hostapd/wpa_ft.c

   1 /*
   2  * hostapd - IEEE 802.11r - Fast BSS Transition
   3  * Copyright (c) 2004-2007, 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 "config.h"
  19 #include "wpa.h"
  20 #include "aes_wrap.h"
  21 #include "ieee802_11.h"
  22 #include "defs.h"
  23 #include "wpa_auth_i.h"
  24 #include "wpa_auth_ie.h"
  25
  26
  27 #ifdef CONFIG_IEEE80211R
  28
  29 static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst,
  30                            const u8 *data, size_t data_len)
  31 {
  32         if (wpa_auth->cb.send_ether == NULL)
  33                 return -1;
  34         return wpa_auth->cb.send_ether(wpa_auth->cb.ctx, dst, ETH_P_RRB,
  35                                        data, data_len);
  36 }
  37
  38
  39 static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth,
  40                               const u8 *dst, const u8 *data, size_t data_len)
  41 {
  42         if (wpa_auth->cb.send_ft_action == NULL)
  43                 return -1;
  44         return wpa_auth->cb.send_ft_action(wpa_auth->cb.ctx, dst,
  45                                            data, data_len);
  46 }
  47
  48
  49 static struct wpa_state_machine *
  50 wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr)
  51 {
  52         if (wpa_auth->cb.add_sta == NULL)
  53                 return NULL;
  54         return wpa_auth->cb.add_sta(wpa_auth->cb.ctx, sta_addr);
  55 }
  56
  57
  58 int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len)
  59 {
  60         u8 *pos = buf;
  61         u8 capab;
  62         if (len < 2 + sizeof(struct rsn_mdie))
  63                 return -1;
  64
  65         *pos++ = WLAN_EID_MOBILITY_DOMAIN;
  66         *pos++ = MOBILITY_DOMAIN_ID_LEN + 1;
  67         os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN);
  68         pos += MOBILITY_DOMAIN_ID_LEN;
  69         capab = RSN_FT_CAPAB_FT_OVER_DS;
  70         *pos++ = capab;
  71
  72         return pos - buf;
  73 }
  74
  75
  76 static int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id,
  77                           size_t r0kh_id_len,
  78                           const u8 *anonce, const u8 *snonce,
  79                           u8 *buf, size_t len, const u8 *subelem,
  80                           size_t subelem_len)
  81 {
  82         u8 *pos = buf, *ielen;
  83         struct rsn_ftie *hdr;
  84
  85         if (len < 2 + sizeof(*hdr) + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len +
  86             subelem_len)
  87                 return -1;
  88
  89         *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
  90         ielen = pos++;
  91
  92         hdr = (struct rsn_ftie *) pos;
  93         os_memset(hdr, 0, sizeof(*hdr));
  94         pos += sizeof(*hdr);
  95         WPA_PUT_LE16(hdr->mic_control, 0);
  96         if (anonce)
  97                 os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
  98         if (snonce)
  99                 os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
 100
 101         /* Optional Parameters */
 102         *pos++ = FTIE_SUBELEM_R1KH_ID;
 103         *pos++ = FT_R1KH_ID_LEN;
 104         os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN);
 105         pos += FT_R1KH_ID_LEN;
 106
 107         if (r0kh_id) {
 108                 *pos++ = FTIE_SUBELEM_R0KH_ID;
 109                 *pos++ = r0kh_id_len;
 110                 os_memcpy(pos, r0kh_id, r0kh_id_len);
 111                 pos += r0kh_id_len;
 112         }
 113
 114         if (subelem) {
 115                 os_memcpy(pos, subelem, subelem_len);
 116                 pos += subelem_len;
 117         }
 118
 119         *ielen = pos - buf - 2;
 120
 121         return pos - buf;
 122 }
 123
 124
 125 struct wpa_ft_pmk_r0_sa {
 126         struct wpa_ft_pmk_r0_sa *next;
 127         u8 pmk_r0[PMK_LEN];
 128         u8 pmk_r0_name[WPA_PMK_NAME_LEN];
 129         u8 spa[ETH_ALEN];
 130         /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
 131         int pmk_r1_pushed;
 132 };
 133
 134 struct wpa_ft_pmk_r1_sa {
 135         struct wpa_ft_pmk_r1_sa *next;
 136         u8 pmk_r1[PMK_LEN];
 137         u8 pmk_r1_name[WPA_PMK_NAME_LEN];
 138         u8 spa[ETH_ALEN];
 139         /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
 140 };
 141
 142 struct wpa_ft_pmk_cache {
 143         struct wpa_ft_pmk_r0_sa *pmk_r0;
 144         struct wpa_ft_pmk_r1_sa *pmk_r1;
 145 };
 146
 147 struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void)
 148 {
 149         struct wpa_ft_pmk_cache *cache;
 150
 151         cache = os_zalloc(sizeof(*cache));
 152
 153         return cache;
 154 }
 155
 156
 157 void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache)
 158 {
 159         struct wpa_ft_pmk_r0_sa *r0, *r0prev;
 160         struct wpa_ft_pmk_r1_sa *r1, *r1prev;
 161
 162         r0 = cache->pmk_r0;
 163         while (r0) {
 164                 r0prev = r0;
 165                 r0 = r0->next;
 166                 os_memset(r0prev->pmk_r0, 0, PMK_LEN);
 167                 os_free(r0prev);
 168         }
 169
 170         r1 = cache->pmk_r1;
 171         while (r1) {
 172                 r1prev = r1;
 173                 r1 = r1->next;
 174                 os_memset(r1prev->pmk_r1, 0, PMK_LEN);
 175                 os_free(r1prev);
 176         }
 177
 178         os_free(cache);
 179 }
 180
 181
 182 static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
 183                                const u8 *spa, const u8 *pmk_r0,
 184                                const u8 *pmk_r0_name)
 185 {
 186         struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
 187         struct wpa_ft_pmk_r0_sa *r0;
 188
 189         /* TODO: add expiration and limit on number of entries in cache */
 190
 191         r0 = os_zalloc(sizeof(*r0));
 192         if (r0 == NULL)
 193                 return -1;
 194
 195         os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN);
 196         os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
 197         os_memcpy(r0->spa, spa, ETH_ALEN);
 198
 199         r0->next = cache->pmk_r0;
 200         cache->pmk_r0 = r0;
 201
 202         return 0;
 203 }
 204
 205
 206 static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth,
 207                                const u8 *spa, const u8 *pmk_r0_name,
 208                                u8 *pmk_r0)
 209 {
 210         struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
 211         struct wpa_ft_pmk_r0_sa *r0;
 212
 213         r0 = cache->pmk_r0;
 214         while (r0) {
 215                 if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 &&
 216                     os_memcmp(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN)
 217                     == 0) {
 218                         os_memcpy(pmk_r0, r0->pmk_r0, PMK_LEN);
 219                         return 0;
 220                 }
 221
 222                 r0 = r0->next;
 223         }
 224
 225         return -1;
 226 }
 227
 228
 229 static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
 230                                const u8 *spa, const u8 *pmk_r1,
 231                                const u8 *pmk_r1_name)
 232 {
 233         struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
 234         struct wpa_ft_pmk_r1_sa *r1;
 235
 236         /* TODO: add expiration and limit on number of entries in cache */
 237
 238         r1 = os_zalloc(sizeof(*r1));
 239         if (r1 == NULL)
 240                 return -1;
 241
 242         os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN);
 243         os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
 244         os_memcpy(r1->spa, spa, ETH_ALEN);
 245
 246         r1->next = cache->pmk_r1;
 247         cache->pmk_r1 = r1;
 248
 249         return 0;
 250 }
 251
 252
 253 static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
 254                                const u8 *spa, const u8 *pmk_r1_name,
 255                                u8 *pmk_r1)
 256 {
 257         struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
 258         struct wpa_ft_pmk_r1_sa *r1;
 259
 260         r1 = cache->pmk_r1;
 261         while (r1) {
 262                 if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 &&
 263                     os_memcmp(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN)
 264                     == 0) {
 265                         os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN);
 266                         return 0;
 267                 }
 268
 269                 r1 = r1->next;
 270         }
 271
 272         return -1;
 273 }
 274
 275
 276 static int wpa_ft_pull_pmk_r1(struct wpa_authenticator *wpa_auth,
 277                               const u8 *s1kh_id, const u8 *r0kh_id,
 278                               size_t r0kh_id_len, const u8 *pmk_r0_name)
 279 {
 280         struct ft_remote_r0kh *r0kh;
 281         struct ft_r0kh_r1kh_pull_frame frame, f;
 282
 283         r0kh = wpa_auth->conf.r0kh_list;
 284         while (r0kh) {
 285                 if (r0kh->id_len == r0kh_id_len &&
 286                     os_memcmp(r0kh->id, r0kh_id, r0kh_id_len) == 0)
 287                         break;
 288                 r0kh = r0kh->next;
 289         }
 290         if (r0kh == NULL)
 291                 return -1;
 292
 293         wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH "
 294                    "address " MACSTR, MAC2STR(r0kh->addr));
 295
 296         os_memset(&frame, 0, sizeof(frame));
 297         frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
 298         frame.packet_type = FT_PACKET_R0KH_R1KH_PULL;
 299         frame.data_length = host_to_le16(FT_R0KH_R1KH_PULL_DATA_LEN);
 300         os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);
 301
 302         /* aes_wrap() does not support inplace encryption, so use a temporary
 303          * buffer for the data. */
 304         if (os_get_random(f.nonce, sizeof(f.nonce))) {
 305                 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
 306                            "nonce");
 307                 return -1;
 308         }
 309         os_memcpy(f.pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
 310         os_memcpy(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
 311         os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
 312
 313         if (aes_wrap(r0kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
 314                      f.nonce, frame.nonce) < 0)
 315                 return -1;
 316
 317         wpa_ft_rrb_send(wpa_auth, r0kh->addr, (u8 *) &frame, sizeof(frame));
 318
 319         return 0;
 320 }
 321
 322
 323 int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
 324                            struct wpa_ptk *ptk)
 325 {
 326         u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
 327         u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
 328         u8 ptk_name[WPA_PMK_NAME_LEN];
 329         const u8 *mdid = sm->wpa_auth->conf.mobility_domain;
 330         const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder;
 331         size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len;
 332         const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder;
 333         const u8 *ssid = sm->wpa_auth->conf.ssid;
 334         size_t ssid_len = sm->wpa_auth->conf.ssid_len;
 335
 336
 337         if (sm->xxkey_len == 0) {
 338                 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
 339                            "derivation");
 340                 return -1;
 341         }
 342
 343         wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid,
 344                           r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name);
 345         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN);
 346         wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN);
 347         wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name);
 348
 349         wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
 350                           pmk_r1, pmk_r1_name);
 351         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN);
 352         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", pmk_r1_name, WPA_PMK_NAME_LEN);
 353         wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, pmk_r1_name);
 354
 355         wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
 356                           sm->wpa_auth->addr, pmk_r1_name,
 357                           (u8 *) ptk, sizeof(*ptk), ptk_name);
 358         wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, sizeof(*ptk));
 359         wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
 360
 361         return 0;
 362 }
 363
 364
 365 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
 366                                       const u8 *addr, int idx, u8 *seq)
 367 {
 368         if (wpa_auth->cb.get_seqnum == NULL)
 369                 return -1;
 370         return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
 371 }
 372
 373
 374 static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len)
 375 {
 376         u8 *subelem;
 377         struct wpa_group *gsm = sm->group;
 378         size_t subelem_len, pad_len;
 379         const u8 *key;
 380         size_t key_len;
 381         u8 keybuf[32];
 382
 383         key_len = gsm->GTK_len;
 384         if (key_len > sizeof(keybuf))
 385                 return NULL;
 386
 387         /*
 388          * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less
 389          * than 16 bytes.
 390          */
 391         pad_len = key_len % 8;
 392         if (pad_len)
 393                 pad_len = 8 - pad_len;
 394         if (key_len + pad_len < 16)
 395                 pad_len += 8;
 396         if (pad_len) {
 397                 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
 398                 os_memset(keybuf + key_len, 0, pad_len);
 399                 keybuf[key_len] = 0xdd;
 400                 key_len += pad_len;
 401                 key = keybuf;
 402         } else
 403                 key = gsm->GTK[gsm->GN - 1];
 404
 405         /*
 406          * Sub-elem ID[1] | Length[1] | Key Info[1] | Key Length[1] | RSC[8] |
 407          * Key[5..32].
 408          */
 409         subelem_len = 12 + key_len + 8;
 410         subelem = os_zalloc(subelem_len);
 411         if (subelem == NULL)
 412                 return NULL;
 413
 414         subelem[0] = FTIE_SUBELEM_GTK;
 415         subelem[1] = 10 + key_len + 8;
 416         subelem[2] = gsm->GN & 0x03; /* Key ID in B0-B1 of Key Info */
 417         subelem[3] = gsm->GTK_len;
 418         wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 4);
 419         if (aes_wrap(sm->PTK.kek, key_len / 8, key, subelem + 12)) {
 420                 os_free(subelem);
 421                 return NULL;
 422         }
 423
 424         *len = subelem_len;
 425         return subelem;
 426 }
 427
 428
 429 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
 430                                  size_t max_len, int auth_alg)
 431 {
 432         u8 *end, *mdie, *ftie, *rsnie, *r0kh_id, *subelem = NULL;
 433         size_t mdie_len, ftie_len, rsnie_len, r0kh_id_len, subelem_len = 0;
 434         int res;
 435         struct wpa_auth_config *conf;
 436         struct rsn_ftie *_ftie;
 437
 438         if (sm == NULL)
 439                 return pos;
 440
 441         conf = &sm->wpa_auth->conf;
 442
 443         if (sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
 444             sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_PSK)
 445                 return pos;
 446
 447         end = pos + max_len;
 448
 449         /* RSN */
 450         res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name);
 451         if (res < 0)
 452                 return pos;
 453         rsnie = pos;
 454         rsnie_len = res;
 455         pos += res;
 456
 457         /* Mobility Domain Information */
 458         res = wpa_write_mdie(conf, pos, end - pos);
 459         if (res < 0)
 460                 return pos;
 461         mdie = pos;
 462         mdie_len = res;
 463         pos += res;
 464
 465         /* Fast BSS Transition Information */
 466         if (auth_alg == WLAN_AUTH_FT) {
 467                 subelem = wpa_ft_gtk_subelem(sm, &subelem_len);
 468                 r0kh_id = sm->r0kh_id;
 469                 r0kh_id_len = sm->r0kh_id_len;
 470         } else {
 471                 r0kh_id = conf->r0_key_holder;
 472                 r0kh_id_len = conf->r0_key_holder_len;
 473         }
 474         res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, NULL, NULL, pos,
 475                              end - pos, subelem, subelem_len);
 476         os_free(subelem);
 477         if (res < 0)
 478                 return pos;
 479         ftie = pos;
 480         ftie_len = res;
 481         pos += res;
 482
 483         _ftie = (struct rsn_ftie *) (ftie + 2);
 484         _ftie->mic_control[1] = 3; /* Information element count */
 485         if (wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 6,
 486                        mdie, mdie_len, ftie, ftie_len,
 487                        rsnie, rsnie_len, NULL, 0, _ftie->mic) < 0)
 488                 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
 489
 490         return pos;
 491 }
 492
 493
 494 struct wpa_ft_ies {
 495         const u8 *mdie;
 496         size_t mdie_len;
 497         const u8 *ftie;
 498         size_t ftie_len;
 499         const u8 *r1kh_id;
 500         const u8 *gtk;
 501         size_t gtk_len;
 502         const u8 *r0kh_id;
 503         size_t r0kh_id_len;
 504         const u8 *rsn;
 505         size_t rsn_len;
 506         const u8 *rsn_pmkid;
 507 };
 508
 509
 510 static int wpa_ft_parse_ftie(const u8 *ie, size_t ie_len,
 511                              struct wpa_ft_ies *parse)
 512 {
 513         const u8 *end, *pos;
 514
 515         parse->ftie = ie;
 516         parse->ftie_len = ie_len;
 517
 518         pos = ie + sizeof(struct rsn_ftie);
 519         end = ie + ie_len;
 520
 521         while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
 522                 switch (pos[0]) {
 523                 case FTIE_SUBELEM_R1KH_ID:
 524                         if (pos[1] != FT_R1KH_ID_LEN) {
 525                                 wpa_printf(MSG_DEBUG, "FT: Invalid R1KH-ID "
 526                                            "length in FTIE: %d", pos[1]);
 527                                 return -1;
 528                         }
 529                         parse->r1kh_id = pos + 2;
 530                         break;
 531                 case FTIE_SUBELEM_GTK:
 532                         parse->gtk = pos + 2;
 533                         parse->gtk_len = pos[1];
 534                         break;
 535                 case FTIE_SUBELEM_R0KH_ID:
 536                         if (pos[1] < 1 || pos[1] > FT_R0KH_ID_MAX_LEN) {
 537                                 wpa_printf(MSG_DEBUG, "FT: Invalid R0KH-ID "
 538                                            "length in FTIE: %d", pos[1]);
 539                                 return -1;
 540                         }
 541                         parse->r0kh_id = pos + 2;
 542                         parse->r0kh_id_len = pos[1];
 543                         break;
 544                 }
 545
 546                 pos += 2 + pos[1];
 547         }
 548
 549         return 0;
 550 }
 551
 552
 553 static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len,
 554                             struct wpa_ft_ies *parse)
 555 {
 556         const u8 *end, *pos;
 557         struct wpa_ie_data data;
 558         int ret;
 559
 560         os_memset(parse, 0, sizeof(*parse));
 561         if (ies == NULL)
 562                 return 0;
 563
 564         pos = ies;
 565         end = ies + ies_len;
 566         while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
 567                 switch (pos[0]) {
 568                 case WLAN_EID_RSN:
 569                         parse->rsn = pos + 2;
 570                         parse->rsn_len = pos[1];
 571                         ret = wpa_parse_wpa_ie_rsn(parse->rsn - 2,
 572                                                    parse->rsn_len + 2,
 573                                                    &data);
 574                         if (ret < 0) {
 575                                 wpa_printf(MSG_DEBUG, "FT: Failed to parse "
 576                                            "RSN IE: %d", ret);
 577                                 return -1;
 578                         }
 579                         if (data.num_pmkid == 1 && data.pmkid)
 580                                 parse->rsn_pmkid = data.pmkid;
 581                         break;
 582                 case WLAN_EID_MOBILITY_DOMAIN:
 583                         parse->mdie = pos + 2;
 584                         parse->mdie_len = pos[1];
 585                         break;
 586                 case WLAN_EID_FAST_BSS_TRANSITION:
 587                         if (wpa_ft_parse_ftie(pos + 2, pos[1], parse) < 0)
 588                                 return -1;
 589                         break;
 590                 }
 591
 592                 pos += 2 + pos[1];
 593         }
 594
 595         return 0;
 596 }
 597
 598
 599 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
 600                                    int vlan_id,
 601                                    const char *alg, const u8 *addr, int idx,
 602                                    u8 *key, size_t key_len)
 603 {
 604         if (wpa_auth->cb.set_key == NULL)
 605                 return -1;
 606         return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
 607                                     key, key_len);
 608 }
 609
 610
 611 static void wpa_ft_install_ptk(struct wpa_state_machine *sm)
 612 {
 613         char *alg;
 614         int klen;
 615
 616         /* MLME-SETKEYS.request(PTK) */
 617         if (sm->pairwise == WPA_CIPHER_TKIP) {
 618                 alg = "TKIP";
 619                 klen = 32;
 620         } else if (sm->pairwise == WPA_CIPHER_CCMP) {
 621                 alg = "CCMP";
 622                 klen = 16;
 623         } else
 624                 return;
 625
 626         /* FIX: add STA entry to kernel/driver here? The set_key will fail
 627          * most likely without this.. At the moment, STA entry is added only
 628          * after association has been completed. Alternatively, could
 629          * re-configure PTK at that point(?).
 630          */
 631         if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
 632                              sm->PTK.tk1, klen))
 633                 return;
 634
 635         /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
 636         sm->pairwise_set = TRUE;
 637 }
 638
 639
 640 static u16 wpa_ft_process_auth_req(struct wpa_state_machine *sm,
 641                                    const u8 *ies, size_t ies_len,
 642                                    u8 **resp_ies, size_t *resp_ies_len)
 643 {
 644         struct rsn_mdie *mdie;
 645         struct rsn_ftie *ftie;
 646         u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
 647         u8 ptk_name[WPA_PMK_NAME_LEN];
 648         struct wpa_auth_config *conf;
 649         struct wpa_ft_ies parse;
 650         size_t buflen;
 651         int ret;
 652         u8 *pos, *end;
 653
 654         *resp_ies = NULL;
 655         *resp_ies_len = 0;
 656
 657         sm->pmk_r1_name_valid = 0;
 658         conf = &sm->wpa_auth->conf;
 659
 660         wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs",
 661                     ies, ies_len);
 662
 663         if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
 664                 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
 665                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 666         }
 667
 668         mdie = (struct rsn_mdie *) parse.mdie;
 669         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 670             os_memcmp(mdie->mobility_domain,
 671                       sm->wpa_auth->conf.mobility_domain,
 672                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 673                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 674                 return WLAN_STATUS_INVALID_MDIE;
 675         }
 676
 677         ftie = (struct rsn_ftie *) parse.ftie;
 678         if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
 679                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 680                 return WLAN_STATUS_INVALID_FTIE;
 681         }
 682
 683         os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
 684
 685         if (parse.r0kh_id == NULL) {
 686                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
 687                 return WLAN_STATUS_INVALID_FTIE;
 688         }
 689
 690         wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID",
 691                     parse.r0kh_id, parse.r0kh_id_len);
 692         os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
 693         sm->r0kh_id_len = parse.r0kh_id_len;
 694
 695         if (parse.rsn_pmkid == NULL) {
 696                 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
 697                 return WLAN_STATUS_INVALID_PMKID;
 698         }
 699
 700         wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
 701                     parse.rsn_pmkid, WPA_PMK_NAME_LEN);
 702         wpa_derive_pmk_r1_name(parse.rsn_pmkid,
 703                                sm->wpa_auth->conf.r1_key_holder, sm->addr,
 704                                pmk_r1_name);
 705         wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
 706                     pmk_r1_name, WPA_PMK_NAME_LEN);
 707
 708         if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1) <
 709             0) {
 710                 if (wpa_ft_pull_pmk_r1(sm->wpa_auth, sm->addr, sm->r0kh_id,
 711                                        sm->r0kh_id_len, parse.rsn_pmkid) < 0) {
 712                         wpa_printf(MSG_DEBUG, "FT: Did not have matching "
 713                                    "PMK-R1 and unknown R0KH-ID");
 714                         return WLAN_STATUS_INVALID_PMKID;
 715                 }
 716
 717                 /*
 718                  * TODO: Should return "status pending" (and the caller should
 719                  * not send out response now). The real response will be sent
 720                  * once the response from R0KH is received.
 721                  */
 722                 return WLAN_STATUS_INVALID_PMKID;
 723         }
 724
 725         wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN);
 726         sm->pmk_r1_name_valid = 1;
 727         os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
 728
 729         if (os_get_random(sm->ANonce, WPA_NONCE_LEN)) {
 730                 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
 731                            "ANonce");
 732                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 733         }
 734
 735         wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
 736                     sm->SNonce, WPA_NONCE_LEN);
 737         wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
 738                     sm->ANonce, WPA_NONCE_LEN);
 739
 740         wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
 741                           sm->wpa_auth->addr, pmk_r1_name,
 742                           (u8 *) &sm->PTK, sizeof(sm->PTK), ptk_name);
 743         wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
 744                         (u8 *) &sm->PTK, sizeof(sm->PTK));
 745         wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
 746
 747         wpa_ft_install_ptk(sm);
 748
 749         buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
 750                 2 + FT_R1KH_ID_LEN + 200;
 751         *resp_ies = os_zalloc(buflen);
 752         if (*resp_ies == NULL) {
 753                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 754         }
 755
 756         pos = *resp_ies;
 757         end = *resp_ies + buflen;
 758
 759         ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
 760         if (ret < 0) {
 761                 os_free(*resp_ies);
 762                 *resp_ies = NULL;
 763                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 764         }
 765         pos += ret;
 766
 767         ret = wpa_write_mdie(conf, pos, end - pos);
 768         if (ret < 0) {
 769                 os_free(*resp_ies);
 770                 *resp_ies = NULL;
 771                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 772         }
 773         pos += ret;
 774
 775         ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len,
 776                              sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0);
 777         if (ret < 0) {
 778                 os_free(*resp_ies);
 779                 *resp_ies = NULL;
 780                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 781         }
 782         pos += ret;
 783
 784         *resp_ies_len = pos - *resp_ies;
 785
 786         return WLAN_STATUS_SUCCESS;
 787 }
 788
 789
 790 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
 791                          u16 auth_transaction, const u8 *ies, size_t ies_len,
 792                          void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
 793                                     u16 auth_transaction, u16 status,
 794                                     const u8 *ies, size_t ies_len),
 795                          void *ctx)
 796 {
 797         u16 status;
 798         u8 *resp_ies;
 799         size_t resp_ies_len;
 800
 801         if (sm == NULL) {
 802                 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but "
 803                            "WPA SM not available");
 804                 return;
 805         }
 806
 807         wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR
 808                    " BSSID=" MACSTR " transaction=%d",
 809                    MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction);
 810         status = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
 811                                          &resp_ies_len);
 812
 813         wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
 814                    " auth_transaction=%d status=%d",
 815                    MAC2STR(sm->addr), auth_transaction + 1, status);
 816         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
 817         cb(ctx, sm->addr, bssid, auth_transaction + 1, status,
 818            resp_ies, resp_ies_len);
 819         os_free(resp_ies);
 820 }
 821
 822
 823 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
 824                             size_t ies_len)
 825 {
 826         struct wpa_ft_ies parse;
 827         struct rsn_mdie *mdie;
 828         struct rsn_ftie *ftie;
 829         u8 mic[16];
 830
 831         if (sm == NULL)
 832                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 833
 834         wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);
 835
 836         if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
 837                 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
 838                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 839         }
 840
 841         if (parse.rsn == NULL) {
 842                 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req");
 843                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 844         }
 845
 846         if (parse.rsn_pmkid == NULL) {
 847                 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
 848                 return WLAN_STATUS_INVALID_PMKID;
 849         }
 850
 851         if (os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0)
 852         {
 853                 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match "
 854                            "with the PMKR1Name derived from auth request");
 855                 return WLAN_STATUS_INVALID_PMKID;
 856         }
 857
 858         mdie = (struct rsn_mdie *) parse.mdie;
 859         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 860             os_memcmp(mdie->mobility_domain,
 861                       sm->wpa_auth->conf.mobility_domain,
 862                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 863                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 864                 return WLAN_STATUS_INVALID_MDIE;
 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 WLAN_STATUS_INVALID_FTIE;
 871         }
 872
 873         /*
 874          * Assume that MDIE, FTIE, and RSN IE are protected and that there is
 875          * no RIC, so total of 3 protected IEs.
 876          */
 877         if (ftie->mic_control[1] != 3) {
 878                 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in FTIE (%d)",
 879                            ftie->mic_control[1]);
 880                 return WLAN_STATUS_INVALID_FTIE;
 881         }
 882
 883         if (wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 5,
 884                        parse.mdie - 2, parse.mdie_len + 2,
 885                        parse.ftie - 2, parse.ftie_len + 2,
 886                        parse.rsn - 2, parse.rsn_len + 2, NULL, 0,
 887                        mic) < 0) {
 888                 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
 889                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 890         }
 891
 892         if (os_memcmp(mic, ftie->mic, 16) != 0) {
 893                 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
 894                 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
 895                 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
 896                 return WLAN_STATUS_INVALID_FTIE;
 897         }
 898
 899         return WLAN_STATUS_SUCCESS;
 900 }
 901
 902
 903 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len)
 904 {
 905         const u8 *sta_addr, *target_ap;
 906         const u8 *ies;
 907         size_t ies_len;
 908         u8 action;
 909         struct ft_rrb_frame *frame;
 910
 911         if (sm == NULL)
 912                 return -1;
 913
 914         /*
 915          * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
 916          * FT Request action frame body[variable]
 917          */
 918
 919         if (len < 14) {
 920                 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame "
 921                            "(len=%lu)", (unsigned long) len);
 922                 return -1;
 923         }
 924
 925         action = data[1];
 926         sta_addr = data + 2;
 927         target_ap = data + 8;
 928         ies = data + 14;
 929         ies_len = len - 14;
 930
 931         wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR
 932                    " Target AP=" MACSTR " Action=%d)",
 933                    MAC2STR(sta_addr), MAC2STR(target_ap), action);
 934
 935         if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) {
 936                 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: "
 937                            "STA=" MACSTR " STA-Address=" MACSTR,
 938                            MAC2STR(sm->addr), MAC2STR(sta_addr));
 939                 return -1;
 940         }
 941
 942         /*
 943          * Do some sanity checking on the target AP address (not own and not
 944          * broadcast. This could be extended to filter based on a list of known
 945          * APs in the MD (if such a list were configured).
 946          */
 947         if ((target_ap[0] & 0x01) ||
 948             os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) {
 949                 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action "
 950                            "frame");
 951                 return -1;
 952         }
 953
 954         wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len);
 955
 956         /* RRB - Forward action frame to the target AP */
 957         frame = os_malloc(sizeof(*frame) + len);
 958         frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
 959         frame->packet_type = FT_PACKET_REQUEST;
 960         frame->action_length = host_to_le16(len);
 961         os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
 962         os_memcpy(frame + 1, data, len);
 963
 964         wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
 965                         sizeof(*frame) + len);
 966         os_free(frame);
 967
 968         return 0;
 969 }
 970
 971
 972 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
 973                                  const u8 *current_ap, const u8 *sta_addr,
 974                                  const u8 *body, size_t len)
 975 {
 976         struct wpa_state_machine *sm;
 977         u16 status;
 978         u8 *resp_ies, *pos;
 979         size_t resp_ies_len, rlen;
 980         struct ft_rrb_frame *frame;
 981
 982         sm = wpa_ft_add_sta(wpa_auth, sta_addr);
 983         if (sm == NULL) {
 984                 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
 985                            "RRB Request");
 986                 return -1;
 987         }
 988
 989         wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
 990
 991         status = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
 992                                          &resp_ies_len);
 993
 994         wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
 995                    " CurrentAP=" MACSTR " status=%d",
 996                    MAC2STR(sm->addr), MAC2STR(current_ap), status);
 997         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
 998
 999         /* RRB - Forward action frame response to the Current AP */
1000
1001         /*
1002          * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1003          * Status_Code[2] FT Request action frame body[variable]
1004          */
1005         rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;
1006
1007         frame = os_malloc(sizeof(*frame) + rlen);
1008         frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1009         frame->packet_type = FT_PACKET_RESPONSE;
1010         frame->action_length = host_to_le16(rlen);
1011         os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
1012         pos = (u8 *) (frame + 1);
1013         *pos++ = WLAN_ACTION_FT;
1014         *pos++ = 2; /* Action: Response */
1015         os_memcpy(pos, sta_addr, ETH_ALEN);
1016         pos += ETH_ALEN;
1017         os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
1018         pos += ETH_ALEN;
1019         WPA_PUT_LE16(pos, status);
1020         pos += 2;
1021         if (resp_ies) {
1022                 os_memcpy(pos, resp_ies, resp_ies_len);
1023                 os_free(resp_ies);
1024         }
1025
1026         wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
1027                         sizeof(*frame) + rlen);
1028         os_free(frame);
1029
1030         return 0;
1031 }
1032
1033
1034 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
1035                               const u8 *src_addr,
1036                               const u8 *data, size_t data_len)
1037 {
1038         struct ft_r0kh_r1kh_pull_frame *frame, f;
1039         struct ft_remote_r1kh *r1kh;
1040         struct ft_r0kh_r1kh_resp_frame resp, r;
1041         u8 pmk_r0[PMK_LEN];
1042
1043         wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
1044
1045         if (data_len < sizeof(*frame))
1046                 return -1;
1047
1048         r1kh = wpa_auth->conf.r1kh_list;
1049         while (r1kh) {
1050                 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0)
1051                         break;
1052                 r1kh = r1kh->next;
1053         }
1054         if (r1kh == NULL) {
1055                 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for "
1056                            "PMK-R1 pull source address " MACSTR,
1057                            MAC2STR(src_addr));
1058                 return -1;
1059         }
1060
1061         frame = (struct ft_r0kh_r1kh_pull_frame *) data;
1062         /* aes_unwrap() does not support inplace decryption, so use a temporary
1063          * buffer for the data. */
1064         if (aes_unwrap(r1kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
1065                        frame->nonce, f.nonce) < 0) {
1066                 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1067                            "request from " MACSTR, MAC2STR(src_addr));
1068                 return -1;
1069         }
1070
1071         wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1072                     f.nonce, sizeof(f.nonce));
1073         wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name",
1074                     f.pmk_r0_name, WPA_PMK_NAME_LEN);
1075         wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID="
1076                    MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
1077
1078         os_memset(&resp, 0, sizeof(resp));
1079         resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1080         resp.packet_type = FT_PACKET_R0KH_R1KH_RESP;
1081         resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN);
1082         os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN);
1083
1084         /* aes_wrap() does not support inplace encryption, so use a temporary
1085          * buffer for the data. */
1086         os_memcpy(r.nonce, f.nonce, sizeof(f.nonce));
1087         os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN);
1088         os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN);
1089         if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0) <
1090             0) {
1091                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for "
1092                            "PMK-R1 pull");
1093                 return -1;
1094         }
1095
1096         wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id,
1097                           r.pmk_r1, r.pmk_r1_name);
1098         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN);
1099         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name,
1100                     WPA_PMK_NAME_LEN);
1101
1102         if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1103                      r.nonce, resp.nonce) < 0) {
1104                 os_memset(pmk_r0, 0, PMK_LEN);
1105                 return -1;
1106         }
1107
1108         os_memset(pmk_r0, 0, PMK_LEN);
1109
1110         wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp));
1111
1112         return 0;
1113 }
1114
1115
1116 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
1117                               const u8 *src_addr,
1118                               const u8 *data, size_t data_len)
1119 {
1120         struct ft_r0kh_r1kh_resp_frame *frame, f;
1121         struct ft_remote_r0kh *r0kh;
1122
1123         wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
1124
1125         if (data_len < sizeof(*frame))
1126                 return -1;
1127
1128         r0kh = wpa_auth->conf.r0kh_list;
1129         while (r0kh) {
1130                 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1131                         break;
1132                 r0kh = r0kh->next;
1133         }
1134         if (r0kh == NULL) {
1135                 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1136                            "PMK-R0 pull response source address " MACSTR,
1137                            MAC2STR(src_addr));
1138                 return -1;
1139         }
1140
1141         frame = (struct ft_r0kh_r1kh_resp_frame *) data;
1142         /* aes_unwrap() does not support inplace decryption, so use a temporary
1143          * buffer for the data. */
1144         if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1145                        frame->nonce, f.nonce) < 0) {
1146                 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1147                            "response from " MACSTR, MAC2STR(src_addr));
1148                 return -1;
1149         }
1150
1151         if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN)
1152             != 0) {
1153                 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a "
1154                            "matching R1KH-ID");
1155                 return -1;
1156         }
1157
1158         /* TODO: verify that <nonce,s1kh_id> matches with a pending request
1159          * and call this requests callback function to finish request
1160          * processing */
1161
1162         wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1163                     f.nonce, sizeof(f.nonce));
1164         wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID="
1165                    MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
1166         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1",
1167                         f.pmk_r1, PMK_LEN);
1168         wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name",
1169                         f.pmk_r1_name, WPA_PMK_NAME_LEN);
1170
1171         wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name);
1172         os_memset(f.pmk_r1, 0, PMK_LEN);
1173
1174         return 0;
1175 }
1176
1177
1178 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
1179                               const u8 *src_addr,
1180                               const u8 *data, size_t data_len)
1181 {
1182         struct ft_r0kh_r1kh_push_frame *frame, f;
1183         struct ft_remote_r0kh *r0kh;
1184         struct os_time now;
1185         os_time_t tsend;
1186
1187         wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
1188
1189         if (data_len < sizeof(*frame))
1190                 return -1;
1191
1192         r0kh = wpa_auth->conf.r0kh_list;
1193         while (r0kh) {
1194                 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1195                         break;
1196                 r0kh = r0kh->next;
1197         }
1198         if (r0kh == NULL) {
1199                 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1200                            "PMK-R0 push source address " MACSTR,
1201                            MAC2STR(src_addr));
1202                 return -1;
1203         }
1204
1205         frame = (struct ft_r0kh_r1kh_push_frame *) data;
1206         /* aes_unwrap() does not support inplace decryption, so use a temporary
1207          * buffer for the data. */
1208         if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1209                        frame->timestamp, f.timestamp) < 0) {
1210                 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from "
1211                            MACSTR, MAC2STR(src_addr));
1212                 return -1;
1213         }
1214
1215         os_get_time(&now);
1216         tsend = WPA_GET_LE32(f.timestamp);
1217         if ((now.sec > tsend && now.sec - tsend > 60) ||
1218             (now.sec < tsend && tsend - now.sec > 60)) {
1219                 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid "
1220                            "timestamp: sender time %d own time %d\n",
1221                            (int) tsend, (int) now.sec);
1222                 return -1;
1223         }
1224
1225         if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN)
1226             != 0) {
1227                 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching "
1228                            "R1KH-ID (received " MACSTR " own " MACSTR ")",
1229                            MAC2STR(f.r1kh_id),
1230                            MAC2STR(wpa_auth->conf.r1_key_holder));
1231                 return -1;
1232         }
1233
1234         wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID="
1235                    MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
1236         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1",
1237                         f.pmk_r1, PMK_LEN);
1238         wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name",
1239                         f.pmk_r1_name, WPA_PMK_NAME_LEN);
1240
1241         wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name);
1242         os_memset(f.pmk_r1, 0, PMK_LEN);
1243
1244         return 0;
1245 }
1246
1247
1248 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
1249                   const u8 *data, size_t data_len)
1250 {
1251         struct ft_rrb_frame *frame;
1252         u16 alen;
1253         const u8 *pos, *end, *start;
1254         u8 action;
1255         const u8 *sta_addr, *target_ap_addr;
1256
1257         wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
1258                    MAC2STR(src_addr));
1259
1260         if (data_len < sizeof(*frame)) {
1261                 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
1262                            (unsigned long) data_len);
1263                 return -1;
1264         }
1265
1266         pos = data;
1267         frame = (struct ft_rrb_frame *) pos;
1268         pos += sizeof(*frame);
1269
1270         alen = le_to_host16(frame->action_length);
1271         wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
1272                    "action_length=%d ap_address=" MACSTR,
1273                    frame->frame_type, frame->packet_type, alen,
1274                    MAC2STR(frame->ap_address));
1275
1276         if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
1277                 /* Discard frame per IEEE 802.11r/D8.0, 10A.10.3 */
1278                 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
1279                            "unrecognized type %d", frame->frame_type);
1280                 return -1;
1281         }
1282
1283         if (alen > data_len - sizeof(*frame)) {
1284                 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
1285                            "frame");
1286                 return -1;
1287         }
1288
1289         if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL)
1290                 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len);
1291         if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP)
1292                 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len);
1293         if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH)
1294                 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len);
1295
1296         wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);
1297
1298         if (alen < 1 + 1 + 2 * ETH_ALEN) {
1299                 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
1300                            "room for Action Frame body); alen=%lu",
1301                            (unsigned long) alen);
1302                 return -1;
1303         }
1304         start = pos;
1305         end = pos + alen;
1306
1307         if (*pos != WLAN_ACTION_FT) {
1308                 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
1309                            "%d", *pos);
1310                 return -1;
1311         }
1312
1313         pos++;
1314         action = *pos++;
1315         sta_addr = pos;
1316         pos += ETH_ALEN;
1317         target_ap_addr = pos;
1318         pos += ETH_ALEN;
1319         wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
1320                    MACSTR " target_ap_addr=" MACSTR,
1321                    action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));
1322
1323         if (frame->packet_type == FT_PACKET_REQUEST) {
1324                 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");
1325
1326                 if (action != 1) {
1327                         wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
1328                                    "RRB Request", action);
1329                         return -1;
1330                 }
1331
1332                 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
1333                         wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
1334                                    "RRB Request does not match with own "
1335                                    "address");
1336                         return -1;
1337                 }
1338
1339                 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
1340                                           sta_addr, pos, end - pos) < 0)
1341                         return -1;
1342         } else if (frame->packet_type == FT_PACKET_RESPONSE) {
1343                 u16 status_code;
1344
1345                 if (end - pos < 2) {
1346                         wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
1347                                    "code in RRB Response");
1348                         return -1;
1349                 }
1350                 status_code = WPA_GET_LE16(pos);
1351                 pos += 2;
1352
1353                 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
1354                            "(status_code=%d)", status_code);
1355
1356                 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
1357                         return -1;
1358         } else {
1359                 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
1360                            "packet_type %d", frame->packet_type);
1361                 return -1;
1362         }
1363
1364         return 0;
1365 }
1366
1367
1368 static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
1369                                    struct wpa_ft_pmk_r0_sa *pmk_r0,
1370                                    struct ft_remote_r1kh *r1kh,
1371                                    const u8 *s1kh_id)
1372 {
1373         struct ft_r0kh_r1kh_push_frame frame, f;
1374         struct os_time now;
1375
1376         os_memset(&frame, 0, sizeof(frame));
1377         frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1378         frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH;
1379         frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN);
1380         os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);
1381
1382         /* aes_wrap() does not support inplace encryption, so use a temporary
1383          * buffer for the data. */
1384         os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN);
1385         os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
1386         os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN);
1387         wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id,
1388                           s1kh_id, f.pmk_r1, f.pmk_r1_name);
1389         wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id));
1390         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN);
1391         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name,
1392                     WPA_PMK_NAME_LEN);
1393         os_get_time(&now);
1394         WPA_PUT_LE32(f.timestamp, now.sec);
1395         if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1396                      f.timestamp, frame.timestamp) < 0)
1397                 return;
1398
1399         wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame));
1400 }
1401
1402
1403 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
1404 {
1405         struct wpa_ft_pmk_r0_sa *r0;
1406         struct ft_remote_r1kh *r1kh;
1407
1408         if (!wpa_auth->conf.pmk_r1_push)
1409                 return;
1410
1411         r0 = wpa_auth->ft_pmk_cache->pmk_r0;
1412         while (r0) {
1413                 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0)
1414                         break;
1415                 r0 = r0->next;
1416         }
1417
1418         if (r0 == NULL || r0->pmk_r1_pushed)
1419                 return;
1420         r0->pmk_r1_pushed = 1;
1421
1422         wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
1423                    "for STA " MACSTR, MAC2STR(addr));
1424
1425         r1kh = wpa_auth->conf.r1kh_list;
1426         while (r1kh) {
1427                 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr);
1428                 r1kh = r1kh->next;
1429         }
1430 }
1431
1432 #endif /* CONFIG_IEEE80211R */