Transparent Proxy help please

exa_gon · May 26, 2016, 9:41 AM

Hi to all,
i've the following problem :

WAN ( internet )
WIFI LAN proxy trasparent
WIFI GUEST LAN proxy trasparent

I've installed squid in transparent way and :
1. configured the proxy inside the browser configuration work
2. access via wifi lan and transparent proxy don't work

Here my configuration for squid.conf :


http_port 10.178.102.10:3128
http_port 10.178.101.10:3128
http_port 10.178.64.45:3128
http_port 127.0.0.1:3128 intercept
icp_port 0
dns_v4_first on
pid_filename /var/run/squid/squid.pid
cache_effective_user squid
cache_effective_group proxy
error_default_language af
icon_directory /usr/local/etc/squid/icons
visible_hostname localhost
cache_mgr it@prontoseat.it
access_log /var/squid/logs/access.log
cache_log /var/squid/logs/cache.log
cache_store_log none
netdb_filename /var/squid/logs/netdb.state
pinger_enable on
pinger_program /usr/local/libexec/squid/pinger

logfile_rotate 60
debug_options rotate=60
shutdown_lifetime 3 seconds
forwarded_for on
uri_whitespace strip

acl dynamic urlpath_regex cgi-bin \?
cache deny dynamic

cache_mem 1024 MB
maximum_object_size_in_memory 32 KB
memory_replacement_policy heap GDSF
cache_replacement_policy heap LFUDA
minimum_object_size 0 KB
maximum_object_size 4 MB
cache_dir ufs /var/squid/cache 1024 16 256
offline_mode off
cache_swap_low 90
cache_swap_high 95
cache allow all
# 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
#Remote proxies

# Setup some default acls
# From 3.2 further configuration cleanups have been done to make things easier and safer. The manager, localhost, and to_localhost ACL definitions are now built-in.
# acl localhost src 127.0.0.1/32
acl allsrc src all
acl safeports port 21 70 80 210 280 443 488 563 591 631 777 901  3128 3129 1025-65535
acl sslports port 443 563

# From 3.2 further configuration cleanups have been done to make things easier and safer. The manager, localhost, and to_localhost ACL definitions are now built-in.
#acl manager proto cache_object

acl purge method PURGE
acl connect method CONNECT

# Define protocols used for redirects
acl HTTP proto HTTP
acl HTTPS proto HTTPS
acl allowed_subnets src 10.178.64.0/24 10.178.101.0/24 10.178.102.0/24
http_access allow manager localhost

http_access deny manager
http_access allow purge localhost
http_access deny purge
http_access deny !safeports
http_access deny CONNECT !sslports

# Always allow localhost connections
# From 3.2 further configuration cleanups have been done to make things easier and safer.
# The manager, localhost, and to_localhost ACL definitions are now built-in.
# http_access allow localhost

request_body_max_size 0 KB
delay_pools 1
delay_class 1 2
delay_parameters 1 -1/-1 -1/-1
delay_initial_bucket_level 100
delay_access 1 allow allsrc

# Reverse Proxy settings
# Custom options before auth

# Setup allowed ACLs
http_access allow allowed_subnets
# Default block all to be sure
http_access deny allsrc

icap_enable on
icap_send_client_ip on
icap_send_client_username on
icap_client_username_encode off
icap_client_username_header X-Authenticated-User
icap_preview_enable on
icap_preview_size 1024

icap_service service_avi_req reqmod_precache icap://127.0.0.1:1344/squid_clamav bypass=off
adaptation_access service_avi_req allow all
icap_service service_avi_resp respmod_precache icap://127.0.0.1:1344/squid_clamav bypass=on
adaptation_access service_avi_resp allow all

Tha Outgoing NAT is disabled and all the rules of firewall are opened from any to any.

here some TCPDUMP :


11:39:31.103032 IP 10.178.101.22.50953 > 54.251.185.0.80: Flags [s], seq 870956397, win 65535, options [mss 1460,sackOK,TS val 18584763 ecr 0,nop,wscale 8], length 0
11:39:31.897679 IP 10.178.101.22.43410 > 93.184.219.82.80: Flags [s], seq 2998714420, win 65535, options [mss 1460,sackOK,TS val 18584842 ecr 0,nop,wscale 8], length 0
11:39:31.915661 IP 10.178.101.22.36045 > 104.124.103.123.80: Flags [s], seq 2949361445, win 65535, options [mss 1460,sackOK,TS val 18584845 ecr 0,nop,wscale 8], length 0
11:39:31.915852 IP 10.178.101.22.57419 > 173.192.220.64.80: Flags [s], seq 1030590641, win 65535, options [mss 1460,sackOK,TS val 18584845 ecr 0,nop,wscale 8], length 0
11:39:31.915864 IP 10.178.101.22.43170 > 104.124.114.245.80: Flags [s], seq 780154735, win 65535, options [mss 1460,sackOK,TS val 18584845 ecr 0,nop,wscale 8], length 0
11:39:31.925744 IP 10.178.101.22.41925 > 104.98.161.166.80: Flags [s], seq 2971572904, win 65535, options [mss 1460,sackOK,TS val 18584846 ecr 0,nop,wscale 8], length 0
11:39:31.925848 IP 10.178.101.22.40907 > 172.217.16.142.80: Flags [s], seq 2351124715, win 65535, options [mss 1460,sackOK,TS val 18584846 ecr 0,nop,wscale 8], length 0
11:39:31.937240 IP 10.178.101.22.37658 > 172.217.16.136.80: Flags [s], seq 427864817, win 65535, options [mss 1460,sackOK,TS val 18584847 ecr 0,nop,wscale 8], length 0
11:39:31.946495 IP 10.178.101.22.41966 > 54.154.106.213.80: Flags [s], seq 4224886699, win 65535, options [mss 1460,sackOK,TS val 18584848 ecr 0,nop,wscale 8], length 0
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exa_gon · May 26, 2016, 5:21 PM

Now worked only with this NAT rule.

Whi Squid don't forward the traffic with transparent mode checked ?

exa_gon · May 27, 2016, 9:30 AM

No one have any solution ?

I have read a lot of documents, but nothing find to resolve the redirect inside the configuration of transparent proxy.

exa_gon · May 30, 2016, 8:47 AM

I haven't find any solution without add the NAT rules.

Someone can confirm me that is the corrrect way to working with transparent proxy ? ( but I don't understand the check boc "transparent proxy" )

Thanks in advance.