CentOS 8 でwhitelistで特定のドメインだけアクセスさせたい。設定方法を徹底解説

# yum -y install squid

# cp -p /etc/squid/squid.conf /etc/squid/squid.conf.bk

# cat /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 0.0.0.1-0.255.255.255  # RFC 1122 "this" network (LAN)
acl localnet src 10.0.0.0/8             # RFC 1918 local private network (LAN)
acl localnet src 100.64.0.0/10          # RFC 6598 shared address space (CGN)
acl localnet src 169.254.0.0/16         # RFC 3927 link-local (directly plugged) machines
acl localnet src 172.16.0.0/12          # RFC 1918 local private network (LAN)
acl localnet src 192.168.0.0/16         # RFC 1918 local private network (LAN)
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 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 whitelist dstdomain "/etc/squid/whitelist"  #Whitelist 用の設定を追加
http_access allow whitelist                     #Whitelist 用の設定を追加

# 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 whitelist　　　　　　　　　　#コメントアウト
#http_access allow localhost　　　　　　　　　　#コメントアウト

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

# Squid normally listens to port 3128
http_port 8080　　　　　　　　　　　　　　　　　#ポート番号を8080に変更

# Uncomment and adjust the following to add a disk cache directory.
#cache_dir ufs /var/spool/squid 100 16 256

# Leave coredumps in the first cache dir
coredump_dir /var/spool/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

no_cache deny all　　　　　　　　　　　　　　　　　#キャッシュOFF設定

forwarded_for off                                 #プロキシサーバーの匿名性設定関連
request_header_access X-Forwarded-For deny all    #プロキシサーバーの匿名性設定関連
request_header_access Via deny all                #プロキシサーバーの匿名性設定関連
request_header_access Cache-Control deny all      #プロキシサーバーの匿名性設定関連

# vi /etc/squid/whitelist
.yahoo.co.jp
.centos.org

# vi /etc/environment
http_proxy="http://192.168.1.29:8080/"
HTTP_PROXY="http://192.168.1.29:8080/"
https_proxy="https://192.168.1.29:8080/"
HTTPS_PROXY="https://192.168.1.29:8080/"
ftp_proxy="ftp://192.168.1.29:8080/"
FTP_PROXY="ftp://192.168.1.29:8080/"

no_proxy=".example.co.jp,.test.local,server1.example.com,server2.example.com"

# systemctl restart squid.service
# systemctl status squid.service
● squid.service - Squid caching proxy
   Loaded: loaded (/usr/lib/systemd/system/squid.service; enabled; vendor prese>
   Active: active (running) (thawing) since Sun 2022-04-03 15:58:10 JST; 7h ago
     Docs: man:squid(8)
  Process: 2009 ExecReload=/usr/bin/kill -HUP $MAINPID (code=exited, status=0/S>
  Process: 9296 ExecStartPre=/usr/libexec/squid/cache_swap.sh (code=exited, sta>
 Main PID: 9302 (squid)
    Tasks: 3 (limit: 11245)
   Memory: 17.8M
   CGroup: /system.slice/squid.service
           tq9302 /usr/sbin/squid --foreground -f /etc/squid/squid.conf
           tq9306 (squid-1) --kid squid-1 --foreground -f /etc/squid/squid.conf
           mq9307 (logfile-daemon) /var/log/squid/access.log