wpa_supplicant/ibss_rsn.c

   1 /*
   2  * wpa_supplicant - IBSS RSN
   3  * Copyright (c) 2009-2013, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10
  11 #include "common.h"
  12 #include "common/wpa_ctrl.h"
  13 #include "l2_packet/l2_packet.h"
  14 #include "rsn_supp/wpa.h"
  15 #include "rsn_supp/wpa_ie.h"
  16 #include "ap/wpa_auth.h"
  17 #include "wpa_supplicant_i.h"
  18 #include "driver_i.h"
  19 #include "common/ieee802_11_defs.h"
  20 #include "ibss_rsn.h"
  21
  22
  23 static struct ibss_rsn_peer * ibss_rsn_get_peer(struct ibss_rsn *ibss_rsn,
  24                                                 const u8 *addr)
  25 {
  26         struct ibss_rsn_peer *peer;
  27
  28         for (peer = ibss_rsn->peers; peer; peer = peer->next)
  29                 if (os_memcmp(addr, peer->addr, ETH_ALEN) == 0)
  30                         break;
  31         return peer;
  32 }
  33
  34
  35 static void ibss_rsn_free(struct ibss_rsn_peer *peer)
  36 {
  37         wpa_auth_sta_deinit(peer->auth);
  38         wpa_sm_deinit(peer->supp);
  39         os_free(peer);
  40 }
  41
  42
  43 static void supp_set_state(void *ctx, enum wpa_states state)
  44 {
  45         struct ibss_rsn_peer *peer = ctx;
  46         peer->supp_state = state;
  47 }
  48
  49
  50 static enum wpa_states supp_get_state(void *ctx)
  51 {
  52         struct ibss_rsn_peer *peer = ctx;
  53         return peer->supp_state;
  54 }
  55
  56
  57 static int supp_ether_send(void *ctx, const u8 *dest, u16 proto, const u8 *buf,
  58                            size_t len)
  59 {
  60         struct ibss_rsn_peer *peer = ctx;
  61         struct wpa_supplicant *wpa_s = peer->ibss_rsn->wpa_s;
  62
  63         wpa_printf(MSG_DEBUG, "SUPP: %s(dest=" MACSTR " proto=0x%04x "
  64                    "len=%lu)",
  65                    __func__, MAC2STR(dest), proto, (unsigned long) len);
  66
  67         if (wpa_s->l2)
  68                 return l2_packet_send(wpa_s->l2, dest, proto, buf, len);
  69
  70         return wpa_drv_send_eapol(wpa_s, dest, proto, buf, len);
  71 }
  72
  73
  74 static u8 * supp_alloc_eapol(void *ctx, u8 type, const void *data,
  75                              u16 data_len, size_t *msg_len, void **data_pos)
  76 {
  77         struct ieee802_1x_hdr *hdr;
  78
  79         wpa_printf(MSG_DEBUG, "SUPP: %s(type=%d data_len=%d)",
  80                    __func__, type, data_len);
  81
  82         *msg_len = sizeof(*hdr) + data_len;
  83         hdr = os_malloc(*msg_len);
  84         if (hdr == NULL)
  85                 return NULL;
  86
  87         hdr->version = 2;
  88         hdr->type = type;
  89         hdr->length = host_to_be16(data_len);
  90
  91         if (data)
  92                 os_memcpy(hdr + 1, data, data_len);
  93         else
  94                 os_memset(hdr + 1, 0, data_len);
  95
  96         if (data_pos)
  97                 *data_pos = hdr + 1;
  98
  99         return (u8 *) hdr;
 100 }
 101
 102
 103 static int supp_get_beacon_ie(void *ctx)
 104 {
 105         struct ibss_rsn_peer *peer = ctx;
 106
 107         wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
 108         /* TODO: get correct RSN IE */
 109         return wpa_sm_set_ap_rsn_ie(peer->supp,
 110                                     (u8 *) "\x30\x14\x01\x00"
 111                                     "\x00\x0f\xac\x04"
 112                                     "\x01\x00\x00\x0f\xac\x04"
 113                                     "\x01\x00\x00\x0f\xac\x02"
 114                                     "\x00\x00", 22);
 115 }
 116
 117
 118 static void ibss_check_rsn_completed(struct ibss_rsn_peer *peer)
 119 {
 120         struct wpa_supplicant *wpa_s = peer->ibss_rsn->wpa_s;
 121
 122         if ((peer->authentication_status &
 123              (IBSS_RSN_SET_PTK_SUPP | IBSS_RSN_SET_PTK_AUTH)) !=
 124             (IBSS_RSN_SET_PTK_SUPP | IBSS_RSN_SET_PTK_AUTH))
 125                 return;
 126         if (peer->authentication_status & IBSS_RSN_REPORTED_PTK)
 127                 return;
 128         peer->authentication_status |= IBSS_RSN_REPORTED_PTK;
 129         wpa_msg(wpa_s, MSG_INFO, IBSS_RSN_COMPLETED MACSTR,
 130                 MAC2STR(peer->addr));
 131 }
 132
 133
 134 static int supp_set_key(void *ctx, enum wpa_alg alg,
 135                         const u8 *addr, int key_idx, int set_tx,
 136                         const u8 *seq, size_t seq_len,
 137                         const u8 *key, size_t key_len)
 138 {
 139         struct ibss_rsn_peer *peer = ctx;
 140
 141         wpa_printf(MSG_DEBUG, "SUPP: %s(alg=%d addr=" MACSTR " key_idx=%d "
 142                    "set_tx=%d)",
 143                    __func__, alg, MAC2STR(addr), key_idx, set_tx);
 144         wpa_hexdump(MSG_DEBUG, "SUPP: set_key - seq", seq, seq_len);
 145         wpa_hexdump_key(MSG_DEBUG, "SUPP: set_key - key", key, key_len);
 146
 147         if (key_idx == 0) {
 148                 peer->authentication_status |= IBSS_RSN_SET_PTK_SUPP;
 149                 ibss_check_rsn_completed(peer);
 150                 /*
 151                  * In IBSS RSN, the pairwise key from the 4-way handshake
 152                  * initiated by the peer with highest MAC address is used.
 153                  */
 154                 if (os_memcmp(peer->ibss_rsn->wpa_s->own_addr, peer->addr,
 155                               ETH_ALEN) > 0) {
 156                         wpa_printf(MSG_DEBUG, "SUPP: Do not use this PTK");
 157                         return 0;
 158                 }
 159         }
 160
 161         if (is_broadcast_ether_addr(addr))
 162                 addr = peer->addr;
 163         return wpa_drv_set_key(peer->ibss_rsn->wpa_s, alg, addr, key_idx,
 164                                set_tx, seq, seq_len, key, key_len);
 165 }
 166
 167
 168 static void * supp_get_network_ctx(void *ctx)
 169 {
 170         struct ibss_rsn_peer *peer = ctx;
 171         return wpa_supplicant_get_ssid(peer->ibss_rsn->wpa_s);
 172 }
 173
 174
 175 static int supp_mlme_setprotection(void *ctx, const u8 *addr,
 176                                    int protection_type, int key_type)
 177 {
 178         wpa_printf(MSG_DEBUG, "SUPP: %s(addr=" MACSTR " protection_type=%d "
 179                    "key_type=%d)",
 180                    __func__, MAC2STR(addr), protection_type, key_type);
 181         return 0;
 182 }
 183
 184
 185 static void supp_cancel_auth_timeout(void *ctx)
 186 {
 187         wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
 188 }
 189
 190
 191 static void supp_deauthenticate(void * ctx, int reason_code)
 192 {
 193         wpa_printf(MSG_DEBUG, "SUPP: %s (TODO)", __func__);
 194 }
 195
 196
 197 static int ibss_rsn_supp_init(struct ibss_rsn_peer *peer, const u8 *own_addr,
 198                               const u8 *psk)
 199 {
 200         struct wpa_sm_ctx *ctx = os_zalloc(sizeof(*ctx));
 201         if (ctx == NULL)
 202                 return -1;
 203
 204         ctx->ctx = peer;
 205         ctx->msg_ctx = peer->ibss_rsn->wpa_s;
 206         ctx->set_state = supp_set_state;
 207         ctx->get_state = supp_get_state;
 208         ctx->ether_send = supp_ether_send;
 209         ctx->get_beacon_ie = supp_get_beacon_ie;
 210         ctx->alloc_eapol = supp_alloc_eapol;
 211         ctx->set_key = supp_set_key;
 212         ctx->get_network_ctx = supp_get_network_ctx;
 213         ctx->mlme_setprotection = supp_mlme_setprotection;
 214         ctx->cancel_auth_timeout = supp_cancel_auth_timeout;
 215         ctx->deauthenticate = supp_deauthenticate;
 216         peer->supp = wpa_sm_init(ctx);
 217         if (peer->supp == NULL) {
 218                 wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_init() failed");
 219                 return -1;
 220         }
 221
 222         wpa_sm_set_own_addr(peer->supp, own_addr);
 223         wpa_sm_set_param(peer->supp, WPA_PARAM_RSN_ENABLED, 1);
 224         wpa_sm_set_param(peer->supp, WPA_PARAM_PROTO, WPA_PROTO_RSN);
 225         wpa_sm_set_param(peer->supp, WPA_PARAM_PAIRWISE, WPA_CIPHER_CCMP);
 226         wpa_sm_set_param(peer->supp, WPA_PARAM_GROUP, WPA_CIPHER_CCMP);
 227         wpa_sm_set_param(peer->supp, WPA_PARAM_KEY_MGMT, WPA_KEY_MGMT_PSK);
 228         wpa_sm_set_pmk(peer->supp, psk, PMK_LEN);
 229
 230         peer->supp_ie_len = sizeof(peer->supp_ie);
 231         if (wpa_sm_set_assoc_wpa_ie_default(peer->supp, peer->supp_ie,
 232                                             &peer->supp_ie_len) < 0) {
 233                 wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_set_assoc_wpa_ie_default()"
 234                            " failed");
 235                 return -1;
 236         }
 237
 238         wpa_sm_notify_assoc(peer->supp, peer->addr);
 239
 240         return 0;
 241 }
 242
 243
 244 static void auth_logger(void *ctx, const u8 *addr, logger_level level,
 245                         const char *txt)
 246 {
 247         if (addr)
 248                 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " - %s",
 249                            MAC2STR(addr), txt);
 250         else
 251                 wpa_printf(MSG_DEBUG, "AUTH: %s", txt);
 252 }
 253
 254
 255 static const u8 * auth_get_psk(void *ctx, const u8 *addr, const u8 *prev_psk)
 256 {
 257         struct ibss_rsn *ibss_rsn = ctx;
 258         wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",
 259                    __func__, MAC2STR(addr), prev_psk);
 260         if (prev_psk)
 261                 return NULL;
 262         return ibss_rsn->psk;
 263 }
 264
 265
 266 static int auth_send_eapol(void *ctx, const u8 *addr, const u8 *data,
 267                            size_t data_len, int encrypt)
 268 {
 269         struct ibss_rsn *ibss_rsn = ctx;
 270         struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
 271
 272         wpa_printf(MSG_DEBUG, "AUTH: %s(addr=" MACSTR " data_len=%lu "
 273                    "encrypt=%d)",
 274                    __func__, MAC2STR(addr), (unsigned long) data_len, encrypt);
 275
 276         if (wpa_s->l2)
 277                 return l2_packet_send(wpa_s->l2, addr, ETH_P_EAPOL, data,
 278                                       data_len);
 279
 280         return wpa_drv_send_eapol(wpa_s, addr, ETH_P_EAPOL, data, data_len);
 281 }
 282
 283
 284 static int auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
 285                         const u8 *addr, int idx, u8 *key, size_t key_len)
 286 {
 287         struct ibss_rsn *ibss_rsn = ctx;
 288         u8 seq[6];
 289
 290         os_memset(seq, 0, sizeof(seq));
 291
 292         if (addr) {
 293                 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d addr=" MACSTR
 294                            " key_idx=%d)",
 295                            __func__, alg, MAC2STR(addr), idx);
 296         } else {
 297                 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d key_idx=%d)",
 298                            __func__, alg, idx);
 299         }
 300         wpa_hexdump_key(MSG_DEBUG, "AUTH: set_key - key", key, key_len);
 301
 302         if (idx == 0) {
 303                 if (addr) {
 304                         struct ibss_rsn_peer *peer;
 305                         peer = ibss_rsn_get_peer(ibss_rsn, addr);
 306                         if (peer) {
 307                                 peer->authentication_status |=
 308                                         IBSS_RSN_SET_PTK_AUTH;
 309                                 ibss_check_rsn_completed(peer);
 310                         }
 311                 }
 312                 /*
 313                  * In IBSS RSN, the pairwise key from the 4-way handshake
 314                  * initiated by the peer with highest MAC address is used.
 315                  */
 316                 if (addr == NULL ||
 317                     os_memcmp(ibss_rsn->wpa_s->own_addr, addr, ETH_ALEN) < 0) {
 318                         wpa_printf(MSG_DEBUG, "AUTH: Do not use this PTK");
 319                         return 0;
 320                 }
 321         }
 322
 323         return wpa_drv_set_key(ibss_rsn->wpa_s, alg, addr, idx,
 324                                1, seq, 6, key, key_len);
 325 }
 326
 327
 328 static void ibss_rsn_disconnect(void *ctx, const u8 *addr, u16 reason)
 329 {
 330         struct ibss_rsn *ibss_rsn = ctx;
 331         wpa_drv_sta_deauth(ibss_rsn->wpa_s, addr, reason);
 332 }
 333
 334
 335 static int auth_for_each_sta(void *ctx, int (*cb)(struct wpa_state_machine *sm,
 336                                                   void *ctx),
 337                              void *cb_ctx)
 338 {
 339         struct ibss_rsn *ibss_rsn = ctx;
 340         struct ibss_rsn_peer *peer;
 341
 342         wpa_printf(MSG_DEBUG, "AUTH: for_each_sta");
 343
 344         for (peer = ibss_rsn->peers; peer; peer = peer->next) {
 345                 if (peer->auth && cb(peer->auth, cb_ctx))
 346                         return 1;
 347         }
 348
 349         return 0;
 350 }
 351
 352
 353 static void ibss_set_sta_authorized(struct ibss_rsn *ibss_rsn,
 354                                     struct ibss_rsn_peer *peer, int authorized)
 355 {
 356         int res;
 357
 358         if (authorized) {
 359                 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
 360                                             WPA_STA_AUTHORIZED,
 361                                             WPA_STA_AUTHORIZED, ~0);
 362                 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " authorizing port",
 363                            MAC2STR(peer->addr));
 364         } else {
 365                 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
 366                                             0, 0, ~WPA_STA_AUTHORIZED);
 367                 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " unauthorizing port",
 368                            MAC2STR(peer->addr));
 369         }
 370
 371         if (res && errno != ENOENT) {
 372                 wpa_printf(MSG_DEBUG, "Could not set station " MACSTR " flags "
 373                            "for kernel driver (errno=%d)",
 374                            MAC2STR(peer->addr), errno);
 375         }
 376 }
 377
 378
 379 static void auth_set_eapol(void *ctx, const u8 *addr,
 380                                        wpa_eapol_variable var, int value)
 381 {
 382         struct ibss_rsn *ibss_rsn = ctx;
 383         struct ibss_rsn_peer *peer = ibss_rsn_get_peer(ibss_rsn, addr);
 384
 385         if (peer == NULL)
 386                 return;
 387
 388         switch (var) {
 389         case WPA_EAPOL_authorized:
 390                 ibss_set_sta_authorized(ibss_rsn, peer, value);
 391                 break;
 392         default:
 393                 /* do not handle any other event */
 394                 wpa_printf(MSG_DEBUG, "AUTH: eapol event not handled %d", var);
 395                 break;
 396         }
 397 }
 398
 399
 400 static int ibss_rsn_auth_init_group(struct ibss_rsn *ibss_rsn,
 401                                     const u8 *own_addr)
 402 {
 403         struct wpa_auth_config conf;
 404         struct wpa_auth_callbacks cb;
 405
 406         wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
 407
 408         os_memset(&conf, 0, sizeof(conf));
 409         conf.wpa = 2;
 410         conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;
 411         conf.wpa_pairwise = WPA_CIPHER_CCMP;
 412         conf.rsn_pairwise = WPA_CIPHER_CCMP;
 413         conf.wpa_group = WPA_CIPHER_CCMP;
 414         conf.eapol_version = 2;
 415         conf.wpa_group_rekey = 600;
 416
 417         os_memset(&cb, 0, sizeof(cb));
 418         cb.ctx = ibss_rsn;
 419         cb.logger = auth_logger;
 420         cb.set_eapol = auth_set_eapol;
 421         cb.send_eapol = auth_send_eapol;
 422         cb.get_psk = auth_get_psk;
 423         cb.set_key = auth_set_key;
 424         cb.for_each_sta = auth_for_each_sta;
 425         cb.disconnect = ibss_rsn_disconnect;
 426
 427         ibss_rsn->auth_group = wpa_init(own_addr, &conf, &cb);
 428         if (ibss_rsn->auth_group == NULL) {
 429                 wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
 430                 return -1;
 431         }
 432
 433         wpa_init_keys(ibss_rsn->auth_group);
 434
 435         return 0;
 436 }
 437
 438
 439 static int ibss_rsn_auth_init(struct ibss_rsn *ibss_rsn,
 440                               struct ibss_rsn_peer *peer)
 441 {
 442         peer->auth = wpa_auth_sta_init(ibss_rsn->auth_group, peer->addr);
 443         if (peer->auth == NULL) {
 444                 wpa_printf(MSG_DEBUG, "AUTH: wpa_auth_sta_init() failed");
 445                 return -1;
 446         }
 447
 448         /* TODO: get peer RSN IE with Probe Request */
 449         if (wpa_validate_wpa_ie(ibss_rsn->auth_group, peer->auth,
 450                                 (u8 *) "\x30\x14\x01\x00"
 451                                 "\x00\x0f\xac\x04"
 452                                 "\x01\x00\x00\x0f\xac\x04"
 453                                 "\x01\x00\x00\x0f\xac\x02"
 454                                 "\x00\x00", 22, NULL, 0) !=
 455             WPA_IE_OK) {
 456                 wpa_printf(MSG_DEBUG, "AUTH: wpa_validate_wpa_ie() failed");
 457                 return -1;
 458         }
 459
 460         if (wpa_auth_sm_event(peer->auth, WPA_ASSOC))
 461                 return -1;
 462
 463         if (wpa_auth_sta_associated(ibss_rsn->auth_group, peer->auth))
 464                 return -1;
 465
 466         return 0;
 467 }
 468
 469
 470 static int ibss_rsn_send_auth(struct ibss_rsn *ibss_rsn, const u8 *da, int seq)
 471 {
 472         struct ieee80211_mgmt auth;
 473         const size_t auth_length = IEEE80211_HDRLEN + sizeof(auth.u.auth);
 474         struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
 475
 476         if (wpa_s->driver->send_frame == NULL)
 477                 return -1;
 478
 479         os_memset(&auth, 0, sizeof(auth));
 480
 481         auth.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 482                                           WLAN_FC_STYPE_AUTH);
 483         os_memcpy(auth.da, da, ETH_ALEN);
 484         os_memcpy(auth.sa, wpa_s->own_addr, ETH_ALEN);
 485         os_memcpy(auth.bssid, wpa_s->bssid, ETH_ALEN);
 486
 487         auth.u.auth.auth_alg = host_to_le16(WLAN_AUTH_OPEN);
 488         auth.u.auth.auth_transaction = host_to_le16(seq);
 489         auth.u.auth.status_code = host_to_le16(WLAN_STATUS_SUCCESS);
 490
 491         wpa_printf(MSG_DEBUG, "RSN: IBSS TX Auth frame (SEQ %d) to " MACSTR,
 492                    seq, MAC2STR(da));
 493
 494         return wpa_s->driver->send_frame(wpa_s->drv_priv, (u8 *) &auth,
 495                                          auth_length, 0);
 496 }
 497
 498
 499 static int ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)
 500 {
 501         return peer->authentication_status &
 502                (IBSS_RSN_AUTH_BY_US | IBSS_RSN_AUTH_EAPOL_BY_US);
 503 }
 504
 505
 506 static struct ibss_rsn_peer *
 507 ibss_rsn_peer_init(struct ibss_rsn *ibss_rsn, const u8 *addr)
 508 {
 509         struct ibss_rsn_peer *peer;
 510         if (ibss_rsn == NULL)
 511                 return NULL;
 512
 513         peer = ibss_rsn_get_peer(ibss_rsn, addr);
 514         if (peer) {
 515                 wpa_printf(MSG_DEBUG, "RSN: IBSS Supplicant for peer "MACSTR
 516                            " already running", MAC2STR(addr));
 517                 return peer;
 518         }
 519
 520         wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Supplicant for peer "MACSTR,
 521                    MAC2STR(addr));
 522
 523         peer = os_zalloc(sizeof(*peer));
 524         if (peer == NULL) {
 525                 wpa_printf(MSG_DEBUG, "RSN: Could not allocate memory.");
 526                 return NULL;
 527         }
 528
 529         peer->ibss_rsn = ibss_rsn;
 530         os_memcpy(peer->addr, addr, ETH_ALEN);
 531         peer->authentication_status = IBSS_RSN_AUTH_NOT_AUTHENTICATED;
 532
 533         if (ibss_rsn_supp_init(peer, ibss_rsn->wpa_s->own_addr,
 534                                ibss_rsn->psk) < 0) {
 535                 ibss_rsn_free(peer);
 536                 return NULL;
 537         }
 538
 539         peer->next = ibss_rsn->peers;
 540         ibss_rsn->peers = peer;
 541
 542         return peer;
 543 }
 544
 545
 546 int ibss_rsn_start(struct ibss_rsn *ibss_rsn, const u8 *addr)
 547 {
 548         struct ibss_rsn_peer *peer;
 549         int res;
 550
 551         /* if the peer already exists, exit immediately */
 552         peer = ibss_rsn_get_peer(ibss_rsn, addr);
 553         if (peer)
 554                 return 0;
 555
 556         peer = ibss_rsn_peer_init(ibss_rsn, addr);
 557         if (peer == NULL)
 558                 return -1;
 559
 560         /* Open Authentication: send first Authentication frame */
 561         res = ibss_rsn_send_auth(ibss_rsn, addr, 1);
 562         if (res) {
 563                 /*
 564                  * The driver may not support Authentication frame exchange in
 565                  * IBSS. Ignore authentication and go through EAPOL exchange.
 566                  */
 567                 peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
 568                 return ibss_rsn_auth_init(ibss_rsn, peer);
 569         }
 570
 571         return 0;
 572 }
 573
 574
 575 static int ibss_rsn_peer_authenticated(struct ibss_rsn *ibss_rsn,
 576                                        struct ibss_rsn_peer *peer, int reason)
 577 {
 578         int already_started;
 579
 580         if (ibss_rsn == NULL || peer == NULL)
 581                 return -1;
 582
 583         already_started = ibss_rsn_is_auth_started(peer);
 584         peer->authentication_status |= reason;
 585
 586         if (already_started) {
 587                 wpa_printf(MSG_DEBUG, "RSN: IBSS Authenticator already "
 588                            "started for peer " MACSTR, MAC2STR(peer->addr));
 589                 return 0;
 590         }
 591
 592         wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Authenticator "
 593                    "for now-authenticated peer " MACSTR, MAC2STR(peer->addr));
 594
 595         return ibss_rsn_auth_init(ibss_rsn, peer);
 596 }
 597
 598
 599 void ibss_rsn_stop(struct ibss_rsn *ibss_rsn, const u8 *peermac)
 600 {
 601         struct ibss_rsn_peer *peer, *prev;
 602
 603         if (ibss_rsn == NULL)
 604                 return;
 605
 606         if (peermac == NULL) {
 607                 /* remove all peers */
 608                 wpa_printf(MSG_DEBUG, "%s: Remove all peers", __func__);
 609                 peer = ibss_rsn->peers;
 610                 while (peer) {
 611                         prev = peer;
 612                         peer = peer->next;
 613                         ibss_rsn_free(prev);
 614                         ibss_rsn->peers = peer;
 615                 }
 616         } else {
 617                 /* remove specific peer */
 618                 wpa_printf(MSG_DEBUG, "%s: Remove specific peer " MACSTR,
 619                            __func__, MAC2STR(peermac));
 620
 621                 for (prev = NULL, peer = ibss_rsn->peers; peer != NULL;
 622                      prev = peer, peer = peer->next) {
 623                         if (os_memcmp(peermac, peer->addr, ETH_ALEN) == 0) {
 624                                 if (prev == NULL)
 625                                         ibss_rsn->peers = peer->next;
 626                                 else
 627                                         prev->next = peer->next;
 628                                 ibss_rsn_free(peer);
 629                                 wpa_printf(MSG_DEBUG, "%s: Successfully "
 630                                            "removed a specific peer",
 631                                            __func__);
 632                                 break;
 633                         }
 634                 }
 635         }
 636 }
 637
 638
 639 struct ibss_rsn * ibss_rsn_init(struct wpa_supplicant *wpa_s)
 640 {
 641         struct ibss_rsn *ibss_rsn;
 642
 643         ibss_rsn = os_zalloc(sizeof(*ibss_rsn));
 644         if (ibss_rsn == NULL)
 645                 return NULL;
 646         ibss_rsn->wpa_s = wpa_s;
 647
 648         if (ibss_rsn_auth_init_group(ibss_rsn, wpa_s->own_addr) < 0) {
 649                 ibss_rsn_deinit(ibss_rsn);
 650                 return NULL;
 651         }
 652
 653         return ibss_rsn;
 654 }
 655
 656
 657 void ibss_rsn_deinit(struct ibss_rsn *ibss_rsn)
 658 {
 659         struct ibss_rsn_peer *peer, *prev;
 660
 661         if (ibss_rsn == NULL)
 662                 return;
 663
 664         peer = ibss_rsn->peers;
 665         while (peer) {
 666                 prev = peer;
 667                 peer = peer->next;
 668                 ibss_rsn_free(prev);
 669         }
 670
 671         wpa_deinit(ibss_rsn->auth_group);
 672         os_free(ibss_rsn);
 673
 674 }
 675
 676
 677 static int ibss_rsn_eapol_dst_supp(const u8 *buf, size_t len)
 678 {
 679         const struct ieee802_1x_hdr *hdr;
 680         const struct wpa_eapol_key *key;
 681         u16 key_info;
 682         size_t plen;
 683
 684         /* TODO: Support other EAPOL packets than just EAPOL-Key */
 685
 686         if (len < sizeof(*hdr) + sizeof(*key))
 687                 return -1;
 688
 689         hdr = (const struct ieee802_1x_hdr *) buf;
 690         key = (const struct wpa_eapol_key *) (hdr + 1);
 691         plen = be_to_host16(hdr->length);
 692
 693         if (hdr->version < EAPOL_VERSION) {
 694                 /* TODO: backwards compatibility */
 695         }
 696         if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
 697                 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame (type %u) discarded, "
 698                         "not a Key frame", hdr->type);
 699                 return -1;
 700         }
 701         if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
 702                 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame payload size %lu "
 703                            "invalid (frame size %lu)",
 704                            (unsigned long) plen, (unsigned long) len);
 705                 return -1;
 706         }
 707
 708         if (key->type != EAPOL_KEY_TYPE_RSN) {
 709                 wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key type (%d) unknown, "
 710                            "discarded", key->type);
 711                 return -1;
 712         }
 713
 714         key_info = WPA_GET_BE16(key->key_info);
 715
 716         return !!(key_info & WPA_KEY_INFO_ACK);
 717 }
 718
 719
 720 static int ibss_rsn_process_rx_eapol(struct ibss_rsn *ibss_rsn,
 721                                      struct ibss_rsn_peer *peer,
 722                                      const u8 *buf, size_t len)
 723 {
 724         int supp;
 725         u8 *tmp;
 726
 727         supp = ibss_rsn_eapol_dst_supp(buf, len);
 728         if (supp < 0)
 729                 return -1;
 730
 731         tmp = os_malloc(len);
 732         if (tmp == NULL)
 733                 return -1;
 734         os_memcpy(tmp, buf, len);
 735         if (supp) {
 736                 peer->authentication_status |= IBSS_RSN_AUTH_EAPOL_BY_PEER;
 737                 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Supplicant from "
 738                            MACSTR, MAC2STR(peer->addr));
 739                 wpa_sm_rx_eapol(peer->supp, peer->addr, tmp, len);
 740         } else {
 741                 if (ibss_rsn_is_auth_started(peer) == 0) {
 742                         wpa_printf(MSG_DEBUG, "RSN: IBSS EAPOL for "
 743                                    "Authenticator dropped as " MACSTR " is not "
 744                                    "authenticated", MAC2STR(peer->addr));
 745                         os_free(tmp);
 746                         return -1;
 747                 }
 748
 749                 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Authenticator "
 750                            "from "MACSTR, MAC2STR(peer->addr));
 751                 wpa_receive(ibss_rsn->auth_group, peer->auth, tmp, len);
 752         }
 753         os_free(tmp);
 754
 755         return 1;
 756 }
 757
 758
 759 int ibss_rsn_rx_eapol(struct ibss_rsn *ibss_rsn, const u8 *src_addr,
 760                       const u8 *buf, size_t len)
 761 {
 762         struct ibss_rsn_peer *peer;
 763
 764         if (ibss_rsn == NULL)
 765                 return -1;
 766
 767         peer = ibss_rsn_get_peer(ibss_rsn, src_addr);
 768         if (peer)
 769                 return ibss_rsn_process_rx_eapol(ibss_rsn, peer, buf, len);
 770
 771         if (ibss_rsn_eapol_dst_supp(buf, len) > 0) {
 772                 /*
 773                  * Create new IBSS peer based on an EAPOL message from the peer
 774                  * Authenticator.
 775                  */
 776                 peer = ibss_rsn_peer_init(ibss_rsn, src_addr);
 777                 if (peer == NULL)
 778                         return -1;
 779
 780                 /* assume the peer is authenticated already */
 781                 wpa_printf(MSG_DEBUG, "RSN: IBSS Not using IBSS Auth for peer "
 782                            MACSTR, MAC2STR(src_addr));
 783                 ibss_rsn_peer_authenticated(ibss_rsn, peer,
 784                                             IBSS_RSN_AUTH_EAPOL_BY_US);
 785
 786                 return ibss_rsn_process_rx_eapol(ibss_rsn, ibss_rsn->peers,
 787                                                  buf, len);
 788         }
 789
 790         return 0;
 791 }
 792
 793 void ibss_rsn_set_psk(struct ibss_rsn *ibss_rsn, const u8 *psk)
 794 {
 795         if (ibss_rsn == NULL)
 796                 return;
 797         os_memcpy(ibss_rsn->psk, psk, PMK_LEN);
 798 }
 799
 800
 801 static void ibss_rsn_handle_auth_1_of_2(struct ibss_rsn *ibss_rsn,
 802                                         struct ibss_rsn_peer *peer,
 803                                         const u8* addr)
 804 {
 805         wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 1) from " MACSTR,
 806                    MAC2STR(addr));
 807
 808         if (peer &&
 809             peer->authentication_status & IBSS_RSN_AUTH_EAPOL_BY_PEER) {
 810                 /*
 811                  * A peer sent us an Authentication frame even though it already
 812                  * started an EAPOL session. We should reinit state machines
 813                  * here, but it's much more complicated than just deleting and
 814                  * recreating the state machine
 815                  */
 816                 wpa_printf(MSG_DEBUG, "RSN: IBSS Reinitializing station "
 817                            MACSTR, MAC2STR(addr));
 818
 819                 ibss_rsn_stop(ibss_rsn, addr);
 820                 peer = NULL;
 821         }
 822
 823         if (!peer) {
 824                 peer = ibss_rsn_peer_init(ibss_rsn, addr);
 825                 if (!peer)
 826                         return;
 827
 828                 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth started by peer " MACSTR,
 829                            MAC2STR(addr));
 830         }
 831
 832         /* reply with an Authentication frame now, before sending an EAPOL */
 833         ibss_rsn_send_auth(ibss_rsn, addr, 2);
 834         /* no need to start another AUTH challenge in the other way.. */
 835         ibss_rsn_peer_authenticated(ibss_rsn, peer, IBSS_RSN_AUTH_EAPOL_BY_US);
 836 }
 837
 838
 839 void ibss_rsn_handle_auth(struct ibss_rsn *ibss_rsn, const u8 *auth_frame,
 840                           size_t len)
 841 {
 842         const struct ieee80211_mgmt *header;
 843         struct ibss_rsn_peer *peer;
 844         size_t auth_length;
 845
 846         header = (const struct ieee80211_mgmt *) auth_frame;
 847         auth_length = IEEE80211_HDRLEN + sizeof(header->u.auth);
 848
 849         if (ibss_rsn == NULL || len < auth_length)
 850                 return;
 851
 852         if (le_to_host16(header->u.auth.auth_alg) != WLAN_AUTH_OPEN ||
 853             le_to_host16(header->u.auth.status_code) != WLAN_STATUS_SUCCESS)
 854                 return;
 855
 856         peer = ibss_rsn_get_peer(ibss_rsn, header->sa);
 857
 858         switch (le_to_host16(header->u.auth.auth_transaction)) {
 859         case 1:
 860                 ibss_rsn_handle_auth_1_of_2(ibss_rsn, peer, header->sa);
 861                 break;
 862         case 2:
 863                 wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 2) from "
 864                            MACSTR, MAC2STR(header->sa));
 865                 if (!peer) {
 866                         wpa_printf(MSG_DEBUG, "RSN: Received Auth seq 2 from "
 867                                    "unknown STA " MACSTR, MAC2STR(header->sa));
 868                         break;
 869                 }
 870
 871                 /* authentication has been completed */
 872                 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth completed with "MACSTR,
 873                            MAC2STR(header->sa));
 874                 ibss_rsn_peer_authenticated(ibss_rsn, peer,
 875                                             IBSS_RSN_AUTH_BY_US);
 876                 break;
 877         }
 878 }