[squid-users] allow update domain and block everything else
Miroslaw Malinowski
mr.miroslaw.malinowski at gmail.com
Thu Apr 15 12:03:46 UTC 2021
Hi,
I'm trying to use Opnsense built-in squid config to set up a transparent
proxy for server updates and block everything else.
In GUI they use url_regex for whitelist and blacklist, when I simple per
domain whitelist and blacklist it's working as expected, e.g.
# ACL - Whitelist - User defined (whiteList)
acl whiteList url_regex archive\.ubuntu\.com
# ACL - Blacklist - User defined (blackList)
acl blackList url_regex packages\.gitlab\.com
# ACL list (Allow) whitelist
http_access allow whiteList
# ACL list (Deny) blacklist
http_access deny blackList
However, when I do wildcard in blacklist I also get all https domain
blocked even when I've tried to explicitly allow it with
https://archive\.ubuntu\.com
, e.g.
# ACL - Whitelist - User defined (whiteList)
acl whiteList url_regex archive\.ubuntu\.com
# ACL - Blacklist - User defined (blackList)
acl blackList url_regex .*
# ACL list (Allow) whitelist
http_access allow whiteList
# ACL list (Deny) blacklist
http_access deny blackList
I get:
Err:7 https://repos.influxdata.com/ubuntu focal InRelease
403 Forbidden [IP: 52.84.95.46 443]
What I'm trying to say is with blacklist as . is blocking all https traffic
even if whitelisted, is this an expected behaviour or I'm doing something
wrong or it can't be done with url_regex and I should do it at backend
manually.
My config:
#
# Automatic generated configuration for Squid.
# Do not edit this file manually.
#
# Setup transparent mode listeners on loopback interfaces
http_port 127.0.0.1:3128 intercept ssl-bump cert=/var/squid/ssl/ca.pem
dynamic_cert_mem_cache_size=10MB generate-host-certificates=on
http_port [::1]:3128 intercept ssl-bump cert=/var/squid/ssl/ca.pem
dynamic_cert_mem_cache_size=10MB generate-host-certificates=on
https_port 127.0.0.1:3129 intercept ssl-bump cert=/var/squid/ssl/ca.pem
dynamic_cert_mem_cache_size=10MB generate-host-certificates=on
https_port [::1]:3129 intercept ssl-bump cert=/var/squid/ssl/ca.pem
dynamic_cert_mem_cache_size=10MB generate-host-certificates=on
# Setup regular listeners configuration
http_port 172.16.230.252:3128 ssl-bump cert=/var/squid/ssl/ca.pem
dynamic_cert_mem_cache_size=10MB generate-host-certificates=on
http_port 172.16.230.254:3128 ssl-bump cert=/var/squid/ssl/ca.pem
dynamic_cert_mem_cache_size=10MB generate-host-certificates=on
# setup ssl re-cert
sslcrtd_program /usr/local/libexec/squid/security_file_certgen -s
/var/squid/ssl_crtd -M 10MB
sslcrtd_children 5
tls_outgoing_options options=NO_TLSv1
cipher=HIGH:MEDIUM:!RC4:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS
# setup ssl bump acl's
acl bump_step1 at_step SslBump1
acl bump_step2 at_step SslBump2
acl bump_step3 at_step SslBump3
acl bump_nobumpsites ssl::server_name
"/usr/local/etc/squid/nobumpsites.acl"
# configure bump
ssl_bump peek bump_step1 all
ssl_bump peek bump_step2 bump_nobumpsites
ssl_bump splice bump_step3 bump_nobumpsites
ssl_bump stare bump_step2
ssl_bump bump bump_step3
sslproxy_cert_error deny all
acl ftp proto FTP
http_access allow ftp
# Setup ftp proxy
# Rules allowing access from your local networks.
# Generated list of (internal) IP networks from where browsing
# should be allowed. (Allow interface subnets).
acl localnet src <net>/24 # Possible internal network (interfaces v4)
# Default allow for local-link and private networks
acl localnet src fc00::/7 # RFC 4193 local private network range
acl localnet src fe80::/10 # RFC 4291 link-local (directly plugged)
machines
# ACL - Allow localhost for PURGE cache if enabled
acl PURGE method PURGE
http_access allow localhost PURGE
http_access deny PURGE
# ACL lists
# ACL - Whitelist - User defined (whiteList)
acl whiteList url_regex packages\.wazuh\.com
acl whiteList url_regex archive\.ubuntu\.com
acl whiteList url_regex security\.ubuntu\.com
acl whiteList url_regex repos\.influxdata\.com
# ACL - Blacklist - User defined (blackList)
acl blackList url_regex .*
# ACL - Remote fetched Blacklist (remoteblacklist)
# ACL - Block browser/user-agent - User defined (browser)
# ACL - SSL ports, default are configured in config.xml
# Configured SSL ports (if defaults are not listed, then they have been
removed from the configuration!):
acl SSL_ports port 443 # https
# Default Safe ports are now defined in config.xml
# Configured Safe ports (if defaults are not listed, then they have been
removed from the configuration!):
# ACL - Safe_ports
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
# ICAP SETTINGS
# disable icap
icap_enable off
# Pre-auth plugins
include /usr/local/etc/squid/pre-auth/*.conf
# Authentication Settings
# ACL list (Allow) whitelist
http_access allow whiteList
#
# ACL list (Deny) blacklist
http_access deny blackList
# Google Suite Filter
# YouTube Filter
# 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
# Auth plugins
include /usr/local/etc/squid/auth/*.conf
#
# Access Permission configuration:
#
# Deny request from unauthorized clients
#
# ACL - localnet - default these include ranges from selected interfaces
(Allow local subnets)
http_access allow localnet
# ACL - localhost
http_access allow localhost
# Deny all other access to this proxy
http_access deny all
# Post-auth plugins
include /usr/local/etc/squid/post-auth/*.conf
# Caching settings
cache_mem 1000 MB
maximum_object_size 200 MB
cache_replacement_policy heap LFUDA
cache_dir ufs /var/squid/cache 100000 16 256
# Leave coredumps in the first cache dir
coredump_dir /var/squid/cache
#
# Add any of your own refresh_pattern entries above these.
#
# Linux package cache:
refresh_pattern pkg\.tar\.xz$ 0 20% 4320 refresh-ims
refresh_pattern d?rpm$ 0 20% 4320 refresh-ims
refresh_pattern deb$ 0 20% 4320 refresh-ims
refresh_pattern udeb$ 0 20% 4320 refresh-ims
refresh_pattern Packages\.bz2$ 0 20% 4320 refresh-ims
refresh_pattern Sources\.bz2$ 0 20% 4320 refresh-ims
refresh_pattern Release\.gpg$ 0 20% 4320 refresh-ims
refresh_pattern Release$ 0 20% 4320 refresh-ims
# http://wiki.squid-cache.org/SquidFaq/WindowsUpdate
refresh_pattern -i
microsoft.com/.*\.(cab|exe|ms[i|u|f]|[ap]sf|wm[v|a]|dat|zip|esd) 4320
80% 129600 reload-into-ims
refresh_pattern -i
windowsupdate.com/.*\.(cab|exe|ms[i|u|f]|[ap]sf|wm[v|a]|dat|zip|esd) 4320
80% 129600 reload-into-ims
refresh_pattern -i
windows.com/.*\.(cab|exe|ms[i|u|f]|[ap]sf|wm[v|a]|dat|zip|esd) 4320
80% 129600 reload-into-ims
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
# Squid Options
# dns_v4_first reverses the order of preference to make Squid contact
dual-stack websites over IPv4 first
dns_v4_first on
pinger_enable off
access_log stdio:/var/log/squid/access.log squid
cache_store_log stdio:/var/log/squid/store.log
# URI hanlding with Whitespaces (default=strip)
uri_whitespace strip
# X-Forwarded header handling (default=on)
forwarded_for on
# Disable squid logfile rotate to use system defaults
logfile_rotate 0
# Define visible email
cache_mgr admin at localhost.local
error_directory /usr/local/etc/squid/errors/local
Thanks
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