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Date:      Wed, 29 Jun 2016 13:55:30 +0000
From:      "C. L. Martinez" <carlopmart@gmail.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: Problems with pf rules for intercept squid proxy
Message-ID:  <20160629135530.GA14559@beagle.bcn.sia.es>
In-Reply-To: <CALfReyeyzU-J8iwa9iYsBefSTyb6eQTD=JYqWqy3o09-UBhSBg@mail.gmail.com>
References:  <20160628130759.GA13226@beagle.bcn.sia.es> <2822287D-FE6F-4A4B-995A-639B696911DF@FreeBSD.org> <20160629113324.GA10436@beagle.bcn.sia.es> <CALfReycmb%2BtW%2BRZMPiFqUwUbVmG7GbD4vAwt-igriL_i9x4Stw@mail.gmail.com> <20160629131951.GA12552@beagle.bcn.sia.es> <CALfReydN13fzvkQ=Wv84=MD4UpPL7T3uvRrQdTUVO3QWaTNHyw@mail.gmail.com> <CALfReyf97=nAi8X%2B8Z-GwJAXfLdDGXSL_HMW9hEoF6SgYR35bQ@mail.gmail.com> <CALfReyeyzU-J8iwa9iYsBefSTyb6eQTD=JYqWqy3o09-UBhSBg@mail.gmail.com>

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Thanks Krad. And the answer for your questions is: yes. I have restarted FreeBSD hosts after devfs change, my squid's config uses sslbump (it is the same squid.conf file that I use in other OpenBSD host that works as intercept proxy without problems)... My laptop has squid's cert installed and acls are configured ...

 But nothing: it doesn't works.


On Wed 29.Jun'16 at 14:35:02 +0100, krad wrote:
> Also make sure you have opened the squid acl to you local network
> 
> On 29 June 2016 at 14:33, krad <kraduk@gmail.com> wrote:
> 
> > oh also if you are redirecting https you will need to setup squid to do
> > ssl bump and install certs on all your clients. As you havent supplied your
> > squid.conf its difficult to know if thats correct.
> >
> > On 29 June 2016 at 14:32, krad <kraduk@gmail.com> wrote:
> >
> >> you need to as squid needs read write access to the /dev/pf to work in
> >> intercept mode. As long as you dont have any other users in the squid group
> >> you are good. Did you restart devfs or reboot?
> >>
> >>
> >> On 29 June 2016 at 14:20, C. L. Martinez <carlopmart@gmail.com> wrote:
> >>
> >>> Yep, is it not too dangerous to assign 0770 to /dev/pf??
> >>>
> >>> Anyway, I have tried, but with same error: traffic is denied by squid ...
> >>>
> >>>
> >>> On Wed 29.Jun'16 at 13:39:46 +0100, krad wrote:
> >>> > have you got these lines in your /etc/devfs.conf file
> >>> >
> >>> >
> >>> > own     pf      root:squid
> >>> > perm    pf      0770
> >>> >
> >>> > you also need lines like this in the squid.conf
> >>> >
> >>> > http_port 192.168.1.1:3128 intercept
> >>> >
> >>> >
> >>> >
> >>> > On 29 June 2016 at 12:33, C. L. Martinez <carlopmart@gmail.com> wrote:
> >>> >
> >>> > > On Tue 28.Jun'16 at 19:37:37 +0200, Kristof Provost wrote:
> >>> > > >
> >>> > > >
> >>> > > > On 28 Jun 2016, at 15:07, C. L. Martinez wrote:
> >>> > > > >  I have some problems with my pf rules on a FreeBSD 10.3 host
> >>> that acts
> >>> > > > > as a squid intercept proxy. My actual pf rules are:
> >>> > > > >
> >>> > > > > rdr pass on $vpnif proto tcp from $int_network to any port http
> >>> -> lo0
> >>> > > > > port 5144
> >>> > > > > rdr pass on $vpnif proto tcp from $int_network to any port https
> >>> -> lo0
> >>> > > > > port 5145
> >>> > > > >
> >>> > > > >  At first stage it seems that these rules works, but don't.
> >>> Traffic is
> >>> > > > > redirected to squid, but squid denies all connections:
> >>> > > > >
> >>> > > > >  1467111934.502      1 172.22.55.1 TCP_DENIED/403 4221 GET
> >>> > > > > http://www.osnews.com/ - HIER_NONE/- text/html
> >>> > > > >
> >>> > > > >  Using same squid.conf's file under an OpenBSD test machine,
> >>> squid
> >>> > > works
> >>> > > > > without problems. For this reason, I don't think there is some
> >>> problem
> >>> > > > > with my squid's config. The only difference between this OpenBSD
> >>> host
> >>> > > > > and FreeBSD are the pf rules.
> >>> > > > >
> >>> > > > You may have a different squid version, or they may be patched
> >>> > > differently.
> >>> > > > Your redirect rules are working, as demonstrated by the fact that
> >>> squid
> >>> > > gets
> >>> > > > a request, and replies to it.
> >>> > > >
> >>> > > > Note that pf does not change your HTTP payload, it only affects
> >>> TCP. In
> >>> > > > other words: if Squid sees the connection (and it does) it’s a
> >>> Squid
> >>> > > > problem.
> >>> > > >
> >>> > > > Also note that you’re redirecting on FreeBSD, but using divert-to
> >>> on
> >>> > > > OpenBSD.
> >>> > > > This may be triggering different behaviour from Squid. The man
> >>> page says
> >>> > > > that with divert-to:
> >>> > > >
> >>> > > >       The packets will not be modified, so getsockname(2) on the
> >>> socket
> >>> > > will
> >>> > > > return
> >>> > > >       the original destination address of the packet.
> >>> > > >
> >>> > > > That might be affecting an ACL in Squid.
> >>> > > >
> >>> > > > Regards,
> >>> > > > Kristof
> >>> > >
> >>> > > Thanks Kristof. I am using squid installed from pkg under a FreeBSD
> >>> 10.3,
> >>> > > fully updated:
> >>> > >
> >>> > > Squid Cache: Version 3.5.19
> >>> > > Service Name: squid
> >>> > > configure options:  '--with-default-user=squid'
> >>> '--bindir=/usr/local/sbin'
> >>> > > '--sbindir=/usr/local/sbin' '--datadir=/usr/local/etc/squid'
> >>> > > '--libexecdir=/usr/local/libexec/squid' '--localstatedir=/var'
> >>> > > '--sysconfdir=/usr/local/etc/squid' '--with-logdir=/var/log/squid'
> >>> > > '--with-pidfile=/var/run/squid/squid.pid'
> >>> '--with-swapdir=/var/squid/cache'
> >>> > > '--without-gnutls' '--enable-auth' '--enable-build-info'
> >>> > > '--enable-loadable-modules' '--enable-removal-policies=lru heap'
> >>> > > '--disable-epoll' '--disable-linux-netfilter'
> >>> '--disable-linux-tproxy'
> >>> > > '--disable-translation' '--disable-arch-native' '--enable-eui'
> >>> > > '--enable-cache-digests' '--enable-delay-pools' '--disable-ecap'
> >>> > > '--disable-esi' '--enable-follow-x-forwarded-for' '--enable-htcp'
> >>> > > '--enable-icap-client' '--enable-icmp' '--enable-ident-lookups'
> >>> > > '--enable-ipv6' '--enable-kqueue' '--with-large-files'
> >>> > > '--enable-http-violations' '--without-nettle' '--enable-snmp'
> >>> > > '--enable-ssl' '--with-openssl=/usr'
> >>> 'LIBOPENSSL_CFLAGS=-I/usr/include'
> >>> > > 'LIBOPENSSL_LIBS=-lcrypto -lssl' '--enable-ssl-crtd'
> >>> > > '--disable-stacktraces' '--enable-ipf-transparent'
> >>> > > '--enable-ipfw-transparent' '--enable-pf-transparent'
> >>> '--with-nat-devpf'
> >>> > > '--enable-forw-via-db' '--enable-wccp' '--enable-wccpv2'
> >>> > > '--with-heimdal-krb5=/usr' 'CFLAGS=-I/usr/include -O2 -pipe
> >>> > > -fstack-protector -fno-strict-aliasing' 'LDFLAGS=-L/usr/lib  -pthread
> >>> > > -fstack-protector' 'LIBS=-lkrb5 -lgssapi -lgssapi_krb5 '
> >>> > > 'KRB5CONFIG=/usr/bin/krb5-config' '--enable-auth-basic=DB SMB_LM
> >>> > > MSNT-multi-domain NCSA PAM POP3 RADIUS fake getpwnam NIS'
> >>> > > '--enable-auth-digest=file'
> >>> '--enable-external-acl-helpers=file_userip
> >>> > > time_quota unix_group' '--enable-auth-negotiate=kerberos wrapper'
> >>> > > '--enable-auth-ntlm=fake smb_lm' '--enable-storeio=aufs diskd rock
> >>> ufs'
> >>> > > '--enable-disk-io=DiskThreads DiskDaemon AIO Blocking IpcIo Mmapped'
> >>> > > '--enable-log-daemon-helpers=file'
> >>> '--enable-url-rewrite-helpers=fake'
> >>> > > '--enable-storeid-rewrite-helpers=file' '--prefix=/usr/local'
> >>> > > '--mandir=/usr/local/man' '--infodir=/usr/local/info/'
> >>> > > '--build=amd64-portbld-freebsd10.1'
> >>> 'build_alias=amd64-portbld-freebsd10.1'
> >>> > > 'CC=cc' 'CPPFLAGS=' 'CXX=c++' 'CXXFLAGS=-O2 -pipe -fstack-protector
> >>> > > -fno-strict-aliasing ' 'CPP=cpp' --enable-ltdl-convenience
> >>> > >
> >>> > >  According to this options, intercept is enabled ... Then, I don't
> >>> > > understand why it doesn't works ...
> >>> > >
> >>> > > --
> >>> > > Greetings,
> >>> > > C. L. Martinez
> >>> > > _______________________________________________
> >>> > > freebsd-questions@freebsd.org mailing list
> >>> > > https://lists.freebsd.org/mailman/listinfo/freebsd-questions
> >>> > > To unsubscribe, send any mail to "
> >>> > > freebsd-questions-unsubscribe@freebsd.org"
> >>> > >
> >>>
> >>> --
> >>> Greetings,
> >>> C. L. Martinez
> >>> _______________________________________________
> >>> freebsd-questions@freebsd.org mailing list
> >>> https://lists.freebsd.org/mailman/listinfo/freebsd-questions
> >>> To unsubscribe, send any mail to "
> >>> freebsd-questions-unsubscribe@freebsd.org"
> >>>
> >>
> >>
> >

-- 
Greetings,
C. L. Martinez



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