- reyk@cvs.openbsd.org 2005/12/08 18:34:11
[auth-options.c includes.h misc.c misc.h readconf.c servconf.c]
[serverloop.c ssh.c ssh_config.5 sshd_config.5 configure.ac]
two changes to the new ssh tunnel support. this breaks compatibility
with the initial commit but is required for a portable approach.
- make the tunnel id u_int and platform friendly, use predefined types.
- support configuration of layer 2 (ethernet) or layer 3
(point-to-point, default) modes. configuration is done using the
Tunnel (yes|point-to-point|ethernet|no) option is ssh_config(5) and
restricted by the PermitTunnel (yes|point-to-point|ethernet|no) option
in sshd_config(5).
ok djm@, man page bits by jmc@
This commit is contained in:
Damien Miller
parent
957d4e430e
commit
7b58e80036
14
ChangeLog
14
ChangeLog
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@ -36,6 +36,18 @@
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- jmc@cvs.openbsd.org 2005/12/08 15:06:29
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[ssh_config.5]
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keep options in order;
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- reyk@cvs.openbsd.org 2005/12/08 18:34:11
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[auth-options.c includes.h misc.c misc.h readconf.c servconf.c]
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[serverloop.c ssh.c ssh_config.5 sshd_config.5 configure.ac]
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two changes to the new ssh tunnel support. this breaks compatibility
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with the initial commit but is required for a portable approach.
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- make the tunnel id u_int and platform friendly, use predefined types.
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- support configuration of layer 2 (ethernet) or layer 3
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(point-to-point, default) modes. configuration is done using the
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Tunnel (yes|point-to-point|ethernet|no) option is ssh_config(5) and
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restricted by the PermitTunnel (yes|point-to-point|ethernet|no) option
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in sshd_config(5).
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ok djm@, man page bits by jmc@
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20051201
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- (djm) [envpass.sh] Remove regress script that was accidentally committed
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@ -3428,4 +3440,4 @@
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- (djm) Trim deprecated options from INSTALL. Mention UsePAM
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- (djm) Fix quote handling in sftp; Patch from admorten AT umich.edu
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$Id: ChangeLog,v 1.4023 2005/12/13 08:30:45 djm Exp $
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$Id: ChangeLog,v 1.4024 2005/12/13 08:33:19 djm Exp $
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@ -10,7 +10,7 @@
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*/
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#include "includes.h"
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RCSID("$OpenBSD: auth-options.c,v 1.32 2005/12/06 22:38:27 reyk Exp $");
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RCSID("$OpenBSD: auth-options.c,v 1.33 2005/12/08 18:34:11 reyk Exp $");
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#include "xmalloc.h"
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#include "match.h"
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@ -296,7 +296,7 @@ auth_parse_options(struct passwd *pw, char *opts, char *file, u_long linenum)
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tun[i] = 0;
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forced_tun_device = a2tun(tun, NULL);
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xfree(tun);
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if (forced_tun_device < -1) {
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if (forced_tun_device == SSH_TUNID_ERR) {
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debug("%.100s, line %lu: invalid tun device",
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file, linenum);
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auth_debug_add("%.100s, line %lu: invalid tun device",
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@ -1,4 +1,4 @@
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# $Id: configure.ac,v 1.312 2005/11/29 02:40:34 tim Exp $
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# $Id: configure.ac,v 1.313 2005/12/13 08:33:20 djm Exp $
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#
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# Copyright (c) 1999-2004 Damien Miller
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#
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@ -654,6 +654,7 @@ AC_CHECK_HEADERS( \
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login_cap.h \
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maillock.h \
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ndir.h \
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net/if.h \
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netdb.h \
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netgroup.h \
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netinet/in_systm.h \
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@ -1,4 +1,4 @@
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/* $OpenBSD: includes.h,v 1.20 2005/11/15 11:59:54 millert Exp $ */
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/* $OpenBSD: includes.h,v 1.21 2005/12/08 18:34:11 reyk Exp $ */
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/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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@ -148,6 +148,9 @@ static /**/const char *const rcsid[] = { (const char *)rcsid, "\100(#)" msg }
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#include <netinet/in.h> /* For IPv6 macros */
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#include <netinet/ip.h> /* For IPTOS macros */
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#include <netinet/tcp.h>
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#ifdef HAVE_NET_IF_H
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# include <net/if.h>
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#endif
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#include <arpa/inet.h>
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#if defined(HAVE_NETDB_H)
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# include <netdb.h>
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75
misc.c
75
misc.c
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@ -24,7 +24,7 @@
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*/
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#include "includes.h"
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RCSID("$OpenBSD: misc.c,v 1.36 2005/12/06 22:38:27 reyk Exp $");
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RCSID("$OpenBSD: misc.c,v 1.37 2005/12/08 18:34:11 reyk Exp $");
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#include "misc.h"
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#include "log.h"
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@ -202,7 +202,7 @@ a2tun(const char *s, int *remote)
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int tun;
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if (remote != NULL) {
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*remote = -1;
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*remote = SSH_TUNID_ANY;
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sp = xstrdup(s);
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if ((ep = strchr(sp, ':')) == NULL) {
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xfree(sp);
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@ -212,15 +212,15 @@ a2tun(const char *s, int *remote)
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*remote = a2tun(ep, NULL);
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tun = a2tun(sp, NULL);
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xfree(sp);
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return (tun);
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return (*remote == SSH_TUNID_ERR ? *remote : tun);
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}
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if (strcasecmp(s, "any") == 0)
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return (-1);
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return (SSH_TUNID_ANY);
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tun = strtonum(s, 0, INT_MAX, &errstr);
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if (errstr != NULL || tun < -1)
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return (-2);
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tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
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if (errstr != NULL)
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return (SSH_TUNID_ERR);
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return (tun);
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}
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@ -539,27 +539,60 @@ read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz,
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}
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int
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tun_open(int tun)
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tun_open(int tun, int mode)
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{
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struct ifreq ifr;
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char name[100];
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int i, fd;
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int fd = -1, sock;
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if (tun > -1) {
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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/tun%d", tun);
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if ((fd = open(name, O_RDWR)) >= 0) {
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debug("%s: %s: %d", __func__, name, fd);
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return (fd);
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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/tun%d", 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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for (i = 100; i >= 0; i--) {
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snprintf(name, sizeof(name), "/dev/tun%d", i);
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if ((fd = open(name, O_RDWR)) >= 0) {
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debug("%s: %s: %d", __func__, name, fd);
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return (fd);
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}
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}
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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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debug("%s: %s failed: %s", __func__, name, strerror(errno));
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if (fd < 0) {
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debug("%s: %s open failed: %s", __func__, name, strerror(errno));
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return (-1);
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}
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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), "tun%d", 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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if (mode == SSH_TUNMODE_ETHERNET) {
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ifr.ifr_flags |= IFF_LINK0;
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if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
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goto failed;
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}
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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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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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}
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16
misc.h
16
misc.h
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@ -1,4 +1,4 @@
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/* $OpenBSD: misc.h,v 1.27 2005/12/06 22:38:27 reyk Exp $ */
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/* $OpenBSD: misc.h,v 1.28 2005/12/08 18:34:11 reyk Exp $ */
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/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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@ -50,4 +50,16 @@ void addargs(arglist *, char *, ...) __attribute__((format(printf, 2, 3)));
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char *read_passphrase(const char *, int);
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int ask_permission(const char *, ...) __attribute__((format(printf, 1, 2)));
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int read_keyfile_line(FILE *, const char *, char *, size_t, u_long *);
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int tun_open(int);
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int tun_open(int, int);
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/* Common definitions for ssh tunnel device forwarding */
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#define SSH_TUNMODE_NO 0x00
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#define SSH_TUNMODE_POINTOPOINT 0x01
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#define SSH_TUNMODE_ETHERNET 0x02
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#define SSH_TUNMODE_DEFAULT SSH_TUNMODE_POINTOPOINT
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#define SSH_TUNMODE_YES (SSH_TUNMODE_POINTOPOINT|SSH_TUNMODE_ETHERNET)
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#define SSH_TUNID_ANY 0x7fffffff
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#define SSH_TUNID_ERR (SSH_TUNID_ANY - 1)
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#define SSH_TUNID_MAX (SSH_TUNID_ANY - 2)
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32
readconf.c
32
readconf.c
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@ -12,7 +12,7 @@
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*/
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#include "includes.h"
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RCSID("$OpenBSD: readconf.c,v 1.144 2005/12/06 22:38:27 reyk Exp $");
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RCSID("$OpenBSD: readconf.c,v 1.145 2005/12/08 18:34:11 reyk Exp $");
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#include "ssh.h"
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#include "xmalloc.h"
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@ -273,7 +273,7 @@ clear_forwardings(Options *options)
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xfree(options->remote_forwards[i].connect_host);
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}
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options->num_remote_forwards = 0;
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options->tun_open = 0;
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options->tun_open = SSH_TUNMODE_NO;
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}
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/*
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@ -835,14 +835,32 @@ parse_int:
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case oTunnel:
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intptr = &options->tun_open;
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goto parse_flag;
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arg = strdelim(&s);
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if (!arg || *arg == '\0')
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fatal("%s line %d: Missing yes/point-to-point/"
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"ethernet/no argument.", filename, linenum);
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value = 0; /* silence compiler */
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if (strcasecmp(arg, "ethernet") == 0)
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value = SSH_TUNMODE_ETHERNET;
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else if (strcasecmp(arg, "point-to-point") == 0)
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value = SSH_TUNMODE_POINTOPOINT;
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else if (strcasecmp(arg, "yes") == 0)
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value = SSH_TUNMODE_DEFAULT;
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else if (strcasecmp(arg, "no") == 0)
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value = SSH_TUNMODE_NO;
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else
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fatal("%s line %d: Bad yes/point-to-point/ethernet/"
|
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"no argument: %s", filename, linenum, arg);
|
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if (*activep)
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*intptr = value;
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break;
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|
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case oTunnelDevice:
|
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arg = strdelim(&s);
|
||||
if (!arg || *arg == '\0')
|
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fatal("%.200s line %d: Missing argument.", filename, linenum);
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value = a2tun(arg, &value2);
|
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if (value < -1)
|
||||
if (value == SSH_TUNID_ERR)
|
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fatal("%.200s line %d: Bad tun device.", filename, linenum);
|
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if (*activep) {
|
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options->tun_local = value;
|
||||
|
|
@ -1132,7 +1150,11 @@ fill_default_options(Options * options)
|
|||
if (options->hash_known_hosts == -1)
|
||||
options->hash_known_hosts = 0;
|
||||
if (options->tun_open == -1)
|
||||
options->tun_open = 0;
|
||||
options->tun_open = SSH_TUNMODE_NO;
|
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if (options->tun_local == -1)
|
||||
options->tun_local = SSH_TUNID_ANY;
|
||||
if (options->tun_remote == -1)
|
||||
options->tun_remote = SSH_TUNID_ANY;
|
||||
if (options->permit_local_command == -1)
|
||||
options->permit_local_command = 0;
|
||||
/* options->local_command should not be set by default */
|
||||
|
|
|
|||
24
servconf.c
24
servconf.c
|
|
@ -10,7 +10,7 @@
|
|||
*/
|
||||
|
||||
#include "includes.h"
|
||||
RCSID("$OpenBSD: servconf.c,v 1.145 2005/12/06 22:38:27 reyk Exp $");
|
||||
RCSID("$OpenBSD: servconf.c,v 1.146 2005/12/08 18:34:11 reyk Exp $");
|
||||
|
||||
#include "ssh.h"
|
||||
#include "log.h"
|
||||
|
|
@ -231,7 +231,7 @@ fill_default_server_options(ServerOptions *options)
|
|||
if (options->authorized_keys_file == NULL)
|
||||
options->authorized_keys_file = _PATH_SSH_USER_PERMITTED_KEYS;
|
||||
if (options->permit_tun == -1)
|
||||
options->permit_tun = 0;
|
||||
options->permit_tun = SSH_TUNMODE_NO;
|
||||
|
||||
/* Turn privilege separation on by default */
|
||||
if (use_privsep == -1)
|
||||
|
|
@ -968,7 +968,25 @@ parse_flag:
|
|||
|
||||
case sPermitTunnel:
|
||||
intptr = &options->permit_tun;
|
||||
goto parse_flag;
|
||||
arg = strdelim(&cp);
|
||||
if (!arg || *arg == '\0')
|
||||
fatal("%s line %d: Missing yes/point-to-point/"
|
||||
"ethernet/no argument.", filename, linenum);
|
||||
value = 0; /* silence compiler */
|
||||
if (strcasecmp(arg, "ethernet") == 0)
|
||||
value = SSH_TUNMODE_ETHERNET;
|
||||
else if (strcasecmp(arg, "point-to-point") == 0)
|
||||
value = SSH_TUNMODE_POINTOPOINT;
|
||||
else if (strcasecmp(arg, "yes") == 0)
|
||||
value = SSH_TUNMODE_YES;
|
||||
else if (strcasecmp(arg, "no") == 0)
|
||||
value = SSH_TUNMODE_NO;
|
||||
else
|
||||
fatal("%s line %d: Bad yes/point-to-point/ethernet/"
|
||||
"no argument: %s", filename, linenum, arg);
|
||||
if (*intptr == -1)
|
||||
*intptr = value;
|
||||
break;
|
||||
|
||||
case sDeprecated:
|
||||
logit("%s line %d: Deprecated option %s",
|
||||
|
|
|
|||
25
serverloop.c
25
serverloop.c
|
|
@ -35,7 +35,7 @@
|
|||
*/
|
||||
|
||||
#include "includes.h"
|
||||
RCSID("$OpenBSD: serverloop.c,v 1.122 2005/12/06 22:38:27 reyk Exp $");
|
||||
RCSID("$OpenBSD: serverloop.c,v 1.123 2005/12/08 18:34:11 reyk Exp $");
|
||||
|
||||
#include "xmalloc.h"
|
||||
#include "packet.h"
|
||||
|
|
@ -917,20 +917,31 @@ static Channel *
|
|||
server_request_tun(void)
|
||||
{
|
||||
Channel *c = NULL;
|
||||
int sock, tun;
|
||||
int mode, tun;
|
||||
int sock;
|
||||
|
||||
if (!options.permit_tun) {
|
||||
packet_send_debug("Server has disabled tunnel device forwarding.");
|
||||
mode = packet_get_int();
|
||||
switch (mode) {
|
||||
case SSH_TUNMODE_POINTOPOINT:
|
||||
case SSH_TUNMODE_ETHERNET:
|
||||
break;
|
||||
default:
|
||||
packet_send_debug("Unsupported tunnel device mode.");
|
||||
return NULL;
|
||||
}
|
||||
if ((options.permit_tun & mode) == 0) {
|
||||
packet_send_debug("Server has rejected tunnel device "
|
||||
"forwarding");
|
||||
return NULL;
|
||||
}
|
||||
|
||||
tun = packet_get_int();
|
||||
if (forced_tun_device != -1) {
|
||||
if (tun != -1 && forced_tun_device != tun)
|
||||
if (forced_tun_device != SSH_TUNID_ANY) {
|
||||
if (tun != SSH_TUNID_ANY && forced_tun_device != tun)
|
||||
goto done;
|
||||
tun = forced_tun_device;
|
||||
}
|
||||
sock = tun_open(tun);
|
||||
sock = tun_open(tun, mode);
|
||||
if (sock < 0)
|
||||
goto done;
|
||||
c = channel_new("tun", SSH_CHANNEL_OPEN, sock, sock, -1,
|
||||
|
|
|
|||
13
ssh.c
13
ssh.c
|
|
@ -40,7 +40,7 @@
|
|||
*/
|
||||
|
||||
#include "includes.h"
|
||||
RCSID("$OpenBSD: ssh.c,v 1.255 2005/12/06 22:38:27 reyk Exp $");
|
||||
RCSID("$OpenBSD: ssh.c,v 1.256 2005/12/08 18:34:11 reyk Exp $");
|
||||
|
||||
#include <openssl/evp.h>
|
||||
#include <openssl/err.h>
|
||||
|
|
@ -341,9 +341,10 @@ again:
|
|||
exit(0);
|
||||
break;
|
||||
case 'w':
|
||||
options.tun_open = 1;
|
||||
if (options.tun_open == -1)
|
||||
options.tun_open = SSH_TUNMODE_DEFAULT;
|
||||
options.tun_local = a2tun(optarg, &options.tun_remote);
|
||||
if (options.tun_local < -1) {
|
||||
if (options.tun_local == SSH_TUNID_ERR) {
|
||||
fprintf(stderr, "Bad tun device '%s'\n", optarg);
|
||||
exit(1);
|
||||
}
|
||||
|
|
@ -1067,12 +1068,13 @@ ssh_session2_setup(int id, void *arg)
|
|||
packet_send();
|
||||
}
|
||||
|
||||
if (options.tun_open) {
|
||||
if (options.tun_open != SSH_TUNMODE_NO) {
|
||||
Channel *c;
|
||||
int fd;
|
||||
|
||||
debug("Requesting tun.");
|
||||
if ((fd = tun_open(options.tun_local)) >= 0) {
|
||||
if ((fd = tun_open(options.tun_local,
|
||||
options.tun_open)) >= 0) {
|
||||
c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
|
||||
CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
|
||||
0, "tun", 1);
|
||||
|
|
@ -1082,6 +1084,7 @@ ssh_session2_setup(int id, void *arg)
|
|||
packet_put_int(c->self);
|
||||
packet_put_int(c->local_window_max);
|
||||
packet_put_int(c->local_maxpacket);
|
||||
packet_put_int(options.tun_open);
|
||||
packet_put_int(options.tun_remote);
|
||||
packet_send();
|
||||
}
|
||||
|
|
|
|||
10
ssh_config.5
10
ssh_config.5
|
|
@ -34,7 +34,7 @@
|
|||
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
||||
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
.\"
|
||||
.\" $OpenBSD: ssh_config.5,v 1.67 2005/12/08 15:06:29 jmc Exp $
|
||||
.\" $OpenBSD: ssh_config.5,v 1.68 2005/12/08 18:34:11 reyk Exp $
|
||||
.Dd September 25, 1999
|
||||
.Dt SSH_CONFIG 5
|
||||
.Os
|
||||
|
|
@ -911,9 +911,13 @@ with older servers.
|
|||
.It Cm Tunnel
|
||||
Request starting
|
||||
.Xr tun 4
|
||||
device forwarding between the client and the server.
|
||||
device forwarding between the client and the server. This option also
|
||||
allows requesting layer 2 (ethernet) instead of layer 3
|
||||
(point-to-point) tunneling from the server.
|
||||
The argument must be
|
||||
.Dq yes
|
||||
.Dq yes ,
|
||||
.Dq point-to-point ,
|
||||
.Dq ethernet
|
||||
or
|
||||
.Dq no .
|
||||
The default is
|
||||
|
|
|
|||
|
|
@ -34,7 +34,7 @@
|
|||
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
||||
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
.\"
|
||||
.\" $OpenBSD: sshd_config.5,v 1.46 2005/12/06 22:38:28 reyk Exp $
|
||||
.\" $OpenBSD: sshd_config.5,v 1.47 2005/12/08 18:34:11 reyk Exp $
|
||||
.Dd September 25, 1999
|
||||
.Dt SSHD_CONFIG 5
|
||||
.Os
|
||||
|
|
@ -506,6 +506,12 @@ root is not allowed to log in.
|
|||
Specifies whether
|
||||
.Xr tun 4
|
||||
device forwarding is allowed.
|
||||
The argument must be
|
||||
.Dq yes ,
|
||||
.Dq point-to-point ,
|
||||
.Dq ethernet
|
||||
or
|
||||
.Dq no .
|
||||
The default is
|
||||
.Dq no .
|
||||
.It Cm PermitUserEnvironment
|
||||
|
|
|
|||
Loading…
Reference in New Issue