WinSSH

0.8.4

Public/Validate-SSHPrivateKey.ps1

                                <#

    .SYNOPSIS

        This function is meant to determine the following:

            - Whether or not the specified file is, in fact, an SSH Private Key

            - If the SSH Private Key File is password protected

        In order to test if we have a valid Private Key, and if that Private Key

        is password protected, we try and generate a Public Key from it using ssh-keygen.

        Depending on the output of ssh-keygen, we can make a determination.

    .DESCRIPTION

        See .SYNOPSIS

    .NOTES

    .PARAMETER PathToPrivateKeyFile

        This parameter is MANDATORY.

        This parameter takes a string that represents a full path to the file that we believe is

        a valid SSH Private Key that we want to test.

    .EXAMPLE

        # Open an elevated PowerShell Session, import the module, and -

        PS C:\Users\zeroadmin> Validate-SSHPrivateKey -PathToPrivateKeyFile "$HOME\.ssh\random"

#>

function Validate-SSHPrivateKey {

    [CmdletBinding()]

    Param(

        [Parameter(Mandatory=$True)]

        [string]$PathToPrivateKeyFile

    )

    # Make sure we have access to ssh binaries

    if (![bool]$(Get-Command ssh-keygen -ErrorAction SilentlyContinue)) {

        Write-Error "Unable to find 'ssh-keygen.exe'! Halting!"

        $global:FunctionResult = "1"

        return

    }

    # Make sure the path exists

    if (!$(Test-Path $PathToPrivateKeyFile)) {

        Write-Error "Unable to find the path '$PathToPrivateKeyFile'! Halting!"

        $global:FunctionResult = "1"

        return

    }

    $SSHKeyGenParentDir = $(Get-Command ssh-keygen).Source | Split-Path -Parent

    $SSHKeyGenArguments = "-y -f `"$PathToPrivateKeyFile`""

    $ProcessInfo = New-Object System.Diagnostics.ProcessStartInfo

    $ProcessInfo.WorkingDirectory = $SSHKeyGenParentDir

    $ProcessInfo.FileName = $(Get-Command ssh-keygen).Source

    $ProcessInfo.RedirectStandardError = $true

    $ProcessInfo.RedirectStandardOutput = $true

    #$ProcessInfo.StandardOutputEncoding = [System.Text.Encoding]::Unicode

    #$ProcessInfo.StandardErrorEncoding = [System.Text.Encoding]::Unicode

    $ProcessInfo.UseShellExecute = $false

    $ProcessInfo.Arguments = $SSHKeyGenArguments

    $Process = New-Object System.Diagnostics.Process

    $Process.StartInfo = $ProcessInfo

    $Process.Start() | Out-Null

    # Below $FinishedInAlottedTime returns boolean true/false

    $FinishedInAlottedTime = $Process.WaitForExit(5000)

    if (!$FinishedInAlottedTime) {

        $Process.Kill()

        $ProcessKilled = $True

    }

    $stdout = $Process.StandardOutput.ReadToEnd()

    $stderr = $Process.StandardError.ReadToEnd()

    $SSHKeyGenOutput = $stdout + $stderr

    if ($SSHKeyGenOutput -match "invalid format") {

        $ValidSSHPrivateKeyFormat = $False

        $PasswordProtected = $False

    }

    if ($SSHKeyGenOutput -match "ssh-rsa AA") {

        $ValidSSHPrivateKeyFormat = $True

        $PasswordProtected = $False

    }

    if ($SSHKeyGenOutput -match "passphrase|pass phrase" -or $($SSHKeyGenOutput -eq $null -and $ProcessKilled)) {

        $ValidSSHPrivateKeyFormat = $True

        $PasswordProtected = $True

    }

    [pscustomobject]@{

        ValidSSHPrivateKeyFormat        = $ValidSSHPrivateKeyFormat

        PasswordProtected               = $PasswordProtected

    }

}

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