -1;
 609         }
 610
 611         return 0;
 612 }
 613
 614
 615 #ifdef CONFIG_IEEE80211W
 616 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
 617                                        size_t igtk_elem_len)
 618 {
 619         u8 igtk[WPA_IGTK_LEN];
 620         u16 keyidx;
 621
 622         if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
 623                 return 0;
 624
 625         if (igtk_elem == NULL) {
 626                 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
 627                 return 0;
 628         }
 629
 630         wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
 631                         igtk_elem, igtk_elem_len);
 632
 633         if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
 634                 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
 635                            "length %lu", (unsigned long) igtk_elem_len);
 636                 return -1;
 637         }
 638         if (igtk_elem[8] != WPA_IGTK_LEN) {
 639                 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
 640                            "%d", igtk_elem[8]);
 641                 return -1;
 642         }
 643
 644         if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, WPA_IGTK_LEN / 8,
 645                        igtk_elem + 9, igtk)) {
 646                 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
 647                            "decrypt IGTK");
 648                 return -1;
 649         }
 650
 651         /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
 652
 653         keyidx = WPA_GET_LE16(igtk_elem);
 654
 655         wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
 656                         WPA_IGTK_LEN);
 657         if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0,
 658                            igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) {
 659                 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
 660                            "driver.");
 661                 return -1;
 662         }
 663
 664         return 0;
 665 }
 666 #endif /* CONFIG_IEEE80211W */
 667
 668
 669 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
 670                                  size_t ies_len, const u8 *src_addr)
 671 {
 672         struct wpa_ft_ies parse;
 673         struct rsn_mdie *mdie;
 674         struct rsn_ftie *ftie;
 675         unsigned int count;
 676         u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
 677
 678         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
 679
 680         if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
 681                 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
 682                            "enabled for this connection");
 683                 return -1;
 684         }
 685
 686         if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
 687                 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
 688                 return -1;
 689         }
 690
 691         mdie = (struct rsn_mdie *) parse.mdie;
 692         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 693             os_memcmp(mdie->mobility_domain, sm->mobility_domain,
 694                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 695                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 696                 return -1;
 697         }
 698
 699         ftie = (struct rsn_ftie *) parse.ftie;
 700         if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
 701                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 702                 return -1;
 703         }
 704
 705         if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
 706                 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
 707                 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
 708                             ftie->snonce, WPA_NONCE_LEN);
 709                 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
 710                             sm->snonce, WPA_NONCE_LEN);
 711                 return -1;
 712         }
 713
 714         if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
 715                 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
 716                 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
 717                             ftie->anonce, WPA_NONCE_LEN);
 718                 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
 719                             sm->anonce, WPA_NONCE_LEN);
 720                 return -1;
 721         }
 722
 723         if (parse.r0kh_id == NULL) {
 724                 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
 725                 return -1;
 726         }
 727
 728         if (parse.r0kh_id_len != sm->r0kh_id_len ||
 729             os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
 730         {
 731                 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
 732                            "the current R0KH-ID");
 733                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
 734                             parse.r0kh_id, parse.r0kh_id_len);
 735                 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
 736                             sm->r0kh_id, sm->r0kh_id_len);
 737                 return -1;
 738         }
 739
 740         if (parse.r1kh_id == NULL) {
 741                 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
 742                 return -1;
 743         }
 744
 745         if (os_memcmp_const(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
 746                 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
 747                            "ReassocResp");
 748                 return -1;
 749         }
 750
 751         if (parse.rsn_pmkid == NULL ||
 752             os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
 753         {
 754                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
 755                            "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
 756                 return -1;
 757         }
 758
 759         count = 3;
 760         if (parse.ric)
 761                 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
 762         if (ftie->mic_control[1] != count) {
 763                 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
 764                            "Control: received %u expected %u",
 765                            ftie->mic_control[1], count);
 766                 return -1;
 767         }
 768
 769         if (wpa_ft_mic(sm->ptk.kck, sm->ptk.kck_len, sm->own_addr, src_addr, 6,
 770                        parse.mdie - 2, parse.mdie_len + 2,
 771                        parse.ftie - 2, parse.ftie_len + 2,
 772                        parse.rsn - 2, parse.rsn_len + 2,
 773                        parse.ric, parse.ric_len,
 774                        mic) < 0) {
 775                 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
 776                 return -1;
 777         }
 778
 779         if (os_memcmp_const(mic, ftie->mic, 16) != 0) {
 780                 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
 781                 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
 782                 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
 783                 return -1;
 784         }
 785
 786         if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
 787                 return -1;
 788
 789 #ifdef CONFIG_IEEE80211W
 790         if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
 791                 return -1;
 792 #endif /* CONFIG_IEEE80211W */
 793
 794         if (sm->set_ptk_after_assoc) {
 795                 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
 796                            "are associated");
 797                 if (wpa_ft_install_ptk(sm, src_addr) < 0)
 798                         return -1;
 799                 sm->set_ptk_after_assoc = 0;
 800         }
 801
 802         if (parse.ric) {
 803                 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
 804                             parse.ric, parse.ric_len);
 805                 /* TODO: parse response and inform driver about results when
 806                  * using wpa_supplicant SME */
 807         }
 808
 809         wpa_printf(MSG_DEBUG, "FT: Completed successfully");
 810
 811         return 0;
 812 }
 813
 814
 815 /**
 816  * wpa_ft_start_over_ds - Generate over-the-DS auth request
 817  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 818  * @target_ap: Target AP Address
 819  * @mdie: Mobility Domain IE from the target AP
 820  * Returns: 0 on success, -1 on failure
 821  */
 822 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
 823                          const u8 *mdie)
 824 {
 825         u8 *ft_ies;
 826         size_t ft_ies_len;
 827
 828         wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
 829                    MAC2STR(target_ap));
 830
 831         /* Generate a new SNonce */
 832         if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
 833                 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
 834                 return -1;
 835         }
 836
 837         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
 838                                     NULL, 0, target_ap, NULL, 0, mdie);
 839         if (ft_ies) {
 840                 sm->over_the_ds_in_progress = 1;
 841                 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
 842                 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
 843                 os_free(ft_ies);
 844         }
 845
 846         return 0;
 847 }
 848
 849 #endif /* CONFIG_IEEE80211R */