我刚刚在 Ubuntu Server 18.04 上安装了 Squid 3.5.27
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:~$
不幸的是，它不起作用。这是/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 http://detectportal.firefox.com/success.txt - HIER_NONE/- text/html
1530545857.667 1 192.168.0.254 TCP_DENIED/403 4037 GET http://detectportal.firefox.com/success.txt - HIER_NONE/- text/html
1530545860.673 0 192.168.0.254 TCP_DENIED/403 4037 GET http://detectportal.firefox.com/success.txt - HIER_NONE/- text/html
这是/etc/squid/squid.conf配置
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:~$
是什么导致了这个问题？是 ACL 吗？
如何修复？
答案1
第 1195 行 - http_access 全部拒绝
这是一条包罗万象的规则，它将阻止配置中未明确允许的流量。如果这是您的整个配置，那它就没什么用了。看起来您有一个需要一些允许规则的常规配置。或者，修改 http_access 拒绝所有并将拒绝更改为允许
如果您打算设置身份验证，您可以执行以下操作：
### 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.
如果您尚未设置身份验证，那么您只需要这个：
http_access allow all