Perl Requires Chilkat v11.0.0+

Examine Client Certificates for an Accepted TLS Connection

See more Socket/SSL/TLS Examples

Demonstrates how to access the client certificates for a TLS connection accepted by your application acting as the server. Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

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

my $listenSslSocket = Chilkat2::Socket->new;

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

my $cert = Chilkat2::Cert->new;
my $success = $cert->LoadPfxFile('qa_data/serverCert/myServerCert.pfx', 'pfx_password');
if (!$success) {
    print $cert->LastErrorText, "\n";
    exit;
}

# 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->AddSslAcceptableClientCaDn('C=SE, O=AddTrust AB, OU=AddTrust External TTP Network, CN=AddTrust External CA Root');
$listenSslSocket->AddSslAcceptableClientCaDn('O=Digital Signature Trust Co., CN=DST Root CA X3');

# Initialize with our server's TLS certificate.
$success = $listenSslSocket->InitSslServer($cert);
if (!$success) {
    print $listenSslSocket->LastErrorText, "\n";
    exit;
}

# Bind and listen on a port:
my $myPort = 8123;
# Allow for a max of 5 queued connect requests.
my $backLog = 5;
$success = $listenSslSocket->BindAndListen($myPort, $backLog);
if (!$success) {
    print $listenSslSocket->LastErrorText, "\n";
    exit;
}

# Accept the next incoming connection.
my $maxWaitMillisec = 20000;

my $clientSock = Chilkat2::Socket->new;
$success = $listenSslSocket->AcceptNext($maxWaitMillisec, $clientSock);
if (!$success) {
    print $listenSslSocket->LastErrorText, "\n";
    exit;
}

# Examine the client certs chain.  The 1st cert will be the client certificate, and
# the subsequent certs will be the certs in the chain of authentication.
my $numClientCerts = $clientSock->NumReceivedClientCerts;
print 'numClientCerts = ', $numClientCerts, "\n";

my $clientCert = Chilkat2::Cert->new;
my $i = 0;
while ($i < $numClientCerts) {
    $clientSock->GetRcvdClientCert($i, $clientCert);
    print $clientCert->SubjectDN, "\n";
    $i = $i + 1;
}

# Close the connection with the client
$success = $clientSock->Close(1000);