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 | * |
| 3 | * channels.c |
| 4 | * |
| 5 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 6 | * |
| 7 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 8 | * All rights reserved |
| 9 | * |
| 10 | * Created: Fri Mar 24 16:35:24 1995 ylo |
| 11 | * |
| 12 | * This file contains functions for generic socket connection forwarding. |
| 13 | * There is also code for initiating connection forwarding for X11 connections, |
| 14 | * arbitrary tcp/ip connections, and the authentication agent connection. |
| 15 | * |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 16 | * SSH2 support added by Markus Friedl. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 17 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 18 | |
| 19 | #include "includes.h" |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 20 | RCSID("$Id: channels.c,v 1.22 2000/04/06 02:32:38 damien Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 21 | |
| 22 | #include "ssh.h" |
| 23 | #include "packet.h" |
| 24 | #include "xmalloc.h" |
| 25 | #include "buffer.h" |
| 26 | #include "authfd.h" |
| 27 | #include "uidswap.h" |
Damien Miller | 6d7b2cd | 1999-11-12 15:19:27 +1100 | [diff] [blame] | 28 | #include "readconf.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 29 | #include "servconf.h" |
| 30 | |
| 31 | #include "channels.h" |
| 32 | #include "nchan.h" |
| 33 | #include "compat.h" |
| 34 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 35 | #include "ssh2.h" |
| 36 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 37 | /* Maximum number of fake X11 displays to try. */ |
| 38 | #define MAX_DISPLAYS 1000 |
| 39 | |
| 40 | /* Max len of agent socket */ |
| 41 | #define MAX_SOCKET_NAME 100 |
| 42 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 43 | /* default buffer for tcp-fwd-channel */ |
| 44 | #define CHAN_WINDOW_DEFAULT (8*1024) |
| 45 | #define CHAN_PACKET_DEFAULT (CHAN_WINDOW_DEFAULT/2) |
| 46 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 47 | /* |
| 48 | * Pointer to an array containing all allocated channels. The array is |
| 49 | * dynamically extended as needed. |
| 50 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 51 | static Channel *channels = NULL; |
| 52 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 53 | /* |
| 54 | * Size of the channel array. All slots of the array must always be |
| 55 | * initialized (at least the type field); unused slots are marked with type |
| 56 | * SSH_CHANNEL_FREE. |
| 57 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 58 | static int channels_alloc = 0; |
| 59 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 60 | /* |
| 61 | * Maximum file descriptor value used in any of the channels. This is |
| 62 | * updated in channel_allocate. |
| 63 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 64 | static int channel_max_fd_value = 0; |
| 65 | |
| 66 | /* Name and directory of socket for authentication agent forwarding. */ |
| 67 | static char *channel_forwarded_auth_socket_name = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 68 | static char *channel_forwarded_auth_socket_dir = NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 69 | |
| 70 | /* Saved X11 authentication protocol name. */ |
| 71 | char *x11_saved_proto = NULL; |
| 72 | |
| 73 | /* Saved X11 authentication data. This is the real data. */ |
| 74 | char *x11_saved_data = NULL; |
| 75 | unsigned int x11_saved_data_len = 0; |
| 76 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 77 | /* |
| 78 | * Fake X11 authentication data. This is what the server will be sending us; |
| 79 | * we should replace any occurrences of this by the real data. |
| 80 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 81 | char *x11_fake_data = NULL; |
| 82 | unsigned int x11_fake_data_len; |
| 83 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 84 | /* |
| 85 | * Data structure for storing which hosts are permitted for forward requests. |
| 86 | * The local sides of any remote forwards are stored in this array to prevent |
| 87 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local |
| 88 | * network (which might be behind a firewall). |
| 89 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 90 | typedef struct { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 91 | char *host_to_connect; /* Connect to 'host'. */ |
| 92 | u_short port_to_connect; /* Connect to 'port'. */ |
| 93 | u_short listen_port; /* Remote side should listen port number. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 94 | } ForwardPermission; |
| 95 | |
| 96 | /* List of all permitted host/port pairs to connect. */ |
| 97 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; |
| 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 | |
| 107 | /* This is set to true if both sides support SSH_PROTOFLAG_HOST_IN_FWD_OPEN. */ |
| 108 | static int have_hostname_in_open = 0; |
| 109 | |
| 110 | /* Sets specific protocol options. */ |
| 111 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 112 | void |
| 113 | channel_set_options(int hostname_in_open) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 114 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 115 | have_hostname_in_open = hostname_in_open; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 116 | } |
| 117 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 118 | /* |
| 119 | * Permits opening to any host/port in SSH_MSG_PORT_OPEN. This is usually |
| 120 | * called by the server, because the user could connect to any port anyway, |
| 121 | * and the server has no way to know but to trust the client anyway. |
| 122 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 123 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 124 | void |
| 125 | channel_permit_all_opens() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 126 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 127 | all_opens_permitted = 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 128 | } |
| 129 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 130 | /* lookup channel by id */ |
| 131 | |
| 132 | Channel * |
| 133 | channel_lookup(int id) |
| 134 | { |
| 135 | Channel *c; |
| 136 | if (id < 0 && id > channels_alloc) { |
| 137 | log("channel_lookup: %d: bad id", id); |
| 138 | return NULL; |
| 139 | } |
| 140 | c = &channels[id]; |
| 141 | if (c->type == SSH_CHANNEL_FREE) { |
| 142 | log("channel_lookup: %d: bad id: channel free", id); |
| 143 | return NULL; |
| 144 | } |
| 145 | return c; |
| 146 | } |
| 147 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 148 | /* |
| 149 | * Allocate a new channel object and set its type and socket. This will cause |
| 150 | * remote_name to be freed. |
| 151 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 152 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 153 | int |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 154 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
| 155 | int window, int maxpack, int extended_usage, char *remote_name) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 156 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 157 | int i, found; |
| 158 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 159 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 160 | /* Update the maximum file descriptor value. */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 161 | if (rfd > channel_max_fd_value) |
| 162 | channel_max_fd_value = rfd; |
| 163 | if (wfd > channel_max_fd_value) |
| 164 | channel_max_fd_value = wfd; |
| 165 | if (efd > channel_max_fd_value) |
| 166 | channel_max_fd_value = efd; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 167 | /* XXX set close-on-exec -markus */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 168 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 169 | /* Do initial allocation if this is the first call. */ |
| 170 | if (channels_alloc == 0) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 171 | chan_init(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 172 | channels_alloc = 10; |
| 173 | channels = xmalloc(channels_alloc * sizeof(Channel)); |
| 174 | for (i = 0; i < channels_alloc; i++) |
| 175 | channels[i].type = SSH_CHANNEL_FREE; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 176 | /* |
| 177 | * Kludge: arrange a call to channel_stop_listening if we |
| 178 | * terminate with fatal(). |
| 179 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 180 | fatal_add_cleanup((void (*) (void *)) channel_stop_listening, NULL); |
| 181 | } |
| 182 | /* Try to find a free slot where to put the new channel. */ |
| 183 | for (found = -1, i = 0; i < channels_alloc; i++) |
| 184 | if (channels[i].type == SSH_CHANNEL_FREE) { |
| 185 | /* Found a free slot. */ |
| 186 | found = i; |
| 187 | break; |
| 188 | } |
| 189 | if (found == -1) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 190 | /* 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] | 191 | found = channels_alloc; |
| 192 | channels_alloc += 10; |
| 193 | debug("channel: expanding %d", channels_alloc); |
| 194 | channels = xrealloc(channels, channels_alloc * sizeof(Channel)); |
| 195 | for (i = found; i < channels_alloc; i++) |
| 196 | channels[i].type = SSH_CHANNEL_FREE; |
| 197 | } |
| 198 | /* Initialize and return new channel number. */ |
| 199 | c = &channels[found]; |
| 200 | buffer_init(&c->input); |
| 201 | buffer_init(&c->output); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 202 | buffer_init(&c->extended); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 203 | chan_init_iostates(c); |
| 204 | c->self = found; |
| 205 | c->type = type; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 206 | c->ctype = ctype; |
| 207 | c->local_window = window; |
| 208 | c->local_window_max = window; |
| 209 | c->local_consumed = 0; |
| 210 | c->local_maxpacket = maxpack; |
| 211 | c->remote_window = 0; |
| 212 | c->remote_maxpacket = 0; |
| 213 | c->rfd = rfd; |
| 214 | c->wfd = wfd; |
| 215 | c->sock = (rfd == wfd) ? rfd : -1; |
| 216 | c->efd = efd; |
| 217 | c->extended_usage = extended_usage; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 218 | c->remote_id = -1; |
| 219 | c->remote_name = remote_name; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 220 | c->remote_window = 0; |
| 221 | c->remote_maxpacket = 0; |
| 222 | c->cb_fn = NULL; |
| 223 | c->cb_arg = NULL; |
| 224 | c->cb_event = 0; |
| 225 | c->dettach_user = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 226 | debug("channel %d: new [%s]", found, remote_name); |
| 227 | return found; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 228 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 229 | int |
| 230 | channel_allocate(int type, int sock, char *remote_name) |
| 231 | { |
| 232 | return channel_new("", type, sock, sock, -1, 0, 0, 0, remote_name); |
| 233 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 234 | |
| 235 | /* Free the channel and close its socket. */ |
| 236 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 237 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 238 | channel_free(int id) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 239 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 240 | Channel *c = channel_lookup(id); |
| 241 | if (c == NULL) |
| 242 | packet_disconnect("channel free: bad local channel %d", id); |
| 243 | debug("channel_free: channel %d: status: %s", id, channel_open_message()); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 244 | if (c->dettach_user != NULL) { |
| 245 | debug("channel_free: channel %d: dettaching channel user", id); |
| 246 | c->dettach_user(c->self, NULL); |
| 247 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 248 | if (c->sock != -1) { |
| 249 | shutdown(c->sock, SHUT_RDWR); |
| 250 | close(c->sock); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 251 | c->sock = -1; |
| 252 | } |
| 253 | if (compat20) { |
| 254 | if (c->rfd != -1) { |
| 255 | close(c->rfd); |
| 256 | c->rfd = -1; |
| 257 | } |
| 258 | if (c->wfd != -1) { |
| 259 | close(c->wfd); |
| 260 | c->wfd = -1; |
| 261 | } |
| 262 | if (c->efd != -1) { |
| 263 | close(c->efd); |
| 264 | c->efd = -1; |
| 265 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 266 | } |
| 267 | buffer_free(&c->input); |
| 268 | buffer_free(&c->output); |
| 269 | buffer_free(&c->extended); |
| 270 | c->type = SSH_CHANNEL_FREE; |
| 271 | if (c->remote_name) { |
| 272 | xfree(c->remote_name); |
| 273 | c->remote_name = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 274 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 275 | } |
| 276 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 277 | /* |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 278 | * 'channel_pre*' are called just before select() to add any bits relevant to |
| 279 | * channels in the select bitmasks. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 280 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 281 | /* |
| 282 | * 'channel_post*': perform any appropriate operations for channels which |
| 283 | * have events pending. |
| 284 | */ |
| 285 | typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset); |
| 286 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
| 287 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; |
| 288 | |
| 289 | void |
| 290 | channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 291 | { |
| 292 | FD_SET(c->sock, readset); |
| 293 | } |
| 294 | |
| 295 | void |
| 296 | channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset) |
| 297 | { |
| 298 | if (buffer_len(&c->input) < packet_get_maxsize()) |
| 299 | FD_SET(c->sock, readset); |
| 300 | if (buffer_len(&c->output) > 0) |
| 301 | FD_SET(c->sock, writeset); |
| 302 | } |
| 303 | |
| 304 | void |
| 305 | channel_pre_open_15(Channel *c, fd_set * readset, fd_set * writeset) |
| 306 | { |
| 307 | /* test whether sockets are 'alive' for read/write */ |
| 308 | if (c->istate == CHAN_INPUT_OPEN) |
| 309 | if (buffer_len(&c->input) < packet_get_maxsize()) |
| 310 | FD_SET(c->sock, readset); |
| 311 | if (c->ostate == CHAN_OUTPUT_OPEN || |
| 312 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { |
| 313 | if (buffer_len(&c->output) > 0) { |
| 314 | FD_SET(c->sock, writeset); |
| 315 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { |
| 316 | chan_obuf_empty(c); |
| 317 | } |
| 318 | } |
| 319 | } |
| 320 | |
| 321 | void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 322 | channel_pre_open_20(Channel *c, fd_set * readset, fd_set * writeset) |
| 323 | { |
| 324 | if (c->istate == CHAN_INPUT_OPEN && |
| 325 | c->remote_window > 0 && |
| 326 | buffer_len(&c->input) < c->remote_window) |
| 327 | FD_SET(c->rfd, readset); |
| 328 | if (c->ostate == CHAN_OUTPUT_OPEN || |
| 329 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { |
| 330 | if (buffer_len(&c->output) > 0) { |
| 331 | FD_SET(c->wfd, writeset); |
| 332 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { |
| 333 | chan_obuf_empty(c); |
| 334 | } |
| 335 | } |
| 336 | /** XXX check close conditions, too */ |
| 337 | if (c->efd != -1) { |
| 338 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
| 339 | buffer_len(&c->extended) > 0) |
| 340 | FD_SET(c->efd, writeset); |
| 341 | else if (c->extended_usage == CHAN_EXTENDED_READ && |
| 342 | buffer_len(&c->extended) < c->remote_window) |
| 343 | FD_SET(c->efd, readset); |
| 344 | } |
| 345 | } |
| 346 | |
| 347 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 348 | channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset) |
| 349 | { |
| 350 | if (buffer_len(&c->input) == 0) { |
| 351 | packet_start(SSH_MSG_CHANNEL_CLOSE); |
| 352 | packet_put_int(c->remote_id); |
| 353 | packet_send(); |
| 354 | c->type = SSH_CHANNEL_CLOSED; |
| 355 | debug("Closing channel %d after input drain.", c->self); |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | void |
| 360 | channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset) |
| 361 | { |
| 362 | if (buffer_len(&c->output) == 0) |
| 363 | channel_free(c->self); |
| 364 | else |
| 365 | FD_SET(c->sock, writeset); |
| 366 | } |
| 367 | |
| 368 | /* |
| 369 | * This is a special state for X11 authentication spoofing. An opened X11 |
| 370 | * connection (when authentication spoofing is being done) remains in this |
| 371 | * state until the first packet has been completely read. The authentication |
| 372 | * data in that packet is then substituted by the real data if it matches the |
| 373 | * fake data, and the channel is put into normal mode. |
| 374 | */ |
| 375 | int |
| 376 | x11_open_helper(Channel *c) |
| 377 | { |
| 378 | unsigned char *ucp; |
| 379 | unsigned int proto_len, data_len; |
| 380 | |
| 381 | /* Check if the fixed size part of the packet is in buffer. */ |
| 382 | if (buffer_len(&c->output) < 12) |
| 383 | return 0; |
| 384 | |
| 385 | /* Parse the lengths of variable-length fields. */ |
| 386 | ucp = (unsigned char *) buffer_ptr(&c->output); |
| 387 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
| 388 | proto_len = 256 * ucp[6] + ucp[7]; |
| 389 | data_len = 256 * ucp[8] + ucp[9]; |
| 390 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ |
| 391 | proto_len = ucp[6] + 256 * ucp[7]; |
| 392 | data_len = ucp[8] + 256 * ucp[9]; |
| 393 | } else { |
| 394 | debug("Initial X11 packet contains bad byte order byte: 0x%x", |
| 395 | ucp[0]); |
| 396 | return -1; |
| 397 | } |
| 398 | |
| 399 | /* Check if the whole packet is in buffer. */ |
| 400 | if (buffer_len(&c->output) < |
| 401 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
| 402 | return 0; |
| 403 | |
| 404 | /* Check if authentication protocol matches. */ |
| 405 | if (proto_len != strlen(x11_saved_proto) || |
| 406 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { |
| 407 | debug("X11 connection uses different authentication protocol."); |
| 408 | return -1; |
| 409 | } |
| 410 | /* Check if authentication data matches our fake data. */ |
| 411 | if (data_len != x11_fake_data_len || |
| 412 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), |
| 413 | x11_fake_data, x11_fake_data_len) != 0) { |
| 414 | debug("X11 auth data does not match fake data."); |
| 415 | return -1; |
| 416 | } |
| 417 | /* Check fake data length */ |
| 418 | if (x11_fake_data_len != x11_saved_data_len) { |
| 419 | error("X11 fake_data_len %d != saved_data_len %d", |
| 420 | x11_fake_data_len, x11_saved_data_len); |
| 421 | return -1; |
| 422 | } |
| 423 | /* |
| 424 | * Received authentication protocol and data match |
| 425 | * our fake data. Substitute the fake data with real |
| 426 | * data. |
| 427 | */ |
| 428 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), |
| 429 | x11_saved_data, x11_saved_data_len); |
| 430 | return 1; |
| 431 | } |
| 432 | |
| 433 | void |
| 434 | channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset) |
| 435 | { |
| 436 | int ret = x11_open_helper(c); |
| 437 | if (ret == 1) { |
| 438 | /* Start normal processing for the channel. */ |
| 439 | c->type = SSH_CHANNEL_OPEN; |
| 440 | } else if (ret == -1) { |
| 441 | /* |
| 442 | * We have received an X11 connection that has bad |
| 443 | * authentication information. |
| 444 | */ |
| 445 | log("X11 connection rejected because of wrong authentication.\r\n"); |
| 446 | buffer_clear(&c->input); |
| 447 | buffer_clear(&c->output); |
| 448 | close(c->sock); |
| 449 | c->sock = -1; |
| 450 | c->type = SSH_CHANNEL_CLOSED; |
| 451 | packet_start(SSH_MSG_CHANNEL_CLOSE); |
| 452 | packet_put_int(c->remote_id); |
| 453 | packet_send(); |
| 454 | } |
| 455 | } |
| 456 | |
| 457 | void |
| 458 | channel_pre_x11_open_15(Channel *c, fd_set * readset, fd_set * writeset) |
| 459 | { |
| 460 | int ret = x11_open_helper(c); |
| 461 | if (ret == 1) { |
| 462 | c->type = SSH_CHANNEL_OPEN; |
| 463 | } else if (ret == -1) { |
| 464 | debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
| 465 | chan_read_failed(c); |
| 466 | chan_write_failed(c); |
| 467 | debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
| 468 | } |
| 469 | } |
| 470 | |
| 471 | /* This is our fake X11 server socket. */ |
| 472 | void |
| 473 | channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 474 | { |
| 475 | struct sockaddr addr; |
| 476 | int newsock, newch; |
| 477 | socklen_t addrlen; |
| 478 | char buf[16384], *remote_hostname; |
| 479 | |
| 480 | if (FD_ISSET(c->sock, readset)) { |
| 481 | debug("X11 connection requested."); |
| 482 | addrlen = sizeof(addr); |
| 483 | newsock = accept(c->sock, &addr, &addrlen); |
| 484 | if (newsock < 0) { |
| 485 | error("accept: %.100s", strerror(errno)); |
| 486 | return; |
| 487 | } |
| 488 | remote_hostname = get_remote_hostname(newsock); |
| 489 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
| 490 | remote_hostname, get_peer_port(newsock)); |
| 491 | xfree(remote_hostname); |
| 492 | newch = channel_allocate(SSH_CHANNEL_OPENING, newsock, |
| 493 | xstrdup(buf)); |
| 494 | packet_start(SSH_SMSG_X11_OPEN); |
| 495 | packet_put_int(newch); |
| 496 | if (have_hostname_in_open) |
| 497 | packet_put_string(buf, strlen(buf)); |
| 498 | packet_send(); |
| 499 | } |
| 500 | } |
| 501 | |
| 502 | /* |
| 503 | * This socket is listening for connections to a forwarded TCP/IP port. |
| 504 | */ |
| 505 | void |
| 506 | channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 507 | { |
| 508 | struct sockaddr addr; |
| 509 | int newsock, newch; |
| 510 | socklen_t addrlen; |
| 511 | char buf[1024], *remote_hostname; |
| 512 | int remote_port; |
| 513 | |
| 514 | if (FD_ISSET(c->sock, readset)) { |
| 515 | debug("Connection to port %d forwarding " |
| 516 | "to %.100s port %d requested.", |
| 517 | c->listening_port, c->path, c->host_port); |
| 518 | addrlen = sizeof(addr); |
| 519 | newsock = accept(c->sock, &addr, &addrlen); |
| 520 | if (newsock < 0) { |
| 521 | error("accept: %.100s", strerror(errno)); |
| 522 | return; |
| 523 | } |
| 524 | remote_hostname = get_remote_hostname(newsock); |
| 525 | remote_port = get_peer_port(newsock); |
| 526 | snprintf(buf, sizeof buf, |
| 527 | "listen port %d for %.100s port %d, " |
| 528 | "connect from %.200s port %d", |
| 529 | c->listening_port, c->path, c->host_port, |
| 530 | remote_hostname, remote_port); |
| 531 | newch = channel_new("direct-tcpip", |
| 532 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
| 533 | c->local_window_max, c->local_maxpacket, |
| 534 | 0, xstrdup(buf)); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 535 | if (compat20) { |
| 536 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 537 | packet_put_cstring("direct-tcpip"); |
| 538 | packet_put_int(newch); |
| 539 | packet_put_int(c->local_window_max); |
| 540 | packet_put_int(c->local_maxpacket); |
| 541 | packet_put_string(c->path, strlen(c->path)); |
| 542 | packet_put_int(c->host_port); |
| 543 | packet_put_cstring(remote_hostname); |
| 544 | packet_put_int(remote_port); |
| 545 | packet_send(); |
| 546 | } else { |
| 547 | packet_start(SSH_MSG_PORT_OPEN); |
| 548 | packet_put_int(newch); |
| 549 | packet_put_string(c->path, strlen(c->path)); |
| 550 | packet_put_int(c->host_port); |
| 551 | if (have_hostname_in_open) { |
| 552 | packet_put_string(buf, strlen(buf)); |
| 553 | } |
| 554 | packet_send(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 555 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 556 | xfree(remote_hostname); |
| 557 | } |
| 558 | } |
| 559 | |
| 560 | /* |
| 561 | * This is the authentication agent socket listening for connections from |
| 562 | * clients. |
| 563 | */ |
| 564 | void |
| 565 | channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 566 | { |
| 567 | struct sockaddr addr; |
| 568 | int newsock, newch; |
| 569 | socklen_t addrlen; |
| 570 | |
| 571 | if (FD_ISSET(c->sock, readset)) { |
| 572 | addrlen = sizeof(addr); |
| 573 | newsock = accept(c->sock, &addr, &addrlen); |
| 574 | if (newsock < 0) { |
| 575 | error("accept from auth socket: %.100s", strerror(errno)); |
| 576 | return; |
| 577 | } |
| 578 | newch = channel_allocate(SSH_CHANNEL_OPENING, newsock, |
| 579 | xstrdup("accepted auth socket")); |
| 580 | packet_start(SSH_SMSG_AGENT_OPEN); |
| 581 | packet_put_int(newch); |
| 582 | packet_send(); |
| 583 | } |
| 584 | } |
| 585 | |
| 586 | int |
| 587 | channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset) |
| 588 | { |
| 589 | char buf[16*1024]; |
| 590 | int len; |
| 591 | |
| 592 | if (c->rfd != -1 && |
| 593 | FD_ISSET(c->rfd, readset)) { |
| 594 | len = read(c->rfd, buf, sizeof(buf)); |
| 595 | if (len <= 0) { |
| 596 | debug("channel %d: read<0 rfd %d len %d", |
| 597 | c->self, c->rfd, len); |
| 598 | if (compat13) { |
| 599 | buffer_consume(&c->output, buffer_len(&c->output)); |
| 600 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
| 601 | debug("Channel %d status set to input draining.", c->self); |
| 602 | } else { |
| 603 | chan_read_failed(c); |
| 604 | } |
| 605 | return -1; |
| 606 | } |
| 607 | buffer_append(&c->input, buf, len); |
| 608 | } |
| 609 | return 1; |
| 610 | } |
| 611 | int |
| 612 | channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset) |
| 613 | { |
| 614 | int len; |
| 615 | |
| 616 | /* Send buffered output data to the socket. */ |
| 617 | if (c->wfd != -1 && |
| 618 | FD_ISSET(c->wfd, writeset) && |
| 619 | buffer_len(&c->output) > 0) { |
| 620 | len = write(c->wfd, buffer_ptr(&c->output), |
| 621 | buffer_len(&c->output)); |
| 622 | if (len <= 0) { |
| 623 | if (compat13) { |
| 624 | buffer_consume(&c->output, buffer_len(&c->output)); |
| 625 | debug("Channel %d status set to input draining.", c->self); |
| 626 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
| 627 | } else { |
| 628 | chan_write_failed(c); |
| 629 | } |
| 630 | return -1; |
| 631 | } |
| 632 | buffer_consume(&c->output, len); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 633 | if (compat20 && len > 0) { |
| 634 | c->local_consumed += len; |
| 635 | } |
| 636 | } |
| 637 | return 1; |
| 638 | } |
| 639 | int |
| 640 | channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset) |
| 641 | { |
| 642 | char buf[16*1024]; |
| 643 | int len; |
| 644 | |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 645 | /** XXX handle drain efd, too */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 646 | if (c->efd != -1) { |
| 647 | if (c->extended_usage == CHAN_EXTENDED_WRITE && |
| 648 | FD_ISSET(c->efd, writeset) && |
| 649 | buffer_len(&c->extended) > 0) { |
| 650 | len = write(c->efd, buffer_ptr(&c->extended), |
| 651 | buffer_len(&c->extended)); |
| 652 | debug("channel %d: written %d to efd %d", |
| 653 | c->self, len, c->efd); |
| 654 | if (len > 0) { |
| 655 | buffer_consume(&c->extended, len); |
| 656 | c->local_consumed += len; |
| 657 | } |
| 658 | } else if (c->extended_usage == CHAN_EXTENDED_READ && |
| 659 | FD_ISSET(c->efd, readset)) { |
| 660 | len = read(c->efd, buf, sizeof(buf)); |
| 661 | debug("channel %d: read %d from efd %d", |
| 662 | c->self, len, c->efd); |
Damien Miller | 1383bd8 | 2000-04-06 12:32:37 +1000 | [diff] [blame] | 663 | if (len == 0) { |
| 664 | debug("channel %d: closing efd %d", |
| 665 | c->self, c->efd); |
| 666 | close(c->efd); |
| 667 | c->efd = -1; |
| 668 | } else if (len > 0) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 669 | buffer_append(&c->extended, buf, len); |
| 670 | } |
| 671 | } |
| 672 | return 1; |
| 673 | } |
| 674 | int |
| 675 | channel_check_window(Channel *c, fd_set * readset, fd_set * writeset) |
| 676 | { |
| 677 | if (!(c->flags & CHAN_CLOSE_SENT) && |
| 678 | c->local_window < c->local_window_max/2 && |
| 679 | c->local_consumed > 0) { |
| 680 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
| 681 | packet_put_int(c->remote_id); |
| 682 | packet_put_int(c->local_consumed); |
| 683 | packet_send(); |
| 684 | debug("channel %d: window %d sent adjust %d", |
| 685 | c->self, c->local_window, |
| 686 | c->local_consumed); |
| 687 | c->local_window += c->local_consumed; |
| 688 | c->local_consumed = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 689 | } |
| 690 | return 1; |
| 691 | } |
| 692 | |
| 693 | void |
| 694 | channel_post_open_1(Channel *c, fd_set * readset, fd_set * writeset) |
| 695 | { |
| 696 | channel_handle_rfd(c, readset, writeset); |
| 697 | channel_handle_wfd(c, readset, writeset); |
| 698 | } |
| 699 | |
| 700 | void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 701 | channel_post_open_2(Channel *c, fd_set * readset, fd_set * writeset) |
| 702 | { |
| 703 | channel_handle_rfd(c, readset, writeset); |
| 704 | channel_handle_wfd(c, readset, writeset); |
| 705 | channel_handle_efd(c, readset, writeset); |
| 706 | channel_check_window(c, readset, writeset); |
| 707 | } |
| 708 | |
| 709 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 710 | channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset) |
| 711 | { |
| 712 | int len; |
| 713 | /* Send buffered output data to the socket. */ |
| 714 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { |
| 715 | len = write(c->sock, buffer_ptr(&c->output), |
| 716 | buffer_len(&c->output)); |
| 717 | if (len <= 0) |
| 718 | buffer_consume(&c->output, buffer_len(&c->output)); |
| 719 | else |
| 720 | buffer_consume(&c->output, len); |
| 721 | } |
| 722 | } |
| 723 | |
| 724 | void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 725 | channel_handler_init_20(void) |
| 726 | { |
| 727 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_20; |
| 728 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
| 729 | |
| 730 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_2; |
| 731 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
| 732 | } |
| 733 | |
| 734 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 735 | channel_handler_init_13(void) |
| 736 | { |
| 737 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; |
| 738 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; |
| 739 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
| 740 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
| 741 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
| 742 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; |
| 743 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; |
| 744 | |
| 745 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1; |
| 746 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
| 747 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
| 748 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
| 749 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; |
| 750 | } |
| 751 | |
| 752 | void |
| 753 | channel_handler_init_15(void) |
| 754 | { |
| 755 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_15; |
| 756 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_15; |
| 757 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
| 758 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
| 759 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
| 760 | |
| 761 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
| 762 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
| 763 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
| 764 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1; |
| 765 | } |
| 766 | |
| 767 | void |
| 768 | channel_handler_init(void) |
| 769 | { |
| 770 | int i; |
| 771 | for(i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
| 772 | channel_pre[i] = NULL; |
| 773 | channel_post[i] = NULL; |
| 774 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 775 | if (compat20) |
| 776 | channel_handler_init_20(); |
| 777 | else if (compat13) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 778 | channel_handler_init_13(); |
| 779 | else |
| 780 | channel_handler_init_15(); |
| 781 | } |
| 782 | |
| 783 | void |
| 784 | channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset) |
| 785 | { |
| 786 | static int did_init = 0; |
| 787 | int i; |
| 788 | Channel *c; |
| 789 | |
| 790 | if (!did_init) { |
| 791 | channel_handler_init(); |
| 792 | did_init = 1; |
| 793 | } |
| 794 | for (i = 0; i < channels_alloc; i++) { |
| 795 | c = &channels[i]; |
| 796 | if (c->type == SSH_CHANNEL_FREE) |
| 797 | continue; |
| 798 | if (ftab[c->type] == NULL) |
| 799 | continue; |
| 800 | (*ftab[c->type])(c, readset, writeset); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 801 | chan_delete_if_full_closed(c); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 802 | } |
| 803 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 804 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 805 | void |
| 806 | channel_prepare_select(fd_set * readset, fd_set * writeset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 807 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 808 | channel_handler(channel_pre, readset, writeset); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 809 | } |
| 810 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 811 | void |
| 812 | channel_after_select(fd_set * readset, fd_set * writeset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 813 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 814 | channel_handler(channel_post, readset, writeset); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 815 | } |
| 816 | |
| 817 | /* If there is data to send to the connection, send some of it now. */ |
| 818 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 819 | void |
| 820 | channel_output_poll() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 821 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 822 | int len, i; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 823 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 824 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 825 | for (i = 0; i < channels_alloc; i++) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 826 | c = &channels[i]; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 827 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 828 | /* We are only interested in channels that can have buffered incoming data. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 829 | if (compat13) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 830 | if (c->type != SSH_CHANNEL_OPEN && |
| 831 | c->type != SSH_CHANNEL_INPUT_DRAINING) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 832 | continue; |
| 833 | } else { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 834 | if (c->type != SSH_CHANNEL_OPEN) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 835 | continue; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 836 | if (c->istate != CHAN_INPUT_OPEN && |
| 837 | c->istate != CHAN_INPUT_WAIT_DRAIN) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 838 | continue; |
| 839 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 840 | if (compat20 && (c->flags & CHAN_CLOSE_SENT)) { |
| 841 | debug("channel: %d: no data after CLOSE", c->self); |
| 842 | continue; |
| 843 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 844 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 845 | /* Get the amount of buffered data for this channel. */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 846 | len = buffer_len(&c->input); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 847 | if (len > 0) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 848 | /* Send some data for the other side over the secure connection. */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 849 | if (compat20) { |
| 850 | if (len > c->remote_window) |
| 851 | len = c->remote_window; |
| 852 | if (len > c->remote_maxpacket) |
| 853 | len = c->remote_maxpacket; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 854 | } else { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 855 | if (packet_is_interactive()) { |
| 856 | if (len > 1024) |
| 857 | len = 512; |
| 858 | } else { |
| 859 | /* Keep the packets at reasonable size. */ |
| 860 | if (len > packet_get_maxsize()/2) |
| 861 | len = packet_get_maxsize()/2; |
| 862 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 863 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 864 | if (len > 0) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 865 | packet_start(compat20 ? |
| 866 | SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 867 | packet_put_int(c->remote_id); |
| 868 | packet_put_string(buffer_ptr(&c->input), len); |
| 869 | packet_send(); |
| 870 | buffer_consume(&c->input, len); |
| 871 | c->remote_window -= len; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 872 | debug("channel %d: send data len %d", c->self, len); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 873 | } |
| 874 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 875 | if (compat13) |
| 876 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 877 | /* |
| 878 | * input-buffer is empty and read-socket shutdown: |
| 879 | * tell peer, that we will not send more data: send IEOF |
| 880 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 881 | chan_ibuf_empty(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 882 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 883 | /* Send extended data, i.e. stderr */ |
| 884 | if (compat20 && |
| 885 | c->remote_window > 0 && |
| 886 | (len = buffer_len(&c->extended)) > 0 && |
| 887 | c->extended_usage == CHAN_EXTENDED_READ) { |
| 888 | if (len > c->remote_window) |
| 889 | len = c->remote_window; |
| 890 | if (len > c->remote_maxpacket) |
| 891 | len = c->remote_maxpacket; |
| 892 | packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA); |
| 893 | packet_put_int(c->remote_id); |
| 894 | packet_put_int(SSH2_EXTENDED_DATA_STDERR); |
| 895 | packet_put_string(buffer_ptr(&c->extended), len); |
| 896 | packet_send(); |
| 897 | buffer_consume(&c->extended, len); |
| 898 | c->remote_window -= len; |
| 899 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 900 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 901 | } |
| 902 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 903 | /* |
| 904 | * This is called when a packet of type CHANNEL_DATA has just been received. |
| 905 | * The message type has already been consumed, but channel number and data is |
| 906 | * still there. |
| 907 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 908 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 909 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 910 | channel_input_data(int type, int plen) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 911 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 912 | int id; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 913 | char *data; |
| 914 | unsigned int data_len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 915 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 916 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 917 | /* Get the channel number and verify it. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 918 | id = packet_get_int(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 919 | c = channel_lookup(id); |
| 920 | if (c == NULL) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 921 | packet_disconnect("Received data for nonexistent channel %d.", id); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 922 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 923 | /* Ignore any data for non-open channels (might happen on close) */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 924 | if (c->type != SSH_CHANNEL_OPEN && |
| 925 | c->type != SSH_CHANNEL_X11_OPEN) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 926 | return; |
| 927 | |
| 928 | /* same for protocol 1.5 if output end is no longer open */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 929 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 930 | return; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 931 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 932 | /* Get the data. */ |
| 933 | data = packet_get_string(&data_len); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 934 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 935 | if (compat20){ |
| 936 | if (data_len > c->local_maxpacket) { |
| 937 | log("channel %d: rcvd big packet %d, maxpack %d", |
| 938 | c->self, data_len, c->local_maxpacket); |
| 939 | } |
| 940 | if (data_len > c->local_window) { |
| 941 | log("channel %d: rcvd too much data %d, win %d", |
| 942 | c->self, data_len, c->local_window); |
| 943 | xfree(data); |
| 944 | return; |
| 945 | } |
| 946 | c->local_window -= data_len; |
| 947 | }else{ |
| 948 | packet_integrity_check(plen, 4 + 4 + data_len, type); |
| 949 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 950 | buffer_append(&c->output, data, data_len); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 951 | xfree(data); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 952 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 953 | void |
| 954 | channel_input_extended_data(int type, int plen) |
| 955 | { |
| 956 | int id; |
| 957 | int tcode; |
| 958 | char *data; |
| 959 | unsigned int data_len; |
| 960 | Channel *c; |
| 961 | |
| 962 | /* Get the channel number and verify it. */ |
| 963 | id = packet_get_int(); |
| 964 | c = channel_lookup(id); |
| 965 | |
| 966 | if (c == NULL) |
| 967 | packet_disconnect("Received extended_data for bad channel %d.", id); |
| 968 | if (c->type != SSH_CHANNEL_OPEN) { |
| 969 | log("channel %d: ext data for non open", id); |
| 970 | return; |
| 971 | } |
| 972 | tcode = packet_get_int(); |
| 973 | if (c->efd == -1 || |
| 974 | c->extended_usage != CHAN_EXTENDED_WRITE || |
| 975 | tcode != SSH2_EXTENDED_DATA_STDERR) { |
| 976 | log("channel %d: bad ext data", c->self); |
| 977 | return; |
| 978 | } |
| 979 | data = packet_get_string(&data_len); |
| 980 | if (data_len > c->local_window) { |
| 981 | log("channel %d: rcvd too much extended_data %d, win %d", |
| 982 | c->self, data_len, c->local_window); |
| 983 | xfree(data); |
| 984 | return; |
| 985 | } |
| 986 | debug("channel %d: rcvd ext data %d", c->self, data_len); |
| 987 | c->local_window -= data_len; |
| 988 | buffer_append(&c->extended, data, data_len); |
| 989 | xfree(data); |
| 990 | } |
| 991 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 992 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 993 | /* |
| 994 | * Returns true if no channel has too much buffered data, and false if one or |
| 995 | * more channel is overfull. |
| 996 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 997 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 998 | int |
| 999 | channel_not_very_much_buffered_data() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1000 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1001 | unsigned int i; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1002 | Channel *c; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1003 | |
| 1004 | for (i = 0; i < channels_alloc; i++) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1005 | c = &channels[i]; |
| 1006 | if (c->type == SSH_CHANNEL_OPEN) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1007 | if (!compat20 && buffer_len(&c->input) > packet_get_maxsize()) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1008 | debug("channel %d: big input buffer %d", |
| 1009 | c->self, buffer_len(&c->input)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1010 | return 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1011 | } |
| 1012 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
| 1013 | debug("channel %d: big output buffer %d", |
| 1014 | c->self, buffer_len(&c->output)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1015 | return 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1016 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1017 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1018 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1019 | return 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1020 | } |
| 1021 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1022 | void |
| 1023 | channel_input_ieof(int type, int plen) |
| 1024 | { |
| 1025 | int id; |
| 1026 | Channel *c; |
| 1027 | |
| 1028 | packet_integrity_check(plen, 4, type); |
| 1029 | |
| 1030 | id = packet_get_int(); |
| 1031 | c = channel_lookup(id); |
| 1032 | if (c == NULL) |
| 1033 | packet_disconnect("Received ieof for nonexistent channel %d.", id); |
| 1034 | chan_rcvd_ieof(c); |
| 1035 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1036 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1037 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1038 | channel_input_close(int type, int plen) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1039 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1040 | int id; |
| 1041 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1042 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1043 | packet_integrity_check(plen, 4, type); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1044 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1045 | id = packet_get_int(); |
| 1046 | c = channel_lookup(id); |
| 1047 | if (c == NULL) |
| 1048 | packet_disconnect("Received close for nonexistent channel %d.", id); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1049 | |
| 1050 | /* |
| 1051 | * Send a confirmation that we have closed the channel and no more |
| 1052 | * data is coming for it. |
| 1053 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1054 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1055 | packet_put_int(c->remote_id); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1056 | packet_send(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1057 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1058 | /* |
| 1059 | * If the channel is in closed state, we have sent a close request, |
| 1060 | * and the other side will eventually respond with a confirmation. |
| 1061 | * Thus, we cannot free the channel here, because then there would be |
| 1062 | * no-one to receive the confirmation. The channel gets freed when |
| 1063 | * the confirmation arrives. |
| 1064 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1065 | if (c->type != SSH_CHANNEL_CLOSED) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1066 | /* |
| 1067 | * Not a closed channel - mark it as draining, which will |
| 1068 | * cause it to be freed later. |
| 1069 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1070 | buffer_consume(&c->input, buffer_len(&c->input)); |
| 1071 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1072 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1073 | } |
| 1074 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1075 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1076 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1077 | channel_input_oclose(int type, int plen) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1078 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1079 | int id = packet_get_int(); |
| 1080 | Channel *c = channel_lookup(id); |
| 1081 | packet_integrity_check(plen, 4, type); |
| 1082 | if (c == NULL) |
| 1083 | packet_disconnect("Received oclose for nonexistent channel %d.", id); |
| 1084 | chan_rcvd_oclose(c); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1085 | } |
| 1086 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1087 | void |
| 1088 | channel_input_close_confirmation(int type, int plen) |
| 1089 | { |
| 1090 | int id = packet_get_int(); |
| 1091 | Channel *c = channel_lookup(id); |
| 1092 | |
| 1093 | if (c == NULL) |
| 1094 | packet_disconnect("Received close confirmation for " |
| 1095 | "out-of-range channel %d.", id); |
| 1096 | if (c->type != SSH_CHANNEL_CLOSED) |
| 1097 | packet_disconnect("Received close confirmation for " |
| 1098 | "non-closed channel %d (type %d).", id, c->type); |
| 1099 | channel_free(c->self); |
| 1100 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1101 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1102 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1103 | channel_input_open_confirmation(int type, int plen) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1104 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1105 | int id, remote_id; |
| 1106 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1107 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1108 | if (!compat20) |
| 1109 | packet_integrity_check(plen, 4 + 4, type); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1110 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1111 | id = packet_get_int(); |
| 1112 | c = channel_lookup(id); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1113 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1114 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
| 1115 | packet_disconnect("Received open confirmation for " |
| 1116 | "non-opening channel %d.", id); |
| 1117 | remote_id = packet_get_int(); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1118 | /* 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] | 1119 | c->remote_id = remote_id; |
| 1120 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1121 | |
| 1122 | if (compat20) { |
| 1123 | c->remote_window = packet_get_int(); |
| 1124 | c->remote_maxpacket = packet_get_int(); |
| 1125 | if (c->cb_fn != NULL && c->cb_event == type) { |
| 1126 | debug("callback start"); |
| 1127 | c->cb_fn(c->self, c->cb_arg); |
| 1128 | debug("callback done"); |
| 1129 | } |
| 1130 | debug("channel %d: open confirm rwindow %d rmax %d", c->self, |
| 1131 | c->remote_window, c->remote_maxpacket); |
| 1132 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1133 | } |
| 1134 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1135 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1136 | channel_input_open_failure(int type, int plen) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1137 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1138 | int id; |
| 1139 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1140 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1141 | if (!compat20) |
| 1142 | packet_integrity_check(plen, 4, type); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1143 | |
| 1144 | id = packet_get_int(); |
| 1145 | c = channel_lookup(id); |
| 1146 | |
| 1147 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
| 1148 | packet_disconnect("Received open failure for " |
| 1149 | "non-opening channel %d.", id); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1150 | if (compat20) { |
| 1151 | int reason = packet_get_int(); |
| 1152 | char *msg = packet_get_string(NULL); |
| 1153 | log("channel_open_failure: %d: reason %d: %s", id, reason, msg); |
| 1154 | xfree(msg); |
| 1155 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1156 | /* Free the channel. This will also close the socket. */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1157 | channel_free(id); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1158 | } |
| 1159 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1160 | void |
| 1161 | channel_input_channel_request(int type, int plen) |
| 1162 | { |
| 1163 | int id; |
| 1164 | Channel *c; |
| 1165 | |
| 1166 | id = packet_get_int(); |
| 1167 | c = channel_lookup(id); |
| 1168 | |
| 1169 | if (c == NULL || |
| 1170 | (c->type != SSH_CHANNEL_OPEN && c->type != SSH_CHANNEL_LARVAL)) |
| 1171 | packet_disconnect("Received request for " |
| 1172 | "non-open channel %d.", id); |
| 1173 | if (c->cb_fn != NULL && c->cb_event == type) { |
| 1174 | debug("callback start"); |
| 1175 | c->cb_fn(c->self, c->cb_arg); |
| 1176 | debug("callback done"); |
| 1177 | } else { |
| 1178 | char *service = packet_get_string(NULL); |
| 1179 | debug("channel: %d rcvd request for %s", c->self, service); |
| 1180 | debug("cb_fn %p cb_event %d", c->cb_fn , c->cb_event); |
| 1181 | xfree(service); |
| 1182 | } |
| 1183 | } |
| 1184 | |
| 1185 | void |
| 1186 | channel_input_window_adjust(int type, int plen) |
| 1187 | { |
| 1188 | Channel *c; |
| 1189 | int id, adjust; |
| 1190 | |
| 1191 | if (!compat20) |
| 1192 | return; |
| 1193 | |
| 1194 | /* Get the channel number and verify it. */ |
| 1195 | id = packet_get_int(); |
| 1196 | c = channel_lookup(id); |
| 1197 | |
| 1198 | if (c == NULL || c->type != SSH_CHANNEL_OPEN) { |
| 1199 | log("Received window adjust for " |
| 1200 | "non-open channel %d.", id); |
| 1201 | return; |
| 1202 | } |
| 1203 | adjust = packet_get_int(); |
| 1204 | debug("channel %d: rcvd adjust %d", id, adjust); |
| 1205 | c->remote_window += adjust; |
| 1206 | } |
| 1207 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1208 | /* |
| 1209 | * Stops listening for channels, and removes any unix domain sockets that we |
| 1210 | * might have. |
| 1211 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1212 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1213 | void |
| 1214 | channel_stop_listening() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1215 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1216 | int i; |
| 1217 | for (i = 0; i < channels_alloc; i++) { |
| 1218 | switch (channels[i].type) { |
| 1219 | case SSH_CHANNEL_AUTH_SOCKET: |
| 1220 | close(channels[i].sock); |
| 1221 | remove(channels[i].path); |
| 1222 | channel_free(i); |
| 1223 | break; |
| 1224 | case SSH_CHANNEL_PORT_LISTENER: |
| 1225 | case SSH_CHANNEL_X11_LISTENER: |
| 1226 | close(channels[i].sock); |
| 1227 | channel_free(i); |
| 1228 | break; |
| 1229 | default: |
| 1230 | break; |
| 1231 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1232 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1233 | } |
| 1234 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1235 | /* |
| 1236 | * Closes the sockets of all channels. This is used to close extra file |
| 1237 | * descriptors after a fork. |
| 1238 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1239 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1240 | void |
| 1241 | channel_close_all() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1242 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1243 | int i; |
| 1244 | for (i = 0; i < channels_alloc; i++) { |
| 1245 | if (channels[i].type != SSH_CHANNEL_FREE) |
| 1246 | close(channels[i].sock); |
| 1247 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1248 | } |
| 1249 | |
| 1250 | /* Returns the maximum file descriptor number used by the channels. */ |
| 1251 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1252 | int |
| 1253 | channel_max_fd() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1254 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1255 | return channel_max_fd_value; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1256 | } |
| 1257 | |
| 1258 | /* Returns true if any channel is still open. */ |
| 1259 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1260 | int |
| 1261 | channel_still_open() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1262 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1263 | unsigned int i; |
| 1264 | for (i = 0; i < channels_alloc; i++) |
| 1265 | switch (channels[i].type) { |
| 1266 | case SSH_CHANNEL_FREE: |
| 1267 | case SSH_CHANNEL_X11_LISTENER: |
| 1268 | case SSH_CHANNEL_PORT_LISTENER: |
| 1269 | case SSH_CHANNEL_CLOSED: |
| 1270 | case SSH_CHANNEL_AUTH_SOCKET: |
| 1271 | continue; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1272 | case SSH_CHANNEL_LARVAL: |
| 1273 | if (!compat20) |
| 1274 | fatal("cannot happen: SSH_CHANNEL_LARVAL"); |
| 1275 | continue; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1276 | case SSH_CHANNEL_OPENING: |
| 1277 | case SSH_CHANNEL_OPEN: |
| 1278 | case SSH_CHANNEL_X11_OPEN: |
| 1279 | return 1; |
| 1280 | case SSH_CHANNEL_INPUT_DRAINING: |
| 1281 | case SSH_CHANNEL_OUTPUT_DRAINING: |
| 1282 | if (!compat13) |
| 1283 | fatal("cannot happen: OUT_DRAIN"); |
| 1284 | return 1; |
| 1285 | default: |
| 1286 | fatal("channel_still_open: bad channel type %d", channels[i].type); |
| 1287 | /* NOTREACHED */ |
| 1288 | } |
| 1289 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1290 | } |
| 1291 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1292 | /* |
| 1293 | * Returns a message describing the currently open forwarded connections, |
| 1294 | * suitable for sending to the client. The message contains crlf pairs for |
| 1295 | * newlines. |
| 1296 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1297 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1298 | char * |
| 1299 | channel_open_message() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1300 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1301 | Buffer buffer; |
| 1302 | int i; |
| 1303 | char buf[512], *cp; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1304 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1305 | buffer_init(&buffer); |
| 1306 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1307 | buffer_append(&buffer, buf, strlen(buf)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1308 | for (i = 0; i < channels_alloc; i++) { |
| 1309 | Channel *c = &channels[i]; |
| 1310 | switch (c->type) { |
| 1311 | case SSH_CHANNEL_FREE: |
| 1312 | case SSH_CHANNEL_X11_LISTENER: |
| 1313 | case SSH_CHANNEL_PORT_LISTENER: |
| 1314 | case SSH_CHANNEL_CLOSED: |
| 1315 | case SSH_CHANNEL_AUTH_SOCKET: |
| 1316 | continue; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1317 | case SSH_CHANNEL_LARVAL: |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1318 | case SSH_CHANNEL_OPENING: |
| 1319 | case SSH_CHANNEL_OPEN: |
| 1320 | case SSH_CHANNEL_X11_OPEN: |
| 1321 | case SSH_CHANNEL_INPUT_DRAINING: |
| 1322 | case SSH_CHANNEL_OUTPUT_DRAINING: |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1323 | snprintf(buf, sizeof buf, " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n", |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1324 | c->self, c->remote_name, |
| 1325 | c->type, c->remote_id, |
| 1326 | c->istate, buffer_len(&c->input), |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1327 | c->ostate, buffer_len(&c->output), |
| 1328 | c->rfd, c->wfd); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1329 | buffer_append(&buffer, buf, strlen(buf)); |
| 1330 | continue; |
| 1331 | default: |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1332 | fatal("channel_open_message: bad channel type %d", c->type); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1333 | /* NOTREACHED */ |
| 1334 | } |
| 1335 | } |
| 1336 | buffer_append(&buffer, "\0", 1); |
| 1337 | cp = xstrdup(buffer_ptr(&buffer)); |
| 1338 | buffer_free(&buffer); |
| 1339 | return cp; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1340 | } |
| 1341 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1342 | /* |
| 1343 | * Initiate forwarding of connections to local port "port" through the secure |
| 1344 | * channel to host:port from remote side. |
| 1345 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1346 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1347 | void |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 1348 | channel_request_local_forwarding(u_short port, const char *host, |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 1349 | u_short host_port, int gateway_ports) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1350 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1351 | int success, ch, sock, on = 1; |
| 1352 | struct addrinfo hints, *ai, *aitop; |
| 1353 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1354 | struct linger linger; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1355 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1356 | if (strlen(host) > sizeof(channels[0].path) - 1) |
| 1357 | packet_disconnect("Forward host name too long."); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1358 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1359 | /* |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1360 | * getaddrinfo returns a loopback address if the hostname is |
| 1361 | * set to NULL and hints.ai_flags is not AI_PASSIVE |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1362 | */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1363 | memset(&hints, 0, sizeof(hints)); |
| 1364 | hints.ai_family = IPv4or6; |
| 1365 | hints.ai_flags = gateway_ports ? AI_PASSIVE : 0; |
| 1366 | hints.ai_socktype = SOCK_STREAM; |
| 1367 | snprintf(strport, sizeof strport, "%d", port); |
| 1368 | if (getaddrinfo(NULL, strport, &hints, &aitop) != 0) |
| 1369 | packet_disconnect("getaddrinfo: fatal error"); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1370 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1371 | success = 0; |
| 1372 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 1373 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 1374 | continue; |
| 1375 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
| 1376 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
| 1377 | error("channel_request_local_forwarding: getnameinfo failed"); |
| 1378 | continue; |
| 1379 | } |
| 1380 | /* Create a port to listen for the host. */ |
| 1381 | sock = socket(ai->ai_family, SOCK_STREAM, 0); |
| 1382 | if (sock < 0) { |
| 1383 | /* this is no error since kernel may not support ipv6 */ |
| 1384 | verbose("socket: %.100s", strerror(errno)); |
| 1385 | continue; |
| 1386 | } |
| 1387 | /* |
| 1388 | * Set socket options. We would like the socket to disappear |
| 1389 | * as soon as it has been closed for whatever reason. |
| 1390 | */ |
| 1391 | setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)); |
| 1392 | linger.l_onoff = 1; |
| 1393 | linger.l_linger = 5; |
| 1394 | setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger)); |
| 1395 | debug("Local forwarding listening on %s port %s.", ntop, strport); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1396 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1397 | /* Bind the socket to the address. */ |
| 1398 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
| 1399 | /* address can be in use ipv6 address is already bound */ |
Damien Miller | 3c7eeb2 | 2000-03-03 22:35:33 +1100 | [diff] [blame] | 1400 | if (!ai->ai_next) |
| 1401 | error("bind: %.100s", strerror(errno)); |
| 1402 | else |
| 1403 | verbose("bind: %.100s", strerror(errno)); |
| 1404 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1405 | close(sock); |
| 1406 | continue; |
| 1407 | } |
| 1408 | /* Start listening for connections on the socket. */ |
| 1409 | if (listen(sock, 5) < 0) { |
| 1410 | error("listen: %.100s", strerror(errno)); |
| 1411 | close(sock); |
| 1412 | continue; |
| 1413 | } |
| 1414 | /* Allocate a channel number for the socket. */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1415 | ch = channel_new( |
| 1416 | "port listener", SSH_CHANNEL_PORT_LISTENER, |
| 1417 | sock, sock, -1, |
| 1418 | CHAN_WINDOW_DEFAULT, CHAN_PACKET_DEFAULT, |
| 1419 | 0, xstrdup("port listener")); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1420 | strlcpy(channels[ch].path, host, sizeof(channels[ch].path)); |
| 1421 | channels[ch].host_port = host_port; |
| 1422 | channels[ch].listening_port = port; |
| 1423 | success = 1; |
| 1424 | } |
| 1425 | if (success == 0) |
| 1426 | packet_disconnect("cannot listen port: %d", port); |
| 1427 | freeaddrinfo(aitop); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1428 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1429 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1430 | /* |
| 1431 | * Initiate forwarding of connections to port "port" on remote host through |
| 1432 | * the secure channel to host:port from local side. |
| 1433 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1434 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1435 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1436 | channel_request_remote_forwarding(u_short listen_port, const char *host_to_connect, |
| 1437 | u_short port_to_connect) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1438 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1439 | int payload_len; |
| 1440 | /* Record locally that connection to this host/port is permitted. */ |
| 1441 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) |
| 1442 | fatal("channel_request_remote_forwarding: too many forwards"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1443 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1444 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); |
| 1445 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; |
| 1446 | permitted_opens[num_permitted_opens].listen_port = listen_port; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1447 | num_permitted_opens++; |
| 1448 | |
| 1449 | /* Send the forward request to the remote side. */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 1450 | if (compat20) { |
| 1451 | const char *address_to_bind = "0.0.0.0"; |
| 1452 | packet_start(SSH2_MSG_GLOBAL_REQUEST); |
| 1453 | packet_put_cstring("tcpip-forward"); |
| 1454 | packet_put_char(0); /* boolean: want reply */ |
| 1455 | packet_put_cstring(address_to_bind); |
| 1456 | packet_put_int(listen_port); |
| 1457 | } else { |
| 1458 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); |
| 1459 | packet_put_int(port_to_connect); |
| 1460 | packet_put_cstring(host_to_connect); |
| 1461 | packet_put_int(listen_port); |
| 1462 | packet_send(); |
| 1463 | packet_write_wait(); |
| 1464 | /* |
| 1465 | * Wait for response from the remote side. It will send a disconnect |
| 1466 | * message on failure, and we will never see it here. |
| 1467 | */ |
| 1468 | packet_read_expect(&payload_len, SSH_SMSG_SUCCESS); |
| 1469 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1470 | } |
| 1471 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1472 | /* |
| 1473 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates |
| 1474 | * listening for the port, and sends back a success reply (or disconnect |
| 1475 | * message if there was an error). This never returns if there was an error. |
| 1476 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1477 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1478 | void |
| 1479 | channel_input_port_forward_request(int is_root) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1480 | { |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 1481 | u_short port, host_port; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1482 | char *hostname; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1483 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1484 | /* Get arguments from the packet. */ |
| 1485 | port = packet_get_int(); |
| 1486 | hostname = packet_get_string(NULL); |
| 1487 | host_port = packet_get_int(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1488 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1489 | /* |
| 1490 | * Check that an unprivileged user is not trying to forward a |
| 1491 | * privileged port. |
| 1492 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1493 | if (port < IPPORT_RESERVED && !is_root) |
| 1494 | packet_disconnect("Requested forwarding of port %d but user is not root.", |
| 1495 | port); |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 1496 | /* |
| 1497 | * Initiate forwarding, |
| 1498 | * bind port to localhost only (gateway ports == 0). |
| 1499 | */ |
| 1500 | channel_request_local_forwarding(port, hostname, host_port, 0); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1501 | |
| 1502 | /* Free the argument string. */ |
| 1503 | xfree(hostname); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1504 | } |
| 1505 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1506 | /* XXX move to aux.c */ |
| 1507 | int |
| 1508 | channel_connect_to(const char *host, u_short host_port) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1509 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1510 | struct addrinfo hints, *ai, *aitop; |
| 1511 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
| 1512 | int gaierr; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1513 | int sock = -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1514 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1515 | memset(&hints, 0, sizeof(hints)); |
| 1516 | hints.ai_family = IPv4or6; |
| 1517 | hints.ai_socktype = SOCK_STREAM; |
| 1518 | snprintf(strport, sizeof strport, "%d", host_port); |
| 1519 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { |
| 1520 | error("%.100s: unknown host (%s)", host, gai_strerror(gaierr)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1521 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1522 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1523 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 1524 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 1525 | continue; |
| 1526 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
| 1527 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1528 | error("channel_connect_to: getnameinfo failed"); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1529 | continue; |
| 1530 | } |
| 1531 | /* Create the socket. */ |
| 1532 | sock = socket(ai->ai_family, SOCK_STREAM, 0); |
| 1533 | if (sock < 0) { |
| 1534 | error("socket: %.100s", strerror(errno)); |
| 1535 | continue; |
| 1536 | } |
| 1537 | /* Connect to the host/port. */ |
| 1538 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
| 1539 | error("connect %.100s port %s: %.100s", ntop, strport, |
| 1540 | strerror(errno)); |
| 1541 | close(sock); |
| 1542 | continue; /* fail -- try next */ |
| 1543 | } |
| 1544 | break; /* success */ |
| 1545 | |
| 1546 | } |
| 1547 | freeaddrinfo(aitop); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1548 | if (!ai) { |
| 1549 | error("connect %.100s port %d: failed.", host, host_port); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1550 | return -1; |
| 1551 | } |
| 1552 | /* success */ |
| 1553 | return sock; |
| 1554 | } |
| 1555 | |
| 1556 | /* |
| 1557 | * This is called after receiving PORT_OPEN message. This attempts to |
| 1558 | * connect to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION |
| 1559 | * or CHANNEL_OPEN_FAILURE. |
| 1560 | */ |
| 1561 | |
| 1562 | void |
| 1563 | channel_input_port_open(int type, int plen) |
| 1564 | { |
| 1565 | u_short host_port; |
| 1566 | char *host, *originator_string; |
| 1567 | int remote_channel, sock = -1, newch, i, denied; |
| 1568 | unsigned int host_len, originator_len; |
| 1569 | |
| 1570 | /* Get remote channel number. */ |
| 1571 | remote_channel = packet_get_int(); |
| 1572 | |
| 1573 | /* Get host name to connect to. */ |
| 1574 | host = packet_get_string(&host_len); |
| 1575 | |
| 1576 | /* Get port to connect to. */ |
| 1577 | host_port = packet_get_int(); |
| 1578 | |
| 1579 | /* Get remote originator name. */ |
| 1580 | if (have_hostname_in_open) { |
| 1581 | originator_string = packet_get_string(&originator_len); |
| 1582 | originator_len += 4; /* size of packet_int */ |
| 1583 | } else { |
| 1584 | originator_string = xstrdup("unknown (remote did not supply name)"); |
| 1585 | originator_len = 0; /* no originator supplied */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1586 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1587 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1588 | packet_integrity_check(plen, |
| 1589 | 4 + 4 + host_len + 4 + originator_len, SSH_MSG_PORT_OPEN); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1590 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1591 | /* Check if opening that port is permitted. */ |
| 1592 | denied = 0; |
| 1593 | if (!all_opens_permitted) { |
| 1594 | /* Go trough all permitted ports. */ |
| 1595 | for (i = 0; i < num_permitted_opens; i++) |
| 1596 | if (permitted_opens[i].port_to_connect == host_port && |
| 1597 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
| 1598 | break; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1599 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1600 | /* Check if we found the requested port among those permitted. */ |
| 1601 | if (i >= num_permitted_opens) { |
| 1602 | /* The port is not permitted. */ |
| 1603 | log("Received request to connect to %.100s:%d, but the request was denied.", |
| 1604 | host, host_port); |
| 1605 | denied = 1; |
| 1606 | } |
| 1607 | } |
| 1608 | sock = denied ? -1 : channel_connect_to(host, host_port); |
| 1609 | if (sock > 0) { |
| 1610 | /* Allocate a channel for this connection. */ |
| 1611 | newch = channel_allocate(SSH_CHANNEL_OPEN, sock, originator_string); |
| 1612 | channels[newch].remote_id = remote_channel; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1613 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1614 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1615 | packet_put_int(remote_channel); |
| 1616 | packet_put_int(newch); |
| 1617 | packet_send(); |
| 1618 | } else { |
| 1619 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 1620 | packet_put_int(remote_channel); |
| 1621 | packet_send(); |
| 1622 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1623 | xfree(host); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1624 | } |
| 1625 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1626 | /* |
| 1627 | * Creates an internet domain socket for listening for X11 connections. |
| 1628 | * Returns a suitable value for the DISPLAY variable, or NULL if an error |
| 1629 | * occurs. |
| 1630 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1631 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1632 | #define NUM_SOCKS 10 |
| 1633 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1634 | char * |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 1635 | x11_create_display_inet(int screen_number, int x11_display_offset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1636 | { |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 1637 | int display_number, sock; |
| 1638 | u_short port; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1639 | struct addrinfo hints, *ai, *aitop; |
| 1640 | char strport[NI_MAXSERV]; |
| 1641 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; |
| 1642 | char display[512]; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1643 | char hostname[MAXHOSTNAMELEN]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1644 | |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 1645 | for (display_number = x11_display_offset; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1646 | display_number < MAX_DISPLAYS; |
| 1647 | display_number++) { |
| 1648 | port = 6000 + display_number; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1649 | memset(&hints, 0, sizeof(hints)); |
| 1650 | hints.ai_family = IPv4or6; |
| 1651 | hints.ai_flags = AI_PASSIVE; /* XXX loopback only ? */ |
| 1652 | hints.ai_socktype = SOCK_STREAM; |
| 1653 | snprintf(strport, sizeof strport, "%d", port); |
| 1654 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { |
| 1655 | error("getaddrinfo: %.100s", gai_strerror(gaierr)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1656 | return NULL; |
| 1657 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1658 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 1659 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 1660 | continue; |
| 1661 | sock = socket(ai->ai_family, SOCK_STREAM, 0); |
| 1662 | if (sock < 0) { |
Damien Miller | e219273 | 2000-01-17 13:22:55 +1100 | [diff] [blame] | 1663 | if (errno != EINVAL) { |
| 1664 | error("socket: %.100s", strerror(errno)); |
| 1665 | return NULL; |
| 1666 | } else { |
| 1667 | debug("Socket family %d not supported [X11 disp create]", ai->ai_family); |
| 1668 | continue; |
| 1669 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1670 | } |
| 1671 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
| 1672 | debug("bind port %d: %.100s", port, strerror(errno)); |
| 1673 | shutdown(sock, SHUT_RDWR); |
| 1674 | close(sock); |
Damien Miller | 3c7eeb2 | 2000-03-03 22:35:33 +1100 | [diff] [blame] | 1675 | |
| 1676 | if (ai->ai_next) |
| 1677 | continue; |
| 1678 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1679 | for (n = 0; n < num_socks; n++) { |
| 1680 | shutdown(socks[n], SHUT_RDWR); |
| 1681 | close(socks[n]); |
| 1682 | } |
| 1683 | num_socks = 0; |
| 1684 | break; |
| 1685 | } |
| 1686 | socks[num_socks++] = sock; |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 1687 | #ifndef DONT_TRY_OTHER_AF |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1688 | if (num_socks == NUM_SOCKS) |
| 1689 | break; |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 1690 | #else |
| 1691 | break; |
| 1692 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1693 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1694 | if (num_socks > 0) |
| 1695 | break; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1696 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1697 | if (display_number >= MAX_DISPLAYS) { |
| 1698 | error("Failed to allocate internet-domain X11 display socket."); |
| 1699 | return NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1700 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1701 | /* Start listening for connections on the socket. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1702 | for (n = 0; n < num_socks; n++) { |
| 1703 | sock = socks[n]; |
| 1704 | if (listen(sock, 5) < 0) { |
| 1705 | error("listen: %.100s", strerror(errno)); |
| 1706 | shutdown(sock, SHUT_RDWR); |
| 1707 | close(sock); |
| 1708 | return NULL; |
| 1709 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1710 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1711 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1712 | /* Set up a suitable value for the DISPLAY variable. */ |
Damien Miller | 76112de | 1999-12-21 11:18:08 +1100 | [diff] [blame] | 1713 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1714 | if (gethostname(hostname, sizeof(hostname)) < 0) |
| 1715 | fatal("gethostname: %.100s", strerror(errno)); |
Damien Miller | 76112de | 1999-12-21 11:18:08 +1100 | [diff] [blame] | 1716 | |
| 1717 | #ifdef IPADDR_IN_DISPLAY |
| 1718 | /* |
| 1719 | * HPUX detects the local hostname in the DISPLAY variable and tries |
| 1720 | * to set up a shared memory connection to the server, which it |
| 1721 | * incorrectly supposes to be local. |
| 1722 | * |
| 1723 | * The workaround - as used in later $$H and other programs - is |
| 1724 | * is to set display to the host's IP address. |
| 1725 | */ |
| 1726 | { |
| 1727 | struct hostent *he; |
| 1728 | struct in_addr my_addr; |
| 1729 | |
| 1730 | he = gethostbyname(hostname); |
| 1731 | if (he == NULL) { |
| 1732 | error("[X11-broken-fwd-hostname-workaround] Could not get " |
| 1733 | "IP address for hostname %s.", hostname); |
| 1734 | |
| 1735 | packet_send_debug("[X11-broken-fwd-hostname-workaround]" |
| 1736 | "Could not get IP address for hostname %s.", hostname); |
| 1737 | |
| 1738 | shutdown(sock, SHUT_RDWR); |
| 1739 | close(sock); |
| 1740 | |
| 1741 | return NULL; |
| 1742 | } |
| 1743 | |
| 1744 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); |
| 1745 | |
| 1746 | /* Set DISPLAY to <ip address>:screen.display */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1747 | snprintf(display, sizeof(display), "%.50s:%d.%d", inet_ntoa(my_addr), |
Damien Miller | 76112de | 1999-12-21 11:18:08 +1100 | [diff] [blame] | 1748 | display_number, screen_number); |
| 1749 | } |
| 1750 | #else /* IPADDR_IN_DISPLAY */ |
| 1751 | /* Just set DISPLAY to hostname:screen.display */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1752 | snprintf(display, sizeof display, "%.400s:%d.%d", hostname, |
Damien Miller | 76112de | 1999-12-21 11:18:08 +1100 | [diff] [blame] | 1753 | display_number, screen_number); |
| 1754 | #endif /* IPADDR_IN_DISPLAY */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1755 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1756 | /* Allocate a channel for each socket. */ |
| 1757 | for (n = 0; n < num_socks; n++) { |
| 1758 | sock = socks[n]; |
| 1759 | (void) channel_allocate(SSH_CHANNEL_X11_LISTENER, sock, |
| 1760 | xstrdup("X11 inet listener")); |
| 1761 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1762 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1763 | /* Return a suitable value for the DISPLAY environment variable. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1764 | return xstrdup(display); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1765 | } |
| 1766 | |
| 1767 | #ifndef X_UNIX_PATH |
| 1768 | #define X_UNIX_PATH "/tmp/.X11-unix/X" |
| 1769 | #endif |
| 1770 | |
| 1771 | static |
| 1772 | int |
Damien Miller | 81b25cf | 1999-12-07 16:47:28 +1100 | [diff] [blame] | 1773 | connect_local_xsocket(unsigned int dnr) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1774 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1775 | static const char *const x_sockets[] = { |
| 1776 | X_UNIX_PATH "%u", |
| 1777 | "/var/X/.X11-unix/X" "%u", |
| 1778 | "/usr/spool/sockets/X11/" "%u", |
| 1779 | NULL |
| 1780 | }; |
| 1781 | int sock; |
| 1782 | struct sockaddr_un addr; |
| 1783 | const char *const * path; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1784 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1785 | for (path = x_sockets; *path; ++path) { |
| 1786 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
| 1787 | if (sock < 0) |
| 1788 | error("socket: %.100s", strerror(errno)); |
| 1789 | memset(&addr, 0, sizeof(addr)); |
| 1790 | addr.sun_family = AF_UNIX; |
| 1791 | snprintf(addr.sun_path, sizeof addr.sun_path, *path, dnr); |
| 1792 | if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0) |
| 1793 | return sock; |
| 1794 | close(sock); |
| 1795 | } |
| 1796 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
| 1797 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1798 | } |
| 1799 | |
| 1800 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1801 | /* |
| 1802 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains |
| 1803 | * the remote channel number. We should do whatever we want, and respond |
| 1804 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. |
| 1805 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1806 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1807 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1808 | x11_input_open(int type, int plen) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1809 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1810 | int remote_channel, display_number, sock = 0, newch; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1811 | const char *display; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1812 | char buf[1024], *cp, *remote_host; |
Damien Miller | 7684ee1 | 2000-03-17 23:40:15 +1100 | [diff] [blame] | 1813 | unsigned int remote_len; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1814 | struct addrinfo hints, *ai, *aitop; |
| 1815 | char strport[NI_MAXSERV]; |
| 1816 | int gaierr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1817 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1818 | /* Get remote channel number. */ |
| 1819 | remote_channel = packet_get_int(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1820 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1821 | /* Get remote originator name. */ |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1822 | if (have_hostname_in_open) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1823 | remote_host = packet_get_string(&remote_len); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1824 | remote_len += 4; |
| 1825 | } else { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1826 | remote_host = xstrdup("unknown (remote did not supply name)"); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1827 | remote_len = 0; |
| 1828 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1829 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1830 | debug("Received X11 open request."); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1831 | packet_integrity_check(plen, 4 + remote_len, SSH_SMSG_X11_OPEN); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1832 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1833 | /* Try to open a socket for the local X server. */ |
| 1834 | display = getenv("DISPLAY"); |
| 1835 | if (!display) { |
| 1836 | error("DISPLAY not set."); |
| 1837 | goto fail; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1838 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1839 | /* |
| 1840 | * Now we decode the value of the DISPLAY variable and make a |
| 1841 | * connection to the real X server. |
| 1842 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1843 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1844 | /* |
| 1845 | * Check if it is a unix domain socket. Unix domain displays are in |
| 1846 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] |
| 1847 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1848 | if (strncmp(display, "unix:", 5) == 0 || |
| 1849 | display[0] == ':') { |
| 1850 | /* Connect to the unix domain socket. */ |
| 1851 | if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) { |
| 1852 | error("Could not parse display number from DISPLAY: %.100s", |
| 1853 | display); |
| 1854 | goto fail; |
| 1855 | } |
| 1856 | /* Create a socket. */ |
| 1857 | sock = connect_local_xsocket(display_number); |
| 1858 | if (sock < 0) |
| 1859 | goto fail; |
| 1860 | |
| 1861 | /* OK, we now have a connection to the display. */ |
| 1862 | goto success; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1863 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1864 | /* |
| 1865 | * Connect to an inet socket. The DISPLAY value is supposedly |
| 1866 | * hostname:d[.s], where hostname may also be numeric IP address. |
| 1867 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1868 | strncpy(buf, display, sizeof(buf)); |
| 1869 | buf[sizeof(buf) - 1] = 0; |
| 1870 | cp = strchr(buf, ':'); |
| 1871 | if (!cp) { |
| 1872 | error("Could not find ':' in DISPLAY: %.100s", display); |
| 1873 | goto fail; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1874 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1875 | *cp = 0; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1876 | /* 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] | 1877 | if (sscanf(cp + 1, "%d", &display_number) != 1) { |
| 1878 | error("Could not parse display number from DISPLAY: %.100s", |
| 1879 | display); |
| 1880 | goto fail; |
| 1881 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1882 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1883 | /* Look up the host address */ |
| 1884 | memset(&hints, 0, sizeof(hints)); |
| 1885 | hints.ai_family = IPv4or6; |
| 1886 | hints.ai_socktype = SOCK_STREAM; |
| 1887 | snprintf(strport, sizeof strport, "%d", 6000 + display_number); |
| 1888 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
| 1889 | error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1890 | goto fail; |
| 1891 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1892 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 1893 | /* Create a socket. */ |
| 1894 | sock = socket(ai->ai_family, SOCK_STREAM, 0); |
| 1895 | if (sock < 0) { |
| 1896 | debug("socket: %.100s", strerror(errno)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1897 | continue; |
| 1898 | } |
| 1899 | /* Connect it to the display. */ |
| 1900 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
| 1901 | debug("connect %.100s port %d: %.100s", buf, |
| 1902 | 6000 + display_number, strerror(errno)); |
| 1903 | close(sock); |
| 1904 | continue; |
| 1905 | } |
| 1906 | /* Success */ |
| 1907 | break; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1908 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1909 | freeaddrinfo(aitop); |
| 1910 | if (!ai) { |
| 1911 | error("connect %.100s port %d: %.100s", buf, 6000 + display_number, |
| 1912 | strerror(errno)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1913 | goto fail; |
| 1914 | } |
| 1915 | success: |
| 1916 | /* We have successfully obtained a connection to the real X display. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1917 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1918 | /* Allocate a channel for this connection. */ |
| 1919 | if (x11_saved_proto == NULL) |
| 1920 | newch = channel_allocate(SSH_CHANNEL_OPEN, sock, remote_host); |
| 1921 | else |
| 1922 | newch = channel_allocate(SSH_CHANNEL_X11_OPEN, sock, remote_host); |
| 1923 | channels[newch].remote_id = remote_channel; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1924 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1925 | /* Send a confirmation to the remote host. */ |
| 1926 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1927 | packet_put_int(remote_channel); |
| 1928 | packet_put_int(newch); |
| 1929 | packet_send(); |
| 1930 | |
| 1931 | return; |
| 1932 | |
| 1933 | fail: |
| 1934 | /* Send refusal to the remote host. */ |
| 1935 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 1936 | packet_put_int(remote_channel); |
| 1937 | packet_send(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1938 | } |
| 1939 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1940 | /* |
| 1941 | * Requests forwarding of X11 connections, generates fake authentication |
| 1942 | * data, and enables authentication spoofing. |
| 1943 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1944 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1945 | void |
| 1946 | x11_request_forwarding_with_spoofing(const char *proto, const char *data) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1947 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1948 | unsigned int data_len = (unsigned int) strlen(data) / 2; |
| 1949 | unsigned int i, value; |
| 1950 | char *new_data; |
| 1951 | int screen_number; |
| 1952 | const char *cp; |
| 1953 | u_int32_t rand = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1954 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1955 | cp = getenv("DISPLAY"); |
| 1956 | if (cp) |
| 1957 | cp = strchr(cp, ':'); |
| 1958 | if (cp) |
| 1959 | cp = strchr(cp, '.'); |
| 1960 | if (cp) |
| 1961 | screen_number = atoi(cp + 1); |
| 1962 | else |
| 1963 | screen_number = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1964 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1965 | /* Save protocol name. */ |
| 1966 | x11_saved_proto = xstrdup(proto); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1967 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1968 | /* |
| 1969 | * Extract real authentication data and generate fake data of the |
| 1970 | * same length. |
| 1971 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1972 | x11_saved_data = xmalloc(data_len); |
| 1973 | x11_fake_data = xmalloc(data_len); |
| 1974 | for (i = 0; i < data_len; i++) { |
| 1975 | if (sscanf(data + 2 * i, "%2x", &value) != 1) |
| 1976 | fatal("x11_request_forwarding: bad authentication data: %.100s", data); |
| 1977 | if (i % 4 == 0) |
| 1978 | rand = arc4random(); |
| 1979 | x11_saved_data[i] = value; |
| 1980 | x11_fake_data[i] = rand & 0xff; |
| 1981 | rand >>= 8; |
| 1982 | } |
| 1983 | x11_saved_data_len = data_len; |
| 1984 | x11_fake_data_len = data_len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1985 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1986 | /* Convert the fake data into hex. */ |
| 1987 | new_data = xmalloc(2 * data_len + 1); |
| 1988 | for (i = 0; i < data_len; i++) |
| 1989 | sprintf(new_data + 2 * i, "%02x", (unsigned char) x11_fake_data[i]); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1990 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1991 | /* Send the request packet. */ |
| 1992 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); |
| 1993 | packet_put_string(proto, strlen(proto)); |
| 1994 | packet_put_string(new_data, strlen(new_data)); |
| 1995 | packet_put_int(screen_number); |
| 1996 | packet_send(); |
| 1997 | packet_write_wait(); |
| 1998 | xfree(new_data); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1999 | } |
| 2000 | |
| 2001 | /* Sends a message to the server to request authentication fd forwarding. */ |
| 2002 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2003 | void |
| 2004 | auth_request_forwarding() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2005 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2006 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
| 2007 | packet_send(); |
| 2008 | packet_write_wait(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2009 | } |
| 2010 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2011 | /* |
| 2012 | * Returns the name of the forwarded authentication socket. Returns NULL if |
| 2013 | * there is no forwarded authentication socket. The returned value points to |
| 2014 | * a static buffer. |
| 2015 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2016 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2017 | char * |
| 2018 | auth_get_socket_name() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2019 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2020 | return channel_forwarded_auth_socket_name; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2021 | } |
| 2022 | |
| 2023 | /* removes the agent forwarding socket */ |
| 2024 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2025 | void |
| 2026 | cleanup_socket(void) |
| 2027 | { |
| 2028 | remove(channel_forwarded_auth_socket_name); |
| 2029 | rmdir(channel_forwarded_auth_socket_dir); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2030 | } |
| 2031 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2032 | /* |
| 2033 | * This if called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server. |
| 2034 | * This starts forwarding authentication requests. |
| 2035 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2036 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2037 | void |
| 2038 | auth_input_request_forwarding(struct passwd * pw) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2039 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2040 | int sock, newch; |
| 2041 | struct sockaddr_un sunaddr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2042 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2043 | if (auth_get_socket_name() != NULL) |
| 2044 | fatal("Protocol error: authentication forwarding requested twice."); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2045 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2046 | /* Temporarily drop privileged uid for mkdir/bind. */ |
| 2047 | temporarily_use_uid(pw->pw_uid); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2048 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2049 | /* Allocate a buffer for the socket name, and format the name. */ |
| 2050 | channel_forwarded_auth_socket_name = xmalloc(MAX_SOCKET_NAME); |
| 2051 | channel_forwarded_auth_socket_dir = xmalloc(MAX_SOCKET_NAME); |
| 2052 | strlcpy(channel_forwarded_auth_socket_dir, "/tmp/ssh-XXXXXXXX", MAX_SOCKET_NAME); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2053 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2054 | /* Create private directory for socket */ |
| 2055 | if (mkdtemp(channel_forwarded_auth_socket_dir) == NULL) |
| 2056 | packet_disconnect("mkdtemp: %.100s", strerror(errno)); |
| 2057 | snprintf(channel_forwarded_auth_socket_name, MAX_SOCKET_NAME, "%s/agent.%d", |
| 2058 | channel_forwarded_auth_socket_dir, (int) getpid()); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2059 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2060 | if (atexit(cleanup_socket) < 0) { |
| 2061 | int saved = errno; |
| 2062 | cleanup_socket(); |
| 2063 | packet_disconnect("socket: %.100s", strerror(saved)); |
| 2064 | } |
| 2065 | /* Create the socket. */ |
| 2066 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
| 2067 | if (sock < 0) |
| 2068 | packet_disconnect("socket: %.100s", strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2069 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2070 | /* Bind it to the name. */ |
| 2071 | memset(&sunaddr, 0, sizeof(sunaddr)); |
| 2072 | sunaddr.sun_family = AF_UNIX; |
| 2073 | strncpy(sunaddr.sun_path, channel_forwarded_auth_socket_name, |
| 2074 | sizeof(sunaddr.sun_path)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2075 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2076 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) |
| 2077 | packet_disconnect("bind: %.100s", strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2078 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2079 | /* Restore the privileged uid. */ |
| 2080 | restore_uid(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2081 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2082 | /* Start listening on the socket. */ |
| 2083 | if (listen(sock, 5) < 0) |
| 2084 | packet_disconnect("listen: %.100s", strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2085 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2086 | /* Allocate a channel for the authentication agent socket. */ |
| 2087 | newch = channel_allocate(SSH_CHANNEL_AUTH_SOCKET, sock, |
| 2088 | xstrdup("auth socket")); |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 2089 | strlcpy(channels[newch].path, channel_forwarded_auth_socket_name, |
| 2090 | sizeof(channels[newch].path)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2091 | } |
| 2092 | |
| 2093 | /* This is called to process an SSH_SMSG_AGENT_OPEN message. */ |
| 2094 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2095 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2096 | auth_input_open_request(int type, int plen) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2097 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2098 | int remch, sock, newch; |
| 2099 | char *dummyname; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2100 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2101 | packet_integrity_check(plen, 4, type); |
| 2102 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2103 | /* Read the remote channel number from the message. */ |
| 2104 | remch = packet_get_int(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2105 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2106 | /* |
| 2107 | * Get a connection to the local authentication agent (this may again |
| 2108 | * get forwarded). |
| 2109 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2110 | sock = ssh_get_authentication_socket(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2111 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2112 | /* |
| 2113 | * If we could not connect the agent, send an error message back to |
| 2114 | * the server. This should never happen unless the agent dies, |
| 2115 | * because authentication forwarding is only enabled if we have an |
| 2116 | * agent. |
| 2117 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2118 | if (sock < 0) { |
| 2119 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 2120 | packet_put_int(remch); |
| 2121 | packet_send(); |
| 2122 | return; |
| 2123 | } |
| 2124 | debug("Forwarding authentication connection."); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2125 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 2126 | /* |
| 2127 | * Dummy host name. This will be freed when the channel is freed; it |
| 2128 | * will still be valid in the packet_put_string below since the |
| 2129 | * channel cannot yet be freed at that point. |
| 2130 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2131 | dummyname = xstrdup("authentication agent connection"); |
| 2132 | |
| 2133 | newch = channel_allocate(SSH_CHANNEL_OPEN, sock, dummyname); |
| 2134 | channels[newch].remote_id = remch; |
| 2135 | |
| 2136 | /* Send a confirmation to the remote host. */ |
| 2137 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 2138 | packet_put_int(remch); |
| 2139 | packet_put_int(newch); |
| 2140 | packet_send(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2141 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 2142 | |
| 2143 | void |
| 2144 | channel_open(int id) |
| 2145 | { |
| 2146 | Channel *c = channel_lookup(id); |
| 2147 | if (c == NULL) { |
| 2148 | log("channel_open: %d: bad id", id); |
| 2149 | return; |
| 2150 | } |
| 2151 | packet_start(SSH2_MSG_CHANNEL_OPEN); |
| 2152 | packet_put_cstring(c->ctype); |
| 2153 | packet_put_int(c->self); |
| 2154 | packet_put_int(c->local_window); |
| 2155 | packet_put_int(c->local_maxpacket); |
| 2156 | packet_send(); |
| 2157 | debug("channel open %d", id); |
| 2158 | } |
| 2159 | void |
| 2160 | channel_request(int id, char *service, int wantconfirm) |
| 2161 | { |
| 2162 | channel_request_start(id, service, wantconfirm); |
| 2163 | packet_send(); |
| 2164 | debug("channel request %d: %s", id, service) ; |
| 2165 | } |
| 2166 | void |
| 2167 | channel_request_start(int id, char *service, int wantconfirm) |
| 2168 | { |
| 2169 | Channel *c = channel_lookup(id); |
| 2170 | if (c == NULL) { |
| 2171 | log("channel_request: %d: bad id", id); |
| 2172 | return; |
| 2173 | } |
| 2174 | packet_start(SSH2_MSG_CHANNEL_REQUEST); |
| 2175 | packet_put_int(c->remote_id); |
| 2176 | packet_put_cstring(service); |
| 2177 | packet_put_char(wantconfirm); |
| 2178 | } |
| 2179 | void |
| 2180 | channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg) |
| 2181 | { |
| 2182 | Channel *c = channel_lookup(id); |
| 2183 | if (c == NULL) { |
| 2184 | log("channel_register_callback: %d: bad id", id); |
| 2185 | return; |
| 2186 | } |
| 2187 | c->cb_event = mtype; |
| 2188 | c->cb_fn = fn; |
| 2189 | c->cb_arg = arg; |
| 2190 | } |
| 2191 | void |
| 2192 | channel_register_cleanup(int id, channel_callback_fn *fn) |
| 2193 | { |
| 2194 | Channel *c = channel_lookup(id); |
| 2195 | if (c == NULL) { |
| 2196 | log("channel_register_cleanup: %d: bad id", id); |
| 2197 | return; |
| 2198 | } |
| 2199 | c->dettach_user = fn; |
| 2200 | } |
| 2201 | void |
| 2202 | channel_cancel_cleanup(int id) |
| 2203 | { |
| 2204 | Channel *c = channel_lookup(id); |
| 2205 | if (c == NULL) { |
| 2206 | log("channel_cancel_cleanup: %d: bad id", id); |
| 2207 | return; |
| 2208 | } |
| 2209 | c->dettach_user = NULL; |
| 2210 | } |
| 2211 | |
| 2212 | void |
| 2213 | channel_set_fds(int id, int rfd, int wfd, int efd, int extusage) |
| 2214 | { |
| 2215 | Channel *c = channel_lookup(id); |
| 2216 | if (c == NULL || c->type != SSH_CHANNEL_LARVAL) |
| 2217 | fatal("channel_activate for non-larval channel %d.", id); |
| 2218 | if (rfd > channel_max_fd_value) |
| 2219 | channel_max_fd_value = rfd; |
| 2220 | if (wfd > channel_max_fd_value) |
| 2221 | channel_max_fd_value = wfd; |
| 2222 | if (efd > channel_max_fd_value) |
| 2223 | channel_max_fd_value = efd; |
| 2224 | c->type = SSH_CHANNEL_OPEN; |
| 2225 | c->rfd = rfd; |
| 2226 | c->wfd = wfd; |
| 2227 | c->efd = efd; |
| 2228 | c->extended_usage = extusage; |
| 2229 | /* XXX window size? */ |
| 2230 | c->local_window = c->local_window_max = c->local_maxpacket/2; |
| 2231 | packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST); |
| 2232 | packet_put_int(c->remote_id); |
| 2233 | packet_put_int(c->local_window); |
| 2234 | packet_send(); |
| 2235 | } |