contrib/wpa/src/rsn_supp/wpa_ie.c

   1 /*
   2  * wpa_supplicant - WPA/RSN IE and KDE processing
   3  * Copyright (c) 2003-2018, 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         if (wpa_ie_len >= 6 && wpa_ie[0] == WLAN_EID_VENDOR_SPECIFIC &&
  34             wpa_ie[1] >= 4 && WPA_GET_BE32(&wpa_ie[2]) == OSEN_IE_VENDOR_TYPE)
  35                 return wpa_parse_wpa_ie_rsn(wpa_ie, wpa_ie_len, data);
  36         else
  37                 return wpa_parse_wpa_ie_wpa(wpa_ie, wpa_ie_len, data);
  38 }
  39
  40
  41 static int wpa_gen_wpa_ie_wpa(u8 *wpa_ie, size_t wpa_ie_len,
  42                               int pairwise_cipher, int group_cipher,
  43                               int key_mgmt)
  44 {
  45         u8 *pos;
  46         struct wpa_ie_hdr *hdr;
  47         u32 suite;
  48
  49         if (wpa_ie_len < sizeof(*hdr) + WPA_SELECTOR_LEN +
  50             2 + WPA_SELECTOR_LEN + 2 + WPA_SELECTOR_LEN)
  51                 return -1;
  52
  53         hdr = (struct wpa_ie_hdr *) wpa_ie;
  54         hdr->elem_id = WLAN_EID_VENDOR_SPECIFIC;
  55         RSN_SELECTOR_PUT(hdr->oui, WPA_OUI_TYPE);
  56         WPA_PUT_LE16(hdr->version, WPA_VERSION);
  57         pos = (u8 *) (hdr + 1);
  58
  59         suite = wpa_cipher_to_suite(WPA_PROTO_WPA, group_cipher);
  60         if (suite == 0) {
  61                 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
  62                            group_cipher);
  63                 return -1;
  64         }
  65         RSN_SELECTOR_PUT(pos, suite);
  66         pos += WPA_SELECTOR_LEN;
  67
  68         *pos++ = 1;
  69         *pos++ = 0;
  70         suite = wpa_cipher_to_suite(WPA_PROTO_WPA, pairwise_cipher);
  71         if (suite == 0 ||
  72             (!wpa_cipher_valid_pairwise(pairwise_cipher) &&
  73              pairwise_cipher != WPA_CIPHER_NONE)) {
  74                 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
  75                            pairwise_cipher);
  76                 return -1;
  77         }
  78         RSN_SELECTOR_PUT(pos, suite);
  79         pos += WPA_SELECTOR_LEN;
  80
  81         *pos++ = 1;
  82         *pos++ = 0;
  83         if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
  84                 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_UNSPEC_802_1X);
  85         } else if (key_mgmt == WPA_KEY_MGMT_PSK) {
  86                 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X);
  87         } else if (key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
  88                 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_NONE);
  89         } else if (key_mgmt == WPA_KEY_MGMT_CCKM) {
  90                 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_CCKM);
  91         } else {
  92                 wpa_printf(MSG_WARNING, "Invalid key management type (%d).",
  93                            key_mgmt);
  94                 return -1;
  95         }
  96         pos += WPA_SELECTOR_LEN;
  97
  98         /* WPA Capabilities; use defaults, so no need to include it */
  99
 100         hdr->len = (pos - wpa_ie) - 2;
 101
 102         WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len);
 103
 104         return pos - wpa_ie;
 105 }
 106
 107
 108 static int wpa_gen_wpa_ie_rsn(u8 *rsn_ie, size_t rsn_ie_len,
 109                               int pairwise_cipher, int group_cipher,
 110                               int key_mgmt, int mgmt_group_cipher,
 111                               struct wpa_sm *sm)
 112 {
 113         u8 *pos;
 114         struct rsn_ie_hdr *hdr;
 115         u16 capab;
 116         u32 suite;
 117
 118         if (rsn_ie_len < sizeof(*hdr) + RSN_SELECTOR_LEN +
 119             2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN + 2 +
 120             (sm->cur_pmksa ? 2 + PMKID_LEN : 0)) {
 121                 wpa_printf(MSG_DEBUG, "RSN: Too short IE buffer (%lu bytes)",
 122                            (unsigned long) rsn_ie_len);
 123                 return -1;
 124         }
 125
 126         hdr = (struct rsn_ie_hdr *) rsn_ie;
 127         hdr->elem_id = WLAN_EID_RSN;
 128         WPA_PUT_LE16(hdr->version, RSN_VERSION);
 129         pos = (u8 *) (hdr + 1);
 130
 131         suite = wpa_cipher_to_suite(WPA_PROTO_RSN, group_cipher);
 132         if (suite == 0) {
 133                 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
 134                            group_cipher);
 135                 return -1;
 136         }
 137         RSN_SELECTOR_PUT(pos, suite);
 138         pos += RSN_SELECTOR_LEN;
 139
 140         *pos++ = 1;
 141         *pos++ = 0;
 142         suite = wpa_cipher_to_suite(WPA_PROTO_RSN, pairwise_cipher);
 143         if (suite == 0 ||
 144             (!wpa_cipher_valid_pairwise(pairwise_cipher) &&
 145              pairwise_cipher != WPA_CIPHER_NONE)) {
 146                 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
 147                            pairwise_cipher);
 148                 return -1;
 149         }
 150         RSN_SELECTOR_PUT(pos, suite);
 151         pos += RSN_SELECTOR_LEN;
 152
 153         *pos++ = 1;
 154         *pos++ = 0;
 155         if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
 156                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_UNSPEC_802_1X);
 157         } else if (key_mgmt == WPA_KEY_MGMT_PSK) {
 158                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X);
 159         } else if (key_mgmt == WPA_KEY_MGMT_CCKM) {
 160                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_CCKM);
 161 #ifdef CONFIG_IEEE80211R
 162         } else if (key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) {
 163                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
 164 #ifdef CONFIG_SHA384
 165         } else if (key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X_SHA384) {
 166                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X_SHA384);
 167 #endif /* CONFIG_SHA384 */
 168         } else if (key_mgmt == WPA_KEY_MGMT_FT_PSK) {
 169                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
 170 #endif /* CONFIG_IEEE80211R */
 171 #ifdef CONFIG_IEEE80211W
 172         } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SHA256) {
 173                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SHA256);
 174         } else if (key_mgmt == WPA_KEY_MGMT_PSK_SHA256) {
 175                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_SHA256);
 176 #endif /* CONFIG_IEEE80211W */
 177 #ifdef CONFIG_SAE
 178         } else if (key_mgmt == WPA_KEY_MGMT_SAE) {
 179                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_SAE);
 180         } else if (key_mgmt == WPA_KEY_MGMT_FT_SAE) {
 181                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
 182 #endif /* CONFIG_SAE */
 183         } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SUITE_B_192) {
 184                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SUITE_B_192);
 185         } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SUITE_B) {
 186                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SUITE_B);
 187 #ifdef CONFIG_FILS
 188         } else if (key_mgmt & WPA_KEY_MGMT_FILS_SHA256) {
 189                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FILS_SHA256);
 190         } else if (key_mgmt & WPA_KEY_MGMT_FILS_SHA384) {
 191                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FILS_SHA384);
 192 #ifdef CONFIG_IEEE80211R
 193         } else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA256) {
 194                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA256);
 195         } else if (key_mgmt & WPA_KEY_MGMT_FT_FILS_SHA384) {
 196                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA384);
 197 #endif /* CONFIG_IEEE80211R */
 198 #endif /* CONFIG_FILS */
 199 #ifdef CONFIG_OWE
 200         } else if (key_mgmt & WPA_KEY_MGMT_OWE) {
 201                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_OWE);
 202 #endif /* CONFIG_OWE */
 203 #ifdef CONFIG_DPP
 204         } else if (key_mgmt & WPA_KEY_MGMT_DPP) {
 205                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_DPP);
 206 #endif /* CONFIG_DPP */
 207 #ifdef CONFIG_HS20
 208         } else if (key_mgmt & WPA_KEY_MGMT_OSEN) {
 209                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_OSEN);
 210 #endif /* CONFIG_HS20 */
 211         } else {
 212                 wpa_printf(MSG_WARNING, "Invalid key management type (%d).",
 213                            key_mgmt);
 214                 return -1;
 215         }
 216         pos += RSN_SELECTOR_LEN;
 217
 218         /* RSN Capabilities */
 219         capab = 0;
 220 #ifdef CONFIG_IEEE80211W
 221         if (sm->mfp)
 222                 capab |= WPA_CAPABILITY_MFPC;
 223         if (sm->mfp == 2)
 224                 capab |= WPA_CAPABILITY_MFPR;
 225 #endif /* CONFIG_IEEE80211W */
 226         WPA_PUT_LE16(pos, capab);
 227         pos += 2;
 228
 229         if (sm->cur_pmksa) {
 230                 /* PMKID Count (2 octets, little endian) */
 231                 *pos++ = 1;
 232                 *pos++ = 0;
 233                 /* PMKID */
 234                 os_memcpy(pos, sm->cur_pmksa->pmkid, PMKID_LEN);
 235                 pos += PMKID_LEN;
 236         }
 237
 238 #ifdef CONFIG_IEEE80211W
 239         if (wpa_cipher_valid_mgmt_group(mgmt_group_cipher)) {
 240                 if (!sm->cur_pmksa) {
 241                         /* PMKID Count */
 242                         WPA_PUT_LE16(pos, 0);
 243                         pos += 2;
 244                 }
 245
 246                 /* Management Group Cipher Suite */
 247                 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
 248                                                           mgmt_group_cipher));
 249                 pos += RSN_SELECTOR_LEN;
 250         }
 251 #endif /* CONFIG_IEEE80211W */
 252
 253         hdr->len = (pos - rsn_ie) - 2;
 254
 255         WPA_ASSERT((size_t) (pos - rsn_ie) <= rsn_ie_len);
 256
 257         return pos - rsn_ie;
 258 }
 259
 260
 261 #ifdef CONFIG_HS20
 262 static int wpa_gen_wpa_ie_osen(u8 *wpa_ie, size_t wpa_ie_len,
 263                                int pairwise_cipher, int group_cipher,
 264                                int key_mgmt)
 265 {
 266         u8 *pos, *len;
 267         u32 suite;
 268
 269         if (wpa_ie_len < 2 + 4 + RSN_SELECTOR_LEN +
 270             2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN)
 271                 return -1;
 272
 273         pos = wpa_ie;
 274         *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 275         len = pos++; /* to be filled */
 276         WPA_PUT_BE24(pos, OUI_WFA);
 277         pos += 3;
 278         *pos++ = HS20_OSEN_OUI_TYPE;
 279
 280         /* Group Data Cipher Suite */
 281         suite = wpa_cipher_to_suite(WPA_PROTO_RSN, group_cipher);
 282         if (suite == 0) {
 283                 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
 284                            group_cipher);
 285                 return -1;
 286         }
 287         RSN_SELECTOR_PUT(pos, suite);
 288         pos += RSN_SELECTOR_LEN;
 289
 290         /* Pairwise Cipher Suite Count and List */
 291         WPA_PUT_LE16(pos, 1);
 292         pos += 2;
 293         suite = wpa_cipher_to_suite(WPA_PROTO_RSN, pairwise_cipher);
 294         if (suite == 0 ||
 295             (!wpa_cipher_valid_pairwise(pairwise_cipher) &&
 296              pairwise_cipher != WPA_CIPHER_NONE)) {
 297                 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
 298                            pairwise_cipher);
 299                 return -1;
 300         }
 301         RSN_SELECTOR_PUT(pos, suite);
 302         pos += RSN_SELECTOR_LEN;
 303
 304         /* AKM Suite Count and List */
 305         WPA_PUT_LE16(pos, 1);
 306         pos += 2;
 307         RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_OSEN);
 308         pos += RSN_SELECTOR_LEN;
 309
 310         *len = pos - len - 1;
 311
 312         WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len);
 313
 314         return pos - wpa_ie;
 315 }
 316 #endif /* CONFIG_HS20 */
 317
 318
 319 /**
 320  * wpa_gen_wpa_ie - Generate WPA/RSN IE based on current security policy
 321  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 322  * @wpa_ie: Pointer to memory area for the generated WPA/RSN IE
 323  * @wpa_ie_len: Maximum length of the generated WPA/RSN IE
 324  * Returns: Length of the generated WPA/RSN IE or -1 on failure
 325  */
 326 int wpa_gen_wpa_ie(struct wpa_sm *sm, u8 *wpa_ie, size_t wpa_ie_len)
 327 {
 328         if (sm->proto == WPA_PROTO_RSN)
 329                 return wpa_gen_wpa_ie_rsn(wpa_ie, wpa_ie_len,
 330                                           sm->pairwise_cipher,
 331                                           sm->group_cipher,
 332                                           sm->key_mgmt, sm->mgmt_group_cipher,
 333                                           sm);
 334 #ifdef CONFIG_HS20
 335         else if (sm->proto == WPA_PROTO_OSEN)
 336                 return wpa_gen_wpa_ie_osen(wpa_ie, wpa_ie_len,
 337                                            sm->pairwise_cipher,
 338                                            sm->group_cipher,
 339                                            sm->key_mgmt);
 340 #endif /* CONFIG_HS20 */
 341         else
 342                 return wpa_gen_wpa_ie_wpa(wpa_ie, wpa_ie_len,
 343                                           sm->pairwise_cipher,
 344                                           sm->group_cipher,
 345                                           sm->key_mgmt);
 346 }
 347
 348
 349 /**
 350  * wpa_parse_vendor_specific - Parse Vendor Specific IEs
 351  * @pos: Pointer to the IE header
 352  * @end: Pointer to the end of the Key Data buffer
 353  * @ie: Pointer to parsed IE data
 354  * Returns: 0 on success, 1 if end mark is found, -1 on failure
 355  */
 356 static int wpa_parse_vendor_specific(const u8 *pos, const u8 *end,
 357                                      struct wpa_eapol_ie_parse *ie)
 358 {
 359         unsigned int oui;
 360
 361         if (pos[1] < 4) {
 362                 wpa_printf(MSG_MSGDUMP, "Too short vendor specific IE ignored (len=%u)",
 363                            pos[1]);
 364                 return 1;
 365         }
 366
 367         oui = WPA_GET_BE24(&pos[2]);
 368         if (oui == OUI_MICROSOFT && pos[5] == WMM_OUI_TYPE && pos[1] > 4) {
 369                 if (pos[6] == WMM_OUI_SUBTYPE_INFORMATION_ELEMENT) {
 370                         ie->wmm = &pos[2];
 371                         ie->wmm_len = pos[1];
 372                         wpa_hexdump(MSG_DEBUG, "WPA: WMM IE",
 373                                     ie->wmm, ie->wmm_len);
 374                 } else if (pos[6] == WMM_OUI_SUBTYPE_PARAMETER_ELEMENT) {
 375                         ie->wmm = &pos[2];
 376                         ie->wmm_len = pos[1];
 377                         wpa_hexdump(MSG_DEBUG, "WPA: WMM Parameter Element",
 378                                     ie->wmm, ie->wmm_len);
 379                 }
 380         }
 381         return 0;
 382 }
 383
 384
 385 /**
 386  * wpa_parse_generic - Parse EAPOL-Key Key Data Generic IEs
 387  * @pos: Pointer to the IE header
 388  * @end: Pointer to the end of the Key Data buffer
 389  * @ie: Pointer to parsed IE data
 390  * Returns: 0 on success, 1 if end mark is found, -1 on failure
 391  */
 392 static int wpa_parse_generic(const u8 *pos, const u8 *end,
 393                              struct wpa_eapol_ie_parse *ie)
 394 {
 395         if (pos[1] == 0)
 396                 return 1;
 397
 398         if (pos[1] >= 6 &&
 399             RSN_SELECTOR_GET(pos + 2) == WPA_OUI_TYPE &&
 400             pos[2 + WPA_SELECTOR_LEN] == 1 &&
 401             pos[2 + WPA_SELECTOR_LEN + 1] == 0) {
 402                 ie->wpa_ie = pos;
 403                 ie->wpa_ie_len = pos[1] + 2;
 404                 wpa_hexdump(MSG_DEBUG, "WPA: WPA IE in EAPOL-Key",
 405                             ie->wpa_ie, ie->wpa_ie_len);
 406                 return 0;
 407         }
 408
 409         if (1 + RSN_SELECTOR_LEN < end - pos &&
 410             pos[1] >= RSN_SELECTOR_LEN + PMKID_LEN &&
 411             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_PMKID) {
 412                 ie->pmkid = pos + 2 + RSN_SELECTOR_LEN;
 413                 wpa_hexdump(MSG_DEBUG, "WPA: PMKID in EAPOL-Key",
 414                             pos, pos[1] + 2);
 415                 return 0;
 416         }
 417
 418         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 419             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_GROUPKEY) {
 420                 ie->gtk = pos + 2 + RSN_SELECTOR_LEN;
 421                 ie->gtk_len = pos[1] - RSN_SELECTOR_LEN;
 422                 wpa_hexdump_key(MSG_DEBUG, "WPA: GTK in EAPOL-Key",
 423                                 pos, pos[1] + 2);
 424                 return 0;
 425         }
 426
 427         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 428             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_MAC_ADDR) {
 429                 ie->mac_addr = pos + 2 + RSN_SELECTOR_LEN;
 430                 ie->mac_addr_len = pos[1] - RSN_SELECTOR_LEN;
 431                 wpa_hexdump(MSG_DEBUG, "WPA: MAC Address in EAPOL-Key",
 432                             pos, pos[1] + 2);
 433                 return 0;
 434         }
 435
 436 #ifdef CONFIG_IEEE80211W
 437         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 438             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_IGTK) {
 439                 ie->igtk = pos + 2 + RSN_SELECTOR_LEN;
 440                 ie->igtk_len = pos[1] - RSN_SELECTOR_LEN;
 441                 wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK in EAPOL-Key",
 442                                 pos, pos[1] + 2);
 443                 return 0;
 444         }
 445 #endif /* CONFIG_IEEE80211W */
 446
 447 #ifdef CONFIG_P2P
 448         if (pos[1] >= RSN_SELECTOR_LEN + 1 &&
 449             RSN_SELECTOR_GET(pos + 2) == WFA_KEY_DATA_IP_ADDR_REQ) {
 450                 ie->ip_addr_req = pos + 2 + RSN_SELECTOR_LEN;
 451                 wpa_hexdump(MSG_DEBUG, "WPA: IP Address Request in EAPOL-Key",
 452                             ie->ip_addr_req, pos[1] - RSN_SELECTOR_LEN);
 453                 return 0;
 454         }
 455
 456         if (pos[1] >= RSN_SELECTOR_LEN + 3 * 4 &&
 457             RSN_SELECTOR_GET(pos + 2) == WFA_KEY_DATA_IP_ADDR_ALLOC) {
 458                 ie->ip_addr_alloc = pos + 2 + RSN_SELECTOR_LEN;
 459                 wpa_hexdump(MSG_DEBUG,
 460                             "WPA: IP Address Allocation in EAPOL-Key",
 461                             ie->ip_addr_alloc, pos[1] - RSN_SELECTOR_LEN);
 462                 return 0;
 463         }
 464 #endif /* CONFIG_P2P */
 465
 466         return 0;
 467 }
 468
 469
 470 /**
 471  * wpa_supplicant_parse_ies - Parse EAPOL-Key Key Data IEs
 472  * @buf: Pointer to the Key Data buffer
 473  * @len: Key Data Length
 474  * @ie: Pointer to parsed IE data
 475  * Returns: 0 on success, -1 on failure
 476  */
 477 int wpa_supplicant_parse_ies(const u8 *buf, size_t len,
 478                              struct wpa_eapol_ie_parse *ie)
 479 {
 480         const u8 *pos, *end;
 481         int ret = 0;
 482
 483         os_memset(ie, 0, sizeof(*ie));
 484         for (pos = buf, end = pos + len; end - pos > 1; pos += 2 + pos[1]) {
 485                 if (pos[0] == 0xdd &&
 486                     ((pos == buf + len - 1) || pos[1] == 0)) {
 487                         /* Ignore padding */
 488                         break;
 489                 }
 490                 if (2 + pos[1] > end - pos) {
 491                         wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key Key Data "
 492                                    "underflow (ie=%d len=%d pos=%d)",
 493                                    pos[0], pos[1], (int) (pos - buf));
 494                         wpa_hexdump_key(MSG_DEBUG, "WPA: Key Data",
 495                                         buf, len);
 496                         ret = -1;
 497                         break;
 498                 }
 499                 if (*pos == WLAN_EID_RSN) {
 500                         ie->rsn_ie = pos;
 501                         ie->rsn_ie_len = pos[1] + 2;
 502                         wpa_hexdump(MSG_DEBUG, "WPA: RSN IE in EAPOL-Key",
 503                                     ie->rsn_ie, ie->rsn_ie_len);
 504                 } else if (*pos == WLAN_EID_MOBILITY_DOMAIN &&
 505                            pos[1] >= sizeof(struct rsn_mdie)) {
 506                         ie->mdie = pos;
 507                         ie->mdie_len = pos[1] + 2;
 508                         wpa_hexdump(MSG_DEBUG, "WPA: MDIE in EAPOL-Key",
 509                                     ie->mdie, ie->mdie_len);
 510                 } else if (*pos == WLAN_EID_FAST_BSS_TRANSITION &&
 511                            pos[1] >= sizeof(struct rsn_ftie)) {
 512                         ie->ftie = pos;
 513                         ie->ftie_len = pos[1] + 2;
 514                         wpa_hexdump(MSG_DEBUG, "WPA: FTIE in EAPOL-Key",
 515                                     ie->ftie, ie->ftie_len);
 516                 } else if (*pos == WLAN_EID_TIMEOUT_INTERVAL && pos[1] >= 5) {
 517                         if (pos[2] == WLAN_TIMEOUT_REASSOC_DEADLINE) {
 518                                 ie->reassoc_deadline = pos;
 519                                 wpa_hexdump(MSG_DEBUG, "WPA: Reassoc Deadline "
 520                                             "in EAPOL-Key",
 521                                             ie->reassoc_deadline, pos[1] + 2);
 522                         } else if (pos[2] == WLAN_TIMEOUT_KEY_LIFETIME) {
 523                                 ie->key_lifetime = pos;
 524                                 wpa_hexdump(MSG_DEBUG, "WPA: KeyLifetime "
 525                                             "in EAPOL-Key",
 526                                             ie->key_lifetime, pos[1] + 2);
 527                         } else {
 528                                 wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized "
 529                                             "EAPOL-Key Key Data IE",
 530                                             pos, 2 + pos[1]);
 531                         }
 532                 } else if (*pos == WLAN_EID_LINK_ID) {
 533                         if (pos[1] >= 18) {
 534                                 ie->lnkid = pos;
 535                                 ie->lnkid_len = pos[1] + 2;
 536                         }
 537                 } else if (*pos == WLAN_EID_EXT_CAPAB) {
 538                         ie->ext_capab = pos;
 539                         ie->ext_capab_len = pos[1] + 2;
 540                 } else if (*pos == WLAN_EID_SUPP_RATES) {
 541                         ie->supp_rates = pos;
 542                         ie->supp_rates_len = pos[1] + 2;
 543                 } else if (*pos == WLAN_EID_EXT_SUPP_RATES) {
 544                         ie->ext_supp_rates = pos;
 545                         ie->ext_supp_rates_len = pos[1] + 2;
 546                 } else if (*pos == WLAN_EID_HT_CAP &&
 547                            pos[1] >= sizeof(struct ieee80211_ht_capabilities)) {
 548                         ie->ht_capabilities = pos + 2;
 549                 } else if (*pos == WLAN_EID_VHT_AID) {
 550                         if (pos[1] >= 2)
 551                                 ie->aid = WPA_GET_LE16(pos + 2) & 0x3fff;
 552                 } else if (*pos == WLAN_EID_VHT_CAP &&
 553                            pos[1] >= sizeof(struct ieee80211_vht_capabilities))
 554                 {
 555                         ie->vht_capabilities = pos + 2;
 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 }