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, u16 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, int *vlan_id)
 264 {
 265         struct ibss_rsn *ibss_rsn = ctx;
 266
 267         if (psk_len)
 268                 *psk_len = PMK_LEN;
 269         if (vlan_id)
 270                 *vlan_id = 0;
 271         wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",
 272                    __func__, MAC2STR(addr), prev_psk);
 273         if (prev_psk)
 274                 return NULL;
 275         return ibss_rsn->psk;
 276 }
 277
 278
 279 static int auth_send_eapol(void *ctx, const u8 *addr, const u8 *data,
 280                            size_t data_len, int encrypt)
 281 {
 282         struct ibss_rsn *ibss_rsn = ctx;
 283         struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
 284
 285         wpa_printf(MSG_DEBUG, "AUTH: %s(addr=" MACSTR " data_len=%lu "
 286                    "encrypt=%d)",
 287                    __func__, MAC2STR(addr), (unsigned long) data_len, encrypt);
 288
 289         if (wpa_s->l2)
 290                 return l2_packet_send(wpa_s->l2, addr, ETH_P_EAPOL, data,
 291                                       data_len);
 292
 293         return -1;
 294 }
 295
 296
 297 static int auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
 298                         const u8 *addr, int idx, u8 *key, size_t key_len)
 299 {
 300         struct ibss_rsn *ibss_rsn = ctx;
 301         u8 seq[6];
 302
 303         os_memset(seq, 0, sizeof(seq));
 304
 305         if (addr) {
 306                 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d addr=" MACSTR
 307                            " key_idx=%d)",
 308                            __func__, alg, MAC2STR(addr), idx);
 309         } else {
 310                 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d key_idx=%d)",
 311                            __func__, alg, idx);
 312         }
 313         wpa_hexdump_key(MSG_DEBUG, "AUTH: set_key - key", key, key_len);
 314
 315         if (idx == 0) {
 316                 if (addr) {
 317                         struct ibss_rsn_peer *peer;
 318                         peer = ibss_rsn_get_peer(ibss_rsn, addr);
 319                         if (peer) {
 320                                 peer->authentication_status |=
 321                                         IBSS_RSN_SET_PTK_AUTH;
 322                                 ibss_check_rsn_completed(peer);
 323                         }
 324                 }
 325                 /*
 326                  * In IBSS RSN, the pairwise key from the 4-way handshake
 327                  * initiated by the peer with highest MAC address is used.
 328                  */
 329                 if (addr == NULL ||
 330                     os_memcmp(ibss_rsn->wpa_s->own_addr, addr, ETH_ALEN) < 0) {
 331                         wpa_printf(MSG_DEBUG, "AUTH: Do not use this PTK");
 332                         return 0;
 333                 }
 334         }
 335
 336         return wpa_drv_set_key(ibss_rsn->wpa_s, alg, addr, idx,
 337                                1, seq, 6, key, key_len);
 338 }
 339
 340
 341 static void ibss_rsn_disconnect(void *ctx, const u8 *addr, u16 reason)
 342 {
 343         struct ibss_rsn *ibss_rsn = ctx;
 344         wpa_drv_sta_deauth(ibss_rsn->wpa_s, addr, reason);
 345 }
 346
 347
 348 static int auth_for_each_sta(void *ctx, int (*cb)(struct wpa_state_machine *sm,
 349                                                   void *ctx),
 350                              void *cb_ctx)
 351 {
 352         struct ibss_rsn *ibss_rsn = ctx;
 353         struct ibss_rsn_peer *peer;
 354
 355         wpa_printf(MSG_DEBUG, "AUTH: for_each_sta");
 356
 357         for (peer = ibss_rsn->peers; peer; peer = peer->next) {
 358                 if (peer->auth && cb(peer->auth, cb_ctx))
 359                         return 1;
 360         }
 361
 362         return 0;
 363 }
 364
 365
 366 static void ibss_set_sta_authorized(struct ibss_rsn *ibss_rsn,
 367                                     struct ibss_rsn_peer *peer, int authorized)
 368 {
 369         int res;
 370
 371         if (authorized) {
 372                 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
 373                                             WPA_STA_AUTHORIZED,
 374                                             WPA_STA_AUTHORIZED, ~0);
 375                 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " authorizing port",
 376                            MAC2STR(peer->addr));
 377         } else {
 378                 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
 379                                             0, 0, ~WPA_STA_AUTHORIZED);
 380                 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " unauthorizing port",
 381                            MAC2STR(peer->addr));
 382         }
 383
 384         if (res && errno != ENOENT) {
 385                 wpa_printf(MSG_DEBUG, "Could not set station " MACSTR " flags "
 386                            "for kernel driver (errno=%d)",
 387                            MAC2STR(peer->addr), errno);
 388         }
 389 }
 390
 391
 392 static void auth_set_eapol(void *ctx, const u8 *addr,
 393                                        wpa_eapol_variable var, int value)
 394 {
 395         struct ibss_rsn *ibss_rsn = ctx;
 396         struct ibss_rsn_peer *peer = ibss_rsn_get_peer(ibss_rsn, addr);
 397
 398         if (peer == NULL)
 399                 return;
 400
 401         switch (var) {
 402         case WPA_EAPOL_authorized:
 403                 ibss_set_sta_authorized(ibss_rsn, peer, value);
 404                 break;
 405         default:
 406                 /* do not handle any other event */
 407                 wpa_printf(MSG_DEBUG, "AUTH: eapol event not handled %d", var);
 408                 break;
 409         }
 410 }
 411
 412
 413 static int ibss_rsn_auth_init_group(struct ibss_rsn *ibss_rsn,
 414                                     const u8 *own_addr, struct wpa_ssid *ssid)
 415 {
 416         struct wpa_auth_config conf;
 417         static const struct wpa_auth_callbacks cb = {
 418                 .logger = auth_logger,
 419                 .set_eapol = auth_set_eapol,
 420                 .send_eapol = auth_send_eapol,
 421                 .get_psk = auth_get_psk,
 422                 .set_key = auth_set_key,
 423                 .for_each_sta = auth_for_each_sta,
 424                 .disconnect = ibss_rsn_disconnect,
 425         };
 426
 427         wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
 428
 429         os_memset(&conf, 0, sizeof(conf));
 430         conf.wpa = 2;
 431         conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;
 432         conf.wpa_pairwise = WPA_CIPHER_CCMP;
 433         conf.rsn_pairwise = WPA_CIPHER_CCMP;
 434         conf.wpa_group = WPA_CIPHER_CCMP;
 435         conf.eapol_version = 2;
 436         conf.wpa_group_rekey = ssid->group_rekey ? ssid->group_rekey : 600;
 437         conf.wpa_group_update_count = 4;
 438         conf.wpa_pairwise_update_count = 4;
 439
 440         ibss_rsn->auth_group = wpa_init(own_addr, &conf, &cb, ibss_rsn);
 441         if (ibss_rsn->auth_group == NULL) {
 442                 wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
 443                 return -1;
 444         }
 445
 446         wpa_init_keys(ibss_rsn->auth_group);
 447
 448         return 0;
 449 }
 450
 451
 452 static int ibss_rsn_auth_init(struct ibss_rsn *ibss_rsn,
 453                               struct ibss_rsn_peer *peer)
 454 {
 455         peer->auth = wpa_auth_sta_init(ibss_rsn->auth_group, peer->addr, NULL);
 456         if (peer->auth == NULL) {
 457                 wpa_printf(MSG_DEBUG, "AUTH: wpa_auth_sta_init() failed");
 458                 return -1;
 459         }
 460
 461         /* TODO: get peer RSN IE with Probe Request */
 462         if (wpa_validate_wpa_ie(ibss_rsn->auth_group, peer->auth, 0,
 463                                 (u8 *) "\x30\x14\x01\x00"
 464                                 "\x00\x0f\xac\x04"
 465                                 "\x01\x00\x00\x0f\xac\x04"
 466                                 "\x01\x00\x00\x0f\xac\x02"
 467                                 "\x00\x00", 22, NULL, 0, NULL, 0) !=
 468             WPA_IE_OK) {
 469                 wpa_printf(MSG_DEBUG, "AUTH: wpa_validate_wpa_ie() failed");
 470                 return -1;
 471         }
 472
 473         if (wpa_auth_sm_event(peer->auth, WPA_ASSOC))
 474                 return -1;
 475
 476         if (wpa_auth_sta_associated(ibss_rsn->auth_group, peer->auth))
 477                 return -1;
 478
 479         return 0;
 480 }
 481
 482
 483 static int ibss_rsn_send_auth(struct ibss_rsn *ibss_rsn, const u8 *da, int seq)
 484 {
 485         struct ieee80211_mgmt auth;
 486         const size_t auth_length = IEEE80211_HDRLEN + sizeof(auth.u.auth);
 487         struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
 488
 489         if (wpa_s->driver->send_frame == NULL)
 490                 return -1;
 491
 492         os_memset(&auth, 0, sizeof(auth));
 493
 494         auth.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 495                                           WLAN_FC_STYPE_AUTH);
 496         os_memcpy(auth.da, da, ETH_ALEN);
 497         os_memcpy(auth.sa, wpa_s->own_addr, ETH_ALEN);
 498         os_memcpy(auth.bssid, wpa_s->bssid, ETH_ALEN);
 499
 500         auth.u.auth.auth_alg = host_to_le16(WLAN_AUTH_OPEN);
 501         auth.u.auth.auth_transaction = host_to_le16(seq);
 502         auth.u.auth.status_code = host_to_le16(WLAN_STATUS_SUCCESS);
 503
 504         wpa_printf(MSG_DEBUG, "RSN: IBSS TX Auth frame (SEQ %d) to " MACSTR,
 505                    seq, MAC2STR(da));
 506
 507         return wpa_s->driver->send_frame(wpa_s->drv_priv, (u8 *) &auth,
 508                                          auth_length, 0);
 509 }
 510
 511
 512 static int ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)
 513 {
 514         return peer->authentication_status &
 515                (IBSS_RSN_AUTH_BY_US | IBSS_RSN_AUTH_EAPOL_BY_US);
 516 }
 517
 518
 519 static struct ibss_rsn_peer *
 520 ibss_rsn_peer_init(struct ibss_rsn *ibss_rsn, const u8 *addr)
 521 {
 522         struct ibss_rsn_peer *peer;
 523         if (ibss_rsn == NULL)
 524                 return NULL;
 525
 526         peer = ibss_rsn_get_peer(ibss_rsn, addr);
 527         if (peer) {
 528                 wpa_printf(MSG_DEBUG, "RSN: IBSS Supplicant for peer "MACSTR
 529                            " already running", MAC2STR(addr));
 530                 return peer;
 531         }
 532
 533         wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Supplicant for peer "MACSTR,
 534                    MAC2STR(addr));
 535
 536         peer = os_zalloc(sizeof(*peer));
 537         if (peer == NULL) {
 538                 wpa_printf(MSG_DEBUG, "RSN: Could not allocate memory.");
 539                 return NULL;
 540         }
 541
 542         peer->ibss_rsn = ibss_rsn;
 543         os_memcpy(peer->addr, addr, ETH_ALEN);
 544         peer->authentication_status = IBSS_RSN_AUTH_NOT_AUTHENTICATED;
 545
 546         if (ibss_rsn_supp_init(peer, ibss_rsn->wpa_s->own_addr,
 547                                ibss_rsn->psk) < 0) {
 548                 ibss_rsn_free(peer);
 549                 return NULL;
 550         }
 551
 552         peer->next = ibss_rsn->peers;
 553         ibss_rsn->peers = peer;
 554
 555         return peer;
 556 }
 557
 558
 559 static void ibss_rsn_auth_timeout(void *eloop_ctx, void *timeout_ctx)
 560 {
 561         struct ibss_rsn_peer *peer = eloop_ctx;
 562
 563         /*
 564          * Assume peer does not support Authentication exchange or the frame was
 565          * lost somewhere - start EAPOL Authenticator.
 566          */
 567         wpa_printf(MSG_DEBUG,
 568                    "RSN: Timeout on waiting Authentication frame response from "
 569                    MACSTR " - start authenticator", MAC2STR(peer->addr));
 570
 571         peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
 572         ibss_rsn_auth_init(peer->ibss_rsn, peer);
 573 }
 574
 575
 576 int ibss_rsn_start(struct ibss_rsn *ibss_rsn, const u8 *addr)
 577 {
 578         struct ibss_rsn_peer *peer;
 579         int res;
 580
 581         if (!ibss_rsn)
 582                 return -1;
 583
 584         /* if the peer already exists, exit immediately */
 585         peer = ibss_rsn_get_peer(ibss_rsn, addr);
 586         if (peer)
 587                 return 0;
 588
 589         peer = ibss_rsn_peer_init(ibss_rsn, addr);
 590         if (peer == NULL)
 591                 return -1;
 592
 593         /* Open Authentication: send first Authentication frame */
 594         res = ibss_rsn_send_auth(ibss_rsn, addr, 1);
 595         if (res) {
 596                 /*
 597                  * The driver may not support Authentication frame exchange in
 598                  * IBSS. Ignore authentication and go through EAPOL exchange.
 599                  */
 600                 peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
 601                 return ibss_rsn_auth_init(ibss_rsn, peer);
 602         } else {
 603                 os_get_reltime(&peer->own_auth_tx);
 604                 eloop_register_timeout(1, 0, ibss_rsn_auth_timeout, peer, NULL);
 605         }
 606
 607         return 0;
 608 }
 609
 610
 611 static int ibss_rsn_peer_authenticated(struct ibss_rsn *ibss_rsn,
 612                                        struct ibss_rsn_peer *peer, int reason)
 613 {
 614         int already_started;
 615
 616         if (ibss_rsn == NULL || peer == NULL)
 617                 return -1;
 618
 619         already_started = ibss_rsn_is_auth_started(peer);
 620         peer->authentication_status |= reason;
 621
 622         if (already_started) {
 623                 wpa_printf(MSG_DEBUG, "RSN: IBSS Authenticator already "
 624                            "started for peer " MACSTR, MAC2STR(peer->addr));
 625                 return 0;
 626         }
 627
 628         wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Authenticator "
 629                    "for now-authenticated peer " MACSTR, MAC2STR(peer->addr));
 630
 631         return ibss_rsn_auth_init(ibss_rsn, peer);
 632 }
 633
 634
 635 void ibss_rsn_stop(struct ibss_rsn *ibss_rsn, const u8 *peermac)
 636 {
 637         struct ibss_rsn_peer *peer, *prev;
 638
 639         if (ibss_rsn == NULL)
 640                 return;
 641
 642         if (peermac == NULL) {
 643                 /* remove all peers */
 644                 wpa_printf(MSG_DEBUG, "%s: Remove all peers", __func__);
 645                 peer = ibss_rsn->peers;
 646                 while (peer) {
 647                         prev = peer;
 648                         peer = peer->next;
 649                         ibss_rsn_free(prev);
 650                         ibss_rsn->peers = peer;
 651                 }
 652         } else {
 653                 /* remove specific peer */
 654                 wpa_printf(MSG_DEBUG, "%s: Remove specific peer " MACSTR,
 655                            __func__, MAC2STR(peermac));
 656
 657                 for (prev = NULL, peer = ibss_rsn->peers; peer != NULL;
 658                      prev = peer, peer = peer->next) {
 659                         if (os_memcmp(peermac, peer->addr, ETH_ALEN) == 0) {
 660                                 if (prev == NULL)
 661                                         ibss_rsn->peers = peer->next;
 662                                 else
 663                                         prev->next = peer->next;
 664                                 ibss_rsn_free(peer);
 665                                 wpa_printf(MSG_DEBUG, "%s: Successfully "
 666                                            "removed a specific peer",
 667                                            __func__);
 668                                 break;
 669                         }
 670                 }
 671         }
 672 }
 673
 674
 675 struct ibss_rsn * ibss_rsn_init(struct wpa_supplicant *wpa_s,
 676                                 struct wpa_ssid *ssid)
 677 {
 678         struct ibss_rsn *ibss_rsn;
 679
 680         ibss_rsn = os_zalloc(sizeof(*ibss_rsn));
 681         if (ibss_rsn == NULL)
 682                 return NULL;
 683         ibss_rsn->wpa_s = wpa_s;
 684
 685         if (ibss_rsn_auth_init_group(ibss_rsn, wpa_s->own_addr, ssid) < 0) {
 686                 ibss_rsn_deinit(ibss_rsn);
 687                 return NULL;
 688         }
 689
 690         return ibss_rsn;
 691 }
 692
 693
 694 void ibss_rsn_deinit(struct ibss_rsn *ibss_rsn)
 695 {
 696         struct ibss_rsn_peer *peer, *prev;
 697
 698         if (ibss_rsn == NULL)
 699                 return;
 700
 701         peer = ibss_rsn->peers;
 702         while (peer) {
 703                 prev = peer;
 704                 peer = peer->next;
 705                 ibss_rsn_free(prev);
 706         }
 707
 708         if (ibss_rsn->auth_group)
 709                 wpa_deinit(ibss_rsn->auth_group);
 710         os_free(ibss_rsn);
 711
 712 }
 713
 714
 715 static int ibss_rsn_eapol_dst_supp(const u8 *buf, size_t len)
 716 {
 717         const struct ieee802_1x_hdr *hdr;
 718         const struct wpa_eapol_key *key;
 719         u16 key_info;
 720         size_t plen;
 721
 722         /* TODO: Support other EAPOL packets than just EAPOL-Key */
 723
 724         if (len < sizeof(*hdr) + sizeof(*key))
 725                 return -1;
 726
 727         hdr = (const struct ieee802_1x_hdr *) buf;
 728         key = (const struct wpa_eapol_key *) (hdr + 1);
 729         plen = be_to_host16(hdr->length);
 730
 731         if (hdr->version < EAPOL_VERSION) {
 732                 /* TODO: backwards compatibility */
 733         }
 734         if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
 735                 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame (type %u) discarded, "
 736                         "not a Key frame", hdr->type);
 737                 return -1;
 738         }
 739         if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
 740                 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame payload size %lu "
 741                            "invalid (frame size %lu)",
 742                            (unsigned long) plen, (unsigned long) len);
 743                 return -1;
 744         }
 745
 746         if (key->type != EAPOL_KEY_TYPE_RSN) {
 747                 wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key type (%d) unknown, "
 748                            "discarded", key->type);
 749                 return -1;
 750         }
 751
 752         key_info = WPA_GET_BE16(key->key_info);
 753
 754         return !!(key_info & WPA_KEY_INFO_ACK);
 755 }
 756
 757
 758 static int ibss_rsn_process_rx_eapol(struct ibss_rsn *ibss_rsn,
 759                                      struct ibss_rsn_peer *peer,
 760                                      const u8 *buf, size_t len)
 761 {
 762         int supp;
 763         u8 *tmp;
 764
 765         supp = ibss_rsn_eapol_dst_supp(buf, len);
 766         if (supp < 0)
 767                 return -1;
 768
 769         tmp = os_memdup(buf, len);
 770         if (tmp == NULL)
 771                 return -1;
 772         if (supp) {
 773                 peer->authentication_status |= IBSS_RSN_AUTH_EAPOL_BY_PEER;
 774                 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Supplicant from "
 775                            MACSTR, MAC2STR(peer->addr));
 776                 wpa_sm_rx_eapol(peer->supp, peer->addr, tmp, len);
 777         } else {
 778                 if (ibss_rsn_is_auth_started(peer) == 0) {
 779                         wpa_printf(MSG_DEBUG, "RSN: IBSS EAPOL for "
 780                                    "Authenticator dropped as " MACSTR " is not "
 781                                    "authenticated", MAC2STR(peer->addr));
 782                         os_free(tmp);
 783                         return -1;
 784                 }
 785
 786                 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Authenticator "
 787                            "from "MACSTR, MAC2STR(peer->addr));
 788                 wpa_receive(ibss_rsn->auth_group, peer->auth, tmp, len);
 789         }
 790         os_free(tmp);
 791
 792         return 1;
 793 }
 794
 795
 796 int ibss_rsn_rx_eapol(struct ibss_rsn *ibss_rsn, const u8 *src_addr,
 797                       const u8 *buf, size_t len)
 798 {
 799         struct ibss_rsn_peer *peer;
 800
 801         if (ibss_rsn == NULL)
 802                 return -1;
 803
 804         peer = ibss_rsn_get_peer(ibss_rsn, src_addr);
 805         if (peer)
 806                 return ibss_rsn_process_rx_eapol(ibss_rsn, peer, buf, len);
 807
 808         if (ibss_rsn_eapol_dst_supp(buf, len) > 0) {
 809                 /*
 810                  * Create new IBSS peer based on an EAPOL message from the peer
 811                  * Authenticator.
 812                  */
 813                 peer = ibss_rsn_peer_init(ibss_rsn, src_addr);
 814                 if (peer == NULL)
 815                         return -1;
 816
 817                 /* assume the peer is authenticated already */
 818                 wpa_printf(MSG_DEBUG, "RSN: IBSS Not using IBSS Auth for peer "
 819                            MACSTR, MAC2STR(src_addr));
 820                 ibss_rsn_peer_authenticated(ibss_rsn, peer,
 821                                             IBSS_RSN_AUTH_EAPOL_BY_US);
 822
 823                 return ibss_rsn_process_rx_eapol(ibss_rsn, ibss_rsn->peers,
 824                                                  buf, len);
 825         }
 826
 827         return 0;
 828 }
 829
 830 void ibss_rsn_set_psk(struct ibss_rsn *ibss_rsn, const u8 *psk)
 831 {
 832         if (ibss_rsn == NULL)
 833                 return;
 834         os_memcpy(ibss_rsn->psk, psk, PMK_LEN);
 835 }
 836
 837
 838 static void ibss_rsn_handle_auth_1_of_2(struct ibss_rsn *ibss_rsn,
 839                                         struct ibss_rsn_peer *peer,
 840                                         const u8* addr)
 841 {
 842         wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 1) from " MACSTR,
 843                    MAC2STR(addr));
 844
 845         if (peer &&
 846             peer->authentication_status & (IBSS_RSN_SET_PTK_SUPP |
 847                                            IBSS_RSN_SET_PTK_AUTH)) {
 848                 /* Clear the TK for this pair to allow recovery from the case
 849                  * where the peer STA has restarted and lost its key while we
 850                  * still have a pairwise key configured. */
 851                 wpa_printf(MSG_DEBUG, "RSN: Clear pairwise key for peer "
 852                            MACSTR, MAC2STR(addr));
 853                 wpa_drv_set_key(ibss_rsn->wpa_s, WPA_ALG_NONE, addr, 0, 0,
 854                                 NULL, 0, NULL, 0);
 855         }
 856
 857         if (peer &&
 858             peer->authentication_status & IBSS_RSN_AUTH_EAPOL_BY_PEER) {
 859                 if (peer->own_auth_tx.sec) {
 860                         struct os_reltime now, diff;
 861                         os_get_reltime(&now);
 862                         os_reltime_sub(&now, &peer->own_auth_tx, &diff);
 863                         if (diff.sec == 0 && diff.usec < 500000) {
 864                                 wpa_printf(MSG_DEBUG, "RSN: Skip IBSS reinit since only %u usec from own Auth frame TX",
 865                                            (int) diff.usec);
 866                                 goto skip_reinit;
 867                         }
 868                 }
 869                 /*
 870                  * A peer sent us an Authentication frame even though it already
 871                  * started an EAPOL session. We should reinit state machines
 872                  * here, but it's much more complicated than just deleting and
 873                  * recreating the state machine
 874                  */
 875                 wpa_printf(MSG_DEBUG, "RSN: IBSS Reinitializing station "
 876                            MACSTR, MAC2STR(addr));
 877
 878                 ibss_rsn_stop(ibss_rsn, addr);
 879                 peer = NULL;
 880         }
 881
 882         if (!peer) {
 883                 peer = ibss_rsn_peer_init(ibss_rsn, addr);
 884                 if (!peer)
 885                         return;
 886
 887                 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth started by peer " MACSTR,
 888                            MAC2STR(addr));
 889         }
 890
 891 skip_reinit:
 892         /* reply with an Authentication frame now, before sending an EAPOL */
 893         ibss_rsn_send_auth(ibss_rsn, addr, 2);
 894         /* no need to start another AUTH challenge in the other way.. */
 895         ibss_rsn_peer_authenticated(ibss_rsn, peer, IBSS_RSN_AUTH_EAPOL_BY_US);
 896 }
 897
 898
 899 void ibss_rsn_handle_auth(struct ibss_rsn *ibss_rsn, const u8 *auth_frame,
 900                           size_t len)
 901 {
 902         const struct ieee80211_mgmt *header;
 903         struct ibss_rsn_peer *peer;
 904         size_t auth_length;
 905
 906         header = (const struct ieee80211_mgmt *) auth_frame;
 907         auth_length = IEEE80211_HDRLEN + sizeof(header->u.auth);
 908
 909         if (ibss_rsn == NULL || len < auth_length)
 910                 return;
 911
 912         if (le_to_host16(header->u.auth.auth_alg) != WLAN_AUTH_OPEN ||
 913             le_to_host16(header->u.auth.status_code) != WLAN_STATUS_SUCCESS)
 914                 return;
 915
 916         peer = ibss_rsn_get_peer(ibss_rsn, header->sa);
 917
 918         switch (le_to_host16(header->u.auth.auth_transaction)) {
 919         case 1:
 920                 ibss_rsn_handle_auth_1_of_2(ibss_rsn, peer, header->sa);
 921                 break;
 922         case 2:
 923                 wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 2) from "
 924                            MACSTR, MAC2STR(header->sa));
 925                 if (!peer) {
 926                         wpa_printf(MSG_DEBUG, "RSN: Received Auth seq 2 from "
 927                                    "unknown STA " MACSTR, MAC2STR(header->sa));
 928                         break;
 929                 }
 930
 931                 /* authentication has been completed */
 932                 eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL);
 933                 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth completed with " MACSTR,
 934                            MAC2STR(header->sa));
 935                 ibss_rsn_peer_authenticated(ibss_rsn, peer,
 936                                             IBSS_RSN_AUTH_BY_US);
 937                 break;
 938         }
 939 }