I've just installed Squid 3.5.27 on Ubuntu Server 18.04
user@ubuntu:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 18.04 LTS Release: 18.04 Codename: bionic user@ubuntu:~$ user@ubuntu:~$ dpkg -l | grep squid ii squid 3.5.27-1ubuntu1 amd64 Full featured Web Proxy cache (HTTP proxy) ii squid-common 3.5.27-1ubuntu1 all Full featured Web Proxy cache (HTTP proxy) - common files ii squid-langpack 20170901-1 all Localized error pages for Squid user@ubuntu:~$ user@ubuntu:~$ squid -v Squid Cache: Version 3.5.27 Service Name: squid Ubuntu linux configure options: '--build=x86_64-linux-gnu' '--prefix=/usr' '--includedir=${prefix}/include' '--mandir=${prefix}/share/man' '--infodir=${prefix}/share/info' '--sysconfdir=/etc' '--localstatedir=/var' '--libexecdir=${prefix}/lib/squid3' '--srcdir=.' '--disable-maintainer-mode' '--disable-dependency-tracking' '--disable-silent-rules' 'BUILDCXXFLAGS=-g -O2 -fdebug-prefix-map=/build/squid3-28YJxG/squid3-3.5.27=. -fstack-protector-strong -Wformat -Werror=format-security -Wno-error=deprecated -Wno-error=format-truncation -Wdate-time -D_FORTIFY_SOURCE=2 -Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -Wl,--as-needed' '--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-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' '--enable-build-info=Ubuntu linux' '--enable-linux-netfilter' 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fdebug-prefix-map=/build/squid3-28YJxG/squid3-3.5.27=. -fstack-protector-strong -Wformat -Werror=format-security -Wall' 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -Wl,--as-needed' 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2' 'CXXFLAGS=-g -O2 -fdebug-prefix-map=/build/squid3-28YJxG/squid3-3.5.27=. -fstack-protector-strong -Wformat -Werror=format-security -Wno-error=deprecated -Wno-error=format-truncation' user@ubuntu:~$ Unfortunately, it doesn't work. This is the /var/log/squid/access.log
user@ubuntu:~$ sudo tail -F /var/log/squid/access.log 1530545854.655 1 192.168.0.254 TCP_DENIED/403 4037 GET - HIER_NONE/- text/html 1530545857.667 1 192.168.0.254 TCP_DENIED/403 4037 GET - HIER_NONE/- text/html 1530545860.673 0 192.168.0.254 TCP_DENIED/403 4037 GET - HIER_NONE/- text/html This is /etc/squid/squid.conf config
user@ubuntu:~$ egrep -nv '^#|^$' /etc/squid/squid.conf 980:acl localnet src 192.168.0.0/24 982:acl SSL_ports port 443 983:acl Safe_ports port 80 # http 984:acl Safe_ports port 21 # ftp 985:acl Safe_ports port 443 # https 986:acl Safe_ports port 70 # gopher 987:acl Safe_ports port 210 # wais 988:acl Safe_ports port 1025-65535 # unregistered ports 989:acl Safe_ports port 280 # http-mgmt 990:acl Safe_ports port 488 # gss-http 991:acl Safe_ports port 591 # filemaker 992:acl Safe_ports port 777 # multiling http 993:acl CONNECT method CONNECT 1170:http_access deny !Safe_ports 1173:http_access deny CONNECT !SSL_ports 1176:http_access allow localhost manager 1177:http_access deny manager 1192:http_access allow localhost 1195:http_access deny all 1613:http_port 3128 4256:coredump_dir /var/spool/squid 4887:refresh_pattern ^ftp: 1440 20% 10080 4888:refresh_pattern ^gopher: 1440 0% 1440 4889:refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 4890:refresh_pattern (Release|Packages(.gz)*)$ 0 20% 2880 4893:refresh_pattern . 0 20% 4320 user@ubuntu:~$ What caused the issue? Was it ACL?
How to fix it?
1 Answer
line 1195 - http_access deny all
That's a catch-all rule that is going to block traffic that hasn't been specifically allowed in the config. Which, if this is your whole config, is nothing. Looks like you've got a stock config that will require some allow rules. Alternatively, modify the http_access deny all and change the deny to allow
If you intend to have authentication setup, you can do something like this:
### enforce authentication http_access deny !auth # deny anyone that isn't authenticated http_access allow auth # allow authenticated users http_access deny all # final catch-all that should never actually be met. If you haven't setup authentication yet, then you just need this:
http_access allow all 
