682 lines
16 KiB
C
682 lines
16 KiB
C
/*
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* Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
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* Copyright (C) 1999-2004 Hiroyuki Yamamoto
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#ifdef ENABLE_NLS
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#include <glib/gi18n.h>
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#else
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#define _(a) (a)
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#define N_(a) (a)
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#endif
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#include <stdio.h>
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#include <string.h>
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#include "smtp.h"
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#include "md5.h"
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#include "base64.h"
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#include "utils.h"
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#include "log.h"
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static void smtp_session_destroy(Session *session);
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static gint smtp_auth(SMTPSession *session);
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static gint smtp_starttls(SMTPSession *session);
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static gint smtp_auth_cram_md5(SMTPSession *session);
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static gint smtp_auth_login(SMTPSession *session);
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static gint smtp_auth_plain(SMTPSession *session);
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static gint smtp_ehlo(SMTPSession *session);
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static gint smtp_ehlo_recv(SMTPSession *session, const gchar *msg);
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static gint smtp_helo(SMTPSession *session);
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static gint smtp_rcpt(SMTPSession *session);
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static gint smtp_data(SMTPSession *session);
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static gint smtp_send_data(SMTPSession *session);
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static gint smtp_make_ready(SMTPSession *session);
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static gint smtp_eom(SMTPSession *session);
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static gint smtp_session_recv_msg(Session *session, const gchar *msg);
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static gint smtp_session_send_data_finished(Session *session, guint len);
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Session *smtp_session_new(void)
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{
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SMTPSession *session;
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session = g_new0(SMTPSession, 1);
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session_init(SESSION(session));
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SESSION(session)->type = SESSION_SMTP;
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SESSION(session)->recv_msg = smtp_session_recv_msg;
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SESSION(session)->recv_data_finished = NULL;
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SESSION(session)->send_data_finished = smtp_session_send_data_finished;
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SESSION(session)->destroy = smtp_session_destroy;
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session->state = SMTP_READY;
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#if USE_OPENSSL
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session->tls_init_done = FALSE;
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#endif
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session->hostname = NULL;
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session->user = NULL;
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session->pass = NULL;
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session->from = NULL;
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session->to_list = NULL;
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session->cur_to = NULL;
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session->send_data = NULL;
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session->send_data_len = 0;
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session->max_message_size = -1;
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session->avail_auth_type = 0;
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session->forced_auth_type = 0;
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session->auth_type = 0;
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session->esmtp_flags = 0;
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session->error_val = SM_OK;
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session->error_msg = NULL;
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return SESSION(session);
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}
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static void smtp_session_destroy(Session *session)
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{
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SMTPSession *smtp_session = SMTP_SESSION(session);
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g_free(smtp_session->hostname);
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g_free(smtp_session->user);
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g_free(smtp_session->pass);
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g_free(smtp_session->from);
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g_free(smtp_session->send_data);
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g_free(smtp_session->error_msg);
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}
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gint smtp_from(SMTPSession *session)
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{
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gchar buf[MSGBUFSIZE];
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gchar *mail_size = NULL;
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g_return_val_if_fail(session->from != NULL, SM_ERROR);
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session->state = SMTP_FROM;
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if (session->is_esmtp && (session->esmtp_flags & ESMTP_SIZE)!=0)
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mail_size = g_strdup_printf(" SIZE=%d", session->send_data_len);
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else
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mail_size = g_strdup("");
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if (strchr(session->from, '<'))
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g_snprintf(buf, sizeof(buf), "MAIL FROM:%s%s", session->from,
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mail_size);
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else
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g_snprintf(buf, sizeof(buf), "MAIL FROM:<%s>%s", session->from,
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mail_size);
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g_free(mail_size);
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session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf);
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log_print("%sSMTP> %s\n", (session->is_esmtp?"E":""), buf);
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return SM_OK;
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}
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static gint smtp_auth(SMTPSession *session)
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{
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g_return_val_if_fail(session->user != NULL, SM_ERROR);
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session->state = SMTP_AUTH;
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if (session->forced_auth_type == SMTPAUTH_CRAM_MD5 ||
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(session->forced_auth_type == 0 &&
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(session->avail_auth_type & SMTPAUTH_CRAM_MD5) != 0))
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smtp_auth_cram_md5(session);
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else if (session->forced_auth_type == SMTPAUTH_LOGIN ||
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(session->forced_auth_type == 0 &&
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(session->avail_auth_type & SMTPAUTH_LOGIN) != 0))
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smtp_auth_login(session);
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else if (session->forced_auth_type == SMTPAUTH_PLAIN ||
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(session->forced_auth_type == 0 &&
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(session->avail_auth_type & SMTPAUTH_PLAIN) != 0))
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smtp_auth_plain(session);
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else {
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log_warning(_("SMTP AUTH not available\n"));
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return SM_AUTHFAIL;
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}
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return SM_OK;
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}
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static gint smtp_auth_recv(SMTPSession *session, const gchar *msg)
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{
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gchar buf[MSGBUFSIZE];
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switch (session->auth_type) {
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case SMTPAUTH_LOGIN:
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session->state = SMTP_AUTH_LOGIN_USER;
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if (!strncmp(msg, "334 ", 4)) {
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base64_encode(buf, session->user, strlen(session->user));
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session_send_msg(SESSION(session), SESSION_MSG_NORMAL,
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buf);
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log_print("ESMTP> [USERID]\n");
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} else {
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/* Server rejects AUTH */
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session_send_msg(SESSION(session), SESSION_MSG_NORMAL,
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"*");
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log_print("ESMTP> *\n");
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}
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break;
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case SMTPAUTH_CRAM_MD5:
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session->state = SMTP_AUTH_CRAM_MD5;
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if (!strncmp(msg, "334 ", 4)) {
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gchar *response;
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gchar *response64;
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gchar *challenge;
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gint challengelen;
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guchar hexdigest[33];
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challenge = g_malloc(strlen(msg + 4) + 1);
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challengelen = base64_decode(challenge, msg + 4, -1);
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challenge[challengelen] = '\0';
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log_print("ESMTP< [Decoded: %s]\n", challenge);
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g_snprintf(buf, sizeof(buf), "%s", session->pass);
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md5_hex_hmac(hexdigest, challenge, challengelen,
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buf, strlen(session->pass));
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g_free(challenge);
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response = g_strdup_printf
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("%s %s", session->user, hexdigest);
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log_print("ESMTP> [Encoded: %s]\n", response);
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response64 = g_malloc((strlen(response) + 3) * 2 + 1);
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base64_encode(response64, response, strlen(response));
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g_free(response);
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session_send_msg(SESSION(session), SESSION_MSG_NORMAL,
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response64);
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log_print("ESMTP> %s\n", response64);
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g_free(response64);
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} else {
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/* Server rejects AUTH */
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session_send_msg(SESSION(session), SESSION_MSG_NORMAL,
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"*");
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log_print("ESMTP> *\n");
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}
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break;
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case SMTPAUTH_DIGEST_MD5:
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default:
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/* stop smtp_auth when no correct authtype */
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session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "*");
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log_print("ESMTP> *\n");
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break;
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}
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return SM_OK;
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}
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static gint smtp_auth_login_user_recv(SMTPSession *session, const gchar *msg)
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{
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gchar buf[MSGBUFSIZE];
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session->state = SMTP_AUTH_LOGIN_PASS;
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if (!strncmp(msg, "334 ", 4))
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base64_encode(buf, session->pass, strlen(session->pass));
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else
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/* Server rejects AUTH */
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g_snprintf(buf, sizeof(buf), "*");
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session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf);
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log_print("ESMTP> [PASSWORD]\n");
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return SM_OK;
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}
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static gint smtp_ehlo(SMTPSession *session)
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{
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gchar buf[MSGBUFSIZE];
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session->state = SMTP_EHLO;
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session->avail_auth_type = 0;
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g_snprintf(buf, sizeof(buf), "EHLO %s",
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session->hostname ? session->hostname : get_domain_name());
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session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf);
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log_print("ESMTP> %s\n", buf);
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return SM_OK;
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}
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static gint smtp_ehlo_recv(SMTPSession *session, const gchar *msg)
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{
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if (strncmp(msg, "250", 3) == 0) {
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const gchar *p = msg;
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p += 3;
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if (*p == '-' || *p == ' ') p++;
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if (g_ascii_strncasecmp(p, "AUTH", 4) == 0) {
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p += 5;
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if (strcasestr(p, "PLAIN"))
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session->avail_auth_type |= SMTPAUTH_PLAIN;
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if (strcasestr(p, "LOGIN"))
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session->avail_auth_type |= SMTPAUTH_LOGIN;
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if (strcasestr(p, "CRAM-MD5"))
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session->avail_auth_type |= SMTPAUTH_CRAM_MD5;
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if (strcasestr(p, "DIGEST-MD5"))
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session->avail_auth_type |= SMTPAUTH_DIGEST_MD5;
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}
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if (g_ascii_strncasecmp(p, "SIZE", 4) == 0) {
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p += 5;
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session->max_message_size = atoi(p);
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session->esmtp_flags |= ESMTP_SIZE;
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}
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if (g_ascii_strncasecmp(p, "STARTTLS", 8) == 0) {
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p += 9;
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session->avail_auth_type |= SMTPAUTH_TLS_AVAILABLE;
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}
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return SM_OK;
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} else if ((msg[0] == '1' || msg[0] == '2' || msg[0] == '3') &&
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(msg[3] == ' ' || msg[3] == '\0'))
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return SM_OK;
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else if (msg[0] == '5' && msg[1] == '0' &&
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(msg[2] == '4' || msg[2] == '3' || msg[2] == '1'))
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return SM_ERROR;
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return SM_ERROR;
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}
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static gint smtp_starttls(SMTPSession *session)
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{
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session->state = SMTP_STARTTLS;
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session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "STARTTLS");
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log_print("ESMTP> STARTTLS\n");
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return SM_OK;
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}
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static gint smtp_auth_cram_md5(SMTPSession *session)
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{
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session->state = SMTP_AUTH;
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session->auth_type = SMTPAUTH_CRAM_MD5;
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session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "AUTH CRAM-MD5");
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log_print("ESMTP> AUTH CRAM-MD5\n");
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return SM_OK;
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}
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static gint smtp_auth_plain(SMTPSession *session)
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{
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gchar buf[MSGBUFSIZE];
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/*
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* +1 +1 +1
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* \0<user>\0<pass>\0
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*/
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int b64len = (1 + strlen(session->user) + 1 + strlen(session->pass) + 1);
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gchar *b64buf = g_malloc(b64len);
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/* use the char *ptr to walk the base64 string with embedded \0 */
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char *a = b64buf;
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int b64cnt = 0;
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session->state = SMTP_AUTH_PLAIN;
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session->auth_type = SMTPAUTH_PLAIN;
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memset(buf, 0, sizeof buf);
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/*
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* have to construct the string bit by bit. sprintf can't do it in one.
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* first field is null, so string is \0<user>\0<password>
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*/
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*a = 0;
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a++;
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g_snprintf (a, b64len - 1, "%s", session->user);
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b64cnt = strlen(session->user)+1;
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a += b64cnt;
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g_snprintf (a, b64len - b64cnt - 1, "%s", session->pass);
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b64cnt += strlen(session->pass) + 1;
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/*
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* reuse the char *ptr to offset into the textbuf to meld
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* the plaintext ESMTP message and the base64 string value
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*/
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strcpy(buf, "AUTH PLAIN ");
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a = buf + strlen(buf);
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base64_encode(a, b64buf, b64cnt);
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session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf);
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log_print("ESMTP> [AUTH PLAIN]\n");
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g_free(b64buf);
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return SM_OK;
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}
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static gint smtp_auth_login(SMTPSession *session)
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{
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session->state = SMTP_AUTH;
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session->auth_type = SMTPAUTH_LOGIN;
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session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "AUTH LOGIN");
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log_print("ESMTP> AUTH LOGIN\n");
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return SM_OK;
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}
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static gint smtp_helo(SMTPSession *session)
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{
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gchar buf[MSGBUFSIZE];
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session->state = SMTP_HELO;
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g_snprintf(buf, sizeof(buf), "HELO %s",
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session->hostname ? session->hostname : get_domain_name());
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session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf);
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log_print("SMTP> %s\n", buf);
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return SM_OK;
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}
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static gint smtp_rcpt(SMTPSession *session)
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{
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gchar buf[MSGBUFSIZE];
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gchar *to;
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g_return_val_if_fail(session->cur_to != NULL, SM_ERROR);
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session->state = SMTP_RCPT;
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to = (gchar *)session->cur_to->data;
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if (strchr(to, '<'))
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g_snprintf(buf, sizeof(buf), "RCPT TO:%s", to);
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else
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g_snprintf(buf, sizeof(buf), "RCPT TO:<%s>", to);
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session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf);
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log_print("SMTP> %s\n", buf);
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session->cur_to = session->cur_to->next;
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return SM_OK;
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}
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static gint smtp_data(SMTPSession *session)
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{
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session->state = SMTP_DATA;
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session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "DATA");
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log_print("SMTP> DATA\n");
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return SM_OK;
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}
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static gint smtp_send_data(SMTPSession *session)
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{
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session->state = SMTP_SEND_DATA;
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session_send_data(SESSION(session), session->send_data,
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session->send_data_len);
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return SM_OK;
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}
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#if 0
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static gint smtp_rset(SMTPSession *session)
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{
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session->state = SMTP_RSET;
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session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "RSET");
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log_print("SMTP> RSET\n");
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return SM_OK;
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}
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#endif
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static gint smtp_make_ready(SMTPSession *session)
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{
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session->state = SMTP_MAIL_SENT_OK;
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return SM_OK;
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}
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gint smtp_quit(SMTPSession *session)
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{
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session->state = SMTP_QUIT;
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session_send_msg(SESSION(session), SESSION_MSG_NORMAL, "QUIT");
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log_print("SMTP> QUIT\n");
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return SM_OK;
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}
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static gint smtp_eom(SMTPSession *session)
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{
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session->state = SMTP_EOM;
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session_send_msg(SESSION(session), SESSION_MSG_NORMAL, ".");
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log_print("SMTP> . (EOM)\n");
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return SM_OK;
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}
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static gint smtp_session_recv_msg(Session *session, const gchar *msg)
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{
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SMTPSession *smtp_session = SMTP_SESSION(session);
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gboolean cont = FALSE;
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if (strlen(msg) < 4) {
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log_warning(_("bad SMTP response\n"));
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return -1;
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}
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switch (smtp_session->state) {
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case SMTP_EHLO:
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case SMTP_STARTTLS:
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case SMTP_AUTH:
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case SMTP_AUTH_PLAIN:
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case SMTP_AUTH_LOGIN_USER:
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case SMTP_AUTH_LOGIN_PASS:
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case SMTP_AUTH_CRAM_MD5:
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log_print("ESMTP< %s\n", msg);
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break;
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default:
|
|
log_print("SMTP< %s\n", msg);
|
|
break;
|
|
}
|
|
|
|
if (msg[0] == '5' && msg[1] == '0' &&
|
|
(msg[2] == '4' || msg[2] == '3' || msg[2] == '1')) {
|
|
log_warning(_("error occurred on SMTP session\n"));
|
|
smtp_session->state = SMTP_ERROR;
|
|
smtp_session->error_val = SM_ERROR;
|
|
g_free(smtp_session->error_msg);
|
|
smtp_session->error_msg = g_strdup(msg);
|
|
return -1;
|
|
}
|
|
|
|
if (!strncmp(msg, "535", 3)) {
|
|
log_warning(_("error occurred on authentication\n"));
|
|
smtp_session->state = SMTP_ERROR;
|
|
smtp_session->error_val = SM_AUTHFAIL;
|
|
g_free(smtp_session->error_msg);
|
|
smtp_session->error_msg = g_strdup(msg);
|
|
return -1;
|
|
}
|
|
|
|
if (msg[0] != '1' && msg[0] != '2' && msg[0] != '3') {
|
|
log_warning(_("error occurred on SMTP session\n"));
|
|
smtp_session->state = SMTP_ERROR;
|
|
smtp_session->error_val = SM_ERROR;
|
|
g_free(smtp_session->error_msg);
|
|
smtp_session->error_msg = g_strdup(msg);
|
|
return -1;
|
|
}
|
|
|
|
if (msg[3] == '-')
|
|
cont = TRUE;
|
|
else if (msg[3] != ' ' && msg[3] != '\0') {
|
|
log_warning(_("bad SMTP response\n"));
|
|
smtp_session->state = SMTP_ERROR;
|
|
smtp_session->error_val = SM_UNRECOVERABLE;
|
|
return -1;
|
|
}
|
|
|
|
/* ignore all multiline responses except for EHLO */
|
|
if (cont && smtp_session->state != SMTP_EHLO)
|
|
return session_recv_msg(session);
|
|
|
|
switch (smtp_session->state) {
|
|
case SMTP_READY:
|
|
if (strstr(msg, "ESMTP"))
|
|
smtp_session->is_esmtp = TRUE;
|
|
case SMTP_CONNECTED:
|
|
#if USE_OPENSSL
|
|
if (smtp_session->user || session->ssl_type != SSL_NONE ||
|
|
smtp_session->is_esmtp)
|
|
#else
|
|
if (smtp_session->user || smtp_session->is_esmtp)
|
|
#endif
|
|
smtp_ehlo(smtp_session);
|
|
else
|
|
smtp_helo(smtp_session);
|
|
break;
|
|
case SMTP_HELO:
|
|
smtp_from(smtp_session);
|
|
break;
|
|
case SMTP_EHLO:
|
|
smtp_ehlo_recv(smtp_session, msg);
|
|
if (cont == TRUE)
|
|
break;
|
|
if (smtp_session->max_message_size > 0
|
|
&& smtp_session->max_message_size <
|
|
smtp_session->send_data_len) {
|
|
log_warning(_("Message is too big "
|
|
"(Maximum size is %s)\n"),
|
|
to_human_readable(
|
|
(off_t)(smtp_session->max_message_size)));
|
|
smtp_session->state = SMTP_ERROR;
|
|
smtp_session->error_val = SM_ERROR;
|
|
return -1;
|
|
}
|
|
#if USE_OPENSSL
|
|
if (session->ssl_type == SSL_STARTTLS &&
|
|
smtp_session->tls_init_done == FALSE) {
|
|
smtp_starttls(smtp_session);
|
|
break;
|
|
}
|
|
#endif
|
|
if (smtp_session->user) {
|
|
if (smtp_auth(smtp_session) != SM_OK) {
|
|
#if USE_OPENSSL
|
|
if (session->ssl_type == SSL_NONE
|
|
&& smtp_session->tls_init_done == FALSE
|
|
&& (smtp_session->avail_auth_type & SMTPAUTH_TLS_AVAILABLE))
|
|
smtp_starttls(smtp_session);
|
|
else
|
|
#endif
|
|
smtp_from(smtp_session);
|
|
}
|
|
} else
|
|
smtp_from(smtp_session);
|
|
break;
|
|
case SMTP_STARTTLS:
|
|
#if USE_OPENSSL
|
|
if (session_start_tls(session) < 0) {
|
|
log_warning(_("can't start TLS session\n"));
|
|
smtp_session->state = SMTP_ERROR;
|
|
smtp_session->error_val = SM_ERROR;
|
|
return -1;
|
|
}
|
|
smtp_session->tls_init_done = TRUE;
|
|
smtp_ehlo(smtp_session);
|
|
#endif
|
|
break;
|
|
case SMTP_AUTH:
|
|
smtp_auth_recv(smtp_session, msg);
|
|
break;
|
|
case SMTP_AUTH_LOGIN_USER:
|
|
smtp_auth_login_user_recv(smtp_session, msg);
|
|
break;
|
|
case SMTP_AUTH_PLAIN:
|
|
case SMTP_AUTH_LOGIN_PASS:
|
|
case SMTP_AUTH_CRAM_MD5:
|
|
smtp_from(smtp_session);
|
|
break;
|
|
case SMTP_FROM:
|
|
if (smtp_session->cur_to)
|
|
smtp_rcpt(smtp_session);
|
|
break;
|
|
case SMTP_RCPT:
|
|
if (smtp_session->cur_to)
|
|
smtp_rcpt(smtp_session);
|
|
else
|
|
smtp_data(smtp_session);
|
|
break;
|
|
case SMTP_DATA:
|
|
smtp_send_data(smtp_session);
|
|
break;
|
|
case SMTP_EOM:
|
|
smtp_make_ready(smtp_session);
|
|
break;
|
|
case SMTP_QUIT:
|
|
session_disconnect(session);
|
|
break;
|
|
case SMTP_ERROR:
|
|
default:
|
|
log_warning(_("error occurred on SMTP session\n"));
|
|
smtp_session->error_val = SM_ERROR;
|
|
return -1;
|
|
}
|
|
|
|
if (cont)
|
|
return session_recv_msg(session);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static gint smtp_session_send_data_finished(Session *session, guint len)
|
|
{
|
|
smtp_eom(SMTP_SESSION(session));
|
|
return 0;
|
|
}
|