WPS ER: Add support for building NFC configuration token

WPS_ER_NFC_CONFIG_TOKEN command can now be used to build a NFC
configuration token based on AP Settings learnt with WPS_ER_LEARN
or set with WPS_ER_CONFIG.

Signed-hostap: Jouni Malinen <j@w1.fi>

src/wps/wps.h

@@ -835,6 +835,7 @@ int wps_er_set_config(struct wps_er *er, const u8 *uuid,
 		      const struct wps_credential *cred);
 int wps_er_config(struct wps_er *er, const u8 *uuid, const u8 *pin,
 		  size_t pin_len, const struct wps_credential *cred);
+struct wpabuf * wps_er_nfc_config_token(struct wps_er *er, const u8 *uuid);
 
 int wps_dev_type_str2bin(const char *str, u8 dev_type[WPS_DEV_TYPE_LEN]);
 char * wps_dev_type_bin2str(const u8 dev_type[WPS_DEV_TYPE_LEN], char *buf,

src/wps/wps_er.c

@@ -1,6 +1,6 @@
 /*
  * Wi-Fi Protected Setup - External Registrar
- * Copyright (c) 2009, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2009-2012, Jouni Malinen <j@w1.fi>
  *
  * This software may be distributed under the terms of the BSD license.
  * See README for more details.
@@ -1996,3 +1996,41 @@ int wps_er_config(struct wps_er *er, const u8 *uuid, const u8 *pin,
 
 	return 0;
 }
+
+
+#ifdef CONFIG_WPS_NFC
+struct wpabuf * wps_er_nfc_config_token(struct wps_er *er, const u8 *uuid)
+{
+	struct wps_er_ap *ap;
+	struct wpabuf *ret;
+	struct wps_data data;
+
+	if (er == NULL)
+		return NULL;
+
+	ap = wps_er_ap_get(er, NULL, uuid);
+	if (ap == NULL)
+		return NULL;
+	if (ap->ap_settings == NULL) {
+		wpa_printf(MSG_DEBUG, "WPS ER: No settings known for the "
+			   "selected AP");
+		return NULL;
+	}
+
+	ret = wpabuf_alloc(500);
+	if (ret == NULL)
+		return NULL;
+
+	os_memset(&data, 0, sizeof(data));
+	data.wps = er->wps;
+	data.use_cred = ap->ap_settings;
+	if (wps_build_version(ret) ||
+	    wps_build_cred(&data, ret) ||
+	    wps_build_wfa_ext(ret, 0, NULL, 0)) {
+		wpabuf_free(ret);
+		return NULL;
+	}
+
+	return ret;
+}
+#endif /* CONFIG_WPS_NFC */

wpa_supplicant/ctrl_iface.c

@@ -1,6 +1,6 @@
 /*
  * WPA Supplicant / Control interface (shared code for all backends)
- * Copyright (c) 2004-2010, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2004-2012, Jouni Malinen <j@w1.fi>
  *
  * This software may be distributed under the terms of the BSD license.
  * See README for more details.
@@ -892,6 +892,43 @@ static int wpa_supplicant_ctrl_iface_wps_er_config(
 	ap.key_hex = new_key;
 	return wpas_wps_er_config(wpa_s, cmd, pin, &ap);
 }
+
+
+#ifdef CONFIG_WPS_NFC
+static int wpa_supplicant_ctrl_iface_wps_er_nfc_config_token(
+	struct wpa_supplicant *wpa_s, char *cmd, char *reply, size_t max_len)
+{
+	int ndef;
+	struct wpabuf *buf;
+	int res;
+	char *uuid;
+
+	uuid = os_strchr(cmd, ' ');
+	if (uuid == NULL)
+		return -1;
+	*uuid++ = '\0';
+
+	if (os_strcmp(cmd, "WPS") == 0)
+		ndef = 0;
+	else if (os_strcmp(cmd, "NDEF") == 0)
+		ndef = 1;
+	else
+		return -1;
+
+	buf = wpas_wps_er_nfc_config_token(wpa_s, ndef, uuid);
+	if (buf == NULL)
+		return -1;
+
+	res = wpa_snprintf_hex_uppercase(reply, max_len, wpabuf_head(buf),
+					 wpabuf_len(buf));
+	reply[res++] = '\n';
+	reply[res] = '\0';
+
+	wpabuf_free(buf);
+
+	return res;
+}
+#endif /* CONFIG_WPS_NFC */
 #endif /* CONFIG_WPS_ER */
 
 #endif /* CONFIG_WPS */
@@ -4182,6 +4219,11 @@ char * wpa_supplicant_ctrl_iface_process(struct wpa_supplicant *wpa_s,
 	} else if (os_strncmp(buf, "WPS_ER_CONFIG ", 14) == 0) {
 		if (wpa_supplicant_ctrl_iface_wps_er_config(wpa_s, buf + 14))
 			reply_len = -1;
+#ifdef CONFIG_WPS_NFC
+	} else if (os_strncmp(buf, "WPS_ER_NFC_CONFIG_TOKEN ", 24) == 0) {
+		reply_len = wpa_supplicant_ctrl_iface_wps_er_nfc_config_token(
+			wpa_s, buf + 24, reply, reply_size);
+#endif /* CONFIG_WPS_NFC */
 #endif /* CONFIG_WPS_ER */
 #endif /* CONFIG_WPS */
 #ifdef CONFIG_IBSS_RSN

wpa_supplicant/wpa_cli.c

@@ -1,6 +1,6 @@
 /*
  * WPA Supplicant - command line interface for wpa_supplicant daemon
- * Copyright (c) 2004-2011, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2004-2012, Jouni Malinen <j@w1.fi>
  *
  * This software may be distributed under the terms of the BSD license.
  * See README for more details.
@@ -1175,6 +1175,32 @@ static int wpa_cli_cmd_wps_er_config(struct wpa_ctrl *ctrl, int argc,
 }
 
 
+#ifdef CONFIG_WPS_NFC
+static int wpa_cli_cmd_wps_er_nfc_config_token(struct wpa_ctrl *ctrl, int argc,
+					       char *argv[])
+{
+	char cmd[256];
+	int res;
+
+	if (argc != 2) {
+		printf("Invalid WPS_ER_NFC_CONFIG_TOKEN command: need two "
+		       "arguments:\n"
+		       "- WPS/NDEF: token format\n"
+		       "- UUID: specify which AP to use\n");
+		return -1;
+	}
+
+	res = os_snprintf(cmd, sizeof(cmd), "WPS_ER_NFC_CONFIG_TOKEN %s %s",
+			  argv[0], argv[1]);
+	if (res < 0 || (size_t) res >= sizeof(cmd) - 1) {
+		printf("Too long WPS_ER_NFC_CONFIG_TOKEN command.\n");
+		return -1;
+	}
+	return wpa_ctrl_command(ctrl, cmd);
+}
+#endif /* CONFIG_WPS_NFC */
+
+
 static int wpa_cli_cmd_ibss_rsn(struct wpa_ctrl *ctrl, int argc, char *argv[])
 {
 	char cmd[256];
@@ -3152,6 +3178,11 @@ static struct wpa_cli_cmd wpa_cli_commands[] = {
 	{ "wps_er_config", wpa_cli_cmd_wps_er_config,
 	  cli_cmd_flag_sensitive,
 	  "<UUID> <PIN> <SSID> <auth> <encr> <key> = configure AP" },
+#ifdef CONFIG_WPS_NFC
+	{ "wps_er_nfc_config_token", wpa_cli_cmd_wps_er_nfc_config_token,
+	  cli_cmd_flag_none,
+	  "<WPS/NDEF> <UUID> = build NFC configuration token" },
+#endif /* CONFIG_WPS_NFC */
 	{ "ibss_rsn", wpa_cli_cmd_ibss_rsn,
 	  cli_cmd_flag_none,
 	  "<addr> = request RSN authentication with <addr> in IBSS" },

wpa_supplicant/wps_supplicant.c

@@ -1674,6 +1674,34 @@ int wpas_wps_er_config(struct wpa_supplicant *wpa_s, const char *uuid,
 }
 
 
+#ifdef CONFIG_WPS_NFC
+struct wpabuf * wpas_wps_er_nfc_config_token(struct wpa_supplicant *wpa_s,
+					     int ndef, const char *uuid)
+{
+	struct wpabuf *ret;
+	u8 u[UUID_LEN];
+
+	if (!wpa_s->wps_er)
+		return NULL;
+
+	if (uuid_str2bin(uuid, u))
+		return NULL;
+
+	ret = wps_er_nfc_config_token(wpa_s->wps_er, u);
+	if (ndef && ret) {
+		struct wpabuf *tmp;
+		tmp = ndef_build_wifi(ret);
+		wpabuf_free(ret);
+		if (tmp == NULL)
+			return NULL;
+		ret = tmp;
+	}
+
+	return ret;
+}
+#endif /* CONFIG_WPS_NFC */
+
+
 static int callbacks_pending = 0;
 
 static void wpas_wps_terminate_cb(void *ctx)

wpa_supplicant/wps_supplicant.h

@@ -59,6 +59,8 @@ int wpas_wps_er_set_config(struct wpa_supplicant *wpa_s, const char *uuid,
 			   int id);
 int wpas_wps_er_config(struct wpa_supplicant *wpa_s, const char *uuid,
 		       const char *pin, struct wps_new_ap_settings *settings);
+struct wpabuf * wpas_wps_er_nfc_config_token(struct wpa_supplicant *wpa_s,
+					     int ndef, const char *uuid);
 int wpas_wps_terminate_pending(struct wpa_supplicant *wpa_s);
 int wpas_wps_in_progress(struct wpa_supplicant *wpa_s);
 void wpas_wps_update_config(struct wpa_supplicant *wpa_s);