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 | * |
| 16 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 17 | |
| 18 | #include "includes.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 19 | RCSID("$Id: channels.c,v 1.20 2000/04/01 01:09:23 damien Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 20 | |
| 21 | #include "ssh.h" |
| 22 | #include "packet.h" |
| 23 | #include "xmalloc.h" |
| 24 | #include "buffer.h" |
| 25 | #include "authfd.h" |
| 26 | #include "uidswap.h" |
Damien Miller | 6d7b2cd | 1999-11-12 15:19:27 +1100 | [diff] [blame] | 27 | #include "readconf.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 28 | #include "servconf.h" |
| 29 | |
| 30 | #include "channels.h" |
| 31 | #include "nchan.h" |
| 32 | #include "compat.h" |
| 33 | |
| 34 | /* Maximum number of fake X11 displays to try. */ |
| 35 | #define MAX_DISPLAYS 1000 |
| 36 | |
| 37 | /* Max len of agent socket */ |
| 38 | #define MAX_SOCKET_NAME 100 |
| 39 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 40 | /* default buffer for tcp-fwd-channel */ |
| 41 | #define CHAN_WINDOW_DEFAULT (8*1024) |
| 42 | #define CHAN_PACKET_DEFAULT (CHAN_WINDOW_DEFAULT/2) |
| 43 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 44 | /* |
| 45 | * Pointer to an array containing all allocated channels. The array is |
| 46 | * dynamically extended as needed. |
| 47 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 48 | static Channel *channels = NULL; |
| 49 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 50 | /* |
| 51 | * Size of the channel array. All slots of the array must always be |
| 52 | * initialized (at least the type field); unused slots are marked with type |
| 53 | * SSH_CHANNEL_FREE. |
| 54 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 55 | static int channels_alloc = 0; |
| 56 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 57 | /* |
| 58 | * Maximum file descriptor value used in any of the channels. This is |
| 59 | * updated in channel_allocate. |
| 60 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 61 | static int channel_max_fd_value = 0; |
| 62 | |
| 63 | /* Name and directory of socket for authentication agent forwarding. */ |
| 64 | static char *channel_forwarded_auth_socket_name = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 65 | static char *channel_forwarded_auth_socket_dir = NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 66 | |
| 67 | /* Saved X11 authentication protocol name. */ |
| 68 | char *x11_saved_proto = NULL; |
| 69 | |
| 70 | /* Saved X11 authentication data. This is the real data. */ |
| 71 | char *x11_saved_data = NULL; |
| 72 | unsigned int x11_saved_data_len = 0; |
| 73 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 74 | /* |
| 75 | * Fake X11 authentication data. This is what the server will be sending us; |
| 76 | * we should replace any occurrences of this by the real data. |
| 77 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 78 | char *x11_fake_data = NULL; |
| 79 | unsigned int x11_fake_data_len; |
| 80 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 81 | /* |
| 82 | * Data structure for storing which hosts are permitted for forward requests. |
| 83 | * The local sides of any remote forwards are stored in this array to prevent |
| 84 | * a corrupt remote server from accessing arbitrary TCP/IP ports on our local |
| 85 | * network (which might be behind a firewall). |
| 86 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 87 | typedef struct { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 88 | char *host_to_connect; /* Connect to 'host'. */ |
| 89 | u_short port_to_connect; /* Connect to 'port'. */ |
| 90 | u_short listen_port; /* Remote side should listen port number. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 91 | } ForwardPermission; |
| 92 | |
| 93 | /* List of all permitted host/port pairs to connect. */ |
| 94 | static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION]; |
| 95 | /* Number of permitted host/port pairs in the array. */ |
| 96 | static int num_permitted_opens = 0; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 97 | /* |
| 98 | * If this is true, all opens are permitted. This is the case on the server |
| 99 | * on which we have to trust the client anyway, and the user could do |
| 100 | * anything after logging in anyway. |
| 101 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 102 | static int all_opens_permitted = 0; |
| 103 | |
| 104 | /* This is set to true if both sides support SSH_PROTOFLAG_HOST_IN_FWD_OPEN. */ |
| 105 | static int have_hostname_in_open = 0; |
| 106 | |
| 107 | /* Sets specific protocol options. */ |
| 108 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 109 | void |
| 110 | channel_set_options(int hostname_in_open) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 111 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 112 | have_hostname_in_open = hostname_in_open; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 113 | } |
| 114 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 115 | /* |
| 116 | * Permits opening to any host/port in SSH_MSG_PORT_OPEN. This is usually |
| 117 | * called by the server, because the user could connect to any port anyway, |
| 118 | * and the server has no way to know but to trust the client anyway. |
| 119 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 120 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 121 | void |
| 122 | channel_permit_all_opens() |
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 | all_opens_permitted = 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 125 | } |
| 126 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 127 | /* lookup channel by id */ |
| 128 | |
| 129 | Channel * |
| 130 | channel_lookup(int id) |
| 131 | { |
| 132 | Channel *c; |
| 133 | if (id < 0 && id > channels_alloc) { |
| 134 | log("channel_lookup: %d: bad id", id); |
| 135 | return NULL; |
| 136 | } |
| 137 | c = &channels[id]; |
| 138 | if (c->type == SSH_CHANNEL_FREE) { |
| 139 | log("channel_lookup: %d: bad id: channel free", id); |
| 140 | return NULL; |
| 141 | } |
| 142 | return c; |
| 143 | } |
| 144 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 145 | /* |
| 146 | * Allocate a new channel object and set its type and socket. This will cause |
| 147 | * remote_name to be freed. |
| 148 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 149 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 150 | int |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 151 | channel_new(char *ctype, int type, int rfd, int wfd, int efd, |
| 152 | int window, int maxpack, int extended_usage, char *remote_name) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 153 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 154 | int i, found; |
| 155 | Channel *c; |
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 | /* Update the maximum file descriptor value. */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 158 | if (rfd > channel_max_fd_value) |
| 159 | channel_max_fd_value = rfd; |
| 160 | if (wfd > channel_max_fd_value) |
| 161 | channel_max_fd_value = wfd; |
| 162 | if (efd > channel_max_fd_value) |
| 163 | channel_max_fd_value = efd; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 164 | /* XXX set close-on-exec -markus */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 165 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 166 | /* Do initial allocation if this is the first call. */ |
| 167 | if (channels_alloc == 0) { |
| 168 | channels_alloc = 10; |
| 169 | channels = xmalloc(channels_alloc * sizeof(Channel)); |
| 170 | for (i = 0; i < channels_alloc; i++) |
| 171 | channels[i].type = SSH_CHANNEL_FREE; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 172 | /* |
| 173 | * Kludge: arrange a call to channel_stop_listening if we |
| 174 | * terminate with fatal(). |
| 175 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 176 | fatal_add_cleanup((void (*) (void *)) channel_stop_listening, NULL); |
| 177 | } |
| 178 | /* Try to find a free slot where to put the new channel. */ |
| 179 | for (found = -1, i = 0; i < channels_alloc; i++) |
| 180 | if (channels[i].type == SSH_CHANNEL_FREE) { |
| 181 | /* Found a free slot. */ |
| 182 | found = i; |
| 183 | break; |
| 184 | } |
| 185 | if (found == -1) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 186 | /* 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] | 187 | found = channels_alloc; |
| 188 | channels_alloc += 10; |
| 189 | debug("channel: expanding %d", channels_alloc); |
| 190 | channels = xrealloc(channels, channels_alloc * sizeof(Channel)); |
| 191 | for (i = found; i < channels_alloc; i++) |
| 192 | channels[i].type = SSH_CHANNEL_FREE; |
| 193 | } |
| 194 | /* Initialize and return new channel number. */ |
| 195 | c = &channels[found]; |
| 196 | buffer_init(&c->input); |
| 197 | buffer_init(&c->output); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 198 | buffer_init(&c->extended); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 199 | chan_init_iostates(c); |
| 200 | c->self = found; |
| 201 | c->type = type; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 202 | c->ctype = ctype; |
| 203 | c->local_window = window; |
| 204 | c->local_window_max = window; |
| 205 | c->local_consumed = 0; |
| 206 | c->local_maxpacket = maxpack; |
| 207 | c->remote_window = 0; |
| 208 | c->remote_maxpacket = 0; |
| 209 | c->rfd = rfd; |
| 210 | c->wfd = wfd; |
| 211 | c->sock = (rfd == wfd) ? rfd : -1; |
| 212 | c->efd = efd; |
| 213 | c->extended_usage = extended_usage; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 214 | c->remote_id = -1; |
| 215 | c->remote_name = remote_name; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 216 | c->remote_window = 0; |
| 217 | c->remote_maxpacket = 0; |
| 218 | c->cb_fn = NULL; |
| 219 | c->cb_arg = NULL; |
| 220 | c->cb_event = 0; |
| 221 | c->dettach_user = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 222 | debug("channel %d: new [%s]", found, remote_name); |
| 223 | return found; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 224 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 225 | int |
| 226 | channel_allocate(int type, int sock, char *remote_name) |
| 227 | { |
| 228 | return channel_new("", type, sock, sock, -1, 0, 0, 0, remote_name); |
| 229 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 230 | |
| 231 | /* Free the channel and close its socket. */ |
| 232 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 233 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 234 | channel_free(int id) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 235 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 236 | Channel *c = channel_lookup(id); |
| 237 | if (c == NULL) |
| 238 | packet_disconnect("channel free: bad local channel %d", id); |
| 239 | debug("channel_free: channel %d: status: %s", id, channel_open_message()); |
| 240 | if (c->sock != -1) { |
| 241 | shutdown(c->sock, SHUT_RDWR); |
| 242 | close(c->sock); |
| 243 | } |
| 244 | buffer_free(&c->input); |
| 245 | buffer_free(&c->output); |
| 246 | buffer_free(&c->extended); |
| 247 | c->type = SSH_CHANNEL_FREE; |
| 248 | if (c->remote_name) { |
| 249 | xfree(c->remote_name); |
| 250 | c->remote_name = NULL; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 251 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 252 | } |
| 253 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 254 | /* |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 255 | * 'channel_pre*' are called just before select() to add any bits relevant to |
| 256 | * channels in the select bitmasks. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 257 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 258 | /* |
| 259 | * 'channel_post*': perform any appropriate operations for channels which |
| 260 | * have events pending. |
| 261 | */ |
| 262 | typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset); |
| 263 | chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE]; |
| 264 | chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE]; |
| 265 | |
| 266 | void |
| 267 | channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 268 | { |
| 269 | FD_SET(c->sock, readset); |
| 270 | } |
| 271 | |
| 272 | void |
| 273 | channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset) |
| 274 | { |
| 275 | if (buffer_len(&c->input) < packet_get_maxsize()) |
| 276 | FD_SET(c->sock, readset); |
| 277 | if (buffer_len(&c->output) > 0) |
| 278 | FD_SET(c->sock, writeset); |
| 279 | } |
| 280 | |
| 281 | void |
| 282 | channel_pre_open_15(Channel *c, fd_set * readset, fd_set * writeset) |
| 283 | { |
| 284 | /* test whether sockets are 'alive' for read/write */ |
| 285 | if (c->istate == CHAN_INPUT_OPEN) |
| 286 | if (buffer_len(&c->input) < packet_get_maxsize()) |
| 287 | FD_SET(c->sock, readset); |
| 288 | if (c->ostate == CHAN_OUTPUT_OPEN || |
| 289 | c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { |
| 290 | if (buffer_len(&c->output) > 0) { |
| 291 | FD_SET(c->sock, writeset); |
| 292 | } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) { |
| 293 | chan_obuf_empty(c); |
| 294 | } |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | void |
| 299 | channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset) |
| 300 | { |
| 301 | if (buffer_len(&c->input) == 0) { |
| 302 | packet_start(SSH_MSG_CHANNEL_CLOSE); |
| 303 | packet_put_int(c->remote_id); |
| 304 | packet_send(); |
| 305 | c->type = SSH_CHANNEL_CLOSED; |
| 306 | debug("Closing channel %d after input drain.", c->self); |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | void |
| 311 | channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset) |
| 312 | { |
| 313 | if (buffer_len(&c->output) == 0) |
| 314 | channel_free(c->self); |
| 315 | else |
| 316 | FD_SET(c->sock, writeset); |
| 317 | } |
| 318 | |
| 319 | /* |
| 320 | * This is a special state for X11 authentication spoofing. An opened X11 |
| 321 | * connection (when authentication spoofing is being done) remains in this |
| 322 | * state until the first packet has been completely read. The authentication |
| 323 | * data in that packet is then substituted by the real data if it matches the |
| 324 | * fake data, and the channel is put into normal mode. |
| 325 | */ |
| 326 | int |
| 327 | x11_open_helper(Channel *c) |
| 328 | { |
| 329 | unsigned char *ucp; |
| 330 | unsigned int proto_len, data_len; |
| 331 | |
| 332 | /* Check if the fixed size part of the packet is in buffer. */ |
| 333 | if (buffer_len(&c->output) < 12) |
| 334 | return 0; |
| 335 | |
| 336 | /* Parse the lengths of variable-length fields. */ |
| 337 | ucp = (unsigned char *) buffer_ptr(&c->output); |
| 338 | if (ucp[0] == 0x42) { /* Byte order MSB first. */ |
| 339 | proto_len = 256 * ucp[6] + ucp[7]; |
| 340 | data_len = 256 * ucp[8] + ucp[9]; |
| 341 | } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */ |
| 342 | proto_len = ucp[6] + 256 * ucp[7]; |
| 343 | data_len = ucp[8] + 256 * ucp[9]; |
| 344 | } else { |
| 345 | debug("Initial X11 packet contains bad byte order byte: 0x%x", |
| 346 | ucp[0]); |
| 347 | return -1; |
| 348 | } |
| 349 | |
| 350 | /* Check if the whole packet is in buffer. */ |
| 351 | if (buffer_len(&c->output) < |
| 352 | 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3)) |
| 353 | return 0; |
| 354 | |
| 355 | /* Check if authentication protocol matches. */ |
| 356 | if (proto_len != strlen(x11_saved_proto) || |
| 357 | memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) { |
| 358 | debug("X11 connection uses different authentication protocol."); |
| 359 | return -1; |
| 360 | } |
| 361 | /* Check if authentication data matches our fake data. */ |
| 362 | if (data_len != x11_fake_data_len || |
| 363 | memcmp(ucp + 12 + ((proto_len + 3) & ~3), |
| 364 | x11_fake_data, x11_fake_data_len) != 0) { |
| 365 | debug("X11 auth data does not match fake data."); |
| 366 | return -1; |
| 367 | } |
| 368 | /* Check fake data length */ |
| 369 | if (x11_fake_data_len != x11_saved_data_len) { |
| 370 | error("X11 fake_data_len %d != saved_data_len %d", |
| 371 | x11_fake_data_len, x11_saved_data_len); |
| 372 | return -1; |
| 373 | } |
| 374 | /* |
| 375 | * Received authentication protocol and data match |
| 376 | * our fake data. Substitute the fake data with real |
| 377 | * data. |
| 378 | */ |
| 379 | memcpy(ucp + 12 + ((proto_len + 3) & ~3), |
| 380 | x11_saved_data, x11_saved_data_len); |
| 381 | return 1; |
| 382 | } |
| 383 | |
| 384 | void |
| 385 | channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset) |
| 386 | { |
| 387 | int ret = x11_open_helper(c); |
| 388 | if (ret == 1) { |
| 389 | /* Start normal processing for the channel. */ |
| 390 | c->type = SSH_CHANNEL_OPEN; |
| 391 | } else if (ret == -1) { |
| 392 | /* |
| 393 | * We have received an X11 connection that has bad |
| 394 | * authentication information. |
| 395 | */ |
| 396 | log("X11 connection rejected because of wrong authentication.\r\n"); |
| 397 | buffer_clear(&c->input); |
| 398 | buffer_clear(&c->output); |
| 399 | close(c->sock); |
| 400 | c->sock = -1; |
| 401 | c->type = SSH_CHANNEL_CLOSED; |
| 402 | packet_start(SSH_MSG_CHANNEL_CLOSE); |
| 403 | packet_put_int(c->remote_id); |
| 404 | packet_send(); |
| 405 | } |
| 406 | } |
| 407 | |
| 408 | void |
| 409 | channel_pre_x11_open_15(Channel *c, fd_set * readset, fd_set * writeset) |
| 410 | { |
| 411 | int ret = x11_open_helper(c); |
| 412 | if (ret == 1) { |
| 413 | c->type = SSH_CHANNEL_OPEN; |
| 414 | } else if (ret == -1) { |
| 415 | debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate); |
| 416 | chan_read_failed(c); |
| 417 | chan_write_failed(c); |
| 418 | debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate); |
| 419 | } |
| 420 | } |
| 421 | |
| 422 | /* This is our fake X11 server socket. */ |
| 423 | void |
| 424 | channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 425 | { |
| 426 | struct sockaddr addr; |
| 427 | int newsock, newch; |
| 428 | socklen_t addrlen; |
| 429 | char buf[16384], *remote_hostname; |
| 430 | |
| 431 | if (FD_ISSET(c->sock, readset)) { |
| 432 | debug("X11 connection requested."); |
| 433 | addrlen = sizeof(addr); |
| 434 | newsock = accept(c->sock, &addr, &addrlen); |
| 435 | if (newsock < 0) { |
| 436 | error("accept: %.100s", strerror(errno)); |
| 437 | return; |
| 438 | } |
| 439 | remote_hostname = get_remote_hostname(newsock); |
| 440 | snprintf(buf, sizeof buf, "X11 connection from %.200s port %d", |
| 441 | remote_hostname, get_peer_port(newsock)); |
| 442 | xfree(remote_hostname); |
| 443 | newch = channel_allocate(SSH_CHANNEL_OPENING, newsock, |
| 444 | xstrdup(buf)); |
| 445 | packet_start(SSH_SMSG_X11_OPEN); |
| 446 | packet_put_int(newch); |
| 447 | if (have_hostname_in_open) |
| 448 | packet_put_string(buf, strlen(buf)); |
| 449 | packet_send(); |
| 450 | } |
| 451 | } |
| 452 | |
| 453 | /* |
| 454 | * This socket is listening for connections to a forwarded TCP/IP port. |
| 455 | */ |
| 456 | void |
| 457 | channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 458 | { |
| 459 | struct sockaddr addr; |
| 460 | int newsock, newch; |
| 461 | socklen_t addrlen; |
| 462 | char buf[1024], *remote_hostname; |
| 463 | int remote_port; |
| 464 | |
| 465 | if (FD_ISSET(c->sock, readset)) { |
| 466 | debug("Connection to port %d forwarding " |
| 467 | "to %.100s port %d requested.", |
| 468 | c->listening_port, c->path, c->host_port); |
| 469 | addrlen = sizeof(addr); |
| 470 | newsock = accept(c->sock, &addr, &addrlen); |
| 471 | if (newsock < 0) { |
| 472 | error("accept: %.100s", strerror(errno)); |
| 473 | return; |
| 474 | } |
| 475 | remote_hostname = get_remote_hostname(newsock); |
| 476 | remote_port = get_peer_port(newsock); |
| 477 | snprintf(buf, sizeof buf, |
| 478 | "listen port %d for %.100s port %d, " |
| 479 | "connect from %.200s port %d", |
| 480 | c->listening_port, c->path, c->host_port, |
| 481 | remote_hostname, remote_port); |
| 482 | newch = channel_new("direct-tcpip", |
| 483 | SSH_CHANNEL_OPENING, newsock, newsock, -1, |
| 484 | c->local_window_max, c->local_maxpacket, |
| 485 | 0, xstrdup(buf)); |
| 486 | |
| 487 | packet_start(SSH_MSG_PORT_OPEN); |
| 488 | packet_put_int(newch); |
| 489 | packet_put_string(c->path, strlen(c->path)); |
| 490 | packet_put_int(c->host_port); |
| 491 | if (have_hostname_in_open) { |
| 492 | packet_put_string(buf, strlen(buf)); |
| 493 | } |
| 494 | packet_send(); |
| 495 | xfree(remote_hostname); |
| 496 | } |
| 497 | } |
| 498 | |
| 499 | /* |
| 500 | * This is the authentication agent socket listening for connections from |
| 501 | * clients. |
| 502 | */ |
| 503 | void |
| 504 | channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset) |
| 505 | { |
| 506 | struct sockaddr addr; |
| 507 | int newsock, newch; |
| 508 | socklen_t addrlen; |
| 509 | |
| 510 | if (FD_ISSET(c->sock, readset)) { |
| 511 | addrlen = sizeof(addr); |
| 512 | newsock = accept(c->sock, &addr, &addrlen); |
| 513 | if (newsock < 0) { |
| 514 | error("accept from auth socket: %.100s", strerror(errno)); |
| 515 | return; |
| 516 | } |
| 517 | newch = channel_allocate(SSH_CHANNEL_OPENING, newsock, |
| 518 | xstrdup("accepted auth socket")); |
| 519 | packet_start(SSH_SMSG_AGENT_OPEN); |
| 520 | packet_put_int(newch); |
| 521 | packet_send(); |
| 522 | } |
| 523 | } |
| 524 | |
| 525 | int |
| 526 | channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset) |
| 527 | { |
| 528 | char buf[16*1024]; |
| 529 | int len; |
| 530 | |
| 531 | if (c->rfd != -1 && |
| 532 | FD_ISSET(c->rfd, readset)) { |
| 533 | len = read(c->rfd, buf, sizeof(buf)); |
| 534 | if (len <= 0) { |
| 535 | debug("channel %d: read<0 rfd %d len %d", |
| 536 | c->self, c->rfd, len); |
| 537 | if (compat13) { |
| 538 | buffer_consume(&c->output, buffer_len(&c->output)); |
| 539 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
| 540 | debug("Channel %d status set to input draining.", c->self); |
| 541 | } else { |
| 542 | chan_read_failed(c); |
| 543 | } |
| 544 | return -1; |
| 545 | } |
| 546 | buffer_append(&c->input, buf, len); |
| 547 | } |
| 548 | return 1; |
| 549 | } |
| 550 | int |
| 551 | channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset) |
| 552 | { |
| 553 | int len; |
| 554 | |
| 555 | /* Send buffered output data to the socket. */ |
| 556 | if (c->wfd != -1 && |
| 557 | FD_ISSET(c->wfd, writeset) && |
| 558 | buffer_len(&c->output) > 0) { |
| 559 | len = write(c->wfd, buffer_ptr(&c->output), |
| 560 | buffer_len(&c->output)); |
| 561 | if (len <= 0) { |
| 562 | if (compat13) { |
| 563 | buffer_consume(&c->output, buffer_len(&c->output)); |
| 564 | debug("Channel %d status set to input draining.", c->self); |
| 565 | c->type = SSH_CHANNEL_INPUT_DRAINING; |
| 566 | } else { |
| 567 | chan_write_failed(c); |
| 568 | } |
| 569 | return -1; |
| 570 | } |
| 571 | buffer_consume(&c->output, len); |
| 572 | } |
| 573 | return 1; |
| 574 | } |
| 575 | |
| 576 | void |
| 577 | channel_post_open_1(Channel *c, fd_set * readset, fd_set * writeset) |
| 578 | { |
| 579 | channel_handle_rfd(c, readset, writeset); |
| 580 | channel_handle_wfd(c, readset, writeset); |
| 581 | } |
| 582 | |
| 583 | void |
| 584 | channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset) |
| 585 | { |
| 586 | int len; |
| 587 | /* Send buffered output data to the socket. */ |
| 588 | if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) { |
| 589 | len = write(c->sock, buffer_ptr(&c->output), |
| 590 | buffer_len(&c->output)); |
| 591 | if (len <= 0) |
| 592 | buffer_consume(&c->output, buffer_len(&c->output)); |
| 593 | else |
| 594 | buffer_consume(&c->output, len); |
| 595 | } |
| 596 | } |
| 597 | |
| 598 | void |
| 599 | channel_handler_init_13(void) |
| 600 | { |
| 601 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13; |
| 602 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13; |
| 603 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
| 604 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
| 605 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
| 606 | channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining; |
| 607 | channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining; |
| 608 | |
| 609 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1; |
| 610 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
| 611 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
| 612 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
| 613 | channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13; |
| 614 | } |
| 615 | |
| 616 | void |
| 617 | channel_handler_init_15(void) |
| 618 | { |
| 619 | channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_15; |
| 620 | channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_15; |
| 621 | channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener; |
| 622 | channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener; |
| 623 | channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener; |
| 624 | |
| 625 | channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener; |
| 626 | channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener; |
| 627 | channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener; |
| 628 | channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1; |
| 629 | } |
| 630 | |
| 631 | void |
| 632 | channel_handler_init(void) |
| 633 | { |
| 634 | int i; |
| 635 | for(i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) { |
| 636 | channel_pre[i] = NULL; |
| 637 | channel_post[i] = NULL; |
| 638 | } |
| 639 | if (compat13) |
| 640 | channel_handler_init_13(); |
| 641 | else |
| 642 | channel_handler_init_15(); |
| 643 | } |
| 644 | |
| 645 | void |
| 646 | channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset) |
| 647 | { |
| 648 | static int did_init = 0; |
| 649 | int i; |
| 650 | Channel *c; |
| 651 | |
| 652 | if (!did_init) { |
| 653 | channel_handler_init(); |
| 654 | did_init = 1; |
| 655 | } |
| 656 | for (i = 0; i < channels_alloc; i++) { |
| 657 | c = &channels[i]; |
| 658 | if (c->type == SSH_CHANNEL_FREE) |
| 659 | continue; |
| 660 | if (ftab[c->type] == NULL) |
| 661 | continue; |
| 662 | (*ftab[c->type])(c, readset, writeset); |
| 663 | if (!compat13) |
| 664 | chan_delete_if_full_closed(c); |
| 665 | } |
| 666 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 667 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 668 | void |
| 669 | channel_prepare_select(fd_set * readset, fd_set * writeset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 670 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 671 | channel_handler(channel_pre, readset, writeset); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 672 | } |
| 673 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 674 | void |
| 675 | channel_after_select(fd_set * readset, fd_set * writeset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 676 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 677 | channel_handler(channel_post, readset, writeset); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 678 | } |
| 679 | |
| 680 | /* If there is data to send to the connection, send some of it now. */ |
| 681 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 682 | void |
| 683 | channel_output_poll() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 684 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 685 | int len, i; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 686 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 687 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 688 | for (i = 0; i < channels_alloc; i++) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 689 | c = &channels[i]; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 690 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 691 | /* We are only interested in channels that can have buffered incoming data. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 692 | if (compat13) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 693 | if (c->type != SSH_CHANNEL_OPEN && |
| 694 | c->type != SSH_CHANNEL_INPUT_DRAINING) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 695 | continue; |
| 696 | } else { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 697 | if (c->type != SSH_CHANNEL_OPEN) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 698 | continue; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 699 | if (c->istate != CHAN_INPUT_OPEN && |
| 700 | c->istate != CHAN_INPUT_WAIT_DRAIN) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 701 | continue; |
| 702 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 703 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 704 | /* Get the amount of buffered data for this channel. */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 705 | len = buffer_len(&c->input); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 706 | if (len > 0) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 707 | /* Send some data for the other side over the secure connection. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 708 | if (packet_is_interactive()) { |
| 709 | if (len > 1024) |
| 710 | len = 512; |
| 711 | } else { |
| 712 | /* Keep the packets at reasonable size. */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 713 | if (len > packet_get_maxsize()) |
Damien Miller | 68e45de | 1999-12-27 23:54:55 +1100 | [diff] [blame] | 714 | len = packet_get_maxsize()/2; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 715 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 716 | if (len > 0) { |
| 717 | packet_start(SSH_MSG_CHANNEL_DATA); |
| 718 | packet_put_int(c->remote_id); |
| 719 | packet_put_string(buffer_ptr(&c->input), len); |
| 720 | packet_send(); |
| 721 | buffer_consume(&c->input, len); |
| 722 | c->remote_window -= len; |
| 723 | debug("channel %d: send data len %d", c->self, len); |
| 724 | } |
| 725 | } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 726 | if (compat13) |
| 727 | fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3"); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 728 | /* |
| 729 | * input-buffer is empty and read-socket shutdown: |
| 730 | * tell peer, that we will not send more data: send IEOF |
| 731 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 732 | chan_ibuf_empty(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 733 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 734 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 735 | } |
| 736 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 737 | /* |
| 738 | * This is called when a packet of type CHANNEL_DATA has just been received. |
| 739 | * The message type has already been consumed, but channel number and data is |
| 740 | * still there. |
| 741 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 742 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 743 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 744 | channel_input_data(int type, int plen) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 745 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 746 | int id; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 747 | char *data; |
| 748 | unsigned int data_len; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 749 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 750 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 751 | /* Get the channel number and verify it. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 752 | id = packet_get_int(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 753 | c = channel_lookup(id); |
| 754 | if (c == NULL) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 755 | packet_disconnect("Received data for nonexistent channel %d.", id); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 756 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 757 | /* Ignore any data for non-open channels (might happen on close) */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 758 | if (c->type != SSH_CHANNEL_OPEN && |
| 759 | c->type != SSH_CHANNEL_X11_OPEN) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 760 | return; |
| 761 | |
| 762 | /* same for protocol 1.5 if output end is no longer open */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 763 | if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 764 | return; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 765 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 766 | /* Get the data. */ |
| 767 | data = packet_get_string(&data_len); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 768 | |
| 769 | packet_integrity_check(plen, 4 + 4 + data_len, SSH_MSG_CHANNEL_DATA); |
| 770 | buffer_append(&c->output, data, data_len); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 771 | xfree(data); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 772 | } |
| 773 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 774 | /* |
| 775 | * Returns true if no channel has too much buffered data, and false if one or |
| 776 | * more channel is overfull. |
| 777 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 778 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 779 | int |
| 780 | channel_not_very_much_buffered_data() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 781 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 782 | unsigned int i; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 783 | Channel *c; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 784 | |
| 785 | for (i = 0; i < channels_alloc; i++) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 786 | c = &channels[i]; |
| 787 | if (c->type == SSH_CHANNEL_OPEN) { |
| 788 | if (buffer_len(&c->input) > packet_get_maxsize()) { |
| 789 | debug("channel %d: big input buffer %d", |
| 790 | c->self, buffer_len(&c->input)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 791 | return 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 792 | } |
| 793 | if (buffer_len(&c->output) > packet_get_maxsize()) { |
| 794 | debug("channel %d: big output buffer %d", |
| 795 | c->self, buffer_len(&c->output)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 796 | return 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 797 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 798 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 799 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 800 | return 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 801 | } |
| 802 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 803 | void |
| 804 | channel_input_ieof(int type, int plen) |
| 805 | { |
| 806 | int id; |
| 807 | Channel *c; |
| 808 | |
| 809 | packet_integrity_check(plen, 4, type); |
| 810 | |
| 811 | id = packet_get_int(); |
| 812 | c = channel_lookup(id); |
| 813 | if (c == NULL) |
| 814 | packet_disconnect("Received ieof for nonexistent channel %d.", id); |
| 815 | chan_rcvd_ieof(c); |
| 816 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 817 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 818 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 819 | channel_input_close(int type, int plen) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 820 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 821 | int id; |
| 822 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 823 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 824 | packet_integrity_check(plen, 4, type); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 825 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 826 | id = packet_get_int(); |
| 827 | c = channel_lookup(id); |
| 828 | if (c == NULL) |
| 829 | packet_disconnect("Received close for nonexistent channel %d.", id); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 830 | |
| 831 | /* |
| 832 | * Send a confirmation that we have closed the channel and no more |
| 833 | * data is coming for it. |
| 834 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 835 | packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 836 | packet_put_int(c->remote_id); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 837 | packet_send(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 838 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 839 | /* |
| 840 | * If the channel is in closed state, we have sent a close request, |
| 841 | * and the other side will eventually respond with a confirmation. |
| 842 | * Thus, we cannot free the channel here, because then there would be |
| 843 | * no-one to receive the confirmation. The channel gets freed when |
| 844 | * the confirmation arrives. |
| 845 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 846 | if (c->type != SSH_CHANNEL_CLOSED) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 847 | /* |
| 848 | * Not a closed channel - mark it as draining, which will |
| 849 | * cause it to be freed later. |
| 850 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 851 | buffer_consume(&c->input, buffer_len(&c->input)); |
| 852 | c->type = SSH_CHANNEL_OUTPUT_DRAINING; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 853 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 854 | } |
| 855 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 856 | /* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 857 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 858 | channel_input_oclose(int type, int plen) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 859 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 860 | int id = packet_get_int(); |
| 861 | Channel *c = channel_lookup(id); |
| 862 | packet_integrity_check(plen, 4, type); |
| 863 | if (c == NULL) |
| 864 | packet_disconnect("Received oclose for nonexistent channel %d.", id); |
| 865 | chan_rcvd_oclose(c); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 866 | } |
| 867 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 868 | void |
| 869 | channel_input_close_confirmation(int type, int plen) |
| 870 | { |
| 871 | int id = packet_get_int(); |
| 872 | Channel *c = channel_lookup(id); |
| 873 | |
| 874 | if (c == NULL) |
| 875 | packet_disconnect("Received close confirmation for " |
| 876 | "out-of-range channel %d.", id); |
| 877 | if (c->type != SSH_CHANNEL_CLOSED) |
| 878 | packet_disconnect("Received close confirmation for " |
| 879 | "non-closed channel %d (type %d).", id, c->type); |
| 880 | channel_free(c->self); |
| 881 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 882 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 883 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 884 | channel_input_open_confirmation(int type, int plen) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 885 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 886 | int id, remote_id; |
| 887 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 888 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 889 | packet_integrity_check(plen, 4 + 4, type); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 890 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 891 | id = packet_get_int(); |
| 892 | c = channel_lookup(id); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 893 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 894 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
| 895 | packet_disconnect("Received open confirmation for " |
| 896 | "non-opening channel %d.", id); |
| 897 | remote_id = packet_get_int(); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 898 | /* 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] | 899 | c->remote_id = remote_id; |
| 900 | c->type = SSH_CHANNEL_OPEN; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 901 | } |
| 902 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 903 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 904 | channel_input_open_failure(int type, int plen) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 905 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 906 | int id; |
| 907 | Channel *c; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 908 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 909 | packet_integrity_check(plen, 4, type); |
| 910 | |
| 911 | id = packet_get_int(); |
| 912 | c = channel_lookup(id); |
| 913 | |
| 914 | if (c==NULL || c->type != SSH_CHANNEL_OPENING) |
| 915 | packet_disconnect("Received open failure for " |
| 916 | "non-opening channel %d.", id); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 917 | |
| 918 | /* Free the channel. This will also close the socket. */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 919 | channel_free(id); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 920 | } |
| 921 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 922 | /* |
| 923 | * Stops listening for channels, and removes any unix domain sockets that we |
| 924 | * might have. |
| 925 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 926 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 927 | void |
| 928 | channel_stop_listening() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 929 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 930 | int i; |
| 931 | for (i = 0; i < channels_alloc; i++) { |
| 932 | switch (channels[i].type) { |
| 933 | case SSH_CHANNEL_AUTH_SOCKET: |
| 934 | close(channels[i].sock); |
| 935 | remove(channels[i].path); |
| 936 | channel_free(i); |
| 937 | break; |
| 938 | case SSH_CHANNEL_PORT_LISTENER: |
| 939 | case SSH_CHANNEL_X11_LISTENER: |
| 940 | close(channels[i].sock); |
| 941 | channel_free(i); |
| 942 | break; |
| 943 | default: |
| 944 | break; |
| 945 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 946 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 947 | } |
| 948 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 949 | /* |
| 950 | * Closes the sockets of all channels. This is used to close extra file |
| 951 | * descriptors after a fork. |
| 952 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 953 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 954 | void |
| 955 | channel_close_all() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 956 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 957 | int i; |
| 958 | for (i = 0; i < channels_alloc; i++) { |
| 959 | if (channels[i].type != SSH_CHANNEL_FREE) |
| 960 | close(channels[i].sock); |
| 961 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 962 | } |
| 963 | |
| 964 | /* Returns the maximum file descriptor number used by the channels. */ |
| 965 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 966 | int |
| 967 | channel_max_fd() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 968 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 969 | return channel_max_fd_value; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 970 | } |
| 971 | |
| 972 | /* Returns true if any channel is still open. */ |
| 973 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 974 | int |
| 975 | channel_still_open() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 976 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 977 | unsigned int i; |
| 978 | for (i = 0; i < channels_alloc; i++) |
| 979 | switch (channels[i].type) { |
| 980 | case SSH_CHANNEL_FREE: |
| 981 | case SSH_CHANNEL_X11_LISTENER: |
| 982 | case SSH_CHANNEL_PORT_LISTENER: |
| 983 | case SSH_CHANNEL_CLOSED: |
| 984 | case SSH_CHANNEL_AUTH_SOCKET: |
| 985 | continue; |
| 986 | case SSH_CHANNEL_OPENING: |
| 987 | case SSH_CHANNEL_OPEN: |
| 988 | case SSH_CHANNEL_X11_OPEN: |
| 989 | return 1; |
| 990 | case SSH_CHANNEL_INPUT_DRAINING: |
| 991 | case SSH_CHANNEL_OUTPUT_DRAINING: |
| 992 | if (!compat13) |
| 993 | fatal("cannot happen: OUT_DRAIN"); |
| 994 | return 1; |
| 995 | default: |
| 996 | fatal("channel_still_open: bad channel type %d", channels[i].type); |
| 997 | /* NOTREACHED */ |
| 998 | } |
| 999 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1000 | } |
| 1001 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1002 | /* |
| 1003 | * Returns a message describing the currently open forwarded connections, |
| 1004 | * suitable for sending to the client. The message contains crlf pairs for |
| 1005 | * newlines. |
| 1006 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1007 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1008 | char * |
| 1009 | channel_open_message() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1010 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1011 | Buffer buffer; |
| 1012 | int i; |
| 1013 | char buf[512], *cp; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1014 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1015 | buffer_init(&buffer); |
| 1016 | snprintf(buf, sizeof buf, "The following connections are open:\r\n"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1017 | buffer_append(&buffer, buf, strlen(buf)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1018 | for (i = 0; i < channels_alloc; i++) { |
| 1019 | Channel *c = &channels[i]; |
| 1020 | switch (c->type) { |
| 1021 | case SSH_CHANNEL_FREE: |
| 1022 | case SSH_CHANNEL_X11_LISTENER: |
| 1023 | case SSH_CHANNEL_PORT_LISTENER: |
| 1024 | case SSH_CHANNEL_CLOSED: |
| 1025 | case SSH_CHANNEL_AUTH_SOCKET: |
| 1026 | continue; |
| 1027 | case SSH_CHANNEL_OPENING: |
| 1028 | case SSH_CHANNEL_OPEN: |
| 1029 | case SSH_CHANNEL_X11_OPEN: |
| 1030 | case SSH_CHANNEL_INPUT_DRAINING: |
| 1031 | case SSH_CHANNEL_OUTPUT_DRAINING: |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1032 | 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] | 1033 | c->self, c->remote_name, |
| 1034 | c->type, c->remote_id, |
| 1035 | c->istate, buffer_len(&c->input), |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1036 | c->ostate, buffer_len(&c->output), |
| 1037 | c->rfd, c->wfd); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1038 | buffer_append(&buffer, buf, strlen(buf)); |
| 1039 | continue; |
| 1040 | default: |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1041 | fatal("channel_open_message: bad channel type %d", c->type); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1042 | /* NOTREACHED */ |
| 1043 | } |
| 1044 | } |
| 1045 | buffer_append(&buffer, "\0", 1); |
| 1046 | cp = xstrdup(buffer_ptr(&buffer)); |
| 1047 | buffer_free(&buffer); |
| 1048 | return cp; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1049 | } |
| 1050 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1051 | /* |
| 1052 | * Initiate forwarding of connections to local port "port" through the secure |
| 1053 | * channel to host:port from remote side. |
| 1054 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1055 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1056 | void |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 1057 | channel_request_local_forwarding(u_short port, const char *host, |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 1058 | u_short host_port, int gateway_ports) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1059 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1060 | int success, ch, sock, on = 1; |
| 1061 | struct addrinfo hints, *ai, *aitop; |
| 1062 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1063 | struct linger linger; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1064 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1065 | if (strlen(host) > sizeof(channels[0].path) - 1) |
| 1066 | packet_disconnect("Forward host name too long."); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1067 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1068 | /* |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1069 | * getaddrinfo returns a loopback address if the hostname is |
| 1070 | * set to NULL and hints.ai_flags is not AI_PASSIVE |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1071 | */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1072 | memset(&hints, 0, sizeof(hints)); |
| 1073 | hints.ai_family = IPv4or6; |
| 1074 | hints.ai_flags = gateway_ports ? AI_PASSIVE : 0; |
| 1075 | hints.ai_socktype = SOCK_STREAM; |
| 1076 | snprintf(strport, sizeof strport, "%d", port); |
| 1077 | if (getaddrinfo(NULL, strport, &hints, &aitop) != 0) |
| 1078 | packet_disconnect("getaddrinfo: fatal error"); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1079 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1080 | success = 0; |
| 1081 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 1082 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 1083 | continue; |
| 1084 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
| 1085 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
| 1086 | error("channel_request_local_forwarding: getnameinfo failed"); |
| 1087 | continue; |
| 1088 | } |
| 1089 | /* Create a port to listen for the host. */ |
| 1090 | sock = socket(ai->ai_family, SOCK_STREAM, 0); |
| 1091 | if (sock < 0) { |
| 1092 | /* this is no error since kernel may not support ipv6 */ |
| 1093 | verbose("socket: %.100s", strerror(errno)); |
| 1094 | continue; |
| 1095 | } |
| 1096 | /* |
| 1097 | * Set socket options. We would like the socket to disappear |
| 1098 | * as soon as it has been closed for whatever reason. |
| 1099 | */ |
| 1100 | setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)); |
| 1101 | linger.l_onoff = 1; |
| 1102 | linger.l_linger = 5; |
| 1103 | setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger)); |
| 1104 | debug("Local forwarding listening on %s port %s.", ntop, strport); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1105 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1106 | /* Bind the socket to the address. */ |
| 1107 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
| 1108 | /* address can be in use ipv6 address is already bound */ |
Damien Miller | 3c7eeb2 | 2000-03-03 22:35:33 +1100 | [diff] [blame] | 1109 | if (!ai->ai_next) |
| 1110 | error("bind: %.100s", strerror(errno)); |
| 1111 | else |
| 1112 | verbose("bind: %.100s", strerror(errno)); |
| 1113 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1114 | close(sock); |
| 1115 | continue; |
| 1116 | } |
| 1117 | /* Start listening for connections on the socket. */ |
| 1118 | if (listen(sock, 5) < 0) { |
| 1119 | error("listen: %.100s", strerror(errno)); |
| 1120 | close(sock); |
| 1121 | continue; |
| 1122 | } |
| 1123 | /* Allocate a channel number for the socket. */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1124 | ch = channel_new( |
| 1125 | "port listener", SSH_CHANNEL_PORT_LISTENER, |
| 1126 | sock, sock, -1, |
| 1127 | CHAN_WINDOW_DEFAULT, CHAN_PACKET_DEFAULT, |
| 1128 | 0, xstrdup("port listener")); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1129 | strlcpy(channels[ch].path, host, sizeof(channels[ch].path)); |
| 1130 | channels[ch].host_port = host_port; |
| 1131 | channels[ch].listening_port = port; |
| 1132 | success = 1; |
| 1133 | } |
| 1134 | if (success == 0) |
| 1135 | packet_disconnect("cannot listen port: %d", port); |
| 1136 | freeaddrinfo(aitop); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1137 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1138 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1139 | /* |
| 1140 | * Initiate forwarding of connections to port "port" on remote host through |
| 1141 | * the secure channel to host:port from local side. |
| 1142 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1143 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1144 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1145 | channel_request_remote_forwarding(u_short listen_port, const char *host_to_connect, |
| 1146 | u_short port_to_connect) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1147 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1148 | int payload_len; |
| 1149 | /* Record locally that connection to this host/port is permitted. */ |
| 1150 | if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION) |
| 1151 | fatal("channel_request_remote_forwarding: too many forwards"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1152 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1153 | permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect); |
| 1154 | permitted_opens[num_permitted_opens].port_to_connect = port_to_connect; |
| 1155 | permitted_opens[num_permitted_opens].listen_port = listen_port; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1156 | num_permitted_opens++; |
| 1157 | |
| 1158 | /* Send the forward request to the remote side. */ |
| 1159 | packet_start(SSH_CMSG_PORT_FORWARD_REQUEST); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1160 | packet_put_int(port_to_connect); |
| 1161 | packet_put_string(host_to_connect, strlen(host_to_connect)); |
| 1162 | packet_put_int(listen_port); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1163 | packet_send(); |
| 1164 | packet_write_wait(); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1165 | /* |
| 1166 | * Wait for response from the remote side. It will send a disconnect |
| 1167 | * message on failure, and we will never see it here. |
| 1168 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1169 | packet_read_expect(&payload_len, SSH_SMSG_SUCCESS); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1170 | } |
| 1171 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1172 | /* |
| 1173 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates |
| 1174 | * listening for the port, and sends back a success reply (or disconnect |
| 1175 | * message if there was an error). This never returns if there was an error. |
| 1176 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1177 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1178 | void |
| 1179 | channel_input_port_forward_request(int is_root) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1180 | { |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 1181 | u_short port, host_port; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1182 | char *hostname; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1183 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1184 | /* Get arguments from the packet. */ |
| 1185 | port = packet_get_int(); |
| 1186 | hostname = packet_get_string(NULL); |
| 1187 | host_port = packet_get_int(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1188 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1189 | /* |
| 1190 | * Check that an unprivileged user is not trying to forward a |
| 1191 | * privileged port. |
| 1192 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1193 | if (port < IPPORT_RESERVED && !is_root) |
| 1194 | packet_disconnect("Requested forwarding of port %d but user is not root.", |
| 1195 | port); |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 1196 | /* |
| 1197 | * Initiate forwarding, |
| 1198 | * bind port to localhost only (gateway ports == 0). |
| 1199 | */ |
| 1200 | channel_request_local_forwarding(port, hostname, host_port, 0); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1201 | |
| 1202 | /* Free the argument string. */ |
| 1203 | xfree(hostname); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1204 | } |
| 1205 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1206 | /* XXX move to aux.c */ |
| 1207 | int |
| 1208 | channel_connect_to(const char *host, u_short host_port) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1209 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1210 | struct addrinfo hints, *ai, *aitop; |
| 1211 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
| 1212 | int gaierr; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1213 | int sock = -1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1214 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1215 | memset(&hints, 0, sizeof(hints)); |
| 1216 | hints.ai_family = IPv4or6; |
| 1217 | hints.ai_socktype = SOCK_STREAM; |
| 1218 | snprintf(strport, sizeof strport, "%d", host_port); |
| 1219 | if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) { |
| 1220 | error("%.100s: unknown host (%s)", host, gai_strerror(gaierr)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1221 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1222 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1223 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 1224 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 1225 | continue; |
| 1226 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop), |
| 1227 | strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1228 | error("channel_connect_to: getnameinfo failed"); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1229 | continue; |
| 1230 | } |
| 1231 | /* Create the socket. */ |
| 1232 | sock = socket(ai->ai_family, SOCK_STREAM, 0); |
| 1233 | if (sock < 0) { |
| 1234 | error("socket: %.100s", strerror(errno)); |
| 1235 | continue; |
| 1236 | } |
| 1237 | /* Connect to the host/port. */ |
| 1238 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
| 1239 | error("connect %.100s port %s: %.100s", ntop, strport, |
| 1240 | strerror(errno)); |
| 1241 | close(sock); |
| 1242 | continue; /* fail -- try next */ |
| 1243 | } |
| 1244 | break; /* success */ |
| 1245 | |
| 1246 | } |
| 1247 | freeaddrinfo(aitop); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1248 | if (!ai) { |
| 1249 | error("connect %.100s port %d: failed.", host, host_port); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1250 | return -1; |
| 1251 | } |
| 1252 | /* success */ |
| 1253 | return sock; |
| 1254 | } |
| 1255 | |
| 1256 | /* |
| 1257 | * This is called after receiving PORT_OPEN message. This attempts to |
| 1258 | * connect to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION |
| 1259 | * or CHANNEL_OPEN_FAILURE. |
| 1260 | */ |
| 1261 | |
| 1262 | void |
| 1263 | channel_input_port_open(int type, int plen) |
| 1264 | { |
| 1265 | u_short host_port; |
| 1266 | char *host, *originator_string; |
| 1267 | int remote_channel, sock = -1, newch, i, denied; |
| 1268 | unsigned int host_len, originator_len; |
| 1269 | |
| 1270 | /* Get remote channel number. */ |
| 1271 | remote_channel = packet_get_int(); |
| 1272 | |
| 1273 | /* Get host name to connect to. */ |
| 1274 | host = packet_get_string(&host_len); |
| 1275 | |
| 1276 | /* Get port to connect to. */ |
| 1277 | host_port = packet_get_int(); |
| 1278 | |
| 1279 | /* Get remote originator name. */ |
| 1280 | if (have_hostname_in_open) { |
| 1281 | originator_string = packet_get_string(&originator_len); |
| 1282 | originator_len += 4; /* size of packet_int */ |
| 1283 | } else { |
| 1284 | originator_string = xstrdup("unknown (remote did not supply name)"); |
| 1285 | originator_len = 0; /* no originator supplied */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1286 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1287 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1288 | packet_integrity_check(plen, |
| 1289 | 4 + 4 + host_len + 4 + originator_len, SSH_MSG_PORT_OPEN); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1290 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1291 | /* Check if opening that port is permitted. */ |
| 1292 | denied = 0; |
| 1293 | if (!all_opens_permitted) { |
| 1294 | /* Go trough all permitted ports. */ |
| 1295 | for (i = 0; i < num_permitted_opens; i++) |
| 1296 | if (permitted_opens[i].port_to_connect == host_port && |
| 1297 | strcmp(permitted_opens[i].host_to_connect, host) == 0) |
| 1298 | break; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1299 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1300 | /* Check if we found the requested port among those permitted. */ |
| 1301 | if (i >= num_permitted_opens) { |
| 1302 | /* The port is not permitted. */ |
| 1303 | log("Received request to connect to %.100s:%d, but the request was denied.", |
| 1304 | host, host_port); |
| 1305 | denied = 1; |
| 1306 | } |
| 1307 | } |
| 1308 | sock = denied ? -1 : channel_connect_to(host, host_port); |
| 1309 | if (sock > 0) { |
| 1310 | /* Allocate a channel for this connection. */ |
| 1311 | newch = channel_allocate(SSH_CHANNEL_OPEN, sock, originator_string); |
| 1312 | channels[newch].remote_id = remote_channel; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1313 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1314 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1315 | packet_put_int(remote_channel); |
| 1316 | packet_put_int(newch); |
| 1317 | packet_send(); |
| 1318 | } else { |
| 1319 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 1320 | packet_put_int(remote_channel); |
| 1321 | packet_send(); |
| 1322 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1323 | xfree(host); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1324 | } |
| 1325 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1326 | /* |
| 1327 | * Creates an internet domain socket for listening for X11 connections. |
| 1328 | * Returns a suitable value for the DISPLAY variable, or NULL if an error |
| 1329 | * occurs. |
| 1330 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1331 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1332 | #define NUM_SOCKS 10 |
| 1333 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1334 | char * |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 1335 | x11_create_display_inet(int screen_number, int x11_display_offset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1336 | { |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 1337 | int display_number, sock; |
| 1338 | u_short port; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1339 | struct addrinfo hints, *ai, *aitop; |
| 1340 | char strport[NI_MAXSERV]; |
| 1341 | int gaierr, n, num_socks = 0, socks[NUM_SOCKS]; |
| 1342 | char display[512]; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1343 | char hostname[MAXHOSTNAMELEN]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1344 | |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 1345 | for (display_number = x11_display_offset; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1346 | display_number < MAX_DISPLAYS; |
| 1347 | display_number++) { |
| 1348 | port = 6000 + display_number; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1349 | memset(&hints, 0, sizeof(hints)); |
| 1350 | hints.ai_family = IPv4or6; |
| 1351 | hints.ai_flags = AI_PASSIVE; /* XXX loopback only ? */ |
| 1352 | hints.ai_socktype = SOCK_STREAM; |
| 1353 | snprintf(strport, sizeof strport, "%d", port); |
| 1354 | if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) { |
| 1355 | error("getaddrinfo: %.100s", gai_strerror(gaierr)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1356 | return NULL; |
| 1357 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1358 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 1359 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 1360 | continue; |
| 1361 | sock = socket(ai->ai_family, SOCK_STREAM, 0); |
| 1362 | if (sock < 0) { |
Damien Miller | e219273 | 2000-01-17 13:22:55 +1100 | [diff] [blame] | 1363 | if (errno != EINVAL) { |
| 1364 | error("socket: %.100s", strerror(errno)); |
| 1365 | return NULL; |
| 1366 | } else { |
| 1367 | debug("Socket family %d not supported [X11 disp create]", ai->ai_family); |
| 1368 | continue; |
| 1369 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1370 | } |
| 1371 | if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
| 1372 | debug("bind port %d: %.100s", port, strerror(errno)); |
| 1373 | shutdown(sock, SHUT_RDWR); |
| 1374 | close(sock); |
Damien Miller | 3c7eeb2 | 2000-03-03 22:35:33 +1100 | [diff] [blame] | 1375 | |
| 1376 | if (ai->ai_next) |
| 1377 | continue; |
| 1378 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1379 | for (n = 0; n < num_socks; n++) { |
| 1380 | shutdown(socks[n], SHUT_RDWR); |
| 1381 | close(socks[n]); |
| 1382 | } |
| 1383 | num_socks = 0; |
| 1384 | break; |
| 1385 | } |
| 1386 | socks[num_socks++] = sock; |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 1387 | #ifndef DONT_TRY_OTHER_AF |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1388 | if (num_socks == NUM_SOCKS) |
| 1389 | break; |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 1390 | #else |
| 1391 | break; |
| 1392 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1393 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1394 | if (num_socks > 0) |
| 1395 | break; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1396 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1397 | if (display_number >= MAX_DISPLAYS) { |
| 1398 | error("Failed to allocate internet-domain X11 display socket."); |
| 1399 | return NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1400 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1401 | /* Start listening for connections on the socket. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1402 | for (n = 0; n < num_socks; n++) { |
| 1403 | sock = socks[n]; |
| 1404 | if (listen(sock, 5) < 0) { |
| 1405 | error("listen: %.100s", strerror(errno)); |
| 1406 | shutdown(sock, SHUT_RDWR); |
| 1407 | close(sock); |
| 1408 | return NULL; |
| 1409 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1410 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1411 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1412 | /* Set up a suitable value for the DISPLAY variable. */ |
Damien Miller | 76112de | 1999-12-21 11:18:08 +1100 | [diff] [blame] | 1413 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1414 | if (gethostname(hostname, sizeof(hostname)) < 0) |
| 1415 | fatal("gethostname: %.100s", strerror(errno)); |
Damien Miller | 76112de | 1999-12-21 11:18:08 +1100 | [diff] [blame] | 1416 | |
| 1417 | #ifdef IPADDR_IN_DISPLAY |
| 1418 | /* |
| 1419 | * HPUX detects the local hostname in the DISPLAY variable and tries |
| 1420 | * to set up a shared memory connection to the server, which it |
| 1421 | * incorrectly supposes to be local. |
| 1422 | * |
| 1423 | * The workaround - as used in later $$H and other programs - is |
| 1424 | * is to set display to the host's IP address. |
| 1425 | */ |
| 1426 | { |
| 1427 | struct hostent *he; |
| 1428 | struct in_addr my_addr; |
| 1429 | |
| 1430 | he = gethostbyname(hostname); |
| 1431 | if (he == NULL) { |
| 1432 | error("[X11-broken-fwd-hostname-workaround] Could not get " |
| 1433 | "IP address for hostname %s.", hostname); |
| 1434 | |
| 1435 | packet_send_debug("[X11-broken-fwd-hostname-workaround]" |
| 1436 | "Could not get IP address for hostname %s.", hostname); |
| 1437 | |
| 1438 | shutdown(sock, SHUT_RDWR); |
| 1439 | close(sock); |
| 1440 | |
| 1441 | return NULL; |
| 1442 | } |
| 1443 | |
| 1444 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); |
| 1445 | |
| 1446 | /* Set DISPLAY to <ip address>:screen.display */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1447 | snprintf(display, sizeof(display), "%.50s:%d.%d", inet_ntoa(my_addr), |
Damien Miller | 76112de | 1999-12-21 11:18:08 +1100 | [diff] [blame] | 1448 | display_number, screen_number); |
| 1449 | } |
| 1450 | #else /* IPADDR_IN_DISPLAY */ |
| 1451 | /* Just set DISPLAY to hostname:screen.display */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1452 | snprintf(display, sizeof display, "%.400s:%d.%d", hostname, |
Damien Miller | 76112de | 1999-12-21 11:18:08 +1100 | [diff] [blame] | 1453 | display_number, screen_number); |
| 1454 | #endif /* IPADDR_IN_DISPLAY */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1455 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1456 | /* Allocate a channel for each socket. */ |
| 1457 | for (n = 0; n < num_socks; n++) { |
| 1458 | sock = socks[n]; |
| 1459 | (void) channel_allocate(SSH_CHANNEL_X11_LISTENER, sock, |
| 1460 | xstrdup("X11 inet listener")); |
| 1461 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1462 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1463 | /* Return a suitable value for the DISPLAY environment variable. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1464 | return xstrdup(display); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1465 | } |
| 1466 | |
| 1467 | #ifndef X_UNIX_PATH |
| 1468 | #define X_UNIX_PATH "/tmp/.X11-unix/X" |
| 1469 | #endif |
| 1470 | |
| 1471 | static |
| 1472 | int |
Damien Miller | 81b25cf | 1999-12-07 16:47:28 +1100 | [diff] [blame] | 1473 | connect_local_xsocket(unsigned int dnr) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1474 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1475 | static const char *const x_sockets[] = { |
| 1476 | X_UNIX_PATH "%u", |
| 1477 | "/var/X/.X11-unix/X" "%u", |
| 1478 | "/usr/spool/sockets/X11/" "%u", |
| 1479 | NULL |
| 1480 | }; |
| 1481 | int sock; |
| 1482 | struct sockaddr_un addr; |
| 1483 | const char *const * path; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1484 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1485 | for (path = x_sockets; *path; ++path) { |
| 1486 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
| 1487 | if (sock < 0) |
| 1488 | error("socket: %.100s", strerror(errno)); |
| 1489 | memset(&addr, 0, sizeof(addr)); |
| 1490 | addr.sun_family = AF_UNIX; |
| 1491 | snprintf(addr.sun_path, sizeof addr.sun_path, *path, dnr); |
| 1492 | if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0) |
| 1493 | return sock; |
| 1494 | close(sock); |
| 1495 | } |
| 1496 | error("connect %.100s: %.100s", addr.sun_path, strerror(errno)); |
| 1497 | return -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1498 | } |
| 1499 | |
| 1500 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1501 | /* |
| 1502 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains |
| 1503 | * the remote channel number. We should do whatever we want, and respond |
| 1504 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. |
| 1505 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1506 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1507 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1508 | x11_input_open(int type, int plen) |
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 | int remote_channel, display_number, sock = 0, newch; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1511 | const char *display; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1512 | char buf[1024], *cp, *remote_host; |
Damien Miller | 7684ee1 | 2000-03-17 23:40:15 +1100 | [diff] [blame] | 1513 | unsigned int remote_len; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1514 | struct addrinfo hints, *ai, *aitop; |
| 1515 | char strport[NI_MAXSERV]; |
| 1516 | int gaierr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1517 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1518 | /* Get remote channel number. */ |
| 1519 | remote_channel = packet_get_int(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1520 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1521 | /* Get remote originator name. */ |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1522 | if (have_hostname_in_open) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1523 | remote_host = packet_get_string(&remote_len); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1524 | remote_len += 4; |
| 1525 | } else { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1526 | remote_host = xstrdup("unknown (remote did not supply name)"); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1527 | remote_len = 0; |
| 1528 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1529 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1530 | debug("Received X11 open request."); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1531 | packet_integrity_check(plen, 4 + remote_len, SSH_SMSG_X11_OPEN); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1532 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1533 | /* Try to open a socket for the local X server. */ |
| 1534 | display = getenv("DISPLAY"); |
| 1535 | if (!display) { |
| 1536 | error("DISPLAY not set."); |
| 1537 | goto fail; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1538 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1539 | /* |
| 1540 | * Now we decode the value of the DISPLAY variable and make a |
| 1541 | * connection to the real X server. |
| 1542 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1543 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1544 | /* |
| 1545 | * Check if it is a unix domain socket. Unix domain displays are in |
| 1546 | * one of the following formats: unix:d[.s], :d[.s], ::d[.s] |
| 1547 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1548 | if (strncmp(display, "unix:", 5) == 0 || |
| 1549 | display[0] == ':') { |
| 1550 | /* Connect to the unix domain socket. */ |
| 1551 | if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) { |
| 1552 | error("Could not parse display number from DISPLAY: %.100s", |
| 1553 | display); |
| 1554 | goto fail; |
| 1555 | } |
| 1556 | /* Create a socket. */ |
| 1557 | sock = connect_local_xsocket(display_number); |
| 1558 | if (sock < 0) |
| 1559 | goto fail; |
| 1560 | |
| 1561 | /* OK, we now have a connection to the display. */ |
| 1562 | goto success; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1563 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1564 | /* |
| 1565 | * Connect to an inet socket. The DISPLAY value is supposedly |
| 1566 | * hostname:d[.s], where hostname may also be numeric IP address. |
| 1567 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1568 | strncpy(buf, display, sizeof(buf)); |
| 1569 | buf[sizeof(buf) - 1] = 0; |
| 1570 | cp = strchr(buf, ':'); |
| 1571 | if (!cp) { |
| 1572 | error("Could not find ':' in DISPLAY: %.100s", display); |
| 1573 | goto fail; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1574 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1575 | *cp = 0; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1576 | /* 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] | 1577 | if (sscanf(cp + 1, "%d", &display_number) != 1) { |
| 1578 | error("Could not parse display number from DISPLAY: %.100s", |
| 1579 | display); |
| 1580 | goto fail; |
| 1581 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1582 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1583 | /* Look up the host address */ |
| 1584 | memset(&hints, 0, sizeof(hints)); |
| 1585 | hints.ai_family = IPv4or6; |
| 1586 | hints.ai_socktype = SOCK_STREAM; |
| 1587 | snprintf(strport, sizeof strport, "%d", 6000 + display_number); |
| 1588 | if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) { |
| 1589 | error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1590 | goto fail; |
| 1591 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1592 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 1593 | /* Create a socket. */ |
| 1594 | sock = socket(ai->ai_family, SOCK_STREAM, 0); |
| 1595 | if (sock < 0) { |
| 1596 | debug("socket: %.100s", strerror(errno)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1597 | continue; |
| 1598 | } |
| 1599 | /* Connect it to the display. */ |
| 1600 | if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) { |
| 1601 | debug("connect %.100s port %d: %.100s", buf, |
| 1602 | 6000 + display_number, strerror(errno)); |
| 1603 | close(sock); |
| 1604 | continue; |
| 1605 | } |
| 1606 | /* Success */ |
| 1607 | break; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1608 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 1609 | freeaddrinfo(aitop); |
| 1610 | if (!ai) { |
| 1611 | error("connect %.100s port %d: %.100s", buf, 6000 + display_number, |
| 1612 | strerror(errno)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1613 | goto fail; |
| 1614 | } |
| 1615 | success: |
| 1616 | /* We have successfully obtained a connection to the real X display. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1617 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1618 | /* Allocate a channel for this connection. */ |
| 1619 | if (x11_saved_proto == NULL) |
| 1620 | newch = channel_allocate(SSH_CHANNEL_OPEN, sock, remote_host); |
| 1621 | else |
| 1622 | newch = channel_allocate(SSH_CHANNEL_X11_OPEN, sock, remote_host); |
| 1623 | channels[newch].remote_id = remote_channel; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1624 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1625 | /* Send a confirmation to the remote host. */ |
| 1626 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1627 | packet_put_int(remote_channel); |
| 1628 | packet_put_int(newch); |
| 1629 | packet_send(); |
| 1630 | |
| 1631 | return; |
| 1632 | |
| 1633 | fail: |
| 1634 | /* Send refusal to the remote host. */ |
| 1635 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 1636 | packet_put_int(remote_channel); |
| 1637 | packet_send(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1638 | } |
| 1639 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1640 | /* |
| 1641 | * Requests forwarding of X11 connections, generates fake authentication |
| 1642 | * data, and enables authentication spoofing. |
| 1643 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1644 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1645 | void |
| 1646 | x11_request_forwarding_with_spoofing(const char *proto, const char *data) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1647 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1648 | unsigned int data_len = (unsigned int) strlen(data) / 2; |
| 1649 | unsigned int i, value; |
| 1650 | char *new_data; |
| 1651 | int screen_number; |
| 1652 | const char *cp; |
| 1653 | u_int32_t rand = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1654 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1655 | cp = getenv("DISPLAY"); |
| 1656 | if (cp) |
| 1657 | cp = strchr(cp, ':'); |
| 1658 | if (cp) |
| 1659 | cp = strchr(cp, '.'); |
| 1660 | if (cp) |
| 1661 | screen_number = atoi(cp + 1); |
| 1662 | else |
| 1663 | screen_number = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1664 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1665 | /* Save protocol name. */ |
| 1666 | x11_saved_proto = xstrdup(proto); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1667 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1668 | /* |
| 1669 | * Extract real authentication data and generate fake data of the |
| 1670 | * same length. |
| 1671 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1672 | x11_saved_data = xmalloc(data_len); |
| 1673 | x11_fake_data = xmalloc(data_len); |
| 1674 | for (i = 0; i < data_len; i++) { |
| 1675 | if (sscanf(data + 2 * i, "%2x", &value) != 1) |
| 1676 | fatal("x11_request_forwarding: bad authentication data: %.100s", data); |
| 1677 | if (i % 4 == 0) |
| 1678 | rand = arc4random(); |
| 1679 | x11_saved_data[i] = value; |
| 1680 | x11_fake_data[i] = rand & 0xff; |
| 1681 | rand >>= 8; |
| 1682 | } |
| 1683 | x11_saved_data_len = data_len; |
| 1684 | x11_fake_data_len = data_len; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1685 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1686 | /* Convert the fake data into hex. */ |
| 1687 | new_data = xmalloc(2 * data_len + 1); |
| 1688 | for (i = 0; i < data_len; i++) |
| 1689 | sprintf(new_data + 2 * i, "%02x", (unsigned char) x11_fake_data[i]); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1690 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1691 | /* Send the request packet. */ |
| 1692 | packet_start(SSH_CMSG_X11_REQUEST_FORWARDING); |
| 1693 | packet_put_string(proto, strlen(proto)); |
| 1694 | packet_put_string(new_data, strlen(new_data)); |
| 1695 | packet_put_int(screen_number); |
| 1696 | packet_send(); |
| 1697 | packet_write_wait(); |
| 1698 | xfree(new_data); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1699 | } |
| 1700 | |
| 1701 | /* Sends a message to the server to request authentication fd forwarding. */ |
| 1702 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1703 | void |
| 1704 | auth_request_forwarding() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1705 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1706 | packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING); |
| 1707 | packet_send(); |
| 1708 | packet_write_wait(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1709 | } |
| 1710 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1711 | /* |
| 1712 | * Returns the name of the forwarded authentication socket. Returns NULL if |
| 1713 | * there is no forwarded authentication socket. The returned value points to |
| 1714 | * a static buffer. |
| 1715 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1716 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1717 | char * |
| 1718 | auth_get_socket_name() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1719 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1720 | return channel_forwarded_auth_socket_name; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1721 | } |
| 1722 | |
| 1723 | /* removes the agent forwarding socket */ |
| 1724 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1725 | void |
| 1726 | cleanup_socket(void) |
| 1727 | { |
| 1728 | remove(channel_forwarded_auth_socket_name); |
| 1729 | rmdir(channel_forwarded_auth_socket_dir); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1730 | } |
| 1731 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1732 | /* |
| 1733 | * This if called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server. |
| 1734 | * This starts forwarding authentication requests. |
| 1735 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1736 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1737 | void |
| 1738 | auth_input_request_forwarding(struct passwd * pw) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1739 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1740 | int sock, newch; |
| 1741 | struct sockaddr_un sunaddr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1742 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1743 | if (auth_get_socket_name() != NULL) |
| 1744 | fatal("Protocol error: authentication forwarding requested twice."); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1745 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1746 | /* Temporarily drop privileged uid for mkdir/bind. */ |
| 1747 | temporarily_use_uid(pw->pw_uid); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1748 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1749 | /* Allocate a buffer for the socket name, and format the name. */ |
| 1750 | channel_forwarded_auth_socket_name = xmalloc(MAX_SOCKET_NAME); |
| 1751 | channel_forwarded_auth_socket_dir = xmalloc(MAX_SOCKET_NAME); |
| 1752 | strlcpy(channel_forwarded_auth_socket_dir, "/tmp/ssh-XXXXXXXX", MAX_SOCKET_NAME); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1753 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1754 | /* Create private directory for socket */ |
| 1755 | if (mkdtemp(channel_forwarded_auth_socket_dir) == NULL) |
| 1756 | packet_disconnect("mkdtemp: %.100s", strerror(errno)); |
| 1757 | snprintf(channel_forwarded_auth_socket_name, MAX_SOCKET_NAME, "%s/agent.%d", |
| 1758 | channel_forwarded_auth_socket_dir, (int) getpid()); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1759 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1760 | if (atexit(cleanup_socket) < 0) { |
| 1761 | int saved = errno; |
| 1762 | cleanup_socket(); |
| 1763 | packet_disconnect("socket: %.100s", strerror(saved)); |
| 1764 | } |
| 1765 | /* Create the socket. */ |
| 1766 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
| 1767 | if (sock < 0) |
| 1768 | packet_disconnect("socket: %.100s", strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1769 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1770 | /* Bind it to the name. */ |
| 1771 | memset(&sunaddr, 0, sizeof(sunaddr)); |
| 1772 | sunaddr.sun_family = AF_UNIX; |
| 1773 | strncpy(sunaddr.sun_path, channel_forwarded_auth_socket_name, |
| 1774 | sizeof(sunaddr.sun_path)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1775 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1776 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) |
| 1777 | packet_disconnect("bind: %.100s", strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1778 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1779 | /* Restore the privileged uid. */ |
| 1780 | restore_uid(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1781 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1782 | /* Start listening on the socket. */ |
| 1783 | if (listen(sock, 5) < 0) |
| 1784 | packet_disconnect("listen: %.100s", strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1785 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1786 | /* Allocate a channel for the authentication agent socket. */ |
| 1787 | newch = channel_allocate(SSH_CHANNEL_AUTH_SOCKET, sock, |
| 1788 | xstrdup("auth socket")); |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 1789 | strlcpy(channels[newch].path, channel_forwarded_auth_socket_name, |
| 1790 | sizeof(channels[newch].path)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1791 | } |
| 1792 | |
| 1793 | /* This is called to process an SSH_SMSG_AGENT_OPEN message. */ |
| 1794 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1795 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1796 | auth_input_open_request(int type, int plen) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1797 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1798 | int remch, sock, newch; |
| 1799 | char *dummyname; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1800 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1801 | packet_integrity_check(plen, 4, type); |
| 1802 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1803 | /* Read the remote channel number from the message. */ |
| 1804 | remch = packet_get_int(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1805 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1806 | /* |
| 1807 | * Get a connection to the local authentication agent (this may again |
| 1808 | * get forwarded). |
| 1809 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1810 | sock = ssh_get_authentication_socket(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1811 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1812 | /* |
| 1813 | * If we could not connect the agent, send an error message back to |
| 1814 | * the server. This should never happen unless the agent dies, |
| 1815 | * because authentication forwarding is only enabled if we have an |
| 1816 | * agent. |
| 1817 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1818 | if (sock < 0) { |
| 1819 | packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE); |
| 1820 | packet_put_int(remch); |
| 1821 | packet_send(); |
| 1822 | return; |
| 1823 | } |
| 1824 | debug("Forwarding authentication connection."); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1825 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1826 | /* |
| 1827 | * Dummy host name. This will be freed when the channel is freed; it |
| 1828 | * will still be valid in the packet_put_string below since the |
| 1829 | * channel cannot yet be freed at that point. |
| 1830 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1831 | dummyname = xstrdup("authentication agent connection"); |
| 1832 | |
| 1833 | newch = channel_allocate(SSH_CHANNEL_OPEN, sock, dummyname); |
| 1834 | channels[newch].remote_id = remch; |
| 1835 | |
| 1836 | /* Send a confirmation to the remote host. */ |
| 1837 | packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION); |
| 1838 | packet_put_int(remch); |
| 1839 | packet_put_int(newch); |
| 1840 | packet_send(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1841 | } |