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 program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "wpa.h"
  19 #include "wpa_i.h"
  20 #include "wpa_ie.h"
  21 #include "aes_wrap.h"
  22 #include "ieee802_11_defs.h"
  23
  24 #ifdef CONFIG_IEEE80211R
  25
  26 int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr,
  27                       const struct wpa_eapol_key *key,
  28                       struct wpa_ptk *ptk)
  29 {
  30         u8 pmk_r1_name[WPA_PMK_NAME_LEN];
  31         u8 ptk_name[WPA_PMK_NAME_LEN];
  32         const u8 *anonce = key->key_nonce;
  33
  34         if (sm->xxkey_len == 0) {
  35                 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
  36                            "derivation");
  37                 return -1;
  38         }
  39
  40         wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid,
  41                           sm->ssid_len, sm->mobility_domain,
  42                           sm->r0kh_id, sm->r0kh_id_len, sm->own_addr,
  43                           sm->pmk_r0, sm->pmk_r0_name);
  44         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, PMK_LEN);
  45         wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name",
  46                     sm->pmk_r0_name, WPA_PMK_NAME_LEN);
  47         wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
  48                           sm->own_addr, sm->pmk_r1, pmk_r1_name);
  49         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
  50         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", pmk_r1_name, WPA_PMK_NAME_LEN);
  51         wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr,
  52                           sm->bssid, pmk_r1_name,
  53                           (u8 *) ptk, sizeof(*ptk), ptk_name);
  54         wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, sizeof(*ptk));
  55         wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
  56
  57         return 0;
  58 }
  59
  60
  61 /**
  62  * wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters
  63  * @sm: Pointer to WPA state machine data from wpa_sm_init()
  64  * @mobility_domain: Mobility domain identifier (2 octets)
  65  * @r0kh_id: PMK-R0 key holder identity (1-48 octets)
  66  * @r0kh_id_len: R0KH-ID length (1-48)
  67  * @r1kh_id: PMK-R1 key holder identity (16 octets)
  68  * Returns: 0 on success, -1 on failure
  69  */
  70 int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *mobility_domain,
  71                          const u8 *r0kh_id, size_t r0kh_id_len,
  72                          const u8 *r1kh_id)
  73 {
  74         if (sm && mobility_domain) {
  75                 wpa_hexdump(MSG_DEBUG, "FT: Mobility domain",
  76                             mobility_domain, MOBILITY_DOMAIN_ID_LEN);
  77                 os_memcpy(sm->mobility_domain, mobility_domain,
  78                           MOBILITY_DOMAIN_ID_LEN);
  79         } else if (sm)
  80                 os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);
  81
  82         if (sm && r0kh_id) {
  83                 if (r0kh_id_len > FT_R0KH_ID_MAX_LEN)
  84                         return -1;
  85                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", r0kh_id, r0kh_id_len);
  86                 os_memcpy(sm->r0kh_id, r0kh_id, r0kh_id_len);
  87                 sm->r0kh_id_len = r0kh_id_len;
  88         } else if (sm) {
  89                 /* FIX: When should R0KH-ID be cleared? We need to keep the
  90                  * old R0KH-ID in order to be able to use this during FT. */
  91                 /*
  92                  * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN);
  93                  * sm->r0kh_id_len = 0;
  94                  */
  95         }
  96
  97         if (sm && r1kh_id) {
  98                 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", r1kh_id, FT_R1KH_ID_LEN);
  99                 os_memcpy(sm->r1kh_id, r1kh_id, FT_R1KH_ID_LEN);
 100         } else if (sm)
 101                 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
 102
 103         return 0;
 104 }
 105
 106
 107 /**
 108  * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth Request
 109  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 110  * @len: Buffer for returning the length of the IEs
 111  * @anonce: ANonce or %NULL if not yet available
 112  * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List
 113  * @kck: 128-bit KCK for MIC or %NULL if no MIC is used
 114  * @target_ap: Target AP address
 115  * Returns: Pointer to buffer with IEs or %NULL on failure
 116  *
 117  * Caller is responsible for freeing the returned buffer with os_free();
 118  */
 119 static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
 120                                const u8 *anonce, const u8 *pmk_name,
 121                                const u8 *kck, const u8 *target_ap)
 122 {
 123         size_t buf_len;
 124         u8 *buf, *pos, *ftie_len;
 125         struct rsn_mdie *mdie;
 126         struct rsn_ftie *ftie;
 127         struct rsn_ie_hdr *rsnie;
 128         u16 capab;
 129
 130         sm->ft_completed = 0;
 131
 132         buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
 133                 2 + sm->r0kh_id_len + 100;
 134         buf = os_zalloc(buf_len);
 135         if (buf == NULL)
 136                 return NULL;
 137         pos = buf;
 138
 139         /* RSNIE[PMKR0Name] */
 140         rsnie = (struct rsn_ie_hdr *) pos;
 141         rsnie->elem_id = WLAN_EID_RSN;
 142         WPA_PUT_LE16(rsnie->version, RSN_VERSION);
 143         pos = (u8 *) (rsnie + 1);
 144
 145         /* Group Suite Selector */
 146         if (sm->group_cipher == WPA_CIPHER_CCMP)
 147                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
 148         else if (sm->group_cipher == WPA_CIPHER_TKIP)
 149                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
 150         else {
 151                 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
 152                            sm->group_cipher);
 153                 os_free(buf);
 154                 return NULL;
 155         }
 156         pos += RSN_SELECTOR_LEN;
 157
 158         /* Pairwise Suite Count */
 159         WPA_PUT_LE16(pos, 1);
 160         pos += 2;
 161
 162         /* Pairwise Suite List */
 163         if (sm->pairwise_cipher == WPA_CIPHER_CCMP)
 164                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
 165         else if (sm->pairwise_cipher == WPA_CIPHER_TKIP)
 166                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
 167         else {
 168                 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
 169                            sm->pairwise_cipher);
 170                 os_free(buf);
 171                 return NULL;
 172         }
 173         pos += RSN_SELECTOR_LEN;
 174
 175         /* Authenticated Key Management Suite Count */
 176         WPA_PUT_LE16(pos, 1);
 177         pos += 2;
 178
 179         /* Authenticated Key Management Suite List */
 180         if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
 181                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
 182         else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
 183                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
 184         else {
 185                 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
 186                            sm->key_mgmt);
 187                 os_free(buf);
 188                 return NULL;
 189         }
 190         pos += RSN_SELECTOR_LEN;
 191
 192         /* RSN Capabilities */
 193         capab = 0;
 194 #ifdef CONFIG_IEEE80211W
 195         if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
 196                 capab |= WPA_CAPABILITY_MGMT_FRAME_PROTECTION;
 197 #endif /* CONFIG_IEEE80211W */
 198         WPA_PUT_LE16(pos, capab);
 199         pos += 2;
 200
 201         /* PMKID Count */
 202         WPA_PUT_LE16(pos, 1);
 203         pos += 2;
 204
 205         /* PMKID List [PMKR0Name/PMKR1Name] */
 206         os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
 207         pos += WPA_PMK_NAME_LEN;
 208
 209 #ifdef CONFIG_IEEE80211W
 210         if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
 211                 /* Management Group Cipher Suite */
 212                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
 213                 pos += RSN_SELECTOR_LEN;
 214         }
 215 #endif /* CONFIG_IEEE80211W */
 216
 217         rsnie->len = (pos - (u8 *) rsnie) - 2;
 218
 219         /* MDIE */
 220         *pos++ = WLAN_EID_MOBILITY_DOMAIN;
 221         *pos++ = sizeof(*mdie);
 222         mdie = (struct rsn_mdie *) pos;
 223         pos += sizeof(*mdie);
 224         os_memcpy(mdie->mobility_domain, sm->mobility_domain,
 225                   MOBILITY_DOMAIN_ID_LEN);
 226         mdie->ft_capab = 0; /* FIX: copy from the target AP's MDIE */
 227
 228         /* FTIE[SNonce, R0KH-ID] */
 229         *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
 230         ftie_len = pos++;
 231         ftie = (struct rsn_ftie *) pos;
 232         pos += sizeof(*ftie);
 233         os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
 234         if (anonce)
 235                 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
 236         /* R0KH-ID sub-element */
 237         *pos++ = FTIE_SUBELEM_R0KH_ID;
 238         *pos++ = sm->r0kh_id_len;
 239         os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
 240         pos += sm->r0kh_id_len;
 241         *ftie_len = pos - ftie_len - 1;
 242
 243         if (kck) {
 244                 /*
 245                  * IEEE 802.11r/D9.0, 11A.8.4
 246                  * MIC shall be calculated over:
 247                  * non-AP STA MAC address
 248                  * Target AP MAC address
 249                  * Transaction seq number (5 for ReassocReq, 3 otherwise)
 250                  * RSN IE
 251                  * MDIE
 252                  * FTIE (with MIC field set to 0)
 253                  * RIC-Request (if present)
 254                  */
 255                 ftie->mic_control[1] = 3; /* Information element count */
 256                 if (wpa_ft_mic(kck, sm->own_addr, target_ap, 5,
 257                                ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
 258                                ((u8 *) ftie) - 2, 2 + *ftie_len,
 259                                (u8 *) rsnie, 2 + rsnie->len, NULL, 0,
 260                                ftie->mic) < 0) {
 261                         wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
 262                         os_free(buf);
 263                         return NULL;
 264                 }
 265         }
 266
 267         *len = pos - buf;
 268
 269         return buf;
 270 }
 271
 272
 273 struct wpa_ft_ies {
 274         const u8 *mdie;
 275         size_t mdie_len;
 276         const u8 *ftie;
 277         size_t ftie_len;
 278         const u8 *r1kh_id;
 279         const u8 *gtk;
 280         size_t gtk_len;
 281         const u8 *r0kh_id;
 282         size_t r0kh_id_len;
 283         const u8 *rsn;
 284         size_t rsn_len;
 285         const u8 *rsn_pmkid;
 286         const u8 *tie;
 287         size_t tie_len;
 288 };
 289
 290
 291 static int wpa_ft_parse_ftie(const u8 *ie, size_t ie_len,
 292                              struct wpa_ft_ies *parse)
 293 {
 294         const u8 *end, *pos;
 295
 296         parse->ftie = ie;
 297         parse->ftie_len = ie_len;
 298
 299         pos = ie + sizeof(struct rsn_ftie);
 300         end = ie + ie_len;
 301
 302         while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
 303                 switch (pos[0]) {
 304                 case FTIE_SUBELEM_R1KH_ID:
 305                         if (pos[1] != FT_R1KH_ID_LEN) {
 306                                 wpa_printf(MSG_DEBUG, "FT: Invalid R1KH-ID "
 307                                            "length in FTIE: %d", pos[1]);
 308                                 return -1;
 309                         }
 310                         parse->r1kh_id = pos + 2;
 311                         break;
 312                 case FTIE_SUBELEM_GTK:
 313                         parse->gtk = pos + 2;
 314                         parse->gtk_len = pos[1];
 315                         break;
 316                 case FTIE_SUBELEM_R0KH_ID:
 317                         if (pos[1] < 1 || pos[1] > FT_R0KH_ID_MAX_LEN) {
 318                                 wpa_printf(MSG_DEBUG, "FT: Invalid R0KH-ID "
 319                                            "length in FTIE: %d", pos[1]);
 320                                 return -1;
 321                         }
 322                         parse->r0kh_id = pos + 2;
 323                         parse->r0kh_id_len = pos[1];
 324                         break;
 325                 }
 326
 327                 pos += 2 + pos[1];
 328         }
 329
 330         return 0;
 331 }
 332
 333
 334 static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len,
 335                             struct wpa_ft_ies *parse)
 336 {
 337         const u8 *end, *pos;
 338         struct wpa_ie_data data;
 339         int ret;
 340
 341         os_memset(parse, 0, sizeof(*parse));
 342         if (ies == NULL)
 343                 return 0;
 344
 345         pos = ies;
 346         end = ies + ies_len;
 347         while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
 348                 switch (pos[0]) {
 349                 case WLAN_EID_RSN:
 350                         parse->rsn = pos + 2;
 351                         parse->rsn_len = pos[1];
 352                         ret = wpa_parse_wpa_ie_rsn(parse->rsn - 2,
 353                                                    parse->rsn_len + 2,
 354                                                    &data);
 355                         if (ret < 0) {
 356                                 wpa_printf(MSG_DEBUG, "FT: Failed to parse "
 357                                            "RSN IE: %d", ret);
 358                                 return -1;
 359                         }
 360                         if (data.num_pmkid == 1 && data.pmkid)
 361                                 parse->rsn_pmkid = data.pmkid;
 362                         break;
 363                 case WLAN_EID_MOBILITY_DOMAIN:
 364                         parse->mdie = pos + 2;
 365                         parse->mdie_len = pos[1];
 366                         break;
 367                 case WLAN_EID_FAST_BSS_TRANSITION:
 368                         if (wpa_ft_parse_ftie(pos + 2, pos[1], parse) < 0)
 369                                 return -1;
 370                         break;
 371                 case WLAN_EID_TIMEOUT_INTERVAL:
 372                         parse->tie = pos + 2;
 373                         parse->tie_len = pos[1];
 374                         break;
 375                 }
 376
 377                 pos += 2 + pos[1];
 378         }
 379
 380         return 0;
 381 }
 382
 383
 384 static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
 385 {
 386         int keylen;
 387         wpa_alg alg;
 388         u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
 389
 390         wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
 391
 392         switch (sm->pairwise_cipher) {
 393         case WPA_CIPHER_CCMP:
 394                 alg = WPA_ALG_CCMP;
 395                 keylen = 16;
 396                 break;
 397         case WPA_CIPHER_TKIP:
 398                 alg = WPA_ALG_TKIP;
 399                 keylen = 32;
 400                 break;
 401         default:
 402                 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
 403                            sm->pairwise_cipher);
 404                 return -1;
 405         }
 406
 407         if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
 408                            sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) {
 409                 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
 410                 return -1;
 411         }
 412
 413         return 0;
 414 }
 415
 416
 417 /**
 418  * wpa_ft_prepare_auth_request - Generate over-the-air auth request
 419  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 420  * Returns: 0 on success, -1 on failure
 421  */
 422 int wpa_ft_prepare_auth_request(struct wpa_sm *sm)
 423 {
 424         u8 *ft_ies;
 425         size_t ft_ies_len;
 426
 427         /* Generate a new SNonce */
 428         if (os_get_random(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, sm->bssid);
 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_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
 446                             int ft_action, const u8 *target_ap)
 447 {
 448         u8 *ft_ies;
 449         size_t ft_ies_len;
 450         struct wpa_ft_ies parse;
 451         struct rsn_mdie *mdie;
 452         struct rsn_ftie *ftie;
 453         u8 ptk_name[WPA_PMK_NAME_LEN];
 454         int ret;
 455         const u8 *bssid;
 456
 457         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
 458
 459         if (ft_action) {
 460                 if (!sm->over_the_ds_in_progress) {
 461                         wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
 462                                    "- drop FT Action Response");
 463                         return -1;
 464                 }
 465
 466                 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
 467                         wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
 468                                    "with this Target AP - drop FT Action "
 469                                    "Response");
 470                         return -1;
 471                 }
 472         }
 473
 474         if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
 475             sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
 476                 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
 477                            "enabled for this connection");
 478                 return -1;
 479         }
 480
 481         if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
 482                 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
 483                 return -1;
 484         }
 485
 486         mdie = (struct rsn_mdie *) parse.mdie;
 487         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 488             os_memcmp(mdie->mobility_domain, sm->mobility_domain,
 489                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 490                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 491                 return -1;
 492         }
 493
 494         ftie = (struct rsn_ftie *) parse.ftie;
 495         if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
 496                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 497                 return -1;
 498         }
 499
 500         if (parse.r0kh_id == NULL) {
 501                 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
 502                 return -1;
 503         }
 504
 505         if (parse.r0kh_id_len != sm->r0kh_id_len ||
 506             os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
 507                 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
 508                            "the current R0KH-ID");
 509                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
 510                             parse.r0kh_id, parse.r0kh_id_len);
 511                 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
 512                             sm->r0kh_id, sm->r0kh_id_len);
 513                 return -1;
 514         }
 515
 516         if (parse.r1kh_id == NULL) {
 517                 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
 518                 return -1;
 519         }
 520
 521         if (parse.rsn_pmkid == NULL ||
 522             os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) {
 523                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
 524                            "RSNIE");
 525                 return -1;
 526         }
 527
 528         os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
 529         wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
 530         wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
 531         wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN);
 532         wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
 533                           sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
 534         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
 535         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
 536                     sm->pmk_r1_name, WPA_PMK_NAME_LEN);
 537
 538         bssid = ft_action ? sm->target_ap : sm->bssid;
 539         wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr,
 540                           bssid, sm->pmk_r1_name,
 541                           (u8 *) &sm->ptk, sizeof(sm->ptk), ptk_name);
 542         wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
 543                         (u8 *) &sm->ptk, sizeof(sm->ptk));
 544         wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
 545
 546         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
 547                                     sm->pmk_r1_name, sm->ptk.kck, bssid);
 548         if (ft_ies) {
 549                 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
 550                                      ft_ies, ft_ies_len);
 551                 os_free(ft_ies);
 552         }
 553
 554         ret = wpa_ft_install_ptk(sm, bssid);
 555
 556         if (ret == 0) {
 557                 sm->ft_completed = 1;
 558                 if (ft_action) {
 559                         /* TODO: trigger re-association to the Target AP;
 560                          * MLME is now doing this automatically, but it should
 561                          * really be done only if we get here successfully. */
 562                         os_memcpy(sm->bssid, target_ap, ETH_ALEN);
 563                 }
 564         }
 565
 566         return ret;
 567 }
 568
 569
 570 int wpa_ft_is_completed(struct wpa_sm *sm)
 571 {
 572         if (sm == NULL)
 573                 return 0;
 574
 575         if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
 576             sm->key_mgmt != WPA_KEY_MGMT_FT_PSK)
 577                 return 0;
 578
 579         return sm->ft_completed;
 580 }
 581
 582
 583 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
 584                                  size_t ies_len)
 585 {
 586         struct wpa_ft_ies parse;
 587         struct rsn_mdie *mdie;
 588         struct rsn_ftie *ftie;
 589         size_t count, gtk_len, keylen, rsc_len;
 590         u8 mic[16];
 591         u8 gtk[32];
 592         int keyidx;
 593         wpa_alg alg;
 594
 595         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
 596
 597         if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
 598             sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
 599                 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
 600                            "enabled for this connection");
 601                 return -1;
 602         }
 603
 604         if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
 605                 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
 606                 return -1;
 607         }
 608
 609         mdie = (struct rsn_mdie *) parse.mdie;
 610         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 611             os_memcmp(mdie->mobility_domain, sm->mobility_domain,
 612                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 613                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 614                 return -1;
 615         }
 616
 617         ftie = (struct rsn_ftie *) parse.ftie;
 618         if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
 619                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 620                 return -1;
 621         }
 622
 623         if (parse.r0kh_id == NULL) {
 624                 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
 625                 return -1;
 626         }
 627
 628         if (parse.r0kh_id_len != sm->r0kh_id_len ||
 629             os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
 630                 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
 631                            "the current R0KH-ID");
 632                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
 633                             parse.r0kh_id, parse.r0kh_id_len);
 634                 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
 635                             sm->r0kh_id, sm->r0kh_id_len);
 636                 return -1;
 637         }
 638
 639         if (parse.r1kh_id == NULL) {
 640                 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
 641                 return -1;
 642         }
 643
 644         if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
 645                 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
 646                            "ReassocResp");
 647                 return -1;
 648         }
 649
 650         if (parse.rsn_pmkid == NULL ||
 651             os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) {
 652                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
 653                            "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
 654                 return -1;
 655         }
 656
 657         count = 3;
 658         if (parse.tie)
 659                 count++;
 660
 661         if (ftie->mic_control[1] != count) {
 662                 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in FTIE (%d)",
 663                            ftie->mic_control[1]);
 664                 return -1;
 665         }
 666
 667         if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, sm->bssid, 6,
 668                        parse.mdie - 2, parse.mdie_len + 2,
 669                        parse.ftie - 2, parse.ftie_len + 2,
 670                        parse.rsn - 2, parse.rsn_len + 2, NULL, 0,
 671                        mic) < 0) {
 672                 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
 673                 return -1;
 674         }
 675
 676         if (os_memcmp(mic, ftie->mic, 16) != 0) {
 677                 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
 678                 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
 679                 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
 680                 return -1;
 681         }
 682
 683         if (parse.gtk == NULL) {
 684                 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
 685                 return 0;
 686         }
 687
 688         wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
 689                         parse.gtk, parse.gtk_len);
 690
 691         if (parse.gtk_len < 10 + 24 || (parse.gtk_len - 10) % 8 ||
 692             parse.gtk_len - 18 > sizeof(gtk)) {
 693                 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
 694                            "length %lu", (unsigned long) parse.gtk_len);
 695                 return -1;
 696         }
 697         gtk_len = parse.gtk_len - 18;
 698         if (aes_unwrap(sm->ptk.kek, gtk_len / 8, parse.gtk + 10, gtk)) {
 699                 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
 700                            "decrypt GTK");
 701                 return -1;
 702         }
 703
 704         switch (sm->group_cipher) {
 705         case WPA_CIPHER_CCMP:
 706                 keylen = 16;
 707                 rsc_len = 6;
 708                 alg = WPA_ALG_CCMP;
 709                 break;
 710         case WPA_CIPHER_TKIP:
 711                 keylen = 32;
 712                 rsc_len = 6;
 713                 alg = WPA_ALG_TKIP;
 714                 break;
 715         case WPA_CIPHER_WEP104:
 716                 keylen = 13;
 717                 rsc_len = 0;
 718                 alg = WPA_ALG_WEP;
 719                 break;
 720         case WPA_CIPHER_WEP40:
 721                 keylen = 5;
 722                 rsc_len = 0;
 723                 alg = WPA_ALG_WEP;
 724                 break;
 725         default:
 726                 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
 727                            sm->group_cipher);
 728                 return -1;
 729         }
 730
 731         if (gtk_len < keylen) {
 732                 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
 733                 return -1;
 734         }
 735
 736         /* Key Info[1] | Key Length[1] | RSC[8] | Key[5..32]. */
 737
 738         keyidx = parse.gtk[0] & 0x03;
 739
 740         if (parse.gtk[1] != keylen) {
 741                 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
 742                            "negotiated %lu",
 743                            parse.gtk[1], (unsigned long) keylen);
 744                 return -1;
 745         }
 746
 747         wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
 748         if (wpa_sm_set_key(sm, alg, (u8 *) "\xff\xff\xff\xff\xff\xff",
 749                            keyidx, 0, parse.gtk + 2, rsc_len, gtk, keylen) < 0)
 750         {
 751                 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
 752                            "driver.");
 753                 return -1;
 754         }
 755
 756         return 0;
 757 }
 758
 759
 760 /**
 761  * wpa_ft_start_over_ds - Generate over-the-DS auth request
 762  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 763  * Returns: 0 on success, -1 on failure
 764  */
 765 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap)
 766 {
 767         u8 *ft_ies;
 768         size_t ft_ies_len;
 769
 770         wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
 771                    MAC2STR(target_ap));
 772
 773         /* Generate a new SNonce */
 774         if (os_get_random(sm->snonce, WPA_NONCE_LEN)) {
 775                 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
 776                 return -1;
 777         }
 778
 779         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
 780                                     NULL, target_ap);
 781         if (ft_ies) {
 782                 sm->over_the_ds_in_progress = 1;
 783                 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
 784                 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
 785                 os_free(ft_ies);
 786         }
 787
 788         return 0;
 789 }
 790
 791 #endif /* CONFIG_IEEE80211R */