src/rsn_supp/peerkey.c

   1 /*
   2  * WPA Supplicant - PeerKey for Direct Link Setup (DLS)
   3  * Copyright (c) 2006-2008, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10
  11 #ifdef CONFIG_PEERKEY
  12
  13 #include "common.h"
  14 #include "eloop.h"
  15 #include "crypto/sha1.h"
  16 #include "crypto/sha256.h"
  17 #include "crypto/random.h"
  18 #include "common/ieee802_11_defs.h"
  19 #include "wpa.h"
  20 #include "wpa_i.h"
  21 #include "wpa_ie.h"
  22 #include "peerkey.h"
  23
  24
  25 static u8 * wpa_add_ie(u8 *pos, const u8 *ie, size_t ie_len)
  26 {
  27         os_memcpy(pos, ie, ie_len);
  28         return pos + ie_len;
  29 }
  30
  31
  32 static u8 * wpa_add_kde(u8 *pos, u32 kde, const u8 *data, size_t data_len)
  33 {
  34         *pos++ = WLAN_EID_VENDOR_SPECIFIC;
  35         *pos++ = RSN_SELECTOR_LEN + data_len;
  36         RSN_SELECTOR_PUT(pos, kde);
  37         pos += RSN_SELECTOR_LEN;
  38         os_memcpy(pos, data, data_len);
  39         pos += data_len;
  40         return pos;
  41 }
  42
  43
  44 static void wpa_supplicant_smk_timeout(void *eloop_ctx, void *timeout_ctx)
  45 {
  46 #if 0
  47         struct wpa_sm *sm = eloop_ctx;
  48         struct wpa_peerkey *peerkey = timeout_ctx;
  49 #endif
  50         /* TODO: time out SMK and any STK that was generated using this SMK */
  51 }
  52
  53
  54 static void wpa_supplicant_peerkey_free(struct wpa_sm *sm,
  55                                         struct wpa_peerkey *peerkey)
  56 {
  57         eloop_cancel_timeout(wpa_supplicant_smk_timeout, sm, peerkey);
  58         os_free(peerkey);
  59 }
  60
  61
  62 static int wpa_supplicant_send_smk_error(struct wpa_sm *sm, const u8 *dst,
  63                                          const u8 *peer,
  64                                          u16 mui, u16 error_type, int ver)
  65 {
  66         size_t rlen;
  67         struct wpa_eapol_key *err;
  68         struct rsn_error_kde error;
  69         u8 *rbuf, *pos;
  70         size_t kde_len;
  71         u16 key_info;
  72
  73         kde_len = 2 + RSN_SELECTOR_LEN + sizeof(error);
  74         if (peer)
  75                 kde_len += 2 + RSN_SELECTOR_LEN + ETH_ALEN;
  76
  77         rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY,
  78                                   NULL, sizeof(*err) + kde_len, &rlen,
  79                                   (void *) &err);
  80         if (rbuf == NULL)
  81                 return -1;
  82
  83         err->type = EAPOL_KEY_TYPE_RSN;
  84         key_info = ver | WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_MIC |
  85                 WPA_KEY_INFO_SECURE | WPA_KEY_INFO_ERROR |
  86                 WPA_KEY_INFO_REQUEST;
  87         WPA_PUT_BE16(err->key_info, key_info);
  88         WPA_PUT_BE16(err->key_length, 0);
  89         os_memcpy(err->replay_counter, sm->request_counter,
  90                   WPA_REPLAY_COUNTER_LEN);
  91         inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN);
  92
  93         WPA_PUT_BE16(err->key_data_length, (u16) kde_len);
  94         pos = (u8 *) (err + 1);
  95
  96         if (peer) {
  97                 /* Peer MAC Address KDE */
  98                 pos = wpa_add_kde(pos, RSN_KEY_DATA_MAC_ADDR, peer, ETH_ALEN);
  99         }
 100
 101         /* Error KDE */
 102         error.mui = host_to_be16(mui);
 103         error.error_type = host_to_be16(error_type);
 104         wpa_add_kde(pos, RSN_KEY_DATA_ERROR, (u8 *) &error, sizeof(error));
 105
 106         if (peer) {
 107                 wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key SMK Error (peer "
 108                            MACSTR " mui %d error_type %d)",
 109                            MAC2STR(peer), mui, error_type);
 110         } else {
 111                 wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key SMK Error "
 112                            "(mui %d error_type %d)", mui, error_type);
 113         }
 114
 115         wpa_eapol_key_send(sm, sm->ptk.kck, ver, dst, ETH_P_EAPOL,
 116                            rbuf, rlen, err->key_mic);
 117
 118         return 0;
 119 }
 120
 121
 122 static int wpa_supplicant_send_smk_m3(struct wpa_sm *sm,
 123                                       const unsigned char *src_addr,
 124                                       const struct wpa_eapol_key *key,
 125                                       int ver, struct wpa_peerkey *peerkey)
 126 {
 127         size_t rlen;
 128         struct wpa_eapol_key *reply;
 129         u8 *rbuf, *pos;
 130         size_t kde_len;
 131         u16 key_info;
 132
 133         /* KDEs: Peer RSN IE, Initiator MAC Address, Initiator Nonce */
 134         kde_len = peerkey->rsnie_p_len +
 135                 2 + RSN_SELECTOR_LEN + ETH_ALEN +
 136                 2 + RSN_SELECTOR_LEN + WPA_NONCE_LEN;
 137
 138         rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY,
 139                                   NULL, sizeof(*reply) + kde_len, &rlen,
 140                                   (void *) &reply);
 141         if (rbuf == NULL)
 142                 return -1;
 143
 144         reply->type = EAPOL_KEY_TYPE_RSN;
 145         key_info = ver | WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_MIC |
 146                 WPA_KEY_INFO_SECURE;
 147         WPA_PUT_BE16(reply->key_info, key_info);
 148         WPA_PUT_BE16(reply->key_length, 0);
 149         os_memcpy(reply->replay_counter, key->replay_counter,
 150                   WPA_REPLAY_COUNTER_LEN);
 151
 152         os_memcpy(reply->key_nonce, peerkey->pnonce, WPA_NONCE_LEN);
 153
 154         WPA_PUT_BE16(reply->key_data_length, (u16) kde_len);
 155         pos = (u8 *) (reply + 1);
 156
 157         /* Peer RSN IE */
 158         pos = wpa_add_ie(pos, peerkey->rsnie_p, peerkey->rsnie_p_len);
 159
 160         /* Initiator MAC Address KDE */
 161         pos = wpa_add_kde(pos, RSN_KEY_DATA_MAC_ADDR, peerkey->addr, ETH_ALEN);
 162
 163         /* Initiator Nonce */
 164         wpa_add_kde(pos, RSN_KEY_DATA_NONCE, peerkey->inonce, WPA_NONCE_LEN);
 165
 166         wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key SMK M3");
 167         wpa_eapol_key_send(sm, sm->ptk.kck, ver, src_addr, ETH_P_EAPOL,
 168                            rbuf, rlen, reply->key_mic);
 169
 170         return 0;
 171 }
 172
 173
 174 static int wpa_supplicant_process_smk_m2(
 175         struct wpa_sm *sm, const unsigned char *src_addr,
 176         const struct wpa_eapol_key *key, size_t extra_len, int ver)
 177 {
 178         struct wpa_peerkey *peerkey;
 179         struct wpa_eapol_ie_parse kde;
 180         struct wpa_ie_data ie;
 181         int cipher;
 182         struct rsn_ie_hdr *hdr;
 183         u8 *pos;
 184
 185         wpa_printf(MSG_DEBUG, "RSN: Received SMK M2");
 186
 187         if (!sm->peerkey_enabled || sm->proto != WPA_PROTO_RSN) {
 188                 wpa_printf(MSG_INFO, "RSN: SMK handshake not allowed for "
 189                            "the current network");
 190                 return -1;
 191         }
 192
 193         if (wpa_supplicant_parse_ies((const u8 *) (key + 1), extra_len, &kde) <
 194             0) {
 195                 wpa_printf(MSG_INFO, "RSN: Failed to parse KDEs in SMK M2");
 196                 return -1;
 197         }
 198
 199         if (kde.rsn_ie == NULL || kde.mac_addr == NULL ||
 200             kde.mac_addr_len < ETH_ALEN) {
 201                 wpa_printf(MSG_INFO, "RSN: No RSN IE or MAC address KDE in "
 202                            "SMK M2");
 203                 return -1;
 204         }
 205
 206         wpa_printf(MSG_DEBUG, "RSN: SMK M2 - SMK initiator " MACSTR,
 207                    MAC2STR(kde.mac_addr));
 208
 209         if (kde.rsn_ie_len > PEERKEY_MAX_IE_LEN) {
 210                 wpa_printf(MSG_INFO, "RSN: Too long Initiator RSN IE in SMK "
 211                            "M2");
 212                 return -1;
 213         }
 214
 215         if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) {
 216                 wpa_printf(MSG_INFO, "RSN: Failed to parse RSN IE in SMK M2");
 217                 return -1;
 218         }
 219
 220         cipher = ie.pairwise_cipher & sm->allowed_pairwise_cipher;
 221         if (cipher & WPA_CIPHER_CCMP) {
 222                 wpa_printf(MSG_DEBUG, "RSN: Using CCMP for PeerKey");
 223                 cipher = WPA_CIPHER_CCMP;
 224         } else if (cipher & WPA_CIPHER_GCMP) {
 225                 wpa_printf(MSG_DEBUG, "RSN: Using GCMP for PeerKey");
 226                 cipher = WPA_CIPHER_GCMP;
 227         } else if (cipher & WPA_CIPHER_TKIP) {
 228                 wpa_printf(MSG_DEBUG, "RSN: Using TKIP for PeerKey");
 229                 cipher = WPA_CIPHER_TKIP;
 230         } else {
 231                 wpa_printf(MSG_INFO, "RSN: No acceptable cipher in SMK M2");
 232                 wpa_supplicant_send_smk_error(sm, src_addr, kde.mac_addr,
 233                                               STK_MUI_SMK, STK_ERR_CPHR_NS,
 234                                               ver);
 235                 return -1;
 236         }
 237
 238         /* TODO: find existing entry and if found, use that instead of adding
 239          * a new one; how to handle the case where both ends initiate at the
 240          * same time? */
 241         peerkey = os_zalloc(sizeof(*peerkey));
 242         if (peerkey == NULL)
 243                 return -1;
 244         os_memcpy(peerkey->addr, kde.mac_addr, ETH_ALEN);
 245         os_memcpy(peerkey->inonce, key->key_nonce, WPA_NONCE_LEN);
 246         os_memcpy(peerkey->rsnie_i, kde.rsn_ie, kde.rsn_ie_len);
 247         peerkey->rsnie_i_len = kde.rsn_ie_len;
 248         peerkey->cipher = cipher;
 249 #ifdef CONFIG_IEEE80211W
 250         if (ie.key_mgmt & (WPA_KEY_MGMT_IEEE8021X_SHA256 |
 251                            WPA_KEY_MGMT_PSK_SHA256))
 252                 peerkey->use_sha256 = 1;
 253 #endif /* CONFIG_IEEE80211W */
 254
 255         if (random_get_bytes(peerkey->pnonce, WPA_NONCE_LEN)) {
 256                 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
 257                         "WPA: Failed to get random data for PNonce");
 258                 wpa_supplicant_peerkey_free(sm, peerkey);
 259                 return -1;
 260         }
 261
 262         hdr = (struct rsn_ie_hdr *) peerkey->rsnie_p;
 263         hdr->elem_id = WLAN_EID_RSN;
 264         WPA_PUT_LE16(hdr->version, RSN_VERSION);
 265         pos = (u8 *) (hdr + 1);
 266         /* Group Suite can be anything for SMK RSN IE; receiver will just
 267          * ignore it. */
 268         RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
 269         pos += RSN_SELECTOR_LEN;
 270         /* Include only the selected cipher in pairwise cipher suite */
 271         WPA_PUT_LE16(pos, 1);
 272         pos += 2;
 273         if (cipher == WPA_CIPHER_CCMP)
 274                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
 275         else if (cipher == WPA_CIPHER_GCMP)
 276                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_GCMP);
 277         else if (cipher == WPA_CIPHER_TKIP)
 278                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
 279         pos += RSN_SELECTOR_LEN;
 280
 281         hdr->len = (pos - peerkey->rsnie_p) - 2;
 282         peerkey->rsnie_p_len = pos - peerkey->rsnie_p;
 283         wpa_hexdump(MSG_DEBUG, "WPA: RSN IE for SMK handshake",
 284                     peerkey->rsnie_p, peerkey->rsnie_p_len);
 285
 286         wpa_supplicant_send_smk_m3(sm, src_addr, key, ver, peerkey);
 287
 288         peerkey->next = sm->peerkey;
 289         sm->peerkey = peerkey;
 290
 291         return 0;
 292 }
 293
 294
 295 /**
 296  * rsn_smkid - Derive SMK identifier
 297  * @smk: Station master key (32 bytes)
 298  * @pnonce: Peer Nonce
 299  * @mac_p: Peer MAC address
 300  * @inonce: Initiator Nonce
 301  * @mac_i: Initiator MAC address
 302  * @use_sha256: Whether to use SHA256-based KDF
 303  *
 304  * 8.5.1.4 Station to station (STK) key hierarchy
 305  * SMKID = HMAC-SHA1-128(SMK, "SMK Name" || PNonce || MAC_P || INonce || MAC_I)
 306  */
 307 static void rsn_smkid(const u8 *smk, const u8 *pnonce, const u8 *mac_p,
 308                       const u8 *inonce, const u8 *mac_i, u8 *smkid,
 309                       int use_sha256)
 310 {
 311         char *title = "SMK Name";
 312         const u8 *addr[5];
 313         const size_t len[5] = { 8, WPA_NONCE_LEN, ETH_ALEN, WPA_NONCE_LEN,
 314                                 ETH_ALEN };
 315         unsigned char hash[SHA256_MAC_LEN];
 316
 317         addr[0] = (u8 *) title;
 318         addr[1] = pnonce;
 319         addr[2] = mac_p;
 320         addr[3] = inonce;
 321         addr[4] = mac_i;
 322
 323 #ifdef CONFIG_IEEE80211W
 324         if (use_sha256)
 325                 hmac_sha256_vector(smk, PMK_LEN, 5, addr, len, hash);
 326         else
 327 #endif /* CONFIG_IEEE80211W */
 328                 hmac_sha1_vector(smk, PMK_LEN, 5, addr, len, hash);
 329         os_memcpy(smkid, hash, PMKID_LEN);
 330 }
 331
 332
 333 static void wpa_supplicant_send_stk_1_of_4(struct wpa_sm *sm,
 334                                            struct wpa_peerkey *peerkey)
 335 {
 336         size_t mlen;
 337         struct wpa_eapol_key *msg;
 338         u8 *mbuf;
 339         size_t kde_len;
 340         u16 key_info, ver;
 341
 342         kde_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
 343
 344         mbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
 345                                   sizeof(*msg) + kde_len, &mlen,
 346                                   (void *) &msg);
 347         if (mbuf == NULL)
 348                 return;
 349
 350         msg->type = EAPOL_KEY_TYPE_RSN;
 351
 352         if (peerkey->cipher != WPA_CIPHER_TKIP)
 353                 ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
 354         else
 355                 ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
 356
 357         key_info = ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_ACK;
 358         WPA_PUT_BE16(msg->key_info, key_info);
 359
 360         if (peerkey->cipher != WPA_CIPHER_TKIP)
 361                 WPA_PUT_BE16(msg->key_length, 16);
 362         else
 363                 WPA_PUT_BE16(msg->key_length, 32);
 364
 365         os_memcpy(msg->replay_counter, peerkey->replay_counter,
 366                   WPA_REPLAY_COUNTER_LEN);
 367         inc_byte_array(peerkey->replay_counter, WPA_REPLAY_COUNTER_LEN);
 368
 369         WPA_PUT_BE16(msg->key_data_length, kde_len);
 370         wpa_add_kde((u8 *) (msg + 1), RSN_KEY_DATA_PMKID,
 371                     peerkey->smkid, PMKID_LEN);
 372
 373         if (random_get_bytes(peerkey->inonce, WPA_NONCE_LEN)) {
 374                 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
 375                         "RSN: Failed to get random data for INonce (STK)");
 376                 os_free(mbuf);
 377                 return;
 378         }
 379         wpa_hexdump(MSG_DEBUG, "RSN: INonce for STK 4-Way Handshake",
 380                     peerkey->inonce, WPA_NONCE_LEN);
 381         os_memcpy(msg->key_nonce, peerkey->inonce, WPA_NONCE_LEN);
 382
 383         wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key STK 1/4 to " MACSTR,
 384                    MAC2STR(peerkey->addr));
 385         wpa_eapol_key_send(sm, NULL, ver, peerkey->addr, ETH_P_EAPOL,
 386                            mbuf, mlen, NULL);
 387 }
 388
 389
 390 static void wpa_supplicant_send_stk_3_of_4(struct wpa_sm *sm,
 391                                            struct wpa_peerkey *peerkey)
 392 {
 393         size_t mlen;
 394         struct wpa_eapol_key *msg;
 395         u8 *mbuf, *pos;
 396         size_t kde_len;
 397         u16 key_info, ver;
 398         be32 lifetime;
 399
 400         kde_len = peerkey->rsnie_i_len +
 401                 2 + RSN_SELECTOR_LEN + sizeof(lifetime);
 402
 403         mbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
 404                                   sizeof(*msg) + kde_len, &mlen,
 405                                   (void *) &msg);
 406         if (mbuf == NULL)
 407                 return;
 408
 409         msg->type = EAPOL_KEY_TYPE_RSN;
 410
 411         if (peerkey->cipher != WPA_CIPHER_TKIP)
 412                 ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
 413         else
 414                 ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
 415
 416         key_info = ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_ACK |
 417                 WPA_KEY_INFO_MIC | WPA_KEY_INFO_SECURE;
 418         WPA_PUT_BE16(msg->key_info, key_info);
 419
 420         if (peerkey->cipher != WPA_CIPHER_TKIP)
 421                 WPA_PUT_BE16(msg->key_length, 16);
 422         else
 423                 WPA_PUT_BE16(msg->key_length, 32);
 424
 425         os_memcpy(msg->replay_counter, peerkey->replay_counter,
 426                   WPA_REPLAY_COUNTER_LEN);
 427         inc_byte_array(peerkey->replay_counter, WPA_REPLAY_COUNTER_LEN);
 428
 429         WPA_PUT_BE16(msg->key_data_length, kde_len);
 430         pos = (u8 *) (msg + 1);
 431         pos = wpa_add_ie(pos, peerkey->rsnie_i, peerkey->rsnie_i_len);
 432         lifetime = host_to_be32(peerkey->lifetime);
 433         wpa_add_kde(pos, RSN_KEY_DATA_LIFETIME,
 434                     (u8 *) &lifetime, sizeof(lifetime));
 435
 436         os_memcpy(msg->key_nonce, peerkey->inonce, WPA_NONCE_LEN);
 437
 438         wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key STK 3/4 to " MACSTR,
 439                    MAC2STR(peerkey->addr));
 440         wpa_eapol_key_send(sm, peerkey->stk.kck, ver, peerkey->addr,
 441                            ETH_P_EAPOL, mbuf, mlen, msg->key_mic);
 442 }
 443
 444
 445 static int wpa_supplicant_process_smk_m4(struct wpa_peerkey *peerkey,
 446                                          struct wpa_eapol_ie_parse *kde)
 447 {
 448         wpa_printf(MSG_DEBUG, "RSN: Received SMK M4 (Initiator " MACSTR ")",
 449                    MAC2STR(kde->mac_addr));
 450
 451         if (os_memcmp(kde->smk + PMK_LEN, peerkey->pnonce, WPA_NONCE_LEN) != 0)
 452         {
 453                 wpa_printf(MSG_INFO, "RSN: PNonce in SMK KDE does not "
 454                            "match with the one used in SMK M3");
 455                 return -1;
 456         }
 457
 458         if (os_memcmp(kde->nonce, peerkey->inonce, WPA_NONCE_LEN) != 0) {
 459                 wpa_printf(MSG_INFO, "RSN: INonce in SMK M4 did not "
 460                            "match with the one received in SMK M2");
 461                 return -1;
 462         }
 463
 464         return 0;
 465 }
 466
 467
 468 static int wpa_supplicant_process_smk_m5(struct wpa_sm *sm,
 469                                          const unsigned char *src_addr,
 470                                          const struct wpa_eapol_key *key,
 471                                          int ver,
 472                                          struct wpa_peerkey *peerkey,
 473                                          struct wpa_eapol_ie_parse *kde)
 474 {
 475         int cipher;
 476         struct wpa_ie_data ie;
 477
 478         wpa_printf(MSG_DEBUG, "RSN: Received SMK M5 (Peer " MACSTR ")",
 479                    MAC2STR(kde->mac_addr));
 480         if (kde->rsn_ie == NULL || kde->rsn_ie_len > PEERKEY_MAX_IE_LEN ||
 481             wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0) {
 482                 wpa_printf(MSG_INFO, "RSN: No RSN IE in SMK M5");
 483                 /* TODO: abort negotiation */
 484                 return -1;
 485         }
 486
 487         if (os_memcmp(key->key_nonce, peerkey->inonce, WPA_NONCE_LEN) != 0) {
 488                 wpa_printf(MSG_INFO, "RSN: Key Nonce in SMK M5 does "
 489                            "not match with INonce used in SMK M1");
 490                 return -1;
 491         }
 492
 493         if (os_memcmp(kde->smk + PMK_LEN, peerkey->inonce, WPA_NONCE_LEN) != 0)
 494         {
 495                 wpa_printf(MSG_INFO, "RSN: INonce in SMK KDE does not "
 496                            "match with the one used in SMK M1");
 497                 return -1;
 498         }
 499
 500         os_memcpy(peerkey->rsnie_p, kde->rsn_ie, kde->rsn_ie_len);
 501         peerkey->rsnie_p_len = kde->rsn_ie_len;
 502         os_memcpy(peerkey->pnonce, kde->nonce, WPA_NONCE_LEN);
 503
 504         cipher = ie.pairwise_cipher & sm->allowed_pairwise_cipher;
 505         if (cipher & WPA_CIPHER_CCMP) {
 506                 wpa_printf(MSG_DEBUG, "RSN: Using CCMP for PeerKey");
 507                 peerkey->cipher = WPA_CIPHER_CCMP;
 508         } else if (cipher & WPA_CIPHER_GCMP) {
 509                 wpa_printf(MSG_DEBUG, "RSN: Using GCMP for PeerKey");
 510                 peerkey->cipher = WPA_CIPHER_GCMP;
 511         } else if (cipher & WPA_CIPHER_TKIP) {
 512                 wpa_printf(MSG_DEBUG, "RSN: Using TKIP for PeerKey");
 513                 peerkey->cipher = WPA_CIPHER_TKIP;
 514         } else {
 515                 wpa_printf(MSG_INFO, "RSN: SMK Peer STA " MACSTR " selected "
 516                            "unacceptable cipher", MAC2STR(kde->mac_addr));
 517                 wpa_supplicant_send_smk_error(sm, src_addr, kde->mac_addr,
 518                                               STK_MUI_SMK, STK_ERR_CPHR_NS,
 519                                               ver);
 520                 /* TODO: abort negotiation */
 521                 return -1;
 522         }
 523
 524         return 0;
 525 }
 526
 527
 528 static int wpa_supplicant_process_smk_m45(
 529         struct wpa_sm *sm, const unsigned char *src_addr,
 530         const struct wpa_eapol_key *key, size_t extra_len, int ver)
 531 {
 532         struct wpa_peerkey *peerkey;
 533         struct wpa_eapol_ie_parse kde;
 534         u32 lifetime;
 535         struct os_time now;
 536
 537         if (!sm->peerkey_enabled || sm->proto != WPA_PROTO_RSN) {
 538                 wpa_printf(MSG_DEBUG, "RSN: SMK handshake not allowed for "
 539                            "the current network");
 540                 return -1;
 541         }
 542
 543         if (wpa_supplicant_parse_ies((const u8 *) (key + 1), extra_len, &kde) <
 544             0) {
 545                 wpa_printf(MSG_INFO, "RSN: Failed to parse KDEs in SMK M4/M5");
 546                 return -1;
 547         }
 548
 549         if (kde.mac_addr == NULL || kde.mac_addr_len < ETH_ALEN ||
 550             kde.nonce == NULL || kde.nonce_len < WPA_NONCE_LEN ||
 551             kde.smk == NULL || kde.smk_len < PMK_LEN + WPA_NONCE_LEN ||
 552             kde.lifetime == NULL || kde.lifetime_len < 4) {
 553                 wpa_printf(MSG_INFO, "RSN: No MAC Address, Nonce, SMK, or "
 554                            "Lifetime KDE in SMK M4/M5");
 555                 return -1;
 556         }
 557
 558         for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) {
 559                 if (os_memcmp(peerkey->addr, kde.mac_addr, ETH_ALEN) == 0 &&
 560                     os_memcmp(peerkey->initiator ? peerkey->inonce :
 561                            peerkey->pnonce,
 562                            key->key_nonce, WPA_NONCE_LEN) == 0)
 563                         break;
 564         }
 565         if (peerkey == NULL) {
 566                 wpa_printf(MSG_INFO, "RSN: No matching SMK handshake found "
 567                            "for SMK M4/M5: peer " MACSTR,
 568                            MAC2STR(kde.mac_addr));
 569                 return -1;
 570         }
 571
 572         if (peerkey->initiator) {
 573                 if (wpa_supplicant_process_smk_m5(sm, src_addr, key, ver,
 574                                                   peerkey, &kde) < 0)
 575                         return -1;
 576         } else {
 577                 if (wpa_supplicant_process_smk_m4(peerkey, &kde) < 0)
 578                         return -1;
 579         }
 580
 581         os_memcpy(peerkey->smk, kde.smk, PMK_LEN);
 582         peerkey->smk_complete = 1;
 583         wpa_hexdump_key(MSG_DEBUG, "RSN: SMK", peerkey->smk, PMK_LEN);
 584         lifetime = WPA_GET_BE32(kde.lifetime);
 585         wpa_printf(MSG_DEBUG, "RSN: SMK lifetime %u seconds", lifetime);
 586         if (lifetime > 1000000000)
 587                 lifetime = 1000000000; /* avoid overflowing expiration time */
 588         peerkey->lifetime = lifetime;
 589         os_get_time(&now);
 590         peerkey->expiration = now.sec + lifetime;
 591         eloop_register_timeout(lifetime, 0, wpa_supplicant_smk_timeout,
 592                                sm, peerkey);
 593
 594         if (peerkey->initiator) {
 595                 rsn_smkid(peerkey->smk, peerkey->pnonce, peerkey->addr,
 596                           peerkey->inonce, sm->own_addr, peerkey->smkid,
 597                           peerkey->use_sha256);
 598                 wpa_supplicant_send_stk_1_of_4(sm, peerkey);
 599         } else {
 600                 rsn_smkid(peerkey->smk, peerkey->pnonce, sm->own_addr,
 601                           peerkey->inonce, peerkey->addr, peerkey->smkid,
 602                           peerkey->use_sha256);
 603         }
 604         wpa_hexdump(MSG_DEBUG, "RSN: SMKID", peerkey->smkid, PMKID_LEN);
 605
 606         return 0;
 607 }
 608
 609
 610 static int wpa_supplicant_process_smk_error(
 611         struct wpa_sm *sm, const unsigned char *src_addr,
 612         const struct wpa_eapol_key *key, size_t extra_len)
 613 {
 614         struct wpa_eapol_ie_parse kde;
 615         struct rsn_error_kde error;
 616         u8 peer[ETH_ALEN];
 617         u16 error_type;
 618
 619         wpa_printf(MSG_DEBUG, "RSN: Received SMK Error");
 620
 621         if (!sm->peerkey_enabled || sm->proto != WPA_PROTO_RSN) {
 622                 wpa_printf(MSG_DEBUG, "RSN: SMK handshake not allowed for "
 623                            "the current network");
 624                 return -1;
 625         }
 626
 627         if (wpa_supplicant_parse_ies((const u8 *) (key + 1), extra_len, &kde) <
 628             0) {
 629                 wpa_printf(MSG_INFO, "RSN: Failed to parse KDEs in SMK Error");
 630                 return -1;
 631         }
 632
 633         if (kde.error == NULL || kde.error_len < sizeof(error)) {
 634                 wpa_printf(MSG_INFO, "RSN: No Error KDE in SMK Error");
 635                 return -1;
 636         }
 637
 638         if (kde.mac_addr && kde.mac_addr_len >= ETH_ALEN)
 639                 os_memcpy(peer, kde.mac_addr, ETH_ALEN);
 640         else
 641                 os_memset(peer, 0, ETH_ALEN);
 642         os_memcpy(&error, kde.error, sizeof(error));
 643         error_type = be_to_host16(error.error_type);
 644         wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
 645                 "RSN: SMK Error KDE received: MUI %d error_type %d peer "
 646                 MACSTR,
 647                 be_to_host16(error.mui), error_type,
 648                 MAC2STR(peer));
 649
 650         if (kde.mac_addr &&
 651             (error_type == STK_ERR_STA_NR || error_type == STK_ERR_STA_NRSN ||
 652              error_type == STK_ERR_CPHR_NS)) {
 653                 struct wpa_peerkey *peerkey;
 654
 655                 for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) {
 656                         if (os_memcmp(peerkey->addr, kde.mac_addr, ETH_ALEN) ==
 657                             0)
 658                                 break;
 659                 }
 660                 if (peerkey == NULL) {
 661                         wpa_printf(MSG_DEBUG, "RSN: No matching SMK handshake "
 662                                    "found for SMK Error");
 663                         return -1;
 664                 }
 665                 /* TODO: abort SMK/STK handshake and remove all related keys */
 666         }
 667
 668         return 0;
 669 }
 670
 671
 672 static void wpa_supplicant_process_stk_1_of_4(struct wpa_sm *sm,
 673                                               struct wpa_peerkey *peerkey,
 674                                               const struct wpa_eapol_key *key,
 675                                               u16 ver)
 676 {
 677         struct wpa_eapol_ie_parse ie;
 678         const u8 *kde;
 679         size_t len, kde_buf_len;
 680         struct wpa_ptk *stk;
 681         u8 buf[8], *kde_buf, *pos;
 682         be32 lifetime;
 683
 684         wpa_printf(MSG_DEBUG, "RSN: RX message 1 of STK 4-Way Handshake from "
 685                    MACSTR " (ver=%d)", MAC2STR(peerkey->addr), ver);
 686
 687         os_memset(&ie, 0, sizeof(ie));
 688
 689         /* RSN: msg 1/4 should contain SMKID for the selected SMK */
 690         kde = (const u8 *) (key + 1);
 691         len = WPA_GET_BE16(key->key_data_length);
 692         wpa_hexdump(MSG_DEBUG, "RSN: msg 1/4 key data", kde, len);
 693         if (wpa_supplicant_parse_ies(kde, len, &ie) < 0 || ie.pmkid == NULL) {
 694                 wpa_printf(MSG_DEBUG, "RSN: No SMKID in STK 1/4");
 695                 return;
 696         }
 697         if (os_memcmp(ie.pmkid, peerkey->smkid, PMKID_LEN) != 0) {
 698                 wpa_hexdump(MSG_DEBUG, "RSN: Unknown SMKID in STK 1/4",
 699                             ie.pmkid, PMKID_LEN);
 700                 return;
 701         }
 702
 703         if (random_get_bytes(peerkey->pnonce, WPA_NONCE_LEN)) {
 704                 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
 705                         "RSN: Failed to get random data for PNonce");
 706                 return;
 707         }
 708         wpa_hexdump(MSG_DEBUG, "WPA: Renewed PNonce",
 709                     peerkey->pnonce, WPA_NONCE_LEN);
 710
 711         /* Calculate STK which will be stored as a temporary STK until it has
 712          * been verified when processing message 3/4. */
 713         stk = &peerkey->tstk;
 714         wpa_pmk_to_ptk(peerkey->smk, PMK_LEN, "Peer key expansion",
 715                        sm->own_addr, peerkey->addr,
 716                        peerkey->pnonce, key->key_nonce,
 717                        (u8 *) stk, sizeof(*stk),
 718                        peerkey->use_sha256);
 719         /* Supplicant: swap tx/rx Mic keys */
 720         os_memcpy(buf, stk->u.auth.tx_mic_key, 8);
 721         os_memcpy(stk->u.auth.tx_mic_key, stk->u.auth.rx_mic_key, 8);
 722         os_memcpy(stk->u.auth.rx_mic_key, buf, 8);
 723         peerkey->tstk_set = 1;
 724
 725         kde_buf_len = peerkey->rsnie_p_len +
 726                 2 + RSN_SELECTOR_LEN + sizeof(lifetime) +
 727                 2 + RSN_SELECTOR_LEN + PMKID_LEN;
 728         kde_buf = os_malloc(kde_buf_len);
 729         if (kde_buf == NULL)
 730                 return;
 731         pos = kde_buf;
 732         pos = wpa_add_ie(pos, peerkey->rsnie_p, peerkey->rsnie_p_len);
 733         lifetime = host_to_be32(peerkey->lifetime);
 734         pos = wpa_add_kde(pos, RSN_KEY_DATA_LIFETIME,
 735                           (u8 *) &lifetime, sizeof(lifetime));
 736         wpa_add_kde(pos, RSN_KEY_DATA_PMKID, peerkey->smkid, PMKID_LEN);
 737
 738         if (wpa_supplicant_send_2_of_4(sm, peerkey->addr, key, ver,
 739                                        peerkey->pnonce, kde_buf, kde_buf_len,
 740                                        stk)) {
 741                 os_free(kde_buf);
 742                 return;
 743         }
 744         os_free(kde_buf);
 745
 746         os_memcpy(peerkey->inonce, key->key_nonce, WPA_NONCE_LEN);
 747 }
 748
 749
 750 static void wpa_supplicant_update_smk_lifetime(struct wpa_sm *sm,
 751                                                struct wpa_peerkey *peerkey,
 752                                                struct wpa_eapol_ie_parse *kde)
 753 {
 754         u32 lifetime;
 755         struct os_time now;
 756
 757         if (kde->lifetime == NULL || kde->lifetime_len < sizeof(lifetime))
 758                 return;
 759
 760         lifetime = WPA_GET_BE32(kde->lifetime);
 761
 762         if (lifetime >= peerkey->lifetime) {
 763                 wpa_printf(MSG_DEBUG, "RSN: Peer used SMK lifetime %u seconds "
 764                            "which is larger than or equal to own value %u "
 765                            "seconds - ignored", lifetime, peerkey->lifetime);
 766                 return;
 767         }
 768
 769         wpa_printf(MSG_DEBUG, "RSN: Peer used shorter SMK lifetime %u seconds "
 770                    "(own was %u seconds) - updated",
 771                    lifetime, peerkey->lifetime);
 772         peerkey->lifetime = lifetime;
 773
 774         os_get_time(&now);
 775         peerkey->expiration = now.sec + lifetime;
 776         eloop_cancel_timeout(wpa_supplicant_smk_timeout, sm, peerkey);
 777         eloop_register_timeout(lifetime, 0, wpa_supplicant_smk_timeout,
 778                                sm, peerkey);
 779 }
 780
 781
 782 static void wpa_supplicant_process_stk_2_of_4(struct wpa_sm *sm,
 783                                               struct wpa_peerkey *peerkey,
 784                                               const struct wpa_eapol_key *key,
 785                                               u16 ver)
 786 {
 787         struct wpa_eapol_ie_parse kde;
 788         const u8 *keydata;
 789         size_t len;
 790
 791         wpa_printf(MSG_DEBUG, "RSN: RX message 2 of STK 4-Way Handshake from "
 792                    MACSTR " (ver=%d)", MAC2STR(peerkey->addr), ver);
 793
 794         os_memset(&kde, 0, sizeof(kde));
 795
 796         /* RSN: msg 2/4 should contain SMKID for the selected SMK and RSN IE
 797          * from the peer. It may also include Lifetime KDE. */
 798         keydata = (const u8 *) (key + 1);
 799         len = WPA_GET_BE16(key->key_data_length);
 800         wpa_hexdump(MSG_DEBUG, "RSN: msg 2/4 key data", keydata, len);
 801         if (wpa_supplicant_parse_ies(keydata, len, &kde) < 0 ||
 802             kde.pmkid == NULL || kde.rsn_ie == NULL) {
 803                 wpa_printf(MSG_DEBUG, "RSN: No SMKID or RSN IE in STK 2/4");
 804                 return;
 805         }
 806
 807         if (os_memcmp(kde.pmkid, peerkey->smkid, PMKID_LEN) != 0) {
 808                 wpa_hexdump(MSG_DEBUG, "RSN: Unknown SMKID in STK 2/4",
 809                             kde.pmkid, PMKID_LEN);
 810                 return;
 811         }
 812
 813         if (kde.rsn_ie_len != peerkey->rsnie_p_len ||
 814             os_memcmp(kde.rsn_ie, peerkey->rsnie_p, kde.rsn_ie_len) != 0) {
 815                 wpa_printf(MSG_INFO, "RSN: Peer RSN IE in SMK and STK "
 816                            "handshakes did not match");
 817                 wpa_hexdump(MSG_DEBUG, "RSN: Peer RSN IE in SMK handshake",
 818                             peerkey->rsnie_p, peerkey->rsnie_p_len);
 819                 wpa_hexdump(MSG_DEBUG, "RSN: Peer RSN IE in STK handshake",
 820                             kde.rsn_ie, kde.rsn_ie_len);
 821                 return;
 822         }
 823
 824         wpa_supplicant_update_smk_lifetime(sm, peerkey, &kde);
 825
 826         wpa_supplicant_send_stk_3_of_4(sm, peerkey);
 827         os_memcpy(peerkey->pnonce, key->key_nonce, WPA_NONCE_LEN);
 828 }
 829
 830
 831 static void wpa_supplicant_process_stk_3_of_4(struct wpa_sm *sm,
 832                                               struct wpa_peerkey *peerkey,
 833                                               const struct wpa_eapol_key *key,
 834                                               u16 ver)
 835 {
 836         struct wpa_eapol_ie_parse kde;
 837         const u8 *keydata;
 838         size_t len, key_len;
 839         const u8 *_key;
 840         u8 key_buf[32], rsc[6];
 841
 842         wpa_printf(MSG_DEBUG, "RSN: RX message 3 of STK 4-Way Handshake from "
 843                    MACSTR " (ver=%d)", MAC2STR(peerkey->addr), ver);
 844
 845         os_memset(&kde, 0, sizeof(kde));
 846
 847         /* RSN: msg 3/4 should contain Initiator RSN IE. It may also include
 848          * Lifetime KDE. */
 849         keydata = (const u8 *) (key + 1);
 850         len = WPA_GET_BE16(key->key_data_length);
 851         wpa_hexdump(MSG_DEBUG, "RSN: msg 3/4 key data", keydata, len);
 852         if (wpa_supplicant_parse_ies(keydata, len, &kde) < 0) {
 853                 wpa_printf(MSG_DEBUG, "RSN: Failed to parse key data in "
 854                            "STK 3/4");
 855                 return;
 856         }
 857
 858         if (kde.rsn_ie_len != peerkey->rsnie_i_len ||
 859             os_memcmp(kde.rsn_ie, peerkey->rsnie_i, kde.rsn_ie_len) != 0) {
 860                 wpa_printf(MSG_INFO, "RSN: Initiator RSN IE in SMK and STK "
 861                            "handshakes did not match");
 862                 wpa_hexdump(MSG_DEBUG, "RSN: Initiator RSN IE in SMK "
 863                             "handshake",
 864                             peerkey->rsnie_i, peerkey->rsnie_i_len);
 865                 wpa_hexdump(MSG_DEBUG, "RSN: Initiator RSN IE in STK "
 866                             "handshake",
 867                             kde.rsn_ie, kde.rsn_ie_len);
 868                 return;
 869         }
 870
 871         if (os_memcmp(peerkey->inonce, key->key_nonce, WPA_NONCE_LEN) != 0) {
 872                 wpa_printf(MSG_WARNING, "RSN: INonce from message 1 of STK "
 873                            "4-Way Handshake differs from 3 of STK 4-Way "
 874                            "Handshake - drop packet (src=" MACSTR ")",
 875                            MAC2STR(peerkey->addr));
 876                 return;
 877         }
 878
 879         wpa_supplicant_update_smk_lifetime(sm, peerkey, &kde);
 880
 881         if (wpa_supplicant_send_4_of_4(sm, peerkey->addr, key, ver,
 882                                        WPA_GET_BE16(key->key_info),
 883                                        NULL, 0, &peerkey->stk))
 884                 return;
 885
 886         _key = (u8 *) peerkey->stk.tk1;
 887         if (peerkey->cipher == WPA_CIPHER_TKIP) {
 888                 /* Swap Tx/Rx keys for Michael MIC */
 889                 os_memcpy(key_buf, _key, 16);
 890                 os_memcpy(key_buf + 16, peerkey->stk.u.auth.rx_mic_key, 8);
 891                 os_memcpy(key_buf + 24, peerkey->stk.u.auth.tx_mic_key, 8);
 892                 _key = key_buf;
 893                 key_len = 32;
 894         } else
 895                 key_len = 16;
 896
 897         os_memset(rsc, 0, 6);
 898         if (wpa_sm_set_key(sm, peerkey->cipher, peerkey->addr, 0, 1,
 899                            rsc, sizeof(rsc), _key, key_len) < 0) {
 900                 wpa_printf(MSG_WARNING, "RSN: Failed to set STK to the "
 901                            "driver.");
 902                 return;
 903         }
 904 }
 905
 906
 907 static void wpa_supplicant_process_stk_4_of_4(struct wpa_sm *sm,
 908                                               struct wpa_peerkey *peerkey,
 909                                               const struct wpa_eapol_key *key,
 910                                               u16 ver)
 911 {
 912         u8 rsc[6];
 913
 914         wpa_printf(MSG_DEBUG, "RSN: RX message 4 of STK 4-Way Handshake from "
 915                    MACSTR " (ver=%d)", MAC2STR(peerkey->addr), ver);
 916
 917         os_memset(rsc, 0, 6);
 918         if (wpa_sm_set_key(sm, peerkey->cipher, peerkey->addr, 0, 1,
 919                            rsc, sizeof(rsc), (u8 *) peerkey->stk.tk1,
 920                            peerkey->cipher == WPA_CIPHER_TKIP ? 32 : 16) < 0) {
 921                 wpa_printf(MSG_WARNING, "RSN: Failed to set STK to the "
 922                            "driver.");
 923                 return;
 924         }
 925 }
 926
 927
 928 /**
 929  * peerkey_verify_eapol_key_mic - Verify PeerKey MIC
 930  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 931  * @peerkey: Pointer to the PeerKey data for the peer
 932  * @key: Pointer to the EAPOL-Key frame header
 933  * @ver: Version bits from EAPOL-Key Key Info
 934  * @buf: Pointer to the beginning of EAPOL-Key frame
 935  * @len: Length of the EAPOL-Key frame
 936  * Returns: 0 on success, -1 on failure
 937  */
 938 int peerkey_verify_eapol_key_mic(struct wpa_sm *sm,
 939                                  struct wpa_peerkey *peerkey,
 940                                  struct wpa_eapol_key *key, u16 ver,
 941                                  const u8 *buf, size_t len)
 942 {
 943         u8 mic[16];
 944         int ok = 0;
 945
 946         if (peerkey->initiator && !peerkey->stk_set) {
 947                 wpa_pmk_to_ptk(peerkey->smk, PMK_LEN, "Peer key expansion",
 948                                sm->own_addr, peerkey->addr,
 949                                peerkey->inonce, key->key_nonce,
 950                                (u8 *) &peerkey->stk, sizeof(peerkey->stk),
 951                                peerkey->use_sha256);
 952                 peerkey->stk_set = 1;
 953         }
 954
 955         os_memcpy(mic, key->key_mic, 16);
 956         if (peerkey->tstk_set) {
 957                 os_memset(key->key_mic, 0, 16);
 958                 wpa_eapol_key_mic(peerkey->tstk.kck, ver, buf, len,
 959                                   key->key_mic);
 960                 if (os_memcmp(mic, key->key_mic, 16) != 0) {
 961                         wpa_printf(MSG_WARNING, "RSN: Invalid EAPOL-Key MIC "
 962                                    "when using TSTK - ignoring TSTK");
 963                 } else {
 964                         ok = 1;
 965                         peerkey->tstk_set = 0;
 966                         peerkey->stk_set = 1;
 967                         os_memcpy(&peerkey->stk, &peerkey->tstk,
 968                                   sizeof(peerkey->stk));
 969                 }
 970         }
 971
 972         if (!ok && peerkey->stk_set) {
 973                 os_memset(key->key_mic, 0, 16);
 974                 wpa_eapol_key_mic(peerkey->stk.kck, ver, buf, len,
 975                                   key->key_mic);
 976                 if (os_memcmp(mic, key->key_mic, 16) != 0) {
 977                         wpa_printf(MSG_WARNING, "RSN: Invalid EAPOL-Key MIC "
 978                                    "- dropping packet");
 979                         return -1;
 980                 }
 981                 ok = 1;
 982         }
 983
 984         if (!ok) {
 985                 wpa_printf(MSG_WARNING, "RSN: Could not verify EAPOL-Key MIC "
 986                            "- dropping packet");
 987                 return -1;
 988         }
 989
 990         os_memcpy(peerkey->replay_counter, key->replay_counter,
 991                   WPA_REPLAY_COUNTER_LEN);
 992         peerkey->replay_counter_set = 1;
 993         return 0;
 994 }
 995
 996
 997 /**
 998  * wpa_sm_stkstart - Send EAPOL-Key Request for STK handshake (STK M1)
 999  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1000  * @peer: MAC address of the peer STA
1001  * Returns: 0 on success, or -1 on failure
1002  *
1003  * Send an EAPOL-Key Request to the current authenticator to start STK
1004  * handshake with the peer.
1005  */
1006 int wpa_sm_stkstart(struct wpa_sm *sm, const u8 *peer)
1007 {
1008         size_t rlen, kde_len;
1009         struct wpa_eapol_key *req;
1010         int key_info, ver;
1011         u8 bssid[ETH_ALEN], *rbuf, *pos, *count_pos;
1012         u16 count;
1013         struct rsn_ie_hdr *hdr;
1014         struct wpa_peerkey *peerkey;
1015         struct wpa_ie_data ie;
1016
1017         if (sm->proto != WPA_PROTO_RSN || !sm->ptk_set || !sm->peerkey_enabled)
1018                 return -1;
1019
1020         if (sm->ap_rsn_ie &&
1021             wpa_parse_wpa_ie_rsn(sm->ap_rsn_ie, sm->ap_rsn_ie_len, &ie) == 0 &&
1022             !(ie.capabilities & WPA_CAPABILITY_PEERKEY_ENABLED)) {
1023                 wpa_printf(MSG_DEBUG, "RSN: Current AP does not support STK");
1024                 return -1;
1025         }
1026
1027         if (sm->pairwise_cipher != WPA_CIPHER_TKIP)
1028                 ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
1029         else
1030                 ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
1031
1032         if (wpa_sm_get_bssid(sm, bssid) < 0) {
1033                 wpa_printf(MSG_WARNING, "Failed to read BSSID for EAPOL-Key "
1034                            "SMK M1");
1035                 return -1;
1036         }
1037
1038         /* TODO: find existing entry and if found, use that instead of adding
1039          * a new one */
1040         peerkey = os_zalloc(sizeof(*peerkey));
1041         if (peerkey == NULL)
1042                 return -1;
1043         peerkey->initiator = 1;
1044         os_memcpy(peerkey->addr, peer, ETH_ALEN);
1045 #ifdef CONFIG_IEEE80211W
1046         if (wpa_key_mgmt_sha256(sm->key_mgmt))
1047                 peerkey->use_sha256 = 1;
1048 #endif /* CONFIG_IEEE80211W */
1049
1050         /* SMK M1:
1051          * EAPOL-Key(S=1, M=1, A=0, I=0, K=0, SM=1, KeyRSC=0, Nonce=INonce,
1052          *           MIC=MIC, DataKDs=(RSNIE_I, MAC_P KDE))
1053          */
1054
1055         hdr = (struct rsn_ie_hdr *) peerkey->rsnie_i;
1056         hdr->elem_id = WLAN_EID_RSN;
1057         WPA_PUT_LE16(hdr->version, RSN_VERSION);
1058         pos = (u8 *) (hdr + 1);
1059         /* Group Suite can be anything for SMK RSN IE; receiver will just
1060          * ignore it. */
1061         RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
1062         pos += RSN_SELECTOR_LEN;
1063         count_pos = pos;
1064         pos += 2;
1065
1066         count = 0;
1067         if (sm->allowed_pairwise_cipher & WPA_CIPHER_CCMP) {
1068                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
1069                 pos += RSN_SELECTOR_LEN;
1070                 count++;
1071         }
1072         if (sm->allowed_pairwise_cipher & WPA_CIPHER_GCMP) {
1073                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_GCMP);
1074                 pos += RSN_SELECTOR_LEN;
1075                 count++;
1076         }
1077         if (sm->allowed_pairwise_cipher & WPA_CIPHER_TKIP) {
1078                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
1079                 pos += RSN_SELECTOR_LEN;
1080                 count++;
1081         }
1082         WPA_PUT_LE16(count_pos, count);
1083
1084         hdr->len = (pos - peerkey->rsnie_i) - 2;
1085         peerkey->rsnie_i_len = pos - peerkey->rsnie_i;
1086         wpa_hexdump(MSG_DEBUG, "WPA: RSN IE for SMK handshake",
1087                     peerkey->rsnie_i, peerkey->rsnie_i_len);
1088
1089         kde_len = peerkey->rsnie_i_len + 2 + RSN_SELECTOR_LEN + ETH_ALEN;
1090
1091         rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
1092                                   sizeof(*req) + kde_len, &rlen,
1093                                   (void *) &req);
1094         if (rbuf == NULL) {
1095                 wpa_supplicant_peerkey_free(sm, peerkey);
1096                 return -1;
1097         }
1098
1099         req->type = EAPOL_KEY_TYPE_RSN;
1100         key_info = WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_MIC |
1101                 WPA_KEY_INFO_SECURE | WPA_KEY_INFO_REQUEST | ver;
1102         WPA_PUT_BE16(req->key_info, key_info);
1103         WPA_PUT_BE16(req->key_length, 0);
1104         os_memcpy(req->replay_counter, sm->request_counter,
1105                   WPA_REPLAY_COUNTER_LEN);
1106         inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN);
1107
1108         if (random_get_bytes(peerkey->inonce, WPA_NONCE_LEN)) {
1109                 wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
1110                         "WPA: Failed to get random data for INonce");
1111                 os_free(rbuf);
1112                 wpa_supplicant_peerkey_free(sm, peerkey);
1113                 return -1;
1114         }
1115         os_memcpy(req->key_nonce, peerkey->inonce, WPA_NONCE_LEN);
1116         wpa_hexdump(MSG_DEBUG, "WPA: INonce for SMK handshake",
1117                     req->key_nonce, WPA_NONCE_LEN);
1118
1119         WPA_PUT_BE16(req->key_data_length, (u16) kde_len);
1120         pos = (u8 *) (req + 1);
1121
1122         /* Initiator RSN IE */
1123         pos = wpa_add_ie(pos, peerkey->rsnie_i, peerkey->rsnie_i_len);
1124         /* Peer MAC address KDE */
1125         wpa_add_kde(pos, RSN_KEY_DATA_MAC_ADDR, peer, ETH_ALEN);
1126
1127         wpa_printf(MSG_INFO, "RSN: Sending EAPOL-Key SMK M1 Request (peer "
1128                    MACSTR ")", MAC2STR(peer));
1129         wpa_eapol_key_send(sm, sm->ptk.kck, ver, bssid, ETH_P_EAPOL,
1130                            rbuf, rlen, req->key_mic);
1131
1132         peerkey->next = sm->peerkey;
1133         sm->peerkey = peerkey;
1134
1135         return 0;
1136 }
1137
1138
1139 /**
1140  * peerkey_deinit - Free PeerKey values
1141  * @sm: Pointer to WPA state machine data from wpa_sm_init()
1142  */
1143 void peerkey_deinit(struct wpa_sm *sm)
1144 {
1145         struct wpa_peerkey *prev, *peerkey = sm->peerkey;
1146         while (peerkey) {
1147                 prev = peerkey;
1148                 peerkey = peerkey->next;
1149                 os_free(prev);
1150         }
1151         sm->peerkey = NULL;
1152 }
1153
1154
1155 void peerkey_rx_eapol_4way(struct wpa_sm *sm, struct wpa_peerkey *peerkey,
1156                            struct wpa_eapol_key *key, u16 key_info, u16 ver)
1157 {
1158         if ((key_info & (WPA_KEY_INFO_MIC | WPA_KEY_INFO_ACK)) ==
1159             (WPA_KEY_INFO_MIC | WPA_KEY_INFO_ACK)) {
1160                 /* 3/4 STK 4-Way Handshake */
1161                 wpa_supplicant_process_stk_3_of_4(sm, peerkey, key, ver);
1162         } else if (key_info & WPA_KEY_INFO_ACK) {
1163                 /* 1/4 STK 4-Way Handshake */
1164                 wpa_supplicant_process_stk_1_of_4(sm, peerkey, key, ver);
1165         } else if (key_info & WPA_KEY_INFO_SECURE) {
1166                 /* 4/4 STK 4-Way Handshake */
1167                 wpa_supplicant_process_stk_4_of_4(sm, peerkey, key, ver);
1168         } else {
1169                 /* 2/4 STK 4-Way Handshake */
1170                 wpa_supplicant_process_stk_2_of_4(sm, peerkey, key, ver);
1171         }
1172 }
1173
1174
1175 void peerkey_rx_eapol_smk(struct wpa_sm *sm, const u8 *src_addr,
1176                           struct wpa_eapol_key *key, size_t extra_len,
1177                           u16 key_info, u16 ver)
1178 {
1179         if (key_info & WPA_KEY_INFO_ERROR) {
1180                 /* SMK Error */
1181                 wpa_supplicant_process_smk_error(sm, src_addr, key, extra_len);
1182         } else if (key_info & WPA_KEY_INFO_ACK) {
1183                 /* SMK M2 */
1184                 wpa_supplicant_process_smk_m2(sm, src_addr, key, extra_len,
1185                                               ver);
1186         } else {
1187                 /* SMK M4 or M5 */
1188                 wpa_supplicant_process_smk_m45(sm, src_addr, key, extra_len,
1189                                                ver);
1190         }
1191 }
1192
1193 #endif /* CONFIG_PEERKEY */