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<?php
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/*
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ipsec.inc
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Copyright (C) 2007 Scott Ullrich
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Copyright (C) 2008 Shrew Soft Inc
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All rights reserved.
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Parts of this code was originally based on vpn_ipsec_sad.php
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Copyright (C) 2003-2004 Manuel Kasper
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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/* IPsec defines */
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$my_identifier_list = array(
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'myaddress' => array( 'desc' => 'My IP address', 'mobile' => true ),
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'address' => array( 'desc' => 'IP address', 'mobile' => true ),
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'fqdn' => array( 'desc' => 'Distinguished name', 'mobile' => true ),
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'user_fqdn' => array( 'desc' => 'User distinguished name', 'mobile' => true ),
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'asn1dn' => array( 'desc' => 'ASN.1 distinguished Name', 'mobile' => true ),
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'keyid tag' => array( 'desc' => 'KeyID tag', 'mobile' => true ),
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'dyn_dns' => array( 'desc' => 'Dynamic DNS', 'mobile' => true ));
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$peer_identifier_list = array(
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'peeraddress' => array( 'desc' => 'Peer IP address', 'mobile' => false ),
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'address' => array( 'desc' => 'IP address', 'mobile' => false ),
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'fqdn' => array( 'desc' => 'Distinguished name', 'mobile' => true ),
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'user_fqdn' => array( 'desc' => 'User distinguished name', 'mobile' => true ),
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'asn1dn' => array( 'desc' => 'ASN.1 distinguished Name', 'mobile' => true ),
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'keyid tag' => array( 'desc' =>'KeyID tag', 'mobile' => true ));
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$p1_ealgos = array(
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'aes' => array( 'name' => 'AES', 'keysel' => array( 'lo' => 128, 'hi' => 256, 'step' => 64 ) ),
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'blowfish' => array( 'name' => 'Blowfish', 'keysel' => array( 'lo' => 128, 'hi' => 256, 'step' => 8 ) ),
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'3des' => array( 'name' => '3DES' ),
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'cast128' => array( 'name' => 'CAST128' ),
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'des' => array( 'name' => 'DES' ));
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$p2_ealgos = array(
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'aes' => array( 'name' => 'AES', 'keysel' => array( 'lo' => 128, 'hi' => 256, 'step' => 64 ) ),
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'blowfish' => array( 'name' => 'Blowfish', 'keysel' => array( 'lo' => 128, 'hi' => 256, 'step' => 8 ) ),
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'3des' => array( 'name' => '3DES' ),
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'cast128' => array( 'name' => 'CAST128' ),
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'des' => array( 'name' => 'DES' ));
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$p1_halgos = array(
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'sha1' => 'SHA1',
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'md5' => 'MD5');
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$p2_halgos = array(
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'hmac_sha1' => 'SHA1',
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'hmac_md5' => 'MD5');
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$p1_authentication_methods = array(
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'hybrid_rsa_server' => array( 'name' => 'Hybrid RSA + Xauth', 'mobile' => true ),
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'xauth_rsa_server' => array( 'name' => 'Mutual RSA + Xauth', 'mobile' => true ),
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'xauth_psk_server' => array( 'name' => 'Mutual PSK + Xauth', 'mobile' => true ),
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'rsasig' => array( 'name' => 'Mutual RSA', 'mobile' => false ),
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'pre_shared_key' => array( 'name' => 'Mutual PSK', 'mobile' => false ) );
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$p2_modes = array(
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'tunnel' => 'Tunnel',
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'transport' => 'Transport');
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$p2_protos = array(
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'esp' => 'ESP',
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'ah' => 'AH');
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$p2_pfskeygroups = array(
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'0' => 'off',
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'1' => '1',
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'2' => '2',
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'5' => '5');
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/*
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* ikeid management functions
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*/
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function ipsec_ikeid_used($ikeid) {
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global $config;
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foreach ($config['ipsec']['phase1'] as $ph1ent)
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if( $ikeid == $ph1ent['ikeid'] )
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return true;
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return false;
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}
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function ipsec_ikeid_next() {
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$ikeid = 1;
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while(ipsec_ikeid_used($ikeid))
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$ikeid++;
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return $ikeid;
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}
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/*
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* Return phase1 local address
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*/
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function ipsec_get_phase1_src(& $ph1ent) {
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if ($ph1ent['interface'])
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$if = $ph1ent['interface'];
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else
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$if = "WAN";
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$realinterface = convert_friendly_interface_to_real_interface_name($if);
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$interfaceip = find_interface_ip($realinterface);
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return $interfaceip;
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}
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/*
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* Return phase1 local address
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*/
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function ipsec_get_phase1_dst(& $ph1ent) {
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$rg = $ph1ent['remote-gateway'];
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if (!is_ipaddr($rg))
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return resolve_retry($rg);
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if(!is_ipaddr($rg))
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return false;
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return $rg;
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}
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/*
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* Return phase2 idinfo in cidr format
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*/
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function ipsec_idinfo_to_cidr(& $idinfo,$addrbits = false) {
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global $config;
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switch ($idinfo['type'])
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{
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case "address":
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if ($addrbits)
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return $idinfo['address']."/32";
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else
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return $idinfo['address'];
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case "network":
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return $idinfo['address']."/".$idinfo['netbits'];
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case "mobile":
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return "0.0.0.0/0";
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default:
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$address = get_interface_ip($idinfo['type']);
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$netbits = get_interface_subnet($idinfo['type']);
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$address = gen_subnet($address,$netbits);
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return $address."/".$netbits;
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}
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}
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/*
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* Return phase2 idinfo in address/netmask format
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*/
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function ipsec_idinfo_to_subnet(& $idinfo,$addrbits = false) {
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global $config;
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switch ($idinfo['type'])
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{
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case "address":
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if ($addrbits)
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return $idinfo['address']."/255.255.255.255";
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else
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return $idinfo['address'];
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case "network":
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return $idinfo['address']."/".gen_subnet_mask($idinfo['netbits']);
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case "mobile":
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return "0.0.0.0/0";
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default:
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$address = get_interface_ip($idinfo['type']);
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$netbits = get_interface_subnet($idinfo['type']);
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$address = gen_subnet($address,$netbits);
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$netbits = gen_subnet_mask($netbits);
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return $address."/".netbits;
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}
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}
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/*
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* Return phase2 idinfo in text format
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*/
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function ipsec_idinfo_to_text(& $idinfo) {
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switch ($idinfo['type'])
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{
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case "address":
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return $idinfo['address'];
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case "network":
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return $idinfo['address']."/".$idinfo['netbits'];
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case "mobile":
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return "Mobile Client";
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default:
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return strtoupper($idinfo['type']);
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}
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}
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/*
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* Return phase1 association for phase2
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*/
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function ipsec_lookup_phase1(& $ph2ent,& $ph1ent)
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{
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global $config;
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$a_phase1 = $config['ipsec']['phase1'];
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if (is_array($a_phase1) && count($a_phase1)) {
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foreach ($a_phase1 as $ph1tmp) {
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if ($ph1tmp['ikeid'] == $ph2ent['ikeid']) {
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$ph1ent = $ph1tmp;
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return $ph1ent;
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}
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}
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}
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return false;
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}
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/*
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* Check phase1 communications status
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*/
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function ipsec_phase1_status(& $ph1ent) {
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$loc_ip = get_ipsec_tunnel_src($ph1ent);
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$rmt_ip = $ph1ent['remote-gateway'];
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if(ipsec_lookup_ipsakmp_sa($loc_ip,$rmt_ip))
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return true;
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return false;
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}
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/*
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* Check phase2 communications status
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*/
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function ipsec_phase2_status(& $spd,& $sad,& $ph1ent,& $ph2ent) {
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$loc_ip = ipsec_get_phase1_src($ph1ent);
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$rmt_ip = gethostbyname(ipsec_get_phase1_dst($ph1ent));
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$loc_id = ipsec_idinfo_to_cidr($ph2ent['localid'],true);
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$rmt_id = ipsec_idinfo_to_cidr($ph2ent['remoteid'],true);
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/* check for established SA in both directions */
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if( ipsec_lookup_ipsec_sa($spd,$sad,"out",$loc_ip,$rmt_ip,$loc_id,$rmt_id) &&
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ipsec_lookup_ipsec_sa($spd,$sad,"in",$rmt_ip,$loc_ip,$rmt_id,$loc_id))
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return true;
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return false;
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}
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/*
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* Return ISAKMP SA details
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*/
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function ipsec_lookup_isakmp_sa($in_srcip,$in_dstip) {
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/* TODO : use racconctl to lookup iskamp SA */
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return NULL;
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}
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/*
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* Return IPsec SA details
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*/
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function ipsec_lookup_ipsec_sa(& $spd,& $sad,$dir,$in_srcip,$in_dstip,$in_srcid,$in_dstid) {
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/* match the phase1/2 to an SP */
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foreach($spd as $sp) {
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/* match direction */
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if($dir != $sp['dir'])
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continue;
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/* match IPs */
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293
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if($in_srcip != $sp['src'])
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continue;
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if($in_dstip != $sp['dst'])
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continue;
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298
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/* add netbits for address IDs */
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300
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$sp_srcid = $sp['srcid'];
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$sp_dstid = $sp['dstid'];
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if (!strstr($sp_srcid,"/"))
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$sp_srcid .= '/32';
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if (!strstr($sp_dstid,"/"))
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$sp_dstid .= '/32';
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308
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/* match IDs */
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310
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311
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if($in_srcid != $sp_srcid)
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continue;
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313
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if($in_dstid != $sp_dstid)
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314
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continue;
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315
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316
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/* match the SP to a unique SA by reqid */
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317
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318
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foreach($sad as $sa) {
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319
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320
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/* match REQIDs */
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321
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322
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if($sa[reqid] != $sp[reqid])
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continue;
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324
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325
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/* sanitize for NAT-T ports */
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326
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327
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$sa_srcip = $sa['src'];
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328
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$sa_dstip = $sa['dst'];
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329
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330
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if (strstr($sa_srcip,"["))
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$sa_srcip = substr($sa_srcip,0,strcspn($sa_srcip,"["));
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332
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if (strstr($sa_dstip,"["))
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$sa_dstip = substr($sa_dstip,0,strcspn($sa_dstip,"["));
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334
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335
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/* match IPs */
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336
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337
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if($in_srcip != $sa_srcip)
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338
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continue;
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339
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if($in_dstip != $sa_dstip)
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340
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continue;
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341
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342
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return $sa;
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343
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}
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344
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}
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345
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346
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return NULL;
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347
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}
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348
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349
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/*
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350
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* Return dump of SPD table
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351
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*/
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352
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function ipsec_dump_spd()
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353
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{
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354
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$fd = @popen("/usr/local/sbin/setkey -DP", "r");
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355
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$spd = array();
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if ($fd) {
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357
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while (!feof($fd)) {
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358
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$line = chop(fgets($fd));
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359
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if (!$line)
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360
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continue;
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361
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if ($line == "No SPD entries.")
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362
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break;
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363
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if ($line[0] != "\t") {
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364
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if (is_array($cursp))
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365
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$spd[] = $cursp;
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366
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$cursp = array();
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367
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$linea = explode(" ", $line);
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368
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$cursp['srcid'] = substr($linea[0], 0, strpos($linea[0], "["));
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369
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$cursp['dstid'] = substr($linea[1], 0, strpos($linea[1], "["));
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370
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$i = 0;
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371
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} else if (is_array($cursp)) {
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372
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$linea = explode(" ", trim($line));
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373
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switch($i)
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374
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{
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375
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case 1:
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376
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if ($linea[1] == "none") /* don't show default anti-lockout rule */
|
|
377
|
unset($cursp);
|
|
378
|
else
|
|
379
|
$cursp['dir'] = $linea[0];
|
|
380
|
break;
|
|
381
|
case 2:
|
|
382
|
$upperspec = explode("/", $linea[0]);
|
|
383
|
$cursp['proto'] = $upperspec[0];
|
|
384
|
list($cursp['src'], $cursp['dst']) = explode("-", $upperspec[2]);
|
|
385
|
$cursp['reqid'] = substr($upperspec[3], strpos($upperspec[3], "#")+1);
|
|
386
|
break;
|
|
387
|
}
|
|
388
|
}
|
|
389
|
$i++;
|
|
390
|
}
|
|
391
|
if (is_array($cursp) && count($cursp))
|
|
392
|
$spd[] = $cursp;
|
|
393
|
pclose($fd);
|
|
394
|
}
|
|
395
|
|
|
396
|
return $spd;
|
|
397
|
}
|
|
398
|
|
|
399
|
/*
|
|
400
|
* Return dump of SAD table
|
|
401
|
*/
|
|
402
|
function ipsec_dump_sad()
|
|
403
|
{
|
|
404
|
$fd = @popen("/usr/local/sbin/setkey -D", "r");
|
|
405
|
$sad = array();
|
|
406
|
if ($fd) {
|
|
407
|
while (!feof($fd)) {
|
|
408
|
$line = chop(fgets($fd));
|
|
409
|
if (!$line)
|
|
410
|
continue;
|
|
411
|
if ($line == "No SAD entries.")
|
|
412
|
break;
|
|
413
|
if ($line[0] != "\t")
|
|
414
|
{
|
|
415
|
if (is_array($cursa))
|
|
416
|
$sad[] = $cursa;
|
|
417
|
$cursa = array();
|
|
418
|
list($cursa['src'],$cursa['dst']) = explode(" ", $line);
|
|
419
|
$i = 0;
|
|
420
|
}
|
|
421
|
else
|
|
422
|
{
|
|
423
|
$linea = explode(" ", trim($line));
|
|
424
|
switch ($i) {
|
|
425
|
case 1:
|
|
426
|
$cursa['proto'] = $linea[0];
|
|
427
|
$cursa['spi'] = substr($linea[2], strpos($linea[2], "x")+1, -1);
|
|
428
|
$reqid = substr($linea[3], strpos($linea[3], "=")+1);
|
|
429
|
$cursa['reqid'] = substr($reqid, 0, strcspn($reqid,"("));
|
|
430
|
break;
|
|
431
|
case 2:
|
|
432
|
$cursa['ealgo'] = $linea[1];
|
|
433
|
break;
|
|
434
|
case 3:
|
|
435
|
$cursa['aalgo'] = $linea[1];
|
|
436
|
break;
|
|
437
|
}
|
|
438
|
}
|
|
439
|
$i++;
|
|
440
|
}
|
|
441
|
if (is_array($cursa) && count($cursa))
|
|
442
|
$sad[] = $cursa;
|
|
443
|
pclose($fd);
|
|
444
|
}
|
|
445
|
|
|
446
|
return $sad;
|
|
447
|
}
|
|
448
|
|
|
449
|
?>
|