[squid-users] Setting up a transparent http and https proxy server using squid 4.6

Mon Jan 4 14:26:23 UTC 2021

Just take into account that it will not filter any https/ssl sites this way.
You will need to create an acl to allow only exceptions to be spliced.

Try to look at the ufdbguard manual at:
https://www.urlfilterdb.com/files/downloads/ReferenceManual.pdf

at section: 3.3.2Squid Example Configuration, SSL-Bump peek+splice

All The Bests,
Eliezer

----
Eliezer Croitoru
Tech Support
Mobile: +972-5-28704261
Email: mailto:ngtech1ltd at gmail.com
Zoom: Coming soon

From: jean francois hasson <jfhasson at club-internet.fr> 
Sent: Monday, January 4, 2021 4:19 PM
To: ngtech1ltd at gmail.com
Cc: squid-users at lists.squid-cache.org
Subject: Re: [squid-users] Setting up a transparent http and https proxy server using squid 4.6

Hi,
Doing the change below works. I can now access ebay.fr through the raspberry pi.
Best regards,
JF
Le 04/01/2021 à 13:04, mailto:ngtech1ltd at gmail.com a écrit :
Try as test to remove:
ssl_bump terminate all

Ie use only the next bump rules:
### START
# TLS/SSL bumping definitions
acl tls_s1_connect at_step SslBump1
acl tls_s2_client_hello at_step SslBump2
acl tls_s3_server_hello at_step SslBump3

ssl_bump peek tls_s1_connect
ssl_bump splice all
### END
The above is from an example at ufdbguard manual.

Let me know if you are still having issues in full splice mode.

Eliezer

----
Eliezer Croitoru
Tech Support
Mobile: +972-5-28704261
Email: mailto:ngtech1ltd at gmail.com
Zoom: Coming soon

From: jean francois hasson mailto:jfhasson at club-internet.fr 
Sent: Monday, January 4, 2021 8:51 AM
To: mailto:ngtech1ltd at gmail.com
Cc: mailto:squid-users at lists.squid-cache.org
Subject: Re: [squid-users] Setting up a transparent http and https proxy server using squid 4.6

Hi,
Thank you for looking at my question.
I dowloaded the squid 4.6 source code from http://ftp.debian.org/debian/pool/main/s/squid/ and selected squid_4.6.orig.tar.gz, squid_4.6-1+deb10u4.debian.tar.xz and squid_4.6-1+deb10u4.dsc. I modified the debian/rules file by adding to DEB_CONFIGURE_EXTRA_FLAGS the following --with-openssl, --enable-ssl and --enable-ssl-crtd.
The squid -v output is :
Squid Cache: Version 4.6
Service Name: squid
Raspbian linux

This binary uses OpenSSL 1.0.2q  20 Nov 2018. For legal restrictions on distribution see https://www.openssl.org/source/license.html

configure options:  '--build=arm-linux-gnueabihf' '--prefix=/usr' '--includedir=${prefix}/include' '--mandir=${prefix}/share/man' '--infodir=${prefix}/share/info' '--sysconfdir=/etc' '--localstatedir=/var' '--libexecdir=${prefix}/lib/squid' '--srcdir=.' '--disable-maintainer-mode' '--disable-dependency-tracking' '--disable-silent-rules' 'BUILDCXXFLAGS=-g -O2 -fdebug-prefix-map=/home/pi/build/squid/squid-4.6=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -Wl,-z,relro -Wl,-z,now -Wl,--as-needed -latomic' 'BUILDCXX=arm-linux-gnueabihf-g++' '--with-build-environment=default' '--enable-build-info=Raspbian linux' '--datadir=/usr/share/squid' '--sysconfdir=/etc/squid' '--libexecdir=/usr/lib/squid' '--mandir=/usr/share/man' '--enable-inline' '--disable-arch-native' '--enable-async-io=8' '--enable-storeio=ufs,aufs,diskd,rock' '--enable-removal-policies=lru,heap' '--enable-delay-pools' '--enable-cache-digests' '--enable-icap-client' '--enable-follow-x-forwarded-for' '--enable-auth-basic=DB,fake,getpwnam,LDAP,NCSA,NIS,PAM,POP3,RADIUS,SASL,SMB' '--enable-auth-digest=file,LDAP' '--enable-auth-negotiate=kerberos,wrapper' '--enable-auth-ntlm=fake,SMB_LM' '--enable-external-acl-helpers=file_userip,kerberos_ldap_group,LDAP_group,session,SQL_session,time_quota,unix_group,wbinfo_group' '--enable-security-cert-validators=fake' '--enable-storeid-rewrite-helpers=file' '--enable-url-rewrite-helpers=fake' '--enable-eui' '--enable-esi' '--enable-icmp' '--enable-zph-qos' '--enable-ecap' '--disable-translation' '--with-swapdir=/var/spool/squid' '--with-logdir=/var/log/squid' '--with-pidfile=/var/run/squid.pid' '--with-filedescriptors=65536' '--with-large-files' '--with-default-user=proxy' '--with-gnutls' '--with-openssl' '--enable-ssl' '--enable-ssl-crtd' '--enable-linux-netfilter' 'build_alias=arm-linux-gnueabihf' 'CC=arm-linux-gnueabihf-gcc' 'CFLAGS=-g -O2 -fdebug-prefix-map=/home/pi/build/squid/squid-4.6=. -fstack-protector-strong -Wformat -Werror=format-security -Wall' 'LDFLAGS=-Wl,-z,relro -Wl,-z,now -Wl,--as-needed -latomic' 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2' 'CXX=arm-linux-gnueabihf-g++' 'CXXFLAGS=-g -O2 -fdebug-prefix-map=/home/pi/build/squid/squid-4.6=. -fstack-protector-strong -Wformat -Werror=format-security'
When I run openssl version I get 1.1.1d.
I hope it helps.
Best regards,
JF
Le 03/01/2021 à 21:55, mailto:ngtech1ltd at gmail.com a écrit :
Hey,

I am missing a bit of the context, like:
Did you self compiled squid? Is it from the OS repository?
Squid -v might help a bit to understand what you do have enabled in your Squid.

Eliezer

----
Eliezer Croitoru
Tech Support
Mobile: +972-5-28704261
Email: mailto:ngtech1ltd at gmail.com
Zoom: Coming soon

From: squid-users mailto:squid-users-bounces at lists.squid-cache.org On Behalf Of jean francois hasson
Sent: Thursday, December 31, 2020 11:10 AM
To: mailto:squid-users at lists.squid-cache.org
Subject: [squid-users] Setting up a transparent http and https proxy server using squid 4.6

Hi,
I am trying to create for my home network a transparent proxy to implement filtering rules based on website names mainly.
I have been looking at using a Raspberry pi 3B+ running pi OS. I configured it to be a Wifi access point using RaspAP quick install. The Wifi network on which the filtering option is to be implemented is with IP 10.3.141.xxx. The router is at address 10.3.141.1.
I have the following squid.conf file which I tried to create based on different mails, websites and blogs I read :
acl SSL_ports port 443 #https
acl SSL_ports port 563 # snews
acl SSL_ports port 873 # rsync
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

#Le réseau local
acl LocalNet src 10.3.141.0/24

acl bump_step1 at_step SslBump1
acl bump_step2 at_step SslBump2
acl bump_step3 at_step SslBump3

#Définition des autorisations
http_access deny !Safe_ports
#http_access deny CONNECT !SSL_ports
http_access allow localhost manager
http_access deny manager
http_access allow localhost
http_access allow LocalNet
http_access deny all

#Définition des ports d'écoute
http_port 8080
http_port 3128 intercept
https_port 3129 intercept ssl-bump \
  tls-cert=/etc/squid/cert/example.crt \
  tls-key=/etc/squid/cert/example.key \
  generate-host-certificates=on  dynamic_cert_mem_cache_size=4MB

sslcrtd_program /usr/lib/squid/security_file_certgen -s /var/lib/ssl_db -M 4MB
sslcrtd_children 5

ssl_bump peek all
acl tls_whitelist ssl::server_name .example.com
ssl_bump splice tls_whitelist
ssl_bump terminate all

coredump_dir /var/spool/squid

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

cache_dir ufs /cache 400 16 256
cache_access_log /var/log/squid/access.log
cache_effective_user proxy
If I set up on a device connected to the access point a proxy manually ie 10.3.141.1 on port 8080, I can access the internet. If I put the following rules for iptables to use in files rules.v4 :
*nat
-A PREROUTING -i eth0 -p tcp -m tcp --dport 80 -j DNAT --to-destination 10.3.141.1:3128
-A PREROUTING -i eth0 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 3128
-A PREROUTING -i eth0 -p tcp -m tcp --dport 443 -j DNAT --to-destination 10.3.141.1:3129
-A PREROUTING -i eth0 -p tcp -m tcp --dport 443 -j REDIRECT --to-ports 3129
-A POSTROUTING -s 10.3.141.0/24 -o eth0 -j MASQUERADE
COMMIT
Now, if I remove the manual proxy configuration of the device connected to the access point, I can't connect to the internet. If I leave the manual proxy configuration it does work and there is activity logged in /var/log/squid/access.log.
Please let me know what might be wrong in my configuration if possible.
Best regards,
JF