[Freeswitch-users] WSS SSL errors "decryption failed or bad record mac" under load

Thu May 11 23:12:32 UTC 2017

Its just in our isolated lab, pretty normal dell xeon server running Jessie
8.6.  I just want to get it building on the same box I am testing with so
setting that all up.

I was able to reproduce it w/o DTLS/Srtp.  here is a much simpler and
cleaned up version of the python script.

On Thu, May 11, 2017 at 4:34 PM, Michael Jerris <mike at jerris.com> wrote:

> what is “this environment” ?
>
> On May 11, 2017, at 6:31 PM, Luke Wahlmeier <lwahlmeier at gmail.com> wrote:
>
> Yeah I can usually get it to happen within about 5 minutes or so of
> testing.  Still getting all setup to build freeswitch in this environment,
> but I should have it working by tomorrow.  I will try more w/o dtls/srtp as
> well and make sure it does not need to be on.
>
> Thanks
> Luke
>
> On Thu, May 11, 2017 at 4:20 PM, Michael Jerris <mike at jerris.com> wrote:
>
>> if you can reproduce this reliably, i’d try master as well.  Unless this
>> is a bug in openssl, i can’t imagine how dtls would come into play in
>> something like this.
>>
>> > On May 11, 2017, at 5:48 PM, Luke Wahlmeier <lwahlmeier at gmail.com>
>> wrote:
>> >
>> > I keep semi-regularly running into issues using the wss transport when
>> using dtls/strp/ice.  This is on the latest 1.6.17~34~0fc0946 on Debian
>> jessie, but I am pretty sure it was happening on the last couple releases
>> as well.
>> >
>> > It seems like something bad/wrong happens to the encrypted data going
>> over the websocket coming from freeswitch when more then 1 websocket
>> connection are going and so far ice/srtp/dtls also seem to be needed in the
>> invite to duplicate it.
>> >
>> > I have tried many different languages and network/ssl stacks and keep
>> running into this.  It is always on data coming in from freeswitch on the
>> websocket connection, and its very very random.  Sometimes I will get it 20
>> times in a row, other times it takes thousands of connections/sessions
>> before it happen.  It also, obviously, completely goes away if I use plain
>> ws instead wss.
>> >
>> > Here are the errors:
>> > python:
>> > SSLError: [SSL: DECRYPTION_FAILED_OR_BAD_RECORD_MAC] decryption failed
>> or bad record mac (_ssl.c:1750)
>> > c/c++ (stunnel4):
>> > SSL_read: 1408F119: error:1408F119:SSL routines:SSL3_GET_RECORD:decryption
>> failed or bad record mac
>> > Java:
>> > java.lang.IllegalArgumentException: Bad arguments
>> >     at javax.crypto.Mac.update(Mac.java:509)
>> >     at sun.security.ssl.MAC.compute(MAC.java:135)
>> >     at sun.security.ssl.InputRecord.checkMacTags(InputRecord.java:265)
>> >     at sun.security.ssl.InputRecord.decrypt(InputRecord.java:216)
>> >     at sun.security.ssl.EngineInputRecord.decrypt(EngineInputRecord
>> .java:177)
>> >     at sun.security.ssl.SSLEngineImpl.readRecord(SSLEngineImpl.
>> java:974)
>> >     at sun.security.ssl.SSLEngineImpl.readNetRecord(SSLEngineImpl.
>> java:907)
>> >     at sun.security.ssl.SSLEngineImpl.unwrap(SSLEngineImpl.java:781)
>> >     at javax.net.ssl.SSLEngine.unwrap(SSLEngine.java:624)
>> >
>> > Attached are a simple python script to do the load, my dialplan and
>> sip_profile.  The python script can take a few runs before it see the
>> error, and I know its not completing the sip or rtp, but even if it does
>> this still happens.
>> >
>> > I have also looked at libsofia-sip-ua/tport/ws.c and I dont see
>> anything obvious.  I am getting setup to build v1.6 head and test this any
>> guidance on ways I can trouble shoot this better or requests for more info
>> are very welcome.
>> >
>>
>
>
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