The accept() method of SSLSocket in Python

Method Name:

Method Signature:

accept()

Parameters:

None

Return Value:

A tuple containing an SSLSocket instance and the IP address of the client. The SSLSocket instance can be used to communicate with the client using TLS.

Overview:

The method accept(), accepts a connection request from a client.
The method accept() returns a tuple of SSLSocket and the IP address of the client.
The first element of the tuple, which is an instance of SSLSocket that can be used for communicating with the client in a secure manner as per TLS protocol.
The client program used in the Introduction to SSLSocket, can be used for communicating with the server below.

Example:

# Example Python program that accepts new TLS connections
# from clients through accept() method of SSLSocket class
import socket
import ssl
import platform
import certifi
import os

# Create an SSL context
context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)

# Load CA certificate with which the server will
# validate the client certificate
context.load_verify_locations("./DemoCA.pem")

# Load server certificate
context.load_cert_chain(certfile="./DemoSvr.pem",
keyfile="./DemoSvr.key")

# Work-around for self-signed certificates as Python3.13 is strict
# about them
context.verify_flags = context.verify_flags & ~ssl.VERIFY_X509_STRICT
context.verify_mode = ssl.CERT_REQUIRED

# Create a connection oriented server socket
ipAddress = "127.0.0.1"
portNumber = 15001
serverSocket = socket.socket(family=socket.AF_INET, type=socket.SOCK_STREAM)

# Wrap the socket to get an SSLSocket and bind it to an IP address and port
secureServerSocket = context.wrap_socket(serverSocket,
server_side = True)

secureServerSocket.bind((ipAddress, portNumber))
secureServerSocket.listen()

print("Listening and accepting connections")
try:
while(True):
(clientConnection, clientAddress) = secureServerSocket.accept()
print("Serving connection request from:")
print(clientAddress)
clientConnection.sendall("hi there".encode(errors='ignore'))
clientConnection.close()
except KeyboardInterrupt:
print("Server exiting")
serverSocket.close()
secureServerSocket.close()

Output-Server:

Listening and accepting connections
Serving connection request from:
('127.0.0.1', 62333)
^CServer exiting

Output-Client:

X.509 certificate of the server DemoServer:
{'subject': ((('countryName', 'IN'),), (('stateOrProvinceName', 'KA'),), (('localityName', 'BLR'),), (('organizationName', 'DemoServerOrg'),), (('organizationalUnitName', 'DemoServerUnit'),), (('commonName', 'DemoServer'),), (('emailAddress', 'demoserver@demoservertesting.com'),)), 'issuer': ((('countryName', 'IN'),), (('stateOrProvinceName', 'KA'),), (('localityName', 'BLR'),), (('organizationName', 'DemoCAOrg'),), (('organizationalUnitName', 'DemoCAUnit'),), (('commonName', 'localca'),), (('emailAddress', 'localca@localcatest.com'),)), 'version': 1, 'serialNumber': '01', 'notBefore': 'Sep 22 10:44:04 2025 GMT', 'notAfter': 'Sep 22 10:44:04 2026 GMT'}
Secure communication received from server:hi there