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 "crypto/aes_wrap.h"
  19 #include "crypto/random.h"
  20 #include "common/ieee802_11_defs.h"
  21 #include "common/ieee802_11_common.h"
  22 #include "wpa.h"
  23 #include "wpa_i.h"
  24 #include "wpa_ie.h"
  25
  26 #ifdef CONFIG_IEEE80211R
  27
  28 int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr,
  29                       const struct wpa_eapol_key *key,
  30                       struct wpa_ptk *ptk, size_t ptk_len)
  31 {
  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, sm->pmk_r1_name);
  50         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
  51         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
  52                     WPA_PMK_NAME_LEN);
  53         wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr,
  54                           sm->bssid, sm->pmk_r1_name,
  55                           (u8 *) ptk, ptk_len, ptk_name);
  56         wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len);
  57         wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
  58
  59         return 0;
  60 }
  61
  62
  63 /**
  64  * wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters
  65  * @sm: Pointer to WPA state machine data from wpa_sm_init()
  66  * @ies: Association Response IEs or %NULL to clear FT parameters
  67  * @ies_len: Length of ies buffer in octets
  68  * Returns: 0 on success, -1 on failure
  69  */
  70 int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *ies, size_t ies_len)
  71 {
  72         struct wpa_ft_ies ft;
  73
  74         if (sm == NULL)
  75                 return 0;
  76
  77         if (wpa_ft_parse_ies(ies, ies_len, &ft) < 0)
  78                 return -1;
  79
  80         if (ft.mdie && ft.mdie_len < MOBILITY_DOMAIN_ID_LEN + 1)
  81                 return -1;
  82
  83         if (ft.mdie) {
  84                 wpa_hexdump(MSG_DEBUG, "FT: Mobility domain",
  85                             ft.mdie, MOBILITY_DOMAIN_ID_LEN);
  86                 os_memcpy(sm->mobility_domain, ft.mdie,
  87                           MOBILITY_DOMAIN_ID_LEN);
  88                 sm->mdie_ft_capab = ft.mdie[MOBILITY_DOMAIN_ID_LEN];
  89                 wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x",
  90                            sm->mdie_ft_capab);
  91         } else
  92                 os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);
  93
  94         if (ft.r0kh_id) {
  95                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID",
  96                             ft.r0kh_id, ft.r0kh_id_len);
  97                 os_memcpy(sm->r0kh_id, ft.r0kh_id, ft.r0kh_id_len);
  98                 sm->r0kh_id_len = ft.r0kh_id_len;
  99         } else {
 100                 /* FIX: When should R0KH-ID be cleared? We need to keep the
 101                  * old R0KH-ID in order to be able to use this during FT. */
 102                 /*
 103                  * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN);
 104                  * sm->r0kh_id_len = 0;
 105                  */
 106         }
 107
 108         if (ft.r1kh_id) {
 109                 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID",
 110                             ft.r1kh_id, FT_R1KH_ID_LEN);
 111                 os_memcpy(sm->r1kh_id, ft.r1kh_id, FT_R1KH_ID_LEN);
 112         } else
 113                 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
 114
 115         os_free(sm->assoc_resp_ies);
 116         sm->assoc_resp_ies = os_malloc(ft.mdie_len + 2 + ft.ftie_len + 2);
 117         if (sm->assoc_resp_ies) {
 118                 u8 *pos = sm->assoc_resp_ies;
 119                 if (ft.mdie) {
 120                         os_memcpy(pos, ft.mdie - 2, ft.mdie_len + 2);
 121                         pos += ft.mdie_len + 2;
 122                 }
 123                 if (ft.ftie) {
 124                         os_memcpy(pos, ft.ftie - 2, ft.ftie_len + 2);
 125                         pos += ft.ftie_len + 2;
 126                 }
 127                 sm->assoc_resp_ies_len = pos - sm->assoc_resp_ies;
 128                 wpa_hexdump(MSG_DEBUG, "FT: Stored MDIE and FTIE from "
 129                             "(Re)Association Response",
 130                             sm->assoc_resp_ies, sm->assoc_resp_ies_len);
 131         }
 132
 133         return 0;
 134 }
 135
 136
 137 /**
 138  * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request
 139  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 140  * @len: Buffer for returning the length of the IEs
 141  * @anonce: ANonce or %NULL if not yet available
 142  * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List
 143  * @kck: 128-bit KCK for MIC or %NULL if no MIC is used
 144  * @target_ap: Target AP address
 145  * @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL
 146  * @ric_ies_len: Length of ric_ies buffer in octets
 147  * @ap_mdie: Mobility Domain IE from the target AP
 148  * Returns: Pointer to buffer with IEs or %NULL on failure
 149  *
 150  * Caller is responsible for freeing the returned buffer with os_free();
 151  */
 152 static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
 153                                const u8 *anonce, const u8 *pmk_name,
 154                                const u8 *kck, const u8 *target_ap,
 155                                const u8 *ric_ies, size_t ric_ies_len,
 156                                const u8 *ap_mdie)
 157 {
 158         size_t buf_len;
 159         u8 *buf, *pos, *ftie_len, *ftie_pos;
 160         struct rsn_mdie *mdie;
 161         struct rsn_ftie *ftie;
 162         struct rsn_ie_hdr *rsnie;
 163         u16 capab;
 164
 165         sm->ft_completed = 0;
 166
 167         buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
 168                 2 + sm->r0kh_id_len + ric_ies_len + 100;
 169         buf = os_zalloc(buf_len);
 170         if (buf == NULL)
 171                 return NULL;
 172         pos = buf;
 173
 174         /* RSNIE[PMKR0Name/PMKR1Name] */
 175         rsnie = (struct rsn_ie_hdr *) pos;
 176         rsnie->elem_id = WLAN_EID_RSN;
 177         WPA_PUT_LE16(rsnie->version, RSN_VERSION);
 178         pos = (u8 *) (rsnie + 1);
 179
 180         /* Group Suite Selector */
 181         if (sm->group_cipher == WPA_CIPHER_CCMP)
 182                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
 183         else if (sm->group_cipher == WPA_CIPHER_TKIP)
 184                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
 185         else {
 186                 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
 187                            sm->group_cipher);
 188                 os_free(buf);
 189                 return NULL;
 190         }
 191         pos += RSN_SELECTOR_LEN;
 192
 193         /* Pairwise Suite Count */
 194         WPA_PUT_LE16(pos, 1);
 195         pos += 2;
 196
 197         /* Pairwise Suite List */
 198         if (sm->pairwise_cipher == WPA_CIPHER_CCMP)
 199                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
 200         else if (sm->pairwise_cipher == WPA_CIPHER_TKIP)
 201                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
 202         else {
 203                 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
 204                            sm->pairwise_cipher);
 205                 os_free(buf);
 206                 return NULL;
 207         }
 208         pos += RSN_SELECTOR_LEN;
 209
 210         /* Authenticated Key Management Suite Count */
 211         WPA_PUT_LE16(pos, 1);
 212         pos += 2;
 213
 214         /* Authenticated Key Management Suite List */
 215         if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
 216                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
 217         else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
 218                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
 219         else {
 220                 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
 221                            sm->key_mgmt);
 222                 os_free(buf);
 223                 return NULL;
 224         }
 225         pos += RSN_SELECTOR_LEN;
 226
 227         /* RSN Capabilities */
 228         capab = 0;
 229 #ifdef CONFIG_IEEE80211W
 230         if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
 231                 capab |= WPA_CAPABILITY_MFPC;
 232 #endif /* CONFIG_IEEE80211W */
 233         WPA_PUT_LE16(pos, capab);
 234         pos += 2;
 235
 236         /* PMKID Count */
 237         WPA_PUT_LE16(pos, 1);
 238         pos += 2;
 239
 240         /* PMKID List [PMKR0Name/PMKR1Name] */
 241         os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
 242         pos += WPA_PMK_NAME_LEN;
 243
 244 #ifdef CONFIG_IEEE80211W
 245         if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
 246                 /* Management Group Cipher Suite */
 247                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
 248                 pos += RSN_SELECTOR_LEN;
 249         }
 250 #endif /* CONFIG_IEEE80211W */
 251
 252         rsnie->len = (pos - (u8 *) rsnie) - 2;
 253
 254         /* MDIE */
 255         *pos++ = WLAN_EID_MOBILITY_DOMAIN;
 256         *pos++ = sizeof(*mdie);
 257         mdie = (struct rsn_mdie *) pos;
 258         pos += sizeof(*mdie);
 259         os_memcpy(mdie->mobility_domain, sm->mobility_domain,
 260                   MOBILITY_DOMAIN_ID_LEN);
 261         mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
 262                 sm->mdie_ft_capab;
 263
 264         /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
 265         ftie_pos = pos;
 266         *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
 267         ftie_len = pos++;
 268         ftie = (struct rsn_ftie *) pos;
 269         pos += sizeof(*ftie);
 270         os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
 271         if (anonce)
 272                 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
 273         if (kck) {
 274                 /* R1KH-ID sub-element in third FT message */
 275                 *pos++ = FTIE_SUBELEM_R1KH_ID;
 276                 *pos++ = FT_R1KH_ID_LEN;
 277                 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
 278                 pos += FT_R1KH_ID_LEN;
 279         }
 280         /* R0KH-ID sub-element */
 281         *pos++ = FTIE_SUBELEM_R0KH_ID;
 282         *pos++ = sm->r0kh_id_len;
 283         os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
 284         pos += sm->r0kh_id_len;
 285         *ftie_len = pos - ftie_len - 1;
 286
 287         if (ric_ies) {
 288                 /* RIC Request */
 289                 os_memcpy(pos, ric_ies, ric_ies_len);
 290                 pos += ric_ies_len;
 291         }
 292
 293         if (kck) {
 294                 /*
 295                  * IEEE Std 802.11r-2008, 11A.8.4
 296                  * MIC shall be calculated over:
 297                  * non-AP STA MAC address
 298                  * Target AP MAC address
 299                  * Transaction seq number (5 for ReassocReq, 3 otherwise)
 300                  * RSN IE
 301                  * MDIE
 302                  * FTIE (with MIC field set to 0)
 303                  * RIC-Request (if present)
 304                  */
 305                 /* Information element count */
 306                 ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies,
 307                                                                ric_ies_len);
 308                 if (wpa_ft_mic(kck, sm->own_addr, target_ap, 5,
 309                                ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
 310                                ftie_pos, 2 + *ftie_len,
 311                                (u8 *) rsnie, 2 + rsnie->len, ric_ies,
 312                                ric_ies_len, ftie->mic) < 0) {
 313                         wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
 314                         os_free(buf);
 315                         return NULL;
 316                 }
 317         }
 318
 319         *len = pos - buf;
 320
 321         return buf;
 322 }
 323
 324
 325 static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
 326 {
 327         int keylen;
 328         enum wpa_alg alg;
 329         u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
 330
 331         wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
 332
 333         switch (sm->pairwise_cipher) {
 334         case WPA_CIPHER_CCMP:
 335                 alg = WPA_ALG_CCMP;
 336                 keylen = 16;
 337                 break;
 338         case WPA_CIPHER_TKIP:
 339                 alg = WPA_ALG_TKIP;
 340                 keylen = 32;
 341                 break;
 342         default:
 343                 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
 344                            sm->pairwise_cipher);
 345                 return -1;
 346         }
 347
 348         if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
 349                            sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) {
 350                 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
 351                 return -1;
 352         }
 353
 354         return 0;
 355 }
 356
 357
 358 /**
 359  * wpa_ft_prepare_auth_request - Generate over-the-air auth request
 360  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 361  * @mdie: Target AP MDIE
 362  * Returns: 0 on success, -1 on failure
 363  */
 364 int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
 365 {
 366         u8 *ft_ies;
 367         size_t ft_ies_len;
 368
 369         /* Generate a new SNonce */
 370         if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
 371                 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
 372                 return -1;
 373         }
 374
 375         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
 376                                     NULL, sm->bssid, NULL, 0, mdie);
 377         if (ft_ies) {
 378                 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
 379                                      ft_ies, ft_ies_len);
 380                 os_free(ft_ies);
 381         }
 382
 383         return 0;
 384 }
 385
 386
 387 int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
 388                             int ft_action, const u8 *target_ap,
 389                             const u8 *ric_ies, size_t ric_ies_len)
 390 {
 391         u8 *ft_ies;
 392         size_t ft_ies_len, ptk_len;
 393         struct wpa_ft_ies parse;
 394         struct rsn_mdie *mdie;
 395         struct rsn_ftie *ftie;
 396         u8 ptk_name[WPA_PMK_NAME_LEN];
 397         int ret;
 398         const u8 *bssid;
 399
 400         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
 401         wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
 402
 403         if (ft_action) {
 404                 if (!sm->over_the_ds_in_progress) {
 405                         wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
 406                                    "- drop FT Action Response");
 407                         return -1;
 408                 }
 409
 410                 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
 411                         wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
 412                                    "with this Target AP - drop FT Action "
 413                                    "Response");
 414                         return -1;
 415                 }
 416         }
 417
 418         if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
 419             sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
 420                 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
 421                            "enabled for this connection");
 422                 return -1;
 423         }
 424
 425         if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
 426                 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
 427                 return -1;
 428         }
 429
 430         mdie = (struct rsn_mdie *) parse.mdie;
 431         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 432             os_memcmp(mdie->mobility_domain, sm->mobility_domain,
 433                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 434                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 435                 return -1;
 436         }
 437
 438         ftie = (struct rsn_ftie *) parse.ftie;
 439         if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
 440                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 441                 return -1;
 442         }
 443
 444         if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
 445                 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
 446                 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
 447                             ftie->snonce, WPA_NONCE_LEN);
 448                 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
 449                             sm->snonce, WPA_NONCE_LEN);
 450                 return -1;
 451         }
 452
 453         if (parse.r0kh_id == NULL) {
 454                 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
 455                 return -1;
 456         }
 457
 458         if (parse.r0kh_id_len != sm->r0kh_id_len ||
 459             os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
 460                 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
 461                            "the current R0KH-ID");
 462                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
 463                             parse.r0kh_id, parse.r0kh_id_len);
 464                 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
 465                             sm->r0kh_id, sm->r0kh_id_len);
 466                 return -1;
 467         }
 468
 469         if (parse.r1kh_id == NULL) {
 470                 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
 471                 return -1;
 472         }
 473
 474         if (parse.rsn_pmkid == NULL ||
 475             os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) {
 476                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
 477                            "RSNIE");
 478                 return -1;
 479         }
 480
 481         os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
 482         wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
 483         wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
 484         wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN);
 485         os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN);
 486         wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
 487                           sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
 488         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
 489         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
 490                     sm->pmk_r1_name, WPA_PMK_NAME_LEN);
 491
 492         bssid = target_ap;
 493         ptk_len = sm->pairwise_cipher == WPA_CIPHER_CCMP ? 48 : 64;
 494         wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr,
 495                           bssid, sm->pmk_r1_name,
 496                           (u8 *) &sm->ptk, ptk_len, ptk_name);
 497         wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
 498                         (u8 *) &sm->ptk, ptk_len);
 499         wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
 500
 501         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
 502                                     sm->pmk_r1_name, sm->ptk.kck, bssid,
 503                                     ric_ies, ric_ies_len,
 504                                     parse.mdie ? parse.mdie - 2 : NULL);
 505         if (ft_ies) {
 506                 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
 507                                      ft_ies, ft_ies_len);
 508                 os_free(ft_ies);
 509         }
 510
 511         wpa_sm_mark_authenticated(sm, bssid);
 512         ret = wpa_ft_install_ptk(sm, bssid);
 513         if (ret) {
 514                 /*
 515                  * Some drivers do not support key configuration when we are
 516                  * not associated with the target AP. Work around this by
 517                  * trying again after the following reassociation gets
 518                  * completed.
 519                  */
 520                 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
 521                            "association - try again after reassociation");
 522                 sm->set_ptk_after_assoc = 1;
 523         } else
 524                 sm->set_ptk_after_assoc = 0;
 525
 526         sm->ft_completed = 1;
 527         if (ft_action) {
 528                 /*
 529                  * The caller is expected trigger re-association with the
 530                  * Target AP.
 531                  */
 532                 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
 533         }
 534
 535         return 0;
 536 }
 537
 538
 539 int wpa_ft_is_completed(struct wpa_sm *sm)
 540 {
 541         if (sm == NULL)
 542                 return 0;
 543
 544         if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
 545             sm->key_mgmt != WPA_KEY_MGMT_FT_PSK)
 546                 return 0;
 547
 548         return sm->ft_completed;
 549 }
 550
 551
 552 static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
 553                                       size_t gtk_elem_len)
 554 {
 555         u8 gtk[32];
 556         int keyidx;
 557         enum wpa_alg alg;
 558         size_t gtk_len, keylen, rsc_len;
 559
 560         if (gtk_elem == NULL) {
 561                 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
 562                 return 0;
 563         }
 564
 565         wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
 566                         gtk_elem, gtk_elem_len);
 567
 568         if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
 569             gtk_elem_len - 19 > sizeof(gtk)) {
 570                 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
 571                            "length %lu", (unsigned long) gtk_elem_len);
 572                 return -1;
 573         }
 574         gtk_len = gtk_elem_len - 19;
 575         if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 11, gtk)) {
 576                 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
 577                            "decrypt GTK");
 578                 return -1;
 579         }
 580
 581         switch (sm->group_cipher) {
 582         case WPA_CIPHER_CCMP:
 583                 keylen = 16;
 584                 rsc_len = 6;
 585                 alg = WPA_ALG_CCMP;
 586                 break;
 587         case WPA_CIPHER_TKIP:
 588                 keylen = 32;
 589                 rsc_len = 6;
 590                 alg = WPA_ALG_TKIP;
 591                 break;
 592         case WPA_CIPHER_WEP104:
 593                 keylen = 13;
 594                 rsc_len = 0;
 595                 alg = WPA_ALG_WEP;
 596                 break;
 597         case WPA_CIPHER_WEP40:
 598                 keylen = 5;
 599                 rsc_len = 0;
 600                 alg = WPA_ALG_WEP;
 601                 break;
 602         default:
 603                 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
 604                            sm->group_cipher);
 605                 return -1;
 606         }
 607
 608         if (gtk_len < keylen) {
 609                 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
 610                 return -1;
 611         }
 612
 613         /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
 614
 615         keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
 616
 617         if (gtk_elem[2] != keylen) {
 618                 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
 619                            "negotiated %lu",
 620                            gtk_elem[2], (unsigned long) keylen);
 621                 return -1;
 622         }
 623
 624         wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
 625         if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0,
 626                            gtk_elem + 3, rsc_len, gtk, keylen) < 0) {
 627                 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
 628                            "driver.");
 629                 return -1;
 630         }
 631
 632         return 0;
 633 }
 634
 635
 636 #ifdef CONFIG_IEEE80211W
 637 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
 638                                        size_t igtk_elem_len)
 639 {
 640         u8 igtk[WPA_IGTK_LEN];
 641         u16 keyidx;
 642
 643         if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
 644                 return 0;
 645
 646         if (igtk_elem == NULL) {
 647                 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
 648                 return 0;
 649         }
 650
 651         wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
 652                         igtk_elem, igtk_elem_len);
 653
 654         if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
 655                 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
 656                            "length %lu", (unsigned long) igtk_elem_len);
 657                 return -1;
 658         }
 659         if (igtk_elem[8] != WPA_IGTK_LEN) {
 660                 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
 661                            "%d", igtk_elem[8]);
 662                 return -1;
 663         }
 664
 665         if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) {
 666                 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
 667                            "decrypt IGTK");
 668                 return -1;
 669         }
 670
 671         /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
 672
 673         keyidx = WPA_GET_LE16(igtk_elem);
 674
 675         wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
 676                         WPA_IGTK_LEN);
 677         if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0,
 678                            igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) {
 679                 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
 680                            "driver.");
 681                 return -1;
 682         }
 683
 684         return 0;
 685 }
 686 #endif /* CONFIG_IEEE80211W */
 687
 688
 689 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
 690                                  size_t ies_len, const u8 *src_addr)
 691 {
 692         struct wpa_ft_ies parse;
 693         struct rsn_mdie *mdie;
 694         struct rsn_ftie *ftie;
 695         unsigned int count;
 696         u8 mic[16];
 697
 698         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
 699
 700         if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
 701             sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
 702                 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
 703                            "enabled for this connection");
 704                 return -1;
 705         }
 706
 707         if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
 708                 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
 709                 return -1;
 710         }
 711
 712         mdie = (struct rsn_mdie *) parse.mdie;
 713         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 714             os_memcmp(mdie->mobility_domain, sm->mobility_domain,
 715                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 716                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 717                 return -1;
 718         }
 719
 720         ftie = (struct rsn_ftie *) parse.ftie;
 721         if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
 722                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 723                 return -1;
 724         }
 725
 726         if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
 727                 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
 728                 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
 729                             ftie->snonce, WPA_NONCE_LEN);
 730                 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
 731                             sm->snonce, WPA_NONCE_LEN);
 732                 return -1;
 733         }
 734
 735         if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
 736                 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
 737                 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
 738                             ftie->anonce, WPA_NONCE_LEN);
 739                 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
 740                             sm->anonce, WPA_NONCE_LEN);
 741                 return -1;
 742         }
 743
 744         if (parse.r0kh_id == NULL) {
 745                 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
 746                 return -1;
 747         }
 748
 749         if (parse.r0kh_id_len != sm->r0kh_id_len ||
 750             os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
 751                 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
 752                            "the current R0KH-ID");
 753                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
 754                             parse.r0kh_id, parse.r0kh_id_len);
 755                 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
 756                             sm->r0kh_id, sm->r0kh_id_len);
 757                 return -1;
 758         }
 759
 760         if (parse.r1kh_id == NULL) {
 761                 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
 762                 return -1;
 763         }
 764
 765         if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
 766                 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
 767                            "ReassocResp");
 768                 return -1;
 769         }
 770
 771         if (parse.rsn_pmkid == NULL ||
 772             os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) {
 773                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
 774                            "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
 775                 return -1;
 776         }
 777
 778         count = 3;
 779         if (parse.ric)
 780                 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
 781         if (ftie->mic_control[1] != count) {
 782                 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
 783                            "Control: received %u expected %u",
 784                            ftie->mic_control[1], count);
 785                 return -1;
 786         }
 787
 788         if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6,
 789                        parse.mdie - 2, parse.mdie_len + 2,
 790                        parse.ftie - 2, parse.ftie_len + 2,
 791                        parse.rsn - 2, parse.rsn_len + 2,
 792                        parse.ric, parse.ric_len,
 793                        mic) < 0) {
 794                 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
 795                 return -1;
 796         }
 797
 798         if (os_memcmp(mic, ftie->mic, 16) != 0) {
 799                 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
 800                 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
 801                 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
 802                 return -1;
 803         }
 804
 805         if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
 806                 return -1;
 807
 808 #ifdef CONFIG_IEEE80211W
 809         if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
 810                 return -1;
 811 #endif /* CONFIG_IEEE80211W */
 812
 813         if (sm->set_ptk_after_assoc) {
 814                 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
 815                            "are associated");
 816                 if (wpa_ft_install_ptk(sm, src_addr) < 0)
 817                         return -1;
 818                 sm->set_ptk_after_assoc = 0;
 819         }
 820
 821         if (parse.ric) {
 822                 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
 823                             parse.ric, parse.ric_len);
 824                 /* TODO: parse response and inform driver about results */
 825         }
 826
 827         return 0;
 828 }
 829
 830
 831 /**
 832  * wpa_ft_start_over_ds - Generate over-the-DS auth request
 833  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 834  * @target_ap: Target AP Address
 835  * @mdie: Mobility Domain IE from the target AP
 836  * Returns: 0 on success, -1 on failure
 837  */
 838 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
 839                          const u8 *mdie)
 840 {
 841         u8 *ft_ies;
 842         size_t ft_ies_len;
 843
 844         wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
 845                    MAC2STR(target_ap));
 846
 847         /* Generate a new SNonce */
 848         if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
 849                 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
 850                 return -1;
 851         }
 852
 853         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
 854                                     NULL, target_ap, NULL, 0, mdie);
 855         if (ft_ies) {
 856                 sm->over_the_ds_in_progress = 1;
 857                 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
 858                 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
 859                 os_free(ft_ies);
 860         }
 861
 862         return 0;
 863 }
 864
 865 #endif /* CONFIG_IEEE80211R */