[squid-users] Skype Issues

[Renato Jop]

Thank you both for your valuable help.
I've configured the tls-dh param with a strong Diffie-Hellman group (2048
bits) and configured the cipher as Yuri specified and I was able to get
pass the unknown cipher, however now I get a "SSL
routines:SSL3_GET_RECORD:wrong version number". Here's the configuration I
changed:
 cipher=HIGH:MEDIUM:RC4:3DES:!aNULL:!eNULL:!LOW:!MD5:!EXP:!PSK:!SRP:!DSS
dhparams=/etc/dh-parameters.2048 options=NO_SSLv2,NO_SSLv3,SINGLE_DH_USE
tls-dh=/usr/local/etc/squid/dhparams.pem



Renato Jop

On Sat, Jun 25, 2016 at 11:34 AM, Yuri Voinov <yvoinov at gmail.com> wrote:

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> 25.06.2016 23:09, Amos Jeffries пишет:
> > On 26/06/2016 4:32 a.m., Yuri Voinov wrote:
> >>
> >> Amos, you are a wrong.
> >>
> >> No Squid-4. It's unstable and not ready for production. Whenever it's
> >> features.
> >
> > So some beta software has bugs therefore nobody should ever use it for
> > anything. I find that to be a strange and sad view of the world.
> >
> > Care to guess why I listed it as the last option amongst several?
> >  Or why 4.0.11 exists as a beta still?
> > It *is* an option for the mentioned problem(s) though whatever its
> utility.
> Agreed.
> >
> >
> >
> >>
> >> Some time ago I have the same issue and know what happens exactly.
> >>
> >> Skype initial connection site uses RC4 cipher. Which is disabled in most
> >> squid's configuration.
> >
> > Your "know what happens exactly" differs from at least two other peoples
> > debugging experiences with Skype.
> >
> > RC4 is on the hitlist for most of the big vendors for the past year or
> > so. IIRC there were several Windows Updates to remove it and other
> > broken bits from a lot of things over the past year.
> > If Skype is still using RC4 it might be part of this problem.
> I'm sure this is problem and this problem exists. MS do nothing to make
> they sites/services more secure. BTW, MS Updates uses RC4 ciphers itself
> this time. With strong siphers there is no way to setup WU via Squid.
> I've spent much time to identify this problem in my setup and find
> working workaround.
>
> Another part of problem is: MS often uses it's own self-signed roots,
> which is exists in Windows, but nowhere else. And which has not
> cross-signed by well-known root CA's. They think it make MS services
> more secure. They wrong. But we can't do anything with it. So, this is
> forced us to add self-signed MS roots to our Squid's CA bundles to
> bump/splice.
> >
> >
> >>
> >> To make it works (as by as most M$ update sites) it's require simple use
> >> this cipher's suite:
> >>
> >> HIGH:MEDIUM:RC4:3DES:!aNULL:!eNULL:!LOW:!MD5:!EXP:!PSK:!SRP:!DSS
> >>
> >> That works for me in 5 SSL bumped setups. There is no matter which squid
> >> version installed.
> >
> > Thank you. Thats another option then. I'd rate that below trying the EC
> > ciphers, and above library updates.
> You are welcome.
>
> Just for information: MS has own IT infrastructure, with some strange
> configured and non well-managed elements. I can't guarantee this
> workaround will work everywhere or for every MS service.
>
> When I made my research, I've seen some strange security TLS
> combinations on MS sites/services. I.e., for example, RC4+ECDSA+TLSv1.2.
> Or, for example, RC4+MD5+TLSv1. And some similar. Very idiotic and
> potentially dangerous combinations. And - they support ignores all
> requests. As usual.
>
> To my regret, I can not order all of its users to abandon the use of
> Windows. So far, in my infrastructure have machines with Windows XP.
>
> With this nothing can be done, it is necessary only to weaken the
> security - for the sake of compatibility.
> >
> >
> > Amos
> > _______________________________________________
> > squid-users mailing list
> > squid-users at lists.squid-cache.org
> > http://lists.squid-cache.org/listinfo/squid-users
>
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