IPSec

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`Strong Swan <https://www.strongswan.org/>`__使用`PKCS#11驱动<https://www.nitrokey.com/documentation/applications#pkcs11>`__工作。基本上遵循这些步骤。

1. 通过pkcs11工具在Nitrokey上生成一个密钥。在这个例子中，它是一个4096位的RSA密钥。

   $ pkcs11-tool --module /usr/lib/x86_64-linux-gnu/pkcs11/opensc-pkcs11.so -l -k --key-type rsa:4096 --id 10 --label 'Staging Access'
   

2. 通过openssl + pkcs11模块生成一个证书签名请求

   $ openssl
   OpenSSL> engine dynamic -pre SO_PATH:/usr/lib/x86_64-linux-gnu/engines-1.1/pkcs11.so -pre ID:pkcs11 -pre LIST_ADD:1 -pre LOAD -pre MODULE_PATH:/usr/lib/x86_64-linux-gnu/pkcs11/opensc-pkcs11.so
   OpenSSL> req -engine pkcs11 -sha256 -new -key id_10 -keyform engine -out user@email.com-staging-cert.csr -subj '/C=GB/L=Cambridge/O=Organization/OU=Staging Access/CN=user@email.com/emailAddress=user@email.com'
   

3. 用你的证书颁发机构签署证书

4. 将证书转换为DER

   $ openssl x509 -in user@email.com-staging-cert.csr -out user@email.com-staging-cert.der -outform DER
   

5. 通过pkcs11工具将证书导入到Nitrokey。

   $ pkcs11-tool --module /usr/lib/x86_64-linux-gnu/pkcs11/opensc-pkcs11.so -l -y cert -w user@email.com-staging-cert.der --id 10 --label 'Staging Access'
   

6. 配置Strongswan以加载opensc-pkcs11模块，然后在Nitrokey上加载证书。编辑/etc/strongswan.d/charon/pkcs11.conf并添加以下模块。

   modules {
           Nitrokey {
                   path = /usr/lib/x86_64-linux-gnu/pkcs11/opensc-pkcs11.so
           }
   }
   

7. 通过IPSec/Strongswan启动VPN连接，然后提示输入Nitrokey PIN。

8. VPN现在已连接