Cannot Use Charles Proxy after update the phones to Android 9

Question

I updated my test devices (Samsung galaxy Note 9 and galaxy S9+) to Android 9. Now I am not able to use Charles proxy to grep any traffic. I have updated my Charles Proxy to the latest version 4.2.8 (MAC) And I have configured proxy on Wifi setting like old days.

Note: Charles Proxy was working fine before update (Android 8.0 for S9+, 8.1 for Note 9)

Answer 1

SSL Certificates | Charles

As of Android N, you need to add configuration to your app in order to have it trust the SSL certificates generated by Charles SSL Proxying. This means that you can only use SSL Proxying with apps that you control.

Add a file res/xml/network_security_config.xml to your app:

<network-security-config> 
  <debug-overrides> 
    <trust-anchors> 
      <!-- Trust user added CAs while debuggable only -->
      <certificates src="user" /> 
    </trust-anchors> 
  </debug-overrides> 
</network-security-config>

Then add a reference to this file in your app's manifest, as follows:

<?xml version="1.0" encoding="utf-8"?>
<manifest ... >
    <application android:networkSecurityConfig="@xml/network_security_config" ... >
        ...
    </application>
</manifest>

After you have reinstalled charles proxy, recreate the certificate.

Answer 2

If you have root access to your phone you can do the same that was done here and add the charles proxy certificate to the system trusted certificates of the phone