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WPS: Add a standalone tool for building NFC password tokens

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nfc_pw_token can be used to build random NFC password token for WPS.
This tool prints out the wpa_supplicant.conf (or hostapd.conf)
parameters and the hexdump of the WPS password token (with and without
NDEF encapsulation) so that it can be written to a NFC tag with an
external program.

Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2012-06-28 20:42:50 +03:00
parent 72df0cd28c
commit 40a5e3bfde
2 changed files with 92 additions and 0 deletions
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9
wpa_supplicant/Makefile
View file

@ -1366,6 +1366,10 @@ ifndef CONFIG_AP
OBJS_t += ../src/utils/ip_addr.o
endif
OBJS_t2 := $(OBJS) $(OBJS_l2) preauth_test.o
OBJS_nfc := $(OBJS) $(OBJS_l2) nfc_pw_token.o
OBJS_nfc += $(OBJS_d) ../src/drivers/drivers.o
OBJS += $(CONFIG_MAIN).o
ifdef CONFIG_PRIVSEP
@ -1474,6 +1478,10 @@ test_wpa: $(OBJS_wpa) $(OBJS_h)
$(Q)$(LDO) $(LDFLAGS) -o test_wpa $(OBJS_wpa) $(LIBS)
@$(E) " LD " $@
nfc_pw_token: $(OBJS_nfc)
$(Q)$(LDO) $(LDFLAGS) -o nfc_pw_token $(OBJS_nfc) $(LIBS)
@$(E) " LD " $@
win_if_list: win_if_list.c
$(Q)$(LDO) $(LDFLAGS) -o $@ win_if_list.c $(CFLAGS) $(LIBS_w)
@$(E) " LD " $@
@ -1556,5 +1564,6 @@ clean:
$(MAKE) -C dbus clean
rm -f core *~ *.o *.d eap_*.so $(ALL) $(WINALL) eapol_test preauth_test
rm -f wpa_priv
rm -f nfc_pw_token
-include $(OBJS:%.o=%.d)

83
wpa_supplicant/nfc_pw_token.c Normal file
View file

@ -0,0 +1,83 @@
/*
* nfc_pw_token - Tool for building NFC password tokens for WPS
* Copyright (c) 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 "utils/common.h"
#include "crypto/random.h"
#include "wpa_supplicant_i.h"
#include "config.h"
#include "wps_supplicant.h"
static void print_bin(const char *title, const struct wpabuf *buf)
{
size_t i, len;
const u8 *pos;
if (buf == NULL)
return;
printf("%s=", title);
pos = wpabuf_head(buf);
len = wpabuf_len(buf);
for (i = 0; i < len; i++)
printf("%02X", *pos++);
printf("\n");
}
int main(int argc, char *argv[])
{
struct wpa_supplicant wpa_s;
int ret = -1;
struct wpabuf *buf = NULL, *ndef = NULL;
char txt[1000];
if (os_program_init())
return -1;
random_init(NULL);
os_memset(&wpa_s, 0, sizeof(wpa_s));
wpa_s.conf = os_zalloc(sizeof(*wpa_s.conf));
if (wpa_s.conf == NULL)
goto fail;
buf = wpas_wps_nfc_token(&wpa_s, 0);
if (buf == NULL)
goto fail;
ndef = ndef_build_wifi(buf);
if (ndef == NULL)
goto fail;
wpa_snprintf_hex_uppercase(txt, sizeof(txt), wpabuf_head(buf),
wpabuf_len(buf));
printf("#WPS=%s\n", txt);
wpa_snprintf_hex_uppercase(txt, sizeof(txt), wpabuf_head(ndef),
wpabuf_len(ndef));
printf("#NDEF=%s\n", txt);
printf("wps_nfc_dev_pw_id=%d\n", wpa_s.conf->wps_nfc_dev_pw_id);
print_bin("wps_nfc_dh_pubkey", wpa_s.conf->wps_nfc_dh_pubkey);
print_bin("wps_nfc_dh_privkey", wpa_s.conf->wps_nfc_dh_privkey);
print_bin("wps_nfc_dev_pw", wpa_s.conf->wps_nfc_dev_pw);
ret = 0;
fail:
wpabuf_free(ndef);
wpabuf_free(buf);
wpa_config_free(wpa_s.conf);
random_deinit();
os_program_deinit();
return ret;
}