1 /* 2 * wpa_supplicant - WPA/RSN IE and KDE processing 3 * Copyright (c) 2003-2008, Jouni Malinen <j (at) 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 (mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) { 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, RSN_CIPHER_SUITE_AES_128_CMAC); 213 pos += RSN_SELECTOR_LEN; 214 } 215 #endif /* CONFIG_IEEE80211W */ 216 217 hdr->len = (pos - rsn_ie) - 2; 218 219 WPA_ASSERT((size_t) (pos - rsn_ie) <= rsn_ie_len); 220 221 return pos - rsn_ie; 222 } 223 224 225 /** 226 * wpa_gen_wpa_ie - Generate WPA/RSN IE based on current security policy 227 * @sm: Pointer to WPA state machine data from wpa_sm_init() 228 * @wpa_ie: Pointer to memory area for the generated WPA/RSN IE 229 * @wpa_ie_len: Maximum length of the generated WPA/RSN IE 230 * Returns: Length of the generated WPA/RSN IE or -1 on failure 231 */ 232 int wpa_gen_wpa_ie(struct wpa_sm *sm, u8 *wpa_ie, size_t wpa_ie_len) 233 { 234 if (sm->proto == WPA_PROTO_RSN) 235 return wpa_gen_wpa_ie_rsn(wpa_ie, wpa_ie_len, 236 sm->pairwise_cipher, 237 sm->group_cipher, 238 sm->key_mgmt, sm->mgmt_group_cipher, 239 sm); 240 else 241 return wpa_gen_wpa_ie_wpa(wpa_ie, wpa_ie_len, 242 sm->pairwise_cipher, 243 sm->group_cipher, 244 sm->key_mgmt); 245 } 246 247 248 /** 249 * wpa_parse_generic - Parse EAPOL-Key Key Data Generic IEs 250 * @pos: Pointer to the IE header 251 * @end: Pointer to the end of the Key Data buffer 252 * @ie: Pointer to parsed IE data 253 * Returns: 0 on success, 1 if end mark is found, -1 on failure 254 */ 255 static int wpa_parse_generic(const u8 *pos, const u8 *end, 256 struct wpa_eapol_ie_parse *ie) 257 { 258 if (pos[1] == 0) 259 return 1; 260 261 if (pos[1] >= 6 && 262 RSN_SELECTOR_GET(pos + 2) == WPA_OUI_TYPE && 263 pos[2 + WPA_SELECTOR_LEN] == 1 && 264 pos[2 + WPA_SELECTOR_LEN + 1] == 0) { 265 ie->wpa_ie = pos; 266 ie->wpa_ie_len = pos[1] + 2; 267 wpa_hexdump(MSG_DEBUG, "WPA: WPA IE in EAPOL-Key", 268 ie->wpa_ie, ie->wpa_ie_len); 269 return 0; 270 } 271 272 if (pos + 1 + RSN_SELECTOR_LEN < end && 273 pos[1] >= RSN_SELECTOR_LEN + PMKID_LEN && 274 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_PMKID) { 275 ie->pmkid = pos + 2 + RSN_SELECTOR_LEN; 276 wpa_hexdump(MSG_DEBUG, "WPA: PMKID in EAPOL-Key", 277 pos, pos[1] + 2); 278 return 0; 279 } 280 281 if (pos[1] > RSN_SELECTOR_LEN + 2 && 282 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_GROUPKEY) { 283 ie->gtk = pos + 2 + RSN_SELECTOR_LEN; 284 ie->gtk_len = pos[1] - RSN_SELECTOR_LEN; 285 wpa_hexdump_key(MSG_DEBUG, "WPA: GTK in EAPOL-Key", 286 pos, pos[1] + 2); 287 return 0; 288 } 289 290 if (pos[1] > RSN_SELECTOR_LEN + 2 && 291 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_MAC_ADDR) { 292 ie->mac_addr = pos + 2 + RSN_SELECTOR_LEN; 293 ie->mac_addr_len = pos[1] - RSN_SELECTOR_LEN; 294 wpa_hexdump(MSG_DEBUG, "WPA: MAC Address in EAPOL-Key", 295 pos, pos[1] + 2); 296 return 0; 297 } 298 299 #ifdef CONFIG_PEERKEY 300 if (pos[1] > RSN_SELECTOR_LEN + 2 && 301 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_SMK) { 302 ie->smk = pos + 2 + RSN_SELECTOR_LEN; 303 ie->smk_len = pos[1] - RSN_SELECTOR_LEN; 304 wpa_hexdump_key(MSG_DEBUG, "WPA: SMK in EAPOL-Key", 305 pos, pos[1] + 2); 306 return 0; 307 } 308 309 if (pos[1] > RSN_SELECTOR_LEN + 2 && 310 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_NONCE) { 311 ie->nonce = pos + 2 + RSN_SELECTOR_LEN; 312 ie->nonce_len = pos[1] - RSN_SELECTOR_LEN; 313 wpa_hexdump(MSG_DEBUG, "WPA: Nonce in EAPOL-Key", 314 pos, pos[1] + 2); 315 return 0; 316 } 317 318 if (pos[1] > RSN_SELECTOR_LEN + 2 && 319 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_LIFETIME) { 320 ie->lifetime = pos + 2 + RSN_SELECTOR_LEN; 321 ie->lifetime_len = pos[1] - RSN_SELECTOR_LEN; 322 wpa_hexdump(MSG_DEBUG, "WPA: Lifetime in EAPOL-Key", 323 pos, pos[1] + 2); 324 return 0; 325 } 326 327 if (pos[1] > RSN_SELECTOR_LEN + 2 && 328 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_ERROR) { 329 ie->error = pos + 2 + RSN_SELECTOR_LEN; 330 ie->error_len = pos[1] - RSN_SELECTOR_LEN; 331 wpa_hexdump(MSG_DEBUG, "WPA: Error in EAPOL-Key", 332 pos, pos[1] + 2); 333 return 0; 334 } 335 #endif /* CONFIG_PEERKEY */ 336 337 #ifdef CONFIG_IEEE80211W 338 if (pos[1] > RSN_SELECTOR_LEN + 2 && 339 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_IGTK) { 340 ie->igtk = pos + 2 + RSN_SELECTOR_LEN; 341 ie->igtk_len = pos[1] - RSN_SELECTOR_LEN; 342 wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK in EAPOL-Key", 343 pos, pos[1] + 2); 344 return 0; 345 } 346 #endif /* CONFIG_IEEE80211W */ 347 348 return 0; 349 } 350 351 352 /** 353 * wpa_supplicant_parse_ies - Parse EAPOL-Key Key Data IEs 354 * @buf: Pointer to the Key Data buffer 355 * @len: Key Data Length 356 * @ie: Pointer to parsed IE data 357 * Returns: 0 on success, -1 on failure 358 */ 359 int wpa_supplicant_parse_ies(const u8 *buf, size_t len, 360 struct wpa_eapol_ie_parse *ie) 361 { 362 const u8 *pos, *end; 363 int ret = 0; 364 365 os_memset(ie, 0, sizeof(*ie)); 366 for (pos = buf, end = pos + len; pos + 1 < end; pos += 2 + pos[1]) { 367 if (pos[0] == 0xdd && 368 ((pos == buf + len - 1) || pos[1] == 0)) { 369 /* Ignore padding */ 370 break; 371 } 372 if (pos + 2 + pos[1] > end) { 373 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key Key Data " 374 "underflow (ie=%d len=%d pos=%d)", 375 pos[0], pos[1], (int) (pos - buf)); 376 wpa_hexdump_key(MSG_DEBUG, "WPA: Key Data", 377 buf, len); 378 ret = -1; 379 break; 380 } 381 if (*pos == WLAN_EID_RSN) { 382 ie->rsn_ie = pos; 383 ie->rsn_ie_len = pos[1] + 2; 384 wpa_hexdump(MSG_DEBUG, "WPA: RSN IE in EAPOL-Key", 385 ie->rsn_ie, ie->rsn_ie_len); 386 } else if (*pos == WLAN_EID_MOBILITY_DOMAIN) { 387 ie->mdie = pos; 388 ie->mdie_len = pos[1] + 2; 389 wpa_hexdump(MSG_DEBUG, "WPA: MDIE in EAPOL-Key", 390 ie->mdie, ie->mdie_len); 391 } else if (*pos == WLAN_EID_FAST_BSS_TRANSITION) { 392 ie->ftie = pos; 393 ie->ftie_len = pos[1] + 2; 394 wpa_hexdump(MSG_DEBUG, "WPA: FTIE in EAPOL-Key", 395 ie->ftie, ie->ftie_len); 396 } else if (*pos == WLAN_EID_TIMEOUT_INTERVAL && pos[1] >= 5) { 397 if (pos[2] == WLAN_TIMEOUT_REASSOC_DEADLINE) { 398 ie->reassoc_deadline = pos; 399 wpa_hexdump(MSG_DEBUG, "WPA: Reassoc Deadline " 400 "in EAPOL-Key", 401 ie->reassoc_deadline, pos[1] + 2); 402 } else if (pos[2] == WLAN_TIMEOUT_KEY_LIFETIME) { 403 ie->key_lifetime = pos; 404 wpa_hexdump(MSG_DEBUG, "WPA: KeyLifetime " 405 "in EAPOL-Key", 406 ie->key_lifetime, pos[1] + 2); 407 } else { 408 wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized " 409 "EAPOL-Key Key Data IE", 410 pos, 2 + pos[1]); 411 } 412 } else if (*pos == WLAN_EID_LINK_ID) { 413 if (pos[1] >= 18) { 414 ie->lnkid = pos; 415 ie->lnkid_len = pos[1] + 2; 416 } 417 } else if (*pos == WLAN_EID_EXT_CAPAB) { 418 ie->ext_capab = pos; 419 ie->ext_capab_len = pos[1] + 2; 420 } else if (*pos == WLAN_EID_SUPP_RATES) { 421 ie->supp_rates = pos; 422 ie->supp_rates_len = pos[1] + 2; 423 } else if (*pos == WLAN_EID_EXT_SUPP_RATES) { 424 ie->ext_supp_rates = pos; 425 ie->ext_supp_rates_len = pos[1] + 2; 426 } else if (*pos == WLAN_EID_HT_CAP) { 427 ie->ht_capabilities = pos + 2; 428 ie->ht_capabilities_len = pos[1]; 429 } else if (*pos == WLAN_EID_VHT_AID) { 430 if (pos[1] >= 2) 431 ie->aid = WPA_GET_LE16(pos + 2); 432 } else if (*pos == WLAN_EID_VHT_CAP) { 433 ie->vht_capabilities = pos + 2; 434 ie->vht_capabilities_len = pos[1]; 435 } else if (*pos == WLAN_EID_QOS && pos[1] >= 1) { 436 ie->qosinfo = pos[2]; 437 } else if (*pos == WLAN_EID_VENDOR_SPECIFIC) { 438 ret = wpa_parse_generic(pos, end, ie); 439 if (ret < 0) 440 break; 441 if (ret > 0) { 442 ret = 0; 443 break; 444 } 445 } else { 446 wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized EAPOL-Key " 447 "Key Data IE", pos, 2 + pos[1]); 448 } 449 } 450 451 return ret; 452 } 453
