src/rsn_supp/wpa_ie.c

   1 /*
   2  * wpa_supplicant - WPA/RSN IE and KDE processing
   3  * Copyright (c) 2003-2008, 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 #include "common.h"
  12 #include "wpa.h"
  13 #include "pmksa_cache.h"
  14 #include "common/ieee802_11_defs.h"
  15 #include "wpa_i.h"
  16 #include "wpa_ie.h"
  17
  18
  19 /**
  20  * wpa_parse_wpa_ie - Parse WPA/RSN IE
  21  * @wpa_ie: Pointer to WPA or RSN IE
  22  * @wpa_ie_len: Length of the WPA/RSN IE
  23  * @data: Pointer to data area for parsing results
  24  * Returns: 0 on success, -1 on failure
  25  *
  26  * Parse the contents of WPA or RSN IE and write the parsed data into data.
  27  */
  28 int wpa_parse_wpa_ie(const u8 *wpa_ie, size_t wpa_ie_len,
  29                      struct wpa_ie_data *data)
  30 {
  31         if (wpa_ie_len >= 1 && wpa_ie[0] == WLAN_EID_RSN)
  32                 return wpa_parse_wpa_ie_rsn(wpa_ie, wpa_ie_len, data);
  33         else
  34                 return wpa_parse_wpa_ie_wpa(wpa_ie, wpa_ie_len, data);
  35 }
  36
  37
  38 static int wpa_gen_wpa_ie_wpa(u8 *wpa_ie, size_t wpa_ie_len,
  39                               int pairwise_cipher, int group_cipher,
  40                               int key_mgmt)
  41 {
  42         u8 *pos;
  43         struct wpa_ie_hdr *hdr;
  44         u32 suite;
  45
  46         if (wpa_ie_len < sizeof(*hdr) + WPA_SELECTOR_LEN +
  47             2 + WPA_SELECTOR_LEN + 2 + WPA_SELECTOR_LEN)
  48                 return -1;
  49
  50         hdr = (struct wpa_ie_hdr *) wpa_ie;
  51         hdr->elem_id = WLAN_EID_VENDOR_SPECIFIC;
  52         RSN_SELECTOR_PUT(hdr->oui, WPA_OUI_TYPE);
  53         WPA_PUT_LE16(hdr->version, WPA_VERSION);
  54         pos = (u8 *) (hdr + 1);
  55
  56         suite = wpa_cipher_to_suite(WPA_PROTO_WPA, group_cipher);
  57         if (suite == 0) {
  58                 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
  59                            group_cipher);
  60                 return -1;
  61         }
  62         RSN_SELECTOR_PUT(pos, suite);
  63         pos += WPA_SELECTOR_LEN;
  64
  65         *pos++ = 1;
  66         *pos++ = 0;
  67         suite = wpa_cipher_to_suite(WPA_PROTO_WPA, pairwise_cipher);
  68         if (suite == 0 ||
  69             (!wpa_cipher_valid_pairwise(pairwise_cipher) &&
  70              pairwise_cipher != WPA_CIPHER_NONE)) {
  71                 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
  72                            pairwise_cipher);
  73                 return -1;
  74         }
  75         RSN_SELECTOR_PUT(pos, suite);
  76         pos += WPA_SELECTOR_LEN;
  77
  78         *pos++ = 1;
  79         *pos++ = 0;
  80         if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
  81                 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_UNSPEC_802_1X);
  82         } else if (key_mgmt == WPA_KEY_MGMT_PSK) {
  83                 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X);
  84         } else if (key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
  85                 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_NONE);
  86         } else if (key_mgmt == WPA_KEY_MGMT_CCKM) {
  87                 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_CCKM);
  88         } else {
  89                 wpa_printf(MSG_WARNING, "Invalid key management type (%d).",
  90                            key_mgmt);
  91                 return -1;
  92         }
  93         pos += WPA_SELECTOR_LEN;
  94
  95         /* WPA Capabilities; use defaults, so no need to include it */
  96
  97         hdr->len = (pos - wpa_ie) - 2;
  98
  99         WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len);
 100
 101         return pos - wpa_ie;
 102 }
 103
 104
 105 static int wpa_gen_wpa_ie_rsn(u8 *rsn_ie, size_t rsn_ie_len,
 106                               int pairwise_cipher, int group_cipher,
 107                               int key_mgmt, int mgmt_group_cipher,
 108                               struct wpa_sm *sm)
 109 {
 110         u8 *pos;
 111         struct rsn_ie_hdr *hdr;
 112         u16 capab;
 113         u32 suite;
 114
 115         if (rsn_ie_len < sizeof(*hdr) + RSN_SELECTOR_LEN +
 116             2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN + 2 +
 117             (sm->cur_pmksa ? 2 + PMKID_LEN : 0)) {
 118                 wpa_printf(MSG_DEBUG, "RSN: Too short IE buffer (%lu bytes)",
 119                            (unsigned long) rsn_ie_len);
 120                 return -1;
 121         }
 122
 123         hdr = (struct rsn_ie_hdr *) rsn_ie;
 124         hdr->elem_id = WLAN_EID_RSN;
 125         WPA_PUT_LE16(hdr->version, RSN_VERSION);
 126         pos = (u8 *) (hdr + 1);
 127
 128         suite = wpa_cipher_to_suite(WPA_PROTO_RSN, group_cipher);
 129         if (suite == 0) {
 130                 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
 131                            group_cipher);
 132                 return -1;
 133         }
 134         RSN_SELECTOR_PUT(pos, suite);
 135         pos += RSN_SELECTOR_LEN;
 136
 137         *pos++ = 1;
 138         *pos++ = 0;
 139         suite = wpa_cipher_to_suite(WPA_PROTO_RSN, pairwise_cipher);
 140         if (suite == 0 ||
 141             (!wpa_cipher_valid_pairwise(pairwise_cipher) &&
 142              pairwise_cipher != WPA_CIPHER_NONE)) {
 143                 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
 144                            pairwise_cipher);
 145                 return -1;
 146         }
 147         RSN_SELECTOR_PUT(pos, suite);
 148         pos += RSN_SELECTOR_LEN;
 149
 150         *pos++ = 1;
 151         *pos++ = 0;
 152         if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
 153                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_UNSPEC_802_1X);
 154         } else if (key_mgmt == WPA_KEY_MGMT_PSK) {
 155                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X);
 156         } else if (key_mgmt == WPA_KEY_MGMT_CCKM) {
 157                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_CCKM);
 158 #ifdef CONFIG_IEEE80211R
 159         } else if (key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) {
 160                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
 161         } else if (key_mgmt == WPA_KEY_MGMT_FT_PSK) {
 162                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
 163 #endif /* CONFIG_IEEE80211R */
 164 #ifdef CONFIG_IEEE80211W
 165         } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SHA256) {
 166                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SHA256);
 167         } else if (key_mgmt == WPA_KEY_MGMT_PSK_SHA256) {
 168                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_SHA256);
 169 #endif /* CONFIG_IEEE80211W */
 170 #ifdef CONFIG_SAE
 171         } else if (key_mgmt == WPA_KEY_MGMT_SAE) {
 172                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_SAE);
 173         } else if (key_mgmt == WPA_KEY_MGMT_FT_SAE) {
 174                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
 175 #endif /* CONFIG_SAE */
 176         } else {
 177                 wpa_printf(MSG_WARNING, "Invalid key management type (%d).",
 178                            key_mgmt);
 179                 return -1;
 180         }
 181         pos += RSN_SELECTOR_LEN;
 182
 183         /* RSN Capabilities */
 184         capab = 0;
 185 #ifdef CONFIG_IEEE80211W
 186         if (sm->mfp)
 187                 capab |= WPA_CAPABILITY_MFPC;
 188         if (sm->mfp == 2)
 189                 capab |= WPA_CAPABILITY_MFPR;
 190 #endif /* CONFIG_IEEE80211W */
 191         WPA_PUT_LE16(pos, capab);
 192         pos += 2;
 193
 194         if (sm->cur_pmksa) {
 195                 /* PMKID Count (2 octets, little endian) */
 196                 *pos++ = 1;
 197                 *pos++ = 0;
 198                 /* PMKID */
 199                 os_memcpy(pos, sm->cur_pmksa->pmkid, PMKID_LEN);
 200                 pos += PMKID_LEN;
 201         }
 202
 203 #ifdef CONFIG_IEEE80211W
 204         if (wpa_cipher_valid_mgmt_group(mgmt_group_cipher)) {
 205                 if (!sm->cur_pmksa) {
 206                         /* PMKID Count */
 207                         WPA_PUT_LE16(pos, 0);
 208                         pos += 2;
 209                 }
 210
 211                 /* Management Group Cipher Suite */
 212                 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
 213                                                           mgmt_group_cipher));
 214                 pos += RSN_SELECTOR_LEN;
 215         }
 216 #endif /* CONFIG_IEEE80211W */
 217
 218         hdr->len = (pos - rsn_ie) - 2;
 219
 220         WPA_ASSERT((size_t) (pos - rsn_ie) <= rsn_ie_len);
 221
 222         return pos - rsn_ie;
 223 }
 224
 225
 226 #ifdef CONFIG_HS20
 227 static int wpa_gen_wpa_ie_osen(u8 *wpa_ie, size_t wpa_ie_len,
 228                                int pairwise_cipher, int group_cipher,
 229                                int key_mgmt)
 230 {
 231         u8 *pos, *len;
 232         u32 suite;
 233
 234         if (wpa_ie_len < 2 + 4 + RSN_SELECTOR_LEN +
 235             2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN)
 236                 return -1;
 237
 238         pos = wpa_ie;
 239         *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 240         len = pos++; /* to be filled */
 241         WPA_PUT_BE24(pos, OUI_WFA);
 242         pos += 3;
 243         *pos++ = HS20_OSEN_OUI_TYPE;
 244
 245         /* Group Data Cipher Suite */
 246         suite = wpa_cipher_to_suite(WPA_PROTO_RSN, group_cipher);
 247         if (suite == 0) {
 248                 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
 249                            group_cipher);
 250                 return -1;
 251         }
 252         RSN_SELECTOR_PUT(pos, suite);
 253         pos += RSN_SELECTOR_LEN;
 254
 255         /* Pairwise Cipher Suite Count and List */
 256         WPA_PUT_LE16(pos, 1);
 257         pos += 2;
 258         suite = wpa_cipher_to_suite(WPA_PROTO_RSN, pairwise_cipher);
 259         if (suite == 0 ||
 260             (!wpa_cipher_valid_pairwise(pairwise_cipher) &&
 261              pairwise_cipher != WPA_CIPHER_NONE)) {
 262                 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
 263                            pairwise_cipher);
 264                 return -1;
 265         }
 266         RSN_SELECTOR_PUT(pos, suite);
 267         pos += RSN_SELECTOR_LEN;
 268
 269         /* AKM Suite Count and List */
 270         WPA_PUT_LE16(pos, 1);
 271         pos += 2;
 272         RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_OSEN);
 273         pos += RSN_SELECTOR_LEN;
 274
 275         *len = pos - len - 1;
 276
 277         WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len);
 278
 279         return pos - wpa_ie;
 280 }
 281 #endif /* CONFIG_HS20 */
 282
 283
 284 /**
 285  * wpa_gen_wpa_ie - Generate WPA/RSN IE based on current security policy
 286  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 287  * @wpa_ie: Pointer to memory area for the generated WPA/RSN IE
 288  * @wpa_ie_len: Maximum length of the generated WPA/RSN IE
 289  * Returns: Length of the generated WPA/RSN IE or -1 on failure
 290  */
 291 int wpa_gen_wpa_ie(struct wpa_sm *sm, u8 *wpa_ie, size_t wpa_ie_len)
 292 {
 293         if (sm->proto == WPA_PROTO_RSN)
 294                 return wpa_gen_wpa_ie_rsn(wpa_ie, wpa_ie_len,
 295                                           sm->pairwise_cipher,
 296                                           sm->group_cipher,
 297                                           sm->key_mgmt, sm->mgmt_group_cipher,
 298                                           sm);
 299 #ifdef CONFIG_HS20
 300         else if (sm->proto == WPA_PROTO_OSEN)
 301                 return wpa_gen_wpa_ie_osen(wpa_ie, wpa_ie_len,
 302                                            sm->pairwise_cipher,
 303                                            sm->group_cipher,
 304                                            sm->key_mgmt);
 305 #endif /* CONFIG_HS20 */
 306         else
 307                 return wpa_gen_wpa_ie_wpa(wpa_ie, wpa_ie_len,
 308                                           sm->pairwise_cipher,
 309                                           sm->group_cipher,
 310                                           sm->key_mgmt);
 311 }
 312
 313
 314 /**
 315  * wpa_parse_vendor_specific - Parse Vendor Specific IEs
 316  * @pos: Pointer to the IE header
 317  * @end: Pointer to the end of the Key Data buffer
 318  * @ie: Pointer to parsed IE data
 319  * Returns: 0 on success, 1 if end mark is found, -1 on failure
 320  */
 321 static int wpa_parse_vendor_specific(const u8 *pos, const u8 *end,
 322                                      struct wpa_eapol_ie_parse *ie)
 323 {
 324         unsigned int oui;
 325
 326         if (pos[1] < 4) {
 327                 wpa_printf(MSG_MSGDUMP, "Too short vendor specific IE ignored (len=%u)",
 328                            pos[1]);
 329                 return 1;
 330         }
 331
 332         oui = WPA_GET_BE24(&pos[2]);
 333         if (oui == OUI_MICROSOFT && pos[5] == WMM_OUI_TYPE && pos[1] > 4) {
 334                 if (pos[6] == WMM_OUI_SUBTYPE_INFORMATION_ELEMENT) {
 335                         ie->wmm = &pos[2];
 336                         ie->wmm_len = pos[1];
 337                         wpa_hexdump(MSG_DEBUG, "WPA: WMM IE",
 338                                     ie->wmm, ie->wmm_len);
 339                 } else if (pos[6] == WMM_OUI_SUBTYPE_PARAMETER_ELEMENT) {
 340                         ie->wmm = &pos[2];
 341                         ie->wmm_len = pos[1];
 342                         wpa_hexdump(MSG_DEBUG, "WPA: WMM Parameter Element",
 343                                     ie->wmm, ie->wmm_len);
 344                 }
 345         }
 346         return 0;
 347 }
 348
 349
 350 /**
 351  * wpa_parse_generic - Parse EAPOL-Key Key Data Generic IEs
 352  * @pos: Pointer to the IE header
 353  * @end: Pointer to the end of the Key Data buffer
 354  * @ie: Pointer to parsed IE data
 355  * Returns: 0 on success, 1 if end mark is found, -1 on failure
 356  */
 357 static int wpa_parse_generic(const u8 *pos, const u8 *end,
 358                              struct wpa_eapol_ie_parse *ie)
 359 {
 360         if (pos[1] == 0)
 361                 return 1;
 362
 363         if (pos[1] >= 6 &&
 364             RSN_SELECTOR_GET(pos + 2) == WPA_OUI_TYPE &&
 365             pos[2 + WPA_SELECTOR_LEN] == 1 &&
 366             pos[2 + WPA_SELECTOR_LEN + 1] == 0) {
 367                 ie->wpa_ie = pos;
 368                 ie->wpa_ie_len = pos[1] + 2;
 369                 wpa_hexdump(MSG_DEBUG, "WPA: WPA IE in EAPOL-Key",
 370                             ie->wpa_ie, ie->wpa_ie_len);
 371                 return 0;
 372         }
 373
 374         if (pos + 1 + RSN_SELECTOR_LEN < end &&
 375             pos[1] >= RSN_SELECTOR_LEN + PMKID_LEN &&
 376             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_PMKID) {
 377                 ie->pmkid = pos + 2 + RSN_SELECTOR_LEN;
 378                 wpa_hexdump(MSG_DEBUG, "WPA: PMKID in EAPOL-Key",
 379                             pos, pos[1] + 2);
 380                 return 0;
 381         }
 382
 383         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 384             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_GROUPKEY) {
 385                 ie->gtk = pos + 2 + RSN_SELECTOR_LEN;
 386                 ie->gtk_len = pos[1] - RSN_SELECTOR_LEN;
 387                 wpa_hexdump_key(MSG_DEBUG, "WPA: GTK in EAPOL-Key",
 388                                 pos, pos[1] + 2);
 389                 return 0;
 390         }
 391
 392         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 393             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_MAC_ADDR) {
 394                 ie->mac_addr = pos + 2 + RSN_SELECTOR_LEN;
 395                 ie->mac_addr_len = pos[1] - RSN_SELECTOR_LEN;
 396                 wpa_hexdump(MSG_DEBUG, "WPA: MAC Address in EAPOL-Key",
 397                             pos, pos[1] + 2);
 398                 return 0;
 399         }
 400
 401 #ifdef CONFIG_PEERKEY
 402         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 403             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_SMK) {
 404                 ie->smk = pos + 2 + RSN_SELECTOR_LEN;
 405                 ie->smk_len = pos[1] - RSN_SELECTOR_LEN;
 406                 wpa_hexdump_key(MSG_DEBUG, "WPA: SMK in EAPOL-Key",
 407                                 pos, pos[1] + 2);
 408                 return 0;
 409         }
 410
 411         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 412             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_NONCE) {
 413                 ie->nonce = pos + 2 + RSN_SELECTOR_LEN;
 414                 ie->nonce_len = pos[1] - RSN_SELECTOR_LEN;
 415                 wpa_hexdump(MSG_DEBUG, "WPA: Nonce in EAPOL-Key",
 416                             pos, pos[1] + 2);
 417                 return 0;
 418         }
 419
 420         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 421             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_LIFETIME) {
 422                 ie->lifetime = pos + 2 + RSN_SELECTOR_LEN;
 423                 ie->lifetime_len = pos[1] - RSN_SELECTOR_LEN;
 424                 wpa_hexdump(MSG_DEBUG, "WPA: Lifetime in EAPOL-Key",
 425                             pos, pos[1] + 2);
 426                 return 0;
 427         }
 428
 429         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 430             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_ERROR) {
 431                 ie->error = pos + 2 + RSN_SELECTOR_LEN;
 432                 ie->error_len = pos[1] - RSN_SELECTOR_LEN;
 433                 wpa_hexdump(MSG_DEBUG, "WPA: Error in EAPOL-Key",
 434                             pos, pos[1] + 2);
 435                 return 0;
 436         }
 437 #endif /* CONFIG_PEERKEY */
 438
 439 #ifdef CONFIG_IEEE80211W
 440         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 441             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_IGTK) {
 442                 ie->igtk = pos + 2 + RSN_SELECTOR_LEN;
 443                 ie->igtk_len = pos[1] - RSN_SELECTOR_LEN;
 444                 wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK in EAPOL-Key",
 445                                 pos, pos[1] + 2);
 446                 return 0;
 447         }
 448 #endif /* CONFIG_IEEE80211W */
 449
 450 #ifdef CONFIG_P2P
 451         if (pos[1] >= RSN_SELECTOR_LEN + 1 &&
 452             RSN_SELECTOR_GET(pos + 2) == WFA_KEY_DATA_IP_ADDR_REQ) {
 453                 ie->ip_addr_req = pos + 2 + RSN_SELECTOR_LEN;
 454                 wpa_hexdump(MSG_DEBUG, "WPA: IP Address Request in EAPOL-Key",
 455                             ie->ip_addr_req, pos[1] - RSN_SELECTOR_LEN);
 456                 return 0;
 457         }
 458
 459         if (pos[1] >= RSN_SELECTOR_LEN + 3 * 4 &&
 460             RSN_SELECTOR_GET(pos + 2) == WFA_KEY_DATA_IP_ADDR_ALLOC) {
 461                 ie->ip_addr_alloc = pos + 2 + RSN_SELECTOR_LEN;
 462                 wpa_hexdump(MSG_DEBUG,
 463                             "WPA: IP Address Allocation in EAPOL-Key",
 464                             ie->ip_addr_alloc, pos[1] - RSN_SELECTOR_LEN);
 465                 return 0;
 466         }
 467 #endif /* CONFIG_P2P */
 468
 469         return 0;
 470 }
 471
 472
 473 /**
 474  * wpa_supplicant_parse_ies - Parse EAPOL-Key Key Data IEs
 475  * @buf: Pointer to the Key Data buffer
 476  * @len: Key Data Length
 477  * @ie: Pointer to parsed IE data
 478  * Returns: 0 on success, -1 on failure
 479  */
 480 int wpa_supplicant_parse_ies(const u8 *buf, size_t len,
 481                              struct wpa_eapol_ie_parse *ie)
 482 {
 483         const u8 *pos, *end;
 484         int ret = 0;
 485
 486         os_memset(ie, 0, sizeof(*ie));
 487         for (pos = buf, end = pos + len; pos + 1 < end; pos += 2 + pos[1]) {
 488                 if (pos[0] == 0xdd &&
 489                     ((pos == buf + len - 1) || pos[1] == 0)) {
 490                         /* Ignore padding */
 491                         break;
 492                 }
 493                 if (pos + 2 + pos[1] > end) {
 494                         wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key Key Data "
 495                                    "underflow (ie=%d len=%d pos=%d)",
 496                                    pos[0], pos[1], (int) (pos - buf));
 497                         wpa_hexdump_key(MSG_DEBUG, "WPA: Key Data",
 498                                         buf, len);
 499                         ret = -1;
 500                         break;
 501                 }
 502                 if (*pos == WLAN_EID_RSN) {
 503                         ie->rsn_ie = pos;
 504                         ie->rsn_ie_len = pos[1] + 2;
 505                         wpa_hexdump(MSG_DEBUG, "WPA: RSN IE in EAPOL-Key",
 506                                     ie->rsn_ie, ie->rsn_ie_len);
 507                 } else if (*pos == WLAN_EID_MOBILITY_DOMAIN) {
 508                         ie->mdie = pos;
 509                         ie->mdie_len = pos[1] + 2;
 510                         wpa_hexdump(MSG_DEBUG, "WPA: MDIE in EAPOL-Key",
 511                                     ie->mdie, ie->mdie_len);
 512                 } else if (*pos == WLAN_EID_FAST_BSS_TRANSITION) {
 513                         ie->ftie = pos;
 514                         ie->ftie_len = pos[1] + 2;
 515                         wpa_hexdump(MSG_DEBUG, "WPA: FTIE in EAPOL-Key",
 516                                     ie->ftie, ie->ftie_len);
 517                 } else if (*pos == WLAN_EID_TIMEOUT_INTERVAL && pos[1] >= 5) {
 518                         if (pos[2] == WLAN_TIMEOUT_REASSOC_DEADLINE) {
 519                                 ie->reassoc_deadline = pos;
 520                                 wpa_hexdump(MSG_DEBUG, "WPA: Reassoc Deadline "
 521                                             "in EAPOL-Key",
 522                                             ie->reassoc_deadline, pos[1] + 2);
 523                         } else if (pos[2] == WLAN_TIMEOUT_KEY_LIFETIME) {
 524                                 ie->key_lifetime = pos;
 525                                 wpa_hexdump(MSG_DEBUG, "WPA: KeyLifetime "
 526                                             "in EAPOL-Key",
 527                                             ie->key_lifetime, pos[1] + 2);
 528                         } else {
 529                                 wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized "
 530                                             "EAPOL-Key Key Data IE",
 531                                             pos, 2 + pos[1]);
 532                         }
 533                 } else if (*pos == WLAN_EID_LINK_ID) {
 534                         if (pos[1] >= 18) {
 535                                 ie->lnkid = pos;
 536                                 ie->lnkid_len = pos[1] + 2;
 537                         }
 538                 } else if (*pos == WLAN_EID_EXT_CAPAB) {
 539                         ie->ext_capab = pos;
 540                         ie->ext_capab_len = pos[1] + 2;
 541                 } else if (*pos == WLAN_EID_SUPP_RATES) {
 542                         ie->supp_rates = pos;
 543                         ie->supp_rates_len = pos[1] + 2;
 544                 } else if (*pos == WLAN_EID_EXT_SUPP_RATES) {
 545                         ie->ext_supp_rates = pos;
 546                         ie->ext_supp_rates_len = pos[1] + 2;
 547                 } else if (*pos == WLAN_EID_HT_CAP) {
 548                         ie->ht_capabilities = pos + 2;
 549                         ie->ht_capabilities_len = pos[1];
 550                 } else if (*pos == WLAN_EID_VHT_AID) {
 551                         if (pos[1] >= 2)
 552                                 ie->aid = WPA_GET_LE16(pos + 2);
 553                 } else if (*pos == WLAN_EID_VHT_CAP) {
 554                         ie->vht_capabilities = pos + 2;
 555                         ie->vht_capabilities_len = pos[1];
 556                 } else if (*pos == WLAN_EID_QOS && pos[1] >= 1) {
 557                         ie->qosinfo = pos[2];
 558                 } else if (*pos == WLAN_EID_SUPPORTED_CHANNELS) {
 559                         ie->supp_channels = pos + 2;
 560                         ie->supp_channels_len = pos[1];
 561                 } else if (*pos == WLAN_EID_SUPPORTED_OPERATING_CLASSES) {
 562                         /*
 563                          * The value of the Length field of the Supported
 564                          * Operating Classes element is between 2 and 253.
 565                          * Silently skip invalid elements to avoid interop
 566                          * issues when trying to use the value.
 567                          */
 568                         if (pos[1] >= 2 && pos[1] <= 253) {
 569                                 ie->supp_oper_classes = pos + 2;
 570                                 ie->supp_oper_classes_len = pos[1];
 571                         }
 572                 } else if (*pos == WLAN_EID_VENDOR_SPECIFIC) {
 573                         ret = wpa_parse_generic(pos, end, ie);
 574                         if (ret < 0)
 575                                 break;
 576                         if (ret > 0) {
 577                                 ret = 0;
 578                                 break;
 579                         }
 580
 581                         ret = wpa_parse_vendor_specific(pos, end, ie);
 582                         if (ret < 0)
 583                                 break;
 584                         if (ret > 0) {
 585                                 ret = 0;
 586                                 break;
 587                         }
 588                 } else {
 589                         wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized EAPOL-Key "
 590                                     "Key Data IE", pos, 2 + pos[1]);
 591                 }
 592         }
 593
 594         return ret;
 595 }