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 { 87 wpa_printf(MSG_WARNING, "Invalid key management type (%d).", 88 key_mgmt); 89 return -1; 90 } 91 pos += WPA_SELECTOR_LEN; 92 93 /* WPA Capabilities; use defaults, so no need to include it */ 94 95 hdr->len = (pos - wpa_ie) - 2; 96 97 WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len); 98 99 return pos - wpa_ie; 100 } 101 102 103 static int wpa_gen_wpa_ie_rsn(u8 *rsn_ie, size_t rsn_ie_len, 104 int pairwise_cipher, int group_cipher, 105 int key_mgmt, int mgmt_group_cipher, 106 struct wpa_sm *sm) 107 { 108 #ifndef CONFIG_NO_WPA2 109 u8 *pos; 110 struct rsn_ie_hdr *hdr; 111 u16 capab; 112 u32 suite; 113 114 if (rsn_ie_len < sizeof(*hdr) + RSN_SELECTOR_LEN + 115 2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN + 2 + 116 (sm->cur_pmksa ? 2 + PMKID_LEN : 0)) { 117 wpa_printf(MSG_DEBUG, "RSN: Too short IE buffer (%lu bytes)", 118 (unsigned long) rsn_ie_len); 119 return -1; 120 } 121 122 hdr = (struct rsn_ie_hdr *) rsn_ie; 123 hdr->elem_id = WLAN_EID_RSN; 124 WPA_PUT_LE16(hdr->version, RSN_VERSION); 125 pos = (u8 *) (hdr + 1); 126 127 suite = wpa_cipher_to_suite(WPA_PROTO_RSN, group_cipher); 128 if (suite == 0) { 129 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).", 130 group_cipher); 131 return -1; 132 } 133 RSN_SELECTOR_PUT(pos, suite); 134 pos += RSN_SELECTOR_LEN; 135 136 *pos++ = 1; 137 *pos++ = 0; 138 suite = wpa_cipher_to_suite(WPA_PROTO_RSN, pairwise_cipher); 139 if (suite == 0 || 140 (!wpa_cipher_valid_pairwise(pairwise_cipher) && 141 pairwise_cipher != WPA_CIPHER_NONE)) { 142 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).", 143 pairwise_cipher); 144 return -1; 145 } 146 RSN_SELECTOR_PUT(pos, suite); 147 pos += RSN_SELECTOR_LEN; 148 149 *pos++ = 1; 150 *pos++ = 0; 151 if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) { 152 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_UNSPEC_802_1X); 153 } else if (key_mgmt == WPA_KEY_MGMT_PSK) { 154 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X); 155 #ifdef CONFIG_IEEE80211R 156 } else if (key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) { 157 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X); 158 } else if (key_mgmt == WPA_KEY_MGMT_FT_PSK) { 159 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK); 160 #endif /* CONFIG_IEEE80211R */ 161 #ifdef CONFIG_IEEE80211W 162 } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SHA256) { 163 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SHA256); 164 } else if (key_mgmt == WPA_KEY_MGMT_PSK_SHA256) { 165 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_SHA256); 166 #endif /* CONFIG_IEEE80211W */ 167 } else { 168 wpa_printf(MSG_WARNING, "Invalid key management type (%d).", 169 key_mgmt); 170 return -1; 171 } 172 pos += RSN_SELECTOR_LEN; 173 174 /* RSN Capabilities */ 175 capab = 0; 176 #ifdef CONFIG_IEEE80211W 177 if (sm->mfp) 178 capab |= WPA_CAPABILITY_MFPC; 179 if (sm->mfp == 2) 180 capab |= WPA_CAPABILITY_MFPR; 181 #endif /* CONFIG_IEEE80211W */ 182 WPA_PUT_LE16(pos, capab); 183 pos += 2; 184 185 if (sm->cur_pmksa) { 186 /* PMKID Count (2 octets, little endian) */ 187 *pos++ = 1; 188 *pos++ = 0; 189 /* PMKID */ 190 os_memcpy(pos, sm->cur_pmksa->pmkid, PMKID_LEN); 191 pos += PMKID_LEN; 192 } 193 194 #ifdef CONFIG_IEEE80211W 195 if (mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) { 196 if (!sm->cur_pmksa) { 197 /* PMKID Count */ 198 WPA_PUT_LE16(pos, 0); 199 pos += 2; 200 } 201 202 /* Management Group Cipher Suite */ 203 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC); 204 pos += RSN_SELECTOR_LEN; 205 } 206 #endif /* CONFIG_IEEE80211W */ 207 208 hdr->len = (pos - rsn_ie) - 2; 209 210 WPA_ASSERT((size_t) (pos - rsn_ie) <= rsn_ie_len); 211 212 return pos - rsn_ie; 213 #else /* CONFIG_NO_WPA2 */ 214 return -1; 215 #endif /* CONFIG_NO_WPA2 */ 216 } 217 218 219 /** 220 * wpa_gen_wpa_ie - Generate WPA/RSN IE based on current security policy 221 * @sm: Pointer to WPA state machine data from wpa_sm_init() 222 * @wpa_ie: Pointer to memory area for the generated WPA/RSN IE 223 * @wpa_ie_len: Maximum length of the generated WPA/RSN IE 224 * Returns: Length of the generated WPA/RSN IE or -1 on failure 225 */ 226 int wpa_gen_wpa_ie(struct wpa_sm *sm, u8 *wpa_ie, size_t wpa_ie_len) 227 { 228 if (sm->proto == WPA_PROTO_RSN) 229 return wpa_gen_wpa_ie_rsn(wpa_ie, wpa_ie_len, 230 sm->pairwise_cipher, 231 sm->group_cipher, 232 sm->key_mgmt, sm->mgmt_group_cipher, 233 sm); 234 else 235 return wpa_gen_wpa_ie_wpa(wpa_ie, wpa_ie_len, 236 sm->pairwise_cipher, 237 sm->group_cipher, 238 sm->key_mgmt); 239 } 240 241 242 /** 243 * wpa_parse_generic - Parse EAPOL-Key Key Data Generic IEs 244 * @pos: Pointer to the IE header 245 * @end: Pointer to the end of the Key Data buffer 246 * @ie: Pointer to parsed IE data 247 * Returns: 0 on success, 1 if end mark is found, -1 on failure 248 */ 249 static int wpa_parse_generic(const u8 *pos, const u8 *end, 250 struct wpa_eapol_ie_parse *ie) 251 { 252 if (pos[1] == 0) 253 return 1; 254 255 if (pos[1] >= 6 && 256 RSN_SELECTOR_GET(pos + 2) == WPA_OUI_TYPE && 257 pos[2 + WPA_SELECTOR_LEN] == 1 && 258 pos[2 + WPA_SELECTOR_LEN + 1] == 0) { 259 ie->wpa_ie = pos; 260 ie->wpa_ie_len = pos[1] + 2; 261 wpa_hexdump(MSG_DEBUG, "WPA: WPA IE in EAPOL-Key", 262 ie->wpa_ie, ie->wpa_ie_len); 263 return 0; 264 } 265 266 if (pos + 1 + RSN_SELECTOR_LEN < end && 267 pos[1] >= RSN_SELECTOR_LEN + PMKID_LEN && 268 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_PMKID) { 269 ie->pmkid = pos + 2 + RSN_SELECTOR_LEN; 270 wpa_hexdump(MSG_DEBUG, "WPA: PMKID in EAPOL-Key", 271 pos, pos[1] + 2); 272 return 0; 273 } 274 275 if (pos[1] > RSN_SELECTOR_LEN + 2 && 276 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_GROUPKEY) { 277 ie->gtk = pos + 2 + RSN_SELECTOR_LEN; 278 ie->gtk_len = pos[1] - RSN_SELECTOR_LEN; 279 wpa_hexdump_key(MSG_DEBUG, "WPA: GTK in EAPOL-Key", 280 pos, pos[1] + 2); 281 return 0; 282 } 283 284 if (pos[1] > RSN_SELECTOR_LEN + 2 && 285 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_MAC_ADDR) { 286 ie->mac_addr = pos + 2 + RSN_SELECTOR_LEN; 287 ie->mac_addr_len = pos[1] - RSN_SELECTOR_LEN; 288 wpa_hexdump(MSG_DEBUG, "WPA: MAC Address in EAPOL-Key", 289 pos, pos[1] + 2); 290 return 0; 291 } 292 293 #ifdef CONFIG_PEERKEY 294 if (pos[1] > RSN_SELECTOR_LEN + 2 && 295 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_SMK) { 296 ie->smk = pos + 2 + RSN_SELECTOR_LEN; 297 ie->smk_len = pos[1] - RSN_SELECTOR_LEN; 298 wpa_hexdump_key(MSG_DEBUG, "WPA: SMK in EAPOL-Key", 299 pos, pos[1] + 2); 300 return 0; 301 } 302 303 if (pos[1] > RSN_SELECTOR_LEN + 2 && 304 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_NONCE) { 305 ie->nonce = pos + 2 + RSN_SELECTOR_LEN; 306 ie->nonce_len = pos[1] - RSN_SELECTOR_LEN; 307 wpa_hexdump(MSG_DEBUG, "WPA: Nonce in EAPOL-Key", 308 pos, pos[1] + 2); 309 return 0; 310 } 311 312 if (pos[1] > RSN_SELECTOR_LEN + 2 && 313 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_LIFETIME) { 314 ie->lifetime = pos + 2 + RSN_SELECTOR_LEN; 315 ie->lifetime_len = pos[1] - RSN_SELECTOR_LEN; 316 wpa_hexdump(MSG_DEBUG, "WPA: Lifetime in EAPOL-Key", 317 pos, pos[1] + 2); 318 return 0; 319 } 320 321 if (pos[1] > RSN_SELECTOR_LEN + 2 && 322 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_ERROR) { 323 ie->error = pos + 2 + RSN_SELECTOR_LEN; 324 ie->error_len = pos[1] - RSN_SELECTOR_LEN; 325 wpa_hexdump(MSG_DEBUG, "WPA: Error in EAPOL-Key", 326 pos, pos[1] + 2); 327 return 0; 328 } 329 #endif /* CONFIG_PEERKEY */ 330 331 #ifdef CONFIG_IEEE80211W 332 if (pos[1] > RSN_SELECTOR_LEN + 2 && 333 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_IGTK) { 334 ie->igtk = pos + 2 + RSN_SELECTOR_LEN; 335 ie->igtk_len = pos[1] - RSN_SELECTOR_LEN; 336 wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK in EAPOL-Key", 337 pos, pos[1] + 2); 338 return 0; 339 } 340 #endif /* CONFIG_IEEE80211W */ 341 342 return 0; 343 } 344 345 346 /** 347 * wpa_supplicant_parse_ies - Parse EAPOL-Key Key Data IEs 348 * @buf: Pointer to the Key Data buffer 349 * @len: Key Data Length 350 * @ie: Pointer to parsed IE data 351 * Returns: 0 on success, -1 on failure 352 */ 353 int wpa_supplicant_parse_ies(const u8 *buf, size_t len, 354 struct wpa_eapol_ie_parse *ie) 355 { 356 const u8 *pos, *end; 357 int ret = 0; 358 359 os_memset(ie, 0, sizeof(*ie)); 360 for (pos = buf, end = pos + len; pos + 1 < end; pos += 2 + pos[1]) { 361 if (pos[0] == 0xdd && 362 ((pos == buf + len - 1) || pos[1] == 0)) { 363 /* Ignore padding */ 364 break; 365 } 366 if (pos + 2 + pos[1] > end) { 367 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key Key Data " 368 "underflow (ie=%d len=%d pos=%d)", 369 pos[0], pos[1], (int) (pos - buf)); 370 wpa_hexdump_key(MSG_DEBUG, "WPA: Key Data", 371 buf, len); 372 ret = -1; 373 break; 374 } 375 if (*pos == WLAN_EID_RSN) { 376 ie->rsn_ie = pos; 377 ie->rsn_ie_len = pos[1] + 2; 378 wpa_hexdump(MSG_DEBUG, "WPA: RSN IE in EAPOL-Key", 379 ie->rsn_ie, ie->rsn_ie_len); 380 } else if (*pos == WLAN_EID_MOBILITY_DOMAIN) { 381 ie->mdie = pos; 382 ie->mdie_len = pos[1] + 2; 383 wpa_hexdump(MSG_DEBUG, "WPA: MDIE in EAPOL-Key", 384 ie->mdie, ie->mdie_len); 385 } else if (*pos == WLAN_EID_FAST_BSS_TRANSITION) { 386 ie->ftie = pos; 387 ie->ftie_len = pos[1] + 2; 388 wpa_hexdump(MSG_DEBUG, "WPA: FTIE in EAPOL-Key", 389 ie->ftie, ie->ftie_len); 390 } else if (*pos == WLAN_EID_TIMEOUT_INTERVAL && pos[1] >= 5) { 391 if (pos[2] == WLAN_TIMEOUT_REASSOC_DEADLINE) { 392 ie->reassoc_deadline = pos; 393 wpa_hexdump(MSG_DEBUG, "WPA: Reassoc Deadline " 394 "in EAPOL-Key", 395 ie->reassoc_deadline, pos[1] + 2); 396 } else if (pos[2] == WLAN_TIMEOUT_KEY_LIFETIME) { 397 ie->key_lifetime = pos; 398 wpa_hexdump(MSG_DEBUG, "WPA: KeyLifetime " 399 "in EAPOL-Key", 400 ie->key_lifetime, pos[1] + 2); 401 } else { 402 wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized " 403 "EAPOL-Key Key Data IE", 404 pos, 2 + pos[1]); 405 } 406 } else if (*pos == WLAN_EID_LINK_ID) { 407 if (pos[1] >= 18) { 408 ie->lnkid = pos; 409 ie->lnkid_len = pos[1] + 2; 410 } 411 } else if (*pos == WLAN_EID_EXT_CAPAB) { 412 ie->ext_capab = pos; 413 ie->ext_capab_len = pos[1] + 2; 414 } else if (*pos == WLAN_EID_SUPP_RATES) { 415 ie->supp_rates = pos; 416 ie->supp_rates_len = pos[1] + 2; 417 } else if (*pos == WLAN_EID_EXT_SUPP_RATES) { 418 ie->ext_supp_rates = pos; 419 ie->ext_supp_rates_len = pos[1] + 2; 420 } else if (*pos == WLAN_EID_VENDOR_SPECIFIC) { 421 ret = wpa_parse_generic(pos, end, ie); 422 if (ret < 0) 423 break; 424 if (ret > 0) { 425 ret = 0; 426 break; 427 } 428 } else { 429 wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized EAPOL-Key " 430 "Key Data IE", pos, 2 + pos[1]); 431 } 432 } 433 434 return ret; 435 } 436
