Linux squid代理web服务器

squid代理web服务器

有时候内网很多机器都不能上外网，只能开放几个特定ip访问外网， 那么可以在这个可以上外网的机器上面搭建代理服务器，其他机器配置好代理就能上网了。

不管是测试用途还是自己使用，squid都是一个很不错的代理工具。支持正向代理、反向代理、还有透明代理。 本篇演示搭建了一个简单的squid的正向代理，同时支持认证。

1 代理服务器配置

1.1 安装

yum install squid -y
yum install httpd-tools -y

1.2 生成密码文件

mkdir /etc/squid3/
cd /etc/squid3/
htpasswd -cd /etc/squid3/passwords username

username 是用户名
提示输入密码，在这里我设的密码为 rootrootbr/>注意密码不要超过8位，且密码不能"@"符号；
在/etc/squid3/目录下会有passwords文件生成

1.3 测试密码文件

/usr/lib64/squid/basic_ncsa_auth /etc/squid3/passwords
username rootroot   # 输入：用户名+空格+密码
OK

提示：

• OK说明成功，
• ERR是有问题，请检查一下之前步骤

测试完成，crtl + c 打断

1.4 配置

vim /etc/squid/squid.conf

# 在最后添加
auth_param basic program /usr/lib64/squid/basic_ncsa_auth /etc/squid3/passwords
auth_param basic realm proxy
acl authenticated proxy_auth REQUIRED
http_access allow authenticated

# 这里是端口号，可以按需修改
# http_port 3128 这样写会同时监听ipv6和ipv4的端口，推荐适应下面的配置方法。
http_port 0.0.0.0:3128

1.5 权限控制

squid的权限控制很灵活，具体配置方法可以参考 官方文档， 或者 Squid中文权威指南， 具体工作原理有点像iptables，用规则去卡控流量。默认的配置只能允许内网用户访问，如果有更多需求，你还可以指定很多规则！

下面是官方默认配置文件：

$ cat /etc/squid/squid.conf
# Example rule allowing access from your local networks.
# Adapt to list your (internal) IP networks from where browsing
# should be allowed
acl localnet src 10.0.0.0/8 # RFC1918 possible internal network
acl localnet src 172.16.0.0/12  # RFC1918 possible internal network
acl localnet src 192.168.0.0/16 # RFC1918 possible internal network
acl localnet src fc00::/7       # RFC 4193 local private network range
acl localnet src fe80::/10      # RFC 4291 link-local (directly plugged) machines

acl SSL_ports port 443
acl Safe_ports port 80      # http
acl Safe_ports port 21      # ftp
acl Safe_ports port 443     # https
acl Safe_ports port 70      # gopher
acl Safe_ports port 210     # wais
acl Safe_ports port 1025-65535  # unregistered ports
acl Safe_ports port 280     # http-mgmt
acl Safe_ports port 488     # gss-http
acl Safe_ports port 591     # filemaker
acl Safe_ports port 777     # multiling http
acl CONNECT method CONNECT

#
# Recommended minimum Access Permission configuration:
#
# Deny requests to certain unsafe ports
http_access deny !Safe_ports

# Deny CONNECT to other than secure SSL ports
http_access deny CONNECT !SSL_ports

# Only allow cachemgr access from localhost
http_access allow localhost manager
http_access deny manager

# We strongly recommend the following be uncommented to protect innocent
# web applications running on the proxy server who think the only
# one who can access services on "localhost" is a local user
#http_access deny to_localhost

#
# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
#

# Example rule allowing access from your local networks.
# Adapt localnet in the ACL section to list your (internal) IP networks
# from where browsing should be allowed
http_access allow localnet
http_access allow localhost

# And finally deny all other access to this proxy
http_access deny all

# Squid normally listens to port 3128
http_port 3128

# Uncomment and adjust the following to add a disk cache directory.
#cache_dir ufs /var/spool/squid 100 16 256

# Leave coredumps in the first cache dir
coredump_dir /var/spool/squid

#
# 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

1.6 日志

squid的日志默认是打开的，位于目录/var/log/squid/，当然这个地址还有日志的格式都是可以完全自定义的

[root@controller161 ~]# ll /var/log/squid/
total 496
-rw-r----- 1 squid squid 355208 May  6 12:17 access.log
-rw-r----- 1 squid squid 125341 May  4 15:19 cache.log

1.7 启动服务

1.7.1 开启启动

systemctl enable squid.service

1.7.2 启动

systemctl start squid.service

1.7.3 停止

systemctl stop squid.service

1.7.4 重启

systemctl restart squid.service

2 代理客户端设置

在其他CentOS机器上面配置各种代理方法

2.1 全局代理

vim /etc/profile，在最后加入

export http_proxy="http://username:password@proxy_ip:port"
export https_proxy="http://username:password@proxy_ip:port"

2.2 yum代理设置

编辑/etc/yum.conf，在最后加入

# Proxy
proxy=http://username:password@proxy_ip:port/

2.3 wget的代理设置

编辑/etc/wgetrc，在最后加入

# Proxy
http_proxy=http://username:password@proxy_ip:port/
https_proxy=http://username:password@proxy_ip:port/
ftp_proxy=http://username:password@proxy_ip:port/

2.4 curl的代理设置

在~/.bashrc里面增加一个别名:

alias curl="curl -x http://username:password@proxy_ip:port"

另外一种方法是编辑~/.curlrc文件 (没有就创建一个):

proxy = http://username:password@proxy_ip:port

END

转：https://www.xncoding.com/2016/07/07/linux/squid.html
参考：http://blog.51cto.com/linuxme/372960
代理软件：frp ngrok shadowsocks