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         int encrypt = peer->authentication_status & IBSS_RSN_REPORTED_PTK;
  68
  69         wpa_printf(MSG_DEBUG, "SUPP: %s(dest=" MACSTR
  70                    " proto=0x%04x len=%lu no_encrypt=%d)",
  71                    __func__, MAC2STR(dest), proto, (unsigned long) len,
  72                    !encrypt);
  73
  74         if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_CONTROL_PORT)
  75                 return wpa_drv_tx_control_port(wpa_s, dest, proto, buf, len,
  76                                                !encrypt);
  77
  78         if (wpa_s->l2)
  79                 return l2_packet_send(wpa_s->l2, dest, proto, buf, len);
  80
  81         return -1;
  82 }
  83
  84
  85 static u8 * supp_alloc_eapol(void *ctx, u8 type, const void *data,
  86                              u16 data_len, size_t *msg_len, void **data_pos)
  87 {
  88         struct ieee802_1x_hdr *hdr;
  89
  90         wpa_printf(MSG_DEBUG, "SUPP: %s(type=%d data_len=%d)",
  91                    __func__, type, data_len);
  92
  93         *msg_len = sizeof(*hdr) + data_len;
  94         hdr = os_malloc(*msg_len);
  95         if (hdr == NULL)
  96                 return NULL;
  97
  98         hdr->version = 2;
  99         hdr->type = type;
 100         hdr->length = host_to_be16(data_len);
 101
 102         if (data)
 103                 os_memcpy(hdr + 1, data, data_len);
 104         else
 105                 os_memset(hdr + 1, 0, data_len);
 106
 107         if (data_pos)
 108                 *data_pos = hdr + 1;
 109
 110         return (u8 *) hdr;
 111 }
 112
 113
 114 static int supp_get_beacon_ie(void *ctx)
 115 {
 116         struct ibss_rsn_peer *peer = ctx;
 117
 118         wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
 119         /* TODO: get correct RSN IE */
 120         wpa_sm_set_ap_rsnxe(peer->supp, NULL, 0);
 121         return wpa_sm_set_ap_rsn_ie(peer->supp,
 122                                     (u8 *) "\x30\x14\x01\x00"
 123                                     "\x00\x0f\xac\x04"
 124                                     "\x01\x00\x00\x0f\xac\x04"
 125                                     "\x01\x00\x00\x0f\xac\x02"
 126                                     "\x00\x00", 22);
 127 }
 128
 129
 130 static void ibss_check_rsn_completed(struct ibss_rsn_peer *peer)
 131 {
 132         struct wpa_supplicant *wpa_s = peer->ibss_rsn->wpa_s;
 133
 134         if ((peer->authentication_status &
 135              (IBSS_RSN_SET_PTK_SUPP | IBSS_RSN_SET_PTK_AUTH)) !=
 136             (IBSS_RSN_SET_PTK_SUPP | IBSS_RSN_SET_PTK_AUTH))
 137                 return;
 138         if (peer->authentication_status & IBSS_RSN_REPORTED_PTK)
 139                 return;
 140         peer->authentication_status |= IBSS_RSN_REPORTED_PTK;
 141         wpa_msg(wpa_s, MSG_INFO, IBSS_RSN_COMPLETED MACSTR,
 142                 MAC2STR(peer->addr));
 143 }
 144
 145
 146 static int supp_set_key(void *ctx, enum wpa_alg alg,
 147                         const u8 *addr, int key_idx, int set_tx,
 148                         const u8 *seq, size_t seq_len,
 149                         const u8 *key, size_t key_len, enum key_flag key_flag)
 150 {
 151         struct ibss_rsn_peer *peer = ctx;
 152
 153         wpa_printf(MSG_DEBUG, "SUPP: %s(alg=%d addr=" MACSTR " key_idx=%d "
 154                    "set_tx=%d)",
 155                    __func__, alg, MAC2STR(addr), key_idx, set_tx);
 156         wpa_hexdump(MSG_DEBUG, "SUPP: set_key - seq", seq, seq_len);
 157         wpa_hexdump_key(MSG_DEBUG, "SUPP: set_key - key", key, key_len);
 158
 159         if (key_idx == 0) {
 160                 peer->authentication_status |= IBSS_RSN_SET_PTK_SUPP;
 161                 ibss_check_rsn_completed(peer);
 162                 /*
 163                  * In IBSS RSN, the pairwise key from the 4-way handshake
 164                  * initiated by the peer with highest MAC address is used.
 165                  */
 166                 if (os_memcmp(peer->ibss_rsn->wpa_s->own_addr, peer->addr,
 167                               ETH_ALEN) > 0) {
 168                         wpa_printf(MSG_DEBUG, "SUPP: Do not use this PTK");
 169                         return 0;
 170                 }
 171         }
 172
 173         if (is_broadcast_ether_addr(addr))
 174                 addr = peer->addr;
 175         return wpa_drv_set_key(peer->ibss_rsn->wpa_s, alg, addr, key_idx,
 176                                set_tx, seq, seq_len, key, key_len, key_flag);
 177 }
 178
 179
 180 static void * supp_get_network_ctx(void *ctx)
 181 {
 182         struct ibss_rsn_peer *peer = ctx;
 183         return wpa_supplicant_get_ssid(peer->ibss_rsn->wpa_s);
 184 }
 185
 186
 187 static int supp_mlme_setprotection(void *ctx, const u8 *addr,
 188                                    int protection_type, int key_type)
 189 {
 190         wpa_printf(MSG_DEBUG, "SUPP: %s(addr=" MACSTR " protection_type=%d "
 191                    "key_type=%d)",
 192                    __func__, MAC2STR(addr), protection_type, key_type);
 193         return 0;
 194 }
 195
 196
 197 static void supp_cancel_auth_timeout(void *ctx)
 198 {
 199         wpa_printf(MSG_DEBUG, "SUPP: %s", __func__);
 200 }
 201
 202
 203 static void supp_deauthenticate(void *ctx, u16 reason_code)
 204 {
 205         wpa_printf(MSG_DEBUG, "SUPP: %s (TODO)", __func__);
 206 }
 207
 208
 209 static void supp_reconnect(void *ctx)
 210 {
 211         wpa_printf(MSG_DEBUG, "SUPP: %s (TODO)", __func__);
 212 }
 213
 214
 215 static int ibss_rsn_supp_init(struct ibss_rsn_peer *peer, const u8 *own_addr,
 216                               const u8 *psk)
 217 {
 218         struct wpa_sm_ctx *ctx = os_zalloc(sizeof(*ctx));
 219         if (ctx == NULL)
 220                 return -1;
 221
 222         ctx->ctx = peer;
 223         ctx->msg_ctx = peer->ibss_rsn->wpa_s;
 224         ctx->set_state = supp_set_state;
 225         ctx->get_state = supp_get_state;
 226         ctx->ether_send = supp_ether_send;
 227         ctx->get_beacon_ie = supp_get_beacon_ie;
 228         ctx->alloc_eapol = supp_alloc_eapol;
 229         ctx->set_key = supp_set_key;
 230         ctx->get_network_ctx = supp_get_network_ctx;
 231         ctx->mlme_setprotection = supp_mlme_setprotection;
 232         ctx->cancel_auth_timeout = supp_cancel_auth_timeout;
 233         ctx->deauthenticate = supp_deauthenticate;
 234         ctx->reconnect = supp_reconnect;
 235         peer->supp = wpa_sm_init(ctx);
 236         if (peer->supp == NULL) {
 237                 wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_init() failed");
 238                 os_free(ctx);
 239                 return -1;
 240         }
 241
 242         wpa_sm_set_own_addr(peer->supp, own_addr);
 243         wpa_sm_set_param(peer->supp, WPA_PARAM_RSN_ENABLED, 1);
 244         wpa_sm_set_param(peer->supp, WPA_PARAM_PROTO, WPA_PROTO_RSN);
 245         wpa_sm_set_param(peer->supp, WPA_PARAM_PAIRWISE, WPA_CIPHER_CCMP);
 246         wpa_sm_set_param(peer->supp, WPA_PARAM_GROUP, WPA_CIPHER_CCMP);
 247         wpa_sm_set_param(peer->supp, WPA_PARAM_KEY_MGMT, WPA_KEY_MGMT_PSK);
 248         wpa_sm_set_pmk(peer->supp, psk, PMK_LEN, NULL, NULL);
 249
 250         peer->supp_ie_len = sizeof(peer->supp_ie);
 251         if (wpa_sm_set_assoc_wpa_ie_default(peer->supp, peer->supp_ie,
 252                                             &peer->supp_ie_len) < 0) {
 253                 wpa_printf(MSG_DEBUG, "SUPP: wpa_sm_set_assoc_wpa_ie_default()"
 254                            " failed");
 255                 return -1;
 256         }
 257
 258         wpa_sm_notify_assoc(peer->supp, peer->addr);
 259
 260         return 0;
 261 }
 262
 263
 264 static void auth_logger(void *ctx, const u8 *addr, logger_level level,
 265                         const char *txt)
 266 {
 267         if (addr)
 268                 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " - %s",
 269                            MAC2STR(addr), txt);
 270         else
 271                 wpa_printf(MSG_DEBUG, "AUTH: %s", txt);
 272 }
 273
 274
 275 static const u8 * auth_get_psk(void *ctx, const u8 *addr,
 276                                const u8 *p2p_dev_addr, const u8 *prev_psk,
 277                                size_t *psk_len, int *vlan_id)
 278 {
 279         struct ibss_rsn *ibss_rsn = ctx;
 280
 281         if (psk_len)
 282                 *psk_len = PMK_LEN;
 283         if (vlan_id)
 284                 *vlan_id = 0;
 285         wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",
 286                    __func__, MAC2STR(addr), prev_psk);
 287         if (prev_psk)
 288                 return NULL;
 289         return ibss_rsn->psk;
 290 }
 291
 292
 293 static int auth_send_eapol(void *ctx, const u8 *addr, const u8 *data,
 294                            size_t data_len, int encrypt)
 295 {
 296         struct ibss_rsn *ibss_rsn = ctx;
 297         struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
 298
 299         wpa_printf(MSG_DEBUG, "AUTH: %s(addr=" MACSTR " data_len=%lu "
 300                    "encrypt=%d)",
 301                    __func__, MAC2STR(addr), (unsigned long) data_len, encrypt);
 302
 303         if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_CONTROL_PORT)
 304                 return wpa_drv_tx_control_port(wpa_s, addr, ETH_P_EAPOL,
 305                                                data, data_len, !encrypt);
 306
 307         if (wpa_s->l2)
 308                 return l2_packet_send(wpa_s->l2, addr, ETH_P_EAPOL, data,
 309                                       data_len);
 310
 311         return -1;
 312 }
 313
 314
 315 static int auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
 316                         const u8 *addr, int idx, u8 *key, size_t key_len,
 317                         enum key_flag key_flag)
 318 {
 319         struct ibss_rsn *ibss_rsn = ctx;
 320         u8 seq[6];
 321
 322         os_memset(seq, 0, sizeof(seq));
 323
 324         if (addr) {
 325                 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d addr=" MACSTR
 326                            " key_idx=%d)",
 327                            __func__, alg, MAC2STR(addr), idx);
 328         } else {
 329                 wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d key_idx=%d)",
 330                            __func__, alg, idx);
 331         }
 332         wpa_hexdump_key(MSG_DEBUG, "AUTH: set_key - key", key, key_len);
 333
 334         if (idx == 0) {
 335                 if (addr) {
 336                         struct ibss_rsn_peer *peer;
 337                         peer = ibss_rsn_get_peer(ibss_rsn, addr);
 338                         if (peer) {
 339                                 peer->authentication_status |=
 340                                         IBSS_RSN_SET_PTK_AUTH;
 341                                 ibss_check_rsn_completed(peer);
 342                         }
 343                 }
 344                 /*
 345                  * In IBSS RSN, the pairwise key from the 4-way handshake
 346                  * initiated by the peer with highest MAC address is used.
 347                  */
 348                 if (addr == NULL ||
 349                     os_memcmp(ibss_rsn->wpa_s->own_addr, addr, ETH_ALEN) < 0) {
 350                         wpa_printf(MSG_DEBUG, "AUTH: Do not use this PTK");
 351                         return 0;
 352                 }
 353         }
 354
 355         return wpa_drv_set_key(ibss_rsn->wpa_s, alg, addr, idx,
 356                                1, seq, 6, key, key_len, key_flag);
 357 }
 358
 359
 360 static void ibss_rsn_disconnect(void *ctx, const u8 *addr, u16 reason)
 361 {
 362         struct ibss_rsn *ibss_rsn = ctx;
 363         wpa_drv_sta_deauth(ibss_rsn->wpa_s, addr, reason);
 364 }
 365
 366
 367 static int auth_for_each_sta(void *ctx, int (*cb)(struct wpa_state_machine *sm,
 368                                                   void *ctx),
 369                              void *cb_ctx)
 370 {
 371         struct ibss_rsn *ibss_rsn = ctx;
 372         struct ibss_rsn_peer *peer;
 373
 374         wpa_printf(MSG_DEBUG, "AUTH: for_each_sta");
 375
 376         for (peer = ibss_rsn->peers; peer; peer = peer->next) {
 377                 if (peer->auth && cb(peer->auth, cb_ctx))
 378                         return 1;
 379         }
 380
 381         return 0;
 382 }
 383
 384
 385 static void ibss_set_sta_authorized(struct ibss_rsn *ibss_rsn,
 386                                     struct ibss_rsn_peer *peer, int authorized)
 387 {
 388         int res;
 389
 390         if (authorized) {
 391                 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
 392                                             WPA_STA_AUTHORIZED,
 393                                             WPA_STA_AUTHORIZED, ~0);
 394                 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " authorizing port",
 395                            MAC2STR(peer->addr));
 396         } else {
 397                 res = wpa_drv_sta_set_flags(ibss_rsn->wpa_s, peer->addr,
 398                                             0, 0, ~WPA_STA_AUTHORIZED);
 399                 wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " unauthorizing port",
 400                            MAC2STR(peer->addr));
 401         }
 402
 403         if (res && errno != ENOENT) {
 404                 wpa_printf(MSG_DEBUG, "Could not set station " MACSTR " flags "
 405                            "for kernel driver (errno=%d)",
 406                            MAC2STR(peer->addr), errno);
 407         }
 408 }
 409
 410
 411 static void auth_set_eapol(void *ctx, const u8 *addr,
 412                                        wpa_eapol_variable var, int value)
 413 {
 414         struct ibss_rsn *ibss_rsn = ctx;
 415         struct ibss_rsn_peer *peer = ibss_rsn_get_peer(ibss_rsn, addr);
 416
 417         if (peer == NULL)
 418                 return;
 419
 420         switch (var) {
 421         case WPA_EAPOL_authorized:
 422                 ibss_set_sta_authorized(ibss_rsn, peer, value);
 423                 break;
 424         default:
 425                 /* do not handle any other event */
 426                 wpa_printf(MSG_DEBUG, "AUTH: eapol event not handled %d", var);
 427                 break;
 428         }
 429 }
 430
 431
 432 static int ibss_rsn_auth_init_group(struct ibss_rsn *ibss_rsn,
 433                                     const u8 *own_addr, struct wpa_ssid *ssid)
 434 {
 435         struct wpa_auth_config conf;
 436         static const struct wpa_auth_callbacks cb = {
 437                 .logger = auth_logger,
 438                 .set_eapol = auth_set_eapol,
 439                 .send_eapol = auth_send_eapol,
 440                 .get_psk = auth_get_psk,
 441                 .set_key = auth_set_key,
 442                 .for_each_sta = auth_for_each_sta,
 443                 .disconnect = ibss_rsn_disconnect,
 444         };
 445
 446         wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
 447
 448         os_memset(&conf, 0, sizeof(conf));
 449         conf.wpa = 2;
 450         conf.wpa_key_mgmt = WPA_KEY_MGMT_PSK;
 451         conf.wpa_pairwise = WPA_CIPHER_CCMP;
 452         conf.rsn_pairwise = WPA_CIPHER_CCMP;
 453         conf.wpa_group = WPA_CIPHER_CCMP;
 454         conf.eapol_version = 2;
 455         conf.wpa_group_rekey = ssid->group_rekey ? ssid->group_rekey : 600;
 456         conf.wpa_group_update_count = 4;
 457         conf.wpa_pairwise_update_count = 4;
 458
 459         ibss_rsn->auth_group = wpa_init(own_addr, &conf, &cb, ibss_rsn);
 460         if (ibss_rsn->auth_group == NULL) {
 461                 wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
 462                 return -1;
 463         }
 464
 465         wpa_init_keys(ibss_rsn->auth_group);
 466
 467         return 0;
 468 }
 469
 470
 471 static int ibss_rsn_auth_init(struct ibss_rsn *ibss_rsn,
 472                               struct ibss_rsn_peer *peer)
 473 {
 474         peer->auth = wpa_auth_sta_init(ibss_rsn->auth_group, peer->addr, NULL);
 475         if (peer->auth == NULL) {
 476                 wpa_printf(MSG_DEBUG, "AUTH: wpa_auth_sta_init() failed");
 477                 return -1;
 478         }
 479
 480         /* TODO: get peer RSN IE with Probe Request */
 481         if (wpa_validate_wpa_ie(ibss_rsn->auth_group, peer->auth, 0,
 482                                 (u8 *) "\x30\x14\x01\x00"
 483                                 "\x00\x0f\xac\x04"
 484                                 "\x01\x00\x00\x0f\xac\x04"
 485                                 "\x01\x00\x00\x0f\xac\x02"
 486                                 "\x00\x00", 22, NULL, 0, NULL, 0, NULL, 0) !=
 487             WPA_IE_OK) {
 488                 wpa_printf(MSG_DEBUG, "AUTH: wpa_validate_wpa_ie() failed");
 489                 return -1;
 490         }
 491
 492         if (wpa_auth_sm_event(peer->auth, WPA_ASSOC))
 493                 return -1;
 494
 495         if (wpa_auth_sta_associated(ibss_rsn->auth_group, peer->auth))
 496                 return -1;
 497
 498         return 0;
 499 }
 500
 501
 502 static int ibss_rsn_send_auth(struct ibss_rsn *ibss_rsn, const u8 *da, int seq)
 503 {
 504         struct ieee80211_mgmt auth;
 505         const size_t auth_length = IEEE80211_HDRLEN + sizeof(auth.u.auth);
 506         struct wpa_supplicant *wpa_s = ibss_rsn->wpa_s;
 507
 508         os_memset(&auth, 0, sizeof(auth));
 509
 510         auth.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 511                                           WLAN_FC_STYPE_AUTH);
 512         os_memcpy(auth.da, da, ETH_ALEN);
 513         os_memcpy(auth.sa, wpa_s->own_addr, ETH_ALEN);
 514         os_memcpy(auth.bssid, wpa_s->bssid, ETH_ALEN);
 515
 516         auth.u.auth.auth_alg = host_to_le16(WLAN_AUTH_OPEN);
 517         auth.u.auth.auth_transaction = host_to_le16(seq);
 518         auth.u.auth.status_code = host_to_le16(WLAN_STATUS_SUCCESS);
 519
 520         wpa_printf(MSG_DEBUG, "RSN: IBSS TX Auth frame (SEQ %d) to " MACSTR,
 521                    seq, MAC2STR(da));
 522
 523         return wpa_drv_send_mlme(wpa_s, (u8 *) &auth, auth_length, 0, 0);
 524 }
 525
 526
 527 static int ibss_rsn_is_auth_started(struct ibss_rsn_peer * peer)
 528 {
 529         return peer->authentication_status &
 530                (IBSS_RSN_AUTH_BY_US | IBSS_RSN_AUTH_EAPOL_BY_US);
 531 }
 532
 533
 534 static struct ibss_rsn_peer *
 535 ibss_rsn_peer_init(struct ibss_rsn *ibss_rsn, const u8 *addr)
 536 {
 537         struct ibss_rsn_peer *peer;
 538         if (ibss_rsn == NULL)
 539                 return NULL;
 540
 541         peer = ibss_rsn_get_peer(ibss_rsn, addr);
 542         if (peer) {
 543                 wpa_printf(MSG_DEBUG, "RSN: IBSS Supplicant for peer "MACSTR
 544                            " already running", MAC2STR(addr));
 545                 return peer;
 546         }
 547
 548         wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Supplicant for peer "MACSTR,
 549                    MAC2STR(addr));
 550
 551         peer = os_zalloc(sizeof(*peer));
 552         if (peer == NULL) {
 553                 wpa_printf(MSG_DEBUG, "RSN: Could not allocate memory.");
 554                 return NULL;
 555         }
 556
 557         peer->ibss_rsn = ibss_rsn;
 558         os_memcpy(peer->addr, addr, ETH_ALEN);
 559         peer->authentication_status = IBSS_RSN_AUTH_NOT_AUTHENTICATED;
 560
 561         if (ibss_rsn_supp_init(peer, ibss_rsn->wpa_s->own_addr,
 562                                ibss_rsn->psk) < 0) {
 563                 ibss_rsn_free(peer);
 564                 return NULL;
 565         }
 566
 567         peer->next = ibss_rsn->peers;
 568         ibss_rsn->peers = peer;
 569
 570         return peer;
 571 }
 572
 573
 574 static void ibss_rsn_auth_timeout(void *eloop_ctx, void *timeout_ctx)
 575 {
 576         struct ibss_rsn_peer *peer = eloop_ctx;
 577
 578         /*
 579          * Assume peer does not support Authentication exchange or the frame was
 580          * lost somewhere - start EAPOL Authenticator.
 581          */
 582         wpa_printf(MSG_DEBUG,
 583                    "RSN: Timeout on waiting Authentication frame response from "
 584                    MACSTR " - start authenticator", MAC2STR(peer->addr));
 585
 586         peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
 587         ibss_rsn_auth_init(peer->ibss_rsn, peer);
 588 }
 589
 590
 591 int ibss_rsn_start(struct ibss_rsn *ibss_rsn, const u8 *addr)
 592 {
 593         struct ibss_rsn_peer *peer;
 594         int res;
 595
 596         if (!ibss_rsn)
 597                 return -1;
 598
 599         /* if the peer already exists, exit immediately */
 600         peer = ibss_rsn_get_peer(ibss_rsn, addr);
 601         if (peer)
 602                 return 0;
 603
 604         peer = ibss_rsn_peer_init(ibss_rsn, addr);
 605         if (peer == NULL)
 606                 return -1;
 607
 608         /* Open Authentication: send first Authentication frame */
 609         res = ibss_rsn_send_auth(ibss_rsn, addr, 1);
 610         if (res) {
 611                 /*
 612                  * The driver may not support Authentication frame exchange in
 613                  * IBSS. Ignore authentication and go through EAPOL exchange.
 614                  */
 615                 peer->authentication_status |= IBSS_RSN_AUTH_BY_US;
 616                 return ibss_rsn_auth_init(ibss_rsn, peer);
 617         } else {
 618                 os_get_reltime(&peer->own_auth_tx);
 619                 eloop_register_timeout(1, 0, ibss_rsn_auth_timeout, peer, NULL);
 620         }
 621
 622         return 0;
 623 }
 624
 625
 626 static int ibss_rsn_peer_authenticated(struct ibss_rsn *ibss_rsn,
 627                                        struct ibss_rsn_peer *peer, int reason)
 628 {
 629         int already_started;
 630
 631         if (ibss_rsn == NULL || peer == NULL)
 632                 return -1;
 633
 634         already_started = ibss_rsn_is_auth_started(peer);
 635         peer->authentication_status |= reason;
 636
 637         if (already_started) {
 638                 wpa_printf(MSG_DEBUG, "RSN: IBSS Authenticator already "
 639                            "started for peer " MACSTR, MAC2STR(peer->addr));
 640                 return 0;
 641         }
 642
 643         wpa_printf(MSG_DEBUG, "RSN: Starting IBSS Authenticator "
 644                    "for now-authenticated peer " MACSTR, MAC2STR(peer->addr));
 645
 646         return ibss_rsn_auth_init(ibss_rsn, peer);
 647 }
 648
 649
 650 void ibss_rsn_stop(struct ibss_rsn *ibss_rsn, const u8 *peermac)
 651 {
 652         struct ibss_rsn_peer *peer, *prev;
 653
 654         if (ibss_rsn == NULL)
 655                 return;
 656
 657         if (peermac == NULL) {
 658                 /* remove all peers */
 659                 wpa_printf(MSG_DEBUG, "%s: Remove all peers", __func__);
 660                 peer = ibss_rsn->peers;
 661                 while (peer) {
 662                         prev = peer;
 663                         peer = peer->next;
 664                         ibss_rsn_free(prev);
 665                         ibss_rsn->peers = peer;
 666                 }
 667         } else {
 668                 /* remove specific peer */
 669                 wpa_printf(MSG_DEBUG, "%s: Remove specific peer " MACSTR,
 670                            __func__, MAC2STR(peermac));
 671
 672                 for (prev = NULL, peer = ibss_rsn->peers; peer != NULL;
 673                      prev = peer, peer = peer->next) {
 674                         if (os_memcmp(peermac, peer->addr, ETH_ALEN) == 0) {
 675                                 if (prev == NULL)
 676                                         ibss_rsn->peers = peer->next;
 677                                 else
 678                                         prev->next = peer->next;
 679                                 ibss_rsn_free(peer);
 680                                 wpa_printf(MSG_DEBUG, "%s: Successfully "
 681                                            "removed a specific peer",
 682                                            __func__);
 683                                 break;
 684                         }
 685                 }
 686         }
 687 }
 688
 689
 690 struct ibss_rsn * ibss_rsn_init(struct wpa_supplicant *wpa_s,
 691                                 struct wpa_ssid *ssid)
 692 {
 693         struct ibss_rsn *ibss_rsn;
 694
 695         ibss_rsn = os_zalloc(sizeof(*ibss_rsn));
 696         if (ibss_rsn == NULL)
 697                 return NULL;
 698         ibss_rsn->wpa_s = wpa_s;
 699
 700         if (ibss_rsn_auth_init_group(ibss_rsn, wpa_s->own_addr, ssid) < 0) {
 701                 ibss_rsn_deinit(ibss_rsn);
 702                 return NULL;
 703         }
 704
 705         return ibss_rsn;
 706 }
 707
 708
 709 void ibss_rsn_deinit(struct ibss_rsn *ibss_rsn)
 710 {
 711         struct ibss_rsn_peer *peer, *prev;
 712
 713         if (ibss_rsn == NULL)
 714                 return;
 715
 716         peer = ibss_rsn->peers;
 717         while (peer) {
 718                 prev = peer;
 719                 peer = peer->next;
 720                 ibss_rsn_free(prev);
 721         }
 722
 723         if (ibss_rsn->auth_group)
 724                 wpa_deinit(ibss_rsn->auth_group);
 725         os_free(ibss_rsn);
 726
 727 }
 728
 729
 730 static int ibss_rsn_eapol_dst_supp(const u8 *buf, size_t len)
 731 {
 732         const struct ieee802_1x_hdr *hdr;
 733         const struct wpa_eapol_key *key;
 734         u16 key_info;
 735         size_t plen;
 736
 737         /* TODO: Support other EAPOL packets than just EAPOL-Key */
 738
 739         if (len < sizeof(*hdr) + sizeof(*key))
 740                 return -1;
 741
 742         hdr = (const struct ieee802_1x_hdr *) buf;
 743         key = (const struct wpa_eapol_key *) (hdr + 1);
 744         plen = be_to_host16(hdr->length);
 745
 746         if (hdr->version < EAPOL_VERSION) {
 747                 /* TODO: backwards compatibility */
 748         }
 749         if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
 750                 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame (type %u) discarded, "
 751                         "not a Key frame", hdr->type);
 752                 return -1;
 753         }
 754         if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
 755                 wpa_printf(MSG_DEBUG, "RSN: EAPOL frame payload size %lu "
 756                            "invalid (frame size %lu)",
 757                            (unsigned long) plen, (unsigned long) len);
 758                 return -1;
 759         }
 760
 761         if (key->type != EAPOL_KEY_TYPE_RSN) {
 762                 wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key type (%d) unknown, "
 763                            "discarded", key->type);
 764                 return -1;
 765         }
 766
 767         key_info = WPA_GET_BE16(key->key_info);
 768
 769         return !!(key_info & WPA_KEY_INFO_ACK);
 770 }
 771
 772
 773 static int ibss_rsn_process_rx_eapol(struct ibss_rsn *ibss_rsn,
 774                                      struct ibss_rsn_peer *peer,
 775                                      const u8 *buf, size_t len)
 776 {
 777         int supp;
 778         u8 *tmp;
 779
 780         supp = ibss_rsn_eapol_dst_supp(buf, len);
 781         if (supp < 0)
 782                 return -1;
 783
 784         tmp = os_memdup(buf, len);
 785         if (tmp == NULL)
 786                 return -1;
 787         if (supp) {
 788                 peer->authentication_status |= IBSS_RSN_AUTH_EAPOL_BY_PEER;
 789                 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Supplicant from "
 790                            MACSTR, MAC2STR(peer->addr));
 791                 wpa_sm_rx_eapol(peer->supp, peer->addr, tmp, len);
 792         } else {
 793                 if (ibss_rsn_is_auth_started(peer) == 0) {
 794                         wpa_printf(MSG_DEBUG, "RSN: IBSS EAPOL for "
 795                                    "Authenticator dropped as " MACSTR " is not "
 796                                    "authenticated", MAC2STR(peer->addr));
 797                         os_free(tmp);
 798                         return -1;
 799                 }
 800
 801                 wpa_printf(MSG_DEBUG, "RSN: IBSS RX EAPOL for Authenticator "
 802                            "from "MACSTR, MAC2STR(peer->addr));
 803                 wpa_receive(ibss_rsn->auth_group, peer->auth, tmp, len);
 804         }
 805         os_free(tmp);
 806
 807         return 1;
 808 }
 809
 810
 811 int ibss_rsn_rx_eapol(struct ibss_rsn *ibss_rsn, const u8 *src_addr,
 812                       const u8 *buf, size_t len)
 813 {
 814         struct ibss_rsn_peer *peer;
 815
 816         if (ibss_rsn == NULL)
 817                 return -1;
 818
 819         peer = ibss_rsn_get_peer(ibss_rsn, src_addr);
 820         if (peer)
 821                 return ibss_rsn_process_rx_eapol(ibss_rsn, peer, buf, len);
 822
 823         if (ibss_rsn_eapol_dst_supp(buf, len) > 0) {
 824                 /*
 825                  * Create new IBSS peer based on an EAPOL message from the peer
 826                  * Authenticator.
 827                  */
 828                 peer = ibss_rsn_peer_init(ibss_rsn, src_addr);
 829                 if (peer == NULL)
 830                         return -1;
 831
 832                 /* assume the peer is authenticated already */
 833                 wpa_printf(MSG_DEBUG, "RSN: IBSS Not using IBSS Auth for peer "
 834                            MACSTR, MAC2STR(src_addr));
 835                 ibss_rsn_peer_authenticated(ibss_rsn, peer,
 836                                             IBSS_RSN_AUTH_EAPOL_BY_US);
 837
 838                 return ibss_rsn_process_rx_eapol(ibss_rsn, ibss_rsn->peers,
 839                                                  buf, len);
 840         }
 841
 842         return 0;
 843 }
 844
 845 void ibss_rsn_set_psk(struct ibss_rsn *ibss_rsn, const u8 *psk)
 846 {
 847         if (ibss_rsn == NULL)
 848                 return;
 849         os_memcpy(ibss_rsn->psk, psk, PMK_LEN);
 850 }
 851
 852
 853 static void ibss_rsn_handle_auth_1_of_2(struct ibss_rsn *ibss_rsn,
 854                                         struct ibss_rsn_peer *peer,
 855                                         const u8* addr)
 856 {
 857         wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 1) from " MACSTR,
 858                    MAC2STR(addr));
 859
 860         if (peer &&
 861             peer->authentication_status & (IBSS_RSN_SET_PTK_SUPP |
 862                                            IBSS_RSN_SET_PTK_AUTH)) {
 863                 /* Clear the TK for this pair to allow recovery from the case
 864                  * where the peer STA has restarted and lost its key while we
 865                  * still have a pairwise key configured. */
 866                 wpa_printf(MSG_DEBUG, "RSN: Clear pairwise key for peer "
 867                            MACSTR, MAC2STR(addr));
 868                 wpa_drv_set_key(ibss_rsn->wpa_s, WPA_ALG_NONE, addr, 0, 0,
 869                                 NULL, 0, NULL, 0, KEY_FLAG_PAIRWISE);
 870         }
 871
 872         if (peer &&
 873             peer->authentication_status & IBSS_RSN_AUTH_EAPOL_BY_PEER) {
 874                 if (peer->own_auth_tx.sec) {
 875                         struct os_reltime now, diff;
 876                         os_get_reltime(&now);
 877                         os_reltime_sub(&now, &peer->own_auth_tx, &diff);
 878                         if (diff.sec == 0 && diff.usec < 500000) {
 879                                 wpa_printf(MSG_DEBUG, "RSN: Skip IBSS reinit since only %u usec from own Auth frame TX",
 880                                            (int) diff.usec);
 881                                 goto skip_reinit;
 882                         }
 883                 }
 884                 /*
 885                  * A peer sent us an Authentication frame even though it already
 886                  * started an EAPOL session. We should reinit state machines
 887                  * here, but it's much more complicated than just deleting and
 888                  * recreating the state machine
 889                  */
 890                 wpa_printf(MSG_DEBUG, "RSN: IBSS Reinitializing station "
 891                            MACSTR, MAC2STR(addr));
 892
 893                 ibss_rsn_stop(ibss_rsn, addr);
 894                 peer = NULL;
 895         }
 896
 897         if (!peer) {
 898                 peer = ibss_rsn_peer_init(ibss_rsn, addr);
 899                 if (!peer)
 900                         return;
 901
 902                 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth started by peer " MACSTR,
 903                            MAC2STR(addr));
 904         }
 905
 906 skip_reinit:
 907         /* reply with an Authentication frame now, before sending an EAPOL */
 908         ibss_rsn_send_auth(ibss_rsn, addr, 2);
 909         /* no need to start another AUTH challenge in the other way.. */
 910         ibss_rsn_peer_authenticated(ibss_rsn, peer, IBSS_RSN_AUTH_EAPOL_BY_US);
 911 }
 912
 913
 914 void ibss_rsn_handle_auth(struct ibss_rsn *ibss_rsn, const u8 *auth_frame,
 915                           size_t len)
 916 {
 917         const struct ieee80211_mgmt *header;
 918         struct ibss_rsn_peer *peer;
 919         size_t auth_length;
 920
 921         header = (const struct ieee80211_mgmt *) auth_frame;
 922         auth_length = IEEE80211_HDRLEN + sizeof(header->u.auth);
 923
 924         if (ibss_rsn == NULL || len < auth_length)
 925                 return;
 926
 927         if (le_to_host16(header->u.auth.auth_alg) != WLAN_AUTH_OPEN ||
 928             le_to_host16(header->u.auth.status_code) != WLAN_STATUS_SUCCESS)
 929                 return;
 930
 931         peer = ibss_rsn_get_peer(ibss_rsn, header->sa);
 932
 933         switch (le_to_host16(header->u.auth.auth_transaction)) {
 934         case 1:
 935                 ibss_rsn_handle_auth_1_of_2(ibss_rsn, peer, header->sa);
 936                 break;
 937         case 2:
 938                 wpa_printf(MSG_DEBUG, "RSN: IBSS RX Auth frame (SEQ 2) from "
 939                            MACSTR, MAC2STR(header->sa));
 940                 if (!peer) {
 941                         wpa_printf(MSG_DEBUG, "RSN: Received Auth seq 2 from "
 942                                    "unknown STA " MACSTR, MAC2STR(header->sa));
 943                         break;
 944                 }
 945
 946                 /* authentication has been completed */
 947                 eloop_cancel_timeout(ibss_rsn_auth_timeout, peer, NULL);
 948                 wpa_printf(MSG_DEBUG, "RSN: IBSS Auth completed with " MACSTR,
 949                            MAC2STR(header->sa));
 950                 ibss_rsn_peer_authenticated(ibss_rsn, peer,
 951                                             IBSS_RSN_AUTH_BY_US);
 952                 break;
 953         }
 954 }