android - 如何修复未 protected SMS BroadcastReceiver lint 警告

Question

我的应用需要能够接收短信。一切正常，但我收到此 lint 警告:

BroadcastReceivers that declare an intent-filter for SMS_DELIVER or SMS_RECEIVED must ensure that the caller has the BROADCAST_SMS permission, otherwise it is possible for malicious actors to spoof intents.

如何“确保调用方具有 BROADCAST_SMS 权限”？

在我的 list 中我有:

<uses-permission android:name="android.permission.RECEIVE_SMS" />
<application ...>
    <receiver
        android:name=".SmsReceiver"
        android:enabled="true"
        android:exported="true">
        <intent-filter android:priority="1000">
            <action android:name="android.provider.Telephony.SMS_RECEIVED" />
        </intent-filter>
    </receiver>
</application>

我的代码:

public class SmsReceiver extends BroadcastReceiver {
    public SmsReceiver() {}

    @Override
    public void onReceive(final Context context, final Intent intent) {

        final Bundle bundle = intent.getExtras();
        if (bundle != null) {
            final Object[] pdusObj = (Object[]) bundle.get("pdus");
            for (int i = 0; i < pdusObj.length; i++) {
                final SmsMessage currentMessage = SmsMessage.createFromPdu((byte[]) pdusObj[i]);
                // use currentMessage
            }
        }
    }
}

Answer 1

添加android:permission="android.permission.BROADCAST_SMS"到开幕<receiver>标签。例如:

<receiver
    android:name=".SmsReceiver"
    android:exported="true"
    android:permission="android.permission.BROADCAST_SMS">

这android:permission <receiver> 上的属性指定广播的发送者 必须持有哪个权限才能广播到您的 <receiver> .这是一种安全措施；在这种情况下，您可以相对确定是系统发送了 SMS_RECEIVED播送。它不是严格要求的，但很明显，如果它不存在，lint 会提示。