Hey, I wont ask why do you need it but you need to first allow (ACCEPT) the UID of the proxy user and then intercept the local port 80 traffic iptables -t nat -A OUTPUT -m owner --uid-owner 31 -j ACCEPT iptables -t nat -A OUTPUT -p tcp --dport 80 -j REDIRECT --to-port 3129 (ALLL THE ABOVE is only if the UID of the proxy user is 31.. if it's on the local machine why do you need exactly to intercept the traffic?(curios)? and try with 3.3.8 to use: http_port 127.0.0.1:3128 http_port 3129 intercept just to make sure that there is no collision between the two purposes of the port. Eliezer On 09/22/2013 03:58 PM, shawn wilson wrote: > 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 >
