1. 下载并安装 Tor
yum install tor -y
2. 安装 obfs4
通过python进行编译安装
安装所需依赖软件模块
yum install make automake gcc python-pip python-devel libyaml-devel
安装 obfs4proxy
pip install obfsproxy
通过go进行编译安装
下载go的obfs4项目
git clone http://www.github.com/Yawning/obfs4
进入obfs4目录进行编译
go build -o obfs4proxy/obfs4proxy ./obfs4proxy
复制bofs4proxy到系统工作目录下
cp ./obfs4proxy/obfs4proxy /usr/bin/obfs4proxy
3. 配置 Tor Bridges
编辑配置文件
vim /etc/tor/torrc
定义一个 ORPort，不作为出口节点，设置成 Bridge：
Log notice file /var/log/tor/notices.log
RunAsDaemon 1
ORPort 6666
Exitpolicy reject *:*
BridgeRelay 1
ServerTransportPlugin obfs4 exec /usr/bin/obfs4proxy
ExtORPort auto
PublishServerDescriptor 0
重启tor服务
systemctl restart tor
查看tor服务状态
systemctl status tor
4. 使用网桥
查看日志文件：
tail -F /var/log/tor/notices.log
内容如下：
[notice] Your Tor server's identity key fingerprint is 'Unnamed
530FA95A79B9145D315F15F01215BE2F3BE921EB' [notice] Your Tor bridge's
hashed identity key fingerprint is 'Unnamed
83D1AC9EC2F15D7024278461DC91A8B2E9BBF43A' [notice] Registered server
transport 'obfs4' at '[::]:46396' [notice] Tor has successfully opened
a circuit. Looks like client functionality is working. [notice]
Bootstrapped 100%: Done [notice] Now checking whether ORPort
<redacted>:6666 is reachable... (this may take up to 20 minutes --
look for log messages indicating success) [notice] Self-testing
indicates your ORPort is reachable from the outside. Excellent.
注意：记住输出中 obfs4 监听的端口（本例中是 46396）。并且还能找到你的 server identity fingerprint（本例中是 530FA95A79B9145D315F15F01215BE2F3BE921EB），也复制下来。
在 /var/lib/tor/pt_state/obfs4_bridgeline.txt 文件中可以看到类似如下的内容：
Bridge obfs4 <IP ADDRESS>:<PORT> <FINGERPRINT>
cert=oG6a3K7CtearIloUp2OCUk60oNMgw+jVgCNhGumMkODS659UEgRRx7yxZuoEo9Crp9GGXg
iat-mode=0
根据日志中的信息获得最终的网桥配置：
obfs4 <IP ADDRESS>:46396 530FA95A79B9145D315F15F01215BE2F3BE921EB
cert=6LMNcXh6MIfApbZiMksnS4Kj+2sffZ5pybSqtcOO5YoHgfrMpkBJqvLxhuR2Ppau0L2seg
iatmode=0
5. 防火墙配置
编辑防火墙公共配置文件：
vim /etc/firewalld/zones/public.xml
内容如下(本例ORPort端口 => 6666, obfs4端口 => 46396)：
<port protocol="tcp" port="ORPort端口"/>
<port protocol="udp" port="ORPort端口"/>
<port protocol="tcp" port="obfs4端口"/>
<port protocol="udp" port="obfs4端口"/>
使防火墙配置生效：
firewall-cmd --complete-reload