2 * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
3 * Copyright (C) 1999-2007 Hiroyuki Yamamoto and the Claws Mail team
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
26 #include <glib/gi18n.h>
40 static void smtp_session_destroy(Session *session);
42 static gint smtp_auth(SMTPSession *session);
43 #if (defined(USE_OPENSSL) || defined (USE_GNUTLS))
44 static gint smtp_starttls(SMTPSession *session);
46 static gint smtp_auth_cram_md5(SMTPSession *session);
47 static gint smtp_auth_login(SMTPSession *session);
48 static gint smtp_auth_plain(SMTPSession *session);
50 static gint smtp_ehlo(SMTPSession *session);
51 static gint smtp_ehlo_recv(SMTPSession *session, const gchar *msg);
53 static gint smtp_helo(SMTPSession *session);
54 static gint smtp_rcpt(SMTPSession *session);
55 static gint smtp_data(SMTPSession *session);
56 static gint smtp_send_data(SMTPSession *session);
57 static gint smtp_make_ready(SMTPSession *session);
58 static gint smtp_eom(SMTPSession *session);
60 static gint smtp_session_recv_msg(Session *session, const gchar *msg);
61 static gint smtp_session_send_data_finished(Session *session, guint len);
64 Session *smtp_session_new(void *prefs_account)
68 session = g_new0(SMTPSession, 1);
70 session_init(SESSION(session), prefs_account, TRUE);
72 SESSION(session)->type = SESSION_SMTP;
74 SESSION(session)->recv_msg = smtp_session_recv_msg;
76 SESSION(session)->recv_data_finished = NULL;
77 SESSION(session)->send_data_finished = smtp_session_send_data_finished;
79 SESSION(session)->destroy = smtp_session_destroy;
81 session->state = SMTP_READY;
83 #if (defined(USE_OPENSSL) || defined (USE_GNUTLS))
84 session->tls_init_done = FALSE;
87 session->hostname = NULL;
92 session->to_list = NULL;
93 session->cur_to = NULL;
95 session->send_data = NULL;
96 session->send_data_len = 0;
98 session->max_message_size = -1;
100 session->avail_auth_type = 0;
101 session->forced_auth_type = 0;
102 session->auth_type = 0;
103 session->esmtp_flags = 0;
105 session->error_val = SM_OK;
106 session->error_msg = NULL;
108 return SESSION(session);
111 static void smtp_session_destroy(Session *session)
113 SMTPSession *smtp_session = SMTP_SESSION(session);
115 g_free(smtp_session->hostname);
116 g_free(smtp_session->user);
117 g_free(smtp_session->pass);
118 g_free(smtp_session->from);
120 g_free(smtp_session->send_data);
122 g_free(smtp_session->error_msg);
125 gint smtp_from(SMTPSession *session)
127 gchar buf[MSGBUFSIZE];
128 gchar *mail_size = NULL;
130 g_return_val_if_fail(session->from != NULL, SM_ERROR);
132 session->state = SMTP_FROM;
134 if (session->is_esmtp && (session->esmtp_flags & ESMTP_SIZE)!=0)
135 mail_size = g_strdup_printf(" SIZE=%d", session->send_data_len);
137 mail_size = g_strdup("");
140 if (strchr(session->from, '<'))
141 g_snprintf(buf, sizeof(buf), "MAIL FROM:%s%s", session->from,
144 g_snprintf(buf, sizeof(buf), "MAIL FROM:<%s>%s", session->from,
149 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf) < 0)
151 log_print(LOG_PROTOCOL, "%sSMTP> %s\n", (session->is_esmtp?"E":""), buf);
156 static gint smtp_auth(SMTPSession *session)
159 g_return_val_if_fail(session->user != NULL, SM_ERROR);
161 session->state = SMTP_AUTH;
163 if (session->forced_auth_type == SMTPAUTH_CRAM_MD5 ||
164 (session->forced_auth_type == 0 &&
165 (session->avail_auth_type & SMTPAUTH_CRAM_MD5) != 0))
166 smtp_auth_cram_md5(session);
167 else if (session->forced_auth_type == SMTPAUTH_LOGIN ||
168 (session->forced_auth_type == 0 &&
169 (session->avail_auth_type & SMTPAUTH_LOGIN) != 0))
170 smtp_auth_login(session);
171 else if (session->forced_auth_type == SMTPAUTH_PLAIN ||
172 (session->forced_auth_type == 0 &&
173 (session->avail_auth_type & SMTPAUTH_PLAIN) != 0))
174 smtp_auth_plain(session);
176 log_warning(LOG_PROTOCOL, _("SMTP AUTH not available\n"));
183 static gint smtp_auth_recv(SMTPSession *session, const gchar *msg)
185 gchar buf[MSGBUFSIZE];
187 switch (session->auth_type) {
189 session->state = SMTP_AUTH_LOGIN_USER;
191 if (!strncmp(msg, "334 ", 4)) {
192 base64_encode(buf, session->user, strlen(session->user));
194 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL,
197 log_print(LOG_PROTOCOL, "ESMTP> [USERID]\n");
199 /* Server rejects AUTH */
200 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL,
203 log_print(LOG_PROTOCOL, "ESMTP> *\n");
206 case SMTPAUTH_CRAM_MD5:
207 session->state = SMTP_AUTH_CRAM_MD5;
209 if (!strncmp(msg, "334 ", 4)) {
214 guchar hexdigest[33];
216 challenge = g_malloc(strlen(msg + 4) + 1);
217 challengelen = base64_decode(challenge, msg + 4, -1);
218 challenge[challengelen] = '\0';
219 log_print(LOG_PROTOCOL, "ESMTP< [Decoded: %s]\n", challenge);
221 g_snprintf(buf, sizeof(buf), "%s", session->pass);
222 md5_hex_hmac(hexdigest, challenge, challengelen,
223 buf, strlen(session->pass));
226 response = g_strdup_printf
227 ("%s %s", session->user, hexdigest);
228 log_print(LOG_PROTOCOL, "ESMTP> [Encoded: %s]\n", response);
230 response64 = g_malloc((strlen(response) + 3) * 2 + 1);
231 base64_encode(response64, response, strlen(response));
234 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL,
237 log_print(LOG_PROTOCOL, "ESMTP> %s\n", response64);
240 /* Server rejects AUTH */
241 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL,
244 log_print(LOG_PROTOCOL, "ESMTP> *\n");
247 case SMTPAUTH_DIGEST_MD5:
249 /* stop smtp_auth when no correct authtype */
250 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "*") < 0)
252 log_print(LOG_PROTOCOL, "ESMTP> *\n");
259 static gint smtp_auth_login_user_recv(SMTPSession *session, const gchar *msg)
261 gchar buf[MSGBUFSIZE];
263 session->state = SMTP_AUTH_LOGIN_PASS;
265 if (!strncmp(msg, "334 ", 4))
266 base64_encode(buf, session->pass, strlen(session->pass));
268 /* Server rejects AUTH */
269 g_snprintf(buf, sizeof(buf), "*");
271 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf) < 0)
274 log_print(LOG_PROTOCOL, "ESMTP> [PASSWORD]\n");
279 static gint smtp_ehlo(SMTPSession *session)
281 gchar buf[MSGBUFSIZE];
283 session->state = SMTP_EHLO;
285 session->avail_auth_type = 0;
287 g_snprintf(buf, sizeof(buf), "EHLO %s",
288 session->hostname ? session->hostname : get_domain_name());
289 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf) < 0)
291 log_print(LOG_PROTOCOL, "ESMTP> %s\n", buf);
296 static gint smtp_ehlo_recv(SMTPSession *session, const gchar *msg)
298 if (strncmp(msg, "250", 3) == 0) {
299 const gchar *p = msg;
301 if (*p == '-' || *p == ' ') p++;
302 if (g_ascii_strncasecmp(p, "AUTH", 4) == 0) {
304 if (strcasestr(p, "PLAIN"))
305 session->avail_auth_type |= SMTPAUTH_PLAIN;
306 if (strcasestr(p, "LOGIN"))
307 session->avail_auth_type |= SMTPAUTH_LOGIN;
308 if (strcasestr(p, "CRAM-MD5"))
309 session->avail_auth_type |= SMTPAUTH_CRAM_MD5;
310 if (strcasestr(p, "DIGEST-MD5"))
311 session->avail_auth_type |= SMTPAUTH_DIGEST_MD5;
313 if (g_ascii_strncasecmp(p, "SIZE", 4) == 0) {
315 session->max_message_size = atoi(p);
316 session->esmtp_flags |= ESMTP_SIZE;
318 if (g_ascii_strncasecmp(p, "STARTTLS", 8) == 0) {
320 session->avail_auth_type |= SMTPAUTH_TLS_AVAILABLE;
323 } else if ((msg[0] == '1' || msg[0] == '2' || msg[0] == '3') &&
324 (msg[3] == ' ' || msg[3] == '\0'))
326 else if (msg[0] == '5' && msg[1] == '0' &&
327 (msg[2] == '4' || msg[2] == '3' || msg[2] == '1'))
333 #if (defined(USE_OPENSSL) || defined (USE_GNUTLS))
334 static gint smtp_starttls(SMTPSession *session)
336 session->state = SMTP_STARTTLS;
338 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "STARTTLS") < 0)
340 log_print(LOG_PROTOCOL, "ESMTP> STARTTLS\n");
346 static gint smtp_auth_cram_md5(SMTPSession *session)
348 session->state = SMTP_AUTH;
349 session->auth_type = SMTPAUTH_CRAM_MD5;
351 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "AUTH CRAM-MD5") < 0)
353 log_print(LOG_PROTOCOL, "ESMTP> AUTH CRAM-MD5\n");
358 static gint smtp_auth_plain(SMTPSession *session)
360 gchar buf[MSGBUFSIZE];
366 int b64len = (1 + strlen(session->user) + 1 + strlen(session->pass) + 1);
367 gchar *b64buf = g_malloc(b64len);
369 /* use the char *ptr to walk the base64 string with embedded \0 */
373 session->state = SMTP_AUTH_PLAIN;
374 session->auth_type = SMTPAUTH_PLAIN;
376 memset(buf, 0, sizeof buf);
379 * have to construct the string bit by bit. sprintf can't do it in one.
380 * first field is null, so string is \0<user>\0<password>
385 g_snprintf (a, b64len - 1, "%s", session->user);
387 b64cnt = strlen(session->user)+1;
390 g_snprintf (a, b64len - b64cnt - 1, "%s", session->pass);
391 b64cnt += strlen(session->pass) + 1;
394 * reuse the char *ptr to offset into the textbuf to meld
395 * the plaintext ESMTP message and the base64 string value
397 strcpy(buf, "AUTH PLAIN ");
398 a = buf + strlen(buf);
399 base64_encode(a, b64buf, b64cnt);
401 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf) < 0)
404 log_print(LOG_PROTOCOL, "ESMTP> [AUTH PLAIN]\n");
411 static gint smtp_auth_login(SMTPSession *session)
413 session->state = SMTP_AUTH;
414 session->auth_type = SMTPAUTH_LOGIN;
416 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "AUTH LOGIN") < 0)
418 log_print(LOG_PROTOCOL, "ESMTP> AUTH LOGIN\n");
423 static gint smtp_helo(SMTPSession *session)
425 gchar buf[MSGBUFSIZE];
427 session->state = SMTP_HELO;
429 g_snprintf(buf, sizeof(buf), "HELO %s",
430 session->hostname ? session->hostname : get_domain_name());
431 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf) < 0)
433 log_print(LOG_PROTOCOL, "SMTP> %s\n", buf);
438 static gint smtp_rcpt(SMTPSession *session)
440 gchar buf[MSGBUFSIZE];
443 g_return_val_if_fail(session->cur_to != NULL, SM_ERROR);
445 session->state = SMTP_RCPT;
447 to = (gchar *)session->cur_to->data;
450 g_snprintf(buf, sizeof(buf), "RCPT TO:%s", to);
452 g_snprintf(buf, sizeof(buf), "RCPT TO:<%s>", to);
453 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf) < 0)
455 log_print(LOG_PROTOCOL, "SMTP> %s\n", buf);
457 session->cur_to = session->cur_to->next;
462 static gint smtp_data(SMTPSession *session)
464 session->state = SMTP_DATA;
466 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "DATA") < 0)
468 log_print(LOG_PROTOCOL, "SMTP> DATA\n");
473 static gint smtp_send_data(SMTPSession *session)
475 session->state = SMTP_SEND_DATA;
477 session_send_data(SESSION(session), session->send_data,
478 session->send_data_len);
483 static gint smtp_make_ready(SMTPSession *session)
485 session->state = SMTP_MAIL_SENT_OK;
490 gint smtp_quit(SMTPSession *session)
492 session->state = SMTP_QUIT;
494 session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "QUIT");
495 log_print(LOG_PROTOCOL, "SMTP> QUIT\n");
500 static gint smtp_eom(SMTPSession *session)
502 session->state = SMTP_EOM;
504 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, ".") < 0)
506 log_print(LOG_PROTOCOL, "SMTP> . (EOM)\n");
511 static gint smtp_session_recv_msg(Session *session, const gchar *msg)
513 SMTPSession *smtp_session = SMTP_SESSION(session);
514 gboolean cont = FALSE;
517 if (strlen(msg) < 4) {
518 log_warning(LOG_PROTOCOL, _("bad SMTP response\n"));
522 switch (smtp_session->state) {
526 case SMTP_AUTH_PLAIN:
527 case SMTP_AUTH_LOGIN_USER:
528 case SMTP_AUTH_LOGIN_PASS:
529 case SMTP_AUTH_CRAM_MD5:
530 log_print(LOG_PROTOCOL, "ESMTP< %s\n", msg);
533 log_print(LOG_PROTOCOL, "SMTP< %s\n", msg);
537 if (msg[0] == '5' && msg[1] == '0' &&
538 (msg[2] == '4' || msg[2] == '3' || msg[2] == '1')) {
539 log_warning(LOG_PROTOCOL, _("error occurred on SMTP session\n"));
540 smtp_session->state = SMTP_ERROR;
541 smtp_session->error_val = SM_ERROR;
542 g_free(smtp_session->error_msg);
543 smtp_session->error_msg = g_strdup(msg);
547 if (!strncmp(msg, "535", 3)) {
548 log_warning(LOG_PROTOCOL, _("error occurred on authentication\n"));
549 smtp_session->state = SMTP_ERROR;
550 smtp_session->error_val = SM_AUTHFAIL;
551 g_free(smtp_session->error_msg);
552 smtp_session->error_msg = g_strdup(msg);
556 if (msg[0] != '1' && msg[0] != '2' && msg[0] != '3') {
557 log_warning(LOG_PROTOCOL, _("error occurred on SMTP session\n"));
558 smtp_session->state = SMTP_ERROR;
559 smtp_session->error_val = SM_ERROR;
560 g_free(smtp_session->error_msg);
561 smtp_session->error_msg = g_strdup(msg);
567 else if (msg[3] != ' ' && msg[3] != '\0') {
568 log_warning(LOG_PROTOCOL, _("bad SMTP response\n"));
569 smtp_session->state = SMTP_ERROR;
570 smtp_session->error_val = SM_UNRECOVERABLE;
574 /* ignore all multiline responses except for EHLO */
575 if (cont && smtp_session->state != SMTP_EHLO)
576 return session_recv_msg(session);
578 switch (smtp_session->state) {
580 if (strstr(msg, "ESMTP"))
581 smtp_session->is_esmtp = TRUE;
583 #if (defined(USE_OPENSSL) || defined (USE_GNUTLS))
584 if (smtp_session->user || session->ssl_type != SSL_NONE ||
585 smtp_session->is_esmtp)
587 if (smtp_session->user || smtp_session->is_esmtp)
589 ret = smtp_ehlo(smtp_session);
591 ret = smtp_helo(smtp_session);
594 ret = smtp_from(smtp_session);
597 ret = smtp_ehlo_recv(smtp_session, msg);
600 if (smtp_session->max_message_size > 0
601 && smtp_session->max_message_size <
602 smtp_session->send_data_len) {
603 log_warning(LOG_PROTOCOL, _("Message is too big "
604 "(Maximum size is %s)\n"),
606 (goffset)(smtp_session->max_message_size)));
607 smtp_session->state = SMTP_ERROR;
608 smtp_session->error_val = SM_ERROR;
611 #if (defined(USE_OPENSSL) || defined (USE_GNUTLS))
612 if (session->ssl_type == SSL_STARTTLS &&
613 smtp_session->tls_init_done == FALSE) {
614 ret = smtp_starttls(smtp_session);
618 if (smtp_session->user) {
619 if (smtp_auth(smtp_session) != SM_OK) {
620 #if (defined(USE_OPENSSL) || defined (USE_GNUTLS))
621 if (session->ssl_type == SSL_NONE
622 && smtp_session->tls_init_done == FALSE
623 && (smtp_session->avail_auth_type & SMTPAUTH_TLS_AVAILABLE))
624 ret = smtp_starttls(smtp_session);
627 ret = smtp_from(smtp_session);
630 ret = smtp_from(smtp_session);
633 #if (defined(USE_OPENSSL) || defined (USE_GNUTLS))
634 if (session_start_tls(session) < 0) {
635 log_warning(LOG_PROTOCOL, _("couldn't start TLS session\n"));
636 smtp_session->state = SMTP_ERROR;
637 smtp_session->error_val = SM_ERROR;
640 smtp_session->tls_init_done = TRUE;
641 ret = smtp_ehlo(smtp_session);
645 ret = smtp_auth_recv(smtp_session, msg);
647 case SMTP_AUTH_LOGIN_USER:
648 ret = smtp_auth_login_user_recv(smtp_session, msg);
650 case SMTP_AUTH_PLAIN:
651 case SMTP_AUTH_LOGIN_PASS:
652 case SMTP_AUTH_CRAM_MD5:
653 ret = smtp_from(smtp_session);
656 if (smtp_session->cur_to)
657 ret = smtp_rcpt(smtp_session);
660 if (smtp_session->cur_to)
661 ret = smtp_rcpt(smtp_session);
663 ret = smtp_data(smtp_session);
666 ret = smtp_send_data(smtp_session);
669 smtp_make_ready(smtp_session);
672 session_disconnect(session);
676 log_warning(LOG_PROTOCOL, _("error occurred on SMTP session\n"));
677 smtp_session->error_val = SM_ERROR;
681 if (cont && ret == SM_OK)
682 return session_recv_msg(session);
685 smtp_session->error_val = SM_ERROR;
687 return ret == SM_OK ? 0 : -1;
690 static gint smtp_session_send_data_finished(Session *session, guint len)
692 return smtp_eom(SMTP_SESSION(session));