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<?php
/*
	vpn_l2tp.php
	part of pfSense

	Copyright (C) 2005 Scott Ullrich (sullrich@gmail.com)
	Copyright (C) 2013-2015 Electric Sheep Fencing, LP
	All rights reserved.

	Redistribution and use in source and binary forms, with or without
	modification, are permitted provided that the following conditions are met:

	1. Redistributions of source code must retain the above copyright notice,
	   this list of conditions and the following disclaimer.

	2. Redistributions in binary form must reproduce the above copyright
	   notice, this list of conditions and the following disclaimer in the
	   documentation and/or other materials provided with the distribution.

	THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
	INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
	AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
	AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
	OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	POSSIBILITY OF SUCH DAMAGE.
*/

##|+PRIV
##|*IDENT=page-vpn-vpnl2tp
##|*NAME=VPN: VPN L2TP page
##|*DESCR=Allow access to the 'VPN: VPN L2TP' page.
##|*MATCH=vpn_l2tp.php*
##|-PRIV

$pgtitle = array(gettext("VPN"), gettext("L2TP"), gettext("L2TP"));
$shortcut_section = "l2tps";

require("guiconfig.inc");
require_once("vpn.inc");

if (!is_array($config['l2tp']['radius'])) {
	$config['l2tp']['radius'] = array();
}
$l2tpcfg = &$config['l2tp'];

$pconfig['remoteip'] = $l2tpcfg['remoteip'];
$pconfig['localip'] = $l2tpcfg['localip'];
$pconfig['l2tp_subnet'] = $l2tpcfg['l2tp_subnet'];
$pconfig['mode'] = $l2tpcfg['mode'];
$pconfig['interface'] = $l2tpcfg['interface'];
$pconfig['l2tp_dns1'] = $l2tpcfg['dns1'];
$pconfig['l2tp_dns2'] = $l2tpcfg['dns2'];
$pconfig['wins'] = $l2tpcfg['wins'];
$pconfig['radiusenable'] = isset($l2tpcfg['radius']['enable']);
$pconfig['radacct_enable'] = isset($l2tpcfg['radius']['accounting']);
$pconfig['radiusserver'] = $l2tpcfg['radius']['server'];
$pconfig['radiussecret'] = $l2tpcfg['radius']['secret'];
$pconfig['radiusissueips'] = $l2tpcfg['radius']['radiusissueips'];
$pconfig['n_l2tp_units'] = $l2tpcfg['n_l2tp_units'];
$pconfig['paporchap'] = $l2tpcfg['paporchap'];
$pconfig['secret'] = $l2tpcfg['secret'];

if ($_POST) {

	unset($input_errors);
	$pconfig = $_POST;

	/* input validation */
	if ($_POST['mode'] == "server") {
		$reqdfields = explode(" ", "localip remoteip");
		$reqdfieldsn = array(gettext("Server address"),gettext("Remote start address"));

		if ($_POST['radiusenable']) {
			$reqdfields = array_merge($reqdfields, explode(" ", "radiusserver radiussecret"));
			$reqdfieldsn = array_merge($reqdfieldsn,
				array(gettext("RADIUS server address"),gettext("RADIUS shared secret")));
		}

		do_input_validation($_POST, $reqdfields, $reqdfieldsn, $input_errors);

		if (($_POST['localip'] && !is_ipaddr($_POST['localip']))) {
			$input_errors[] = gettext("A valid server address must be specified.");
		}
		if (is_ipaddr_configured($_POST['localip'])) {
			$input_errors[] = gettext("'Server address' parameter should NOT be set to any IP address currently in use on this firewall.");
		}
		if (($_POST['l2tp_subnet'] && !is_ipaddr($_POST['remoteip']))) {
			$input_errors[] = gettext("A valid remote start address must be specified.");
		}
		if (($_POST['radiusserver'] && !is_ipaddr($_POST['radiusserver']))) {
			$input_errors[] = gettext("A valid RADIUS server address must be specified.");
		}

		/* if this is an AJAX caller then handle via JSON */
		if(isAjax() && is_array($input_errors)) {
			input_errors2Ajax($input_errors);
			exit;
		}

		if (!$input_errors) {
			$_POST['remoteip'] = $pconfig['remoteip'] = gen_subnet($_POST['remoteip'], $_POST['l2tp_subnet']);
			$subnet_start = ip2ulong($_POST['remoteip']);
			$subnet_end = ip2ulong($_POST['remoteip']) + $_POST['n_l2tp_units'] - 1;

			if ((ip2ulong($_POST['localip']) >= $subnet_start) &&
			    (ip2ulong($_POST['localip']) <= $subnet_end)) {
				$input_errors[] = gettext("The specified server address lies in the remote subnet.");
			}
			if ($_POST['localip'] == get_interface_ip("lan")) {
				$input_errors[] = gettext("The specified server address is equal to the LAN interface address.");
			}
		}
	}

	/* if this is an AJAX caller then handle via JSON */
	if(isAjax() && is_array($input_errors)) {
		input_errors2Ajax($input_errors);
		exit;
	}

	if (!$input_errors) {
		$l2tpcfg['remoteip'] = $_POST['remoteip'];
		$l2tpcfg['localip'] = $_POST['localip'];
		$l2tpcfg['l2tp_subnet'] = $_POST['l2tp_subnet'];
		$l2tpcfg['mode'] = $_POST['mode'];
		$l2tpcfg['interface'] = $_POST['interface'];
		$l2tpcfg['n_l2tp_units'] = $_POST['n_l2tp_units'];

		$l2tpcfg['radius']['server'] = $_POST['radiusserver'];
		$l2tpcfg['radius']['secret'] = $_POST['radiussecret'];
		$l2tpcfg['secret'] = $_POST['secret'];

		if($_POST['wins'])
			$l2tpcfg['wins'] = $_POST['wins'];
		else
			unset($l2tpcfg['wins']);

		$l2tpcfg['paporchap'] = $_POST['paporchap'];


		if ($_POST['l2tp_dns1'] == "") {
			if (isset($l2tpcfg['dns1']))
				unset($l2tpcfg['dns1']);
			} else
				$l2tpcfg['dns1'] = $_POST['l2tp_dns1'];

			if ($_POST['l2tp_dns2'] == "") {
				if (isset($l2tpcfg['dns2']))
					unset($l2tpcfg['dns2']);
			} else
				$l2tpcfg['dns2'] = $_POST['l2tp_dns2'];

		if($_POST['radiusenable'] == "yes")
			$l2tpcfg['radius']['enable'] = true;
		else
			unset($l2tpcfg['radius']['enable']);

		if($_POST['radacct_enable'] == "yes")
			$l2tpcfg['radius']['accounting'] = true;
		else
			unset($l2tpcfg['radius']['accounting']);

		if($_POST['radiusissueips'] == "yes")
			$l2tpcfg['radius']['radiusissueips'] = true;
		else
			unset($l2tpcfg['radius']['radiusissueips']);

		write_config();

		$retval = 0;
		$retval = vpn_l2tp_configure();
		$savemsg = get_std_save_message($retval);

		/* if ajax is calling, give them an update message */
		if(isAjax())
			print_info_box_np($savemsg);
	}
}

include("head.inc");
?>

<body link="#0000CC" vlink="#0000CC" alink="#0000CC" onload="<?= $jsevents["body"]["onload"] ?>">
<?php include("fbegin.inc"); ?>

<script type="text/javascript">
//<![CDATA[
function get_radio_value(obj)
{
	for (i = 0; i < obj.length; i++) {
		if (obj[i].checked)
			return obj[i].value;
	}
	return null;
}

function enable_change(enable_over) {
	if ((get_radio_value(document.iform.mode) == "server") || enable_over) {
		document.iform.remoteip.disabled = 0;
		document.iform.localip.disabled = 0;
		document.iform.l2tp_subnet.disabled = 0;
		document.iform.radiusenable.disabled = 0;
		document.iform.radiusissueips.disabled = 0;
		document.iform.paporchap.disabled = 0;
		document.iform.interface.disabled = 0;
		document.iform.n_l2tp_units.disabled = 0;
		document.iform.secret.disabled = 0;
		document.iform.l2tp_dns1.disabled = 0;
		document.iform.l2tp_dns2.disabled = 0;
    /* fix colors */
		document.iform.remoteip.style.backgroundColor = '#FFFFFF';
		document.iform.localip.style.backgroundColor = '#FFFFFF';
		document.iform.l2tp_subnet.style.backgroundColor = '#FFFFFF';
		document.iform.radiusenable.style.backgroundColor = '#FFFFFF';
		document.iform.radiusissueips.style.backgroundColor = '#FFFFFF';
		document.iform.paporchap.style.backgroundColor = '#FFFFFF';
		document.iform.interface.style.backgroundColor = '#FFFFFF';
		document.iform.n_l2tp_units.style.backgroundColor = '#FFFFFF';
		document.iform.secret.style.backgroundColor = '#FFFFFF';
		if (document.iform.radiusenable.checked || enable_over) {
			document.iform.radacct_enable.disabled = 0;
			document.iform.radiusserver.disabled = 0;
			document.iform.radiussecret.disabled = 0;
			document.iform.radiusissueips.disabled = 0;
      /* fix colors */
			document.iform.radacct_enable.style.backgroundColor = '#FFFFFF';
			document.iform.radiusserver.style.backgroundColor = '#FFFFFF';
			document.iform.radiussecret.style.backgroundColor = '#FFFFFF';
			document.iform.radiusissueips.style.backgroundColor = '#FFFFFF';
		} else {
			document.iform.radacct_enable.disabled = 1;
			document.iform.radiusserver.disabled = 1;
			document.iform.radiussecret.disabled = 1;
			document.iform.radiusissueips.disabled = 1;
      /* fix colors */
			document.iform.radacct_enable.style.backgroundColor = '#D4D0C8';
			document.iform.radiusserver.style.backgroundColor = '#D4D0C8';
			document.iform.radiussecret.style.backgroundColor = '#D4D0C8';
			document.iform.radiusissueips.style.backgroundColor = '#D4D0C8';
		}
	} else {
		document.iform.interface.disabled = 1;
		document.iform.n_l2tp_units.disabled = 1;
		document.iform.l2tp_subnet.disabled = 1;
		document.iform.l2tp_dns1.disabled = 1;
		document.iform.l2tp_dns2.disabled = 1;
		document.iform.paporchap.disabled = 1;
		document.iform.remoteip.disabled = 1;
		document.iform.localip.disabled = 1;
		document.iform.radiusenable.disabled = 1;
		document.iform.radacct_enable.disabled = 1;
		document.iform.radiusserver.disabled = 1;
		document.iform.radiussecret.disabled = 1;
		document.iform.radiusissueips.disabled = 1;
		document.iform.secret.disabled = 1;
    /* fix colors */
		document.iform.interface.style.backgroundColor = '#D4D0C8';
		document.iform.n_l2tp_units.style.backgroundColor = '#D4D0C8';
		document.iform.l2tp_subnet.style.backgroundColor = '#D4D0C8';
		document.iform.paporchap.style.backgroundColor = '#D4D0C8';
		document.iform.remoteip.style.backgroundColor = '#D4D0C8';
		document.iform.localip.style.backgroundColor = '#D4D0C8';
		document.iform.radiusenable.style.backgroundColor = '#D4D0C8';
		document.iform.radacct_enable.style.backgroundColor = '#D4D0C8';
		document.iform.radiusserver.style.backgroundColor = '#D4D0C8';
		document.iform.radiussecret.style.backgroundColor = '#D4D0C8';
		document.iform.radiusissueips.style.backgroundColor = '#D4D0C8';
		document.iform.secret.style.backgroundColor = '#D4D0C8';
	}
}
//]]>
</script>
<form action="vpn_l2tp.php" method="post" name="iform" id="iform">
<?php if ($input_errors) print_input_errors($input_errors); ?>
<?php if ($savemsg) print_info_box($savemsg); ?>
<div id="inputerrors"></div>
<table width="100%" border="0" cellpadding="0" cellspacing="0" summary="vpn l2tp">
  <tr><td class="tabnavtbl">
<?php
	$tab_array = array();
	$tab_array[0] = array(gettext("Configuration"), true, "vpn_l2tp.php");
	$tab_array[1] = array(gettext("Users"), false, "vpn_l2tp_users.php");
	display_top_tabs($tab_array);
?>
  </td></tr>
  <tr>
    <td>
	<div id="mainarea">
              <table class="tabcont" width="100%" border="0" cellpadding="6" cellspacing="0" summary="main area">
                <tr>
                  <td width="22%" valign="top" class="vtable">&nbsp;</td>
                  <td width="78%" class="vtable">
                    <input name="mode" type="radio" onclick="enable_change(false)" value="off"
			<?php if (($pconfig['mode'] != "server") && ($pconfig['mode'] != "redir")) echo "checked=\"checked\"";?> />
                    <?=gettext("Off"); ?></td>
		</tr>
                <tr>
                  <td width="22%" valign="top" class="vtable">&nbsp;</td>
                  <td width="78%" class="vtable">
		    <input type="radio" name="mode" value="server" onclick="enable_change(false)" <?php if ($pconfig['mode'] == "server") echo "checked=\"checked\""; ?> />
                    <?=gettext("Enable L2TP server"); ?></td>
		</tr>

                <tr>
                  <td width="22%" valign="top" class="vncell"><b><?=gettext("Interface");?></b></td>
                  <td width="78%" valign="top" class="vtable">

			<select name="interface" class="formselect" id="interface">
			  <?php
				$interfaces = get_configured_interface_with_descr();
				foreach ($interfaces as $iface => $ifacename):
			  ?>
			  <option value="<?=$iface;?>" <?php if ($iface == $pconfig['interface']) echo "selected=\"selected\""; ?>>
			  <?=htmlspecialchars($ifacename);?>
			  </option>
			  <?php endforeach; ?>
			</select> <br />

		  </td>
                </tr>
                <tr>
                  <td width="22%" valign="top" class="vncellreq"><?=gettext("Server Address");?></td>
                  <td width="78%" class="vtable">
                    <?=$mandfldhtml;?><input name="localip" type="text" class="formfld unknown" id="localip" size="20" value="<?=htmlspecialchars($pconfig['localip']);?>" />
			<br />
			<?=gettext("Enter the IP address the L2TP server should give to clients for use as their \"gateway\""); ?>.
			<br />
			<?=gettext("Typically this is set to an unused IP just outside of the client range"); ?>.
			<br />
			<br />
			<?=gettext("NOTE: This should NOT be set to any IP address currently in use on this firewall"); ?>.</td>
                </tr>
                <tr>
                  <td width="22%" valign="top" class="vncellreq"><?=gettext("Remote Address Range");?></td>
                  <td width="78%" class="vtable">
                    <?=$mandfldhtml;?><input name="remoteip" type="text" class="formfld unknown" id="remoteip" size="20" value="<?=htmlspecialchars($pconfig['remoteip']);?>" />
                    <br />
                    <?=gettext("Specify the starting address for the client IP address subnet.");?><br />
                    </td>
                </tr>
                <tr>
                  <td width="22%" valign="top" class="vncellreq"><?=gettext("Subnet Mask"); ?></td>
                  <td width="78%" class="vtable">
                    <select id="l2tp_subnet" name="l2tp_subnet">
                    <?php
                     for($x=0; $x<33; $x++) {
                        if($x == $pconfig['l2tp_subnet'])
                                $SELECTED = " selected=\"selected\"";
                        else
                                $SELECTED = "";
                        echo "<option value=\"{$x}\"{$SELECTED}>{$x}</option>\n";
                     }
                    ?>
                    </select>
                    <br /><?=gettext("Hint:"); ?> 24 <?=gettext("is"); ?> 255.255.255.0
                  </td>
                </tr>
                <tr>
                  <td width="22%" valign="top" class="vncellreq"><?=gettext("Number of L2TP users"); ?></td>
                  <td width="78%" class="vtable">
                    <select id="n_l2tp_units" name="n_l2tp_units">
                    <?php
                     for($x=0; $x<255; $x++) {
                        if($x == $pconfig['n_l2tp_units'])
                                $SELECTED = " selected=\"selected\"";
                        else
                                $SELECTED = "";
                        echo "<option value=\"{$x}\"{$SELECTED}>{$x}</option>\n";
                     }
                    ?>
                    </select>
                    <br /><?=gettext("Hint:"); ?> 10 <?=gettext("is ten L2TP clients"); ?>
                  </td>
                </tr>
		<tr>
                  <td width="22%" valign="top" class="vncell"><?=gettext("Secret");?></td>
                  <td width="78%" class="vtable">
			<input type="password" name="secret" id="secret" class="formfld pwd" value="<?php echo htmlspecialchars($pconfig['secret']); ?>" />
                    <br />
                    <?=gettext("Specify optional secret shared between peers. Required on some devices/setups.");?><br />
                    </td>
                </tr>
                <tr>
                  <td width="22%" valign="top" class="vncellreq"><?=gettext("Authentication Type");?></td>
                  <td width="78%" class="vtable">
                    <?=$mandfldhtml;?><select name="paporchap" id="paporchap">
			<option value='chap'<?php if($pconfig['paporchap'] == "chap") echo " selected=\"selected\""; ?>><?=gettext("CHAP"); ?></option>
			<option value='pap'<?php if($pconfig['paporchap'] == "pap") echo " selected=\"selected\""; ?>><?=gettext("PAP"); ?></option>
		    </select>
                    <br />
                    <?=gettext("Specifies which protocol to use for authentication.");?><br />
                    </td>
                </tr>
		<tr>
		  <td width="22%" valign="top" class="vncell"><?=gettext("L2TP DNS Servers"); ?></td>
		  <td width="78%" class="vtable">
		    <?=$mandfldhtml;?><input name="l2tp_dns1" type="text" class="formfld unknown" id="l2tp_dns1" size="20" value="<?=htmlspecialchars($pconfig['l2tp_dns1']);?>" />
		   	<br />
				<input name="l2tp_dns2" type="text" class="formfld unknown" id="l2tp_dns2" size="20" value="<?=htmlspecialchars($pconfig['l2tp_dns2']);?>" />
			<br />
		   <?=gettext("primary and secondary DNS servers assigned to L2TP clients"); ?><br />
		  </td>
		</tr>
		<tr>
		  <td width="22%" valign="top" class="vncell"><?=gettext("WINS Server"); ?></td>
		  <td width="78%" valign="top" class="vtable">
		      <input name="wins" class="formfld unknown" id="wins" size="20" value="<?=htmlspecialchars($pconfig['wins']);?>" />
		  </td>
		</tr>
                <tr>
                  <td width="22%" valign="top" class="vncell"><?=gettext("RADIUS"); ?></td>
                  <td width="78%" class="vtable">
                      <input name="radiusenable" type="checkbox" id="radiusenable" onclick="enable_change(false)" value="yes" <?php if ($pconfig['radiusenable']) echo "checked=\"checked\""; ?> />
                      <strong> <?=gettext("Use a RADIUS server for authentication");?><br /></strong>
                      <?=gettext("When set, all users will be authenticated using the RADIUS server specified below. The local user database will not be used.");?><br />
                      <br />
                      <input name="radacct_enable" type="checkbox" id="radacct_enable" onclick="enable_change(false)" value="yes" <?php if ($pconfig['radacct_enable']) echo "checked=\"checked\""; ?> />
                      <strong><?=gettext("Enable RADIUS accounting");?></strong><br />
                      <?=gettext("Sends accounting packets to the RADIUS server.");?></td>
                </tr>
                <tr>
                  <td width="22%" valign="top" class="vncell"><?=gettext("RADIUS Server");?></td>
                  <td width="78%" class="vtable">
                      <input name="radiusserver" type="text" class="formfld unknown" id="radiusserver" size="20" value="<?=htmlspecialchars($pconfig['radiusserver']);?>" />
                      <br />
                      <?=gettext("Enter the IP address of the RADIUS server.");?></td>
                </tr>
                <tr>
                  <td width="22%" valign="top" class="vncell"><?=gettext("RADIUS Shared Secret");?></td>
                  <td width="78%" valign="top" class="vtable">
                      <input name="radiussecret" type="password" class="formfld pwd" id="radiussecret" size="20" value="<?=htmlspecialchars($pconfig['radiussecret']);?>" />
                      <br />
                      <?=gettext("Enter the shared secret that will be used to authenticate to the RADIUS server.");?></td>
                </tr>
                <tr>
                  <td width="22%" valign="top" class="vncell"><?=gettext("RADIUS Issued IP's");?></td>
                  <td width="78%" valign="top" class="vtable">
                      <input name="radiusissueips" value="yes" type="checkbox" class="formfld" id="radiusissueips"<?php if(isset($pconfig['radiusissueips'])) echo " checked=\"checked\""; ?> />
                      <br />
                      <?=gettext("Issue IP Addresses via RADIUS server.");?>
                  </td>
                </tr>
                <tr>
                  <td width="22%" valign="top">&nbsp;</td>
                  <td width="78%">
                    <input id="submit" name="Submit" type="submit" class="formbtn" value="<?=gettext("Save"); ?>" onclick="enable_change(true)" />
                  </td>
                </tr>
                <tr>
                  <td colspan="2">
			<span class="vexpl">
				<strong class="red"><?=gettext("Note:");?></strong><br />
				<?=gettext("Don't forget to add a firewall rule to permit traffic from L2TP clients!");?>
			</span>
                  </td>
                </tr>
              </table>
	   </div>
	 </td>
	</tr>
</table>
</form>

<script type="text/javascript">
//<![CDATA[
	enable_change(false);
//]]>
</script>

<?php include("fend.inc"); ?>
</body>
</html>
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