2006-03-22 19:46:12 +00:00
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/*
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* Copyright (c) 2005 Reyk Floeter <reyk@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "includes.h"
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2006-09-30 13:29:51 +00:00
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netinet/ip.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdarg.h>
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2021-04-23 19:10:38 +00:00
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#include <stdio.h>
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2006-09-30 13:29:51 +00:00
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#include <string.h>
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#include <unistd.h>
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2008-07-23 09:33:08 +00:00
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#include "openbsd-compat/sys-queue.h"
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2006-03-22 19:46:12 +00:00
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#include "log.h"
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#include "misc.h"
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2015-07-02 13:15:34 +00:00
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#include "sshbuf.h"
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2006-09-30 13:29:51 +00:00
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#include "channels.h"
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2015-07-02 13:15:34 +00:00
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#include "ssherr.h"
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2006-03-22 19:46:12 +00:00
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2018-05-06 12:27:04 +00:00
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/*
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* This file contains various portability code for network support,
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* including tun/tap forwarding and routing domains.
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*/
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#if defined(SYS_RDOMAIN_LINUX) || defined(SSH_TUN_LINUX)
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#include <linux/if.h>
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#endif
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#if defined(SYS_RDOMAIN_LINUX)
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char *
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sys_get_rdomain(int fd)
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{
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char dev[IFNAMSIZ + 1];
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socklen_t len = sizeof(dev) - 1;
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if (getsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, dev, &len) == -1) {
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error("%s: cannot determine VRF for fd=%d : %s",
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__func__, fd, strerror(errno));
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return NULL;
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}
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dev[len] = '\0';
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return strdup(dev);
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}
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int
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sys_set_rdomain(int fd, const char *name)
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{
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if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE,
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name, strlen(name)) == -1) {
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error("%s: setsockopt(%d, SO_BINDTODEVICE, %s): %s",
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2021-04-23 19:13:32 +00:00
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__func__, fd, name, strerror(errno));
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2018-05-06 12:27:04 +00:00
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return -1;
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}
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return 0;
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}
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int
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sys_valid_rdomain(const char *name)
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{
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int fd;
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/*
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* This is a pretty crappy way to test. It would be better to
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* check whether "name" represents a VRF device, but apparently
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* that requires an rtnetlink transaction.
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*/
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if ((fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
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return 0;
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if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE,
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name, strlen(name)) == -1) {
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close(fd);
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return 0;
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}
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close(fd);
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return 1;
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}
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#elif defined(SYS_RDOMAIN_XXX)
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/* XXX examples */
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char *
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sys_get_rdomain(int fd)
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{
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return NULL;
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}
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int
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sys_set_rdomain(int fd, const char *name)
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{
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return -1;
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}
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int
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valid_rdomain(const char *name)
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{
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return 0;
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}
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void
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sys_set_process_rdomain(const char *name)
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{
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fatal("%s: not supported", __func__);
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}
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#endif /* defined(SYS_RDOMAIN_XXX) */
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2006-03-22 19:46:12 +00:00
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/*
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* This is the portable version of the SSH tunnel forwarding, it
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* uses some preprocessor definitions for various platform-specific
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* settings.
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*
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* SSH_TUN_LINUX Use the (newer) Linux tun/tap device
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2006-09-30 13:29:51 +00:00
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* SSH_TUN_FREEBSD Use the FreeBSD tun/tap device
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2006-03-22 19:46:12 +00:00
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* SSH_TUN_COMPAT_AF Translate the OpenBSD address family
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* SSH_TUN_PREPEND_AF Prepend/remove the address family
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*/
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/*
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* System-specific tunnel open function
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*/
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#if defined(SSH_TUN_LINUX)
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#include <linux/if_tun.h>
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2021-02-14 21:04:52 +00:00
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#define TUN_CTRL_DEV "/dev/net/tun"
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2006-03-22 19:46:12 +00:00
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int
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2018-05-06 12:27:04 +00:00
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sys_tun_open(int tun, int mode, char **ifname)
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2006-03-22 19:46:12 +00:00
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{
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struct ifreq ifr;
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int fd = -1;
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const char *name = NULL;
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2018-05-06 12:27:04 +00:00
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if (ifname != NULL)
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*ifname = NULL;
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2021-02-14 21:04:52 +00:00
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if ((fd = open(TUN_CTRL_DEV, O_RDWR)) == -1) {
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debug("%s: failed to open tunnel control device \"%s\": %s",
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__func__, TUN_CTRL_DEV, strerror(errno));
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2006-03-22 19:46:12 +00:00
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return (-1);
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}
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2017-01-31 12:33:47 +00:00
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bzero(&ifr, sizeof(ifr));
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2006-03-22 19:46:12 +00:00
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if (mode == SSH_TUNMODE_ETHERNET) {
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ifr.ifr_flags = IFF_TAP;
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name = "tap%d";
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} else {
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ifr.ifr_flags = IFF_TUN;
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name = "tun%d";
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}
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ifr.ifr_flags |= IFF_NO_PI;
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if (tun != SSH_TUNID_ANY) {
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if (tun > SSH_TUNID_MAX) {
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debug("%s: invalid tunnel id %x: %s", __func__,
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tun, strerror(errno));
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goto failed;
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}
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snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), name, tun);
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}
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if (ioctl(fd, TUNSETIFF, &ifr) == -1) {
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debug("%s: failed to configure tunnel (mode %d): %s", __func__,
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mode, strerror(errno));
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goto failed;
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}
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if (tun == SSH_TUNID_ANY)
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debug("%s: tunnel mode %d fd %d", __func__, mode, fd);
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else
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debug("%s: %s mode %d fd %d", __func__, ifr.ifr_name, mode, fd);
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2018-05-16 13:59:58 +00:00
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if (ifname != NULL && (*ifname = strdup(ifr.ifr_name)) == NULL)
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2018-05-06 12:27:04 +00:00
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goto failed;
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2006-03-22 19:46:12 +00:00
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return (fd);
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failed:
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close(fd);
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return (-1);
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}
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#endif /* SSH_TUN_LINUX */
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#ifdef SSH_TUN_FREEBSD
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#include <sys/socket.h>
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#include <net/if.h>
|
2006-09-30 13:29:51 +00:00
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#ifdef HAVE_NET_IF_TUN_H
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2006-03-22 19:46:12 +00:00
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#include <net/if_tun.h>
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2006-09-30 13:29:51 +00:00
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#endif
|
2006-03-22 19:46:12 +00:00
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int
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2018-05-06 12:27:04 +00:00
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sys_tun_open(int tun, int mode, char **ifname)
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2006-03-22 19:46:12 +00:00
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{
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struct ifreq ifr;
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char name[100];
|
2021-02-14 21:09:58 +00:00
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int fd = -1, sock;
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2006-03-22 19:46:12 +00:00
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const char *tunbase = "tun";
|
2021-02-14 21:09:58 +00:00
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#if defined(TUNSIFHEAD) && !defined(SSH_TUN_PREPEND_AF)
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int flag;
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#endif
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2006-03-22 19:46:12 +00:00
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|
2018-05-06 12:27:04 +00:00
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if (ifname != NULL)
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*ifname = NULL;
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2006-03-22 19:46:12 +00:00
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if (mode == SSH_TUNMODE_ETHERNET) {
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#ifdef SSH_TUN_NO_L2
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debug("%s: no layer 2 tunnelling support", __func__);
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return (-1);
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#else
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tunbase = "tap";
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#endif
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}
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/* Open the tunnel device */
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if (tun <= SSH_TUNID_MAX) {
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snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun);
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fd = open(name, O_RDWR);
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} else if (tun == SSH_TUNID_ANY) {
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for (tun = 100; tun >= 0; tun--) {
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snprintf(name, sizeof(name), "/dev/%s%d",
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tunbase, tun);
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if ((fd = open(name, O_RDWR)) >= 0)
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break;
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}
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} else {
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debug("%s: invalid tunnel %u\n", __func__, tun);
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return (-1);
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}
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if (fd < 0) {
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debug("%s: %s open failed: %s", __func__, name,
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strerror(errno));
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return (-1);
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}
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/* Turn on tunnel headers */
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#if defined(TUNSIFHEAD) && !defined(SSH_TUN_PREPEND_AF)
|
2021-02-14 21:09:58 +00:00
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flag = 1;
|
2006-03-22 19:46:12 +00:00
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if (mode != SSH_TUNMODE_ETHERNET &&
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ioctl(fd, TUNSIFHEAD, &flag) == -1) {
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debug("%s: ioctl(%d, TUNSIFHEAD, 1): %s", __func__, fd,
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strerror(errno));
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close(fd);
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}
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#endif
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debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
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/* Set the tunnel device operation mode */
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snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun);
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if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
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goto failed;
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if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1)
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goto failed;
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2010-11-08 10:45:44 +00:00
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if ((ifr.ifr_flags & IFF_UP) == 0) {
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ifr.ifr_flags |= IFF_UP;
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if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
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goto failed;
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}
|
2006-03-22 19:46:12 +00:00
|
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|
2018-05-16 13:59:58 +00:00
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if (ifname != NULL && (*ifname = strdup(ifr.ifr_name)) == NULL)
|
2018-05-06 12:27:04 +00:00
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goto failed;
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2006-03-22 19:46:12 +00:00
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close(sock);
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return (fd);
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failed:
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|
if (fd >= 0)
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close(fd);
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|
if (sock >= 0)
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close(sock);
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debug("%s: failed to set %s mode %d: %s", __func__, name,
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mode, strerror(errno));
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return (-1);
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|
|
|
}
|
|
|
|
#endif /* SSH_TUN_FREEBSD */
|
|
|
|
|
|
|
|
/*
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|
|
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* System-specific channel filters
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|
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|
*/
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|
|
|
|
|
|
|
#if defined(SSH_TUN_FILTER)
|
2018-05-06 12:24:45 +00:00
|
|
|
/*
|
|
|
|
* The tunnel forwarding protocol prepends the address family of forwarded
|
|
|
|
* IP packets using OpenBSD's numbers.
|
|
|
|
*/
|
2006-03-22 19:46:12 +00:00
|
|
|
#define OPENBSD_AF_INET 2
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|
|
|
#define OPENBSD_AF_INET6 24
|
|
|
|
|
|
|
|
int
|
2018-05-06 12:24:45 +00:00
|
|
|
sys_tun_infilter(struct ssh *ssh, struct Channel *c, char *buf, int _len)
|
2006-03-22 19:46:12 +00:00
|
|
|
{
|
2018-05-06 12:24:45 +00:00
|
|
|
int r;
|
|
|
|
size_t len;
|
|
|
|
char *ptr = buf;
|
2006-03-22 19:46:12 +00:00
|
|
|
#if defined(SSH_TUN_PREPEND_AF)
|
|
|
|
char rbuf[CHAN_RBUF];
|
2018-05-06 12:24:45 +00:00
|
|
|
struct ip iph;
|
2006-03-22 19:46:12 +00:00
|
|
|
#endif
|
2018-05-06 12:24:45 +00:00
|
|
|
#if defined(SSH_TUN_PREPEND_AF) || defined(SSH_TUN_COMPAT_AF)
|
|
|
|
u_int32_t af;
|
2006-03-22 19:46:12 +00:00
|
|
|
#endif
|
|
|
|
|
2018-05-06 12:24:45 +00:00
|
|
|
/* XXX update channel input filter API to use unsigned length */
|
|
|
|
if (_len < 0)
|
|
|
|
return -1;
|
|
|
|
len = _len;
|
2006-03-22 19:46:12 +00:00
|
|
|
|
2018-05-06 12:24:45 +00:00
|
|
|
#if defined(SSH_TUN_PREPEND_AF)
|
|
|
|
if (len <= sizeof(iph) || len > sizeof(rbuf) - 4)
|
|
|
|
return -1;
|
|
|
|
/* Determine address family from packet IP header. */
|
|
|
|
memcpy(&iph, buf, sizeof(iph));
|
|
|
|
af = iph.ip_v == 6 ? OPENBSD_AF_INET6 : OPENBSD_AF_INET;
|
|
|
|
/* Prepend address family to packet using OpenBSD constants */
|
|
|
|
memcpy(rbuf + 4, buf, len);
|
|
|
|
len += 4;
|
|
|
|
POKE_U32(rbuf, af);
|
|
|
|
ptr = rbuf;
|
|
|
|
#elif defined(SSH_TUN_COMPAT_AF)
|
|
|
|
/* Convert existing address family header to OpenBSD value */
|
|
|
|
if (len <= 4)
|
|
|
|
return -1;
|
|
|
|
af = PEEK_U32(buf);
|
|
|
|
/* Put it back */
|
|
|
|
POKE_U32(buf, af == AF_INET6 ? OPENBSD_AF_INET6 : OPENBSD_AF_INET);
|
2006-03-22 19:46:12 +00:00
|
|
|
#endif
|
|
|
|
|
2018-05-06 12:24:45 +00:00
|
|
|
if ((r = sshbuf_put_string(c->input, ptr, len)) != 0)
|
2015-07-02 13:15:34 +00:00
|
|
|
fatal("%s: buffer error: %s", __func__, ssh_err(r));
|
2006-03-22 19:46:12 +00:00
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
u_char *
|
2018-05-06 12:24:45 +00:00
|
|
|
sys_tun_outfilter(struct ssh *ssh, struct Channel *c,
|
|
|
|
u_char **data, size_t *dlen)
|
2006-03-22 19:46:12 +00:00
|
|
|
{
|
|
|
|
u_char *buf;
|
2018-05-06 12:24:45 +00:00
|
|
|
u_int32_t af;
|
2015-07-02 13:15:34 +00:00
|
|
|
int r;
|
|
|
|
|
|
|
|
/* XXX new API is incompatible with this signature. */
|
2018-05-06 12:24:45 +00:00
|
|
|
if ((r = sshbuf_get_string(c->output, data, dlen)) != 0)
|
2015-07-02 13:15:34 +00:00
|
|
|
fatal("%s: buffer error: %s", __func__, ssh_err(r));
|
2018-05-06 12:24:45 +00:00
|
|
|
if (*dlen < sizeof(af))
|
2006-03-22 19:46:12 +00:00
|
|
|
return (NULL);
|
|
|
|
buf = *data;
|
|
|
|
|
|
|
|
#if defined(SSH_TUN_PREPEND_AF)
|
2018-05-06 12:24:45 +00:00
|
|
|
/* skip address family */
|
|
|
|
*dlen -= sizeof(af);
|
|
|
|
buf = *data + sizeof(af);
|
2006-03-22 19:46:12 +00:00
|
|
|
#elif defined(SSH_TUN_COMPAT_AF)
|
2018-05-06 12:24:45 +00:00
|
|
|
/* translate address family */
|
|
|
|
af = (PEEK_U32(buf) == OPENBSD_AF_INET6) ? AF_INET6 : AF_INET;
|
|
|
|
POKE_U32(buf, af);
|
2006-03-22 19:46:12 +00:00
|
|
|
#endif
|
|
|
|
return (buf);
|
|
|
|
}
|
|
|
|
#endif /* SSH_TUN_FILTER */
|