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Squid TCP_DENIED / 403 4037 GET http://detectportal.firefox.com/success.txt-HIER_NONE /-text / html

Ubuntu Server 18.04にSquid 3.5.27をインストールしました

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:~$

残念ながら、機能しません。これは/var/log/squid/access.logです

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

これは/etc/squid/squid.conf configです

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:~$

問題の原因は何ですか？ ACLでしたか？

修正方法

squid
2
Sabrina

1195行目-http_accessすべて拒否

これは、構成で特に許可されていないトラフィックをブロックするキャッチオールルールです。これが設定全体である場合、これは何もありません。いくつかの許可ルールを必要とするストック設定があるようです。または、http_access deny allを変更し、許可するように拒否を変更します

認証をセットアップする場合は、次のようなことができます。

### 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.

認証をまだセットアップしていない場合は、これが必要です。

http_access allow all
3
Joey