212 lines
8.4 KiB
Markdown
212 lines
8.4 KiB
Markdown
# 如何配置 IKEv2 VPN: Windows 7 和更新版本
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*其他语言版本: [English](ikev2-howto.md), [简体中文](ikev2-howto-zh.md).*
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**重要提示：** 本指南仅适用于**高级用户**。其他用户请使用 <a href="clients-zh.md" target="_blank">IPsec/L2TP</a> 或者 <a href="clients-xauth-zh.md" target="_blank">IPsec/XAuth</a>。
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Windows 7 和更新版本支持 IKEv2 和 MOBIKE 标准，通过 Microsoft 的 Agile VPN 功能来实现。因特网密钥交换 （英语：Internet Key Exchange，简称 IKE 或 IKEv2）是一种网络协议，归属于 IPsec 协议族之下，用以创建安全关联 （Security association，SA）。与 IKEv1 相比较，IKEv2 带来许多<a href="https://en.wikipedia.org/wiki/Internet_Key_Exchange#Improvements_with_IKEv2" target="_blank">功能改进</a>，比如通过 MOBIKE 实现 Standard Mobility 支持，以及更高的可靠性。
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Libreswan 支持通过使用 RSA 签名算法的 X.509 Machine Certificates 来对 IKEv2 客户端进行身份验证。该方法无需 IPsec PSK, 用户名或密码。除了 Windows 之外，它也可用于 <a href="https://wiki.strongswan.org/projects/strongswan/wiki/AndroidVpnClient" target="_blank">strongSwan Android VPN 客户端</a>。下面举例说明如何配置 IKEv2。
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1. 获取服务器的公共和私有 IP 地址，并确保它们的值非空。注意，这两个 IP 地址可以相同。
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```bash
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$ PUBLIC_IP=$(dig @resolver1.opendns.com -t A -4 myip.opendns.com +short)
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$ PRIVATE_IP=$(ip -4 route get 1 | awk '{print $NF;exit}')
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$ echo "$PUBLIC_IP"
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(Your public IP is displayed)
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$ echo "$PRIVATE_IP"
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(Your private IP is displayed)
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```
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1. 在 `/etc/ipsec.conf` 文件中添加一个新的 IKEv2 连接:
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```bash
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$ cat >> /etc/ipsec.conf <<EOF
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conn ikev2-cp
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left=$PRIVATE_IP
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leftcert=$PUBLIC_IP
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leftid=@$PUBLIC_IP
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leftsendcert=always
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leftsubnet=0.0.0.0/0
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leftrsasigkey=%cert
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right=%any
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rightaddresspool=192.168.43.10-192.168.43.250
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rightca=%same
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rightrsasigkey=%cert
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modecfgdns1=8.8.8.8
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modecfgdns2=8.8.4.4
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narrowing=yes
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dpddelay=30
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dpdtimeout=120
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dpdaction=clear
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auto=add
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ikev2=insist
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rekey=no
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fragmentation=yes
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forceencaps=yes
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ike=3des-sha1,aes-sha1,aes256-sha2_512,aes256-sha2_256
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phase2alg=3des-sha1,aes-sha1,aes256-sha2_512,aes256-sha2_256
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EOF
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```
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1. 生成 Certificate Authority (CA) 和 VPN 服务器证书：
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```bash
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$ certutil -S -x -n "Example CA" -s "O=Example,CN=Example CA" -k rsa -g 4096 -v 12 -d sql:/etc/ipsec.d -t "CT,," -2
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A random seed must be generated that will be used in the
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creation of your key. One of the easiest ways to create a
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random seed is to use the timing of keystrokes on a keyboard.
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To begin, type keys on the keyboard until this progress meter
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is full. DO NOT USE THE AUTOREPEAT FUNCTION ON YOUR KEYBOARD!
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Continue typing until the progress meter is full:
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|************************************************************|
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Finished. Press enter to continue:
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Generating key. This may take a few moments...
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Is this a CA certificate [y/N]?
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y
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Enter the path length constraint, enter to skip [<0 for unlimited path]: >
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Is this a critical extension [y/N]?
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N
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$ certutil -S -c "Example CA" -n "$PUBLIC_IP" -s "O=Example,CN=$PUBLIC_IP" -k rsa -g 4096 -v 12 -d sql:/etc/ipsec.d -t ",," -1 -6 -8 "$PUBLIC_IP"
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A random seed must be generated that will be used in the
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creation of your key. One of the easiest ways to create a
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random seed is to use the timing of keystrokes on a keyboard.
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To begin, type keys on the keyboard until this progress meter
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is full. DO NOT USE THE AUTOREPEAT FUNCTION ON YOUR KEYBOARD!
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Continue typing until the progress meter is full:
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|************************************************************|
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Finished. Press enter to continue:
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Generating key. This may take a few moments...
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0 - Digital Signature
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1 - Non-repudiation
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2 - Key encipherment
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3 - Data encipherment
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4 - Key agreement
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5 - Cert signing key
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6 - CRL signing key
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Other to finish
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> 0
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0 - Digital Signature
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1 - Non-repudiation
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2 - Key encipherment
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3 - Data encipherment
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4 - Key agreement
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5 - Cert signing key
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6 - CRL signing key
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Other to finish
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> 2
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0 - Digital Signature
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1 - Non-repudiation
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2 - Key encipherment
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3 - Data encipherment
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4 - Key agreement
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5 - Cert signing key
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6 - CRL signing key
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Other to finish
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> 8
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Is this a critical extension [y/N]?
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N
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0 - Server Auth
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1 - Client Auth
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2 - Code Signing
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3 - Email Protection
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4 - Timestamp
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5 - OCSP Responder
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6 - Step-up
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7 - Microsoft Trust List Signing
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Other to finish
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> 0
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0 - Server Auth
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1 - Client Auth
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2 - Code Signing
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3 - Email Protection
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4 - Timestamp
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5 - OCSP Responder
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6 - Step-up
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7 - Microsoft Trust List Signing
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Other to finish
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> 8
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Is this a critical extension [y/N]?
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N
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```
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1. 生成客户端证书，并且导出 p12 文件。该文件包含客户端证书，私钥以及 CA 证书：
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```bash
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$ certutil -S -c "Example CA" -n "winclient" -s "O=Example,CN=winclient" -k rsa -g 4096 -v 12 -d sql:/etc/ipsec.d -t ",," -1 -6 -8 "winclient"
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-- repeat same extensions as above --
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$ pk12util -o winclient.p12 -n "winclient" -d sql:/etc/ipsec.d
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Enter password for PKCS12 file:
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Re-enter password:
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pk12util: PKCS12 EXPORT SUCCESSFUL
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```
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可以重复该步骤来为更多的客户端生成证书，但必须把所有的 `winclient` 换成 `winclient2`，等等。
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1. 证书数据库现在应该包含以下内容：
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```bash
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$ certutil -L -d sql:/etc/ipsec.d
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Certificate Nickname Trust Attributes
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SSL,S/MIME,JAR/XPI
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Example CA CTu,u,u
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($PUBLIC_IP) u,u,u
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winclient u,u,u
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```
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注：如需删除证书，可运行命令 `certutil -D -d sql:/etc/ipsec.d -n "Certificate Nickname"`。
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1. 重启 IPsec 服务：
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```bash
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$ service ipsec restart
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```
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1. 文件 `winclient.p12` 应该被安全的传送到 Windows 客户端计算机，并且导入到 Computer 证书存储。在导入 CA 证书后，它必须被放入（或移动到） "Trusted Root Certification Authorities" 目录的 "Certificates" 子目录中。
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详细的操作步骤：
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https://wiki.strongswan.org/projects/strongswan/wiki/Win7Certs
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1. 在 Windows 计算机上添加一个新的 IKEv2 VPN 连接。
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https://wiki.strongswan.org/projects/strongswan/wiki/Win7Config
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1. 启用新的 IKEv2 VPN 连接，并且开始使用自己的专属 VPN！
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https://wiki.strongswan.org/projects/strongswan/wiki/Win7Connect
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连接成功后，你可以到<a href="https://www.whatismyip.com" target="_blank">这里</a>检测你的 IP 地址，应该显示为`你的 VPN 服务器 IP`。
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## 已知问题
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Windows 7 和更新版本自带的 VPN 客户端不支持 IKEv2 fragmentation。在有些网络上，这可能会导致连接错误 "Error 809"，或者可能在连接后无法打开任何网站。如果出现这些问题，请首先尝试 <a href="clients-zh.md#故障排除" target="_blank">这个解决方案</a>。如果仍然无法解决，请使用 <a href="clients-zh.md" target="_blank">IPsec/L2TP</a> 或者 <a href="clients-xauth-zh.md" target="_blank">IPsec/XAuth</a> 协议连接。
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## 参考链接
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* https://libreswan.org/wiki/VPN_server_for_remote_clients_using_IKEv2
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* https://libreswan.org/wiki/HOWTO:_Using_NSS_with_libreswan
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* https://libreswan.org/man/ipsec.conf.5.html
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* https://wiki.strongswan.org/projects/strongswan/wiki/Windows7
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