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 "common/ieee802_11_defs.h"
  23 #include "common/ieee802_11_common.h"
  24
  25 #ifdef CONFIG_IEEE80211R
  26
  27 int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr,
  28                       const struct wpa_eapol_key *key,
  29                       struct wpa_ptk *ptk, size_t ptk_len)
  30 {
  31         u8 pmk_r1_name[WPA_PMK_NAME_LEN];
  32         u8 ptk_name[WPA_PMK_NAME_LEN];
  33         const u8 *anonce = key->key_nonce;
  34
  35         if (sm->xxkey_len == 0) {
  36                 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
  37                            "derivation");
  38                 return -1;
  39         }
  40
  41         wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid,
  42                           sm->ssid_len, sm->mobility_domain,
  43                           sm->r0kh_id, sm->r0kh_id_len, sm->own_addr,
  44                           sm->pmk_r0, sm->pmk_r0_name);
  45         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, PMK_LEN);
  46         wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name",
  47                     sm->pmk_r0_name, WPA_PMK_NAME_LEN);
  48         wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
  49                           sm->own_addr, sm->pmk_r1, pmk_r1_name);
  50         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
  51         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", pmk_r1_name, WPA_PMK_NAME_LEN);
  52         wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr,
  53                           sm->bssid, pmk_r1_name,
  54                           (u8 *) ptk, ptk_len, ptk_name);
  55         wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len);
  56         wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
  57
  58         return 0;
  59 }
  60
  61
  62 /**
  63  * wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters
  64  * @sm: Pointer to WPA state machine data from wpa_sm_init()
  65  * @mobility_domain: Mobility domain identifier (2 octets)
  66  * @r0kh_id: PMK-R0 key holder identity (1-48 octets)
  67  * @r0kh_id_len: R0KH-ID length (1-48)
  68  * @r1kh_id: PMK-R1 key holder identity (16 octets)
  69  * Returns: 0 on success, -1 on failure
  70  */
  71 int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *mobility_domain,
  72                          const u8 *r0kh_id, size_t r0kh_id_len,
  73                          const u8 *r1kh_id)
  74 {
  75         if (sm && mobility_domain) {
  76                 wpa_hexdump(MSG_DEBUG, "FT: Mobility domain",
  77                             mobility_domain, MOBILITY_DOMAIN_ID_LEN);
  78                 os_memcpy(sm->mobility_domain, mobility_domain,
  79                           MOBILITY_DOMAIN_ID_LEN);
  80         } else if (sm)
  81                 os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);
  82
  83         if (sm && r0kh_id) {
  84                 if (r0kh_id_len > FT_R0KH_ID_MAX_LEN)
  85                         return -1;
  86                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", r0kh_id, r0kh_id_len);
  87                 os_memcpy(sm->r0kh_id, r0kh_id, r0kh_id_len);
  88                 sm->r0kh_id_len = r0kh_id_len;
  89         } else if (sm) {
  90                 /* FIX: When should R0KH-ID be cleared? We need to keep the
  91                  * old R0KH-ID in order to be able to use this during FT. */
  92                 /*
  93                  * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN);
  94                  * sm->r0kh_id_len = 0;
  95                  */
  96         }
  97
  98         if (sm && r1kh_id) {
  99                 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", r1kh_id, FT_R1KH_ID_LEN);
 100                 os_memcpy(sm->r1kh_id, r1kh_id, FT_R1KH_ID_LEN);
 101         } else if (sm)
 102                 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
 103
 104         return 0;
 105 }
 106
 107
 108 /**
 109  * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request
 110  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 111  * @len: Buffer for returning the length of the IEs
 112  * @anonce: ANonce or %NULL if not yet available
 113  * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List
 114  * @kck: 128-bit KCK for MIC or %NULL if no MIC is used
 115  * @target_ap: Target AP address
 116  * @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL
 117  * @ric_ies_len: Length of ric_ies buffer in octets
 118  * Returns: Pointer to buffer with IEs or %NULL on failure
 119  *
 120  * Caller is responsible for freeing the returned buffer with os_free();
 121  */
 122 static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
 123                                const u8 *anonce, const u8 *pmk_name,
 124                                const u8 *kck, const u8 *target_ap,
 125                                const u8 *ric_ies, size_t ric_ies_len)
 126 {
 127         size_t buf_len;
 128         u8 *buf, *pos, *ftie_len, *ftie_pos;
 129         struct rsn_mdie *mdie;
 130         struct rsn_ftie *ftie;
 131         struct rsn_ie_hdr *rsnie;
 132         u16 capab;
 133
 134         sm->ft_completed = 0;
 135
 136         buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
 137                 2 + sm->r0kh_id_len + ric_ies_len + 100;
 138         buf = os_zalloc(buf_len);
 139         if (buf == NULL)
 140                 return NULL;
 141         pos = buf;
 142
 143         /* RSNIE[PMKR0Name/PMKR1Name] */
 144         rsnie = (struct rsn_ie_hdr *) pos;
 145         rsnie->elem_id = WLAN_EID_RSN;
 146         WPA_PUT_LE16(rsnie->version, RSN_VERSION);
 147         pos = (u8 *) (rsnie + 1);
 148
 149         /* Group Suite Selector */
 150         if (sm->group_cipher == WPA_CIPHER_CCMP)
 151                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
 152         else if (sm->group_cipher == WPA_CIPHER_TKIP)
 153                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
 154         else {
 155                 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
 156                            sm->group_cipher);
 157                 os_free(buf);
 158                 return NULL;
 159         }
 160         pos += RSN_SELECTOR_LEN;
 161
 162         /* Pairwise Suite Count */
 163         WPA_PUT_LE16(pos, 1);
 164         pos += 2;
 165
 166         /* Pairwise Suite List */
 167         if (sm->pairwise_cipher == WPA_CIPHER_CCMP)
 168                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
 169         else if (sm->pairwise_cipher == WPA_CIPHER_TKIP)
 170                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
 171         else {
 172                 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
 173                            sm->pairwise_cipher);
 174                 os_free(buf);
 175                 return NULL;
 176         }
 177         pos += RSN_SELECTOR_LEN;
 178
 179         /* Authenticated Key Management Suite Count */
 180         WPA_PUT_LE16(pos, 1);
 181         pos += 2;
 182
 183         /* Authenticated Key Management Suite List */
 184         if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
 185                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
 186         else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
 187                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
 188         else {
 189                 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
 190                            sm->key_mgmt);
 191                 os_free(buf);
 192                 return NULL;
 193         }
 194         pos += RSN_SELECTOR_LEN;
 195
 196         /* RSN Capabilities */
 197         capab = 0;
 198 #ifdef CONFIG_IEEE80211W
 199         if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
 200                 capab |= WPA_CAPABILITY_MFPC;
 201 #endif /* CONFIG_IEEE80211W */
 202         WPA_PUT_LE16(pos, capab);
 203         pos += 2;
 204
 205         /* PMKID Count */
 206         WPA_PUT_LE16(pos, 1);
 207         pos += 2;
 208
 209         /* PMKID List [PMKR0Name/PMKR1Name] */
 210         os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
 211         pos += WPA_PMK_NAME_LEN;
 212
 213 #ifdef CONFIG_IEEE80211W
 214         if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
 215                 /* Management Group Cipher Suite */
 216                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
 217                 pos += RSN_SELECTOR_LEN;
 218         }
 219 #endif /* CONFIG_IEEE80211W */
 220
 221         rsnie->len = (pos - (u8 *) rsnie) - 2;
 222
 223         /* MDIE */
 224         *pos++ = WLAN_EID_MOBILITY_DOMAIN;
 225         *pos++ = sizeof(*mdie);
 226         mdie = (struct rsn_mdie *) pos;
 227         pos += sizeof(*mdie);
 228         os_memcpy(mdie->mobility_domain, sm->mobility_domain,
 229                   MOBILITY_DOMAIN_ID_LEN);
 230         mdie->ft_capab = 0; /* FIX: copy from the target AP's MDIE */
 231
 232         /* FTIE[SNonce, R0KH-ID] */
 233         ftie_pos = pos;
 234         *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
 235         ftie_len = pos++;
 236         ftie = (struct rsn_ftie *) pos;
 237         pos += sizeof(*ftie);
 238         os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
 239         if (anonce)
 240                 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
 241         /* R0KH-ID sub-element */
 242         *pos++ = FTIE_SUBELEM_R0KH_ID;
 243         *pos++ = sm->r0kh_id_len;
 244         os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
 245         pos += sm->r0kh_id_len;
 246         *ftie_len = pos - ftie_len - 1;
 247
 248         if (ric_ies) {
 249                 /* RIC Request */
 250                 os_memcpy(pos, ric_ies, ric_ies_len);
 251                 pos += ric_ies_len;
 252         }
 253
 254         if (kck) {
 255                 /*
 256                  * IEEE Std 802.11r-2008, 11A.8.4
 257                  * MIC shall be calculated over:
 258                  * non-AP STA MAC address
 259                  * Target AP MAC address
 260                  * Transaction seq number (5 for ReassocReq, 3 otherwise)
 261                  * RSN IE
 262                  * MDIE
 263                  * FTIE (with MIC field set to 0)
 264                  * RIC-Request (if present)
 265                  */
 266                 /* Information element count */
 267                 ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies,
 268                                                                ric_ies_len);
 269                 if (wpa_ft_mic(kck, sm->own_addr, target_ap, 5,
 270                                ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
 271                                ftie_pos, 2 + *ftie_len,
 272                                (u8 *) rsnie, 2 + rsnie->len, ric_ies,
 273                                ric_ies_len, ftie->mic) < 0) {
 274                         wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
 275                         os_free(buf);
 276                         return NULL;
 277                 }
 278         }
 279
 280         *len = pos - buf;
 281
 282         return buf;
 283 }
 284
 285
 286 struct wpa_ft_ies {
 287         const u8 *mdie;
 288         size_t mdie_len;
 289         const u8 *ftie;
 290         size_t ftie_len;
 291         const u8 *r1kh_id;
 292         const u8 *gtk;
 293         size_t gtk_len;
 294         const u8 *r0kh_id;
 295         size_t r0kh_id_len;
 296         const u8 *rsn;
 297         size_t rsn_len;
 298         const u8 *rsn_pmkid;
 299         const u8 *tie;
 300         size_t tie_len;
 301         const u8 *igtk;
 302         size_t igtk_len;
 303         const u8 *ric;
 304         size_t ric_len;
 305 };
 306
 307
 308 static int wpa_ft_parse_ftie(const u8 *ie, size_t ie_len,
 309                              struct wpa_ft_ies *parse)
 310 {
 311         const u8 *end, *pos;
 312
 313         parse->ftie = ie;
 314         parse->ftie_len = ie_len;
 315
 316         pos = ie + sizeof(struct rsn_ftie);
 317         end = ie + ie_len;
 318
 319         while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
 320                 switch (pos[0]) {
 321                 case FTIE_SUBELEM_R1KH_ID:
 322                         if (pos[1] != FT_R1KH_ID_LEN) {
 323                                 wpa_printf(MSG_DEBUG, "FT: Invalid R1KH-ID "
 324                                            "length in FTIE: %d", pos[1]);
 325                                 return -1;
 326                         }
 327                         parse->r1kh_id = pos + 2;
 328                         break;
 329                 case FTIE_SUBELEM_GTK:
 330                         parse->gtk = pos + 2;
 331                         parse->gtk_len = pos[1];
 332                         break;
 333                 case FTIE_SUBELEM_R0KH_ID:
 334                         if (pos[1] < 1 || pos[1] > FT_R0KH_ID_MAX_LEN) {
 335                                 wpa_printf(MSG_DEBUG, "FT: Invalid R0KH-ID "
 336                                            "length in FTIE: %d", pos[1]);
 337                                 return -1;
 338                         }
 339                         parse->r0kh_id = pos + 2;
 340                         parse->r0kh_id_len = pos[1];
 341                         break;
 342 #ifdef CONFIG_IEEE80211W
 343                 case FTIE_SUBELEM_IGTK:
 344                         parse->igtk = pos + 2;
 345                         parse->igtk_len = pos[1];
 346                         break;
 347 #endif /* CONFIG_IEEE80211W */
 348                 }
 349
 350                 pos += 2 + pos[1];
 351         }
 352
 353         return 0;
 354 }
 355
 356
 357 static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len,
 358                             struct wpa_ft_ies *parse)
 359 {
 360         const u8 *end, *pos;
 361         struct wpa_ie_data data;
 362         int ret;
 363         const struct rsn_ftie *ftie;
 364         int prot_ie_count = 0;
 365
 366         os_memset(parse, 0, sizeof(*parse));
 367         if (ies == NULL)
 368                 return 0;
 369
 370         pos = ies;
 371         end = ies + ies_len;
 372         while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
 373                 switch (pos[0]) {
 374                 case WLAN_EID_RSN:
 375                         parse->rsn = pos + 2;
 376                         parse->rsn_len = pos[1];
 377                         ret = wpa_parse_wpa_ie_rsn(parse->rsn - 2,
 378                                                    parse->rsn_len + 2,
 379                                                    &data);
 380                         if (ret < 0) {
 381                                 wpa_printf(MSG_DEBUG, "FT: Failed to parse "
 382                                            "RSN IE: %d", ret);
 383                                 return -1;
 384                         }
 385                         if (data.num_pmkid == 1 && data.pmkid)
 386                                 parse->rsn_pmkid = data.pmkid;
 387                         break;
 388                 case WLAN_EID_MOBILITY_DOMAIN:
 389                         parse->mdie = pos + 2;
 390                         parse->mdie_len = pos[1];
 391                         break;
 392                 case WLAN_EID_FAST_BSS_TRANSITION:
 393                         if (pos[1] < sizeof(*ftie))
 394                                 return -1;
 395                         ftie = (const struct rsn_ftie *) (pos + 2);
 396                         prot_ie_count = ftie->mic_control[1];
 397                         if (wpa_ft_parse_ftie(pos + 2, pos[1], parse) < 0)
 398                                 return -1;
 399                         break;
 400                 case WLAN_EID_TIMEOUT_INTERVAL:
 401                         parse->tie = pos + 2;
 402                         parse->tie_len = pos[1];
 403                         break;
 404                 case WLAN_EID_RIC_DATA:
 405                         if (parse->ric == NULL)
 406                                 parse->ric = pos;
 407                 }
 408
 409                 pos += 2 + pos[1];
 410         }
 411
 412         if (prot_ie_count == 0)
 413                 return 0; /* no MIC */
 414
 415         /*
 416          * Check that the protected IE count matches with IEs included in the
 417          * frame.
 418          */
 419         if (parse->rsn)
 420                 prot_ie_count--;
 421         if (parse->mdie)
 422                 prot_ie_count--;
 423         if (parse->ftie)
 424                 prot_ie_count--;
 425         if (parse->tie)
 426                 prot_ie_count--;
 427         if (prot_ie_count < 0) {
 428                 wpa_printf(MSG_DEBUG, "FT: Some required IEs not included in "
 429                            "the protected IE count");
 430                 return -1;
 431         }
 432
 433         if (prot_ie_count == 0 && parse->ric) {
 434                 wpa_printf(MSG_DEBUG, "FT: RIC IE(s) in the frame, but not "
 435                            "included in protected IE count");
 436                 return -1;
 437         }
 438
 439         /* Determine the end of the RIC IE(s) */
 440         pos = parse->ric;
 441         while (pos && pos + 2 <= end && pos + 2 + pos[1] <= end &&
 442                prot_ie_count) {
 443                 prot_ie_count--;
 444                 pos += 2 + pos[1];
 445         }
 446         parse->ric_len = pos - parse->ric;
 447         if (prot_ie_count) {
 448                 wpa_printf(MSG_DEBUG, "FT: %d protected IEs missing from "
 449                            "frame", (int) prot_ie_count);
 450                 return -1;
 451         }
 452
 453         return 0;
 454 }
 455
 456
 457 static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
 458 {
 459         int keylen;
 460         wpa_alg alg;
 461         u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
 462
 463         wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
 464
 465         switch (sm->pairwise_cipher) {
 466         case WPA_CIPHER_CCMP:
 467                 alg = WPA_ALG_CCMP;
 468                 keylen = 16;
 469                 break;
 470         case WPA_CIPHER_TKIP:
 471                 alg = WPA_ALG_TKIP;
 472                 keylen = 32;
 473                 break;
 474         default:
 475                 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
 476                            sm->pairwise_cipher);
 477                 return -1;
 478         }
 479
 480         if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
 481                            sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) {
 482                 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
 483                 return -1;
 484         }
 485
 486         return 0;
 487 }
 488
 489
 490 /**
 491  * wpa_ft_prepare_auth_request - Generate over-the-air auth request
 492  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 493  * Returns: 0 on success, -1 on failure
 494  */
 495 int wpa_ft_prepare_auth_request(struct wpa_sm *sm)
 496 {
 497         u8 *ft_ies;
 498         size_t ft_ies_len;
 499
 500         /* Generate a new SNonce */
 501         if (os_get_random(sm->snonce, WPA_NONCE_LEN)) {
 502                 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
 503                 return -1;
 504         }
 505
 506         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
 507                                     NULL, sm->bssid, NULL, 0);
 508         if (ft_ies) {
 509                 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
 510                                      ft_ies, ft_ies_len);
 511                 os_free(ft_ies);
 512         }
 513
 514         return 0;
 515 }
 516
 517
 518 int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
 519                             int ft_action, const u8 *target_ap,
 520                             const u8 *ric_ies, size_t ric_ies_len)
 521 {
 522         u8 *ft_ies;
 523         size_t ft_ies_len, ptk_len;
 524         struct wpa_ft_ies parse;
 525         struct rsn_mdie *mdie;
 526         struct rsn_ftie *ftie;
 527         u8 ptk_name[WPA_PMK_NAME_LEN];
 528         int ret;
 529         const u8 *bssid;
 530
 531         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
 532         wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
 533
 534         if (ft_action) {
 535                 if (!sm->over_the_ds_in_progress) {
 536                         wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
 537                                    "- drop FT Action Response");
 538                         return -1;
 539                 }
 540
 541                 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
 542                         wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
 543                                    "with this Target AP - drop FT Action "
 544                                    "Response");
 545                         return -1;
 546                 }
 547         }
 548
 549         if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
 550             sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
 551                 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
 552                            "enabled for this connection");
 553                 return -1;
 554         }
 555
 556         if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
 557                 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
 558                 return -1;
 559         }
 560
 561         mdie = (struct rsn_mdie *) parse.mdie;
 562         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 563             os_memcmp(mdie->mobility_domain, sm->mobility_domain,
 564                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 565                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 566                 return -1;
 567         }
 568
 569         ftie = (struct rsn_ftie *) parse.ftie;
 570         if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
 571                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 572                 return -1;
 573         }
 574
 575         if (parse.r0kh_id == NULL) {
 576                 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
 577                 return -1;
 578         }
 579
 580         if (parse.r0kh_id_len != sm->r0kh_id_len ||
 581             os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
 582                 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
 583                            "the current R0KH-ID");
 584                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
 585                             parse.r0kh_id, parse.r0kh_id_len);
 586                 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
 587                             sm->r0kh_id, sm->r0kh_id_len);
 588                 return -1;
 589         }
 590
 591         if (parse.r1kh_id == NULL) {
 592                 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
 593                 return -1;
 594         }
 595
 596         if (parse.rsn_pmkid == NULL ||
 597             os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) {
 598                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
 599                            "RSNIE");
 600                 return -1;
 601         }
 602
 603         os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
 604         wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
 605         wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
 606         wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN);
 607         wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
 608                           sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
 609         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
 610         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
 611                     sm->pmk_r1_name, WPA_PMK_NAME_LEN);
 612
 613         bssid = target_ap;
 614         ptk_len = sm->pairwise_cipher == WPA_CIPHER_CCMP ? 48 : 64;
 615         wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr,
 616                           bssid, sm->pmk_r1_name,
 617                           (u8 *) &sm->ptk, ptk_len, ptk_name);
 618         wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
 619                         (u8 *) &sm->ptk, ptk_len);
 620         wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
 621
 622         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
 623                                     sm->pmk_r1_name, sm->ptk.kck, bssid,
 624                                     ric_ies, ric_ies_len);
 625         if (ft_ies) {
 626                 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
 627                                      ft_ies, ft_ies_len);
 628                 os_free(ft_ies);
 629         }
 630
 631         ret = wpa_ft_install_ptk(sm, bssid);
 632
 633         if (ret == 0) {
 634                 sm->ft_completed = 1;
 635                 if (ft_action) {
 636                         /* TODO: trigger re-association to the Target AP;
 637                          * MLME is now doing this automatically, but it should
 638                          * really be done only if we get here successfully. */
 639                         os_memcpy(sm->bssid, target_ap, ETH_ALEN);
 640                 }
 641         }
 642
 643         return ret;
 644 }
 645
 646
 647 int wpa_ft_is_completed(struct wpa_sm *sm)
 648 {
 649         if (sm == NULL)
 650                 return 0;
 651
 652         if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
 653             sm->key_mgmt != WPA_KEY_MGMT_FT_PSK)
 654                 return 0;
 655
 656         return sm->ft_completed;
 657 }
 658
 659
 660 static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
 661                                       size_t gtk_elem_len)
 662 {
 663         u8 gtk[32];
 664         int keyidx;
 665         wpa_alg alg;
 666         size_t gtk_len, keylen, rsc_len;
 667
 668         if (gtk_elem == NULL) {
 669                 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
 670                 return 0;
 671         }
 672
 673         wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
 674                         gtk_elem, gtk_elem_len);
 675
 676         if (gtk_elem_len < 10 + 24 || (gtk_elem_len - 10) % 8 ||
 677             gtk_elem_len - 18 > sizeof(gtk)) {
 678                 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
 679                            "length %lu", (unsigned long) gtk_elem_len);
 680                 return -1;
 681         }
 682         gtk_len = gtk_elem_len - 18;
 683         if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 10, gtk)) {
 684                 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
 685                            "decrypt GTK");
 686                 return -1;
 687         }
 688
 689         switch (sm->group_cipher) {
 690         case WPA_CIPHER_CCMP:
 691                 keylen = 16;
 692                 rsc_len = 6;
 693                 alg = WPA_ALG_CCMP;
 694                 break;
 695         case WPA_CIPHER_TKIP:
 696                 keylen = 32;
 697                 rsc_len = 6;
 698                 alg = WPA_ALG_TKIP;
 699                 break;
 700         case WPA_CIPHER_WEP104:
 701                 keylen = 13;
 702                 rsc_len = 0;
 703                 alg = WPA_ALG_WEP;
 704                 break;
 705         case WPA_CIPHER_WEP40:
 706                 keylen = 5;
 707                 rsc_len = 0;
 708                 alg = WPA_ALG_WEP;
 709                 break;
 710         default:
 711                 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
 712                            sm->group_cipher);
 713                 return -1;
 714         }
 715
 716         if (gtk_len < keylen) {
 717                 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
 718                 return -1;
 719         }
 720
 721         /* Key Info[1] | Key Length[1] | RSC[8] | Key[5..32]. */
 722
 723         keyidx = gtk_elem[0] & 0x03;
 724
 725         if (gtk_elem[1] != keylen) {
 726                 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
 727                            "negotiated %lu",
 728                            gtk_elem[1], (unsigned long) keylen);
 729                 return -1;
 730         }
 731
 732         wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
 733         if (wpa_sm_set_key(sm, alg, (u8 *) "\xff\xff\xff\xff\xff\xff",
 734                            keyidx, 0, gtk_elem + 2, rsc_len, gtk, keylen) <
 735             0) {
 736                 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
 737                            "driver.");
 738                 return -1;
 739         }
 740
 741         return 0;
 742 }
 743
 744
 745 #ifdef CONFIG_IEEE80211W
 746 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
 747                                        size_t igtk_elem_len)
 748 {
 749         u8 igtk[WPA_IGTK_LEN];
 750         u16 keyidx;
 751
 752         if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
 753                 return 0;
 754
 755         if (igtk_elem == NULL) {
 756                 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
 757                 return 0;
 758         }
 759
 760         wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
 761                         igtk_elem, igtk_elem_len);
 762
 763         if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
 764                 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
 765                            "length %lu", (unsigned long) igtk_elem_len);
 766                 return -1;
 767         }
 768         if (igtk_elem[8] != WPA_IGTK_LEN) {
 769                 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
 770                            "%d", igtk_elem[8]);
 771                 return -1;
 772         }
 773
 774         if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) {
 775                 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
 776                            "decrypt IGTK");
 777                 return -1;
 778         }
 779
 780         /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
 781
 782         keyidx = WPA_GET_LE16(igtk_elem);
 783
 784         wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
 785                         WPA_IGTK_LEN);
 786         if (wpa_sm_set_key(sm, WPA_ALG_IGTK, (u8 *) "\xff\xff\xff\xff\xff\xff",
 787                            keyidx, 0, igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) <
 788             0) {
 789                 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
 790                            "driver.");
 791                 return -1;
 792         }
 793
 794         return 0;
 795 }
 796 #endif /* CONFIG_IEEE80211W */
 797
 798
 799 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
 800                                  size_t ies_len, const u8 *src_addr)
 801 {
 802         struct wpa_ft_ies parse;
 803         struct rsn_mdie *mdie;
 804         struct rsn_ftie *ftie;
 805         size_t count;
 806         u8 mic[16];
 807
 808         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
 809
 810         if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
 811             sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
 812                 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
 813                            "enabled for this connection");
 814                 return -1;
 815         }
 816
 817         if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
 818                 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
 819                 return -1;
 820         }
 821
 822         mdie = (struct rsn_mdie *) parse.mdie;
 823         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 824             os_memcmp(mdie->mobility_domain, sm->mobility_domain,
 825                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 826                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 827                 return -1;
 828         }
 829
 830         ftie = (struct rsn_ftie *) parse.ftie;
 831         if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
 832                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 833                 return -1;
 834         }
 835
 836         if (parse.r0kh_id == NULL) {
 837                 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
 838                 return -1;
 839         }
 840
 841         if (parse.r0kh_id_len != sm->r0kh_id_len ||
 842             os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
 843                 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
 844                            "the current R0KH-ID");
 845                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
 846                             parse.r0kh_id, parse.r0kh_id_len);
 847                 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
 848                             sm->r0kh_id, sm->r0kh_id_len);
 849                 return -1;
 850         }
 851
 852         if (parse.r1kh_id == NULL) {
 853                 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
 854                 return -1;
 855         }
 856
 857         if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
 858                 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
 859                            "ReassocResp");
 860                 return -1;
 861         }
 862
 863         if (parse.rsn_pmkid == NULL ||
 864             os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) {
 865                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
 866                            "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
 867                 return -1;
 868         }
 869
 870         count = 3;
 871         if (parse.tie)
 872                 count++;
 873
 874         if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6,
 875                        parse.mdie - 2, parse.mdie_len + 2,
 876                        parse.ftie - 2, parse.ftie_len + 2,
 877                        parse.rsn - 2, parse.rsn_len + 2,
 878                        parse.ric, parse.ric_len,
 879                        mic) < 0) {
 880                 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
 881                 return -1;
 882         }
 883
 884         if (os_memcmp(mic, ftie->mic, 16) != 0) {
 885                 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
 886                 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
 887                 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
 888                 return -1;
 889         }
 890
 891         if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
 892                 return -1;
 893
 894 #ifdef CONFIG_IEEE80211W
 895         if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
 896                 return -1;
 897 #endif /* CONFIG_IEEE80211W */
 898
 899         if (parse.ric) {
 900                 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
 901                             parse.ric, parse.ric_len);
 902                 /* TODO: parse response and inform driver about results */
 903         }
 904
 905         return 0;
 906 }
 907
 908
 909 /**
 910  * wpa_ft_start_over_ds - Generate over-the-DS auth request
 911  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 912  * Returns: 0 on success, -1 on failure
 913  */
 914 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap)
 915 {
 916         u8 *ft_ies;
 917         size_t ft_ies_len;
 918
 919         wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
 920                    MAC2STR(target_ap));
 921
 922         /* Generate a new SNonce */
 923         if (os_get_random(sm->snonce, WPA_NONCE_LEN)) {
 924                 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
 925                 return -1;
 926         }
 927
 928         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
 929                                     NULL, target_ap, NULL, 0);
 930         if (ft_ies) {
 931                 sm->over_the_ds_in_progress = 1;
 932                 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
 933                 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
 934                 os_free(ft_ies);
 935         }
 936
 937         return 0;
 938 }
 939
 940 #endif /* CONFIG_IEEE80211R */