Andrew Stitcher created PROTON-933:
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             Summary: Cyrus SASL GSSAPI plugin can error if sent long buffers.
                 Key: PROTON-933
                 URL: https://issues.apache.org/jira/browse/PROTON-933
             Project: Qpid Proton
          Issue Type: Bug
          Components: proton-c
    Affects Versions: 0.10
            Reporter: Andrew Stitcher
            Assignee: Andrew Stitcher
            Priority: Blocker


Cyrus SASL GSSAPI is not able to handle buffers in the advertised way -
Even if you limit the amount of data to decode on the server side to the 
SASL_MAXOUTBUF value that it reports it can fail with a syslog of (for example):
{quote}
Jul  6 13:32:38 proton msgr-recv: encoded packet size too big (32828 > 32768)
{quote}
It appears that the decode routine can coalesce received buffers, and in fact 
its actual requirement is that you may not _encode_ on the _client_ any more 
than the value returned on the server. However the value of SASL_MAXOUTBUF that 
is returned on the client is 60 bytes bigger than the value returned on the 
server.

The workaround is to subract 60 bytes from the value on the returned on the 
client before using it.



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