functions/Remove-DbaNetworkCertificate.ps1

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#ValidationTags#Messaging,FlowControl,Pipeline,CodeStyle#

function Remove-DbaNetworkCertificate {
<#
 .SYNOPSIS
  Removes the network certificate for SQL Server instance
  
 .DESCRIPTION
  Removes the network certificate for SQL Server instance. This setting is found in Configuration Manager.
  
 .PARAMETER SqlInstance
  The target SQL Server - defaults to localhost. If target is a cluster, you must also specify InstanceClusterName (see below)
  
 .PARAMETER Credential
  Allows you to login to the computer (not sql instance) using alternative credentials.
  
 .PARAMETER EnableException
  By default, when something goes wrong we try to catch it, interpret it and give you a friendly warning message.
  This avoids overwhelming you with "sea of red" exceptions, but is inconvenient because it basically disables advanced scripting.
  Using this switch turns this "nice by default" feature off and enables you to catch exceptions with your own try/catch.
   
 .PARAMETER WhatIf
  Shows what would happen if the command were to run. No actions are actually performed.
  
 .PARAMETER Confirm
  Prompts you for confirmation before executing any changing operations within the command.
  
 .EXAMPLE
  Remove-DbaNetworkCertificate
   
  Removes the Network Certificate for the default instance (MSSQLSERVER) on localhost
  
 .EXAMPLE
  Remove-DbaNetworkCertificate -SqlInstance sql1\SQL2008R2SP2
   
  Removes the Network Certificate for the SQL2008R2SP2 instance on sql1
  
 .EXAMPLE
  Remove-DbaNetworkCertificate -SqlInstance localhost\SQL2008R2SP2 -WhatIf
   
  Shows what would happen if the command were run
  
 .NOTES
  Tags: Certificate
   
  Website: https://dbatools.io
  Copyright: (C) Chrissy LeMaire, clemaire@gmail.com
  License: GNU GPL v3 https://opensource.org/licenses/GPL-3.0
#>

    [CmdletBinding(SupportsShouldProcess, ConfirmImpact = "Low", DefaultParameterSetName = 'Default')]
    param (
        [Parameter(ValueFromPipeline = $true)]
        [Alias("ServerInstance", "SqlServer", "ComputerName")]
        [DbaInstanceParameter[]]
        $SqlInstance = $env:COMPUTERNAME,
        
        [PSCredential]
        
        $Credential,
        
        [switch]
        [Alias('Silent')]$EnableException
    )
    process {
        foreach ($instance in $sqlinstance) {
            Write-Message -Level VeryVerbose -Message "Processing $instance" -Target $instance
            $null = Test-ElevationRequirement -ComputerName $instance -Continue
            
            Write-Message -Level Verbose -Message "Resolving hostname"
            $resolved = $null
            $resolved = Resolve-DbaNetworkName -ComputerName $instance -Turbo
            
            if ($null -eq $resolved) {
                Stop-Function -Message "Can't resolve $instance" -Target $instance -Continue -Category InvalidArgument
            }
            
            Write-Message -Level Output -Message "Connecting to SQL WMI on $($instance.ComputerName)"
            try {
                $sqlwmi = Invoke-ManagedComputerCommand -ComputerName $resolved.FQDN -ScriptBlock { $wmi.Services } -Credential $Credential -ErrorAction Stop | Where-Object DisplayName -eq "SQL Server ($($instance.InstanceName))"
            }
            catch {
                Stop-Function -Message "Failed to access $instance" -Target $instance -Continue -ErrorRecord $_
            }
            
            $regroot = ($sqlwmi.AdvancedProperties | Where-Object Name -eq REGROOT).Value
            $vsname = ($sqlwmi.AdvancedProperties | Where-Object Name -eq VSNAME).Value
            $instancename = $sqlwmi.DisplayName.Replace('SQL Server (', '').Replace(')', '') # Don't clown, I don't know regex :(
            $serviceaccount = $sqlwmi.ServiceAccount
            
            if ([System.String]::IsNullOrEmpty($regroot)) {
                $regroot = $sqlwmi.AdvancedProperties | Where-Object { $_ -match 'REGROOT' }
                $vsname = $sqlwmi.AdvancedProperties | Where-Object { $_ -match 'VSNAME' }
                
                if (![System.String]::IsNullOrEmpty($regroot)) {
                    $regroot = ($regroot -Split 'Value\=')[1]
                    $vsname = ($vsname -Split 'Value\=')[1]
                }
                else {
                    Stop-Function -Message "Can't find instance $vsname on $instance" -Continue -Category ObjectNotFound -Target $instance
                }
            }
            
            if ([System.String]::IsNullOrEmpty($vsname)) { $vsname = $instance }
            
            Write-Message -Level Output -Message "Regroot: $regroot" -Target $instance
            Write-Message -Level Output -Message "ServiceAcct: $serviceaccount" -Target $instance
            Write-Message -Level Output -Message "InstanceName: $instancename" -Target $instance
            Write-Message -Level Output -Message "VSNAME: $vsname" -Target $instance
            
            $scriptblock = {
                $regroot = $args[0]
                $serviceaccount = $args[1]
                $instancename = $args[2]
                $vsname = $args[3]
                
                $regpath = "Registry::HKEY_LOCAL_MACHINE\$($args[0])\MSSQLServer\SuperSocketNetLib"
                $cert = (Get-ItemProperty -Path $regpath -Name Certificate).Certificate
                Set-ItemProperty -Path $regpath -Name Certificate -Value $null
                
                [pscustomobject]@{
                    ComputerName      = $env:COMPUTERNAME
                    InstanceName      = $instancename
                    SqlInstance          = $vsname
                    ServiceAccount    = $serviceaccount
                    RemovedThumbprint = $cert.Thumbprint
                }
            }
            
            if ($PScmdlet.ShouldProcess("local", "Connecting to $ComputerName to remove the cert")) {
                try {
                    Invoke-Command2 -ComputerName $resolved.fqdn -Credential $Credential -ArgumentList $regroot, $serviceaccount, $instancename, $vsname -ScriptBlock $scriptblock -ErrorAction Stop
                }
                catch {
                    Stop-Function -Message "Failed to connect to $($resolved.fqdn) using PowerShell remoting!" -ErrorRecord $_ -Target $instance -Continue
                }
            }
        }
    }
}