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
36 #include <sys/param.h>
37 #include <sys/queue.h>
39 #include <sys/types.h>
40 #include <sys/socket.h>
41 #include <netinet/in.h>
42 #include <arpa/inet.h>
44 #include <openssl/ssl.h>
45 #include <openssl/err.h>
57 static jmp_buf timeout_alarm
;
58 char neterr
[BUF_SIZE
];
66 while ((nerr
= ERR_get_error()) != 0)
69 return (ERR_error_string(oerr
, NULL
));
75 (void)signo
; /* so that gcc doesn't complain */
76 longjmp(timeout_alarm
, 1);
80 send_remote_command(int fd
, const char* fmt
, ...)
89 s
= vsnprintf(cmd
, sizeof(cmd
) - 2, fmt
, va
);
91 if (s
== sizeof(cmd
) - 2 || s
< 0) {
92 strcpy(neterr
, "Internal error: oversized command string");
96 /* We *know* there are at least two more bytes available */
100 if (((config
.features
& SECURETRANS
) != 0) &&
101 ((config
.features
& NOSSL
) == 0)) {
102 while ((s
= SSL_write(config
.ssl
, (const char*)cmd
, len
)) <= 0) {
103 s
= SSL_get_error(config
.ssl
, s
);
104 if (s
!= SSL_ERROR_WANT_READ
&&
105 s
!= SSL_ERROR_WANT_WRITE
) {
106 strncpy(neterr
, ssl_errstr(), sizeof(neterr
));
114 n
= write(fd
, cmd
+ pos
, len
- pos
);
125 read_remote(int fd
, int extbufsize
, char *extbuf
)
130 int done
= 0, status
= 0, extbufpos
= 0;
132 if (signal(SIGALRM
, sig_alarm
) == SIG_ERR
) {
133 snprintf(neterr
, sizeof(neterr
), "SIGALRM error: %s",
137 if (setjmp(timeout_alarm
) != 0) {
138 snprintf(neterr
, sizeof(neterr
), "Timeout reached");
144 * Remote reading code from femail.c written by Henning Brauer of
145 * OpenBSD and released under a BSD style license.
147 for (len
= pos
= 0; !done
; ) {
150 (pos
> 0 && memchr(buff
+ pos
, '\n', len
- pos
) == NULL
)) {
151 memmove(buff
, buff
+ pos
, len
- pos
);
154 if (((config
.features
& SECURETRANS
) != 0) &&
155 (config
.features
& NOSSL
) == 0) {
156 if ((rlen
= SSL_read(config
.ssl
, buff
+ len
,
157 sizeof(buff
) - len
)) == -1) {
158 strncpy(neterr
, ssl_errstr(), sizeof(neterr
));
162 if ((rlen
= read(fd
, buff
+ len
, sizeof(buff
) - len
)) == -1) {
163 strncpy(neterr
, strerror(errno
), sizeof(neterr
));
170 * If there is an external buffer with a size bigger than zero
171 * and as long as there is space in the external buffer and
172 * there are new characters read from the mailserver
173 * copy them to the external buffer
175 if (extbufpos
<= (extbufsize
- 1) && rlen
&& extbufsize
> 0
177 /* do not write over the bounds of the buffer */
178 if(extbufpos
+ rlen
> (extbufsize
- 1)) {
179 rlen
= extbufsize
- extbufpos
;
181 memcpy(extbuf
+ extbufpos
, buff
+ len
- rlen
, rlen
);
184 for (; pos
< len
&& buff
[pos
] >= '0' && buff
[pos
] <= '9'; pos
++)
190 if (buff
[pos
] == ' ') {
192 } else if (buff
[pos
] != '-') {
193 strcpy(neterr
, "invalid syntax in reply from server");
198 for (; pos
< len
&& buff
[pos
- 1] != '\n'; pos
++)
205 while (len
> 0 && (buff
[len
- 1] == '\r' || buff
[len
- 1] == '\n'))
207 snprintf(neterr
, sizeof(neterr
), "%s", buff
);
213 * Handle SMTP authentication
216 smtp_login(int fd
, char *login
, char* password
)
221 res
= smtp_auth_md5(fd
, login
, password
);
224 } else if (res
== -2) {
226 * If the return code is -2, then then the login attempt failed,
227 * do not try other login mechanisms
232 if ((config
.features
& INSECURE
) != 0 ||
233 (config
.features
& SECURETRANS
) != 0) {
234 /* Send AUTH command according to RFC 2554 */
235 send_remote_command(fd
, "AUTH LOGIN");
236 if (read_remote(fd
, 0, NULL
) != 3) {
237 syslog(LOG_NOTICE
, "remote delivery deferred:"
238 " AUTH login not available: %s",
243 len
= base64_encode(login
, strlen(login
), &temp
);
246 syslog(LOG_ERR
, "can not encode auth reply: %m");
250 send_remote_command(fd
, "%s", temp
);
252 res
= read_remote(fd
, 0, NULL
);
254 syslog(LOG_NOTICE
, "remote delivery %s: AUTH login failed: %s",
255 res
== 5 ? "failed" : "deferred", neterr
);
256 return (res
== 5 ? -1 : 1);
259 len
= base64_encode(password
, strlen(password
), &temp
);
263 send_remote_command(fd
, "%s", temp
);
265 res
= read_remote(fd
, 0, NULL
);
267 syslog(LOG_NOTICE
, "remote delivery %s: Authentication failed: %s",
268 res
== 5 ? "failed" : "deferred", neterr
);
269 return (res
== 5 ? -1 : 1);
272 syslog(LOG_WARNING
, "non-encrypted SMTP login is disabled in config, so skipping it. ");
280 open_connection(struct mx_hostentry
*h
)
284 syslog(LOG_INFO
, "trying remote delivery to %s [%s] pref %d",
285 h
->host
, h
->addr
, h
->pref
);
287 fd
= socket(h
->ai
.ai_family
, h
->ai
.ai_socktype
, h
->ai
.ai_protocol
);
289 syslog(LOG_INFO
, "socket for %s [%s] failed: %m",
294 if (connect(fd
, (struct sockaddr
*)&h
->sa
, h
->ai
.ai_addrlen
) < 0) {
295 syslog(LOG_INFO
, "connect to %s [%s] failed: %m",
305 close_connection(int fd
)
307 if (((config
.features
& SECURETRANS
) != 0) &&
308 ((config
.features
& NOSSL
) == 0))
309 SSL_shutdown(config
.ssl
);
311 if (config
.ssl
!= NULL
)
312 SSL_free(config
.ssl
);
318 deliver_to_host(struct qitem
*it
, struct mx_hostentry
*host
, void *errmsgc
)
323 int fd
, error
= 0, do_auth
= 0, res
= 0;
325 if (fseek(it
->mailf
, 0, SEEK_SET
) != 0) {
326 asprintf(errmsgc
, "can not seek: %s", strerror(errno
));
330 fd
= open_connection(host
);
334 #define READ_REMOTE_CHECK(c, exp) \
335 res = read_remote(fd, 0, NULL); \
337 syslog(LOG_ERR, "remote delivery to %s [%s] failed after %s: %s", \
338 host->host, host->addr, c, neterr); \
339 asprintf(errmsgc, "%s [%s] did not like our %s:\n%s", \
340 host->host, host->addr, c, neterr); \
342 } else if (res != exp) { \
343 syslog(LOG_NOTICE, "remote delivery deferred: %s [%s] failed after %s: %s", \
344 host->host, host->addr, c, neterr); \
348 /* Check first reply from remote host */
349 config
.features
|= NOSSL
;
350 READ_REMOTE_CHECK("connect", 2);
352 config
.features
&= ~NOSSL
;
354 if ((config
.features
& SECURETRANS
) != 0) {
355 error
= smtp_init_crypto(fd
, config
.features
);
357 syslog(LOG_DEBUG
, "SSL initialization successful");
362 /* XXX allow HELO fallback */
363 /* XXX record ESMTP keywords */
364 send_remote_command(fd
, "EHLO %s", hostname());
365 READ_REMOTE_CHECK("EHLO", 2);
368 * Use SMTP authentication if the user defined an entry for the remote
371 SLIST_FOREACH(a
, &authusers
, next
) {
372 if (strcmp(a
->host
, host
->host
) == 0) {
380 * Check if the user wants plain text login without using
383 syslog(LOG_INFO
, "using SMTP authentication for user %s", a
->login
);
384 error
= smtp_login(fd
, a
->login
, a
->password
);
386 syslog(LOG_ERR
, "remote delivery failed:"
387 " SMTP login failed: %m");
388 asprintf(errmsgc
, "SMTP login to %s failed", host
->host
);
391 /* SMTP login is not available, so try without */
392 else if (error
> 0) {
393 syslog(LOG_WARNING
, "SMTP login not available. Trying without.");
397 /* XXX send ESMTP ENVID, RET (FULL/HDRS) and 8BITMIME */
398 send_remote_command(fd
, "MAIL FROM:<%s>", it
->sender
);
399 READ_REMOTE_CHECK("MAIL FROM", 2);
401 /* XXX send ESMTP ORCPT */
402 send_remote_command(fd
, "RCPT TO:<%s>", it
->addr
);
403 READ_REMOTE_CHECK("RCPT TO", 2);
405 send_remote_command(fd
, "DATA");
406 READ_REMOTE_CHECK("DATA", 3);
409 while (!feof(it
->mailf
)) {
410 if (fgets(line
, sizeof(line
), it
->mailf
) == NULL
)
412 linelen
= strlen(line
);
413 if (linelen
== 0 || line
[linelen
- 1] != '\n') {
414 syslog(LOG_CRIT
, "remote delivery failed: corrupted queue file");
415 *(const char **)errmsgc
= "corrupted queue file";
420 /* Remove trailing \n's and escape leading dots */
424 * If the first character is a dot, we escape it so the line
430 if (send_remote_command(fd
, "%s", line
) != (ssize_t
)linelen
+1) {
431 syslog(LOG_NOTICE
, "remote delivery deferred: write error");
437 send_remote_command(fd
, ".");
438 READ_REMOTE_CHECK("final DATA", 2);
440 send_remote_command(fd
, "QUIT");
441 if (read_remote(fd
, 0, NULL
) != 2)
442 syslog(LOG_INFO
, "remote delivery succeeded but QUIT failed: %s", neterr
);
445 close_connection(fd
);
450 deliver_remote(struct qitem
*it
, const char **errmsg
)
452 /* asprintf can't take const */
453 void *errmsgc
= __DECONST(char **, errmsg
);
454 struct mx_hostentry
*hosts
, *h
;
457 int error
= 1, smarthost
= 0;
459 host
= strrchr(it
->addr
, '@');
460 /* Should not happen */
462 asprintf(errmsgc
, "Internal error: badly formed address %s",
466 /* Step over the @ */
472 /* Smarthost support? */
473 if (config
.smarthost
!= NULL
) {
474 host
= config
.smarthost
;
476 syslog(LOG_INFO
, "using smarthost (%s:%i)", host
, port
);
480 error
= dns_get_mx_list(host
, port
, &hosts
, smarthost
);
482 syslog(LOG_NOTICE
, "remote delivery %s: DNS failure (%s)",
483 error
< 0 ? "failed" : "deferred",
488 for (h
= hosts
; *h
->host
!= 0; h
++) {
489 switch (deliver_to_host(it
, h
, errmsgc
)) {