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 -1;
  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                 os_free(ctx);
 225                 return -1;
 226         }
 227
 228         wpa_sm_set_own_addr(peer->supp, own_addr);
 229         wpa_sm_set_param(peer->supp, WPA_PARAM_RSN_ENABLED, 1);
 230         wpa_sm_set_param(peer->supp, WPA_PARAM_PROTO, WPA_PROTO_RSN);
 231         wpa_sm_set_param(peer->supp, WPA_PARAM_PAIRWISE, WPA_CIPHER_CCMP);
 232         wpa_sm_set_param(peer->supp, WPA_PARAM_GROUP, WPA_CIPHER_CCMP);
 233         wpa_sm_set_param(peer->supp, WPA_PARAM_KEY_MGMT, WPA_KEY_MGMT_PSK);
 234         wpa_sm_set_pmk(peer->supp, psk, PMK_LEN, NULL, NULL);
 235
 236         peer->supp_ie_len = sizeof(peer->supp_ie);
 237         if (wpa_sm_set_assoc_wpa_ie_default(peer->supp, peer->supp_ie,
 238                                             &peer->supp_ie_len) < 0) {
 239                 wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_set_assoc_wpa_ie_default()"
 240                            " failed");
 241                 return -1;
 242         }
 243
 244         wpa_sm_notify_assoc(peer->supp, peer->addr);
 245
 246         return 0;
 247 }
 248
 249
 250 static void auth_logger(void *ctx, const u8 *addr, logger_level level,
 251                         const char *txt)
 252 {
 253         if (addr)
 254                 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " - %s",
 255                            MAC2STR(addr), txt);
 256         else
 257                 wpa_printf(MSG_DEBUG, "AUTH: %s", txt);
 258 }
 259
 260
 261 static const u8 * auth_get_psk(void *ctx, const u8 *addr,
 262                                const u8 *p2p_dev_addr, const u8 *prev_psk)
 263 {
 264         struct ibss_rsn *ibss_rsn = ctx;
 265         wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",
 266                    __func__, MAC2STR(addr), prev_psk);
 267         if (prev_psk)
 268                 return NULL;
 269         return ibss_rsn->psk;
 270 }
 271
 272
 273 static int auth_send_eapol(void *ctx, const u8 *addr, const u8 *data,
 274                            size_t data_len, int encrypt)
 275 {
 276         struct ibss_rsn *ibss_rsn = ctx;
 277         struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
 278
 279         wpa_printf(MSG_DEBUG, "AUTH: %s(addr=" MACSTR " data_len=%lu "
 280                    "encrypt=%d)",
 281                    __func__, MAC2STR(addr), (unsigned long) data_len, encrypt);
 282
 283         if (wpa_s->l2)
 284                 return l2_packet_send(wpa_s->l2, addr, ETH_P_EAPOL, data,
 285                                       data_len);
 286
 287         return -1;
 288 }
 289
 290
 291 static int auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
 292                         const u8 *addr, int idx, u8 *key, size_t key_len)
 293 {
 294         struct ibss_rsn *ibss_rsn = ctx;
 295         u8 seq[6];
 296
 297         os_memset(seq, 0, sizeof(seq));
 298
 299         if (addr) {
 300                 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d addr=" MACSTR
 301                            " key_idx=%d)",
 302                            __func__, alg, MAC2STR(addr), idx);
 303         } else {
 304                 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d key_idx=%d)",
 305                            __func__, alg, idx);
 306         }
 307         wpa_hexdump_key(MSG_DEBUG, "AUTH: set_key - key", key, key_len);
 308
 309         if (idx == 0) {
 310                 if (addr) {
 311                         struct ibss_rsn_peer *peer;
 312                         peer = ibss_rsn_get_peer(ibss_rsn, addr);
 313                         if (peer) {
 314                                 peer->authentication_status |=
 315                                         IBSS_RSN_SET_PTK_AUTH;
 316                                 ibss_check_rsn_completed(peer);
 317                         }
 318                 }
 319                 /*
 320                  * In IBSS RSN, the pairwise key from the 4-way handshake
 321                  * initiated by the peer with highest MAC address is used.
 322                  */
 323                 if (addr == NULL ||
 324                     os_memcmp(ibss_rsn->wpa_s->own_addr, addr, ETH_ALEN) < 0) {
 325                         wpa_printf(MSG_DEBUG, "AUTH: Do not use this PTK");
 326                         return 0;
 327                 }
 328         }
 329
 330         return wpa_drv_set_key(ibss_rsn->wpa_s, alg, addr, idx,
 331                                1, seq, 6, key, key_len);
 332 }
 333
 334
 335 static void ibss_rsn_disconnect(void *ctx, const u8 *addr, u16 reason)
 336 {
 337         struct ibss_rsn *ibss_rsn = ctx;
 338         wpa_drv_sta_deauth(ibss_rsn->wpa_s, addr, reason);
 339 }
 340
 341
 342 static int auth_for_each_sta(void *ctx, int (*cb)(struct wpa_state_machine *sm,
 343                                                   void *ctx),
 344                              void *cb_ctx)
 345 {
 346         struct ibss_rsn *ibss_rsn = ctx;
 347         struct ibss_rsn_peer *peer;
 348
 349         wpa_printf(MSG_DEBUG, "AUTH: for_each_sta");
 350
 351         for (peer = ibss_rsn->peers; peer; peer = peer->next) {
 352                 if (peer->auth && cb(peer->auth, cb_ctx))
 353                         return 1;
 354         }
 355
 356         return 0;
 357 }
 358
 359
 360 static void ibss_set_sta_authorized(struct ibss_rsn *ibss_rsn,
 361                                     struct ibss_rsn_peer *peer, int authorized)
 362 {
 363         int res;
 364
 365         if (authorized) {
 366                 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
 367                                             WPA_STA_AUTHORIZED,
 368                                             WPA_STA_AUTHORIZED, ~0);
 369                 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " authorizing port",
 370                            MAC2STR(peer->addr));
 371         } else {
 372                 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
 373                                             0, 0, ~WPA_STA_AUTHORIZED);
 374                 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " unauthorizing port",
 375                            MAC2STR(peer->addr));
 376         }
 377
 378         if (res && errno != ENOENT) {
 379                 wpa_printf(MSG_DEBUG, "Could not set station " MACSTR " flags "
 380                            "for kernel driver (errno=%d)",
 381                            MAC2STR(peer->addr), errno);
 382         }
 383 }
 384
 385
 386 static void auth_set_eapol(void *ctx, const u8 *addr,
 387                                        wpa_eapol_variable var, int value)
 388 {
 389         struct ibss_rsn *ibss_rsn = ctx;
 390         struct ibss_rsn_peer *peer = ibss_rsn_get_peer(ibss_rsn, addr);
 391
 392         if (peer == NULL)
 393                 return;
 394
 395         switch (var) {
 396         case WPA_EAPOL_authorized:
 397                 ibss_set_sta_authorized(ibss_rsn, peer, value);
 398                 break;
 399         default:
 400                 /* do not handle any other event */
 401                 wpa_printf(MSG_DEBUG, "AUTH: eapol event not handled %d", var);
 402                 break;
 403         }
 404 }
 405
 406
 407 static int ibss_rsn_auth_init_group(struct ibss_rsn *ibss_rsn,
 408                                     const u8 *own_addr, struct wpa_ssid *ssid)
 409 {
 410         struct wpa_auth_config conf;
 411         struct wpa_auth_callbacks cb;
 412
 413         wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
 414
 415         os_memset(&conf, 0, sizeof(conf));
 416         conf.wpa = 2;
 417         conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;
 418         conf.wpa_pairwise = WPA_CIPHER_CCMP;
 419         conf.rsn_pairwise = WPA_CIPHER_CCMP;
 420         conf.wpa_group = WPA_CIPHER_CCMP;
 421         conf.eapol_version = 2;
 422         conf.wpa_group_rekey = ssid->group_rekey ? ssid->group_rekey : 600;
 423
 424         os_memset(&cb, 0, sizeof(cb));
 425         cb.ctx = ibss_rsn;
 426         cb.logger = auth_logger;
 427         cb.set_eapol = auth_set_eapol;
 428         cb.send_eapol = auth_send_eapol;
 429         cb.get_psk = auth_get_psk;
 430         cb.set_key = auth_set_key;
 431         cb.for_each_sta = auth_for_each_sta;
 432         cb.disconnect = ibss_rsn_disconnect;
 433
 434         ibss_rsn->auth_group = wpa_init(own_addr, &conf, &cb);
 435         if (ibss_rsn->auth_group == NULL) {
 436                 wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
 437                 return -1;
 438         }
 439
 440         wpa_init_keys(ibss_rsn->auth_group);
 441
 442         return 0;
 443 }
 444
 445
 446 static int ibss_rsn_auth_init(struct ibss_rsn *ibss_rsn,
 447                               struct ibss_rsn_peer *peer)
 448 {
 449         peer->auth = wpa_auth_sta_init(ibss_rsn->auth_group, peer->addr, NULL);
 450         if (peer->auth == NULL) {
 451                 wpa_printf(MSG_DEBUG, "AUTH: wpa_auth_sta_init() failed");
 452                 return -1;
 453         }
 454
 455         /* TODO: get peer RSN IE with Probe Request */
 456         if (wpa_validate_wpa_ie(ibss_rsn->auth_group, peer->auth,
 457                                 (u8 *) "\x30\x14\x01\x00"
 458                                 "\x00\x0f\xac\x04"
 459                                 "\x01\x00\x00\x0f\xac\x04"
 460                                 "\x01\x00\x00\x0f\xac\x02"
 461                                 "\x00\x00", 22, NULL, 0) !=
 462             WPA_IE_OK) {
 463                 wpa_printf(MSG_DEBUG, "AUTH: wpa_validate_wpa_ie() failed");
 464                 return -1;
 465         }
 466
 467         if (wpa_auth_sm_event(peer->auth, WPA_ASSOC))
 468                 return -1;
 469
 470         if (wpa_auth_sta_associated(ibss_rsn->auth_group, peer->auth))
 471                 return -1;
 472
 473         return 0;
 474 }
 475
 476
 477 static int ibss_rsn_send_auth(struct ibss_rsn *ibss_rsn, const u8 *da, int seq)
 478 {
 479         struct ieee80211_mgmt auth;
 480         const size_t auth_length = IEEE80211_HDRLEN + sizeof(auth.u.auth);
 481         struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
 482
 483         if (wpa_s->driver->send_frame == NULL)
 484                 return -1;
 485
 486         os_memset(&auth, 0, sizeof(auth));
 487
 488         auth.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 489                                           WLAN_FC_STYPE_AUTH);
 490         os_memcpy(auth.da, da, ETH_ALEN);
 491         os_memcpy(auth.sa, wpa_s->own_addr, ETH_ALEN);
 492         os_memcpy(auth.bssid, wpa_s->bssid, ETH_ALEN);
 493
 494         auth.u.auth.auth_alg = host_to_le16(WLAN_AUTH_OPEN);
 495         auth.u.auth.auth_transaction = host_to_le16(seq);
 496         auth.u.auth.status_code = host_to_le16(WLAN_STATUS_SUCCESS);
 497
 498         wpa_printf(MSG_DEBUG, "RSN: IBSS TX Auth frame (SEQ %d) to " MACSTR,
 499                    seq, MAC2STR(da));
 500
 501         return wpa_s->driver->send_frame(wpa_s->drv_priv, (u8 *) &auth,
 502                                          auth_length, 0);
 503 }
 504
 505
 506 static int ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)
 507 {
 508         return peer->authentication_status &
 509                (IBSS_RSN_AUTH_BY_US | IBSS_RSN_AUTH_EAPOL_BY_US);
 510 }
 511
 512
 513 static struct ibss_rsn_peer *
 514 ibss_rsn_peer_init(struct ibss_rsn *ibss_rsn, const u8 *addr)
 515 {
 516         struct ibss_rsn_peer *peer;
 517         if (ibss_rsn == NULL)
 518                 return NULL;
 519
 520         peer = ibss_rsn_get_peer(ibss_rsn, addr);
 521         if (peer) {
 522                 wpa_printf(MSG_DEBUG, "RSN: IBSS Supplicant for peer "MACSTR
 523                            " already running", MAC2STR(addr));
 524                 return peer;
 525         }
 526
 527         wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Supplicant for peer "MACSTR,
 528                    MAC2STR(addr));
 529
 530         peer = os_zalloc(sizeof(*peer));
 531         if (peer == NULL) {
 532                 wpa_printf(MSG_DEBUG, "RSN: Could not allocate memory.");
 533                 return NULL;
 534         }
 535
 536         peer->ibss_rsn = ibss_rsn;
 537         os_memcpy(peer->addr, addr, ETH_ALEN);
 538         peer->authentication_status = IBSS_RSN_AUTH_NOT_AUTHENTICATED;
 539
 540         if (ibss_rsn_supp_init(peer, ibss_rsn->wpa_s->own_addr,
 541                                ibss_rsn->psk) < 0) {
 542                 ibss_rsn_free(peer);
 543                 return NULL;
 544         }
 545
 546         peer->next = ibss_rsn->peers;
 547         ibss_rsn->peers = peer;
 548
 549         return peer;
 550 }
 551
 552
 553 static void ibss_rsn_auth_timeout(void *eloop_ctx, void *timeout_ctx)
 554 {
 555         struct ibss_rsn_peer *peer = eloop_ctx;
 556
 557         /*
 558          * Assume peer does not support Authentication exchange or the frame was
 559          * lost somewhere - start EAPOL Authenticator.
 560          */
 561         wpa_printf(MSG_DEBUG,
 562                    "RSN: Timeout on waiting Authentication frame response from "
 563                    MACSTR " - start authenticator", MAC2STR(peer->addr));
 564
 565         peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
 566         ibss_rsn_auth_init(peer->ibss_rsn, peer);
 567 }
 568
 569
 570 int ibss_rsn_start(struct ibss_rsn *ibss_rsn, const u8 *addr)
 571 {
 572         struct ibss_rsn_peer *peer;
 573         int res;
 574
 575         if (!ibss_rsn)
 576                 return -1;
 577
 578         /* if the peer already exists, exit immediately */
 579         peer = ibss_rsn_get_peer(ibss_rsn, addr);
 580         if (peer)
 581                 return 0;
 582
 583         peer = ibss_rsn_peer_init(ibss_rsn, addr);
 584         if (peer == NULL)
 585                 return -1;
 586
 587         /* Open Authentication: send first Authentication frame */
 588         res = ibss_rsn_send_auth(ibss_rsn, addr, 1);
 589         if (res) {
 590                 /*
 591                  * The driver may not support Authentication frame exchange in
 592                  * IBSS. Ignore authentication and go through EAPOL exchange.
 593                  */
 594                 peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
 595                 return ibss_rsn_auth_init(ibss_rsn, peer);
 596         } else {
 597                 os_get_reltime(&peer->own_auth_tx);
 598                 eloop_register_timeout(1, 0, ibss_rsn_auth_timeout, peer, NULL);
 599         }
 600
 601         return 0;
 602 }
 603
 604
 605 static int ibss_rsn_peer_authenticated(struct ibss_rsn *ibss_rsn,
 606                                        struct ibss_rsn_peer *peer, int reason)
 607 {
 608         int already_started;
 609
 610         if (ibss_rsn == NULL || peer == NULL)
 611                 return -1;
 612
 613         already_started = ibss_rsn_is_auth_started(peer);
 614         peer->authentication_status |= reason;
 615
 616         if (already_started) {
 617                 wpa_printf(MSG_DEBUG, "RSN: IBSS Authenticator already "
 618                            "started for peer " MACSTR, MAC2STR(peer->addr));
 619                 return 0;
 620         }
 621
 622         wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Authenticator "
 623                    "for now-authenticated peer " MACSTR, MAC2STR(peer->addr));
 624
 625         return ibss_rsn_auth_init(ibss_rsn, peer);
 626 }
 627
 628
 629 void ibss_rsn_stop(struct ibss_rsn *ibss_rsn, const u8 *peermac)
 630 {
 631         struct ibss_rsn_peer *peer, *prev;
 632
 633         if (ibss_rsn == NULL)
 634                 return;
 635
 636         if (peermac == NULL) {
 637                 /* remove all peers */
 638                 wpa_printf(MSG_DEBUG, "%s: Remove all peers", __func__);
 639                 peer = ibss_rsn->peers;
 640                 while (peer) {
 641                         prev = peer;
 642                         peer = peer->next;
 643                         ibss_rsn_free(prev);
 644                         ibss_rsn->peers = peer;
 645                 }
 646         } else {
 647                 /* remove specific peer */
 648                 wpa_printf(MSG_DEBUG, "%s: Remove specific peer " MACSTR,
 649                            __func__, MAC2STR(peermac));
 650
 651                 for (prev = NULL, peer = ibss_rsn->peers; peer != NULL;
 652                      prev = peer, peer = peer->next) {
 653                         if (os_memcmp(peermac, peer->addr, ETH_ALEN) == 0) {
 654                                 if (prev == NULL)
 655                                         ibss_rsn->peers = peer->next;
 656                                 else
 657                                         prev->next = peer->next;
 658                                 ibss_rsn_free(peer);
 659                                 wpa_printf(MSG_DEBUG, "%s: Successfully "
 660                                            "removed a specific peer",
 661                                            __func__);
 662                                 break;
 663                         }
 664                 }
 665         }
 666 }
 667
 668
 669 struct ibss_rsn * ibss_rsn_init(struct wpa_supplicant *wpa_s,
 670                                 struct wpa_ssid *ssid)
 671 {
 672         struct ibss_rsn *ibss_rsn;
 673
 674         ibss_rsn = os_zalloc(sizeof(*ibss_rsn));
 675         if (ibss_rsn == NULL)
 676                 return NULL;
 677         ibss_rsn->wpa_s = wpa_s;
 678
 679         if (ibss_rsn_auth_init_group(ibss_rsn, wpa_s->own_addr, ssid) < 0) {
 680                 ibss_rsn_deinit(ibss_rsn);
 681                 return NULL;
 682         }
 683
 684         return ibss_rsn;
 685 }
 686
 687
 688 void ibss_rsn_deinit(struct ibss_rsn *ibss_rsn)
 689 {
 690         struct ibss_rsn_peer *peer, *prev;
 691
 692         if (ibss_rsn == NULL)
 693                 return;
 694
 695         peer = ibss_rsn->peers;
 696         while (peer) {
 697                 prev = peer;
 698                 peer = peer->next;
 699                 ibss_rsn_free(prev);
 700         }
 701
 702         if (ibss_rsn->auth_group)
 703                 wpa_deinit(ibss_rsn->auth_group);
 704         os_free(ibss_rsn);
 705
 706 }
 707
 708
 709 static int ibss_rsn_eapol_dst_supp(const u8 *buf, size_t len)
 710 {
 711         const struct ieee802_1x_hdr *hdr;
 712         const struct wpa_eapol_key *key;
 713         u16 key_info;
 714         size_t plen;
 715
 716         /* TODO: Support other EAPOL packets than just EAPOL-Key */
 717
 718         if (len < sizeof(*hdr) + sizeof(*key))
 719                 return -1;
 720
 721         hdr = (const struct ieee802_1x_hdr *) buf;
 722         key = (const struct wpa_eapol_key *) (hdr + 1);
 723         plen = be_to_host16(hdr->length);
 724
 725         if (hdr->version < EAPOL_VERSION) {
 726                 /* TODO: backwards compatibility */
 727         }
 728         if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
 729                 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame (type %u) discarded, "
 730                         "not a Key frame", hdr->type);
 731                 return -1;
 732         }
 733         if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
 734                 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame payload size %lu "
 735                            "invalid (frame size %lu)",
 736                            (unsigned long) plen, (unsigned long) len);
 737                 return -1;
 738         }
 739
 740         if (key->type != EAPOL_KEY_TYPE_RSN) {
 741                 wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key type (%d) unknown, "
 742                            "discarded", key->type);
 743                 return -1;
 744         }
 745
 746         key_info = WPA_GET_BE16(key->key_info);
 747
 748         return !!(key_info & WPA_KEY_INFO_ACK);
 749 }
 750
 751
 752 static int ibss_rsn_process_rx_eapol(struct ibss_rsn *ibss_rsn,
 753                                      struct ibss_rsn_peer *peer,
 754                                      const u8 *buf, size_t len)
 755 {
 756         int supp;
 757         u8 *tmp;
 758
 759         supp = ibss_rsn_eapol_dst_supp(buf, len);
 760         if (supp < 0)
 761                 return -1;
 762
 763         tmp = os_malloc(len);
 764         if (tmp == NULL)
 765                 return -1;
 766         os_memcpy(tmp, buf, len);
 767         if (supp) {
 768                 peer->authentication_status |= IBSS_RSN_AUTH_EAPOL_BY_PEER;
 769                 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Supplicant from "
 770                            MACSTR, MAC2STR(peer->addr));
 771                 wpa_sm_rx_eapol(peer->supp, peer->addr, tmp, len);
 772         } else {
 773                 if (ibss_rsn_is_auth_started(peer) == 0) {
 774                         wpa_printf(MSG_DEBUG, "RSN: IBSS EAPOL for "
 775                                    "Authenticator dropped as " MACSTR " is not "
 776                                    "authenticated", MAC2STR(peer->addr));
 777                         os_free(tmp);
 778                         return -1;
 779                 }
 780
 781                 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Authenticator "
 782                            "from "MACSTR, MAC2STR(peer->addr));
 783                 wpa_receive(ibss_rsn->auth_group, peer->auth, tmp, len);
 784         }
 785         os_free(tmp);
 786
 787         return 1;
 788 }
 789
 790
 791 int ibss_rsn_rx_eapol(struct ibss_rsn *ibss_rsn, const u8 *src_addr,
 792                       const u8 *buf, size_t len)
 793 {
 794         struct ibss_rsn_peer *peer;
 795
 796         if (ibss_rsn == NULL)
 797                 return -1;
 798
 799         peer = ibss_rsn_get_peer(ibss_rsn, src_addr);
 800         if (peer)
 801                 return ibss_rsn_process_rx_eapol(ibss_rsn, peer, buf, len);
 802
 803         if (ibss_rsn_eapol_dst_supp(buf, len) > 0) {
 804                 /*
 805                  * Create new IBSS peer based on an EAPOL message from the peer
 806                  * Authenticator.
 807                  */
 808                 peer = ibss_rsn_peer_init(ibss_rsn, src_addr);
 809                 if (peer == NULL)
 810                         return -1;
 811
 812                 /* assume the peer is authenticated already */
 813                 wpa_printf(MSG_DEBUG, "RSN: IBSS Not using IBSS Auth for peer "
 814                            MACSTR, MAC2STR(src_addr));
 815                 ibss_rsn_peer_authenticated(ibss_rsn, peer,
 816                                             IBSS_RSN_AUTH_EAPOL_BY_US);
 817
 818                 return ibss_rsn_process_rx_eapol(ibss_rsn, ibss_rsn->peers,
 819                                                  buf, len);
 820         }
 821
 822         return 0;
 823 }
 824
 825 void ibss_rsn_set_psk(struct ibss_rsn *ibss_rsn, const u8 *psk)
 826 {
 827         if (ibss_rsn == NULL)
 828                 return;
 829         os_memcpy(ibss_rsn->psk, psk, PMK_LEN);
 830 }
 831
 832
 833 static void ibss_rsn_handle_auth_1_of_2(struct ibss_rsn *ibss_rsn,
 834                                         struct ibss_rsn_peer *peer,
 835                                         const u8* addr)
 836 {
 837         wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 1) from " MACSTR,
 838                    MAC2STR(addr));
 839
 840         if (peer &&
 841             peer->authentication_status & IBSS_RSN_AUTH_EAPOL_BY_PEER) {
 842                 if (peer->own_auth_tx.sec) {
 843                         struct os_reltime now, diff;
 844                         os_get_reltime(&now);
 845                         os_reltime_sub(&now, &peer->own_auth_tx, &diff);
 846                         if (diff.sec == 0 && diff.usec < 500000) {
 847                                 wpa_printf(MSG_DEBUG, "RSN: Skip IBSS reinit since only %u usec from own Auth frame TX",
 848                                            (int) diff.usec);
 849                                 goto skip_reinit;
 850                         }
 851                 }
 852                 /*
 853                  * A peer sent us an Authentication frame even though it already
 854                  * started an EAPOL session. We should reinit state machines
 855                  * here, but it's much more complicated than just deleting and
 856                  * recreating the state machine
 857                  */
 858                 wpa_printf(MSG_DEBUG, "RSN: IBSS Reinitializing station "
 859                            MACSTR, MAC2STR(addr));
 860
 861                 ibss_rsn_stop(ibss_rsn, addr);
 862                 peer = NULL;
 863         }
 864
 865         if (!peer) {
 866                 peer = ibss_rsn_peer_init(ibss_rsn, addr);
 867                 if (!peer)
 868                         return;
 869
 870                 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth started by peer " MACSTR,
 871                            MAC2STR(addr));
 872         }
 873
 874 skip_reinit:
 875         /* reply with an Authentication frame now, before sending an EAPOL */
 876         ibss_rsn_send_auth(ibss_rsn, addr, 2);
 877         /* no need to start another AUTH challenge in the other way.. */
 878         ibss_rsn_peer_authenticated(ibss_rsn, peer, IBSS_RSN_AUTH_EAPOL_BY_US);
 879 }
 880
 881
 882 void ibss_rsn_handle_auth(struct ibss_rsn *ibss_rsn, const u8 *auth_frame,
 883                           size_t len)
 884 {
 885         const struct ieee80211_mgmt *header;
 886         struct ibss_rsn_peer *peer;
 887         size_t auth_length;
 888
 889         header = (const struct ieee80211_mgmt *) auth_frame;
 890         auth_length = IEEE80211_HDRLEN + sizeof(header->u.auth);
 891
 892         if (ibss_rsn == NULL || len < auth_length)
 893                 return;
 894
 895         if (le_to_host16(header->u.auth.auth_alg) != WLAN_AUTH_OPEN ||
 896             le_to_host16(header->u.auth.status_code) != WLAN_STATUS_SUCCESS)
 897                 return;
 898
 899         peer = ibss_rsn_get_peer(ibss_rsn, header->sa);
 900
 901         switch (le_to_host16(header->u.auth.auth_transaction)) {
 902         case 1:
 903                 ibss_rsn_handle_auth_1_of_2(ibss_rsn, peer, header->sa);
 904                 break;
 905         case 2:
 906                 wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 2) from "
 907                            MACSTR, MAC2STR(header->sa));
 908                 if (!peer) {
 909                         wpa_printf(MSG_DEBUG, "RSN: Received Auth seq 2 from "
 910                                    "unknown STA " MACSTR, MAC2STR(header->sa));
 911                         break;
 912                 }
 913
 914                 /* authentication has been completed */
 915                 eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL);
 916                 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth completed with " MACSTR,
 917                            MAC2STR(header->sa));
 918                 ibss_rsn_peer_authenticated(ibss_rsn, peer,
 919                                             IBSS_RSN_AUTH_BY_US);
 920                 break;
 921         }
 922 }