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CkPython Examples

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(CkPython) SSL Server Example

Demonstrates how to create an SSL socket for accepting connections. This example is *very* simple in that it will create an SSL socket for accepting a single connection. It will read a message from the client, send a reply, and exit.

Chilkat Python Downloads

Python Module for Windows, Linux, Alpine Linux,
MAC OS X, Solaris, FreeBSD, OpenBSD,
Raspberry Pi and other single board computers

import sys
import chilkat

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

listenSslSocket = chilkat.CkSocket()

# An SSL server needs a digital certificate.  This example loads it from a PFX file.

# Create an instance of a certificate store object, load a PFX file,
# locate the certificate we need, and use it.
# (a PFX file may contain more than one certificate.)
certStore = chilkat.CkCertStore()
# The 1st argument is the filename, the 2nd arg is the 
# PFX file's password:
success = certStore.LoadPfxFile("chilkat.pfx","test")
if (success != True):
    print(certStore.lastErrorText())
    sys.exit()

# Find the certificate to be used for SSL:

# cert is a CkCert
cert = certStore.FindCertBySubject("Chilkat Software, Inc.")
if (certStore.get_LastMethodSuccess() == False):
    print(certStore.lastErrorText())
    sys.exit()

# Use the certificate:
success = listenSslSocket.InitSslServer(cert)
if (success != True):

    print(listenSslSocket.lastErrorText())
    sys.exit()

# Bind and listen on a port:
myPort = 8123
# Allow for a max of 5 queued connect requests.
backLog = 5
success = listenSslSocket.BindAndListen(myPort,backLog)
if (success != True):
    print(listenSslSocket.lastErrorText())
    sys.exit()

# If accepting an SSL/TLS connection, the SSL handshake is part of the connection
# establishment process. This involves a few back-and-forth messages between the 
# client and server to establish algorithms and a shared key to create the secure 
# channel. The sending and receiving of these messages are governed by the 
# MaxReadIdleMs and MaxSendIdleMs properties. If these properties are set to 0 
# (and this is the default unless changed by your application), then the 
# AcceptNextConnection can hang indefinitely during the SSL handshake process. 
# Make sure these properties are set to appropriate values before calling AcceptNextConnection.

# Set a 10 second max for waiting to read/write.  This is for the SSL/TLS handshake establishment.
listenSslSocket.put_MaxReadIdleMs(10000)
listenSslSocket.put_MaxSendIdleMs(10000)

# Accept a single client connection and establish the secure SSL/TLS channel:

maxWaitMillisec = 20000
# clientSock is a CkSocket
clientSock = listenSslSocket.AcceptNextConnection(maxWaitMillisec)
if (listenSslSocket.get_LastMethodSuccess() == False):
    print(listenSslSocket.lastErrorText())
    sys.exit()

# The client (in this example) is going to send a "Hello Server! -EOM-" 
# message.  Read it:
receivedMsg = clientSock.receiveUntilMatch("-EOM-")
if (clientSock.get_LastMethodSuccess() != True):
    print(clientSock.lastErrorText())
    sys.exit()

print(receivedMsg)

# Send a "Hello Client! -EOM-" message:
success = clientSock.SendString("Hello Client! -EOM-")
if (success != True):
    print(clientSock.lastErrorText())
    sys.exit()

# Close the connection with the client
# Wait a max of 20 seconds (20000 millsec)
success = clientSock.Close(20000)


 

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