libeap/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 (!wpa_cipher_valid_group(sm->group_cipher)) {
 172                 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
 173                            sm->group_cipher);
 174                 os_free(buf);
 175                 return NULL;
 176         }
 177         RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
 178                                                   sm->group_cipher));
 179         pos += RSN_SELECTOR_LEN;
 180
 181         /* Pairwise Suite Count */
 182         WPA_PUT_LE16(pos, 1);
 183         pos += 2;
 184
 185         /* Pairwise Suite List */
 186         if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
 187                 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
 188                            sm->pairwise_cipher);
 189                 os_free(buf);
 190                 return NULL;
 191         }
 192         RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
 193                                                   sm->pairwise_cipher));
 194         pos += RSN_SELECTOR_LEN;
 195
 196         /* Authenticated Key Management Suite Count */
 197         WPA_PUT_LE16(pos, 1);
 198         pos += 2;
 199
 200         /* Authenticated Key Management Suite List */
 201         if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
 202                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
 203         else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
 204                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
 205         else if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE)
 206                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
 207         else {
 208                 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
 209                            sm->key_mgmt);
 210                 os_free(buf);
 211                 return NULL;
 212         }
 213         pos += RSN_SELECTOR_LEN;
 214
 215         /* RSN Capabilities */
 216         capab = 0;
 217 #ifdef CONFIG_IEEE80211W
 218         if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
 219                 capab |= WPA_CAPABILITY_MFPC;
 220 #endif /* CONFIG_IEEE80211W */
 221         WPA_PUT_LE16(pos, capab);
 222         pos += 2;
 223
 224         /* PMKID Count */
 225         WPA_PUT_LE16(pos, 1);
 226         pos += 2;
 227
 228         /* PMKID List [PMKR0Name/PMKR1Name] */
 229         os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
 230         pos += WPA_PMK_NAME_LEN;
 231
 232 #ifdef CONFIG_IEEE80211W
 233         if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
 234                 /* Management Group Cipher Suite */
 235                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
 236                 pos += RSN_SELECTOR_LEN;
 237         }
 238 #endif /* CONFIG_IEEE80211W */
 239
 240         rsnie->len = (pos - (u8 *) rsnie) - 2;
 241
 242         /* MDIE */
 243         *pos++ = WLAN_EID_MOBILITY_DOMAIN;
 244         *pos++ = sizeof(*mdie);
 245         mdie = (struct rsn_mdie *) pos;
 246         pos += sizeof(*mdie);
 247         os_memcpy(mdie->mobility_domain, sm->mobility_domain,
 248                   MOBILITY_DOMAIN_ID_LEN);
 249         mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
 250                 sm->mdie_ft_capab;
 251
 252         /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
 253         ftie_pos = pos;
 254         *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
 255         ftie_len = pos++;
 256         ftie = (struct rsn_ftie *) pos;
 257         pos += sizeof(*ftie);
 258         os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
 259         if (anonce)
 260                 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
 261         if (kck) {
 262                 /* R1KH-ID sub-element in third FT message */
 263                 *pos++ = FTIE_SUBELEM_R1KH_ID;
 264                 *pos++ = FT_R1KH_ID_LEN;
 265                 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
 266                 pos += FT_R1KH_ID_LEN;
 267         }
 268         /* R0KH-ID sub-element */
 269         *pos++ = FTIE_SUBELEM_R0KH_ID;
 270         *pos++ = sm->r0kh_id_len;
 271         os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
 272         pos += sm->r0kh_id_len;
 273         *ftie_len = pos - ftie_len - 1;
 274
 275         if (ric_ies) {
 276                 /* RIC Request */
 277                 os_memcpy(pos, ric_ies, ric_ies_len);
 278                 pos += ric_ies_len;
 279         }
 280
 281         if (kck) {
 282                 /*
 283                  * IEEE Std 802.11r-2008, 11A.8.4
 284                  * MIC shall be calculated over:
 285                  * non-AP STA MAC address
 286                  * Target AP MAC address
 287                  * Transaction seq number (5 for ReassocReq, 3 otherwise)
 288                  * RSN IE
 289                  * MDIE
 290                  * FTIE (with MIC field set to 0)
 291                  * RIC-Request (if present)
 292                  */
 293                 /* Information element count */
 294                 ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies,
 295                                                                ric_ies_len);
 296                 if (wpa_ft_mic(kck, kck_len, sm->own_addr, target_ap, 5,
 297                                ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
 298                                ftie_pos, 2 + *ftie_len,
 299                                (u8 *) rsnie, 2 + rsnie->len, ric_ies,
 300                                ric_ies_len, ftie->mic) < 0) {
 301                         wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
 302                         os_free(buf);
 303                         return NULL;
 304                 }
 305         }
 306
 307         *len = pos - buf;
 308
 309         return buf;
 310 }
 311
 312
 313 static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
 314 {
 315         int keylen;
 316         enum wpa_alg alg;
 317         u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
 318
 319         wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
 320
 321         if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
 322                 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
 323                            sm->pairwise_cipher);
 324                 return -1;
 325         }
 326
 327         alg = wpa_cipher_to_alg(sm->pairwise_cipher);
 328         keylen = wpa_cipher_key_len(sm->pairwise_cipher);
 329
 330         if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
 331                            sizeof(null_rsc), (u8 *) sm->ptk.tk, keylen) < 0) {
 332                 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
 333                 return -1;
 334         }
 335
 336         return 0;
 337 }
 338
 339
 340 /**
 341  * wpa_ft_prepare_auth_request - Generate over-the-air auth request
 342  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 343  * @mdie: Target AP MDIE
 344  * Returns: 0 on success, -1 on failure
 345  */
 346 int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
 347 {
 348         u8 *ft_ies;
 349         size_t ft_ies_len;
 350
 351         /* Generate a new SNonce */
 352         if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
 353                 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
 354                 return -1;
 355         }
 356
 357         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
 358                                     NULL, 0, sm->bssid, NULL, 0, mdie);
 359         if (ft_ies) {
 360                 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
 361                                      ft_ies, ft_ies_len);
 362                 os_free(ft_ies);
 363         }
 364
 365         return 0;
 366 }
 367
 368
 369 int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
 370                             int ft_action, const u8 *target_ap,
 371                             const u8 *ric_ies, size_t ric_ies_len)
 372 {
 373         u8 *ft_ies;
 374         size_t ft_ies_len;
 375         struct wpa_ft_ies parse;
 376         struct rsn_mdie *mdie;
 377         struct rsn_ftie *ftie;
 378         u8 ptk_name[WPA_PMK_NAME_LEN];
 379         int ret;
 380         const u8 *bssid;
 381
 382         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
 383         wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
 384
 385         if (ft_action) {
 386                 if (!sm->over_the_ds_in_progress) {
 387                         wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
 388                                    "- drop FT Action Response");
 389                         return -1;
 390                 }
 391
 392                 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
 393                         wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
 394                                    "with this Target AP - drop FT Action "
 395                                    "Response");
 396                         return -1;
 397                 }
 398         }
 399
 400         if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
 401                 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
 402                            "enabled for this connection");
 403                 return -1;
 404         }
 405
 406         if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
 407                 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
 408                 return -1;
 409         }
 410
 411         mdie = (struct rsn_mdie *) parse.mdie;
 412         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 413             os_memcmp(mdie->mobility_domain, sm->mobility_domain,
 414                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 415                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 416                 return -1;
 417         }
 418
 419         ftie = (struct rsn_ftie *) parse.ftie;
 420         if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
 421                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 422                 return -1;
 423         }
 424
 425         if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
 426                 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
 427                 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
 428                             ftie->snonce, WPA_NONCE_LEN);
 429                 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
 430                             sm->snonce, WPA_NONCE_LEN);
 431                 return -1;
 432         }
 433
 434         if (parse.r0kh_id == NULL) {
 435                 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
 436                 return -1;
 437         }
 438
 439         if (parse.r0kh_id_len != sm->r0kh_id_len ||
 440             os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
 441         {
 442                 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
 443                            "the current R0KH-ID");
 444                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
 445                             parse.r0kh_id, parse.r0kh_id_len);
 446                 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
 447                             sm->r0kh_id, sm->r0kh_id_len);
 448                 return -1;
 449         }
 450
 451         if (parse.r1kh_id == NULL) {
 452                 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
 453                 return -1;
 454         }
 455
 456         if (parse.rsn_pmkid == NULL ||
 457             os_memcmp_const(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN))
 458         {
 459                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
 460                            "RSNIE");
 461                 return -1;
 462         }
 463
 464         os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
 465         wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
 466         wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
 467         wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN);
 468         os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN);
 469         wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
 470                           sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
 471         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
 472         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
 473                     sm->pmk_r1_name, WPA_PMK_NAME_LEN);
 474
 475         bssid = target_ap;
 476         if (wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce,
 477                               sm->own_addr, bssid, sm->pmk_r1_name, &sm->ptk,
 478                               ptk_name, sm->key_mgmt, sm->pairwise_cipher) < 0)
 479                 return -1;
 480
 481         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
 482                                     sm->pmk_r1_name,
 483                                     sm->ptk.kck, sm->ptk.kck_len, bssid,
 484                                     ric_ies, ric_ies_len,
 485                                     parse.mdie ? parse.mdie - 2 : NULL);
 486         if (ft_ies) {
 487                 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
 488                                      ft_ies, ft_ies_len);
 489                 os_free(ft_ies);
 490         }
 491
 492         wpa_sm_mark_authenticated(sm, bssid);
 493         ret = wpa_ft_install_ptk(sm, bssid);
 494         if (ret) {
 495                 /*
 496                  * Some drivers do not support key configuration when we are
 497                  * not associated with the target AP. Work around this by
 498                  * trying again after the following reassociation gets
 499                  * completed.
 500                  */
 501                 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
 502                            "association - try again after reassociation");
 503                 sm->set_ptk_after_assoc = 1;
 504         } else
 505                 sm->set_ptk_after_assoc = 0;
 506
 507         sm->ft_completed = 1;
 508         if (ft_action) {
 509                 /*
 510                  * The caller is expected trigger re-association with the
 511                  * Target AP.
 512                  */
 513                 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
 514         }
 515
 516         return 0;
 517 }
 518
 519
 520 int wpa_ft_is_completed(struct wpa_sm *sm)
 521 {
 522         if (sm == NULL)
 523                 return 0;
 524
 525         if (!wpa_key_mgmt_ft(sm->key_mgmt))
 526                 return 0;
 527
 528         return sm->ft_completed;
 529 }
 530
 531
 532 void wpa_reset_ft_completed(struct wpa_sm *sm)
 533 {
 534         if (sm != NULL)
 535                 sm->ft_completed = 0;
 536 }
 537
 538
 539 static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
 540                                       size_t gtk_elem_len)
 541 {
 542         u8 gtk[32];
 543         int keyidx;
 544         enum wpa_alg alg;
 545         size_t gtk_len, keylen, rsc_len;
 546
 547         if (gtk_elem == NULL) {
 548                 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
 549                 return 0;
 550         }
 551
 552         wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
 553                         gtk_elem, gtk_elem_len);
 554
 555         if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
 556             gtk_elem_len - 19 > sizeof(gtk)) {
 557                 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
 558                            "length %lu", (unsigned long) gtk_elem_len);
 559                 return -1;
 560         }
 561         gtk_len = gtk_elem_len - 19;
 562         if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, gtk_len / 8, gtk_elem + 11,
 563                        gtk)) {
 564                 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
 565                            "decrypt GTK");
 566                 return -1;
 567         }
 568
 569         keylen = wpa_cipher_key_len(sm->group_cipher);
 570         rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
 571         alg = wpa_cipher_to_alg(sm->group_cipher);
 572         if (alg == WPA_ALG_NONE) {
 573                 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
 574                            sm->group_cipher);
 575                 return -1;
 576         }
 577
 578         if (gtk_len < keylen) {
 579                 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
 580                 return -1;
 581         }
 582
 583         /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
 584
 585         keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
 586
 587         if (gtk_elem[2] != keylen) {
 588                 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
 589                            "negotiated %lu",
 590                            gtk_elem[2], (unsigned long) keylen);
 591                 return -1;
 592         }
 593
 594         wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
 595         if (sm->group_cipher == WPA_CIPHER_TKIP) {
 596                 /* Swap Tx/Rx keys for Michael MIC */
 597                 u8 tmp[8];
 598                 os_memcpy(tmp, gtk + 16, 8);
 599                 os_memcpy(gtk + 16, gtk + 24, 8);
 600                 os_memcpy(gtk + 24, tmp, 8);
 601         }
 602         if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0,
 603                            gtk_elem + 3, rsc_len, gtk, keylen) < 0) {
 604                 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
 605                            "driver.");
 606                 return -1;
 607         }
 608
 609         return 0;
 610 }
 611
 612
 613 #ifdef CONFIG_IEEE80211W
 614 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
 615                                        size_t igtk_elem_len)
 616 {
 617         u8 igtk[WPA_IGTK_LEN];
 618         u16 keyidx;
 619
 620         if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
 621                 return 0;
 622
 623         if (igtk_elem == NULL) {
 624                 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
 625                 return 0;
 626         }
 627
 628         wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
 629                         igtk_elem, igtk_elem_len);
 630
 631         if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
 632                 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
 633                            "length %lu", (unsigned long) igtk_elem_len);
 634                 return -1;
 635         }
 636         if (igtk_elem[8] != WPA_IGTK_LEN) {
 637                 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
 638                            "%d", igtk_elem[8]);
 639                 return -1;
 640         }
 641
 642         if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, WPA_IGTK_LEN / 8,
 643                        igtk_elem + 9, igtk)) {
 644                 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
 645                            "decrypt IGTK");
 646                 return -1;
 647         }
 648
 649         /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
 650
 651         keyidx = WPA_GET_LE16(igtk_elem);
 652
 653         wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
 654                         WPA_IGTK_LEN);
 655         if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0,
 656                            igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) {
 657                 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
 658                            "driver.");
 659                 return -1;
 660         }
 661
 662         return 0;
 663 }
 664 #endif /* CONFIG_IEEE80211W */
 665
 666
 667 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
 668                                  size_t ies_len, const u8 *src_addr)
 669 {
 670         struct wpa_ft_ies parse;
 671         struct rsn_mdie *mdie;
 672         struct rsn_ftie *ftie;
 673         unsigned int count;
 674         u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
 675
 676         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
 677
 678         if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
 679                 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
 680                            "enabled for this connection");
 681                 return -1;
 682         }
 683
 684         if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
 685                 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
 686                 return -1;
 687         }
 688
 689         mdie = (struct rsn_mdie *) parse.mdie;
 690         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 691             os_memcmp(mdie->mobility_domain, sm->mobility_domain,
 692                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 693                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 694                 return -1;
 695         }
 696
 697         ftie = (struct rsn_ftie *) parse.ftie;
 698         if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
 699                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 700                 return -1;
 701         }
 702
 703         if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
 704                 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
 705                 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
 706                             ftie->snonce, WPA_NONCE_LEN);
 707                 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
 708                             sm->snonce, WPA_NONCE_LEN);
 709                 return -1;
 710         }
 711
 712         if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
 713                 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
 714                 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
 715                             ftie->anonce, WPA_NONCE_LEN);
 716                 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
 717                             sm->anonce, WPA_NONCE_LEN);
 718                 return -1;
 719         }
 720
 721         if (parse.r0kh_id == NULL) {
 722                 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
 723                 return -1;
 724         }
 725
 726         if (parse.r0kh_id_len != sm->r0kh_id_len ||
 727             os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
 728         {
 729                 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
 730                            "the current R0KH-ID");
 731                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
 732                             parse.r0kh_id, parse.r0kh_id_len);
 733                 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
 734                             sm->r0kh_id, sm->r0kh_id_len);
 735                 return -1;
 736         }
 737
 738         if (parse.r1kh_id == NULL) {
 739                 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
 740                 return -1;
 741         }
 742
 743         if (os_memcmp_const(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
 744                 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
 745                            "ReassocResp");
 746                 return -1;
 747         }
 748
 749         if (parse.rsn_pmkid == NULL ||
 750             os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
 751         {
 752                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
 753                            "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
 754                 return -1;
 755         }
 756
 757         count = 3;
 758         if (parse.ric)
 759                 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
 760         if (ftie->mic_control[1] != count) {
 761                 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
 762                            "Control: received %u expected %u",
 763                            ftie->mic_control[1], count);
 764                 return -1;
 765         }
 766
 767         if (wpa_ft_mic(sm->ptk.kck, sm->ptk.kck_len, sm->own_addr, src_addr, 6,
 768                        parse.mdie - 2, parse.mdie_len + 2,
 769                        parse.ftie - 2, parse.ftie_len + 2,
 770                        parse.rsn - 2, parse.rsn_len + 2,
 771                        parse.ric, parse.ric_len,
 772                        mic) < 0) {
 773                 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
 774                 return -1;
 775         }
 776
 777         if (os_memcmp_const(mic, ftie->mic, 16) != 0) {
 778                 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
 779                 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
 780                 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
 781                 return -1;
 782         }
 783
 784         if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
 785                 return -1;
 786
 787 #ifdef CONFIG_IEEE80211W
 788         if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
 789                 return -1;
 790 #endif /* CONFIG_IEEE80211W */
 791
 792         if (sm->set_ptk_after_assoc) {
 793                 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
 794                            "are associated");
 795                 if (wpa_ft_install_ptk(sm, src_addr) < 0)
 796                         return -1;
 797                 sm->set_ptk_after_assoc = 0;
 798         }
 799
 800         if (parse.ric) {
 801                 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
 802                             parse.ric, parse.ric_len);
 803                 /* TODO: parse response and inform driver about results when
 804                  * using wpa_supplicant SME */
 805         }
 806
 807         wpa_printf(MSG_DEBUG, "FT: Completed successfully");
 808
 809         return 0;
 810 }
 811
 812
 813 /**
 814  * wpa_ft_start_over_ds - Generate over-the-DS auth request
 815  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 816  * @target_ap: Target AP Address
 817  * @mdie: Mobility Domain IE from the target AP
 818  * Returns: 0 on success, -1 on failure
 819  */
 820 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
 821                          const u8 *mdie)
 822 {
 823         u8 *ft_ies;
 824         size_t ft_ies_len;
 825
 826         wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
 827                    MAC2STR(target_ap));
 828
 829         /* Generate a new SNonce */
 830         if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
 831                 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
 832                 return -1;
 833         }
 834
 835         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
 836                                     NULL, 0, target_ap, NULL, 0, mdie);
 837         if (ft_ies) {
 838                 sm->over_the_ds_in_progress = 1;
 839                 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
 840                 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
 841                 os_free(ft_ies);
 842         }
 843
 844         return 0;
 845 }
 846
 847 #endif /* CONFIG_IEEE80211R */