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1 | <?php |
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2 | |
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3 | /** |
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4 | * Deliver_SMTP.class.php |
5 | * |
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6 | * SMTP delivery backend for the Deliver class. |
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7 | * |
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8 | * @copyright © 1999-2009 The SquirrelMail Project Team |
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9 | * @license http://opensource.org/licenses/gpl-license.php GNU Public License |
10 | * @version $Id$ |
11 | * @package squirrelmail |
12 | */ |
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13 | |
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14 | /** @ignore */ |
15 | if (!defined('SM_PATH')) define('SM_PATH','../../'); |
16 | |
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17 | /** This of course depends upon Deliver */ |
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18 | include_once(SM_PATH . 'class/deliver/Deliver.class.php'); |
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19 | |
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20 | /** |
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21 | * Deliver messages using SMTP |
22 | * @package squirrelmail |
23 | */ |
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24 | class Deliver_SMTP extends Deliver { |
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25 | /** |
26 | * Array keys are uppercased ehlo keywords |
27 | * array key values are ehlo params. If ehlo-param contains space, it is splitted into array. |
28 | * @var array ehlo |
29 | * @since 1.5.1 |
30 | */ |
31 | var $ehlo = array(); |
32 | /** |
33 | * @var string domain |
34 | * @since 1.5.1 |
35 | */ |
36 | var $domain = ''; |
37 | /** |
38 | * SMTP STARTTLS rfc: "Both the client and the server MUST know if there |
39 | * is a TLS session active." |
40 | * Variable should be set to true, when encryption is turned on. |
41 | * @var boolean |
42 | * @since 1.5.1 |
43 | */ |
44 | var $tls_enabled = false; |
45 | /** |
46 | * Private var |
47 | * var stream $stream |
48 | * @todo don't pass stream resource in class method arguments. |
49 | */ |
50 | //var $stream = false; |
51 | /** @var string delivery error message */ |
52 | var $dlv_msg = ''; |
53 | /** @var integer delivery error number from server */ |
54 | var $dlv_ret_nr = ''; |
55 | /** @var string delivery error message from server */ |
56 | var $dlv_server_msg = ''; |
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57 | |
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58 | function preWriteToStream(&$s) { |
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59 | if ($s) { |
60 | if ($s{0} == '.') $s = '.' . $s; |
61 | $s = str_replace("\n.","\n..",$s); |
62 | } |
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63 | } |
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64 | |
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65 | function initStream($message, $domain, $length=0, $host='', $port='', $user='', $pass='', $authpop=false, $pop_host='') { |
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66 | global $use_smtp_tls,$smtp_auth_mech; |
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67 | |
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68 | if ($authpop) { |
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69 | $this->authPop($pop_host, '', $user, $pass); |
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70 | } |
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71 | |
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72 | $rfc822_header = $message->rfc822_header; |
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73 | |
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74 | $from = $rfc822_header->from[0]; |
75 | $to = $rfc822_header->to; |
76 | $cc = $rfc822_header->cc; |
77 | $bcc = $rfc822_header->bcc; |
78 | $content_type = $rfc822_header->content_type; |
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79 | |
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80 | // MAIL FROM: <from address> MUST be empty in cae of MDN (RFC2298) |
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81 | if ($content_type->type0 == 'multipart' && |
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82 | $content_type->type1 == 'report' && |
83 | isset($content_type->properties['report-type']) && |
84 | $content_type->properties['report-type']=='disposition-notification') { |
93ae5eaf |
85 | // reinitialize the from object because otherwise the from header somehow |
86 | // is affected. This $from var is used for smtp command MAIL FROM which |
87 | // is not the same as what we put in the rfc822 header. |
88 | $from = new AddressStructure(); |
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89 | $from->host = ''; |
90 | $from->mailbox = ''; |
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91 | } |
92 | |
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93 | if ($use_smtp_tls == 1) { |
94 | if ((check_php_version(4,3)) && (extension_loaded('openssl'))) { |
95 | $stream = @fsockopen('tls://' . $host, $port, $errorNumber, $errorString); |
96 | $this->tls_enabled = true; |
97 | } else { |
98 | /** |
99 | * don't connect to server when user asks for smtps and |
100 | * PHP does not support it. |
101 | */ |
102 | $errorNumber = ''; |
103 | $errorString = _("Secure SMTP (TLS) is enabled in SquirrelMail configuration, but used PHP version does not support it."); |
104 | } |
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105 | } else { |
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106 | $stream = @fsockopen($host, $port, $errorNumber, $errorString); |
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107 | } |
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108 | |
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109 | if (!$stream) { |
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110 | // reset tls state var to default value, if connection fails |
111 | $this->tls_enabled = false; |
112 | // set error messages |
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113 | $this->dlv_msg = $errorString; |
114 | $this->dlv_ret_nr = $errorNumber; |
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115 | $this->dlv_server_msg = _("Can't open SMTP stream."); |
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116 | return(0); |
117 | } |
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118 | // get server greeting |
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119 | $tmp = fgets($stream, 1024); |
120 | if ($this->errorCheck($tmp, $stream)) { |
121 | return(0); |
122 | } |
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123 | |
124 | /* |
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125 | * If $_SERVER['HTTP_HOST'] is set, use that in our HELO to the SMTP |
126 | * server. This should fix the DNS issues some people have had |
127 | */ |
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128 | if (sqgetGlobalVar('HTTP_HOST', $HTTP_HOST, SQ_SERVER)) { // HTTP_HOST is set |
129 | // optionally trim off port number |
130 | if($p = strrpos($HTTP_HOST, ':')) { |
131 | $HTTP_HOST = substr($HTTP_HOST, 0, $p); |
132 | } |
133 | $helohost = $HTTP_HOST; |
134 | } else { // For some reason, HTTP_HOST is not set - revert to old behavior |
135 | $helohost = $domain; |
136 | } |
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137 | |
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138 | // if the host is an IPv4 address, enclose it in brackets |
139 | // |
870ffc40 |
140 | if (preg_match('/^\d+\.\d+\.\d+\.\d+$/', $helohost)) |
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141 | $helohost = '[' . $helohost . ']'; |
142 | |
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143 | /* Lets introduce ourselves */ |
144 | fputs($stream, "EHLO $helohost\r\n"); |
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145 | // Read ehlo response |
146 | $tmp = $this->parse_ehlo_response($stream); |
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147 | if ($this->errorCheck($tmp,$stream)) { |
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148 | // fall back to HELO if EHLO is not supported (error 5xx) |
149 | if ($this->dlv_ret_nr{0} == '5') { |
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150 | fputs($stream, "HELO $helohost\r\n"); |
151 | $tmp = fgets($stream,1024); |
152 | if ($this->errorCheck($tmp,$stream)) { |
153 | return(0); |
154 | } |
155 | } else { |
156 | return(0); |
157 | } |
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158 | } |
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159 | |
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160 | /** |
161 | * Implementing SMTP STARTTLS (rfc2487) in php 5.1.0+ |
162 | * http://www.php.net/stream-socket-enable-crypto |
163 | */ |
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164 | if ($use_smtp_tls === 2) { |
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165 | if (function_exists('stream_socket_enable_crypto')) { |
166 | // don't try starting tls, when client thinks that it is already active |
167 | if ($this->tls_enabled) { |
168 | $this->dlv_msg = _("TLS session is already activated."); |
169 | return 0; |
170 | } elseif (!array_key_exists('STARTTLS',$this->ehlo)) { |
171 | // check for starttls in ehlo response |
172 | $this->dlv_msg = _("SMTP STARTTLS is enabled in SquirrelMail configuration, but used SMTP server does not support it"); |
173 | return 0; |
174 | } |
175 | |
176 | // issue starttls command |
177 | fputs($stream, "STARTTLS\r\n"); |
178 | // get response |
179 | $tmp = fgets($stream,1024); |
180 | if ($this->errorCheck($tmp,$stream)) { |
181 | return 0; |
182 | } |
183 | |
184 | // start crypto on connection. suppress function errors. |
185 | if (@stream_socket_enable_crypto($stream,true,STREAM_CRYPTO_METHOD_TLS_CLIENT)) { |
186 | // starttls was successful (rfc2487 5.2 Result of the STARTTLS Command) |
187 | // get new EHLO response |
188 | fputs($stream, "EHLO $helohost\r\n"); |
189 | // Read ehlo response |
190 | $tmp = $this->parse_ehlo_response($stream); |
191 | if ($this->errorCheck($tmp,$stream)) { |
192 | // don't revert to helo here. server must support ESMTP |
193 | return 0; |
194 | } |
195 | // set information about started tls |
196 | $this->tls_enabled = true; |
197 | } else { |
198 | /** |
199 | * stream_socket_enable_crypto() call failed. |
200 | */ |
201 | $this->dlv_msg = _("Unable to start TLS."); |
202 | return 0; |
203 | // Bug: can't get error message. See comments in sqimap_create_stream(). |
204 | } |
205 | } else { |
206 | // php install does not support stream_socket_enable_crypto() function |
207 | $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."); |
208 | return 0; |
209 | } |
210 | } |
211 | |
212 | // FIXME: check ehlo response before using authentication |
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213 | if (( $smtp_auth_mech == 'cram-md5') or ( $smtp_auth_mech == 'digest-md5' )) { |
214 | // Doing some form of non-plain auth |
215 | if ($smtp_auth_mech == 'cram-md5') { |
216 | fputs($stream, "AUTH CRAM-MD5\r\n"); |
217 | } elseif ($smtp_auth_mech == 'digest-md5') { |
218 | fputs($stream, "AUTH DIGEST-MD5\r\n"); |
219 | } |
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220 | |
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221 | $tmp = fgets($stream,1024); |
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222 | |
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223 | if ($this->errorCheck($tmp,$stream)) { |
224 | return(0); |
225 | } |
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226 | |
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227 | // At this point, $tmp should hold "334 <challenge string>" |
228 | $chall = substr($tmp,4); |
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229 | // Depending on mechanism, generate response string |
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230 | if ($smtp_auth_mech == 'cram-md5') { |
231 | $response = cram_md5_response($user,$pass,$chall); |
232 | } elseif ($smtp_auth_mech == 'digest-md5') { |
233 | $response = digest_md5_response($user,$pass,$chall,'smtp',$host); |
234 | } |
235 | fputs($stream, $response); |
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236 | |
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237 | // Let's see what the server had to say about that |
238 | $tmp = fgets($stream,1024); |
239 | if ($this->errorCheck($tmp,$stream)) { |
240 | return(0); |
241 | } |
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242 | |
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243 | // CRAM-MD5 is done at this point. If DIGEST-MD5, there's a bit more to go |
244 | if ($smtp_auth_mech == 'digest-md5') { |
245 | // $tmp contains rspauth, but I don't store that yet. (No need yet) |
246 | fputs($stream,"\r\n"); |
247 | $tmp = fgets($stream,1024); |
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248 | |
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249 | if ($this->errorCheck($tmp,$stream)) { |
250 | return(0); |
251 | } |
252 | } |
253 | // CRAM-MD5 and DIGEST-MD5 code ends here |
254 | } elseif ($smtp_auth_mech == 'none') { |
255 | // No auth at all, just send helo and then send the mail |
256 | // We already said hi earlier, nothing more is needed. |
257 | } elseif ($smtp_auth_mech == 'login') { |
258 | // The LOGIN method |
259 | fputs($stream, "AUTH LOGIN\r\n"); |
260 | $tmp = fgets($stream, 1024); |
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261 | |
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262 | if ($this->errorCheck($tmp, $stream)) { |
263 | return(0); |
264 | } |
265 | fputs($stream, base64_encode ($user) . "\r\n"); |
266 | $tmp = fgets($stream, 1024); |
267 | if ($this->errorCheck($tmp, $stream)) { |
268 | return(0); |
269 | } |
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270 | |
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271 | fputs($stream, base64_encode($pass) . "\r\n"); |
272 | $tmp = fgets($stream, 1024); |
273 | if ($this->errorCheck($tmp, $stream)) { |
274 | return(0); |
275 | } |
276 | } elseif ($smtp_auth_mech == "plain") { |
277 | /* SASL Plain */ |
278 | $auth = base64_encode("$user\0$user\0$pass"); |
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279 | |
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280 | $query = "AUTH PLAIN\r\n"; |
281 | fputs($stream, $query); |
282 | $read=fgets($stream, 1024); |
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283 | |
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284 | if (substr($read,0,3) == '334') { // OK so far.. |
285 | fputs($stream, "$auth\r\n"); |
286 | $read = fgets($stream, 1024); |
287 | } |
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288 | |
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289 | $results=explode(" ",$read,3); |
290 | $response=$results[1]; |
291 | $message=$results[2]; |
292 | } else { |
293 | /* Right here, they've reached an unsupported auth mechanism. |
294 | This is the ugliest hack I've ever done, but it'll do till I can fix |
295 | things up better tomorrow. So tired... */ |
296 | if ($this->errorCheck("535 Unable to use this auth type",$stream)) { |
297 | return(0); |
298 | } |
299 | } |
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300 | |
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301 | /* Ok, who is sending the message? */ |
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302 | $fromaddress = (strlen($from->mailbox) && $from->host) ? |
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303 | $from->mailbox.'@'.$from->host : ''; |
304 | fputs($stream, 'MAIL FROM:<'.$fromaddress.">\r\n"); |
305 | $tmp = fgets($stream, 1024); |
306 | if ($this->errorCheck($tmp, $stream)) { |
307 | return(0); |
308 | } |
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309 | |
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310 | /* send who the recipients are */ |
311 | for ($i = 0, $cnt = count($to); $i < $cnt; $i++) { |
312 | if (!$to[$i]->host) $to[$i]->host = $domain; |
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313 | if (strlen($to[$i]->mailbox)) { |
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314 | fputs($stream, 'RCPT TO:<'.$to[$i]->mailbox.'@'.$to[$i]->host.">\r\n"); |
315 | $tmp = fgets($stream, 1024); |
316 | if ($this->errorCheck($tmp, $stream)) { |
317 | return(0); |
318 | } |
319 | } |
320 | } |
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321 | |
322 | for ($i = 0, $cnt = count($cc); $i < $cnt; $i++) { |
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323 | if (!$cc[$i]->host) $cc[$i]->host = $domain; |
7d38dfae |
324 | if (strlen($cc[$i]->mailbox)) { |
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325 | fputs($stream, 'RCPT TO:<'.$cc[$i]->mailbox.'@'.$cc[$i]->host.">\r\n"); |
326 | $tmp = fgets($stream, 1024); |
327 | if ($this->errorCheck($tmp, $stream)) { |
328 | return(0); |
329 | } |
330 | } |
331 | } |
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332 | |
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333 | for ($i = 0, $cnt = count($bcc); $i < $cnt; $i++) { |
334 | if (!$bcc[$i]->host) $bcc[$i]->host = $domain; |
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335 | if (strlen($bcc[$i]->mailbox)) { |
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336 | fputs($stream, 'RCPT TO:<'.$bcc[$i]->mailbox.'@'.$bcc[$i]->host.">\r\n"); |
337 | $tmp = fgets($stream, 1024); |
338 | if ($this->errorCheck($tmp, $stream)) { |
339 | return(0); |
340 | } |
341 | } |
342 | } |
343 | /* Lets start sending the actual message */ |
344 | fputs($stream, "DATA\r\n"); |
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345 | $tmp = fgets($stream, 1024); |
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346 | if ($this->errorCheck($tmp, $stream)) { |
347 | return(0); |
5fe73b9f |
348 | } |
eeb17be5 |
349 | return $stream; |
5fe73b9f |
350 | } |
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351 | |
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352 | function finalizeStream($stream) { |
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353 | fputs($stream, "\r\n.\r\n"); /* end the DATA part */ |
354 | $tmp = fgets($stream, 1024); |
355 | $this->errorCheck($tmp, $stream); |
356 | if ($this->dlv_ret_nr != 250) { |
357 | return(0); |
358 | } |
359 | fputs($stream, "QUIT\r\n"); /* log off */ |
360 | fclose($stream); |
361 | return true; |
5fe73b9f |
362 | } |
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363 | |
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364 | /* check if an SMTP reply is an error and set an error message) */ |
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365 | function errorCheck($line, $smtpConnection) { |
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366 | |
367 | $err_num = substr($line, 0, 3); |
368 | $this->dlv_ret_nr = $err_num; |
369 | $server_msg = substr($line, 4); |
370 | |
371 | while(substr($line, 0, 4) == ($err_num.'-')) { |
372 | $line = fgets($smtpConnection, 1024); |
373 | $server_msg .= substr($line, 4); |
374 | } |
375 | |
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376 | if ( ((int) $err_num{0}) < 4) { |
377 | return false; |
ca71b2db |
378 | } |
379 | |
380 | switch ($err_num) { |
381 | case '421': $message = _("Service not available, closing channel"); |
382 | break; |
383 | case '432': $message = _("A password transition is needed"); |
384 | break; |
385 | case '450': $message = _("Requested mail action not taken: mailbox unavailable"); |
386 | break; |
387 | case '451': $message = _("Requested action aborted: error in processing"); |
388 | break; |
389 | case '452': $message = _("Requested action not taken: insufficient system storage"); |
390 | break; |
391 | case '454': $message = _("Temporary authentication failure"); |
392 | break; |
393 | case '500': $message = _("Syntax error; command not recognized"); |
394 | break; |
395 | case '501': $message = _("Syntax error in parameters or arguments"); |
396 | break; |
397 | case '502': $message = _("Command not implemented"); |
398 | break; |
399 | case '503': $message = _("Bad sequence of commands"); |
400 | break; |
401 | case '504': $message = _("Command parameter not implemented"); |
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402 | break; |
ca71b2db |
403 | case '530': $message = _("Authentication required"); |
404 | break; |
405 | case '534': $message = _("Authentication mechanism is too weak"); |
406 | break; |
407 | case '535': $message = _("Authentication failed"); |
408 | break; |
409 | case '538': $message = _("Encryption required for requested authentication mechanism"); |
410 | break; |
411 | case '550': $message = _("Requested action not taken: mailbox unavailable"); |
412 | break; |
413 | case '551': $message = _("User not local; please try forwarding"); |
414 | break; |
415 | case '552': $message = _("Requested mail action aborted: exceeding storage allocation"); |
416 | break; |
417 | case '553': $message = _("Requested action not taken: mailbox name not allowed"); |
418 | break; |
419 | case '554': $message = _("Transaction failed"); |
420 | break; |
421 | default: $message = _("Unknown response"); |
422 | break; |
423 | } |
424 | |
425 | $this->dlv_msg = $message; |
a15f9d93 |
426 | $this->dlv_server_msg = $server_msg; |
ca71b2db |
427 | |
5fe73b9f |
428 | return true; |
429 | } |
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430 | |
5fe73b9f |
431 | function authPop($pop_server='', $pop_port='', $user, $pass) { |
432 | if (!$pop_port) { |
433 | $pop_port = 110; |
434 | } |
435 | if (!$pop_server) { |
436 | $pop_server = 'localhost'; |
437 | } |
85d3e98c |
438 | $popConnection = @fsockopen($pop_server, $pop_port, $err_no, $err_str); |
5fe73b9f |
439 | if (!$popConnection) { |
440 | error_log("Error connecting to POP Server ($pop_server:$pop_port)" |
eeb17be5 |
441 | . " $err_no : $err_str"); |
85d3e98c |
442 | return false; |
5fe73b9f |
443 | } else { |
444 | $tmp = fgets($popConnection, 1024); /* banner */ |
22bd1baf |
445 | if (substr($tmp, 0, 3) != '+OK') { |
85d3e98c |
446 | return false; |
5fe73b9f |
447 | } |
448 | fputs($popConnection, "USER $user\r\n"); |
449 | $tmp = fgets($popConnection, 1024); |
22bd1baf |
450 | if (substr($tmp, 0, 3) != '+OK') { |
85d3e98c |
451 | return false; |
5fe73b9f |
452 | } |
453 | fputs($popConnection, 'PASS ' . $pass . "\r\n"); |
454 | $tmp = fgets($popConnection, 1024); |
22bd1baf |
455 | if (substr($tmp, 0, 3) != '+OK') { |
85d3e98c |
456 | return false; |
5fe73b9f |
457 | } |
458 | fputs($popConnection, "QUIT\r\n"); /* log off */ |
459 | fclose($popConnection); |
460 | } |
85d3e98c |
461 | return true; |
5fe73b9f |
462 | } |
a15f9d93 |
463 | |
464 | /** |
465 | * Parses ESMTP EHLO response (rfc1869) |
466 | * |
467 | * Reads SMTP response to EHLO command and fills class variables |
468 | * (ehlo array and domain string). Returns last line. |
469 | * @param stream $stream smtp connection stream. |
470 | * @return string last ehlo line |
471 | * @since 1.5.1 |
472 | */ |
473 | function parse_ehlo_response($stream) { |
474 | // don't cache ehlo information |
475 | $this->ehlo=array(); |
476 | $ret = ''; |
477 | $firstline = true; |
478 | /** |
479 | * ehlo mailclient.example.org |
480 | * 250-mail.example.org |
481 | * 250-PIPELINING |
482 | * 250-SIZE 52428800 |
483 | * 250-DATAZ |
484 | * 250-STARTTLS |
485 | * 250-AUTH LOGIN PLAIN |
486 | * 250 8BITMIME |
487 | */ |
488 | while ($line=fgets($stream, 1024)){ |
489 | // match[1] = first symbol after 250 |
490 | // match[2] = domain or ehlo-keyword |
491 | // match[3] = greeting or ehlo-param |
492 | // match space after keyword in ehlo-keyword CR LF |
493 | if (preg_match("/^250(-|\s)(\S*)\s+(\S.*)\r\n/",$line,$match)|| |
494 | preg_match("/^250(-|\s)(\S*)\s*\r\n/",$line,$match)) { |
495 | if ($firstline) { |
496 | // first ehlo line (250[-\ ]domain SP greeting) |
497 | $this->domain = $match[2]; |
498 | $firstline=false; |
499 | } elseif (!isset($match[3])) { |
500 | // simple one word extension |
501 | $this->ehlo[strtoupper($match[2])]=''; |
502 | } elseif (!preg_match("/\s/",trim($match[3]))) { |
503 | // extension with one option |
504 | // yes, I know about ctype extension. no, i don't want to depend on it |
505 | $this->ehlo[strtoupper($match[2])]=trim($match[3]); |
506 | } else { |
507 | // ehlo-param with spaces |
508 | $this->ehlo[strtoupper($match[2])]=explode(' ',trim($match[3])); |
509 | } |
510 | if ($match[1]==' ') { |
511 | // stop while cycle, if we reach last 250 line |
512 | $ret = $line; |
513 | break; |
514 | } |
515 | } else { |
516 | // this is not 250 response |
517 | $ret = $line; |
518 | break; |
519 | } |
520 | } |
521 | return $ret; |
522 | } |
e1ee60fe |
523 | } |