class/deliver/Deliver_SMTP.class.php

   1 <?php
   2 /**
   3  * Deliver_SMTP.class.php
   4  *
   5  * Copyright (c) 1999-2003 The SquirrelMail Project Team
   6  * Licensed under the GNU GPL. For full terms see the file COPYING.
   7  *
   8  * Delivery backend for the Deliver class.
   9  *
  10  * $Id$
  11  */
  12
  13 require_once(SM_PATH . 'class/deliver/Deliver.class.php');
  14
  15 class Deliver_SMTP extends Deliver {
  16
  17     function preWriteToStream(&$s) {
  18        if ($s) {
  19           if ($s{0} == '.')   $s = '.' . $s;
  20           $s = str_replace("\n.","\n..",$s);
  21        }
  22     }
  23
  24     function initStream($message, $domain, $length=0, $host='', $port='', $user='', $pass='', $authpop=false) {
  25         global $use_smtp_tls,$smtp_auth_mech,$username,$key,$onetimepad;
  26
  27         if ($authpop) {
  28            $this->authPop($host, '', $username, $pass);
  29         }
  30
  31     $rfc822_header = $message->rfc822_header;
  32         $from = $rfc822_header->from[0];
  33         $to =   $rfc822_header->to;
  34         $cc =   $rfc822_header->cc;
  35         $bcc =  $rfc822_header->bcc;
  36
  37     if (($use_smtp_tls == true) and (check_php_version(4,3)) and (extension_loaded('openssl'))) {
  38           $stream = fsockopen('tls://' . $host, $port, $errorNumber, $errorString);
  39         } else {
  40           $stream = fsockopen($host, $port, $errorNumber, $errorString);
  41         }
  42
  43         if (!$stream) {
  44             $this->dlv_msg = $errorString;
  45             $this->dlv_ret_nr = $errorNumber;
  46             return(0);
  47         }
  48         $tmp = fgets($stream, 1024);
  49         if ($this->errorCheck($tmp, $stream)) {
  50             return(0);
  51         }
  52
  53         /* If $_SERVER['HTTP_HOST'] is set, use that in our HELO to the SMTP
  54            server.  This should fix the DNS issues some people have had */
  55         if (sqgetGlobalVar('HTTP_HOST', $HTTP_HOST, SQ_SERVER)) { // HTTP_HOST is set
  56                 $helohost = $HTTP_HOST;
  57         } else { // For some reason, HTTP_HOST is not set - revert to old behavior
  58                 $helohost = $domain;
  59         }
  60
  61         /* Lets introduce ourselves */
  62         if (( $smtp_auth_mech == 'cram-md5') or ( $smtp_auth_mech == 'digest-md5' )) {
  63           // Doing some form of non-plain auth
  64           fputs($stream, "EHLO $helohost\r\n");
  65           $tmp = fgets($stream,1024);
  66           if ($this->errorCheck($tmp,$stream)) {
  67             return(0);
  68           }
  69           if ($smtp_auth_mech == 'cram-md5') {
  70             fputs($stream, "AUTH CRAM-MD5\r\n");
  71           } elseif ($smtp_auth_mech == 'digest-md5') {
  72             fputs($stream, "AUTH DIGEST-MD5\r\n");
  73           }
  74           $tmp = fgets($stream,1024);
  75
  76           if ($this->errorCheck($tmp,$stream)) {
  77             return(0);
  78           }
  79
  80       // At this point, $tmp should hold "334 <challenge string>"
  81           $chall = substr($tmp,4);
  82           // Depending on mechanism, generate response string
  83           if ($smtp_auth_mech == 'cram-md5') {
  84             $response = cram_md5_response($username,$pass,$chall);
  85           } elseif ($smtp_auth_mech == 'digest-md5') {
  86             $response = digest_md5_response($username,$pass,$chall,'smtp',$host);
  87           }
  88           fputs($stream, $response);
  89
  90           // Let's see what the server had to say about that
  91           $tmp = fgets($stream,1024);
  92           if ($this->errorCheck($tmp,$stream)) {
  93             return(0);
  94           }
  95
  96           // CRAM-MD5 is done at this point.  If DIGEST-MD5, there's a bit more to go
  97           if ($smtp_auth_mech == 'digest-md5')
  98           {
  99             // $tmp contains rspauth, but I don't store that yet. (No need yet)
 100                 fputs($stream,"\r\n");
 101                 $tmp = fgets($stream,1024);
 102
 103                 if ($this->errorCheck($tmp,$stream)) {
 104                   return(0);
 105                 }
 106           }
 107     // CRAM-MD5 and DIGEST-MD5 code ends here
 108         } elseif ($smtp_auth_mech == 'none') {
 109           // No auth at all, just send helo and then send the mail
 110           fputs($stream, "HELO $helohost\r\n");
 111       $tmp = fgets($stream, 1024);
 112           if ($this->errorCheck($tmp, $stream)) {
 113         return(0);
 114           }
 115         } elseif ($smtp_auth_mech == 'login') {
 116           // The LOGIN method
 117       fputs($stream, "EHLO $helohost\r\n");
 118       $tmp = fgets($stream, 1024);
 119           if ($this->errorCheck($tmp, $stream)) {
 120         return(0);
 121           }
 122       fputs($stream, "AUTH LOGIN\r\n");
 123       $tmp = fgets($stream, 1024);
 124
 125           if ($this->errorCheck($tmp, $stream)) {
 126         return(0);
 127           }
 128       fputs($stream, base64_encode ($username) . "\r\n");
 129       $tmp = fgets($stream, 1024);
 130           if ($this->errorCheck($tmp, $stream)) {
 131         return(0);
 132           }
 133
 134       fputs($stream, base64_encode($pass) . "\r\n");
 135       $tmp = fgets($stream, 1024);
 136           if ($this->errorCheck($tmp, $stream)) {
 137         return(0);
 138           }
 139         } else {
 140                 /* Right here, they've reached an unsupported auth mechanism.
 141                    This is the ugliest hack I've ever done, but it'll do till I can fix
 142                    things up better tomorrow.  So tired... */
 143                 if ($this->errorCheck("535 Unable to use this auth type",$stream)) {
 144                         return(0);
 145                 }
 146     }
 147
 148         /* Ok, who is sending the message? */
 149         fputs($stream, 'MAIL FROM: <'.$from->mailbox.'@'.$from->host.">\r\n");
 150         $tmp = fgets($stream, 1024);
 151         if ($this->errorCheck($tmp, $stream)) {
 152             return(0);
 153         }
 154
 155         /* send who the recipients are */
 156         for ($i = 0, $cnt = count($to); $i < $cnt; $i++) {
 157             if (!$to[$i]->host) $to[$i]->host = $domain;
 158             if ($to[$i]->mailbox) {
 159                 fputs($stream, 'RCPT TO: <'.$to[$i]->mailbox.'@'.$to[$i]->host.">\r\n");
 160                 $tmp = fgets($stream, 1024);
 161                 if ($this->errorCheck($tmp, $stream)) {
 162                     return(0);
 163                 }
 164             }
 165         }
 166
 167         for ($i = 0, $cnt = count($cc); $i < $cnt; $i++) {
 168             if (!$cc[$i]->host) $cc[$i]->host = $domain;
 169             if ($cc[$i]->mailbox) {
 170                 fputs($stream, 'RCPT TO: <'.$cc[$i]->mailbox.'@'.$cc[$i]->host.">\r\n");
 171                 $tmp = fgets($stream, 1024);
 172                 if ($this->errorCheck($tmp, $stream)) {
 173                     return(0);
 174                 }
 175             }
 176         }
 177         for ($i = 0, $cnt = count($bcc); $i < $cnt; $i++) {
 178             if (!$bcc[$i]->host) $bcc[$i]->host = $domain;
 179             if ($bcc[$i]->mailbox) {
 180                 fputs($stream, 'RCPT TO: <'.$bcc[$i]->mailbox.'@'.$bcc[$i]->host.">\r\n");
 181                 $tmp = fgets($stream, 1024);
 182                 if ($this->errorCheck($tmp, $stream)) {
 183                     return(0);
 184                 }
 185             }
 186         }
 187         /* Lets start sending the actual message */
 188         fputs($stream, "DATA\r\n");
 189         $tmp = fgets($stream, 1024);
 190         if ($this->errorCheck($tmp, $stream)) {
 191             return(0);
 192         }
 193         return $stream;
 194     }
 195
 196     function finalizeStream($stream) {
 197         fputs($stream, ".\r\n"); /* end the DATA part */
 198         $tmp = fgets($stream, 1024);
 199         $this->errorCheck($tmp, $stream);
 200         if ($this->dlv_ret_nr != 250) {
 201             return(0);
 202         }
 203         fputs($stream, "QUIT\r\n"); /* log off */
 204         fclose($stream);
 205         return true;
 206     }
 207
 208     /* check if an SMTP reply is an error and set an error message) */
 209     function errorCheck($line, $smtpConnection) {
 210
 211         $err_num = substr($line, 0, 3);
 212         $this->dlv_ret_nr = $err_num;
 213         $server_msg = substr($line, 4);
 214
 215         while(substr($line, 0, 4) == ($err_num.'-')) {
 216             $line = fgets($smtpConnection, 1024);
 217             $server_msg .= substr($line, 4);
 218         }
 219
 220         if ( ((int) $err_num{0}) < 4)
 221         {
 222                 return false;
 223         }
 224
 225         switch ($err_num) {
 226         case '421': $message = _("Service not available, closing channel");
 227             break;
 228         case '432': $message = _("A password transition is needed");
 229             break;
 230         case '450': $message = _("Requested mail action not taken: mailbox unavailable");
 231             break;
 232         case '451': $message = _("Requested action aborted: error in processing");
 233             break;
 234         case '452': $message = _("Requested action not taken: insufficient system storage");
 235             break;
 236         case '454': $message = _("Temporary authentication failure");
 237             break;
 238         case '500': $message = _("Syntax error; command not recognized");
 239             break;
 240         case '501': $message = _("Syntax error in parameters or arguments");
 241             break;
 242         case '502': $message = _("Command not implemented");
 243             break;
 244         case '503': $message = _("Bad sequence of commands");
 245             break;
 246         case '504': $message = _("Command parameter not implemented");
 247             break;
 248         case '530': $message = _("Authentication required");
 249             break;
 250         case '534': $message = _("Authentication mechanism is too weak");
 251             break;
 252         case '535': $message = _("Authentication failed");
 253             break;
 254         case '538': $message = _("Encryption required for requested authentication mechanism");
 255             break;
 256         case '550': $message = _("Requested action not taken: mailbox unavailable");
 257             break;
 258         case '551': $message = _("User not local; please try forwarding");
 259             break;
 260         case '552': $message = _("Requested mail action aborted: exceeding storage allocation");
 261             break;
 262         case '553': $message = _("Requested action not taken: mailbox name not allowed");
 263             break;
 264         case '554': $message = _("Transaction failed");
 265             break;
 266         default:    $message = _("Unknown response");
 267             break;
 268         }
 269
 270         $this->dlv_msg = $message;
 271         $this->dlv_server_msg = nl2br(htmlspecialchars($server_msg));
 272
 273         return true;
 274     }
 275
 276     function authPop($pop_server='', $pop_port='', $user, $pass) {
 277         if (!$pop_port) {
 278             $pop_port = 110;
 279         }
 280         if (!$pop_server) {
 281             $pop_server = 'localhost';
 282         }
 283         $popConnection = fsockopen($pop_server, $pop_port, $err_no, $err_str);
 284         if (!$popConnection) {
 285             error_log("Error connecting to POP Server ($pop_server:$pop_port)"
 286                   . " $err_no : $err_str");
 287         } else {
 288             $tmp = fgets($popConnection, 1024); /* banner */
 289             if (!eregi("^\+OK", $tmp, $regs)) {
 290                 return(0);
 291             }
 292             fputs($popConnection, "USER $user\r\n");
 293             $tmp = fgets($popConnection, 1024);
 294             if (!eregi("^\+OK", $tmp, $regs)) {
 295                 return(0);
 296             }
 297             fputs($popConnection, 'PASS ' . $pass . "\r\n");
 298             $tmp = fgets($popConnection, 1024);
 299             if (!eregi("^\+OK", $tmp, $regs)) {
 300                 return(0);
 301             }
 302             fputs($popConnection, "QUIT\r\n"); /* log off */
 303             fclose($popConnection);
 304         }
 305     }
 306 }
 307
 308 ?>