Create and Apply SSL Certificates to OPNSense Web UI
11#OPNSense #SSL #PKI
Full steps can be found at https://i12bretro.github.io/tutorials/0339.html
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Prerequisites
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- A XCA PKI database https://youtu.be/ezzj3x207lQ
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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: fw.i12bretro.local
countryName: US
stateOrProvinceName: Virginia
localityName: Northern
organizationName: i12bretro
organizationUnitName: i12bretro Certificate Authority
commonName: fw.i12bretro.local
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 SSL certificate ≫ Export ≫ File
03. Set the file name with a .crt extension and verify the export format is PEM (*.crt)
04. Click OK
05. Click the Private Keys tab
06. Right click the private key generated for the SSL certificate ≫ Export ≫ File
07. Set the file name with a .pk8 extension and verify the export format is PKCS #8 (*.pk8)
08. Click OK
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Applying the Certificates
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01. Log into the OPNSense web UI
02. Click System ≫ Trust ≫ Certificates in the left navigation
03. Click the Add button at the top right
04. Set the Method to Import an existing Certificate
05. Set the Name to Web UI SSL
06. Open the .crt file exported earlier in Notepad, copy the contents to the Certificate data field
07. Open the .pk8 file exported earlier in Notepad, copy the contents to the Private key data field
08. Scroll down to the bottom of the page and click Save
09. Click System ≫ Settings ≫ Administration in the left navigation
10. Select HTTPS for the Protocol
11. Select Web UI SSL from the SSL Certificate dropdown
12. Scroll down to the bottom of the page and click Save
13. Wait a few seconds for the Web UI to restart and click the https:// link
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