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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
*
*/
/**
* SSHFP Resource Record - RFC4255 section 3.1
*
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | algorithm | fp type | /
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ /
* / /
* / fingerprint /
* / /
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* @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_SSHFP extends Net_DNS2_RR
{
/*
* the algorithm used
*/
public $algorithm;
/*
* The finger print type
*/
public $fp_type;
/*
* the finger print data
*/
public $fingerprint;
/*
* Algorithms
*/
const SSHFP_ALGORITHM_RES = 0;
const SSHFP_ALGORITHM_RSA = 1;
const SSHFP_ALGORITHM_DSS = 2;
const SSHFP_ALGORITHM_ECDSA = 3;
const SSHFP_ALGORITHM_ED25519 = 4;
/*
* Fingerprint Types
*/
const SSHFP_FPTYPE_RES = 0;
const SSHFP_FPTYPE_SHA1 = 1;
const SSHFP_FPTYPE_SHA256 = 2;
/**
* method to return the rdata portion of the packet as a string
*
* @return string
* @access protected
*
*/
protected function rrToString()
{
return $this->algorithm . ' ' . $this->fp_type . ' ' . $this->fingerprint;
}
/**
* 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 use of mnemonics instead of numbers is not allowed."
//
// RFC4255 section 3.2
//
$algorithm = array_shift($rdata);
$fp_type = array_shift($rdata);
$fingerprint = strtolower(implode('', $rdata));
//
// There are only two algorithm's defined
//
if ( ($algorithm != self::SSHFP_ALGORITHM_RSA)
&& ($algorithm != self::SSHFP_ALGORITHM_DSS)
&& ($algorithm != self::SSHFP_ALGORITHM_ECDSA)
&& ($algorithm != self::SSHFP_ALGORITHM_ED25519)
) {
return false;
}
//
// there are only two fingerprints defined
//
if ( ($fp_type != self::SSHFP_FPTYPE_SHA1)
&& ($fp_type != self::SSHFP_FPTYPE_SHA256)
) {
return false;
}
$this->algorithm = $algorithm;
$this->fp_type = $fp_type;
$this->fingerprint = $fingerprint;
return true;
}
/**
* parses the rdata of the Net_DNS2_Packet object
*
* @param Net_DNS2_Packet &$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 the algorithm and finger print type
//
$x = unpack('Calgorithm/Cfp_type', $this->rdata);
$this->algorithm = $x['algorithm'];
$this->fp_type = $x['fp_type'];
//
// There are only three algorithm's defined
//
if ( ($this->algorithm != self::SSHFP_ALGORITHM_RSA)
&& ($this->algorithm != self::SSHFP_ALGORITHM_DSS)
&& ($this->algorithm != self::SSHFP_ALGORITHM_ECDSA)
&& ($this->algorithm != self::SSHFP_ALGORITHM_ED25519)
) {
return false;
}
//
// there are only two fingerprints defined
//
if ( ($this->fp_type != self::SSHFP_FPTYPE_SHA1)
&& ($this->fp_type != self::SSHFP_FPTYPE_SHA256)
) {
return false;
}
//
// parse the finger print; this assumes SHA-1
//
$fp = unpack('H*a', substr($this->rdata, 2));
$this->fingerprint = strtolower($fp['a']);
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->fingerprint) > 0) {
$data = pack(
'CCH*', $this->algorithm, $this->fp_type, $this->fingerprint
);
$packet->offset += strlen($data);
return $data;
}
return null;
}
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* c-hanging-comment-ender-p: nil
* End:
*/
?>
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