####
### pfSense Certificate Viewer (without private key)
### Version 1.0.6
####
# Redefine the $cfg string variable to point to a valid unecrypted pfSense Configuration XML file.
# You can also use the command line FilePath parameter as path to the input XML cfg file

# This script will return the CA certificates, Server certificates, User certificates (used or not) and duplicated Serial Number Certificates
#
# Tested on PowerShell 5.0 and avobe
# Created by Alvaro Sedano Galindo. al_sedano@hotmail.com
#

#[CmdletBinding()]
    Param (
        [Parameter(Mandatory=$false `
                  ,Position=0 `
                  ,ValueFromPipeline=$true `
                  ,ValueFromPipelineByPropertyName=$true)]
        [Alias("File")]
        [string]$FilePath)


Function Get-BeginEndWO {
    Param([Parameter(Mandatory=$true, Position=0)][string]$path `
         ,[Parameter(Mandatory=$true, Position=1)][ref]$osslDec)

    #OPNsense saves on the xml encrypted file information about how to decrypt it.
    #pfSense does'nt.

    #First line is #0
    #Check if "^Version: OPNsense" exists in #line 1
    [string[]]$text = Get-Content $path -Encoding UTF8
    if ($text[1] -match '^Version: OPNsense') {
        [int]$start = 5
    }
    else {
        [int]$start = 1
    }

    #Match for "^Cipher: " in #line 2
    if ($text[2] -match '^Cifer: (?<cipher>.*)$') {
        # found
        [string]$cipher = ($Matches['cipher']).ToLower()
    }
    else {
        [string]$cipher = 'aes-256-cbc'
    }
        
    #Match for "^Hash: " in #line 3
    if ($text[3] -match '^Hash: (?<hash>.*)$') {
        # found
        [string]$hash = ($Matches['hash']).ToLower()
    }
    else {
        [string]$hash = 'md5'
    }

    #Decrypt array
    $osslDec.Value = [string[]]($cipher, $hash)

    #Remove 1st and last lines
    $text[$start..($text.Count-2)]
}

Function Get-CN {
    Param([Parameter(Mandatory=$true)][string]$name)
    if($name -match "CN=([^,]*)") {
        $Matches[1] }
    else {$name}
}

Function Add-Lista {
    Param([Parameter(Mandatory=$true)][ref]$lista `
         ,[Parameter(Mandatory=$true)][ref]$obj `
         ,[Parameter(Mandatory=$true)][bool]$fromCA)

    [string]$oidCLI = '1.3.6.1.5.5.7.3.2'
    [string]$oidSRV = '1.3.6.1.5.5.7.3.1'
    [array]$revs = $listaR | Select -ExpandProperty refid -Unique
    [System.Security.Cryptography.X509Certificates.X509Certificate2]$ccc = $null
    foreach($c in $obj.Value) {
        $ccc = [System.Security.Cryptography.X509Certificates.X509Certificate2]::new([System.Convert]::FromBase64String($c.crt))
        $ccc.FriendlyName = $c.descr.'#cdata-section'
        $objTmp = $ccc | Select *, @{N='IsCA';E={$fromCA}} `
                                  , @{N='IsServer';E={-not $fromCA -and $_.EnhancedKeyUsageList.ObjectId -contains $oidSRV}} `
                                  , @{N='IsClient';E={-not $fromCA -and $_.EnhancedKeyUsageList.ObjectId -contains $oidCLI}} `
                                  , @{N='sIssuer';E={Get-CN($_.Issuer)}}, @{N='sSubject';E={Get-CN($_.Subject)}} `
                                  , @{N='refid'; E={$c.refid}} `
                                  , @{N='isRevoked'; E={-not $fromCA -and $c.refid -in $revs}} `
                                  , @{N='revokedOn'; Expression={$null}} `

        if ($objTmp.isRevoked) {
            [string[]]$strRev = @()
            foreach($d in $listaR) {
                if ($d.refid -eq $c.refid) {
                    $strRev += [string]($d.listRev)
                }
            }
            $objTmp.revokedOn = $strRev
        }
        $lista.Value += $objTmp
    }
}

Function Decrypt {
    Param([Parameter(Mandatory=$true,Position=0)][string]$fileIn
         ,[Parameter(Mandatory=$true,Position=1)][string]$fileOut
         ,[Parameter(Mandatory=$true, Position=2)][ref]$osslDec
         ,[Parameter(Mandatory=$false,Position=3)][string]$pass)

    # If $openSSL is not '', we will look for the openSSL.exe available with openVPN install.
    # You can define a value for $openSSL if you have a valid openssl executable path.
    [string]$openSSL = ''
    if ($openSSL -eq '') {
        #Look for openvpn installation
        [string]$rutaREG = "Registry::HKEY_LOCAL_MACHINE\SOFTWARE\OpenVPN"
        if (-not (Test-Path($rutaREG))) {
            Write-Host 'No openvpn installation found. openssl.exe is part of the openVPN installation. ' + `
                       'If you have another openssl.exe available path, you can redefine the $openSSL variable at line 114.' -BackgroundColor DarkRed
            Exit 3
        }
        
        $openSSL = ((Get-ItemProperty -Path $rutaREG).exe_path).Replace("openvpn.exe", "openssl.exe")
    }

    if ($pass -eq '') {
        [System.Security.SecureString]$pwd = Read-Host "Password XML File:" -AsSecureString
        $pass = [Runtime.InteropServices.Marshal]::PtrToStringAuto([Runtime.InteropServices.Marshal]::SecureStringToBSTR($pwd))
    }

    [string]$cipher = ($osslDec.Value)[0]
    [string]$hash   = ($osslDec.Value)[1]
    & "$($openSSL)" enc -d -$($cipher) -in "$($fileIn)" -out "$($fileOut)" -salt -md $($hash) -k ''$($pass)''
}

Function Get-ConfigFile {
    Param([Parameter(Mandatory=$true,Position=0)][string]$filePath `
         ,[Parameter(Mandatory=$true,Position=1)][ref]$xml)

    if (-not (Test-Path -Path $filePath)) {
        Write-Host "File '$cfg' not found. Process stopped." -BackgroundColor DarkRed
        Exit 1
    }

    [bool]$encrypted = $false
    try {
        $xml.Value = Get-Content $filePath -Encoding UTF8
    }
    catch {
        $encrypted = $true
    }

    if ($encrypted -eq $true) {
        #Encrypted xml file
        [string[]]$osslDec = $null
        [string[]]$cifrado = Get-BeginEndWO -path $filePath -osslDec ([ref]$osslDec)
        $f1Cin  = New-TemporaryFile
        $f1Cou  = New-TemporaryFile
        try {
            [IO.File]::WriteAllBytes($f1Cin.FullName, [System.Convert]::FromBase64String($cifrado))
            Decrypt -fileIn $f1Cin.FullName -fileOut $f1Cou.FullName -osslDec ([ref]$osslDec)

            # Check if file exists
            if (-not (Test-Path $f1Cou.FullName) -or (Get-Item $f1Cou.FullName).Length -eq 0) {
                Write-Host "Unable to decrypt file. Process stoped." -BackgroundColor DarkRed
                Exit 4
            }
            
            # File exists
            $xml.Value = Get-Content $f1Cou.FullName -Encoding UTF8
        }
        catch {
            Write-Host "Error decrypting xml file: Bad password. Process stoped." -BackgroundColor DarkRed
            Exit 5
        }
        finally {
            Remove-Item $f1Cin.FullName -Force
            Remove-Item $f1Cou.FullName -Force
        }
    }
}


#
# BODY
#

#$ErrorActionPreference = 'SilentlyContinue'

# Check if param 0 is assigned
if ($FilePath -eq $null -or $FilePath -eq '') {
    [string]$cfg = "$env:USERPROFILE\Downloads\config-pfSense01.private.xml"
}
else {
    # Use the FilePath console input parameter
    [string]$cfg = $FilePath
}


#Read XML pfSense config file (UTF8 Encoding)
[xml]$fxml = $null
Get-ConfigFile -filePath $cfg -xml ([ref]$fxml)

#Check for pfSense/OPNsense products
if ($fxml.ChildNodes.Count -eq 2) {
    [System.Xml.XmlElement]$product = $fxml.ChildNodes[1]
    if ($product.Name -notin ('pfsense','opnsense')) {
        Write-Host 'The xml file does not contains a pfSense or OPNsense backup. Process stoped.' -BackgroundColor DarkRed
        Exit 6
    }
}

Remove-Variable fxml

#Get the CRL revocation list
[DateTime]$time0 = '1970-01-01'
[array]$listaR = @()
foreach($r in $product.crl) {
    $listaR += $r.cert | Select @{N='listRev';E={$r.descr.'#cdata-section'}}, caref, refid, reason, @{N='revDate';E={$time0.AddSeconds($_.revoke_time)}}
}

#Add CA Certificates to $listaC (WITHOUT private keys)
[array]$listaC = @()
Add-Lista -lista ([ref]$listaC) -obj ([ref]$product.ca) -fromCA $true

#Add user/server certificates to $listaC (WITHOUT private keys)
Add-Lista -lista ([ref]$listaC) -obj ([ref]$product.cert) -fromCA $false
#Note: User Certificates created with old pfSense versions could set the EnhancedKeyUsageList property to <empty>.

Remove-Variable product

#List of CA Certificates
Write-Output "`nCA Certificates"
$listaC | Where-Object {$_.isCA} | Select sIssuer, SerialNumber, FriendlyName, DnsNameList, sSubject | Sort-Object -Property sIssuer, SerialNumber | ft

#List of Server Certificates
Write-Output "`nServer Certificates"
$listaC | Where-Object {$_.isServer} | Select sIssuer, SerialNumber, FriendlyName, DnsNameList, sSubject, revokedOn | Sort-Object -Property sIssuer, SerialNumber | ft

#List of User Certificates (not CA and not Server)
Write-Output "`nUser Certificates"
$listaC | Where-Object {-not ($_.isCA -or $_.isServer)} | Select sIssuer, SerialNumber, FriendlyName, DnsNameList, sSubject, revokedOn | Sort-Object -Property sIssuer, SerialNumber | ft

#List of Dupicated SerialNumbers (per CA)
Write-Output "`nDuplicated Serial Numbers (per CA)"
$listaC | Select sIssuer, SerialNumber, FriendlyName, DnsNameList, sSubject, revokedOn | Group-Object -Property sIssuer, SerialNumber | Where-Object {$_.Count -gt 1} | Select -ExpandProperty Group | ft