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Code Issues Releases Wiki Activity

Revert "Implement SSL file-based session caching"

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This reverts commit 43c38a047f.
This commit is contained in:
Joe Steele 2014-09-30 18:17:20 -04:00 committed by cketti
parent f8ffead008
commit a141457886
2 changed files with 0 additions and 90 deletions
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89
src/com/fsck/k9/net/ssl/SslSessionCacheHelper.java
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@ -1,89 +0,0 @@
package com.fsck.k9.net.ssl;
import java.io.File;
import java.lang.reflect.Method;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSessionContext;
import com.fsck.k9.K9;
import android.content.Context;
import android.os.Build;
import android.util.Log;
/**
* A class to help with associating an {@code SSLContext} with a persistent
* file-based cache of SSL sessions.
* <p>
* This uses reflection to achieve its task.
* <p>
* The alternative to this would be to use {@link SSLCertificateSocketFactory}
* which also provides session caching. The problem with using that occurs when
* using STARTTLS in combination with
* {@code TrustedSocketFactory.hardenSocket(SSLSocket)}. The result is that
* {@code hardenSocket()} fails to change anything because by the time it is
* applied to the socket, the SSL handshake has already been completed. (This is
* because of another feature of {@link SSLCertificateSocketFactory} whereby it
* performs host name verification which necessitates initiating the SSL
* handshake immediately on socket creation.)
* <p>
* If eventually the use of hardenSocket() should become unnecessary, then
* switching to using {@link SSLCertificateSocketFactory} would be a better
* solution.
*/
public class SslSessionCacheHelper {
private static Object sSessionCache;
private static Method sSetPersistentCacheMethod;
private static boolean sIsDisabled = false;
static {
final String packageName;
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
packageName = "org.apache.harmony.xnet.provider.jsse";
} else {
packageName = "com.android.org.conscrypt";
}
final File cacheDirectory = K9.app.getDir("sslcache", Context.MODE_PRIVATE);
try {
Class<?> fileClientSessionCacheClass = Class.forName(packageName +
".FileClientSessionCache");
Method usingDirectoryMethod = fileClientSessionCacheClass
.getMethod("usingDirectory", File.class);
sSessionCache = usingDirectoryMethod.invoke(null, cacheDirectory);
Class<?> sslClientSessionCacheClass = Class.forName(packageName +
".SSLClientSessionCache");
Class<?> clientSessionContextClass = Class.forName(packageName +
".ClientSessionContext");
sSetPersistentCacheMethod = clientSessionContextClass.getMethod(
"setPersistentCache", sslClientSessionCacheClass);
} catch (Exception e) {
// Something went wrong. Proceed without a session cache.
Log.e(K9.LOG_TAG, "Failed to initialize SslSessionCacheHelper: " + e);
sIsDisabled = true;
}
}
/**
* Associate an {@code SSLContext} with a persistent file-based cache of SSL
* sessions which can be used when re-establishing a connection to the same
* server.
* <p>
* This is beneficial because it can eliminate redundant cryptographic
* computations and network traffic, thus saving time and conserving power.
*/
public static void setPersistentCache(SSLContext sslContext) {
if (sIsDisabled) {
return;
}
try {
SSLSessionContext sessionContext = sslContext.getClientSessionContext();
sSetPersistentCacheMethod.invoke(sessionContext, sSessionCache);
} catch (Exception e) {
// Something went wrong. Proceed without a session cache.
Log.e(K9.LOG_TAG, "Failed to initialize persistent SSL cache: " + e);
sIsDisabled = true;
}
}
}

1
src/com/fsck/k9/net/ssl/TrustedSocketFactory.java
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@ -144,7 +144,6 @@ public class TrustedSocketFactory {
SSLContext context = SSLContext.getInstance("TLS"); SSLContext context = SSLContext.getInstance("TLS");
context.init(keyManagers, trustManagers, null); context.init(keyManagers, trustManagers, null);
SslSessionCacheHelper.setPersistentCache(context);
SSLSocketFactory socketFactory = context.getSocketFactory(); SSLSocketFactory socketFactory = context.getSocketFactory();
Socket trustedSocket; Socket trustedSocket;
if (socket == null) { if (socket == null) {