WinSSH

0.8.3

Private/ConfigureGlobalKnownHosts.ps1

                                # The below ConfigureGlobalKnownHosts shouldn't be necesary with Public Key Authentication and

# dissemination of the CA public keys for both host and user signing

function ConfigureGlobalKnownHosts {

    [CmdletBinding()]

    Param(

        # Each Remote Host key should be in format like:

        # 192.168.2.34 ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCyPF3ERQhbKKt+BwQ ...

        [Parameter(Mandatory=$False)]

        [string[]]$RemoteHostKeys

    )

    if (Test-Path "$env:ProgramData\ssh") {

        $sshdir = "$env:ProgramData\ssh"

    }

    elseif (Test-Path "$env:ProgramFiles\OpenSSH-Win64") {

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

    }

    if (!$sshdir) {

        Write-Error "Unable to find either direcotry '$env:ProgramFiles\OpenSSH-Win64' or directory '$env:ProgramFiles\OpenSSH-Win64'! Halting!"

        $global:FunctionResult = "1"

        return

    }

    $SSHClientGlobalKnownHostsPath = "$sshdir\ssh_known_hosts"

    $sshClientGlobalConfigPath = "$sshdir\ssh_config"

    $GlobalKnownHostsOptionLine = "GlobalKnownHostsFile $SSHCLientGlobalKnownHostsPath"

    if (!(Test-Path "$sshdir\ssh_config")) {

        Set-Content -Value $GlobalKnownHostsOptionLine -Path $sshClientGlobalConfigPath

        #$SSHClientConfigContentChanged = $True

    }

    else {

        [System.Collections.ArrayList]$sshClientGlobalConfigContent = Get-Content $sshClientGlobalConfigPath

        # Determine if sshd_config already has the 'TrustedUserCAKeys' option active

        $ExistingGlobalKnownHostsFileOption = $sshClientGlobalConfigContent -match "GlobalKnownHostsFile" | Where-Object {$_ -notmatch "#"}

        if (!$ExistingGlobalKnownHostsFileOption) {

            try {

                Add-Content -Value $GlobalKnownHostsOptionLine -Path $sshClientGlobalConfigPath

                #$SSHClientConfigContentChanged = $True

                [System.Collections.ArrayList]$sshClientGlobalConfigContent = Get-Content $sshClientGlobalConfigPath

            }

            catch {

                Write-Error $_

                $global:FunctionResult = "1"

                return

            }

        }

        else {

            if ($ExistingGlobalKnownHostsFileOption -ne $GlobalKnownHostsOptionLine) {

                $UpdatedSSHClientConfig = $sshClientGlobalConfigContent -replace [regex]::Escape($ExistingGlobalKnownHostsFileOption),"$GlobalKnownHostsOptionLine"

                try {

                    Set-Content -Value $UpdatedSSHClientConfig -Path $sshClientGlobalConfigPath

                    #$SSHClientConfigContentChanged = $True

                    [System.Collections.ArrayList]$sshClientGlobalConfigContent = Get-Content $sshClientGlobalConfigPath

                }

                catch {

                    Write-Error $_

                    $global:FunctionResult = "1"

                    return

                }

            }

            else {

                Write-Warning "The specified 'GlobalKnownHostsFile' option is already active in the the ssh_config file. No changes made."

            }

        }

    }

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

        if ($RemoteHostKeys) {

            foreach ($PubKeyString in $RemoteHostKeys) {

                Add-Content -Value $PubKeyString.Trim() -Path $SSHClientGlobalKnownHostsPath

            }

        }

    }

    else {

        $CurrentGlobalKnownHostHeys = Get-Content $SSHClientGlobalKnownHostsPath

        if ($RemoteHostKeys) {

            foreach ($PubKeyString in $RemoteHostKeys) {

                if ($CurrentGlobalKnownHostHeys -notcontains $PubKeyString) {

                    Add-Content -Value $PubKeyString.Trim() -Path $SSHClientGlobalKnownHostsPath

                }

            }

        }

    }

    try {

        Restart-Service ssh-agent -Force -ErrorAction Stop

    }

    catch {

        Write-Error $_

        $global:FunctionResult = "1"

        return

    }

}

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