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if (empty($settings['sslproxy_compatibility_mode']) || ($settings['sslproxy_compatibility_mode'] == 'modern')) {
// Modern cipher suites
$sslproxy_cipher = "EECDH+ECDSA+AESGCM:EECDH+aRSA+AESGCM:EECDH+ECDSA+SHA384:EECDH+ECDSA+SHA256:EECDH+aRSA+SHA384:EECDH+aRSA+SHA256:EECDH+aRSA+RC4:EECDH:EDH+aRSA:!RC4:!aNULL:!eNULL:!LOW:!3DES:!SHA1:!MD5:!EXP:!PSK:!SRP:!DSS";
$sslproxy_options .= ",NO_TLSv1";
} else {
$sslproxy_cipher = "EECDH+ECDSA+AESGCM:EECDH+aRSA+AESGCM:EECDH+ECDSA+SHA384:EECDH+ECDSA+SHA256:EECDH+aRSA+SHA384:EECDH+aRSA+SHA256:EECDH+aRSA+RC4:EECDH:EDH+aRSA:HIGH:!RC4:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS";
}

Should the RC4  be removed or allowed?




On Apr 4, 2024, at 18:17, Amos Jeffries <squid3@xxxxxxxxxxxxx> wrote:

On 4/04/24 17:48, Jonathan Lee wrote:
Is there any particular order to squid configuration??

Yes. <https://wiki.squid-cache.org/SquidFaq/OrderIsImportant>


Does this look correct?

Best way to find out is to run "squid -k parse", which should be done after upgrades as well to identify and fix changes between versions as we improve the output.


I actually get allot of hits and it functions amazing, so I wanted to share this in case I could improve something. Is there any issues with security?

Yes, the obvious one is "DONT_VERIFY_PEER" disabling TLS security entirely on outbound connections. That particular option will prevent you even being told about suspicious activity regarding TLS.

Also there are a few weird things in your TLS cipher settings, such as this sequence "  EECDH+aRSA+RC4:...:!RC4 "
Which as I understand, enables the EECDH with RC4 hash, but also forbids all uses of RC4.


I am concerned that an invasive container could become installed in the cache and data marshal the network card.

You have a limit of 4 MB for objects allowed to pass through this proxy, exception being objects from domains listed in the "windowsupdate" ACL (not all Windows related) which are allowed up to 512 MB.

For the general case, any type of file which can store an image of some system is a risk for that type of vulnerability can be cached.

The place to fix that vulnerability properly is not the cache or Squid. It is the OS permissions allowing non-Squid software access to the cache files and/or directory.



Here is my config
# This file is automatically generated by pfSense
# Do not edit manually !

Since this file is generated by pfsense there is little that can be done about ordering issues and very hard to tell which of the problems below are due to pfsense and which due toy your settings.

FWIW, there are no major issues, just some lines not being necessary due to setting things to their default values, or just some blocks already denyign things that are blocked previously.


http_port 192.168.1.1:3128 ssl-bump generate-host-certificates=on dynamic_cert_mem_cache_size=20MB cert=/usr/local/etc/squid/serverkey.pem cafile=/usr/local/share/certs/ca-root-nss.crt capath=/usr/local/share/certs/ cipher=EECDH+ECDSA+AESGCM:EECDH+aRSA+AESGCM:EECDH+ECDSA+SHA384:EECDH+ECDSA+SHA256:EECDH+aRSA+SHA384:EECDH+aRSA+SHA256:EECDH+aRSA+RC4:EECDH:EDH+aRSA:HIGH:!RC4:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS tls-dh=prime256v1:/etc/dh-parameters.2048 options=NO_SSLv3,SINGLE_DH_USE,SINGLE_ECDH_USE
http_port 127.0.0.1:3128 intercept ssl-bump generate-host-certificates=on dynamic_cert_mem_cache_size=20MB cert=/usr/local/etc/squid/serverkey.pem cafile=/usr/local/share/certs/ca-root-nss.crt capath=/usr/local/share/certs/ cipher=EECDH+ECDSA+AESGCM:EECDH+aRSA+AESGCM:EECDH+ECDSA+SHA384:EECDH+ECDSA+SHA256:EECDH+aRSA+SHA384:EECDH+aRSA+SHA256:EECDH+aRSA+RC4:EECDH:EDH+aRSA:HIGH:!RC4:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS tls-dh=prime256v1:/etc/dh-parameters.2048 options=NO_SSLv3,SINGLE_DH_USE,SINGLE_ECDH_USE
https_port 127.0.0.1:3129 intercept ssl-bump generate-host-certificates=on dynamic_cert_mem_cache_size=20MB cert=/usr/local/etc/squid/serverkey.pem cafile=/usr/local/share/certs/ca-root-nss.crt capath=/usr/local/share/certs/ cipher=EECDH+ECDSA+AESGCM:EECDH+aRSA+AESGCM:EECDH+ECDSA+SHA384:EECDH+ECDSA+SHA256:EECDH+aRSA+SHA384:EECDH+aRSA+SHA256:EECDH+aRSA+RC4:EECDH:EDH+aRSA:HIGH:!RC4:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS tls-dh=prime256v1:/etc/dh-parameters.2048 options=NO_SSLv3,SINGLE_DH_USE,SINGLE_ECDH_USE
icp_port 0
digest_generation off
dns_v4_first on
pid_filename /var/run/squid/squid.pid
cache_effective_user squid
cache_effective_group proxy
error_default_language en
icon_directory /usr/local/etc/squid/icons
visible_hostname ****
cache_mgr ****
access_log /var/squid/logs/access.log
cache_log /var/squid/logs/cache.log
cache_store_log none
netdb_filename /var/squid/logs/netdb.state
pinger_enable on
pinger_program /usr/local/libexec/squid/pinger
sslcrtd_program /usr/local/libexec/squid/security_file_certgen -s /var/squid/lib/ssl_db -M 4MB -b 2048
tls_outgoing_options cafile=/usr/local/share/certs/ca-root-nss.crt
tls_outgoing_options capath=/usr/local/share/certs/
tls_outgoing_options options=NO_SSLv3,SINGLE_DH_USE,SINGLE_ECDH_USE
tls_outgoing_options cipher=EECDH+ECDSA+AESGCM:EECDH+aRSA+AESGCM:EECDH+ECDSA+SHA384:EECDH+ECDSA+SHA256:EECDH+aRSA+SHA384:EECDH+aRSA+SHA256:EECDH+aRSA+RC4:EECDH:EDH+aRSA:HIGH:!RC4:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS
tls_outgoing_options flags=DONT_VERIFY_PEER
sslcrtd_children 10
logfile_rotate 0
debug_options rotate=0
shutdown_lifetime 3 seconds
# Allow local network(s) on interface(s)
acl localnet src  192.168.1.0/27
forwarded_for transparent
httpd_suppress_version_string on
uri_whitespace strip
acl getmethod method GET
acl windowsupdate dstdomain windowsupdate.microsoft.com
acl windowsupdate dstdomain .update.microsoft.com
acl windowsupdate dstdomain download.windowsupdate.com
acl windowsupdate dstdomain redir.metaservices.microsoft.com
acl windowsupdate dstdomain images.metaservices.microsoft.com
acl windowsupdate dstdomain c.microsoft.com
acl windowsupdate dstdomain www.download.windowsupdate.com
acl windowsupdate dstdomain wustat.windows.com
acl windowsupdate dstdomain crl.microsoft.com
acl windowsupdate dstdomain sls.microsoft.com
acl windowsupdate dstdomain productactivation.one.microsoft.com
acl windowsupdate dstdomain ntservicepack.microsoft.com
acl windowsupdate dstdomain dc1-st.ksn.kaspersky-labs.com
acl windowsupdate dstdomain dc1-file.ksn.kaspersky-labs.com
acl windowsupdate dstdomain dc1.ksn.kaspersky-labs.com
acl rewritedoms dstdomain .facebook.com .akamaihd.net .fbcdn.net .google.com .static.com .apple.com .oracle.com .sun.com .java.com .adobe.com .steamstatic.com.steampowered.com .steamcontent.com .google.com
store_id_program /usr/local/libexec/squid/storeid_file_rewrite /var/squid/storeid/storeid_rewrite.txt
store_id_children 10 startup=5 idle=1 concurrency=0
always_direct allow !getmethod
store_id_access deny connect
store_id_access deny !getmethod
store_id_access allow rewritedoms
reload_into_ims on
max_stale 20 years
minimum_expiry_time 0


I am not sure how many of these refresh_pattern rules below are written by you, copy-pasted from elsewhere, or added automatically by pfsense. So how you need to fix the problems here is uncertain.

That said, please consider removing all these override-* and ignore-*.
<http://www.squid-cache.org/Doc/config/refresh_pattern/>


refresh_pattern -i squid.internal 10080 80% 79900 override-lastmod override-expire ignore-reload ignore-no-store ignore-must-revalidate ignore-private ignore-auth
#APPLE STUFF
refresh_pattern -i apple.com/..(cab|exe|msi|msu|msf|asf|wmv|wma|dat|zip|dist)$ 0 80% 43200  refresh-ims
#apple update
refresh_pattern -i (download|adcdownload).apple.com/.*.(pkg|dmg) 4320 100% 43200
refresh_pattern -i appldnld.apple.com 129600 100% 129600
refresh_pattern -i phobos.apple.com 129600 100% 129600
refresh_pattern -i iosapps.itunes.apple.com 129600 100% 129600
# Updates: Windows
refresh_pattern -i microsoft.com/..(cab|exe|msi|msu|msf|asf|wma|dat|zip)$ 4320 80% 43200  refresh-ims
refresh_pattern -i windowsupdate.com/..(cab|exe|msi|msu|msf|asf|wma|wmv)|dat|zip)$ 4320 80% 43200  refresh-ims
refresh_pattern -i windows.com/..(cab|exe|msi|msu|msf|asf|wmv|wma|dat|zip)$ 4320 80% 43200  refresh-ims
refresh_pattern -i microsoft.com/.*.(cab|exe|ms[i|u|f]|[ap]sf|wm[v|a]|dat|zip) 4320 80% 43200
refresh_pattern -i windowsupdate.com/.*.(cab|exe|ms[i|u|f]|[ap]sf|wm[v|a]|dat|zip) 4320 80% 43200
refresh_pattern -i windows.com/.*.(cab|exe|ms[i|u|f]|[ap]sf|wm[v|a]|dat|zip) 4320 80% 43200
refresh_pattern -i .*windowsupdate.com/.*.(cab|exe) 259200 100% 259200
refresh_pattern -i .*update.microsoft.com/.*.(cab|exe|dll|msi|psf) 259200 100% 259200
refresh_pattern windowsupdate.com/.*.(cab|exe|dll|msi|psf) 10080 100% 43200
refresh_pattern download.microsoft.com/.*.(cab|exe|dll|msi|psf) 10080 100% 43200
refresh_pattern www.microsoft.com/.*.(cab|exe|dll|msi|psf) 10080 100% 43200
refresh_pattern au.download.windowsupdate.com/.*.(cab|exe|dll|msi|psf) 4320 100% 43200
refresh_pattern bg.v4.pr.dl.ws.microsoft.com/.*.(cab|exe|dll|msi|psf) 4320 100% 43200
#windows update NEW UPDATE 0.04
refresh_pattern update.microsoft.com/.*.(cab|exe) 43200 100% 129600
refresh_pattern ([^.]+.)?(download|(windows)?update).(microsoft.)?com/.*.(cab|exe|msi|msp|psf) 4320 100% 43200
refresh_pattern update.microsoft.com/.*.(cab|exe|dll|msi|psf) 10080 100% 43200
refresh_pattern -i .update.microsoft.com/.*.(cab|exe|ms[i|u|f]|[ap]sf|wm[v|a]|dat|zip) 525600 100% 525600
refresh_pattern -i .windowsupdate.com/.*.(cab|exe|ms[i|u|f]|[ap]sf|wm[v|a]|dat|zip) 525600 100% 525600
refresh_pattern -i .download.microsoft.com/.*.(cab|exe|ms[i|u|f]|[ap]sf|wm[v|a]|dat|zip) 525600 100% 525600
refresh_pattern -i .ws.microsoft.com/.*.(cab|exe|ms[i|u|f]|[ap]sf|wm[v|a]|dat|zip) 525600 100% 525600
refresh_pattern ([^.]+.)?(cs|content[1-9]|hsar|content-origin|client-download).[steampowered|steamcontent].com/.*.* 43200 100% 43200 reload-into-ims ignore-reload ignore-no-store override-expire override-lastmod
refresh_pattern ([^.]+.)?.akamai.steamstatic.com/.*.* 43200 100% 43200 reload-into-ims ignore-reload ignore-no-store override-expire override-lastmod
refresh_pattern -i ([^.]+.)?.adobe.com/.*.(zip|exe) 43200 100% 43200 reload-into-ims ignore-reload ignore-no-store override-expire override-lastmod
refresh_pattern -i ([^.]+.)?.java.com/.*.(zip|exe) 43200 100% 43200 reload-into-ims ignore-reload ignore-no-store override-expire override-lastmod
refresh_pattern -i ([^.]+.)?.sun.com/.*.(zip|exe) 43200 100% 43200 reload-into-ims ignore-reload ignore-no-store override-expire override-lastmod
refresh_pattern -i ([^.]+.)?.oracle.com/.*.(zip|exe|tar.gz) 43200 100% 43200 reload-into-ims ignore-reload ignore-no-store override-expire override-lastmod
refresh_pattern -i appldnld.apple.com 43200 100% 43200 ignore-reload ignore-no-store override-expire override-lastmod
refresh_pattern -i ([^.]+.)?apple.com/.*.(ipa) 43200 100% 43200 ignore-reload ignore-no-store override-expire override-lastmod
 refresh_pattern -i ([^.]+.)?.google.com/.*.(exe|crx) 10080 80% 43200 override-expire override-lastmod ignore-no-cache ignore-reload reload-into-ims ignore-private
refresh_pattern -i ([^.]+.)?g.static.com/.*.(exe|crx) 10080 80% 43200 override-expire override-lastmod ignore-no-cache ignore-reload reload-into-ims ignore-private
#FACEBOOK
refresh_pattern ^http?://*.facebook.com/*  10080 80% 43200 override-expire override-lastmod ignore-no-cache ignore-reload reload-into-ims ignore-private
#FACEBOOK IMAGES
refresh_pattern -i pixel.facebook.com..(jpg|png|gif|ico|css|js)  10080 80% 43200 override-expire override-lastmod ignore-no-cache ignore-reload reload-into-ims ignore-private
refresh_pattern -i .akamaihd.net..(jpg|png|gif|ico|css|js) 10080 80% 43200 override-expire override-lastmod ignore-no-cache ignore-reload reload-into-ims ignore-private
refresh_pattern -i (facebook.com).(jpg|png|gif) 10080 80% 43200 store-stale override-expire override-lastmod ignore-no-cache ignore-reload reload-into-ims ignore-private
refresh_pattern static.(xx|ak).fbcdn.net.(jpg|gif|png) 10080 80% 43200 override-expire override-lastmod ignore-no-cache ignore-reload reload-into-ims ignore-private
refresh_pattern ^https?://profile.ak.fbcdn.net*.(jpg|gif|png) 10080 80% 43200 override-expire override-lastmod ignore-no-cache ignore-reload reload-into-ims ignore-private
#FACEBOOK VIDEO
refresh_pattern -i .video.ak.fbcdn.net.*.(mp4|flv|mp3|amf) 10080 80% 43200 override-expire override-lastmod ignore-no-cache ignore-reload reload-into-ims ignore-private
refresh_pattern (audio|video)/(webm|mp4) 10080 80% 43200 override-expire override-lastmod ignore-no-cache ignore-reload reload-into-ims ignore-private
range_offset_limit 512 MB windowsupdate
maximum_object_size 512 MB windowsupdate
range_offset_limit 0
quick_abort_min -1 KB
cache_mem 64 MB
maximum_object_size_in_memory 256 KB
memory_replacement_policy heap LFUDA
cache_replacement_policy heap LFUDA
minimum_object_size 0 KB
maximum_object_size 4 MB
cache_dir diskd /var/squid/cache 64000 256 256
offline_mode off
cache_swap_low 90
cache_swap_high 95
acl donotcache dstdomain '/var/squid/acl/donotcache.acl'
cache deny donotcache
cache allow all
# 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
#Remote proxies
# Setup some default acls
# ACLs all, manager, localhost, and to_localhost are predefined.
acl allsrc src all
acl safeports port 21 70 80 210 280 443 488 563 591 631 777 901 8080 3128 3129 1025-65535
acl sslports port 443 563 8080 5223 2197
acl purge method PURGE
acl connect method CONNECT
# Define protocols used for redirects
acl HTTP proto HTTP
acl HTTPS proto HTTPS
# SslBump Peek and Splice
# http://wiki.squid-cache.org/Features/SslPeekAndSplice
# http://wiki.squid-cache.org/ConfigExamples/Intercept/SslBumpExplicit
# Match against the current step during ssl_bump evaluation [fast]
# Never matches and should not be used outside the ssl_bump context.
#
# At each SslBump step, Squid evaluates ssl_bump directives to find
# the next bumping action (e.g., peek or splice). Valid SslBump step
# values and the corresponding ssl_bump evaluation moments are:
#   SslBump1: After getting TCP-level and HTTP CONNECT info.
#   SslBump2: After getting TLS Client Hello info.
#   SslBump3: After getting TLS Server Hello info.
# These ACLs exist even when 'SSL/MITM Mode' is set to 'Custom' so that
# they can be used there for custom configuration.
acl step1 at_step SslBump1
acl step2 at_step SslBump2
acl step3 at_step SslBump3
acl banned_hosts src '/var/squid/acl/banned_hosts.acl'
acl whitelist dstdom_regex -i '/var/squid/acl/whitelist.acl'
acl blacklist dstdom_regex -i '/var/squid/acl/blacklist.acl'
http_access allow manager localhost
# Allow external cache managers
acl ext_manager src 192.168.1.1
acl ext_manager src 127.0.0.1
http_access allow manager ext_manager
http_access deny manager
http_access allow purge localhost
http_access deny purge
http_access deny !safeports
http_access deny CONNECT !sslports
# Always allow localhost connections
http_access allow localhost
quick_abort_min 0 KB
quick_abort_max 0 KB
quick_abort_pct 95
request_body_max_size 0 KB
delay_pools 1
delay_class 1 2
delay_parameters 1 -1/-1 -1/-1
delay_initial_bucket_level 100
delay_access 1 allow allsrc
# Reverse Proxy settings
deny_info TCP_RESET allsrc
# Package Integration
url_rewrite_program /usr/local/bin/squidGuard -c /usr/local/etc/squidGuard/squidGuard.conf
url_rewrite_bypass off
url_rewrite_children 32 startup=8 idle=4 concurrency=0

Squidguard is very outdated. You should upgrade to its successor ufdbguard if possible.



# Custom options before auth
#host_verify_strict on
# These hosts are banned
http_access deny banned_hosts
# Always allow access to whitelist domains
http_access allow whitelist
# Block access to blacklist domains
http_access deny blacklist
# List of domains allowed to logging in to Google services
request_header_access X-GoogApps-Allowed-Domains deny all
request_header_add X-GoogApps-Allowed-Domains consumer_accounts
# Set YouTube safesearch restriction
acl youtubedst dstdomain -n www.youtube.com m.youtube.com youtubei.googleapis.com youtube.googleapis.com www.youtube-nocookie.com
request_header_access YouTube-Restrict deny all
request_header_add YouTube-Restrict none youtubedst
acl sglog url_regex -i sgr=ACCESSDENIED
http_access deny sglog
# Custom SSL/MITM options before auth
acl manager proto cache_object
acl localhost src 192.168.1.1/32
#cachemgr_passwd disable offline_toggle reconfigure shutdown
#cachemgr_passwd secret all
acl https_login url_regex -i ^https.*(login|Login).*
acl no_miss url_regex -i ^.*gateway.facebook.com/ws/realtime?
acl no_miss url_regex -i ^.*web-chat-e2ee.facebook.com/ws/chat
acl CONNECT method CONNECT
acl wuCONNECT dstdomain www.update.microsoft.com
acl wuCONNECT dstdomain sls.microsoft.com
http_access allow CONNECT wuCONNECT localnet
http_access allow CONNECT wuCONNECT localhost
http_access allow windowsupdate localnet
http_access allow windowsupdate localhost
http_access deny manager
acl BrokenButTrustedServers dstdomain '/usr/local/pkg/dstdom.broken'
acl DomainMismatch ssl_error SQUID_X509_V_ERR_DOMAIN_MISMATCH
sslproxy_cert_error allow BrokenButTrustedServers DomainMismatch
sslproxy_cert_error deny all
acl splice_only src 192.168.1.8 #Tasha iPhone
acl splice_only src 192.168.1.10 #Jon iPhone
acl splice_only src 192.168.1.11 #Amazon Fire
acl splice_only src 192.168.1.15 #Tasha HP
acl splice_only src 192.168.1.16 #iPad
acl NoSSLIntercept ssl::server_name_regex -i '/usr/local/pkg/url.nobump'
acl markBumped annotate_client bumped=true
acl bump_only src 192.168.1.3 #webtv
acl bump_only src 192.168.1.4 #toshiba
acl bump_only src 192.168.1.5 #imac
acl bump_only src 192.168.1.9 #macbook
acl bump_only src 192.168.1.13 #dell

You have a previous "cache allow all". This below rule does nothing.

cache deny https_login
ssl_bump peek step1
miss_access deny no_miss
ssl_bump splice https_login
ssl_bump splice splice_only
ssl_bump splice NoSSLIntercept
ssl_bump bump bump_only markBumped
ssl_bump stare all
acl markedBumped note bumped true
url_rewrite_access deny markedBumped
http_access deny all
read_ahead_gap 32 KB
negative_ttl 1 second
connect_timeout 30 seconds
request_timeout 60 seconds
half_closed_clients off
shutdown_lifetime 10 seconds
negative_dns_ttl 1 seconds
ignore_unknown_nameservers on
pipeline_prefetch 100
#acl SSLIntercept ssl::server_name_regex -i '/usr/local/pkg/url.bump'
#ssl_bump bump SSLIntercept

You already have an earlier "http_access deny all". The below lines do nothing.

# Setup allowed ACLs
# Allow local network(s) on interface(s)
http_access allow localnet
# Default block all to be sure
http_access deny allsrc


HTH
Amos
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