2010-06-16 18:21:58 +00:00
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<?php
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/**
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* Contains all common PHP functions needed by most pages
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*/
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// Retain session variables across page requests
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session_start();
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// The settings below display error on the screen,
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// instead of giving blank pages.
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error_reporting(E_ALL);
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ini_set('display_errors', true);
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/**
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* Description: Run a command using the xCAT client/server protocol
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*
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* @param $cmd The xCAT command
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* $nr Node range or group
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* $args Command arguments
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* @return A tree of SimpleXML objects.
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* See perl-xCAT/xCAT/Client.pm for the format
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*/
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function docmd($cmd, $nr, $args){
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// If we are not logged in,
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// do not try to communicate with xcatd
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if (!is_logged()) {
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echo "<p>docmd: Not logged in - cannot run command</p>";
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return simplexml_load_string('<xcat></xcat>', 'SimpleXMLElement', LIBXML_NOCDATA);
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}
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$request = simplexml_load_string('<xcatrequest></xcatrequest>');
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$request->addChild('command', $cmd);
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if(!empty($nr)) { $request->addChild('noderange', $nr); }
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if (!empty($args)) {
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foreach ($args as $a) {
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$request->addChild('arg',$a);
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}
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}
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$usernode=$request->addChild('becomeuser');
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$usernode->addChild('username',$_SESSION["username"]);
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$usernode->addChild('password',getpassword());
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$xml = submit_request($request,0);
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return $xml;
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}
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/**
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* Used by docmd()
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*
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* @param $req Tree of SimpleXML objects
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* @return A tree of SimpleXML objects
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*/
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function submit_request($req, $skipVerify){
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$xcathost = "localhost";
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$port = "3001";
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$rsp = FALSE;
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$response = '';
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$cleanexit = 0;
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// Open a socket to xcatd
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if($fp = stream_socket_client('ssl://'.$xcathost.':'.$port, $errno, $errstr, 30, STREAM_CLIENT_CONNECT)){
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// The line below makes the call async
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// stream_set_blocking($fp, 0);
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fwrite($fp,$req->asXML()); // Send XML to xcatd
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while(!feof($fp)){ // Read until there is no more
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// Remove newlines and add it to the response
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$response .= preg_replace('/\n/', '', fread($fp, 8192));
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// Look for serverdone response
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$fullpattern = '/<xcatresponse>\s*<serverdone>\s*<\/serverdone>\s*<\/xcatresponse>/';
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$mixedpattern = '/<serverdone>\s*<\/serverdone>.*<\/xcatresponse>/';
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if(preg_match($mixedpattern,$response)) {
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// Transaction is done,
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// Package up XML and return it
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// Remove the serverdone response and put an xcat tag around the rest
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$count = 0;
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$response = preg_replace($fullpattern,'', $response, -1, $count); // 1st try to remove the long pattern
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if (!$count) { $response = preg_replace($mixedpattern,'', $response) . '</xcatresponse>/'; } // if its not there, then remove the short pattern
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$response = "<xcat>$response</xcat>";
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$rsp = simplexml_load_string($response,'SimpleXMLElement', LIBXML_NOCDATA);
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$cleanexit = 1;
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break;
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}
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}
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fclose($fp);
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}else{
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echo "<p>xCAT submit request socket error: $errno - $errstr</p>";
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}
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if(! $cleanexit){
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if (preg_match('/^\s*<xcatresponse>.*<\/xcatresponse>\s*$/',$response)) {
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// Probably an error message
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$response = "<xcat>$response</xcat>";
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$rsp = simplexml_load_string($response,'SimpleXMLElement', LIBXML_NOCDATA);
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}
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elseif(!$skipVerify){
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echo "<p>(Error) xCAT response ended prematurely: ", htmlentities($response), "</p>";
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$rsp = FALSE;
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}
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}
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return $rsp;
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}
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/**
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* Enable password storage to split between cookie and session variable
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*
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* @param $data
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* $key
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* @return
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*/
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2010-07-19 18:28:31 +00:00
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function xorcrypt($data, $key) {
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2010-06-16 18:21:58 +00:00
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$datalen = strlen($data);
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$keylen = strlen($key);
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for ($i=0;$i<$datalen;$i++) {
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$data[$i] = chr(ord($data[$i])^ord($key[$i]));
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}
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return $data;
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}
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/**
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* Get password
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*
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* @param Nothing
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* @return
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*/
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function getpassword() {
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if (isset($GLOBALS['xcatauthsecret'])) {
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$cryptext = $GLOBALS['xcatauthsecret'];
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} else if (isset($_COOKIE["xcatauthsecret"])) {
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$cryptext = $_COOKIE["xcatauthsecret"];
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} else {
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return false;
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}
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return xorcrypt($_SESSION["secretkey"], base64_decode($cryptext));
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}
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/**
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* Get the password splitting knowledge between server
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* and client side persistant storage. Caller should regenerate
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2010-07-19 18:28:31 +00:00
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* session ID when contemplating a new user/password, to preclude
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2010-06-16 18:21:58 +00:00
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* session fixation, though fixation is limited without the secret.
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*
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* @param $password Password
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* @return Nothing
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*/
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function setpassword($password) {
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$randlen = strlen($password);
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$key = getrandchars($randlen);
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$cryptext = xorcrypt($password,$key);
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// Non-ascii characters, encode it in base64
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$cryptext = base64_encode($cryptext);
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setcookie("xcatauthsecret",$cryptext,0,'/');
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$GLOBALS["xcatauthsecret"] = $cryptext;
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$_SESSION["secretkey"] = $key;
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}
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/**
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2010-07-19 18:28:31 +00:00
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* Get RAND characters
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2010-06-16 18:21:58 +00:00
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*
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* @param $length Length of characters
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* @return RAND characters
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*/
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function getrandchars($length) {
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$charset = '0123456789abcdefghijklmnopqrstuvwxyz!@#$%^&*';
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$charsize = strlen($charset);
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srand();
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$chars = '';
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for ($i=0;$i<$length;$i++) {
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$num=rand()%$charsize;
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$chars=$chars.substr($charset,$num,1);
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}
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return $chars;
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}
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/**
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* Determine if a user/password session exists
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*
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* @param Nothing
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* @return True If user has a session.
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* False Otherwise
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*/
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function is_logged() {
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if (isset($_SESSION["username"]) and !is_bool(getpassword())) {
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return true;
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} else {
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return false;
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}
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}
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/**
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* Determine if a user is currently logged in successfully
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*
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* @param Nothing
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* @return True If the user is currently logged in successfully
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* False Otherwise
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*/
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function isAuthenticated() {
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if (is_logged()) {
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if ($_SESSION["xcatpassvalid"] != 1) {
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$testcred = docmd("authcheck", "", NULL);
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if (isset($testcred->{'xcatresponse'}->{'data'})) {
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$result = "".$testcred->{'xcatresponse'}->{'data'};
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if (is_numeric(strpos("Authenticated",$result))) {
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// Logged in successfully
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$_SESSION["xcatpassvalid"] = 1;
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} else {
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// Not logged in
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$_SESSION["xcatpassvalid"] = 0;
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}
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}
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}
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}
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if (isset($_SESSION["xcatpassvalid"]) and $_SESSION["xcatpassvalid"]==1) {
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return true;
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} else {
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return false;
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}
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}
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/**
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* Log out of the current user session
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*
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* @param Nothing
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* @return Nothing
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*/
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function logout() {
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// Clear the secret cookie from browser
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if (isset($_COOKIE["xcatauthsecret"])) {
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setcookie("xcatauthsecret",'',time()-86400*7,'/');
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}
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// Expire session cookie
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if (isset($_COOKIE[session_name()])) {
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setcookie(session_name(),"",time()-86400*7,"/");
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}
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// Clear server store of data
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$_SESSION=array();
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session_destroy();
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}
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?>
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