OpenVpn配置

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sudo apt install easy-rsa
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mkdir openvpn_config
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cd openvpn_config
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cp -r /usr/share/easy-rsa/
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cd easy-rsa

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cp vars.example vars
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vim vars
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set_var EASYRSA_REQ_COUNTRY	"CN"
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set_var EASYRSA_REQ_PROVINCE	"Guang Dong"
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set_var EASYRSA_REQ_CITY	"Shen Zhen"
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set_var EASYRSA_REQ_ORG	"xxxx"
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set_var EASYRSA_REQ_EMAIL	"xxxxx.com"
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set_var EASYRSA_REQ_OU		"OpenSVN"
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#提高加密等级
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set_var EASYRSA_KEY_SIZE	4096
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#修改时间这里改大，如果需要高等级改小
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set_var EASYRSA_CA_EXPIRE	365000
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#生效时间这里改大，如果需要高等级改小
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set_var EASYRSA_CERT_EXPIRE	3650

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./easyrsa init-pki    #1、初始化，在当前目录创建PKI目录，用于存储整数
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./easyrsa build-ca    #2、创建根证书，会提示设置密码，用于ca对之后生成的server和client证书签名时使用，其他提示内容直接回车即可
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Enter New CA Key Passphrase:         #注意密码不能太短，我这边设置的是123456
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Re-Enter New CA Key Passphrase:
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./easyrsa gen-req server nopass    #3、创建server端证书和私钥文件，nopass表示不加密私钥文件，提示内容直接回车即可
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./easyrsa sign server server    #4、给server端证书签名，提示内容需要输入yes和创建ca根证书时候的密码
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./easyrsa gen-dh    #5、创建Diffie-Hellman文件，密钥交换时的Diffie-Hellman算法
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./easyrsa gen-req client nopass    #6、创建client端的证书和私钥文件，nopass表示不加密私钥文件，提示内容直接回车即可
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./easyrsa sign client client    #7、给client端证书前面，提示内容输入yes和创建ca根证书时候的密码
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tree    #检查是否有ca根证书、客户端服务端证书、客户端服务端私钥
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.
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├── easyrsa                    #管理命令
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├── openssl-easyrsa.cnf
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├── pki
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│   ├── ca.crt                #ca根证书，服务端与客户端都需要用
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│   ├── certs_by_serial
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│   │   ├── 633C217979C7B5F1D0A9ECA971006F96.pem
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│   │   └── 857F9B2E3F6C3D35934672212343B42D.pem
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│   ├── dh.pem                #认证算法 服务端
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│   ├── index.txt
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│   ├── index.txt.attr
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│   ├── index.txt.attr.old
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│   ├── index.txt.old
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│   ├── issued
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│   │   ├── client.crt        #客户端证书
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│   │   └── server.crt        #服务端证书
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│   ├── openssl-easyrsa.cnf
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│   ├── private
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│   │   ├── ca.key
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│   │   ├── client.key        #客户端私钥
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│   │   └── server.key        #服务端私钥
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......

sudo apt install openvpn

cd /etc/openvpn/server
OpenVPN --genkey --secret ./ta.key

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cd /etc/openvpn
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vim server.conf
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port xxxx
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proto tcp
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dev tun
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ca /etc/openvpn/server/ca.crt
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cert /etc/openvpn/server/server.crt
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key /etc/openvpn/server/server.key
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dh /etc/openvpn/server/dh.pem
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server 10.110.0.0 255.255.255.0 #根据需求调整
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ifconfig-pool-persist ./server/ipp.txt 记录调整从机ip文件
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push "redirect-gateway def1 bypass-dhcp"
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push "redirect-gateway ipv6"
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client-to-client #允许从机互相访问
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keepalive 10 120
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tls-crypt ./server/ta.key
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cipher AES-256-GCM
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auth SHA256
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user nobody  #这里可能会引发错误注意看日志
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group nogroup  #这里可能会引发错误注意看日志
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persist-key
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persist-tun
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status openvpn-status.log
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log-append  openvpn.log #调试时打开，否则日志会增大的很厉害
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verb 3
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explicit-exit-notify 0

systemctl start openvpn@server
easy-rsa]# systemctl enable openvpn@server
ip a

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mkdir make_client_file
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cd make_client_file
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vim base.conf
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##############################################
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# Sample client-side OpenVPN 2.0 config file #
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# for connecting to multi-client server.     #
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#                                            #
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# This configuration can be used by multiple #
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# clients, however each client should have   #
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# its own cert and key files.                #
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#                                            #
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# On Windows, you might want to rename this  #
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# file so it has a .ovpn extension           #
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##############################################
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# Specify that we are a client and that we
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# will be pulling certain config file directives
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# from the server.
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client
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# Use the same setting as you are using on
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# the server.
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# On most systems, the VPN will not function
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# unless you partially or fully disable
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# the firewall for the TUN/TAP interface.
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;dev tap
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dev tun
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# Windows needs the TAP-Win32 adapter name
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# from the Network Connections panel
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# if you have more than one.  On XP SP2,
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# you may need to disable the firewall
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# for the TAP adapter.
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;dev-node MyTap
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# Are we connecting to a TCP or
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# UDP server?  Use the same setting as
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# on the server.
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proto tcp
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;proto udp
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# The hostname/IP and port of the server.
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# You can have multiple remote entries
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# to load balance between the servers.
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remote xx.xx.xx.xx xxxxx #公网ip及端口
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;remote my-server-2 1194
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# Choose a random host from the remote
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# list for load-balancing.  Otherwise
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# try hosts in the order specified.
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;remote-random
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# Keep trying indefinitely to resolve the
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# host name of the OpenVPN server.  Very useful
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# on machines which are not permanently connected
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# to the internet such as laptops.
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resolv-retry infinite
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# Most clients don't need to bind to
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# a specific local port number.
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nobind
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# Downgrade privileges after initialization (non-Windows only)
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user nobody
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group nogroup
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# Try to preserve some state across restarts.
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persist-key
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persist-tun
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# If you are connecting through an
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# HTTP proxy to reach the actual OpenVPN
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# server, put the proxy server/IP and
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# port number here.  See the man page
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# if your proxy server requires
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# authentication.
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;http-proxy-retry # retry on connection failures
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;http-proxy [proxy server] [proxy port #]
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# Wireless networks often produce a lot
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# of duplicate packets.  Set this flag
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# to silence duplicate packet warnings.
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;mute-replay-warnings
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# SSL/TLS parms.
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# See the server config file for more
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# description.  It's best to use
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# a separate .crt/.key file pair
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# for each client.  A single ca
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# file can be used for all clients.
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;ca ca.crt
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;cert client.crt
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;key client.key
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# Verify server certificate by checking that the
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# certicate has the correct key usage set.
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# This is an important precaution to protect against
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# a potential attack discussed here:
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#  http://openvpn.net/howto.html#mitm
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#
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# To use this feature, you will need to generate
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# your server certificates with the keyUsage set to
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#   digitalSignature, keyEncipherment
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# and the extendedKeyUsage to
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#   serverAuth
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# EasyRSA can do this for you.
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remote-cert-tls server
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# If a tls-auth key is used on the server
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# then every client must also have the key.
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;tls-auth ta.key 1
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# Select a cryptographic cipher.
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# If the cipher option is used on the server
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# then you must also specify it here.
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# Note that v2.4 client/server will automatically
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# negotiate AES-256-GCM in TLS mode.
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# See also the ncp-cipher option in the manpage
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;cipher AES-256-CBC
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cipher AES-256-GCM
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auth SHA256
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key-direction 1
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;redirect-gateway def1
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route-nopull
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route 10.110.0.0 255.255.0.0 vpn_gateway #和服务器端一样
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# Enable compression on the VPN link.
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# Don't enable this unless it is also
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# enabled in the server config file.
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#comp-lzo
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47.115.60.163
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# Set log file verbosity.
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verb 3
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# Silence repeating messages
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;mute 20

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mkdir key #存储相关key文件
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mkdir files #生成的配置文件
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vim make_config.sh
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#!/bin/bash
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# First argument: Client identifier
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KEY_DIR=./keys
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OUTPUT_DIR=./files
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BASE_CONFIG=./base.conf
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cat ${BASE_CONFIG} \
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<(echo -e '<ca>') \
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${KEY_DIR}/ca.crt \
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<(echo -e '</ca>\n<cert>') \
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${KEY_DIR}/$1.crt \
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<(echo -e '</cert>\n<key>') \
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${KEY_DIR}/$1.key \
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<(echo -e '</key>\n<tls-crypt>') \
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${KEY_DIR}/ta.key \
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<(echo -e '</tls-crypt>') \
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> ${OUTPUT_DIR}/$1.ovpn\
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chmod +x make_config.sh

./make_config.sh client

sudo openvpn --config client.ovpn
ip a #查看ip是否联通tunx