2015-07-15 19:52:23 +02:00
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/*
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*
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* Wireless daemon for Linux
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*
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* Copyright (C) 2015 Intel Corporation. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdbool.h>
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2015-07-17 21:52:46 +02:00
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#include <stdarg.h>
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#include <errno.h>
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2015-07-15 19:52:23 +02:00
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#include <ell/ell.h>
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#include "wsc.h"
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2015-07-15 21:44:28 +02:00
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void wsc_wfa_ext_iter_init(struct wsc_wfa_ext_iter *iter,
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const unsigned char *pdu, unsigned short len)
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{
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iter->pdu = pdu;
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iter->max = len;
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iter->pos = 0;
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}
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bool wsc_wfa_ext_iter_next(struct wsc_wfa_ext_iter *iter)
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{
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const unsigned char *start = iter->pdu + iter->pos;
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const unsigned char *end = iter->pdu + iter->max;
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unsigned char type;
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unsigned char len;
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if (iter->pos + 2 >= iter->max)
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return false;
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type = *start;
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start += 1;
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len = *start;
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start += 1;
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if (start + len > end)
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return false;
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iter->type = type;
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iter->len = len;
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iter->data = start;
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iter->pos = start + len - iter->pdu;
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return true;
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}
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2015-07-15 19:52:23 +02:00
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void wsc_attr_iter_init(struct wsc_attr_iter *iter, const unsigned char *pdu,
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unsigned int len)
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{
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iter->pdu = pdu;
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iter->max = len;
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iter->pos = 0;
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}
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bool wsc_attr_iter_next(struct wsc_attr_iter *iter)
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{
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const unsigned char *start = iter->pdu + iter->pos;
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const unsigned char *end = iter->pdu + iter->max;
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unsigned short type;
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unsigned short len;
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/* Make sure we have at least type + len fields */
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if (iter->pos + 4 >= iter->max)
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return false;
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type = l_get_be16(start);
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start += 2;
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len = l_get_be16(start);
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start += 2;
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if (start + len > end)
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return false;
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iter->type = type;
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iter->len = len;
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iter->data = start;
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iter->pos = start + len - iter->pdu;
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return true;
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}
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2015-07-15 21:44:28 +02:00
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bool wsc_attr_iter_recurse_wfa_ext(struct wsc_attr_iter *iter,
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struct wsc_wfa_ext_iter *wfa_iter)
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{
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static const unsigned char wfa_ext[3] = { 0x00, 0x37, 0x2a };
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if (iter->type != WSC_ATTR_VENDOR_EXTENSION)
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return false;
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if (iter->len < 3)
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return false;
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if (memcmp(iter->data, wfa_ext, sizeof(wfa_ext)))
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return false;
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wsc_wfa_ext_iter_init(wfa_iter, iter->data + 3, iter->len - 3);
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return true;
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}
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2015-07-17 21:52:46 +02:00
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enum attr_flag {
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ATTR_FLAG_REQUIRED, /* Always required */
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ATTR_FLAG_VERSION2, /* Included if Version2 is present */
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ATTR_FLAG_REGISTRAR, /* Included if Selected Registrar is true */
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};
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typedef bool (*attr_handler)(struct wsc_attr_iter *, void *);
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2015-07-17 21:53:21 +02:00
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static bool extract_uint8(struct wsc_attr_iter *iter, void *data)
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{
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uint8_t *to = data;
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if (wsc_attr_iter_get_length(iter) != 1)
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return false;
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*to = *wsc_attr_iter_get_data(iter);
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return true;
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}
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static bool extract_uint16(struct wsc_attr_iter *iter, void *data)
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{
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uint16_t *to = data;
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if (wsc_attr_iter_get_length(iter) != 2)
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return false;
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*to = l_get_be16(wsc_attr_iter_get_data(iter));
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return true;
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}
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static bool extract_bool(struct wsc_attr_iter *iter, void *data)
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{
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bool *to = data;
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if (wsc_attr_iter_get_length(iter) != 1)
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return false;
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*to = *wsc_attr_iter_get_data(iter) ? true : false;
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return true;
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}
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static bool extract_ascii_string(struct wsc_attr_iter *iter, void *data,
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unsigned int max_len)
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{
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char *out = data;
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const uint8_t *p;
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unsigned int len;
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unsigned int i;
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len = wsc_attr_iter_get_length(iter);
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if (len > max_len)
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return false;
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p = wsc_attr_iter_get_data(iter);
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for (i = 0; i < len; i++) {
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if (!p[i])
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break;
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if (!l_ascii_isprint(p[i]))
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return false;
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}
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memcpy(out, p, i);
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out[i] = '\0';
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return true;
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}
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static bool extract_utf8_string(struct wsc_attr_iter *iter, void *data,
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unsigned int max_len)
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{
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char *out = data;
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const uint8_t *p;
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unsigned int len;
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unsigned int i;
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len = wsc_attr_iter_get_length(iter);
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if (len > max_len)
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return false;
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p = wsc_attr_iter_get_data(iter);
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for (i = 0; i < len; i++) {
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if (!p[i])
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break;
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}
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2015-07-19 18:44:40 +02:00
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if (!l_utf8_validate((const char *) p, i, NULL))
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2015-07-17 21:53:21 +02:00
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return false;
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memcpy(out, p, i);
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out[i] = '\0';
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return true;
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}
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static bool extract_device_name(struct wsc_attr_iter *iter, void *data)
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{
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return extract_utf8_string(iter, data, 32);
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}
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static bool extract_device_password_id(struct wsc_attr_iter *iter, void *data)
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{
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uint16_t v;
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enum wsc_device_password_id *out = data;
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if (wsc_attr_iter_get_length(iter) != 2)
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return false;
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v = l_get_be16(wsc_attr_iter_get_data(iter));
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if (v > 0x0008)
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return false;
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*out = v;
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return true;
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}
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static bool extract_manufacturer(struct wsc_attr_iter *iter, void *data)
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{
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return extract_ascii_string(iter, data, 64);
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}
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static bool extract_model_name(struct wsc_attr_iter *iter, void *data)
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{
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return extract_ascii_string(iter, data, 32);
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}
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static bool extract_model_number(struct wsc_attr_iter *iter, void *data)
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{
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return extract_ascii_string(iter, data, 32);
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}
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static bool extract_primary_device_type(struct wsc_attr_iter *iter, void *data)
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{
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struct wsc_primary_device_type *out = data;
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const uint8_t *p;
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uint16_t category;
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if (wsc_attr_iter_get_length(iter) != 8)
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return false;
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p = wsc_attr_iter_get_data(iter);
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category = l_get_be16(p);
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if (category > 12 && category != 255)
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return false;
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out->category = category;
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memcpy(out->oui, p + 2, 3);
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out->oui_type = p[5];
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out->subcategory = l_get_be16(p + 6);
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return true;
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}
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static bool extract_response_type(struct wsc_attr_iter *iter, void *data)
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{
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enum wsc_response_type *out = data;
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uint8_t rt;
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if (!extract_uint8(iter, &rt))
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return false;
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/* WSC 2.0.5: Table 43 */
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if (rt > 3)
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return false;
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*out = rt;
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return true;
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}
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static bool extract_serial_number(struct wsc_attr_iter *iter, void *data)
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{
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return extract_ascii_string(iter, data, 32);
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}
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static bool extract_version(struct wsc_attr_iter *iter, void *data)
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{
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uint8_t *out = data;
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uint8_t v;
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if (!extract_uint8(iter, &v))
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return false;
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/*
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* "This attribute is always set to value 0x10 (version 1.0)
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* for backwards compatibility"
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*/
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if (v != 0x10)
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return false;
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*out = v;
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return true;
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}
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static bool extract_wsc_state(struct wsc_attr_iter *iter, void *data)
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{
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uint8_t *out = data;
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uint8_t st;
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if (!extract_uint8(iter, &st))
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return false;
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if (st < 1 || st > 2)
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return false;
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*out = st;
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return true;
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}
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static bool extract_uuid(struct wsc_attr_iter *iter, void *data)
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{
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uint8_t *out = data;
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if (wsc_attr_iter_get_length(iter) != 16)
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return false;
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memcpy(out, wsc_attr_iter_get_data(iter), 16);
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return true;
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}
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2015-07-17 21:52:46 +02:00
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static attr_handler handler_for_type(enum wsc_attr type)
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{
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switch (type) {
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2015-07-17 21:53:21 +02:00
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case WSC_ATTR_AP_SETUP_LOCKED:
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return extract_bool;
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case WSC_ATTR_CONFIGURATION_METHODS:
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return extract_uint16;
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case WSC_ATTR_DEVICE_NAME:
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return extract_device_name;
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case WSC_ATTR_DEVICE_PASSWORD_ID:
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return extract_device_password_id;
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case WSC_ATTR_MANUFACTURER:
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return extract_manufacturer;
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case WSC_ATTR_MODEL_NAME:
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return extract_model_name;
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case WSC_ATTR_MODEL_NUMBER:
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return extract_model_number;
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case WSC_ATTR_PRIMARY_DEVICE_TYPE:
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return extract_primary_device_type;
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case WSC_ATTR_RF_BANDS:
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return extract_uint8;
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case WSC_ATTR_RESPONSE_TYPE:
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return extract_response_type;
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case WSC_ATTR_SELECTED_REGISTRAR:
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return extract_bool;
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case WSC_ATTR_SELECTED_REGISTRAR_CONFIGURATION_METHODS:
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return extract_uint16;
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case WSC_ATTR_SERIAL_NUMBER:
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return extract_serial_number;
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case WSC_ATTR_VERSION:
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return extract_version;
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case WSC_ATTR_WSC_STATE:
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return extract_wsc_state;
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case WSC_ATTR_UUID_E:
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return extract_uuid;
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2015-07-17 21:52:46 +02:00
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default:
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break;
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}
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return NULL;
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}
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struct attr_handler_entry {
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enum wsc_attr type;
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unsigned int flags;
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void *data;
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bool present;
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};
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static bool verify_version2(struct wsc_wfa_ext_iter *ext_iter)
|
|
|
|
{
|
|
|
|
if (!wsc_wfa_ext_iter_next(ext_iter))
|
|
|
|
return false;
|
|
|
|
|
|
|
|
if (wsc_wfa_ext_iter_get_type(ext_iter) != WSC_WFA_EXTENSION_VERSION2)
|
|
|
|
return false;
|
|
|
|
|
|
|
|
if (wsc_wfa_ext_iter_get_length(ext_iter) != 1)
|
|
|
|
return false;
|
|
|
|
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int wsc_parse_attrs(const unsigned char *pdu, unsigned int len,
|
|
|
|
bool *out_version2,
|
|
|
|
struct wsc_wfa_ext_iter *ext_iter,
|
|
|
|
enum wsc_attr type, ...)
|
|
|
|
{
|
|
|
|
struct wsc_attr_iter iter;
|
|
|
|
struct l_queue *entries;
|
|
|
|
const struct l_queue_entry *e;
|
|
|
|
va_list args;
|
|
|
|
bool version2 = false;
|
2015-07-23 23:42:56 +02:00
|
|
|
bool sr = false;
|
2015-07-17 21:52:46 +02:00
|
|
|
bool have_required = true;
|
|
|
|
bool parse_error = false;
|
|
|
|
|
|
|
|
wsc_attr_iter_init(&iter, pdu, len);
|
|
|
|
|
|
|
|
va_start(args, type);
|
|
|
|
|
|
|
|
entries = l_queue_new();
|
|
|
|
|
|
|
|
while (type != WSC_ATTR_INVALID) {
|
|
|
|
struct attr_handler_entry *entry;
|
|
|
|
|
|
|
|
entry = l_new(struct attr_handler_entry, 1);
|
|
|
|
|
|
|
|
entry->type = type;
|
|
|
|
entry->flags = va_arg(args, unsigned int);
|
|
|
|
entry->data = va_arg(args, void *);
|
|
|
|
|
|
|
|
type = va_arg(args, enum wsc_attr);
|
|
|
|
l_queue_push_tail(entries, entry);
|
|
|
|
}
|
|
|
|
|
|
|
|
va_end(args);
|
|
|
|
e = l_queue_get_entries(entries);
|
|
|
|
|
|
|
|
while (wsc_attr_iter_next(&iter)) {
|
|
|
|
attr_handler handler;
|
|
|
|
struct attr_handler_entry *entry;
|
|
|
|
const struct l_queue_entry *e2;
|
|
|
|
|
|
|
|
for (e2 = e; e2; e2 = e2->next) {
|
|
|
|
entry = e2->data;
|
|
|
|
|
|
|
|
if (wsc_attr_iter_get_type(&iter) == entry->type) {
|
|
|
|
entry->present = true;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (entry->flags & ATTR_FLAG_REQUIRED) {
|
|
|
|
have_required = false;
|
|
|
|
goto done;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (e2 == NULL) {
|
|
|
|
if (wsc_attr_iter_get_type(&iter)
|
|
|
|
!= WSC_ATTR_VENDOR_EXTENSION)
|
|
|
|
break;
|
|
|
|
|
|
|
|
if (!wsc_attr_iter_recurse_wfa_ext(&iter, ext_iter))
|
|
|
|
break;
|
|
|
|
|
|
|
|
if (!verify_version2(ext_iter)) {
|
|
|
|
parse_error = true;
|
|
|
|
goto done;
|
|
|
|
}
|
|
|
|
|
|
|
|
version2 = true;
|
|
|
|
goto check;
|
|
|
|
}
|
|
|
|
|
2015-07-23 23:42:56 +02:00
|
|
|
if (entry->type == WSC_ATTR_SELECTED_REGISTRAR)
|
|
|
|
sr = true;
|
|
|
|
|
2015-07-17 21:52:46 +02:00
|
|
|
handler = handler_for_type(entry->type);
|
|
|
|
|
|
|
|
if (!handler(&iter, entry->data)) {
|
|
|
|
parse_error = true;
|
|
|
|
goto done;
|
|
|
|
}
|
|
|
|
|
|
|
|
e = e2->next;
|
|
|
|
}
|
|
|
|
|
|
|
|
for (; e; e = e->next) {
|
|
|
|
struct attr_handler_entry *entry = e->data;
|
|
|
|
|
|
|
|
if (entry->flags & ATTR_FLAG_REQUIRED)
|
|
|
|
parse_error = true;
|
|
|
|
}
|
|
|
|
|
|
|
|
check:
|
|
|
|
if (version2) {
|
|
|
|
struct attr_handler_entry *entry;
|
|
|
|
|
|
|
|
for (e = l_queue_get_entries(entries); e; e = e->next) {
|
|
|
|
entry = e->data;
|
|
|
|
|
|
|
|
if (!(entry->flags & ATTR_FLAG_VERSION2))
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if (entry->present)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
parse_error = true;
|
|
|
|
goto done;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-07-23 23:42:56 +02:00
|
|
|
/*
|
|
|
|
* If Selected Registrar is present and true, then certain attributes
|
|
|
|
* must also be present.
|
|
|
|
*/
|
|
|
|
if (sr) {
|
|
|
|
struct attr_handler_entry *entry;
|
|
|
|
|
|
|
|
for (e = l_queue_get_entries(entries); e; e = e->next) {
|
|
|
|
entry = e->data;
|
|
|
|
|
|
|
|
if (!(entry->flags & ATTR_FLAG_REGISTRAR))
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if (entry->present)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
parse_error = true;
|
|
|
|
goto done;
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
2015-07-17 21:52:46 +02:00
|
|
|
|
|
|
|
done:
|
|
|
|
l_queue_destroy(entries, l_free);
|
|
|
|
|
|
|
|
if (!have_required)
|
|
|
|
return -EINVAL;
|
|
|
|
if (parse_error)
|
|
|
|
return -EBADMSG;
|
|
|
|
|
|
|
|
*out_version2 = version2;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
2015-07-17 21:53:48 +02:00
|
|
|
|
|
|
|
int wsc_parse_probe_response(const unsigned char *pdu, unsigned int len,
|
|
|
|
struct wsc_probe_response *out)
|
|
|
|
{
|
|
|
|
int r;
|
|
|
|
struct wsc_wfa_ext_iter iter;
|
|
|
|
uint8_t version;
|
|
|
|
|
|
|
|
memset(out, 0, sizeof(struct wsc_probe_response));
|
|
|
|
|
|
|
|
r = wsc_parse_attrs(pdu, len, &out->version2, &iter,
|
|
|
|
WSC_ATTR_VERSION, ATTR_FLAG_REQUIRED, &version,
|
|
|
|
WSC_ATTR_WSC_STATE, ATTR_FLAG_REQUIRED, &out->config_state,
|
|
|
|
WSC_ATTR_AP_SETUP_LOCKED, 0, &out->ap_setup_locked,
|
|
|
|
WSC_ATTR_SELECTED_REGISTRAR, 0, &out->selected_registrar,
|
|
|
|
WSC_ATTR_DEVICE_PASSWORD_ID,
|
|
|
|
ATTR_FLAG_REGISTRAR, &out->device_password_id,
|
|
|
|
WSC_ATTR_SELECTED_REGISTRAR_CONFIGURATION_METHODS,
|
|
|
|
ATTR_FLAG_REGISTRAR, &out->selected_reg_config_methods,
|
|
|
|
WSC_ATTR_RESPONSE_TYPE, ATTR_FLAG_REQUIRED, &out->response_type,
|
|
|
|
WSC_ATTR_UUID_E, ATTR_FLAG_REQUIRED, &out->uuid_e,
|
|
|
|
WSC_ATTR_MANUFACTURER, ATTR_FLAG_REQUIRED, &out->manufacturer,
|
|
|
|
WSC_ATTR_MODEL_NAME, ATTR_FLAG_REQUIRED, &out->model_name,
|
|
|
|
WSC_ATTR_MODEL_NUMBER, ATTR_FLAG_REQUIRED, &out->model_number,
|
|
|
|
WSC_ATTR_SERIAL_NUMBER, ATTR_FLAG_REQUIRED, &out->serial_number,
|
|
|
|
WSC_ATTR_PRIMARY_DEVICE_TYPE,
|
|
|
|
ATTR_FLAG_REQUIRED, &out->primary_device_type,
|
|
|
|
WSC_ATTR_DEVICE_NAME, ATTR_FLAG_REQUIRED, &out->device_name,
|
|
|
|
WSC_ATTR_CONFIGURATION_METHODS,
|
|
|
|
ATTR_FLAG_REQUIRED, &out->config_methods,
|
|
|
|
WSC_ATTR_RF_BANDS, 0, &out->rf_bands,
|
|
|
|
WSC_ATTR_INVALID);
|
|
|
|
|
|
|
|
if (r < 0)
|
|
|
|
return r;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|