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<?php
/**
* r53.class for managing Amazon AWS Route53 Resources
*
* This is a simplified version of r53.class for trivial "dynDNS" operations
* that integrates well with pfSense. Based on the original r53.class by
* Dan Myers at http://sourceforge.net/projects/php-r53/ .
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* Copyright (c) 2011, Dan Myers.
* Parts copyright (c) 2008, Donovan Schonknecht.
* 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.
*
* 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, 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.
*
* This is a modified BSD license (the third clause has been removed).
* The BSD license may be found here:
* http://www.opensource.org/licenses/bsd-license.php
*
* Amazon Route 53 is a trademark of Amazon.com, Inc. or its affiliates.
*
* Route53 is based on Donovan Schonknecht's Amazon S3 PHP class, found here:
* http://undesigned.org.za/2007/10/22/amazon-s3-php-class
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
*/
class Route53
{
protected $__accessKey; // AWS Access key
protected $__secretKey; // AWS Secret key
/**
* Constructor
*
* @param string $accessKey Access key
* @param string $secretKey Secret key
* @return void
*/
public function __construct($accessKey = null, $secretKey = null) {
if ($accessKey !== null && $secretKey !== null) {
$this->setAuth($accessKey, $secretKey);
}
}
/**
* Set AWS access key and secret key
*
* @param string $accessKey Access key
* @param string $secretKey Secret key
* @return void
*/
public function setAuth($accessKey, $secretKey) {
$this->__accessKey = $accessKey;
$this->__secretKey = $secretKey;
}
/**
* Return XML document for POST
*
* @param string $fqdn FQDN to set/update
* @param string $ip IP to set for the FQDN
* @param string $ttl TTL for the record
* @return string XML document
*/
public function getRequestBody($fqdn, $ip, $ttl){
$xmlreq .= "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
$xmlreq .= "<ChangeResourceRecordSetsRequest xmlns=\"https://route53.amazonaws.com/doc/2013-04-01/\">";
$xmlreq .= "<ChangeBatch><Changes><Change>";
$xmlreq .= "<Action>UPSERT</Action>";
$xmlreq .= "<ResourceRecordSet>";
$xmlreq .= sprintf("<Name>%s</Name>", $fqdn);
$xmlreq .= "<Type>A</Type>";
$xmlreq .= sprintf("<TTL>%d</TTL>", $ttl);
$xmlreq .= sprintf("<ResourceRecords><ResourceRecord><Value>%s</Value></ResourceRecord></ResourceRecords>", $ip);
$xmlreq .= "</ResourceRecordSet>";
$xmlreq .= "</Change></Changes></ChangeBatch>";
$xmlreq .= "</ChangeResourceRecordSetsRequest>";
return $xmlreq;
}
/**
* Return API URL
*
* @param string $zoneid Amazon Zone ID
* @return string URL
*/
public function getApiUrl($zoneid){
return sprintf("https://route53.amazonaws.com/2013-04-01/hostedzone/%s/rrset", $zoneid);
}
/**
* Return HTTP post headers
*
* @param string zoneId Amazon Zone
* @param string regionId Amazon Region Code (e.g. us-east-1)
* @param string requestBodySHA256 SHA256 hash of the request body
* @return Array headers
*/
public function getHttpPostHeaders($zoneId, $regionId, $requestBodySHA256){
$canonical_uri = sprintf("/2013-04-01/hostedzone/%s/rrset", $zoneId);
$amz_date = sprintf("%sT%sZ", gmdate('Ymd'), gmdate('His'));
$date_stamp = gmdate('Ymd');
$canonical_headers = sprintf("content-type:%s\nhost:%s\n:x-amx-date:%s\n",
"text/xml", "route53.amazonaws.com", $amz_date);
$signed_headers = "content-type;host;x-amz-date";
$canonical_request = sprintf("%s\n%s\n/\n/%s\n%s\n%s\n ",
"POST", $canonical_uri, $canonical_headers, $signed_headers, $requestBodySHA256);
$algorithm = "AWS4-HMAC-SHA256";
$credential_scope = sprintf("%s/%s/%s/%s", $date_stamp, $regionId, "route53domains", "aws4_request");
$string_to_sign = sprintf("%s\n%s\n%s\n%s ",
$algorithm, $amz_date, $credential_scope, hash("sha256", $canonical_request));
$signing_key = getAWS4SigningKey($this->__secretKey, $date_stamp, $regionId);
$signature = hash_hmac("sha256", $string_to_sign, $signing_key);
$authorization_header = sprintf("%s Credential=%s/%s, SignedHeader=%s Signature=%s",
$algorithm, $this->__accessKey, $credential_scope, $signed_headers, $signature);
$httphead[] = array();
$httphead[] = "Content-Type: text/xml";
$httphead[] = sprintf("X-Amz-Date: %s", $amz_date);
$httphead[] = sprintf("Authorization: %s", $authorization_header);
return $httphead;
}
/**
* Return Signing key
*
* @param string secretKey The AWS key
* @param string dateStamp The AWS signing date in the form YYYYMMDD
* @param string regionName The AWS region name - e.g. us-east-1
*/
public function getAWS4SigningKey($secretKey, $dateStamp, $regionName){
$kSecret = sprintf("AWS4%s", $secretKey);
$kDate = hash_hmac("sha256", $dateStamp, $kSecret);
$kRegion = hash_hmac("sha256", $regionName, $kDate);
$kService = hash_hmac("sha256", "route53domains", $kRegion);
return hash_hmac("sha256", "aws4_request", $kService);
}
}
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