WinSSH

0.9.2

Public/Install-WinSSH.ps1

                                <#

    .SYNOPSIS

        Install OpenSSH-Win64 and the associated ssh-agent service. Optionally install SSHD server and associated

        sshd service. Optionally install the latest PowerShell Core.

    .DESCRIPTION

        See .SYNOPSIS

    .NOTES

    .PARAMETER ConfigureSSHDOnLocalHost

        This parameter is OPTIONAL.

        This parameter is a switch. If used, the SSHD Server and associated sshd service will be installedm

        configured, and enabled on the local host.

    .PARAMETER RemoveHostPrivateKeys

        This parameter is OPTIONAL.

        This parameter is a switch. Use it to remove the Host Private Keys after they are added to the ssh-agent during

        sshd setup/config. Default is NOT to remove the host private keys.

        This parameter should only be used in combination with the -ConfigureSSHDOnLocalHost switch.

    .PARAMETER DefaultShell

        This parameter is OPTIONAL.

        This parameter takes a string that must be one of two values: "powershell","pwsh"

        If set to "powershell", when a Remote User connects to the local host via ssh, they will enter a

        Windows PowerShell 5.1 shell.

        If set to "pwsh", when a Remote User connects to the local host via ssh, the will enter a

        PowerShell Core 6 shell.

        If this parameter is NOT used, the Default shell will be cmd.exe.

        This parameter should only be used in combination with the -ConfigureSSHDOnLocalHost switch.

    .PARAMETER GiveWinSSHBinariesPathPriority

        This parameter is OPTIONAL, but highly recommended.

        This parameter is a switch. If used, ssh binaries installed as part of OpenSSH-Win64 installation will get

        priority in your $env:Path. This is especially useful if you have ssh binaries in your path from other

        program installs (like git).

    .PARAMETER GitHubInstall

        This parameter is OPTIONAL.

        This parameter is a switch. If used, OpenSSH binaries will be installed by downloading the .zip

        from https://github.com/PowerShell/Win32-OpenSSH/releases/latest/, expanding the archive, moving

        the files to the approproiate location(s), and setting permissions appropriately.

    .PARAMETER SkipWinCapabilityAttempt

        This parameter is OPTIONAL.

        This parameter is a switch.

        In more recent versions of Windows (Spring 2018), OpenSSH Client and SSHD Server can be installed as

        Windows Features using the Dism Module 'Add-WindowsCapability' cmdlet. If you run this function on

        a more recent version of Windows, it will attempt to use 'Add-WindowsCapability' UNLESS you use

        this switch.

        As of May 2018, there are reliability issues with the 'Add-WindowsCapability' cmdlet.

        Using this switch is highly recommend in order to avoid using 'Add-WindowsCapability'.

    .PARAMETER Force

        This parameter is a OPTIONAL.

        This parameter is a switch.

        If you are already running the latest version of OpenSSH, but would like to reinstall it and the

        associated ssh-agent service, use this switch.

    .EXAMPLE

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

        PS C:\Users\zeroadmin> Install-WinSSH -GiveWinSSHBinariesPathPriority -ConfigureSSHDOnLocalHost -DefaultShell powershell -GitHubInstall

#>

function Install-WinSSH {

    [CmdletBinding()]

    Param(

        [Parameter(Mandatory=$False)]

        [switch]$ConfigureSSHDOnLocalHost,

        [Parameter(Mandatory=$False)]

        [switch]$RemoveHostPrivateKeys,

        [Parameter(Mandatory=$False)]

        [ValidateSet("powershell","pwsh")]

        [string]$DefaultShell,

        # For situations where there may be more than one ssh.exe available on the system that are already part of $env:Path

        # or System PATH - for example, the ssh.exe that comes with Git

        [Parameter(Mandatory=$False)]

        [switch]$GiveWinSSHBinariesPathPriority,

        [Parameter(Mandatory=$False)]

        [switch]$GitHubInstall,

        [Parameter(Mandatory=$False)]

        [switch]$SkipWinCapabilityAttempt,

        [Parameter(Mandatory=$False)]

        [switch]$Force

    )

    ##### BEGIN Variable/Parameter Transforms and PreRun Prep #####

    if (!$(GetElevation)) {

        Write-Verbose "You must run PowerShell as Administrator before using this function! Halting!"

        Write-Error "You must run PowerShell as Administrator before using this function! Halting!"

        $global:FunctionResult = "1"

        return

    }

    if ($DefaultShell -and !$ConfigureSSHDOnLocalHost) {

        Write-Error "The -DefaultShell parameter is meant to set the configure the default shell for the SSHD Server. Please also use the -ConfigureSSHDOnLocalHost switch. Halting!"

        $global:FunctionResult = "1"

        return

    }

    $OpenSSHWinPath = "$env:ProgramFiles\OpenSSH-Win64"

    ##### END Variable/Parameter Transforms and PreRun Prep #####

    ##### BEGIN Main Body #####

    $InstallSSHAgentSplatParams = @{

        ErrorAction         = "SilentlyContinue"

        ErrorVariable       = "ISAErr"

    }

    if ($GitHubInstall) {

        $InstallSSHAgentSplatParams.Add("GitHubInstall",$True)

    }

    if ($SkipWinCapabilityAttempt) {

        $InstallSSHAgentSplatParams.Add("SkipWinCapabilityAttempt",$True)

    }

    if ($Force) {

        $InstallSSHAgentSplatParams.Add("Force",$True)

    }

    try {

        $InstallSSHAgentResult = Install-SSHAgentService @InstallSSHAgentSplatParams

        if (!$InstallSSHAgentResult) {throw "The Install-SSHAgentService function failed!"}

    }

    catch {

        Write-Error $_

        Write-Host "Errors for the Install-SSHAgentService function are as follows:"

        Write-Error $($ISAErr | Out-String)

        $global:FunctionResult = "1"

        return

    }

    Write-Host "Finished installing ssh-agent..." -ForegroundColor Green

    if ($ConfigureSSHDOnLocalHost) {

        $NewSSHDServerSplatParams = @{

            ErrorAction         = "SilentlyContinue"

            ErrorVariable       = "SSHDErr"

        }

        if ($RemoveHostPrivateKeys) {

            $NewSSHDServerSplatParams.Add("RemoveHostPrivateKeys",$True)

        }

        if ($DefaultShell) {

            $NewSSHDServerSplatParams.Add("DefaultShell",$DefaultShell)

        }

        if ($SkipWinCapabilityAttempt) {

            $NewSSHDServerSplatParams.Add("SkipWinCapabilityAttempt",$True)

        }

        try {

            $NewSSHDServerResult = New-SSHDServer @NewSSHDServerSplatParams

            if (!$NewSSHDServerResult) {throw "There was a problem with the New-SSHDServer function! Halting!"}

        }

        catch {

            Write-Error $_

            Write-Host "Errors for the New-SSHDServer function are as follows:"

            Write-Error $($SSHDErr | Out-String)

            $global:FunctionResult = "1"

            return

        }

    }

    # Update $env:Path to give the ssh.exe binary we just installed priority

    if ($GiveWinSSHBinariesPathPriority) {

        if ($($env:Path -split ";") -notcontains $OpenSSHWinPath) {

            if ($env:Path[-1] -eq ";") {

                $env:Path = "$OpenSSHWinPath;$env:Path"

            }

            else {

                $env:Path = "$OpenSSHWinPath;$env:Path"

            }

        }

    }

    else {

        if ($($env:Path -split ";") -notcontains $OpenSSHWinPath) {

            if ($env:Path[-1] -eq ";") {

                $env:Path = "$env:Path$OpenSSHWinPath"

            }

            else {

                $env:Path = "$env:Path;$OpenSSHWinPath"

            }

        }

    }

    $Output = [ordered]@{

        SSHAgentInstallInfo     = $InstallSSHAgentResult

    }

    if ($NewSSHDServerResult) {

        $Output.Add("SSHDServerInstallInfo",$NewSSHDServerResult)

    }

    if ($Output.Count -eq 1) {

        $InstallSSHAgentResult

    }

    else {

        [pscustomobject]$Output

    }

}

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