contrib/wpa/src/rsn_supp/wpa_ft.c

   1 /*
   2  * WPA Supplicant - IEEE 802.11r - Fast BSS Transition
   3  * Copyright (c) 2006-2018, 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/sha384.h"
  14 #include "crypto/random.h"
  15 #include "common/ieee802_11_defs.h"
  16 #include "common/ieee802_11_common.h"
  17 #include "common/ocv.h"
  18 #include "drivers/driver.h"
  19 #include "wpa.h"
  20 #include "wpa_i.h"
  21
  22 #ifdef CONFIG_IEEE80211R
  23
  24 int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr,
  25                       const struct wpa_eapol_key *key, struct wpa_ptk *ptk)
  26 {
  27         u8 ptk_name[WPA_PMK_NAME_LEN];
  28         const u8 *anonce = key->key_nonce;
  29         int use_sha384 = wpa_key_mgmt_sha384(sm->key_mgmt);
  30
  31         if (sm->xxkey_len == 0) {
  32                 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
  33                            "derivation");
  34                 return -1;
  35         }
  36
  37         sm->pmk_r0_len = use_sha384 ? SHA384_MAC_LEN : PMK_LEN;
  38         if (wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid,
  39                               sm->ssid_len, sm->mobility_domain,
  40                               sm->r0kh_id, sm->r0kh_id_len, sm->own_addr,
  41                               sm->pmk_r0, sm->pmk_r0_name, use_sha384) < 0)
  42                 return -1;
  43         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, sm->pmk_r0_len);
  44         wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name",
  45                     sm->pmk_r0_name, WPA_PMK_NAME_LEN);
  46         sm->pmk_r1_len = sm->pmk_r0_len;
  47         if (wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_len, sm->pmk_r0_name,
  48                               sm->r1kh_id, sm->own_addr, sm->pmk_r1,
  49                               sm->pmk_r1_name) < 0)
  50                 return -1;
  51         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, sm->pmk_r1_len);
  52         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
  53                     WPA_PMK_NAME_LEN);
  54         return wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->pmk_r1_len, sm->snonce, anonce,
  55                                  sm->own_addr, sm->bssid, sm->pmk_r1_name, ptk,
  56                                  ptk_name, sm->key_mgmt, sm->pairwise_cipher);
  57 }
  58
  59
  60 /**
  61  * wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters
  62  * @sm: Pointer to WPA state machine data from wpa_sm_init()
  63  * @ies: Association Response IEs or %NULL to clear FT parameters
  64  * @ies_len: Length of ies buffer in octets
  65  * Returns: 0 on success, -1 on failure
  66  */
  67 int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *ies, size_t ies_len)
  68 {
  69         struct wpa_ft_ies ft;
  70         int use_sha384;
  71
  72         if (sm == NULL)
  73                 return 0;
  74
  75         use_sha384 = wpa_key_mgmt_sha384(sm->key_mgmt);
  76         if (wpa_ft_parse_ies(ies, ies_len, &ft, use_sha384) < 0)
  77                 return -1;
  78
  79         if (ft.mdie && ft.mdie_len < MOBILITY_DOMAIN_ID_LEN + 1)
  80                 return -1;
  81
  82         if (ft.mdie) {
  83                 wpa_hexdump(MSG_DEBUG, "FT: Mobility domain",
  84                             ft.mdie, MOBILITY_DOMAIN_ID_LEN);
  85                 os_memcpy(sm->mobility_domain, ft.mdie,
  86                           MOBILITY_DOMAIN_ID_LEN);
  87                 sm->mdie_ft_capab = ft.mdie[MOBILITY_DOMAIN_ID_LEN];
  88                 wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x",
  89                            sm->mdie_ft_capab);
  90         } else
  91                 os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);
  92
  93         if (ft.r0kh_id) {
  94                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID",
  95                             ft.r0kh_id, ft.r0kh_id_len);
  96                 os_memcpy(sm->r0kh_id, ft.r0kh_id, ft.r0kh_id_len);
  97                 sm->r0kh_id_len = ft.r0kh_id_len;
  98         } else {
  99                 /* FIX: When should R0KH-ID be cleared? We need to keep the
 100                  * old R0KH-ID in order to be able to use this during FT. */
 101                 /*
 102                  * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN);
 103                  * sm->r0kh_id_len = 0;
 104                  */
 105         }
 106
 107         if (ft.r1kh_id) {
 108                 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID",
 109                             ft.r1kh_id, FT_R1KH_ID_LEN);
 110                 os_memcpy(sm->r1kh_id, ft.r1kh_id, FT_R1KH_ID_LEN);
 111         } else
 112                 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
 113
 114         os_free(sm->assoc_resp_ies);
 115         sm->assoc_resp_ies = os_malloc(ft.mdie_len + 2 + ft.ftie_len + 2);
 116         if (sm->assoc_resp_ies) {
 117                 u8 *pos = sm->assoc_resp_ies;
 118                 if (ft.mdie) {
 119                         os_memcpy(pos, ft.mdie - 2, ft.mdie_len + 2);
 120                         pos += ft.mdie_len + 2;
 121                 }
 122                 if (ft.ftie) {
 123                         os_memcpy(pos, ft.ftie - 2, ft.ftie_len + 2);
 124                         pos += ft.ftie_len + 2;
 125                 }
 126                 sm->assoc_resp_ies_len = pos - sm->assoc_resp_ies;
 127                 wpa_hexdump(MSG_DEBUG, "FT: Stored MDIE and FTIE from "
 128                             "(Re)Association Response",
 129                             sm->assoc_resp_ies, sm->assoc_resp_ies_len);
 130         }
 131
 132         return 0;
 133 }
 134
 135
 136 /**
 137  * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request
 138  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 139  * @len: Buffer for returning the length of the IEs
 140  * @anonce: ANonce or %NULL if not yet available
 141  * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List
 142  * @kck: 128-bit KCK for MIC or %NULL if no MIC is used
 143  * @kck_len: KCK length in octets
 144  * @target_ap: Target AP address
 145  * @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL
 146  * @ric_ies_len: Length of ric_ies buffer in octets
 147  * @ap_mdie: Mobility Domain IE from the target AP
 148  * Returns: Pointer to buffer with IEs or %NULL on failure
 149  *
 150  * Caller is responsible for freeing the returned buffer with os_free();
 151  */
 152 static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
 153                                const u8 *anonce, const u8 *pmk_name,
 154                                const u8 *kck, size_t kck_len,
 155                                const u8 *target_ap,
 156                                const u8 *ric_ies, size_t ric_ies_len,
 157                                const u8 *ap_mdie)
 158 {
 159         size_t buf_len;
 160         u8 *buf, *pos, *ftie_len, *ftie_pos, *fte_mic, *elem_count;
 161         struct rsn_mdie *mdie;
 162         struct rsn_ie_hdr *rsnie;
 163         u16 capab;
 164         int mdie_len;
 165
 166         sm->ft_completed = 0;
 167         sm->ft_reassoc_completed = 0;
 168
 169         buf_len = 2 + sizeof(struct rsn_mdie) + 2 +
 170                 sizeof(struct rsn_ftie_sha384) +
 171                 2 + sm->r0kh_id_len + ric_ies_len + 100;
 172         buf = os_zalloc(buf_len);
 173         if (buf == NULL)
 174                 return NULL;
 175         pos = buf;
 176
 177         /* RSNIE[PMKR0Name/PMKR1Name] */
 178         rsnie = (struct rsn_ie_hdr *) pos;
 179         rsnie->elem_id = WLAN_EID_RSN;
 180         WPA_PUT_LE16(rsnie->version, RSN_VERSION);
 181         pos = (u8 *) (rsnie + 1);
 182
 183         /* Group Suite Selector */
 184         if (!wpa_cipher_valid_group(sm->group_cipher)) {
 185                 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
 186                            sm->group_cipher);
 187                 os_free(buf);
 188                 return NULL;
 189         }
 190         RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
 191                                                   sm->group_cipher));
 192         pos += RSN_SELECTOR_LEN;
 193
 194         /* Pairwise Suite Count */
 195         WPA_PUT_LE16(pos, 1);
 196         pos += 2;
 197
 198         /* Pairwise Suite List */
 199         if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
 200                 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
 201                            sm->pairwise_cipher);
 202                 os_free(buf);
 203                 return NULL;
 204         }
 205         RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
 206                                                   sm->pairwise_cipher));
 207         pos += RSN_SELECTOR_LEN;
 208
 209         /* Authenticated Key Management Suite Count */
 210         WPA_PUT_LE16(pos, 1);
 211         pos += 2;
 212
 213         /* Authenticated Key Management Suite List */
 214         if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
 215                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
 216 #ifdef CONFIG_SHA384
 217         else if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X_SHA384)
 218                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X_SHA384);
 219 #endif /* CONFIG_SHA384 */
 220         else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
 221                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
 222         else if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE)
 223                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
 224 #ifdef CONFIG_FILS
 225         else if (sm->key_mgmt == WPA_KEY_MGMT_FT_FILS_SHA256)
 226                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA256);
 227         else if (sm->key_mgmt == WPA_KEY_MGMT_FT_FILS_SHA384)
 228                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA384);
 229 #endif /* CONFIG_FILS */
 230         else {
 231                 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
 232                            sm->key_mgmt);
 233                 os_free(buf);
 234                 return NULL;
 235         }
 236         pos += RSN_SELECTOR_LEN;
 237
 238         /* RSN Capabilities */
 239         capab = 0;
 240 #ifdef CONFIG_IEEE80211W
 241         if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC ||
 242             sm->mgmt_group_cipher == WPA_CIPHER_BIP_GMAC_128 ||
 243             sm->mgmt_group_cipher == WPA_CIPHER_BIP_GMAC_256 ||
 244             sm->mgmt_group_cipher == WPA_CIPHER_BIP_CMAC_256)
 245                 capab |= WPA_CAPABILITY_MFPC;
 246 #endif /* CONFIG_IEEE80211W */
 247         if (sm->ocv)
 248                 capab |= WPA_CAPABILITY_OCVC;
 249         WPA_PUT_LE16(pos, capab);
 250         pos += 2;
 251
 252         /* PMKID Count */
 253         WPA_PUT_LE16(pos, 1);
 254         pos += 2;
 255
 256         /* PMKID List [PMKR0Name/PMKR1Name] */
 257         os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
 258         pos += WPA_PMK_NAME_LEN;
 259
 260 #ifdef CONFIG_IEEE80211W
 261         /* Management Group Cipher Suite */
 262         switch (sm->mgmt_group_cipher) {
 263         case WPA_CIPHER_AES_128_CMAC:
 264                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
 265                 pos += RSN_SELECTOR_LEN;
 266                 break;
 267         case WPA_CIPHER_BIP_GMAC_128:
 268                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_BIP_GMAC_128);
 269                 pos += RSN_SELECTOR_LEN;
 270                 break;
 271         case WPA_CIPHER_BIP_GMAC_256:
 272                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_BIP_GMAC_256);
 273                 pos += RSN_SELECTOR_LEN;
 274                 break;
 275         case WPA_CIPHER_BIP_CMAC_256:
 276                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_BIP_CMAC_256);
 277                 pos += RSN_SELECTOR_LEN;
 278                 break;
 279         }
 280 #endif /* CONFIG_IEEE80211W */
 281
 282         rsnie->len = (pos - (u8 *) rsnie) - 2;
 283
 284         /* MDIE */
 285         mdie_len = wpa_ft_add_mdie(sm, pos, buf_len - (pos - buf), ap_mdie);
 286         if (mdie_len <= 0) {
 287                 os_free(buf);
 288                 return NULL;
 289         }
 290         mdie = (struct rsn_mdie *) (pos + 2);
 291         pos += mdie_len;
 292
 293         /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
 294         ftie_pos = pos;
 295         *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
 296         ftie_len = pos++;
 297         if (wpa_key_mgmt_sha384(sm->key_mgmt)) {
 298                 struct rsn_ftie_sha384 *ftie;
 299
 300                 ftie = (struct rsn_ftie_sha384 *) pos;
 301                 fte_mic = ftie->mic;
 302                 elem_count = &ftie->mic_control[1];
 303                 pos += sizeof(*ftie);
 304                 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
 305                 if (anonce)
 306                         os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
 307         } else {
 308                 struct rsn_ftie *ftie;
 309
 310                 ftie = (struct rsn_ftie *) pos;
 311                 fte_mic = ftie->mic;
 312                 elem_count = &ftie->mic_control[1];
 313                 pos += sizeof(*ftie);
 314                 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
 315                 if (anonce)
 316                         os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
 317         }
 318         if (kck) {
 319                 /* R1KH-ID sub-element in third FT message */
 320                 *pos++ = FTIE_SUBELEM_R1KH_ID;
 321                 *pos++ = FT_R1KH_ID_LEN;
 322                 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
 323                 pos += FT_R1KH_ID_LEN;
 324         }
 325         /* R0KH-ID sub-element */
 326         *pos++ = FTIE_SUBELEM_R0KH_ID;
 327         *pos++ = sm->r0kh_id_len;
 328         os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
 329         pos += sm->r0kh_id_len;
 330 #ifdef CONFIG_OCV
 331         if (kck && wpa_sm_ocv_enabled(sm)) {
 332                 /* OCI sub-element in the third FT message */
 333                 struct wpa_channel_info ci;
 334
 335                 if (wpa_sm_channel_info(sm, &ci) != 0) {
 336                         wpa_printf(MSG_WARNING,
 337                                    "Failed to get channel info for OCI element in FTE");
 338                         os_free(buf);
 339                         return NULL;
 340                 }
 341
 342                 *pos++ = FTIE_SUBELEM_OCI;
 343                 *pos++ = OCV_OCI_LEN;
 344                 if (ocv_insert_oci(&ci, &pos) < 0) {
 345                         os_free(buf);
 346                         return NULL;
 347                 }
 348         }
 349 #endif /* CONFIG_OCV */
 350         *ftie_len = pos - ftie_len - 1;
 351
 352         if (ric_ies) {
 353                 /* RIC Request */
 354                 os_memcpy(pos, ric_ies, ric_ies_len);
 355                 pos += ric_ies_len;
 356         }
 357
 358         if (kck) {
 359                 /*
 360                  * IEEE Std 802.11r-2008, 11A.8.4
 361                  * MIC shall be calculated over:
 362                  * non-AP STA MAC address
 363                  * Target AP MAC address
 364                  * Transaction seq number (5 for ReassocReq, 3 otherwise)
 365                  * RSN IE
 366                  * MDIE
 367                  * FTIE (with MIC field set to 0)
 368                  * RIC-Request (if present)
 369                  */
 370                 /* Information element count */
 371                 *elem_count = 3 + ieee802_11_ie_count(ric_ies, ric_ies_len);
 372                 if (wpa_ft_mic(kck, kck_len, sm->own_addr, target_ap, 5,
 373                                ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
 374                                ftie_pos, 2 + *ftie_len,
 375                                (u8 *) rsnie, 2 + rsnie->len, ric_ies,
 376                                ric_ies_len, fte_mic) < 0) {
 377                         wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
 378                         os_free(buf);
 379                         return NULL;
 380                 }
 381         }
 382
 383         *len = pos - buf;
 384
 385         return buf;
 386 }
 387
 388
 389 static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
 390 {
 391         int keylen;
 392         enum wpa_alg alg;
 393         u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
 394
 395         wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
 396
 397         if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
 398                 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
 399                            sm->pairwise_cipher);
 400                 return -1;
 401         }
 402
 403         alg = wpa_cipher_to_alg(sm->pairwise_cipher);
 404         keylen = wpa_cipher_key_len(sm->pairwise_cipher);
 405
 406         if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
 407                            sizeof(null_rsc), (u8 *) sm->ptk.tk, keylen) < 0) {
 408                 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
 409                 return -1;
 410         }
 411
 412         return 0;
 413 }
 414
 415
 416 /**
 417  * wpa_ft_prepare_auth_request - Generate over-the-air auth request
 418  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 419  * @mdie: Target AP MDIE
 420  * Returns: 0 on success, -1 on failure
 421  */
 422 int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
 423 {
 424         u8 *ft_ies;
 425         size_t ft_ies_len;
 426
 427         /* Generate a new SNonce */
 428         if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
 429                 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
 430                 return -1;
 431         }
 432
 433         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
 434                                     NULL, 0, sm->bssid, NULL, 0, mdie);
 435         if (ft_ies) {
 436                 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
 437                                      ft_ies, ft_ies_len);
 438                 os_free(ft_ies);
 439         }
 440
 441         return 0;
 442 }
 443
 444
 445 int wpa_ft_add_mdie(struct wpa_sm *sm, u8 *buf, size_t buf_len,
 446                     const u8 *ap_mdie)
 447 {
 448         u8 *pos = buf;
 449         struct rsn_mdie *mdie;
 450
 451         if (buf_len < 2 + sizeof(*mdie)) {
 452                 wpa_printf(MSG_INFO,
 453                            "FT: Failed to add MDIE: short buffer, length=%zu",
 454                            buf_len);
 455                 return 0;
 456         }
 457
 458         *pos++ = WLAN_EID_MOBILITY_DOMAIN;
 459         *pos++ = sizeof(*mdie);
 460         mdie = (struct rsn_mdie *) pos;
 461         os_memcpy(mdie->mobility_domain, sm->mobility_domain,
 462                   MOBILITY_DOMAIN_ID_LEN);
 463         mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
 464                 sm->mdie_ft_capab;
 465
 466         return 2 + sizeof(*mdie);
 467 }
 468
 469
 470 const u8 * wpa_sm_get_ft_md(struct wpa_sm *sm)
 471 {
 472         return sm->mobility_domain;
 473 }
 474
 475
 476 int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
 477                             int ft_action, const u8 *target_ap,
 478                             const u8 *ric_ies, size_t ric_ies_len)
 479 {
 480         u8 *ft_ies;
 481         size_t ft_ies_len;
 482         struct wpa_ft_ies parse;
 483         struct rsn_mdie *mdie;
 484         u8 ptk_name[WPA_PMK_NAME_LEN];
 485         int ret;
 486         const u8 *bssid;
 487         const u8 *kck;
 488         size_t kck_len;
 489         int use_sha384 = wpa_key_mgmt_sha384(sm->key_mgmt);
 490         const u8 *anonce, *snonce;
 491
 492         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
 493         wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
 494
 495         if (ft_action) {
 496                 if (!sm->over_the_ds_in_progress) {
 497                         wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
 498                                    "- drop FT Action Response");
 499                         return -1;
 500                 }
 501
 502                 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
 503                         wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
 504                                    "with this Target AP - drop FT Action "
 505                                    "Response");
 506                         return -1;
 507                 }
 508         }
 509
 510         if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
 511                 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
 512                            "enabled for this connection");
 513                 return -1;
 514         }
 515
 516         if (wpa_ft_parse_ies(ies, ies_len, &parse, use_sha384) < 0) {
 517                 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
 518                 return -1;
 519         }
 520
 521         mdie = (struct rsn_mdie *) parse.mdie;
 522         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 523             os_memcmp(mdie->mobility_domain, sm->mobility_domain,
 524                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 525                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 526                 return -1;
 527         }
 528
 529         if (use_sha384) {
 530                 struct rsn_ftie_sha384 *ftie;
 531
 532                 ftie = (struct rsn_ftie_sha384 *) parse.ftie;
 533                 if (!ftie || parse.ftie_len < sizeof(*ftie)) {
 534                         wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 535                         return -1;
 536                 }
 537
 538                 anonce = ftie->anonce;
 539                 snonce = ftie->snonce;
 540         } else {
 541                 struct rsn_ftie *ftie;
 542
 543                 ftie = (struct rsn_ftie *) parse.ftie;
 544                 if (!ftie || parse.ftie_len < sizeof(*ftie)) {
 545                         wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 546                         return -1;
 547                 }
 548
 549                 anonce = ftie->anonce;
 550                 snonce = ftie->snonce;
 551         }
 552
 553         if (os_memcmp(snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
 554                 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
 555                 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
 556                             snonce, WPA_NONCE_LEN);
 557                 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
 558                             sm->snonce, WPA_NONCE_LEN);
 559                 return -1;
 560         }
 561
 562         if (parse.r0kh_id == NULL) {
 563                 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
 564                 return -1;
 565         }
 566
 567         if (parse.r0kh_id_len != sm->r0kh_id_len ||
 568             os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
 569         {
 570                 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
 571                            "the current R0KH-ID");
 572                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
 573                             parse.r0kh_id, parse.r0kh_id_len);
 574                 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
 575                             sm->r0kh_id, sm->r0kh_id_len);
 576                 return -1;
 577         }
 578
 579         if (parse.r1kh_id == NULL) {
 580                 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
 581                 return -1;
 582         }
 583
 584         if (parse.rsn_pmkid == NULL ||
 585             os_memcmp_const(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN))
 586         {
 587                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
 588                            "RSNIE");
 589                 return -1;
 590         }
 591
 592         os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
 593         wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
 594         wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
 595         wpa_hexdump(MSG_DEBUG, "FT: ANonce", anonce, WPA_NONCE_LEN);
 596         os_memcpy(sm->anonce, anonce, WPA_NONCE_LEN);
 597         if (wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_len, sm->pmk_r0_name,
 598                               sm->r1kh_id, sm->own_addr, sm->pmk_r1,
 599                               sm->pmk_r1_name) < 0)
 600                 return -1;
 601         sm->pmk_r1_len = sm->pmk_r0_len;
 602         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, sm->pmk_r1_len);
 603         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
 604                     sm->pmk_r1_name, WPA_PMK_NAME_LEN);
 605
 606         bssid = target_ap;
 607         if (wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->pmk_r1_len, sm->snonce,
 608                               anonce, sm->own_addr, bssid,
 609                               sm->pmk_r1_name, &sm->ptk, ptk_name, sm->key_mgmt,
 610                               sm->pairwise_cipher) < 0)
 611                 return -1;
 612
 613         if (wpa_key_mgmt_fils(sm->key_mgmt)) {
 614                 kck = sm->ptk.kck2;
 615                 kck_len = sm->ptk.kck2_len;
 616         } else {
 617                 kck = sm->ptk.kck;
 618                 kck_len = sm->ptk.kck_len;
 619         }
 620         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, anonce,
 621                                     sm->pmk_r1_name,
 622                                     kck, kck_len, bssid,
 623                                     ric_ies, ric_ies_len,
 624                                     parse.mdie ? parse.mdie - 2 : NULL);
 625         if (ft_ies) {
 626                 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
 627                                      ft_ies, ft_ies_len);
 628                 os_free(ft_ies);
 629         }
 630
 631         wpa_sm_mark_authenticated(sm, bssid);
 632         ret = wpa_ft_install_ptk(sm, bssid);
 633         if (ret) {
 634                 /*
 635                  * Some drivers do not support key configuration when we are
 636                  * not associated with the target AP. Work around this by
 637                  * trying again after the following reassociation gets
 638                  * completed.
 639                  */
 640                 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
 641                            "association - try again after reassociation");
 642                 sm->set_ptk_after_assoc = 1;
 643         } else
 644                 sm->set_ptk_after_assoc = 0;
 645
 646         sm->ft_completed = 1;
 647         if (ft_action) {
 648                 /*
 649                  * The caller is expected trigger re-association with the
 650                  * Target AP.
 651                  */
 652                 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
 653         }
 654
 655         return 0;
 656 }
 657
 658
 659 int wpa_ft_is_completed(struct wpa_sm *sm)
 660 {
 661         if (sm == NULL)
 662                 return 0;
 663
 664         if (!wpa_key_mgmt_ft(sm->key_mgmt))
 665                 return 0;
 666
 667         return sm->ft_completed;
 668 }
 669
 670
 671 void wpa_reset_ft_completed(struct wpa_sm *sm)
 672 {
 673         if (sm != NULL)
 674                 sm->ft_completed = 0;
 675 }
 676
 677
 678 static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
 679                                       size_t gtk_elem_len)
 680 {
 681         u8 gtk[32];
 682         int keyidx;
 683         enum wpa_alg alg;
 684         size_t gtk_len, keylen, rsc_len;
 685         const u8 *kek;
 686         size_t kek_len;
 687
 688         if (wpa_key_mgmt_fils(sm->key_mgmt)) {
 689                 kek = sm->ptk.kek2;
 690                 kek_len = sm->ptk.kek2_len;
 691         } else {
 692                 kek = sm->ptk.kek;
 693                 kek_len = sm->ptk.kek_len;
 694         }
 695
 696         if (gtk_elem == NULL) {
 697                 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
 698                 return 0;
 699         }
 700
 701         wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
 702                         gtk_elem, gtk_elem_len);
 703
 704         if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
 705             gtk_elem_len - 19 > sizeof(gtk)) {
 706                 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
 707                            "length %lu", (unsigned long) gtk_elem_len);
 708                 return -1;
 709         }
 710         gtk_len = gtk_elem_len - 19;
 711         if (aes_unwrap(kek, kek_len, gtk_len / 8, gtk_elem + 11, gtk)) {
 712                 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
 713                            "decrypt GTK");
 714                 return -1;
 715         }
 716
 717         keylen = wpa_cipher_key_len(sm->group_cipher);
 718         rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
 719         alg = wpa_cipher_to_alg(sm->group_cipher);
 720         if (alg == WPA_ALG_NONE) {
 721                 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
 722                            sm->group_cipher);
 723                 return -1;
 724         }
 725
 726         if (gtk_len < keylen) {
 727                 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
 728                 return -1;
 729         }
 730
 731         /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
 732
 733         keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
 734
 735         if (gtk_elem[2] != keylen) {
 736                 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
 737                            "negotiated %lu",
 738                            gtk_elem[2], (unsigned long) keylen);
 739                 return -1;
 740         }
 741
 742         wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
 743         if (sm->group_cipher == WPA_CIPHER_TKIP) {
 744                 /* Swap Tx/Rx keys for Michael MIC */
 745                 u8 tmp[8];
 746                 os_memcpy(tmp, gtk + 16, 8);
 747                 os_memcpy(gtk + 16, gtk + 24, 8);
 748                 os_memcpy(gtk + 24, tmp, 8);
 749         }
 750         if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0,
 751                            gtk_elem + 3, rsc_len, gtk, keylen) < 0) {
 752                 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
 753                            "driver.");
 754                 return -1;
 755         }
 756
 757         return 0;
 758 }
 759
 760
 761 #ifdef CONFIG_IEEE80211W
 762 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
 763                                        size_t igtk_elem_len)
 764 {
 765         u8 igtk[WPA_IGTK_MAX_LEN];
 766         size_t igtk_len;
 767         u16 keyidx;
 768         const u8 *kek;
 769         size_t kek_len;
 770
 771         if (wpa_key_mgmt_fils(sm->key_mgmt)) {
 772                 kek = sm->ptk.kek2;
 773                 kek_len = sm->ptk.kek2_len;
 774         } else {
 775                 kek = sm->ptk.kek;
 776                 kek_len = sm->ptk.kek_len;
 777         }
 778
 779         if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC &&
 780             sm->mgmt_group_cipher != WPA_CIPHER_BIP_GMAC_128 &&
 781             sm->mgmt_group_cipher != WPA_CIPHER_BIP_GMAC_256 &&
 782             sm->mgmt_group_cipher != WPA_CIPHER_BIP_CMAC_256)
 783                 return 0;
 784
 785         if (igtk_elem == NULL) {
 786                 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
 787                 return 0;
 788         }
 789
 790         wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
 791                         igtk_elem, igtk_elem_len);
 792
 793         igtk_len = wpa_cipher_key_len(sm->mgmt_group_cipher);
 794         if (igtk_elem_len != 2 + 6 + 1 + igtk_len + 8) {
 795                 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
 796                            "length %lu", (unsigned long) igtk_elem_len);
 797                 return -1;
 798         }
 799         if (igtk_elem[8] != igtk_len) {
 800                 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
 801                            "%d", igtk_elem[8]);
 802                 return -1;
 803         }
 804
 805         if (aes_unwrap(kek, kek_len, igtk_len / 8, igtk_elem + 9, igtk)) {
 806                 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
 807                            "decrypt IGTK");
 808                 return -1;
 809         }
 810
 811         /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
 812
 813         keyidx = WPA_GET_LE16(igtk_elem);
 814
 815         wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
 816                         igtk_len);
 817         if (wpa_sm_set_key(sm, wpa_cipher_to_alg(sm->mgmt_group_cipher),
 818                            broadcast_ether_addr, keyidx, 0,
 819                            igtk_elem + 2, 6, igtk, igtk_len) < 0) {
 820                 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
 821                            "driver.");
 822                 os_memset(igtk, 0, sizeof(igtk));
 823                 return -1;
 824         }
 825         os_memset(igtk, 0, sizeof(igtk));
 826
 827         return 0;
 828 }
 829 #endif /* CONFIG_IEEE80211W */
 830
 831
 832 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
 833                                  size_t ies_len, const u8 *src_addr)
 834 {
 835         struct wpa_ft_ies parse;
 836         struct rsn_mdie *mdie;
 837         unsigned int count;
 838         u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
 839         const u8 *kck;
 840         size_t kck_len;
 841         int use_sha384 = wpa_key_mgmt_sha384(sm->key_mgmt);
 842         const u8 *anonce, *snonce, *fte_mic;
 843         u8 fte_elem_count;
 844
 845         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
 846
 847         if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
 848                 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
 849                            "enabled for this connection");
 850                 return -1;
 851         }
 852
 853         if (sm->ft_reassoc_completed) {
 854                 wpa_printf(MSG_DEBUG, "FT: Reassociation has already been completed for this FT protocol instance - ignore unexpected retransmission");
 855                 return 0;
 856         }
 857
 858         if (wpa_ft_parse_ies(ies, ies_len, &parse, use_sha384) < 0) {
 859                 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
 860                 return -1;
 861         }
 862
 863         mdie = (struct rsn_mdie *) parse.mdie;
 864         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 865             os_memcmp(mdie->mobility_domain, sm->mobility_domain,
 866                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 867                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 868                 return -1;
 869         }
 870
 871         if (use_sha384) {
 872                 struct rsn_ftie_sha384 *ftie;
 873
 874                 ftie = (struct rsn_ftie_sha384 *) parse.ftie;
 875                 if (!ftie || parse.ftie_len < sizeof(*ftie)) {
 876                         wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 877                         return -1;
 878                 }
 879
 880                 anonce = ftie->anonce;
 881                 snonce = ftie->snonce;
 882                 fte_elem_count = ftie->mic_control[1];
 883                 fte_mic = ftie->mic;
 884         } else {
 885                 struct rsn_ftie *ftie;
 886
 887                 ftie = (struct rsn_ftie *) parse.ftie;
 888                 if (!ftie || parse.ftie_len < sizeof(*ftie)) {
 889                         wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 890                         return -1;
 891                 }
 892
 893                 anonce = ftie->anonce;
 894                 snonce = ftie->snonce;
 895                 fte_elem_count = ftie->mic_control[1];
 896                 fte_mic = ftie->mic;
 897         }
 898
 899         if (os_memcmp(snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
 900                 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
 901                 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
 902                             snonce, WPA_NONCE_LEN);
 903                 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
 904                             sm->snonce, WPA_NONCE_LEN);
 905                 return -1;
 906         }
 907
 908         if (os_memcmp(anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
 909                 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
 910                 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
 911                             anonce, WPA_NONCE_LEN);
 912                 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
 913                             sm->anonce, WPA_NONCE_LEN);
 914                 return -1;
 915         }
 916
 917         if (parse.r0kh_id == NULL) {
 918                 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
 919                 return -1;
 920         }
 921
 922         if (parse.r0kh_id_len != sm->r0kh_id_len ||
 923             os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
 924         {
 925                 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
 926                            "the current R0KH-ID");
 927                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
 928                             parse.r0kh_id, parse.r0kh_id_len);
 929                 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
 930                             sm->r0kh_id, sm->r0kh_id_len);
 931                 return -1;
 932         }
 933
 934         if (parse.r1kh_id == NULL) {
 935                 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
 936                 return -1;
 937         }
 938
 939         if (os_memcmp_const(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
 940                 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
 941                            "ReassocResp");
 942                 return -1;
 943         }
 944
 945         if (parse.rsn_pmkid == NULL ||
 946             os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
 947         {
 948                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
 949                            "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
 950                 return -1;
 951         }
 952
 953         count = 3;
 954         if (parse.ric)
 955                 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
 956         if (fte_elem_count != count) {
 957                 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
 958                            "Control: received %u expected %u",
 959                            fte_elem_count, count);
 960                 return -1;
 961         }
 962
 963         if (wpa_key_mgmt_fils(sm->key_mgmt)) {
 964                 kck = sm->ptk.kck2;
 965                 kck_len = sm->ptk.kck2_len;
 966         } else {
 967                 kck = sm->ptk.kck;
 968                 kck_len = sm->ptk.kck_len;
 969         }
 970
 971         if (wpa_ft_mic(kck, kck_len, sm->own_addr, src_addr, 6,
 972                        parse.mdie - 2, parse.mdie_len + 2,
 973                        parse.ftie - 2, parse.ftie_len + 2,
 974                        parse.rsn - 2, parse.rsn_len + 2,
 975                        parse.ric, parse.ric_len,
 976                        mic) < 0) {
 977                 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
 978                 return -1;
 979         }
 980
 981         if (os_memcmp_const(mic, fte_mic, 16) != 0) {
 982                 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
 983                 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", fte_mic, 16);
 984                 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
 985                 return -1;
 986         }
 987
 988 #ifdef CONFIG_OCV
 989         if (wpa_sm_ocv_enabled(sm)) {
 990                 struct wpa_channel_info ci;
 991
 992                 if (wpa_sm_channel_info(sm, &ci) != 0) {
 993                         wpa_printf(MSG_WARNING,
 994                                    "Failed to get channel info to validate received OCI in (Re)Assoc Response");
 995                         return -1;
 996                 }
 997
 998                 if (ocv_verify_tx_params(parse.oci, parse.oci_len, &ci,
 999                                          channel_width_to_int(ci.chanwidth),
1000                                          ci.seg1_idx) != 0) {
1001                         wpa_printf(MSG_WARNING, "%s", ocv_errorstr);
1002                         return -1;
1003                 }
1004         }
1005 #endif /* CONFIG_OCV */
1006
1007         sm->ft_reassoc_completed = 1;
1008
1009         if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
1010                 return -1;
1011
1012 #ifdef CONFIG_IEEE80211W
1013         if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
1014                 return -1;
1015 #endif /* CONFIG_IEEE80211W */
1016
1017         if (sm->set_ptk_after_assoc) {
1018                 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
1019                            "are associated");
1020                 if (wpa_ft_install_ptk(sm, src_addr) < 0)
1021                         return -1;
1022                 sm->set_ptk_after_assoc = 0;
1023         }
1024
1025         if (parse.ric) {
1026                 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
1027                             parse.ric, parse.ric_len);
1028                 /* TODO: parse response and inform driver about results when
1029                  * using wpa_supplicant SME */
1030         }
1031
1032         wpa_printf(MSG_DEBUG, "FT: Completed successfully");
1033
1034         return 0;
1035 }
1036
1037
1038 /**
1039  * wpa_ft_start_over_ds - Generate over-the-DS auth request
1040  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1041  * @target_ap: Target AP Address
1042  * @mdie: Mobility Domain IE from the target AP
1043  * Returns: 0 on success, -1 on failure
1044  */
1045 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
1046                          const u8 *mdie)
1047 {
1048         u8 *ft_ies;
1049         size_t ft_ies_len;
1050
1051         wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
1052                    MAC2STR(target_ap));
1053
1054         /* Generate a new SNonce */
1055         if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
1056                 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
1057                 return -1;
1058         }
1059
1060         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
1061                                     NULL, 0, target_ap, NULL, 0, mdie);
1062         if (ft_ies) {
1063                 sm->over_the_ds_in_progress = 1;
1064                 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
1065                 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
1066                 os_free(ft_ies);
1067         }
1068
1069         return 0;
1070 }
1071
1072 #endif /* CONFIG_IEEE80211R */