libeap/src/ap/wpa_auth_ft.c

   1 /*
   2  * hostapd - IEEE 802.11r - Fast BSS Transition
   3  * Copyright (c) 2004-2015, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "utils/includes.h"
  10
  11 #include "utils/common.h"
  12 #include "utils/eloop.h"
  13 #include "utils/list.h"
  14 #include "common/ieee802_11_defs.h"
  15 #include "common/ieee802_11_common.h"
  16 #include "crypto/aes_wrap.h"
  17 #include "crypto/random.h"
  18 #include "ap_config.h"
  19 #include "ieee802_11.h"
  20 #include "wmm.h"
  21 #include "wpa_auth.h"
  22 #include "wpa_auth_i.h"
  23
  24
  25 #ifdef CONFIG_IEEE80211R
  26
  27 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
  28                                      const u8 *current_ap, const u8 *sta_addr,
  29                                      u16 status, const u8 *resp_ies,
  30                                      size_t resp_ies_len);
  31
  32
  33 static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst,
  34                            const u8 *data, size_t data_len)
  35 {
  36         if (wpa_auth->cb.send_ether == NULL)
  37                 return -1;
  38         wpa_printf(MSG_DEBUG, "FT: RRB send to " MACSTR, MAC2STR(dst));
  39         return wpa_auth->cb.send_ether(wpa_auth->cb.ctx, dst, ETH_P_RRB,
  40                                        data, data_len);
  41 }
  42
  43
  44 static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth,
  45                               const u8 *dst, const u8 *data, size_t data_len)
  46 {
  47         if (wpa_auth->cb.send_ft_action == NULL)
  48                 return -1;
  49         return wpa_auth->cb.send_ft_action(wpa_auth->cb.ctx, dst,
  50                                            data, data_len);
  51 }
  52
  53
  54 static struct wpa_state_machine *
  55 wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr)
  56 {
  57         if (wpa_auth->cb.add_sta == NULL)
  58                 return NULL;
  59         return wpa_auth->cb.add_sta(wpa_auth->cb.ctx, sta_addr);
  60 }
  61
  62
  63 static int wpa_ft_add_tspec(struct wpa_authenticator *wpa_auth,
  64                             const u8 *sta_addr,
  65                             u8 *tspec_ie, size_t tspec_ielen)
  66 {
  67         if (wpa_auth->cb.add_tspec == NULL) {
  68                 wpa_printf(MSG_DEBUG, "FT: add_tspec is not initialized");
  69                 return -1;
  70         }
  71         return wpa_auth->cb.add_tspec(wpa_auth->cb.ctx, sta_addr, tspec_ie,
  72                                       tspec_ielen);
  73 }
  74
  75
  76 int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len)
  77 {
  78         u8 *pos = buf;
  79         u8 capab;
  80         if (len < 2 + sizeof(struct rsn_mdie))
  81                 return -1;
  82
  83         *pos++ = WLAN_EID_MOBILITY_DOMAIN;
  84         *pos++ = MOBILITY_DOMAIN_ID_LEN + 1;
  85         os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN);
  86         pos += MOBILITY_DOMAIN_ID_LEN;
  87         capab = 0;
  88         if (conf->ft_over_ds)
  89                 capab |= RSN_FT_CAPAB_FT_OVER_DS;
  90         *pos++ = capab;
  91
  92         return pos - buf;
  93 }
  94
  95
  96 int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id,
  97                    size_t r0kh_id_len,
  98                    const u8 *anonce, const u8 *snonce,
  99                    u8 *buf, size_t len, const u8 *subelem,
 100                    size_t subelem_len)
 101 {
 102         u8 *pos = buf, *ielen;
 103         struct rsn_ftie *hdr;
 104
 105         if (len < 2 + sizeof(*hdr) + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len +
 106             subelem_len)
 107                 return -1;
 108
 109         *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
 110         ielen = pos++;
 111
 112         hdr = (struct rsn_ftie *) pos;
 113         os_memset(hdr, 0, sizeof(*hdr));
 114         pos += sizeof(*hdr);
 115         WPA_PUT_LE16(hdr->mic_control, 0);
 116         if (anonce)
 117                 os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
 118         if (snonce)
 119                 os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
 120
 121         /* Optional Parameters */
 122         *pos++ = FTIE_SUBELEM_R1KH_ID;
 123         *pos++ = FT_R1KH_ID_LEN;
 124         os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN);
 125         pos += FT_R1KH_ID_LEN;
 126
 127         if (r0kh_id) {
 128                 *pos++ = FTIE_SUBELEM_R0KH_ID;
 129                 *pos++ = r0kh_id_len;
 130                 os_memcpy(pos, r0kh_id, r0kh_id_len);
 131                 pos += r0kh_id_len;
 132         }
 133
 134         if (subelem) {
 135                 os_memcpy(pos, subelem, subelem_len);
 136                 pos += subelem_len;
 137         }
 138
 139         *ielen = pos - buf - 2;
 140
 141         return pos - buf;
 142 }
 143
 144
 145 struct wpa_ft_pmk_r0_sa {
 146         struct wpa_ft_pmk_r0_sa *next;
 147         u8 pmk_r0[PMK_LEN];
 148         u8 pmk_r0_name[WPA_PMK_NAME_LEN];
 149         u8 spa[ETH_ALEN];
 150         int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
 151         /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
 152         int pmk_r1_pushed;
 153 };
 154
 155 struct wpa_ft_pmk_r1_sa {
 156         struct wpa_ft_pmk_r1_sa *next;
 157         u8 pmk_r1[PMK_LEN];
 158         u8 pmk_r1_name[WPA_PMK_NAME_LEN];
 159         u8 spa[ETH_ALEN];
 160         int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
 161         /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
 162 };
 163
 164 struct wpa_ft_pmk_cache {
 165         struct wpa_ft_pmk_r0_sa *pmk_r0;
 166         struct wpa_ft_pmk_r1_sa *pmk_r1;
 167 };
 168
 169 struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void)
 170 {
 171         struct wpa_ft_pmk_cache *cache;
 172
 173         cache = os_zalloc(sizeof(*cache));
 174
 175         return cache;
 176 }
 177
 178
 179 void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache)
 180 {
 181         struct wpa_ft_pmk_r0_sa *r0, *r0prev;
 182         struct wpa_ft_pmk_r1_sa *r1, *r1prev;
 183
 184         r0 = cache->pmk_r0;
 185         while (r0) {
 186                 r0prev = r0;
 187                 r0 = r0->next;
 188                 os_memset(r0prev->pmk_r0, 0, PMK_LEN);
 189                 os_free(r0prev);
 190         }
 191
 192         r1 = cache->pmk_r1;
 193         while (r1) {
 194                 r1prev = r1;
 195                 r1 = r1->next;
 196                 os_memset(r1prev->pmk_r1, 0, PMK_LEN);
 197                 os_free(r1prev);
 198         }
 199
 200         os_free(cache);
 201 }
 202
 203
 204 static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
 205                                const u8 *spa, const u8 *pmk_r0,
 206                                const u8 *pmk_r0_name, int pairwise)
 207 {
 208         struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
 209         struct wpa_ft_pmk_r0_sa *r0;
 210
 211         /* TODO: add expiration and limit on number of entries in cache */
 212
 213         r0 = os_zalloc(sizeof(*r0));
 214         if (r0 == NULL)
 215                 return -1;
 216
 217         os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN);
 218         os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
 219         os_memcpy(r0->spa, spa, ETH_ALEN);
 220         r0->pairwise = pairwise;
 221
 222         r0->next = cache->pmk_r0;
 223         cache->pmk_r0 = r0;
 224
 225         return 0;
 226 }
 227
 228
 229 static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth,
 230                                const u8 *spa, const u8 *pmk_r0_name,
 231                                u8 *pmk_r0, int *pairwise)
 232 {
 233         struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
 234         struct wpa_ft_pmk_r0_sa *r0;
 235
 236         r0 = cache->pmk_r0;
 237         while (r0) {
 238                 if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 &&
 239                     os_memcmp_const(r0->pmk_r0_name, pmk_r0_name,
 240                                     WPA_PMK_NAME_LEN) == 0) {
 241                         os_memcpy(pmk_r0, r0->pmk_r0, PMK_LEN);
 242                         if (pairwise)
 243                                 *pairwise = r0->pairwise;
 244                         return 0;
 245                 }
 246
 247                 r0 = r0->next;
 248         }
 249
 250         return -1;
 251 }
 252
 253
 254 static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
 255                                const u8 *spa, const u8 *pmk_r1,
 256                                const u8 *pmk_r1_name, int pairwise)
 257 {
 258         struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
 259         struct wpa_ft_pmk_r1_sa *r1;
 260
 261         /* TODO: add expiration and limit on number of entries in cache */
 262
 263         r1 = os_zalloc(sizeof(*r1));
 264         if (r1 == NULL)
 265                 return -1;
 266
 267         os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN);
 268         os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
 269         os_memcpy(r1->spa, spa, ETH_ALEN);
 270         r1->pairwise = pairwise;
 271
 272         r1->next = cache->pmk_r1;
 273         cache->pmk_r1 = r1;
 274
 275         return 0;
 276 }
 277
 278
 279 static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
 280                                const u8 *spa, const u8 *pmk_r1_name,
 281                                u8 *pmk_r1, int *pairwise)
 282 {
 283         struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
 284         struct wpa_ft_pmk_r1_sa *r1;
 285
 286         r1 = cache->pmk_r1;
 287         while (r1) {
 288                 if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 &&
 289                     os_memcmp_const(r1->pmk_r1_name, pmk_r1_name,
 290                                     WPA_PMK_NAME_LEN) == 0) {
 291                         os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN);
 292                         if (pairwise)
 293                                 *pairwise = r1->pairwise;
 294                         return 0;
 295                 }
 296
 297                 r1 = r1->next;
 298         }
 299
 300         return -1;
 301 }
 302
 303
 304 static int wpa_ft_pull_pmk_r1(struct wpa_state_machine *sm,
 305                               const u8 *ies, size_t ies_len,
 306                               const u8 *pmk_r0_name)
 307 {
 308         struct ft_remote_r0kh *r0kh;
 309         struct ft_r0kh_r1kh_pull_frame frame, f;
 310
 311         r0kh = sm->wpa_auth->conf.r0kh_list;
 312         while (r0kh) {
 313                 if (r0kh->id_len == sm->r0kh_id_len &&
 314                     os_memcmp_const(r0kh->id, sm->r0kh_id, sm->r0kh_id_len) ==
 315                     0)
 316                         break;
 317                 r0kh = r0kh->next;
 318         }
 319         if (r0kh == NULL) {
 320                 wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID",
 321                             sm->r0kh_id, sm->r0kh_id_len);
 322                 return -1;
 323         }
 324
 325         wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH "
 326                    "address " MACSTR, MAC2STR(r0kh->addr));
 327
 328         os_memset(&frame, 0, sizeof(frame));
 329         frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
 330         frame.packet_type = FT_PACKET_R0KH_R1KH_PULL;
 331         frame.data_length = host_to_le16(FT_R0KH_R1KH_PULL_DATA_LEN);
 332         os_memcpy(frame.ap_address, sm->wpa_auth->addr, ETH_ALEN);
 333
 334         /* aes_wrap() does not support inplace encryption, so use a temporary
 335          * buffer for the data. */
 336         if (random_get_bytes(f.nonce, FT_R0KH_R1KH_PULL_NONCE_LEN)) {
 337                 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
 338                            "nonce");
 339                 return -1;
 340         }
 341         os_memcpy(sm->ft_pending_pull_nonce, f.nonce,
 342                   FT_R0KH_R1KH_PULL_NONCE_LEN);
 343         os_memcpy(f.pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
 344         os_memcpy(f.r1kh_id, sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
 345         os_memcpy(f.s1kh_id, sm->addr, ETH_ALEN);
 346         os_memset(f.pad, 0, sizeof(f.pad));
 347
 348         if (aes_wrap(r0kh->key, sizeof(r0kh->key),
 349                      (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
 350                      f.nonce, frame.nonce) < 0)
 351                 return -1;
 352
 353         wpabuf_free(sm->ft_pending_req_ies);
 354         sm->ft_pending_req_ies = wpabuf_alloc_copy(ies, ies_len);
 355         if (sm->ft_pending_req_ies == NULL)
 356                 return -1;
 357
 358         wpa_ft_rrb_send(sm->wpa_auth, r0kh->addr, (u8 *) &frame, sizeof(frame));
 359
 360         return 0;
 361 }
 362
 363
 364 int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
 365                            struct wpa_ptk *ptk)
 366 {
 367         u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
 368         u8 pmk_r1[PMK_LEN];
 369         u8 ptk_name[WPA_PMK_NAME_LEN];
 370         const u8 *mdid = sm->wpa_auth->conf.mobility_domain;
 371         const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder;
 372         size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len;
 373         const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder;
 374         const u8 *ssid = sm->wpa_auth->conf.ssid;
 375         size_t ssid_len = sm->wpa_auth->conf.ssid_len;
 376
 377         if (sm->xxkey_len == 0) {
 378                 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
 379                            "derivation");
 380                 return -1;
 381         }
 382
 383         wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid,
 384                           r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name);
 385         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN);
 386         wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN);
 387         wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name,
 388                             sm->pairwise);
 389
 390         wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
 391                           pmk_r1, sm->pmk_r1_name);
 392         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN);
 393         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
 394                     WPA_PMK_NAME_LEN);
 395         wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, sm->pmk_r1_name,
 396                             sm->pairwise);
 397
 398         return wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
 399                                  sm->wpa_auth->addr, sm->pmk_r1_name,
 400                                  ptk, ptk_name, sm->wpa_key_mgmt, sm->pairwise);
 401 }
 402
 403
 404 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
 405                                       const u8 *addr, int idx, u8 *seq)
 406 {
 407         if (wpa_auth->cb.get_seqnum == NULL)
 408                 return -1;
 409         return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
 410 }
 411
 412
 413 static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len)
 414 {
 415         u8 *subelem;
 416         struct wpa_group *gsm = sm->group;
 417         size_t subelem_len, pad_len;
 418         const u8 *key;
 419         size_t key_len;
 420         u8 keybuf[32];
 421
 422         key_len = gsm->GTK_len;
 423         if (key_len > sizeof(keybuf))
 424                 return NULL;
 425
 426         /*
 427          * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less
 428          * than 16 bytes.
 429          */
 430         pad_len = key_len % 8;
 431         if (pad_len)
 432                 pad_len = 8 - pad_len;
 433         if (key_len + pad_len < 16)
 434                 pad_len += 8;
 435         if (pad_len && key_len < sizeof(keybuf)) {
 436                 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
 437                 os_memset(keybuf + key_len, 0, pad_len);
 438                 keybuf[key_len] = 0xdd;
 439                 key_len += pad_len;
 440                 key = keybuf;
 441         } else
 442                 key = gsm->GTK[gsm->GN - 1];
 443
 444         /*
 445          * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
 446          * Key[5..32].
 447          */
 448         subelem_len = 13 + key_len + 8;
 449         subelem = os_zalloc(subelem_len);
 450         if (subelem == NULL)
 451                 return NULL;
 452
 453         subelem[0] = FTIE_SUBELEM_GTK;
 454         subelem[1] = 11 + key_len + 8;
 455         /* Key ID in B0-B1 of Key Info */
 456         WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03);
 457         subelem[4] = gsm->GTK_len;
 458         wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5);
 459         if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len, key_len / 8, key,
 460                      subelem + 13)) {
 461                 os_free(subelem);
 462                 return NULL;
 463         }
 464
 465         *len = subelem_len;
 466         return subelem;
 467 }
 468
 469
 470 #ifdef CONFIG_IEEE80211W
 471 static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
 472 {
 473         u8 *subelem, *pos;
 474         struct wpa_group *gsm = sm->group;
 475         size_t subelem_len;
 476
 477         /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] |
 478          * Key[16+8] */
 479         subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8;
 480         subelem = os_zalloc(subelem_len);
 481         if (subelem == NULL)
 482                 return NULL;
 483
 484         pos = subelem;
 485         *pos++ = FTIE_SUBELEM_IGTK;
 486         *pos++ = subelem_len - 2;
 487         WPA_PUT_LE16(pos, gsm->GN_igtk);
 488         pos += 2;
 489         wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos);
 490         pos += 6;
 491         *pos++ = WPA_IGTK_LEN;
 492         if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len, WPA_IGTK_LEN / 8,
 493                      gsm->IGTK[gsm->GN_igtk - 4], pos)) {
 494                 os_free(subelem);
 495                 return NULL;
 496         }
 497
 498         *len = subelem_len;
 499         return subelem;
 500 }
 501 #endif /* CONFIG_IEEE80211W */
 502
 503
 504 static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm,
 505                                 u8 *pos, u8 *end, u8 id, u8 descr_count,
 506                                 const u8 *ies, size_t ies_len)
 507 {
 508         struct ieee802_11_elems parse;
 509         struct rsn_rdie *rdie;
 510
 511         wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d",
 512                    id, descr_count);
 513         wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)",
 514                     ies, ies_len);
 515
 516         if (end - pos < (int) sizeof(*rdie)) {
 517                 wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE");
 518                 return pos;
 519         }
 520
 521         *pos++ = WLAN_EID_RIC_DATA;
 522         *pos++ = sizeof(*rdie);
 523         rdie = (struct rsn_rdie *) pos;
 524         rdie->id = id;
 525         rdie->descr_count = 0;
 526         rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS);
 527         pos += sizeof(*rdie);
 528
 529         if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) ==
 530             ParseFailed) {
 531                 wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs");
 532                 rdie->status_code =
 533                         host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
 534                 return pos;
 535         }
 536
 537         if (parse.wmm_tspec) {
 538                 struct wmm_tspec_element *tspec;
 539
 540                 if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) {
 541                         wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE "
 542                                    "(%d)", (int) parse.wmm_tspec_len);
 543                         rdie->status_code =
 544                                 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
 545                         return pos;
 546                 }
 547                 if (end - pos < (int) sizeof(*tspec)) {
 548                         wpa_printf(MSG_ERROR, "FT: Not enough room for "
 549                                    "response TSPEC");
 550                         rdie->status_code =
 551                                 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
 552                         return pos;
 553                 }
 554                 tspec = (struct wmm_tspec_element *) pos;
 555                 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
 556         }
 557
 558 #ifdef NEED_AP_MLME
 559         if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) {
 560                 int res;
 561
 562                 res = wmm_process_tspec((struct wmm_tspec_element *) pos);
 563                 wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res);
 564                 if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS)
 565                         rdie->status_code =
 566                                 host_to_le16(WLAN_STATUS_INVALID_PARAMETERS);
 567                 else if (res == WMM_ADDTS_STATUS_REFUSED)
 568                         rdie->status_code =
 569                                 host_to_le16(WLAN_STATUS_REQUEST_DECLINED);
 570                 else {
 571                         /* TSPEC accepted; include updated TSPEC in response */
 572                         rdie->descr_count = 1;
 573                         pos += sizeof(struct wmm_tspec_element);
 574                 }
 575                 return pos;
 576         }
 577 #endif /* NEED_AP_MLME */
 578
 579         if (parse.wmm_tspec && !sm->wpa_auth->conf.ap_mlme) {
 580                 int res;
 581
 582                 res = wpa_ft_add_tspec(sm->wpa_auth, sm->addr, pos,
 583                                        sizeof(struct wmm_tspec_element));
 584                 if (res >= 0) {
 585                         if (res)
 586                                 rdie->status_code = host_to_le16(res);
 587                         else {
 588                                 /* TSPEC accepted; include updated TSPEC in
 589                                  * response */
 590                                 rdie->descr_count = 1;
 591                                 pos += sizeof(struct wmm_tspec_element);
 592                         }
 593                         return pos;
 594                 }
 595         }
 596
 597         wpa_printf(MSG_DEBUG, "FT: No supported resource requested");
 598         rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
 599         return pos;
 600 }
 601
 602
 603 static u8 * wpa_ft_process_ric(struct wpa_state_machine *sm, u8 *pos, u8 *end,
 604                                const u8 *ric, size_t ric_len)
 605 {
 606         const u8 *rpos, *start;
 607         const struct rsn_rdie *rdie;
 608
 609         wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len);
 610
 611         rpos = ric;
 612         while (rpos + sizeof(*rdie) < ric + ric_len) {
 613                 if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) ||
 614                     rpos + 2 + rpos[1] > ric + ric_len)
 615                         break;
 616                 rdie = (const struct rsn_rdie *) (rpos + 2);
 617                 rpos += 2 + rpos[1];
 618                 start = rpos;
 619
 620                 while (rpos + 2 <= ric + ric_len &&
 621                        rpos + 2 + rpos[1] <= ric + ric_len) {
 622                         if (rpos[0] == WLAN_EID_RIC_DATA)
 623                                 break;
 624                         rpos += 2 + rpos[1];
 625                 }
 626                 pos = wpa_ft_process_rdie(sm, pos, end, rdie->id,
 627                                           rdie->descr_count,
 628                                           start, rpos - start);
 629         }
 630
 631         return pos;
 632 }
 633
 634
 635 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
 636                                  size_t max_len, int auth_alg,
 637                                  const u8 *req_ies, size_t req_ies_len)
 638 {
 639         u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL;
 640         size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0;
 641         int res;
 642         struct wpa_auth_config *conf;
 643         struct rsn_ftie *_ftie;
 644         struct wpa_ft_ies parse;
 645         u8 *ric_start;
 646         u8 *anonce, *snonce;
 647
 648         if (sm == NULL)
 649                 return pos;
 650
 651         conf = &sm->wpa_auth->conf;
 652
 653         if (!wpa_key_mgmt_ft(sm->wpa_key_mgmt))
 654                 return pos;
 655
 656         end = pos + max_len;
 657
 658         if (auth_alg == WLAN_AUTH_FT) {
 659                 /*
 660                  * RSN (only present if this is a Reassociation Response and
 661                  * part of a fast BSS transition)
 662                  */
 663                 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name);
 664                 if (res < 0)
 665                         return pos;
 666                 rsnie = pos;
 667                 rsnie_len = res;
 668                 pos += res;
 669         }
 670
 671         /* Mobility Domain Information */
 672         res = wpa_write_mdie(conf, pos, end - pos);
 673         if (res < 0)
 674                 return pos;
 675         mdie = pos;
 676         mdie_len = res;
 677         pos += res;
 678
 679         /* Fast BSS Transition Information */
 680         if (auth_alg == WLAN_AUTH_FT) {
 681                 subelem = wpa_ft_gtk_subelem(sm, &subelem_len);
 682                 r0kh_id = sm->r0kh_id;
 683                 r0kh_id_len = sm->r0kh_id_len;
 684                 anonce = sm->ANonce;
 685                 snonce = sm->SNonce;
 686 #ifdef CONFIG_IEEE80211W
 687                 if (sm->mgmt_frame_prot) {
 688                         u8 *igtk;
 689                         size_t igtk_len;
 690                         u8 *nbuf;
 691                         igtk = wpa_ft_igtk_subelem(sm, &igtk_len);
 692                         if (igtk == NULL) {
 693                                 os_free(subelem);
 694                                 return pos;
 695                         }
 696                         nbuf = os_realloc(subelem, subelem_len + igtk_len);
 697                         if (nbuf == NULL) {
 698                                 os_free(subelem);
 699                                 os_free(igtk);
 700                                 return pos;
 701                         }
 702                         subelem = nbuf;
 703                         os_memcpy(subelem + subelem_len, igtk, igtk_len);
 704                         subelem_len += igtk_len;
 705                         os_free(igtk);
 706                 }
 707 #endif /* CONFIG_IEEE80211W */
 708         } else {
 709                 r0kh_id = conf->r0_key_holder;
 710                 r0kh_id_len = conf->r0_key_holder_len;
 711                 anonce = NULL;
 712                 snonce = NULL;
 713         }
 714         res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, anonce, snonce, pos,
 715                              end - pos, subelem, subelem_len);
 716         os_free(subelem);
 717         if (res < 0)
 718                 return pos;
 719         ftie = pos;
 720         ftie_len = res;
 721         pos += res;
 722
 723         os_free(sm->assoc_resp_ftie);
 724         sm->assoc_resp_ftie = os_malloc(ftie_len);
 725         if (sm->assoc_resp_ftie)
 726                 os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len);
 727
 728         _ftie = (struct rsn_ftie *) (ftie + 2);
 729         if (auth_alg == WLAN_AUTH_FT)
 730                 _ftie->mic_control[1] = 3; /* Information element count */
 731
 732         ric_start = pos;
 733         if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse) == 0 && parse.ric) {
 734                 pos = wpa_ft_process_ric(sm, pos, end, parse.ric,
 735                                          parse.ric_len);
 736                 if (auth_alg == WLAN_AUTH_FT)
 737                         _ftie->mic_control[1] +=
 738                                 ieee802_11_ie_count(ric_start,
 739                                                     pos - ric_start);
 740         }
 741         if (ric_start == pos)
 742                 ric_start = NULL;
 743
 744         if (auth_alg == WLAN_AUTH_FT &&
 745             wpa_ft_mic(sm->PTK.kck, sm->PTK.kck_len, sm->addr,
 746                        sm->wpa_auth->addr, 6,
 747                        mdie, mdie_len, ftie, ftie_len,
 748                        rsnie, rsnie_len,
 749                        ric_start, ric_start ? pos - ric_start : 0,
 750                        _ftie->mic) < 0)
 751                 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
 752
 753         return pos;
 754 }
 755
 756
 757 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
 758                                    int vlan_id,
 759                                    enum wpa_alg alg, const u8 *addr, int idx,
 760                                    u8 *key, size_t key_len)
 761 {
 762         if (wpa_auth->cb.set_key == NULL)
 763                 return -1;
 764         return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
 765                                     key, key_len);
 766 }
 767
 768
 769 void wpa_ft_install_ptk(struct wpa_state_machine *sm)
 770 {
 771         enum wpa_alg alg;
 772         int klen;
 773
 774         /* MLME-SETKEYS.request(PTK) */
 775         alg = wpa_cipher_to_alg(sm->pairwise);
 776         klen = wpa_cipher_key_len(sm->pairwise);
 777         if (!wpa_cipher_valid_pairwise(sm->pairwise)) {
 778                 wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip "
 779                            "PTK configuration", sm->pairwise);
 780                 return;
 781         }
 782
 783         /* FIX: add STA entry to kernel/driver here? The set_key will fail
 784          * most likely without this.. At the moment, STA entry is added only
 785          * after association has been completed. This function will be called
 786          * again after association to get the PTK configured, but that could be
 787          * optimized by adding the STA entry earlier.
 788          */
 789         if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
 790                              sm->PTK.tk, klen))
 791                 return;
 792
 793         /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
 794         sm->pairwise_set = TRUE;
 795 }
 796
 797
 798 static int wpa_ft_process_auth_req(struct wpa_state_machine *sm,
 799                                    const u8 *ies, size_t ies_len,
 800                                    u8 **resp_ies, size_t *resp_ies_len)
 801 {
 802         struct rsn_mdie *mdie;
 803         struct rsn_ftie *ftie;
 804         u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
 805         u8 ptk_name[WPA_PMK_NAME_LEN];
 806         struct wpa_auth_config *conf;
 807         struct wpa_ft_ies parse;
 808         size_t buflen;
 809         int ret;
 810         u8 *pos, *end;
 811         int pairwise;
 812
 813         *resp_ies = NULL;
 814         *resp_ies_len = 0;
 815
 816         sm->pmk_r1_name_valid = 0;
 817         conf = &sm->wpa_auth->conf;
 818
 819         wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs",
 820                     ies, ies_len);
 821
 822         if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
 823                 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
 824                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 825         }
 826
 827         mdie = (struct rsn_mdie *) parse.mdie;
 828         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 829             os_memcmp(mdie->mobility_domain,
 830                       sm->wpa_auth->conf.mobility_domain,
 831                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 832                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 833                 return WLAN_STATUS_INVALID_MDIE;
 834         }
 835
 836         ftie = (struct rsn_ftie *) parse.ftie;
 837         if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
 838                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 839                 return WLAN_STATUS_INVALID_FTIE;
 840         }
 841
 842         os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
 843
 844         if (parse.r0kh_id == NULL) {
 845                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
 846                 return WLAN_STATUS_INVALID_FTIE;
 847         }
 848
 849         wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID",
 850                     parse.r0kh_id, parse.r0kh_id_len);
 851         os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
 852         sm->r0kh_id_len = parse.r0kh_id_len;
 853
 854         if (parse.rsn_pmkid == NULL) {
 855                 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
 856                 return WLAN_STATUS_INVALID_PMKID;
 857         }
 858
 859         wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
 860                     parse.rsn_pmkid, WPA_PMK_NAME_LEN);
 861         wpa_derive_pmk_r1_name(parse.rsn_pmkid,
 862                                sm->wpa_auth->conf.r1_key_holder, sm->addr,
 863                                pmk_r1_name);
 864         wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
 865                     pmk_r1_name, WPA_PMK_NAME_LEN);
 866
 867         if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1,
 868                     &pairwise) < 0) {
 869                 if (wpa_ft_pull_pmk_r1(sm, ies, ies_len, parse.rsn_pmkid) < 0) {
 870                         wpa_printf(MSG_DEBUG, "FT: Did not have matching "
 871                                    "PMK-R1 and unknown R0KH-ID");
 872                         return WLAN_STATUS_INVALID_PMKID;
 873                 }
 874
 875                 return -1; /* Status pending */
 876         }
 877
 878         wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN);
 879         sm->pmk_r1_name_valid = 1;
 880         os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
 881
 882         if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
 883                 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
 884                            "ANonce");
 885                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 886         }
 887
 888         wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
 889                     sm->SNonce, WPA_NONCE_LEN);
 890         wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
 891                     sm->ANonce, WPA_NONCE_LEN);
 892
 893         if (wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
 894                               sm->wpa_auth->addr, pmk_r1_name,
 895                               &sm->PTK, ptk_name, sm->wpa_key_mgmt,
 896                               pairwise) < 0)
 897                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 898
 899         sm->pairwise = pairwise;
 900         sm->PTK_valid = TRUE;
 901         wpa_ft_install_ptk(sm);
 902
 903         buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
 904                 2 + FT_R1KH_ID_LEN + 200;
 905         *resp_ies = os_zalloc(buflen);
 906         if (*resp_ies == NULL) {
 907                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 908         }
 909
 910         pos = *resp_ies;
 911         end = *resp_ies + buflen;
 912
 913         ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
 914         if (ret < 0) {
 915                 os_free(*resp_ies);
 916                 *resp_ies = NULL;
 917                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 918         }
 919         pos += ret;
 920
 921         ret = wpa_write_mdie(conf, pos, end - pos);
 922         if (ret < 0) {
 923                 os_free(*resp_ies);
 924                 *resp_ies = NULL;
 925                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 926         }
 927         pos += ret;
 928
 929         ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len,
 930                              sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0);
 931         if (ret < 0) {
 932                 os_free(*resp_ies);
 933                 *resp_ies = NULL;
 934                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 935         }
 936         pos += ret;
 937
 938         *resp_ies_len = pos - *resp_ies;
 939
 940         return WLAN_STATUS_SUCCESS;
 941 }
 942
 943
 944 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
 945                          u16 auth_transaction, const u8 *ies, size_t ies_len,
 946                          void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
 947                                     u16 auth_transaction, u16 status,
 948                                     const u8 *ies, size_t ies_len),
 949                          void *ctx)
 950 {
 951         u16 status;
 952         u8 *resp_ies;
 953         size_t resp_ies_len;
 954         int res;
 955
 956         if (sm == NULL) {
 957                 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but "
 958                            "WPA SM not available");
 959                 return;
 960         }
 961
 962         wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR
 963                    " BSSID=" MACSTR " transaction=%d",
 964                    MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction);
 965         sm->ft_pending_cb = cb;
 966         sm->ft_pending_cb_ctx = ctx;
 967         sm->ft_pending_auth_transaction = auth_transaction;
 968         res = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
 969                                       &resp_ies_len);
 970         if (res < 0) {
 971                 wpa_printf(MSG_DEBUG, "FT: Callback postponed until response is available");
 972                 return;
 973         }
 974         status = res;
 975
 976         wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
 977                    " auth_transaction=%d status=%d",
 978                    MAC2STR(sm->addr), auth_transaction + 1, status);
 979         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
 980         cb(ctx, sm->addr, bssid, auth_transaction + 1, status,
 981            resp_ies, resp_ies_len);
 982         os_free(resp_ies);
 983 }
 984
 985
 986 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
 987                             size_t ies_len)
 988 {
 989         struct wpa_ft_ies parse;
 990         struct rsn_mdie *mdie;
 991         struct rsn_ftie *ftie;
 992         u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
 993         size_t mic_len = 16;
 994         unsigned int count;
 995
 996         if (sm == NULL)
 997                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 998
 999         wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);
1000
1001         if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
1002                 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
1003                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1004         }
1005
1006         if (parse.rsn == NULL) {
1007                 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req");
1008                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1009         }
1010
1011         if (parse.rsn_pmkid == NULL) {
1012                 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
1013                 return WLAN_STATUS_INVALID_PMKID;
1014         }
1015
1016         if (os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)
1017             != 0) {
1018                 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match "
1019                            "with the PMKR1Name derived from auth request");
1020                 return WLAN_STATUS_INVALID_PMKID;
1021         }
1022
1023         mdie = (struct rsn_mdie *) parse.mdie;
1024         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
1025             os_memcmp(mdie->mobility_domain,
1026                       sm->wpa_auth->conf.mobility_domain,
1027                       MOBILITY_DOMAIN_ID_LEN) != 0) {
1028                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
1029                 return WLAN_STATUS_INVALID_MDIE;
1030         }
1031
1032         ftie = (struct rsn_ftie *) parse.ftie;
1033         if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
1034                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
1035                 return WLAN_STATUS_INVALID_FTIE;
1036         }
1037
1038         if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) {
1039                 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
1040                 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
1041                             ftie->snonce, WPA_NONCE_LEN);
1042                 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
1043                             sm->SNonce, WPA_NONCE_LEN);
1044                 return -1;
1045         }
1046
1047         if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) {
1048                 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
1049                 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
1050                             ftie->anonce, WPA_NONCE_LEN);
1051                 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
1052                             sm->ANonce, WPA_NONCE_LEN);
1053                 return -1;
1054         }
1055
1056
1057         if (parse.r0kh_id == NULL) {
1058                 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
1059                 return -1;
1060         }
1061
1062         if (parse.r0kh_id_len != sm->r0kh_id_len ||
1063             os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
1064         {
1065                 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
1066                            "the current R0KH-ID");
1067                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
1068                             parse.r0kh_id, parse.r0kh_id_len);
1069                 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
1070                             sm->r0kh_id, sm->r0kh_id_len);
1071                 return -1;
1072         }
1073
1074         if (parse.r1kh_id == NULL) {
1075                 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
1076                 return -1;
1077         }
1078
1079         if (os_memcmp_const(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder,
1080                             FT_R1KH_ID_LEN) != 0) {
1081                 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
1082                            "ReassocReq");
1083                 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE",
1084                             parse.r1kh_id, FT_R1KH_ID_LEN);
1085                 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID",
1086                             sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
1087                 return -1;
1088         }
1089
1090         if (parse.rsn_pmkid == NULL ||
1091             os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
1092         {
1093                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
1094                            "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
1095                 return -1;
1096         }
1097
1098         count = 3;
1099         if (parse.ric)
1100                 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
1101         if (ftie->mic_control[1] != count) {
1102                 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
1103                            "Control: received %u expected %u",
1104                            ftie->mic_control[1], count);
1105                 return -1;
1106         }
1107
1108         if (wpa_ft_mic(sm->PTK.kck, sm->PTK.kck_len, sm->addr,
1109                        sm->wpa_auth->addr, 5,
1110                        parse.mdie - 2, parse.mdie_len + 2,
1111                        parse.ftie - 2, parse.ftie_len + 2,
1112                        parse.rsn - 2, parse.rsn_len + 2,
1113                        parse.ric, parse.ric_len,
1114                        mic) < 0) {
1115                 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
1116                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1117         }
1118
1119         if (os_memcmp_const(mic, ftie->mic, mic_len) != 0) {
1120                 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
1121                 wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR,
1122                            MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr));
1123                 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC",
1124                             ftie->mic, mic_len);
1125                 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len);
1126                 wpa_hexdump(MSG_MSGDUMP, "FT: MDIE",
1127                             parse.mdie - 2, parse.mdie_len + 2);
1128                 wpa_hexdump(MSG_MSGDUMP, "FT: FTIE",
1129                             parse.ftie - 2, parse.ftie_len + 2);
1130                 wpa_hexdump(MSG_MSGDUMP, "FT: RSN",
1131                             parse.rsn - 2, parse.rsn_len + 2);
1132                 return WLAN_STATUS_INVALID_FTIE;
1133         }
1134
1135         return WLAN_STATUS_SUCCESS;
1136 }
1137
1138
1139 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len)
1140 {
1141         const u8 *sta_addr, *target_ap;
1142         const u8 *ies;
1143         size_t ies_len;
1144         u8 action;
1145         struct ft_rrb_frame *frame;
1146
1147         if (sm == NULL)
1148                 return -1;
1149
1150         /*
1151          * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1152          * FT Request action frame body[variable]
1153          */
1154
1155         if (len < 14) {
1156                 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame "
1157                            "(len=%lu)", (unsigned long) len);
1158                 return -1;
1159         }
1160
1161         action = data[1];
1162         sta_addr = data + 2;
1163         target_ap = data + 8;
1164         ies = data + 14;
1165         ies_len = len - 14;
1166
1167         wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR
1168                    " Target AP=" MACSTR " Action=%d)",
1169                    MAC2STR(sta_addr), MAC2STR(target_ap), action);
1170
1171         if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) {
1172                 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: "
1173                            "STA=" MACSTR " STA-Address=" MACSTR,
1174                            MAC2STR(sm->addr), MAC2STR(sta_addr));
1175                 return -1;
1176         }
1177
1178         /*
1179          * Do some sanity checking on the target AP address (not own and not
1180          * broadcast. This could be extended to filter based on a list of known
1181          * APs in the MD (if such a list were configured).
1182          */
1183         if ((target_ap[0] & 0x01) ||
1184             os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) {
1185                 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action "
1186                            "frame");
1187                 return -1;
1188         }
1189
1190         wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len);
1191
1192         /* RRB - Forward action frame to the target AP */
1193         frame = os_malloc(sizeof(*frame) + len);
1194         if (frame == NULL)
1195                 return -1;
1196         frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1197         frame->packet_type = FT_PACKET_REQUEST;
1198         frame->action_length = host_to_le16(len);
1199         os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
1200         os_memcpy(frame + 1, data, len);
1201
1202         wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
1203                         sizeof(*frame) + len);
1204         os_free(frame);
1205
1206         return 0;
1207 }
1208
1209
1210 static void wpa_ft_rrb_rx_request_cb(void *ctx, const u8 *dst, const u8 *bssid,
1211                                      u16 auth_transaction, u16 resp,
1212                                      const u8 *ies, size_t ies_len)
1213 {
1214         struct wpa_state_machine *sm = ctx;
1215         wpa_printf(MSG_DEBUG, "FT: Over-the-DS RX request cb for " MACSTR,
1216                    MAC2STR(sm->addr));
1217         wpa_ft_send_rrb_auth_resp(sm, sm->ft_pending_current_ap, sm->addr,
1218                                   WLAN_STATUS_SUCCESS, ies, ies_len);
1219 }
1220
1221
1222 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
1223                                  const u8 *current_ap, const u8 *sta_addr,
1224                                  const u8 *body, size_t len)
1225 {
1226         struct wpa_state_machine *sm;
1227         u16 status;
1228         u8 *resp_ies;
1229         size_t resp_ies_len;
1230         int res;
1231
1232         sm = wpa_ft_add_sta(wpa_auth, sta_addr);
1233         if (sm == NULL) {
1234                 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
1235                            "RRB Request");
1236                 return -1;
1237         }
1238
1239         wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
1240
1241         sm->ft_pending_cb = wpa_ft_rrb_rx_request_cb;
1242         sm->ft_pending_cb_ctx = sm;
1243         os_memcpy(sm->ft_pending_current_ap, current_ap, ETH_ALEN);
1244         res = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
1245                                       &resp_ies_len);
1246         if (res < 0) {
1247                 wpa_printf(MSG_DEBUG, "FT: No immediate response available - wait for pull response");
1248                 return 0;
1249         }
1250         status = res;
1251
1252         res = wpa_ft_send_rrb_auth_resp(sm, current_ap, sta_addr, status,
1253                                         resp_ies, resp_ies_len);
1254         os_free(resp_ies);
1255         return res;
1256 }
1257
1258
1259 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
1260                                      const u8 *current_ap, const u8 *sta_addr,
1261                                      u16 status, const u8 *resp_ies,
1262                                      size_t resp_ies_len)
1263 {
1264         struct wpa_authenticator *wpa_auth = sm->wpa_auth;
1265         size_t rlen;
1266         struct ft_rrb_frame *frame;
1267         u8 *pos;
1268
1269         wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
1270                    " CurrentAP=" MACSTR " status=%d",
1271                    MAC2STR(sm->addr), MAC2STR(current_ap), status);
1272         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
1273
1274         /* RRB - Forward action frame response to the Current AP */
1275
1276         /*
1277          * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1278          * Status_Code[2] FT Request action frame body[variable]
1279          */
1280         rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;
1281
1282         frame = os_malloc(sizeof(*frame) + rlen);
1283         if (frame == NULL)
1284                 return -1;
1285         frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1286         frame->packet_type = FT_PACKET_RESPONSE;
1287         frame->action_length = host_to_le16(rlen);
1288         os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
1289         pos = (u8 *) (frame + 1);
1290         *pos++ = WLAN_ACTION_FT;
1291         *pos++ = 2; /* Action: Response */
1292         os_memcpy(pos, sta_addr, ETH_ALEN);
1293         pos += ETH_ALEN;
1294         os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
1295         pos += ETH_ALEN;
1296         WPA_PUT_LE16(pos, status);
1297         pos += 2;
1298         if (resp_ies)
1299                 os_memcpy(pos, resp_ies, resp_ies_len);
1300
1301         wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
1302                         sizeof(*frame) + rlen);
1303         os_free(frame);
1304
1305         return 0;
1306 }
1307
1308
1309 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
1310                               const u8 *src_addr,
1311                               const u8 *data, size_t data_len)
1312 {
1313         struct ft_r0kh_r1kh_pull_frame f;
1314         const u8 *crypt;
1315         u8 *plain;
1316         struct ft_remote_r1kh *r1kh;
1317         struct ft_r0kh_r1kh_resp_frame resp, r;
1318         u8 pmk_r0[PMK_LEN];
1319         int pairwise;
1320
1321         wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
1322
1323         if (data_len < sizeof(f))
1324                 return -1;
1325
1326         r1kh = wpa_auth->conf.r1kh_list;
1327         while (r1kh) {
1328                 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0)
1329                         break;
1330                 r1kh = r1kh->next;
1331         }
1332         if (r1kh == NULL) {
1333                 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for "
1334                            "PMK-R1 pull source address " MACSTR,
1335                            MAC2STR(src_addr));
1336                 return -1;
1337         }
1338
1339         crypt = data + offsetof(struct ft_r0kh_r1kh_pull_frame, nonce);
1340         os_memset(&f, 0, sizeof(f));
1341         plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_pull_frame, nonce);
1342         /* aes_unwrap() does not support inplace decryption, so use a temporary
1343          * buffer for the data. */
1344         if (aes_unwrap(r1kh->key, sizeof(r1kh->key),
1345                        (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
1346                        crypt, plain) < 0) {
1347                 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1348                            "request from " MACSTR, MAC2STR(src_addr));
1349                 return -1;
1350         }
1351
1352         wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1353                     f.nonce, sizeof(f.nonce));
1354         wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name",
1355                     f.pmk_r0_name, WPA_PMK_NAME_LEN);
1356         wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID="
1357                    MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
1358
1359         os_memset(&resp, 0, sizeof(resp));
1360         resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1361         resp.packet_type = FT_PACKET_R0KH_R1KH_RESP;
1362         resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN);
1363         os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN);
1364
1365         /* aes_wrap() does not support inplace encryption, so use a temporary
1366          * buffer for the data. */
1367         os_memcpy(r.nonce, f.nonce, sizeof(f.nonce));
1368         os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN);
1369         os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN);
1370         if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0,
1371                                 &pairwise) < 0) {
1372                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for "
1373                            "PMK-R1 pull");
1374                 return -1;
1375         }
1376
1377         wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id,
1378                           r.pmk_r1, r.pmk_r1_name);
1379         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN);
1380         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name,
1381                     WPA_PMK_NAME_LEN);
1382         r.pairwise = host_to_le16(pairwise);
1383         os_memset(r.pad, 0, sizeof(r.pad));
1384
1385         if (aes_wrap(r1kh->key, sizeof(r1kh->key),
1386                      (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1387                      r.nonce, resp.nonce) < 0) {
1388                 os_memset(pmk_r0, 0, PMK_LEN);
1389                 return -1;
1390         }
1391
1392         os_memset(pmk_r0, 0, PMK_LEN);
1393
1394         wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp));
1395
1396         return 0;
1397 }
1398
1399
1400 static void ft_pull_resp_cb_finish(void *eloop_ctx, void *timeout_ctx)
1401 {
1402         struct wpa_state_machine *sm = eloop_ctx;
1403         int res;
1404         u8 *resp_ies;
1405         size_t resp_ies_len;
1406         u16 status;
1407
1408         res = wpa_ft_process_auth_req(sm, wpabuf_head(sm->ft_pending_req_ies),
1409                                       wpabuf_len(sm->ft_pending_req_ies),
1410                                       &resp_ies, &resp_ies_len);
1411         wpabuf_free(sm->ft_pending_req_ies);
1412         sm->ft_pending_req_ies = NULL;
1413         if (res < 0)
1414                 res = WLAN_STATUS_UNSPECIFIED_FAILURE;
1415         status = res;
1416         wpa_printf(MSG_DEBUG, "FT: Postponed auth callback result for " MACSTR
1417                    " - status %u", MAC2STR(sm->addr), status);
1418
1419         sm->ft_pending_cb(sm->ft_pending_cb_ctx, sm->addr, sm->wpa_auth->addr,
1420                           sm->ft_pending_auth_transaction + 1, status,
1421                           resp_ies, resp_ies_len);
1422         os_free(resp_ies);
1423 }
1424
1425
1426 static int ft_pull_resp_cb(struct wpa_state_machine *sm, void *ctx)
1427 {
1428         struct ft_r0kh_r1kh_resp_frame *frame = ctx;
1429
1430         if (os_memcmp(frame->s1kh_id, sm->addr, ETH_ALEN) != 0)
1431                 return 0;
1432         if (os_memcmp(frame->nonce, sm->ft_pending_pull_nonce,
1433                       FT_R0KH_R1KH_PULL_NONCE_LEN) != 0)
1434                 return 0;
1435         if (sm->ft_pending_cb == NULL || sm->ft_pending_req_ies == NULL)
1436                 return 0;
1437
1438         wpa_printf(MSG_DEBUG, "FT: Response to a pending pull request for "
1439                    MACSTR " - process from timeout", MAC2STR(sm->addr));
1440         eloop_register_timeout(0, 0, ft_pull_resp_cb_finish, sm, NULL);
1441         return 1;
1442 }
1443
1444
1445 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
1446                               const u8 *src_addr,
1447                               const u8 *data, size_t data_len)
1448 {
1449         struct ft_r0kh_r1kh_resp_frame f;
1450         const u8 *crypt;
1451         u8 *plain;
1452         struct ft_remote_r0kh *r0kh;
1453         int pairwise, res;
1454
1455         wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
1456
1457         if (data_len < sizeof(f))
1458                 return -1;
1459
1460         r0kh = wpa_auth->conf.r0kh_list;
1461         while (r0kh) {
1462                 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1463                         break;
1464                 r0kh = r0kh->next;
1465         }
1466         if (r0kh == NULL) {
1467                 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1468                            "PMK-R0 pull response source address " MACSTR,
1469                            MAC2STR(src_addr));
1470                 return -1;
1471         }
1472
1473         crypt = data + offsetof(struct ft_r0kh_r1kh_resp_frame, nonce);
1474         os_memset(&f, 0, sizeof(f));
1475         plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_resp_frame, nonce);
1476         /* aes_unwrap() does not support inplace decryption, so use a temporary
1477          * buffer for the data. */
1478         if (aes_unwrap(r0kh->key, sizeof(r0kh->key),
1479                        (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1480                        crypt, plain) < 0) {
1481                 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1482                            "response from " MACSTR, MAC2STR(src_addr));
1483                 return -1;
1484         }
1485
1486         if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder,
1487                             FT_R1KH_ID_LEN) != 0) {
1488                 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a "
1489                            "matching R1KH-ID");
1490                 return -1;
1491         }
1492
1493         pairwise = le_to_host16(f.pairwise);
1494         wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1495                     f.nonce, sizeof(f.nonce));
1496         wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID="
1497                    MACSTR " pairwise=0x%x",
1498                    MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1499         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1",
1500                         f.pmk_r1, PMK_LEN);
1501         wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name",
1502                         f.pmk_r1_name, WPA_PMK_NAME_LEN);
1503
1504         res = wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1505                                   pairwise);
1506         wpa_printf(MSG_DEBUG, "FT: Look for pending pull request");
1507         wpa_auth_for_each_sta(wpa_auth, ft_pull_resp_cb, &f);
1508         os_memset(f.pmk_r1, 0, PMK_LEN);
1509
1510         return res ? 0 : -1;
1511 }
1512
1513
1514 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
1515                               const u8 *src_addr,
1516                               const u8 *data, size_t data_len)
1517 {
1518         struct ft_r0kh_r1kh_push_frame f;
1519         const u8 *crypt;
1520         u8 *plain;
1521         struct ft_remote_r0kh *r0kh;
1522         struct os_time now;
1523         os_time_t tsend;
1524         int pairwise;
1525
1526         wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
1527
1528         if (data_len < sizeof(f))
1529                 return -1;
1530
1531         r0kh = wpa_auth->conf.r0kh_list;
1532         while (r0kh) {
1533                 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1534                         break;
1535                 r0kh = r0kh->next;
1536         }
1537         if (r0kh == NULL) {
1538                 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1539                            "PMK-R0 push source address " MACSTR,
1540                            MAC2STR(src_addr));
1541                 return -1;
1542         }
1543
1544         crypt = data + offsetof(struct ft_r0kh_r1kh_push_frame, timestamp);
1545         os_memset(&f, 0, sizeof(f));
1546         plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_push_frame,
1547                                        timestamp);
1548         /* aes_unwrap() does not support inplace decryption, so use a temporary
1549          * buffer for the data. */
1550         if (aes_unwrap(r0kh->key, sizeof(r0kh->key),
1551                        (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1552                        crypt, plain) < 0) {
1553                 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from "
1554                            MACSTR, MAC2STR(src_addr));
1555                 return -1;
1556         }
1557
1558         os_get_time(&now);
1559         tsend = WPA_GET_LE32(f.timestamp);
1560         if ((now.sec > tsend && now.sec - tsend > 60) ||
1561             (now.sec < tsend && tsend - now.sec > 60)) {
1562                 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid "
1563                            "timestamp: sender time %d own time %d\n",
1564                            (int) tsend, (int) now.sec);
1565                 return -1;
1566         }
1567
1568         if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder,
1569                             FT_R1KH_ID_LEN) != 0) {
1570                 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching "
1571                            "R1KH-ID (received " MACSTR " own " MACSTR ")",
1572                            MAC2STR(f.r1kh_id),
1573                            MAC2STR(wpa_auth->conf.r1_key_holder));
1574                 return -1;
1575         }
1576
1577         pairwise = le_to_host16(f.pairwise);
1578         wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID="
1579                    MACSTR " pairwise=0x%x",
1580                    MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1581         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1",
1582                         f.pmk_r1, PMK_LEN);
1583         wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name",
1584                         f.pmk_r1_name, WPA_PMK_NAME_LEN);
1585
1586         wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1587                             pairwise);
1588         os_memset(f.pmk_r1, 0, PMK_LEN);
1589
1590         return 0;
1591 }
1592
1593
1594 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
1595                   const u8 *data, size_t data_len)
1596 {
1597         struct ft_rrb_frame *frame;
1598         u16 alen;
1599         const u8 *pos, *end, *start;
1600         u8 action;
1601         const u8 *sta_addr, *target_ap_addr;
1602
1603         wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
1604                    MAC2STR(src_addr));
1605
1606         if (data_len < sizeof(*frame)) {
1607                 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
1608                            (unsigned long) data_len);
1609                 return -1;
1610         }
1611
1612         pos = data;
1613         frame = (struct ft_rrb_frame *) pos;
1614         pos += sizeof(*frame);
1615
1616         alen = le_to_host16(frame->action_length);
1617         wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
1618                    "action_length=%d ap_address=" MACSTR,
1619                    frame->frame_type, frame->packet_type, alen,
1620                    MAC2STR(frame->ap_address));
1621
1622         if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
1623                 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */
1624                 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
1625                            "unrecognized type %d", frame->frame_type);
1626                 return -1;
1627         }
1628
1629         if (alen > data_len - sizeof(*frame)) {
1630                 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
1631                            "frame");
1632                 return -1;
1633         }
1634
1635         if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL)
1636                 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len);
1637         if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP)
1638                 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len);
1639         if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH)
1640                 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len);
1641
1642         wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);
1643
1644         if (alen < 1 + 1 + 2 * ETH_ALEN) {
1645                 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
1646                            "room for Action Frame body); alen=%lu",
1647                            (unsigned long) alen);
1648                 return -1;
1649         }
1650         start = pos;
1651         end = pos + alen;
1652
1653         if (*pos != WLAN_ACTION_FT) {
1654                 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
1655                            "%d", *pos);
1656                 return -1;
1657         }
1658
1659         pos++;
1660         action = *pos++;
1661         sta_addr = pos;
1662         pos += ETH_ALEN;
1663         target_ap_addr = pos;
1664         pos += ETH_ALEN;
1665         wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
1666                    MACSTR " target_ap_addr=" MACSTR,
1667                    action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));
1668
1669         if (frame->packet_type == FT_PACKET_REQUEST) {
1670                 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");
1671
1672                 if (action != 1) {
1673                         wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
1674                                    "RRB Request", action);
1675                         return -1;
1676                 }
1677
1678                 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
1679                         wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
1680                                    "RRB Request does not match with own "
1681                                    "address");
1682                         return -1;
1683                 }
1684
1685                 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
1686                                           sta_addr, pos, end - pos) < 0)
1687                         return -1;
1688         } else if (frame->packet_type == FT_PACKET_RESPONSE) {
1689                 u16 status_code;
1690
1691                 if (end - pos < 2) {
1692                         wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
1693                                    "code in RRB Response");
1694                         return -1;
1695                 }
1696                 status_code = WPA_GET_LE16(pos);
1697                 pos += 2;
1698
1699                 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
1700                            "(status_code=%d)", status_code);
1701
1702                 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
1703                         return -1;
1704         } else {
1705                 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
1706                            "packet_type %d", frame->packet_type);
1707                 return -1;
1708         }
1709
1710         if (end > pos) {
1711                 wpa_hexdump(MSG_DEBUG, "FT: Ignore extra data in end",
1712                             pos, end - pos);
1713         }
1714
1715         return 0;
1716 }
1717
1718
1719 static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
1720                                    struct wpa_ft_pmk_r0_sa *pmk_r0,
1721                                    struct ft_remote_r1kh *r1kh,
1722                                    const u8 *s1kh_id, int pairwise)
1723 {
1724         struct ft_r0kh_r1kh_push_frame frame, f;
1725         struct os_time now;
1726         const u8 *plain;
1727         u8 *crypt;
1728
1729         os_memset(&frame, 0, sizeof(frame));
1730         frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1731         frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH;
1732         frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN);
1733         os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);
1734
1735         /* aes_wrap() does not support inplace encryption, so use a temporary
1736          * buffer for the data. */
1737         os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN);
1738         os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
1739         os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN);
1740         wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id,
1741                           s1kh_id, f.pmk_r1, f.pmk_r1_name);
1742         wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id));
1743         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN);
1744         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name,
1745                     WPA_PMK_NAME_LEN);
1746         os_get_time(&now);
1747         WPA_PUT_LE32(f.timestamp, now.sec);
1748         f.pairwise = host_to_le16(pairwise);
1749         os_memset(f.pad, 0, sizeof(f.pad));
1750         plain = ((const u8 *) &f) + offsetof(struct ft_r0kh_r1kh_push_frame,
1751                                              timestamp);
1752         crypt = ((u8 *) &frame) + offsetof(struct ft_r0kh_r1kh_push_frame,
1753                                            timestamp);
1754         if (aes_wrap(r1kh->key, sizeof(r1kh->key),
1755                      (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1756                      plain, crypt) < 0)
1757                 return;
1758
1759         wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame));
1760 }
1761
1762
1763 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
1764 {
1765         struct wpa_ft_pmk_r0_sa *r0;
1766         struct ft_remote_r1kh *r1kh;
1767
1768         if (!wpa_auth->conf.pmk_r1_push)
1769                 return;
1770
1771         r0 = wpa_auth->ft_pmk_cache->pmk_r0;
1772         while (r0) {
1773                 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0)
1774                         break;
1775                 r0 = r0->next;
1776         }
1777
1778         if (r0 == NULL || r0->pmk_r1_pushed)
1779                 return;
1780         r0->pmk_r1_pushed = 1;
1781
1782         wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
1783                    "for STA " MACSTR, MAC2STR(addr));
1784
1785         r1kh = wpa_auth->conf.r1kh_list;
1786         while (r1kh) {
1787                 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise);
1788                 r1kh = r1kh->next;
1789         }
1790 }
1791
1792 #endif /* CONFIG_IEEE80211R */