Download Fiddler Root Certificate For Android

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  1. Download Fiddler Root Certificate For Android Emulator
  2. Download Fiddler Root Certificate For Android Download
  3. Download Fiddler Root Certificate For Android App

Fiddler and FiddlerCore offer three different choices for generating interception certificates:

To download the certificate file on the device, send it as an email attachment or host it on a secure website. Note Do not install the server certificate by accessing the protected resource directly from your browser. This action imports the certificate only into the browser space and not into the device system truststore. Oke kembali lagi ke FIddler, Karena Fiddler memproduksi Fake Certificate dan bukanlah sebuah Certificate yang diterbitkan oleh Trusted Root Certificate Authority, Browser anda tidak akan mengenali Certificate yang dikirim oleh Attacker (Dengan asumsi bahwa Attacker adalah pengguna Fiddler). Download Fiddler. Accept the prompts to Trust and Install the Fiddler Root Certificate. Configure Fiddler to capture Mobil Android HTTPS traffic. Every Fiddler root certificate is uniquely generated, per user, per machine. No two Fiddler installations have the same root certificate. The only way for a Fiddler user to be “spoofed” by a bad guy is if that bad guy already is running code inside the user’s account (which means you’d already be pwned anyway).

On the Fiddler Echo Service Webpage, click the FiddlerRoot Certificate link. If the download doesn't open automatically, swipe down from the top and tap the Settings icon. Tap Personal Security. Under Credential Storage, tap Install from storage. Download the Fiddler root certificate. This is all you need to know about capturing web traffic from Android devices with Fiddler. If you have any questions.

  • MakeCert
  • CertEnroll
  • Bouncy Castle

If you’re so inclined, you can even write your own certificate generator (say, by wrapping OpenSSL) and expose it to Fiddler using the ICertificateProvider3 interface.

On Windows, Fiddler includes the MakeCert and CertEnroll certificate generators by default; you can download the Bouncy Castle Certificate Generator if you like. In contrast, when Fiddler is running on Linux and Mac, only the Bouncy Castle certificate generator is available, and it is included by default.

If you’re using Windows, however, you may wonder which Certificate Generator you should use in Fiddler or for your applications based on FiddlerCore.

In general, I recommend the Bouncy Castle generator, as it has better performance than the default MakeCert generator and it offers more configuration choices than the CertEnroll generator. Another advantage of the Bouncy Castle certificate generator is that the only certificate that (typically) goes in the Windows Certificate store is the root certificate. The server (end-entity) certificates generated for each website are kept in memory and discarded when Fiddler exits; because the Bouncy Castle generator reuses a single private key for all certificates by default, the performance impact of this behavior is minimal.

The only downside to the Bouncy Castle generator is its size: it is ~200KB when compressed, which is 25% larger than FiddlerCore itself.

The CertEnroll generator was added to Fiddler relatively recently; it offers better performance and standards-compliance than the legacy MakeCert generator but it is available only on Windows 7 and later. You can easily switch Fiddler to use CertEnroll inside Tools > Fiddler Options > HTTPS.

The MakeCert generator is the original certificate generator used by Fiddler and it remains the default on Windows today (mostly) for legacy compatibility reasons. It suffers from a number of shortcomings, including the fact that the certificates it generates are not compatible with iOS and (some) Android devices. It generates certificates with a 1024 bit RSA key (which may soon trigger warnings in some browsers) and each certificate has a unique key (meaning that each new secure site you visit triggers the somewhat costly key generation code).

Both the CertEnroll and MakeCert-based certificate generators must store all server certificates in the Windows Certificate store which some users may find confusing:

The storage of (potentially thousands of) server certificates in the user profile can also cause some problems for corporate users who have roaming user profiles, as these certificates are roamed to each workstation as the user logs in. To mitigate that, the Clear server certs on exit checkbox can be set inside the Tools > Fiddler Options > HTTPS > Certificate Provider dialog, or via:

FiddlerApplication.Prefs.SetBoolPref('fiddler.certmaker.CleanupServerCertsOnExit', true);

… however, the downside of doing that is that Fiddler must then re-create the server certificates every time it starts. This performance penalty is smaller when using CertEnroll, which reuses a single 2048-bit RSA key, than for MakeCert, which generates unique 1024-bit RSA keys for each site.

FiddlerCore Considerations

To determine which Certificate Generator is in use, be sure to attach the following event handlers:

Fiddler.FiddlerApplication.OnNotification +=
delegate(object sender, NotificationEventArgs oNEA) { Console.WriteLine(“** NotifyUser: ” + oNEA.NotifyString); };
Fiddler.FiddlerApplication.Log.OnLogString +=
delegate(object sender, LogEventArgs oLEA) { Console.WriteLine(“** LogString: ” + oLEA.LogString); };

You can then view information about the Certificate Generator in the console when it loads.

Developers building applications atop FiddlerCore should keep the following in mind when deciding which Certificate Generator to use:

MakeCert

  • MakeCert.exe is a Microsoft Visual Studio 2008 redistributable file, meaning that you’re licensed to redistribute it if you have an appropriate license to that version of Visual Studio. Microsoft may offer MakeCert.exe as a redistributable in other circumstances, but licensing is provided by Microsoft, not Telerik.
  • To use MakeCert.exe, you must include it adjacent to your application’s .exe file.
  • MakeCert-generated certificates are not compatible with iOS and some Android devices.
  • MakeCert-generated certificates “pollute” the user’s Certificate Store and you should consider offering a mechanism to clear them.

CertEnroll

  • The CertEnroll API is available on Windows 7 and later.
  • Use CertEnroll by either omitting makecert.exe from the application’s folder or by explicitly setting the preference:

    • FiddlerApplication.Prefs.SetBoolPref('fiddler.certmaker.PreferCertEnroll', true);

  • CertEnroll-generated certificates “pollute” the user’s Certificate Store and you should consider offering a mechanism to clear them.

Bouncy Castle

  • Bouncy Castle is an open-source PKI and crypto library distributed under the MIT license.

  • To use Bouncy Castle, you must include CertMaker.dll and BCMakeCert.dll adjacent to your application’s .exe file.
  • Bouncy Castle does not store certificates in the Windows Certificate Store (yay!) but this also means that your application needs to keep track of its root certificate and private key (unless you recreate and retrust it every time the application runs).

    Two preferences are used to hold the key and certificate, fiddler.certmaker.bc.key and fiddler.certmaker.bc.cert. After you first call createRootCert, you should retrieve these preferences using FiddlerApplication.Prefs.GetStringPref and store them somewhere within your application’s settings (registry, XML, etc); the private key should be considered sensitive data and protected as such. When your application next runs, it should detect whether the key and certificate have already been created, and if so, they should be provided to the certificate generator using FiddlerApplication.Prefs.SetStringPref before any certificates are requested, lest you inadvertently create a new root certificate.

    Rick Strahl wrote a great blog post on this process, including some sample code.

-Eric

Almost every time I’m working on network stuff in iOS or Android, I immediately open up Fiddler. I know that there’s also Charles Proxy for OS X which does just as well as Fiddler, but the majority of the time, my Windows VM is running anyway, so I just haven’t been able to justify the $50 for Charles Proxy when Fiddler is free.

When I’m working on networking stuff in iOS or Android, I don’t like treating networks as a black box. I do my web request and even if everything is giving me 200’s and looks like it’s working, it’s still a good idea to check the connection to be absolutely positive that you’re sending and receiving what you expect. If all goes well, you spend a few extra minutes looking at network transactions and pat yourself on the back for a job well done. But if things aren’t going perfectly, it makes things a whole lot easier to debug.

So here’s the steps I use to get things set up to be able to look at http/https traffic from my mobile devices. You can also easily extrapolate the steps to allow any device to go through your Fiddler install.

Install Fiddler

Even if you have Fiddler installed, you should still read this section because there’s more too it than you may expect.

Head over to Fiddler’s download page to get the latest version. Download the .Net 4 version. I have never had to download the .Net 2 version of Fiddler, and unless you are working in the stone age, you shouldn’t need it either. -Note: I’m sorry if I offended you if you are living in the stone age. But seriously, Windows XP is dead. What kind of person is trying to debug iOS/Android web traffic and is still running Windows XP?

Once you download and install Fiddler, there’s 1 more step. Fiddler’s default certificate maker doesn’t work out too well with iOS or Android devices. If you don’t care about decrypting https traffic, then there’s really no need to worry, but you might as well set things up completely to begin with. If you never have to decrypt https traffic then lucky you, but now days as a developer you’ll probably have to do it at least some time.

Fiddler has a wide array of Add-ons. Some of them are pretty nice, so I recommend taking a moment to glance at the page, but the only one that you need is CertMaker for iOS and Android. Here’s the direct download, but you should probably still head over to their site to make sure you get the latest version. Simply download it and run the executable to install the CertMaker.

Setup Fiddler

Now that we’ve got Fiddler and the CertMaker installed, we need to do a little bit of setup.

Open up Tools->Fiddler Options…

On the HTTPS tab, make sure the box for “Capture HTTPS CONNECTs” and “Decrypt HTTPS traffic” are both checked. The first time you do this, Fiddler will prompt you to make sure you want to trust the Fiddler Root certificate. Then Windows will prompt you, then Fiddler will prompt you again, then the certificate will finally be installed. You will need to say Yes on every one of those prompts. If you say No, then Fiddler won’t be able to decrypt your https traffic.

Download Fiddler Root Certificate For Android Emulator

The reason for so many prompts is because allowing https traffic to be decrypted is a slight security hole. I’ve never had any issues with it in the years that I’ve been decrypting my own https traffic. If you are a particularly paranoid individual, you can uncheck “Decrypt HTTPS traffic” and then click the button labeled “Remove Interception Certificates” and that will remove the Fiddler Root certificate. Doing this, you could install the certificate only while you need it installed, and then remove it when you’re done decrypting your traffic. I don’t personally do this, but you are welcome to.

NOTE: on newer versions of Fiddler, there is an “Actions” button on the right side of this dialog, if you click on it has options to get Fiddler to install/uninstall the Fiddler root certificate. If you’re not interested in snooping your own traffic, you don’t really have to install the certificate, but its easier to just install it so you never have to go back and set it up later.

Next, go to the Connections tab. And check the box that says “Allow remote computers to connect”

Now you’ll need to restart Fiddler.

iOS Setup

On your iOS device, open up Safari (you must use Safari) and navigate to

This will bump you into settings with a window to install the Fiddler certificate.

Download Fiddler Root Certificate For Android Download

Ignore that the name of the certificate is “DO_NOT_TRUST_FiddlerRoot” you really can trust it. Press install, then install again, then type in your pin for your device.

Now you need to go to your wifi settings and go to the properties for your network

Download Fiddler Root Certificate For Android App

And finally, set the proxy settings for the network

Now all of the https traffic on your iOS device will proxy though Fiddler.

Android Setup

Unfortunately for Android, the setup can vary from device to device. And on some devices, the OEM has made modifications to the OS to disallow user defined root certificates. The Sony Xperia is one we had particular trouble with at work. The basic steps (regardless of the platform) are:

  • Install the Fiddler Root certificate onto your device to allow Fiddler to decrypt https traffic
  • Set the proxy settings for your network

Some Android devices require you to jump through hoops to install the Fiddler Certificate, and all Android devices I’ve found require you to set a PIN or Pattern or what not in order to install the Fiddler Certificate.

Open up a browser, on Android it shouldn’t have to be a specific one, and navigate to:

If you’re lucky, you won’t have to jump through any hoops to install the certificate. You’ll be presented with a prompt to name/install the certificate

Name the certificate something useful, make sure its set to VPN and apps for the credential usage and then tap OK. Once you tap OK, you may get some additional prompts from Android about a PIN or something, every Android device is different.

If visiting the URL to get the certificate downloads the certificate, but doesn’t start trying to install the certificate, don’t worry. It downloaded the certificate, it just didn’t try to install it.

  1. Open Settings
  2. Go to Security
  3. Scroll way down and tap on ‘Install from SD card’ or ‘Install from External Storage’ or whatever it says

This should open the same prompt as above. If it doesn’t you will need to consult with Google (good luck).

Once you’ve got the certificate installed

  1. Go to your wireless settings
  2. Long press on your network
  3. Select ‘Modify network’ from the modal dialog that opens
  4. Check ‘Show Advanced options’
  5. Fill out the proxy settings

In the image below, Save is disabled because I did not enter a proper hostname

Now all of the https traffic on your Android device will proxy though Fiddler.

Happy Debugging!