dma: provide proper bounce error message
[dragonfly.git] / libexec / dma / net.c
CommitLineData
f67beddd
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1/*
2 * Copyright (c) 2008 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthias Schmidt <matthias@dragonflybsd.org>, University of Marburg,
6 * Germany.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
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
17 * distribution.
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.
21 *
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
33 * SUCH DAMAGE.
34 *
bc7baf1d 35 * $DragonFly: src/libexec/dma/net.c,v 1.9 2008/09/30 17:47:21 swildner Exp $
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36 */
37
38#include <sys/param.h>
39#include <sys/queue.h>
40#include <sys/stat.h>
41#include <sys/types.h>
42#include <sys/socket.h>
43#include <netinet/in.h>
44#include <arpa/inet.h>
45
46#ifdef HAVE_CRYPTO
47#include <openssl/ssl.h>
48#endif /* HAVE_CRYPTO */
49
bc7baf1d 50#include <err.h>
a5a8a1a4 51#include <errno.h>
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52#include <netdb.h>
53#include <setjmp.h>
54#include <signal.h>
55#include <syslog.h>
56#include <unistd.h>
57
58#include "dma.h"
59
60extern struct config *config;
61extern struct authusers authusers;
62static jmp_buf timeout_alarm;
a5a8a1a4 63char neterr[BUF_SIZE];
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64
65static void
dba19026 66sig_alarm(int signo __unused)
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67{
68 longjmp(timeout_alarm, 1);
69}
70
71ssize_t
72send_remote_command(int fd, const char* fmt, ...)
73{
74 va_list va;
75 char cmd[4096];
2922fd2b
SS
76 size_t len, pos;
77 int s;
78 ssize_t n;
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79
80 va_start(va, fmt);
2922fd2b
SS
81 s = vsnprintf(cmd, sizeof(cmd) - 2, fmt, va);
82 va_end(va);
83 if (s == sizeof(cmd) - 2 || s < 0)
84 errx(1, "Internal error: oversized command string");
85 /* We *know* there are at least two more bytes available */
86 strcat(cmd, "\r\n");
87 len = strlen(cmd);
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88
89 if (((config->features & SECURETRANS) != 0) &&
6ef9fe01 90 ((config->features & NOSSL) == 0)) {
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SS
91 while ((s = SSL_write(config->ssl, (const char*)cmd, len)) <= 0) {
92 s = SSL_get_error(config->ssl, s);
93 if (s != SSL_ERROR_WANT_READ &&
94 s != SSL_ERROR_WANT_WRITE)
95 return (-1);
96 }
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97 }
98 else {
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99 pos = 0;
100 while (pos < len) {
101 n = write(fd, cmd + pos, len - pos);
102 if (n < 0)
103 return (-1);
104 pos += n;
105 }
f67beddd 106 }
f67beddd 107
2922fd2b 108 return (len);
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109}
110
6ef9fe01 111int
7b68d8ae 112read_remote(int fd, int extbufsize, char *extbuf)
f67beddd 113{
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114 ssize_t rlen = 0;
115 size_t pos, len;
116 char buff[BUF_SIZE];
7b68d8ae 117 int done = 0, status = 0, extbufpos = 0;
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118
119 if (signal(SIGALRM, sig_alarm) == SIG_ERR) {
a5a8a1a4
SS
120 snprintf(neterr, sizeof(neterr), "SIGALRM error: %s",
121 strerror(errno));
122 return (1);
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123 }
124 if (setjmp(timeout_alarm) != 0) {
a5a8a1a4 125 snprintf(neterr, sizeof(neterr), "Timeout reached");
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126 return (1);
127 }
128 alarm(CON_TIMEOUT);
129
130 /*
6ef9fe01
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131 * Remote reading code from femail.c written by Henning Brauer of
132 * OpenBSD and released under a BSD style license.
f67beddd 133 */
6ef9fe01 134 for (len = pos = 0; !done; ) {
7b68d8ae 135 rlen = 0;
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MS
136 if (pos == 0 ||
137 (pos > 0 && memchr(buff + pos, '\n', len - pos) == NULL)) {
138 memmove(buff, buff + pos, len - pos);
139 len -= pos;
140 pos = 0;
141 if (((config->features & SECURETRANS) != 0) &&
142 (config->features & NOSSL) == 0) {
143 if ((rlen = SSL_read(config->ssl, buff + len,
144 sizeof(buff) - len)) == -1)
145 err(1, "read");
146 } else {
147 if ((rlen = read(fd, buff + len,
148 sizeof(buff) - len)) == -1)
149 err(1, "read");
150 }
151 len += rlen;
152 }
7b68d8ae
MS
153 /*
154 * If there is an external buffer with a size bigger than zero
155 * and as long as there is space in the external buffer and
156 * there are new characters read from the mailserver
157 * copy them to the external buffer
158 */
159 if (extbufpos <= (extbufsize - 1) && rlen && extbufsize > 0
160 && extbuf != NULL) {
161 /* do not write over the bounds of the buffer */
162 if(extbufpos + rlen > (extbufsize - 1)) {
163 rlen = extbufsize - extbufpos;
164 }
165 memcpy(extbuf + extbufpos, buff + len - rlen, rlen);
166 extbufpos += rlen;
167 }
6ef9fe01
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168 for (; pos < len && buff[pos] >= '0' && buff[pos] <= '9'; pos++)
169 ; /* Do nothing */
f67beddd 170
6ef9fe01
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171 if (pos == len)
172 return (0);
f67beddd 173
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174 if (buff[pos] == ' ')
175 done = 1;
176 else if (buff[pos] != '-')
177 syslog(LOG_ERR, "invalid syntax in reply from server");
f67beddd 178
6ef9fe01
MS
179 /* skip up to \n */
180 for (; pos < len && buff[pos - 1] != '\n'; pos++)
181 ; /* Do nothing */
f67beddd 182
f67beddd 183 }
6ef9fe01
MS
184 alarm(0);
185
a5a8a1a4
SS
186 buff[len] = '\0';
187 while (len > 0 && (buff[len - 1] == '\r' || buff[len - 1] == '\n'))
188 buff[--len] = '\0';
189 snprintf(neterr, sizeof(neterr), "%s", buff);
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190 status = atoi(buff);
191 return (status/100);
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192}
193
194/*
195 * Handle SMTP authentication
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196 */
197static int
198smtp_login(struct qitem *it, int fd, char *login, char* password)
199{
f67beddd 200 char *temp;
6ef9fe01 201 int len, res = 0;
f67beddd 202
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MS
203#ifdef HAVE_CRYPTO
204 res = smtp_auth_md5(it, fd, login, password);
205 if (res == 0) {
206 return (0);
207 } else if (res == -2) {
208 /*
209 * If the return code is -2, then then the login attempt failed,
210 * do not try other login mechanisms
211 */
212 return (-1);
f67beddd 213 }
7b68d8ae 214#endif /* HAVE_CRYPTO */
f67beddd 215
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MS
216 if ((config->features & INSECURE) != 0) {
217 /* Send AUTH command according to RFC 2554 */
218 send_remote_command(fd, "AUTH LOGIN");
219 if (read_remote(fd, 0, NULL) != 3) {
220 syslog(LOG_ERR, "%s: remote delivery deferred:"
a5a8a1a4
SS
221 " AUTH login not available: %s",
222 it->queueid, neterr);
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223 return (1);
224 }
f67beddd 225
7b68d8ae
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226 len = base64_encode(login, strlen(login), &temp);
227 if (len <= 0)
228 return (-1);
f67beddd 229
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230 send_remote_command(fd, "%s", temp);
231 if (read_remote(fd, 0, NULL) != 3) {
232 syslog(LOG_ERR, "%s: remote delivery deferred:"
a5a8a1a4
SS
233 " AUTH login failed: %s", it->queueid,
234 neterr);
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235 return (-1);
236 }
f67beddd 237
7b68d8ae
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238 len = base64_encode(password, strlen(password), &temp);
239 if (len <= 0)
240 return (-1);
241
242 send_remote_command(fd, "%s", temp);
243 res = read_remote(fd, 0, NULL);
244 if (res == 5) {
245 syslog(LOG_ERR, "%s: remote delivery failed:"
a5a8a1a4
SS
246 " Authentication failed: %s",
247 it->queueid, neterr);
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MS
248 return (-1);
249 } else if (res != 2) {
250 syslog(LOG_ERR, "%s: remote delivery failed:"
a5a8a1a4
SS
251 " AUTH password failed: %s",
252 it->queueid, neterr);
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253 return (-1);
254 }
255 } else {
256 syslog(LOG_ERR, "%s: non-encrypted SMTP login is disabled in config, so skipping it. ",
257 it->queueid);
258 return (1);
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259 }
260
261 return (0);
262}
263
264static int
265open_connection(struct qitem *it, const char *host)
266{
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267 struct addrinfo hints, *res, *res0;
268 char servname[128];
269 const char *errmsg = NULL;
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270 int fd, error = 0, port;
271
dba19026 272 if (config->port != 0)
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273 port = config->port;
274 else
275 port = SMTP_PORT;
276
7b68d8ae 277 /* FIXME get MX record of host */
f67beddd
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278 /* Shamelessly taken from getaddrinfo(3) */
279 memset(&hints, 0, sizeof(hints));
280 hints.ai_family = PF_UNSPEC;
281 hints.ai_socktype = SOCK_STREAM;
282 hints.ai_protocol = IPPROTO_TCP;
283
284 snprintf(servname, sizeof(servname), "%d", port);
285 error = getaddrinfo(host, servname, &hints, &res0);
286 if (error) {
287 syslog(LOG_ERR, "%s: remote delivery deferred: "
288 "%s: %m", it->queueid, gai_strerror(error));
289 return (-1);
290 }
291 fd = -1;
292 for (res = res0; res; res = res->ai_next) {
293 fd=socket(res->ai_family, res->ai_socktype, res->ai_protocol);
294 if (fd < 0) {
295 errmsg = "socket failed";
296 continue;
297 }
298 if (connect(fd, res->ai_addr, res->ai_addrlen) < 0) {
299 errmsg = "connect failed";
300 close(fd);
301 fd = -1;
302 continue;
303 }
304 break;
305 }
306 if (fd < 0) {
307 syslog(LOG_ERR, "%s: remote delivery deferred: %s (%s:%s)",
308 it->queueid, errmsg, host, servname);
309 freeaddrinfo(res0);
310 return (-1);
311 }
312 freeaddrinfo(res0);
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313 return (fd);
314}
315
316int
39f7c85a 317deliver_remote(struct qitem *it, char **errmsg)
f67beddd
MS
318{
319 struct authuser *a;
6ef9fe01
MS
320 char *host, line[1000];
321 int fd, error = 0, do_auth = 0, res = 0;
f67beddd
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322 size_t linelen;
323
324 host = strrchr(it->addr, '@');
325 /* Should not happen */
39f7c85a
SS
326 if (host == NULL) {
327 asprintf(errmsg, "Internal error: badly formed address %s",
328 it->addr);
f67beddd 329 return(-1);
39f7c85a 330 } else {
f67beddd
MS
331 /* Step over the @ */
332 host++;
39f7c85a 333 }
f67beddd
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334
335 /* Smarthost support? */
336 if (config->smarthost != NULL && strlen(config->smarthost) > 0) {
4a23bd3d
MS
337 syslog(LOG_INFO, "%s: using smarthost (%s:%i)",
338 it->queueid, config->smarthost, config->port);
f67beddd
MS
339 host = config->smarthost;
340 }
341
342 fd = open_connection(it, host);
343 if (fd < 0)
4a23bd3d 344 return (1);
f67beddd 345
6ef9fe01
MS
346 /* Check first reply from remote host */
347 config->features |= NOSSL;
7b68d8ae 348 res = read_remote(fd, 0, NULL);
6ef9fe01
MS
349 if (res != 2) {
350 syslog(LOG_INFO, "%s: Invalid initial response: %i",
351 it->queueid, res);
352 return(1);
353 }
354 config->features &= ~NOSSL;
355
f67beddd
MS
356#ifdef HAVE_CRYPTO
357 if ((config->features & SECURETRANS) != 0) {
358 error = smtp_init_crypto(it, fd, config->features);
359 if (error >= 0)
0ca0cd25 360 syslog(LOG_INFO, "%s: SSL initialization successful",
f67beddd
MS
361 it->queueid);
362 else
363 goto out;
364 }
365
366 /*
367 * If the user doesn't want STARTTLS, but SSL encryption, we
368 * have to enable SSL first, then send EHLO
369 */
370 if (((config->features & STARTTLS) == 0) &&
371 ((config->features & SECURETRANS) != 0)) {
372 send_remote_command(fd, "EHLO %s", hostname());
7b68d8ae 373 if (read_remote(fd, 0, NULL) != 2) {
f67beddd 374 syslog(LOG_ERR, "%s: remote delivery deferred: "
a5a8a1a4 375 " EHLO failed: %s", it->queueid, neterr);
39f7c85a
SS
376 asprintf(errmsg, "%s did not like our EHLO:\n%s",
377 host, neterr);
f67beddd
MS
378 return (-1);
379 }
380 }
381#endif /* HAVE_CRYPTO */
382 if (((config->features & SECURETRANS) == 0)) {
383 send_remote_command(fd, "EHLO %s", hostname());
7b68d8ae 384 if (read_remote(fd, 0, NULL) != 2) {
f67beddd 385 syslog(LOG_ERR, "%s: remote delivery deferred: "
a5a8a1a4 386 " EHLO failed: %s", it->queueid, neterr);
39f7c85a
SS
387 asprintf(errmsg, "%s did not like our EHLO:\n%s",
388 host, neterr);
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MS
389 return (-1);
390 }
391 }
392
393 /*
394 * Use SMTP authentication if the user defined an entry for the remote
395 * or smarthost
396 */
397 SLIST_FOREACH(a, &authusers, next) {
398 if (strcmp(a->host, host) == 0) {
399 do_auth = 1;
400 break;
401 }
402 }
403
404 if (do_auth == 1) {
b558d098
MS
405 /*
406 * Check if the user wants plain text login without using
407 * encryption.
408 */
7b68d8ae 409 syslog(LOG_INFO, "%s: Use SMTP authentication",
f67beddd 410 it->queueid);
7b68d8ae
MS
411 error = smtp_login(it, fd, a->login, a->password);
412 if (error < 0) {
413 syslog(LOG_ERR, "%s: remote delivery failed:"
b558d098 414 " SMTP login failed: %m", it->queueid);
39f7c85a 415 asprintf(errmsg, "SMTP login to %s failed", host);
4a23bd3d 416 return (-1);
b558d098 417 }
7b68d8ae
MS
418 /* SMTP login is not available, so try without */
419 else if (error > 0)
420 syslog(LOG_ERR, "%s: SMTP login not available."
421 " Try without", it->queueid);
f67beddd
MS
422 }
423
7dfd2fd8
SS
424#define READ_REMOTE_CHECK(c, exp) \
425 res = read_remote(fd, 0, NULL); \
426 if (res == 5) { \
427 syslog(LOG_ERR, "%s: remote delivery failed: " \
428 c " failed: %s", it->queueid, neterr); \
39f7c85a
SS
429 asprintf(errmsg, "%s did not like our " c ":\n%s", \
430 host, neterr); \
7dfd2fd8
SS
431 return (-1); \
432 } else if (res != exp) { \
433 syslog(LOG_ERR, "%s: remote delivery deferred: " \
434 c " failed: %s", it->queueid, neterr); \
435 return (1); \
f67beddd
MS
436 }
437
7dfd2fd8
SS
438 send_remote_command(fd, "MAIL FROM:<%s>", it->sender);
439 READ_REMOTE_CHECK("MAIL FROM", 2);
440
4a23bd3d 441 send_remote_command(fd, "RCPT TO:<%s>", it->addr);
7dfd2fd8 442 READ_REMOTE_CHECK("RCPT TO", 2);
f67beddd
MS
443
444 send_remote_command(fd, "DATA");
7dfd2fd8 445 READ_REMOTE_CHECK("DATA", 3);
f67beddd
MS
446
447 if (fseek(it->queuef, it->hdrlen, SEEK_SET) != 0) {
a5a8a1a4
SS
448 syslog(LOG_ERR, "%s: remote delivery deferred: cannot seek: %s",
449 it->queueid, neterr);
f67beddd
MS
450 return (1);
451 }
452
453 while (!feof(it->queuef)) {
454 if (fgets(line, sizeof(line), it->queuef) == NULL)
455 break;
456 linelen = strlen(line);
457 if (linelen == 0 || line[linelen - 1] != '\n') {
458 syslog(LOG_CRIT, "%s: remote delivery failed:"
459 "corrupted queue file", it->queueid);
39f7c85a 460 *errmsg = strdup("corrupted queue file");
f67beddd
MS
461 error = -1;
462 goto out;
463 }
464
465 /* Remove trailing \n's and escape leading dots */
466 trim_line(line);
467
468 /*
469 * If the first character is a dot, we escape it so the line
470 * length increases
471 */
472 if (line[0] == '.')
473 linelen++;
474
475 if (send_remote_command(fd, "%s", line) != (ssize_t)linelen+1) {
476 syslog(LOG_ERR, "%s: remote delivery deferred: "
477 "write error", it->queueid);
478 error = 1;
479 goto out;
480 }
481 }
482
483 send_remote_command(fd, ".");
7dfd2fd8 484 READ_REMOTE_CHECK("final DATA", 2);
f67beddd
MS
485
486 send_remote_command(fd, "QUIT");
6cfc247d
SS
487 if (read_remote(fd, 0, NULL) != 2)
488 syslog(LOG_WARNING, "%s: remote delivery succeeded but "
a5a8a1a4 489 "QUIT failed: %s", it->queueid, neterr);
f67beddd
MS
490out:
491
492 close(fd);
493 return (error);
494}
495