Assign-Certificate.ps1

[CmdletBinding()]
    param(

        # a name you want to give to your certificate (can be anything you want for localhost)
        [Parameter(Mandatory=$True,Position=1)]
        [ValidateNotNullOrEmpty()]
        $dnsName = "localhost",

        #the website to apply the bindings/cert to (top level, not an application underneath!).
        [Parameter(Mandatory=$True,Position=2)]
        [ValidateNotNullOrEmpty()]
        $siteName = "Default Web Site",

        #fully qualified domain name (empty for 'All unassigned', or e.g 'contoso.com')
        [Parameter(Mandatory=$False,Position=3)]
        [ValidateNotNullOrEmpty()]
        $fqdn = ""
    )


Clear-Host


# ----------------------------------------------------------------------------------------
# SSL CERTIFICATE CREATION
# ----------------------------------------------------------------------------------------

# create the ssl certificate that will expire in 2 years
$newCert = New-SelfSignedCertificate -DnsName $dnsName -CertStoreLocation cert:\LocalMachine\My -NotAfter (Get-Date).AddYears(2)
"Certificate Details:`r`n`r`n $newCert"


# ----------------------------------------------------------------------------------------
# IIS BINDINGS
# ----------------------------------------------------------------------------------------


$webbindings = Get-WebBinding -Name $siteName
$webbindings


$hasSsl = $webbindings | Where-Object { $_.protocol -like "*https*" }

if($hasSsl)
{
    Write-Output "ERROR: An SSL certificate is already assigned. Please remove it manually before adding this certificate."
    Write-Output "Alternatively, you could just use that certificate (provided it's recent/secure)."
}
else
{
    "Applying TLS/SSL Certificate"
    New-WebBinding -Name $siteName -Port 443 -Protocol https -HostHeader $fqdn
    (Get-WebBinding -Name $siteName -Port 443 -Protocol "https" -HostHeader $fqdn).AddSslCertificate($newCert.Thumbprint, "my")

    "`r`n`r`nNew web bindings"
    $webbindings = Get-WebBinding -Name $siteName
    $webbindings
}


"`r`n`r`nSSL Assignment Complete"