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         if (sm->ocv)
 227                 capab |= WPA_CAPABILITY_OCVC;
 228         WPA_PUT_LE16(pos, capab);
 229         pos += 2;
 230
 231         if (sm->cur_pmksa) {
 232                 /* PMKID Count (2 octets, little endian) */
 233                 *pos++ = 1;
 234                 *pos++ = 0;
 235                 /* PMKID */
 236                 os_memcpy(pos, sm->cur_pmksa->pmkid, PMKID_LEN);
 237                 pos += PMKID_LEN;
 238         }
 239
 240 #ifdef CONFIG_IEEE80211W
 241         if (wpa_cipher_valid_mgmt_group(mgmt_group_cipher)) {
 242                 if (!sm->cur_pmksa) {
 243                         /* PMKID Count */
 244                         WPA_PUT_LE16(pos, 0);
 245                         pos += 2;
 246                 }
 247
 248                 /* Management Group Cipher Suite */
 249                 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
 250                                                           mgmt_group_cipher));
 251                 pos += RSN_SELECTOR_LEN;
 252         }
 253 #endif /* CONFIG_IEEE80211W */
 254
 255         hdr->len = (pos - rsn_ie) - 2;
 256
 257         WPA_ASSERT((size_t) (pos - rsn_ie) <= rsn_ie_len);
 258
 259         return pos - rsn_ie;
 260 }
 261
 262
 263 #ifdef CONFIG_HS20
 264 static int wpa_gen_wpa_ie_osen(u8 *wpa_ie, size_t wpa_ie_len,
 265                                int pairwise_cipher, int group_cipher,
 266                                int key_mgmt)
 267 {
 268         u8 *pos, *len;
 269         u32 suite;
 270
 271         if (wpa_ie_len < 2 + 4 + RSN_SELECTOR_LEN +
 272             2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN)
 273                 return -1;
 274
 275         pos = wpa_ie;
 276         *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 277         len = pos++; /* to be filled */
 278         WPA_PUT_BE24(pos, OUI_WFA);
 279         pos += 3;
 280         *pos++ = HS20_OSEN_OUI_TYPE;
 281
 282         /* Group Data Cipher Suite */
 283         suite = wpa_cipher_to_suite(WPA_PROTO_RSN, group_cipher);
 284         if (suite == 0) {
 285                 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
 286                            group_cipher);
 287                 return -1;
 288         }
 289         RSN_SELECTOR_PUT(pos, suite);
 290         pos += RSN_SELECTOR_LEN;
 291
 292         /* Pairwise Cipher Suite Count and List */
 293         WPA_PUT_LE16(pos, 1);
 294         pos += 2;
 295         suite = wpa_cipher_to_suite(WPA_PROTO_RSN, pairwise_cipher);
 296         if (suite == 0 ||
 297             (!wpa_cipher_valid_pairwise(pairwise_cipher) &&
 298              pairwise_cipher != WPA_CIPHER_NONE)) {
 299                 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
 300                            pairwise_cipher);
 301                 return -1;
 302         }
 303         RSN_SELECTOR_PUT(pos, suite);
 304         pos += RSN_SELECTOR_LEN;
 305
 306         /* AKM Suite Count and List */
 307         WPA_PUT_LE16(pos, 1);
 308         pos += 2;
 309         RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_OSEN);
 310         pos += RSN_SELECTOR_LEN;
 311
 312         *len = pos - len - 1;
 313
 314         WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len);
 315
 316         return pos - wpa_ie;
 317 }
 318 #endif /* CONFIG_HS20 */
 319
 320
 321 /**
 322  * wpa_gen_wpa_ie - Generate WPA/RSN IE based on current security policy
 323  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 324  * @wpa_ie: Pointer to memory area for the generated WPA/RSN IE
 325  * @wpa_ie_len: Maximum length of the generated WPA/RSN IE
 326  * Returns: Length of the generated WPA/RSN IE or -1 on failure
 327  */
 328 int wpa_gen_wpa_ie(struct wpa_sm *sm, u8 *wpa_ie, size_t wpa_ie_len)
 329 {
 330         if (sm->proto == WPA_PROTO_RSN)
 331                 return wpa_gen_wpa_ie_rsn(wpa_ie, wpa_ie_len,
 332                                           sm->pairwise_cipher,
 333                                           sm->group_cipher,
 334                                           sm->key_mgmt, sm->mgmt_group_cipher,
 335                                           sm);
 336 #ifdef CONFIG_HS20
 337         else if (sm->proto == WPA_PROTO_OSEN)
 338                 return wpa_gen_wpa_ie_osen(wpa_ie, wpa_ie_len,
 339                                            sm->pairwise_cipher,
 340                                            sm->group_cipher,
 341                                            sm->key_mgmt);
 342 #endif /* CONFIG_HS20 */
 343         else
 344                 return wpa_gen_wpa_ie_wpa(wpa_ie, wpa_ie_len,
 345                                           sm->pairwise_cipher,
 346                                           sm->group_cipher,
 347                                           sm->key_mgmt);
 348 }
 349
 350
 351 /**
 352  * wpa_parse_vendor_specific - Parse Vendor Specific IEs
 353  * @pos: Pointer to the IE header
 354  * @end: Pointer to the end of the Key Data buffer
 355  * @ie: Pointer to parsed IE data
 356  * Returns: 0 on success, 1 if end mark is found, -1 on failure
 357  */
 358 static int wpa_parse_vendor_specific(const u8 *pos, const u8 *end,
 359                                      struct wpa_eapol_ie_parse *ie)
 360 {
 361         unsigned int oui;
 362
 363         if (pos[1] < 4) {
 364                 wpa_printf(MSG_MSGDUMP, "Too short vendor specific IE ignored (len=%u)",
 365                            pos[1]);
 366                 return 1;
 367         }
 368
 369         oui = WPA_GET_BE24(&pos[2]);
 370         if (oui == OUI_MICROSOFT && pos[5] == WMM_OUI_TYPE && pos[1] > 4) {
 371                 if (pos[6] == WMM_OUI_SUBTYPE_INFORMATION_ELEMENT) {
 372                         ie->wmm = &pos[2];
 373                         ie->wmm_len = pos[1];
 374                         wpa_hexdump(MSG_DEBUG, "WPA: WMM IE",
 375                                     ie->wmm, ie->wmm_len);
 376                 } else if (pos[6] == WMM_OUI_SUBTYPE_PARAMETER_ELEMENT) {
 377                         ie->wmm = &pos[2];
 378                         ie->wmm_len = pos[1];
 379                         wpa_hexdump(MSG_DEBUG, "WPA: WMM Parameter Element",
 380                                     ie->wmm, ie->wmm_len);
 381                 }
 382         }
 383         return 0;
 384 }
 385
 386
 387 /**
 388  * wpa_parse_generic - Parse EAPOL-Key Key Data Generic IEs
 389  * @pos: Pointer to the IE header
 390  * @end: Pointer to the end of the Key Data buffer
 391  * @ie: Pointer to parsed IE data
 392  * Returns: 0 on success, 1 if end mark is found, -1 on failure
 393  */
 394 static int wpa_parse_generic(const u8 *pos, const u8 *end,
 395                              struct wpa_eapol_ie_parse *ie)
 396 {
 397         if (pos[1] == 0)
 398                 return 1;
 399
 400         if (pos[1] >= 6 &&
 401             RSN_SELECTOR_GET(pos + 2) == WPA_OUI_TYPE &&
 402             pos[2 + WPA_SELECTOR_LEN] == 1 &&
 403             pos[2 + WPA_SELECTOR_LEN + 1] == 0) {
 404                 ie->wpa_ie = pos;
 405                 ie->wpa_ie_len = pos[1] + 2;
 406                 wpa_hexdump(MSG_DEBUG, "WPA: WPA IE in EAPOL-Key",
 407                             ie->wpa_ie, ie->wpa_ie_len);
 408                 return 0;
 409         }
 410
 411         if (1 + RSN_SELECTOR_LEN < end - pos &&
 412             pos[1] >= RSN_SELECTOR_LEN + PMKID_LEN &&
 413             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_PMKID) {
 414                 ie->pmkid = pos + 2 + RSN_SELECTOR_LEN;
 415                 wpa_hexdump(MSG_DEBUG, "WPA: PMKID 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_GROUPKEY) {
 422                 ie->gtk = pos + 2 + RSN_SELECTOR_LEN;
 423                 ie->gtk_len = pos[1] - RSN_SELECTOR_LEN;
 424                 wpa_hexdump_key(MSG_DEBUG, "WPA: GTK 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_MAC_ADDR) {
 431                 ie->mac_addr = pos + 2 + RSN_SELECTOR_LEN;
 432                 ie->mac_addr_len = pos[1] - RSN_SELECTOR_LEN;
 433                 wpa_hexdump(MSG_DEBUG, "WPA: MAC Address in EAPOL-Key",
 434                             pos, pos[1] + 2);
 435                 return 0;
 436         }
 437
 438 #ifdef CONFIG_IEEE80211W
 439         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 440             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_IGTK) {
 441                 ie->igtk = pos + 2 + RSN_SELECTOR_LEN;
 442                 ie->igtk_len = pos[1] - RSN_SELECTOR_LEN;
 443                 wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK in EAPOL-Key",
 444                                 pos, pos[1] + 2);
 445                 return 0;
 446         }
 447 #endif /* CONFIG_IEEE80211W */
 448
 449 #ifdef CONFIG_P2P
 450         if (pos[1] >= RSN_SELECTOR_LEN + 1 &&
 451             RSN_SELECTOR_GET(pos + 2) == WFA_KEY_DATA_IP_ADDR_REQ) {
 452                 ie->ip_addr_req = pos + 2 + RSN_SELECTOR_LEN;
 453                 wpa_hexdump(MSG_DEBUG, "WPA: IP Address Request in EAPOL-Key",
 454                             ie->ip_addr_req, pos[1] - RSN_SELECTOR_LEN);
 455                 return 0;
 456         }
 457
 458         if (pos[1] >= RSN_SELECTOR_LEN + 3 * 4 &&
 459             RSN_SELECTOR_GET(pos + 2) == WFA_KEY_DATA_IP_ADDR_ALLOC) {
 460                 ie->ip_addr_alloc = pos + 2 + RSN_SELECTOR_LEN;
 461                 wpa_hexdump(MSG_DEBUG,
 462                             "WPA: IP Address Allocation in EAPOL-Key",
 463                             ie->ip_addr_alloc, pos[1] - RSN_SELECTOR_LEN);
 464                 return 0;
 465         }
 466 #endif /* CONFIG_P2P */
 467
 468 #ifdef CONFIG_OCV
 469         if (pos[1] >= RSN_SELECTOR_LEN + 1 &&
 470             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_OCI) {
 471                 ie->oci = pos + 2 + RSN_SELECTOR_LEN;
 472                 ie->oci_len = pos[1] - RSN_SELECTOR_LEN;
 473                 wpa_hexdump(MSG_DEBUG, "WPA: OCI KDE in EAPOL-Key",
 474                             pos, pos[1] + 2);
 475                 return 0;
 476         }
 477 #endif /* CONFIG_OCV */
 478
 479         return 0;
 480 }
 481
 482
 483 /**
 484  * wpa_supplicant_parse_ies - Parse EAPOL-Key Key Data IEs
 485  * @buf: Pointer to the Key Data buffer
 486  * @len: Key Data Length
 487  * @ie: Pointer to parsed IE data
 488  * Returns: 0 on success, -1 on failure
 489  */
 490 int wpa_supplicant_parse_ies(const u8 *buf, size_t len,
 491                              struct wpa_eapol_ie_parse *ie)
 492 {
 493         const u8 *pos, *end;
 494         int ret = 0;
 495
 496         os_memset(ie, 0, sizeof(*ie));
 497         for (pos = buf, end = pos + len; end - pos > 1; pos += 2 + pos[1]) {
 498                 if (pos[0] == 0xdd &&
 499                     ((pos == buf + len - 1) || pos[1] == 0)) {
 500                         /* Ignore padding */
 501                         break;
 502                 }
 503                 if (2 + pos[1] > end - pos) {
 504                         wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key Key Data "
 505                                    "underflow (ie=%d len=%d pos=%d)",
 506                                    pos[0], pos[1], (int) (pos - buf));
 507                         wpa_hexdump_key(MSG_DEBUG, "WPA: Key Data",
 508                                         buf, len);
 509                         ret = -1;
 510                         break;
 511                 }
 512                 if (*pos == WLAN_EID_RSN) {
 513                         ie->rsn_ie = pos;
 514                         ie->rsn_ie_len = pos[1] + 2;
 515                         wpa_hexdump(MSG_DEBUG, "WPA: RSN IE in EAPOL-Key",
 516                                     ie->rsn_ie, ie->rsn_ie_len);
 517                 } else if (*pos == WLAN_EID_MOBILITY_DOMAIN &&
 518                            pos[1] >= sizeof(struct rsn_mdie)) {
 519                         ie->mdie = pos;
 520                         ie->mdie_len = pos[1] + 2;
 521                         wpa_hexdump(MSG_DEBUG, "WPA: MDIE in EAPOL-Key",
 522                                     ie->mdie, ie->mdie_len);
 523                 } else if (*pos == WLAN_EID_FAST_BSS_TRANSITION &&
 524                            pos[1] >= sizeof(struct rsn_ftie)) {
 525                         ie->ftie = pos;
 526                         ie->ftie_len = pos[1] + 2;
 527                         wpa_hexdump(MSG_DEBUG, "WPA: FTIE in EAPOL-Key",
 528                                     ie->ftie, ie->ftie_len);
 529                 } else if (*pos == WLAN_EID_TIMEOUT_INTERVAL && pos[1] >= 5) {
 530                         if (pos[2] == WLAN_TIMEOUT_REASSOC_DEADLINE) {
 531                                 ie->reassoc_deadline = pos;
 532                                 wpa_hexdump(MSG_DEBUG, "WPA: Reassoc Deadline "
 533                                             "in EAPOL-Key",
 534                                             ie->reassoc_deadline, pos[1] + 2);
 535                         } else if (pos[2] == WLAN_TIMEOUT_KEY_LIFETIME) {
 536                                 ie->key_lifetime = pos;
 537                                 wpa_hexdump(MSG_DEBUG, "WPA: KeyLifetime "
 538                                             "in EAPOL-Key",
 539                                             ie->key_lifetime, pos[1] + 2);
 540                         } else {
 541                                 wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized "
 542                                             "EAPOL-Key Key Data IE",
 543                                             pos, 2 + pos[1]);
 544                         }
 545                 } else if (*pos == WLAN_EID_LINK_ID) {
 546                         if (pos[1] >= 18) {
 547                                 ie->lnkid = pos;
 548                                 ie->lnkid_len = pos[1] + 2;
 549                         }
 550                 } else if (*pos == WLAN_EID_EXT_CAPAB) {
 551                         ie->ext_capab = pos;
 552                         ie->ext_capab_len = pos[1] + 2;
 553                 } else if (*pos == WLAN_EID_SUPP_RATES) {
 554                         ie->supp_rates = pos;
 555                         ie->supp_rates_len = pos[1] + 2;
 556                 } else if (*pos == WLAN_EID_EXT_SUPP_RATES) {
 557                         ie->ext_supp_rates = pos;
 558                         ie->ext_supp_rates_len = pos[1] + 2;
 559                 } else if (*pos == WLAN_EID_HT_CAP &&
 560                            pos[1] >= sizeof(struct ieee80211_ht_capabilities)) {
 561                         ie->ht_capabilities = pos + 2;
 562                 } else if (*pos == WLAN_EID_VHT_AID) {
 563                         if (pos[1] >= 2)
 564                                 ie->aid = WPA_GET_LE16(pos + 2) & 0x3fff;
 565                 } else if (*pos == WLAN_EID_VHT_CAP &&
 566                            pos[1] >= sizeof(struct ieee80211_vht_capabilities))
 567                 {
 568                         ie->vht_capabilities = pos + 2;
 569                 } else if (*pos == WLAN_EID_QOS && pos[1] >= 1) {
 570                         ie->qosinfo = pos[2];
 571                 } else if (*pos == WLAN_EID_SUPPORTED_CHANNELS) {
 572                         ie->supp_channels = pos + 2;
 573                         ie->supp_channels_len = pos[1];
 574                 } else if (*pos == WLAN_EID_SUPPORTED_OPERATING_CLASSES) {
 575                         /*
 576                          * The value of the Length field of the Supported
 577                          * Operating Classes element is between 2 and 253.
 578                          * Silently skip invalid elements to avoid interop
 579                          * issues when trying to use the value.
 580                          */
 581                         if (pos[1] >= 2 && pos[1] <= 253) {
 582                                 ie->supp_oper_classes = pos + 2;
 583                                 ie->supp_oper_classes_len = pos[1];
 584                         }
 585                 } else if (*pos == WLAN_EID_VENDOR_SPECIFIC) {
 586                         ret = wpa_parse_generic(pos, end, ie);
 587                         if (ret < 0)
 588                                 break;
 589                         if (ret > 0) {
 590                                 ret = 0;
 591                                 break;
 592                         }
 593
 594                         ret = wpa_parse_vendor_specific(pos, end, ie);
 595                         if (ret < 0)
 596                                 break;
 597                         if (ret > 0) {
 598                                 ret = 0;
 599                                 break;
 600                         }
 601                 } else {
 602                         wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized EAPOL-Key "
 603                                     "Key Data IE", pos, 2 + pos[1]);
 604                 }
 605         }
 606
 607         return ret;
 608 }