2 * Copyright (c) 2008 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthias Schmidt <matthias@dragonflybsd.org>, University of Marburg,
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
18 * 3. Neither the name of The DragonFly Project nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific, prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 #include <sys/param.h>
39 #include <sys/queue.h>
41 #include <sys/types.h>
42 #include <sys/socket.h>
43 #include <netinet/in.h>
44 #include <arpa/inet.h>
46 #include <openssl/ssl.h>
47 #include <openssl/err.h>
60 char neterr[ERRMSG_SIZE];
68 while ((nerr = ERR_get_error()) != 0)
71 return (ERR_error_string(oerr, NULL));
75 send_remote_command(int fd, const char* fmt, ...)
84 s = vsnprintf(cmd, sizeof(cmd) - 2, fmt, va);
86 if (s == sizeof(cmd) - 2 || s < 0) {
87 strcpy(neterr, "Internal error: oversized command string");
91 /* We *know* there are at least two more bytes available */
95 if (((config.features & SECURETRANS) != 0) &&
96 ((config.features & NOSSL) == 0)) {
97 while ((s = SSL_write(config.ssl, (const char*)cmd, len)) <= 0) {
98 s = SSL_get_error(config.ssl, s);
99 if (s != SSL_ERROR_WANT_READ &&
100 s != SSL_ERROR_WANT_WRITE) {
101 strncpy(neterr, ssl_errstr(), sizeof(neterr));
109 n = write(fd, cmd + pos, len - pos);
120 read_remote(int fd, int extbufsize, char *extbuf)
123 size_t pos, len, copysize;
125 int done = 0, status = 0, status_running = 0, extbufpos = 0;
126 enum { parse_status, parse_spacedash, parse_rest } parsestate;
128 if (do_timeout(CON_TIMEOUT, 1) != 0) {
129 snprintf(neterr, sizeof(neterr), "Timeout reached");
134 * Remote reading code from femail.c written by Henning Brauer of
135 * OpenBSD and released under a BSD style license.
139 parsestate = parse_status;
141 while (!(done && parsestate == parse_status)) {
144 (pos > 0 && memchr(buff + pos, '\n', len - pos) == NULL)) {
145 memmove(buff, buff + pos, len - pos);
148 if (((config.features & SECURETRANS) != 0) &&
149 (config.features & NOSSL) == 0) {
150 if ((rlen = SSL_read(config.ssl, buff + len, sizeof(buff) - len)) == -1) {
151 strncpy(neterr, ssl_errstr(), sizeof(neterr));
155 if ((rlen = read(fd, buff + len, sizeof(buff) - len)) == -1) {
156 strncpy(neterr, strerror(errno), sizeof(neterr));
162 copysize = sizeof(neterr) - strlen(neterr) - 1;
165 strncat(neterr, buff, copysize);
168 * If there is an external buffer with a size bigger than zero
169 * and as long as there is space in the external buffer and
170 * there are new characters read from the mailserver
171 * copy them to the external buffer
173 if (extbufpos <= (extbufsize - 1) && rlen > 0 && extbufsize > 0 && extbuf != NULL) {
174 /* do not write over the bounds of the buffer */
175 if(extbufpos + rlen > (extbufsize - 1)) {
176 rlen = extbufsize - extbufpos;
178 memcpy(extbuf + extbufpos, buff + len - rlen, rlen);
185 switch (parsestate) {
187 for (; pos < len; pos++) {
188 if (isdigit(buff[pos])) {
189 status_running = status_running * 10 + (buff[pos] - '0');
191 status = status_running;
193 parsestate = parse_spacedash;
199 case parse_spacedash:
207 /* XXX read capabilities */
211 strcpy(neterr, "invalid syntax in reply from server");
216 parsestate = parse_rest;
221 for (; pos < len; pos++) {
222 if (buff[pos] == '\n') {
224 parsestate = parse_status;
234 /* chop off trailing newlines */
235 while (neterr[0] != 0 && strchr("\r\n", neterr[strlen(neterr) - 1]) != 0)
236 neterr[strlen(neterr) - 1] = 0;
246 * Handle SMTP authentication
249 smtp_login(int fd, char *login, char* password)
254 res = smtp_auth_md5(fd, login, password);
257 } else if (res == -2) {
259 * If the return code is -2, then then the login attempt failed,
260 * do not try other login mechanisms
265 if ((config.features & INSECURE) != 0 ||
266 (config.features & SECURETRANS) != 0) {
267 /* Send AUTH command according to RFC 2554 */
268 send_remote_command(fd, "AUTH LOGIN");
269 if (read_remote(fd, 0, NULL) != 3) {
270 syslog(LOG_NOTICE, "remote delivery deferred:"
271 " AUTH login not available: %s",
276 len = base64_encode(login, strlen(login), &temp);
279 syslog(LOG_ERR, "can not encode auth reply: %m");
283 send_remote_command(fd, "%s", temp);
285 res = read_remote(fd, 0, NULL);
287 syslog(LOG_NOTICE, "remote delivery %s: AUTH login failed: %s",
288 res == 5 ? "failed" : "deferred", neterr);
289 return (res == 5 ? -1 : 1);
292 len = base64_encode(password, strlen(password), &temp);
296 send_remote_command(fd, "%s", temp);
298 res = read_remote(fd, 0, NULL);
300 syslog(LOG_NOTICE, "remote delivery %s: Authentication failed: %s",
301 res == 5 ? "failed" : "deferred", neterr);
302 return (res == 5 ? -1 : 1);
305 syslog(LOG_WARNING, "non-encrypted SMTP login is disabled in config, so skipping it. ");
313 open_connection(struct mx_hostentry *h)
317 syslog(LOG_INFO, "trying remote delivery to %s [%s] pref %d",
318 h->host, h->addr, h->pref);
320 fd = socket(h->ai.ai_family, h->ai.ai_socktype, h->ai.ai_protocol);
322 syslog(LOG_INFO, "socket for %s [%s] failed: %m",
327 if (connect(fd, (struct sockaddr *)&h->sa, h->ai.ai_addrlen) < 0) {
328 syslog(LOG_INFO, "connect to %s [%s] failed: %m",
338 close_connection(int fd)
340 if (config.ssl != NULL) {
341 if (((config.features & SECURETRANS) != 0) &&
342 ((config.features & NOSSL) == 0))
343 SSL_shutdown(config.ssl);
344 SSL_free(config.ssl);
351 deliver_to_host(struct qitem *it, struct mx_hostentry *host)
356 int fd, error = 0, do_auth = 0, res = 0;
358 if (fseek(it->mailf, 0, SEEK_SET) != 0) {
359 snprintf(errmsg, sizeof(errmsg), "can not seek: %s", strerror(errno));
363 fd = open_connection(host);
367 #define READ_REMOTE_CHECK(c, exp) \
368 res = read_remote(fd, 0, NULL); \
370 syslog(LOG_ERR, "remote delivery to %s [%s] failed after %s: %s", \
371 host->host, host->addr, c, neterr); \
372 snprintf(errmsg, sizeof(errmsg), "%s [%s] did not like our %s:\n%s", \
373 host->host, host->addr, c, neterr); \
375 } else if (res != exp) { \
376 syslog(LOG_NOTICE, "remote delivery deferred: %s [%s] failed after %s: %s", \
377 host->host, host->addr, c, neterr); \
381 /* Check first reply from remote host */
382 if ((config.features & SECURETRANS) == 0 ||
383 (config.features & STARTTLS) != 0) {
384 config.features |= NOSSL;
385 READ_REMOTE_CHECK("connect", 2);
387 config.features &= ~NOSSL;
390 if ((config.features & SECURETRANS) != 0) {
391 error = smtp_init_crypto(fd, config.features);
393 syslog(LOG_DEBUG, "SSL initialization successful");
397 if ((config.features & STARTTLS) == 0)
398 READ_REMOTE_CHECK("connect", 2);
401 /* XXX allow HELO fallback */
402 /* XXX record ESMTP keywords */
403 send_remote_command(fd, "EHLO %s", hostname());
404 READ_REMOTE_CHECK("EHLO", 2);
407 * Use SMTP authentication if the user defined an entry for the remote
410 SLIST_FOREACH(a, &authusers, next) {
411 if (strcmp(a->host, host->host) == 0) {
419 * Check if the user wants plain text login without using
422 syslog(LOG_INFO, "using SMTP authentication for user %s", a->login);
423 error = smtp_login(fd, a->login, a->password);
425 syslog(LOG_ERR, "remote delivery failed:"
426 " SMTP login failed: %m");
427 snprintf(errmsg, sizeof(errmsg), "SMTP login to %s failed", host->host);
430 /* SMTP login is not available, so try without */
431 else if (error > 0) {
432 syslog(LOG_WARNING, "SMTP login not available. Trying without.");
436 /* XXX send ESMTP ENVID, RET (FULL/HDRS) and 8BITMIME */
437 send_remote_command(fd, "MAIL FROM:<%s>", it->sender);
438 READ_REMOTE_CHECK("MAIL FROM", 2);
440 /* XXX send ESMTP ORCPT */
441 send_remote_command(fd, "RCPT TO:<%s>", it->addr);
442 READ_REMOTE_CHECK("RCPT TO", 2);
444 send_remote_command(fd, "DATA");
445 READ_REMOTE_CHECK("DATA", 3);
448 while (!feof(it->mailf)) {
449 if (fgets(line, sizeof(line), it->mailf) == NULL)
451 linelen = strlen(line);
452 if (linelen == 0 || line[linelen - 1] != '\n') {
453 syslog(LOG_CRIT, "remote delivery failed: corrupted queue file");
454 snprintf(errmsg, sizeof(errmsg), "corrupted queue file");
459 /* Remove trailing \n's and escape leading dots */
463 * If the first character is a dot, we escape it so the line
469 if (send_remote_command(fd, "%s", line) != (ssize_t)linelen+1) {
470 syslog(LOG_NOTICE, "remote delivery deferred: write error");
476 send_remote_command(fd, ".");
477 READ_REMOTE_CHECK("final DATA", 2);
479 send_remote_command(fd, "QUIT");
480 if (read_remote(fd, 0, NULL) != 2)
481 syslog(LOG_INFO, "remote delivery succeeded but QUIT failed: %s", neterr);
484 close_connection(fd);
489 deliver_remote(struct qitem *it)
491 struct mx_hostentry *hosts, *h;
494 int error = 1, smarthost = 0;
496 host = strrchr(it->addr, '@');
497 /* Should not happen */
499 snprintf(errmsg, sizeof(errmsg), "Internal error: badly formed address %s",
503 /* Step over the @ */
509 /* Smarthost support? */
510 if (config.smarthost != NULL) {
511 host = config.smarthost;
513 syslog(LOG_INFO, "using smarthost (%s:%i)", host, port);
517 error = dns_get_mx_list(host, port, &hosts, smarthost);
519 syslog(LOG_NOTICE, "remote delivery %s: DNS failure (%s)",
520 error < 0 ? "failed" : "deferred",
525 for (h = hosts; *h->host != 0; h++) {
526 switch (deliver_to_host(it, h)) {