src/rsn_supp/wpa.c

   1 /*
   2  * WPA Supplicant - WPA state machine and EAPOL-Key processing
   3  * Copyright (c) 2003-2008, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "crypto/aes_wrap.h"
  19 #include "crypto/crypto.h"
  20 #include "common/ieee802_11_defs.h"
  21 #include "eapol_supp/eapol_supp_sm.h"
  22 #include "wpa.h"
  23 #include "eloop.h"
  24 #include "preauth.h"
  25 #include "pmksa_cache.h"
  26 #include "wpa_i.h"
  27 #include "wpa_ie.h"
  28 #include "peerkey.h"
  29
  30
  31 /**
  32  * wpa_eapol_key_send - Send WPA/RSN EAPOL-Key message
  33  * @sm: Pointer to WPA state machine data from wpa_sm_init()
  34  * @kck: Key Confirmation Key (KCK, part of PTK)
  35  * @ver: Version field from Key Info
  36  * @dest: Destination address for the frame
  37  * @proto: Ethertype (usually ETH_P_EAPOL)
  38  * @msg: EAPOL-Key message
  39  * @msg_len: Length of message
  40  * @key_mic: Pointer to the buffer to which the EAPOL-Key MIC is written
  41  */
  42 void wpa_eapol_key_send(struct wpa_sm *sm, const u8 *kck,
  43                         int ver, const u8 *dest, u16 proto,
  44                         u8 *msg, size_t msg_len, u8 *key_mic)
  45 {
  46         if (is_zero_ether_addr(dest) && is_zero_ether_addr(sm->bssid)) {
  47                 /*
  48                  * Association event was not yet received; try to fetch
  49                  * BSSID from the driver.
  50                  */
  51                 if (wpa_sm_get_bssid(sm, sm->bssid) < 0) {
  52                         wpa_printf(MSG_DEBUG, "WPA: Failed to read BSSID for "
  53                                    "EAPOL-Key destination address");
  54                 } else {
  55                         dest = sm->bssid;
  56                         wpa_printf(MSG_DEBUG, "WPA: Use BSSID (" MACSTR
  57                                    ") as the destination for EAPOL-Key",
  58                                    MAC2STR(dest));
  59                 }
  60         }
  61         if (key_mic &&
  62             wpa_eapol_key_mic(kck, ver, msg, msg_len, key_mic)) {
  63                 wpa_printf(MSG_ERROR, "WPA: Failed to generate EAPOL-Key "
  64                            "version %d MIC", ver);
  65                 goto out;
  66         }
  67         wpa_hexdump(MSG_MSGDUMP, "WPA: TX EAPOL-Key", msg, msg_len);
  68         wpa_sm_ether_send(sm, dest, proto, msg, msg_len);
  69         eapol_sm_notify_tx_eapol_key(sm->eapol);
  70 out:
  71         os_free(msg);
  72 }
  73
  74
  75 /**
  76  * wpa_sm_key_request - Send EAPOL-Key Request
  77  * @sm: Pointer to WPA state machine data from wpa_sm_init()
  78  * @error: Indicate whether this is an Michael MIC error report
  79  * @pairwise: 1 = error report for pairwise packet, 0 = for group packet
  80  *
  81  * Send an EAPOL-Key Request to the current authenticator. This function is
  82  * used to request rekeying and it is usually called when a local Michael MIC
  83  * failure is detected.
  84  */
  85 void wpa_sm_key_request(struct wpa_sm *sm, int error, int pairwise)
  86 {
  87         size_t rlen;
  88         struct wpa_eapol_key *reply;
  89         int key_info, ver;
  90         u8 bssid[ETH_ALEN], *rbuf;
  91
  92         if (wpa_key_mgmt_ft(sm->key_mgmt) || wpa_key_mgmt_sha256(sm->key_mgmt))
  93                 ver = WPA_KEY_INFO_TYPE_AES_128_CMAC;
  94         else if (sm->pairwise_cipher == WPA_CIPHER_CCMP)
  95                 ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
  96         else
  97                 ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
  98
  99         if (wpa_sm_get_bssid(sm, bssid) < 0) {
 100                 wpa_printf(MSG_WARNING, "Failed to read BSSID for EAPOL-Key "
 101                            "request");
 102                 return;
 103         }
 104
 105         rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
 106                                   sizeof(*reply), &rlen, (void *) &reply);
 107         if (rbuf == NULL)
 108                 return;
 109
 110         reply->type = sm->proto == WPA_PROTO_RSN ?
 111                 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
 112         key_info = WPA_KEY_INFO_REQUEST | ver;
 113         if (sm->ptk_set)
 114                 key_info |= WPA_KEY_INFO_MIC;
 115         if (error)
 116                 key_info |= WPA_KEY_INFO_ERROR;
 117         if (pairwise)
 118                 key_info |= WPA_KEY_INFO_KEY_TYPE;
 119         WPA_PUT_BE16(reply->key_info, key_info);
 120         WPA_PUT_BE16(reply->key_length, 0);
 121         os_memcpy(reply->replay_counter, sm->request_counter,
 122                   WPA_REPLAY_COUNTER_LEN);
 123         inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN);
 124
 125         WPA_PUT_BE16(reply->key_data_length, 0);
 126
 127         wpa_printf(MSG_INFO, "WPA: Sending EAPOL-Key Request (error=%d "
 128                    "pairwise=%d ptk_set=%d len=%lu)",
 129                    error, pairwise, sm->ptk_set, (unsigned long) rlen);
 130         wpa_eapol_key_send(sm, sm->ptk.kck, ver, bssid, ETH_P_EAPOL,
 131                            rbuf, rlen, key_info & WPA_KEY_INFO_MIC ?
 132                            reply->key_mic : NULL);
 133 }
 134
 135
 136 static int wpa_supplicant_get_pmk(struct wpa_sm *sm,
 137                                   const unsigned char *src_addr,
 138                                   const u8 *pmkid)
 139 {
 140         int abort_cached = 0;
 141
 142         if (pmkid && !sm->cur_pmksa) {
 143                 /* When using drivers that generate RSN IE, wpa_supplicant may
 144                  * not have enough time to get the association information
 145                  * event before receiving this 1/4 message, so try to find a
 146                  * matching PMKSA cache entry here. */
 147                 sm->cur_pmksa = pmksa_cache_get(sm->pmksa, src_addr, pmkid);
 148                 if (sm->cur_pmksa) {
 149                         wpa_printf(MSG_DEBUG, "RSN: found matching PMKID from "
 150                                    "PMKSA cache");
 151                 } else {
 152                         wpa_printf(MSG_DEBUG, "RSN: no matching PMKID found");
 153                         abort_cached = 1;
 154                 }
 155         }
 156
 157         if (pmkid && sm->cur_pmksa &&
 158             os_memcmp(pmkid, sm->cur_pmksa->pmkid, PMKID_LEN) == 0) {
 159                 wpa_hexdump(MSG_DEBUG, "RSN: matched PMKID", pmkid, PMKID_LEN);
 160                 wpa_sm_set_pmk_from_pmksa(sm);
 161                 wpa_hexdump_key(MSG_DEBUG, "RSN: PMK from PMKSA cache",
 162                                 sm->pmk, sm->pmk_len);
 163                 eapol_sm_notify_cached(sm->eapol);
 164 #ifdef CONFIG_IEEE80211R
 165                 sm->xxkey_len = 0;
 166 #endif /* CONFIG_IEEE80211R */
 167         } else if (wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt) && sm->eapol) {
 168                 int res, pmk_len;
 169                 pmk_len = PMK_LEN;
 170                 res = eapol_sm_get_key(sm->eapol, sm->pmk, PMK_LEN);
 171                 if (res) {
 172                         /*
 173                          * EAP-LEAP is an exception from other EAP methods: it
 174                          * uses only 16-byte PMK.
 175                          */
 176                         res = eapol_sm_get_key(sm->eapol, sm->pmk, 16);
 177                         pmk_len = 16;
 178                 } else {
 179 #ifdef CONFIG_IEEE80211R
 180                         u8 buf[2 * PMK_LEN];
 181                         if (eapol_sm_get_key(sm->eapol, buf, 2 * PMK_LEN) == 0)
 182                         {
 183                                 os_memcpy(sm->xxkey, buf + PMK_LEN, PMK_LEN);
 184                                 sm->xxkey_len = PMK_LEN;
 185                                 os_memset(buf, 0, sizeof(buf));
 186                         }
 187 #endif /* CONFIG_IEEE80211R */
 188                 }
 189                 if (res == 0) {
 190                         wpa_hexdump_key(MSG_DEBUG, "WPA: PMK from EAPOL state "
 191                                         "machines", sm->pmk, pmk_len);
 192                         sm->pmk_len = pmk_len;
 193                         if (sm->proto == WPA_PROTO_RSN) {
 194                                 pmksa_cache_add(sm->pmksa, sm->pmk, pmk_len,
 195                                                 src_addr, sm->own_addr,
 196                                                 sm->network_ctx, sm->key_mgmt);
 197                         }
 198                         if (!sm->cur_pmksa && pmkid &&
 199                             pmksa_cache_get(sm->pmksa, src_addr, pmkid)) {
 200                                 wpa_printf(MSG_DEBUG, "RSN: the new PMK "
 201                                            "matches with the PMKID");
 202                                 abort_cached = 0;
 203                         }
 204                 } else {
 205                         wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
 206                                 "WPA: Failed to get master session key from "
 207                                 "EAPOL state machines");
 208                         wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
 209                                 "WPA: Key handshake aborted");
 210                         if (sm->cur_pmksa) {
 211                                 wpa_printf(MSG_DEBUG, "RSN: Cancelled PMKSA "
 212                                            "caching attempt");
 213                                 sm->cur_pmksa = NULL;
 214                                 abort_cached = 1;
 215                         } else if (!abort_cached) {
 216                                 return -1;
 217                         }
 218                 }
 219         }
 220
 221         if (abort_cached && wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt)) {
 222                 /* Send EAPOL-Start to trigger full EAP authentication. */
 223                 u8 *buf;
 224                 size_t buflen;
 225
 226                 wpa_printf(MSG_DEBUG, "RSN: no PMKSA entry found - trigger "
 227                            "full EAP authentication");
 228                 buf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_START,
 229                                          NULL, 0, &buflen, NULL);
 230                 if (buf) {
 231                         wpa_sm_ether_send(sm, sm->bssid, ETH_P_EAPOL,
 232                                           buf, buflen);
 233                         os_free(buf);
 234                 }
 235
 236                 return -1;
 237         }
 238
 239         return 0;
 240 }
 241
 242
 243 /**
 244  * wpa_supplicant_send_2_of_4 - Send message 2 of WPA/RSN 4-Way Handshake
 245  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 246  * @dst: Destination address for the frame
 247  * @key: Pointer to the EAPOL-Key frame header
 248  * @ver: Version bits from EAPOL-Key Key Info
 249  * @nonce: Nonce value for the EAPOL-Key frame
 250  * @wpa_ie: WPA/RSN IE
 251  * @wpa_ie_len: Length of the WPA/RSN IE
 252  * @ptk: PTK to use for keyed hash and encryption
 253  * Returns: 0 on success, -1 on failure
 254  */
 255 int wpa_supplicant_send_2_of_4(struct wpa_sm *sm, const unsigned char *dst,
 256                                const struct wpa_eapol_key *key,
 257                                int ver, const u8 *nonce,
 258                                const u8 *wpa_ie, size_t wpa_ie_len,
 259                                struct wpa_ptk *ptk)
 260 {
 261         size_t rlen;
 262         struct wpa_eapol_key *reply;
 263         u8 *rbuf;
 264
 265         if (wpa_ie == NULL) {
 266                 wpa_printf(MSG_WARNING, "WPA: No wpa_ie set - cannot "
 267                            "generate msg 2/4");
 268                 return -1;
 269         }
 270
 271         wpa_hexdump(MSG_DEBUG, "WPA: WPA IE for msg 2/4", wpa_ie, wpa_ie_len);
 272
 273         rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY,
 274                                   NULL, sizeof(*reply) + wpa_ie_len,
 275                                   &rlen, (void *) &reply);
 276         if (rbuf == NULL)
 277                 return -1;
 278
 279         reply->type = sm->proto == WPA_PROTO_RSN ?
 280                 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
 281         WPA_PUT_BE16(reply->key_info,
 282                      ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_MIC);
 283         if (sm->proto == WPA_PROTO_RSN)
 284                 WPA_PUT_BE16(reply->key_length, 0);
 285         else
 286                 os_memcpy(reply->key_length, key->key_length, 2);
 287         os_memcpy(reply->replay_counter, key->replay_counter,
 288                   WPA_REPLAY_COUNTER_LEN);
 289
 290         WPA_PUT_BE16(reply->key_data_length, wpa_ie_len);
 291         os_memcpy(reply + 1, wpa_ie, wpa_ie_len);
 292
 293         os_memcpy(reply->key_nonce, nonce, WPA_NONCE_LEN);
 294
 295         wpa_printf(MSG_DEBUG, "WPA: Sending EAPOL-Key 2/4");
 296         wpa_eapol_key_send(sm, ptk->kck, ver, dst, ETH_P_EAPOL,
 297                            rbuf, rlen, reply->key_mic);
 298
 299         return 0;
 300 }
 301
 302
 303 static int wpa_derive_ptk(struct wpa_sm *sm, const unsigned char *src_addr,
 304                           const struct wpa_eapol_key *key,
 305                           struct wpa_ptk *ptk)
 306 {
 307         size_t ptk_len = sm->pairwise_cipher == WPA_CIPHER_CCMP ? 48 : 64;
 308 #ifdef CONFIG_IEEE80211R
 309         if (wpa_key_mgmt_ft(sm->key_mgmt))
 310                 return wpa_derive_ptk_ft(sm, src_addr, key, ptk, ptk_len);
 311 #endif /* CONFIG_IEEE80211R */
 312
 313         wpa_pmk_to_ptk(sm->pmk, sm->pmk_len, "Pairwise key expansion",
 314                        sm->own_addr, sm->bssid, sm->snonce, key->key_nonce,
 315                        (u8 *) ptk, ptk_len,
 316                        wpa_key_mgmt_sha256(sm->key_mgmt));
 317         return 0;
 318 }
 319
 320
 321 static void wpa_supplicant_process_1_of_4(struct wpa_sm *sm,
 322                                           const unsigned char *src_addr,
 323                                           const struct wpa_eapol_key *key,
 324                                           u16 ver)
 325 {
 326         struct wpa_eapol_ie_parse ie;
 327         struct wpa_ptk *ptk;
 328         u8 buf[8];
 329
 330         if (wpa_sm_get_network_ctx(sm) == NULL) {
 331                 wpa_printf(MSG_WARNING, "WPA: No SSID info found (msg 1 of "
 332                            "4).");
 333                 return;
 334         }
 335
 336         wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE);
 337         wpa_printf(MSG_DEBUG, "WPA: RX message 1 of 4-Way Handshake from "
 338                    MACSTR " (ver=%d)", MAC2STR(src_addr), ver);
 339
 340         os_memset(&ie, 0, sizeof(ie));
 341
 342 #ifndef CONFIG_NO_WPA2
 343         if (sm->proto == WPA_PROTO_RSN) {
 344                 /* RSN: msg 1/4 should contain PMKID for the selected PMK */
 345                 const u8 *_buf = (const u8 *) (key + 1);
 346                 size_t len = WPA_GET_BE16(key->key_data_length);
 347                 wpa_hexdump(MSG_DEBUG, "RSN: msg 1/4 key data", _buf, len);
 348                 wpa_supplicant_parse_ies(_buf, len, &ie);
 349                 if (ie.pmkid) {
 350                         wpa_hexdump(MSG_DEBUG, "RSN: PMKID from "
 351                                     "Authenticator", ie.pmkid, PMKID_LEN);
 352                 }
 353         }
 354 #endif /* CONFIG_NO_WPA2 */
 355
 356         if (wpa_supplicant_get_pmk(sm, src_addr, ie.pmkid))
 357                 goto failed;
 358
 359         if (sm->renew_snonce) {
 360                 if (os_get_random(sm->snonce, WPA_NONCE_LEN)) {
 361                         wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
 362                                 "WPA: Failed to get random data for SNonce");
 363                         goto failed;
 364                 }
 365                 sm->renew_snonce = 0;
 366                 wpa_hexdump(MSG_DEBUG, "WPA: Renewed SNonce",
 367                             sm->snonce, WPA_NONCE_LEN);
 368         }
 369
 370         /* Calculate PTK which will be stored as a temporary PTK until it has
 371          * been verified when processing message 3/4. */
 372         ptk = &sm->tptk;
 373         wpa_derive_ptk(sm, src_addr, key, ptk);
 374         /* Supplicant: swap tx/rx Mic keys */
 375         os_memcpy(buf, ptk->u.auth.tx_mic_key, 8);
 376         os_memcpy(ptk->u.auth.tx_mic_key, ptk->u.auth.rx_mic_key, 8);
 377         os_memcpy(ptk->u.auth.rx_mic_key, buf, 8);
 378         sm->tptk_set = 1;
 379
 380         if (wpa_supplicant_send_2_of_4(sm, sm->bssid, key, ver, sm->snonce,
 381                                        sm->assoc_wpa_ie, sm->assoc_wpa_ie_len,
 382                                        ptk))
 383                 goto failed;
 384
 385         os_memcpy(sm->anonce, key->key_nonce, WPA_NONCE_LEN);
 386         return;
 387
 388 failed:
 389         wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
 390 }
 391
 392
 393 static void wpa_sm_start_preauth(void *eloop_ctx, void *timeout_ctx)
 394 {
 395         struct wpa_sm *sm = eloop_ctx;
 396         rsn_preauth_candidate_process(sm);
 397 }
 398
 399
 400 static void wpa_supplicant_key_neg_complete(struct wpa_sm *sm,
 401                                             const u8 *addr, int secure)
 402 {
 403         wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
 404                 "WPA: Key negotiation completed with "
 405                 MACSTR " [PTK=%s GTK=%s]", MAC2STR(addr),
 406                 wpa_cipher_txt(sm->pairwise_cipher),
 407                 wpa_cipher_txt(sm->group_cipher));
 408         wpa_sm_cancel_auth_timeout(sm);
 409         wpa_sm_set_state(sm, WPA_COMPLETED);
 410
 411         if (secure) {
 412                 wpa_sm_mlme_setprotection(
 413                         sm, addr, MLME_SETPROTECTION_PROTECT_TYPE_RX_TX,
 414                         MLME_SETPROTECTION_KEY_TYPE_PAIRWISE);
 415                 eapol_sm_notify_portValid(sm->eapol, TRUE);
 416                 if (wpa_key_mgmt_wpa_psk(sm->key_mgmt))
 417                         eapol_sm_notify_eap_success(sm->eapol, TRUE);
 418                 /*
 419                  * Start preauthentication after a short wait to avoid a
 420                  * possible race condition between the data receive and key
 421                  * configuration after the 4-Way Handshake. This increases the
 422                  * likelyhood of the first preauth EAPOL-Start frame getting to
 423                  * the target AP.
 424                  */
 425                 eloop_register_timeout(1, 0, wpa_sm_start_preauth, sm, NULL);
 426         }
 427
 428         if (sm->cur_pmksa && sm->cur_pmksa->opportunistic) {
 429                 wpa_printf(MSG_DEBUG, "RSN: Authenticator accepted "
 430                            "opportunistic PMKSA entry - marking it valid");
 431                 sm->cur_pmksa->opportunistic = 0;
 432         }
 433
 434 #ifdef CONFIG_IEEE80211R
 435         if (wpa_key_mgmt_ft(sm->key_mgmt)) {
 436                 /* Prepare for the next transition */
 437                 wpa_ft_prepare_auth_request(sm);
 438         }
 439 #endif /* CONFIG_IEEE80211R */
 440 }
 441
 442
 443 static void wpa_sm_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
 444 {
 445         struct wpa_sm *sm = eloop_ctx;
 446         wpa_printf(MSG_DEBUG, "WPA: Request PTK rekeying");
 447         wpa_sm_key_request(sm, 0, 1);
 448 }
 449
 450
 451 static int wpa_supplicant_install_ptk(struct wpa_sm *sm,
 452                                       const struct wpa_eapol_key *key)
 453 {
 454         int keylen, rsclen;
 455         wpa_alg alg;
 456         const u8 *key_rsc;
 457         u8 null_rsc[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
 458
 459         wpa_printf(MSG_DEBUG, "WPA: Installing PTK to the driver.");
 460
 461         switch (sm->pairwise_cipher) {
 462         case WPA_CIPHER_CCMP:
 463                 alg = WPA_ALG_CCMP;
 464                 keylen = 16;
 465                 rsclen = 6;
 466                 break;
 467         case WPA_CIPHER_TKIP:
 468                 alg = WPA_ALG_TKIP;
 469                 keylen = 32;
 470                 rsclen = 6;
 471                 break;
 472         case WPA_CIPHER_NONE:
 473                 wpa_printf(MSG_DEBUG, "WPA: Pairwise Cipher Suite: "
 474                            "NONE - do not use pairwise keys");
 475                 return 0;
 476         default:
 477                 wpa_printf(MSG_WARNING, "WPA: Unsupported pairwise cipher %d",
 478                            sm->pairwise_cipher);
 479                 return -1;
 480         }
 481
 482         if (sm->proto == WPA_PROTO_RSN) {
 483                 key_rsc = null_rsc;
 484         } else {
 485                 key_rsc = key->key_rsc;
 486                 wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, rsclen);
 487         }
 488
 489         if (wpa_sm_set_key(sm, alg, sm->bssid, 0, 1, key_rsc, rsclen,
 490                            (u8 *) sm->ptk.tk1, keylen) < 0) {
 491                 wpa_printf(MSG_WARNING, "WPA: Failed to set PTK to the "
 492                            "driver (alg=%d keylen=%d bssid=" MACSTR ")",
 493                            alg, keylen, MAC2STR(sm->bssid));
 494                 return -1;
 495         }
 496
 497         if (sm->wpa_ptk_rekey) {
 498                 eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL);
 499                 eloop_register_timeout(sm->wpa_ptk_rekey, 0, wpa_sm_rekey_ptk,
 500                                        sm, NULL);
 501         }
 502
 503         return 0;
 504 }
 505
 506
 507 static int wpa_supplicant_check_group_cipher(int group_cipher,
 508                                              int keylen, int maxkeylen,
 509                                              int *key_rsc_len, wpa_alg *alg)
 510 {
 511         int ret = 0;
 512
 513         switch (group_cipher) {
 514         case WPA_CIPHER_CCMP:
 515                 if (keylen != 16 || maxkeylen < 16) {
 516                         ret = -1;
 517                         break;
 518                 }
 519                 *key_rsc_len = 6;
 520                 *alg = WPA_ALG_CCMP;
 521                 break;
 522         case WPA_CIPHER_TKIP:
 523                 if (keylen != 32 || maxkeylen < 32) {
 524                         ret = -1;
 525                         break;
 526                 }
 527                 *key_rsc_len = 6;
 528                 *alg = WPA_ALG_TKIP;
 529                 break;
 530         case WPA_CIPHER_WEP104:
 531                 if (keylen != 13 || maxkeylen < 13) {
 532                         ret = -1;
 533                         break;
 534                 }
 535                 *key_rsc_len = 0;
 536                 *alg = WPA_ALG_WEP;
 537                 break;
 538         case WPA_CIPHER_WEP40:
 539                 if (keylen != 5 || maxkeylen < 5) {
 540                         ret = -1;
 541                         break;
 542                 }
 543                 *key_rsc_len = 0;
 544                 *alg = WPA_ALG_WEP;
 545                 break;
 546         default:
 547                 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
 548                            group_cipher);
 549                 return -1;
 550         }
 551
 552         if (ret < 0 ) {
 553                 wpa_printf(MSG_WARNING, "WPA: Unsupported %s Group Cipher key "
 554                            "length %d (%d).",
 555                            wpa_cipher_txt(group_cipher), keylen, maxkeylen);
 556         }
 557
 558         return ret;
 559 }
 560
 561
 562 struct wpa_gtk_data {
 563         wpa_alg alg;
 564         int tx, key_rsc_len, keyidx;
 565         u8 gtk[32];
 566         int gtk_len;
 567 };
 568
 569
 570 static int wpa_supplicant_install_gtk(struct wpa_sm *sm,
 571                                       const struct wpa_gtk_data *gd,
 572                                       const u8 *key_rsc)
 573 {
 574         const u8 *_gtk = gd->gtk;
 575         u8 gtk_buf[32];
 576
 577         wpa_hexdump_key(MSG_DEBUG, "WPA: Group Key", gd->gtk, gd->gtk_len);
 578         wpa_printf(MSG_DEBUG, "WPA: Installing GTK to the driver "
 579                    "(keyidx=%d tx=%d len=%d).", gd->keyidx, gd->tx,
 580                    gd->gtk_len);
 581         wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, gd->key_rsc_len);
 582         if (sm->group_cipher == WPA_CIPHER_TKIP) {
 583                 /* Swap Tx/Rx keys for Michael MIC */
 584                 os_memcpy(gtk_buf, gd->gtk, 16);
 585                 os_memcpy(gtk_buf + 16, gd->gtk + 24, 8);
 586                 os_memcpy(gtk_buf + 24, gd->gtk + 16, 8);
 587                 _gtk = gtk_buf;
 588         }
 589         if (sm->pairwise_cipher == WPA_CIPHER_NONE) {
 590                 if (wpa_sm_set_key(sm, gd->alg,
 591                                    (u8 *) "\xff\xff\xff\xff\xff\xff",
 592                                    gd->keyidx, 1, key_rsc, gd->key_rsc_len,
 593                                    _gtk, gd->gtk_len) < 0) {
 594                         wpa_printf(MSG_WARNING, "WPA: Failed to set "
 595                                    "GTK to the driver (Group only).");
 596                         return -1;
 597                 }
 598         } else if (wpa_sm_set_key(sm, gd->alg,
 599                                   (u8 *) "\xff\xff\xff\xff\xff\xff",
 600                                   gd->keyidx, gd->tx, key_rsc, gd->key_rsc_len,
 601                                   _gtk, gd->gtk_len) < 0) {
 602                 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to "
 603                            "the driver (alg=%d keylen=%d keyidx=%d)",
 604                            gd->alg, gd->gtk_len, gd->keyidx);
 605                 return -1;
 606         }
 607
 608         return 0;
 609 }
 610
 611
 612 static int wpa_supplicant_gtk_tx_bit_workaround(const struct wpa_sm *sm,
 613                                                 int tx)
 614 {
 615         if (tx && sm->pairwise_cipher != WPA_CIPHER_NONE) {
 616                 /* Ignore Tx bit for GTK if a pairwise key is used. One AP
 617                  * seemed to set this bit (incorrectly, since Tx is only when
 618                  * doing Group Key only APs) and without this workaround, the
 619                  * data connection does not work because wpa_supplicant
 620                  * configured non-zero keyidx to be used for unicast. */
 621                 wpa_printf(MSG_INFO, "WPA: Tx bit set for GTK, but pairwise "
 622                            "keys are used - ignore Tx bit");
 623                 return 0;
 624         }
 625         return tx;
 626 }
 627
 628
 629 static int wpa_supplicant_pairwise_gtk(struct wpa_sm *sm,
 630                                        const struct wpa_eapol_key *key,
 631                                        const u8 *gtk, size_t gtk_len,
 632                                        int key_info)
 633 {
 634 #ifndef CONFIG_NO_WPA2
 635         struct wpa_gtk_data gd;
 636
 637         /*
 638          * IEEE Std 802.11i-2004 - 8.5.2 EAPOL-Key frames - Figure 43x
 639          * GTK KDE format:
 640          * KeyID[bits 0-1], Tx [bit 2], Reserved [bits 3-7]
 641          * Reserved [bits 0-7]
 642          * GTK
 643          */
 644
 645         os_memset(&gd, 0, sizeof(gd));
 646         wpa_hexdump_key(MSG_DEBUG, "RSN: received GTK in pairwise handshake",
 647                         gtk, gtk_len);
 648
 649         if (gtk_len < 2 || gtk_len - 2 > sizeof(gd.gtk))
 650                 return -1;
 651
 652         gd.keyidx = gtk[0] & 0x3;
 653         gd.tx = wpa_supplicant_gtk_tx_bit_workaround(sm,
 654                                                      !!(gtk[0] & BIT(2)));
 655         gtk += 2;
 656         gtk_len -= 2;
 657
 658         os_memcpy(gd.gtk, gtk, gtk_len);
 659         gd.gtk_len = gtk_len;
 660
 661         if (wpa_supplicant_check_group_cipher(sm->group_cipher,
 662                                               gtk_len, gtk_len,
 663                                               &gd.key_rsc_len, &gd.alg) ||
 664             wpa_supplicant_install_gtk(sm, &gd, key->key_rsc)) {
 665                 wpa_printf(MSG_DEBUG, "RSN: Failed to install GTK");
 666                 return -1;
 667         }
 668
 669         wpa_supplicant_key_neg_complete(sm, sm->bssid,
 670                                         key_info & WPA_KEY_INFO_SECURE);
 671         return 0;
 672 #else /* CONFIG_NO_WPA2 */
 673         return -1;
 674 #endif /* CONFIG_NO_WPA2 */
 675 }
 676
 677
 678 static int ieee80211w_set_keys(struct wpa_sm *sm,
 679                                struct wpa_eapol_ie_parse *ie)
 680 {
 681 #ifdef CONFIG_IEEE80211W
 682         if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
 683                 return 0;
 684
 685         if (ie->igtk) {
 686                 const struct wpa_igtk_kde *igtk;
 687                 u16 keyidx;
 688                 if (ie->igtk_len != sizeof(*igtk))
 689                         return -1;
 690                 igtk = (const struct wpa_igtk_kde *) ie->igtk;
 691                 keyidx = WPA_GET_LE16(igtk->keyid);
 692                 wpa_printf(MSG_DEBUG, "WPA: IGTK keyid %d "
 693                            "pn %02x%02x%02x%02x%02x%02x",
 694                            keyidx, MAC2STR(igtk->pn));
 695                 wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK",
 696                                 igtk->igtk, WPA_IGTK_LEN);
 697                 if (keyidx > 4095) {
 698                         wpa_printf(MSG_WARNING, "WPA: Invalid IGTK KeyID %d",
 699                                    keyidx);
 700                         return -1;
 701                 }
 702                 if (wpa_sm_set_key(sm, WPA_ALG_IGTK,
 703                                    (u8 *) "\xff\xff\xff\xff\xff\xff",
 704                                    keyidx, 0, igtk->pn, sizeof(igtk->pn),
 705                                    igtk->igtk, WPA_IGTK_LEN) < 0) {
 706                         wpa_printf(MSG_WARNING, "WPA: Failed to configure IGTK"
 707                                    " to the driver");
 708                         return -1;
 709                 }
 710         }
 711
 712         return 0;
 713 #else /* CONFIG_IEEE80211W */
 714         return 0;
 715 #endif /* CONFIG_IEEE80211W */
 716 }
 717
 718
 719 static void wpa_report_ie_mismatch(struct wpa_sm *sm,
 720                                    const char *reason, const u8 *src_addr,
 721                                    const u8 *wpa_ie, size_t wpa_ie_len,
 722                                    const u8 *rsn_ie, size_t rsn_ie_len)
 723 {
 724         wpa_msg(sm->ctx->msg_ctx, MSG_WARNING, "WPA: %s (src=" MACSTR ")",
 725                 reason, MAC2STR(src_addr));
 726
 727         if (sm->ap_wpa_ie) {
 728                 wpa_hexdump(MSG_INFO, "WPA: WPA IE in Beacon/ProbeResp",
 729                             sm->ap_wpa_ie, sm->ap_wpa_ie_len);
 730         }
 731         if (wpa_ie) {
 732                 if (!sm->ap_wpa_ie) {
 733                         wpa_printf(MSG_INFO, "WPA: No WPA IE in "
 734                                    "Beacon/ProbeResp");
 735                 }
 736                 wpa_hexdump(MSG_INFO, "WPA: WPA IE in 3/4 msg",
 737                             wpa_ie, wpa_ie_len);
 738         }
 739
 740         if (sm->ap_rsn_ie) {
 741                 wpa_hexdump(MSG_INFO, "WPA: RSN IE in Beacon/ProbeResp",
 742                             sm->ap_rsn_ie, sm->ap_rsn_ie_len);
 743         }
 744         if (rsn_ie) {
 745                 if (!sm->ap_rsn_ie) {
 746                         wpa_printf(MSG_INFO, "WPA: No RSN IE in "
 747                                    "Beacon/ProbeResp");
 748                 }
 749                 wpa_hexdump(MSG_INFO, "WPA: RSN IE in 3/4 msg",
 750                             rsn_ie, rsn_ie_len);
 751         }
 752
 753         wpa_sm_disassociate(sm, WLAN_REASON_IE_IN_4WAY_DIFFERS);
 754 }
 755
 756
 757 static int wpa_supplicant_validate_ie(struct wpa_sm *sm,
 758                                       const unsigned char *src_addr,
 759                                       struct wpa_eapol_ie_parse *ie)
 760 {
 761         if (sm->ap_wpa_ie == NULL && sm->ap_rsn_ie == NULL) {
 762                 wpa_printf(MSG_DEBUG, "WPA: No WPA/RSN IE for this AP known. "
 763                            "Trying to get from scan results");
 764                 if (wpa_sm_get_beacon_ie(sm) < 0) {
 765                         wpa_printf(MSG_WARNING, "WPA: Could not find AP from "
 766                                    "the scan results");
 767                 } else {
 768                         wpa_printf(MSG_DEBUG, "WPA: Found the current AP from "
 769                                    "updated scan results");
 770                 }
 771         }
 772
 773         if (ie->wpa_ie == NULL && ie->rsn_ie == NULL &&
 774             (sm->ap_wpa_ie || sm->ap_rsn_ie)) {
 775                 wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match "
 776                                        "with IE in Beacon/ProbeResp (no IE?)",
 777                                        src_addr, ie->wpa_ie, ie->wpa_ie_len,
 778                                        ie->rsn_ie, ie->rsn_ie_len);
 779                 return -1;
 780         }
 781
 782         if ((ie->wpa_ie && sm->ap_wpa_ie &&
 783              (ie->wpa_ie_len != sm->ap_wpa_ie_len ||
 784               os_memcmp(ie->wpa_ie, sm->ap_wpa_ie, ie->wpa_ie_len) != 0)) ||
 785             (ie->rsn_ie && sm->ap_rsn_ie &&
 786              (ie->rsn_ie_len != sm->ap_rsn_ie_len ||
 787               os_memcmp(ie->rsn_ie, sm->ap_rsn_ie, ie->rsn_ie_len) != 0))) {
 788                 wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match "
 789                                        "with IE in Beacon/ProbeResp",
 790                                        src_addr, ie->wpa_ie, ie->wpa_ie_len,
 791                                        ie->rsn_ie, ie->rsn_ie_len);
 792                 return -1;
 793         }
 794
 795         if (sm->proto == WPA_PROTO_WPA &&
 796             ie->rsn_ie && sm->ap_rsn_ie == NULL && sm->rsn_enabled) {
 797                 wpa_report_ie_mismatch(sm, "Possible downgrade attack "
 798                                        "detected - RSN was enabled and RSN IE "
 799                                        "was in msg 3/4, but not in "
 800                                        "Beacon/ProbeResp",
 801                                        src_addr, ie->wpa_ie, ie->wpa_ie_len,
 802                                        ie->rsn_ie, ie->rsn_ie_len);
 803                 return -1;
 804         }
 805
 806 #ifdef CONFIG_IEEE80211R
 807         if (wpa_key_mgmt_ft(sm->key_mgmt)) {
 808                 struct rsn_mdie *mdie;
 809                 /* TODO: verify that full MDIE matches with the one from scan
 810                  * results, not only mobility domain */
 811                 mdie = (struct rsn_mdie *) (ie->mdie + 2);
 812                 if (ie->mdie == NULL || ie->mdie_len < 2 + sizeof(*mdie) ||
 813                     os_memcmp(mdie->mobility_domain, sm->mobility_domain,
 814                               MOBILITY_DOMAIN_ID_LEN) != 0) {
 815                         wpa_printf(MSG_DEBUG, "FT: MDIE in msg 3/4 did not "
 816                                    "match with the current mobility domain");
 817                         return -1;
 818                 }
 819         }
 820 #endif /* CONFIG_IEEE80211R */
 821
 822         return 0;
 823 }
 824
 825
 826 /**
 827  * wpa_supplicant_send_4_of_4 - Send message 4 of WPA/RSN 4-Way Handshake
 828  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 829  * @dst: Destination address for the frame
 830  * @key: Pointer to the EAPOL-Key frame header
 831  * @ver: Version bits from EAPOL-Key Key Info
 832  * @key_info: Key Info
 833  * @kde: KDEs to include the EAPOL-Key frame
 834  * @kde_len: Length of KDEs
 835  * @ptk: PTK to use for keyed hash and encryption
 836  * Returns: 0 on success, -1 on failure
 837  */
 838 int wpa_supplicant_send_4_of_4(struct wpa_sm *sm, const unsigned char *dst,
 839                                const struct wpa_eapol_key *key,
 840                                u16 ver, u16 key_info,
 841                                const u8 *kde, size_t kde_len,
 842                                struct wpa_ptk *ptk)
 843 {
 844         size_t rlen;
 845         struct wpa_eapol_key *reply;
 846         u8 *rbuf;
 847
 848         if (kde)
 849                 wpa_hexdump(MSG_DEBUG, "WPA: KDE for msg 4/4", kde, kde_len);
 850
 851         rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
 852                                   sizeof(*reply) + kde_len,
 853                                   &rlen, (void *) &reply);
 854         if (rbuf == NULL)
 855                 return -1;
 856
 857         reply->type = sm->proto == WPA_PROTO_RSN ?
 858                 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
 859         key_info &= WPA_KEY_INFO_SECURE;
 860         key_info |= ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_MIC;
 861         WPA_PUT_BE16(reply->key_info, key_info);
 862         if (sm->proto == WPA_PROTO_RSN)
 863                 WPA_PUT_BE16(reply->key_length, 0);
 864         else
 865                 os_memcpy(reply->key_length, key->key_length, 2);
 866         os_memcpy(reply->replay_counter, key->replay_counter,
 867                   WPA_REPLAY_COUNTER_LEN);
 868
 869         WPA_PUT_BE16(reply->key_data_length, kde_len);
 870         if (kde)
 871                 os_memcpy(reply + 1, kde, kde_len);
 872
 873         wpa_printf(MSG_DEBUG, "WPA: Sending EAPOL-Key 4/4");
 874         wpa_eapol_key_send(sm, ptk->kck, ver, dst, ETH_P_EAPOL,
 875                            rbuf, rlen, reply->key_mic);
 876
 877         return 0;
 878 }
 879
 880
 881 static void wpa_supplicant_process_3_of_4(struct wpa_sm *sm,
 882                                           const struct wpa_eapol_key *key,
 883                                           u16 ver)
 884 {
 885         u16 key_info, keylen, len;
 886         const u8 *pos;
 887         struct wpa_eapol_ie_parse ie;
 888
 889         wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE);
 890         wpa_printf(MSG_DEBUG, "WPA: RX message 3 of 4-Way Handshake from "
 891                    MACSTR " (ver=%d)", MAC2STR(sm->bssid), ver);
 892
 893         key_info = WPA_GET_BE16(key->key_info);
 894
 895         pos = (const u8 *) (key + 1);
 896         len = WPA_GET_BE16(key->key_data_length);
 897         wpa_hexdump(MSG_DEBUG, "WPA: IE KeyData", pos, len);
 898         wpa_supplicant_parse_ies(pos, len, &ie);
 899         if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
 900                 wpa_printf(MSG_WARNING, "WPA: GTK IE in unencrypted key data");
 901                 goto failed;
 902         }
 903 #ifdef CONFIG_IEEE80211W
 904         if (ie.igtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
 905                 wpa_printf(MSG_WARNING, "WPA: IGTK KDE in unencrypted key "
 906                            "data");
 907                 goto failed;
 908         }
 909
 910         if (ie.igtk && ie.igtk_len != sizeof(struct wpa_igtk_kde)) {
 911                 wpa_printf(MSG_WARNING, "WPA: Invalid IGTK KDE length %lu",
 912                            (unsigned long) ie.igtk_len);
 913                 goto failed;
 914         }
 915 #endif /* CONFIG_IEEE80211W */
 916
 917         if (wpa_supplicant_validate_ie(sm, sm->bssid, &ie) < 0)
 918                 goto failed;
 919
 920         if (os_memcmp(sm->anonce, key->key_nonce, WPA_NONCE_LEN) != 0) {
 921                 wpa_printf(MSG_WARNING, "WPA: ANonce from message 1 of 4-Way "
 922                            "Handshake differs from 3 of 4-Way Handshake - drop"
 923                            " packet (src=" MACSTR ")", MAC2STR(sm->bssid));
 924                 goto failed;
 925         }
 926
 927         keylen = WPA_GET_BE16(key->key_length);
 928         switch (sm->pairwise_cipher) {
 929         case WPA_CIPHER_CCMP:
 930                 if (keylen != 16) {
 931                         wpa_printf(MSG_WARNING, "WPA: Invalid CCMP key length "
 932                                    "%d (src=" MACSTR ")",
 933                                    keylen, MAC2STR(sm->bssid));
 934                         goto failed;
 935                 }
 936                 break;
 937         case WPA_CIPHER_TKIP:
 938                 if (keylen != 32) {
 939                         wpa_printf(MSG_WARNING, "WPA: Invalid TKIP key length "
 940                                    "%d (src=" MACSTR ")",
 941                                    keylen, MAC2STR(sm->bssid));
 942                         goto failed;
 943                 }
 944                 break;
 945         }
 946
 947         if (wpa_supplicant_send_4_of_4(sm, sm->bssid, key, ver, key_info,
 948                                        NULL, 0, &sm->ptk)) {
 949                 goto failed;
 950         }
 951
 952         /* SNonce was successfully used in msg 3/4, so mark it to be renewed
 953          * for the next 4-Way Handshake. If msg 3 is received again, the old
 954          * SNonce will still be used to avoid changing PTK. */
 955         sm->renew_snonce = 1;
 956
 957         if (key_info & WPA_KEY_INFO_INSTALL) {
 958                 if (wpa_supplicant_install_ptk(sm, key))
 959                         goto failed;
 960         }
 961
 962         if (key_info & WPA_KEY_INFO_SECURE) {
 963                 wpa_sm_mlme_setprotection(
 964                         sm, sm->bssid, MLME_SETPROTECTION_PROTECT_TYPE_RX,
 965                         MLME_SETPROTECTION_KEY_TYPE_PAIRWISE);
 966                 eapol_sm_notify_portValid(sm->eapol, TRUE);
 967         }
 968         wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE);
 969
 970         if (ie.gtk &&
 971             wpa_supplicant_pairwise_gtk(sm, key,
 972                                         ie.gtk, ie.gtk_len, key_info) < 0) {
 973                 wpa_printf(MSG_INFO, "RSN: Failed to configure GTK");
 974                 goto failed;
 975         }
 976
 977         if (ieee80211w_set_keys(sm, &ie) < 0) {
 978                 wpa_printf(MSG_INFO, "RSN: Failed to configure IGTK");
 979                 goto failed;
 980         }
 981
 982         return;
 983
 984 failed:
 985         wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
 986 }
 987
 988
 989 static int wpa_supplicant_process_1_of_2_rsn(struct wpa_sm *sm,
 990                                              const u8 *keydata,
 991                                              size_t keydatalen,
 992                                              u16 key_info,
 993                                              struct wpa_gtk_data *gd)
 994 {
 995         int maxkeylen;
 996         struct wpa_eapol_ie_parse ie;
 997
 998         wpa_hexdump(MSG_DEBUG, "RSN: msg 1/2 key data", keydata, keydatalen);
 999         wpa_supplicant_parse_ies(keydata, keydatalen, &ie);
1000         if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1001                 wpa_printf(MSG_WARNING, "WPA: GTK IE in unencrypted key data");
1002                 return -1;
1003         }
1004         if (ie.gtk == NULL) {
1005                 wpa_printf(MSG_INFO, "WPA: No GTK IE in Group Key msg 1/2");
1006                 return -1;
1007         }
1008         maxkeylen = gd->gtk_len = ie.gtk_len - 2;
1009
1010         if (wpa_supplicant_check_group_cipher(sm->group_cipher,
1011                                               gd->gtk_len, maxkeylen,
1012                                               &gd->key_rsc_len, &gd->alg))
1013                 return -1;
1014
1015         wpa_hexdump(MSG_DEBUG, "RSN: received GTK in group key handshake",
1016                     ie.gtk, ie.gtk_len);
1017         gd->keyidx = ie.gtk[0] & 0x3;
1018         gd->tx = wpa_supplicant_gtk_tx_bit_workaround(sm,
1019                                                       !!(ie.gtk[0] & BIT(2)));
1020         if (ie.gtk_len - 2 > sizeof(gd->gtk)) {
1021                 wpa_printf(MSG_INFO, "RSN: Too long GTK in GTK IE "
1022                            "(len=%lu)", (unsigned long) ie.gtk_len - 2);
1023                 return -1;
1024         }
1025         os_memcpy(gd->gtk, ie.gtk + 2, ie.gtk_len - 2);
1026
1027         if (ieee80211w_set_keys(sm, &ie) < 0)
1028                 wpa_printf(MSG_INFO, "RSN: Failed to configure IGTK");
1029
1030         return 0;
1031 }
1032
1033
1034 static int wpa_supplicant_process_1_of_2_wpa(struct wpa_sm *sm,
1035                                              const struct wpa_eapol_key *key,
1036                                              size_t keydatalen, int key_info,
1037                                              size_t extra_len, u16 ver,
1038                                              struct wpa_gtk_data *gd)
1039 {
1040         size_t maxkeylen;
1041         u8 ek[32];
1042
1043         gd->gtk_len = WPA_GET_BE16(key->key_length);
1044         maxkeylen = keydatalen;
1045         if (keydatalen > extra_len) {
1046                 wpa_printf(MSG_INFO, "WPA: Truncated EAPOL-Key packet:"
1047                            " key_data_length=%lu > extra_len=%lu",
1048                            (unsigned long) keydatalen,
1049                            (unsigned long) extra_len);
1050                 return -1;
1051         }
1052         if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1053                 if (maxkeylen < 8) {
1054                         wpa_printf(MSG_INFO, "WPA: Too short maxkeylen (%lu)",
1055                                    (unsigned long) maxkeylen);
1056                         return -1;
1057                 }
1058                 maxkeylen -= 8;
1059         }
1060
1061         if (wpa_supplicant_check_group_cipher(sm->group_cipher,
1062                                               gd->gtk_len, maxkeylen,
1063                                               &gd->key_rsc_len, &gd->alg))
1064                 return -1;
1065
1066         gd->keyidx = (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >>
1067                 WPA_KEY_INFO_KEY_INDEX_SHIFT;
1068         if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4) {
1069                 os_memcpy(ek, key->key_iv, 16);
1070                 os_memcpy(ek + 16, sm->ptk.kek, 16);
1071                 if (keydatalen > sizeof(gd->gtk)) {
1072                         wpa_printf(MSG_WARNING, "WPA: RC4 key data "
1073                                    "too long (%lu)",
1074                                    (unsigned long) keydatalen);
1075                         return -1;
1076                 }
1077                 os_memcpy(gd->gtk, key + 1, keydatalen);
1078                 if (rc4_skip(ek, 32, 256, gd->gtk, keydatalen)) {
1079                         wpa_printf(MSG_ERROR, "WPA: RC4 failed");
1080                         return -1;
1081                 }
1082         } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1083                 if (keydatalen % 8) {
1084                         wpa_printf(MSG_WARNING, "WPA: Unsupported AES-WRAP "
1085                                    "len %lu", (unsigned long) keydatalen);
1086                         return -1;
1087                 }
1088                 if (maxkeylen > sizeof(gd->gtk)) {
1089                         wpa_printf(MSG_WARNING, "WPA: AES-WRAP key data "
1090                                    "too long (keydatalen=%lu maxkeylen=%lu)",
1091                                    (unsigned long) keydatalen,
1092                                    (unsigned long) maxkeylen);
1093                         return -1;
1094                 }
1095                 if (aes_unwrap(sm->ptk.kek, maxkeylen / 8,
1096                                (const u8 *) (key + 1), gd->gtk)) {
1097                         wpa_printf(MSG_WARNING, "WPA: AES unwrap "
1098                                    "failed - could not decrypt GTK");
1099                         return -1;
1100                 }
1101         } else {
1102                 wpa_printf(MSG_WARNING, "WPA: Unsupported key_info type %d",
1103                            ver);
1104                 return -1;
1105         }
1106         gd->tx = wpa_supplicant_gtk_tx_bit_workaround(
1107                 sm, !!(key_info & WPA_KEY_INFO_TXRX));
1108         return 0;
1109 }
1110
1111
1112 static int wpa_supplicant_send_2_of_2(struct wpa_sm *sm,
1113                                       const struct wpa_eapol_key *key,
1114                                       int ver, u16 key_info)
1115 {
1116         size_t rlen;
1117         struct wpa_eapol_key *reply;
1118         u8 *rbuf;
1119
1120         rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
1121                                   sizeof(*reply), &rlen, (void *) &reply);
1122         if (rbuf == NULL)
1123                 return -1;
1124
1125         reply->type = sm->proto == WPA_PROTO_RSN ?
1126                 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1127         key_info &= WPA_KEY_INFO_KEY_INDEX_MASK;
1128         key_info |= ver | WPA_KEY_INFO_MIC | WPA_KEY_INFO_SECURE;
1129         WPA_PUT_BE16(reply->key_info, key_info);
1130         if (sm->proto == WPA_PROTO_RSN)
1131                 WPA_PUT_BE16(reply->key_length, 0);
1132         else
1133                 os_memcpy(reply->key_length, key->key_length, 2);
1134         os_memcpy(reply->replay_counter, key->replay_counter,
1135                   WPA_REPLAY_COUNTER_LEN);
1136
1137         WPA_PUT_BE16(reply->key_data_length, 0);
1138
1139         wpa_printf(MSG_DEBUG, "WPA: Sending EAPOL-Key 2/2");
1140         wpa_eapol_key_send(sm, sm->ptk.kck, ver, sm->bssid, ETH_P_EAPOL,
1141                            rbuf, rlen, reply->key_mic);
1142
1143         return 0;
1144 }
1145
1146
1147 static void wpa_supplicant_process_1_of_2(struct wpa_sm *sm,
1148                                           const unsigned char *src_addr,
1149                                           const struct wpa_eapol_key *key,
1150                                           int extra_len, u16 ver)
1151 {
1152         u16 key_info, keydatalen;
1153         int rekey, ret;
1154         struct wpa_gtk_data gd;
1155
1156         os_memset(&gd, 0, sizeof(gd));
1157
1158         rekey = wpa_sm_get_state(sm) == WPA_COMPLETED;
1159         wpa_printf(MSG_DEBUG, "WPA: RX message 1 of Group Key Handshake from "
1160                    MACSTR " (ver=%d)", MAC2STR(src_addr), ver);
1161
1162         key_info = WPA_GET_BE16(key->key_info);
1163         keydatalen = WPA_GET_BE16(key->key_data_length);
1164
1165         if (sm->proto == WPA_PROTO_RSN) {
1166                 ret = wpa_supplicant_process_1_of_2_rsn(sm,
1167                                                         (const u8 *) (key + 1),
1168                                                         keydatalen, key_info,
1169                                                         &gd);
1170         } else {
1171                 ret = wpa_supplicant_process_1_of_2_wpa(sm, key, keydatalen,
1172                                                         key_info, extra_len,
1173                                                         ver, &gd);
1174         }
1175
1176         wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE);
1177
1178         if (ret)
1179                 goto failed;
1180
1181         if (wpa_supplicant_install_gtk(sm, &gd, key->key_rsc) ||
1182             wpa_supplicant_send_2_of_2(sm, key, ver, key_info))
1183                 goto failed;
1184
1185         if (rekey) {
1186                 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, "WPA: Group rekeying "
1187                         "completed with " MACSTR " [GTK=%s]",
1188                         MAC2STR(sm->bssid), wpa_cipher_txt(sm->group_cipher));
1189                 wpa_sm_cancel_auth_timeout(sm);
1190                 wpa_sm_set_state(sm, WPA_COMPLETED);
1191         } else {
1192                 wpa_supplicant_key_neg_complete(sm, sm->bssid,
1193                                                 key_info &
1194                                                 WPA_KEY_INFO_SECURE);
1195         }
1196         return;
1197
1198 failed:
1199         wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
1200 }
1201
1202
1203 static int wpa_supplicant_verify_eapol_key_mic(struct wpa_sm *sm,
1204                                                struct wpa_eapol_key *key,
1205                                                u16 ver,
1206                                                const u8 *buf, size_t len)
1207 {
1208         u8 mic[16];
1209         int ok = 0;
1210
1211         os_memcpy(mic, key->key_mic, 16);
1212         if (sm->tptk_set) {
1213                 os_memset(key->key_mic, 0, 16);
1214                 wpa_eapol_key_mic(sm->tptk.kck, ver, buf, len,
1215                                   key->key_mic);
1216                 if (os_memcmp(mic, key->key_mic, 16) != 0) {
1217                         wpa_printf(MSG_WARNING, "WPA: Invalid EAPOL-Key MIC "
1218                                    "when using TPTK - ignoring TPTK");
1219                 } else {
1220                         ok = 1;
1221                         sm->tptk_set = 0;
1222                         sm->ptk_set = 1;
1223                         os_memcpy(&sm->ptk, &sm->tptk, sizeof(sm->ptk));
1224                 }
1225         }
1226
1227         if (!ok && sm->ptk_set) {
1228                 os_memset(key->key_mic, 0, 16);
1229                 wpa_eapol_key_mic(sm->ptk.kck, ver, buf, len,
1230                                   key->key_mic);
1231                 if (os_memcmp(mic, key->key_mic, 16) != 0) {
1232                         wpa_printf(MSG_WARNING, "WPA: Invalid EAPOL-Key MIC "
1233                                    "- dropping packet");
1234                         return -1;
1235                 }
1236                 ok = 1;
1237         }
1238
1239         if (!ok) {
1240                 wpa_printf(MSG_WARNING, "WPA: Could not verify EAPOL-Key MIC "
1241                            "- dropping packet");
1242                 return -1;
1243         }
1244
1245         os_memcpy(sm->rx_replay_counter, key->replay_counter,
1246                   WPA_REPLAY_COUNTER_LEN);
1247         sm->rx_replay_counter_set = 1;
1248         return 0;
1249 }
1250
1251
1252 /* Decrypt RSN EAPOL-Key key data (RC4 or AES-WRAP) */
1253 static int wpa_supplicant_decrypt_key_data(struct wpa_sm *sm,
1254                                            struct wpa_eapol_key *key, u16 ver)
1255 {
1256         u16 keydatalen = WPA_GET_BE16(key->key_data_length);
1257
1258         wpa_hexdump(MSG_DEBUG, "RSN: encrypted key data",
1259                     (u8 *) (key + 1), keydatalen);
1260         if (!sm->ptk_set) {
1261                 wpa_printf(MSG_WARNING, "WPA: PTK not available, "
1262                            "cannot decrypt EAPOL-Key key data.");
1263                 return -1;
1264         }
1265
1266         /* Decrypt key data here so that this operation does not need
1267          * to be implemented separately for each message type. */
1268         if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4) {
1269                 u8 ek[32];
1270                 os_memcpy(ek, key->key_iv, 16);
1271                 os_memcpy(ek + 16, sm->ptk.kek, 16);
1272                 if (rc4_skip(ek, 32, 256, (u8 *) (key + 1), keydatalen)) {
1273                         wpa_printf(MSG_ERROR, "WPA: RC4 failed");
1274                         return -1;
1275                 }
1276         } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1277                    ver == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1278                 u8 *buf;
1279                 if (keydatalen % 8) {
1280                         wpa_printf(MSG_WARNING, "WPA: Unsupported "
1281                                    "AES-WRAP len %d", keydatalen);
1282                         return -1;
1283                 }
1284                 keydatalen -= 8; /* AES-WRAP adds 8 bytes */
1285                 buf = os_malloc(keydatalen);
1286                 if (buf == NULL) {
1287                         wpa_printf(MSG_WARNING, "WPA: No memory for "
1288                                    "AES-UNWRAP buffer");
1289                         return -1;
1290                 }
1291                 if (aes_unwrap(sm->ptk.kek, keydatalen / 8,
1292                                (u8 *) (key + 1), buf)) {
1293                         os_free(buf);
1294                         wpa_printf(MSG_WARNING, "WPA: AES unwrap failed - "
1295                                    "could not decrypt EAPOL-Key key data");
1296                         return -1;
1297                 }
1298                 os_memcpy(key + 1, buf, keydatalen);
1299                 os_free(buf);
1300                 WPA_PUT_BE16(key->key_data_length, keydatalen);
1301         } else {
1302                 wpa_printf(MSG_WARNING, "WPA: Unsupported key_info type %d",
1303                            ver);
1304                 return -1;
1305         }
1306         wpa_hexdump_key(MSG_DEBUG, "WPA: decrypted EAPOL-Key key data",
1307                         (u8 *) (key + 1), keydatalen);
1308         return 0;
1309 }
1310
1311
1312 /**
1313  * wpa_sm_aborted_cached - Notify WPA that PMKSA caching was aborted
1314  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1315  */
1316 void wpa_sm_aborted_cached(struct wpa_sm *sm)
1317 {
1318         if (sm && sm->cur_pmksa) {
1319                 wpa_printf(MSG_DEBUG, "RSN: Cancelling PMKSA caching attempt");
1320                 sm->cur_pmksa = NULL;
1321         }
1322 }
1323
1324
1325 static void wpa_eapol_key_dump(const struct wpa_eapol_key *key)
1326 {
1327 #ifndef CONFIG_NO_STDOUT_DEBUG
1328         u16 key_info = WPA_GET_BE16(key->key_info);
1329
1330         wpa_printf(MSG_DEBUG, "  EAPOL-Key type=%d", key->type);
1331         wpa_printf(MSG_DEBUG, "  key_info 0x%x (ver=%d keyidx=%d rsvd=%d %s"
1332                    "%s%s%s%s%s%s%s)",
1333                    key_info, key_info & WPA_KEY_INFO_TYPE_MASK,
1334                    (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >>
1335                    WPA_KEY_INFO_KEY_INDEX_SHIFT,
1336                    (key_info & (BIT(13) | BIT(14) | BIT(15))) >> 13,
1337                    key_info & WPA_KEY_INFO_KEY_TYPE ? "Pairwise" : "Group",
1338                    key_info & WPA_KEY_INFO_INSTALL ? " Install" : "",
1339                    key_info & WPA_KEY_INFO_ACK ? " Ack" : "",
1340                    key_info & WPA_KEY_INFO_MIC ? " MIC" : "",
1341                    key_info & WPA_KEY_INFO_SECURE ? " Secure" : "",
1342                    key_info & WPA_KEY_INFO_ERROR ? " Error" : "",
1343                    key_info & WPA_KEY_INFO_REQUEST ? " Request" : "",
1344                    key_info & WPA_KEY_INFO_ENCR_KEY_DATA ? " Encr" : "");
1345         wpa_printf(MSG_DEBUG, "  key_length=%u key_data_length=%u",
1346                    WPA_GET_BE16(key->key_length),
1347                    WPA_GET_BE16(key->key_data_length));
1348         wpa_hexdump(MSG_DEBUG, "  replay_counter",
1349                     key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1350         wpa_hexdump(MSG_DEBUG, "  key_nonce", key->key_nonce, WPA_NONCE_LEN);
1351         wpa_hexdump(MSG_DEBUG, "  key_iv", key->key_iv, 16);
1352         wpa_hexdump(MSG_DEBUG, "  key_rsc", key->key_rsc, 8);
1353         wpa_hexdump(MSG_DEBUG, "  key_id (reserved)", key->key_id, 8);
1354         wpa_hexdump(MSG_DEBUG, "  key_mic", key->key_mic, 16);
1355 #endif /* CONFIG_NO_STDOUT_DEBUG */
1356 }
1357
1358
1359 /**
1360  * wpa_sm_rx_eapol - Process received WPA EAPOL frames
1361  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1362  * @src_addr: Source MAC address of the EAPOL packet
1363  * @buf: Pointer to the beginning of the EAPOL data (EAPOL header)
1364  * @len: Length of the EAPOL frame
1365  * Returns: 1 = WPA EAPOL-Key processed, 0 = not a WPA EAPOL-Key, -1 failure
1366  *
1367  * This function is called for each received EAPOL frame. Other than EAPOL-Key
1368  * frames can be skipped if filtering is done elsewhere. wpa_sm_rx_eapol() is
1369  * only processing WPA and WPA2 EAPOL-Key frames.
1370  *
1371  * The received EAPOL-Key packets are validated and valid packets are replied
1372  * to. In addition, key material (PTK, GTK) is configured at the end of a
1373  * successful key handshake.
1374  */
1375 int wpa_sm_rx_eapol(struct wpa_sm *sm, const u8 *src_addr,
1376                     const u8 *buf, size_t len)
1377 {
1378         size_t plen, data_len, extra_len;
1379         struct ieee802_1x_hdr *hdr;
1380         struct wpa_eapol_key *key;
1381         u16 key_info, ver;
1382         u8 *tmp;
1383         int ret = -1;
1384         struct wpa_peerkey *peerkey = NULL;
1385
1386 #ifdef CONFIG_IEEE80211R
1387         sm->ft_completed = 0;
1388 #endif /* CONFIG_IEEE80211R */
1389
1390         if (len < sizeof(*hdr) + sizeof(*key)) {
1391                 wpa_printf(MSG_DEBUG, "WPA: EAPOL frame too short to be a WPA "
1392                            "EAPOL-Key (len %lu, expecting at least %lu)",
1393                            (unsigned long) len,
1394                            (unsigned long) sizeof(*hdr) + sizeof(*key));
1395                 return 0;
1396         }
1397
1398         tmp = os_malloc(len);
1399         if (tmp == NULL)
1400                 return -1;
1401         os_memcpy(tmp, buf, len);
1402
1403         hdr = (struct ieee802_1x_hdr *) tmp;
1404         key = (struct wpa_eapol_key *) (hdr + 1);
1405         plen = be_to_host16(hdr->length);
1406         data_len = plen + sizeof(*hdr);
1407         wpa_printf(MSG_DEBUG, "IEEE 802.1X RX: version=%d type=%d length=%lu",
1408                    hdr->version, hdr->type, (unsigned long) plen);
1409
1410         if (hdr->version < EAPOL_VERSION) {
1411                 /* TODO: backwards compatibility */
1412         }
1413         if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
1414                 wpa_printf(MSG_DEBUG, "WPA: EAPOL frame (type %u) discarded, "
1415                         "not a Key frame", hdr->type);
1416                 ret = 0;
1417                 goto out;
1418         }
1419         if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
1420                 wpa_printf(MSG_DEBUG, "WPA: EAPOL frame payload size %lu "
1421                            "invalid (frame size %lu)",
1422                            (unsigned long) plen, (unsigned long) len);
1423                 ret = 0;
1424                 goto out;
1425         }
1426
1427         if (key->type != EAPOL_KEY_TYPE_WPA && key->type != EAPOL_KEY_TYPE_RSN)
1428         {
1429                 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key type (%d) unknown, "
1430                            "discarded", key->type);
1431                 ret = 0;
1432                 goto out;
1433         }
1434         wpa_eapol_key_dump(key);
1435
1436         eapol_sm_notify_lower_layer_success(sm->eapol, 0);
1437         wpa_hexdump(MSG_MSGDUMP, "WPA: RX EAPOL-Key", tmp, len);
1438         if (data_len < len) {
1439                 wpa_printf(MSG_DEBUG, "WPA: ignoring %lu bytes after the IEEE "
1440                            "802.1X data", (unsigned long) len - data_len);
1441         }
1442         key_info = WPA_GET_BE16(key->key_info);
1443         ver = key_info & WPA_KEY_INFO_TYPE_MASK;
1444         if (ver != WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 &&
1445 #if defined(CONFIG_IEEE80211R) || defined(CONFIG_IEEE80211W)
1446             ver != WPA_KEY_INFO_TYPE_AES_128_CMAC &&
1447 #endif /* CONFIG_IEEE80211R || CONFIG_IEEE80211W */
1448             ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1449                 wpa_printf(MSG_INFO, "WPA: Unsupported EAPOL-Key descriptor "
1450                            "version %d.", ver);
1451                 goto out;
1452         }
1453
1454 #ifdef CONFIG_IEEE80211R
1455         if (wpa_key_mgmt_ft(sm->key_mgmt)) {
1456                 /* IEEE 802.11r uses a new key_info type (AES-128-CMAC). */
1457                 if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1458                         wpa_printf(MSG_INFO, "FT: AP did not use "
1459                                    "AES-128-CMAC.");
1460                         goto out;
1461                 }
1462         } else
1463 #endif /* CONFIG_IEEE80211R */
1464 #ifdef CONFIG_IEEE80211W
1465         if (wpa_key_mgmt_sha256(sm->key_mgmt)) {
1466                 if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1467                         wpa_printf(MSG_INFO, "WPA: AP did not use the "
1468                                    "negotiated AES-128-CMAC.");
1469                         goto out;
1470                 }
1471         } else
1472 #endif /* CONFIG_IEEE80211W */
1473         if (sm->pairwise_cipher == WPA_CIPHER_CCMP &&
1474             ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1475                 wpa_printf(MSG_INFO, "WPA: CCMP is used, but EAPOL-Key "
1476                            "descriptor version (%d) is not 2.", ver);
1477                 if (sm->group_cipher != WPA_CIPHER_CCMP &&
1478                     !(key_info & WPA_KEY_INFO_KEY_TYPE)) {
1479                         /* Earlier versions of IEEE 802.11i did not explicitly
1480                          * require version 2 descriptor for all EAPOL-Key
1481                          * packets, so allow group keys to use version 1 if
1482                          * CCMP is not used for them. */
1483                         wpa_printf(MSG_INFO, "WPA: Backwards compatibility: "
1484                                    "allow invalid version for non-CCMP group "
1485                                    "keys");
1486                 } else
1487                         goto out;
1488         }
1489
1490 #ifdef CONFIG_PEERKEY
1491         for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) {
1492                 if (os_memcmp(peerkey->addr, src_addr, ETH_ALEN) == 0)
1493                         break;
1494         }
1495
1496         if (!(key_info & WPA_KEY_INFO_SMK_MESSAGE) && peerkey) {
1497                 if (!peerkey->initiator && peerkey->replay_counter_set &&
1498                     os_memcmp(key->replay_counter, peerkey->replay_counter,
1499                               WPA_REPLAY_COUNTER_LEN) <= 0) {
1500                         wpa_printf(MSG_WARNING, "RSN: EAPOL-Key Replay "
1501                                    "Counter did not increase (STK) - dropping "
1502                                    "packet");
1503                         goto out;
1504                 } else if (peerkey->initiator) {
1505                         u8 _tmp[WPA_REPLAY_COUNTER_LEN];
1506                         os_memcpy(_tmp, key->replay_counter,
1507                                   WPA_REPLAY_COUNTER_LEN);
1508                         inc_byte_array(_tmp, WPA_REPLAY_COUNTER_LEN);
1509                         if (os_memcmp(_tmp, peerkey->replay_counter,
1510                                       WPA_REPLAY_COUNTER_LEN) != 0) {
1511                                 wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key Replay "
1512                                            "Counter did not match (STK) - "
1513                                            "dropping packet");
1514                                 goto out;
1515                         }
1516                 }
1517         }
1518
1519         if (peerkey && peerkey->initiator && (key_info & WPA_KEY_INFO_ACK)) {
1520                 wpa_printf(MSG_INFO, "RSN: Ack bit in key_info from STK peer");
1521                 goto out;
1522         }
1523 #endif /* CONFIG_PEERKEY */
1524
1525         if (!peerkey && sm->rx_replay_counter_set &&
1526             os_memcmp(key->replay_counter, sm->rx_replay_counter,
1527                       WPA_REPLAY_COUNTER_LEN) <= 0) {
1528                 wpa_printf(MSG_WARNING, "WPA: EAPOL-Key Replay Counter did not"
1529                            " increase - dropping packet");
1530                 goto out;
1531         }
1532
1533         if (!(key_info & (WPA_KEY_INFO_ACK | WPA_KEY_INFO_SMK_MESSAGE))
1534 #ifdef CONFIG_PEERKEY
1535             && (peerkey == NULL || !peerkey->initiator)
1536 #endif /* CONFIG_PEERKEY */
1537                 ) {
1538                 wpa_printf(MSG_INFO, "WPA: No Ack bit in key_info");
1539                 goto out;
1540         }
1541
1542         if (key_info & WPA_KEY_INFO_REQUEST) {
1543                 wpa_printf(MSG_INFO, "WPA: EAPOL-Key with Request bit - "
1544                            "dropped");
1545                 goto out;
1546         }
1547
1548         if ((key_info & WPA_KEY_INFO_MIC) && !peerkey &&
1549             wpa_supplicant_verify_eapol_key_mic(sm, key, ver, tmp, data_len))
1550                 goto out;
1551
1552 #ifdef CONFIG_PEERKEY
1553         if ((key_info & WPA_KEY_INFO_MIC) && peerkey &&
1554             peerkey_verify_eapol_key_mic(sm, peerkey, key, ver, tmp, data_len))
1555                 goto out;
1556 #endif /* CONFIG_PEERKEY */
1557
1558         extra_len = data_len - sizeof(*hdr) - sizeof(*key);
1559
1560         if (WPA_GET_BE16(key->key_data_length) > extra_len) {
1561                 wpa_msg(sm->ctx->msg_ctx, MSG_INFO, "WPA: Invalid EAPOL-Key "
1562                         "frame - key_data overflow (%d > %lu)",
1563                         WPA_GET_BE16(key->key_data_length),
1564                         (unsigned long) extra_len);
1565                 goto out;
1566         }
1567         extra_len = WPA_GET_BE16(key->key_data_length);
1568
1569         if (sm->proto == WPA_PROTO_RSN &&
1570             (key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1571                 if (wpa_supplicant_decrypt_key_data(sm, key, ver))
1572                         goto out;
1573                 extra_len = WPA_GET_BE16(key->key_data_length);
1574         }
1575
1576         if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1577                 if (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) {
1578                         wpa_printf(MSG_WARNING, "WPA: Ignored EAPOL-Key "
1579                                    "(Pairwise) with non-zero key index");
1580                         goto out;
1581                 }
1582                 if (peerkey) {
1583                         /* PeerKey 4-Way Handshake */
1584                         peerkey_rx_eapol_4way(sm, peerkey, key, key_info, ver);
1585                 } else if (key_info & WPA_KEY_INFO_MIC) {
1586                         /* 3/4 4-Way Handshake */
1587                         wpa_supplicant_process_3_of_4(sm, key, ver);
1588                 } else {
1589                         /* 1/4 4-Way Handshake */
1590                         wpa_supplicant_process_1_of_4(sm, src_addr, key,
1591                                                       ver);
1592                 }
1593         } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
1594                 /* PeerKey SMK Handshake */
1595                 peerkey_rx_eapol_smk(sm, src_addr, key, extra_len, key_info,
1596                                      ver);
1597         } else {
1598                 if (key_info & WPA_KEY_INFO_MIC) {
1599                         /* 1/2 Group Key Handshake */
1600                         wpa_supplicant_process_1_of_2(sm, src_addr, key,
1601                                                       extra_len, ver);
1602                 } else {
1603                         wpa_printf(MSG_WARNING, "WPA: EAPOL-Key (Group) "
1604                                    "without Mic bit - dropped");
1605                 }
1606         }
1607
1608         ret = 1;
1609
1610 out:
1611         os_free(tmp);
1612         return ret;
1613 }
1614
1615
1616 #ifdef CONFIG_CTRL_IFACE
1617 static int wpa_cipher_bits(int cipher)
1618 {
1619         switch (cipher) {
1620         case WPA_CIPHER_CCMP:
1621                 return 128;
1622         case WPA_CIPHER_TKIP:
1623                 return 256;
1624         case WPA_CIPHER_WEP104:
1625                 return 104;
1626         case WPA_CIPHER_WEP40:
1627                 return 40;
1628         default:
1629                 return 0;
1630         }
1631 }
1632
1633
1634 static u32 wpa_key_mgmt_suite(struct wpa_sm *sm)
1635 {
1636         switch (sm->key_mgmt) {
1637         case WPA_KEY_MGMT_IEEE8021X:
1638                 return (sm->proto == WPA_PROTO_RSN ?
1639                         RSN_AUTH_KEY_MGMT_UNSPEC_802_1X :
1640                         WPA_AUTH_KEY_MGMT_UNSPEC_802_1X);
1641         case WPA_KEY_MGMT_PSK:
1642                 return (sm->proto == WPA_PROTO_RSN ?
1643                         RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X :
1644                         WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X);
1645 #ifdef CONFIG_IEEE80211R
1646         case WPA_KEY_MGMT_FT_IEEE8021X:
1647                 return RSN_AUTH_KEY_MGMT_FT_802_1X;
1648         case WPA_KEY_MGMT_FT_PSK:
1649                 return RSN_AUTH_KEY_MGMT_FT_PSK;
1650 #endif /* CONFIG_IEEE80211R */
1651 #ifdef CONFIG_IEEE80211W
1652         case WPA_KEY_MGMT_IEEE8021X_SHA256:
1653                 return RSN_AUTH_KEY_MGMT_802_1X_SHA256;
1654         case WPA_KEY_MGMT_PSK_SHA256:
1655                 return RSN_AUTH_KEY_MGMT_PSK_SHA256;
1656 #endif /* CONFIG_IEEE80211W */
1657         case WPA_KEY_MGMT_WPA_NONE:
1658                 return WPA_AUTH_KEY_MGMT_NONE;
1659         default:
1660                 return 0;
1661         }
1662 }
1663
1664
1665 static u32 wpa_cipher_suite(struct wpa_sm *sm, int cipher)
1666 {
1667         switch (cipher) {
1668         case WPA_CIPHER_CCMP:
1669                 return (sm->proto == WPA_PROTO_RSN ?
1670                         RSN_CIPHER_SUITE_CCMP : WPA_CIPHER_SUITE_CCMP);
1671         case WPA_CIPHER_TKIP:
1672                 return (sm->proto == WPA_PROTO_RSN ?
1673                         RSN_CIPHER_SUITE_TKIP : WPA_CIPHER_SUITE_TKIP);
1674         case WPA_CIPHER_WEP104:
1675                 return (sm->proto == WPA_PROTO_RSN ?
1676                         RSN_CIPHER_SUITE_WEP104 : WPA_CIPHER_SUITE_WEP104);
1677         case WPA_CIPHER_WEP40:
1678                 return (sm->proto == WPA_PROTO_RSN ?
1679                         RSN_CIPHER_SUITE_WEP40 : WPA_CIPHER_SUITE_WEP40);
1680         case WPA_CIPHER_NONE:
1681                 return (sm->proto == WPA_PROTO_RSN ?
1682                         RSN_CIPHER_SUITE_NONE : WPA_CIPHER_SUITE_NONE);
1683         default:
1684                 return 0;
1685         }
1686 }
1687
1688
1689 #define RSN_SUITE "%02x-%02x-%02x-%d"
1690 #define RSN_SUITE_ARG(s) \
1691 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
1692
1693 /**
1694  * wpa_sm_get_mib - Dump text list of MIB entries
1695  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1696  * @buf: Buffer for the list
1697  * @buflen: Length of the buffer
1698  * Returns: Number of bytes written to buffer
1699  *
1700  * This function is used fetch dot11 MIB variables.
1701  */
1702 int wpa_sm_get_mib(struct wpa_sm *sm, char *buf, size_t buflen)
1703 {
1704         char pmkid_txt[PMKID_LEN * 2 + 1];
1705         int rsna, ret;
1706         size_t len;
1707
1708         if (sm->cur_pmksa) {
1709                 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
1710                                  sm->cur_pmksa->pmkid, PMKID_LEN);
1711         } else
1712                 pmkid_txt[0] = '\0';
1713
1714         if ((wpa_key_mgmt_wpa_psk(sm->key_mgmt) ||
1715              wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt)) &&
1716             sm->proto == WPA_PROTO_RSN)
1717                 rsna = 1;
1718         else
1719                 rsna = 0;
1720
1721         ret = os_snprintf(buf, buflen,
1722                           "dot11RSNAOptionImplemented=TRUE\n"
1723                           "dot11RSNAPreauthenticationImplemented=TRUE\n"
1724                           "dot11RSNAEnabled=%s\n"
1725                           "dot11RSNAPreauthenticationEnabled=%s\n"
1726                           "dot11RSNAConfigVersion=%d\n"
1727                           "dot11RSNAConfigPairwiseKeysSupported=5\n"
1728                           "dot11RSNAConfigGroupCipherSize=%d\n"
1729                           "dot11RSNAConfigPMKLifetime=%d\n"
1730                           "dot11RSNAConfigPMKReauthThreshold=%d\n"
1731                           "dot11RSNAConfigNumberOfPTKSAReplayCounters=1\n"
1732                           "dot11RSNAConfigSATimeout=%d\n",
1733                           rsna ? "TRUE" : "FALSE",
1734                           rsna ? "TRUE" : "FALSE",
1735                           RSN_VERSION,
1736                           wpa_cipher_bits(sm->group_cipher),
1737                           sm->dot11RSNAConfigPMKLifetime,
1738                           sm->dot11RSNAConfigPMKReauthThreshold,
1739                           sm->dot11RSNAConfigSATimeout);
1740         if (ret < 0 || (size_t) ret >= buflen)
1741                 return 0;
1742         len = ret;
1743
1744         ret = os_snprintf(
1745                 buf + len, buflen - len,
1746                 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
1747                 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
1748                 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
1749                 "dot11RSNAPMKIDUsed=%s\n"
1750                 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
1751                 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
1752                 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
1753                 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n"
1754                 "dot11RSNA4WayHandshakeFailures=%u\n",
1755                 RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)),
1756                 RSN_SUITE_ARG(wpa_cipher_suite(sm, sm->pairwise_cipher)),
1757                 RSN_SUITE_ARG(wpa_cipher_suite(sm, sm->group_cipher)),
1758                 pmkid_txt,
1759                 RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)),
1760                 RSN_SUITE_ARG(wpa_cipher_suite(sm, sm->pairwise_cipher)),
1761                 RSN_SUITE_ARG(wpa_cipher_suite(sm, sm->group_cipher)),
1762                 sm->dot11RSNA4WayHandshakeFailures);
1763         if (ret >= 0 && (size_t) ret < buflen)
1764                 len += ret;
1765
1766         return (int) len;
1767 }
1768 #endif /* CONFIG_CTRL_IFACE */
1769
1770
1771 static void wpa_sm_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
1772                                  void *ctx, int replace)
1773 {
1774         struct wpa_sm *sm = ctx;
1775
1776         if (sm->cur_pmksa == entry ||
1777             (sm->pmk_len == entry->pmk_len &&
1778              os_memcmp(sm->pmk, entry->pmk, sm->pmk_len) == 0)) {
1779                 wpa_printf(MSG_DEBUG, "RSN: removed current PMKSA entry");
1780                 sm->cur_pmksa = NULL;
1781
1782                 if (replace) {
1783                         /* A new entry is being added, so no need to
1784                          * deauthenticate in this case. This happens when EAP
1785                          * authentication is completed again (reauth or failed
1786                          * PMKSA caching attempt). */
1787                         return;
1788                 }
1789
1790                 os_memset(sm->pmk, 0, sizeof(sm->pmk));
1791                 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
1792         }
1793 }
1794
1795
1796 /**
1797  * wpa_sm_init - Initialize WPA state machine
1798  * @ctx: Context pointer for callbacks; this needs to be an allocated buffer
1799  * Returns: Pointer to the allocated WPA state machine data
1800  *
1801  * This function is used to allocate a new WPA state machine and the returned
1802  * value is passed to all WPA state machine calls.
1803  */
1804 struct wpa_sm * wpa_sm_init(struct wpa_sm_ctx *ctx)
1805 {
1806         struct wpa_sm *sm;
1807
1808         sm = os_zalloc(sizeof(*sm));
1809         if (sm == NULL)
1810                 return NULL;
1811         sm->renew_snonce = 1;
1812         sm->ctx = ctx;
1813
1814         sm->dot11RSNAConfigPMKLifetime = 43200;
1815         sm->dot11RSNAConfigPMKReauthThreshold = 70;
1816         sm->dot11RSNAConfigSATimeout = 60;
1817
1818         sm->pmksa = pmksa_cache_init(wpa_sm_pmksa_free_cb, sm, sm);
1819         if (sm->pmksa == NULL) {
1820                 wpa_printf(MSG_ERROR, "RSN: PMKSA cache initialization "
1821                            "failed");
1822                 os_free(sm);
1823                 return NULL;
1824         }
1825
1826         return sm;
1827 }
1828
1829
1830 /**
1831  * wpa_sm_deinit - Deinitialize WPA state machine
1832  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1833  */
1834 void wpa_sm_deinit(struct wpa_sm *sm)
1835 {
1836         if (sm == NULL)
1837                 return;
1838         pmksa_cache_deinit(sm->pmksa);
1839         eloop_cancel_timeout(wpa_sm_start_preauth, sm, NULL);
1840         eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL);
1841         os_free(sm->assoc_wpa_ie);
1842         os_free(sm->ap_wpa_ie);
1843         os_free(sm->ap_rsn_ie);
1844         os_free(sm->ctx);
1845         peerkey_deinit(sm);
1846         os_free(sm);
1847 }
1848
1849
1850 /**
1851  * wpa_sm_notify_assoc - Notify WPA state machine about association
1852  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1853  * @bssid: The BSSID of the new association
1854  *
1855  * This function is called to let WPA state machine know that the connection
1856  * was established.
1857  */
1858 void wpa_sm_notify_assoc(struct wpa_sm *sm, const u8 *bssid)
1859 {
1860         int clear_ptk = 1;
1861
1862         if (sm == NULL)
1863                 return;
1864
1865         wpa_printf(MSG_DEBUG, "WPA: Association event - clear replay counter");
1866         os_memcpy(sm->bssid, bssid, ETH_ALEN);
1867         os_memset(sm->rx_replay_counter, 0, WPA_REPLAY_COUNTER_LEN);
1868         sm->rx_replay_counter_set = 0;
1869         sm->renew_snonce = 1;
1870         if (os_memcmp(sm->preauth_bssid, bssid, ETH_ALEN) == 0)
1871                 rsn_preauth_deinit(sm);
1872
1873 #ifdef CONFIG_IEEE80211R
1874         if (wpa_ft_is_completed(sm)) {
1875                 wpa_supplicant_key_neg_complete(sm, sm->bssid, 1);
1876
1877                 /* Prepare for the next transition */
1878                 wpa_ft_prepare_auth_request(sm);
1879
1880                 clear_ptk = 0;
1881         }
1882 #endif /* CONFIG_IEEE80211R */
1883
1884         if (clear_ptk) {
1885                 /*
1886                  * IEEE 802.11, 8.4.10: Delete PTK SA on (re)association if
1887                  * this is not part of a Fast BSS Transition.
1888                  */
1889                 wpa_printf(MSG_DEBUG, "WPA: Clear old PTK");
1890                 sm->ptk_set = 0;
1891                 sm->tptk_set = 0;
1892         }
1893 }
1894
1895
1896 /**
1897  * wpa_sm_notify_disassoc - Notify WPA state machine about disassociation
1898  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1899  *
1900  * This function is called to let WPA state machine know that the connection
1901  * was lost. This will abort any existing pre-authentication session.
1902  */
1903 void wpa_sm_notify_disassoc(struct wpa_sm *sm)
1904 {
1905         rsn_preauth_deinit(sm);
1906         if (wpa_sm_get_state(sm) == WPA_4WAY_HANDSHAKE)
1907                 sm->dot11RSNA4WayHandshakeFailures++;
1908 }
1909
1910
1911 /**
1912  * wpa_sm_set_pmk - Set PMK
1913  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1914  * @pmk: The new PMK
1915  * @pmk_len: The length of the new PMK in bytes
1916  *
1917  * Configure the PMK for WPA state machine.
1918  */
1919 void wpa_sm_set_pmk(struct wpa_sm *sm, const u8 *pmk, size_t pmk_len)
1920 {
1921         if (sm == NULL)
1922                 return;
1923
1924         sm->pmk_len = pmk_len;
1925         os_memcpy(sm->pmk, pmk, pmk_len);
1926
1927 #ifdef CONFIG_IEEE80211R
1928         /* Set XXKey to be PSK for FT key derivation */
1929         sm->xxkey_len = pmk_len;
1930         os_memcpy(sm->xxkey, pmk, pmk_len);
1931 #endif /* CONFIG_IEEE80211R */
1932 }
1933
1934
1935 /**
1936  * wpa_sm_set_pmk_from_pmksa - Set PMK based on the current PMKSA
1937  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1938  *
1939  * Take the PMK from the current PMKSA into use. If no PMKSA is active, the PMK
1940  * will be cleared.
1941  */
1942 void wpa_sm_set_pmk_from_pmksa(struct wpa_sm *sm)
1943 {
1944         if (sm == NULL)
1945                 return;
1946
1947         if (sm->cur_pmksa) {
1948                 sm->pmk_len = sm->cur_pmksa->pmk_len;
1949                 os_memcpy(sm->pmk, sm->cur_pmksa->pmk, sm->pmk_len);
1950         } else {
1951                 sm->pmk_len = PMK_LEN;
1952                 os_memset(sm->pmk, 0, PMK_LEN);
1953         }
1954 }
1955
1956
1957 /**
1958  * wpa_sm_set_fast_reauth - Set fast reauthentication (EAP) enabled/disabled
1959  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1960  * @fast_reauth: Whether fast reauthentication (EAP) is allowed
1961  */
1962 void wpa_sm_set_fast_reauth(struct wpa_sm *sm, int fast_reauth)
1963 {
1964         if (sm)
1965                 sm->fast_reauth = fast_reauth;
1966 }
1967
1968
1969 /**
1970  * wpa_sm_set_scard_ctx - Set context pointer for smartcard callbacks
1971  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1972  * @scard_ctx: Context pointer for smartcard related callback functions
1973  */
1974 void wpa_sm_set_scard_ctx(struct wpa_sm *sm, void *scard_ctx)
1975 {
1976         if (sm == NULL)
1977                 return;
1978         sm->scard_ctx = scard_ctx;
1979         if (sm->preauth_eapol)
1980                 eapol_sm_register_scard_ctx(sm->preauth_eapol, scard_ctx);
1981 }
1982
1983
1984 /**
1985  * wpa_sm_set_config - Notification of current configration change
1986  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1987  * @config: Pointer to current network configuration
1988  *
1989  * Notify WPA state machine that configuration has changed. config will be
1990  * stored as a backpointer to network configuration. This can be %NULL to clear
1991  * the stored pointed.
1992  */
1993 void wpa_sm_set_config(struct wpa_sm *sm, struct rsn_supp_config *config)
1994 {
1995         if (!sm)
1996                 return;
1997
1998         if (config) {
1999                 sm->network_ctx = config->network_ctx;
2000                 sm->peerkey_enabled = config->peerkey_enabled;
2001                 sm->allowed_pairwise_cipher = config->allowed_pairwise_cipher;
2002                 sm->proactive_key_caching = config->proactive_key_caching;
2003                 sm->eap_workaround = config->eap_workaround;
2004                 sm->eap_conf_ctx = config->eap_conf_ctx;
2005                 if (config->ssid) {
2006                         os_memcpy(sm->ssid, config->ssid, config->ssid_len);
2007                         sm->ssid_len = config->ssid_len;
2008                 } else
2009                         sm->ssid_len = 0;
2010                 sm->wpa_ptk_rekey = config->wpa_ptk_rekey;
2011         } else {
2012                 sm->network_ctx = NULL;
2013                 sm->peerkey_enabled = 0;
2014                 sm->allowed_pairwise_cipher = 0;
2015                 sm->proactive_key_caching = 0;
2016                 sm->eap_workaround = 0;
2017                 sm->eap_conf_ctx = NULL;
2018                 sm->ssid_len = 0;
2019                 sm->wpa_ptk_rekey = 0;
2020         }
2021         if (config == NULL || config->network_ctx != sm->network_ctx)
2022                 pmksa_cache_notify_reconfig(sm->pmksa);
2023 }
2024
2025
2026 /**
2027  * wpa_sm_set_own_addr - Set own MAC address
2028  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2029  * @addr: Own MAC address
2030  */
2031 void wpa_sm_set_own_addr(struct wpa_sm *sm, const u8 *addr)
2032 {
2033         if (sm)
2034                 os_memcpy(sm->own_addr, addr, ETH_ALEN);
2035 }
2036
2037
2038 /**
2039  * wpa_sm_set_ifname - Set network interface name
2040  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2041  * @ifname: Interface name
2042  * @bridge_ifname: Optional bridge interface name (for pre-auth)
2043  */
2044 void wpa_sm_set_ifname(struct wpa_sm *sm, const char *ifname,
2045                        const char *bridge_ifname)
2046 {
2047         if (sm) {
2048                 sm->ifname = ifname;
2049                 sm->bridge_ifname = bridge_ifname;
2050         }
2051 }
2052
2053
2054 /**
2055  * wpa_sm_set_eapol - Set EAPOL state machine pointer
2056  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2057  * @eapol: Pointer to EAPOL state machine allocated with eapol_sm_init()
2058  */
2059 void wpa_sm_set_eapol(struct wpa_sm *sm, struct eapol_sm *eapol)
2060 {
2061         if (sm)
2062                 sm->eapol = eapol;
2063 }
2064
2065
2066 /**
2067  * wpa_sm_set_param - Set WPA state machine parameters
2068  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2069  * @param: Parameter field
2070  * @value: Parameter value
2071  * Returns: 0 on success, -1 on failure
2072  */
2073 int wpa_sm_set_param(struct wpa_sm *sm, enum wpa_sm_conf_params param,
2074                      unsigned int value)
2075 {
2076         int ret = 0;
2077
2078         if (sm == NULL)
2079                 return -1;
2080
2081         switch (param) {
2082         case RSNA_PMK_LIFETIME:
2083                 if (value > 0)
2084                         sm->dot11RSNAConfigPMKLifetime = value;
2085                 else
2086                         ret = -1;
2087                 break;
2088         case RSNA_PMK_REAUTH_THRESHOLD:
2089                 if (value > 0 && value <= 100)
2090                         sm->dot11RSNAConfigPMKReauthThreshold = value;
2091                 else
2092                         ret = -1;
2093                 break;
2094         case RSNA_SA_TIMEOUT:
2095                 if (value > 0)
2096                         sm->dot11RSNAConfigSATimeout = value;
2097                 else
2098                         ret = -1;
2099                 break;
2100         case WPA_PARAM_PROTO:
2101                 sm->proto = value;
2102                 break;
2103         case WPA_PARAM_PAIRWISE:
2104                 sm->pairwise_cipher = value;
2105                 break;
2106         case WPA_PARAM_GROUP:
2107                 sm->group_cipher = value;
2108                 break;
2109         case WPA_PARAM_KEY_MGMT:
2110                 sm->key_mgmt = value;
2111                 break;
2112 #ifdef CONFIG_IEEE80211W
2113         case WPA_PARAM_MGMT_GROUP:
2114                 sm->mgmt_group_cipher = value;
2115                 break;
2116 #endif /* CONFIG_IEEE80211W */
2117         case WPA_PARAM_RSN_ENABLED:
2118                 sm->rsn_enabled = value;
2119                 break;
2120         default:
2121                 break;
2122         }
2123
2124         return ret;
2125 }
2126
2127
2128 /**
2129  * wpa_sm_get_param - Get WPA state machine parameters
2130  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2131  * @param: Parameter field
2132  * Returns: Parameter value
2133  */
2134 unsigned int wpa_sm_get_param(struct wpa_sm *sm, enum wpa_sm_conf_params param)
2135 {
2136         if (sm == NULL)
2137                 return 0;
2138
2139         switch (param) {
2140         case RSNA_PMK_LIFETIME:
2141                 return sm->dot11RSNAConfigPMKLifetime;
2142         case RSNA_PMK_REAUTH_THRESHOLD:
2143                 return sm->dot11RSNAConfigPMKReauthThreshold;
2144         case RSNA_SA_TIMEOUT:
2145                 return sm->dot11RSNAConfigSATimeout;
2146         case WPA_PARAM_PROTO:
2147                 return sm->proto;
2148         case WPA_PARAM_PAIRWISE:
2149                 return sm->pairwise_cipher;
2150         case WPA_PARAM_GROUP:
2151                 return sm->group_cipher;
2152         case WPA_PARAM_KEY_MGMT:
2153                 return sm->key_mgmt;
2154 #ifdef CONFIG_IEEE80211W
2155         case WPA_PARAM_MGMT_GROUP:
2156                 return sm->mgmt_group_cipher;
2157 #endif /* CONFIG_IEEE80211W */
2158         case WPA_PARAM_RSN_ENABLED:
2159                 return sm->rsn_enabled;
2160         default:
2161                 return 0;
2162         }
2163 }
2164
2165
2166 /**
2167  * wpa_sm_get_status - Get WPA state machine
2168  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2169  * @buf: Buffer for status information
2170  * @buflen: Maximum buffer length
2171  * @verbose: Whether to include verbose status information
2172  * Returns: Number of bytes written to buf.
2173  *
2174  * Query WPA state machine for status information. This function fills in
2175  * a text area with current status information. If the buffer (buf) is not
2176  * large enough, status information will be truncated to fit the buffer.
2177  */
2178 int wpa_sm_get_status(struct wpa_sm *sm, char *buf, size_t buflen,
2179                       int verbose)
2180 {
2181         char *pos = buf, *end = buf + buflen;
2182         int ret;
2183
2184         ret = os_snprintf(pos, end - pos,
2185                           "pairwise_cipher=%s\n"
2186                           "group_cipher=%s\n"
2187                           "key_mgmt=%s\n",
2188                           wpa_cipher_txt(sm->pairwise_cipher),
2189                           wpa_cipher_txt(sm->group_cipher),
2190                           wpa_key_mgmt_txt(sm->key_mgmt, sm->proto));
2191         if (ret < 0 || ret >= end - pos)
2192                 return pos - buf;
2193         pos += ret;
2194         return pos - buf;
2195 }
2196
2197
2198 /**
2199  * wpa_sm_set_assoc_wpa_ie_default - Generate own WPA/RSN IE from configuration
2200  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2201  * @wpa_ie: Pointer to buffer for WPA/RSN IE
2202  * @wpa_ie_len: Pointer to the length of the wpa_ie buffer
2203  * Returns: 0 on success, -1 on failure
2204  */
2205 int wpa_sm_set_assoc_wpa_ie_default(struct wpa_sm *sm, u8 *wpa_ie,
2206                                     size_t *wpa_ie_len)
2207 {
2208         int res;
2209
2210         if (sm == NULL)
2211                 return -1;
2212
2213         res = wpa_gen_wpa_ie(sm, wpa_ie, *wpa_ie_len);
2214         if (res < 0)
2215                 return -1;
2216         *wpa_ie_len = res;
2217
2218         wpa_hexdump(MSG_DEBUG, "WPA: Set own WPA IE default",
2219                     wpa_ie, *wpa_ie_len);
2220
2221         if (sm->assoc_wpa_ie == NULL) {
2222                 /*
2223                  * Make a copy of the WPA/RSN IE so that 4-Way Handshake gets
2224                  * the correct version of the IE even if PMKSA caching is
2225                  * aborted (which would remove PMKID from IE generation).
2226                  */
2227                 sm->assoc_wpa_ie = os_malloc(*wpa_ie_len);
2228                 if (sm->assoc_wpa_ie == NULL)
2229                         return -1;
2230
2231                 os_memcpy(sm->assoc_wpa_ie, wpa_ie, *wpa_ie_len);
2232                 sm->assoc_wpa_ie_len = *wpa_ie_len;
2233         }
2234
2235         return 0;
2236 }
2237
2238
2239 /**
2240  * wpa_sm_set_assoc_wpa_ie - Set own WPA/RSN IE from (Re)AssocReq
2241  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2242  * @ie: Pointer to IE data (starting from id)
2243  * @len: IE length
2244  * Returns: 0 on success, -1 on failure
2245  *
2246  * Inform WPA state machine about the WPA/RSN IE used in (Re)Association
2247  * Request frame. The IE will be used to override the default value generated
2248  * with wpa_sm_set_assoc_wpa_ie_default().
2249  */
2250 int wpa_sm_set_assoc_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len)
2251 {
2252         if (sm == NULL)
2253                 return -1;
2254
2255         os_free(sm->assoc_wpa_ie);
2256         if (ie == NULL || len == 0) {
2257                 wpa_printf(MSG_DEBUG, "WPA: clearing own WPA/RSN IE");
2258                 sm->assoc_wpa_ie = NULL;
2259                 sm->assoc_wpa_ie_len = 0;
2260         } else {
2261                 wpa_hexdump(MSG_DEBUG, "WPA: set own WPA/RSN IE", ie, len);
2262                 sm->assoc_wpa_ie = os_malloc(len);
2263                 if (sm->assoc_wpa_ie == NULL)
2264                         return -1;
2265
2266                 os_memcpy(sm->assoc_wpa_ie, ie, len);
2267                 sm->assoc_wpa_ie_len = len;
2268         }
2269
2270         return 0;
2271 }
2272
2273
2274 /**
2275  * wpa_sm_set_ap_wpa_ie - Set AP WPA IE from Beacon/ProbeResp
2276  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2277  * @ie: Pointer to IE data (starting from id)
2278  * @len: IE length
2279  * Returns: 0 on success, -1 on failure
2280  *
2281  * Inform WPA state machine about the WPA IE used in Beacon / Probe Response
2282  * frame.
2283  */
2284 int wpa_sm_set_ap_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len)
2285 {
2286         if (sm == NULL)
2287                 return -1;
2288
2289         os_free(sm->ap_wpa_ie);
2290         if (ie == NULL || len == 0) {
2291                 wpa_printf(MSG_DEBUG, "WPA: clearing AP WPA IE");
2292                 sm->ap_wpa_ie = NULL;
2293                 sm->ap_wpa_ie_len = 0;
2294         } else {
2295                 wpa_hexdump(MSG_DEBUG, "WPA: set AP WPA IE", ie, len);
2296                 sm->ap_wpa_ie = os_malloc(len);
2297                 if (sm->ap_wpa_ie == NULL)
2298                         return -1;
2299
2300                 os_memcpy(sm->ap_wpa_ie, ie, len);
2301                 sm->ap_wpa_ie_len = len;
2302         }
2303
2304         return 0;
2305 }
2306
2307
2308 /**
2309  * wpa_sm_set_ap_rsn_ie - Set AP RSN IE from Beacon/ProbeResp
2310  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2311  * @ie: Pointer to IE data (starting from id)
2312  * @len: IE length
2313  * Returns: 0 on success, -1 on failure
2314  *
2315  * Inform WPA state machine about the RSN IE used in Beacon / Probe Response
2316  * frame.
2317  */
2318 int wpa_sm_set_ap_rsn_ie(struct wpa_sm *sm, const u8 *ie, size_t len)
2319 {
2320         if (sm == NULL)
2321                 return -1;
2322
2323         os_free(sm->ap_rsn_ie);
2324         if (ie == NULL || len == 0) {
2325                 wpa_printf(MSG_DEBUG, "WPA: clearing AP RSN IE");
2326                 sm->ap_rsn_ie = NULL;
2327                 sm->ap_rsn_ie_len = 0;
2328         } else {
2329                 wpa_hexdump(MSG_DEBUG, "WPA: set AP RSN IE", ie, len);
2330                 sm->ap_rsn_ie = os_malloc(len);
2331                 if (sm->ap_rsn_ie == NULL)
2332                         return -1;
2333
2334                 os_memcpy(sm->ap_rsn_ie, ie, len);
2335                 sm->ap_rsn_ie_len = len;
2336         }
2337
2338         return 0;
2339 }
2340
2341
2342 /**
2343  * wpa_sm_parse_own_wpa_ie - Parse own WPA/RSN IE
2344  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2345  * @data: Pointer to data area for parsing results
2346  * Returns: 0 on success, -1 if IE is not known, or -2 on parsing failure
2347  *
2348  * Parse the contents of the own WPA or RSN IE from (Re)AssocReq and write the
2349  * parsed data into data.
2350  */
2351 int wpa_sm_parse_own_wpa_ie(struct wpa_sm *sm, struct wpa_ie_data *data)
2352 {
2353         if (sm == NULL || sm->assoc_wpa_ie == NULL) {
2354                 wpa_printf(MSG_DEBUG, "WPA: No WPA/RSN IE available from "
2355                            "association info");
2356                 return -1;
2357         }
2358         if (wpa_parse_wpa_ie(sm->assoc_wpa_ie, sm->assoc_wpa_ie_len, data))
2359                 return -2;
2360         return 0;
2361 }
2362
2363
2364 int wpa_sm_pmksa_cache_list(struct wpa_sm *sm, char *buf, size_t len)
2365 {
2366 #ifndef CONFIG_NO_WPA2
2367         return pmksa_cache_list(sm->pmksa, buf, len);
2368 #else /* CONFIG_NO_WPA2 */
2369         return -1;
2370 #endif /* CONFIG_NO_WPA2 */
2371 }