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                                size_t *psk_len)
 264 {
 265         struct ibss_rsn *ibss_rsn = ctx;
 266
 267         if (psk_len)
 268                 *psk_len = PMK_LEN;
 269         wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",
 270                    __func__, MAC2STR(addr), prev_psk);
 271         if (prev_psk)
 272                 return NULL;
 273         return ibss_rsn->psk;
 274 }
 275
 276
 277 static int auth_send_eapol(void *ctx, const u8 *addr, const u8 *data,
 278                            size_t data_len, int encrypt)
 279 {
 280         struct ibss_rsn *ibss_rsn = ctx;
 281         struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
 282
 283         wpa_printf(MSG_DEBUG, "AUTH: %s(addr=" MACSTR " data_len=%lu "
 284                    "encrypt=%d)",
 285                    __func__, MAC2STR(addr), (unsigned long) data_len, encrypt);
 286
 287         if (wpa_s->l2)
 288                 return l2_packet_send(wpa_s->l2, addr, ETH_P_EAPOL, data,
 289                                       data_len);
 290
 291         return -1;
 292 }
 293
 294
 295 static int auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
 296                         const u8 *addr, int idx, u8 *key, size_t key_len)
 297 {
 298         struct ibss_rsn *ibss_rsn = ctx;
 299         u8 seq[6];
 300
 301         os_memset(seq, 0, sizeof(seq));
 302
 303         if (addr) {
 304                 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d addr=" MACSTR
 305                            " key_idx=%d)",
 306                            __func__, alg, MAC2STR(addr), idx);
 307         } else {
 308                 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d key_idx=%d)",
 309                            __func__, alg, idx);
 310         }
 311         wpa_hexdump_key(MSG_DEBUG, "AUTH: set_key - key", key, key_len);
 312
 313         if (idx == 0) {
 314                 if (addr) {
 315                         struct ibss_rsn_peer *peer;
 316                         peer = ibss_rsn_get_peer(ibss_rsn, addr);
 317                         if (peer) {
 318                                 peer->authentication_status |=
 319                                         IBSS_RSN_SET_PTK_AUTH;
 320                                 ibss_check_rsn_completed(peer);
 321                         }
 322                 }
 323                 /*
 324                  * In IBSS RSN, the pairwise key from the 4-way handshake
 325                  * initiated by the peer with highest MAC address is used.
 326                  */
 327                 if (addr == NULL ||
 328                     os_memcmp(ibss_rsn->wpa_s->own_addr, addr, ETH_ALEN) < 0) {
 329                         wpa_printf(MSG_DEBUG, "AUTH: Do not use this PTK");
 330                         return 0;
 331                 }
 332         }
 333
 334         return wpa_drv_set_key(ibss_rsn->wpa_s, alg, addr, idx,
 335                                1, seq, 6, key, key_len);
 336 }
 337
 338
 339 static void ibss_rsn_disconnect(void *ctx, const u8 *addr, u16 reason)
 340 {
 341         struct ibss_rsn *ibss_rsn = ctx;
 342         wpa_drv_sta_deauth(ibss_rsn->wpa_s, addr, reason);
 343 }
 344
 345
 346 static int auth_for_each_sta(void *ctx, int (*cb)(struct wpa_state_machine *sm,
 347                                                   void *ctx),
 348                              void *cb_ctx)
 349 {
 350         struct ibss_rsn *ibss_rsn = ctx;
 351         struct ibss_rsn_peer *peer;
 352
 353         wpa_printf(MSG_DEBUG, "AUTH: for_each_sta");
 354
 355         for (peer = ibss_rsn->peers; peer; peer = peer->next) {
 356                 if (peer->auth && cb(peer->auth, cb_ctx))
 357                         return 1;
 358         }
 359
 360         return 0;
 361 }
 362
 363
 364 static void ibss_set_sta_authorized(struct ibss_rsn *ibss_rsn,
 365                                     struct ibss_rsn_peer *peer, int authorized)
 366 {
 367         int res;
 368
 369         if (authorized) {
 370                 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
 371                                             WPA_STA_AUTHORIZED,
 372                                             WPA_STA_AUTHORIZED, ~0);
 373                 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " authorizing port",
 374                            MAC2STR(peer->addr));
 375         } else {
 376                 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
 377                                             0, 0, ~WPA_STA_AUTHORIZED);
 378                 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " unauthorizing port",
 379                            MAC2STR(peer->addr));
 380         }
 381
 382         if (res && errno != ENOENT) {
 383                 wpa_printf(MSG_DEBUG, "Could not set station " MACSTR " flags "
 384                            "for kernel driver (errno=%d)",
 385                            MAC2STR(peer->addr), errno);
 386         }
 387 }
 388
 389
 390 static void auth_set_eapol(void *ctx, const u8 *addr,
 391                                        wpa_eapol_variable var, int value)
 392 {
 393         struct ibss_rsn *ibss_rsn = ctx;
 394         struct ibss_rsn_peer *peer = ibss_rsn_get_peer(ibss_rsn, addr);
 395
 396         if (peer == NULL)
 397                 return;
 398
 399         switch (var) {
 400         case WPA_EAPOL_authorized:
 401                 ibss_set_sta_authorized(ibss_rsn, peer, value);
 402                 break;
 403         default:
 404                 /* do not handle any other event */
 405                 wpa_printf(MSG_DEBUG, "AUTH: eapol event not handled %d", var);
 406                 break;
 407         }
 408 }
 409
 410
 411 static int ibss_rsn_auth_init_group(struct ibss_rsn *ibss_rsn,
 412                                     const u8 *own_addr, struct wpa_ssid *ssid)
 413 {
 414         struct wpa_auth_config conf;
 415         static const struct wpa_auth_callbacks cb = {
 416                 .logger = auth_logger,
 417                 .set_eapol = auth_set_eapol,
 418                 .send_eapol = auth_send_eapol,
 419                 .get_psk = auth_get_psk,
 420                 .set_key = auth_set_key,
 421                 .for_each_sta = auth_for_each_sta,
 422                 .disconnect = ibss_rsn_disconnect,
 423         };
 424
 425         wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
 426
 427         os_memset(&conf, 0, sizeof(conf));
 428         conf.wpa = 2;
 429         conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;
 430         conf.wpa_pairwise = WPA_CIPHER_CCMP;
 431         conf.rsn_pairwise = WPA_CIPHER_CCMP;
 432         conf.wpa_group = WPA_CIPHER_CCMP;
 433         conf.eapol_version = 2;
 434         conf.wpa_group_rekey = ssid->group_rekey ? ssid->group_rekey : 600;
 435         conf.wpa_group_update_count = 4;
 436         conf.wpa_pairwise_update_count = 4;
 437
 438         ibss_rsn->auth_group = wpa_init(own_addr, &conf, &cb, ibss_rsn);
 439         if (ibss_rsn->auth_group == NULL) {
 440                 wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
 441                 return -1;
 442         }
 443
 444         wpa_init_keys(ibss_rsn->auth_group);
 445
 446         return 0;
 447 }
 448
 449
 450 static int ibss_rsn_auth_init(struct ibss_rsn *ibss_rsn,
 451                               struct ibss_rsn_peer *peer)
 452 {
 453         peer->auth = wpa_auth_sta_init(ibss_rsn->auth_group, peer->addr, NULL);
 454         if (peer->auth == NULL) {
 455                 wpa_printf(MSG_DEBUG, "AUTH: wpa_auth_sta_init() failed");
 456                 return -1;
 457         }
 458
 459         /* TODO: get peer RSN IE with Probe Request */
 460         if (wpa_validate_wpa_ie(ibss_rsn->auth_group, peer->auth,
 461                                 (u8 *) "\x30\x14\x01\x00"
 462                                 "\x00\x0f\xac\x04"
 463                                 "\x01\x00\x00\x0f\xac\x04"
 464                                 "\x01\x00\x00\x0f\xac\x02"
 465                                 "\x00\x00", 22, NULL, 0, NULL, 0) !=
 466             WPA_IE_OK) {
 467                 wpa_printf(MSG_DEBUG, "AUTH: wpa_validate_wpa_ie() failed");
 468                 return -1;
 469         }
 470
 471         if (wpa_auth_sm_event(peer->auth, WPA_ASSOC))
 472                 return -1;
 473
 474         if (wpa_auth_sta_associated(ibss_rsn->auth_group, peer->auth))
 475                 return -1;
 476
 477         return 0;
 478 }
 479
 480
 481 static int ibss_rsn_send_auth(struct ibss_rsn *ibss_rsn, const u8 *da, int seq)
 482 {
 483         struct ieee80211_mgmt auth;
 484         const size_t auth_length = IEEE80211_HDRLEN + sizeof(auth.u.auth);
 485         struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
 486
 487         if (wpa_s->driver->send_frame == NULL)
 488                 return -1;
 489
 490         os_memset(&auth, 0, sizeof(auth));
 491
 492         auth.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 493                                           WLAN_FC_STYPE_AUTH);
 494         os_memcpy(auth.da, da, ETH_ALEN);
 495         os_memcpy(auth.sa, wpa_s->own_addr, ETH_ALEN);
 496         os_memcpy(auth.bssid, wpa_s->bssid, ETH_ALEN);
 497
 498         auth.u.auth.auth_alg = host_to_le16(WLAN_AUTH_OPEN);
 499         auth.u.auth.auth_transaction = host_to_le16(seq);
 500         auth.u.auth.status_code = host_to_le16(WLAN_STATUS_SUCCESS);
 501
 502         wpa_printf(MSG_DEBUG, "RSN: IBSS TX Auth frame (SEQ %d) to " MACSTR,
 503                    seq, MAC2STR(da));
 504
 505         return wpa_s->driver->send_frame(wpa_s->drv_priv, (u8 *) &auth,
 506                                          auth_length, 0);
 507 }
 508
 509
 510 static int ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)
 511 {
 512         return peer->authentication_status &
 513                (IBSS_RSN_AUTH_BY_US | IBSS_RSN_AUTH_EAPOL_BY_US);
 514 }
 515
 516
 517 static struct ibss_rsn_peer *
 518 ibss_rsn_peer_init(struct ibss_rsn *ibss_rsn, const u8 *addr)
 519 {
 520         struct ibss_rsn_peer *peer;
 521         if (ibss_rsn == NULL)
 522                 return NULL;
 523
 524         peer = ibss_rsn_get_peer(ibss_rsn, addr);
 525         if (peer) {
 526                 wpa_printf(MSG_DEBUG, "RSN: IBSS Supplicant for peer "MACSTR
 527                            " already running", MAC2STR(addr));
 528                 return peer;
 529         }
 530
 531         wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Supplicant for peer "MACSTR,
 532                    MAC2STR(addr));
 533
 534         peer = os_zalloc(sizeof(*peer));
 535         if (peer == NULL) {
 536                 wpa_printf(MSG_DEBUG, "RSN: Could not allocate memory.");
 537                 return NULL;
 538         }
 539
 540         peer->ibss_rsn = ibss_rsn;
 541         os_memcpy(peer->addr, addr, ETH_ALEN);
 542         peer->authentication_status = IBSS_RSN_AUTH_NOT_AUTHENTICATED;
 543
 544         if (ibss_rsn_supp_init(peer, ibss_rsn->wpa_s->own_addr,
 545                                ibss_rsn->psk) < 0) {
 546                 ibss_rsn_free(peer);
 547                 return NULL;
 548         }
 549
 550         peer->next = ibss_rsn->peers;
 551         ibss_rsn->peers = peer;
 552
 553         return peer;
 554 }
 555
 556
 557 static void ibss_rsn_auth_timeout(void *eloop_ctx, void *timeout_ctx)
 558 {
 559         struct ibss_rsn_peer *peer = eloop_ctx;
 560
 561         /*
 562          * Assume peer does not support Authentication exchange or the frame was
 563          * lost somewhere - start EAPOL Authenticator.
 564          */
 565         wpa_printf(MSG_DEBUG,
 566                    "RSN: Timeout on waiting Authentication frame response from "
 567                    MACSTR " - start authenticator", MAC2STR(peer->addr));
 568
 569         peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
 570         ibss_rsn_auth_init(peer->ibss_rsn, peer);
 571 }
 572
 573
 574 int ibss_rsn_start(struct ibss_rsn *ibss_rsn, const u8 *addr)
 575 {
 576         struct ibss_rsn_peer *peer;
 577         int res;
 578
 579         if (!ibss_rsn)
 580                 return -1;
 581
 582         /* if the peer already exists, exit immediately */
 583         peer = ibss_rsn_get_peer(ibss_rsn, addr);
 584         if (peer)
 585                 return 0;
 586
 587         peer = ibss_rsn_peer_init(ibss_rsn, addr);
 588         if (peer == NULL)
 589                 return -1;
 590
 591         /* Open Authentication: send first Authentication frame */
 592         res = ibss_rsn_send_auth(ibss_rsn, addr, 1);
 593         if (res) {
 594                 /*
 595                  * The driver may not support Authentication frame exchange in
 596                  * IBSS. Ignore authentication and go through EAPOL exchange.
 597                  */
 598                 peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
 599                 return ibss_rsn_auth_init(ibss_rsn, peer);
 600         } else {
 601                 os_get_reltime(&peer->own_auth_tx);
 602                 eloop_register_timeout(1, 0, ibss_rsn_auth_timeout, peer, NULL);
 603         }
 604
 605         return 0;
 606 }
 607
 608
 609 static int ibss_rsn_peer_authenticated(struct ibss_rsn *ibss_rsn,
 610                                        struct ibss_rsn_peer *peer, int reason)
 611 {
 612         int already_started;
 613
 614         if (ibss_rsn == NULL || peer == NULL)
 615                 return -1;
 616
 617         already_started = ibss_rsn_is_auth_started(peer);
 618         peer->authentication_status |= reason;
 619
 620         if (already_started) {
 621                 wpa_printf(MSG_DEBUG, "RSN: IBSS Authenticator already "
 622                            "started for peer " MACSTR, MAC2STR(peer->addr));
 623                 return 0;
 624         }
 625
 626         wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Authenticator "
 627                    "for now-authenticated peer " MACSTR, MAC2STR(peer->addr));
 628
 629         return ibss_rsn_auth_init(ibss_rsn, peer);
 630 }
 631
 632
 633 void ibss_rsn_stop(struct ibss_rsn *ibss_rsn, const u8 *peermac)
 634 {
 635         struct ibss_rsn_peer *peer, *prev;
 636
 637         if (ibss_rsn == NULL)
 638                 return;
 639
 640         if (peermac == NULL) {
 641                 /* remove all peers */
 642                 wpa_printf(MSG_DEBUG, "%s: Remove all peers", __func__);
 643                 peer = ibss_rsn->peers;
 644                 while (peer) {
 645                         prev = peer;
 646                         peer = peer->next;
 647                         ibss_rsn_free(prev);
 648                         ibss_rsn->peers = peer;
 649                 }
 650         } else {
 651                 /* remove specific peer */
 652                 wpa_printf(MSG_DEBUG, "%s: Remove specific peer " MACSTR,
 653                            __func__, MAC2STR(peermac));
 654
 655                 for (prev = NULL, peer = ibss_rsn->peers; peer != NULL;
 656                      prev = peer, peer = peer->next) {
 657                         if (os_memcmp(peermac, peer->addr, ETH_ALEN) == 0) {
 658                                 if (prev == NULL)
 659                                         ibss_rsn->peers = peer->next;
 660                                 else
 661                                         prev->next = peer->next;
 662                                 ibss_rsn_free(peer);
 663                                 wpa_printf(MSG_DEBUG, "%s: Successfully "
 664                                            "removed a specific peer",
 665                                            __func__);
 666                                 break;
 667                         }
 668                 }
 669         }
 670 }
 671
 672
 673 struct ibss_rsn * ibss_rsn_init(struct wpa_supplicant *wpa_s,
 674                                 struct wpa_ssid *ssid)
 675 {
 676         struct ibss_rsn *ibss_rsn;
 677
 678         ibss_rsn = os_zalloc(sizeof(*ibss_rsn));
 679         if (ibss_rsn == NULL)
 680                 return NULL;
 681         ibss_rsn->wpa_s = wpa_s;
 682
 683         if (ibss_rsn_auth_init_group(ibss_rsn, wpa_s->own_addr, ssid) < 0) {
 684                 ibss_rsn_deinit(ibss_rsn);
 685                 return NULL;
 686         }
 687
 688         return ibss_rsn;
 689 }
 690
 691
 692 void ibss_rsn_deinit(struct ibss_rsn *ibss_rsn)
 693 {
 694         struct ibss_rsn_peer *peer, *prev;
 695
 696         if (ibss_rsn == NULL)
 697                 return;
 698
 699         peer = ibss_rsn->peers;
 700         while (peer) {
 701                 prev = peer;
 702                 peer = peer->next;
 703                 ibss_rsn_free(prev);
 704         }
 705
 706         if (ibss_rsn->auth_group)
 707                 wpa_deinit(ibss_rsn->auth_group);
 708         os_free(ibss_rsn);
 709
 710 }
 711
 712
 713 static int ibss_rsn_eapol_dst_supp(const u8 *buf, size_t len)
 714 {
 715         const struct ieee802_1x_hdr *hdr;
 716         const struct wpa_eapol_key *key;
 717         u16 key_info;
 718         size_t plen;
 719
 720         /* TODO: Support other EAPOL packets than just EAPOL-Key */
 721
 722         if (len < sizeof(*hdr) + sizeof(*key))
 723                 return -1;
 724
 725         hdr = (const struct ieee802_1x_hdr *) buf;
 726         key = (const struct wpa_eapol_key *) (hdr + 1);
 727         plen = be_to_host16(hdr->length);
 728
 729         if (hdr->version < EAPOL_VERSION) {
 730                 /* TODO: backwards compatibility */
 731         }
 732         if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
 733                 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame (type %u) discarded, "
 734                         "not a Key frame", hdr->type);
 735                 return -1;
 736         }
 737         if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
 738                 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame payload size %lu "
 739                            "invalid (frame size %lu)",
 740                            (unsigned long) plen, (unsigned long) len);
 741                 return -1;
 742         }
 743
 744         if (key->type != EAPOL_KEY_TYPE_RSN) {
 745                 wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key type (%d) unknown, "
 746                            "discarded", key->type);
 747                 return -1;
 748         }
 749
 750         key_info = WPA_GET_BE16(key->key_info);
 751
 752         return !!(key_info & WPA_KEY_INFO_ACK);
 753 }
 754
 755
 756 static int ibss_rsn_process_rx_eapol(struct ibss_rsn *ibss_rsn,
 757                                      struct ibss_rsn_peer *peer,
 758                                      const u8 *buf, size_t len)
 759 {
 760         int supp;
 761         u8 *tmp;
 762
 763         supp = ibss_rsn_eapol_dst_supp(buf, len);
 764         if (supp < 0)
 765                 return -1;
 766
 767         tmp = os_memdup(buf, len);
 768         if (tmp == NULL)
 769                 return -1;
 770         if (supp) {
 771                 peer->authentication_status |= IBSS_RSN_AUTH_EAPOL_BY_PEER;
 772                 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Supplicant from "
 773                            MACSTR, MAC2STR(peer->addr));
 774                 wpa_sm_rx_eapol(peer->supp, peer->addr, tmp, len);
 775         } else {
 776                 if (ibss_rsn_is_auth_started(peer) == 0) {
 777                         wpa_printf(MSG_DEBUG, "RSN: IBSS EAPOL for "
 778                                    "Authenticator dropped as " MACSTR " is not "
 779                                    "authenticated", MAC2STR(peer->addr));
 780                         os_free(tmp);
 781                         return -1;
 782                 }
 783
 784                 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Authenticator "
 785                            "from "MACSTR, MAC2STR(peer->addr));
 786                 wpa_receive(ibss_rsn->auth_group, peer->auth, tmp, len);
 787         }
 788         os_free(tmp);
 789
 790         return 1;
 791 }
 792
 793
 794 int ibss_rsn_rx_eapol(struct ibss_rsn *ibss_rsn, const u8 *src_addr,
 795                       const u8 *buf, size_t len)
 796 {
 797         struct ibss_rsn_peer *peer;
 798
 799         if (ibss_rsn == NULL)
 800                 return -1;
 801
 802         peer = ibss_rsn_get_peer(ibss_rsn, src_addr);
 803         if (peer)
 804                 return ibss_rsn_process_rx_eapol(ibss_rsn, peer, buf, len);
 805
 806         if (ibss_rsn_eapol_dst_supp(buf, len) > 0) {
 807                 /*
 808                  * Create new IBSS peer based on an EAPOL message from the peer
 809                  * Authenticator.
 810                  */
 811                 peer = ibss_rsn_peer_init(ibss_rsn, src_addr);
 812                 if (peer == NULL)
 813                         return -1;
 814
 815                 /* assume the peer is authenticated already */
 816                 wpa_printf(MSG_DEBUG, "RSN: IBSS Not using IBSS Auth for peer "
 817                            MACSTR, MAC2STR(src_addr));
 818                 ibss_rsn_peer_authenticated(ibss_rsn, peer,
 819                                             IBSS_RSN_AUTH_EAPOL_BY_US);
 820
 821                 return ibss_rsn_process_rx_eapol(ibss_rsn, ibss_rsn->peers,
 822                                                  buf, len);
 823         }
 824
 825         return 0;
 826 }
 827
 828 void ibss_rsn_set_psk(struct ibss_rsn *ibss_rsn, const u8 *psk)
 829 {
 830         if (ibss_rsn == NULL)
 831                 return;
 832         os_memcpy(ibss_rsn->psk, psk, PMK_LEN);
 833 }
 834
 835
 836 static void ibss_rsn_handle_auth_1_of_2(struct ibss_rsn *ibss_rsn,
 837                                         struct ibss_rsn_peer *peer,
 838                                         const u8* addr)
 839 {
 840         wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 1) from " MACSTR,
 841                    MAC2STR(addr));
 842
 843         if (peer &&
 844             peer->authentication_status & (IBSS_RSN_SET_PTK_SUPP |
 845                                            IBSS_RSN_SET_PTK_AUTH)) {
 846                 /* Clear the TK for this pair to allow recovery from the case
 847                  * where the peer STA has restarted and lost its key while we
 848                  * still have a pairwise key configured. */
 849                 wpa_printf(MSG_DEBUG, "RSN: Clear pairwise key for peer "
 850                            MACSTR, MAC2STR(addr));
 851                 wpa_drv_set_key(ibss_rsn->wpa_s, WPA_ALG_NONE, addr, 0, 0,
 852                                 NULL, 0, NULL, 0);
 853         }
 854
 855         if (peer &&
 856             peer->authentication_status & IBSS_RSN_AUTH_EAPOL_BY_PEER) {
 857                 if (peer->own_auth_tx.sec) {
 858                         struct os_reltime now, diff;
 859                         os_get_reltime(&now);
 860                         os_reltime_sub(&now, &peer->own_auth_tx, &diff);
 861                         if (diff.sec == 0 && diff.usec < 500000) {
 862                                 wpa_printf(MSG_DEBUG, "RSN: Skip IBSS reinit since only %u usec from own Auth frame TX",
 863                                            (int) diff.usec);
 864                                 goto skip_reinit;
 865                         }
 866                 }
 867                 /*
 868                  * A peer sent us an Authentication frame even though it already
 869                  * started an EAPOL session. We should reinit state machines
 870                  * here, but it's much more complicated than just deleting and
 871                  * recreating the state machine
 872                  */
 873                 wpa_printf(MSG_DEBUG, "RSN: IBSS Reinitializing station "
 874                            MACSTR, MAC2STR(addr));
 875
 876                 ibss_rsn_stop(ibss_rsn, addr);
 877                 peer = NULL;
 878         }
 879
 880         if (!peer) {
 881                 peer = ibss_rsn_peer_init(ibss_rsn, addr);
 882                 if (!peer)
 883                         return;
 884
 885                 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth started by peer " MACSTR,
 886                            MAC2STR(addr));
 887         }
 888
 889 skip_reinit:
 890         /* reply with an Authentication frame now, before sending an EAPOL */
 891         ibss_rsn_send_auth(ibss_rsn, addr, 2);
 892         /* no need to start another AUTH challenge in the other way.. */
 893         ibss_rsn_peer_authenticated(ibss_rsn, peer, IBSS_RSN_AUTH_EAPOL_BY_US);
 894 }
 895
 896
 897 void ibss_rsn_handle_auth(struct ibss_rsn *ibss_rsn, const u8 *auth_frame,
 898                           size_t len)
 899 {
 900         const struct ieee80211_mgmt *header;
 901         struct ibss_rsn_peer *peer;
 902         size_t auth_length;
 903
 904         header = (const struct ieee80211_mgmt *) auth_frame;
 905         auth_length = IEEE80211_HDRLEN + sizeof(header->u.auth);
 906
 907         if (ibss_rsn == NULL || len < auth_length)
 908                 return;
 909
 910         if (le_to_host16(header->u.auth.auth_alg) != WLAN_AUTH_OPEN ||
 911             le_to_host16(header->u.auth.status_code) != WLAN_STATUS_SUCCESS)
 912                 return;
 913
 914         peer = ibss_rsn_get_peer(ibss_rsn, header->sa);
 915
 916         switch (le_to_host16(header->u.auth.auth_transaction)) {
 917         case 1:
 918                 ibss_rsn_handle_auth_1_of_2(ibss_rsn, peer, header->sa);
 919                 break;
 920         case 2:
 921                 wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 2) from "
 922                            MACSTR, MAC2STR(header->sa));
 923                 if (!peer) {
 924                         wpa_printf(MSG_DEBUG, "RSN: Received Auth seq 2 from "
 925                                    "unknown STA " MACSTR, MAC2STR(header->sa));
 926                         break;
 927                 }
 928
 929                 /* authentication has been completed */
 930                 eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL);
 931                 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth completed with " MACSTR,
 932                            MAC2STR(header->sa));
 933                 ibss_rsn_peer_authenticated(ibss_rsn, peer,
 934                                             IBSS_RSN_AUTH_BY_US);
 935                 break;
 936         }
 937 }