CentOS 5 下 OpenVPN 和 Windows 下 OpenVPN GUI 安装笔记

由 admin 于星期六, 2009-05-09 00:27 发表

此笔记,基于 "程序员小辉"的安装笔记修改 --------------------------------------------------------------------------------------------------------------------

一. OpenVPN 安装环境

Server 端的环境

CentOS, kernel版本: 2.6.18, IP 为 221.233.59.16(ADSL拨号)
kernel 需要支持 tun 设备, 需要加载 iptables 模块.
安装的 OpenVPN 的版本: 2.1.rc15.(目前最新版可在http://openvpn.net 上下载).

Client 端的环境:

Windows XP SP2
openvpn-2.1_rc15-install.exe(此版本集成了 OpenVPN GUI 客户端)

二. OpenVPN 服务端安装过程

用putty登录到CentOS
下载LZO和OpenVPN 2.1.rc15

wget http://www.oberhumer.com/opensource/lzo/download/lzo-2.03.tar.gz
wget http://openvpn.net/release/openvpn-2.1_rc15.tar.gz

yum install -y openssl-devel

安装LZO和OpenVPN

tar zxvf lzo-2.03.tar.gz
cd lzo-2.03
./configure
make
make install
cd ..
tar zxvf openvpn-2.1_rc15.tar.gz
cd openvpn-2.1_rc15
./configure
make
make install
cd ..
cp /root/openvpn-2.1_rc15/easy-rsa/ -r /etc/openvpn

生成证书

初始化PKI

cd /etc/openvpn/2.0/#可以设置下OpenVPN参数(也可以修改vars文件来配置)
export D=`pwd`
export KEY_CONFIG=$D/openssl.cnf
export KEY_DIR=$D/keys
export KEY_SIZE=1024
export KEY_COUNTRY=CN
export KEY_PROVINCE=GD
export KEY_CITY=SZ
export KEY_ORG="dvdmaster"
export KEY_EMAIL="support@cooldvd.com"
#也可以不用设置直接执行下面的命令
. vars

创建证书颁发机构(CA)

./clean-all
./build-ca

Generating a 1024 bit RSA private key
................++++++
........++++++
writing new private key to 'ca.key'
-----
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [CN]:
State or Province Name (full name) [GD]:
Locality Name (eg, city) [SZ]:
Organization Name (eg, company) [dvdmaster]:
Organizational Unit Name (eg, section) []:dvdmaster
Common Name (eg, your name or your server's hostname) []:server
Email Address [support@cooldvd.com]:

建立server key

./build-key-server server

Generating a 1024 bit RSA private key
......++++++
....................++++++
writing new private key to 'server.key'
-----
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [CN]:
State or Province Name (full name) [GD]:
Locality Name (eg, city) [SZ]:
Organization Name (eg, company) [dvdmaster]:
Organizational Unit Name (eg, section) []:dvdmaster
Common Name (eg, your name or your server's hostname) []:server
Email Address [support@cooldvd.com]:

Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:abcd1234
An optional company name []:dvdmaster
Using configuration from /etc/openvpn/2.0/openssl.cnf
Check that the request matches the signature
Signature ok
The Subject's Distinguished Name is as follows
countryName           :PRINTABLE:'CN'
stateOrProvinceName   :PRINTABLE:'GD'
localityName          :PRINTABLE:'SZ'
organizationName      :PRINTABLE:'dvdmaster'
organizationalUnitName:PRINTABLE:'dvdmaster'
commonName            :PRINTABLE:'server'
emailAddress          :IA5STRING:'support@cooldvd.com'
Certificate is to be certified until Mar 19 08:15:31 2016 GMT (3650 days)
Sign the certificate? [y/n]:y

1 out of 1 certificate requests certified, commit? [y/n]y
Write out database with 1 new entries
Data Base Updated

生成客户端 key

./build-key client1
Generating a 1024 bit RSA private key
.....++++++
......++++++
writing new private key to 'client1.key'
-----
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [CN]:
State or Province Name (full name) [GD]:
Locality Name (eg, city) [SZ]:
Organization Name (eg, company) [dvdmaster]:
Organizational Unit Name (eg, section) []:dvdmaster
Common Name (eg, your name or your server's hostname) []:client1 #重要: 每个不同的client 生成的证书, 名字必须不同.
Email Address [support@cooldvd.com]:

Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:abcd1234
An optional company name []:dvdmaster
Using configuration from /etc/openvpn/2.0/openssl.cnf
Check that the request matches the signature
Signature ok
The Subject's Distinguished Name is as follows
countryName           :PRINTABLE:'CN'
stateOrProvinceName   :PRINTABLE:'GD'
localityName          :PRINTABLE:'SZ'
organizationName      :PRINTABLE:'dvdmaster'
organizationalUnitName:PRINTABLE:'dvdmaster'
commonName            :PRINTABLE:'client1'
emailAddress          :IA5STRING:'support@cooldvd.com'
Certificate is to be certified until Mar 19 08:22:00 2016 GMT (3650 days)
Sign the certificate? [y/n]:y

1 out of 1 certificate requests certified, commit? [y/n]y
Write out database with 1 new entries
Data Base Updated

以此类推建立其他客户端 key

./build-key client2
./build-key client3

注意在进入 Common Name (eg, your name or your server's hostname) []: 的输入时, 每个证书输入的名字必须不同.

生成Diffie Hellman参数

./build-dh

将 keys 下的所有文件打包下载到本地(可以通过winscp,http,ftp等等......)

tar zcvf yskeys.tar.gz keys/

创建服务端配置文件

mkdir /etc/openvpn/2.0/conf
cp /root/openvpn-2.1_rc15/sample-config-files/server.conf /etc/openvpn/2.0/conf/server.conf

服务端配置文件(server.conf)样例

port 1194

proto udp

dev tun

ca /etc/openvpn/2.0/keys/ca.crt
cert /etc/openvpn/2.0/keys/ovpnser.crt
key /etc/openvpn/2.0/keys/ovpnser.key  # This file should be kept secret

dh /etc/openvpn/2.0/keys/dh1024.pem

server 10.8.0.0 255.255.255.0

ifconfig-pool-persist ipp.txt

push "redirect-gateway def1 bypass-dhcp"

push "dhcp-option DNS 10.8.0.1"
push "dhcp-option DNS 202.103.44.150" #客户端获得的DNS地址
push "dhcp-option DNS 202.103.24.68" #客户端获得的DNS地址

client-to-client

keepalive 10 120

comp-lzo

user nobody
group nobody

persist-key
persist-tun

status openvpn-status.log

verb 3

启动OpenVPN

/usr/local/sbin/openvpn --config /etc/openvpn/2.0/conf/server.conf &

三. OpenVPN GUI For Windows 客户端安装过程

下载 openvpn-2.1_rc15-install.exe(此版本集成 OpenVPN GUI)

官方下载地址:http://openvpn.net/release/openvpn-2.1_rc15-install.exe

依屏幕指示安装OpenVPN GUI
配置 openvpn gui

将上面第6步打包的yskeys.tar.gz中的下列证书文件解压到你的OpenVPN GUI安装路径\OpenVPN\config文件夹下

ca.crt
ca.key
client1.crt
client1.csr
client1.key

修改client.ovpn

把你的OpenVPN GUI安装路径\OpenVPN\sample-config下的client.ovpn文件复制到你的OpenVPN GUI安装路径\OpenVPN\config文件夹下,用记事本打开client.ovpn

#找到remote my-server-1 1194,把my-server-1改成你的ip地址
remote 221.233.59.16 1194

双击 client.ovpn 即可启动 openvpn, 或者通过 OpenVPN GUI 的控制启动 VPN.

三. OpenVPN 访问外网的设置

开启CentOS 5 的路由转发功能

echo 1 > /proc/sys/net/ipv4/ip_forward
#为了使CentOS重启后仍然开启路由转发功能我们需要再执行下列命令
sysctl -w net.ipv4.ip_forward=1

添加iptables转发规则

#因为我那天CentOS是ADSL拨号上网,所以把出口设置成ppp0,请根据实际情况设置
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o ppp0 -j MASQUERADE

必须保证server.conf配置中,有下面三个配置

push "dhcp-option DNS 10.8.0.1"
push "dhcp-option DNS 202.103.44.150" #客户端获得的DNS地址
push "dhcp-option DNS 202.103.24.68" #客户端获得的DNS地址

当 client 连接成功后, 在 cmd 下执行 ipconfig /all, 应该有这类似这样的输出:

Ethernet adapter 本地连接 2:

        Connection-specific DNS Suffix  . :
        Description . . . . . . . . . . . : TAP-Win32 Adapter V9
        Physical Address. . . . . . . . . : 00-FF-F2-1A-44-BD
        Dhcp Enabled. . . . . . . . . . . : Yes
        Autoconfiguration Enabled . . . . : Yes
        IP Address. . . . . . . . . . . . : 10.8.0.6
        Subnet Mask . . . . . . . . . . . : 255.255.255.252
        Default Gateway . . . . . . . . . : 10.8.0.5
        DHCP Server . . . . . . . . . . . : 10.8.0.5
        DNS Servers . . . . . . . . . . . : 10.8.0.1
                                            202.103.44.150
                                            202.103.24.68
        Lease Obtained. . . . . . . . . . : 2009年5月8日 23:55:06
        Lease Expires . . . . . . . . . . : 2010年5月8日 23:55:06

四. 设置 OpenVPN 服务器 reboot后自动启动 openvpn

执行

vi /etc/rc.local

然后在最后面加入此行:

/usr/local/sbin/openvpn --config /etc/openvpn/2.0/conf/server.conf &

五.OpenVPN 测试

连接成功之后,去www.ip138.com上看看外网ip是多少,如果是CentOS系统的外网ip那说明测试成功了~

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CentOS 5 下 OpenVPN 和 Windows 下 OpenVPN GUI 安装笔记

一. OpenVPN 安装环境

四. 设置 OpenVPN 服务器 reboot后自动启动 openvpn

五.OpenVPN 测试

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