Utilizing WSL and Let’s Encrypt to create Azure App Service SSL Wildcard Certificates

There are various let’s encrypt automated instruments for azure however I additionally needed to see if I might use certbot in wsl to generate a wildcard certificates for the azure Friday web site after which add the ensuing certificates to azure app service.

Azure app service in the end wants a particular format known as dot PFX that features the complete certificates path and all intermediates.

Per the docs, App Service personal certificates should meet the next necessities:

  • Exported as a password-protected PFX file, encrypted utilizing triple DES.
  • Accommodates personal key at the very least 2048 bits lengthy
  • Accommodates all intermediate certificates and the foundation certificates within the certificates chain.

When you’ve got a PFX that does not meet all these necessities you may have Home windows reencrypt the file.

I exploit WSL and certbot to create the cert, then I import/export in Home windows and add the ensuing PFX.

Inside WSL, set up certbot:

sudo apt replace
sudo apt set up python3 python3-venv libaugeas0
sudo python3 -m venv /decide/certbot/
sudo /decide/certbot/bin/pip set up --upgrade pip
sudo /decide/certbot/bin/pip set up certbot

Then I generate the cert. You may get a pleasant textual content UI from certbot and replace your DNS as a verification problem. Change this to ensure it is two strains, and your domains and subdomains are appropriate and your paths are appropriate.

sudo certbot certonly --manual --preferred-challenges=dns --email YOUR@EMAIL.COM   
--server https://acme-v02.api.letsencrypt.org/listing
--agree-tos --manual-public-ip-logging-ok -d "azurefriday.com" -d "*.azurefriday.com"
sudo openssl pkcs12 -export -out AzureFriday2023.pfx
-inkey /and so forth/letsencrypt/stay/azurefriday.com/privkey.pem
-in /and so forth/letsencrypt/stay/azurefriday.com/fullchain.pem

I then copy the ensuing file to my desktop (examine your desktop path) so it is now within the Home windows world.

sudo cp AzureFriday2023.pfx /mnt/c/Customers/Scott/OneDrive/Desktop

Now from Home windows, import the PFX, word the thumbprint and export that cert.

Import-PfxCertificate -FilePath "AzureFriday2023.pfx" -CertStoreLocation Cert:LocalMachineMy 
-Password (ConvertTo-SecureString -String 'PASSWORDHERE' -AsPlainText -Drive) -Exportable

Export-PfxCertificate -Cert Microsoft.PowerShell.SecurityCertificate::LocalMachineMy597THISISTHETHUMBNAILCF1157B8CEBB7CA1
-FilePath 'AzureFriday2023-fixed.pfx' -Password (ConvertTo-SecureString -String 'PASSWORDHERE' -AsPlainText -Drive)

Then add the cert to the Certificates part of your App Service, beneath Carry Your Personal Cert.

Custom Domains in Azure App Service

Then beneath Customized Domains, click on Replace Binding and choose the brand new cert (with the newest expiration date).


Subsequent step is to make this much more automated or choose a extra automated answer however for now, I will fear about this in September and it solved my costly Wildcard Area challenge.

About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, marketing consultant, father, diabetic, and Microsoft worker. He’s a failed stand-up comedian, a cornrower, and a guide writer.

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