version 1.57, 2000/05/08 17:42:24 |
version 1.57.2.4, 2001/03/12 15:44:08 |
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/* |
/* |
* |
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* channels.c |
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* |
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* Author: Tatu Ylonen <ylo@cs.hut.fi> |
* Author: Tatu Ylonen <ylo@cs.hut.fi> |
* |
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
* All rights reserved |
* All rights reserved |
* |
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* Created: Fri Mar 24 16:35:24 1995 ylo |
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* |
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* This file contains functions for generic socket connection forwarding. |
* This file contains functions for generic socket connection forwarding. |
* There is also code for initiating connection forwarding for X11 connections, |
* There is also code for initiating connection forwarding for X11 connections, |
* arbitrary tcp/ip connections, and the authentication agent connection. |
* arbitrary tcp/ip connections, and the authentication agent connection. |
* |
* |
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* As far as I am concerned, the code I have written for this software |
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* can be used freely for any purpose. Any derived versions of this |
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* software must be clearly marked as such, and if the derived work is |
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* incompatible with the protocol description in the RFC file, it must be |
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* called by a name other than "ssh" or "Secure Shell". |
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* |
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* |
* SSH2 support added by Markus Friedl. |
* SSH2 support added by Markus Friedl. |
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* Copyright (c) 1999,2000 Markus Friedl. All rights reserved. |
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* Copyright (c) 1999 Dug Song. All rights reserved. |
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* Copyright (c) 1999 Theo de Raadt. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
*/ |
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#include "includes.h" |
#include "includes.h" |
RCSID("$Id$"); |
RCSID("$OpenBSD$"); |
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#include <openssl/rsa.h> |
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#include <openssl/dsa.h> |
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#include "ssh.h" |
#include "ssh.h" |
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#include "ssh1.h" |
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#include "ssh2.h" |
#include "packet.h" |
#include "packet.h" |
#include "xmalloc.h" |
#include "xmalloc.h" |
#include "buffer.h" |
#include "buffer.h" |
#include "authfd.h" |
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#include "uidswap.h" |
#include "uidswap.h" |
#include "readconf.h" |
#include "log.h" |
#include "servconf.h" |
#include "misc.h" |
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#include "channels.h" |
#include "channels.h" |
#include "nchan.h" |
#include "nchan.h" |
#include "compat.h" |
#include "compat.h" |
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#include "canohost.h" |
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#include "key.h" |
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#include "authfd.h" |
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#include "ssh2.h" |
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/* Maximum number of fake X11 displays to try. */ |
/* Maximum number of fake X11 displays to try. */ |
#define MAX_DISPLAYS 1000 |
#define MAX_DISPLAYS 1000 |
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/* Max len of agent socket */ |
/* Max len of agent socket */ |
#define MAX_SOCKET_NAME 100 |
#define MAX_SOCKET_NAME 100 |
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/* default window/packet sizes for tcp/x11-fwd-channel */ |
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#define CHAN_TCP_WINDOW_DEFAULT (8*1024) |
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#define CHAN_TCP_PACKET_DEFAULT (CHAN_TCP_WINDOW_DEFAULT/2) |
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#define CHAN_X11_WINDOW_DEFAULT (4*1024) |
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#define CHAN_X11_PACKET_DEFAULT (CHAN_X11_WINDOW_DEFAULT/2) |
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/* |
/* |
* Pointer to an array containing all allocated channels. The array is |
* Pointer to an array containing all allocated channels. The array is |
* dynamically extended as needed. |
* dynamically extended as needed. |
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* Maximum file descriptor value used in any of the channels. This is |
* Maximum file descriptor value used in any of the channels. This is |
* updated in channel_allocate. |
* updated in channel_allocate. |
*/ |
*/ |
static int channel_max_fd_value = 0; |
static int channel_max_fd = 0; |
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/* Name and directory of socket for authentication agent forwarding. */ |
/* Name and directory of socket for authentication agent forwarding. */ |
static char *channel_forwarded_auth_socket_name = NULL; |
static char *channel_forwarded_auth_socket_name = NULL; |
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/* Saved X11 authentication data. This is the real data. */ |
/* Saved X11 authentication data. This is the real data. */ |
char *x11_saved_data = NULL; |
char *x11_saved_data = NULL; |
unsigned int x11_saved_data_len = 0; |
u_int x11_saved_data_len = 0; |
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/* |
/* |
* Fake X11 authentication data. This is what the server will be sending us; |
* Fake X11 authentication data. This is what the server will be sending us; |
* we should replace any occurrences of this by the real data. |
* we should replace any occurrences of this by the real data. |
*/ |
*/ |
char *x11_fake_data = NULL; |
char *x11_fake_data = NULL; |
unsigned int x11_fake_data_len; |
u_int x11_fake_data_len; |
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/* |
/* |
* Data structure for storing which hosts are permitted for forward requests. |
* Data structure for storing which hosts are permitted for forward requests. |
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/* This is set to true if both sides support SSH_PROTOFLAG_HOST_IN_FWD_OPEN. */ |
/* This is set to true if both sides support SSH_PROTOFLAG_HOST_IN_FWD_OPEN. */ |
static int have_hostname_in_open = 0; |
static int have_hostname_in_open = 0; |
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/* AF_UNSPEC or AF_INET or AF_INET6 */ |
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extern int IPv4or6; |
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/* Sets specific protocol options. */ |
/* Sets specific protocol options. */ |
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void |
void |
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channel_lookup(int id) |
channel_lookup(int id) |
{ |
{ |
Channel *c; |
Channel *c; |
if (id < 0 && id > channels_alloc) { |
if (id < 0 || id > channels_alloc) { |
log("channel_lookup: %d: bad id", id); |
log("channel_lookup: %d: bad id", id); |
return NULL; |
return NULL; |
} |
} |
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return c; |
return c; |
} |
} |
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void |
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set_nonblock(int fd) |
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{ |
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int val; |
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val = fcntl(fd, F_GETFL, 0); |
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if (val < 0) { |
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error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno)); |
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return; |
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} |
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if (val & O_NONBLOCK) |
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return; |
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debug("fd %d setting O_NONBLOCK", fd); |
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val |= O_NONBLOCK; |
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if (fcntl(fd, F_SETFL, val) == -1) |
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error("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd, strerror(errno)); |
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} |
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/* |
/* |
* Register filedescriptors for a channel, used when allocating a channel or |
* Register filedescriptors for a channel, used when allocating a channel or |
* when the channel consumer/producer is ready, e.g. shell exec'd |
* when the channel consumer/producer is ready, e.g. shell exec'd |
*/ |
*/ |
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void |
void |
channel_register_fds(Channel *c, int rfd, int wfd, int efd, int extusage) |
channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
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int extusage, int nonblock) |
{ |
{ |
/* Update the maximum file descriptor value. */ |
/* Update the maximum file descriptor value. */ |
if (rfd > channel_max_fd_value) |
channel_max_fd = MAX(channel_max_fd, rfd); |
channel_max_fd_value = rfd; |
channel_max_fd = MAX(channel_max_fd, wfd); |
if (wfd > channel_max_fd_value) |
channel_max_fd = MAX(channel_max_fd, efd); |
channel_max_fd_value = wfd; |
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if (efd > channel_max_fd_value) |
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channel_max_fd_value = efd; |
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/* XXX set close-on-exec -markus */ |
/* XXX set close-on-exec -markus */ |
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c->rfd = rfd; |
c->rfd = rfd; |
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c->sock = (rfd == wfd) ? rfd : -1; |
c->sock = (rfd == wfd) ? rfd : -1; |
c->efd = efd; |
c->efd = efd; |
c->extended_usage = extusage; |
c->extended_usage = extusage; |
if (rfd != -1) |
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set_nonblock(rfd); |
/* XXX ugly hack: nonblock is only set by the server */ |
if (wfd != -1) |
if (nonblock && isatty(c->rfd)) { |
set_nonblock(wfd); |
debug("channel: %d: rfd %d isatty", c->self, c->rfd); |
if (efd != -1) |
c->isatty = 1; |
set_nonblock(efd); |
if (!isatty(c->wfd)) { |
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error("channel: %d: wfd %d is not a tty?", |
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c->self, c->wfd); |
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} |
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} else { |
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c->isatty = 0; |
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} |
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/* enable nonblocking mode */ |
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if (nonblock) { |
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if (rfd != -1) |
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set_nonblock(rfd); |
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if (wfd != -1) |
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set_nonblock(wfd); |
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if (efd != -1) |
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set_nonblock(efd); |
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} |
} |
} |
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/* |
/* |
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int |
int |
channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
int window, int maxpack, int extusage, char *remote_name) |
int window, int maxpack, int extusage, char *remote_name, int nonblock) |
{ |
{ |
int i, found; |
int i, found; |
Channel *c; |
Channel *c; |
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/* There are no free slots. Take last+1 slot and expand the array. */ |
/* There are no free slots. Take last+1 slot and expand the array. */ |
found = channels_alloc; |
found = channels_alloc; |
channels_alloc += 10; |
channels_alloc += 10; |
debug("channel: expanding %d", channels_alloc); |
debug2("channel: expanding %d", channels_alloc); |
channels = xrealloc(channels, channels_alloc * sizeof(Channel)); |
channels = xrealloc(channels, channels_alloc * sizeof(Channel)); |
for (i = found; i < channels_alloc; i++) |
for (i = found; i < channels_alloc; i++) |
channels[i].type = SSH_CHANNEL_FREE; |
channels[i].type = SSH_CHANNEL_FREE; |
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buffer_init(&c->output); |
buffer_init(&c->output); |
buffer_init(&c->extended); |
buffer_init(&c->extended); |
chan_init_iostates(c); |
chan_init_iostates(c); |
channel_register_fds(c, rfd, wfd, efd, extusage); |
channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
c->self = found; |
c->self = found; |
c->type = type; |
c->type = type; |
c->ctype = ctype; |
c->ctype = ctype; |
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c->cb_arg = NULL; |
c->cb_arg = NULL; |
c->cb_event = 0; |
c->cb_event = 0; |
c->dettach_user = NULL; |
c->dettach_user = NULL; |
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c->input_filter = NULL; |
debug("channel %d: new [%s]", found, remote_name); |
debug("channel %d: new [%s]", found, remote_name); |
return found; |
return found; |
} |
} |
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int |
int |
channel_allocate(int type, int sock, char *remote_name) |
channel_allocate(int type, int sock, char *remote_name) |
{ |
{ |
return channel_new("", type, sock, sock, -1, 0, 0, 0, remote_name); |
return channel_new("", type, sock, sock, -1, 0, 0, 0, remote_name, 1); |
} |
} |
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channel_free(int id) |
channel_free(int id) |
{ |
{ |
Channel *c = channel_lookup(id); |
Channel *c = channel_lookup(id); |
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char *s = channel_open_message(); |
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if (c == NULL) |
if (c == NULL) |
packet_disconnect("channel free: bad local channel %d", id); |
packet_disconnect("channel free: bad local channel %d", id); |
debug("channel_free: channel %d: status: %s", id, channel_open_message()); |
debug("channel_free: channel %d: status: %s", id, s); |
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xfree(s); |
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if (c->dettach_user != NULL) { |
if (c->dettach_user != NULL) { |
debug("channel_free: channel %d: dettaching channel user", id); |
debug("channel_free: channel %d: dettaching channel user", id); |
c->dettach_user(c->self, NULL); |
c->dettach_user(c->self, NULL); |
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} |
} |
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void |
void |
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channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset) |
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{ |
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debug3("channel %d: waiting for connection", c->self); |
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FD_SET(c->sock, writeset); |
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} |
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void |
channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset) |
channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset) |
{ |
{ |
if (buffer_len(&c->input) < packet_get_maxsize()) |
if (buffer_len(&c->input) < packet_get_maxsize()) |
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int |
int |
x11_open_helper(Channel *c) |
x11_open_helper(Channel *c) |
{ |
{ |
unsigned char *ucp; |
u_char *ucp; |
unsigned int proto_len, data_len; |
u_int proto_len, data_len; |
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/* Check if the fixed size part of the packet is in buffer. */ |
/* Check if the fixed size part of the packet is in buffer. */ |
if (buffer_len(&c->output) < 12) |
if (buffer_len(&c->output) < 12) |
return 0; |
return 0; |
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/* Parse the lengths of variable-length fields. */ |
/* Parse the lengths of variable-length fields. */ |
ucp = (unsigned char *) buffer_ptr(&c->output); |
ucp = (u_char *) buffer_ptr(&c->output); |
if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
proto_len = 256 * ucp[6] + ucp[7]; |
proto_len = 256 * ucp[6] + ucp[7]; |
data_len = 256 * ucp[8] + ucp[9]; |
data_len = 256 * ucp[8] + ucp[9]; |
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struct sockaddr addr; |
struct sockaddr addr; |
int newsock, newch; |
int newsock, newch; |
socklen_t addrlen; |
socklen_t addrlen; |
char buf[16384], *remote_hostname; |
char buf[16384], *remote_ipaddr; |
int remote_port; |
int remote_port; |
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if (FD_ISSET(c->sock, readset)) { |
if (FD_ISSET(c->sock, readset)) { |
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error("accept: %.100s", strerror(errno)); |
error("accept: %.100s", strerror(errno)); |
return; |
return; |
} |
} |
remote_hostname = get_remote_hostname(newsock); |
remote_ipaddr = get_peer_ipaddr(newsock); |
remote_port = get_peer_port(newsock); |
remote_port = get_peer_port(newsock); |
snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
remote_hostname, remote_port); |
remote_ipaddr, remote_port); |
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newch = channel_new("x11", |
newch = channel_new("x11", |
SSH_CHANNEL_OPENING, newsock, newsock, -1, |
SSH_CHANNEL_OPENING, newsock, newsock, -1, |
c->local_window_max, c->local_maxpacket, |
c->local_window_max, c->local_maxpacket, |
0, xstrdup(buf)); |
0, xstrdup(buf), 1); |
if (compat20) { |
if (compat20) { |
packet_start(SSH2_MSG_CHANNEL_OPEN); |
packet_start(SSH2_MSG_CHANNEL_OPEN); |
packet_put_cstring("x11"); |
packet_put_cstring("x11"); |
packet_put_int(newch); |
packet_put_int(newch); |
packet_put_int(c->local_window_max); |
packet_put_int(c->local_window_max); |
packet_put_int(c->local_maxpacket); |
packet_put_int(c->local_maxpacket); |
/* originator host and port */ |
/* originator ipaddr and port */ |
packet_put_cstring(remote_hostname); |
packet_put_cstring(remote_ipaddr); |
if (datafellows & SSH_BUG_X11FWD) { |
if (datafellows & SSH_BUG_X11FWD) { |
debug("ssh2 x11 bug compat mode"); |
debug("ssh2 x11 bug compat mode"); |
} else { |
} else { |
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packet_put_string(buf, strlen(buf)); |
packet_put_string(buf, strlen(buf)); |
packet_send(); |
packet_send(); |
} |
} |
xfree(remote_hostname); |
xfree(remote_ipaddr); |
} |
} |
} |
} |
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struct sockaddr addr; |
struct sockaddr addr; |
int newsock, newch; |
int newsock, newch; |
socklen_t addrlen; |
socklen_t addrlen; |
char buf[1024], *remote_hostname; |
char buf[1024], *remote_ipaddr, *rtype; |
int remote_port; |
int remote_port; |
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rtype = (c->type == SSH_CHANNEL_RPORT_LISTENER) ? |
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"forwarded-tcpip" : "direct-tcpip"; |
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if (FD_ISSET(c->sock, readset)) { |
if (FD_ISSET(c->sock, readset)) { |
debug("Connection to port %d forwarding " |
debug("Connection to port %d forwarding " |
"to %.100s port %d requested.", |
"to %.100s port %d requested.", |
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error("accept: %.100s", strerror(errno)); |
error("accept: %.100s", strerror(errno)); |
return; |
return; |
} |
} |
remote_hostname = get_remote_hostname(newsock); |
remote_ipaddr = get_peer_ipaddr(newsock); |
remote_port = get_peer_port(newsock); |
remote_port = get_peer_port(newsock); |
snprintf(buf, sizeof buf, |
snprintf(buf, sizeof buf, |
"listen port %d for %.100s port %d, " |
"listen port %d for %.100s port %d, " |
"connect from %.200s port %d", |
"connect from %.200s port %d", |
c->listening_port, c->path, c->host_port, |
c->listening_port, c->path, c->host_port, |
remote_hostname, remote_port); |
remote_ipaddr, remote_port); |
newch = channel_new("direct-tcpip", |
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newch = channel_new(rtype, |
SSH_CHANNEL_OPENING, newsock, newsock, -1, |
SSH_CHANNEL_OPENING, newsock, newsock, -1, |
c->local_window_max, c->local_maxpacket, |
c->local_window_max, c->local_maxpacket, |
0, xstrdup(buf)); |
0, xstrdup(buf), 1); |
if (compat20) { |
if (compat20) { |
packet_start(SSH2_MSG_CHANNEL_OPEN); |
packet_start(SSH2_MSG_CHANNEL_OPEN); |
packet_put_cstring("direct-tcpip"); |
packet_put_cstring(rtype); |
packet_put_int(newch); |
packet_put_int(newch); |
packet_put_int(c->local_window_max); |
packet_put_int(c->local_window_max); |
packet_put_int(c->local_maxpacket); |
packet_put_int(c->local_maxpacket); |
/* target host and port */ |
if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
packet_put_string(c->path, strlen(c->path)); |
/* listen address, port */ |
packet_put_int(c->host_port); |
packet_put_string(c->path, strlen(c->path)); |
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packet_put_int(c->listening_port); |
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} else { |
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/* target host, port */ |
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packet_put_string(c->path, strlen(c->path)); |
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packet_put_int(c->host_port); |
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} |
/* originator host and port */ |
/* originator host and port */ |
packet_put_cstring(remote_hostname); |
packet_put_cstring(remote_ipaddr); |
packet_put_int(remote_port); |
packet_put_int(remote_port); |
packet_send(); |
packet_send(); |
} else { |
} else { |
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} |
} |
packet_send(); |
packet_send(); |
} |
} |
xfree(remote_hostname); |
xfree(remote_ipaddr); |
} |
} |
} |
} |
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error("accept from auth socket: %.100s", strerror(errno)); |
error("accept from auth socket: %.100s", strerror(errno)); |
return; |
return; |
} |
} |
newch = channel_allocate(SSH_CHANNEL_OPENING, newsock, |
newch = channel_new("accepted auth socket", |
xstrdup("accepted auth socket")); |
SSH_CHANNEL_OPENING, newsock, newsock, -1, |
packet_start(SSH_SMSG_AGENT_OPEN); |
c->local_window_max, c->local_maxpacket, |
packet_put_int(newch); |
0, xstrdup("accepted auth socket"), 1); |
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if (compat20) { |
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packet_start(SSH2_MSG_CHANNEL_OPEN); |
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packet_put_cstring("auth-agent@openssh.com"); |
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packet_put_int(newch); |
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packet_put_int(c->local_window_max); |
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packet_put_int(c->local_maxpacket); |
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} else { |
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packet_start(SSH_SMSG_AGENT_OPEN); |
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packet_put_int(newch); |
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} |
packet_send(); |
packet_send(); |
} |
} |
} |
} |
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void |
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channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset) |
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{ |
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if (FD_ISSET(c->sock, writeset)) { |
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int err = 0; |
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int sz = sizeof(err); |
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c->type = SSH_CHANNEL_OPEN; |
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if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, (char *)&err, &sz) < 0) { |
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debug("getsockopt SO_ERROR failed"); |
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} else { |
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if (err == 0) { |
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debug("channel %d: connected)", c->self); |
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} else { |
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debug("channel %d: not connected: %s", |
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c->self, strerror(err)); |
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chan_read_failed(c); |
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chan_write_failed(c); |
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} |
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} |
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} |
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} |
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int |
int |
channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset) |
channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset) |
{ |
{ |
|
|
} |
} |
return -1; |
return -1; |
} |
} |
buffer_append(&c->input, buf, len); |
if(c->input_filter != NULL) { |
|
if (c->input_filter(c, buf, len) == -1) { |
|
debug("filter stops channel %d", c->self); |
|
chan_read_failed(c); |
|
} |
|
} else { |
|
buffer_append(&c->input, buf, len); |
|
} |
} |
} |
return 1; |
return 1; |
} |
} |
|
|
} |
} |
return -1; |
return -1; |
} |
} |
|
if (compat20 && c->isatty) { |
|
struct termios tio; |
|
if (tcgetattr(c->wfd, &tio) == 0 && |
|
!(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { |
|
/* |
|
* Simulate echo to reduce the impact of |
|
* traffic analysis. |
|
*/ |
|
packet_start(SSH2_MSG_IGNORE); |
|
memset(buffer_ptr(&c->output), 0, len); |
|
packet_put_string(buffer_ptr(&c->output), len); |
|
packet_send(); |
|
} |
|
} |
buffer_consume(&c->output, len); |
buffer_consume(&c->output, len); |
if (compat20 && len > 0) { |
if (compat20 && len > 0) { |
c->local_consumed += len; |
c->local_consumed += len; |
|
|
buffer_len(&c->extended) > 0) { |
buffer_len(&c->extended) > 0) { |
len = write(c->efd, buffer_ptr(&c->extended), |
len = write(c->efd, buffer_ptr(&c->extended), |
buffer_len(&c->extended)); |
buffer_len(&c->extended)); |
debug("channel %d: written %d to efd %d", |
debug2("channel %d: written %d to efd %d", |
c->self, len, c->efd); |
c->self, len, c->efd); |
if (len > 0) { |
if (len > 0) { |
buffer_consume(&c->extended, len); |
buffer_consume(&c->extended, len); |
|
|
} else if (c->extended_usage == CHAN_EXTENDED_READ && |
} else if (c->extended_usage == CHAN_EXTENDED_READ && |
FD_ISSET(c->efd, readset)) { |
FD_ISSET(c->efd, readset)) { |
len = read(c->efd, buf, sizeof(buf)); |
len = read(c->efd, buf, sizeof(buf)); |
debug("channel %d: read %d from efd %d", |
debug2("channel %d: read %d from efd %d", |
c->self, len, c->efd); |
c->self, len, c->efd); |
if (len == 0) { |
if (len == 0) { |
debug("channel %d: closing efd %d", |
debug("channel %d: closing efd %d", |
|
|
packet_put_int(c->remote_id); |
packet_put_int(c->remote_id); |
packet_put_int(c->local_consumed); |
packet_put_int(c->local_consumed); |
packet_send(); |
packet_send(); |
debug("channel %d: window %d sent adjust %d", |
debug2("channel %d: window %d sent adjust %d", |
c->self, c->local_window, |
c->self, c->local_window, |
c->local_consumed); |
c->local_consumed); |
c->local_window += c->local_consumed; |
c->local_window += c->local_consumed; |
|
|
channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_20; |
channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_20; |
channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
|
channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
|
channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
|
channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
|
|
channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_2; |
channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_2; |
channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
|
channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
|
channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
|
channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
} |
} |
|
|
void |
void |
|
|
channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; |
channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; |
channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; |
channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; |
|
channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
|
|
channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1; |
channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1; |
channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; |
channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; |
|
channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
} |
} |
|
|
void |
void |
|
|
channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
|
channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
|
|
channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1; |
channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1; |
|
channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
} |
} |
|
|
void |
void |
|
|
} |
} |
|
|
void |
void |
channel_prepare_select(fd_set * readset, fd_set * writeset) |
channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp) |
{ |
{ |
channel_handler(channel_pre, readset, writeset); |
int n; |
|
u_int sz; |
|
|
|
n = MAX(*maxfdp, channel_max_fd); |
|
|
|
sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); |
|
if (*readsetp == NULL || n > *maxfdp) { |
|
if (*readsetp) |
|
xfree(*readsetp); |
|
if (*writesetp) |
|
xfree(*writesetp); |
|
*readsetp = xmalloc(sz); |
|
*writesetp = xmalloc(sz); |
|
*maxfdp = n; |
|
} |
|
memset(*readsetp, 0, sz); |
|
memset(*writesetp, 0, sz); |
|
|
|
channel_handler(channel_pre, *readsetp, *writesetp); |
} |
} |
|
|
void |
void |
|
|
channel_handler(channel_post, readset, writeset); |
channel_handler(channel_post, readset, writeset); |
} |
} |
|
|
/* If there is data to send to the connection, send some of it now. */ |
/* If there is data to send to the connection, enqueue some of it now. */ |
|
|
void |
void |
channel_output_poll() |
channel_output_poll() |
|
|
packet_send(); |
packet_send(); |
buffer_consume(&c->input, len); |
buffer_consume(&c->input, len); |
c->remote_window -= len; |
c->remote_window -= len; |
debug("channel %d: send data len %d", c->self, len); |
|
} |
} |
} else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { |
} else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { |
if (compat13) |
if (compat13) |
|
|
*/ |
*/ |
|
|
void |
void |
channel_input_data(int type, int plen) |
channel_input_data(int type, int plen, void *ctxt) |
{ |
{ |
int id; |
int id; |
char *data; |
char *data; |
unsigned int data_len; |
u_int data_len; |
Channel *c; |
Channel *c; |
|
|
/* Get the channel number and verify it. */ |
/* Get the channel number and verify it. */ |
|
|
xfree(data); |
xfree(data); |
} |
} |
void |
void |
channel_input_extended_data(int type, int plen) |
channel_input_extended_data(int type, int plen, void *ctxt) |
{ |
{ |
int id; |
int id; |
int tcode; |
int tcode; |
char *data; |
char *data; |
unsigned int data_len; |
u_int data_len; |
Channel *c; |
Channel *c; |
|
|
/* Get the channel number and verify it. */ |
/* Get the channel number and verify it. */ |
|
|
xfree(data); |
xfree(data); |
return; |
return; |
} |
} |
debug("channel %d: rcvd ext data %d", c->self, data_len); |
debug2("channel %d: rcvd ext data %d", c->self, data_len); |
c->local_window -= data_len; |
c->local_window -= data_len; |
buffer_append(&c->extended, data, data_len); |
buffer_append(&c->extended, data, data_len); |
xfree(data); |
xfree(data); |
|
|
int |
int |
channel_not_very_much_buffered_data() |
channel_not_very_much_buffered_data() |
{ |
{ |
unsigned int i; |
u_int i; |
Channel *c; |
Channel *c; |
|
|
for (i = 0; i < channels_alloc; i++) { |
for (i = 0; i < channels_alloc; i++) { |
|
|
} |
} |
|
|
void |
void |
channel_input_ieof(int type, int plen) |
channel_input_ieof(int type, int plen, void *ctxt) |
{ |
{ |
int id; |
int id; |
Channel *c; |
Channel *c; |
|
|
} |
} |
|
|
void |
void |
channel_input_close(int type, int plen) |
channel_input_close(int type, int plen, void *ctxt) |
{ |
{ |
int id; |
int id; |
Channel *c; |
Channel *c; |
|
|
|
|
/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
void |
void |
channel_input_oclose(int type, int plen) |
channel_input_oclose(int type, int plen, void *ctxt) |
{ |
{ |
int id = packet_get_int(); |
int id = packet_get_int(); |
Channel *c = channel_lookup(id); |
Channel *c = channel_lookup(id); |
|
|
} |
} |
|
|
void |
void |
channel_input_close_confirmation(int type, int plen) |
channel_input_close_confirmation(int type, int plen, void *ctxt) |
{ |
{ |
int id = packet_get_int(); |
int id = packet_get_int(); |
Channel *c = channel_lookup(id); |
Channel *c = channel_lookup(id); |
|
|
} |
} |
|
|
void |
void |
channel_input_open_confirmation(int type, int plen) |
channel_input_open_confirmation(int type, int plen, void *ctxt) |
{ |
{ |
int id, remote_id; |
int id, remote_id; |
Channel *c; |
Channel *c; |
|
|
c->remote_maxpacket = packet_get_int(); |
c->remote_maxpacket = packet_get_int(); |
packet_done(); |
packet_done(); |
if (c->cb_fn != NULL && c->cb_event == type) { |
if (c->cb_fn != NULL && c->cb_event == type) { |
debug("callback start"); |
debug2("callback start"); |
c->cb_fn(c->self, c->cb_arg); |
c->cb_fn(c->self, c->cb_arg); |
debug("callback done"); |
debug2("callback done"); |
} |
} |
debug("channel %d: open confirm rwindow %d rmax %d", c->self, |
debug("channel %d: open confirm rwindow %d rmax %d", c->self, |
c->remote_window, c->remote_maxpacket); |
c->remote_window, c->remote_maxpacket); |
|
|
} |
} |
|
|
void |
void |
channel_input_open_failure(int type, int plen) |
channel_input_open_failure(int type, int plen, void *ctxt) |
{ |
{ |
int id; |
int id, reason; |
|
char *msg = NULL, *lang = NULL; |
Channel *c; |
Channel *c; |
|
|
if (!compat20) |
if (!compat20) |
|
|
packet_disconnect("Received open failure for " |
packet_disconnect("Received open failure for " |
"non-opening channel %d.", id); |
"non-opening channel %d.", id); |
if (compat20) { |
if (compat20) { |
int reason = packet_get_int(); |
reason = packet_get_int(); |
char *msg = packet_get_string(NULL); |
if (packet_remaining() > 0) { |
char *lang = packet_get_string(NULL); |
msg = packet_get_string(NULL); |
log("channel_open_failure: %d: reason %d: %s", id, reason, msg); |
lang = packet_get_string(NULL); |
|
} |
packet_done(); |
packet_done(); |
xfree(msg); |
log("channel_open_failure: %d: reason %d %s", id, |
xfree(lang); |
reason, msg ? msg : "<no additional info>"); |
|
if (msg != NULL) |
|
xfree(msg); |
|
if (lang != NULL) |
|
xfree(lang); |
} |
} |
/* Free the channel. This will also close the socket. */ |
/* Free the channel. This will also close the socket. */ |
channel_free(id); |
channel_free(id); |
} |
} |
|
|
void |
void |
channel_input_channel_request(int type, int plen) |
channel_input_channel_request(int type, int plen, void *ctxt) |
{ |
{ |
int id; |
int id; |
Channel *c; |
Channel *c; |
|
|
packet_disconnect("Received request for " |
packet_disconnect("Received request for " |
"non-open channel %d.", id); |
"non-open channel %d.", id); |
if (c->cb_fn != NULL && c->cb_event == type) { |
if (c->cb_fn != NULL && c->cb_event == type) { |
debug("callback start"); |
debug2("callback start"); |
c->cb_fn(c->self, c->cb_arg); |
c->cb_fn(c->self, c->cb_arg); |
debug("callback done"); |
debug2("callback done"); |
} else { |
} else { |
char *service = packet_get_string(NULL); |
char *service = packet_get_string(NULL); |
debug("channel: %d rcvd request for %s", c->self, service); |
debug("channel: %d rcvd request for %s", c->self, service); |
debug("cb_fn %p cb_event %d", c->cb_fn , c->cb_event); |
debug("cb_fn %p cb_event %d", c->cb_fn , c->cb_event); |
xfree(service); |
xfree(service); |
} |
} |
} |
} |
|
|
void |
void |
channel_input_window_adjust(int type, int plen) |
channel_input_window_adjust(int type, int plen, void *ctxt) |
{ |
{ |
Channel *c; |
Channel *c; |
int id, adjust; |
int id, adjust; |
|
|
} |
} |
adjust = packet_get_int(); |
adjust = packet_get_int(); |
packet_done(); |
packet_done(); |
debug("channel %d: rcvd adjust %d", id, adjust); |
debug2("channel %d: rcvd adjust %d", id, adjust); |
c->remote_window += adjust; |
c->remote_window += adjust; |
} |
} |
|
|
|
|
switch (channels[i].type) { |
switch (channels[i].type) { |
case SSH_CHANNEL_AUTH_SOCKET: |
case SSH_CHANNEL_AUTH_SOCKET: |
close(channels[i].sock); |
close(channels[i].sock); |
remove(channels[i].path); |
unlink(channels[i].path); |
channel_free(i); |
channel_free(i); |
break; |
break; |
case SSH_CHANNEL_PORT_LISTENER: |
case SSH_CHANNEL_PORT_LISTENER: |
|
case SSH_CHANNEL_RPORT_LISTENER: |
case SSH_CHANNEL_X11_LISTENER: |
case SSH_CHANNEL_X11_LISTENER: |
close(channels[i].sock); |
close(channels[i].sock); |
channel_free(i); |
channel_free(i); |
|
|
channel_close_fds(&channels[i]); |
channel_close_fds(&channels[i]); |
} |
} |
|
|
/* Returns the maximum file descriptor number used by the channels. */ |
|
|
|
int |
|
channel_max_fd() |
|
{ |
|
return channel_max_fd_value; |
|
} |
|
|
|
/* Returns true if any channel is still open. */ |
/* Returns true if any channel is still open. */ |
|
|
int |
int |
channel_still_open() |
channel_still_open() |
{ |
{ |
unsigned int i; |
u_int i; |
for (i = 0; i < channels_alloc; i++) |
for (i = 0; i < channels_alloc; i++) |
switch (channels[i].type) { |
switch (channels[i].type) { |
case SSH_CHANNEL_FREE: |
case SSH_CHANNEL_FREE: |
case SSH_CHANNEL_X11_LISTENER: |
case SSH_CHANNEL_X11_LISTENER: |
case SSH_CHANNEL_PORT_LISTENER: |
case SSH_CHANNEL_PORT_LISTENER: |
|
case SSH_CHANNEL_RPORT_LISTENER: |
case SSH_CHANNEL_CLOSED: |
case SSH_CHANNEL_CLOSED: |
case SSH_CHANNEL_AUTH_SOCKET: |
case SSH_CHANNEL_AUTH_SOCKET: |
|
case SSH_CHANNEL_CONNECTING: /* XXX ??? */ |
continue; |
continue; |
case SSH_CHANNEL_LARVAL: |
case SSH_CHANNEL_LARVAL: |
if (!compat20) |
if (!compat20) |
|
|
case SSH_CHANNEL_FREE: |
case SSH_CHANNEL_FREE: |
case SSH_CHANNEL_X11_LISTENER: |
case SSH_CHANNEL_X11_LISTENER: |
case SSH_CHANNEL_PORT_LISTENER: |
case SSH_CHANNEL_PORT_LISTENER: |
|
case SSH_CHANNEL_RPORT_LISTENER: |
case SSH_CHANNEL_CLOSED: |
case SSH_CHANNEL_CLOSED: |
case SSH_CHANNEL_AUTH_SOCKET: |
case SSH_CHANNEL_AUTH_SOCKET: |
continue; |
continue; |
case SSH_CHANNEL_LARVAL: |
case SSH_CHANNEL_LARVAL: |
case SSH_CHANNEL_OPENING: |
case SSH_CHANNEL_OPENING: |
|
case SSH_CHANNEL_CONNECTING: |
case SSH_CHANNEL_OPEN: |
case SSH_CHANNEL_OPEN: |
case SSH_CHANNEL_X11_OPEN: |
case SSH_CHANNEL_X11_OPEN: |
case SSH_CHANNEL_INPUT_DRAINING: |
case SSH_CHANNEL_INPUT_DRAINING: |
|
|
* Initiate forwarding of connections to local port "port" through the secure |
* Initiate forwarding of connections to local port "port" through the secure |
* channel to host:port from remote side. |
* channel to host:port from remote side. |
*/ |
*/ |
|
int |
|
channel_request_local_forwarding(u_short listen_port, const char *host_to_connect, |
|
u_short port_to_connect, int gateway_ports) |
|
{ |
|
return channel_request_forwarding( |
|
NULL, listen_port, |
|
host_to_connect, port_to_connect, |
|
gateway_ports, /*remote_fwd*/ 0); |
|
} |
|
|
void |
/* |
channel_request_local_forwarding(u_short port, const char *host, |
* If 'remote_fwd' is true we have a '-R style' listener for protocol 2 |
u_short host_port, int gateway_ports) |
* (SSH_CHANNEL_RPORT_LISTENER). |
|
*/ |
|
int |
|
channel_request_forwarding( |
|
const char *listen_address, u_short listen_port, |
|
const char *host_to_connect, u_short port_to_connect, |
|
int gateway_ports, int remote_fwd) |
{ |
{ |
int success, ch, sock, on = 1; |
int success, ch, sock, on = 1, ctype; |
struct addrinfo hints, *ai, *aitop; |
struct addrinfo hints, *ai, *aitop; |
char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
|
const char *host; |
struct linger linger; |
struct linger linger; |
|
|
if (strlen(host) > sizeof(channels[0].path) - 1) |
success = 0; |
packet_disconnect("Forward host name too long."); |
|
|
|
|
if (remote_fwd) { |
|
host = listen_address; |
|
ctype = SSH_CHANNEL_RPORT_LISTENER; |
|
} else { |
|
host = host_to_connect; |
|
ctype =SSH_CHANNEL_PORT_LISTENER; |
|
} |
|
|
|
if (strlen(host) > sizeof(channels[0].path) - 1) { |
|
error("Forward host name too long."); |
|
return success; |
|
} |
|
|
|
/* XXX listen_address is currently ignored */ |
/* |
/* |
* getaddrinfo returns a loopback address if the hostname is |
* getaddrinfo returns a loopback address if the hostname is |
* set to NULL and hints.ai_flags is not AI_PASSIVE |
* set to NULL and hints.ai_flags is not AI_PASSIVE |
|
|
hints.ai_family = IPv4or6; |
hints.ai_family = IPv4or6; |
hints.ai_flags = gateway_ports ? AI_PASSIVE : 0; |
hints.ai_flags = gateway_ports ? AI_PASSIVE : 0; |
hints.ai_socktype = SOCK_STREAM; |
hints.ai_socktype = SOCK_STREAM; |
snprintf(strport, sizeof strport, "%d", port); |
snprintf(strport, sizeof strport, "%d", listen_port); |
if (getaddrinfo(NULL, strport, &hints, &aitop) != 0) |
if (getaddrinfo(NULL, strport, &hints, &aitop) != 0) |
packet_disconnect("getaddrinfo: fatal error"); |
packet_disconnect("getaddrinfo: fatal error"); |
|
|
success = 0; |
|
for (ai = aitop; ai; ai = ai->ai_next) { |
for (ai = aitop; ai; ai = ai->ai_next) { |
if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
continue; |
continue; |
if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
error("channel_request_local_forwarding: getnameinfo failed"); |
error("channel_request_forwarding: getnameinfo failed"); |
continue; |
continue; |
} |
} |
/* Create a port to listen for the host. */ |
/* Create a port to listen for the host. */ |
|
|
continue; |
continue; |
} |
} |
/* Allocate a channel number for the socket. */ |
/* Allocate a channel number for the socket. */ |
ch = channel_new( |
ch = channel_new("port listener", ctype, sock, sock, -1, |
"port listener", SSH_CHANNEL_PORT_LISTENER, |
|
sock, sock, -1, |
|
CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
0, xstrdup("port listener")); |
0, xstrdup("port listener"), 1); |
strlcpy(channels[ch].path, host, sizeof(channels[ch].path)); |
strlcpy(channels[ch].path, host, sizeof(channels[ch].path)); |
channels[ch].host_port = host_port; |
channels[ch].host_port = port_to_connect; |
channels[ch].listening_port = port; |
channels[ch].listening_port = listen_port; |
success = 1; |
success = 1; |
} |
} |
if (success == 0) |
if (success == 0) |
packet_disconnect("cannot listen port: %d", port); |
error("channel_request_forwarding: cannot listen to port: %d", |
|
listen_port); |
freeaddrinfo(aitop); |
freeaddrinfo(aitop); |
|
return success; |
} |
} |
|
|
/* |
/* |
|
|
*/ |
*/ |
|
|
void |
void |
channel_request_remote_forwarding(u_short listen_port, const char *host_to_connect, |
channel_request_remote_forwarding(u_short listen_port, |
u_short port_to_connect) |
const char *host_to_connect, u_short port_to_connect) |
{ |
{ |
int payload_len; |
int payload_len, type, success = 0; |
|
|
/* Record locally that connection to this host/port is permitted. */ |
/* Record locally that connection to this host/port is permitted. */ |
if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) |
if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) |
fatal("channel_request_remote_forwarding: too many forwards"); |
fatal("channel_request_remote_forwarding: too many forwards"); |
|
|
permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); |
|
permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; |
|
permitted_opens[num_permitted_opens].listen_port = listen_port; |
|
num_permitted_opens++; |
|
|
|
/* Send the forward request to the remote side. */ |
/* Send the forward request to the remote side. */ |
if (compat20) { |
if (compat20) { |
const char *address_to_bind = "0.0.0.0"; |
const char *address_to_bind = "0.0.0.0"; |
|
|
packet_put_char(0); /* boolean: want reply */ |
packet_put_char(0); /* boolean: want reply */ |
packet_put_cstring(address_to_bind); |
packet_put_cstring(address_to_bind); |
packet_put_int(listen_port); |
packet_put_int(listen_port); |
|
packet_send(); |
|
packet_write_wait(); |
|
/* Assume that server accepts the request */ |
|
success = 1; |
} else { |
} else { |
packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); |
packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); |
packet_put_int(listen_port); |
packet_put_int(listen_port); |
|
|
packet_put_int(port_to_connect); |
packet_put_int(port_to_connect); |
packet_send(); |
packet_send(); |
packet_write_wait(); |
packet_write_wait(); |
/* |
|
* Wait for response from the remote side. It will send a disconnect |
/* Wait for response from the remote side. */ |
* message on failure, and we will never see it here. |
type = packet_read(&payload_len); |
*/ |
switch (type) { |
packet_read_expect(&payload_len, SSH_SMSG_SUCCESS); |
case SSH_SMSG_SUCCESS: |
|
success = 1; |
|
break; |
|
case SSH_SMSG_FAILURE: |
|
log("Warning: Server denied remote port forwarding."); |
|
break; |
|
default: |
|
/* Unknown packet */ |
|
packet_disconnect("Protocol error for port forward request:" |
|
"received packet type %d.", type); |
|
} |
} |
} |
|
if (success) { |
|
permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); |
|
permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; |
|
permitted_opens[num_permitted_opens].listen_port = listen_port; |
|
num_permitted_opens++; |
|
} |
} |
} |
|
|
/* |
/* |
|
|
if (port < IPPORT_RESERVED && !is_root) |
if (port < IPPORT_RESERVED && !is_root) |
packet_disconnect("Requested forwarding of port %d but user is not root.", |
packet_disconnect("Requested forwarding of port %d but user is not root.", |
port); |
port); |
/* |
/* Initiate forwarding */ |
* Initiate forwarding, |
|
*/ |
|
channel_request_local_forwarding(port, hostname, host_port, gateway_ports); |
channel_request_local_forwarding(port, hostname, host_port, gateway_ports); |
|
|
/* Free the argument string. */ |
/* Free the argument string. */ |
|
|
error("socket: %.100s", strerror(errno)); |
error("socket: %.100s", strerror(errno)); |
continue; |
continue; |
} |
} |
|
if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0) |
|
fatal("connect_to: F_SETFL: %s", strerror(errno)); |
/* Connect to the host/port. */ |
/* Connect to the host/port. */ |
if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 && |
|
errno != EINPROGRESS) { |
error("connect %.100s port %s: %.100s", ntop, strport, |
error("connect %.100s port %s: %.100s", ntop, strport, |
strerror(errno)); |
strerror(errno)); |
close(sock); |
close(sock); |
continue; /* fail -- try next */ |
continue; /* fail -- try next */ |
} |
} |
break; /* success */ |
break; /* success */ |
|
|
} |
} |
freeaddrinfo(aitop); |
freeaddrinfo(aitop); |
if (!ai) { |
if (!ai) { |
error("connect %.100s port %d: failed.", host, host_port); |
error("connect %.100s port %d: failed.", host, host_port); |
return -1; |
return -1; |
} |
} |
/* success */ |
/* success */ |
return sock; |
return sock; |
} |
} |
|
int |
|
channel_connect_by_listen_adress(u_short listen_port) |
|
{ |
|
int i; |
|
for (i = 0; i < num_permitted_opens; i++) |
|
if (permitted_opens[i].listen_port == listen_port) |
|
return channel_connect_to( |
|
permitted_opens[i].host_to_connect, |
|
permitted_opens[i].port_to_connect); |
|
error("WARNING: Server requests forwarding for unknown listen_port %d", |
|
listen_port); |
|
return -1; |
|
} |
|
|
/* |
/* |
* This is called after receiving PORT_OPEN message. This attempts to |
* This is called after receiving PORT_OPEN message. This attempts to |
* connect to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION |
* connect to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION |
|
|
*/ |
*/ |
|
|
void |
void |
channel_input_port_open(int type, int plen) |
channel_input_port_open(int type, int plen, void *ctxt) |
{ |
{ |
u_short host_port; |
u_short host_port; |
char *host, *originator_string; |
char *host, *originator_string; |
int remote_channel, sock = -1, newch, i, denied; |
int remote_channel, sock = -1, newch, i, denied; |
unsigned int host_len, originator_len; |
u_int host_len, originator_len; |
|
|
/* Get remote channel number. */ |
/* Get remote channel number. */ |
remote_channel = packet_get_int(); |
remote_channel = packet_get_int(); |
|
|
sock = denied ? -1 : channel_connect_to(host, host_port); |
sock = denied ? -1 : channel_connect_to(host, host_port); |
if (sock > 0) { |
if (sock > 0) { |
/* Allocate a channel for this connection. */ |
/* Allocate a channel for this connection. */ |
newch = channel_allocate(SSH_CHANNEL_OPEN, sock, originator_string); |
newch = channel_allocate(SSH_CHANNEL_CONNECTING, |
|
sock, originator_string); |
|
/*XXX delay answer? */ |
channels[newch].remote_id = remote_channel; |
channels[newch].remote_id = remote_channel; |
|
|
packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
|
|
if (num_socks == NUM_SOCKS) |
if (num_socks == NUM_SOCKS) |
break; |
break; |
} |
} |
|
freeaddrinfo(aitop); |
if (num_socks > 0) |
if (num_socks > 0) |
break; |
break; |
} |
} |
|
|
(void) channel_new("x11 listener", |
(void) channel_new("x11 listener", |
SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, |
CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, |
0, xstrdup("X11 inet listener")); |
0, xstrdup("X11 inet listener"), 1); |
} |
} |
|
|
/* Return a suitable value for the DISPLAY environment variable. */ |
/* Return a suitable value for the DISPLAY environment variable. */ |
|
|
|
|
static |
static |
int |
int |
connect_local_xsocket(unsigned int dnr) |
connect_local_xsocket(u_int dnr) |
{ |
{ |
static const char *const x_sockets[] = { |
static const char *const x_sockets[] = { |
X_UNIX_PATH "%u", |
X_UNIX_PATH "%u", |
|
|
*/ |
*/ |
|
|
void |
void |
x11_input_open(int type, int plen) |
x11_input_open(int type, int plen, void *ctxt) |
{ |
{ |
int remote_channel, sock = 0, newch; |
int remote_channel, sock = 0, newch; |
char *remote_host; |
char *remote_host; |
unsigned int remote_len; |
u_int remote_len; |
|
|
/* Get remote channel number. */ |
/* Get remote channel number. */ |
remote_channel = packet_get_int(); |
remote_channel = packet_get_int(); |
|
|
} |
} |
} |
} |
|
|
|
/* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
|
void |
|
deny_input_open(int type, int plen, void *ctxt) |
|
{ |
|
int rchan = packet_get_int(); |
|
switch(type){ |
|
case SSH_SMSG_AGENT_OPEN: |
|
error("Warning: ssh server tried agent forwarding."); |
|
break; |
|
case SSH_SMSG_X11_OPEN: |
|
error("Warning: ssh server tried X11 forwarding."); |
|
break; |
|
default: |
|
error("deny_input_open: type %d plen %d", type, plen); |
|
break; |
|
} |
|
error("Warning: this is probably a break in attempt by a malicious server."); |
|
packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
|
packet_put_int(rchan); |
|
packet_send(); |
|
} |
|
|
/* |
/* |
* Requests forwarding of X11 connections, generates fake authentication |
* Requests forwarding of X11 connections, generates fake authentication |
* data, and enables authentication spoofing. |
* data, and enables authentication spoofing. |
|
|
x11_request_forwarding_with_spoofing(int client_session_id, |
x11_request_forwarding_with_spoofing(int client_session_id, |
const char *proto, const char *data) |
const char *proto, const char *data) |
{ |
{ |
unsigned int data_len = (unsigned int) strlen(data) / 2; |
u_int data_len = (u_int) strlen(data) / 2; |
unsigned int i, value; |
u_int i, value, len; |
char *new_data; |
char *new_data; |
int screen_number; |
int screen_number; |
const char *cp; |
const char *cp; |
|
|
x11_fake_data_len = data_len; |
x11_fake_data_len = data_len; |
|
|
/* Convert the fake data into hex. */ |
/* Convert the fake data into hex. */ |
new_data = xmalloc(2 * data_len + 1); |
len = 2 * data_len + 1; |
|
new_data = xmalloc(len); |
for (i = 0; i < data_len; i++) |
for (i = 0; i < data_len; i++) |
sprintf(new_data + 2 * i, "%02x", (unsigned char) x11_fake_data[i]); |
snprintf(new_data + 2 * i, len - 2 * i, |
|
"%02x", (u_char) x11_fake_data[i]); |
|
|
/* Send the request packet. */ |
/* Send the request packet. */ |
if (compat20) { |
if (compat20) { |
|
|
void |
void |
cleanup_socket(void) |
cleanup_socket(void) |
{ |
{ |
remove(channel_forwarded_auth_socket_name); |
unlink(channel_forwarded_auth_socket_name); |
rmdir(channel_forwarded_auth_socket_dir); |
rmdir(channel_forwarded_auth_socket_dir); |
} |
} |
|
|
/* |
/* |
* This if called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server. |
* This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server. |
* This starts forwarding authentication requests. |
* This starts forwarding authentication requests. |
*/ |
*/ |
|
|
void |
int |
auth_input_request_forwarding(struct passwd * pw) |
auth_input_request_forwarding(struct passwd * pw) |
{ |
{ |
int sock, newch; |
int sock, newch; |
|
|
strlcpy(channel_forwarded_auth_socket_dir, "/tmp/ssh-XXXXXXXX", MAX_SOCKET_NAME); |
strlcpy(channel_forwarded_auth_socket_dir, "/tmp/ssh-XXXXXXXX", MAX_SOCKET_NAME); |
|
|
/* Create private directory for socket */ |
/* Create private directory for socket */ |
if (mkdtemp(channel_forwarded_auth_socket_dir) == NULL) |
if (mkdtemp(channel_forwarded_auth_socket_dir) == NULL) { |
packet_disconnect("mkdtemp: %.100s", strerror(errno)); |
packet_send_debug("Agent forwarding disabled: mkdtemp() failed: %.100s", |
|
strerror(errno)); |
|
restore_uid(); |
|
xfree(channel_forwarded_auth_socket_name); |
|
xfree(channel_forwarded_auth_socket_dir); |
|
channel_forwarded_auth_socket_name = NULL; |
|
channel_forwarded_auth_socket_dir = NULL; |
|
return 0; |
|
} |
snprintf(channel_forwarded_auth_socket_name, MAX_SOCKET_NAME, "%s/agent.%d", |
snprintf(channel_forwarded_auth_socket_name, MAX_SOCKET_NAME, "%s/agent.%d", |
channel_forwarded_auth_socket_dir, (int) getpid()); |
channel_forwarded_auth_socket_dir, (int) getpid()); |
|
|
|
|
packet_disconnect("listen: %.100s", strerror(errno)); |
packet_disconnect("listen: %.100s", strerror(errno)); |
|
|
/* Allocate a channel for the authentication agent socket. */ |
/* Allocate a channel for the authentication agent socket. */ |
newch = channel_allocate(SSH_CHANNEL_AUTH_SOCKET, sock, |
newch = channel_new("auth socket", |
xstrdup("auth socket")); |
SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, |
|
CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, |
|
0, xstrdup("auth socket"), 1); |
|
|
strlcpy(channels[newch].path, channel_forwarded_auth_socket_name, |
strlcpy(channels[newch].path, channel_forwarded_auth_socket_name, |
sizeof(channels[newch].path)); |
sizeof(channels[newch].path)); |
|
return 1; |
} |
} |
|
|
/* This is called to process an SSH_SMSG_AGENT_OPEN message. */ |
/* This is called to process an SSH_SMSG_AGENT_OPEN message. */ |
|
|
void |
void |
auth_input_open_request(int type, int plen) |
auth_input_open_request(int type, int plen, void *ctxt) |
{ |
{ |
int remch, sock, newch; |
int remch, sock, newch; |
char *dummyname; |
char *dummyname; |
|
|
} |
} |
c->dettach_user = NULL; |
c->dettach_user = NULL; |
} |
} |
|
void |
|
channel_register_filter(int id, channel_filter_fn *fn) |
|
{ |
|
Channel *c = channel_lookup(id); |
|
if (c == NULL) { |
|
log("channel_register_filter: %d: bad id", id); |
|
return; |
|
} |
|
c->input_filter = fn; |
|
} |
|
|
void |
void |
channel_set_fds(int id, int rfd, int wfd, int efd, int extusage) |
channel_set_fds(int id, int rfd, int wfd, int efd, |
|
int extusage, int nonblock) |
{ |
{ |
Channel *c = channel_lookup(id); |
Channel *c = channel_lookup(id); |
if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
fatal("channel_activate for non-larval channel %d.", id); |
fatal("channel_activate for non-larval channel %d.", id); |
|
channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
channel_register_fds(c, rfd, wfd, efd, extusage); |
|
c->type = SSH_CHANNEL_OPEN; |
c->type = SSH_CHANNEL_OPEN; |
/* XXX window size? */ |
/* XXX window size? */ |
c->local_window = c->local_window_max = c->local_maxpacket/2; |
c->local_window = c->local_window_max = c->local_maxpacket * 2; |
packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
packet_put_int(c->remote_id); |
packet_put_int(c->remote_id); |
packet_put_int(c->local_window); |
packet_put_int(c->local_window); |