centos7 openvpn搭建以及账号密码设置（针对easy-rsa版本为3.0.6）

olei 2,930 views 7

之前有一篇搭建openvpn的文章，很久以前写的了，easy-rsa版本是2的吧，这里一篇3.0.6的教程奉上，之前的教程链接如下：https://olei.me/181/

2,0的配置过程有什么问题，我忘记了，可能回答不上来，这个3.0.6的近期给公司搭建了，很多人在用，没什么问题；各位搭建中遇到什么问题直接留言吧，或者邮件也可以~

安装阶段

添加源

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup 
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
mv /etc/yum.repos.d/epel.repo /etc/yum.repos.d/epel.repo.backup
mv /etc/yum.repos.d/epel-testing.repo /etc/yum.repos.d/epel-testing.repo.backup 
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

安装openvpn、easy-rsa(easy-rsa版本为3.0.6为例)

yum install -y openvpn easy-rsa

配置阶段

配置easy-rsa3.0

cp -r /usr/share/easy-rsa/ /etc/openvpn/easy-rsa
cd /etc/openvpn/easy-rsa/
cd 3.0.6/
find / -type f -name "vars.example" | xargs -i cp {} . && mv vars.example vars

这里说明一下，正常来说 easy-rsa-3.0.6 安装完之后，vars.example 文件在 /usr/share/doc/easy-rsa-3.0.6/ 目录，至于有些人说找不到这个文件，我暂时还没遇到过，可能你的安装方式和我不一致，或版本不同

创建一个新的 PKI 和 CA

$ pwd
/etc/openvpn/easy-rsa/3.0.6
---
$ ./easyrsa init-pki  # 创建空的pki
Note: using Easy-RSA configuration from: ./vars

init-pki complete; you may now create a CA or requests.
Your newly created PKI dir is: /etc/openvpn/easy-rsa/3.0.6/pki
---
$ ./easyrsa build-ca nopass #创建新的CA，不使用密码
Note: using Easy-RSA configuration from: ./vars
Generating a 2048 bit RSA private key
......................+++
................................................+++
writing new private key to '/etc/openvpn/easy-rsa/3.0.6/pki/private/ca.key.pClvaQ1GLD'
-----
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.
-----
Common Name (eg: your user, host, or server name) [Easy-RSA CA]: 回车

CA creation complete and you may now import and sign cert requests.
Your new CA certificate file for publishing is at:
/etc/openvpn/easy-rsa/3.0.6/pki/ca.crt

创建服务端证书

$ pwd
/etc/openvpn/easy-rsa/3.0.6
---
$ ./easyrsa gen-req server nopass
Note: using Easy-RSA configuration from: ./vars
Generating a 2048 bit RSA private key
...........................+++
..............................................................................+++
writing new private key to '/etc/openvpn/easy-rsa/3.0.6/pki/private/server.key.wy7Q0fuG6A'
-----
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.
-----
Common Name (eg: your user, host, or server name) [server]: 回车

Keypair and certificate request completed. Your files are:
req: /etc/openvpn/easy-rsa/3.0.6/pki/reqs/server.req
key: /etc/openvpn/easy-rsa/3.0.6/pki/private/server.key

签约服务端证书

$ pwd
/etc/openvpn/easy-rsa/3.0.6
---
$ ./easyrsa sign server server

Note: using Easy-RSA configuration from: ./vars


You are about to sign the following certificate.
Please check over the details shown below for accuracy. Note that this request
has not been cryptographically verified. Please be sure it came from a trusted
source or that you have verified the request checksum with the sender.

Request subject, to be signed as a server certificate for 3650 days:

subject=
    commonName                = server


Type the word 'yes' to continue, or any other input to abort.
  Confirm request details: yes
Using configuration from ./openssl-1.0.cnf
Check that the request matches the signature
Signature ok
The Subject's Distinguished Name is as follows
commonName            :ASN.1 12:'server'
Certificate is to be certified until Apr  7 14:54:08 2028 GMT (3650 days)

Write out database with 1 new entries
Data Base Updated

Certificate created at: /etc/openvpn/easy-rsa/3.0.6/pki/issued/server.crt

创建Diffie-Hellman

$ pwd
/etc/openvpn/easy-rsa/3.0.6
---
$ ./easyrsa gen-dh

............................................................
DH parameters of size 2048 created at /etc/openvpn/easy-rsa/3.0.6/pki/dh.pem

创建客户端证书

  • 复制文件
$ cp -r /usr/share/easy-rsa/ /etc/openvpn/client/easy-rsa
$ cd /etc/openvpn/client/easy-rsa/
$ cd 3.0.6/
$ find / -type f -name "vars.example" | xargs -i cp {} . && mv vars.example vars
  • 生成证书
$ pwd
/etc/openvpn/client/easy-rsa/3.0.6
---
$ ./easyrsa init-pki #创建新的pki

Note: using Easy-RSA configuration from: ./vars

init-pki complete; you may now create a CA or requests.
Your newly created PKI dir is: /etc/openvpn/client/easy-rsa/3.0.6/pki
---
$ ./easyrsa gen-req eicas nopass  #客户证书名为eicas，木有密码

Note: using Easy-RSA configuration from: ./vars
Generating a 2048 bit RSA private key
....................................................+++
............+++
writing new private key to '/etc/openvpn/client/easy-rsa/3.0.6/pki/private/eicas.key.FkrLzXH9Bm'
-----
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.
-----
Common Name (eg: your user, host, or server name) [eicas]: 回车

Keypair and certificate request completed. Your files are:
req: /etc/openvpn/client/easy-rsa/3.0.3/pki/reqs/eicas.req
key: /etc/openvpn/client/easy-rsa/3.0.3/pki/private/eicas.key
  • 最后签约客户端证书
$ cd /etc/openvpn/easy-rsa/3.0.6/
$ pwd
/etc/openvpn/easy-rsa/3.0.6
---

$ ./easyrsa import-req /etc/openvpn/client/easy-rsa/3.0.6/pki/reqs/eicas.req eicas

Note: using Easy-RSA configuration from: ./vars

The request has been successfully imported with a short name of: eicas
You may now use this name to perform signing operations on this request.
---

$ ./easyrsa sign client eicas

Note: using Easy-RSA configuration from: ./vars


You are about to sign the following certificate.
Please check over the details shown below for accuracy. Note that this request
has not been cryptographically verified. Please be sure it came from a trusted
source or that you have verified the request checksum with the sender.

Request subject, to be signed as a client certificate for 3650 days:

subject=
    commonName                = eicas


Type the word 'yes' to continue, or any other input to abort.
  Confirm request details: yes
Using configuration from ./openssl-1.0.cnf
Check that the request matches the signature
Signature ok
The Subject's Distinguished Name is as follows
commonName            :ASN.1 12:'eicas'
Certificate is to be certified until Apr  8 01:54:57 2028 GMT (3650 days)

Write out database with 1 new entries
Data Base Updated

Certificate created at: /etc/openvpn/easy-rsa/3.0.6/pki/issued/eicas.crt

整理证书

现在所有的证书都已经生成完了，下面来整理一下。

  • 服务端所需要的文件
$ mkdir /etc/openvpn/certs
$ cd /etc/openvpn/certs/  
$ cp /etc/openvpn/easy-rsa/3.0.6/pki/dh.pem .        
$ cp /etc/openvpn/easy-rsa/3.0.6/pki/ca.crt .
$ cp /etc/openvpn/easy-rsa/3.0.6/pki/issued/server.crt .
$ cp /etc/openvpn/easy-rsa/3.0.6/pki/private/server.key .
$ ll
---
总用量 20
-rw-------. 1 root root 1172 4月  11 10:02 ca.crt
-rw-------. 1 root root  424 4月  11 10:03 dh.pem
-rw-------. 1 root root 4547 4月  11 10:03 server.crt
-rw-------. 1 root root 1704 4月  11 10:02 server.key
  • 客户端所需的文件
$ mkdir /etc/openvpn/client/eicas/
$ cp /etc/openvpn/easy-rsa/3.0.6/pki/ca.crt /etc/openvpn/client/eicas/
$ cp /etc/openvpn/easy-rsa/3.0.6/pki/issued/eicas.crt /etc/openvpn/client/eicas/
$ cp /etc/openvpn/client/easy-rsa/3.0.6/pki/private/eicas.key /etc/openvpn/client/eicas/
$ ll /etc/openvpn/client/eicas/
---
total 16
-rw------- 1 root root 1147 Feb 11 10:08 ca.crt
-rw------- 1 root root 4403 Feb 11 10:08 eicas.crt
-rw------- 1 root root 1708 Feb 11 10:09 eicas.key

配置server.conf

local 0.0.0.0
port 1194                       #指定端口
proto tcp                        #指定协议(可以指定udp，udp比tcp快)
dev tun

ca /etc/openvpn/certs/ca.crt
cert /etc/openvpn/certs/server.crt
key /etc/openvpn/certs/server.key
dh /etc/openvpn/certs/dh.pem

server 10.8.0.0 255.255.255.0                                          #给客户端分配的地址池
ifconfig-pool-persist /etc/openvpn/ipp.txt
push "route 192.168.252.0 255.255.0.0"  # route根据实际情况修改
push "redirect-gateway def1 bypass-dhcp"                       #客户端网关使用openvpn服务器网关
push "dhcp-option DNS 8.8.8.8"               #指定dns
push "dhcp-option DNS 114.114.114.114"
client-to-client

keepalive 10 120                                                                #心跳检测，10秒检测一次，2分钟内没有回应则视为断线
#tls-auth ta.key 0                                                                  #服务端值为0，客户端为1
cipher AES-256-CBC
comp-lzo
                                                                      #传输数据压缩
persist-key
persist-tun
status openvpn-status.log
log-append  openvpn.log
verb 3
mute 20

开启IP转发

$ vim /etc/sysctl.conf
# 添加：
net.ipv4.ip_forward=1

# 生效
$ sysctl -p

iptables设置

$ iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j MASQUERADE
$ iptables-save > /etc/openvpn-rule
$ cd /etc/
$ iptables-restore < openvpn-rule

启动openvpn

$ systemctl start openvpn@server
$ systemctl enable openvpn@server

客户端准备

客户端连接工具

可能有的涉及到科学上网或者国外网速下载很慢，下面提供我的对象存储下载链接：

客户端.ovpn文件制作

（这里使用把证书内容写入.ovpn里面，当然在配置文件中写入路径也没问题）

  • 客户端所需要的证书路径如下
ll /etc/openvpn/client/eicas/
---
total 16
-rw------- 1 root root 1147 Feb 11 10:08 ca.crt
-rw------- 1 root root 4403 Feb 11 10:08 eicas.crt
-rw------- 1 root root 1708 Feb 11 10:09 eicas.key
  • 本地编辑client.ovpn
client
proto tcp
dev tun
remote xxx.xxx.xxx.xxx 1194 # 服务端公网IP，默认端口是1194

# 此处[inline]也可以写下载下来本地的客户端各个证书的路径
ca [inline] 
cert [inline]
key [inline]

resolv-retry infinite
nobind
mute-replay-warnings

keepalive 20 120
comp-lzo
#user openvpn
#group openvpn

persist-key
persist-tun
status openvpn-status.log
log-append openvpn.log
verb 3
mute 20

<ca>
ca证书的内容粘贴此处
</ca>

<cert>
crt证书内容粘贴此处
</cert>

<key>
秘钥内容粘贴此处
</key>

openvpn gui使用

  • 直接打开软件，导入上述写的.ovpn文件即可，成功的话，会有提示
  • mac的那个也是导入就行了，具体还是不会可以百度一下

账号密码设置

开启服务端账号密码登录配置

  • 编辑服务端server.conf文件
$ vim /etc/openvpn/server.conf
# 添加如下内容
# use username and password login
script-security 3
auth-user-pass-verify /etc/openvpn/checkpsw.sh via-env
client-cert-not-required
username-as-common-name
  • 添加密码检查脚本checkpsw.sh
$ vim /etc/openvpn/checkpsw.sh
---
#!/bin/sh
###########################################################
#
# This script will authenticate OpenVPN users against
# a plain text file. The passfile should simply contain
# one row per user with the username first followed by
# one or more space(s) or tab(s) and then the password.
PASSFILE="/etc/openvpn/psw-file" # 账号密码的路径
LOG_FILE="/etc/openvpn/openvpn-password.log" # 账号密码的日志
TIME_STAMP=`date "+%Y-%m-%d %T"`
###########################################################
if [ ! -r "${PASSFILE}" ]; then
  echo "${TIME_STAMP}: Could not open password file \"${PASSFILE}\" for reading." >> ${LOG_FILE}
  exit 1
fi
CORRECT_PASSWORD=`awk '!/^;/&&!/^#/&&$1=="'${username}'"{print $2;exit}' ${PASSFILE}`
if [ "${CORRECT_PASSWORD}" = "" ]; then
  echo "${TIME_STAMP}: User does not exist: username=\"${username}\", password=\"${password}\"." >> ${LOG_FILE}
  exit 1
fi
if [ "${password}" = "${CORRECT_PASSWORD}" ]; then
  echo "${TIME_STAMP}: Successful authentication: username=\"${username}\"." >> ${LOG_FILE}
  exit 0
fi
echo "${TIME_STAMP}: Incorrect password: username=\"${username}\", password=\"${password}\"." >> ${LOG_FILE}
exit 1
  • 添加账号密码
$ vim /etc/openvpn/psw-file
# 账号+空格+密码的形式，例如：

test 123456
  • 重启openvpn
systemctl restart openvpn@server

设置客户端.ovpn密码账号登录内容

  • 编辑之前创建的client.ovpn文件，添加一行：
auth-user-pass
  • 完整如下
client
proto tcp
dev tun
remote xxx.xxx.xxx.xxx 1194 # 服务端公网IP，默认端口是1194

# 此处[inline]也可以写下载下来本地的客户端各个证书的路径
ca [inline] 
cert [inline]
key [inline]

resolv-retry infinite
nobind
mute-replay-warnings

keepalive 20 120
comp-lzo
#user openvpn
#group openvpn

persist-key
persist-tun
status openvpn-status.log
log-append openvpn.log
verb 3
auth-user-pass
mute 20

<ca>
ca证书的内容粘贴此处
</ca>
crt证书内容粘贴此处
<cert>

</cert>

<key>
秘钥内容粘贴此处
</key>

之后重新连接即可

Windows 10运行成功效果图

自动化安装脚本

  • 支持自动化安装、自动化生成客户端配置文件
  • 支持新增客户端配置文件
  • 支持移除客户端配置文件
  • 支持卸载服务端
  • 不支持多用户支持（可自行修改程序实现）
#!/bin/bash


# Detect Debian users running the script with "sh" instead of bash
if readlink /proc/$$/exe | grep -q "dash"; then
	echo 'This installer needs to be run with "bash", not "sh".'
	exit
fi

# Discard stdin. Needed when running from an one-liner which includes a newline
read -N 999999 -t 0.001

# Detect OpenVZ 6
if [[ $(uname -r | cut -d "." -f 1) -eq 2 ]]; then
	echo "The system is running an old kernel, which is incompatible with this installer."
	exit
fi

# Detect OS
# $os_version variables aren't always in use, but are kept here for convenience
if grep -qs "ubuntu" /etc/os-release; then
	os="ubuntu"
	os_version=$(grep 'VERSION_ID' /etc/os-release | cut -d '"' -f 2 | tr -d '.')
	group_name="nogroup"
elif [[ -e /etc/debian_version ]]; then
	os="debian"
	os_version=$(grep -oE '[0-9]+' /etc/debian_version | head -1)
	group_name="nogroup"
elif [[ -e /etc/centos-release ]]; then
	os="centos"
	os_version=$(grep -oE '[0-9]+' /etc/centos-release | head -1)
	group_name="nobody"
elif [[ -e /etc/fedora-release ]]; then
	os="fedora"
	os_version=$(grep -oE '[0-9]+' /etc/fedora-release | head -1)
	group_name="nobody"
else
	echo "This installer seems to be running on an unsupported distribution.
Supported distributions are Ubuntu, Debian, CentOS, and Fedora."
	exit
fi

if [[ "$os" == "ubuntu" && "$os_version" -lt 1804 ]]; then
	echo "Ubuntu 18.04 or higher is required to use this installer.
This version of Ubuntu is too old and unsupported."
	exit
fi

if [[ "$os" == "debian" && "$os_version" -lt 9 ]]; then
	echo "Debian 9 or higher is required to use this installer.
This version of Debian is too old and unsupported."
	exit
fi

if [[ "$os" == "centos" && "$os_version" -lt 7 ]]; then
	echo "CentOS 7 or higher is required to use this installer.
This version of CentOS is too old and unsupported."
	exit
fi

# Detect environments where $PATH does not include the sbin directories
if ! grep -q sbin <<< "$PATH"; then
	echo '$PATH does not include sbin. Try using "su -" instead of "su".'
	exit
fi

if [[ "$EUID" -ne 0 ]]; then
	echo "This installer needs to be run with superuser privileges."
	exit
fi

if [[ ! -e /dev/net/tun ]] || ! ( exec 7<>/dev/net/tun ) 2>/dev/null; then
	echo "The system does not have the TUN device available.
TUN needs to be enabled before running this installer."
	exit
fi

new_client () {
	# Generates the custom client.ovpn
	{
	cat /etc/openvpn/server/client-common.txt
	echo "<ca>"
	cat /etc/openvpn/server/easy-rsa/pki/ca.crt
	echo "</ca>"
	echo "<cert>"
	sed -ne '/BEGIN CERTIFICATE/,$ p' /etc/openvpn/server/easy-rsa/pki/issued/"$client".crt
	echo "</cert>"
	echo "<key>"
	cat /etc/openvpn/server/easy-rsa/pki/private/"$client".key
	echo "</key>"
	echo "<tls-crypt>"
	sed -ne '/BEGIN OpenVPN Static key/,$ p' /etc/openvpn/server/tc.key
	echo "</tls-crypt>"
	} > ~/"$client".ovpn
}

if [[ ! -e /etc/openvpn/server/server.conf ]]; then
	clear
	echo 'Welcome to this OpenVPN road warrior installer!'
	# If system has a single IPv4, it is selected automatically. Else, ask the user
	if [[ $(ip -4 addr | grep inet | grep -vEc '127(\.[0-9]{1,3}){3}') -eq 1 ]]; then
		ip=$(ip -4 addr | grep inet | grep -vE '127(\.[0-9]{1,3}){3}' | cut -d '/' -f 1 | grep -oE '[0-9]{1,3}(\.[0-9]{1,3}){3}')
	else
		number_of_ip=$(ip -4 addr | grep inet | grep -vEc '127(\.[0-9]{1,3}){3}')
		echo
		echo "Which IPv4 address should be used?"
		ip -4 addr | grep inet | grep -vE '127(\.[0-9]{1,3}){3}' | cut -d '/' -f 1 | grep -oE '[0-9]{1,3}(\.[0-9]{1,3}){3}' | nl -s ') '
		read -p "IPv4 address [1]: " ip_number
		until [[ -z "$ip_number" || "$ip_number" =~ ^[0-9]+$ && "$ip_number" -le "$number_of_ip" ]]; do
			echo "$ip_number: invalid selection."
			read -p "IPv4 address [1]: " ip_number
		done
		[[ -z "$ip_number" ]] && ip_number="1"
		ip=$(ip -4 addr | grep inet | grep -vE '127(\.[0-9]{1,3}){3}' | cut -d '/' -f 1 | grep -oE '[0-9]{1,3}(\.[0-9]{1,3}){3}' | sed -n "$ip_number"p)
	fi
	# If $ip is a private IP address, the server must be behind NAT
	if echo "$ip" | grep -qE '^(10\.|172\.1[6789]\.|172\.2[0-9]\.|172\.3[01]\.|192\.168)'; then
		echo
		echo "This server is behind NAT. What is the public IPv4 address or hostname?"
		# Get public IP and sanitize with grep
		get_public_ip=$(grep -m 1 -oE '^[0-9]{1,3}(\.[0-9]{1,3}){3}$' <<< "$(wget -T 10 -t 1 -4qO- "http://ip1.dynupdate.no-ip.com/" || curl -m 10 -4Ls "http://ip1.dynupdate.no-ip.com/")")
		read -p "Public IPv4 address / hostname [$get_public_ip]: " public_ip
		# If the checkip service is unavailable and user didn't provide input, ask again
		until [[ -n "$get_public_ip" || -n "$public_ip" ]]; do
			echo "Invalid input."
			read -p "Public IPv4 address / hostname: " public_ip
		done
		[[ -z "$public_ip" ]] && public_ip="$get_public_ip"
	fi
	# If system has a single IPv6, it is selected automatically
	if [[ $(ip -6 addr | grep -c 'inet6 [23]') -eq 1 ]]; then
		ip6=$(ip -6 addr | grep 'inet6 [23]' | cut -d '/' -f 1 | grep -oE '([0-9a-fA-F]{0,4}:){1,7}[0-9a-fA-F]{0,4}')
	fi
	# If system has multiple IPv6, ask the user to select one
	if [[ $(ip -6 addr | grep -c 'inet6 [23]') -gt 1 ]]; then
		number_of_ip6=$(ip -6 addr | grep -c 'inet6 [23]')
		echo
		echo "Which IPv6 address should be used?"
		ip -6 addr | grep 'inet6 [23]' | cut -d '/' -f 1 | grep -oE '([0-9a-fA-F]{0,4}:){1,7}[0-9a-fA-F]{0,4}' | nl -s ') '
		read -p "IPv6 address [1]: " ip6_number
		until [[ -z "$ip6_number" || "$ip6_number" =~ ^[0-9]+$ && "$ip6_number" -le "$number_of_ip6" ]]; do
			echo "$ip6_number: invalid selection."
			read -p "IPv6 address [1]: " ip6_number
		done
		[[ -z "$ip6_number" ]] && ip6_number="1"
		ip6=$(ip -6 addr | grep 'inet6 [23]' | cut -d '/' -f 1 | grep -oE '([0-9a-fA-F]{0,4}:){1,7}[0-9a-fA-F]{0,4}' | sed -n "$ip6_number"p)
	fi
	echo
	echo "Which protocol should OpenVPN use?"
	echo "   1) UDP (recommended)"
	echo "   2) TCP"
	read -p "Protocol [1]: " protocol
	until [[ -z "$protocol" || "$protocol" =~ ^[12]$ ]]; do
		echo "$protocol: invalid selection."
		read -p "Protocol [1]: " protocol
	done
	case "$protocol" in
		1|"") 
		protocol=udp
		;;
		2) 
		protocol=tcp
		;;
	esac
	echo
	echo "What port should OpenVPN listen to?"
	read -p "Port [1194]: " port
	until [[ -z "$port" || "$port" =~ ^[0-9]+$ && "$port" -le 65535 ]]; do
		echo "$port: invalid port."
		read -p "Port [1194]: " port
	done
	[[ -z "$port" ]] && port="1194"
	echo
	echo "Select a DNS server for the clients:"
	echo "   1) Current system resolvers"
	echo "   2) Google"
	echo "   3) 1.1.1.1"
	echo "   4) OpenDNS"
	echo "   5) Quad9"
	echo "   6) AdGuard"
	read -p "DNS server [1]: " dns
	until [[ -z "$dns" || "$dns" =~ ^[1-6]$ ]]; do
		echo "$dns: invalid selection."
		read -p "DNS server [1]: " dns
	done
	echo
	echo "Enter a name for the first client:"
	read -p "Name [client]: " unsanitized_client
	# Allow a limited set of characters to avoid conflicts
	client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' <<< "$unsanitized_client")
	[[ -z "$client" ]] && client="client"
	echo
	echo "OpenVPN installation is ready to begin."
	# Install a firewall in the rare case where one is not already available
	if ! systemctl is-active --quiet firewalld.service && ! hash iptables 2>/dev/null; then
		if [[ "$os" == "centos" || "$os" == "fedora" ]]; then
			firewall="firewalld"
			# We don't want to silently enable firewalld, so we give a subtle warning
			# If the user continues, firewalld will be installed and enabled during setup
			echo "firewalld, which is required to manage routing tables, will also be installed."
		elif [[ "$os" == "debian" || "$os" == "ubuntu" ]]; then
			# iptables is way less invasive than firewalld so no warning is given
			firewall="iptables"
		fi
	fi
	read -n1 -r -p "Press any key to continue..."
	# If running inside a container, disable LimitNPROC to prevent conflicts
	if systemd-detect-virt -cq; then
		mkdir /etc/systemd/system/openvpn-server@server.service.d/ 2>/dev/null
		echo "[Service]
LimitNPROC=infinity" > /etc/systemd/system/openvpn-server@server.service.d/disable-limitnproc.conf
	fi
	if [[ "$os" = "debian" || "$os" = "ubuntu" ]]; then
		apt-get update
		apt-get install -y openvpn openssl ca-certificates $firewall
	elif [[ "$os" = "centos" ]]; then
		yum install -y epel-release
		yum install -y openvpn openssl ca-certificates tar $firewall
	else
		# Else, OS must be Fedora
		dnf install -y openvpn openssl ca-certificates tar $firewall
	fi
	# If firewalld was just installed, enable it
	if [[ "$firewall" == "firewalld" ]]; then
		systemctl enable --now firewalld.service
	fi
	# Get easy-rsa
	easy_rsa_url='https://github.com/OpenVPN/easy-rsa/releases/download/v3.0.8/EasyRSA-3.0.8.tgz'
	mkdir -p /etc/openvpn/server/easy-rsa/
	{ wget -qO- "$easy_rsa_url" 2>/dev/null || curl -sL "$easy_rsa_url" ; } | tar xz -C /etc/openvpn/server/easy-rsa/ --strip-components 1
	chown -R root:root /etc/openvpn/server/easy-rsa/
	cd /etc/openvpn/server/easy-rsa/
	# Create the PKI, set up the CA and the server and client certificates
	./easyrsa init-pki
	./easyrsa --batch build-ca nopass
	EASYRSA_CERT_EXPIRE=3650 ./easyrsa build-server-full server nopass
	EASYRSA_CERT_EXPIRE=3650 ./easyrsa build-client-full "$client" nopass
	EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
	# Move the stuff we need
	cp pki/ca.crt pki/private/ca.key pki/issued/server.crt pki/private/server.key pki/crl.pem /etc/openvpn/server
	# CRL is read with each client connection, while OpenVPN is dropped to nobody
	chown nobody:"$group_name" /etc/openvpn/server/crl.pem
	# Without +x in the directory, OpenVPN can't run a stat() on the CRL file
	chmod o+x /etc/openvpn/server/
	# Generate key for tls-crypt
	openvpn --genkey --secret /etc/openvpn/server/tc.key
	# Create the DH parameters file using the predefined ffdhe2048 group
	echo '-----BEGIN DH PARAMETERS-----
MIIBCAKCAQEA//////////+t+FRYortKmq/cViAnPTzx2LnFg84tNpWp4TZBFGQz
+8yTnc4kmz75fS/jY2MMddj2gbICrsRhetPfHtXV/WVhJDP1H18GbtCFY2VVPe0a
87VXE15/V8k1mE8McODmi3fipona8+/och3xWKE2rec1MKzKT0g6eXq8CrGCsyT7
YdEIqUuyyOP7uWrat2DX9GgdT0Kj3jlN9K5W7edjcrsZCwenyO4KbXCeAvzhzffi
7MA0BM0oNC9hkXL+nOmFg/+OTxIy7vKBg8P+OxtMb61zO7X8vC7CIAXFjvGDfRaD
ssbzSibBsu/6iGtCOGEoXJf//////////wIBAg==
-----END DH PARAMETERS-----' > /etc/openvpn/server/dh.pem
	# Generate server.conf
	echo "local $ip
port $port
proto $protocol
dev tun
ca ca.crt
cert server.crt
key server.key
dh dh.pem
auth SHA512
tls-crypt tc.key
topology subnet
server 10.8.0.0 255.255.255.0" > /etc/openvpn/server/server.conf
	# IPv6
	if [[ -z "$ip6" ]]; then
		echo 'push "redirect-gateway def1 bypass-dhcp"' >> /etc/openvpn/server/server.conf
	else
		echo 'server-ipv6 fddd:1194:1194:1194::/64' >> /etc/openvpn/server/server.conf
		echo 'push "redirect-gateway def1 ipv6 bypass-dhcp"' >> /etc/openvpn/server/server.conf
	fi
	echo 'ifconfig-pool-persist ipp.txt' >> /etc/openvpn/server/server.conf
	# DNS
	case "$dns" in
		1|"")
			# Locate the proper resolv.conf
			# Needed for systems running systemd-resolved
			if grep -q '^nameserver 127.0.0.53' "/etc/resolv.conf"; then
				resolv_conf="/run/systemd/resolve/resolv.conf"
			else
				resolv_conf="/etc/resolv.conf"
			fi
			# Obtain the resolvers from resolv.conf and use them for OpenVPN
			grep -v '^#\|^;' "$resolv_conf" | grep '^nameserver' | grep -oE '[0-9]{1,3}(\.[0-9]{1,3}){3}' | while read line; do
				echo "push \"dhcp-option DNS $line\"" >> /etc/openvpn/server/server.conf
			done
		;;
		2)
			echo 'push "dhcp-option DNS 8.8.8.8"' >> /etc/openvpn/server/server.conf
			echo 'push "dhcp-option DNS 8.8.4.4"' >> /etc/openvpn/server/server.conf
		;;
		3)
			echo 'push "dhcp-option DNS 1.1.1.1"' >> /etc/openvpn/server/server.conf
			echo 'push "dhcp-option DNS 1.0.0.1"' >> /etc/openvpn/server/server.conf
		;;
		4)
			echo 'push "dhcp-option DNS 208.67.222.222"' >> /etc/openvpn/server/server.conf
			echo 'push "dhcp-option DNS 208.67.220.220"' >> /etc/openvpn/server/server.conf
		;;
		5)
			echo 'push "dhcp-option DNS 9.9.9.9"' >> /etc/openvpn/server/server.conf
			echo 'push "dhcp-option DNS 149.112.112.112"' >> /etc/openvpn/server/server.conf
		;;
		6)
			echo 'push "dhcp-option DNS 94.140.14.14"' >> /etc/openvpn/server/server.conf
			echo 'push "dhcp-option DNS 94.140.15.15"' >> /etc/openvpn/server/server.conf
		;;
	esac
	echo "keepalive 10 120
cipher AES-256-CBC
user nobody
group $group_name
persist-key
persist-tun
verb 3
crl-verify crl.pem" >> /etc/openvpn/server/server.conf
	if [[ "$protocol" = "udp" ]]; then
		echo "explicit-exit-notify" >> /etc/openvpn/server/server.conf
	fi
	# Enable net.ipv4.ip_forward for the system
	echo 'net.ipv4.ip_forward=1' > /etc/sysctl.d/30-openvpn-forward.conf
	# Enable without waiting for a reboot or service restart
	echo 1 > /proc/sys/net/ipv4/ip_forward
	if [[ -n "$ip6" ]]; then
		# Enable net.ipv6.conf.all.forwarding for the system
		echo "net.ipv6.conf.all.forwarding=1" >> /etc/sysctl.d/30-openvpn-forward.conf
		# Enable without waiting for a reboot or service restart
		echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
	fi
	if systemctl is-active --quiet firewalld.service; then
		# Using both permanent and not permanent rules to avoid a firewalld
		# reload.
		# We don't use --add-service=openvpn because that would only work with
		# the default port and protocol.
		firewall-cmd --add-port="$port"/"$protocol"
		firewall-cmd --zone=trusted --add-source=10.8.0.0/24
		firewall-cmd --permanent --add-port="$port"/"$protocol"
		firewall-cmd --permanent --zone=trusted --add-source=10.8.0.0/24
		# Set NAT for the VPN subnet
		firewall-cmd --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to "$ip"
		firewall-cmd --permanent --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to "$ip"
		if [[ -n "$ip6" ]]; then
			firewall-cmd --zone=trusted --add-source=fddd:1194:1194:1194::/64
			firewall-cmd --permanent --zone=trusted --add-source=fddd:1194:1194:1194::/64
			firewall-cmd --direct --add-rule ipv6 nat POSTROUTING 0 -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to "$ip6"
			firewall-cmd --permanent --direct --add-rule ipv6 nat POSTROUTING 0 -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to "$ip6"
		fi
	else
		# Create a service to set up persistent iptables rules
		iptables_path=$(command -v iptables)
		ip6tables_path=$(command -v ip6tables)
		# nf_tables is not available as standard in OVZ kernels. So use iptables-legacy
		# if we are in OVZ, with a nf_tables backend and iptables-legacy is available.
		if [[ $(systemd-detect-virt) == "openvz" ]] && readlink -f "$(command -v iptables)" | grep -q "nft" && hash iptables-legacy 2>/dev/null; then
			iptables_path=$(command -v iptables-legacy)
			ip6tables_path=$(command -v ip6tables-legacy)
		fi
		echo "[Unit]
Before=network.target
[Service]
Type=oneshot
ExecStart=$iptables_path -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $ip
ExecStart=$iptables_path -I INPUT -p $protocol --dport $port -j ACCEPT
ExecStart=$iptables_path -I FORWARD -s 10.8.0.0/24 -j ACCEPT
ExecStart=$iptables_path -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
ExecStop=$iptables_path -t nat -D POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $ip
ExecStop=$iptables_path -D INPUT -p $protocol --dport $port -j ACCEPT
ExecStop=$iptables_path -D FORWARD -s 10.8.0.0/24 -j ACCEPT
ExecStop=$iptables_path -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT" > /etc/systemd/system/openvpn-iptables.service
		if [[ -n "$ip6" ]]; then
			echo "ExecStart=$ip6tables_path -t nat -A POSTROUTING -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to $ip6
ExecStart=$ip6tables_path -I FORWARD -s fddd:1194:1194:1194::/64 -j ACCEPT
ExecStart=$ip6tables_path -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
ExecStop=$ip6tables_path -t nat -D POSTROUTING -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to $ip6
ExecStop=$ip6tables_path -D FORWARD -s fddd:1194:1194:1194::/64 -j ACCEPT
ExecStop=$ip6tables_path -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT" >> /etc/systemd/system/openvpn-iptables.service
		fi
		echo "RemainAfterExit=yes
[Install]
WantedBy=multi-user.target" >> /etc/systemd/system/openvpn-iptables.service
		systemctl enable --now openvpn-iptables.service
	fi
	# If SELinux is enabled and a custom port was selected, we need this
	if sestatus 2>/dev/null | grep "Current mode" | grep -q "enforcing" && [[ "$port" != 1194 ]]; then
		# Install semanage if not already present
		if ! hash semanage 2>/dev/null; then
			if [[ "$os_version" -eq 7 ]]; then
				# Centos 7
				yum install -y policycoreutils-python
			else
				# CentOS 8 or Fedora
				dnf install -y policycoreutils-python-utils
			fi
		fi
		semanage port -a -t openvpn_port_t -p "$protocol" "$port"
	fi
	# If the server is behind NAT, use the correct IP address
	[[ -n "$public_ip" ]] && ip="$public_ip"
	# client-common.txt is created so we have a template to add further users later
	echo "client
dev tun
proto $protocol
remote $ip $port
resolv-retry infinite
nobind
persist-key
persist-tun
remote-cert-tls server
auth SHA512
cipher AES-256-CBC
ignore-unknown-option block-outside-dns
block-outside-dns
verb 3" > /etc/openvpn/server/client-common.txt
	# Enable and start the OpenVPN service
	systemctl enable --now openvpn-server@server.service
	# Generates the custom client.ovpn
	new_client
	echo
	echo "Finished!"
	echo
	echo "The client configuration is available in:" ~/"$client.ovpn"
	echo "New clients can be added by running this script again."
else
	clear
	echo "OpenVPN is already installed."
	echo
	echo "Select an option:"
	echo "   1) Add a new client"
	echo "   2) Revoke an existing client"
	echo "   3) Remove OpenVPN"
	echo "   4) Exit"
	read -p "Option: " option
	until [[ "$option" =~ ^[1-4]$ ]]; do
		echo "$option: invalid selection."
		read -p "Option: " option
	done
	case "$option" in
		1)
			echo
			echo "Provide a name for the client:"
			read -p "Name: " unsanitized_client
			client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' <<< "$unsanitized_client")
			while [[ -z "$client" || -e /etc/openvpn/server/easy-rsa/pki/issued/"$client".crt ]]; do
				echo "$client: invalid name."
				read -p "Name: " unsanitized_client
				client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' <<< "$unsanitized_client")
			done
			cd /etc/openvpn/server/easy-rsa/
			EASYRSA_CERT_EXPIRE=3650 ./easyrsa build-client-full "$client" nopass
			# Generates the custom client.ovpn
			new_client
			echo
			echo "$client added. Configuration available in:" ~/"$client.ovpn"
			exit
		;;
		2)
			# This option could be documented a bit better and maybe even be simplified
			# ...but what can I say, I want some sleep too
			number_of_clients=$(tail -n +2 /etc/openvpn/server/easy-rsa/pki/index.txt | grep -c "^V")
			if [[ "$number_of_clients" = 0 ]]; then
				echo
				echo "There are no existing clients!"
				exit
			fi
			echo
			echo "Select the client to revoke:"
			tail -n +2 /etc/openvpn/server/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | nl -s ') '
			read -p "Client: " client_number
			until [[ "$client_number" =~ ^[0-9]+$ && "$client_number" -le "$number_of_clients" ]]; do
				echo "$client_number: invalid selection."
				read -p "Client: " client_number
			done
			client=$(tail -n +2 /etc/openvpn/server/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | sed -n "$client_number"p)
			echo
			read -p "Confirm $client revocation? [y/N]: " revoke
			until [[ "$revoke" =~ ^[yYnN]*$ ]]; do
				echo "$revoke: invalid selection."
				read -p "Confirm $client revocation? [y/N]: " revoke
			done
			if [[ "$revoke" =~ ^[yY]$ ]]; then
				cd /etc/openvpn/server/easy-rsa/
				./easyrsa --batch revoke "$client"
				EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
				rm -f /etc/openvpn/server/crl.pem
				cp /etc/openvpn/server/easy-rsa/pki/crl.pem /etc/openvpn/server/crl.pem
				# CRL is read with each client connection, when OpenVPN is dropped to nobody
				chown nobody:"$group_name" /etc/openvpn/server/crl.pem
				echo
				echo "$client revoked!"
			else
				echo
				echo "$client revocation aborted!"
			fi
			exit
		;;
		3)
			echo
			read -p "Confirm OpenVPN removal? [y/N]: " remove
			until [[ "$remove" =~ ^[yYnN]*$ ]]; do
				echo "$remove: invalid selection."
				read -p "Confirm OpenVPN removal? [y/N]: " remove
			done
			if [[ "$remove" =~ ^[yY]$ ]]; then
				port=$(grep '^port ' /etc/openvpn/server/server.conf | cut -d " " -f 2)
				protocol=$(grep '^proto ' /etc/openvpn/server/server.conf | cut -d " " -f 2)
				if systemctl is-active --quiet firewalld.service; then
					ip=$(firewall-cmd --direct --get-rules ipv4 nat POSTROUTING | grep '\-s 10.8.0.0/24 '"'"'!'"'"' -d 10.8.0.0/24' | grep -oE '[^ ]+$')
					# Using both permanent and not permanent rules to avoid a firewalld reload.
					firewall-cmd --remove-port="$port"/"$protocol"
					firewall-cmd --zone=trusted --remove-source=10.8.0.0/24
					firewall-cmd --permanent --remove-port="$port"/"$protocol"
					firewall-cmd --permanent --zone=trusted --remove-source=10.8.0.0/24
					firewall-cmd --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to "$ip"
					firewall-cmd --permanent --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to "$ip"
					if grep -qs "server-ipv6" /etc/openvpn/server/server.conf; then
						ip6=$(firewall-cmd --direct --get-rules ipv6 nat POSTROUTING | grep '\-s fddd:1194:1194:1194::/64 '"'"'!'"'"' -d fddd:1194:1194:1194::/64' | grep -oE '[^ ]+$')
						firewall-cmd --zone=trusted --remove-source=fddd:1194:1194:1194::/64
						firewall-cmd --permanent --zone=trusted --remove-source=fddd:1194:1194:1194::/64
						firewall-cmd --direct --remove-rule ipv6 nat POSTROUTING 0 -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to "$ip6"
						firewall-cmd --permanent --direct --remove-rule ipv6 nat POSTROUTING 0 -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to "$ip6"
					fi
				else
					systemctl disable --now openvpn-iptables.service
					rm -f /etc/systemd/system/openvpn-iptables.service
				fi
				if sestatus 2>/dev/null | grep "Current mode" | grep -q "enforcing" && [[ "$port" != 1194 ]]; then
					semanage port -d -t openvpn_port_t -p "$protocol" "$port"
				fi
				systemctl disable --now openvpn-server@server.service
				rm -rf /etc/openvpn/server
				rm -f /etc/systemd/system/openvpn-server@server.service.d/disable-limitnproc.conf
				rm -f /etc/sysctl.d/30-openvpn-forward.conf
				if [[ "$os" = "debian" || "$os" = "ubuntu" ]]; then
					apt-get remove --purge -y openvpn
				else
					# Else, OS must be CentOS or Fedora
					yum remove -y openvpn
				fi
				echo
				echo "OpenVPN removed!"
			else
				echo
				echo "OpenVPN removal aborted!"
			fi
			exit
		;;
		4)
			exit
		;;
	esac
fi

本文作者为olei，转载请注明。

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表情 图片 链接 代码

  1. 凌一
    凌一 Lv 1

    一gi我里giao giao，最新版还能Android连接吗，好久没玩这个了。

    沙发 2020-04-22 09:41 回复
    • olei
      olei 站长

      @凌一可以呀，这个只是一个内网vpn而已，并非科学上网哦

      2020-04-22 11:01 回复
      • 陈anz
        陈anz Lv 1

        @olei不错 加qq了 开源精神 不错 好兄弟~

        2020-09-20 02:52 回复
  2. 老猫
    老猫 Lv 1

    你有没有遇到tap windows 数字签名的问题啊？因为数字签名不对，导致tap-windows无法正常工作。

    板凳 2020-05-12 11:21 回复
  3. 34
    34 Lv 1

    谢谢大佬

    地板 2020-08-19 14:12 回复
  4. 今日新闻头条
    今日新闻头条 Lv 1

    文章不错支持一下

    #4 2021-03-25 16:43 回复
  5. 站元素主机
    站元素主机 Lv 1

    感谢分享 赞一个

    #5 2021-04-07 11:09 回复
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