Ejercicios de seguridad: simular el funcionamiento de un proxy caché mediante una conexión UDP entre un cliente y un servidor que solicitan una imagen y si la imagen ya se ha descargado se indica en un mensaje | Operating systems, scripting, PowerShell and security

Contenidos

Servidor
Cliente

Servidor

##Server
$port=2020
$endpoint = new-object System.Net.IPEndPoint ([IPAddress]::Any,$port)
$udpclient=new-Object System.Net.Sockets.UdpClient $port
$content=$udpclient.Receive([ref]$endpoint)
$udpclient.Close()
$imagen = [Text.Encoding]::ASCII.GetString($content)
if(Test-Path $imagen)
{
    $port=2020
    $endpoint = new-object System.Net.IPEndPoint ([IPAddress]::Loopback,$port)
    $udpclient=new-Object System.Net.Sockets.UdpClient
    $b=[Text.Encoding]::ASCII.GetBytes('esta perro')
    $bytesSent=$udpclient.Send($b,$b.length,$endpoint)
    $udpclient.Close()
}
else
{
    iwr "https://www.jesusninoc.com/wp-content/uploads/2017/01/Cliente-Ejecutar-un-cmdlet-remotamente-en-un-equipos-utilizando-sockets-UDP.png" -OutFile perro.jpg
    $port=2020
    $endpoint = new-object System.Net.IPEndPoint ([IPAddress]::Loopback,$port)
    $udpclient=new-Object System.Net.Sockets.UdpClient
    $b=[Text.Encoding]::ASCII.GetBytes('no estaba perro')
    $bytesSent=$udpclient.Send($b,$b.length,$endpoint)
    $udpclient.Close()
}

##Server

$port=2020

$endpoint = new-object System.Net.IPEndPoint ([IPAddress]::Any,$port)

$udpclient=new-Object System.Net.Sockets.UdpClient $port

$content=$udpclient.Receive([ref]$endpoint)

$udpclient.Close()

$imagen = [Text.Encoding]::ASCII.GetString($content)

if(Test-Path $imagen)

{

$port=2020

$endpoint = new-object System.Net.IPEndPoint ([IPAddress]::Loopback,$port)

$udpclient=new-Object System.Net.Sockets.UdpClient

$b=[Text.Encoding]::ASCII.GetBytes('esta perro')

$bytesSent=$udpclient.Send($b,$b.length,$endpoint)

$udpclient.Close()

}

else

{

iwr "https://www.jesusninoc.com/wp-content/uploads/2017/01/Cliente-Ejecutar-un-cmdlet-remotamente-en-un-equipos-utilizando-sockets-UDP.png" -OutFile perro.jpg

$port=2020

$endpoint = new-object System.Net.IPEndPoint ([IPAddress]::Loopback,$port)

$udpclient=new-Object System.Net.Sockets.UdpClient

$b=[Text.Encoding]::ASCII.GetBytes('no estaba perro')

$bytesSent=$udpclient.Send($b,$b.length,$endpoint)

$udpclient.Close()

}

Cliente

##Client
$port=2020
$endpoint = new-object System.Net.IPEndPoint ([IPAddress]::Loopback,$port)
$udpclient=new-Object System.Net.Sockets.UdpClient
$b=[Text.Encoding]::ASCII.GetBytes('perro.jpg')
$bytesSent=$udpclient.Send($b,$b.length,$endpoint)
$udpclient.Close()

$port=2020
$endpoint = new-object System.Net.IPEndPoint ([IPAddress]::Any,$port)
$udpclient=new-Object System.Net.Sockets.UdpClient $port
$content=$udpclient.Receive([ref]$endpoint)
$udpclient.Close()
$imagen = [Text.Encoding]::ASCII.GetString($content)
$imagen

##Client

$port=2020

$endpoint = new-object System.Net.IPEndPoint ([IPAddress]::Loopback,$port)

$udpclient=new-Object System.Net.Sockets.UdpClient

$b=[Text.Encoding]::ASCII.GetBytes('perro.jpg')

$bytesSent=$udpclient.Send($b,$b.length,$endpoint)

$udpclient.Close()

$port=2020

$endpoint = new-object System.Net.IPEndPoint ([IPAddress]::Any,$port)

$udpclient=new-Object System.Net.Sockets.UdpClient $port

$content=$udpclient.Receive([ref]$endpoint)

$udpclient.Close()

$imagen = [Text.Encoding]::ASCII.GetString($content)

$imagen

Publicado el día 15 de enero de 2021

CATEGORÍAS

PowerShell, Red

ETIQUETAS

.NET, ASCII.GetBytes, client, Ejercicios de seguridad, HTTP, HTTPS, iOS, IP, IPAddress, iw, iwr, Jesús Niño, Jesús Niño Camazón, Length, New-Object, Path, Proxy, Server, socket, Sockets, System.Net.IPEndPoint, System.Net.Sockets.UdpClient, Text.Encoding, UDP

Servidor

Cliente

CATEGORÍAS

ETIQUETAS

MÁS