Creating and Applying SSL Certificate for OpenVPN Access Server

#OpenVPN #AccessServer #SSL

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Prerequisites
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Create Your SSL Certificate
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   01. Launch XCA
   02. Open the PKI database if it is not already (File ≫ Open DataBase), enter password
   03. Click on the Certificates tab, right click on your Intermediate CA certificate
   04. Select New
   05. On the Source tab, make sure Use this Certificate for signing is selected
   06. Verify your Intermediate CA certificate is selected from the drop down
   07. Click the Subject tab
   08. Complete the Distinguished Name section
         internalName: OpenVPN-AS SSL
         countryName: US
         stateOrProvinceName: Virginia
         localityName: Northern
         organizationName: i12bretro
         organizationUnitName: i12bretro Certificate Authority
   09. Click the Generate a New Key button
   10. Enter a name and set the key size to at least 2048
   11. Click Create
   12. Click on the Extensions tab
   13. Select End Entity from the type list
   14. Click Edit next to Subject Alternative Name
   15. Add any DNS or IP addresses that the certificate will identify
   16. Update the validity dates to fit your needs
   17. Click the Key Usage tab
   18. Under Key Usage select Digital Signature, Key Encipherment
   19. Under Extended Key Usage select Web Server and Web Client Authentication
   20. Click the Netscape tab
   21. Select SSL Server
   22. Click OK to create the certificate
 
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Exporting Required Files
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   01. In XCA, click on the Certificates tab
   02. Right click the Intermediate CA certificate ≫ Export ≫ File
   03. Set the file name with a .crt extension and verify the export format is PEM chain (*.pem)
   04. Click OK
   05. Right click the SSL certificate ≫ Export ≫ File
   06. Set the file name with a .crt extension and verify the export format is PEM (*.crt)
   07. Click OK
   08. Click the Private Keys tab
   09. Right click the private key generated for the SSL certificate ≫ Export ≫ File
   10. Set the file name with a .pk8 extension and verify the export format is PKCS #8 (*.pk8)
   11. Click OK
 
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Applying the Certificates
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   01. Log into OpenVPN Access Server
   02. Click Configuration ≫ Webserver in the left navigation
   03. Scroll down to the bottom of the page and upload the CA, certificate and key exported earlier
   04. Click the Validate button
   05. Click the Save button at the bottom
   06. Click the Update Running Server button
   07. Wait a few moments and refresh the page
 

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