[people/ms/dma.git] / net.c

/*
 * Copyright (c) 2008 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Matthias Schmidt <matthias@dragonflybsd.org>, University of Marburg,
 * Germany.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name of The DragonFly Project nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific, prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $DragonFly: src/libexec/dma/net.c,v 1.9 2008/09/30 17:47:21 swildner Exp $
 */

#include <sys/param.h>
#include <sys/queue.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#ifdef HAVE_CRYPTO
#include <openssl/ssl.h>
#endif /* HAVE_CRYPTO */

#include <err.h>
#include <errno.h>
#include <netdb.h>
#include <setjmp.h>
#include <signal.h>
#include <syslog.h>
#include <unistd.h>

#include "dma.h"

extern struct config *config;
extern struct authusers authusers;
static jmp_buf timeout_alarm;
char neterr[BUF_SIZE];

static void
sig_alarm(int signo __unused)
{
	longjmp(timeout_alarm, 1);
}

ssize_t
send_remote_command(int fd, const char* fmt, ...)
{
	va_list va;
	char cmd[4096];
	ssize_t len = 0;

	va_start(va, fmt);
	vsprintf(cmd, fmt, va);

	if (((config->features & SECURETRANS) != 0) &&
	    ((config->features & NOSSL) == 0)) {
		len = SSL_write(config->ssl, (const char*)cmd, strlen(cmd));
		SSL_write(config->ssl, "\r\n", 2);
	}
	else {
		len = write(fd, cmd, strlen(cmd));
		write(fd, "\r\n", 2);
	}
	va_end(va);

	return (len+2);
}

int
read_remote(int fd, int extbufsize, char *extbuf)
{
	ssize_t rlen = 0;
	size_t pos, len;
	char buff[BUF_SIZE];
	int done = 0, status = 0, extbufpos = 0;

	if (signal(SIGALRM, sig_alarm) == SIG_ERR) {
		snprintf(neterr, sizeof(neterr), "SIGALRM error: %s",
		    strerror(errno));
		return (1);
	}
	if (setjmp(timeout_alarm) != 0) {
		snprintf(neterr, sizeof(neterr), "Timeout reached");
		return (1);
	}
	alarm(CON_TIMEOUT);

	/*
	 * Remote reading code from femail.c written by Henning Brauer of
	 * OpenBSD and released under a BSD style license.
	 */
	for (len = pos = 0; !done; ) {
		rlen = 0;
		if (pos == 0 ||
		    (pos > 0 && memchr(buff + pos, '\n', len - pos) == NULL)) {
			memmove(buff, buff + pos, len - pos);
			len -= pos;
			pos = 0;
			if (((config->features & SECURETRANS) != 0) &&
			    (config->features & NOSSL) == 0) {
				if ((rlen = SSL_read(config->ssl, buff + len,
				    sizeof(buff) - len)) == -1)
					err(1, "read");
			} else {
				if ((rlen = read(fd, buff + len,
				    sizeof(buff) - len)) == -1)
					err(1, "read");
			}
			len += rlen;
		}
		/*
		 * If there is an external buffer with a size bigger than zero
		 * and as long as there is space in the external buffer and
		 * there are new characters read from the mailserver
		 * copy them to the external buffer
		 */
		if (extbufpos <= (extbufsize - 1) && rlen && extbufsize > 0 
		    && extbuf != NULL) {
			/* do not write over the bounds of the buffer */
			if(extbufpos + rlen > (extbufsize - 1)) {
				rlen = extbufsize - extbufpos;
			}
			memcpy(extbuf + extbufpos, buff + len - rlen, rlen);
			extbufpos += rlen;
		}
		for (; pos < len && buff[pos] >= '0' && buff[pos] <= '9'; pos++)
			; /* Do nothing */

		if (pos == len)
			return (0);

		if (buff[pos] == ' ')
			done = 1;
		else if (buff[pos] != '-')
			syslog(LOG_ERR, "invalid syntax in reply from server");

		/* skip up to \n */
		for (; pos < len && buff[pos - 1] != '\n'; pos++)
			; /* Do nothing */

	}
	alarm(0);

	buff[len] = '\0';
	while (len > 0 && (buff[len - 1] == '\r' || buff[len - 1] == '\n'))
		buff[--len] = '\0';
	snprintf(neterr, sizeof(neterr), "%s", buff);
	status = atoi(buff);
	return (status/100);
}

/*
 * Handle SMTP authentication
 */
static int
smtp_login(struct qitem *it, int fd, char *login, char* password)
{
	char *temp;
	int len, res = 0;

#ifdef HAVE_CRYPTO
	res = smtp_auth_md5(it, fd, login, password);
	if (res == 0) {
		return (0);
	} else if (res == -2) {
	/*
	 * If the return code is -2, then then the login attempt failed, 
	 * do not try other login mechanisms
	 */
		return (-1);
	}
#endif /* HAVE_CRYPTO */

	if ((config->features & INSECURE) != 0) {
		/* Send AUTH command according to RFC 2554 */
		send_remote_command(fd, "AUTH LOGIN");
		if (read_remote(fd, 0, NULL) != 3) {
			syslog(LOG_ERR, "%s: remote delivery deferred:"
					" AUTH login not available: %s",
					it->queueid, neterr);
			return (1);
		}

		len = base64_encode(login, strlen(login), &temp);
		if (len <= 0)
			return (-1);

		send_remote_command(fd, "%s", temp);
		if (read_remote(fd, 0, NULL) != 3) {
			syslog(LOG_ERR, "%s: remote delivery deferred:"
					" AUTH login failed: %s", it->queueid,
					neterr);
			return (-1);
		}

		len = base64_encode(password, strlen(password), &temp);
		if (len <= 0)
			return (-1);

		send_remote_command(fd, "%s", temp);
		res = read_remote(fd, 0, NULL);
		if (res == 5) {
			syslog(LOG_ERR, "%s: remote delivery failed:"
					" Authentication failed: %s",
					it->queueid, neterr);
			return (-1);
		} else if (res != 2) {
			syslog(LOG_ERR, "%s: remote delivery failed:"
					" AUTH password failed: %s",
					it->queueid, neterr);
			return (-1);
		}
	} else {
		syslog(LOG_ERR, "%s: non-encrypted SMTP login is disabled in config, so skipping it. ",
				it->queueid);
		return (1);
	}

	return (0);
}

static int
open_connection(struct qitem *it, const char *host)
{
	struct addrinfo hints, *res, *res0;
	char servname[128];
	const char *errmsg = NULL;
	int fd, error = 0, port;

	if (config->port != 0)
		port = config->port;
	else
		port = SMTP_PORT;

	/* FIXME get MX record of host */
	/* Shamelessly taken from getaddrinfo(3) */
	memset(&hints, 0, sizeof(hints));
	hints.ai_family = PF_UNSPEC;
	hints.ai_socktype = SOCK_STREAM;
	hints.ai_protocol = IPPROTO_TCP;

	snprintf(servname, sizeof(servname), "%d", port);
	error = getaddrinfo(host, servname, &hints, &res0);
	if (error) {
		syslog(LOG_ERR, "%s: remote delivery deferred: "
		       "%s: %m", it->queueid, gai_strerror(error));
		return (-1);
	}
	fd = -1;
	for (res = res0; res; res = res->ai_next) {
		fd=socket(res->ai_family, res->ai_socktype, res->ai_protocol);
		if (fd < 0) {
			errmsg = "socket failed";
			continue;
		}
		if (connect(fd, res->ai_addr, res->ai_addrlen) < 0) {
			errmsg = "connect failed";
			close(fd);
			fd = -1;
			continue;
		}
		break;
	}
	if (fd < 0) {
		syslog(LOG_ERR, "%s: remote delivery deferred: %s (%s:%s)",
			it->queueid, errmsg, host, servname);
		freeaddrinfo(res0);
		return (-1);
	}
	freeaddrinfo(res0);
	return (fd);
}

int
deliver_remote(struct qitem *it, const char **errmsg)
{
	struct authuser *a;
	char *host, line[1000];
	int fd, error = 0, do_auth = 0, res = 0;
	size_t linelen;

	host = strrchr(it->addr, '@');
	/* Should not happen */
	if (host == NULL)
		return(-1);
	else
		/* Step over the @ */
		host++;

	/* Smarthost support? */
	if (config->smarthost != NULL && strlen(config->smarthost) > 0) {
		syslog(LOG_INFO, "%s: using smarthost (%s:%i)",
		       it->queueid, config->smarthost, config->port);
		host = config->smarthost;
	}

	fd = open_connection(it, host);
	if (fd < 0)
		return (1);

	/* Check first reply from remote host */
	config->features |= NOSSL;
	res = read_remote(fd, 0, NULL);
	if (res != 2) {
		syslog(LOG_INFO, "%s: Invalid initial response: %i",
			it->queueid, res);
		return(1);
	}
	config->features &= ~NOSSL;

#ifdef HAVE_CRYPTO
	if ((config->features & SECURETRANS) != 0) {
		error = smtp_init_crypto(it, fd, config->features);
		if (error >= 0)
			syslog(LOG_INFO, "%s: SSL initialization successful",
				it->queueid);
		else
			goto out;
	}

	/*
	 * If the user doesn't want STARTTLS, but SSL encryption, we
	 * have to enable SSL first, then send EHLO
	 */
	if (((config->features & STARTTLS) == 0) &&
	    ((config->features & SECURETRANS) != 0)) {
		send_remote_command(fd, "EHLO %s", hostname());
		if (read_remote(fd, 0, NULL) != 2) {
			syslog(LOG_ERR, "%s: remote delivery deferred: "
			       " EHLO failed: %s", it->queueid, neterr);
			return (-1);
		}
	}
#endif /* HAVE_CRYPTO */
	if (((config->features & SECURETRANS) == 0)) {
		send_remote_command(fd, "EHLO %s", hostname());
		if (read_remote(fd, 0, NULL) != 2) {
			syslog(LOG_ERR, "%s: remote delivery deferred: "
			       " EHLO failed: %s", it->queueid, neterr);
			return (-1);
		}
	}

	/*
	 * Use SMTP authentication if the user defined an entry for the remote
	 * or smarthost
	 */
	SLIST_FOREACH(a, &authusers, next) {
		if (strcmp(a->host, host) == 0) {
			do_auth = 1;
			break;
		}
	}

	if (do_auth == 1) {
		/*
		 * Check if the user wants plain text login without using
		 * encryption.
		 */
		syslog(LOG_INFO, "%s: Use SMTP authentication",
				it->queueid);
		error = smtp_login(it, fd, a->login, a->password);
		if (error < 0) {
			syslog(LOG_ERR, "%s: remote delivery failed:"
					" SMTP login failed: %m", it->queueid);
			return (-1);
		}
		/* SMTP login is not available, so try without */
		else if (error > 0)
			syslog(LOG_ERR, "%s: SMTP login not available."
					" Try without", it->queueid);
	}

	send_remote_command(fd, "MAIL FROM:<%s>", it->sender);
	if (read_remote(fd, 0, NULL) != 2) {
		syslog(LOG_ERR, "%s: remote delivery deferred:"
		       " MAIL FROM failed: %s", it->queueid, neterr);
		return (1);
	}

	send_remote_command(fd, "RCPT TO:<%s>", it->addr);
	if (read_remote(fd, 0, NULL) != 2) {
		syslog(LOG_ERR, "%s: remote delivery deferred:"
				" RCPT TO failed: %s", it->queueid, neterr);
		return (1);
	}

	send_remote_command(fd, "DATA");
	if (read_remote(fd, 0, NULL) != 3) {
		syslog(LOG_ERR, "%s: remote delivery deferred:"
		       " DATA failed: %s", it->queueid, neterr);
		return (1);
	}

	if (fseek(it->queuef, it->hdrlen, SEEK_SET) != 0) {
		syslog(LOG_ERR, "%s: remote delivery deferred: cannot seek: %s",
		       it->queueid, neterr);
		return (1);
	}

	while (!feof(it->queuef)) {
		if (fgets(line, sizeof(line), it->queuef) == NULL)
			break;
		linelen = strlen(line);
		if (linelen == 0 || line[linelen - 1] != '\n') {
			syslog(LOG_CRIT, "%s: remote delivery failed:"
				"corrupted queue file", it->queueid);
			*errmsg = "corrupted queue file";
			error = -1;
			goto out;
		}

		/* Remove trailing \n's and escape leading dots */
		trim_line(line);

		/*
		 * If the first character is a dot, we escape it so the line
		 * length increases
		*/
		if (line[0] == '.')
			linelen++;

		if (send_remote_command(fd, "%s", line) != (ssize_t)linelen+1) {
			syslog(LOG_ERR, "%s: remote delivery deferred: "
				"write error", it->queueid);
			error = 1;
			goto out;
		}
	}

	send_remote_command(fd, ".");
	if (read_remote(fd, 0, NULL) != 2) {
		syslog(LOG_ERR, "%s: remote delivery deferred: %s",
		       it->queueid, neterr);
		return (1);
	}

	send_remote_command(fd, "QUIT");
	if (read_remote(fd, 0, NULL) != 2)
		syslog(LOG_WARNING, "%s: remote delivery succeeded but "
		       "QUIT failed: %s", it->queueid, neterr);
out:

	close(fd);
	return (error);
}
Commit	Line	Data
86e4d161 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	*
c507d897	35	* $DragonFly: src/libexec/dma/net.c,v 1.9 2008/09/30 17:47:21 swildner Exp $
86e4d161 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
c507d897	50	#include <err.h>
7a73c463	51	#include <errno.h>
86e4d161 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
	60	extern struct config *config;
	61	extern struct authusers authusers;
	62	static jmp_buf timeout_alarm;
7a73c463	63	char neterr[BUF_SIZE];
86e4d161 MS	64
86e4d161 MS	65	static void
65bec70e	66	sig_alarm(int signo __unused)
86e4d161 MS	67	{
	68	longjmp(timeout_alarm, 1);
	69	}
	70
	71	ssize_t
	72	send_remote_command(int fd, const char* fmt, ...)
	73	{
	74	va_list va;
	75	char cmd[4096];
	76	ssize_t len = 0;
	77
	78	va_start(va, fmt);
	79	vsprintf(cmd, fmt, va);
	80
	81	if (((config->features & SECURETRANS) != 0) &&
50c8e68a	82	((config->features & NOSSL) == 0)) {
86e4d161 MS	83	len = SSL_write(config->ssl, (const char*)cmd, strlen(cmd));
	84	SSL_write(config->ssl, "\r\n", 2);
	85	}
	86	else {
	87	len = write(fd, cmd, strlen(cmd));
	88	write(fd, "\r\n", 2);
	89	}
	90	va_end(va);
	91
	92	return (len+2);
	93	}
	94
50c8e68a	95	int
bf28fcc6	96	read_remote(int fd, int extbufsize, char *extbuf)
86e4d161	97	{
50c8e68a MS	98	ssize_t rlen = 0;
	99	size_t pos, len;
	100	char buff[BUF_SIZE];
bf28fcc6	101	int done = 0, status = 0, extbufpos = 0;
86e4d161 MS	102
86e4d161 MS	103	if (signal(SIGALRM, sig_alarm) == SIG_ERR) {
7a73c463 SS	104	snprintf(neterr, sizeof(neterr), "SIGALRM error: %s",
	105	strerror(errno));
	106	return (1);
86e4d161 MS	107	}
86e4d161 MS	108	if (setjmp(timeout_alarm) != 0) {
7a73c463	109	snprintf(neterr, sizeof(neterr), "Timeout reached");
86e4d161 MS	110	return (1);
	111	}
	112	alarm(CON_TIMEOUT);
	113
	114	/*
50c8e68a MS	115	* Remote reading code from femail.c written by Henning Brauer of
50c8e68a MS	116	* OpenBSD and released under a BSD style license.
86e4d161	117	*/
50c8e68a	118	for (len = pos = 0; !done; ) {
bf28fcc6	119	rlen = 0;
50c8e68a MS	120	if (pos == 0 \|\|
	121	(pos > 0 && memchr(buff + pos, '\n', len - pos) == NULL)) {
	122	memmove(buff, buff + pos, len - pos);
	123	len -= pos;
	124	pos = 0;
	125	if (((config->features & SECURETRANS) != 0) &&
	126	(config->features & NOSSL) == 0) {
	127	if ((rlen = SSL_read(config->ssl, buff + len,
	128	sizeof(buff) - len)) == -1)
	129	err(1, "read");
	130	} else {
	131	if ((rlen = read(fd, buff + len,
	132	sizeof(buff) - len)) == -1)
	133	err(1, "read");
	134	}
	135	len += rlen;
	136	}
bf28fcc6 MS	137	/*
	138	* If there is an external buffer with a size bigger than zero
	139	* and as long as there is space in the external buffer and
	140	* there are new characters read from the mailserver
	141	* copy them to the external buffer
	142	*/
	143	if (extbufpos <= (extbufsize - 1) && rlen && extbufsize > 0
	144	&& extbuf != NULL) {
	145	/* do not write over the bounds of the buffer */
	146	if(extbufpos + rlen > (extbufsize - 1)) {
	147	rlen = extbufsize - extbufpos;
	148	}
	149	memcpy(extbuf + extbufpos, buff + len - rlen, rlen);
	150	extbufpos += rlen;
	151	}
50c8e68a MS	152	for (; pos < len && buff[pos] >= '0' && buff[pos] <= '9'; pos++)
50c8e68a MS	153	; /* Do nothing */
86e4d161	154
50c8e68a MS	155	if (pos == len)
50c8e68a MS	156	return (0);
86e4d161	157
50c8e68a MS	158	if (buff[pos] == ' ')
	159	done = 1;
	160	else if (buff[pos] != '-')
	161	syslog(LOG_ERR, "invalid syntax in reply from server");
86e4d161	162
50c8e68a MS	163	/* skip up to \n */
	164	for (; pos < len && buff[pos - 1] != '\n'; pos++)
	165	; /* Do nothing */
86e4d161	166
86e4d161	167	}
50c8e68a MS	168	alarm(0);
50c8e68a MS	169
7a73c463 SS	170	buff[len] = '\0';
	171	while (len > 0 && (buff[len - 1] == '\r' \|\| buff[len - 1] == '\n'))
	172	buff[--len] = '\0';
	173	snprintf(neterr, sizeof(neterr), "%s", buff);
50c8e68a MS	174	status = atoi(buff);
50c8e68a MS	175	return (status/100);
86e4d161 MS	176	}
	177
	178	/*
	179	* Handle SMTP authentication
86e4d161 MS	180	*/
	181	static int
	182	smtp_login(struct qitem it, int fd, char login, char* password)
	183	{
86e4d161	184	char *temp;
50c8e68a	185	int len, res = 0;
86e4d161	186
bf28fcc6 MS	187	#ifdef HAVE_CRYPTO
	188	res = smtp_auth_md5(it, fd, login, password);
	189	if (res == 0) {
	190	return (0);
	191	} else if (res == -2) {
	192	/*
	193	* If the return code is -2, then then the login attempt failed,
	194	* do not try other login mechanisms
	195	*/
	196	return (-1);
86e4d161	197	}
bf28fcc6	198	#endif /* HAVE_CRYPTO */
86e4d161	199
bf28fcc6 MS	200	if ((config->features & INSECURE) != 0) {
	201	/* Send AUTH command according to RFC 2554 */
	202	send_remote_command(fd, "AUTH LOGIN");
	203	if (read_remote(fd, 0, NULL) != 3) {
	204	syslog(LOG_ERR, "%s: remote delivery deferred:"
7a73c463 SS	205	" AUTH login not available: %s",
7a73c463 SS	206	it->queueid, neterr);
bf28fcc6 MS	207	return (1);
bf28fcc6 MS	208	}
86e4d161	209
bf28fcc6 MS	210	len = base64_encode(login, strlen(login), &temp);
	211	if (len <= 0)
	212	return (-1);
86e4d161	213
bf28fcc6 MS	214	send_remote_command(fd, "%s", temp);
	215	if (read_remote(fd, 0, NULL) != 3) {
	216	syslog(LOG_ERR, "%s: remote delivery deferred:"
7a73c463 SS	217	" AUTH login failed: %s", it->queueid,
7a73c463 SS	218	neterr);
bf28fcc6 MS	219	return (-1);
bf28fcc6 MS	220	}
86e4d161	221
bf28fcc6 MS	222	len = base64_encode(password, strlen(password), &temp);
	223	if (len <= 0)
	224	return (-1);
	225
	226	send_remote_command(fd, "%s", temp);
	227	res = read_remote(fd, 0, NULL);
	228	if (res == 5) {
	229	syslog(LOG_ERR, "%s: remote delivery failed:"
7a73c463 SS	230	" Authentication failed: %s",
7a73c463 SS	231	it->queueid, neterr);
bf28fcc6 MS	232	return (-1);
	233	} else if (res != 2) {
	234	syslog(LOG_ERR, "%s: remote delivery failed:"
7a73c463 SS	235	" AUTH password failed: %s",
7a73c463 SS	236	it->queueid, neterr);
bf28fcc6 MS	237	return (-1);
	238	}
	239	} else {
	240	syslog(LOG_ERR, "%s: non-encrypted SMTP login is disabled in config, so skipping it. ",
	241	it->queueid);
	242	return (1);
86e4d161 MS	243	}
	244
	245	return (0);
	246	}
	247
	248	static int
	249	open_connection(struct qitem it, const char host)
	250	{
86e4d161 MS	251	struct addrinfo hints, res, res0;
	252	char servname[128];
	253	const char *errmsg = NULL;
86e4d161 MS	254	int fd, error = 0, port;
86e4d161 MS	255
65bec70e	256	if (config->port != 0)
86e4d161 MS	257	port = config->port;
	258	else
	259	port = SMTP_PORT;
	260
bf28fcc6	261	/* FIXME get MX record of host */
86e4d161 MS	262	/* Shamelessly taken from getaddrinfo(3) */
	263	memset(&hints, 0, sizeof(hints));
	264	hints.ai_family = PF_UNSPEC;
	265	hints.ai_socktype = SOCK_STREAM;
	266	hints.ai_protocol = IPPROTO_TCP;
	267
	268	snprintf(servname, sizeof(servname), "%d", port);
	269	error = getaddrinfo(host, servname, &hints, &res0);
	270	if (error) {
	271	syslog(LOG_ERR, "%s: remote delivery deferred: "
	272	"%s: %m", it->queueid, gai_strerror(error));
	273	return (-1);
	274	}
	275	fd = -1;
	276	for (res = res0; res; res = res->ai_next) {
	277	fd=socket(res->ai_family, res->ai_socktype, res->ai_protocol);
	278	if (fd < 0) {
	279	errmsg = "socket failed";
	280	continue;
	281	}
	282	if (connect(fd, res->ai_addr, res->ai_addrlen) < 0) {
	283	errmsg = "connect failed";
	284	close(fd);
	285	fd = -1;
	286	continue;
	287	}
	288	break;
	289	}
	290	if (fd < 0) {
	291	syslog(LOG_ERR, "%s: remote delivery deferred: %s (%s:%s)",
	292	it->queueid, errmsg, host, servname);
	293	freeaddrinfo(res0);
	294	return (-1);
	295	}
	296	freeaddrinfo(res0);
86e4d161 MS	297	return (fd);
	298	}
	299
	300	int
e0a95d28	301	deliver_remote(struct qitem it, const char *errmsg)
86e4d161 MS	302	{
86e4d161 MS	303	struct authuser *a;
50c8e68a MS	304	char *host, line[1000];
50c8e68a MS	305	int fd, error = 0, do_auth = 0, res = 0;
86e4d161 MS	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) {
e0a95d28 MS	318	syslog(LOG_INFO, "%s: using smarthost (%s:%i)",
e0a95d28 MS	319	it->queueid, config->smarthost, config->port);
86e4d161 MS	320	host = config->smarthost;
	321	}
	322
	323	fd = open_connection(it, host);
	324	if (fd < 0)
e0a95d28	325	return (1);
86e4d161	326
50c8e68a MS	327	/* Check first reply from remote host */
50c8e68a MS	328	config->features \|= NOSSL;
bf28fcc6	329	res = read_remote(fd, 0, NULL);
50c8e68a 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
86e4d161 MS	337	#ifdef HAVE_CRYPTO
	338	if ((config->features & SECURETRANS) != 0) {
	339	error = smtp_init_crypto(it, fd, config->features);
	340	if (error >= 0)
40234162	341	syslog(LOG_INFO, "%s: SSL initialization successful",
86e4d161 MS	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());
bf28fcc6	354	if (read_remote(fd, 0, NULL) != 2) {
86e4d161	355	syslog(LOG_ERR, "%s: remote delivery deferred: "
7a73c463	356	" EHLO failed: %s", it->queueid, neterr);
86e4d161 MS	357	return (-1);
	358	}
	359	}
	360	#endif /* HAVE_CRYPTO */
	361	if (((config->features & SECURETRANS) == 0)) {
	362	send_remote_command(fd, "EHLO %s", hostname());
bf28fcc6	363	if (read_remote(fd, 0, NULL) != 2) {
86e4d161	364	syslog(LOG_ERR, "%s: remote delivery deferred: "
7a73c463	365	" EHLO failed: %s", it->queueid, neterr);
86e4d161 MS	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) {
dfce7456 MS	382	/*
	383	* Check if the user wants plain text login without using
	384	* encryption.
	385	*/
bf28fcc6	386	syslog(LOG_INFO, "%s: Use SMTP authentication",
86e4d161	387	it->queueid);
bf28fcc6 MS	388	error = smtp_login(it, fd, a->login, a->password);
	389	if (error < 0) {
	390	syslog(LOG_ERR, "%s: remote delivery failed:"
dfce7456	391	" SMTP login failed: %m", it->queueid);
e0a95d28	392	return (-1);
dfce7456	393	}
bf28fcc6 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);
86e4d161 MS	398	}
	399
	400	send_remote_command(fd, "MAIL FROM:<%s>", it->sender);
bf28fcc6	401	if (read_remote(fd, 0, NULL) != 2) {
86e4d161	402	syslog(LOG_ERR, "%s: remote delivery deferred:"
7a73c463	403	" MAIL FROM failed: %s", it->queueid, neterr);
e0a95d28	404	return (1);
86e4d161 MS	405	}
86e4d161 MS	406
e0a95d28 MS	407	send_remote_command(fd, "RCPT TO:<%s>", it->addr);
	408	if (read_remote(fd, 0, NULL) != 2) {
	409	syslog(LOG_ERR, "%s: remote delivery deferred:"
7a73c463	410	" RCPT TO failed: %s", it->queueid, neterr);
e0a95d28 MS	411	return (1);
e0a95d28 MS	412	}
86e4d161 MS	413
86e4d161 MS	414	send_remote_command(fd, "DATA");
bf28fcc6	415	if (read_remote(fd, 0, NULL) != 3) {
86e4d161	416	syslog(LOG_ERR, "%s: remote delivery deferred:"
7a73c463	417	" DATA failed: %s", it->queueid, neterr);
86e4d161 MS	418	return (1);
	419	}
	420
	421	if (fseek(it->queuef, it->hdrlen, SEEK_SET) != 0) {
7a73c463 SS	422	syslog(LOG_ERR, "%s: remote delivery deferred: cannot seek: %s",
7a73c463 SS	423	it->queueid, neterr);
86e4d161 MS	424	return (1);
	425	}
	426
	427	while (!feof(it->queuef)) {
	428	if (fgets(line, sizeof(line), it->queuef) == NULL)
	429	break;
	430	linelen = strlen(line);
	431	if (linelen == 0 \|\| line[linelen - 1] != '\n') {
	432	syslog(LOG_CRIT, "%s: remote delivery failed:"
	433	"corrupted queue file", it->queueid);
	434	*errmsg = "corrupted queue file";
	435	error = -1;
	436	goto out;
	437	}
	438
	439	/* Remove trailing \n's and escape leading dots */
	440	trim_line(line);
	441
	442	/*
	443	* If the first character is a dot, we escape it so the line
	444	* length increases
	445	*/
	446	if (line[0] == '.')
	447	linelen++;
	448
	449	if (send_remote_command(fd, "%s", line) != (ssize_t)linelen+1) {
	450	syslog(LOG_ERR, "%s: remote delivery deferred: "
	451	"write error", it->queueid);
	452	error = 1;
	453	goto out;
	454	}
	455	}
	456
	457	send_remote_command(fd, ".");
bf28fcc6	458	if (read_remote(fd, 0, NULL) != 2) {
7a73c463 SS	459	syslog(LOG_ERR, "%s: remote delivery deferred: %s",
7a73c463 SS	460	it->queueid, neterr);
86e4d161 MS	461	return (1);
	462	}
	463
	464	send_remote_command(fd, "QUIT");
83f3cc40 SS	465	if (read_remote(fd, 0, NULL) != 2)
83f3cc40 SS	466	syslog(LOG_WARNING, "%s: remote delivery succeeded but "
7a73c463	467	"QUIT failed: %s", it->queueid, neterr);
86e4d161 MS	468	out:
	469
	470	close(fd);
	471	return (error);
	472	}
	473