RSS

Secure Squid Proxy Server

Install and quick configure squid to make it securely

Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. It reduces bandwidth and improves response times by caching and reusing frequently-requested web pages.

Installation

Install on Mac with brew

$ brew install squid
==> Downloading https://homebrew.bintray.com/bottles/squid-4.10.catalina.bottle.tar.gz
==> Downloading from https://akamai.bintray.com/b3/b317cad793854ed6b0c3933ebec75194383d5c2b47e5f868027aaa9e9decb8f9?__gd
######################################################################## 100.0%
==> Pouring squid-4.10.catalina.bottle.tar.gz
==> Caveats
To have launchd start squid now and restart at login:
  brew services start squid
Or, if you don't want/need a background service you can just run:
  squid
==> Summary
🍺  /usr/local/Cellar/squid/4.10: 2,111 files, 9.8MB

Start the squid:

$ brew services start squid

Configuration

Configure file on Mac:

/usr/local/etc/squid.conf

acl: define source network

Define allowed source by acl:

acl zerotiernet src 10.247.110.0/24

http_access: Allow traffic from specific network source

Use http_access to allow traffic source:

#http_access allow localnet
http_access allow zerotiernet

http_port: Bind to ip:port

Limit the listen port on specific IP by http_port:

Usage: port [mode] [options]
       hostname:port [mode] [options]
       1.2.3.4:port [mode] [options]

The socket addresses where Squid will listen for HTTP client requests. You may specify multiple socket addresses.

There are three forms: port alone, hostname with port, and IP address with port. If you specify a hostname or IP address, Squid binds the socket to that specific address.

Most likely, you do not need to bind to a specific address, so you can use the port number alone.

If you run Squid on a dual-homed machine with an internal and an external interface we recommend you to specify the internal address:port in http_port. This way Squid will only be visible on the internal address.

#http_port 3128
http_port 10.247.110.135:3128  # Only listen on zerotier one network

forwarded_for: X-Forwarded-For header control

X-Forwarded-For header controlled by forwarded_for:

If set to “on”, Squid will append your client’s IP address in the HTTP requests it forwards. By default it looks like:

X-Forwarded-For: 192.1.2.3

If set to “off”, it will appear as

X-Forwarded-For: unknown

If set to “transparent”, Squid will not alter the X-Forwarded-For header in any way.

If set to “delete”, Squid will delete the entire X-Forwarded-For header.

If set to “truncate”, Squid will remove all existing X-Forwarded-For entries, and place the client IP as the sole entry.

# Do not send X-Forwarded-For header
forwarded_for delete

A full recommend squid.conf

$ cat /usr/local/etc/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 zerotiernet src 10.247.110.0/24      # ZeroTier One network

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
#

# 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
http_access allow zerotiernet

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

# Squid normally listens to port 3128
#http_port 3128
http_port 10.247.110.135:3128  # Only listen on zerotier one network


# forwarded_for  X-Forwarded-For
# If set to "on", Squid will append your client's IP address
# in the HTTP requests it forwards. By default it looks like:
#
#   X-Forwarded-For: 192.1.2.3
#
# If set to "off", it will appear as
#
#   X-Forwarded-For: unknown
#
# If set to "transparent", Squid will not alter the
# X-Forwarded-For header in any way.
#
# If set to "delete", Squid will delete the entire
# X-Forwarded-For header.
#
# If set to "truncate", Squid will remove all existing
# X-Forwarded-For entries, and place the client IP as the sole entry.
# default forwarded_for on
#
# Do not send X-Forwarded-For header
forwarded_for delete

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

# Leave coredumps in the first cache dir
coredump_dir /usr/local/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

References

A1Blocker - Hide Apps

Hide Apps from Home Screen, App Library and Lock Apps to protect your privacy even further (requires iOS 16).

DNS Firewall for iOS

Encrypted your DNS to protect your privacy and firewall to block phishing, malicious domains, block ads in all browsers and apps

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