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         sm->ft_reassoc_completed = 0;
 160
 161         buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
 162                 2 + sm->r0kh_id_len + ric_ies_len + 100;
 163         buf = os_zalloc(buf_len);
 164         if (buf == NULL)
 165                 return NULL;
 166         pos = buf;
 167
 168         /* RSNIE[PMKR0Name/PMKR1Name] */
 169         rsnie = (struct rsn_ie_hdr *) pos;
 170         rsnie->elem_id = WLAN_EID_RSN;
 171         WPA_PUT_LE16(rsnie->version, RSN_VERSION);
 172         pos = (u8 *) (rsnie + 1);
 173
 174         /* Group Suite Selector */
 175         if (sm->group_cipher != WPA_CIPHER_CCMP &&
 176             sm->group_cipher != WPA_CIPHER_GCMP &&
 177             sm->group_cipher != WPA_CIPHER_TKIP) {
 178                 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
 179                            sm->group_cipher);
 180                 os_free(buf);
 181                 return NULL;
 182         }
 183         RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
 184                                                   sm->group_cipher));
 185         pos += RSN_SELECTOR_LEN;
 186
 187         /* Pairwise Suite Count */
 188         WPA_PUT_LE16(pos, 1);
 189         pos += 2;
 190
 191         /* Pairwise Suite List */
 192         if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
 193                 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
 194                            sm->pairwise_cipher);
 195                 os_free(buf);
 196                 return NULL;
 197         }
 198         RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
 199                                                   sm->pairwise_cipher));
 200         pos += RSN_SELECTOR_LEN;
 201
 202         /* Authenticated Key Management Suite Count */
 203         WPA_PUT_LE16(pos, 1);
 204         pos += 2;
 205
 206         /* Authenticated Key Management Suite List */
 207         if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
 208                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
 209         else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
 210                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
 211         else {
 212                 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
 213                            sm->key_mgmt);
 214                 os_free(buf);
 215                 return NULL;
 216         }
 217         pos += RSN_SELECTOR_LEN;
 218
 219         /* RSN Capabilities */
 220         capab = 0;
 221 #ifdef CONFIG_IEEE80211W
 222         if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
 223                 capab |= WPA_CAPABILITY_MFPC;
 224 #endif /* CONFIG_IEEE80211W */
 225         WPA_PUT_LE16(pos, capab);
 226         pos += 2;
 227
 228         /* PMKID Count */
 229         WPA_PUT_LE16(pos, 1);
 230         pos += 2;
 231
 232         /* PMKID List [PMKR0Name/PMKR1Name] */
 233         os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
 234         pos += WPA_PMK_NAME_LEN;
 235
 236 #ifdef CONFIG_IEEE80211W
 237         if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
 238                 /* Management Group Cipher Suite */
 239                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
 240                 pos += RSN_SELECTOR_LEN;
 241         }
 242 #endif /* CONFIG_IEEE80211W */
 243
 244         rsnie->len = (pos - (u8 *) rsnie) - 2;
 245
 246         /* MDIE */
 247         *pos++ = WLAN_EID_MOBILITY_DOMAIN;
 248         *pos++ = sizeof(*mdie);
 249         mdie = (struct rsn_mdie *) pos;
 250         pos += sizeof(*mdie);
 251         os_memcpy(mdie->mobility_domain, sm->mobility_domain,
 252                   MOBILITY_DOMAIN_ID_LEN);
 253         mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
 254                 sm->mdie_ft_capab;
 255
 256         /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
 257         ftie_pos = pos;
 258         *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
 259         ftie_len = pos++;
 260         ftie = (struct rsn_ftie *) pos;
 261         pos += sizeof(*ftie);
 262         os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
 263         if (anonce)
 264                 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
 265         if (kck) {
 266                 /* R1KH-ID sub-element in third FT message */
 267                 *pos++ = FTIE_SUBELEM_R1KH_ID;
 268                 *pos++ = FT_R1KH_ID_LEN;
 269                 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
 270                 pos += FT_R1KH_ID_LEN;
 271         }
 272         /* R0KH-ID sub-element */
 273         *pos++ = FTIE_SUBELEM_R0KH_ID;
 274         *pos++ = sm->r0kh_id_len;
 275         os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
 276         pos += sm->r0kh_id_len;
 277         *ftie_len = pos - ftie_len - 1;
 278
 279         if (ric_ies) {
 280                 /* RIC Request */
 281                 os_memcpy(pos, ric_ies, ric_ies_len);
 282                 pos += ric_ies_len;
 283         }
 284
 285         if (kck) {
 286                 /*
 287                  * IEEE Std 802.11r-2008, 11A.8.4
 288                  * MIC shall be calculated over:
 289                  * non-AP STA MAC address
 290                  * Target AP MAC address
 291                  * Transaction seq number (5 for ReassocReq, 3 otherwise)
 292                  * RSN IE
 293                  * MDIE
 294                  * FTIE (with MIC field set to 0)
 295                  * RIC-Request (if present)
 296                  */
 297                 /* Information element count */
 298                 ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies,
 299                                                                ric_ies_len);
 300                 if (wpa_ft_mic(kck, sm->own_addr, target_ap, 5,
 301                                ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
 302                                ftie_pos, 2 + *ftie_len,
 303                                (u8 *) rsnie, 2 + rsnie->len, ric_ies,
 304                                ric_ies_len, ftie->mic) < 0) {
 305                         wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
 306                         os_free(buf);
 307                         return NULL;
 308                 }
 309         }
 310
 311         *len = pos - buf;
 312
 313         return buf;
 314 }
 315
 316
 317 static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
 318 {
 319         int keylen;
 320         enum wpa_alg alg;
 321         u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
 322
 323         wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
 324
 325         if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
 326                 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
 327                            sm->pairwise_cipher);
 328                 return -1;
 329         }
 330
 331         alg = wpa_cipher_to_alg(sm->pairwise_cipher);
 332         keylen = wpa_cipher_key_len(sm->pairwise_cipher);
 333
 334         if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
 335                            sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) {
 336                 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
 337                 return -1;
 338         }
 339
 340         return 0;
 341 }
 342
 343
 344 /**
 345  * wpa_ft_prepare_auth_request - Generate over-the-air auth request
 346  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 347  * @mdie: Target AP MDIE
 348  * Returns: 0 on success, -1 on failure
 349  */
 350 int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
 351 {
 352         u8 *ft_ies;
 353         size_t ft_ies_len;
 354
 355         /* Generate a new SNonce */
 356         if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
 357                 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
 358                 return -1;
 359         }
 360
 361         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
 362                                     NULL, sm->bssid, NULL, 0, mdie);
 363         if (ft_ies) {
 364                 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
 365                                      ft_ies, ft_ies_len);
 366                 os_free(ft_ies);
 367         }
 368
 369         return 0;
 370 }
 371
 372
 373 int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
 374                             int ft_action, const u8 *target_ap,
 375                             const u8 *ric_ies, size_t ric_ies_len)
 376 {
 377         u8 *ft_ies;
 378         size_t ft_ies_len, ptk_len;
 379         struct wpa_ft_ies parse;
 380         struct rsn_mdie *mdie;
 381         struct rsn_ftie *ftie;
 382         u8 ptk_name[WPA_PMK_NAME_LEN];
 383         int ret;
 384         const u8 *bssid;
 385
 386         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
 387         wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
 388
 389         if (ft_action) {
 390                 if (!sm->over_the_ds_in_progress) {
 391                         wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
 392                                    "- drop FT Action Response");
 393                         return -1;
 394                 }
 395
 396                 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
 397                         wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
 398                                    "with this Target AP - drop FT Action "
 399                                    "Response");
 400                         return -1;
 401                 }
 402         }
 403
 404         if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
 405             sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
 406                 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
 407                            "enabled for this connection");
 408                 return -1;
 409         }
 410
 411         if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
 412                 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
 413                 return -1;
 414         }
 415
 416         mdie = (struct rsn_mdie *) parse.mdie;
 417         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 418             os_memcmp(mdie->mobility_domain, sm->mobility_domain,
 419                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 420                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 421                 return -1;
 422         }
 423
 424         ftie = (struct rsn_ftie *) parse.ftie;
 425         if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
 426                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 427                 return -1;
 428         }
 429
 430         if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
 431                 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
 432                 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
 433                             ftie->snonce, WPA_NONCE_LEN);
 434                 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
 435                             sm->snonce, WPA_NONCE_LEN);
 436                 return -1;
 437         }
 438
 439         if (parse.r0kh_id == NULL) {
 440                 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
 441                 return -1;
 442         }
 443
 444         if (parse.r0kh_id_len != sm->r0kh_id_len ||
 445             os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
 446                 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
 447                            "the current R0KH-ID");
 448                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
 449                             parse.r0kh_id, parse.r0kh_id_len);
 450                 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
 451                             sm->r0kh_id, sm->r0kh_id_len);
 452                 return -1;
 453         }
 454
 455         if (parse.r1kh_id == NULL) {
 456                 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
 457                 return -1;
 458         }
 459
 460         if (parse.rsn_pmkid == NULL ||
 461             os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) {
 462                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
 463                            "RSNIE");
 464                 return -1;
 465         }
 466
 467         os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
 468         wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
 469         wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
 470         wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN);
 471         os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN);
 472         wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
 473                           sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
 474         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
 475         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
 476                     sm->pmk_r1_name, WPA_PMK_NAME_LEN);
 477
 478         bssid = target_ap;
 479         ptk_len = sm->pairwise_cipher != WPA_CIPHER_TKIP ? 48 : 64;
 480         wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr,
 481                           bssid, sm->pmk_r1_name,
 482                           (u8 *) &sm->ptk, ptk_len, ptk_name);
 483         wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
 484                         (u8 *) &sm->ptk, ptk_len);
 485         wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
 486
 487         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
 488                                     sm->pmk_r1_name, sm->ptk.kck, bssid,
 489                                     ric_ies, ric_ies_len,
 490                                     parse.mdie ? parse.mdie - 2 : NULL);
 491         if (ft_ies) {
 492                 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
 493                                      ft_ies, ft_ies_len);
 494                 os_free(ft_ies);
 495         }
 496
 497         wpa_sm_mark_authenticated(sm, bssid);
 498         ret = wpa_ft_install_ptk(sm, bssid);
 499         if (ret) {
 500                 /*
 501                  * Some drivers do not support key configuration when we are
 502                  * not associated with the target AP. Work around this by
 503                  * trying again after the following reassociation gets
 504                  * completed.
 505                  */
 506                 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
 507                            "association - try again after reassociation");
 508                 sm->set_ptk_after_assoc = 1;
 509         } else
 510                 sm->set_ptk_after_assoc = 0;
 511
 512         sm->ft_completed = 1;
 513         if (ft_action) {
 514                 /*
 515                  * The caller is expected trigger re-association with the
 516                  * Target AP.
 517                  */
 518                 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
 519         }
 520
 521         return 0;
 522 }
 523
 524
 525 int wpa_ft_is_completed(struct wpa_sm *sm)
 526 {
 527         if (sm == NULL)
 528                 return 0;
 529
 530         if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
 531             sm->key_mgmt != WPA_KEY_MGMT_FT_PSK)
 532                 return 0;
 533
 534         return sm->ft_completed;
 535 }
 536
 537
 538 static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
 539                                       size_t gtk_elem_len)
 540 {
 541         u8 gtk[32];
 542         int keyidx;
 543         enum wpa_alg alg;
 544         size_t gtk_len, keylen, rsc_len;
 545
 546         if (gtk_elem == NULL) {
 547                 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
 548                 return 0;
 549         }
 550
 551         wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
 552                         gtk_elem, gtk_elem_len);
 553
 554         if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
 555             gtk_elem_len - 19 > sizeof(gtk)) {
 556                 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
 557                            "length %lu", (unsigned long) gtk_elem_len);
 558                 return -1;
 559         }
 560         gtk_len = gtk_elem_len - 19;
 561         if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 11, gtk)) {
 562                 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
 563                            "decrypt GTK");
 564                 return -1;
 565         }
 566
 567         keylen = wpa_cipher_key_len(sm->group_cipher);
 568         rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
 569         alg = wpa_cipher_to_alg(sm->group_cipher);
 570         if (alg == WPA_ALG_NONE) {
 571                 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
 572                            sm->group_cipher);
 573                 return -1;
 574         }
 575
 576         if (gtk_len < keylen) {
 577                 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
 578                 return -1;
 579         }
 580
 581         /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
 582
 583         keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
 584
 585         if (gtk_elem[2] != keylen) {
 586                 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
 587                            "negotiated %lu",
 588                            gtk_elem[2], (unsigned long) keylen);
 589                 return -1;
 590         }
 591
 592         wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
 593         if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0,
 594                            gtk_elem + 3, rsc_len, gtk, keylen) < 0) {
 595                 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
 596                            "driver.");
 597                 return -1;
 598         }
 599
 600         return 0;
 601 }
 602
 603
 604 #ifdef CONFIG_IEEE80211W
 605 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
 606                                        size_t igtk_elem_len)
 607 {
 608         u8 igtk[WPA_IGTK_LEN];
 609         u16 keyidx;
 610
 611         if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
 612                 return 0;
 613
 614         if (igtk_elem == NULL) {
 615                 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
 616                 return 0;
 617         }
 618
 619         wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
 620                         igtk_elem, igtk_elem_len);
 621
 622         if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
 623                 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
 624                            "length %lu", (unsigned long) igtk_elem_len);
 625                 return -1;
 626         }
 627         if (igtk_elem[8] != WPA_IGTK_LEN) {
 628                 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
 629                            "%d", igtk_elem[8]);
 630                 return -1;
 631         }
 632
 633         if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) {
 634                 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
 635                            "decrypt IGTK");
 636                 return -1;
 637         }
 638
 639         /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
 640
 641         keyidx = WPA_GET_LE16(igtk_elem);
 642
 643         wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
 644                         WPA_IGTK_LEN);
 645         if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0,
 646                            igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) {
 647                 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
 648                            "driver.");
 649                 return -1;
 650         }
 651
 652         return 0;
 653 }
 654 #endif /* CONFIG_IEEE80211W */
 655
 656
 657 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
 658                                  size_t ies_len, const u8 *src_addr)
 659 {
 660         struct wpa_ft_ies parse;
 661         struct rsn_mdie *mdie;
 662         struct rsn_ftie *ftie;
 663         unsigned int count;
 664         u8 mic[16];
 665
 666         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
 667
 668         if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
 669             sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
 670                 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
 671                            "enabled for this connection");
 672                 return -1;
 673         }
 674
 675         if (sm->ft_reassoc_completed) {
 676                 wpa_printf(MSG_DEBUG, "FT: Reassociation has already been completed for this FT protocol instance - ignore unexpected retransmission");
 677                 return 0;
 678         }
 679
 680         if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
 681                 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
 682                 return -1;
 683         }
 684
 685         mdie = (struct rsn_mdie *) parse.mdie;
 686         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 687             os_memcmp(mdie->mobility_domain, sm->mobility_domain,
 688                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 689                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 690                 return -1;
 691         }
 692
 693         ftie = (struct rsn_ftie *) parse.ftie;
 694         if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
 695                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 696                 return -1;
 697         }
 698
 699         if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
 700                 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
 701                 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
 702                             ftie->snonce, WPA_NONCE_LEN);
 703                 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
 704                             sm->snonce, WPA_NONCE_LEN);
 705                 return -1;
 706         }
 707
 708         if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
 709                 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
 710                 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
 711                             ftie->anonce, WPA_NONCE_LEN);
 712                 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
 713                             sm->anonce, WPA_NONCE_LEN);
 714                 return -1;
 715         }
 716
 717         if (parse.r0kh_id == NULL) {
 718                 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
 719                 return -1;
 720         }
 721
 722         if (parse.r0kh_id_len != sm->r0kh_id_len ||
 723             os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
 724                 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
 725                            "the current R0KH-ID");
 726                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
 727                             parse.r0kh_id, parse.r0kh_id_len);
 728                 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
 729                             sm->r0kh_id, sm->r0kh_id_len);
 730                 return -1;
 731         }
 732
 733         if (parse.r1kh_id == NULL) {
 734                 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
 735                 return -1;
 736         }
 737
 738         if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
 739                 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
 740                            "ReassocResp");
 741                 return -1;
 742         }
 743
 744         if (parse.rsn_pmkid == NULL ||
 745             os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) {
 746                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
 747                            "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
 748                 return -1;
 749         }
 750
 751         count = 3;
 752         if (parse.ric)
 753                 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
 754         if (ftie->mic_control[1] != count) {
 755                 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
 756                            "Control: received %u expected %u",
 757                            ftie->mic_control[1], count);
 758                 return -1;
 759         }
 760
 761         if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6,
 762                        parse.mdie - 2, parse.mdie_len + 2,
 763                        parse.ftie - 2, parse.ftie_len + 2,
 764                        parse.rsn - 2, parse.rsn_len + 2,
 765                        parse.ric, parse.ric_len,
 766                        mic) < 0) {
 767                 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
 768                 return -1;
 769         }
 770
 771         if (os_memcmp(mic, ftie->mic, 16) != 0) {
 772                 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
 773                 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
 774                 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
 775                 return -1;
 776         }
 777
 778         sm->ft_reassoc_completed = 1;
 779
 780         if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
 781                 return -1;
 782
 783 #ifdef CONFIG_IEEE80211W
 784         if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
 785                 return -1;
 786 #endif /* CONFIG_IEEE80211W */
 787
 788         if (sm->set_ptk_after_assoc) {
 789                 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
 790                            "are associated");
 791                 if (wpa_ft_install_ptk(sm, src_addr) < 0)
 792                         return -1;
 793                 sm->set_ptk_after_assoc = 0;
 794         }
 795
 796         if (parse.ric) {
 797                 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
 798                             parse.ric, parse.ric_len);
 799                 /* TODO: parse response and inform driver about results */
 800         }
 801
 802         return 0;
 803 }
 804
 805
 806 /**
 807  * wpa_ft_start_over_ds - Generate over-the-DS auth request
 808  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 809  * @target_ap: Target AP Address
 810  * @mdie: Mobility Domain IE from the target AP
 811  * Returns: 0 on success, -1 on failure
 812  */
 813 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
 814                          const u8 *mdie)
 815 {
 816         u8 *ft_ies;
 817         size_t ft_ies_len;
 818
 819         wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
 820                    MAC2STR(target_ap));
 821
 822         /* Generate a new SNonce */
 823         if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
 824                 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
 825                 return -1;
 826         }
 827
 828         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
 829                                     NULL, target_ap, NULL, 0, mdie);
 830         if (ft_ies) {
 831                 sm->over_the_ds_in_progress = 1;
 832                 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
 833                 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
 834                 os_free(ft_ies);
 835         }
 836
 837         return 0;
 838 }
 839
 840 #endif /* CONFIG_IEEE80211R */