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.

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import sys
import chilkat

listenSslSocket = chilkat.CkSocket()

#  Any string automatically begins a fully-functional 30-day trial.

success = listenSslSocket.UnlockComponent("Anything for 30-day trial")
if (success != True):
    print "Failed to unlock component"
    sys.exit()

#  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 (cert == None ):
    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 (clientSock == None ):
    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 (receivedMsg == None ):
    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)
clientSock.Close(20000)