static u8 * eap_pax_build_std_3(struct eap_sm *sm, struct eap_pax_data *data, int id, size_t *reqDataLen) { struct eap_pax_hdr *req; u8 *pos; wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-3 (sending)"); *reqDataLen = sizeof(*req) + 2 + EAP_PAX_MAC_LEN + EAP_PAX_ICV_LEN; req = VM_MALLOC(*reqDataLen); if (req == NULL) { wpa_printf(MSG_ERROR, "EAP-PAX: Failed to allocate memory " "request"); data->state = FAILURE; return NULL; } req->code = EAP_CODE_REQUEST; req->identifier = id; req->length = htons(*reqDataLen); req->type = EAP_TYPE_PAX; req->op_code = EAP_PAX_OP_STD_3; req->flags = 0; req->mac_id = data->mac_id; req->dh_group_id = EAP_PAX_DH_GROUP_NONE; req->public_key_id = EAP_PAX_PUBLIC_KEY_NONE; pos = (u8 *) (req + 1); *pos++ = 0; *pos++ = EAP_PAX_MAC_LEN; eap_pax_mac(data->mac_id, data->ck, EAP_PAX_CK_LEN, data->rand.r.y, EAP_PAX_RAND_LEN, (u8 *) data->cid, data->cid_len, NULL, 0, pos); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: MAC_CK(B, CID)", pos, EAP_PAX_MAC_LEN); pos += EAP_PAX_MAC_LEN; /* Optional ADE could be added here, if needed */ eap_pax_mac(data->mac_id, data->ick, EAP_PAX_ICK_LEN, (u8 *) req, *reqDataLen - EAP_PAX_ICV_LEN, NULL, 0, NULL, 0, pos); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", pos, EAP_PAX_ICV_LEN); pos += EAP_PAX_ICV_LEN; return (u8 *) req; }
static struct wpabuf * eap_pax_build_std_3(struct eap_sm *sm, struct eap_pax_data *data, u8 id) { struct wpabuf *req; struct eap_pax_hdr *pax; u8 *pos; wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-3 (sending)"); req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PAX, sizeof(*pax) + 2 + EAP_PAX_MAC_LEN + EAP_PAX_ICV_LEN, EAP_CODE_REQUEST, id); if (req == NULL) { wpa_printf(MSG_ERROR, "EAP-PAX: Failed to allocate memory " "request"); data->state = FAILURE; return NULL; } pax = wpabuf_put(req, sizeof(*pax)); pax->op_code = EAP_PAX_OP_STD_3; pax->flags = 0; pax->mac_id = data->mac_id; pax->dh_group_id = EAP_PAX_DH_GROUP_NONE; pax->public_key_id = EAP_PAX_PUBLIC_KEY_NONE; wpabuf_put_be16(req, EAP_PAX_MAC_LEN); pos = wpabuf_put(req, EAP_PAX_MAC_LEN); eap_pax_mac(data->mac_id, data->ck, EAP_PAX_CK_LEN, data->rand.r.y, EAP_PAX_RAND_LEN, (u8 *) data->cid, data->cid_len, NULL, 0, pos); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: MAC_CK(B, CID)", pos, EAP_PAX_MAC_LEN); pos += EAP_PAX_MAC_LEN; /* Optional ADE could be added here, if needed */ pos = wpabuf_put(req, EAP_PAX_MAC_LEN); eap_pax_mac(data->mac_id, data->ick, EAP_PAX_ICK_LEN, wpabuf_mhead(req), wpabuf_len(req) - EAP_PAX_ICV_LEN, NULL, 0, NULL, 0, pos); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", pos, EAP_PAX_ICV_LEN); return req; }
static u8 * eap_pax_build_std_1(struct eap_sm *sm, struct eap_pax_data *data, int id, size_t *reqDataLen) { struct eap_pax_hdr *req; u8 *pos; wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-1 (sending)"); if (hostapd_get_rand(data->rand.r.x, EAP_PAX_RAND_LEN)) { wpa_printf(MSG_ERROR, "EAP-PAX: Failed to get random data"); data->state = FAILURE; return NULL; } *reqDataLen = sizeof(*req) + 2 + EAP_PAX_RAND_LEN + EAP_PAX_ICV_LEN; req = VM_MALLOC(*reqDataLen); if (req == NULL) { wpa_printf(MSG_ERROR, "EAP-PAX: Failed to allocate memory " "request"); data->state = FAILURE; return NULL; } req->code = EAP_CODE_REQUEST; req->identifier = id; req->length = htons(*reqDataLen); req->type = EAP_TYPE_PAX; req->op_code = EAP_PAX_OP_STD_1; req->flags = 0; req->mac_id = data->mac_id; req->dh_group_id = EAP_PAX_DH_GROUP_NONE; req->public_key_id = EAP_PAX_PUBLIC_KEY_NONE; pos = (u8 *) (req + 1); *pos++ = 0; *pos++ = EAP_PAX_RAND_LEN; memcpy(pos, data->rand.r.x, EAP_PAX_RAND_LEN); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: A = X (server rand)", pos, EAP_PAX_RAND_LEN); pos += EAP_PAX_RAND_LEN; eap_pax_mac(data->mac_id, (u8 *) "", 0, (u8 *) req, *reqDataLen - EAP_PAX_ICV_LEN, NULL, 0, NULL, 0, pos); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", pos, EAP_PAX_ICV_LEN); pos += EAP_PAX_ICV_LEN; return (u8 *) req; }
static struct wpabuf * eap_pax_build_std_1(struct eap_sm *sm, struct eap_pax_data *data, u8 id) { struct wpabuf *req; struct eap_pax_hdr *pax; u8 *pos; wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-1 (sending)"); if (random_get_bytes(data->rand.r.x, EAP_PAX_RAND_LEN)) { wpa_printf(MSG_ERROR, "EAP-PAX: Failed to get random data"); data->state = FAILURE; return NULL; } req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_PAX, sizeof(*pax) + 2 + EAP_PAX_RAND_LEN + EAP_PAX_ICV_LEN, EAP_CODE_REQUEST, id); if (req == NULL) { wpa_printf(MSG_ERROR, "EAP-PAX: Failed to allocate memory " "request"); data->state = FAILURE; return NULL; } pax = wpabuf_put(req, sizeof(*pax)); pax->op_code = EAP_PAX_OP_STD_1; pax->flags = 0; pax->mac_id = data->mac_id; pax->dh_group_id = EAP_PAX_DH_GROUP_NONE; pax->public_key_id = EAP_PAX_PUBLIC_KEY_NONE; wpabuf_put_be16(req, EAP_PAX_RAND_LEN); wpabuf_put_data(req, data->rand.r.x, EAP_PAX_RAND_LEN); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: A = X (server rand)", data->rand.r.x, EAP_PAX_RAND_LEN); pos = wpabuf_put(req, EAP_PAX_MAC_LEN); eap_pax_mac(data->mac_id, (u8 *) "", 0, wpabuf_mhead(req), wpabuf_len(req) - EAP_PAX_ICV_LEN, NULL, 0, NULL, 0, pos); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", pos, EAP_PAX_ICV_LEN); return req; }
static void eap_pax_process_std_2(struct eap_sm *sm, struct eap_pax_data *data, struct wpabuf *respData) { struct eap_pax_hdr *resp; u8 mac[EAP_PAX_MAC_LEN], icvbuf[EAP_PAX_ICV_LEN]; const u8 *pos; size_t len, left; int i; if (data->state != PAX_STD_1) return; wpa_printf(MSG_DEBUG, "EAP-PAX: Received PAX_STD-2"); pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_PAX, respData, &len); if (pos == NULL || len < sizeof(*resp) + EAP_PAX_ICV_LEN) return; resp = (struct eap_pax_hdr *) pos; pos = (u8 *) (resp + 1); left = len - sizeof(*resp); if (left < 2 + EAP_PAX_RAND_LEN || WPA_GET_BE16(pos) != EAP_PAX_RAND_LEN) { wpa_printf(MSG_INFO, "EAP-PAX: Too short PAX_STD-2 (B)"); return; } pos += 2; left -= 2; os_memcpy(data->rand.r.y, pos, EAP_PAX_RAND_LEN); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Y (client rand)", data->rand.r.y, EAP_PAX_RAND_LEN); pos += EAP_PAX_RAND_LEN; left -= EAP_PAX_RAND_LEN; if (left < 2 || (size_t) 2 + WPA_GET_BE16(pos) > left) { wpa_printf(MSG_INFO, "EAP-PAX: Too short PAX_STD-2 (CID)"); return; } data->cid_len = WPA_GET_BE16(pos); os_free(data->cid); data->cid = os_malloc(data->cid_len); if (data->cid == NULL) { wpa_printf(MSG_INFO, "EAP-PAX: Failed to allocate memory for " "CID"); return; } os_memcpy(data->cid, pos + 2, data->cid_len); pos += 2 + data->cid_len; left -= 2 + data->cid_len; wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-PAX: CID", (u8 *) data->cid, data->cid_len); if (left < 2 + EAP_PAX_MAC_LEN || WPA_GET_BE16(pos) != EAP_PAX_MAC_LEN) { wpa_printf(MSG_INFO, "EAP-PAX: Too short PAX_STD-2 (MAC_CK)"); return; } pos += 2; left -= 2; wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: MAC_CK(A, B, CID)", pos, EAP_PAX_MAC_LEN); if (eap_user_get(sm, (u8 *) data->cid, data->cid_len, 0) < 0) { wpa_hexdump_ascii(MSG_DEBUG, "EAP-PAX: unknown CID", (u8 *) data->cid, data->cid_len); data->state = FAILURE; return; } for (i = 0; i < EAP_MAX_METHODS && (sm->user->methods[i].vendor != EAP_VENDOR_IETF || sm->user->methods[i].method != EAP_TYPE_NONE); i++) { if (sm->user->methods[i].vendor == EAP_VENDOR_IETF && sm->user->methods[i].method == EAP_TYPE_PAX) break; } if (i >= EAP_MAX_METHODS || sm->user->methods[i].vendor != EAP_VENDOR_IETF || sm->user->methods[i].method != EAP_TYPE_PAX) { wpa_hexdump_ascii(MSG_DEBUG, "EAP-PAX: EAP-PAX not enabled for CID", (u8 *) data->cid, data->cid_len); data->state = FAILURE; return; } if (sm->user->password == NULL || sm->user->password_len != EAP_PAX_AK_LEN) { wpa_hexdump_ascii(MSG_DEBUG, "EAP-PAX: invalid password in " "user database for CID", (u8 *) data->cid, data->cid_len); data->state = FAILURE; return; } os_memcpy(data->ak, sm->user->password, EAP_PAX_AK_LEN); if (eap_pax_initial_key_derivation(data->mac_id, data->ak, data->rand.e, data->mk, data->ck, data->ick) < 0) { wpa_printf(MSG_INFO, "EAP-PAX: Failed to complete initial " "key derivation"); data->state = FAILURE; return; } data->keys_set = 1; eap_pax_mac(data->mac_id, data->ck, EAP_PAX_CK_LEN, data->rand.r.x, EAP_PAX_RAND_LEN, data->rand.r.y, EAP_PAX_RAND_LEN, (u8 *) data->cid, data->cid_len, mac); if (os_memcmp_const(mac, pos, EAP_PAX_MAC_LEN) != 0) { wpa_printf(MSG_INFO, "EAP-PAX: Invalid MAC_CK(A, B, CID) in " "PAX_STD-2"); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Expected MAC_CK(A, B, CID)", mac, EAP_PAX_MAC_LEN); data->state = FAILURE; return; } pos += EAP_PAX_MAC_LEN; left -= EAP_PAX_MAC_LEN; if (left < EAP_PAX_ICV_LEN) { wpa_printf(MSG_INFO, "EAP-PAX: Too short ICV (%lu) in " "PAX_STD-2", (unsigned long) left); return; } wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", pos, EAP_PAX_ICV_LEN); eap_pax_mac(data->mac_id, data->ick, EAP_PAX_ICK_LEN, wpabuf_head(respData), wpabuf_len(respData) - EAP_PAX_ICV_LEN, NULL, 0, NULL, 0, icvbuf); if (os_memcmp_const(icvbuf, pos, EAP_PAX_ICV_LEN) != 0) { wpa_printf(MSG_INFO, "EAP-PAX: Invalid ICV in PAX_STD-2"); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Expected ICV", icvbuf, EAP_PAX_ICV_LEN); return; } pos += EAP_PAX_ICV_LEN; left -= EAP_PAX_ICV_LEN; if (left > 0) { wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ignored extra payload", pos, left); } data->state = PAX_STD_3; }
static Boolean eap_pax_check(struct eap_sm *sm, void *priv, struct wpabuf *respData) { struct eap_pax_data *data = priv; struct eap_pax_hdr *resp; const u8 *pos; size_t len, mlen; u8 icvbuf[EAP_PAX_ICV_LEN], *icv; pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_PAX, respData, &len); if (pos == NULL || len < sizeof(*resp)) { wpa_printf(MSG_INFO, "EAP-PAX: Invalid frame"); return TRUE; } mlen = sizeof(struct eap_hdr) + 1 + len; resp = (struct eap_pax_hdr *) pos; wpa_printf(MSG_DEBUG, "EAP-PAX: received frame: op_code 0x%x " "flags 0x%x mac_id 0x%x dh_group_id 0x%x " "public_key_id 0x%x", resp->op_code, resp->flags, resp->mac_id, resp->dh_group_id, resp->public_key_id); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: received payload", (u8 *) (resp + 1), len - sizeof(*resp) - EAP_PAX_ICV_LEN); if (data->state == PAX_STD_1 && resp->op_code != EAP_PAX_OP_STD_2) { wpa_printf(MSG_DEBUG, "EAP-PAX: Expected PAX_STD-2 - " "ignore op %d", resp->op_code); return TRUE; } if (data->state == PAX_STD_3 && resp->op_code != EAP_PAX_OP_ACK) { wpa_printf(MSG_DEBUG, "EAP-PAX: Expected PAX-ACK - " "ignore op %d", resp->op_code); return TRUE; } if (resp->op_code != EAP_PAX_OP_STD_2 && resp->op_code != EAP_PAX_OP_ACK) { wpa_printf(MSG_DEBUG, "EAP-PAX: Unknown op_code 0x%x", resp->op_code); } if (data->mac_id != resp->mac_id) { wpa_printf(MSG_DEBUG, "EAP-PAX: Expected MAC ID 0x%x, " "received 0x%x", data->mac_id, resp->mac_id); return TRUE; } if (resp->dh_group_id != EAP_PAX_DH_GROUP_NONE) { wpa_printf(MSG_INFO, "EAP-PAX: Expected DH Group ID 0x%x, " "received 0x%x", EAP_PAX_DH_GROUP_NONE, resp->dh_group_id); return TRUE; } if (resp->public_key_id != EAP_PAX_PUBLIC_KEY_NONE) { wpa_printf(MSG_INFO, "EAP-PAX: Expected Public Key ID 0x%x, " "received 0x%x", EAP_PAX_PUBLIC_KEY_NONE, resp->public_key_id); return TRUE; } if (resp->flags & EAP_PAX_FLAGS_MF) { /* TODO: add support for reassembling fragments */ wpa_printf(MSG_INFO, "EAP-PAX: fragmentation not supported"); return TRUE; } if (resp->flags & EAP_PAX_FLAGS_CE) { wpa_printf(MSG_INFO, "EAP-PAX: Unexpected CE flag"); return TRUE; } if (data->keys_set) { if (len - sizeof(*resp) < EAP_PAX_ICV_LEN) { wpa_printf(MSG_INFO, "EAP-PAX: No ICV in the packet"); return TRUE; } icv = wpabuf_mhead_u8(respData) + mlen - EAP_PAX_ICV_LEN; wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", icv, EAP_PAX_ICV_LEN); eap_pax_mac(data->mac_id, data->ick, EAP_PAX_ICK_LEN, wpabuf_mhead(respData), wpabuf_len(respData) - EAP_PAX_ICV_LEN, NULL, 0, NULL, 0, icvbuf); if (os_memcmp_const(icvbuf, icv, EAP_PAX_ICV_LEN) != 0) { wpa_printf(MSG_INFO, "EAP-PAX: Invalid ICV"); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Expected ICV", icvbuf, EAP_PAX_ICV_LEN); return TRUE; } } return FALSE; }
static struct wpabuf * eap_pax_process(struct eap_sm *sm, void *priv, struct eap_method_ret *ret, const struct wpabuf *reqData) { struct eap_pax_data *data = priv; const struct eap_pax_hdr *req; struct wpabuf *resp; u8 icvbuf[EAP_PAX_ICV_LEN], id; const u8 *icv, *pos; size_t len; u16 flen, mlen; pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_PAX, reqData, &len); if (pos == NULL || len < sizeof(*req) + EAP_PAX_ICV_LEN) { ret->ignore = TRUE; return NULL; } id = eap_get_id(reqData); req = (const struct eap_pax_hdr *) pos; flen = len - EAP_PAX_ICV_LEN; mlen = wpabuf_len(reqData) - EAP_PAX_ICV_LEN; wpa_printf(MSG_DEBUG, "EAP-PAX: received frame: op_code 0x%x " "flags 0x%x mac_id 0x%x dh_group_id 0x%x " "public_key_id 0x%x", req->op_code, req->flags, req->mac_id, req->dh_group_id, req->public_key_id); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: received payload", pos, len - EAP_PAX_ICV_LEN); if (data->state != PAX_INIT && data->mac_id != req->mac_id) { wpa_printf(MSG_INFO, "EAP-PAX: MAC ID changed during " "authentication (was 0x%d, is 0x%d)", data->mac_id, req->mac_id); ret->ignore = TRUE; return NULL; } if (data->state != PAX_INIT && data->dh_group_id != req->dh_group_id) { wpa_printf(MSG_INFO, "EAP-PAX: DH Group ID changed during " "authentication (was 0x%d, is 0x%d)", data->dh_group_id, req->dh_group_id); ret->ignore = TRUE; return NULL; } if (data->state != PAX_INIT && data->public_key_id != req->public_key_id) { wpa_printf(MSG_INFO, "EAP-PAX: Public Key ID changed during " "authentication (was 0x%d, is 0x%d)", data->public_key_id, req->public_key_id); ret->ignore = TRUE; return NULL; } /* TODO: add support EAP_PAX_HMAC_SHA256_128 */ if (req->mac_id != EAP_PAX_MAC_HMAC_SHA1_128) { wpa_printf(MSG_INFO, "EAP-PAX: Unsupported MAC ID 0x%x", req->mac_id); ret->ignore = TRUE; return NULL; } if (req->dh_group_id != EAP_PAX_DH_GROUP_NONE) { wpa_printf(MSG_INFO, "EAP-PAX: Unsupported DH Group ID 0x%x", req->dh_group_id); ret->ignore = TRUE; return NULL; } if (req->public_key_id != EAP_PAX_PUBLIC_KEY_NONE) { wpa_printf(MSG_INFO, "EAP-PAX: Unsupported Public Key ID 0x%x", req->public_key_id); ret->ignore = TRUE; return NULL; } if (req->flags & EAP_PAX_FLAGS_MF) { /* TODO: add support for reassembling fragments */ wpa_printf(MSG_INFO, "EAP-PAX: fragmentation not supported - " "ignored packet"); ret->ignore = TRUE; return NULL; } icv = pos + len - EAP_PAX_ICV_LEN; wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", icv, EAP_PAX_ICV_LEN); if (req->op_code == EAP_PAX_OP_STD_1) { eap_pax_mac(req->mac_id, (u8 *) "", 0, wpabuf_head(reqData), mlen, NULL, 0, NULL, 0, icvbuf); } else { eap_pax_mac(req->mac_id, data->ick, EAP_PAX_ICK_LEN, wpabuf_head(reqData), mlen, NULL, 0, NULL, 0, icvbuf); } if (os_memcmp_const(icv, icvbuf, EAP_PAX_ICV_LEN) != 0) { wpa_printf(MSG_DEBUG, "EAP-PAX: invalid ICV - ignoring the " "message"); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: expected ICV", icvbuf, EAP_PAX_ICV_LEN); ret->ignore = TRUE; return NULL; } ret->ignore = FALSE; ret->methodState = METHOD_MAY_CONT; ret->decision = DECISION_FAIL; ret->allowNotifications = TRUE; switch (req->op_code) { case EAP_PAX_OP_STD_1: resp = eap_pax_process_std_1(data, ret, id, req, flen); break; case EAP_PAX_OP_STD_3: resp = eap_pax_process_std_3(data, ret, id, req, flen); break; default: wpa_printf(MSG_DEBUG, "EAP-PAX: ignoring message with unknown " "op_code %d", req->op_code); ret->ignore = TRUE; return NULL; } if (ret->methodState == METHOD_DONE) { ret->allowNotifications = FALSE; } return resp; }
static struct wpabuf * eap_pax_process_std_3(struct eap_pax_data *data, struct eap_method_ret *ret, u8 id, const struct eap_pax_hdr *req, size_t req_plen) { struct wpabuf *resp; u8 *rpos, mac[EAP_PAX_MAC_LEN]; const u8 *pos; size_t left; wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-3 (received)"); if (data->state != PAX_STD_2_SENT) { wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-3 received in " "unexpected state (%d) - ignored", data->state); ret->ignore = TRUE; return NULL; } if (req->flags & EAP_PAX_FLAGS_CE) { wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-3 with CE flag set - " "ignored"); ret->ignore = TRUE; return NULL; } left = req_plen - sizeof(*req); if (left < 2 + EAP_PAX_MAC_LEN) { wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-3 with too short " "payload"); ret->ignore = TRUE; return NULL; } pos = (const u8 *) (req + 1); if (WPA_GET_BE16(pos) != EAP_PAX_MAC_LEN) { wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-3 with incorrect " "MAC_CK length %d (expected %d)", WPA_GET_BE16(pos), EAP_PAX_MAC_LEN); ret->ignore = TRUE; return NULL; } pos += 2; left -= 2; wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: MAC_CK(B, CID)", pos, EAP_PAX_MAC_LEN); eap_pax_mac(data->mac_id, data->ck, EAP_PAX_CK_LEN, data->rand.r.y, EAP_PAX_RAND_LEN, (u8 *) data->cid, data->cid_len, NULL, 0, mac); if (os_memcmp_const(pos, mac, EAP_PAX_MAC_LEN) != 0) { wpa_printf(MSG_INFO, "EAP-PAX: Invalid MAC_CK(B, CID) " "received"); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: expected MAC_CK(B, CID)", mac, EAP_PAX_MAC_LEN); ret->methodState = METHOD_DONE; ret->decision = DECISION_FAIL; return NULL; } pos += EAP_PAX_MAC_LEN; left -= EAP_PAX_MAC_LEN; if (left > 0) { wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ignored extra payload", pos, left); } wpa_printf(MSG_DEBUG, "EAP-PAX: PAX-ACK (sending)"); resp = eap_pax_alloc_resp(req, id, EAP_PAX_OP_ACK, EAP_PAX_ICV_LEN); if (resp == NULL) return NULL; /* Optional ADE could be added here, if needed */ rpos = wpabuf_put(resp, EAP_PAX_ICV_LEN); eap_pax_mac(data->mac_id, data->ick, EAP_PAX_ICK_LEN, wpabuf_head(resp), wpabuf_len(resp) - EAP_PAX_ICV_LEN, NULL, 0, NULL, 0, rpos); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", rpos, EAP_PAX_ICV_LEN); data->state = PAX_DONE; ret->methodState = METHOD_DONE; ret->decision = DECISION_UNCOND_SUCC; ret->allowNotifications = FALSE; return resp; }
static struct wpabuf * eap_pax_process_std_1(struct eap_pax_data *data, struct eap_method_ret *ret, u8 id, const struct eap_pax_hdr *req, size_t req_plen) { struct wpabuf *resp; const u8 *pos; u8 *rpos; size_t left, plen; wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-1 (received)"); if (data->state != PAX_INIT) { wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-1 received in " "unexpected state (%d) - ignored", data->state); ret->ignore = TRUE; return NULL; } if (req->flags & EAP_PAX_FLAGS_CE) { wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-1 with CE flag set - " "ignored"); ret->ignore = TRUE; return NULL; } left = req_plen - sizeof(*req); if (left < 2 + EAP_PAX_RAND_LEN) { wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-1 with too short " "payload"); ret->ignore = TRUE; return NULL; } pos = (const u8 *) (req + 1); if (WPA_GET_BE16(pos) != EAP_PAX_RAND_LEN) { wpa_printf(MSG_INFO, "EAP-PAX: PAX_STD-1 with incorrect A " "length %d (expected %d)", WPA_GET_BE16(pos), EAP_PAX_RAND_LEN); ret->ignore = TRUE; return NULL; } pos += 2; left -= 2; os_memcpy(data->rand.r.x, pos, EAP_PAX_RAND_LEN); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: X (server rand)", data->rand.r.x, EAP_PAX_RAND_LEN); pos += EAP_PAX_RAND_LEN; left -= EAP_PAX_RAND_LEN; if (left > 0) { wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ignored extra payload", pos, left); } if (random_get_bytes(data->rand.r.y, EAP_PAX_RAND_LEN)) { wpa_printf(MSG_ERROR, "EAP-PAX: Failed to get random data"); ret->ignore = TRUE; return NULL; } wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Y (client rand)", data->rand.r.y, EAP_PAX_RAND_LEN); if (eap_pax_initial_key_derivation(req->mac_id, data->ak, data->rand.e, data->mk, data->ck, data->ick, data->mid) < 0) { ret->ignore = TRUE; return NULL; } wpa_printf(MSG_DEBUG, "EAP-PAX: PAX_STD-2 (sending)"); plen = 2 + EAP_PAX_RAND_LEN + 2 + data->cid_len + 2 + EAP_PAX_MAC_LEN + EAP_PAX_ICV_LEN; resp = eap_pax_alloc_resp(req, id, EAP_PAX_OP_STD_2, plen); if (resp == NULL) return NULL; wpabuf_put_be16(resp, EAP_PAX_RAND_LEN); wpabuf_put_data(resp, data->rand.r.y, EAP_PAX_RAND_LEN); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: B = Y (client rand)", data->rand.r.y, EAP_PAX_RAND_LEN); wpabuf_put_be16(resp, data->cid_len); wpabuf_put_data(resp, data->cid, data->cid_len); wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-PAX: CID", (u8 *) data->cid, data->cid_len); wpabuf_put_be16(resp, EAP_PAX_MAC_LEN); rpos = wpabuf_put(resp, EAP_PAX_MAC_LEN); eap_pax_mac(req->mac_id, data->ck, EAP_PAX_CK_LEN, data->rand.r.x, EAP_PAX_RAND_LEN, data->rand.r.y, EAP_PAX_RAND_LEN, (u8 *) data->cid, data->cid_len, rpos); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: MAC_CK(A, B, CID)", rpos, EAP_PAX_MAC_LEN); /* Optional ADE could be added here, if needed */ rpos = wpabuf_put(resp, EAP_PAX_ICV_LEN); eap_pax_mac(req->mac_id, data->ick, EAP_PAX_ICK_LEN, wpabuf_head(resp), wpabuf_len(resp) - EAP_PAX_ICV_LEN, NULL, 0, NULL, 0, rpos); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", rpos, EAP_PAX_ICV_LEN); data->state = PAX_STD_2_SENT; data->mac_id = req->mac_id; data->dh_group_id = req->dh_group_id; data->public_key_id = req->public_key_id; return resp; }
static Boolean eap_pax_check(struct eap_sm *sm, void *priv, u8 *respData, size_t respDataLen) { struct eap_pax_data *data = priv; struct eap_pax_hdr *resp; size_t len; u8 icvbuf[EAP_PAX_ICV_LEN], *icv; resp = (struct eap_pax_hdr *) respData; if (respDataLen < sizeof(*resp) || resp->type != EAP_TYPE_PAX || (len = ntohs(resp->length)) > respDataLen || len < sizeof(*resp) + EAP_PAX_ICV_LEN) { wpa_printf(MSG_INFO, "EAP-PAX: Invalid frame"); return TRUE; } wpa_printf(MSG_DEBUG, "EAP-PAX: received frame: op_code 0x%x " "flags 0x%x mac_id 0x%x dh_group_id 0x%x " "public_key_id 0x%x", resp->op_code, resp->flags, resp->mac_id, resp->dh_group_id, resp->public_key_id); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: received payload", (u8 *) (resp + 1), len - sizeof(*resp) - EAP_PAX_ICV_LEN); if (data->state == PAX_STD_1 && resp->op_code != EAP_PAX_OP_STD_2) { wpa_printf(MSG_DEBUG, "EAP-PAX: Expected PAX_STD-2 - " "ignore op %d", resp->op_code); return TRUE; } if (data->state == PAX_STD_3 && resp->op_code != EAP_PAX_OP_ACK) { wpa_printf(MSG_DEBUG, "EAP-PAX: Expected PAX-ACK - " "ignore op %d", resp->op_code); return TRUE; } if (resp->op_code != EAP_PAX_OP_STD_2 && resp->op_code != EAP_PAX_OP_ACK) { wpa_printf(MSG_DEBUG, "EAP-PAX: Unknown op_code 0x%x", resp->op_code); } if (data->mac_id != resp->mac_id) { wpa_printf(MSG_DEBUG, "EAP-PAX: Expected MAC ID 0x%x, " "received 0x%x", data->mac_id, resp->mac_id); return TRUE; } if (resp->dh_group_id != EAP_PAX_DH_GROUP_NONE) { wpa_printf(MSG_INFO, "EAP-PAX: Expected DH Group ID 0x%x, " "received 0x%x", EAP_PAX_DH_GROUP_NONE, resp->dh_group_id); return TRUE; } if (resp->public_key_id != EAP_PAX_PUBLIC_KEY_NONE) { wpa_printf(MSG_INFO, "EAP-PAX: Expected Public Key ID 0x%x, " "received 0x%x", EAP_PAX_PUBLIC_KEY_NONE, resp->public_key_id); return TRUE; } if (resp->flags & EAP_PAX_FLAGS_MF) { /* TODO: add support for reassembling fragments */ wpa_printf(MSG_INFO, "EAP-PAX: fragmentation not supported"); return TRUE; } if (resp->flags & EAP_PAX_FLAGS_CE) { wpa_printf(MSG_INFO, "EAP-PAX: Unexpected CE flag"); return TRUE; } if (data->keys_set) { if (len - sizeof(*resp) < EAP_PAX_ICV_LEN) { wpa_printf(MSG_INFO, "EAP-PAX: No ICV in the packet"); return TRUE; } icv = respData + len - EAP_PAX_ICV_LEN; wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: ICV", icv, EAP_PAX_ICV_LEN); eap_pax_mac(data->mac_id, data->ick, EAP_PAX_ICK_LEN, respData, len - EAP_PAX_ICV_LEN, NULL, 0, NULL, 0, icvbuf); if (memcmp(icvbuf, icv, EAP_PAX_ICV_LEN) != 0) { wpa_printf(MSG_INFO, "EAP-PAX: Invalid ICV"); wpa_hexdump(MSG_MSGDUMP, "EAP-PAX: Expected ICV", icvbuf, EAP_PAX_ICV_LEN); return TRUE; } } return FALSE; }