Re: [squid-users] Filters in terminal but not in Browser

On 11/30/2011 06:41 PM, Amos Jeffries wrote:
> On Wed, 30 Nov 2011 17:07:54 -0600, Paul Crown wrote:
>> Greetings,
>>
>> I feel I am missing something simple. I have installed squid3 on
>> Ubuntu. I added
>>
>> acl allow_domains dstdomain "/etc/squid3/always_direct.acl"
>> always_direct allow allow_domains
>>
>> acl denied_domains dstdomain "/etc/squid3/denied_domains.acl"
>> http_access deny denied_domains
>>
>> and populated both files accordingly, and restarted squid3.
>>
>> Now from a terminal, curl good-url and it works. curl bad-url and it
>> gives me the blocked message.
>>
>> Try it in firefox, and good-url and bad-url both work fine. Neither is
>> blocked.
>>
>> What did I forget?
>>
>> Thanks.
>>
>> Paul
>
> What you are missing is two details:
>
> Firstly, http_access and always_direct are completely unrelated controls.
> - http_access determins whether Squid is allowed to service the request.
> - always_direct determines whether Squid MUST (versus MAY) service the
> request using DNS lookups and going directly to the public origin
> server(s).
>
> Also, you are missing minor details about the URL being tested. ie
> - whether the browse is automatically adding "www." in front of the
> domain, or not
> - whether curl is setting the HTTP/1.1 Host: header correctly, or not
> - whether the browse and terminal tools were run on the same machine, or
> not
> - whether you have any other access controls affecting the requests (ie
> a browser type ACL allowing Mozilla/* agents through before these controls)
>
> Amos
>

Thanks Amos.

That makes sense.

I got the browser working by configuring proxy settings in the browser
to port 3128.

I was trying to do transparent interception without changing the browser
(otherwise some employees are going to change it back). So, I am still
showing my lack of understanding regarding transparent http access.
Must I also redirect port 80 to 3128 such as in iptables to not have to
config the browser?

Paul

For ref:

squid3 3.0.STABLE19-1
Ubuntu 10.04.2 LTS 64-bit

/etc/squid3/squid.conf
acl manager proto cache_object
acl localhost src 127.0.0.1/32
acl to_localhost dst 127.0.0.0/8 0.0.0.0/32
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 CONNECT method CONNECT
acl denied_domains dstdomain "/etc/squid3/denied_domains.acl"
http_access allow manager localhost
http_access deny manager
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access deny denied_domains
http_access allow localhost
http_access deny all
icp_access deny all
htcp_access deny all
http_port 3128 transparent
hierarchy_stoplist cgi-bin ?
access_log /var/log/squid3/access.log squid
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern (cgi-bin|\?) 0 0% 0
refresh_pattern . 0 20% 4320
icp_port 3130
error_directory /var/www/squid3
acl data_urls dstdomain "/etc/squid3/always_direct.acl"
always_direct allow data_urls
always_direct deny all
coredump_dir /var/spool/squid3

/etc/squid3/always_direct.acl
.amazonaws.com
.google.com

/etc/squid3/denied_domains.acl
.evony.com
.myspace.com
.pogo.com
.facebook.com
.twitter.com
.zynga.com
Received on Thu Dec 01 2011 - 19:49:42 MST