mnet/lib.php

   1 <?php
   2 /**
   3  * Library functions for mnet
   4  *
   5  * @author  Donal McMullan  donal@catalyst.net.nz
   6  * @version 0.0.1
   7  * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
   8  * @package mnet
   9  */
  10 require_once $CFG->dirroot.'/mnet/xmlrpc/xmlparser.php';
  11 require_once $CFG->dirroot.'/mnet/peer.php';
  12 require_once $CFG->dirroot.'/mnet/environment.php';
  13
  14 /// CONSTANTS ///////////////////////////////////////////////////////////
  15
  16 define('RPC_OK',                0);
  17 define('RPC_NOSUCHFILE',        1);
  18 define('RPC_NOSUCHCLASS',       2);
  19 define('RPC_NOSUCHFUNCTION',    3);
  20 define('RPC_FORBIDDENFUNCTION', 4);
  21 define('RPC_NOSUCHMETHOD',      5);
  22 define('RPC_FORBIDDENMETHOD',   6);
  23
  24 /**
  25  * Strip extraneous detail from a URL or URI and return the hostname
  26  *
  27  * @param  string  $uri  The URI of a file on the remote computer, optionally
  28  *                       including its http:// prefix like
  29  *                       http://www.example.com/index.html
  30  * @return string        Just the hostname
  31  */
  32 function mnet_get_hostname_from_uri($uri = null) {
  33     $count = preg_match("@^(?:http[s]?://)?([A-Z0-9\-\.]+).*@i", $uri, $matches);
  34     if ($count > 0) return $matches[1];
  35     return false;
  36 }
  37
  38 /**
  39  * Get the remote machine's SSL Cert
  40  *
  41  * @param  string  $uri     The URI of a file on the remote computer, including
  42  *                          its http:// or https:// prefix
  43  * @return string           A PEM formatted SSL Certificate.
  44  */
  45 function mnet_get_public_key($uri, $application=null) {
  46     global $CFG, $DB;
  47     $mnet = get_mnet_environment();
  48     // The key may be cached in the mnet_set_public_key function...
  49     // check this first
  50     $key = mnet_set_public_key($uri);
  51     if ($key != false) {
  52         return $key;
  53     }
  54
  55     if (empty($application)) {
  56         $application = $DB->get_record('mnet_application', array('name'=>'moodle'));
  57     }
  58
  59     $rq = xmlrpc_encode_request('system/keyswap', array($CFG->wwwroot, $mnet->public_key, $application->name), array("encoding" => "utf-8"));
  60     $ch = curl_init($uri . $application->xmlrpc_server_url);
  61
  62     curl_setopt($ch, CURLOPT_TIMEOUT, 60);
  63     curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  64     curl_setopt($ch, CURLOPT_POST, true);
  65     curl_setopt($ch, CURLOPT_USERAGENT, 'Moodle');
  66     curl_setopt($ch, CURLOPT_POSTFIELDS, $rq);
  67     curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type: text/xml charset=UTF-8"));
  68     curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
  69     curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
  70
  71     // check for proxy
  72     if (!empty($CFG->proxyhost) and !is_proxybypass($uri)) {
  73         // SOCKS supported in PHP5 only
  74         if (!empty($CFG->proxytype) and ($CFG->proxytype == 'SOCKS5')) {
  75             if (defined('CURLPROXY_SOCKS5')) {
  76                 curl_setopt($ch, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
  77             } else {
  78                 curl_close($ch);
  79                 print_error( 'socksnotsupported','mnet' );
  80             }
  81         }
  82
  83         curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, false);
  84
  85         if (empty($CFG->proxyport)) {
  86             curl_setopt($ch, CURLOPT_PROXY, $CFG->proxyhost);
  87         } else {
  88             curl_setopt($ch, CURLOPT_PROXY, $CFG->proxyhost.':'.$CFG->proxyport);
  89         }
  90
  91         if (!empty($CFG->proxyuser) and !empty($CFG->proxypassword)) {
  92             curl_setopt($ch, CURLOPT_PROXYUSERPWD, $CFG->proxyuser.':'.$CFG->proxypassword);
  93             if (defined('CURLOPT_PROXYAUTH')) {
  94                 // any proxy authentication if PHP 5.1
  95                 curl_setopt($ch, CURLOPT_PROXYAUTH, CURLAUTH_BASIC | CURLAUTH_NTLM);
  96             }
  97         }
  98     }
  99
 100     $res = xmlrpc_decode(curl_exec($ch));
 101
 102     // check for curl errors
 103     $curlerrno = curl_errno($ch);
 104     if ($curlerrno!=0) {
 105         debugging("Request for $uri failed with curl error $curlerrno");
 106     }
 107
 108     // check HTTP error code
 109     $info =  curl_getinfo($ch);
 110     if (!empty($info['http_code']) and ($info['http_code'] != 200)) {
 111         debugging("Request for $uri failed with HTTP code ".$info['http_code']);
 112     }
 113
 114     curl_close($ch);
 115
 116     if (!is_array($res)) { // ! error
 117         $public_certificate = $res;
 118         $credentials=array();
 119         if (strlen(trim($public_certificate))) {
 120             $credentials = openssl_x509_parse($public_certificate);
 121             $host = $credentials['subject']['CN'];
 122             if (array_key_exists( 'subjectAltName', $credentials['subject'])) {
 123                 $host = $credentials['subject']['subjectAltName'];
 124             }
 125             if (strpos($uri, $host) !== false) {
 126                 mnet_set_public_key($uri, $public_certificate);
 127                 return $public_certificate;
 128             }
 129             else {
 130                 debugging("Request for $uri returned public key for different URI - $host");
 131             }
 132         }
 133         else {
 134             debugging("Request for $uri returned empty response");
 135         }
 136     }
 137     else {
 138         debugging( "Request for $uri returned unexpected result");
 139     }
 140     return false;
 141 }
 142
 143 /**
 144  * Store a URI's public key in a static variable, or retrieve the key for a URI
 145  *
 146  * @param  string  $uri  The URI of a file on the remote computer, including its
 147  *                       https:// prefix
 148  * @param  mixed   $key  A public key to store in the array OR null. If the key
 149  *                       is null, the function will return the previously stored
 150  *                       key for the supplied URI, should it exist.
 151  * @return mixed         A public key OR true/false.
 152  */
 153 function mnet_set_public_key($uri, $key = null) {
 154     static $keyarray = array();
 155     if (isset($keyarray[$uri]) && empty($key)) {
 156         return $keyarray[$uri];
 157     } elseif (!empty($key)) {
 158         $keyarray[$uri] = $key;
 159         return true;
 160     }
 161     return false;
 162 }
 163
 164 /**
 165  * Sign a message and return it in an XML-Signature document
 166  *
 167  * This function can sign any content, but it was written to provide a system of
 168  * signing XML-RPC request and response messages. The message will be base64
 169  * encoded, so it does not need to be text.
 170  *
 171  * We compute the SHA1 digest of the message.
 172  * We compute a signature on that digest with our private key.
 173  * We link to the public key that can be used to verify our signature.
 174  * We base64 the message data.
 175  * We identify our wwwroot - this must match our certificate's CN
 176  *
 177  * The XML-RPC document will be parceled inside an XML-SIG document, which holds
 178  * the base64_encoded XML as an object, the SHA1 digest of that document, and a
 179  * signature of that document using the local private key. This signature will
 180  * uniquely identify the RPC document as having come from this server.
 181  *
 182  * See the {@Link http://www.w3.org/TR/xmldsig-core/ XML-DSig spec} at the W3c
 183  * site
 184  *
 185  * @param  string   $message              The data you want to sign
 186  * @param  resource $privatekey           The private key to sign the response with
 187  * @return string                         An XML-DSig document
 188  */
 189 function mnet_sign_message($message, $privatekey = null) {
 190     global $CFG;
 191     $digest = sha1($message);
 192
 193     $mnet = get_mnet_environment();
 194     // If the user hasn't supplied a private key (for example, one of our older,
 195     //  expired private keys, we get the current default private key and use that.
 196     if ($privatekey == null) {
 197         $privatekey = $mnet->get_private_key();
 198     }
 199
 200     // The '$sig' value below is returned by reference.
 201     // We initialize it first to stop my IDE from complaining.
 202     $sig  = '';
 203     $bool = openssl_sign($message, $sig, $privatekey); // TODO: On failure?
 204
 205     $message = '<?xml version="1.0" encoding="iso-8859-1"?>
 206     <signedMessage>
 207         <Signature Id="MoodleSignature" xmlns="http://www.w3.org/2000/09/xmldsig#">
 208             <SignedInfo>
 209                 <CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/>
 210                 <SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/>
 211                 <Reference URI="#XMLRPC-MSG">
 212                     <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
 213                     <DigestValue>'.$digest.'</DigestValue>
 214                 </Reference>
 215             </SignedInfo>
 216             <SignatureValue>'.base64_encode($sig).'</SignatureValue>
 217             <KeyInfo>
 218                 <RetrievalMethod URI="'.$CFG->wwwroot.'/mnet/publickey.php"/>
 219             </KeyInfo>
 220         </Signature>
 221         <object ID="XMLRPC-MSG">'.base64_encode($message).'</object>
 222         <wwwroot>'.$mnet->wwwroot.'</wwwroot>
 223         <timestamp>'.time().'</timestamp>
 224     </signedMessage>';
 225     return $message;
 226 }
 227
 228 /**
 229  * Encrypt a message and return it in an XML-Encrypted document
 230  *
 231  * This function can encrypt any content, but it was written to provide a system
 232  * of encrypting XML-RPC request and response messages. The message will be
 233  * base64 encoded, so it does not need to be text - binary data should work.
 234  *
 235  * We compute the SHA1 digest of the message.
 236  * We compute a signature on that digest with our private key.
 237  * We link to the public key that can be used to verify our signature.
 238  * We base64 the message data.
 239  * We identify our wwwroot - this must match our certificate's CN
 240  *
 241  * The XML-RPC document will be parceled inside an XML-SIG document, which holds
 242  * the base64_encoded XML as an object, the SHA1 digest of that document, and a
 243  * signature of that document using the local private key. This signature will
 244  * uniquely identify the RPC document as having come from this server.
 245  *
 246  * See the {@Link http://www.w3.org/TR/xmlenc-core/ XML-ENC spec} at the W3c
 247  * site
 248  *
 249  * @param  string   $message              The data you want to sign
 250  * @param  string   $remote_certificate   Peer's certificate in PEM format
 251  * @return string                         An XML-ENC document
 252  */
 253 function mnet_encrypt_message($message, $remote_certificate) {
 254     $mnet = get_mnet_environment();
 255
 256     // Generate a key resource from the remote_certificate text string
 257     $publickey = openssl_get_publickey($remote_certificate);
 258
 259     if ( gettype($publickey) != 'resource' ) {
 260         // Remote certificate is faulty.
 261         return false;
 262     }
 263
 264     // Initialize vars
 265     $encryptedstring = '';
 266     $symmetric_keys = array();
 267
 268     //        passed by ref ->     &$encryptedstring &$symmetric_keys
 269     $bool = openssl_seal($message, $encryptedstring, $symmetric_keys, array($publickey));
 270     $message = $encryptedstring;
 271     $symmetrickey = array_pop($symmetric_keys);
 272
 273     $message = '<?xml version="1.0" encoding="iso-8859-1"?>
 274     <encryptedMessage>
 275         <EncryptedData Id="ED" xmlns="http://www.w3.org/2001/04/xmlenc#">
 276             <EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#arcfour"/>
 277             <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
 278                 <ds:RetrievalMethod URI="#EK" Type="http://www.w3.org/2001/04/xmlenc#EncryptedKey"/>
 279                 <ds:KeyName>XMLENC</ds:KeyName>
 280             </ds:KeyInfo>
 281             <CipherData>
 282                 <CipherValue>'.base64_encode($message).'</CipherValue>
 283             </CipherData>
 284         </EncryptedData>
 285         <EncryptedKey Id="EK" xmlns="http://www.w3.org/2001/04/xmlenc#">
 286             <EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#rsa-1_5"/>
 287             <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
 288                 <ds:KeyName>SSLKEY</ds:KeyName>
 289             </ds:KeyInfo>
 290             <CipherData>
 291                 <CipherValue>'.base64_encode($symmetrickey).'</CipherValue>
 292             </CipherData>
 293             <ReferenceList>
 294                 <DataReference URI="#ED"/>
 295             </ReferenceList>
 296             <CarriedKeyName>XMLENC</CarriedKeyName>
 297         </EncryptedKey>
 298         <wwwroot>'.$mnet->wwwroot.'</wwwroot>
 299     </encryptedMessage>';
 300     return $message;
 301 }
 302
 303 /**
 304  * Get your SSL keys from the database, or create them (if they don't exist yet)
 305  *
 306  * Get your SSL keys from the database, or (if they don't exist yet) call
 307  * mnet_generate_keypair to create them
 308  *
 309  * @param   string  $string     The text you want to sign
 310  * @return  string              The signature over that text
 311  */
 312 function mnet_get_keypair() {
 313     global $CFG, $DB;
 314     static $keypair = null;
 315     if (!is_null($keypair)) return $keypair;
 316     if ($result = get_config('mnet', 'openssl')) {
 317         list($keypair['certificate'], $keypair['keypair_PEM']) = explode('@@@@@@@@', $result);
 318         $keypair['privatekey'] = openssl_pkey_get_private($keypair['keypair_PEM']);
 319         $keypair['publickey']  = openssl_pkey_get_public($keypair['certificate']);
 320         return $keypair;
 321     } else {
 322         $keypair = mnet_generate_keypair();
 323         return $keypair;
 324     }
 325 }
 326
 327 /**
 328  * Generate public/private keys and store in the config table
 329  *
 330  * Use the distinguished name provided to create a CSR, and then sign that CSR
 331  * with the same credentials. Store the keypair you create in the config table.
 332  * If a distinguished name is not provided, create one using the fullname of
 333  * 'the course with ID 1' as your organization name, and your hostname (as
 334  * detailed in $CFG->wwwroot).
 335  *
 336  * @param   array  $dn  The distinguished name of the server
 337  * @return  string      The signature over that text
 338  */
 339 function mnet_generate_keypair($dn = null, $days=28) {
 340     global $CFG, $USER, $DB;
 341
 342     // check if lifetime has been overriden
 343     if (!empty($CFG->mnetkeylifetime)) {
 344         $days = $CFG->mnetkeylifetime;
 345     }
 346
 347     $host = strtolower($CFG->wwwroot);
 348     $host = preg_replace("~^http(s)?://~",'',$host);
 349     $break = strpos($host.'/' , '/');
 350     $host   = substr($host, 0, $break);
 351
 352     $site = get_site();
 353     $organization = $site->fullname;
 354
 355     $keypair = array();
 356
 357     $country  = 'NZ';
 358     $province = 'Wellington';
 359     $locality = 'Wellington';
 360     $email    = !empty($CFG->noreplyaddress) ? $CFG->noreplyaddress : 'noreply@'.$_SERVER['HTTP_HOST'];
 361
 362     if(!empty($USER->country)) {
 363         $country  = $USER->country;
 364     }
 365     if(!empty($USER->city)) {
 366         $province = $USER->city;
 367         $locality = $USER->city;
 368     }
 369     if(!empty($USER->email)) {
 370         $email    = $USER->email;
 371     }
 372
 373     if (is_null($dn)) {
 374         $dn = array(
 375            "countryName" => $country,
 376            "stateOrProvinceName" => $province,
 377            "localityName" => $locality,
 378            "organizationName" => $organization,
 379            "organizationalUnitName" => 'Moodle',
 380            "commonName" => substr($CFG->wwwroot, 0, 64),
 381            "subjectAltName" => $CFG->wwwroot,
 382            "emailAddress" => $email
 383         );
 384     }
 385
 386     $dnlimits = array(
 387            'countryName'            => 2,
 388            'stateOrProvinceName'    => 128,
 389            'localityName'           => 128,
 390            'organizationName'       => 64,
 391            'organizationalUnitName' => 64,
 392            'commonName'             => 64,
 393            'emailAddress'           => 128
 394     );
 395
 396     foreach ($dnlimits as $key => $length) {
 397         $dn[$key] = substr($dn[$key], 0, $length);
 398     }
 399
 400     // ensure we remove trailing slashes
 401     $dn["commonName"] = preg_replace(':/$:', '', $dn["commonName"]);
 402     if (!empty($CFG->opensslcnf)) { //allow specification of openssl.cnf especially for Windows installs
 403         $new_key = openssl_pkey_new(array("config" => $CFG->opensslcnf));
 404     } else {
 405         $new_key = openssl_pkey_new();
 406     }
 407     if ($new_key === false) {
 408         // can not generate keys - missing openssl.cnf??
 409         return null;
 410     }
 411     if (!empty($CFG->opensslcnf)) { //allow specification of openssl.cnf especially for Windows installs
 412         $csr_rsc = openssl_csr_new($dn, $new_key, array("config" => $CFG->opensslcnf));
 413         $selfSignedCert = openssl_csr_sign($csr_rsc, null, $new_key, $days, array("config" => $CFG->opensslcnf));
 414     } else {
 415         $csr_rsc = openssl_csr_new($dn, $new_key, array('private_key_bits',2048));
 416         $selfSignedCert = openssl_csr_sign($csr_rsc, null, $new_key, $days);
 417     }
 418     unset($csr_rsc); // Free up the resource
 419
 420     // We export our self-signed certificate to a string.
 421     openssl_x509_export($selfSignedCert, $keypair['certificate']);
 422     openssl_x509_free($selfSignedCert);
 423
 424     // Export your public/private key pair as a PEM encoded string. You
 425     // can protect it with an optional passphrase if you wish.
 426     if (!empty($CFG->opensslcnf)) { //allow specification of openssl.cnf especially for Windows installs
 427         $export = openssl_pkey_export($new_key, $keypair['keypair_PEM'], null, array("config" => $CFG->opensslcnf));
 428     } else {
 429         $export = openssl_pkey_export($new_key, $keypair['keypair_PEM'] /* , $passphrase */);
 430     }
 431     openssl_pkey_free($new_key);
 432     unset($new_key); // Free up the resource
 433
 434     return $keypair;
 435 }
 436
 437
 438 function mnet_update_sso_access_control($username, $mnet_host_id, $accessctrl) {
 439     global $DB;
 440
 441     $mnethost = $DB->get_record('mnet_host', array('id'=>$mnet_host_id));
 442     if ($aclrecord = $DB->get_record('mnet_sso_access_control', array('username'=>$username, 'mnet_host_id'=>$mnet_host_id))) {
 443         // update
 444         $aclrecord->accessctrl = $accessctrl;
 445         $DB->update_record('mnet_sso_access_control', $aclrecord);
 446         add_to_log(SITEID, 'admin/mnet', 'update', 'admin/mnet/access_control.php',
 447                 "SSO ACL: $accessctrl user '$username' from {$mnethost->name}");
 448     } else {
 449         // insert
 450         $aclrecord = new stdClass();
 451         $aclrecord->username = $username;
 452         $aclrecord->accessctrl = $accessctrl;
 453         $aclrecord->mnet_host_id = $mnet_host_id;
 454         $id = $DB->insert_record('mnet_sso_access_control', $aclrecord);
 455         add_to_log(SITEID, 'admin/mnet', 'add', 'admin/mnet/access_control.php',
 456                 "SSO ACL: $accessctrl user '$username' from {$mnethost->name}");
 457     }
 458     return true;
 459 }
 460
 461 function mnet_get_peer_host ($mnethostid) {
 462     global $DB;
 463     static $hosts;
 464     if (!isset($hosts[$mnethostid])) {
 465         $host = $DB->get_record('mnet_host', array('id' => $mnethostid));
 466         $hosts[$mnethostid] = $host;
 467     }
 468     return $hosts[$mnethostid];
 469 }
 470
 471 /**
 472  * Inline function to modify a url string so that mnet users are requested to
 473  * log in at their mnet identity provider (if they are not already logged in)
 474  * before ultimately being directed to the original url.
 475  *
 476  * @param string $jumpurl the url which user should initially be directed to.
 477  *     This is a URL associated with a moodle networking peer when it
 478  *     is fulfiling a role as an identity provider (IDP). Different urls for
 479  *     different peers, the jumpurl is formed partly from the IDP's webroot, and
 480  *     partly from a predefined local path within that webwroot.
 481  *     The result of the user hitting this jump url is that they will be asked
 482  *     to login (at their identity provider (if they aren't already)), mnet
 483  *     will prepare the necessary authentication information, then redirect
 484  *     them back to somewhere at the content provider(CP) moodle (this moodle)
 485  * @param array $url array with 2 elements
 486  *     0 - context the url was taken from, possibly just the url, possibly href="url"
 487  *     1 - the destination url
 488  * @return string the url the remote user should be supplied with.
 489  */
 490 function mnet_sso_apply_indirection ($jumpurl, $url) {
 491     global $USER, $CFG;
 492
 493     $localpart='';
 494     $urlparts = parse_url($url[1]);
 495     if($urlparts) {
 496         if (isset($urlparts['path'])) {
 497             $path = $urlparts['path'];
 498             // if our wwwroot has a path component, need to strip that path from beginning of the
 499             // 'localpart' to make it relative to moodle's wwwroot
 500             $wwwrootpath = parse_url($CFG->wwwroot, PHP_URL_PATH);
 501             if (!empty($wwwrootpath) and strpos($path, $wwwrootpath) === 0) {
 502                 $path = substr($path, strlen($wwwrootpath));
 503             }
 504             $localpart .= $path;
 505         }
 506         if (isset($urlparts['query'])) {
 507             $localpart .= '?'.$urlparts['query'];
 508         }
 509         if (isset($urlparts['fragment'])) {
 510             $localpart .= '#'.$urlparts['fragment'];
 511         }
 512     }
 513     $indirecturl = $jumpurl . urlencode($localpart);
 514     //If we matched on more than just a url (ie an html link), return the url to an href format
 515     if ($url[0] != $url[1]) {
 516         $indirecturl = 'href="'.$indirecturl.'"';
 517     }
 518     return $indirecturl;
 519 }
 520
 521 function mnet_get_app_jumppath ($applicationid) {
 522     global $DB;
 523     static $appjumppaths;
 524     if (!isset($appjumppaths[$applicationid])) {
 525         $ssojumpurl = $DB->get_field('mnet_application', 'sso_jump_url', array('id' => $applicationid));
 526         $appjumppaths[$applicationid] = $ssojumpurl;
 527     }
 528     return $appjumppaths[$applicationid];
 529 }
 530
 531
 532 /**
 533  * Output debug information about mnet.  this will go to the <b>error_log</b>.
 534  *
 535  * @param mixed $debugdata this can be a string, or array or object.
 536  * @param int   $debuglevel optional , defaults to 1. bump up for very noisy debug info
 537  */
 538 function mnet_debug($debugdata, $debuglevel=1) {
 539     global $CFG;
 540     $setlevel = get_config('', 'mnet_rpcdebug');
 541     if (empty($setlevel) || $setlevel < $debuglevel) {
 542         return;
 543     }
 544     if (is_object($debugdata)) {
 545         $debugdata = (array)$debugdata;
 546     }
 547     if (is_array($debugdata)) {
 548         mnet_debug('DUMPING ARRAY');
 549         foreach ($debugdata as $key => $value) {
 550             mnet_debug("$key: $value");
 551         }
 552         mnet_debug('END DUMPING ARRAY');
 553         return;
 554     }
 555     $prefix = 'MNET DEBUG ';
 556     if (defined('MNET_SERVER')) {
 557         $prefix .= " (server $CFG->wwwroot";
 558         if ($peer = get_mnet_remote_client() && !empty($peer->wwwroot)) {
 559             $prefix .= ", remote peer " . $peer->wwwroot;
 560         }
 561         $prefix .= ')';
 562     } else {
 563         $prefix .= " (client $CFG->wwwroot) ";
 564     }
 565     error_log("$prefix $debugdata");
 566 }
 567
 568 /**
 569  * Return an array of information about all moodle's profile fields
 570  * which ones are optional, which ones are forced.
 571  * This is used as the basis of providing lists of profile fields to the administrator
 572  * to pick which fields to import/export over MNET
 573  *
 574  * @return array(forced => array, optional => array)
 575  */
 576 function mnet_profile_field_options() {
 577     global $DB;
 578     static $info;
 579     if (!empty($info)) {
 580         return $info;
 581     }
 582
 583     $excludes = array(
 584         'id',              // makes no sense
 585         'mnethostid',      // makes no sense
 586         'timecreated',     // will be set to relative to the host anyway
 587         'timemodified',    // will be set to relative to the host anyway
 588         'auth',            // going to be set to 'mnet'
 589         'deleted',         // we should never get deleted users sent over, but don't send this anyway
 590         'confirmed',       // unconfirmed users can't log in to their home site, all remote users considered confirmed
 591         'password',        // no password for mnet users
 592         'theme',           // handled separately
 593         'lastip',          // will be set to relative to the host anyway
 594     );
 595
 596     // these are the ones that user_not_fully_set_up will complain about
 597     // and also special case ones
 598     $forced = array(
 599         'username',
 600         'email',
 601         'firstname',
 602         'lastname',
 603         'auth',
 604         'wwwroot',
 605         'session.gc_lifetime',
 606         '_mnet_userpicture_timemodified',
 607         '_mnet_userpicture_mimetype',
 608     );
 609
 610     // these are the ones we used to send/receive (pre 2.0)
 611     $legacy = array(
 612         'username',
 613         'email',
 614         'auth',
 615         'deleted',
 616         'firstname',
 617         'lastname',
 618         'city',
 619         'country',
 620         'lang',
 621         'timezone',
 622         'description',
 623         'mailformat',
 624         'maildigest',
 625         'maildisplay',
 626         'htmleditor',
 627         'wwwroot',
 628         'picture',
 629     );
 630
 631     // get a random user record from the database to pull the fields off
 632     $randomuser = $DB->get_record('user', array(), '*', IGNORE_MULTIPLE);
 633     foreach ($randomuser as $key => $discard) {
 634         if (in_array($key, $excludes) || in_array($key, $forced)) {
 635             continue;
 636         }
 637         $fields[$key] = $key;
 638     }
 639     $info = array(
 640         'forced'   => $forced,
 641         'optional' => $fields,
 642         'legacy'   => $legacy,
 643     );
 644     return $info;
 645 }
 646
 647
 648 /**
 649  * Returns information about MNet peers
 650  *
 651  * @param bool $withdeleted should the deleted peers be returned too
 652  * @return array
 653  */
 654 function mnet_get_hosts($withdeleted = false) {
 655     global $CFG, $DB;
 656
 657     $sql = "SELECT h.id, h.deleted, h.wwwroot, h.ip_address, h.name, h.public_key, h.public_key_expires,
 658                    h.transport, h.portno, h.last_connect_time, h.last_log_id, h.applicationid,
 659                    a.name as app_name, a.display_name as app_display_name, a.xmlrpc_server_url
 660               FROM {mnet_host} h
 661               JOIN {mnet_application} a ON h.applicationid = a.id
 662              WHERE h.id <> ?";
 663
 664     if (!$withdeleted) {
 665         $sql .= "  AND h.deleted = 0";
 666     }
 667
 668     $sql .= " ORDER BY h.deleted, h.name, h.id";
 669
 670     return $DB->get_records_sql($sql, array($CFG->mnet_localhost_id));
 671 }
 672
 673
 674 /**
 675  * return an array information about services enabled for the given peer.
 676  * in two modes, fulldata or very basic data.
 677  *
 678  * @param mnet_peer $mnet_peer the peer to get information abut
 679  * @param boolean   $fulldata whether to just return which services are published/subscribed, or more information (defaults to full)
 680  *
 681  * @return array  If $fulldata is false, an array is returned like:
 682  *                publish => array(
 683  *                    serviceid => boolean,
 684  *                    serviceid => boolean,
 685  *                ),
 686  *                subscribe => array(
 687  *                    serviceid => boolean,
 688  *                    serviceid => boolean,
 689  *                )
 690  *                If $fulldata is true, an array is returned like:
 691  *                servicename => array(
 692  *                   apiversion => array(
 693  *                        name           => string
 694  *                        offer          => boolean
 695  *                        apiversion     => int
 696  *                        plugintype     => string
 697  *                        pluginname     => string
 698  *                        hostsubscribes => boolean
 699  *                        hostpublishes  => boolean
 700  *                   ),
 701  *               )
 702  */
 703 function mnet_get_service_info(mnet_peer $mnet_peer, $fulldata=true) {
 704     global $CFG, $DB;
 705
 706     $requestkey = (!empty($fulldata) ? 'fulldata' : 'mydata');
 707
 708     static $cache = array();
 709     if (array_key_exists($mnet_peer->id, $cache)) {
 710         return $cache[$mnet_peer->id][$requestkey];
 711     }
 712
 713     $id_list = $mnet_peer->id;
 714     if (!empty($CFG->mnet_all_hosts_id)) {
 715         $id_list .= ', '.$CFG->mnet_all_hosts_id;
 716     }
 717
 718     $concat = $DB->sql_concat('COALESCE(h2s.id,0) ', ' \'-\' ', ' svc.id', '\'-\'', 'r.plugintype', '\'-\'', 'r.pluginname');
 719
 720     $query = "
 721         SELECT DISTINCT
 722             $concat as id,
 723             svc.id as serviceid,
 724             svc.name,
 725             svc.offer,
 726             svc.apiversion,
 727             r.plugintype,
 728             r.pluginname,
 729             h2s.hostid,
 730             h2s.publish,
 731             h2s.subscribe
 732         FROM
 733             {mnet_service2rpc} s2r,
 734             {mnet_rpc} r,
 735             {mnet_service} svc
 736         LEFT JOIN
 737             {mnet_host2service} h2s
 738         ON
 739             h2s.hostid in ($id_list) AND
 740             h2s.serviceid = svc.id
 741         WHERE
 742             svc.offer = '1' AND
 743             s2r.serviceid = svc.id AND
 744             s2r.rpcid = r.id
 745         ORDER BY
 746             svc.name ASC";
 747
 748     $resultset = $DB->get_records_sql($query);
 749
 750     if (is_array($resultset)) {
 751         $resultset = array_values($resultset);
 752     } else {
 753         $resultset = array();
 754     }
 755
 756     require_once $CFG->dirroot.'/mnet/xmlrpc/client.php';
 757
 758     $remoteservices = array();
 759     if ($mnet_peer->id != $CFG->mnet_all_hosts_id) {
 760         // Create a new request object
 761         $mnet_request = new mnet_xmlrpc_client();
 762
 763         // Tell it the path to the method that we want to execute
 764         $mnet_request->set_method('system/listServices');
 765         $mnet_request->send($mnet_peer);
 766         if (is_array($mnet_request->response)) {
 767             foreach($mnet_request->response as $service) {
 768                 $remoteservices[$service['name']][$service['apiversion']] = $service;
 769             }
 770         }
 771     }
 772
 773     $myservices = array();
 774     $mydata = array();
 775     foreach($resultset as $result) {
 776         $result->hostpublishes  = false;
 777         $result->hostsubscribes = false;
 778         if (isset($remoteservices[$result->name][$result->apiversion])) {
 779             if ($remoteservices[$result->name][$result->apiversion]['publish'] == 1) {
 780                 $result->hostpublishes  = true;
 781             }
 782             if ($remoteservices[$result->name][$result->apiversion]['subscribe'] == 1) {
 783                 $result->hostsubscribes  = true;
 784             }
 785         }
 786
 787         if (empty($myservices[$result->name][$result->apiversion])) {
 788             $myservices[$result->name][$result->apiversion] = array('serviceid' => $result->serviceid,
 789                                                                     'name' => $result->name,
 790                                                                     'offer' => $result->offer,
 791                                                                     'apiversion' => $result->apiversion,
 792                                                                     'plugintype' => $result->plugintype,
 793                                                                     'pluginname' => $result->pluginname,
 794                                                                     'hostsubscribes' => $result->hostsubscribes,
 795                                                                     'hostpublishes' => $result->hostpublishes
 796                                                                     );
 797         }
 798
 799         // allhosts_publish allows us to tell the admin that even though he
 800         // is disabling a service, it's still available to the host because
 801         // he's also publishing it to 'all hosts'
 802         if ($result->hostid == $CFG->mnet_all_hosts_id && $CFG->mnet_all_hosts_id != $mnet_peer->id) {
 803             $myservices[$result->name][$result->apiversion]['allhosts_publish'] = $result->publish;
 804             $myservices[$result->name][$result->apiversion]['allhosts_subscribe'] = $result->subscribe;
 805         } elseif (!empty($result->hostid)) {
 806             $myservices[$result->name][$result->apiversion]['I_publish'] = $result->publish;
 807             $myservices[$result->name][$result->apiversion]['I_subscribe'] = $result->subscribe;
 808         }
 809         $mydata['publish'][$result->serviceid] = $result->publish;
 810         $mydata['subscribe'][$result->serviceid] = $result->subscribe;
 811
 812     }
 813
 814     $cache[$mnet_peer->id]['fulldata'] = $myservices;
 815     $cache[$mnet_peer->id]['mydata'] = $mydata;
 816
 817     return $cache[$mnet_peer->id][$requestkey];
 818 }
 819
 820 /**
 821  * return an array of the profile fields to send
 822  * with user information to the given mnet host.
 823  *
 824  * @param mnet_peer $peer the peer to send the information to
 825  *
 826  * @return array (like 'username', 'firstname', etc)
 827  */
 828 function mnet_fields_to_send(mnet_peer $peer) {
 829     return _mnet_field_helper($peer, 'export');
 830 }
 831
 832 /**
 833  * return an array of the profile fields to import
 834  * from the given host, when creating/updating user accounts
 835  *
 836  * @param mnet_peer $peer the peer we're getting the information from
 837  *
 838  * @return array (like 'username', 'firstname', etc)
 839  */
 840 function mnet_fields_to_import(mnet_peer $peer) {
 841     return _mnet_field_helper($peer, 'import');
 842 }
 843
 844 /**
 845  * helper for {@see mnet_fields_to_import} and {@mnet_fields_to_send}
 846  *
 847  * @access private
 848  *
 849  * @param mnet_peer $peer the peer object
 850  * @param string    $key 'import' or 'export'
 851  *
 852  * @return array (like 'username', 'firstname', etc)
 853  */
 854 function _mnet_field_helper(mnet_peer $peer, $key) {
 855     $tmp = mnet_profile_field_options();
 856     $defaults = explode(',', get_config('moodle', 'mnetprofile' . $key . 'fields'));
 857     if ('1' === get_config('mnet', 'host' . $peer->id . $key . 'default')) {
 858         return array_merge($tmp['forced'], $defaults);
 859     }
 860     $hostsettings = get_config('mnet', 'host' . $peer->id . $key . 'fields');
 861     if (false === $hostsettings) {
 862         return array_merge($tmp['forced'], $defaults);
 863     }
 864     return array_merge($tmp['forced'], explode(',', $hostsettings));
 865 }
 866
 867
 868 /**
 869  * given a user object (or array) and a list of allowed fields,
 870  * strip out all the fields that should not be included.
 871  * This can be used both for outgoing data and incoming data.
 872  *
 873  * @param mixed $user array or object representing a database record
 874  * @param array $fields an array of allowed fields (usually from mnet_fields_to_{send,import}
 875  *
 876  * @return mixed array or object, depending what type of $user object was passed (datatype is respected)
 877  */
 878 function mnet_strip_user($user, $fields) {
 879     if (is_object($user)) {
 880         $user = (array)$user;
 881         $wasobject = true; // so we can cast back before we return
 882     }
 883
 884     foreach ($user as $key => $value) {
 885         if (!in_array($key, $fields)) {
 886             unset($user[$key]);
 887         }
 888     }
 889     if (!empty($wasobject)) {
 890         $user = (object)$user;
 891     }
 892     return $user;
 893 }