I remeber trying this kind of stuff before but the better option is to use the forward_proxy settings. the basic http_proxy works kind of fine for most apps. on what OS are you trying to do so? In a flight I would read a book or offline content since it's a flight and I will want to do something else but.. this is my angle. Eliezer On 09/23/2013 02:20 AM, Shawn Wilson wrote: > > > Eliezer Croitoru <eliezer@xxxxxxxxxxxx> wrote: >> 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.. > > Yeah, that's what I have. I split it up because the former is what I was looking at a cli to enable it and the later is iptables-save without counters (-c iirc). I guess it added confusion - sorry. > >> >> if it's on the local machine why do you need exactly to intercept the >> traffic?(curios)? > > Mainly for better traffic monitoring but also to have a minimal local cache when on a plane, to learn squid, to play with webapps. > >> >> 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. >> > Hummm, didn't know about intercept. I've tried both with and without transparent on 3128 (though I'm not sure how this is supposed to work without transparent as I'm only passing it a url and not http://proxy/url? > > >> 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 >>> >
