[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>

#include <openssl/ssl.h>

#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];
	size_t len, pos;
	int s;
	ssize_t n;

	va_start(va, fmt);
	s = vsnprintf(cmd, sizeof(cmd) - 2, fmt, va);
	va_end(va);
	if (s == sizeof(cmd) - 2 || s < 0)
		errx(1, "Internal error: oversized command string");
	/* We *know* there are at least two more bytes available */
	strcat(cmd, "\r\n");
	len = strlen(cmd);

	if (((config->features & SECURETRANS) != 0) &&
	    ((config->features & NOSSL) == 0)) {
		while ((s = SSL_write(config->ssl, (const char*)cmd, len)) <= 0) {
			s = SSL_get_error(config->ssl, s);
			if (s != SSL_ERROR_WANT_READ &&
			    s != SSL_ERROR_WANT_WRITE)
				return (-1);
		}
	}
	else {
		pos = 0;
		while (pos < len) {
			n = write(fd, cmd + pos, len - pos);
			if (n < 0)
				return (-1);
			pos += n;
		}
	}

	return (len);
}

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;

	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);
	}

	if ((config->features & INSECURE) != 0 ||
	    (config->features & SECURETRANS) != 0) {
		/* Send AUTH command according to RFC 2554 */
		send_remote_command(fd, "AUTH LOGIN");
		if (read_remote(fd, 0, NULL) != 3) {
			syslog(LOG_NOTICE, "%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_NOTICE, "%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_NOTICE, "%s: remote delivery failed:"
					" Authentication failed: %s",
					it->queueid, neterr);
			return (-1);
		} else if (res != 2) {
			syslog(LOG_NOTICE, "%s: remote delivery failed:"
					" AUTH password failed: %s",
					it->queueid, neterr);
			return (-1);
		}
	} else {
		syslog(LOG_WARNING, "%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_NOTICE, "%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_NOTICE, "%s: remote delivery deferred: %s (%s:%s)",
			it->queueid, errmsg, host, servname);
		freeaddrinfo(res0);
		return (-1);
	}
	freeaddrinfo(res0);
	return (fd);
}

static void
close_connection(int fd)
{
	if (((config->features & SECURETRANS) != 0) &&
	    ((config->features & NOSSL) == 0))
		SSL_shutdown(config->ssl);

	if (config->ssl != NULL)
		SSL_free(config->ssl);

	close(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;
	/* asprintf can't take const */
	void *errmsgc = __DECONST(char **, errmsg);

	host = strrchr(it->addr, '@');
	/* Should not happen */
	if (host == NULL) {
		asprintf(errmsgc, "Internal error: badly formed address %s",
		    it->addr);
		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_WARNING, "%s: Invalid initial response: %i",
			it->queueid, res);
		return(1);
	}
	config->features &= ~NOSSL;

	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;
	}

	send_remote_command(fd, "EHLO %s", hostname());
	if (read_remote(fd, 0, NULL) != 2) {
		syslog(LOG_WARNING, "%s: remote delivery deferred: "
		       " EHLO failed: %s", it->queueid, neterr);
		asprintf(errmsgc, "%s did not like our EHLO:\n%s",
		    host, 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);
			asprintf(errmsgc, "SMTP login to %s failed", host);
			return (-1);
		}
		/* SMTP login is not available, so try without */
		else if (error > 0)
			syslog(LOG_WARNING, "%s: SMTP login not available."
					" Try without", it->queueid);
	}

#define READ_REMOTE_CHECK(c, exp)	\
	res = read_remote(fd, 0, NULL); \
	if (res == 5) { \
		syslog(LOG_ERR, "%s: remote delivery failed: " \
		       c " failed: %s", it->queueid, neterr); \
		asprintf(errmsgc, "%s did not like our " c ":\n%s", \
		    host, neterr); \
		return (-1); \
	} else if (res != exp) { \
		syslog(LOG_NOTICE, "%s: remote delivery deferred: " \
		       c " failed: %s", it->queueid, neterr); \
		return (1); \
	}

	send_remote_command(fd, "MAIL FROM:<%s>", it->sender);
	READ_REMOTE_CHECK("MAIL FROM", 2);

	send_remote_command(fd, "RCPT TO:<%s>", it->addr);
	READ_REMOTE_CHECK("RCPT TO", 2);

	send_remote_command(fd, "DATA");
	READ_REMOTE_CHECK("DATA", 3);

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

	error = 0;
	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_NOTICE, "%s: remote delivery deferred: "
				"write error", it->queueid);
			error = 1;
			goto out;
		}
	}

	send_remote_command(fd, ".");
	READ_REMOTE_CHECK("final DATA", 2);

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

	close_connection(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
86e4d161	46	#include <openssl/ssl.h>
86e4d161	47
c507d897	48	#include <err.h>
7a73c463	49	#include <errno.h>
86e4d161 MS	50	#include <netdb.h>
	51	#include <setjmp.h>
	52	#include <signal.h>
	53	#include <syslog.h>
	54	#include <unistd.h>
	55
	56	#include "dma.h"
	57
	58	extern struct config *config;
	59	extern struct authusers authusers;
	60	static jmp_buf timeout_alarm;
7a73c463	61	char neterr[BUF_SIZE];
86e4d161 MS	62
86e4d161 MS	63	static void
65bec70e	64	sig_alarm(int signo __unused)
86e4d161 MS	65	{
	66	longjmp(timeout_alarm, 1);
	67	}
	68
	69	ssize_t
	70	send_remote_command(int fd, const char* fmt, ...)
	71	{
	72	va_list va;
	73	char cmd[4096];
5b84c25b SS	74	size_t len, pos;
	75	int s;
	76	ssize_t n;
86e4d161 MS	77
86e4d161 MS	78	va_start(va, fmt);
5b84c25b SS	79	s = vsnprintf(cmd, sizeof(cmd) - 2, fmt, va);
	80	va_end(va);
	81	if (s == sizeof(cmd) - 2 \|\| s < 0)
	82	errx(1, "Internal error: oversized command string");
	83	/* We know there are at least two more bytes available */
	84	strcat(cmd, "\r\n");
	85	len = strlen(cmd);
86e4d161 MS	86
86e4d161 MS	87	if (((config->features & SECURETRANS) != 0) &&
50c8e68a	88	((config->features & NOSSL) == 0)) {
5b84c25b SS	89	while ((s = SSL_write(config->ssl, (const char*)cmd, len)) <= 0) {
	90	s = SSL_get_error(config->ssl, s);
	91	if (s != SSL_ERROR_WANT_READ &&
	92	s != SSL_ERROR_WANT_WRITE)
	93	return (-1);
	94	}
86e4d161 MS	95	}
86e4d161 MS	96	else {
5b84c25b SS	97	pos = 0;
	98	while (pos < len) {
	99	n = write(fd, cmd + pos, len - pos);
	100	if (n < 0)
	101	return (-1);
	102	pos += n;
	103	}
86e4d161	104	}
86e4d161	105
5b84c25b	106	return (len);
86e4d161 MS	107	}
86e4d161 MS	108
50c8e68a	109	int
bf28fcc6	110	read_remote(int fd, int extbufsize, char *extbuf)
86e4d161	111	{
50c8e68a MS	112	ssize_t rlen = 0;
	113	size_t pos, len;
	114	char buff[BUF_SIZE];
bf28fcc6	115	int done = 0, status = 0, extbufpos = 0;
86e4d161 MS	116
86e4d161 MS	117	if (signal(SIGALRM, sig_alarm) == SIG_ERR) {
7a73c463 SS	118	snprintf(neterr, sizeof(neterr), "SIGALRM error: %s",
	119	strerror(errno));
	120	return (1);
86e4d161 MS	121	}
86e4d161 MS	122	if (setjmp(timeout_alarm) != 0) {
7a73c463	123	snprintf(neterr, sizeof(neterr), "Timeout reached");
86e4d161 MS	124	return (1);
	125	}
	126	alarm(CON_TIMEOUT);
	127
	128	/*
50c8e68a MS	129	* Remote reading code from femail.c written by Henning Brauer of
50c8e68a MS	130	* OpenBSD and released under a BSD style license.
86e4d161	131	*/
50c8e68a	132	for (len = pos = 0; !done; ) {
bf28fcc6	133	rlen = 0;
50c8e68a MS	134	if (pos == 0 \|\|
	135	(pos > 0 && memchr(buff + pos, '\n', len - pos) == NULL)) {
	136	memmove(buff, buff + pos, len - pos);
	137	len -= pos;
	138	pos = 0;
	139	if (((config->features & SECURETRANS) != 0) &&
	140	(config->features & NOSSL) == 0) {
	141	if ((rlen = SSL_read(config->ssl, buff + len,
	142	sizeof(buff) - len)) == -1)
	143	err(1, "read");
	144	} else {
	145	if ((rlen = read(fd, buff + len,
	146	sizeof(buff) - len)) == -1)
	147	err(1, "read");
	148	}
	149	len += rlen;
	150	}
bf28fcc6 MS	151	/*
	152	* If there is an external buffer with a size bigger than zero
	153	* and as long as there is space in the external buffer and
	154	* there are new characters read from the mailserver
	155	* copy them to the external buffer
	156	*/
	157	if (extbufpos <= (extbufsize - 1) && rlen && extbufsize > 0
	158	&& extbuf != NULL) {
	159	/* do not write over the bounds of the buffer */
	160	if(extbufpos + rlen > (extbufsize - 1)) {
	161	rlen = extbufsize - extbufpos;
	162	}
	163	memcpy(extbuf + extbufpos, buff + len - rlen, rlen);
	164	extbufpos += rlen;
	165	}
50c8e68a MS	166	for (; pos < len && buff[pos] >= '0' && buff[pos] <= '9'; pos++)
50c8e68a MS	167	; /* Do nothing */
86e4d161	168
50c8e68a MS	169	if (pos == len)
50c8e68a MS	170	return (0);
86e4d161	171
50c8e68a MS	172	if (buff[pos] == ' ')
	173	done = 1;
	174	else if (buff[pos] != '-')
	175	syslog(LOG_ERR, "invalid syntax in reply from server");
86e4d161	176
50c8e68a MS	177	/* skip up to \n */
	178	for (; pos < len && buff[pos - 1] != '\n'; pos++)
	179	; /* Do nothing */
86e4d161	180
86e4d161	181	}
50c8e68a MS	182	alarm(0);
50c8e68a MS	183
7a73c463 SS	184	buff[len] = '\0';
	185	while (len > 0 && (buff[len - 1] == '\r' \|\| buff[len - 1] == '\n'))
	186	buff[--len] = '\0';
	187	snprintf(neterr, sizeof(neterr), "%s", buff);
50c8e68a MS	188	status = atoi(buff);
50c8e68a MS	189	return (status/100);
86e4d161 MS	190	}
	191
	192	/*
	193	* Handle SMTP authentication
86e4d161 MS	194	*/
	195	static int
	196	smtp_login(struct qitem it, int fd, char login, char* password)
	197	{
86e4d161	198	char *temp;
50c8e68a	199	int len, res = 0;
86e4d161	200
bf28fcc6 MS	201	res = smtp_auth_md5(it, fd, login, password);
	202	if (res == 0) {
	203	return (0);
	204	} else if (res == -2) {
	205	/*
	206	* If the return code is -2, then then the login attempt failed,
	207	* do not try other login mechanisms
	208	*/
	209	return (-1);
86e4d161 MS	210	}
86e4d161 MS	211
994b9c06 SS	212	if ((config->features & INSECURE) != 0 \|\|
994b9c06 SS	213	(config->features & SECURETRANS) != 0) {
bf28fcc6 MS	214	/* Send AUTH command according to RFC 2554 */
	215	send_remote_command(fd, "AUTH LOGIN");
	216	if (read_remote(fd, 0, NULL) != 3) {
791d1a91	217	syslog(LOG_NOTICE, "%s: remote delivery deferred:"
7a73c463 SS	218	" AUTH login not available: %s",
7a73c463 SS	219	it->queueid, neterr);
bf28fcc6 MS	220	return (1);
bf28fcc6 MS	221	}
86e4d161	222
bf28fcc6 MS	223	len = base64_encode(login, strlen(login), &temp);
	224	if (len <= 0)
	225	return (-1);
86e4d161	226
bf28fcc6 MS	227	send_remote_command(fd, "%s", temp);
bf28fcc6 MS	228	if (read_remote(fd, 0, NULL) != 3) {
791d1a91	229	syslog(LOG_NOTICE, "%s: remote delivery deferred:"
7a73c463 SS	230	" AUTH login failed: %s", it->queueid,
7a73c463 SS	231	neterr);
bf28fcc6 MS	232	return (-1);
bf28fcc6 MS	233	}
86e4d161	234
bf28fcc6 MS	235	len = base64_encode(password, strlen(password), &temp);
	236	if (len <= 0)
	237	return (-1);
	238
	239	send_remote_command(fd, "%s", temp);
	240	res = read_remote(fd, 0, NULL);
	241	if (res == 5) {
791d1a91	242	syslog(LOG_NOTICE, "%s: remote delivery failed:"
7a73c463 SS	243	" Authentication failed: %s",
7a73c463 SS	244	it->queueid, neterr);
bf28fcc6 MS	245	return (-1);
bf28fcc6 MS	246	} else if (res != 2) {
791d1a91	247	syslog(LOG_NOTICE, "%s: remote delivery failed:"
7a73c463 SS	248	" AUTH password failed: %s",
7a73c463 SS	249	it->queueid, neterr);
bf28fcc6 MS	250	return (-1);
	251	}
	252	} else {
791d1a91	253	syslog(LOG_WARNING, "%s: non-encrypted SMTP login is disabled in config, so skipping it. ",
bf28fcc6 MS	254	it->queueid);
bf28fcc6 MS	255	return (1);
86e4d161 MS	256	}
	257
	258	return (0);
	259	}
	260
	261	static int
	262	open_connection(struct qitem it, const char host)
	263	{
86e4d161 MS	264	struct addrinfo hints, res, res0;
	265	char servname[128];
	266	const char *errmsg = NULL;
86e4d161 MS	267	int fd, error = 0, port;
86e4d161 MS	268
65bec70e	269	if (config->port != 0)
86e4d161 MS	270	port = config->port;
	271	else
	272	port = SMTP_PORT;
	273
bf28fcc6	274	/* FIXME get MX record of host */
86e4d161 MS	275	/* Shamelessly taken from getaddrinfo(3) */
	276	memset(&hints, 0, sizeof(hints));
	277	hints.ai_family = PF_UNSPEC;
	278	hints.ai_socktype = SOCK_STREAM;
	279	hints.ai_protocol = IPPROTO_TCP;
	280
	281	snprintf(servname, sizeof(servname), "%d", port);
	282	error = getaddrinfo(host, servname, &hints, &res0);
	283	if (error) {
791d1a91	284	syslog(LOG_NOTICE, "%s: remote delivery deferred: "
86e4d161 MS	285	"%s: %m", it->queueid, gai_strerror(error));
	286	return (-1);
	287	}
	288	fd = -1;
	289	for (res = res0; res; res = res->ai_next) {
	290	fd=socket(res->ai_family, res->ai_socktype, res->ai_protocol);
	291	if (fd < 0) {
	292	errmsg = "socket failed";
	293	continue;
	294	}
	295	if (connect(fd, res->ai_addr, res->ai_addrlen) < 0) {
	296	errmsg = "connect failed";
	297	close(fd);
	298	fd = -1;
	299	continue;
	300	}
	301	break;
	302	}
	303	if (fd < 0) {
791d1a91	304	syslog(LOG_NOTICE, "%s: remote delivery deferred: %s (%s:%s)",
86e4d161 MS	305	it->queueid, errmsg, host, servname);
	306	freeaddrinfo(res0);
	307	return (-1);
	308	}
	309	freeaddrinfo(res0);
86e4d161 MS	310	return (fd);
	311	}
	312
8c365457 SS	313	static void
	314	close_connection(int fd)
	315	{
	316	if (((config->features & SECURETRANS) != 0) &&
	317	((config->features & NOSSL) == 0))
	318	SSL_shutdown(config->ssl);
	319
	320	if (config->ssl != NULL)
	321	SSL_free(config->ssl);
	322
	323	close(fd);
	324	}
	325
86e4d161	326	int
09da7b5e	327	deliver_remote(struct qitem it, const char *errmsg)
86e4d161 MS	328	{
86e4d161 MS	329	struct authuser *a;
50c8e68a MS	330	char *host, line[1000];
50c8e68a MS	331	int fd, error = 0, do_auth = 0, res = 0;
86e4d161	332	size_t linelen;
09da7b5e SS	333	/* asprintf can't take const */
09da7b5e SS	334	void errmsgc = __DECONST(char *, errmsg);
86e4d161 MS	335
	336	host = strrchr(it->addr, '@');
	337	/* Should not happen */
a43346d5	338	if (host == NULL) {
09da7b5e	339	asprintf(errmsgc, "Internal error: badly formed address %s",
a43346d5	340	it->addr);
86e4d161	341	return(-1);
a43346d5	342	} else {
86e4d161 MS	343	/* Step over the @ */
86e4d161 MS	344	host++;
a43346d5	345	}
86e4d161 MS	346
	347	/* Smarthost support? */
	348	if (config->smarthost != NULL && strlen(config->smarthost) > 0) {
e0a95d28 MS	349	syslog(LOG_INFO, "%s: using smarthost (%s:%i)",
e0a95d28 MS	350	it->queueid, config->smarthost, config->port);
86e4d161 MS	351	host = config->smarthost;
	352	}
	353
	354	fd = open_connection(it, host);
	355	if (fd < 0)
e0a95d28	356	return (1);
86e4d161	357
50c8e68a MS	358	/* Check first reply from remote host */
50c8e68a MS	359	config->features \|= NOSSL;
bf28fcc6	360	res = read_remote(fd, 0, NULL);
50c8e68a	361	if (res != 2) {
791d1a91	362	syslog(LOG_WARNING, "%s: Invalid initial response: %i",
50c8e68a MS	363	it->queueid, res);
	364	return(1);
	365	}
	366	config->features &= ~NOSSL;
	367
86e4d161 MS	368	if ((config->features & SECURETRANS) != 0) {
	369	error = smtp_init_crypto(it, fd, config->features);
	370	if (error >= 0)
40234162	371	syslog(LOG_INFO, "%s: SSL initialization successful",
86e4d161 MS	372	it->queueid);
	373	else
	374	goto out;
	375	}
f3105067 SS	376
	377	send_remote_command(fd, "EHLO %s", hostname());
	378	if (read_remote(fd, 0, NULL) != 2) {
791d1a91	379	syslog(LOG_WARNING, "%s: remote delivery deferred: "
f3105067 SS	380	" EHLO failed: %s", it->queueid, neterr);
	381	asprintf(errmsgc, "%s did not like our EHLO:\n%s",
	382	host, neterr);
	383	return (-1);
86e4d161 MS	384	}
	385
	386	/*
	387	* Use SMTP authentication if the user defined an entry for the remote
	388	* or smarthost
	389	*/
	390	SLIST_FOREACH(a, &authusers, next) {
	391	if (strcmp(a->host, host) == 0) {
	392	do_auth = 1;
	393	break;
	394	}
	395	}
	396
	397	if (do_auth == 1) {
dfce7456 MS	398	/*
	399	* Check if the user wants plain text login without using
	400	* encryption.
	401	*/
bf28fcc6	402	syslog(LOG_INFO, "%s: Use SMTP authentication",
86e4d161	403	it->queueid);
bf28fcc6 MS	404	error = smtp_login(it, fd, a->login, a->password);
	405	if (error < 0) {
	406	syslog(LOG_ERR, "%s: remote delivery failed:"
dfce7456	407	" SMTP login failed: %m", it->queueid);
09da7b5e	408	asprintf(errmsgc, "SMTP login to %s failed", host);
e0a95d28	409	return (-1);
dfce7456	410	}
bf28fcc6 MS	411	/* SMTP login is not available, so try without */
bf28fcc6 MS	412	else if (error > 0)
791d1a91	413	syslog(LOG_WARNING, "%s: SMTP login not available."
bf28fcc6	414	" Try without", it->queueid);
86e4d161 MS	415	}
86e4d161 MS	416
c68aff7a SS	417	#define READ_REMOTE_CHECK(c, exp) \
	418	res = read_remote(fd, 0, NULL); \
	419	if (res == 5) { \
	420	syslog(LOG_ERR, "%s: remote delivery failed: " \
	421	c " failed: %s", it->queueid, neterr); \
09da7b5e	422	asprintf(errmsgc, "%s did not like our " c ":\n%s", \
a43346d5	423	host, neterr); \
c68aff7a SS	424	return (-1); \
c68aff7a SS	425	} else if (res != exp) { \
791d1a91	426	syslog(LOG_NOTICE, "%s: remote delivery deferred: " \
c68aff7a SS	427	c " failed: %s", it->queueid, neterr); \
c68aff7a SS	428	return (1); \
86e4d161 MS	429	}
86e4d161 MS	430
c68aff7a SS	431	send_remote_command(fd, "MAIL FROM:<%s>", it->sender);
	432	READ_REMOTE_CHECK("MAIL FROM", 2);
	433
e0a95d28	434	send_remote_command(fd, "RCPT TO:<%s>", it->addr);
c68aff7a	435	READ_REMOTE_CHECK("RCPT TO", 2);
86e4d161 MS	436
86e4d161 MS	437	send_remote_command(fd, "DATA");
c68aff7a	438	READ_REMOTE_CHECK("DATA", 3);
86e4d161 MS	439
86e4d161 MS	440	if (fseek(it->queuef, it->hdrlen, SEEK_SET) != 0) {
7a73c463 SS	441	syslog(LOG_ERR, "%s: remote delivery deferred: cannot seek: %s",
7a73c463 SS	442	it->queueid, neterr);
86e4d161 MS	443	return (1);
	444	}
	445
3a7b3ec9	446	error = 0;
86e4d161 MS	447	while (!feof(it->queuef)) {
	448	if (fgets(line, sizeof(line), it->queuef) == NULL)
	449	break;
	450	linelen = strlen(line);
	451	if (linelen == 0 \|\| line[linelen - 1] != '\n') {
	452	syslog(LOG_CRIT, "%s: remote delivery failed:"
	453	"corrupted queue file", it->queueid);
09da7b5e	454	*errmsg = "corrupted queue file";
86e4d161 MS	455	error = -1;
	456	goto out;
	457	}
	458
	459	/* Remove trailing \n's and escape leading dots */
	460	trim_line(line);
	461
	462	/*
	463	* If the first character is a dot, we escape it so the line
	464	* length increases
	465	*/
	466	if (line[0] == '.')
	467	linelen++;
	468
	469	if (send_remote_command(fd, "%s", line) != (ssize_t)linelen+1) {
791d1a91	470	syslog(LOG_NOTICE, "%s: remote delivery deferred: "
86e4d161 MS	471	"write error", it->queueid);
	472	error = 1;
	473	goto out;
	474	}
	475	}
	476
	477	send_remote_command(fd, ".");
c68aff7a	478	READ_REMOTE_CHECK("final DATA", 2);
86e4d161 MS	479
86e4d161 MS	480	send_remote_command(fd, "QUIT");
83f3cc40	481	if (read_remote(fd, 0, NULL) != 2)
791d1a91	482	syslog(LOG_INFO, "%s: remote delivery succeeded but "
7a73c463	483	"QUIT failed: %s", it->queueid, neterr);
86e4d161 MS	484	out:
86e4d161 MS	485
8c365457	486	close_connection(fd);
86e4d161 MS	487	return (error);
	488	}
	489