本次ubuntu的版本

root@node2:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 12.04.5 LTS
Release:    12.04
Codename:   precise

ip地址

root@node2:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8 scope host lo
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000link/ether 00:16:3e:00:3f:b0 brd ff:ff:ff:ff:ff:ffinet 10.168.198.51/21 brd 10.168.199.255 scope global eth0
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000link/ether 00:16:3e:00:48:5d brd ff:ff:ff:ff:ff:ffinet 121.41.48.13/22 brd 121.41.51.255 scope global eth1

一、open***原理

open***通过使用公开密钥（非对称密钥，加密解密使用不同的key，一个称为Publice key，另外一个是Private key）对数据进行加密的。这种方式称为TLS加密

open***使用TLS加密的工作过程是，首先××× Sevrver端和××× Client端要有相同的CA证书，双方通过交换证书验证双方的合法性，用于决定是否建立×××连接。

然后使用对方的CA证书，把自己目前使用的数据加密方法加密后发送给对方，由于使用的是对方CA证书加密，所以只有对方CA证书对应的Private key才能解密该数据，这样就保证了此密钥的安全性，并且此密钥是定期改变的，对于窃听者来说，可能还没有破解出此密钥，×××通信双方可能就已经更换密钥了。

二、安装open***

1、直接使用apt-get安装

sudo apt-get -y install open*** libssl-dev openssl

2、查看版本

root@node2:~# open*** --version
Open××× 2.2.1 x86_64-linux-gnu [SSL] [LZO2] [EPOLL] [PKCS11] [eurephia] [MH] [PF_INET6] [IPv6 payload 20110424-2 (2.2RC2)] built on Dec  1 2014
Originally developed by James Yonan
Copyright (C) 2002-2010 Open××× Technologies, Inc. <sales@open***.net>

3、准备工作

root@node2:~# cp -a /usr/share/doc/open***/examples/easy-rsa/2.0/ /etc/open***/easy-rsa
root@node2:~# cp /usr/share/doc/open***/examples/sample-config-files/server.conf.gz /etc/open***/
root@node2:~# cp /usr/share/doc/open***/examples/sample-config-files/client.conf /etc/open***/
root@node2:~# cd /etc/open*** && gzip -d server.conf.gz
root@node2:/etc/open***# ls
easy-rsa server.conf update-resolv-conf

三、制作相关证书(使用root权限)

1、编辑vars文件

root@node2:/etc/open***# cd easy-rsa
root@node2:/etc/open***/easy-rsa# vim vars
export KEY_COUNTRY="CN"
export KEY_PROVINCE="NJ"
export KEY_CITY="NanJing"
export KEY_ORG="health"
export KEY_EMAIL="yao@health.com"
export KEY_NAME='***-server'
export KEY_OU='health'root@node2:/etc/open***/easy-rsa# source vars
NOTE: If you run ./clean-all, I will be doing a rm -rf on /etc/open***/easy-rsa/keys
root@node2:/etc/open***/easy-rsa# ./clean-all

2、制作CA证书

root@node2:/etc/open***/easy-rsa# ./build-ca         # 一路回车即可
root@node2:/etc/open***/easy-rsa# ls keys
ca.crt ca.key index.txt serial

3、制作server端证书

root@node2:/etc/open***/easy-rsa# ./build-key-server ***-server   # 证书名，vars中的KEY_NAME,同样一路回车
root@node2:/etc/open***/easy-rsa# ls /keys
01.pem ca.crt ca.key index.txt index.txt.attr index.txt.old serial serial.old ***-server.crt ***-server.csr ***-server.key

4、生成加密交换时的Diffie-Hellman文件

root@node2:/etc/open***/easy-rsa# ./build-dh
root@node2:/etc/open***/easy-rsa# ls /keys
01.pem ca.crt ca.key dh1024.pem index.txt index.txt.attr index.txt.old serial serial.old ***-server.crt ***-server.csr ***-server.key

5、制作client端证书

root@node2:/etc/open***/easy-rsa# ./build-key ***-client      # 证书名随意，一路回车
root@node2:/etc/open***/easy-rsa# ls /keys
01.pem ca.crt ca.key dh1024.pem ***-client.crt ***-client.csr ***-client.key index.txt index.txt.attr index.txt.old serial serial.old ***-server.crt ***-server.csr ***-server.key

6、编辑server端配置文件

root@node2:/etc/open***/easy-rsa# cd ..
root@node2:/etc/open***# egrep '^[^(#|;)].*' server.conf
port 1194
proto tcp    # 修改成tcp协议
dev tun
ca /etc/open***/easy-rsa/keys/ca.crt            # 修改成ca证书的路径
cert /etc/open***/easy-rsa/keys/***-server.crt  # ×××路径
key /etc/open***/easy-rsa/keys/***-server.key   # 修改密钥路径
dh /etc/open***/easy-rsa/keys/dh1024.pem        # 修改Diffie-Hellman文件路径
server 10.8.0.0 255.255.255.0
ifconfig-pool-persist ipp.txt
push "route 10.168.198.0 255.255.255.0"
client-config-dir ccd
keepalive 10 120
comp-lzo
persist-key
persist-tun
status open***-status.log
verb 3

四、启动服务

root@node2:/etc/open***# service open*** start
root@node2:/etc/open***# ss -tnl | grep 1194          # 端口已经开启
LISTEN     0      1                         *:1194                     *:*

五、配置windows客户端

1、直接安装与server端相同的版本

2、将ca证书，客户端证书，客户端密钥，客户端配置文件放到windows的配置文件路径下

3、编辑client配置文件

4、启动

5、显示已连接

六、配置linux客户端

以centos 6.5 为例

1、直接yum安装open***

[root@test ~]# yum install -y open***

2、新建配置文件目录

[root@test ~]# mkdir /etc/open***/client && cd /etc/open***/client

3、将ca证书，客户端证书，客户端密钥，客户端配置文件放到配置文件目录

[root@test client]# ls
ca.crt  client.o***  ***-client.crt  ***-client.key

4、配置文件与win的相同

[root@test client]# egrep '^[^(#|;)].*' client.o***
client
dev tun
proto tcp
remote 121.41.48.133 1194
resolv-retry infinite
nobind
persist-key
persist-tun
ca /etc/open***/client/ca.crt
cert /etc/open***/client/***-client.crt
key /etc/open***/client/***-client.key
ns-cert-type server
comp-lzo
verb 3

5、后台启动

[root@test client]# /usr/sbin/open***  --config /etc/open***/client/client.o*** > /var/log/open***.log &

6、查看ip地址，多了一个tun0

[root@haproxy client]#
[root@haproxy client]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8 scope host loinet6 ::1/128 scope host valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000link/ether 52:54:00:c3:69:30 brd ff:ff:ff:ff:ff:ffinet 192.168.3.201/24 brd 192.168.3.255 scope global eth0inet6 fe80::5054:ff:fec3:6930/64 scope link valid_lft forever preferred_lft forever
4: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 100link/[65534] inet 10.8.0.6 peer 10.8.0.5/32 scope global tun0

7、测试

客户端尝试ping服务端

[root@test client]# ping 10.8.0.1 -c 1
PING 10.8.0.1 (10.8.0.1) 56(84) bytes of data.
64 bytes from 10.8.0.1: icmp_seq=1 ttl=64 time=10.4 ms[root@test client]# ping 10.168.198.51 -c 1
PING 10.168.198.51 (10.168.198.51) 56(84) bytes of data.
64 bytes from 10.168.198.51: icmp_seq=1 ttl=64 time=10.4 ms

服务器端尝试ping客户端

root@node2:/etc/open***# ping 10.8.0.6 -c 1
PING 10.8.0.6 (10.8.0.6) 56(84) bytes of data.
64 bytes from 10.8.0.6: icmp_req=1 ttl=64 time=9.93 ms

测试成功！