Re: [squid-users] Local Squid

Eliezer Croitoru <eliezer_at_ngtech.co.il> 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
>>
Received on Sun Sep 22 2013 - 23:20:42 MDT