Wednesday, September 20, 2017

Powershell : Certutil Find Expired Certs on CA server

Wrote this to get certificate expiration information for certificates that expired 5 days ago to ones that expire in 90 days. Wrap an invoke-command around this for remote query.
$Before = (get-date).adddays(90).ToString("MM/dd/yyyy")
$After = (get-date).AddDays(-5).ToString("MM/dd/yyyy")
<#

https://blogs.technet.microsoft.com/poshchap/2016/01/01/powershell-and-certutil-exe/
We create a date range with
$Before, i.e. certificates expiring before this date, and
$After, i.e. certificates expiring after this date. These values are converted into something that certutil can understand - $Restrict. This is then used with the certutil -restrict parameter.
#>
$Restrict = "NotAfter<=$Before,NotAfter>=$After"
$Report = @()
$cmd = & certutil.exe -view -restrict $Restrict -out "RequesterName,CommonName,Certificate Expiration Date","Certificate Template"

$SplitLines = $cmd.Split("`n`r")

$Index = 0
foreach ($line in $SplitLines){

    if ($line -like "Row*" ){
        $Details = New-Object PSObject 
        $Details | Add-Member noteProperty "RequesterName" $SplitLines[$index+1].split(":")[1].Replace("`"","").Replace(" ","")
        $Details | Add-Member noteProperty "CommonName" $SplitLines[$index+2].split(":")[1].Replace("`"","").Replace(" ","")
        $Details | Add-Member noteProperty "Certificate Expiration Date" $SplitLines[$index+3].split(':')[1].split(" ")[1].Replace(" ","")

        
        if ($SplitLines[$index+4].split(":")[1].Replace("`"","") -notlike "*1.*") {
            $TemplateName = $SplitLines[$index+4].split(":")[1].Replace("`"","").Replace(" ","")
        }
        Else {
        write-host "hit"
        $templatename = $SplitLines[$index+4].split(":")[1].Replace("`"","").split(" ")[2].Replace(" ","")
        }

        $Details | Add-Member noteProperty "Certificate Template" $TemplateName
        
        
        
        $report += $Details 
    
    }

    $Index++
}
$report

1 comment:

  1. Hi, I'm new with powershell scripting.
    I'm trying to run this script with a certificate template name that i need but something is not working, I'm getting the message: You cannot call a method on a null-valued expression.
    + $Details | Add-Member noteProperty "NotAfter" $SplitLines[$in ...
    can you advise what is wrong in the script.
    thanks,


    $Before = (get-date).adddays(30).ToString("MM/dd/yyyy")
    $After = (get-date).AddDays(-0).ToString("MM/dd/yyyy")
    <#

    https://blogs.technet.microsoft.com/poshchap/2016/01/01/powershell-and-certutil-exe/
    We create a date range with
    $Before, i.e. certificates expiring before this date, and
    $After, i.e. certificates expiring after this date. These values are converted into something that certutil can understand - $Restrict. This is then used with the certutil -restrict parameter.
    #>
    #$templateName1 = '1.3.6.1.4.1.311.21.8.8008174.2097614.15483563.10087481.10944406.3.5570057.1621657'
    $Restrict = "NotAfter <= $Before ,NotAfter >= $After"
    $Report = @()
    $cmd = & certutil -view -restrict $Restrict -out "RequesterName,CommonName,NotAfter","certificate Template"
    # | Where-Object{ ($_.Oid.FriendlyName -eq 'Certificate Template Information') -and ($_.Format(0) -match $templateName1) }
    $SplitLines = $cmd.Split("`n`r")

    $Index = 0
    foreach ($line in $SplitLines){

    if ($line -like "Row*" ){
    $Details = New-Object PSObject
    $Details | Add-Member noteProperty "RequesterName" $SplitLines[$index+1].split(":")[1].Replace("`"","").Replace(" ","")
    $Details | Add-Member noteProperty "CommonName" $SplitLines[$index+2].split(":")[1].Replace("`"","").Replace(" ","")
    $Details | Add-Member noteProperty "NotAfter" $SplitLines[$index+3].split(':')[1].split(" ")[1].Replace(" ","")


    if ($SplitLines[$index+4].split(":")[1].Replace("`"","") -notlike "*1.*") {
    $TemplateName = $SplitLines[$index+4].split(":")[1].Replace("`"","").Replace(" ","")
    }
    Else {
    write-host "hit"
    $templatename = $SplitLines[$index+4].split(":")[1].Replace("`"","").split(" ")[2].Replace(" ","")
    }

    $Details | Add-Member noteProperty "Certificate Template" $TemplateName



    $report += $Details

    }

    $Index++
    }
    $report

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