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New-StandAloneCaCertificate.ps1
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New-StandAloneCaCertificate.ps1
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# New-StandAloneCaCertificate
#
# https://gist.github.com/jasonadsit/be97a6a3331dbee61cd74a1ebd4adf11
# https://pastebin.com/HxrjJ10z
#
[CmdletBinding()]
param (
[parameter(Mandatory=$true,Position=0,HelpMessage="Enter the FQDN of the server hosting the standalone CA.")]
[string]
$CaServerName,
[parameter(Mandatory=$true,Position=1,HelpMessage="Enter the name of the standalone CA.")]
[string]
$CaName,
[string]
$CaString = "$CaServerName\$CaName",
[string]
$WorkingDirectory = $env:TEMP,
[string]
$StandAloneCaCertRequestInf = $(Join-Path -Path $WorkingDirectory -ChildPath 'StandAloneCaCertRequest.inf'),
[string]
$StandAloneCaCertRequestReq = $(Join-Path -Path $WorkingDirectory -ChildPath 'StandAloneCaCertRequest.req'),
[string]
$StandAloneCaCertResponseCert = $(Join-Path -Path $WorkingDirectory -ChildPath 'StandAloneCaCertResponse.cer'),
[string]
$StandAloneCaCertResponse = $(Join-Path -Path $WorkingDirectory -ChildPath 'StandAloneCaCertResponse.rsp'),
[string[]]
$TempFiles = @($StandAloneCaCertRequestInf,$StandAloneCaCertRequestReq,$StandAloneCaCertResponseCert,$StandAloneCaCertResponse),
[string]
$CertReqExe = $(Join-Path -Path ([System.Environment]::SystemDirectory) -ChildPath 'certreq.exe'),
[string]
$ComputerName = $env:COMPUTERNAME,
[string]
$Fqdn = "$ComputerName.$env:USERDNSDOMAIN",
[string]
$ComputerNameUpper = $($ComputerName.ToUpper()),
[string]
$FqdnUpper = $($Fqdn.ToUpper()),
[string]
$ComputerNameLower = $($ComputerName.ToLower()),
[string]
$FqdnLower = $($Fqdn.ToLower())
) #param
process {
Write-Verbose -Message "Getting the list of machine certificates."
$StandAloneCaCert = Get-ChildItem -Path Cert:\LocalMachine\My |
Where-Object {
$_.FriendlyName -Match $ComputerName -and
$_.Issuer -EQ "CN=$CaName, DC=example, DC=com"
}
Write-Verbose -Message "Testing to see if any are issued by our CA."
if (-not ($StandAloneCaCert)) {
Write-Verbose -Message "No certificate issued by our CA found."
Write-Verbose -Message "Testing if CertReq TempFiles already exist."
$TempFilesToDelete = $TempFiles | Where-Object { Test-Path -Path $_ }
if ($TempFilesToDelete) {
Write-Verbose -Message "Deleting CertReq TempFiles."
$TempFilesToDelete | Remove-Item | Out-Null
} #if
Write-Verbose -Message "Building $StandAloneCaCertRequestInf"
[string] $RequestInf = @"
;----------------- request.inf -----------------
[Version]
Signature="`$Windows NT$"
[NewRequest]
FriendlyName = "$ComputerNameLower"
Subject = "CN=$FqdnLower, OU=Some Department, C=US, O=Some Company"
KeySpec = 1
KeyAlgorithm = ECDSA_P256
KeyLength = 256
HashAlgorithm = SHA256
Exportable = TRUE
MachineKeySet = TRUE
SMIME = False
PrivateKeyArchive = FALSE
EncryptionAlgorithm = AES
EncryptionLength = 256
UserProtected = FALSE
UseExistingKeySet = FALSE
ProviderName = "Microsoft Software Key Storage Provider"
RequestType = PKCS10
KeyUsage = 0xf0
SuppressDefaults = TRUE
[EnhancedKeyUsageExtension]
OID=1.3.6.1.5.5.7.3.1 ; Server Authentication
OID=1.3.6.1.5.5.7.3.2 ; Client Authentication
OID=1.3.6.1.4.1.311.54.1.2 ; Remote Desktop Authentication
[Extensions]
2.5.29.17 = "{text}"
_continue_ = "dns=$FqdnUpper&"
_continue_ = "dns=$ComputerNameUpper&"
_continue_ = "dns=$FqdnLower&"
_continue_ = "dns=$ComputerNameLower"
;-----------------------------------------------
"@
Write-Verbose -Message "Backing-Up FIPS Policy"
$CurrentFipsPolicy = (Get-Item -Path HKLM:\SYSTEM\CurrentControlSet\Control\Lsa\FipsAlgorithmPolicy).GetValue('Enabled')
Write-Verbose -Message "Killing FIPS Policy"
Set-ItemProperty HKLM:\SYSTEM\CurrentControlSet\Control\Lsa\FipsAlgorithmPolicy -Name Enabled -Value 0 -Force | Out-Null
Write-Verbose -Message "Writing $StandAloneCaCertRequestInf"
if (Test-Path -Path $StandAloneCaCertRequestInf) {
Remove-Item -Path $StandAloneCaCertRequestInf -Force | Out-Null
New-Item -Path $StandAloneCaCertRequestInf -ItemType File | Out-Null
} elseif (-not (Test-Path -Path $StandAloneCaCertRequestInf)) {
New-Item -Path $StandAloneCaCertRequestInf -ItemType File | Out-Null
} #if
Add-Content -Path $StandAloneCaCertRequestInf -Value $RequestInf | Out-Null
Write-Verbose -Message "Generating certificate request."
$CertReqArgs = "-New -machine `"$StandAloneCaCertRequestInf`" `"$StandAloneCaCertRequestReq`""
$SplatArgs = @{ FilePath = $CertReqExe
ArgumentList = $CertReqArgs
NoNewWindow = $true
Wait = $true }
$CertReqProc = Start-Process @SplatArgs
Write-Verbose -Message "Submitting certificate request."
$CertReqArgs = "-Submit -rpc -AdminForceMachine -config `"$CaString`" `"$StandAloneCaCertRequestReq`" `"$StandAloneCaCertResponseCert`""
$SplatArgs = @{ FilePath = $CertReqExe
ArgumentList = $CertReqArgs
NoNewWindow = $true
Wait = $true }
$CertReqProc = Start-Process @SplatArgs
Write-Verbose -Message "Accepting certificate request."
$CertReqArgs = "-Accept -machine `"$StandAloneCaCertResponseCert`""
$SplatArgs = @{ FilePath = $CertReqExe
ArgumentList = $CertReqArgs
NoNewWindow = $true
Wait = $true }
$CertReqProc = Start-Process @SplatArgs
Write-Verbose -Message "Deleting CertReq TempFiles."
$TempFilesToDelete = $TempFiles | Where-Object { Test-Path -Path $_ }
if ($TempFilesToDelete) {
$TempFilesToDelete | Remove-Item | Out-Null
} #if
$StandAloneCaCert = Get-ChildItem -Path Cert:\LocalMachine\My | Where-Object {
$_.FriendlyName -Match $ComputerName -and
$_.Issuer -EQ "CN=$CaName, DC=example, DC=com"
}
Write-Verbose -Message "Reset FIPS policy to its original value."
Set-ItemProperty HKLM:\SYSTEM\CurrentControlSet\Control\Lsa\FipsAlgorithmPolicy -Name Enabled -Value $CurrentFipsPolicy -Force | Out-Null
} elseif ($StandAloneCaCert) {
Write-Verbose -Message "There is already a certificate issued by our CA installed. Skipping."
} #if
Write-Output -InputObject $StandAloneCaCert
} #process
# New-StandAloneCaCertificate