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 45 if (wpa_ie_len < sizeof(*hdr) + WPA_SELECTOR_LEN + 46 2 + WPA_SELECTOR_LEN + 2 + WPA_SELECTOR_LEN) 47 return -1; 48 49 hdr = (struct wpa_ie_hdr *) wpa_ie; 50 hdr->elem_id = WLAN_EID_VENDOR_SPECIFIC; 51 RSN_SELECTOR_PUT(hdr->oui, WPA_OUI_TYPE); 52 WPA_PUT_LE16(hdr->version, WPA_VERSION); 53 pos = (u8 *) (hdr + 1); 54 55 if (group_cipher == WPA_CIPHER_CCMP) { 56 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_CCMP); 57 } else if (group_cipher == WPA_CIPHER_TKIP) { 58 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_TKIP); 59 } else if (group_cipher == WPA_CIPHER_WEP104) { 60 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_WEP104); 61 } else if (group_cipher == WPA_CIPHER_WEP40) { 62 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_WEP40); 63 } else { 64 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).", 65 group_cipher); 66 return -1; 67 } 68 pos += WPA_SELECTOR_LEN; 69 70 *pos++ = 1; 71 *pos++ = 0; 72 if (pairwise_cipher == WPA_CIPHER_CCMP) { 73 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_CCMP); 74 } else if (pairwise_cipher == WPA_CIPHER_TKIP) { 75 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_TKIP); 76 } else if (pairwise_cipher == WPA_CIPHER_NONE) { 77 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_NONE); 78 } else { 79 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).", 80 pairwise_cipher); 81 return -1; 82 } 83 pos += WPA_SELECTOR_LEN; 84 85 *pos++ = 1; 86 *pos++ = 0; 87 if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) { 88 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_UNSPEC_802_1X); 89 } else if (key_mgmt == WPA_KEY_MGMT_PSK) { 90 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X); 91 } else if (key_mgmt == WPA_KEY_MGMT_WPA_NONE) { 92 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_NONE); 93 } else { 94 wpa_printf(MSG_WARNING, "Invalid key management type (%d).", 95 key_mgmt); 96 return -1; 97 } 98 pos += WPA_SELECTOR_LEN; 99 100 /* WPA Capabilities; use defaults, so no need to include it */ 101 102 hdr->len = (pos - wpa_ie) - 2; 103 104 WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len); 105 106 return pos - wpa_ie; 107 } 108 109 110 static int wpa_gen_wpa_ie_rsn(u8 *rsn_ie, size_t rsn_ie_len, 111 int pairwise_cipher, int group_cipher, 112 int key_mgmt, int mgmt_group_cipher, 113 struct wpa_sm *sm) 114 { 115 #ifndef CONFIG_NO_WPA2 116 u8 *pos; 117 struct rsn_ie_hdr *hdr; 118 u16 capab; 119 120 if (rsn_ie_len < sizeof(*hdr) + RSN_SELECTOR_LEN + 121 2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN + 2 + 122 (sm->cur_pmksa ? 2 + PMKID_LEN : 0)) { 123 wpa_printf(MSG_DEBUG, "RSN: Too short IE buffer (%lu bytes)", 124 (unsigned long) rsn_ie_len); 125 return -1; 126 } 127 128 hdr = (struct rsn_ie_hdr *) rsn_ie; 129 hdr->elem_id = WLAN_EID_RSN; 130 WPA_PUT_LE16(hdr->version, RSN_VERSION); 131 pos = (u8 *) (hdr + 1); 132 133 if (group_cipher == WPA_CIPHER_CCMP) { 134 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP); 135 } else if (group_cipher == WPA_CIPHER_TKIP) { 136 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP); 137 } else if (group_cipher == WPA_CIPHER_WEP104) { 138 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_WEP104); 139 } else if (group_cipher == WPA_CIPHER_WEP40) { 140 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_WEP40); 141 } else { 142 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).", 143 group_cipher); 144 return -1; 145 } 146 pos += RSN_SELECTOR_LEN; 147 148 *pos++ = 1; 149 *pos++ = 0; 150 if (pairwise_cipher == WPA_CIPHER_CCMP) { 151 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP); 152 } else if (pairwise_cipher == WPA_CIPHER_TKIP) { 153 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP); 154 } else if (pairwise_cipher == WPA_CIPHER_NONE) { 155 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NONE); 156 } else { 157 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).", 158 pairwise_cipher); 159 return -1; 160 } 161 pos += RSN_SELECTOR_LEN; 162 163 *pos++ = 1; 164 *pos++ = 0; 165 if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) { 166 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_UNSPEC_802_1X); 167 } else if (key_mgmt == WPA_KEY_MGMT_PSK) { 168 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X); 169 #ifdef CONFIG_IEEE80211R 170 } else if (key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) { 171 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X); 172 } else if (key_mgmt == WPA_KEY_MGMT_FT_PSK) { 173 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK); 174 #endif /* CONFIG_IEEE80211R */ 175 #ifdef CONFIG_IEEE80211W 176 } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SHA256) { 177 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SHA256); 178 } else if (key_mgmt == WPA_KEY_MGMT_PSK_SHA256) { 179 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_SHA256); 180 #endif /* CONFIG_IEEE80211W */ 181 } else { 182 wpa_printf(MSG_WARNING, "Invalid key management type (%d).", 183 key_mgmt); 184 return -1; 185 } 186 pos += RSN_SELECTOR_LEN; 187 188 /* RSN Capabilities */ 189 capab = 0; 190 #ifdef CONFIG_IEEE80211W 191 if (sm->mfp) 192 capab |= WPA_CAPABILITY_MFPC; 193 if (sm->mfp == 2) 194 capab |= WPA_CAPABILITY_MFPR; 195 #endif /* CONFIG_IEEE80211W */ 196 WPA_PUT_LE16(pos, capab); 197 pos += 2; 198 199 if (sm->cur_pmksa) { 200 /* PMKID Count (2 octets, little endian) */ 201 *pos++ = 1; 202 *pos++ = 0; 203 /* PMKID */ 204 os_memcpy(pos, sm->cur_pmksa->pmkid, PMKID_LEN); 205 pos += PMKID_LEN; 206 } 207 208 #ifdef CONFIG_IEEE80211W 209 if (mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) { 210 if (!sm->cur_pmksa) { 211 /* PMKID Count */ 212 WPA_PUT_LE16(pos, 0); 213 pos += 2; 214 } 215 216 /* Management Group Cipher Suite */ 217 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC); 218 pos += RSN_SELECTOR_LEN; 219 } 220 #endif /* CONFIG_IEEE80211W */ 221 222 hdr->len = (pos - rsn_ie) - 2; 223 224 WPA_ASSERT((size_t) (pos - rsn_ie) <= rsn_ie_len); 225 226 return pos - rsn_ie; 227 #else /* CONFIG_NO_WPA2 */ 228 return -1; 229 #endif /* CONFIG_NO_WPA2 */ 230 } 231 232 233 /** 234 * wpa_gen_wpa_ie - Generate WPA/RSN IE based on current security policy 235 * @sm: Pointer to WPA state machine data from wpa_sm_init() 236 * @wpa_ie: Pointer to memory area for the generated WPA/RSN IE 237 * @wpa_ie_len: Maximum length of the generated WPA/RSN IE 238 * Returns: Length of the generated WPA/RSN IE or -1 on failure 239 */ 240 int wpa_gen_wpa_ie(struct wpa_sm *sm, u8 *wpa_ie, size_t wpa_ie_len) 241 { 242 if (sm->proto == WPA_PROTO_RSN) 243 return wpa_gen_wpa_ie_rsn(wpa_ie, wpa_ie_len, 244 sm->pairwise_cipher, 245 sm->group_cipher, 246 sm->key_mgmt, sm->mgmt_group_cipher, 247 sm); 248 else 249 return wpa_gen_wpa_ie_wpa(wpa_ie, wpa_ie_len, 250 sm->pairwise_cipher, 251 sm->group_cipher, 252 sm->key_mgmt); 253 } 254 255 256 /** 257 * wpa_parse_generic - Parse EAPOL-Key Key Data Generic IEs 258 * @pos: Pointer to the IE header 259 * @end: Pointer to the end of the Key Data buffer 260 * @ie: Pointer to parsed IE data 261 * Returns: 0 on success, 1 if end mark is found, -1 on failure 262 */ 263 static int wpa_parse_generic(const u8 *pos, const u8 *end, 264 struct wpa_eapol_ie_parse *ie) 265 { 266 if (pos[1] == 0) 267 return 1; 268 269 if (pos[1] >= 6 && 270 RSN_SELECTOR_GET(pos + 2) == WPA_OUI_TYPE && 271 pos[2 + WPA_SELECTOR_LEN] == 1 && 272 pos[2 + WPA_SELECTOR_LEN + 1] == 0) { 273 ie->wpa_ie = pos; 274 ie->wpa_ie_len = pos[1] + 2; 275 wpa_hexdump(MSG_DEBUG, "WPA: WPA IE in EAPOL-Key", 276 ie->wpa_ie, ie->wpa_ie_len); 277 return 0; 278 } 279 280 if (pos + 1 + RSN_SELECTOR_LEN < end && 281 pos[1] >= RSN_SELECTOR_LEN + PMKID_LEN && 282 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_PMKID) { 283 ie->pmkid = pos + 2 + RSN_SELECTOR_LEN; 284 wpa_hexdump(MSG_DEBUG, "WPA: PMKID in EAPOL-Key", 285 pos, pos[1] + 2); 286 return 0; 287 } 288 289 if (pos[1] > RSN_SELECTOR_LEN + 2 && 290 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_GROUPKEY) { 291 ie->gtk = pos + 2 + RSN_SELECTOR_LEN; 292 ie->gtk_len = pos[1] - RSN_SELECTOR_LEN; 293 wpa_hexdump_key(MSG_DEBUG, "WPA: GTK in EAPOL-Key", 294 pos, pos[1] + 2); 295 return 0; 296 } 297 298 if (pos[1] > RSN_SELECTOR_LEN + 2 && 299 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_MAC_ADDR) { 300 ie->mac_addr = pos + 2 + RSN_SELECTOR_LEN; 301 ie->mac_addr_len = pos[1] - RSN_SELECTOR_LEN; 302 wpa_hexdump(MSG_DEBUG, "WPA: MAC Address in EAPOL-Key", 303 pos, pos[1] + 2); 304 return 0; 305 } 306 307 #ifdef CONFIG_PEERKEY 308 if (pos[1] > RSN_SELECTOR_LEN + 2 && 309 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_SMK) { 310 ie->smk = pos + 2 + RSN_SELECTOR_LEN; 311 ie->smk_len = pos[1] - RSN_SELECTOR_LEN; 312 wpa_hexdump_key(MSG_DEBUG, "WPA: SMK in EAPOL-Key", 313 pos, pos[1] + 2); 314 return 0; 315 } 316 317 if (pos[1] > RSN_SELECTOR_LEN + 2 && 318 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_NONCE) { 319 ie->nonce = pos + 2 + RSN_SELECTOR_LEN; 320 ie->nonce_len = pos[1] - RSN_SELECTOR_LEN; 321 wpa_hexdump(MSG_DEBUG, "WPA: Nonce in EAPOL-Key", 322 pos, pos[1] + 2); 323 return 0; 324 } 325 326 if (pos[1] > RSN_SELECTOR_LEN + 2 && 327 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_LIFETIME) { 328 ie->lifetime = pos + 2 + RSN_SELECTOR_LEN; 329 ie->lifetime_len = pos[1] - RSN_SELECTOR_LEN; 330 wpa_hexdump(MSG_DEBUG, "WPA: Lifetime in EAPOL-Key", 331 pos, pos[1] + 2); 332 return 0; 333 } 334 335 if (pos[1] > RSN_SELECTOR_LEN + 2 && 336 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_ERROR) { 337 ie->error = pos + 2 + RSN_SELECTOR_LEN; 338 ie->error_len = pos[1] - RSN_SELECTOR_LEN; 339 wpa_hexdump(MSG_DEBUG, "WPA: Error in EAPOL-Key", 340 pos, pos[1] + 2); 341 return 0; 342 } 343 #endif /* CONFIG_PEERKEY */ 344 345 #ifdef CONFIG_IEEE80211W 346 if (pos[1] > RSN_SELECTOR_LEN + 2 && 347 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_IGTK) { 348 ie->igtk = pos + 2 + RSN_SELECTOR_LEN; 349 ie->igtk_len = pos[1] - RSN_SELECTOR_LEN; 350 wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK in EAPOL-Key", 351 pos, pos[1] + 2); 352 return 0; 353 } 354 #endif /* CONFIG_IEEE80211W */ 355 356 return 0; 357 } 358 359 360 /** 361 * wpa_supplicant_parse_ies - Parse EAPOL-Key Key Data IEs 362 * @buf: Pointer to the Key Data buffer 363 * @len: Key Data Length 364 * @ie: Pointer to parsed IE data 365 * Returns: 0 on success, -1 on failure 366 */ 367 int wpa_supplicant_parse_ies(const u8 *buf, size_t len, 368 struct wpa_eapol_ie_parse *ie) 369 { 370 const u8 *pos, *end; 371 int ret = 0; 372 373 os_memset(ie, 0, sizeof(*ie)); 374 for (pos = buf, end = pos + len; pos + 1 < end; pos += 2 + pos[1]) { 375 if (pos[0] == 0xdd && 376 ((pos == buf + len - 1) || pos[1] == 0)) { 377 /* Ignore padding */ 378 break; 379 } 380 if (pos + 2 + pos[1] > end) { 381 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key Key Data " 382 "underflow (ie=%d len=%d pos=%d)", 383 pos[0], pos[1], (int) (pos - buf)); 384 wpa_hexdump_key(MSG_DEBUG, "WPA: Key Data", 385 buf, len); 386 ret = -1; 387 break; 388 } 389 if (*pos == WLAN_EID_RSN) { 390 ie->rsn_ie = pos; 391 ie->rsn_ie_len = pos[1] + 2; 392 wpa_hexdump(MSG_DEBUG, "WPA: RSN IE in EAPOL-Key", 393 ie->rsn_ie, ie->rsn_ie_len); 394 } else if (*pos == WLAN_EID_MOBILITY_DOMAIN) { 395 ie->mdie = pos; 396 ie->mdie_len = pos[1] + 2; 397 wpa_hexdump(MSG_DEBUG, "WPA: MDIE in EAPOL-Key", 398 ie->mdie, ie->mdie_len); 399 } else if (*pos == WLAN_EID_FAST_BSS_TRANSITION) { 400 ie->ftie = pos; 401 ie->ftie_len = pos[1] + 2; 402 wpa_hexdump(MSG_DEBUG, "WPA: FTIE in EAPOL-Key", 403 ie->ftie, ie->ftie_len); 404 } else if (*pos == WLAN_EID_TIMEOUT_INTERVAL && pos[1] >= 5) { 405 if (pos[2] == WLAN_TIMEOUT_REASSOC_DEADLINE) { 406 ie->reassoc_deadline = pos; 407 wpa_hexdump(MSG_DEBUG, "WPA: Reassoc Deadline " 408 "in EAPOL-Key", 409 ie->reassoc_deadline, pos[1] + 2); 410 } else if (pos[2] == WLAN_TIMEOUT_KEY_LIFETIME) { 411 ie->key_lifetime = pos; 412 wpa_hexdump(MSG_DEBUG, "WPA: KeyLifetime " 413 "in EAPOL-Key", 414 ie->key_lifetime, pos[1] + 2); 415 } else { 416 wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized " 417 "EAPOL-Key Key Data IE", 418 pos, 2 + pos[1]); 419 } 420 } else if (*pos == WLAN_EID_LINK_ID) { 421 if (pos[1] >= 18) { 422 ie->lnkid = pos; 423 ie->lnkid_len = pos[1] + 2; 424 } 425 } else if (*pos == WLAN_EID_EXT_CAPAB) { 426 ie->ext_capab = pos; 427 ie->ext_capab_len = pos[1] + 2; 428 } else if (*pos == WLAN_EID_SUPP_RATES) { 429 ie->supp_rates = pos; 430 ie->supp_rates_len = pos[1] + 2; 431 } else if (*pos == WLAN_EID_EXT_SUPP_RATES) { 432 ie->ext_supp_rates = pos; 433 ie->ext_supp_rates_len = pos[1] + 2; 434 } else if (*pos == WLAN_EID_VENDOR_SPECIFIC) { 435 ret = wpa_parse_generic(pos, end, ie); 436 if (ret < 0) 437 break; 438 if (ret > 0) { 439 ret = 0; 440 break; 441 } 442 } else { 443 wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized EAPOL-Key " 444 "Key Data IE", pos, 2 + pos[1]); 445 } 446 } 447 448 return ret; 449 } 450
