dma: correctly initialize error before delivering mail
[dragonfly.git] / libexec / dma / net.c
CommitLineData
f67beddd
MS
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 $
f67beddd
MS
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>
f67beddd
MS
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];
f67beddd
MS
64
65static void
dba19026 66sig_alarm(int signo __unused)
f67beddd
MS
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;
f67beddd
MS
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);
f67beddd
MS
88
89 if (((config->features & SECURETRANS) != 0) &&
6ef9fe01 90 ((config->features & NOSSL) == 0)) {
2922fd2b
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 }
f67beddd
MS
97 }
98 else {
2922fd2b
SS
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);
f67beddd
MS
109}
110
6ef9fe01 111int
7b68d8ae 112read_remote(int fd, int extbufsize, char *extbuf)
f67beddd 113{
6ef9fe01
MS
114 ssize_t rlen = 0;
115 size_t pos, len;
116 char buff[BUF_SIZE];
7b68d8ae 117 int done = 0, status = 0, extbufpos = 0;
f67beddd
MS
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);
f67beddd
MS
123 }
124 if (setjmp(timeout_alarm) != 0) {
a5a8a1a4 125 snprintf(neterr, sizeof(neterr), "Timeout reached");
f67beddd
MS
126 return (1);
127 }
128 alarm(CON_TIMEOUT);
129
130 /*
6ef9fe01
MS
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;
6ef9fe01
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
MS
168 for (; pos < len && buff[pos] >= '0' && buff[pos] <= '9'; pos++)
169 ; /* Do nothing */
f67beddd 170
6ef9fe01
MS
171 if (pos == len)
172 return (0);
f67beddd 173
6ef9fe01
MS
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);
6ef9fe01
MS
190 status = atoi(buff);
191 return (status/100);
f67beddd
MS
192}
193
194/*
195 * Handle SMTP authentication
f67beddd
MS
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
7b68d8ae
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
7b68d8ae
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) {
99d6192f 220 syslog(LOG_NOTICE, "%s: remote delivery deferred:"
a5a8a1a4
SS
221 " AUTH login not available: %s",
222 it->queueid, neterr);
7b68d8ae
MS
223 return (1);
224 }
f67beddd 225
7b68d8ae
MS
226 len = base64_encode(login, strlen(login), &temp);
227 if (len <= 0)
228 return (-1);
f67beddd 229
7b68d8ae
MS
230 send_remote_command(fd, "%s", temp);
231 if (read_remote(fd, 0, NULL) != 3) {
99d6192f 232 syslog(LOG_NOTICE, "%s: remote delivery deferred:"
a5a8a1a4
SS
233 " AUTH login failed: %s", it->queueid,
234 neterr);
7b68d8ae
MS
235 return (-1);
236 }
f67beddd 237
7b68d8ae
MS
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) {
99d6192f 245 syslog(LOG_NOTICE, "%s: remote delivery failed:"
a5a8a1a4
SS
246 " Authentication failed: %s",
247 it->queueid, neterr);
7b68d8ae
MS
248 return (-1);
249 } else if (res != 2) {
99d6192f 250 syslog(LOG_NOTICE, "%s: remote delivery failed:"
a5a8a1a4
SS
251 " AUTH password failed: %s",
252 it->queueid, neterr);
7b68d8ae
MS
253 return (-1);
254 }
255 } else {
99d6192f 256 syslog(LOG_WARNING, "%s: non-encrypted SMTP login is disabled in config, so skipping it. ",
7b68d8ae
MS
257 it->queueid);
258 return (1);
f67beddd
MS
259 }
260
261 return (0);
262}
263
264static int
265open_connection(struct qitem *it, const char *host)
266{
f67beddd
MS
267 struct addrinfo hints, *res, *res0;
268 char servname[128];
269 const char *errmsg = NULL;
f67beddd
MS
270 int fd, error = 0, port;
271
dba19026 272 if (config->port != 0)
f67beddd
MS
273 port = config->port;
274 else
275 port = SMTP_PORT;
276
7b68d8ae 277 /* FIXME get MX record of host */
f67beddd
MS
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) {
99d6192f 287 syslog(LOG_NOTICE, "%s: remote delivery deferred: "
f67beddd
MS
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) {
99d6192f 307 syslog(LOG_NOTICE, "%s: remote delivery deferred: %s (%s:%s)",
f67beddd
MS
308 it->queueid, errmsg, host, servname);
309 freeaddrinfo(res0);
310 return (-1);
311 }
312 freeaddrinfo(res0);
f67beddd
MS
313 return (fd);
314}
315
316int
5868e44c 317deliver_remote(struct qitem *it, const 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 322 size_t linelen;
5868e44c
SS
323 /* asprintf can't take const */
324 void *errmsgc = __DECONST(char **, errmsg);
f67beddd
MS
325
326 host = strrchr(it->addr, '@');
327 /* Should not happen */
39f7c85a 328 if (host == NULL) {
5868e44c 329 asprintf(errmsgc, "Internal error: badly formed address %s",
39f7c85a 330 it->addr);
f67beddd 331 return(-1);
39f7c85a 332 } else {
f67beddd
MS
333 /* Step over the @ */
334 host++;
39f7c85a 335 }
f67beddd
MS
336
337 /* Smarthost support? */
338 if (config->smarthost != NULL && strlen(config->smarthost) > 0) {
4a23bd3d
MS
339 syslog(LOG_INFO, "%s: using smarthost (%s:%i)",
340 it->queueid, config->smarthost, config->port);
f67beddd
MS
341 host = config->smarthost;
342 }
343
344 fd = open_connection(it, host);
345 if (fd < 0)
4a23bd3d 346 return (1);
f67beddd 347
6ef9fe01
MS
348 /* Check first reply from remote host */
349 config->features |= NOSSL;
7b68d8ae 350 res = read_remote(fd, 0, NULL);
6ef9fe01 351 if (res != 2) {
99d6192f 352 syslog(LOG_WARNING, "%s: Invalid initial response: %i",
6ef9fe01
MS
353 it->queueid, res);
354 return(1);
355 }
356 config->features &= ~NOSSL;
357
f67beddd
MS
358#ifdef HAVE_CRYPTO
359 if ((config->features & SECURETRANS) != 0) {
360 error = smtp_init_crypto(it, fd, config->features);
361 if (error >= 0)
0ca0cd25 362 syslog(LOG_INFO, "%s: SSL initialization successful",
f67beddd
MS
363 it->queueid);
364 else
365 goto out;
366 }
f67beddd 367#endif /* HAVE_CRYPTO */
66674731
SS
368
369 send_remote_command(fd, "EHLO %s", hostname());
370 if (read_remote(fd, 0, NULL) != 2) {
99d6192f 371 syslog(LOG_WARNING, "%s: remote delivery deferred: "
66674731
SS
372 " EHLO failed: %s", it->queueid, neterr);
373 asprintf(errmsgc, "%s did not like our EHLO:\n%s",
374 host, neterr);
375 return (-1);
f67beddd
MS
376 }
377
378 /*
379 * Use SMTP authentication if the user defined an entry for the remote
380 * or smarthost
381 */
382 SLIST_FOREACH(a, &authusers, next) {
383 if (strcmp(a->host, host) == 0) {
384 do_auth = 1;
385 break;
386 }
387 }
388
389 if (do_auth == 1) {
b558d098
MS
390 /*
391 * Check if the user wants plain text login without using
392 * encryption.
393 */
7b68d8ae 394 syslog(LOG_INFO, "%s: Use SMTP authentication",
f67beddd 395 it->queueid);
7b68d8ae
MS
396 error = smtp_login(it, fd, a->login, a->password);
397 if (error < 0) {
398 syslog(LOG_ERR, "%s: remote delivery failed:"
b558d098 399 " SMTP login failed: %m", it->queueid);
5868e44c 400 asprintf(errmsgc, "SMTP login to %s failed", host);
4a23bd3d 401 return (-1);
b558d098 402 }
7b68d8ae
MS
403 /* SMTP login is not available, so try without */
404 else if (error > 0)
99d6192f 405 syslog(LOG_WARNING, "%s: SMTP login not available."
7b68d8ae 406 " Try without", it->queueid);
f67beddd
MS
407 }
408
7dfd2fd8
SS
409#define READ_REMOTE_CHECK(c, exp) \
410 res = read_remote(fd, 0, NULL); \
411 if (res == 5) { \
412 syslog(LOG_ERR, "%s: remote delivery failed: " \
413 c " failed: %s", it->queueid, neterr); \
5868e44c 414 asprintf(errmsgc, "%s did not like our " c ":\n%s", \
39f7c85a 415 host, neterr); \
7dfd2fd8
SS
416 return (-1); \
417 } else if (res != exp) { \
99d6192f 418 syslog(LOG_NOTICE, "%s: remote delivery deferred: " \
7dfd2fd8
SS
419 c " failed: %s", it->queueid, neterr); \
420 return (1); \
f67beddd
MS
421 }
422
7dfd2fd8
SS
423 send_remote_command(fd, "MAIL FROM:<%s>", it->sender);
424 READ_REMOTE_CHECK("MAIL FROM", 2);
425
4a23bd3d 426 send_remote_command(fd, "RCPT TO:<%s>", it->addr);
7dfd2fd8 427 READ_REMOTE_CHECK("RCPT TO", 2);
f67beddd
MS
428
429 send_remote_command(fd, "DATA");
7dfd2fd8 430 READ_REMOTE_CHECK("DATA", 3);
f67beddd
MS
431
432 if (fseek(it->queuef, it->hdrlen, SEEK_SET) != 0) {
a5a8a1a4
SS
433 syslog(LOG_ERR, "%s: remote delivery deferred: cannot seek: %s",
434 it->queueid, neterr);
f67beddd
MS
435 return (1);
436 }
437
0caaabf6 438 error = 0;
f67beddd
MS
439 while (!feof(it->queuef)) {
440 if (fgets(line, sizeof(line), it->queuef) == NULL)
441 break;
442 linelen = strlen(line);
443 if (linelen == 0 || line[linelen - 1] != '\n') {
444 syslog(LOG_CRIT, "%s: remote delivery failed:"
445 "corrupted queue file", it->queueid);
5868e44c 446 *errmsg = "corrupted queue file";
f67beddd
MS
447 error = -1;
448 goto out;
449 }
450
451 /* Remove trailing \n's and escape leading dots */
452 trim_line(line);
453
454 /*
455 * If the first character is a dot, we escape it so the line
456 * length increases
457 */
458 if (line[0] == '.')
459 linelen++;
460
461 if (send_remote_command(fd, "%s", line) != (ssize_t)linelen+1) {
99d6192f 462 syslog(LOG_NOTICE, "%s: remote delivery deferred: "
f67beddd
MS
463 "write error", it->queueid);
464 error = 1;
465 goto out;
466 }
467 }
468
469 send_remote_command(fd, ".");
7dfd2fd8 470 READ_REMOTE_CHECK("final DATA", 2);
f67beddd
MS
471
472 send_remote_command(fd, "QUIT");
6cfc247d 473 if (read_remote(fd, 0, NULL) != 2)
99d6192f 474 syslog(LOG_INFO, "%s: remote delivery succeeded but "
a5a8a1a4 475 "QUIT failed: %s", it->queueid, neterr);
f67beddd
MS
476out:
477
478 close(fd);
479 return (error);
480}
481