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/*
* Wi-Fi Protected Setup
* Copyright (c) 2007-2009, 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 "crypto/dh_group5.h"
#include "common/ieee802_11_defs.h"
#include "wps_i.h"
#include "wps_dev_attr.h"
#ifdef CONFIG_WPS_TESTING
int wps_version_number = 0x20;
int wps_testing_stub_cred = 0;
int wps_corrupt_pkhash = 0;
int wps_force_auth_types_in_use = 0;
u16 wps_force_auth_types = 0;
int wps_force_encr_types_in_use = 0;
u16 wps_force_encr_types = 0;
#endif /* CONFIG_WPS_TESTING */
/**
* wps_init - Initialize WPS Registration protocol data
* @cfg: WPS configuration
* Returns: Pointer to allocated data or %NULL on failure
*
* This function is used to initialize WPS data for a registration protocol
* instance (i.e., each run of registration protocol as a Registrar of
* Enrollee. The caller is responsible for freeing this data after the
* registration run has been completed by calling wps_deinit().
*/
struct wps_data * wps_init(const struct wps_config *cfg)
{
struct wps_data *data = os_zalloc(sizeof(*data));
if (data == NULL)
return NULL;
data->wps = cfg->wps;
data->registrar = cfg->registrar;
if (cfg->registrar) {
os_memcpy(data->uuid_r, cfg->wps->uuid, WPS_UUID_LEN);
} else {
os_memcpy(data->mac_addr_e, cfg->wps->dev.mac_addr, ETH_ALEN);
os_memcpy(data->uuid_e, cfg->wps->uuid, WPS_UUID_LEN);
}
if (cfg->pbc == 0 && cfg->pin_len) {
data->dev_pw_id = cfg->dev_pw_id;
data->dev_password = os_memdup(cfg->pin, cfg->pin_len);
if (data->dev_password == NULL) {
os_free(data);
return NULL;
}
data->dev_password_len = cfg->pin_len;
wpa_hexdump_key(MSG_DEBUG, "WPS: AP PIN dev_password",
data->dev_password, data->dev_password_len);
}
#ifdef CONFIG_WPS_NFC
if (cfg->pin == NULL &&
cfg->dev_pw_id == DEV_PW_NFC_CONNECTION_HANDOVER)
data->dev_pw_id = cfg->dev_pw_id;
if (cfg->wps->ap && !cfg->registrar && cfg->wps->ap_nfc_dev_pw_id) {
/* Keep AP PIN as alternative Device Password */
data->alt_dev_pw_id = data->dev_pw_id;
data->alt_dev_password = data->dev_password;
data->alt_dev_password_len = data->dev_password_len;
data->dev_pw_id = cfg->wps->ap_nfc_dev_pw_id;
data->dev_password =
os_memdup(wpabuf_head(cfg->wps->ap_nfc_dev_pw),
wpabuf_len(cfg->wps->ap_nfc_dev_pw));
if (data->dev_password == NULL) {
os_free(data);
return NULL;
}
data->dev_password_len = wpabuf_len(cfg->wps->ap_nfc_dev_pw);
wpa_hexdump_key(MSG_DEBUG, "WPS: NFC dev_password",
data->dev_password, data->dev_password_len);
}
#endif /* CONFIG_WPS_NFC */
data->pbc = cfg->pbc;
if (cfg->pbc) {
/* Use special PIN '00000000' for PBC */
data->dev_pw_id = DEV_PW_PUSHBUTTON;
bin_clear_free(data->dev_password, data->dev_password_len);
data->dev_password = (u8 *) os_strdup("00000000");
if (data->dev_password == NULL) {
os_free(data);
return NULL;
}
data->dev_password_len = 8;
}
data->state = data->registrar ? RECV_M1 : SEND_M1;
#ifndef ESP_SUPPLICANT
if (cfg->assoc_wps_ie) {
struct wps_parse_attr attr;
wpa_hexdump_buf(MSG_DEBUG, "WPS: WPS IE from (Re)AssocReq",
cfg->assoc_wps_ie);
if (wps_parse_msg(cfg->assoc_wps_ie, &attr) < 0) {
wpa_printf(MSG_DEBUG, "WPS: Failed to parse WPS IE "
"from (Re)AssocReq");
} else if (attr.request_type == NULL) {
wpa_printf(MSG_DEBUG, "WPS: No Request Type attribute "
"in (Re)AssocReq WPS IE");
} else {
wpa_printf(MSG_DEBUG, "WPS: Request Type (from WPS IE "
"in (Re)AssocReq WPS IE): %d",
*attr.request_type);
data->request_type = *attr.request_type;
}
}
if (cfg->new_ap_settings) {
data->new_ap_settings =
os_memdup(cfg->new_ap_settings,
sizeof(*data->new_ap_settings));
if (data->new_ap_settings == NULL) {
bin_clear_free(data->dev_password,
data->dev_password_len);
os_free(data);
return NULL;
}
}
if (cfg->peer_addr)
os_memcpy(data->peer_dev.mac_addr, cfg->peer_addr, ETH_ALEN);
if (cfg->p2p_dev_addr)
os_memcpy(data->p2p_dev_addr, cfg->p2p_dev_addr, ETH_ALEN);
data->use_psk_key = cfg->use_psk_key;
data->pbc_in_m1 = cfg->pbc_in_m1;
if (cfg->peer_pubkey_hash) {
os_memcpy(data->peer_pubkey_hash, cfg->peer_pubkey_hash,
WPS_OOB_PUBKEY_HASH_LEN);
data->peer_pubkey_hash_set = 1;
}
data->multi_ap_backhaul_sta = cfg->multi_ap_backhaul_sta;
#endif
return data;
}
/**
* wps_deinit - Deinitialize WPS Registration protocol data
* @data: WPS Registration protocol data from wps_init()
*/
void wps_deinit(struct wps_data *data)
{
#ifdef CONFIG_WPS_NFC
if (data->registrar && data->nfc_pw_token)
wps_registrar_remove_nfc_pw_token(data->wps->registrar,
data->nfc_pw_token);
#endif /* CONFIG_WPS_NFC */
#ifdef CONFIG_WPS_REGISTRAR
if (data->wps_pin_revealed) {
wpa_printf(MSG_DEBUG, "WPS: Full PIN information revealed and "
"negotiation failed");
if (data->registrar)
wps_registrar_invalidate_pin(data->wps->registrar,
data->uuid_e);
} else if (data->registrar)
wps_registrar_unlock_pin(data->wps->registrar, data->uuid_e);
#endif
wpabuf_clear_free(data->dh_privkey);
wpabuf_free(data->dh_pubkey_e);
wpabuf_free(data->dh_pubkey_r);
wpabuf_free(data->last_msg);
bin_clear_free(data->dev_password, data->dev_password_len);
#ifndef ESP_SUPPLICANT
bin_clear_free(data->alt_dev_password, data->alt_dev_password_len);
bin_clear_free(data->new_psk, data->new_psk_len);
#endif /* ESP_SUPPLICANT */
wps_device_data_free(&data->peer_dev);
bin_clear_free(data->new_ap_settings, sizeof(*data->new_ap_settings));
dh5_free(data->dh_ctx);
os_free(data);
}
/**
* wps_process_msg - Process a WPS message
* @wps: WPS Registration protocol data from wps_init()
* @op_code: Message OP Code
* @msg: Message data
* Returns: Processing result
*
* This function is used to process WPS messages with OP Codes WSC_ACK,
* WSC_NACK, WSC_MSG, and WSC_Done. The caller (e.g., EAP server/peer) is
* responsible for reassembling the messages before calling this function.
* Response to this message is built by calling wps_get_msg().
*/
enum wps_process_res wps_process_msg(struct wps_data *wps,
enum wsc_op_code op_code,
const struct wpabuf *msg)
{
if (wps->registrar)
return wps_registrar_process_msg(wps, op_code, msg);
else
return wps_enrollee_process_msg(wps, op_code, msg);
}
/**
* wps_get_msg - Build a WPS message
* @wps: WPS Registration protocol data from wps_init()
* @op_code: Buffer for returning message OP Code
* Returns: The generated WPS message or %NULL on failure
*
* This function is used to build a response to a message processed by calling
* wps_process_msg(). The caller is responsible for freeing the buffer.
*/
struct wpabuf * wps_get_msg(struct wps_data *wps, enum wsc_op_code *op_code)
{
return wps_registrar_get_msg(wps, op_code);
}
/**
* wps_is_selected_pbc_registrar - Check whether WPS IE indicates active PBC
* @msg: WPS IE contents from Beacon or Probe Response frame
* Returns: 1 if PBC Registrar is active, 0 if not
*/
int wps_is_selected_pbc_registrar(const struct wpabuf *msg)
{
struct wps_parse_attr *attr = os_zalloc(sizeof(struct wps_parse_attr));
if (!attr)
return 0;
/*
* In theory, this could also verify that attr.sel_reg_config_methods
* includes WPS_CONFIG_PUSHBUTTON, but some deployed AP implementations
* do not set Selected Registrar Config Methods attribute properly, so
* it is safer to just use Device Password ID here.
*/
if (wps_parse_msg(msg, attr) < 0 ||
!attr->selected_registrar || *attr->selected_registrar == 0 ||
!attr->dev_password_id ||
WPA_GET_BE16(attr->dev_password_id) != DEV_PW_PUSHBUTTON) {
os_free(attr);
return 0;
}
#ifdef CONFIG_WPS_STRICT
if (!attr->sel_reg_config_methods ||
!(WPA_GET_BE16(attr->sel_reg_config_methods) &
WPS_CONFIG_PUSHBUTTON)) {
os_free(attr);
return 0;
}
#endif /* CONFIG_WPS_STRICT */
os_free(attr);
return 1;
}
static int is_selected_pin_registrar(struct wps_parse_attr *attr)
{
/*
* In theory, this could also verify that attr.sel_reg_config_methods
* includes WPS_CONFIG_LABEL, WPS_CONFIG_DISPLAY, or WPS_CONFIG_KEYPAD,
* but some deployed AP implementations do not set Selected Registrar
* Config Methods attribute properly, so it is safer to just use
* Device Password ID here.
*/
if (!attr->selected_registrar || *attr->selected_registrar == 0) {
return 0;
}
if (attr->dev_password_id != NULL &&
WPA_GET_BE16(attr->dev_password_id) == DEV_PW_PUSHBUTTON) {
return 0;
}
#ifdef CONFIG_WPS_STRICT
if (!attr->sel_reg_config_methods ||
!(WPA_GET_BE16(attr->sel_reg_config_methods) &
(WPS_CONFIG_LABEL | WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD)))
return 0;
#endif /* CONFIG_WPS_STRICT */
return 1;
}
/**
* wps_is_selected_pin_registrar - Check whether WPS IE indicates active PIN
* @msg: WPS IE contents from Beacon or Probe Response frame
* Returns: 1 if PIN Registrar is active, 0 if not
*/
int wps_is_selected_pin_registrar(const struct wpabuf *msg)
{
struct wps_parse_attr *attr;
int ret;
attr = os_zalloc(sizeof(struct wps_parse_attr));
if (attr == NULL)
return -99;
if (wps_parse_msg(msg, attr) < 0) {
os_free(attr);
return 0;
}
ret = is_selected_pin_registrar(attr);
os_free(attr);
return ret;
}
/**
* wps_is_addr_authorized - Check whether WPS IE authorizes MAC address
* @msg: WPS IE contents from Beacon or Probe Response frame
* @addr: MAC address to search for
* @ver1_compat: Whether to use version 1 compatibility mode
* Returns: 2 if the specified address is explicit authorized, 1 if address is
* authorized (broadcast), 0 if not
*/
int wps_is_addr_authorized(const struct wpabuf *msg, const u8 *addr,
int ver1_compat)
{
struct wps_parse_attr *attr;
int ret = 0;
unsigned int i;
const u8 *pos;
const u8 bcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
attr = os_zalloc(sizeof(struct wps_parse_attr));
if (attr == NULL) {
ret = 0;
goto _out;
}
if (wps_parse_msg(msg, attr) < 0) {
ret = 0;
goto _out;
}
if (!attr->version2 && ver1_compat) {
/*
* Version 1.0 AP - AuthorizedMACs not used, so revert back to
* old mechanism of using SelectedRegistrar.
*/
ret = is_selected_pin_registrar(attr);
goto _out;
}
if (!attr->authorized_macs) {
ret = 0;
goto _out;
}
pos = attr->authorized_macs;
for (i = 0; i < attr->authorized_macs_len / ETH_ALEN; i++) {
if (os_memcmp(pos, addr, ETH_ALEN) == 0) {
ret = 2;
goto _out;
}
if (os_memcmp(pos, bcast, ETH_ALEN) == 0) {
ret = 1;
goto _out;
}
pos += ETH_ALEN;
}
_out:
if (attr)
os_free(attr);
return ret;
}
/**
* wps_ap_priority_compar - Prioritize WPS IE from two APs
* @wps_a: WPS IE contents from Beacon or Probe Response frame
* @wps_b: WPS IE contents from Beacon or Probe Response frame
* Returns: 1 if wps_b is considered more likely selection for WPS
* provisioning, -1 if wps_a is considered more like, or 0 if no preference
*/
int wps_ap_priority_compar(const struct wpabuf *wps_a,
const struct wpabuf *wps_b)
{
struct wps_parse_attr *attr = NULL;
int sel_a, sel_b;
int ret = 0; /* No preference */
attr = os_zalloc(sizeof(*attr));
if (!attr)
return ret;
if (wps_a == NULL || wps_parse_msg(wps_a, attr) < 0) {
ret = 1;
goto exit;
}
sel_a = attr->selected_registrar && *(attr->selected_registrar) != 0;
if (wps_b == NULL || wps_parse_msg(wps_b, attr) < 0) {
ret = -1;
goto exit;
}
sel_b = attr->selected_registrar && *(attr->selected_registrar) != 0;
if (sel_a && !sel_b) {
ret = -1;
goto exit;
}
if (!sel_a && sel_b) {
ret = 1;
goto exit;
}
exit:
os_free(attr);
return ret;
}
/**
* wps_get_uuid_e - Get UUID-E from WPS IE
* @msg: WPS IE contents from Beacon or Probe Response frame
* Returns: Pointer to UUID-E or %NULL if not included
*
* The returned pointer is to the msg contents and it remains valid only as
* long as the msg buffer is valid.
*/
const u8 * wps_get_uuid_e(const struct wpabuf *msg)
{
struct wps_parse_attr *attr;
const u8 *uuid_e;
attr = (struct wps_parse_attr *)os_zalloc(sizeof(struct wps_parse_attr));
if (attr == NULL)
return NULL;
if (wps_parse_msg(msg, attr) < 0) {
uuid_e = NULL;
} else {
uuid_e = attr->uuid_e;
}
os_free(attr);
return uuid_e;
}
/**
* wps_is_20 - Check whether WPS attributes claim support for WPS 2.0
*/
int wps_is_20(const struct wpabuf *msg)
{
struct wps_parse_attr *attr;
int ret;
attr = (struct wps_parse_attr *)os_zalloc(sizeof(struct wps_parse_attr));
if (attr == NULL)
return 0;
if (msg == NULL || wps_parse_msg(msg, attr) < 0) {
ret = 0;
} else {
ret = (attr->version2 != NULL);
}
os_free(attr);
return ret;
}
/**
* wps_build_assoc_req_ie - Build WPS IE for (Re)Association Request
* @req_type: Value for Request Type attribute
* Returns: WPS IE or %NULL on failure
*
* The caller is responsible for freeing the buffer.
*/
struct wpabuf * wps_build_assoc_req_ie(enum wps_request_type req_type)
{
struct wpabuf *ie;
u8 *len;
wpa_printf(MSG_DEBUG, "WPS: Building WPS IE for (Re)Association "
"Request");
ie = wpabuf_alloc(100);
if (ie == NULL)
return NULL;
wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
len = wpabuf_put(ie, 1);
wpabuf_put_be32(ie, WPS_DEV_OUI_WFA);
if (wps_build_version(ie) ||
wps_build_req_type(ie, req_type) ||
wps_build_wfa_ext(ie, 0, NULL, 0, 0)) {
wpabuf_free(ie);
return NULL;
}
*len = wpabuf_len(ie) - 2;
return ie;
}
/**
* wps_build_assoc_resp_ie - Build WPS IE for (Re)Association Response
* Returns: WPS IE or %NULL on failure
*
* The caller is responsible for freeing the buffer.
*/
struct wpabuf * wps_build_assoc_resp_ie(void)
{
struct wpabuf *ie;
u8 *len;
wpa_printf(MSG_DEBUG, "WPS: Building WPS IE for (Re)Association "
"Response");
ie = wpabuf_alloc(100);
if (ie == NULL)
return NULL;
wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
len = wpabuf_put(ie, 1);
wpabuf_put_be32(ie, WPS_DEV_OUI_WFA);
if (wps_build_version(ie) ||
wps_build_resp_type(ie, WPS_RESP_AP) ||
wps_build_wfa_ext(ie, 0, NULL, 0, 0)) {
wpabuf_free(ie);
return NULL;
}
*len = wpabuf_len(ie) - 2;
return ie;
}
/**
* wps_build_probe_req_ie - Build WPS IE for Probe Request
* @pw_id: Password ID (DEV_PW_PUSHBUTTON for active PBC and DEV_PW_DEFAULT for
* most other use cases)
* @dev: Device attributes
* @uuid: Own UUID
* @req_type: Value for Request Type attribute
* @num_req_dev_types: Number of requested device types
* @req_dev_types: Requested device types (8 * num_req_dev_types octets) or
* %NULL if none
* Returns: WPS IE or %NULL on failure
*
* The caller is responsible for freeing the buffer.
*/
struct wpabuf * wps_build_probe_req_ie(u16 pw_id, struct wps_device_data *dev,
const u8 *uuid,
enum wps_request_type req_type,
unsigned int num_req_dev_types,
const u8 *req_dev_types)
{
struct wpabuf *ie;
wpa_printf(MSG_DEBUG, "WPS: Building WPS IE for Probe Request");
ie = wpabuf_alloc(500);
if (ie == NULL)
return NULL;
if (wps_build_version(ie) ||
wps_build_req_type(ie, req_type) ||
wps_build_config_methods(ie, dev->config_methods) ||
wps_build_uuid_e(ie, uuid) ||
wps_build_primary_dev_type(dev, ie) ||
wps_build_rf_bands(dev, ie, 0) ||
wps_build_assoc_state(NULL, ie) ||
wps_build_config_error(ie, WPS_CFG_NO_ERROR) ||
wps_build_dev_password_id(ie, pw_id) ||
wps_build_manufacturer(dev, ie) ||
wps_build_model_name(dev, ie) ||
wps_build_model_number(dev, ie) ||
wps_build_dev_name(dev, ie) ||
wps_build_wfa_ext(ie, req_type == WPS_REQ_ENROLLEE, NULL, 0, 0) ||
wps_build_req_dev_type(dev, ie, num_req_dev_types, req_dev_types)
||
wps_build_secondary_dev_type(dev, ie)
) {
wpabuf_free(ie);
return NULL;
}
return wps_ie_encapsulate(ie);
}
#ifdef CONFIG_WPS_UPNP
void wps_free_pending_msgs(struct upnp_pending_message *msgs)
{
struct upnp_pending_message *p, *prev;
p = msgs;
while (p) {
prev = p;
p = p->next;
wpabuf_free(prev->msg);
os_free(prev);
}
}
#endif
int wps_attr_text(struct wpabuf *data, char *buf, char *end)
{
struct wps_parse_attr *attr;
char *pos = buf;
int ret;
attr = (struct wps_parse_attr *)os_zalloc(sizeof(struct wps_parse_attr));
if (attr == NULL)
return -99;
if (wps_parse_msg(data, attr) < 0) {
ret = -1;
goto _out;
}
if (attr->wps_state) {
if (*attr->wps_state == WPS_STATE_NOT_CONFIGURED)
ret = snprintf(pos, end - pos,
"wps_state=unconfigured\n");
else if (*attr->wps_state == WPS_STATE_CONFIGURED)
ret = snprintf(pos, end - pos,
"wps_state=configured\n");
else
ret = 0;
if (ret < 0 || ret >= end - pos) {
ret = pos - buf;
goto _out;
}
pos += ret;
}
if (attr->ap_setup_locked && *attr->ap_setup_locked) {
ret = snprintf(pos, end - pos,
"wps_ap_setup_locked=1\n");
if (ret < 0 || ret >= end - pos) {
ret = pos - buf;
goto _out;
}
pos += ret;
}
if (attr->selected_registrar && *attr->selected_registrar) {
ret = snprintf(pos, end - pos,
"wps_selected_registrar=1\n");
if (ret < 0 || ret >= end - pos) {
ret = pos - buf;
goto _out;
}
pos += ret;
}
if (attr->dev_password_id) {
ret = snprintf(pos, end - pos,
"wps_device_password_id=%u\n",
WPA_GET_BE16(attr->dev_password_id));
if (ret < 0 || ret >= end - pos) {
ret = pos - buf;
goto _out;
}
pos += ret;
}
if (attr->sel_reg_config_methods) {
ret = snprintf(pos, end - pos,
"wps_selected_registrar_config_methods="
"0x%04x\n",
WPA_GET_BE16(attr->sel_reg_config_methods));
if (ret < 0 || ret >= end - pos) {
ret = pos - buf;
goto _out;
}
pos += ret;
}
if (attr->primary_dev_type) {
char devtype[WPS_DEV_TYPE_BUFSIZE];
ret = snprintf(pos, end - pos,
"wps_primary_device_type=%s\n",
wps_dev_type_bin2str(attr->primary_dev_type,
devtype,
sizeof(devtype)));
if (ret < 0 || ret >= end - pos) {
ret = pos - buf;
goto _out;
}
pos += ret;
}
if (attr->dev_name) {
char *str = (char *)os_malloc(attr->dev_name_len + 1);
size_t i;
if (str == NULL) {
ret = pos - buf;
goto _out;
}
for (i = 0; i < attr->dev_name_len; i++) {
if (attr->dev_name[i] < 32)
str[i] = '_';
else
str[i] = attr->dev_name[i];
}
str[i] = '\0';
ret = snprintf(pos, end - pos, "wps_device_name=%s\n", str);
os_free(str);
if (ret < 0 || ret >= end - pos) {
ret = pos - buf;
goto _out;
}
pos += ret;
}
if (attr->config_methods) {
ret = snprintf(pos, end - pos,
"wps_config_methods=0x%04x\n",
WPA_GET_BE16(attr->config_methods));
if (ret < 0 || ret >= end - pos) {
ret = pos - buf;
goto _out;
}
pos += ret;
}
ret = pos - buf;
_out:
if (attr)
os_free(attr);
return ret;
}
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