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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
/**
* DNS Library for handling lookups and updates.
*
* PHP Version 5
*
* Copyright (c) 2010, Mike Pultz <mike@mikepultz.com>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * 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.
*
* * Neither the name of Mike Pultz nor the names of his contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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
* COPYRIGHT OWNER OR CONTRIBUTORS 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, STRIC
* 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.
*
* @category Networking
* @package Net_DNS2
* @author Mike Pultz <mike@mikepultz.com>
* @copyright 2010 Mike Pultz <mike@mikepultz.com>
* @license http://www.opensource.org/licenses/bsd-license.php BSD License
* @version SVN: $Id$
* @link http://pear.php.net/package/Net_DNS2
* @since File available since Release 0.6.0
*
* This file contains code based off the Net::DNS::SEC Perl module by
* Olaf M. Kolkman
*
* This is the copyright notice from the PERL Net::DNS::SEC module:
*
* Copyright (c) 2001 - 2005 RIPE NCC. Author Olaf M. Kolkman
* Copyright (c) 2007 - 2008 NLnet Labs. Author Olaf M. Kolkman
* <olaf@net-dns.org>
*
* All Rights Reserved
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appear in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation, and that the name of the author not be
* used in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission.
*
* THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
* ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS; IN NO EVENT SHALL
* AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
* DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
/**
* SIG Resource Record - RFC2535 section 4.1
*
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Type Covered | Algorithm | Labels |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Original TTL |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Signature Expiration |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Signature Inception |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Key Tag | /
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Signer's Name /
* / /
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* / /
* / Signature /
* / /
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* @category Networking
* @package Net_DNS2
* @author Mike Pultz <mike@mikepultz.com>
* @license http://www.opensource.org/licenses/bsd-license.php BSD License
* @link http://pear.php.net/package/Net_DNS2
* @see Net_DNS2_RR
*
*/
class Net_DNS2_RR_SIG extends Net_DNS2_RR
{
/*
* and instance of a Net_DNS2_PrivateKey object
*/
public $private_key = null;
/*
* the RR type covered by this signature
*/
public $typecovered;
/*
* the algorithm used for the signature
*/
public $algorithm;
/*
* the number of labels in the name
*/
public $labels;
/*
* the original TTL
*/
public $origttl;
/*
* the signature expiration
*/
public $sigexp;
/*
* the inception of the signature
*/
public $sigincep;
/*
* the keytag used
*/
public $keytag;
/*
* the signer's name
*/
public $signname;
/*
* the signature
*/
public $signature;
/**
* method to return the rdata portion of the packet as a string
*
* @return string
* @access protected
*
*/
protected function rrToString()
{
return $this->typecovered . ' ' . $this->algorithm . ' ' .
$this->labels . ' ' . $this->origttl . ' ' .
$this->sigexp . ' ' . $this->sigincep . ' ' .
$this->keytag . ' ' . $this->cleanString($this->signname) . '. ' .
$this->signature;
}
/**
* parses the rdata portion from a standard DNS config line
*
* @param array $rdata a string split line of values for the rdata
*
* @return boolean
* @access protected
*
*/
protected function rrFromString(array $rdata)
{
$this->typecovered = strtoupper(array_shift($rdata));
$this->algorithm = array_shift($rdata);
$this->labels = array_shift($rdata);
$this->origttl = array_shift($rdata);
$this->sigexp = array_shift($rdata);
$this->sigincep = array_shift($rdata);
$this->keytag = array_shift($rdata);
$this->signname = $this->cleanString(array_shift($rdata));
foreach ($rdata as $line) {
$this->signature .= $line;
}
$this->signature = trim($this->signature);
return true;
}
/**
* parses the rdata of the Net_DNS2_Packet object
*
* @param Net_DNS2_Packet &$packet a Net_DNS2_Packet packet to parse the RR from
*
* @return boolean
* @access protected
*
*/
protected function rrSet(Net_DNS2_Packet &$packet)
{
if ($this->rdlength > 0) {
//
// unpack
//
$x = unpack(
'ntc/Calgorithm/Clabels/Norigttl/Nsigexp/Nsigincep/nkeytag',
$this->rdata
);
$this->typecovered = Net_DNS2_Lookups::$rr_types_by_id[$x['tc']];
$this->algorithm = $x['algorithm'];
$this->labels = $x['labels'];
$this->origttl = Net_DNS2::expandUint32($x['origttl']);
//
// the dates are in GM time
//
$this->sigexp = gmdate('YmdHis', $x['sigexp']);
$this->sigincep = gmdate('YmdHis', $x['sigincep']);
//
// get the keytag
//
$this->keytag = $x['keytag'];
//
// get teh signers name and signature
//
$offset = $packet->offset + 18;
$sigoffset = $offset;
$this->signname = strtolower(
Net_DNS2_Packet::expand($packet, $sigoffset)
);
$this->signature = base64_encode(
substr($this->rdata, 18 + ($sigoffset - $offset))
);
return true;
}
return false;
}
/**
* returns the rdata portion of the DNS packet
*
* @param Net_DNS2_Packet &$packet a Net_DNS2_Packet packet use for
* compressed names
*
* @return mixed either returns a binary packed
* string or null on failure
* @access protected
*
*/
protected function rrGet(Net_DNS2_Packet &$packet)
{
//
// parse the values out of the dates
//
preg_match(
'/(\d{4})(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})/', $this->sigexp, $e
);
preg_match(
'/(\d{4})(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})/', $this->sigincep, $i
);
//
// pack the value
//
$data = pack(
'nCCNNNn',
Net_DNS2_Lookups::$rr_types_by_name[$this->typecovered],
$this->algorithm,
$this->labels,
$this->origttl,
gmmktime($e[4], $e[5], $e[6], $e[2], $e[3], $e[1]),
gmmktime($i[4], $i[5], $i[6], $i[2], $i[3], $i[1]),
$this->keytag
);
//
// the signer name is special; it's not allowed to be compressed
// (see section 3.1.7)
//
$names = explode('.', strtolower($this->signname));
foreach ($names as $name) {
$data .= chr(strlen($name));
$data .= $name;
}
$data .= chr('0');
//
// if the signature is empty, and $this->private_key is an instance of a
// private key object, and we have access to openssl, then assume this
// is a SIG(0), and generate a new signature
//
if ( (strlen($this->signature) == 0)
&& ($this->private_key instanceof Net_DNS2_PrivateKey)
&& (extension_loaded('openssl') === true)
) {
//
// create a new packet for the signature-
//
$new_packet = new Net_DNS2_Packet_Request('example.com', 'SOA', 'IN');
//
// copy the packet data over
//
$new_packet->copy($packet);
//
// remove the SIG object from the additional list
//
array_pop($new_packet->additional);
$new_packet->header->arcount = count($new_packet->additional);
//
// copy out the data
//
$sigdata = $data . $new_packet->get();
//
// based on the algorithm
//
$algorithm = 0;
switch($this->algorithm) {
//
// MD5
//
case Net_DNS2_Lookups::DNSSEC_ALGORITHM_RSAMD5:
$algorithm = OPENSSL_ALGO_MD5;
break;
//
// SHA1
//
case Net_DNS2_Lookups::DNSSEC_ALGORITHM_RSASHA1:
$algorithm = OPENSSL_ALGO_SHA1;
break;
//
// SHA256 (PHP 5.4.8 or higher)
//
case Net_DNS2_Lookups::DNSSEC_ALGORITHM_RSASHA256:
if (version_compare(PHP_VERSION, '5.4.8', '<') == true) {
throw new Net_DNS2_Exception(
'SHA256 support is only available in PHP >= 5.4.8',
Net_DNS2_Lookups::E_OPENSSL_INV_ALGO
);
}
$algorithm = OPENSSL_ALGO_SHA256;
break;
//
// SHA512 (PHP 5.4.8 or higher)
//
case Net_DNS2_Lookups::DNSSEC_ALGORITHM_RSASHA512:
if (version_compare(PHP_VERSION, '5.4.8', '<') == true) {
throw new Net_DNS2_Exception(
'SHA512 support is only available in PHP >= 5.4.8',
Net_DNS2_Lookups::E_OPENSSL_INV_ALGO
);
}
$algorithm = OPENSSL_ALGO_SHA512;
break;
//
// unsupported at the moment
//
case Net_DNS2_Lookups::DNSSEC_ALGORITHM_DSA:
case Net_DNS2_Lookups::DSNSEC_ALGORITHM_RSASHA1NSEC3SHA1:
case Net_DNS2_Lookups::DNSSEC_ALGORITHM_DSANSEC3SHA1:
default:
throw new Net_DNS2_Exception(
'invalid or unsupported algorithm',
Net_DNS2_Lookups::E_OPENSSL_INV_ALGO
);
break;
}
//
// sign the data
//
if (openssl_sign($sigdata, $this->signature, $this->private_key->instance, $algorithm) == false) {
throw new Net_DNS2_Exception(
openssl_error_string(),
Net_DNS2_Lookups::E_OPENSSL_ERROR
);
}
//
// build the signature value based
//
switch($this->algorithm) {
//
// RSA- add it directly
//
case Net_DNS2_Lookups::DNSSEC_ALGORITHM_RSAMD5:
case Net_DNS2_Lookups::DNSSEC_ALGORITHM_RSASHA1:
case Net_DNS2_Lookups::DNSSEC_ALGORITHM_RSASHA256:
case Net_DNS2_Lookups::DNSSEC_ALGORITHM_RSASHA512:
$this->signature = base64_encode($this->signature);
break;
}
}
//
// add the signature
//
$data .= base64_decode($this->signature);
$packet->offset += strlen($data);
return $data;
}
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* c-hanging-comment-ender-p: nil
* End:
*/
?>
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