The Version() Method Of SSLSocket Class From The Python Ssl Module

Method Name:

SSLSocket.version

Method Signature:

SSLSocket.version()

Parameters:

None

Return Value:

The version of the SSL protocol obtained during the SSL handshake. The value is from the set of protocol values {"SSLv2", "SSLv3", "TLSv1", "TLSv1.1", "TLSv1.2", "TLSv1.3"} 

 

Overview:

  • When an SSL connection is established between two machines in the network, several parameters are established like
    • Protocol version
    • Cipher Suite
    • Compression Method

which will be used for the communication.

  • The method SSLSocket.version() returns the version of the SSL protocol to be used in the communication between two SSL sockets.

Example:

# Example Python program that prints the SSL

# protocol version used on an established SSL connection

import ssl

import socket

import os

import platform

 

# Create an SSL context

context = ssl.SSLContext();

 

context.verify_mode     = ssl.CERT_REQUIRED;

context.check_hostname  = True;

 

context.load_default_certs();

 

# Check for OS X platform

if platform.system().lower() == 'darwin':

    import certifi

    context.load_verify_locations(

        cafile=os.path.relpath(certifi.where()),

        capath=None,

        cadata=None);

 

# Create a streaming socket

con = socket.socket(socket.AF_INET, socket.SOCK_STREAM);   

 

# Create a secure socket

secure_con          = context.wrap_socket(con, server_hostname="example.org");

protocol_version    = secure_con.version();

 

print("The SSL protocol version before calling SSLSocket.connect() is:");

print(protocol_version);

 

# Connect to host

secure_con.connect(("example.org", 443));

 

# Find the SSL protocol version obtained after SSL handshake

protocol_version = secure_con.version();

print("The SSL protocol version after calling SSLSocket.connect() is:");

print(protocol_version);

 

Output:

The SSL protocol version before calling SSLSocket.connect() is:

None

The SSL protocol version after calling SSLSocket.connect() is:

TLSv1.3

 


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