contrib/wpa/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 #ifdef NEED_AP_MLME
 538         if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) {
 539                 struct wmm_tspec_element *tspec;
 540                 int res;
 541
 542                 if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) {
 543                         wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE "
 544                                    "(%d)", (int) parse.wmm_tspec_len);
 545                         rdie->status_code =
 546                                 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
 547                         return pos;
 548                 }
 549                 if (end - pos < (int) sizeof(*tspec)) {
 550                         wpa_printf(MSG_ERROR, "FT: Not enough room for "
 551                                    "response TSPEC");
 552                         rdie->status_code =
 553                                 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
 554                         return pos;
 555                 }
 556                 tspec = (struct wmm_tspec_element *) pos;
 557                 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
 558                 res = wmm_process_tspec(tspec);
 559                 wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res);
 560                 if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS)
 561                         rdie->status_code =
 562                                 host_to_le16(WLAN_STATUS_INVALID_PARAMETERS);
 563                 else if (res == WMM_ADDTS_STATUS_REFUSED)
 564                         rdie->status_code =
 565                                 host_to_le16(WLAN_STATUS_REQUEST_DECLINED);
 566                 else {
 567                         /* TSPEC accepted; include updated TSPEC in response */
 568                         rdie->descr_count = 1;
 569                         pos += sizeof(*tspec);
 570                 }
 571                 return pos;
 572         }
 573 #endif /* NEED_AP_MLME */
 574
 575         if (parse.wmm_tspec && !sm->wpa_auth->conf.ap_mlme) {
 576                 struct wmm_tspec_element *tspec;
 577                 int res;
 578
 579                 tspec = (struct wmm_tspec_element *) pos;
 580                 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
 581                 res = wpa_ft_add_tspec(sm->wpa_auth, sm->addr, pos,
 582                                        sizeof(*tspec));
 583                 if (res >= 0) {
 584                         if (res)
 585                                 rdie->status_code = host_to_le16(res);
 586                         else {
 587                                 /* TSPEC accepted; include updated TSPEC in
 588                                  * response */
 589                                 rdie->descr_count = 1;
 590                                 pos += sizeof(*tspec);
 591                         }
 592                         return pos;
 593                 }
 594         }
 595
 596         wpa_printf(MSG_DEBUG, "FT: No supported resource requested");
 597         rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
 598         return pos;
 599 }
 600
 601
 602 static u8 * wpa_ft_process_ric(struct wpa_state_machine *sm, u8 *pos, u8 *end,
 603                                const u8 *ric, size_t ric_len)
 604 {
 605         const u8 *rpos, *start;
 606         const struct rsn_rdie *rdie;
 607
 608         wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len);
 609
 610         rpos = ric;
 611         while (rpos + sizeof(*rdie) < ric + ric_len) {
 612                 if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) ||
 613                     rpos + 2 + rpos[1] > ric + ric_len)
 614                         break;
 615                 rdie = (const struct rsn_rdie *) (rpos + 2);
 616                 rpos += 2 + rpos[1];
 617                 start = rpos;
 618
 619                 while (rpos + 2 <= ric + ric_len &&
 620                        rpos + 2 + rpos[1] <= ric + ric_len) {
 621                         if (rpos[0] == WLAN_EID_RIC_DATA)
 622                                 break;
 623                         rpos += 2 + rpos[1];
 624                 }
 625                 pos = wpa_ft_process_rdie(sm, pos, end, rdie->id,
 626                                           rdie->descr_count,
 627                                           start, rpos - start);
 628         }
 629
 630         return pos;
 631 }
 632
 633
 634 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
 635                                  size_t max_len, int auth_alg,
 636                                  const u8 *req_ies, size_t req_ies_len)
 637 {
 638         u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL;
 639         size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0;
 640         int res;
 641         struct wpa_auth_config *conf;
 642         struct rsn_ftie *_ftie;
 643         struct wpa_ft_ies parse;
 644         u8 *ric_start;
 645         u8 *anonce, *snonce;
 646
 647         if (sm == NULL)
 648                 return pos;
 649
 650         conf = &sm->wpa_auth->conf;
 651
 652         if (!wpa_key_mgmt_ft(sm->wpa_key_mgmt))
 653                 return pos;
 654
 655         end = pos + max_len;
 656
 657         if (auth_alg == WLAN_AUTH_FT) {
 658                 /*
 659                  * RSN (only present if this is a Reassociation Response and
 660                  * part of a fast BSS transition)
 661                  */
 662                 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name);
 663                 if (res < 0)
 664                         return pos;
 665                 rsnie = pos;
 666                 rsnie_len = res;
 667                 pos += res;
 668         }
 669
 670         /* Mobility Domain Information */
 671         res = wpa_write_mdie(conf, pos, end - pos);
 672         if (res < 0)
 673                 return pos;
 674         mdie = pos;
 675         mdie_len = res;
 676         pos += res;
 677
 678         /* Fast BSS Transition Information */
 679         if (auth_alg == WLAN_AUTH_FT) {
 680                 subelem = wpa_ft_gtk_subelem(sm, &subelem_len);
 681                 r0kh_id = sm->r0kh_id;
 682                 r0kh_id_len = sm->r0kh_id_len;
 683                 anonce = sm->ANonce;
 684                 snonce = sm->SNonce;
 685 #ifdef CONFIG_IEEE80211W
 686                 if (sm->mgmt_frame_prot) {
 687                         u8 *igtk;
 688                         size_t igtk_len;
 689                         u8 *nbuf;
 690                         igtk = wpa_ft_igtk_subelem(sm, &igtk_len);
 691                         if (igtk == NULL) {
 692                                 os_free(subelem);
 693                                 return pos;
 694                         }
 695                         nbuf = os_realloc(subelem, subelem_len + igtk_len);
 696                         if (nbuf == NULL) {
 697                                 os_free(subelem);
 698                                 os_free(igtk);
 699                                 return pos;
 700                         }
 701                         subelem = nbuf;
 702                         os_memcpy(subelem + subelem_len, igtk, igtk_len);
 703                         subelem_len += igtk_len;
 704                         os_free(igtk);
 705                 }
 706 #endif /* CONFIG_IEEE80211W */
 707         } else {
 708                 r0kh_id = conf->r0_key_holder;
 709                 r0kh_id_len = conf->r0_key_holder_len;
 710                 anonce = NULL;
 711                 snonce = NULL;
 712         }
 713         res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, anonce, snonce, pos,
 714                              end - pos, subelem, subelem_len);
 715         os_free(subelem);
 716         if (res < 0)
 717                 return pos;
 718         ftie = pos;
 719         ftie_len = res;
 720         pos += res;
 721
 722         os_free(sm->assoc_resp_ftie);
 723         sm->assoc_resp_ftie = os_malloc(ftie_len);
 724         if (sm->assoc_resp_ftie)
 725                 os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len);
 726
 727         _ftie = (struct rsn_ftie *) (ftie + 2);
 728         if (auth_alg == WLAN_AUTH_FT)
 729                 _ftie->mic_control[1] = 3; /* Information element count */
 730
 731         ric_start = pos;
 732         if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse) == 0 && parse.ric) {
 733                 pos = wpa_ft_process_ric(sm, pos, end, parse.ric,
 734                                          parse.ric_len);
 735                 if (auth_alg == WLAN_AUTH_FT)
 736                         _ftie->mic_control[1] +=
 737                                 ieee802_11_ie_count(ric_start,
 738                                                     pos - ric_start);
 739         }
 740         if (ric_start == pos)
 741                 ric_start = NULL;
 742
 743         if (auth_alg == WLAN_AUTH_FT &&
 744             wpa_ft_mic(sm->PTK.kck, sm->PTK.kck_len, sm->addr,
 745                        sm->wpa_auth->addr, 6,
 746                        mdie, mdie_len, ftie, ftie_len,
 747                        rsnie, rsnie_len,
 748                        ric_start, ric_start ? pos - ric_start : 0,
 749                        _ftie->mic) < 0)
 750                 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
 751
 752         return pos;
 753 }
 754
 755
 756 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
 757                                    int vlan_id,
 758                                    enum wpa_alg alg, const u8 *addr, int idx,
 759                                    u8 *key, size_t key_len)
 760 {
 761         if (wpa_auth->cb.set_key == NULL)
 762                 return -1;
 763         return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
 764                                     key, key_len);
 765 }
 766
 767
 768 void wpa_ft_install_ptk(struct wpa_state_machine *sm)
 769 {
 770         enum wpa_alg alg;
 771         int klen;
 772
 773         /* MLME-SETKEYS.request(PTK) */
 774         alg = wpa_cipher_to_alg(sm->pairwise);
 775         klen = wpa_cipher_key_len(sm->pairwise);
 776         if (!wpa_cipher_valid_pairwise(sm->pairwise)) {
 777                 wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip "
 778                            "PTK configuration", sm->pairwise);
 779                 return;
 780         }
 781
 782         /* FIX: add STA entry to kernel/driver here? The set_key will fail
 783          * most likely without this.. At the moment, STA entry is added only
 784          * after association has been completed. This function will be called
 785          * again after association to get the PTK configured, but that could be
 786          * optimized by adding the STA entry earlier.
 787          */
 788         if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
 789                              sm->PTK.tk, klen))
 790                 return;
 791
 792         /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
 793         sm->pairwise_set = TRUE;
 794 }
 795
 796
 797 static int wpa_ft_process_auth_req(struct wpa_state_machine *sm,
 798                                    const u8 *ies, size_t ies_len,
 799                                    u8 **resp_ies, size_t *resp_ies_len)
 800 {
 801         struct rsn_mdie *mdie;
 802         struct rsn_ftie *ftie;
 803         u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
 804         u8 ptk_name[WPA_PMK_NAME_LEN];
 805         struct wpa_auth_config *conf;
 806         struct wpa_ft_ies parse;
 807         size_t buflen;
 808         int ret;
 809         u8 *pos, *end;
 810         int pairwise;
 811
 812         *resp_ies = NULL;
 813         *resp_ies_len = 0;
 814
 815         sm->pmk_r1_name_valid = 0;
 816         conf = &sm->wpa_auth->conf;
 817
 818         wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs",
 819                     ies, ies_len);
 820
 821         if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
 822                 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
 823                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 824         }
 825
 826         mdie = (struct rsn_mdie *) parse.mdie;
 827         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
 828             os_memcmp(mdie->mobility_domain,
 829                       sm->wpa_auth->conf.mobility_domain,
 830                       MOBILITY_DOMAIN_ID_LEN) != 0) {
 831                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
 832                 return WLAN_STATUS_INVALID_MDIE;
 833         }
 834
 835         ftie = (struct rsn_ftie *) parse.ftie;
 836         if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
 837                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
 838                 return WLAN_STATUS_INVALID_FTIE;
 839         }
 840
 841         os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
 842
 843         if (parse.r0kh_id == NULL) {
 844                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
 845                 return WLAN_STATUS_INVALID_FTIE;
 846         }
 847
 848         wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID",
 849                     parse.r0kh_id, parse.r0kh_id_len);
 850         os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
 851         sm->r0kh_id_len = parse.r0kh_id_len;
 852
 853         if (parse.rsn_pmkid == NULL) {
 854                 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
 855                 return WLAN_STATUS_INVALID_PMKID;
 856         }
 857
 858         wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
 859                     parse.rsn_pmkid, WPA_PMK_NAME_LEN);
 860         wpa_derive_pmk_r1_name(parse.rsn_pmkid,
 861                                sm->wpa_auth->conf.r1_key_holder, sm->addr,
 862                                pmk_r1_name);
 863         wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
 864                     pmk_r1_name, WPA_PMK_NAME_LEN);
 865
 866         if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1,
 867                     &pairwise) < 0) {
 868                 if (wpa_ft_pull_pmk_r1(sm, ies, ies_len, parse.rsn_pmkid) < 0) {
 869                         wpa_printf(MSG_DEBUG, "FT: Did not have matching "
 870                                    "PMK-R1 and unknown R0KH-ID");
 871                         return WLAN_STATUS_INVALID_PMKID;
 872                 }
 873
 874                 return -1; /* Status pending */
 875         }
 876
 877         wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN);
 878         sm->pmk_r1_name_valid = 1;
 879         os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
 880
 881         if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
 882                 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
 883                            "ANonce");
 884                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 885         }
 886
 887         wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
 888                     sm->SNonce, WPA_NONCE_LEN);
 889         wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
 890                     sm->ANonce, WPA_NONCE_LEN);
 891
 892         if (wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
 893                               sm->wpa_auth->addr, pmk_r1_name,
 894                               &sm->PTK, ptk_name, sm->wpa_key_mgmt,
 895                               pairwise) < 0)
 896                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 897
 898         sm->pairwise = pairwise;
 899         sm->PTK_valid = TRUE;
 900         wpa_ft_install_ptk(sm);
 901
 902         buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
 903                 2 + FT_R1KH_ID_LEN + 200;
 904         *resp_ies = os_zalloc(buflen);
 905         if (*resp_ies == NULL) {
 906                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 907         }
 908
 909         pos = *resp_ies;
 910         end = *resp_ies + buflen;
 911
 912         ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
 913         if (ret < 0) {
 914                 os_free(*resp_ies);
 915                 *resp_ies = NULL;
 916                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 917         }
 918         pos += ret;
 919
 920         ret = wpa_write_mdie(conf, pos, end - pos);
 921         if (ret < 0) {
 922                 os_free(*resp_ies);
 923                 *resp_ies = NULL;
 924                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 925         }
 926         pos += ret;
 927
 928         ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len,
 929                              sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0);
 930         if (ret < 0) {
 931                 os_free(*resp_ies);
 932                 *resp_ies = NULL;
 933                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 934         }
 935         pos += ret;
 936
 937         *resp_ies_len = pos - *resp_ies;
 938
 939         return WLAN_STATUS_SUCCESS;
 940 }
 941
 942
 943 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
 944                          u16 auth_transaction, const u8 *ies, size_t ies_len,
 945                          void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
 946                                     u16 auth_transaction, u16 status,
 947                                     const u8 *ies, size_t ies_len),
 948                          void *ctx)
 949 {
 950         u16 status;
 951         u8 *resp_ies;
 952         size_t resp_ies_len;
 953         int res;
 954
 955         if (sm == NULL) {
 956                 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but "
 957                            "WPA SM not available");
 958                 return;
 959         }
 960
 961         wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR
 962                    " BSSID=" MACSTR " transaction=%d",
 963                    MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction);
 964         sm->ft_pending_cb = cb;
 965         sm->ft_pending_cb_ctx = ctx;
 966         sm->ft_pending_auth_transaction = auth_transaction;
 967         res = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
 968                                       &resp_ies_len);
 969         if (res < 0) {
 970                 wpa_printf(MSG_DEBUG, "FT: Callback postponed until response is available");
 971                 return;
 972         }
 973         status = res;
 974
 975         wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
 976                    " auth_transaction=%d status=%d",
 977                    MAC2STR(sm->addr), auth_transaction + 1, status);
 978         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
 979         cb(ctx, sm->addr, bssid, auth_transaction + 1, status,
 980            resp_ies, resp_ies_len);
 981         os_free(resp_ies);
 982 }
 983
 984
 985 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
 986                             size_t ies_len)
 987 {
 988         struct wpa_ft_ies parse;
 989         struct rsn_mdie *mdie;
 990         struct rsn_ftie *ftie;
 991         u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
 992         size_t mic_len = 16;
 993         unsigned int count;
 994
 995         if (sm == NULL)
 996                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 997
 998         wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);
 999
1000         if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
1001                 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
1002                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1003         }
1004
1005         if (parse.rsn == NULL) {
1006                 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req");
1007                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1008         }
1009
1010         if (parse.rsn_pmkid == NULL) {
1011                 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
1012                 return WLAN_STATUS_INVALID_PMKID;
1013         }
1014
1015         if (os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)
1016             != 0) {
1017                 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match "
1018                            "with the PMKR1Name derived from auth request");
1019                 return WLAN_STATUS_INVALID_PMKID;
1020         }
1021
1022         mdie = (struct rsn_mdie *) parse.mdie;
1023         if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
1024             os_memcmp(mdie->mobility_domain,
1025                       sm->wpa_auth->conf.mobility_domain,
1026                       MOBILITY_DOMAIN_ID_LEN) != 0) {
1027                 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
1028                 return WLAN_STATUS_INVALID_MDIE;
1029         }
1030
1031         ftie = (struct rsn_ftie *) parse.ftie;
1032         if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
1033                 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
1034                 return WLAN_STATUS_INVALID_FTIE;
1035         }
1036
1037         if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) {
1038                 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
1039                 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
1040                             ftie->snonce, WPA_NONCE_LEN);
1041                 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
1042                             sm->SNonce, WPA_NONCE_LEN);
1043                 return -1;
1044         }
1045
1046         if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) {
1047                 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
1048                 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
1049                             ftie->anonce, WPA_NONCE_LEN);
1050                 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
1051                             sm->ANonce, WPA_NONCE_LEN);
1052                 return -1;
1053         }
1054
1055
1056         if (parse.r0kh_id == NULL) {
1057                 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
1058                 return -1;
1059         }
1060
1061         if (parse.r0kh_id_len != sm->r0kh_id_len ||
1062             os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
1063         {
1064                 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
1065                            "the current R0KH-ID");
1066                 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
1067                             parse.r0kh_id, parse.r0kh_id_len);
1068                 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
1069                             sm->r0kh_id, sm->r0kh_id_len);
1070                 return -1;
1071         }
1072
1073         if (parse.r1kh_id == NULL) {
1074                 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
1075                 return -1;
1076         }
1077
1078         if (os_memcmp_const(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder,
1079                             FT_R1KH_ID_LEN) != 0) {
1080                 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
1081                            "ReassocReq");
1082                 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE",
1083                             parse.r1kh_id, FT_R1KH_ID_LEN);
1084                 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID",
1085                             sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
1086                 return -1;
1087         }
1088
1089         if (parse.rsn_pmkid == NULL ||
1090             os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
1091         {
1092                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
1093                            "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
1094                 return -1;
1095         }
1096
1097         count = 3;
1098         if (parse.ric)
1099                 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
1100         if (ftie->mic_control[1] != count) {
1101                 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
1102                            "Control: received %u expected %u",
1103                            ftie->mic_control[1], count);
1104                 return -1;
1105         }
1106
1107         if (wpa_ft_mic(sm->PTK.kck, sm->PTK.kck_len, sm->addr,
1108                        sm->wpa_auth->addr, 5,
1109                        parse.mdie - 2, parse.mdie_len + 2,
1110                        parse.ftie - 2, parse.ftie_len + 2,
1111                        parse.rsn - 2, parse.rsn_len + 2,
1112                        parse.ric, parse.ric_len,
1113                        mic) < 0) {
1114                 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
1115                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1116         }
1117
1118         if (os_memcmp_const(mic, ftie->mic, mic_len) != 0) {
1119                 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
1120                 wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR,
1121                            MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr));
1122                 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC",
1123                             ftie->mic, mic_len);
1124                 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len);
1125                 wpa_hexdump(MSG_MSGDUMP, "FT: MDIE",
1126                             parse.mdie - 2, parse.mdie_len + 2);
1127                 wpa_hexdump(MSG_MSGDUMP, "FT: FTIE",
1128                             parse.ftie - 2, parse.ftie_len + 2);
1129                 wpa_hexdump(MSG_MSGDUMP, "FT: RSN",
1130                             parse.rsn - 2, parse.rsn_len + 2);
1131                 return WLAN_STATUS_INVALID_FTIE;
1132         }
1133
1134         return WLAN_STATUS_SUCCESS;
1135 }
1136
1137
1138 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len)
1139 {
1140         const u8 *sta_addr, *target_ap;
1141         const u8 *ies;
1142         size_t ies_len;
1143         u8 action;
1144         struct ft_rrb_frame *frame;
1145
1146         if (sm == NULL)
1147                 return -1;
1148
1149         /*
1150          * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1151          * FT Request action frame body[variable]
1152          */
1153
1154         if (len < 14) {
1155                 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame "
1156                            "(len=%lu)", (unsigned long) len);
1157                 return -1;
1158         }
1159
1160         action = data[1];
1161         sta_addr = data + 2;
1162         target_ap = data + 8;
1163         ies = data + 14;
1164         ies_len = len - 14;
1165
1166         wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR
1167                    " Target AP=" MACSTR " Action=%d)",
1168                    MAC2STR(sta_addr), MAC2STR(target_ap), action);
1169
1170         if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) {
1171                 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: "
1172                            "STA=" MACSTR " STA-Address=" MACSTR,
1173                            MAC2STR(sm->addr), MAC2STR(sta_addr));
1174                 return -1;
1175         }
1176
1177         /*
1178          * Do some sanity checking on the target AP address (not own and not
1179          * broadcast. This could be extended to filter based on a list of known
1180          * APs in the MD (if such a list were configured).
1181          */
1182         if ((target_ap[0] & 0x01) ||
1183             os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) {
1184                 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action "
1185                            "frame");
1186                 return -1;
1187         }
1188
1189         wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len);
1190
1191         /* RRB - Forward action frame to the target AP */
1192         frame = os_malloc(sizeof(*frame) + len);
1193         if (frame == NULL)
1194                 return -1;
1195         frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1196         frame->packet_type = FT_PACKET_REQUEST;
1197         frame->action_length = host_to_le16(len);
1198         os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
1199         os_memcpy(frame + 1, data, len);
1200
1201         wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
1202                         sizeof(*frame) + len);
1203         os_free(frame);
1204
1205         return 0;
1206 }
1207
1208
1209 static void wpa_ft_rrb_rx_request_cb(void *ctx, const u8 *dst, const u8 *bssid,
1210                                      u16 auth_transaction, u16 resp,
1211                                      const u8 *ies, size_t ies_len)
1212 {
1213         struct wpa_state_machine *sm = ctx;
1214         wpa_printf(MSG_DEBUG, "FT: Over-the-DS RX request cb for " MACSTR,
1215                    MAC2STR(sm->addr));
1216         wpa_ft_send_rrb_auth_resp(sm, sm->ft_pending_current_ap, sm->addr,
1217                                   WLAN_STATUS_SUCCESS, ies, ies_len);
1218 }
1219
1220
1221 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
1222                                  const u8 *current_ap, const u8 *sta_addr,
1223                                  const u8 *body, size_t len)
1224 {
1225         struct wpa_state_machine *sm;
1226         u16 status;
1227         u8 *resp_ies;
1228         size_t resp_ies_len;
1229         int res;
1230
1231         sm = wpa_ft_add_sta(wpa_auth, sta_addr);
1232         if (sm == NULL) {
1233                 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
1234                            "RRB Request");
1235                 return -1;
1236         }
1237
1238         wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
1239
1240         sm->ft_pending_cb = wpa_ft_rrb_rx_request_cb;
1241         sm->ft_pending_cb_ctx = sm;
1242         os_memcpy(sm->ft_pending_current_ap, current_ap, ETH_ALEN);
1243         res = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
1244                                       &resp_ies_len);
1245         if (res < 0) {
1246                 wpa_printf(MSG_DEBUG, "FT: No immediate response available - wait for pull response");
1247                 return 0;
1248         }
1249         status = res;
1250
1251         res = wpa_ft_send_rrb_auth_resp(sm, current_ap, sta_addr, status,
1252                                         resp_ies, resp_ies_len);
1253         os_free(resp_ies);
1254         return res;
1255 }
1256
1257
1258 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
1259                                      const u8 *current_ap, const u8 *sta_addr,
1260                                      u16 status, const u8 *resp_ies,
1261                                      size_t resp_ies_len)
1262 {
1263         struct wpa_authenticator *wpa_auth = sm->wpa_auth;
1264         size_t rlen;
1265         struct ft_rrb_frame *frame;
1266         u8 *pos;
1267
1268         wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
1269                    " CurrentAP=" MACSTR " status=%d",
1270                    MAC2STR(sm->addr), MAC2STR(current_ap), status);
1271         wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
1272
1273         /* RRB - Forward action frame response to the Current AP */
1274
1275         /*
1276          * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1277          * Status_Code[2] FT Request action frame body[variable]
1278          */
1279         rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;
1280
1281         frame = os_malloc(sizeof(*frame) + rlen);
1282         if (frame == NULL)
1283                 return -1;
1284         frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1285         frame->packet_type = FT_PACKET_RESPONSE;
1286         frame->action_length = host_to_le16(rlen);
1287         os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
1288         pos = (u8 *) (frame + 1);
1289         *pos++ = WLAN_ACTION_FT;
1290         *pos++ = 2; /* Action: Response */
1291         os_memcpy(pos, sta_addr, ETH_ALEN);
1292         pos += ETH_ALEN;
1293         os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
1294         pos += ETH_ALEN;
1295         WPA_PUT_LE16(pos, status);
1296         pos += 2;
1297         if (resp_ies)
1298                 os_memcpy(pos, resp_ies, resp_ies_len);
1299
1300         wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
1301                         sizeof(*frame) + rlen);
1302         os_free(frame);
1303
1304         return 0;
1305 }
1306
1307
1308 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
1309                               const u8 *src_addr,
1310                               const u8 *data, size_t data_len)
1311 {
1312         struct ft_r0kh_r1kh_pull_frame f;
1313         const u8 *crypt;
1314         u8 *plain;
1315         struct ft_remote_r1kh *r1kh;
1316         struct ft_r0kh_r1kh_resp_frame resp, r;
1317         u8 pmk_r0[PMK_LEN];
1318         int pairwise;
1319
1320         wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
1321
1322         if (data_len < sizeof(f))
1323                 return -1;
1324
1325         r1kh = wpa_auth->conf.r1kh_list;
1326         while (r1kh) {
1327                 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0)
1328                         break;
1329                 r1kh = r1kh->next;
1330         }
1331         if (r1kh == NULL) {
1332                 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for "
1333                            "PMK-R1 pull source address " MACSTR,
1334                            MAC2STR(src_addr));
1335                 return -1;
1336         }
1337
1338         crypt = data + offsetof(struct ft_r0kh_r1kh_pull_frame, nonce);
1339         os_memset(&f, 0, sizeof(f));
1340         plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_pull_frame, nonce);
1341         /* aes_unwrap() does not support inplace decryption, so use a temporary
1342          * buffer for the data. */
1343         if (aes_unwrap(r1kh->key, sizeof(r1kh->key),
1344                        (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
1345                        crypt, plain) < 0) {
1346                 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1347                            "request from " MACSTR, MAC2STR(src_addr));
1348                 return -1;
1349         }
1350
1351         wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1352                     f.nonce, sizeof(f.nonce));
1353         wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name",
1354                     f.pmk_r0_name, WPA_PMK_NAME_LEN);
1355         wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID="
1356                    MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
1357
1358         os_memset(&resp, 0, sizeof(resp));
1359         resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1360         resp.packet_type = FT_PACKET_R0KH_R1KH_RESP;
1361         resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN);
1362         os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN);
1363
1364         /* aes_wrap() does not support inplace encryption, so use a temporary
1365          * buffer for the data. */
1366         os_memcpy(r.nonce, f.nonce, sizeof(f.nonce));
1367         os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN);
1368         os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN);
1369         if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0,
1370                                 &pairwise) < 0) {
1371                 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for "
1372                            "PMK-R1 pull");
1373                 return -1;
1374         }
1375
1376         wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id,
1377                           r.pmk_r1, r.pmk_r1_name);
1378         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN);
1379         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name,
1380                     WPA_PMK_NAME_LEN);
1381         r.pairwise = host_to_le16(pairwise);
1382         os_memset(r.pad, 0, sizeof(r.pad));
1383
1384         if (aes_wrap(r1kh->key, sizeof(r1kh->key),
1385                      (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1386                      r.nonce, resp.nonce) < 0) {
1387                 os_memset(pmk_r0, 0, PMK_LEN);
1388                 return -1;
1389         }
1390
1391         os_memset(pmk_r0, 0, PMK_LEN);
1392
1393         wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp));
1394
1395         return 0;
1396 }
1397
1398
1399 static void ft_pull_resp_cb_finish(void *eloop_ctx, void *timeout_ctx)
1400 {
1401         struct wpa_state_machine *sm = eloop_ctx;
1402         int res;
1403         u8 *resp_ies;
1404         size_t resp_ies_len;
1405         u16 status;
1406
1407         res = wpa_ft_process_auth_req(sm, wpabuf_head(sm->ft_pending_req_ies),
1408                                       wpabuf_len(sm->ft_pending_req_ies),
1409                                       &resp_ies, &resp_ies_len);
1410         wpabuf_free(sm->ft_pending_req_ies);
1411         sm->ft_pending_req_ies = NULL;
1412         if (res < 0)
1413                 res = WLAN_STATUS_UNSPECIFIED_FAILURE;
1414         status = res;
1415         wpa_printf(MSG_DEBUG, "FT: Postponed auth callback result for " MACSTR
1416                    " - status %u", MAC2STR(sm->addr), status);
1417
1418         sm->ft_pending_cb(sm->ft_pending_cb_ctx, sm->addr, sm->wpa_auth->addr,
1419                           sm->ft_pending_auth_transaction + 1, status,
1420                           resp_ies, resp_ies_len);
1421         os_free(resp_ies);
1422 }
1423
1424
1425 static int ft_pull_resp_cb(struct wpa_state_machine *sm, void *ctx)
1426 {
1427         struct ft_r0kh_r1kh_resp_frame *frame = ctx;
1428
1429         if (os_memcmp(frame->s1kh_id, sm->addr, ETH_ALEN) != 0)
1430                 return 0;
1431         if (os_memcmp(frame->nonce, sm->ft_pending_pull_nonce,
1432                       FT_R0KH_R1KH_PULL_NONCE_LEN) != 0)
1433                 return 0;
1434         if (sm->ft_pending_cb == NULL || sm->ft_pending_req_ies == NULL)
1435                 return 0;
1436
1437         wpa_printf(MSG_DEBUG, "FT: Response to a pending pull request for "
1438                    MACSTR " - process from timeout", MAC2STR(sm->addr));
1439         eloop_register_timeout(0, 0, ft_pull_resp_cb_finish, sm, NULL);
1440         return 1;
1441 }
1442
1443
1444 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
1445                               const u8 *src_addr,
1446                               const u8 *data, size_t data_len)
1447 {
1448         struct ft_r0kh_r1kh_resp_frame f;
1449         const u8 *crypt;
1450         u8 *plain;
1451         struct ft_remote_r0kh *r0kh;
1452         int pairwise, res;
1453
1454         wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
1455
1456         if (data_len < sizeof(f))
1457                 return -1;
1458
1459         r0kh = wpa_auth->conf.r0kh_list;
1460         while (r0kh) {
1461                 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1462                         break;
1463                 r0kh = r0kh->next;
1464         }
1465         if (r0kh == NULL) {
1466                 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1467                            "PMK-R0 pull response source address " MACSTR,
1468                            MAC2STR(src_addr));
1469                 return -1;
1470         }
1471
1472         crypt = data + offsetof(struct ft_r0kh_r1kh_resp_frame, nonce);
1473         os_memset(&f, 0, sizeof(f));
1474         plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_resp_frame, nonce);
1475         /* aes_unwrap() does not support inplace decryption, so use a temporary
1476          * buffer for the data. */
1477         if (aes_unwrap(r0kh->key, sizeof(r0kh->key),
1478                        (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1479                        crypt, plain) < 0) {
1480                 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1481                            "response from " MACSTR, MAC2STR(src_addr));
1482                 return -1;
1483         }
1484
1485         if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder,
1486                             FT_R1KH_ID_LEN) != 0) {
1487                 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a "
1488                            "matching R1KH-ID");
1489                 return -1;
1490         }
1491
1492         pairwise = le_to_host16(f.pairwise);
1493         wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1494                     f.nonce, sizeof(f.nonce));
1495         wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID="
1496                    MACSTR " pairwise=0x%x",
1497                    MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1498         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1",
1499                         f.pmk_r1, PMK_LEN);
1500         wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name",
1501                         f.pmk_r1_name, WPA_PMK_NAME_LEN);
1502
1503         res = wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1504                                   pairwise);
1505         wpa_printf(MSG_DEBUG, "FT: Look for pending pull request");
1506         wpa_auth_for_each_sta(wpa_auth, ft_pull_resp_cb, &f);
1507         os_memset(f.pmk_r1, 0, PMK_LEN);
1508
1509         return res ? 0 : -1;
1510 }
1511
1512
1513 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
1514                               const u8 *src_addr,
1515                               const u8 *data, size_t data_len)
1516 {
1517         struct ft_r0kh_r1kh_push_frame f;
1518         const u8 *crypt;
1519         u8 *plain;
1520         struct ft_remote_r0kh *r0kh;
1521         struct os_time now;
1522         os_time_t tsend;
1523         int pairwise;
1524
1525         wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
1526
1527         if (data_len < sizeof(f))
1528                 return -1;
1529
1530         r0kh = wpa_auth->conf.r0kh_list;
1531         while (r0kh) {
1532                 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1533                         break;
1534                 r0kh = r0kh->next;
1535         }
1536         if (r0kh == NULL) {
1537                 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1538                            "PMK-R0 push source address " MACSTR,
1539                            MAC2STR(src_addr));
1540                 return -1;
1541         }
1542
1543         crypt = data + offsetof(struct ft_r0kh_r1kh_push_frame, timestamp);
1544         os_memset(&f, 0, sizeof(f));
1545         plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_push_frame,
1546                                        timestamp);
1547         /* aes_unwrap() does not support inplace decryption, so use a temporary
1548          * buffer for the data. */
1549         if (aes_unwrap(r0kh->key, sizeof(r0kh->key),
1550                        (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1551                        crypt, plain) < 0) {
1552                 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from "
1553                            MACSTR, MAC2STR(src_addr));
1554                 return -1;
1555         }
1556
1557         os_get_time(&now);
1558         tsend = WPA_GET_LE32(f.timestamp);
1559         if ((now.sec > tsend && now.sec - tsend > 60) ||
1560             (now.sec < tsend && tsend - now.sec > 60)) {
1561                 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid "
1562                            "timestamp: sender time %d own time %d\n",
1563                            (int) tsend, (int) now.sec);
1564                 return -1;
1565         }
1566
1567         if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder,
1568                             FT_R1KH_ID_LEN) != 0) {
1569                 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching "
1570                            "R1KH-ID (received " MACSTR " own " MACSTR ")",
1571                            MAC2STR(f.r1kh_id),
1572                            MAC2STR(wpa_auth->conf.r1_key_holder));
1573                 return -1;
1574         }
1575
1576         pairwise = le_to_host16(f.pairwise);
1577         wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID="
1578                    MACSTR " pairwise=0x%x",
1579                    MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1580         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1",
1581                         f.pmk_r1, PMK_LEN);
1582         wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name",
1583                         f.pmk_r1_name, WPA_PMK_NAME_LEN);
1584
1585         wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1586                             pairwise);
1587         os_memset(f.pmk_r1, 0, PMK_LEN);
1588
1589         return 0;
1590 }
1591
1592
1593 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
1594                   const u8 *data, size_t data_len)
1595 {
1596         struct ft_rrb_frame *frame;
1597         u16 alen;
1598         const u8 *pos, *end, *start;
1599         u8 action;
1600         const u8 *sta_addr, *target_ap_addr;
1601
1602         wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
1603                    MAC2STR(src_addr));
1604
1605         if (data_len < sizeof(*frame)) {
1606                 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
1607                            (unsigned long) data_len);
1608                 return -1;
1609         }
1610
1611         pos = data;
1612         frame = (struct ft_rrb_frame *) pos;
1613         pos += sizeof(*frame);
1614
1615         alen = le_to_host16(frame->action_length);
1616         wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
1617                    "action_length=%d ap_address=" MACSTR,
1618                    frame->frame_type, frame->packet_type, alen,
1619                    MAC2STR(frame->ap_address));
1620
1621         if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
1622                 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */
1623                 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
1624                            "unrecognized type %d", frame->frame_type);
1625                 return -1;
1626         }
1627
1628         if (alen > data_len - sizeof(*frame)) {
1629                 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
1630                            "frame");
1631                 return -1;
1632         }
1633
1634         if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL)
1635                 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len);
1636         if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP)
1637                 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len);
1638         if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH)
1639                 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len);
1640
1641         wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);
1642
1643         if (alen < 1 + 1 + 2 * ETH_ALEN) {
1644                 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
1645                            "room for Action Frame body); alen=%lu",
1646                            (unsigned long) alen);
1647                 return -1;
1648         }
1649         start = pos;
1650         end = pos + alen;
1651
1652         if (*pos != WLAN_ACTION_FT) {
1653                 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
1654                            "%d", *pos);
1655                 return -1;
1656         }
1657
1658         pos++;
1659         action = *pos++;
1660         sta_addr = pos;
1661         pos += ETH_ALEN;
1662         target_ap_addr = pos;
1663         pos += ETH_ALEN;
1664         wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
1665                    MACSTR " target_ap_addr=" MACSTR,
1666                    action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));
1667
1668         if (frame->packet_type == FT_PACKET_REQUEST) {
1669                 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");
1670
1671                 if (action != 1) {
1672                         wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
1673                                    "RRB Request", action);
1674                         return -1;
1675                 }
1676
1677                 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
1678                         wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
1679                                    "RRB Request does not match with own "
1680                                    "address");
1681                         return -1;
1682                 }
1683
1684                 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
1685                                           sta_addr, pos, end - pos) < 0)
1686                         return -1;
1687         } else if (frame->packet_type == FT_PACKET_RESPONSE) {
1688                 u16 status_code;
1689
1690                 if (end - pos < 2) {
1691                         wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
1692                                    "code in RRB Response");
1693                         return -1;
1694                 }
1695                 status_code = WPA_GET_LE16(pos);
1696                 pos += 2;
1697
1698                 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
1699                            "(status_code=%d)", status_code);
1700
1701                 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
1702                         return -1;
1703         } else {
1704                 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
1705                            "packet_type %d", frame->packet_type);
1706                 return -1;
1707         }
1708
1709         if (end > pos) {
1710                 wpa_hexdump(MSG_DEBUG, "FT: Ignore extra data in end",
1711                             pos, end - pos);
1712         }
1713
1714         return 0;
1715 }
1716
1717
1718 static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
1719                                    struct wpa_ft_pmk_r0_sa *pmk_r0,
1720                                    struct ft_remote_r1kh *r1kh,
1721                                    const u8 *s1kh_id, int pairwise)
1722 {
1723         struct ft_r0kh_r1kh_push_frame frame, f;
1724         struct os_time now;
1725         const u8 *plain;
1726         u8 *crypt;
1727
1728         os_memset(&frame, 0, sizeof(frame));
1729         frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1730         frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH;
1731         frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN);
1732         os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);
1733
1734         /* aes_wrap() does not support inplace encryption, so use a temporary
1735          * buffer for the data. */
1736         os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN);
1737         os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
1738         os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN);
1739         wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id,
1740                           s1kh_id, f.pmk_r1, f.pmk_r1_name);
1741         wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id));
1742         wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN);
1743         wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name,
1744                     WPA_PMK_NAME_LEN);
1745         os_get_time(&now);
1746         WPA_PUT_LE32(f.timestamp, now.sec);
1747         f.pairwise = host_to_le16(pairwise);
1748         os_memset(f.pad, 0, sizeof(f.pad));
1749         plain = ((const u8 *) &f) + offsetof(struct ft_r0kh_r1kh_push_frame,
1750                                              timestamp);
1751         crypt = ((u8 *) &frame) + offsetof(struct ft_r0kh_r1kh_push_frame,
1752                                            timestamp);
1753         if (aes_wrap(r1kh->key, sizeof(r1kh->key),
1754                      (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1755                      plain, crypt) < 0)
1756                 return;
1757
1758         wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame));
1759 }
1760
1761
1762 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
1763 {
1764         struct wpa_ft_pmk_r0_sa *r0;
1765         struct ft_remote_r1kh *r1kh;
1766
1767         if (!wpa_auth->conf.pmk_r1_push)
1768                 return;
1769
1770         r0 = wpa_auth->ft_pmk_cache->pmk_r0;
1771         while (r0) {
1772                 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0)
1773                         break;
1774                 r0 = r0->next;
1775         }
1776
1777         if (r0 == NULL || r0->pmk_r1_pushed)
1778                 return;
1779         r0->pmk_r1_pushed = 1;
1780
1781         wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
1782                    "for STA " MACSTR, MAC2STR(addr));
1783
1784         r1kh = wpa_auth->conf.r1kh_list;
1785         while (r1kh) {
1786                 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise);
1787                 r1kh = r1kh->next;
1788         }
1789 }
1790
1791 #endif /* CONFIG_IEEE80211R */