The Android Open Source Project | 845e012 | 2009-03-03 19:31:34 -0800 | [diff] [blame] | 1 | /* |
| 2 | * EAP peer method: EAP-PAX (RFC 4746) |
| 3 | * Copyright (c) 2005-2006, Jouni Malinen <j@w1.fi> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * Alternatively, this software may be distributed under the terms of BSD |
| 10 | * license. |
| 11 | * |
| 12 | * See README and COPYING for more details. |
| 13 | */ |
| 14 | |
| 15 | #include "includes.h" |
| 16 | |
| 17 | #include "common.h" |
| 18 | #include "eap_i.h" |
| 19 | #include "config_ssid.h" |
| 20 | #include "eap_pax_common.h" |
| 21 | #include "sha1.h" |
| 22 | #include "crypto.h" |
| 23 | |
| 24 | /* |
| 25 | * Note: only PAX_STD subprotocol is currently supported |
| 26 | * |
| 27 | * TODO: Add support with PAX_SEC with the mandatory to implement ciphersuite |
| 28 | * (HMAC_SHA1_128, IANA DH Group 14 (2048 bits), RSA-PKCS1-V1_5) and |
| 29 | * recommended ciphersuite (HMAC_SHA256_128, IANA DH Group 15 (3072 bits), |
| 30 | * RSAES-OAEP). |
| 31 | */ |
| 32 | |
| 33 | struct eap_pax_data { |
| 34 | enum { PAX_INIT, PAX_STD_2_SENT, PAX_DONE } state; |
| 35 | u8 mac_id, dh_group_id, public_key_id; |
| 36 | union { |
| 37 | u8 e[2 * EAP_PAX_RAND_LEN]; |
| 38 | struct { |
| 39 | u8 x[EAP_PAX_RAND_LEN]; /* server rand */ |
| 40 | u8 y[EAP_PAX_RAND_LEN]; /* client rand */ |
| 41 | } r; |
| 42 | } rand; |
| 43 | char *cid; |
| 44 | size_t cid_len; |
| 45 | u8 ak[EAP_PAX_AK_LEN]; |
| 46 | u8 mk[EAP_PAX_MK_LEN]; |
| 47 | u8 ck[EAP_PAX_CK_LEN]; |
| 48 | u8 ick[EAP_PAX_ICK_LEN]; |
| 49 | }; |
| 50 | |
| 51 | |
| 52 | static void eap_pax_deinit(struct eap_sm *sm, void *priv); |
| 53 | |
| 54 | |
| 55 | static void * eap_pax_init(struct eap_sm *sm) |
| 56 | { |
| 57 | struct wpa_ssid *config = eap_get_config(sm); |
| 58 | struct eap_pax_data *data; |
| 59 | |
| 60 | if (config == NULL || !config->nai || |
| 61 | (!config->eappsk && !config->password)) { |
| 62 | wpa_printf(MSG_INFO, "EAP-PAX: CID (nai) or key " |
| 63 | "(eappsk/password) not configured"); |
| 64 | return NULL; |
| 65 | } |
| 66 | |
| 67 | if (config->eappsk && config->eappsk_len != EAP_PAX_AK_LEN) { |
| 68 | wpa_printf(MSG_INFO, "EAP-PAX: incorrect key length (eappsk); " |
| 69 | "expected %d", EAP_PAX_AK_LEN); |
| 70 | return NULL; |
| 71 | } |
| 72 | |
| 73 | data = os_zalloc(sizeof(*data)); |
| 74 | if (data == NULL) |
| 75 | return NULL; |
| 76 | data->state = PAX_INIT; |
| 77 | |
| 78 | data->cid = os_malloc(config->nai_len); |
| 79 | if (data->cid == NULL) { |
| 80 | eap_pax_deinit(sm, data); |
| 81 | return NULL; |
| 82 | } |
| 83 | os_memcpy(data->cid, config->nai, config->nai_len); |
| 84 | data->cid_len = config->nai_len; |
| 85 | |
| 86 | if (config->eappsk) { |
| 87 | os_memcpy(data->ak, config->eappsk, EAP_PAX_AK_LEN); |
| 88 | } else { |
| 89 | u8 hash[SHA1_MAC_LEN]; |
| 90 | const unsigned char *addr[1]; |
| 91 | size_t len[1]; |
| 92 | addr[0] = config->password; |
| 93 | len[0] = config->password_len; |
| 94 | sha1_vector(1, addr, len, hash); |
| 95 | os_memcpy(data->ak, hash, EAP_PAX_AK_LEN); |
| 96 | } |
| 97 | |
| 98 | return data; |
| 99 | } |
| 100 | |
| 101 | |
| 102 | static void eap_pax_deinit(struct eap_sm *sm, void *priv) |
| 103 | { |
| 104 | struct eap_pax_data *data = priv; |
| 105 | os_free(data->cid); |
| 106 | os_free(data); |
| 107 | } |
| 108 | |
| 109 | |
| 110 | static struct eap_pax_hdr * eap_pax_alloc_resp(const struct eap_pax_hdr *req, |
| 111 | u16 resp_len, u8 op_code) |
| 112 | { |
| 113 | struct eap_pax_hdr *resp; |
| 114 | |
| 115 | resp = os_malloc(resp_len); |
| 116 | if (resp == NULL) |
| 117 | return NULL; |
| 118 | resp->code = EAP_CODE_RESPONSE; |
| 119 | resp->identifier = req->identifier; |
| 120 | resp->length = host_to_be16(resp_len); |
| 121 | resp->type = EAP_TYPE_PAX; |
| 122 | resp->op_code = op_code; |
| 123 | resp->flags = 0; |
| 124 | resp->mac_id = req->mac_id; |
| 125 | resp->dh_group_id = req->dh_group_id; |
| 126 | resp->public_key_id = req->public_key_id; |
| 127 | return resp; |
| 128 | } |
| 129 | |
| 130 | |
| 131 | static u8 * eap_pax_process_std_1(struct eap_pax_data *data, |
| 132 | struct eap_method_ret *ret, |
| 133 | const u8 *reqData, size_t reqDataLen, |
| 134 | size_t *respDataLen) |
| 135 | { |
| 136 | const struct eap_pax_hdr *req; |
| 137 | struct eap_pax_hdr *resp; |
| 138 | const u8 *pos; |
| 139 | u8 *rpos; |
| 140 | size_t left; |
| 141 | |
| 142 | wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-1 (received)"); |
| 143 | req = (const struct eap_pax_hdr *) reqData; |
| 144 | |
| 145 | if (data->state != PAX_INIT) { |
| 146 | wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-1 received in " |
| 147 | "unexpected state (%d) - ignored", data->state); |
| 148 | ret->ignore = TRUE; |
| 149 | return NULL; |
| 150 | } |
| 151 | |
| 152 | if (req->flags & EAP_PAX_FLAGS_CE) { |
| 153 | wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-1 with CE flag set - " |
| 154 | "ignored"); |
| 155 | ret->ignore = TRUE; |
| 156 | return NULL; |
| 157 | } |
| 158 | |
| 159 | left = reqDataLen - sizeof(*req); |
| 160 | |
| 161 | if (left < 2 + EAP_PAX_RAND_LEN) { |
| 162 | wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-1 with too short " |
| 163 | "payload"); |
| 164 | ret->ignore = TRUE; |
| 165 | return NULL; |
| 166 | } |
| 167 | |
| 168 | pos = (const u8 *) (req + 1); |
| 169 | if (WPA_GET_BE16(pos) != EAP_PAX_RAND_LEN) { |
| 170 | wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-1 with incorrect A " |
| 171 | "length %d (expected %d)", |
| 172 | WPA_GET_BE16(pos), EAP_PAX_RAND_LEN); |
| 173 | ret->ignore = TRUE; |
| 174 | return NULL; |
| 175 | } |
| 176 | |
| 177 | pos += 2; |
| 178 | left -= 2; |
| 179 | os_memcpy(data->rand.r.x, pos, EAP_PAX_RAND_LEN); |
| 180 | wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: X (server rand)", |
| 181 | data->rand.r.x, EAP_PAX_RAND_LEN); |
| 182 | pos += EAP_PAX_RAND_LEN; |
| 183 | left -= EAP_PAX_RAND_LEN; |
| 184 | |
| 185 | if (left > 0) { |
| 186 | wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ignored extra payload", |
| 187 | pos, left); |
| 188 | } |
| 189 | |
| 190 | if (hostapd_get_rand(data->rand.r.y, EAP_PAX_RAND_LEN)) { |
| 191 | wpa_printf(MSG_ERROR, "EAP-PAX: Failed to get random data"); |
| 192 | ret->ignore = TRUE; |
| 193 | return NULL; |
| 194 | } |
| 195 | wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Y (client rand)", |
| 196 | data->rand.r.y, EAP_PAX_RAND_LEN); |
| 197 | |
| 198 | if (eap_pax_initial_key_derivation(req->mac_id, data->ak, data->rand.e, |
| 199 | data->mk, data->ck, data->ick) < 0) |
| 200 | { |
| 201 | ret->ignore = TRUE; |
| 202 | return NULL; |
| 203 | } |
| 204 | |
| 205 | wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-2 (sending)"); |
| 206 | |
| 207 | *respDataLen = sizeof(*resp) + 2 + EAP_PAX_RAND_LEN + |
| 208 | 2 + data->cid_len + 2 + EAP_PAX_MAC_LEN + EAP_PAX_ICV_LEN; |
| 209 | resp = eap_pax_alloc_resp(req, *respDataLen, EAP_PAX_OP_STD_2); |
| 210 | if (resp == NULL) |
| 211 | return NULL; |
| 212 | |
| 213 | rpos = (u8 *) (resp + 1); |
| 214 | *rpos++ = 0; |
| 215 | *rpos++ = EAP_PAX_RAND_LEN; |
| 216 | os_memcpy(rpos, data->rand.r.y, EAP_PAX_RAND_LEN); |
| 217 | wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: B = Y (client rand)", |
| 218 | rpos, EAP_PAX_RAND_LEN); |
| 219 | rpos += EAP_PAX_RAND_LEN; |
| 220 | |
| 221 | WPA_PUT_BE16(rpos, data->cid_len); |
| 222 | rpos += 2; |
| 223 | os_memcpy(rpos, data->cid, data->cid_len); |
| 224 | wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-PAX: CID", rpos, data->cid_len); |
| 225 | rpos += data->cid_len; |
| 226 | |
| 227 | *rpos++ = 0; |
| 228 | *rpos++ = EAP_PAX_MAC_LEN; |
| 229 | eap_pax_mac(req->mac_id, data->ck, EAP_PAX_CK_LEN, |
| 230 | data->rand.r.x, EAP_PAX_RAND_LEN, |
| 231 | data->rand.r.y, EAP_PAX_RAND_LEN, |
| 232 | (u8 *) data->cid, data->cid_len, rpos); |
| 233 | wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: MAC_CK(A, B, CID)", |
| 234 | rpos, EAP_PAX_MAC_LEN); |
| 235 | rpos += EAP_PAX_MAC_LEN; |
| 236 | |
| 237 | /* Optional ADE could be added here, if needed */ |
| 238 | |
| 239 | eap_pax_mac(req->mac_id, data->ick, EAP_PAX_ICK_LEN, |
| 240 | (u8 *) resp, *respDataLen - EAP_PAX_ICV_LEN, |
| 241 | NULL, 0, NULL, 0, rpos); |
| 242 | wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", rpos, EAP_PAX_ICV_LEN); |
| 243 | rpos += EAP_PAX_ICV_LEN; |
| 244 | |
| 245 | data->state = PAX_STD_2_SENT; |
| 246 | data->mac_id = req->mac_id; |
| 247 | data->dh_group_id = req->dh_group_id; |
| 248 | data->public_key_id = req->public_key_id; |
| 249 | |
| 250 | return (u8 *) resp; |
| 251 | } |
| 252 | |
| 253 | |
| 254 | static u8 * eap_pax_process_std_3(struct eap_pax_data *data, |
| 255 | struct eap_method_ret *ret, |
| 256 | const u8 *reqData, size_t reqDataLen, |
| 257 | size_t *respDataLen) |
| 258 | { |
| 259 | const struct eap_pax_hdr *req; |
| 260 | struct eap_pax_hdr *resp; |
| 261 | u8 *rpos, mac[EAP_PAX_MAC_LEN]; |
| 262 | const u8 *pos; |
| 263 | size_t left; |
| 264 | |
| 265 | wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-3 (received)"); |
| 266 | req = (const struct eap_pax_hdr *) reqData; |
| 267 | |
| 268 | if (data->state != PAX_STD_2_SENT) { |
| 269 | wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-3 received in " |
| 270 | "unexpected state (%d) - ignored", data->state); |
| 271 | ret->ignore = TRUE; |
| 272 | return NULL; |
| 273 | } |
| 274 | |
| 275 | if (req->flags & EAP_PAX_FLAGS_CE) { |
| 276 | wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-3 with CE flag set - " |
| 277 | "ignored"); |
| 278 | ret->ignore = TRUE; |
| 279 | return NULL; |
| 280 | } |
| 281 | |
| 282 | left = reqDataLen - sizeof(*req); |
| 283 | |
| 284 | if (left < 2 + EAP_PAX_MAC_LEN) { |
| 285 | wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-3 with too short " |
| 286 | "payload"); |
| 287 | ret->ignore = TRUE; |
| 288 | return NULL; |
| 289 | } |
| 290 | |
| 291 | pos = (const u8 *) (req + 1); |
| 292 | if (WPA_GET_BE16(pos) != EAP_PAX_MAC_LEN) { |
| 293 | wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-3 with incorrect " |
| 294 | "MAC_CK length %d (expected %d)", |
| 295 | WPA_GET_BE16(pos), EAP_PAX_MAC_LEN); |
| 296 | ret->ignore = TRUE; |
| 297 | return NULL; |
| 298 | } |
| 299 | pos += 2; |
| 300 | left -= 2; |
| 301 | wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: MAC_CK(B, CID)", |
| 302 | pos, EAP_PAX_MAC_LEN); |
| 303 | eap_pax_mac(data->mac_id, data->ck, EAP_PAX_CK_LEN, |
| 304 | data->rand.r.y, EAP_PAX_RAND_LEN, |
| 305 | (u8 *) data->cid, data->cid_len, NULL, 0, mac); |
| 306 | if (os_memcmp(pos, mac, EAP_PAX_MAC_LEN) != 0) { |
| 307 | wpa_printf(MSG_INFO, "EAP-PAX: Invalid MAC_CK(B, CID) " |
| 308 | "received"); |
| 309 | wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: expected MAC_CK(B, CID)", |
| 310 | mac, EAP_PAX_MAC_LEN); |
| 311 | ret->methodState = METHOD_DONE; |
| 312 | ret->decision = DECISION_FAIL; |
| 313 | return NULL; |
| 314 | } |
| 315 | |
| 316 | pos += EAP_PAX_MAC_LEN; |
| 317 | left -= EAP_PAX_MAC_LEN; |
| 318 | |
| 319 | if (left > 0) { |
| 320 | wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ignored extra payload", |
| 321 | pos, left); |
| 322 | } |
| 323 | |
| 324 | wpa_printf(MSG_DEBUG, "EAP-PAX: PAX-ACK (sending)"); |
| 325 | |
| 326 | *respDataLen = sizeof(*resp) + EAP_PAX_ICV_LEN; |
| 327 | resp = eap_pax_alloc_resp(req, *respDataLen, EAP_PAX_OP_ACK); |
| 328 | if (resp == NULL) |
| 329 | return NULL; |
| 330 | |
| 331 | rpos = (u8 *) (resp + 1); |
| 332 | |
| 333 | /* Optional ADE could be added here, if needed */ |
| 334 | |
| 335 | eap_pax_mac(data->mac_id, data->ick, EAP_PAX_ICK_LEN, |
| 336 | (u8 *) resp, *respDataLen - EAP_PAX_ICV_LEN, |
| 337 | NULL, 0, NULL, 0, rpos); |
| 338 | wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", rpos, EAP_PAX_ICV_LEN); |
| 339 | |
| 340 | data->state = PAX_DONE; |
| 341 | ret->methodState = METHOD_DONE; |
| 342 | ret->decision = DECISION_UNCOND_SUCC; |
| 343 | ret->allowNotifications = FALSE; |
| 344 | |
| 345 | return (u8 *) resp; |
| 346 | } |
| 347 | |
| 348 | |
| 349 | static u8 * eap_pax_process(struct eap_sm *sm, void *priv, |
| 350 | struct eap_method_ret *ret, |
| 351 | const u8 *reqData, size_t reqDataLen, |
| 352 | size_t *respDataLen) |
| 353 | { |
| 354 | struct eap_pax_data *data = priv; |
| 355 | const struct eap_pax_hdr *req; |
| 356 | u8 *resp, icvbuf[EAP_PAX_ICV_LEN]; |
| 357 | const u8 *icv, *pos; |
| 358 | size_t len; |
| 359 | u16 flen; |
| 360 | |
| 361 | pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_PAX, |
| 362 | reqData, reqDataLen, &len); |
| 363 | if (pos == NULL || len < EAP_PAX_ICV_LEN) { |
| 364 | ret->ignore = TRUE; |
| 365 | return NULL; |
| 366 | } |
| 367 | req = (const struct eap_pax_hdr *) reqData; |
| 368 | flen = be_to_host16(req->length) - EAP_PAX_ICV_LEN; |
| 369 | |
| 370 | wpa_printf(MSG_DEBUG, "EAP-PAX: received frame: op_code 0x%x " |
| 371 | "flags 0x%x mac_id 0x%x dh_group_id 0x%x " |
| 372 | "public_key_id 0x%x", |
| 373 | req->op_code, req->flags, req->mac_id, req->dh_group_id, |
| 374 | req->public_key_id); |
| 375 | wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: received payload", |
| 376 | pos, len - EAP_PAX_ICV_LEN); |
| 377 | |
| 378 | if (data->state != PAX_INIT && data->mac_id != req->mac_id) { |
| 379 | wpa_printf(MSG_INFO, "EAP-PAX: MAC ID changed during " |
| 380 | "authentication (was 0x%d, is 0x%d)", |
| 381 | data->mac_id, req->mac_id); |
| 382 | ret->ignore = TRUE; |
| 383 | return NULL; |
| 384 | } |
| 385 | |
| 386 | if (data->state != PAX_INIT && data->dh_group_id != req->dh_group_id) { |
| 387 | wpa_printf(MSG_INFO, "EAP-PAX: DH Group ID changed during " |
| 388 | "authentication (was 0x%d, is 0x%d)", |
| 389 | data->dh_group_id, req->dh_group_id); |
| 390 | ret->ignore = TRUE; |
| 391 | return NULL; |
| 392 | } |
| 393 | |
| 394 | if (data->state != PAX_INIT && |
| 395 | data->public_key_id != req->public_key_id) { |
| 396 | wpa_printf(MSG_INFO, "EAP-PAX: Public Key ID changed during " |
| 397 | "authentication (was 0x%d, is 0x%d)", |
| 398 | data->public_key_id, req->public_key_id); |
| 399 | ret->ignore = TRUE; |
| 400 | return NULL; |
| 401 | } |
| 402 | |
| 403 | /* TODO: add support EAP_PAX_HMAC_SHA256_128 */ |
| 404 | if (req->mac_id != EAP_PAX_MAC_HMAC_SHA1_128) { |
| 405 | wpa_printf(MSG_INFO, "EAP-PAX: Unsupported MAC ID 0x%x", |
| 406 | req->mac_id); |
| 407 | ret->ignore = TRUE; |
| 408 | return NULL; |
| 409 | } |
| 410 | |
| 411 | if (req->dh_group_id != EAP_PAX_DH_GROUP_NONE) { |
| 412 | wpa_printf(MSG_INFO, "EAP-PAX: Unsupported DH Group ID 0x%x", |
| 413 | req->dh_group_id); |
| 414 | ret->ignore = TRUE; |
| 415 | return NULL; |
| 416 | } |
| 417 | |
| 418 | if (req->public_key_id != EAP_PAX_PUBLIC_KEY_NONE) { |
| 419 | wpa_printf(MSG_INFO, "EAP-PAX: Unsupported Public Key ID 0x%x", |
| 420 | req->public_key_id); |
| 421 | ret->ignore = TRUE; |
| 422 | return NULL; |
| 423 | } |
| 424 | |
| 425 | if (req->flags & EAP_PAX_FLAGS_MF) { |
| 426 | /* TODO: add support for reassembling fragments */ |
| 427 | wpa_printf(MSG_INFO, "EAP-PAX: fragmentation not supported - " |
| 428 | "ignored packet"); |
| 429 | ret->ignore = TRUE; |
| 430 | return NULL; |
| 431 | } |
| 432 | |
| 433 | icv = pos + len - EAP_PAX_ICV_LEN; |
| 434 | wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", icv, EAP_PAX_ICV_LEN); |
| 435 | if (req->op_code == EAP_PAX_OP_STD_1) { |
| 436 | eap_pax_mac(req->mac_id, (u8 *) "", 0, |
| 437 | reqData, flen, NULL, 0, NULL, 0, icvbuf); |
| 438 | } else { |
| 439 | eap_pax_mac(req->mac_id, data->ick, EAP_PAX_ICK_LEN, |
| 440 | reqData, flen, NULL, 0, NULL, 0, icvbuf); |
| 441 | } |
| 442 | if (os_memcmp(icv, icvbuf, EAP_PAX_ICV_LEN) != 0) { |
| 443 | wpa_printf(MSG_DEBUG, "EAP-PAX: invalid ICV - ignoring the " |
| 444 | "message"); |
| 445 | wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: expected ICV", |
| 446 | icvbuf, EAP_PAX_ICV_LEN); |
| 447 | ret->ignore = TRUE; |
| 448 | return NULL; |
| 449 | } |
| 450 | |
| 451 | ret->ignore = FALSE; |
| 452 | ret->methodState = METHOD_MAY_CONT; |
| 453 | ret->decision = DECISION_FAIL; |
| 454 | ret->allowNotifications = TRUE; |
| 455 | |
| 456 | switch (req->op_code) { |
| 457 | case EAP_PAX_OP_STD_1: |
| 458 | resp = eap_pax_process_std_1(data, ret, reqData, flen, |
| 459 | respDataLen); |
| 460 | break; |
| 461 | case EAP_PAX_OP_STD_3: |
| 462 | resp = eap_pax_process_std_3(data, ret, reqData, flen, |
| 463 | respDataLen); |
| 464 | break; |
| 465 | default: |
| 466 | wpa_printf(MSG_DEBUG, "EAP-PAX: ignoring message with unknown " |
| 467 | "op_code %d", req->op_code); |
| 468 | ret->ignore = TRUE; |
| 469 | return NULL; |
| 470 | } |
| 471 | |
| 472 | if (ret->methodState == METHOD_DONE) { |
| 473 | ret->allowNotifications = FALSE; |
| 474 | } |
| 475 | |
| 476 | return resp; |
| 477 | } |
| 478 | |
| 479 | |
| 480 | static Boolean eap_pax_isKeyAvailable(struct eap_sm *sm, void *priv) |
| 481 | { |
| 482 | struct eap_pax_data *data = priv; |
| 483 | return data->state == PAX_DONE; |
| 484 | } |
| 485 | |
| 486 | |
| 487 | static u8 * eap_pax_getKey(struct eap_sm *sm, void *priv, size_t *len) |
| 488 | { |
| 489 | struct eap_pax_data *data = priv; |
| 490 | u8 *key; |
| 491 | |
| 492 | if (data->state != PAX_DONE) |
| 493 | return NULL; |
| 494 | |
| 495 | key = os_malloc(EAP_MSK_LEN); |
| 496 | if (key == NULL) |
| 497 | return NULL; |
| 498 | |
| 499 | *len = EAP_MSK_LEN; |
| 500 | eap_pax_kdf(data->mac_id, data->mk, EAP_PAX_MK_LEN, |
| 501 | "Master Session Key", data->rand.e, 2 * EAP_PAX_RAND_LEN, |
| 502 | EAP_MSK_LEN, key); |
| 503 | |
| 504 | return key; |
| 505 | } |
| 506 | |
| 507 | |
| 508 | static u8 * eap_pax_get_emsk(struct eap_sm *sm, void *priv, size_t *len) |
| 509 | { |
| 510 | struct eap_pax_data *data = priv; |
| 511 | u8 *key; |
| 512 | |
| 513 | if (data->state != PAX_DONE) |
| 514 | return NULL; |
| 515 | |
| 516 | key = os_malloc(EAP_EMSK_LEN); |
| 517 | if (key == NULL) |
| 518 | return NULL; |
| 519 | |
| 520 | *len = EAP_EMSK_LEN; |
| 521 | eap_pax_kdf(data->mac_id, data->mk, EAP_PAX_MK_LEN, |
| 522 | "Extended Master Session Key", |
| 523 | data->rand.e, 2 * EAP_PAX_RAND_LEN, |
| 524 | EAP_EMSK_LEN, key); |
| 525 | |
| 526 | return key; |
| 527 | } |
| 528 | |
| 529 | |
| 530 | int eap_peer_pax_register(void) |
| 531 | { |
| 532 | struct eap_method *eap; |
| 533 | int ret; |
| 534 | |
| 535 | eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION, |
| 536 | EAP_VENDOR_IETF, EAP_TYPE_PAX, "PAX"); |
| 537 | if (eap == NULL) |
| 538 | return -1; |
| 539 | |
| 540 | eap->init = eap_pax_init; |
| 541 | eap->deinit = eap_pax_deinit; |
| 542 | eap->process = eap_pax_process; |
| 543 | eap->isKeyAvailable = eap_pax_isKeyAvailable; |
| 544 | eap->getKey = eap_pax_getKey; |
| 545 | eap->get_emsk = eap_pax_get_emsk; |
| 546 | |
| 547 | ret = eap_peer_method_register(eap); |
| 548 | if (ret) |
| 549 | eap_peer_method_free(eap); |
| 550 | return ret; |
| 551 | } |