[gssapi-openssh.git] / openssh / monitor_fdpass.c

/* $OpenBSD: monitor_fdpass.c,v 1.12 2006/08/03 03:34:42 deraadt Exp $ */
/*
 * Copyright 2001 Niels Provos <provos@citi.umich.edu>
 * All rights reserved.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

#include "includes.h"

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>

#include <errno.h>
#include <string.h>
#include <stdarg.h>

#include "log.h"
#include "monitor_fdpass.h"

void
mm_send_fd(int sock, int fd)
{
#if defined(HAVE_SENDMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))
	struct msghdr msg;
	struct iovec vec;
	char ch = '\0';
	ssize_t n;
#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
	char tmp[CMSG_SPACE(sizeof(int))];
	struct cmsghdr *cmsg;
#endif

	memset(&msg, 0, sizeof(msg));
#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
	msg.msg_accrights = (caddr_t)&fd;
	msg.msg_accrightslen = sizeof(fd);
#else
	msg.msg_control = (caddr_t)tmp;
	msg.msg_controllen = CMSG_LEN(sizeof(int));
	cmsg = CMSG_FIRSTHDR(&msg);
	cmsg->cmsg_len = CMSG_LEN(sizeof(int));
	cmsg->cmsg_level = SOL_SOCKET;
	cmsg->cmsg_type = SCM_RIGHTS;
	*(int *)CMSG_DATA(cmsg) = fd;
#endif

	vec.iov_base = &ch;
	vec.iov_len = 1;
	msg.msg_iov = &vec;
	msg.msg_iovlen = 1;

	if ((n = sendmsg(sock, &msg, 0)) == -1)
		fatal("%s: sendmsg(%d): %s", __func__, fd,
		    strerror(errno));
	if (n != 1)
		fatal("%s: sendmsg: expected sent 1 got %ld",
		    __func__, (long)n);
#else
	fatal("%s: UsePrivilegeSeparation=yes not supported",
	    __func__);
#endif
}

int
mm_receive_fd(int sock)
{
#if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))
	struct msghdr msg;
	struct iovec vec;
	ssize_t n;
	char ch;
	int fd;
#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
	char tmp[CMSG_SPACE(sizeof(int))];
	struct cmsghdr *cmsg;
#endif

	memset(&msg, 0, sizeof(msg));
	vec.iov_base = &ch;
	vec.iov_len = 1;
	msg.msg_iov = &vec;
	msg.msg_iovlen = 1;
#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
	msg.msg_accrights = (caddr_t)&fd;
	msg.msg_accrightslen = sizeof(fd);
#else
	msg.msg_control = tmp;
	msg.msg_controllen = sizeof(tmp);
#endif

	if ((n = recvmsg(sock, &msg, 0)) == -1)
		fatal("%s: recvmsg: %s", __func__, strerror(errno));
	if (n != 1)
		fatal("%s: recvmsg: expected received 1 got %ld",
		    __func__, (long)n);

#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
	if (msg.msg_accrightslen != sizeof(fd))
		fatal("%s: no fd", __func__);
#else
	cmsg = CMSG_FIRSTHDR(&msg);
	if (cmsg == NULL)
		fatal("%s: no message header", __func__);
#ifndef BROKEN_CMSG_TYPE
	if (cmsg->cmsg_type != SCM_RIGHTS)
		fatal("%s: expected type %d got %d", __func__,
		    SCM_RIGHTS, cmsg->cmsg_type);
#endif
	fd = (*(int *)CMSG_DATA(cmsg));
#endif
	return fd;
#else
	fatal("%s: UsePrivilegeSeparation=yes not supported",
	    __func__);
#endif
}
Commit	Line	Data
30460aeb	1	/* $OpenBSD: monitor_fdpass.c,v 1.12 2006/08/03 03:34:42 deraadt Exp $ */
826f3a39	2	/*
	3	* Copyright 2001 Niels Provos <provos@citi.umich.edu>
	4	* All rights reserved.
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	*
	15	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	16	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	17	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	18	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	19	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	20	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	21	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	22	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	23	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	24	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	25	*/
	26
	27	#include "includes.h"
826f3a39	28
30460aeb	29	#include <sys/types.h>
30460aeb	30	#include <sys/socket.h>
826f3a39	31	#include <sys/uio.h>
826f3a39	32
30460aeb	33	#include <errno.h>
	34	#include <string.h>
	35	#include <stdarg.h>
	36
826f3a39	37	#include "log.h"
	38	#include "monitor_fdpass.h"
	39
	40	void
7e82606e	41	mm_send_fd(int sock, int fd)
826f3a39	42	{
	43	#if defined(HAVE_SENDMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) \|\| defined(HAVE_CONTROL_IN_MSGHDR))
	44	struct msghdr msg;
	45	struct iovec vec;
	46	char ch = '\0';
d03f4262	47	ssize_t n;
541874c2	48	#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
826f3a39	49	char tmp[CMSG_SPACE(sizeof(int))];
	50	struct cmsghdr *cmsg;
	51	#endif
	52
	53	memset(&msg, 0, sizeof(msg));
541874c2	54	#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
826f3a39	55	msg.msg_accrights = (caddr_t)&fd;
	56	msg.msg_accrightslen = sizeof(fd);
	57	#else
	58	msg.msg_control = (caddr_t)tmp;
	59	msg.msg_controllen = CMSG_LEN(sizeof(int));
	60	cmsg = CMSG_FIRSTHDR(&msg);
	61	cmsg->cmsg_len = CMSG_LEN(sizeof(int));
	62	cmsg->cmsg_level = SOL_SOCKET;
	63	cmsg->cmsg_type = SCM_RIGHTS;
	64	(int )CMSG_DATA(cmsg) = fd;
	65	#endif
	66
	67	vec.iov_base = &ch;
	68	vec.iov_len = 1;
	69	msg.msg_iov = &vec;
	70	msg.msg_iovlen = 1;
	71
7e82606e	72	if ((n = sendmsg(sock, &msg, 0)) == -1)
44a053a3	73	fatal("%s: sendmsg(%d): %s", __func__, fd,
826f3a39	74	strerror(errno));
826f3a39	75	if (n != 1)
d03f4262	76	fatal("%s: sendmsg: expected sent 1 got %ld",
d03f4262	77	__func__, (long)n);
826f3a39	78	#else
826f3a39	79	fatal("%s: UsePrivilegeSeparation=yes not supported",
44a053a3	80	__func__);
826f3a39	81	#endif
	82	}
	83
	84	int
7e82606e	85	mm_receive_fd(int sock)
826f3a39	86	{
	87	#if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) \|\| defined(HAVE_CONTROL_IN_MSGHDR))
	88	struct msghdr msg;
	89	struct iovec vec;
d03f4262	90	ssize_t n;
826f3a39	91	char ch;
d03f4262	92	int fd;
541874c2	93	#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
826f3a39	94	char tmp[CMSG_SPACE(sizeof(int))];
	95	struct cmsghdr *cmsg;
	96	#endif
	97
	98	memset(&msg, 0, sizeof(msg));
	99	vec.iov_base = &ch;
	100	vec.iov_len = 1;
	101	msg.msg_iov = &vec;
	102	msg.msg_iovlen = 1;
541874c2	103	#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
826f3a39	104	msg.msg_accrights = (caddr_t)&fd;
	105	msg.msg_accrightslen = sizeof(fd);
	106	#else
	107	msg.msg_control = tmp;
	108	msg.msg_controllen = sizeof(tmp);
	109	#endif
	110
7e82606e	111	if ((n = recvmsg(sock, &msg, 0)) == -1)
44a053a3	112	fatal("%s: recvmsg: %s", __func__, strerror(errno));
826f3a39	113	if (n != 1)
d03f4262	114	fatal("%s: recvmsg: expected received 1 got %ld",
d03f4262	115	__func__, (long)n);
826f3a39	116
541874c2	117	#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
826f3a39	118	if (msg.msg_accrightslen != sizeof(fd))
44a053a3	119	fatal("%s: no fd", __func__);
826f3a39	120	#else
826f3a39	121	cmsg = CMSG_FIRSTHDR(&msg);
7e82606e	122	if (cmsg == NULL)
7e82606e	123	fatal("%s: no message header", __func__);
7cac2b65	124	#ifndef BROKEN_CMSG_TYPE
826f3a39	125	if (cmsg->cmsg_type != SCM_RIGHTS)
44a053a3	126	fatal("%s: expected type %d got %d", __func__,
826f3a39	127	SCM_RIGHTS, cmsg->cmsg_type);
7cac2b65	128	#endif
826f3a39	129	fd = ((int )CMSG_DATA(cmsg));
	130	#endif
	131	return fd;
	132	#else
	133	fatal("%s: UsePrivilegeSeparation=yes not supported",
44a053a3	134	__func__);
826f3a39	135	#endif
826f3a39	136	}