ACMESharp-IIS/ACMESharp-IIS.psm1

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#cd C:\prj\letsencrypt\solutions\letsencrypt-win\letsencrypt-win\ACMESharp.POSH
#Add-Type -Path .\bin\Debug\ACMESharp.POSH.dll

<#
Configure/install certs

Install-ACMECertificateToIIS -Ref <cert-ref>
 -ComputerName <target-server> - optional (defaults to local)
 -Website <website-name> - optional (defaults to 'Default Web Site')
 -HostHeader <hostheader-name> - optional (defaults to none)
 -IPAddress <ip-address> - optional (defaults to all)
 -Port <port-num> - optional (defaults to 443)
 -VaultProfile <vp>
#>


function Install-CertificateToIIS {
    param(
        [Parameter(Mandatory=$true)]
        [string]$Certificate,
        [string]$WebSite = "Default Web Site",
        [string]$IPAddress,
        [int]$Port,
        [string]$SNIHostname,
        [switch]$SNIRequired,
        [switch]$Replace,
        [string]$VaultProfile,

        [System.Management.Automation.Runspaces.PSSession]$RemoteSession
    )

    ## TODO: We'll need to either "assume" that the user has
    ## already imported the module or explicitly re-import it
    ## and we'll also have to address the Default Noun Prefix
    ##Import-Module ACMESharp

    $vpParams = @{}
    if ($VaultProfile) {
        $vpParams.VaultProfile = $VaultProfile
    }

    $ci = Get-ACMECertificate @vpParams -Ref $Certificate
    if ($ci.IssuerSerialNumber) {
        $ic = Get-ACMEIssuerCertificate @vpParams -SerialNumber $ci.IssuerSerialNumber
        if ($ic) {
            if (-not $ic.CrtPemFile) {
                throw "Unable to resolve Issuer Certificate PEM file $($ci.IssuerSerialNumber)"
            }
        }
    }

    if (-not $ci.KeyPemFile) {
        throw "Unable to resolve Private Key PEM file"
    }
    if (-not $ci.CrtPemFile) {
        throw "Unable to resolve Certificate PEM file"
    }

    ## Export out the PFX to a local temp file
    $pfxTemp = [System.IO.Path]::GetTempFileName()
    $crt = Get-ACMECertificate @vpParams -Ref $Certificate -ExportPkcs12 $pfxTemp -Overwrite
    if (-not $crt.Thumbprint) {
        throw "Unable to resolve certificate Thumbprint"
    }

    ## Assemble a number of arguments and
    ## settings based on input parameters
    $webBindingArgs = @{
        Name = $WebSite
        Protocol = "https"
    }
    $sslBinding = @{
        Host = "0.0.0.0"
        Port = "443"
    }

    if ($IPAddress) {
        $webBindingArgs.IPAddress = $IPAddress
        $sslBinding.Host = $IPAddress
    }
    if ($Port) {
        $webBindingArgs.Port = $Port
        $sslBinding.Port = "$Port"
    }
    if ($SNIHostname) {
        $webBindingArgs.HostHeader = $SNIHostname
    }
    
    ## We craft a ScriptBlock to do the real work in such a way that we can invoke
    ## it locally or remotely based on the right combination of input parameters
    [scriptblock]$script = {
        param(
            [string]$CrtThumbprint,
            [string]$pfxTemp,
            [byte[]]$pfxBytes,
            [bool]$SNIRequired,
            [bool]$Replace,
            [hashtable]$webBindingArgs,
            [hashtable]$sslBinding
        )

        Write-Warning "Params:"
        Write-Warning " * $CrtThumbprint"
        Write-Warning " * $pfxTemp"
        Write-Warning " * $($pfxBytes.Length)"
        Write-Warning " * $SNIRequired"
        Write-Warning " * $Replace"
        Write-Warning " * $webBindingArgs"
        Write-Warning " * $sslBinding"

        ## If we're running locally, then the PFX temp file already exists
        ## If we're running remotely, we need to save the PFX bytes to a temp file
        if ($pfxBytes) {
            if (-not $pfxTemp) {
                $pfxTemp = [System.IO.Path]::GetTempFileName()
            }
            [System.IO.File]::WriteAllBytes($pfxTemp, $pfxBytes);
            Write-Verbose "Exported PFX bytes to temp file [$pfxTemp]"
        }

        ## Import the PFX file to the local machine store and make sure its there
        ## NOTE: instead of using the native PKI Cert path provider and cmdlets, we're using the
        ## .NET framework directly because it will work on older platforms (Win2008, PS3)
        $crtStore = new-object System.Security.Cryptography.X509Certificates.X509Store "My","LocalMachine"
        $crtBytes = [System.IO.File]::ReadAllBytes($pfxTemp)
        $crt = new-object System.Security.Cryptography.X509Certificates.X509Certificate2
        $crt.Import($crtBytes, $null, "Exportable,PersistKeySet”)
        Write-Verbose "Using certificate [$($crt.Thumbprint)]"
        $crtStore.Open("MaxAllowed")
        $exists = $crtStore.Certificates | ? { $_.Thumbprint -eq $crt.Thumbprint }
        if (-not $exists) {
            Write-Verbose "Importing certificate from PFX [$pfxTemp]"
            $crtStore.Add($crt)
            $exists = $crtStore.Certificates | ? { $_.Thumbprint -eq $crt.Thumbprint }
            if (-not $exists) {
                throw "Failed to import Certificate or import was misplaced"
            }
        }
        else {
            Write-Verbose "Existing certificate with matching Thumbprint found; SKIPPING"
        }
        $crtStore.Close()

        ## This is used later on for creating the SSL Binding
        $crtPath = "Cert:\LocalMachine\My\$($CrtThumbprint)"

        if (Test-Path $pfxTemp) {
            del $pfxTemp
        }

        ## We need the MS Web Admin Module
        Import-Module WebAdministration

        ## General guidelines for this procedure were borrowed from:
        ## http://www.iis.net/learn/manage/powershell/powershell-snap-in-configuring-ssl-with-the-iis-powershell-snap-in

        ## See if there is already a matching Web Binding
        Write-Verbose "Testing for existing Web Binding"
        $existingWebBinding = Get-WebBinding @webBindingArgs
        if ($existingWebBinding) {
            Write-Warning "Existing Web Binding found matching specified parameters; SKIPPING"
        }
        else {
            $webBindingCreateArgs = @{}
            if ($SNIRequired) {
                $webBindingCreateArgs.SslFlags = 1
            }

            Write-Verbose "Creating Web Binding..."
            New-WebBinding @webBindingArgs @webBindingCreateArgs
            $newWebBinding = Get-WebBinding @webBindingArgs
            if (-not $newWebBinding) {
                throw "Failed to create new Web Binding"
            }
            Write-Verbose "Web Binding was created"
        }

        ## See if there is already a matching SSL Binding
        Write-Verbose "Testing for existing SSL Binding"
        $sslBindingPath = "IIS:\SslBindings\$($sslBinding.Host)!$($sslBinding.Port)"
        Write-Verbose " ...testing for [$sslBindingPath]"
        if (Test-Path -Path $sslBindingPath) {
            if ($Replace) {
                Write-Warning "Deleting existing SSL Binding";
                Remove-Item $sslBindingPath
            }
            else {
                throw "Existing SSL Binding found"
            }
        }
        Write-Verbose "Creating SSL Binding..."
        Write-Verbose " ...at path [$sslBindingPath]"
        Get-Item $crtPath | New-Item $sslBindingPath
        $newSslBinding = Get-Item $sslBindingPath
        if (-not $newSslBinding) {
            throw "Failed to create new SSL Binding"
        }
        Write-Verbose "SSL Binding was created"
    }

    if ($RemoteSession)
    {
        $pfxBytes = [System.IO.File]::ReadAllBytes($pfxTemp);
        $invArgs = @(
            ,$ci.Thumbprint
            ,$null ## $pfxTemp
            ,$pfxBytes
            ,$SNIRequired.IsPresent
            ,$Replace.IsPresent
            ,$webBindingArgs
            ,$sslBinding
        )
        Invoke-Command -Session $RemoteSession -ArgumentList $invArgs -ScriptBlock $script
    }
    else {
        $invArgs = @(
            ,$ci.Thumbprint
            ,$pfxTemp
            ,$null ## $pfxBytes
            ,$SNIRequired.IsPresent
            ,$Replace.IsPresent
            ,$webBindingArgs
            ,$sslBinding
        )
        $script.Invoke($invArgs)
    }

    ## Delete the local PFX temp file
    if (Test-Path $pfxTemp) {
        del $pfxTemp
    }
}

Export-ModuleMember -Function Install-CertificateToIIS