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 "utils/eloop.h"
  14 #include "l2_packet/l2_packet.h"
  15 #include "rsn_supp/wpa.h"
  16 #include "rsn_supp/wpa_ie.h"
  17 #include "ap/wpa_auth.h"
  18 #include "wpa_supplicant_i.h"
  19 #include "driver_i.h"
  20 #include "common/ieee802_11_defs.h"
  21 #include "ibss_rsn.h"
  22
  23
  24 static void ibss_rsn_auth_timeout(void *eloop_ctx, void *timeout_ctx);
  25
  26
  27 static struct ibss_rsn_peer * ibss_rsn_get_peer(struct ibss_rsn *ibss_rsn,
  28                                                 const u8 *addr)
  29 {
  30         struct ibss_rsn_peer *peer;
  31
  32         for (peer = ibss_rsn->peers; peer; peer = peer->next)
  33                 if (os_memcmp(addr, peer->addr, ETH_ALEN) == 0)
  34                         break;
  35         return peer;
  36 }
  37
  38
  39 static void ibss_rsn_free(struct ibss_rsn_peer *peer)
  40 {
  41         eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL);
  42         wpa_auth_sta_deinit(peer->auth);
  43         wpa_sm_deinit(peer->supp);
  44         os_free(peer);
  45 }
  46
  47
  48 static void supp_set_state(void *ctx, enum wpa_states state)
  49 {
  50         struct ibss_rsn_peer *peer = ctx;
  51         peer->supp_state = state;
  52 }
  53
  54
  55 static enum wpa_states supp_get_state(void *ctx)
  56 {
  57         struct ibss_rsn_peer *peer = ctx;
  58         return peer->supp_state;
  59 }
  60
  61
  62 static int supp_ether_send(void *ctx, const u8 *dest, u16 proto, const u8 *buf,
  63                            size_t len)
  64 {
  65         struct ibss_rsn_peer *peer = ctx;
  66         struct wpa_supplicant *wpa_s = peer->ibss_rsn->wpa_s;
  67
  68         wpa_printf(MSG_DEBUG, "SUPP: %s(dest=" MACSTR " proto=0x%04x "
  69                    "len=%lu)",
  70                    __func__, MAC2STR(dest), proto, (unsigned long) len);
  71
  72         if (wpa_s->l2)
  73                 return l2_packet_send(wpa_s->l2, dest, proto, buf, len);
  74
  75         return wpa_drv_send_eapol(wpa_s, dest, proto, buf, len);
  76 }
  77
  78
  79 static u8 * supp_alloc_eapol(void *ctx, u8 type, const void *data,
  80                              u16 data_len, size_t *msg_len, void **data_pos)
  81 {
  82         struct ieee802_1x_hdr *hdr;
  83
  84         wpa_printf(MSG_DEBUG, "SUPP: %s(type=%d data_len=%d)",
  85                    __func__, type, data_len);
  86
  87         *msg_len = sizeof(*hdr) + data_len;
  88         hdr = os_malloc(*msg_len);
  89         if (hdr == NULL)
  90                 return NULL;
  91
  92         hdr->version = 2;
  93         hdr->type = type;
  94         hdr->length = host_to_be16(data_len);
  95
  96         if (data)
  97                 os_memcpy(hdr + 1, data, data_len);
  98         else
  99                 os_memset(hdr + 1, 0, data_len);
 100
 101         if (data_pos)
 102                 *data_pos = hdr + 1;
 103
 104         return (u8 *) hdr;
 105 }
 106
 107
 108 static int supp_get_beacon_ie(void *ctx)
 109 {
 110         struct ibss_rsn_peer *peer = ctx;
 111
 112         wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
 113         /* TODO: get correct RSN IE */
 114         return wpa_sm_set_ap_rsn_ie(peer->supp,
 115                                     (u8 *) "\x30\x14\x01\x00"
 116                                     "\x00\x0f\xac\x04"
 117                                     "\x01\x00\x00\x0f\xac\x04"
 118                                     "\x01\x00\x00\x0f\xac\x02"
 119                                     "\x00\x00", 22);
 120 }
 121
 122
 123 static void ibss_check_rsn_completed(struct ibss_rsn_peer *peer)
 124 {
 125         struct wpa_supplicant *wpa_s = peer->ibss_rsn->wpa_s;
 126
 127         if ((peer->authentication_status &
 128              (IBSS_RSN_SET_PTK_SUPP | IBSS_RSN_SET_PTK_AUTH)) !=
 129             (IBSS_RSN_SET_PTK_SUPP | IBSS_RSN_SET_PTK_AUTH))
 130                 return;
 131         if (peer->authentication_status & IBSS_RSN_REPORTED_PTK)
 132                 return;
 133         peer->authentication_status |= IBSS_RSN_REPORTED_PTK;
 134         wpa_msg(wpa_s, MSG_INFO, IBSS_RSN_COMPLETED MACSTR,
 135                 MAC2STR(peer->addr));
 136 }
 137
 138
 139 static int supp_set_key(void *ctx, enum wpa_alg alg,
 140                         const u8 *addr, int key_idx, int set_tx,
 141                         const u8 *seq, size_t seq_len,
 142                         const u8 *key, size_t key_len)
 143 {
 144         struct ibss_rsn_peer *peer = ctx;
 145
 146         wpa_printf(MSG_DEBUG, "SUPP: %s(alg=%d addr=" MACSTR " key_idx=%d "
 147                    "set_tx=%d)",
 148                    __func__, alg, MAC2STR(addr), key_idx, set_tx);
 149         wpa_hexdump(MSG_DEBUG, "SUPP: set_key - seq", seq, seq_len);
 150         wpa_hexdump_key(MSG_DEBUG, "SUPP: set_key - key", key, key_len);
 151
 152         if (key_idx == 0) {
 153                 peer->authentication_status |= IBSS_RSN_SET_PTK_SUPP;
 154                 ibss_check_rsn_completed(peer);
 155                 /*
 156                  * In IBSS RSN, the pairwise key from the 4-way handshake
 157                  * initiated by the peer with highest MAC address is used.
 158                  */
 159                 if (os_memcmp(peer->ibss_rsn->wpa_s->own_addr, peer->addr,
 160                               ETH_ALEN) > 0) {
 161                         wpa_printf(MSG_DEBUG, "SUPP: Do not use this PTK");
 162                         return 0;
 163                 }
 164         }
 165
 166         if (is_broadcast_ether_addr(addr))
 167                 addr = peer->addr;
 168         return wpa_drv_set_key(peer->ibss_rsn->wpa_s, alg, addr, key_idx,
 169                                set_tx, seq, seq_len, key, key_len);
 170 }
 171
 172
 173 static void * supp_get_network_ctx(void *ctx)
 174 {
 175         struct ibss_rsn_peer *peer = ctx;
 176         return wpa_supplicant_get_ssid(peer->ibss_rsn->wpa_s);
 177 }
 178
 179
 180 static int supp_mlme_setprotection(void *ctx, const u8 *addr,
 181                                    int protection_type, int key_type)
 182 {
 183         wpa_printf(MSG_DEBUG, "SUPP: %s(addr=" MACSTR " protection_type=%d "
 184                    "key_type=%d)",
 185                    __func__, MAC2STR(addr), protection_type, key_type);
 186         return 0;
 187 }
 188
 189
 190 static void supp_cancel_auth_timeout(void *ctx)
 191 {
 192         wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
 193 }
 194
 195
 196 static void supp_deauthenticate(void * ctx, int reason_code)
 197 {
 198         wpa_printf(MSG_DEBUG, "SUPP: %s (TODO)", __func__);
 199 }
 200
 201
 202 static int ibss_rsn_supp_init(struct ibss_rsn_peer *peer, const u8 *own_addr,
 203                               const u8 *psk)
 204 {
 205         struct wpa_sm_ctx *ctx = os_zalloc(sizeof(*ctx));
 206         if (ctx == NULL)
 207                 return -1;
 208
 209         ctx->ctx = peer;
 210         ctx->msg_ctx = peer->ibss_rsn->wpa_s;
 211         ctx->set_state = supp_set_state;
 212         ctx->get_state = supp_get_state;
 213         ctx->ether_send = supp_ether_send;
 214         ctx->get_beacon_ie = supp_get_beacon_ie;
 215         ctx->alloc_eapol = supp_alloc_eapol;
 216         ctx->set_key = supp_set_key;
 217         ctx->get_network_ctx = supp_get_network_ctx;
 218         ctx->mlme_setprotection = supp_mlme_setprotection;
 219         ctx->cancel_auth_timeout = supp_cancel_auth_timeout;
 220         ctx->deauthenticate = supp_deauthenticate;
 221         peer->supp = wpa_sm_init(ctx);
 222         if (peer->supp == NULL) {
 223                 wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_init() failed");
 224                 return -1;
 225         }
 226
 227         wpa_sm_set_own_addr(peer->supp, own_addr);
 228         wpa_sm_set_param(peer->supp, WPA_PARAM_RSN_ENABLED, 1);
 229         wpa_sm_set_param(peer->supp, WPA_PARAM_PROTO, WPA_PROTO_RSN);
 230         wpa_sm_set_param(peer->supp, WPA_PARAM_PAIRWISE, WPA_CIPHER_CCMP);
 231         wpa_sm_set_param(peer->supp, WPA_PARAM_GROUP, WPA_CIPHER_CCMP);
 232         wpa_sm_set_param(peer->supp, WPA_PARAM_KEY_MGMT, WPA_KEY_MGMT_PSK);
 233         wpa_sm_set_pmk(peer->supp, psk, PMK_LEN);
 234
 235         peer->supp_ie_len = sizeof(peer->supp_ie);
 236         if (wpa_sm_set_assoc_wpa_ie_default(peer->supp, peer->supp_ie,
 237                                             &peer->supp_ie_len) < 0) {
 238                 wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_set_assoc_wpa_ie_default()"
 239                            " failed");
 240                 return -1;
 241         }
 242
 243         wpa_sm_notify_assoc(peer->supp, peer->addr);
 244
 245         return 0;
 246 }
 247
 248
 249 static void auth_logger(void *ctx, const u8 *addr, logger_level level,
 250                         const char *txt)
 251 {
 252         if (addr)
 253                 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " - %s",
 254                            MAC2STR(addr), txt);
 255         else
 256                 wpa_printf(MSG_DEBUG, "AUTH: %s", txt);
 257 }
 258
 259
 260 static const u8 * auth_get_psk(void *ctx, const u8 *addr, const u8 *prev_psk)
 261 {
 262         struct ibss_rsn *ibss_rsn = ctx;
 263         wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",
 264                    __func__, MAC2STR(addr), prev_psk);
 265         if (prev_psk)
 266                 return NULL;
 267         return ibss_rsn->psk;
 268 }
 269
 270
 271 static int auth_send_eapol(void *ctx, const u8 *addr, const u8 *data,
 272                            size_t data_len, int encrypt)
 273 {
 274         struct ibss_rsn *ibss_rsn = ctx;
 275         struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
 276
 277         wpa_printf(MSG_DEBUG, "AUTH: %s(addr=" MACSTR " data_len=%lu "
 278                    "encrypt=%d)",
 279                    __func__, MAC2STR(addr), (unsigned long) data_len, encrypt);
 280
 281         if (wpa_s->l2)
 282                 return l2_packet_send(wpa_s->l2, addr, ETH_P_EAPOL, data,
 283                                       data_len);
 284
 285         return wpa_drv_send_eapol(wpa_s, addr, ETH_P_EAPOL, data, data_len);
 286 }
 287
 288
 289 static int auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
 290                         const u8 *addr, int idx, u8 *key, size_t key_len)
 291 {
 292         struct ibss_rsn *ibss_rsn = ctx;
 293         u8 seq[6];
 294
 295         os_memset(seq, 0, sizeof(seq));
 296
 297         if (addr) {
 298                 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d addr=" MACSTR
 299                            " key_idx=%d)",
 300                            __func__, alg, MAC2STR(addr), idx);
 301         } else {
 302                 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d key_idx=%d)",
 303                            __func__, alg, idx);
 304         }
 305         wpa_hexdump_key(MSG_DEBUG, "AUTH: set_key - key", key, key_len);
 306
 307         if (idx == 0) {
 308                 if (addr) {
 309                         struct ibss_rsn_peer *peer;
 310                         peer = ibss_rsn_get_peer(ibss_rsn, addr);
 311                         if (peer) {
 312                                 peer->authentication_status |=
 313                                         IBSS_RSN_SET_PTK_AUTH;
 314                                 ibss_check_rsn_completed(peer);
 315                         }
 316                 }
 317                 /*
 318                  * In IBSS RSN, the pairwise key from the 4-way handshake
 319                  * initiated by the peer with highest MAC address is used.
 320                  */
 321                 if (addr == NULL ||
 322                     os_memcmp(ibss_rsn->wpa_s->own_addr, addr, ETH_ALEN) < 0) {
 323                         wpa_printf(MSG_DEBUG, "AUTH: Do not use this PTK");
 324                         return 0;
 325                 }
 326         }
 327
 328         return wpa_drv_set_key(ibss_rsn->wpa_s, alg, addr, idx,
 329                                1, seq, 6, key, key_len);
 330 }
 331
 332
 333 static void ibss_rsn_disconnect(void *ctx, const u8 *addr, u16 reason)
 334 {
 335         struct ibss_rsn *ibss_rsn = ctx;
 336         wpa_drv_sta_deauth(ibss_rsn->wpa_s, addr, reason);
 337 }
 338
 339
 340 static int auth_for_each_sta(void *ctx, int (*cb)(struct wpa_state_machine *sm,
 341                                                   void *ctx),
 342                              void *cb_ctx)
 343 {
 344         struct ibss_rsn *ibss_rsn = ctx;
 345         struct ibss_rsn_peer *peer;
 346
 347         wpa_printf(MSG_DEBUG, "AUTH: for_each_sta");
 348
 349         for (peer = ibss_rsn->peers; peer; peer = peer->next) {
 350                 if (peer->auth && cb(peer->auth, cb_ctx))
 351                         return 1;
 352         }
 353
 354         return 0;
 355 }
 356
 357
 358 static void ibss_set_sta_authorized(struct ibss_rsn *ibss_rsn,
 359                                     struct ibss_rsn_peer *peer, int authorized)
 360 {
 361         int res;
 362
 363         if (authorized) {
 364                 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
 365                                             WPA_STA_AUTHORIZED,
 366                                             WPA_STA_AUTHORIZED, ~0);
 367                 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " authorizing port",
 368                            MAC2STR(peer->addr));
 369         } else {
 370                 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
 371                                             0, 0, ~WPA_STA_AUTHORIZED);
 372                 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " unauthorizing port",
 373                            MAC2STR(peer->addr));
 374         }
 375
 376         if (res && errno != ENOENT) {
 377                 wpa_printf(MSG_DEBUG, "Could not set station " MACSTR " flags "
 378                            "for kernel driver (errno=%d)",
 379                            MAC2STR(peer->addr), errno);
 380         }
 381 }
 382
 383
 384 static void auth_set_eapol(void *ctx, const u8 *addr,
 385                                        wpa_eapol_variable var, int value)
 386 {
 387         struct ibss_rsn *ibss_rsn = ctx;
 388         struct ibss_rsn_peer *peer = ibss_rsn_get_peer(ibss_rsn, addr);
 389
 390         if (peer == NULL)
 391                 return;
 392
 393         switch (var) {
 394         case WPA_EAPOL_authorized:
 395                 ibss_set_sta_authorized(ibss_rsn, peer, value);
 396                 break;
 397         default:
 398                 /* do not handle any other event */
 399                 wpa_printf(MSG_DEBUG, "AUTH: eapol event not handled %d", var);
 400                 break;
 401         }
 402 }
 403
 404
 405 static int ibss_rsn_auth_init_group(struct ibss_rsn *ibss_rsn,
 406                                     const u8 *own_addr)
 407 {
 408         struct wpa_auth_config conf;
 409         struct wpa_auth_callbacks cb;
 410
 411         wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
 412
 413         os_memset(&conf, 0, sizeof(conf));
 414         conf.wpa = 2;
 415         conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;
 416         conf.wpa_pairwise = WPA_CIPHER_CCMP;
 417         conf.rsn_pairwise = WPA_CIPHER_CCMP;
 418         conf.wpa_group = WPA_CIPHER_CCMP;
 419         conf.eapol_version = 2;
 420         conf.wpa_group_rekey = 600;
 421
 422         os_memset(&cb, 0, sizeof(cb));
 423         cb.ctx = ibss_rsn;
 424         cb.logger = auth_logger;
 425         cb.set_eapol = auth_set_eapol;
 426         cb.send_eapol = auth_send_eapol;
 427         cb.get_psk = auth_get_psk;
 428         cb.set_key = auth_set_key;
 429         cb.for_each_sta = auth_for_each_sta;
 430         cb.disconnect = ibss_rsn_disconnect;
 431
 432         ibss_rsn->auth_group = wpa_init(own_addr, &conf, &cb);
 433         if (ibss_rsn->auth_group == NULL) {
 434                 wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
 435                 return -1;
 436         }
 437
 438         wpa_init_keys(ibss_rsn->auth_group);
 439
 440         return 0;
 441 }
 442
 443
 444 static int ibss_rsn_auth_init(struct ibss_rsn *ibss_rsn,
 445                               struct ibss_rsn_peer *peer)
 446 {
 447         peer->auth = wpa_auth_sta_init(ibss_rsn->auth_group, peer->addr, NULL);
 448         if (peer->auth == NULL) {
 449                 wpa_printf(MSG_DEBUG, "AUTH: wpa_auth_sta_init() failed");
 450                 return -1;
 451         }
 452
 453         /* TODO: get peer RSN IE with Probe Request */
 454         if (wpa_validate_wpa_ie(ibss_rsn->auth_group, peer->auth,
 455                                 (u8 *) "\x30\x14\x01\x00"
 456                                 "\x00\x0f\xac\x04"
 457                                 "\x01\x00\x00\x0f\xac\x04"
 458                                 "\x01\x00\x00\x0f\xac\x02"
 459                                 "\x00\x00", 22, NULL, 0) !=
 460             WPA_IE_OK) {
 461                 wpa_printf(MSG_DEBUG, "AUTH: wpa_validate_wpa_ie() failed");
 462                 return -1;
 463         }
 464
 465         if (wpa_auth_sm_event(peer->auth, WPA_ASSOC))
 466                 return -1;
 467
 468         if (wpa_auth_sta_associated(ibss_rsn->auth_group, peer->auth))
 469                 return -1;
 470
 471         return 0;
 472 }
 473
 474
 475 static int ibss_rsn_send_auth(struct ibss_rsn *ibss_rsn, const u8 *da, int seq)
 476 {
 477         struct ieee80211_mgmt auth;
 478         const size_t auth_length = IEEE80211_HDRLEN + sizeof(auth.u.auth);
 479         struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
 480
 481         if (wpa_s->driver->send_frame == NULL)
 482                 return -1;
 483
 484         os_memset(&auth, 0, sizeof(auth));
 485
 486         auth.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 487                                           WLAN_FC_STYPE_AUTH);
 488         os_memcpy(auth.da, da, ETH_ALEN);
 489         os_memcpy(auth.sa, wpa_s->own_addr, ETH_ALEN);
 490         os_memcpy(auth.bssid, wpa_s->bssid, ETH_ALEN);
 491
 492         auth.u.auth.auth_alg = host_to_le16(WLAN_AUTH_OPEN);
 493         auth.u.auth.auth_transaction = host_to_le16(seq);
 494         auth.u.auth.status_code = host_to_le16(WLAN_STATUS_SUCCESS);
 495
 496         wpa_printf(MSG_DEBUG, "RSN: IBSS TX Auth frame (SEQ %d) to " MACSTR,
 497                    seq, MAC2STR(da));
 498
 499         return wpa_s->driver->send_frame(wpa_s->drv_priv, (u8 *) &auth,
 500                                          auth_length, 0);
 501 }
 502
 503
 504 static int ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)
 505 {
 506         return peer->authentication_status &
 507                (IBSS_RSN_AUTH_BY_US | IBSS_RSN_AUTH_EAPOL_BY_US);
 508 }
 509
 510
 511 static struct ibss_rsn_peer *
 512 ibss_rsn_peer_init(struct ibss_rsn *ibss_rsn, const u8 *addr)
 513 {
 514         struct ibss_rsn_peer *peer;
 515         if (ibss_rsn == NULL)
 516                 return NULL;
 517
 518         peer = ibss_rsn_get_peer(ibss_rsn, addr);
 519         if (peer) {
 520                 wpa_printf(MSG_DEBUG, "RSN: IBSS Supplicant for peer "MACSTR
 521                            " already running", MAC2STR(addr));
 522                 return peer;
 523         }
 524
 525         wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Supplicant for peer "MACSTR,
 526                    MAC2STR(addr));
 527
 528         peer = os_zalloc(sizeof(*peer));
 529         if (peer == NULL) {
 530                 wpa_printf(MSG_DEBUG, "RSN: Could not allocate memory.");
 531                 return NULL;
 532         }
 533
 534         peer->ibss_rsn = ibss_rsn;
 535         os_memcpy(peer->addr, addr, ETH_ALEN);
 536         peer->authentication_status = IBSS_RSN_AUTH_NOT_AUTHENTICATED;
 537
 538         if (ibss_rsn_supp_init(peer, ibss_rsn->wpa_s->own_addr,
 539                                ibss_rsn->psk) < 0) {
 540                 ibss_rsn_free(peer);
 541                 return NULL;
 542         }
 543
 544         peer->next = ibss_rsn->peers;
 545         ibss_rsn->peers = peer;
 546
 547         return peer;
 548 }
 549
 550
 551 static void ibss_rsn_auth_timeout(void *eloop_ctx, void *timeout_ctx)
 552 {
 553         struct ibss_rsn_peer *peer = eloop_ctx;
 554
 555         /*
 556          * Assume peer does not support Authentication exchange or the frame was
 557          * lost somewhere - start EAPOL Authenticator.
 558          */
 559         wpa_printf(MSG_DEBUG,
 560                    "RSN: Timeout on waiting Authentication frame response from "
 561                    MACSTR " - start authenticator", MAC2STR(peer->addr));
 562
 563         peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
 564         ibss_rsn_auth_init(peer->ibss_rsn, peer);
 565 }
 566
 567
 568 int ibss_rsn_start(struct ibss_rsn *ibss_rsn, const u8 *addr)
 569 {
 570         struct ibss_rsn_peer *peer;
 571         int res;
 572
 573         /* if the peer already exists, exit immediately */
 574         peer = ibss_rsn_get_peer(ibss_rsn, addr);
 575         if (peer)
 576                 return 0;
 577
 578         peer = ibss_rsn_peer_init(ibss_rsn, addr);
 579         if (peer == NULL)
 580                 return -1;
 581
 582         /* Open Authentication: send first Authentication frame */
 583         res = ibss_rsn_send_auth(ibss_rsn, addr, 1);
 584         if (res) {
 585                 /*
 586                  * The driver may not support Authentication frame exchange in
 587                  * IBSS. Ignore authentication and go through EAPOL exchange.
 588                  */
 589                 peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
 590                 return ibss_rsn_auth_init(ibss_rsn, peer);
 591         } else {
 592                 os_get_time(&peer->own_auth_tx);
 593                 eloop_register_timeout(1, 0, ibss_rsn_auth_timeout, peer, NULL);
 594         }
 595
 596         return 0;
 597 }
 598
 599
 600 static int ibss_rsn_peer_authenticated(struct ibss_rsn *ibss_rsn,
 601                                        struct ibss_rsn_peer *peer, int reason)
 602 {
 603         int already_started;
 604
 605         if (ibss_rsn == NULL || peer == NULL)
 606                 return -1;
 607
 608         already_started = ibss_rsn_is_auth_started(peer);
 609         peer->authentication_status |= reason;
 610
 611         if (already_started) {
 612                 wpa_printf(MSG_DEBUG, "RSN: IBSS Authenticator already "
 613                            "started for peer " MACSTR, MAC2STR(peer->addr));
 614                 return 0;
 615         }
 616
 617         wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Authenticator "
 618                    "for now-authenticated peer " MACSTR, MAC2STR(peer->addr));
 619
 620         return ibss_rsn_auth_init(ibss_rsn, peer);
 621 }
 622
 623
 624 void ibss_rsn_stop(struct ibss_rsn *ibss_rsn, const u8 *peermac)
 625 {
 626         struct ibss_rsn_peer *peer, *prev;
 627
 628         if (ibss_rsn == NULL)
 629                 return;
 630
 631         if (peermac == NULL) {
 632                 /* remove all peers */
 633                 wpa_printf(MSG_DEBUG, "%s: Remove all peers", __func__);
 634                 peer = ibss_rsn->peers;
 635                 while (peer) {
 636                         prev = peer;
 637                         peer = peer->next;
 638                         ibss_rsn_free(prev);
 639                         ibss_rsn->peers = peer;
 640                 }
 641         } else {
 642                 /* remove specific peer */
 643                 wpa_printf(MSG_DEBUG, "%s: Remove specific peer " MACSTR,
 644                            __func__, MAC2STR(peermac));
 645
 646                 for (prev = NULL, peer = ibss_rsn->peers; peer != NULL;
 647                      prev = peer, peer = peer->next) {
 648                         if (os_memcmp(peermac, peer->addr, ETH_ALEN) == 0) {
 649                                 if (prev == NULL)
 650                                         ibss_rsn->peers = peer->next;
 651                                 else
 652                                         prev->next = peer->next;
 653                                 ibss_rsn_free(peer);
 654                                 wpa_printf(MSG_DEBUG, "%s: Successfully "
 655                                            "removed a specific peer",
 656                                            __func__);
 657                                 break;
 658                         }
 659                 }
 660         }
 661 }
 662
 663
 664 struct ibss_rsn * ibss_rsn_init(struct wpa_supplicant *wpa_s)
 665 {
 666         struct ibss_rsn *ibss_rsn;
 667
 668         ibss_rsn = os_zalloc(sizeof(*ibss_rsn));
 669         if (ibss_rsn == NULL)
 670                 return NULL;
 671         ibss_rsn->wpa_s = wpa_s;
 672
 673         if (ibss_rsn_auth_init_group(ibss_rsn, wpa_s->own_addr) < 0) {
 674                 ibss_rsn_deinit(ibss_rsn);
 675                 return NULL;
 676         }
 677
 678         return ibss_rsn;
 679 }
 680
 681
 682 void ibss_rsn_deinit(struct ibss_rsn *ibss_rsn)
 683 {
 684         struct ibss_rsn_peer *peer, *prev;
 685
 686         if (ibss_rsn == NULL)
 687                 return;
 688
 689         peer = ibss_rsn->peers;
 690         while (peer) {
 691                 prev = peer;
 692                 peer = peer->next;
 693                 ibss_rsn_free(prev);
 694         }
 695
 696         wpa_deinit(ibss_rsn->auth_group);
 697         os_free(ibss_rsn);
 698
 699 }
 700
 701
 702 static int ibss_rsn_eapol_dst_supp(const u8 *buf, size_t len)
 703 {
 704         const struct ieee802_1x_hdr *hdr;
 705         const struct wpa_eapol_key *key;
 706         u16 key_info;
 707         size_t plen;
 708
 709         /* TODO: Support other EAPOL packets than just EAPOL-Key */
 710
 711         if (len < sizeof(*hdr) + sizeof(*key))
 712                 return -1;
 713
 714         hdr = (const struct ieee802_1x_hdr *) buf;
 715         key = (const struct wpa_eapol_key *) (hdr + 1);
 716         plen = be_to_host16(hdr->length);
 717
 718         if (hdr->version < EAPOL_VERSION) {
 719                 /* TODO: backwards compatibility */
 720         }
 721         if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
 722                 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame (type %u) discarded, "
 723                         "not a Key frame", hdr->type);
 724                 return -1;
 725         }
 726         if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
 727                 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame payload size %lu "
 728                            "invalid (frame size %lu)",
 729                            (unsigned long) plen, (unsigned long) len);
 730                 return -1;
 731         }
 732
 733         if (key->type != EAPOL_KEY_TYPE_RSN) {
 734                 wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key type (%d) unknown, "
 735                            "discarded", key->type);
 736                 return -1;
 737         }
 738
 739         key_info = WPA_GET_BE16(key->key_info);
 740
 741         return !!(key_info & WPA_KEY_INFO_ACK);
 742 }
 743
 744
 745 static int ibss_rsn_process_rx_eapol(struct ibss_rsn *ibss_rsn,
 746                                      struct ibss_rsn_peer *peer,
 747                                      const u8 *buf, size_t len)
 748 {
 749         int supp;
 750         u8 *tmp;
 751
 752         supp = ibss_rsn_eapol_dst_supp(buf, len);
 753         if (supp < 0)
 754                 return -1;
 755
 756         tmp = os_malloc(len);
 757         if (tmp == NULL)
 758                 return -1;
 759         os_memcpy(tmp, buf, len);
 760         if (supp) {
 761                 peer->authentication_status |= IBSS_RSN_AUTH_EAPOL_BY_PEER;
 762                 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Supplicant from "
 763                            MACSTR, MAC2STR(peer->addr));
 764                 wpa_sm_rx_eapol(peer->supp, peer->addr, tmp, len);
 765         } else {
 766                 if (ibss_rsn_is_auth_started(peer) == 0) {
 767                         wpa_printf(MSG_DEBUG, "RSN: IBSS EAPOL for "
 768                                    "Authenticator dropped as " MACSTR " is not "
 769                                    "authenticated", MAC2STR(peer->addr));
 770                         os_free(tmp);
 771                         return -1;
 772                 }
 773
 774                 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Authenticator "
 775                            "from "MACSTR, MAC2STR(peer->addr));
 776                 wpa_receive(ibss_rsn->auth_group, peer->auth, tmp, len);
 777         }
 778         os_free(tmp);
 779
 780         return 1;
 781 }
 782
 783
 784 int ibss_rsn_rx_eapol(struct ibss_rsn *ibss_rsn, const u8 *src_addr,
 785                       const u8 *buf, size_t len)
 786 {
 787         struct ibss_rsn_peer *peer;
 788
 789         if (ibss_rsn == NULL)
 790                 return -1;
 791
 792         peer = ibss_rsn_get_peer(ibss_rsn, src_addr);
 793         if (peer)
 794                 return ibss_rsn_process_rx_eapol(ibss_rsn, peer, buf, len);
 795
 796         if (ibss_rsn_eapol_dst_supp(buf, len) > 0) {
 797                 /*
 798                  * Create new IBSS peer based on an EAPOL message from the peer
 799                  * Authenticator.
 800                  */
 801                 peer = ibss_rsn_peer_init(ibss_rsn, src_addr);
 802                 if (peer == NULL)
 803                         return -1;
 804
 805                 /* assume the peer is authenticated already */
 806                 wpa_printf(MSG_DEBUG, "RSN: IBSS Not using IBSS Auth for peer "
 807                            MACSTR, MAC2STR(src_addr));
 808                 ibss_rsn_peer_authenticated(ibss_rsn, peer,
 809                                             IBSS_RSN_AUTH_EAPOL_BY_US);
 810
 811                 return ibss_rsn_process_rx_eapol(ibss_rsn, ibss_rsn->peers,
 812                                                  buf, len);
 813         }
 814
 815         return 0;
 816 }
 817
 818 void ibss_rsn_set_psk(struct ibss_rsn *ibss_rsn, const u8 *psk)
 819 {
 820         if (ibss_rsn == NULL)
 821                 return;
 822         os_memcpy(ibss_rsn->psk, psk, PMK_LEN);
 823 }
 824
 825
 826 static void ibss_rsn_handle_auth_1_of_2(struct ibss_rsn *ibss_rsn,
 827                                         struct ibss_rsn_peer *peer,
 828                                         const u8* addr)
 829 {
 830         wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 1) from " MACSTR,
 831                    MAC2STR(addr));
 832
 833         if (peer &&
 834             peer->authentication_status & IBSS_RSN_AUTH_EAPOL_BY_PEER) {
 835                 if (peer->own_auth_tx.sec) {
 836                         struct os_time now, diff;
 837                         os_get_time(&now);
 838                         os_time_sub(&now, &peer->own_auth_tx, &diff);
 839                         if (diff.sec == 0 && diff.usec < 500000) {
 840                                 wpa_printf(MSG_DEBUG, "RSN: Skip IBSS reinit since only %u usec from own Auth frame TX",
 841                                            (int) diff.usec);
 842                                 goto skip_reinit;
 843                         }
 844                 }
 845                 /*
 846                  * A peer sent us an Authentication frame even though it already
 847                  * started an EAPOL session. We should reinit state machines
 848                  * here, but it's much more complicated than just deleting and
 849                  * recreating the state machine
 850                  */
 851                 wpa_printf(MSG_DEBUG, "RSN: IBSS Reinitializing station "
 852                            MACSTR, MAC2STR(addr));
 853
 854                 ibss_rsn_stop(ibss_rsn, addr);
 855                 peer = NULL;
 856         }
 857
 858         if (!peer) {
 859                 peer = ibss_rsn_peer_init(ibss_rsn, addr);
 860                 if (!peer)
 861                         return;
 862
 863                 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth started by peer " MACSTR,
 864                            MAC2STR(addr));
 865         }
 866
 867 skip_reinit:
 868         /* reply with an Authentication frame now, before sending an EAPOL */
 869         ibss_rsn_send_auth(ibss_rsn, addr, 2);
 870         /* no need to start another AUTH challenge in the other way.. */
 871         ibss_rsn_peer_authenticated(ibss_rsn, peer, IBSS_RSN_AUTH_EAPOL_BY_US);
 872 }
 873
 874
 875 void ibss_rsn_handle_auth(struct ibss_rsn *ibss_rsn, const u8 *auth_frame,
 876                           size_t len)
 877 {
 878         const struct ieee80211_mgmt *header;
 879         struct ibss_rsn_peer *peer;
 880         size_t auth_length;
 881
 882         header = (const struct ieee80211_mgmt *) auth_frame;
 883         auth_length = IEEE80211_HDRLEN + sizeof(header->u.auth);
 884
 885         if (ibss_rsn == NULL || len < auth_length)
 886                 return;
 887
 888         if (le_to_host16(header->u.auth.auth_alg) != WLAN_AUTH_OPEN ||
 889             le_to_host16(header->u.auth.status_code) != WLAN_STATUS_SUCCESS)
 890                 return;
 891
 892         peer = ibss_rsn_get_peer(ibss_rsn, header->sa);
 893
 894         switch (le_to_host16(header->u.auth.auth_transaction)) {
 895         case 1:
 896                 ibss_rsn_handle_auth_1_of_2(ibss_rsn, peer, header->sa);
 897                 break;
 898         case 2:
 899                 wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 2) from "
 900                            MACSTR, MAC2STR(header->sa));
 901                 if (!peer) {
 902                         wpa_printf(MSG_DEBUG, "RSN: Received Auth seq 2 from "
 903                                    "unknown STA " MACSTR, MAC2STR(header->sa));
 904                         break;
 905                 }
 906
 907                 /* authentication has been completed */
 908                 eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL);
 909                 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth completed with " MACSTR,
 910                            MAC2STR(header->sa));
 911                 ibss_rsn_peer_authenticated(ibss_rsn, peer,
 912                                             IBSS_RSN_AUTH_BY_US);
 913                 break;
 914         }
 915 }