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 | * |
| 15 | * |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 16 | * SSH2 support added by Markus Friedl. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 17 | * Copyright (c) 1999,2000 Markus Friedl. All rights reserved. |
| 18 | * Copyright (c) 1999 Dug Song. All rights reserved. |
| 19 | * Copyright (c) 1999 Theo de Raadt. All rights reserved. |
| 20 | * |
| 21 | * Redistribution and use in source and binary forms, with or without |
| 22 | * modification, are permitted provided that the following conditions |
| 23 | * are met: |
| 24 | * 1. Redistributions of source code must retain the above copyright |
| 25 | * notice, this list of conditions and the following disclaimer. |
| 26 | * 2. Redistributions in binary form must reproduce the above copyright |
| 27 | * notice, this list of conditions and the following disclaimer in the |
| 28 | * documentation and/or other materials provided with the distribution. |
| 29 | * |
| 30 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 31 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 32 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 33 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 34 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 35 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 36 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 37 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 38 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 39 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 40 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 41 | |
| 42 | #include "includes.h" |
Ben Lindstrom | df4981b | 2001-06-09 01:32:29 +0000 | [diff] [blame^] | 43 | RCSID("$OpenBSD: channels.c,v 1.124 2001/06/05 10:24:32 markus Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 44 | |
| 45 | #include "ssh.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 46 | #include "ssh1.h" |
| 47 | #include "ssh2.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 48 | #include "packet.h" |
| 49 | #include "xmalloc.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 50 | #include "uidswap.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 51 | #include "log.h" |
| 52 | #include "misc.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 53 | #include "channels.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 54 | #include "compat.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 55 | #include "canohost.h" |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 56 | #include "key.h" |
| 57 | #include "authfd.h" |
| 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 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 136 | |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 137 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
| 138 | extern int IPv4or6; |
| 139 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 140 | /* helper */ |
| 141 | void port_open_helper(Channel *c, char *rtype); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 142 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 143 | /* -- channel core */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 144 | |
| 145 | Channel * |
| 146 | channel_lookup(int id) |
| 147 | { |
| 148 | Channel *c; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 149 | |
Damien Miller | c0fd17f | 2000-06-26 10:22:53 +1000 | [diff] [blame] | 150 | if (id < 0 || id > channels_alloc) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 151 | log("channel_lookup: %d: bad id", id); |
| 152 | return NULL; |
| 153 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 154 | c = channels[id]; |
| 155 | if (c == NULL) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 156 | log("channel_lookup: %d: bad id: channel free", id); |
| 157 | return NULL; |
| 158 | } |
| 159 | return c; |
| 160 | } |
| 161 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 162 | /* |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 163 | * Register filedescriptors for a channel, used when allocating a channel or |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 164 | * when the channel consumer/producer is ready, e.g. shell exec'd |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 165 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 166 | |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 167 | void |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 168 | channel_register_fds(Channel *c, int rfd, int wfd, int efd, |
| 169 | int extusage, int nonblock) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 170 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 171 | /* Update the maximum file descriptor value. */ |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 172 | channel_max_fd = MAX(channel_max_fd, rfd); |
| 173 | channel_max_fd = MAX(channel_max_fd, wfd); |
| 174 | channel_max_fd = MAX(channel_max_fd, efd); |
| 175 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 176 | /* XXX set close-on-exec -markus */ |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 177 | |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 178 | c->rfd = rfd; |
| 179 | c->wfd = wfd; |
| 180 | c->sock = (rfd == wfd) ? rfd : -1; |
| 181 | c->efd = efd; |
| 182 | c->extended_usage = extusage; |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 183 | |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 184 | /* XXX ugly hack: nonblock is only set by the server */ |
| 185 | if (nonblock && isatty(c->rfd)) { |
Ben Lindstrom | cc74df7 | 2001-03-05 06:20:14 +0000 | [diff] [blame] | 186 | debug("channel %d: rfd %d isatty", c->self, c->rfd); |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 187 | c->isatty = 1; |
| 188 | if (!isatty(c->wfd)) { |
Ben Lindstrom | cc74df7 | 2001-03-05 06:20:14 +0000 | [diff] [blame] | 189 | error("channel %d: wfd %d is not a tty?", |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 190 | c->self, c->wfd); |
| 191 | } |
| 192 | } else { |
| 193 | c->isatty = 0; |
| 194 | } |
| 195 | |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 196 | /* enable nonblocking mode */ |
| 197 | if (nonblock) { |
| 198 | if (rfd != -1) |
| 199 | set_nonblock(rfd); |
| 200 | if (wfd != -1) |
| 201 | set_nonblock(wfd); |
| 202 | if (efd != -1) |
| 203 | set_nonblock(efd); |
| 204 | } |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 205 | } |
| 206 | |
| 207 | /* |
| 208 | * Allocate a new channel object and set its type and socket. This will cause |
| 209 | * remote_name to be freed. |
| 210 | */ |
| 211 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 212 | Channel * |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 213 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 214 | int window, int maxpack, int extusage, char *remote_name, int nonblock) |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 215 | { |
| 216 | int i, found; |
| 217 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 218 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 219 | /* Do initial allocation if this is the first call. */ |
| 220 | if (channels_alloc == 0) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 221 | chan_init(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 222 | channels_alloc = 10; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 223 | channels = xmalloc(channels_alloc * sizeof(Channel *)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 224 | for (i = 0; i < channels_alloc; i++) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 225 | channels[i] = NULL; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 226 | /* |
| 227 | * Kludge: arrange a call to channel_stop_listening if we |
| 228 | * terminate with fatal(). |
| 229 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 230 | fatal_add_cleanup((void (*) (void *)) channel_stop_listening, NULL); |
| 231 | } |
| 232 | /* Try to find a free slot where to put the new channel. */ |
| 233 | for (found = -1, i = 0; i < channels_alloc; i++) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 234 | if (channels[i] == NULL) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 235 | /* Found a free slot. */ |
| 236 | found = i; |
| 237 | break; |
| 238 | } |
| 239 | if (found == -1) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 240 | /* 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] | 241 | found = channels_alloc; |
| 242 | channels_alloc += 10; |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 243 | debug2("channel: expanding %d", channels_alloc); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 244 | channels = xrealloc(channels, channels_alloc * sizeof(Channel *)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 245 | for (i = found; i < channels_alloc; i++) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 246 | channels[i] = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 247 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 248 | /* Initialize and return new channel. */ |
| 249 | c = channels[found] = xmalloc(sizeof(Channel)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 250 | buffer_init(&c->input); |
| 251 | buffer_init(&c->output); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 252 | buffer_init(&c->extended); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 253 | chan_init_iostates(c); |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 254 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 255 | c->self = found; |
| 256 | c->type = type; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 257 | c->ctype = ctype; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 258 | c->local_window = window; |
| 259 | c->local_window_max = window; |
| 260 | c->local_consumed = 0; |
| 261 | c->local_maxpacket = maxpack; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 262 | c->remote_id = -1; |
| 263 | c->remote_name = remote_name; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 264 | c->remote_window = 0; |
| 265 | c->remote_maxpacket = 0; |
| 266 | c->cb_fn = NULL; |
| 267 | c->cb_arg = NULL; |
| 268 | c->cb_event = 0; |
| 269 | c->dettach_user = NULL; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 270 | c->input_filter = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 271 | debug("channel %d: new [%s]", found, remote_name); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 272 | return c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 273 | } |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 274 | |
| 275 | /* Close all channel fd/socket. */ |
| 276 | |
| 277 | void |
| 278 | channel_close_fds(Channel *c) |
| 279 | { |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 280 | debug3("channel_close_fds: channel %d: r %d w %d e %d", |
| 281 | c->self, c->rfd, c->wfd, c->efd); |
| 282 | |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 283 | if (c->sock != -1) { |
| 284 | close(c->sock); |
| 285 | c->sock = -1; |
| 286 | } |
| 287 | if (c->rfd != -1) { |
| 288 | close(c->rfd); |
| 289 | c->rfd = -1; |
| 290 | } |
| 291 | if (c->wfd != -1) { |
| 292 | close(c->wfd); |
| 293 | c->wfd = -1; |
| 294 | } |
| 295 | if (c->efd != -1) { |
| 296 | close(c->efd); |
| 297 | c->efd = -1; |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | /* Free the channel and close its fd/socket. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 302 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 303 | void |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 304 | channel_free(Channel *c) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 305 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 306 | char *s; |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 307 | int i, n; |
| 308 | |
| 309 | for (n = 0, i = 0; i < channels_alloc; i++) |
| 310 | if (channels[i]) |
| 311 | n++; |
Ben Lindstrom | 4c24755 | 2001-06-05 20:56:47 +0000 | [diff] [blame] | 312 | debug("channel_free: channel %d: %s, nchannels %d", c->self, |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 313 | c->remote_name ? c->remote_name : "???", n); |
Ben Lindstrom | 6c3ae2b | 2000-12-30 03:25:14 +0000 | [diff] [blame] | 314 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 315 | s = channel_open_message(); |
Ben Lindstrom | 4c24755 | 2001-06-05 20:56:47 +0000 | [diff] [blame] | 316 | debug3("channel_free: status: %s", s); |
Ben Lindstrom | 6c3ae2b | 2000-12-30 03:25:14 +0000 | [diff] [blame] | 317 | xfree(s); |
| 318 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 319 | if (c->dettach_user != NULL) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 320 | debug("channel_free: channel %d: dettaching channel user", c->self); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 321 | c->dettach_user(c->self, NULL); |
| 322 | } |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 323 | if (c->sock != -1) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 324 | shutdown(c->sock, SHUT_RDWR); |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 325 | channel_close_fds(c); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 326 | buffer_free(&c->input); |
| 327 | buffer_free(&c->output); |
| 328 | buffer_free(&c->extended); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 329 | if (c->remote_name) { |
| 330 | xfree(c->remote_name); |
| 331 | c->remote_name = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 332 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 333 | channels[c->self] = NULL; |
| 334 | xfree(c); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 335 | } |
| 336 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 337 | |
| 338 | /* |
| 339 | * Stops listening for channels, and removes any unix domain sockets that we |
| 340 | * might have. |
| 341 | */ |
| 342 | |
| 343 | void |
| 344 | channel_stop_listening() |
| 345 | { |
| 346 | int i; |
| 347 | Channel *c; |
| 348 | |
| 349 | for (i = 0; i < channels_alloc; i++) { |
| 350 | c = channels[i]; |
| 351 | if (c != NULL) { |
| 352 | switch (c->type) { |
| 353 | case SSH_CHANNEL_AUTH_SOCKET: |
| 354 | close(c->sock); |
Ben Lindstrom | df4981b | 2001-06-09 01:32:29 +0000 | [diff] [blame^] | 355 | /* auth_sock_cleanup_proc deletes the socket */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 356 | channel_free(c); |
| 357 | break; |
| 358 | case SSH_CHANNEL_PORT_LISTENER: |
| 359 | case SSH_CHANNEL_RPORT_LISTENER: |
| 360 | case SSH_CHANNEL_X11_LISTENER: |
| 361 | close(c->sock); |
| 362 | channel_free(c); |
| 363 | break; |
| 364 | default: |
| 365 | break; |
| 366 | } |
| 367 | } |
| 368 | } |
| 369 | } |
| 370 | |
| 371 | /* |
| 372 | * Closes the sockets/fds of all channels. This is used to close extra file |
| 373 | * descriptors after a fork. |
| 374 | */ |
| 375 | |
| 376 | void |
| 377 | channel_close_all() |
| 378 | { |
| 379 | int i; |
| 380 | |
| 381 | for (i = 0; i < channels_alloc; i++) |
| 382 | if (channels[i] != NULL) |
| 383 | channel_close_fds(channels[i]); |
| 384 | } |
| 385 | |
| 386 | /* |
| 387 | * Returns true if no channel has too much buffered data, and false if one or |
| 388 | * more channel is overfull. |
| 389 | */ |
| 390 | |
| 391 | int |
| 392 | channel_not_very_much_buffered_data() |
| 393 | { |
| 394 | u_int i; |
| 395 | Channel *c; |
| 396 | |
| 397 | for (i = 0; i < channels_alloc; i++) { |
| 398 | c = channels[i]; |
| 399 | if (c != NULL && c->type == SSH_CHANNEL_OPEN) { |
| 400 | if (!compat20 && buffer_len(&c->input) > packet_get_maxsize()) { |
| 401 | debug("channel %d: big input buffer %d", |
| 402 | c->self, buffer_len(&c->input)); |
| 403 | return 0; |
| 404 | } |
| 405 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
| 406 | debug("channel %d: big output buffer %d", |
| 407 | c->self, buffer_len(&c->output)); |
| 408 | return 0; |
| 409 | } |
| 410 | } |
| 411 | } |
| 412 | return 1; |
| 413 | } |
| 414 | |
| 415 | /* Returns true if any channel is still open. */ |
| 416 | |
| 417 | int |
| 418 | channel_still_open() |
| 419 | { |
| 420 | int i; |
| 421 | Channel *c; |
| 422 | |
| 423 | for (i = 0; i < channels_alloc; i++) { |
| 424 | c = channels[i]; |
| 425 | if (c == NULL) |
| 426 | continue; |
| 427 | switch (c->type) { |
| 428 | case SSH_CHANNEL_X11_LISTENER: |
| 429 | case SSH_CHANNEL_PORT_LISTENER: |
| 430 | case SSH_CHANNEL_RPORT_LISTENER: |
| 431 | case SSH_CHANNEL_CLOSED: |
| 432 | case SSH_CHANNEL_AUTH_SOCKET: |
| 433 | case SSH_CHANNEL_DYNAMIC: |
| 434 | case SSH_CHANNEL_CONNECTING: |
| 435 | case SSH_CHANNEL_ZOMBIE: |
| 436 | continue; |
| 437 | case SSH_CHANNEL_LARVAL: |
| 438 | if (!compat20) |
| 439 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); |
| 440 | continue; |
| 441 | case SSH_CHANNEL_OPENING: |
| 442 | case SSH_CHANNEL_OPEN: |
| 443 | case SSH_CHANNEL_X11_OPEN: |
| 444 | return 1; |
| 445 | case SSH_CHANNEL_INPUT_DRAINING: |
| 446 | case SSH_CHANNEL_OUTPUT_DRAINING: |
| 447 | if (!compat13) |
| 448 | fatal("cannot happen: OUT_DRAIN"); |
| 449 | return 1; |
| 450 | default: |
| 451 | fatal("channel_still_open: bad channel type %d", c->type); |
| 452 | /* NOTREACHED */ |
| 453 | } |
| 454 | } |
| 455 | return 0; |
| 456 | } |
| 457 | |
| 458 | /* Returns the id of an open channel suitable for keepaliving */ |
| 459 | |
| 460 | int |
| 461 | channel_find_open() |
| 462 | { |
| 463 | int i; |
| 464 | Channel *c; |
| 465 | |
| 466 | for (i = 0; i < channels_alloc; i++) { |
| 467 | c = channels[i]; |
| 468 | if (c == NULL) |
| 469 | continue; |
| 470 | switch (c->type) { |
| 471 | case SSH_CHANNEL_CLOSED: |
| 472 | case SSH_CHANNEL_DYNAMIC: |
| 473 | case SSH_CHANNEL_X11_LISTENER: |
| 474 | case SSH_CHANNEL_PORT_LISTENER: |
| 475 | case SSH_CHANNEL_RPORT_LISTENER: |
| 476 | case SSH_CHANNEL_OPENING: |
| 477 | case SSH_CHANNEL_CONNECTING: |
| 478 | case SSH_CHANNEL_ZOMBIE: |
| 479 | continue; |
| 480 | case SSH_CHANNEL_LARVAL: |
| 481 | case SSH_CHANNEL_AUTH_SOCKET: |
| 482 | case SSH_CHANNEL_OPEN: |
| 483 | case SSH_CHANNEL_X11_OPEN: |
| 484 | return i; |
| 485 | case SSH_CHANNEL_INPUT_DRAINING: |
| 486 | case SSH_CHANNEL_OUTPUT_DRAINING: |
| 487 | if (!compat13) |
| 488 | fatal("cannot happen: OUT_DRAIN"); |
| 489 | return i; |
| 490 | default: |
| 491 | fatal("channel_find_open: bad channel type %d", c->type); |
| 492 | /* NOTREACHED */ |
| 493 | } |
| 494 | } |
| 495 | return -1; |
| 496 | } |
| 497 | |
| 498 | |
| 499 | /* |
| 500 | * Returns a message describing the currently open forwarded connections, |
| 501 | * suitable for sending to the client. The message contains crlf pairs for |
| 502 | * newlines. |
| 503 | */ |
| 504 | |
| 505 | char * |
| 506 | channel_open_message() |
| 507 | { |
| 508 | Buffer buffer; |
| 509 | Channel *c; |
| 510 | char buf[1024], *cp; |
| 511 | int i; |
| 512 | |
| 513 | buffer_init(&buffer); |
| 514 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); |
| 515 | buffer_append(&buffer, buf, strlen(buf)); |
| 516 | for (i = 0; i < channels_alloc; i++) { |
| 517 | c = channels[i]; |
| 518 | if (c == NULL) |
| 519 | continue; |
| 520 | switch (c->type) { |
| 521 | case SSH_CHANNEL_X11_LISTENER: |
| 522 | case SSH_CHANNEL_PORT_LISTENER: |
| 523 | case SSH_CHANNEL_RPORT_LISTENER: |
| 524 | case SSH_CHANNEL_CLOSED: |
| 525 | case SSH_CHANNEL_AUTH_SOCKET: |
| 526 | case SSH_CHANNEL_ZOMBIE: |
| 527 | continue; |
| 528 | case SSH_CHANNEL_LARVAL: |
| 529 | case SSH_CHANNEL_OPENING: |
| 530 | case SSH_CHANNEL_CONNECTING: |
| 531 | case SSH_CHANNEL_DYNAMIC: |
| 532 | case SSH_CHANNEL_OPEN: |
| 533 | case SSH_CHANNEL_X11_OPEN: |
| 534 | case SSH_CHANNEL_INPUT_DRAINING: |
| 535 | case SSH_CHANNEL_OUTPUT_DRAINING: |
| 536 | snprintf(buf, sizeof buf, " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n", |
| 537 | c->self, c->remote_name, |
| 538 | c->type, c->remote_id, |
| 539 | c->istate, buffer_len(&c->input), |
| 540 | c->ostate, buffer_len(&c->output), |
| 541 | c->rfd, c->wfd); |
| 542 | buffer_append(&buffer, buf, strlen(buf)); |
| 543 | continue; |
| 544 | default: |
| 545 | fatal("channel_open_message: bad channel type %d", c->type); |
| 546 | /* NOTREACHED */ |
| 547 | } |
| 548 | } |
| 549 | buffer_append(&buffer, "\0", 1); |
| 550 | cp = xstrdup(buffer_ptr(&buffer)); |
| 551 | buffer_free(&buffer); |
| 552 | return cp; |
| 553 | } |
| 554 | |
| 555 | void |
| 556 | channel_send_open(int id) |
| 557 | { |
| 558 | Channel *c = channel_lookup(id); |
| 559 | if (c == NULL) { |
| 560 | log("channel_send_open: %d: bad id", id); |
| 561 | return; |
| 562 | } |
| 563 | debug("send channel open %d", id); |
| 564 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 565 | packet_put_cstring(c->ctype); |
| 566 | packet_put_int(c->self); |
| 567 | packet_put_int(c->local_window); |
| 568 | packet_put_int(c->local_maxpacket); |
| 569 | packet_send(); |
| 570 | } |
| 571 | |
| 572 | void |
| 573 | channel_request(int id, char *service, int wantconfirm) |
| 574 | { |
| 575 | channel_request_start(id, service, wantconfirm); |
| 576 | packet_send(); |
| 577 | debug("channel request %d: %s", id, service) ; |
| 578 | } |
| 579 | void |
| 580 | channel_request_start(int id, char *service, int wantconfirm) |
| 581 | { |
| 582 | Channel *c = channel_lookup(id); |
| 583 | if (c == NULL) { |
| 584 | log("channel_request: %d: bad id", id); |
| 585 | return; |
| 586 | } |
| 587 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
| 588 | packet_put_int(c->remote_id); |
| 589 | packet_put_cstring(service); |
| 590 | packet_put_char(wantconfirm); |
| 591 | } |
| 592 | void |
| 593 | channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg) |
| 594 | { |
| 595 | Channel *c = channel_lookup(id); |
| 596 | if (c == NULL) { |
| 597 | log("channel_register_callback: %d: bad id", id); |
| 598 | return; |
| 599 | } |
| 600 | c->cb_event = mtype; |
| 601 | c->cb_fn = fn; |
| 602 | c->cb_arg = arg; |
| 603 | } |
| 604 | void |
| 605 | channel_register_cleanup(int id, channel_callback_fn *fn) |
| 606 | { |
| 607 | Channel *c = channel_lookup(id); |
| 608 | if (c == NULL) { |
| 609 | log("channel_register_cleanup: %d: bad id", id); |
| 610 | return; |
| 611 | } |
| 612 | c->dettach_user = fn; |
| 613 | } |
| 614 | void |
| 615 | channel_cancel_cleanup(int id) |
| 616 | { |
| 617 | Channel *c = channel_lookup(id); |
| 618 | if (c == NULL) { |
| 619 | log("channel_cancel_cleanup: %d: bad id", id); |
| 620 | return; |
| 621 | } |
| 622 | c->dettach_user = NULL; |
| 623 | } |
| 624 | void |
| 625 | channel_register_filter(int id, channel_filter_fn *fn) |
| 626 | { |
| 627 | Channel *c = channel_lookup(id); |
| 628 | if (c == NULL) { |
| 629 | log("channel_register_filter: %d: bad id", id); |
| 630 | return; |
| 631 | } |
| 632 | c->input_filter = fn; |
| 633 | } |
| 634 | |
| 635 | void |
| 636 | channel_set_fds(int id, int rfd, int wfd, int efd, |
| 637 | int extusage, int nonblock) |
| 638 | { |
| 639 | Channel *c = channel_lookup(id); |
| 640 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
| 641 | fatal("channel_activate for non-larval channel %d.", id); |
| 642 | channel_register_fds(c, rfd, wfd, efd, extusage, nonblock); |
| 643 | c->type = SSH_CHANNEL_OPEN; |
| 644 | /* XXX window size? */ |
| 645 | c->local_window = c->local_window_max = c->local_maxpacket * 2; |
| 646 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
| 647 | packet_put_int(c->remote_id); |
| 648 | packet_put_int(c->local_window); |
| 649 | packet_send(); |
| 650 | } |
| 651 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 652 | /* |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 653 | * 'channel_pre*' are called just before select() to add any bits relevant to |
| 654 | * channels in the select bitmasks. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 655 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 656 | /* |
| 657 | * 'channel_post*': perform any appropriate operations for channels which |
| 658 | * have events pending. |
| 659 | */ |
| 660 | typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset); |
| 661 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
| 662 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; |
| 663 | |
| 664 | void |
| 665 | channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 666 | { |
| 667 | FD_SET(c->sock, readset); |
| 668 | } |
| 669 | |
| 670 | void |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 671 | channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset) |
| 672 | { |
| 673 | debug3("channel %d: waiting for connection", c->self); |
| 674 | FD_SET(c->sock, writeset); |
| 675 | } |
| 676 | |
| 677 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 678 | channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset) |
| 679 | { |
| 680 | if (buffer_len(&c->input) < packet_get_maxsize()) |
| 681 | FD_SET(c->sock, readset); |
| 682 | if (buffer_len(&c->output) > 0) |
| 683 | FD_SET(c->sock, writeset); |
| 684 | } |
| 685 | |
| 686 | void |
| 687 | channel_pre_open_15(Channel *c, fd_set * readset, fd_set * writeset) |
| 688 | { |
| 689 | /* test whether sockets are 'alive' for read/write */ |
| 690 | if (c->istate == CHAN_INPUT_OPEN) |
| 691 | if (buffer_len(&c->input) < packet_get_maxsize()) |
| 692 | FD_SET(c->sock, readset); |
| 693 | if (c->ostate == CHAN_OUTPUT_OPEN || |
| 694 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { |
| 695 | if (buffer_len(&c->output) > 0) { |
| 696 | FD_SET(c->sock, writeset); |
| 697 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { |
| 698 | chan_obuf_empty(c); |
| 699 | } |
| 700 | } |
| 701 | } |
| 702 | |
| 703 | void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 704 | channel_pre_open_20(Channel *c, fd_set * readset, fd_set * writeset) |
| 705 | { |
| 706 | if (c->istate == CHAN_INPUT_OPEN && |
| 707 | c->remote_window > 0 && |
| 708 | buffer_len(&c->input) < c->remote_window) |
| 709 | FD_SET(c->rfd, readset); |
| 710 | if (c->ostate == CHAN_OUTPUT_OPEN || |
| 711 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { |
| 712 | if (buffer_len(&c->output) > 0) { |
| 713 | FD_SET(c->wfd, writeset); |
| 714 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { |
| 715 | chan_obuf_empty(c); |
| 716 | } |
| 717 | } |
| 718 | /** XXX check close conditions, too */ |
| 719 | if (c->efd != -1) { |
| 720 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
| 721 | buffer_len(&c->extended) > 0) |
| 722 | FD_SET(c->efd, writeset); |
| 723 | else if (c->extended_usage == CHAN_EXTENDED_READ && |
| 724 | buffer_len(&c->extended) < c->remote_window) |
| 725 | FD_SET(c->efd, readset); |
| 726 | } |
| 727 | } |
| 728 | |
| 729 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 730 | channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset) |
| 731 | { |
| 732 | if (buffer_len(&c->input) == 0) { |
| 733 | packet_start(SSH_MSG_CHANNEL_CLOSE); |
| 734 | packet_put_int(c->remote_id); |
| 735 | packet_send(); |
| 736 | c->type = SSH_CHANNEL_CLOSED; |
Ben Lindstrom | c486d88 | 2001-04-11 16:08:34 +0000 | [diff] [blame] | 737 | debug("channel %d: closing after input drain.", c->self); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 738 | } |
| 739 | } |
| 740 | |
| 741 | void |
| 742 | channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset) |
| 743 | { |
| 744 | if (buffer_len(&c->output) == 0) |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 745 | chan_mark_dead(c); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 746 | else |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 747 | FD_SET(c->sock, writeset); |
| 748 | } |
| 749 | |
| 750 | /* |
| 751 | * This is a special state for X11 authentication spoofing. An opened X11 |
| 752 | * connection (when authentication spoofing is being done) remains in this |
| 753 | * state until the first packet has been completely read. The authentication |
| 754 | * data in that packet is then substituted by the real data if it matches the |
| 755 | * fake data, and the channel is put into normal mode. |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 756 | * XXX All this happens at the client side. |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 757 | * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 758 | */ |
| 759 | int |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 760 | x11_open_helper(Buffer *b) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 761 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 762 | u_char *ucp; |
| 763 | u_int proto_len, data_len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 764 | |
| 765 | /* Check if the fixed size part of the packet is in buffer. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 766 | if (buffer_len(b) < 12) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 767 | return 0; |
| 768 | |
| 769 | /* Parse the lengths of variable-length fields. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 770 | ucp = (u_char *) buffer_ptr(b); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 771 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
| 772 | proto_len = 256 * ucp[6] + ucp[7]; |
| 773 | data_len = 256 * ucp[8] + ucp[9]; |
| 774 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ |
| 775 | proto_len = ucp[6] + 256 * ucp[7]; |
| 776 | data_len = ucp[8] + 256 * ucp[9]; |
| 777 | } else { |
| 778 | debug("Initial X11 packet contains bad byte order byte: 0x%x", |
| 779 | ucp[0]); |
| 780 | return -1; |
| 781 | } |
| 782 | |
| 783 | /* Check if the whole packet is in buffer. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 784 | if (buffer_len(b) < |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 785 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
| 786 | return 0; |
| 787 | |
| 788 | /* Check if authentication protocol matches. */ |
| 789 | if (proto_len != strlen(x11_saved_proto) || |
| 790 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { |
| 791 | debug("X11 connection uses different authentication protocol."); |
| 792 | return -1; |
| 793 | } |
| 794 | /* Check if authentication data matches our fake data. */ |
| 795 | if (data_len != x11_fake_data_len || |
| 796 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), |
| 797 | x11_fake_data, x11_fake_data_len) != 0) { |
| 798 | debug("X11 auth data does not match fake data."); |
| 799 | return -1; |
| 800 | } |
| 801 | /* Check fake data length */ |
| 802 | if (x11_fake_data_len != x11_saved_data_len) { |
| 803 | error("X11 fake_data_len %d != saved_data_len %d", |
| 804 | x11_fake_data_len, x11_saved_data_len); |
| 805 | return -1; |
| 806 | } |
| 807 | /* |
| 808 | * Received authentication protocol and data match |
| 809 | * our fake data. Substitute the fake data with real |
| 810 | * data. |
| 811 | */ |
| 812 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), |
| 813 | x11_saved_data, x11_saved_data_len); |
| 814 | return 1; |
| 815 | } |
| 816 | |
| 817 | void |
| 818 | channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset) |
| 819 | { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 820 | int ret = x11_open_helper(&c->output); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 821 | if (ret == 1) { |
| 822 | /* Start normal processing for the channel. */ |
| 823 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | 7892879 | 2000-04-12 20:17:38 +1000 | [diff] [blame] | 824 | channel_pre_open_13(c, readset, writeset); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 825 | } else if (ret == -1) { |
| 826 | /* |
| 827 | * We have received an X11 connection that has bad |
| 828 | * authentication information. |
| 829 | */ |
Ben Lindstrom | 6df8ef4 | 2001-03-05 07:47:23 +0000 | [diff] [blame] | 830 | log("X11 connection rejected because of wrong authentication."); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 831 | buffer_clear(&c->input); |
| 832 | buffer_clear(&c->output); |
| 833 | close(c->sock); |
| 834 | c->sock = -1; |
| 835 | c->type = SSH_CHANNEL_CLOSED; |
| 836 | packet_start(SSH_MSG_CHANNEL_CLOSE); |
| 837 | packet_put_int(c->remote_id); |
| 838 | packet_send(); |
| 839 | } |
| 840 | } |
| 841 | |
| 842 | void |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 843 | channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 844 | { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 845 | int ret = x11_open_helper(&c->output); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 846 | if (ret == 1) { |
| 847 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 848 | if (compat20) |
| 849 | channel_pre_open_20(c, readset, writeset); |
| 850 | else |
| 851 | channel_pre_open_15(c, readset, writeset); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 852 | } else if (ret == -1) { |
| 853 | debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 854 | chan_read_failed(c); /** force close? */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 855 | chan_write_failed(c); |
| 856 | debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
| 857 | } |
| 858 | } |
| 859 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 860 | /* try to decode a socks4 header */ |
| 861 | int |
| 862 | channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset) |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 863 | { |
| 864 | u_char *p, *host; |
Ben Lindstrom | 2b261b9 | 2001-04-17 18:14:34 +0000 | [diff] [blame] | 865 | int len, have, i, found; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 866 | char username[256]; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 867 | struct { |
| 868 | u_int8_t version; |
| 869 | u_int8_t command; |
| 870 | u_int16_t dest_port; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 871 | struct in_addr dest_addr; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 872 | } s4_req, s4_rsp; |
| 873 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 874 | debug2("channel %d: decode socks4", c->self); |
Ben Lindstrom | 2b261b9 | 2001-04-17 18:14:34 +0000 | [diff] [blame] | 875 | |
| 876 | have = buffer_len(&c->input); |
| 877 | len = sizeof(s4_req); |
| 878 | if (have < len) |
| 879 | return 0; |
| 880 | p = buffer_ptr(&c->input); |
| 881 | for (found = 0, i = len; i < have; i++) { |
| 882 | if (p[i] == '\0') { |
| 883 | found = 1; |
| 884 | break; |
| 885 | } |
| 886 | if (i > 1024) { |
| 887 | /* the peer is probably sending garbage */ |
| 888 | debug("channel %d: decode socks4: too long", |
| 889 | c->self); |
| 890 | return -1; |
| 891 | } |
| 892 | } |
| 893 | if (!found) |
| 894 | return 0; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 895 | buffer_get(&c->input, (char *)&s4_req.version, 1); |
| 896 | buffer_get(&c->input, (char *)&s4_req.command, 1); |
| 897 | buffer_get(&c->input, (char *)&s4_req.dest_port, 2); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 898 | buffer_get(&c->input, (char *)&s4_req.dest_addr, 4); |
Ben Lindstrom | 2b261b9 | 2001-04-17 18:14:34 +0000 | [diff] [blame] | 899 | have = buffer_len(&c->input); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 900 | p = buffer_ptr(&c->input); |
| 901 | len = strlen(p); |
Ben Lindstrom | 6fa9d10 | 2001-04-11 23:08:17 +0000 | [diff] [blame] | 902 | debug2("channel %d: decode socks4: user %s/%d", c->self, p, len); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 903 | if (len > have) |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 904 | fatal("channel %d: decode socks4: len %d > have %d", |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 905 | c->self, len, have); |
| 906 | strlcpy(username, p, sizeof(username)); |
| 907 | buffer_consume(&c->input, len); |
| 908 | buffer_consume(&c->input, 1); /* trailing '\0' */ |
| 909 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 910 | host = inet_ntoa(s4_req.dest_addr); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 911 | strlcpy(c->path, host, sizeof(c->path)); |
| 912 | c->host_port = ntohs(s4_req.dest_port); |
| 913 | |
Ben Lindstrom | 6fa9d10 | 2001-04-11 23:08:17 +0000 | [diff] [blame] | 914 | debug("channel %d: dynamic request: socks4 host %s port %u command %u", |
| 915 | c->self, host, c->host_port, s4_req.command); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 916 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 917 | if (s4_req.command != 1) { |
| 918 | debug("channel %d: cannot handle: socks4 cn %d", |
| 919 | c->self, s4_req.command); |
| 920 | return -1; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 921 | } |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 922 | s4_rsp.version = 0; /* vn: 0 for reply */ |
| 923 | s4_rsp.command = 90; /* cd: req granted */ |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 924 | s4_rsp.dest_port = 0; /* ignored */ |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 925 | s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */ |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 926 | buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp)); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 927 | return 1; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 928 | } |
| 929 | |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 930 | /* dynamic port forwarding */ |
| 931 | void |
| 932 | channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset) |
| 933 | { |
| 934 | u_char *p; |
| 935 | int have, ret; |
| 936 | |
| 937 | have = buffer_len(&c->input); |
| 938 | |
| 939 | debug2("channel %d: pre_dynamic: have %d", c->self, have); |
Ben Lindstrom | c486d88 | 2001-04-11 16:08:34 +0000 | [diff] [blame] | 940 | /* buffer_dump(&c->input); */ |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 941 | /* check if the fixed size part of the packet is in buffer. */ |
| 942 | if (have < 4) { |
| 943 | /* need more */ |
| 944 | FD_SET(c->sock, readset); |
| 945 | return; |
| 946 | } |
| 947 | /* try to guess the protocol */ |
| 948 | p = buffer_ptr(&c->input); |
| 949 | switch (p[0]) { |
Ben Lindstrom | 6fa9d10 | 2001-04-11 23:08:17 +0000 | [diff] [blame] | 950 | case 0x04: |
| 951 | ret = channel_decode_socks4(c, readset, writeset); |
| 952 | break; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 953 | default: |
| 954 | ret = -1; |
| 955 | break; |
| 956 | } |
| 957 | if (ret < 0) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 958 | chan_mark_dead(c); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 959 | } else if (ret == 0) { |
| 960 | debug2("channel %d: pre_dynamic: need more", c->self); |
| 961 | /* need more */ |
| 962 | FD_SET(c->sock, readset); |
| 963 | } else { |
| 964 | /* switch to the next state */ |
| 965 | c->type = SSH_CHANNEL_OPENING; |
| 966 | port_open_helper(c, "direct-tcpip"); |
| 967 | } |
| 968 | } |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 969 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 970 | /* This is our fake X11 server socket. */ |
| 971 | void |
| 972 | channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 973 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 974 | Channel *nc; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 975 | struct sockaddr addr; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 976 | int newsock; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 977 | socklen_t addrlen; |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 978 | char buf[16384], *remote_ipaddr; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 979 | int remote_port; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 980 | |
| 981 | if (FD_ISSET(c->sock, readset)) { |
| 982 | debug("X11 connection requested."); |
| 983 | addrlen = sizeof(addr); |
| 984 | newsock = accept(c->sock, &addr, &addrlen); |
| 985 | if (newsock < 0) { |
| 986 | error("accept: %.100s", strerror(errno)); |
| 987 | return; |
| 988 | } |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 989 | remote_ipaddr = get_peer_ipaddr(newsock); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 990 | remote_port = get_peer_port(newsock); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 991 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 992 | remote_ipaddr, remote_port); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 993 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 994 | nc = channel_new("accepted x11 socket", |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 995 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
| 996 | c->local_window_max, c->local_maxpacket, |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 997 | 0, xstrdup(buf), 1); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 998 | if (nc == NULL) { |
| 999 | close(newsock); |
| 1000 | xfree(remote_ipaddr); |
| 1001 | return; |
| 1002 | } |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1003 | if (compat20) { |
| 1004 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 1005 | packet_put_cstring("x11"); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1006 | packet_put_int(nc->self); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1007 | packet_put_int(c->local_window_max); |
| 1008 | packet_put_int(c->local_maxpacket); |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1009 | /* originator ipaddr and port */ |
| 1010 | packet_put_cstring(remote_ipaddr); |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 1011 | if (datafellows & SSH_BUG_X11FWD) { |
| 1012 | debug("ssh2 x11 bug compat mode"); |
| 1013 | } else { |
| 1014 | packet_put_int(remote_port); |
| 1015 | } |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1016 | packet_send(); |
| 1017 | } else { |
| 1018 | packet_start(SSH_SMSG_X11_OPEN); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1019 | packet_put_int(nc->self); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1020 | if (packet_get_protocol_flags() & |
| 1021 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1022 | packet_put_string(buf, strlen(buf)); |
| 1023 | packet_send(); |
| 1024 | } |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 1025 | xfree(remote_ipaddr); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1026 | } |
| 1027 | } |
| 1028 | |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1029 | void |
| 1030 | port_open_helper(Channel *c, char *rtype) |
| 1031 | { |
| 1032 | int direct; |
| 1033 | char buf[1024]; |
| 1034 | char *remote_ipaddr = get_peer_ipaddr(c->sock); |
| 1035 | u_short remote_port = get_peer_port(c->sock); |
| 1036 | |
| 1037 | direct = (strcmp(rtype, "direct-tcpip") == 0); |
| 1038 | |
| 1039 | snprintf(buf, sizeof buf, |
| 1040 | "%s: listening port %d for %.100s port %d, " |
| 1041 | "connect from %.200s port %d", |
| 1042 | rtype, c->listening_port, c->path, c->host_port, |
| 1043 | remote_ipaddr, remote_port); |
| 1044 | |
| 1045 | xfree(c->remote_name); |
| 1046 | c->remote_name = xstrdup(buf); |
| 1047 | |
| 1048 | if (compat20) { |
| 1049 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 1050 | packet_put_cstring(rtype); |
| 1051 | packet_put_int(c->self); |
| 1052 | packet_put_int(c->local_window_max); |
| 1053 | packet_put_int(c->local_maxpacket); |
| 1054 | if (direct) { |
| 1055 | /* target host, port */ |
| 1056 | packet_put_cstring(c->path); |
| 1057 | packet_put_int(c->host_port); |
| 1058 | } else { |
| 1059 | /* listen address, port */ |
| 1060 | packet_put_cstring(c->path); |
| 1061 | packet_put_int(c->listening_port); |
| 1062 | } |
| 1063 | /* originator host and port */ |
| 1064 | packet_put_cstring(remote_ipaddr); |
| 1065 | packet_put_int(remote_port); |
| 1066 | packet_send(); |
| 1067 | } else { |
| 1068 | packet_start(SSH_MSG_PORT_OPEN); |
| 1069 | packet_put_int(c->self); |
| 1070 | packet_put_cstring(c->path); |
| 1071 | packet_put_int(c->host_port); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1072 | if (packet_get_protocol_flags() & |
| 1073 | SSH_PROTOFLAG_HOST_IN_FWD_OPEN) |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1074 | packet_put_cstring(c->remote_name); |
| 1075 | packet_send(); |
| 1076 | } |
| 1077 | xfree(remote_ipaddr); |
| 1078 | } |
| 1079 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1080 | /* |
| 1081 | * This socket is listening for connections to a forwarded TCP/IP port. |
| 1082 | */ |
| 1083 | void |
| 1084 | channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 1085 | { |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1086 | Channel *nc; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1087 | struct sockaddr addr; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1088 | int newsock, nextstate; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1089 | socklen_t addrlen; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1090 | char *rtype; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1091 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1092 | if (FD_ISSET(c->sock, readset)) { |
| 1093 | debug("Connection to port %d forwarding " |
| 1094 | "to %.100s port %d requested.", |
| 1095 | c->listening_port, c->path, c->host_port); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1096 | |
| 1097 | rtype = (c->type == SSH_CHANNEL_RPORT_LISTENER) ? |
| 1098 | "forwarded-tcpip" : "direct-tcpip"; |
Ben Lindstrom | 6d61846 | 2001-05-10 23:24:49 +0000 | [diff] [blame] | 1099 | nextstate = (c->host_port == 0 && |
| 1100 | c->type != SSH_CHANNEL_RPORT_LISTENER) ? |
| 1101 | SSH_CHANNEL_DYNAMIC : SSH_CHANNEL_OPENING; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1102 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1103 | addrlen = sizeof(addr); |
| 1104 | newsock = accept(c->sock, &addr, &addrlen); |
| 1105 | if (newsock < 0) { |
| 1106 | error("accept: %.100s", strerror(errno)); |
| 1107 | return; |
| 1108 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1109 | nc = channel_new(rtype, |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1110 | nextstate, newsock, newsock, -1, |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1111 | c->local_window_max, c->local_maxpacket, |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1112 | 0, xstrdup(rtype), 1); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1113 | if (nc == NULL) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1114 | error("channel_post_port_listener: no new channel:"); |
| 1115 | close(newsock); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1116 | return; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1117 | } |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1118 | nc->listening_port = c->listening_port; |
| 1119 | nc->host_port = c->host_port; |
| 1120 | strlcpy(nc->path, c->path, sizeof(nc->path)); |
| 1121 | |
| 1122 | if (nextstate != SSH_CHANNEL_DYNAMIC) |
| 1123 | port_open_helper(nc, rtype); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1124 | } |
| 1125 | } |
| 1126 | |
| 1127 | /* |
| 1128 | * This is the authentication agent socket listening for connections from |
| 1129 | * clients. |
| 1130 | */ |
| 1131 | void |
| 1132 | channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 1133 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1134 | Channel *nc; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1135 | char *name; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1136 | int newsock; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1137 | struct sockaddr addr; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1138 | socklen_t addrlen; |
| 1139 | |
| 1140 | if (FD_ISSET(c->sock, readset)) { |
| 1141 | addrlen = sizeof(addr); |
| 1142 | newsock = accept(c->sock, &addr, &addrlen); |
| 1143 | if (newsock < 0) { |
| 1144 | error("accept from auth socket: %.100s", strerror(errno)); |
| 1145 | return; |
| 1146 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1147 | name = xstrdup("accepted auth socket"); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1148 | nc = channel_new("accepted auth socket", |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1149 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
| 1150 | c->local_window_max, c->local_maxpacket, |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1151 | 0, name, 1); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1152 | if (nc == NULL) { |
| 1153 | error("channel_post_auth_listener: channel_new failed"); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1154 | xfree(name); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1155 | close(newsock); |
| 1156 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1157 | if (compat20) { |
| 1158 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 1159 | packet_put_cstring("auth-agent@openssh.com"); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1160 | packet_put_int(nc->self); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1161 | packet_put_int(c->local_window_max); |
| 1162 | packet_put_int(c->local_maxpacket); |
| 1163 | } else { |
| 1164 | packet_start(SSH_SMSG_AGENT_OPEN); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1165 | packet_put_int(nc->self); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1166 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1167 | packet_send(); |
| 1168 | } |
| 1169 | } |
| 1170 | |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1171 | void |
| 1172 | channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset) |
| 1173 | { |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1174 | int err = 0; |
| 1175 | int sz = sizeof(err); |
| 1176 | |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1177 | if (FD_ISSET(c->sock, writeset)) { |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1178 | if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, (char *)&err, |
| 1179 | &sz) < 0) { |
| 1180 | err = errno; |
| 1181 | error("getsockopt SO_ERROR failed"); |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1182 | } |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1183 | if (err == 0) { |
| 1184 | debug("channel %d: connected", c->self); |
| 1185 | c->type = SSH_CHANNEL_OPEN; |
| 1186 | if (compat20) { |
| 1187 | packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1188 | packet_put_int(c->remote_id); |
| 1189 | packet_put_int(c->self); |
| 1190 | packet_put_int(c->local_window); |
| 1191 | packet_put_int(c->local_maxpacket); |
| 1192 | } else { |
| 1193 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1194 | packet_put_int(c->remote_id); |
| 1195 | packet_put_int(c->self); |
| 1196 | } |
| 1197 | } else { |
| 1198 | debug("channel %d: not connected: %s", |
| 1199 | c->self, strerror(err)); |
| 1200 | if (compat20) { |
| 1201 | packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE); |
| 1202 | packet_put_int(c->remote_id); |
| 1203 | packet_put_int(SSH2_OPEN_CONNECT_FAILED); |
| 1204 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
| 1205 | packet_put_cstring(strerror(err)); |
| 1206 | packet_put_cstring(""); |
| 1207 | } |
| 1208 | } else { |
| 1209 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 1210 | packet_put_int(c->remote_id); |
| 1211 | } |
| 1212 | chan_mark_dead(c); |
| 1213 | } |
| 1214 | packet_send(); |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1215 | } |
| 1216 | } |
| 1217 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1218 | int |
| 1219 | channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset) |
| 1220 | { |
| 1221 | char buf[16*1024]; |
| 1222 | int len; |
| 1223 | |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 1224 | if (c->rfd != -1 && |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1225 | FD_ISSET(c->rfd, readset)) { |
| 1226 | len = read(c->rfd, buf, sizeof(buf)); |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 1227 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
| 1228 | return 1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1229 | if (len <= 0) { |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1230 | debug("channel %d: read<=0 rfd %d len %d", |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1231 | c->self, c->rfd, len); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1232 | if (c->type != SSH_CHANNEL_OPEN) { |
| 1233 | debug("channel %d: not open", c->self); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1234 | chan_mark_dead(c); |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1235 | return -1; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1236 | } else if (compat13) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1237 | buffer_consume(&c->output, buffer_len(&c->output)); |
| 1238 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1239 | debug("channel %d: input draining.", c->self); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1240 | } else { |
| 1241 | chan_read_failed(c); |
| 1242 | } |
| 1243 | return -1; |
| 1244 | } |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1245 | if(c->input_filter != NULL) { |
| 1246 | if (c->input_filter(c, buf, len) == -1) { |
Ben Lindstrom | c486d88 | 2001-04-11 16:08:34 +0000 | [diff] [blame] | 1247 | debug("channel %d: filter stops", c->self); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1248 | chan_read_failed(c); |
| 1249 | } |
| 1250 | } else { |
| 1251 | buffer_append(&c->input, buf, len); |
| 1252 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1253 | } |
| 1254 | return 1; |
| 1255 | } |
| 1256 | int |
| 1257 | channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset) |
| 1258 | { |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 1259 | struct termios tio; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1260 | int len; |
| 1261 | |
| 1262 | /* Send buffered output data to the socket. */ |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 1263 | if (c->wfd != -1 && |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1264 | FD_ISSET(c->wfd, writeset) && |
| 1265 | buffer_len(&c->output) > 0) { |
| 1266 | len = write(c->wfd, buffer_ptr(&c->output), |
Damien Miller | 6f83b8e | 2000-05-02 09:23:45 +1000 | [diff] [blame] | 1267 | buffer_len(&c->output)); |
| 1268 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
| 1269 | return 1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1270 | if (len <= 0) { |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1271 | if (c->type != SSH_CHANNEL_OPEN) { |
| 1272 | debug("channel %d: not open", c->self); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1273 | chan_mark_dead(c); |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1274 | return -1; |
| 1275 | } else if (compat13) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1276 | buffer_consume(&c->output, buffer_len(&c->output)); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1277 | debug("channel %d: input draining.", c->self); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1278 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
| 1279 | } else { |
| 1280 | chan_write_failed(c); |
| 1281 | } |
| 1282 | return -1; |
| 1283 | } |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1284 | if (compat20 && c->isatty) { |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1285 | if (tcgetattr(c->wfd, &tio) == 0 && |
| 1286 | !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) { |
| 1287 | /* |
| 1288 | * Simulate echo to reduce the impact of |
Ben Lindstrom | b40204b | 2001-03-05 06:29:44 +0000 | [diff] [blame] | 1289 | * traffic analysis. We need to match the |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 1290 | * size of a SSH2_MSG_CHANNEL_DATA message |
| 1291 | * (4 byte channel id + data) |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1292 | */ |
Ben Lindstrom | e229b25 | 2001-03-05 06:28:06 +0000 | [diff] [blame] | 1293 | packet_send_ignore(4 + len); |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1294 | packet_send(); |
Damien Miller | 79438cc | 2001-02-16 12:34:57 +1100 | [diff] [blame] | 1295 | } |
| 1296 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1297 | buffer_consume(&c->output, len); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1298 | if (compat20 && len > 0) { |
| 1299 | c->local_consumed += len; |
| 1300 | } |
| 1301 | } |
| 1302 | return 1; |
| 1303 | } |
| 1304 | int |
| 1305 | channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset) |
| 1306 | { |
| 1307 | char buf[16*1024]; |
| 1308 | int len; |
| 1309 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1310 | /** XXX handle drain efd, too */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1311 | if (c->efd != -1) { |
| 1312 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
| 1313 | FD_ISSET(c->efd, writeset) && |
| 1314 | buffer_len(&c->extended) > 0) { |
| 1315 | len = write(c->efd, buffer_ptr(&c->extended), |
| 1316 | buffer_len(&c->extended)); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1317 | debug2("channel %d: written %d to efd %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1318 | c->self, len, c->efd); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1319 | if (len < 0 && (errno == EINTR || errno == EAGAIN)) |
| 1320 | return 1; |
| 1321 | if (len <= 0) { |
| 1322 | debug2("channel %d: closing write-efd %d", |
| 1323 | c->self, c->efd); |
| 1324 | close(c->efd); |
| 1325 | c->efd = -1; |
| 1326 | } else { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1327 | buffer_consume(&c->extended, len); |
| 1328 | c->local_consumed += len; |
| 1329 | } |
| 1330 | } else if (c->extended_usage == CHAN_EXTENDED_READ && |
| 1331 | FD_ISSET(c->efd, readset)) { |
| 1332 | len = read(c->efd, buf, sizeof(buf)); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1333 | debug2("channel %d: read %d from 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 read-efd %d", |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 1339 | c->self, c->efd); |
| 1340 | close(c->efd); |
| 1341 | c->efd = -1; |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1342 | } else { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1343 | buffer_append(&c->extended, buf, len); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1344 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1345 | } |
| 1346 | } |
| 1347 | return 1; |
| 1348 | } |
| 1349 | int |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1350 | channel_check_window(Channel *c) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1351 | { |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1352 | if (c->type == SSH_CHANNEL_OPEN && |
| 1353 | !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) && |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1354 | c->local_window < c->local_window_max/2 && |
| 1355 | c->local_consumed > 0) { |
| 1356 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
| 1357 | packet_put_int(c->remote_id); |
| 1358 | packet_put_int(c->local_consumed); |
| 1359 | packet_send(); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1360 | debug2("channel %d: window %d sent adjust %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1361 | c->self, c->local_window, |
| 1362 | c->local_consumed); |
| 1363 | c->local_window += c->local_consumed; |
| 1364 | c->local_consumed = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1365 | } |
| 1366 | return 1; |
| 1367 | } |
| 1368 | |
| 1369 | void |
| 1370 | channel_post_open_1(Channel *c, fd_set * readset, fd_set * writeset) |
| 1371 | { |
| 1372 | channel_handle_rfd(c, readset, writeset); |
| 1373 | channel_handle_wfd(c, readset, writeset); |
| 1374 | } |
| 1375 | |
| 1376 | void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1377 | channel_post_open_2(Channel *c, fd_set * readset, fd_set * writeset) |
| 1378 | { |
| 1379 | channel_handle_rfd(c, readset, writeset); |
| 1380 | channel_handle_wfd(c, readset, writeset); |
| 1381 | channel_handle_efd(c, readset, writeset); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1382 | |
| 1383 | channel_check_window(c); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1384 | } |
| 1385 | |
| 1386 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1387 | channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset) |
| 1388 | { |
| 1389 | int len; |
| 1390 | /* Send buffered output data to the socket. */ |
| 1391 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { |
| 1392 | len = write(c->sock, buffer_ptr(&c->output), |
| 1393 | buffer_len(&c->output)); |
| 1394 | if (len <= 0) |
| 1395 | buffer_consume(&c->output, buffer_len(&c->output)); |
| 1396 | else |
| 1397 | buffer_consume(&c->output, len); |
| 1398 | } |
| 1399 | } |
| 1400 | |
| 1401 | void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1402 | channel_handler_init_20(void) |
| 1403 | { |
| 1404 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_20; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1405 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1406 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1407 | channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1408 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1409 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1410 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1411 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1412 | |
| 1413 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_2; |
| 1414 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1415 | channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1416 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1417 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1418 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1419 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_2; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1420 | } |
| 1421 | |
| 1422 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1423 | channel_handler_init_13(void) |
| 1424 | { |
| 1425 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; |
| 1426 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; |
| 1427 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
| 1428 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
| 1429 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
| 1430 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; |
| 1431 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1432 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1433 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1434 | |
| 1435 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1; |
| 1436 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
| 1437 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
| 1438 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
| 1439 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1440 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1441 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1442 | } |
| 1443 | |
| 1444 | void |
| 1445 | channel_handler_init_15(void) |
| 1446 | { |
| 1447 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_15; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1448 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1449 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
| 1450 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
| 1451 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1452 | channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting; |
Ben Lindstrom | 3bb4f9d | 2001-04-08 18:30:26 +0000 | [diff] [blame] | 1453 | channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1454 | |
| 1455 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
| 1456 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
| 1457 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
| 1458 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1; |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 1459 | channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting; |
Ben Lindstrom | b392151 | 2001-04-11 15:57:50 +0000 | [diff] [blame] | 1460 | channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1461 | } |
| 1462 | |
| 1463 | void |
| 1464 | channel_handler_init(void) |
| 1465 | { |
| 1466 | int i; |
| 1467 | for(i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
| 1468 | channel_pre[i] = NULL; |
| 1469 | channel_post[i] = NULL; |
| 1470 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1471 | if (compat20) |
| 1472 | channel_handler_init_20(); |
| 1473 | else if (compat13) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1474 | channel_handler_init_13(); |
| 1475 | else |
| 1476 | channel_handler_init_15(); |
| 1477 | } |
| 1478 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1479 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1480 | channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset) |
| 1481 | { |
| 1482 | static int did_init = 0; |
| 1483 | int i; |
| 1484 | Channel *c; |
| 1485 | |
| 1486 | if (!did_init) { |
| 1487 | channel_handler_init(); |
| 1488 | did_init = 1; |
| 1489 | } |
| 1490 | for (i = 0; i < channels_alloc; i++) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1491 | c = channels[i]; |
| 1492 | if (c == NULL) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1493 | continue; |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 1494 | if (ftab[c->type] != NULL) |
| 1495 | (*ftab[c->type])(c, readset, writeset); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1496 | if (chan_is_dead(c)) { |
| 1497 | /* |
| 1498 | * we have to remove the fd's from the select mask |
| 1499 | * before the channels are free'd and the fd's are |
| 1500 | * closed |
| 1501 | */ |
| 1502 | if (c->wfd != -1) |
| 1503 | FD_CLR(c->wfd, writeset); |
| 1504 | if (c->rfd != -1) |
| 1505 | FD_CLR(c->rfd, readset); |
| 1506 | if (c->efd != -1) { |
| 1507 | if (c->extended_usage == CHAN_EXTENDED_READ) |
| 1508 | FD_CLR(c->efd, readset); |
| 1509 | if (c->extended_usage == CHAN_EXTENDED_WRITE) |
| 1510 | FD_CLR(c->efd, writeset); |
| 1511 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1512 | channel_free(c); |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1513 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1514 | } |
| 1515 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1516 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1517 | /* |
| 1518 | * Allocate/update select bitmasks and add any bits relevant to channels in |
| 1519 | * select bitmasks. |
| 1520 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1521 | void |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 1522 | channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp, |
| 1523 | int rekeying) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1524 | { |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1525 | int n; |
| 1526 | u_int sz; |
| 1527 | |
| 1528 | n = MAX(*maxfdp, channel_max_fd); |
| 1529 | |
| 1530 | sz = howmany(n+1, NFDBITS) * sizeof(fd_mask); |
| 1531 | if (*readsetp == NULL || n > *maxfdp) { |
| 1532 | if (*readsetp) |
| 1533 | xfree(*readsetp); |
| 1534 | if (*writesetp) |
| 1535 | xfree(*writesetp); |
| 1536 | *readsetp = xmalloc(sz); |
| 1537 | *writesetp = xmalloc(sz); |
| 1538 | *maxfdp = n; |
| 1539 | } |
| 1540 | memset(*readsetp, 0, sz); |
| 1541 | memset(*writesetp, 0, sz); |
| 1542 | |
Ben Lindstrom | be2cc43 | 2001-04-04 23:46:07 +0000 | [diff] [blame] | 1543 | if (!rekeying) |
| 1544 | channel_handler(channel_pre, *readsetp, *writesetp); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1545 | } |
| 1546 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1547 | /* |
| 1548 | * After select, perform any appropriate operations for channels which have |
| 1549 | * events pending. |
| 1550 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1551 | void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1552 | channel_after_select(fd_set * readset, fd_set * writeset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1553 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1554 | channel_handler(channel_post, readset, writeset); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1555 | } |
| 1556 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1557 | |
Damien Miller | 5e95321 | 2001-01-30 09:14:00 +1100 | [diff] [blame] | 1558 | /* 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] | 1559 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1560 | void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1561 | channel_output_poll() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1562 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1563 | int len, i; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1564 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1565 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1566 | for (i = 0; i < channels_alloc; i++) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1567 | c = channels[i]; |
| 1568 | if (c == NULL) |
| 1569 | continue; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1570 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1571 | /* |
| 1572 | * We are only interested in channels that can have buffered |
| 1573 | * incoming data. |
| 1574 | */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1575 | if (compat13) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1576 | if (c->type != SSH_CHANNEL_OPEN && |
| 1577 | c->type != SSH_CHANNEL_INPUT_DRAINING) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1578 | continue; |
| 1579 | } else { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1580 | if (c->type != SSH_CHANNEL_OPEN) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1581 | continue; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1582 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1583 | if (compat20 && |
| 1584 | (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) { |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1585 | /* XXX is this true? */ |
Ben Lindstrom | b1131e9 | 2001-03-05 07:27:13 +0000 | [diff] [blame] | 1586 | debug2("channel %d: no data after CLOSE", c->self); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1587 | continue; |
| 1588 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1589 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1590 | /* Get the amount of buffered data for this channel. */ |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1591 | if ((c->istate == CHAN_INPUT_OPEN || |
| 1592 | c->istate == CHAN_INPUT_WAIT_DRAIN) && |
| 1593 | (len = buffer_len(&c->input)) > 0) { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1594 | /* |
| 1595 | * Send some data for the other side over the secure |
| 1596 | * connection. |
| 1597 | */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1598 | if (compat20) { |
| 1599 | if (len > c->remote_window) |
| 1600 | len = c->remote_window; |
| 1601 | if (len > c->remote_maxpacket) |
| 1602 | len = c->remote_maxpacket; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1603 | } else { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1604 | if (packet_is_interactive()) { |
| 1605 | if (len > 1024) |
| 1606 | len = 512; |
| 1607 | } else { |
| 1608 | /* Keep the packets at reasonable size. */ |
| 1609 | if (len > packet_get_maxsize()/2) |
| 1610 | len = packet_get_maxsize()/2; |
| 1611 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1612 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1613 | if (len > 0) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1614 | packet_start(compat20 ? |
| 1615 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1616 | packet_put_int(c->remote_id); |
| 1617 | packet_put_string(buffer_ptr(&c->input), len); |
| 1618 | packet_send(); |
| 1619 | buffer_consume(&c->input, len); |
| 1620 | c->remote_window -= len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1621 | } |
| 1622 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1623 | if (compat13) |
| 1624 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1625 | /* |
| 1626 | * input-buffer is empty and read-socket shutdown: |
| 1627 | * tell peer, that we will not send more data: send IEOF |
| 1628 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1629 | chan_ibuf_empty(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1630 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1631 | /* Send extended data, i.e. stderr */ |
| 1632 | if (compat20 && |
| 1633 | c->remote_window > 0 && |
| 1634 | (len = buffer_len(&c->extended)) > 0 && |
| 1635 | c->extended_usage == CHAN_EXTENDED_READ) { |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1636 | debug2("channel %d: rwin %d elen %d euse %d", |
| 1637 | c->self, c->remote_window, buffer_len(&c->extended), |
| 1638 | c->extended_usage); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1639 | if (len > c->remote_window) |
| 1640 | len = c->remote_window; |
| 1641 | if (len > c->remote_maxpacket) |
| 1642 | len = c->remote_maxpacket; |
| 1643 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); |
| 1644 | packet_put_int(c->remote_id); |
| 1645 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); |
| 1646 | packet_put_string(buffer_ptr(&c->extended), len); |
| 1647 | packet_send(); |
| 1648 | buffer_consume(&c->extended, len); |
| 1649 | c->remote_window -= len; |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 1650 | debug2("channel %d: sent ext data %d", c->self, len); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1651 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1652 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1653 | } |
| 1654 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1655 | |
| 1656 | /* -- protocol input */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1657 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1658 | void |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1659 | channel_input_data(int type, int plen, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1660 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1661 | int id; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1662 | char *data; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1663 | u_int data_len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1664 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1665 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1666 | /* Get the channel number and verify it. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1667 | id = packet_get_int(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1668 | c = channel_lookup(id); |
| 1669 | if (c == NULL) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1670 | packet_disconnect("Received data for nonexistent channel %d.", id); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1671 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1672 | /* Ignore any data for non-open channels (might happen on close) */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1673 | if (c->type != SSH_CHANNEL_OPEN && |
| 1674 | c->type != SSH_CHANNEL_X11_OPEN) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1675 | return; |
| 1676 | |
| 1677 | /* same for protocol 1.5 if output end is no longer open */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1678 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1679 | return; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1680 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1681 | /* Get the data. */ |
| 1682 | data = packet_get_string(&data_len); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1683 | packet_done(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1684 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1685 | if (compat20){ |
| 1686 | if (data_len > c->local_maxpacket) { |
| 1687 | log("channel %d: rcvd big packet %d, maxpack %d", |
| 1688 | c->self, data_len, c->local_maxpacket); |
| 1689 | } |
| 1690 | if (data_len > c->local_window) { |
| 1691 | log("channel %d: rcvd too much data %d, win %d", |
| 1692 | c->self, data_len, c->local_window); |
| 1693 | xfree(data); |
| 1694 | return; |
| 1695 | } |
| 1696 | c->local_window -= data_len; |
| 1697 | }else{ |
| 1698 | packet_integrity_check(plen, 4 + 4 + data_len, type); |
| 1699 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1700 | buffer_append(&c->output, data, data_len); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1701 | xfree(data); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1702 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1703 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1704 | void |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1705 | channel_input_extended_data(int type, int plen, void *ctxt) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1706 | { |
| 1707 | int id; |
| 1708 | int tcode; |
| 1709 | char *data; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1710 | u_int data_len; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1711 | Channel *c; |
| 1712 | |
| 1713 | /* Get the channel number and verify it. */ |
| 1714 | id = packet_get_int(); |
| 1715 | c = channel_lookup(id); |
| 1716 | |
| 1717 | if (c == NULL) |
| 1718 | packet_disconnect("Received extended_data for bad channel %d.", id); |
| 1719 | if (c->type != SSH_CHANNEL_OPEN) { |
| 1720 | log("channel %d: ext data for non open", id); |
| 1721 | return; |
| 1722 | } |
| 1723 | tcode = packet_get_int(); |
| 1724 | if (c->efd == -1 || |
| 1725 | c->extended_usage != CHAN_EXTENDED_WRITE || |
| 1726 | tcode != SSH2_EXTENDED_DATA_STDERR) { |
| 1727 | log("channel %d: bad ext data", c->self); |
| 1728 | return; |
| 1729 | } |
| 1730 | data = packet_get_string(&data_len); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1731 | packet_done(); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1732 | if (data_len > c->local_window) { |
| 1733 | log("channel %d: rcvd too much extended_data %d, win %d", |
| 1734 | c->self, data_len, c->local_window); |
| 1735 | xfree(data); |
| 1736 | return; |
| 1737 | } |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1738 | debug2("channel %d: rcvd ext data %d", c->self, data_len); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1739 | c->local_window -= data_len; |
| 1740 | buffer_append(&c->extended, data, data_len); |
| 1741 | xfree(data); |
| 1742 | } |
| 1743 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1744 | void |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1745 | channel_input_ieof(int type, int plen, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1746 | { |
| 1747 | int id; |
| 1748 | Channel *c; |
| 1749 | |
| 1750 | packet_integrity_check(plen, 4, type); |
| 1751 | |
| 1752 | id = packet_get_int(); |
| 1753 | c = channel_lookup(id); |
| 1754 | if (c == NULL) |
| 1755 | packet_disconnect("Received ieof for nonexistent channel %d.", id); |
| 1756 | chan_rcvd_ieof(c); |
| 1757 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1758 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1759 | void |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1760 | channel_input_close(int type, int plen, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1761 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1762 | int id; |
| 1763 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1764 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1765 | packet_integrity_check(plen, 4, type); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1766 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1767 | id = packet_get_int(); |
| 1768 | c = channel_lookup(id); |
| 1769 | if (c == NULL) |
| 1770 | packet_disconnect("Received close for nonexistent channel %d.", id); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1771 | |
| 1772 | /* |
| 1773 | * Send a confirmation that we have closed the channel and no more |
| 1774 | * data is coming for it. |
| 1775 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1776 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1777 | packet_put_int(c->remote_id); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1778 | packet_send(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1779 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1780 | /* |
| 1781 | * If the channel is in closed state, we have sent a close request, |
| 1782 | * and the other side will eventually respond with a confirmation. |
| 1783 | * Thus, we cannot free the channel here, because then there would be |
| 1784 | * no-one to receive the confirmation. The channel gets freed when |
| 1785 | * the confirmation arrives. |
| 1786 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1787 | if (c->type != SSH_CHANNEL_CLOSED) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1788 | /* |
| 1789 | * Not a closed channel - mark it as draining, which will |
| 1790 | * cause it to be freed later. |
| 1791 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1792 | buffer_consume(&c->input, buffer_len(&c->input)); |
| 1793 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1794 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1795 | } |
| 1796 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1797 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1798 | void |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1799 | channel_input_oclose(int type, int plen, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1800 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1801 | int id = packet_get_int(); |
| 1802 | Channel *c = channel_lookup(id); |
| 1803 | packet_integrity_check(plen, 4, type); |
| 1804 | if (c == NULL) |
| 1805 | packet_disconnect("Received oclose for nonexistent channel %d.", id); |
| 1806 | chan_rcvd_oclose(c); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1807 | } |
| 1808 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1809 | void |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1810 | channel_input_close_confirmation(int type, int plen, void *ctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1811 | { |
| 1812 | int id = packet_get_int(); |
| 1813 | Channel *c = channel_lookup(id); |
| 1814 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1815 | packet_done(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1816 | if (c == NULL) |
| 1817 | packet_disconnect("Received close confirmation for " |
| 1818 | "out-of-range channel %d.", id); |
| 1819 | if (c->type != SSH_CHANNEL_CLOSED) |
| 1820 | packet_disconnect("Received close confirmation for " |
| 1821 | "non-closed channel %d (type %d).", id, c->type); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1822 | channel_free(c); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1823 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1824 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1825 | void |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1826 | channel_input_open_confirmation(int type, int plen, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1827 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1828 | int id, remote_id; |
| 1829 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1830 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1831 | if (!compat20) |
| 1832 | packet_integrity_check(plen, 4 + 4, type); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1833 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1834 | id = packet_get_int(); |
| 1835 | c = channel_lookup(id); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1836 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1837 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
| 1838 | packet_disconnect("Received open confirmation for " |
| 1839 | "non-opening channel %d.", id); |
| 1840 | remote_id = packet_get_int(); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1841 | /* 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] | 1842 | c->remote_id = remote_id; |
| 1843 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1844 | |
| 1845 | if (compat20) { |
| 1846 | c->remote_window = packet_get_int(); |
| 1847 | c->remote_maxpacket = packet_get_int(); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1848 | packet_done(); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1849 | if (c->cb_fn != NULL && c->cb_event == type) { |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1850 | debug2("callback start"); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1851 | c->cb_fn(c->self, c->cb_arg); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1852 | debug2("callback done"); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1853 | } |
| 1854 | debug("channel %d: open confirm rwindow %d rmax %d", c->self, |
| 1855 | c->remote_window, c->remote_maxpacket); |
| 1856 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1857 | } |
| 1858 | |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1859 | char * |
| 1860 | reason2txt(int reason) |
| 1861 | { |
| 1862 | switch(reason) { |
| 1863 | case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED: |
| 1864 | return "administratively prohibited"; |
| 1865 | case SSH2_OPEN_CONNECT_FAILED: |
| 1866 | return "connect failed"; |
| 1867 | case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE: |
| 1868 | return "unknown channel type"; |
| 1869 | case SSH2_OPEN_RESOURCE_SHORTAGE: |
| 1870 | return "resource shortage"; |
| 1871 | } |
Ben Lindstrom | e259544 | 2001-06-05 20:01:39 +0000 | [diff] [blame] | 1872 | return "unknown reason"; |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1873 | } |
| 1874 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1875 | void |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1876 | channel_input_open_failure(int type, int plen, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1877 | { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 1878 | int id, reason; |
| 1879 | char *msg = NULL, *lang = NULL; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1880 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1881 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1882 | if (!compat20) |
| 1883 | packet_integrity_check(plen, 4, type); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1884 | |
| 1885 | id = packet_get_int(); |
| 1886 | c = channel_lookup(id); |
| 1887 | |
| 1888 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
| 1889 | packet_disconnect("Received open failure for " |
| 1890 | "non-opening channel %d.", id); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1891 | if (compat20) { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 1892 | reason = packet_get_int(); |
Ben Lindstrom | f343674 | 2001-04-29 19:52:00 +0000 | [diff] [blame] | 1893 | if (!(datafellows & SSH_BUG_OPENFAILURE)) { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 1894 | msg = packet_get_string(NULL); |
| 1895 | lang = packet_get_string(NULL); |
| 1896 | } |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1897 | packet_done(); |
Ben Lindstrom | 6912866 | 2001-05-08 20:07:39 +0000 | [diff] [blame] | 1898 | log("channel %d: open failed: %s%s%s", id, |
| 1899 | reason2txt(reason), msg ? ": ": "", msg ? msg : ""); |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 1900 | if (msg != NULL) |
| 1901 | xfree(msg); |
| 1902 | if (lang != NULL) |
| 1903 | xfree(lang); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1904 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1905 | /* Free the channel. This will also close the socket. */ |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1906 | channel_free(c); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1907 | } |
| 1908 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1909 | void |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1910 | channel_input_channel_request(int type, int plen, void *ctxt) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1911 | { |
| 1912 | int id; |
| 1913 | Channel *c; |
| 1914 | |
| 1915 | id = packet_get_int(); |
| 1916 | c = channel_lookup(id); |
| 1917 | |
| 1918 | if (c == NULL || |
| 1919 | (c->type != SSH_CHANNEL_OPEN && c->type != SSH_CHANNEL_LARVAL)) |
| 1920 | packet_disconnect("Received request for " |
| 1921 | "non-open channel %d.", id); |
| 1922 | if (c->cb_fn != NULL && c->cb_event == type) { |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1923 | debug2("callback start"); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1924 | c->cb_fn(c->self, c->cb_arg); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1925 | debug2("callback done"); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1926 | } else { |
| 1927 | char *service = packet_get_string(NULL); |
Ben Lindstrom | cc74df7 | 2001-03-05 06:20:14 +0000 | [diff] [blame] | 1928 | debug("channel %d: rcvd request for %s", c->self, service); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1929 | debug("cb_fn %p cb_event %d", c->cb_fn , c->cb_event); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1930 | xfree(service); |
| 1931 | } |
| 1932 | } |
| 1933 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1934 | void |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 1935 | channel_input_window_adjust(int type, int plen, void *ctxt) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1936 | { |
| 1937 | Channel *c; |
| 1938 | int id, adjust; |
| 1939 | |
| 1940 | if (!compat20) |
| 1941 | return; |
| 1942 | |
| 1943 | /* Get the channel number and verify it. */ |
| 1944 | id = packet_get_int(); |
| 1945 | c = channel_lookup(id); |
| 1946 | |
| 1947 | if (c == NULL || c->type != SSH_CHANNEL_OPEN) { |
| 1948 | log("Received window adjust for " |
| 1949 | "non-open channel %d.", id); |
| 1950 | return; |
| 1951 | } |
| 1952 | adjust = packet_get_int(); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1953 | packet_done(); |
Damien Miller | d344494 | 2000-09-30 14:20:03 +1100 | [diff] [blame] | 1954 | debug2("channel %d: rcvd adjust %d", id, adjust); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1955 | c->remote_window += adjust; |
| 1956 | } |
| 1957 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1958 | void |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1959 | channel_input_port_open(int type, int plen, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1960 | { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1961 | Channel *c = NULL; |
| 1962 | u_short host_port; |
| 1963 | char *host, *originator_string; |
| 1964 | int remote_id, sock = -1; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1965 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1966 | remote_id = packet_get_int(); |
| 1967 | host = packet_get_string(NULL); |
| 1968 | host_port = packet_get_int(); |
| 1969 | |
| 1970 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { |
| 1971 | originator_string = packet_get_string(NULL); |
| 1972 | } else { |
| 1973 | originator_string = xstrdup("unknown (remote did not supply name)"); |
| 1974 | } |
| 1975 | packet_done(); |
| 1976 | sock = channel_connect_to(host, host_port); |
| 1977 | if (sock != -1) { |
| 1978 | c = channel_new("connected socket", |
| 1979 | SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0, |
| 1980 | originator_string, 1); |
| 1981 | if (c == NULL) { |
| 1982 | error("channel_input_port_open: channel_new failed"); |
| 1983 | close(sock); |
| 1984 | } else { |
| 1985 | c->remote_id = remote_id; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1986 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1987 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1988 | if (c == NULL) { |
| 1989 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 1990 | packet_put_int(remote_id); |
| 1991 | packet_send(); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 1992 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1993 | xfree(host); |
Ben Lindstrom | 5744dc4 | 2001-04-13 23:28:01 +0000 | [diff] [blame] | 1994 | } |
| 1995 | |
| 1996 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 1997 | /* -- tcp forwarding */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1998 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1999 | /* |
| 2000 | * Initiate forwarding of connections to local port "port" through the secure |
| 2001 | * channel to host:port from remote side. |
| 2002 | */ |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2003 | int |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2004 | channel_request_local_forwarding(u_short listen_port, const char *host_to_connect, |
| 2005 | u_short port_to_connect, int gateway_ports) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2006 | { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2007 | return channel_request_forwarding( |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2008 | NULL, listen_port, |
| 2009 | host_to_connect, port_to_connect, |
| 2010 | gateway_ports, /*remote_fwd*/ 0); |
| 2011 | } |
| 2012 | |
| 2013 | /* |
| 2014 | * If 'remote_fwd' is true we have a '-R style' listener for protocol 2 |
| 2015 | * (SSH_CHANNEL_RPORT_LISTENER). |
| 2016 | */ |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2017 | int |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2018 | channel_request_forwarding( |
| 2019 | const char *listen_address, u_short listen_port, |
| 2020 | const char *host_to_connect, u_short port_to_connect, |
| 2021 | int gateway_ports, int remote_fwd) |
| 2022 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2023 | Channel *c; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2024 | int success, sock, on = 1, type; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2025 | struct addrinfo hints, *ai, *aitop; |
| 2026 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2027 | const char *host; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2028 | struct linger linger; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2029 | |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2030 | success = 0; |
| 2031 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2032 | if (remote_fwd) { |
| 2033 | host = listen_address; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2034 | type = SSH_CHANNEL_RPORT_LISTENER; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2035 | } else { |
| 2036 | host = host_to_connect; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2037 | type = SSH_CHANNEL_PORT_LISTENER; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2038 | } |
| 2039 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2040 | if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) { |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2041 | error("Forward host name too long."); |
| 2042 | return success; |
| 2043 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2044 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2045 | /* XXX listen_address is currently ignored */ |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2046 | /* |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2047 | * getaddrinfo returns a loopback address if the hostname is |
| 2048 | * set to NULL and hints.ai_flags is not AI_PASSIVE |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2049 | */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2050 | memset(&hints, 0, sizeof(hints)); |
| 2051 | hints.ai_family = IPv4or6; |
| 2052 | hints.ai_flags = gateway_ports ? AI_PASSIVE : 0; |
| 2053 | hints.ai_socktype = SOCK_STREAM; |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2054 | snprintf(strport, sizeof strport, "%d", listen_port); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2055 | if (getaddrinfo(NULL, strport, &hints, &aitop) != 0) |
| 2056 | packet_disconnect("getaddrinfo: fatal error"); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2057 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2058 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 2059 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 2060 | continue; |
| 2061 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
| 2062 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2063 | error("channel_request_forwarding: getnameinfo failed"); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2064 | continue; |
| 2065 | } |
| 2066 | /* Create a port to listen for the host. */ |
| 2067 | sock = socket(ai->ai_family, SOCK_STREAM, 0); |
| 2068 | if (sock < 0) { |
| 2069 | /* this is no error since kernel may not support ipv6 */ |
| 2070 | verbose("socket: %.100s", strerror(errno)); |
| 2071 | continue; |
| 2072 | } |
| 2073 | /* |
| 2074 | * Set socket options. We would like the socket to disappear |
| 2075 | * as soon as it has been closed for whatever reason. |
| 2076 | */ |
| 2077 | setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)); |
| 2078 | linger.l_onoff = 1; |
| 2079 | linger.l_linger = 5; |
| 2080 | setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger)); |
| 2081 | debug("Local forwarding listening on %s port %s.", ntop, strport); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2082 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2083 | /* Bind the socket to the address. */ |
| 2084 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
| 2085 | /* address can be in use ipv6 address is already bound */ |
Damien Miller | 3c7eeb2 | 2000-03-03 22:35:33 +1100 | [diff] [blame] | 2086 | if (!ai->ai_next) |
| 2087 | error("bind: %.100s", strerror(errno)); |
| 2088 | else |
| 2089 | verbose("bind: %.100s", strerror(errno)); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 2090 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2091 | close(sock); |
| 2092 | continue; |
| 2093 | } |
| 2094 | /* Start listening for connections on the socket. */ |
| 2095 | if (listen(sock, 5) < 0) { |
| 2096 | error("listen: %.100s", strerror(errno)); |
| 2097 | close(sock); |
| 2098 | continue; |
| 2099 | } |
| 2100 | /* Allocate a channel number for the socket. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2101 | c = channel_new("port listener", type, sock, sock, -1, |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2102 | CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 2103 | 0, xstrdup("port listener"), 1); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2104 | if (c == NULL) { |
| 2105 | error("channel_request_forwarding: channel_new failed"); |
| 2106 | close(sock); |
| 2107 | continue; |
| 2108 | } |
| 2109 | strlcpy(c->path, host, sizeof(c->path)); |
| 2110 | c->host_port = port_to_connect; |
| 2111 | c->listening_port = listen_port; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2112 | success = 1; |
| 2113 | } |
| 2114 | if (success == 0) |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2115 | error("channel_request_forwarding: cannot listen to port: %d", |
| 2116 | listen_port); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2117 | freeaddrinfo(aitop); |
Kevin Steves | 1205750 | 2001-02-05 14:54:34 +0000 | [diff] [blame] | 2118 | return success; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2119 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2120 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2121 | /* |
| 2122 | * Initiate forwarding of connections to port "port" on remote host through |
| 2123 | * the secure channel to host:port from local side. |
| 2124 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2125 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2126 | void |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2127 | channel_request_remote_forwarding(u_short listen_port, |
| 2128 | const char *host_to_connect, u_short port_to_connect) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2129 | { |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2130 | int payload_len, type, success = 0; |
| 2131 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2132 | /* Record locally that connection to this host/port is permitted. */ |
| 2133 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) |
| 2134 | fatal("channel_request_remote_forwarding: too many forwards"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2135 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2136 | /* Send the forward request to the remote side. */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2137 | if (compat20) { |
| 2138 | const char *address_to_bind = "0.0.0.0"; |
| 2139 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
| 2140 | packet_put_cstring("tcpip-forward"); |
| 2141 | packet_put_char(0); /* boolean: want reply */ |
| 2142 | packet_put_cstring(address_to_bind); |
| 2143 | packet_put_int(listen_port); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2144 | packet_send(); |
| 2145 | packet_write_wait(); |
| 2146 | /* Assume that server accepts the request */ |
| 2147 | success = 1; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2148 | } else { |
| 2149 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2150 | packet_put_int(listen_port); |
Damien Miller | 8bb73be | 2000-04-19 16:26:12 +1000 | [diff] [blame] | 2151 | packet_put_cstring(host_to_connect); |
| 2152 | packet_put_int(port_to_connect); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2153 | packet_send(); |
| 2154 | packet_write_wait(); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2155 | |
| 2156 | /* Wait for response from the remote side. */ |
| 2157 | type = packet_read(&payload_len); |
| 2158 | switch (type) { |
| 2159 | case SSH_SMSG_SUCCESS: |
| 2160 | success = 1; |
| 2161 | break; |
| 2162 | case SSH_SMSG_FAILURE: |
| 2163 | log("Warning: Server denied remote port forwarding."); |
| 2164 | break; |
| 2165 | default: |
| 2166 | /* Unknown packet */ |
| 2167 | packet_disconnect("Protocol error for port forward request:" |
| 2168 | "received packet type %d.", type); |
| 2169 | } |
| 2170 | } |
| 2171 | if (success) { |
| 2172 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); |
| 2173 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; |
| 2174 | permitted_opens[num_permitted_opens].listen_port = listen_port; |
| 2175 | num_permitted_opens++; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2176 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2177 | } |
| 2178 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2179 | /* |
| 2180 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates |
| 2181 | * listening for the port, and sends back a success reply (or disconnect |
| 2182 | * message if there was an error). This never returns if there was an error. |
| 2183 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2184 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2185 | void |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2186 | channel_input_port_forward_request(int is_root, int gateway_ports) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2187 | { |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 2188 | u_short port, host_port; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2189 | char *hostname; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2190 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2191 | /* Get arguments from the packet. */ |
| 2192 | port = packet_get_int(); |
| 2193 | hostname = packet_get_string(NULL); |
| 2194 | host_port = packet_get_int(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2195 | |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 2196 | #ifndef HAVE_CYGWIN |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2197 | /* |
| 2198 | * Check that an unprivileged user is not trying to forward a |
| 2199 | * privileged port. |
| 2200 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2201 | if (port < IPPORT_RESERVED && !is_root) |
| 2202 | packet_disconnect("Requested forwarding of port %d but user is not root.", |
| 2203 | port); |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 2204 | #endif |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2205 | /* Initiate forwarding */ |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2206 | channel_request_local_forwarding(port, hostname, host_port, gateway_ports); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2207 | |
| 2208 | /* Free the argument string. */ |
| 2209 | xfree(hostname); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2210 | } |
| 2211 | |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2212 | /* |
| 2213 | * Permits opening to any host/port if permitted_opens[] is empty. This is |
| 2214 | * usually called by the server, because the user could connect to any port |
| 2215 | * anyway, and the server has no way to know but to trust the client anyway. |
| 2216 | */ |
| 2217 | void |
| 2218 | channel_permit_all_opens() |
| 2219 | { |
| 2220 | if (num_permitted_opens == 0) |
| 2221 | all_opens_permitted = 1; |
| 2222 | } |
| 2223 | |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 2224 | void |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2225 | channel_add_permitted_opens(char *host, int port) |
| 2226 | { |
| 2227 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) |
| 2228 | fatal("channel_request_remote_forwarding: too many forwards"); |
| 2229 | debug("allow port forwarding to host %s port %d", host, port); |
| 2230 | |
| 2231 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host); |
| 2232 | permitted_opens[num_permitted_opens].port_to_connect = port; |
| 2233 | num_permitted_opens++; |
| 2234 | |
| 2235 | all_opens_permitted = 0; |
| 2236 | } |
| 2237 | |
Ben Lindstrom | a370005 | 2001-04-05 23:26:32 +0000 | [diff] [blame] | 2238 | void |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2239 | channel_clear_permitted_opens(void) |
| 2240 | { |
| 2241 | int i; |
| 2242 | |
| 2243 | for (i = 0; i < num_permitted_opens; i++) |
| 2244 | xfree(permitted_opens[i].host_to_connect); |
| 2245 | num_permitted_opens = 0; |
| 2246 | |
| 2247 | } |
| 2248 | |
| 2249 | |
| 2250 | /* return socket to remote host, port */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2251 | int |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2252 | connect_to(const char *host, u_short port) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2253 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2254 | struct addrinfo hints, *ai, *aitop; |
| 2255 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
| 2256 | int gaierr; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2257 | int sock = -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2258 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2259 | memset(&hints, 0, sizeof(hints)); |
| 2260 | hints.ai_family = IPv4or6; |
| 2261 | hints.ai_socktype = SOCK_STREAM; |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2262 | snprintf(strport, sizeof strport, "%d", port); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2263 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2264 | error("connect_to %.100s: unknown host (%s)", host, |
| 2265 | gai_strerror(gaierr)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2266 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2267 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2268 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 2269 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 2270 | continue; |
| 2271 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
| 2272 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2273 | error("connect_to: getnameinfo failed"); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2274 | continue; |
| 2275 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2276 | sock = socket(ai->ai_family, SOCK_STREAM, 0); |
| 2277 | if (sock < 0) { |
| 2278 | error("socket: %.100s", strerror(errno)); |
| 2279 | continue; |
| 2280 | } |
Ben Lindstrom | 48bd7c1 | 2001-01-09 00:35:42 +0000 | [diff] [blame] | 2281 | if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0) |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 2282 | fatal("connect_to: F_SETFL: %s", strerror(errno)); |
Ben Lindstrom | 7ad9710 | 2000-12-06 01:42:49 +0000 | [diff] [blame] | 2283 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 && |
| 2284 | errno != EINPROGRESS) { |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2285 | error("connect_to %.100s port %s: %.100s", ntop, strport, |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2286 | strerror(errno)); |
| 2287 | close(sock); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 2288 | continue; /* fail -- try next */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2289 | } |
| 2290 | break; /* success */ |
| 2291 | |
| 2292 | } |
| 2293 | freeaddrinfo(aitop); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2294 | if (!ai) { |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2295 | error("connect_to %.100s port %d: failed.", host, port); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2296 | return -1; |
| 2297 | } |
| 2298 | /* success */ |
| 2299 | return sock; |
| 2300 | } |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2301 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2302 | int |
| 2303 | channel_connect_by_listen_adress(u_short listen_port) |
| 2304 | { |
| 2305 | int i; |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2306 | |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2307 | for (i = 0; i < num_permitted_opens; i++) |
| 2308 | if (permitted_opens[i].listen_port == listen_port) |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2309 | return connect_to( |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2310 | permitted_opens[i].host_to_connect, |
| 2311 | permitted_opens[i].port_to_connect); |
Ben Lindstrom | c72745a | 2000-12-02 19:03:54 +0000 | [diff] [blame] | 2312 | error("WARNING: Server requests forwarding for unknown listen_port %d", |
| 2313 | listen_port); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2314 | return -1; |
| 2315 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2316 | |
Ben Lindstrom | 7bb8b49 | 2001-03-17 00:47:54 +0000 | [diff] [blame] | 2317 | /* Check if connecting to that port is permitted and connect. */ |
| 2318 | int |
| 2319 | channel_connect_to(const char *host, u_short port) |
| 2320 | { |
| 2321 | int i, permit; |
| 2322 | |
| 2323 | permit = all_opens_permitted; |
| 2324 | if (!permit) { |
| 2325 | for (i = 0; i < num_permitted_opens; i++) |
| 2326 | if (permitted_opens[i].port_to_connect == port && |
| 2327 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
| 2328 | permit = 1; |
| 2329 | |
| 2330 | } |
| 2331 | if (!permit) { |
| 2332 | log("Received request to connect to host %.100s port %d, " |
| 2333 | "but the request was denied.", host, port); |
| 2334 | return -1; |
| 2335 | } |
| 2336 | return connect_to(host, port); |
| 2337 | } |
| 2338 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2339 | /* -- X11 forwarding */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2340 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2341 | /* |
| 2342 | * Creates an internet domain socket for listening for X11 connections. |
| 2343 | * Returns a suitable value for the DISPLAY variable, or NULL if an error |
| 2344 | * occurs. |
| 2345 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2346 | char * |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 2347 | x11_create_display_inet(int screen_number, int x11_display_offset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2348 | { |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 2349 | int display_number, sock; |
| 2350 | u_short port; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2351 | struct addrinfo hints, *ai, *aitop; |
| 2352 | char strport[NI_MAXSERV]; |
| 2353 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; |
| 2354 | char display[512]; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2355 | char hostname[MAXHOSTNAMELEN]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2356 | |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 2357 | for (display_number = x11_display_offset; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2358 | display_number < MAX_DISPLAYS; |
| 2359 | display_number++) { |
| 2360 | port = 6000 + display_number; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2361 | memset(&hints, 0, sizeof(hints)); |
| 2362 | hints.ai_family = IPv4or6; |
| 2363 | hints.ai_flags = AI_PASSIVE; /* XXX loopback only ? */ |
| 2364 | hints.ai_socktype = SOCK_STREAM; |
| 2365 | snprintf(strport, sizeof strport, "%d", port); |
| 2366 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { |
| 2367 | error("getaddrinfo: %.100s", gai_strerror(gaierr)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2368 | return NULL; |
| 2369 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2370 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 2371 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 2372 | continue; |
| 2373 | sock = socket(ai->ai_family, SOCK_STREAM, 0); |
| 2374 | if (sock < 0) { |
Damien Miller | 89d9796 | 2000-10-14 12:37:19 +1100 | [diff] [blame] | 2375 | if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) { |
Damien Miller | e219273 | 2000-01-17 13:22:55 +1100 | [diff] [blame] | 2376 | error("socket: %.100s", strerror(errno)); |
| 2377 | return NULL; |
| 2378 | } else { |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 2379 | debug("x11_create_display_inet: Socket family %d not supported", |
| 2380 | ai->ai_family); |
Damien Miller | e219273 | 2000-01-17 13:22:55 +1100 | [diff] [blame] | 2381 | continue; |
| 2382 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2383 | } |
| 2384 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
| 2385 | debug("bind port %d: %.100s", port, strerror(errno)); |
| 2386 | shutdown(sock, SHUT_RDWR); |
| 2387 | close(sock); |
Damien Miller | 3c7eeb2 | 2000-03-03 22:35:33 +1100 | [diff] [blame] | 2388 | |
| 2389 | if (ai->ai_next) |
| 2390 | continue; |
| 2391 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2392 | for (n = 0; n < num_socks; n++) { |
| 2393 | shutdown(socks[n], SHUT_RDWR); |
| 2394 | close(socks[n]); |
| 2395 | } |
| 2396 | num_socks = 0; |
| 2397 | break; |
| 2398 | } |
| 2399 | socks[num_socks++] = sock; |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 2400 | #ifndef DONT_TRY_OTHER_AF |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2401 | if (num_socks == NUM_SOCKS) |
| 2402 | break; |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 2403 | #else |
| 2404 | break; |
| 2405 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2406 | } |
Ben Lindstrom | 87b147f | 2001-01-25 00:41:12 +0000 | [diff] [blame] | 2407 | freeaddrinfo(aitop); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2408 | if (num_socks > 0) |
| 2409 | break; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2410 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2411 | if (display_number >= MAX_DISPLAYS) { |
| 2412 | error("Failed to allocate internet-domain X11 display socket."); |
| 2413 | return NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2414 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2415 | /* Start listening for connections on the socket. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2416 | for (n = 0; n < num_socks; n++) { |
| 2417 | sock = socks[n]; |
| 2418 | if (listen(sock, 5) < 0) { |
| 2419 | error("listen: %.100s", strerror(errno)); |
| 2420 | shutdown(sock, SHUT_RDWR); |
| 2421 | close(sock); |
| 2422 | return NULL; |
| 2423 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2424 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2425 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2426 | /* Set up a suitable value for the DISPLAY variable. */ |
| 2427 | if (gethostname(hostname, sizeof(hostname)) < 0) |
| 2428 | fatal("gethostname: %.100s", strerror(errno)); |
Damien Miller | 76112de | 1999-12-21 11:18:08 +1100 | [diff] [blame] | 2429 | |
| 2430 | #ifdef IPADDR_IN_DISPLAY |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 2431 | /* |
Damien Miller | 76112de | 1999-12-21 11:18:08 +1100 | [diff] [blame] | 2432 | * HPUX detects the local hostname in the DISPLAY variable and tries |
| 2433 | * to set up a shared memory connection to the server, which it |
| 2434 | * incorrectly supposes to be local. |
| 2435 | * |
| 2436 | * The workaround - as used in later $$H and other programs - is |
| 2437 | * is to set display to the host's IP address. |
| 2438 | */ |
| 2439 | { |
| 2440 | struct hostent *he; |
| 2441 | struct in_addr my_addr; |
| 2442 | |
| 2443 | he = gethostbyname(hostname); |
| 2444 | if (he == NULL) { |
| 2445 | error("[X11-broken-fwd-hostname-workaround] Could not get " |
| 2446 | "IP address for hostname %s.", hostname); |
| 2447 | |
| 2448 | packet_send_debug("[X11-broken-fwd-hostname-workaround]" |
| 2449 | "Could not get IP address for hostname %s.", hostname); |
| 2450 | |
| 2451 | shutdown(sock, SHUT_RDWR); |
| 2452 | close(sock); |
| 2453 | |
| 2454 | return NULL; |
| 2455 | } |
| 2456 | |
| 2457 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); |
| 2458 | |
| 2459 | /* Set DISPLAY to <ip address>:screen.display */ |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 2460 | snprintf(display, sizeof(display), "%.50s:%d.%d", inet_ntoa(my_addr), |
Kevin Steves | da6cd59 | 2000-12-29 18:41:21 +0000 | [diff] [blame] | 2461 | display_number, screen_number); |
Damien Miller | 76112de | 1999-12-21 11:18:08 +1100 | [diff] [blame] | 2462 | } |
| 2463 | #else /* IPADDR_IN_DISPLAY */ |
| 2464 | /* Just set DISPLAY to hostname:screen.display */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2465 | snprintf(display, sizeof display, "%.400s:%d.%d", hostname, |
Kevin Steves | da6cd59 | 2000-12-29 18:41:21 +0000 | [diff] [blame] | 2466 | display_number, screen_number); |
Damien Miller | 76112de | 1999-12-21 11:18:08 +1100 | [diff] [blame] | 2467 | #endif /* IPADDR_IN_DISPLAY */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2468 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2469 | /* Allocate a channel for each socket. */ |
| 2470 | for (n = 0; n < num_socks; n++) { |
| 2471 | sock = socks[n]; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2472 | (void) channel_new("x11 listener", |
| 2473 | SSH_CHANNEL_X11_LISTENER, sock, sock, -1, |
| 2474 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 2475 | 0, xstrdup("X11 inet listener"), 1); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2476 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2477 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2478 | /* Return a suitable value for the DISPLAY environment variable. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2479 | return xstrdup(display); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2480 | } |
| 2481 | |
| 2482 | #ifndef X_UNIX_PATH |
| 2483 | #define X_UNIX_PATH "/tmp/.X11-unix/X" |
| 2484 | #endif |
| 2485 | |
| 2486 | static |
| 2487 | int |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 2488 | connect_local_xsocket(u_int dnr) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2489 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2490 | static const char *const x_sockets[] = { |
| 2491 | X_UNIX_PATH "%u", |
| 2492 | "/var/X/.X11-unix/X" "%u", |
| 2493 | "/usr/spool/sockets/X11/" "%u", |
| 2494 | NULL |
| 2495 | }; |
| 2496 | int sock; |
| 2497 | struct sockaddr_un addr; |
| 2498 | const char *const * path; |
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 | for (path = x_sockets; *path; ++path) { |
| 2501 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
| 2502 | if (sock < 0) |
| 2503 | error("socket: %.100s", strerror(errno)); |
| 2504 | memset(&addr, 0, sizeof(addr)); |
| 2505 | addr.sun_family = AF_UNIX; |
| 2506 | snprintf(addr.sun_path, sizeof addr.sun_path, *path, dnr); |
| 2507 | if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0) |
| 2508 | return sock; |
| 2509 | close(sock); |
| 2510 | } |
| 2511 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
| 2512 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2513 | } |
| 2514 | |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2515 | int |
| 2516 | x11_connect_display(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2517 | { |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2518 | int display_number, sock = 0; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2519 | const char *display; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2520 | char buf[1024], *cp; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2521 | struct addrinfo hints, *ai, *aitop; |
| 2522 | char strport[NI_MAXSERV]; |
| 2523 | int gaierr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2524 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2525 | /* Try to open a socket for the local X server. */ |
| 2526 | display = getenv("DISPLAY"); |
| 2527 | if (!display) { |
| 2528 | error("DISPLAY not set."); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2529 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2530 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2531 | /* |
| 2532 | * Now we decode the value of the DISPLAY variable and make a |
| 2533 | * connection to the real X server. |
| 2534 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2535 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2536 | /* |
| 2537 | * Check if it is a unix domain socket. Unix domain displays are in |
| 2538 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] |
| 2539 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2540 | if (strncmp(display, "unix:", 5) == 0 || |
| 2541 | display[0] == ':') { |
| 2542 | /* Connect to the unix domain socket. */ |
| 2543 | if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) { |
| 2544 | error("Could not parse display number from DISPLAY: %.100s", |
| 2545 | display); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2546 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2547 | } |
| 2548 | /* Create a socket. */ |
| 2549 | sock = connect_local_xsocket(display_number); |
| 2550 | if (sock < 0) |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2551 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2552 | |
| 2553 | /* OK, we now have a connection to the display. */ |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2554 | return sock; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2555 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2556 | /* |
| 2557 | * Connect to an inet socket. The DISPLAY value is supposedly |
| 2558 | * hostname:d[.s], where hostname may also be numeric IP address. |
| 2559 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2560 | strncpy(buf, display, sizeof(buf)); |
| 2561 | buf[sizeof(buf) - 1] = 0; |
| 2562 | cp = strchr(buf, ':'); |
| 2563 | if (!cp) { |
| 2564 | error("Could not find ':' in DISPLAY: %.100s", display); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2565 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2566 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2567 | *cp = 0; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2568 | /* 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] | 2569 | if (sscanf(cp + 1, "%d", &display_number) != 1) { |
| 2570 | error("Could not parse display number from DISPLAY: %.100s", |
| 2571 | display); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2572 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2573 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2574 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2575 | /* Look up the host address */ |
| 2576 | memset(&hints, 0, sizeof(hints)); |
| 2577 | hints.ai_family = IPv4or6; |
| 2578 | hints.ai_socktype = SOCK_STREAM; |
| 2579 | snprintf(strport, sizeof strport, "%d", 6000 + display_number); |
| 2580 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
| 2581 | error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr)); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2582 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2583 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2584 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 2585 | /* Create a socket. */ |
| 2586 | sock = socket(ai->ai_family, SOCK_STREAM, 0); |
| 2587 | if (sock < 0) { |
| 2588 | debug("socket: %.100s", strerror(errno)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2589 | continue; |
| 2590 | } |
| 2591 | /* Connect it to the display. */ |
| 2592 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
| 2593 | debug("connect %.100s port %d: %.100s", buf, |
| 2594 | 6000 + display_number, strerror(errno)); |
| 2595 | close(sock); |
| 2596 | continue; |
| 2597 | } |
| 2598 | /* Success */ |
| 2599 | break; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2600 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2601 | freeaddrinfo(aitop); |
| 2602 | if (!ai) { |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2603 | error("connect %.100s port %d: %.100s", buf, 6000 + display_number, |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 2604 | strerror(errno)); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2605 | return -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2606 | } |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2607 | return sock; |
| 2608 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2609 | |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2610 | /* |
| 2611 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains |
| 2612 | * the remote channel number. We should do whatever we want, and respond |
| 2613 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. |
| 2614 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2615 | |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2616 | void |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 2617 | x11_input_open(int type, int plen, void *ctxt) |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2618 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2619 | Channel *c = NULL; |
| 2620 | int remote_id, sock = 0; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2621 | char *remote_host; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2622 | |
| 2623 | debug("Received X11 open request."); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2624 | |
| 2625 | remote_id = packet_get_int(); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2626 | |
| 2627 | if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2628 | remote_host = packet_get_string(NULL); |
| 2629 | } else { |
| 2630 | remote_host = xstrdup("unknown (remote did not supply name)"); |
| 2631 | } |
| 2632 | packet_done(); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2633 | |
| 2634 | /* Obtain a connection to the real X display. */ |
| 2635 | sock = x11_connect_display(); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2636 | if (sock != -1) { |
| 2637 | /* Allocate a channel for this connection. */ |
| 2638 | c = channel_new("connected x11 socket", |
| 2639 | SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0, |
| 2640 | remote_host, 1); |
| 2641 | if (c == NULL) { |
| 2642 | error("x11_input_open: channel_new failed"); |
| 2643 | close(sock); |
| 2644 | } else { |
| 2645 | c->remote_id = remote_id; |
| 2646 | } |
| 2647 | } |
| 2648 | if (c == NULL) { |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2649 | /* Send refusal to the remote host. */ |
| 2650 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2651 | packet_put_int(remote_id); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2652 | } else { |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2653 | /* Send a confirmation to the remote host. */ |
| 2654 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2655 | packet_put_int(remote_id); |
| 2656 | packet_put_int(c->self); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2657 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2658 | packet_send(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2659 | } |
| 2660 | |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 2661 | /* dummy protocol handler that denies SSH-1 requests (agent/x11) */ |
| 2662 | void |
| 2663 | deny_input_open(int type, int plen, void *ctxt) |
| 2664 | { |
| 2665 | int rchan = packet_get_int(); |
| 2666 | switch(type){ |
| 2667 | case SSH_SMSG_AGENT_OPEN: |
| 2668 | error("Warning: ssh server tried agent forwarding."); |
| 2669 | break; |
| 2670 | case SSH_SMSG_X11_OPEN: |
| 2671 | error("Warning: ssh server tried X11 forwarding."); |
| 2672 | break; |
| 2673 | default: |
| 2674 | error("deny_input_open: type %d plen %d", type, plen); |
| 2675 | break; |
| 2676 | } |
| 2677 | error("Warning: this is probably a break in attempt by a malicious server."); |
| 2678 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 2679 | packet_put_int(rchan); |
| 2680 | packet_send(); |
| 2681 | } |
| 2682 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2683 | /* |
| 2684 | * Requests forwarding of X11 connections, generates fake authentication |
| 2685 | * data, and enables authentication spoofing. |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2686 | * This should be called in the client only. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2687 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2688 | void |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2689 | x11_request_forwarding_with_spoofing(int client_session_id, |
| 2690 | const char *proto, const char *data) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2691 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 2692 | u_int data_len = (u_int) strlen(data) / 2; |
Ben Lindstrom | b3211a8 | 2001-02-10 22:33:19 +0000 | [diff] [blame] | 2693 | u_int i, value, len; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2694 | char *new_data; |
| 2695 | int screen_number; |
| 2696 | const char *cp; |
| 2697 | u_int32_t rand = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2698 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2699 | cp = getenv("DISPLAY"); |
| 2700 | if (cp) |
| 2701 | cp = strchr(cp, ':'); |
| 2702 | if (cp) |
| 2703 | cp = strchr(cp, '.'); |
| 2704 | if (cp) |
| 2705 | screen_number = atoi(cp + 1); |
| 2706 | else |
| 2707 | screen_number = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2708 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2709 | /* Save protocol name. */ |
| 2710 | x11_saved_proto = xstrdup(proto); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2711 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2712 | /* |
| 2713 | * Extract real authentication data and generate fake data of the |
| 2714 | * same length. |
| 2715 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2716 | x11_saved_data = xmalloc(data_len); |
| 2717 | x11_fake_data = xmalloc(data_len); |
| 2718 | for (i = 0; i < data_len; i++) { |
| 2719 | if (sscanf(data + 2 * i, "%2x", &value) != 1) |
| 2720 | fatal("x11_request_forwarding: bad authentication data: %.100s", data); |
| 2721 | if (i % 4 == 0) |
| 2722 | rand = arc4random(); |
| 2723 | x11_saved_data[i] = value; |
| 2724 | x11_fake_data[i] = rand & 0xff; |
| 2725 | rand >>= 8; |
| 2726 | } |
| 2727 | x11_saved_data_len = data_len; |
| 2728 | x11_fake_data_len = data_len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2729 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2730 | /* Convert the fake data into hex. */ |
Ben Lindstrom | b3211a8 | 2001-02-10 22:33:19 +0000 | [diff] [blame] | 2731 | len = 2 * data_len + 1; |
| 2732 | new_data = xmalloc(len); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2733 | for (i = 0; i < data_len; i++) |
Ben Lindstrom | b3211a8 | 2001-02-10 22:33:19 +0000 | [diff] [blame] | 2734 | snprintf(new_data + 2 * i, len - 2 * i, |
| 2735 | "%02x", (u_char) x11_fake_data[i]); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2736 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2737 | /* Send the request packet. */ |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2738 | if (compat20) { |
| 2739 | channel_request_start(client_session_id, "x11-req", 0); |
| 2740 | packet_put_char(0); /* XXX bool single connection */ |
| 2741 | } else { |
| 2742 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); |
| 2743 | } |
| 2744 | packet_put_cstring(proto); |
| 2745 | packet_put_cstring(new_data); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2746 | packet_put_int(screen_number); |
| 2747 | packet_send(); |
| 2748 | packet_write_wait(); |
| 2749 | xfree(new_data); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2750 | } |
| 2751 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2752 | |
| 2753 | /* -- agent forwarding */ |
| 2754 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2755 | /* Sends a message to the server to request authentication fd forwarding. */ |
| 2756 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2757 | void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2758 | auth_request_forwarding() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2759 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2760 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
| 2761 | packet_send(); |
| 2762 | packet_write_wait(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2763 | } |
| 2764 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2765 | /* |
| 2766 | * Returns the name of the forwarded authentication socket. Returns NULL if |
| 2767 | * there is no forwarded authentication socket. The returned value points to |
| 2768 | * a static buffer. |
| 2769 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2770 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2771 | char * |
| 2772 | auth_get_socket_name() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2773 | { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2774 | return auth_sock_name; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2775 | } |
| 2776 | |
| 2777 | /* removes the agent forwarding socket */ |
| 2778 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2779 | void |
Ben Lindstrom | 983c098 | 2001-06-09 01:20:06 +0000 | [diff] [blame] | 2780 | auth_sock_cleanup_proc(void *_pw) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2781 | { |
Ben Lindstrom | 983c098 | 2001-06-09 01:20:06 +0000 | [diff] [blame] | 2782 | struct passwd *pw = _pw; |
| 2783 | |
Ben Lindstrom | 838394c | 2001-06-09 01:11:59 +0000 | [diff] [blame] | 2784 | if (auth_sock_name) { |
Ben Lindstrom | 983c098 | 2001-06-09 01:20:06 +0000 | [diff] [blame] | 2785 | temporarily_use_uid(pw); |
Ben Lindstrom | 838394c | 2001-06-09 01:11:59 +0000 | [diff] [blame] | 2786 | unlink(auth_sock_name); |
| 2787 | rmdir(auth_sock_dir); |
| 2788 | auth_sock_name = NULL; |
Ben Lindstrom | 983c098 | 2001-06-09 01:20:06 +0000 | [diff] [blame] | 2789 | restore_uid(); |
Ben Lindstrom | 838394c | 2001-06-09 01:11:59 +0000 | [diff] [blame] | 2790 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2791 | } |
| 2792 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2793 | /* |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 2794 | * 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] | 2795 | * This starts forwarding authentication requests. |
| 2796 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2797 | |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 2798 | int |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2799 | auth_input_request_forwarding(struct passwd * pw) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2800 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2801 | Channel *nc; |
| 2802 | int sock; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2803 | struct sockaddr_un sunaddr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2804 | |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2805 | if (auth_get_socket_name() != NULL) { |
| 2806 | error("authentication forwarding requested twice."); |
| 2807 | return 0; |
| 2808 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2809 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2810 | /* Temporarily drop privileged uid for mkdir/bind. */ |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 2811 | temporarily_use_uid(pw); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2812 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2813 | /* Allocate a buffer for the socket name, and format the name. */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2814 | auth_sock_name = xmalloc(MAXPATHLEN); |
| 2815 | auth_sock_dir = xmalloc(MAXPATHLEN); |
| 2816 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2817 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2818 | /* Create private directory for socket */ |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2819 | if (mkdtemp(auth_sock_dir) == NULL) { |
| 2820 | packet_send_debug("Agent forwarding disabled: " |
| 2821 | "mkdtemp() failed: %.100s", strerror(errno)); |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 2822 | restore_uid(); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2823 | xfree(auth_sock_name); |
| 2824 | xfree(auth_sock_dir); |
| 2825 | auth_sock_name = NULL; |
| 2826 | auth_sock_dir = NULL; |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 2827 | return 0; |
| 2828 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2829 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%d", |
| 2830 | auth_sock_dir, (int) getpid()); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2831 | |
Ben Lindstrom | 838394c | 2001-06-09 01:11:59 +0000 | [diff] [blame] | 2832 | /* delete agent socket on fatal() */ |
Ben Lindstrom | 983c098 | 2001-06-09 01:20:06 +0000 | [diff] [blame] | 2833 | fatal_add_cleanup(auth_sock_cleanup_proc, pw); |
Ben Lindstrom | 838394c | 2001-06-09 01:11:59 +0000 | [diff] [blame] | 2834 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2835 | /* Create the socket. */ |
| 2836 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
| 2837 | if (sock < 0) |
| 2838 | packet_disconnect("socket: %.100s", strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2839 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2840 | /* Bind it to the name. */ |
| 2841 | memset(&sunaddr, 0, sizeof(sunaddr)); |
| 2842 | sunaddr.sun_family = AF_UNIX; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2843 | strncpy(sunaddr.sun_path, auth_sock_name, |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2844 | sizeof(sunaddr.sun_path)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2845 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2846 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) |
| 2847 | packet_disconnect("bind: %.100s", strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2848 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2849 | /* Restore the privileged uid. */ |
| 2850 | restore_uid(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2851 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2852 | /* Start listening on the socket. */ |
| 2853 | if (listen(sock, 5) < 0) |
| 2854 | packet_disconnect("listen: %.100s", strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2855 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2856 | /* Allocate a channel for the authentication agent socket. */ |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2857 | nc = channel_new("auth socket", |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2858 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, |
| 2859 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, |
| 2860 | 0, xstrdup("auth socket"), 1); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2861 | if (nc == NULL) { |
| 2862 | error("auth_input_request_forwarding: channel_new failed"); |
Ben Lindstrom | 983c098 | 2001-06-09 01:20:06 +0000 | [diff] [blame] | 2863 | auth_sock_cleanup_proc(pw); |
Ben Lindstrom | df4981b | 2001-06-09 01:32:29 +0000 | [diff] [blame^] | 2864 | fatal_remove_cleanup(auth_sock_cleanup_proc, pw); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2865 | close(sock); |
| 2866 | return 0; |
| 2867 | } |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2868 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
Damien Miller | d3a1857 | 2000-06-07 19:55:44 +1000 | [diff] [blame] | 2869 | return 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2870 | } |
| 2871 | |
| 2872 | /* This is called to process an SSH_SMSG_AGENT_OPEN message. */ |
| 2873 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 2874 | void |
Damien Miller | 62cee00 | 2000-09-23 17:15:56 +1100 | [diff] [blame] | 2875 | auth_input_open_request(int type, int plen, void *ctxt) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2876 | { |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2877 | Channel *c = NULL; |
| 2878 | int remote_id, sock; |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2879 | char *name; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2880 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2881 | packet_integrity_check(plen, 4, type); |
| 2882 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2883 | /* Read the remote channel number from the message. */ |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2884 | remote_id = packet_get_int(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2885 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2886 | /* |
| 2887 | * Get a connection to the local authentication agent (this may again |
| 2888 | * get forwarded). |
| 2889 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2890 | sock = ssh_get_authentication_socket(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2891 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2892 | /* |
| 2893 | * If we could not connect the agent, send an error message back to |
| 2894 | * the server. This should never happen unless the agent dies, |
| 2895 | * because authentication forwarding is only enabled if we have an |
| 2896 | * agent. |
| 2897 | */ |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2898 | if (sock >= 0) { |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2899 | name = xstrdup("authentication agent connection"); |
| 2900 | c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, |
| 2901 | -1, 0, 0, 0, name, 1); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2902 | if (c == NULL) { |
| 2903 | error("auth_input_open_request: channel_new failed"); |
Ben Lindstrom | e9c9991 | 2001-06-09 00:41:05 +0000 | [diff] [blame] | 2904 | xfree(name); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2905 | close(sock); |
| 2906 | } else { |
| 2907 | c->remote_id = remote_id; |
| 2908 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2909 | } |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 2910 | if (c == NULL) { |
| 2911 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 2912 | packet_put_int(remote_id); |
| 2913 | } else { |
| 2914 | /* Send a confirmation to the remote host. */ |
| 2915 | debug("Forwarding authentication connection."); |
| 2916 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 2917 | packet_put_int(remote_id); |
| 2918 | packet_put_int(c->self); |
| 2919 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2920 | packet_send(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2921 | } |