tls12_check.ps1

tls12_check.ps1

# Copyright (C) Oliver 'kfsone' Smith ([email protected], https://www.kfs.org/oliver) 2021
#
# Trivial powershell script to test whether a given host is reachable and supports TLS 1.2.

Param(
  [Parameter(Mandatory=$true, ValueFromPipeline=$true, HelpMessage="Specify the dns name or ip address of the imap/tls server")]
  [String] $Server,
  [Parameter(HelpMessage="Specify the port number to contact, default 143")]
  [Int] $Port = 143
)

$has_tls12 = $false

$client = New-Object Net.Sockets.TcpClient
$client.Connect($Server, $Port)
$session = New-Object Net.Security.SslStream $client.GetStream(), $true, ([System.Net.Security.RemoteCertificateValidationCallback]{ $true })
$session.WriteTimeout = 10000
$session.ReadTimeout = 10000

try {
    $session.AuthenticateAsClient($Server, $null, "tls12", $false)
    $has_tls12 = $true
} catch {
  $has_tls12
}
$session.Dispose()
$client.Dispose()

echo "host:   $Server"
echo "port:   $port"
echo "tls1.2: $has_tls12"