/*
* EAP-WSC peer for Wi-Fi Protected Setup
* Copyright (c) 2007-2009, 2012, 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 "uuid.h"
#include "eap_i.h"
#include "eap_common/eap_wsc_common.h"
#include "wps/wps.h"
#include "wps/wps_defs.h"
struct eap_wsc_data {
enum { WAIT_START, MESG, WAIT_FRAG_ACK, FAIL } state;
int registrar;
struct wpabuf *in_buf;
struct wpabuf *out_buf;
enum wsc_op_code in_op_code, out_op_code;
size_t out_used;
size_t fragment_size;
struct wps_data *wps;
struct wps_context *wps_ctx;
};
static const char * eap_wsc_state_txt(int state)
{
switch (state) {
case WAIT_START:
return "WAIT_START";
case MESG:
return "MESG";
case WAIT_FRAG_ACK:
return "WAIT_FRAG_ACK";
case FAIL:
return "FAIL";
default:
return "?";
}
}
static void eap_wsc_state(struct eap_wsc_data *data, int state)
{
wpa_printf(MSG_DEBUG, "EAP-WSC: %s -> %s",
eap_wsc_state_txt(data->state),
eap_wsc_state_txt(state));
data->state = state;
}
static int eap_wsc_new_ap_settings(struct wps_credential *cred,
const char *params)
{
const char *pos, *end;
size_t len;
os_memset(cred, 0, sizeof(*cred));
pos = os_strstr(params, "new_ssid=");
if (pos == NULL)
return 0;
pos += 9;
end = os_strchr(pos, ' ');
if (end == NULL)
len = os_strlen(pos);
else
len = end - pos;
if ((len & 1) || len > 2 * sizeof(cred->ssid) ||
hexstr2bin(pos, cred->ssid, len / 2)) {
wpa_printf(MSG_DEBUG, "EAP-WSC: Invalid new_ssid");
return -1;
}
cred->ssid_len = len / 2;
pos = os_strstr(params, "new_auth=");
if (pos == NULL) {
wpa_printf(MSG_DEBUG, "EAP-WSC: Missing new_auth");
return -1;
}
if (os_strncmp(pos + 9, "OPEN", 4) == 0)
cred->auth_type = WPS_AUTH_OPEN;
else if (os_strncmp(pos + 9, "WPAPSK", 6) == 0)
cred->auth_type = WPS_AUTH_WPAPSK;
else if (os_strncmp(pos + 9, "WPA2PSK", 7) == 0)
cred->auth_type = WPS_AUTH_WPA2PSK;
else {
wpa_printf(MSG_DEBUG, "EAP-WSC: Unknown new_auth");
return -1;
}
pos = os_strstr(params, "new_encr=");
if (pos == NULL) {
wpa_printf(MSG_DEBUG, "EAP-WSC: Missing new_encr");
return -1;
}
if (os_strncmp(pos + 9, "NONE", 4) == 0)
cred->encr_type = WPS_ENCR_NONE;
#ifdef CONFIG_TESTING_OPTIONS
else if (os_strncmp(pos + 9, "WEP", 3) == 0)
cred->encr_type = WPS_ENCR_WEP;
#endif /* CONFIG_TESTING_OPTIONS */
else if (os_strncmp(pos + 9, "TKIP", 4) == 0)
cred->encr_type = WPS_ENCR_TKIP;
else if (os_strncmp(pos + 9, "CCMP", 4) == 0)
cred->encr_type = WPS_ENCR_AES;
else {
wpa_printf(MSG_DEBUG, "EAP-WSC: Unknown new_encr");
return -1;
}
pos = os_strstr(params, "new_key=");
if (pos == NULL)
return 0;
pos += 8;
end = os_strchr(pos, ' ');
if (end == NULL)
len = os_strlen(pos);
else
len = end - pos;
if ((len & 1) || len > 2 * sizeof(cred->key) ||
hexstr2bin(pos, cred->key, len / 2)) {
wpa_printf(MSG_DEBUG, "EAP-WSC: Invalid new_key");
return -1;
}
cred->key_len = len / 2;
return 1;
}
static void * eap_wsc_init(struct eap_sm *sm)
{
struct eap_wsc_data *data;
const u8 *identity;
size_t identity_len;
int registrar;
struct wps_config cfg;
const char *pos, *end;
const char *phase1;
struct wps_context *wps;
struct wps_credential new_ap_settings;
int res;
int nfc = 0;
u8 pkhash[WPS_OOB_PUBKEY_HASH_LEN];
wps = sm->wps;
if (wps == NULL) {
wpa_printf(MSG_ERROR, "EAP-WSC: WPS context not available");
return NULL;
}
identity = eap_get_config_identity(sm, &identity_len);
if (identity && identity_len == WSC_ID_REGISTRAR_LEN &&
os_memcmp(identity, WSC_ID_REGISTRAR, WSC_ID_REGISTRAR_LEN) == 0)
registrar = 1; /* Supplicant is Registrar */
else if (identity && identity_len == WSC_ID_ENROLLEE_LEN &&
os_memcmp(identity, WSC_ID_ENROLLEE, WSC_ID_ENROLLEE_LEN) == 0)
registrar = 0; /* Supplicant is Enrollee */
else {
wpa_hexdump_ascii(MSG_INFO, "EAP-WSC: Unexpected identity",
identity, identity_len);
return NULL;
}
data = os_zalloc(sizeof(*data));
if (data == NULL)
return NULL;
data->state = registrar ? MESG : WAIT_START;
data->registrar = registrar;
data->wps_ctx = wps;
os_memset(&cfg, 0, sizeof(cfg));
cfg.wps = wps;
cfg.registrar = registrar;
phase1 = eap_get_config_phase1(sm);
if (phase1 == NULL) {
wpa_printf(MSG_INFO, "EAP-WSC: phase1 configuration data not "
"set");
os_free(data);
return NULL;
}
pos = os_strstr(phase1, "pin=");
if (pos) {
pos += 4;
cfg.pin = (const u8 *) pos;
while (*pos != '\0' && *pos != ' ')
pos++;
cfg.pin_len = pos - (const char *) cfg.pin;
if (cfg.pin_len == 6 &&
os_strncmp((const char *) cfg.pin, "nfc-pw", 6) == 0) {
cfg.pin = NULL;
cfg.pin_len = 0;
nfc = 1;
}
} else {
pos = os_strstr(phase1, "pbc=1");
if (pos)
cfg.pbc = 1;
}
pos = os_strstr(phase1, "dev_pw_id=");
if (pos) {
u16 id = atoi(pos + 10);
if (id == DEV_PW_NFC_CONNECTION_HANDOVER)
nfc = 1;
if (cfg.pin || id == DEV_PW_NFC_CONNECTION_HANDOVER)
cfg.dev_pw_id = id;
}
if (cfg.pin == NULL && !cfg.pbc && !nfc) {
wpa_printf(MSG_INFO, "EAP-WSC: PIN or PBC not set in phase1 "
"configuration data");
os_free(data);
return NULL;
}
pos = os_strstr(phase1, " pkhash=");
if (pos) {
size_t len;
pos += 8;
end = os_strchr(pos, ' ');
if (end)
len = end - pos;
else
len = os_strlen(pos);
if (len != 2 * WPS_OOB_PUBKEY_HASH_LEN ||
hexstr2bin(pos, pkhash, WPS_OOB_PUBKEY_HASH_LEN)) {
wpa_printf(MSG_INFO, "EAP-WSC: Invalid pkhash");
os_free(data);
return NULL;
}
cfg.peer_pubkey_hash = pkhash;
}
res = eap_wsc_new_ap_settings(&new_ap_settings, phase1);
if (res < 0) {
os_free(data);
wpa_printf(MSG_DEBUG, "EAP-WSC: Failed to parse new AP "
"settings");
return NULL;
}
if (res == 1) {
wpa_printf(MSG_DEBUG, "EAP-WSC: Provide new AP settings for "
"WPS");
cfg.new_ap_settings = &new_ap_settings;
}
if (os_strstr(phase1, "multi_ap=1"))
cfg.multi_ap_backhaul_sta = 1;
data->wps = wps_init(&cfg);
if (data->wps == NULL) {
os_free(data);
wpa_printf(MSG_DEBUG, "EAP-WSC: wps_init failed");
return NULL;
}
res = eap_get_config_fragment_size(sm);
if (res > 0)
data->fragment_size = res;
else
data->fragment_size = WSC_FRAGMENT_SIZE;
wpa_printf(MSG_DEBUG, "EAP-WSC: Fragment size limit %u",
(unsigned int) data->fragment_size);
if (registrar && cfg.pin) {
wps_registrar_add_pin(data->wps_ctx->registrar, NULL, NULL,
cfg.pin, cfg.pin_len, 0);
}
/* Use reduced client timeout for WPS to avoid long wait */
if (sm->ClientTimeout > 30)
sm->ClientTimeout = 30;
return data;
}
static void eap_wsc_deinit(struct eap_sm *sm, void *priv)
{
struct eap_wsc_data *data = priv;
wpabuf_free(data->in_buf);
wpabuf_free(data->out_buf);
wps_deinit(data->wps);
os_free(data->wps_ctx->network_key);
data->wps_ctx->network_key = NULL;
os_free(data);
}
static struct wpabuf * eap_wsc_build_msg(struct eap_wsc_data *data,
struct eap_method_ret *ret, u8 id)
{
struct wpabuf *resp;
u8 flags;
size_t send_len, plen;
ret->ignore = FALSE;
wpa_printf(MSG_DEBUG, "EAP-WSC: Generating Response");
ret->allowNotifications = TRUE;
flags = 0;
send_len = wpabuf_len(data->out_buf) - data->out_used;
if (2 + send_len > data->fragment_size) {
send_len = data->fragment_size - 2;
flags |= WSC_FLAGS_MF;
if (data->out_used == 0) {
flags |= WSC_FLAGS_LF;
send_len -= 2;
}
}
plen = 2 + send_len;
if (flags & WSC_FLAGS_LF)
plen += 2;
resp = eap_msg_alloc(EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC, plen,
EAP_CODE_RESPONSE, id);
if (resp == NULL)
return NULL;
wpabuf_put_u8(resp, data->out_op_code); /* Op-Code */
wpabuf_put_u8(resp, flags); /* Flags */
if (flags & WSC_FLAGS_LF)
wpabuf_put_be16(resp, wpabuf_len(data->out_buf));
wpabuf_put_data(resp, wpabuf_head_u8(data->out_buf) + data->out_used,
send_len);
data->out_used += send_len;
ret->methodState = METHOD_MAY_CONT;
ret->decision = DECISION_FAIL;
if (data->out_used == wpabuf_len(data->out_buf)) {
wpa_printf(MSG_DEBUG, "EAP-WSC: Sending out %lu bytes "
"(message sent completely)",
(unsigned long) send_len);
wpabuf_free(data->out_buf);
data->out_buf = NULL;
data->out_used = 0;
if ((data->state == FAIL && data->out_op_code == WSC_ACK) ||
data->out_op_code == WSC_NACK ||
data->out_op_code == WSC_Done) {
eap_wsc_state(data, FAIL);
ret->methodState = METHOD_DONE;
} else
eap_wsc_state(data, MESG);
} else {
wpa_printf(MSG_DEBUG, "EAP-WSC: Sending out %lu bytes "
"(%lu more to send)", (unsigned long) send_len,
(unsigned long) wpabuf_len(data->out_buf) -
data->out_used);
eap_wsc_state(data, WAIT_FRAG_ACK);
}
return resp;
}
static int eap_wsc_process_cont(struct eap_wsc_data *data,
const u8 *buf, size_t len, u8 op_code)
{
/* Process continuation of a pending message */
if (op_code != data->in_op_code) {
wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d in "
"fragment (expected %d)",
op_code, data->in_op_code);
return -1;
}
if (len > wpabuf_tailroom(data->in_buf)) {
wpa_printf(MSG_DEBUG, "EAP-WSC: Fragment overflow");
eap_wsc_state(data, FAIL);
return -1;
}
wpabuf_put_data(data->in_buf, buf, len);
wpa_printf(MSG_DEBUG, "EAP-WSC: Received %lu bytes, waiting "
"for %lu bytes more", (unsigned long) len,
(unsigned long) wpabuf_tailroom(data->in_buf));
return 0;
}
static struct wpabuf * eap_wsc_process_fragment(struct eap_wsc_data *data,
struct eap_method_ret *ret,
u8 id, u8 flags, u8 op_code,
u16 message_length,
const u8 *buf, size_t len)
{
/* Process a fragment that is not the last one of the message */
if (data->in_buf == NULL && !(flags & WSC_FLAGS_LF)) {
wpa_printf(MSG_DEBUG, "EAP-WSC: No Message Length field in a "
"fragmented packet");
ret->ignore = TRUE;
return NULL;
}
if (data->in_buf == NULL) {
/* First fragment of the message */
data->in_buf = wpabuf_alloc(message_length);
if (data->in_buf == NULL) {
wpa_printf(MSG_DEBUG, "EAP-WSC: No memory for "
"message");
ret->ignore = TRUE;
return NULL;
}
data->in_op_code = op_code;
wpabuf_put_data(data->in_buf, buf, len);
wpa_printf(MSG_DEBUG, "EAP-WSC: Received %lu bytes in first "
"fragment, waiting for %lu bytes more",
(unsigned long) len,
(unsigned long) wpabuf_tailroom(data->in_buf));
}
return eap_wsc_build_frag_ack(id, EAP_CODE_RESPONSE);
}
static struct wpabuf * eap_wsc_process(struct eap_sm *sm, void *priv,
struct eap_method_ret *ret,
const struct wpabuf *reqData)
{
struct eap_wsc_data *data = priv;
const u8 *start, *pos, *end;
size_t len;
u8 op_code, flags, id;
u16 message_length = 0;
enum wps_process_res res;
struct wpabuf tmpbuf;
struct wpabuf *r;
pos = eap_hdr_validate(EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC, reqData,
&len);
if (pos == NULL || len < 2) {
ret->ignore = TRUE;
return NULL;
}
id = eap_get_id(reqData);
start = pos;
end = start + len;
op_code = *pos++;
flags = *pos++;
if (flags & WSC_FLAGS_LF) {
if (end - pos < 2) {
wpa_printf(MSG_DEBUG, "EAP-WSC: Message underflow");
ret->ignore = TRUE;
return NULL;
}
message_length = WPA_GET_BE16(pos);
pos += 2;
if (message_length < end - pos || message_length > 50000) {
wpa_printf(MSG_DEBUG, "EAP-WSC: Invalid Message "
"Length");
ret->ignore = TRUE;
return NULL;
}
}
wpa_printf(MSG_DEBUG, "EAP-WSC: Received packet: Op-Code %d "
"Flags 0x%x Message Length %d",
op_code, flags, message_length);
if (data->state == WAIT_FRAG_ACK) {
if (op_code != WSC_FRAG_ACK) {
wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d "
"in WAIT_FRAG_ACK state", op_code);
ret->ignore = TRUE;
return NULL;
}
wpa_printf(MSG_DEBUG, "EAP-WSC: Fragment acknowledged");
eap_wsc_state(data, MESG);
return eap_wsc_build_msg(data, ret, id);
}
if (op_code != WSC_ACK && op_code != WSC_NACK && op_code != WSC_MSG &&
op_code != WSC_Done && op_code != WSC_Start) {
wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d",
op_code);
ret->ignore = TRUE;
return NULL;
}
if (data->state == WAIT_START) {
if (op_code != WSC_Start) {
wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d "
"in WAIT_START state", op_code);
ret->ignore = TRUE;
return NULL;
}
wpa_printf(MSG_DEBUG, "EAP-WSC: Received start");
eap_wsc_state(data, MESG);
/* Start message has empty payload, skip processing */
goto send_msg;
} else if (op_code == WSC_Start) {
wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d",
op_code);
ret->ignore = TRUE;
return NULL;
}
if (data->in_buf &&
eap_wsc_process_cont(data, pos, end - pos, op_code) < 0) {
ret->ignore = TRUE;
return NULL;
}
if (flags & WSC_FLAGS_MF) {
return eap_wsc_process_fragment(data, ret, id, flags, op_code,
message_length, pos,
end - pos);
}
if (data->in_buf == NULL) {
/* Wrap unfragmented messages as wpabuf without extra copy */
wpabuf_set(&tmpbuf, pos, end - pos);
data->in_buf = &tmpbuf;
}
res = wps_process_msg(data->wps, op_code, data->in_buf);
switch (res) {
case WPS_DONE:
wpa_printf(MSG_DEBUG, "EAP-WSC: WPS processing completed "
"successfully - wait for EAP failure");
eap_wsc_state(data, FAIL);
break;
case WPS_CONTINUE:
eap_wsc_state(data, MESG);
break;
case WPS_FAILURE:
case WPS_PENDING:
wpa_printf(MSG_DEBUG, "EAP-WSC: WPS processing failed");
eap_wsc_state(data, FAIL);
break;
}
if (data->in_buf != &tmpbuf)
wpabuf_free(data->in_buf);
data->in_buf = NULL;
send_msg:
if (data->out_buf == NULL) {
data->out_buf = wps_get_msg(data->wps, &data->out_op_code);
if (data->out_buf == NULL) {
wpa_printf(MSG_DEBUG, "EAP-WSC: Failed to receive "
"message from WPS");
eap_wsc_state(data, FAIL);
ret->methodState = METHOD_DONE;
ret->decision = DECISION_FAIL;
return NULL;
}
data->out_used = 0;
}
eap_wsc_state(data, MESG);
r = eap_wsc_build_msg(data, ret, id);
if (data->state == FAIL && ret->methodState == METHOD_DONE) {
/* Use reduced client timeout for WPS to avoid long wait */
if (sm->ClientTimeout > 2)
sm->ClientTimeout = 2;
}
return r;
}
int eap_peer_wsc_register(void)
{
struct eap_method *eap;
eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC,
"WSC");
if (eap == NULL)
return -1;
eap->init = eap_wsc_init;
eap->deinit = eap_wsc_deinit;
eap->process = eap_wsc_process;
return eap_peer_method_register(eap);
}