hostap/wpa_supplicant/dpp_supplicant.c

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/*
* wpa_supplicant - DPP
* Copyright (c) 2017, Qualcomm Atheros, Inc.
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "utils/includes.h"
#include "utils/common.h"
#include "common/dpp.h"
#include "wpa_supplicant_i.h"
#include "dpp_supplicant.h"
static unsigned int wpas_dpp_next_id(struct wpa_supplicant *wpa_s)
{
struct dpp_bootstrap_info *bi;
unsigned int max_id = 0;
dl_list_for_each(bi, &wpa_s->dpp_bootstrap, struct dpp_bootstrap_info,
list) {
if (bi->id > max_id)
max_id = bi->id;
}
return max_id + 1;
}
/**
* wpas_dpp_qr_code - Parse and add DPP bootstrapping info from a QR Code
* @wpa_s: Pointer to wpa_supplicant data
* @cmd: DPP URI read from a QR Code
* Returns: Identifier of the stored info or -1 on failure
*/
int wpas_dpp_qr_code(struct wpa_supplicant *wpa_s, const char *cmd)
{
struct dpp_bootstrap_info *bi;
bi = dpp_parse_qr_code(cmd);
if (!bi)
return -1;
bi->id = wpas_dpp_next_id(wpa_s);
dl_list_add(&wpa_s->dpp_bootstrap, &bi->list);
return bi->id;
}
static char * get_param(const char *cmd, const char *param)
{
const char *pos, *end;
char *val;
size_t len;
pos = os_strstr(cmd, param);
if (!pos)
return NULL;
pos += os_strlen(param);
end = os_strchr(pos, ' ');
if (end)
len = end - pos;
else
len = os_strlen(pos);
val = os_malloc(len + 1);
if (!val)
return NULL;
os_memcpy(val, pos, len);
val[len] = '\0';
return val;
}
int wpas_dpp_bootstrap_gen(struct wpa_supplicant *wpa_s, const char *cmd)
{
char *chan = NULL, *mac = NULL, *info = NULL, *pk = NULL, *curve = NULL;
char *key = NULL;
u8 *privkey = NULL;
size_t privkey_len = 0;
size_t len;
int ret = -1;
struct dpp_bootstrap_info *bi;
bi = os_zalloc(sizeof(*bi));
if (!bi)
goto fail;
if (os_strstr(cmd, "type=qrcode"))
bi->type = DPP_BOOTSTRAP_QR_CODE;
else
goto fail;
chan = get_param(cmd, " chan=");
mac = get_param(cmd, " mac=");
info = get_param(cmd, " info=");
curve = get_param(cmd, " curve=");
key = get_param(cmd, " key=");
if (key) {
privkey_len = os_strlen(key) / 2;
privkey = os_malloc(privkey_len);
if (!privkey ||
hexstr2bin(key, privkey, privkey_len) < 0)
goto fail;
}
pk = dpp_keygen(bi, curve, privkey, privkey_len);
if (!pk)
goto fail;
len = 4; /* "DPP:" */
if (chan) {
if (dpp_parse_uri_chan_list(bi, chan) < 0)
goto fail;
len += 3 + os_strlen(chan); /* C:...; */
}
if (mac) {
if (dpp_parse_uri_mac(bi, mac) < 0)
goto fail;
len += 3 + os_strlen(mac); /* M:...; */
}
if (info) {
if (dpp_parse_uri_info(bi, info) < 0)
goto fail;
len += 3 + os_strlen(info); /* I:...; */
}
len += 4 + os_strlen(pk);
bi->uri = os_malloc(len + 1);
if (!bi->uri)
goto fail;
os_snprintf(bi->uri, len + 1, "DPP:%s%s%s%s%s%s%s%s%sK:%s;;",
chan ? "C:" : "", chan ? chan : "", chan ? ";" : "",
mac ? "M:" : "", mac ? mac : "", mac ? ";" : "",
info ? "I:" : "", info ? info : "", info ? ";" : "",
pk);
bi->id = wpas_dpp_next_id(wpa_s);
dl_list_add(&wpa_s->dpp_bootstrap, &bi->list);
ret = bi->id;
bi = NULL;
fail:
os_free(curve);
os_free(pk);
os_free(chan);
os_free(mac);
os_free(info);
str_clear_free(key);
bin_clear_free(privkey, privkey_len);
dpp_bootstrap_info_free(bi);
return ret;
}
static struct dpp_bootstrap_info *
dpp_bootstrap_get_id(struct wpa_supplicant *wpa_s, unsigned int id)
{
struct dpp_bootstrap_info *bi;
dl_list_for_each(bi, &wpa_s->dpp_bootstrap, struct dpp_bootstrap_info,
list) {
if (bi->id == id)
return bi;
}
return NULL;
}
static int dpp_bootstrap_del(struct wpa_supplicant *wpa_s, unsigned int id)
{
struct dpp_bootstrap_info *bi, *tmp;
int found = 0;
dl_list_for_each_safe(bi, tmp, &wpa_s->dpp_bootstrap,
struct dpp_bootstrap_info, list) {
if (id && bi->id != id)
continue;
found = 1;
dl_list_del(&bi->list);
dpp_bootstrap_info_free(bi);
}
if (id == 0)
return 0; /* flush succeeds regardless of entries found */
return found ? 0 : -1;
}
int wpas_dpp_bootstrap_remove(struct wpa_supplicant *wpa_s, const char *id)
{
unsigned int id_val;
if (os_strcmp(id, "*") == 0) {
id_val = 0;
} else {
id_val = atoi(id);
if (id_val == 0)
return -1;
}
return dpp_bootstrap_del(wpa_s, id_val);
}
const char * wpas_dpp_bootstrap_get_uri(struct wpa_supplicant *wpa_s,
unsigned int id)
{
struct dpp_bootstrap_info *bi;
bi = dpp_bootstrap_get_id(wpa_s, id);
if (!bi)
return NULL;
return bi->uri;
}
int wpas_dpp_init(struct wpa_supplicant *wpa_s)
{
dl_list_init(&wpa_s->dpp_bootstrap);
wpa_s->dpp_init_done = 1;
return 0;
}
void wpas_dpp_deinit(struct wpa_supplicant *wpa_s)
{
if (!wpa_s->dpp_init_done)
return;
dpp_bootstrap_del(wpa_s, 0);
}