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diff --git a/openvpn/sample-scripts/auth-pam.pl b/openvpn/sample-scripts/auth-pam.pl
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+++ b/openvpn/sample-scripts/auth-pam.pl
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+#!/usr/bin/perl -t
+
+# OpenVPN PAM AUTHENTICATON
+#   This script can be used to add PAM-based authentication
+#   to OpenVPN 2.0.  The OpenVPN client must provide
+#   a username/password, using the --auth-user-pass directive.
+#   The OpenVPN server should specify --auth-user-pass-verify
+#   with this script as the argument and the 'via-file' method
+#   specified.  The server can also optionally specify
+#   --client-cert-not-required and/or --username-as-common-name.
+
+# SCRIPT OPERATION
+#   Return success or failure status based on whether or not a
+#   given username/password authenticates using PAM.
+#   Caller should write username/password as two lines in a file
+#   which is passed to this script as a command line argument.
+
+# CAVEATS
+#   * Requires Authen::PAM module, which may also
+#     require the pam-devel package.
+#   * May need to be run as root in order to
+#     access username/password file.
+
+# NOTES
+#   * This script is provided mostly as a demonstration of the
+#     --auth-user-pass-verify script capability in OpenVPN.
+#     For real world usage, see the auth-pam module in the plugin
+#     folder.
+
+use Authen::PAM;
+use POSIX;
+
+# This "conversation function" will pass
+# $password to PAM when it asks for it.
+
+sub my_conv_func {
+    my @res;
+    while ( @_ ) {
+        my $code = shift;
+        my $msg = shift;
+        my $ans = "";
+
+        $ans = $password if $msg =~ /[Pp]assword/;
+
+        push @res, (PAM_SUCCESS(),$ans);
+    }
+    push @res, PAM_SUCCESS();
+    return @res;
+}
+
+# Identify service type to PAM
+$service = "login";
+
+# Get username/password from file
+
+if ($ARG = shift @ARGV) {
+    if (!open (UPFILE, "<$ARG")) {
+	print "Could not open username/password file: $ARG\n";
+	exit 1;
+    }
+} else {
+    print "No username/password file specified on command line\n";
+    exit 1;
+}
+
+$username = <UPFILE>;
+$password = <UPFILE>;
+
+if (!$username || !$password) {
+    print "Username/password not found in file: $ARG\n";
+    exit 1;
+}
+
+chomp $username;
+chomp $password;
+
+close (UPFILE);
+
+# Initialize PAM object
+
+if (!ref($pamh = new Authen::PAM($service, $username, \&my_conv_func))) {
+    print "Authen::PAM init failed\n";
+    exit 1;
+}
+
+# Authenticate with PAM
+
+$res = $pamh->pam_authenticate;
+
+# Return success or failure
+
+if ($res == PAM_SUCCESS()) {
+    exit 0;
+} else {
+    print "Auth '$username' failed, PAM said: ", $pamh->pam_strerror($res), "\n";
+    exit 1;
+}