Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 4 | * All rights reserved |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 5 | * This file contains functions for generic socket connection forwarding. |
| 6 | * There is also code for initiating connection forwarding for X11 connections, |
| 7 | * arbitrary tcp/ip connections, and the authentication agent connection. |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 8 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 9 | * As far as I am concerned, the code I have written for this software |
| 10 | * can be used freely for any purpose. Any derived versions of this |
| 11 | * software must be clearly marked as such, and if the derived work is |
| 12 | * incompatible with the protocol description in the RFC file, it must be |
| 13 | * called by a name other than "ssh" or "Secure Shell". |
| 14 | * |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 15 | * SSH2 support added by Markus Friedl. |
Damien Miller | a90fc08 | 2002-01-22 23:19:38 +1100 | [diff] [blame] | 16 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 17 | * Copyright (c) 1999 Dug Song. All rights reserved. |
| 18 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. |
| 19 | * |
| 20 | * Redistribution and use in source and binary forms, with or without |
| 21 | * modification, are permitted provided that the following conditions |
| 22 | * are met: |
| 23 | * 1. Redistributions of source code must retain the above copyright |
| 24 | * notice, this list of conditions and the following disclaimer. |
| 25 | * 2. Redistributions in binary form must reproduce the above copyright |
| 26 | * notice, this list of conditions and the following disclaimer in the |
| 27 | * documentation and/or other materials provided with the distribution. |
| 28 | * |
| 29 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 30 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 31 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 32 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 33 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 34 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 35 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 36 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 37 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 38 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 39 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 40 | |
| 41 | #include "includes.h" |
Damien Miller | 574c41f | 2006-03-15 11:40:10 +1100 | [diff] [blame] | 42 | RCSID("$OpenBSD: channels.c,v 1.235 2006/02/20 16:36:14 stevesk Exp $"); |
Damien Miller | 17e91c0 | 2006-03-15 11:28:34 +1100 | [diff] [blame] | 43 | |
| 44 | #include <sys/ioctl.h> |
Damien Miller | 574c41f | 2006-03-15 11:40:10 +1100 | [diff] [blame] | 45 | #include <sys/types.h> |
| 46 | #include <sys/un.h> |
Damien Miller | 99bd21e | 2006-03-15 11:11:28 +1100 | [diff] [blame] | 47 | |
| 48 | #include <termios.h> |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 49 | |
| 50 | #include "ssh.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 51 | #include "ssh1.h" |
| 52 | #include "ssh2.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 53 | #include "packet.h" |
| 54 | #include "xmalloc.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 55 | #include "log.h" |
| 56 | #include "misc.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 57 | #include "channels.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 58 | #include "compat.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 59 | #include "canohost.h" |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 60 | #include "key.h" |
| 61 | #include "authfd.h" |
Damien Miller | 3afe375 | 2001-12-21 12:39:51 +1100 | [diff] [blame] | 62 | #include "pathnames.h" |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 63 | #include "bufaux.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 64 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 65 | /* -- channel core */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 66 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 67 | /* |
| 68 | * Pointer to an array containing all allocated channels. The array is |
| 69 | * dynamically extended as needed. |
| 70 | */ |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 71 | static Channel **channels = NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 72 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 73 | /* |
| 74 | * Size of the channel array. All slots of the array must always be |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 75 | * initialized (at least the type field); unused slots set to NULL |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 76 | */ |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 77 | static u_int channels_alloc = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 78 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 79 | /* |
| 80 | * Maximum file descriptor value used in any of the channels. This is |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 81 | * updated in channel_new. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 82 | */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 83 | static int channel_max_fd = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 84 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 85 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 86 | /* -- tcp forwarding */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 87 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 88 | /* |
| 89 | * Data structure for storing which hosts are permitted for forward requests. |
| 90 | * The local sides of any remote forwards are stored in this array to prevent |
| 91 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local |
| 92 | * network (which might be behind a firewall). |
| 93 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 94 | typedef struct { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 95 | char *host_to_connect; /* Connect to 'host'. */ |
| 96 | u_short port_to_connect; /* Connect to 'port'. */ |
| 97 | u_short listen_port; /* Remote side should listen port number. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 98 | } ForwardPermission; |
| 99 | |
| 100 | /* List of all permitted host/port pairs to connect. */ |
| 101 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 102 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 103 | /* Number of permitted host/port pairs in the array. */ |
| 104 | static int num_permitted_opens = 0; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 105 | /* |
| 106 | * If this is true, all opens are permitted. This is the case on the server |
| 107 | * on which we have to trust the client anyway, and the user could do |
| 108 | * anything after logging in anyway. |
| 109 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 110 | static int all_opens_permitted = 0; |
| 111 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 112 | |
| 113 | /* -- X11 forwarding */ |
| 114 | |
| 115 | /* Maximum number of fake X11 displays to try. */ |
| 116 | #define MAX_DISPLAYS 1000 |
| 117 | |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 118 | /* Saved X11 local (client) display. */ |
| 119 | static char *x11_saved_display = NULL; |
| 120 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 121 | /* Saved X11 authentication protocol name. */ |
| 122 | static char *x11_saved_proto = NULL; |
| 123 | |
| 124 | /* Saved X11 authentication data. This is the real data. */ |
| 125 | static char *x11_saved_data = NULL; |
| 126 | static u_int x11_saved_data_len = 0; |
| 127 | |
| 128 | /* |
| 129 | * Fake X11 authentication data. This is what the server will be sending us; |
| 130 | * we should replace any occurrences of this by the real data. |
| 131 | */ |
| 132 | static char *x11_fake_data = NULL; |
| 133 | static u_int x11_fake_data_len; |
| 134 | |
| 135 | |
| 136 | /* -- agent forwarding */ |
| 137 | |
| 138 | #define NUM_SOCKS 10 |
| 139 | |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 140 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
Ben Lindstrom | 908afed | 2001-10-03 17:34:59 +0000 | [diff] [blame] | 141 | static int IPv4or6 = AF_UNSPEC; |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 142 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 143 | /* helper */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 144 | static void port_open_helper(Channel *c, char *rtype); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 145 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 146 | /* -- channel core */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 147 | |
| 148 | Channel * |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 149 | channel_by_id(int id) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 150 | { |
| 151 | Channel *c; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 152 | |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 153 | if (id < 0 || (u_int)id >= channels_alloc) { |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 154 | logit("channel_by_id: %d: bad id", id); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 155 | return NULL; |
| 156 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 157 | c = channels[id]; |
| 158 | if (c == NULL) { |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 159 | logit("channel_by_id: %d: bad id: channel free", id); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 160 | return NULL; |
| 161 | } |
| 162 | return c; |
| 163 | } |
| 164 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 165 | /* |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 166 | * Returns the channel if it is allowed to receive protocol messages. |
| 167 | * Private channels, like listening sockets, may not receive messages. |
| 168 | */ |
| 169 | Channel * |
| 170 | channel_lookup(int id) |
| 171 | { |
| 172 | Channel *c; |
| 173 | |
| 174 | if ((c = channel_by_id(id)) == NULL) |
| 175 | return (NULL); |
| 176 | |
| 177 | switch(c->type) { |
| 178 | case SSH_CHANNEL_X11_OPEN: |
| 179 | case SSH_CHANNEL_LARVAL: |
| 180 | case SSH_CHANNEL_CONNECTING: |
| 181 | case SSH_CHANNEL_DYNAMIC: |
| 182 | case SSH_CHANNEL_OPENING: |
| 183 | case SSH_CHANNEL_OPEN: |
| 184 | case SSH_CHANNEL_INPUT_DRAINING: |
| 185 | case SSH_CHANNEL_OUTPUT_DRAINING: |
| 186 | return (c); |
| 187 | break; |
| 188 | } |
| 189 | logit("Non-public channel %d, type %d.", id, c->type); |
| 190 | return (NULL); |
| 191 | } |
| 192 | |
| 193 | /* |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 194 | * Register filedescriptors for a channel, used when allocating a channel or |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 195 | * when the channel consumer/producer is ready, e.g. shell exec'd |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 196 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 197 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 198 | static void |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 199 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
| 200 | int extusage, int nonblock) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 201 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 202 | /* Update the maximum file descriptor value. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 203 | channel_max_fd = MAX(channel_max_fd, rfd); |
| 204 | channel_max_fd = MAX(channel_max_fd, wfd); |
| 205 | channel_max_fd = MAX(channel_max_fd, efd); |
| 206 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 207 | /* XXX set close-on-exec -markus */ |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 208 | |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 209 | c->rfd = rfd; |
| 210 | c->wfd = wfd; |
| 211 | c->sock = (rfd == wfd) ? rfd : -1; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 212 | c->ctl_fd = -1; /* XXX: set elsewhere */ |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 213 | c->efd = efd; |
| 214 | c->extended_usage = extusage; |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 215 | |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 216 | /* XXX ugly hack: nonblock is only set by the server */ |
| 217 | if (nonblock && isatty(c->rfd)) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 218 | debug2("channel %d: rfd %d isatty", c->self, c->rfd); |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 219 | c->isatty = 1; |
| 220 | if (!isatty(c->wfd)) { |
Ben Lindstrom | cc74df7 | 2001-03-05 06:20:14 +0000 | [diff] [blame] | 221 | error("channel %d: wfd %d is not a tty?", |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 222 | c->self, c->wfd); |
| 223 | } |
| 224 | } else { |
| 225 | c->isatty = 0; |
| 226 | } |
Ben Lindstrom | beb5f33 | 2002-07-22 15:28:53 +0000 | [diff] [blame] | 227 | c->wfd_isatty = isatty(c->wfd); |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 228 | |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 229 | /* enable nonblocking mode */ |
| 230 | if (nonblock) { |
| 231 | if (rfd != -1) |
| 232 | set_nonblock(rfd); |
| 233 | if (wfd != -1) |
| 234 | set_nonblock(wfd); |
| 235 | if (efd != -1) |
| 236 | set_nonblock(efd); |
| 237 | } |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 238 | } |
| 239 | |
| 240 | /* |
| 241 | * Allocate a new channel object and set its type and socket. This will cause |
| 242 | * remote_name to be freed. |
| 243 | */ |
| 244 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 245 | Channel * |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 246 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
Ben Lindstrom | 4fed2be | 2002-06-25 23:17:36 +0000 | [diff] [blame] | 247 | u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock) |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 248 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 249 | int found; |
| 250 | u_int i; |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 251 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 252 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 253 | /* Do initial allocation if this is the first call. */ |
| 254 | if (channels_alloc == 0) { |
| 255 | channels_alloc = 10; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 256 | channels = xmalloc(channels_alloc * sizeof(Channel *)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 257 | for (i = 0; i < channels_alloc; i++) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 258 | channels[i] = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 259 | } |
| 260 | /* Try to find a free slot where to put the new channel. */ |
| 261 | for (found = -1, i = 0; i < channels_alloc; i++) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 262 | if (channels[i] == NULL) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 263 | /* Found a free slot. */ |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 264 | found = (int)i; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 265 | break; |
| 266 | } |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 267 | if (found < 0) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 268 | /* There are no free slots. Take last+1 slot and expand the array. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 269 | found = channels_alloc; |
Damien Miller | 9403aa2 | 2002-06-26 19:14:43 +1000 | [diff] [blame] | 270 | if (channels_alloc > 10000) |
| 271 | fatal("channel_new: internal error: channels_alloc %d " |
| 272 | "too big.", channels_alloc); |
Damien Miller | 5efcecc | 2003-09-17 07:31:14 +1000 | [diff] [blame] | 273 | channels = xrealloc(channels, |
| 274 | (channels_alloc + 10) * sizeof(Channel *)); |
| 275 | channels_alloc += 10; |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 276 | debug2("channel: expanding %d", channels_alloc); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 277 | for (i = found; i < channels_alloc; i++) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 278 | channels[i] = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 279 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 280 | /* Initialize and return new channel. */ |
| 281 | c = channels[found] = xmalloc(sizeof(Channel)); |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 282 | memset(c, 0, sizeof(Channel)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 283 | buffer_init(&c->input); |
| 284 | buffer_init(&c->output); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 285 | buffer_init(&c->extended); |
Damien Miller | 5144df9 | 2002-01-22 23:28:45 +1100 | [diff] [blame] | 286 | c->ostate = CHAN_OUTPUT_OPEN; |
| 287 | c->istate = CHAN_INPUT_OPEN; |
| 288 | c->flags = 0; |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 289 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 290 | c->self = found; |
| 291 | c->type = type; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 292 | c->ctype = ctype; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 293 | c->local_window = window; |
| 294 | c->local_window_max = window; |
| 295 | c->local_consumed = 0; |
| 296 | c->local_maxpacket = maxpack; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 297 | c->remote_id = -1; |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 298 | c->remote_name = xstrdup(remote_name); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 299 | c->remote_window = 0; |
| 300 | c->remote_maxpacket = 0; |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 301 | c->force_drain = 0; |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 302 | c->single_connection = 0; |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 303 | c->detach_user = NULL; |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 304 | c->detach_close = 0; |
Damien Miller | 67f0bc0 | 2002-02-05 12:23:08 +1100 | [diff] [blame] | 305 | c->confirm = NULL; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 306 | c->confirm_ctx = NULL; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 307 | c->input_filter = NULL; |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 308 | c->output_filter = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 309 | debug("channel %d: new [%s]", found, remote_name); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 310 | return c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 311 | } |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 312 | |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 313 | static int |
| 314 | channel_find_maxfd(void) |
| 315 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 316 | u_int i; |
| 317 | int max = 0; |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 318 | Channel *c; |
| 319 | |
| 320 | for (i = 0; i < channels_alloc; i++) { |
| 321 | c = channels[i]; |
| 322 | if (c != NULL) { |
| 323 | max = MAX(max, c->rfd); |
| 324 | max = MAX(max, c->wfd); |
| 325 | max = MAX(max, c->efd); |
| 326 | } |
| 327 | } |
| 328 | return max; |
| 329 | } |
| 330 | |
| 331 | int |
| 332 | channel_close_fd(int *fdp) |
| 333 | { |
| 334 | int ret = 0, fd = *fdp; |
| 335 | |
| 336 | if (fd != -1) { |
| 337 | ret = close(fd); |
| 338 | *fdp = -1; |
| 339 | if (fd == channel_max_fd) |
| 340 | channel_max_fd = channel_find_maxfd(); |
| 341 | } |
| 342 | return ret; |
| 343 | } |
| 344 | |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 345 | /* Close all channel fd/socket. */ |
| 346 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 347 | static void |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 348 | channel_close_fds(Channel *c) |
| 349 | { |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 350 | debug3("channel %d: close_fds r %d w %d e %d c %d", |
| 351 | c->self, c->rfd, c->wfd, c->efd, c->ctl_fd); |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 352 | |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 353 | channel_close_fd(&c->sock); |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 354 | channel_close_fd(&c->ctl_fd); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 355 | channel_close_fd(&c->rfd); |
| 356 | channel_close_fd(&c->wfd); |
| 357 | channel_close_fd(&c->efd); |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 358 | } |
| 359 | |
| 360 | /* Free the channel and close its fd/socket. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 361 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 362 | void |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 363 | channel_free(Channel *c) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 364 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 365 | char *s; |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 366 | u_int i, n; |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 367 | |
| 368 | for (n = 0, i = 0; i < channels_alloc; i++) |
| 369 | if (channels[i]) |
| 370 | n++; |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 371 | debug("channel %d: free: %s, nchannels %u", c->self, |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 372 | c->remote_name ? c->remote_name : "???", n); |
Ben Lindstrom | 6c3ae2b | 2000-12-30 03:25:14 +0000 | [diff] [blame] | 373 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 374 | s = channel_open_message(); |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 375 | debug3("channel %d: status: %s", c->self, s); |
Ben Lindstrom | 6c3ae2b | 2000-12-30 03:25:14 +0000 | [diff] [blame] | 376 | xfree(s); |
| 377 | |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 378 | if (c->sock != -1) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 379 | shutdown(c->sock, SHUT_RDWR); |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 380 | if (c->ctl_fd != -1) |
| 381 | shutdown(c->ctl_fd, SHUT_RDWR); |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 382 | channel_close_fds(c); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 383 | buffer_free(&c->input); |
| 384 | buffer_free(&c->output); |
| 385 | buffer_free(&c->extended); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 386 | if (c->remote_name) { |
| 387 | xfree(c->remote_name); |
| 388 | c->remote_name = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 389 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 390 | channels[c->self] = NULL; |
| 391 | xfree(c); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 392 | } |
| 393 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 394 | void |
Ben Lindstrom | 601e436 | 2001-06-21 03:19:23 +0000 | [diff] [blame] | 395 | channel_free_all(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 396 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 397 | u_int i; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 398 | |
Ben Lindstrom | 601e436 | 2001-06-21 03:19:23 +0000 | [diff] [blame] | 399 | for (i = 0; i < channels_alloc; i++) |
| 400 | if (channels[i] != NULL) |
| 401 | channel_free(channels[i]); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 402 | } |
| 403 | |
| 404 | /* |
| 405 | * Closes the sockets/fds of all channels. This is used to close extra file |
| 406 | * descriptors after a fork. |
| 407 | */ |
| 408 | |
| 409 | void |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 410 | channel_close_all(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 411 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 412 | u_int i; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 413 | |
| 414 | for (i = 0; i < channels_alloc; i++) |
| 415 | if (channels[i] != NULL) |
| 416 | channel_close_fds(channels[i]); |
| 417 | } |
| 418 | |
| 419 | /* |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 420 | * Stop listening to channels. |
| 421 | */ |
| 422 | |
| 423 | void |
| 424 | channel_stop_listening(void) |
| 425 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 426 | u_int i; |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 427 | Channel *c; |
| 428 | |
| 429 | for (i = 0; i < channels_alloc; i++) { |
| 430 | c = channels[i]; |
| 431 | if (c != NULL) { |
| 432 | switch (c->type) { |
| 433 | case SSH_CHANNEL_AUTH_SOCKET: |
| 434 | case SSH_CHANNEL_PORT_LISTENER: |
| 435 | case SSH_CHANNEL_RPORT_LISTENER: |
| 436 | case SSH_CHANNEL_X11_LISTENER: |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 437 | channel_close_fd(&c->sock); |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 438 | channel_free(c); |
| 439 | break; |
| 440 | } |
| 441 | } |
| 442 | } |
| 443 | } |
| 444 | |
| 445 | /* |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 446 | * Returns true if no channel has too much buffered data, and false if one or |
| 447 | * more channel is overfull. |
| 448 | */ |
| 449 | |
| 450 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 451 | channel_not_very_much_buffered_data(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 452 | { |
| 453 | u_int i; |
| 454 | Channel *c; |
| 455 | |
| 456 | for (i = 0; i < channels_alloc; i++) { |
| 457 | c = channels[i]; |
| 458 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 459 | #if 0 |
| 460 | if (!compat20 && |
| 461 | buffer_len(&c->input) > packet_get_maxsize()) { |
Damien Miller | 275295e | 2003-01-08 14:04:09 +1100 | [diff] [blame] | 462 | debug2("channel %d: big input buffer %d", |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 463 | c->self, buffer_len(&c->input)); |
| 464 | return 0; |
| 465 | } |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 466 | #endif |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 467 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
Darren Tucker | 502d384 | 2003-06-28 12:38:01 +1000 | [diff] [blame] | 468 | debug2("channel %d: big output buffer %u > %u", |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 469 | c->self, buffer_len(&c->output), |
| 470 | packet_get_maxsize()); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 471 | return 0; |
| 472 | } |
| 473 | } |
| 474 | } |
| 475 | return 1; |
| 476 | } |
| 477 | |
| 478 | /* Returns true if any channel is still open. */ |
| 479 | |
| 480 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 481 | channel_still_open(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 482 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 483 | u_int i; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 484 | Channel *c; |
| 485 | |
| 486 | for (i = 0; i < channels_alloc; i++) { |
| 487 | c = channels[i]; |
| 488 | if (c == NULL) |
| 489 | continue; |
| 490 | switch (c->type) { |
| 491 | case SSH_CHANNEL_X11_LISTENER: |
| 492 | case SSH_CHANNEL_PORT_LISTENER: |
| 493 | case SSH_CHANNEL_RPORT_LISTENER: |
| 494 | case SSH_CHANNEL_CLOSED: |
| 495 | case SSH_CHANNEL_AUTH_SOCKET: |
| 496 | case SSH_CHANNEL_DYNAMIC: |
| 497 | case SSH_CHANNEL_CONNECTING: |
| 498 | case SSH_CHANNEL_ZOMBIE: |
| 499 | continue; |
| 500 | case SSH_CHANNEL_LARVAL: |
| 501 | if (!compat20) |
| 502 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); |
| 503 | continue; |
| 504 | case SSH_CHANNEL_OPENING: |
| 505 | case SSH_CHANNEL_OPEN: |
| 506 | case SSH_CHANNEL_X11_OPEN: |
| 507 | return 1; |
| 508 | case SSH_CHANNEL_INPUT_DRAINING: |
| 509 | case SSH_CHANNEL_OUTPUT_DRAINING: |
| 510 | if (!compat13) |
| 511 | fatal("cannot happen: OUT_DRAIN"); |
| 512 | return 1; |
| 513 | default: |
| 514 | fatal("channel_still_open: bad channel type %d", c->type); |
| 515 | /* NOTREACHED */ |
| 516 | } |
| 517 | } |
| 518 | return 0; |
| 519 | } |
| 520 | |
| 521 | /* Returns the id of an open channel suitable for keepaliving */ |
| 522 | |
| 523 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 524 | channel_find_open(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 525 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 526 | u_int i; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 527 | Channel *c; |
| 528 | |
| 529 | for (i = 0; i < channels_alloc; i++) { |
| 530 | c = channels[i]; |
Damien Miller | 3bbd878 | 2004-06-18 22:23:22 +1000 | [diff] [blame] | 531 | if (c == NULL || c->remote_id < 0) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 532 | continue; |
| 533 | switch (c->type) { |
| 534 | case SSH_CHANNEL_CLOSED: |
| 535 | case SSH_CHANNEL_DYNAMIC: |
| 536 | case SSH_CHANNEL_X11_LISTENER: |
| 537 | case SSH_CHANNEL_PORT_LISTENER: |
| 538 | case SSH_CHANNEL_RPORT_LISTENER: |
| 539 | case SSH_CHANNEL_OPENING: |
| 540 | case SSH_CHANNEL_CONNECTING: |
| 541 | case SSH_CHANNEL_ZOMBIE: |
| 542 | continue; |
| 543 | case SSH_CHANNEL_LARVAL: |
| 544 | case SSH_CHANNEL_AUTH_SOCKET: |
| 545 | case SSH_CHANNEL_OPEN: |
| 546 | case SSH_CHANNEL_X11_OPEN: |
| 547 | return i; |
| 548 | case SSH_CHANNEL_INPUT_DRAINING: |
| 549 | case SSH_CHANNEL_OUTPUT_DRAINING: |
| 550 | if (!compat13) |
| 551 | fatal("cannot happen: OUT_DRAIN"); |
| 552 | return i; |
| 553 | default: |
| 554 | fatal("channel_find_open: bad channel type %d", c->type); |
| 555 | /* NOTREACHED */ |
| 556 | } |
| 557 | } |
| 558 | return -1; |
| 559 | } |
| 560 | |
| 561 | |
| 562 | /* |
| 563 | * Returns a message describing the currently open forwarded connections, |
| 564 | * suitable for sending to the client. The message contains crlf pairs for |
| 565 | * newlines. |
| 566 | */ |
| 567 | |
| 568 | char * |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 569 | channel_open_message(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 570 | { |
| 571 | Buffer buffer; |
| 572 | Channel *c; |
| 573 | char buf[1024], *cp; |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 574 | u_int i; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 575 | |
| 576 | buffer_init(&buffer); |
| 577 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); |
| 578 | buffer_append(&buffer, buf, strlen(buf)); |
| 579 | for (i = 0; i < channels_alloc; i++) { |
| 580 | c = channels[i]; |
| 581 | if (c == NULL) |
| 582 | continue; |
| 583 | switch (c->type) { |
| 584 | case SSH_CHANNEL_X11_LISTENER: |
| 585 | case SSH_CHANNEL_PORT_LISTENER: |
| 586 | case SSH_CHANNEL_RPORT_LISTENER: |
| 587 | case SSH_CHANNEL_CLOSED: |
| 588 | case SSH_CHANNEL_AUTH_SOCKET: |
| 589 | case SSH_CHANNEL_ZOMBIE: |
| 590 | continue; |
| 591 | case SSH_CHANNEL_LARVAL: |
| 592 | case SSH_CHANNEL_OPENING: |
| 593 | case SSH_CHANNEL_CONNECTING: |
| 594 | case SSH_CHANNEL_DYNAMIC: |
| 595 | case SSH_CHANNEL_OPEN: |
| 596 | case SSH_CHANNEL_X11_OPEN: |
| 597 | case SSH_CHANNEL_INPUT_DRAINING: |
| 598 | case SSH_CHANNEL_OUTPUT_DRAINING: |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 599 | snprintf(buf, sizeof buf, |
| 600 | " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n", |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 601 | c->self, c->remote_name, |
| 602 | c->type, c->remote_id, |
| 603 | c->istate, buffer_len(&c->input), |
| 604 | c->ostate, buffer_len(&c->output), |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 605 | c->rfd, c->wfd, c->ctl_fd); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 606 | buffer_append(&buffer, buf, strlen(buf)); |
| 607 | continue; |
| 608 | default: |
| 609 | fatal("channel_open_message: bad channel type %d", c->type); |
| 610 | /* NOTREACHED */ |
| 611 | } |
| 612 | } |
| 613 | buffer_append(&buffer, "\0", 1); |
| 614 | cp = xstrdup(buffer_ptr(&buffer)); |
| 615 | buffer_free(&buffer); |
| 616 | return cp; |
| 617 | } |
| 618 | |
| 619 | void |
| 620 | channel_send_open(int id) |
| 621 | { |
| 622 | Channel *c = channel_lookup(id); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 623 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 624 | if (c == NULL) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 625 | logit("channel_send_open: %d: bad id", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 626 | return; |
| 627 | } |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 628 | debug2("channel %d: send open", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 629 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 630 | packet_put_cstring(c->ctype); |
| 631 | packet_put_int(c->self); |
| 632 | packet_put_int(c->local_window); |
| 633 | packet_put_int(c->local_maxpacket); |
| 634 | packet_send(); |
| 635 | } |
| 636 | |
| 637 | void |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 638 | channel_request_start(int id, char *service, int wantconfirm) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 639 | { |
Ben Lindstrom | 1d568f9 | 2002-12-23 02:44:36 +0000 | [diff] [blame] | 640 | Channel *c = channel_lookup(id); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 641 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 642 | if (c == NULL) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 643 | logit("channel_request_start: %d: unknown channel id", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 644 | return; |
| 645 | } |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 646 | debug2("channel %d: request %s confirm %d", id, service, wantconfirm); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 647 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
| 648 | packet_put_int(c->remote_id); |
| 649 | packet_put_cstring(service); |
| 650 | packet_put_char(wantconfirm); |
| 651 | } |
| 652 | void |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 653 | channel_register_confirm(int id, channel_callback_fn *fn, void *ctx) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 654 | { |
| 655 | Channel *c = channel_lookup(id); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 656 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 657 | if (c == NULL) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 658 | logit("channel_register_comfirm: %d: bad id", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 659 | return; |
| 660 | } |
Damien Miller | 67f0bc0 | 2002-02-05 12:23:08 +1100 | [diff] [blame] | 661 | c->confirm = fn; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 662 | c->confirm_ctx = ctx; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 663 | } |
| 664 | void |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 665 | channel_register_cleanup(int id, channel_callback_fn *fn, int do_close) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 666 | { |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 667 | Channel *c = channel_by_id(id); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 668 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 669 | if (c == NULL) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 670 | logit("channel_register_cleanup: %d: bad id", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 671 | return; |
| 672 | } |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 673 | c->detach_user = fn; |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 674 | c->detach_close = do_close; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 675 | } |
| 676 | void |
| 677 | channel_cancel_cleanup(int id) |
| 678 | { |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 679 | Channel *c = channel_by_id(id); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 680 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 681 | if (c == NULL) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 682 | logit("channel_cancel_cleanup: %d: bad id", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 683 | return; |
| 684 | } |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 685 | c->detach_user = NULL; |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 686 | c->detach_close = 0; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 687 | } |
| 688 | void |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 689 | channel_register_filter(int id, channel_infilter_fn *ifn, |
| 690 | channel_outfilter_fn *ofn) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 691 | { |
| 692 | Channel *c = channel_lookup(id); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 693 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 694 | if (c == NULL) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 695 | logit("channel_register_filter: %d: bad id", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 696 | return; |
| 697 | } |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 698 | c->input_filter = ifn; |
| 699 | c->output_filter = ofn; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 700 | } |
| 701 | |
| 702 | void |
| 703 | channel_set_fds(int id, int rfd, int wfd, int efd, |
Damien Miller | 2aa0c19 | 2002-02-19 15:20:08 +1100 | [diff] [blame] | 704 | int extusage, int nonblock, u_int window_max) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 705 | { |
| 706 | Channel *c = channel_lookup(id); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 707 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 708 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
| 709 | fatal("channel_activate for non-larval channel %d.", id); |
| 710 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
| 711 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | 2aa0c19 | 2002-02-19 15:20:08 +1100 | [diff] [blame] | 712 | c->local_window = c->local_window_max = window_max; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 713 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
| 714 | packet_put_int(c->remote_id); |
| 715 | packet_put_int(c->local_window); |
| 716 | packet_send(); |
| 717 | } |
| 718 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 719 | /* |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 720 | * 'channel_pre*' are called just before select() to add any bits relevant to |
| 721 | * channels in the select bitmasks. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 722 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 723 | /* |
| 724 | * 'channel_post*': perform any appropriate operations for channels which |
| 725 | * have events pending. |
| 726 | */ |
| 727 | typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset); |
| 728 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
| 729 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; |
| 730 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 731 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 732 | channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 733 | { |
| 734 | FD_SET(c->sock, readset); |
| 735 | } |
| 736 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 737 | static void |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 738 | channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset) |
| 739 | { |
| 740 | debug3("channel %d: waiting for connection", c->self); |
| 741 | FD_SET(c->sock, writeset); |
| 742 | } |
| 743 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 744 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 745 | channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset) |
| 746 | { |
| 747 | if (buffer_len(&c->input) < packet_get_maxsize()) |
| 748 | FD_SET(c->sock, readset); |
| 749 | if (buffer_len(&c->output) > 0) |
| 750 | FD_SET(c->sock, writeset); |
| 751 | } |
| 752 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 753 | static void |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 754 | channel_pre_open(Channel *c, fd_set * readset, fd_set * writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 755 | { |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 756 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 757 | |
Darren Tucker | 11327cc | 2005-03-14 23:22:25 +1100 | [diff] [blame] | 758 | /* check buffer limits */ |
| 759 | limit = MIN(limit, (BUFFER_MAX_LEN - BUFFER_MAX_CHUNK - CHAN_RBUF)); |
| 760 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 761 | if (c->istate == CHAN_INPUT_OPEN && |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 762 | limit > 0 && |
| 763 | buffer_len(&c->input) < limit) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 764 | FD_SET(c->rfd, readset); |
| 765 | if (c->ostate == CHAN_OUTPUT_OPEN || |
| 766 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { |
| 767 | if (buffer_len(&c->output) > 0) { |
| 768 | FD_SET(c->wfd, writeset); |
| 769 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 770 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
Damien Miller | 0dc1bef | 2005-07-17 17:22:45 +1000 | [diff] [blame] | 771 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
| 772 | c->self, c->efd, buffer_len(&c->extended)); |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 773 | else |
| 774 | chan_obuf_empty(c); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 775 | } |
| 776 | } |
| 777 | /** XXX check close conditions, too */ |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 778 | if (compat20 && c->efd != -1) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 779 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
| 780 | buffer_len(&c->extended) > 0) |
| 781 | FD_SET(c->efd, writeset); |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 782 | else if (!(c->flags & CHAN_EOF_SENT) && |
| 783 | c->extended_usage == CHAN_EXTENDED_READ && |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 784 | buffer_len(&c->extended) < c->remote_window) |
| 785 | FD_SET(c->efd, readset); |
| 786 | } |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 787 | /* XXX: What about efd? races? */ |
Darren Tucker | fc95970 | 2004-07-17 16:12:08 +1000 | [diff] [blame] | 788 | if (compat20 && c->ctl_fd != -1 && |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 789 | c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN) |
| 790 | FD_SET(c->ctl_fd, readset); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 791 | } |
| 792 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 793 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 794 | channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset) |
| 795 | { |
| 796 | if (buffer_len(&c->input) == 0) { |
| 797 | packet_start(SSH_MSG_CHANNEL_CLOSE); |
| 798 | packet_put_int(c->remote_id); |
| 799 | packet_send(); |
| 800 | c->type = SSH_CHANNEL_CLOSED; |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 801 | debug2("channel %d: closing after input drain.", c->self); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 802 | } |
| 803 | } |
| 804 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 805 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 806 | channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset) |
| 807 | { |
| 808 | if (buffer_len(&c->output) == 0) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 809 | chan_mark_dead(c); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 810 | else |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 811 | FD_SET(c->sock, writeset); |
| 812 | } |
| 813 | |
| 814 | /* |
| 815 | * This is a special state for X11 authentication spoofing. An opened X11 |
| 816 | * connection (when authentication spoofing is being done) remains in this |
| 817 | * state until the first packet has been completely read. The authentication |
| 818 | * data in that packet is then substituted by the real data if it matches the |
| 819 | * fake data, and the channel is put into normal mode. |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 820 | * XXX All this happens at the client side. |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 821 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 822 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 823 | static int |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 824 | x11_open_helper(Buffer *b) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 825 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 826 | u_char *ucp; |
| 827 | u_int proto_len, data_len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 828 | |
| 829 | /* Check if the fixed size part of the packet is in buffer. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 830 | if (buffer_len(b) < 12) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 831 | return 0; |
| 832 | |
| 833 | /* Parse the lengths of variable-length fields. */ |
Damien Miller | 708d21c | 2002-01-22 23:18:15 +1100 | [diff] [blame] | 834 | ucp = buffer_ptr(b); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 835 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
| 836 | proto_len = 256 * ucp[6] + ucp[7]; |
| 837 | data_len = 256 * ucp[8] + ucp[9]; |
| 838 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ |
| 839 | proto_len = ucp[6] + 256 * ucp[7]; |
| 840 | data_len = ucp[8] + 256 * ucp[9]; |
| 841 | } else { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 842 | debug2("Initial X11 packet contains bad byte order byte: 0x%x", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 843 | ucp[0]); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 844 | return -1; |
| 845 | } |
| 846 | |
| 847 | /* Check if the whole packet is in buffer. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 848 | if (buffer_len(b) < |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 849 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
| 850 | return 0; |
| 851 | |
| 852 | /* Check if authentication protocol matches. */ |
| 853 | if (proto_len != strlen(x11_saved_proto) || |
| 854 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 855 | debug2("X11 connection uses different authentication protocol."); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 856 | return -1; |
| 857 | } |
| 858 | /* Check if authentication data matches our fake data. */ |
| 859 | if (data_len != x11_fake_data_len || |
| 860 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), |
| 861 | x11_fake_data, x11_fake_data_len) != 0) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 862 | debug2("X11 auth data does not match fake data."); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 863 | return -1; |
| 864 | } |
| 865 | /* Check fake data length */ |
| 866 | if (x11_fake_data_len != x11_saved_data_len) { |
| 867 | error("X11 fake_data_len %d != saved_data_len %d", |
| 868 | x11_fake_data_len, x11_saved_data_len); |
| 869 | return -1; |
| 870 | } |
| 871 | /* |
| 872 | * Received authentication protocol and data match |
| 873 | * our fake data. Substitute the fake data with real |
| 874 | * data. |
| 875 | */ |
| 876 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), |
| 877 | x11_saved_data, x11_saved_data_len); |
| 878 | return 1; |
| 879 | } |
| 880 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 881 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 882 | channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset) |
| 883 | { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 884 | int ret = x11_open_helper(&c->output); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 885 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 886 | if (ret == 1) { |
| 887 | /* Start normal processing for the channel. */ |
| 888 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 889 | channel_pre_open_13(c, readset, writeset); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 890 | } else if (ret == -1) { |
| 891 | /* |
| 892 | * We have received an X11 connection that has bad |
| 893 | * authentication information. |
| 894 | */ |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 895 | logit("X11 connection rejected because of wrong authentication."); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 896 | buffer_clear(&c->input); |
| 897 | buffer_clear(&c->output); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 898 | channel_close_fd(&c->sock); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 899 | c->sock = -1; |
| 900 | c->type = SSH_CHANNEL_CLOSED; |
| 901 | packet_start(SSH_MSG_CHANNEL_CLOSE); |
| 902 | packet_put_int(c->remote_id); |
| 903 | packet_send(); |
| 904 | } |
| 905 | } |
| 906 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 907 | static void |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 908 | channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 909 | { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 910 | int ret = x11_open_helper(&c->output); |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 911 | |
| 912 | /* c->force_drain = 1; */ |
| 913 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 914 | if (ret == 1) { |
| 915 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 916 | channel_pre_open(c, readset, writeset); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 917 | } else if (ret == -1) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 918 | logit("X11 connection rejected because of wrong authentication."); |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 919 | debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
Damien Miller | a90fc08 | 2002-01-22 23:19:38 +1100 | [diff] [blame] | 920 | chan_read_failed(c); |
| 921 | buffer_clear(&c->input); |
| 922 | chan_ibuf_empty(c); |
| 923 | buffer_clear(&c->output); |
| 924 | /* for proto v1, the peer will send an IEOF */ |
| 925 | if (compat20) |
| 926 | chan_write_failed(c); |
| 927 | else |
| 928 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 929 | debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 930 | } |
| 931 | } |
| 932 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 933 | /* try to decode a socks4 header */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 934 | static int |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 935 | channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset) |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 936 | { |
Damien Miller | a10f561 | 2002-09-12 09:49:15 +1000 | [diff] [blame] | 937 | char *p, *host; |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 938 | u_int len, have, i, found; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 939 | char username[256]; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 940 | struct { |
| 941 | u_int8_t version; |
| 942 | u_int8_t command; |
| 943 | u_int16_t dest_port; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 944 | struct in_addr dest_addr; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 945 | } s4_req, s4_rsp; |
| 946 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 947 | debug2("channel %d: decode socks4", c->self); |
Ben Lindstrom | 2b261b9 | 2001-04-17 18:14:34 +0000 | [diff] [blame] | 948 | |
| 949 | have = buffer_len(&c->input); |
| 950 | len = sizeof(s4_req); |
| 951 | if (have < len) |
| 952 | return 0; |
| 953 | p = buffer_ptr(&c->input); |
| 954 | for (found = 0, i = len; i < have; i++) { |
| 955 | if (p[i] == '\0') { |
| 956 | found = 1; |
| 957 | break; |
| 958 | } |
| 959 | if (i > 1024) { |
| 960 | /* the peer is probably sending garbage */ |
| 961 | debug("channel %d: decode socks4: too long", |
| 962 | c->self); |
| 963 | return -1; |
| 964 | } |
| 965 | } |
| 966 | if (!found) |
| 967 | return 0; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 968 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
| 969 | buffer_get(&c->input, (char *)&s4_req.command, 1); |
| 970 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 971 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
Ben Lindstrom | 2b261b9 | 2001-04-17 18:14:34 +0000 | [diff] [blame] | 972 | have = buffer_len(&c->input); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 973 | p = buffer_ptr(&c->input); |
| 974 | len = strlen(p); |
Ben Lindstrom | 6fa9d10 | 2001-04-11 23:08:17 +0000 | [diff] [blame] | 975 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 976 | if (len > have) |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 977 | fatal("channel %d: decode socks4: len %d > have %d", |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 978 | c->self, len, have); |
| 979 | strlcpy(username, p, sizeof(username)); |
| 980 | buffer_consume(&c->input, len); |
| 981 | buffer_consume(&c->input, 1); /* trailing '\0' */ |
| 982 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 983 | host = inet_ntoa(s4_req.dest_addr); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 984 | strlcpy(c->path, host, sizeof(c->path)); |
| 985 | c->host_port = ntohs(s4_req.dest_port); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 986 | |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 987 | debug2("channel %d: dynamic request: socks4 host %s port %u command %u", |
Ben Lindstrom | 6fa9d10 | 2001-04-11 23:08:17 +0000 | [diff] [blame] | 988 | c->self, host, c->host_port, s4_req.command); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 989 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 990 | if (s4_req.command != 1) { |
| 991 | debug("channel %d: cannot handle: socks4 cn %d", |
| 992 | c->self, s4_req.command); |
| 993 | return -1; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 994 | } |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 995 | s4_rsp.version = 0; /* vn: 0 for reply */ |
| 996 | s4_rsp.command = 90; /* cd: req granted */ |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 997 | s4_rsp.dest_port = 0; /* ignored */ |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 998 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 999 | buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp)); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1000 | return 1; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1001 | } |
| 1002 | |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1003 | /* try to decode a socks5 header */ |
| 1004 | #define SSH_SOCKS5_AUTHDONE 0x1000 |
| 1005 | #define SSH_SOCKS5_NOAUTH 0x00 |
| 1006 | #define SSH_SOCKS5_IPV4 0x01 |
| 1007 | #define SSH_SOCKS5_DOMAIN 0x03 |
| 1008 | #define SSH_SOCKS5_IPV6 0x04 |
| 1009 | #define SSH_SOCKS5_CONNECT 0x01 |
| 1010 | #define SSH_SOCKS5_SUCCESS 0x00 |
| 1011 | |
| 1012 | static int |
| 1013 | channel_decode_socks5(Channel *c, fd_set * readset, fd_set * writeset) |
| 1014 | { |
| 1015 | struct { |
| 1016 | u_int8_t version; |
| 1017 | u_int8_t command; |
| 1018 | u_int8_t reserved; |
| 1019 | u_int8_t atyp; |
| 1020 | } s5_req, s5_rsp; |
| 1021 | u_int16_t dest_port; |
| 1022 | u_char *p, dest_addr[255+1]; |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 1023 | u_int have, i, found, nmethods, addrlen, af; |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1024 | |
| 1025 | debug2("channel %d: decode socks5", c->self); |
| 1026 | p = buffer_ptr(&c->input); |
| 1027 | if (p[0] != 0x05) |
| 1028 | return -1; |
| 1029 | have = buffer_len(&c->input); |
| 1030 | if (!(c->flags & SSH_SOCKS5_AUTHDONE)) { |
| 1031 | /* format: ver | nmethods | methods */ |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 1032 | if (have < 2) |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1033 | return 0; |
| 1034 | nmethods = p[1]; |
| 1035 | if (have < nmethods + 2) |
| 1036 | return 0; |
| 1037 | /* look for method: "NO AUTHENTICATION REQUIRED" */ |
| 1038 | for (found = 0, i = 2 ; i < nmethods + 2; i++) { |
| 1039 | if (p[i] == SSH_SOCKS5_NOAUTH ) { |
| 1040 | found = 1; |
| 1041 | break; |
| 1042 | } |
| 1043 | } |
| 1044 | if (!found) { |
| 1045 | debug("channel %d: method SSH_SOCKS5_NOAUTH not found", |
| 1046 | c->self); |
| 1047 | return -1; |
| 1048 | } |
| 1049 | buffer_consume(&c->input, nmethods + 2); |
| 1050 | buffer_put_char(&c->output, 0x05); /* version */ |
| 1051 | buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */ |
| 1052 | FD_SET(c->sock, writeset); |
| 1053 | c->flags |= SSH_SOCKS5_AUTHDONE; |
| 1054 | debug2("channel %d: socks5 auth done", c->self); |
| 1055 | return 0; /* need more */ |
| 1056 | } |
| 1057 | debug2("channel %d: socks5 post auth", c->self); |
| 1058 | if (have < sizeof(s5_req)+1) |
| 1059 | return 0; /* need more */ |
| 1060 | memcpy((char *)&s5_req, p, sizeof(s5_req)); |
| 1061 | if (s5_req.version != 0x05 || |
| 1062 | s5_req.command != SSH_SOCKS5_CONNECT || |
| 1063 | s5_req.reserved != 0x00) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1064 | debug2("channel %d: only socks5 connect supported", c->self); |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1065 | return -1; |
| 1066 | } |
Darren Tucker | 47eede7 | 2005-03-14 23:08:12 +1100 | [diff] [blame] | 1067 | switch (s5_req.atyp){ |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1068 | case SSH_SOCKS5_IPV4: |
| 1069 | addrlen = 4; |
| 1070 | af = AF_INET; |
| 1071 | break; |
| 1072 | case SSH_SOCKS5_DOMAIN: |
| 1073 | addrlen = p[sizeof(s5_req)]; |
| 1074 | af = -1; |
| 1075 | break; |
| 1076 | case SSH_SOCKS5_IPV6: |
| 1077 | addrlen = 16; |
| 1078 | af = AF_INET6; |
| 1079 | break; |
| 1080 | default: |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1081 | debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp); |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1082 | return -1; |
| 1083 | } |
| 1084 | if (have < 4 + addrlen + 2) |
| 1085 | return 0; |
| 1086 | buffer_consume(&c->input, sizeof(s5_req)); |
| 1087 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) |
| 1088 | buffer_consume(&c->input, 1); /* host string length */ |
| 1089 | buffer_get(&c->input, (char *)&dest_addr, addrlen); |
| 1090 | buffer_get(&c->input, (char *)&dest_port, 2); |
| 1091 | dest_addr[addrlen] = '\0'; |
| 1092 | if (s5_req.atyp == SSH_SOCKS5_DOMAIN) |
Darren Tucker | 1f8311c | 2004-05-13 16:39:33 +1000 | [diff] [blame] | 1093 | strlcpy(c->path, (char *)dest_addr, sizeof(c->path)); |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1094 | else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL) |
| 1095 | return -1; |
| 1096 | c->host_port = ntohs(dest_port); |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 1097 | |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1098 | debug2("channel %d: dynamic request: socks5 host %s port %u command %u", |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1099 | c->self, c->path, c->host_port, s5_req.command); |
| 1100 | |
| 1101 | s5_rsp.version = 0x05; |
| 1102 | s5_rsp.command = SSH_SOCKS5_SUCCESS; |
| 1103 | s5_rsp.reserved = 0; /* ignored */ |
| 1104 | s5_rsp.atyp = SSH_SOCKS5_IPV4; |
| 1105 | ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY; |
| 1106 | dest_port = 0; /* ignored */ |
| 1107 | |
| 1108 | buffer_append(&c->output, (char *)&s5_rsp, sizeof(s5_rsp)); |
| 1109 | buffer_append(&c->output, (char *)&dest_addr, sizeof(struct in_addr)); |
| 1110 | buffer_append(&c->output, (char *)&dest_port, sizeof(dest_port)); |
| 1111 | return 1; |
| 1112 | } |
| 1113 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1114 | /* dynamic port forwarding */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1115 | static void |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1116 | channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset) |
| 1117 | { |
| 1118 | u_char *p; |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 1119 | u_int have; |
| 1120 | int ret; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1121 | |
| 1122 | have = buffer_len(&c->input); |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1123 | c->delayed = 0; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1124 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
Ben Lindstrom | c486d88 | 2001-04-11 16:08:34 +0000 | [diff] [blame] | 1125 | /* buffer_dump(&c->input); */ |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1126 | /* check if the fixed size part of the packet is in buffer. */ |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1127 | if (have < 3) { |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1128 | /* need more */ |
| 1129 | FD_SET(c->sock, readset); |
| 1130 | return; |
| 1131 | } |
| 1132 | /* try to guess the protocol */ |
| 1133 | p = buffer_ptr(&c->input); |
| 1134 | switch (p[0]) { |
Ben Lindstrom | 6fa9d10 | 2001-04-11 23:08:17 +0000 | [diff] [blame] | 1135 | case 0x04: |
| 1136 | ret = channel_decode_socks4(c, readset, writeset); |
| 1137 | break; |
Darren Tucker | 46471c9 | 2003-07-03 13:55:19 +1000 | [diff] [blame] | 1138 | case 0x05: |
| 1139 | ret = channel_decode_socks5(c, readset, writeset); |
| 1140 | break; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1141 | default: |
| 1142 | ret = -1; |
| 1143 | break; |
| 1144 | } |
| 1145 | if (ret < 0) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1146 | chan_mark_dead(c); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1147 | } else if (ret == 0) { |
| 1148 | debug2("channel %d: pre_dynamic: need more", c->self); |
| 1149 | /* need more */ |
| 1150 | FD_SET(c->sock, readset); |
| 1151 | } else { |
| 1152 | /* switch to the next state */ |
| 1153 | c->type = SSH_CHANNEL_OPENING; |
| 1154 | port_open_helper(c, "direct-tcpip"); |
| 1155 | } |
| 1156 | } |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1157 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1158 | /* This is our fake X11 server socket. */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1159 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1160 | channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 1161 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1162 | Channel *nc; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1163 | struct sockaddr addr; |
Damien Miller | 398e1cf | 2002-02-05 11:52:13 +1100 | [diff] [blame] | 1164 | int newsock; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1165 | socklen_t addrlen; |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1166 | char buf[16384], *remote_ipaddr; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1167 | int remote_port; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1168 | |
| 1169 | if (FD_ISSET(c->sock, readset)) { |
| 1170 | debug("X11 connection requested."); |
| 1171 | addrlen = sizeof(addr); |
| 1172 | newsock = accept(c->sock, &addr, &addrlen); |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 1173 | if (c->single_connection) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1174 | debug2("single_connection: closing X11 listener."); |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 1175 | channel_close_fd(&c->sock); |
| 1176 | chan_mark_dead(c); |
| 1177 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1178 | if (newsock < 0) { |
| 1179 | error("accept: %.100s", strerror(errno)); |
| 1180 | return; |
| 1181 | } |
Damien Miller | 398e1cf | 2002-02-05 11:52:13 +1100 | [diff] [blame] | 1182 | set_nodelay(newsock); |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1183 | remote_ipaddr = get_peer_ipaddr(newsock); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1184 | remote_port = get_peer_port(newsock); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1185 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1186 | remote_ipaddr, remote_port); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1187 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1188 | nc = channel_new("accepted x11 socket", |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1189 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 1190 | c->local_window_max, c->local_maxpacket, 0, buf, 1); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1191 | if (compat20) { |
| 1192 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 1193 | packet_put_cstring("x11"); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1194 | packet_put_int(nc->self); |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 1195 | packet_put_int(nc->local_window_max); |
| 1196 | packet_put_int(nc->local_maxpacket); |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1197 | /* originator ipaddr and port */ |
| 1198 | packet_put_cstring(remote_ipaddr); |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 1199 | if (datafellows & SSH_BUG_X11FWD) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1200 | debug2("ssh2 x11 bug compat mode"); |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 1201 | } else { |
| 1202 | packet_put_int(remote_port); |
| 1203 | } |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1204 | packet_send(); |
| 1205 | } else { |
| 1206 | packet_start(SSH_SMSG_X11_OPEN); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1207 | packet_put_int(nc->self); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1208 | if (packet_get_protocol_flags() & |
| 1209 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) |
Ben Lindstrom | 664408d | 2001-06-09 01:42:01 +0000 | [diff] [blame] | 1210 | packet_put_cstring(buf); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1211 | packet_send(); |
| 1212 | } |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1213 | xfree(remote_ipaddr); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1214 | } |
| 1215 | } |
| 1216 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1217 | static void |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1218 | port_open_helper(Channel *c, char *rtype) |
| 1219 | { |
| 1220 | int direct; |
| 1221 | char buf[1024]; |
| 1222 | char *remote_ipaddr = get_peer_ipaddr(c->sock); |
Damien Miller | 677257f | 2005-06-17 12:55:03 +1000 | [diff] [blame] | 1223 | int remote_port = get_peer_port(c->sock); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1224 | |
| 1225 | direct = (strcmp(rtype, "direct-tcpip") == 0); |
| 1226 | |
| 1227 | snprintf(buf, sizeof buf, |
| 1228 | "%s: listening port %d for %.100s port %d, " |
| 1229 | "connect from %.200s port %d", |
| 1230 | rtype, c->listening_port, c->path, c->host_port, |
| 1231 | remote_ipaddr, remote_port); |
| 1232 | |
| 1233 | xfree(c->remote_name); |
| 1234 | c->remote_name = xstrdup(buf); |
| 1235 | |
| 1236 | if (compat20) { |
| 1237 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 1238 | packet_put_cstring(rtype); |
| 1239 | packet_put_int(c->self); |
| 1240 | packet_put_int(c->local_window_max); |
| 1241 | packet_put_int(c->local_maxpacket); |
| 1242 | if (direct) { |
| 1243 | /* target host, port */ |
| 1244 | packet_put_cstring(c->path); |
| 1245 | packet_put_int(c->host_port); |
| 1246 | } else { |
| 1247 | /* listen address, port */ |
| 1248 | packet_put_cstring(c->path); |
| 1249 | packet_put_int(c->listening_port); |
| 1250 | } |
| 1251 | /* originator host and port */ |
| 1252 | packet_put_cstring(remote_ipaddr); |
Damien Miller | 677257f | 2005-06-17 12:55:03 +1000 | [diff] [blame] | 1253 | packet_put_int((u_int)remote_port); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1254 | packet_send(); |
| 1255 | } else { |
| 1256 | packet_start(SSH_MSG_PORT_OPEN); |
| 1257 | packet_put_int(c->self); |
| 1258 | packet_put_cstring(c->path); |
| 1259 | packet_put_int(c->host_port); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1260 | if (packet_get_protocol_flags() & |
| 1261 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1262 | packet_put_cstring(c->remote_name); |
| 1263 | packet_send(); |
| 1264 | } |
| 1265 | xfree(remote_ipaddr); |
| 1266 | } |
| 1267 | |
Damien Miller | 5e7fd07 | 2005-11-05 14:53:39 +1100 | [diff] [blame] | 1268 | static void |
| 1269 | channel_set_reuseaddr(int fd) |
| 1270 | { |
| 1271 | int on = 1; |
| 1272 | |
| 1273 | /* |
| 1274 | * Set socket options. |
| 1275 | * Allow local port reuse in TIME_WAIT. |
| 1276 | */ |
| 1277 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) |
| 1278 | error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); |
| 1279 | } |
| 1280 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1281 | /* |
| 1282 | * This socket is listening for connections to a forwarded TCP/IP port. |
| 1283 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1284 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1285 | channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 1286 | { |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1287 | Channel *nc; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1288 | struct sockaddr addr; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1289 | int newsock, nextstate; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1290 | socklen_t addrlen; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1291 | char *rtype; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1292 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1293 | if (FD_ISSET(c->sock, readset)) { |
| 1294 | debug("Connection to port %d forwarding " |
| 1295 | "to %.100s port %d requested.", |
| 1296 | c->listening_port, c->path, c->host_port); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1297 | |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1298 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
| 1299 | nextstate = SSH_CHANNEL_OPENING; |
| 1300 | rtype = "forwarded-tcpip"; |
| 1301 | } else { |
| 1302 | if (c->host_port == 0) { |
| 1303 | nextstate = SSH_CHANNEL_DYNAMIC; |
Damien Miller | d3c04b9 | 2001-10-10 15:04:20 +1000 | [diff] [blame] | 1304 | rtype = "dynamic-tcpip"; |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1305 | } else { |
| 1306 | nextstate = SSH_CHANNEL_OPENING; |
| 1307 | rtype = "direct-tcpip"; |
| 1308 | } |
| 1309 | } |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1310 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1311 | addrlen = sizeof(addr); |
| 1312 | newsock = accept(c->sock, &addr, &addrlen); |
| 1313 | if (newsock < 0) { |
| 1314 | error("accept: %.100s", strerror(errno)); |
| 1315 | return; |
| 1316 | } |
Ben Lindstrom | 1ebd7a5 | 2002-02-26 18:12:51 +0000 | [diff] [blame] | 1317 | set_nodelay(newsock); |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 1318 | nc = channel_new(rtype, nextstate, newsock, newsock, -1, |
| 1319 | c->local_window_max, c->local_maxpacket, 0, rtype, 1); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1320 | nc->listening_port = c->listening_port; |
| 1321 | nc->host_port = c->host_port; |
| 1322 | strlcpy(nc->path, c->path, sizeof(nc->path)); |
| 1323 | |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1324 | if (nextstate == SSH_CHANNEL_DYNAMIC) { |
| 1325 | /* |
| 1326 | * do not call the channel_post handler until |
| 1327 | * this flag has been reset by a pre-handler. |
| 1328 | * otherwise the FD_ISSET calls might overflow |
| 1329 | */ |
| 1330 | nc->delayed = 1; |
| 1331 | } else { |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1332 | port_open_helper(nc, rtype); |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1333 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1334 | } |
| 1335 | } |
| 1336 | |
| 1337 | /* |
| 1338 | * This is the authentication agent socket listening for connections from |
| 1339 | * clients. |
| 1340 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1341 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1342 | channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 1343 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1344 | Channel *nc; |
| 1345 | int newsock; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1346 | struct sockaddr addr; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1347 | socklen_t addrlen; |
| 1348 | |
| 1349 | if (FD_ISSET(c->sock, readset)) { |
| 1350 | addrlen = sizeof(addr); |
| 1351 | newsock = accept(c->sock, &addr, &addrlen); |
| 1352 | if (newsock < 0) { |
| 1353 | error("accept from auth socket: %.100s", strerror(errno)); |
| 1354 | return; |
| 1355 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1356 | nc = channel_new("accepted auth socket", |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1357 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
| 1358 | c->local_window_max, c->local_maxpacket, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 1359 | 0, "accepted auth socket", 1); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1360 | if (compat20) { |
| 1361 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 1362 | packet_put_cstring("auth-agent@openssh.com"); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1363 | packet_put_int(nc->self); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1364 | packet_put_int(c->local_window_max); |
| 1365 | packet_put_int(c->local_maxpacket); |
| 1366 | } else { |
| 1367 | packet_start(SSH_SMSG_AGENT_OPEN); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1368 | packet_put_int(nc->self); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1369 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1370 | packet_send(); |
| 1371 | } |
| 1372 | } |
| 1373 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1374 | static void |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1375 | channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset) |
| 1376 | { |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1377 | int err = 0; |
Ben Lindstrom | 1118095 | 2001-07-04 05:13:35 +0000 | [diff] [blame] | 1378 | socklen_t sz = sizeof(err); |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1379 | |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1380 | if (FD_ISSET(c->sock, writeset)) { |
Ben Lindstrom | 733a235 | 2002-03-05 01:31:28 +0000 | [diff] [blame] | 1381 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1382 | err = errno; |
| 1383 | error("getsockopt SO_ERROR failed"); |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1384 | } |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1385 | if (err == 0) { |
| 1386 | debug("channel %d: connected", c->self); |
| 1387 | c->type = SSH_CHANNEL_OPEN; |
| 1388 | if (compat20) { |
| 1389 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1390 | packet_put_int(c->remote_id); |
| 1391 | packet_put_int(c->self); |
| 1392 | packet_put_int(c->local_window); |
| 1393 | packet_put_int(c->local_maxpacket); |
| 1394 | } else { |
| 1395 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1396 | packet_put_int(c->remote_id); |
| 1397 | packet_put_int(c->self); |
| 1398 | } |
| 1399 | } else { |
| 1400 | debug("channel %d: not connected: %s", |
| 1401 | c->self, strerror(err)); |
| 1402 | if (compat20) { |
| 1403 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); |
| 1404 | packet_put_int(c->remote_id); |
| 1405 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); |
| 1406 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
| 1407 | packet_put_cstring(strerror(err)); |
| 1408 | packet_put_cstring(""); |
| 1409 | } |
| 1410 | } else { |
| 1411 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 1412 | packet_put_int(c->remote_id); |
| 1413 | } |
| 1414 | chan_mark_dead(c); |
| 1415 | } |
| 1416 | packet_send(); |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1417 | } |
| 1418 | } |
| 1419 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1420 | static int |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1421 | channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset) |
| 1422 | { |
Darren Tucker | 11327cc | 2005-03-14 23:22:25 +1100 | [diff] [blame] | 1423 | char buf[CHAN_RBUF]; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1424 | int len; |
| 1425 | |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 1426 | if (c->rfd != -1 && |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1427 | FD_ISSET(c->rfd, readset)) { |
| 1428 | len = read(c->rfd, buf, sizeof(buf)); |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 1429 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
| 1430 | return 1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1431 | if (len <= 0) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1432 | debug2("channel %d: read<=0 rfd %d len %d", |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1433 | c->self, c->rfd, len); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1434 | if (c->type != SSH_CHANNEL_OPEN) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1435 | debug2("channel %d: not open", c->self); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1436 | chan_mark_dead(c); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1437 | return -1; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1438 | } else if (compat13) { |
Damien Miller | 76765c0 | 2002-01-22 23:21:15 +1100 | [diff] [blame] | 1439 | buffer_clear(&c->output); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1440 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1441 | debug2("channel %d: input draining.", c->self); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1442 | } else { |
| 1443 | chan_read_failed(c); |
| 1444 | } |
| 1445 | return -1; |
| 1446 | } |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1447 | if (c->input_filter != NULL) { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1448 | if (c->input_filter(c, buf, len) == -1) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1449 | debug2("channel %d: filter stops", c->self); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1450 | chan_read_failed(c); |
| 1451 | } |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1452 | } else if (c->datagram) { |
| 1453 | buffer_put_string(&c->input, buf, len); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1454 | } else { |
| 1455 | buffer_append(&c->input, buf, len); |
| 1456 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1457 | } |
| 1458 | return 1; |
| 1459 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1460 | static int |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1461 | channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset) |
| 1462 | { |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 1463 | struct termios tio; |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 1464 | u_char *data = NULL, *buf; |
Ben Lindstrom | 6d218f4 | 2001-09-18 05:53:12 +0000 | [diff] [blame] | 1465 | u_int dlen; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1466 | int len; |
| 1467 | |
| 1468 | /* Send buffered output data to the socket. */ |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 1469 | if (c->wfd != -1 && |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1470 | FD_ISSET(c->wfd, writeset) && |
| 1471 | buffer_len(&c->output) > 0) { |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 1472 | if (c->output_filter != NULL) { |
| 1473 | if ((buf = c->output_filter(c, &data, &dlen)) == NULL) { |
| 1474 | debug2("channel %d: filter stops", c->self); |
Damien Miller | e204f6a | 2006-01-31 21:47:15 +1100 | [diff] [blame] | 1475 | if (c->type != SSH_CHANNEL_OPEN) |
| 1476 | chan_mark_dead(c); |
| 1477 | else |
| 1478 | chan_write_failed(c); |
| 1479 | return -1; |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 1480 | } |
| 1481 | } else if (c->datagram) { |
| 1482 | buf = data = buffer_get_string(&c->output, &dlen); |
| 1483 | } else { |
| 1484 | buf = data = buffer_ptr(&c->output); |
| 1485 | dlen = buffer_len(&c->output); |
| 1486 | } |
| 1487 | |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1488 | if (c->datagram) { |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1489 | /* ignore truncated writes, datagrams might get lost */ |
| 1490 | c->local_consumed += dlen + 4; |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 1491 | len = write(c->wfd, buf, dlen); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1492 | xfree(data); |
| 1493 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
| 1494 | return 1; |
| 1495 | if (len <= 0) { |
| 1496 | if (c->type != SSH_CHANNEL_OPEN) |
| 1497 | chan_mark_dead(c); |
| 1498 | else |
| 1499 | chan_write_failed(c); |
| 1500 | return -1; |
| 1501 | } |
| 1502 | return 1; |
| 1503 | } |
Ben Lindstrom | 92ea0ea | 2002-07-04 18:11:09 +0000 | [diff] [blame] | 1504 | #ifdef _AIX |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 1505 | /* XXX: Later AIX versions can't push as much data to tty */ |
Darren Tucker | 240fdfa | 2003-11-22 14:10:02 +1100 | [diff] [blame] | 1506 | if (compat20 && c->wfd_isatty) |
| 1507 | dlen = MIN(dlen, 8*1024); |
Ben Lindstrom | 92ea0ea | 2002-07-04 18:11:09 +0000 | [diff] [blame] | 1508 | #endif |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 1509 | |
| 1510 | len = write(c->wfd, buf, dlen); |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 1511 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
| 1512 | return 1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1513 | if (len <= 0) { |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1514 | if (c->type != SSH_CHANNEL_OPEN) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1515 | debug2("channel %d: not open", c->self); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1516 | chan_mark_dead(c); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1517 | return -1; |
| 1518 | } else if (compat13) { |
Damien Miller | 76765c0 | 2002-01-22 23:21:15 +1100 | [diff] [blame] | 1519 | buffer_clear(&c->output); |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1520 | debug2("channel %d: input draining.", c->self); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1521 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
| 1522 | } else { |
| 1523 | chan_write_failed(c); |
| 1524 | } |
| 1525 | return -1; |
| 1526 | } |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 1527 | if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') { |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1528 | if (tcgetattr(c->wfd, &tio) == 0 && |
| 1529 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { |
| 1530 | /* |
| 1531 | * Simulate echo to reduce the impact of |
Ben Lindstrom | b40204b | 2001-03-05 06:29:44 +0000 | [diff] [blame] | 1532 | * traffic analysis. We need to match the |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 1533 | * size of a SSH2_MSG_CHANNEL_DATA message |
Damien Miller | 077b238 | 2005-12-31 16:22:32 +1100 | [diff] [blame] | 1534 | * (4 byte channel id + buf) |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1535 | */ |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 1536 | packet_send_ignore(4 + len); |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1537 | packet_send(); |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1538 | } |
| 1539 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1540 | buffer_consume(&c->output, len); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1541 | if (compat20 && len > 0) { |
| 1542 | c->local_consumed += len; |
| 1543 | } |
| 1544 | } |
| 1545 | return 1; |
| 1546 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1547 | static int |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1548 | channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset) |
| 1549 | { |
Darren Tucker | 11327cc | 2005-03-14 23:22:25 +1100 | [diff] [blame] | 1550 | char buf[CHAN_RBUF]; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1551 | int len; |
| 1552 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1553 | /** XXX handle drain efd, too */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1554 | if (c->efd != -1) { |
| 1555 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
| 1556 | FD_ISSET(c->efd, writeset) && |
| 1557 | buffer_len(&c->extended) > 0) { |
| 1558 | len = write(c->efd, buffer_ptr(&c->extended), |
| 1559 | buffer_len(&c->extended)); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1560 | debug2("channel %d: written %d to efd %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1561 | c->self, len, c->efd); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1562 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
| 1563 | return 1; |
| 1564 | if (len <= 0) { |
| 1565 | debug2("channel %d: closing write-efd %d", |
| 1566 | c->self, c->efd); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 1567 | channel_close_fd(&c->efd); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1568 | } else { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1569 | buffer_consume(&c->extended, len); |
| 1570 | c->local_consumed += len; |
| 1571 | } |
| 1572 | } else if (c->extended_usage == CHAN_EXTENDED_READ && |
| 1573 | FD_ISSET(c->efd, readset)) { |
| 1574 | len = read(c->efd, buf, sizeof(buf)); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1575 | debug2("channel %d: read %d from efd %d", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1576 | c->self, len, c->efd); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1577 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
| 1578 | return 1; |
| 1579 | if (len <= 0) { |
| 1580 | debug2("channel %d: closing read-efd %d", |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1581 | c->self, c->efd); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 1582 | channel_close_fd(&c->efd); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1583 | } else { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1584 | buffer_append(&c->extended, buf, len); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1585 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1586 | } |
| 1587 | } |
| 1588 | return 1; |
| 1589 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1590 | static int |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1591 | channel_handle_ctl(Channel *c, fd_set * readset, fd_set * writeset) |
| 1592 | { |
| 1593 | char buf[16]; |
| 1594 | int len; |
| 1595 | |
| 1596 | /* Monitor control fd to detect if the slave client exits */ |
| 1597 | if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) { |
| 1598 | len = read(c->ctl_fd, buf, sizeof(buf)); |
| 1599 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
| 1600 | return 1; |
| 1601 | if (len <= 0) { |
| 1602 | debug2("channel %d: ctl read<=0", c->self); |
| 1603 | if (c->type != SSH_CHANNEL_OPEN) { |
| 1604 | debug2("channel %d: not open", c->self); |
| 1605 | chan_mark_dead(c); |
| 1606 | return -1; |
| 1607 | } else { |
| 1608 | chan_read_failed(c); |
| 1609 | chan_write_failed(c); |
| 1610 | } |
| 1611 | return -1; |
| 1612 | } else |
| 1613 | fatal("%s: unexpected data on ctl fd", __func__); |
| 1614 | } |
| 1615 | return 1; |
| 1616 | } |
| 1617 | static int |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1618 | channel_check_window(Channel *c) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1619 | { |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1620 | if (c->type == SSH_CHANNEL_OPEN && |
| 1621 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1622 | c->local_window < c->local_window_max/2 && |
| 1623 | c->local_consumed > 0) { |
| 1624 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
| 1625 | packet_put_int(c->remote_id); |
| 1626 | packet_put_int(c->local_consumed); |
| 1627 | packet_send(); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1628 | debug2("channel %d: window %d sent adjust %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1629 | c->self, c->local_window, |
| 1630 | c->local_consumed); |
| 1631 | c->local_window += c->local_consumed; |
| 1632 | c->local_consumed = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1633 | } |
| 1634 | return 1; |
| 1635 | } |
| 1636 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1637 | static void |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1638 | channel_post_open(Channel *c, fd_set * readset, fd_set * writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1639 | { |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1640 | if (c->delayed) |
| 1641 | return; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1642 | channel_handle_rfd(c, readset, writeset); |
| 1643 | channel_handle_wfd(c, readset, writeset); |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1644 | if (!compat20) |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1645 | return; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1646 | channel_handle_efd(c, readset, writeset); |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 1647 | channel_handle_ctl(c, readset, writeset); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1648 | channel_check_window(c); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1649 | } |
| 1650 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1651 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1652 | channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset) |
| 1653 | { |
| 1654 | int len; |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 1655 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1656 | /* Send buffered output data to the socket. */ |
| 1657 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { |
| 1658 | len = write(c->sock, buffer_ptr(&c->output), |
| 1659 | buffer_len(&c->output)); |
| 1660 | if (len <= 0) |
Damien Miller | 76765c0 | 2002-01-22 23:21:15 +1100 | [diff] [blame] | 1661 | buffer_clear(&c->output); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1662 | else |
| 1663 | buffer_consume(&c->output, len); |
| 1664 | } |
| 1665 | } |
| 1666 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1667 | static void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1668 | channel_handler_init_20(void) |
| 1669 | { |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1670 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1671 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1672 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1673 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1674 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1675 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1676 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1677 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1678 | |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1679 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1680 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1681 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1682 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1683 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1684 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1685 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1686 | } |
| 1687 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1688 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1689 | channel_handler_init_13(void) |
| 1690 | { |
| 1691 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; |
| 1692 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; |
| 1693 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
| 1694 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
| 1695 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
| 1696 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; |
| 1697 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1698 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1699 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1700 | |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1701 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1702 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
| 1703 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
| 1704 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
| 1705 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1706 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1707 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1708 | } |
| 1709 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1710 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1711 | channel_handler_init_15(void) |
| 1712 | { |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1713 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1714 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1715 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
| 1716 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
| 1717 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1718 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1719 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1720 | |
| 1721 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
| 1722 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
| 1723 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1724 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1725 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1726 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1727 | } |
| 1728 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1729 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1730 | channel_handler_init(void) |
| 1731 | { |
| 1732 | int i; |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 1733 | |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1734 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1735 | channel_pre[i] = NULL; |
| 1736 | channel_post[i] = NULL; |
| 1737 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1738 | if (compat20) |
| 1739 | channel_handler_init_20(); |
| 1740 | else if (compat13) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1741 | channel_handler_init_13(); |
| 1742 | else |
| 1743 | channel_handler_init_15(); |
| 1744 | } |
| 1745 | |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 1746 | /* gc dead channels */ |
| 1747 | static void |
| 1748 | channel_garbage_collect(Channel *c) |
| 1749 | { |
| 1750 | if (c == NULL) |
| 1751 | return; |
| 1752 | if (c->detach_user != NULL) { |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 1753 | if (!chan_is_dead(c, c->detach_close)) |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 1754 | return; |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1755 | debug2("channel %d: gc: notify user", c->self); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 1756 | c->detach_user(c->self, NULL); |
| 1757 | /* if we still have a callback */ |
| 1758 | if (c->detach_user != NULL) |
| 1759 | return; |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1760 | debug2("channel %d: gc: user detached", c->self); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 1761 | } |
| 1762 | if (!chan_is_dead(c, 1)) |
| 1763 | return; |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 1764 | debug2("channel %d: garbage collecting", c->self); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 1765 | channel_free(c); |
| 1766 | } |
| 1767 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1768 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1769 | channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset) |
| 1770 | { |
| 1771 | static int did_init = 0; |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 1772 | u_int i; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1773 | Channel *c; |
| 1774 | |
| 1775 | if (!did_init) { |
| 1776 | channel_handler_init(); |
| 1777 | did_init = 1; |
| 1778 | } |
| 1779 | for (i = 0; i < channels_alloc; i++) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1780 | c = channels[i]; |
| 1781 | if (c == NULL) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1782 | continue; |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 1783 | if (ftab[c->type] != NULL) |
| 1784 | (*ftab[c->type])(c, readset, writeset); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 1785 | channel_garbage_collect(c); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1786 | } |
| 1787 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1788 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1789 | /* |
| 1790 | * Allocate/update select bitmasks and add any bits relevant to channels in |
| 1791 | * select bitmasks. |
| 1792 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1793 | void |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 1794 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 1795 | u_int *nallocp, int rekeying) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1796 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 1797 | u_int n, sz; |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1798 | |
| 1799 | n = MAX(*maxfdp, channel_max_fd); |
| 1800 | |
| 1801 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 1802 | /* perhaps check sz < nalloc/2 and shrink? */ |
| 1803 | if (*readsetp == NULL || sz > *nallocp) { |
| 1804 | *readsetp = xrealloc(*readsetp, sz); |
| 1805 | *writesetp = xrealloc(*writesetp, sz); |
| 1806 | *nallocp = sz; |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1807 | } |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 1808 | *maxfdp = n; |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1809 | memset(*readsetp, 0, sz); |
| 1810 | memset(*writesetp, 0, sz); |
| 1811 | |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 1812 | if (!rekeying) |
| 1813 | channel_handler(channel_pre, *readsetp, *writesetp); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1814 | } |
| 1815 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1816 | /* |
| 1817 | * After select, perform any appropriate operations for channels which have |
| 1818 | * events pending. |
| 1819 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1820 | void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1821 | channel_after_select(fd_set * readset, fd_set * writeset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1822 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1823 | channel_handler(channel_post, readset, writeset); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1824 | } |
| 1825 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1826 | |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1827 | /* If there is data to send to the connection, enqueue some of it now. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1828 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1829 | void |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 1830 | channel_output_poll(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1831 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1832 | Channel *c; |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 1833 | u_int i, len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1834 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1835 | for (i = 0; i < channels_alloc; i++) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1836 | c = channels[i]; |
| 1837 | if (c == NULL) |
| 1838 | continue; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1839 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1840 | /* |
| 1841 | * We are only interested in channels that can have buffered |
| 1842 | * incoming data. |
| 1843 | */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1844 | if (compat13) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1845 | if (c->type != SSH_CHANNEL_OPEN && |
| 1846 | c->type != SSH_CHANNEL_INPUT_DRAINING) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1847 | continue; |
| 1848 | } else { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1849 | if (c->type != SSH_CHANNEL_OPEN) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1850 | continue; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1851 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1852 | if (compat20 && |
| 1853 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1854 | /* XXX is this true? */ |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 1855 | debug3("channel %d: will not send data after close", c->self); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1856 | continue; |
| 1857 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1858 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1859 | /* Get the amount of buffered data for this channel. */ |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1860 | if ((c->istate == CHAN_INPUT_OPEN || |
| 1861 | c->istate == CHAN_INPUT_WAIT_DRAIN) && |
| 1862 | (len = buffer_len(&c->input)) > 0) { |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 1863 | if (c->datagram) { |
| 1864 | if (len > 0) { |
| 1865 | u_char *data; |
| 1866 | u_int dlen; |
| 1867 | |
| 1868 | data = buffer_get_string(&c->input, |
| 1869 | &dlen); |
| 1870 | packet_start(SSH2_MSG_CHANNEL_DATA); |
| 1871 | packet_put_int(c->remote_id); |
| 1872 | packet_put_string(data, dlen); |
| 1873 | packet_send(); |
| 1874 | c->remote_window -= dlen + 4; |
| 1875 | xfree(data); |
| 1876 | } |
| 1877 | continue; |
| 1878 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1879 | /* |
| 1880 | * Send some data for the other side over the secure |
| 1881 | * connection. |
| 1882 | */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1883 | if (compat20) { |
| 1884 | if (len > c->remote_window) |
| 1885 | len = c->remote_window; |
| 1886 | if (len > c->remote_maxpacket) |
| 1887 | len = c->remote_maxpacket; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1888 | } else { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1889 | if (packet_is_interactive()) { |
| 1890 | if (len > 1024) |
| 1891 | len = 512; |
| 1892 | } else { |
| 1893 | /* Keep the packets at reasonable size. */ |
| 1894 | if (len > packet_get_maxsize()/2) |
| 1895 | len = packet_get_maxsize()/2; |
| 1896 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1897 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1898 | if (len > 0) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1899 | packet_start(compat20 ? |
| 1900 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1901 | packet_put_int(c->remote_id); |
| 1902 | packet_put_string(buffer_ptr(&c->input), len); |
| 1903 | packet_send(); |
| 1904 | buffer_consume(&c->input, len); |
| 1905 | c->remote_window -= len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1906 | } |
| 1907 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1908 | if (compat13) |
| 1909 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1910 | /* |
| 1911 | * input-buffer is empty and read-socket shutdown: |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 1912 | * tell peer, that we will not send more data: send IEOF. |
| 1913 | * hack for extended data: delay EOF if EFD still in use. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1914 | */ |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 1915 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
Damien Miller | 0dc1bef | 2005-07-17 17:22:45 +1000 | [diff] [blame] | 1916 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
| 1917 | c->self, c->efd, buffer_len(&c->extended)); |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 1918 | else |
| 1919 | chan_ibuf_empty(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1920 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1921 | /* Send extended data, i.e. stderr */ |
| 1922 | if (compat20 && |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 1923 | !(c->flags & CHAN_EOF_SENT) && |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1924 | c->remote_window > 0 && |
| 1925 | (len = buffer_len(&c->extended)) > 0 && |
| 1926 | c->extended_usage == CHAN_EXTENDED_READ) { |
Ben Lindstrom | 4fed2be | 2002-06-25 23:17:36 +0000 | [diff] [blame] | 1927 | debug2("channel %d: rwin %u elen %u euse %d", |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1928 | c->self, c->remote_window, buffer_len(&c->extended), |
| 1929 | c->extended_usage); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1930 | if (len > c->remote_window) |
| 1931 | len = c->remote_window; |
| 1932 | if (len > c->remote_maxpacket) |
| 1933 | len = c->remote_maxpacket; |
| 1934 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); |
| 1935 | packet_put_int(c->remote_id); |
| 1936 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); |
| 1937 | packet_put_string(buffer_ptr(&c->extended), len); |
| 1938 | packet_send(); |
| 1939 | buffer_consume(&c->extended, len); |
| 1940 | c->remote_window -= len; |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1941 | debug2("channel %d: sent ext data %d", c->self, len); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1942 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1943 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1944 | } |
| 1945 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1946 | |
| 1947 | /* -- protocol input */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1948 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1949 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1950 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1951 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1952 | int id; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1953 | char *data; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1954 | u_int data_len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1955 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1956 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1957 | /* Get the channel number and verify it. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1958 | id = packet_get_int(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1959 | c = channel_lookup(id); |
| 1960 | if (c == NULL) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1961 | packet_disconnect("Received data for nonexistent channel %d.", id); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1962 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1963 | /* Ignore any data for non-open channels (might happen on close) */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1964 | if (c->type != SSH_CHANNEL_OPEN && |
| 1965 | c->type != SSH_CHANNEL_X11_OPEN) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1966 | return; |
| 1967 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1968 | /* Get the data. */ |
| 1969 | data = packet_get_string(&data_len); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1970 | |
Damien Miller | a04ad49 | 2004-01-21 11:02:09 +1100 | [diff] [blame] | 1971 | /* |
| 1972 | * Ignore data for protocol > 1.3 if output end is no longer open. |
| 1973 | * For protocol 2 the sending side is reducing its window as it sends |
| 1974 | * data, so we must 'fake' consumption of the data in order to ensure |
| 1975 | * that window updates are sent back. Otherwise the connection might |
| 1976 | * deadlock. |
| 1977 | */ |
| 1978 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) { |
| 1979 | if (compat20) { |
| 1980 | c->local_window -= data_len; |
| 1981 | c->local_consumed += data_len; |
| 1982 | } |
| 1983 | xfree(data); |
| 1984 | return; |
| 1985 | } |
| 1986 | |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1987 | if (compat20) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1988 | if (data_len > c->local_maxpacket) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1989 | logit("channel %d: rcvd big packet %d, maxpack %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1990 | c->self, data_len, c->local_maxpacket); |
| 1991 | } |
| 1992 | if (data_len > c->local_window) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1993 | logit("channel %d: rcvd too much data %d, win %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1994 | c->self, data_len, c->local_window); |
| 1995 | xfree(data); |
| 1996 | return; |
| 1997 | } |
| 1998 | c->local_window -= data_len; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1999 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2000 | packet_check_eom(); |
Damien Miller | d27b947 | 2005-12-13 19:29:02 +1100 | [diff] [blame] | 2001 | if (c->datagram) |
| 2002 | buffer_put_string(&c->output, data, data_len); |
| 2003 | else |
| 2004 | buffer_append(&c->output, data, data_len); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2005 | xfree(data); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2006 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2007 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2008 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2009 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2010 | { |
| 2011 | int id; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2012 | char *data; |
Ben Lindstrom | daa2179 | 2002-06-25 23:15:30 +0000 | [diff] [blame] | 2013 | u_int data_len, tcode; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2014 | Channel *c; |
| 2015 | |
| 2016 | /* Get the channel number and verify it. */ |
| 2017 | id = packet_get_int(); |
| 2018 | c = channel_lookup(id); |
| 2019 | |
| 2020 | if (c == NULL) |
| 2021 | packet_disconnect("Received extended_data for bad channel %d.", id); |
| 2022 | if (c->type != SSH_CHANNEL_OPEN) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 2023 | logit("channel %d: ext data for non open", id); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2024 | return; |
| 2025 | } |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 2026 | if (c->flags & CHAN_EOF_RCVD) { |
| 2027 | if (datafellows & SSH_BUG_EXTEOF) |
| 2028 | debug("channel %d: accepting ext data after eof", id); |
| 2029 | else |
| 2030 | packet_disconnect("Received extended_data after EOF " |
| 2031 | "on channel %d.", id); |
| 2032 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2033 | tcode = packet_get_int(); |
| 2034 | if (c->efd == -1 || |
| 2035 | c->extended_usage != CHAN_EXTENDED_WRITE || |
| 2036 | tcode != SSH2_EXTENDED_DATA_STDERR) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 2037 | logit("channel %d: bad ext data", c->self); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2038 | return; |
| 2039 | } |
| 2040 | data = packet_get_string(&data_len); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2041 | packet_check_eom(); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2042 | if (data_len > c->local_window) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 2043 | logit("channel %d: rcvd too much extended_data %d, win %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2044 | c->self, data_len, c->local_window); |
| 2045 | xfree(data); |
| 2046 | return; |
| 2047 | } |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 2048 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2049 | c->local_window -= data_len; |
| 2050 | buffer_append(&c->extended, data, data_len); |
| 2051 | xfree(data); |
| 2052 | } |
| 2053 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2054 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2055 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2056 | { |
| 2057 | int id; |
| 2058 | Channel *c; |
| 2059 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2060 | id = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2061 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2062 | c = channel_lookup(id); |
| 2063 | if (c == NULL) |
| 2064 | packet_disconnect("Received ieof for nonexistent channel %d.", id); |
| 2065 | chan_rcvd_ieof(c); |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 2066 | |
| 2067 | /* XXX force input close */ |
Damien Miller | a90fc08 | 2002-01-22 23:19:38 +1100 | [diff] [blame] | 2068 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 2069 | debug("channel %d: FORCE input drain", c->self); |
| 2070 | c->istate = CHAN_INPUT_WAIT_DRAIN; |
Damien Miller | 73f1074 | 2002-01-22 23:34:52 +1100 | [diff] [blame] | 2071 | if (buffer_len(&c->input) == 0) |
| 2072 | chan_ibuf_empty(c); |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 2073 | } |
| 2074 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2075 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2076 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2077 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2078 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2079 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2080 | int id; |
| 2081 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2082 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2083 | id = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2084 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2085 | c = channel_lookup(id); |
| 2086 | if (c == NULL) |
| 2087 | packet_disconnect("Received close for nonexistent channel %d.", id); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2088 | |
| 2089 | /* |
| 2090 | * Send a confirmation that we have closed the channel and no more |
| 2091 | * data is coming for it. |
| 2092 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2093 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2094 | packet_put_int(c->remote_id); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2095 | packet_send(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2096 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2097 | /* |
| 2098 | * If the channel is in closed state, we have sent a close request, |
| 2099 | * and the other side will eventually respond with a confirmation. |
| 2100 | * Thus, we cannot free the channel here, because then there would be |
| 2101 | * no-one to receive the confirmation. The channel gets freed when |
| 2102 | * the confirmation arrives. |
| 2103 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2104 | if (c->type != SSH_CHANNEL_CLOSED) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2105 | /* |
| 2106 | * Not a closed channel - mark it as draining, which will |
| 2107 | * cause it to be freed later. |
| 2108 | */ |
Damien Miller | 76765c0 | 2002-01-22 23:21:15 +1100 | [diff] [blame] | 2109 | buffer_clear(&c->input); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2110 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2111 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2112 | } |
| 2113 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2114 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2115 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2116 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2117 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2118 | int id = packet_get_int(); |
| 2119 | Channel *c = channel_lookup(id); |
Damien Miller | 66823cd | 2002-01-22 23:11:38 +1100 | [diff] [blame] | 2120 | |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2121 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2122 | if (c == NULL) |
| 2123 | packet_disconnect("Received oclose for nonexistent channel %d.", id); |
| 2124 | chan_rcvd_oclose(c); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2125 | } |
| 2126 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2127 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2128 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2129 | { |
| 2130 | int id = packet_get_int(); |
| 2131 | Channel *c = channel_lookup(id); |
| 2132 | |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2133 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2134 | if (c == NULL) |
| 2135 | packet_disconnect("Received close confirmation for " |
| 2136 | "out-of-range channel %d.", id); |
| 2137 | if (c->type != SSH_CHANNEL_CLOSED) |
| 2138 | packet_disconnect("Received close confirmation for " |
| 2139 | "non-closed channel %d (type %d).", id, c->type); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2140 | channel_free(c); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2141 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2142 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2143 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2144 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2145 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2146 | int id, remote_id; |
| 2147 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2148 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2149 | id = packet_get_int(); |
| 2150 | c = channel_lookup(id); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2151 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2152 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
| 2153 | packet_disconnect("Received open confirmation for " |
| 2154 | "non-opening channel %d.", id); |
| 2155 | remote_id = packet_get_int(); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2156 | /* Record the remote channel number and mark that the channel is now open. */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2157 | c->remote_id = remote_id; |
| 2158 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2159 | |
| 2160 | if (compat20) { |
| 2161 | c->remote_window = packet_get_int(); |
| 2162 | c->remote_maxpacket = packet_get_int(); |
Damien Miller | 67f0bc0 | 2002-02-05 12:23:08 +1100 | [diff] [blame] | 2163 | if (c->confirm) { |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 2164 | debug2("callback start"); |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 2165 | c->confirm(c->self, c->confirm_ctx); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 2166 | debug2("callback done"); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2167 | } |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 2168 | debug2("channel %d: open confirm rwindow %u rmax %u", c->self, |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2169 | c->remote_window, c->remote_maxpacket); |
| 2170 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2171 | packet_check_eom(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2172 | } |
| 2173 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2174 | static char * |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 2175 | reason2txt(int reason) |
| 2176 | { |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 2177 | switch (reason) { |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 2178 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
| 2179 | return "administratively prohibited"; |
| 2180 | case SSH2_OPEN_CONNECT_FAILED: |
| 2181 | return "connect failed"; |
| 2182 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: |
| 2183 | return "unknown channel type"; |
| 2184 | case SSH2_OPEN_RESOURCE_SHORTAGE: |
| 2185 | return "resource shortage"; |
| 2186 | } |
Ben Lindstrom | e259544 | 2001-06-05 20:01:39 +0000 | [diff] [blame] | 2187 | return "unknown reason"; |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 2188 | } |
| 2189 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2190 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2191 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2192 | { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2193 | int id, reason; |
| 2194 | char *msg = NULL, *lang = NULL; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2195 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2196 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2197 | id = packet_get_int(); |
| 2198 | c = channel_lookup(id); |
| 2199 | |
| 2200 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
| 2201 | packet_disconnect("Received open failure for " |
| 2202 | "non-opening channel %d.", id); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2203 | if (compat20) { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2204 | reason = packet_get_int(); |
Ben Lindstrom | f343674 | 2001-04-29 19:52:00 +0000 | [diff] [blame] | 2205 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2206 | msg = packet_get_string(NULL); |
| 2207 | lang = packet_get_string(NULL); |
| 2208 | } |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 2209 | logit("channel %d: open failed: %s%s%s", id, |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 2210 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2211 | if (msg != NULL) |
| 2212 | xfree(msg); |
| 2213 | if (lang != NULL) |
| 2214 | xfree(lang); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2215 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2216 | packet_check_eom(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2217 | /* Free the channel. This will also close the socket. */ |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2218 | channel_free(c); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2219 | } |
| 2220 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2221 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2222 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2223 | { |
| 2224 | Channel *c; |
Ben Lindstrom | 4fed2be | 2002-06-25 23:17:36 +0000 | [diff] [blame] | 2225 | int id; |
| 2226 | u_int adjust; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2227 | |
| 2228 | if (!compat20) |
| 2229 | return; |
| 2230 | |
| 2231 | /* Get the channel number and verify it. */ |
| 2232 | id = packet_get_int(); |
| 2233 | c = channel_lookup(id); |
| 2234 | |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 2235 | if (c == NULL) { |
| 2236 | logit("Received window adjust for non-open channel %d.", id); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2237 | return; |
| 2238 | } |
| 2239 | adjust = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2240 | packet_check_eom(); |
Ben Lindstrom | 4fed2be | 2002-06-25 23:17:36 +0000 | [diff] [blame] | 2241 | debug2("channel %d: rcvd adjust %u", id, adjust); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2242 | c->remote_window += adjust; |
| 2243 | } |
| 2244 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2245 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2246 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2247 | { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2248 | Channel *c = NULL; |
| 2249 | u_short host_port; |
| 2250 | char *host, *originator_string; |
| 2251 | int remote_id, sock = -1; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2252 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2253 | remote_id = packet_get_int(); |
| 2254 | host = packet_get_string(NULL); |
| 2255 | host_port = packet_get_int(); |
| 2256 | |
| 2257 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { |
| 2258 | originator_string = packet_get_string(NULL); |
| 2259 | } else { |
| 2260 | originator_string = xstrdup("unknown (remote did not supply name)"); |
| 2261 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2262 | packet_check_eom(); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2263 | sock = channel_connect_to(host, host_port); |
| 2264 | if (sock != -1) { |
| 2265 | c = channel_new("connected socket", |
| 2266 | SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0, |
| 2267 | originator_string, 1); |
Damien Miller | 699d003 | 2002-02-08 22:07:16 +1100 | [diff] [blame] | 2268 | c->remote_id = remote_id; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2269 | } |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 2270 | xfree(originator_string); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2271 | if (c == NULL) { |
| 2272 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 2273 | packet_put_int(remote_id); |
| 2274 | packet_send(); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2275 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2276 | xfree(host); |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 2277 | } |
| 2278 | |
| 2279 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2280 | /* -- tcp forwarding */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2281 | |
Ben Lindstrom | 908afed | 2001-10-03 17:34:59 +0000 | [diff] [blame] | 2282 | void |
| 2283 | channel_set_af(int af) |
| 2284 | { |
| 2285 | IPv4or6 = af; |
| 2286 | } |
| 2287 | |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2288 | static int |
| 2289 | channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port, |
| 2290 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2291 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2292 | Channel *c; |
Damien Miller | 5e7fd07 | 2005-11-05 14:53:39 +1100 | [diff] [blame] | 2293 | int sock, r, success = 0, wildcard = 0, is_client; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2294 | struct addrinfo hints, *ai, *aitop; |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2295 | const char *host, *addr; |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2296 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2297 | |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2298 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
| 2299 | listen_addr : host_to_connect; |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2300 | is_client = (type == SSH_CHANNEL_PORT_LISTENER); |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2301 | |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2302 | if (host == NULL) { |
| 2303 | error("No forward host name."); |
Damien Miller | a727030 | 2005-07-06 09:36:05 +1000 | [diff] [blame] | 2304 | return 0; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2305 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2306 | if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2307 | error("Forward host name too long."); |
Damien Miller | a727030 | 2005-07-06 09:36:05 +1000 | [diff] [blame] | 2308 | return 0; |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2309 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2310 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2311 | /* |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2312 | * Determine whether or not a port forward listens to loopback, |
Darren Tucker | 47eede7 | 2005-03-14 23:08:12 +1100 | [diff] [blame] | 2313 | * specified address or wildcard. On the client, a specified bind |
| 2314 | * address will always override gateway_ports. On the server, a |
| 2315 | * gateway_ports of 1 (``yes'') will override the client's |
| 2316 | * specification and force a wildcard bind, whereas a value of 2 |
| 2317 | * (``clientspecified'') will bind to whatever address the client |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2318 | * asked for. |
| 2319 | * |
| 2320 | * Special-case listen_addrs are: |
| 2321 | * |
| 2322 | * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR |
| 2323 | * "" (empty string), "*" -> wildcard v4/v6 |
| 2324 | * "localhost" -> loopback v4/v6 |
| 2325 | */ |
| 2326 | addr = NULL; |
| 2327 | if (listen_addr == NULL) { |
| 2328 | /* No address specified: default to gateway_ports setting */ |
| 2329 | if (gateway_ports) |
| 2330 | wildcard = 1; |
| 2331 | } else if (gateway_ports || is_client) { |
| 2332 | if (((datafellows & SSH_OLD_FORWARD_ADDR) && |
| 2333 | strcmp(listen_addr, "0.0.0.0") == 0) || |
| 2334 | *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 || |
| 2335 | (!is_client && gateway_ports == 1)) |
| 2336 | wildcard = 1; |
| 2337 | else if (strcmp(listen_addr, "localhost") != 0) |
| 2338 | addr = listen_addr; |
| 2339 | } |
| 2340 | |
| 2341 | debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s", |
| 2342 | type, wildcard, (addr == NULL) ? "NULL" : addr); |
| 2343 | |
| 2344 | /* |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2345 | * getaddrinfo returns a loopback address if the hostname is |
| 2346 | * set to NULL and hints.ai_flags is not AI_PASSIVE |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2347 | */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2348 | memset(&hints, 0, sizeof(hints)); |
| 2349 | hints.ai_family = IPv4or6; |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2350 | hints.ai_flags = wildcard ? AI_PASSIVE : 0; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2351 | hints.ai_socktype = SOCK_STREAM; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2352 | snprintf(strport, sizeof strport, "%d", listen_port); |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2353 | if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) { |
| 2354 | if (addr == NULL) { |
| 2355 | /* This really shouldn't happen */ |
| 2356 | packet_disconnect("getaddrinfo: fatal error: %s", |
| 2357 | gai_strerror(r)); |
| 2358 | } else { |
Damien Miller | a727030 | 2005-07-06 09:36:05 +1000 | [diff] [blame] | 2359 | error("channel_setup_fwd_listener: " |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2360 | "getaddrinfo(%.64s): %s", addr, gai_strerror(r)); |
| 2361 | } |
Damien Miller | a727030 | 2005-07-06 09:36:05 +1000 | [diff] [blame] | 2362 | return 0; |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2363 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2364 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2365 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 2366 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 2367 | continue; |
| 2368 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
| 2369 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2370 | error("channel_setup_fwd_listener: getnameinfo failed"); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2371 | continue; |
| 2372 | } |
| 2373 | /* Create a port to listen for the host. */ |
Damien Miller | 2372ace | 2003-05-14 13:42:23 +1000 | [diff] [blame] | 2374 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2375 | if (sock < 0) { |
| 2376 | /* this is no error since kernel may not support ipv6 */ |
| 2377 | verbose("socket: %.100s", strerror(errno)); |
| 2378 | continue; |
| 2379 | } |
Damien Miller | 5e7fd07 | 2005-11-05 14:53:39 +1100 | [diff] [blame] | 2380 | |
| 2381 | channel_set_reuseaddr(sock); |
Damien Miller | e1383ce | 2002-09-19 11:49:37 +1000 | [diff] [blame] | 2382 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2383 | debug("Local forwarding listening on %s port %s.", ntop, strport); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2384 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2385 | /* Bind the socket to the address. */ |
| 2386 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
| 2387 | /* address can be in use ipv6 address is already bound */ |
Damien Miller | 3c7eeb2 | 2000-03-03 22:35:33 +1100 | [diff] [blame] | 2388 | if (!ai->ai_next) |
| 2389 | error("bind: %.100s", strerror(errno)); |
| 2390 | else |
| 2391 | verbose("bind: %.100s", strerror(errno)); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 2392 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2393 | close(sock); |
| 2394 | continue; |
| 2395 | } |
| 2396 | /* Start listening for connections on the socket. */ |
Darren Tucker | 3175eb9 | 2003-12-09 19:15:11 +1100 | [diff] [blame] | 2397 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2398 | error("listen: %.100s", strerror(errno)); |
| 2399 | close(sock); |
| 2400 | continue; |
| 2401 | } |
| 2402 | /* Allocate a channel number for the socket. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2403 | c = channel_new("port listener", type, sock, sock, -1, |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2404 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 2405 | 0, "port listener", 1); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2406 | strlcpy(c->path, host, sizeof(c->path)); |
| 2407 | c->host_port = port_to_connect; |
| 2408 | c->listening_port = listen_port; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2409 | success = 1; |
| 2410 | } |
| 2411 | if (success == 0) |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2412 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2413 | listen_port); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2414 | freeaddrinfo(aitop); |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2415 | return success; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2416 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2417 | |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2418 | int |
| 2419 | channel_cancel_rport_listener(const char *host, u_short port) |
| 2420 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 2421 | u_int i; |
| 2422 | int found = 0; |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2423 | |
Darren Tucker | 47eede7 | 2005-03-14 23:08:12 +1100 | [diff] [blame] | 2424 | for (i = 0; i < channels_alloc; i++) { |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2425 | Channel *c = channels[i]; |
| 2426 | |
| 2427 | if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER && |
| 2428 | strncmp(c->path, host, sizeof(c->path)) == 0 && |
Darren Tucker | fc95970 | 2004-07-17 16:12:08 +1000 | [diff] [blame] | 2429 | c->listening_port == port) { |
Darren Tucker | e6ed839 | 2004-08-29 16:29:44 +1000 | [diff] [blame] | 2430 | debug2("%s: close channel %d", __func__, i); |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2431 | channel_free(c); |
| 2432 | found = 1; |
| 2433 | } |
| 2434 | } |
| 2435 | |
| 2436 | return (found); |
| 2437 | } |
| 2438 | |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2439 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
| 2440 | int |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2441 | channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port, |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2442 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
| 2443 | { |
| 2444 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2445 | listen_host, listen_port, host_to_connect, port_to_connect, |
| 2446 | gateway_ports); |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2447 | } |
| 2448 | |
| 2449 | /* protocol v2 remote port fwd, used by sshd */ |
| 2450 | int |
| 2451 | channel_setup_remote_fwd_listener(const char *listen_address, |
| 2452 | u_short listen_port, int gateway_ports) |
| 2453 | { |
| 2454 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, |
| 2455 | listen_address, listen_port, NULL, 0, gateway_ports); |
| 2456 | } |
| 2457 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2458 | /* |
| 2459 | * Initiate forwarding of connections to port "port" on remote host through |
| 2460 | * the secure channel to host:port from local side. |
| 2461 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2462 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2463 | void |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2464 | channel_request_remote_forwarding(const char *listen_host, u_short listen_port, |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2465 | const char *host_to_connect, u_short port_to_connect) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2466 | { |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 2467 | int type, success = 0; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2468 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2469 | /* Record locally that connection to this host/port is permitted. */ |
| 2470 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) |
| 2471 | fatal("channel_request_remote_forwarding: too many forwards"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2472 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2473 | /* Send the forward request to the remote side. */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2474 | if (compat20) { |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2475 | const char *address_to_bind; |
| 2476 | if (listen_host == NULL) |
| 2477 | address_to_bind = "localhost"; |
| 2478 | else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0) |
| 2479 | address_to_bind = ""; |
| 2480 | else |
| 2481 | address_to_bind = listen_host; |
| 2482 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2483 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
| 2484 | packet_put_cstring("tcpip-forward"); |
Damien Miller | 2797f7f | 2002-04-23 21:09:44 +1000 | [diff] [blame] | 2485 | packet_put_char(1); /* boolean: want reply */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2486 | packet_put_cstring(address_to_bind); |
| 2487 | packet_put_int(listen_port); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2488 | packet_send(); |
| 2489 | packet_write_wait(); |
| 2490 | /* Assume that server accepts the request */ |
| 2491 | success = 1; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2492 | } else { |
| 2493 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2494 | packet_put_int(listen_port); |
Damien Miller | 8bb73be | 2000-04-19 16:26:12 +1000 | [diff] [blame] | 2495 | packet_put_cstring(host_to_connect); |
| 2496 | packet_put_int(port_to_connect); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2497 | packet_send(); |
| 2498 | packet_write_wait(); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2499 | |
| 2500 | /* Wait for response from the remote side. */ |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 2501 | type = packet_read(); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2502 | switch (type) { |
| 2503 | case SSH_SMSG_SUCCESS: |
| 2504 | success = 1; |
| 2505 | break; |
| 2506 | case SSH_SMSG_FAILURE: |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 2507 | logit("Warning: Server denied remote port forwarding."); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2508 | break; |
| 2509 | default: |
| 2510 | /* Unknown packet */ |
| 2511 | packet_disconnect("Protocol error for port forward request:" |
| 2512 | "received packet type %d.", type); |
| 2513 | } |
| 2514 | } |
| 2515 | if (success) { |
| 2516 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); |
| 2517 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; |
| 2518 | permitted_opens[num_permitted_opens].listen_port = listen_port; |
| 2519 | num_permitted_opens++; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2520 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2521 | } |
| 2522 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2523 | /* |
Darren Tucker | fc95970 | 2004-07-17 16:12:08 +1000 | [diff] [blame] | 2524 | * Request cancellation of remote forwarding of connection host:port from |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2525 | * local side. |
| 2526 | */ |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2527 | void |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2528 | channel_request_rforward_cancel(const char *host, u_short port) |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2529 | { |
| 2530 | int i; |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2531 | |
| 2532 | if (!compat20) |
| 2533 | return; |
| 2534 | |
| 2535 | for (i = 0; i < num_permitted_opens; i++) { |
Darren Tucker | fc95970 | 2004-07-17 16:12:08 +1000 | [diff] [blame] | 2536 | if (permitted_opens[i].host_to_connect != NULL && |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2537 | permitted_opens[i].listen_port == port) |
| 2538 | break; |
| 2539 | } |
| 2540 | if (i >= num_permitted_opens) { |
| 2541 | debug("%s: requested forward not found", __func__); |
| 2542 | return; |
| 2543 | } |
| 2544 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
| 2545 | packet_put_cstring("cancel-tcpip-forward"); |
| 2546 | packet_put_char(0); |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2547 | packet_put_cstring(host == NULL ? "" : host); |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2548 | packet_put_int(port); |
| 2549 | packet_send(); |
| 2550 | |
| 2551 | permitted_opens[i].listen_port = 0; |
| 2552 | permitted_opens[i].port_to_connect = 0; |
Damien Miller | 0a0176e | 2005-11-05 15:07:59 +1100 | [diff] [blame] | 2553 | xfree(permitted_opens[i].host_to_connect); |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2554 | permitted_opens[i].host_to_connect = NULL; |
| 2555 | } |
| 2556 | |
| 2557 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2558 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates |
| 2559 | * listening for the port, and sends back a success reply (or disconnect |
| 2560 | * message if there was an error). This never returns if there was an error. |
| 2561 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2562 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2563 | void |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2564 | channel_input_port_forward_request(int is_root, int gateway_ports) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2565 | { |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 2566 | u_short port, host_port; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2567 | char *hostname; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2568 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2569 | /* Get arguments from the packet. */ |
| 2570 | port = packet_get_int(); |
| 2571 | hostname = packet_get_string(NULL); |
| 2572 | host_port = packet_get_int(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2573 | |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 2574 | #ifndef HAVE_CYGWIN |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2575 | /* |
| 2576 | * Check that an unprivileged user is not trying to forward a |
| 2577 | * privileged port. |
| 2578 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2579 | if (port < IPPORT_RESERVED && !is_root) |
Darren Tucker | 9189ff8 | 2003-07-03 13:52:04 +1000 | [diff] [blame] | 2580 | packet_disconnect( |
| 2581 | "Requested forwarding of port %d but user is not root.", |
| 2582 | port); |
| 2583 | if (host_port == 0) |
| 2584 | packet_disconnect("Dynamic forwarding denied."); |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 2585 | #endif |
Darren Tucker | 9189ff8 | 2003-07-03 13:52:04 +1000 | [diff] [blame] | 2586 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2587 | /* Initiate forwarding */ |
Damien Miller | f91ee4c | 2005-03-01 21:24:33 +1100 | [diff] [blame] | 2588 | channel_setup_local_fwd_listener(NULL, port, hostname, |
| 2589 | host_port, gateway_ports); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2590 | |
| 2591 | /* Free the argument string. */ |
| 2592 | xfree(hostname); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2593 | } |
| 2594 | |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2595 | /* |
| 2596 | * Permits opening to any host/port if permitted_opens[] is empty. This is |
| 2597 | * usually called by the server, because the user could connect to any port |
| 2598 | * anyway, and the server has no way to know but to trust the client anyway. |
| 2599 | */ |
| 2600 | void |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 2601 | channel_permit_all_opens(void) |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2602 | { |
| 2603 | if (num_permitted_opens == 0) |
| 2604 | all_opens_permitted = 1; |
| 2605 | } |
| 2606 | |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 2607 | void |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2608 | channel_add_permitted_opens(char *host, int port) |
| 2609 | { |
| 2610 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) |
| 2611 | fatal("channel_request_remote_forwarding: too many forwards"); |
| 2612 | debug("allow port forwarding to host %s port %d", host, port); |
| 2613 | |
| 2614 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); |
| 2615 | permitted_opens[num_permitted_opens].port_to_connect = port; |
| 2616 | num_permitted_opens++; |
| 2617 | |
| 2618 | all_opens_permitted = 0; |
| 2619 | } |
| 2620 | |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 2621 | void |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2622 | channel_clear_permitted_opens(void) |
| 2623 | { |
| 2624 | int i; |
| 2625 | |
| 2626 | for (i = 0; i < num_permitted_opens; i++) |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2627 | if (permitted_opens[i].host_to_connect != NULL) |
| 2628 | xfree(permitted_opens[i].host_to_connect); |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2629 | num_permitted_opens = 0; |
| 2630 | |
| 2631 | } |
| 2632 | |
| 2633 | |
| 2634 | /* return socket to remote host, port */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2635 | static int |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2636 | connect_to(const char *host, u_short port) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2637 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2638 | struct addrinfo hints, *ai, *aitop; |
| 2639 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
| 2640 | int gaierr; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2641 | int sock = -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2642 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2643 | memset(&hints, 0, sizeof(hints)); |
| 2644 | hints.ai_family = IPv4or6; |
| 2645 | hints.ai_socktype = SOCK_STREAM; |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2646 | snprintf(strport, sizeof strport, "%d", port); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2647 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2648 | error("connect_to %.100s: unknown host (%s)", host, |
| 2649 | gai_strerror(gaierr)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2650 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2651 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2652 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 2653 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 2654 | continue; |
| 2655 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
| 2656 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2657 | error("connect_to: getnameinfo failed"); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2658 | continue; |
| 2659 | } |
Damien Miller | 2372ace | 2003-05-14 13:42:23 +1000 | [diff] [blame] | 2660 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2661 | if (sock < 0) { |
Damien Miller | b46b9f3 | 2003-01-10 21:45:12 +1100 | [diff] [blame] | 2662 | if (ai->ai_next == NULL) |
| 2663 | error("socket: %.100s", strerror(errno)); |
| 2664 | else |
| 2665 | verbose("socket: %.100s", strerror(errno)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2666 | continue; |
| 2667 | } |
Damien Miller | 232711f | 2004-06-15 10:35:30 +1000 | [diff] [blame] | 2668 | if (set_nonblock(sock) == -1) |
| 2669 | fatal("%s: set_nonblock(%d)", __func__, sock); |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 2670 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 && |
| 2671 | errno != EINPROGRESS) { |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2672 | error("connect_to %.100s port %s: %.100s", ntop, strport, |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2673 | strerror(errno)); |
| 2674 | close(sock); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 2675 | continue; /* fail -- try next */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2676 | } |
| 2677 | break; /* success */ |
| 2678 | |
| 2679 | } |
| 2680 | freeaddrinfo(aitop); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2681 | if (!ai) { |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2682 | error("connect_to %.100s port %d: failed.", host, port); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2683 | return -1; |
| 2684 | } |
| 2685 | /* success */ |
Ben Lindstrom | 1ebd7a5 | 2002-02-26 18:12:51 +0000 | [diff] [blame] | 2686 | set_nodelay(sock); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2687 | return sock; |
| 2688 | } |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2689 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2690 | int |
Ben Lindstrom | 173e646 | 2001-07-04 05:15:15 +0000 | [diff] [blame] | 2691 | channel_connect_by_listen_address(u_short listen_port) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2692 | { |
| 2693 | int i; |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2694 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2695 | for (i = 0; i < num_permitted_opens; i++) |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2696 | if (permitted_opens[i].host_to_connect != NULL && |
| 2697 | permitted_opens[i].listen_port == listen_port) |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2698 | return connect_to( |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2699 | permitted_opens[i].host_to_connect, |
| 2700 | permitted_opens[i].port_to_connect); |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 2701 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
| 2702 | listen_port); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2703 | return -1; |
| 2704 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2705 | |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2706 | /* Check if connecting to that port is permitted and connect. */ |
| 2707 | int |
| 2708 | channel_connect_to(const char *host, u_short port) |
| 2709 | { |
| 2710 | int i, permit; |
| 2711 | |
| 2712 | permit = all_opens_permitted; |
| 2713 | if (!permit) { |
| 2714 | for (i = 0; i < num_permitted_opens; i++) |
Darren Tucker | e7066df | 2004-05-24 10:18:05 +1000 | [diff] [blame] | 2715 | if (permitted_opens[i].host_to_connect != NULL && |
| 2716 | permitted_opens[i].port_to_connect == port && |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2717 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
| 2718 | permit = 1; |
| 2719 | |
| 2720 | } |
| 2721 | if (!permit) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 2722 | logit("Received request to connect to host %.100s port %d, " |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2723 | "but the request was denied.", host, port); |
| 2724 | return -1; |
| 2725 | } |
| 2726 | return connect_to(host, port); |
| 2727 | } |
| 2728 | |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 2729 | void |
| 2730 | channel_send_window_changes(void) |
| 2731 | { |
Darren Tucker | c7a6fc4 | 2004-08-13 21:18:00 +1000 | [diff] [blame] | 2732 | u_int i; |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 2733 | struct winsize ws; |
| 2734 | |
| 2735 | for (i = 0; i < channels_alloc; i++) { |
Darren Tucker | 47eede7 | 2005-03-14 23:08:12 +1100 | [diff] [blame] | 2736 | if (channels[i] == NULL || !channels[i]->client_tty || |
Damien Miller | 0e220db | 2004-06-15 10:34:08 +1000 | [diff] [blame] | 2737 | channels[i]->type != SSH_CHANNEL_OPEN) |
| 2738 | continue; |
| 2739 | if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0) |
| 2740 | continue; |
| 2741 | channel_request_start(i, "window-change", 0); |
| 2742 | packet_put_int(ws.ws_col); |
| 2743 | packet_put_int(ws.ws_row); |
| 2744 | packet_put_int(ws.ws_xpixel); |
| 2745 | packet_put_int(ws.ws_ypixel); |
| 2746 | packet_send(); |
| 2747 | } |
| 2748 | } |
| 2749 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2750 | /* -- X11 forwarding */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2751 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2752 | /* |
| 2753 | * Creates an internet domain socket for listening for X11 connections. |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2754 | * Returns 0 and a suitable display number for the DISPLAY variable |
| 2755 | * stored in display_numberp , or -1 if an error occurs. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2756 | */ |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2757 | int |
Damien Miller | 95c249f | 2002-02-05 12:11:34 +1100 | [diff] [blame] | 2758 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2759 | int single_connection, u_int *display_numberp, int **chanids) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2760 | { |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 2761 | Channel *nc = NULL; |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 2762 | int display_number, sock; |
| 2763 | u_short port; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2764 | struct addrinfo hints, *ai, *aitop; |
| 2765 | char strport[NI_MAXSERV]; |
| 2766 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2767 | |
Darren Tucker | d3d0fa1 | 2005-10-03 18:03:05 +1000 | [diff] [blame] | 2768 | if (chanids == NULL) |
| 2769 | return -1; |
| 2770 | |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 2771 | for (display_number = x11_display_offset; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 2772 | display_number < MAX_DISPLAYS; |
| 2773 | display_number++) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2774 | port = 6000 + display_number; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2775 | memset(&hints, 0, sizeof(hints)); |
| 2776 | hints.ai_family = IPv4or6; |
Damien Miller | 95c249f | 2002-02-05 12:11:34 +1100 | [diff] [blame] | 2777 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2778 | hints.ai_socktype = SOCK_STREAM; |
| 2779 | snprintf(strport, sizeof strport, "%d", port); |
| 2780 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { |
| 2781 | error("getaddrinfo: %.100s", gai_strerror(gaierr)); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2782 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2783 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2784 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 2785 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 2786 | continue; |
Damien Miller | 2372ace | 2003-05-14 13:42:23 +1000 | [diff] [blame] | 2787 | sock = socket(ai->ai_family, ai->ai_socktype, |
| 2788 | ai->ai_protocol); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2789 | if (sock < 0) { |
Damien Miller | 89d9796 | 2000-10-14 12:37:19 +1100 | [diff] [blame] | 2790 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
Damien Miller | e219273 | 2000-01-17 13:22:55 +1100 | [diff] [blame] | 2791 | error("socket: %.100s", strerror(errno)); |
Damien Miller | 3e4dffb | 2004-06-15 10:27:15 +1000 | [diff] [blame] | 2792 | freeaddrinfo(aitop); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2793 | return -1; |
Damien Miller | e219273 | 2000-01-17 13:22:55 +1100 | [diff] [blame] | 2794 | } else { |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 2795 | debug("x11_create_display_inet: Socket family %d not supported", |
| 2796 | ai->ai_family); |
Damien Miller | e219273 | 2000-01-17 13:22:55 +1100 | [diff] [blame] | 2797 | continue; |
| 2798 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2799 | } |
Kevin Steves | df75dd2 | 2002-06-04 20:52:19 +0000 | [diff] [blame] | 2800 | #ifdef IPV6_V6ONLY |
| 2801 | if (ai->ai_family == AF_INET6) { |
| 2802 | int on = 1; |
| 2803 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) |
| 2804 | error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno)); |
| 2805 | } |
| 2806 | #endif |
Damien Miller | 5e7fd07 | 2005-11-05 14:53:39 +1100 | [diff] [blame] | 2807 | channel_set_reuseaddr(sock); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2808 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 2809 | debug2("bind port %d: %.100s", port, strerror(errno)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2810 | close(sock); |
Damien Miller | 3c7eeb2 | 2000-03-03 22:35:33 +1100 | [diff] [blame] | 2811 | |
| 2812 | if (ai->ai_next) |
| 2813 | continue; |
| 2814 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2815 | for (n = 0; n < num_socks; n++) { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2816 | close(socks[n]); |
| 2817 | } |
| 2818 | num_socks = 0; |
| 2819 | break; |
| 2820 | } |
| 2821 | socks[num_socks++] = sock; |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 2822 | #ifndef DONT_TRY_OTHER_AF |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2823 | if (num_socks == NUM_SOCKS) |
| 2824 | break; |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 2825 | #else |
Kevin Steves | df75dd2 | 2002-06-04 20:52:19 +0000 | [diff] [blame] | 2826 | if (x11_use_localhost) { |
| 2827 | if (num_socks == NUM_SOCKS) |
| 2828 | break; |
| 2829 | } else { |
| 2830 | break; |
| 2831 | } |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 2832 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2833 | } |
Ben Lindstrom | 87b147f | 2001-01-25 00:41:12 +0000 | [diff] [blame] | 2834 | freeaddrinfo(aitop); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2835 | if (num_socks > 0) |
| 2836 | break; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2837 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2838 | if (display_number >= MAX_DISPLAYS) { |
| 2839 | error("Failed to allocate internet-domain X11 display socket."); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2840 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2841 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2842 | /* Start listening for connections on the socket. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2843 | for (n = 0; n < num_socks; n++) { |
| 2844 | sock = socks[n]; |
Darren Tucker | 3175eb9 | 2003-12-09 19:15:11 +1100 | [diff] [blame] | 2845 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2846 | error("listen: %.100s", strerror(errno)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2847 | close(sock); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2848 | return -1; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2849 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2850 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2851 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2852 | /* Allocate a channel for each socket. */ |
Darren Tucker | d3d0fa1 | 2005-10-03 18:03:05 +1000 | [diff] [blame] | 2853 | *chanids = xmalloc(sizeof(**chanids) * (num_socks + 1)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2854 | for (n = 0; n < num_socks; n++) { |
| 2855 | sock = socks[n]; |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 2856 | nc = channel_new("x11 listener", |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2857 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
| 2858 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 2859 | 0, "X11 inet listener", 1); |
Damien Miller | 699d003 | 2002-02-08 22:07:16 +1100 | [diff] [blame] | 2860 | nc->single_connection = single_connection; |
Darren Tucker | d3d0fa1 | 2005-10-03 18:03:05 +1000 | [diff] [blame] | 2861 | (*chanids)[n] = nc->self; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2862 | } |
Darren Tucker | d3d0fa1 | 2005-10-03 18:03:05 +1000 | [diff] [blame] | 2863 | (*chanids)[n] = -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2864 | |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2865 | /* Return the display number for the DISPLAY environment variable. */ |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2866 | *display_numberp = display_number; |
| 2867 | return (0); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2868 | } |
| 2869 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2870 | static int |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 2871 | connect_local_xsocket(u_int dnr) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2872 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2873 | int sock; |
| 2874 | struct sockaddr_un addr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2875 | |
Damien Miller | 3afe375 | 2001-12-21 12:39:51 +1100 | [diff] [blame] | 2876 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
| 2877 | if (sock < 0) |
| 2878 | error("socket: %.100s", strerror(errno)); |
| 2879 | memset(&addr, 0, sizeof(addr)); |
| 2880 | addr.sun_family = AF_UNIX; |
| 2881 | snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr); |
| 2882 | if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0) |
| 2883 | return sock; |
| 2884 | close(sock); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2885 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
| 2886 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2887 | } |
| 2888 | |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2889 | int |
| 2890 | x11_connect_display(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2891 | { |
Damien Miller | 398e1cf | 2002-02-05 11:52:13 +1100 | [diff] [blame] | 2892 | int display_number, sock = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2893 | const char *display; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2894 | char buf[1024], *cp; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2895 | struct addrinfo hints, *ai, *aitop; |
| 2896 | char strport[NI_MAXSERV]; |
| 2897 | int gaierr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2898 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2899 | /* Try to open a socket for the local X server. */ |
| 2900 | display = getenv("DISPLAY"); |
| 2901 | if (!display) { |
| 2902 | error("DISPLAY not set."); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2903 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2904 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2905 | /* |
| 2906 | * Now we decode the value of the DISPLAY variable and make a |
| 2907 | * connection to the real X server. |
| 2908 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2909 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2910 | /* |
| 2911 | * Check if it is a unix domain socket. Unix domain displays are in |
| 2912 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] |
| 2913 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2914 | if (strncmp(display, "unix:", 5) == 0 || |
| 2915 | display[0] == ':') { |
| 2916 | /* Connect to the unix domain socket. */ |
| 2917 | if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) { |
| 2918 | error("Could not parse display number from DISPLAY: %.100s", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 2919 | display); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2920 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2921 | } |
| 2922 | /* Create a socket. */ |
| 2923 | sock = connect_local_xsocket(display_number); |
| 2924 | if (sock < 0) |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2925 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2926 | |
| 2927 | /* OK, we now have a connection to the display. */ |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2928 | return sock; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2929 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2930 | /* |
| 2931 | * Connect to an inet socket. The DISPLAY value is supposedly |
| 2932 | * hostname:d[.s], where hostname may also be numeric IP address. |
| 2933 | */ |
Ben Lindstrom | ccd8d07 | 2001-12-07 17:26:48 +0000 | [diff] [blame] | 2934 | strlcpy(buf, display, sizeof(buf)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2935 | cp = strchr(buf, ':'); |
| 2936 | if (!cp) { |
| 2937 | error("Could not find ':' in DISPLAY: %.100s", display); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2938 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2939 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2940 | *cp = 0; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2941 | /* buf now contains the host name. But first we parse the display number. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2942 | if (sscanf(cp + 1, "%d", &display_number) != 1) { |
| 2943 | error("Could not parse display number from DISPLAY: %.100s", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 2944 | display); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2945 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2946 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2947 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2948 | /* Look up the host address */ |
| 2949 | memset(&hints, 0, sizeof(hints)); |
| 2950 | hints.ai_family = IPv4or6; |
| 2951 | hints.ai_socktype = SOCK_STREAM; |
| 2952 | snprintf(strport, sizeof strport, "%d", 6000 + display_number); |
| 2953 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
| 2954 | error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr)); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2955 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2956 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2957 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 2958 | /* Create a socket. */ |
Damien Miller | 2372ace | 2003-05-14 13:42:23 +1000 | [diff] [blame] | 2959 | sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2960 | if (sock < 0) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 2961 | debug2("socket: %.100s", strerror(errno)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2962 | continue; |
| 2963 | } |
| 2964 | /* Connect it to the display. */ |
| 2965 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
Damien Miller | fbdeece | 2003-09-02 22:52:31 +1000 | [diff] [blame] | 2966 | debug2("connect %.100s port %d: %.100s", buf, |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2967 | 6000 + display_number, strerror(errno)); |
| 2968 | close(sock); |
| 2969 | continue; |
| 2970 | } |
| 2971 | /* Success */ |
| 2972 | break; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2973 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2974 | freeaddrinfo(aitop); |
| 2975 | if (!ai) { |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2976 | error("connect %.100s port %d: %.100s", buf, 6000 + display_number, |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2977 | strerror(errno)); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2978 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2979 | } |
Damien Miller | 398e1cf | 2002-02-05 11:52:13 +1100 | [diff] [blame] | 2980 | set_nodelay(sock); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2981 | return sock; |
| 2982 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2983 | |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2984 | /* |
| 2985 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains |
| 2986 | * the remote channel number. We should do whatever we want, and respond |
| 2987 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. |
| 2988 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2989 | |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2990 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2991 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2992 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2993 | Channel *c = NULL; |
| 2994 | int remote_id, sock = 0; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2995 | char *remote_host; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2996 | |
| 2997 | debug("Received X11 open request."); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2998 | |
| 2999 | remote_id = packet_get_int(); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 3000 | |
| 3001 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 3002 | remote_host = packet_get_string(NULL); |
| 3003 | } else { |
| 3004 | remote_host = xstrdup("unknown (remote did not supply name)"); |
| 3005 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 3006 | packet_check_eom(); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3007 | |
| 3008 | /* Obtain a connection to the real X display. */ |
| 3009 | sock = x11_connect_display(); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 3010 | if (sock != -1) { |
| 3011 | /* Allocate a channel for this connection. */ |
| 3012 | c = channel_new("connected x11 socket", |
| 3013 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, |
| 3014 | remote_host, 1); |
Damien Miller | 699d003 | 2002-02-08 22:07:16 +1100 | [diff] [blame] | 3015 | c->remote_id = remote_id; |
| 3016 | c->force_drain = 1; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 3017 | } |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 3018 | xfree(remote_host); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 3019 | if (c == NULL) { |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3020 | /* Send refusal to the remote host. */ |
| 3021 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 3022 | packet_put_int(remote_id); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3023 | } else { |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3024 | /* Send a confirmation to the remote host. */ |
| 3025 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 3026 | packet_put_int(remote_id); |
| 3027 | packet_put_int(c->self); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3028 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 3029 | packet_send(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3030 | } |
| 3031 | |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 3032 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
| 3033 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 3034 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 3035 | { |
| 3036 | int rchan = packet_get_int(); |
Ben Lindstrom | 8b2eecd | 2002-07-07 22:11:51 +0000 | [diff] [blame] | 3037 | |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 3038 | switch (type) { |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 3039 | case SSH_SMSG_AGENT_OPEN: |
| 3040 | error("Warning: ssh server tried agent forwarding."); |
| 3041 | break; |
| 3042 | case SSH_SMSG_X11_OPEN: |
| 3043 | error("Warning: ssh server tried X11 forwarding."); |
| 3044 | break; |
| 3045 | default: |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 3046 | error("deny_input_open: type %d", type); |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 3047 | break; |
| 3048 | } |
Damien Miller | 5eb137c | 2005-12-31 16:19:53 +1100 | [diff] [blame] | 3049 | error("Warning: this is probably a break-in attempt by a malicious server."); |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 3050 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 3051 | packet_put_int(rchan); |
| 3052 | packet_send(); |
| 3053 | } |
| 3054 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 3055 | /* |
| 3056 | * Requests forwarding of X11 connections, generates fake authentication |
| 3057 | * data, and enables authentication spoofing. |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 3058 | * This should be called in the client only. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 3059 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 3060 | void |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 3061 | x11_request_forwarding_with_spoofing(int client_session_id, const char *disp, |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3062 | const char *proto, const char *data) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3063 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 3064 | u_int data_len = (u_int) strlen(data) / 2; |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 3065 | u_int i, value; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3066 | char *new_data; |
| 3067 | int screen_number; |
| 3068 | const char *cp; |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 3069 | u_int32_t rnd = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3070 | |
Damien Miller | f92c079 | 2005-07-06 09:45:26 +1000 | [diff] [blame] | 3071 | if (x11_saved_display == NULL) |
| 3072 | x11_saved_display = xstrdup(disp); |
| 3073 | else if (strcmp(disp, x11_saved_display) != 0) { |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 3074 | error("x11_request_forwarding_with_spoofing: different " |
| 3075 | "$DISPLAY already forwarded"); |
| 3076 | return; |
| 3077 | } |
| 3078 | |
Damien Miller | 17e7ed0 | 2005-06-17 12:54:33 +1000 | [diff] [blame] | 3079 | cp = disp; |
| 3080 | if (disp) |
| 3081 | cp = strchr(disp, ':'); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3082 | if (cp) |
| 3083 | cp = strchr(cp, '.'); |
| 3084 | if (cp) |
| 3085 | screen_number = atoi(cp + 1); |
| 3086 | else |
| 3087 | screen_number = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3088 | |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 3089 | if (x11_saved_proto == NULL) { |
| 3090 | /* Save protocol name. */ |
| 3091 | x11_saved_proto = xstrdup(proto); |
| 3092 | /* |
Damien Miller | 46d38de | 2005-07-17 17:02:09 +1000 | [diff] [blame] | 3093 | * Extract real authentication data and generate fake data |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 3094 | * of the same length. |
| 3095 | */ |
| 3096 | x11_saved_data = xmalloc(data_len); |
| 3097 | x11_fake_data = xmalloc(data_len); |
| 3098 | for (i = 0; i < data_len; i++) { |
| 3099 | if (sscanf(data + 2 * i, "%2x", &value) != 1) |
| 3100 | fatal("x11_request_forwarding: bad " |
| 3101 | "authentication data: %.100s", data); |
| 3102 | if (i % 4 == 0) |
| 3103 | rnd = arc4random(); |
| 3104 | x11_saved_data[i] = value; |
| 3105 | x11_fake_data[i] = rnd & 0xff; |
| 3106 | rnd >>= 8; |
| 3107 | } |
| 3108 | x11_saved_data_len = data_len; |
| 3109 | x11_fake_data_len = data_len; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3110 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3111 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3112 | /* Convert the fake data into hex. */ |
Damien Miller | 1339002 | 2005-07-06 09:44:19 +1000 | [diff] [blame] | 3113 | new_data = tohex(x11_fake_data, data_len); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3114 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3115 | /* Send the request packet. */ |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 3116 | if (compat20) { |
| 3117 | channel_request_start(client_session_id, "x11-req", 0); |
| 3118 | packet_put_char(0); /* XXX bool single connection */ |
| 3119 | } else { |
| 3120 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); |
| 3121 | } |
| 3122 | packet_put_cstring(proto); |
| 3123 | packet_put_cstring(new_data); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3124 | packet_put_int(screen_number); |
| 3125 | packet_send(); |
| 3126 | packet_write_wait(); |
| 3127 | xfree(new_data); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3128 | } |
| 3129 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 3130 | |
| 3131 | /* -- agent forwarding */ |
| 3132 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3133 | /* Sends a message to the server to request authentication fd forwarding. */ |
| 3134 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 3135 | void |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 3136 | auth_request_forwarding(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3137 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3138 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
| 3139 | packet_send(); |
| 3140 | packet_write_wait(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3141 | } |