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<?php
/**
** PHP versions 4 and 5
**
** LICENSE: See the COPYING file included in this distribution.
**
** @package OpenID
** @author Santosh Subramanian <subrasan@cs.sunysb.edu>
** @author Shishir Randive <srandive@cs.sunysb.edu>
** Stony Brook University.
** largely derived from
**
* Copyright (C) 2007 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
class SAML{
private $assertionTemplate=null;
/**
* Returns a SAML response with various elements filled in.
* @param string $authenticatedUser The OpenId of the user
* @param string $notBefore The ISO 8601 formatted date before which the
response is invalid
* @param string $notOnOrAfter The ISO 8601 formatted data after which the
response is invalid
* @param string $rsadsa 'rsa' if the response will be signed with RSA keys,
'dsa' for DSA keys
* @param string $requestID The ID of the request we're responding to
* @param string $destination The ACS URL that the response is submitted to
* @return string XML SAML response.
*/
function createSamlAssertion($authenticatedUser, $notBefore, $notOnOrAfter, $rsadsa, $acsURI,$attribute,$value,$assertionTemplate)
{
$samlResponse = $assertionTemplate;
$samlResponse = str_replace('USERNAME_STRING', $authenticatedUser, $samlResponse);
$samlResponse = str_replace('RESPONSE_ID', $this->samlCreateId(), $samlResponse);
$samlResponse = str_replace('ISSUE_INSTANT', $this->samlGetDateTime(time()), $samlResponse);
$samlResponse = str_replace('NOT_BEFORE', $this->samlGetDateTime(strtotime($notBefore)), $samlResponse);
$samlResponse = str_replace('NOT_ON_OR_AFTER', $this->samlGetDateTime(strtotime($notOnOrAfter)),$samlResponse);
$samlResponse = str_replace('ASSERTION_ID',$this->samlCreateId(), $samlResponse);
$samlResponse = str_replace('RSADSA', strtolower($rsadsa), $samlResponse);
$samlResponse = str_replace('ISSUER_DOMAIN', $acsURI, $samlResponse);
$samlResponse = str_replace('ATTRIBUTE_NAME', $attribute, $samlResponse);
$samlResponse = str_replace('ATTRIBUTE_VALUE', $value, $samlResponse);
return $samlResponse;
}
/**
* Signs a SAML response with the given private key, and embeds the public key.
* @param string $responseXmlString The unsigned Assertion which will be signed
* @param string $priKey Private key to sign the certificate
* @param string $cert Public key certificate of signee
* @return string Signed Assertion
*/
function signAssertion($responseXmlString,$privKey,$cert)
{
if (file_exists("/tmp/xml")) {
$tempFileDir="/tmp/xml/";
} else {
mkdir("/tmp/xml",0777);
$tempFileDir="/tmp/xml/";
}
$tempName = 'saml-response-' . $this->samlCreateId() . '.xml';
$tempFileName=$tempFileDir.$tempName;
while (file_exists($tempFileName))
$tempFileName = 'saml-response-' . $this->samlCreateId() . '.xml';
if (!$handle = fopen($tempFileName, 'w')) {
return null;
}
if (fwrite($handle, $responseXmlString) === false) {
return null;
}
fclose($handle);
$cmd = 'xmlsec1 --sign --privkey-pem ' . $privKey .
',' . $cert . ' --output ' . $tempFileName .
'.out ' . $tempFileName;
exec($cmd, $resp);
unlink($tempFileName);
$xmlResult = @file_get_contents($tempFileName . '.out');
if (!$xmlResult) {
return null;
} else {
unlink($tempFileName . '.out');
return $xmlResult;
}
}
/**
* Verify a saml response with the given public key.
* @param string $responseXmlString Response to sign
* @param string $rootcert trusted public key certificate
* @return string Signed SAML response
*/
function verifyAssertion($responseXmlString,$rootcert)
{
date_default_timezone_set("UTC");
if (file_exists("/tmp/xml")) {
$tempFileDir="/tmp/xml/";
} else {
mkdir("/tmp/xml",0777);
$tempFileDir="/tmp/xml/";
}
$tempName = 'saml-response-' . $this->samlCreateId() . '.xml';
$tempFileName=$tempFileDir.$tempName;
while (file_exists($tempFileName))
$tempFileName = 'saml-response-' . $this->samlCreateId() . '.xml';
if (!$handle = fopen($tempFileName, 'w')) {
return false;
}
if (fwrite($handle, $responseXmlString) === false) {
return false;
}
$p=xml_parser_create();
$result=xml_parse_into_struct($p,$responseXmlString,$vals,$index);
xml_parser_free($p);
$cert_info=$index["X509CERTIFICATE"];
$conditions=$index["CONDITIONS"];
foreach($cert_info as $key=>$value){
file_put_contents($tempFileName.'.cert',$vals[$value]['value']);
}
$cert=$tempFileName.'.cert';
$before=0;
$after=0;
foreach($conditions as $key=>$value){
$before=$vals[$value]['attributes']['NOTBEFORE'];
$after=$vals[$value]['attributes']['NOTONORAFTER'];
}
$before=$this->validSamlDateFormat($before);
$after=$this->validSamlDateFormat($after);
if(strtotime("now") < $before || strtotime("now") >= $after){
unlink($tempFileName);
unlink($cert);
return false;
}
fclose($handle);
$cmd = 'xmlsec1 --verify --pubkey-cert ' . $cert .'--trusted '.$rootcert. ' '.$tempFileName.'* 2>&1 1>/dev/null';
exec($cmd,$resp);
if(strcmp($resp[0],"FAIL") == 0){
$value = false;
}elseif(strcmp($resp[0],"ERROR") == 0){
$value = false;
}elseif(strcmp($resp[0],"OK") == 0){
$value = TRUE;
}
unlink($tempFileName);
unlink($cert);
return $value;
}
/**
* Creates a 40-character string containing 160-bits of pseudorandomness.
* @return string Containing pseudorandomness of 160 bits
*/
function samlCreateId()
{
$rndChars = 'abcdefghijklmnop';
$rndId = '';
for ($i = 0; $i < 40; $i++ ) {
$rndId .= $rndChars[rand(0,strlen($rndChars)-1)];
}
return $rndId;
}
/**
* Returns a unix timestamp in xsd:dateTime format.
* @param timestamp int UNIX Timestamp to convert to xsd:dateTime
* ISO 8601 format.
* @return string
*/
function samlGetDateTime($timestamp)
{
return gmdate('Y-m-d\TH:i:s\Z', $timestamp);
}
/**
* Attempts to check whether a SAML date is valid. Returns true or false.
* @param string $samlDate
* @return bool
*/
function validSamlDateFormat($samlDate)
{
if ($samlDate == "") return false;
$indexT = strpos($samlDate, 'T');
$indexZ = strpos($samlDate, 'Z');
if (($indexT != 10) || ($indexZ != 19)) {
return false;
}
$dateString = substr($samlDate, 0, 10);
$timeString = substr($samlDate, $indexT + 1, 8);
list($year, $month, $day) = explode('-', $dateString);
list($hour, $minute, $second) = explode(':', $timeString);
$parsedDate = gmmktime($hour, $minute, $second, $month, $day, $year);
if (($parsedDate === false) || ($parsedDate == -1)) return false;
if (!checkdate($month, $day, $year)) return false;
return $parsedDate;
}
}
?>
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