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" |
Ben Lindstrom | daa2179 | 2002-06-25 23:15:30 +0000 | [diff] [blame] | 42 | RCSID("$OpenBSD: channels.c,v 1.177 2002/06/23 21:34:07 markus Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 43 | |
| 44 | #include "ssh.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 45 | #include "ssh1.h" |
| 46 | #include "ssh2.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 47 | #include "packet.h" |
| 48 | #include "xmalloc.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 49 | #include "log.h" |
| 50 | #include "misc.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 51 | #include "channels.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 52 | #include "compat.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 53 | #include "canohost.h" |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 54 | #include "key.h" |
| 55 | #include "authfd.h" |
Damien Miller | 3afe375 | 2001-12-21 12:39:51 +1100 | [diff] [blame] | 56 | #include "pathnames.h" |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 57 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 58 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 59 | /* -- channel core */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 60 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 61 | /* |
| 62 | * Pointer to an array containing all allocated channels. The array is |
| 63 | * dynamically extended as needed. |
| 64 | */ |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 65 | static Channel **channels = NULL; |
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 | * 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] | 69 | * initialized (at least the type field); unused slots set to NULL |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 70 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 71 | static int channels_alloc = 0; |
| 72 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 73 | /* |
| 74 | * Maximum file descriptor value used in any of the channels. This is |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 75 | * updated in channel_new. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 76 | */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 77 | static int channel_max_fd = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 78 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 79 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 80 | /* -- tcp forwarding */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 81 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 82 | /* |
| 83 | * Data structure for storing which hosts are permitted for forward requests. |
| 84 | * The local sides of any remote forwards are stored in this array to prevent |
| 85 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local |
| 86 | * network (which might be behind a firewall). |
| 87 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 88 | typedef struct { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 89 | char *host_to_connect; /* Connect to 'host'. */ |
| 90 | u_short port_to_connect; /* Connect to 'port'. */ |
| 91 | u_short listen_port; /* Remote side should listen port number. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 92 | } ForwardPermission; |
| 93 | |
| 94 | /* List of all permitted host/port pairs to connect. */ |
| 95 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 96 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 97 | /* Number of permitted host/port pairs in the array. */ |
| 98 | static int num_permitted_opens = 0; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 99 | /* |
| 100 | * If this is true, all opens are permitted. This is the case on the server |
| 101 | * on which we have to trust the client anyway, and the user could do |
| 102 | * anything after logging in anyway. |
| 103 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 104 | static int all_opens_permitted = 0; |
| 105 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 106 | |
| 107 | /* -- X11 forwarding */ |
| 108 | |
| 109 | /* Maximum number of fake X11 displays to try. */ |
| 110 | #define MAX_DISPLAYS 1000 |
| 111 | |
| 112 | /* Saved X11 authentication protocol name. */ |
| 113 | static char *x11_saved_proto = NULL; |
| 114 | |
| 115 | /* Saved X11 authentication data. This is the real data. */ |
| 116 | static char *x11_saved_data = NULL; |
| 117 | static u_int x11_saved_data_len = 0; |
| 118 | |
| 119 | /* |
| 120 | * Fake X11 authentication data. This is what the server will be sending us; |
| 121 | * we should replace any occurrences of this by the real data. |
| 122 | */ |
| 123 | static char *x11_fake_data = NULL; |
| 124 | static u_int x11_fake_data_len; |
| 125 | |
| 126 | |
| 127 | /* -- agent forwarding */ |
| 128 | |
| 129 | #define NUM_SOCKS 10 |
| 130 | |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 131 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
Ben Lindstrom | 908afed | 2001-10-03 17:34:59 +0000 | [diff] [blame] | 132 | static int IPv4or6 = AF_UNSPEC; |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 133 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 134 | /* helper */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 135 | static void port_open_helper(Channel *c, char *rtype); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 136 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 137 | /* -- channel core */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 138 | |
| 139 | Channel * |
| 140 | channel_lookup(int id) |
| 141 | { |
| 142 | Channel *c; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 143 | |
Ben Lindstrom | 7954887 | 2002-03-05 01:57:44 +0000 | [diff] [blame] | 144 | if (id < 0 || id >= channels_alloc) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 145 | log("channel_lookup: %d: bad id", id); |
| 146 | return NULL; |
| 147 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 148 | c = channels[id]; |
| 149 | if (c == NULL) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 150 | log("channel_lookup: %d: bad id: channel free", id); |
| 151 | return NULL; |
| 152 | } |
| 153 | return c; |
| 154 | } |
| 155 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 156 | /* |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 157 | * Register filedescriptors for a channel, used when allocating a channel or |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 158 | * when the channel consumer/producer is ready, e.g. shell exec'd |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 159 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 160 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 161 | static void |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 162 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
| 163 | int extusage, int nonblock) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 164 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 165 | /* Update the maximum file descriptor value. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 166 | channel_max_fd = MAX(channel_max_fd, rfd); |
| 167 | channel_max_fd = MAX(channel_max_fd, wfd); |
| 168 | channel_max_fd = MAX(channel_max_fd, efd); |
| 169 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 170 | /* XXX set close-on-exec -markus */ |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 171 | |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 172 | c->rfd = rfd; |
| 173 | c->wfd = wfd; |
| 174 | c->sock = (rfd == wfd) ? rfd : -1; |
| 175 | c->efd = efd; |
| 176 | c->extended_usage = extusage; |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 177 | |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 178 | /* XXX ugly hack: nonblock is only set by the server */ |
| 179 | if (nonblock && isatty(c->rfd)) { |
Ben Lindstrom | cc74df7 | 2001-03-05 06:20:14 +0000 | [diff] [blame] | 180 | debug("channel %d: rfd %d isatty", c->self, c->rfd); |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 181 | c->isatty = 1; |
| 182 | if (!isatty(c->wfd)) { |
Ben Lindstrom | cc74df7 | 2001-03-05 06:20:14 +0000 | [diff] [blame] | 183 | error("channel %d: wfd %d is not a tty?", |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 184 | c->self, c->wfd); |
| 185 | } |
| 186 | } else { |
| 187 | c->isatty = 0; |
| 188 | } |
| 189 | |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 190 | /* enable nonblocking mode */ |
| 191 | if (nonblock) { |
| 192 | if (rfd != -1) |
| 193 | set_nonblock(rfd); |
| 194 | if (wfd != -1) |
| 195 | set_nonblock(wfd); |
| 196 | if (efd != -1) |
| 197 | set_nonblock(efd); |
| 198 | } |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 199 | } |
| 200 | |
| 201 | /* |
| 202 | * Allocate a new channel object and set its type and socket. This will cause |
| 203 | * remote_name to be freed. |
| 204 | */ |
| 205 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 206 | Channel * |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 207 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 208 | int window, int maxpack, int extusage, char *remote_name, int nonblock) |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 209 | { |
| 210 | int i, found; |
| 211 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 212 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 213 | /* Do initial allocation if this is the first call. */ |
| 214 | if (channels_alloc == 0) { |
| 215 | channels_alloc = 10; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 216 | channels = xmalloc(channels_alloc * sizeof(Channel *)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 217 | for (i = 0; i < channels_alloc; i++) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 218 | channels[i] = NULL; |
Ben Lindstrom | 601e436 | 2001-06-21 03:19:23 +0000 | [diff] [blame] | 219 | fatal_add_cleanup((void (*) (void *)) channel_free_all, NULL); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 220 | } |
| 221 | /* Try to find a free slot where to put the new channel. */ |
| 222 | for (found = -1, i = 0; i < channels_alloc; i++) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 223 | if (channels[i] == NULL) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 224 | /* Found a free slot. */ |
| 225 | found = i; |
| 226 | break; |
| 227 | } |
| 228 | if (found == -1) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 229 | /* 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] | 230 | found = channels_alloc; |
| 231 | channels_alloc += 10; |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 232 | debug2("channel: expanding %d", channels_alloc); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 233 | channels = xrealloc(channels, channels_alloc * sizeof(Channel *)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 234 | for (i = found; i < channels_alloc; i++) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 235 | channels[i] = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 236 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 237 | /* Initialize and return new channel. */ |
| 238 | c = channels[found] = xmalloc(sizeof(Channel)); |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 239 | memset(c, 0, sizeof(Channel)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 240 | buffer_init(&c->input); |
| 241 | buffer_init(&c->output); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 242 | buffer_init(&c->extended); |
Damien Miller | 5144df9 | 2002-01-22 23:28:45 +1100 | [diff] [blame] | 243 | c->ostate = CHAN_OUTPUT_OPEN; |
| 244 | c->istate = CHAN_INPUT_OPEN; |
| 245 | c->flags = 0; |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 246 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 247 | c->self = found; |
| 248 | c->type = type; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 249 | c->ctype = ctype; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 250 | c->local_window = window; |
| 251 | c->local_window_max = window; |
| 252 | c->local_consumed = 0; |
| 253 | c->local_maxpacket = maxpack; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 254 | c->remote_id = -1; |
| 255 | c->remote_name = remote_name; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 256 | c->remote_window = 0; |
| 257 | c->remote_maxpacket = 0; |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 258 | c->force_drain = 0; |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 259 | c->single_connection = 0; |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 260 | c->detach_user = NULL; |
Damien Miller | 67f0bc0 | 2002-02-05 12:23:08 +1100 | [diff] [blame] | 261 | c->confirm = NULL; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 262 | c->input_filter = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 263 | debug("channel %d: new [%s]", found, remote_name); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 264 | return c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 265 | } |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 266 | |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 267 | static int |
| 268 | channel_find_maxfd(void) |
| 269 | { |
| 270 | int i, max = 0; |
| 271 | Channel *c; |
| 272 | |
| 273 | for (i = 0; i < channels_alloc; i++) { |
| 274 | c = channels[i]; |
| 275 | if (c != NULL) { |
| 276 | max = MAX(max, c->rfd); |
| 277 | max = MAX(max, c->wfd); |
| 278 | max = MAX(max, c->efd); |
| 279 | } |
| 280 | } |
| 281 | return max; |
| 282 | } |
| 283 | |
| 284 | int |
| 285 | channel_close_fd(int *fdp) |
| 286 | { |
| 287 | int ret = 0, fd = *fdp; |
| 288 | |
| 289 | if (fd != -1) { |
| 290 | ret = close(fd); |
| 291 | *fdp = -1; |
| 292 | if (fd == channel_max_fd) |
| 293 | channel_max_fd = channel_find_maxfd(); |
| 294 | } |
| 295 | return ret; |
| 296 | } |
| 297 | |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 298 | /* Close all channel fd/socket. */ |
| 299 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 300 | static void |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 301 | channel_close_fds(Channel *c) |
| 302 | { |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 303 | debug3("channel_close_fds: channel %d: r %d w %d e %d", |
| 304 | c->self, c->rfd, c->wfd, c->efd); |
| 305 | |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 306 | channel_close_fd(&c->sock); |
| 307 | channel_close_fd(&c->rfd); |
| 308 | channel_close_fd(&c->wfd); |
| 309 | channel_close_fd(&c->efd); |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 310 | } |
| 311 | |
| 312 | /* Free the channel and close its fd/socket. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 313 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 314 | void |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 315 | channel_free(Channel *c) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 316 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 317 | char *s; |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 318 | int i, n; |
| 319 | |
| 320 | for (n = 0, i = 0; i < channels_alloc; i++) |
| 321 | if (channels[i]) |
| 322 | n++; |
Ben Lindstrom | 4c24755 | 2001-06-05 20:56:47 +0000 | [diff] [blame] | 323 | debug("channel_free: channel %d: %s, nchannels %d", c->self, |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 324 | c->remote_name ? c->remote_name : "???", n); |
Ben Lindstrom | 6c3ae2b | 2000-12-30 03:25:14 +0000 | [diff] [blame] | 325 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 326 | s = channel_open_message(); |
Ben Lindstrom | 4c24755 | 2001-06-05 20:56:47 +0000 | [diff] [blame] | 327 | debug3("channel_free: status: %s", s); |
Ben Lindstrom | 6c3ae2b | 2000-12-30 03:25:14 +0000 | [diff] [blame] | 328 | xfree(s); |
| 329 | |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 330 | if (c->sock != -1) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 331 | shutdown(c->sock, SHUT_RDWR); |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 332 | channel_close_fds(c); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 333 | buffer_free(&c->input); |
| 334 | buffer_free(&c->output); |
| 335 | buffer_free(&c->extended); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 336 | if (c->remote_name) { |
| 337 | xfree(c->remote_name); |
| 338 | c->remote_name = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 339 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 340 | channels[c->self] = NULL; |
| 341 | xfree(c); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 342 | } |
| 343 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 344 | void |
Ben Lindstrom | 601e436 | 2001-06-21 03:19:23 +0000 | [diff] [blame] | 345 | channel_free_all(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 346 | { |
| 347 | int i; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 348 | |
Ben Lindstrom | 601e436 | 2001-06-21 03:19:23 +0000 | [diff] [blame] | 349 | for (i = 0; i < channels_alloc; i++) |
| 350 | if (channels[i] != NULL) |
| 351 | channel_free(channels[i]); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 352 | } |
| 353 | |
| 354 | /* |
| 355 | * Closes the sockets/fds of all channels. This is used to close extra file |
| 356 | * descriptors after a fork. |
| 357 | */ |
| 358 | |
| 359 | void |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 360 | channel_close_all(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 361 | { |
| 362 | int i; |
| 363 | |
| 364 | for (i = 0; i < channels_alloc; i++) |
| 365 | if (channels[i] != NULL) |
| 366 | channel_close_fds(channels[i]); |
| 367 | } |
| 368 | |
| 369 | /* |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 370 | * Stop listening to channels. |
| 371 | */ |
| 372 | |
| 373 | void |
| 374 | channel_stop_listening(void) |
| 375 | { |
| 376 | int i; |
| 377 | Channel *c; |
| 378 | |
| 379 | for (i = 0; i < channels_alloc; i++) { |
| 380 | c = channels[i]; |
| 381 | if (c != NULL) { |
| 382 | switch (c->type) { |
| 383 | case SSH_CHANNEL_AUTH_SOCKET: |
| 384 | case SSH_CHANNEL_PORT_LISTENER: |
| 385 | case SSH_CHANNEL_RPORT_LISTENER: |
| 386 | case SSH_CHANNEL_X11_LISTENER: |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 387 | channel_close_fd(&c->sock); |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 388 | channel_free(c); |
| 389 | break; |
| 390 | } |
| 391 | } |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | /* |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 396 | * Returns true if no channel has too much buffered data, and false if one or |
| 397 | * more channel is overfull. |
| 398 | */ |
| 399 | |
| 400 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 401 | channel_not_very_much_buffered_data(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 402 | { |
| 403 | u_int i; |
| 404 | Channel *c; |
| 405 | |
| 406 | for (i = 0; i < channels_alloc; i++) { |
| 407 | c = channels[i]; |
| 408 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 409 | #if 0 |
| 410 | if (!compat20 && |
| 411 | buffer_len(&c->input) > packet_get_maxsize()) { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 412 | debug("channel %d: big input buffer %d", |
| 413 | c->self, buffer_len(&c->input)); |
| 414 | return 0; |
| 415 | } |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 416 | #endif |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 417 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 418 | debug("channel %d: big output buffer %d > %d", |
| 419 | c->self, buffer_len(&c->output), |
| 420 | packet_get_maxsize()); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 421 | return 0; |
| 422 | } |
| 423 | } |
| 424 | } |
| 425 | return 1; |
| 426 | } |
| 427 | |
| 428 | /* Returns true if any channel is still open. */ |
| 429 | |
| 430 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 431 | channel_still_open(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 432 | { |
| 433 | int i; |
| 434 | Channel *c; |
| 435 | |
| 436 | for (i = 0; i < channels_alloc; i++) { |
| 437 | c = channels[i]; |
| 438 | if (c == NULL) |
| 439 | continue; |
| 440 | switch (c->type) { |
| 441 | case SSH_CHANNEL_X11_LISTENER: |
| 442 | case SSH_CHANNEL_PORT_LISTENER: |
| 443 | case SSH_CHANNEL_RPORT_LISTENER: |
| 444 | case SSH_CHANNEL_CLOSED: |
| 445 | case SSH_CHANNEL_AUTH_SOCKET: |
| 446 | case SSH_CHANNEL_DYNAMIC: |
| 447 | case SSH_CHANNEL_CONNECTING: |
| 448 | case SSH_CHANNEL_ZOMBIE: |
| 449 | continue; |
| 450 | case SSH_CHANNEL_LARVAL: |
| 451 | if (!compat20) |
| 452 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); |
| 453 | continue; |
| 454 | case SSH_CHANNEL_OPENING: |
| 455 | case SSH_CHANNEL_OPEN: |
| 456 | case SSH_CHANNEL_X11_OPEN: |
| 457 | return 1; |
| 458 | case SSH_CHANNEL_INPUT_DRAINING: |
| 459 | case SSH_CHANNEL_OUTPUT_DRAINING: |
| 460 | if (!compat13) |
| 461 | fatal("cannot happen: OUT_DRAIN"); |
| 462 | return 1; |
| 463 | default: |
| 464 | fatal("channel_still_open: bad channel type %d", c->type); |
| 465 | /* NOTREACHED */ |
| 466 | } |
| 467 | } |
| 468 | return 0; |
| 469 | } |
| 470 | |
| 471 | /* Returns the id of an open channel suitable for keepaliving */ |
| 472 | |
| 473 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 474 | channel_find_open(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 475 | { |
| 476 | int i; |
| 477 | Channel *c; |
| 478 | |
| 479 | for (i = 0; i < channels_alloc; i++) { |
| 480 | c = channels[i]; |
| 481 | if (c == NULL) |
| 482 | continue; |
| 483 | switch (c->type) { |
| 484 | case SSH_CHANNEL_CLOSED: |
| 485 | case SSH_CHANNEL_DYNAMIC: |
| 486 | case SSH_CHANNEL_X11_LISTENER: |
| 487 | case SSH_CHANNEL_PORT_LISTENER: |
| 488 | case SSH_CHANNEL_RPORT_LISTENER: |
| 489 | case SSH_CHANNEL_OPENING: |
| 490 | case SSH_CHANNEL_CONNECTING: |
| 491 | case SSH_CHANNEL_ZOMBIE: |
| 492 | continue; |
| 493 | case SSH_CHANNEL_LARVAL: |
| 494 | case SSH_CHANNEL_AUTH_SOCKET: |
| 495 | case SSH_CHANNEL_OPEN: |
| 496 | case SSH_CHANNEL_X11_OPEN: |
| 497 | return i; |
| 498 | case SSH_CHANNEL_INPUT_DRAINING: |
| 499 | case SSH_CHANNEL_OUTPUT_DRAINING: |
| 500 | if (!compat13) |
| 501 | fatal("cannot happen: OUT_DRAIN"); |
| 502 | return i; |
| 503 | default: |
| 504 | fatal("channel_find_open: bad channel type %d", c->type); |
| 505 | /* NOTREACHED */ |
| 506 | } |
| 507 | } |
| 508 | return -1; |
| 509 | } |
| 510 | |
| 511 | |
| 512 | /* |
| 513 | * Returns a message describing the currently open forwarded connections, |
| 514 | * suitable for sending to the client. The message contains crlf pairs for |
| 515 | * newlines. |
| 516 | */ |
| 517 | |
| 518 | char * |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 519 | channel_open_message(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 520 | { |
| 521 | Buffer buffer; |
| 522 | Channel *c; |
| 523 | char buf[1024], *cp; |
| 524 | int i; |
| 525 | |
| 526 | buffer_init(&buffer); |
| 527 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); |
| 528 | buffer_append(&buffer, buf, strlen(buf)); |
| 529 | for (i = 0; i < channels_alloc; i++) { |
| 530 | c = channels[i]; |
| 531 | if (c == NULL) |
| 532 | continue; |
| 533 | switch (c->type) { |
| 534 | case SSH_CHANNEL_X11_LISTENER: |
| 535 | case SSH_CHANNEL_PORT_LISTENER: |
| 536 | case SSH_CHANNEL_RPORT_LISTENER: |
| 537 | case SSH_CHANNEL_CLOSED: |
| 538 | case SSH_CHANNEL_AUTH_SOCKET: |
| 539 | case SSH_CHANNEL_ZOMBIE: |
| 540 | continue; |
| 541 | case SSH_CHANNEL_LARVAL: |
| 542 | case SSH_CHANNEL_OPENING: |
| 543 | case SSH_CHANNEL_CONNECTING: |
| 544 | case SSH_CHANNEL_DYNAMIC: |
| 545 | case SSH_CHANNEL_OPEN: |
| 546 | case SSH_CHANNEL_X11_OPEN: |
| 547 | case SSH_CHANNEL_INPUT_DRAINING: |
| 548 | case SSH_CHANNEL_OUTPUT_DRAINING: |
| 549 | snprintf(buf, sizeof buf, " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n", |
| 550 | c->self, c->remote_name, |
| 551 | c->type, c->remote_id, |
| 552 | c->istate, buffer_len(&c->input), |
| 553 | c->ostate, buffer_len(&c->output), |
| 554 | c->rfd, c->wfd); |
| 555 | buffer_append(&buffer, buf, strlen(buf)); |
| 556 | continue; |
| 557 | default: |
| 558 | fatal("channel_open_message: bad channel type %d", c->type); |
| 559 | /* NOTREACHED */ |
| 560 | } |
| 561 | } |
| 562 | buffer_append(&buffer, "\0", 1); |
| 563 | cp = xstrdup(buffer_ptr(&buffer)); |
| 564 | buffer_free(&buffer); |
| 565 | return cp; |
| 566 | } |
| 567 | |
| 568 | void |
| 569 | channel_send_open(int id) |
| 570 | { |
| 571 | Channel *c = channel_lookup(id); |
| 572 | if (c == NULL) { |
| 573 | log("channel_send_open: %d: bad id", id); |
| 574 | return; |
| 575 | } |
| 576 | debug("send channel open %d", id); |
| 577 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 578 | packet_put_cstring(c->ctype); |
| 579 | packet_put_int(c->self); |
| 580 | packet_put_int(c->local_window); |
| 581 | packet_put_int(c->local_maxpacket); |
| 582 | packet_send(); |
| 583 | } |
| 584 | |
| 585 | void |
Damien Miller | a500cd6 | 2002-02-08 22:04:26 +1100 | [diff] [blame] | 586 | channel_request_start(int local_id, char *service, int wantconfirm) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 587 | { |
Damien Miller | a500cd6 | 2002-02-08 22:04:26 +1100 | [diff] [blame] | 588 | Channel *c = channel_lookup(local_id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 589 | if (c == NULL) { |
Damien Miller | a500cd6 | 2002-02-08 22:04:26 +1100 | [diff] [blame] | 590 | log("channel_request_start: %d: unknown channel id", local_id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 591 | return; |
| 592 | } |
Damien Miller | a500cd6 | 2002-02-08 22:04:26 +1100 | [diff] [blame] | 593 | debug("channel request %d: %s", local_id, service) ; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 594 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
| 595 | packet_put_int(c->remote_id); |
| 596 | packet_put_cstring(service); |
| 597 | packet_put_char(wantconfirm); |
| 598 | } |
| 599 | void |
Damien Miller | 67f0bc0 | 2002-02-05 12:23:08 +1100 | [diff] [blame] | 600 | channel_register_confirm(int id, channel_callback_fn *fn) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 601 | { |
| 602 | Channel *c = channel_lookup(id); |
| 603 | if (c == NULL) { |
Damien Miller | 67f0bc0 | 2002-02-05 12:23:08 +1100 | [diff] [blame] | 604 | log("channel_register_comfirm: %d: bad id", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 605 | return; |
| 606 | } |
Damien Miller | 67f0bc0 | 2002-02-05 12:23:08 +1100 | [diff] [blame] | 607 | c->confirm = fn; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 608 | } |
| 609 | void |
| 610 | channel_register_cleanup(int id, channel_callback_fn *fn) |
| 611 | { |
| 612 | Channel *c = channel_lookup(id); |
| 613 | if (c == NULL) { |
| 614 | log("channel_register_cleanup: %d: bad id", id); |
| 615 | return; |
| 616 | } |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 617 | c->detach_user = fn; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 618 | } |
| 619 | void |
| 620 | channel_cancel_cleanup(int id) |
| 621 | { |
| 622 | Channel *c = channel_lookup(id); |
| 623 | if (c == NULL) { |
| 624 | log("channel_cancel_cleanup: %d: bad id", id); |
| 625 | return; |
| 626 | } |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 627 | c->detach_user = NULL; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 628 | } |
| 629 | void |
| 630 | channel_register_filter(int id, channel_filter_fn *fn) |
| 631 | { |
| 632 | Channel *c = channel_lookup(id); |
| 633 | if (c == NULL) { |
| 634 | log("channel_register_filter: %d: bad id", id); |
| 635 | return; |
| 636 | } |
| 637 | c->input_filter = fn; |
| 638 | } |
| 639 | |
| 640 | void |
| 641 | channel_set_fds(int id, int rfd, int wfd, int efd, |
Damien Miller | 2aa0c19 | 2002-02-19 15:20:08 +1100 | [diff] [blame] | 642 | int extusage, int nonblock, u_int window_max) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 643 | { |
| 644 | Channel *c = channel_lookup(id); |
| 645 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
| 646 | fatal("channel_activate for non-larval channel %d.", id); |
| 647 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
| 648 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | 2aa0c19 | 2002-02-19 15:20:08 +1100 | [diff] [blame] | 649 | c->local_window = c->local_window_max = window_max; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 650 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
| 651 | packet_put_int(c->remote_id); |
| 652 | packet_put_int(c->local_window); |
| 653 | packet_send(); |
| 654 | } |
| 655 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 656 | /* |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 657 | * 'channel_pre*' are called just before select() to add any bits relevant to |
| 658 | * channels in the select bitmasks. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 659 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 660 | /* |
| 661 | * 'channel_post*': perform any appropriate operations for channels which |
| 662 | * have events pending. |
| 663 | */ |
| 664 | typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset); |
| 665 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
| 666 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; |
| 667 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 668 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 669 | channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 670 | { |
| 671 | FD_SET(c->sock, readset); |
| 672 | } |
| 673 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 674 | static void |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 675 | channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset) |
| 676 | { |
| 677 | debug3("channel %d: waiting for connection", c->self); |
| 678 | FD_SET(c->sock, writeset); |
| 679 | } |
| 680 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 681 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 682 | channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset) |
| 683 | { |
| 684 | if (buffer_len(&c->input) < packet_get_maxsize()) |
| 685 | FD_SET(c->sock, readset); |
| 686 | if (buffer_len(&c->output) > 0) |
| 687 | FD_SET(c->sock, writeset); |
| 688 | } |
| 689 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 690 | static void |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 691 | channel_pre_open(Channel *c, fd_set * readset, fd_set * writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 692 | { |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 693 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 694 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 695 | if (c->istate == CHAN_INPUT_OPEN && |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 696 | limit > 0 && |
| 697 | buffer_len(&c->input) < limit) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 698 | FD_SET(c->rfd, readset); |
| 699 | if (c->ostate == CHAN_OUTPUT_OPEN || |
| 700 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { |
| 701 | if (buffer_len(&c->output) > 0) { |
| 702 | FD_SET(c->wfd, writeset); |
| 703 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 704 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
Ben Lindstrom | 5a6abda | 2002-06-09 19:41:48 +0000 | [diff] [blame] | 705 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
| 706 | c->self, c->efd, buffer_len(&c->extended)); |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 707 | else |
| 708 | chan_obuf_empty(c); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 709 | } |
| 710 | } |
| 711 | /** XXX check close conditions, too */ |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 712 | if (compat20 && c->efd != -1) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 713 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
| 714 | buffer_len(&c->extended) > 0) |
| 715 | FD_SET(c->efd, writeset); |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 716 | else if (!(c->flags & CHAN_EOF_SENT) && |
| 717 | c->extended_usage == CHAN_EXTENDED_READ && |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 718 | buffer_len(&c->extended) < c->remote_window) |
| 719 | FD_SET(c->efd, readset); |
| 720 | } |
| 721 | } |
| 722 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 723 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 724 | channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset) |
| 725 | { |
| 726 | if (buffer_len(&c->input) == 0) { |
| 727 | packet_start(SSH_MSG_CHANNEL_CLOSE); |
| 728 | packet_put_int(c->remote_id); |
| 729 | packet_send(); |
| 730 | c->type = SSH_CHANNEL_CLOSED; |
Ben Lindstrom | c486d88 | 2001-04-11 16:08:34 +0000 | [diff] [blame] | 731 | debug("channel %d: closing after input drain.", c->self); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 732 | } |
| 733 | } |
| 734 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 735 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 736 | channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset) |
| 737 | { |
| 738 | if (buffer_len(&c->output) == 0) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 739 | chan_mark_dead(c); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 740 | else |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 741 | FD_SET(c->sock, writeset); |
| 742 | } |
| 743 | |
| 744 | /* |
| 745 | * This is a special state for X11 authentication spoofing. An opened X11 |
| 746 | * connection (when authentication spoofing is being done) remains in this |
| 747 | * state until the first packet has been completely read. The authentication |
| 748 | * data in that packet is then substituted by the real data if it matches the |
| 749 | * fake data, and the channel is put into normal mode. |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 750 | * XXX All this happens at the client side. |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 751 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 752 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 753 | static int |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 754 | x11_open_helper(Buffer *b) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 755 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 756 | u_char *ucp; |
| 757 | u_int proto_len, data_len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 758 | |
| 759 | /* Check if the fixed size part of the packet is in buffer. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 760 | if (buffer_len(b) < 12) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 761 | return 0; |
| 762 | |
| 763 | /* Parse the lengths of variable-length fields. */ |
Damien Miller | 708d21c | 2002-01-22 23:18:15 +1100 | [diff] [blame] | 764 | ucp = buffer_ptr(b); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 765 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
| 766 | proto_len = 256 * ucp[6] + ucp[7]; |
| 767 | data_len = 256 * ucp[8] + ucp[9]; |
| 768 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ |
| 769 | proto_len = ucp[6] + 256 * ucp[7]; |
| 770 | data_len = ucp[8] + 256 * ucp[9]; |
| 771 | } else { |
| 772 | debug("Initial X11 packet contains bad byte order byte: 0x%x", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 773 | ucp[0]); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 774 | return -1; |
| 775 | } |
| 776 | |
| 777 | /* Check if the whole packet is in buffer. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 778 | if (buffer_len(b) < |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 779 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
| 780 | return 0; |
| 781 | |
| 782 | /* Check if authentication protocol matches. */ |
| 783 | if (proto_len != strlen(x11_saved_proto) || |
| 784 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { |
| 785 | debug("X11 connection uses different authentication protocol."); |
| 786 | return -1; |
| 787 | } |
| 788 | /* Check if authentication data matches our fake data. */ |
| 789 | if (data_len != x11_fake_data_len || |
| 790 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), |
| 791 | x11_fake_data, x11_fake_data_len) != 0) { |
| 792 | debug("X11 auth data does not match fake data."); |
| 793 | return -1; |
| 794 | } |
| 795 | /* Check fake data length */ |
| 796 | if (x11_fake_data_len != x11_saved_data_len) { |
| 797 | error("X11 fake_data_len %d != saved_data_len %d", |
| 798 | x11_fake_data_len, x11_saved_data_len); |
| 799 | return -1; |
| 800 | } |
| 801 | /* |
| 802 | * Received authentication protocol and data match |
| 803 | * our fake data. Substitute the fake data with real |
| 804 | * data. |
| 805 | */ |
| 806 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), |
| 807 | x11_saved_data, x11_saved_data_len); |
| 808 | return 1; |
| 809 | } |
| 810 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 811 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 812 | channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset) |
| 813 | { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 814 | int ret = x11_open_helper(&c->output); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 815 | if (ret == 1) { |
| 816 | /* Start normal processing for the channel. */ |
| 817 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 818 | channel_pre_open_13(c, readset, writeset); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 819 | } else if (ret == -1) { |
| 820 | /* |
| 821 | * We have received an X11 connection that has bad |
| 822 | * authentication information. |
| 823 | */ |
Ben Lindstrom | 6df8ef4 | 2001-03-05 07:47:23 +0000 | [diff] [blame] | 824 | log("X11 connection rejected because of wrong authentication."); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 825 | buffer_clear(&c->input); |
| 826 | buffer_clear(&c->output); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 827 | channel_close_fd(&c->sock); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 828 | c->sock = -1; |
| 829 | c->type = SSH_CHANNEL_CLOSED; |
| 830 | packet_start(SSH_MSG_CHANNEL_CLOSE); |
| 831 | packet_put_int(c->remote_id); |
| 832 | packet_send(); |
| 833 | } |
| 834 | } |
| 835 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 836 | static void |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 837 | channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 838 | { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 839 | int ret = x11_open_helper(&c->output); |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 840 | |
| 841 | /* c->force_drain = 1; */ |
| 842 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 843 | if (ret == 1) { |
| 844 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 845 | channel_pre_open(c, readset, writeset); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 846 | } else if (ret == -1) { |
Damien Miller | a90fc08 | 2002-01-22 23:19:38 +1100 | [diff] [blame] | 847 | log("X11 connection rejected because of wrong authentication."); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 848 | debug("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] | 849 | chan_read_failed(c); |
| 850 | buffer_clear(&c->input); |
| 851 | chan_ibuf_empty(c); |
| 852 | buffer_clear(&c->output); |
| 853 | /* for proto v1, the peer will send an IEOF */ |
| 854 | if (compat20) |
| 855 | chan_write_failed(c); |
| 856 | else |
| 857 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 858 | debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
| 859 | } |
| 860 | } |
| 861 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 862 | /* try to decode a socks4 header */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 863 | static int |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 864 | channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset) |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 865 | { |
| 866 | u_char *p, *host; |
Ben Lindstrom | 2b261b9 | 2001-04-17 18:14:34 +0000 | [diff] [blame] | 867 | int len, have, i, found; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 868 | char username[256]; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 869 | struct { |
| 870 | u_int8_t version; |
| 871 | u_int8_t command; |
| 872 | u_int16_t dest_port; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 873 | struct in_addr dest_addr; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 874 | } s4_req, s4_rsp; |
| 875 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 876 | debug2("channel %d: decode socks4", c->self); |
Ben Lindstrom | 2b261b9 | 2001-04-17 18:14:34 +0000 | [diff] [blame] | 877 | |
| 878 | have = buffer_len(&c->input); |
| 879 | len = sizeof(s4_req); |
| 880 | if (have < len) |
| 881 | return 0; |
| 882 | p = buffer_ptr(&c->input); |
| 883 | for (found = 0, i = len; i < have; i++) { |
| 884 | if (p[i] == '\0') { |
| 885 | found = 1; |
| 886 | break; |
| 887 | } |
| 888 | if (i > 1024) { |
| 889 | /* the peer is probably sending garbage */ |
| 890 | debug("channel %d: decode socks4: too long", |
| 891 | c->self); |
| 892 | return -1; |
| 893 | } |
| 894 | } |
| 895 | if (!found) |
| 896 | return 0; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 897 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
| 898 | buffer_get(&c->input, (char *)&s4_req.command, 1); |
| 899 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 900 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
Ben Lindstrom | 2b261b9 | 2001-04-17 18:14:34 +0000 | [diff] [blame] | 901 | have = buffer_len(&c->input); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 902 | p = buffer_ptr(&c->input); |
| 903 | len = strlen(p); |
Ben Lindstrom | 6fa9d10 | 2001-04-11 23:08:17 +0000 | [diff] [blame] | 904 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 905 | if (len > have) |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 906 | fatal("channel %d: decode socks4: len %d > have %d", |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 907 | c->self, len, have); |
| 908 | strlcpy(username, p, sizeof(username)); |
| 909 | buffer_consume(&c->input, len); |
| 910 | buffer_consume(&c->input, 1); /* trailing '\0' */ |
| 911 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 912 | host = inet_ntoa(s4_req.dest_addr); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 913 | strlcpy(c->path, host, sizeof(c->path)); |
| 914 | c->host_port = ntohs(s4_req.dest_port); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 915 | |
Ben Lindstrom | 6fa9d10 | 2001-04-11 23:08:17 +0000 | [diff] [blame] | 916 | debug("channel %d: dynamic request: socks4 host %s port %u command %u", |
| 917 | c->self, host, c->host_port, s4_req.command); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 918 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 919 | if (s4_req.command != 1) { |
| 920 | debug("channel %d: cannot handle: socks4 cn %d", |
| 921 | c->self, s4_req.command); |
| 922 | return -1; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 923 | } |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 924 | s4_rsp.version = 0; /* vn: 0 for reply */ |
| 925 | s4_rsp.command = 90; /* cd: req granted */ |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 926 | s4_rsp.dest_port = 0; /* ignored */ |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 927 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 928 | buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp)); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 929 | return 1; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 930 | } |
| 931 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 932 | /* dynamic port forwarding */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 933 | static void |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 934 | channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset) |
| 935 | { |
| 936 | u_char *p; |
| 937 | int have, ret; |
| 938 | |
| 939 | have = buffer_len(&c->input); |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 940 | c->delayed = 0; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 941 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
Ben Lindstrom | c486d88 | 2001-04-11 16:08:34 +0000 | [diff] [blame] | 942 | /* buffer_dump(&c->input); */ |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 943 | /* check if the fixed size part of the packet is in buffer. */ |
| 944 | if (have < 4) { |
| 945 | /* need more */ |
| 946 | FD_SET(c->sock, readset); |
| 947 | return; |
| 948 | } |
| 949 | /* try to guess the protocol */ |
| 950 | p = buffer_ptr(&c->input); |
| 951 | switch (p[0]) { |
Ben Lindstrom | 6fa9d10 | 2001-04-11 23:08:17 +0000 | [diff] [blame] | 952 | case 0x04: |
| 953 | ret = channel_decode_socks4(c, readset, writeset); |
| 954 | break; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 955 | default: |
| 956 | ret = -1; |
| 957 | break; |
| 958 | } |
| 959 | if (ret < 0) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 960 | chan_mark_dead(c); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 961 | } else if (ret == 0) { |
| 962 | debug2("channel %d: pre_dynamic: need more", c->self); |
| 963 | /* need more */ |
| 964 | FD_SET(c->sock, readset); |
| 965 | } else { |
| 966 | /* switch to the next state */ |
| 967 | c->type = SSH_CHANNEL_OPENING; |
| 968 | port_open_helper(c, "direct-tcpip"); |
| 969 | } |
| 970 | } |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 971 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 972 | /* This is our fake X11 server socket. */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 973 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 974 | channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 975 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 976 | Channel *nc; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 977 | struct sockaddr addr; |
Damien Miller | 398e1cf | 2002-02-05 11:52:13 +1100 | [diff] [blame] | 978 | int newsock; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 979 | socklen_t addrlen; |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 980 | char buf[16384], *remote_ipaddr; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 981 | int remote_port; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 982 | |
| 983 | if (FD_ISSET(c->sock, readset)) { |
| 984 | debug("X11 connection requested."); |
| 985 | addrlen = sizeof(addr); |
| 986 | newsock = accept(c->sock, &addr, &addrlen); |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 987 | if (c->single_connection) { |
| 988 | debug("single_connection: closing X11 listener."); |
| 989 | channel_close_fd(&c->sock); |
| 990 | chan_mark_dead(c); |
| 991 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 992 | if (newsock < 0) { |
| 993 | error("accept: %.100s", strerror(errno)); |
| 994 | return; |
| 995 | } |
Damien Miller | 398e1cf | 2002-02-05 11:52:13 +1100 | [diff] [blame] | 996 | set_nodelay(newsock); |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 997 | remote_ipaddr = get_peer_ipaddr(newsock); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 998 | remote_port = get_peer_port(newsock); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 999 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1000 | remote_ipaddr, remote_port); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1001 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1002 | nc = channel_new("accepted x11 socket", |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1003 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
| 1004 | c->local_window_max, c->local_maxpacket, |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 1005 | 0, xstrdup(buf), 1); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1006 | if (compat20) { |
| 1007 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 1008 | packet_put_cstring("x11"); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1009 | packet_put_int(nc->self); |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 1010 | packet_put_int(nc->local_window_max); |
| 1011 | packet_put_int(nc->local_maxpacket); |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1012 | /* originator ipaddr and port */ |
| 1013 | packet_put_cstring(remote_ipaddr); |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 1014 | if (datafellows & SSH_BUG_X11FWD) { |
| 1015 | debug("ssh2 x11 bug compat mode"); |
| 1016 | } else { |
| 1017 | packet_put_int(remote_port); |
| 1018 | } |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1019 | packet_send(); |
| 1020 | } else { |
| 1021 | packet_start(SSH_SMSG_X11_OPEN); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1022 | packet_put_int(nc->self); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1023 | if (packet_get_protocol_flags() & |
| 1024 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) |
Ben Lindstrom | 664408d | 2001-06-09 01:42:01 +0000 | [diff] [blame] | 1025 | packet_put_cstring(buf); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1026 | packet_send(); |
| 1027 | } |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1028 | xfree(remote_ipaddr); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1029 | } |
| 1030 | } |
| 1031 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1032 | static void |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1033 | port_open_helper(Channel *c, char *rtype) |
| 1034 | { |
| 1035 | int direct; |
| 1036 | char buf[1024]; |
| 1037 | char *remote_ipaddr = get_peer_ipaddr(c->sock); |
| 1038 | u_short remote_port = get_peer_port(c->sock); |
| 1039 | |
| 1040 | direct = (strcmp(rtype, "direct-tcpip") == 0); |
| 1041 | |
| 1042 | snprintf(buf, sizeof buf, |
| 1043 | "%s: listening port %d for %.100s port %d, " |
| 1044 | "connect from %.200s port %d", |
| 1045 | rtype, c->listening_port, c->path, c->host_port, |
| 1046 | remote_ipaddr, remote_port); |
| 1047 | |
| 1048 | xfree(c->remote_name); |
| 1049 | c->remote_name = xstrdup(buf); |
| 1050 | |
| 1051 | if (compat20) { |
| 1052 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 1053 | packet_put_cstring(rtype); |
| 1054 | packet_put_int(c->self); |
| 1055 | packet_put_int(c->local_window_max); |
| 1056 | packet_put_int(c->local_maxpacket); |
| 1057 | if (direct) { |
| 1058 | /* target host, port */ |
| 1059 | packet_put_cstring(c->path); |
| 1060 | packet_put_int(c->host_port); |
| 1061 | } else { |
| 1062 | /* listen address, port */ |
| 1063 | packet_put_cstring(c->path); |
| 1064 | packet_put_int(c->listening_port); |
| 1065 | } |
| 1066 | /* originator host and port */ |
| 1067 | packet_put_cstring(remote_ipaddr); |
| 1068 | packet_put_int(remote_port); |
| 1069 | packet_send(); |
| 1070 | } else { |
| 1071 | packet_start(SSH_MSG_PORT_OPEN); |
| 1072 | packet_put_int(c->self); |
| 1073 | packet_put_cstring(c->path); |
| 1074 | packet_put_int(c->host_port); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1075 | if (packet_get_protocol_flags() & |
| 1076 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1077 | packet_put_cstring(c->remote_name); |
| 1078 | packet_send(); |
| 1079 | } |
| 1080 | xfree(remote_ipaddr); |
| 1081 | } |
| 1082 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1083 | /* |
| 1084 | * This socket is listening for connections to a forwarded TCP/IP port. |
| 1085 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1086 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1087 | channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 1088 | { |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1089 | Channel *nc; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1090 | struct sockaddr addr; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1091 | int newsock, nextstate; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1092 | socklen_t addrlen; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1093 | char *rtype; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1094 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1095 | if (FD_ISSET(c->sock, readset)) { |
| 1096 | debug("Connection to port %d forwarding " |
| 1097 | "to %.100s port %d requested.", |
| 1098 | c->listening_port, c->path, c->host_port); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1099 | |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1100 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
| 1101 | nextstate = SSH_CHANNEL_OPENING; |
| 1102 | rtype = "forwarded-tcpip"; |
| 1103 | } else { |
| 1104 | if (c->host_port == 0) { |
| 1105 | nextstate = SSH_CHANNEL_DYNAMIC; |
Damien Miller | d3c04b9 | 2001-10-10 15:04:20 +1000 | [diff] [blame] | 1106 | rtype = "dynamic-tcpip"; |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1107 | } else { |
| 1108 | nextstate = SSH_CHANNEL_OPENING; |
| 1109 | rtype = "direct-tcpip"; |
| 1110 | } |
| 1111 | } |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1112 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1113 | addrlen = sizeof(addr); |
| 1114 | newsock = accept(c->sock, &addr, &addrlen); |
| 1115 | if (newsock < 0) { |
| 1116 | error("accept: %.100s", strerror(errno)); |
| 1117 | return; |
| 1118 | } |
Ben Lindstrom | 1ebd7a5 | 2002-02-26 18:12:51 +0000 | [diff] [blame] | 1119 | set_nodelay(newsock); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1120 | nc = channel_new(rtype, |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1121 | nextstate, newsock, newsock, -1, |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1122 | c->local_window_max, c->local_maxpacket, |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1123 | 0, xstrdup(rtype), 1); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1124 | nc->listening_port = c->listening_port; |
| 1125 | nc->host_port = c->host_port; |
| 1126 | strlcpy(nc->path, c->path, sizeof(nc->path)); |
| 1127 | |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1128 | if (nextstate == SSH_CHANNEL_DYNAMIC) { |
| 1129 | /* |
| 1130 | * do not call the channel_post handler until |
| 1131 | * this flag has been reset by a pre-handler. |
| 1132 | * otherwise the FD_ISSET calls might overflow |
| 1133 | */ |
| 1134 | nc->delayed = 1; |
| 1135 | } else { |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1136 | port_open_helper(nc, rtype); |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1137 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1138 | } |
| 1139 | } |
| 1140 | |
| 1141 | /* |
| 1142 | * This is the authentication agent socket listening for connections from |
| 1143 | * clients. |
| 1144 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1145 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1146 | channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 1147 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1148 | Channel *nc; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1149 | char *name; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1150 | int newsock; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1151 | struct sockaddr addr; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1152 | socklen_t addrlen; |
| 1153 | |
| 1154 | if (FD_ISSET(c->sock, readset)) { |
| 1155 | addrlen = sizeof(addr); |
| 1156 | newsock = accept(c->sock, &addr, &addrlen); |
| 1157 | if (newsock < 0) { |
| 1158 | error("accept from auth socket: %.100s", strerror(errno)); |
| 1159 | return; |
| 1160 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1161 | name = xstrdup("accepted auth socket"); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1162 | nc = channel_new("accepted auth socket", |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1163 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
| 1164 | c->local_window_max, c->local_maxpacket, |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1165 | 0, name, 1); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1166 | if (compat20) { |
| 1167 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 1168 | packet_put_cstring("auth-agent@openssh.com"); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1169 | packet_put_int(nc->self); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1170 | packet_put_int(c->local_window_max); |
| 1171 | packet_put_int(c->local_maxpacket); |
| 1172 | } else { |
| 1173 | packet_start(SSH_SMSG_AGENT_OPEN); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1174 | packet_put_int(nc->self); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1175 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1176 | packet_send(); |
| 1177 | } |
| 1178 | } |
| 1179 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1180 | static void |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1181 | channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset) |
| 1182 | { |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1183 | int err = 0; |
Ben Lindstrom | 1118095 | 2001-07-04 05:13:35 +0000 | [diff] [blame] | 1184 | socklen_t sz = sizeof(err); |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1185 | |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1186 | if (FD_ISSET(c->sock, writeset)) { |
Ben Lindstrom | 733a235 | 2002-03-05 01:31:28 +0000 | [diff] [blame] | 1187 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1188 | err = errno; |
| 1189 | error("getsockopt SO_ERROR failed"); |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1190 | } |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1191 | if (err == 0) { |
| 1192 | debug("channel %d: connected", c->self); |
| 1193 | c->type = SSH_CHANNEL_OPEN; |
| 1194 | if (compat20) { |
| 1195 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1196 | packet_put_int(c->remote_id); |
| 1197 | packet_put_int(c->self); |
| 1198 | packet_put_int(c->local_window); |
| 1199 | packet_put_int(c->local_maxpacket); |
| 1200 | } else { |
| 1201 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1202 | packet_put_int(c->remote_id); |
| 1203 | packet_put_int(c->self); |
| 1204 | } |
| 1205 | } else { |
| 1206 | debug("channel %d: not connected: %s", |
| 1207 | c->self, strerror(err)); |
| 1208 | if (compat20) { |
| 1209 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); |
| 1210 | packet_put_int(c->remote_id); |
| 1211 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); |
| 1212 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
| 1213 | packet_put_cstring(strerror(err)); |
| 1214 | packet_put_cstring(""); |
| 1215 | } |
| 1216 | } else { |
| 1217 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 1218 | packet_put_int(c->remote_id); |
| 1219 | } |
| 1220 | chan_mark_dead(c); |
| 1221 | } |
| 1222 | packet_send(); |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1223 | } |
| 1224 | } |
| 1225 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1226 | static int |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1227 | channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset) |
| 1228 | { |
| 1229 | char buf[16*1024]; |
| 1230 | int len; |
| 1231 | |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 1232 | if (c->rfd != -1 && |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1233 | FD_ISSET(c->rfd, readset)) { |
| 1234 | len = read(c->rfd, buf, sizeof(buf)); |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 1235 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
| 1236 | return 1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1237 | if (len <= 0) { |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1238 | debug("channel %d: read<=0 rfd %d len %d", |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1239 | c->self, c->rfd, len); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1240 | if (c->type != SSH_CHANNEL_OPEN) { |
| 1241 | debug("channel %d: not open", c->self); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1242 | chan_mark_dead(c); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1243 | return -1; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1244 | } else if (compat13) { |
Damien Miller | 76765c0 | 2002-01-22 23:21:15 +1100 | [diff] [blame] | 1245 | buffer_clear(&c->output); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1246 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1247 | debug("channel %d: input draining.", c->self); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1248 | } else { |
| 1249 | chan_read_failed(c); |
| 1250 | } |
| 1251 | return -1; |
| 1252 | } |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1253 | if (c->input_filter != NULL) { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1254 | if (c->input_filter(c, buf, len) == -1) { |
Ben Lindstrom | c486d88 | 2001-04-11 16:08:34 +0000 | [diff] [blame] | 1255 | debug("channel %d: filter stops", c->self); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1256 | chan_read_failed(c); |
| 1257 | } |
| 1258 | } else { |
| 1259 | buffer_append(&c->input, buf, len); |
| 1260 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1261 | } |
| 1262 | return 1; |
| 1263 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1264 | static int |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1265 | channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset) |
| 1266 | { |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 1267 | struct termios tio; |
Ben Lindstrom | 6d218f4 | 2001-09-18 05:53:12 +0000 | [diff] [blame] | 1268 | u_char *data; |
| 1269 | u_int dlen; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1270 | int len; |
| 1271 | |
| 1272 | /* Send buffered output data to the socket. */ |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 1273 | if (c->wfd != -1 && |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1274 | FD_ISSET(c->wfd, writeset) && |
| 1275 | buffer_len(&c->output) > 0) { |
Ben Lindstrom | 6d218f4 | 2001-09-18 05:53:12 +0000 | [diff] [blame] | 1276 | data = buffer_ptr(&c->output); |
| 1277 | dlen = buffer_len(&c->output); |
| 1278 | len = write(c->wfd, data, dlen); |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 1279 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
| 1280 | return 1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1281 | if (len <= 0) { |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1282 | if (c->type != SSH_CHANNEL_OPEN) { |
| 1283 | debug("channel %d: not open", c->self); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1284 | chan_mark_dead(c); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1285 | return -1; |
| 1286 | } else if (compat13) { |
Damien Miller | 76765c0 | 2002-01-22 23:21:15 +1100 | [diff] [blame] | 1287 | buffer_clear(&c->output); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1288 | debug("channel %d: input draining.", c->self); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1289 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
| 1290 | } else { |
| 1291 | chan_write_failed(c); |
| 1292 | } |
| 1293 | return -1; |
| 1294 | } |
Ben Lindstrom | 6d218f4 | 2001-09-18 05:53:12 +0000 | [diff] [blame] | 1295 | if (compat20 && c->isatty && dlen >= 1 && data[0] != '\r') { |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1296 | if (tcgetattr(c->wfd, &tio) == 0 && |
| 1297 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { |
| 1298 | /* |
| 1299 | * Simulate echo to reduce the impact of |
Ben Lindstrom | b40204b | 2001-03-05 06:29:44 +0000 | [diff] [blame] | 1300 | * traffic analysis. We need to match the |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 1301 | * size of a SSH2_MSG_CHANNEL_DATA message |
| 1302 | * (4 byte channel id + data) |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1303 | */ |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 1304 | packet_send_ignore(4 + len); |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1305 | packet_send(); |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1306 | } |
| 1307 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1308 | buffer_consume(&c->output, len); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1309 | if (compat20 && len > 0) { |
| 1310 | c->local_consumed += len; |
| 1311 | } |
| 1312 | } |
| 1313 | return 1; |
| 1314 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1315 | static int |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1316 | channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset) |
| 1317 | { |
| 1318 | char buf[16*1024]; |
| 1319 | int len; |
| 1320 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1321 | /** XXX handle drain efd, too */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1322 | if (c->efd != -1) { |
| 1323 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
| 1324 | FD_ISSET(c->efd, writeset) && |
| 1325 | buffer_len(&c->extended) > 0) { |
| 1326 | len = write(c->efd, buffer_ptr(&c->extended), |
| 1327 | buffer_len(&c->extended)); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1328 | debug2("channel %d: written %d to efd %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1329 | c->self, len, c->efd); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1330 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
| 1331 | return 1; |
| 1332 | if (len <= 0) { |
| 1333 | debug2("channel %d: closing write-efd %d", |
| 1334 | c->self, c->efd); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 1335 | channel_close_fd(&c->efd); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1336 | } else { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1337 | buffer_consume(&c->extended, len); |
| 1338 | c->local_consumed += len; |
| 1339 | } |
| 1340 | } else if (c->extended_usage == CHAN_EXTENDED_READ && |
| 1341 | FD_ISSET(c->efd, readset)) { |
| 1342 | len = read(c->efd, buf, sizeof(buf)); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1343 | debug2("channel %d: read %d from efd %d", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1344 | c->self, len, c->efd); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1345 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
| 1346 | return 1; |
| 1347 | if (len <= 0) { |
| 1348 | debug2("channel %d: closing read-efd %d", |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1349 | c->self, c->efd); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 1350 | channel_close_fd(&c->efd); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1351 | } else { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1352 | buffer_append(&c->extended, buf, len); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1353 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1354 | } |
| 1355 | } |
| 1356 | return 1; |
| 1357 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1358 | static int |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1359 | channel_check_window(Channel *c) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1360 | { |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1361 | if (c->type == SSH_CHANNEL_OPEN && |
| 1362 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1363 | c->local_window < c->local_window_max/2 && |
| 1364 | c->local_consumed > 0) { |
| 1365 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
| 1366 | packet_put_int(c->remote_id); |
| 1367 | packet_put_int(c->local_consumed); |
| 1368 | packet_send(); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1369 | debug2("channel %d: window %d sent adjust %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1370 | c->self, c->local_window, |
| 1371 | c->local_consumed); |
| 1372 | c->local_window += c->local_consumed; |
| 1373 | c->local_consumed = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1374 | } |
| 1375 | return 1; |
| 1376 | } |
| 1377 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1378 | static void |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1379 | channel_post_open(Channel *c, fd_set * readset, fd_set * writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1380 | { |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1381 | if (c->delayed) |
| 1382 | return; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1383 | channel_handle_rfd(c, readset, writeset); |
| 1384 | channel_handle_wfd(c, readset, writeset); |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1385 | if (!compat20) |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1386 | return; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1387 | channel_handle_efd(c, readset, writeset); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1388 | channel_check_window(c); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1389 | } |
| 1390 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1391 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1392 | channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset) |
| 1393 | { |
| 1394 | int len; |
| 1395 | /* Send buffered output data to the socket. */ |
| 1396 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { |
| 1397 | len = write(c->sock, buffer_ptr(&c->output), |
| 1398 | buffer_len(&c->output)); |
| 1399 | if (len <= 0) |
Damien Miller | 76765c0 | 2002-01-22 23:21:15 +1100 | [diff] [blame] | 1400 | buffer_clear(&c->output); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1401 | else |
| 1402 | buffer_consume(&c->output, len); |
| 1403 | } |
| 1404 | } |
| 1405 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1406 | static void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1407 | channel_handler_init_20(void) |
| 1408 | { |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1409 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1410 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1411 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1412 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1413 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1414 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1415 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1416 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1417 | |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1418 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1419 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1420 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1421 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1422 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1423 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1424 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1425 | } |
| 1426 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1427 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1428 | channel_handler_init_13(void) |
| 1429 | { |
| 1430 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; |
| 1431 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; |
| 1432 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
| 1433 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
| 1434 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
| 1435 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; |
| 1436 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1437 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1438 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1439 | |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1440 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1441 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
| 1442 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
| 1443 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
| 1444 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1445 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1446 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1447 | } |
| 1448 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1449 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1450 | channel_handler_init_15(void) |
| 1451 | { |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1452 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1453 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1454 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
| 1455 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
| 1456 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1457 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1458 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1459 | |
| 1460 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
| 1461 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
| 1462 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1463 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1464 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1465 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1466 | } |
| 1467 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1468 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1469 | channel_handler_init(void) |
| 1470 | { |
| 1471 | int i; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1472 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1473 | channel_pre[i] = NULL; |
| 1474 | channel_post[i] = NULL; |
| 1475 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1476 | if (compat20) |
| 1477 | channel_handler_init_20(); |
| 1478 | else if (compat13) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1479 | channel_handler_init_13(); |
| 1480 | else |
| 1481 | channel_handler_init_15(); |
| 1482 | } |
| 1483 | |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 1484 | /* gc dead channels */ |
| 1485 | static void |
| 1486 | channel_garbage_collect(Channel *c) |
| 1487 | { |
| 1488 | if (c == NULL) |
| 1489 | return; |
| 1490 | if (c->detach_user != NULL) { |
| 1491 | if (!chan_is_dead(c, 0)) |
| 1492 | return; |
| 1493 | debug("channel %d: gc: notify user", c->self); |
| 1494 | c->detach_user(c->self, NULL); |
| 1495 | /* if we still have a callback */ |
| 1496 | if (c->detach_user != NULL) |
| 1497 | return; |
| 1498 | debug("channel %d: gc: user detached", c->self); |
| 1499 | } |
| 1500 | if (!chan_is_dead(c, 1)) |
| 1501 | return; |
| 1502 | debug("channel %d: garbage collecting", c->self); |
| 1503 | channel_free(c); |
| 1504 | } |
| 1505 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1506 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1507 | channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset) |
| 1508 | { |
| 1509 | static int did_init = 0; |
| 1510 | int i; |
| 1511 | Channel *c; |
| 1512 | |
| 1513 | if (!did_init) { |
| 1514 | channel_handler_init(); |
| 1515 | did_init = 1; |
| 1516 | } |
| 1517 | for (i = 0; i < channels_alloc; i++) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1518 | c = channels[i]; |
| 1519 | if (c == NULL) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1520 | continue; |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 1521 | if (ftab[c->type] != NULL) |
| 1522 | (*ftab[c->type])(c, readset, writeset); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 1523 | channel_garbage_collect(c); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1524 | } |
| 1525 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1526 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1527 | /* |
| 1528 | * Allocate/update select bitmasks and add any bits relevant to channels in |
| 1529 | * select bitmasks. |
| 1530 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1531 | void |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 1532 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 1533 | int *nallocp, int rekeying) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1534 | { |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1535 | int n; |
| 1536 | u_int sz; |
| 1537 | |
| 1538 | n = MAX(*maxfdp, channel_max_fd); |
| 1539 | |
| 1540 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 1541 | /* perhaps check sz < nalloc/2 and shrink? */ |
| 1542 | if (*readsetp == NULL || sz > *nallocp) { |
| 1543 | *readsetp = xrealloc(*readsetp, sz); |
| 1544 | *writesetp = xrealloc(*writesetp, sz); |
| 1545 | *nallocp = sz; |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1546 | } |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 1547 | *maxfdp = n; |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1548 | memset(*readsetp, 0, sz); |
| 1549 | memset(*writesetp, 0, sz); |
| 1550 | |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 1551 | if (!rekeying) |
| 1552 | channel_handler(channel_pre, *readsetp, *writesetp); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1553 | } |
| 1554 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1555 | /* |
| 1556 | * After select, perform any appropriate operations for channels which have |
| 1557 | * events pending. |
| 1558 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1559 | void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1560 | channel_after_select(fd_set * readset, fd_set * writeset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1561 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1562 | channel_handler(channel_post, readset, writeset); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1563 | } |
| 1564 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1565 | |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1566 | /* 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] | 1567 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1568 | void |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 1569 | channel_output_poll(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1570 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1571 | int len, i; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1572 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1573 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1574 | for (i = 0; i < channels_alloc; i++) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1575 | c = channels[i]; |
| 1576 | if (c == NULL) |
| 1577 | continue; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1578 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1579 | /* |
| 1580 | * We are only interested in channels that can have buffered |
| 1581 | * incoming data. |
| 1582 | */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1583 | if (compat13) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1584 | if (c->type != SSH_CHANNEL_OPEN && |
| 1585 | c->type != SSH_CHANNEL_INPUT_DRAINING) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1586 | continue; |
| 1587 | } else { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1588 | if (c->type != SSH_CHANNEL_OPEN) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1589 | continue; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1590 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1591 | if (compat20 && |
| 1592 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1593 | /* XXX is this true? */ |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 1594 | debug3("channel %d: will not send data after close", c->self); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1595 | continue; |
| 1596 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1597 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1598 | /* Get the amount of buffered data for this channel. */ |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1599 | if ((c->istate == CHAN_INPUT_OPEN || |
| 1600 | c->istate == CHAN_INPUT_WAIT_DRAIN) && |
| 1601 | (len = buffer_len(&c->input)) > 0) { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1602 | /* |
| 1603 | * Send some data for the other side over the secure |
| 1604 | * connection. |
| 1605 | */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1606 | if (compat20) { |
| 1607 | if (len > c->remote_window) |
| 1608 | len = c->remote_window; |
| 1609 | if (len > c->remote_maxpacket) |
| 1610 | len = c->remote_maxpacket; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1611 | } else { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1612 | if (packet_is_interactive()) { |
| 1613 | if (len > 1024) |
| 1614 | len = 512; |
| 1615 | } else { |
| 1616 | /* Keep the packets at reasonable size. */ |
| 1617 | if (len > packet_get_maxsize()/2) |
| 1618 | len = packet_get_maxsize()/2; |
| 1619 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1620 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1621 | if (len > 0) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1622 | packet_start(compat20 ? |
| 1623 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1624 | packet_put_int(c->remote_id); |
| 1625 | packet_put_string(buffer_ptr(&c->input), len); |
| 1626 | packet_send(); |
| 1627 | buffer_consume(&c->input, len); |
| 1628 | c->remote_window -= len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1629 | } |
| 1630 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1631 | if (compat13) |
| 1632 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1633 | /* |
| 1634 | * input-buffer is empty and read-socket shutdown: |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 1635 | * tell peer, that we will not send more data: send IEOF. |
| 1636 | * hack for extended data: delay EOF if EFD still in use. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1637 | */ |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 1638 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
Ben Lindstrom | 5a6abda | 2002-06-09 19:41:48 +0000 | [diff] [blame] | 1639 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
| 1640 | c->self, c->efd, buffer_len(&c->extended)); |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 1641 | else |
| 1642 | chan_ibuf_empty(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1643 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1644 | /* Send extended data, i.e. stderr */ |
| 1645 | if (compat20 && |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 1646 | !(c->flags & CHAN_EOF_SENT) && |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1647 | c->remote_window > 0 && |
| 1648 | (len = buffer_len(&c->extended)) > 0 && |
| 1649 | c->extended_usage == CHAN_EXTENDED_READ) { |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1650 | debug2("channel %d: rwin %d elen %d euse %d", |
| 1651 | c->self, c->remote_window, buffer_len(&c->extended), |
| 1652 | c->extended_usage); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1653 | if (len > c->remote_window) |
| 1654 | len = c->remote_window; |
| 1655 | if (len > c->remote_maxpacket) |
| 1656 | len = c->remote_maxpacket; |
| 1657 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); |
| 1658 | packet_put_int(c->remote_id); |
| 1659 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); |
| 1660 | packet_put_string(buffer_ptr(&c->extended), len); |
| 1661 | packet_send(); |
| 1662 | buffer_consume(&c->extended, len); |
| 1663 | c->remote_window -= len; |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1664 | debug2("channel %d: sent ext data %d", c->self, len); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1665 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1666 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1667 | } |
| 1668 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1669 | |
| 1670 | /* -- protocol input */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1671 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1672 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1673 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1674 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1675 | int id; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1676 | char *data; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1677 | u_int data_len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1678 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1679 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1680 | /* Get the channel number and verify it. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1681 | id = packet_get_int(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1682 | c = channel_lookup(id); |
| 1683 | if (c == NULL) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1684 | packet_disconnect("Received data for nonexistent channel %d.", id); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1685 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1686 | /* Ignore any data for non-open channels (might happen on close) */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1687 | if (c->type != SSH_CHANNEL_OPEN && |
| 1688 | c->type != SSH_CHANNEL_X11_OPEN) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1689 | return; |
| 1690 | |
| 1691 | /* same for protocol 1.5 if output end is no longer open */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1692 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1693 | return; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1694 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1695 | /* Get the data. */ |
| 1696 | data = packet_get_string(&data_len); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1697 | |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1698 | if (compat20) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1699 | if (data_len > c->local_maxpacket) { |
| 1700 | log("channel %d: rcvd big packet %d, maxpack %d", |
| 1701 | c->self, data_len, c->local_maxpacket); |
| 1702 | } |
| 1703 | if (data_len > c->local_window) { |
| 1704 | log("channel %d: rcvd too much data %d, win %d", |
| 1705 | c->self, data_len, c->local_window); |
| 1706 | xfree(data); |
| 1707 | return; |
| 1708 | } |
| 1709 | c->local_window -= data_len; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1710 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1711 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1712 | buffer_append(&c->output, data, data_len); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1713 | xfree(data); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1714 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1715 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1716 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1717 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1718 | { |
| 1719 | int id; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1720 | char *data; |
Ben Lindstrom | daa2179 | 2002-06-25 23:15:30 +0000 | [diff] [blame] | 1721 | u_int data_len, tcode; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1722 | Channel *c; |
| 1723 | |
| 1724 | /* Get the channel number and verify it. */ |
| 1725 | id = packet_get_int(); |
| 1726 | c = channel_lookup(id); |
| 1727 | |
| 1728 | if (c == NULL) |
| 1729 | packet_disconnect("Received extended_data for bad channel %d.", id); |
| 1730 | if (c->type != SSH_CHANNEL_OPEN) { |
| 1731 | log("channel %d: ext data for non open", id); |
| 1732 | return; |
| 1733 | } |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 1734 | if (c->flags & CHAN_EOF_RCVD) { |
| 1735 | if (datafellows & SSH_BUG_EXTEOF) |
| 1736 | debug("channel %d: accepting ext data after eof", id); |
| 1737 | else |
| 1738 | packet_disconnect("Received extended_data after EOF " |
| 1739 | "on channel %d.", id); |
| 1740 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1741 | tcode = packet_get_int(); |
| 1742 | if (c->efd == -1 || |
| 1743 | c->extended_usage != CHAN_EXTENDED_WRITE || |
| 1744 | tcode != SSH2_EXTENDED_DATA_STDERR) { |
| 1745 | log("channel %d: bad ext data", c->self); |
| 1746 | return; |
| 1747 | } |
| 1748 | data = packet_get_string(&data_len); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1749 | packet_check_eom(); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1750 | if (data_len > c->local_window) { |
| 1751 | log("channel %d: rcvd too much extended_data %d, win %d", |
| 1752 | c->self, data_len, c->local_window); |
| 1753 | xfree(data); |
| 1754 | return; |
| 1755 | } |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1756 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1757 | c->local_window -= data_len; |
| 1758 | buffer_append(&c->extended, data, data_len); |
| 1759 | xfree(data); |
| 1760 | } |
| 1761 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1762 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1763 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1764 | { |
| 1765 | int id; |
| 1766 | Channel *c; |
| 1767 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1768 | id = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1769 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1770 | c = channel_lookup(id); |
| 1771 | if (c == NULL) |
| 1772 | packet_disconnect("Received ieof for nonexistent channel %d.", id); |
| 1773 | chan_rcvd_ieof(c); |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 1774 | |
| 1775 | /* XXX force input close */ |
Damien Miller | a90fc08 | 2002-01-22 23:19:38 +1100 | [diff] [blame] | 1776 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 1777 | debug("channel %d: FORCE input drain", c->self); |
| 1778 | c->istate = CHAN_INPUT_WAIT_DRAIN; |
Damien Miller | 73f1074 | 2002-01-22 23:34:52 +1100 | [diff] [blame] | 1779 | if (buffer_len(&c->input) == 0) |
| 1780 | chan_ibuf_empty(c); |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 1781 | } |
| 1782 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1783 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1784 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1785 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1786 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1787 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1788 | int id; |
| 1789 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1790 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1791 | id = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1792 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1793 | c = channel_lookup(id); |
| 1794 | if (c == NULL) |
| 1795 | packet_disconnect("Received close for nonexistent channel %d.", id); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1796 | |
| 1797 | /* |
| 1798 | * Send a confirmation that we have closed the channel and no more |
| 1799 | * data is coming for it. |
| 1800 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1801 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1802 | packet_put_int(c->remote_id); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1803 | packet_send(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1804 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1805 | /* |
| 1806 | * If the channel is in closed state, we have sent a close request, |
| 1807 | * and the other side will eventually respond with a confirmation. |
| 1808 | * Thus, we cannot free the channel here, because then there would be |
| 1809 | * no-one to receive the confirmation. The channel gets freed when |
| 1810 | * the confirmation arrives. |
| 1811 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1812 | if (c->type != SSH_CHANNEL_CLOSED) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1813 | /* |
| 1814 | * Not a closed channel - mark it as draining, which will |
| 1815 | * cause it to be freed later. |
| 1816 | */ |
Damien Miller | 76765c0 | 2002-01-22 23:21:15 +1100 | [diff] [blame] | 1817 | buffer_clear(&c->input); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1818 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1819 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1820 | } |
| 1821 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1822 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1823 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1824 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1825 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1826 | int id = packet_get_int(); |
| 1827 | Channel *c = channel_lookup(id); |
Damien Miller | 66823cd | 2002-01-22 23:11:38 +1100 | [diff] [blame] | 1828 | |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1829 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1830 | if (c == NULL) |
| 1831 | packet_disconnect("Received oclose for nonexistent channel %d.", id); |
| 1832 | chan_rcvd_oclose(c); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1833 | } |
| 1834 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1835 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1836 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1837 | { |
| 1838 | int id = packet_get_int(); |
| 1839 | Channel *c = channel_lookup(id); |
| 1840 | |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1841 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1842 | if (c == NULL) |
| 1843 | packet_disconnect("Received close confirmation for " |
| 1844 | "out-of-range channel %d.", id); |
| 1845 | if (c->type != SSH_CHANNEL_CLOSED) |
| 1846 | packet_disconnect("Received close confirmation for " |
| 1847 | "non-closed channel %d (type %d).", id, c->type); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1848 | channel_free(c); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1849 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1850 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1851 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1852 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1853 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1854 | int id, remote_id; |
| 1855 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1856 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1857 | id = packet_get_int(); |
| 1858 | c = channel_lookup(id); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1859 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1860 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
| 1861 | packet_disconnect("Received open confirmation for " |
| 1862 | "non-opening channel %d.", id); |
| 1863 | remote_id = packet_get_int(); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1864 | /* 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] | 1865 | c->remote_id = remote_id; |
| 1866 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1867 | |
| 1868 | if (compat20) { |
| 1869 | c->remote_window = packet_get_int(); |
| 1870 | c->remote_maxpacket = packet_get_int(); |
Damien Miller | 67f0bc0 | 2002-02-05 12:23:08 +1100 | [diff] [blame] | 1871 | if (c->confirm) { |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1872 | debug2("callback start"); |
Damien Miller | 67f0bc0 | 2002-02-05 12:23:08 +1100 | [diff] [blame] | 1873 | c->confirm(c->self, NULL); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1874 | debug2("callback done"); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1875 | } |
| 1876 | debug("channel %d: open confirm rwindow %d rmax %d", c->self, |
| 1877 | c->remote_window, c->remote_maxpacket); |
| 1878 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1879 | packet_check_eom(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1880 | } |
| 1881 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1882 | static char * |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1883 | reason2txt(int reason) |
| 1884 | { |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1885 | switch (reason) { |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1886 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
| 1887 | return "administratively prohibited"; |
| 1888 | case SSH2_OPEN_CONNECT_FAILED: |
| 1889 | return "connect failed"; |
| 1890 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: |
| 1891 | return "unknown channel type"; |
| 1892 | case SSH2_OPEN_RESOURCE_SHORTAGE: |
| 1893 | return "resource shortage"; |
| 1894 | } |
Ben Lindstrom | e259544 | 2001-06-05 20:01:39 +0000 | [diff] [blame] | 1895 | return "unknown reason"; |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1896 | } |
| 1897 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1898 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1899 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1900 | { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 1901 | int id, reason; |
| 1902 | char *msg = NULL, *lang = NULL; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1903 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1904 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1905 | id = packet_get_int(); |
| 1906 | c = channel_lookup(id); |
| 1907 | |
| 1908 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
| 1909 | packet_disconnect("Received open failure for " |
| 1910 | "non-opening channel %d.", id); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1911 | if (compat20) { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 1912 | reason = packet_get_int(); |
Ben Lindstrom | f343674 | 2001-04-29 19:52:00 +0000 | [diff] [blame] | 1913 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 1914 | msg = packet_get_string(NULL); |
| 1915 | lang = packet_get_string(NULL); |
| 1916 | } |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1917 | log("channel %d: open failed: %s%s%s", id, |
| 1918 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 1919 | if (msg != NULL) |
| 1920 | xfree(msg); |
| 1921 | if (lang != NULL) |
| 1922 | xfree(lang); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1923 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1924 | packet_check_eom(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1925 | /* Free the channel. This will also close the socket. */ |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1926 | channel_free(c); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1927 | } |
| 1928 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1929 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1930 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1931 | { |
| 1932 | Channel *c; |
| 1933 | int id, adjust; |
| 1934 | |
| 1935 | if (!compat20) |
| 1936 | return; |
| 1937 | |
| 1938 | /* Get the channel number and verify it. */ |
| 1939 | id = packet_get_int(); |
| 1940 | c = channel_lookup(id); |
| 1941 | |
| 1942 | if (c == NULL || c->type != SSH_CHANNEL_OPEN) { |
| 1943 | log("Received window adjust for " |
| 1944 | "non-open channel %d.", id); |
| 1945 | return; |
| 1946 | } |
| 1947 | adjust = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1948 | packet_check_eom(); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1949 | debug2("channel %d: rcvd adjust %d", id, adjust); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1950 | c->remote_window += adjust; |
| 1951 | } |
| 1952 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1953 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1954 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1955 | { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1956 | Channel *c = NULL; |
| 1957 | u_short host_port; |
| 1958 | char *host, *originator_string; |
| 1959 | int remote_id, sock = -1; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1960 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1961 | remote_id = packet_get_int(); |
| 1962 | host = packet_get_string(NULL); |
| 1963 | host_port = packet_get_int(); |
| 1964 | |
| 1965 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { |
| 1966 | originator_string = packet_get_string(NULL); |
| 1967 | } else { |
| 1968 | originator_string = xstrdup("unknown (remote did not supply name)"); |
| 1969 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1970 | packet_check_eom(); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1971 | sock = channel_connect_to(host, host_port); |
| 1972 | if (sock != -1) { |
| 1973 | c = channel_new("connected socket", |
| 1974 | SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0, |
| 1975 | originator_string, 1); |
Damien Miller | 699d003 | 2002-02-08 22:07:16 +1100 | [diff] [blame] | 1976 | c->remote_id = remote_id; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1977 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1978 | if (c == NULL) { |
| 1979 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 1980 | packet_put_int(remote_id); |
| 1981 | packet_send(); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1982 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1983 | xfree(host); |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 1984 | } |
| 1985 | |
| 1986 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1987 | /* -- tcp forwarding */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1988 | |
Ben Lindstrom | 908afed | 2001-10-03 17:34:59 +0000 | [diff] [blame] | 1989 | void |
| 1990 | channel_set_af(int af) |
| 1991 | { |
| 1992 | IPv4or6 = af; |
| 1993 | } |
| 1994 | |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 1995 | static int |
| 1996 | channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port, |
| 1997 | 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] | 1998 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1999 | Channel *c; |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2000 | int success, sock, on = 1; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2001 | struct addrinfo hints, *ai, *aitop; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2002 | const char *host; |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2003 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2004 | struct linger linger; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2005 | |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2006 | success = 0; |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2007 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
| 2008 | listen_addr : host_to_connect; |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2009 | |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2010 | if (host == NULL) { |
| 2011 | error("No forward host name."); |
| 2012 | return success; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2013 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2014 | if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2015 | error("Forward host name too long."); |
| 2016 | return success; |
| 2017 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2018 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2019 | /* |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2020 | * getaddrinfo returns a loopback address if the hostname is |
| 2021 | * set to NULL and hints.ai_flags is not AI_PASSIVE |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2022 | */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2023 | memset(&hints, 0, sizeof(hints)); |
| 2024 | hints.ai_family = IPv4or6; |
| 2025 | hints.ai_flags = gateway_ports ? AI_PASSIVE : 0; |
| 2026 | hints.ai_socktype = SOCK_STREAM; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2027 | snprintf(strport, sizeof strport, "%d", listen_port); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2028 | if (getaddrinfo(NULL, strport, &hints, &aitop) != 0) |
| 2029 | packet_disconnect("getaddrinfo: fatal error"); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2030 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2031 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 2032 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 2033 | continue; |
| 2034 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
| 2035 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2036 | error("channel_setup_fwd_listener: getnameinfo failed"); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2037 | continue; |
| 2038 | } |
| 2039 | /* Create a port to listen for the host. */ |
| 2040 | sock = socket(ai->ai_family, SOCK_STREAM, 0); |
| 2041 | if (sock < 0) { |
| 2042 | /* this is no error since kernel may not support ipv6 */ |
| 2043 | verbose("socket: %.100s", strerror(errno)); |
| 2044 | continue; |
| 2045 | } |
| 2046 | /* |
| 2047 | * Set socket options. We would like the socket to disappear |
| 2048 | * as soon as it has been closed for whatever reason. |
| 2049 | */ |
Ben Lindstrom | 733a235 | 2002-03-05 01:31:28 +0000 | [diff] [blame] | 2050 | setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2051 | linger.l_onoff = 1; |
| 2052 | linger.l_linger = 5; |
Ben Lindstrom | 733a235 | 2002-03-05 01:31:28 +0000 | [diff] [blame] | 2053 | setsockopt(sock, SOL_SOCKET, SO_LINGER, &linger, sizeof(linger)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2054 | debug("Local forwarding listening on %s port %s.", ntop, strport); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2055 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2056 | /* Bind the socket to the address. */ |
| 2057 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
| 2058 | /* address can be in use ipv6 address is already bound */ |
Damien Miller | 3c7eeb2 | 2000-03-03 22:35:33 +1100 | [diff] [blame] | 2059 | if (!ai->ai_next) |
| 2060 | error("bind: %.100s", strerror(errno)); |
| 2061 | else |
| 2062 | verbose("bind: %.100s", strerror(errno)); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 2063 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2064 | close(sock); |
| 2065 | continue; |
| 2066 | } |
| 2067 | /* Start listening for connections on the socket. */ |
| 2068 | if (listen(sock, 5) < 0) { |
| 2069 | error("listen: %.100s", strerror(errno)); |
| 2070 | close(sock); |
| 2071 | continue; |
| 2072 | } |
| 2073 | /* Allocate a channel number for the socket. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2074 | c = channel_new("port listener", type, sock, sock, -1, |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2075 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 2076 | 0, xstrdup("port listener"), 1); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2077 | strlcpy(c->path, host, sizeof(c->path)); |
| 2078 | c->host_port = port_to_connect; |
| 2079 | c->listening_port = listen_port; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2080 | success = 1; |
| 2081 | } |
| 2082 | if (success == 0) |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2083 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2084 | listen_port); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2085 | freeaddrinfo(aitop); |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2086 | return success; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2087 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2088 | |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2089 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
| 2090 | int |
| 2091 | channel_setup_local_fwd_listener(u_short listen_port, |
| 2092 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
| 2093 | { |
| 2094 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, |
| 2095 | NULL, listen_port, host_to_connect, port_to_connect, gateway_ports); |
| 2096 | } |
| 2097 | |
| 2098 | /* protocol v2 remote port fwd, used by sshd */ |
| 2099 | int |
| 2100 | channel_setup_remote_fwd_listener(const char *listen_address, |
| 2101 | u_short listen_port, int gateway_ports) |
| 2102 | { |
| 2103 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, |
| 2104 | listen_address, listen_port, NULL, 0, gateway_ports); |
| 2105 | } |
| 2106 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2107 | /* |
| 2108 | * Initiate forwarding of connections to port "port" on remote host through |
| 2109 | * the secure channel to host:port from local side. |
| 2110 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2111 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2112 | void |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2113 | channel_request_remote_forwarding(u_short listen_port, |
| 2114 | const char *host_to_connect, u_short port_to_connect) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2115 | { |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 2116 | int type, success = 0; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2117 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2118 | /* Record locally that connection to this host/port is permitted. */ |
| 2119 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) |
| 2120 | fatal("channel_request_remote_forwarding: too many forwards"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2121 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2122 | /* Send the forward request to the remote side. */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2123 | if (compat20) { |
| 2124 | const char *address_to_bind = "0.0.0.0"; |
| 2125 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
| 2126 | packet_put_cstring("tcpip-forward"); |
Damien Miller | 2797f7f | 2002-04-23 21:09:44 +1000 | [diff] [blame] | 2127 | packet_put_char(1); /* boolean: want reply */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2128 | packet_put_cstring(address_to_bind); |
| 2129 | packet_put_int(listen_port); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2130 | packet_send(); |
| 2131 | packet_write_wait(); |
| 2132 | /* Assume that server accepts the request */ |
| 2133 | success = 1; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2134 | } else { |
| 2135 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2136 | packet_put_int(listen_port); |
Damien Miller | 8bb73be | 2000-04-19 16:26:12 +1000 | [diff] [blame] | 2137 | packet_put_cstring(host_to_connect); |
| 2138 | packet_put_int(port_to_connect); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2139 | packet_send(); |
| 2140 | packet_write_wait(); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2141 | |
| 2142 | /* Wait for response from the remote side. */ |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 2143 | type = packet_read(); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2144 | switch (type) { |
| 2145 | case SSH_SMSG_SUCCESS: |
| 2146 | success = 1; |
| 2147 | break; |
| 2148 | case SSH_SMSG_FAILURE: |
| 2149 | log("Warning: Server denied remote port forwarding."); |
| 2150 | break; |
| 2151 | default: |
| 2152 | /* Unknown packet */ |
| 2153 | packet_disconnect("Protocol error for port forward request:" |
| 2154 | "received packet type %d.", type); |
| 2155 | } |
| 2156 | } |
| 2157 | if (success) { |
| 2158 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); |
| 2159 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; |
| 2160 | permitted_opens[num_permitted_opens].listen_port = listen_port; |
| 2161 | num_permitted_opens++; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2162 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2163 | } |
| 2164 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2165 | /* |
| 2166 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates |
| 2167 | * listening for the port, and sends back a success reply (or disconnect |
| 2168 | * message if there was an error). This never returns if there was an error. |
| 2169 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2170 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2171 | void |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2172 | channel_input_port_forward_request(int is_root, int gateway_ports) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2173 | { |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 2174 | u_short port, host_port; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2175 | char *hostname; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2176 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2177 | /* Get arguments from the packet. */ |
| 2178 | port = packet_get_int(); |
| 2179 | hostname = packet_get_string(NULL); |
| 2180 | host_port = packet_get_int(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2181 | |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 2182 | #ifndef HAVE_CYGWIN |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2183 | /* |
| 2184 | * Check that an unprivileged user is not trying to forward a |
| 2185 | * privileged port. |
| 2186 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2187 | if (port < IPPORT_RESERVED && !is_root) |
| 2188 | packet_disconnect("Requested forwarding of port %d but user is not root.", |
| 2189 | port); |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 2190 | #endif |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2191 | /* Initiate forwarding */ |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2192 | channel_setup_local_fwd_listener(port, hostname, host_port, gateway_ports); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2193 | |
| 2194 | /* Free the argument string. */ |
| 2195 | xfree(hostname); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2196 | } |
| 2197 | |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2198 | /* |
| 2199 | * Permits opening to any host/port if permitted_opens[] is empty. This is |
| 2200 | * usually called by the server, because the user could connect to any port |
| 2201 | * anyway, and the server has no way to know but to trust the client anyway. |
| 2202 | */ |
| 2203 | void |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 2204 | channel_permit_all_opens(void) |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2205 | { |
| 2206 | if (num_permitted_opens == 0) |
| 2207 | all_opens_permitted = 1; |
| 2208 | } |
| 2209 | |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 2210 | void |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2211 | channel_add_permitted_opens(char *host, int port) |
| 2212 | { |
| 2213 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) |
| 2214 | fatal("channel_request_remote_forwarding: too many forwards"); |
| 2215 | debug("allow port forwarding to host %s port %d", host, port); |
| 2216 | |
| 2217 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); |
| 2218 | permitted_opens[num_permitted_opens].port_to_connect = port; |
| 2219 | num_permitted_opens++; |
| 2220 | |
| 2221 | all_opens_permitted = 0; |
| 2222 | } |
| 2223 | |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 2224 | void |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2225 | channel_clear_permitted_opens(void) |
| 2226 | { |
| 2227 | int i; |
| 2228 | |
| 2229 | for (i = 0; i < num_permitted_opens; i++) |
| 2230 | xfree(permitted_opens[i].host_to_connect); |
| 2231 | num_permitted_opens = 0; |
| 2232 | |
| 2233 | } |
| 2234 | |
| 2235 | |
| 2236 | /* return socket to remote host, port */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2237 | static int |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2238 | connect_to(const char *host, u_short port) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2239 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2240 | struct addrinfo hints, *ai, *aitop; |
| 2241 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
| 2242 | int gaierr; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2243 | int sock = -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2244 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2245 | memset(&hints, 0, sizeof(hints)); |
| 2246 | hints.ai_family = IPv4or6; |
| 2247 | hints.ai_socktype = SOCK_STREAM; |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2248 | snprintf(strport, sizeof strport, "%d", port); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2249 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2250 | error("connect_to %.100s: unknown host (%s)", host, |
| 2251 | gai_strerror(gaierr)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2252 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2253 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2254 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 2255 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 2256 | continue; |
| 2257 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
| 2258 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2259 | error("connect_to: getnameinfo failed"); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2260 | continue; |
| 2261 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2262 | sock = socket(ai->ai_family, SOCK_STREAM, 0); |
| 2263 | if (sock < 0) { |
| 2264 | error("socket: %.100s", strerror(errno)); |
| 2265 | continue; |
| 2266 | } |
Ben Lindstrom | 48bd7c1 | 2001-01-09 00:35:42 +0000 | [diff] [blame] | 2267 | if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0) |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 2268 | fatal("connect_to: F_SETFL: %s", strerror(errno)); |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 2269 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 && |
| 2270 | errno != EINPROGRESS) { |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2271 | error("connect_to %.100s port %s: %.100s", ntop, strport, |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2272 | strerror(errno)); |
| 2273 | close(sock); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 2274 | continue; /* fail -- try next */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2275 | } |
| 2276 | break; /* success */ |
| 2277 | |
| 2278 | } |
| 2279 | freeaddrinfo(aitop); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2280 | if (!ai) { |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2281 | error("connect_to %.100s port %d: failed.", host, port); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2282 | return -1; |
| 2283 | } |
| 2284 | /* success */ |
Ben Lindstrom | 1ebd7a5 | 2002-02-26 18:12:51 +0000 | [diff] [blame] | 2285 | set_nodelay(sock); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2286 | return sock; |
| 2287 | } |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2288 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2289 | int |
Ben Lindstrom | 173e646 | 2001-07-04 05:15:15 +0000 | [diff] [blame] | 2290 | channel_connect_by_listen_address(u_short listen_port) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2291 | { |
| 2292 | int i; |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2293 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2294 | for (i = 0; i < num_permitted_opens; i++) |
| 2295 | if (permitted_opens[i].listen_port == listen_port) |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2296 | return connect_to( |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2297 | permitted_opens[i].host_to_connect, |
| 2298 | permitted_opens[i].port_to_connect); |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 2299 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
| 2300 | listen_port); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2301 | return -1; |
| 2302 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2303 | |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2304 | /* Check if connecting to that port is permitted and connect. */ |
| 2305 | int |
| 2306 | channel_connect_to(const char *host, u_short port) |
| 2307 | { |
| 2308 | int i, permit; |
| 2309 | |
| 2310 | permit = all_opens_permitted; |
| 2311 | if (!permit) { |
| 2312 | for (i = 0; i < num_permitted_opens; i++) |
| 2313 | if (permitted_opens[i].port_to_connect == port && |
| 2314 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
| 2315 | permit = 1; |
| 2316 | |
| 2317 | } |
| 2318 | if (!permit) { |
| 2319 | log("Received request to connect to host %.100s port %d, " |
| 2320 | "but the request was denied.", host, port); |
| 2321 | return -1; |
| 2322 | } |
| 2323 | return connect_to(host, port); |
| 2324 | } |
| 2325 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2326 | /* -- X11 forwarding */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2327 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2328 | /* |
| 2329 | * Creates an internet domain socket for listening for X11 connections. |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2330 | * Returns 0 and a suitable display number for the DISPLAY variable |
| 2331 | * stored in display_numberp , or -1 if an error occurs. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2332 | */ |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2333 | int |
Damien Miller | 95c249f | 2002-02-05 12:11:34 +1100 | [diff] [blame] | 2334 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2335 | int single_connection, u_int *display_numberp) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2336 | { |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 2337 | Channel *nc = NULL; |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 2338 | int display_number, sock; |
| 2339 | u_short port; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2340 | struct addrinfo hints, *ai, *aitop; |
| 2341 | char strport[NI_MAXSERV]; |
| 2342 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2343 | |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 2344 | for (display_number = x11_display_offset; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 2345 | display_number < MAX_DISPLAYS; |
| 2346 | display_number++) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2347 | port = 6000 + display_number; |
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 | 95c249f | 2002-02-05 12:11:34 +1100 | [diff] [blame] | 2350 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2351 | hints.ai_socktype = SOCK_STREAM; |
| 2352 | snprintf(strport, sizeof strport, "%d", port); |
| 2353 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { |
| 2354 | error("getaddrinfo: %.100s", gai_strerror(gaierr)); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2355 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2356 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2357 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 2358 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 2359 | continue; |
| 2360 | sock = socket(ai->ai_family, SOCK_STREAM, 0); |
| 2361 | if (sock < 0) { |
Damien Miller | 89d9796 | 2000-10-14 12:37:19 +1100 | [diff] [blame] | 2362 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
Damien Miller | e219273 | 2000-01-17 13:22:55 +1100 | [diff] [blame] | 2363 | error("socket: %.100s", strerror(errno)); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2364 | return -1; |
Damien Miller | e219273 | 2000-01-17 13:22:55 +1100 | [diff] [blame] | 2365 | } else { |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 2366 | debug("x11_create_display_inet: Socket family %d not supported", |
| 2367 | ai->ai_family); |
Damien Miller | e219273 | 2000-01-17 13:22:55 +1100 | [diff] [blame] | 2368 | continue; |
| 2369 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2370 | } |
Kevin Steves | df75dd2 | 2002-06-04 20:52:19 +0000 | [diff] [blame] | 2371 | #ifdef IPV6_V6ONLY |
| 2372 | if (ai->ai_family == AF_INET6) { |
| 2373 | int on = 1; |
| 2374 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0) |
| 2375 | error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno)); |
| 2376 | } |
| 2377 | #endif |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2378 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
| 2379 | debug("bind port %d: %.100s", port, strerror(errno)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2380 | close(sock); |
Damien Miller | 3c7eeb2 | 2000-03-03 22:35:33 +1100 | [diff] [blame] | 2381 | |
| 2382 | if (ai->ai_next) |
| 2383 | continue; |
| 2384 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2385 | for (n = 0; n < num_socks; n++) { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2386 | close(socks[n]); |
| 2387 | } |
| 2388 | num_socks = 0; |
| 2389 | break; |
| 2390 | } |
| 2391 | socks[num_socks++] = sock; |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 2392 | #ifndef DONT_TRY_OTHER_AF |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2393 | if (num_socks == NUM_SOCKS) |
| 2394 | break; |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 2395 | #else |
Kevin Steves | df75dd2 | 2002-06-04 20:52:19 +0000 | [diff] [blame] | 2396 | if (x11_use_localhost) { |
| 2397 | if (num_socks == NUM_SOCKS) |
| 2398 | break; |
| 2399 | } else { |
| 2400 | break; |
| 2401 | } |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 2402 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2403 | } |
Ben Lindstrom | 87b147f | 2001-01-25 00:41:12 +0000 | [diff] [blame] | 2404 | freeaddrinfo(aitop); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2405 | if (num_socks > 0) |
| 2406 | break; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2407 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2408 | if (display_number >= MAX_DISPLAYS) { |
| 2409 | error("Failed to allocate internet-domain X11 display socket."); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2410 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2411 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2412 | /* Start listening for connections on the socket. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2413 | for (n = 0; n < num_socks; n++) { |
| 2414 | sock = socks[n]; |
| 2415 | if (listen(sock, 5) < 0) { |
| 2416 | error("listen: %.100s", strerror(errno)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2417 | close(sock); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2418 | return -1; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2419 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2420 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2421 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2422 | /* Allocate a channel for each socket. */ |
| 2423 | for (n = 0; n < num_socks; n++) { |
| 2424 | sock = socks[n]; |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 2425 | nc = channel_new("x11 listener", |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2426 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
| 2427 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 2428 | 0, xstrdup("X11 inet listener"), 1); |
Damien Miller | 699d003 | 2002-02-08 22:07:16 +1100 | [diff] [blame] | 2429 | nc->single_connection = single_connection; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2430 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2431 | |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2432 | /* Return the display number for the DISPLAY environment variable. */ |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2433 | *display_numberp = display_number; |
| 2434 | return (0); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2435 | } |
| 2436 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2437 | static int |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 2438 | connect_local_xsocket(u_int dnr) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2439 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2440 | int sock; |
| 2441 | struct sockaddr_un addr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2442 | |
Damien Miller | 3afe375 | 2001-12-21 12:39:51 +1100 | [diff] [blame] | 2443 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
| 2444 | if (sock < 0) |
| 2445 | error("socket: %.100s", strerror(errno)); |
| 2446 | memset(&addr, 0, sizeof(addr)); |
| 2447 | addr.sun_family = AF_UNIX; |
| 2448 | snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr); |
| 2449 | if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0) |
| 2450 | return sock; |
| 2451 | close(sock); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2452 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
| 2453 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2454 | } |
| 2455 | |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2456 | int |
| 2457 | x11_connect_display(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2458 | { |
Damien Miller | 398e1cf | 2002-02-05 11:52:13 +1100 | [diff] [blame] | 2459 | int display_number, sock = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2460 | const char *display; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2461 | char buf[1024], *cp; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2462 | struct addrinfo hints, *ai, *aitop; |
| 2463 | char strport[NI_MAXSERV]; |
| 2464 | int gaierr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2465 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2466 | /* Try to open a socket for the local X server. */ |
| 2467 | display = getenv("DISPLAY"); |
| 2468 | if (!display) { |
| 2469 | error("DISPLAY not set."); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2470 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2471 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2472 | /* |
| 2473 | * Now we decode the value of the DISPLAY variable and make a |
| 2474 | * connection to the real X server. |
| 2475 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2476 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2477 | /* |
| 2478 | * Check if it is a unix domain socket. Unix domain displays are in |
| 2479 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] |
| 2480 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2481 | if (strncmp(display, "unix:", 5) == 0 || |
| 2482 | display[0] == ':') { |
| 2483 | /* Connect to the unix domain socket. */ |
| 2484 | if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) { |
| 2485 | error("Could not parse display number from DISPLAY: %.100s", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 2486 | display); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2487 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2488 | } |
| 2489 | /* Create a socket. */ |
| 2490 | sock = connect_local_xsocket(display_number); |
| 2491 | if (sock < 0) |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2492 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2493 | |
| 2494 | /* OK, we now have a connection to the display. */ |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2495 | return sock; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2496 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2497 | /* |
| 2498 | * Connect to an inet socket. The DISPLAY value is supposedly |
| 2499 | * hostname:d[.s], where hostname may also be numeric IP address. |
| 2500 | */ |
Ben Lindstrom | ccd8d07 | 2001-12-07 17:26:48 +0000 | [diff] [blame] | 2501 | strlcpy(buf, display, sizeof(buf)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2502 | cp = strchr(buf, ':'); |
| 2503 | if (!cp) { |
| 2504 | error("Could not find ':' in DISPLAY: %.100s", display); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2505 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2506 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2507 | *cp = 0; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2508 | /* 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] | 2509 | if (sscanf(cp + 1, "%d", &display_number) != 1) { |
| 2510 | error("Could not parse display number from DISPLAY: %.100s", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 2511 | display); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2512 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2513 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2514 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2515 | /* Look up the host address */ |
| 2516 | memset(&hints, 0, sizeof(hints)); |
| 2517 | hints.ai_family = IPv4or6; |
| 2518 | hints.ai_socktype = SOCK_STREAM; |
| 2519 | snprintf(strport, sizeof strport, "%d", 6000 + display_number); |
| 2520 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
| 2521 | error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr)); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2522 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2523 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2524 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 2525 | /* Create a socket. */ |
| 2526 | sock = socket(ai->ai_family, SOCK_STREAM, 0); |
| 2527 | if (sock < 0) { |
| 2528 | debug("socket: %.100s", strerror(errno)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2529 | continue; |
| 2530 | } |
| 2531 | /* Connect it to the display. */ |
| 2532 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
| 2533 | debug("connect %.100s port %d: %.100s", buf, |
| 2534 | 6000 + display_number, strerror(errno)); |
| 2535 | close(sock); |
| 2536 | continue; |
| 2537 | } |
| 2538 | /* Success */ |
| 2539 | break; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2540 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2541 | freeaddrinfo(aitop); |
| 2542 | if (!ai) { |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2543 | error("connect %.100s port %d: %.100s", buf, 6000 + display_number, |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2544 | strerror(errno)); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2545 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2546 | } |
Damien Miller | 398e1cf | 2002-02-05 11:52:13 +1100 | [diff] [blame] | 2547 | set_nodelay(sock); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2548 | return sock; |
| 2549 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2550 | |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2551 | /* |
| 2552 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains |
| 2553 | * the remote channel number. We should do whatever we want, and respond |
| 2554 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. |
| 2555 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2556 | |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2557 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2558 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2559 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2560 | Channel *c = NULL; |
| 2561 | int remote_id, sock = 0; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2562 | char *remote_host; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2563 | |
| 2564 | debug("Received X11 open request."); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2565 | |
| 2566 | remote_id = packet_get_int(); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2567 | |
| 2568 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2569 | remote_host = packet_get_string(NULL); |
| 2570 | } else { |
| 2571 | remote_host = xstrdup("unknown (remote did not supply name)"); |
| 2572 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2573 | packet_check_eom(); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2574 | |
| 2575 | /* Obtain a connection to the real X display. */ |
| 2576 | sock = x11_connect_display(); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2577 | if (sock != -1) { |
| 2578 | /* Allocate a channel for this connection. */ |
| 2579 | c = channel_new("connected x11 socket", |
| 2580 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, |
| 2581 | remote_host, 1); |
Damien Miller | 699d003 | 2002-02-08 22:07:16 +1100 | [diff] [blame] | 2582 | c->remote_id = remote_id; |
| 2583 | c->force_drain = 1; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2584 | } |
| 2585 | if (c == NULL) { |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2586 | /* Send refusal to the remote host. */ |
| 2587 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2588 | packet_put_int(remote_id); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2589 | } else { |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2590 | /* Send a confirmation to the remote host. */ |
| 2591 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2592 | packet_put_int(remote_id); |
| 2593 | packet_put_int(c->self); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2594 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2595 | packet_send(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2596 | } |
| 2597 | |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 2598 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
| 2599 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2600 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 2601 | { |
| 2602 | int rchan = packet_get_int(); |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 2603 | switch (type) { |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 2604 | case SSH_SMSG_AGENT_OPEN: |
| 2605 | error("Warning: ssh server tried agent forwarding."); |
| 2606 | break; |
| 2607 | case SSH_SMSG_X11_OPEN: |
| 2608 | error("Warning: ssh server tried X11 forwarding."); |
| 2609 | break; |
| 2610 | default: |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2611 | error("deny_input_open: type %d", type); |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 2612 | break; |
| 2613 | } |
| 2614 | error("Warning: this is probably a break in attempt by a malicious server."); |
| 2615 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 2616 | packet_put_int(rchan); |
| 2617 | packet_send(); |
| 2618 | } |
| 2619 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2620 | /* |
| 2621 | * Requests forwarding of X11 connections, generates fake authentication |
| 2622 | * data, and enables authentication spoofing. |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2623 | * This should be called in the client only. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2624 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2625 | void |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2626 | x11_request_forwarding_with_spoofing(int client_session_id, |
| 2627 | const char *proto, const char *data) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2628 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 2629 | u_int data_len = (u_int) strlen(data) / 2; |
Ben Lindstrom | b3211a8 | 2001-02-10 22:33:19 +0000 | [diff] [blame] | 2630 | u_int i, value, len; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2631 | char *new_data; |
| 2632 | int screen_number; |
| 2633 | const char *cp; |
| 2634 | u_int32_t rand = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2635 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2636 | cp = getenv("DISPLAY"); |
| 2637 | if (cp) |
| 2638 | cp = strchr(cp, ':'); |
| 2639 | if (cp) |
| 2640 | cp = strchr(cp, '.'); |
| 2641 | if (cp) |
| 2642 | screen_number = atoi(cp + 1); |
| 2643 | else |
| 2644 | screen_number = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2645 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2646 | /* Save protocol name. */ |
| 2647 | x11_saved_proto = xstrdup(proto); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2648 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2649 | /* |
| 2650 | * Extract real authentication data and generate fake data of the |
| 2651 | * same length. |
| 2652 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2653 | x11_saved_data = xmalloc(data_len); |
| 2654 | x11_fake_data = xmalloc(data_len); |
| 2655 | for (i = 0; i < data_len; i++) { |
| 2656 | if (sscanf(data + 2 * i, "%2x", &value) != 1) |
| 2657 | fatal("x11_request_forwarding: bad authentication data: %.100s", data); |
| 2658 | if (i % 4 == 0) |
| 2659 | rand = arc4random(); |
| 2660 | x11_saved_data[i] = value; |
| 2661 | x11_fake_data[i] = rand & 0xff; |
| 2662 | rand >>= 8; |
| 2663 | } |
| 2664 | x11_saved_data_len = data_len; |
| 2665 | x11_fake_data_len = data_len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2666 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2667 | /* Convert the fake data into hex. */ |
Ben Lindstrom | b3211a8 | 2001-02-10 22:33:19 +0000 | [diff] [blame] | 2668 | len = 2 * data_len + 1; |
| 2669 | new_data = xmalloc(len); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2670 | for (i = 0; i < data_len; i++) |
Ben Lindstrom | b3211a8 | 2001-02-10 22:33:19 +0000 | [diff] [blame] | 2671 | snprintf(new_data + 2 * i, len - 2 * i, |
| 2672 | "%02x", (u_char) x11_fake_data[i]); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2673 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2674 | /* Send the request packet. */ |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2675 | if (compat20) { |
| 2676 | channel_request_start(client_session_id, "x11-req", 0); |
| 2677 | packet_put_char(0); /* XXX bool single connection */ |
| 2678 | } else { |
| 2679 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); |
| 2680 | } |
| 2681 | packet_put_cstring(proto); |
| 2682 | packet_put_cstring(new_data); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2683 | packet_put_int(screen_number); |
| 2684 | packet_send(); |
| 2685 | packet_write_wait(); |
| 2686 | xfree(new_data); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2687 | } |
| 2688 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2689 | |
| 2690 | /* -- agent forwarding */ |
| 2691 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2692 | /* Sends a message to the server to request authentication fd forwarding. */ |
| 2693 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2694 | void |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 2695 | auth_request_forwarding(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2696 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2697 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
| 2698 | packet_send(); |
| 2699 | packet_write_wait(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2700 | } |
| 2701 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2702 | /* This is called to process an SSH_SMSG_AGENT_OPEN message. */ |
| 2703 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2704 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2705 | auth_input_open_request(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2706 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2707 | Channel *c = NULL; |
| 2708 | int remote_id, sock; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2709 | char *name; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2710 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2711 | /* Read the remote channel number from the message. */ |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2712 | remote_id = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2713 | packet_check_eom(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2714 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2715 | /* |
| 2716 | * Get a connection to the local authentication agent (this may again |
| 2717 | * get forwarded). |
| 2718 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2719 | sock = ssh_get_authentication_socket(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2720 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2721 | /* |
| 2722 | * If we could not connect the agent, send an error message back to |
| 2723 | * the server. This should never happen unless the agent dies, |
| 2724 | * because authentication forwarding is only enabled if we have an |
| 2725 | * agent. |
| 2726 | */ |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2727 | if (sock >= 0) { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2728 | name = xstrdup("authentication agent connection"); |
| 2729 | c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, |
| 2730 | -1, 0, 0, 0, name, 1); |
Damien Miller | 699d003 | 2002-02-08 22:07:16 +1100 | [diff] [blame] | 2731 | c->remote_id = remote_id; |
| 2732 | c->force_drain = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2733 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2734 | if (c == NULL) { |
| 2735 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 2736 | packet_put_int(remote_id); |
| 2737 | } else { |
| 2738 | /* Send a confirmation to the remote host. */ |
| 2739 | debug("Forwarding authentication connection."); |
| 2740 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 2741 | packet_put_int(remote_id); |
| 2742 | packet_put_int(c->self); |
| 2743 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2744 | packet_send(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2745 | } |