blob: fd51635158ac5c646bf8772e0d83200972e9c595 [file] [log] [blame]
/*
* Wi-Fi Protected Setup - attribute parsing
* Copyright (c) 2008, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
#include "wps_defs.h"
#include "wps_attr_parse.h"
#ifndef CONFIG_WPS_STRICT
#define WPS_WORKAROUNDS
#endif /* CONFIG_WPS_STRICT */
static int wps_set_vendor_ext_wfa_subelem(struct wps_parse_attr *attr,
u8 id, u8 len, const u8 *pos)
{
wpa_printf(MSG_EXCESSIVE, "WPS: WFA subelement id=%u len=%u",
id, len);
switch (id) {
case WFA_ELEM_VERSION2:
if (len != 1) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Version2 length "
"%u", len);
return -1;
}
attr->version2 = pos;
break;
case WFA_ELEM_AUTHORIZEDMACS:
attr->authorized_macs = pos;
attr->authorized_macs_len = len;
break;
case WFA_ELEM_NETWORK_KEY_SHAREABLE:
if (len != 1) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Network Key "
"Shareable length %u", len);
return -1;
}
attr->network_key_shareable = pos;
break;
case WFA_ELEM_REQUEST_TO_ENROLL:
if (len != 1) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Request to Enroll "
"length %u", len);
return -1;
}
attr->request_to_enroll = pos;
break;
case WFA_ELEM_SETTINGS_DELAY_TIME:
if (len != 1) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Settings Delay "
"Time length %u", len);
return -1;
}
attr->settings_delay_time = pos;
break;
case WFA_ELEM_REGISTRAR_CONFIGURATION_METHODS:
if (len != 2) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Registrar Configuration Methods length %u",
len);
return -1;
}
attr->registrar_configuration_methods = pos;
break;
case WFA_ELEM_MULTI_AP:
if (len != 1) {
wpa_printf(MSG_DEBUG,
"WPS: Invalid Multi-AP Extension length %u",
len);
return -1;
}
attr->multi_ap_ext = *pos;
wpa_printf(MSG_DEBUG, "WPS: Multi-AP Extension 0x%02x",
attr->multi_ap_ext);
break;
default:
wpa_printf(MSG_MSGDUMP, "WPS: Skipped unknown WFA Vendor "
"Extension subelement %u", id);
break;
}
return 0;
}
static int wps_parse_vendor_ext_wfa(struct wps_parse_attr *attr, const u8 *pos,
u16 len)
{
const u8 *end = pos + len;
u8 id, elen;
while (end - pos >= 2) {
id = *pos++;
elen = *pos++;
if (elen > end - pos)
break;
if (wps_set_vendor_ext_wfa_subelem(attr, id, elen, pos) < 0)
return -1;
pos += elen;
}
return 0;
}
static int wps_parse_vendor_ext(struct wps_parse_attr *attr, const u8 *pos,
u16 len)
{
u32 vendor_id;
if (len < 3) {
wpa_printf(MSG_DEBUG, "WPS: Skip invalid Vendor Extension");
return 0;
}
vendor_id = WPA_GET_BE24(pos);
switch (vendor_id) {
case WPS_VENDOR_ID_WFA:
return wps_parse_vendor_ext_wfa(attr, pos + 3, len - 3);
}
/* Handle unknown vendor extensions */
wpa_printf(MSG_MSGDUMP, "WPS: Unknown Vendor Extension (Vendor ID %u)",
vendor_id);
if (len > WPS_MAX_VENDOR_EXT_LEN) {
wpa_printf(MSG_DEBUG, "WPS: Too long Vendor Extension (%u)",
len);
return -1;
}
if (attr->num_vendor_ext >= MAX_WPS_PARSE_VENDOR_EXT) {
wpa_printf(MSG_DEBUG, "WPS: Skipped Vendor Extension "
"attribute (max %d vendor extensions)",
MAX_WPS_PARSE_VENDOR_EXT);
return -1;
}
attr->vendor_ext[attr->num_vendor_ext] = pos;
attr->vendor_ext_len[attr->num_vendor_ext] = len;
attr->num_vendor_ext++;
return 0;
}
static int wps_set_attr(struct wps_parse_attr *attr, u16 type,
const u8 *pos, u16 len)
{
switch (type) {
case ATTR_VERSION:
if (len != 1) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Version length %u",
len);
return -1;
}
attr->version = pos;
break;
case ATTR_MSG_TYPE:
if (len != 1) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Message Type "
"length %u", len);
return -1;
}
attr->msg_type = pos;
break;
case ATTR_ENROLLEE_NONCE:
if (len != WPS_NONCE_LEN) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Enrollee Nonce "
"length %u", len);
return -1;
}
attr->enrollee_nonce = pos;
break;
case ATTR_REGISTRAR_NONCE:
if (len != WPS_NONCE_LEN) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Registrar Nonce "
"length %u", len);
return -1;
}
attr->registrar_nonce = pos;
break;
case ATTR_UUID_E:
if (len != WPS_UUID_LEN) {
wpa_printf(MSG_DEBUG, "WPS: Invalid UUID-E length %u",
len);
return -1;
}
attr->uuid_e = pos;
break;
case ATTR_UUID_R:
if (len != WPS_UUID_LEN) {
wpa_printf(MSG_DEBUG, "WPS: Invalid UUID-R length %u",
len);
return -1;
}
attr->uuid_r = pos;
break;
case ATTR_AUTH_TYPE_FLAGS:
if (len != 2) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Authentication "
"Type Flags length %u", len);
return -1;
}
attr->auth_type_flags = pos;
break;
case ATTR_ENCR_TYPE_FLAGS:
if (len != 2) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Encryption Type "
"Flags length %u", len);
return -1;
}
attr->encr_type_flags = pos;
break;
case ATTR_CONN_TYPE_FLAGS:
if (len != 1) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Connection Type "
"Flags length %u", len);
return -1;
}
attr->conn_type_flags = pos;
break;
case ATTR_CONFIG_METHODS:
if (len != 2) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Config Methods "
"length %u", len);
return -1;
}
attr->config_methods = pos;
break;
case ATTR_SELECTED_REGISTRAR_CONFIG_METHODS:
if (len != 2) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Selected "
"Registrar Config Methods length %u", len);
return -1;
}
attr->sel_reg_config_methods = pos;
break;
case ATTR_PRIMARY_DEV_TYPE:
if (len != WPS_DEV_TYPE_LEN) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Primary Device "
"Type length %u", len);
return -1;
}
attr->primary_dev_type = pos;
break;
case ATTR_RF_BANDS:
if (len != 1) {
wpa_printf(MSG_DEBUG, "WPS: Invalid RF Bands length "
"%u", len);
return -1;
}
attr->rf_bands = pos;
break;
case ATTR_ASSOC_STATE:
if (len != 2) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Association State "
"length %u", len);
return -1;
}
attr->assoc_state = pos;
break;
case ATTR_CONFIG_ERROR:
if (len != 2) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Configuration "
"Error length %u", len);
return -1;
}
attr->config_error = pos;
break;
case ATTR_DEV_PASSWORD_ID:
if (len != 2) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Device Password "
"ID length %u", len);
return -1;
}
attr->dev_password_id = pos;
break;
case ATTR_OOB_DEVICE_PASSWORD:
if (len < WPS_OOB_PUBKEY_HASH_LEN + 2 ||
len > WPS_OOB_PUBKEY_HASH_LEN + 2 +
WPS_OOB_DEVICE_PASSWORD_LEN ||
(len < WPS_OOB_PUBKEY_HASH_LEN + 2 +
WPS_OOB_DEVICE_PASSWORD_MIN_LEN &&
WPA_GET_BE16(pos + WPS_OOB_PUBKEY_HASH_LEN) !=
DEV_PW_NFC_CONNECTION_HANDOVER)) {
wpa_printf(MSG_DEBUG, "WPS: Invalid OOB Device "
"Password length %u", len);
return -1;
}
attr->oob_dev_password = pos;
attr->oob_dev_password_len = len;
break;
case ATTR_OS_VERSION:
if (len != 4) {
wpa_printf(MSG_DEBUG, "WPS: Invalid OS Version length "
"%u", len);
return -1;
}
attr->os_version = pos;
break;
case ATTR_WPS_STATE:
if (len != 1) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Wi-Fi Protected "
"Setup State length %u", len);
return -1;
}
attr->wps_state = pos;
break;
case ATTR_AUTHENTICATOR:
if (len != WPS_AUTHENTICATOR_LEN) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Authenticator "
"length %u", len);
return -1;
}
attr->authenticator = pos;
break;
case ATTR_R_HASH1:
if (len != WPS_HASH_LEN) {
wpa_printf(MSG_DEBUG, "WPS: Invalid R-Hash1 length %u",
len);
return -1;
}
attr->r_hash1 = pos;
break;
case ATTR_R_HASH2:
if (len != WPS_HASH_LEN) {
wpa_printf(MSG_DEBUG, "WPS: Invalid R-Hash2 length %u",
len);
return -1;
}
attr->r_hash2 = pos;
break;
case ATTR_E_HASH1:
if (len != WPS_HASH_LEN) {
wpa_printf(MSG_DEBUG, "WPS: Invalid E-Hash1 length %u",
len);
return -1;
}
attr->e_hash1 = pos;
break;
case ATTR_E_HASH2:
if (len != WPS_HASH_LEN) {
wpa_printf(MSG_DEBUG, "WPS: Invalid E-Hash2 length %u",
len);
return -1;
}
attr->e_hash2 = pos;
break;
case ATTR_R_SNONCE1:
if (len != WPS_SECRET_NONCE_LEN) {
wpa_printf(MSG_DEBUG, "WPS: Invalid R-SNonce1 length "
"%u", len);
return -1;
}
attr->r_snonce1 = pos;
break;
case ATTR_R_SNONCE2:
if (len != WPS_SECRET_NONCE_LEN) {
wpa_printf(MSG_DEBUG, "WPS: Invalid R-SNonce2 length "
"%u", len);
return -1;
}
attr->r_snonce2 = pos;
break;
case ATTR_E_SNONCE1:
if (len != WPS_SECRET_NONCE_LEN) {
wpa_printf(MSG_DEBUG, "WPS: Invalid E-SNonce1 length "
"%u", len);
return -1;
}
attr->e_snonce1 = pos;
break;
case ATTR_E_SNONCE2:
if (len != WPS_SECRET_NONCE_LEN) {
wpa_printf(MSG_DEBUG, "WPS: Invalid E-SNonce2 length "
"%u", len);
return -1;
}
attr->e_snonce2 = pos;
break;
case ATTR_KEY_WRAP_AUTH:
if (len != WPS_KWA_LEN) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Key Wrap "
"Authenticator length %u", len);
return -1;
}
attr->key_wrap_auth = pos;
break;
case ATTR_AUTH_TYPE:
if (len != 2) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Authentication "
"Type length %u", len);
return -1;
}
attr->auth_type = pos;
break;
case ATTR_ENCR_TYPE:
if (len != 2) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Encryption "
"Type length %u", len);
return -1;
}
attr->encr_type = pos;
break;
case ATTR_NETWORK_INDEX:
if (len != 1) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Network Index "
"length %u", len);
return -1;
}
attr->network_idx = pos;
break;
case ATTR_NETWORK_KEY_INDEX:
if (len != 1) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Network Key Index "
"length %u", len);
return -1;
}
attr->network_key_idx = pos;
break;
case ATTR_MAC_ADDR:
if (len != ETH_ALEN) {
wpa_printf(MSG_DEBUG, "WPS: Invalid MAC Address "
"length %u", len);
return -1;
}
attr->mac_addr = pos;
break;
case ATTR_SELECTED_REGISTRAR:
if (len != 1) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Selected Registrar"
" length %u", len);
return -1;
}
attr->selected_registrar = pos;
break;
case ATTR_REQUEST_TYPE:
if (len != 1) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Request Type "
"length %u", len);
return -1;
}
attr->request_type = pos;
break;
case ATTR_RESPONSE_TYPE:
if (len != 1) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Response Type "
"length %u", len);
return -1;
}
attr->response_type = pos;
break;
case ATTR_MANUFACTURER:
attr->manufacturer = pos;
if (len > WPS_MANUFACTURER_MAX_LEN)
attr->manufacturer_len = WPS_MANUFACTURER_MAX_LEN;
else
attr->manufacturer_len = len;
break;
case ATTR_MODEL_NAME:
attr->model_name = pos;
if (len > WPS_MODEL_NAME_MAX_LEN)
attr->model_name_len = WPS_MODEL_NAME_MAX_LEN;
else
attr->model_name_len = len;
break;
case ATTR_MODEL_NUMBER:
attr->model_number = pos;
if (len > WPS_MODEL_NUMBER_MAX_LEN)
attr->model_number_len = WPS_MODEL_NUMBER_MAX_LEN;
else
attr->model_number_len = len;
break;
case ATTR_SERIAL_NUMBER:
attr->serial_number = pos;
if (len > WPS_SERIAL_NUMBER_MAX_LEN)
attr->serial_number_len = WPS_SERIAL_NUMBER_MAX_LEN;
else
attr->serial_number_len = len;
break;
case ATTR_DEV_NAME:
if (len > WPS_DEV_NAME_MAX_LEN) {
wpa_printf(MSG_DEBUG,
"WPS: Ignore too long Device Name (len=%u)",
len);
break;
}
attr->dev_name = pos;
attr->dev_name_len = len;
break;
case ATTR_PUBLIC_KEY:
/*
* The Public Key attribute is supposed to be exactly 192 bytes
* in length. Allow couple of bytes shorter one to try to
* interoperate with implementations that do not use proper
* zero-padding.
*/
if (len < 190 || len > 192) {
wpa_printf(MSG_DEBUG,
"WPS: Ignore Public Key with unexpected length %u",
len);
break;
}
attr->public_key = pos;
attr->public_key_len = len;
break;
case ATTR_ENCR_SETTINGS:
attr->encr_settings = pos;
attr->encr_settings_len = len;
break;
case ATTR_CRED:
if (attr->num_cred >= MAX_CRED_COUNT) {
wpa_printf(MSG_DEBUG, "WPS: Skipped Credential "
"attribute (max %d credentials)",
MAX_CRED_COUNT);
break;
}
attr->cred[attr->num_cred] = pos;
attr->cred_len[attr->num_cred] = len;
attr->num_cred++;
break;
case ATTR_SSID:
if (len > SSID_MAX_LEN) {
wpa_printf(MSG_DEBUG,
"WPS: Ignore too long SSID (len=%u)", len);
break;
}
attr->ssid = pos;
attr->ssid_len = len;
break;
case ATTR_NETWORK_KEY:
attr->network_key = pos;
attr->network_key_len = len;
break;
case ATTR_AP_SETUP_LOCKED:
if (len != 1) {
wpa_printf(MSG_DEBUG, "WPS: Invalid AP Setup Locked "
"length %u", len);
return -1;
}
attr->ap_setup_locked = pos;
break;
case ATTR_REQUESTED_DEV_TYPE:
if (len != WPS_DEV_TYPE_LEN) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Requested Device "
"Type length %u", len);
return -1;
}
if (attr->num_req_dev_type >= MAX_REQ_DEV_TYPE_COUNT) {
wpa_printf(MSG_DEBUG, "WPS: Skipped Requested Device "
"Type attribute (max %u types)",
MAX_REQ_DEV_TYPE_COUNT);
break;
}
attr->req_dev_type[attr->num_req_dev_type] = pos;
attr->num_req_dev_type++;
break;
case ATTR_SECONDARY_DEV_TYPE_LIST:
if (len > WPS_SEC_DEV_TYPE_MAX_LEN ||
(len % WPS_DEV_TYPE_LEN) > 0) {
wpa_printf(MSG_DEBUG, "WPS: Invalid Secondary Device "
"Type length %u", len);
return -1;
}
attr->sec_dev_type_list = pos;
attr->sec_dev_type_list_len = len;
break;
case ATTR_VENDOR_EXT:
if (wps_parse_vendor_ext(attr, pos, len) < 0)
return -1;
break;
case ATTR_AP_CHANNEL:
if (len != 2) {
wpa_printf(MSG_DEBUG, "WPS: Invalid AP Channel "
"length %u", len);
return -1;
}
attr->ap_channel = pos;
break;
default:
wpa_printf(MSG_DEBUG, "WPS: Unsupported attribute type 0x%x "
"len=%u", type, len);
break;
}
return 0;
}
int wps_parse_msg(const struct wpabuf *msg, struct wps_parse_attr *attr)
{
const u8 *pos, *end;
u16 type, len;
#ifdef WPS_WORKAROUNDS
u16 prev_type = 0;
#endif /* WPS_WORKAROUNDS */
os_memset(attr, 0, sizeof(*attr));
pos = wpabuf_head(msg);
end = pos + wpabuf_len(msg);
while (pos < end) {
if (end - pos < 4) {
wpa_printf(MSG_DEBUG, "WPS: Invalid message - "
"%lu bytes remaining",
(unsigned long) (end - pos));
return -1;
}
type = WPA_GET_BE16(pos);
pos += 2;
len = WPA_GET_BE16(pos);
pos += 2;
wpa_printf(MSG_EXCESSIVE, "WPS: attr type=0x%x len=%u",
type, len);
if (len > end - pos) {
wpa_printf(MSG_DEBUG, "WPS: Attribute overflow");
wpa_hexdump_buf(MSG_MSGDUMP, "WPS: Message data", msg);
#ifdef WPS_WORKAROUNDS
/*
* Some deployed APs seem to have a bug in encoding of
* Network Key attribute in the Credential attribute
* where they add an extra octet after the Network Key
* attribute at least when open network is being
* provisioned.
*/
if ((type & 0xff00) != 0x1000 &&
prev_type == ATTR_NETWORK_KEY) {
wpa_printf(MSG_DEBUG, "WPS: Workaround - try "
"to skip unexpected octet after "
"Network Key");
pos -= 3;
continue;
}
#endif /* WPS_WORKAROUNDS */
return -1;
}
#ifdef WPS_WORKAROUNDS
if (type == 0 && len == 0) {
/*
* Mac OS X 10.6 seems to be adding 0x00 padding to the
* end of M1. Skip those to avoid interop issues.
*/
int i;
for (i = 0; i < end - pos; i++) {
if (pos[i])
break;
}
if (i == end - pos) {
wpa_printf(MSG_DEBUG, "WPS: Workaround - skip "
"unexpected message padding");
break;
}
}
#endif /* WPS_WORKAROUNDS */
if (wps_set_attr(attr, type, pos, len) < 0)
return -1;
#ifdef WPS_WORKAROUNDS
prev_type = type;
#endif /* WPS_WORKAROUNDS */
pos += len;
}
return 0;
}