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[dragonfly.git] / libexec / dma / net.c
CommitLineData
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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>
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51#include <netdb.h>
52#include <setjmp.h>
53#include <signal.h>
54#include <syslog.h>
55#include <unistd.h>
56
57#include "dma.h"
58
59extern struct config *config;
60extern struct authusers authusers;
61static jmp_buf timeout_alarm;
62
63static void
dba19026 64sig_alarm(int signo __unused)
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65{
66 longjmp(timeout_alarm, 1);
67}
68
69ssize_t
70send_remote_command(int fd, const char* fmt, ...)
71{
72 va_list va;
73 char cmd[4096];
74 ssize_t len = 0;
75
76 va_start(va, fmt);
77 vsprintf(cmd, fmt, va);
78
79 if (((config->features & SECURETRANS) != 0) &&
6ef9fe01 80 ((config->features & NOSSL) == 0)) {
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81 len = SSL_write(config->ssl, (const char*)cmd, strlen(cmd));
82 SSL_write(config->ssl, "\r\n", 2);
83 }
84 else {
85 len = write(fd, cmd, strlen(cmd));
86 write(fd, "\r\n", 2);
87 }
88 va_end(va);
89
90 return (len+2);
91}
92
6ef9fe01 93int
7b68d8ae 94read_remote(int fd, int extbufsize, char *extbuf)
f67beddd 95{
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96 ssize_t rlen = 0;
97 size_t pos, len;
98 char buff[BUF_SIZE];
7b68d8ae 99 int done = 0, status = 0, extbufpos = 0;
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100
101 if (signal(SIGALRM, sig_alarm) == SIG_ERR) {
102 syslog(LOG_ERR, "SIGALRM error: %m");
103 }
104 if (setjmp(timeout_alarm) != 0) {
105 syslog(LOG_ERR, "Timeout reached");
106 return (1);
107 }
108 alarm(CON_TIMEOUT);
109
110 /*
6ef9fe01
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111 * Remote reading code from femail.c written by Henning Brauer of
112 * OpenBSD and released under a BSD style license.
f67beddd 113 */
6ef9fe01 114 for (len = pos = 0; !done; ) {
7b68d8ae 115 rlen = 0;
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116 if (pos == 0 ||
117 (pos > 0 && memchr(buff + pos, '\n', len - pos) == NULL)) {
118 memmove(buff, buff + pos, len - pos);
119 len -= pos;
120 pos = 0;
121 if (((config->features & SECURETRANS) != 0) &&
122 (config->features & NOSSL) == 0) {
123 if ((rlen = SSL_read(config->ssl, buff + len,
124 sizeof(buff) - len)) == -1)
125 err(1, "read");
126 } else {
127 if ((rlen = read(fd, buff + len,
128 sizeof(buff) - len)) == -1)
129 err(1, "read");
130 }
131 len += rlen;
132 }
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133 /*
134 * If there is an external buffer with a size bigger than zero
135 * and as long as there is space in the external buffer and
136 * there are new characters read from the mailserver
137 * copy them to the external buffer
138 */
139 if (extbufpos <= (extbufsize - 1) && rlen && extbufsize > 0
140 && extbuf != NULL) {
141 /* do not write over the bounds of the buffer */
142 if(extbufpos + rlen > (extbufsize - 1)) {
143 rlen = extbufsize - extbufpos;
144 }
145 memcpy(extbuf + extbufpos, buff + len - rlen, rlen);
146 extbufpos += rlen;
147 }
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148 for (; pos < len && buff[pos] >= '0' && buff[pos] <= '9'; pos++)
149 ; /* Do nothing */
f67beddd 150
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151 if (pos == len)
152 return (0);
f67beddd 153
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154 if (buff[pos] == ' ')
155 done = 1;
156 else if (buff[pos] != '-')
157 syslog(LOG_ERR, "invalid syntax in reply from server");
f67beddd 158
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159 /* skip up to \n */
160 for (; pos < len && buff[pos - 1] != '\n'; pos++)
161 ; /* Do nothing */
f67beddd 162
f67beddd 163 }
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164 alarm(0);
165
166 status = atoi(buff);
167 return (status/100);
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168}
169
170/*
171 * Handle SMTP authentication
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172 */
173static int
174smtp_login(struct qitem *it, int fd, char *login, char* password)
175{
f67beddd 176 char *temp;
6ef9fe01 177 int len, res = 0;
f67beddd 178
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179#ifdef HAVE_CRYPTO
180 res = smtp_auth_md5(it, fd, login, password);
181 if (res == 0) {
182 return (0);
183 } else if (res == -2) {
184 /*
185 * If the return code is -2, then then the login attempt failed,
186 * do not try other login mechanisms
187 */
188 return (-1);
f67beddd 189 }
7b68d8ae 190#endif /* HAVE_CRYPTO */
f67beddd 191
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192 if ((config->features & INSECURE) != 0) {
193 /* Send AUTH command according to RFC 2554 */
194 send_remote_command(fd, "AUTH LOGIN");
195 if (read_remote(fd, 0, NULL) != 3) {
196 syslog(LOG_ERR, "%s: remote delivery deferred:"
197 " AUTH login not available: %m", it->queueid);
198 return (1);
199 }
f67beddd 200
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201 len = base64_encode(login, strlen(login), &temp);
202 if (len <= 0)
203 return (-1);
f67beddd 204
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205 send_remote_command(fd, "%s", temp);
206 if (read_remote(fd, 0, NULL) != 3) {
207 syslog(LOG_ERR, "%s: remote delivery deferred:"
208 " AUTH login failed: %m", it->queueid);
209 return (-1);
210 }
f67beddd 211
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212 len = base64_encode(password, strlen(password), &temp);
213 if (len <= 0)
214 return (-1);
215
216 send_remote_command(fd, "%s", temp);
217 res = read_remote(fd, 0, NULL);
218 if (res == 5) {
219 syslog(LOG_ERR, "%s: remote delivery failed:"
220 " Authentication failed: %m", it->queueid);
221 return (-1);
222 } else if (res != 2) {
223 syslog(LOG_ERR, "%s: remote delivery failed:"
224 " AUTH password failed: %m", it->queueid);
225 return (-1);
226 }
227 } else {
228 syslog(LOG_ERR, "%s: non-encrypted SMTP login is disabled in config, so skipping it. ",
229 it->queueid);
230 return (1);
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231 }
232
233 return (0);
234}
235
236static int
237open_connection(struct qitem *it, const char *host)
238{
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239 struct addrinfo hints, *res, *res0;
240 char servname[128];
241 const char *errmsg = NULL;
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242 int fd, error = 0, port;
243
dba19026 244 if (config->port != 0)
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245 port = config->port;
246 else
247 port = SMTP_PORT;
248
7b68d8ae 249 /* FIXME get MX record of host */
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250 /* Shamelessly taken from getaddrinfo(3) */
251 memset(&hints, 0, sizeof(hints));
252 hints.ai_family = PF_UNSPEC;
253 hints.ai_socktype = SOCK_STREAM;
254 hints.ai_protocol = IPPROTO_TCP;
255
256 snprintf(servname, sizeof(servname), "%d", port);
257 error = getaddrinfo(host, servname, &hints, &res0);
258 if (error) {
259 syslog(LOG_ERR, "%s: remote delivery deferred: "
260 "%s: %m", it->queueid, gai_strerror(error));
261 return (-1);
262 }
263 fd = -1;
264 for (res = res0; res; res = res->ai_next) {
265 fd=socket(res->ai_family, res->ai_socktype, res->ai_protocol);
266 if (fd < 0) {
267 errmsg = "socket failed";
268 continue;
269 }
270 if (connect(fd, res->ai_addr, res->ai_addrlen) < 0) {
271 errmsg = "connect failed";
272 close(fd);
273 fd = -1;
274 continue;
275 }
276 break;
277 }
278 if (fd < 0) {
279 syslog(LOG_ERR, "%s: remote delivery deferred: %s (%s:%s)",
280 it->queueid, errmsg, host, servname);
281 freeaddrinfo(res0);
282 return (-1);
283 }
284 freeaddrinfo(res0);
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285 return (fd);
286}
287
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288static void
289copy_qitem(struct qitem *target, struct qitem *it) {
290 target->sender = it->sender;
291 target->addr = it->addr;
292 target->pipeuser = it->pipeuser;
293 target->queuefn = it->queuefn;
294 target->queueid = it->queueid;
295 target->queuef = it->queuef;
296 target->hdrlen = it->hdrlen;
297 target->local = 0;
298}
299
f67beddd 300int
4dcaa51b 301deliver_remote(struct qitem *it, const char **errmsg, struct queue **queue)
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302{
303 struct authuser *a;
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304 char *host, line[1000];
305 int fd, error = 0, do_auth = 0, res = 0;
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306 size_t linelen;
307
308 host = strrchr(it->addr, '@');
309 /* Should not happen */
310 if (host == NULL)
311 return(-1);
312 else
313 /* Step over the @ */
314 host++;
315
316 /* Smarthost support? */
317 if (config->smarthost != NULL && strlen(config->smarthost) > 0) {
318 syslog(LOG_INFO, "%s: using smarthost (%s)",
319 it->queueid, config->smarthost);
320 host = config->smarthost;
321 }
322
323 fd = open_connection(it, host);
324 if (fd < 0)
4dcaa51b 325 return(1);
f67beddd 326
6ef9fe01
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327 /* Check first reply from remote host */
328 config->features |= NOSSL;
7b68d8ae 329 res = read_remote(fd, 0, NULL);
6ef9fe01
MS
330 if (res != 2) {
331 syslog(LOG_INFO, "%s: Invalid initial response: %i",
332 it->queueid, res);
333 return(1);
334 }
335 config->features &= ~NOSSL;
336
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337#ifdef HAVE_CRYPTO
338 if ((config->features & SECURETRANS) != 0) {
339 error = smtp_init_crypto(it, fd, config->features);
340 if (error >= 0)
0ca0cd25 341 syslog(LOG_INFO, "%s: SSL initialization successful",
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342 it->queueid);
343 else
344 goto out;
345 }
346
347 /*
348 * If the user doesn't want STARTTLS, but SSL encryption, we
349 * have to enable SSL first, then send EHLO
350 */
351 if (((config->features & STARTTLS) == 0) &&
352 ((config->features & SECURETRANS) != 0)) {
353 send_remote_command(fd, "EHLO %s", hostname());
7b68d8ae 354 if (read_remote(fd, 0, NULL) != 2) {
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355 syslog(LOG_ERR, "%s: remote delivery deferred: "
356 " EHLO failed: %m", it->queueid);
357 return (-1);
358 }
359 }
360#endif /* HAVE_CRYPTO */
361 if (((config->features & SECURETRANS) == 0)) {
362 send_remote_command(fd, "EHLO %s", hostname());
7b68d8ae 363 if (read_remote(fd, 0, NULL) != 2) {
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364 syslog(LOG_ERR, "%s: remote delivery deferred: "
365 " EHLO failed: %m", it->queueid);
366 return (-1);
367 }
368 }
369
370 /*
371 * Use SMTP authentication if the user defined an entry for the remote
372 * or smarthost
373 */
374 SLIST_FOREACH(a, &authusers, next) {
375 if (strcmp(a->host, host) == 0) {
376 do_auth = 1;
377 break;
378 }
379 }
380
381 if (do_auth == 1) {
b558d098
MS
382 /*
383 * Check if the user wants plain text login without using
384 * encryption.
385 */
7b68d8ae 386 syslog(LOG_INFO, "%s: Use SMTP authentication",
f67beddd 387 it->queueid);
7b68d8ae
MS
388 error = smtp_login(it, fd, a->login, a->password);
389 if (error < 0) {
390 syslog(LOG_ERR, "%s: remote delivery failed:"
b558d098 391 " SMTP login failed: %m", it->queueid);
4dcaa51b 392 return(-1);
b558d098 393 }
7b68d8ae
MS
394 /* SMTP login is not available, so try without */
395 else if (error > 0)
396 syslog(LOG_ERR, "%s: SMTP login not available."
397 " Try without", it->queueid);
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398 }
399
400 send_remote_command(fd, "MAIL FROM:<%s>", it->sender);
7b68d8ae 401 if (read_remote(fd, 0, NULL) != 2) {
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402 syslog(LOG_ERR, "%s: remote delivery deferred:"
403 " MAIL FROM failed: %m", it->queueid);
4dcaa51b 404 return(1);
f67beddd
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405 }
406
4dcaa51b
MS
407 if (queue == NULL) {
408 /* without given queue send only to one receipient */
409 send_remote_command(fd, "RCPT TO:<%s>", it->addr);
410 if (read_remote(fd, 0, NULL) != 2) {
411 syslog(LOG_ERR, "%s: remote delivery deferred:"
412 " RCPT TO failed: %m", it->queueid);
413 return(1);
414 }
415 } else {
416 /* Iterate over all recepients and open only one connection */
417/*
418 * we need 3 queues:
419 * -delivered addresses
420 * -temporary errors
421 * -permanent errors
422 * these 3 queues are given in **queues (+the first queue with all the qitems to send)
423 *
424 */
425
426 struct qitem *tit;
427 int rcpt_success = 0;
428 struct stat st;
429 LIST_FOREACH(tit, &queue[0]->queue, next) {
430 struct qitem *qit;
431 qit = calloc(1, sizeof(struct qitem));
432 copy_qitem(qit, tit);
433
434 if (stat(tit->queuefn, &st) != 0) {
435 syslog(LOG_ERR, "%s: lost queue file `%s'",
436 tit->queueid, tit->queuefn);
437 /* drop qitem and mark it as successfully sent */
438 LIST_INSERT_HEAD(&queue[1]->queue, qit, next);
439 continue;
440 }
441
442 send_remote_command(fd, "RCPT TO:<%s>", tit->addr);
443 switch (read_remote(fd, 0, NULL)) {
444 case 2: /* everythings fine, receipient accepted */
445 /* add item to temporary queue, these items will be deleted in deliver_smarthost */
446 rcpt_success = 1;
447 LIST_INSERT_HEAD(&queue[1]->queue, qit, next);
448 syslog(LOG_INFO, "%s: mail from=<%s> to=<%s>",
449 tit->queueid, tit->sender, tit->addr);
450 break;
451 case 4: /* temporary error, try again later */
452 /* add item to a temporary queue, these items will be tried again */
453 LIST_INSERT_HEAD(&queue[2]->queue, qit, next);
454 syslog(LOG_INFO, "%s: mail from=<%s> to=<%s>",
455 tit->queueid, tit->sender, tit->addr);
456 syslog(LOG_ERR, "%s: remote delivery deferred:"
457 " RCPT TO failed: %m", tit->queueid);
458 break;
459 case 5: /* permanent error, bounce */
460 /* add item to a queue, which will be returned to deliver_smarthost */
461 LIST_INSERT_HEAD(&queue[3]->queue, qit, next);
462 syslog(LOG_INFO, "%s: mail from=<%s> to=<%s>",
463 tit->queueid, tit->sender, tit->addr);
464 syslog(LOG_ERR, "%s: remote delivery failed:"
465 " RCPT TO failed: %m", tit->queueid);
466 break;
467 }
468 }
469 /* if there was no successful RCPT TO, return _WITHOUT_ error */
470 if (!rcpt_success)
471 goto out;
472 }
f67beddd
MS
473
474 send_remote_command(fd, "DATA");
7b68d8ae 475 if (read_remote(fd, 0, NULL) != 3) {
f67beddd
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476 syslog(LOG_ERR, "%s: remote delivery deferred:"
477 " DATA failed: %m", it->queueid);
478 return (1);
479 }
480
481 if (fseek(it->queuef, it->hdrlen, SEEK_SET) != 0) {
482 syslog(LOG_ERR, "%s: remote delivery deferred: cannot seek: %m",
483 it->queueid);
484 return (1);
485 }
486
487 while (!feof(it->queuef)) {
488 if (fgets(line, sizeof(line), it->queuef) == NULL)
489 break;
490 linelen = strlen(line);
491 if (linelen == 0 || line[linelen - 1] != '\n') {
492 syslog(LOG_CRIT, "%s: remote delivery failed:"
493 "corrupted queue file", it->queueid);
494 *errmsg = "corrupted queue file";
495 error = -1;
496 goto out;
497 }
498
499 /* Remove trailing \n's and escape leading dots */
500 trim_line(line);
501
502 /*
503 * If the first character is a dot, we escape it so the line
504 * length increases
505 */
506 if (line[0] == '.')
507 linelen++;
508
509 if (send_remote_command(fd, "%s", line) != (ssize_t)linelen+1) {
510 syslog(LOG_ERR, "%s: remote delivery deferred: "
511 "write error", it->queueid);
512 error = 1;
513 goto out;
514 }
515 }
516
517 send_remote_command(fd, ".");
7b68d8ae 518 if (read_remote(fd, 0, NULL) != 2) {
f67beddd
MS
519 syslog(LOG_ERR, "%s: remote delivery deferred: %m",
520 it->queueid);
521 return (1);
522 }
523
524 send_remote_command(fd, "QUIT");
7b68d8ae 525 if (read_remote(fd, 0, NULL) != 2) {
f67beddd
MS
526 syslog(LOG_ERR, "%s: remote delivery deferred: "
527 "QUIT failed: %m", it->queueid);
528 return (1);
529 }
530out:
531
532 close(fd);
533 return (error);
534}
535