2 * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
3 * Copyright (C) 1999-2012 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/>.
22 #include "claws-features.h"
27 #include <glib/gi18n.h>
40 static void smtp_session_destroy(Session *session);
42 static gint smtp_auth(SMTPSession *session);
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;
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[MESSAGEBUFSIZE];
128 gchar *mail_size = NULL;
130 cm_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 cm_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)
166 (session->avail_auth_type & SMTPAUTH_CRAM_MD5) != 0)
167 smtp_auth_cram_md5(session);
168 else if ((session->forced_auth_type == SMTPAUTH_LOGIN
169 || session->forced_auth_type == 0)
171 (session->avail_auth_type & SMTPAUTH_LOGIN) != 0)
172 smtp_auth_login(session);
173 else if ((session->forced_auth_type == SMTPAUTH_PLAIN
174 || session->forced_auth_type == 0)
176 (session->avail_auth_type & SMTPAUTH_PLAIN) != 0)
177 smtp_auth_plain(session);
178 else if (session->forced_auth_type == 0) {
179 log_warning(LOG_PROTOCOL, _("No SMTP AUTH method available\n"));
182 log_warning(LOG_PROTOCOL, _("Selected SMTP AUTH method not available\n"));
189 static gint smtp_auth_recv(SMTPSession *session, const gchar *msg)
191 gchar buf[MESSAGEBUFSIZE], *tmp;
193 switch (session->auth_type) {
195 session->state = SMTP_AUTH_LOGIN_USER;
197 if (!strncmp(msg, "334 ", 4)) {
198 tmp = g_base64_encode(session->user, strlen(session->user));
200 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL,
206 log_print(LOG_PROTOCOL, "ESMTP> [USERID]\n");
208 /* Server rejects AUTH */
209 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL,
212 log_print(LOG_PROTOCOL, "ESMTP> *\n");
215 case SMTPAUTH_CRAM_MD5:
216 session->state = SMTP_AUTH_CRAM_MD5;
218 if (!strncmp(msg, "334 ", 4)) {
223 guchar hexdigest[33];
225 challenge = g_base64_decode_zero(msg + 4, &challengelen);
226 log_print(LOG_PROTOCOL, "ESMTP< [Decoded: %s]\n", challenge);
228 g_snprintf(buf, sizeof(buf), "%s", session->pass);
229 md5_hex_hmac(hexdigest, challenge, challengelen,
230 buf, strlen(session->pass));
233 response = g_strdup_printf
234 ("%s %s", session->user, hexdigest);
235 log_print(LOG_PROTOCOL, "ESMTP> [Encoded: %s]\n", response);
237 response64 = g_base64_encode(response, strlen(response));
240 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL,
245 log_print(LOG_PROTOCOL, "ESMTP> %s\n", response64);
248 /* Server rejects AUTH */
249 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL,
252 log_print(LOG_PROTOCOL, "ESMTP> *\n");
255 case SMTPAUTH_DIGEST_MD5:
257 /* stop smtp_auth when no correct authtype */
258 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "*") < 0)
260 log_print(LOG_PROTOCOL, "ESMTP> *\n");
267 static gint smtp_auth_login_user_recv(SMTPSession *session, const gchar *msg)
271 session->state = SMTP_AUTH_LOGIN_PASS;
273 if (!strncmp(msg, "334 ", 4)) {
274 tmp = g_base64_encode(session->pass, strlen(session->pass));
276 /* Server rejects AUTH */
280 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, tmp) < 0) {
286 log_print(LOG_PROTOCOL, "ESMTP> [PASSWORD]\n");
291 static gint smtp_ehlo(SMTPSession *session)
293 gchar buf[MESSAGEBUFSIZE];
295 session->state = SMTP_EHLO;
297 session->avail_auth_type = 0;
299 g_snprintf(buf, sizeof(buf), "EHLO %s",
300 session->hostname ? session->hostname : get_domain_name());
301 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf) < 0)
303 log_print(LOG_PROTOCOL, "ESMTP> %s\n", buf);
308 static gint smtp_ehlo_recv(SMTPSession *session, const gchar *msg)
310 if (strncmp(msg, "250", 3) == 0) {
311 const gchar *p = msg;
313 if (*p == '-' || *p == ' ') p++;
314 if (g_ascii_strncasecmp(p, "AUTH", 4) == 0) {
316 if (strcasestr(p, "PLAIN"))
317 session->avail_auth_type |= SMTPAUTH_PLAIN;
318 if (strcasestr(p, "LOGIN"))
319 session->avail_auth_type |= SMTPAUTH_LOGIN;
320 if (strcasestr(p, "CRAM-MD5"))
321 session->avail_auth_type |= SMTPAUTH_CRAM_MD5;
322 if (strcasestr(p, "DIGEST-MD5"))
323 session->avail_auth_type |= SMTPAUTH_DIGEST_MD5;
325 if (g_ascii_strncasecmp(p, "SIZE", 4) == 0) {
327 session->max_message_size = atoi(p);
328 session->esmtp_flags |= ESMTP_SIZE;
330 if (g_ascii_strncasecmp(p, "STARTTLS", 8) == 0) {
332 session->avail_auth_type |= SMTPAUTH_TLS_AVAILABLE;
335 } else if ((msg[0] == '1' || msg[0] == '2' || msg[0] == '3') &&
336 (msg[3] == ' ' || msg[3] == '\0'))
338 else if (msg[0] == '5' && msg[1] == '0' &&
339 (msg[2] == '4' || msg[2] == '3' || msg[2] == '1'))
346 static gint smtp_starttls(SMTPSession *session)
348 session->state = SMTP_STARTTLS;
350 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "STARTTLS") < 0)
352 log_print(LOG_PROTOCOL, "ESMTP> STARTTLS\n");
358 static gint smtp_auth_cram_md5(SMTPSession *session)
360 session->state = SMTP_AUTH;
361 session->auth_type = SMTPAUTH_CRAM_MD5;
363 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "AUTH CRAM-MD5") < 0)
365 log_print(LOG_PROTOCOL, "ESMTP> AUTH CRAM-MD5\n");
370 static gint smtp_auth_plain(SMTPSession *session)
372 gchar buf[MESSAGEBUFSIZE], *b64buf, *out;
375 session->state = SMTP_AUTH_PLAIN;
376 session->auth_type = SMTPAUTH_PLAIN;
378 memset(buf, 0, sizeof buf);
380 /* "\0user\0password" */
381 len = sprintf(buf, "%c%s%c%s", '\0', session->user, '\0', session->pass);
382 b64buf = g_base64_encode(buf, len);
383 out = g_strconcat("AUTH PLAIN ", b64buf, NULL);
386 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, out) < 0) {
393 log_print(LOG_PROTOCOL, "ESMTP> [AUTH PLAIN]\n");
398 static gint smtp_auth_login(SMTPSession *session)
400 session->state = SMTP_AUTH;
401 session->auth_type = SMTPAUTH_LOGIN;
403 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "AUTH LOGIN") < 0)
405 log_print(LOG_PROTOCOL, "ESMTP> AUTH LOGIN\n");
410 static gint smtp_helo(SMTPSession *session)
412 gchar buf[MESSAGEBUFSIZE];
414 session->state = SMTP_HELO;
416 g_snprintf(buf, sizeof(buf), "HELO %s",
417 session->hostname ? session->hostname : get_domain_name());
418 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf) < 0)
420 log_print(LOG_PROTOCOL, "SMTP> %s\n", buf);
425 static gint smtp_rcpt(SMTPSession *session)
427 gchar buf[MESSAGEBUFSIZE];
430 cm_return_val_if_fail(session->cur_to != NULL, SM_ERROR);
432 session->state = SMTP_RCPT;
434 to = (gchar *)session->cur_to->data;
437 g_snprintf(buf, sizeof(buf), "RCPT TO:%s", to);
439 g_snprintf(buf, sizeof(buf), "RCPT TO:<%s>", to);
440 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf) < 0)
442 log_print(LOG_PROTOCOL, "SMTP> %s\n", buf);
444 session->cur_to = session->cur_to->next;
449 static gint smtp_data(SMTPSession *session)
451 session->state = SMTP_DATA;
453 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "DATA") < 0)
455 log_print(LOG_PROTOCOL, "SMTP> DATA\n");
460 static gint smtp_send_data(SMTPSession *session)
462 session->state = SMTP_SEND_DATA;
464 session_send_data(SESSION(session), session->send_data,
465 session->send_data_len);
470 static gint smtp_make_ready(SMTPSession *session)
472 session->state = SMTP_MAIL_SENT_OK;
477 gint smtp_quit(SMTPSession *session)
479 session->state = SMTP_QUIT;
481 session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "QUIT");
482 log_print(LOG_PROTOCOL, "SMTP> QUIT\n");
487 static gint smtp_eom(SMTPSession *session)
489 session->state = SMTP_EOM;
491 if (session_send_msg(SESSION(session), SESSION_MSG_NORMAL, ".") < 0)
493 log_print(LOG_PROTOCOL, "SMTP> . (EOM)\n");
498 static gint smtp_session_recv_msg(Session *session, const gchar *msg)
500 SMTPSession *smtp_session = SMTP_SESSION(session);
501 gboolean cont = FALSE;
504 if (strlen(msg) < 4) {
505 log_warning(LOG_PROTOCOL, _("bad SMTP response\n"));
509 switch (smtp_session->state) {
513 case SMTP_AUTH_PLAIN:
514 case SMTP_AUTH_LOGIN_USER:
515 case SMTP_AUTH_LOGIN_PASS:
516 case SMTP_AUTH_CRAM_MD5:
517 log_print(LOG_PROTOCOL, "ESMTP< %s\n", msg);
520 log_print(LOG_PROTOCOL, "SMTP< %s\n", msg);
524 /* ignore all multiline responses except for EHLO */
525 if (msg[3] == '-' && smtp_session->state != SMTP_EHLO)
526 return session_recv_msg(session);
528 if (msg[0] == '5' && msg[1] == '0' &&
529 (msg[2] == '4' || msg[2] == '3' || msg[2] == '1')) {
530 log_warning(LOG_PROTOCOL, _("error occurred on SMTP session\n"));
531 smtp_session->state = SMTP_ERROR;
532 smtp_session->error_val = SM_ERROR;
533 g_free(smtp_session->error_msg);
534 smtp_session->error_msg = g_strdup(msg);
538 if (!strncmp(msg, "535", 3)) {
539 log_warning(LOG_PROTOCOL, _("error occurred on authentication\n"));
540 smtp_session->state = SMTP_ERROR;
541 smtp_session->error_val = SM_AUTHFAIL;
542 g_free(smtp_session->error_msg);
543 smtp_session->error_msg = g_strdup(msg);
547 if (msg[0] != '1' && msg[0] != '2' && msg[0] != '3') {
548 log_warning(LOG_PROTOCOL, _("error occurred on SMTP session\n"));
549 smtp_session->state = SMTP_ERROR;
550 smtp_session->error_val = SM_ERROR;
551 g_free(smtp_session->error_msg);
552 smtp_session->error_msg = g_strdup(msg);
558 else if (msg[3] != ' ' && msg[3] != '\0') {
559 log_warning(LOG_PROTOCOL, _("bad SMTP response\n"));
560 smtp_session->state = SMTP_ERROR;
561 smtp_session->error_val = SM_UNRECOVERABLE;
565 switch (smtp_session->state) {
567 if (strstr(msg, "ESMTP"))
568 smtp_session->is_esmtp = TRUE;
570 if (smtp_session->user || session->ssl_type != SSL_NONE ||
571 smtp_session->is_esmtp)
573 if (smtp_session->user || smtp_session->is_esmtp)
575 ret = smtp_ehlo(smtp_session);
577 ret = smtp_helo(smtp_session);
580 ret = smtp_from(smtp_session);
583 ret = smtp_ehlo_recv(smtp_session, msg);
586 if (smtp_session->max_message_size > 0
587 && smtp_session->max_message_size <
588 smtp_session->send_data_len) {
589 log_warning(LOG_PROTOCOL, _("Message is too big "
590 "(Maximum size is %s)\n"),
592 (goffset)(smtp_session->max_message_size)));
593 smtp_session->state = SMTP_ERROR;
594 smtp_session->error_val = SM_ERROR;
598 if (session->ssl_type == SSL_STARTTLS &&
599 smtp_session->tls_init_done == FALSE) {
600 ret = smtp_starttls(smtp_session);
604 if (smtp_session->user) {
605 if (smtp_auth(smtp_session) != SM_OK) {
607 if (session->ssl_type == SSL_NONE
608 && smtp_session->tls_init_done == FALSE
609 && (smtp_session->avail_auth_type & SMTPAUTH_TLS_AVAILABLE))
610 ret = smtp_starttls(smtp_session);
613 ret = smtp_from(smtp_session);
616 ret = smtp_from(smtp_session);
620 if (session_start_tls(session) < 0) {
621 log_warning(LOG_PROTOCOL, _("couldn't start TLS session\n"));
622 smtp_session->state = SMTP_ERROR;
623 smtp_session->error_val = SM_ERROR;
626 smtp_session->tls_init_done = TRUE;
627 ret = smtp_ehlo(smtp_session);
631 ret = smtp_auth_recv(smtp_session, msg);
633 case SMTP_AUTH_LOGIN_USER:
634 ret = smtp_auth_login_user_recv(smtp_session, msg);
636 case SMTP_AUTH_PLAIN:
637 case SMTP_AUTH_LOGIN_PASS:
638 case SMTP_AUTH_CRAM_MD5:
639 ret = smtp_from(smtp_session);
642 if (smtp_session->cur_to)
643 ret = smtp_rcpt(smtp_session);
646 if (smtp_session->cur_to)
647 ret = smtp_rcpt(smtp_session);
649 ret = smtp_data(smtp_session);
652 ret = smtp_send_data(smtp_session);
655 smtp_make_ready(smtp_session);
658 session_disconnect(session);
662 log_warning(LOG_PROTOCOL, _("error occurred on SMTP session\n"));
663 smtp_session->error_val = SM_ERROR;
667 if (cont && ret == SM_OK)
668 return session_recv_msg(session);
671 smtp_session->error_val = SM_ERROR;
673 return ret == SM_OK ? 0 : -1;
676 static gint smtp_session_send_data_finished(Session *session, guint len)
678 return smtp_eom(SMTP_SESSION(session));