X-Git-Url: http://www.project-moonshot.org/gitweb/?a=blobdiff_plain;f=libeap%2Fsrc%2Feap_peer%2Feap_wsc.c;fp=libeap%2Fsrc%2Feap_peer%2Feap_wsc.c;h=09d8a1c8a1b7b7de6908ea8f1aca9c222a4c9e1a;hb=fa210a112d16848a282d662f16f9b8589dd371df;hp=0000000000000000000000000000000000000000;hpb=a3d666260a9b578b9ad6f7ffd15671530ec632d9;p=mech_eap.orig

diff --git a/libeap/src/eap_peer/eap_wsc.c b/libeap/src/eap_peer/eap_wsc.c
new file mode 100644
index 0000000..09d8a1c
--- /dev/null
+++ b/libeap/src/eap_peer/eap_wsc.c
@@ -0,0 +1,553 @@
+/*
+ * EAP-WSC peer for Wi-Fi Protected Setup
+ * Copyright (c) 2007-2009, 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 "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, 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;
+	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 FRAG_ACK:
+		return "FRAG_ACK";
+	case WAIT_FRAG_ACK:
+		return "WAIT_FRAG_ACK";
+	case DONE:
+		return "DONE";
+	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))
+		return -1;
+	cred->ssid_len = len / 2;
+
+	pos = os_strstr(params, "new_auth=");
+	if (pos == NULL)
+		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
+		return -1;
+
+	pos = os_strstr(params, "new_encr=");
+	if (pos == NULL)
+		return -1;
+	if (os_strncmp(pos + 9, "NONE", 4) == 0)
+		cred->encr_type = WPS_ENCR_NONE;
+	else if (os_strncmp(pos + 9, "WEP", 3) == 0)
+		cred->encr_type = WPS_ENCR_WEP;
+	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
+		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))
+		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;
+	const char *phase1;
+	struct wps_context *wps;
+	struct wps_credential new_ap_settings;
+	int res;
+
+	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;
+	} else {
+		pos = os_strstr(phase1, "pbc=1");
+		if (pos)
+			cfg.pbc = 1;
+	}
+
+	if (cfg.pin == NULL && !cfg.pbc) {
+		wpa_printf(MSG_INFO, "EAP-WSC: PIN or PBC not set in phase1 "
+			   "configuration data");
+		os_free(data);
+		return NULL;
+	}
+
+	pos = os_strstr(phase1, "dev_pw_id=");
+	if (pos && cfg.pin)
+		cfg.dev_pw_id = atoi(pos + 10);
+
+	res = eap_wsc_new_ap_settings(&new_ap_settings, phase1);
+	if (res < 0) {
+		os_free(data);
+		return NULL;
+	}
+	if (res == 1) {
+		wpa_printf(MSG_DEBUG, "EAP-WSC: Provide new AP settings for "
+			   "WPS");
+		cfg.new_ap_settings = &new_ap_settings;
+	}
+
+	data->wps = wps_init(&cfg);
+	if (data->wps == NULL) {
+		os_free(data);
+		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) {
+			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");
+			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;
+	int ret;
+
+	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;
+
+	ret = eap_peer_method_register(eap);
+	if (ret)
+		eap_peer_method_free(eap);
+	return ret;
+}