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Transparent proxy server architecture of squid proxy service

2022-07-23 16:21:00 【Full stack programmer webmaster】

Hello everyone , I meet you again , I'm your friend, Quan Jun .

List of articles

1. Server configuration

The server

Host name

IP Address

Main software

Squid The server

squid_server

Extranet ens33：192.168.10.20 | Intranet ens37：10.0.0.100

squid

Web The server

web_server

Intranet 10.0.0.200

apache

Win10 client

Extranet 192.168.10.85

edge browser

2. Squid Server deployment

2.1 modify Squid The configuration file 

[[email protected]_server ~]# vim /etc/squid.conf

# And finally deny all other access to this proxy
http_access allow all
http_access deny all

# Squid normally listens to port 3128
##60 That's ok , modify , Add a network card that provides intranet services IP Address , And support transparent proxy options transparent
http_port 192.168.10.20:3128 transparent
cache_effective_user squid
cache_effective_group squid
cache_mem 64 MB
reply_body_max_size 10 MB
maximum_object_size 4096 KB

[[email protected]_server ~]# systemctl restart squid

2.2 Turn on route forwarding , Realize the address forwarding of different network segments in the machine 

[[email protected]_server ~]#echo 'net.ipv4.ip_forward = 1' >> /etc/sysctl.conf
[[email protected]_server ~]#sysctl -p
net.ipv4.ip_forward = 1

2.3 Modify firewall rules 

[[email protected]_server ~]#iptables -F
[[email protected]_server ~]#iptables -t nat -F
[[email protected]_server ~]#iptables -t nat -I PREROUTING -i ens33 -s 192.168.10.0/24 -p tcp --dport 80 -j REDIRECT --to 3128
# For forwarding  http  agreement , Redirect access port to  3128
[[email protected]_server ~]#iptables -t nat -I PREROUTING -i ens33 -s 192.168.10.0/24 -p tcp --dport 443 -j REDIRECT --to 3128
# For forwarding  https  agreement , Redirect access port to  3128
[[email protected]_server ~]#iptables -I INPUT -p tcp --dport 3128 -j ACCEPT
# Define firewall inbound rules , allow  3128  Connection request for

3. Client access test

client 192.168.10.85 visit web The server 10.0.0.200

  • Close the manual agent
  • The gateway to squid agent ens33 IP

see Squid New record of access log （192.168.10.20）

Refresh the page several times on the client , Check the access 

[[email protected]_server ~]#tail -f /usr/local/squid/var/logs/access.log
1635941728.519  31737 192.168.10.85 TCP_TUNNEL/200 6844 CONNECT cp601.prod.do.dsp.mp.microsoft.com:443 - HIER_DIRECT/184.29.187.90 -
1635941729.950  28933 192.168.10.85 TCP_TUNNEL/200 6842 CONNECT cp601.prod.do.dsp.mp.microsoft.com:443 - HIER_DIRECT/184.29.187.90 -
1635941766.747  69937 192.168.10.85 TCP_TUNNEL/200 6591 CONNECT disc601.prod.do.dsp.mp.microsoft.com:443 - HIER_DIRECT/184.29.187.90 -
1635941822.746 133072 192.168.10.85 TCP_TUNNEL/200 6617 CONNECT geover.prod.do.dsp.mp.microsoft.com:443 - HIER_DIRECT/104.85.33.217 -
1635941886.914   1612 192.168.10.85 TCP_TUNNEL/200 4900 CONNECT v10.events.data.microsoft.com:443 - HIER_DIRECT/20.42.73.25 -
1635941897.422    476 192.168.10.85 TCP_TUNNEL/200 3968 CONNECT settings-win.data.microsoft.com:443 - HIER_DIRECT/40.119.249.228 -
1635941899.775    446 192.168.10.85 TCP_TUNNEL/200 4017 CONNECT settings-win.data.microsoft.com:443 - HIER_DIRECT/40.119.249.228 -
1635941912.755  11406 192.168.10.85 TCP_TUNNEL/200 4901 CONNECT v10.events.data.microsoft.com:443 - HIER_DIRECT/20.42.73.25 -
1635944385.775      0 192.168.10.20 TCP_MISS/403 4076 GET http://www.msftconnecttest.com/connecttest.txt - HIER_NONE/- text/html
1635944385.775     49 192.168.10.85 TCP_MISS/403 4137 GET http://www.msftconnecttest.com/connecttest.txt - ORIGINAL_DST/192.168.10.20 text/html
1635944910.531      3 192.168.10.85 TCP_MISS/403 5244 GET http://10.0.0.200/ - ORIGINAL_DST/10.0.0.200 text/html
1635944910.611      2 192.168.10.85 TCP_MISS/200 5405 GET http://10.0.0.200/noindex/css/open-sans.css - ORIGINAL_DST/10.0.0.200 text/css
1635944910.611      3 192.168.10.85 TCP_MISS/200 19666 GET http://10.0.0.200/noindex/css/bootstrap.min.css - ORIGINAL_DST/10.0.0.200 text/css
1635944910.649      1 192.168.10.85 TCP_MISS/200 4280 GET http://10.0.0.200/images/poweredby.png - ORIGINAL_DST/10.0.0.200 image/png
1635944910.649      1 192.168.10.85 TCP_MISS/200 2650 GET http://10.0.0.200/images/apache_pb.gif - ORIGINAL_DST/10.0.0.200 image/gif
1635944910.729      0 192.168.10.85 TCP_MISS/404 494 GET http://10.0.0.200/noindex/css/fonts/Bold/OpenSans-Bold.woff - ORIGINAL_DST/10.0.0.200 text/html
1635944910.730      0 192.168.10.85 TCP_MISS/404 496 GET http://10.0.0.200/noindex/css/fonts/Light/OpenSans-Light.woff - ORIGINAL_DST/10.0.0.200 text/html
1635944910.854      0 192.168.10.85 TCP_MISS/404 495 GET http://10.0.0.200/noindex/css/fonts/Light/OpenSans-Light.ttf - ORIGINAL_DST/10.0.0.200 text/html
1635944910.854      1 192.168.10.85 TCP_MISS/404 493 GET http://10.0.0.200/noindex/css/fonts/Bold/OpenSans-Bold.ttf - ORIGINAL_DST/10.0.0.200 text/html
1635944910.879      1 192.168.10.85 TCP_MISS/404 464 GET http://10.0.0.200/favicon.ico - ORIGINAL_DST/10.0.0.200 text/html

You can see that the previous visits are slow , Fast in the back , Because the following access directly returns squid Cached data in the server , The response speed of the client has been greatly improved .

see Web New record of access log （10.0.0.200） 

[[email protected]_server ~]#tail -f /var/log/httpd/access_log
10.0.0.100 - - [03/Nov/2021:21:08:33 +0800] "GET / HTTP/1.1" 403 4897 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36 Edg/95.0.1020.40"
10.0.0.100 - - [03/Nov/2021:21:08:33 +0800] "GET /noindex/css/fonts/Light/OpenSans-Light.woff HTTP/1.1" 404 241 "http://10.0.0.200/noindex/css/open-sans.css" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36 Edg/95.0.1020.40"
10.0.0.100 - - [03/Nov/2021:21:08:33 +0800] "GET /noindex/css/fonts/Bold/OpenSans-Bold.woff HTTP/1.1" 404 239 "http://10.0.0.200/noindex/css/open-sans.css" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36 Edg/95.0.1020.40"
10.0.0.100 - - [03/Nov/2021:21:08:33 +0800] "GET /noindex/css/fonts/Bold/OpenSans-Bold.ttf HTTP/1.1" 404 238 "http://10.0.0.200/noindex/css/open-sans.css" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36 Edg/95.0.1020.40"
10.0.0.100 - - [03/Nov/2021:21:08:33 +0800] "GET /noindex/css/fonts/Light/OpenSans-Light.ttf HTTP/1.1" 404 240 "http://10.0.0.200/noindex/css/open-sans.css" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36 Edg/95.0.1020.40"
10.0.0.100 - - [03/Nov/2021:21:08:33 +0800] "GET / HTTP/1.1" 403 4897 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36 Edg/95.0.1020.40"
10.0.0.100 - - [03/Nov/2021:21:08:33 +0800] "GET /noindex/css/fonts/Light/OpenSans-Light.woff HTTP/1.1" 404 241 "http://10.0.0.200/noindex/css/open-sans.css" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36 Edg/95.0.1020.40"
10.0.0.100 - - [03/Nov/2021:21:08:33 +0800] "GET /noindex/css/fonts/Bold/OpenSans-Bold.woff HTTP/1.1" 404 239 "http://10.0.0.200/noindex/css/open-sans.css" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36 Edg/95.0.1020.40"
10.0.0.100 - - [03/Nov/2021:21:08:33 +0800] "GET /noindex/css/fonts/Light/OpenSans-Light.ttf HTTP/1.1" 404 240 "http://10.0.0.200/noindex/css/open-sans.css" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36 Edg/95.0.1020.40"
10.0.0.100 - - [03/Nov/2021:21:08:33 +0800] "GET /noindex/css/fonts/Bold/OpenSans-Bold.ttf HTTP/1.1" 404 238 "http://10.0.0.200/noindex/css/open-sans.css" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36 Edg/95.0.1020.40"

Access records from squid The external network card of the proxy server , The external network port of the proxy server replaces the client in accessing , bring web The server cannot know the truth of the customer IP.

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