functions/smtp.php

   1 <?php
   2    /** smtp.php
   3     **
   4     ** This contains all the functions needed to send messages through
   5     ** an smtp server or sendmail.
   6     **
   7     ** $Id$
   8     **/
   9
  10    if (defined('smtp_php'))
  11       return;
  12    define('smtp_php', true);
  13
  14    include('../functions/addressbook.php');
  15    include('../functions/plugin.php');
  16
  17    global $username, $popuser, $domain;
  18
  19    // This should most probably go to some initialization...
  20    if (ereg("^([^@%/]+)[@%/](.+)$", $username, $usernamedata)) {
  21       $popuser = $usernamedata[1];
  22       $domain  = $usernamedata[2];
  23           unset($usernamedata);
  24    } else {
  25       $popuser = $username;
  26    }
  27    // We need domain for smtp
  28    if (!$domain)
  29       $domain = getenv('HOSTNAME');
  30
  31    // Returns true only if this message is multipart
  32    function isMultipart () {
  33       global $attachments;
  34
  35       if (count($attachments)>0)
  36          return true;
  37       else
  38          return false;
  39    }
  40
  41    // looks up aliases in the addressbook and expands them to
  42    // the full address.
  43    // Adds @$domain if it wasn't in the address book and if it
  44    // doesn't have an @ symbol in it
  45    function expandAddrs ($array) {
  46       global $domain;
  47
  48       // don't show errors -- kinda critical that we don't see
  49       // them here since the redirect won't work if we do show them
  50       $abook = addressbook_init(false);
  51       for ($i=0; $i < count($array); $i++) {
  52          $result = $abook->lookup($array[$i]);
  53          $ret = "";
  54          if (isset($result['email'])) {
  55             if (isset($result['name'])) {
  56                $ret = '"'.$result['name'].'" ';
  57             }
  58             $ret .= '<'.$result['email'].'>';
  59             $array[$i] = $ret;
  60          }
  61          else
  62          {
  63             if (strpos($array[$i], '@') === false)
  64                $array[$i] .= '@' . $domain;
  65             $array[$i] = '<' . $array[$i] . '>';
  66          }
  67       }
  68       return $array;
  69    }
  70
  71    // Attach the files that are due to be attached
  72    function attachFiles ($fp) {
  73       global $attachments, $attachment_dir;
  74
  75       $length = 0;
  76
  77       if (isMultipart()) {
  78          foreach ($attachments as $info)
  79          {
  80             if (isset($info['type']))
  81                $filetype = $info['type'];
  82             else
  83                $filetype = 'application/octet-stream';
  84
  85             $header = '--'.mimeBoundary()."\r\n";
  86             $header .= "Content-Type: $filetype; name=\"" .
  87                 $info['remotefilename'] . "\"\r\n";
  88             $header .= "Content-Disposition: attachment; filename=\"" .
  89                 $info['remotefilename'] . "\"\r\n";
  90
  91             // Use 'rb' for NT systems -- read binary
  92             // Unix doesn't care -- everything's binary!  :-)
  93             $file = fopen ($attachment_dir . $info['localfilename'], 'rb');
  94             if (substr($filetype, 0, 5) == 'text/' ||
  95                 $filetype == 'message/rfc822') {
  96                $header .= "\r\n";
  97                fputs ($fp, $header);
  98                $length += strlen($header);
  99                while ($tmp = fgets($file, 4096)) {
 100                   $tmp = str_replace("\r\n", "\n", $tmp);
 101                   $tmp = str_replace("\r", "\n", $tmp);
 102                   $tmp = str_replace("\n", "\r\n", $tmp);
 103                   if (feof($fp) && substr($tmp, -2) != "\r\n")
 104                      $tmp .= "\r\n";
 105                   fputs($fp, $tmp);
 106                   $length += strlen($tmp);
 107                }
 108             } else {
 109                $header .= "Content-Transfer-Encoding: base64\r\n\r\n";
 110                fputs ($fp, $header);
 111                $length += strlen($header);
 112                while ($tmp = fread($file, 570)) {
 113                   $encoded = chunk_split(base64_encode($tmp));
 114                   $length += strlen($encoded);
 115                   fputs ($fp, $encoded);
 116                }
 117             }
 118             fclose ($file);
 119          }
 120       }
 121
 122       return $length;
 123    }
 124
 125    // Delete files that are uploaded for attaching
 126    function deleteAttachments() {
 127       global $attachments, $attachment_dir;
 128
 129       if (isMultipart()) {
 130          reset($attachments);
 131          while (list($localname, $remotename) = each($attachments)) {
 132             if (!ereg ("\\/", $localname)) {
 133                unlink ($attachment_dir.$localname);
 134                unlink ($attachment_dir.$localname.'.info');
 135             }
 136          }
 137       }
 138    }
 139
 140    // Return a nice MIME-boundary
 141    function mimeBoundary () {
 142       static $mimeBoundaryString;
 143
 144       if ($mimeBoundaryString == "") {
 145          $mimeBoundaryString = "----=_" .
 146              GenerateRandomString(60, '\'()+,-./:=?_', 7);
 147       }
 148
 149       return $mimeBoundaryString;
 150    }
 151
 152    /* Time offset for correct timezone */
 153    function timezone () {
 154       global $invert_time;
 155
 156       $diff_second = date('Z');
 157       if ($invert_time)
 158           $diff_second = - $diff_second;
 159       if ($diff_second > 0)
 160          $sign = '+';
 161       else
 162          $sign = '-';
 163
 164       $diff_second = abs($diff_second);
 165
 166       $diff_hour = floor ($diff_second / 3600);
 167       $diff_minute = floor (($diff_second-3600*$diff_hour) / 60);
 168
 169       $zonename = '('.strftime('%Z').')';
 170       $result = sprintf ("%s%02d%02d %s", $sign, $diff_hour, $diff_minute, $zonename);
 171       return ($result);
 172    }
 173
 174    /* Print all the needed RFC822 headers */
 175    function write822Header ($fp, $t, $c, $b, $subject, $more_headers) {
 176       global $REMOTE_ADDR, $SERVER_NAME, $REMOTE_PORT;
 177       global $data_dir, $username, $popuser, $domain, $version, $useSendmail;
 178       global $default_charset, $HTTP_VIA, $HTTP_X_FORWARDED_FOR;
 179       global $REMOTE_HOST, $identity;
 180
 181       // Storing the header to make sure the header is the same
 182       // everytime the header is printed.
 183       static $header, $headerlength;
 184
 185       if ($header == '') {
 186          $to = expandAddrs(parseAddrs($t));
 187          $cc = expandAddrs(parseAddrs($c));
 188          $bcc = expandAddrs(parseAddrs($b));
 189          if (isset($identity) && $identity != 'default')
 190          {
 191             $reply_to = getPref($data_dir, $username, 'reply_to' . $identity);
 192             $from = getPref($data_dir, $username, 'full_name' . $identity);
 193             $from_addr = getPref($data_dir, $username, 'email_address' . $identity);
 194          }
 195          else
 196          {
 197             $reply_to = getPref($data_dir, $username, 'reply_to');
 198             $from = getPref($data_dir, $username, 'full_name');
 199             $from_addr = getPref($data_dir, $username, 'email_address');
 200          }
 201
 202          if ($from_addr == '')
 203             $from_addr = $popuser.'@'.$domain;
 204
 205          $to_list = getLineOfAddrs($to);
 206          $cc_list = getLineOfAddrs($cc);
 207          $bcc_list = getLineOfAddrs($bcc);
 208
 209          /* Encoding 8-bit characters and making from line */
 210          $subject = encodeHeader($subject);
 211          if ($from == '')
 212             $from = "<$from_addr>";
 213          else
 214             $from = '"' . encodeHeader($from) . "\" <$from_addr>";
 215
 216          /* This creates an RFC 822 date */
 217          $date = date("D, j M Y H:i:s ", mktime()) . timezone();
 218
 219          /* Create a message-id */
 220          $message_id = '<' . $REMOTE_PORT . '.' . $REMOTE_ADDR . '.';
 221          $message_id .= time() . '.squirrel@' . $SERVER_NAME .'>';
 222
 223          /* Make an RFC822 Received: line */
 224          if (isset($REMOTE_HOST))
 225             $received_from = "$REMOTE_HOST ([$REMOTE_ADDR])";
 226          else
 227             $received_from = $REMOTE_ADDR;
 228
 229          if (isset($HTTP_VIA) || isset ($HTTP_X_FORWARDED_FOR)) {
 230             if ($HTTP_X_FORWARDED_FOR == '')
 231                $HTTP_X_FORWARDED_FOR = 'unknown';
 232             $received_from .= " (proxying for $HTTP_X_FORWARDED_FOR)";
 233          }
 234
 235          $header  = "Received: from $received_from\r\n";
 236          $header .= "        (SquirrelMail authenticated user $username)\r\n";
 237          $header .= "        by $SERVER_NAME with HTTP;\r\n";
 238          $header .= "        $date\r\n";
 239
 240          /* Insert the rest of the header fields */
 241          $header .= "Message-ID: $message_id\r\n";
 242          $header .= "Date: $date\r\n";
 243          $header .= "Subject: $subject\r\n";
 244          $header .= "From: $from\r\n";
 245          $header .= "To: $to_list\r\n";    // Who it's TO
 246
 247          /* Insert headers from the $more_headers array */
 248          if(is_array($more_headers)) {
 249             reset($more_headers);
 250             while(list($h_name, $h_val) = each($more_headers)) {
 251                $header .= sprintf("%s: %s\r\n", $h_name, $h_val);
 252             }
 253          }
 254
 255          if ($cc_list) {
 256             $header .= "Cc: $cc_list\r\n"; // Who the CCs are
 257          }
 258
 259          if ($reply_to != '')
 260             $header .= "Reply-To: $reply_to\r\n";
 261
 262          if ($useSendmail) {
 263             if ($bcc_list) {
 264                // BCCs is removed from header by sendmail
 265                $header .= "Bcc: $bcc_list\r\n";
 266             }
 267          }
 268
 269          $header .= "X-Mailer: SquirrelMail (version $version)\r\n"; // Identify SquirrelMail
 270
 271          // Do the MIME-stuff
 272          $header .= "MIME-Version: 1.0\r\n";
 273
 274          if (isMultipart()) {
 275             $header .= 'Content-Type: multipart/mixed; boundary="';
 276             $header .= mimeBoundary();
 277             $header .= "\"\r\n";
 278          } else {
 279             if ($default_charset != '')
 280                $header .= "Content-Type: text/plain; charset=$default_charset\r\n";
 281             else
 282                $header .= "Content-Type: text/plain;\r\n";
 283             $header .= "Content-Transfer-Encoding: 8bit\r\n";
 284          }
 285          $header .= "\r\n"; // One blank line to separate header and body
 286
 287          $headerlength = strlen($header);
 288       }
 289
 290       // Write the header
 291       fputs ($fp, $header);
 292
 293       return $headerlength;
 294    }
 295
 296    // Send the body
 297    function writeBody ($fp, $passedBody) {
 298       global $default_charset;
 299
 300       $attachmentlength = 0;
 301
 302       if (isMultipart()) {
 303          $body = '--'.mimeBoundary()."\r\n";
 304
 305          if ($default_charset != "")
 306             $body .= "Content-Type: text/plain; charset=$default_charset\r\n";
 307          else
 308             $body .= "Content-Type: text/plain\r\n";
 309
 310          $body .= "Content-Transfer-Encoding: 8bit\r\n\r\n";
 311          $body .= $passedBody . "\r\n\r\n";
 312          fputs ($fp, $body);
 313
 314          $attachmentlength = attachFiles($fp);
 315
 316          if (!isset($postbody)) $postbody = "";
 317          $postbody .= "\r\n--".mimeBoundary()."--\r\n\r\n";
 318          fputs ($fp, $postbody);
 319       } else {
 320          $body = $passedBody . "\r\n";
 321          fputs ($fp, $body);
 322          $postbody = "\r\n";
 323          fputs ($fp, $postbody);
 324       }
 325
 326       return (strlen($body) + strlen($postbody) + $attachmentlength);
 327    }
 328
 329    // Send mail using the sendmail command
 330    function sendSendmail($t, $c, $b, $subject, $body, $more_headers) {
 331       global $sendmail_path, $popuser, $username, $domain;
 332
 333       // Build envelope sender address. Make sure it doesn't contain
 334       // spaces or other "weird" chars that would allow a user to
 335       // exploit the shell/pipe it is used in.
 336       $envelopefrom = "$popuser@$domain";
 337       $envelopefrom = ereg_replace("[[:blank:]]",'', $envelopefrom);
 338       $envelopefrom = ereg_replace("[[:space:]]",'', $envelopefrom);
 339       $envelopefrom = ereg_replace("[[:cntrl:]]",'', $envelopefrom);
 340
 341       // open pipe to sendmail
 342       $fp = popen (escapeshellcmd("$sendmail_path -t -f$envelopefrom"), 'w');
 343
 344       $headerlength = write822Header ($fp, $t, $c, $b, $subject, $more_headers);
 345       $bodylength = writeBody($fp, $body);
 346
 347       pclose($fp);
 348
 349       return ($headerlength + $bodylength);
 350    }
 351
 352    function smtpReadData($smtpConnection) {
 353       $read = fgets($smtpConnection, 1024);
 354       $counter = 0;
 355       while ($read) {
 356          echo $read . '<BR>';
 357          $data[$counter] = $read;
 358          $read = fgets($smtpConnection, 1024);
 359          $counter++;
 360       }
 361    }
 362
 363    function sendSMTP($t, $c, $b, $subject, $body, $more_headers) {
 364       global $username, $popuser, $domain, $version, $smtpServerAddress,
 365          $smtpPort, $data_dir, $color, $use_authenticated_smtp, $identity,
 366          $key, $onetimepad;
 367
 368       $to = expandAddrs(parseAddrs($t));
 369       $cc = expandAddrs(parseAddrs($c));
 370       $bcc = expandAddrs(parseAddrs($b));
 371       if (isset($identity) && $identity != 'default')
 372          $from_addr = getPref($data_dir, $username, 'email_address' . $identity);
 373       else
 374          $from_addr = getPref($data_dir, $username, 'email_address');
 375
 376       if (!$from_addr)
 377          $from_addr = "$popuser@$domain";
 378
 379       $smtpConnection = fsockopen($smtpServerAddress, $smtpPort, $errorNumber, $errorString);
 380       if (!$smtpConnection) {
 381          echo 'Error connecting to SMTP Server.<br>';
 382          echo "$errorNumber : $errorString<br>";
 383          exit;
 384       }
 385       $tmp = fgets($smtpConnection, 1024);
 386       if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 387
 388       $to_list = getLineOfAddrs($to);
 389       $cc_list = getLineOfAddrs($cc);
 390
 391       /** Lets introduce ourselves */
 392       if (! isset ($use_authenticated_smtp) || $use_authenticated_smtp == false) {
 393          fputs($smtpConnection, "HELO $domain\r\n");
 394          $tmp = fgets($smtpConnection, 1024);
 395       if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 396       } else {
 397          fputs($smtpConnection, "EHLO $domain\r\n");
 398          $tmp = fgets($smtpConnection, 1024);
 399          if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 400
 401          fputs($smtpConnection, "AUTH LOGIN\r\n");
 402          $tmp = fgets($smtpConnection, 1024);
 403          if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 404
 405          fputs($smtpConnection, base64_encode ($username) . "\r\n");
 406          $tmp = fgets($smtpConnection, 1024);
 407          if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 408
 409          fputs($smtpConnection, base64_encode (OneTimePadDecrypt($key, $onetimepad)) . "\r\n");
 410          $tmp = fgets($smtpConnection, 1024);
 411          if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 412       }
 413
 414       /** Ok, who is sending the message? */
 415       fputs($smtpConnection, "MAIL FROM: <$from_addr>\r\n");
 416       $tmp = fgets($smtpConnection, 1024);
 417       if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 418
 419       /** send who the recipients are */
 420       for ($i = 0; $i < count($to); $i++) {
 421          fputs($smtpConnection, "RCPT TO: $to[$i]\r\n");
 422          $tmp = fgets($smtpConnection, 1024);
 423          if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 424       }
 425       for ($i = 0; $i < count($cc); $i++) {
 426          fputs($smtpConnection, "RCPT TO: $cc[$i]\r\n");
 427          $tmp = fgets($smtpConnection, 1024);
 428          if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 429       }
 430       for ($i = 0; $i < count($bcc); $i++) {
 431          fputs($smtpConnection, "RCPT TO: $bcc[$i]\r\n");
 432          $tmp = fgets($smtpConnection, 1024);
 433          if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 434       }
 435
 436       /** Lets start sending the actual message */
 437       fputs($smtpConnection, "DATA\r\n");
 438       $tmp = fgets($smtpConnection, 1024);
 439       if (errorCheck($tmp, $smtpConnection)!=5) return(0);
 440
 441       // Send the message
 442       $headerlength = write822Header ($smtpConnection, $t, $c, $b, $subject, $more_headers);
 443       $bodylength = writeBody($smtpConnection, $body);
 444
 445       fputs($smtpConnection, ".\r\n"); // end the DATA part
 446       $tmp = fgets($smtpConnection, 1024);
 447       $num = errorCheck($tmp, $smtpConnection, true);
 448       if ($num != 250) {
 449          $tmp = nl2br(htmlspecialchars($tmp));
 450          displayPageHeader($color, 'None');
 451          include ("../functions/display_messages.php");
 452          $msg  = "Message not sent!<br>\nReason given: $tmp";
 453          plain_error_message($msg, $color);
 454          return(0);
 455       }
 456
 457       fputs($smtpConnection, "QUIT\r\n"); // log off
 458
 459       fclose($smtpConnection);
 460
 461       return ($headerlength + $bodylength);
 462    }
 463
 464
 465    function errorCheck($line, $smtpConnection, $verbose = false) {
 466       global $color;
 467
 468       // Read new lines on a multiline response
 469       $lines = $line;
 470       while(ereg("^[0-9]+-", $line)) {
 471          $line = fgets($smtpConnection, 1024);
 472          $lines .= $line;
 473       }
 474
 475       // Status:  0 = fatal
 476       //          5 = ok
 477
 478       $err_num = substr($line, 0, strpos($line, " "));
 479       switch ($err_num) {
 480          case 500:   $message = 'Syntax error; command not recognized';
 481                      $status = 0;
 482                      break;
 483          case 501:   $message = 'Syntax error in parameters or arguments';
 484                      $status = 0;
 485                      break;
 486          case 502:   $message = 'Command not implemented';
 487                      $status = 0;
 488                      break;
 489          case 503:   $message = 'Bad sequence of commands';
 490                      $status = 0;
 491                      break;
 492          case 504:   $message = 'Command parameter not implemented';
 493                      $status = 0;
 494                      break;
 495
 496
 497          case 211:   $message = 'System status, or system help reply';
 498                      $status = 5;
 499                      break;
 500          case 214:   $message = 'Help message';
 501                      $status = 5;
 502                      break;
 503
 504
 505          case 220:   $message = 'Service ready';
 506                      $status = 5;
 507                      break;
 508          case 221:   $message = 'Service closing transmission channel';
 509                      $status = 5;
 510                      break;
 511          case 421:   $message = 'Service not available, closing chanel';
 512                      $status = 0;
 513                      break;
 514
 515          case 235:   return(5); break;
 516          case 250:   $message = 'Requested mail action okay, completed';
 517                      $status = 5;
 518                      break;
 519          case 251:   $message = 'User not local; will forward';
 520                      $status = 5;
 521                      break;
 522          case 334:   return(5); break;
 523          case 450:   $message = 'Requested mail action not taken:  mailbox unavailable';
 524                      $status = 0;
 525                      break;
 526          case 550:   $message = 'Requested action not taken:  mailbox unavailable';
 527                      $status = 0;
 528                      break;
 529          case 451:   $message = 'Requested action aborted:  error in processing';
 530                      $status = 0;
 531                      break;
 532          case 551:   $message = 'User not local; please try forwarding';
 533                      $status = 0;
 534                      break;
 535          case 452:   $message = 'Requested action not taken:  insufficient system storage';
 536                      $status = 0;
 537                      break;
 538          case 552:   $message = 'Requested mail action aborted:  exceeding storage allocation';
 539                      $status = 0;
 540                      break;
 541          case 553:   $message = 'Requested action not taken: mailbox name not allowed';
 542                      $status = 0;
 543                      break;
 544          case 354:   $message = 'Start mail input; end with .';
 545                      $status = 5;
 546                      break;
 547          case 554:   $message = 'Transaction failed';
 548                      $status = 0;
 549                      break;
 550          default:    $message = 'Unknown response: '. nl2br(htmlspecialchars($lines));
 551                      $status = 0;
 552                      $error_num = '001';
 553                      break;
 554       }
 555
 556       if ($status == 0) {
 557          include '../functions/page_header.php';
 558          displayPageHeader($color, 'None');
 559                  include ("../functions/display_messages.php");
 560          $lines = nl2br(htmlspecialchars($lines));
 561                  $msg  = $message . "<br>\nServer replied: $lines";
 562                  plain_error_message($msg, $color);
 563       }
 564       if (! $verbose) return $status;
 565       return $err_num;
 566    }
 567
 568    function sendMessage($t, $c, $b, $subject, $body, $reply_id) {
 569       global $useSendmail, $msg_id, $is_reply, $mailbox, $onetimepad;
 570       global $data_dir, $username, $domain, $key, $version, $sent_folder, $imapServerAddress, $imapPort;
 571       global $more_headers;
 572       $more_headers = Array();
 573
 574       do_hook("smtp_send");
 575
 576       $imap_stream = sqimap_login($username, $key, $imapServerAddress, $imapPort, 1);
 577
 578       if (isset($reply_id) && $reply_id) {
 579          sqimap_mailbox_select ($imap_stream, $mailbox);
 580          sqimap_messages_flag ($imap_stream, $reply_id, $reply_id, 'Answered');
 581
 582          // Insert In-Reply-To and References headers if the
 583          // message-id of the message we reply to is set (longer than "<>")
 584          // The References header should really be the old Referenced header
 585          // with the message ID appended, but it can be only the message ID too.
 586          $hdr = sqimap_get_small_header ($imap_stream, $reply_id, false);
 587          if(strlen($hdr->message_id) > 2) {
 588             $more_headers['In-Reply-To'] = $hdr->message_id;
 589             $more_headers['References']  = $hdr->message_id;
 590          }
 591       }
 592
 593       // In order to remove the problem of users not able to create
 594       // messages with "." on a blank line, RFC821 has made provision
 595       // in section 4.5.2 (Transparency).
 596       $body = ereg_replace("\n\\.", "\n..", $body);
 597       $body = ereg_replace("^\\.", "..", $body);
 598
 599       // this is to catch all plain \n instances and
 600       // replace them with \r\n.  All newlines were converted
 601       // into just \n inside the compose.php file.
 602       $body = ereg_replace("\n", "\r\n", $body);
 603
 604       if ($useSendmail) {
 605          $length = sendSendmail($t, $c, $b, $subject, $body, $more_headers);
 606       } else {
 607          $length = sendSMTP($t, $c, $b, $subject, $body, $more_headers);
 608       }
 609
 610       if (sqimap_mailbox_exists ($imap_stream, $sent_folder)) {
 611          sqimap_append ($imap_stream, $sent_folder, $length);
 612          write822Header ($imap_stream, $t, $c, $b, $subject, $more_headers);
 613          writeBody ($imap_stream, $body);
 614          sqimap_append_done ($imap_stream);
 615       }
 616       sqimap_logout($imap_stream);
 617       // Delete the files uploaded for attaching (if any).
 618       // only if $length != 0 (if there was no error)
 619       if ($length)
 620          ClearAttachments();
 621
 622       return $length;
 623    }
 624
 625 ?>