X-Git-Url: https://vcs.fsf.org/?a=blobdiff_plain;f=class%2Fdeliver%2FDeliver_SMTP.class.php;h=e03c7682b3427ed6d83126142cd08c28c0db3e61;hb=335aac838df96dc73774aa319074deb2ace3a000;hp=44c7cfb6a1690b2068e42d2ada0536b6266fc345;hpb=e1ee60fe48638eb837be029cc2ed56a8bb849d3a;p=squirrelmail.git

diff --git a/class/deliver/Deliver_SMTP.class.php b/class/deliver/Deliver_SMTP.class.php
index 44c7cfb6..e03c7682 100644
--- a/class/deliver/Deliver_SMTP.class.php
+++ b/class/deliver/Deliver_SMTP.class.php
@@ -1,8 +1,516 @@
 <?php
 
-require_once('Deliver.class.php');
+/**
+ * Deliver_SMTP.class.php
+ *
+ * SMTP delivery backend for the Deliver class.
+ *
+ * @copyright &copy; 1999-2006 The SquirrelMail Project Team
+ * @license http://opensource.org/licenses/gpl-license.php GNU Public License
+ * @version $Id$
+ * @package squirrelmail
+ */
 
+/** @ignore */
+if (!defined('SM_PATH')) define('SM_PATH','../../');
+
+/** This of course depends upon Deliver */
+include_once(SM_PATH . 'class/deliver/Deliver.class.php');
+
+/**
+ * Deliver messages using SMTP
+ * @package squirrelmail
+ */
 class Deliver_SMTP extends Deliver {
+    /**
+     * Array keys are uppercased ehlo keywords
+     * array key values are ehlo params. If ehlo-param contains space, it is splitted into array. 
+     * @var array ehlo
+     * @since 1.5.1
+     */
+    var $ehlo = array();
+    /**
+     * @var string domain
+     * @since 1.5.1
+     */
+    var $domain = '';
+    /**
+     * SMTP STARTTLS rfc: "Both the client and the server MUST know if there 
+     * is a TLS session active."
+     * Variable should be set to true, when encryption is turned on.
+     * @var boolean
+     * @since 1.5.1 
+     */
+    var $tls_enabled = false;
+    /**
+     * Private var
+     * var stream $stream
+     * @todo don't pass stream resource in class method arguments.
+     */
+    //var $stream = false;
+    /** @var string delivery error message */
+    var $dlv_msg = '';
+    /** @var integer delivery error number from server */
+    var $dlv_ret_nr = '';
+    /** @var string delivery error message from server */
+    var $dlv_server_msg = '';
+
+    function preWriteToStream(&$s) {
+        if ($s) {
+            if ($s{0} == '.')   $s = '.' . $s;
+            $s = str_replace("\n.","\n..",$s);
+        }
+    }
+
+    function initStream($message, $domain, $length=0, $host='', $port='', $user='', $pass='', $authpop=false) {
+        global $use_smtp_tls,$smtp_auth_mech;
+
+        if ($authpop) {
+            $this->authPop($host, '', $user, $pass);
+        }
+
+        $rfc822_header = $message->rfc822_header;
+
+        $from = $rfc822_header->from[0];
+        $to =   $rfc822_header->to;
+        $cc =   $rfc822_header->cc;
+        $bcc =  $rfc822_header->bcc;
+        $content_type  = $rfc822_header->content_type;
+
+        // MAIL FROM: <from address> MUST be empty in cae of MDN (RFC2298)
+        if ($content_type->type0 == 'multipart' &&
+            $content_type->type1 == 'report' &&
+            isset($content_type->properties['report-type']) &&
+            $content_type->properties['report-type']=='disposition-notification') {
+            // reinitialize the from object because otherwise the from header somehow
+            // is affected. This $from var is used for smtp command MAIL FROM which
+            // is not the same as what we put in the rfc822 header.
+            $from = new AddressStructure();
+            $from->host = '';
+            $from->mailbox = '';
+        }
+
+        if ($use_smtp_tls == 1) {
+            if ((check_php_version(4,3)) && (extension_loaded('openssl'))) {
+                $stream = @fsockopen('tls://' . $host, $port, $errorNumber, $errorString);
+                $this->tls_enabled = true;
+            } else {
+                /**
+                 * don't connect to server when user asks for smtps and 
+                 * PHP does not support it.
+                 */
+                $errorNumber = '';
+                $errorString = _("Secure SMTP (TLS) is enabled in SquirrelMail configuration, but used PHP version does not support it.");
+            }
+        } else {
+            $stream = @fsockopen($host, $port, $errorNumber, $errorString);
+        }
+
+        if (!$stream) {
+            // reset tls state var to default value, if connection fails
+            $this->tls_enabled = false;
+            // set error messages
+            $this->dlv_msg = $errorString;
+            $this->dlv_ret_nr = $errorNumber;
+            $this->dlv_server_msg = _("Can't open SMTP stream.");
+            return(0);
+        }
+        // get server greeting
+        $tmp = fgets($stream, 1024);
+        if ($this->errorCheck($tmp, $stream)) {
+            return(0);
+        }
+
+        /*
+         * If $_SERVER['HTTP_HOST'] is set, use that in our HELO to the SMTP
+         * server.  This should fix the DNS issues some people have had
+         */
+        if (sqgetGlobalVar('HTTP_HOST', $HTTP_HOST, SQ_SERVER)) { // HTTP_HOST is set
+            // optionally trim off port number
+            if($p = strrpos($HTTP_HOST, ':')) {
+                $HTTP_HOST = substr($HTTP_HOST, 0, $p);
+            }
+            $helohost = $HTTP_HOST;
+        } else { // For some reason, HTTP_HOST is not set - revert to old behavior
+            $helohost = $domain;
+        }
+
+        /* Lets introduce ourselves */
+        fputs($stream, "EHLO $helohost\r\n");
+        // Read ehlo response
+        $tmp = $this->parse_ehlo_response($stream);
+        if ($this->errorCheck($tmp,$stream)) {
+            // fall back to HELO if EHLO is not supported (error 5xx)
+            if ($this->dlv_ret_nr{0} == '5') {
+                fputs($stream, "HELO $helohost\r\n");
+                $tmp = fgets($stream,1024);
+                if ($this->errorCheck($tmp,$stream)) {
+                    return(0);
+                }
+            } else {
+                return(0);
+            }
+        }
+
+        /**
+         * Implementing SMTP STARTTLS (rfc2487) in php 5.1.0+
+         * http://www.php.net/stream-socket-enable-crypto
+         */
+        if ($use_smtp_tls === 2) {
+            if (function_exists('stream_socket_enable_crypto')) {
+                // don't try starting tls, when client thinks that it is already active
+                if ($this->tls_enabled) {
+                    $this->dlv_msg = _("TLS session is already activated.");
+                    return 0;
+                } elseif (!array_key_exists('STARTTLS',$this->ehlo)) {
+                    // check for starttls in ehlo response
+                    $this->dlv_msg = _("SMTP STARTTLS is enabled in SquirrelMail configuration, but used SMTP server does not support it");
+                    return 0;
+                }
+
+                // issue starttls command
+                fputs($stream, "STARTTLS\r\n");
+                // get response
+                $tmp = fgets($stream,1024);
+                if ($this->errorCheck($tmp,$stream)) {
+                    return 0;
+                }
+
+                // start crypto on connection. suppress function errors.
+                if (@stream_socket_enable_crypto($stream,true,STREAM_CRYPTO_METHOD_TLS_CLIENT)) {
+                    // starttls was successful (rfc2487 5.2 Result of the STARTTLS Command)
+                    // get new EHLO response
+                    fputs($stream, "EHLO $helohost\r\n");
+                    // Read ehlo response
+                    $tmp = $this->parse_ehlo_response($stream);
+                    if ($this->errorCheck($tmp,$stream)) {
+                        // don't revert to helo here. server must support ESMTP
+                        return 0;
+                    }
+                    // set information about started tls
+                    $this->tls_enabled = true;
+                } else {
+                    /**
+                     * stream_socket_enable_crypto() call failed.
+                     */
+                    $this->dlv_msg = _("Unable to start TLS.");
+                    return 0;
+                    // Bug: can't get error message. See comments in sqimap_create_stream().
+                }
+            } else {
+                // php install does not support stream_socket_enable_crypto() function
+                $this->dlv_msg = _("SMTP STARTTLS is enabled in SquirrelMail configuration, but used PHP version does not support functions that allow to enable encryption on open socket.");
+                return 0;
+            }
+        }
+
+        // FIXME: check ehlo response before using authentication
+        if (( $smtp_auth_mech == 'cram-md5') or ( $smtp_auth_mech == 'digest-md5' )) {
+            // Doing some form of non-plain auth
+            if ($smtp_auth_mech == 'cram-md5') {
+                fputs($stream, "AUTH CRAM-MD5\r\n");
+            } elseif ($smtp_auth_mech == 'digest-md5') {
+                fputs($stream, "AUTH DIGEST-MD5\r\n");
+            }
+
+            $tmp = fgets($stream,1024);
+
+            if ($this->errorCheck($tmp,$stream)) {
+                return(0);
+            }
+
+            // At this point, $tmp should hold "334 <challenge string>"
+            $chall = substr($tmp,4);
+            // Depending on mechanism, generate response string
+            if ($smtp_auth_mech == 'cram-md5') {
+                $response = cram_md5_response($user,$pass,$chall);
+            } elseif ($smtp_auth_mech == 'digest-md5') {
+                $response = digest_md5_response($user,$pass,$chall,'smtp',$host);
+            }
+            fputs($stream, $response);
+
+            // Let's see what the server had to say about that
+            $tmp = fgets($stream,1024);
+            if ($this->errorCheck($tmp,$stream)) {
+                return(0);
+            }
+
+            // CRAM-MD5 is done at this point.  If DIGEST-MD5, there's a bit more to go
+            if ($smtp_auth_mech == 'digest-md5') {
+                // $tmp contains rspauth, but I don't store that yet. (No need yet)
+                fputs($stream,"\r\n");
+                $tmp = fgets($stream,1024);
+
+                if ($this->errorCheck($tmp,$stream)) {
+                return(0);
+                }
+            }
+        // CRAM-MD5 and DIGEST-MD5 code ends here
+        } elseif ($smtp_auth_mech == 'none') {
+        // No auth at all, just send helo and then send the mail
+        // We already said hi earlier, nothing more is needed.
+        } elseif ($smtp_auth_mech == 'login') {
+            // The LOGIN method
+            fputs($stream, "AUTH LOGIN\r\n");
+            $tmp = fgets($stream, 1024);
+
+            if ($this->errorCheck($tmp, $stream)) {
+                return(0);
+            }
+            fputs($stream, base64_encode ($user) . "\r\n");
+            $tmp = fgets($stream, 1024);
+            if ($this->errorCheck($tmp, $stream)) {
+                return(0);
+            }
+
+            fputs($stream, base64_encode($pass) . "\r\n");
+            $tmp = fgets($stream, 1024);
+            if ($this->errorCheck($tmp, $stream)) {
+                return(0);
+            }
+        } elseif ($smtp_auth_mech == "plain") {
+            /* SASL Plain */
+            $auth = base64_encode("$user\0$user\0$pass");
+
+            $query = "AUTH PLAIN\r\n";
+            fputs($stream, $query);
+            $read=fgets($stream, 1024);
+
+            if (substr($read,0,3) == '334') { // OK so far..
+                fputs($stream, "$auth\r\n");
+                $read = fgets($stream, 1024);
+            }
+
+            $results=explode(" ",$read,3);
+            $response=$results[1];
+            $message=$results[2];
+        } else {
+            /* Right here, they've reached an unsupported auth mechanism.
+            This is the ugliest hack I've ever done, but it'll do till I can fix
+            things up better tomorrow.  So tired... */
+            if ($this->errorCheck("535 Unable to use this auth type",$stream)) {
+                return(0);
+            }
+        }
+
+        /* Ok, who is sending the message? */
+        $fromaddress = ($from->mailbox && $from->host) ?
+            $from->mailbox.'@'.$from->host : '';
+        fputs($stream, 'MAIL FROM:<'.$fromaddress.">\r\n");
+        $tmp = fgets($stream, 1024);
+        if ($this->errorCheck($tmp, $stream)) {
+            return(0);
+        }
+
+        /* send who the recipients are */
+        for ($i = 0, $cnt = count($to); $i < $cnt; $i++) {
+            if (!$to[$i]->host) $to[$i]->host = $domain;
+            if ($to[$i]->mailbox) {
+                fputs($stream, 'RCPT TO:<'.$to[$i]->mailbox.'@'.$to[$i]->host.">\r\n");
+                $tmp = fgets($stream, 1024);
+                if ($this->errorCheck($tmp, $stream)) {
+                    return(0);
+                }
+            }
+        }
+
+        for ($i = 0, $cnt = count($cc); $i < $cnt; $i++) {
+            if (!$cc[$i]->host) $cc[$i]->host = $domain;
+            if ($cc[$i]->mailbox) {
+                fputs($stream, 'RCPT TO:<'.$cc[$i]->mailbox.'@'.$cc[$i]->host.">\r\n");
+                $tmp = fgets($stream, 1024);
+                if ($this->errorCheck($tmp, $stream)) {
+                    return(0);
+                }
+            }
+        }
+
+        for ($i = 0, $cnt = count($bcc); $i < $cnt; $i++) {
+            if (!$bcc[$i]->host) $bcc[$i]->host = $domain;
+            if ($bcc[$i]->mailbox) {
+                fputs($stream, 'RCPT TO:<'.$bcc[$i]->mailbox.'@'.$bcc[$i]->host.">\r\n");
+                $tmp = fgets($stream, 1024);
+                if ($this->errorCheck($tmp, $stream)) {
+                    return(0);
+                }
+            }
+        }
+        /* Lets start sending the actual message */
+        fputs($stream, "DATA\r\n");
+        $tmp = fgets($stream, 1024);
+        if ($this->errorCheck($tmp, $stream)) {
+                return(0);
+        }
+        return $stream;
+    }
+
+    function finalizeStream($stream) {
+        fputs($stream, "\r\n.\r\n"); /* end the DATA part */
+        $tmp = fgets($stream, 1024);
+        $this->errorCheck($tmp, $stream);
+        if ($this->dlv_ret_nr != 250) {
+                return(0);
+        }
+        fputs($stream, "QUIT\r\n"); /* log off */
+        fclose($stream);
+        return true;
+    }
+
+    /* check if an SMTP reply is an error and set an error message) */
+    function errorCheck($line, $smtpConnection) {
+
+        $err_num = substr($line, 0, 3);
+        $this->dlv_ret_nr = $err_num;
+        $server_msg = substr($line, 4);
+
+        while(substr($line, 0, 4) == ($err_num.'-')) {
+            $line = fgets($smtpConnection, 1024);
+            $server_msg .= substr($line, 4);
+        }
+
+        if ( ((int) $err_num{0}) < 4) {
+            return false;
+        }
+
+        switch ($err_num) {
+        case '421': $message = _("Service not available, closing channel");
+            break;
+        case '432': $message = _("A password transition is needed");
+            break;
+        case '450': $message = _("Requested mail action not taken: mailbox unavailable");
+            break;
+        case '451': $message = _("Requested action aborted: error in processing");
+            break;
+        case '452': $message = _("Requested action not taken: insufficient system storage");
+            break;
+        case '454': $message = _("Temporary authentication failure");
+            break;
+        case '500': $message = _("Syntax error; command not recognized");
+            break;
+        case '501': $message = _("Syntax error in parameters or arguments");
+            break;
+        case '502': $message = _("Command not implemented");
+            break;
+        case '503': $message = _("Bad sequence of commands");
+            break;
+        case '504': $message = _("Command parameter not implemented");
+            break;
+        case '530': $message = _("Authentication required");
+            break;
+        case '534': $message = _("Authentication mechanism is too weak");
+            break;
+        case '535': $message = _("Authentication failed");
+            break;
+        case '538': $message = _("Encryption required for requested authentication mechanism");
+            break;
+        case '550': $message = _("Requested action not taken: mailbox unavailable");
+            break;
+        case '551': $message = _("User not local; please try forwarding");
+            break;
+        case '552': $message = _("Requested mail action aborted: exceeding storage allocation");
+            break;
+        case '553': $message = _("Requested action not taken: mailbox name not allowed");
+            break;
+        case '554': $message = _("Transaction failed");
+            break;
+        default:    $message = _("Unknown response");
+            break;
+        }
+
+        $this->dlv_msg = $message;
+        $this->dlv_server_msg = $server_msg;
+
+        return true;
+    }
+
+    function authPop($pop_server='', $pop_port='', $user, $pass) {
+        if (!$pop_port) {
+            $pop_port = 110;
+        }
+        if (!$pop_server) {
+            $pop_server = 'localhost';
+        }
+        $popConnection = fsockopen($pop_server, $pop_port, $err_no, $err_str);
+        if (!$popConnection) {
+            error_log("Error connecting to POP Server ($pop_server:$pop_port)"
+                . " $err_no : $err_str");
+        } else {
+            $tmp = fgets($popConnection, 1024); /* banner */
+            if (substr($tmp, 0, 3) != '+OK') {
+                return(0);
+            }
+            fputs($popConnection, "USER $user\r\n");
+            $tmp = fgets($popConnection, 1024);
+            if (substr($tmp, 0, 3) != '+OK') {
+                return(0);
+            }
+            fputs($popConnection, 'PASS ' . $pass . "\r\n");
+            $tmp = fgets($popConnection, 1024);
+            if (substr($tmp, 0, 3) != '+OK') {
+                return(0);
+            }
+            fputs($popConnection, "QUIT\r\n"); /* log off */
+            fclose($popConnection);
+        }
+    }
 
+    /**
+     * Parses ESMTP EHLO response (rfc1869)
+     *
+     * Reads SMTP response to EHLO command and fills class variables 
+     * (ehlo array and domain string). Returns last line.
+     * @param stream $stream smtp connection stream.
+     * @return string last ehlo line
+     * @since 1.5.1
+     */
+    function parse_ehlo_response($stream) {
+        // don't cache ehlo information
+        $this->ehlo=array();
+        $ret = '';
+        $firstline = true;
+        /**
+         * ehlo mailclient.example.org
+         * 250-mail.example.org
+         * 250-PIPELINING
+         * 250-SIZE 52428800
+         * 250-DATAZ
+         * 250-STARTTLS
+         * 250-AUTH LOGIN PLAIN
+         * 250 8BITMIME
+         */
+        while ($line=fgets($stream, 1024)){
+            // match[1] = first symbol after 250
+            // match[2] = domain or ehlo-keyword
+            // match[3] = greeting or ehlo-param
+            // match space after keyword in ehlo-keyword CR LF
+            if (preg_match("/^250(-|\s)(\S*)\s+(\S.*)\r\n/",$line,$match)||
+                preg_match("/^250(-|\s)(\S*)\s*\r\n/",$line,$match)) {
+                if ($firstline) {
+                    // first ehlo line (250[-\ ]domain SP greeting)
+                    $this->domain = $match[2];
+                    $firstline=false;
+                } elseif (!isset($match[3])) {
+                    // simple one word extension
+                    $this->ehlo[strtoupper($match[2])]='';
+                } elseif (!preg_match("/\s/",trim($match[3]))) {
+                    // extension with one option
+                    // yes, I know about ctype extension. no, i don't want to depend on it
+                    $this->ehlo[strtoupper($match[2])]=trim($match[3]);
+                } else {
+                    // ehlo-param with spaces
+                    $this->ehlo[strtoupper($match[2])]=explode(' ',trim($match[3]));
+                }
+                if ($match[1]==' ') {
+                    // stop while cycle, if we reach last 250 line
+                    $ret = $line;
+                    break;
+                }
+            } else {
+                // this is not 250 response
+                $ret = $line;
+                break;
+            }
+        }
+        return $ret;
+    }
 }
-?>