libeap/src/rsn_supp/wpa_ie.c

   1 /*
   2  * wpa_supplicant - WPA/RSN IE and KDE processing
   3  * Copyright (c) 2003-2015, 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         } else if (key_mgmt == WPA_KEY_MGMT_FT_PSK) {
 165                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
 166 #endif /* CONFIG_IEEE80211R */
 167 #ifdef CONFIG_IEEE80211W
 168         } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SHA256) {
 169                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SHA256);
 170         } else if (key_mgmt == WPA_KEY_MGMT_PSK_SHA256) {
 171                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_SHA256);
 172 #endif /* CONFIG_IEEE80211W */
 173 #ifdef CONFIG_SAE
 174         } else if (key_mgmt == WPA_KEY_MGMT_SAE) {
 175                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_SAE);
 176         } else if (key_mgmt == WPA_KEY_MGMT_FT_SAE) {
 177                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
 178 #endif /* CONFIG_SAE */
 179         } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SUITE_B_192) {
 180                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SUITE_B_192);
 181         } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SUITE_B) {
 182                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SUITE_B);
 183         } else {
 184                 wpa_printf(MSG_WARNING, "Invalid key management type (%d).",
 185                            key_mgmt);
 186                 return -1;
 187         }
 188         pos += RSN_SELECTOR_LEN;
 189
 190         /* RSN Capabilities */
 191         capab = 0;
 192 #ifdef CONFIG_IEEE80211W
 193         if (sm->mfp)
 194                 capab |= WPA_CAPABILITY_MFPC;
 195         if (sm->mfp == 2)
 196                 capab |= WPA_CAPABILITY_MFPR;
 197 #endif /* CONFIG_IEEE80211W */
 198         WPA_PUT_LE16(pos, capab);
 199         pos += 2;
 200
 201         if (sm->cur_pmksa) {
 202                 /* PMKID Count (2 octets, little endian) */
 203                 *pos++ = 1;
 204                 *pos++ = 0;
 205                 /* PMKID */
 206                 os_memcpy(pos, sm->cur_pmksa->pmkid, PMKID_LEN);
 207                 pos += PMKID_LEN;
 208         }
 209
 210 #ifdef CONFIG_IEEE80211W
 211         if (wpa_cipher_valid_mgmt_group(mgmt_group_cipher)) {
 212                 if (!sm->cur_pmksa) {
 213                         /* PMKID Count */
 214                         WPA_PUT_LE16(pos, 0);
 215                         pos += 2;
 216                 }
 217
 218                 /* Management Group Cipher Suite */
 219                 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
 220                                                           mgmt_group_cipher));
 221                 pos += RSN_SELECTOR_LEN;
 222         }
 223 #endif /* CONFIG_IEEE80211W */
 224
 225         hdr->len = (pos - rsn_ie) - 2;
 226
 227         WPA_ASSERT((size_t) (pos - rsn_ie) <= rsn_ie_len);
 228
 229         return pos - rsn_ie;
 230 }
 231
 232
 233 #ifdef CONFIG_HS20
 234 static int wpa_gen_wpa_ie_osen(u8 *wpa_ie, size_t wpa_ie_len,
 235                                int pairwise_cipher, int group_cipher,
 236                                int key_mgmt)
 237 {
 238         u8 *pos, *len;
 239         u32 suite;
 240
 241         if (wpa_ie_len < 2 + 4 + RSN_SELECTOR_LEN +
 242             2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN)
 243                 return -1;
 244
 245         pos = wpa_ie;
 246         *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 247         len = pos++; /* to be filled */
 248         WPA_PUT_BE24(pos, OUI_WFA);
 249         pos += 3;
 250         *pos++ = HS20_OSEN_OUI_TYPE;
 251
 252         /* Group Data Cipher Suite */
 253         suite = wpa_cipher_to_suite(WPA_PROTO_RSN, group_cipher);
 254         if (suite == 0) {
 255                 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
 256                            group_cipher);
 257                 return -1;
 258         }
 259         RSN_SELECTOR_PUT(pos, suite);
 260         pos += RSN_SELECTOR_LEN;
 261
 262         /* Pairwise Cipher Suite Count and List */
 263         WPA_PUT_LE16(pos, 1);
 264         pos += 2;
 265         suite = wpa_cipher_to_suite(WPA_PROTO_RSN, pairwise_cipher);
 266         if (suite == 0 ||
 267             (!wpa_cipher_valid_pairwise(pairwise_cipher) &&
 268              pairwise_cipher != WPA_CIPHER_NONE)) {
 269                 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
 270                            pairwise_cipher);
 271                 return -1;
 272         }
 273         RSN_SELECTOR_PUT(pos, suite);
 274         pos += RSN_SELECTOR_LEN;
 275
 276         /* AKM Suite Count and List */
 277         WPA_PUT_LE16(pos, 1);
 278         pos += 2;
 279         RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_OSEN);
 280         pos += RSN_SELECTOR_LEN;
 281
 282         *len = pos - len - 1;
 283
 284         WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len);
 285
 286         return pos - wpa_ie;
 287 }
 288 #endif /* CONFIG_HS20 */
 289
 290
 291 /**
 292  * wpa_gen_wpa_ie - Generate WPA/RSN IE based on current security policy
 293  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 294  * @wpa_ie: Pointer to memory area for the generated WPA/RSN IE
 295  * @wpa_ie_len: Maximum length of the generated WPA/RSN IE
 296  * Returns: Length of the generated WPA/RSN IE or -1 on failure
 297  */
 298 int wpa_gen_wpa_ie(struct wpa_sm *sm, u8 *wpa_ie, size_t wpa_ie_len)
 299 {
 300         if (sm->proto == WPA_PROTO_RSN)
 301                 return wpa_gen_wpa_ie_rsn(wpa_ie, wpa_ie_len,
 302                                           sm->pairwise_cipher,
 303                                           sm->group_cipher,
 304                                           sm->key_mgmt, sm->mgmt_group_cipher,
 305                                           sm);
 306 #ifdef CONFIG_HS20
 307         else if (sm->proto == WPA_PROTO_OSEN)
 308                 return wpa_gen_wpa_ie_osen(wpa_ie, wpa_ie_len,
 309                                            sm->pairwise_cipher,
 310                                            sm->group_cipher,
 311                                            sm->key_mgmt);
 312 #endif /* CONFIG_HS20 */
 313         else
 314                 return wpa_gen_wpa_ie_wpa(wpa_ie, wpa_ie_len,
 315                                           sm->pairwise_cipher,
 316                                           sm->group_cipher,
 317                                           sm->key_mgmt);
 318 }
 319
 320
 321 /**
 322  * wpa_parse_vendor_specific - Parse Vendor Specific IEs
 323  * @pos: Pointer to the IE header
 324  * @end: Pointer to the end of the Key Data buffer
 325  * @ie: Pointer to parsed IE data
 326  * Returns: 0 on success, 1 if end mark is found, -1 on failure
 327  */
 328 static int wpa_parse_vendor_specific(const u8 *pos, const u8 *end,
 329                                      struct wpa_eapol_ie_parse *ie)
 330 {
 331         unsigned int oui;
 332
 333         if (pos[1] < 4) {
 334                 wpa_printf(MSG_MSGDUMP, "Too short vendor specific IE ignored (len=%u)",
 335                            pos[1]);
 336                 return 1;
 337         }
 338
 339         oui = WPA_GET_BE24(&pos[2]);
 340         if (oui == OUI_MICROSOFT && pos[5] == WMM_OUI_TYPE && pos[1] > 4) {
 341                 if (pos[6] == WMM_OUI_SUBTYPE_INFORMATION_ELEMENT) {
 342                         ie->wmm = &pos[2];
 343                         ie->wmm_len = pos[1];
 344                         wpa_hexdump(MSG_DEBUG, "WPA: WMM IE",
 345                                     ie->wmm, ie->wmm_len);
 346                 } else if (pos[6] == WMM_OUI_SUBTYPE_PARAMETER_ELEMENT) {
 347                         ie->wmm = &pos[2];
 348                         ie->wmm_len = pos[1];
 349                         wpa_hexdump(MSG_DEBUG, "WPA: WMM Parameter Element",
 350                                     ie->wmm, ie->wmm_len);
 351                 }
 352         }
 353         return 0;
 354 }
 355
 356
 357 /**
 358  * wpa_parse_generic - Parse EAPOL-Key Key Data Generic IEs
 359  * @pos: Pointer to the IE header
 360  * @end: Pointer to the end of the Key Data buffer
 361  * @ie: Pointer to parsed IE data
 362  * Returns: 0 on success, 1 if end mark is found, -1 on failure
 363  */
 364 static int wpa_parse_generic(const u8 *pos, const u8 *end,
 365                              struct wpa_eapol_ie_parse *ie)
 366 {
 367         if (pos[1] == 0)
 368                 return 1;
 369
 370         if (pos[1] >= 6 &&
 371             RSN_SELECTOR_GET(pos + 2) == WPA_OUI_TYPE &&
 372             pos[2 + WPA_SELECTOR_LEN] == 1 &&
 373             pos[2 + WPA_SELECTOR_LEN + 1] == 0) {
 374                 ie->wpa_ie = pos;
 375                 ie->wpa_ie_len = pos[1] + 2;
 376                 wpa_hexdump(MSG_DEBUG, "WPA: WPA IE in EAPOL-Key",
 377                             ie->wpa_ie, ie->wpa_ie_len);
 378                 return 0;
 379         }
 380
 381         if (pos + 1 + RSN_SELECTOR_LEN < end &&
 382             pos[1] >= RSN_SELECTOR_LEN + PMKID_LEN &&
 383             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_PMKID) {
 384                 ie->pmkid = pos + 2 + RSN_SELECTOR_LEN;
 385                 wpa_hexdump(MSG_DEBUG, "WPA: PMKID in EAPOL-Key",
 386                             pos, pos[1] + 2);
 387                 return 0;
 388         }
 389
 390         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 391             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_GROUPKEY) {
 392                 ie->gtk = pos + 2 + RSN_SELECTOR_LEN;
 393                 ie->gtk_len = pos[1] - RSN_SELECTOR_LEN;
 394                 wpa_hexdump_key(MSG_DEBUG, "WPA: GTK in EAPOL-Key",
 395                                 pos, pos[1] + 2);
 396                 return 0;
 397         }
 398
 399         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 400             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_MAC_ADDR) {
 401                 ie->mac_addr = pos + 2 + RSN_SELECTOR_LEN;
 402                 ie->mac_addr_len = pos[1] - RSN_SELECTOR_LEN;
 403                 wpa_hexdump(MSG_DEBUG, "WPA: MAC Address in EAPOL-Key",
 404                             pos, pos[1] + 2);
 405                 return 0;
 406         }
 407
 408 #ifdef CONFIG_PEERKEY
 409         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 410             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_SMK) {
 411                 ie->smk = pos + 2 + RSN_SELECTOR_LEN;
 412                 ie->smk_len = pos[1] - RSN_SELECTOR_LEN;
 413                 wpa_hexdump_key(MSG_DEBUG, "WPA: SMK 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_NONCE) {
 420                 ie->nonce = pos + 2 + RSN_SELECTOR_LEN;
 421                 ie->nonce_len = pos[1] - RSN_SELECTOR_LEN;
 422                 wpa_hexdump(MSG_DEBUG, "WPA: Nonce 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_LIFETIME) {
 429                 ie->lifetime = pos + 2 + RSN_SELECTOR_LEN;
 430                 ie->lifetime_len = pos[1] - RSN_SELECTOR_LEN;
 431                 wpa_hexdump(MSG_DEBUG, "WPA: Lifetime in EAPOL-Key",
 432                             pos, pos[1] + 2);
 433                 return 0;
 434         }
 435
 436         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 437             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_ERROR) {
 438                 ie->error = pos + 2 + RSN_SELECTOR_LEN;
 439                 ie->error_len = pos[1] - RSN_SELECTOR_LEN;
 440                 wpa_hexdump(MSG_DEBUG, "WPA: Error in EAPOL-Key",
 441                             pos, pos[1] + 2);
 442                 return 0;
 443         }
 444 #endif /* CONFIG_PEERKEY */
 445
 446 #ifdef CONFIG_IEEE80211W
 447         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 448             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_IGTK) {
 449                 ie->igtk = pos + 2 + RSN_SELECTOR_LEN;
 450                 ie->igtk_len = pos[1] - RSN_SELECTOR_LEN;
 451                 wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK in EAPOL-Key",
 452                                 pos, pos[1] + 2);
 453                 return 0;
 454         }
 455 #endif /* CONFIG_IEEE80211W */
 456
 457 #ifdef CONFIG_P2P
 458         if (pos[1] >= RSN_SELECTOR_LEN + 1 &&
 459             RSN_SELECTOR_GET(pos + 2) == WFA_KEY_DATA_IP_ADDR_REQ) {
 460                 ie->ip_addr_req = pos + 2 + RSN_SELECTOR_LEN;
 461                 wpa_hexdump(MSG_DEBUG, "WPA: IP Address Request in EAPOL-Key",
 462                             ie->ip_addr_req, pos[1] - RSN_SELECTOR_LEN);
 463                 return 0;
 464         }
 465
 466         if (pos[1] >= RSN_SELECTOR_LEN + 3 * 4 &&
 467             RSN_SELECTOR_GET(pos + 2) == WFA_KEY_DATA_IP_ADDR_ALLOC) {
 468                 ie->ip_addr_alloc = pos + 2 + RSN_SELECTOR_LEN;
 469                 wpa_hexdump(MSG_DEBUG,
 470                             "WPA: IP Address Allocation in EAPOL-Key",
 471                             ie->ip_addr_alloc, pos[1] - RSN_SELECTOR_LEN);
 472                 return 0;
 473         }
 474 #endif /* CONFIG_P2P */
 475
 476         return 0;
 477 }
 478
 479
 480 /**
 481  * wpa_supplicant_parse_ies - Parse EAPOL-Key Key Data IEs
 482  * @buf: Pointer to the Key Data buffer
 483  * @len: Key Data Length
 484  * @ie: Pointer to parsed IE data
 485  * Returns: 0 on success, -1 on failure
 486  */
 487 int wpa_supplicant_parse_ies(const u8 *buf, size_t len,
 488                              struct wpa_eapol_ie_parse *ie)
 489 {
 490         const u8 *pos, *end;
 491         int ret = 0;
 492
 493         os_memset(ie, 0, sizeof(*ie));
 494         for (pos = buf, end = pos + len; pos + 1 < end; pos += 2 + pos[1]) {
 495                 if (pos[0] == 0xdd &&
 496                     ((pos == buf + len - 1) || pos[1] == 0)) {
 497                         /* Ignore padding */
 498                         break;
 499                 }
 500                 if (pos + 2 + pos[1] > end) {
 501                         wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key Key Data "
 502                                    "underflow (ie=%d len=%d pos=%d)",
 503                                    pos[0], pos[1], (int) (pos - buf));
 504                         wpa_hexdump_key(MSG_DEBUG, "WPA: Key Data",
 505                                         buf, len);
 506                         ret = -1;
 507                         break;
 508                 }
 509                 if (*pos == WLAN_EID_RSN) {
 510                         ie->rsn_ie = pos;
 511                         ie->rsn_ie_len = pos[1] + 2;
 512                         wpa_hexdump(MSG_DEBUG, "WPA: RSN IE in EAPOL-Key",
 513                                     ie->rsn_ie, ie->rsn_ie_len);
 514                 } else if (*pos == WLAN_EID_MOBILITY_DOMAIN &&
 515                            pos[1] >= sizeof(struct rsn_mdie)) {
 516                         ie->mdie = pos;
 517                         ie->mdie_len = pos[1] + 2;
 518                         wpa_hexdump(MSG_DEBUG, "WPA: MDIE in EAPOL-Key",
 519                                     ie->mdie, ie->mdie_len);
 520                 } else if (*pos == WLAN_EID_FAST_BSS_TRANSITION &&
 521                            pos[1] >= sizeof(struct rsn_ftie)) {
 522                         ie->ftie = pos;
 523                         ie->ftie_len = pos[1] + 2;
 524                         wpa_hexdump(MSG_DEBUG, "WPA: FTIE in EAPOL-Key",
 525                                     ie->ftie, ie->ftie_len);
 526                 } else if (*pos == WLAN_EID_TIMEOUT_INTERVAL && pos[1] >= 5) {
 527                         if (pos[2] == WLAN_TIMEOUT_REASSOC_DEADLINE) {
 528                                 ie->reassoc_deadline = pos;
 529                                 wpa_hexdump(MSG_DEBUG, "WPA: Reassoc Deadline "
 530                                             "in EAPOL-Key",
 531                                             ie->reassoc_deadline, pos[1] + 2);
 532                         } else if (pos[2] == WLAN_TIMEOUT_KEY_LIFETIME) {
 533                                 ie->key_lifetime = pos;
 534                                 wpa_hexdump(MSG_DEBUG, "WPA: KeyLifetime "
 535                                             "in EAPOL-Key",
 536                                             ie->key_lifetime, pos[1] + 2);
 537                         } else {
 538                                 wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized "
 539                                             "EAPOL-Key Key Data IE",
 540                                             pos, 2 + pos[1]);
 541                         }
 542                 } else if (*pos == WLAN_EID_LINK_ID) {
 543                         if (pos[1] >= 18) {
 544                                 ie->lnkid = pos;
 545                                 ie->lnkid_len = pos[1] + 2;
 546                         }
 547                 } else if (*pos == WLAN_EID_EXT_CAPAB) {
 548                         ie->ext_capab = pos;
 549                         ie->ext_capab_len = pos[1] + 2;
 550                 } else if (*pos == WLAN_EID_SUPP_RATES) {
 551                         ie->supp_rates = pos;
 552                         ie->supp_rates_len = pos[1] + 2;
 553                 } else if (*pos == WLAN_EID_EXT_SUPP_RATES) {
 554                         ie->ext_supp_rates = pos;
 555                         ie->ext_supp_rates_len = pos[1] + 2;
 556                 } else if (*pos == WLAN_EID_HT_CAP &&
 557                            pos[1] >= sizeof(struct ieee80211_ht_capabilities)) {
 558                         ie->ht_capabilities = pos + 2;
 559                 } else if (*pos == WLAN_EID_VHT_AID) {
 560                         if (pos[1] >= 2)
 561                                 ie->aid = WPA_GET_LE16(pos + 2) & 0x3fff;
 562                 } else if (*pos == WLAN_EID_VHT_CAP &&
 563                            pos[1] >= sizeof(struct ieee80211_vht_capabilities))
 564                 {
 565                         ie->vht_capabilities = pos + 2;
 566                 } else if (*pos == WLAN_EID_QOS && pos[1] >= 1) {
 567                         ie->qosinfo = pos[2];
 568                 } else if (*pos == WLAN_EID_SUPPORTED_CHANNELS) {
 569                         ie->supp_channels = pos + 2;
 570                         ie->supp_channels_len = pos[1];
 571                 } else if (*pos == WLAN_EID_SUPPORTED_OPERATING_CLASSES) {
 572                         /*
 573                          * The value of the Length field of the Supported
 574                          * Operating Classes element is between 2 and 253.
 575                          * Silently skip invalid elements to avoid interop
 576                          * issues when trying to use the value.
 577                          */
 578                         if (pos[1] >= 2 && pos[1] <= 253) {
 579                                 ie->supp_oper_classes = pos + 2;
 580                                 ie->supp_oper_classes_len = pos[1];
 581                         }
 582                 } else if (*pos == WLAN_EID_VENDOR_SPECIFIC) {
 583                         ret = wpa_parse_generic(pos, end, ie);
 584                         if (ret < 0)
 585                                 break;
 586                         if (ret > 0) {
 587                                 ret = 0;
 588                                 break;
 589                         }
 590
 591                         ret = wpa_parse_vendor_specific(pos, end, ie);
 592                         if (ret < 0)
 593                                 break;
 594                         if (ret > 0) {
 595                                 ret = 0;
 596                                 break;
 597                         }
 598                 } else {
 599                         wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized EAPOL-Key "
 600                                     "Key Data IE", pos, 2 + pos[1]);
 601                 }
 602         }
 603
 604         return ret;
 605 }