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

Admin by Admin
April 11, 2025
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There are lots of let’s encrypt computerized instruments for azure however I additionally wished 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 finally wants a particular format known as dot PFX that features the complete certificates path and all intermediates.

Per the docs, App Service non-public certificates should meet the next necessities:

  • Exported as a password-protected PFX file, encrypted utilizing triple DES.
  • Accommodates non-public key not less than 2048 bits lengthy
  • Accommodates all intermediate certificates and the basis certificates within the certificates chain.

In case you have a PFX that does not meet all these necessities you may have Home windows reencrypt the file.

I take advantage of 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 verify it is two traces, and your domains and subdomains are right and your paths are right.

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/reside/azurefriday.com/privkey.pem
-in /and so forth/letsencrypt/reside/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, be aware the thumbprint and export that cert.

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

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

Then add the cert to the Certificates part of your App Service, beneath Deliver 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 most recent expiration date).

image

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




About Scott

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

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Tags: appAzureCertificatescreateEncryptLetsServiceSSLWildcardWSL
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