įrida Can let you do something, For example, record every time an application calls a specific method, Changing constants in built applications, Record how the values in the application change, Or replace the method to completely disable the feature. Imagine Greasemonkey, It's just for programs, not web pages. Get into Fridaįrida Is a cross platform multi-purpose framework, Used to dynamically change the way an application works from outside the application. In practice, That means if you want to know Twitter How applications use Twitter API, You need to make it trust you HTTPS Interception certificate. banking applications, Such as N26 or BBVA), They all know how to use their API The details are very protective, And hope the snooper can't look too carefully. In other words, It is still used in some corners of Android, Especially by very high-profile applications ( Such as Twitter) And very security sensitive applications ( E.g. There was a short time HTTP Standards to support this approach ( HTTP Public key pinning ), But it has been abandoned, And the browser has cancelled its support, Because it's too easy to accidentally and irreparably (!) Destroy application, Without any security benefits. įor similar reasons, It is not popular on the Internet. Google recommends avoiding the use of certificate fixation, Because it may make the application unusable. Now?, This practice has been more strictly controlled, Certificate pinning is less common, because ( As we will see ) It's actually Safety drama, And Google's own documents are now Special recommendations against This kind of practice. Ĭertificate locking used to be a more popular technology, Long before Android nougat, Android's own certificate verification is relatively loose, Users can easily be tricked into installing new trusted certificates on their devices. This is often referred to as " Public key pinning "、" Certificate pinning " or "SSL Pinning ".īecause this blocks all certification authorities except the specific certification authority list, It also prevented HTTPS The private certification authority used by the debugging agent, So we have a problem. This ensures that they will never trust new certificates from certification authorities they do not explicitly recognize, Therefore, it will not be accidental HTTPS Traffic is exposed to anyone other than the real server. These applications include their own custom certificate validation, To specify exactly what they are prepared to trust HTTPS Certificate issuer, Instead of trusting all trusted certificate issuers of the device. However, Unfortunately, Last 1% Applications that do not adhere to the default configuration are more complex. however, You can be root Change it on the device and most simulators, So it's possible to do this by using debugging agents in these environments HTTPS Intercept, Check the of these applications HTTPS Traffic. You cannot change the system certification authority on a normal device, So this list is quite reliable and safe. ĩ9% All applications adhere to this default value. What is certificate locking ?īy default, When an Android Application HTTPS When the connection, It will ensure that it is talking to a trusted server by comparing the issuer of the server certificate with the list of trusted system certificate authorities built in Android. Let's talk about how to use Frida remove SSL Lock to fight back, And expose the real traffic that any application is sending. Protection measures like certificate pinning make it difficult. Last, This is your Android device, Whether you're a security researcher who checks for vulnerabilities, An attempt to understand how an application uses its API Developers of, And a privacy advocate who records what data applications share, You should be able to see the information transmitted and received by the application you use on your own mobile phone. these HTTP Interception and simulation techniques are very useful for testing and understanding most applications, But they have problems with a small number of highly vigilant applications, These applications add additional protection, Designed to lock its HTTPS Flow and prevent this check. It depends on whether the target application trusts the debugging agent HTTPS Traffic certificate. This is not a purely theoretical problem - Protective measures like this try to stop HTTPS Check tools, Such as HTTP tool kit, It allows you to automatically intercept messages from Android The equipment HTTPS Inspection 、 Testing and mocking, Just like this. This is important for safety research 、 Privacy analysis and debugging, And control of your own equipment is problematic. Some Android apps spare no effort to ensure that even the owner of the device can't see the application HTTPS Request content. Original address : httptoolkit.tech/blog/frida-…
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