CentOS6.8搭建OpenVPN

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所需软件:lzo-2.10.tar.gzopenvpn-2.4.3.tar.gz

其他版本下载地址:

http://www.oberhumer.com/opensource/lzo/download/

http://build.openvpn.net/downloads/releases/

安装软件:yum install -y gcc gcc-c++ openssl-devel pam-devel

安装lzo:

tarxflzo-2.10.tar.gz
cdlzo-2.10
./configure--prefix=/usr/local
make&&makeinstall

安装路径使用/usr/local而不是/usr/local/lzo是为了解决安装openvpn时候找不到 lzo_lib 的问题。

tarxfopenvpn-2.4.3.tar.gz
cdopenvpn-2.4.3
./configure--prefix=/usr/local/openvpn
make&&makeinstall

编译访问控制模块:

在当前安装目录中新建文件 minimal_pf.c

/*minimal_pf.c
*ultra-minimalOpenVPNplugintoenableinternalpacketfilter*/
#include<stdio.h>
#include<stdlib.h>

#include"include/openvpn-plugin.h"

/*dummycontext,asweneednostate*/
structplugin_context{
intdummy;
};

/*Initializationfunction*/
OPENVPN_EXPORTopenvpn_plugin_handle_topenvpn_plugin_open_v1(unsignedint*type_mask,constchar*argv[],constchar*envp[]){
structplugin_context*context;
/*Allocateourcontext*/
context=(structplugin_context*)calloc(1,sizeof(structplugin_context));

/*Whichcallbackstointercept.*/
*type_mask=OPENVPN_PLUGIN_MASK(OPENVPN_PLUGIN_ENABLE_PF);

return(openvpn_plugin_handle_t)context;
}

/*Workerfunction*/
OPENVPN_EXPORTintopenvpn_plugin_func_v2(openvpn_plugin_handle_thandle,constinttype,constchar*envp[],void*per_client_context,structopenvpn_plugin_string_list**return_list){

if(type==OPENVPN_PLUGIN_ENABLE_PF){
returnOPENVPN_PLUGIN_FUNC_SUCCESS;
}else{
/*shouldnothappen!*/
returnOPENVPN_PLUGIN_FUNC_ERROR;
}
}

/*Cleanupfunction*/
OPENVPN_EXPORTvoidopenvpn_plugin_close_v1(openvpn_plugin_handle_thandle){
structplugin_context*context=(structplugin_context*)handle;
free(context);
}

其他版本的openvpn可能需要修改包含头文件(#include "include/openvpn-plugin.h"),2.1.4版本的openvpn-plugin.h是在根目录

编译:

CC_FLAGS="-O2-Wall-g"
NAME=minimal_pf
gcc$CC_FLAGS-fPIC-c$NAME.c&&gcc$CC_FLAGS-fPIC-shared-Wl,-soname,$NAME.so-o$NAME.so$NAME.o-lc

把编译产生的文件复制到openvpn文件夹中

cp-aminimal_pf.so/usr/local/openvpn/lib/openvpn/plugins/

新版本openvpn好像没有证书管理工具,可以从旧版本中复制过来,只是为了生成一套根证书而已,直接从其他服务器复制几个证书文件过来也可以用。

从旧版本openvpn-2.1.4.tar.gz中复制easy-rsa目录,使用2.0版本工具,修改vars文件中的变量(非必须),加载到当前Shell。

cp-aopenvpn-2.4.3/easy-rsa/usr/local/openvpn/
cd/usr/local/openvpn/easy-rsa/2.0/
sourcevars

清理证书目录

./clean-all

生成CA证书,输入部分可以直接回车,[y/n]部分填y

./build-ca

生成服务器证书,server为任意名字,输入部分可以直接回车,[y/n]部分填y

./build-key-serverserver

生成Diffie Hellman文件,提高安全性

./build-dh

建立其他目录

cd/usr/local/openvpn/
mkdirccdconflogspf

openvpn服务器配置:conf/server.conf

port1194
protoudp
devtun
ca/usr/local/openvpn/easy-rsa/2.0/keys/ca.crt
cert/usr/local/openvpn/easy-rsa/2.0/keys/server.crt
key/usr/local/openvpn/easy-rsa/2.0/keys/server.key
dh/usr/local/openvpn/easy-rsa/2.0/keys/dh1024.pem
server10.8.0.0255.255.255.0
ifconfig-pool-persist/usr/local/openvpn/conf/ipp.txt
push"route192.168.100.0255.255.255.0"
keepalive10120
comp-lzo
persist-key
persist-tun
status/usr/local/openvpn/logs/openvpn-status.log
log/usr/local/openvpn/logs/openvpn.log
verb3
auth-user-pass-verify/usr/local/openvpn/sbin/checkpsw.shvia-env
plugin/usr/local/openvpn/lib/openvpn/plugins/minimal_pf.so
client-connect/usr/local/openvpn/sbin/client-connect.sh
client-config-dir/usr/local/openvpn/ccd
client-to-client
client-cert-not-required
username-as-common-name
script-security3

密码认证脚本/usr/local/openvpn/sbin/checkpsw.sh:

#!/bin/bash
PASSFILE="/usr/local/openvpn/conf/psw-file"
LOG_FILE="/usr/local/openvpn/logs/openvpn-password.log"
TIME_STAMP=`date"+%Y-%m-%d%T"`
if[!-r"${PASSFILE}"];then
echo"${TIME_STAMP}:Couldnotopenpasswordfile\"${PASSFILE}\"forreading.">>${LOG_FILE}
exit1
fi
CORRECT_PASSWORD=`awk'!/^;/&&!/^#/&&$1=="'${username}'"{print$2;exit}'${PASSFILE}`
if["${CORRECT_PASSWORD}"=""];then
echo"${TIME_STAMP}:Userdoesnotexist:username=\"${username}\",password=\"${password}\".">>${LOG_FILE}
exit1
fi

if["${password}"="${CORRECT_PASSWORD}"];then
echo"${TIME_STAMP}:Successfulauthentication:username=\"${username}\".">>${LOG_FILE}
exit0
fi
echo"${TIME_STAMP}:Incorrectpassword:username=\"${username}\",password=\"${password}\".">>${LOG_FILE}
exit1

访问控制脚本 /usr/local/openvpn/sbin/client-connect.sh:

#!/bin/bash
template="/usr/local/openvpn/pf/${common_name}.pf"

if[-f"$template"]&&[!-z"$pf_file"];then
cp--"$template""$pf_file"
else
exit1
fi

加可执行权限:

chmod+xsbin/checkpsw.shsbin/client-connect.sh

增加用户名和密码文件

cat/usr/local/openvpn/conf/psw-file
user1passd1
user2passd2

增加个人配置文件(用于根据用户分配路由等配置,非必须):

cat/usr/local/openvpn/ccd/user1
push"route192.168.101.0255.255.255.0"

增加访问控制文件(必须),缺少访问控制文件登录失败,防止权限出错:

cat/usr/local/openvpn/pf/user1
[CLIENTSACCEPT]
[SUBNETSACCEPT]
+192.168.100.0/28
-0.0.0.0/0
[END]

以上配置文件,+是允许,-是拒绝,ACCEPT也可以改为DROP,CLIENTS部分填写用户名,具体用法有待探讨。

开启IP转发和NAT,端口eth0和网段10.8.0.0/24根据实际配置调整:

echo"net.ipv4.ip_forward=1">>/etc/sysctl.conf
sysctp-p
iptables-tnat-APOSTROUTING-oeth0-s10.8.0.0/24-jMASQUERADE
/etc/init.d/iptablessave
chkconfigiptableson

启动openvpn服务:

/usr/local/openvpn/sbin/openvpn--config/usr/local/openvpn/conf/server.conf--daemon

查看日志,出现 Initialization Sequence Completed 则启动成功:

tailflogs/openvpn.log
ThuSep2814:06:302017MULTI:multi_initcalled,r=256v=256
ThuSep2814:06:302017IFCONFIGPOOL:base=10.8.0.4size=62,ipv6=0
ThuSep2814:06:302017ifconfig_pool_read(),in='ouzy,10.8.0.4',TODO:IPv6
ThuSep2814:06:302017succeeded->ifconfig_pool_set()
ThuSep2814:06:302017ifconfig_pool_read(),in='gcc,10.8.0.8',TODO:IPv6
ThuSep2814:06:302017succeeded->ifconfig_pool_set()
ThuSep2814:06:302017IFCONFIGPOOLLIST
ThuSep2814:06:302017ouzy,10.8.0.4
ThuSep2814:06:302017gcc,10.8.0.8
ThuSep2814:06:302017InitializationSequenceCompleted

Windows客户端从openvpn.net下载安装openvpn-install-*.exe

下载页面https://openvpn.net/index.php/open-source/downloads.html

把服务器的CA证书 /usr/local/openvpn/easy-rsa/2.0/keys/ca.crt 下载并复制到客户端的openvpn安装目录config下,再在config目录新建一个配置文件client.ovpn ,名字随意,后缀名要一致,把配置文件的x.x.x.x换成openvpn服务器IP:

setenvCLIENT_CERT0
client
devtun
protoudp
remotex.x.x.x1194
resolv-retryinfinite
nobind
persist-key
persist-tun
auth-user-pass
ns-cert-typeserver
comp-lzo
verb3
auth-nocache
reneg-sec0
caca.crt

打开客户端连接,输入用户名密码即可。

原文链接:https://www.f2er.com/centos/375722.html

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