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 "rc4.h"
  19 #include "aes_wrap.h"
  20 #include "wpa.h"
  21 #include "eloop.h"
  22 #include "eapol_supp/eapol_supp_sm.h"
  23 #include "preauth.h"
  24 #include "pmksa_cache.h"
  25 #include "wpa_i.h"
  26 #include "wpa_ie.h"
  27 #include "peerkey.h"
  28 #include "ieee802_11_defs.h"
  29
  30
  31 /**
  32  * wpa_cipher_txt - Convert cipher suite to a text string
  33  * @cipher: Cipher suite (WPA_CIPHER_* enum)
  34  * Returns: Pointer to a text string of the cipher suite name
  35  */
  36 static const char * wpa_cipher_txt(int cipher)
  37 {
  38         switch (cipher) {
  39         case WPA_CIPHER_NONE:
  40                 return "NONE";
  41         case WPA_CIPHER_WEP40:
  42                 return "WEP-40";
  43         case WPA_CIPHER_WEP104:
  44                 return "WEP-104";
  45         case WPA_CIPHER_TKIP:
  46                 return "TKIP";
  47         case WPA_CIPHER_CCMP:
  48                 return "CCMP";
  49         default:
  50                 return "UNKNOWN";
  51         }
  52 }
  53
  54
  55 /**
  56  * wpa_key_mgmt_txt - Convert key management suite to a text string
  57  * @key_mgmt: Key management suite (WPA_KEY_MGMT_* enum)
  58  * @proto: WPA/WPA2 version (WPA_PROTO_*)
  59  * Returns: Pointer to a text string of the key management suite name
  60  */
  61 static const char * wpa_key_mgmt_txt(int key_mgmt, int proto)
  62 {
  63         switch (key_mgmt) {
  64         case WPA_KEY_MGMT_IEEE8021X:
  65                 return proto == WPA_PROTO_RSN ?
  66                         "WPA2/IEEE 802.1X/EAP" : "WPA/IEEE 802.1X/EAP";
  67         case WPA_KEY_MGMT_PSK:
  68                 return proto == WPA_PROTO_RSN ?
  69                         "WPA2-PSK" : "WPA-PSK";
  70         case WPA_KEY_MGMT_NONE:
  71                 return "NONE";
  72         case WPA_KEY_MGMT_IEEE8021X_NO_WPA:
  73                 return "IEEE 802.1X (no WPA)";
  74 #ifdef CONFIG_IEEE80211R
  75         case WPA_KEY_MGMT_FT_IEEE8021X:
  76                 return "FT-EAP";
  77         case WPA_KEY_MGMT_FT_PSK:
  78                 return "FT-PSK";
  79 #endif /* CONFIG_IEEE80211R */
  80 #ifdef CONFIG_IEEE80211W
  81         case WPA_KEY_MGMT_IEEE8021X_SHA256:
  82                 return "WPA2-EAP-SHA256";
  83         case WPA_KEY_MGMT_PSK_SHA256:
  84                 return "WPA2-PSK-SHA256";
  85 #endif /* CONFIG_IEEE80211W */
  86         default:
  87                 return "UNKNOWN";
  88         }
  89 }
  90
  91
  92 /**
  93  * wpa_eapol_key_send - Send WPA/RSN EAPOL-Key message
  94  * @sm: Pointer to WPA state machine data from wpa_sm_init()
  95  * @kck: Key Confirmation Key (KCK, part of PTK)
  96  * @ver: Version field from Key Info
  97  * @dest: Destination address for the frame
  98  * @proto: Ethertype (usually ETH_P_EAPOL)
  99  * @msg: EAPOL-Key message
 100  * @msg_len: Length of message
 101  * @key_mic: Pointer to the buffer to which the EAPOL-Key MIC is written
 102  */
 103 void wpa_eapol_key_send(struct wpa_sm *sm, const u8 *kck,
 104                         int ver, const u8 *dest, u16 proto,
 105                         u8 *msg, size_t msg_len, u8 *key_mic)
 106 {
 107         if (is_zero_ether_addr(dest) && is_zero_ether_addr(sm->bssid)) {
 108                 /*
 109                  * Association event was not yet received; try to fetch
 110                  * BSSID from the driver.
 111                  */
 112                 if (wpa_sm_get_bssid(sm, sm->bssid) < 0) {
 113                         wpa_printf(MSG_DEBUG, "WPA: Failed to read BSSID for "
 114                                    "EAPOL-Key destination address");
 115                 } else {
 116                         dest = sm->bssid;
 117                         wpa_printf(MSG_DEBUG, "WPA: Use BSSID (" MACSTR
 118                                    ") as the destination for EAPOL-Key",
 119                                    MAC2STR(dest));
 120                 }
 121         }
 122         if (key_mic)
 123                 wpa_eapol_key_mic(kck, ver, msg, msg_len, key_mic);
 124         wpa_hexdump(MSG_MSGDUMP, "WPA: TX EAPOL-Key", msg, msg_len);
 125         wpa_sm_ether_send(sm, dest, proto, msg, msg_len);
 126         eapol_sm_notify_tx_eapol_key(sm->eapol);
 127         os_free(msg);
 128 }
 129
 130
 131 /**
 132  * wpa_sm_key_request - Send EAPOL-Key Request
 133  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 134  * @error: Indicate whether this is an Michael MIC error report
 135  * @pairwise: 1 = error report for pairwise packet, 0 = for group packet
 136  *
 137  * Send an EAPOL-Key Request to the current authenticator. This function is
 138  * used to request rekeying and it is usually called when a local Michael MIC
 139  * failure is detected.
 140  */
 141 void wpa_sm_key_request(struct wpa_sm *sm, int error, int pairwise)
 142 {
 143         size_t rlen;
 144         struct wpa_eapol_key *reply;
 145         int key_info, ver;
 146         u8 bssid[ETH_ALEN], *rbuf;
 147
 148         if (wpa_key_mgmt_ft(sm->key_mgmt) || wpa_key_mgmt_sha256(sm->key_mgmt))
 149                 ver = WPA_KEY_INFO_TYPE_AES_128_CMAC;
 150         else if (sm->pairwise_cipher == WPA_CIPHER_CCMP)
 151                 ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
 152         else
 153                 ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
 154
 155         if (wpa_sm_get_bssid(sm, bssid) < 0) {
 156                 wpa_printf(MSG_WARNING, "Failed to read BSSID for EAPOL-Key "
 157                            "request");
 158                 return;
 159         }
 160
 161         rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
 162                                   sizeof(*reply), &rlen, (void *) &reply);
 163         if (rbuf == NULL)
 164                 return;
 165
 166         reply->type = sm->proto == WPA_PROTO_RSN ?
 167                 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
 168         key_info = WPA_KEY_INFO_REQUEST | ver;
 169         if (sm->ptk_set)
 170                 key_info |= WPA_KEY_INFO_MIC;
 171         if (error)
 172                 key_info |= WPA_KEY_INFO_ERROR;
 173         if (pairwise)
 174                 key_info |= WPA_KEY_INFO_KEY_TYPE;
 175         WPA_PUT_BE16(reply->key_info, key_info);
 176         WPA_PUT_BE16(reply->key_length, 0);
 177         os_memcpy(reply->replay_counter, sm->request_counter,
 178                   WPA_REPLAY_COUNTER_LEN);
 179         inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN);
 180
 181         WPA_PUT_BE16(reply->key_data_length, 0);
 182
 183         wpa_printf(MSG_INFO, "WPA: Sending EAPOL-Key Request (error=%d "
 184                    "pairwise=%d ptk_set=%d len=%lu)",
 185                    error, pairwise, sm->ptk_set, (unsigned long) rlen);
 186         wpa_eapol_key_send(sm, sm->ptk.kck, ver, bssid, ETH_P_EAPOL,
 187                            rbuf, rlen, key_info & WPA_KEY_INFO_MIC ?
 188                            reply->key_mic : NULL);
 189 }
 190
 191
 192 static int wpa_supplicant_get_pmk(struct wpa_sm *sm,
 193                                   const unsigned char *src_addr,
 194                                   const u8 *pmkid)
 195 {
 196         int abort_cached = 0;
 197
 198         if (pmkid && !sm->cur_pmksa) {
 199                 /* When using drivers that generate RSN IE, wpa_supplicant may
 200                  * not have enough time to get the association information
 201                  * event before receiving this 1/4 message, so try to find a
 202                  * matching PMKSA cache entry here. */
 203                 sm->cur_pmksa = pmksa_cache_get(sm->pmksa, src_addr, pmkid);
 204                 if (sm->cur_pmksa) {
 205                         wpa_printf(MSG_DEBUG, "RSN: found matching PMKID from "
 206                                    "PMKSA cache");
 207                 } else {
 208                         wpa_printf(MSG_DEBUG, "RSN: no matching PMKID found");
 209                         abort_cached = 1;
 210                 }
 211         }
 212
 213         if (pmkid && sm->cur_pmksa &&
 214             os_memcmp(pmkid, sm->cur_pmksa->pmkid, PMKID_LEN) == 0) {
 215                 wpa_hexdump(MSG_DEBUG, "RSN: matched PMKID", pmkid, PMKID_LEN);
 216                 wpa_sm_set_pmk_from_pmksa(sm);
 217                 wpa_hexdump_key(MSG_DEBUG, "RSN: PMK from PMKSA cache",
 218                                 sm->pmk, sm->pmk_len);
 219                 eapol_sm_notify_cached(sm->eapol);
 220 #ifdef CONFIG_IEEE80211R
 221                 sm->xxkey_len = 0;
 222 #endif /* CONFIG_IEEE80211R */
 223         } else if (wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt) && sm->eapol) {
 224                 int res, pmk_len;
 225                 pmk_len = PMK_LEN;
 226                 res = eapol_sm_get_key(sm->eapol, sm->pmk, PMK_LEN);
 227                 if (res) {
 228                         /*
 229                          * EAP-LEAP is an exception from other EAP methods: it
 230                          * uses only 16-byte PMK.
 231                          */
 232                         res = eapol_sm_get_key(sm->eapol, sm->pmk, 16);
 233                         pmk_len = 16;
 234                 } else {
 235 #ifdef CONFIG_IEEE80211R
 236                         u8 buf[2 * PMK_LEN];
 237                         if (eapol_sm_get_key(sm->eapol, buf, 2 * PMK_LEN) == 0)
 238                         {
 239                                 os_memcpy(sm->xxkey, buf + PMK_LEN, PMK_LEN);
 240                                 sm->xxkey_len = PMK_LEN;
 241                                 os_memset(buf, 0, sizeof(buf));
 242                         }
 243 #endif /* CONFIG_IEEE80211R */
 244                 }
 245                 if (res == 0) {
 246                         wpa_hexdump_key(MSG_DEBUG, "WPA: PMK from EAPOL state "
 247                                         "machines", sm->pmk, pmk_len);
 248                         sm->pmk_len = pmk_len;
 249                         if (sm->proto == WPA_PROTO_RSN) {
 250                                 pmksa_cache_add(sm->pmksa, sm->pmk, pmk_len,
 251                                                 src_addr, sm->own_addr,
 252                                                 sm->network_ctx, sm->key_mgmt);
 253                         }
 254                         if (!sm->cur_pmksa && pmkid &&
 255                             pmksa_cache_get(sm->pmksa, src_addr, pmkid)) {
 256                                 wpa_printf(MSG_DEBUG, "RSN: the new PMK "
 257                                            "matches with the PMKID");
 258                                 abort_cached = 0;
 259                         }
 260                 } else {
 261                         wpa_msg(sm->ctx->ctx, MSG_WARNING,
 262                                 "WPA: Failed to get master session key from "
 263                                 "EAPOL state machines");
 264                         wpa_msg(sm->ctx->ctx, MSG_WARNING,
 265                                 "WPA: Key handshake aborted");
 266                         if (sm->cur_pmksa) {
 267                                 wpa_printf(MSG_DEBUG, "RSN: Cancelled PMKSA "
 268                                            "caching attempt");
 269                                 sm->cur_pmksa = NULL;
 270                                 abort_cached = 1;
 271                         } else if (!abort_cached) {
 272                                 return -1;
 273                         }
 274                 }
 275         }
 276
 277         if (abort_cached && wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt)) {
 278                 /* Send EAPOL-Start to trigger full EAP authentication. */
 279                 u8 *buf;
 280                 size_t buflen;
 281
 282                 wpa_printf(MSG_DEBUG, "RSN: no PMKSA entry found - trigger "
 283                            "full EAP authentication");
 284                 buf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_START,
 285                                          NULL, 0, &buflen, NULL);
 286                 if (buf) {
 287                         wpa_sm_ether_send(sm, sm->bssid, ETH_P_EAPOL,
 288                                           buf, buflen);
 289                         os_free(buf);
 290                 }
 291
 292                 return -1;
 293         }
 294
 295         return 0;
 296 }
 297
 298
 299 /**
 300  * wpa_supplicant_send_2_of_4 - Send message 2 of WPA/RSN 4-Way Handshake
 301  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 302  * @dst: Destination address for the frame
 303  * @key: Pointer to the EAPOL-Key frame header
 304  * @ver: Version bits from EAPOL-Key Key Info
 305  * @nonce: Nonce value for the EAPOL-Key frame
 306  * @wpa_ie: WPA/RSN IE
 307  * @wpa_ie_len: Length of the WPA/RSN IE
 308  * @ptk: PTK to use for keyed hash and encryption
 309  * Returns: 0 on success, -1 on failure
 310  */
 311 int wpa_supplicant_send_2_of_4(struct wpa_sm *sm, const unsigned char *dst,
 312                                const struct wpa_eapol_key *key,
 313                                int ver, const u8 *nonce,
 314                                const u8 *wpa_ie, size_t wpa_ie_len,
 315                                struct wpa_ptk *ptk)
 316 {
 317         size_t rlen;
 318         struct wpa_eapol_key *reply;
 319         u8 *rbuf;
 320
 321         if (wpa_ie == NULL) {
 322                 wpa_printf(MSG_WARNING, "WPA: No wpa_ie set - cannot "
 323                            "generate msg 2/4");
 324                 return -1;
 325         }
 326
 327         wpa_hexdump(MSG_DEBUG, "WPA: WPA IE for msg 2/4", wpa_ie, wpa_ie_len);
 328
 329         rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY,
 330                                   NULL, sizeof(*reply) + wpa_ie_len,
 331                                   &rlen, (void *) &reply);
 332         if (rbuf == NULL)
 333                 return -1;
 334
 335         reply->type = sm->proto == WPA_PROTO_RSN ?
 336                 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
 337         WPA_PUT_BE16(reply->key_info,
 338                      ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_MIC);
 339         if (sm->proto == WPA_PROTO_RSN)
 340                 WPA_PUT_BE16(reply->key_length, 0);
 341         else
 342                 os_memcpy(reply->key_length, key->key_length, 2);
 343         os_memcpy(reply->replay_counter, key->replay_counter,
 344                   WPA_REPLAY_COUNTER_LEN);
 345
 346         WPA_PUT_BE16(reply->key_data_length, wpa_ie_len);
 347         os_memcpy(reply + 1, wpa_ie, wpa_ie_len);
 348
 349         os_memcpy(reply->key_nonce, nonce, WPA_NONCE_LEN);
 350
 351         wpa_printf(MSG_DEBUG, "WPA: Sending EAPOL-Key 2/4");
 352         wpa_eapol_key_send(sm, ptk->kck, ver, dst, ETH_P_EAPOL,
 353                            rbuf, rlen, reply->key_mic);
 354
 355         return 0;
 356 }
 357
 358
 359 static int wpa_derive_ptk(struct wpa_sm *sm, const unsigned char *src_addr,
 360                           const struct wpa_eapol_key *key,
 361                           struct wpa_ptk *ptk)
 362 {
 363 #ifdef CONFIG_IEEE80211R
 364         if (wpa_key_mgmt_ft(sm->key_mgmt))
 365                 return wpa_derive_ptk_ft(sm, src_addr, key, ptk);
 366 #endif /* CONFIG_IEEE80211R */
 367
 368         wpa_pmk_to_ptk(sm->pmk, sm->pmk_len, "Pairwise key expansion",
 369                        sm->own_addr, sm->bssid, sm->snonce, key->key_nonce,
 370                        (u8 *) ptk, sizeof(*ptk),
 371                        wpa_key_mgmt_sha256(sm->key_mgmt));
 372         return 0;
 373 }
 374
 375
 376 static void wpa_supplicant_process_1_of_4(struct wpa_sm *sm,
 377                                           const unsigned char *src_addr,
 378                                           const struct wpa_eapol_key *key,
 379                                           u16 ver)
 380 {
 381         struct wpa_eapol_ie_parse ie;
 382         struct wpa_ptk *ptk;
 383         u8 buf[8];
 384
 385         if (wpa_sm_get_network_ctx(sm) == NULL) {
 386                 wpa_printf(MSG_WARNING, "WPA: No SSID info found (msg 1 of "
 387                            "4).");
 388                 return;
 389         }
 390
 391         wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE);
 392         wpa_printf(MSG_DEBUG, "WPA: RX message 1 of 4-Way Handshake from "
 393                    MACSTR " (ver=%d)", MAC2STR(src_addr), ver);
 394
 395         os_memset(&ie, 0, sizeof(ie));
 396
 397 #ifndef CONFIG_NO_WPA2
 398         if (sm->proto == WPA_PROTO_RSN) {
 399                 /* RSN: msg 1/4 should contain PMKID for the selected PMK */
 400                 const u8 *_buf = (const u8 *) (key + 1);
 401                 size_t len = WPA_GET_BE16(key->key_data_length);
 402                 wpa_hexdump(MSG_DEBUG, "RSN: msg 1/4 key data", _buf, len);
 403                 wpa_supplicant_parse_ies(_buf, len, &ie);
 404                 if (ie.pmkid) {
 405                         wpa_hexdump(MSG_DEBUG, "RSN: PMKID from "
 406                                     "Authenticator", ie.pmkid, PMKID_LEN);
 407                 }
 408         }
 409 #endif /* CONFIG_NO_WPA2 */
 410
 411         if (wpa_supplicant_get_pmk(sm, src_addr, ie.pmkid))
 412                 return;
 413
 414         if (sm->renew_snonce) {
 415                 if (os_get_random(sm->snonce, WPA_NONCE_LEN)) {
 416                         wpa_msg(sm->ctx->ctx, MSG_WARNING,
 417                                 "WPA: Failed to get random data for SNonce");
 418                         return;
 419                 }
 420                 sm->renew_snonce = 0;
 421                 wpa_hexdump(MSG_DEBUG, "WPA: Renewed SNonce",
 422                             sm->snonce, WPA_NONCE_LEN);
 423         }
 424
 425         /* Calculate PTK which will be stored as a temporary PTK until it has
 426          * been verified when processing message 3/4. */
 427         ptk = &sm->tptk;
 428         wpa_derive_ptk(sm, src_addr, key, ptk);
 429         /* Supplicant: swap tx/rx Mic keys */
 430         os_memcpy(buf, ptk->u.auth.tx_mic_key, 8);
 431         os_memcpy(ptk->u.auth.tx_mic_key, ptk->u.auth.rx_mic_key, 8);
 432         os_memcpy(ptk->u.auth.rx_mic_key, buf, 8);
 433         sm->tptk_set = 1;
 434
 435         if (wpa_supplicant_send_2_of_4(sm, sm->bssid, key, ver, sm->snonce,
 436                                        sm->assoc_wpa_ie, sm->assoc_wpa_ie_len,
 437                                        ptk))
 438                 return;
 439
 440         os_memcpy(sm->anonce, key->key_nonce, WPA_NONCE_LEN);
 441 }
 442
 443
 444 static void wpa_sm_start_preauth(void *eloop_ctx, void *timeout_ctx)
 445 {
 446         struct wpa_sm *sm = eloop_ctx;
 447         rsn_preauth_candidate_process(sm);
 448 }
 449
 450
 451 static void wpa_supplicant_key_neg_complete(struct wpa_sm *sm,
 452                                             const u8 *addr, int secure)
 453 {
 454         wpa_msg(sm->ctx->ctx, MSG_INFO, "WPA: Key negotiation completed with "
 455                 MACSTR " [PTK=%s GTK=%s]", MAC2STR(addr),
 456                 wpa_cipher_txt(sm->pairwise_cipher),
 457                 wpa_cipher_txt(sm->group_cipher));
 458         wpa_sm_cancel_auth_timeout(sm);
 459         wpa_sm_set_state(sm, WPA_COMPLETED);
 460
 461         if (secure) {
 462                 wpa_sm_mlme_setprotection(
 463                         sm, addr, MLME_SETPROTECTION_PROTECT_TYPE_RX_TX,
 464                         MLME_SETPROTECTION_KEY_TYPE_PAIRWISE);
 465                 eapol_sm_notify_portValid(sm->eapol, TRUE);
 466                 if (wpa_key_mgmt_wpa_psk(sm->key_mgmt))
 467                         eapol_sm_notify_eap_success(sm->eapol, TRUE);
 468                 /*
 469                  * Start preauthentication after a short wait to avoid a
 470                  * possible race condition between the data receive and key
 471                  * configuration after the 4-Way Handshake. This increases the
 472                  * likelyhood of the first preauth EAPOL-Start frame getting to
 473                  * the target AP.
 474                  */
 475                 eloop_register_timeout(1, 0, wpa_sm_start_preauth, sm, NULL);
 476         }
 477
 478         if (sm->cur_pmksa && sm->cur_pmksa->opportunistic) {
 479                 wpa_printf(MSG_DEBUG, "RSN: Authenticator accepted "
 480                            "opportunistic PMKSA entry - marking it valid");
 481                 sm->cur_pmksa->opportunistic = 0;
 482         }
 483
 484 #ifdef CONFIG_IEEE80211R
 485         if (wpa_key_mgmt_ft(sm->key_mgmt)) {
 486                 /* Prepare for the next transition */
 487                 wpa_ft_prepare_auth_request(sm);
 488         }
 489 #endif /* CONFIG_IEEE80211R */
 490 }
 491
 492
 493 static void wpa_sm_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
 494 {
 495         struct wpa_sm *sm = eloop_ctx;
 496         wpa_printf(MSG_DEBUG, "WPA: Request PTK rekeying");
 497         wpa_sm_key_request(sm, 0, 1);
 498 }
 499
 500
 501 static int wpa_supplicant_install_ptk(struct wpa_sm *sm,
 502                                       const struct wpa_eapol_key *key)
 503 {
 504         int keylen, rsclen;
 505         wpa_alg alg;
 506         const u8 *key_rsc;
 507         u8 null_rsc[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
 508
 509         wpa_printf(MSG_DEBUG, "WPA: Installing PTK to the driver.");
 510
 511         switch (sm->pairwise_cipher) {
 512         case WPA_CIPHER_CCMP:
 513                 alg = WPA_ALG_CCMP;
 514                 keylen = 16;
 515                 rsclen = 6;
 516                 break;
 517         case WPA_CIPHER_TKIP:
 518                 alg = WPA_ALG_TKIP;
 519                 keylen = 32;
 520                 rsclen = 6;
 521                 break;
 522         case WPA_CIPHER_NONE:
 523                 wpa_printf(MSG_DEBUG, "WPA: Pairwise Cipher Suite: "
 524                            "NONE - do not use pairwise keys");
 525                 return 0;
 526         default:
 527                 wpa_printf(MSG_WARNING, "WPA: Unsupported pairwise cipher %d",
 528                            sm->pairwise_cipher);
 529                 return -1;
 530         }
 531
 532         if (sm->proto == WPA_PROTO_RSN) {
 533                 key_rsc = null_rsc;
 534         } else {
 535                 key_rsc = key->key_rsc;
 536                 wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, rsclen);
 537         }
 538
 539         if (wpa_sm_set_key(sm, alg, sm->bssid, 0, 1, key_rsc, rsclen,
 540                            (u8 *) sm->ptk.tk1, keylen) < 0) {
 541                 wpa_printf(MSG_WARNING, "WPA: Failed to set PTK to the "
 542                            "driver.");
 543                 return -1;
 544         }
 545
 546         if (sm->wpa_ptk_rekey) {
 547                 eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL);
 548                 eloop_register_timeout(sm->wpa_ptk_rekey, 0, wpa_sm_rekey_ptk,
 549                                        sm, NULL);
 550         }
 551
 552         return 0;
 553 }
 554
 555
 556 static int wpa_supplicant_check_group_cipher(int group_cipher,
 557                                              int keylen, int maxkeylen,
 558                                              int *key_rsc_len, wpa_alg *alg)
 559 {
 560         int ret = 0;
 561
 562         switch (group_cipher) {
 563         case WPA_CIPHER_CCMP:
 564                 if (keylen != 16 || maxkeylen < 16) {
 565                         ret = -1;
 566                         break;
 567                 }
 568                 *key_rsc_len = 6;
 569                 *alg = WPA_ALG_CCMP;
 570                 break;
 571         case WPA_CIPHER_TKIP:
 572                 if (keylen != 32 || maxkeylen < 32) {
 573                         ret = -1;
 574                         break;
 575                 }
 576                 *key_rsc_len = 6;
 577                 *alg = WPA_ALG_TKIP;
 578                 break;
 579         case WPA_CIPHER_WEP104:
 580                 if (keylen != 13 || maxkeylen < 13) {
 581                         ret = -1;
 582                         break;
 583                 }
 584                 *key_rsc_len = 0;
 585                 *alg = WPA_ALG_WEP;
 586                 break;
 587         case WPA_CIPHER_WEP40:
 588                 if (keylen != 5 || maxkeylen < 5) {
 589                         ret = -1;
 590                         break;
 591                 }
 592                 *key_rsc_len = 0;
 593                 *alg = WPA_ALG_WEP;
 594                 break;
 595         default:
 596                 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
 597                            group_cipher);
 598                 return -1;
 599         }
 600
 601         if (ret < 0 ) {
 602                 wpa_printf(MSG_WARNING, "WPA: Unsupported %s Group Cipher key "
 603                            "length %d (%d).",
 604                            wpa_cipher_txt(group_cipher), keylen, maxkeylen);
 605         }
 606
 607         return ret;
 608 }
 609
 610
 611 struct wpa_gtk_data {
 612         wpa_alg alg;
 613         int tx, key_rsc_len, keyidx;
 614         u8 gtk[32];
 615         int gtk_len;
 616 };
 617
 618
 619 static int wpa_supplicant_install_gtk(struct wpa_sm *sm,
 620                                       const struct wpa_gtk_data *gd,
 621                                       const u8 *key_rsc)
 622 {
 623         const u8 *_gtk = gd->gtk;
 624         u8 gtk_buf[32];
 625
 626         wpa_hexdump_key(MSG_DEBUG, "WPA: Group Key", gd->gtk, gd->gtk_len);
 627         wpa_printf(MSG_DEBUG, "WPA: Installing GTK to the driver "
 628                    "(keyidx=%d tx=%d len=%d).", gd->keyidx, gd->tx,
 629                    gd->gtk_len);
 630         wpa_hexdump(MSG_DEBUG, "WPA: RSC", key_rsc, gd->key_rsc_len);
 631         if (sm->group_cipher == WPA_CIPHER_TKIP) {
 632                 /* Swap Tx/Rx keys for Michael MIC */
 633                 os_memcpy(gtk_buf, gd->gtk, 16);
 634                 os_memcpy(gtk_buf + 16, gd->gtk + 24, 8);
 635                 os_memcpy(gtk_buf + 24, gd->gtk + 16, 8);
 636                 _gtk = gtk_buf;
 637         }
 638         if (sm->pairwise_cipher == WPA_CIPHER_NONE) {
 639                 if (wpa_sm_set_key(sm, gd->alg,
 640                                    (u8 *) "\xff\xff\xff\xff\xff\xff",
 641                                    gd->keyidx, 1, key_rsc, gd->key_rsc_len,
 642                                    _gtk, gd->gtk_len) < 0) {
 643                         wpa_printf(MSG_WARNING, "WPA: Failed to set "
 644                                    "GTK to the driver (Group only).");
 645                         return -1;
 646                 }
 647         } else if (wpa_sm_set_key(sm, gd->alg,
 648                                   (u8 *) "\xff\xff\xff\xff\xff\xff",
 649                                   gd->keyidx, gd->tx, key_rsc, gd->key_rsc_len,
 650                                   _gtk, gd->gtk_len) < 0) {
 651                 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to "
 652                            "the driver.");
 653                 return -1;
 654         }
 655
 656         return 0;
 657 }
 658
 659
 660 static int wpa_supplicant_gtk_tx_bit_workaround(const struct wpa_sm *sm,
 661                                                 int tx)
 662 {
 663         if (tx && sm->pairwise_cipher != WPA_CIPHER_NONE) {
 664                 /* Ignore Tx bit for GTK if a pairwise key is used. One AP
 665                  * seemed to set this bit (incorrectly, since Tx is only when
 666                  * doing Group Key only APs) and without this workaround, the
 667                  * data connection does not work because wpa_supplicant
 668                  * configured non-zero keyidx to be used for unicast. */
 669                 wpa_printf(MSG_INFO, "WPA: Tx bit set for GTK, but pairwise "
 670                            "keys are used - ignore Tx bit");
 671                 return 0;
 672         }
 673         return tx;
 674 }
 675
 676
 677 static int wpa_supplicant_pairwise_gtk(struct wpa_sm *sm,
 678                                        const struct wpa_eapol_key *key,
 679                                        const u8 *gtk, size_t gtk_len,
 680                                        int key_info)
 681 {
 682 #ifndef CONFIG_NO_WPA2
 683         struct wpa_gtk_data gd;
 684
 685         /*
 686          * IEEE Std 802.11i-2004 - 8.5.2 EAPOL-Key frames - Figure 43x
 687          * GTK KDE format:
 688          * KeyID[bits 0-1], Tx [bit 2], Reserved [bits 3-7]
 689          * Reserved [bits 0-7]
 690          * GTK
 691          */
 692
 693         os_memset(&gd, 0, sizeof(gd));
 694         wpa_hexdump_key(MSG_DEBUG, "RSN: received GTK in pairwise handshake",
 695                         gtk, gtk_len);
 696
 697         if (gtk_len < 2 || gtk_len - 2 > sizeof(gd.gtk))
 698                 return -1;
 699
 700         gd.keyidx = gtk[0] & 0x3;
 701         gd.tx = wpa_supplicant_gtk_tx_bit_workaround(sm,
 702                                                      !!(gtk[0] & BIT(2)));
 703         gtk += 2;
 704         gtk_len -= 2;
 705
 706         os_memcpy(gd.gtk, gtk, gtk_len);
 707         gd.gtk_len = gtk_len;
 708
 709         if (wpa_supplicant_check_group_cipher(sm->group_cipher,
 710                                               gtk_len, gtk_len,
 711                                               &gd.key_rsc_len, &gd.alg) ||
 712             wpa_supplicant_install_gtk(sm, &gd, key->key_rsc)) {
 713                 wpa_printf(MSG_DEBUG, "RSN: Failed to install GTK");
 714                 return -1;
 715         }
 716
 717         wpa_supplicant_key_neg_complete(sm, sm->bssid,
 718                                         key_info & WPA_KEY_INFO_SECURE);
 719         return 0;
 720 #else /* CONFIG_NO_WPA2 */
 721         return -1;
 722 #endif /* CONFIG_NO_WPA2 */
 723 }
 724
 725
 726 static int ieee80211w_set_keys(struct wpa_sm *sm,
 727                                struct wpa_eapol_ie_parse *ie)
 728 {
 729 #ifdef CONFIG_IEEE80211W
 730         if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
 731                 return 0;
 732
 733         if (ie->igtk) {
 734                 const struct wpa_igtk_kde *igtk;
 735                 u16 keyidx;
 736                 if (ie->igtk_len != sizeof(*igtk))
 737                         return -1;
 738                 igtk = (const struct wpa_igtk_kde *) ie->igtk;
 739                 keyidx = WPA_GET_LE16(igtk->keyid);
 740                 wpa_printf(MSG_DEBUG, "WPA: IGTK keyid %d "
 741                            "pn %02x%02x%02x%02x%02x%02x",
 742                            keyidx, MAC2STR(igtk->pn));
 743                 wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK",
 744                                 igtk->igtk, WPA_IGTK_LEN);
 745                 if (keyidx > 4095) {
 746                         wpa_printf(MSG_WARNING, "WPA: Invalid IGTK KeyID %d",
 747                                    keyidx);
 748                         return -1;
 749                 }
 750                 if (wpa_sm_set_key(sm, WPA_ALG_IGTK,
 751                                    (u8 *) "\xff\xff\xff\xff\xff\xff",
 752                                    keyidx, 0, igtk->pn, sizeof(igtk->pn),
 753                                    igtk->igtk, WPA_IGTK_LEN) < 0) {
 754                         wpa_printf(MSG_WARNING, "WPA: Failed to configure IGTK"
 755                                    " to the driver");
 756                         return -1;
 757                 }
 758         }
 759
 760         return 0;
 761 #else /* CONFIG_IEEE80211W */
 762         return 0;
 763 #endif /* CONFIG_IEEE80211W */
 764 }
 765
 766
 767 static void wpa_report_ie_mismatch(struct wpa_sm *sm,
 768                                    const char *reason, const u8 *src_addr,
 769                                    const u8 *wpa_ie, size_t wpa_ie_len,
 770                                    const u8 *rsn_ie, size_t rsn_ie_len)
 771 {
 772         wpa_msg(sm->ctx->ctx, MSG_WARNING, "WPA: %s (src=" MACSTR ")",
 773                 reason, MAC2STR(src_addr));
 774
 775         if (sm->ap_wpa_ie) {
 776                 wpa_hexdump(MSG_INFO, "WPA: WPA IE in Beacon/ProbeResp",
 777                             sm->ap_wpa_ie, sm->ap_wpa_ie_len);
 778         }
 779         if (wpa_ie) {
 780                 if (!sm->ap_wpa_ie) {
 781                         wpa_printf(MSG_INFO, "WPA: No WPA IE in "
 782                                    "Beacon/ProbeResp");
 783                 }
 784                 wpa_hexdump(MSG_INFO, "WPA: WPA IE in 3/4 msg",
 785                             wpa_ie, wpa_ie_len);
 786         }
 787
 788         if (sm->ap_rsn_ie) {
 789                 wpa_hexdump(MSG_INFO, "WPA: RSN IE in Beacon/ProbeResp",
 790                             sm->ap_rsn_ie, sm->ap_rsn_ie_len);
 791         }
 792         if (rsn_ie) {
 793                 if (!sm->ap_rsn_ie) {
 794                         wpa_printf(MSG_INFO, "WPA: No RSN IE in "
 795                                    "Beacon/ProbeResp");
 796                 }
 797                 wpa_hexdump(MSG_INFO, "WPA: RSN IE in 3/4 msg",
 798                             rsn_ie, rsn_ie_len);
 799         }
 800
 801         wpa_sm_disassociate(sm, WLAN_REASON_IE_IN_4WAY_DIFFERS);
 802 }
 803
 804
 805 static int wpa_supplicant_validate_ie(struct wpa_sm *sm,
 806                                       const unsigned char *src_addr,
 807                                       struct wpa_eapol_ie_parse *ie)
 808 {
 809         if (sm->ap_wpa_ie == NULL && sm->ap_rsn_ie == NULL) {
 810                 wpa_printf(MSG_DEBUG, "WPA: No WPA/RSN IE for this AP known. "
 811                            "Trying to get from scan results");
 812                 if (wpa_sm_get_beacon_ie(sm) < 0) {
 813                         wpa_printf(MSG_WARNING, "WPA: Could not find AP from "
 814                                    "the scan results");
 815                 } else {
 816                         wpa_printf(MSG_DEBUG, "WPA: Found the current AP from "
 817                                    "updated scan results");
 818                 }
 819         }
 820
 821         if (ie->wpa_ie == NULL && ie->rsn_ie == NULL &&
 822             (sm->ap_wpa_ie || sm->ap_rsn_ie)) {
 823                 wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match "
 824                                        "with IE in Beacon/ProbeResp (no IE?)",
 825                                        src_addr, ie->wpa_ie, ie->wpa_ie_len,
 826                                        ie->rsn_ie, ie->rsn_ie_len);
 827                 return -1;
 828         }
 829
 830         if ((ie->wpa_ie && sm->ap_wpa_ie &&
 831              (ie->wpa_ie_len != sm->ap_wpa_ie_len ||
 832               os_memcmp(ie->wpa_ie, sm->ap_wpa_ie, ie->wpa_ie_len) != 0)) ||
 833             (ie->rsn_ie && sm->ap_rsn_ie &&
 834              (ie->rsn_ie_len != sm->ap_rsn_ie_len ||
 835               os_memcmp(ie->rsn_ie, sm->ap_rsn_ie, ie->rsn_ie_len) != 0))) {
 836                 wpa_report_ie_mismatch(sm, "IE in 3/4 msg does not match "
 837                                        "with IE in Beacon/ProbeResp",
 838                                        src_addr, ie->wpa_ie, ie->wpa_ie_len,
 839                                        ie->rsn_ie, ie->rsn_ie_len);
 840                 return -1;
 841         }
 842
 843         if (sm->proto == WPA_PROTO_WPA &&
 844             ie->rsn_ie && sm->ap_rsn_ie == NULL && sm->rsn_enabled) {
 845                 wpa_report_ie_mismatch(sm, "Possible downgrade attack "
 846                                        "detected - RSN was enabled and RSN IE "
 847                                        "was in msg 3/4, but not in "
 848                                        "Beacon/ProbeResp",
 849                                        src_addr, ie->wpa_ie, ie->wpa_ie_len,
 850                                        ie->rsn_ie, ie->rsn_ie_len);
 851                 return -1;
 852         }
 853
 854 #ifdef CONFIG_IEEE80211R
 855         if (wpa_key_mgmt_ft(sm->key_mgmt)) {
 856                 struct rsn_mdie *mdie;
 857                 /* TODO: verify that full MDIE matches with the one from scan
 858                  * results, not only mobility domain */
 859                 mdie = (struct rsn_mdie *) (ie->mdie + 2);
 860                 if (ie->mdie == NULL || ie->mdie_len < 2 + sizeof(*mdie) ||
 861                     os_memcmp(mdie->mobility_domain, sm->mobility_domain,
 862                               MOBILITY_DOMAIN_ID_LEN) != 0) {
 863                         wpa_printf(MSG_DEBUG, "FT: MDIE in msg 3/4 did not "
 864                                    "match with the current mobility domain");
 865                         return -1;
 866                 }
 867         }
 868 #endif /* CONFIG_IEEE80211R */
 869
 870         return 0;
 871 }
 872
 873
 874 /**
 875  * wpa_supplicant_send_4_of_4 - Send message 4 of WPA/RSN 4-Way Handshake
 876  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 877  * @dst: Destination address for the frame
 878  * @key: Pointer to the EAPOL-Key frame header
 879  * @ver: Version bits from EAPOL-Key Key Info
 880  * @key_info: Key Info
 881  * @kde: KDEs to include the EAPOL-Key frame
 882  * @kde_len: Length of KDEs
 883  * @ptk: PTK to use for keyed hash and encryption
 884  * Returns: 0 on success, -1 on failure
 885  */
 886 int wpa_supplicant_send_4_of_4(struct wpa_sm *sm, const unsigned char *dst,
 887                                const struct wpa_eapol_key *key,
 888                                u16 ver, u16 key_info,
 889                                const u8 *kde, size_t kde_len,
 890                                struct wpa_ptk *ptk)
 891 {
 892         size_t rlen;
 893         struct wpa_eapol_key *reply;
 894         u8 *rbuf;
 895
 896         if (kde)
 897                 wpa_hexdump(MSG_DEBUG, "WPA: KDE for msg 4/4", kde, kde_len);
 898
 899         rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
 900                                   sizeof(*reply) + kde_len,
 901                                   &rlen, (void *) &reply);
 902         if (rbuf == NULL)
 903                 return -1;
 904
 905         reply->type = sm->proto == WPA_PROTO_RSN ?
 906                 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
 907         key_info &= WPA_KEY_INFO_SECURE;
 908         key_info |= ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_MIC;
 909         WPA_PUT_BE16(reply->key_info, key_info);
 910         if (sm->proto == WPA_PROTO_RSN)
 911                 WPA_PUT_BE16(reply->key_length, 0);
 912         else
 913                 os_memcpy(reply->key_length, key->key_length, 2);
 914         os_memcpy(reply->replay_counter, key->replay_counter,
 915                   WPA_REPLAY_COUNTER_LEN);
 916
 917         WPA_PUT_BE16(reply->key_data_length, kde_len);
 918         if (kde)
 919                 os_memcpy(reply + 1, kde, kde_len);
 920
 921         wpa_printf(MSG_DEBUG, "WPA: Sending EAPOL-Key 4/4");
 922         wpa_eapol_key_send(sm, ptk->kck, ver, dst, ETH_P_EAPOL,
 923                            rbuf, rlen, reply->key_mic);
 924
 925         return 0;
 926 }
 927
 928
 929 static void wpa_supplicant_process_3_of_4(struct wpa_sm *sm,
 930                                           const struct wpa_eapol_key *key,
 931                                           u16 ver)
 932 {
 933         u16 key_info, keylen, len;
 934         const u8 *pos;
 935         struct wpa_eapol_ie_parse ie;
 936
 937         wpa_sm_set_state(sm, WPA_4WAY_HANDSHAKE);
 938         wpa_printf(MSG_DEBUG, "WPA: RX message 3 of 4-Way Handshake from "
 939                    MACSTR " (ver=%d)", MAC2STR(sm->bssid), ver);
 940
 941         key_info = WPA_GET_BE16(key->key_info);
 942
 943         pos = (const u8 *) (key + 1);
 944         len = WPA_GET_BE16(key->key_data_length);
 945         wpa_hexdump(MSG_DEBUG, "WPA: IE KeyData", pos, len);
 946         wpa_supplicant_parse_ies(pos, len, &ie);
 947         if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
 948                 wpa_printf(MSG_WARNING, "WPA: GTK IE in unencrypted key data");
 949                 return;
 950         }
 951 #ifdef CONFIG_IEEE80211W
 952         if (ie.igtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
 953                 wpa_printf(MSG_WARNING, "WPA: IGTK KDE in unencrypted key "
 954                            "data");
 955                 return;
 956         }
 957
 958         if (ie.igtk && ie.igtk_len != sizeof(struct wpa_igtk_kde)) {
 959                 wpa_printf(MSG_WARNING, "WPA: Invalid IGTK KDE length %lu",
 960                            (unsigned long) ie.igtk_len);
 961                 return;
 962         }
 963 #endif /* CONFIG_IEEE80211W */
 964
 965         if (wpa_supplicant_validate_ie(sm, sm->bssid, &ie) < 0)
 966                 return;
 967
 968         if (os_memcmp(sm->anonce, key->key_nonce, WPA_NONCE_LEN) != 0) {
 969                 wpa_printf(MSG_WARNING, "WPA: ANonce from message 1 of 4-Way "
 970                            "Handshake differs from 3 of 4-Way Handshake - drop"
 971                            " packet (src=" MACSTR ")", MAC2STR(sm->bssid));
 972                 return;
 973         }
 974
 975         keylen = WPA_GET_BE16(key->key_length);
 976         switch (sm->pairwise_cipher) {
 977         case WPA_CIPHER_CCMP:
 978                 if (keylen != 16) {
 979                         wpa_printf(MSG_WARNING, "WPA: Invalid CCMP key length "
 980                                    "%d (src=" MACSTR ")",
 981                                    keylen, MAC2STR(sm->bssid));
 982                         return;
 983                 }
 984                 break;
 985         case WPA_CIPHER_TKIP:
 986                 if (keylen != 32) {
 987                         wpa_printf(MSG_WARNING, "WPA: Invalid TKIP key length "
 988                                    "%d (src=" MACSTR ")",
 989                                    keylen, MAC2STR(sm->bssid));
 990                         return;
 991                 }
 992                 break;
 993         }
 994
 995         if (wpa_supplicant_send_4_of_4(sm, sm->bssid, key, ver, key_info,
 996                                        NULL, 0, &sm->ptk))
 997                 return;
 998
 999         /* SNonce was successfully used in msg 3/4, so mark it to be renewed
1000          * for the next 4-Way Handshake. If msg 3 is received again, the old
1001          * SNonce will still be used to avoid changing PTK. */
1002         sm->renew_snonce = 1;
1003
1004         if (key_info & WPA_KEY_INFO_INSTALL) {
1005                 wpa_supplicant_install_ptk(sm, key);
1006         }
1007
1008         if (key_info & WPA_KEY_INFO_SECURE) {
1009                 wpa_sm_mlme_setprotection(
1010                         sm, sm->bssid, MLME_SETPROTECTION_PROTECT_TYPE_RX,
1011                         MLME_SETPROTECTION_KEY_TYPE_PAIRWISE);
1012                 eapol_sm_notify_portValid(sm->eapol, TRUE);
1013         }
1014         wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE);
1015
1016         if (ie.gtk &&
1017             wpa_supplicant_pairwise_gtk(sm, key,
1018                                         ie.gtk, ie.gtk_len, key_info) < 0) {
1019                 wpa_printf(MSG_INFO, "RSN: Failed to configure GTK");
1020         }
1021
1022         if (ieee80211w_set_keys(sm, &ie) < 0)
1023                 wpa_printf(MSG_INFO, "RSN: Failed to configure IGTK");
1024 }
1025
1026
1027 static int wpa_supplicant_process_1_of_2_rsn(struct wpa_sm *sm,
1028                                              const u8 *keydata,
1029                                              size_t keydatalen,
1030                                              u16 key_info,
1031                                              struct wpa_gtk_data *gd)
1032 {
1033         int maxkeylen;
1034         struct wpa_eapol_ie_parse ie;
1035
1036         wpa_hexdump(MSG_DEBUG, "RSN: msg 1/2 key data", keydata, keydatalen);
1037         wpa_supplicant_parse_ies(keydata, keydatalen, &ie);
1038         if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1039                 wpa_printf(MSG_WARNING, "WPA: GTK IE in unencrypted key data");
1040                 return -1;
1041         }
1042         if (ie.gtk == NULL) {
1043                 wpa_printf(MSG_INFO, "WPA: No GTK IE in Group Key msg 1/2");
1044                 return -1;
1045         }
1046         maxkeylen = gd->gtk_len = ie.gtk_len - 2;
1047
1048         if (wpa_supplicant_check_group_cipher(sm->group_cipher,
1049                                               gd->gtk_len, maxkeylen,
1050                                               &gd->key_rsc_len, &gd->alg))
1051                 return -1;
1052
1053         wpa_hexdump(MSG_DEBUG, "RSN: received GTK in group key handshake",
1054                     ie.gtk, ie.gtk_len);
1055         gd->keyidx = ie.gtk[0] & 0x3;
1056         gd->tx = wpa_supplicant_gtk_tx_bit_workaround(sm,
1057                                                       !!(ie.gtk[0] & BIT(2)));
1058         if (ie.gtk_len - 2 > sizeof(gd->gtk)) {
1059                 wpa_printf(MSG_INFO, "RSN: Too long GTK in GTK IE "
1060                            "(len=%lu)", (unsigned long) ie.gtk_len - 2);
1061                 return -1;
1062         }
1063         os_memcpy(gd->gtk, ie.gtk + 2, ie.gtk_len - 2);
1064
1065         if (ieee80211w_set_keys(sm, &ie) < 0)
1066                 wpa_printf(MSG_INFO, "RSN: Failed to configure IGTK");
1067
1068         return 0;
1069 }
1070
1071
1072 static int wpa_supplicant_process_1_of_2_wpa(struct wpa_sm *sm,
1073                                              const struct wpa_eapol_key *key,
1074                                              size_t keydatalen, int key_info,
1075                                              size_t extra_len, u16 ver,
1076                                              struct wpa_gtk_data *gd)
1077 {
1078         size_t maxkeylen;
1079         u8 ek[32];
1080
1081         gd->gtk_len = WPA_GET_BE16(key->key_length);
1082         maxkeylen = keydatalen;
1083         if (keydatalen > extra_len) {
1084                 wpa_printf(MSG_INFO, "WPA: Truncated EAPOL-Key packet:"
1085                            " key_data_length=%lu > extra_len=%lu",
1086                            (unsigned long) keydatalen,
1087                            (unsigned long) extra_len);
1088                 return -1;
1089         }
1090         if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1091                 if (maxkeylen < 8) {
1092                         wpa_printf(MSG_INFO, "WPA: Too short maxkeylen (%lu)",
1093                                    (unsigned long) maxkeylen);
1094                         return -1;
1095                 }
1096                 maxkeylen -= 8;
1097         }
1098
1099         if (wpa_supplicant_check_group_cipher(sm->group_cipher,
1100                                               gd->gtk_len, maxkeylen,
1101                                               &gd->key_rsc_len, &gd->alg))
1102                 return -1;
1103
1104         gd->keyidx = (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >>
1105                 WPA_KEY_INFO_KEY_INDEX_SHIFT;
1106         if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4) {
1107                 os_memcpy(ek, key->key_iv, 16);
1108                 os_memcpy(ek + 16, sm->ptk.kek, 16);
1109                 if (keydatalen > sizeof(gd->gtk)) {
1110                         wpa_printf(MSG_WARNING, "WPA: RC4 key data "
1111                                    "too long (%lu)",
1112                                    (unsigned long) keydatalen);
1113                         return -1;
1114                 }
1115                 os_memcpy(gd->gtk, key + 1, keydatalen);
1116                 rc4_skip(ek, 32, 256, gd->gtk, keydatalen);
1117         } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1118                 if (keydatalen % 8) {
1119                         wpa_printf(MSG_WARNING, "WPA: Unsupported AES-WRAP "
1120                                    "len %lu", (unsigned long) keydatalen);
1121                         return -1;
1122                 }
1123                 if (maxkeylen > sizeof(gd->gtk)) {
1124                         wpa_printf(MSG_WARNING, "WPA: AES-WRAP key data "
1125                                    "too long (keydatalen=%lu maxkeylen=%lu)",
1126                                    (unsigned long) keydatalen,
1127                                    (unsigned long) maxkeylen);
1128                         return -1;
1129                 }
1130                 if (aes_unwrap(sm->ptk.kek, maxkeylen / 8,
1131                                (const u8 *) (key + 1), gd->gtk)) {
1132                         wpa_printf(MSG_WARNING, "WPA: AES unwrap "
1133                                    "failed - could not decrypt GTK");
1134                         return -1;
1135                 }
1136         } else {
1137                 wpa_printf(MSG_WARNING, "WPA: Unsupported key_info type %d",
1138                            ver);
1139                 return -1;
1140         }
1141         gd->tx = wpa_supplicant_gtk_tx_bit_workaround(
1142                 sm, !!(key_info & WPA_KEY_INFO_TXRX));
1143         return 0;
1144 }
1145
1146
1147 static int wpa_supplicant_send_2_of_2(struct wpa_sm *sm,
1148                                       const struct wpa_eapol_key *key,
1149                                       int ver, u16 key_info)
1150 {
1151         size_t rlen;
1152         struct wpa_eapol_key *reply;
1153         u8 *rbuf;
1154
1155         rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
1156                                   sizeof(*reply), &rlen, (void *) &reply);
1157         if (rbuf == NULL)
1158                 return -1;
1159
1160         reply->type = sm->proto == WPA_PROTO_RSN ?
1161                 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1162         key_info &= WPA_KEY_INFO_KEY_INDEX_MASK;
1163         key_info |= ver | WPA_KEY_INFO_MIC | WPA_KEY_INFO_SECURE;
1164         WPA_PUT_BE16(reply->key_info, key_info);
1165         if (sm->proto == WPA_PROTO_RSN)
1166                 WPA_PUT_BE16(reply->key_length, 0);
1167         else
1168                 os_memcpy(reply->key_length, key->key_length, 2);
1169         os_memcpy(reply->replay_counter, key->replay_counter,
1170                   WPA_REPLAY_COUNTER_LEN);
1171
1172         WPA_PUT_BE16(reply->key_data_length, 0);
1173
1174         wpa_printf(MSG_DEBUG, "WPA: Sending EAPOL-Key 2/2");
1175         wpa_eapol_key_send(sm, sm->ptk.kck, ver, sm->bssid, ETH_P_EAPOL,
1176                            rbuf, rlen, reply->key_mic);
1177
1178         return 0;
1179 }
1180
1181
1182 static void wpa_supplicant_process_1_of_2(struct wpa_sm *sm,
1183                                           const unsigned char *src_addr,
1184                                           const struct wpa_eapol_key *key,
1185                                           int extra_len, u16 ver)
1186 {
1187         u16 key_info, keydatalen;
1188         int rekey, ret;
1189         struct wpa_gtk_data gd;
1190
1191         os_memset(&gd, 0, sizeof(gd));
1192
1193         rekey = wpa_sm_get_state(sm) == WPA_COMPLETED;
1194         wpa_printf(MSG_DEBUG, "WPA: RX message 1 of Group Key Handshake from "
1195                    MACSTR " (ver=%d)", MAC2STR(src_addr), ver);
1196
1197         key_info = WPA_GET_BE16(key->key_info);
1198         keydatalen = WPA_GET_BE16(key->key_data_length);
1199
1200         if (sm->proto == WPA_PROTO_RSN) {
1201                 ret = wpa_supplicant_process_1_of_2_rsn(sm,
1202                                                         (const u8 *) (key + 1),
1203                                                         keydatalen, key_info,
1204                                                         &gd);
1205         } else {
1206                 ret = wpa_supplicant_process_1_of_2_wpa(sm, key, keydatalen,
1207                                                         key_info, extra_len,
1208                                                         ver, &gd);
1209         }
1210
1211         wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE);
1212
1213         if (ret)
1214                 return;
1215
1216         if (wpa_supplicant_install_gtk(sm, &gd, key->key_rsc) ||
1217             wpa_supplicant_send_2_of_2(sm, key, ver, key_info))
1218                 return;
1219
1220         if (rekey) {
1221                 wpa_msg(sm->ctx->ctx, MSG_INFO, "WPA: Group rekeying "
1222                         "completed with " MACSTR " [GTK=%s]",
1223                         MAC2STR(sm->bssid), wpa_cipher_txt(sm->group_cipher));
1224                 wpa_sm_cancel_auth_timeout(sm);
1225                 wpa_sm_set_state(sm, WPA_COMPLETED);
1226         } else {
1227                 wpa_supplicant_key_neg_complete(sm, sm->bssid,
1228                                                 key_info &
1229                                                 WPA_KEY_INFO_SECURE);
1230         }
1231 }
1232
1233
1234 static int wpa_supplicant_verify_eapol_key_mic(struct wpa_sm *sm,
1235                                                struct wpa_eapol_key *key,
1236                                                u16 ver,
1237                                                const u8 *buf, size_t len)
1238 {
1239         u8 mic[16];
1240         int ok = 0;
1241
1242         os_memcpy(mic, key->key_mic, 16);
1243         if (sm->tptk_set) {
1244                 os_memset(key->key_mic, 0, 16);
1245                 wpa_eapol_key_mic(sm->tptk.kck, ver, buf, len,
1246                                   key->key_mic);
1247                 if (os_memcmp(mic, key->key_mic, 16) != 0) {
1248                         wpa_printf(MSG_WARNING, "WPA: Invalid EAPOL-Key MIC "
1249                                    "when using TPTK - ignoring TPTK");
1250                 } else {
1251                         ok = 1;
1252                         sm->tptk_set = 0;
1253                         sm->ptk_set = 1;
1254                         os_memcpy(&sm->ptk, &sm->tptk, sizeof(sm->ptk));
1255                 }
1256         }
1257
1258         if (!ok && sm->ptk_set) {
1259                 os_memset(key->key_mic, 0, 16);
1260                 wpa_eapol_key_mic(sm->ptk.kck, ver, buf, len,
1261                                   key->key_mic);
1262                 if (os_memcmp(mic, key->key_mic, 16) != 0) {
1263                         wpa_printf(MSG_WARNING, "WPA: Invalid EAPOL-Key MIC "
1264                                    "- dropping packet");
1265                         return -1;
1266                 }
1267                 ok = 1;
1268         }
1269
1270         if (!ok) {
1271                 wpa_printf(MSG_WARNING, "WPA: Could not verify EAPOL-Key MIC "
1272                            "- dropping packet");
1273                 return -1;
1274         }
1275
1276         os_memcpy(sm->rx_replay_counter, key->replay_counter,
1277                   WPA_REPLAY_COUNTER_LEN);
1278         sm->rx_replay_counter_set = 1;
1279         return 0;
1280 }
1281
1282
1283 /* Decrypt RSN EAPOL-Key key data (RC4 or AES-WRAP) */
1284 static int wpa_supplicant_decrypt_key_data(struct wpa_sm *sm,
1285                                            struct wpa_eapol_key *key, u16 ver)
1286 {
1287         u16 keydatalen = WPA_GET_BE16(key->key_data_length);
1288
1289         wpa_hexdump(MSG_DEBUG, "RSN: encrypted key data",
1290                     (u8 *) (key + 1), keydatalen);
1291         if (!sm->ptk_set) {
1292                 wpa_printf(MSG_WARNING, "WPA: PTK not available, "
1293                            "cannot decrypt EAPOL-Key key data.");
1294                 return -1;
1295         }
1296
1297         /* Decrypt key data here so that this operation does not need
1298          * to be implemented separately for each message type. */
1299         if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4) {
1300                 u8 ek[32];
1301                 os_memcpy(ek, key->key_iv, 16);
1302                 os_memcpy(ek + 16, sm->ptk.kek, 16);
1303                 rc4_skip(ek, 32, 256, (u8 *) (key + 1), keydatalen);
1304         } else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1305                    ver == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1306                 u8 *buf;
1307                 if (keydatalen % 8) {
1308                         wpa_printf(MSG_WARNING, "WPA: Unsupported "
1309                                    "AES-WRAP len %d", keydatalen);
1310                         return -1;
1311                 }
1312                 keydatalen -= 8; /* AES-WRAP adds 8 bytes */
1313                 buf = os_malloc(keydatalen);
1314                 if (buf == NULL) {
1315                         wpa_printf(MSG_WARNING, "WPA: No memory for "
1316                                    "AES-UNWRAP buffer");
1317                         return -1;
1318                 }
1319                 if (aes_unwrap(sm->ptk.kek, keydatalen / 8,
1320                                (u8 *) (key + 1), buf)) {
1321                         os_free(buf);
1322                         wpa_printf(MSG_WARNING, "WPA: AES unwrap failed - "
1323                                    "could not decrypt EAPOL-Key key data");
1324                         return -1;
1325                 }
1326                 os_memcpy(key + 1, buf, keydatalen);
1327                 os_free(buf);
1328                 WPA_PUT_BE16(key->key_data_length, keydatalen);
1329         } else {
1330                 wpa_printf(MSG_WARNING, "WPA: Unsupported key_info type %d",
1331                            ver);
1332                 return -1;
1333         }
1334         wpa_hexdump_key(MSG_DEBUG, "WPA: decrypted EAPOL-Key key data",
1335                         (u8 *) (key + 1), keydatalen);
1336         return 0;
1337 }
1338
1339
1340 /**
1341  * wpa_sm_aborted_cached - Notify WPA that PMKSA caching was aborted
1342  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1343  */
1344 void wpa_sm_aborted_cached(struct wpa_sm *sm)
1345 {
1346         if (sm && sm->cur_pmksa) {
1347                 wpa_printf(MSG_DEBUG, "RSN: Cancelling PMKSA caching attempt");
1348                 sm->cur_pmksa = NULL;
1349         }
1350 }
1351
1352
1353 static void wpa_eapol_key_dump(const struct wpa_eapol_key *key)
1354 {
1355 #ifndef CONFIG_NO_STDOUT_DEBUG
1356         u16 key_info = WPA_GET_BE16(key->key_info);
1357
1358         wpa_printf(MSG_DEBUG, "  EAPOL-Key type=%d", key->type);
1359         wpa_printf(MSG_DEBUG, "  key_info 0x%x (ver=%d keyidx=%d rsvd=%d %s"
1360                    "%s%s%s%s%s%s%s)",
1361                    key_info, key_info & WPA_KEY_INFO_TYPE_MASK,
1362                    (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >>
1363                    WPA_KEY_INFO_KEY_INDEX_SHIFT,
1364                    (key_info & (BIT(13) | BIT(14) | BIT(15))) >> 13,
1365                    key_info & WPA_KEY_INFO_KEY_TYPE ? "Pairwise" : "Group",
1366                    key_info & WPA_KEY_INFO_INSTALL ? " Install" : "",
1367                    key_info & WPA_KEY_INFO_ACK ? " Ack" : "",
1368                    key_info & WPA_KEY_INFO_MIC ? " MIC" : "",
1369                    key_info & WPA_KEY_INFO_SECURE ? " Secure" : "",
1370                    key_info & WPA_KEY_INFO_ERROR ? " Error" : "",
1371                    key_info & WPA_KEY_INFO_REQUEST ? " Request" : "",
1372                    key_info & WPA_KEY_INFO_ENCR_KEY_DATA ? " Encr" : "");
1373         wpa_printf(MSG_DEBUG, "  key_length=%u key_data_length=%u",
1374                    WPA_GET_BE16(key->key_length),
1375                    WPA_GET_BE16(key->key_data_length));
1376         wpa_hexdump(MSG_DEBUG, "  replay_counter",
1377                     key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1378         wpa_hexdump(MSG_DEBUG, "  key_nonce", key->key_nonce, WPA_NONCE_LEN);
1379         wpa_hexdump(MSG_DEBUG, "  key_iv", key->key_iv, 16);
1380         wpa_hexdump(MSG_DEBUG, "  key_rsc", key->key_rsc, 8);
1381         wpa_hexdump(MSG_DEBUG, "  key_id (reserved)", key->key_id, 8);
1382         wpa_hexdump(MSG_DEBUG, "  key_mic", key->key_mic, 16);
1383 #endif /* CONFIG_NO_STDOUT_DEBUG */
1384 }
1385
1386
1387 /**
1388  * wpa_sm_rx_eapol - Process received WPA EAPOL frames
1389  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1390  * @src_addr: Source MAC address of the EAPOL packet
1391  * @buf: Pointer to the beginning of the EAPOL data (EAPOL header)
1392  * @len: Length of the EAPOL frame
1393  * Returns: 1 = WPA EAPOL-Key processed, 0 = not a WPA EAPOL-Key, -1 failure
1394  *
1395  * This function is called for each received EAPOL frame. Other than EAPOL-Key
1396  * frames can be skipped if filtering is done elsewhere. wpa_sm_rx_eapol() is
1397  * only processing WPA and WPA2 EAPOL-Key frames.
1398  *
1399  * The received EAPOL-Key packets are validated and valid packets are replied
1400  * to. In addition, key material (PTK, GTK) is configured at the end of a
1401  * successful key handshake.
1402  */
1403 int wpa_sm_rx_eapol(struct wpa_sm *sm, const u8 *src_addr,
1404                     const u8 *buf, size_t len)
1405 {
1406         size_t plen, data_len, extra_len;
1407         struct ieee802_1x_hdr *hdr;
1408         struct wpa_eapol_key *key;
1409         u16 key_info, ver;
1410         u8 *tmp;
1411         int ret = -1;
1412         struct wpa_peerkey *peerkey = NULL;
1413
1414 #ifdef CONFIG_IEEE80211R
1415         sm->ft_completed = 0;
1416 #endif /* CONFIG_IEEE80211R */
1417
1418         if (len < sizeof(*hdr) + sizeof(*key)) {
1419                 wpa_printf(MSG_DEBUG, "WPA: EAPOL frame too short to be a WPA "
1420                            "EAPOL-Key (len %lu, expecting at least %lu)",
1421                            (unsigned long) len,
1422                            (unsigned long) sizeof(*hdr) + sizeof(*key));
1423                 return 0;
1424         }
1425
1426         tmp = os_malloc(len);
1427         if (tmp == NULL)
1428                 return -1;
1429         os_memcpy(tmp, buf, len);
1430
1431         hdr = (struct ieee802_1x_hdr *) tmp;
1432         key = (struct wpa_eapol_key *) (hdr + 1);
1433         plen = be_to_host16(hdr->length);
1434         data_len = plen + sizeof(*hdr);
1435         wpa_printf(MSG_DEBUG, "IEEE 802.1X RX: version=%d type=%d length=%lu",
1436                    hdr->version, hdr->type, (unsigned long) plen);
1437
1438         if (hdr->version < EAPOL_VERSION) {
1439                 /* TODO: backwards compatibility */
1440         }
1441         if (hdr->type != IEEE802_1X_TYPE_EAPOL_KEY) {
1442                 wpa_printf(MSG_DEBUG, "WPA: EAPOL frame (type %u) discarded, "
1443                         "not a Key frame", hdr->type);
1444                 ret = 0;
1445                 goto out;
1446         }
1447         if (plen > len - sizeof(*hdr) || plen < sizeof(*key)) {
1448                 wpa_printf(MSG_DEBUG, "WPA: EAPOL frame payload size %lu "
1449                            "invalid (frame size %lu)",
1450                            (unsigned long) plen, (unsigned long) len);
1451                 ret = 0;
1452                 goto out;
1453         }
1454
1455         if (key->type != EAPOL_KEY_TYPE_WPA && key->type != EAPOL_KEY_TYPE_RSN)
1456         {
1457                 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key type (%d) unknown, "
1458                            "discarded", key->type);
1459                 ret = 0;
1460                 goto out;
1461         }
1462         wpa_eapol_key_dump(key);
1463
1464         eapol_sm_notify_lower_layer_success(sm->eapol, 0);
1465         wpa_hexdump(MSG_MSGDUMP, "WPA: RX EAPOL-Key", tmp, len);
1466         if (data_len < len) {
1467                 wpa_printf(MSG_DEBUG, "WPA: ignoring %lu bytes after the IEEE "
1468                            "802.1X data", (unsigned long) len - data_len);
1469         }
1470         key_info = WPA_GET_BE16(key->key_info);
1471         ver = key_info & WPA_KEY_INFO_TYPE_MASK;
1472         if (ver != WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 &&
1473 #ifdef CONFIG_IEEE80211R
1474             ver != WPA_KEY_INFO_TYPE_AES_128_CMAC &&
1475 #endif /* CONFIG_IEEE80211R */
1476             ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1477                 wpa_printf(MSG_INFO, "WPA: Unsupported EAPOL-Key descriptor "
1478                            "version %d.", ver);
1479                 goto out;
1480         }
1481
1482 #ifdef CONFIG_IEEE80211R
1483         if (wpa_key_mgmt_ft(sm->key_mgmt)) {
1484                 /* IEEE 802.11r uses a new key_info type (AES-128-CMAC). */
1485                 if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1486                         wpa_printf(MSG_INFO, "FT: AP did not use "
1487                                    "AES-128-CMAC.");
1488                         goto out;
1489                 }
1490         } else
1491 #endif /* CONFIG_IEEE80211R */
1492 #ifdef CONFIG_IEEE80211W
1493         if (wpa_key_mgmt_sha256(sm->key_mgmt)) {
1494                 if (ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1495                         wpa_printf(MSG_INFO, "WPA: AP did not use the "
1496                                    "negotiated AES-128-CMAC.");
1497                         goto out;
1498                 }
1499         } else
1500 #endif /* CONFIG_IEEE80211W */
1501         if (sm->pairwise_cipher == WPA_CIPHER_CCMP &&
1502             ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1503                 wpa_printf(MSG_INFO, "WPA: CCMP is used, but EAPOL-Key "
1504                            "descriptor version (%d) is not 2.", ver);
1505                 if (sm->group_cipher != WPA_CIPHER_CCMP &&
1506                     !(key_info & WPA_KEY_INFO_KEY_TYPE)) {
1507                         /* Earlier versions of IEEE 802.11i did not explicitly
1508                          * require version 2 descriptor for all EAPOL-Key
1509                          * packets, so allow group keys to use version 1 if
1510                          * CCMP is not used for them. */
1511                         wpa_printf(MSG_INFO, "WPA: Backwards compatibility: "
1512                                    "allow invalid version for non-CCMP group "
1513                                    "keys");
1514                 } else
1515                         goto out;
1516         }
1517
1518 #ifdef CONFIG_PEERKEY
1519         for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) {
1520                 if (os_memcmp(peerkey->addr, src_addr, ETH_ALEN) == 0)
1521                         break;
1522         }
1523
1524         if (!(key_info & WPA_KEY_INFO_SMK_MESSAGE) && peerkey) {
1525                 if (!peerkey->initiator && peerkey->replay_counter_set &&
1526                     os_memcmp(key->replay_counter, peerkey->replay_counter,
1527                               WPA_REPLAY_COUNTER_LEN) <= 0) {
1528                         wpa_printf(MSG_WARNING, "RSN: EAPOL-Key Replay "
1529                                    "Counter did not increase (STK) - dropping "
1530                                    "packet");
1531                         goto out;
1532                 } else if (peerkey->initiator) {
1533                         u8 _tmp[WPA_REPLAY_COUNTER_LEN];
1534                         os_memcpy(_tmp, key->replay_counter,
1535                                   WPA_REPLAY_COUNTER_LEN);
1536                         inc_byte_array(_tmp, WPA_REPLAY_COUNTER_LEN);
1537                         if (os_memcmp(_tmp, peerkey->replay_counter,
1538                                       WPA_REPLAY_COUNTER_LEN) != 0) {
1539                                 wpa_printf(MSG_DEBUG, "RSN: EAPOL-Key Replay "
1540                                            "Counter did not match (STK) - "
1541                                            "dropping packet");
1542                                 goto out;
1543                         }
1544                 }
1545         }
1546
1547         if (peerkey && peerkey->initiator && (key_info & WPA_KEY_INFO_ACK)) {
1548                 wpa_printf(MSG_INFO, "RSN: Ack bit in key_info from STK peer");
1549                 goto out;
1550         }
1551 #endif /* CONFIG_PEERKEY */
1552
1553         if (!peerkey && sm->rx_replay_counter_set &&
1554             os_memcmp(key->replay_counter, sm->rx_replay_counter,
1555                       WPA_REPLAY_COUNTER_LEN) <= 0) {
1556                 wpa_printf(MSG_WARNING, "WPA: EAPOL-Key Replay Counter did not"
1557                            " increase - dropping packet");
1558                 goto out;
1559         }
1560
1561         if (!(key_info & (WPA_KEY_INFO_ACK | WPA_KEY_INFO_SMK_MESSAGE))
1562 #ifdef CONFIG_PEERKEY
1563             && (peerkey == NULL || !peerkey->initiator)
1564 #endif /* CONFIG_PEERKEY */
1565                 ) {
1566                 wpa_printf(MSG_INFO, "WPA: No Ack bit in key_info");
1567                 goto out;
1568         }
1569
1570         if (key_info & WPA_KEY_INFO_REQUEST) {
1571                 wpa_printf(MSG_INFO, "WPA: EAPOL-Key with Request bit - "
1572                            "dropped");
1573                 goto out;
1574         }
1575
1576         if ((key_info & WPA_KEY_INFO_MIC) && !peerkey &&
1577             wpa_supplicant_verify_eapol_key_mic(sm, key, ver, tmp, data_len))
1578                 goto out;
1579
1580 #ifdef CONFIG_PEERKEY
1581         if ((key_info & WPA_KEY_INFO_MIC) && peerkey &&
1582             peerkey_verify_eapol_key_mic(sm, peerkey, key, ver, tmp, data_len))
1583                 goto out;
1584 #endif /* CONFIG_PEERKEY */
1585
1586         extra_len = data_len - sizeof(*hdr) - sizeof(*key);
1587
1588         if (WPA_GET_BE16(key->key_data_length) > extra_len) {
1589                 wpa_msg(sm->ctx->ctx, MSG_INFO, "WPA: Invalid EAPOL-Key "
1590                         "frame - key_data overflow (%d > %lu)",
1591                         WPA_GET_BE16(key->key_data_length),
1592                         (unsigned long) extra_len);
1593                 goto out;
1594         }
1595         extra_len = WPA_GET_BE16(key->key_data_length);
1596
1597         if (sm->proto == WPA_PROTO_RSN &&
1598             (key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1599                 if (wpa_supplicant_decrypt_key_data(sm, key, ver))
1600                         goto out;
1601                 extra_len = WPA_GET_BE16(key->key_data_length);
1602         }
1603
1604         if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1605                 if (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) {
1606                         wpa_printf(MSG_WARNING, "WPA: Ignored EAPOL-Key "
1607                                    "(Pairwise) with non-zero key index");
1608                         goto out;
1609                 }
1610                 if (peerkey) {
1611                         /* PeerKey 4-Way Handshake */
1612                         peerkey_rx_eapol_4way(sm, peerkey, key, key_info, ver);
1613                 } else if (key_info & WPA_KEY_INFO_MIC) {
1614                         /* 3/4 4-Way Handshake */
1615                         wpa_supplicant_process_3_of_4(sm, key, ver);
1616                 } else {
1617                         /* 1/4 4-Way Handshake */
1618                         wpa_supplicant_process_1_of_4(sm, src_addr, key,
1619                                                       ver);
1620                 }
1621         } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
1622                 /* PeerKey SMK Handshake */
1623                 peerkey_rx_eapol_smk(sm, src_addr, key, extra_len, key_info,
1624                                      ver);
1625         } else {
1626                 if (key_info & WPA_KEY_INFO_MIC) {
1627                         /* 1/2 Group Key Handshake */
1628                         wpa_supplicant_process_1_of_2(sm, src_addr, key,
1629                                                       extra_len, ver);
1630                 } else {
1631                         wpa_printf(MSG_WARNING, "WPA: EAPOL-Key (Group) "
1632                                    "without Mic bit - dropped");
1633                 }
1634         }
1635
1636         ret = 1;
1637
1638 out:
1639         os_free(tmp);
1640         return ret;
1641 }
1642
1643
1644 #ifdef CONFIG_CTRL_IFACE
1645 static int wpa_cipher_bits(int cipher)
1646 {
1647         switch (cipher) {
1648         case WPA_CIPHER_CCMP:
1649                 return 128;
1650         case WPA_CIPHER_TKIP:
1651                 return 256;
1652         case WPA_CIPHER_WEP104:
1653                 return 104;
1654         case WPA_CIPHER_WEP40:
1655                 return 40;
1656         default:
1657                 return 0;
1658         }
1659 }
1660
1661
1662 static u32 wpa_key_mgmt_suite(struct wpa_sm *sm)
1663 {
1664         switch (sm->key_mgmt) {
1665         case WPA_KEY_MGMT_IEEE8021X:
1666                 return (sm->proto == WPA_PROTO_RSN ?
1667                         RSN_AUTH_KEY_MGMT_UNSPEC_802_1X :
1668                         WPA_AUTH_KEY_MGMT_UNSPEC_802_1X);
1669         case WPA_KEY_MGMT_PSK:
1670                 return (sm->proto == WPA_PROTO_RSN ?
1671                         RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X :
1672                         WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X);
1673 #ifdef CONFIG_IEEE80211R
1674         case WPA_KEY_MGMT_FT_IEEE8021X:
1675                 return RSN_AUTH_KEY_MGMT_FT_802_1X;
1676         case WPA_KEY_MGMT_FT_PSK:
1677                 return RSN_AUTH_KEY_MGMT_FT_PSK;
1678 #endif /* CONFIG_IEEE80211R */
1679 #ifdef CONFIG_IEEE80211W
1680         case WPA_KEY_MGMT_IEEE8021X_SHA256:
1681                 return RSN_AUTH_KEY_MGMT_802_1X_SHA256;
1682         case WPA_KEY_MGMT_PSK_SHA256:
1683                 return RSN_AUTH_KEY_MGMT_PSK_SHA256;
1684 #endif /* CONFIG_IEEE80211W */
1685         case WPA_KEY_MGMT_WPA_NONE:
1686                 return WPA_AUTH_KEY_MGMT_NONE;
1687         default:
1688                 return 0;
1689         }
1690 }
1691
1692
1693 static u32 wpa_cipher_suite(struct wpa_sm *sm, int cipher)
1694 {
1695         switch (cipher) {
1696         case WPA_CIPHER_CCMP:
1697                 return (sm->proto == WPA_PROTO_RSN ?
1698                         RSN_CIPHER_SUITE_CCMP : WPA_CIPHER_SUITE_CCMP);
1699         case WPA_CIPHER_TKIP:
1700                 return (sm->proto == WPA_PROTO_RSN ?
1701                         RSN_CIPHER_SUITE_TKIP : WPA_CIPHER_SUITE_TKIP);
1702         case WPA_CIPHER_WEP104:
1703                 return (sm->proto == WPA_PROTO_RSN ?
1704                         RSN_CIPHER_SUITE_WEP104 : WPA_CIPHER_SUITE_WEP104);
1705         case WPA_CIPHER_WEP40:
1706                 return (sm->proto == WPA_PROTO_RSN ?
1707                         RSN_CIPHER_SUITE_WEP40 : WPA_CIPHER_SUITE_WEP40);
1708         case WPA_CIPHER_NONE:
1709                 return (sm->proto == WPA_PROTO_RSN ?
1710                         RSN_CIPHER_SUITE_NONE : WPA_CIPHER_SUITE_NONE);
1711         default:
1712                 return 0;
1713         }
1714 }
1715
1716
1717 #define RSN_SUITE "%02x-%02x-%02x-%d"
1718 #define RSN_SUITE_ARG(s) \
1719 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
1720
1721 /**
1722  * wpa_sm_get_mib - Dump text list of MIB entries
1723  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1724  * @buf: Buffer for the list
1725  * @buflen: Length of the buffer
1726  * Returns: Number of bytes written to buffer
1727  *
1728  * This function is used fetch dot11 MIB variables.
1729  */
1730 int wpa_sm_get_mib(struct wpa_sm *sm, char *buf, size_t buflen)
1731 {
1732         char pmkid_txt[PMKID_LEN * 2 + 1];
1733         int rsna, ret;
1734         size_t len;
1735
1736         if (sm->cur_pmksa) {
1737                 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
1738                                  sm->cur_pmksa->pmkid, PMKID_LEN);
1739         } else
1740                 pmkid_txt[0] = '\0';
1741
1742         if ((wpa_key_mgmt_wpa_psk(sm->key_mgmt) ||
1743              wpa_key_mgmt_wpa_ieee8021x(sm->key_mgmt)) &&
1744             sm->proto == WPA_PROTO_RSN)
1745                 rsna = 1;
1746         else
1747                 rsna = 0;
1748
1749         ret = os_snprintf(buf, buflen,
1750                           "dot11RSNAOptionImplemented=TRUE\n"
1751                           "dot11RSNAPreauthenticationImplemented=TRUE\n"
1752                           "dot11RSNAEnabled=%s\n"
1753                           "dot11RSNAPreauthenticationEnabled=%s\n"
1754                           "dot11RSNAConfigVersion=%d\n"
1755                           "dot11RSNAConfigPairwiseKeysSupported=5\n"
1756                           "dot11RSNAConfigGroupCipherSize=%d\n"
1757                           "dot11RSNAConfigPMKLifetime=%d\n"
1758                           "dot11RSNAConfigPMKReauthThreshold=%d\n"
1759                           "dot11RSNAConfigNumberOfPTKSAReplayCounters=1\n"
1760                           "dot11RSNAConfigSATimeout=%d\n",
1761                           rsna ? "TRUE" : "FALSE",
1762                           rsna ? "TRUE" : "FALSE",
1763                           RSN_VERSION,
1764                           wpa_cipher_bits(sm->group_cipher),
1765                           sm->dot11RSNAConfigPMKLifetime,
1766                           sm->dot11RSNAConfigPMKReauthThreshold,
1767                           sm->dot11RSNAConfigSATimeout);
1768         if (ret < 0 || (size_t) ret >= buflen)
1769                 return 0;
1770         len = ret;
1771
1772         ret = os_snprintf(
1773                 buf + len, buflen - len,
1774                 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
1775                 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
1776                 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
1777                 "dot11RSNAPMKIDUsed=%s\n"
1778                 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
1779                 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
1780                 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
1781                 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n"
1782                 "dot11RSNA4WayHandshakeFailures=%u\n",
1783                 RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)),
1784                 RSN_SUITE_ARG(wpa_cipher_suite(sm, sm->pairwise_cipher)),
1785                 RSN_SUITE_ARG(wpa_cipher_suite(sm, sm->group_cipher)),
1786                 pmkid_txt,
1787                 RSN_SUITE_ARG(wpa_key_mgmt_suite(sm)),
1788                 RSN_SUITE_ARG(wpa_cipher_suite(sm, sm->pairwise_cipher)),
1789                 RSN_SUITE_ARG(wpa_cipher_suite(sm, sm->group_cipher)),
1790                 sm->dot11RSNA4WayHandshakeFailures);
1791         if (ret >= 0 && (size_t) ret < buflen)
1792                 len += ret;
1793
1794         return (int) len;
1795 }
1796 #endif /* CONFIG_CTRL_IFACE */
1797
1798
1799 static void wpa_sm_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
1800                                  void *ctx, int replace)
1801 {
1802         struct wpa_sm *sm = ctx;
1803
1804         if (sm->cur_pmksa == entry ||
1805             (sm->pmk_len == entry->pmk_len &&
1806              os_memcmp(sm->pmk, entry->pmk, sm->pmk_len) == 0)) {
1807                 wpa_printf(MSG_DEBUG, "RSN: removed current PMKSA entry");
1808                 sm->cur_pmksa = NULL;
1809
1810                 if (replace) {
1811                         /* A new entry is being added, so no need to
1812                          * deauthenticate in this case. This happens when EAP
1813                          * authentication is completed again (reauth or failed
1814                          * PMKSA caching attempt). */
1815                         return;
1816                 }
1817
1818                 os_memset(sm->pmk, 0, sizeof(sm->pmk));
1819                 wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
1820         }
1821 }
1822
1823
1824 /**
1825  * wpa_sm_init - Initialize WPA state machine
1826  * @ctx: Context pointer for callbacks; this needs to be an allocated buffer
1827  * Returns: Pointer to the allocated WPA state machine data
1828  *
1829  * This function is used to allocate a new WPA state machine and the returned
1830  * value is passed to all WPA state machine calls.
1831  */
1832 struct wpa_sm * wpa_sm_init(struct wpa_sm_ctx *ctx)
1833 {
1834         struct wpa_sm *sm;
1835
1836         sm = os_zalloc(sizeof(*sm));
1837         if (sm == NULL)
1838                 return NULL;
1839         sm->renew_snonce = 1;
1840         sm->ctx = ctx;
1841
1842         sm->dot11RSNAConfigPMKLifetime = 43200;
1843         sm->dot11RSNAConfigPMKReauthThreshold = 70;
1844         sm->dot11RSNAConfigSATimeout = 60;
1845
1846         sm->pmksa = pmksa_cache_init(wpa_sm_pmksa_free_cb, sm, sm);
1847         if (sm->pmksa == NULL) {
1848                 wpa_printf(MSG_ERROR, "RSN: PMKSA cache initialization "
1849                            "failed");
1850                 os_free(sm);
1851                 return NULL;
1852         }
1853
1854         return sm;
1855 }
1856
1857
1858 /**
1859  * wpa_sm_deinit - Deinitialize WPA state machine
1860  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1861  */
1862 void wpa_sm_deinit(struct wpa_sm *sm)
1863 {
1864         if (sm == NULL)
1865                 return;
1866         pmksa_cache_deinit(sm->pmksa);
1867         eloop_cancel_timeout(wpa_sm_start_preauth, sm, NULL);
1868         eloop_cancel_timeout(wpa_sm_rekey_ptk, sm, NULL);
1869         os_free(sm->assoc_wpa_ie);
1870         os_free(sm->ap_wpa_ie);
1871         os_free(sm->ap_rsn_ie);
1872         os_free(sm->ctx);
1873         peerkey_deinit(sm);
1874         os_free(sm);
1875 }
1876
1877
1878 /**
1879  * wpa_sm_notify_assoc - Notify WPA state machine about association
1880  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1881  * @bssid: The BSSID of the new association
1882  *
1883  * This function is called to let WPA state machine know that the connection
1884  * was established.
1885  */
1886 void wpa_sm_notify_assoc(struct wpa_sm *sm, const u8 *bssid)
1887 {
1888         int clear_ptk = 1;
1889
1890         if (sm == NULL)
1891                 return;
1892
1893         wpa_printf(MSG_DEBUG, "WPA: Association event - clear replay counter");
1894         os_memcpy(sm->bssid, bssid, ETH_ALEN);
1895         os_memset(sm->rx_replay_counter, 0, WPA_REPLAY_COUNTER_LEN);
1896         sm->rx_replay_counter_set = 0;
1897         sm->renew_snonce = 1;
1898         if (os_memcmp(sm->preauth_bssid, bssid, ETH_ALEN) == 0)
1899                 rsn_preauth_deinit(sm);
1900
1901 #ifdef CONFIG_IEEE80211R
1902         if (wpa_ft_is_completed(sm)) {
1903                 wpa_supplicant_key_neg_complete(sm, sm->bssid, 1);
1904
1905                 /* Prepare for the next transition */
1906                 wpa_ft_prepare_auth_request(sm);
1907
1908                 clear_ptk = 0;
1909         }
1910 #endif /* CONFIG_IEEE80211R */
1911
1912         if (clear_ptk) {
1913                 /*
1914                  * IEEE 802.11, 8.4.10: Delete PTK SA on (re)association if
1915                  * this is not part of a Fast BSS Transition.
1916                  */
1917                 wpa_printf(MSG_DEBUG, "WPA: Clear old PTK");
1918                 sm->ptk_set = 0;
1919                 sm->tptk_set = 0;
1920         }
1921 }
1922
1923
1924 /**
1925  * wpa_sm_notify_disassoc - Notify WPA state machine about disassociation
1926  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1927  *
1928  * This function is called to let WPA state machine know that the connection
1929  * was lost. This will abort any existing pre-authentication session.
1930  */
1931 void wpa_sm_notify_disassoc(struct wpa_sm *sm)
1932 {
1933         rsn_preauth_deinit(sm);
1934         if (wpa_sm_get_state(sm) == WPA_4WAY_HANDSHAKE)
1935                 sm->dot11RSNA4WayHandshakeFailures++;
1936 }
1937
1938
1939 /**
1940  * wpa_sm_set_pmk - Set PMK
1941  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1942  * @pmk: The new PMK
1943  * @pmk_len: The length of the new PMK in bytes
1944  *
1945  * Configure the PMK for WPA state machine.
1946  */
1947 void wpa_sm_set_pmk(struct wpa_sm *sm, const u8 *pmk, size_t pmk_len)
1948 {
1949         if (sm == NULL)
1950                 return;
1951
1952         sm->pmk_len = pmk_len;
1953         os_memcpy(sm->pmk, pmk, pmk_len);
1954
1955 #ifdef CONFIG_IEEE80211R
1956         /* Set XXKey to be PSK for FT key derivation */
1957         sm->xxkey_len = pmk_len;
1958         os_memcpy(sm->xxkey, pmk, pmk_len);
1959 #endif /* CONFIG_IEEE80211R */
1960 }
1961
1962
1963 /**
1964  * wpa_sm_set_pmk_from_pmksa - Set PMK based on the current PMKSA
1965  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1966  *
1967  * Take the PMK from the current PMKSA into use. If no PMKSA is active, the PMK
1968  * will be cleared.
1969  */
1970 void wpa_sm_set_pmk_from_pmksa(struct wpa_sm *sm)
1971 {
1972         if (sm == NULL)
1973                 return;
1974
1975         if (sm->cur_pmksa) {
1976                 sm->pmk_len = sm->cur_pmksa->pmk_len;
1977                 os_memcpy(sm->pmk, sm->cur_pmksa->pmk, sm->pmk_len);
1978         } else {
1979                 sm->pmk_len = PMK_LEN;
1980                 os_memset(sm->pmk, 0, PMK_LEN);
1981         }
1982 }
1983
1984
1985 /**
1986  * wpa_sm_set_fast_reauth - Set fast reauthentication (EAP) enabled/disabled
1987  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1988  * @fast_reauth: Whether fast reauthentication (EAP) is allowed
1989  */
1990 void wpa_sm_set_fast_reauth(struct wpa_sm *sm, int fast_reauth)
1991 {
1992         if (sm)
1993                 sm->fast_reauth = fast_reauth;
1994 }
1995
1996
1997 /**
1998  * wpa_sm_set_scard_ctx - Set context pointer for smartcard callbacks
1999  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2000  * @scard_ctx: Context pointer for smartcard related callback functions
2001  */
2002 void wpa_sm_set_scard_ctx(struct wpa_sm *sm, void *scard_ctx)
2003 {
2004         if (sm == NULL)
2005                 return;
2006         sm->scard_ctx = scard_ctx;
2007         if (sm->preauth_eapol)
2008                 eapol_sm_register_scard_ctx(sm->preauth_eapol, scard_ctx);
2009 }
2010
2011
2012 /**
2013  * wpa_sm_set_config - Notification of current configration change
2014  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2015  * @config: Pointer to current network configuration
2016  *
2017  * Notify WPA state machine that configuration has changed. config will be
2018  * stored as a backpointer to network configuration. This can be %NULL to clear
2019  * the stored pointed.
2020  */
2021 void wpa_sm_set_config(struct wpa_sm *sm, struct rsn_supp_config *config)
2022 {
2023         if (!sm)
2024                 return;
2025
2026         if (config) {
2027                 sm->network_ctx = config->network_ctx;
2028                 sm->peerkey_enabled = config->peerkey_enabled;
2029                 sm->allowed_pairwise_cipher = config->allowed_pairwise_cipher;
2030                 sm->proactive_key_caching = config->proactive_key_caching;
2031                 sm->eap_workaround = config->eap_workaround;
2032                 sm->eap_conf_ctx = config->eap_conf_ctx;
2033                 if (config->ssid) {
2034                         os_memcpy(sm->ssid, config->ssid, config->ssid_len);
2035                         sm->ssid_len = config->ssid_len;
2036                 } else
2037                         sm->ssid_len = 0;
2038                 sm->wpa_ptk_rekey = config->wpa_ptk_rekey;
2039         } else {
2040                 sm->network_ctx = NULL;
2041                 sm->peerkey_enabled = 0;
2042                 sm->allowed_pairwise_cipher = 0;
2043                 sm->proactive_key_caching = 0;
2044                 sm->eap_workaround = 0;
2045                 sm->eap_conf_ctx = NULL;
2046                 sm->ssid_len = 0;
2047                 sm->wpa_ptk_rekey = 0;
2048         }
2049         if (config == NULL || config->network_ctx != sm->network_ctx)
2050                 pmksa_cache_notify_reconfig(sm->pmksa);
2051 }
2052
2053
2054 /**
2055  * wpa_sm_set_own_addr - Set own MAC address
2056  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2057  * @addr: Own MAC address
2058  */
2059 void wpa_sm_set_own_addr(struct wpa_sm *sm, const u8 *addr)
2060 {
2061         if (sm)
2062                 os_memcpy(sm->own_addr, addr, ETH_ALEN);
2063 }
2064
2065
2066 /**
2067  * wpa_sm_set_ifname - Set network interface name
2068  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2069  * @ifname: Interface name
2070  * @bridge_ifname: Optional bridge interface name (for pre-auth)
2071  */
2072 void wpa_sm_set_ifname(struct wpa_sm *sm, const char *ifname,
2073                        const char *bridge_ifname)
2074 {
2075         if (sm) {
2076                 sm->ifname = ifname;
2077                 sm->bridge_ifname = bridge_ifname;
2078         }
2079 }
2080
2081
2082 /**
2083  * wpa_sm_set_eapol - Set EAPOL state machine pointer
2084  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2085  * @eapol: Pointer to EAPOL state machine allocated with eapol_sm_init()
2086  */
2087 void wpa_sm_set_eapol(struct wpa_sm *sm, struct eapol_sm *eapol)
2088 {
2089         if (sm)
2090                 sm->eapol = eapol;
2091 }
2092
2093
2094 /**
2095  * wpa_sm_set_param - Set WPA state machine parameters
2096  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2097  * @param: Parameter field
2098  * @value: Parameter value
2099  * Returns: 0 on success, -1 on failure
2100  */
2101 int wpa_sm_set_param(struct wpa_sm *sm, enum wpa_sm_conf_params param,
2102                      unsigned int value)
2103 {
2104         int ret = 0;
2105
2106         if (sm == NULL)
2107                 return -1;
2108
2109         switch (param) {
2110         case RSNA_PMK_LIFETIME:
2111                 if (value > 0)
2112                         sm->dot11RSNAConfigPMKLifetime = value;
2113                 else
2114                         ret = -1;
2115                 break;
2116         case RSNA_PMK_REAUTH_THRESHOLD:
2117                 if (value > 0 && value <= 100)
2118                         sm->dot11RSNAConfigPMKReauthThreshold = value;
2119                 else
2120                         ret = -1;
2121                 break;
2122         case RSNA_SA_TIMEOUT:
2123                 if (value > 0)
2124                         sm->dot11RSNAConfigSATimeout = value;
2125                 else
2126                         ret = -1;
2127                 break;
2128         case WPA_PARAM_PROTO:
2129                 sm->proto = value;
2130                 break;
2131         case WPA_PARAM_PAIRWISE:
2132                 sm->pairwise_cipher = value;
2133                 break;
2134         case WPA_PARAM_GROUP:
2135                 sm->group_cipher = value;
2136                 break;
2137         case WPA_PARAM_KEY_MGMT:
2138                 sm->key_mgmt = value;
2139                 break;
2140 #ifdef CONFIG_IEEE80211W
2141         case WPA_PARAM_MGMT_GROUP:
2142                 sm->mgmt_group_cipher = value;
2143                 break;
2144 #endif /* CONFIG_IEEE80211W */
2145         case WPA_PARAM_RSN_ENABLED:
2146                 sm->rsn_enabled = value;
2147                 break;
2148         default:
2149                 break;
2150         }
2151
2152         return ret;
2153 }
2154
2155
2156 /**
2157  * wpa_sm_get_param - Get WPA state machine parameters
2158  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2159  * @param: Parameter field
2160  * Returns: Parameter value
2161  */
2162 unsigned int wpa_sm_get_param(struct wpa_sm *sm, enum wpa_sm_conf_params param)
2163 {
2164         if (sm == NULL)
2165                 return 0;
2166
2167         switch (param) {
2168         case RSNA_PMK_LIFETIME:
2169                 return sm->dot11RSNAConfigPMKLifetime;
2170         case RSNA_PMK_REAUTH_THRESHOLD:
2171                 return sm->dot11RSNAConfigPMKReauthThreshold;
2172         case RSNA_SA_TIMEOUT:
2173                 return sm->dot11RSNAConfigSATimeout;
2174         case WPA_PARAM_PROTO:
2175                 return sm->proto;
2176         case WPA_PARAM_PAIRWISE:
2177                 return sm->pairwise_cipher;
2178         case WPA_PARAM_GROUP:
2179                 return sm->group_cipher;
2180         case WPA_PARAM_KEY_MGMT:
2181                 return sm->key_mgmt;
2182 #ifdef CONFIG_IEEE80211W
2183         case WPA_PARAM_MGMT_GROUP:
2184                 return sm->mgmt_group_cipher;
2185 #endif /* CONFIG_IEEE80211W */
2186         case WPA_PARAM_RSN_ENABLED:
2187                 return sm->rsn_enabled;
2188         default:
2189                 return 0;
2190         }
2191 }
2192
2193
2194 /**
2195  * wpa_sm_get_status - Get WPA state machine
2196  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2197  * @buf: Buffer for status information
2198  * @buflen: Maximum buffer length
2199  * @verbose: Whether to include verbose status information
2200  * Returns: Number of bytes written to buf.
2201  *
2202  * Query WPA state machine for status information. This function fills in
2203  * a text area with current status information. If the buffer (buf) is not
2204  * large enough, status information will be truncated to fit the buffer.
2205  */
2206 int wpa_sm_get_status(struct wpa_sm *sm, char *buf, size_t buflen,
2207                       int verbose)
2208 {
2209         char *pos = buf, *end = buf + buflen;
2210         int ret;
2211
2212         ret = os_snprintf(pos, end - pos,
2213                           "pairwise_cipher=%s\n"
2214                           "group_cipher=%s\n"
2215                           "key_mgmt=%s\n",
2216                           wpa_cipher_txt(sm->pairwise_cipher),
2217                           wpa_cipher_txt(sm->group_cipher),
2218                           wpa_key_mgmt_txt(sm->key_mgmt, sm->proto));
2219         if (ret < 0 || ret >= end - pos)
2220                 return pos - buf;
2221         pos += ret;
2222         return pos - buf;
2223 }
2224
2225
2226 /**
2227  * wpa_sm_set_assoc_wpa_ie_default - Generate own WPA/RSN IE from configuration
2228  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2229  * @wpa_ie: Pointer to buffer for WPA/RSN IE
2230  * @wpa_ie_len: Pointer to the length of the wpa_ie buffer
2231  * Returns: 0 on success, -1 on failure
2232  */
2233 int wpa_sm_set_assoc_wpa_ie_default(struct wpa_sm *sm, u8 *wpa_ie,
2234                                     size_t *wpa_ie_len)
2235 {
2236         int res;
2237
2238         if (sm == NULL)
2239                 return -1;
2240
2241         res = wpa_gen_wpa_ie(sm, wpa_ie, *wpa_ie_len);
2242         if (res < 0)
2243                 return -1;
2244         *wpa_ie_len = res;
2245
2246         wpa_hexdump(MSG_DEBUG, "WPA: Set own WPA IE default",
2247                     wpa_ie, *wpa_ie_len);
2248
2249         if (sm->assoc_wpa_ie == NULL) {
2250                 /*
2251                  * Make a copy of the WPA/RSN IE so that 4-Way Handshake gets
2252                  * the correct version of the IE even if PMKSA caching is
2253                  * aborted (which would remove PMKID from IE generation).
2254                  */
2255                 sm->assoc_wpa_ie = os_malloc(*wpa_ie_len);
2256                 if (sm->assoc_wpa_ie == NULL)
2257                         return -1;
2258
2259                 os_memcpy(sm->assoc_wpa_ie, wpa_ie, *wpa_ie_len);
2260                 sm->assoc_wpa_ie_len = *wpa_ie_len;
2261         }
2262
2263         return 0;
2264 }
2265
2266
2267 /**
2268  * wpa_sm_set_assoc_wpa_ie - Set own WPA/RSN IE from (Re)AssocReq
2269  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2270  * @ie: Pointer to IE data (starting from id)
2271  * @len: IE length
2272  * Returns: 0 on success, -1 on failure
2273  *
2274  * Inform WPA state machine about the WPA/RSN IE used in (Re)Association
2275  * Request frame. The IE will be used to override the default value generated
2276  * with wpa_sm_set_assoc_wpa_ie_default().
2277  */
2278 int wpa_sm_set_assoc_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len)
2279 {
2280         if (sm == NULL)
2281                 return -1;
2282
2283         os_free(sm->assoc_wpa_ie);
2284         if (ie == NULL || len == 0) {
2285                 wpa_printf(MSG_DEBUG, "WPA: clearing own WPA/RSN IE");
2286                 sm->assoc_wpa_ie = NULL;
2287                 sm->assoc_wpa_ie_len = 0;
2288         } else {
2289                 wpa_hexdump(MSG_DEBUG, "WPA: set own WPA/RSN IE", ie, len);
2290                 sm->assoc_wpa_ie = os_malloc(len);
2291                 if (sm->assoc_wpa_ie == NULL)
2292                         return -1;
2293
2294                 os_memcpy(sm->assoc_wpa_ie, ie, len);
2295                 sm->assoc_wpa_ie_len = len;
2296         }
2297
2298         return 0;
2299 }
2300
2301
2302 /**
2303  * wpa_sm_set_ap_wpa_ie - Set AP WPA IE from Beacon/ProbeResp
2304  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2305  * @ie: Pointer to IE data (starting from id)
2306  * @len: IE length
2307  * Returns: 0 on success, -1 on failure
2308  *
2309  * Inform WPA state machine about the WPA IE used in Beacon / Probe Response
2310  * frame.
2311  */
2312 int wpa_sm_set_ap_wpa_ie(struct wpa_sm *sm, const u8 *ie, size_t len)
2313 {
2314         if (sm == NULL)
2315                 return -1;
2316
2317         os_free(sm->ap_wpa_ie);
2318         if (ie == NULL || len == 0) {
2319                 wpa_printf(MSG_DEBUG, "WPA: clearing AP WPA IE");
2320                 sm->ap_wpa_ie = NULL;
2321                 sm->ap_wpa_ie_len = 0;
2322         } else {
2323                 wpa_hexdump(MSG_DEBUG, "WPA: set AP WPA IE", ie, len);
2324                 sm->ap_wpa_ie = os_malloc(len);
2325                 if (sm->ap_wpa_ie == NULL)
2326                         return -1;
2327
2328                 os_memcpy(sm->ap_wpa_ie, ie, len);
2329                 sm->ap_wpa_ie_len = len;
2330         }
2331
2332         return 0;
2333 }
2334
2335
2336 /**
2337  * wpa_sm_set_ap_rsn_ie - Set AP RSN IE from Beacon/ProbeResp
2338  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2339  * @ie: Pointer to IE data (starting from id)
2340  * @len: IE length
2341  * Returns: 0 on success, -1 on failure
2342  *
2343  * Inform WPA state machine about the RSN IE used in Beacon / Probe Response
2344  * frame.
2345  */
2346 int wpa_sm_set_ap_rsn_ie(struct wpa_sm *sm, const u8 *ie, size_t len)
2347 {
2348         if (sm == NULL)
2349                 return -1;
2350
2351         os_free(sm->ap_rsn_ie);
2352         if (ie == NULL || len == 0) {
2353                 wpa_printf(MSG_DEBUG, "WPA: clearing AP RSN IE");
2354                 sm->ap_rsn_ie = NULL;
2355                 sm->ap_rsn_ie_len = 0;
2356         } else {
2357                 wpa_hexdump(MSG_DEBUG, "WPA: set AP RSN IE", ie, len);
2358                 sm->ap_rsn_ie = os_malloc(len);
2359                 if (sm->ap_rsn_ie == NULL)
2360                         return -1;
2361
2362                 os_memcpy(sm->ap_rsn_ie, ie, len);
2363                 sm->ap_rsn_ie_len = len;
2364         }
2365
2366         return 0;
2367 }
2368
2369
2370 /**
2371  * wpa_sm_parse_own_wpa_ie - Parse own WPA/RSN IE
2372  * @sm: Pointer to WPA state machine data from wpa_sm_init()
2373  * @data: Pointer to data area for parsing results
2374  * Returns: 0 on success, -1 if IE is not known, or -2 on parsing failure
2375  *
2376  * Parse the contents of the own WPA or RSN IE from (Re)AssocReq and write the
2377  * parsed data into data.
2378  */
2379 int wpa_sm_parse_own_wpa_ie(struct wpa_sm *sm, struct wpa_ie_data *data)
2380 {
2381         if (sm == NULL || sm->assoc_wpa_ie == NULL) {
2382                 wpa_printf(MSG_DEBUG, "WPA: No WPA/RSN IE available from "
2383                            "association info");
2384                 return -1;
2385         }
2386         if (wpa_parse_wpa_ie(sm->assoc_wpa_ie, sm->assoc_wpa_ie_len, data))
2387                 return -2;
2388         return 0;
2389 }