[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>
#ifdef HAVE_SYS_UN_H
#include <sys/un.h>
#endif

#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
9108f8d9	1	/* $OpenBSD: monitor_fdpass.c,v 1.12 2006/08/03 03:34:42 deraadt Exp $ */
700318f3	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"
700318f3	28
9108f8d9	29	#include <sys/types.h>
9108f8d9	30	#include <sys/socket.h>
700318f3	31	#include <sys/uio.h>
ff7ec503	32	#ifdef HAVE_SYS_UN_H
	33	#include <sys/un.h>
	34	#endif
700318f3	35
9108f8d9	36	#include <errno.h>
	37	#include <string.h>
	38	#include <stdarg.h>
	39
700318f3	40	#include "log.h"
	41	#include "monitor_fdpass.h"
	42
	43	void
c9f39d2c	44	mm_send_fd(int sock, int fd)
700318f3	45	{
	46	#if defined(HAVE_SENDMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) \|\| defined(HAVE_CONTROL_IN_MSGHDR))
	47	struct msghdr msg;
	48	struct iovec vec;
	49	char ch = '\0';
41b2f314	50	ssize_t n;
fba3c309	51	#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
700318f3	52	char tmp[CMSG_SPACE(sizeof(int))];
	53	struct cmsghdr *cmsg;
	54	#endif
	55
	56	memset(&msg, 0, sizeof(msg));
fba3c309	57	#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
700318f3	58	msg.msg_accrights = (caddr_t)&fd;
	59	msg.msg_accrightslen = sizeof(fd);
	60	#else
	61	msg.msg_control = (caddr_t)tmp;
	62	msg.msg_controllen = CMSG_LEN(sizeof(int));
	63	cmsg = CMSG_FIRSTHDR(&msg);
	64	cmsg->cmsg_len = CMSG_LEN(sizeof(int));
	65	cmsg->cmsg_level = SOL_SOCKET;
	66	cmsg->cmsg_type = SCM_RIGHTS;
	67	(int )CMSG_DATA(cmsg) = fd;
	68	#endif
	69
	70	vec.iov_base = &ch;
	71	vec.iov_len = 1;
	72	msg.msg_iov = &vec;
	73	msg.msg_iovlen = 1;
	74
c9f39d2c	75	if ((n = sendmsg(sock, &msg, 0)) == -1)
f5799ae1	76	fatal("%s: sendmsg(%d): %s", __func__, fd,
700318f3	77	strerror(errno));
700318f3	78	if (n != 1)
41b2f314	79	fatal("%s: sendmsg: expected sent 1 got %ld",
41b2f314	80	__func__, (long)n);
700318f3	81	#else
700318f3	82	fatal("%s: UsePrivilegeSeparation=yes not supported",
f5799ae1	83	__func__);
700318f3	84	#endif
	85	}
	86
	87	int
c9f39d2c	88	mm_receive_fd(int sock)
700318f3	89	{
	90	#if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) \|\| defined(HAVE_CONTROL_IN_MSGHDR))
	91	struct msghdr msg;
	92	struct iovec vec;
41b2f314	93	ssize_t n;
700318f3	94	char ch;
41b2f314	95	int fd;
fba3c309	96	#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
700318f3	97	char tmp[CMSG_SPACE(sizeof(int))];
	98	struct cmsghdr *cmsg;
	99	#endif
	100
	101	memset(&msg, 0, sizeof(msg));
	102	vec.iov_base = &ch;
	103	vec.iov_len = 1;
	104	msg.msg_iov = &vec;
	105	msg.msg_iovlen = 1;
fba3c309	106	#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
700318f3	107	msg.msg_accrights = (caddr_t)&fd;
	108	msg.msg_accrightslen = sizeof(fd);
	109	#else
	110	msg.msg_control = tmp;
	111	msg.msg_controllen = sizeof(tmp);
	112	#endif
	113
c9f39d2c	114	if ((n = recvmsg(sock, &msg, 0)) == -1)
f5799ae1	115	fatal("%s: recvmsg: %s", __func__, strerror(errno));
700318f3	116	if (n != 1)
41b2f314	117	fatal("%s: recvmsg: expected received 1 got %ld",
41b2f314	118	__func__, (long)n);
700318f3	119
fba3c309	120	#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
700318f3	121	if (msg.msg_accrightslen != sizeof(fd))
f5799ae1	122	fatal("%s: no fd", __func__);
700318f3	123	#else
700318f3	124	cmsg = CMSG_FIRSTHDR(&msg);
c9f39d2c	125	if (cmsg == NULL)
c9f39d2c	126	fatal("%s: no message header", __func__);
0fff78ff	127	#ifndef BROKEN_CMSG_TYPE
700318f3	128	if (cmsg->cmsg_type != SCM_RIGHTS)
f5799ae1	129	fatal("%s: expected type %d got %d", __func__,
700318f3	130	SCM_RIGHTS, cmsg->cmsg_type);
0fff78ff	131	#endif
700318f3	132	fd = ((int )CMSG_DATA(cmsg));
	133	#endif
	134	return fd;
	135	#else
	136	fatal("%s: UsePrivilegeSeparation=yes not supported",
f5799ae1	137	__func__);
700318f3	138	#endif
700318f3	139	}