Date: Wed, 29 Jun 2016 11:33:24 +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: <20160629113324.GA10436@beagle.bcn.sia.es> In-Reply-To: <2822287D-FE6F-4A4B-995A-639B696911DF@FreeBSD.org> References: <20160628130759.GA13226@beagle.bcn.sia.es> <2822287D-FE6F-4A4B-995A-639B696911DF@FreeBSD.org>
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On Tue 28.Jun'16 at 19:37:37 +0200, Kristof Provost wrote: >=20 >=20 > 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: > >=20 > > 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 > >=20 > > At first stage it seems that these rules works, but don't. Traffic is > > redirected to squid, but squid denies all connections: > >=20 > > 1467111934.502 1 172.22.55.1 TCP_DENIED/403 4221 GET > > http://www.osnews.com/ - HIER_NONE/- text/html > >=20 > > 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. > >=20 > You may have a different squid version, or they may be patched differentl= y. > Your redirect rules are working, as demonstrated by the fact that squid g= ets > a request, and replies to it. >=20 > 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=E2=80=99s a Sq= uid > problem. >=20 > Also note that you=E2=80=99re 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: >=20 > The packets will not be modified, so getsockname(2) on the socket will > return > the original destination address of the packet. >=20 > That might be affecting an ACL in Squid. >=20 > Regards, > Kristof Thanks Kristof. I am using squid installed from pkg under a FreeBSD 10.3, f= ully updated: Squid Cache: Version 3.5.19 Service Name: squid configure options: '--with-default-user=3Dsquid' '--bindir=3D/usr/local/sb= in' '--sbindir=3D/usr/local/sbin' '--datadir=3D/usr/local/etc/squid' '--lib= execdir=3D/usr/local/libexec/squid' '--localstatedir=3D/var' '--sysconfdir= =3D/usr/local/etc/squid' '--with-logdir=3D/var/log/squid' '--with-pidfile= =3D/var/run/squid/squid.pid' '--with-swapdir=3D/var/squid/cache' '--without= -gnutls' '--enable-auth' '--enable-build-info' '--enable-loadable-modules' = '--enable-removal-policies=3Dlru heap' '--disable-epoll' '--disable-linux-n= etfilter' '--disable-linux-tproxy' '--disable-translation' '--disable-arch-= native' '--enable-eui' '--enable-cache-digests' '--enable-delay-pools' '--d= isable-ecap' '--disable-esi' '--enable-follow-x-forwarded-for' '--enable-ht= cp' '--enable-icap-client' '--enable-icmp' '--enable-ident-lookups' '--enab= le-ipv6' '--enable-kqueue' '--with-large-files' '--enable-http-violations' = '--without-nettle' '--enable-snmp' '--enable-ssl' '--with-openssl=3D/usr' '= LIBOPENSSL_CFLAGS=3D-I/usr/include' 'LIBOPENSSL_LIBS=3D-lcrypto -lssl' '--e= nable-ssl-crtd' '--disable-stacktraces' '--enable-ipf-transparent' '--enabl= e-ipfw-transparent' '--enable-pf-transparent' '--with-nat-devpf' '--enable-= forw-via-db' '--enable-wccp' '--enable-wccpv2' '--with-heimdal-krb5=3D/usr'= 'CFLAGS=3D-I/usr/include -O2 -pipe -fstack-protector -fno-strict-aliasing= ' 'LDFLAGS=3D-L/usr/lib -pthread -fstack-protector' 'LIBS=3D-lkrb5 -lgssa= pi -lgssapi_krb5 ' 'KRB5CONFIG=3D/usr/bin/krb5-config' '--enable-auth-basic= =3DDB SMB_LM MSNT-multi-domain NCSA PAM POP3 RADIUS fake getpwnam NIS' '--e= nable-auth-digest=3Dfile' '--enable-external-acl-helpers=3Dfile_userip time= _quota unix_group' '--enable-auth-negotiate=3Dkerberos wrapper' '--enable-a= uth-ntlm=3Dfake smb_lm' '--enable-storeio=3Daufs diskd rock ufs' '--enable-= disk-io=3DDiskThreads DiskDaemon AIO Blocking IpcIo Mmapped' '--enable-log-= daemon-helpers=3Dfile' '--enable-url-rewrite-helpers=3Dfake' '--enable-stor= eid-rewrite-helpers=3Dfile' '--prefix=3D/usr/local' '--mandir=3D/usr/local/= man' '--infodir=3D/usr/local/info/' '--build=3Damd64-portbld-freebsd10.1' '= build_alias=3Damd64-portbld-freebsd10.1' 'CC=3Dcc' 'CPPFLAGS=3D' 'CXX=3Dc++= ' 'CXXFLAGS=3D-O2 -pipe -fstack-protector -fno-strict-aliasing ' 'CPP=3Dcpp= ' --enable-ltdl-convenience According to this options, intercept is enabled ... Then, I don't understa= nd why it doesn't works ... --=20 Greetings, C. L. Martinez
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