class/deliver/Deliver_SMTP.class.php

   1 <?php
   2 /**
   3  * Deliver_SMTP.class.php
   4  *
   5  * Copyright (c) 1999-2004 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  * @package squirrelmail
  12  */
  13
  14 /** This of course depends upon Deliver */
  15 require_once(SM_PATH . 'class/deliver/Deliver.class.php');
  16
  17 /**
  18  * Deliver messages using SMTP
  19  * @package squirrelmail
  20  */
  21 class Deliver_SMTP extends Deliver {
  22
  23     function preWriteToStream(&$s) {
  24        if ($s) {
  25           if ($s{0} == '.')   $s = '.' . $s;
  26           $s = str_replace("\n.","\n..",$s);
  27        }
  28     }
  29
  30     function initStream($message, $domain, $length=0, $host='', $port='', $user='', $pass='', $authpop=false) {
  31         global $use_smtp_tls,$smtp_auth_mech;
  32
  33         if ($authpop) {
  34            $this->authPop($host, '', $user, $pass);
  35         }
  36
  37     $rfc822_header = $message->rfc822_header;
  38         $from = $rfc822_header->from[0];
  39         $to =   $rfc822_header->to;
  40         $cc =   $rfc822_header->cc;
  41         $bcc =  $rfc822_header->bcc;
  42
  43     if (($use_smtp_tls == true) and (check_php_version(4,3)) and (extension_loaded('openssl'))) {
  44           $stream = fsockopen('tls://' . $host, $port, $errorNumber, $errorString);
  45         } else {
  46           $stream = fsockopen($host, $port, $errorNumber, $errorString);
  47         }
  48
  49         if (!$stream) {
  50             $this->dlv_msg = $errorString;
  51             $this->dlv_ret_nr = $errorNumber;
  52             return(0);
  53         }
  54         $tmp = fgets($stream, 1024);
  55         if ($this->errorCheck($tmp, $stream)) {
  56             return(0);
  57         }
  58
  59         /*
  60      * If $_SERVER['HTTP_HOST'] is set, use that in our HELO to the SMTP
  61          * server.  This should fix the DNS issues some people have had
  62      */
  63         if (sqgetGlobalVar('HTTP_HOST', $HTTP_HOST, SQ_SERVER)) { // HTTP_HOST is set
  64         // optionally trim off port number
  65         if($p = strrpos($HTTP_HOST, ':')) {
  66             $HTTP_HOST = substr($HTTP_HOST, 0, $p);
  67         }
  68                 $helohost = $HTTP_HOST;
  69         } else { // For some reason, HTTP_HOST is not set - revert to old behavior
  70                 $helohost = $domain;
  71         }
  72
  73         /* Lets introduce ourselves */
  74     fputs($stream, "EHLO $helohost\r\n");
  75     $tmp = fgets($stream,1024);
  76     if ($this->errorCheck($tmp,$stream)) {
  77         return(0);
  78     }
  79
  80         if (( $smtp_auth_mech == 'cram-md5') or ( $smtp_auth_mech == 'digest-md5' )) {
  81           // Doing some form of non-plain auth
  82           if ($smtp_auth_mech == 'cram-md5') {
  83             fputs($stream, "AUTH CRAM-MD5\r\n");
  84           } elseif ($smtp_auth_mech == 'digest-md5') {
  85             fputs($stream, "AUTH DIGEST-MD5\r\n");
  86           }
  87
  88           $tmp = fgets($stream,1024);
  89
  90           if ($this->errorCheck($tmp,$stream)) {
  91             return(0);
  92           }
  93
  94       // At this point, $tmp should hold "334 <challenge string>"
  95           $chall = substr($tmp,4);
  96           // Depending on mechanism, generate response string
  97           if ($smtp_auth_mech == 'cram-md5') {
  98             $response = cram_md5_response($user,$pass,$chall);
  99           } elseif ($smtp_auth_mech == 'digest-md5') {
 100             $response = digest_md5_response($user,$pass,$chall,'smtp',$host);
 101           }
 102           fputs($stream, $response);
 103
 104           // Let's see what the server had to say about that
 105           $tmp = fgets($stream,1024);
 106           if ($this->errorCheck($tmp,$stream)) {
 107             return(0);
 108           }
 109
 110           // CRAM-MD5 is done at this point.  If DIGEST-MD5, there's a bit more to go
 111           if ($smtp_auth_mech == 'digest-md5')
 112           {
 113             // $tmp contains rspauth, but I don't store that yet. (No need yet)
 114                 fputs($stream,"\r\n");
 115                 $tmp = fgets($stream,1024);
 116
 117                 if ($this->errorCheck($tmp,$stream)) {
 118                   return(0);
 119                 }
 120           }
 121     // CRAM-MD5 and DIGEST-MD5 code ends here
 122         } elseif ($smtp_auth_mech == 'none') {
 123           // No auth at all, just send helo and then send the mail
 124       // We already said hi earlier, nothing more is needed.
 125         } elseif ($smtp_auth_mech == 'login') {
 126           // The LOGIN method
 127       fputs($stream, "AUTH LOGIN\r\n");
 128       $tmp = fgets($stream, 1024);
 129
 130           if ($this->errorCheck($tmp, $stream)) {
 131         return(0);
 132           }
 133       fputs($stream, base64_encode ($user) . "\r\n");
 134       $tmp = fgets($stream, 1024);
 135           if ($this->errorCheck($tmp, $stream)) {
 136         return(0);
 137           }
 138
 139       fputs($stream, base64_encode($pass) . "\r\n");
 140       $tmp = fgets($stream, 1024);
 141           if ($this->errorCheck($tmp, $stream)) {
 142         return(0);
 143           }
 144         } elseif ($smtp_auth_mech == "plain") {
 145       /* SASL Plain */
 146       $auth = base64_encode("$user\0$user\0$pass");
 147
 148       $query = "AUTH PLAIN\r\n";
 149       fputs($stream, $query);
 150       $read=fgets($stream, 1024);
 151
 152       if (substr($read,0,3) == '334') { // OK so far..
 153          fputs($stream, "$auth\r\n");
 154          $read = fgets($stream, 1024);
 155       }
 156
 157       $results=explode(" ",$read,3);
 158       $response=$results[1];
 159       $message=$results[2];
 160
 161
 162     } else {
 163                 /* Right here, they've reached an unsupported auth mechanism.
 164                    This is the ugliest hack I've ever done, but it'll do till I can fix
 165                    things up better tomorrow.  So tired... */
 166                 if ($this->errorCheck("535 Unable to use this auth type",$stream)) {
 167                         return(0);
 168                 }
 169     }
 170
 171         /* Ok, who is sending the message? */
 172         fputs($stream, 'MAIL FROM:<'.$from->mailbox.'@'.$from->host.">\r\n");
 173         $tmp = fgets($stream, 1024);
 174         if ($this->errorCheck($tmp, $stream)) {
 175             return(0);
 176         }
 177
 178         /* send who the recipients are */
 179         for ($i = 0, $cnt = count($to); $i < $cnt; $i++) {
 180             if (!$to[$i]->host) $to[$i]->host = $domain;
 181             if ($to[$i]->mailbox) {
 182                 fputs($stream, 'RCPT TO:<'.$to[$i]->mailbox.'@'.$to[$i]->host.">\r\n");
 183                 $tmp = fgets($stream, 1024);
 184                 if ($this->errorCheck($tmp, $stream)) {
 185                     return(0);
 186                 }
 187             }
 188         }
 189
 190         for ($i = 0, $cnt = count($cc); $i < $cnt; $i++) {
 191             if (!$cc[$i]->host) $cc[$i]->host = $domain;
 192             if ($cc[$i]->mailbox) {
 193                 fputs($stream, 'RCPT TO:<'.$cc[$i]->mailbox.'@'.$cc[$i]->host.">\r\n");
 194                 $tmp = fgets($stream, 1024);
 195                 if ($this->errorCheck($tmp, $stream)) {
 196                     return(0);
 197                 }
 198             }
 199         }
 200
 201         for ($i = 0, $cnt = count($bcc); $i < $cnt; $i++) {
 202             if (!$bcc[$i]->host) $bcc[$i]->host = $domain;
 203             if ($bcc[$i]->mailbox) {
 204                 fputs($stream, 'RCPT TO:<'.$bcc[$i]->mailbox.'@'.$bcc[$i]->host.">\r\n");
 205                 $tmp = fgets($stream, 1024);
 206                 if ($this->errorCheck($tmp, $stream)) {
 207                     return(0);
 208                 }
 209             }
 210         }
 211         /* Lets start sending the actual message */
 212         fputs($stream, "DATA\r\n");
 213         $tmp = fgets($stream, 1024);
 214         if ($this->errorCheck($tmp, $stream)) {
 215             return(0);
 216         }
 217         return $stream;
 218     }
 219
 220     function finalizeStream($stream) {
 221         fputs($stream, ".\r\n"); /* end the DATA part */
 222         $tmp = fgets($stream, 1024);
 223         $this->errorCheck($tmp, $stream);
 224         if ($this->dlv_ret_nr != 250) {
 225             return(0);
 226         }
 227         fputs($stream, "QUIT\r\n"); /* log off */
 228         fclose($stream);
 229         return true;
 230     }
 231
 232     /* check if an SMTP reply is an error and set an error message) */
 233     function errorCheck($line, $smtpConnection) {
 234
 235         $err_num = substr($line, 0, 3);
 236         $this->dlv_ret_nr = $err_num;
 237         $server_msg = substr($line, 4);
 238
 239         while(substr($line, 0, 4) == ($err_num.'-')) {
 240             $line = fgets($smtpConnection, 1024);
 241             $server_msg .= substr($line, 4);
 242         }
 243
 244         if ( ((int) $err_num{0}) < 4)
 245         {
 246                 return false;
 247         }
 248
 249         switch ($err_num) {
 250         case '421': $message = _("Service not available, closing channel");
 251             break;
 252         case '432': $message = _("A password transition is needed");
 253             break;
 254         case '450': $message = _("Requested mail action not taken: mailbox unavailable");
 255             break;
 256         case '451': $message = _("Requested action aborted: error in processing");
 257             break;
 258         case '452': $message = _("Requested action not taken: insufficient system storage");
 259             break;
 260         case '454': $message = _("Temporary authentication failure");
 261             break;
 262         case '500': $message = _("Syntax error; command not recognized");
 263             break;
 264         case '501': $message = _("Syntax error in parameters or arguments");
 265             break;
 266         case '502': $message = _("Command not implemented");
 267             break;
 268         case '503': $message = _("Bad sequence of commands");
 269             break;
 270         case '504': $message = _("Command parameter not implemented");
 271             break;
 272         case '530': $message = _("Authentication required");
 273             break;
 274         case '534': $message = _("Authentication mechanism is too weak");
 275             break;
 276         case '535': $message = _("Authentication failed");
 277             break;
 278         case '538': $message = _("Encryption required for requested authentication mechanism");
 279             break;
 280         case '550': $message = _("Requested action not taken: mailbox unavailable");
 281             break;
 282         case '551': $message = _("User not local; please try forwarding");
 283             break;
 284         case '552': $message = _("Requested mail action aborted: exceeding storage allocation");
 285             break;
 286         case '553': $message = _("Requested action not taken: mailbox name not allowed");
 287             break;
 288         case '554': $message = _("Transaction failed");
 289             break;
 290         default:    $message = _("Unknown response");
 291             break;
 292         }
 293
 294         $this->dlv_msg = $message;
 295         $this->dlv_server_msg = nl2br(htmlspecialchars($server_msg));
 296
 297         return true;
 298     }
 299
 300     function authPop($pop_server='', $pop_port='', $user, $pass) {
 301         if (!$pop_port) {
 302             $pop_port = 110;
 303         }
 304         if (!$pop_server) {
 305             $pop_server = 'localhost';
 306         }
 307         $popConnection = fsockopen($pop_server, $pop_port, $err_no, $err_str);
 308         if (!$popConnection) {
 309             error_log("Error connecting to POP Server ($pop_server:$pop_port)"
 310                   . " $err_no : $err_str");
 311         } else {
 312             $tmp = fgets($popConnection, 1024); /* banner */
 313             if (substr($tmp, 0, 3) != '+OK') {
 314                 return(0);
 315             }
 316             fputs($popConnection, "USER $user\r\n");
 317             $tmp = fgets($popConnection, 1024);
 318             if (substr($tmp, 0, 3) != '+OK') {
 319                 return(0);
 320             }
 321             fputs($popConnection, 'PASS ' . $pass . "\r\n");
 322             $tmp = fgets($popConnection, 1024);
 323             if (substr($tmp, 0, 3) != '+OK') {
 324                 return(0);
 325             }
 326             fputs($popConnection, "QUIT\r\n"); /* log off */
 327             fclose($popConnection);
 328         }
 329     }
 330 }
 331
 332 ?>