Christian Klauser created HTTPCORE-442:
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Summary: SSLIOSession + ChunkDecoder:
MalformedChunkCodingException with last chunk left in inEncryptedBuffer
Key: HTTPCORE-442
URL: https://issues.apache.org/jira/browse/HTTPCORE-442
Project: HttpComponents HttpCore
Issue Type: Bug
Reporter: Christian Klauser
Attachments: httpcore-nio-SSLIOSession-eof.path
I'm running into a rather esoteric problem when reading the response to an HTTP
request using {{httpcore-nio}} (used via CXF). On a high level we get a
MalfromedChunkCodingException because the ChunkDecoder doesn't receive the last
chunk ( {{"0\r\n\r\n"}} is missing ) We see the following situation:
* The plain text content fed into the SOAP/JAXB deserialization machinery cuts
off mid-way through
* *because* the {{ChunkDecoder}} threw a {{MalformedChunkCodingException}}'
* *because* {{this.buffer.readLine}} returned false
* *because* (not 100% sure here) {{fillBufferFromChannel}} returned -1 and we
are looking for the next chunk size
* *because* the last 106 bytes of the encrypted stream (see below) have never
been decrypted
* *because* the loop inside {{SSLIOSession#decryptData}} gets exited early if
the {{SSLIOSession#endOfStream}} flag is set _even if the input stream still
contains encrypted data_
{code}
state of the SSLIOSession in `this.channel` when the exception occurs:
192.168.13.204:48888<->10.0.29.106:443[ACTIVE][r:r][ACTIVE][r][NOT_HANDSHAKING][EOF][][106][0][0][0]
{code}
Looking at past issues/commit messages, I understand why we have an early exit
here (avoid infinite loops on connections that broke in the middle of a TLS
packet). I'm not sure if just exiting is correct here. The documentation for
the java
[{{SSLEngine#unwrap}}|https://docs.oracle.com/javase/8/docs/api/javax/net/ssl/SSLEngine.html]
method says that the engine tries to decrypt "one complete TLS network
packet". There is no guarantee that it decrypts all remaining packets in the
buffer.
In our particular case (106 still encrypted bytes), we have to run the
{{unwrap}} method two more times until we have the complete response from the
server (including the final chunk "{{0\r\n\r\n}}"). After the first additional
call, there are still 53 encrypted bytes left.
I have attached a patch that solves this issue for us. The patch monitors
whether the decryption loop is making progress and keeps looping even if
{{endOfStream}} is set. It aborts after a number of iterations without clear
progress. With this patch, we can run our entire integration test suite without
error. Without this patch, about 1 in SOAP 200 calls fails.
The "progress measurement" logic could perhaps be simplified (only measure
plain bytes, not also consumed encrypted bytes), but I'm not sure if that would
still be correct.
I could also imagine that the actual bug is in the ChunkDecoder, that doesn't
give the Channel another chance at filling the buffer, but the SSLIOSession
code looks more suspicious to me (signalling EOF with 106 bytes left encrypted).
What do you think?
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