Bug #12732
openSquid https filtering squidguard acl target list - erratic behaviour
0%
Description
Bug that could be described as an erratic behaviour in squid https filtering : some websites specified in squidgard target categories pass through the web filtering, and some don't.
Investigations using a very simplified pfsense configuration as follows :
- fresh install of pfsense 2.5.2 whith only squid and squidguard installed
- squid with default configuration, transparent mode and SSL man in the middle filtering activated (with an internal CA created through the certificate manager with default parameters)
- squidguard : created a target categorie with two URLs, parisaeroport.fr and visitstrasbourg.fr, and denying this in Common ACL target rules list.
Result : parisaeroport.fr is blocked as intended, but visitstrasbourg.fr is not blocked at all, without any clear records in squid logs that could highlight that difference.
It is not a cache problem.
Squidguard configuration file :
# ============================================================ # SquidGuard configuration file # This file generated automaticly with SquidGuard configurator # (C)2006 Serg Dvoriancev # email: dv_serg@mail.ru # ============================================================ logdir /var/squidGuard/log dbhome /var/db/squidGuard # dest target_test { domainlist target_test/domains log block.log } # rew safesearch { s@(google..*/search?.*q=.*)@&safe=active@i s@(google..*/images.*q=.*)@&safe=active@i s@(google..*/groups.*q=.*)@&safe=active@i s@(google..*/news.*q=.*)@&safe=active@i s@(yandex..*/yandsearch?.*text=.*)@&fyandex=1@i s@(search.yahoo..*/search.*p=.*)@&vm=r&v=1@i s@(search.live..*/.*q=.*)@&adlt=strict@i s@(search.msn..*/.*q=.*)@&adlt=strict@i s@(.bing..*/.*q=.*)@&adlt=strict@i s@(duckduckgo..*/?.*q=.*)@&kp=1@i s@(rambler..*/?.*query=.*)@&adult=family@i s@(qwant..*/?.*q=.*)@&s=2@i s@(ecosia..*/search.*q=.*)@&safesearch=2@i s@(onesearch..*/yhs/search.*)@&vm=r@i log block.log } # acl { # default { pass !target_test all redirect http://192.168.10.9:80/sgerror.php?url=403%20&a=%a&n=%n&i=%i&s=%s&t=%t&u=%u log block.log } }
Squid configuration :
# This file is automatically generated by pfSense # Do not edit manually ! http_port 192.168.10.9:3128 ssl-bump generate-host-certificates=on dynamic_cert_mem_cache_size=10MB 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:!RC4:!aNULL:!eNULL:!LOW:!3DES:!SHA1:!MD5:!EXP:!PSK:!SRP:!DSS tls-dh=prime256v1:/etc/dh-parameters.2048 options=NO_SSLv3,NO_TLSv1,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=10MB 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:!RC4:!aNULL:!eNULL:!LOW:!3DES:!SHA1:!MD5:!EXP:!PSK:!SRP:!DSS tls-dh=prime256v1:/etc/dh-parameters.2048 options=NO_SSLv3,NO_TLSv1,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=10MB 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:!RC4:!aNULL:!eNULL:!LOW:!3DES:!SHA1:!MD5:!EXP:!PSK:!SRP:!DSS tls-dh=prime256v1:/etc/dh-parameters.2048 options=NO_SSLv3,NO_TLSv1,SINGLE_DH_USE,SINGLE_ECDH_USE icp_port 0 digest_generation off dns_v4_first off pid_filename /var/run/squid/squid.pid cache_effective_user squid cache_effective_group proxy error_default_language fr icon_directory /usr/local/etc/squid/icons visible_hostname localhost cache_mgr admin@localhost 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,NO_TLSv1,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:!RC4:!aNULL:!eNULL:!LOW:!3DES:!SHA1:!MD5:!EXP:!PSK:!SRP:!DSS sslcrtd_children 5 logfile_rotate 0 debug_options rotate=0 shutdown_lifetime 3 seconds # Allow local network(s) on interface(s) acl localnet src 192.168.10.0/24 forwarded_for on uri_whitespace strip acl dynamic urlpath_regex cgi-bin ? cache deny dynamic cache_mem 64 MB maximum_object_size_in_memory 256 KB memory_replacement_policy heap GDSF cache_replacement_policy heap LFUDA minimum_object_size 0 KB maximum_object_size 4 MB cache_dir ufs /var/squid/cache 100 16 256 offline_mode off cache_swap_low 90 cache_swap_high 95 cache deny 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 3128 3129 1025-65535 acl sslports port 443 563 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 http_access allow manager localhost 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 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 # Package Integration url_rewrite_program /usr/local/bin/squidGuard -c /usr/local/etc/squidGuard/squidGuard.conf url_rewrite_bypass off url_rewrite_children 16 startup=8 idle=4 concurrency=0 # Custom options before auth # 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 ssl_bump peek step1 ssl_bump bump all # Setup allowed ACLs # Allow local network(s) on interface(s) http_access allow localnet # Default block all to be sure http_access deny allsrc
No data to display