+++ /dev/null
-/*
- * EAP-WSC server for Wi-Fi Protected Setup
- * Copyright (c) 2007-2008, Jouni Malinen <j@w1.fi>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Alternatively, this software may be distributed under the terms of BSD
- * license.
- *
- * See README and COPYING for more details.
- */
-
-#include "includes.h"
-
-#include "common.h"
-#include "eloop.h"
-#include "eap_i.h"
-#include "eap_common/eap_wsc_common.h"
-#include "wps/wps.h"
-
-
-struct eap_wsc_data {
- enum { START, MESG, FRAG_ACK, WAIT_FRAG_ACK, DONE, 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;
- int ext_reg_timeout;
-};
-
-
-#ifndef CONFIG_NO_STDOUT_DEBUG
-static const char * eap_wsc_state_txt(int state)
-{
- switch (state) {
- case START:
- return "START";
- case MESG:
- return "MESG";
- case FRAG_ACK:
- return "FRAG_ACK";
- case WAIT_FRAG_ACK:
- return "WAIT_FRAG_ACK";
- case DONE:
- return "DONE";
- case FAIL:
- return "FAIL";
- default:
- return "?";
- }
-}
-#endif /* CONFIG_NO_STDOUT_DEBUG */
-
-
-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 void eap_wsc_ext_reg_timeout(void *eloop_ctx, void *timeout_ctx)
-{
- struct eap_sm *sm = eloop_ctx;
- struct eap_wsc_data *data = timeout_ctx;
-
- if (sm->method_pending != METHOD_PENDING_WAIT)
- return;
-
- wpa_printf(MSG_DEBUG, "EAP-WSC: Timeout while waiting for an External "
- "Registrar");
- data->ext_reg_timeout = 1;
- eap_sm_pending_cb(sm);
-}
-
-
-static void * eap_wsc_init(struct eap_sm *sm)
-{
- struct eap_wsc_data *data;
- int registrar;
- struct wps_config cfg;
-
- if (sm->identity && sm->identity_len == WSC_ID_REGISTRAR_LEN &&
- os_memcmp(sm->identity, WSC_ID_REGISTRAR, WSC_ID_REGISTRAR_LEN) ==
- 0)
- registrar = 0; /* Supplicant is Registrar */
- else if (sm->identity && sm->identity_len == WSC_ID_ENROLLEE_LEN &&
- os_memcmp(sm->identity, WSC_ID_ENROLLEE, WSC_ID_ENROLLEE_LEN)
- == 0)
- registrar = 1; /* Supplicant is Enrollee */
- else {
- wpa_hexdump_ascii(MSG_INFO, "EAP-WSC: Unexpected identity",
- sm->identity, sm->identity_len);
- return NULL;
- }
-
- data = os_zalloc(sizeof(*data));
- if (data == NULL)
- return NULL;
- data->state = registrar ? START : MESG;
- data->registrar = registrar;
-
- os_memset(&cfg, 0, sizeof(cfg));
- cfg.wps = sm->wps;
- cfg.registrar = registrar;
- if (registrar) {
- if (sm->wps == NULL || sm->wps->registrar == NULL) {
- wpa_printf(MSG_INFO, "EAP-WSC: WPS Registrar not "
- "initialized");
- os_free(data);
- return NULL;
- }
- } else {
- if (sm->user == NULL || sm->user->password == NULL) {
- /*
- * In theory, this should not really be needed, but
- * Windows 7 uses Registrar mode to probe AP's WPS
- * capabilities before trying to use Enrollee and fails
- * if the AP does not allow that probing to happen..
- */
- wpa_printf(MSG_DEBUG, "EAP-WSC: No AP PIN (password) "
- "configured for Enrollee functionality - "
- "allow for probing capabilities (M1)");
- } else {
- cfg.pin = sm->user->password;
- cfg.pin_len = sm->user->password_len;
- }
- }
- cfg.assoc_wps_ie = sm->assoc_wps_ie;
- cfg.peer_addr = sm->peer_addr;
- if (sm->assoc_p2p_ie) {
- wpa_printf(MSG_DEBUG, "EAP-WSC: Prefer PSK format for P2P "
- "client");
- cfg.use_psk_key = 1;
- }
- data->wps = wps_init(&cfg);
- if (data->wps == NULL) {
- os_free(data);
- return NULL;
- }
- data->fragment_size = sm->fragment_size > 0 ? sm->fragment_size :
- WSC_FRAGMENT_SIZE;
-
- return data;
-}
-
-
-static void eap_wsc_reset(struct eap_sm *sm, void *priv)
-{
- struct eap_wsc_data *data = priv;
- eloop_cancel_timeout(eap_wsc_ext_reg_timeout, sm, data);
- wpabuf_free(data->in_buf);
- wpabuf_free(data->out_buf);
- wps_deinit(data->wps);
- os_free(data);
-}
-
-
-static struct wpabuf * eap_wsc_build_start(struct eap_sm *sm,
- struct eap_wsc_data *data, u8 id)
-{
- struct wpabuf *req;
-
- req = eap_msg_alloc(EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC, 2,
- EAP_CODE_REQUEST, id);
- if (req == NULL) {
- wpa_printf(MSG_ERROR, "EAP-WSC: Failed to allocate memory for "
- "request");
- return NULL;
- }
-
- wpa_printf(MSG_DEBUG, "EAP-WSC: Send WSC/Start");
- wpabuf_put_u8(req, WSC_Start); /* Op-Code */
- wpabuf_put_u8(req, 0); /* Flags */
-
- return req;
-}
-
-
-static struct wpabuf * eap_wsc_build_msg(struct eap_wsc_data *data, u8 id)
-{
- struct wpabuf *req;
- u8 flags;
- size_t send_len, plen;
-
- 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;
- req = eap_msg_alloc(EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC, plen,
- EAP_CODE_REQUEST, id);
- if (req == NULL) {
- wpa_printf(MSG_ERROR, "EAP-WSC: Failed to allocate memory for "
- "request");
- return NULL;
- }
-
- wpabuf_put_u8(req, data->out_op_code); /* Op-Code */
- wpabuf_put_u8(req, flags); /* Flags */
- if (flags & WSC_FLAGS_LF)
- wpabuf_put_be16(req, wpabuf_len(data->out_buf));
-
- wpabuf_put_data(req, wpabuf_head_u8(data->out_buf) + data->out_used,
- send_len);
- data->out_used += send_len;
-
- 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;
- 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 req;
-}
-
-
-static struct wpabuf * eap_wsc_buildReq(struct eap_sm *sm, void *priv, u8 id)
-{
- struct eap_wsc_data *data = priv;
-
- switch (data->state) {
- case START:
- return eap_wsc_build_start(sm, data, id);
- case MESG:
- 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");
- return NULL;
- }
- data->out_used = 0;
- }
- /* pass through */
- case WAIT_FRAG_ACK:
- return eap_wsc_build_msg(data, id);
- case FRAG_ACK:
- return eap_wsc_build_frag_ack(id, EAP_CODE_REQUEST);
- default:
- wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected state %d in "
- "buildReq", data->state);
- return NULL;
- }
-}
-
-
-static Boolean eap_wsc_check(struct eap_sm *sm, void *priv,
- struct wpabuf *respData)
-{
- const u8 *pos;
- size_t len;
-
- pos = eap_hdr_validate(EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC,
- respData, &len);
- if (pos == NULL || len < 2) {
- wpa_printf(MSG_INFO, "EAP-WSC: Invalid frame");
- return TRUE;
- }
-
- return FALSE;
-}
-
-
-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);
- eap_wsc_state(data, FAIL);
- 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 int eap_wsc_process_fragment(struct eap_wsc_data *data,
- 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");
- return -1;
- }
-
- 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");
- return -1;
- }
- 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 0;
-}
-
-
-static void eap_wsc_process(struct eap_sm *sm, void *priv,
- struct wpabuf *respData)
-{
- struct eap_wsc_data *data = priv;
- const u8 *start, *pos, *end;
- size_t len;
- u8 op_code, flags;
- u16 message_length = 0;
- enum wps_process_res res;
- struct wpabuf tmpbuf;
-
- eloop_cancel_timeout(eap_wsc_ext_reg_timeout, sm, data);
- if (data->ext_reg_timeout) {
- eap_wsc_state(data, FAIL);
- return;
- }
-
- pos = eap_hdr_validate(EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC,
- respData, &len);
- if (pos == NULL || len < 2)
- return; /* Should not happen; message already verified */
-
- 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");
- return;
- }
- message_length = WPA_GET_BE16(pos);
- pos += 2;
-
- if (message_length < end - pos) {
- wpa_printf(MSG_DEBUG, "EAP-WSC: Invalid Message "
- "Length");
- return;
- }
- }
-
- 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);
- eap_wsc_state(data, FAIL);
- return;
- }
- wpa_printf(MSG_DEBUG, "EAP-WSC: Fragment acknowledged");
- eap_wsc_state(data, MESG);
- return;
- }
-
- if (op_code != WSC_ACK && op_code != WSC_NACK && op_code != WSC_MSG &&
- op_code != WSC_Done) {
- wpa_printf(MSG_DEBUG, "EAP-WSC: Unexpected Op-Code %d",
- op_code);
- eap_wsc_state(data, FAIL);
- return;
- }
-
- if (data->in_buf &&
- eap_wsc_process_cont(data, pos, end - pos, op_code) < 0) {
- eap_wsc_state(data, FAIL);
- return;
- }
-
- if (flags & WSC_FLAGS_MF) {
- if (eap_wsc_process_fragment(data, flags, op_code,
- message_length, pos, end - pos) <
- 0)
- eap_wsc_state(data, FAIL);
- else
- eap_wsc_state(data, FRAG_ACK);
- return;
- }
-
- 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 - report EAP failure");
- eap_wsc_state(data, FAIL);
- break;
- case WPS_CONTINUE:
- eap_wsc_state(data, MESG);
- break;
- case WPS_FAILURE:
- wpa_printf(MSG_DEBUG, "EAP-WSC: WPS processing failed");
- eap_wsc_state(data, FAIL);
- break;
- case WPS_PENDING:
- eap_wsc_state(data, MESG);
- sm->method_pending = METHOD_PENDING_WAIT;
- eloop_cancel_timeout(eap_wsc_ext_reg_timeout, sm, data);
- eloop_register_timeout(5, 0, eap_wsc_ext_reg_timeout,
- sm, data);
- break;
- }
-
- if (data->in_buf != &tmpbuf)
- wpabuf_free(data->in_buf);
- data->in_buf = NULL;
-}
-
-
-static Boolean eap_wsc_isDone(struct eap_sm *sm, void *priv)
-{
- struct eap_wsc_data *data = priv;
- return data->state == FAIL;
-}
-
-
-static Boolean eap_wsc_isSuccess(struct eap_sm *sm, void *priv)
-{
- /* EAP-WSC will always result in EAP-Failure */
- return FALSE;
-}
-
-
-static int eap_wsc_getTimeout(struct eap_sm *sm, void *priv)
-{
- /* Recommended retransmit times: retransmit timeout 5 seconds,
- * per-message timeout 15 seconds, i.e., 3 tries. */
- sm->MaxRetrans = 2; /* total 3 attempts */
- return 5;
-}
-
-
-int eap_server_wsc_register(void)
-{
- struct eap_method *eap;
- int ret;
-
- eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
- EAP_VENDOR_WFA, EAP_VENDOR_TYPE_WSC,
- "WSC");
- if (eap == NULL)
- return -1;
-
- eap->init = eap_wsc_init;
- eap->reset = eap_wsc_reset;
- eap->buildReq = eap_wsc_buildReq;
- eap->check = eap_wsc_check;
- eap->process = eap_wsc_process;
- eap->isDone = eap_wsc_isDone;
- eap->isSuccess = eap_wsc_isSuccess;
- eap->getTimeout = eap_wsc_getTimeout;
-
- ret = eap_server_method_register(eap);
- if (ret)
- eap_server_method_free(eap);
- return ret;
-}
projects / mech_eap.git / blobdiff