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