![]() ![]() Dart uses Google’s BoringSSL to handle everything SSL related, and luckily both Dart and BoringSSL are open source. To solve this we have to dig into libflutter.so and figure out what we need to patch or hook in order to validate our certificate. This means that we can’t bypass SSL validation by adding our proxy CA to the system CA store. This is weird since my device is set up to include my Burp certificate as a trusted root CA.Īfter some research, I ended up on a GitHub issue that explains the issue for Windows, but the same is applicable to Android: Dart generates and compiles its own Keystore using Mozilla’s NSS library. If I change the URL to HTTPS, Burp complains that the SSL handshake fails. ProxyDroid with root access using iptables Intercepting HTTPS traffic A quick modification on my test application indeed shows that this configuration sends all HTTP data to my proxy: It’s also possible to define a custom findProxy implementation that returns the preferred proxy. Even if the application would be compiled with this implementation, it would be pretty useless on Android since all applications are children of the initial zygote process which does not have these environment variables. The application can set this property to HttpClient.findProxyFromEnvironment which searches for specific environment variables such as http_proxy and https_proxy. If this function is not set, direct connections will always be used. Sets the function used to resolve the proxy server to be used for opening a HTTP connection to the specified url. The HttpClient has a findProxy method and its documentation is pretty clear on this: By default all traffic is sent directly to the target server, without taking any proxy settings into account: Sending traffic to the proxy through ProxyDroid/iptables ![]() Unfortunately, Burp does not see any traffic passing through, even though the app logs indicate that the request was successful. ![]() On my device I have Frida installed through Magisk-Frida-Server and my Burp certificate is added to the system CA store with the MagiskTrustUserCerts module. Every time we press the button, a call is sent to and if it’s successful it is printed to the device logs. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |