Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 4 | * All rights reserved |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 5 | * This file contains functions for generic socket connection forwarding. |
| 6 | * There is also code for initiating connection forwarding for X11 connections, |
| 7 | * arbitrary tcp/ip connections, and the authentication agent connection. |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 8 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 9 | * As far as I am concerned, the code I have written for this software |
| 10 | * can be used freely for any purpose. Any derived versions of this |
| 11 | * software must be clearly marked as such, and if the derived work is |
| 12 | * incompatible with the protocol description in the RFC file, it must be |
| 13 | * called by a name other than "ssh" or "Secure Shell". |
| 14 | * |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 15 | * SSH2 support added by Markus Friedl. |
Damien Miller | a90fc08 | 2002-01-22 23:19:38 +1100 | [diff] [blame] | 16 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 17 | * Copyright (c) 1999 Dug Song. All rights reserved. |
| 18 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. |
| 19 | * |
| 20 | * Redistribution and use in source and binary forms, with or without |
| 21 | * modification, are permitted provided that the following conditions |
| 22 | * are met: |
| 23 | * 1. Redistributions of source code must retain the above copyright |
| 24 | * notice, this list of conditions and the following disclaimer. |
| 25 | * 2. Redistributions in binary form must reproduce the above copyright |
| 26 | * notice, this list of conditions and the following disclaimer in the |
| 27 | * documentation and/or other materials provided with the distribution. |
| 28 | * |
| 29 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 30 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 31 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 32 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 33 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 34 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 35 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 36 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 37 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 38 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 39 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 40 | |
| 41 | #include "includes.h" |
Damien Miller | 2797f7f | 2002-04-23 21:09:44 +1000 | [diff] [blame^] | 42 | RCSID("$OpenBSD: channels.c,v 1.173 2002/04/22 21:04:52 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" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 49 | #include "uidswap.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 50 | #include "log.h" |
| 51 | #include "misc.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 52 | #include "channels.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 53 | #include "compat.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 54 | #include "canohost.h" |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 55 | #include "key.h" |
| 56 | #include "authfd.h" |
Damien Miller | 3afe375 | 2001-12-21 12:39:51 +1100 | [diff] [blame] | 57 | #include "pathnames.h" |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 58 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 59 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 60 | /* -- channel core */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 61 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 62 | /* |
| 63 | * Pointer to an array containing all allocated channels. The array is |
| 64 | * dynamically extended as needed. |
| 65 | */ |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 66 | static Channel **channels = NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 67 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 68 | /* |
| 69 | * 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] | 70 | * initialized (at least the type field); unused slots set to NULL |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 71 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 72 | static int channels_alloc = 0; |
| 73 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 74 | /* |
| 75 | * Maximum file descriptor value used in any of the channels. This is |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 76 | * updated in channel_new. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 77 | */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 78 | static int channel_max_fd = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 79 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 80 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 81 | /* -- tcp forwarding */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 82 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 83 | /* |
| 84 | * Data structure for storing which hosts are permitted for forward requests. |
| 85 | * The local sides of any remote forwards are stored in this array to prevent |
| 86 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local |
| 87 | * network (which might be behind a firewall). |
| 88 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 89 | typedef struct { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 90 | char *host_to_connect; /* Connect to 'host'. */ |
| 91 | u_short port_to_connect; /* Connect to 'port'. */ |
| 92 | u_short listen_port; /* Remote side should listen port number. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 93 | } ForwardPermission; |
| 94 | |
| 95 | /* List of all permitted host/port pairs to connect. */ |
| 96 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 97 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 98 | /* Number of permitted host/port pairs in the array. */ |
| 99 | static int num_permitted_opens = 0; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 100 | /* |
| 101 | * If this is true, all opens are permitted. This is the case on the server |
| 102 | * on which we have to trust the client anyway, and the user could do |
| 103 | * anything after logging in anyway. |
| 104 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 105 | static int all_opens_permitted = 0; |
| 106 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 107 | |
| 108 | /* -- X11 forwarding */ |
| 109 | |
| 110 | /* Maximum number of fake X11 displays to try. */ |
| 111 | #define MAX_DISPLAYS 1000 |
| 112 | |
| 113 | /* Saved X11 authentication protocol name. */ |
| 114 | static char *x11_saved_proto = NULL; |
| 115 | |
| 116 | /* Saved X11 authentication data. This is the real data. */ |
| 117 | static char *x11_saved_data = NULL; |
| 118 | static u_int x11_saved_data_len = 0; |
| 119 | |
| 120 | /* |
| 121 | * Fake X11 authentication data. This is what the server will be sending us; |
| 122 | * we should replace any occurrences of this by the real data. |
| 123 | */ |
| 124 | static char *x11_fake_data = NULL; |
| 125 | static u_int x11_fake_data_len; |
| 126 | |
| 127 | |
| 128 | /* -- agent forwarding */ |
| 129 | |
| 130 | #define NUM_SOCKS 10 |
| 131 | |
| 132 | /* Name and directory of socket for authentication agent forwarding. */ |
| 133 | static char *auth_sock_name = NULL; |
| 134 | static char *auth_sock_dir = NULL; |
| 135 | |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 136 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
Ben Lindstrom | 908afed | 2001-10-03 17:34:59 +0000 | [diff] [blame] | 137 | static int IPv4or6 = AF_UNSPEC; |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 138 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 139 | /* helper */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 140 | static void port_open_helper(Channel *c, char *rtype); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 141 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 142 | /* -- channel core */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 143 | |
| 144 | Channel * |
| 145 | channel_lookup(int id) |
| 146 | { |
| 147 | Channel *c; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 148 | |
Ben Lindstrom | 7954887 | 2002-03-05 01:57:44 +0000 | [diff] [blame] | 149 | if (id < 0 || id >= channels_alloc) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 150 | log("channel_lookup: %d: bad id", id); |
| 151 | return NULL; |
| 152 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 153 | c = channels[id]; |
| 154 | if (c == NULL) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 155 | log("channel_lookup: %d: bad id: channel free", id); |
| 156 | return NULL; |
| 157 | } |
| 158 | return c; |
| 159 | } |
| 160 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 161 | /* |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 162 | * Register filedescriptors for a channel, used when allocating a channel or |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 163 | * when the channel consumer/producer is ready, e.g. shell exec'd |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 164 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 165 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 166 | static void |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 167 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
| 168 | int extusage, int nonblock) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 169 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 170 | /* Update the maximum file descriptor value. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 171 | channel_max_fd = MAX(channel_max_fd, rfd); |
| 172 | channel_max_fd = MAX(channel_max_fd, wfd); |
| 173 | channel_max_fd = MAX(channel_max_fd, efd); |
| 174 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 175 | /* XXX set close-on-exec -markus */ |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 176 | |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 177 | c->rfd = rfd; |
| 178 | c->wfd = wfd; |
| 179 | c->sock = (rfd == wfd) ? rfd : -1; |
| 180 | c->efd = efd; |
| 181 | c->extended_usage = extusage; |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 182 | |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 183 | /* XXX ugly hack: nonblock is only set by the server */ |
| 184 | if (nonblock && isatty(c->rfd)) { |
Ben Lindstrom | cc74df7 | 2001-03-05 06:20:14 +0000 | [diff] [blame] | 185 | debug("channel %d: rfd %d isatty", c->self, c->rfd); |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 186 | c->isatty = 1; |
| 187 | if (!isatty(c->wfd)) { |
Ben Lindstrom | cc74df7 | 2001-03-05 06:20:14 +0000 | [diff] [blame] | 188 | error("channel %d: wfd %d is not a tty?", |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 189 | c->self, c->wfd); |
| 190 | } |
| 191 | } else { |
| 192 | c->isatty = 0; |
| 193 | } |
| 194 | |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 195 | /* enable nonblocking mode */ |
| 196 | if (nonblock) { |
| 197 | if (rfd != -1) |
| 198 | set_nonblock(rfd); |
| 199 | if (wfd != -1) |
| 200 | set_nonblock(wfd); |
| 201 | if (efd != -1) |
| 202 | set_nonblock(efd); |
| 203 | } |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 204 | } |
| 205 | |
| 206 | /* |
| 207 | * Allocate a new channel object and set its type and socket. This will cause |
| 208 | * remote_name to be freed. |
| 209 | */ |
| 210 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 211 | Channel * |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 212 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 213 | int window, int maxpack, int extusage, char *remote_name, int nonblock) |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 214 | { |
| 215 | int i, found; |
| 216 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 217 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 218 | /* Do initial allocation if this is the first call. */ |
| 219 | if (channels_alloc == 0) { |
| 220 | channels_alloc = 10; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 221 | channels = xmalloc(channels_alloc * sizeof(Channel *)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 222 | for (i = 0; i < channels_alloc; i++) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 223 | channels[i] = NULL; |
Ben Lindstrom | 601e436 | 2001-06-21 03:19:23 +0000 | [diff] [blame] | 224 | fatal_add_cleanup((void (*) (void *)) channel_free_all, NULL); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 225 | } |
| 226 | /* Try to find a free slot where to put the new channel. */ |
| 227 | for (found = -1, i = 0; i < channels_alloc; i++) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 228 | if (channels[i] == NULL) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 229 | /* Found a free slot. */ |
| 230 | found = i; |
| 231 | break; |
| 232 | } |
| 233 | if (found == -1) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 234 | /* 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] | 235 | found = channels_alloc; |
| 236 | channels_alloc += 10; |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 237 | debug2("channel: expanding %d", channels_alloc); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 238 | channels = xrealloc(channels, channels_alloc * sizeof(Channel *)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 239 | for (i = found; i < channels_alloc; i++) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 240 | channels[i] = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 241 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 242 | /* Initialize and return new channel. */ |
| 243 | c = channels[found] = xmalloc(sizeof(Channel)); |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 244 | memset(c, 0, sizeof(Channel)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 245 | buffer_init(&c->input); |
| 246 | buffer_init(&c->output); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 247 | buffer_init(&c->extended); |
Damien Miller | 5144df9 | 2002-01-22 23:28:45 +1100 | [diff] [blame] | 248 | c->ostate = CHAN_OUTPUT_OPEN; |
| 249 | c->istate = CHAN_INPUT_OPEN; |
| 250 | c->flags = 0; |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 251 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 252 | c->self = found; |
| 253 | c->type = type; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 254 | c->ctype = ctype; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 255 | c->local_window = window; |
| 256 | c->local_window_max = window; |
| 257 | c->local_consumed = 0; |
| 258 | c->local_maxpacket = maxpack; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 259 | c->remote_id = -1; |
| 260 | c->remote_name = remote_name; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 261 | c->remote_window = 0; |
| 262 | c->remote_maxpacket = 0; |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 263 | c->force_drain = 0; |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 264 | c->single_connection = 0; |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 265 | c->detach_user = NULL; |
Damien Miller | 67f0bc0 | 2002-02-05 12:23:08 +1100 | [diff] [blame] | 266 | c->confirm = NULL; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 267 | c->input_filter = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 268 | debug("channel %d: new [%s]", found, remote_name); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 269 | return c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 270 | } |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 271 | |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 272 | static int |
| 273 | channel_find_maxfd(void) |
| 274 | { |
| 275 | int i, max = 0; |
| 276 | Channel *c; |
| 277 | |
| 278 | for (i = 0; i < channels_alloc; i++) { |
| 279 | c = channels[i]; |
| 280 | if (c != NULL) { |
| 281 | max = MAX(max, c->rfd); |
| 282 | max = MAX(max, c->wfd); |
| 283 | max = MAX(max, c->efd); |
| 284 | } |
| 285 | } |
| 286 | return max; |
| 287 | } |
| 288 | |
| 289 | int |
| 290 | channel_close_fd(int *fdp) |
| 291 | { |
| 292 | int ret = 0, fd = *fdp; |
| 293 | |
| 294 | if (fd != -1) { |
| 295 | ret = close(fd); |
| 296 | *fdp = -1; |
| 297 | if (fd == channel_max_fd) |
| 298 | channel_max_fd = channel_find_maxfd(); |
| 299 | } |
| 300 | return ret; |
| 301 | } |
| 302 | |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 303 | /* Close all channel fd/socket. */ |
| 304 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 305 | static void |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 306 | channel_close_fds(Channel *c) |
| 307 | { |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 308 | debug3("channel_close_fds: channel %d: r %d w %d e %d", |
| 309 | c->self, c->rfd, c->wfd, c->efd); |
| 310 | |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 311 | channel_close_fd(&c->sock); |
| 312 | channel_close_fd(&c->rfd); |
| 313 | channel_close_fd(&c->wfd); |
| 314 | channel_close_fd(&c->efd); |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 315 | } |
| 316 | |
| 317 | /* Free the channel and close its fd/socket. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 318 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 319 | void |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 320 | channel_free(Channel *c) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 321 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 322 | char *s; |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 323 | int i, n; |
| 324 | |
| 325 | for (n = 0, i = 0; i < channels_alloc; i++) |
| 326 | if (channels[i]) |
| 327 | n++; |
Ben Lindstrom | 4c24755 | 2001-06-05 20:56:47 +0000 | [diff] [blame] | 328 | debug("channel_free: channel %d: %s, nchannels %d", c->self, |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 329 | c->remote_name ? c->remote_name : "???", n); |
Ben Lindstrom | 6c3ae2b | 2000-12-30 03:25:14 +0000 | [diff] [blame] | 330 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 331 | s = channel_open_message(); |
Ben Lindstrom | 4c24755 | 2001-06-05 20:56:47 +0000 | [diff] [blame] | 332 | debug3("channel_free: status: %s", s); |
Ben Lindstrom | 6c3ae2b | 2000-12-30 03:25:14 +0000 | [diff] [blame] | 333 | xfree(s); |
| 334 | |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 335 | if (c->sock != -1) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 336 | shutdown(c->sock, SHUT_RDWR); |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 337 | channel_close_fds(c); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 338 | buffer_free(&c->input); |
| 339 | buffer_free(&c->output); |
| 340 | buffer_free(&c->extended); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 341 | if (c->remote_name) { |
| 342 | xfree(c->remote_name); |
| 343 | c->remote_name = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 344 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 345 | channels[c->self] = NULL; |
| 346 | xfree(c); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 347 | } |
| 348 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 349 | void |
Ben Lindstrom | 601e436 | 2001-06-21 03:19:23 +0000 | [diff] [blame] | 350 | channel_free_all(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 351 | { |
| 352 | int i; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 353 | |
Ben Lindstrom | 601e436 | 2001-06-21 03:19:23 +0000 | [diff] [blame] | 354 | for (i = 0; i < channels_alloc; i++) |
| 355 | if (channels[i] != NULL) |
| 356 | channel_free(channels[i]); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 357 | } |
| 358 | |
| 359 | /* |
| 360 | * Closes the sockets/fds of all channels. This is used to close extra file |
| 361 | * descriptors after a fork. |
| 362 | */ |
| 363 | |
| 364 | void |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 365 | channel_close_all(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 366 | { |
| 367 | int i; |
| 368 | |
| 369 | for (i = 0; i < channels_alloc; i++) |
| 370 | if (channels[i] != NULL) |
| 371 | channel_close_fds(channels[i]); |
| 372 | } |
| 373 | |
| 374 | /* |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 375 | * Stop listening to channels. |
| 376 | */ |
| 377 | |
| 378 | void |
| 379 | channel_stop_listening(void) |
| 380 | { |
| 381 | int i; |
| 382 | Channel *c; |
| 383 | |
| 384 | for (i = 0; i < channels_alloc; i++) { |
| 385 | c = channels[i]; |
| 386 | if (c != NULL) { |
| 387 | switch (c->type) { |
| 388 | case SSH_CHANNEL_AUTH_SOCKET: |
| 389 | case SSH_CHANNEL_PORT_LISTENER: |
| 390 | case SSH_CHANNEL_RPORT_LISTENER: |
| 391 | case SSH_CHANNEL_X11_LISTENER: |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 392 | channel_close_fd(&c->sock); |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 393 | channel_free(c); |
| 394 | break; |
| 395 | } |
| 396 | } |
| 397 | } |
| 398 | } |
| 399 | |
| 400 | /* |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 401 | * Returns true if no channel has too much buffered data, and false if one or |
| 402 | * more channel is overfull. |
| 403 | */ |
| 404 | |
| 405 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 406 | channel_not_very_much_buffered_data(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 407 | { |
| 408 | u_int i; |
| 409 | Channel *c; |
| 410 | |
| 411 | for (i = 0; i < channels_alloc; i++) { |
| 412 | c = channels[i]; |
| 413 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 414 | #if 0 |
| 415 | if (!compat20 && |
| 416 | buffer_len(&c->input) > packet_get_maxsize()) { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 417 | debug("channel %d: big input buffer %d", |
| 418 | c->self, buffer_len(&c->input)); |
| 419 | return 0; |
| 420 | } |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 421 | #endif |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 422 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
Damien Miller | af5f2e6 | 2001-10-10 15:01:16 +1000 | [diff] [blame] | 423 | debug("channel %d: big output buffer %d > %d", |
| 424 | c->self, buffer_len(&c->output), |
| 425 | packet_get_maxsize()); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 426 | return 0; |
| 427 | } |
| 428 | } |
| 429 | } |
| 430 | return 1; |
| 431 | } |
| 432 | |
| 433 | /* Returns true if any channel is still open. */ |
| 434 | |
| 435 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 436 | channel_still_open(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 437 | { |
| 438 | int i; |
| 439 | Channel *c; |
| 440 | |
| 441 | for (i = 0; i < channels_alloc; i++) { |
| 442 | c = channels[i]; |
| 443 | if (c == NULL) |
| 444 | continue; |
| 445 | switch (c->type) { |
| 446 | case SSH_CHANNEL_X11_LISTENER: |
| 447 | case SSH_CHANNEL_PORT_LISTENER: |
| 448 | case SSH_CHANNEL_RPORT_LISTENER: |
| 449 | case SSH_CHANNEL_CLOSED: |
| 450 | case SSH_CHANNEL_AUTH_SOCKET: |
| 451 | case SSH_CHANNEL_DYNAMIC: |
| 452 | case SSH_CHANNEL_CONNECTING: |
| 453 | case SSH_CHANNEL_ZOMBIE: |
| 454 | continue; |
| 455 | case SSH_CHANNEL_LARVAL: |
| 456 | if (!compat20) |
| 457 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); |
| 458 | continue; |
| 459 | case SSH_CHANNEL_OPENING: |
| 460 | case SSH_CHANNEL_OPEN: |
| 461 | case SSH_CHANNEL_X11_OPEN: |
| 462 | return 1; |
| 463 | case SSH_CHANNEL_INPUT_DRAINING: |
| 464 | case SSH_CHANNEL_OUTPUT_DRAINING: |
| 465 | if (!compat13) |
| 466 | fatal("cannot happen: OUT_DRAIN"); |
| 467 | return 1; |
| 468 | default: |
| 469 | fatal("channel_still_open: bad channel type %d", c->type); |
| 470 | /* NOTREACHED */ |
| 471 | } |
| 472 | } |
| 473 | return 0; |
| 474 | } |
| 475 | |
| 476 | /* Returns the id of an open channel suitable for keepaliving */ |
| 477 | |
| 478 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 479 | channel_find_open(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 480 | { |
| 481 | int i; |
| 482 | Channel *c; |
| 483 | |
| 484 | for (i = 0; i < channels_alloc; i++) { |
| 485 | c = channels[i]; |
| 486 | if (c == NULL) |
| 487 | continue; |
| 488 | switch (c->type) { |
| 489 | case SSH_CHANNEL_CLOSED: |
| 490 | case SSH_CHANNEL_DYNAMIC: |
| 491 | case SSH_CHANNEL_X11_LISTENER: |
| 492 | case SSH_CHANNEL_PORT_LISTENER: |
| 493 | case SSH_CHANNEL_RPORT_LISTENER: |
| 494 | case SSH_CHANNEL_OPENING: |
| 495 | case SSH_CHANNEL_CONNECTING: |
| 496 | case SSH_CHANNEL_ZOMBIE: |
| 497 | continue; |
| 498 | case SSH_CHANNEL_LARVAL: |
| 499 | case SSH_CHANNEL_AUTH_SOCKET: |
| 500 | case SSH_CHANNEL_OPEN: |
| 501 | case SSH_CHANNEL_X11_OPEN: |
| 502 | return i; |
| 503 | case SSH_CHANNEL_INPUT_DRAINING: |
| 504 | case SSH_CHANNEL_OUTPUT_DRAINING: |
| 505 | if (!compat13) |
| 506 | fatal("cannot happen: OUT_DRAIN"); |
| 507 | return i; |
| 508 | default: |
| 509 | fatal("channel_find_open: bad channel type %d", c->type); |
| 510 | /* NOTREACHED */ |
| 511 | } |
| 512 | } |
| 513 | return -1; |
| 514 | } |
| 515 | |
| 516 | |
| 517 | /* |
| 518 | * Returns a message describing the currently open forwarded connections, |
| 519 | * suitable for sending to the client. The message contains crlf pairs for |
| 520 | * newlines. |
| 521 | */ |
| 522 | |
| 523 | char * |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 524 | channel_open_message(void) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 525 | { |
| 526 | Buffer buffer; |
| 527 | Channel *c; |
| 528 | char buf[1024], *cp; |
| 529 | int i; |
| 530 | |
| 531 | buffer_init(&buffer); |
| 532 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); |
| 533 | buffer_append(&buffer, buf, strlen(buf)); |
| 534 | for (i = 0; i < channels_alloc; i++) { |
| 535 | c = channels[i]; |
| 536 | if (c == NULL) |
| 537 | continue; |
| 538 | switch (c->type) { |
| 539 | case SSH_CHANNEL_X11_LISTENER: |
| 540 | case SSH_CHANNEL_PORT_LISTENER: |
| 541 | case SSH_CHANNEL_RPORT_LISTENER: |
| 542 | case SSH_CHANNEL_CLOSED: |
| 543 | case SSH_CHANNEL_AUTH_SOCKET: |
| 544 | case SSH_CHANNEL_ZOMBIE: |
| 545 | continue; |
| 546 | case SSH_CHANNEL_LARVAL: |
| 547 | case SSH_CHANNEL_OPENING: |
| 548 | case SSH_CHANNEL_CONNECTING: |
| 549 | case SSH_CHANNEL_DYNAMIC: |
| 550 | case SSH_CHANNEL_OPEN: |
| 551 | case SSH_CHANNEL_X11_OPEN: |
| 552 | case SSH_CHANNEL_INPUT_DRAINING: |
| 553 | case SSH_CHANNEL_OUTPUT_DRAINING: |
| 554 | snprintf(buf, sizeof buf, " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n", |
| 555 | c->self, c->remote_name, |
| 556 | c->type, c->remote_id, |
| 557 | c->istate, buffer_len(&c->input), |
| 558 | c->ostate, buffer_len(&c->output), |
| 559 | c->rfd, c->wfd); |
| 560 | buffer_append(&buffer, buf, strlen(buf)); |
| 561 | continue; |
| 562 | default: |
| 563 | fatal("channel_open_message: bad channel type %d", c->type); |
| 564 | /* NOTREACHED */ |
| 565 | } |
| 566 | } |
| 567 | buffer_append(&buffer, "\0", 1); |
| 568 | cp = xstrdup(buffer_ptr(&buffer)); |
| 569 | buffer_free(&buffer); |
| 570 | return cp; |
| 571 | } |
| 572 | |
| 573 | void |
| 574 | channel_send_open(int id) |
| 575 | { |
| 576 | Channel *c = channel_lookup(id); |
| 577 | if (c == NULL) { |
| 578 | log("channel_send_open: %d: bad id", id); |
| 579 | return; |
| 580 | } |
| 581 | debug("send channel open %d", id); |
| 582 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 583 | packet_put_cstring(c->ctype); |
| 584 | packet_put_int(c->self); |
| 585 | packet_put_int(c->local_window); |
| 586 | packet_put_int(c->local_maxpacket); |
| 587 | packet_send(); |
| 588 | } |
| 589 | |
| 590 | void |
Damien Miller | a500cd6 | 2002-02-08 22:04:26 +1100 | [diff] [blame] | 591 | channel_request_start(int local_id, char *service, int wantconfirm) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 592 | { |
Damien Miller | a500cd6 | 2002-02-08 22:04:26 +1100 | [diff] [blame] | 593 | Channel *c = channel_lookup(local_id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 594 | if (c == NULL) { |
Damien Miller | a500cd6 | 2002-02-08 22:04:26 +1100 | [diff] [blame] | 595 | log("channel_request_start: %d: unknown channel id", local_id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 596 | return; |
| 597 | } |
Damien Miller | a500cd6 | 2002-02-08 22:04:26 +1100 | [diff] [blame] | 598 | debug("channel request %d: %s", local_id, service) ; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 599 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
| 600 | packet_put_int(c->remote_id); |
| 601 | packet_put_cstring(service); |
| 602 | packet_put_char(wantconfirm); |
| 603 | } |
| 604 | void |
Damien Miller | 67f0bc0 | 2002-02-05 12:23:08 +1100 | [diff] [blame] | 605 | channel_register_confirm(int id, channel_callback_fn *fn) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 606 | { |
| 607 | Channel *c = channel_lookup(id); |
| 608 | if (c == NULL) { |
Damien Miller | 67f0bc0 | 2002-02-05 12:23:08 +1100 | [diff] [blame] | 609 | log("channel_register_comfirm: %d: bad id", id); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 610 | return; |
| 611 | } |
Damien Miller | 67f0bc0 | 2002-02-05 12:23:08 +1100 | [diff] [blame] | 612 | c->confirm = fn; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 613 | } |
| 614 | void |
| 615 | channel_register_cleanup(int id, channel_callback_fn *fn) |
| 616 | { |
| 617 | Channel *c = channel_lookup(id); |
| 618 | if (c == NULL) { |
| 619 | log("channel_register_cleanup: %d: bad id", id); |
| 620 | return; |
| 621 | } |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 622 | c->detach_user = fn; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 623 | } |
| 624 | void |
| 625 | channel_cancel_cleanup(int id) |
| 626 | { |
| 627 | Channel *c = channel_lookup(id); |
| 628 | if (c == NULL) { |
| 629 | log("channel_cancel_cleanup: %d: bad id", id); |
| 630 | return; |
| 631 | } |
Ben Lindstrom | 809744e | 2001-07-04 05:26:06 +0000 | [diff] [blame] | 632 | c->detach_user = NULL; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 633 | } |
| 634 | void |
| 635 | channel_register_filter(int id, channel_filter_fn *fn) |
| 636 | { |
| 637 | Channel *c = channel_lookup(id); |
| 638 | if (c == NULL) { |
| 639 | log("channel_register_filter: %d: bad id", id); |
| 640 | return; |
| 641 | } |
| 642 | c->input_filter = fn; |
| 643 | } |
| 644 | |
| 645 | void |
| 646 | channel_set_fds(int id, int rfd, int wfd, int efd, |
Damien Miller | 2aa0c19 | 2002-02-19 15:20:08 +1100 | [diff] [blame] | 647 | int extusage, int nonblock, u_int window_max) |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 648 | { |
| 649 | Channel *c = channel_lookup(id); |
| 650 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
| 651 | fatal("channel_activate for non-larval channel %d.", id); |
| 652 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
| 653 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | 2aa0c19 | 2002-02-19 15:20:08 +1100 | [diff] [blame] | 654 | c->local_window = c->local_window_max = window_max; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 655 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
| 656 | packet_put_int(c->remote_id); |
| 657 | packet_put_int(c->local_window); |
| 658 | packet_send(); |
| 659 | } |
| 660 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 661 | /* |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 662 | * 'channel_pre*' are called just before select() to add any bits relevant to |
| 663 | * channels in the select bitmasks. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 664 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 665 | /* |
| 666 | * 'channel_post*': perform any appropriate operations for channels which |
| 667 | * have events pending. |
| 668 | */ |
| 669 | typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset); |
| 670 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
| 671 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; |
| 672 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 673 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 674 | channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 675 | { |
| 676 | FD_SET(c->sock, readset); |
| 677 | } |
| 678 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 679 | static void |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 680 | channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset) |
| 681 | { |
| 682 | debug3("channel %d: waiting for connection", c->self); |
| 683 | FD_SET(c->sock, writeset); |
| 684 | } |
| 685 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 686 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 687 | channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset) |
| 688 | { |
| 689 | if (buffer_len(&c->input) < packet_get_maxsize()) |
| 690 | FD_SET(c->sock, readset); |
| 691 | if (buffer_len(&c->output) > 0) |
| 692 | FD_SET(c->sock, writeset); |
| 693 | } |
| 694 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 695 | static void |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 696 | channel_pre_open(Channel *c, fd_set * readset, fd_set * writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 697 | { |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 698 | u_int limit = compat20 ? c->remote_window : packet_get_maxsize(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 699 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 700 | if (c->istate == CHAN_INPUT_OPEN && |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 701 | limit > 0 && |
| 702 | buffer_len(&c->input) < limit) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 703 | FD_SET(c->rfd, readset); |
| 704 | if (c->ostate == CHAN_OUTPUT_OPEN || |
| 705 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { |
| 706 | if (buffer_len(&c->output) > 0) { |
| 707 | FD_SET(c->wfd, writeset); |
| 708 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 709 | if (CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
| 710 | debug2("channel %d: obuf_empty delayed efd %d/(%d)", |
| 711 | c->self, c->efd, buffer_len(&c->extended)); |
| 712 | else |
| 713 | chan_obuf_empty(c); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 714 | } |
| 715 | } |
| 716 | /** XXX check close conditions, too */ |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 717 | if (compat20 && c->efd != -1) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 718 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
| 719 | buffer_len(&c->extended) > 0) |
| 720 | FD_SET(c->efd, writeset); |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 721 | else if (!(c->flags & CHAN_EOF_SENT) && |
| 722 | c->extended_usage == CHAN_EXTENDED_READ && |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 723 | buffer_len(&c->extended) < c->remote_window) |
| 724 | FD_SET(c->efd, readset); |
| 725 | } |
| 726 | } |
| 727 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 728 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 729 | channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset) |
| 730 | { |
| 731 | if (buffer_len(&c->input) == 0) { |
| 732 | packet_start(SSH_MSG_CHANNEL_CLOSE); |
| 733 | packet_put_int(c->remote_id); |
| 734 | packet_send(); |
| 735 | c->type = SSH_CHANNEL_CLOSED; |
Ben Lindstrom | c486d88 | 2001-04-11 16:08:34 +0000 | [diff] [blame] | 736 | debug("channel %d: closing after input drain.", c->self); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 737 | } |
| 738 | } |
| 739 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 740 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 741 | channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset) |
| 742 | { |
| 743 | if (buffer_len(&c->output) == 0) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 744 | chan_mark_dead(c); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 745 | else |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 746 | FD_SET(c->sock, writeset); |
| 747 | } |
| 748 | |
| 749 | /* |
| 750 | * This is a special state for X11 authentication spoofing. An opened X11 |
| 751 | * connection (when authentication spoofing is being done) remains in this |
| 752 | * state until the first packet has been completely read. The authentication |
| 753 | * data in that packet is then substituted by the real data if it matches the |
| 754 | * fake data, and the channel is put into normal mode. |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 755 | * XXX All this happens at the client side. |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 756 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 757 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 758 | static int |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 759 | x11_open_helper(Buffer *b) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 760 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 761 | u_char *ucp; |
| 762 | u_int proto_len, data_len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 763 | |
| 764 | /* Check if the fixed size part of the packet is in buffer. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 765 | if (buffer_len(b) < 12) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 766 | return 0; |
| 767 | |
| 768 | /* Parse the lengths of variable-length fields. */ |
Damien Miller | 708d21c | 2002-01-22 23:18:15 +1100 | [diff] [blame] | 769 | ucp = buffer_ptr(b); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 770 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
| 771 | proto_len = 256 * ucp[6] + ucp[7]; |
| 772 | data_len = 256 * ucp[8] + ucp[9]; |
| 773 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ |
| 774 | proto_len = ucp[6] + 256 * ucp[7]; |
| 775 | data_len = ucp[8] + 256 * ucp[9]; |
| 776 | } else { |
| 777 | debug("Initial X11 packet contains bad byte order byte: 0x%x", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 778 | ucp[0]); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 779 | return -1; |
| 780 | } |
| 781 | |
| 782 | /* Check if the whole packet is in buffer. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 783 | if (buffer_len(b) < |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 784 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
| 785 | return 0; |
| 786 | |
| 787 | /* Check if authentication protocol matches. */ |
| 788 | if (proto_len != strlen(x11_saved_proto) || |
| 789 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { |
| 790 | debug("X11 connection uses different authentication protocol."); |
| 791 | return -1; |
| 792 | } |
| 793 | /* Check if authentication data matches our fake data. */ |
| 794 | if (data_len != x11_fake_data_len || |
| 795 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), |
| 796 | x11_fake_data, x11_fake_data_len) != 0) { |
| 797 | debug("X11 auth data does not match fake data."); |
| 798 | return -1; |
| 799 | } |
| 800 | /* Check fake data length */ |
| 801 | if (x11_fake_data_len != x11_saved_data_len) { |
| 802 | error("X11 fake_data_len %d != saved_data_len %d", |
| 803 | x11_fake_data_len, x11_saved_data_len); |
| 804 | return -1; |
| 805 | } |
| 806 | /* |
| 807 | * Received authentication protocol and data match |
| 808 | * our fake data. Substitute the fake data with real |
| 809 | * data. |
| 810 | */ |
| 811 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), |
| 812 | x11_saved_data, x11_saved_data_len); |
| 813 | return 1; |
| 814 | } |
| 815 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 816 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 817 | channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset) |
| 818 | { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 819 | int ret = x11_open_helper(&c->output); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 820 | if (ret == 1) { |
| 821 | /* Start normal processing for the channel. */ |
| 822 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 823 | channel_pre_open_13(c, readset, writeset); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 824 | } else if (ret == -1) { |
| 825 | /* |
| 826 | * We have received an X11 connection that has bad |
| 827 | * authentication information. |
| 828 | */ |
Ben Lindstrom | 6df8ef4 | 2001-03-05 07:47:23 +0000 | [diff] [blame] | 829 | log("X11 connection rejected because of wrong authentication."); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 830 | buffer_clear(&c->input); |
| 831 | buffer_clear(&c->output); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 832 | channel_close_fd(&c->sock); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 833 | c->sock = -1; |
| 834 | c->type = SSH_CHANNEL_CLOSED; |
| 835 | packet_start(SSH_MSG_CHANNEL_CLOSE); |
| 836 | packet_put_int(c->remote_id); |
| 837 | packet_send(); |
| 838 | } |
| 839 | } |
| 840 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 841 | static void |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 842 | channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 843 | { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 844 | int ret = x11_open_helper(&c->output); |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 845 | |
| 846 | /* c->force_drain = 1; */ |
| 847 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 848 | if (ret == 1) { |
| 849 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 850 | channel_pre_open(c, readset, writeset); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 851 | } else if (ret == -1) { |
Damien Miller | a90fc08 | 2002-01-22 23:19:38 +1100 | [diff] [blame] | 852 | log("X11 connection rejected because of wrong authentication."); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 853 | 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] | 854 | chan_read_failed(c); |
| 855 | buffer_clear(&c->input); |
| 856 | chan_ibuf_empty(c); |
| 857 | buffer_clear(&c->output); |
| 858 | /* for proto v1, the peer will send an IEOF */ |
| 859 | if (compat20) |
| 860 | chan_write_failed(c); |
| 861 | else |
| 862 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 863 | debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
| 864 | } |
| 865 | } |
| 866 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 867 | /* try to decode a socks4 header */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 868 | static int |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 869 | channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset) |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 870 | { |
| 871 | u_char *p, *host; |
Ben Lindstrom | 2b261b9 | 2001-04-17 18:14:34 +0000 | [diff] [blame] | 872 | int len, have, i, found; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 873 | char username[256]; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 874 | struct { |
| 875 | u_int8_t version; |
| 876 | u_int8_t command; |
| 877 | u_int16_t dest_port; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 878 | struct in_addr dest_addr; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 879 | } s4_req, s4_rsp; |
| 880 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 881 | debug2("channel %d: decode socks4", c->self); |
Ben Lindstrom | 2b261b9 | 2001-04-17 18:14:34 +0000 | [diff] [blame] | 882 | |
| 883 | have = buffer_len(&c->input); |
| 884 | len = sizeof(s4_req); |
| 885 | if (have < len) |
| 886 | return 0; |
| 887 | p = buffer_ptr(&c->input); |
| 888 | for (found = 0, i = len; i < have; i++) { |
| 889 | if (p[i] == '\0') { |
| 890 | found = 1; |
| 891 | break; |
| 892 | } |
| 893 | if (i > 1024) { |
| 894 | /* the peer is probably sending garbage */ |
| 895 | debug("channel %d: decode socks4: too long", |
| 896 | c->self); |
| 897 | return -1; |
| 898 | } |
| 899 | } |
| 900 | if (!found) |
| 901 | return 0; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 902 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
| 903 | buffer_get(&c->input, (char *)&s4_req.command, 1); |
| 904 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 905 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
Ben Lindstrom | 2b261b9 | 2001-04-17 18:14:34 +0000 | [diff] [blame] | 906 | have = buffer_len(&c->input); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 907 | p = buffer_ptr(&c->input); |
| 908 | len = strlen(p); |
Ben Lindstrom | 6fa9d10 | 2001-04-11 23:08:17 +0000 | [diff] [blame] | 909 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 910 | if (len > have) |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 911 | fatal("channel %d: decode socks4: len %d > have %d", |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 912 | c->self, len, have); |
| 913 | strlcpy(username, p, sizeof(username)); |
| 914 | buffer_consume(&c->input, len); |
| 915 | buffer_consume(&c->input, 1); /* trailing '\0' */ |
| 916 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 917 | host = inet_ntoa(s4_req.dest_addr); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 918 | strlcpy(c->path, host, sizeof(c->path)); |
| 919 | c->host_port = ntohs(s4_req.dest_port); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 920 | |
Ben Lindstrom | 6fa9d10 | 2001-04-11 23:08:17 +0000 | [diff] [blame] | 921 | debug("channel %d: dynamic request: socks4 host %s port %u command %u", |
| 922 | c->self, host, c->host_port, s4_req.command); |
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 | if (s4_req.command != 1) { |
| 925 | debug("channel %d: cannot handle: socks4 cn %d", |
| 926 | c->self, s4_req.command); |
| 927 | return -1; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 928 | } |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 929 | s4_rsp.version = 0; /* vn: 0 for reply */ |
| 930 | s4_rsp.command = 90; /* cd: req granted */ |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 931 | s4_rsp.dest_port = 0; /* ignored */ |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 932 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 933 | buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp)); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 934 | return 1; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 935 | } |
| 936 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 937 | /* dynamic port forwarding */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 938 | static void |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 939 | channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset) |
| 940 | { |
| 941 | u_char *p; |
| 942 | int have, ret; |
| 943 | |
| 944 | have = buffer_len(&c->input); |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 945 | c->delayed = 0; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 946 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
Ben Lindstrom | c486d88 | 2001-04-11 16:08:34 +0000 | [diff] [blame] | 947 | /* buffer_dump(&c->input); */ |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 948 | /* check if the fixed size part of the packet is in buffer. */ |
| 949 | if (have < 4) { |
| 950 | /* need more */ |
| 951 | FD_SET(c->sock, readset); |
| 952 | return; |
| 953 | } |
| 954 | /* try to guess the protocol */ |
| 955 | p = buffer_ptr(&c->input); |
| 956 | switch (p[0]) { |
Ben Lindstrom | 6fa9d10 | 2001-04-11 23:08:17 +0000 | [diff] [blame] | 957 | case 0x04: |
| 958 | ret = channel_decode_socks4(c, readset, writeset); |
| 959 | break; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 960 | default: |
| 961 | ret = -1; |
| 962 | break; |
| 963 | } |
| 964 | if (ret < 0) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 965 | chan_mark_dead(c); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 966 | } else if (ret == 0) { |
| 967 | debug2("channel %d: pre_dynamic: need more", c->self); |
| 968 | /* need more */ |
| 969 | FD_SET(c->sock, readset); |
| 970 | } else { |
| 971 | /* switch to the next state */ |
| 972 | c->type = SSH_CHANNEL_OPENING; |
| 973 | port_open_helper(c, "direct-tcpip"); |
| 974 | } |
| 975 | } |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 976 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 977 | /* This is our fake X11 server socket. */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 978 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 979 | channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 980 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 981 | Channel *nc; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 982 | struct sockaddr addr; |
Damien Miller | 398e1cf | 2002-02-05 11:52:13 +1100 | [diff] [blame] | 983 | int newsock; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 984 | socklen_t addrlen; |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 985 | char buf[16384], *remote_ipaddr; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 986 | int remote_port; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 987 | |
| 988 | if (FD_ISSET(c->sock, readset)) { |
| 989 | debug("X11 connection requested."); |
| 990 | addrlen = sizeof(addr); |
| 991 | newsock = accept(c->sock, &addr, &addrlen); |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 992 | if (c->single_connection) { |
| 993 | debug("single_connection: closing X11 listener."); |
| 994 | channel_close_fd(&c->sock); |
| 995 | chan_mark_dead(c); |
| 996 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 997 | if (newsock < 0) { |
| 998 | error("accept: %.100s", strerror(errno)); |
| 999 | return; |
| 1000 | } |
Damien Miller | 398e1cf | 2002-02-05 11:52:13 +1100 | [diff] [blame] | 1001 | set_nodelay(newsock); |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1002 | remote_ipaddr = get_peer_ipaddr(newsock); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1003 | remote_port = get_peer_port(newsock); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1004 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1005 | remote_ipaddr, remote_port); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1006 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1007 | nc = channel_new("accepted x11 socket", |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1008 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
| 1009 | c->local_window_max, c->local_maxpacket, |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 1010 | 0, xstrdup(buf), 1); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1011 | if (compat20) { |
| 1012 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 1013 | packet_put_cstring("x11"); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1014 | packet_put_int(nc->self); |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 1015 | packet_put_int(nc->local_window_max); |
| 1016 | packet_put_int(nc->local_maxpacket); |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1017 | /* originator ipaddr and port */ |
| 1018 | packet_put_cstring(remote_ipaddr); |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 1019 | if (datafellows & SSH_BUG_X11FWD) { |
| 1020 | debug("ssh2 x11 bug compat mode"); |
| 1021 | } else { |
| 1022 | packet_put_int(remote_port); |
| 1023 | } |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1024 | packet_send(); |
| 1025 | } else { |
| 1026 | packet_start(SSH_SMSG_X11_OPEN); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1027 | packet_put_int(nc->self); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1028 | if (packet_get_protocol_flags() & |
| 1029 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) |
Ben Lindstrom | 664408d | 2001-06-09 01:42:01 +0000 | [diff] [blame] | 1030 | packet_put_cstring(buf); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1031 | packet_send(); |
| 1032 | } |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1033 | xfree(remote_ipaddr); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1034 | } |
| 1035 | } |
| 1036 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1037 | static void |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1038 | port_open_helper(Channel *c, char *rtype) |
| 1039 | { |
| 1040 | int direct; |
| 1041 | char buf[1024]; |
| 1042 | char *remote_ipaddr = get_peer_ipaddr(c->sock); |
| 1043 | u_short remote_port = get_peer_port(c->sock); |
| 1044 | |
| 1045 | direct = (strcmp(rtype, "direct-tcpip") == 0); |
| 1046 | |
| 1047 | snprintf(buf, sizeof buf, |
| 1048 | "%s: listening port %d for %.100s port %d, " |
| 1049 | "connect from %.200s port %d", |
| 1050 | rtype, c->listening_port, c->path, c->host_port, |
| 1051 | remote_ipaddr, remote_port); |
| 1052 | |
| 1053 | xfree(c->remote_name); |
| 1054 | c->remote_name = xstrdup(buf); |
| 1055 | |
| 1056 | if (compat20) { |
| 1057 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 1058 | packet_put_cstring(rtype); |
| 1059 | packet_put_int(c->self); |
| 1060 | packet_put_int(c->local_window_max); |
| 1061 | packet_put_int(c->local_maxpacket); |
| 1062 | if (direct) { |
| 1063 | /* target host, port */ |
| 1064 | packet_put_cstring(c->path); |
| 1065 | packet_put_int(c->host_port); |
| 1066 | } else { |
| 1067 | /* listen address, port */ |
| 1068 | packet_put_cstring(c->path); |
| 1069 | packet_put_int(c->listening_port); |
| 1070 | } |
| 1071 | /* originator host and port */ |
| 1072 | packet_put_cstring(remote_ipaddr); |
| 1073 | packet_put_int(remote_port); |
| 1074 | packet_send(); |
| 1075 | } else { |
| 1076 | packet_start(SSH_MSG_PORT_OPEN); |
| 1077 | packet_put_int(c->self); |
| 1078 | packet_put_cstring(c->path); |
| 1079 | packet_put_int(c->host_port); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1080 | if (packet_get_protocol_flags() & |
| 1081 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1082 | packet_put_cstring(c->remote_name); |
| 1083 | packet_send(); |
| 1084 | } |
| 1085 | xfree(remote_ipaddr); |
| 1086 | } |
| 1087 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1088 | /* |
| 1089 | * This socket is listening for connections to a forwarded TCP/IP port. |
| 1090 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1091 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1092 | channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 1093 | { |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1094 | Channel *nc; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1095 | struct sockaddr addr; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1096 | int newsock, nextstate; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1097 | socklen_t addrlen; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1098 | char *rtype; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1099 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1100 | if (FD_ISSET(c->sock, readset)) { |
| 1101 | debug("Connection to port %d forwarding " |
| 1102 | "to %.100s port %d requested.", |
| 1103 | c->listening_port, c->path, c->host_port); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1104 | |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1105 | if (c->type == SSH_CHANNEL_RPORT_LISTENER) { |
| 1106 | nextstate = SSH_CHANNEL_OPENING; |
| 1107 | rtype = "forwarded-tcpip"; |
| 1108 | } else { |
| 1109 | if (c->host_port == 0) { |
| 1110 | nextstate = SSH_CHANNEL_DYNAMIC; |
Damien Miller | d3c04b9 | 2001-10-10 15:04:20 +1000 | [diff] [blame] | 1111 | rtype = "dynamic-tcpip"; |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1112 | } else { |
| 1113 | nextstate = SSH_CHANNEL_OPENING; |
| 1114 | rtype = "direct-tcpip"; |
| 1115 | } |
| 1116 | } |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1117 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1118 | addrlen = sizeof(addr); |
| 1119 | newsock = accept(c->sock, &addr, &addrlen); |
| 1120 | if (newsock < 0) { |
| 1121 | error("accept: %.100s", strerror(errno)); |
| 1122 | return; |
| 1123 | } |
Ben Lindstrom | 1ebd7a5 | 2002-02-26 18:12:51 +0000 | [diff] [blame] | 1124 | set_nodelay(newsock); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1125 | nc = channel_new(rtype, |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1126 | nextstate, newsock, newsock, -1, |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1127 | c->local_window_max, c->local_maxpacket, |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1128 | 0, xstrdup(rtype), 1); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1129 | nc->listening_port = c->listening_port; |
| 1130 | nc->host_port = c->host_port; |
| 1131 | strlcpy(nc->path, c->path, sizeof(nc->path)); |
| 1132 | |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1133 | if (nextstate == SSH_CHANNEL_DYNAMIC) { |
| 1134 | /* |
| 1135 | * do not call the channel_post handler until |
| 1136 | * this flag has been reset by a pre-handler. |
| 1137 | * otherwise the FD_ISSET calls might overflow |
| 1138 | */ |
| 1139 | nc->delayed = 1; |
| 1140 | } else { |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1141 | port_open_helper(nc, rtype); |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1142 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1143 | } |
| 1144 | } |
| 1145 | |
| 1146 | /* |
| 1147 | * This is the authentication agent socket listening for connections from |
| 1148 | * clients. |
| 1149 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1150 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1151 | channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 1152 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1153 | Channel *nc; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1154 | char *name; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1155 | int newsock; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1156 | struct sockaddr addr; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1157 | socklen_t addrlen; |
| 1158 | |
| 1159 | if (FD_ISSET(c->sock, readset)) { |
| 1160 | addrlen = sizeof(addr); |
| 1161 | newsock = accept(c->sock, &addr, &addrlen); |
| 1162 | if (newsock < 0) { |
| 1163 | error("accept from auth socket: %.100s", strerror(errno)); |
| 1164 | return; |
| 1165 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1166 | name = xstrdup("accepted auth socket"); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1167 | nc = channel_new("accepted auth socket", |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1168 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
| 1169 | c->local_window_max, c->local_maxpacket, |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1170 | 0, name, 1); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1171 | if (compat20) { |
| 1172 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 1173 | packet_put_cstring("auth-agent@openssh.com"); |
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 | packet_put_int(c->local_window_max); |
| 1176 | packet_put_int(c->local_maxpacket); |
| 1177 | } else { |
| 1178 | packet_start(SSH_SMSG_AGENT_OPEN); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1179 | packet_put_int(nc->self); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1180 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1181 | packet_send(); |
| 1182 | } |
| 1183 | } |
| 1184 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1185 | static void |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1186 | channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset) |
| 1187 | { |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1188 | int err = 0; |
Ben Lindstrom | 1118095 | 2001-07-04 05:13:35 +0000 | [diff] [blame] | 1189 | socklen_t sz = sizeof(err); |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1190 | |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1191 | if (FD_ISSET(c->sock, writeset)) { |
Ben Lindstrom | 733a235 | 2002-03-05 01:31:28 +0000 | [diff] [blame] | 1192 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) { |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1193 | err = errno; |
| 1194 | error("getsockopt SO_ERROR failed"); |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1195 | } |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1196 | if (err == 0) { |
| 1197 | debug("channel %d: connected", c->self); |
| 1198 | c->type = SSH_CHANNEL_OPEN; |
| 1199 | if (compat20) { |
| 1200 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1201 | packet_put_int(c->remote_id); |
| 1202 | packet_put_int(c->self); |
| 1203 | packet_put_int(c->local_window); |
| 1204 | packet_put_int(c->local_maxpacket); |
| 1205 | } else { |
| 1206 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1207 | packet_put_int(c->remote_id); |
| 1208 | packet_put_int(c->self); |
| 1209 | } |
| 1210 | } else { |
| 1211 | debug("channel %d: not connected: %s", |
| 1212 | c->self, strerror(err)); |
| 1213 | if (compat20) { |
| 1214 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); |
| 1215 | packet_put_int(c->remote_id); |
| 1216 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); |
| 1217 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
| 1218 | packet_put_cstring(strerror(err)); |
| 1219 | packet_put_cstring(""); |
| 1220 | } |
| 1221 | } else { |
| 1222 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 1223 | packet_put_int(c->remote_id); |
| 1224 | } |
| 1225 | chan_mark_dead(c); |
| 1226 | } |
| 1227 | packet_send(); |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1228 | } |
| 1229 | } |
| 1230 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1231 | static int |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1232 | channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset) |
| 1233 | { |
| 1234 | char buf[16*1024]; |
| 1235 | int len; |
| 1236 | |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 1237 | if (c->rfd != -1 && |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1238 | FD_ISSET(c->rfd, readset)) { |
| 1239 | len = read(c->rfd, buf, sizeof(buf)); |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 1240 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
| 1241 | return 1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1242 | if (len <= 0) { |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1243 | debug("channel %d: read<=0 rfd %d len %d", |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1244 | c->self, c->rfd, len); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1245 | if (c->type != SSH_CHANNEL_OPEN) { |
| 1246 | debug("channel %d: not open", c->self); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1247 | chan_mark_dead(c); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1248 | return -1; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1249 | } else if (compat13) { |
Damien Miller | 76765c0 | 2002-01-22 23:21:15 +1100 | [diff] [blame] | 1250 | buffer_clear(&c->output); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1251 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1252 | debug("channel %d: input draining.", c->self); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1253 | } else { |
| 1254 | chan_read_failed(c); |
| 1255 | } |
| 1256 | return -1; |
| 1257 | } |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1258 | if (c->input_filter != NULL) { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1259 | if (c->input_filter(c, buf, len) == -1) { |
Ben Lindstrom | c486d88 | 2001-04-11 16:08:34 +0000 | [diff] [blame] | 1260 | debug("channel %d: filter stops", c->self); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1261 | chan_read_failed(c); |
| 1262 | } |
| 1263 | } else { |
| 1264 | buffer_append(&c->input, buf, len); |
| 1265 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1266 | } |
| 1267 | return 1; |
| 1268 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1269 | static int |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1270 | channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset) |
| 1271 | { |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 1272 | struct termios tio; |
Ben Lindstrom | 6d218f4 | 2001-09-18 05:53:12 +0000 | [diff] [blame] | 1273 | u_char *data; |
| 1274 | u_int dlen; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1275 | int len; |
| 1276 | |
| 1277 | /* Send buffered output data to the socket. */ |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 1278 | if (c->wfd != -1 && |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1279 | FD_ISSET(c->wfd, writeset) && |
| 1280 | buffer_len(&c->output) > 0) { |
Ben Lindstrom | 6d218f4 | 2001-09-18 05:53:12 +0000 | [diff] [blame] | 1281 | data = buffer_ptr(&c->output); |
| 1282 | dlen = buffer_len(&c->output); |
| 1283 | len = write(c->wfd, data, dlen); |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 1284 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
| 1285 | return 1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1286 | if (len <= 0) { |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1287 | if (c->type != SSH_CHANNEL_OPEN) { |
| 1288 | debug("channel %d: not open", c->self); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1289 | chan_mark_dead(c); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1290 | return -1; |
| 1291 | } else if (compat13) { |
Damien Miller | 76765c0 | 2002-01-22 23:21:15 +1100 | [diff] [blame] | 1292 | buffer_clear(&c->output); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1293 | debug("channel %d: input draining.", c->self); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1294 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
| 1295 | } else { |
| 1296 | chan_write_failed(c); |
| 1297 | } |
| 1298 | return -1; |
| 1299 | } |
Ben Lindstrom | 6d218f4 | 2001-09-18 05:53:12 +0000 | [diff] [blame] | 1300 | if (compat20 && c->isatty && dlen >= 1 && data[0] != '\r') { |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1301 | if (tcgetattr(c->wfd, &tio) == 0 && |
| 1302 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { |
| 1303 | /* |
| 1304 | * Simulate echo to reduce the impact of |
Ben Lindstrom | b40204b | 2001-03-05 06:29:44 +0000 | [diff] [blame] | 1305 | * traffic analysis. We need to match the |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 1306 | * size of a SSH2_MSG_CHANNEL_DATA message |
| 1307 | * (4 byte channel id + data) |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1308 | */ |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 1309 | packet_send_ignore(4 + len); |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1310 | packet_send(); |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1311 | } |
| 1312 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1313 | buffer_consume(&c->output, len); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1314 | if (compat20 && len > 0) { |
| 1315 | c->local_consumed += len; |
| 1316 | } |
| 1317 | } |
| 1318 | return 1; |
| 1319 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1320 | static int |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1321 | channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset) |
| 1322 | { |
| 1323 | char buf[16*1024]; |
| 1324 | int len; |
| 1325 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1326 | /** XXX handle drain efd, too */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1327 | if (c->efd != -1) { |
| 1328 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
| 1329 | FD_ISSET(c->efd, writeset) && |
| 1330 | buffer_len(&c->extended) > 0) { |
| 1331 | len = write(c->efd, buffer_ptr(&c->extended), |
| 1332 | buffer_len(&c->extended)); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1333 | debug2("channel %d: written %d to efd %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1334 | c->self, len, c->efd); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1335 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
| 1336 | return 1; |
| 1337 | if (len <= 0) { |
| 1338 | debug2("channel %d: closing write-efd %d", |
| 1339 | c->self, c->efd); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 1340 | channel_close_fd(&c->efd); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1341 | } else { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1342 | buffer_consume(&c->extended, len); |
| 1343 | c->local_consumed += len; |
| 1344 | } |
| 1345 | } else if (c->extended_usage == CHAN_EXTENDED_READ && |
| 1346 | FD_ISSET(c->efd, readset)) { |
| 1347 | len = read(c->efd, buf, sizeof(buf)); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1348 | debug2("channel %d: read %d from efd %d", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1349 | c->self, len, c->efd); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1350 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
| 1351 | return 1; |
| 1352 | if (len <= 0) { |
| 1353 | debug2("channel %d: closing read-efd %d", |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1354 | c->self, c->efd); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 1355 | channel_close_fd(&c->efd); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1356 | } else { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1357 | buffer_append(&c->extended, buf, len); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1358 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1359 | } |
| 1360 | } |
| 1361 | return 1; |
| 1362 | } |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1363 | static int |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1364 | channel_check_window(Channel *c) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1365 | { |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1366 | if (c->type == SSH_CHANNEL_OPEN && |
| 1367 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1368 | c->local_window < c->local_window_max/2 && |
| 1369 | c->local_consumed > 0) { |
| 1370 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
| 1371 | packet_put_int(c->remote_id); |
| 1372 | packet_put_int(c->local_consumed); |
| 1373 | packet_send(); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1374 | debug2("channel %d: window %d sent adjust %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1375 | c->self, c->local_window, |
| 1376 | c->local_consumed); |
| 1377 | c->local_window += c->local_consumed; |
| 1378 | c->local_consumed = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1379 | } |
| 1380 | return 1; |
| 1381 | } |
| 1382 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1383 | static void |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1384 | channel_post_open(Channel *c, fd_set * readset, fd_set * writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1385 | { |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1386 | if (c->delayed) |
| 1387 | return; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1388 | channel_handle_rfd(c, readset, writeset); |
| 1389 | channel_handle_wfd(c, readset, writeset); |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1390 | if (!compat20) |
Damien Miller | 4623a75 | 2001-10-10 15:03:58 +1000 | [diff] [blame] | 1391 | return; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1392 | channel_handle_efd(c, readset, writeset); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1393 | channel_check_window(c); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1394 | } |
| 1395 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1396 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1397 | channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset) |
| 1398 | { |
| 1399 | int len; |
| 1400 | /* Send buffered output data to the socket. */ |
| 1401 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { |
| 1402 | len = write(c->sock, buffer_ptr(&c->output), |
| 1403 | buffer_len(&c->output)); |
| 1404 | if (len <= 0) |
Damien Miller | 76765c0 | 2002-01-22 23:21:15 +1100 | [diff] [blame] | 1405 | buffer_clear(&c->output); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1406 | else |
| 1407 | buffer_consume(&c->output, len); |
| 1408 | } |
| 1409 | } |
| 1410 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1411 | static void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1412 | channel_handler_init_20(void) |
| 1413 | { |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1414 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1415 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1416 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1417 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1418 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1419 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1420 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1421 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1422 | |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1423 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1424 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1425 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1426 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1427 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1428 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1429 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1430 | } |
| 1431 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1432 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1433 | channel_handler_init_13(void) |
| 1434 | { |
| 1435 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; |
| 1436 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; |
| 1437 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
| 1438 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
| 1439 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
| 1440 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; |
| 1441 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1442 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1443 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1444 | |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1445 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1446 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
| 1447 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
| 1448 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
| 1449 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1450 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1451 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1452 | } |
| 1453 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1454 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1455 | channel_handler_init_15(void) |
| 1456 | { |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1457 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1458 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1459 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
| 1460 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
| 1461 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1462 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1463 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1464 | |
| 1465 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
| 1466 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
| 1467 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1468 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1469 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
Damien Miller | de6987c | 2002-01-22 23:20:40 +1100 | [diff] [blame] | 1470 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1471 | } |
| 1472 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1473 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1474 | channel_handler_init(void) |
| 1475 | { |
| 1476 | int i; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1477 | for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1478 | channel_pre[i] = NULL; |
| 1479 | channel_post[i] = NULL; |
| 1480 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1481 | if (compat20) |
| 1482 | channel_handler_init_20(); |
| 1483 | else if (compat13) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1484 | channel_handler_init_13(); |
| 1485 | else |
| 1486 | channel_handler_init_15(); |
| 1487 | } |
| 1488 | |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 1489 | /* gc dead channels */ |
| 1490 | static void |
| 1491 | channel_garbage_collect(Channel *c) |
| 1492 | { |
| 1493 | if (c == NULL) |
| 1494 | return; |
| 1495 | if (c->detach_user != NULL) { |
| 1496 | if (!chan_is_dead(c, 0)) |
| 1497 | return; |
| 1498 | debug("channel %d: gc: notify user", c->self); |
| 1499 | c->detach_user(c->self, NULL); |
| 1500 | /* if we still have a callback */ |
| 1501 | if (c->detach_user != NULL) |
| 1502 | return; |
| 1503 | debug("channel %d: gc: user detached", c->self); |
| 1504 | } |
| 1505 | if (!chan_is_dead(c, 1)) |
| 1506 | return; |
| 1507 | debug("channel %d: garbage collecting", c->self); |
| 1508 | channel_free(c); |
| 1509 | } |
| 1510 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1511 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1512 | channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset) |
| 1513 | { |
| 1514 | static int did_init = 0; |
| 1515 | int i; |
| 1516 | Channel *c; |
| 1517 | |
| 1518 | if (!did_init) { |
| 1519 | channel_handler_init(); |
| 1520 | did_init = 1; |
| 1521 | } |
| 1522 | for (i = 0; i < channels_alloc; i++) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1523 | c = channels[i]; |
| 1524 | if (c == NULL) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1525 | continue; |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 1526 | if (ftab[c->type] != NULL) |
| 1527 | (*ftab[c->type])(c, readset, writeset); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 1528 | channel_garbage_collect(c); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1529 | } |
| 1530 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1531 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1532 | /* |
| 1533 | * Allocate/update select bitmasks and add any bits relevant to channels in |
| 1534 | * select bitmasks. |
| 1535 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1536 | void |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 1537 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 1538 | int *nallocp, int rekeying) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1539 | { |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1540 | int n; |
| 1541 | u_int sz; |
| 1542 | |
| 1543 | n = MAX(*maxfdp, channel_max_fd); |
| 1544 | |
| 1545 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 1546 | /* perhaps check sz < nalloc/2 and shrink? */ |
| 1547 | if (*readsetp == NULL || sz > *nallocp) { |
| 1548 | *readsetp = xrealloc(*readsetp, sz); |
| 1549 | *writesetp = xrealloc(*writesetp, sz); |
| 1550 | *nallocp = sz; |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1551 | } |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 1552 | *maxfdp = n; |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1553 | memset(*readsetp, 0, sz); |
| 1554 | memset(*writesetp, 0, sz); |
| 1555 | |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 1556 | if (!rekeying) |
| 1557 | channel_handler(channel_pre, *readsetp, *writesetp); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1558 | } |
| 1559 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1560 | /* |
| 1561 | * After select, perform any appropriate operations for channels which have |
| 1562 | * events pending. |
| 1563 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1564 | void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1565 | channel_after_select(fd_set * readset, fd_set * writeset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1566 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1567 | channel_handler(channel_post, readset, writeset); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1568 | } |
| 1569 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1570 | |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1571 | /* 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] | 1572 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1573 | void |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 1574 | channel_output_poll(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1575 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1576 | int len, i; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1577 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1578 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1579 | for (i = 0; i < channels_alloc; i++) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1580 | c = channels[i]; |
| 1581 | if (c == NULL) |
| 1582 | continue; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1583 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1584 | /* |
| 1585 | * We are only interested in channels that can have buffered |
| 1586 | * incoming data. |
| 1587 | */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1588 | if (compat13) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1589 | if (c->type != SSH_CHANNEL_OPEN && |
| 1590 | c->type != SSH_CHANNEL_INPUT_DRAINING) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1591 | continue; |
| 1592 | } else { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1593 | if (c->type != SSH_CHANNEL_OPEN) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1594 | continue; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1595 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1596 | if (compat20 && |
| 1597 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1598 | /* XXX is this true? */ |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 1599 | debug3("channel %d: will not send data after close", c->self); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1600 | continue; |
| 1601 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1602 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1603 | /* Get the amount of buffered data for this channel. */ |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1604 | if ((c->istate == CHAN_INPUT_OPEN || |
| 1605 | c->istate == CHAN_INPUT_WAIT_DRAIN) && |
| 1606 | (len = buffer_len(&c->input)) > 0) { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1607 | /* |
| 1608 | * Send some data for the other side over the secure |
| 1609 | * connection. |
| 1610 | */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1611 | if (compat20) { |
| 1612 | if (len > c->remote_window) |
| 1613 | len = c->remote_window; |
| 1614 | if (len > c->remote_maxpacket) |
| 1615 | len = c->remote_maxpacket; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1616 | } else { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1617 | if (packet_is_interactive()) { |
| 1618 | if (len > 1024) |
| 1619 | len = 512; |
| 1620 | } else { |
| 1621 | /* Keep the packets at reasonable size. */ |
| 1622 | if (len > packet_get_maxsize()/2) |
| 1623 | len = packet_get_maxsize()/2; |
| 1624 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1625 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1626 | if (len > 0) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1627 | packet_start(compat20 ? |
| 1628 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1629 | packet_put_int(c->remote_id); |
| 1630 | packet_put_string(buffer_ptr(&c->input), len); |
| 1631 | packet_send(); |
| 1632 | buffer_consume(&c->input, len); |
| 1633 | c->remote_window -= len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1634 | } |
| 1635 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1636 | if (compat13) |
| 1637 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1638 | /* |
| 1639 | * input-buffer is empty and read-socket shutdown: |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 1640 | * tell peer, that we will not send more data: send IEOF. |
| 1641 | * hack for extended data: delay EOF if EFD still in use. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1642 | */ |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 1643 | if (CHANNEL_EFD_INPUT_ACTIVE(c)) |
| 1644 | debug2("channel %d: ibuf_empty delayed efd %d/(%d)", |
| 1645 | c->self, c->efd, buffer_len(&c->extended)); |
| 1646 | else |
| 1647 | chan_ibuf_empty(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1648 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1649 | /* Send extended data, i.e. stderr */ |
| 1650 | if (compat20 && |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 1651 | !(c->flags & CHAN_EOF_SENT) && |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1652 | c->remote_window > 0 && |
| 1653 | (len = buffer_len(&c->extended)) > 0 && |
| 1654 | c->extended_usage == CHAN_EXTENDED_READ) { |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1655 | debug2("channel %d: rwin %d elen %d euse %d", |
| 1656 | c->self, c->remote_window, buffer_len(&c->extended), |
| 1657 | c->extended_usage); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1658 | if (len > c->remote_window) |
| 1659 | len = c->remote_window; |
| 1660 | if (len > c->remote_maxpacket) |
| 1661 | len = c->remote_maxpacket; |
| 1662 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); |
| 1663 | packet_put_int(c->remote_id); |
| 1664 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); |
| 1665 | packet_put_string(buffer_ptr(&c->extended), len); |
| 1666 | packet_send(); |
| 1667 | buffer_consume(&c->extended, len); |
| 1668 | c->remote_window -= len; |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1669 | debug2("channel %d: sent ext data %d", c->self, len); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1670 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1671 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1672 | } |
| 1673 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1674 | |
| 1675 | /* -- protocol input */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1676 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1677 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1678 | channel_input_data(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1679 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1680 | int id; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1681 | char *data; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1682 | u_int data_len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1683 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1684 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1685 | /* Get the channel number and verify it. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1686 | id = packet_get_int(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1687 | c = channel_lookup(id); |
| 1688 | if (c == NULL) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1689 | packet_disconnect("Received data for nonexistent channel %d.", id); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1690 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1691 | /* Ignore any data for non-open channels (might happen on close) */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1692 | if (c->type != SSH_CHANNEL_OPEN && |
| 1693 | c->type != SSH_CHANNEL_X11_OPEN) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1694 | return; |
| 1695 | |
| 1696 | /* same for protocol 1.5 if output end is no longer open */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1697 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1698 | return; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1699 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1700 | /* Get the data. */ |
| 1701 | data = packet_get_string(&data_len); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1702 | |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1703 | if (compat20) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1704 | if (data_len > c->local_maxpacket) { |
| 1705 | log("channel %d: rcvd big packet %d, maxpack %d", |
| 1706 | c->self, data_len, c->local_maxpacket); |
| 1707 | } |
| 1708 | if (data_len > c->local_window) { |
| 1709 | log("channel %d: rcvd too much data %d, win %d", |
| 1710 | c->self, data_len, c->local_window); |
| 1711 | xfree(data); |
| 1712 | return; |
| 1713 | } |
| 1714 | c->local_window -= data_len; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1715 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1716 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1717 | buffer_append(&c->output, data, data_len); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1718 | xfree(data); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1719 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1720 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1721 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1722 | channel_input_extended_data(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1723 | { |
| 1724 | int id; |
| 1725 | int tcode; |
| 1726 | char *data; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1727 | u_int data_len; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1728 | Channel *c; |
| 1729 | |
| 1730 | /* Get the channel number and verify it. */ |
| 1731 | id = packet_get_int(); |
| 1732 | c = channel_lookup(id); |
| 1733 | |
| 1734 | if (c == NULL) |
| 1735 | packet_disconnect("Received extended_data for bad channel %d.", id); |
| 1736 | if (c->type != SSH_CHANNEL_OPEN) { |
| 1737 | log("channel %d: ext data for non open", id); |
| 1738 | return; |
| 1739 | } |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 1740 | if (c->flags & CHAN_EOF_RCVD) { |
| 1741 | if (datafellows & SSH_BUG_EXTEOF) |
| 1742 | debug("channel %d: accepting ext data after eof", id); |
| 1743 | else |
| 1744 | packet_disconnect("Received extended_data after EOF " |
| 1745 | "on channel %d.", id); |
| 1746 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1747 | tcode = packet_get_int(); |
| 1748 | if (c->efd == -1 || |
| 1749 | c->extended_usage != CHAN_EXTENDED_WRITE || |
| 1750 | tcode != SSH2_EXTENDED_DATA_STDERR) { |
| 1751 | log("channel %d: bad ext data", c->self); |
| 1752 | return; |
| 1753 | } |
| 1754 | data = packet_get_string(&data_len); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1755 | packet_check_eom(); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1756 | if (data_len > c->local_window) { |
| 1757 | log("channel %d: rcvd too much extended_data %d, win %d", |
| 1758 | c->self, data_len, c->local_window); |
| 1759 | xfree(data); |
| 1760 | return; |
| 1761 | } |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1762 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1763 | c->local_window -= data_len; |
| 1764 | buffer_append(&c->extended, data, data_len); |
| 1765 | xfree(data); |
| 1766 | } |
| 1767 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1768 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1769 | channel_input_ieof(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1770 | { |
| 1771 | int id; |
| 1772 | Channel *c; |
| 1773 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1774 | id = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1775 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1776 | c = channel_lookup(id); |
| 1777 | if (c == NULL) |
| 1778 | packet_disconnect("Received ieof for nonexistent channel %d.", id); |
| 1779 | chan_rcvd_ieof(c); |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 1780 | |
| 1781 | /* XXX force input close */ |
Damien Miller | a90fc08 | 2002-01-22 23:19:38 +1100 | [diff] [blame] | 1782 | if (c->force_drain && c->istate == CHAN_INPUT_OPEN) { |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 1783 | debug("channel %d: FORCE input drain", c->self); |
| 1784 | c->istate = CHAN_INPUT_WAIT_DRAIN; |
Damien Miller | 73f1074 | 2002-01-22 23:34:52 +1100 | [diff] [blame] | 1785 | if (buffer_len(&c->input) == 0) |
| 1786 | chan_ibuf_empty(c); |
Ben Lindstrom | 944c4f0 | 2001-09-18 05:51:13 +0000 | [diff] [blame] | 1787 | } |
| 1788 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1789 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1790 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1791 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1792 | channel_input_close(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1793 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1794 | int id; |
| 1795 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1796 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1797 | id = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1798 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1799 | c = channel_lookup(id); |
| 1800 | if (c == NULL) |
| 1801 | packet_disconnect("Received close for nonexistent channel %d.", id); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1802 | |
| 1803 | /* |
| 1804 | * Send a confirmation that we have closed the channel and no more |
| 1805 | * data is coming for it. |
| 1806 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1807 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1808 | packet_put_int(c->remote_id); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1809 | packet_send(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1810 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1811 | /* |
| 1812 | * If the channel is in closed state, we have sent a close request, |
| 1813 | * and the other side will eventually respond with a confirmation. |
| 1814 | * Thus, we cannot free the channel here, because then there would be |
| 1815 | * no-one to receive the confirmation. The channel gets freed when |
| 1816 | * the confirmation arrives. |
| 1817 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1818 | if (c->type != SSH_CHANNEL_CLOSED) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1819 | /* |
| 1820 | * Not a closed channel - mark it as draining, which will |
| 1821 | * cause it to be freed later. |
| 1822 | */ |
Damien Miller | 76765c0 | 2002-01-22 23:21:15 +1100 | [diff] [blame] | 1823 | buffer_clear(&c->input); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1824 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1825 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1826 | } |
| 1827 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1828 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1829 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1830 | channel_input_oclose(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1831 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1832 | int id = packet_get_int(); |
| 1833 | Channel *c = channel_lookup(id); |
Damien Miller | 66823cd | 2002-01-22 23:11:38 +1100 | [diff] [blame] | 1834 | |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1835 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1836 | if (c == NULL) |
| 1837 | packet_disconnect("Received oclose for nonexistent channel %d.", id); |
| 1838 | chan_rcvd_oclose(c); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1839 | } |
| 1840 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1841 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1842 | channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1843 | { |
| 1844 | int id = packet_get_int(); |
| 1845 | Channel *c = channel_lookup(id); |
| 1846 | |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1847 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1848 | if (c == NULL) |
| 1849 | packet_disconnect("Received close confirmation for " |
| 1850 | "out-of-range channel %d.", id); |
| 1851 | if (c->type != SSH_CHANNEL_CLOSED) |
| 1852 | packet_disconnect("Received close confirmation for " |
| 1853 | "non-closed channel %d (type %d).", id, c->type); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1854 | channel_free(c); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1855 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1856 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1857 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1858 | channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt) |
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 | int id, remote_id; |
| 1861 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1862 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1863 | id = packet_get_int(); |
| 1864 | c = channel_lookup(id); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1865 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1866 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
| 1867 | packet_disconnect("Received open confirmation for " |
| 1868 | "non-opening channel %d.", id); |
| 1869 | remote_id = packet_get_int(); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1870 | /* 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] | 1871 | c->remote_id = remote_id; |
| 1872 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1873 | |
| 1874 | if (compat20) { |
| 1875 | c->remote_window = packet_get_int(); |
| 1876 | c->remote_maxpacket = packet_get_int(); |
Damien Miller | 67f0bc0 | 2002-02-05 12:23:08 +1100 | [diff] [blame] | 1877 | if (c->confirm) { |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1878 | debug2("callback start"); |
Damien Miller | 67f0bc0 | 2002-02-05 12:23:08 +1100 | [diff] [blame] | 1879 | c->confirm(c->self, NULL); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1880 | debug2("callback done"); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1881 | } |
| 1882 | debug("channel %d: open confirm rwindow %d rmax %d", c->self, |
| 1883 | c->remote_window, c->remote_maxpacket); |
| 1884 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1885 | packet_check_eom(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1886 | } |
| 1887 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1888 | static char * |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1889 | reason2txt(int reason) |
| 1890 | { |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 1891 | switch (reason) { |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1892 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
| 1893 | return "administratively prohibited"; |
| 1894 | case SSH2_OPEN_CONNECT_FAILED: |
| 1895 | return "connect failed"; |
| 1896 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: |
| 1897 | return "unknown channel type"; |
| 1898 | case SSH2_OPEN_RESOURCE_SHORTAGE: |
| 1899 | return "resource shortage"; |
| 1900 | } |
Ben Lindstrom | e259544 | 2001-06-05 20:01:39 +0000 | [diff] [blame] | 1901 | return "unknown reason"; |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1902 | } |
| 1903 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1904 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1905 | channel_input_open_failure(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1906 | { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 1907 | int id, reason; |
| 1908 | char *msg = NULL, *lang = NULL; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1909 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1910 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1911 | id = packet_get_int(); |
| 1912 | c = channel_lookup(id); |
| 1913 | |
| 1914 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
| 1915 | packet_disconnect("Received open failure for " |
| 1916 | "non-opening channel %d.", id); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1917 | if (compat20) { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 1918 | reason = packet_get_int(); |
Ben Lindstrom | f343674 | 2001-04-29 19:52:00 +0000 | [diff] [blame] | 1919 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 1920 | msg = packet_get_string(NULL); |
| 1921 | lang = packet_get_string(NULL); |
| 1922 | } |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1923 | log("channel %d: open failed: %s%s%s", id, |
| 1924 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 1925 | if (msg != NULL) |
| 1926 | xfree(msg); |
| 1927 | if (lang != NULL) |
| 1928 | xfree(lang); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1929 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1930 | packet_check_eom(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1931 | /* Free the channel. This will also close the socket. */ |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1932 | channel_free(c); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1933 | } |
| 1934 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1935 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1936 | channel_input_window_adjust(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1937 | { |
| 1938 | Channel *c; |
| 1939 | int id, adjust; |
| 1940 | |
| 1941 | if (!compat20) |
| 1942 | return; |
| 1943 | |
| 1944 | /* Get the channel number and verify it. */ |
| 1945 | id = packet_get_int(); |
| 1946 | c = channel_lookup(id); |
| 1947 | |
| 1948 | if (c == NULL || c->type != SSH_CHANNEL_OPEN) { |
| 1949 | log("Received window adjust for " |
| 1950 | "non-open channel %d.", id); |
| 1951 | return; |
| 1952 | } |
| 1953 | adjust = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1954 | packet_check_eom(); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1955 | debug2("channel %d: rcvd adjust %d", id, adjust); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1956 | c->remote_window += adjust; |
| 1957 | } |
| 1958 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1959 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 1960 | channel_input_port_open(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1961 | { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1962 | Channel *c = NULL; |
| 1963 | u_short host_port; |
| 1964 | char *host, *originator_string; |
| 1965 | int remote_id, sock = -1; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1966 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1967 | remote_id = packet_get_int(); |
| 1968 | host = packet_get_string(NULL); |
| 1969 | host_port = packet_get_int(); |
| 1970 | |
| 1971 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { |
| 1972 | originator_string = packet_get_string(NULL); |
| 1973 | } else { |
| 1974 | originator_string = xstrdup("unknown (remote did not supply name)"); |
| 1975 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1976 | packet_check_eom(); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1977 | sock = channel_connect_to(host, host_port); |
| 1978 | if (sock != -1) { |
| 1979 | c = channel_new("connected socket", |
| 1980 | SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0, |
| 1981 | originator_string, 1); |
Damien Miller | 699d003 | 2002-02-08 22:07:16 +1100 | [diff] [blame] | 1982 | c->remote_id = remote_id; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1983 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1984 | if (c == NULL) { |
| 1985 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 1986 | packet_put_int(remote_id); |
| 1987 | packet_send(); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1988 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1989 | xfree(host); |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 1990 | } |
| 1991 | |
| 1992 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1993 | /* -- tcp forwarding */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1994 | |
Ben Lindstrom | 908afed | 2001-10-03 17:34:59 +0000 | [diff] [blame] | 1995 | void |
| 1996 | channel_set_af(int af) |
| 1997 | { |
| 1998 | IPv4or6 = af; |
| 1999 | } |
| 2000 | |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2001 | static int |
| 2002 | channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port, |
| 2003 | 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] | 2004 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2005 | Channel *c; |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2006 | int success, sock, on = 1; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2007 | struct addrinfo hints, *ai, *aitop; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2008 | const char *host; |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2009 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2010 | struct linger linger; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2011 | |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2012 | success = 0; |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2013 | host = (type == SSH_CHANNEL_RPORT_LISTENER) ? |
| 2014 | listen_addr : host_to_connect; |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2015 | |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2016 | if (host == NULL) { |
| 2017 | error("No forward host name."); |
| 2018 | return success; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2019 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2020 | if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2021 | error("Forward host name too long."); |
| 2022 | return success; |
| 2023 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2024 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2025 | /* |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2026 | * getaddrinfo returns a loopback address if the hostname is |
| 2027 | * set to NULL and hints.ai_flags is not AI_PASSIVE |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2028 | */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2029 | memset(&hints, 0, sizeof(hints)); |
| 2030 | hints.ai_family = IPv4or6; |
| 2031 | hints.ai_flags = gateway_ports ? AI_PASSIVE : 0; |
| 2032 | hints.ai_socktype = SOCK_STREAM; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2033 | snprintf(strport, sizeof strport, "%d", listen_port); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2034 | if (getaddrinfo(NULL, strport, &hints, &aitop) != 0) |
| 2035 | packet_disconnect("getaddrinfo: fatal error"); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2036 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2037 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 2038 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 2039 | continue; |
| 2040 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
| 2041 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2042 | error("channel_setup_fwd_listener: getnameinfo failed"); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2043 | continue; |
| 2044 | } |
| 2045 | /* Create a port to listen for the host. */ |
| 2046 | sock = socket(ai->ai_family, SOCK_STREAM, 0); |
| 2047 | if (sock < 0) { |
| 2048 | /* this is no error since kernel may not support ipv6 */ |
| 2049 | verbose("socket: %.100s", strerror(errno)); |
| 2050 | continue; |
| 2051 | } |
| 2052 | /* |
| 2053 | * Set socket options. We would like the socket to disappear |
| 2054 | * as soon as it has been closed for whatever reason. |
| 2055 | */ |
Ben Lindstrom | 733a235 | 2002-03-05 01:31:28 +0000 | [diff] [blame] | 2056 | setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2057 | linger.l_onoff = 1; |
| 2058 | linger.l_linger = 5; |
Ben Lindstrom | 733a235 | 2002-03-05 01:31:28 +0000 | [diff] [blame] | 2059 | setsockopt(sock, SOL_SOCKET, SO_LINGER, &linger, sizeof(linger)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2060 | debug("Local forwarding listening on %s port %s.", ntop, strport); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2061 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2062 | /* Bind the socket to the address. */ |
| 2063 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
| 2064 | /* address can be in use ipv6 address is already bound */ |
Damien Miller | 3c7eeb2 | 2000-03-03 22:35:33 +1100 | [diff] [blame] | 2065 | if (!ai->ai_next) |
| 2066 | error("bind: %.100s", strerror(errno)); |
| 2067 | else |
| 2068 | verbose("bind: %.100s", strerror(errno)); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 2069 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2070 | close(sock); |
| 2071 | continue; |
| 2072 | } |
| 2073 | /* Start listening for connections on the socket. */ |
| 2074 | if (listen(sock, 5) < 0) { |
| 2075 | error("listen: %.100s", strerror(errno)); |
| 2076 | close(sock); |
| 2077 | continue; |
| 2078 | } |
| 2079 | /* Allocate a channel number for the socket. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2080 | c = channel_new("port listener", type, sock, sock, -1, |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2081 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 2082 | 0, xstrdup("port listener"), 1); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2083 | strlcpy(c->path, host, sizeof(c->path)); |
| 2084 | c->host_port = port_to_connect; |
| 2085 | c->listening_port = listen_port; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2086 | success = 1; |
| 2087 | } |
| 2088 | if (success == 0) |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2089 | error("channel_setup_fwd_listener: cannot listen to port: %d", |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2090 | listen_port); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2091 | freeaddrinfo(aitop); |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2092 | return success; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2093 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2094 | |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2095 | /* protocol local port fwd, used by ssh (and sshd in v1) */ |
| 2096 | int |
| 2097 | channel_setup_local_fwd_listener(u_short listen_port, |
| 2098 | const char *host_to_connect, u_short port_to_connect, int gateway_ports) |
| 2099 | { |
| 2100 | return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER, |
| 2101 | NULL, listen_port, host_to_connect, port_to_connect, gateway_ports); |
| 2102 | } |
| 2103 | |
| 2104 | /* protocol v2 remote port fwd, used by sshd */ |
| 2105 | int |
| 2106 | channel_setup_remote_fwd_listener(const char *listen_address, |
| 2107 | u_short listen_port, int gateway_ports) |
| 2108 | { |
| 2109 | return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER, |
| 2110 | listen_address, listen_port, NULL, 0, gateway_ports); |
| 2111 | } |
| 2112 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2113 | /* |
| 2114 | * Initiate forwarding of connections to port "port" on remote host through |
| 2115 | * the secure channel to host:port from local side. |
| 2116 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2117 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2118 | void |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2119 | channel_request_remote_forwarding(u_short listen_port, |
| 2120 | const char *host_to_connect, u_short port_to_connect) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2121 | { |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 2122 | int type, success = 0; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2123 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2124 | /* Record locally that connection to this host/port is permitted. */ |
| 2125 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) |
| 2126 | fatal("channel_request_remote_forwarding: too many forwards"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2127 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2128 | /* Send the forward request to the remote side. */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2129 | if (compat20) { |
| 2130 | const char *address_to_bind = "0.0.0.0"; |
| 2131 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
| 2132 | packet_put_cstring("tcpip-forward"); |
Damien Miller | 2797f7f | 2002-04-23 21:09:44 +1000 | [diff] [blame^] | 2133 | packet_put_char(1); /* boolean: want reply */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2134 | packet_put_cstring(address_to_bind); |
| 2135 | packet_put_int(listen_port); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2136 | packet_send(); |
| 2137 | packet_write_wait(); |
| 2138 | /* Assume that server accepts the request */ |
| 2139 | success = 1; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2140 | } else { |
| 2141 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2142 | packet_put_int(listen_port); |
Damien Miller | 8bb73be | 2000-04-19 16:26:12 +1000 | [diff] [blame] | 2143 | packet_put_cstring(host_to_connect); |
| 2144 | packet_put_int(port_to_connect); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2145 | packet_send(); |
| 2146 | packet_write_wait(); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2147 | |
| 2148 | /* Wait for response from the remote side. */ |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 2149 | type = packet_read(); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2150 | switch (type) { |
| 2151 | case SSH_SMSG_SUCCESS: |
| 2152 | success = 1; |
| 2153 | break; |
| 2154 | case SSH_SMSG_FAILURE: |
| 2155 | log("Warning: Server denied remote port forwarding."); |
| 2156 | break; |
| 2157 | default: |
| 2158 | /* Unknown packet */ |
| 2159 | packet_disconnect("Protocol error for port forward request:" |
| 2160 | "received packet type %d.", type); |
| 2161 | } |
| 2162 | } |
| 2163 | if (success) { |
| 2164 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); |
| 2165 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; |
| 2166 | permitted_opens[num_permitted_opens].listen_port = listen_port; |
| 2167 | num_permitted_opens++; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2168 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2169 | } |
| 2170 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2171 | /* |
| 2172 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates |
| 2173 | * listening for the port, and sends back a success reply (or disconnect |
| 2174 | * message if there was an error). This never returns if there was an error. |
| 2175 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2176 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2177 | void |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2178 | channel_input_port_forward_request(int is_root, int gateway_ports) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2179 | { |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 2180 | u_short port, host_port; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2181 | char *hostname; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2182 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2183 | /* Get arguments from the packet. */ |
| 2184 | port = packet_get_int(); |
| 2185 | hostname = packet_get_string(NULL); |
| 2186 | host_port = packet_get_int(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2187 | |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 2188 | #ifndef HAVE_CYGWIN |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2189 | /* |
| 2190 | * Check that an unprivileged user is not trying to forward a |
| 2191 | * privileged port. |
| 2192 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2193 | if (port < IPPORT_RESERVED && !is_root) |
| 2194 | packet_disconnect("Requested forwarding of port %d but user is not root.", |
| 2195 | port); |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 2196 | #endif |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2197 | /* Initiate forwarding */ |
Damien Miller | b16461c | 2002-01-22 23:29:22 +1100 | [diff] [blame] | 2198 | channel_setup_local_fwd_listener(port, hostname, host_port, gateway_ports); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2199 | |
| 2200 | /* Free the argument string. */ |
| 2201 | xfree(hostname); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2202 | } |
| 2203 | |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2204 | /* |
| 2205 | * Permits opening to any host/port if permitted_opens[] is empty. This is |
| 2206 | * usually called by the server, because the user could connect to any port |
| 2207 | * anyway, and the server has no way to know but to trust the client anyway. |
| 2208 | */ |
| 2209 | void |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 2210 | channel_permit_all_opens(void) |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2211 | { |
| 2212 | if (num_permitted_opens == 0) |
| 2213 | all_opens_permitted = 1; |
| 2214 | } |
| 2215 | |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 2216 | void |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2217 | channel_add_permitted_opens(char *host, int port) |
| 2218 | { |
| 2219 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) |
| 2220 | fatal("channel_request_remote_forwarding: too many forwards"); |
| 2221 | debug("allow port forwarding to host %s port %d", host, port); |
| 2222 | |
| 2223 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); |
| 2224 | permitted_opens[num_permitted_opens].port_to_connect = port; |
| 2225 | num_permitted_opens++; |
| 2226 | |
| 2227 | all_opens_permitted = 0; |
| 2228 | } |
| 2229 | |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 2230 | void |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2231 | channel_clear_permitted_opens(void) |
| 2232 | { |
| 2233 | int i; |
| 2234 | |
| 2235 | for (i = 0; i < num_permitted_opens; i++) |
| 2236 | xfree(permitted_opens[i].host_to_connect); |
| 2237 | num_permitted_opens = 0; |
| 2238 | |
| 2239 | } |
| 2240 | |
| 2241 | |
| 2242 | /* return socket to remote host, port */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2243 | static int |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2244 | connect_to(const char *host, u_short port) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2245 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2246 | struct addrinfo hints, *ai, *aitop; |
| 2247 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
| 2248 | int gaierr; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2249 | int sock = -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2250 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2251 | memset(&hints, 0, sizeof(hints)); |
| 2252 | hints.ai_family = IPv4or6; |
| 2253 | hints.ai_socktype = SOCK_STREAM; |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2254 | snprintf(strport, sizeof strport, "%d", port); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2255 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2256 | error("connect_to %.100s: unknown host (%s)", host, |
| 2257 | gai_strerror(gaierr)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2258 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2259 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2260 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 2261 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 2262 | continue; |
| 2263 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
| 2264 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2265 | error("connect_to: getnameinfo failed"); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2266 | continue; |
| 2267 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2268 | sock = socket(ai->ai_family, SOCK_STREAM, 0); |
| 2269 | if (sock < 0) { |
| 2270 | error("socket: %.100s", strerror(errno)); |
| 2271 | continue; |
| 2272 | } |
Ben Lindstrom | 48bd7c1 | 2001-01-09 00:35:42 +0000 | [diff] [blame] | 2273 | if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0) |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 2274 | fatal("connect_to: F_SETFL: %s", strerror(errno)); |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 2275 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 && |
| 2276 | errno != EINPROGRESS) { |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2277 | error("connect_to %.100s port %s: %.100s", ntop, strport, |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2278 | strerror(errno)); |
| 2279 | close(sock); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 2280 | continue; /* fail -- try next */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2281 | } |
| 2282 | break; /* success */ |
| 2283 | |
| 2284 | } |
| 2285 | freeaddrinfo(aitop); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2286 | if (!ai) { |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2287 | error("connect_to %.100s port %d: failed.", host, port); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2288 | return -1; |
| 2289 | } |
| 2290 | /* success */ |
Ben Lindstrom | 1ebd7a5 | 2002-02-26 18:12:51 +0000 | [diff] [blame] | 2291 | set_nodelay(sock); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2292 | return sock; |
| 2293 | } |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2294 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2295 | int |
Ben Lindstrom | 173e646 | 2001-07-04 05:15:15 +0000 | [diff] [blame] | 2296 | channel_connect_by_listen_address(u_short listen_port) |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2297 | { |
| 2298 | int i; |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2299 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2300 | for (i = 0; i < num_permitted_opens; i++) |
| 2301 | if (permitted_opens[i].listen_port == listen_port) |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2302 | return connect_to( |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2303 | permitted_opens[i].host_to_connect, |
| 2304 | permitted_opens[i].port_to_connect); |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 2305 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
| 2306 | listen_port); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2307 | return -1; |
| 2308 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2309 | |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2310 | /* Check if connecting to that port is permitted and connect. */ |
| 2311 | int |
| 2312 | channel_connect_to(const char *host, u_short port) |
| 2313 | { |
| 2314 | int i, permit; |
| 2315 | |
| 2316 | permit = all_opens_permitted; |
| 2317 | if (!permit) { |
| 2318 | for (i = 0; i < num_permitted_opens; i++) |
| 2319 | if (permitted_opens[i].port_to_connect == port && |
| 2320 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
| 2321 | permit = 1; |
| 2322 | |
| 2323 | } |
| 2324 | if (!permit) { |
| 2325 | log("Received request to connect to host %.100s port %d, " |
| 2326 | "but the request was denied.", host, port); |
| 2327 | return -1; |
| 2328 | } |
| 2329 | return connect_to(host, port); |
| 2330 | } |
| 2331 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2332 | /* -- X11 forwarding */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2333 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2334 | /* |
| 2335 | * Creates an internet domain socket for listening for X11 connections. |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2336 | * Returns a suitable display number for the DISPLAY variable, or -1 if |
| 2337 | * an error occurs. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2338 | */ |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2339 | int |
Damien Miller | 95c249f | 2002-02-05 12:11:34 +1100 | [diff] [blame] | 2340 | x11_create_display_inet(int x11_display_offset, int x11_use_localhost, |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 2341 | int single_connection) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2342 | { |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 2343 | Channel *nc = NULL; |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 2344 | int display_number, sock; |
| 2345 | u_short port; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2346 | struct addrinfo hints, *ai, *aitop; |
| 2347 | char strport[NI_MAXSERV]; |
| 2348 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2349 | |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 2350 | for (display_number = x11_display_offset; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 2351 | display_number < MAX_DISPLAYS; |
| 2352 | display_number++) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2353 | port = 6000 + display_number; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2354 | memset(&hints, 0, sizeof(hints)); |
| 2355 | hints.ai_family = IPv4or6; |
Damien Miller | 95c249f | 2002-02-05 12:11:34 +1100 | [diff] [blame] | 2356 | hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2357 | hints.ai_socktype = SOCK_STREAM; |
| 2358 | snprintf(strport, sizeof strport, "%d", port); |
| 2359 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { |
| 2360 | error("getaddrinfo: %.100s", gai_strerror(gaierr)); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2361 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2362 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2363 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 2364 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 2365 | continue; |
| 2366 | sock = socket(ai->ai_family, SOCK_STREAM, 0); |
| 2367 | if (sock < 0) { |
Damien Miller | 89d9796 | 2000-10-14 12:37:19 +1100 | [diff] [blame] | 2368 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
Damien Miller | e219273 | 2000-01-17 13:22:55 +1100 | [diff] [blame] | 2369 | error("socket: %.100s", strerror(errno)); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2370 | return -1; |
Damien Miller | e219273 | 2000-01-17 13:22:55 +1100 | [diff] [blame] | 2371 | } else { |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 2372 | debug("x11_create_display_inet: Socket family %d not supported", |
| 2373 | ai->ai_family); |
Damien Miller | e219273 | 2000-01-17 13:22:55 +1100 | [diff] [blame] | 2374 | continue; |
| 2375 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2376 | } |
| 2377 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
| 2378 | debug("bind port %d: %.100s", port, strerror(errno)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2379 | close(sock); |
Damien Miller | 3c7eeb2 | 2000-03-03 22:35:33 +1100 | [diff] [blame] | 2380 | |
| 2381 | if (ai->ai_next) |
| 2382 | continue; |
| 2383 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2384 | for (n = 0; n < num_socks; n++) { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2385 | close(socks[n]); |
| 2386 | } |
| 2387 | num_socks = 0; |
| 2388 | break; |
| 2389 | } |
| 2390 | socks[num_socks++] = sock; |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 2391 | #ifndef DONT_TRY_OTHER_AF |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2392 | if (num_socks == NUM_SOCKS) |
| 2393 | break; |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 2394 | #else |
| 2395 | break; |
| 2396 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2397 | } |
Ben Lindstrom | 87b147f | 2001-01-25 00:41:12 +0000 | [diff] [blame] | 2398 | freeaddrinfo(aitop); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2399 | if (num_socks > 0) |
| 2400 | break; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2401 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2402 | if (display_number >= MAX_DISPLAYS) { |
| 2403 | error("Failed to allocate internet-domain X11 display socket."); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2404 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2405 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2406 | /* Start listening for connections on the socket. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2407 | for (n = 0; n < num_socks; n++) { |
| 2408 | sock = socks[n]; |
| 2409 | if (listen(sock, 5) < 0) { |
| 2410 | error("listen: %.100s", strerror(errno)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2411 | close(sock); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2412 | return -1; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2413 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2414 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2415 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2416 | /* Allocate a channel for each socket. */ |
| 2417 | for (n = 0; n < num_socks; n++) { |
| 2418 | sock = socks[n]; |
Damien Miller | e737856 | 2001-12-21 14:58:35 +1100 | [diff] [blame] | 2419 | nc = channel_new("x11 listener", |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2420 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
| 2421 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 2422 | 0, xstrdup("X11 inet listener"), 1); |
Damien Miller | 699d003 | 2002-02-08 22:07:16 +1100 | [diff] [blame] | 2423 | nc->single_connection = single_connection; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2424 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2425 | |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2426 | /* Return the display number for the DISPLAY environment variable. */ |
| 2427 | return display_number; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2428 | } |
| 2429 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2430 | static int |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 2431 | connect_local_xsocket(u_int dnr) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2432 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2433 | int sock; |
| 2434 | struct sockaddr_un addr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2435 | |
Damien Miller | 3afe375 | 2001-12-21 12:39:51 +1100 | [diff] [blame] | 2436 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
| 2437 | if (sock < 0) |
| 2438 | error("socket: %.100s", strerror(errno)); |
| 2439 | memset(&addr, 0, sizeof(addr)); |
| 2440 | addr.sun_family = AF_UNIX; |
| 2441 | snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr); |
| 2442 | if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0) |
| 2443 | return sock; |
| 2444 | close(sock); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2445 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
| 2446 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2447 | } |
| 2448 | |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2449 | int |
| 2450 | x11_connect_display(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2451 | { |
Damien Miller | 398e1cf | 2002-02-05 11:52:13 +1100 | [diff] [blame] | 2452 | int display_number, sock = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2453 | const char *display; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2454 | char buf[1024], *cp; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2455 | struct addrinfo hints, *ai, *aitop; |
| 2456 | char strport[NI_MAXSERV]; |
| 2457 | int gaierr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2458 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2459 | /* Try to open a socket for the local X server. */ |
| 2460 | display = getenv("DISPLAY"); |
| 2461 | if (!display) { |
| 2462 | error("DISPLAY not set."); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2463 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2464 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2465 | /* |
| 2466 | * Now we decode the value of the DISPLAY variable and make a |
| 2467 | * connection to the real X server. |
| 2468 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2469 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2470 | /* |
| 2471 | * Check if it is a unix domain socket. Unix domain displays are in |
| 2472 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] |
| 2473 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2474 | if (strncmp(display, "unix:", 5) == 0 || |
| 2475 | display[0] == ':') { |
| 2476 | /* Connect to the unix domain socket. */ |
| 2477 | if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) { |
| 2478 | error("Could not parse display number from DISPLAY: %.100s", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 2479 | display); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2480 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2481 | } |
| 2482 | /* Create a socket. */ |
| 2483 | sock = connect_local_xsocket(display_number); |
| 2484 | if (sock < 0) |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2485 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2486 | |
| 2487 | /* OK, we now have a connection to the display. */ |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2488 | return sock; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2489 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2490 | /* |
| 2491 | * Connect to an inet socket. The DISPLAY value is supposedly |
| 2492 | * hostname:d[.s], where hostname may also be numeric IP address. |
| 2493 | */ |
Ben Lindstrom | ccd8d07 | 2001-12-07 17:26:48 +0000 | [diff] [blame] | 2494 | strlcpy(buf, display, sizeof(buf)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2495 | cp = strchr(buf, ':'); |
| 2496 | if (!cp) { |
| 2497 | error("Could not find ':' in DISPLAY: %.100s", display); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2498 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2499 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2500 | *cp = 0; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2501 | /* 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] | 2502 | if (sscanf(cp + 1, "%d", &display_number) != 1) { |
| 2503 | error("Could not parse display number from DISPLAY: %.100s", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 2504 | display); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2505 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2506 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2507 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2508 | /* Look up the host address */ |
| 2509 | memset(&hints, 0, sizeof(hints)); |
| 2510 | hints.ai_family = IPv4or6; |
| 2511 | hints.ai_socktype = SOCK_STREAM; |
| 2512 | snprintf(strport, sizeof strport, "%d", 6000 + display_number); |
| 2513 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
| 2514 | error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr)); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2515 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2516 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2517 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 2518 | /* Create a socket. */ |
| 2519 | sock = socket(ai->ai_family, SOCK_STREAM, 0); |
| 2520 | if (sock < 0) { |
| 2521 | debug("socket: %.100s", strerror(errno)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2522 | continue; |
| 2523 | } |
| 2524 | /* Connect it to the display. */ |
| 2525 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
| 2526 | debug("connect %.100s port %d: %.100s", buf, |
| 2527 | 6000 + display_number, strerror(errno)); |
| 2528 | close(sock); |
| 2529 | continue; |
| 2530 | } |
| 2531 | /* Success */ |
| 2532 | break; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2533 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2534 | freeaddrinfo(aitop); |
| 2535 | if (!ai) { |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2536 | error("connect %.100s port %d: %.100s", buf, 6000 + display_number, |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2537 | strerror(errno)); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2538 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2539 | } |
Damien Miller | 398e1cf | 2002-02-05 11:52:13 +1100 | [diff] [blame] | 2540 | set_nodelay(sock); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2541 | return sock; |
| 2542 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2543 | |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2544 | /* |
| 2545 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains |
| 2546 | * the remote channel number. We should do whatever we want, and respond |
| 2547 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. |
| 2548 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2549 | |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2550 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2551 | x11_input_open(int type, u_int32_t seq, void *ctxt) |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2552 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2553 | Channel *c = NULL; |
| 2554 | int remote_id, sock = 0; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2555 | char *remote_host; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2556 | |
| 2557 | debug("Received X11 open request."); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2558 | |
| 2559 | remote_id = packet_get_int(); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2560 | |
| 2561 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2562 | remote_host = packet_get_string(NULL); |
| 2563 | } else { |
| 2564 | remote_host = xstrdup("unknown (remote did not supply name)"); |
| 2565 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2566 | packet_check_eom(); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2567 | |
| 2568 | /* Obtain a connection to the real X display. */ |
| 2569 | sock = x11_connect_display(); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2570 | if (sock != -1) { |
| 2571 | /* Allocate a channel for this connection. */ |
| 2572 | c = channel_new("connected x11 socket", |
| 2573 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, |
| 2574 | remote_host, 1); |
Damien Miller | 699d003 | 2002-02-08 22:07:16 +1100 | [diff] [blame] | 2575 | c->remote_id = remote_id; |
| 2576 | c->force_drain = 1; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2577 | } |
| 2578 | if (c == NULL) { |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2579 | /* Send refusal to the remote host. */ |
| 2580 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2581 | packet_put_int(remote_id); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2582 | } else { |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2583 | /* Send a confirmation to the remote host. */ |
| 2584 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2585 | packet_put_int(remote_id); |
| 2586 | packet_put_int(c->self); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2587 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2588 | packet_send(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2589 | } |
| 2590 | |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 2591 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
| 2592 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2593 | deny_input_open(int type, u_int32_t seq, void *ctxt) |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 2594 | { |
| 2595 | int rchan = packet_get_int(); |
Ben Lindstrom | 1c37c6a | 2001-12-06 18:00:18 +0000 | [diff] [blame] | 2596 | switch (type) { |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 2597 | case SSH_SMSG_AGENT_OPEN: |
| 2598 | error("Warning: ssh server tried agent forwarding."); |
| 2599 | break; |
| 2600 | case SSH_SMSG_X11_OPEN: |
| 2601 | error("Warning: ssh server tried X11 forwarding."); |
| 2602 | break; |
| 2603 | default: |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2604 | error("deny_input_open: type %d", type); |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 2605 | break; |
| 2606 | } |
| 2607 | error("Warning: this is probably a break in attempt by a malicious server."); |
| 2608 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 2609 | packet_put_int(rchan); |
| 2610 | packet_send(); |
| 2611 | } |
| 2612 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2613 | /* |
| 2614 | * Requests forwarding of X11 connections, generates fake authentication |
| 2615 | * data, and enables authentication spoofing. |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2616 | * This should be called in the client only. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2617 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2618 | void |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2619 | x11_request_forwarding_with_spoofing(int client_session_id, |
| 2620 | const char *proto, const char *data) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2621 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 2622 | u_int data_len = (u_int) strlen(data) / 2; |
Ben Lindstrom | b3211a8 | 2001-02-10 22:33:19 +0000 | [diff] [blame] | 2623 | u_int i, value, len; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2624 | char *new_data; |
| 2625 | int screen_number; |
| 2626 | const char *cp; |
| 2627 | u_int32_t rand = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2628 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2629 | cp = getenv("DISPLAY"); |
| 2630 | if (cp) |
| 2631 | cp = strchr(cp, ':'); |
| 2632 | if (cp) |
| 2633 | cp = strchr(cp, '.'); |
| 2634 | if (cp) |
| 2635 | screen_number = atoi(cp + 1); |
| 2636 | else |
| 2637 | screen_number = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2638 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2639 | /* Save protocol name. */ |
| 2640 | x11_saved_proto = xstrdup(proto); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2641 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2642 | /* |
| 2643 | * Extract real authentication data and generate fake data of the |
| 2644 | * same length. |
| 2645 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2646 | x11_saved_data = xmalloc(data_len); |
| 2647 | x11_fake_data = xmalloc(data_len); |
| 2648 | for (i = 0; i < data_len; i++) { |
| 2649 | if (sscanf(data + 2 * i, "%2x", &value) != 1) |
| 2650 | fatal("x11_request_forwarding: bad authentication data: %.100s", data); |
| 2651 | if (i % 4 == 0) |
| 2652 | rand = arc4random(); |
| 2653 | x11_saved_data[i] = value; |
| 2654 | x11_fake_data[i] = rand & 0xff; |
| 2655 | rand >>= 8; |
| 2656 | } |
| 2657 | x11_saved_data_len = data_len; |
| 2658 | x11_fake_data_len = data_len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2659 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2660 | /* Convert the fake data into hex. */ |
Ben Lindstrom | b3211a8 | 2001-02-10 22:33:19 +0000 | [diff] [blame] | 2661 | len = 2 * data_len + 1; |
| 2662 | new_data = xmalloc(len); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2663 | for (i = 0; i < data_len; i++) |
Ben Lindstrom | b3211a8 | 2001-02-10 22:33:19 +0000 | [diff] [blame] | 2664 | snprintf(new_data + 2 * i, len - 2 * i, |
| 2665 | "%02x", (u_char) x11_fake_data[i]); |
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 | /* Send the request packet. */ |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2668 | if (compat20) { |
| 2669 | channel_request_start(client_session_id, "x11-req", 0); |
| 2670 | packet_put_char(0); /* XXX bool single connection */ |
| 2671 | } else { |
| 2672 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); |
| 2673 | } |
| 2674 | packet_put_cstring(proto); |
| 2675 | packet_put_cstring(new_data); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2676 | packet_put_int(screen_number); |
| 2677 | packet_send(); |
| 2678 | packet_write_wait(); |
| 2679 | xfree(new_data); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2680 | } |
| 2681 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2682 | |
| 2683 | /* -- agent forwarding */ |
| 2684 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2685 | /* Sends a message to the server to request authentication fd forwarding. */ |
| 2686 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2687 | void |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 2688 | auth_request_forwarding(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2689 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2690 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
| 2691 | packet_send(); |
| 2692 | packet_write_wait(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2693 | } |
| 2694 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2695 | /* |
| 2696 | * Returns the name of the forwarded authentication socket. Returns NULL if |
| 2697 | * there is no forwarded authentication socket. The returned value points to |
| 2698 | * a static buffer. |
| 2699 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2700 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2701 | char * |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 2702 | auth_get_socket_name(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2703 | { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2704 | return auth_sock_name; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2705 | } |
| 2706 | |
| 2707 | /* removes the agent forwarding socket */ |
| 2708 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2709 | void |
Ben Lindstrom | 983c098 | 2001-06-09 01:20:06 +0000 | [diff] [blame] | 2710 | auth_sock_cleanup_proc(void *_pw) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2711 | { |
Ben Lindstrom | 983c098 | 2001-06-09 01:20:06 +0000 | [diff] [blame] | 2712 | struct passwd *pw = _pw; |
| 2713 | |
Ben Lindstrom | 838394c | 2001-06-09 01:11:59 +0000 | [diff] [blame] | 2714 | if (auth_sock_name) { |
Ben Lindstrom | 983c098 | 2001-06-09 01:20:06 +0000 | [diff] [blame] | 2715 | temporarily_use_uid(pw); |
Ben Lindstrom | 838394c | 2001-06-09 01:11:59 +0000 | [diff] [blame] | 2716 | unlink(auth_sock_name); |
| 2717 | rmdir(auth_sock_dir); |
| 2718 | auth_sock_name = NULL; |
Ben Lindstrom | 983c098 | 2001-06-09 01:20:06 +0000 | [diff] [blame] | 2719 | restore_uid(); |
Ben Lindstrom | 838394c | 2001-06-09 01:11:59 +0000 | [diff] [blame] | 2720 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2721 | } |
| 2722 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2723 | /* |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 2724 | * This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2725 | * This starts forwarding authentication requests. |
| 2726 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2727 | |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 2728 | int |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2729 | auth_input_request_forwarding(struct passwd * pw) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2730 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2731 | Channel *nc; |
| 2732 | int sock; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2733 | struct sockaddr_un sunaddr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2734 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2735 | if (auth_get_socket_name() != NULL) { |
| 2736 | error("authentication forwarding requested twice."); |
| 2737 | return 0; |
| 2738 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2739 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2740 | /* Temporarily drop privileged uid for mkdir/bind. */ |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 2741 | temporarily_use_uid(pw); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2742 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2743 | /* Allocate a buffer for the socket name, and format the name. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2744 | auth_sock_name = xmalloc(MAXPATHLEN); |
| 2745 | auth_sock_dir = xmalloc(MAXPATHLEN); |
| 2746 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2747 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2748 | /* Create private directory for socket */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2749 | if (mkdtemp(auth_sock_dir) == NULL) { |
| 2750 | packet_send_debug("Agent forwarding disabled: " |
| 2751 | "mkdtemp() failed: %.100s", strerror(errno)); |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 2752 | restore_uid(); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2753 | xfree(auth_sock_name); |
| 2754 | xfree(auth_sock_dir); |
| 2755 | auth_sock_name = NULL; |
| 2756 | auth_sock_dir = NULL; |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 2757 | return 0; |
| 2758 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2759 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%d", |
| 2760 | auth_sock_dir, (int) getpid()); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2761 | |
Ben Lindstrom | 838394c | 2001-06-09 01:11:59 +0000 | [diff] [blame] | 2762 | /* delete agent socket on fatal() */ |
Ben Lindstrom | 983c098 | 2001-06-09 01:20:06 +0000 | [diff] [blame] | 2763 | fatal_add_cleanup(auth_sock_cleanup_proc, pw); |
Ben Lindstrom | 838394c | 2001-06-09 01:11:59 +0000 | [diff] [blame] | 2764 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2765 | /* Create the socket. */ |
| 2766 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
| 2767 | if (sock < 0) |
| 2768 | packet_disconnect("socket: %.100s", strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2769 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2770 | /* Bind it to the name. */ |
| 2771 | memset(&sunaddr, 0, sizeof(sunaddr)); |
| 2772 | sunaddr.sun_family = AF_UNIX; |
Ben Lindstrom | ccd8d07 | 2001-12-07 17:26:48 +0000 | [diff] [blame] | 2773 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2774 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2775 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) |
| 2776 | packet_disconnect("bind: %.100s", strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2777 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2778 | /* Restore the privileged uid. */ |
| 2779 | restore_uid(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2780 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2781 | /* Start listening on the socket. */ |
| 2782 | if (listen(sock, 5) < 0) |
| 2783 | packet_disconnect("listen: %.100s", strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2784 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2785 | /* Allocate a channel for the authentication agent socket. */ |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2786 | nc = channel_new("auth socket", |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2787 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, |
| 2788 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, |
| 2789 | 0, xstrdup("auth socket"), 1); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2790 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 2791 | return 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2792 | } |
| 2793 | |
| 2794 | /* This is called to process an SSH_SMSG_AGENT_OPEN message. */ |
| 2795 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2796 | void |
Damien Miller | 630d6f4 | 2002-01-22 23:17:30 +1100 | [diff] [blame] | 2797 | auth_input_open_request(int type, u_int32_t seq, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2798 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2799 | Channel *c = NULL; |
| 2800 | int remote_id, sock; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2801 | char *name; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2802 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2803 | /* Read the remote channel number from the message. */ |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2804 | remote_id = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2805 | packet_check_eom(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2806 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2807 | /* |
| 2808 | * Get a connection to the local authentication agent (this may again |
| 2809 | * get forwarded). |
| 2810 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2811 | sock = ssh_get_authentication_socket(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2812 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2813 | /* |
| 2814 | * If we could not connect the agent, send an error message back to |
| 2815 | * the server. This should never happen unless the agent dies, |
| 2816 | * because authentication forwarding is only enabled if we have an |
| 2817 | * agent. |
| 2818 | */ |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2819 | if (sock >= 0) { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2820 | name = xstrdup("authentication agent connection"); |
| 2821 | c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, |
| 2822 | -1, 0, 0, 0, name, 1); |
Damien Miller | 699d003 | 2002-02-08 22:07:16 +1100 | [diff] [blame] | 2823 | c->remote_id = remote_id; |
| 2824 | c->force_drain = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2825 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2826 | if (c == NULL) { |
| 2827 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 2828 | packet_put_int(remote_id); |
| 2829 | } else { |
| 2830 | /* Send a confirmation to the remote host. */ |
| 2831 | debug("Forwarding authentication connection."); |
| 2832 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 2833 | packet_put_int(remote_id); |
| 2834 | packet_put_int(c->self); |
| 2835 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2836 | packet_send(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2837 | } |