Hello, i think if you set: iptables -t nat -A OUTPUT -p tcp --dport 80 -j REDIRECT --to-port 3128 each output request (included squid requests) are nated to local 3128 port. -- Best regards, Loïc BLOT, UNIX systems, security and network engineer http://www.unix-experience.fr Le dimanche 22 septembre 2013 à 08:58 -0400, shawn wilson a écrit : > I'm trying to setup a transparent proxy on my local machine. This > works when I give Firefox proxy info, but this fails when I get > iptables to redirect with (the rule I keep turning on/off): > iptables -t nat -A OUTPUT -p tcp --dport 80 -j REDIRECT --to-port 3128 > > And the rest of the nat table is just: > *nat > -A OUTPUT -m owner --uid-owner 31 -j ACCEPT > COMMIT > > When this is enabled, I just get: > ERROR > > The requested URL could not be retrieved > > and "Invalid URL" > Which is a squid message and I'm seeing the requests in the access log > but I'm guessing something needs to be rewritten that isn't or squid > is doing too much. > > swlap1 ~ # squid -v > Squid Cache: Version 3.3.8 > configure options: '--prefix=/usr' '--build=x86_64-pc-linux-gnu' > '--host=x86_64-pc-linux-gnu' '--mandir=/usr/share/man' > '--infodir=/usr/share/info' '--datadir=/usr/share' '--sysconfdir=/etc' > '--localstatedir=/var/lib' '--libdir=/usr/lib64' > '--disable-dependency-tracking' '--sysconfdir=/etc/squid' > '--libexecdir=/usr/libexec/squid' '--localstatedir=/var' > '--with-pidfile=/run/squid.pid' '--datadir=/usr/share/squid' > '--with-logdir=/var/log/squid' '--with-default-user=squid' > '--enable-removal-policies=lru,heap' > '--enable-storeio=aufs,diskd,rock,ufs' '--enable-disk-io' > '--enable-auth' > '--enable-auth-basic=MSNT,MSNT-multi-domain,NCSA,POP3,getpwnam,PAM' > '--enable-auth-digest=file' '--enable-auth-ntlm=none' > '--enable-auth-negotiate=none' > '--enable-external-acl-helpers=file_userip,session,unix_group' > '--enable-log-daemon-helpers' '--enable-url-rewrite-helpers' > '--enable-cache-digests' '--enable-delay-pools' '--enable-eui' > '--enable-icmp' '--enable-follow-x-forwarded-for' '--enable-esi' > '--with-large-files' '--disable-strict-error-checking' > '--without-libcap' '--enable-ipv6' '--disable-snmp' '--enable-ssl' > '--disable-ssl-crtd' '--disable-icap-client' '--disable-ecap' > '--enable-linux-netfilter' 'build_alias=x86_64-pc-linux-gnu' > 'host_alias=x86_64-pc-linux-gnu' 'CC=x86_64-pc-linux-gnu-gcc' > 'CFLAGS=-march=native -freorder-blocks-and-partition -O2 -pipe' > 'LDFLAGS=-Wl,-O1 -Wl,--as-needed' 'CXXFLAGS=-march=native > -freorder-blocks-and-partition -O2 -pipe' > 'PKG_CONFIG_PATH=/usr/lib64/pkgconfig' > > /etc/squid/squid.conf: > > # > # Recommended minimum configuration: > # > > # Example rule allowing access from your local networks. > # Adapt to list your (internal) IP networks from where browsing > # should be allowed > acl localnet src 10.0.0.0/8 # RFC1918 possible internal network > acl localnet src 172.16.0.0/12 # RFC1918 possible internal network > acl localnet src 192.168.0.0/16 # RFC1918 possible internal network > acl localnet src fc00::/7 # RFC 4193 local private network range > acl localnet src fe80::/10 # RFC 4291 link-local (directly > plugged) machines > > acl SSL_ports port 443 > acl Safe_ports port 80 # http > acl Safe_ports port 21 # ftp > acl Safe_ports port 443 # https > acl Safe_ports port 70 # gopher > acl Safe_ports port 210 # wais > acl Safe_ports port 1025-65535 # unregistered ports > acl Safe_ports port 280 # http-mgmt > acl Safe_ports port 488 # gss-http > acl Safe_ports port 591 # filemaker > acl Safe_ports port 777 # multiling http > acl Safe_ports port 901 # SWAT > acl CONNECT method CONNECT > > # > # Recommended minimum Access Permission configuration: > # > # Deny requests to certain unsafe ports > http_access deny !Safe_ports > > # Deny CONNECT to other than secure SSL ports > http_access deny CONNECT !SSL_ports > > # Only allow cachemgr access from localhost > http_access allow localhost manager > http_access deny manager > > # We strongly recommend the following be uncommented to protect innocent > # web applications running on the proxy server who think the only > # one who can access services on "localhost" is a local user > #http_access deny to_localhost > > # > # INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS > # > acl localhost src 127.0.0.1/32 ::1 > acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1 > > > # Example rule allowing access from your local networks. > # Adapt localnet in the ACL section to list your (internal) IP networks > # from where browsing should be allowed > http_access allow localnet > http_access allow localhost > > # And finally deny all other access to this proxy > http_access deny all > > # Squid normally listens to port 3128 > http_port 3128 transparent > > # Uncomment and adjust the following to add a disk cache directory. > #cache_dir ufs /var/cache/squid 100 16 256 > > # Leave coredumps in the first cache dir > coredump_dir /var/cache/squid > > # > # Add any of your own refresh_pattern entries above these. > # > refresh_pattern ^ftp: 1440 20% 10080 > refresh_pattern ^gopher: 1440 0% 1440 > refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 > refresh_pattern . 0 20% 4320
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