Lua Requires Chilkat v11.0.0+

Accept TLS Connection with Client Authentication

See more Socket/SSL/TLS Examples

Demonstrates how to accept a TLS connection requiring client authentication. This is the case where the TLS client sends a certificate. It is also known as "Two-Way SSL". Lua

local chilkat = require("chilkat")

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

local listenSslSocket = chilkat.Socket.new()

-- An SSL/TLS server needs a digital certificate.  This example loads it from a PFX file.
-- Note: This is the server's certificate.

local cert = chilkat.Cert.new()
-- The 1st argument is the file path, the 2nd arg is the
-- PFX file's password:
local success = cert:load_pfx_file("chilkat.pfx", "test")
if not success then
    print(cert.last_error_text)
    return
end

-- To accept client client certificates in the TLS handshake,
-- we must indicate a list of acceptable client certificate root CA DN's
-- that are allowed.  (DN is an acronym for Distinguished Name.)
-- Call AddSslAcceptableClientCaDn once for each acceptable CA DN.
-- Here are a few examples so you can see the general format of a DN.
listenSslSocket:add_ssl_acceptable_client_ca_dn("C=SE, O=AddTrust AB, OU=AddTrust External TTP Network, CN=AddTrust External CA Root")
listenSslSocket:add_ssl_acceptable_client_ca_dn("O=Digital Signature Trust Co., CN=DST Root CA X3")

-- Use the certificate:
success = listenSslSocket:init_ssl_server(cert)
if not success then
    print(listenSslSocket.last_error_text)
    return
end

-- Bind and listen on a port:
local myPort = 8123
-- Allow for a max of 5 queued connect requests.
local backLog = 5
success = listenSslSocket:bind_and_listen(myPort, backLog)
if not success then
    print(listenSslSocket.last_error_text)
    return
end

-- 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
-- AcceptNext can hang indefinitely during the SSL handshake process.
-- Make sure these properties are set to appropriate values before calling AcceptNext.

-- Set a 10 second max for waiting to read/write.  This is for the SSL/TLS handshake establishment.
listenSslSocket.max_read_idle_ms = 10000
listenSslSocket.max_send_idle_ms = 10000

-- Accept a single client connection and establish the secure SSL/TLS channel:
local maxWaitMillisec = 20000
local clientSock = chilkat.Socket.new()
success = listenSslSocket:accept_next(maxWaitMillisec, clientSock)
if not success then
    print(listenSslSocket.last_error_text)
    return
end

-- The client (in this example) is going to send a "Hello Server! -EOM-"
-- message.  Read it:
local receivedMsg = clientSock:receive_until_match("-EOM-")
if not clientSock.last_method_success then
    print(clientSock.last_error_text)
    return
end

print(receivedMsg)

-- Send a "Hello Client! -EOM-" message:
success = clientSock:send_string("Hello Client! -EOM-")
if not success then
    print(clientSock.last_error_text)
    return
end

-- Close the connection with the client
-- Wait a max of 20 seconds (20000 millsec)
success = clientSock:close(20000)