[openssl-users] OpenSSL non-blocking epoll hanging on data receiving

Jakob Bohm jb-openssl at wisemo.com
Tue May 31 15:43:26 UTC 2016

On 27/05/2016 18:29, Matt Caswell wrote:
> On 27/05/16 16:20, counterpoint wrote:
>> Thanks Matt, good points. Not easy to implement though!
>> In the problem case, my code is the server (it is a proxy), and the standard
>> MariaDB command line client is the client. Yes, it does look as if
>> everything is happening as it should, except that the process stops before
>> all the data has been handled.
>> The client is sending a large query (about 500 KB, using "load data local
>> infile '/root/bigdata.txt' into table upload;").
>> If the client is connected directly to the database, using SSL, the query
>> runs successfully.
>> If the client is connected through the proxy without SSL (most of the logic
>> exactly the same), the query runs successfully.
>> If a shorter query is chosen, it works with SSL.
>> Looking at the data flows with Wireshark, it looks about right, but I can't
>> see the data in detail because of the SSL :)
> Perhaps using an eNULL ciphersuite might help?
> Matt
For future reference, another way is to load your private
key into WireShark.  This works for all but the EDH/ECDH
suites that provide PFS security against enemies who steal
your private key and then decrypt previously recorded
TLS/SSL sessions.


Jakob Bohm, CIO, Partner, WiseMo A/S.  https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark.  Direct +45 31 13 16 10
This public discussion message is non-binding and may contain errors.
WiseMo - Remote Service Management for PCs, Phones and Embedded

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