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126 lines
5.0 KiB
Markdown
126 lines
5.0 KiB
Markdown
# MemorizingTrustManager - Private Cloud Support for Your App
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MemorizingTrustManager (MTM) is a project to enable smarter and more secure use
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of SSL on Android. If it encounters an unknown SSL certificate, it asks the
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user whether to accept the certificate once, permanently or to abort the
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connection. This is a step in preventing man-in-the-middle attacks by blindly
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accepting any invalid, self-signed and/or expired certificates.
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MTM is aimed at providing seamless integration into your Android application,
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and the source code is available under the MIT license.
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## Screenshots
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## Status
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MemorizingTrustManager is in production use in the
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[yaxim XMPP client](https://yaxim.org/). It is usable and easy to integrate,
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though it does not yet support hostname validation (the Java API makes it
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**hard** to integrate).
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## Integration
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MTM is easy to integrate into your own application. Follow these steps or have
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a look into the demo application in the `example` directory.
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### 1. Add MTM to your project
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Download the MTM source from GitHub, or add it as a
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[git submodule](http://git-scm.com/docs/git-submodule):
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# plain download:
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git clone https://github.com/ge0rg/MemorizingTrustManager
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# submodule:
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git submodule add https://github.com/ge0rg/MemorizingTrustManager
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Then add a library project dependency to `default.properties`:
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android.library.reference.1=MemorizingTrustManager
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### 2. Add the MTM (popup) Activity to your manifest
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Edit your `AndroidManifest.xml` and add the MTM activity element right before the
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end of your closing `</application>` tag.
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...
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<activity android:name="de.duenndns.ssl.MemorizingActivity"
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android:theme="@android:style/Theme.Translucent.NoTitleBar"
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/>
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</application>
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</manifest>
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### 3. Hook MTM as the default TrustManager for your connection type
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Hooking MemorizingTrustmanager in HTTPS connections:
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// register MemorizingTrustManager for HTTPS
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SSLContext sc = SSLContext.getInstance("TLS");
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MemorizingTrustManager mtm = new MemorizingTrustManager(this);
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sc.init(null, new X509TrustManager[] { mtm }, new java.security.SecureRandom());
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HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
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HttpsURLConnection.setDefaultHostnameVerifier(
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mtm.wrapHostnameVerifier(HttpsURLConnection.getDefaultHostnameVerifier()));
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Or, for aSmack you can use `setCustomSSLContext()`:
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org.jivesoftware.smack.ConnectionConfiguration connectionConfiguration = …
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SSLContext sc = SSLContext.getInstance("TLS");
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MemorizingTrustManager mtm = new MemorizingTrustManager(this);
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sc.init(null, new X509TrustManager[] { mtm }, new java.security.SecureRandom());
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connectionConfiguration.setCustomSSLContext(sc);
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connectionConfiguration.setHostnameVerifier(
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mtm.wrapHostnameVerifier(new org.apache.http.conn.ssl.StrictHostnameVerifier()));
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By default, MTM falls back to the system `TrustManager` before asking the user.
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If you do not trust the establishment, you can enforce a dialog on *every new
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connection* by supplying a `defaultTrustManager = null` parameter to the
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constructor:
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MemorizingTrustManager mtm = new MemorizingTrustManager(this, null);
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If you want to use a different underlying `TrustManager`, like
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[AndroidPinning](https://github.com/moxie0/AndroidPinning), just supply that to
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MTM's constructor:
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X509TrustManager pinning = new PinningTrustManager(SystemKeyStore.getInstance(),
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new String[] {"f30012bbc18c231ac1a44b788e410ce754182513"}, 0);
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MemorizingTrustManager mtm = new MemorizingTrustManager(this, pinning);
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### 4. Profit!
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### Logging
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MTM uses java.util.logging (JUL) for logging purposes. If you have not
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configured a Handler for JUL, then Android will by default log all
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messages of Level.INFO or higher. In order to get also the debug log
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messages (those with Level.FINE or lower) you need to configure a
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Handler accordingly. The MTM example project contains
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de.duenndns.mtmexample.JULHandler, which allows to enable and disable
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debug logging at runtime.
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## Alternatives
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MemorizingTrustManager is not the only one out there.
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[**NetCipher**](https://guardianproject.info/code/netcipher/) is an Android
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library made by the [Guardian Project](https://guardianproject.info/) to
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improve network security for mobile apps. It comes with a StrongTrustManager
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to do more thorough certificate checks, an independent Root CA store, and code
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to easily route your traffic through
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[the Tor network](https://www.torproject.org/) using [Orbot](https://guardianproject.info/apps/orbot/).
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[**AndroidPinning**](https://github.com/moxie0/AndroidPinning) is another Android
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library, written by [Moxie Marlinspike](http://www.thoughtcrime.org/) to allow
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pinning of server certificates, improving security against government-scale
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MitM attacks. Use this if your app is made to communicate with a specific
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server!
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## Contribute
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Please [help translating MTM into more languages](https://translations.launchpad.net/yaxim/master/+pots/mtm/)!
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