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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
*
*/
/**
* TSIG Resource Record - RFC 2845
*
* 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* / algorithm /
* / /
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | time signed |
* | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | | fudge |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | mac size | /
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ /
* / mac /
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | original id | error |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | other length | /
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ /
* / other data /
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* @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_TSIG extends Net_DNS2_RR
{
/*
* TSIG Algorithm Identifiers
*/
const HMAC_MD5 = 'hmac-md5.sig-alg.reg.int'; // RFC 2845, required
const GSS_TSIG = 'gss-tsig'; // unsupported, optional
const HMAC_SHA1 = 'hmac-sha1'; // RFC 4635, required
const HMAC_SHA224 = 'hmac-sha224'; // RFC 4635, optional
const HMAC_SHA256 = 'hmac-sha256'; // RFC 4635, required
const HMAC_SHA384 = 'hmac-sha384'; // RFC 4635, optional
const HMAC_SHA512 = 'hmac-sha512'; // RFC 4635, optional
/*
* the map of hash values to names
*/
public static $hash_algorithms = array(
self::HMAC_MD5 => 'md5',
self::HMAC_SHA1 => 'sha1',
self::HMAC_SHA224 => 'sha224',
self::HMAC_SHA256 => 'sha256',
self::HMAC_SHA384 => 'sha384',
self::HMAC_SHA512 => 'sha512'
);
/*
* algorithm used; only supports HMAC-MD5
*/
public $algorithm;
/*
* The time it was signed
*/
public $time_signed;
/*
* fudge- allowed offset from the time signed
*/
public $fudge;
/*
* size of the digest
*/
public $mac_size;
/*
* the digest data
*/
public $mac;
/*
* the original id of the request
*/
public $original_id;
/*
* additional error code
*/
public $error;
/*
* length of the "other" data, should only ever be 0 when there is
* no error, or 6 when there is the error RCODE_BADTIME
*/
public $other_length;
/*
* the other data; should only ever be a timestamp when there is the
* error RCODE_BADTIME
*/
public $other_data;
/*
* the key to use for signing - passed in, not included in the rdata
*/
public $key;
/**
* method to return the rdata portion of the packet as a string
*
* @return string
* @access protected
*
*/
protected function rrToString()
{
$out = $this->cleanString($this->algorithm) . '. ' .
$this->time_signed . ' ' .
$this->fudge . ' ' . $this->mac_size . ' ' .
base64_encode($this->mac) . ' ' . $this->original_id . ' ' .
$this->error . ' '. $this->other_length;
if ($this->other_length > 0) {
$out .= ' ' . $this->other_data;
}
return $out;
}
/**
* 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)
{
//
// the only value passed in is the key-
//
// this assumes it's passed in base64 encoded.
//
$this->key = preg_replace('/\s+/', '', array_shift($rdata));
//
// the rest of the data is set to default
//
$this->algorithm = self::HMAC_MD5;
$this->time_signed = time();
$this->fudge = 300;
$this->mac_size = 0;
$this->mac = '';
$this->original_id = 0;
$this->error = 0;
$this->other_length = 0;
$this->other_data = '';
//
// per RFC 2845 section 2.3
//
$this->class = 'ANY';
$this->ttl = 0;
return true;
}
/**
* parses the rdata of the Net_DNS2_Packet object
*
* @param Net_DNS2_Packet &$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) {
//
// expand the algorithm
//
$newoffset = $packet->offset;
$this->algorithm = Net_DNS2_Packet::expand($packet, $newoffset);
$offset = $newoffset - $packet->offset;
//
// unpack time, fudge and mac_size
//
$x = unpack(
'@' . $offset . '/ntime_high/Ntime_low/nfudge/nmac_size',
$this->rdata
);
$this->time_signed = Net_DNS2::expandUint32($x['time_low']);
$this->fudge = $x['fudge'];
$this->mac_size = $x['mac_size'];
$offset += 10;
//
// copy out the mac
//
if ($this->mac_size > 0) {
$this->mac = substr($this->rdata, $offset, $this->mac_size);
$offset += $this->mac_size;
}
//
// unpack the original id, error, and other_length values
//
$x = unpack(
'@' . $offset . '/noriginal_id/nerror/nother_length',
$this->rdata
);
$this->original_id = $x['original_id'];
$this->error = $x['error'];
$this->other_length = $x['other_length'];
//
// the only time there is actually any "other data", is when there's
// a BADTIME error code.
//
// The other length should be 6, and the other data field includes the
// servers current time - per RFC 2845 section 4.5.2
//
if ($this->error == Net_DNS2_Lookups::RCODE_BADTIME) {
if ($this->other_length != 6) {
return false;
}
//
// other data is a 48bit timestamp
//
$x = unpack(
'nhigh/nlow',
substr($this->rdata, $offset + 6, $this->other_length)
);
$this->other_data = $x['low'];
}
return true;
}
return false;
}
/**
* returns the rdata portion of the DNS packet
*
* @param Net_DNS2_Packet &$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 &$packet)
{
if (strlen($this->key) > 0) {
//
// 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 TSIG object from the additional list
//
array_pop($new_packet->additional);
$new_packet->header->arcount = count($new_packet->additional);
//
// copy out the data
//
$sig_data = $new_packet->get();
//
// add the name without compressing
//
$sig_data .= Net_DNS2_Packet::pack($this->name);
//
// add the class and TTL
//
$sig_data .= pack(
'nN', Net_DNS2_Lookups::$classes_by_name[$this->class], $this->ttl
);
//
// add the algorithm name without compression
//
$sig_data .= Net_DNS2_Packet::pack(strtolower($this->algorithm));
//
// add the rest of the values
//
$sig_data .= pack(
'nNnnn', 0, $this->time_signed, $this->fudge,
$this->error, $this->other_length
);
if ($this->other_length > 0) {
$sig_data .= pack('nN', 0, $this->other_data);
}
//
// sign the data
//
$this->mac = $this->_signHMAC(
$sig_data, base64_decode($this->key), $this->algorithm
);
$this->mac_size = strlen($this->mac);
//
// compress the algorithm
//
$data = Net_DNS2_Packet::pack(strtolower($this->algorithm));
//
// pack the time, fudge and mac size
//
$data .= pack(
'nNnn', 0, $this->time_signed, $this->fudge, $this->mac_size
);
$data .= $this->mac;
//
// check the error and other_length
//
if ($this->error == Net_DNS2_Lookups::RCODE_BADTIME) {
$this->other_length = strlen($this->other_data);
if ($this->other_length != 6) {
return null;
}
} else {
$this->other_length = 0;
$this->other_data = '';
}
//
// pack the id, error and other_length
//
$data .= pack(
'nnn', $packet->header->id, $this->error, $this->other_length
);
if ($this->other_length > 0) {
$data .= pack('nN', 0, $this->other_data);
}
$packet->offset += strlen($data);
return $data;
}
return null;
}
/**
* signs the given data with the given key, and returns the result
*
* @param string $data the data to sign
* @param string $key key to use for signing
* @param string $algorithm the algorithm to use; defaults to MD5
*
* @return string the signed digest
* @throws Net_DNS2_Exception
* @access private
*
*/
private function _signHMAC($data, $key = null, $algorithm = self::HMAC_MD5)
{
//
// use the hash extension; this is included by default in >= 5.1.2 which
// is our dependent version anyway- so it's easy to switch to it.
//
if (extension_loaded('hash')) {
if (!isset(self::$hash_algorithms[$algorithm])) {
throw new Net_DNS2_Exception(
'invalid or unsupported algorithm',
Net_DNS2_Lookups::E_PARSE_ERROR
);
}
return hash_hmac(self::$hash_algorithms[$algorithm], $data, $key, true);
}
//
// if the hash extension isn't loaded, and they selected something other
// than MD5, throw an exception
//
if ($algorithm != self::HMAC_MD5) {
throw new Net_DNS2_Exception(
'only HMAC-MD5 supported. please install the php-extension ' .
'"hash" in order to use the sha-family',
Net_DNS2_Lookups::E_PARSE_ERROR
);
}
//
// otherwise, do it ourselves
//
if (is_null($key)) {
return pack('H*', md5($data));
}
$key = str_pad($key, 64, chr(0x00));
if (strlen($key) > 64) {
$key = pack('H*', md5($key));
}
$k_ipad = $key ^ str_repeat(chr(0x36), 64);
$k_opad = $key ^ str_repeat(chr(0x5c), 64);
return $this->_signHMAC(
$k_opad . pack('H*', md5($k_ipad . $data)), null, $algorithm
);
}
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* c-hanging-comment-ender-p: nil
* End:
*/
?>
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