WPS NFC: Allow configuration token to be built from network block

"WPS_NFC_CONFIG_TOKEN <WPS/NDEF> <network id>" can now be used to build
an NFC configuration token from a locally configured network.

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

src/wps/wps.h

@@ -802,6 +802,8 @@ int wps_er_set_config(struct wps_er *er, const u8 *uuid, const u8 *addr,
 int wps_er_config(struct wps_er *er, const u8 *uuid, const u8 *addr,
 		  const u8 *pin, size_t pin_len,
 		  const struct wps_credential *cred);
+struct wpabuf * wps_er_config_token_from_cred(struct wps_context *wps,
+					      struct wps_credential *cred);
 struct wpabuf * wps_er_nfc_config_token(struct wps_er *er, const u8 *uuid,
 					const u8 *addr);
 

src/wps/wps_er.c

@@ -2023,12 +2023,35 @@ int wps_er_config(struct wps_er *er, const u8 *uuid, const u8 *addr,
 
 
 #ifdef CONFIG_WPS_NFC
+
+struct wpabuf * wps_er_config_token_from_cred(struct wps_context *wps,
+					      struct wps_credential *cred)
+{
+	struct wpabuf *ret;
+	struct wps_data data;
+
+	ret = wpabuf_alloc(500);
+	if (ret == NULL)
+		return NULL;
+
+	os_memset(&data, 0, sizeof(data));
+	data.wps = wps;
+	data.use_cred = cred;
+	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;
+}
+
+
 struct wpabuf * wps_er_nfc_config_token(struct wps_er *er, const u8 *uuid,
 					const u8 *addr)
 {
 	struct wps_er_ap *ap;
-	struct wpabuf *ret;
-	struct wps_data data;
 
 	if (er == NULL)
 		return NULL;
@@ -2042,20 +2065,7 @@ struct wpabuf * wps_er_nfc_config_token(struct wps_er *er, const u8 *uuid,
 		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 wps_er_config_token_from_cred(er->wps, ap->ap_settings);
 }
 
-	return ret;
-}
 #endif /* CONFIG_WPS_NFC */

wpa_supplicant/README-WPS

@@ -346,6 +346,10 @@ tag with an external program. Once written, the NFC configuration token
 can be used to touch an NFC interface on a station to provision the
 credentials needed to access the network.
 
+The "wps_nfc_config_token <WPS/NDEF> <network id>" command can be used
+to build an NFC configuration token based on a locally configured
+network.
+
 If the station includes NFC interface and reads an NFC tag with a MIME
 media type "application/vnd.wfa.wsc", the NDEF message payload (with or
 without NDEF encapsulation) can be delivered to wpa_supplicant using the

wpa_supplicant/ctrl_iface.c

@@ -784,7 +784,11 @@ static int wpa_supplicant_ctrl_iface_wps_nfc_config_token(
 	int ndef;
 	struct wpabuf *buf;
 	int res;
+	char *pos;
 
+	pos = os_strchr(cmd, ' ');
+	if (pos)
+		*pos++ = '\0';
 	if (os_strcmp(cmd, "WPS") == 0)
 		ndef = 0;
 	else if (os_strcmp(cmd, "NDEF") == 0)
@@ -792,7 +796,7 @@ static int wpa_supplicant_ctrl_iface_wps_nfc_config_token(
 	else
 		return -1;
 
-	buf = wpas_wps_nfc_config_token(wpa_s, ndef);
+	buf = wpas_wps_nfc_config_token(wpa_s, ndef, pos);
 	if (buf == NULL)
 		return -1;
 

wpa_supplicant/examples/wps-nfc.py

@@ -53,10 +53,12 @@ def wpas_tag_read(message):
     print wpas.request("WPS_NFC_TAG_READ " + message.encode("hex"))
 
 
-def wpas_get_config_token():
+def wpas_get_config_token(id=None):
     wpas = wpas_connect()
     if (wpas == None):
         return None
+    if id:
+        return wpas.request("WPS_NFC_CONFIG_TOKEN NDEF " + id).rstrip().decode("hex")
     return wpas.request("WPS_NFC_CONFIG_TOKEN NDEF").rstrip().decode("hex")
 
 
@@ -258,9 +260,9 @@ def wps_tag_read(tag):
         time.sleep(0.1)
 
 
-def wps_write_config_tag(clf):
+def wps_write_config_tag(clf, id=None):
     print "Write WPS config token"
-    data = wpas_get_config_token()
+    data = wpas_get_config_token(id)
     if (data == None):
         print "Could not get WPS config token from wpa_supplicant"
         return
@@ -364,6 +366,10 @@ def main():
             wps_write_config_tag(clf)
             raise SystemExit
 
+        if len(sys.argv) > 2 and sys.argv[1] == "write-config-id":
+            wps_write_config_tag(clf, sys.argv[2])
+            raise SystemExit
+
         if len(sys.argv) > 2 and sys.argv[1] == "write-er-config":
             wps_write_er_config_tag(clf, sys.argv[2])
             raise SystemExit

wpa_supplicant/wps_supplicant.c

@@ -1656,6 +1656,40 @@ int wpas_wps_er_learn(struct wpa_supplicant *wpa_s, const char *uuid,
 }
 
 
+static int wpas_wps_network_to_cred(struct wpa_ssid *ssid,
+				    struct wps_credential *cred)
+{
+	os_memset(cred, 0, sizeof(*cred));
+	if (ssid->ssid_len > 32)
+		return -1;
+	os_memcpy(cred->ssid, ssid->ssid, ssid->ssid_len);
+	cred->ssid_len = ssid->ssid_len;
+	if (ssid->key_mgmt & WPA_KEY_MGMT_PSK) {
+		cred->auth_type = (ssid->proto & WPA_PROTO_RSN) ?
+			WPS_AUTH_WPA2PSK : WPS_AUTH_WPAPSK;
+		if (ssid->pairwise_cipher & WPA_CIPHER_CCMP)
+			cred->encr_type = WPS_ENCR_AES;
+		else
+			cred->encr_type = WPS_ENCR_TKIP;
+		if (ssid->passphrase) {
+			cred->key_len = os_strlen(ssid->passphrase);
+			if (cred->key_len >= 64)
+				return -1;
+			os_memcpy(cred->key, ssid->passphrase, cred->key_len);
+		} else if (ssid->psk_set) {
+			cred->key_len = 32;
+			os_memcpy(cred->key, ssid->psk, 32);
+		} else
+			return -1;
+	} else {
+		cred->auth_type = WPS_AUTH_OPEN;
+		cred->encr_type = WPS_ENCR_NONE;
+	}
+
+	return 0;
+}
+
+
 int wpas_wps_er_set_config(struct wpa_supplicant *wpa_s, const char *uuid,
 			   int id)
 {
@@ -1674,32 +1708,8 @@ int wpas_wps_er_set_config(struct wpa_supplicant *wpa_s, const char *uuid,
 	if (ssid == NULL || ssid->ssid == NULL)
 		return -1;
 
-	os_memset(&cred, 0, sizeof(cred));
-	if (ssid->ssid_len > 32)
+	if (wpas_wps_network_to_cred(ssid, &cred) < 0)
 		return -1;
-	os_memcpy(cred.ssid, ssid->ssid, ssid->ssid_len);
-	cred.ssid_len = ssid->ssid_len;
-	if (ssid->key_mgmt & WPA_KEY_MGMT_PSK) {
-		cred.auth_type = (ssid->proto & WPA_PROTO_RSN) ?
-			WPS_AUTH_WPA2PSK : WPS_AUTH_WPAPSK;
-		if (ssid->pairwise_cipher & WPA_CIPHER_CCMP)
-			cred.encr_type = WPS_ENCR_AES;
-		else
-			cred.encr_type = WPS_ENCR_TKIP;
-		if (ssid->passphrase) {
-			cred.key_len = os_strlen(ssid->passphrase);
-			if (cred.key_len >= 64)
-				return -1;
-			os_memcpy(cred.key, ssid->passphrase, cred.key_len);
-		} else if (ssid->psk_set) {
-			cred.key_len = 32;
-			os_memcpy(cred.key, ssid->psk, 32);
-		} else
-			return -1;
-	} else {
-		cred.auth_type = WPS_AUTH_OPEN;
-		cred.encr_type = WPS_ENCR_NONE;
-	}
 	return wps_er_set_config(wpa_s->wps_er, use_uuid, use_addr, &cred);
 }
 
@@ -1886,9 +1896,52 @@ void wpas_wps_update_config(struct wpa_supplicant *wpa_s)
 
 #ifdef CONFIG_WPS_NFC
 
-struct wpabuf * wpas_wps_nfc_config_token(struct wpa_supplicant *wpa_s,
-					  int ndef)
+#ifdef CONFIG_WPS_ER
+static struct wpabuf *
+wpas_wps_network_config_token(struct wpa_supplicant *wpa_s, int ndef,
+			      struct wpa_ssid *ssid)
 {
+	struct wpabuf *ret;
+	struct wps_credential cred;
+
+	if (wpas_wps_network_to_cred(ssid, &cred) < 0)
+		return NULL;
+
+	ret = wps_er_config_token_from_cred(wpa_s->wps, &cred);
+
+	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_ER */
+
+
+struct wpabuf * wpas_wps_nfc_config_token(struct wpa_supplicant *wpa_s,
+					  int ndef, const char *id_str)
+{
+#ifdef CONFIG_WPS_ER
+	if (id_str) {
+		int id;
+		char *end = NULL;
+		struct wpa_ssid *ssid;
+
+		id = strtol(id_str, &end, 10);
+		if (end && *end)
+			return NULL;
+
+		ssid = wpa_config_get_network(wpa_s->conf, id);
+		if (ssid == NULL)
+			return NULL;
+		return wpas_wps_network_config_token(wpa_s, ndef, ssid);
+	}
+#endif /* CONFIG_WPS_ER */
 #ifdef CONFIG_AP
 	if (wpa_s->ap_iface)
 		return wpas_ap_wps_nfc_config_token(wpa_s, ndef);

wpa_supplicant/wps_supplicant.h

@@ -63,7 +63,7 @@ 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);
 struct wpabuf * wpas_wps_nfc_config_token(struct wpa_supplicant *wpa_s,
-					  int ndef);
+					  int ndef, const char *id_str);
 struct wpabuf * wpas_wps_nfc_token(struct wpa_supplicant *wpa_s, int ndef);
 int wpas_wps_start_nfc(struct wpa_supplicant *wpa_s, const u8 *bssid);
 int wpas_wps_nfc_tag_read(struct wpa_supplicant *wpa_s,