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openvpn/Centos中openvpn安装配置文档.md

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+***<font color="#FF0000">该文档使用openvpn路由模式</font><br />***
+### 系统及角色
+|角色|系统及版本|
+|:---:|:---:|
+|服务器端|CentOS 8|
+|客户端|Windows 10|
+
+### 软件及版本
+|软件|版本|
+|:---:|:---:|
+|openvpn|2.4.10|
+|easy-rsa|3.0.8|
+
+## 安装必要软件
+```bash
+yum install -y epel-release
+yum update -y
+yum install -y openssl openssl-devel lzo lzo-devel pam pam-devel 
+```
+
+## 安装openvpn和easy-rsa
+```bash
+yum install -y openvpn easy-rsa
+```
+
+## 确定私有子网
+*Server与Client的CVPN通信子网，不与现有网络冲突* 
+默认: 10.8.0.0/16
+
+## 配置证书密钥
+*3.x版本easy-rsa配置过程如下*
+```bash
+cp -rf /usr/share/easy-rsa/3.0.8 /etc/openvpn/easy-rsa
+cd /etc/openvpn/easy-rsa
+## 初始化证书生成环境
+./easyrsa init-pki
+## 无密码生成ca证书与私钥，需要填写cn
+./easyrsa build-ca nopass
+## 生成server证书与私钥
+./easyrsa build-server-full server nopass
+## 生成client证书与私钥
+./easyrsa build-client-full client1 nopass
+./easyrsa build-client-full client2 nopass
+## 生成dh.pem(可能需要几分钟)
+./easyrsa gen-dh
+## 生成ta.key
+openvpn --genkey --secret ta.key
+```
+
+*2.x版本easy-rsa配置过程如下*
+```bash
+. ./vars
+./clean-all
+./build-ca
+./build-key-server server
+./build-key client1
+./build-key client2
+./build-dh
+openvpn --genkey --secret ta.key
+```
+
+## 配置Server端
+### 创建必要目录
+```bash
+# 日志存放目录
+mkdir -p /var/log/openvpn/
+# 用户管理目录
+mkdir -p /etc/openvpn/server/user
+# 配置权限
+chown openvpn:openvpn /var/log/openvpn
+```
+
+### 创建Server配置文件
+*编辑/etc/openvpn/server/server.conf*
+```bash
+#################################################
+# This file is for the server side              #
+# of a many-clients <-> one-server              #
+# OpenVPN configuration.                        #
+#                                               #
+# Comments are preceded with '#' or ';'         #
+#################################################
+port 30003
+proto tcp-server
+## Enable the management interface
+# management-client-auth
+# management localhost 7505 /etc/openvpn/user/management-file
+dev tun     # TUN/TAP virtual network device
+user openvpn
+group openvpn
+ca /etc/openvpn/easy-rsa/pki/ca.crt
+cert /etc/openvpn/easy-rsa/pki/issued/server.crt
+key /etc/openvpn/easy-rsa/pki/private/server.key
+dh /etc/openvpn/easy-rsa/pki/dh.pem
+tls-auth /etc/openvpn/easy-rsa/ta.key 0
+## Using System user auth.
+# plugin /usr/lib64/openvpn/plugins/openvpn-plugin-auth-pam.so login
+## Using Script Plugins
+auth-user-pass-verify /etc/openvpn/server/user/checkpsw.sh via-env
+script-security 3
+# client-cert-not-required  # Deprecated option
+verify-client-cert
+username-as-common-name
+## Connecting clients to be able to reach each other over the VPN.
+client-to-client
+## Allow multiple clients with the same common name to concurrently connect.
+duplicate-cn
+# client-config-dir /etc/openvpn/server/ccd
+# ifconfig-pool-persist ipp.txt
+server 10.8.8.0 255.255.255.0
+push "dhcp-option DNS 114.114.114.114"
+push "dhcp-option DNS 1.1.1.1"
+push "route 172.19.0.0 255.255.0.0"
+
+ifconfig-pool-persist ipp.txt
+# comp-lzo - DEPRECATED This option will be removed in a future OpenVPN release. Use the newer --compress instead.
+compress lzo
+push "compress lzo"
+# cipher AES-256-CBC
+ncp-ciphers "AES-256-GCM:AES-128-GCM"
+## In UDP client mode or point-to-point mode, send server/peer an exit notification if tunnel is restarted or OpenVPN process is exited.
+# explicit-exit-notify 1
+keepalive 10 120
+persist-key
+persist-tun
+verb 3
+
+log /var/log/openvpn/server.log
+log-append /var/log/openvpn/server.log
+status /var/log/openvpn/status.log
+```
+创建软链接
+***当前版本的openvpnsystem启动文件读取的配置文件为.service.conf***
+```
+cd /etc/openvpn/server
+ln -sf server.conf .service.conf
+```
+
+其中，checkpsw.sh文件(***检查密码脚本***)内容如下：
+*/etc/openvpn/server/user/checkpsw.sh*
+```bash
+#!/bin/sh
+###########################################################
+# checkpsw.sh (C) 2004 Mathias Sundman <mathias@openvpn.se>
+#
+# 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/server/user/psw-file"
+LOG_FILE="/var/log/openvpn/password.log"
+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
+```
+需要创建用户密码文件
+*/etc/openvpn/server/user/psw-file*
+```bash
+# 格式如下
+# username password
+opm probe.cc
+```
+为psw-file配置权限
+```bash
+chmod 600 /etc/openvpn/server/user/psw-file
+chown openvpn:openvpn /etc/openvpn/server/user/psw-file
+```
+ipp.txt文件内容如下：
+*与server.conf同一目录*
+```bash
+# 格式如下
+# username,ip
+opm,10.8.8.8
+```
+
+### 防火墙配置
+```bash
+firewall-cmd --permanent --add-masquerade
+firewall-cmd --permanent --add-service=openvpn
+# 或者添加自定义端口
+# firewall-cmd --permanent  --add-port=1194/tcp
+firewall-cmd --permanent --direct --passthrough ipv4 -t nat -A POSTROUTING -s 10.8.8.0/24 -o eth0 -j MASQUERADE
+firewall-cmd --reload
+``` 
+
+### 启动服务
+```bash
+# 查看service名称
+rpm -ql openvpn |grep service
+/usr/lib/systemd/system/openvpn-client@.service
+/usr/lib/systemd/system/openvpn-server@.service
+/usr/lib/systemd/system/openvpn@.service
+# 启动
+systemctl start openvpn-server@.service.service
+```
+
+## 安装配置客户端
+### 安装openvpn
+*略*
+## 配置客户端
+***下载ca.crt,client1.crt,client1.key,ta.key到客户端配置文件目录***
+*客户端配置文件client.ovpn文件内容如下*
+```bash
+# 
+client
+proto tcp-client
+dev tun
+auth-user-pass
+# 替换下行中的publicIP为openvpn服务端ip或者域名，端口为服务端配置的端口
+remote publicIP 30003
+# 证书与私钥放在与client.ovpn同一目录下即可
+ca ca.crt
+cert client1.crt
+key client1.key
+tls-auth ta.key 1
+remote-cert-tls server
+auth-nocache
+persist-tun
+persist-key
+compress lzo
+verb 4
+mute 10
+```
+
+## 其他
+客户端配置文件及日志文件路径配置如下
+1、右键点击桌面右下角的![avatar](./images/logo.png)，在弹出的工具栏中先择"选项...",如下图
+![avatar](./images/options.png)
+2、在“OpenVPN - 设置”窗口，点击“高级”，选择配置文件文件夹及日志文件文件夹，如下图
+![avatar](./images/set.png)

openvpn/images/readme.md

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+ttt