contrib/wpa/src/rsn_supp/wpa_ft.c

   1 /*
   2  * WPA Supplicant - IEEE 802.11r - Fast BSS Transition
   3  * Copyright (c) 2006-2018, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10
  11 #include "common.h"
  12 #include "crypto/aes_wrap.h"
  13 #include "crypto/sha384.h"
  14 #include "crypto/random.h"
  15 #include "common/ieee802_11_defs.h"
  16 #include "common/ieee802_11_common.h"
  17 #include "wpa.h"
  18 #include "wpa_i.h"
  19
  20 #ifdef CONFIG_IEEE80211R
  21
  22 int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr,
  23                       const struct wpa_eapol_key *key, struct wpa_ptk *ptk)
  24 {
  25         u8 ptk_name[WPA_PMK_NAME_LEN];
  26         const u8 *anonce = key->key_nonce;
  27         int use_sha384 = wpa_key_mgmt_sha384(sm->key_mgmt);
  28
  29         if (sm->xxkey_len == 0) {
  30                 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
  31                            "derivation");
  32                 return -1;
  33         }
  34
  35         sm->pmk_r0_len = use_sha384 ? SHA384_MAC_LEN : PMK_LEN;
  36         if (wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid,
  37                               sm->ssid_len, sm->mobility_domain,
  38                               sm->r0kh_id, sm->r0kh_id_len, sm->own_addr,
  39                               sm->pmk_r0, sm->pmk_r0_name, use_sha384) < 0)
  40                 return -1;
  41         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, sm->pmk_r0_len);
  42         wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name",
  43                     sm->pmk_r0_name, WPA_PMK_NAME_LEN);
  44         sm->pmk_r1_len = sm->pmk_r0_len;
  45         if (wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_len, sm->pmk_r0_name,
  46                               sm->r1kh_id, sm->own_addr, sm->pmk_r1,
  47                               sm->pmk_r1_name) < 0)
  48                 return -1;
  49         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, sm->pmk_r1_len);
  50         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
  51                     WPA_PMK_NAME_LEN);
  52         return wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->pmk_r1_len, sm->snonce, anonce,
  53                                  sm->own_addr, sm->bssid, sm->pmk_r1_name, ptk,
  54                                  ptk_name, sm->key_mgmt, sm->pairwise_cipher);
  55 }
  56
  57
  58 /**
  59  * wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters
  60  * @sm: Pointer to WPA state machine data from wpa_sm_init()
  61  * @ies: Association Response IEs or %NULL to clear FT parameters
  62  * @ies_len: Length of ies buffer in octets
  63  * Returns: 0 on success, -1 on failure
  64  */
  65 int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *ies, size_t ies_len)
  66 {
  67         struct wpa_ft_ies ft;
  68         int use_sha384;
  69
  70         if (sm == NULL)
  71                 return 0;
  72
  73         use_sha384 = wpa_key_mgmt_sha384(sm->key_mgmt);
  74         if (wpa_ft_parse_ies(ies, ies_len, &ft, use_sha384) < 0)
  75                 return -1;
  76
  77         if (ft.mdie && ft.mdie_len < MOBILITY_DOMAIN_ID_LEN + 1)
  78                 return -1;
  79
  80         if (ft.mdie) {
  81                 wpa_hexdump(MSG_DEBUG, "FT: Mobility domain",
  82                             ft.mdie, MOBILITY_DOMAIN_ID_LEN);
  83                 os_memcpy(sm->mobility_domain, ft.mdie,
  84                           MOBILITY_DOMAIN_ID_LEN);
  85                 sm->mdie_ft_capab = ft.mdie[MOBILITY_DOMAIN_ID_LEN];
  86                 wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x",
  87                            sm->mdie_ft_capab);
  88         } else
  89                 os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);
  90
  91         if (ft.r0kh_id) {
  92                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID",
  93                             ft.r0kh_id, ft.r0kh_id_len);
  94                 os_memcpy(sm->r0kh_id, ft.r0kh_id, ft.r0kh_id_len);
  95                 sm->r0kh_id_len = ft.r0kh_id_len;
  96         } else {
  97                 /* FIX: When should R0KH-ID be cleared? We need to keep the
  98                  * old R0KH-ID in order to be able to use this during FT. */
  99                 /*
 100                  * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN);
 101                  * sm->r0kh_id_len = 0;
 102                  */
 103         }
 104
 105         if (ft.r1kh_id) {
 106                 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID",
 107                             ft.r1kh_id, FT_R1KH_ID_LEN);
 108                 os_memcpy(sm->r1kh_id, ft.r1kh_id, FT_R1KH_ID_LEN);
 109         } else
 110                 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
 111
 112         os_free(sm->assoc_resp_ies);
 113         sm->assoc_resp_ies = os_malloc(ft.mdie_len + 2 + ft.ftie_len + 2);
 114         if (sm->assoc_resp_ies) {
 115                 u8 *pos = sm->assoc_resp_ies;
 116                 if (ft.mdie) {
 117                         os_memcpy(pos, ft.mdie - 2, ft.mdie_len + 2);
 118                         pos += ft.mdie_len + 2;
 119                 }
 120                 if (ft.ftie) {
 121                         os_memcpy(pos, ft.ftie - 2, ft.ftie_len + 2);
 122                         pos += ft.ftie_len + 2;
 123                 }
 124                 sm->assoc_resp_ies_len = pos - sm->assoc_resp_ies;
 125                 wpa_hexdump(MSG_DEBUG, "FT: Stored MDIE and FTIE from "
 126                             "(Re)Association Response",
 127                             sm->assoc_resp_ies, sm->assoc_resp_ies_len);
 128         }
 129
 130         return 0;
 131 }
 132
 133
 134 /**
 135  * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request
 136  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 137  * @len: Buffer for returning the length of the IEs
 138  * @anonce: ANonce or %NULL if not yet available
 139  * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List
 140  * @kck: 128-bit KCK for MIC or %NULL if no MIC is used
 141  * @kck_len: KCK length in octets
 142  * @target_ap: Target AP address
 143  * @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL
 144  * @ric_ies_len: Length of ric_ies buffer in octets
 145  * @ap_mdie: Mobility Domain IE from the target AP
 146  * Returns: Pointer to buffer with IEs or %NULL on failure
 147  *
 148  * Caller is responsible for freeing the returned buffer with os_free();
 149  */
 150 static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
 151                                const u8 *anonce, const u8 *pmk_name,
 152                                const u8 *kck, size_t kck_len,
 153                                const u8 *target_ap,
 154                                const u8 *ric_ies, size_t ric_ies_len,
 155                                const u8 *ap_mdie)
 156 {
 157         size_t buf_len;
 158         u8 *buf, *pos, *ftie_len, *ftie_pos, *fte_mic, *elem_count;
 159         struct rsn_mdie *mdie;
 160         struct rsn_ie_hdr *rsnie;
 161         u16 capab;
 162         int mdie_len;
 163
 164         sm->ft_completed = 0;
 165         sm->ft_reassoc_completed = 0;
 166
 167         buf_len = 2 + sizeof(struct rsn_mdie) + 2 +
 168                 sizeof(struct rsn_ftie_sha384) +
 169                 2 + sm->r0kh_id_len + ric_ies_len + 100;
 170         buf = os_zalloc(buf_len);
 171         if (buf == NULL)
 172                 return NULL;
 173         pos = buf;
 174
 175         /* RSNIE[PMKR0Name/PMKR1Name] */
 176         rsnie = (struct rsn_ie_hdr *) pos;
 177         rsnie->elem_id = WLAN_EID_RSN;
 178         WPA_PUT_LE16(rsnie->version, RSN_VERSION);
 179         pos = (u8 *) (rsnie + 1);
 180
 181         /* Group Suite Selector */
 182         if (!wpa_cipher_valid_group(sm->group_cipher)) {
 183                 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
 184                            sm->group_cipher);
 185                 os_free(buf);
 186                 return NULL;
 187         }
 188         RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
 189                                                   sm->group_cipher));
 190         pos += RSN_SELECTOR_LEN;
 191
 192         /* Pairwise Suite Count */
 193         WPA_PUT_LE16(pos, 1);
 194         pos += 2;
 195
 196         /* Pairwise Suite List */
 197         if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
 198                 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
 199                            sm->pairwise_cipher);
 200                 os_free(buf);
 201                 return NULL;
 202         }
 203         RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
 204                                                   sm->pairwise_cipher));
 205         pos += RSN_SELECTOR_LEN;
 206
 207         /* Authenticated Key Management Suite Count */
 208         WPA_PUT_LE16(pos, 1);
 209         pos += 2;
 210
 211         /* Authenticated Key Management Suite List */
 212         if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
 213                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
 214 #ifdef CONFIG_SHA384
 215         else if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X_SHA384)
 216                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X_SHA384);
 217 #endif /* CONFIG_SHA384 */
 218         else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
 219                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
 220         else if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE)
 221                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
 222 #ifdef CONFIG_FILS
 223         else if (sm->key_mgmt == WPA_KEY_MGMT_FT_FILS_SHA256)
 224                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA256);
 225         else if (sm->key_mgmt == WPA_KEY_MGMT_FT_FILS_SHA384)
 226                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA384);
 227 #endif /* CONFIG_FILS */
 228         else {
 229                 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
 230                            sm->key_mgmt);
 231                 os_free(buf);
 232                 return NULL;
 233         }
 234         pos += RSN_SELECTOR_LEN;
 235
 236         /* RSN Capabilities */
 237         capab = 0;
 238 #ifdef CONFIG_IEEE80211W
 239         if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC ||
 240             sm->mgmt_group_cipher == WPA_CIPHER_BIP_GMAC_128 ||
 241             sm->mgmt_group_cipher == WPA_CIPHER_BIP_GMAC_256 ||
 242             sm->mgmt_group_cipher == WPA_CIPHER_BIP_CMAC_256)
 243                 capab |= WPA_CAPABILITY_MFPC;
 244 #endif /* CONFIG_IEEE80211W */
 245         WPA_PUT_LE16(pos, capab);
 246         pos += 2;
 247
 248         /* PMKID Count */
 249         WPA_PUT_LE16(pos, 1);
 250         pos += 2;
 251
 252         /* PMKID List [PMKR0Name/PMKR1Name] */
 253         os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
 254         pos += WPA_PMK_NAME_LEN;
 255
 256 #ifdef CONFIG_IEEE80211W
 257         /* Management Group Cipher Suite */
 258         switch (sm->mgmt_group_cipher) {
 259         case WPA_CIPHER_AES_128_CMAC:
 260                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
 261                 pos += RSN_SELECTOR_LEN;
 262                 break;
 263         case WPA_CIPHER_BIP_GMAC_128:
 264                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_BIP_GMAC_128);
 265                 pos += RSN_SELECTOR_LEN;
 266                 break;
 267         case WPA_CIPHER_BIP_GMAC_256:
 268                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_BIP_GMAC_256);
 269                 pos += RSN_SELECTOR_LEN;
 270                 break;
 271         case WPA_CIPHER_BIP_CMAC_256:
 272                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_BIP_CMAC_256);
 273                 pos += RSN_SELECTOR_LEN;
 274                 break;
 275         }
 276 #endif /* CONFIG_IEEE80211W */
 277
 278         rsnie->len = (pos - (u8 *) rsnie) - 2;
 279
 280         /* MDIE */
 281         mdie_len = wpa_ft_add_mdie(sm, pos, buf_len - (pos - buf), ap_mdie);
 282         if (mdie_len <= 0) {
 283                 os_free(buf);
 284                 return NULL;
 285         }
 286         mdie = (struct rsn_mdie *) (pos + 2);
 287         pos += mdie_len;
 288
 289         /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
 290         ftie_pos = pos;
 291         *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
 292         ftie_len = pos++;
 293         if (wpa_key_mgmt_sha384(sm->key_mgmt)) {
 294                 struct rsn_ftie_sha384 *ftie;
 295
 296                 ftie = (struct rsn_ftie_sha384 *) pos;
 297                 fte_mic = ftie->mic;
 298                 elem_count = &ftie->mic_control[1];
 299                 pos += sizeof(*ftie);
 300                 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
 301                 if (anonce)
 302                         os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
 303         } else {
 304                 struct rsn_ftie *ftie;
 305
 306                 ftie = (struct rsn_ftie *) pos;
 307                 fte_mic = ftie->mic;
 308                 elem_count = &ftie->mic_control[1];
 309                 pos += sizeof(*ftie);
 310                 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
 311                 if (anonce)
 312                         os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
 313         }
 314         if (kck) {
 315                 /* R1KH-ID sub-element in third FT message */
 316                 *pos++ = FTIE_SUBELEM_R1KH_ID;
 317                 *pos++ = FT_R1KH_ID_LEN;
 318                 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
 319                 pos += FT_R1KH_ID_LEN;
 320         }
 321         /* R0KH-ID sub-element */
 322         *pos++ = FTIE_SUBELEM_R0KH_ID;
 323         *pos++ = sm->r0kh_id_len;
 324         os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
 325         pos += sm->r0kh_id_len;
 326         *ftie_len = pos - ftie_len - 1;
 327
 328         if (ric_ies) {
 329                 /* RIC Request */
 330                 os_memcpy(pos, ric_ies, ric_ies_len);
 331                 pos += ric_ies_len;
 332         }
 333
 334         if (kck) {
 335                 /*
 336                  * IEEE Std 802.11r-2008, 11A.8.4
 337                  * MIC shall be calculated over:
 338                  * non-AP STA MAC address
 339                  * Target AP MAC address
 340                  * Transaction seq number (5 for ReassocReq, 3 otherwise)
 341                  * RSN IE
 342                  * MDIE
 343                  * FTIE (with MIC field set to 0)
 344                  * RIC-Request (if present)
 345                  */
 346                 /* Information element count */
 347                 *elem_count = 3 + ieee802_11_ie_count(ric_ies, ric_ies_len);
 348                 if (wpa_ft_mic(kck, kck_len, sm->own_addr, target_ap, 5,
 349                                ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
 350                                ftie_pos, 2 + *ftie_len,
 351                                (u8 *) rsnie, 2 + rsnie->len, ric_ies,
 352                                ric_ies_len, fte_mic) < 0) {
 353                         wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
 354                         os_free(buf);
 355                         return NULL;
 356                 }
 357         }
 358
 359         *len = pos - buf;
 360
 361         return buf;
 362 }
 363
 364
 365 static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
 366 {
 367         int keylen;
 368         enum wpa_alg alg;
 369         u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
 370
 371         wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
 372
 373         if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
 374                 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
 375                            sm->pairwise_cipher);
 376                 return -1;
 377         }
 378
 379         alg = wpa_cipher_to_alg(sm->pairwise_cipher);
 380         keylen = wpa_cipher_key_len(sm->pairwise_cipher);
 381
 382         if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
 383                            sizeof(null_rsc), (u8 *) sm->ptk.tk, keylen) < 0) {
 384                 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
 385                 return -1;
 386         }
 387
 388         return 0;
 389 }
 390
 391
 392 /**
 393  * wpa_ft_prepare_auth_request - Generate over-the-air auth request
 394  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 395  * @mdie: Target AP MDIE
 396  * Returns: 0 on success, -1 on failure
 397  */
 398 int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
 399 {
 400         u8 *ft_ies;
 401         size_t ft_ies_len;
 402
 403         /* Generate a new SNonce */
 404         if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
 405                 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
 406                 return -1;
 407         }
 408
 409         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
 410                                     NULL, 0, sm->bssid, NULL, 0, mdie);
 411         if (ft_ies) {
 412                 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
 413                                      ft_ies, ft_ies_len);
 414                 os_free(ft_ies);
 415         }
 416
 417         return 0;
 418 }
 419
 420
 421 int wpa_ft_add_mdie(struct wpa_sm *sm, u8 *buf, size_t buf_len,
 422                     const u8 *ap_mdie)
 423 {
 424         u8 *pos = buf;
 425         struct rsn_mdie *mdie;
 426
 427         if (buf_len < 2 + sizeof(*mdie)) {
 428                 wpa_printf(MSG_INFO,
 429                            "FT: Failed to add MDIE: short buffer, length=%zu",
 430                            buf_len);
 431                 return 0;
 432         }
 433
 434         *pos++ = WLAN_EID_MOBILITY_DOMAIN;
 435         *pos++ = sizeof(*mdie);
 436         mdie = (struct rsn_mdie *) pos;
 437         os_memcpy(mdie->mobility_domain, sm->mobility_domain,
 438                   MOBILITY_DOMAIN_ID_LEN);
 439         mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
 440                 sm->mdie_ft_capab;
 441
 442         return 2 + sizeof(*mdie);
 443 }
 444
 445
 446 const u8 * wpa_sm_get_ft_md(struct wpa_sm *sm)
 447 {
 448         return sm->mobility_domain;
 449 }
 450
 451
 452 int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
 453                             int ft_action, const u8 *target_ap,
 454                             const u8 *ric_ies, size_t ric_ies_len)
 455 {
 456         u8 *ft_ies;
 457         size_t ft_ies_len;
 458         struct wpa_ft_ies parse;
 459         struct rsn_mdie *mdie;
 460         u8 ptk_name[WPA_PMK_NAME_LEN];
 461         int ret;
 462         const u8 *bssid;
 463         const u8 *kck;
 464         size_t kck_len;
 465         int use_sha384 = wpa_key_mgmt_sha384(sm->key_mgmt);
 466         const u8 *anonce, *snonce;
 467
 468         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
 469         wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
 470
 471         if (ft_action) {
 472                 if (!sm->over_the_ds_in_progress) {
 473                         wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
 474                                    "- drop FT Action Response");
 475                         return -1;
 476                 }
 477
 478                 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
 479                         wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
 480                                    "with this Target AP - drop FT Action "
 481                                    "Response");
 482                         return -1;
 483                 }
 484         }
 485
 486         if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
 487                 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
 488                            "enabled for this connection");
 489                 return -1;
 490         }
 491
 492         if (wpa_ft_parse_ies(ies, ies_len, &parse, use_sha384) < 0) {
 493                 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
 494                 return -1;
 495         }
 496
 497         mdie = (struct rsn_mdie *) parse.mdie;
 498         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 499             os_memcmp(mdie->mobility_domain, sm->mobility_domain,
 500                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 501                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 502                 return -1;
 503         }
 504
 505         if (use_sha384) {
 506                 struct rsn_ftie_sha384 *ftie;
 507
 508                 ftie = (struct rsn_ftie_sha384 *) parse.ftie;
 509                 if (!ftie || parse.ftie_len < sizeof(*ftie)) {
 510                         wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 511                         return -1;
 512                 }
 513
 514                 anonce = ftie->anonce;
 515                 snonce = ftie->snonce;
 516         } else {
 517                 struct rsn_ftie *ftie;
 518
 519                 ftie = (struct rsn_ftie *) parse.ftie;
 520                 if (!ftie || parse.ftie_len < sizeof(*ftie)) {
 521                         wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 522                         return -1;
 523                 }
 524
 525                 anonce = ftie->anonce;
 526                 snonce = ftie->snonce;
 527         }
 528
 529         if (os_memcmp(snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
 530                 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
 531                 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
 532                             snonce, WPA_NONCE_LEN);
 533                 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
 534                             sm->snonce, WPA_NONCE_LEN);
 535                 return -1;
 536         }
 537
 538         if (parse.r0kh_id == NULL) {
 539                 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
 540                 return -1;
 541         }
 542
 543         if (parse.r0kh_id_len != sm->r0kh_id_len ||
 544             os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
 545         {
 546                 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
 547                            "the current R0KH-ID");
 548                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
 549                             parse.r0kh_id, parse.r0kh_id_len);
 550                 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
 551                             sm->r0kh_id, sm->r0kh_id_len);
 552                 return -1;
 553         }
 554
 555         if (parse.r1kh_id == NULL) {
 556                 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
 557                 return -1;
 558         }
 559
 560         if (parse.rsn_pmkid == NULL ||
 561             os_memcmp_const(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN))
 562         {
 563                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
 564                            "RSNIE");
 565                 return -1;
 566         }
 567
 568         os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
 569         wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
 570         wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
 571         wpa_hexdump(MSG_DEBUG, "FT: ANonce", anonce, WPA_NONCE_LEN);
 572         os_memcpy(sm->anonce, anonce, WPA_NONCE_LEN);
 573         if (wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_len, sm->pmk_r0_name,
 574                               sm->r1kh_id, sm->own_addr, sm->pmk_r1,
 575                               sm->pmk_r1_name) < 0)
 576                 return -1;
 577         sm->pmk_r1_len = sm->pmk_r0_len;
 578         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, sm->pmk_r1_len);
 579         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
 580                     sm->pmk_r1_name, WPA_PMK_NAME_LEN);
 581
 582         bssid = target_ap;
 583         if (wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->pmk_r1_len, sm->snonce,
 584                               anonce, sm->own_addr, bssid,
 585                               sm->pmk_r1_name, &sm->ptk, ptk_name, sm->key_mgmt,
 586                               sm->pairwise_cipher) < 0)
 587                 return -1;
 588
 589         if (wpa_key_mgmt_fils(sm->key_mgmt)) {
 590                 kck = sm->ptk.kck2;
 591                 kck_len = sm->ptk.kck2_len;
 592         } else {
 593                 kck = sm->ptk.kck;
 594                 kck_len = sm->ptk.kck_len;
 595         }
 596         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, anonce,
 597                                     sm->pmk_r1_name,
 598                                     kck, kck_len, bssid,
 599                                     ric_ies, ric_ies_len,
 600                                     parse.mdie ? parse.mdie - 2 : NULL);
 601         if (ft_ies) {
 602                 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
 603                                      ft_ies, ft_ies_len);
 604                 os_free(ft_ies);
 605         }
 606
 607         wpa_sm_mark_authenticated(sm, bssid);
 608         ret = wpa_ft_install_ptk(sm, bssid);
 609         if (ret) {
 610                 /*
 611                  * Some drivers do not support key configuration when we are
 612                  * not associated with the target AP. Work around this by
 613                  * trying again after the following reassociation gets
 614                  * completed.
 615                  */
 616                 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
 617                            "association - try again after reassociation");
 618                 sm->set_ptk_after_assoc = 1;
 619         } else
 620                 sm->set_ptk_after_assoc = 0;
 621
 622         sm->ft_completed = 1;
 623         if (ft_action) {
 624                 /*
 625                  * The caller is expected trigger re-association with the
 626                  * Target AP.
 627                  */
 628                 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
 629         }
 630
 631         return 0;
 632 }
 633
 634
 635 int wpa_ft_is_completed(struct wpa_sm *sm)
 636 {
 637         if (sm == NULL)
 638                 return 0;
 639
 640         if (!wpa_key_mgmt_ft(sm->key_mgmt))
 641                 return 0;
 642
 643         return sm->ft_completed;
 644 }
 645
 646
 647 void wpa_reset_ft_completed(struct wpa_sm *sm)
 648 {
 649         if (sm != NULL)
 650                 sm->ft_completed = 0;
 651 }
 652
 653
 654 static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
 655                                       size_t gtk_elem_len)
 656 {
 657         u8 gtk[32];
 658         int keyidx;
 659         enum wpa_alg alg;
 660         size_t gtk_len, keylen, rsc_len;
 661         const u8 *kek;
 662         size_t kek_len;
 663
 664         if (wpa_key_mgmt_fils(sm->key_mgmt)) {
 665                 kek = sm->ptk.kek2;
 666                 kek_len = sm->ptk.kek2_len;
 667         } else {
 668                 kek = sm->ptk.kek;
 669                 kek_len = sm->ptk.kek_len;
 670         }
 671
 672         if (gtk_elem == NULL) {
 673                 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
 674                 return 0;
 675         }
 676
 677         wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
 678                         gtk_elem, gtk_elem_len);
 679
 680         if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
 681             gtk_elem_len - 19 > sizeof(gtk)) {
 682                 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
 683                            "length %lu", (unsigned long) gtk_elem_len);
 684                 return -1;
 685         }
 686         gtk_len = gtk_elem_len - 19;
 687         if (aes_unwrap(kek, kek_len, gtk_len / 8, gtk_elem + 11, gtk)) {
 688                 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
 689                            "decrypt GTK");
 690                 return -1;
 691         }
 692
 693         keylen = wpa_cipher_key_len(sm->group_cipher);
 694         rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
 695         alg = wpa_cipher_to_alg(sm->group_cipher);
 696         if (alg == WPA_ALG_NONE) {
 697                 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
 698                            sm->group_cipher);
 699                 return -1;
 700         }
 701
 702         if (gtk_len < keylen) {
 703                 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
 704                 return -1;
 705         }
 706
 707         /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
 708
 709         keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
 710
 711         if (gtk_elem[2] != keylen) {
 712                 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
 713                            "negotiated %lu",
 714                            gtk_elem[2], (unsigned long) keylen);
 715                 return -1;
 716         }
 717
 718         wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
 719         if (sm->group_cipher == WPA_CIPHER_TKIP) {
 720                 /* Swap Tx/Rx keys for Michael MIC */
 721                 u8 tmp[8];
 722                 os_memcpy(tmp, gtk + 16, 8);
 723                 os_memcpy(gtk + 16, gtk + 24, 8);
 724                 os_memcpy(gtk + 24, tmp, 8);
 725         }
 726         if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0,
 727                            gtk_elem + 3, rsc_len, gtk, keylen) < 0) {
 728                 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
 729                            "driver.");
 730                 return -1;
 731         }
 732
 733         return 0;
 734 }
 735
 736
 737 #ifdef CONFIG_IEEE80211W
 738 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
 739                                        size_t igtk_elem_len)
 740 {
 741         u8 igtk[WPA_IGTK_MAX_LEN];
 742         size_t igtk_len;
 743         u16 keyidx;
 744         const u8 *kek;
 745         size_t kek_len;
 746
 747         if (wpa_key_mgmt_fils(sm->key_mgmt)) {
 748                 kek = sm->ptk.kek2;
 749                 kek_len = sm->ptk.kek2_len;
 750         } else {
 751                 kek = sm->ptk.kek;
 752                 kek_len = sm->ptk.kek_len;
 753         }
 754
 755         if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC &&
 756             sm->mgmt_group_cipher != WPA_CIPHER_BIP_GMAC_128 &&
 757             sm->mgmt_group_cipher != WPA_CIPHER_BIP_GMAC_256 &&
 758             sm->mgmt_group_cipher != WPA_CIPHER_BIP_CMAC_256)
 759                 return 0;
 760
 761         if (igtk_elem == NULL) {
 762                 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
 763                 return 0;
 764         }
 765
 766         wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
 767                         igtk_elem, igtk_elem_len);
 768
 769         igtk_len = wpa_cipher_key_len(sm->mgmt_group_cipher);
 770         if (igtk_elem_len != 2 + 6 + 1 + igtk_len + 8) {
 771                 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
 772                            "length %lu", (unsigned long) igtk_elem_len);
 773                 return -1;
 774         }
 775         if (igtk_elem[8] != igtk_len) {
 776                 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
 777                            "%d", igtk_elem[8]);
 778                 return -1;
 779         }
 780
 781         if (aes_unwrap(kek, kek_len, igtk_len / 8, igtk_elem + 9, igtk)) {
 782                 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
 783                            "decrypt IGTK");
 784                 return -1;
 785         }
 786
 787         /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
 788
 789         keyidx = WPA_GET_LE16(igtk_elem);
 790
 791         wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
 792                         igtk_len);
 793         if (wpa_sm_set_key(sm, wpa_cipher_to_alg(sm->mgmt_group_cipher),
 794                            broadcast_ether_addr, keyidx, 0,
 795                            igtk_elem + 2, 6, igtk, igtk_len) < 0) {
 796                 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
 797                            "driver.");
 798                 os_memset(igtk, 0, sizeof(igtk));
 799                 return -1;
 800         }
 801         os_memset(igtk, 0, sizeof(igtk));
 802
 803         return 0;
 804 }
 805 #endif /* CONFIG_IEEE80211W */
 806
 807
 808 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
 809                                  size_t ies_len, const u8 *src_addr)
 810 {
 811         struct wpa_ft_ies parse;
 812         struct rsn_mdie *mdie;
 813         unsigned int count;
 814         u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
 815         const u8 *kck;
 816         size_t kck_len;
 817         int use_sha384 = wpa_key_mgmt_sha384(sm->key_mgmt);
 818         const u8 *anonce, *snonce, *fte_mic;
 819         u8 fte_elem_count;
 820
 821         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
 822
 823         if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
 824                 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
 825                            "enabled for this connection");
 826                 return -1;
 827         }
 828
 829         if (sm->ft_reassoc_completed) {
 830                 wpa_printf(MSG_DEBUG, "FT: Reassociation has already been completed for this FT protocol instance - ignore unexpected retransmission");
 831                 return 0;
 832         }
 833
 834         if (wpa_ft_parse_ies(ies, ies_len, &parse, use_sha384) < 0) {
 835                 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
 836                 return -1;
 837         }
 838
 839         mdie = (struct rsn_mdie *) parse.mdie;
 840         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 841             os_memcmp(mdie->mobility_domain, sm->mobility_domain,
 842                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 843                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 844                 return -1;
 845         }
 846
 847         if (use_sha384) {
 848                 struct rsn_ftie_sha384 *ftie;
 849
 850                 ftie = (struct rsn_ftie_sha384 *) parse.ftie;
 851                 if (!ftie || parse.ftie_len < sizeof(*ftie)) {
 852                         wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 853                         return -1;
 854                 }
 855
 856                 anonce = ftie->anonce;
 857                 snonce = ftie->snonce;
 858                 fte_elem_count = ftie->mic_control[1];
 859                 fte_mic = ftie->mic;
 860         } else {
 861                 struct rsn_ftie *ftie;
 862
 863                 ftie = (struct rsn_ftie *) parse.ftie;
 864                 if (!ftie || parse.ftie_len < sizeof(*ftie)) {
 865                         wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 866                         return -1;
 867                 }
 868
 869                 anonce = ftie->anonce;
 870                 snonce = ftie->snonce;
 871                 fte_elem_count = ftie->mic_control[1];
 872                 fte_mic = ftie->mic;
 873         }
 874
 875         if (os_memcmp(snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
 876                 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
 877                 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
 878                             snonce, WPA_NONCE_LEN);
 879                 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
 880                             sm->snonce, WPA_NONCE_LEN);
 881                 return -1;
 882         }
 883
 884         if (os_memcmp(anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
 885                 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
 886                 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
 887                             anonce, WPA_NONCE_LEN);
 888                 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
 889                             sm->anonce, WPA_NONCE_LEN);
 890                 return -1;
 891         }
 892
 893         if (parse.r0kh_id == NULL) {
 894                 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
 895                 return -1;
 896         }
 897
 898         if (parse.r0kh_id_len != sm->r0kh_id_len ||
 899             os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
 900         {
 901                 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
 902                            "the current R0KH-ID");
 903                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
 904                             parse.r0kh_id, parse.r0kh_id_len);
 905                 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
 906                             sm->r0kh_id, sm->r0kh_id_len);
 907                 return -1;
 908         }
 909
 910         if (parse.r1kh_id == NULL) {
 911                 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
 912                 return -1;
 913         }
 914
 915         if (os_memcmp_const(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
 916                 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
 917                            "ReassocResp");
 918                 return -1;
 919         }
 920
 921         if (parse.rsn_pmkid == NULL ||
 922             os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
 923         {
 924                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
 925                            "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
 926                 return -1;
 927         }
 928
 929         count = 3;
 930         if (parse.ric)
 931                 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
 932         if (fte_elem_count != count) {
 933                 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
 934                            "Control: received %u expected %u",
 935                            fte_elem_count, count);
 936                 return -1;
 937         }
 938
 939         if (wpa_key_mgmt_fils(sm->key_mgmt)) {
 940                 kck = sm->ptk.kck2;
 941                 kck_len = sm->ptk.kck2_len;
 942         } else {
 943                 kck = sm->ptk.kck;
 944                 kck_len = sm->ptk.kck_len;
 945         }
 946
 947         if (wpa_ft_mic(kck, kck_len, sm->own_addr, src_addr, 6,
 948                        parse.mdie - 2, parse.mdie_len + 2,
 949                        parse.ftie - 2, parse.ftie_len + 2,
 950                        parse.rsn - 2, parse.rsn_len + 2,
 951                        parse.ric, parse.ric_len,
 952                        mic) < 0) {
 953                 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
 954                 return -1;
 955         }
 956
 957         if (os_memcmp_const(mic, fte_mic, 16) != 0) {
 958                 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
 959                 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", fte_mic, 16);
 960                 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
 961                 return -1;
 962         }
 963
 964         sm->ft_reassoc_completed = 1;
 965
 966         if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
 967                 return -1;
 968
 969 #ifdef CONFIG_IEEE80211W
 970         if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
 971                 return -1;
 972 #endif /* CONFIG_IEEE80211W */
 973
 974         if (sm->set_ptk_after_assoc) {
 975                 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
 976                            "are associated");
 977                 if (wpa_ft_install_ptk(sm, src_addr) < 0)
 978                         return -1;
 979                 sm->set_ptk_after_assoc = 0;
 980         }
 981
 982         if (parse.ric) {
 983                 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
 984                             parse.ric, parse.ric_len);
 985                 /* TODO: parse response and inform driver about results when
 986                  * using wpa_supplicant SME */
 987         }
 988
 989         wpa_printf(MSG_DEBUG, "FT: Completed successfully");
 990
 991         return 0;
 992 }
 993
 994
 995 /**
 996  * wpa_ft_start_over_ds - Generate over-the-DS auth request
 997  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 998  * @target_ap: Target AP Address
 999  * @mdie: Mobility Domain IE from the target AP
1000  * Returns: 0 on success, -1 on failure
1001  */
1002 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
1003                          const u8 *mdie)
1004 {
1005         u8 *ft_ies;
1006         size_t ft_ies_len;
1007
1008         wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
1009                    MAC2STR(target_ap));
1010
1011         /* Generate a new SNonce */
1012         if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
1013                 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
1014                 return -1;
1015         }
1016
1017         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
1018                                     NULL, 0, target_ap, NULL, 0, mdie);
1019         if (ft_ies) {
1020                 sm->over_the_ds_in_progress = 1;
1021                 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
1022                 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
1023                 os_free(ft_ies);
1024         }
1025
1026         return 0;
1027 }
1028
1029 #endif /* CONFIG_IEEE80211R */