Motivation:
Java8 added support for using SNIHostName with SSLParameters. We currently ignore it in OpenSslEngine.
Modifications:
Use reflection to support SNIHostName.
Result:
People using Java8 can use SNIHostName even when OpenSslEngine is used.
Motivation:
When the OpenSslContext is gc'ed and the user still hold a reference to OpenSslSessionContext / OpenSslSessionStats it is possible to produce a segfault when calling
a method on any of these that tries to pass down the ctx pointer to the native methods. This is because the OpenSslContext finalizer will free the native pointer.
Modifications:
Change OpenSslSessionContext / OpenSslSessionContext to store a reference to OpenSslContext and so prevent the GC to collect it as long as the user has a reference to OpenSslSessionContext / OpenSslSessionContext.
Result:
No more sefault possible.
Motivation
This bug was introduced with #5377 and affects only users who'd like to share/cache/re-use `PemPrivateKey` and `PemX509Certificate` instances.
Modifications
Use `ByteBuf#writeBytes(src, readerIndex, length)` so that the src's readerIndex doesn't change and can consequently be used more than once.
Result
It's possible to share/cache/re-use `PemPrivateKey` and `PemX509Certificate` instances as long as their refCnt remains >= 1.
Motivation
OpenSslContext is expecting Java's PrivateKey and X509Certificate objects as input
(for JdkSslContext API compatibility reasons) but doesn't really use them beyond
turning them into PEM/PKCS#8 strings.
This conversion can be entirely skipped if the user can pass in private keys and
certificates in a format that Netty's OpenSSL code can digest.
Modifications
Two new classes have been added that act as a wrapper around the pre-encoded byte[]
and also retain API compatibility to JdkSslContext.
Result
It's possible to pass PEM encoded bytes straight into OpenSSL without having to
parse them (e.g. File to Java's PrivateKey) and then encode them (i.e. PrivateKey
into PEM/PKCS#8).
File pemPrivateKeyFile;
byte[] pemBytes = readBytes(pemPrivateKeyFile);
PemPrivateKey pemPrivateKey = PemPrivateKey.valueOf(pemBytes);
SslContextBuilder.forServer(pemPrivateKey)
.sslProvider(SslProvider.OPENSSL)
Motivation:
JCTools supports both non-unsafe, unsafe versions of queues and JDK6 which allows us to shade the library in netty-common allowing it to stay "zero dependency".
Modifications:
- Remove copy paste JCTools code and shade the library (dependencies that are shaded should be removed from the <dependencies> section of the generated POM).
- Remove usage of OneTimeTask and remove it all together.
Result:
Less code to maintain and easier to update JCTools and less GC pressure as the queue implementation nt creates so much garbage
Motivation:
OpenSslClientContext / OpenSslServerContext can never be garbage collected as both are part of a reference to a callback that is stored as global reference in jni code.
Modifications:
Ensure the callbacks are static and so not hold the reference.
Result:
No more leak due not collectable OpenSslClientContext / OpenSslServerContext
Motivation:
OpenSslEngine.wrap will only encrypt at most 1 buffer per call. We may be able to encrypt multiple buffers per call.
Modifications:
- OpensslEngine.wrap should continue encrypting data until there is an error, no more data, or until the destination buffer would be overflowed.
Result:
More encryption is done per OpenSslEngine.wrap call
Motivation:
CVE-2016-4970
OpenSslEngine.wrap calls SSL_write which may return SSL_ERROR_WANT_READ, and if in this condition there is nothing to read from the BIO the OpenSslEngine and SslHandler will enter an infinite loop.
Modifications:
- Use the error code provided by OpenSSL and go back to the EventLoop selector to detect if the socket is closed
Result:
OpenSslEngine correctly handles the return codes from OpenSSL and does not enter an infinite loop.
Motivation:
OpenSslEngine calls rejectRemoteInitiatedRenegation in a scenario where the number of handshakes has not been observed to change. The number of handshakes has only been observed to change after readPlaintextData is called.
Modifications:
- Remove the call to rejectRemoteInitiatedRenegation before calls to readPlaintextData
Result:
Less code.
Motivation:
When netty is used with open ssl provider and client authentication the following errors can occur:
error:140D9115:SSL routines:ssl_get_prev_session:session id context uninitialized
error:140A1175:SSL routines:ssl_bytes_to_cipher_list:inappropriate fallback
error:140760FC:SSL routines:SSL23_GET_CLIENT_HELLO:unknown protocol
Modifications:
Set the session id context in OpenSslServerContext so that sessions which use client authentication
which are cached have the same context id value.
Result:
Client authentication now works with open ssl provider.
Motivation:
Sometimes it is useful to include more details in the IdleStateEvents that are produced by the IdleStateHandler. For this users should be able to create their own IdleStateEvents that encapsulate more informations.
Modifications:
- Make IdleStateEvent constructor protected and the class non-final
- Add protected method to IdleStateHandler that users can override and so create their own IdleStateEvents.
Result:
More flexible and customizable IdleStateEvents / IdleStateHandler
Motivation:
We should zero-out the private key as soon as possible when we not need it anymore.
Modifications:
zero out the private key before release the buffer.
Result:
Limit the time the private key resist in memory.
Motivation:
FlowControlHandlerTest attempts to validate the expected contents of the underlying queue in FlowControlHandler. However the condition which triggers the check is too early and the queue contents may not yet contain all expected objects. For example a CountDownLatch is counted down in a handler's channelRead which is after the FlowControlHandler in the pipeline. At this point if there is a thread context switch the queue may not yet contain all the expected objects and checking the queue contents is not valid.
Modifications:
- Remove checking the queues contents in FLowControlHandlerTest and instead only check the empty condition at the end of the tests
Result:
FlowControlHandlerTest won't fail due to invalid checks of the contents of the queue.
Motivation:
The current note reads as if this class is dangerous and advises the reader to "understand what this class does".
Modifications:
Rewrite the Javadoc note to describe what fingerprint checks are and what problems remain.
Result:
Clearer description which no longer causes the impression this class is dangerous.
Motivation:
Some handlers such as HttpObjectDecoder can emit more than one event per read()
which leads to problems in downstream handlers that expect only one event and hope
that ChannelConfig#setAutoRead(false) prevents further events being sent while they're
processing the one they've just received.
Modifications:
A new handler called FlowControlHandler that feeds off read() and isAutoRead() and acts
as a holding buffer if auto reading gets turned off and more events arrive while auto reading
is off.
Result:
Fixes issues such as #4895.
Motivation:
Some applications may use alternative methods of loading the tcnative JNI symbols. We should support this use case.
Modifications:
Separate the loading and initialzation of the tcnative library so that each can fail independently.
Result:
Fixes#5043
Motivation:
Sometimes a user only has access to a preconfigured SSLContext but still would like to use our ssl sub-system. For this situations it would be very useful if the user could create a JdkSslContext instance from an existing SSLContext.
Modifications:
- Create new public constructors in JdkSslContext which allow to wrap an existing SSLContext and make the class non-abstract
- Mark JdkSslServerContext and JdkSslClientContext as deprecated as the user should not directly use these.
Result:
It's now possible to create an JdkSslContext from an existing SSLContext.
Motivation:
ApplicationProtocolNegotiationHandler attempts to get a reference to an SslHandler in handlerAdded, but when SNI is in use the actual SslHandler will be added to the pipeline dynamically at some later time. When the handshake completes ApplicationProtocolNegotiationHandler throws an IllegalStateException because its reference to SslHandler is null.
Modifications:
- Instead of saving a reference to SslHandler in handlerAdded just search the pipeline when the SslHandler is needed
Result:
ApplicationProtocolNegotiationHandler support SniHandler.
Fixes https://github.com/netty/netty/issues/5066
Motivation:
There are some use cases when a client may only be willing to read from a channel once
its previous write is finished (eg: serial dispatchers in Finagle). In this case, a
connection with SslHandler installed and ctx.channel().config().isAutoRead() == false
will stall in 100% of cases no matter what order of "channel active", "write", "flush"
events was.
The use case is following (how Finagle serial dispatchers work):
1. Client writeAndFlushes and waits on a write-promise to perform read() once it's satisfied.
2. A write-promise will only be satisfied once SslHandler finishes with handshaking and
sends the unencrypted queued message.
3. The handshaking process itself requires a number of read()s done by a client but the
SslHandler doesn't request them explicitly assuming that either auto-read is enabled
or client requested at least one read() already.
4. At this point a client will stall with NEED_UNWRAP status returned from underlying engine.
Modifiations:
Always request a read() on NEED_UNWRAP returned from engine if
a) it's handshaking and
b) auto read is disabled and
c) it wasn't requested already.
Result:
SslHandler is now completely tolerant of whether or not auto-read is enabled and client
is explicitly reading a channel.
Motivation:
We should throw a more helpful exception when a non PKCS#8 key is used by the user.
Modifications:
Change exception message to give a hint what is wrong.
Result:
Easier for user to understand whats wrong with their used key.
Motivation:
SSLContext.buildTrustManagerFactory(...) builds a KeyStore to
initialize the TrustManagerFactory from an array of X509Certificates,
assuming that array is a chain and that each certificate will have a
unique Subject Distinguised Name.
However, the collection of certificates used as trust anchors is generally
not a chain (it is an unordered collection), and it is legitimate for it
to contain multiple certificates with the same Subject DN.
The existing code uses the Subject DN as the alias name when filling in
the `KeyStore`, thereby overwriting other certificates with the same
Subject DN in this collection, so some certificates may be discarded.
In addition, the code related to building trust managers can take an array of
X509Certificate instances to use as trust anchors. The variable name is
usually trustCertChain, and the documentation refers to them as a "chain".
However, while it makes sense to talk about a "chain" from a keymanager
point of view, these certificates are just an unordered collection in a
trust manager. (There is no chaining requirement, having the Subject DN
matching its predecessor's Issuer DN.)
This can create confusion to for users not used with PKI concepts.
Modifications:
SSLContext.buildTrustManagerFactory(...) now uses a distinct alias for each
array (simply using a counter, since this name is never used for reference
later). This patch also includes a unit test with CA certificates using the
same Subject DN.
Also renamed trustCertChain into trustCertCollection, and changed the
references to "chain" in the Javadoc.
Result:
Each loaded certificate now has a unique identifier when loaded, so it is
now possible to use multiple certificates with the same Subject DN as
trust anchors.
Hopefully, renaming the parameter should also reduce confusion around PKI
concepts.
Motivation:
We need to ensure we call ctx.flush() before closing the actual channel when an handshake failure took place. If we miss to do so we may not send all pending data to the remote peer which also include SSL alerts.
Modifications:
Ensure we call ctx.flush() before ctx.close() on a handshake error.
Result:
All pending data (including SSL alerts) are written to the remote peer on a handshake error.
Motivation:
We currently not supported using KeyManagerFactory with OpenSslClientContext and so should throw an exception if the user tries to do so. This will at least not give suprising and hard to debug problems later.
Modifications:
Throw exception if a user tries to construct a OpenSslClientContext with a KeyManagerFactory
Result:
Fail fast if the user tries to use something that is not supported.
Motivation:
We need to ensure we do all checks inside of the try / catch block so we free native memory that was allocated in the constructor of the super class in a timely manner.
Modifications:
Move all checks inside of the try block.
Result:
Correctly release native memory (and not depend on the finalizer) when a check in the constructors fails
Motivation:
A user may use a private key which is encrypted with an empty password. Because of this we should only handle a null password in a special way.
Modifications:
- Correctly handle private key that is encrypted with empty password.
- Make OpenSsl*Context implementions consistent in terms of initialization in the constructor.
Result:
Correctly support private key that is encrypted with empty password.
Motivation:
We want to allow the use of an uber jar that contains shared dynamic libraries for all platforms (including fedora).
Modifications:
Modified OpenSsl to try and load the fedora library if the OS is Linux and the platform specified library fails before using the default lib.
Result:
True uber support.
Motivation:
We want to allow the use of an uber jar that contains the shared libraries for all platforms.
Modifications:
Modified OpenSsl to first check for a platform-specific lib before using the default lib.
Result:
uber support.
Motivation:
Depending on the actual CertificateException we should set the correct alert type so it will be sent back to the remote peer and so make it easier for them to fix it.
Modification:
Correctly set the alert and not always just use a general alert.
Result:
It's easier for the remote peer to fix the problems.
Motivation:
Commit 108dc23cab introduced a workaround due to a JDK crash when GCM cipher was used during an unwrap operation. Attempting to reproduce this issue with the latest JDK (1.8.0_72-b15) demonstrate that this issue no longer exists while it can be reliably reproduced on earlier JDKs (1.8.0_25-b17 and earlier)
Modifications:
- Remove the copy-to-heap-buffer workaround for JDK engine
Result:
Fixes https://github.com/netty/netty/issues/3256
Motivation:
Sometimes it's easier to get keys/certificates as `InputStream`s than it is to
get an actual `File`. This is especially true when operating in a container
environment and `getResourceAsInputStream` is the best way to load resources
packaged with an application.
Modifications:
- Add read-from-`InputStream` methods to `PemReader`
- Allow `SslContext` to get keys/certificates from `InputStreams`
- Add `InputStream`-based setters for key/trust managers to `SslContextBuilder`
Result:
Callers may pass an `InputStream` instead of a `File` to `SslContextBuilder`.
Motivation:
OpenSslContext constructor fails with a UnsupportedOperationException if Unsafe is not present on the system.
Modifications:
Make OpenSslContext work also when Unsafe is not present by fallback to using JNI to get the memory address.
Result:
Using OpenSslContext also works on systems without Unsafe.
Motivation:
We need to enable SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER when using OpenSslContext as the memory address of the buffer that is passed to OpenSslEngine.wrap(...) may change during calls and retries. This is the case as
if the buffer is a heap-buffer we will need to copy it to a direct buffer to hand it over to the JNI layer. When not enable this mode we may see errors like: 'error:1409F07F:SSL routines:SSL3_WRITE_PENDING: bad write retry'.
Related to https://github.com/netty/netty-tcnative/issues/100.
Modifications:
Explitict set mode to SSL.SSL_MODE_RELEASE_BUFFERS | SSL.SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER . (SSL.SSL_MODE_RELEASE_BUFFERS was used before implicitly).
Result:
No more 'error:1409F07F:SSL routines:SSL3_WRITE_PENDING: bad write retry' possible when writing heap buffers.
Motivation:
When using SslProvider.OPENSSL we currently not handle SNI on the client side.
Modifications:
Correctly enable SNI when using clientMode and peerHost != null.
Result:
SNI works even with SslProvider.OPENSSL.
Motivation:
See #3411. A reusable ArrayList in InternalThreadLocalMap can avoid allocations in the following pattern:
```
List<...> list = new ArrayList<...>();
add something to list but never use InternalThreadLocalMap
return list.toArray(new ...[list.size()]);
```
Modifications:
Add a reusable ArrayList to InternalThreadLocalMap and update codes to use it.
Result:
Reuse a thread local ArrayList to avoid allocations.
Motivation:
When an SSL record contains an invalid extension data, SniHandler
currently throws an IndexOutOfBoundsException, which is not optimal.
Modifications:
- Do strict index range checks
Result:
No more unnecessary instantiation of exceptions and their stack traces
Motivation:
Not all SSLEngine implementations permit beginHandshake being called while a handshake is in progress during the initial handshake. We should ensure we only go through the initial handshake code once to prevent unexpected exceptions from being thrown.
Modifications:
- Only call beginHandshake if there is not currently a handshake in progress
Result:
SslHandler's handshake method is compatible with OpenSSLEngineImpl in Android 5.0+ and 6.0+.
Fixes https://github.com/netty/netty/issues/4718
Motivation:
We incorrectly added the trustCertChain as certificate chain when OpenSslClientContext was created. We need to correctly add the keyCertChain.
Modifications:
Correctly add whole keyCertChain.
Result:
SSL client auth is working when usin OpenSslClientContext and more then one cert is contained in the certificate chain.
Motivation:
Attempts to enable SSL protocols which are currently disabled fail when using the OpenSslEngine. Related to https://github.com/netty/netty/issues/4736
Modifications:
Clear out all options that have disabled SSL protocols before attempting to enable any SSL protocol.
Result:
setEnabledProtocols works as expected.
Motivation:
We need to ensure we flush out all pending data when an SslException accours so the remote peer receives all alerts.
Modifications:
Ensure we call ctx.flush() when needed.
Result:
Correctly receive alerts in all cases on the remote peer.
Motivation:
We need to ensure we add the correct handshake error to the SSLHandshakeException before throwing it when failing the
handshake.
Modifications:
Use the correct error string when creating the SSLHandshakeException.
Result:
Correct SSLHandshakeException message included.
Motivation:
Sometimes a user want to do async mappings in the SniHandler as it is not possible to populate a Mapping up front.
Modifications:
Add AsyncMapping interface and make SniHandler work with it.
Result:
It is possible to do async mappings for SNI
Motivation:
As we can only handle handshake commands to parse SNI we should try to skip alert and change cipher spec commands a few times before we fallback to use a default SslContext.
Modifications:
- Use default SslContext if no application data command was received
- Use default SslContext if after 4 commands we not received a handshake command
- Simplify code
- Eliminate multiple volatile fields
- Rename SslConstants to SslUtils
- Share code between SslHandler and SniHandler by moving stuff to SslUtils
Result:
Correct handling of non handshake commands and cleaner code.
Motivation:
Android 5.0 (API version 21) has a bug which not correctly set the bytesConsumed of SSLEngineResult when HandshakeStatus is FINISHED. Because of this we need to special handle the status and so workaround the Android bug.
Modifications:
- Break the unwrap for (;;) loop when HandshakeStatus is FINISHED and bytesConsumed == 0 && bytesProduced == 0.
Result:
SslHandler works with all known version of Android.
Motivation:
There are a few buffer leaks related to how Unpooled.wrapped and Base64.encode is used.
Modifications:
- Fix usages of Bas64.encode to correct leaks
- Clarify interface of Unpooled.wrapped* to ensure reference count ownership is clearly defined.
Result:
Reference count code is more clearly defined and less leaks are possible.
Motivation:
We need to ensure we only add the OpenSslEngine to the OpenSslEngineMap when the handshake is started as otherwise we may produce a memory leak when the OpenSslEngine is created but not actually used. This can for example happen if we encounter a connection refused from the remote peer. In this case we will never remove the OpenSslEngine from the OpenSslEngineMap and so it will never be collected (as we hold a reference). This has as affect that the finalizer will never be run as well.
Modifications:
- Lazy add the OpenSslEngine to the OpenSslEngineMap to elimate possible leak.
- Call OpenSslEngine.shutdown() when SslHandler is removed from the ChannelPipeline to free memory asap in all cases.
Result:
No more memory leak with OpenSslEngine if connection is refused.
Motivation:
- Javadoc is not correct (#4353)
- WriteTimeoutHandler does not always cancel the timeout task (#2973)
Modifications:
Fix the javadoc and cleanup timeout task in handlerRemoved
Result:
WriteTimeoutHandler's javadoc describes the correct behavior and it will cancel timeout tasks when it's removed.
Motivation:
As we not used Unpooled anymore for allocate buffers in Base64.* methods we need to ensure we realease all the buffers.
Modifications:
Correctly release buffers
Result:
No more buffer leaks
Motivation:
Javadoc reports errors about invalid docs.
Modifications:
Fix some errors reported by javadoc.
Result:
A lot of javadoc errors are fixed by this patch.
Motivation:
There are some wrong links and tags in javadoc.
Modifications:
Fix the wrong links and tags in javadoc.
Result:
These links will work correctly in javadoc.
