AzureVM/Renew-LetsEncryptCertificate.ps1
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<#
.Synopsis Renew a Lets Encrypt Certificate for a renew free 90 days trusted certificate .Description This command uses the Lets Encrypt ACME powershell module to renew a trusted certificate valid for 90 days. Note that if rate limits are exceeded, the script will fail. .Parameter publicDnsName Public DNS Name (URL/CNAME record pointing to your VM). .Parameter certificatePfxFilename Filename for certificate .pfx file .Parameter certificatePfxPassword Password for certificate .pfx file .Parameter dnsAlias DNS Alias is obsolete - you do not need to specify this .Example Renew-LetsEncryptCertificate -publicDnsName "host.westeurope.cloudapp.azure.com" -certificatePfxFilename "c:\temp\cert.pfx" -certificatePfxPassword (ConvertTo-SecureString -String "S0mep@ssw0rd!" -AsPlainText -Force) #> function Renew-LetsEncryptCertificate { Param ( [Parameter(Mandatory=$true)] [string] $publicDnsName, [Parameter(Mandatory=$true)] [string] $certificatePfxFilename, [Parameter(Mandatory=$true)] [SecureString] $certificatePfxPassword, [Parameter(Mandatory=$false)] [string] $dnsAlias = "dnsAlias" ) Write-Host "Importing ACME-PS module (need 1.1.0-beta or higher)" Import-Module ACME-PS $stateDir = Join-Path $hostHelperFolder "acmeState" if (Test-Path $certificatePfxFilename) { Write-Host "Removing existing certificate" Remove-Item -Path $certificatePfxFilename -Force } Write-Host "Creating new dns Identifier" $state = Get-ACMEState -Path $stateDir New-ACMENonce $state -PassThru | Out-Null $identifier = New-ACMEIdentifier $publicDnsName Write-Host "Creating ACME Order" $order = New-ACMEOrder $state -Identifiers $identifier Write-Host "Getting ACME Authorization" $authZ = Get-ACMEAuthorization -State $state -Order $order Write-Host "Getting ACME Challenge" $challenge = Get-ACMEChallenge $state $authZ "http-01" # Create the file requested by the challenge $fileName = "C:\inetpub\wwwroot$($challenge.Data.RelativeUrl)" $challengePath = [System.IO.Path]::GetDirectoryName($filename); if(-not (Test-Path $challengePath)) { New-Item -Path $challengePath -ItemType Directory | Out-Null } Set-Content -Path $fileName -Value $challenge.Data.Content -NoNewLine # Check if the challenge is readable Invoke-WebRequest $challenge.Data.AbsoluteUrl -UseBasicParsing | Out-Null Write-Host "Completing ACME Challenge" # Signal the ACME server that the challenge is ready $challenge | Complete-ACMEChallenge $state | Out-Null # Wait a little bit and update the order, until we see the states while($order.Status -notin ("ready","invalid")) { Start-Sleep -Seconds 10 $order | Update-ACMEOrder $state -PassThru | Out-Null } $certKeyFile = "$stateDir\$publicDnsName-$(get-date -format yyyy-MM-dd-HH-mm-ss).key.xml" $certKey = New-ACMECertificateKey -path $certKeyFile Write-Host "Completing ACME Order" Complete-ACMEOrder $state -Order $order -CertificateKey $certKey | Out-Null # Now we wait until the ACME service provides the certificate url while(-not $order.CertificateUrl) { Start-Sleep -Seconds 15 $order | Update-Order $state -PassThru | Out-Null } # As soon as the url shows up we can create the PFX Write-Host "Exporting certificate to $certificatePfxFilename" Export-ACMECertificate $state -Order $order -CertificateKey $certKey -Path $certificatePfxFilename -Password $certificatePfxPassword } Export-ModuleMember -Function Renew-LetsEncryptCertificate |