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 "common/ieee802_11_defs.h"
  20 #include "common/ieee802_11_common.h"
  21 #include "wpa.h"
  22 #include "wpa_i.h"
  23 #include "wpa_ie.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 ptk_name[WPA_PMK_NAME_LEN];
  32         const u8 *anonce = key->key_nonce;
  33
  34         if (sm->xxkey_len == 0) {
  35                 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
  36                            "derivation");
  37                 return -1;
  38         }
  39
  40         wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid,
  41                           sm->ssid_len, sm->mobility_domain,
  42                           sm->r0kh_id, sm->r0kh_id_len, sm->own_addr,
  43                           sm->pmk_r0, sm->pmk_r0_name);
  44         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, PMK_LEN);
  45         wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name",
  46                     sm->pmk_r0_name, WPA_PMK_NAME_LEN);
  47         wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
  48                           sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
  49         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
  50         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
  51                     WPA_PMK_NAME_LEN);
  52         wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr,
  53                           sm->bssid, sm->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 + 1 octet)
  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                 sm->mdie_ft_capab = mobility_domain[MOBILITY_DOMAIN_ID_LEN];
  81                 wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x",
  82                            sm->mdie_ft_capab);
  83         } else if (sm)
  84                 os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);
  85
  86         if (sm && r0kh_id) {
  87                 if (r0kh_id_len > FT_R0KH_ID_MAX_LEN)
  88                         return -1;
  89                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", r0kh_id, r0kh_id_len);
  90                 os_memcpy(sm->r0kh_id, r0kh_id, r0kh_id_len);
  91                 sm->r0kh_id_len = r0kh_id_len;
  92         } else if (sm) {
  93                 /* FIX: When should R0KH-ID be cleared? We need to keep the
  94                  * old R0KH-ID in order to be able to use this during FT. */
  95                 /*
  96                  * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN);
  97                  * sm->r0kh_id_len = 0;
  98                  */
  99         }
 100
 101         if (sm && r1kh_id) {
 102                 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", r1kh_id, FT_R1KH_ID_LEN);
 103                 os_memcpy(sm->r1kh_id, r1kh_id, FT_R1KH_ID_LEN);
 104         } else if (sm)
 105                 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
 106
 107         return 0;
 108 }
 109
 110
 111 /**
 112  * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request
 113  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 114  * @len: Buffer for returning the length of the IEs
 115  * @anonce: ANonce or %NULL if not yet available
 116  * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List
 117  * @kck: 128-bit KCK for MIC or %NULL if no MIC is used
 118  * @target_ap: Target AP address
 119  * @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL
 120  * @ric_ies_len: Length of ric_ies buffer in octets
 121  * @ap_mdie: Mobility Domain IE from the target AP
 122  * Returns: Pointer to buffer with IEs or %NULL on failure
 123  *
 124  * Caller is responsible for freeing the returned buffer with os_free();
 125  */
 126 static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
 127                                const u8 *anonce, const u8 *pmk_name,
 128                                const u8 *kck, const u8 *target_ap,
 129                                const u8 *ric_ies, size_t ric_ies_len,
 130                                const u8 *ap_mdie)
 131 {
 132         size_t buf_len;
 133         u8 *buf, *pos, *ftie_len, *ftie_pos;
 134         struct rsn_mdie *mdie;
 135         struct rsn_ftie *ftie;
 136         struct rsn_ie_hdr *rsnie;
 137         u16 capab;
 138
 139         sm->ft_completed = 0;
 140
 141         buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
 142                 2 + sm->r0kh_id_len + ric_ies_len + 100;
 143         buf = os_zalloc(buf_len);
 144         if (buf == NULL)
 145                 return NULL;
 146         pos = buf;
 147
 148         /* RSNIE[PMKR0Name/PMKR1Name] */
 149         rsnie = (struct rsn_ie_hdr *) pos;
 150         rsnie->elem_id = WLAN_EID_RSN;
 151         WPA_PUT_LE16(rsnie->version, RSN_VERSION);
 152         pos = (u8 *) (rsnie + 1);
 153
 154         /* Group Suite Selector */
 155         if (sm->group_cipher == WPA_CIPHER_CCMP)
 156                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
 157         else if (sm->group_cipher == WPA_CIPHER_TKIP)
 158                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
 159         else {
 160                 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
 161                            sm->group_cipher);
 162                 os_free(buf);
 163                 return NULL;
 164         }
 165         pos += RSN_SELECTOR_LEN;
 166
 167         /* Pairwise Suite Count */
 168         WPA_PUT_LE16(pos, 1);
 169         pos += 2;
 170
 171         /* Pairwise Suite List */
 172         if (sm->pairwise_cipher == WPA_CIPHER_CCMP)
 173                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
 174         else if (sm->pairwise_cipher == WPA_CIPHER_TKIP)
 175                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
 176         else {
 177                 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
 178                            sm->pairwise_cipher);
 179                 os_free(buf);
 180                 return NULL;
 181         }
 182         pos += RSN_SELECTOR_LEN;
 183
 184         /* Authenticated Key Management Suite Count */
 185         WPA_PUT_LE16(pos, 1);
 186         pos += 2;
 187
 188         /* Authenticated Key Management Suite List */
 189         if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
 190                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
 191         else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
 192                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
 193         else {
 194                 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
 195                            sm->key_mgmt);
 196                 os_free(buf);
 197                 return NULL;
 198         }
 199         pos += RSN_SELECTOR_LEN;
 200
 201         /* RSN Capabilities */
 202         capab = 0;
 203 #ifdef CONFIG_IEEE80211W
 204         if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
 205                 capab |= WPA_CAPABILITY_MFPC;
 206 #endif /* CONFIG_IEEE80211W */
 207         WPA_PUT_LE16(pos, capab);
 208         pos += 2;
 209
 210         /* PMKID Count */
 211         WPA_PUT_LE16(pos, 1);
 212         pos += 2;
 213
 214         /* PMKID List [PMKR0Name/PMKR1Name] */
 215         os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
 216         pos += WPA_PMK_NAME_LEN;
 217
 218 #ifdef CONFIG_IEEE80211W
 219         if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
 220                 /* Management Group Cipher Suite */
 221                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
 222                 pos += RSN_SELECTOR_LEN;
 223         }
 224 #endif /* CONFIG_IEEE80211W */
 225
 226         rsnie->len = (pos - (u8 *) rsnie) - 2;
 227
 228         /* MDIE */
 229         *pos++ = WLAN_EID_MOBILITY_DOMAIN;
 230         *pos++ = sizeof(*mdie);
 231         mdie = (struct rsn_mdie *) pos;
 232         pos += sizeof(*mdie);
 233         os_memcpy(mdie->mobility_domain, sm->mobility_domain,
 234                   MOBILITY_DOMAIN_ID_LEN);
 235         mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
 236                 sm->mdie_ft_capab;
 237
 238         /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
 239         ftie_pos = pos;
 240         *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
 241         ftie_len = pos++;
 242         ftie = (struct rsn_ftie *) pos;
 243         pos += sizeof(*ftie);
 244         os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
 245         if (anonce)
 246                 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
 247         if (kck) {
 248                 /* R1KH-ID sub-element in third FT message */
 249                 *pos++ = FTIE_SUBELEM_R1KH_ID;
 250                 *pos++ = FT_R1KH_ID_LEN;
 251                 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
 252                 pos += FT_R1KH_ID_LEN;
 253         }
 254         /* R0KH-ID sub-element */
 255         *pos++ = FTIE_SUBELEM_R0KH_ID;
 256         *pos++ = sm->r0kh_id_len;
 257         os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
 258         pos += sm->r0kh_id_len;
 259         *ftie_len = pos - ftie_len - 1;
 260
 261         if (ric_ies) {
 262                 /* RIC Request */
 263                 os_memcpy(pos, ric_ies, ric_ies_len);
 264                 pos += ric_ies_len;
 265         }
 266
 267         if (kck) {
 268                 /*
 269                  * IEEE Std 802.11r-2008, 11A.8.4
 270                  * MIC shall be calculated over:
 271                  * non-AP STA MAC address
 272                  * Target AP MAC address
 273                  * Transaction seq number (5 for ReassocReq, 3 otherwise)
 274                  * RSN IE
 275                  * MDIE
 276                  * FTIE (with MIC field set to 0)
 277                  * RIC-Request (if present)
 278                  */
 279                 /* Information element count */
 280                 ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies,
 281                                                                ric_ies_len);
 282                 if (wpa_ft_mic(kck, sm->own_addr, target_ap, 5,
 283                                ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
 284                                ftie_pos, 2 + *ftie_len,
 285                                (u8 *) rsnie, 2 + rsnie->len, ric_ies,
 286                                ric_ies_len, ftie->mic) < 0) {
 287                         wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
 288                         os_free(buf);
 289                         return NULL;
 290                 }
 291         }
 292
 293         *len = pos - buf;
 294
 295         return buf;
 296 }
 297
 298
 299 struct wpa_ft_ies {
 300         const u8 *mdie;
 301         size_t mdie_len;
 302         const u8 *ftie;
 303         size_t ftie_len;
 304         const u8 *r1kh_id;
 305         const u8 *gtk;
 306         size_t gtk_len;
 307         const u8 *r0kh_id;
 308         size_t r0kh_id_len;
 309         const u8 *rsn;
 310         size_t rsn_len;
 311         const u8 *rsn_pmkid;
 312         const u8 *tie;
 313         size_t tie_len;
 314         const u8 *igtk;
 315         size_t igtk_len;
 316         const u8 *ric;
 317         size_t ric_len;
 318 };
 319
 320
 321 static int wpa_ft_parse_ftie(const u8 *ie, size_t ie_len,
 322                              struct wpa_ft_ies *parse)
 323 {
 324         const u8 *end, *pos;
 325
 326         parse->ftie = ie;
 327         parse->ftie_len = ie_len;
 328
 329         pos = ie + sizeof(struct rsn_ftie);
 330         end = ie + ie_len;
 331
 332         while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
 333                 switch (pos[0]) {
 334                 case FTIE_SUBELEM_R1KH_ID:
 335                         if (pos[1] != FT_R1KH_ID_LEN) {
 336                                 wpa_printf(MSG_DEBUG, "FT: Invalid R1KH-ID "
 337                                            "length in FTIE: %d", pos[1]);
 338                                 return -1;
 339                         }
 340                         parse->r1kh_id = pos + 2;
 341                         break;
 342                 case FTIE_SUBELEM_GTK:
 343                         parse->gtk = pos + 2;
 344                         parse->gtk_len = pos[1];
 345                         break;
 346                 case FTIE_SUBELEM_R0KH_ID:
 347                         if (pos[1] < 1 || pos[1] > FT_R0KH_ID_MAX_LEN) {
 348                                 wpa_printf(MSG_DEBUG, "FT: Invalid R0KH-ID "
 349                                            "length in FTIE: %d", pos[1]);
 350                                 return -1;
 351                         }
 352                         parse->r0kh_id = pos + 2;
 353                         parse->r0kh_id_len = pos[1];
 354                         break;
 355 #ifdef CONFIG_IEEE80211W
 356                 case FTIE_SUBELEM_IGTK:
 357                         parse->igtk = pos + 2;
 358                         parse->igtk_len = pos[1];
 359                         break;
 360 #endif /* CONFIG_IEEE80211W */
 361                 }
 362
 363                 pos += 2 + pos[1];
 364         }
 365
 366         return 0;
 367 }
 368
 369
 370 static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len,
 371                             struct wpa_ft_ies *parse)
 372 {
 373         const u8 *end, *pos;
 374         struct wpa_ie_data data;
 375         int ret;
 376         const struct rsn_ftie *ftie;
 377         int prot_ie_count = 0;
 378
 379         os_memset(parse, 0, sizeof(*parse));
 380         if (ies == NULL)
 381                 return 0;
 382
 383         pos = ies;
 384         end = ies + ies_len;
 385         while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
 386                 switch (pos[0]) {
 387                 case WLAN_EID_RSN:
 388                         parse->rsn = pos + 2;
 389                         parse->rsn_len = pos[1];
 390                         ret = wpa_parse_wpa_ie_rsn(parse->rsn - 2,
 391                                                    parse->rsn_len + 2,
 392                                                    &data);
 393                         if (ret < 0) {
 394                                 wpa_printf(MSG_DEBUG, "FT: Failed to parse "
 395                                            "RSN IE: %d", ret);
 396                                 return -1;
 397                         }
 398                         if (data.num_pmkid == 1 && data.pmkid)
 399                                 parse->rsn_pmkid = data.pmkid;
 400                         break;
 401                 case WLAN_EID_MOBILITY_DOMAIN:
 402                         parse->mdie = pos + 2;
 403                         parse->mdie_len = pos[1];
 404                         break;
 405                 case WLAN_EID_FAST_BSS_TRANSITION:
 406                         if (pos[1] < sizeof(*ftie))
 407                                 return -1;
 408                         ftie = (const struct rsn_ftie *) (pos + 2);
 409                         prot_ie_count = ftie->mic_control[1];
 410                         if (wpa_ft_parse_ftie(pos + 2, pos[1], parse) < 0)
 411                                 return -1;
 412                         break;
 413                 case WLAN_EID_TIMEOUT_INTERVAL:
 414                         parse->tie = pos + 2;
 415                         parse->tie_len = pos[1];
 416                         break;
 417                 case WLAN_EID_RIC_DATA:
 418                         if (parse->ric == NULL)
 419                                 parse->ric = pos;
 420                 }
 421
 422                 pos += 2 + pos[1];
 423         }
 424
 425         if (prot_ie_count == 0)
 426                 return 0; /* no MIC */
 427
 428         /*
 429          * Check that the protected IE count matches with IEs included in the
 430          * frame.
 431          */
 432         if (parse->rsn)
 433                 prot_ie_count--;
 434         if (parse->mdie)
 435                 prot_ie_count--;
 436         if (parse->ftie)
 437                 prot_ie_count--;
 438         if (parse->tie)
 439                 prot_ie_count--;
 440         if (prot_ie_count < 0) {
 441                 wpa_printf(MSG_DEBUG, "FT: Some required IEs not included in "
 442                            "the protected IE count");
 443                 return -1;
 444         }
 445
 446         if (prot_ie_count == 0 && parse->ric) {
 447                 wpa_printf(MSG_DEBUG, "FT: RIC IE(s) in the frame, but not "
 448                            "included in protected IE count");
 449                 return -1;
 450         }
 451
 452         /* Determine the end of the RIC IE(s) */
 453         pos = parse->ric;
 454         while (pos && pos + 2 <= end && pos + 2 + pos[1] <= end &&
 455                prot_ie_count) {
 456                 prot_ie_count--;
 457                 pos += 2 + pos[1];
 458         }
 459         parse->ric_len = pos - parse->ric;
 460         if (prot_ie_count) {
 461                 wpa_printf(MSG_DEBUG, "FT: %d protected IEs missing from "
 462                            "frame", (int) prot_ie_count);
 463                 return -1;
 464         }
 465
 466         return 0;
 467 }
 468
 469
 470 static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
 471 {
 472         int keylen;
 473         enum wpa_alg alg;
 474         u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
 475
 476         wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
 477
 478         switch (sm->pairwise_cipher) {
 479         case WPA_CIPHER_CCMP:
 480                 alg = WPA_ALG_CCMP;
 481                 keylen = 16;
 482                 break;
 483         case WPA_CIPHER_TKIP:
 484                 alg = WPA_ALG_TKIP;
 485                 keylen = 32;
 486                 break;
 487         default:
 488                 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
 489                            sm->pairwise_cipher);
 490                 return -1;
 491         }
 492
 493         if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
 494                            sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) {
 495                 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
 496                 return -1;
 497         }
 498
 499         return 0;
 500 }
 501
 502
 503 /**
 504  * wpa_ft_prepare_auth_request - Generate over-the-air auth request
 505  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 506  * @mdie: Target AP MDIE
 507  * Returns: 0 on success, -1 on failure
 508  */
 509 int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
 510 {
 511         u8 *ft_ies;
 512         size_t ft_ies_len;
 513
 514         /* Generate a new SNonce */
 515         if (os_get_random(sm->snonce, WPA_NONCE_LEN)) {
 516                 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
 517                 return -1;
 518         }
 519
 520         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
 521                                     NULL, sm->bssid, NULL, 0, mdie);
 522         if (ft_ies) {
 523                 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
 524                                      ft_ies, ft_ies_len);
 525                 os_free(ft_ies);
 526         }
 527
 528         return 0;
 529 }
 530
 531
 532 int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
 533                             int ft_action, const u8 *target_ap,
 534                             const u8 *ric_ies, size_t ric_ies_len)
 535 {
 536         u8 *ft_ies;
 537         size_t ft_ies_len, ptk_len;
 538         struct wpa_ft_ies parse;
 539         struct rsn_mdie *mdie;
 540         struct rsn_ftie *ftie;
 541         u8 ptk_name[WPA_PMK_NAME_LEN];
 542         int ret;
 543         const u8 *bssid;
 544
 545         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
 546         wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
 547
 548         if (ft_action) {
 549                 if (!sm->over_the_ds_in_progress) {
 550                         wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
 551                                    "- drop FT Action Response");
 552                         return -1;
 553                 }
 554
 555                 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
 556                         wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
 557                                    "with this Target AP - drop FT Action "
 558                                    "Response");
 559                         return -1;
 560                 }
 561         }
 562
 563         if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
 564             sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
 565                 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
 566                            "enabled for this connection");
 567                 return -1;
 568         }
 569
 570         if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
 571                 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
 572                 return -1;
 573         }
 574
 575         mdie = (struct rsn_mdie *) parse.mdie;
 576         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 577             os_memcmp(mdie->mobility_domain, sm->mobility_domain,
 578                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 579                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 580                 return -1;
 581         }
 582
 583         ftie = (struct rsn_ftie *) parse.ftie;
 584         if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
 585                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 586                 return -1;
 587         }
 588
 589         if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
 590                 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
 591                 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
 592                             ftie->snonce, WPA_NONCE_LEN);
 593                 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
 594                             sm->snonce, WPA_NONCE_LEN);
 595                 return -1;
 596         }
 597
 598         if (parse.r0kh_id == NULL) {
 599                 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
 600                 return -1;
 601         }
 602
 603         if (parse.r0kh_id_len != sm->r0kh_id_len ||
 604             os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
 605                 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
 606                            "the current R0KH-ID");
 607                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
 608                             parse.r0kh_id, parse.r0kh_id_len);
 609                 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
 610                             sm->r0kh_id, sm->r0kh_id_len);
 611                 return -1;
 612         }
 613
 614         if (parse.r1kh_id == NULL) {
 615                 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
 616                 return -1;
 617         }
 618
 619         if (parse.rsn_pmkid == NULL ||
 620             os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) {
 621                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
 622                            "RSNIE");
 623                 return -1;
 624         }
 625
 626         os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
 627         wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
 628         wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
 629         wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN);
 630         os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN);
 631         wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
 632                           sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
 633         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
 634         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
 635                     sm->pmk_r1_name, WPA_PMK_NAME_LEN);
 636
 637         bssid = target_ap;
 638         ptk_len = sm->pairwise_cipher == WPA_CIPHER_CCMP ? 48 : 64;
 639         wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr,
 640                           bssid, sm->pmk_r1_name,
 641                           (u8 *) &sm->ptk, ptk_len, ptk_name);
 642         wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
 643                         (u8 *) &sm->ptk, ptk_len);
 644         wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
 645
 646         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
 647                                     sm->pmk_r1_name, sm->ptk.kck, bssid,
 648                                     ric_ies, ric_ies_len,
 649                                     parse.mdie ? parse.mdie - 2 : NULL);
 650         if (ft_ies) {
 651                 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
 652                                      ft_ies, ft_ies_len);
 653                 os_free(ft_ies);
 654         }
 655
 656         wpa_sm_mark_authenticated(sm, bssid);
 657         ret = wpa_ft_install_ptk(sm, bssid);
 658         if (ret) {
 659                 /*
 660                  * Some drivers do not support key configuration when we are
 661                  * not associated with the target AP. Work around this by
 662                  * trying again after the following reassociation gets
 663                  * completed.
 664                  */
 665                 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
 666                            "association - try again after reassociation");
 667                 sm->set_ptk_after_assoc = 1;
 668         } else
 669                 sm->set_ptk_after_assoc = 0;
 670
 671         sm->ft_completed = 1;
 672         if (ft_action) {
 673                 /*
 674                  * The caller is expected trigger re-association with the
 675                  * Target AP.
 676                  */
 677                 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
 678         }
 679
 680         return 0;
 681 }
 682
 683
 684 int wpa_ft_is_completed(struct wpa_sm *sm)
 685 {
 686         if (sm == NULL)
 687                 return 0;
 688
 689         if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
 690             sm->key_mgmt != WPA_KEY_MGMT_FT_PSK)
 691                 return 0;
 692
 693         return sm->ft_completed;
 694 }
 695
 696
 697 static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
 698                                       size_t gtk_elem_len)
 699 {
 700         u8 gtk[32];
 701         int keyidx;
 702         enum wpa_alg alg;
 703         size_t gtk_len, keylen, rsc_len;
 704
 705         if (gtk_elem == NULL) {
 706                 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
 707                 return 0;
 708         }
 709
 710         wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
 711                         gtk_elem, gtk_elem_len);
 712
 713         if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
 714             gtk_elem_len - 19 > sizeof(gtk)) {
 715                 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
 716                            "length %lu", (unsigned long) gtk_elem_len);
 717                 return -1;
 718         }
 719         gtk_len = gtk_elem_len - 19;
 720         if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 11, gtk)) {
 721                 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
 722                            "decrypt GTK");
 723                 return -1;
 724         }
 725
 726         switch (sm->group_cipher) {
 727         case WPA_CIPHER_CCMP:
 728                 keylen = 16;
 729                 rsc_len = 6;
 730                 alg = WPA_ALG_CCMP;
 731                 break;
 732         case WPA_CIPHER_TKIP:
 733                 keylen = 32;
 734                 rsc_len = 6;
 735                 alg = WPA_ALG_TKIP;
 736                 break;
 737         case WPA_CIPHER_WEP104:
 738                 keylen = 13;
 739                 rsc_len = 0;
 740                 alg = WPA_ALG_WEP;
 741                 break;
 742         case WPA_CIPHER_WEP40:
 743                 keylen = 5;
 744                 rsc_len = 0;
 745                 alg = WPA_ALG_WEP;
 746                 break;
 747         default:
 748                 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
 749                            sm->group_cipher);
 750                 return -1;
 751         }
 752
 753         if (gtk_len < keylen) {
 754                 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
 755                 return -1;
 756         }
 757
 758         /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
 759
 760         keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
 761
 762         if (gtk_elem[2] != keylen) {
 763                 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
 764                            "negotiated %lu",
 765                            gtk_elem[2], (unsigned long) keylen);
 766                 return -1;
 767         }
 768
 769         wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
 770         if (wpa_sm_set_key(sm, alg, (u8 *) "\xff\xff\xff\xff\xff\xff",
 771                            keyidx, 0, gtk_elem + 3, rsc_len, gtk, keylen) <
 772             0) {
 773                 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
 774                            "driver.");
 775                 return -1;
 776         }
 777
 778         return 0;
 779 }
 780
 781
 782 #ifdef CONFIG_IEEE80211W
 783 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
 784                                        size_t igtk_elem_len)
 785 {
 786         u8 igtk[WPA_IGTK_LEN];
 787         u16 keyidx;
 788
 789         if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
 790                 return 0;
 791
 792         if (igtk_elem == NULL) {
 793                 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
 794                 return 0;
 795         }
 796
 797         wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
 798                         igtk_elem, igtk_elem_len);
 799
 800         if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
 801                 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
 802                            "length %lu", (unsigned long) igtk_elem_len);
 803                 return -1;
 804         }
 805         if (igtk_elem[8] != WPA_IGTK_LEN) {
 806                 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
 807                            "%d", igtk_elem[8]);
 808                 return -1;
 809         }
 810
 811         if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) {
 812                 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
 813                            "decrypt IGTK");
 814                 return -1;
 815         }
 816
 817         /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
 818
 819         keyidx = WPA_GET_LE16(igtk_elem);
 820
 821         wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
 822                         WPA_IGTK_LEN);
 823         if (wpa_sm_set_key(sm, WPA_ALG_IGTK, (u8 *) "\xff\xff\xff\xff\xff\xff",
 824                            keyidx, 0, igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) <
 825             0) {
 826                 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
 827                            "driver.");
 828                 return -1;
 829         }
 830
 831         return 0;
 832 }
 833 #endif /* CONFIG_IEEE80211W */
 834
 835
 836 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
 837                                  size_t ies_len, const u8 *src_addr)
 838 {
 839         struct wpa_ft_ies parse;
 840         struct rsn_mdie *mdie;
 841         struct rsn_ftie *ftie;
 842         size_t count;
 843         u8 mic[16];
 844
 845         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
 846
 847         if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
 848             sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
 849                 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
 850                            "enabled for this connection");
 851                 return -1;
 852         }
 853
 854         if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
 855                 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
 856                 return -1;
 857         }
 858
 859         mdie = (struct rsn_mdie *) parse.mdie;
 860         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 861             os_memcmp(mdie->mobility_domain, sm->mobility_domain,
 862                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 863                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 864                 return -1;
 865         }
 866
 867         ftie = (struct rsn_ftie *) parse.ftie;
 868         if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
 869                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 870                 return -1;
 871         }
 872
 873         if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
 874                 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
 875                 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
 876                             ftie->snonce, WPA_NONCE_LEN);
 877                 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
 878                             sm->snonce, WPA_NONCE_LEN);
 879                 return -1;
 880         }
 881
 882         if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
 883                 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
 884                 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
 885                             ftie->anonce, WPA_NONCE_LEN);
 886                 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
 887                             sm->anonce, WPA_NONCE_LEN);
 888                 return -1;
 889         }
 890
 891         if (parse.r0kh_id == NULL) {
 892                 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
 893                 return -1;
 894         }
 895
 896         if (parse.r0kh_id_len != sm->r0kh_id_len ||
 897             os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
 898                 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
 899                            "the current R0KH-ID");
 900                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
 901                             parse.r0kh_id, parse.r0kh_id_len);
 902                 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
 903                             sm->r0kh_id, sm->r0kh_id_len);
 904                 return -1;
 905         }
 906
 907         if (parse.r1kh_id == NULL) {
 908                 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
 909                 return -1;
 910         }
 911
 912         if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
 913                 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
 914                            "ReassocResp");
 915                 return -1;
 916         }
 917
 918         if (parse.rsn_pmkid == NULL ||
 919             os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) {
 920                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
 921                            "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
 922                 return -1;
 923         }
 924
 925         count = 3;
 926         if (parse.tie)
 927                 count++;
 928
 929         if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6,
 930                        parse.mdie - 2, parse.mdie_len + 2,
 931                        parse.ftie - 2, parse.ftie_len + 2,
 932                        parse.rsn - 2, parse.rsn_len + 2,
 933                        parse.ric, parse.ric_len,
 934                        mic) < 0) {
 935                 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
 936                 return -1;
 937         }
 938
 939         if (os_memcmp(mic, ftie->mic, 16) != 0) {
 940                 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
 941                 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
 942                 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
 943                 return -1;
 944         }
 945
 946         if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
 947                 return -1;
 948
 949 #ifdef CONFIG_IEEE80211W
 950         if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
 951                 return -1;
 952 #endif /* CONFIG_IEEE80211W */
 953
 954         if (sm->set_ptk_after_assoc) {
 955                 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
 956                            "are associated");
 957                 if (wpa_ft_install_ptk(sm, src_addr) < 0)
 958                         return -1;
 959                 sm->set_ptk_after_assoc = 0;
 960         }
 961
 962         if (parse.ric) {
 963                 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
 964                             parse.ric, parse.ric_len);
 965                 /* TODO: parse response and inform driver about results */
 966         }
 967
 968         return 0;
 969 }
 970
 971
 972 /**
 973  * wpa_ft_start_over_ds - Generate over-the-DS auth request
 974  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 975  * @target_ap: Target AP Address
 976  * @mdie: Mobility Domain IE from the target AP
 977  * Returns: 0 on success, -1 on failure
 978  */
 979 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
 980                          const u8 *mdie)
 981 {
 982         u8 *ft_ies;
 983         size_t ft_ies_len;
 984
 985         wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
 986                    MAC2STR(target_ap));
 987
 988         /* Generate a new SNonce */
 989         if (os_get_random(sm->snonce, WPA_NONCE_LEN)) {
 990                 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
 991                 return -1;
 992         }
 993
 994         ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
 995                                     NULL, target_ap, NULL, 0, mdie);
 996         if (ft_ies) {
 997                 sm->over_the_ds_in_progress = 1;
 998                 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
 999                 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
1000                 os_free(ft_ies);
1001         }
1002
1003         return 0;
1004 }
1005
1006 #endif /* CONFIG_IEEE80211R */