LG

J'ai trouvé 3 documents qui je trouve présente bien notre affaire. C'est détaillé plutôt dans le contenu des trames.

Les principes, Archive

En plus poussé avec des dump Wireshark, Archive

Déchiffer du SSL (quand on connait la clé privée), Archive

Voir aussi les implémentations dans la partie chiffrement.

Ce script teste toutes les suites cryptographiques connues par openssl sur le poste client et donne le résultat de la communication avec le serveur distant.

Source, Archive

Paramètre 1 : l'adresse IP (ou le nom de domaine), Paramètre 2 : le port (443)

bash

#!/usr/bin/env bash
 
# OpenSSL requires the port number.
SERVER=$1:$2
DELAY=1
ciphers=$(openssl ciphers 'ALL:eNULL' | sed -e 's/:/ /g')
 
echo Obtaining cipher list from $(openssl version).
 
for cipher in ${ciphers[@]}
do
echo -n Testing $cipher...
result=$(echo -n | openssl s_client -cipher "$cipher" -connect $SERVER 2>&1)
if [[ "$result" =~ ":error:" ]] ; then
  error=$(echo -n $result | cut -d':' -f6)
  echo NO \($error\)
else
  if [[ "$result" =~ "Cipher is ${cipher}" || "$result" =~ "Cipher    :" ]] ; then
    echo YES
  else
    echo UNKNOWN RESPONSE
    echo $result
  fi
fi
sleep $DELAY
done

Exemple avec google.fr:443 :

Obtaining cipher list from OpenSSL 1.0.2l 25 May 2017.
Testing ECDHE-RSA-AES256-GCM-SHA384...YES
Testing ECDHE-ECDSA-AES256-GCM-SHA384...NO (sslv3 alert handshake failure)
Testing ECDHE-RSA-AES256-SHA384...NO (sslv3 alert handshake failure)
Testing ECDHE-ECDSA-AES256-SHA384...NO (sslv3 alert handshake failure)
Testing ECDHE-RSA-AES256-SHA...YES
Testing ECDHE-ECDSA-AES256-SHA...NO (sslv3 alert handshake failure)
Testing SRP-DSS-AES-256-CBC-SHA...NO (no ciphers available)
Testing SRP-RSA-AES-256-CBC-SHA...NO (no ciphers available)
Testing SRP-AES-256-CBC-SHA...NO (no ciphers available)
Testing DH-DSS-AES256-GCM-SHA384...NO (sslv3 alert handshake failure)
Testing DHE-DSS-AES256-GCM-SHA384...NO (sslv3 alert handshake failure)
Testing DH-RSA-AES256-GCM-SHA384...NO (sslv3 alert handshake failure)
Testing DHE-RSA-AES256-GCM-SHA384...NO (sslv3 alert handshake failure)
Testing DHE-RSA-AES256-SHA256...NO (sslv3 alert handshake failure)
Testing DHE-DSS-AES256-SHA256...NO (sslv3 alert handshake failure)
Testing DH-RSA-AES256-SHA256...NO (sslv3 alert handshake failure)
Testing DH-DSS-AES256-SHA256...NO (sslv3 alert handshake failure)
Testing DHE-RSA-AES256-SHA...NO (sslv3 alert handshake failure)
Testing DHE-DSS-AES256-SHA...NO (sslv3 alert handshake failure)
Testing DH-RSA-AES256-SHA...NO (sslv3 alert handshake failure)
Testing DH-DSS-AES256-SHA...NO (sslv3 alert handshake failure)
Testing DHE-RSA-CAMELLIA256-SHA...NO (sslv3 alert handshake failure)
Testing DHE-DSS-CAMELLIA256-SHA...NO (sslv3 alert handshake failure)
Testing DH-RSA-CAMELLIA256-SHA...NO (sslv3 alert handshake failure)
Testing DH-DSS-CAMELLIA256-SHA...NO (sslv3 alert handshake failure)
Testing AECDH-AES256-SHA...NO (sslv3 alert handshake failure)
Testing ADH-AES256-GCM-SHA384...NO (sslv3 alert handshake failure)
Testing ADH-AES256-SHA256...NO (sslv3 alert handshake failure)
Testing ADH-AES256-SHA...NO (sslv3 alert handshake failure)
Testing ADH-CAMELLIA256-SHA...NO (sslv3 alert handshake failure)
Testing ECDH-RSA-AES256-GCM-SHA384...NO (sslv3 alert handshake failure)
Testing ECDH-ECDSA-AES256-GCM-SHA384...NO (sslv3 alert handshake failure)
Testing ECDH-RSA-AES256-SHA384...NO (sslv3 alert handshake failure)
Testing ECDH-ECDSA-AES256-SHA384...NO (sslv3 alert handshake failure)
Testing ECDH-RSA-AES256-SHA...NO (sslv3 alert handshake failure)
Testing ECDH-ECDSA-AES256-SHA...NO (sslv3 alert handshake failure)
Testing AES256-GCM-SHA384...YES
Testing AES256-SHA256...NO (sslv3 alert handshake failure)
Testing AES256-SHA...YES
Testing CAMELLIA256-SHA...NO (sslv3 alert handshake failure)
Testing PSK-AES256-CBC-SHA...NO (no ciphers available)
Testing ECDHE-RSA-AES128-GCM-SHA256...YES
Testing ECDHE-ECDSA-AES128-GCM-SHA256...NO (sslv3 alert handshake failure)
Testing ECDHE-RSA-AES128-SHA256...NO (sslv3 alert handshake failure)
Testing ECDHE-ECDSA-AES128-SHA256...NO (sslv3 alert handshake failure)
Testing ECDHE-RSA-AES128-SHA...YES
Testing ECDHE-ECDSA-AES128-SHA...NO (sslv3 alert handshake failure)
Testing SRP-DSS-AES-128-CBC-SHA...NO (no ciphers available)
Testing SRP-RSA-AES-128-CBC-SHA...NO (no ciphers available)
Testing SRP-AES-128-CBC-SHA...NO (no ciphers available)
Testing DH-DSS-AES128-GCM-SHA256...NO (sslv3 alert handshake failure)
Testing DHE-DSS-AES128-GCM-SHA256...NO (sslv3 alert handshake failure)
Testing DH-RSA-AES128-GCM-SHA256...NO (sslv3 alert handshake failure)
Testing DHE-RSA-AES128-GCM-SHA256...NO (sslv3 alert handshake failure)
Testing DHE-RSA-AES128-SHA256...NO (sslv3 alert handshake failure)
Testing DHE-DSS-AES128-SHA256...NO (sslv3 alert handshake failure)
Testing DH-RSA-AES128-SHA256...NO (sslv3 alert handshake failure)
Testing DH-DSS-AES128-SHA256...NO (sslv3 alert handshake failure)
Testing DHE-RSA-AES128-SHA...NO (sslv3 alert handshake failure)
Testing DHE-DSS-AES128-SHA...NO (sslv3 alert handshake failure)
Testing DH-RSA-AES128-SHA...NO (sslv3 alert handshake failure)
Testing DH-DSS-AES128-SHA...NO (sslv3 alert handshake failure)
Testing DHE-RSA-SEED-SHA...NO (sslv3 alert handshake failure)
Testing DHE-DSS-SEED-SHA...NO (sslv3 alert handshake failure)
Testing DH-RSA-SEED-SHA...NO (sslv3 alert handshake failure)
Testing DH-DSS-SEED-SHA...NO (sslv3 alert handshake failure)
Testing DHE-RSA-CAMELLIA128-SHA...NO (sslv3 alert handshake failure)
Testing DHE-DSS-CAMELLIA128-SHA...NO (sslv3 alert handshake failure)
Testing DH-RSA-CAMELLIA128-SHA...NO (sslv3 alert handshake failure)
Testing DH-DSS-CAMELLIA128-SHA...NO (sslv3 alert handshake failure)
Testing AECDH-AES128-SHA...NO (sslv3 alert handshake failure)
Testing ADH-AES128-GCM-SHA256...NO (sslv3 alert handshake failure)
Testing ADH-AES128-SHA256...NO (sslv3 alert handshake failure)
Testing ADH-AES128-SHA...NO (sslv3 alert handshake failure)
Testing ADH-SEED-SHA...NO (sslv3 alert handshake failure)
Testing ADH-CAMELLIA128-SHA...NO (sslv3 alert handshake failure)
Testing ECDH-RSA-AES128-GCM-SHA256...NO (sslv3 alert handshake failure)
Testing ECDH-ECDSA-AES128-GCM-SHA256...NO (sslv3 alert handshake failure)
Testing ECDH-RSA-AES128-SHA256...NO (sslv3 alert handshake failure)
Testing ECDH-ECDSA-AES128-SHA256...NO (sslv3 alert handshake failure)
Testing ECDH-RSA-AES128-SHA...NO (sslv3 alert handshake failure)
Testing ECDH-ECDSA-AES128-SHA...NO (sslv3 alert handshake failure)
Testing AES128-GCM-SHA256...YES
Testing AES128-SHA256...NO (sslv3 alert handshake failure)
Testing AES128-SHA...YES
Testing SEED-SHA...NO (sslv3 alert handshake failure)
Testing CAMELLIA128-SHA...NO (sslv3 alert handshake failure)
Testing IDEA-CBC-SHA...NO (sslv3 alert handshake failure)
Testing PSK-AES128-CBC-SHA...NO (no ciphers available)
Testing KRB5-IDEA-CBC-SHA...NO (no ciphers available)
Testing KRB5-IDEA-CBC-MD5...NO (no ciphers available)
Testing ECDHE-RSA-RC4-SHA...NO (sslv3 alert handshake failure)
Testing ECDHE-ECDSA-RC4-SHA...NO (sslv3 alert handshake failure)
Testing AECDH-RC4-SHA...NO (sslv3 alert handshake failure)
Testing ADH-RC4-MD5...NO (sslv3 alert handshake failure)
Testing ECDH-RSA-RC4-SHA...NO (sslv3 alert handshake failure)
Testing ECDH-ECDSA-RC4-SHA...NO (sslv3 alert handshake failure)
Testing RC4-SHA...NO (sslv3 alert handshake failure)
Testing RC4-MD5...NO (sslv3 alert handshake failure)
Testing PSK-RC4-SHA...NO (no ciphers available)
Testing KRB5-RC4-SHA...NO (no ciphers available)
Testing KRB5-RC4-MD5...NO (no ciphers available)
Testing ECDHE-RSA-DES-CBC3-SHA...NO (sslv3 alert handshake failure)
Testing ECDHE-ECDSA-DES-CBC3-SHA...NO (sslv3 alert handshake failure)
Testing SRP-DSS-3DES-EDE-CBC-SHA...NO (no ciphers available)
Testing SRP-RSA-3DES-EDE-CBC-SHA...NO (no ciphers available)
Testing SRP-3DES-EDE-CBC-SHA...NO (no ciphers available)
Testing EDH-RSA-DES-CBC3-SHA...NO (sslv3 alert handshake failure)
Testing EDH-DSS-DES-CBC3-SHA...NO (sslv3 alert handshake failure)
Testing DH-RSA-DES-CBC3-SHA...NO (sslv3 alert handshake failure)
Testing DH-DSS-DES-CBC3-SHA...NO (sslv3 alert handshake failure)
Testing AECDH-DES-CBC3-SHA...NO (sslv3 alert handshake failure)
Testing ADH-DES-CBC3-SHA...NO (sslv3 alert handshake failure)
Testing ECDH-RSA-DES-CBC3-SHA...NO (sslv3 alert handshake failure)
Testing ECDH-ECDSA-DES-CBC3-SHA...NO (sslv3 alert handshake failure)
Testing DES-CBC3-SHA...YES
Testing PSK-3DES-EDE-CBC-SHA...NO (no ciphers available)
Testing KRB5-DES-CBC3-SHA...NO (no ciphers available)
Testing KRB5-DES-CBC3-MD5...NO (no ciphers available)
Testing ECDHE-RSA-NULL-SHA...NO (sslv3 alert handshake failure)
Testing ECDHE-ECDSA-NULL-SHA...NO (sslv3 alert handshake failure)
Testing AECDH-NULL-SHA...NO (sslv3 alert handshake failure)
Testing ECDH-RSA-NULL-SHA...NO (sslv3 alert handshake failure)
Testing ECDH-ECDSA-NULL-SHA...NO (sslv3 alert handshake failure)
Testing NULL-SHA256...NO (sslv3 alert handshake failure)
Testing NULL-SHA...NO (sslv3 alert handshake failure)
Testing NULL-MD5...NO (sslv3 alert handshake failure)

De ce que j'ai compris :

• no ciphers available signifie que le serveur distant n'implémente pas cette suite,
• sslv3 alert handshake failure indique que le serveur distant a volontairement coupé la communication pendant la poignée de main. Il est probable que la suite cryptographique a été considérée comme peu fiable et donc désactivée.