WPS: Fix an interoperability issue with mixed mode and AP Settings

It looks like Windows 7 WPS implementation does not like multiple
Authentication/Encryption Type bits to be set in M7 AP Settings
attributes, i.e., it refused to add a network profile if the AP
was configured for WPA/WPA2 mixed mode and AP PIN was used to
enroll the network.

Leave only a single bit set in the Authentication/Encryption Type
attributes in M7 when the AP is acting as an Enrollee to avoid this
issue.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>

src/wps/wps_enrollee.c

@@ -257,20 +257,47 @@ static int wps_build_cred_ssid(struct wps_data *wps, struct wpabuf *msg)
 
 static int wps_build_cred_auth_type(struct wps_data *wps, struct wpabuf *msg)
 {
-	wpa_printf(MSG_DEBUG, "WPS:  * Authentication Type");
+	u16 auth_type = wps->wps->auth_types;
+
+	/* Select the best authentication type */
+	if (auth_type & WPS_AUTH_WPA2PSK)
+		auth_type = WPS_AUTH_WPA2PSK;
+	else if (auth_type & WPS_AUTH_WPAPSK)
+		auth_type = WPS_AUTH_WPAPSK;
+	else if (auth_type & WPS_AUTH_OPEN)
+		auth_type = WPS_AUTH_OPEN;
+	else if (auth_type & WPS_AUTH_SHARED)
+		auth_type = WPS_AUTH_SHARED;
+
+	wpa_printf(MSG_DEBUG, "WPS:  * Authentication Type (0x%x)", auth_type);
 	wpabuf_put_be16(msg, ATTR_AUTH_TYPE);
 	wpabuf_put_be16(msg, 2);
-	wpabuf_put_be16(msg, wps->wps->auth_types);
+	wpabuf_put_be16(msg, auth_type);
 	return 0;
 }
 
 
 static int wps_build_cred_encr_type(struct wps_data *wps, struct wpabuf *msg)
 {
-	wpa_printf(MSG_DEBUG, "WPS:  * Encryption Type");
+	u16 encr_type = wps->wps->encr_types;
+
+	/* Select the best encryption type */
+	if (wps->wps->auth_types & (WPS_AUTH_WPA2PSK | WPS_AUTH_WPAPSK)) {
+		if (encr_type & WPS_ENCR_AES)
+			encr_type = WPS_ENCR_AES;
+		else if (encr_type & WPS_ENCR_TKIP)
+			encr_type = WPS_ENCR_TKIP;
+	} else {
+		if (encr_type & WPS_ENCR_WEP)
+			encr_type = WPS_ENCR_WEP;
+		else if (encr_type & WPS_ENCR_NONE)
+			encr_type = WPS_ENCR_NONE;
+	}
+
+	wpa_printf(MSG_DEBUG, "WPS:  * Encryption Type (0x%x)", encr_type);
 	wpabuf_put_be16(msg, ATTR_ENCR_TYPE);
 	wpabuf_put_be16(msg, 2);
-	wpabuf_put_be16(msg, wps->wps->encr_types);
+	wpabuf_put_be16(msg, encr_type);
 	return 0;
 }